openwrt-xburst/target/linux/generic/patches-2.6.36/511-yaffs-git-2010-10-01.patch

--- a/fs/yaffs2/devextras.h
+++ b/fs/yaffs2/devextras.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -24,6 +24,8 @@
 #define __EXTRAS_H__
 
 
+#include "yportenv.h"
+
 #if !(defined __KERNEL__)
 
 /* Definition of types */
@@ -33,103 +35,6 @@ typedef unsigned __u32;
 
 #endif
 
-/*
- * This is a simple doubly linked list implementation that matches the
- * way the Linux kernel doubly linked list implementation works.
- */
-
-struct ylist_head {
-	struct ylist_head *next; /* next in chain */
-	struct ylist_head *prev; /* previous in chain */
-};
-
-
-/* Initialise a static list */
-#define YLIST_HEAD(name) \
-struct ylist_head name = { &(name), &(name)}
-
-
-
-/* Initialise a list head to an empty list */
-#define YINIT_LIST_HEAD(p) \
-do { \
-	(p)->next = (p);\
-	(p)->prev = (p); \
-} while (0)
-
-
-/* Add an element to a list */
-static __inline__ void ylist_add(struct ylist_head *newEntry,
-				struct ylist_head *list)
-{
-	struct ylist_head *listNext = list->next;
-
-	list->next = newEntry;
-	newEntry->prev = list;
-	newEntry->next = listNext;
-	listNext->prev = newEntry;
-
-}
-
-static __inline__ void ylist_add_tail(struct ylist_head *newEntry,
-				 struct ylist_head *list)
-{
-	struct ylist_head *listPrev = list->prev;
-
-	list->prev = newEntry;
-	newEntry->next = list;
-	newEntry->prev = listPrev;
-	listPrev->next = newEntry;
-
-}
-
-
-/* Take an element out of its current list, with or without
- * reinitialising the links.of the entry*/
-static __inline__ void ylist_del(struct ylist_head *entry)
-{
-	struct ylist_head *listNext = entry->next;
-	struct ylist_head *listPrev = entry->prev;
-
-	listNext->prev = listPrev;
-	listPrev->next = listNext;
-
-}
-
-static __inline__ void ylist_del_init(struct ylist_head *entry)
-{
-	ylist_del(entry);
-	entry->next = entry->prev = entry;
-}
-
-
-/* Test if the list is empty */
-static __inline__ int ylist_empty(struct ylist_head *entry)
-{
-	return (entry->next == entry);
-}
-
-
-/* ylist_entry takes a pointer to a list entry and offsets it to that
- * we can find a pointer to the object it is embedded in.
- */
-
-
-#define ylist_entry(entry, type, member) \
-	((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
-
-
-/* ylist_for_each and list_for_each_safe  iterate over lists.
- * ylist_for_each_safe uses temporary storage to make the list delete safe
- */
-
-#define ylist_for_each(itervar, list) \
-	for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
-
-#define ylist_for_each_safe(itervar, saveVar, list) \
-	for (itervar = (list)->next, saveVar = (list)->next->next; \
-		itervar != (list); itervar = saveVar, saveVar = saveVar->next)
-
 
 #if !(defined __KERNEL__)
 
--- a/fs/yaffs2/Kconfig
+++ b/fs/yaffs2/Kconfig
@@ -90,23 +90,15 @@ config YAFFS_AUTO_YAFFS2
 
 	  If unsure, say Y.
 
-config YAFFS_DISABLE_LAZY_LOAD
-	bool "Disable lazy loading"
-	depends on YAFFS_YAFFS2
+config YAFFS_DISABLE_TAGS_ECC
+	bool "Disable YAFFS from doing ECC on tags by default"
+	depends on YAFFS_FS && YAFFS_YAFFS2
 	default n
 	help
-	  "Lazy loading" defers loading file details until they are
-	  required. This saves mount time, but makes the first look-up
-	  a bit longer.
-
-	  Lazy loading will only happen if enabled by this option being 'n'
-	  and if the appropriate tags are available, else yaffs2 will
-	  automatically fall back to immediate loading and do the right
-	  thing.
-
-	  Lazy laoding will be required by checkpointing.
-
-	  Setting this to 'y' will disable lazy loading.
+	  This defaults Yaffs to using its own ECC calculations on tags instead of
+	  just relying on the MTD.
+	  This behavior can also be overridden with tags_ecc_on and
+	  tags_ecc_off mount options.
 
 	  If unsure, say N.
 
@@ -154,3 +146,45 @@ config YAFFS_SHORT_NAMES_IN_RAM
 	  but makes look-ups faster.
 
 	  If unsure, say Y.
+
+config YAFFS_EMPTY_LOST_AND_FOUND
+	bool "Empty lost and found on boot"
+	depends on YAFFS_FS
+	default n
+	help
+	  If this is enabled then the contents of lost and found is
+	  automatically dumped at mount.
+
+	  If unsure, say N.
+
+config YAFFS_DISABLE_BLOCK_REFRESHING
+	bool "Disable yaffs2 block refreshing"
+	depends on YAFFS_FS
+	default n
+	help
+	 If this is set, then block refreshing is disabled.
+	 Block refreshing infrequently refreshes the oldest block in
+	 a yaffs2 file system. This mechanism helps to refresh flash to
+	 mitigate against data loss. This is particularly useful for MLC.
+
+	  If unsure, say N.
+
+config YAFFS_DISABLE_BACKGROUND
+	bool "Disable yaffs2 background processing"
+	depends on YAFFS_FS
+	default n
+	help
+	 If this is set, then background processing is disabled.
+	 Background processing makes many foreground activities faster.
+
+	  If unsure, say N.
+
+config YAFFS_XATTR
+	bool "Enable yaffs2 xattr support"
+	depends on YAFFS_FS
+	default y
+	help
+	 If this is set then yaffs2 will provide xattr support.
+	 If unsure, say Y.
+
+
--- a/fs/yaffs2/Makefile
+++ b/fs/yaffs2/Makefile
@@ -4,7 +4,14 @@
 
 obj-$(CONFIG_YAFFS_FS) += yaffs.o
 
-yaffs-y := yaffs_ecc.o yaffs_fs.o yaffs_guts.o yaffs_checkptrw.o
-yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o yaffs_qsort.o
+yaffs-y := yaffs_ecc.o yaffs_vfs_glue.o yaffs_guts.o yaffs_checkptrw.o
+yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o
 yaffs-y += yaffs_tagscompat.o yaffs_tagsvalidity.o
 yaffs-y += yaffs_mtdif.o yaffs_mtdif1.o yaffs_mtdif2.o
+yaffs-y += yaffs_nameval.o
+yaffs-y += yaffs_allocator.o
+yaffs-y += yaffs_yaffs1.o
+yaffs-y += yaffs_yaffs2.o
+yaffs-y += yaffs_bitmap.o
+yaffs-y += yaffs_verify.o
+
--- a/fs/yaffs2/moduleconfig.h
+++ b/fs/yaffs2/moduleconfig.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Martin Fouts <Martin.Fouts@palmsource.com>
@@ -29,22 +29,43 @@
 /* Meaning: Yaffs does its own ECC, rather than using MTD ECC */
 /* #define CONFIG_YAFFS_DOES_ECC */
 
+/* Default: Selected */
+/* Meaning: Yaffs does its own ECC on tags for packed tags rather than use mtd */
+#define CONFIG_YAFFS_DOES_TAGS_ECC
+
 /* Default: Not selected */
 /* Meaning: ECC byte order is 'wrong'.  Only meaningful if */
 /*          CONFIG_YAFFS_DOES_ECC is set */
 /* #define CONFIG_YAFFS_ECC_WRONG_ORDER */
 
-/* Default: Selected */
-/* Meaning: Disables testing whether chunks are erased before writing to them*/
-#define CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
+/* Default: Not selected */
+/* Meaning: Always test whether chunks are erased before writing to them.
+	    Use during mtd debugging and init. */
+/* #define CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED */
+
+/* Default: Not Selected */
+/* Meaning: At mount automatically empty all files from lost and found. */
+/* This is done to fix an old problem where rmdir was not checking for an */
+/* empty directory. This can also be achieved with a mount option. */
+#define CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
 
 /* Default: Selected */
 /* Meaning: Cache short names, taking more RAM, but faster look-ups */
 #define CONFIG_YAFFS_SHORT_NAMES_IN_RAM
 
-/* Default: 10 */
-/* Meaning: set the count of blocks to reserve for checkpointing */
-#define CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS 10
+/* Default: Unselected */
+/* Meaning: Select to disable block refreshing. */
+/* Block Refreshing periodically rewrites the oldest block. */
+/* #define CONFIG_DISABLE_BLOCK_REFRESHING */
+
+/* Default: Unselected */
+/* Meaning: Select to disable background processing */
+/* #define CONFIG_DISABLE_BACKGROUND */
+
+
+/* Default: Selected */
+/* Meaning: Enable XATTR support */
+#define CONFIG_YAFFS_XATTR
 
 /*
 Older-style on-NAND data format has a "pageStatus" byte to record
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.c
@@ -0,0 +1,409 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+
+#ifdef CONFIG_YAFFS_YMALLOC_ALLOCATOR
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	dev = dev;
+}
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	dev = dev;
+}
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+	return (yaffs_Tnode *)YMALLOC(dev->tnodeSize);
+}
+
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+	dev = dev;
+	YFREE(tn);
+}
+
+void yaffs_InitialiseRawObjects(yaffs_Device *dev)
+{
+	dev = dev;
+}
+
+void yaffs_DeinitialiseRawObjects(yaffs_Device *dev)
+{
+	dev = dev;
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+	dev = dev;
+	return (yaffs_Object *) YMALLOC(sizeof(yaffs_Object));
+}
+
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+
+	dev = dev;
+	YFREE(obj);
+}
+
+#else
+
+struct yaffs_TnodeList_struct {
+	struct yaffs_TnodeList_struct *next;
+	yaffs_Tnode *tnodes;
+};
+
+typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
+
+struct yaffs_ObjectList_struct {
+	yaffs_Object *objects;
+	struct yaffs_ObjectList_struct *next;
+};
+
+typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
+
+
+struct yaffs_AllocatorStruct {
+	int nTnodesCreated;
+	yaffs_Tnode *freeTnodes;
+	int nFreeTnodes;
+	yaffs_TnodeList *allocatedTnodeList;
+
+	int nObjectsCreated;
+	yaffs_Object *freeObjects;
+	int nFreeObjects;
+
+	yaffs_ObjectList *allocatedObjectList;
+};
+
+typedef struct yaffs_AllocatorStruct yaffs_Allocator;
+
+
+static void yaffs_DeinitialiseRawTnodes(yaffs_Device *dev)
+{
+
+	yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+
+	yaffs_TnodeList *tmp;
+
+	if(!allocator){
+		YBUG();
+		return;
+	}
+
+	while (allocator->allocatedTnodeList) {
+		tmp = allocator->allocatedTnodeList->next;
+
+		YFREE(allocator->allocatedTnodeList->tnodes);
+		YFREE(allocator->allocatedTnodeList);
+		allocator->allocatedTnodeList = tmp;
+
+	}
+
+	allocator->freeTnodes = NULL;
+	allocator->nFreeTnodes = 0;
+	allocator->nTnodesCreated = 0;
+}
+
+static void yaffs_InitialiseRawTnodes(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(allocator){
+		allocator->allocatedTnodeList = NULL;
+		allocator->freeTnodes = NULL;
+		allocator->nFreeTnodes = 0;
+		allocator->nTnodesCreated = 0;
+	} else
+		YBUG();
+}
+
+static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
+{
+	yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+	int i;
+	yaffs_Tnode *newTnodes;
+	__u8 *mem;
+	yaffs_Tnode *curr;
+	yaffs_Tnode *next;
+	yaffs_TnodeList *tnl;
+
+	if(!allocator){
+		YBUG();
+		return YAFFS_FAIL;
+	}
+
+	if (nTnodes < 1)
+		return YAFFS_OK;
+
+
+	/* make these things */
+
+	newTnodes = YMALLOC(nTnodes * dev->tnodeSize);
+	mem = (__u8 *)newTnodes;
+
+	if (!newTnodes) {
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* New hookup for wide tnodes */
+	for (i = 0; i < nTnodes - 1; i++) {
+		curr = (yaffs_Tnode *) &mem[i * dev->tnodeSize];
+		next = (yaffs_Tnode *) &mem[(i+1) * dev->tnodeSize];
+		curr->internal[0] = next;
+	}
+
+	curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * dev->tnodeSize];
+	curr->internal[0] = allocator->freeTnodes;
+	allocator->freeTnodes = (yaffs_Tnode *)mem;
+
+	allocator->nFreeTnodes += nTnodes;
+	allocator->nTnodesCreated += nTnodes;
+
+	/* Now add this bunch of tnodes to a list for freeing up.
+	 * NB If we can't add this to the management list it isn't fatal
+	 * but it just means we can't free this bunch of tnodes later.
+	 */
+
+	tnl = YMALLOC(sizeof(yaffs_TnodeList));
+	if (!tnl) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR
+		   ("yaffs: Could not add tnodes to management list" TENDSTR)));
+		   return YAFFS_FAIL;
+	} else {
+		tnl->tnodes = newTnodes;
+		tnl->next = allocator->allocatedTnodeList;
+		allocator->allocatedTnodeList = tnl;
+	}
+
+	T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
+
+	return YAFFS_OK;
+}
+
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+	yaffs_Tnode *tn = NULL;
+
+	if(!allocator){
+		YBUG();
+		return NULL;
+	}
+
+	/* If there are none left make more */
+	if (!allocator->freeTnodes)
+		yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
+
+	if (allocator->freeTnodes) {
+		tn = allocator->freeTnodes;
+		allocator->freeTnodes = allocator->freeTnodes->internal[0];
+		allocator->nFreeTnodes--;
+	}
+
+	return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(!allocator){
+		YBUG();
+		return;
+	}
+
+	if (tn) {
+		tn->internal[0] = allocator->freeTnodes;
+		allocator->freeTnodes = tn;
+		allocator->nFreeTnodes++;
+	}
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+}
+
+
+
+static void yaffs_InitialiseRawObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(allocator) {
+		allocator->allocatedObjectList = NULL;
+		allocator->freeObjects = NULL;
+		allocator->nFreeObjects = 0;
+	} else
+		YBUG();
+}
+
+static void yaffs_DeinitialiseRawObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	yaffs_ObjectList *tmp;
+
+	if(!allocator){
+		YBUG();
+		return;
+	}
+
+	while (allocator->allocatedObjectList) {
+		tmp = allocator->allocatedObjectList->next;
+		YFREE(allocator->allocatedObjectList->objects);
+		YFREE(allocator->allocatedObjectList);
+
+		allocator->allocatedObjectList = tmp;
+	}
+
+	allocator->freeObjects = NULL;
+	allocator->nFreeObjects = 0;
+	allocator->nObjectsCreated = 0;
+}
+
+
+static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+
+	int i;
+	yaffs_Object *newObjects;
+	yaffs_ObjectList *list;
+
+	if(!allocator){
+		YBUG();
+		return YAFFS_FAIL;
+	}
+
+	if (nObjects < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+	list = YMALLOC(sizeof(yaffs_ObjectList));
+
+	if (!newObjects || !list) {
+		if (newObjects){
+			YFREE(newObjects);
+			newObjects = NULL;
+		}
+		if (list){
+			YFREE(list);
+			list = NULL;
+		}
+		T(YAFFS_TRACE_ALLOCATE,
+		  (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Hook them into the free list */
+	for (i = 0; i < nObjects - 1; i++) {
+		newObjects[i].siblings.next =
+				(struct ylist_head *)(&newObjects[i + 1]);
+	}
+
+	newObjects[nObjects - 1].siblings.next = (void *)allocator->freeObjects;
+	allocator->freeObjects = newObjects;
+	allocator->nFreeObjects += nObjects;
+	allocator->nObjectsCreated += nObjects;
+
+	/* Now add this bunch of Objects to a list for freeing up. */
+
+	list->objects = newObjects;
+	list->next = allocator->allocatedObjectList;
+	allocator->allocatedObjectList = list;
+
+	return YAFFS_OK;
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+	yaffs_Object *obj = NULL;
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(!allocator) {
+		YBUG();
+		return obj;
+	}
+
+	/* If there are none left make more */
+	if (!allocator->freeObjects)
+		yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
+
+	if (allocator->freeObjects) {
+		obj = allocator->freeObjects;
+		allocator->freeObjects =
+			(yaffs_Object *) (allocator->freeObjects->siblings.next);
+		allocator->nFreeObjects--;
+	}
+
+	return obj;
+}
+
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(!allocator)
+		YBUG();
+	else {
+		/* Link into the free list. */
+		obj->siblings.next = (struct ylist_head *)(allocator->freeObjects);
+		allocator->freeObjects = obj;
+		allocator->nFreeObjects++;
+	}
+}
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	if(dev->allocator){
+		yaffs_DeinitialiseRawTnodes(dev);
+		yaffs_DeinitialiseRawObjects(dev);
+
+		YFREE(dev->allocator);
+		dev->allocator=NULL;
+	} else
+		YBUG();
+}
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator;
+
+	if(!dev->allocator){
+		allocator = YMALLOC(sizeof(yaffs_Allocator));
+		if(allocator){
+			dev->allocator = allocator;
+			yaffs_InitialiseRawTnodes(dev);
+			yaffs_InitialiseRawObjects(dev);
+		}
+	} else
+		YBUG();
+}
+
+
+#endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.h
@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ALLOCATOR_H__
+#define __YAFFS_ALLOCATOR_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev);
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev);
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev);
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn);
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev);
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj);
+
+#endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.c
@@ -0,0 +1,105 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_bitmap.h"
+#include "yaffs_trace.h"
+/*
+ * Chunk bitmap manipulations
+ */
+
+static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
+{
+	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
+			blk));
+		YBUG();
+	}
+	return dev->chunkBits +
+		(dev->chunkBitmapStride * (blk - dev->internalStartBlock));
+}
+
+void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
+{
+	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
+			chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
+		T(YAFFS_TRACE_ERROR,
+		(TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
+			blk, chunk));
+		YBUG();
+	}
+}
+
+void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+	memset(blkBits, 0, dev->chunkBitmapStride);
+}
+
+void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+	yaffs_VerifyChunkBitId(dev, blk, chunk);
+
+	blkBits[chunk / 8] &= ~(1 << (chunk & 7));
+}
+
+void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+	yaffs_VerifyChunkBitId(dev, blk, chunk);
+
+	blkBits[chunk / 8] |= (1 << (chunk & 7));
+}
+
+int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	yaffs_VerifyChunkBitId(dev, blk, chunk);
+
+	return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+}
+
+int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	int i;
+	for (i = 0; i < dev->chunkBitmapStride; i++) {
+		if (*blkBits)
+			return 1;
+		blkBits++;
+	}
+	return 0;
+}
+
+int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	int i;
+	int n = 0;
+	for (i = 0; i < dev->chunkBitmapStride; i++) {
+		__u8 x = *blkBits;
+		while (x) {
+			if (x & 1)
+				n++;
+			x >>= 1;
+		}
+
+		blkBits++;
+	}
+	return n;
+}
+
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.h
@@ -0,0 +1,31 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+#ifndef __YAFFS_BITMAP_H__
+#define __YAFFS_BITMAP_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk);
+void yaffs_ClearChunkBits(yaffs_Device *dev, int blk);
+void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk);
+void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk);
+int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk);
+int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk);
+int yaffs_CountChunkBits(yaffs_Device *dev, int blk);
+
+#endif
--- a/fs/yaffs2/yaffs_checkptrw.c
+++ b/fs/yaffs2/yaffs_checkptrw.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,16 +11,12 @@
  * published by the Free Software Foundation.
  */
 
-const char *yaffs_checkptrw_c_version =
-	"$Id: yaffs_checkptrw.c,v 1.18 2009-03-06 17:20:49 wookey Exp $";
-
-
 #include "yaffs_checkptrw.h"
 #include "yaffs_getblockinfo.h"
 
-static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
+static int yaffs2_CheckpointSpaceOk(yaffs_Device *dev)
 {
-	int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+	int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
 
 	T(YAFFS_TRACE_CHECKPOINT,
 		(TSTR("checkpt blocks available = %d" TENDSTR),
@@ -30,11 +26,11 @@ static int yaffs_CheckpointSpaceOk(yaffs
 }
 
 
-static int yaffs_CheckpointErase(yaffs_Device *dev)
+static int yaffs2_CheckpointErase(yaffs_Device *dev)
 {
 	int i;
 
-	if (!dev->eraseBlockInNAND)
+	if (!dev->param.eraseBlockInNAND)
 		return 0;
 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checking blocks %d to %d"TENDSTR),
 		dev->internalStartBlock, dev->internalEndBlock));
@@ -43,12 +39,15 @@ static int yaffs_CheckpointErase(yaffs_D
 		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
 		if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
 			T(YAFFS_TRACE_CHECKPOINT, (TSTR("erasing checkpt block %d"TENDSTR), i));
-			if (dev->eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
+
+			dev->nBlockErasures++;
+
+			if (dev->param.eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
 				bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
 				dev->nErasedBlocks++;
-				dev->nFreeChunks += dev->nChunksPerBlock;
+				dev->nFreeChunks += dev->param.nChunksPerBlock;
 			} else {
-				dev->markNANDBlockBad(dev, i);
+				dev->param.markNANDBlockBad(dev, i);
 				bi->blockState = YAFFS_BLOCK_STATE_DEAD;
 			}
 		}
@@ -60,13 +59,13 @@ static int yaffs_CheckpointErase(yaffs_D
 }
 
 
-static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
+static void yaffs2_CheckpointFindNextErasedBlock(yaffs_Device *dev)
 {
 	int  i;
-	int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+	int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
 	T(YAFFS_TRACE_CHECKPOINT,
 		(TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
-		dev->nErasedBlocks, dev->nReservedBlocks, blocksAvailable, dev->checkpointNextBlock));
+		dev->nErasedBlocks, dev->param.nReservedBlocks, blocksAvailable, dev->checkpointNextBlock));
 
 	if (dev->checkpointNextBlock >= 0 &&
 			dev->checkpointNextBlock <= dev->internalEndBlock &&
@@ -88,7 +87,7 @@ static void yaffs_CheckpointFindNextEras
 	dev->checkpointCurrentBlock = -1;
 }
 
-static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
+static void yaffs2_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
 {
 	int  i;
 	yaffs_ExtendedTags tags;
@@ -98,10 +97,10 @@ static void yaffs_CheckpointFindNextChec
 
 	if (dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
 		for (i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++) {
-			int chunk = i * dev->nChunksPerBlock;
+			int chunk = i * dev->param.nChunksPerBlock;
 			int realignedChunk = chunk - dev->chunkOffset;
 
-			dev->readChunkWithTagsFromNAND(dev, realignedChunk,
+			dev->param.readChunkWithTagsFromNAND(dev, realignedChunk,
 					NULL, &tags);
 			T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
 				i, tags.objectId, tags.sequenceNumber, tags.eccResult));
@@ -124,29 +123,29 @@ static void yaffs_CheckpointFindNextChec
 }
 
 
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
+int yaffs2_CheckpointOpen(yaffs_Device *dev, int forWriting)
 {
 
+
+	dev->checkpointOpenForWrite = forWriting;
+
 	/* Got the functions we need? */
-	if (!dev->writeChunkWithTagsToNAND ||
-			!dev->readChunkWithTagsFromNAND ||
-			!dev->eraseBlockInNAND ||
-			!dev->markNANDBlockBad)
+	if (!dev->param.writeChunkWithTagsToNAND ||
+		!dev->param.readChunkWithTagsFromNAND ||
+		!dev->param.eraseBlockInNAND ||
+		!dev->param.markNANDBlockBad)
 		return 0;
 
-	if (forWriting && !yaffs_CheckpointSpaceOk(dev))
+	if (forWriting && !yaffs2_CheckpointSpaceOk(dev))
 		return 0;
 
 	if (!dev->checkpointBuffer)
-		dev->checkpointBuffer = YMALLOC_DMA(dev->totalBytesPerChunk);
+		dev->checkpointBuffer = YMALLOC_DMA(dev->param.totalBytesPerChunk);
 	if (!dev->checkpointBuffer)
 		return 0;
 
 
 	dev->checkpointPageSequence = 0;
-
-	dev->checkpointOpenForWrite = forWriting;
-
 	dev->checkpointByteCount = 0;
 	dev->checkpointSum = 0;
 	dev->checkpointXor = 0;
@@ -158,7 +157,7 @@ int yaffs_CheckpointOpen(yaffs_Device *d
 	if (forWriting) {
 		memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
 		dev->checkpointByteOffset = 0;
-		return yaffs_CheckpointErase(dev);
+		return yaffs2_CheckpointErase(dev);
 	} else {
 		int i;
 		/* Set to a value that will kick off a read */
@@ -168,6 +167,9 @@ int yaffs_CheckpointOpen(yaffs_Device *d
 		dev->blocksInCheckpoint = 0;
 		dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
 		dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
+		if(!dev->checkpointBlockList)
+			return 0;
+
 		for (i = 0; i < dev->checkpointMaxBlocks; i++)
 			dev->checkpointBlockList[i] = -1;
 	}
@@ -175,7 +177,7 @@ int yaffs_CheckpointOpen(yaffs_Device *d
 	return 1;
 }
 
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
+int yaffs2_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
 {
 	__u32 compositeSum;
 	compositeSum =  (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
@@ -183,7 +185,7 @@ int yaffs_GetCheckpointSum(yaffs_Device
 	return 1;
 }
 
-static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
+static int yaffs2_CheckpointFlushBuffer(yaffs_Device *dev)
 {
 	int chunk;
 	int realignedChunk;
@@ -191,7 +193,7 @@ static int yaffs_CheckpointFlushBuffer(y
 	yaffs_ExtendedTags tags;
 
 	if (dev->checkpointCurrentBlock < 0) {
-		yaffs_CheckpointFindNextErasedBlock(dev);
+		yaffs2_CheckpointFindNextErasedBlock(dev);
 		dev->checkpointCurrentChunk = 0;
 	}
 
@@ -211,7 +213,7 @@ static int yaffs_CheckpointFlushBuffer(y
 		dev->blocksInCheckpoint++;
 	}
 
-	chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
+	chunk = dev->checkpointCurrentBlock * dev->param.nChunksPerBlock + dev->checkpointCurrentChunk;
 
 
 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
@@ -219,12 +221,14 @@ static int yaffs_CheckpointFlushBuffer(y
 
 	realignedChunk = chunk - dev->chunkOffset;
 
-	dev->writeChunkWithTagsToNAND(dev, realignedChunk,
+	dev->nPageWrites++;
+
+	dev->param.writeChunkWithTagsToNAND(dev, realignedChunk,
 			dev->checkpointBuffer, &tags);
 	dev->checkpointByteOffset = 0;
 	dev->checkpointPageSequence++;
 	dev->checkpointCurrentChunk++;
-	if (dev->checkpointCurrentChunk >= dev->nChunksPerBlock) {
+	if (dev->checkpointCurrentChunk >= dev->param.nChunksPerBlock) {
 		dev->checkpointCurrentChunk = 0;
 		dev->checkpointCurrentBlock = -1;
 	}
@@ -234,7 +238,7 @@ static int yaffs_CheckpointFlushBuffer(y
 }
 
 
-int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
+int yaffs2_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
 {
 	int i = 0;
 	int ok = 1;
@@ -263,13 +267,13 @@ int yaffs_CheckpointWrite(yaffs_Device *
 
 		if (dev->checkpointByteOffset < 0 ||
 		   dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
-			ok = yaffs_CheckpointFlushBuffer(dev);
+			ok = yaffs2_CheckpointFlushBuffer(dev);
 	}
 
 	return i;
 }
 
-int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
+int yaffs2_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
 {
 	int i = 0;
 	int ok = 1;
@@ -294,7 +298,7 @@ int yaffs_CheckpointRead(yaffs_Device *d
 			dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
 
 			if (dev->checkpointCurrentBlock < 0) {
-				yaffs_CheckpointFindNextCheckpointBlock(dev);
+				yaffs2_CheckpointFindNextCheckpointBlock(dev);
 				dev->checkpointCurrentChunk = 0;
 			}
 
@@ -302,14 +306,16 @@ int yaffs_CheckpointRead(yaffs_Device *d
 				ok = 0;
 			else {
 				chunk = dev->checkpointCurrentBlock *
-					dev->nChunksPerBlock +
+					dev->param.nChunksPerBlock +
 					dev->checkpointCurrentChunk;
 
 				realignedChunk = chunk - dev->chunkOffset;
+				
+				dev->nPageReads++;
 
 				/* read in the next chunk */
 				/* printf("read checkpoint page %d\n",dev->checkpointPage); */
-				dev->readChunkWithTagsFromNAND(dev,
+				dev->param.readChunkWithTagsFromNAND(dev,
 						realignedChunk,
 						dev->checkpointBuffer,
 						&tags);
@@ -323,7 +329,7 @@ int yaffs_CheckpointRead(yaffs_Device *d
 				dev->checkpointPageSequence++;
 				dev->checkpointCurrentChunk++;
 
-				if (dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
+				if (dev->checkpointCurrentChunk >= dev->param.nChunksPerBlock)
 					dev->checkpointCurrentBlock = -1;
 			}
 		}
@@ -342,17 +348,20 @@ int yaffs_CheckpointRead(yaffs_Device *d
 	return 	i;
 }
 
-int yaffs_CheckpointClose(yaffs_Device *dev)
+int yaffs2_CheckpointClose(yaffs_Device *dev)
 {
 
 	if (dev->checkpointOpenForWrite) {
 		if (dev->checkpointByteOffset != 0)
-			yaffs_CheckpointFlushBuffer(dev);
-	} else {
+			yaffs2_CheckpointFlushBuffer(dev);
+	} else if(dev->checkpointBlockList){
 		int i;
 		for (i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++) {
-			yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->checkpointBlockList[i]);
-			if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
+			int blk = dev->checkpointBlockList[i];
+			yaffs_BlockInfo *bi = NULL;
+			if( dev->internalStartBlock <= blk && blk <= dev->internalEndBlock)
+				bi = yaffs_GetBlockInfo(dev, blk);
+			if (bi && bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
 				bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
 			else {
 				/* Todo this looks odd... */
@@ -362,7 +371,7 @@ int yaffs_CheckpointClose(yaffs_Device *
 		dev->checkpointBlockList = NULL;
 	}
 
-	dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
+	dev->nFreeChunks -= dev->blocksInCheckpoint * dev->param.nChunksPerBlock;
 	dev->nErasedBlocks -= dev->blocksInCheckpoint;
 
 
@@ -378,16 +387,14 @@ int yaffs_CheckpointClose(yaffs_Device *
 		return 0;
 }
 
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
+int yaffs2_CheckpointInvalidateStream(yaffs_Device *dev)
 {
-	/* Erase the first checksum block */
-
-	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate"TENDSTR)));
+	/* Erase the checkpoint data */
 
-	if (!yaffs_CheckpointSpaceOk(dev))
-		return 0;
+	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
+		dev->blocksInCheckpoint));
 
-	return yaffs_CheckpointErase(dev);
+	return yaffs2_CheckpointErase(dev);
 }
 
 
--- a/fs/yaffs2/yaffs_checkptrw.h
+++ b/fs/yaffs2/yaffs_checkptrw.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -18,18 +18,17 @@
 
 #include "yaffs_guts.h"
 
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting);
+int yaffs2_CheckpointOpen(yaffs_Device *dev, int forWriting);
 
-int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes);
+int yaffs2_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes);
 
-int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes);
+int yaffs2_CheckpointRead(yaffs_Device *dev, void *data, int nBytes);
 
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
+int yaffs2_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
 
-int yaffs_CheckpointClose(yaffs_Device *dev);
+int yaffs2_CheckpointClose(yaffs_Device *dev);
 
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev);
+int yaffs2_CheckpointInvalidateStream(yaffs_Device *dev);
 
 
 #endif
-
--- a/fs/yaffs2/yaffs_ecc.c
+++ b/fs/yaffs2/yaffs_ecc.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -28,9 +28,6 @@
  * this bytes influence on the line parity.
  */
 
-const char *yaffs_ecc_c_version =
-	"$Id: yaffs_ecc.c,v 1.11 2009-03-06 17:20:50 wookey Exp $";
-
 #include "yportenv.h"
 
 #include "yaffs_ecc.h"
--- a/fs/yaffs2/yaffs_ecc.h
+++ b/fs/yaffs2/yaffs_ecc.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_fs.c
+++ /dev/null
@@ -1,2529 +0,0 @@
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2009 Aleph One Ltd.
- *   for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- * Acknowledgements:
- * Luc van OostenRyck for numerous patches.
- * Nick Bane for numerous patches.
- * Nick Bane for 2.5/2.6 integration.
- * Andras Toth for mknod rdev issue.
- * Michael Fischer for finding the problem with inode inconsistency.
- * Some code bodily lifted from JFFS
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- *
- * This is the file system front-end to YAFFS that hooks it up to
- * the VFS.
- *
- * Special notes:
- * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
- *         this superblock
- * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
- *         superblock
- * >> inode->u.generic_ip points to the associated yaffs_Object.
- */
-
-const char *yaffs_fs_c_version =
-    "$Id: yaffs_fs.c,v 1.79 2009-03-17 01:12:00 wookey Exp $";
-extern const char *yaffs_guts_c_version;
-
-#include <linux/version.h>
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
-#include <linux/config.h>
-#endif
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/proc_fs.h>
-#include <linux/smp_lock.h>
-#include <linux/pagemap.h>
-#include <linux/mtd/mtd.h>
-#include <linux/interrupt.h>
-#include <linux/string.h>
-#include <linux/ctype.h>
-
-#include "asm/div64.h"
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-
-#include <linux/statfs.h>	/* Added NCB 15-8-2003 */
-#include <linux/statfs.h>
-#define UnlockPage(p) unlock_page(p)
-#define Page_Uptodate(page)	test_bit(PG_uptodate, &(page)->flags)
-
-/* FIXME: use sb->s_id instead ? */
-#define yaffs_devname(sb, buf)	bdevname(sb->s_bdev, buf)
-
-#else
-
-#include <linux/locks.h>
-#define	BDEVNAME_SIZE		0
-#define	yaffs_devname(sb, buf)	kdevname(sb->s_dev)
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
-/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
-#define __user
-#endif
-
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
-#define YPROC_ROOT  (&proc_root)
-#else
-#define YPROC_ROOT  NULL
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-#define WRITE_SIZE_STR "writesize"
-#define WRITE_SIZE(mtd) ((mtd)->writesize)
-#else
-#define WRITE_SIZE_STR "oobblock"
-#define WRITE_SIZE(mtd) ((mtd)->oobblock)
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
-#define YAFFS_USE_WRITE_BEGIN_END 1
-#else
-#define YAFFS_USE_WRITE_BEGIN_END 0
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
-static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
-{
-	uint64_t result = partition_size;
-	do_div(result, block_size);
-	return (uint32_t)result;
-}
-#else
-#define YCALCBLOCKS(s, b) ((s)/(b))
-#endif
-
-#include <linux/uaccess.h>
-
-#include "yportenv.h"
-#include "yaffs_guts.h"
-
-#include <linux/mtd/mtd.h>
-#include "yaffs_mtdif.h"
-#include "yaffs_mtdif1.h"
-#include "yaffs_mtdif2.h"
-
-unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
-unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
-unsigned int yaffs_auto_checkpoint = 1;
-
-/* Module Parameters */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-module_param(yaffs_traceMask, uint, 0644);
-module_param(yaffs_wr_attempts, uint, 0644);
-module_param(yaffs_auto_checkpoint, uint, 0644);
-#else
-MODULE_PARM(yaffs_traceMask, "i");
-MODULE_PARM(yaffs_wr_attempts, "i");
-MODULE_PARM(yaffs_auto_checkpoint, "i");
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
-/* use iget and read_inode */
-#define Y_IGET(sb, inum) iget((sb), (inum))
-static void yaffs_read_inode(struct inode *inode);
-
-#else
-/* Call local equivalent */
-#define YAFFS_USE_OWN_IGET
-#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
-
-static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
-#endif
-
-/*#define T(x) printk x */
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
-#define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
-#else
-#define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
-#endif
-
-#define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
-#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-#define yaffs_SuperToDevice(sb)	((yaffs_Device *)sb->s_fs_info)
-#else
-#define yaffs_SuperToDevice(sb)	((yaffs_Device *)sb->u.generic_sbp)
-#endif
-
-static void yaffs_put_super(struct super_block *sb);
-
-static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
-				loff_t *pos);
-static ssize_t yaffs_hold_space(struct file *f);
-static void yaffs_release_space(struct file *f);
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_file_flush(struct file *file, fl_owner_t id);
-#else
-static int yaffs_file_flush(struct file *file);
-#endif
-
-static int yaffs_sync_object(struct file *file, struct dentry *dentry,
-				int datasync);
-
-static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
-			struct nameidata *n);
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
-					struct nameidata *n);
-#else
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
-#endif
-static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
-			struct dentry *dentry);
-static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
-static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
-			const char *symname);
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-			dev_t dev);
-#else
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-			int dev);
-#endif
-static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
-			struct inode *new_dir, struct dentry *new_dentry);
-static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_sync_fs(struct super_block *sb, int wait);
-static void yaffs_write_super(struct super_block *sb);
-#else
-static int yaffs_sync_fs(struct super_block *sb);
-static int yaffs_write_super(struct super_block *sb);
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
-#else
-static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
-#endif
-
-#ifdef YAFFS_HAS_PUT_INODE
-static void yaffs_put_inode(struct inode *inode);
-#endif
-
-static void yaffs_delete_inode(struct inode *);
-static void yaffs_clear_inode(struct inode *);
-
-static int yaffs_readpage(struct file *file, struct page *page);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
-#else
-static int yaffs_writepage(struct page *page);
-#endif
-
-
-#if (YAFFS_USE_WRITE_BEGIN_END != 0)
-static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
-				loff_t pos, unsigned len, unsigned flags,
-				struct page **pagep, void **fsdata);
-static int yaffs_write_end(struct file *filp, struct address_space *mapping,
-				loff_t pos, unsigned len, unsigned copied,
-				struct page *pg, void *fsdadata);
-#else
-static int yaffs_prepare_write(struct file *f, struct page *pg,
-				unsigned offset, unsigned to);
-static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
-				unsigned to);
-
-#endif
-
-static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
-				int buflen);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
-#else
-static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
-#endif
-
-static struct address_space_operations yaffs_file_address_operations = {
-	.readpage = yaffs_readpage,
-	.writepage = yaffs_writepage,
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-	.write_begin = yaffs_write_begin,
-	.write_end = yaffs_write_end,
-#else
-	.prepare_write = yaffs_prepare_write,
-	.commit_write = yaffs_commit_write,
-#endif
-};
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
-static const struct file_operations yaffs_file_operations = {
-	.read = do_sync_read,
-	.write = do_sync_write,
-	.aio_read = generic_file_aio_read,
-	.aio_write = generic_file_aio_write,
-	.mmap = generic_file_mmap,
-	.flush = yaffs_file_flush,
-	.fsync = yaffs_sync_object,
-	.splice_read = generic_file_splice_read,
-	.splice_write = generic_file_splice_write,
-	.llseek = generic_file_llseek,
-};
-
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
-
-static const struct file_operations yaffs_file_operations = {
-	.read = do_sync_read,
-	.write = do_sync_write,
-	.aio_read = generic_file_aio_read,
-	.aio_write = generic_file_aio_write,
-	.mmap = generic_file_mmap,
-	.flush = yaffs_file_flush,
-	.fsync = yaffs_sync_object,
-	.sendfile = generic_file_sendfile,
-};
-
-#else
-
-static const struct file_operations yaffs_file_operations = {
-	.read = generic_file_read,
-	.write = generic_file_write,
-	.mmap = generic_file_mmap,
-	.flush = yaffs_file_flush,
-	.fsync = yaffs_sync_object,
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-	.sendfile = generic_file_sendfile,
-#endif
-};
-#endif
-
-static const struct inode_operations yaffs_file_inode_operations = {
-	.setattr = yaffs_setattr,
-};
-
-static const struct inode_operations yaffs_symlink_inode_operations = {
-	.readlink = yaffs_readlink,
-	.follow_link = yaffs_follow_link,
-	.setattr = yaffs_setattr,
-};
-
-static const struct inode_operations yaffs_dir_inode_operations = {
-	.create = yaffs_create,
-	.lookup = yaffs_lookup,
-	.link = yaffs_link,
-	.unlink = yaffs_unlink,
-	.symlink = yaffs_symlink,
-	.mkdir = yaffs_mkdir,
-	.rmdir = yaffs_unlink,
-	.mknod = yaffs_mknod,
-	.rename = yaffs_rename,
-	.setattr = yaffs_setattr,
-};
-
-static const struct file_operations yaffs_dir_operations = {
-	.read = generic_read_dir,
-	.readdir = yaffs_readdir,
-	.fsync = yaffs_sync_object,
-};
-
-static const struct super_operations yaffs_super_ops = {
-	.statfs = yaffs_statfs,
-
-#ifndef YAFFS_USE_OWN_IGET
-	.read_inode = yaffs_read_inode,
-#endif
-#ifdef YAFFS_HAS_PUT_INODE
-	.put_inode = yaffs_put_inode,
-#endif
-	.put_super = yaffs_put_super,
-	.delete_inode = yaffs_delete_inode,
-	.clear_inode = yaffs_clear_inode,
-	.sync_fs = yaffs_sync_fs,
-	.write_super = yaffs_write_super,
-};
-
-static void yaffs_GrossLock(yaffs_Device *dev)
-{
-	T(YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
-	down(&dev->grossLock);
-	T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
-}
-
-static void yaffs_GrossUnlock(yaffs_Device *dev)
-{
-	T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
-	up(&dev->grossLock);
-}
-
-static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
-			int buflen)
-{
-	unsigned char *alias;
-	int ret;
-
-	yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
-
-	yaffs_GrossLock(dev);
-
-	alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
-
-	yaffs_GrossUnlock(dev);
-
-	if (!alias)
-		return -ENOMEM;
-
-	ret = vfs_readlink(dentry, buffer, buflen, alias);
-	kfree(alias);
-	return ret;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-#else
-static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-#endif
-{
-	unsigned char *alias;
-	int ret;
-	yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
-
-	yaffs_GrossLock(dev);
-
-	alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
-
-	yaffs_GrossUnlock(dev);
-
-	if (!alias) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	ret = vfs_follow_link(nd, alias);
-	kfree(alias);
-out:
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-	return ERR_PTR(ret);
-#else
-	return ret;
-#endif
-}
-
-struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
-				yaffs_Object *obj);
-
-/*
- * Lookup is used to find objects in the fs
- */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
-				struct nameidata *n)
-#else
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
-#endif
-{
-	yaffs_Object *obj;
-	struct inode *inode = NULL;	/* NCB 2.5/2.6 needs NULL here */
-
-	yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
-
-	yaffs_GrossLock(dev);
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_lookup for %d:%s\n",
-		yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
-
-	obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
-					dentry->d_name.name);
-
-	obj = yaffs_GetEquivalentObject(obj);	/* in case it was a hardlink */
-
-	/* Can't hold gross lock when calling yaffs_get_inode() */
-	yaffs_GrossUnlock(dev);
-
-	if (obj) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_lookup found %d\n", obj->objectId));
-
-		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
-
-		if (inode) {
-			T(YAFFS_TRACE_OS,
-				("yaffs_loookup dentry \n"));
-/* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
- * d_add even if NULL inode */
-#if 0
-			/*dget(dentry); // try to solve directory bug */
-			d_add(dentry, inode);
-
-			/* return dentry; */
-			return NULL;
-#endif
-		}
-
-	} else {
-		T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
-
-	}
-
-/* added NCB for 2.5/6 compatability - forces add even if inode is
- * NULL which creates dentry hash */
-	d_add(dentry, inode);
-
-	return NULL;
-}
-
-
-#ifdef YAFFS_HAS_PUT_INODE
-
-/* For now put inode is just for debugging
- * Put inode is called when the inode **structure** is put.
- */
-static void yaffs_put_inode(struct inode *inode)
-{
-	T(YAFFS_TRACE_OS,
-		("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
-		atomic_read(&inode->i_count)));
-
-}
-#endif
-
-/* clear is called to tell the fs to release any per-inode data it holds */
-static void yaffs_clear_inode(struct inode *inode)
-{
-	yaffs_Object *obj;
-	yaffs_Device *dev;
-
-	obj = yaffs_InodeToObject(inode);
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
-		atomic_read(&inode->i_count),
-		obj ? "object exists" : "null object"));
-
-	if (obj) {
-		dev = obj->myDev;
-		yaffs_GrossLock(dev);
-
-		/* Clear the association between the inode and
-		 * the yaffs_Object.
-		 */
-		obj->myInode = NULL;
-		yaffs_InodeToObjectLV(inode) = NULL;
-
-		/* If the object freeing was deferred, then the real
-		 * free happens now.
-		 * This should fix the inode inconsistency problem.
-		 */
-
-		yaffs_HandleDeferedFree(obj);
-
-		yaffs_GrossUnlock(dev);
-	}
-
-}
-
-/* delete is called when the link count is zero and the inode
- * is put (ie. nobody wants to know about it anymore, time to
- * delete the file).
- * NB Must call clear_inode()
- */
-static void yaffs_delete_inode(struct inode *inode)
-{
-	yaffs_Object *obj = yaffs_InodeToObject(inode);
-	yaffs_Device *dev;
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
-		atomic_read(&inode->i_count),
-		obj ? "object exists" : "null object"));
-
-	if (obj) {
-		dev = obj->myDev;
-		yaffs_GrossLock(dev);
-		yaffs_DeleteObject(obj);
-		yaffs_GrossUnlock(dev);
-	}
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-	truncate_inode_pages(&inode->i_data, 0);
-#endif
-	clear_inode(inode);
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_file_flush(struct file *file, fl_owner_t id)
-#else
-static int yaffs_file_flush(struct file *file)
-#endif
-{
-	yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
-
-	yaffs_Device *dev = obj->myDev;
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_file_flush object %d (%s)\n", obj->objectId,
-		obj->dirty ? "dirty" : "clean"));
-
-	yaffs_GrossLock(dev);
-
-	yaffs_FlushFile(obj, 1);
-
-	yaffs_GrossUnlock(dev);
-
-	return 0;
-}
-
-static int yaffs_readpage_nolock(struct file *f, struct page *pg)
-{
-	/* Lifted from jffs2 */
-
-	yaffs_Object *obj;
-	unsigned char *pg_buf;
-	int ret;
-
-	yaffs_Device *dev;
-
-	T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
-			(unsigned)(pg->index << PAGE_CACHE_SHIFT),
-			(unsigned)PAGE_CACHE_SIZE));
-
-	obj = yaffs_DentryToObject(f->f_dentry);
-
-	dev = obj->myDev;
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-	BUG_ON(!PageLocked(pg));
-#else
-	if (!PageLocked(pg))
-		PAGE_BUG(pg);
-#endif
-
-	pg_buf = kmap(pg);
-	/* FIXME: Can kmap fail? */
-
-	yaffs_GrossLock(dev);
-
-	ret = yaffs_ReadDataFromFile(obj, pg_buf,
-				pg->index << PAGE_CACHE_SHIFT,
-				PAGE_CACHE_SIZE);
-
-	yaffs_GrossUnlock(dev);
-
-	if (ret >= 0)
-		ret = 0;
-
-	if (ret) {
-		ClearPageUptodate(pg);
-		SetPageError(pg);
-	} else {
-		SetPageUptodate(pg);
-		ClearPageError(pg);
-	}
-
-	flush_dcache_page(pg);
-	kunmap(pg);
-
-	T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
-	return ret;
-}
-
-static int yaffs_readpage_unlock(struct file *f, struct page *pg)
-{
-	int ret = yaffs_readpage_nolock(f, pg);
-	UnlockPage(pg);
-	return ret;
-}
-
-static int yaffs_readpage(struct file *f, struct page *pg)
-{
-	return yaffs_readpage_unlock(f, pg);
-}
-
-/* writepage inspired by/stolen from smbfs */
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
-#else
-static int yaffs_writepage(struct page *page)
-#endif
-{
-	struct address_space *mapping = page->mapping;
-	loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
-	struct inode *inode;
-	unsigned long end_index;
-	char *buffer;
-	yaffs_Object *obj;
-	int nWritten = 0;
-	unsigned nBytes;
-
-	if (!mapping)
-		BUG();
-	inode = mapping->host;
-	if (!inode)
-		BUG();
-
-	if (offset > inode->i_size) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_writepage at %08x, inode size = %08x!!!\n",
-			(unsigned)(page->index << PAGE_CACHE_SHIFT),
-			(unsigned)inode->i_size));
-		T(YAFFS_TRACE_OS,
-			("                -> don't care!!\n"));
-		unlock_page(page);
-		return 0;
-	}
-
-	end_index = inode->i_size >> PAGE_CACHE_SHIFT;
-
-	/* easy case */
-	if (page->index < end_index)
-		nBytes = PAGE_CACHE_SIZE;
-	else
-		nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
-
-	get_page(page);
-
-	buffer = kmap(page);
-
-	obj = yaffs_InodeToObject(inode);
-	yaffs_GrossLock(obj->myDev);
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_writepage at %08x, size %08x\n",
-		(unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
-	T(YAFFS_TRACE_OS,
-		("writepag0: obj = %05x, ino = %05x\n",
-		(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
-
-	nWritten = yaffs_WriteDataToFile(obj, buffer,
-			page->index << PAGE_CACHE_SHIFT, nBytes, 0);
-
-	T(YAFFS_TRACE_OS,
-		("writepag1: obj = %05x, ino = %05x\n",
-		(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
-
-	yaffs_GrossUnlock(obj->myDev);
-
-	kunmap(page);
-	SetPageUptodate(page);
-	UnlockPage(page);
-	put_page(page);
-
-	return (nWritten == nBytes) ? 0 : -ENOSPC;
-}
-
-
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
-				loff_t pos, unsigned len, unsigned flags,
-				struct page **pagep, void **fsdata)
-{
-	struct page *pg = NULL;
-	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-	uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
-	uint32_t to = offset + len;
-
-	int ret = 0;
-	int space_held = 0;
-
-	T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
-	/* Get a page */
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)
-	pg = grab_cache_page_write_begin(mapping, index, flags);
-#else
-	pg = __grab_cache_page(mapping, index);
-#endif
-
-	*pagep = pg;
-	if (!pg) {
-		ret =  -ENOMEM;
-		goto out;
-	}
-	/* Get fs space */
-	space_held = yaffs_hold_space(filp);
-
-	if (!space_held) {
-		ret = -ENOSPC;
-		goto out;
-	}
-
-	/* Update page if required */
-
-	if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
-		ret = yaffs_readpage_nolock(filp, pg);
-
-	if (ret)
-		goto out;
-
-	/* Happy path return */
-	T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
-
-	return 0;
-
-out:
-	T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
-	if (space_held)
-		yaffs_release_space(filp);
-	if (pg) {
-		unlock_page(pg);
-		page_cache_release(pg);
-	}
-	return ret;
-}
-
-#else
-
-static int yaffs_prepare_write(struct file *f, struct page *pg,
-				unsigned offset, unsigned to)
-{
-	T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
-
-	if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
-		return yaffs_readpage_nolock(f, pg);
-	return 0;
-}
-#endif
-
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-static int yaffs_write_end(struct file *filp, struct address_space *mapping,
-				loff_t pos, unsigned len, unsigned copied,
-				struct page *pg, void *fsdadata)
-{
-	int ret = 0;
-	void *addr, *kva;
-	uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
-
-	kva = kmap(pg);
-	addr = kva + offset_into_page;
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_write_end addr %x pos %x nBytes %d\n",
-		(unsigned) addr,
-		(int)pos, copied));
-
-	ret = yaffs_file_write(filp, addr, copied, &pos);
-
-	if (ret != copied) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_write_end not same size ret %d  copied %d\n",
-			ret, copied));
-		SetPageError(pg);
-		ClearPageUptodate(pg);
-	} else {
-		SetPageUptodate(pg);
-	}
-
-	kunmap(pg);
-
-	yaffs_release_space(filp);
-	unlock_page(pg);
-	page_cache_release(pg);
-	return ret;
-}
-#else
-
-static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
-				unsigned to)
-{
-	void *addr, *kva;
-
-	loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
-	int nBytes = to - offset;
-	int nWritten;
-
-	unsigned spos = pos;
-	unsigned saddr;
-
-	kva = kmap(pg);
-	addr = kva + offset;
-
-	saddr = (unsigned) addr;
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_commit_write addr %x pos %x nBytes %d\n",
-		saddr, spos, nBytes));
-
-	nWritten = yaffs_file_write(f, addr, nBytes, &pos);
-
-	if (nWritten != nBytes) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_commit_write not same size nWritten %d  nBytes %d\n",
-			nWritten, nBytes));
-		SetPageError(pg);
-		ClearPageUptodate(pg);
-	} else {
-		SetPageUptodate(pg);
-	}
-
-	kunmap(pg);
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_commit_write returning %d\n",
-		nWritten == nBytes ? 0 : nWritten));
-
-	return nWritten == nBytes ? 0 : nWritten;
-}
-#endif
-
-
-static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
-{
-	if (inode && obj) {
-
-
-		/* Check mode against the variant type and attempt to repair if broken. */
-		__u32 mode = obj->yst_mode;
-		switch (obj->variantType) {
-		case YAFFS_OBJECT_TYPE_FILE:
-			if (!S_ISREG(mode)) {
-				obj->yst_mode &= ~S_IFMT;
-				obj->yst_mode |= S_IFREG;
-			}
-
-			break;
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-			if (!S_ISLNK(mode)) {
-				obj->yst_mode &= ~S_IFMT;
-				obj->yst_mode |= S_IFLNK;
-			}
-
-			break;
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			if (!S_ISDIR(mode)) {
-				obj->yst_mode &= ~S_IFMT;
-				obj->yst_mode |= S_IFDIR;
-			}
-
-			break;
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-		default:
-			/* TODO? */
-			break;
-		}
-
-		inode->i_flags |= S_NOATIME;
-
-		inode->i_ino = obj->objectId;
-		inode->i_mode = obj->yst_mode;
-		inode->i_uid = obj->yst_uid;
-		inode->i_gid = obj->yst_gid;
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
-		inode->i_blksize = inode->i_sb->s_blocksize;
-#endif
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-
-		inode->i_rdev = old_decode_dev(obj->yst_rdev);
-		inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
-		inode->i_atime.tv_nsec = 0;
-		inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
-		inode->i_mtime.tv_nsec = 0;
-		inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
-		inode->i_ctime.tv_nsec = 0;
-#else
-		inode->i_rdev = obj->yst_rdev;
-		inode->i_atime = obj->yst_atime;
-		inode->i_mtime = obj->yst_mtime;
-		inode->i_ctime = obj->yst_ctime;
-#endif
-		inode->i_size = yaffs_GetObjectFileLength(obj);
-		inode->i_blocks = (inode->i_size + 511) >> 9;
-
-		inode->i_nlink = yaffs_GetObjectLinkCount(obj);
-
-		T(YAFFS_TRACE_OS,
-			("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
-			inode->i_mode, inode->i_uid, inode->i_gid,
-			(int)inode->i_size, atomic_read(&inode->i_count)));
-
-		switch (obj->yst_mode & S_IFMT) {
-		default:	/* fifo, device or socket */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-			init_special_inode(inode, obj->yst_mode,
-					old_decode_dev(obj->yst_rdev));
-#else
-			init_special_inode(inode, obj->yst_mode,
-					(dev_t) (obj->yst_rdev));
-#endif
-			break;
-		case S_IFREG:	/* file */
-			inode->i_op = &yaffs_file_inode_operations;
-			inode->i_fop = &yaffs_file_operations;
-			inode->i_mapping->a_ops =
-				&yaffs_file_address_operations;
-			break;
-		case S_IFDIR:	/* directory */
-			inode->i_op = &yaffs_dir_inode_operations;
-			inode->i_fop = &yaffs_dir_operations;
-			break;
-		case S_IFLNK:	/* symlink */
-			inode->i_op = &yaffs_symlink_inode_operations;
-			break;
-		}
-
-		yaffs_InodeToObjectLV(inode) = obj;
-
-		obj->myInode = inode;
-
-	} else {
-		T(YAFFS_TRACE_OS,
-			("yaffs_FileInode invalid parameters\n"));
-	}
-
-}
-
-struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
-				yaffs_Object *obj)
-{
-	struct inode *inode;
-
-	if (!sb) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_get_inode for NULL super_block!!\n"));
-		return NULL;
-
-	}
-
-	if (!obj) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_get_inode for NULL object!!\n"));
-		return NULL;
-
-	}
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_get_inode for object %d\n", obj->objectId));
-
-	inode = Y_IGET(sb, obj->objectId);
-	if (IS_ERR(inode))
-		return NULL;
-
-	/* NB Side effect: iget calls back to yaffs_read_inode(). */
-	/* iget also increments the inode's i_count */
-	/* NB You can't be holding grossLock or deadlock will happen! */
-
-	return inode;
-}
-
-static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
-				loff_t *pos)
-{
-	yaffs_Object *obj;
-	int nWritten, ipos;
-	struct inode *inode;
-	yaffs_Device *dev;
-
-	obj = yaffs_DentryToObject(f->f_dentry);
-
-	dev = obj->myDev;
-
-	yaffs_GrossLock(dev);
-
-	inode = f->f_dentry->d_inode;
-
-	if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
-		ipos = inode->i_size;
-	else
-		ipos = *pos;
-
-	if (!obj)
-		T(YAFFS_TRACE_OS,
-			("yaffs_file_write: hey obj is null!\n"));
-	else
-		T(YAFFS_TRACE_OS,
-			("yaffs_file_write about to write writing %zu bytes"
-			"to object %d at %d\n",
-			n, obj->objectId, ipos));
-
-	nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_file_write writing %zu bytes, %d written at %d\n",
-		n, nWritten, ipos));
-
-	if (nWritten > 0) {
-		ipos += nWritten;
-		*pos = ipos;
-		if (ipos > inode->i_size) {
-			inode->i_size = ipos;
-			inode->i_blocks = (ipos + 511) >> 9;
-
-			T(YAFFS_TRACE_OS,
-				("yaffs_file_write size updated to %d bytes, "
-				"%d blocks\n",
-				ipos, (int)(inode->i_blocks)));
-		}
-
-	}
-	yaffs_GrossUnlock(dev);
-	return nWritten == 0 ? -ENOSPC : nWritten;
-}
-
-/* Space holding and freeing is done to ensure we have space available for write_begin/end */
-/* For now we just assume few parallel writes and check against a small number. */
-/* Todo: need to do this with a counter to handle parallel reads better */
-
-static ssize_t yaffs_hold_space(struct file *f)
-{
-	yaffs_Object *obj;
-	yaffs_Device *dev;
-
-	int nFreeChunks;
-
-
-	obj = yaffs_DentryToObject(f->f_dentry);
-
-	dev = obj->myDev;
-
-	yaffs_GrossLock(dev);
-
-	nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
-
-	yaffs_GrossUnlock(dev);
-
-	return (nFreeChunks > 20) ? 1 : 0;
-}
-
-static void yaffs_release_space(struct file *f)
-{
-	yaffs_Object *obj;
-	yaffs_Device *dev;
-
-
-	obj = yaffs_DentryToObject(f->f_dentry);
-
-	dev = obj->myDev;
-
-	yaffs_GrossLock(dev);
-
-
-	yaffs_GrossUnlock(dev);
-}
-
-static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
-{
-	yaffs_Object *obj;
-	yaffs_Device *dev;
-	struct inode *inode = f->f_dentry->d_inode;
-	unsigned long offset, curoffs;
-	struct ylist_head *i;
-	yaffs_Object *l;
-
-	char name[YAFFS_MAX_NAME_LENGTH + 1];
-
-	obj = yaffs_DentryToObject(f->f_dentry);
-	dev = obj->myDev;
-
-	yaffs_GrossLock(dev);
-
-	offset = f->f_pos;
-
-	T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
-
-	if (offset == 0) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_readdir: entry . ino %d \n",
-			(int)inode->i_ino));
-		if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
-			goto out;
-		offset++;
-		f->f_pos++;
-	}
-	if (offset == 1) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_readdir: entry .. ino %d \n",
-			(int)f->f_dentry->d_parent->d_inode->i_ino));
-		if (filldir(dirent, "..", 2, offset,
-			f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
-			goto out;
-		offset++;
-		f->f_pos++;
-	}
-
-	curoffs = 1;
-
-	/* If the directory has changed since the open or last call to
-	   readdir, rewind to after the 2 canned entries. */
-
-	if (f->f_version != inode->i_version) {
-		offset = 2;
-		f->f_pos = offset;
-		f->f_version = inode->i_version;
-	}
-
-	ylist_for_each(i, &obj->variant.directoryVariant.children) {
-		curoffs++;
-		if (curoffs >= offset) {
-			l = ylist_entry(i, yaffs_Object, siblings);
-
-			yaffs_GetObjectName(l, name,
-					    YAFFS_MAX_NAME_LENGTH + 1);
-			T(YAFFS_TRACE_OS,
-			  ("yaffs_readdir: %s inode %d\n", name,
-			   yaffs_GetObjectInode(l)));
-
-			if (filldir(dirent,
-					name,
-					strlen(name),
-					offset,
-					yaffs_GetObjectInode(l),
-					yaffs_GetObjectType(l)) < 0)
-				goto up_and_out;
-
-			offset++;
-			f->f_pos++;
-		}
-	}
-
-up_and_out:
-out:
-	yaffs_GrossUnlock(dev);
-
-	return 0;
-}
-
-/*
- * File creation. Allocate an inode, and we're done..
- */
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
-#define YCRED(x) x
-#else
-#define YCRED(x) (x->cred)
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-			dev_t rdev)
-#else
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-			int rdev)
-#endif
-{
-	struct inode *inode;
-
-	yaffs_Object *obj = NULL;
-	yaffs_Device *dev;
-
-	yaffs_Object *parent = yaffs_InodeToObject(dir);
-
-	int error = -ENOSPC;
-	uid_t uid = YCRED(current)->fsuid;
-	gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
-
-	if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
-		mode |= S_ISGID;
-
-	if (parent) {
-		T(YAFFS_TRACE_OS,
-			("yaffs_mknod: parent object %d type %d\n",
-			parent->objectId, parent->variantType));
-	} else {
-		T(YAFFS_TRACE_OS,
-			("yaffs_mknod: could not get parent object\n"));
-		return -EPERM;
-	}
-
-	T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
-			"mode %x dev %x\n",
-			dentry->d_name.name, mode, rdev));
-
-	dev = parent->myDev;
-
-	yaffs_GrossLock(dev);
-
-	switch (mode & S_IFMT) {
-	default:
-		/* Special (socket, fifo, device...) */
-		T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-		obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
-				gid, old_encode_dev(rdev));
-#else
-		obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
-				gid, rdev);
-#endif
-		break;
-	case S_IFREG:		/* file          */
-		T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
-		obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
-				gid);
-		break;
-	case S_IFDIR:		/* directory */
-		T(YAFFS_TRACE_OS,
-			("yaffs_mknod: making directory\n"));
-		obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
-					uid, gid);
-		break;
-	case S_IFLNK:		/* symlink */
-		T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
-		obj = NULL;	/* Do we ever get here? */
-		break;
-	}
-
-	/* Can not call yaffs_get_inode() with gross lock held */
-	yaffs_GrossUnlock(dev);
-
-	if (obj) {
-		inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
-		d_instantiate(dentry, inode);
-		T(YAFFS_TRACE_OS,
-			("yaffs_mknod created object %d count = %d\n",
-			obj->objectId, atomic_read(&inode->i_count)));
-		error = 0;
-	} else {
-		T(YAFFS_TRACE_OS,
-			("yaffs_mknod failed making object\n"));
-		error = -ENOMEM;
-	}
-
-	return error;
-}
-
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
-	int retVal;
-	T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
-	retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
-	return retVal;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
-			struct nameidata *n)
-#else
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
-#endif
-{
-	T(YAFFS_TRACE_OS, ("yaffs_create\n"));
-	return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
-}
-
-static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
-{
-	int retVal;
-
-	yaffs_Device *dev;
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
-		dentry->d_name.name));
-
-	dev = yaffs_InodeToObject(dir)->myDev;
-
-	yaffs_GrossLock(dev);
-
-	retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
-
-	if (retVal == YAFFS_OK) {
-		dentry->d_inode->i_nlink--;
-		dir->i_version++;
-		yaffs_GrossUnlock(dev);
-		mark_inode_dirty(dentry->d_inode);
-		return 0;
-	}
-	yaffs_GrossUnlock(dev);
-	return -ENOTEMPTY;
-}
-
-/*
- * Create a link...
- */
-static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
-			struct dentry *dentry)
-{
-	struct inode *inode = old_dentry->d_inode;
-	yaffs_Object *obj = NULL;
-	yaffs_Object *link = NULL;
-	yaffs_Device *dev;
-
-	T(YAFFS_TRACE_OS, ("yaffs_link\n"));
-
-	obj = yaffs_InodeToObject(inode);
-	dev = obj->myDev;
-
-	yaffs_GrossLock(dev);
-
-	if (!S_ISDIR(inode->i_mode))		/* Don't link directories */
-		link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
-			obj);
-
-	if (link) {
-		old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
-		d_instantiate(dentry, old_dentry->d_inode);
-		atomic_inc(&old_dentry->d_inode->i_count);
-		T(YAFFS_TRACE_OS,
-			("yaffs_link link count %d i_count %d\n",
-			old_dentry->d_inode->i_nlink,
-			atomic_read(&old_dentry->d_inode->i_count)));
-	}
-
-	yaffs_GrossUnlock(dev);
-
-	if (link)
-		return 0;
-
-	return -EPERM;
-}
-
-static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
-				const char *symname)
-{
-	yaffs_Object *obj;
-	yaffs_Device *dev;
-	uid_t uid = YCRED(current)->fsuid;
-	gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
-
-	T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
-
-	dev = yaffs_InodeToObject(dir)->myDev;
-	yaffs_GrossLock(dev);
-	obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
-				S_IFLNK | S_IRWXUGO, uid, gid, symname);
-	yaffs_GrossUnlock(dev);
-
-	if (obj) {
-		struct inode *inode;
-
-		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
-		d_instantiate(dentry, inode);
-		T(YAFFS_TRACE_OS, ("symlink created OK\n"));
-		return 0;
-	} else {
-		T(YAFFS_TRACE_OS, ("symlink not created\n"));
-	}
-
-	return -ENOMEM;
-}
-
-static int yaffs_sync_object(struct file *file, struct dentry *dentry,
-				int datasync)
-{
-
-	yaffs_Object *obj;
-	yaffs_Device *dev;
-
-	obj = yaffs_DentryToObject(dentry);
-
-	dev = obj->myDev;
-
-	T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
-	yaffs_GrossLock(dev);
-	yaffs_FlushFile(obj, 1);
-	yaffs_GrossUnlock(dev);
-	return 0;
-}
-
-/*
- * The VFS layer already does all the dentry stuff for rename.
- *
- * NB: POSIX says you can rename an object over an old object of the same name
- */
-static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
-			struct inode *new_dir, struct dentry *new_dentry)
-{
-	yaffs_Device *dev;
-	int retVal = YAFFS_FAIL;
-	yaffs_Object *target;
-
-	T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
-	dev = yaffs_InodeToObject(old_dir)->myDev;
-
-	yaffs_GrossLock(dev);
-
-	/* Check if the target is an existing directory that is not empty. */
-	target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
-				new_dentry->d_name.name);
-
-
-
-	if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
-		!ylist_empty(&target->variant.directoryVariant.children)) {
-
-		T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
-
-		retVal = YAFFS_FAIL;
-	} else {
-		/* Now does unlinking internally using shadowing mechanism */
-		T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
-
-		retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
-				old_dentry->d_name.name,
-				yaffs_InodeToObject(new_dir),
-				new_dentry->d_name.name);
-	}
-	yaffs_GrossUnlock(dev);
-
-	if (retVal == YAFFS_OK) {
-		if (target) {
-			new_dentry->d_inode->i_nlink--;
-			mark_inode_dirty(new_dentry->d_inode);
-		}
-
-		return 0;
-	} else {
-		return -ENOTEMPTY;
-	}
-}
-
-static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
-{
-	struct inode *inode = dentry->d_inode;
-	int error;
-	yaffs_Device *dev;
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_setattr of object %d\n",
-		yaffs_InodeToObject(inode)->objectId));
-
-	error = inode_change_ok(inode, attr);
-	if (error == 0) {
-		dev = yaffs_InodeToObject(inode)->myDev;
-		yaffs_GrossLock(dev);
-		if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
-				YAFFS_OK) {
-			error = 0;
-		} else {
-			error = -EPERM;
-		}
-		yaffs_GrossUnlock(dev);
-		if (!error)
-			error = inode_setattr(inode, attr);
-	}
-	return error;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
-	yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
-	struct super_block *sb = dentry->d_sb;
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
-{
-	yaffs_Device *dev = yaffs_SuperToDevice(sb);
-#else
-static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
-{
-	yaffs_Device *dev = yaffs_SuperToDevice(sb);
-#endif
-
-	T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
-
-	yaffs_GrossLock(dev);
-
-	buf->f_type = YAFFS_MAGIC;
-	buf->f_bsize = sb->s_blocksize;
-	buf->f_namelen = 255;
-
-	if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
-		/* Do this if chunk size is not a power of 2 */
-
-		uint64_t bytesInDev;
-		uint64_t bytesFree;
-
-		bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) *
-			((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
-
-		do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
-		buf->f_blocks = bytesInDev;
-
-		bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
-			((uint64_t)(dev->nDataBytesPerChunk));
-
-		do_div(bytesFree, sb->s_blocksize);
-
-		buf->f_bfree = bytesFree;
-
-	} else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
-
-		buf->f_blocks =
-			(dev->endBlock - dev->startBlock + 1) *
-			dev->nChunksPerBlock /
-			(sb->s_blocksize / dev->nDataBytesPerChunk);
-		buf->f_bfree =
-			yaffs_GetNumberOfFreeChunks(dev) /
-			(sb->s_blocksize / dev->nDataBytesPerChunk);
-	} else {
-		buf->f_blocks =
-			(dev->endBlock - dev->startBlock + 1) *
-			dev->nChunksPerBlock *
-			(dev->nDataBytesPerChunk / sb->s_blocksize);
-
-		buf->f_bfree =
-			yaffs_GetNumberOfFreeChunks(dev) *
-			(dev->nDataBytesPerChunk / sb->s_blocksize);
-	}
-
-	buf->f_files = 0;
-	buf->f_ffree = 0;
-	buf->f_bavail = buf->f_bfree;
-
-	yaffs_GrossUnlock(dev);
-	return 0;
-}
-
-
-static int yaffs_do_sync_fs(struct super_block *sb)
-{
-
-	yaffs_Device *dev = yaffs_SuperToDevice(sb);
-	T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
-
-	if (sb->s_dirt) {
-		yaffs_GrossLock(dev);
-
-		if (dev) {
-			yaffs_FlushEntireDeviceCache(dev);
-			yaffs_CheckpointSave(dev);
-		}
-
-		yaffs_GrossUnlock(dev);
-
-		sb->s_dirt = 0;
-	}
-	return 0;
-}
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static void yaffs_write_super(struct super_block *sb)
-#else
-static int yaffs_write_super(struct super_block *sb)
-#endif
-{
-
-	T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
-	if (yaffs_auto_checkpoint >= 2)
-		yaffs_do_sync_fs(sb);
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
-	return 0;
-#endif
-}
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_sync_fs(struct super_block *sb, int wait)
-#else
-static int yaffs_sync_fs(struct super_block *sb)
-#endif
-{
-	T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
-
-	if (yaffs_auto_checkpoint >= 1)
-		yaffs_do_sync_fs(sb);
-
-	return 0;
-}
-
-#ifdef YAFFS_USE_OWN_IGET
-
-static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
-{
-	struct inode *inode;
-	yaffs_Object *obj;
-	yaffs_Device *dev = yaffs_SuperToDevice(sb);
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_iget for %lu\n", ino));
-
-	inode = iget_locked(sb, ino);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
-	if (!(inode->i_state & I_NEW))
-		return inode;
-
-	/* NB This is called as a side effect of other functions, but
-	 * we had to release the lock to prevent deadlocks, so
-	 * need to lock again.
-	 */
-
-	yaffs_GrossLock(dev);
-
-	obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
-
-	yaffs_FillInodeFromObject(inode, obj);
-
-	yaffs_GrossUnlock(dev);
-
-	unlock_new_inode(inode);
-	return inode;
-}
-
-#else
-
-static void yaffs_read_inode(struct inode *inode)
-{
-	/* NB This is called as a side effect of other functions, but
-	 * we had to release the lock to prevent deadlocks, so
-	 * need to lock again.
-	 */
-
-	yaffs_Object *obj;
-	yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
-
-	T(YAFFS_TRACE_OS,
-		("yaffs_read_inode for %d\n", (int)inode->i_ino));
-
-	yaffs_GrossLock(dev);
-
-	obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
-
-	yaffs_FillInodeFromObject(inode, obj);
-
-	yaffs_GrossUnlock(dev);
-}
-
-#endif
-
-static YLIST_HEAD(yaffs_dev_list);
-
-#if 0 /* not used */
-static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
-{
-	yaffs_Device    *dev = yaffs_SuperToDevice(sb);
-
-	if (*flags & MS_RDONLY) {
-		struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
-
-		T(YAFFS_TRACE_OS,
-			("yaffs_remount_fs: %s: RO\n", dev->name));
-
-		yaffs_GrossLock(dev);
-
-		yaffs_FlushEntireDeviceCache(dev);
-
-		yaffs_CheckpointSave(dev);
-
-		if (mtd->sync)
-			mtd->sync(mtd);
-
-		yaffs_GrossUnlock(dev);
-	} else {
-		T(YAFFS_TRACE_OS,
-			("yaffs_remount_fs: %s: RW\n", dev->name));
-	}
-
-	return 0;
-}
-#endif
-
-static void yaffs_put_super(struct super_block *sb)
-{
-	yaffs_Device *dev = yaffs_SuperToDevice(sb);
-
-	T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
-
-	yaffs_GrossLock(dev);
-
-	yaffs_FlushEntireDeviceCache(dev);
-
-	yaffs_CheckpointSave(dev);
-
-	if (dev->putSuperFunc)
-		dev->putSuperFunc(sb);
-
-	yaffs_Deinitialise(dev);
-
-	yaffs_GrossUnlock(dev);
-
-	/* we assume this is protected by lock_kernel() in mount/umount */
-	ylist_del(&dev->devList);
-
-	if (dev->spareBuffer) {
-		YFREE(dev->spareBuffer);
-		dev->spareBuffer = NULL;
-	}
-
-	kfree(dev);
-}
-
-
-static void yaffs_MTDPutSuper(struct super_block *sb)
-{
-	struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
-
-	if (mtd->sync)
-		mtd->sync(mtd);
-
-	put_mtd_device(mtd);
-}
-
-
-static void yaffs_MarkSuperBlockDirty(void *vsb)
-{
-	struct super_block *sb = (struct super_block *)vsb;
-
-	T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
-	if (sb)
-		sb->s_dirt = 1;
-}
-
-typedef struct {
-	int inband_tags;
-	int skip_checkpoint_read;
-	int skip_checkpoint_write;
-	int no_cache;
-} yaffs_options;
-
-#define MAX_OPT_LEN 20
-static int yaffs_parse_options(yaffs_options *options, const char *options_str)
-{
-	char cur_opt[MAX_OPT_LEN + 1];
-	int p;
-	int error = 0;
-
-	/* Parse through the options which is a comma seperated list */
-
-	while (options_str && *options_str && !error) {
-		memset(cur_opt, 0, MAX_OPT_LEN + 1);
-		p = 0;
-
-		while (*options_str && *options_str != ',') {
-			if (p < MAX_OPT_LEN) {
-				cur_opt[p] = *options_str;
-				p++;
-			}
-			options_str++;
-		}
-
-		if (!strcmp(cur_opt, "inband-tags"))
-			options->inband_tags = 1;
-		else if (!strcmp(cur_opt, "no-cache"))
-			options->no_cache = 1;
-		else if (!strcmp(cur_opt, "no-checkpoint-read"))
-			options->skip_checkpoint_read = 1;
-		else if (!strcmp(cur_opt, "no-checkpoint-write"))
-			options->skip_checkpoint_write = 1;
-		else if (!strcmp(cur_opt, "no-checkpoint")) {
-			options->skip_checkpoint_read = 1;
-			options->skip_checkpoint_write = 1;
-		} else {
-			printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
-					cur_opt);
-			error = 1;
-		}
-	}
-
-	return error;
-}
-
-static struct super_block *yaffs_internal_read_super(int yaffsVersion,
-						struct super_block *sb,
-						void *data, int silent)
-{
-	int nBlocks;
-	struct inode *inode = NULL;
-	struct dentry *root;
-	yaffs_Device *dev = 0;
-	char devname_buf[BDEVNAME_SIZE + 1];
-	struct mtd_info *mtd;
-	int err;
-	char *data_str = (char *)data;
-
-	yaffs_options options;
-
-	sb->s_magic = YAFFS_MAGIC;
-	sb->s_op = &yaffs_super_ops;
-	sb->s_flags |= MS_NOATIME;
-
-	if (!sb)
-		printk(KERN_INFO "yaffs: sb is NULL\n");
-	else if (!sb->s_dev)
-		printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
-	else if (!yaffs_devname(sb, devname_buf))
-		printk(KERN_INFO "yaffs: devname is NULL\n");
-	else
-		printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
-		       sb->s_dev,
-		       yaffs_devname(sb, devname_buf));
-
-	if (!data_str)
-		data_str = "";
-
-	printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
-
-	memset(&options, 0, sizeof(options));
-
-	if (yaffs_parse_options(&options, data_str)) {
-		/* Option parsing failed */
-		return NULL;
-	}
-
-
-	sb->s_blocksize = PAGE_CACHE_SIZE;
-	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
-	T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
-	T(YAFFS_TRACE_OS,
-	  ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
-
-#ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
-	T(YAFFS_TRACE_OS,
-	  ("yaffs: Write verification disabled. All guarantees "
-	   "null and void\n"));
-#endif
-
-	T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
-			       "\"%s\"\n",
-			       MAJOR(sb->s_dev), MINOR(sb->s_dev),
-			       yaffs_devname(sb, devname_buf)));
-
-	/* Check it's an mtd device..... */
-	if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
-		return NULL;	/* This isn't an mtd device */
-
-	/* Get the device */
-	mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
-	if (!mtd) {
-		T(YAFFS_TRACE_ALWAYS,
-		  ("yaffs: MTD device #%u doesn't appear to exist\n",
-		   MINOR(sb->s_dev)));
-		return NULL;
-	}
-	/* Check it's NAND */
-	if (mtd->type != MTD_NANDFLASH) {
-		T(YAFFS_TRACE_ALWAYS,
-		  ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
-		return NULL;
-	}
-
-	T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
-	T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
-	T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
-	T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
-	T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
-	T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
-	T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
-	T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
-	T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
-	T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
-	T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
-#else
-	T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
-#endif
-
-#ifdef CONFIG_YAFFS_AUTO_YAFFS2
-
-	if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
-		T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
-		yaffsVersion = 2;
-	}
-
-	/* Added NCB 26/5/2006 for completeness */
-	if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
-		T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
-		yaffsVersion = 1;
-	}
-
-#endif
-
-	if (yaffsVersion == 2) {
-		/* Check for version 2 style functions */
-		if (!mtd->erase ||
-		    !mtd->block_isbad ||
-		    !mtd->block_markbad ||
-		    !mtd->read ||
-		    !mtd->write ||
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-		    !mtd->read_oob || !mtd->write_oob) {
-#else
-		    !mtd->write_ecc ||
-		    !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
-#endif
-			T(YAFFS_TRACE_ALWAYS,
-			  ("yaffs: MTD device does not support required "
-			   "functions\n"));;
-			return NULL;
-		}
-
-		if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
-		    mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
-		    !options.inband_tags) {
-			T(YAFFS_TRACE_ALWAYS,
-			  ("yaffs: MTD device does not have the "
-			   "right page sizes\n"));
-			return NULL;
-		}
-	} else {
-		/* Check for V1 style functions */
-		if (!mtd->erase ||
-		    !mtd->read ||
-		    !mtd->write ||
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-		    !mtd->read_oob || !mtd->write_oob) {
-#else
-		    !mtd->write_ecc ||
-		    !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
-#endif
-			T(YAFFS_TRACE_ALWAYS,
-			  ("yaffs: MTD device does not support required "
-			   "functions\n"));;
-			return NULL;
-		}
-
-		if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
-		    mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
-			T(YAFFS_TRACE_ALWAYS,
-			  ("yaffs: MTD device does not support have the "
-			   "right page sizes\n"));
-			return NULL;
-		}
-	}
-
-	/* OK, so if we got here, we have an MTD that's NAND and looks
-	 * like it has the right capabilities
-	 * Set the yaffs_Device up for mtd
-	 */
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-	sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
-#else
-	sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
-#endif
-	if (!dev) {
-		/* Deep shit could not allocate device structure */
-		T(YAFFS_TRACE_ALWAYS,
-		  ("yaffs_read_super: Failed trying to allocate "
-		   "yaffs_Device. \n"));
-		return NULL;
-	}
-
-	memset(dev, 0, sizeof(yaffs_Device));
-	dev->genericDevice = mtd;
-	dev->name = mtd->name;
-
-	/* Set up the memory size parameters.... */
-
-	nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
-
-	dev->startBlock = 0;
-	dev->endBlock = nBlocks - 1;
-	dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
-	dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
-	dev->nReservedBlocks = 5;
-	dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
-	dev->inbandTags = options.inband_tags;
-
-	/* ... and the functions. */
-	if (yaffsVersion == 2) {
-		dev->writeChunkWithTagsToNAND =
-		    nandmtd2_WriteChunkWithTagsToNAND;
-		dev->readChunkWithTagsFromNAND =
-		    nandmtd2_ReadChunkWithTagsFromNAND;
-		dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
-		dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
-		dev->spareBuffer = YMALLOC(mtd->oobsize);
-		dev->isYaffs2 = 1;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-		dev->totalBytesPerChunk = mtd->writesize;
-		dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
-#else
-		dev->totalBytesPerChunk = mtd->oobblock;
-		dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
-#endif
-		nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
-
-		dev->startBlock = 0;
-		dev->endBlock = nBlocks - 1;
-	} else {
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-		/* use the MTD interface in yaffs_mtdif1.c */
-		dev->writeChunkWithTagsToNAND =
-			nandmtd1_WriteChunkWithTagsToNAND;
-		dev->readChunkWithTagsFromNAND =
-			nandmtd1_ReadChunkWithTagsFromNAND;
-		dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
-		dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
-#else
-		dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
-		dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
-#endif
-		dev->isYaffs2 = 0;
-	}
-	/* ... and common functions */
-	dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
-	dev->initialiseNAND = nandmtd_InitialiseNAND;
-
-	dev->putSuperFunc = yaffs_MTDPutSuper;
-
-	dev->superBlock = (void *)sb;
-	dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
-
-
-#ifndef CONFIG_YAFFS_DOES_ECC
-	dev->useNANDECC = 1;
-#endif
-
-#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
-	dev->wideTnodesDisabled = 1;
-#endif
-
-	dev->skipCheckpointRead = options.skip_checkpoint_read;
-	dev->skipCheckpointWrite = options.skip_checkpoint_write;
-
-	/* we assume this is protected by lock_kernel() in mount/umount */
-	ylist_add_tail(&dev->devList, &yaffs_dev_list);
-
-	init_MUTEX(&dev->grossLock);
-
-	yaffs_GrossLock(dev);
-
-	err = yaffs_GutsInitialise(dev);
-
-	T(YAFFS_TRACE_OS,
-	  ("yaffs_read_super: guts initialised %s\n",
-	   (err == YAFFS_OK) ? "OK" : "FAILED"));
-
-	/* Release lock before yaffs_get_inode() */
-	yaffs_GrossUnlock(dev);
-
-	/* Create root inode */
-	if (err == YAFFS_OK)
-		inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
-					yaffs_Root(dev));
-
-	if (!inode)
-		return NULL;
-
-	inode->i_op = &yaffs_dir_inode_operations;
-	inode->i_fop = &yaffs_dir_operations;
-
-	T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
-
-	root = d_alloc_root(inode);
-
-	T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
-
-	if (!root) {
-		iput(inode);
-		return NULL;
-	}
-	sb->s_root = root;
-	sb->s_dirt = !dev->isCheckpointed;
-	T(YAFFS_TRACE_ALWAYS,
-	  ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
-
-	T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
-	return sb;
-}
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
-					 int silent)
-{
-	return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_read_super(struct file_system_type *fs,
-			    int flags, const char *dev_name,
-			    void *data, struct vfsmount *mnt)
-{
-
-	return get_sb_bdev(fs, flags, dev_name, data,
-			   yaffs_internal_read_super_mtd, mnt);
-}
-#else
-static struct super_block *yaffs_read_super(struct file_system_type *fs,
-					    int flags, const char *dev_name,
-					    void *data)
-{
-
-	return get_sb_bdev(fs, flags, dev_name, data,
-			   yaffs_internal_read_super_mtd);
-}
-#endif
-
-static struct file_system_type yaffs_fs_type = {
-	.owner = THIS_MODULE,
-	.name = "yaffs",
-	.get_sb = yaffs_read_super,
-	.kill_sb = kill_block_super,
-	.fs_flags = FS_REQUIRES_DEV,
-};
-#else
-static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
-					    int silent)
-{
-	return yaffs_internal_read_super(1, sb, data, silent);
-}
-
-static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
-		      FS_REQUIRES_DEV);
-#endif
-
-
-#ifdef CONFIG_YAFFS_YAFFS2
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
-					  int silent)
-{
-	return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs2_read_super(struct file_system_type *fs,
-			int flags, const char *dev_name, void *data,
-			struct vfsmount *mnt)
-{
-	return get_sb_bdev(fs, flags, dev_name, data,
-			yaffs2_internal_read_super_mtd, mnt);
-}
-#else
-static struct super_block *yaffs2_read_super(struct file_system_type *fs,
-					     int flags, const char *dev_name,
-					     void *data)
-{
-
-	return get_sb_bdev(fs, flags, dev_name, data,
-			   yaffs2_internal_read_super_mtd);
-}
-#endif
-
-static struct file_system_type yaffs2_fs_type = {
-	.owner = THIS_MODULE,
-	.name = "yaffs2",
-	.get_sb = yaffs2_read_super,
-	.kill_sb = kill_block_super,
-	.fs_flags = FS_REQUIRES_DEV,
-};
-#else
-static struct super_block *yaffs2_read_super(struct super_block *sb,
-					     void *data, int silent)
-{
-	return yaffs_internal_read_super(2, sb, data, silent);
-}
-
-static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
-		      FS_REQUIRES_DEV);
-#endif
-
-#endif				/* CONFIG_YAFFS_YAFFS2 */
-
-static struct proc_dir_entry *my_proc_entry;
-
-static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
-{
-	buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
-	buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
-	buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
-	buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
-	buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
-	buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
-	buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
-	buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
-	buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
-	buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
-	buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
-	buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
-	buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
-	buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
-	buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
-	buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
-	buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
-	buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
-	buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
-	buf += sprintf(buf, "passiveGCs......... %d\n",
-		    dev->passiveGarbageCollections);
-	buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
-	buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
-	buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
-	buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
-	buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
-	buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
-	buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
-	buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
-	buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
-	buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
-	buf +=
-	    sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
-	buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
-	buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
-	buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
-
-	return buf;
-}
-
-static int yaffs_proc_read(char *page,
-			   char **start,
-			   off_t offset, int count, int *eof, void *data)
-{
-	struct ylist_head *item;
-	char *buf = page;
-	int step = offset;
-	int n = 0;
-
-	/* Get proc_file_read() to step 'offset' by one on each sucessive call.
-	 * We use 'offset' (*ppos) to indicate where we are in devList.
-	 * This also assumes the user has posted a read buffer large
-	 * enough to hold the complete output; but that's life in /proc.
-	 */
-
-	*(int *)start = 1;
-
-	/* Print header first */
-	if (step == 0) {
-		buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
-			       "\n%s\n%s\n", yaffs_fs_c_version,
-			       yaffs_guts_c_version);
-	}
-
-	/* hold lock_kernel while traversing yaffs_dev_list */
-	lock_kernel();
-
-	/* Locate and print the Nth entry.  Order N-squared but N is small. */
-	ylist_for_each(item, &yaffs_dev_list) {
-		yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
-		if (n < step) {
-			n++;
-			continue;
-		}
-		buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
-		buf = yaffs_dump_dev(buf, dev);
-		break;
-	}
-	unlock_kernel();
-
-	return buf - page < count ? buf - page : count;
-}
-
-/**
- * Set the verbosity of the warnings and error messages.
- *
- * Note that the names can only be a..z or _ with the current code.
- */
-
-static struct {
-	char *mask_name;
-	unsigned mask_bitfield;
-} mask_flags[] = {
-	{"allocate", YAFFS_TRACE_ALLOCATE},
-	{"always", YAFFS_TRACE_ALWAYS},
-	{"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
-	{"buffers", YAFFS_TRACE_BUFFERS},
-	{"bug", YAFFS_TRACE_BUG},
-	{"checkpt", YAFFS_TRACE_CHECKPOINT},
-	{"deletion", YAFFS_TRACE_DELETION},
-	{"erase", YAFFS_TRACE_ERASE},
-	{"error", YAFFS_TRACE_ERROR},
-	{"gc_detail", YAFFS_TRACE_GC_DETAIL},
-	{"gc", YAFFS_TRACE_GC},
-	{"mtd", YAFFS_TRACE_MTD},
-	{"nandaccess", YAFFS_TRACE_NANDACCESS},
-	{"os", YAFFS_TRACE_OS},
-	{"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
-	{"scan", YAFFS_TRACE_SCAN},
-	{"tracing", YAFFS_TRACE_TRACING},
-
-	{"verify", YAFFS_TRACE_VERIFY},
-	{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
-	{"verify_full", YAFFS_TRACE_VERIFY_FULL},
-	{"verify_all", YAFFS_TRACE_VERIFY_ALL},
-
-	{"write", YAFFS_TRACE_WRITE},
-	{"all", 0xffffffff},
-	{"none", 0},
-	{NULL, 0},
-};
-
-#define MAX_MASK_NAME_LENGTH 40
-static int yaffs_proc_write(struct file *file, const char *buf,
-					 unsigned long count, void *data)
-{
-	unsigned rg = 0, mask_bitfield;
-	char *end;
-	char *mask_name;
-	const char *x;
-	char substring[MAX_MASK_NAME_LENGTH + 1];
-	int i;
-	int done = 0;
-	int add, len = 0;
-	int pos = 0;
-
-	rg = yaffs_traceMask;
-
-	while (!done && (pos < count)) {
-		done = 1;
-		while ((pos < count) && isspace(buf[pos]))
-			pos++;
-
-		switch (buf[pos]) {
-		case '+':
-		case '-':
-		case '=':
-			add = buf[pos];
-			pos++;
-			break;
-
-		default:
-			add = ' ';
-			break;
-		}
-		mask_name = NULL;
-
-		mask_bitfield = simple_strtoul(buf + pos, &end, 0);
-
-		if (end > buf + pos) {
-			mask_name = "numeral";
-			len = end - (buf + pos);
-			pos += len;
-			done = 0;
-		} else {
-			for (x = buf + pos, i = 0;
-			    (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
-			    i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
-				substring[i] = *x;
-			substring[i] = '\0';
-
-			for (i = 0; mask_flags[i].mask_name != NULL; i++) {
-				if (strcmp(substring, mask_flags[i].mask_name) == 0) {
-					mask_name = mask_flags[i].mask_name;
-					mask_bitfield = mask_flags[i].mask_bitfield;
-					done = 0;
-					break;
-				}
-			}
-		}
-
-		if (mask_name != NULL) {
-			done = 0;
-			switch (add) {
-			case '-':
-				rg &= ~mask_bitfield;
-				break;
-			case '+':
-				rg |= mask_bitfield;
-				break;
-			case '=':
-				rg = mask_bitfield;
-				break;
-			default:
-				rg |= mask_bitfield;
-				break;
-			}
-		}
-	}
-
-	yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
-
-	printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
-
-	if (rg & YAFFS_TRACE_ALWAYS) {
-		for (i = 0; mask_flags[i].mask_name != NULL; i++) {
-			char flag;
-			flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
-			printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
-		}
-	}
-
-	return count;
-}
-
-/* Stuff to handle installation of file systems */
-struct file_system_to_install {
-	struct file_system_type *fst;
-	int installed;
-};
-
-static struct file_system_to_install fs_to_install[] = {
-	{&yaffs_fs_type, 0},
-	{&yaffs2_fs_type, 0},
-	{NULL, 0}
-};
-
-static int __init init_yaffs_fs(void)
-{
-	int error = 0;
-	struct file_system_to_install *fsinst;
-
-	T(YAFFS_TRACE_ALWAYS,
-	  ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
-
-	/* Install the proc_fs entry */
-	my_proc_entry = create_proc_entry("yaffs",
-					       S_IRUGO | S_IFREG,
-					       YPROC_ROOT);
-
-	if (my_proc_entry) {
-		my_proc_entry->write_proc = yaffs_proc_write;
-		my_proc_entry->read_proc = yaffs_proc_read;
-		my_proc_entry->data = NULL;
-	} else
-		return -ENOMEM;
-
-	/* Now add the file system entries */
-
-	fsinst = fs_to_install;
-
-	while (fsinst->fst && !error) {
-		error = register_filesystem(fsinst->fst);
-		if (!error)
-			fsinst->installed = 1;
-		fsinst++;
-	}
-
-	/* Any errors? uninstall  */
-	if (error) {
-		fsinst = fs_to_install;
-
-		while (fsinst->fst) {
-			if (fsinst->installed) {
-				unregister_filesystem(fsinst->fst);
-				fsinst->installed = 0;
-			}
-			fsinst++;
-		}
-	}
-
-	return error;
-}
-
-static void __exit exit_yaffs_fs(void)
-{
-
-	struct file_system_to_install *fsinst;
-
-	T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
-			       " removing. \n"));
-
-	remove_proc_entry("yaffs", YPROC_ROOT);
-
-	fsinst = fs_to_install;
-
-	while (fsinst->fst) {
-		if (fsinst->installed) {
-			unregister_filesystem(fsinst->fst);
-			fsinst->installed = 0;
-		}
-		fsinst++;
-	}
-}
-
-module_init(init_yaffs_fs)
-module_exit(exit_yaffs_fs)
-
-MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
-MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
-MODULE_LICENSE("GPL");
--- a/fs/yaffs2/yaffs_getblockinfo.h
+++ b/fs/yaffs2/yaffs_getblockinfo.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -17,6 +17,7 @@
 #define __YAFFS_GETBLOCKINFO_H__
 
 #include "yaffs_guts.h"
+#include "yaffs_trace.h"
 
 /* Function to manipulate block info */
 static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
--- a/fs/yaffs2/yaffs_guts.c
+++ b/fs/yaffs2/yaffs_guts.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -10,11 +10,8 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-
-const char *yaffs_guts_c_version =
-    "$Id: yaffs_guts.c,v 1.82 2009-03-09 04:24:17 charles Exp $";
-
 #include "yportenv.h"
+#include "yaffs_trace.h"
 
 #include "yaffsinterface.h"
 #include "yaffs_guts.h"
@@ -22,22 +19,28 @@ const char *yaffs_guts_c_version =
 #include "yaffs_getblockinfo.h"
 
 #include "yaffs_tagscompat.h"
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
-#include "yaffs_qsort.h"
-#endif
+
 #include "yaffs_nand.h"
 
-#include "yaffs_checkptrw.h"
+#include "yaffs_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
 
 #include "yaffs_nand.h"
 #include "yaffs_packedtags2.h"
 
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
 
-#define YAFFS_PASSIVE_GC_CHUNKS 2
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
 
 #include "yaffs_ecc.h"
 
 
+
 /* Robustification (if it ever comes about...) */
 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
@@ -49,33 +52,26 @@ static void yaffs_HandleUpdateChunk(yaff
 				const yaffs_ExtendedTags *tags);
 
 /* Other local prototypes */
+static void yaffs_UpdateParent(yaffs_Object *obj);
 static int yaffs_UnlinkObject(yaffs_Object *obj);
 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
 
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
-
 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
 					const __u8 *buffer,
 					yaffs_ExtendedTags *tags,
 					int useReserve);
-static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
-				int chunkInNAND, int inScan);
+
 
 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
 					yaffs_ObjectType type);
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
-				yaffs_Object *obj);
-static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
-				int force, int isShrink, int shadows);
+
+
+static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod);
+
 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
 static int yaffs_CheckStructures(void);
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
-			int chunkOffset, int *limit);
 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
 
-static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
-
-
 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 				int chunkInNAND);
 
@@ -87,30 +83,22 @@ static int yaffs_TagsMatch(const yaffs_E
 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
 				yaffs_BlockInfo **blockUsedPtr);
 
-static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
-
 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
 
-static void yaffs_VerifyDirectory(yaffs_Object *directory);
-#ifdef YAFFS_PARANOID
-static int yaffs_CheckFileSanity(yaffs_Object *in);
-#else
-#define yaffs_CheckFileSanity(in)
-#endif
-
 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
-
 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
 				yaffs_ExtendedTags *tags);
 
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
-		unsigned pos);
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
-					yaffs_FileStructure *fStruct,
-					__u32 chunkId);
+static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
+					int chunkInNAND,
+					const __u8 *data,
+					yaffs_ExtendedTags *tags);
+
+
+static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize);
+static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev,YCHAR *ohName, const YCHAR *name);
 
 
 /* Function to calculate chunk and offset */
@@ -172,7 +160,7 @@ static __u32 ShiftsGE(__u32 x)
 
 static __u32 Shifts(__u32 x)
 {
-	int nShifts;
+	__u32 nShifts;
 
 	nShifts =  0;
 
@@ -203,7 +191,7 @@ static int yaffs_InitialiseTempBuffers(y
 	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
 		dev->tempBuffer[i].line = 0;	/* not in use */
 		dev->tempBuffer[i].buffer = buf =
-		    YMALLOC_DMA(dev->totalBytesPerChunk);
+		    YMALLOC_DMA(dev->param.totalBytesPerChunk);
 	}
 
 	return buf ? YAFFS_OK : YAFFS_FAIL;
@@ -286,7 +274,7 @@ int yaffs_IsManagedTempBuffer(yaffs_Devi
 			return 1;
 	}
 
-	for (i = 0; i < dev->nShortOpCaches; i++) {
+	for (i = 0; i < dev->param.nShortOpCaches; i++) {
 		if (dev->srCache[i].data == buffer)
 			return 1;
 	}
@@ -299,6374 +287,4183 @@ int yaffs_IsManagedTempBuffer(yaffs_Devi
 	return 0;
 }
 
-
-
 /*
- * Chunk bitmap manipulations
+ * Verification code
  */
 
-static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
-{
-	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
-		T(YAFFS_TRACE_ERROR,
-			(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
-			blk));
-		YBUG();
-	}
-	return dev->chunkBits +
-		(dev->chunkBitmapStride * (blk - dev->internalStartBlock));
-}
 
-static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
-{
-	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
-			chunk < 0 || chunk >= dev->nChunksPerBlock) {
-		T(YAFFS_TRACE_ERROR,
-		(TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
-			blk, chunk));
-		YBUG();
-	}
-}
 
-static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
-{
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
 
-	memset(blkBits, 0, dev->chunkBitmapStride);
-}
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
 
-static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
+static Y_INLINE int yaffs_HashFunction(int n)
 {
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-
-	yaffs_VerifyChunkBitId(dev, blk, chunk);
-
-	blkBits[chunk / 8] &= ~(1 << (chunk & 7));
+	n = abs(n);
+	return n % YAFFS_NOBJECT_BUCKETS;
 }
 
-static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
-{
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-
-	yaffs_VerifyChunkBitId(dev, blk, chunk);
-
-	blkBits[chunk / 8] |= (1 << (chunk & 7));
-}
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
 
-static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
+yaffs_Object *yaffs_Root(yaffs_Device *dev)
 {
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-	yaffs_VerifyChunkBitId(dev, blk, chunk);
-
-	return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+	return dev->rootDir;
 }
 
-static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
+yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 {
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-	int i;
-	for (i = 0; i < dev->chunkBitmapStride; i++) {
-		if (*blkBits)
-			return 1;
-		blkBits++;
-	}
-	return 0;
+	return dev->lostNFoundDir;
 }
 
-static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
-{
-	__u8 *blkBits = yaffs_BlockBits(dev, blk);
-	int i;
-	int n = 0;
-	for (i = 0; i < dev->chunkBitmapStride; i++) {
-		__u8 x = *blkBits;
-		while (x) {
-			if (x & 1)
-				n++;
-			x >>= 1;
-		}
-
-		blkBits++;
-	}
-	return n;
-}
 
 /*
- * Verification code
+ *  Erased NAND checking functions
  */
 
-static int yaffs_SkipVerification(yaffs_Device *dev)
-{
-	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_SkipFullVerification(yaffs_Device *dev)
-{
-	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_SkipNANDVerification(yaffs_Device *dev)
+int yaffs_CheckFF(__u8 *buffer, int nBytes)
 {
-	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+	/* Horrible, slow implementation */
+	while (nBytes--) {
+		if (*buffer != 0xFF)
+			return 0;
+		buffer++;
+	}
+	return 1;
 }
 
-static const char *blockStateName[] = {
-"Unknown",
-"Needs scanning",
-"Scanning",
-"Empty",
-"Allocating",
-"Full",
-"Dirty",
-"Checkpoint",
-"Collecting",
-"Dead"
-};
-
-static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+				int chunkInNAND)
 {
-	int actuallyUsed;
-	int inUse;
+	int retval = YAFFS_OK;
+	__u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
+	yaffs_ExtendedTags tags;
+	int result;
 
-	if (yaffs_SkipVerification(dev))
-		return;
+	result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 
-	/* Report illegal runtime states */
-	if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
-		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
+	if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
+		retval = YAFFS_FAIL;
 
-	switch (bi->blockState) {
-	case YAFFS_BLOCK_STATE_UNKNOWN:
-	case YAFFS_BLOCK_STATE_SCANNING:
-	case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
-		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
-		n, blockStateName[bi->blockState]));
+	if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
+		T(YAFFS_TRACE_NANDACCESS,
+		  (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
+		retval = YAFFS_FAIL;
 	}
 
-	/* Check pages in use and soft deletions are legal */
-
-	actuallyUsed = bi->pagesInUse - bi->softDeletions;
-
-	if (bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
-	   bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
-	   actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
-		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
-		n, bi->pagesInUse, bi->softDeletions));
-
+	yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 
-	/* Check chunk bitmap legal */
-	inUse = yaffs_CountChunkBits(dev, n);
-	if (inUse != bi->pagesInUse)
-		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
-			n, bi->pagesInUse, inUse));
+	return retval;
 
-	/* Check that the sequence number is valid.
-	 * Ten million is legal, but is very unlikely
-	 */
-	if (dev->isYaffs2 &&
-	   (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
-	   (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
-		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
-		n, bi->sequenceNumber));
 }
 
-static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
-		int n)
+
+static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
+					int chunkInNAND,
+					const __u8 *data,
+					yaffs_ExtendedTags *tags)
 {
-	yaffs_VerifyBlock(dev, bi, n);
+	int retval = YAFFS_OK;
+	yaffs_ExtendedTags tempTags;
+	__u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
+	int result;
+	
+	result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
+	if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
+		tempTags.objectId != tags->objectId ||
+		tempTags.chunkId  != tags->chunkId ||
+		tempTags.byteCount != tags->byteCount)
+		retval = YAFFS_FAIL;
 
-	/* After collection the block should be in the erased state */
-	/* This will need to change if we do partial gc */
+	yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 
-	if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
-			bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
-		T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
-			n, bi->blockState));
-	}
+	return retval;
 }
 
-static void yaffs_VerifyBlocks(yaffs_Device *dev)
+static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
+					const __u8 *data,
+					yaffs_ExtendedTags *tags,
+					int useReserve)
 {
-	int i;
-	int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
-	int nIllegalBlockStates = 0;
-
-	if (yaffs_SkipVerification(dev))
-		return;
-
-	memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
-
-	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
-		yaffs_VerifyBlock(dev, bi, i);
-
-		if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
-			nBlocksPerState[bi->blockState]++;
-		else
-			nIllegalBlockStates++;
-	}
+	int attempts = 0;
+	int writeOk = 0;
+	int chunk;
 
-	T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
-	T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
+	yaffs2_InvalidateCheckpoint(dev);
 
-	T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
-	if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
-		T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
+	do {
+		yaffs_BlockInfo *bi = 0;
+		int erasedOk = 0;
 
-	for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
-		T(YAFFS_TRACE_VERIFY,
-		  (TSTR("%s %d blocks"TENDSTR),
-		  blockStateName[i], nBlocksPerState[i]));
+		chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
+		if (chunk < 0) {
+			/* no space */
+			break;
+		}
 
-	if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
-		 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
+		/* First check this chunk is erased, if it needs
+		 * checking.  The checking policy (unless forced
+		 * always on) is as follows:
+		 *
+		 * Check the first page we try to write in a block.
+		 * If the check passes then we don't need to check any
+		 * more.	If the check fails, we check again...
+		 * If the block has been erased, we don't need to check.
+		 *
+		 * However, if the block has been prioritised for gc,
+		 * then we think there might be something odd about
+		 * this block and stop using it.
+		 *
+		 * Rationale: We should only ever see chunks that have
+		 * not been erased if there was a partially written
+		 * chunk due to power loss.  This checking policy should
+		 * catch that case with very few checks and thus save a
+		 * lot of checks that are most likely not needed.
+		 *
+		 * Mods to the above
+		 * If an erase check fails or the write fails we skip the 
+		 * rest of the block.
+		 */
 
-	if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
-		 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
+		/* let's give it a try */
+		attempts++;
 
-	if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
-		T(YAFFS_TRACE_VERIFY,
-		 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
-		 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
+		if(dev->param.alwaysCheckErased)
+			bi->skipErasedCheck = 0;
 
-	T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
+		if (!bi->skipErasedCheck) {
+			erasedOk = yaffs_CheckChunkErased(dev, chunk);
+			if (erasedOk != YAFFS_OK) {
+				T(YAFFS_TRACE_ERROR,
+				(TSTR("**>> yaffs chunk %d was not erased"
+				TENDSTR), chunk));
 
-}
+				/* If not erased, delete this one,
+				 * skip rest of block and
+				 * try another chunk */
+				 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
+				 yaffs_SkipRestOfBlock(dev);
+				continue;
+			}
+		}
 
-/*
- * Verify the object header. oh must be valid, but obj and tags may be NULL in which
- * case those tests will not be performed.
- */
-static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
-{
-	if (obj && yaffs_SkipVerification(obj->myDev))
-		return;
+		writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
+				data, tags);
 
-	if (!(tags && obj && oh)) {
-		T(YAFFS_TRACE_VERIFY,
-				(TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
-				(__u32)tags, (__u32)obj, (__u32)oh));
-		return;
-	}
+		if(!bi->skipErasedCheck)
+			writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
 
-	if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
-			oh->type > YAFFS_OBJECT_TYPE_MAX)
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
-			tags->objectId, oh->type));
+		if (writeOk != YAFFS_OK) {
+			/* Clean up aborted write, skip to next block and
+			 * try another chunk */
+			yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
+			continue;
+		}
 
-	if (tags->objectId != obj->objectId)
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d header mismatch objectId %d"TENDSTR),
-			tags->objectId, obj->objectId));
+		bi->skipErasedCheck = 1;
 
+		/* Copy the data into the robustification buffer */
+		yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
 
-	/*
-	 * Check that the object's parent ids match if parentCheck requested.
-	 *
-	 * Tests do not apply to the root object.
-	 */
+	} while (writeOk != YAFFS_OK &&
+		(yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
 
-	if (parentCheck && tags->objectId > 1 && !obj->parent)
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
-			tags->objectId, oh->parentObjectId));
+	if (!writeOk)
+		chunk = -1;
 
-	if (parentCheck && obj->parent &&
-			oh->parentObjectId != obj->parent->objectId &&
-			(oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
-			obj->parent->objectId != YAFFS_OBJECTID_DELETED))
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
-			tags->objectId, oh->parentObjectId, obj->parent->objectId));
+	if (attempts > 1) {
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("**>> yaffs write required %d attempts" TENDSTR),
+			attempts));
 
-	if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d header name is NULL"TENDSTR),
-			obj->objectId));
+		dev->nRetriedWrites += (attempts - 1);
+	}
 
-	if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d header name is 0xFF"TENDSTR),
-			obj->objectId));
+	return chunk;
 }
 
 
+ 
+/*
+ * Block retiring for handling a broken block.
+ */
 
-static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
-					__u32 level, int chunkOffset)
+static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
 {
-	int i;
-	yaffs_Device *dev = obj->myDev;
-	int ok = 1;
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
 
-	if (tn) {
-		if (level > 0) {
+	yaffs2_InvalidateCheckpoint(dev);
+	
+	yaffs2_ClearOldestDirtySequence(dev,bi);
 
-			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
-				if (tn->internal[i]) {
-					ok = yaffs_VerifyTnodeWorker(obj,
-							tn->internal[i],
-							level - 1,
-							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
-				}
-			}
-		} else if (level == 0) {
+	if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
+		if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
+			T(YAFFS_TRACE_ALWAYS, (TSTR(
+				"yaffs: Failed to mark bad and erase block %d"
+				TENDSTR), blockInNAND));
+		} else {
 			yaffs_ExtendedTags tags;
-			__u32 objectId = obj->objectId;
+			int chunkId = blockInNAND * dev->param.nChunksPerBlock;
 
-			chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
+			__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 
-			for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
-				__u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+			memset(buffer, 0xff, dev->nDataBytesPerChunk);
+			yaffs_InitialiseTags(&tags);
+			tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
+			if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
+				dev->chunkOffset, buffer, &tags) != YAFFS_OK)
+				T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
+					TCONT("write bad block marker to block %d")
+					TENDSTR), blockInNAND));
 
-				if (theChunk > 0) {
-					/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
-					yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
-					if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
-						T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
-							objectId, chunkOffset, theChunk,
-							tags.objectId, tags.chunkId));
-					}
-				}
-				chunkOffset++;
-			}
+			yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 		}
 	}
 
-	return ok;
+	bi->blockState = YAFFS_BLOCK_STATE_DEAD;
+	bi->gcPrioritise = 0;
+	bi->needsRetiring = 0;
 
+	dev->nRetiredBlocks++;
 }
 
+/*
+ * Functions for robustisizing TODO
+ *
+ */
 
-static void yaffs_VerifyFile(yaffs_Object *obj)
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
+				const __u8 *data,
+				const yaffs_ExtendedTags *tags)
 {
-	int requiredTallness;
-	int actualTallness;
-	__u32 lastChunk;
-	__u32 x;
-	__u32 i;
-	yaffs_Device *dev;
-	yaffs_ExtendedTags tags;
-	yaffs_Tnode *tn;
-	__u32 objectId;
+	dev=dev;
+	chunkInNAND=chunkInNAND;
+	data=data;
+	tags=tags;
+}
 
-	if (!obj)
-		return;
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
+				const yaffs_ExtendedTags *tags)
+{
+	dev=dev;
+	chunkInNAND=chunkInNAND;
+	tags=tags;
+}
 
-	if (yaffs_SkipVerification(obj->myDev))
-		return;
+void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+	if (!bi->gcPrioritise) {
+		bi->gcPrioritise = 1;
+		dev->hasPendingPrioritisedGCs = 1;
+		bi->chunkErrorStrikes++;
 
-	dev = obj->myDev;
-	objectId = obj->objectId;
+		if (bi->chunkErrorStrikes > 3) {
+			bi->needsRetiring = 1; /* Too many stikes, so retire this */
+			T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
 
-	/* Check file size is consistent with tnode depth */
-	lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
-	x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
-	requiredTallness = 0;
-	while (x > 0) {
-		x >>= YAFFS_TNODES_INTERNAL_BITS;
-		requiredTallness++;
+		}
 	}
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
+		int erasedOk)
+{
+	int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
 
-	actualTallness = obj->variant.fileVariant.topLevel;
+	yaffs_HandleChunkError(dev, bi);
 
-	if (requiredTallness > actualTallness)
-		T(YAFFS_TRACE_VERIFY,
-		(TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
-		 obj->objectId, actualTallness, requiredTallness));
+	if (erasedOk) {
+		/* Was an actual write failure, so mark the block for retirement  */
+		bi->needsRetiring = 1;
+		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
+	}
+
+	/* Delete the chunk */
+	yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+	yaffs_SkipRestOfBlock(dev);
+}
 
 
-	/* Check that the chunks in the tnode tree are all correct.
-	 * We do this by scanning through the tnode tree and
-	 * checking the tags for every chunk match.
-	 */
+/*---------------- Name handling functions ------------*/
 
-	if (yaffs_SkipNANDVerification(dev))
-		return;
+static __u16 yaffs_CalcNameSum(const YCHAR *name)
+{
+	__u16 sum = 0;
+	__u16 i = 1;
 
-	for (i = 1; i <= lastChunk; i++) {
-		tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
+	const YUCHAR *bname = (const YUCHAR *) name;
+	if (bname) {
+		while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
 
-		if (tn) {
-			__u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-			if (theChunk > 0) {
-				/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
-				yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
-				if (tags.objectId != objectId || tags.chunkId != i) {
-					T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
-						objectId, i, theChunk,
-						tags.objectId, tags.chunkId));
-				}
-			}
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+			sum += yaffs_toupper(*bname) * i;
+#else
+			sum += (*bname) * i;
+#endif
+			i++;
+			bname++;
 		}
 	}
+	return sum;
 }
 
-
-static void yaffs_VerifyHardLink(yaffs_Object *obj)
+void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
 {
-	if (obj && yaffs_SkipVerification(obj->myDev))
-		return;
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+	memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
+	if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
+		yaffs_strcpy(obj->shortName, name);
+	else
+		obj->shortName[0] = _Y('\0');
+#endif
+	obj->sum = yaffs_CalcNameSum(name);
+}
 
-	/* Verify sane equivalent object */
+void yaffs_SetObjectNameFromOH(yaffs_Object *obj, const yaffs_ObjectHeader *oh)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	YCHAR tmpName[YAFFS_MAX_NAME_LENGTH+1];
+	memset(tmpName,0,sizeof(tmpName));
+	yaffs_LoadNameFromObjectHeader(obj->myDev,tmpName,oh->name,YAFFS_MAX_NAME_LENGTH+1);
+	yaffs_SetObjectName(obj,tmpName);
+#else
+	yaffs_SetObjectName(obj,oh->name);
+#endif
 }
 
-static void yaffs_VerifySymlink(yaffs_Object *obj)
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+
+
+yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
 {
-	if (obj && yaffs_SkipVerification(obj->myDev))
-		return;
+	yaffs_Tnode *tn = yaffs_AllocateRawTnode(dev);
+	if (tn){
+		memset(tn, 0, dev->tnodeSize);
+		dev->nTnodes++;
+	}
+
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 
-	/* Verify symlink string */
+	return tn;
 }
 
-static void yaffs_VerifySpecial(yaffs_Object *obj)
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
 {
-	if (obj && yaffs_SkipVerification(obj->myDev))
-		return;
+	yaffs_FreeRawTnode(dev,tn);
+	dev->nTnodes--;
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 }
 
-static void yaffs_VerifyObject(yaffs_Object *obj)
+static void yaffs_DeinitialiseTnodesAndObjects(yaffs_Device *dev)
 {
-	yaffs_Device *dev;
-
-	__u32 chunkMin;
-	__u32 chunkMax;
-
-	__u32 chunkIdOk;
-	__u32 chunkInRange;
-	__u32 chunkShouldNotBeDeleted;
-	__u32 chunkValid;
-
-	if (!obj)
-		return;
+	yaffs_DeinitialiseRawTnodesAndObjects(dev);
+	dev->nObjects = 0;
+	dev->nTnodes = 0;
+}
 
-	if (obj->beingCreated)
-		return;
 
-	dev = obj->myDev;
+void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
+		unsigned val)
+{
+	__u32 *map = (__u32 *)tn;
+	__u32 bitInMap;
+	__u32 bitInWord;
+	__u32 wordInMap;
+	__u32 mask;
 
-	if (yaffs_SkipVerification(dev))
-		return;
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
+	val >>= dev->chunkGroupBits;
 
-	/* Check sane object header chunk */
+	bitInMap = pos * dev->tnodeWidth;
+	wordInMap = bitInMap / 32;
+	bitInWord = bitInMap & (32 - 1);
 
-	chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
-	chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
+	mask = dev->tnodeMask << bitInWord;
 
-	chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
-	chunkIdOk = chunkInRange || obj->hdrChunk == 0;
-	chunkValid = chunkInRange &&
-			yaffs_CheckChunkBit(dev,
-					obj->hdrChunk / dev->nChunksPerBlock,
-					obj->hdrChunk % dev->nChunksPerBlock);
-	chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
+	map[wordInMap] &= ~mask;
+	map[wordInMap] |= (mask & (val << bitInWord));
 
-	if (!obj->fake &&
-			(!chunkIdOk || chunkShouldNotBeDeleted)) {
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
-			obj->objectId, obj->hdrChunk,
-			chunkIdOk ? "" : ",out of range",
-			chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
+	if (dev->tnodeWidth > (32 - bitInWord)) {
+		bitInWord = (32 - bitInWord);
+		wordInMap++;;
+		mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
+		map[wordInMap] &= ~mask;
+		map[wordInMap] |= (mask & (val >> bitInWord));
 	}
+}
 
-	if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
-		yaffs_ExtendedTags tags;
-		yaffs_ObjectHeader *oh;
-		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-		oh = (yaffs_ObjectHeader *)buffer;
+__u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
+		unsigned pos)
+{
+	__u32 *map = (__u32 *)tn;
+	__u32 bitInMap;
+	__u32 bitInWord;
+	__u32 wordInMap;
+	__u32 val;
 
-		yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
-				&tags);
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
 
-		yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
+	bitInMap = pos * dev->tnodeWidth;
+	wordInMap = bitInMap / 32;
+	bitInWord = bitInMap & (32 - 1);
 
-		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-	}
+	val = map[wordInMap] >> bitInWord;
 
-	/* Verify it has a parent */
-	if (obj && !obj->fake &&
-			(!obj->parent || obj->parent->myDev != dev)) {
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
-			obj->objectId, obj->parent));
+	if	(dev->tnodeWidth > (32 - bitInWord)) {
+		bitInWord = (32 - bitInWord);
+		wordInMap++;;
+		val |= (map[wordInMap] << bitInWord);
 	}
 
-	/* Verify parent is a directory */
-	if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
-			obj->objectId, obj->parent->variantType));
-	}
+	val &= dev->tnodeMask;
+	val <<= dev->chunkGroupBits;
 
-	switch (obj->variantType) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		yaffs_VerifyFile(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		yaffs_VerifySymlink(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		yaffs_VerifyDirectory(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		yaffs_VerifyHardLink(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-		yaffs_VerifySpecial(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_UNKNOWN:
-	default:
-		T(YAFFS_TRACE_VERIFY,
-		(TSTR("Obj %d has illegaltype %d"TENDSTR),
-		obj->objectId, obj->variantType));
-		break;
-	}
+	return val;
 }
 
-static void yaffs_VerifyObjects(yaffs_Device *dev)
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of topLevel
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
+					yaffs_FileStructure *fStruct,
+					__u32 chunkId)
 {
-	yaffs_Object *obj;
-	int i;
-	struct ylist_head *lh;
+	yaffs_Tnode *tn = fStruct->top;
+	__u32 i;
+	int requiredTallness;
+	int level = fStruct->topLevel;
 
-	if (yaffs_SkipVerification(dev))
-		return;
+	dev=dev;
 
-	/* Iterate through the objects in each hash entry */
+	/* Check sane level and chunk Id */
+	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+		return NULL;
 
-	for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
-		ylist_for_each(lh, &dev->objectBucket[i].list) {
-			if (lh) {
-				obj = ylist_entry(lh, yaffs_Object, hashLink);
-				yaffs_VerifyObject(obj);
-			}
-		}
+	if (chunkId > YAFFS_MAX_CHUNK_ID)
+		return NULL;
+
+	/* First check we're tall enough (ie enough topLevel) */
+
+	i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (i) {
+		i >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
 	}
-}
 
+	if (requiredTallness > fStruct->topLevel)
+		return NULL; /* Not tall enough, so we can't find it */
 
-/*
- *  Simple hash function. Needs to have a reasonable spread
- */
+	/* Traverse down to level 0 */
+	while (level > 0 && tn) {
+		tn = tn->internal[(chunkId >>
+			(YAFFS_TNODES_LEVEL0_BITS +
+				(level - 1) *
+				YAFFS_TNODES_INTERNAL_BITS)) &
+			YAFFS_TNODES_INTERNAL_MASK];
+		level--;
+	}
 
-static Y_INLINE int yaffs_HashFunction(int n)
-{
-	n = abs(n);
-	return n % YAFFS_NOBJECT_BUCKETS;
+	return tn;
 }
 
-/*
- * Access functions to useful fake objects.
- * Note that root might have a presence in NAND if permissions are set.
+/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
+ *  be plugged into the ttree.
  */
 
-yaffs_Object *yaffs_Root(yaffs_Device *dev)
+yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
+					yaffs_FileStructure *fStruct,
+					__u32 chunkId,
+					yaffs_Tnode *passedTn)
 {
-	return dev->rootDir;
-}
+	int requiredTallness;
+	int i;
+	int l;
+	yaffs_Tnode *tn;
 
-yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
-{
-	return dev->lostNFoundDir;
-}
+	__u32 x;
 
 
-/*
- *  Erased NAND checking functions
- */
+	/* Check sane level and page Id */
+	if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
+		return NULL;
 
-int yaffs_CheckFF(__u8 *buffer, int nBytes)
-{
-	/* Horrible, slow implementation */
-	while (nBytes--) {
-		if (*buffer != 0xFF)
-			return 0;
-		buffer++;
-	}
-	return 1;
-}
-
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
-				int chunkInNAND)
-{
-	int retval = YAFFS_OK;
-	__u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
-	yaffs_ExtendedTags tags;
-	int result;
-
-	result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
-
-	if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
-		retval = YAFFS_FAIL;
-
-	if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
-		T(YAFFS_TRACE_NANDACCESS,
-		  (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
-		retval = YAFFS_FAIL;
-	}
-
-	yaffs_ReleaseTempBuffer(dev, data, __LINE__);
-
-	return retval;
-
-}
-
-static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
-					const __u8 *data,
-					yaffs_ExtendedTags *tags,
-					int useReserve)
-{
-	int attempts = 0;
-	int writeOk = 0;
-	int chunk;
-
-	yaffs_InvalidateCheckpoint(dev);
-
-	do {
-		yaffs_BlockInfo *bi = 0;
-		int erasedOk = 0;
-
-		chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
-		if (chunk < 0) {
-			/* no space */
-			break;
-		}
-
-		/* First check this chunk is erased, if it needs
-		 * checking.  The checking policy (unless forced
-		 * always on) is as follows:
-		 *
-		 * Check the first page we try to write in a block.
-		 * If the check passes then we don't need to check any
-		 * more.	If the check fails, we check again...
-		 * If the block has been erased, we don't need to check.
-		 *
-		 * However, if the block has been prioritised for gc,
-		 * then we think there might be something odd about
-		 * this block and stop using it.
-		 *
-		 * Rationale: We should only ever see chunks that have
-		 * not been erased if there was a partially written
-		 * chunk due to power loss.  This checking policy should
-		 * catch that case with very few checks and thus save a
-		 * lot of checks that are most likely not needed.
-		 */
-		if (bi->gcPrioritise) {
-			yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
-			/* try another chunk */
-			continue;
-		}
-
-		/* let's give it a try */
-		attempts++;
-
-#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
-		bi->skipErasedCheck = 0;
-#endif
-		if (!bi->skipErasedCheck) {
-			erasedOk = yaffs_CheckChunkErased(dev, chunk);
-			if (erasedOk != YAFFS_OK) {
-				T(YAFFS_TRACE_ERROR,
-				(TSTR("**>> yaffs chunk %d was not erased"
-				TENDSTR), chunk));
-
-				/* try another chunk */
-				continue;
-			}
-			bi->skipErasedCheck = 1;
-		}
-
-		writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
-				data, tags);
-		if (writeOk != YAFFS_OK) {
-			yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
-			/* try another chunk */
-			continue;
-		}
-
-		/* Copy the data into the robustification buffer */
-		yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
-
-	} while (writeOk != YAFFS_OK &&
-		(yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
-
-	if (!writeOk)
-		chunk = -1;
-
-	if (attempts > 1) {
-		T(YAFFS_TRACE_ERROR,
-			(TSTR("**>> yaffs write required %d attempts" TENDSTR),
-			attempts));
-
-		dev->nRetriedWrites += (attempts - 1);
-	}
-
-	return chunk;
-}
-
-/*
- * Block retiring for handling a broken block.
- */
-
-static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
-{
-	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
-	yaffs_InvalidateCheckpoint(dev);
-
-	if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
-		if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
-			T(YAFFS_TRACE_ALWAYS, (TSTR(
-				"yaffs: Failed to mark bad and erase block %d"
-				TENDSTR), blockInNAND));
-		} else {
-			yaffs_ExtendedTags tags;
-			int chunkId = blockInNAND * dev->nChunksPerBlock;
-
-			__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-			memset(buffer, 0xff, dev->nDataBytesPerChunk);
-			yaffs_InitialiseTags(&tags);
-			tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
-			if (dev->writeChunkWithTagsToNAND(dev, chunkId -
-				dev->chunkOffset, buffer, &tags) != YAFFS_OK)
-				T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
-					TCONT("write bad block marker to block %d")
-					TENDSTR), blockInNAND));
-
-			yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-		}
-	}
-
-	bi->blockState = YAFFS_BLOCK_STATE_DEAD;
-	bi->gcPrioritise = 0;
-	bi->needsRetiring = 0;
-
-	dev->nRetiredBlocks++;
-}
-
-/*
- * Functions for robustisizing TODO
- *
- */
-
-static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
-				const __u8 *data,
-				const yaffs_ExtendedTags *tags)
-{
-}
-
-static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
-				const yaffs_ExtendedTags *tags)
-{
-}
-
-void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
-{
-	if (!bi->gcPrioritise) {
-		bi->gcPrioritise = 1;
-		dev->hasPendingPrioritisedGCs = 1;
-		bi->chunkErrorStrikes++;
-
-		if (bi->chunkErrorStrikes > 3) {
-			bi->needsRetiring = 1; /* Too many stikes, so retire this */
-			T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
-
-		}
-	}
-}
-
-static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
-		int erasedOk)
-{
-	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
-	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
-	yaffs_HandleChunkError(dev, bi);
-
-	if (erasedOk) {
-		/* Was an actual write failure, so mark the block for retirement  */
-		bi->needsRetiring = 1;
-		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-		  (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
-	}
-
-	/* Delete the chunk */
-	yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-}
-
-
-/*---------------- Name handling functions ------------*/
-
-static __u16 yaffs_CalcNameSum(const YCHAR *name)
-{
-	__u16 sum = 0;
-	__u16 i = 1;
-
-	const YUCHAR *bname = (const YUCHAR *) name;
-	if (bname) {
-		while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-			sum += yaffs_toupper(*bname) * i;
-#else
-			sum += (*bname) * i;
-#endif
-			i++;
-			bname++;
-		}
-	}
-	return sum;
-}
-
-static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
-{
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-	memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
-	if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
-		yaffs_strcpy(obj->shortName, name);
-	else
-		obj->shortName[0] = _Y('\0');
-#endif
-	obj->sum = yaffs_CalcNameSum(name);
-}
-
-/*-------------------- TNODES -------------------
-
- * List of spare tnodes
- * The list is hooked together using the first pointer
- * in the tnode.
- */
-
-/* yaffs_CreateTnodes creates a bunch more tnodes and
- * adds them to the tnode free list.
- * Don't use this function directly
- */
-
-static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
-{
-	int i;
-	int tnodeSize;
-	yaffs_Tnode *newTnodes;
-	__u8 *mem;
-	yaffs_Tnode *curr;
-	yaffs_Tnode *next;
-	yaffs_TnodeList *tnl;
-
-	if (nTnodes < 1)
-		return YAFFS_OK;
-
-	/* Calculate the tnode size in bytes for variable width tnode support.
-	 * Must be a multiple of 32-bits  */
-	tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-	if (tnodeSize < sizeof(yaffs_Tnode))
-		tnodeSize = sizeof(yaffs_Tnode);
-
-	/* make these things */
-
-	newTnodes = YMALLOC(nTnodes * tnodeSize);
-	mem = (__u8 *)newTnodes;
-
-	if (!newTnodes) {
-		T(YAFFS_TRACE_ERROR,
-			(TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	/* Hook them into the free list */
-#if 0
-	for (i = 0; i < nTnodes - 1; i++) {
-		newTnodes[i].internal[0] = &newTnodes[i + 1];
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-		newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-	}
-
-	newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-	newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-	dev->freeTnodes = newTnodes;
-#else
-	/* New hookup for wide tnodes */
-	for (i = 0; i < nTnodes - 1; i++) {
-		curr = (yaffs_Tnode *) &mem[i * tnodeSize];
-		next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
-		curr->internal[0] = next;
-	}
-
-	curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
-	curr->internal[0] = dev->freeTnodes;
-	dev->freeTnodes = (yaffs_Tnode *)mem;
-
-#endif
-
-
-	dev->nFreeTnodes += nTnodes;
-	dev->nTnodesCreated += nTnodes;
-
-	/* Now add this bunch of tnodes to a list for freeing up.
-	 * NB If we can't add this to the management list it isn't fatal
-	 * but it just means we can't free this bunch of tnodes later.
-	 */
-
-	tnl = YMALLOC(sizeof(yaffs_TnodeList));
-	if (!tnl) {
-		T(YAFFS_TRACE_ERROR,
-		  (TSTR
-		   ("yaffs: Could not add tnodes to management list" TENDSTR)));
-		   return YAFFS_FAIL;
-	} else {
-		tnl->tnodes = newTnodes;
-		tnl->next = dev->allocatedTnodeList;
-		dev->allocatedTnodeList = tnl;
-	}
-
-	T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
-
-	return YAFFS_OK;
-}
-
-/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
-
-static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
-{
-	yaffs_Tnode *tn = NULL;
-
-	/* If there are none left make more */
-	if (!dev->freeTnodes)
-		yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
-
-	if (dev->freeTnodes) {
-		tn = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-		if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
-			/* Hoosterman, this thing looks like it isn't in the list */
-			T(YAFFS_TRACE_ALWAYS,
-			  (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
-		}
-#endif
-		dev->freeTnodes = dev->freeTnodes->internal[0];
-		dev->nFreeTnodes--;
-	}
-
-	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-
-	return tn;
-}
-
-static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
-{
-	yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
-	int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-	if (tnodeSize < sizeof(yaffs_Tnode))
-		tnodeSize = sizeof(yaffs_Tnode);
-
-	if (tn)
-		memset(tn, 0, tnodeSize);
-
-	return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
-{
-	if (tn) {
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-		if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
-			/* Hoosterman, this thing looks like it is already in the list */
-			T(YAFFS_TRACE_ALWAYS,
-			  (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
-		}
-		tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-		tn->internal[0] = dev->freeTnodes;
-		dev->freeTnodes = tn;
-		dev->nFreeTnodes++;
-	}
-	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-}
-
-static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
-{
-	/* Free the list of allocated tnodes */
-	yaffs_TnodeList *tmp;
-
-	while (dev->allocatedTnodeList) {
-		tmp = dev->allocatedTnodeList->next;
-
-		YFREE(dev->allocatedTnodeList->tnodes);
-		YFREE(dev->allocatedTnodeList);
-		dev->allocatedTnodeList = tmp;
-
-	}
-
-	dev->freeTnodes = NULL;
-	dev->nFreeTnodes = 0;
-}
-
-static void yaffs_InitialiseTnodes(yaffs_Device *dev)
-{
-	dev->allocatedTnodeList = NULL;
-	dev->freeTnodes = NULL;
-	dev->nFreeTnodes = 0;
-	dev->nTnodesCreated = 0;
-}
-
-
-void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
-		unsigned val)
-{
-	__u32 *map = (__u32 *)tn;
-	__u32 bitInMap;
-	__u32 bitInWord;
-	__u32 wordInMap;
-	__u32 mask;
-
-	pos &= YAFFS_TNODES_LEVEL0_MASK;
-	val >>= dev->chunkGroupBits;
-
-	bitInMap = pos * dev->tnodeWidth;
-	wordInMap = bitInMap / 32;
-	bitInWord = bitInMap & (32 - 1);
-
-	mask = dev->tnodeMask << bitInWord;
-
-	map[wordInMap] &= ~mask;
-	map[wordInMap] |= (mask & (val << bitInWord));
-
-	if (dev->tnodeWidth > (32 - bitInWord)) {
-		bitInWord = (32 - bitInWord);
-		wordInMap++;;
-		mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
-		map[wordInMap] &= ~mask;
-		map[wordInMap] |= (mask & (val >> bitInWord));
-	}
-}
-
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
-		unsigned pos)
-{
-	__u32 *map = (__u32 *)tn;
-	__u32 bitInMap;
-	__u32 bitInWord;
-	__u32 wordInMap;
-	__u32 val;
-
-	pos &= YAFFS_TNODES_LEVEL0_MASK;
-
-	bitInMap = pos * dev->tnodeWidth;
-	wordInMap = bitInMap / 32;
-	bitInWord = bitInMap & (32 - 1);
-
-	val = map[wordInMap] >> bitInWord;
-
-	if	(dev->tnodeWidth > (32 - bitInWord)) {
-		bitInWord = (32 - bitInWord);
-		wordInMap++;;
-		val |= (map[wordInMap] << bitInWord);
-	}
-
-	val &= dev->tnodeMask;
-	val <<= dev->chunkGroupBits;
-
-	return val;
-}
-
-/* ------------------- End of individual tnode manipulation -----------------*/
-
-/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
- * The look up tree is represented by the top tnode and the number of topLevel
- * in the tree. 0 means only the level 0 tnode is in the tree.
- */
-
-/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
-					yaffs_FileStructure *fStruct,
-					__u32 chunkId)
-{
-	yaffs_Tnode *tn = fStruct->top;
-	__u32 i;
-	int requiredTallness;
-	int level = fStruct->topLevel;
-
-	/* Check sane level and chunk Id */
-	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
-		return NULL;
-
-	if (chunkId > YAFFS_MAX_CHUNK_ID)
-		return NULL;
-
-	/* First check we're tall enough (ie enough topLevel) */
-
-	i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
-	requiredTallness = 0;
-	while (i) {
-		i >>= YAFFS_TNODES_INTERNAL_BITS;
-		requiredTallness++;
-	}
-
-	if (requiredTallness > fStruct->topLevel)
-		return NULL; /* Not tall enough, so we can't find it */
-
-	/* Traverse down to level 0 */
-	while (level > 0 && tn) {
-		tn = tn->internal[(chunkId >>
-			(YAFFS_TNODES_LEVEL0_BITS +
-				(level - 1) *
-				YAFFS_TNODES_INTERNAL_BITS)) &
-			YAFFS_TNODES_INTERNAL_MASK];
-		level--;
-	}
-
-	return tn;
-}
-
-/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
- * This happens in two steps:
- *  1. If the tree isn't tall enough, then make it taller.
- *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
- *
- * Used when modifying the tree.
- *
- *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
- *  be plugged into the ttree.
- */
-
-static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
-					yaffs_FileStructure *fStruct,
-					__u32 chunkId,
-					yaffs_Tnode *passedTn)
-{
-	int requiredTallness;
-	int i;
-	int l;
-	yaffs_Tnode *tn;
-
-	__u32 x;
-
-
-	/* Check sane level and page Id */
-	if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
-		return NULL;
-
-	if (chunkId > YAFFS_MAX_CHUNK_ID)
-		return NULL;
-
-	/* First check we're tall enough (ie enough topLevel) */
-
-	x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
-	requiredTallness = 0;
-	while (x) {
-		x >>= YAFFS_TNODES_INTERNAL_BITS;
-		requiredTallness++;
-	}
-
-
-	if (requiredTallness > fStruct->topLevel) {
-		/* Not tall enough, gotta make the tree taller */
-		for (i = fStruct->topLevel; i < requiredTallness; i++) {
-
-			tn = yaffs_GetTnode(dev);
-
-			if (tn) {
-				tn->internal[0] = fStruct->top;
-				fStruct->top = tn;
-			} else {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR("yaffs: no more tnodes" TENDSTR)));
-			}
-		}
-
-		fStruct->topLevel = requiredTallness;
-	}
-
-	/* Traverse down to level 0, adding anything we need */
-
-	l = fStruct->topLevel;
-	tn = fStruct->top;
-
-	if (l > 0) {
-		while (l > 0 && tn) {
-			x = (chunkId >>
-			     (YAFFS_TNODES_LEVEL0_BITS +
-			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
-			    YAFFS_TNODES_INTERNAL_MASK;
-
-
-			if ((l > 1) && !tn->internal[x]) {
-				/* Add missing non-level-zero tnode */
-				tn->internal[x] = yaffs_GetTnode(dev);
-
-			} else if (l == 1) {
-				/* Looking from level 1 at level 0 */
-				if (passedTn) {
-					/* If we already have one, then release it.*/
-					if (tn->internal[x])
-						yaffs_FreeTnode(dev, tn->internal[x]);
-					tn->internal[x] = passedTn;
-
-				} else if (!tn->internal[x]) {
-					/* Don't have one, none passed in */
-					tn->internal[x] = yaffs_GetTnode(dev);
-				}
-			}
-
-			tn = tn->internal[x];
-			l--;
-		}
-	} else {
-		/* top is level 0 */
-		if (passedTn) {
-			memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
-			yaffs_FreeTnode(dev, passedTn);
-		}
-	}
-
-	return tn;
-}
-
-static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
-				yaffs_ExtendedTags *tags, int objectId,
-				int chunkInInode)
-{
-	int j;
-
-	for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
-		if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
-				theChunk % dev->nChunksPerBlock)) {
-			yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
-							tags);
-			if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
-				/* found it; */
-				return theChunk;
-			}
-		}
-		theChunk++;
-	}
-	return -1;
-}
-
-
-/* DeleteWorker scans backwards through the tnode tree and deletes all the
- * chunks and tnodes in the file
- * Returns 1 if the tree was deleted.
- * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
- */
-
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
-			      int chunkOffset, int *limit)
-{
-	int i;
-	int chunkInInode;
-	int theChunk;
-	yaffs_ExtendedTags tags;
-	int foundChunk;
-	yaffs_Device *dev = in->myDev;
-
-	int allDone = 1;
-
-	if (tn) {
-		if (level > 0) {
-			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
-			     i--) {
-				if (tn->internal[i]) {
-					if (limit && (*limit) < 0) {
-						allDone = 0;
-					} else {
-						allDone =
-							yaffs_DeleteWorker(in,
-								tn->
-								internal
-								[i],
-								level -
-								1,
-								(chunkOffset
-									<<
-									YAFFS_TNODES_INTERNAL_BITS)
-								+ i,
-								limit);
-					}
-					if (allDone) {
-						yaffs_FreeTnode(dev,
-								tn->
-								internal[i]);
-						tn->internal[i] = NULL;
-					}
-				}
-			}
-			return (allDone) ? 1 : 0;
-		} else if (level == 0) {
-			int hitLimit = 0;
-
-			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
-					i--) {
-				theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-				if (theChunk) {
-
-					chunkInInode = (chunkOffset <<
-						YAFFS_TNODES_LEVEL0_BITS) + i;
-
-					foundChunk =
-						yaffs_FindChunkInGroup(dev,
-								theChunk,
-								&tags,
-								in->objectId,
-								chunkInInode);
-
-					if (foundChunk > 0) {
-						yaffs_DeleteChunk(dev,
-								  foundChunk, 1,
-								  __LINE__);
-						in->nDataChunks--;
-						if (limit) {
-							*limit = *limit - 1;
-							if (*limit <= 0)
-								hitLimit = 1;
-						}
-
-					}
-
-					yaffs_PutLevel0Tnode(dev, tn, i, 0);
-				}
-
-			}
-			return (i < 0) ? 1 : 0;
-
-		}
-
-	}
-
-	return 1;
-
-}
-
-static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
-{
-	yaffs_BlockInfo *theBlock;
-
-	T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
-
-	theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
-	if (theBlock) {
-		theBlock->softDeletions++;
-		dev->nFreeChunks++;
-	}
-}
-
-/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
- * All soft deleting does is increment the block's softdelete count and pulls the chunk out
- * of the tnode.
- * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
- */
-
-static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
-				  __u32 level, int chunkOffset)
-{
-	int i;
-	int theChunk;
-	int allDone = 1;
-	yaffs_Device *dev = in->myDev;
-
-	if (tn) {
-		if (level > 0) {
-
-			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
-			     i--) {
-				if (tn->internal[i]) {
-					allDone =
-					    yaffs_SoftDeleteWorker(in,
-								   tn->
-								   internal[i],
-								   level - 1,
-								   (chunkOffset
-								    <<
-								    YAFFS_TNODES_INTERNAL_BITS)
-								   + i);
-					if (allDone) {
-						yaffs_FreeTnode(dev,
-								tn->
-								internal[i]);
-						tn->internal[i] = NULL;
-					} else {
-						/* Hoosterman... how could this happen? */
-					}
-				}
-			}
-			return (allDone) ? 1 : 0;
-		} else if (level == 0) {
-
-			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
-				theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-				if (theChunk) {
-					/* Note this does not find the real chunk, only the chunk group.
-					 * We make an assumption that a chunk group is not larger than
-					 * a block.
-					 */
-					yaffs_SoftDeleteChunk(dev, theChunk);
-					yaffs_PutLevel0Tnode(dev, tn, i, 0);
-				}
-
-			}
-			return 1;
-
-		}
-
-	}
-
-	return 1;
-
-}
-
-static void yaffs_SoftDeleteFile(yaffs_Object *obj)
-{
-	if (obj->deleted &&
-	    obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
-		if (obj->nDataChunks <= 0) {
-			/* Empty file with no duplicate object headers, just delete it immediately */
-			yaffs_FreeTnode(obj->myDev,
-					obj->variant.fileVariant.top);
-			obj->variant.fileVariant.top = NULL;
-			T(YAFFS_TRACE_TRACING,
-			  (TSTR("yaffs: Deleting empty file %d" TENDSTR),
-			   obj->objectId));
-			yaffs_DoGenericObjectDeletion(obj);
-		} else {
-			yaffs_SoftDeleteWorker(obj,
-					       obj->variant.fileVariant.top,
-					       obj->variant.fileVariant.
-					       topLevel, 0);
-			obj->softDeleted = 1;
-		}
-	}
-}
-
-/* Pruning removes any part of the file structure tree that is beyond the
- * bounds of the file (ie that does not point to chunks).
- *
- * A file should only get pruned when its size is reduced.
- *
- * Before pruning, the chunks must be pulled from the tree and the
- * level 0 tnode entries must be zeroed out.
- * Could also use this for file deletion, but that's probably better handled
- * by a special case.
- */
-
-static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
-				__u32 level, int del0)
-{
-	int i;
-	int hasData;
-
-	if (tn) {
-		hasData = 0;
-
-		for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
-			if (tn->internal[i] && level > 0) {
-				tn->internal[i] =
-				    yaffs_PruneWorker(dev, tn->internal[i],
-						      level - 1,
-						      (i == 0) ? del0 : 1);
-			}
-
-			if (tn->internal[i])
-				hasData++;
-		}
-
-		if (hasData == 0 && del0) {
-			/* Free and return NULL */
-
-			yaffs_FreeTnode(dev, tn);
-			tn = NULL;
-		}
-
-	}
-
-	return tn;
-
-}
-
-static int yaffs_PruneFileStructure(yaffs_Device *dev,
-				yaffs_FileStructure *fStruct)
-{
-	int i;
-	int hasData;
-	int done = 0;
-	yaffs_Tnode *tn;
-
-	if (fStruct->topLevel > 0) {
-		fStruct->top =
-		    yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
-
-		/* Now we have a tree with all the non-zero branches NULL but the height
-		 * is the same as it was.
-		 * Let's see if we can trim internal tnodes to shorten the tree.
-		 * We can do this if only the 0th element in the tnode is in use
-		 * (ie all the non-zero are NULL)
-		 */
-
-		while (fStruct->topLevel && !done) {
-			tn = fStruct->top;
-
-			hasData = 0;
-			for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
-				if (tn->internal[i])
-					hasData++;
-			}
-
-			if (!hasData) {
-				fStruct->top = tn->internal[0];
-				fStruct->topLevel--;
-				yaffs_FreeTnode(dev, tn);
-			} else {
-				done = 1;
-			}
-		}
-	}
-
-	return YAFFS_OK;
-}
-
-/*-------------------- End of File Structure functions.-------------------*/
-
-/* yaffs_CreateFreeObjects creates a bunch more objects and
- * adds them to the object free list.
- */
-static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
-{
-	int i;
-	yaffs_Object *newObjects;
-	yaffs_ObjectList *list;
-
-	if (nObjects < 1)
-		return YAFFS_OK;
-
-	/* make these things */
-	newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
-	list = YMALLOC(sizeof(yaffs_ObjectList));
-
-	if (!newObjects || !list) {
-		if (newObjects)
-			YFREE(newObjects);
-		if (list)
-			YFREE(list);
-		T(YAFFS_TRACE_ALLOCATE,
-		  (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
-		return YAFFS_FAIL;
-	}
-
-	/* Hook them into the free list */
-	for (i = 0; i < nObjects - 1; i++) {
-		newObjects[i].siblings.next =
-				(struct ylist_head *)(&newObjects[i + 1]);
-	}
-
-	newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
-	dev->freeObjects = newObjects;
-	dev->nFreeObjects += nObjects;
-	dev->nObjectsCreated += nObjects;
-
-	/* Now add this bunch of Objects to a list for freeing up. */
-
-	list->objects = newObjects;
-	list->next = dev->allocatedObjectList;
-	dev->allocatedObjectList = list;
-
-	return YAFFS_OK;
-}
-
-
-/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
-static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
-{
-	yaffs_Object *tn = NULL;
-
-#ifdef VALGRIND_TEST
-	tn = YMALLOC(sizeof(yaffs_Object));
-#else
-	/* If there are none left make more */
-	if (!dev->freeObjects)
-		yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
-
-	if (dev->freeObjects) {
-		tn = dev->freeObjects;
-		dev->freeObjects =
-			(yaffs_Object *) (dev->freeObjects->siblings.next);
-		dev->nFreeObjects--;
-	}
-#endif
-	if (tn) {
-		/* Now sweeten it up... */
-
-		memset(tn, 0, sizeof(yaffs_Object));
-		tn->beingCreated = 1;
-
-		tn->myDev = dev;
-		tn->hdrChunk = 0;
-		tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
-		YINIT_LIST_HEAD(&(tn->hardLinks));
-		YINIT_LIST_HEAD(&(tn->hashLink));
-		YINIT_LIST_HEAD(&tn->siblings);
-
-
-		/* Now make the directory sane */
-		if (dev->rootDir) {
-			tn->parent = dev->rootDir;
-			ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
-		}
-
-		/* Add it to the lost and found directory.
-		 * NB Can't put root or lostNFound in lostNFound so
-		 * check if lostNFound exists first
-		 */
-		if (dev->lostNFoundDir)
-			yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
-
-		tn->beingCreated = 0;
-	}
-
-	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-
-	return tn;
-}
-
-static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
-					       __u32 mode)
-{
-
-	yaffs_Object *obj =
-	    yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
-	if (obj) {
-		obj->fake = 1;		/* it is fake so it might have no NAND presence... */
-		obj->renameAllowed = 0;	/* ... and we're not allowed to rename it... */
-		obj->unlinkAllowed = 0;	/* ... or unlink it */
-		obj->deleted = 0;
-		obj->unlinked = 0;
-		obj->yst_mode = mode;
-		obj->myDev = dev;
-		obj->hdrChunk = 0;	/* Not a valid chunk. */
-	}
-
-	return obj;
-
-}
-
-static void yaffs_UnhashObject(yaffs_Object *tn)
-{
-	int bucket;
-	yaffs_Device *dev = tn->myDev;
-
-	/* If it is still linked into the bucket list, free from the list */
-	if (!ylist_empty(&tn->hashLink)) {
-		ylist_del_init(&tn->hashLink);
-		bucket = yaffs_HashFunction(tn->objectId);
-		dev->objectBucket[bucket].count--;
-	}
-}
-
-/*  FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_FreeObject(yaffs_Object *tn)
-{
-	yaffs_Device *dev = tn->myDev;
-
-#ifdef __KERNEL__
-	T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
-#endif
-
-	if (tn->parent)
-		YBUG();
-	if (!ylist_empty(&tn->siblings))
-		YBUG();
-
-
-#ifdef __KERNEL__
-	if (tn->myInode) {
-		/* We're still hooked up to a cached inode.
-		 * Don't delete now, but mark for later deletion
-		 */
-		tn->deferedFree = 1;
-		return;
-	}
-#endif
-
-	yaffs_UnhashObject(tn);
-
-#ifdef VALGRIND_TEST
-	YFREE(tn);
-#else
-	/* Link into the free list. */
-	tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
-	dev->freeObjects = tn;
-	dev->nFreeObjects++;
-#endif
-	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-}
-
-#ifdef __KERNEL__
-
-void yaffs_HandleDeferedFree(yaffs_Object *obj)
-{
-	if (obj->deferedFree)
-		yaffs_FreeObject(obj);
-}
-
-#endif
-
-static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
-{
-	/* Free the list of allocated Objects */
-
-	yaffs_ObjectList *tmp;
-
-	while (dev->allocatedObjectList) {
-		tmp = dev->allocatedObjectList->next;
-		YFREE(dev->allocatedObjectList->objects);
-		YFREE(dev->allocatedObjectList);
-
-		dev->allocatedObjectList = tmp;
-	}
-
-	dev->freeObjects = NULL;
-	dev->nFreeObjects = 0;
-}
-
-static void yaffs_InitialiseObjects(yaffs_Device *dev)
-{
-	int i;
-
-	dev->allocatedObjectList = NULL;
-	dev->freeObjects = NULL;
-	dev->nFreeObjects = 0;
-
-	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
-		YINIT_LIST_HEAD(&dev->objectBucket[i].list);
-		dev->objectBucket[i].count = 0;
-	}
-}
-
-static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
-{
-	static int x;
-	int i;
-	int l = 999;
-	int lowest = 999999;
-
-	/* First let's see if we can find one that's empty. */
-
-	for (i = 0; i < 10 && lowest > 0; i++) {
-		x++;
-		x %= YAFFS_NOBJECT_BUCKETS;
-		if (dev->objectBucket[x].count < lowest) {
-			lowest = dev->objectBucket[x].count;
-			l = x;
-		}
-
-	}
-
-	/* If we didn't find an empty list, then try
-	 * looking a bit further for a short one
-	 */
-
-	for (i = 0; i < 10 && lowest > 3; i++) {
-		x++;
-		x %= YAFFS_NOBJECT_BUCKETS;
-		if (dev->objectBucket[x].count < lowest) {
-			lowest = dev->objectBucket[x].count;
-			l = x;
-		}
-
-	}
-
-	return l;
-}
-
-static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
-{
-	int bucket = yaffs_FindNiceObjectBucket(dev);
-
-	/* Now find an object value that has not already been taken
-	 * by scanning the list.
-	 */
-
-	int found = 0;
-	struct ylist_head *i;
-
-	__u32 n = (__u32) bucket;
-
-	/* yaffs_CheckObjectHashSanity();  */
-
-	while (!found) {
-		found = 1;
-		n += YAFFS_NOBJECT_BUCKETS;
-		if (1 || dev->objectBucket[bucket].count > 0) {
-			ylist_for_each(i, &dev->objectBucket[bucket].list) {
-				/* If there is already one in the list */
-				if (i && ylist_entry(i, yaffs_Object,
-						hashLink)->objectId == n) {
-					found = 0;
-				}
-			}
-		}
-	}
-
-	return n;
-}
-
-static void yaffs_HashObject(yaffs_Object *in)
-{
-	int bucket = yaffs_HashFunction(in->objectId);
-	yaffs_Device *dev = in->myDev;
-
-	ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
-	dev->objectBucket[bucket].count++;
-}
-
-yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
-{
-	int bucket = yaffs_HashFunction(number);
-	struct ylist_head *i;
-	yaffs_Object *in;
-
-	ylist_for_each(i, &dev->objectBucket[bucket].list) {
-		/* Look if it is in the list */
-		if (i) {
-			in = ylist_entry(i, yaffs_Object, hashLink);
-			if (in->objectId == number) {
-#ifdef __KERNEL__
-				/* Don't tell the VFS about this one if it is defered free */
-				if (in->deferedFree)
-					return NULL;
-#endif
-
-				return in;
-			}
-		}
-	}
-
-	return NULL;
-}
-
-yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
-				    yaffs_ObjectType type)
-{
-	yaffs_Object *theObject;
-	yaffs_Tnode *tn = NULL;
-
-	if (number < 0)
-		number = yaffs_CreateNewObjectNumber(dev);
-
-	theObject = yaffs_AllocateEmptyObject(dev);
-	if (!theObject)
-		return NULL;
-
-	if (type == YAFFS_OBJECT_TYPE_FILE) {
-		tn = yaffs_GetTnode(dev);
-		if (!tn) {
-			yaffs_FreeObject(theObject);
-			return NULL;
-		}
-	}
-
-	if (theObject) {
-		theObject->fake = 0;
-		theObject->renameAllowed = 1;
-		theObject->unlinkAllowed = 1;
-		theObject->objectId = number;
-		yaffs_HashObject(theObject);
-		theObject->variantType = type;
-#ifdef CONFIG_YAFFS_WINCE
-		yfsd_WinFileTimeNow(theObject->win_atime);
-		theObject->win_ctime[0] = theObject->win_mtime[0] =
-		    theObject->win_atime[0];
-		theObject->win_ctime[1] = theObject->win_mtime[1] =
-		    theObject->win_atime[1];
-
-#else
-
-		theObject->yst_atime = theObject->yst_mtime =
-		    theObject->yst_ctime = Y_CURRENT_TIME;
-#endif
-		switch (type) {
-		case YAFFS_OBJECT_TYPE_FILE:
-			theObject->variant.fileVariant.fileSize = 0;
-			theObject->variant.fileVariant.scannedFileSize = 0;
-			theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF;	/* max __u32 */
-			theObject->variant.fileVariant.topLevel = 0;
-			theObject->variant.fileVariant.top = tn;
-			break;
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
-					children);
-			break;
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-			/* No action required */
-			break;
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-			/* todo this should not happen */
-			break;
-		}
-	}
-
-	return theObject;
-}
-
-static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
-						      int number,
-						      yaffs_ObjectType type)
-{
-	yaffs_Object *theObject = NULL;
-
-	if (number > 0)
-		theObject = yaffs_FindObjectByNumber(dev, number);
-
-	if (!theObject)
-		theObject = yaffs_CreateNewObject(dev, number, type);
-
-	return theObject;
-
-}
-
-
-static YCHAR *yaffs_CloneString(const YCHAR *str)
-{
-	YCHAR *newStr = NULL;
-
-	if (str && *str) {
-		newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
-		if (newStr)
-			yaffs_strcpy(newStr, str);
-	}
-
-	return newStr;
-
-}
-
-/*
- * Mknod (create) a new object.
- * equivalentObject only has meaning for a hard link;
- * aliasString only has meaning for a sumlink.
- * rdev only has meaning for devices (a subset of special objects)
- */
-
-static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
-				       yaffs_Object *parent,
-				       const YCHAR *name,
-				       __u32 mode,
-				       __u32 uid,
-				       __u32 gid,
-				       yaffs_Object *equivalentObject,
-				       const YCHAR *aliasString, __u32 rdev)
-{
-	yaffs_Object *in;
-	YCHAR *str = NULL;
-
-	yaffs_Device *dev = parent->myDev;
-
-	/* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
-	if (yaffs_FindObjectByName(parent, name))
-		return NULL;
-
-	in = yaffs_CreateNewObject(dev, -1, type);
-
-	if (!in)
-		return YAFFS_FAIL;
-
-	if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
-		str = yaffs_CloneString(aliasString);
-		if (!str) {
-			yaffs_FreeObject(in);
-			return NULL;
-		}
-	}
-
-
-
-	if (in) {
-		in->hdrChunk = 0;
-		in->valid = 1;
-		in->variantType = type;
-
-		in->yst_mode = mode;
-
-#ifdef CONFIG_YAFFS_WINCE
-		yfsd_WinFileTimeNow(in->win_atime);
-		in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
-		in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
-
-#else
-		in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
-
-		in->yst_rdev = rdev;
-		in->yst_uid = uid;
-		in->yst_gid = gid;
-#endif
-		in->nDataChunks = 0;
-
-		yaffs_SetObjectName(in, name);
-		in->dirty = 1;
-
-		yaffs_AddObjectToDirectory(parent, in);
-
-		in->myDev = parent->myDev;
-
-		switch (type) {
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-			in->variant.symLinkVariant.alias = str;
-			break;
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-			in->variant.hardLinkVariant.equivalentObject =
-				equivalentObject;
-			in->variant.hardLinkVariant.equivalentObjectId =
-				equivalentObject->objectId;
-			ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
-			break;
-		case YAFFS_OBJECT_TYPE_FILE:
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-			/* do nothing */
-			break;
-		}
-
-		if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
-			/* Could not create the object header, fail the creation */
-			yaffs_DeleteObject(in);
-			in = NULL;
-		}
-
-	}
-
-	return in;
-}
-
-yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
-			__u32 mode, __u32 uid, __u32 gid)
-{
-	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
-				uid, gid, NULL, NULL, 0);
-}
-
-yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
-				__u32 mode, __u32 uid, __u32 gid)
-{
-	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
-				 mode, uid, gid, NULL, NULL, 0);
-}
-
-yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
-				__u32 mode, __u32 uid, __u32 gid, __u32 rdev)
-{
-	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
-				 uid, gid, NULL, NULL, rdev);
-}
-
-yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
-				__u32 mode, __u32 uid, __u32 gid,
-				const YCHAR *alias)
-{
-	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
-				uid, gid, NULL, alias, 0);
-}
-
-/* yaffs_Link returns the object id of the equivalent object.*/
-yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
-			yaffs_Object *equivalentObject)
-{
-	/* Get the real object in case we were fed a hard link as an equivalent object */
-	equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
-
-	if (yaffs_MknodObject
-	    (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
-	     equivalentObject, NULL, 0)) {
-		return equivalentObject;
-	} else {
-		return NULL;
-	}
-
-}
-
-static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
-				const YCHAR *newName, int force, int shadows)
-{
-	int unlinkOp;
-	int deleteOp;
-
-	yaffs_Object *existingTarget;
-
-	if (newDir == NULL)
-		newDir = obj->parent;	/* use the old directory */
-
-	if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR
-		   ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
-		    TENDSTR)));
-		YBUG();
-	}
-
-	/* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
-	if (obj->myDev->isYaffs2)
-		unlinkOp = (newDir == obj->myDev->unlinkedDir);
-	else
-		unlinkOp = (newDir == obj->myDev->unlinkedDir
-			    && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
-
-	deleteOp = (newDir == obj->myDev->deletedDir);
-
-	existingTarget = yaffs_FindObjectByName(newDir, newName);
-
-	/* If the object is a file going into the unlinked directory,
-	 *   then it is OK to just stuff it in since duplicate names are allowed.
-	 *   else only proceed if the new name does not exist and if we're putting
-	 *   it into a directory.
-	 */
-	if ((unlinkOp ||
-	     deleteOp ||
-	     force ||
-	     (shadows > 0) ||
-	     !existingTarget) &&
-	    newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
-		yaffs_SetObjectName(obj, newName);
-		obj->dirty = 1;
-
-		yaffs_AddObjectToDirectory(newDir, obj);
-
-		if (unlinkOp)
-			obj->unlinked = 1;
-
-		/* If it is a deletion then we mark it as a shrink for gc purposes. */
-		if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
-			return YAFFS_OK;
-	}
-
-	return YAFFS_FAIL;
-}
-
-int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
-		yaffs_Object *newDir, const YCHAR *newName)
-{
-	yaffs_Object *obj = NULL;
-	yaffs_Object *existingTarget = NULL;
-	int force = 0;
-
-
-	if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
-		YBUG();
-	if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
-		YBUG();
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-	/* Special case for case insemsitive systems (eg. WinCE).
-	 * While look-up is case insensitive, the name isn't.
-	 * Therefore we might want to change x.txt to X.txt
-	*/
-	if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
-		force = 1;
-#endif
-
-	else if (yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
-		/* ENAMETOOLONG */
-		return YAFFS_FAIL;
-
-	obj = yaffs_FindObjectByName(oldDir, oldName);
-
-	if (obj && obj->renameAllowed) {
-
-		/* Now do the handling for an existing target, if there is one */
-
-		existingTarget = yaffs_FindObjectByName(newDir, newName);
-		if (existingTarget &&
-			existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
-			!ylist_empty(&existingTarget->variant.directoryVariant.children)) {
-			/* There is a target that is a non-empty directory, so we fail */
-			return YAFFS_FAIL;	/* EEXIST or ENOTEMPTY */
-		} else if (existingTarget && existingTarget != obj) {
-			/* Nuke the target first, using shadowing,
-			 * but only if it isn't the same object
-			 */
-			yaffs_ChangeObjectName(obj, newDir, newName, force,
-						existingTarget->objectId);
-			yaffs_UnlinkObject(existingTarget);
-		}
-
-		return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
-	}
-	return YAFFS_FAIL;
-}
-
-/*------------------------- Block Management and Page Allocation ----------------*/
-
-static int yaffs_InitialiseBlocks(yaffs_Device *dev)
-{
-	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
-	dev->blockInfo = NULL;
-	dev->chunkBits = NULL;
-
-	dev->allocationBlock = -1;	/* force it to get a new one */
-
-	/* If the first allocation strategy fails, thry the alternate one */
-	dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
-	if (!dev->blockInfo) {
-		dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
-		dev->blockInfoAlt = 1;
-	} else
-		dev->blockInfoAlt = 0;
-
-	if (dev->blockInfo) {
-		/* Set up dynamic blockinfo stuff. */
-		dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
-		dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
-		if (!dev->chunkBits) {
-			dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
-			dev->chunkBitsAlt = 1;
-		} else
-			dev->chunkBitsAlt = 0;
-	}
-
-	if (dev->blockInfo && dev->chunkBits) {
-		memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
-		memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
-		return YAFFS_OK;
-	}
-
-	return YAFFS_FAIL;
-}
-
-static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
-{
-	if (dev->blockInfoAlt && dev->blockInfo)
-		YFREE_ALT(dev->blockInfo);
-	else if (dev->blockInfo)
-		YFREE(dev->blockInfo);
-
-	dev->blockInfoAlt = 0;
-
-	dev->blockInfo = NULL;
-
-	if (dev->chunkBitsAlt && dev->chunkBits)
-		YFREE_ALT(dev->chunkBits);
-	else if (dev->chunkBits)
-		YFREE(dev->chunkBits);
-	dev->chunkBitsAlt = 0;
-	dev->chunkBits = NULL;
-}
-
-static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
-					yaffs_BlockInfo *bi)
-{
-	int i;
-	__u32 seq;
-	yaffs_BlockInfo *b;
-
-	if (!dev->isYaffs2)
-		return 1;	/* disqualification only applies to yaffs2. */
-
-	if (!bi->hasShrinkHeader)
-		return 1;	/* can gc */
-
-	/* Find the oldest dirty sequence number if we don't know it and save it
-	 * so we don't have to keep recomputing it.
-	 */
-	if (!dev->oldestDirtySequence) {
-		seq = dev->sequenceNumber;
-
-		for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
-				i++) {
-			b = yaffs_GetBlockInfo(dev, i);
-			if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
-			    (b->pagesInUse - b->softDeletions) <
-			    dev->nChunksPerBlock && b->sequenceNumber < seq) {
-				seq = b->sequenceNumber;
-			}
-		}
-		dev->oldestDirtySequence = seq;
-	}
-
-	/* Can't do gc of this block if there are any blocks older than this one that have
-	 * discarded pages.
-	 */
-	return (bi->sequenceNumber <= dev->oldestDirtySequence);
-}
-
-/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
- * for garbage collection.
- */
-
-static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
-					int aggressive)
-{
-	int b = dev->currentDirtyChecker;
-
-	int i;
-	int iterations;
-	int dirtiest = -1;
-	int pagesInUse = 0;
-	int prioritised = 0;
-	yaffs_BlockInfo *bi;
-	int pendingPrioritisedExist = 0;
-
-	/* First let's see if we need to grab a prioritised block */
-	if (dev->hasPendingPrioritisedGCs) {
-		for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
-
-			bi = yaffs_GetBlockInfo(dev, i);
-			/* yaffs_VerifyBlock(dev,bi,i); */
-
-			if (bi->gcPrioritise) {
-				pendingPrioritisedExist = 1;
-				if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-				   yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
-					pagesInUse = (bi->pagesInUse - bi->softDeletions);
-					dirtiest = i;
-					prioritised = 1;
-					aggressive = 1; /* Fool the non-aggressive skip logiv below */
-				}
-			}
-		}
-
-		if (!pendingPrioritisedExist) /* None found, so we can clear this */
-			dev->hasPendingPrioritisedGCs = 0;
-	}
-
-	/* If we're doing aggressive GC then we are happy to take a less-dirty block, and
-	 * search harder.
-	 * else (we're doing a leasurely gc), then we only bother to do this if the
-	 * block has only a few pages in use.
-	 */
-
-	dev->nonAggressiveSkip--;
-
-	if (!aggressive && (dev->nonAggressiveSkip > 0))
-		return -1;
-
-	if (!prioritised)
-		pagesInUse =
-			(aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
-
-	if (aggressive)
-		iterations =
-		    dev->internalEndBlock - dev->internalStartBlock + 1;
-	else {
-		iterations =
-		    dev->internalEndBlock - dev->internalStartBlock + 1;
-		iterations = iterations / 16;
-		if (iterations > 200)
-			iterations = 200;
-	}
-
-	for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
-		b++;
-		if (b < dev->internalStartBlock || b > dev->internalEndBlock)
-			b = dev->internalStartBlock;
-
-		if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
-			T(YAFFS_TRACE_ERROR,
-			  (TSTR("**>> Block %d is not valid" TENDSTR), b));
-			YBUG();
-		}
-
-		bi = yaffs_GetBlockInfo(dev, b);
-
-		if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-			(bi->pagesInUse - bi->softDeletions) < pagesInUse &&
-				yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
-			dirtiest = b;
-			pagesInUse = (bi->pagesInUse - bi->softDeletions);
-		}
-	}
-
-	dev->currentDirtyChecker = b;
-
-	if (dirtiest > 0) {
-		T(YAFFS_TRACE_GC,
-		  (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
-		   dev->nChunksPerBlock - pagesInUse, prioritised));
-	}
-
-	dev->oldestDirtySequence = 0;
-
-	if (dirtiest > 0)
-		dev->nonAggressiveSkip = 4;
-
-	return dirtiest;
-}
-
-static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
-{
-	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
-
-	int erasedOk = 0;
-
-	/* If the block is still healthy erase it and mark as clean.
-	 * If the block has had a data failure, then retire it.
-	 */
-
-	T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
-		(TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
-		blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
-
-	bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
-
-	if (!bi->needsRetiring) {
-		yaffs_InvalidateCheckpoint(dev);
-		erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
-		if (!erasedOk) {
-			dev->nErasureFailures++;
-			T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-			  (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
-		}
-	}
-
-	if (erasedOk &&
-	    ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
-		int i;
-		for (i = 0; i < dev->nChunksPerBlock; i++) {
-			if (!yaffs_CheckChunkErased
-			    (dev, blockNo * dev->nChunksPerBlock + i)) {
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   (">>Block %d erasure supposedly OK, but chunk %d not erased"
-				    TENDSTR), blockNo, i));
-			}
-		}
-	}
-
-	if (erasedOk) {
-		/* Clean it up... */
-		bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
-		dev->nErasedBlocks++;
-		bi->pagesInUse = 0;
-		bi->softDeletions = 0;
-		bi->hasShrinkHeader = 0;
-		bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
-		bi->gcPrioritise = 0;
-		yaffs_ClearChunkBits(dev, blockNo);
-
-		T(YAFFS_TRACE_ERASE,
-		  (TSTR("Erased block %d" TENDSTR), blockNo));
-	} else {
-		dev->nFreeChunks -= dev->nChunksPerBlock;	/* We lost a block of free space */
-
-		yaffs_RetireBlock(dev, blockNo);
-		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-		  (TSTR("**>> Block %d retired" TENDSTR), blockNo));
-	}
-}
-
-static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
-{
-	int i;
-
-	yaffs_BlockInfo *bi;
-
-	if (dev->nErasedBlocks < 1) {
-		/* Hoosterman we've got a problem.
-		 * Can't get space to gc
-		 */
-		T(YAFFS_TRACE_ERROR,
-		  (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
-
-		return -1;
-	}
-
-	/* Find an empty block. */
-
-	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-		dev->allocationBlockFinder++;
-		if (dev->allocationBlockFinder < dev->internalStartBlock
-		    || dev->allocationBlockFinder > dev->internalEndBlock) {
-			dev->allocationBlockFinder = dev->internalStartBlock;
-		}
-
-		bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
-
-		if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
-			bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
-			dev->sequenceNumber++;
-			bi->sequenceNumber = dev->sequenceNumber;
-			dev->nErasedBlocks--;
-			T(YAFFS_TRACE_ALLOCATE,
-			  (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
-			   dev->allocationBlockFinder, dev->sequenceNumber,
-			   dev->nErasedBlocks));
-			return dev->allocationBlockFinder;
-		}
-	}
-
-	T(YAFFS_TRACE_ALWAYS,
-	  (TSTR
-	   ("yaffs tragedy: no more erased blocks, but there should have been %d"
-	    TENDSTR), dev->nErasedBlocks));
-
-	return -1;
-}
-
-
-
-static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
-{
-	if (!dev->nCheckpointBlocksRequired &&
-	   dev->isYaffs2) {
-		/* Not a valid value so recalculate */
-		int nBytes = 0;
-		int nBlocks;
-		int devBlocks = (dev->endBlock - dev->startBlock + 1);
-		int tnodeSize;
-
-		tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-		if (tnodeSize < sizeof(yaffs_Tnode))
-			tnodeSize = sizeof(yaffs_Tnode);
-
-		nBytes += sizeof(yaffs_CheckpointValidity);
-		nBytes += sizeof(yaffs_CheckpointDevice);
-		nBytes += devBlocks * sizeof(yaffs_BlockInfo);
-		nBytes += devBlocks * dev->chunkBitmapStride;
-		nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
-		nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
-		nBytes += sizeof(yaffs_CheckpointValidity);
-		nBytes += sizeof(__u32); /* checksum*/
-
-		/* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
-
-		nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
-
-		dev->nCheckpointBlocksRequired = nBlocks;
-	}
-
-	return dev->nCheckpointBlocksRequired;
-}
-
-/*
- * Check if there's space to allocate...
- * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
- */
-static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
-{
-	int reservedChunks;
-	int reservedBlocks = dev->nReservedBlocks;
-	int checkpointBlocks;
-
-	if (dev->isYaffs2) {
-		checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
-				    dev->blocksInCheckpoint;
-		if (checkpointBlocks < 0)
-			checkpointBlocks = 0;
-	} else {
-		checkpointBlocks = 0;
-	}
-
-	reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
-
-	return (dev->nFreeChunks > reservedChunks);
-}
-
-static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
-		yaffs_BlockInfo **blockUsedPtr)
-{
-	int retVal;
-	yaffs_BlockInfo *bi;
-
-	if (dev->allocationBlock < 0) {
-		/* Get next block to allocate off */
-		dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
-		dev->allocationPage = 0;
-	}
-
-	if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
-		/* Not enough space to allocate unless we're allowed to use the reserve. */
-		return -1;
-	}
-
-	if (dev->nErasedBlocks < dev->nReservedBlocks
-			&& dev->allocationPage == 0) {
-		T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
-	}
-
-	/* Next page please.... */
-	if (dev->allocationBlock >= 0) {
-		bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
-
-		retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
-			dev->allocationPage;
-		bi->pagesInUse++;
-		yaffs_SetChunkBit(dev, dev->allocationBlock,
-				dev->allocationPage);
-
-		dev->allocationPage++;
-
-		dev->nFreeChunks--;
-
-		/* If the block is full set the state to full */
-		if (dev->allocationPage >= dev->nChunksPerBlock) {
-			bi->blockState = YAFFS_BLOCK_STATE_FULL;
-			dev->allocationBlock = -1;
-		}
-
-		if (blockUsedPtr)
-			*blockUsedPtr = bi;
-
-		return retVal;
-	}
-
-	T(YAFFS_TRACE_ERROR,
-			(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
-
-	return -1;
-}
-
-static int yaffs_GetErasedChunks(yaffs_Device *dev)
-{
-	int n;
-
-	n = dev->nErasedBlocks * dev->nChunksPerBlock;
-
-	if (dev->allocationBlock > 0)
-		n += (dev->nChunksPerBlock - dev->allocationPage);
-
-	return n;
-
-}
-
-static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
-		int wholeBlock)
-{
-	int oldChunk;
-	int newChunk;
-	int markNAND;
-	int retVal = YAFFS_OK;
-	int cleanups = 0;
-	int i;
-	int isCheckpointBlock;
-	int matchingChunk;
-	int maxCopies;
-
-	int chunksBefore = yaffs_GetErasedChunks(dev);
-	int chunksAfter;
-
-	yaffs_ExtendedTags tags;
-
-	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
-
-	yaffs_Object *object;
-
-	isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
-
-	bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
-
-	T(YAFFS_TRACE_TRACING,
-			(TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
-			 block,
-			 bi->pagesInUse,
-			 bi->hasShrinkHeader,
-			 wholeBlock));
-
-	/*yaffs_VerifyFreeChunks(dev); */
-
-	bi->hasShrinkHeader = 0;	/* clear the flag so that the block can erase */
-
-	/* Take off the number of soft deleted entries because
-	 * they're going to get really deleted during GC.
-	 */
-	dev->nFreeChunks -= bi->softDeletions;
-
-	dev->isDoingGC = 1;
-
-	if (isCheckpointBlock ||
-			!yaffs_StillSomeChunkBits(dev, block)) {
-		T(YAFFS_TRACE_TRACING,
-				(TSTR
-				 ("Collecting block %d that has no chunks in use" TENDSTR),
-				 block));
-		yaffs_BlockBecameDirty(dev, block);
-	} else {
-
-		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-		yaffs_VerifyBlock(dev, bi, block);
-
-		maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
-		oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
-
-		for (/* init already done */;
-		     retVal == YAFFS_OK &&
-		     dev->gcChunk < dev->nChunksPerBlock &&
-		     (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
-		     maxCopies > 0;
-		     dev->gcChunk++, oldChunk++) {
-			if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
-
-				/* This page is in use and might need to be copied off */
-
-				maxCopies--;
-
-				markNAND = 1;
-
-				yaffs_InitialiseTags(&tags);
-
-				yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
-								buffer, &tags);
-
-				object =
-				    yaffs_FindObjectByNumber(dev,
-							     tags.objectId);
-
-				T(YAFFS_TRACE_GC_DETAIL,
-				  (TSTR
-				   ("Collecting chunk in block %d, %d %d %d " TENDSTR),
-				   dev->gcChunk, tags.objectId, tags.chunkId,
-				   tags.byteCount));
-
-				if (object && !yaffs_SkipVerification(dev)) {
-					if (tags.chunkId == 0)
-						matchingChunk = object->hdrChunk;
-					else if (object->softDeleted)
-						matchingChunk = oldChunk; /* Defeat the test */
-					else
-						matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
-
-					if (oldChunk != matchingChunk)
-						T(YAFFS_TRACE_ERROR,
-						  (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
-						  oldChunk, matchingChunk, tags.objectId, tags.chunkId));
-
-				}
-
-				if (!object) {
-					T(YAFFS_TRACE_ERROR,
-					  (TSTR
-					   ("page %d in gc has no object: %d %d %d "
-					    TENDSTR), oldChunk,
-					    tags.objectId, tags.chunkId, tags.byteCount));
-				}
-
-				if (object &&
-				    object->deleted &&
-				    object->softDeleted &&
-				    tags.chunkId != 0) {
-					/* Data chunk in a soft deleted file, throw it away
-					 * It's a soft deleted data chunk,
-					 * No need to copy this, just forget about it and
-					 * fix up the object.
-					 */
-
-					object->nDataChunks--;
-
-					if (object->nDataChunks <= 0) {
-						/* remeber to clean up the object */
-						dev->gcCleanupList[cleanups] =
-						    tags.objectId;
-						cleanups++;
-					}
-					markNAND = 0;
-				} else if (0) {
-					/* Todo object && object->deleted && object->nDataChunks == 0 */
-					/* Deleted object header with no data chunks.
-					 * Can be discarded and the file deleted.
-					 */
-					object->hdrChunk = 0;
-					yaffs_FreeTnode(object->myDev,
-							object->variant.
-							fileVariant.top);
-					object->variant.fileVariant.top = NULL;
-					yaffs_DoGenericObjectDeletion(object);
-
-				} else if (object) {
-					/* It's either a data chunk in a live file or
-					 * an ObjectHeader, so we're interested in it.
-					 * NB Need to keep the ObjectHeaders of deleted files
-					 * until the whole file has been deleted off
-					 */
-					tags.serialNumber++;
-
-					dev->nGCCopies++;
-
-					if (tags.chunkId == 0) {
-						/* It is an object Id,
-						 * We need to nuke the shrinkheader flags first
-						 * We no longer want the shrinkHeader flag since its work is done
-						 * and if it is left in place it will mess up scanning.
-						 */
-
-						yaffs_ObjectHeader *oh;
-						oh = (yaffs_ObjectHeader *)buffer;
-						oh->isShrink = 0;
-						tags.extraIsShrinkHeader = 0;
-
-						yaffs_VerifyObjectHeader(object, oh, &tags, 1);
-					}
-
-					newChunk =
-					    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
-
-					if (newChunk < 0) {
-						retVal = YAFFS_FAIL;
-					} else {
-
-						/* Ok, now fix up the Tnodes etc. */
-
-						if (tags.chunkId == 0) {
-							/* It's a header */
-							object->hdrChunk =  newChunk;
-							object->serial =   tags.serialNumber;
-						} else {
-							/* It's a data chunk */
-							yaffs_PutChunkIntoFile
-							    (object,
-							     tags.chunkId,
-							     newChunk, 0);
-						}
-					}
-				}
-
-				if (retVal == YAFFS_OK)
-					yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
-
-			}
-		}
-
-		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
-
-		/* Do any required cleanups */
-		for (i = 0; i < cleanups; i++) {
-			/* Time to delete the file too */
-			object =
-			    yaffs_FindObjectByNumber(dev,
-						     dev->gcCleanupList[i]);
-			if (object) {
-				yaffs_FreeTnode(dev,
-						object->variant.fileVariant.
-						top);
-				object->variant.fileVariant.top = NULL;
-				T(YAFFS_TRACE_GC,
-				  (TSTR
-				   ("yaffs: About to finally delete object %d"
-				    TENDSTR), object->objectId));
-				yaffs_DoGenericObjectDeletion(object);
-				object->myDev->nDeletedFiles--;
-			}
-
-		}
-
-	}
-
-	yaffs_VerifyCollectedBlock(dev, bi, block);
+	if (chunkId > YAFFS_MAX_CHUNK_ID)
+		return NULL;
 
-	chunksAfter = yaffs_GetErasedChunks(dev);
-	if (chunksBefore >= chunksAfter) {
-		T(YAFFS_TRACE_GC,
-		  (TSTR
-		   ("gc did not increase free chunks before %d after %d"
-		    TENDSTR), chunksBefore, chunksAfter));
-	}
+	/* First check we're tall enough (ie enough topLevel) */
 
-	/* If the gc completed then clear the current gcBlock so that we find another. */
-	if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
-		dev->gcBlock = -1;
-		dev->gcChunk = 0;
+	x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (x) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
 	}
 
-	dev->isDoingGC = 0;
-
-	return retVal;
-}
 
-/* New garbage collector
- * If we're very low on erased blocks then we do aggressive garbage collection
- * otherwise we do "leasurely" garbage collection.
- * Aggressive gc looks further (whole array) and will accept less dirty blocks.
- * Passive gc only inspects smaller areas and will only accept more dirty blocks.
- *
- * The idea is to help clear out space in a more spread-out manner.
- * Dunno if it really does anything useful.
- */
-static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
-{
-	int block;
-	int aggressive;
-	int gcOk = YAFFS_OK;
-	int maxTries = 0;
+	if (requiredTallness > fStruct->topLevel) {
+		/* Not tall enough, gotta make the tree taller */
+		for (i = fStruct->topLevel; i < requiredTallness; i++) {
 
-	int checkpointBlockAdjust;
+			tn = yaffs_GetTnode(dev);
 
-	if (dev->isDoingGC) {
-		/* Bail out so we don't get recursive gc */
-		return YAFFS_OK;
+			if (tn) {
+				tn->internal[0] = fStruct->top;
+				fStruct->top = tn;
+				fStruct->topLevel++;
+			} else {
+				T(YAFFS_TRACE_ERROR,
+					(TSTR("yaffs: no more tnodes" TENDSTR)));
+				return NULL;
+			}
+		}
 	}
 
-	/* This loop should pass the first time.
-	 * We'll only see looping here if the erase of the collected block fails.
-	 */
-
-	do {
-		maxTries++;
-
-		checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
-		if (checkpointBlockAdjust < 0)
-			checkpointBlockAdjust = 0;
+	/* Traverse down to level 0, adding anything we need */
 
-		if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
-			/* We need a block soon...*/
-			aggressive = 1;
-		} else {
-			/* We're in no hurry */
-			aggressive = 0;
-		}
+	l = fStruct->topLevel;
+	tn = fStruct->top;
 
-		if (dev->gcBlock <= 0) {
-			dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
-			dev->gcChunk = 0;
-		}
+	if (l > 0) {
+		while (l > 0 && tn) {
+			x = (chunkId >>
+			     (YAFFS_TNODES_LEVEL0_BITS +
+			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+			    YAFFS_TNODES_INTERNAL_MASK;
 
-		block = dev->gcBlock;
 
-		if (block > 0) {
-			dev->garbageCollections++;
-			if (!aggressive)
-				dev->passiveGarbageCollections++;
+			if ((l > 1) && !tn->internal[x]) {
+				/* Add missing non-level-zero tnode */
+				tn->internal[x] = yaffs_GetTnode(dev);
+				if(!tn->internal[x])
+					return NULL;
+			} else if (l == 1) {
+				/* Looking from level 1 at level 0 */
+				if (passedTn) {
+					/* If we already have one, then release it.*/
+					if (tn->internal[x])
+						yaffs_FreeTnode(dev, tn->internal[x]);
+					tn->internal[x] = passedTn;
 
-			T(YAFFS_TRACE_GC,
-			  (TSTR
-			   ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
-			   dev->nErasedBlocks, aggressive));
+				} else if (!tn->internal[x]) {
+					/* Don't have one, none passed in */
+					tn->internal[x] = yaffs_GetTnode(dev);
+					if(!tn->internal[x])
+						return NULL;
+				}
+			}
 
-			gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
+			tn = tn->internal[x];
+			l--;
 		}
-
-		if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
-			T(YAFFS_TRACE_GC,
-			  (TSTR
-			   ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
-			    TENDSTR), dev->nErasedBlocks, maxTries, block));
+	} else {
+		/* top is level 0 */
+		if (passedTn) {
+			memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+			yaffs_FreeTnode(dev, passedTn);
 		}
-	} while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
-		 (block > 0) &&
-		 (maxTries < 2));
+	}
 
-	return aggressive ? gcOk : YAFFS_OK;
+	return tn;
 }
 
-/*-------------------------  TAGS --------------------------------*/
-
-static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
-			   int chunkInObject)
+static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
+				yaffs_ExtendedTags *tags, int objectId,
+				int chunkInInode)
 {
-	return (tags->chunkId == chunkInObject &&
-		tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
+	int j;
 
+	for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
+		if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
+				theChunk % dev->param.nChunksPerBlock)) {
+			
+			if(dev->chunkGroupSize == 1)
+				return theChunk;
+			else {
+				yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
+								tags);
+				if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
+					/* found it; */
+					return theChunk;
+				}
+			}
+		}
+		theChunk++;
+	}
+	return -1;
 }
 
+#if 0
+/* Experimental code not being used yet. Might speed up file deletion */
+/* DeleteWorker scans backwards through the tnode tree and deletes all the
+ * chunks and tnodes in the file.
+ * Returns 1 if the tree was deleted.
+ * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
+ */
 
-/*-------------------- Data file manipulation -----------------*/
-
-static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
-				 yaffs_ExtendedTags *tags)
+static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
+			      int chunkOffset, int *limit)
 {
-	/*Get the Tnode, then get the level 0 offset chunk offset */
-	yaffs_Tnode *tn;
-	int theChunk = -1;
-	yaffs_ExtendedTags localTags;
-	int retVal = -1;
-
+	int i;
+	int chunkInInode;
+	int theChunk;
+	yaffs_ExtendedTags tags;
+	int foundChunk;
 	yaffs_Device *dev = in->myDev;
 
-	if (!tags) {
-		/* Passed a NULL, so use our own tags space */
-		tags = &localTags;
-	}
-
-	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+	int allDone = 1;
 
 	if (tn) {
-		theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+		if (level > 0) {
+			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+			     i--) {
+				if (tn->internal[i]) {
+					if (limit && (*limit) < 0) {
+						allDone = 0;
+					} else {
+						allDone =
+							yaffs_DeleteWorker(in,
+								tn->
+								internal
+								[i],
+								level -
+								1,
+								(chunkOffset
+									<<
+									YAFFS_TNODES_INTERNAL_BITS)
+								+ i,
+								limit);
+					}
+					if (allDone) {
+						yaffs_FreeTnode(dev,
+								tn->
+								internal[i]);
+						tn->internal[i] = NULL;
+					}
+				}
+			}
+			return (allDone) ? 1 : 0;
+		} else if (level == 0) {
+			int hitLimit = 0;
 
-		retVal =
-		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
-					   chunkInInode);
-	}
-	return retVal;
-}
+			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
+					i--) {
+				theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+				if (theChunk) {
 
-static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
-					  yaffs_ExtendedTags *tags)
-{
-	/* Get the Tnode, then get the level 0 offset chunk offset */
-	yaffs_Tnode *tn;
-	int theChunk = -1;
-	yaffs_ExtendedTags localTags;
+					chunkInInode = (chunkOffset <<
+						YAFFS_TNODES_LEVEL0_BITS) + i;
+
+					foundChunk =
+						yaffs_FindChunkInGroup(dev,
+								theChunk,
+								&tags,
+								in->objectId,
+								chunkInInode);
+
+					if (foundChunk > 0) {
+						yaffs_DeleteChunk(dev,
+								  foundChunk, 1,
+								  __LINE__);
+						in->nDataChunks--;
+						if (limit) {
+							*limit = *limit - 1;
+							if (*limit <= 0)
+								hitLimit = 1;
+						}
 
-	yaffs_Device *dev = in->myDev;
-	int retVal = -1;
+					}
+
+					yaffs_LoadLevel0Tnode(dev, tn, i, 0);
+				}
+
+			}
+			return (i < 0) ? 1 : 0;
+
+		}
 
-	if (!tags) {
-		/* Passed a NULL, so use our own tags space */
-		tags = &localTags;
 	}
 
-	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+	return 1;
 
-	if (tn) {
+}
 
-		theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+#endif
 
-		retVal =
-		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
-					   chunkInInode);
+static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
+{
+	yaffs_BlockInfo *theBlock;
+	unsigned blockNo;
 
-		/* Delete the entry in the filestructure (if found) */
-		if (retVal != -1)
-			yaffs_PutLevel0Tnode(dev, tn, chunkInInode, 0);
-	}
+	T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
 
-	return retVal;
+	blockNo =  chunk / dev->param.nChunksPerBlock;
+	theBlock = yaffs_GetBlockInfo(dev, blockNo);
+	if (theBlock) {
+		theBlock->softDeletions++;
+		dev->nFreeChunks++;
+		yaffs2_UpdateOldestDirtySequence(dev, blockNo, theBlock);
+	}
 }
 
-#ifdef YAFFS_PARANOID
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls the chunk out
+ * of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+ */
 
-static int yaffs_CheckFileSanity(yaffs_Object *in)
+static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
+				  __u32 level, int chunkOffset)
 {
-	int chunk;
-	int nChunks;
-	int fSize;
-	int failed = 0;
-	int objId;
-	yaffs_Tnode *tn;
-	yaffs_Tags localTags;
-	yaffs_Tags *tags = &localTags;
+	int i;
 	int theChunk;
-	int chunkDeleted;
+	int allDone = 1;
+	yaffs_Device *dev = in->myDev;
 
-	if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
-		return YAFFS_FAIL;
+	if (tn) {
+		if (level > 0) {
 
-	objId = in->objectId;
-	fSize = in->variant.fileVariant.fileSize;
-	nChunks =
-	    (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
-
-	for (chunk = 1; chunk <= nChunks; chunk++) {
-		tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
-					   chunk);
-
-		if (tn) {
-
-			theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
-
-			if (yaffs_CheckChunkBits
-			    (dev, theChunk / dev->nChunksPerBlock,
-			     theChunk % dev->nChunksPerBlock)) {
-
-				yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
-							    tags,
-							    &chunkDeleted);
-				if (yaffs_TagsMatch
-				    (tags, in->objectId, chunk, chunkDeleted)) {
-					/* found it; */
+			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+			     i--) {
+				if (tn->internal[i]) {
+					allDone =
+					    yaffs_SoftDeleteWorker(in,
+								   tn->
+								   internal[i],
+								   level - 1,
+								   (chunkOffset
+								    <<
+								    YAFFS_TNODES_INTERNAL_BITS)
+								   + i);
+					if (allDone) {
+						yaffs_FreeTnode(dev,
+								tn->
+								internal[i]);
+						tn->internal[i] = NULL;
+					} else {
+						/* Hoosterman... how could this happen? */
+					}
+				}
+			}
+			return (allDone) ? 1 : 0;
+		} else if (level == 0) {
 
+			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+				theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+				if (theChunk) {
+					/* Note this does not find the real chunk, only the chunk group.
+					 * We make an assumption that a chunk group is not larger than
+					 * a block.
+					 */
+					yaffs_SoftDeleteChunk(dev, theChunk);
+					yaffs_LoadLevel0Tnode(dev, tn, i, 0);
 				}
-			} else {
 
-				failed = 1;
 			}
+			return 1;
 
-		} else {
-			/* T(("No level 0 found for %d\n", chunk)); */
 		}
+
 	}
 
-	return failed ? YAFFS_FAIL : YAFFS_OK;
+	return 1;
+
 }
 
-#endif
+static void yaffs_SoftDeleteFile(yaffs_Object *obj)
+{
+	if (obj->deleted &&
+	    obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
+		if (obj->nDataChunks <= 0) {
+			/* Empty file with no duplicate object headers, just delete it immediately */
+			yaffs_FreeTnode(obj->myDev,
+					obj->variant.fileVariant.top);
+			obj->variant.fileVariant.top = NULL;
+			T(YAFFS_TRACE_TRACING,
+			  (TSTR("yaffs: Deleting empty file %d" TENDSTR),
+			   obj->objectId));
+			yaffs_DoGenericObjectDeletion(obj);
+		} else {
+			yaffs_SoftDeleteWorker(obj,
+					       obj->variant.fileVariant.top,
+					       obj->variant.fileVariant.
+					       topLevel, 0);
+			obj->softDeleted = 1;
+		}
+	}
+}
 
-static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
-				  int chunkInNAND, int inScan)
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
+				__u32 level, int del0)
 {
-	/* NB inScan is zero unless scanning.
-	 * For forward scanning, inScan is > 0;
-	 * for backward scanning inScan is < 0
-	 */
+	int i;
+	int hasData;
 
-	yaffs_Tnode *tn;
-	yaffs_Device *dev = in->myDev;
-	int existingChunk;
-	yaffs_ExtendedTags existingTags;
-	yaffs_ExtendedTags newTags;
-	unsigned existingSerial, newSerial;
+	if (tn) {
+		hasData = 0;
 
-	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
-		/* Just ignore an attempt at putting a chunk into a non-file during scanning
-		 * If it is not during Scanning then something went wrong!
-		 */
-		if (!inScan) {
-			T(YAFFS_TRACE_ERROR,
-			  (TSTR
-			   ("yaffs tragedy:attempt to put data chunk into a non-file"
-			    TENDSTR)));
-			YBUG();
-		}
+		if(level > 0){
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+				if (tn->internal[i]) {
+					tn->internal[i] =
+						yaffs_PruneWorker(dev, tn->internal[i],
+							level - 1,
+							(i == 0) ? del0 : 1);
+				}
 
-		yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-		return YAFFS_OK;
-	}
+				if (tn->internal[i])
+					hasData++;
+			}
+		} else {
+			int tnodeSize_u32 = dev->tnodeSize/sizeof(__u32);
+			__u32 *map = (__u32 *)tn;
 
-	tn = yaffs_AddOrFindLevel0Tnode(dev,
-					&in->variant.fileVariant,
-					chunkInInode,
-					NULL);
-	if (!tn)
-		return YAFFS_FAIL;
+                        for(i = 0; !hasData && i < tnodeSize_u32; i++){
+                                if(map[i])
+                                        hasData++;
+                        }
+                }
 
-	existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+		if (hasData == 0 && del0) {
+			/* Free and return NULL */
 
-	if (inScan != 0) {
-		/* If we're scanning then we need to test for duplicates
-		 * NB This does not need to be efficient since it should only ever
-		 * happen when the power fails during a write, then only one
-		 * chunk should ever be affected.
-		 *
-		 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
-		 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
-		 */
+			yaffs_FreeTnode(dev, tn);
+			tn = NULL;
+		}
 
-		if (existingChunk > 0) {
-			/* NB Right now existing chunk will not be real chunkId if the device >= 32MB
-			 *    thus we have to do a FindChunkInFile to get the real chunk id.
-			 *
-			 * We have a duplicate now we need to decide which one to use:
-			 *
-			 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
-			 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
-			 * YAFFS1: Get both sets of tags and compare serial numbers.
-			 */
+	}
 
-			if (inScan > 0) {
-				/* Only do this for forward scanning */
-				yaffs_ReadChunkWithTagsFromNAND(dev,
-								chunkInNAND,
-								NULL, &newTags);
+	return tn;
 
-				/* Do a proper find */
-				existingChunk =
-				    yaffs_FindChunkInFile(in, chunkInInode,
-							  &existingTags);
-			}
+}
 
-			if (existingChunk <= 0) {
-				/*Hoosterman - how did this happen? */
+static int yaffs_PruneFileStructure(yaffs_Device *dev,
+				yaffs_FileStructure *fStruct)
+{
+	int i;
+	int hasData;
+	int done = 0;
+	yaffs_Tnode *tn;
 
-				T(YAFFS_TRACE_ERROR,
-				  (TSTR
-				   ("yaffs tragedy: existing chunk < 0 in scan"
-				    TENDSTR)));
+	if (fStruct->topLevel > 0) {
+		fStruct->top =
+		    yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
 
-			}
+		/* Now we have a tree with all the non-zero branches NULL but the height
+		 * is the same as it was.
+		 * Let's see if we can trim internal tnodes to shorten the tree.
+		 * We can do this if only the 0th element in the tnode is in use
+		 * (ie all the non-zero are NULL)
+		 */
 
-			/* NB The deleted flags should be false, otherwise the chunks will
-			 * not be loaded during a scan
-			 */
+		while (fStruct->topLevel && !done) {
+			tn = fStruct->top;
 
-			if (inScan > 0) {
-				newSerial = newTags.serialNumber;
-				existingSerial = existingTags.serialNumber;
+			hasData = 0;
+			for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+				if (tn->internal[i])
+					hasData++;
 			}
-
-			if ((inScan > 0) &&
-			    (in->myDev->isYaffs2 ||
-			     existingChunk <= 0 ||
-			     ((existingSerial + 1) & 3) == newSerial)) {
-				/* Forward scanning.
-				 * Use new
-				 * Delete the old one and drop through to update the tnode
-				 */
-				yaffs_DeleteChunk(dev, existingChunk, 1,
-						  __LINE__);
-			} else {
-				/* Backward scanning or we want to use the existing one
-				 * Use existing.
-				 * Delete the new one and return early so that the tnode isn't changed
-				 */
-				yaffs_DeleteChunk(dev, chunkInNAND, 1,
-						  __LINE__);
-				return YAFFS_OK;
+
+			if (!hasData) {
+				fStruct->top = tn->internal[0];
+				fStruct->topLevel--;
+				yaffs_FreeTnode(dev, tn);
+			} else {
+				done = 1;
 			}
 		}
-
 	}
 
-	if (existingChunk == 0)
-		in->nDataChunks++;
-
-	yaffs_PutLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
-
 	return YAFFS_OK;
 }
 
-static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
-					__u8 *buffer)
-{
-	int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
-
-	if (chunkInNAND >= 0)
-		return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
-						buffer, NULL);
-	else {
-		T(YAFFS_TRACE_NANDACCESS,
-		  (TSTR("Chunk %d not found zero instead" TENDSTR),
-		   chunkInNAND));
-		/* get sane (zero) data if you read a hole */
-		memset(buffer, 0, in->myDev->nDataBytesPerChunk);
-		return 0;
-	}
+/*-------------------- End of File Structure functions.-------------------*/
 
-}
 
-void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
+/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
+static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
 {
-	int block;
-	int page;
-	yaffs_ExtendedTags tags;
-	yaffs_BlockInfo *bi;
+	yaffs_Object *obj = yaffs_AllocateRawObject(dev);
 
-	if (chunkId <= 0)
-		return;
+	if (obj) {
+		dev->nObjects++;
 
-	dev->nDeletions++;
-	block = chunkId / dev->nChunksPerBlock;
-	page = chunkId % dev->nChunksPerBlock;
+		/* Now sweeten it up... */
 
+		memset(obj, 0, sizeof(yaffs_Object));
+		obj->beingCreated = 1;
 
-	if (!yaffs_CheckChunkBit(dev, block, page))
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Deleting invalid chunk %d"TENDSTR),
-			 chunkId));
+		obj->myDev = dev;
+		obj->hdrChunk = 0;
+		obj->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+		YINIT_LIST_HEAD(&(obj->hardLinks));
+		YINIT_LIST_HEAD(&(obj->hashLink));
+		YINIT_LIST_HEAD(&obj->siblings);
 
-	bi = yaffs_GetBlockInfo(dev, block);
 
-	T(YAFFS_TRACE_DELETION,
-	  (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
+		/* Now make the directory sane */
+		if (dev->rootDir) {
+			obj->parent = dev->rootDir;
+			ylist_add(&(obj->siblings), &dev->rootDir->variant.directoryVariant.children);
+		}
 
-	if (markNAND &&
-	    bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
+		/* Add it to the lost and found directory.
+		 * NB Can't put root or lostNFound in lostNFound so
+		 * check if lostNFound exists first
+		 */
+		if (dev->lostNFoundDir)
+			yaffs_AddObjectToDirectory(dev->lostNFoundDir, obj);
 
-		yaffs_InitialiseTags(&tags);
+		obj->beingCreated = 0;
+	}
 
-		tags.chunkDeleted = 1;
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 
-		yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
-		yaffs_HandleUpdateChunk(dev, chunkId, &tags);
-	} else {
-		dev->nUnmarkedDeletions++;
-	}
+	return obj;
+}
 
-	/* Pull out of the management area.
-	 * If the whole block became dirty, this will kick off an erasure.
-	 */
-	if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
-	    bi->blockState == YAFFS_BLOCK_STATE_FULL ||
-	    bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-	    bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
-		dev->nFreeChunks++;
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
+					       __u32 mode)
+{
 
-		yaffs_ClearChunkBit(dev, block, page);
+	yaffs_Object *obj =
+	    yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+	if (obj) {
+		obj->fake = 1;		/* it is fake so it might have no NAND presence... */
+		obj->renameAllowed = 0;	/* ... and we're not allowed to rename it... */
+		obj->unlinkAllowed = 0;	/* ... or unlink it */
+		obj->deleted = 0;
+		obj->unlinked = 0;
+		obj->yst_mode = mode;
+		obj->myDev = dev;
+		obj->hdrChunk = 0;	/* Not a valid chunk. */
+	}
 
-		bi->pagesInUse--;
+	return obj;
 
-		if (bi->pagesInUse == 0 &&
-		    !bi->hasShrinkHeader &&
-		    bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
-		    bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-			yaffs_BlockBecameDirty(dev, block);
-		}
+}
 
-	}
+static void yaffs_UnhashObject(yaffs_Object *obj)
+{
+	int bucket;
+	yaffs_Device *dev = obj->myDev;
 
+	/* If it is still linked into the bucket list, free from the list */
+	if (!ylist_empty(&obj->hashLink)) {
+		ylist_del_init(&obj->hashLink);
+		bucket = yaffs_HashFunction(obj->objectId);
+		dev->objectBucket[bucket].count--;
+	}
 }
 
-static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
-					const __u8 *buffer, int nBytes,
-					int useReserve)
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_FreeObject(yaffs_Object *obj)
 {
-	/* Find old chunk Need to do this to get serial number
-	 * Write new one and patch into tree.
-	 * Invalidate old tags.
-	 */
+	yaffs_Device *dev = obj->myDev;
 
-	int prevChunkId;
-	yaffs_ExtendedTags prevTags;
+	T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->myInode));
 
-	int newChunkId;
-	yaffs_ExtendedTags newTags;
+	if (!obj)
+		YBUG();
+	if (obj->parent)
+		YBUG();
+	if (!ylist_empty(&obj->siblings))
+		YBUG();
 
-	yaffs_Device *dev = in->myDev;
 
-	yaffs_CheckGarbageCollection(dev);
+	if (obj->myInode) {
+		/* We're still hooked up to a cached inode.
+		 * Don't delete now, but mark for later deletion
+		 */
+		obj->deferedFree = 1;
+		return;
+	}
+
+	yaffs_UnhashObject(obj);
 
-	/* Get the previous chunk at this location in the file if it exists */
-	prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
+	yaffs_FreeRawObject(dev,obj);
+	dev->nObjects--;
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+}
 
-	/* Set up new tags */
-	yaffs_InitialiseTags(&newTags);
 
-	newTags.chunkId = chunkInInode;
-	newTags.objectId = in->objectId;
-	newTags.serialNumber =
-	    (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
-	newTags.byteCount = nBytes;
+void yaffs_HandleDeferedFree(yaffs_Object *obj)
+{
+	if (obj->deferedFree)
+		yaffs_FreeObject(obj);
+}
 
-	if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
-		T(YAFFS_TRACE_ERROR,
-		(TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
-		YBUG();
+static void yaffs_InitialiseTnodesAndObjects(yaffs_Device *dev)
+{
+	int i;
+
+	dev->nObjects = 0;
+	dev->nTnodes = 0;
+
+	yaffs_InitialiseRawTnodesAndObjects(dev);
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		YINIT_LIST_HEAD(&dev->objectBucket[i].list);
+		dev->objectBucket[i].count = 0;
 	}
+}
 
-	newChunkId =
-	    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-					      useReserve);
+static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
+{
+	int i;
+	int l = 999;
+	int lowest = 999999;
 
-	if (newChunkId >= 0) {
-		yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
 
-		if (prevChunkId >= 0)
-			yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
+	/* Search for the shortest list or one that
+	 * isn't too long.
+	 */
+
+	for (i = 0; i < 10 && lowest > 4; i++) {
+		dev->bucketFinder++;
+		dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->objectBucket[dev->bucketFinder].count < lowest) {
+			lowest = dev->objectBucket[dev->bucketFinder].count;
+			l = dev->bucketFinder;
+		}
 
-		yaffs_CheckFileSanity(in);
 	}
-	return newChunkId;
 
+	return l;
 }
 
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
-			     int isShrink, int shadows)
+static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
 {
+	int bucket = yaffs_FindNiceObjectBucket(dev);
 
-	yaffs_BlockInfo *bi;
+	/* Now find an object value that has not already been taken
+	 * by scanning the list.
+	 */
 
-	yaffs_Device *dev = in->myDev;
+	int found = 0;
+	struct ylist_head *i;
 
-	int prevChunkId;
-	int retVal = 0;
-	int result = 0;
+	__u32 n = (__u32) bucket;
 
-	int newChunkId;
-	yaffs_ExtendedTags newTags;
-	yaffs_ExtendedTags oldTags;
+	/* yaffs_CheckObjectHashSanity();  */
 
-	__u8 *buffer = NULL;
-	YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
+	while (!found) {
+		found = 1;
+		n += YAFFS_NOBJECT_BUCKETS;
+		if (1 || dev->objectBucket[bucket].count > 0) {
+			ylist_for_each(i, &dev->objectBucket[bucket].list) {
+				/* If there is already one in the list */
+				if (i && ylist_entry(i, yaffs_Object,
+						hashLink)->objectId == n) {
+					found = 0;
+				}
+			}
+		}
+	}
 
-	yaffs_ObjectHeader *oh = NULL;
+	return n;
+}
 
-	yaffs_strcpy(oldName, _Y("silly old name"));
+static void yaffs_HashObject(yaffs_Object *in)
+{
+	int bucket = yaffs_HashFunction(in->objectId);
+	yaffs_Device *dev = in->myDev;
 
+	ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
+	dev->objectBucket[bucket].count++;
+}
 
-	if (!in->fake ||
-		in == dev->rootDir || /* The rootDir should also be saved */
-		force) {
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
+{
+	int bucket = yaffs_HashFunction(number);
+	struct ylist_head *i;
+	yaffs_Object *in;
 
-		yaffs_CheckGarbageCollection(dev);
-		yaffs_CheckObjectDetailsLoaded(in);
+	ylist_for_each(i, &dev->objectBucket[bucket].list) {
+		/* Look if it is in the list */
+		if (i) {
+			in = ylist_entry(i, yaffs_Object, hashLink);
+			if (in->objectId == number) {
 
-		buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
-		oh = (yaffs_ObjectHeader *) buffer;
+				/* Don't tell the VFS about this one if it is defered free */
+				if (in->deferedFree)
+					return NULL;
 
-		prevChunkId = in->hdrChunk;
+				return in;
+			}
+		}
+	}
 
-		if (prevChunkId > 0) {
-			result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
-							buffer, &oldTags);
+	return NULL;
+}
 
-			yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
+				    yaffs_ObjectType type)
+{
+	yaffs_Object *theObject=NULL;
+	yaffs_Tnode *tn = NULL;
+
+	if (number < 0)
+		number = yaffs_CreateNewObjectNumber(dev);
 
-			memcpy(oldName, oh->name, sizeof(oh->name));
-		}
+	if (type == YAFFS_OBJECT_TYPE_FILE) {
+		tn = yaffs_GetTnode(dev);
+		if (!tn)
+			return NULL;
+	}
 
-		memset(buffer, 0xFF, dev->nDataBytesPerChunk);
+	theObject = yaffs_AllocateEmptyObject(dev);
+	if (!theObject){
+		if(tn)
+			yaffs_FreeTnode(dev,tn);
+		return NULL;
+	}
 
-		oh->type = in->variantType;
-		oh->yst_mode = in->yst_mode;
-		oh->shadowsObject = oh->inbandShadowsObject = shadows;
 
+	if (theObject) {
+		theObject->fake = 0;
+		theObject->renameAllowed = 1;
+		theObject->unlinkAllowed = 1;
+		theObject->objectId = number;
+		yaffs_HashObject(theObject);
+		theObject->variantType = type;
 #ifdef CONFIG_YAFFS_WINCE
-		oh->win_atime[0] = in->win_atime[0];
-		oh->win_ctime[0] = in->win_ctime[0];
-		oh->win_mtime[0] = in->win_mtime[0];
-		oh->win_atime[1] = in->win_atime[1];
-		oh->win_ctime[1] = in->win_ctime[1];
-		oh->win_mtime[1] = in->win_mtime[1];
-#else
-		oh->yst_uid = in->yst_uid;
-		oh->yst_gid = in->yst_gid;
-		oh->yst_atime = in->yst_atime;
-		oh->yst_mtime = in->yst_mtime;
-		oh->yst_ctime = in->yst_ctime;
-		oh->yst_rdev = in->yst_rdev;
-#endif
-		if (in->parent)
-			oh->parentObjectId = in->parent->objectId;
-		else
-			oh->parentObjectId = 0;
-
-		if (name && *name) {
-			memset(oh->name, 0, sizeof(oh->name));
-			yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
-		} else if (prevChunkId >= 0)
-			memcpy(oh->name, oldName, sizeof(oh->name));
-		else
-			memset(oh->name, 0, sizeof(oh->name));
+		yfsd_WinFileTimeNow(theObject->win_atime);
+		theObject->win_ctime[0] = theObject->win_mtime[0] =
+		    theObject->win_atime[0];
+		theObject->win_ctime[1] = theObject->win_mtime[1] =
+		    theObject->win_atime[1];
 
-		oh->isShrink = isShrink;
+#else
 
-		switch (in->variantType) {
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-			/* Should not happen */
-			break;
+		theObject->yst_atime = theObject->yst_mtime =
+		    theObject->yst_ctime = Y_CURRENT_TIME;
+#endif
+		switch (type) {
 		case YAFFS_OBJECT_TYPE_FILE:
-			oh->fileSize =
-			    (oh->parentObjectId == YAFFS_OBJECTID_DELETED
-			     || oh->parentObjectId ==
-			     YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
-			    fileVariant.fileSize;
-			break;
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-			oh->equivalentObjectId =
-			    in->variant.hardLinkVariant.equivalentObjectId;
-			break;
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-			/* Do nothing */
+			theObject->variant.fileVariant.fileSize = 0;
+			theObject->variant.fileVariant.scannedFileSize = 0;
+			theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF;	/* max __u32 */
+			theObject->variant.fileVariant.topLevel = 0;
+			theObject->variant.fileVariant.top = tn;
 			break;
 		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			/* Do nothing */
+			YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
+					children);
+			YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
+					dirty);
 			break;
 		case YAFFS_OBJECT_TYPE_SYMLINK:
-			yaffs_strncpy(oh->alias,
-				      in->variant.symLinkVariant.alias,
-				      YAFFS_MAX_ALIAS_LENGTH);
-			oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			/* No action required */
+			break;
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* todo this should not happen */
 			break;
 		}
+	}
 
-		/* Tags */
-		yaffs_InitialiseTags(&newTags);
-		in->serial++;
-		newTags.chunkId = 0;
-		newTags.objectId = in->objectId;
-		newTags.serialNumber = in->serial;
-
-		/* Add extra info for file header */
-
-		newTags.extraHeaderInfoAvailable = 1;
-		newTags.extraParentObjectId = oh->parentObjectId;
-		newTags.extraFileLength = oh->fileSize;
-		newTags.extraIsShrinkHeader = oh->isShrink;
-		newTags.extraEquivalentObjectId = oh->equivalentObjectId;
-		newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
-		newTags.extraObjectType = in->variantType;
-
-		yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
+	return theObject;
+}
 
-		/* Create new chunk in NAND */
-		newChunkId =
-		    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-						      (prevChunkId >= 0) ? 1 : 0);
+yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
+						int number,
+						yaffs_ObjectType type)
+{
+	yaffs_Object *theObject = NULL;
 
-		if (newChunkId >= 0) {
+	if (number > 0)
+		theObject = yaffs_FindObjectByNumber(dev, number);
 
-			in->hdrChunk = newChunkId;
+	if (!theObject)
+		theObject = yaffs_CreateNewObject(dev, number, type);
 
-			if (prevChunkId >= 0) {
-				yaffs_DeleteChunk(dev, prevChunkId, 1,
-						  __LINE__);
-			}
+	return theObject;
 
-			if (!yaffs_ObjectHasCachedWriteData(in))
-				in->dirty = 0;
+}
 
-			/* If this was a shrink, then mark the block that the chunk lives on */
-			if (isShrink) {
-				bi = yaffs_GetBlockInfo(in->myDev,
-					newChunkId / in->myDev->nChunksPerBlock);
-				bi->hasShrinkHeader = 1;
-			}
 
-		}
+YCHAR *yaffs_CloneString(const YCHAR *str)
+{
+	YCHAR *newStr = NULL;
+	int len;
 
-		retVal = newChunkId;
+	if (!str)
+		str = _Y("");
 
+	len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
+	newStr = YMALLOC((len + 1) * sizeof(YCHAR));
+	if (newStr){
+		yaffs_strncpy(newStr, str,len);
+		newStr[len] = 0;
 	}
+	return newStr;
 
-	if (buffer)
-		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
-	return retVal;
 }
 
-/*------------------------ Short Operations Cache ----------------------------------------
- *   In many situations where there is no high level buffering (eg WinCE) a lot of
- *   reads might be short sequential reads, and a lot of writes may be short
- *   sequential writes. eg. scanning/writing a jpeg file.
- *   In these cases, a short read/write cache can provide a huge perfomance benefit
- *   with dumb-as-a-rock code.
- *   In Linux, the page cache provides read buffering aand the short op cache provides write
- *   buffering.
- *
- *   There are a limited number (~10) of cache chunks per device so that we don't
- *   need a very intelligent search.
+/*
+ * Mknod (create) a new object.
+ * equivalentObject only has meaning for a hard link;
+ * aliasString only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
  */
 
-static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
+static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
+				       yaffs_Object *parent,
+				       const YCHAR *name,
+				       __u32 mode,
+				       __u32 uid,
+				       __u32 gid,
+				       yaffs_Object *equivalentObject,
+				       const YCHAR *aliasString, __u32 rdev)
 {
-	yaffs_Device *dev = obj->myDev;
-	int i;
-	yaffs_ChunkCache *cache;
-	int nCaches = obj->myDev->nShortOpCaches;
+	yaffs_Object *in;
+	YCHAR *str = NULL;
 
-	for (i = 0; i < nCaches; i++) {
-		cache = &dev->srCache[i];
-		if (cache->object == obj &&
-		    cache->dirty)
-			return 1;
+	yaffs_Device *dev = parent->myDev;
+
+	/* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
+	if (yaffs_FindObjectByName(parent, name))
+		return NULL;
+
+	if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		str = yaffs_CloneString(aliasString);
+		if (!str)
+			return NULL;
 	}
 
-	return 0;
-}
+	in = yaffs_CreateNewObject(dev, -1, type);
 
+	if (!in){
+		if(str)
+			YFREE(str);
+		return NULL;
+	}
 
-static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
-{
-	yaffs_Device *dev = obj->myDev;
-	int lowest = -99;	/* Stop compiler whining. */
-	int i;
-	yaffs_ChunkCache *cache;
-	int chunkWritten = 0;
-	int nCaches = obj->myDev->nShortOpCaches;
 
-	if (nCaches > 0) {
-		do {
-			cache = NULL;
 
-			/* Find the dirty cache for this object with the lowest chunk id. */
-			for (i = 0; i < nCaches; i++) {
-				if (dev->srCache[i].object == obj &&
-				    dev->srCache[i].dirty) {
-					if (!cache
-					    || dev->srCache[i].chunkId <
-					    lowest) {
-						cache = &dev->srCache[i];
-						lowest = cache->chunkId;
-					}
-				}
-			}
 
-			if (cache && !cache->locked) {
-				/* Write it out and free it up */
 
-				chunkWritten =
-				    yaffs_WriteChunkDataToObject(cache->object,
-								 cache->chunkId,
-								 cache->data,
-								 cache->nBytes,
-								 1);
-				cache->dirty = 0;
-				cache->object = NULL;
-			}
+	if (in) {
+		in->hdrChunk = 0;
+		in->valid = 1;
+		in->variantType = type;
 
-		} while (cache && chunkWritten > 0);
+		in->yst_mode = mode;
 
-		if (cache) {
-			/* Hoosterman, disk full while writing cache out. */
-			T(YAFFS_TRACE_ERROR,
-			  (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_WinFileTimeNow(in->win_atime);
+		in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
+		in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
+
+#else
+		in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
+
+		in->yst_rdev = rdev;
+		in->yst_uid = uid;
+		in->yst_gid = gid;
+#endif
+		in->nDataChunks = 0;
+
+		yaffs_SetObjectName(in, name);
+		in->dirty = 1;
+
+		yaffs_AddObjectToDirectory(parent, in);
+
+		in->myDev = parent->myDev;
+
+		switch (type) {
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			in->variant.symLinkVariant.alias = str;
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+			in->variant.hardLinkVariant.equivalentObject =
+				equivalentObject;
+			in->variant.hardLinkVariant.equivalentObjectId =
+				equivalentObject->objectId;
+			ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
+			break;
+		case YAFFS_OBJECT_TYPE_FILE:
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* do nothing */
+			break;
+		}
 
+		if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0, NULL) < 0) {
+			/* Could not create the object header, fail the creation */
+			yaffs_DeleteObject(in);
+			in = NULL;
 		}
+
+		yaffs_UpdateParent(parent);
 	}
 
+	return in;
 }
 
-/*yaffs_FlushEntireDeviceCache(dev)
- *
- *
- */
-
-void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
+yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
+			__u32 mode, __u32 uid, __u32 gid)
 {
-	yaffs_Object *obj;
-	int nCaches = dev->nShortOpCaches;
-	int i;
-
-	/* Find a dirty object in the cache and flush it...
-	 * until there are no further dirty objects.
-	 */
-	do {
-		obj = NULL;
-		for (i = 0; i < nCaches && !obj; i++) {
-			if (dev->srCache[i].object &&
-			    dev->srCache[i].dirty)
-				obj = dev->srCache[i].object;
-
-		}
-		if (obj)
-			yaffs_FlushFilesChunkCache(obj);
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+				uid, gid, NULL, NULL, 0);
+}
 
-	} while (obj);
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
+				__u32 mode, __u32 uid, __u32 gid)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+				 mode, uid, gid, NULL, NULL, 0);
+}
 
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
+				__u32 mode, __u32 uid, __u32 gid, __u32 rdev)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+				 uid, gid, NULL, NULL, rdev);
 }
 
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
+				__u32 mode, __u32 uid, __u32 gid,
+				const YCHAR *alias)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+				uid, gid, NULL, alias, 0);
+}
 
-/* Grab us a cache chunk for use.
- * First look for an empty one.
- * Then look for the least recently used non-dirty one.
- * Then look for the least recently used dirty one...., flush and look again.
- */
-static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
+/* yaffs_Link returns the object id of the equivalent object.*/
+yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
+			yaffs_Object *equivalentObject)
 {
-	int i;
+	/* Get the real object in case we were fed a hard link as an equivalent object */
+	equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
 
-	if (dev->nShortOpCaches > 0) {
-		for (i = 0; i < dev->nShortOpCaches; i++) {
-			if (!dev->srCache[i].object)
-				return &dev->srCache[i];
-		}
+	if (yaffs_MknodObject
+	    (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+	     equivalentObject, NULL, 0)) {
+		return equivalentObject;
+	} else {
+		return NULL;
 	}
 
-	return NULL;
 }
 
-static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
+static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
+				const YCHAR *newName, int force, int shadows)
 {
-	yaffs_ChunkCache *cache;
-	yaffs_Object *theObj;
-	int usage;
-	int i;
-	int pushout;
-
-	if (dev->nShortOpCaches > 0) {
-		/* Try find a non-dirty one... */
+	int unlinkOp;
+	int deleteOp;
 
-		cache = yaffs_GrabChunkCacheWorker(dev);
+	yaffs_Object *existingTarget;
 
-		if (!cache) {
-			/* They were all dirty, find the last recently used object and flush
-			 * its cache, then  find again.
-			 * NB what's here is not very accurate, we actually flush the object
-			 * the last recently used page.
-			 */
+	if (newDir == NULL)
+		newDir = obj->parent;	/* use the old directory */
 
-			/* With locking we can't assume we can use entry zero */
+	if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
+		    TENDSTR)));
+		YBUG();
+	}
 
-			theObj = NULL;
-			usage = -1;
-			cache = NULL;
-			pushout = -1;
+	/* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+	if (obj->myDev->param.isYaffs2)
+		unlinkOp = (newDir == obj->myDev->unlinkedDir);
+	else
+		unlinkOp = (newDir == obj->myDev->unlinkedDir
+			    && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
 
-			for (i = 0; i < dev->nShortOpCaches; i++) {
-				if (dev->srCache[i].object &&
-				    !dev->srCache[i].locked &&
-				    (dev->srCache[i].lastUse < usage || !cache)) {
-					usage = dev->srCache[i].lastUse;
-					theObj = dev->srCache[i].object;
-					cache = &dev->srCache[i];
-					pushout = i;
-				}
-			}
+	deleteOp = (newDir == obj->myDev->deletedDir);
 
-			if (!cache || cache->dirty) {
-				/* Flush and try again */
-				yaffs_FlushFilesChunkCache(theObj);
-				cache = yaffs_GrabChunkCacheWorker(dev);
-			}
+	existingTarget = yaffs_FindObjectByName(newDir, newName);
 
-		}
-		return cache;
-	} else
-		return NULL;
+	/* If the object is a file going into the unlinked directory,
+	 *   then it is OK to just stuff it in since duplicate names are allowed.
+	 *   else only proceed if the new name does not exist and if we're putting
+	 *   it into a directory.
+	 */
+	if ((unlinkOp ||
+	     deleteOp ||
+	     force ||
+	     (shadows > 0) ||
+	     !existingTarget) &&
+	    newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_SetObjectName(obj, newName);
+		obj->dirty = 1;
 
-}
+		yaffs_AddObjectToDirectory(newDir, obj);
 
-/* Find a cached chunk */
-static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
-					      int chunkId)
-{
-	yaffs_Device *dev = obj->myDev;
-	int i;
-	if (dev->nShortOpCaches > 0) {
-		for (i = 0; i < dev->nShortOpCaches; i++) {
-			if (dev->srCache[i].object == obj &&
-			    dev->srCache[i].chunkId == chunkId) {
-				dev->cacheHits++;
+		if (unlinkOp)
+			obj->unlinked = 1;
 
-				return &dev->srCache[i];
-			}
-		}
+		/* If it is a deletion then we mark it as a shrink for gc purposes. */
+		if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows, NULL) >= 0)
+			return YAFFS_OK;
 	}
-	return NULL;
+
+	return YAFFS_FAIL;
 }
 
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
-				int isAWrite)
+int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
+		yaffs_Object *newDir, const YCHAR *newName)
 {
+	yaffs_Object *obj = NULL;
+	yaffs_Object *existingTarget = NULL;
+	int force = 0;
+	int result;
+	yaffs_Device *dev;
 
-	if (dev->nShortOpCaches > 0) {
-		if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
-			/* Reset the cache usages */
-			int i;
-			for (i = 1; i < dev->nShortOpCaches; i++)
-				dev->srCache[i].lastUse = 0;
 
-			dev->srLastUse = 0;
-		}
+	if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+		YBUG();
+	if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+		YBUG();
 
-		dev->srLastUse++;
+	dev = oldDir->myDev;
 
-		cache->lastUse = dev->srLastUse;
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+	/* Special case for case insemsitive systems (eg. WinCE).
+	 * While look-up is case insensitive, the name isn't.
+	 * Therefore we might want to change x.txt to X.txt
+	*/
+	if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
+		force = 1;
+#endif
 
-		if (isAWrite)
-			cache->dirty = 1;
-	}
-}
+	if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
+		/* ENAMETOOLONG */
+		return YAFFS_FAIL;
 
-/* Invalidate a single cache page.
- * Do this when a whole page gets written,
- * ie the short cache for this page is no longer valid.
- */
-static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
-{
-	if (object->myDev->nShortOpCaches > 0) {
-		yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
+	obj = yaffs_FindObjectByName(oldDir, oldName);
 
-		if (cache)
-			cache->object = NULL;
-	}
-}
+	if (obj && obj->renameAllowed) {
 
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
- */
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
-{
-	int i;
-	yaffs_Device *dev = in->myDev;
+		/* Now do the handling for an existing target, if there is one */
 
-	if (dev->nShortOpCaches > 0) {
-		/* Invalidate it. */
-		for (i = 0; i < dev->nShortOpCaches; i++) {
-			if (dev->srCache[i].object == in)
-				dev->srCache[i].object = NULL;
+		existingTarget = yaffs_FindObjectByName(newDir, newName);
+		if (existingTarget &&
+			existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+			!ylist_empty(&existingTarget->variant.directoryVariant.children)) {
+			/* There is a target that is a non-empty directory, so we fail */
+			return YAFFS_FAIL;	/* EEXIST or ENOTEMPTY */
+		} else if (existingTarget && existingTarget != obj) {
+			/* Nuke the target first, using shadowing,
+			 * but only if it isn't the same object.
+			 *
+			 * Note we must disable gc otherwise it can mess up the shadowing.
+			 *
+			 */
+			dev->gcDisable=1;
+			yaffs_ChangeObjectName(obj, newDir, newName, force,
+						existingTarget->objectId);
+			existingTarget->isShadowed = 1;
+			yaffs_UnlinkObject(existingTarget);
+			dev->gcDisable=0;
 		}
+
+		result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
+
+		yaffs_UpdateParent(oldDir);
+		if(newDir != oldDir)
+			yaffs_UpdateParent(newDir);
+		
+		return result;
 	}
+	return YAFFS_FAIL;
 }
 
-/*--------------------- Checkpointing --------------------*/
-
+/*------------------------- Block Management and Page Allocation ----------------*/
 
-static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
+static int yaffs_InitialiseBlocks(yaffs_Device *dev)
 {
-	yaffs_CheckpointValidity cp;
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
 
-	memset(&cp, 0, sizeof(cp));
+	dev->blockInfo = NULL;
+	dev->chunkBits = NULL;
 
-	cp.structType = sizeof(cp);
-	cp.magic = YAFFS_MAGIC;
-	cp.version = YAFFS_CHECKPOINT_VERSION;
-	cp.head = (head) ? 1 : 0;
+	dev->allocationBlock = -1;	/* force it to get a new one */
 
-	return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
-		1 : 0;
-}
+	/* If the first allocation strategy fails, thry the alternate one */
+	dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+	if (!dev->blockInfo) {
+		dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
+		dev->blockInfoAlt = 1;
+	} else
+		dev->blockInfoAlt = 0;
 
-static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
-{
-	yaffs_CheckpointValidity cp;
-	int ok;
+	if (dev->blockInfo) {
+		/* Set up dynamic blockinfo stuff. */
+		dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
+		dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
+		if (!dev->chunkBits) {
+			dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
+			dev->chunkBitsAlt = 1;
+		} else
+			dev->chunkBitsAlt = 0;
+	}
 
-	ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+	if (dev->blockInfo && dev->chunkBits) {
+		memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
+		memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
+		return YAFFS_OK;
+	}
 
-	if (ok)
-		ok = (cp.structType == sizeof(cp)) &&
-		     (cp.magic == YAFFS_MAGIC) &&
-		     (cp.version == YAFFS_CHECKPOINT_VERSION) &&
-		     (cp.head == ((head) ? 1 : 0));
-	return ok ? 1 : 0;
+	return YAFFS_FAIL;
 }
 
-static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
-					   yaffs_Device *dev)
+static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
 {
-	cp->nErasedBlocks = dev->nErasedBlocks;
-	cp->allocationBlock = dev->allocationBlock;
-	cp->allocationPage = dev->allocationPage;
-	cp->nFreeChunks = dev->nFreeChunks;
+	if (dev->blockInfoAlt && dev->blockInfo)
+		YFREE_ALT(dev->blockInfo);
+	else if (dev->blockInfo)
+		YFREE(dev->blockInfo);
+
+	dev->blockInfoAlt = 0;
 
-	cp->nDeletedFiles = dev->nDeletedFiles;
-	cp->nUnlinkedFiles = dev->nUnlinkedFiles;
-	cp->nBackgroundDeletions = dev->nBackgroundDeletions;
-	cp->sequenceNumber = dev->sequenceNumber;
-	cp->oldestDirtySequence = dev->oldestDirtySequence;
+	dev->blockInfo = NULL;
 
+	if (dev->chunkBitsAlt && dev->chunkBits)
+		YFREE_ALT(dev->chunkBits);
+	else if (dev->chunkBits)
+		YFREE(dev->chunkBits);
+	dev->chunkBitsAlt = 0;
+	dev->chunkBits = NULL;
 }
 
-static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
-					   yaffs_CheckpointDevice *cp)
+void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
 {
-	dev->nErasedBlocks = cp->nErasedBlocks;
-	dev->allocationBlock = cp->allocationBlock;
-	dev->allocationPage = cp->allocationPage;
-	dev->nFreeChunks = cp->nFreeChunks;
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
 
-	dev->nDeletedFiles = cp->nDeletedFiles;
-	dev->nUnlinkedFiles = cp->nUnlinkedFiles;
-	dev->nBackgroundDeletions = cp->nBackgroundDeletions;
-	dev->sequenceNumber = cp->sequenceNumber;
-	dev->oldestDirtySequence = cp->oldestDirtySequence;
-}
+	int erasedOk = 0;
 
+	/* If the block is still healthy erase it and mark as clean.
+	 * If the block has had a data failure, then retire it.
+	 */
 
-static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
-{
-	yaffs_CheckpointDevice cp;
-	__u32 nBytes;
-	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+	T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+		(TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
+		blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
 
-	int ok;
+	yaffs2_ClearOldestDirtySequence(dev,bi);
 
-	/* Write device runtime values*/
-	yaffs_DeviceToCheckpointDevice(&cp, dev);
-	cp.structType = sizeof(cp);
+	bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
 
-	ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+	/* If this is the block being garbage collected then stop gc'ing this block */
+	if(blockNo == dev->gcBlock)
+		dev->gcBlock = 0;
+
+	/* If this block is currently the best candidate for gc then drop as a candidate */
+	if(blockNo == dev->gcDirtiest){
+		dev->gcDirtiest = 0;
+		dev->gcPagesInUse = 0;
+	}
 
-	/* Write block info */
-	if (ok) {
-		nBytes = nBlocks * sizeof(yaffs_BlockInfo);
-		ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
+	if (!bi->needsRetiring) {
+		yaffs2_InvalidateCheckpoint(dev);
+		erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
+		if (!erasedOk) {
+			dev->nErasureFailures++;
+			T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
+		}
 	}
 
-	/* Write chunk bits */
-	if (ok) {
-		nBytes = nBlocks * dev->chunkBitmapStride;
-		ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
+	if (erasedOk &&
+	    ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
+		int i;
+		for (i = 0; i < dev->param.nChunksPerBlock; i++) {
+			if (!yaffs_CheckChunkErased
+			    (dev, blockNo * dev->param.nChunksPerBlock + i)) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   (">>Block %d erasure supposedly OK, but chunk %d not erased"
+				    TENDSTR), blockNo, i));
+			}
+		}
 	}
-	return	 ok ? 1 : 0;
 
+	if (erasedOk) {
+		/* Clean it up... */
+		bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+		bi->sequenceNumber = 0;
+		dev->nErasedBlocks++;
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+		bi->hasShrinkHeader = 0;
+		bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
+		bi->gcPrioritise = 0;
+		yaffs_ClearChunkBits(dev, blockNo);
+
+		T(YAFFS_TRACE_ERASE,
+		  (TSTR("Erased block %d" TENDSTR), blockNo));
+	} else {
+		dev->nFreeChunks -= dev->param.nChunksPerBlock;	/* We lost a block of free space */
+
+		yaffs_RetireBlock(dev, blockNo);
+		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  (TSTR("**>> Block %d retired" TENDSTR), blockNo));
+	}
 }
 
-static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
+static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
 {
-	yaffs_CheckpointDevice cp;
-	__u32 nBytes;
-	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
-
-	int ok;
+	int i;
 
-	ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
-	if (!ok)
-		return 0;
+	yaffs_BlockInfo *bi;
 
-	if (cp.structType != sizeof(cp))
-		return 0;
+	if (dev->nErasedBlocks < 1) {
+		/* Hoosterman we've got a problem.
+		 * Can't get space to gc
+		 */
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
 
+		return -1;
+	}
 
-	yaffs_CheckpointDeviceToDevice(dev, &cp);
+	/* Find an empty block. */
 
-	nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+		dev->allocationBlockFinder++;
+		if (dev->allocationBlockFinder < dev->internalStartBlock
+		    || dev->allocationBlockFinder > dev->internalEndBlock) {
+			dev->allocationBlockFinder = dev->internalStartBlock;
+		}
 
-	ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
+		bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
 
-	if (!ok)
-		return 0;
-	nBytes = nBlocks * dev->chunkBitmapStride;
+		if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
+			bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
+			dev->sequenceNumber++;
+			bi->sequenceNumber = dev->sequenceNumber;
+			dev->nErasedBlocks--;
+			T(YAFFS_TRACE_ALLOCATE,
+			  (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
+			   dev->allocationBlockFinder, dev->sequenceNumber,
+			   dev->nErasedBlocks));
+			return dev->allocationBlockFinder;
+		}
+	}
 
-	ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR
+	   ("yaffs tragedy: no more erased blocks, but there should have been %d"
+	    TENDSTR), dev->nErasedBlocks));
 
-	return ok ? 1 : 0;
+	return -1;
 }
 
-static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
-					   yaffs_Object *obj)
+
+/*
+ * Check if there's space to allocate...
+ * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
+ */
+int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
 {
+	int reservedChunks;
+	int reservedBlocks = dev->param.nReservedBlocks;
+	int checkpointBlocks;
 
-	cp->objectId = obj->objectId;
-	cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
-	cp->hdrChunk = obj->hdrChunk;
-	cp->variantType = obj->variantType;
-	cp->deleted = obj->deleted;
-	cp->softDeleted = obj->softDeleted;
-	cp->unlinked = obj->unlinked;
-	cp->fake = obj->fake;
-	cp->renameAllowed = obj->renameAllowed;
-	cp->unlinkAllowed = obj->unlinkAllowed;
-	cp->serial = obj->serial;
-	cp->nDataChunks = obj->nDataChunks;
+	checkpointBlocks = yaffs2_CalcCheckpointBlocksRequired(dev);
 
-	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-		cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
-	else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
-		cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
+	reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
+
+	return (dev->nFreeChunks > (reservedChunks + nChunks));
 }
 
-static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
+static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
+		yaffs_BlockInfo **blockUsedPtr)
 {
+	int retVal;
+	yaffs_BlockInfo *bi;
 
-	yaffs_Object *parent;
+	if (dev->allocationBlock < 0) {
+		/* Get next block to allocate off */
+		dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
+		dev->allocationPage = 0;
+	}
 
-	if (obj->variantType != cp->variantType) {
-		T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
-			TCONT("chunk %d does not match existing object type %d")
-			TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
-			obj->variantType));
-		return 0;
+	if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
+		/* Not enough space to allocate unless we're allowed to use the reserve. */
+		return -1;
 	}
 
-	obj->objectId = cp->objectId;
+	if (dev->nErasedBlocks < dev->param.nReservedBlocks
+			&& dev->allocationPage == 0) {
+		T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
+	}
 
-	if (cp->parentId)
-		parent = yaffs_FindOrCreateObjectByNumber(
-					obj->myDev,
-					cp->parentId,
-					YAFFS_OBJECT_TYPE_DIRECTORY);
-	else
-		parent = NULL;
+	/* Next page please.... */
+	if (dev->allocationBlock >= 0) {
+		bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
 
-	if (parent) {
-		if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-			T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
-				TCONT(" chunk %d Parent type, %d, not directory")
-				TENDSTR),
-				cp->objectId, cp->parentId, cp->variantType,
-				cp->hdrChunk, parent->variantType));
-			return 0;
-		}
-		yaffs_AddObjectToDirectory(parent, obj);
-	}
+		retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
+			dev->allocationPage;
+		bi->pagesInUse++;
+		yaffs_SetChunkBit(dev, dev->allocationBlock,
+				dev->allocationPage);
 
-	obj->hdrChunk = cp->hdrChunk;
-	obj->variantType = cp->variantType;
-	obj->deleted = cp->deleted;
-	obj->softDeleted = cp->softDeleted;
-	obj->unlinked = cp->unlinked;
-	obj->fake = cp->fake;
-	obj->renameAllowed = cp->renameAllowed;
-	obj->unlinkAllowed = cp->unlinkAllowed;
-	obj->serial = cp->serial;
-	obj->nDataChunks = cp->nDataChunks;
+		dev->allocationPage++;
 
-	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-		obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
-	else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
-		obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
+		dev->nFreeChunks--;
 
-	if (obj->hdrChunk > 0)
-		obj->lazyLoaded = 1;
-	return 1;
-}
+		/* If the block is full set the state to full */
+		if (dev->allocationPage >= dev->param.nChunksPerBlock) {
+			bi->blockState = YAFFS_BLOCK_STATE_FULL;
+			dev->allocationBlock = -1;
+		}
 
+		if (blockUsedPtr)
+			*blockUsedPtr = bi;
 
+		return retVal;
+	}
 
-static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
-					__u32 level, int chunkOffset)
-{
-	int i;
-	yaffs_Device *dev = in->myDev;
-	int ok = 1;
-	int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+	T(YAFFS_TRACE_ERROR,
+			(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
 
-	if (tnodeSize < sizeof(yaffs_Tnode))
-		tnodeSize = sizeof(yaffs_Tnode);
+	return -1;
+}
 
+static int yaffs_GetErasedChunks(yaffs_Device *dev)
+{
+	int n;
 
-	if (tn) {
-		if (level > 0) {
+	n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
 
-			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
-				if (tn->internal[i]) {
-					ok = yaffs_CheckpointTnodeWorker(in,
-							tn->internal[i],
-							level - 1,
-							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
-				}
-			}
-		} else if (level == 0) {
-			__u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
-			ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
-			if (ok)
-				ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
-		}
-	}
+	if (dev->allocationBlock > 0)
+		n += (dev->param.nChunksPerBlock - dev->allocationPage);
 
-	return ok;
+	return n;
 
 }
 
-static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
+/*
+ * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
+ * if we don't want to write to it.
+ */
+void yaffs_SkipRestOfBlock(yaffs_Device *dev)
 {
-	__u32 endMarker = ~0;
-	int ok = 1;
-
-	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-		ok = yaffs_CheckpointTnodeWorker(obj,
-					    obj->variant.fileVariant.top,
-					    obj->variant.fileVariant.topLevel,
-					    0);
-		if (ok)
-			ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
-				sizeof(endMarker));
+	if(dev->allocationBlock > 0){
+		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
+		if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
+			bi->blockState = YAFFS_BLOCK_STATE_FULL;
+			dev->allocationBlock = -1;
+		}
 	}
-
-	return ok ? 1 : 0;
 }
 
-static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
-{
-	__u32 baseChunk;
-	int ok = 1;
-	yaffs_Device *dev = obj->myDev;
-	yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
-	yaffs_Tnode *tn;
-	int nread = 0;
-	int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
 
-	if (tnodeSize < sizeof(yaffs_Tnode))
-		tnodeSize = sizeof(yaffs_Tnode);
+static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
+		int wholeBlock)
+{
+	int oldChunk;
+	int newChunk;
+	int markNAND;
+	int retVal = YAFFS_OK;
+	int i;
+	int isCheckpointBlock;
+	int matchingChunk;
+	int maxCopies;
 
-	ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
+	int chunksBefore = yaffs_GetErasedChunks(dev);
+	int chunksAfter;
 
-	while (ok && (~baseChunk)) {
-		nread++;
-		/* Read level 0 tnode */
+	yaffs_ExtendedTags tags;
 
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
 
-		tn = yaffs_GetTnodeRaw(dev);
-		if (tn)
-			ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
-		else
-			ok = 0;
+	yaffs_Object *object;
 
-		if (tn && ok)
-			ok = yaffs_AddOrFindLevel0Tnode(dev,
-							fileStructPtr,
-							baseChunk,
-							tn) ? 1 : 0;
+	isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
 
-		if (ok)
-			ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
 
-	}
+	T(YAFFS_TRACE_TRACING,
+			(TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
+			 block,
+			 bi->pagesInUse,
+			 bi->hasShrinkHeader,
+			 wholeBlock));
 
-	T(YAFFS_TRACE_CHECKPOINT, (
-		TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
-		nread, baseChunk, ok));
+	/*yaffs_VerifyFreeChunks(dev); */
 
-	return ok ? 1 : 0;
-}
+	if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
+		bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
+	
+	bi->hasShrinkHeader = 0;	/* clear the flag so that the block can erase */
 
+	dev->gcDisable = 1;
 
-static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
-{
-	yaffs_Object *obj;
-	yaffs_CheckpointObject cp;
-	int i;
-	int ok = 1;
-	struct ylist_head *lh;
+	if (isCheckpointBlock ||
+			!yaffs_StillSomeChunkBits(dev, block)) {
+		T(YAFFS_TRACE_TRACING,
+				(TSTR
+				 ("Collecting block %d that has no chunks in use" TENDSTR),
+				 block));
+		yaffs_BlockBecameDirty(dev, block);
+	} else {
 
+		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 
-	/* Iterate through the objects in each hash entry,
-	 * dumping them to the checkpointing stream.
-	 */
+		yaffs_VerifyBlock(dev, bi, block);
 
-	for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
-		ylist_for_each(lh, &dev->objectBucket[i].list) {
-			if (lh) {
-				obj = ylist_entry(lh, yaffs_Object, hashLink);
-				if (!obj->deferedFree) {
-					yaffs_ObjectToCheckpointObject(&cp, obj);
-					cp.structType = sizeof(cp);
-
-					T(YAFFS_TRACE_CHECKPOINT, (
-						TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
-						cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, (unsigned) obj));
+		maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 5;
+		oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
 
-					ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+		for (/* init already done */;
+		     retVal == YAFFS_OK &&
+		     dev->gcChunk < dev->param.nChunksPerBlock &&
+		     (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
+		     maxCopies > 0;
+		     dev->gcChunk++, oldChunk++) {
+			if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
 
-					if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-						ok = yaffs_WriteCheckpointTnodes(obj);
-				}
-			}
-		}
-	}
+				/* This page is in use and might need to be copied off */
 
-	/* Dump end of list */
-	memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
-	cp.structType = sizeof(cp);
+				maxCopies--;
 
-	if (ok)
-		ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+				markNAND = 1;
 
-	return ok ? 1 : 0;
-}
+				yaffs_InitialiseTags(&tags);
 
-static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
-{
-	yaffs_Object *obj;
-	yaffs_CheckpointObject cp;
-	int ok = 1;
-	int done = 0;
-	yaffs_Object *hardList = NULL;
+				yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
+								buffer, &tags);
 
-	while (ok && !done) {
-		ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
-		if (cp.structType != sizeof(cp)) {
-			T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
-				cp.structType, sizeof(cp), ok));
-			ok = 0;
-		}
-
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
-			cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
-
-		if (ok && cp.objectId == ~0)
-			done = 1;
-		else if (ok) {
-			obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
-			if (obj) {
-				ok = yaffs_CheckpointObjectToObject(obj, &cp);
-				if (!ok)
-					break;
-				if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-					ok = yaffs_ReadCheckpointTnodes(obj);
-				} else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-					obj->hardLinks.next =
-						(struct ylist_head *) hardList;
-					hardList = obj;
-				}
-			} else
-				ok = 0;
-		}
-	}
+				object =
+				    yaffs_FindObjectByNumber(dev,
+							     tags.objectId);
 
-	if (ok)
-		yaffs_HardlinkFixup(dev, hardList);
+				T(YAFFS_TRACE_GC_DETAIL,
+				  (TSTR
+				   ("Collecting chunk in block %d, %d %d %d " TENDSTR),
+				   dev->gcChunk, tags.objectId, tags.chunkId,
+				   tags.byteCount));
 
-	return ok ? 1 : 0;
-}
+				if (object && !yaffs_SkipVerification(dev)) {
+					if (tags.chunkId == 0)
+						matchingChunk = object->hdrChunk;
+					else if (object->softDeleted)
+						matchingChunk = oldChunk; /* Defeat the test */
+					else
+						matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
 
-static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
-{
-	__u32 checkpointSum;
-	int ok;
+					if (oldChunk != matchingChunk)
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
+						  oldChunk, matchingChunk, tags.objectId, tags.chunkId));
 
-	yaffs_GetCheckpointSum(dev, &checkpointSum);
+				}
 
-	ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
+				if (!object) {
+					T(YAFFS_TRACE_ERROR,
+					  (TSTR
+					   ("page %d in gc has no object: %d %d %d "
+					    TENDSTR), oldChunk,
+					    tags.objectId, tags.chunkId, tags.byteCount));
+				}
 
-	if (!ok)
-		return 0;
+				if (object &&
+				    object->deleted &&
+				    object->softDeleted &&
+				    tags.chunkId != 0) {
+					/* Data chunk in a soft deleted file, throw it away
+					 * It's a soft deleted data chunk,
+					 * No need to copy this, just forget about it and
+					 * fix up the object.
+					 */
+					 
+					/* Free chunks already includes softdeleted chunks.
+					 * How ever this chunk is going to soon be really deleted
+					 * which will increment free chunks.
+					 * We have to decrement free chunks so this works out properly.
+					 */
+					dev->nFreeChunks--;
+					bi->softDeletions--;
 
-	return 1;
-}
+					object->nDataChunks--;
 
-static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
-{
-	__u32 checkpointSum0;
-	__u32 checkpointSum1;
-	int ok;
+					if (object->nDataChunks <= 0) {
+						/* remeber to clean up the object */
+						dev->gcCleanupList[dev->nCleanups] =
+						    tags.objectId;
+						dev->nCleanups++;
+					}
+					markNAND = 0;
+				} else if (0) {
+					/* Todo object && object->deleted && object->nDataChunks == 0 */
+					/* Deleted object header with no data chunks.
+					 * Can be discarded and the file deleted.
+					 */
+					object->hdrChunk = 0;
+					yaffs_FreeTnode(object->myDev,
+							object->variant.
+							fileVariant.top);
+					object->variant.fileVariant.top = NULL;
+					yaffs_DoGenericObjectDeletion(object);
 
-	yaffs_GetCheckpointSum(dev, &checkpointSum0);
+				} else if (object) {
+					/* It's either a data chunk in a live file or
+					 * an ObjectHeader, so we're interested in it.
+					 * NB Need to keep the ObjectHeaders of deleted files
+					 * until the whole file has been deleted off
+					 */
+					tags.serialNumber++;
 
-	ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
+					dev->nGCCopies++;
 
-	if (!ok)
-		return 0;
+					if (tags.chunkId == 0) {
+						/* It is an object Id,
+						 * We need to nuke the shrinkheader flags first
+						 * Also need to clean up shadowing.
+						 * We no longer want the shrinkHeader flag since its work is done
+						 * and if it is left in place it will mess up scanning.
+						 */
 
-	if (checkpointSum0 != checkpointSum1)
-		return 0;
+						yaffs_ObjectHeader *oh;
+						oh = (yaffs_ObjectHeader *)buffer;
 
-	return 1;
-}
+						oh->isShrink = 0;
+						tags.extraIsShrinkHeader = 0;
 
+						oh->shadowsObject = 0;
+						oh->inbandShadowsObject = 0;
+						tags.extraShadows = 0;
+
+						/* Update file size */
+						if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
+							oh->fileSize = object->variant.fileVariant.fileSize;
+							tags.extraFileLength = oh->fileSize;
+						}
 
-static int yaffs_WriteCheckpointData(yaffs_Device *dev)
-{
-	int ok = 1;
+						yaffs_VerifyObjectHeader(object, oh, &tags, 1);
+						newChunk =
+						    yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
+					} else
+						newChunk =
+						    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
 
-	if (dev->skipCheckpointWrite || !dev->isYaffs2) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
-		ok = 0;
-	}
+					if (newChunk < 0) {
+						retVal = YAFFS_FAIL;
+					} else {
 
-	if (ok)
-		ok = yaffs_CheckpointOpen(dev, 1);
+						/* Ok, now fix up the Tnodes etc. */
 
-	if (ok) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
-		ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
-	}
-	if (ok) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
-		ok = yaffs_WriteCheckpointDevice(dev);
-	}
-	if (ok) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
-		ok = yaffs_WriteCheckpointObjects(dev);
-	}
-	if (ok) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
-		ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
-	}
+						if (tags.chunkId == 0) {
+							/* It's a header */
+							object->hdrChunk =  newChunk;
+							object->serial =   tags.serialNumber;
+						} else {
+							/* It's a data chunk */
+							int ok;
+							ok = yaffs_PutChunkIntoFile
+							    (object,
+							     tags.chunkId,
+							     newChunk, 0);
+						}
+					}
+				}
 
-	if (ok)
-		ok = yaffs_WriteCheckpointSum(dev);
+				if (retVal == YAFFS_OK)
+					yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
 
-	if (!yaffs_CheckpointClose(dev))
-		ok = 0;
+			}
+		}
 
-	if (ok)
-		dev->isCheckpointed = 1;
-	else
-		dev->isCheckpointed = 0;
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 
-	return dev->isCheckpointed;
-}
 
-static int yaffs_ReadCheckpointData(yaffs_Device *dev)
-{
-	int ok = 1;
 
-	if (dev->skipCheckpointRead || !dev->isYaffs2) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
-		ok = 0;
 	}
 
-	if (ok)
-		ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
-
-	if (ok) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
-		ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
-	}
-	if (ok) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
-		ok = yaffs_ReadCheckpointDevice(dev);
-	}
-	if (ok) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
-		ok = yaffs_ReadCheckpointObjects(dev);
-	}
-	if (ok) {
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
-		ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
-	}
+	yaffs_VerifyCollectedBlock(dev, bi, block);
 
-	if (ok) {
-		ok = yaffs_ReadCheckpointSum(dev);
-		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
-	}
 
-	if (!yaffs_CheckpointClose(dev))
-		ok = 0;
 
-	if (ok)
-		dev->isCheckpointed = 1;
-	else
-		dev->isCheckpointed = 0;
+	if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
+		/*
+		 * The gc did not complete. Set block state back to FULL
+		 * because checkpointing does not restore gc.
+		 */
+		bi->blockState = YAFFS_BLOCK_STATE_FULL;
+	} else {
+		/* The gc completed. */
+		/* Do any required cleanups */
+		for (i = 0; i < dev->nCleanups; i++) {
+			/* Time to delete the file too */
+			object =
+			    yaffs_FindObjectByNumber(dev,
+						     dev->gcCleanupList[i]);
+			if (object) {
+				yaffs_FreeTnode(dev,
+						object->variant.fileVariant.
+						top);
+				object->variant.fileVariant.top = NULL;
+				T(YAFFS_TRACE_GC,
+				  (TSTR
+				   ("yaffs: About to finally delete object %d"
+				    TENDSTR), object->objectId));
+				yaffs_DoGenericObjectDeletion(object);
+				object->myDev->nDeletedFiles--;
+			}
 
-	return ok ? 1 : 0;
+		}
 
-}
 
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
-{
-	if (dev->isCheckpointed ||
-			dev->blocksInCheckpoint > 0) {
-		dev->isCheckpointed = 0;
-		yaffs_CheckpointInvalidateStream(dev);
-		if (dev->superBlock && dev->markSuperBlockDirty)
-			dev->markSuperBlockDirty(dev->superBlock);
+		chunksAfter = yaffs_GetErasedChunks(dev);
+		if (chunksBefore >= chunksAfter) {
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("gc did not increase free chunks before %d after %d"
+			    TENDSTR), chunksBefore, chunksAfter));
+		}
+		dev->gcBlock = 0;
+		dev->gcChunk = 0;
+		dev->nCleanups = 0;
 	}
-}
 
+	dev->gcDisable = 0;
 
-int yaffs_CheckpointSave(yaffs_Device *dev)
-{
-
-	T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+	return retVal;
+}
 
-	yaffs_VerifyObjects(dev);
-	yaffs_VerifyBlocks(dev);
-	yaffs_VerifyFreeChunks(dev);
+/*
+ * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
+ * for garbage collection.
+ */
 
-	if (!dev->isCheckpointed) {
-		yaffs_InvalidateCheckpoint(dev);
-		yaffs_WriteCheckpointData(dev);
-	}
+static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
+					int aggressive,
+					int background)
+{
+	int i;
+	int iterations;
+	unsigned selected = 0;
+	int prioritised = 0;
+	int prioritisedExists = 0;
+	yaffs_BlockInfo *bi;
+	int threshold;
 
-	T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+	/* First let's see if we need to grab a prioritised block */
+	if (dev->hasPendingPrioritisedGCs && !aggressive) {
+		dev->gcDirtiest = 0;
+		bi = dev->blockInfo;
+		for (i = dev->internalStartBlock;
+			i <= dev->internalEndBlock && !selected;
+			i++) {
 
-	return dev->isCheckpointed;
-}
+			if (bi->gcPrioritise) {
+				prioritisedExists = 1;
+				if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+				   yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) {
+					selected = i;
+					prioritised = 1;
+				}
+			}
+			bi++;
+		}
 
-int yaffs_CheckpointRestore(yaffs_Device *dev)
-{
-	int retval;
-	T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+		/*
+		 * If there is a prioritised block and none was selected then
+		 * this happened because there is at least one old dirty block gumming
+		 * up the works. Let's gc the oldest dirty block.
+		 */
 
-	retval = yaffs_ReadCheckpointData(dev);
+		if(prioritisedExists &&
+			!selected &&
+			dev->oldestDirtyBlock > 0)
+			selected = dev->oldestDirtyBlock;
 
-	if (dev->isCheckpointed) {
-		yaffs_VerifyObjects(dev);
-		yaffs_VerifyBlocks(dev);
-		yaffs_VerifyFreeChunks(dev);
+		if (!prioritisedExists) /* None found, so we can clear this */
+			dev->hasPendingPrioritisedGCs = 0;
 	}
 
-	T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+	/* If we're doing aggressive GC then we are happy to take a less-dirty block, and
+	 * search harder.
+	 * else (we're doing a leasurely gc), then we only bother to do this if the
+	 * block has only a few pages in use.
+	 */
 
-	return retval;
-}
+	if (!selected){
+		int pagesUsed;
+		int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+		if (aggressive){
+			threshold = dev->param.nChunksPerBlock;
+			iterations = nBlocks;
+		} else {
+			int maxThreshold;
 
-/*--------------------- File read/write ------------------------
- * Read and write have very similar structures.
- * In general the read/write has three parts to it
- * An incomplete chunk to start with (if the read/write is not chunk-aligned)
- * Some complete chunks
- * An incomplete chunk to end off with
- *
- * Curve-balls: the first chunk might also be the last chunk.
- */
+			if(background)
+				maxThreshold = dev->param.nChunksPerBlock/2;
+			else
+				maxThreshold = dev->param.nChunksPerBlock/8;
 
-int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
-			int nBytes)
-{
+			if(maxThreshold <  YAFFS_GC_PASSIVE_THRESHOLD)
+				maxThreshold = YAFFS_GC_PASSIVE_THRESHOLD;
 
-	int chunk;
-	__u32 start;
-	int nToCopy;
-	int n = nBytes;
-	int nDone = 0;
-	yaffs_ChunkCache *cache;
+			threshold = background ?
+				(dev->gcNotDone + 2) * 2 : 0;
+			if(threshold <YAFFS_GC_PASSIVE_THRESHOLD)
+				threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+			if(threshold > maxThreshold)
+				threshold = maxThreshold;
 
-	yaffs_Device *dev;
+			iterations = nBlocks / 16 + 1;
+			if (iterations > 100)
+				iterations = 100;
+		}
 
-	dev = in->myDev;
+		for (i = 0;
+			i < iterations &&
+			(dev->gcDirtiest < 1 ||
+				dev->gcPagesInUse > YAFFS_GC_GOOD_ENOUGH);
+			i++) {
+			dev->gcBlockFinder++;
+			if (dev->gcBlockFinder < dev->internalStartBlock ||
+				dev->gcBlockFinder > dev->internalEndBlock)
+				dev->gcBlockFinder = dev->internalStartBlock;
 
-	while (n > 0) {
-		/* chunk = offset / dev->nDataBytesPerChunk + 1; */
-		/* start = offset % dev->nDataBytesPerChunk; */
-		yaffs_AddrToChunk(dev, offset, &chunk, &start);
-		chunk++;
+			bi = yaffs_GetBlockInfo(dev, dev->gcBlockFinder);
 
-		/* OK now check for the curveball where the start and end are in
-		 * the same chunk.
-		 */
-		if ((start + n) < dev->nDataBytesPerChunk)
-			nToCopy = n;
-		else
-			nToCopy = dev->nDataBytesPerChunk - start;
+			pagesUsed = bi->pagesInUse - bi->softDeletions;
 
-		cache = yaffs_FindChunkCache(in, chunk);
+			if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+				pagesUsed < dev->param.nChunksPerBlock &&
+				(dev->gcDirtiest < 1 || pagesUsed < dev->gcPagesInUse) &&
+				yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) {
+				dev->gcDirtiest = dev->gcBlockFinder;
+				dev->gcPagesInUse = pagesUsed;
+			}
+		}
 
-		/* If the chunk is already in the cache or it is less than a whole chunk
-		 * or we're using inband tags then use the cache (if there is caching)
-		 * else bypass the cache.
-		 */
-		if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
-			if (dev->nShortOpCaches > 0) {
+		if(dev->gcDirtiest > 0 && dev->gcPagesInUse <= threshold)
+			selected = dev->gcDirtiest;
+	}
+
+	/*
+	 * If nothing has been selected for a while, try selecting the oldest dirty
+	 * because that's gumming up the works.
+	 */
 
-				/* If we can't find the data in the cache, then load it up. */
+	if(!selected && dev->param.isYaffs2 &&
+		dev->gcNotDone >= ( background ? 10 : 20)){
+		yaffs2_FindOldestDirtySequence(dev);
+		if(dev->oldestDirtyBlock > 0) {
+			selected = dev->oldestDirtyBlock;
+			dev->gcDirtiest = selected;
+			dev->oldestDirtyGCs++;
+			bi = yaffs_GetBlockInfo(dev, selected);
+			dev->gcPagesInUse =  bi->pagesInUse - bi->softDeletions;
+		} else
+			dev->gcNotDone = 0;
+	}
 
-				if (!cache) {
-					cache = yaffs_GrabChunkCache(in->myDev);
-					cache->object = in;
-					cache->chunkId = chunk;
-					cache->dirty = 0;
-					cache->locked = 0;
-					yaffs_ReadChunkDataFromObject(in, chunk,
-								      cache->
-								      data);
-					cache->nBytes = 0;
-				}
+	if(selected){
+		T(YAFFS_TRACE_GC,
+		  (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR),
+		  selected,
+		  dev->param.nChunksPerBlock - dev->gcPagesInUse,
+		  prioritised));
+
+		dev->nGCBlocks++;
+		if(background)
+			dev->backgroundGCs++;
+
+		dev->gcDirtiest = 0;
+		dev->gcPagesInUse = 0;
+		dev->gcNotDone = 0;
+		if(dev->refreshSkip > 0)
+			dev->refreshSkip--;
+	} else{
+		dev->gcNotDone++;
+		T(YAFFS_TRACE_GC,
+		  (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR),
+		  dev->gcBlockFinder, dev->gcNotDone,
+		  threshold,
+		  dev->gcDirtiest, dev->gcPagesInUse,
+		  dev->oldestDirtyBlock,
+		  background ? " bg" : ""));
+	}
 
-				yaffs_UseChunkCache(dev, cache, 0);
+	return selected;
+}
 
-				cache->locked = 1;
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and will only accept more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
+{
+	int aggressive = 0;
+	int gcOk = YAFFS_OK;
+	int maxTries = 0;
+	int minErased;
+	int erasedChunks;
+	int checkpointBlockAdjust;
 
+	if(dev->param.gcControl &&
+		(dev->param.gcControl(dev) & 1) == 0)
+		return YAFFS_OK;
 
-				memcpy(buffer, &cache->data[start], nToCopy);
+	if (dev->gcDisable) {
+		/* Bail out so we don't get recursive gc */
+		return YAFFS_OK;
+	}
 
-				cache->locked = 0;
-			} else {
-				/* Read into the local buffer then copy..*/
+	/* This loop should pass the first time.
+	 * We'll only see looping here if the collection does not increase space.
+	 */
 
-				__u8 *localBuffer =
-				    yaffs_GetTempBuffer(dev, __LINE__);
-				yaffs_ReadChunkDataFromObject(in, chunk,
-							      localBuffer);
+	do {
+		maxTries++;
 
-				memcpy(buffer, &localBuffer[start], nToCopy);
+		checkpointBlockAdjust = yaffs2_CalcCheckpointBlocksRequired(dev);
 
+		minErased  = dev->param.nReservedBlocks + checkpointBlockAdjust + 1;
+		erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
 
-				yaffs_ReleaseTempBuffer(dev, localBuffer,
-							__LINE__);
+		/* If we need a block soon then do aggressive gc.*/
+		if (dev->nErasedBlocks < minErased)
+			aggressive = 1;
+		else {
+			if(!background && erasedChunks > (dev->nFreeChunks / 4))
+				break;
+
+			if(dev->gcSkip > 20)
+				dev->gcSkip = 20;
+			if(erasedChunks < dev->nFreeChunks/2 ||
+				dev->gcSkip < 1 ||
+				background)
+				aggressive = 0;
+			else {
+				dev->gcSkip--;
+				break;
 			}
+		}
 
-		} else {
+		dev->gcSkip = 5;
 
-			/* A full chunk. Read directly into the supplied buffer. */
-			yaffs_ReadChunkDataFromObject(in, chunk, buffer);
+                /* If we don't already have a block being gc'd then see if we should start another */
 
+		if (dev->gcBlock < 1 && !aggressive) {
+			dev->gcBlock = yaffs2_FindRefreshBlock(dev);
+			dev->gcChunk = 0;
+			dev->nCleanups=0;
+		}
+		if (dev->gcBlock < 1) {
+			dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive, background);
+			dev->gcChunk = 0;
+			dev->nCleanups=0;
 		}
 
-		n -= nToCopy;
-		offset += nToCopy;
-		buffer += nToCopy;
-		nDone += nToCopy;
+		if (dev->gcBlock > 0) {
+			dev->allGCs++;
+			if (!aggressive)
+				dev->passiveGCs++;
 
-	}
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
+			   dev->nErasedBlocks, aggressive));
 
-	return nDone;
+			gcOk = yaffs_GarbageCollectBlock(dev, dev->gcBlock, aggressive);
+		}
+
+		if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && dev->gcBlock > 0) {
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
+			    TENDSTR), dev->nErasedBlocks, maxTries, dev->gcBlock));
+		}
+	} while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
+		 (dev->gcBlock > 0) &&
+		 (maxTries < 2));
+
+	return aggressive ? gcOk : YAFFS_OK;
 }
 
-int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
-			int nBytes, int writeThrough)
+/*
+ * yaffs_BackgroundGarbageCollect()
+ * Garbage collects. Intended to be called from a background thread.
+ * Returns non-zero if at least half the free chunks are erased.
+ */
+int yaffs_BackgroundGarbageCollect(yaffs_Device *dev, unsigned urgency)
 {
+	int erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
 
-	int chunk;
-	__u32 start;
-	int nToCopy;
-	int n = nBytes;
-	int nDone = 0;
-	int nToWriteBack;
-	int startOfWrite = offset;
-	int chunkWritten = 0;
-	__u32 nBytesRead;
-	__u32 chunkStart;
+	T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency));
 
-	yaffs_Device *dev;
+	yaffs_CheckGarbageCollection(dev, 1);
+	return erasedChunks > dev->nFreeChunks/2;
+}
 
-	dev = in->myDev;
+/*-------------------------  TAGS --------------------------------*/
 
-	while (n > 0 && chunkWritten >= 0) {
-		/* chunk = offset / dev->nDataBytesPerChunk + 1; */
-		/* start = offset % dev->nDataBytesPerChunk; */
-		yaffs_AddrToChunk(dev, offset, &chunk, &start);
+static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
+			   int chunkInObject)
+{
+	return (tags->chunkId == chunkInObject &&
+		tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
 
-		if (chunk * dev->nDataBytesPerChunk + start != offset ||
-				start >= dev->nDataBytesPerChunk) {
-			T(YAFFS_TRACE_ERROR, (
-			   TSTR("AddrToChunk of offset %d gives chunk %d start %d"
-			   TENDSTR),
-			   (int)offset, chunk, start));
-		}
-		chunk++;
+}
 
-		/* OK now check for the curveball where the start and end are in
-		 * the same chunk.
-		 */
 
-		if ((start + n) < dev->nDataBytesPerChunk) {
-			nToCopy = n;
+/*-------------------- Data file manipulation -----------------*/
 
-			/* Now folks, to calculate how many bytes to write back....
-			 * If we're overwriting and not writing to then end of file then
-			 * we need to write back as much as was there before.
-			 */
+static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
+				 yaffs_ExtendedTags *tags)
+{
+	/*Get the Tnode, then get the level 0 offset chunk offset */
+	yaffs_Tnode *tn;
+	int theChunk = -1;
+	yaffs_ExtendedTags localTags;
+	int retVal = -1;
 
-			chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
+	yaffs_Device *dev = in->myDev;
 
-			if (chunkStart > in->variant.fileVariant.fileSize)
-				nBytesRead = 0; /* Past end of file */
-			else
-				nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &localTags;
+	}
 
-			if (nBytesRead > dev->nDataBytesPerChunk)
-				nBytesRead = dev->nDataBytesPerChunk;
+	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
 
-			nToWriteBack =
-			    (nBytesRead >
-			     (start + n)) ? nBytesRead : (start + n);
+	if (tn) {
+		theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
 
-			if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
-				YBUG();
+		retVal =
+		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+					   chunkInInode);
+	}
+	return retVal;
+}
 
-		} else {
-			nToCopy = dev->nDataBytesPerChunk - start;
-			nToWriteBack = dev->nDataBytesPerChunk;
-		}
+static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
+					  yaffs_ExtendedTags *tags)
+{
+	/* Get the Tnode, then get the level 0 offset chunk offset */
+	yaffs_Tnode *tn;
+	int theChunk = -1;
+	yaffs_ExtendedTags localTags;
 
-		if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
-			/* An incomplete start or end chunk (or maybe both start and end chunk),
-			 * or we're using inband tags, so we want to use the cache buffers.
-			 */
-			if (dev->nShortOpCaches > 0) {
-				yaffs_ChunkCache *cache;
-				/* If we can't find the data in the cache, then load the cache */
-				cache = yaffs_FindChunkCache(in, chunk);
+	yaffs_Device *dev = in->myDev;
+	int retVal = -1;
 
-				if (!cache
-				    && yaffs_CheckSpaceForAllocation(in->
-								     myDev)) {
-					cache = yaffs_GrabChunkCache(in->myDev);
-					cache->object = in;
-					cache->chunkId = chunk;
-					cache->dirty = 0;
-					cache->locked = 0;
-					yaffs_ReadChunkDataFromObject(in, chunk,
-								      cache->
-								      data);
-				} else if (cache &&
-					!cache->dirty &&
-					!yaffs_CheckSpaceForAllocation(in->myDev)) {
-					/* Drop the cache if it was a read cache item and
-					 * no space check has been made for it.
-					 */
-					 cache = NULL;
-				}
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &localTags;
+	}
 
-				if (cache) {
-					yaffs_UseChunkCache(dev, cache, 1);
-					cache->locked = 1;
+	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
 
+	if (tn) {
 
-					memcpy(&cache->data[start], buffer,
-					       nToCopy);
+		theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
 
+		retVal =
+		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+					   chunkInInode);
 
-					cache->locked = 0;
-					cache->nBytes = nToWriteBack;
+		/* Delete the entry in the filestructure (if found) */
+		if (retVal != -1)
+			yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
+	}
 
-					if (writeThrough) {
-						chunkWritten =
-						    yaffs_WriteChunkDataToObject
-						    (cache->object,
-						     cache->chunkId,
-						     cache->data, cache->nBytes,
-						     1);
-						cache->dirty = 0;
-					}
+	return retVal;
+}
 
-				} else {
-					chunkWritten = -1;	/* fail the write */
-				}
-			} else {
-				/* An incomplete start or end chunk (or maybe both start and end chunk)
-				 * Read into the local buffer then copy, then copy over and write back.
-				 */
 
-				__u8 *localBuffer =
-				    yaffs_GetTempBuffer(dev, __LINE__);
+int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
+			        int chunkInNAND, int inScan)
+{
+	/* NB inScan is zero unless scanning.
+	 * For forward scanning, inScan is > 0;
+	 * for backward scanning inScan is < 0
+	 *
+	 * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
+	 */
+
+	yaffs_Tnode *tn;
+	yaffs_Device *dev = in->myDev;
+	int existingChunk;
+	yaffs_ExtendedTags existingTags;
+	yaffs_ExtendedTags newTags;
+	unsigned existingSerial, newSerial;
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+		/* Just ignore an attempt at putting a chunk into a non-file during scanning
+		 * If it is not during Scanning then something went wrong!
+		 */
+		if (!inScan) {
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR
+			   ("yaffs tragedy:attempt to put data chunk into a non-file"
+			    TENDSTR)));
+			YBUG();
+		}
 
-				yaffs_ReadChunkDataFromObject(in, chunk,
-							      localBuffer);
+		yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+		return YAFFS_OK;
+	}
 
+	tn = yaffs_AddOrFindLevel0Tnode(dev,
+					&in->variant.fileVariant,
+					chunkInInode,
+					NULL);
+	if (!tn)
+		return YAFFS_FAIL;
+	
+	if(!chunkInNAND)
+		/* Dummy insert, bail now */
+		return YAFFS_OK;
 
+	existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
 
-				memcpy(&localBuffer[start], buffer, nToCopy);
+	if (inScan != 0) {
+		/* If we're scanning then we need to test for duplicates
+		 * NB This does not need to be efficient since it should only ever
+		 * happen when the power fails during a write, then only one
+		 * chunk should ever be affected.
+		 *
+		 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+		 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+		 */
 
-				chunkWritten =
-				    yaffs_WriteChunkDataToObject(in, chunk,
-								 localBuffer,
-								 nToWriteBack,
-								 0);
+		if (existingChunk > 0) {
+			/* NB Right now existing chunk will not be real chunkId if the chunk group size > 1
+			 *    thus we have to do a FindChunkInFile to get the real chunk id.
+			 *
+			 * We have a duplicate now we need to decide which one to use:
+			 *
+			 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+			 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
+			 * YAFFS1: Get both sets of tags and compare serial numbers.
+			 */
 
-				yaffs_ReleaseTempBuffer(dev, localBuffer,
-							__LINE__);
+			if (inScan > 0) {
+				/* Only do this for forward scanning */
+				yaffs_ReadChunkWithTagsFromNAND(dev,
+								chunkInNAND,
+								NULL, &newTags);
 
+				/* Do a proper find */
+				existingChunk =
+				    yaffs_FindChunkInFile(in, chunkInInode,
+							  &existingTags);
 			}
 
-		} else {
-			/* A full chunk. Write directly from the supplied buffer. */
+			if (existingChunk <= 0) {
+				/*Hoosterman - how did this happen? */
 
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("yaffs tragedy: existing chunk < 0 in scan"
+				    TENDSTR)));
 
+			}
 
-			chunkWritten =
-			    yaffs_WriteChunkDataToObject(in, chunk, buffer,
-							 dev->nDataBytesPerChunk,
-							 0);
+			/* NB The deleted flags should be false, otherwise the chunks will
+			 * not be loaded during a scan
+			 */
 
-			/* Since we've overwritten the cached data, we better invalidate it. */
-			yaffs_InvalidateChunkCache(in, chunk);
-		}
+			if (inScan > 0) {
+				newSerial = newTags.serialNumber;
+				existingSerial = existingTags.serialNumber;
+			}
 
-		if (chunkWritten >= 0) {
-			n -= nToCopy;
-			offset += nToCopy;
-			buffer += nToCopy;
-			nDone += nToCopy;
+			if ((inScan > 0) &&
+			    (existingChunk <= 0 ||
+			     ((existingSerial + 1) & 3) == newSerial)) {
+				/* Forward scanning.
+				 * Use new
+				 * Delete the old one and drop through to update the tnode
+				 */
+				yaffs_DeleteChunk(dev, existingChunk, 1,
+						  __LINE__);
+			} else {
+				/* Backward scanning or we want to use the existing one
+				 * Use existing.
+				 * Delete the new one and return early so that the tnode isn't changed
+				 */
+				yaffs_DeleteChunk(dev, chunkInNAND, 1,
+						  __LINE__);
+				return YAFFS_OK;
+			}
 		}
 
 	}
 
-	/* Update file object */
-
-	if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
-		in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+	if (existingChunk == 0)
+		in->nDataChunks++;
 
-	in->dirty = 1;
+	yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
 
-	return nDone;
+	return YAFFS_OK;
 }
 
+static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
+					__u8 *buffer)
+{
+	int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
 
-/* ---------------------- File resizing stuff ------------------ */
+	if (chunkInNAND >= 0)
+		return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
+						buffer, NULL);
+	else {
+		T(YAFFS_TRACE_NANDACCESS,
+		  (TSTR("Chunk %d not found zero instead" TENDSTR),
+		   chunkInNAND));
+		/* get sane (zero) data if you read a hole */
+		memset(buffer, 0, in->myDev->nDataBytesPerChunk);
+		return 0;
+	}
 
-static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
-{
+}
 
-	yaffs_Device *dev = in->myDev;
-	int oldFileSize = in->variant.fileVariant.fileSize;
+void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
+{
+	int block;
+	int page;
+	yaffs_ExtendedTags tags;
+	yaffs_BlockInfo *bi;
 
-	int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
+	if (chunkId <= 0)
+		return;
 
-	int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
-	    dev->nDataBytesPerChunk;
-	int i;
-	int chunkId;
+	dev->nDeletions++;
+	block = chunkId / dev->param.nChunksPerBlock;
+	page = chunkId % dev->param.nChunksPerBlock;
 
-	/* Delete backwards so that we don't end up with holes if
-	 * power is lost part-way through the operation.
-	 */
-	for (i = lastDel; i >= startDel; i--) {
-		/* NB this could be optimised somewhat,
-		 * eg. could retrieve the tags and write them without
-		 * using yaffs_DeleteChunk
-		 */
 
-		chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
-		if (chunkId > 0) {
-			if (chunkId <
-			    (dev->internalStartBlock * dev->nChunksPerBlock)
-			    || chunkId >=
-			    ((dev->internalEndBlock +
-			      1) * dev->nChunksPerBlock)) {
-				T(YAFFS_TRACE_ALWAYS,
-				  (TSTR("Found daft chunkId %d for %d" TENDSTR),
-				   chunkId, i));
-			} else {
-				in->nDataChunks--;
-				yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
-			}
-		}
-	}
+	if (!yaffs_CheckChunkBit(dev, block, page))
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Deleting invalid chunk %d"TENDSTR),
+			 chunkId));
 
-}
+	bi = yaffs_GetBlockInfo(dev, block);
+	
+	yaffs2_UpdateOldestDirtySequence(dev, block, bi);
 
-int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
-{
+	T(YAFFS_TRACE_DELETION,
+	  (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
 
-	int oldFileSize = in->variant.fileVariant.fileSize;
-	__u32 newSizeOfPartialChunk;
-	int newFullChunks;
+	if (!dev->param.isYaffs2 && markNAND &&
+	    bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
 
-	yaffs_Device *dev = in->myDev;
+		yaffs_InitialiseTags(&tags);
 
-	yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
+		tags.chunkDeleted = 1;
 
-	yaffs_FlushFilesChunkCache(in);
-	yaffs_InvalidateWholeChunkCache(in);
+		yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
+		yaffs_HandleUpdateChunk(dev, chunkId, &tags);
+	} else {
+		dev->nUnmarkedDeletions++;
+	}
 
-	yaffs_CheckGarbageCollection(dev);
+	/* Pull out of the management area.
+	 * If the whole block became dirty, this will kick off an erasure.
+	 */
+	if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
+	    bi->blockState == YAFFS_BLOCK_STATE_FULL ||
+	    bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+	    bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
+		dev->nFreeChunks++;
 
-	if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
-		return YAFFS_FAIL;
+		yaffs_ClearChunkBit(dev, block, page);
 
-	if (newSize == oldFileSize)
-		return YAFFS_OK;
+		bi->pagesInUse--;
 
-	if (newSize < oldFileSize) {
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
+		    bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			yaffs_BlockBecameDirty(dev, block);
+		}
 
-		yaffs_PruneResizedChunks(in, newSize);
+	}
 
-		if (newSizeOfPartialChunk != 0) {
-			int lastChunk = 1 + newFullChunks;
+}
 
-			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
+					const __u8 *buffer, int nBytes,
+					int useReserve)
+{
+	/* Find old chunk Need to do this to get serial number
+	 * Write new one and patch into tree.
+	 * Invalidate old tags.
+	 */
 
-			/* Got to read and rewrite the last chunk with its new size and zero pad */
-			yaffs_ReadChunkDataFromObject(in, lastChunk,
-						      localBuffer);
+	int prevChunkId;
+	yaffs_ExtendedTags prevTags;
 
-			memset(localBuffer + newSizeOfPartialChunk, 0,
-			       dev->nDataBytesPerChunk - newSizeOfPartialChunk);
+	int newChunkId;
+	yaffs_ExtendedTags newTags;
 
-			yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
-						     newSizeOfPartialChunk, 1);
+	yaffs_Device *dev = in->myDev;
 
-			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
-		}
+	yaffs_CheckGarbageCollection(dev,0);
 
-		in->variant.fileVariant.fileSize = newSize;
+	/* Get the previous chunk at this location in the file if it exists.
+	 * If it does not exist then put a zero into the tree. This creates
+	 * the tnode now, rather than later when it is harder to clean up.
+	 */
+	prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
+	if(prevChunkId < 1 &&
+		!yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
+		return 0;
 
-		yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
-	} else {
-		/* newsSize > oldFileSize */
-		in->variant.fileVariant.fileSize = newSize;
-	}
+	/* Set up new tags */
+	yaffs_InitialiseTags(&newTags);
 
+	newTags.chunkId = chunkInInode;
+	newTags.objectId = in->objectId;
+	newTags.serialNumber =
+	    (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
+	newTags.byteCount = nBytes;
 
-	/* Write a new object header.
-	 * show we've shrunk the file, if need be
-	 * Do this only if the file is not in the deleted directories.
-	 */
-	if (in->parent &&
-	    in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
-	    in->parent->objectId != YAFFS_OBJECTID_DELETED)
-		yaffs_UpdateObjectHeader(in, NULL, 0,
-					 (newSize < oldFileSize) ? 1 : 0, 0);
+	if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
+		T(YAFFS_TRACE_ERROR,
+		(TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
+		YBUG();
+	}
+	
+		
+	newChunkId =
+	    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+					      useReserve);
 
-	return YAFFS_OK;
-}
+	if (newChunkId > 0) {
+		yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
 
-loff_t yaffs_GetFileSize(yaffs_Object *obj)
-{
-	obj = yaffs_GetEquivalentObject(obj);
+		if (prevChunkId > 0)
+			yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
 
-	switch (obj->variantType) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		return obj->variant.fileVariant.fileSize;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		return yaffs_strlen(obj->variant.symLinkVariant.alias);
-	default:
-		return 0;
+		yaffs_VerifyFileSanity(in);
 	}
+	return newChunkId;
+
 }
 
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
+			     int isShrink, int shadows, yaffs_XAttrMod *xmod)
+{
 
+	yaffs_BlockInfo *bi;
 
-int yaffs_FlushFile(yaffs_Object *in, int updateTime)
-{
-	int retVal;
-	if (in->dirty) {
-		yaffs_FlushFilesChunkCache(in);
-		if (updateTime) {
-#ifdef CONFIG_YAFFS_WINCE
-			yfsd_WinFileTimeNow(in->win_mtime);
-#else
+	yaffs_Device *dev = in->myDev;
 
-			in->yst_mtime = Y_CURRENT_TIME;
+	int prevChunkId;
+	int retVal = 0;
+	int result = 0;
 
-#endif
-		}
+	int newChunkId;
+	yaffs_ExtendedTags newTags;
+	yaffs_ExtendedTags oldTags;
+	const YCHAR *alias = NULL;
 
-		retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
-			0) ? YAFFS_OK : YAFFS_FAIL;
-	} else {
-		retVal = YAFFS_OK;
-	}
+	__u8 *buffer = NULL;
+	YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
 
-	return retVal;
+	yaffs_ObjectHeader *oh = NULL;
 
-}
+	yaffs_strcpy(oldName, _Y("silly old name"));
 
-static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
-{
 
-	/* First off, invalidate the file's data in the cache, without flushing. */
-	yaffs_InvalidateWholeChunkCache(in);
+	if (!in->fake ||
+		in == dev->rootDir || /* The rootDir should also be saved */
+		force  || xmod) {
 
-	if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
-		/* Move to the unlinked directory so we have a record that it was deleted. */
-		yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
+		yaffs_CheckGarbageCollection(dev,0);
+		yaffs_CheckObjectDetailsLoaded(in);
 
-	}
+		buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
+		oh = (yaffs_ObjectHeader *) buffer;
 
-	yaffs_RemoveObjectFromDirectory(in);
-	yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
-	in->hdrChunk = 0;
+		prevChunkId = in->hdrChunk;
 
-	yaffs_FreeObject(in);
-	return YAFFS_OK;
+		if (prevChunkId > 0) {
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
+							buffer, &oldTags);
 
-}
+			yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
 
-/* yaffs_DeleteFile deletes the whole file data
- * and the inode associated with the file.
- * It does not delete the links associated with the file.
- */
-static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
-{
+			memcpy(oldName, oh->name, sizeof(oh->name));
+			memset(buffer, 0xFF, sizeof(yaffs_ObjectHeader));
+		} else
+			memset(buffer, 0xFF, dev->nDataBytesPerChunk);
 
-	int retVal;
-	int immediateDeletion = 0;
+		oh->type = in->variantType;
+		oh->yst_mode = in->yst_mode;
+		oh->shadowsObject = oh->inbandShadowsObject = shadows;
 
-#ifdef __KERNEL__
-	if (!in->myInode)
-		immediateDeletion = 1;
+#ifdef CONFIG_YAFFS_WINCE
+		oh->win_atime[0] = in->win_atime[0];
+		oh->win_ctime[0] = in->win_ctime[0];
+		oh->win_mtime[0] = in->win_mtime[0];
+		oh->win_atime[1] = in->win_atime[1];
+		oh->win_ctime[1] = in->win_ctime[1];
+		oh->win_mtime[1] = in->win_mtime[1];
 #else
-	if (in->inUse <= 0)
-		immediateDeletion = 1;
+		oh->yst_uid = in->yst_uid;
+		oh->yst_gid = in->yst_gid;
+		oh->yst_atime = in->yst_atime;
+		oh->yst_mtime = in->yst_mtime;
+		oh->yst_ctime = in->yst_ctime;
+		oh->yst_rdev = in->yst_rdev;
 #endif
+		if (in->parent)
+			oh->parentObjectId = in->parent->objectId;
+		else
+			oh->parentObjectId = 0;
 
-	if (immediateDeletion) {
-		retVal =
-		    yaffs_ChangeObjectName(in, in->myDev->deletedDir,
-					   _Y("deleted"), 0, 0);
-		T(YAFFS_TRACE_TRACING,
-		  (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
-		   in->objectId));
-		in->deleted = 1;
-		in->myDev->nDeletedFiles++;
-		if (1 || in->myDev->isYaffs2)
-			yaffs_ResizeFile(in, 0);
-		yaffs_SoftDeleteFile(in);
-	} else {
-		retVal =
-		    yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
-					   _Y("unlinked"), 0, 0);
-	}
+		if (name && *name) {
+			memset(oh->name, 0, sizeof(oh->name));
+			yaffs_LoadObjectHeaderFromName(dev,oh->name,name);
+		} else if (prevChunkId > 0)
+			memcpy(oh->name, oldName, sizeof(oh->name));
+		else
+			memset(oh->name, 0, sizeof(oh->name));
 
+		oh->isShrink = isShrink;
 
-	return retVal;
-}
+		switch (in->variantType) {
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* Should not happen */
+			break;
+		case YAFFS_OBJECT_TYPE_FILE:
+			oh->fileSize =
+			    (oh->parentObjectId == YAFFS_OBJECTID_DELETED
+			     || oh->parentObjectId ==
+			     YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
+			    fileVariant.fileSize;
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+			oh->equivalentObjectId =
+			    in->variant.hardLinkVariant.equivalentObjectId;
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			/* Do nothing */
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			/* Do nothing */
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			alias = in->variant.symLinkVariant.alias;
+			if(!alias)
+				alias = _Y("no alias");
+			yaffs_strncpy(oh->alias,
+					alias,
+				      YAFFS_MAX_ALIAS_LENGTH);
+			oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+			break;
+		}
 
-int yaffs_DeleteFile(yaffs_Object *in)
-{
-	int retVal = YAFFS_OK;
-	int deleted = in->deleted;
+		/* process any xattrib modifications */
+		if(xmod)
+			yaffs_ApplyXMod(in, (char *)buffer, xmod);
 
-	yaffs_ResizeFile(in, 0);
 
-	if (in->nDataChunks > 0) {
-		/* Use soft deletion if there is data in the file.
-		 * That won't be the case if it has been resized to zero.
-		 */
-		if (!in->unlinked)
-			retVal = yaffs_UnlinkFileIfNeeded(in);
+		/* Tags */
+		yaffs_InitialiseTags(&newTags);
+		in->serial++;
+		newTags.chunkId = 0;
+		newTags.objectId = in->objectId;
+		newTags.serialNumber = in->serial;
 
-		if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
-			in->deleted = 1;
-			deleted = 1;
-			in->myDev->nDeletedFiles++;
-			yaffs_SoftDeleteFile(in);
-		}
-		return deleted ? YAFFS_OK : YAFFS_FAIL;
-	} else {
-		/* The file has no data chunks so we toss it immediately */
-		yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
-		in->variant.fileVariant.top = NULL;
-		yaffs_DoGenericObjectDeletion(in);
+		/* Add extra info for file header */
 
-		return YAFFS_OK;
-	}
-}
+		newTags.extraHeaderInfoAvailable = 1;
+		newTags.extraParentObjectId = oh->parentObjectId;
+		newTags.extraFileLength = oh->fileSize;
+		newTags.extraIsShrinkHeader = oh->isShrink;
+		newTags.extraEquivalentObjectId = oh->equivalentObjectId;
+		newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
+		newTags.extraObjectType = in->variantType;
 
-static int yaffs_DeleteDirectory(yaffs_Object *in)
-{
-	/* First check that the directory is empty. */
-	if (ylist_empty(&in->variant.directoryVariant.children))
-		return yaffs_DoGenericObjectDeletion(in);
+		yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
 
-	return YAFFS_FAIL;
+		/* Create new chunk in NAND */
+		newChunkId =
+		    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+						      (prevChunkId > 0) ? 1 : 0);
 
-}
+		if (newChunkId >= 0) {
 
-static int yaffs_DeleteSymLink(yaffs_Object *in)
-{
-	YFREE(in->variant.symLinkVariant.alias);
+			in->hdrChunk = newChunkId;
 
-	return yaffs_DoGenericObjectDeletion(in);
-}
+			if (prevChunkId > 0) {
+				yaffs_DeleteChunk(dev, prevChunkId, 1,
+						  __LINE__);
+			}
 
-static int yaffs_DeleteHardLink(yaffs_Object *in)
-{
-	/* remove this hardlink from the list assocaited with the equivalent
-	 * object
-	 */
-	ylist_del_init(&in->hardLinks);
-	return yaffs_DoGenericObjectDeletion(in);
-}
+			if (!yaffs_ObjectHasCachedWriteData(in))
+				in->dirty = 0;
+
+			/* If this was a shrink, then mark the block that the chunk lives on */
+			if (isShrink) {
+				bi = yaffs_GetBlockInfo(in->myDev,
+					newChunkId / in->myDev->param.nChunksPerBlock);
+				bi->hasShrinkHeader = 1;
+			}
+
+		}
+
+		retVal = newChunkId;
 
-int yaffs_DeleteObject(yaffs_Object *obj)
-{
-int retVal = -1;
-	switch (obj->variantType) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		retVal = yaffs_DeleteFile(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		return yaffs_DeleteDirectory(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		retVal = yaffs_DeleteSymLink(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		retVal = yaffs_DeleteHardLink(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-		retVal = yaffs_DoGenericObjectDeletion(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_UNKNOWN:
-		retVal = 0;
-		break;		/* should not happen. */
 	}
 
+	if (buffer)
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
 	return retVal;
 }
 
-static int yaffs_UnlinkWorker(yaffs_Object *obj)
+/*------------------------ Short Operations Cache ----------------------------------------
+ *   In many situations where there is no high level buffering (eg WinCE) a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance benefit
+ *   with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering aand the short op cache provides write
+ *   buffering.
+ *
+ *   There are a limited number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
+
+static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
 {
+	yaffs_Device *dev = obj->myDev;
+	int i;
+	yaffs_ChunkCache *cache;
+	int nCaches = obj->myDev->param.nShortOpCaches;
 
-	int immediateDeletion = 0;
+	for (i = 0; i < nCaches; i++) {
+		cache = &dev->srCache[i];
+		if (cache->object == obj &&
+		    cache->dirty)
+			return 1;
+	}
 
-#ifdef __KERNEL__
-	if (!obj->myInode)
-		immediateDeletion = 1;
-#else
-	if (obj->inUse <= 0)
-		immediateDeletion = 1;
-#endif
+	return 0;
+}
 
-	if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-		return yaffs_DeleteHardLink(obj);
-	} else if (!ylist_empty(&obj->hardLinks)) {
-		/* Curve ball: We're unlinking an object that has a hardlink.
-		 *
-		 * This problem arises because we are not strictly following
-		 * The Linux link/inode model.
-		 *
-		 * We can't really delete the object.
-		 * Instead, we do the following:
-		 * - Select a hardlink.
-		 * - Unhook it from the hard links
-		 * - Unhook it from its parent directory (so that the rename can work)
-		 * - Rename the object to the hardlink's name.
-		 * - Delete the hardlink
-		 */
 
-		yaffs_Object *hl;
-		int retVal;
-		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	int lowest = -99;	/* Stop compiler whining. */
+	int i;
+	yaffs_ChunkCache *cache;
+	int chunkWritten = 0;
+	int nCaches = obj->myDev->param.nShortOpCaches;
 
-		hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
+	if (nCaches > 0) {
+		do {
+			cache = NULL;
 
-		ylist_del_init(&hl->hardLinks);
-		ylist_del_init(&hl->siblings);
+			/* Find the dirty cache for this object with the lowest chunk id. */
+			for (i = 0; i < nCaches; i++) {
+				if (dev->srCache[i].object == obj &&
+				    dev->srCache[i].dirty) {
+					if (!cache
+					    || dev->srCache[i].chunkId <
+					    lowest) {
+						cache = &dev->srCache[i];
+						lowest = cache->chunkId;
+					}
+				}
+			}
 
-		yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+			if (cache && !cache->locked) {
+				/* Write it out and free it up */
 
-		retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
+				chunkWritten =
+				    yaffs_WriteChunkDataToObject(cache->object,
+								 cache->chunkId,
+								 cache->data,
+								 cache->nBytes,
+								 1);
+				cache->dirty = 0;
+				cache->object = NULL;
+			}
 
-		if (retVal == YAFFS_OK)
-			retVal = yaffs_DoGenericObjectDeletion(hl);
+		} while (cache && chunkWritten > 0);
 
-		return retVal;
+		if (cache) {
+			/* Hoosterman, disk full while writing cache out. */
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
 
-	} else if (immediateDeletion) {
-		switch (obj->variantType) {
-		case YAFFS_OBJECT_TYPE_FILE:
-			return yaffs_DeleteFile(obj);
-			break;
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			return yaffs_DeleteDirectory(obj);
-			break;
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-			return yaffs_DeleteSymLink(obj);
-			break;
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-			return yaffs_DoGenericObjectDeletion(obj);
-			break;
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-		default:
-			return YAFFS_FAIL;
 		}
-	} else
-		return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
-					   _Y("unlinked"), 0, 0);
+	}
+
 }
 
+/*yaffs_FlushEntireDeviceCache(dev)
+ *
+ *
+ */
 
-static int yaffs_UnlinkObject(yaffs_Object *obj)
+void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
 {
+	yaffs_Object *obj;
+	int nCaches = dev->param.nShortOpCaches;
+	int i;
 
-	if (obj && obj->unlinkAllowed)
-		return yaffs_UnlinkWorker(obj);
+	/* Find a dirty object in the cache and flush it...
+	 * until there are no further dirty objects.
+	 */
+	do {
+		obj = NULL;
+		for (i = 0; i < nCaches && !obj; i++) {
+			if (dev->srCache[i].object &&
+			    dev->srCache[i].dirty)
+				obj = dev->srCache[i].object;
 
-	return YAFFS_FAIL;
+		}
+		if (obj)
+			yaffs_FlushFilesChunkCache(obj);
+
+	} while (obj);
 
 }
-int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
+
+
+/* Grab us a cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
 {
-	yaffs_Object *obj;
+	int i;
 
-	obj = yaffs_FindObjectByName(dir, name);
-	return yaffs_UnlinkObject(obj);
-}
+	if (dev->param.nShortOpCaches > 0) {
+		for (i = 0; i < dev->param.nShortOpCaches; i++) {
+			if (!dev->srCache[i].object)
+				return &dev->srCache[i];
+		}
+	}
 
-/*----------------------- Initialisation Scanning ---------------------- */
+	return NULL;
+}
 
-static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
-				int backwardScanning)
+static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
 {
-	yaffs_Object *obj;
+	yaffs_ChunkCache *cache;
+	yaffs_Object *theObj;
+	int usage;
+	int i;
+	int pushout;
 
-	if (!backwardScanning) {
-		/* Handle YAFFS1 forward scanning case
-		 * For YAFFS1 we always do the deletion
-		 */
+	if (dev->param.nShortOpCaches > 0) {
+		/* Try find a non-dirty one... */
 
-	} else {
-		/* Handle YAFFS2 case (backward scanning)
-		 * If the shadowed object exists then ignore.
-		 */
-		if (yaffs_FindObjectByNumber(dev, objId))
-			return;
-	}
+		cache = yaffs_GrabChunkCacheWorker(dev);
 
-	/* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
-	 * We put it in unlinked dir to be cleaned up after the scanning
-	 */
-	obj =
-	    yaffs_FindOrCreateObjectByNumber(dev, objId,
-					     YAFFS_OBJECT_TYPE_FILE);
-	if (!obj)
-		return;
-	yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
-	obj->variant.fileVariant.shrinkSize = 0;
-	obj->valid = 1;		/* So that we don't read any other info for this file */
+		if (!cache) {
+			/* They were all dirty, find the last recently used object and flush
+			 * its cache, then  find again.
+			 * NB what's here is not very accurate, we actually flush the object
+			 * the last recently used page.
+			 */
 
-}
+			/* With locking we can't assume we can use entry zero */
 
-typedef struct {
-	int seq;
-	int block;
-} yaffs_BlockIndex;
+			theObj = NULL;
+			usage = -1;
+			cache = NULL;
+			pushout = -1;
 
+			for (i = 0; i < dev->param.nShortOpCaches; i++) {
+				if (dev->srCache[i].object &&
+				    !dev->srCache[i].locked &&
+				    (dev->srCache[i].lastUse < usage || !cache)) {
+					usage = dev->srCache[i].lastUse;
+					theObj = dev->srCache[i].object;
+					cache = &dev->srCache[i];
+					pushout = i;
+				}
+			}
 
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
-{
-	yaffs_Object *hl;
-	yaffs_Object *in;
+			if (!cache || cache->dirty) {
+				/* Flush and try again */
+				yaffs_FlushFilesChunkCache(theObj);
+				cache = yaffs_GrabChunkCacheWorker(dev);
+			}
 
-	while (hardList) {
-		hl = hardList;
-		hardList = (yaffs_Object *) (hardList->hardLinks.next);
+		}
+		return cache;
+	} else
+		return NULL;
 
-		in = yaffs_FindObjectByNumber(dev,
-					      hl->variant.hardLinkVariant.
-					      equivalentObjectId);
+}
 
-		if (in) {
-			/* Add the hardlink pointers */
-			hl->variant.hardLinkVariant.equivalentObject = in;
-			ylist_add(&hl->hardLinks, &in->hardLinks);
-		} else {
-			/* Todo Need to report/handle this better.
-			 * Got a problem... hardlink to a non-existant object
-			 */
-			hl->variant.hardLinkVariant.equivalentObject = NULL;
-			YINIT_LIST_HEAD(&hl->hardLinks);
+/* Find a cached chunk */
+static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
+					      int chunkId)
+{
+	yaffs_Device *dev = obj->myDev;
+	int i;
+	if (dev->param.nShortOpCaches > 0) {
+		for (i = 0; i < dev->param.nShortOpCaches; i++) {
+			if (dev->srCache[i].object == obj &&
+			    dev->srCache[i].chunkId == chunkId) {
+				dev->cacheHits++;
 
+				return &dev->srCache[i];
+			}
 		}
 	}
+	return NULL;
 }
 
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
+				int isAWrite)
+{
+
+	if (dev->param.nShortOpCaches > 0) {
+		if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
+			/* Reset the cache usages */
+			int i;
+			for (i = 1; i < dev->param.nShortOpCaches; i++)
+				dev->srCache[i].lastUse = 0;
 
+			dev->srLastUse = 0;
+		}
 
+		dev->srLastUse++;
 
+		cache->lastUse = dev->srLastUse;
 
-static int ybicmp(const void *a, const void *b)
-{
-	register int aseq = ((yaffs_BlockIndex *)a)->seq;
-	register int bseq = ((yaffs_BlockIndex *)b)->seq;
-	register int ablock = ((yaffs_BlockIndex *)a)->block;
-	register int bblock = ((yaffs_BlockIndex *)b)->block;
-	if (aseq == bseq)
-		return ablock - bblock;
-	else
-		return aseq - bseq;
+		if (isAWrite)
+			cache->dirty = 1;
+	}
 }
 
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
+{
+	if (object->myDev->param.nShortOpCaches > 0) {
+		yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
 
-struct yaffs_ShadowFixerStruct {
-	int objectId;
-	int shadowedId;
-	struct yaffs_ShadowFixerStruct *next;
-};
-
+		if (cache)
+			cache->object = NULL;
+	}
+}
 
-static void yaffs_StripDeletedObjects(yaffs_Device *dev)
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
 {
-	/*
-	*  Sort out state of unlinked and deleted objects after scanning.
-	*/
-	struct ylist_head *i;
-	struct ylist_head *n;
-	yaffs_Object *l;
+	int i;
+	yaffs_Device *dev = in->myDev;
 
-	/* Soft delete all the unlinked files */
-	ylist_for_each_safe(i, n,
-		&dev->unlinkedDir->variant.directoryVariant.children) {
-		if (i) {
-			l = ylist_entry(i, yaffs_Object, siblings);
-			yaffs_DeleteObject(l);
+	if (dev->param.nShortOpCaches > 0) {
+		/* Invalidate it. */
+		for (i = 0; i < dev->param.nShortOpCaches; i++) {
+			if (dev->srCache[i].object == in)
+				dev->srCache[i].object = NULL;
 		}
 	}
+}
 
-	ylist_for_each_safe(i, n,
-		&dev->deletedDir->variant.directoryVariant.children) {
-		if (i) {
-			l = ylist_entry(i, yaffs_Object, siblings);
-			yaffs_DeleteObject(l);
-		}
-	}
 
-}
+/*--------------------- File read/write ------------------------
+ * Read and write have very similar structures.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
 
-static int yaffs_Scan(yaffs_Device *dev)
+int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
+			int nBytes)
 {
-	yaffs_ExtendedTags tags;
-	int blk;
-	int blockIterator;
-	int startIterator;
-	int endIterator;
-	int result;
 
 	int chunk;
-	int c;
-	int deleted;
-	yaffs_BlockState state;
-	yaffs_Object *hardList = NULL;
-	yaffs_BlockInfo *bi;
-	__u32 sequenceNumber;
-	yaffs_ObjectHeader *oh;
-	yaffs_Object *in;
-	yaffs_Object *parent;
-
-	int alloc_failed = 0;
+	__u32 start;
+	int nToCopy;
+	int n = nBytes;
+	int nDone = 0;
+	yaffs_ChunkCache *cache;
 
-	struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
+	yaffs_Device *dev;
 
+	dev = in->myDev;
 
-	__u8 *chunkData;
+	while (n > 0) {
+		/* chunk = offset / dev->nDataBytesPerChunk + 1; */
+		/* start = offset % dev->nDataBytesPerChunk; */
+		yaffs_AddrToChunk(dev, offset, &chunk, &start);
+		chunk++;
 
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+		if ((start + n) < dev->nDataBytesPerChunk)
+			nToCopy = n;
+		else
+			nToCopy = dev->nDataBytesPerChunk - start;
 
+		cache = yaffs_FindChunkCache(in, chunk);
 
-	T(YAFFS_TRACE_SCAN,
-	  (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
-	   dev->internalStartBlock, dev->internalEndBlock));
-
-	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
-
-	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
-	/* Scan all the blocks to determine their state */
-	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
-		bi = yaffs_GetBlockInfo(dev, blk);
-		yaffs_ClearChunkBits(dev, blk);
-		bi->pagesInUse = 0;
-		bi->softDeletions = 0;
+		/* If the chunk is already in the cache or it is less than a whole chunk
+		 * or we're using inband tags then use the cache (if there is caching)
+		 * else bypass the cache.
+		 */
+		if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
+			if (dev->param.nShortOpCaches > 0) {
 
-		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+				/* If we can't find the data in the cache, then load it up. */
 
-		bi->blockState = state;
-		bi->sequenceNumber = sequenceNumber;
+				if (!cache) {
+					cache = yaffs_GrabChunkCache(in->myDev);
+					cache->object = in;
+					cache->chunkId = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_ReadChunkDataFromObject(in, chunk,
+								      cache->
+								      data);
+					cache->nBytes = 0;
+				}
 
-		if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
-			bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+				yaffs_UseChunkCache(dev, cache, 0);
 
-		T(YAFFS_TRACE_SCAN_DEBUG,
-		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
-		   state, sequenceNumber));
+				cache->locked = 1;
 
-		if (state == YAFFS_BLOCK_STATE_DEAD) {
-			T(YAFFS_TRACE_BAD_BLOCKS,
-			  (TSTR("block %d is bad" TENDSTR), blk));
-		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
-			T(YAFFS_TRACE_SCAN_DEBUG,
-			  (TSTR("Block empty " TENDSTR)));
-			dev->nErasedBlocks++;
-			dev->nFreeChunks += dev->nChunksPerBlock;
-		}
-	}
 
-	startIterator = dev->internalStartBlock;
-	endIterator = dev->internalEndBlock;
+				memcpy(buffer, &cache->data[start], nToCopy);
 
-	/* For each block.... */
-	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
-	     blockIterator++) {
+				cache->locked = 0;
+			} else {
+				/* Read into the local buffer then copy..*/
 
-		YYIELD();
+				__u8 *localBuffer =
+				    yaffs_GetTempBuffer(dev, __LINE__);
+				yaffs_ReadChunkDataFromObject(in, chunk,
+							      localBuffer);
 
-		YYIELD();
+				memcpy(buffer, &localBuffer[start], nToCopy);
 
-		blk = blockIterator;
 
-		bi = yaffs_GetBlockInfo(dev, blk);
-		state = bi->blockState;
+				yaffs_ReleaseTempBuffer(dev, localBuffer,
+							__LINE__);
+			}
 
-		deleted = 0;
+		} else {
 
-		/* For each chunk in each block that needs scanning....*/
-		for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
-		     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
-			/* Read the tags and decide what to do */
-			chunk = blk * dev->nChunksPerBlock + c;
+			/* A full chunk. Read directly into the supplied buffer. */
+			yaffs_ReadChunkDataFromObject(in, chunk, buffer);
 
-			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
-							&tags);
+		}
 
-			/* Let's have a good look at this chunk... */
+		n -= nToCopy;
+		offset += nToCopy;
+		buffer += nToCopy;
+		nDone += nToCopy;
 
-			if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
-				/* YAFFS1 only...
-				 * A deleted chunk
-				 */
-				deleted++;
-				dev->nFreeChunks++;
-				/*T((" %d %d deleted\n",blk,c)); */
-			} else if (!tags.chunkUsed) {
-				/* An unassigned chunk in the block
-				 * This means that either the block is empty or
-				 * this is the one being allocated from
-				 */
+	}
 
-				if (c == 0) {
-					/* We're looking at the first chunk in the block so the block is unused */
-					state = YAFFS_BLOCK_STATE_EMPTY;
-					dev->nErasedBlocks++;
-				} else {
-					/* this is the block being allocated from */
-					T(YAFFS_TRACE_SCAN,
-					  (TSTR
-					   (" Allocating from %d %d" TENDSTR),
-					   blk, c));
-					state = YAFFS_BLOCK_STATE_ALLOCATING;
-					dev->allocationBlock = blk;
-					dev->allocationPage = c;
-					dev->allocationBlockFinder = blk;
-					/* Set it to here to encourage the allocator to go forth from here. */
+	return nDone;
+}
 
-				}
+int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+			int nBytes, int writeThrough)
+{
 
-				dev->nFreeChunks += (dev->nChunksPerBlock - c);
-			} else if (tags.chunkId > 0) {
-				/* chunkId > 0 so it is a data chunk... */
-				unsigned int endpos;
-
-				yaffs_SetChunkBit(dev, blk, c);
-				bi->pagesInUse++;
-
-				in = yaffs_FindOrCreateObjectByNumber(dev,
-								      tags.
-								      objectId,
-								      YAFFS_OBJECT_TYPE_FILE);
-				/* PutChunkIntoFile checks for a clash (two data chunks with
-				 * the same chunkId).
-				 */
+	int chunk;
+	__u32 start;
+	int nToCopy;
+	int n = nBytes;
+	int nDone = 0;
+	int nToWriteBack;
+	int startOfWrite = offset;
+	int chunkWritten = 0;
+	__u32 nBytesRead;
+	__u32 chunkStart;
 
-				if (!in)
-					alloc_failed = 1;
+	yaffs_Device *dev;
 
-				if (in) {
-					if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
-						alloc_failed = 1;
-				}
+	dev = in->myDev;
 
-				endpos =
-				    (tags.chunkId - 1) * dev->nDataBytesPerChunk +
-				    tags.byteCount;
-				if (in &&
-				    in->variantType == YAFFS_OBJECT_TYPE_FILE
-				    && in->variant.fileVariant.scannedFileSize <
-				    endpos) {
-					in->variant.fileVariant.
-					    scannedFileSize = endpos;
-					if (!dev->useHeaderFileSize) {
-						in->variant.fileVariant.
-						    fileSize =
-						    in->variant.fileVariant.
-						    scannedFileSize;
-					}
+	while (n > 0 && chunkWritten >= 0) {
+		yaffs_AddrToChunk(dev, offset, &chunk, &start);
 
-				}
-				/* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
-			} else {
-				/* chunkId == 0, so it is an ObjectHeader.
-				 * Thus, we read in the object header and make the object
-				 */
-				yaffs_SetChunkBit(dev, blk, c);
-				bi->pagesInUse++;
+		if (chunk * dev->nDataBytesPerChunk + start != offset ||
+				start >= dev->nDataBytesPerChunk) {
+			T(YAFFS_TRACE_ERROR, (
+			   TSTR("AddrToChunk of offset %d gives chunk %d start %d"
+			   TENDSTR),
+			   (int)offset, chunk, start));
+		}
+		chunk++; /* File pos to chunk in file offset */
 
-				result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
-								chunkData,
-								NULL);
-
-				oh = (yaffs_ObjectHeader *) chunkData;
-
-				in = yaffs_FindObjectByNumber(dev,
-							      tags.objectId);
-				if (in && in->variantType != oh->type) {
-					/* This should not happen, but somehow
-					 * Wev'e ended up with an objectId that has been reused but not yet
-					 * deleted, and worse still it has changed type. Delete the old object.
-					 */
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
 
-					yaffs_DeleteObject(in);
+		if ((start + n) < dev->nDataBytesPerChunk) {
+			nToCopy = n;
 
-					in = 0;
-				}
+			/* Now folks, to calculate how many bytes to write back....
+			 * If we're overwriting and not writing to then end of file then
+			 * we need to write back as much as was there before.
+			 */
 
-				in = yaffs_FindOrCreateObjectByNumber(dev,
-								      tags.
-								      objectId,
-								      oh->type);
-
-				if (!in)
-					alloc_failed = 1;
-
-				if (in && oh->shadowsObject > 0) {
-
-					struct yaffs_ShadowFixerStruct *fixer;
-					fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
-					if (fixer) {
-						fixer->next = shadowFixerList;
-						shadowFixerList = fixer;
-						fixer->objectId = tags.objectId;
-						fixer->shadowedId = oh->shadowsObject;
-					}
+			chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
 
-				}
+			if (chunkStart > in->variant.fileVariant.fileSize)
+				nBytesRead = 0; /* Past end of file */
+			else
+				nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
 
-				if (in && in->valid) {
-					/* We have already filled this one. We have a duplicate and need to resolve it. */
+			if (nBytesRead > dev->nDataBytesPerChunk)
+				nBytesRead = dev->nDataBytesPerChunk;
 
-					unsigned existingSerial = in->serial;
-					unsigned newSerial = tags.serialNumber;
+			nToWriteBack =
+			    (nBytesRead >
+			     (start + n)) ? nBytesRead : (start + n);
 
-					if (((existingSerial + 1) & 3) == newSerial) {
-						/* Use new one - destroy the exisiting one */
-						yaffs_DeleteChunk(dev,
-								  in->hdrChunk,
-								  1, __LINE__);
-						in->valid = 0;
-					} else {
-						/* Use existing - destroy this one. */
-						yaffs_DeleteChunk(dev, chunk, 1,
-								  __LINE__);
-					}
-				}
+			if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
+				YBUG();
 
-				if (in && !in->valid &&
-				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
-				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
-					/* We only load some info, don't fiddle with directory structure */
-					in->valid = 1;
-					in->variantType = oh->type;
+		} else {
+			nToCopy = dev->nDataBytesPerChunk - start;
+			nToWriteBack = dev->nDataBytesPerChunk;
+		}
 
-					in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-					in->win_atime[0] = oh->win_atime[0];
-					in->win_ctime[0] = oh->win_ctime[0];
-					in->win_mtime[0] = oh->win_mtime[0];
-					in->win_atime[1] = oh->win_atime[1];
-					in->win_ctime[1] = oh->win_ctime[1];
-					in->win_mtime[1] = oh->win_mtime[1];
-#else
-					in->yst_uid = oh->yst_uid;
-					in->yst_gid = oh->yst_gid;
-					in->yst_atime = oh->yst_atime;
-					in->yst_mtime = oh->yst_mtime;
-					in->yst_ctime = oh->yst_ctime;
-					in->yst_rdev = oh->yst_rdev;
-#endif
-					in->hdrChunk = chunk;
-					in->serial = tags.serialNumber;
+		if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
+			/* An incomplete start or end chunk (or maybe both start and end chunk),
+			 * or we're using inband tags, so we want to use the cache buffers.
+			 */
+			if (dev->param.nShortOpCaches > 0) {
+				yaffs_ChunkCache *cache;
+				/* If we can't find the data in the cache, then load the cache */
+				cache = yaffs_FindChunkCache(in, chunk);
 
-				} else if (in && !in->valid) {
-					/* we need to load this info */
+				if (!cache
+				    && yaffs_CheckSpaceForAllocation(dev, 1)) {
+					cache = yaffs_GrabChunkCache(dev);
+					cache->object = in;
+					cache->chunkId = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_ReadChunkDataFromObject(in, chunk,
+								      cache->data);
+				} else if (cache &&
+					!cache->dirty &&
+					!yaffs_CheckSpaceForAllocation(dev, 1)) {
+					/* Drop the cache if it was a read cache item and
+					 * no space check has been made for it.
+					 */
+					 cache = NULL;
+				}
 
-					in->valid = 1;
-					in->variantType = oh->type;
+				if (cache) {
+					yaffs_UseChunkCache(dev, cache, 1);
+					cache->locked = 1;
 
-					in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-					in->win_atime[0] = oh->win_atime[0];
-					in->win_ctime[0] = oh->win_ctime[0];
-					in->win_mtime[0] = oh->win_mtime[0];
-					in->win_atime[1] = oh->win_atime[1];
-					in->win_ctime[1] = oh->win_ctime[1];
-					in->win_mtime[1] = oh->win_mtime[1];
-#else
-					in->yst_uid = oh->yst_uid;
-					in->yst_gid = oh->yst_gid;
-					in->yst_atime = oh->yst_atime;
-					in->yst_mtime = oh->yst_mtime;
-					in->yst_ctime = oh->yst_ctime;
-					in->yst_rdev = oh->yst_rdev;
-#endif
-					in->hdrChunk = chunk;
-					in->serial = tags.serialNumber;
 
-					yaffs_SetObjectName(in, oh->name);
-					in->dirty = 0;
+					memcpy(&cache->data[start], buffer,
+					       nToCopy);
 
-					/* directory stuff...
-					 * hook up to parent
-					 */
 
-					parent =
-					    yaffs_FindOrCreateObjectByNumber
-					    (dev, oh->parentObjectId,
-					     YAFFS_OBJECT_TYPE_DIRECTORY);
-					if (!parent)
-						alloc_failed = 1;
-					if (parent && parent->variantType ==
-					    YAFFS_OBJECT_TYPE_UNKNOWN) {
-						/* Set up as a directory */
-						parent->variantType =
-							YAFFS_OBJECT_TYPE_DIRECTORY;
-						YINIT_LIST_HEAD(&parent->variant.
-								directoryVariant.
-								children);
-					} else if (!parent || parent->variantType !=
-						   YAFFS_OBJECT_TYPE_DIRECTORY) {
-						/* Hoosterman, another problem....
-						 * We're trying to use a non-directory as a directory
-						 */
+					cache->locked = 0;
+					cache->nBytes = nToWriteBack;
 
-						T(YAFFS_TRACE_ERROR,
-						  (TSTR
-						   ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
-						    TENDSTR)));
-						parent = dev->lostNFoundDir;
+					if (writeThrough) {
+						chunkWritten =
+						    yaffs_WriteChunkDataToObject
+						    (cache->object,
+						     cache->chunkId,
+						     cache->data, cache->nBytes,
+						     1);
+						cache->dirty = 0;
 					}
 
-					yaffs_AddObjectToDirectory(parent, in);
+				} else {
+					chunkWritten = -1;	/* fail the write */
+				}
+			} else {
+				/* An incomplete start or end chunk (or maybe both start and end chunk)
+				 * Read into the local buffer then copy, then copy over and write back.
+				 */
 
-					if (0 && (parent == dev->deletedDir ||
-						  parent == dev->unlinkedDir)) {
-						in->deleted = 1;	/* If it is unlinked at start up then it wants deleting */
-						dev->nDeletedFiles++;
-					}
-					/* Note re hardlinks.
-					 * Since we might scan a hardlink before its equivalent object is scanned
-					 * we put them all in a list.
-					 * After scanning is complete, we should have all the objects, so we run through this
-					 * list and fix up all the chains.
-					 */
+				__u8 *localBuffer =
+				    yaffs_GetTempBuffer(dev, __LINE__);
 
-					switch (in->variantType) {
-					case YAFFS_OBJECT_TYPE_UNKNOWN:
-						/* Todo got a problem */
-						break;
-					case YAFFS_OBJECT_TYPE_FILE:
-						if (dev->useHeaderFileSize)
-
-							in->variant.fileVariant.
-							    fileSize =
-							    oh->fileSize;
-
-						break;
-					case YAFFS_OBJECT_TYPE_HARDLINK:
-						in->variant.hardLinkVariant.
-							equivalentObjectId =
-							oh->equivalentObjectId;
-						in->hardLinks.next =
-							(struct ylist_head *)
-							hardList;
-						hardList = in;
-						break;
-					case YAFFS_OBJECT_TYPE_DIRECTORY:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SPECIAL:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SYMLINK:
-						in->variant.symLinkVariant.alias =
-						    yaffs_CloneString(oh->alias);
-						if (!in->variant.symLinkVariant.alias)
-							alloc_failed = 1;
-						break;
-					}
+				yaffs_ReadChunkDataFromObject(in, chunk,
+							      localBuffer);
 
-/*
-					if (parent == dev->deletedDir) {
-						yaffs_DestroyObject(in);
-						bi->hasShrinkHeader = 1;
-					}
-*/
-				}
-			}
-		}
 
-		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-			/* If we got this far while scanning, then the block is fully allocated.*/
-			state = YAFFS_BLOCK_STATE_FULL;
-		}
 
-		bi->blockState = state;
+				memcpy(&localBuffer[start], buffer, nToCopy);
 
-		/* Now let's see if it was dirty */
-		if (bi->pagesInUse == 0 &&
-		    !bi->hasShrinkHeader &&
-		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
-			yaffs_BlockBecameDirty(dev, blk);
-		}
+				chunkWritten =
+				    yaffs_WriteChunkDataToObject(in, chunk,
+								 localBuffer,
+								 nToWriteBack,
+								 0);
 
-	}
+				yaffs_ReleaseTempBuffer(dev, localBuffer,
+							__LINE__);
 
+			}
 
-	/* Ok, we've done all the scanning.
-	 * Fix up the hard link chains.
-	 * We should now have scanned all the objects, now it's time to add these
-	 * hardlinks.
-	 */
+		} else {
+			/* A full chunk. Write directly from the supplied buffer. */
 
-	yaffs_HardlinkFixup(dev, hardList);
 
-	/* Fix up any shadowed objects */
-	{
-		struct yaffs_ShadowFixerStruct *fixer;
-		yaffs_Object *obj;
-
-		while (shadowFixerList) {
-			fixer = shadowFixerList;
-			shadowFixerList = fixer->next;
-			/* Complete the rename transaction by deleting the shadowed object
-			 * then setting the object header to unshadowed.
-			 */
-			obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
-			if (obj)
-				yaffs_DeleteObject(obj);
 
-			obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
+			chunkWritten =
+			    yaffs_WriteChunkDataToObject(in, chunk, buffer,
+							 dev->nDataBytesPerChunk,
+							 0);
 
-			if (obj)
-				yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
+			/* Since we've overwritten the cached data, we better invalidate it. */
+			yaffs_InvalidateChunkCache(in, chunk);
+		}
 
-			YFREE(fixer);
+		if (chunkWritten >= 0) {
+			n -= nToCopy;
+			offset += nToCopy;
+			buffer += nToCopy;
+			nDone += nToCopy;
 		}
-	}
 
-	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+	}
 
-	if (alloc_failed)
-		return YAFFS_FAIL;
+	/* Update file object */
 
-	T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
+	if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
+		in->variant.fileVariant.fileSize = (startOfWrite + nDone);
 
+	in->dirty = 1;
 
-	return YAFFS_OK;
+	return nDone;
 }
 
-static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
+int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+			int nBytes, int writeThrough)
 {
-	__u8 *chunkData;
-	yaffs_ObjectHeader *oh;
-	yaffs_Device *dev;
-	yaffs_ExtendedTags tags;
-	int result;
-	int alloc_failed = 0;
+	yaffs2_HandleHole(in,offset);
+	return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
+}
 
-	if (!in)
-		return;
 
-	dev = in->myDev;
 
-#if 0
-	T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
-		in->objectId,
-		in->lazyLoaded ? "not yet" : "already"));
-#endif
+/* ---------------------- File resizing stuff ------------------ */
 
-	if (in->lazyLoaded && in->hdrChunk > 0) {
-		in->lazyLoaded = 0;
-		chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
+{
 
-		result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
-		oh = (yaffs_ObjectHeader *) chunkData;
+	yaffs_Device *dev = in->myDev;
+	int oldFileSize = in->variant.fileVariant.fileSize;
 
-		in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-		in->win_atime[0] = oh->win_atime[0];
-		in->win_ctime[0] = oh->win_ctime[0];
-		in->win_mtime[0] = oh->win_mtime[0];
-		in->win_atime[1] = oh->win_atime[1];
-		in->win_ctime[1] = oh->win_ctime[1];
-		in->win_mtime[1] = oh->win_mtime[1];
-#else
-		in->yst_uid = oh->yst_uid;
-		in->yst_gid = oh->yst_gid;
-		in->yst_atime = oh->yst_atime;
-		in->yst_mtime = oh->yst_mtime;
-		in->yst_ctime = oh->yst_ctime;
-		in->yst_rdev = oh->yst_rdev;
+	int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
 
-#endif
-		yaffs_SetObjectName(in, oh->name);
+	int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
+	    dev->nDataBytesPerChunk;
+	int i;
+	int chunkId;
 
-		if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
-			in->variant.symLinkVariant.alias =
-						    yaffs_CloneString(oh->alias);
-			if (!in->variant.symLinkVariant.alias)
-				alloc_failed = 1; /* Not returned to caller */
-		}
+	/* Delete backwards so that we don't end up with holes if
+	 * power is lost part-way through the operation.
+	 */
+	for (i = lastDel; i >= startDel; i--) {
+		/* NB this could be optimised somewhat,
+		 * eg. could retrieve the tags and write them without
+		 * using yaffs_DeleteChunk
+		 */
 
-		yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+		chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
+		if (chunkId > 0) {
+			if (chunkId <
+			    (dev->internalStartBlock * dev->param.nChunksPerBlock)
+			    || chunkId >=
+			    ((dev->internalEndBlock +
+			      1) * dev->param.nChunksPerBlock)) {
+				T(YAFFS_TRACE_ALWAYS,
+				  (TSTR("Found daft chunkId %d for %d" TENDSTR),
+				   chunkId, i));
+			} else {
+				in->nDataChunks--;
+				yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
+			}
+		}
 	}
+
 }
 
-static int yaffs_ScanBackwards(yaffs_Device *dev)
+
+void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
 {
-	yaffs_ExtendedTags tags;
-	int blk;
-	int blockIterator;
-	int startIterator;
-	int endIterator;
-	int nBlocksToScan = 0;
+	int newFullChunks;
+	__u32 newSizeOfPartialChunk;
+	yaffs_Device *dev = obj->myDev;
 
-	int chunk;
-	int result;
-	int c;
-	int deleted;
-	yaffs_BlockState state;
-	yaffs_Object *hardList = NULL;
-	yaffs_BlockInfo *bi;
-	__u32 sequenceNumber;
-	yaffs_ObjectHeader *oh;
-	yaffs_Object *in;
-	yaffs_Object *parent;
-	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-	int itsUnlinked;
-	__u8 *chunkData;
+	yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
 
-	int fileSize;
-	int isShrink;
-	int foundChunksInBlock;
-	int equivalentObjectId;
-	int alloc_failed = 0;
+	yaffs_PruneResizedChunks(obj, newSize);
 
+	if (newSizeOfPartialChunk != 0) {
+		int lastChunk = 1 + newFullChunks;
+		__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
 
-	yaffs_BlockIndex *blockIndex = NULL;
-	int altBlockIndex = 0;
+		/* Got to read and rewrite the last chunk with its new size and zero pad */
+		yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
+		memset(localBuffer + newSizeOfPartialChunk, 0,
+			dev->nDataBytesPerChunk - newSizeOfPartialChunk);
 
-	if (!dev->isYaffs2) {
-		T(YAFFS_TRACE_SCAN,
-		  (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
-		return YAFFS_FAIL;
+		yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
+					     newSizeOfPartialChunk, 1);
+
+		yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
 	}
 
-	T(YAFFS_TRACE_SCAN,
-	  (TSTR
-	   ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
-	    TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
+	obj->variant.fileVariant.fileSize = newSize;
+
+	yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
+}
 
 
-	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
+{
+	yaffs_Device *dev = in->myDev;
+	int oldFileSize = in->variant.fileVariant.fileSize;
 
-	blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+	yaffs_FlushFilesChunkCache(in);
+	yaffs_InvalidateWholeChunkCache(in);
 
-	if (!blockIndex) {
-		blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
-		altBlockIndex = 1;
-	}
+	yaffs_CheckGarbageCollection(dev,0);
 
-	if (!blockIndex) {
-		T(YAFFS_TRACE_SCAN,
-		  (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
 		return YAFFS_FAIL;
-	}
 
-	dev->blocksInCheckpoint = 0;
+	if (newSize == oldFileSize)
+		return YAFFS_OK;
+		
+	if(newSize > oldFileSize){
+		yaffs2_HandleHole(in,newSize);
+		in->variant.fileVariant.fileSize = newSize;
+	} else {
+		/* newSize < oldFileSize */ 
+		yaffs_ResizeDown(in, newSize);
+	} 
+
+	/* Write a new object header to reflect the resize.
+	 * show we've shrunk the file, if need be
+	 * Do this only if the file is not in the deleted directories
+	 * and is not shadowed.
+	 */
+	if (in->parent &&
+	    !in->isShadowed &&
+	    in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+	    in->parent->objectId != YAFFS_OBJECTID_DELETED)
+		yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL);
+
 
-	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+	return YAFFS_OK;
+}
 
-	/* Scan all the blocks to determine their state */
-	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
-		bi = yaffs_GetBlockInfo(dev, blk);
-		yaffs_ClearChunkBits(dev, blk);
-		bi->pagesInUse = 0;
-		bi->softDeletions = 0;
+loff_t yaffs_GetFileSize(yaffs_Object *obj)
+{
+	YCHAR *alias = NULL;
+	obj = yaffs_GetEquivalentObject(obj);
+
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return obj->variant.fileVariant.fileSize;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		alias = obj->variant.symLinkVariant.alias;
+		if(!alias)
+			return 0;
+		return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
+	default:
+		return 0;
+	}
+}
 
-		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
 
-		bi->blockState = state;
-		bi->sequenceNumber = sequenceNumber;
 
-		if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
-			bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
-		if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
-			bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
+{
+	int retVal;
+	if (in->dirty) {
+		yaffs_FlushFilesChunkCache(in);
+		if(dataSync) /* Only sync data */
+			retVal=YAFFS_OK;
+		else {
+			if (updateTime) {
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_WinFileTimeNow(in->win_mtime);
+#else
 
-		T(YAFFS_TRACE_SCAN_DEBUG,
-		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
-		   state, sequenceNumber));
+				in->yst_mtime = Y_CURRENT_TIME;
 
+#endif
+			}
 
-		if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
-			dev->blocksInCheckpoint++;
+			retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL) >=
+				0) ? YAFFS_OK : YAFFS_FAIL;
+		}
+	} else {
+		retVal = YAFFS_OK;
+	}
 
-		} else if (state == YAFFS_BLOCK_STATE_DEAD) {
-			T(YAFFS_TRACE_BAD_BLOCKS,
-			  (TSTR("block %d is bad" TENDSTR), blk));
-		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
-			T(YAFFS_TRACE_SCAN_DEBUG,
-			  (TSTR("Block empty " TENDSTR)));
-			dev->nErasedBlocks++;
-			dev->nFreeChunks += dev->nChunksPerBlock;
-		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+	return retVal;
 
-			/* Determine the highest sequence number */
-			if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
-			    sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+}
 
-				blockIndex[nBlocksToScan].seq = sequenceNumber;
-				blockIndex[nBlocksToScan].block = blk;
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
+{
 
-				nBlocksToScan++;
+	/* First off, invalidate the file's data in the cache, without flushing. */
+	yaffs_InvalidateWholeChunkCache(in);
 
-				if (sequenceNumber >= dev->sequenceNumber)
-					dev->sequenceNumber = sequenceNumber;
-			} else {
-				/* TODO: Nasty sequence number! */
-				T(YAFFS_TRACE_SCAN,
-				  (TSTR
-				   ("Block scanning block %d has bad sequence number %d"
-				    TENDSTR), blk, sequenceNumber));
+	if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
+		/* Move to the unlinked directory so we have a record that it was deleted. */
+		yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
 
-			}
-		}
 	}
 
-	T(YAFFS_TRACE_SCAN,
-	(TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
+	yaffs_RemoveObjectFromDirectory(in);
+	yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
+	in->hdrChunk = 0;
 
+	yaffs_FreeObject(in);
+	return YAFFS_OK;
 
+}
 
-	YYIELD();
+/* yaffs_DeleteFile deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
+{
 
-	/* Sort the blocks */
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
-	{
-		/* Use qsort now. */
-		yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
-	}
-#else
-	{
-		/* Dungy old bubble sort... */
+	int retVal;
+	int immediateDeletion = 0;
+	yaffs_Device *dev = in->myDev;
 
-		yaffs_BlockIndex temp;
-		int i;
-		int j;
+	if (!in->myInode)
+		immediateDeletion = 1;
 
-		for (i = 0; i < nBlocksToScan; i++)
-			for (j = i + 1; j < nBlocksToScan; j++)
-				if (blockIndex[i].seq > blockIndex[j].seq) {
-					temp = blockIndex[j];
-					blockIndex[j] = blockIndex[i];
-					blockIndex[i] = temp;
-				}
+	if (immediateDeletion) {
+		retVal =
+		    yaffs_ChangeObjectName(in, in->myDev->deletedDir,
+					   _Y("deleted"), 0, 0);
+		T(YAFFS_TRACE_TRACING,
+		  (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
+		   in->objectId));
+		in->deleted = 1;
+		in->myDev->nDeletedFiles++;
+		if (dev->param.disableSoftDelete || dev->param.isYaffs2)
+			yaffs_ResizeFile(in, 0);
+		yaffs_SoftDeleteFile(in);
+	} else {
+		retVal =
+		    yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
+					   _Y("unlinked"), 0, 0);
 	}
-#endif
 
-	YYIELD();
 
-	T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
+	return retVal;
+}
+
+int yaffs_DeleteFile(yaffs_Object *in)
+{
+	int retVal = YAFFS_OK;
+	int deleted; /* Need to cache value on stack if in is freed */
+	yaffs_Device *dev = in->myDev;
+
+	if (dev->param.disableSoftDelete || dev->param.isYaffs2)
+		yaffs_ResizeFile(in, 0);
+
+	if (in->nDataChunks > 0) {
+		/* Use soft deletion if there is data in the file.
+		 * That won't be the case if it has been resized to zero.
+		 */
+		if (!in->unlinked)
+			retVal = yaffs_UnlinkFileIfNeeded(in);
 
-	/* Now scan the blocks looking at the data. */
-	startIterator = 0;
-	endIterator = nBlocksToScan - 1;
-	T(YAFFS_TRACE_SCAN_DEBUG,
-	  (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
+		deleted = in->deleted;
 
-	/* For each block.... backwards */
-	for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
-			blockIterator--) {
-		/* Cooperative multitasking! This loop can run for so
-		   long that watchdog timers expire. */
-		YYIELD();
+		if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
+			in->deleted = 1;
+			deleted = 1;
+			in->myDev->nDeletedFiles++;
+			yaffs_SoftDeleteFile(in);
+		}
+		return deleted ? YAFFS_OK : YAFFS_FAIL;
+	} else {
+		/* The file has no data chunks so we toss it immediately */
+		yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
+		in->variant.fileVariant.top = NULL;
+		yaffs_DoGenericObjectDeletion(in);
 
-		/* get the block to scan in the correct order */
-		blk = blockIndex[blockIterator].block;
+		return YAFFS_OK;
+	}
+}
 
-		bi = yaffs_GetBlockInfo(dev, blk);
+static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
+{
+	return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+		!(ylist_empty(&obj->variant.directoryVariant.children));
+}
 
+static int yaffs_DeleteDirectory(yaffs_Object *obj)
+{
+	/* First check that the directory is empty. */
+	if (yaffs_IsNonEmptyDirectory(obj))
+		return YAFFS_FAIL;
 
-		state = bi->blockState;
+	return yaffs_DoGenericObjectDeletion(obj);
+}
 
-		deleted = 0;
+static int yaffs_DeleteSymLink(yaffs_Object *in)
+{
+	if(in->variant.symLinkVariant.alias)
+		YFREE(in->variant.symLinkVariant.alias);
+	in->variant.symLinkVariant.alias=NULL;
 
-		/* For each chunk in each block that needs scanning.... */
-		foundChunksInBlock = 0;
-		for (c = dev->nChunksPerBlock - 1;
-		     !alloc_failed && c >= 0 &&
-		     (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-		      state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
-			/* Scan backwards...
-			 * Read the tags and decide what to do
-			 */
+	return yaffs_DoGenericObjectDeletion(in);
+}
 
-			chunk = blk * dev->nChunksPerBlock + c;
+static int yaffs_DeleteHardLink(yaffs_Object *in)
+{
+	/* remove this hardlink from the list assocaited with the equivalent
+	 * object
+	 */
+	ylist_del_init(&in->hardLinks);
+	return yaffs_DoGenericObjectDeletion(in);
+}
 
-			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
-							&tags);
+int yaffs_DeleteObject(yaffs_Object *obj)
+{
+int retVal = -1;
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		retVal = yaffs_DeleteFile(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
+			T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
+			ylist_del_init(&obj->variant.directoryVariant.dirty);
+		}
+		return yaffs_DeleteDirectory(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		retVal = yaffs_DeleteSymLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		retVal = yaffs_DeleteHardLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		retVal = yaffs_DoGenericObjectDeletion(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		retVal = 0;
+		break;		/* should not happen. */
+	}
 
-			/* Let's have a good look at this chunk... */
+	return retVal;
+}
 
-			if (!tags.chunkUsed) {
-				/* An unassigned chunk in the block.
-				 * If there are used chunks after this one, then
-				 * it is a chunk that was skipped due to failing the erased
-				 * check. Just skip it so that it can be deleted.
-				 * But, more typically, We get here when this is an unallocated
-				 * chunk and his means that either the block is empty or
-				 * this is the one being allocated from
-				 */
+static int yaffs_UnlinkWorker(yaffs_Object *obj)
+{
 
-				if (foundChunksInBlock) {
-					/* This is a chunk that was skipped due to failing the erased check */
-				} else if (c == 0) {
-					/* We're looking at the first chunk in the block so the block is unused */
-					state = YAFFS_BLOCK_STATE_EMPTY;
-					dev->nErasedBlocks++;
-				} else {
-					if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-					    state == YAFFS_BLOCK_STATE_ALLOCATING) {
-						if (dev->sequenceNumber == bi->sequenceNumber) {
-							/* this is the block being allocated from */
-
-							T(YAFFS_TRACE_SCAN,
-							  (TSTR
-							   (" Allocating from %d %d"
-							    TENDSTR), blk, c));
-
-							state = YAFFS_BLOCK_STATE_ALLOCATING;
-							dev->allocationBlock = blk;
-							dev->allocationPage = c;
-							dev->allocationBlockFinder = blk;
-						} else {
-							/* This is a partially written block that is not
-							 * the current allocation block. This block must have
-							 * had a write failure, so set up for retirement.
-							 */
-
-							 /* bi->needsRetiring = 1; ??? TODO */
-							 bi->gcPrioritise = 1;
-
-							 T(YAFFS_TRACE_ALWAYS,
-							 (TSTR("Partially written block %d detected" TENDSTR),
-							 blk));
-						}
-					}
-				}
+	int immediateDeletion = 0;
 
-				dev->nFreeChunks++;
+	if (!obj->myInode)
+		immediateDeletion = 1;
 
-			} else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
-				T(YAFFS_TRACE_SCAN,
-				  (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
-				  blk, c));
-
-				  dev->nFreeChunks++;
-
-			} else if (tags.chunkId > 0) {
-				/* chunkId > 0 so it is a data chunk... */
-				unsigned int endpos;
-				__u32 chunkBase =
-				    (tags.chunkId - 1) * dev->nDataBytesPerChunk;
-
-				foundChunksInBlock = 1;
-
-
-				yaffs_SetChunkBit(dev, blk, c);
-				bi->pagesInUse++;
-
-				in = yaffs_FindOrCreateObjectByNumber(dev,
-								      tags.
-								      objectId,
-								      YAFFS_OBJECT_TYPE_FILE);
-				if (!in) {
-					/* Out of memory */
-					alloc_failed = 1;
-				}
+	if(obj)
+		yaffs_UpdateParent(obj->parent);
 
-				if (in &&
-				    in->variantType == YAFFS_OBJECT_TYPE_FILE
-				    && chunkBase <
-				    in->variant.fileVariant.shrinkSize) {
-					/* This has not been invalidated by a resize */
-					if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
-							       chunk, -1)) {
-						alloc_failed = 1;
-					}
+	if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+		return yaffs_DeleteHardLink(obj);
+	} else if (!ylist_empty(&obj->hardLinks)) {
+		/* Curve ball: We're unlinking an object that has a hardlink.
+		 *
+		 * This problem arises because we are not strictly following
+		 * The Linux link/inode model.
+		 *
+		 * We can't really delete the object.
+		 * Instead, we do the following:
+		 * - Select a hardlink.
+		 * - Unhook it from the hard links
+		 * - Move it from its parent directory (so that the rename can work)
+		 * - Rename the object to the hardlink's name.
+		 * - Delete the hardlink
+		 */
 
-					/* File size is calculated by looking at the data chunks if we have not
-					 * seen an object header yet. Stop this practice once we find an object header.
-					 */
-					endpos =
-					    (tags.chunkId -
-					     1) * dev->nDataBytesPerChunk +
-					    tags.byteCount;
-
-					if (!in->valid &&	/* have not got an object header yet */
-					    in->variant.fileVariant.
-					    scannedFileSize < endpos) {
-						in->variant.fileVariant.
-						    scannedFileSize = endpos;
-						in->variant.fileVariant.
-						    fileSize =
-						    in->variant.fileVariant.
-						    scannedFileSize;
-					}
+		yaffs_Object *hl;
+		yaffs_Object *parent;
+		int retVal;
+		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
 
-				} else if (in) {
-					/* This chunk has been invalidated by a resize, so delete */
-					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+		hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
 
-				}
-			} else {
-				/* chunkId == 0, so it is an ObjectHeader.
-				 * Thus, we read in the object header and make the object
-				 */
-				foundChunksInBlock = 1;
+		yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+		parent = hl->parent;
 
-				yaffs_SetChunkBit(dev, blk, c);
-				bi->pagesInUse++;
+		ylist_del_init(&hl->hardLinks);
 
-				oh = NULL;
-				in = NULL;
+ 		yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
 
-				if (tags.extraHeaderInfoAvailable) {
-					in = yaffs_FindOrCreateObjectByNumber
-					    (dev, tags.objectId,
-					     tags.extraObjectType);
-					if (!in)
-						alloc_failed = 1;
-				}
+		retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
 
-				if (!in ||
-#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
-				    !in->valid ||
-#endif
-				    tags.extraShadows ||
-				    (!in->valid &&
-				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
-				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
-
-					/* If we don't have  valid info then we need to read the chunk
-					 * TODO In future we can probably defer reading the chunk and
-					 * living with invalid data until needed.
-					 */
+		if (retVal == YAFFS_OK)
+			retVal = yaffs_DoGenericObjectDeletion(hl);
 
-					result = yaffs_ReadChunkWithTagsFromNAND(dev,
-									chunk,
-									chunkData,
-									NULL);
-
-					oh = (yaffs_ObjectHeader *) chunkData;
-
-					if (dev->inbandTags) {
-						/* Fix up the header if they got corrupted by inband tags */
-						oh->shadowsObject = oh->inbandShadowsObject;
-						oh->isShrink = oh->inbandIsShrink;
-					}
+		return retVal;
 
-					if (!in) {
-						in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
-						if (!in)
-							alloc_failed = 1;
-					}
+	} else if (immediateDeletion) {
+		switch (obj->variantType) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			return yaffs_DeleteFile(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			ylist_del_init(&obj->variant.directoryVariant.dirty);
+			return yaffs_DeleteDirectory(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			return yaffs_DeleteSymLink(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			return yaffs_DoGenericObjectDeletion(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+		default:
+			return YAFFS_FAIL;
+		}
+	} else if(yaffs_IsNonEmptyDirectory(obj))
+		return YAFFS_FAIL;
+	else
+		return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
+					   _Y("unlinked"), 0, 0);
+}
 
-				}
 
-				if (!in) {
-					/* TODO Hoosterman we have a problem! */
-					T(YAFFS_TRACE_ERROR,
-					  (TSTR
-					   ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
-					    TENDSTR), tags.objectId, chunk));
-					continue;
-				}
+static int yaffs_UnlinkObject(yaffs_Object *obj)
+{
 
-				if (in->valid) {
-					/* We have already filled this one.
-					 * We have a duplicate that will be discarded, but
-					 * we first have to suck out resize info if it is a file.
-					 */
+	if (obj && obj->unlinkAllowed)
+		return yaffs_UnlinkWorker(obj);
 
-					if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
-					     ((oh &&
-					       oh->type == YAFFS_OBJECT_TYPE_FILE) ||
-					      (tags.extraHeaderInfoAvailable  &&
-					       tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
-						__u32 thisSize =
-						    (oh) ? oh->fileSize : tags.
-						    extraFileLength;
-						__u32 parentObjectId =
-						    (oh) ? oh->
-						    parentObjectId : tags.
-						    extraParentObjectId;
-
-
-						isShrink =
-						    (oh) ? oh->isShrink : tags.
-						    extraIsShrinkHeader;
+	return YAFFS_FAIL;
 
-						/* If it is deleted (unlinked at start also means deleted)
-						 * we treat the file size as being zeroed at this point.
-						 */
-						if (parentObjectId ==
-						    YAFFS_OBJECTID_DELETED
-						    || parentObjectId ==
-						    YAFFS_OBJECTID_UNLINKED) {
-							thisSize = 0;
-							isShrink = 1;
-						}
+}
+int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
+{
+	yaffs_Object *obj;
 
-						if (isShrink &&
-						    in->variant.fileVariant.
-						    shrinkSize > thisSize) {
-							in->variant.fileVariant.
-							    shrinkSize =
-							    thisSize;
-						}
+	obj = yaffs_FindObjectByName(dir, name);
+	return yaffs_UnlinkObject(obj);
+}
 
-						if (isShrink)
-							bi->hasShrinkHeader = 1;
+/*----------------------- Initialisation Scanning ---------------------- */
 
-					}
-					/* Use existing - destroy this one. */
-					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
+				int backwardScanning)
+{
+	yaffs_Object *obj;
 
-				}
+	if (!backwardScanning) {
+		/* Handle YAFFS1 forward scanning case
+		 * For YAFFS1 we always do the deletion
+		 */
 
-				if (!in->valid && in->variantType !=
-				    (oh ? oh->type : tags.extraObjectType))
-					T(YAFFS_TRACE_ERROR, (
-						TSTR("yaffs tragedy: Bad object type, "
-					    TCONT("%d != %d, for object %d at chunk ")
-					    TCONT("%d during scan")
-						TENDSTR), oh ?
-					    oh->type : tags.extraObjectType,
-					    in->variantType, tags.objectId,
-					    chunk));
-
-				if (!in->valid &&
-				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
-				     tags.objectId ==
-				     YAFFS_OBJECTID_LOSTNFOUND)) {
-					/* We only load some info, don't fiddle with directory structure */
-					in->valid = 1;
+	} else {
+		/* Handle YAFFS2 case (backward scanning)
+		 * If the shadowed object exists then ignore.
+		 */
+		obj = yaffs_FindObjectByNumber(dev, objId);
+		if(obj)
+			return;
+	}
 
-					if (oh) {
-						in->variantType = oh->type;
+	/* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+	 * We put it in unlinked dir to be cleaned up after the scanning
+	 */
+	obj =
+	    yaffs_FindOrCreateObjectByNumber(dev, objId,
+					     YAFFS_OBJECT_TYPE_FILE);
+	if (!obj)
+		return;
+	obj->isShadowed = 1;
+	yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
+	obj->variant.fileVariant.shrinkSize = 0;
+	obj->valid = 1;		/* So that we don't read any other info for this file */
 
-						in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-						in->win_atime[0] = oh->win_atime[0];
-						in->win_ctime[0] = oh->win_ctime[0];
-						in->win_mtime[0] = oh->win_mtime[0];
-						in->win_atime[1] = oh->win_atime[1];
-						in->win_ctime[1] = oh->win_ctime[1];
-						in->win_mtime[1] = oh->win_mtime[1];
-#else
-						in->yst_uid = oh->yst_uid;
-						in->yst_gid = oh->yst_gid;
-						in->yst_atime = oh->yst_atime;
-						in->yst_mtime = oh->yst_mtime;
-						in->yst_ctime = oh->yst_ctime;
-						in->yst_rdev = oh->yst_rdev;
+}
 
-#endif
-					} else {
-						in->variantType = tags.extraObjectType;
-						in->lazyLoaded = 1;
-					}
 
-					in->hdrChunk = chunk;
+void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
+{
+	yaffs_Object *hl;
+	yaffs_Object *in;
 
-				} else if (!in->valid) {
-					/* we need to load this info */
+	while (hardList) {
+		hl = hardList;
+		hardList = (yaffs_Object *) (hardList->hardLinks.next);
 
-					in->valid = 1;
-					in->hdrChunk = chunk;
+		in = yaffs_FindObjectByNumber(dev,
+					      hl->variant.hardLinkVariant.
+					      equivalentObjectId);
 
-					if (oh) {
-						in->variantType = oh->type;
+		if (in) {
+			/* Add the hardlink pointers */
+			hl->variant.hardLinkVariant.equivalentObject = in;
+			ylist_add(&hl->hardLinks, &in->hardLinks);
+		} else {
+			/* Todo Need to report/handle this better.
+			 * Got a problem... hardlink to a non-existant object
+			 */
+			hl->variant.hardLinkVariant.equivalentObject = NULL;
+			YINIT_LIST_HEAD(&hl->hardLinks);
 
-						in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-						in->win_atime[0] = oh->win_atime[0];
-						in->win_ctime[0] = oh->win_ctime[0];
-						in->win_mtime[0] = oh->win_mtime[0];
-						in->win_atime[1] = oh->win_atime[1];
-						in->win_ctime[1] = oh->win_ctime[1];
-						in->win_mtime[1] = oh->win_mtime[1];
-#else
-						in->yst_uid = oh->yst_uid;
-						in->yst_gid = oh->yst_gid;
-						in->yst_atime = oh->yst_atime;
-						in->yst_mtime = oh->yst_mtime;
-						in->yst_ctime = oh->yst_ctime;
-						in->yst_rdev = oh->yst_rdev;
-#endif
+		}
+	}
+}
 
-						if (oh->shadowsObject > 0)
-							yaffs_HandleShadowedObject(dev,
-									   oh->
-									   shadowsObject,
-									   1);
-
-
-						yaffs_SetObjectName(in, oh->name);
-						parent =
-						    yaffs_FindOrCreateObjectByNumber
-							(dev, oh->parentObjectId,
-							 YAFFS_OBJECT_TYPE_DIRECTORY);
-
-						 fileSize = oh->fileSize;
-						 isShrink = oh->isShrink;
-						 equivalentObjectId = oh->equivalentObjectId;
 
-					} else {
-						in->variantType = tags.extraObjectType;
-						parent =
-						    yaffs_FindOrCreateObjectByNumber
-							(dev, tags.extraParentObjectId,
-							 YAFFS_OBJECT_TYPE_DIRECTORY);
-						 fileSize = tags.extraFileLength;
-						 isShrink = tags.extraIsShrinkHeader;
-						 equivalentObjectId = tags.extraEquivalentObjectId;
-						in->lazyLoaded = 1;
+static void yaffs_StripDeletedObjects(yaffs_Device *dev)
+{
+	/*
+	*  Sort out state of unlinked and deleted objects after scanning.
+	*/
+	struct ylist_head *i;
+	struct ylist_head *n;
+	yaffs_Object *l;
 
-					}
-					in->dirty = 0;
+	if (dev->readOnly)
+		return;
 
-					if (!parent)
-						alloc_failed = 1;
+	/* Soft delete all the unlinked files */
+	ylist_for_each_safe(i, n,
+		&dev->unlinkedDir->variant.directoryVariant.children) {
+		if (i) {
+			l = ylist_entry(i, yaffs_Object, siblings);
+			yaffs_DeleteObject(l);
+		}
+	}
 
-					/* directory stuff...
-					 * hook up to parent
-					 */
+	ylist_for_each_safe(i, n,
+		&dev->deletedDir->variant.directoryVariant.children) {
+		if (i) {
+			l = ylist_entry(i, yaffs_Object, siblings);
+			yaffs_DeleteObject(l);
+		}
+	}
 
-					if (parent && parent->variantType ==
-					    YAFFS_OBJECT_TYPE_UNKNOWN) {
-						/* Set up as a directory */
-						parent->variantType =
-							YAFFS_OBJECT_TYPE_DIRECTORY;
-						YINIT_LIST_HEAD(&parent->variant.
-							directoryVariant.
-							children);
-					} else if (!parent || parent->variantType !=
-						   YAFFS_OBJECT_TYPE_DIRECTORY) {
-						/* Hoosterman, another problem....
-						 * We're trying to use a non-directory as a directory
-						 */
+}
 
-						T(YAFFS_TRACE_ERROR,
-						  (TSTR
-						   ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
-						    TENDSTR)));
-						parent = dev->lostNFoundDir;
-					}
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ *  This code assumes that we don't ever change the current relationships between
+ *  directories:
+ *   rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
+ *   lostNfound->parent == rootDir
+ *
+ * This fixes the problem where directories might have inadvertently been deleted
+ * leaving the object "hanging" without being rooted in the directory tree.
+ */
+ 
+static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
+{
+	return (obj == dev->deletedDir ||
+		obj == dev->unlinkedDir||
+		obj == dev->rootDir);
+}
 
-					yaffs_AddObjectToDirectory(parent, in);
+static void yaffs_FixHangingObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_Object *parent;
+	int i;
+	struct ylist_head *lh;
+	struct ylist_head *n;
+	int depthLimit;
+	int hanging;
 
-					itsUnlinked = (parent == dev->deletedDir) ||
-						      (parent == dev->unlinkedDir);
+	if (dev->readOnly)
+		return;
 
-					if (isShrink) {
-						/* Mark the block as having a shrinkHeader */
-						bi->hasShrinkHeader = 1;
-					}
+	/* Iterate through the objects in each hash entry,
+	 * looking at each object.
+	 * Make sure it is rooted.
+	 */
 
-					/* Note re hardlinks.
-					 * Since we might scan a hardlink before its equivalent object is scanned
-					 * we put them all in a list.
-					 * After scanning is complete, we should have all the objects, so we run
-					 * through this list and fix up all the chains.
+	for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
+		ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = ylist_entry(lh, yaffs_Object, hashLink);
+				parent= obj->parent;
+				
+				if(yaffs_HasNULLParent(dev,obj)){
+					/* These directories are not hanging */
+					hanging = 0;
+				}
+				else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+					hanging = 1;
+				else if(yaffs_HasNULLParent(dev,parent))
+					hanging = 0;
+				else {
+					/*
+					 * Need to follow the parent chain to see if it is hanging.
 					 */
+					hanging = 0;
+					depthLimit=100;
 
-					switch (in->variantType) {
-					case YAFFS_OBJECT_TYPE_UNKNOWN:
-						/* Todo got a problem */
-						break;
-					case YAFFS_OBJECT_TYPE_FILE:
-
-						if (in->variant.fileVariant.
-						    scannedFileSize < fileSize) {
-							/* This covers the case where the file size is greater
-							 * than where the data is
-							 * This will happen if the file is resized to be larger
-							 * than its current data extents.
-							 */
-							in->variant.fileVariant.fileSize = fileSize;
-							in->variant.fileVariant.scannedFileSize =
-							    in->variant.fileVariant.fileSize;
-						}
-
-						if (isShrink &&
-						    in->variant.fileVariant.shrinkSize > fileSize) {
-							in->variant.fileVariant.shrinkSize = fileSize;
-						}
-
-						break;
-					case YAFFS_OBJECT_TYPE_HARDLINK:
-						if (!itsUnlinked) {
-							in->variant.hardLinkVariant.equivalentObjectId =
-								equivalentObjectId;
-							in->hardLinks.next =
-								(struct ylist_head *) hardList;
-							hardList = in;
-						}
-						break;
-					case YAFFS_OBJECT_TYPE_DIRECTORY:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SPECIAL:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SYMLINK:
-						if (oh) {
-							in->variant.symLinkVariant.alias =
-								yaffs_CloneString(oh->alias);
-							if (!in->variant.symLinkVariant.alias)
-								alloc_failed = 1;
-						}
-						break;
+					while(parent != dev->rootDir &&
+						parent->parent &&
+						parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+						depthLimit > 0){
+						parent = parent->parent;
+						depthLimit--;
 					}
-
+					if(parent != dev->rootDir)
+						hanging = 1;
+				}
+				if(hanging){
+					T(YAFFS_TRACE_SCAN,
+					  (TSTR("Hanging object %d moved to lost and found" TENDSTR),
+					  	obj->objectId));
+					yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
 				}
-
 			}
+		}
+	}
+}
 
-		} /* End of scanning for each chunk */
 
-		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-			/* If we got this far while scanning, then the block is fully allocated. */
-			state = YAFFS_BLOCK_STATE_FULL;
-		}
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
+{
+	yaffs_Object *obj;
+	struct ylist_head *lh;
+	struct ylist_head *n;
 
-		bi->blockState = state;
+	if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+		YBUG();
+	
+	ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
+		if (lh) {
+			obj = ylist_entry(lh, yaffs_Object, siblings);
+			if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
+				yaffs_DeleteDirectoryContents(obj);
+
+			T(YAFFS_TRACE_SCAN,
+				(TSTR("Deleting lost_found object %d" TENDSTR),
+				obj->objectId));
 
-		/* Now let's see if it was dirty */
-		if (bi->pagesInUse == 0 &&
-		    !bi->hasShrinkHeader &&
-		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
-			yaffs_BlockBecameDirty(dev, blk);
+			/* Need to use UnlinkObject since Delete would not handle
+			 * hardlinked objects correctly.
+			 */
+			yaffs_UnlinkObject(obj); 
 		}
-
 	}
+			
+}
 
-	if (altBlockIndex)
-		YFREE_ALT(blockIndex);
-	else
-		YFREE(blockIndex);
+static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
+{
+	yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
+}
 
-	/* Ok, we've done all the scanning.
-	 * Fix up the hard link chains.
-	 * We should now have scanned all the objects, now it's time to add these
-	 * hardlinks.
-	 */
-	yaffs_HardlinkFixup(dev, hardList);
+static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
+{
+	__u8 *chunkData;
+	yaffs_ObjectHeader *oh;
+	yaffs_Device *dev;
+	yaffs_ExtendedTags tags;
+	int result;
+	int alloc_failed = 0;
 
+	if (!in)
+		return;
 
-	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+	dev = in->myDev;
 
-	if (alloc_failed)
-		return YAFFS_FAIL;
+#if 0
+	T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
+		in->objectId,
+		in->lazyLoaded ? "not yet" : "already"));
+#endif
 
-	T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
+	if (in->lazyLoaded && in->hdrChunk > 0) {
+		in->lazyLoaded = 0;
+		chunkData = yaffs_GetTempBuffer(dev, __LINE__);
 
-	return YAFFS_OK;
-}
+		result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
+		oh = (yaffs_ObjectHeader *) chunkData;
 
-/*------------------------------  Directory Functions ----------------------------- */
+		in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+		in->win_atime[0] = oh->win_atime[0];
+		in->win_ctime[0] = oh->win_ctime[0];
+		in->win_mtime[0] = oh->win_mtime[0];
+		in->win_atime[1] = oh->win_atime[1];
+		in->win_ctime[1] = oh->win_ctime[1];
+		in->win_mtime[1] = oh->win_mtime[1];
+#else
+		in->yst_uid = oh->yst_uid;
+		in->yst_gid = oh->yst_gid;
+		in->yst_atime = oh->yst_atime;
+		in->yst_mtime = oh->yst_mtime;
+		in->yst_ctime = oh->yst_ctime;
+		in->yst_rdev = oh->yst_rdev;
 
-static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
-{
-	struct ylist_head *lh;
-	yaffs_Object *listObj;
+#endif
+		yaffs_SetObjectNameFromOH(in, oh);
 
-	int count = 0;
+		if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
+			in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->alias);
+			if (!in->variant.symLinkVariant.alias)
+				alloc_failed = 1; /* Not returned to caller */
+		}
 
-	if (!obj) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
-		YBUG();
-		return;
+		yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
 	}
+}
 
-	if (yaffs_SkipVerification(obj->myDev))
-		return;
+/*------------------------------  Directory Functions ----------------------------- */
 
-	if (!obj->parent) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
-		YBUG();
+/*
+ *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
+ * called periodically.
+ */
+ 
+static void yaffs_UpdateParent(yaffs_Object *obj)
+{
+	yaffs_Device *dev;
+	if(!obj)
 		return;
-	}
-
-	if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
-		YBUG();
-	}
-
-	/* Iterate through the objects in each hash entry */
+#ifndef CONFIG_YAFFS_WINCE
 
-	ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
-		if (lh) {
-			listObj = ylist_entry(lh, yaffs_Object, siblings);
-			yaffs_VerifyObject(listObj);
-			if (obj == listObj)
-				count++;
+	dev = obj->myDev;
+	obj->dirty = 1;
+	obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
+	if(dev->param.deferDirectoryUpdate){
+		struct ylist_head *link = &obj->variant.directoryVariant.dirty; 
+	
+		if(ylist_empty(link)){
+			ylist_add(link,&dev->dirtyDirectories);
+			T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->objectId));
 		}
-	 }
 
-	if (count != 1) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
-		YBUG();
-	}
+	} else
+		yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL);
+#endif
 }
 
-static void yaffs_VerifyDirectory(yaffs_Object *directory)
+void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
 {
-	struct ylist_head *lh;
-	yaffs_Object *listObj;
-
-	if (!directory) {
-		YBUG();
-		return;
-	}
+	struct ylist_head *link;
+	yaffs_Object *obj;
+	yaffs_DirectoryStructure *dS;
+	yaffs_ObjectVariant *oV;
 
-	if (yaffs_SkipFullVerification(directory->myDev))
-		return;
+	T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
 
-	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
-		YBUG();
-	}
+	while(!ylist_empty(&dev->dirtyDirectories)){
+		link = dev->dirtyDirectories.next;
+		ylist_del_init(link);
+		
+		dS=ylist_entry(link,yaffs_DirectoryStructure,dirty);
+		oV = ylist_entry(dS,yaffs_ObjectVariant,directoryVariant);
+		obj = ylist_entry(oV,yaffs_Object,variant);
 
-	/* Iterate through the objects in each hash entry */
+		T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
 
-	ylist_for_each(lh, &directory->variant.directoryVariant.children) {
-		if (lh) {
-			listObj = ylist_entry(lh, yaffs_Object, siblings);
-			if (listObj->parent != directory) {
-				T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
-				YBUG();
-			}
-			yaffs_VerifyObjectInDirectory(listObj);
-		}
+		if(obj->dirty)
+			yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL);
 	}
 }
 
-
 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
 {
 	yaffs_Device *dev = obj->myDev;
@@ -6677,18 +4474,17 @@ static void yaffs_RemoveObjectFromDirect
 
 	yaffs_VerifyDirectory(parent);
 
-	if (dev && dev->removeObjectCallback)
-		dev->removeObjectCallback(obj);
+	if (dev && dev->param.removeObjectCallback)
+		dev->param.removeObjectCallback(obj);
 
 
 	ylist_del_init(&obj->siblings);
 	obj->parent = NULL;
-
+	
 	yaffs_VerifyDirectory(parent);
 }
 
-
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
+void yaffs_AddObjectToDirectory(yaffs_Object *directory,
 					yaffs_Object *obj)
 {
 	if (!directory) {
@@ -6781,7 +4577,7 @@ yaffs_Object *yaffs_FindObjectByName(yaf
 				 * Do a real check
 				 */
 				yaffs_GetObjectName(l, buffer,
-						    YAFFS_MAX_NAME_LENGTH);
+						    YAFFS_MAX_NAME_LENGTH + 1);
 				if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
 					return l;
 			}
@@ -6842,36 +4638,124 @@ yaffs_Object *yaffs_GetEquivalentObject(
 	return obj;
 }
 
-int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
-{
-	memset(name, 0, buffSize * sizeof(YCHAR));
-
-	yaffs_CheckObjectDetailsLoaded(obj);
+/*
+ *  A note or two on object names.
+ *  * If the object name is missing, we then make one up in the form objnnn
+ *
+ *  * ASCII names are stored in the object header's name field from byte zero
+ *  * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ *  - If the name can fit in the ASCII character space then they are saved as 
+ *    ascii names as per above.
+ *  - If the name needs Unicode then the name is saved in Unicode
+ *    starting at oh->name[1].
 
-	if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
-		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
-	} else if (obj->hdrChunk <= 0) {
+ */
+static void yaffs_FixNullName(yaffs_Object * obj,YCHAR * name, int buffSize)
+{
+	/* Create an object name if we could not find one. */
+	if(yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH) == 0){
 		YCHAR locName[20];
 		YCHAR numString[20];
 		YCHAR *x = &numString[19];
 		unsigned v = obj->objectId;
 		numString[19] = 0;
-		while (v > 0) {
+		while(v>0){
 			x--;
 			*x = '0' + (v % 10);
 			v /= 10;
 		}
 		/* make up a name */
 		yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
-		yaffs_strcat(locName, x);
+		yaffs_strcat(locName,x);
 		yaffs_strncpy(name, locName, buffSize - 1);
+	}
+}
+
+static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	if(dev->param.autoUnicode){
+		if(*ohName){
+			/* It is an ASCII name, so do an ASCII to unicode conversion */
+			const char *asciiOhName = (const char *)ohName;
+			int n = bufferSize - 1;
+			while(n > 0 && *asciiOhName){
+				*name = *asciiOhName;
+				name++;
+				asciiOhName++;
+				n--;
+			}
+		} else 
+			yaffs_strncpy(name,ohName+1, bufferSize -1);
+	} else
+#endif
+		yaffs_strncpy(name, ohName, bufferSize - 1);
+}
+
+
+static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev, YCHAR *ohName, const YCHAR *name)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+
+	int isAscii;
+	YCHAR *w;
 
+	if(dev->param.autoUnicode){
+
+		isAscii = 1;
+		w = name;
+	
+		/* Figure out if the name will fit in ascii character set */
+		while(isAscii && *w){
+			if((*w) & 0xff00)
+				isAscii = 0;
+			w++;
+		}
+
+		if(isAscii){
+			/* It is an ASCII name, so do a unicode to ascii conversion */
+			char *asciiOhName = (char *)ohName;
+			int n = YAFFS_MAX_NAME_LENGTH  - 1;
+			while(n > 0 && *name){
+				*asciiOhName= *name;
+				name++;
+				asciiOhName++;
+				n--;
+			}
+		} else{
+			/* It is a unicode name, so save starting at the second YCHAR */
+			*ohName = 0;
+			yaffs_strncpy(ohName+1,name, YAFFS_MAX_NAME_LENGTH -2);
+		}
 	}
+	else 
+#endif
+		yaffs_strncpy(ohName,name, YAFFS_MAX_NAME_LENGTH - 1);
+
+}
+
+int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
+{
+	memset(name, 0, buffSize * sizeof(YCHAR));
+	
+	yaffs_CheckObjectDetailsLoaded(obj);
+
+	if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
+		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
+	} 
 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-	else if (obj->shortName[0])
+	else if (obj->shortName[0]) {
 		yaffs_strcpy(name, obj->shortName);
+	}
 #endif
-	else {
+	else if(obj->hdrChunk > 0) {
 		int result;
 		__u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
 
@@ -6884,14 +4768,17 @@ int yaffs_GetObjectName(yaffs_Object *ob
 							obj->hdrChunk, buffer,
 							NULL);
 		}
-		yaffs_strncpy(name, oh->name, buffSize - 1);
+		yaffs_LoadNameFromObjectHeader(obj->myDev,name,oh->name,buffSize);
 
 		yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
 	}
 
-	return yaffs_strlen(name);
+	yaffs_FixNullName(obj,name,buffSize);
+
+	return yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH);
 }
 
+
 int yaffs_GetObjectFileLength(yaffs_Object *obj)
 {
 	/* Dereference any hard linking */
@@ -6899,9 +4786,11 @@ int yaffs_GetObjectFileLength(yaffs_Obje
 
 	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
 		return obj->variant.fileVariant.fileSize;
-	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
-		return yaffs_strlen(obj->variant.symLinkVariant.alias);
-	else {
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
+		if(!obj->variant.symLinkVariant.alias)
+			return 0;
+		return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
+	} else {
 		/* Only a directory should drop through to here */
 		return obj->myDev->nDataBytesPerChunk;
 	}
@@ -6992,7 +4881,7 @@ int yaffs_SetAttributes(yaffs_Object *ob
 	if (valid & ATTR_SIZE)
 		yaffs_ResizeFile(obj, attr->ia_size);
 
-	yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
+	yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0, NULL);
 
 	return YAFFS_OK;
 
@@ -7025,12 +4914,129 @@ int yaffs_GetAttributes(yaffs_Object *ob
 
 #endif
 
+
+static int yaffs_DoXMod(yaffs_Object *obj, int set, const YCHAR *name, const void *value, int size, int flags)
+{
+	yaffs_XAttrMod xmod;
+
+	int result;
+
+	xmod.set = set;
+	xmod.name = name;
+	xmod.data = value;
+	xmod.size =  size;
+	xmod.flags = flags;
+	xmod.result = -ENOSPC;
+
+	result = yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, &xmod);
+
+	if(result > 0)
+		return xmod.result;
+	else
+		return -ENOSPC;
+}
+
+static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod)
+{
+	int retval = 0;
+	int x_offs = sizeof(yaffs_ObjectHeader);
+	yaffs_Device *dev = obj->myDev;
+	int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
+
+	char * x_buffer = buffer + x_offs;
+
+	if(xmod->set)
+		retval = nval_set(x_buffer, x_size, xmod->name, xmod->data, xmod->size, xmod->flags);
+	else
+		retval = nval_del(x_buffer, x_size, xmod->name);
+
+	obj->hasXattr = nval_hasvalues(x_buffer, x_size);
+	obj->xattrKnown = 1;
+
+	xmod->result = retval;
+
+	return retval;
+}
+
+static int yaffs_DoXFetch(yaffs_Object *obj, const YCHAR *name, void *value, int size)
+{
+	char *buffer = NULL;
+	int result;
+	yaffs_ExtendedTags tags;
+	yaffs_Device *dev = obj->myDev;
+	int x_offs = sizeof(yaffs_ObjectHeader);
+	int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
+
+	char * x_buffer;
+
+	int retval = 0;
+
+	if(obj->hdrChunk < 1)
+		return -ENODATA;
+
+	/* If we know that the object has no xattribs then don't do all the
+	 * reading and parsing.
+	 */
+	if(obj->xattrKnown && !obj->hasXattr){
+		if(name)
+			return -ENODATA;
+		else
+			return 0;
+	}
+
+	buffer = (char *) yaffs_GetTempBuffer(dev, __LINE__);
+	if(!buffer)
+		return -ENOMEM;
+
+	result = yaffs_ReadChunkWithTagsFromNAND(dev,obj->hdrChunk, (__u8 *)buffer, &tags);
+
+	if(result != YAFFS_OK)
+		retval = -ENOENT;
+	else{
+		x_buffer =  buffer + x_offs;
+
+		if (!obj->xattrKnown){
+			obj->hasXattr = nval_hasvalues(x_buffer, x_size);
+			obj->xattrKnown = 1;
+		}
+
+		if(name)
+			retval = nval_get(x_buffer, x_size, name, value, size);
+		else
+			retval = nval_list(x_buffer, x_size, value,size);
+	}
+	yaffs_ReleaseTempBuffer(dev,(__u8 *)buffer,__LINE__);
+	return retval;
+}
+
+int yaffs_SetXAttribute(yaffs_Object *obj, const YCHAR *name, const void * value, int size, int flags)
+{
+	return yaffs_DoXMod(obj, 1, name, value, size, flags);
+}
+
+int yaffs_RemoveXAttribute(yaffs_Object *obj, const YCHAR *name)
+{
+	return yaffs_DoXMod(obj, 0, name, NULL, 0, 0);
+}
+
+int yaffs_GetXAttribute(yaffs_Object *obj, const YCHAR *name, void *value, int size)
+{
+	return yaffs_DoXFetch(obj, name, value, size);
+}
+
+int yaffs_ListXAttributes(yaffs_Object *obj, char *buffer, int size)
+{
+	return yaffs_DoXFetch(obj, NULL, buffer,size);
+}
+
+
+
 #if 0
 int yaffs_DumpObject(yaffs_Object *obj)
 {
 	YCHAR name[257];
 
-	yaffs_GetObjectName(obj, name, 256);
+	yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
 
 	T(YAFFS_TRACE_ALWAYS,
 	  (TSTR
@@ -7050,30 +5056,32 @@ static int yaffs_CheckDevFunctions(const
 {
 
 	/* Common functions, gotta have */
-	if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
+	if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
 		return 0;
 
 #ifdef CONFIG_YAFFS_YAFFS2
 
 	/* Can use the "with tags" style interface for yaffs1 or yaffs2 */
-	if (dev->writeChunkWithTagsToNAND &&
-	    dev->readChunkWithTagsFromNAND &&
-	    !dev->writeChunkToNAND &&
-	    !dev->readChunkFromNAND &&
-	    dev->markNANDBlockBad && dev->queryNANDBlock)
+	if (dev->param.writeChunkWithTagsToNAND &&
+	    dev->param.readChunkWithTagsFromNAND &&
+	    !dev->param.writeChunkToNAND &&
+	    !dev->param.readChunkFromNAND &&
+	    dev->param.markNANDBlockBad &&
+	    dev->param.queryNANDBlock)
 		return 1;
 #endif
 
 	/* Can use the "spare" style interface for yaffs1 */
-	if (!dev->isYaffs2 &&
-	    !dev->writeChunkWithTagsToNAND &&
-	    !dev->readChunkWithTagsFromNAND &&
-	    dev->writeChunkToNAND &&
-	    dev->readChunkFromNAND &&
-	    !dev->markNANDBlockBad && !dev->queryNANDBlock)
+	if (!dev->param.isYaffs2 &&
+	    !dev->param.writeChunkWithTagsToNAND &&
+	    !dev->param.readChunkWithTagsFromNAND &&
+	    dev->param.writeChunkToNAND &&
+	    dev->param.readChunkFromNAND &&
+	    !dev->param.markNANDBlockBad &&
+	    !dev->param.queryNANDBlock)
 		return 1;
 
-	return 0;		/* bad */
+	return 0;	/* bad */
 }
 
 
@@ -7120,35 +5128,35 @@ int yaffs_GutsInitialise(yaffs_Device *d
 		return YAFFS_FAIL;
 	}
 
-	dev->internalStartBlock = dev->startBlock;
-	dev->internalEndBlock = dev->endBlock;
+	dev->internalStartBlock = dev->param.startBlock;
+	dev->internalEndBlock = dev->param.endBlock;
 	dev->blockOffset = 0;
 	dev->chunkOffset = 0;
 	dev->nFreeChunks = 0;
 
-	dev->gcBlock = -1;
+	dev->gcBlock = 0;
 
-	if (dev->startBlock == 0) {
-		dev->internalStartBlock = dev->startBlock + 1;
-		dev->internalEndBlock = dev->endBlock + 1;
+	if (dev->param.startBlock == 0) {
+		dev->internalStartBlock = dev->param.startBlock + 1;
+		dev->internalEndBlock = dev->param.endBlock + 1;
 		dev->blockOffset = 1;
-		dev->chunkOffset = dev->nChunksPerBlock;
+		dev->chunkOffset = dev->param.nChunksPerBlock;
 	}
 
 	/* Check geometry parameters. */
 
-	if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
-	    (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
-	    (dev->inbandTags && !dev->isYaffs2) ||
-	     dev->nChunksPerBlock < 2 ||
-	     dev->nReservedBlocks < 2 ||
+	if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
+	    (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
+	    (dev->param.inbandTags && !dev->param.isYaffs2) ||
+	     dev->param.nChunksPerBlock < 2 ||
+	     dev->param.nReservedBlocks < 2 ||
 	     dev->internalStartBlock <= 0 ||
 	     dev->internalEndBlock <= 0 ||
-	     dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) {	/* otherwise it is too small */
+	     dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) {	/* otherwise it is too small */
 		T(YAFFS_TRACE_ALWAYS,
 		  (TSTR
 		   ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
-		    TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
+		    TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
 		return YAFFS_FAIL;
 	}
 
@@ -7159,10 +5167,10 @@ int yaffs_GutsInitialise(yaffs_Device *d
 	}
 
 	/* Sort out space for inband tags, if required */
-	if (dev->inbandTags)
-		dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
+	if (dev->param.inbandTags)
+		dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
 	else
-		dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
+		dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
 
 	/* Got the right mix of functions? */
 	if (!yaffs_CheckDevFunctions(dev)) {
@@ -7209,12 +5217,12 @@ int yaffs_GutsInitialise(yaffs_Device *d
 	 * We need to find the next power of 2 > than internalEndBlock
 	 */
 
-	x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
+	x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
 
 	bits = ShiftsGE(x);
 
 	/* Set up tnode width if wide tnodes are enabled. */
-	if (!dev->wideTnodesDisabled) {
+	if (!dev->param.wideTnodesDisabled) {
 		/* bits must be even so that we end up with 32-bit words */
 		if (bits & 1)
 			bits++;
@@ -7238,10 +5246,13 @@ int yaffs_GutsInitialise(yaffs_Device *d
 	else
 		dev->chunkGroupBits = bits - dev->tnodeWidth;
 
+	dev->tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+	if(dev->tnodeSize < sizeof(yaffs_Tnode))
+		dev->tnodeSize = sizeof(yaffs_Tnode);
 
 	dev->chunkGroupSize = 1 << dev->chunkGroupBits;
 
-	if (dev->nChunksPerBlock < dev->chunkGroupSize) {
+	if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
 		/* We have a problem because the soft delete won't work if
 		 * the chunk group size > chunks per block.
 		 * This can be remedied by using larger "virtual blocks".
@@ -7255,9 +5266,11 @@ int yaffs_GutsInitialise(yaffs_Device *d
 	/* OK, we've finished verifying the device, lets continue with initialisation */
 
 	/* More device initialisation */
-	dev->garbageCollections = 0;
-	dev->passiveGarbageCollections = 0;
-	dev->currentDirtyChecker = 0;
+	dev->allGCs = 0;
+	dev->passiveGCs = 0;
+	dev->oldestDirtyGCs = 0;
+	dev->backgroundGCs = 0;
+	dev->gcBlockFinder = 0;
 	dev->bufferedBlock = -1;
 	dev->doingBufferedBlockRewrite = 0;
 	dev->nDeletedFiles = 0;
@@ -7269,8 +5282,11 @@ int yaffs_GutsInitialise(yaffs_Device *d
 	dev->tagsEccUnfixed = 0;
 	dev->nErasureFailures = 0;
 	dev->nErasedBlocks = 0;
-	dev->isDoingGC = 0;
+	dev->gcDisable= 0;
 	dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
+	YINIT_LIST_HEAD(&dev->dirtyDirectories);
+	dev->oldestDirtySequence = 0;
+	dev->oldestDirtyBlock = 0;
 
 	/* Initialise temporary buffers and caches. */
 	if (!yaffs_InitialiseTempBuffers(dev))
@@ -7281,13 +5297,13 @@ int yaffs_GutsInitialise(yaffs_Device *d
 
 
 	if (!init_failed &&
-	    dev->nShortOpCaches > 0) {
+	    dev->param.nShortOpCaches > 0) {
 		int i;
 		void *buf;
-		int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
+		int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
 
-		if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
-			dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
+		if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
+			dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
 
 		dev->srCache =  YMALLOC(srCacheBytes);
 
@@ -7296,11 +5312,11 @@ int yaffs_GutsInitialise(yaffs_Device *d
 		if (dev->srCache)
 			memset(dev->srCache, 0, srCacheBytes);
 
-		for (i = 0; i < dev->nShortOpCaches && buf; i++) {
+		for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
 			dev->srCache[i].object = NULL;
 			dev->srCache[i].lastUse = 0;
 			dev->srCache[i].dirty = 0;
-			dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
+			dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
 		}
 		if (!buf)
 			init_failed = 1;
@@ -7311,19 +5327,18 @@ int yaffs_GutsInitialise(yaffs_Device *d
 	dev->cacheHits = 0;
 
 	if (!init_failed) {
-		dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
+		dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
 		if (!dev->gcCleanupList)
 			init_failed = 1;
 	}
 
-	if (dev->isYaffs2)
-		dev->useHeaderFileSize = 1;
+	if (dev->param.isYaffs2)
+		dev->param.useHeaderFileSize = 1;
 
 	if (!init_failed && !yaffs_InitialiseBlocks(dev))
 		init_failed = 1;
 
-	yaffs_InitialiseTnodes(dev);
-	yaffs_InitialiseObjects(dev);
+	yaffs_InitialiseTnodesAndObjects(dev);
 
 	if (!init_failed && !yaffs_CreateInitialDirectories(dev))
 		init_failed = 1;
@@ -7331,8 +5346,8 @@ int yaffs_GutsInitialise(yaffs_Device *d
 
 	if (!init_failed) {
 		/* Now scan the flash. */
-		if (dev->isYaffs2) {
-			if (yaffs_CheckpointRestore(dev)) {
+		if (dev->param.isYaffs2) {
+			if (yaffs2_CheckpointRestore(dev)) {
 				yaffs_CheckObjectDetailsLoaded(dev->rootDir);
 				T(YAFFS_TRACE_ALWAYS,
 				  (TSTR("yaffs: restored from checkpoint" TENDSTR)));
@@ -7342,9 +5357,8 @@ int yaffs_GutsInitialise(yaffs_Device *d
 				 * and scan backwards.
 				 */
 				yaffs_DeinitialiseBlocks(dev);
-				yaffs_DeinitialiseTnodes(dev);
-				yaffs_DeinitialiseObjects(dev);
 
+				yaffs_DeinitialiseTnodesAndObjects(dev);
 
 				dev->nErasedBlocks = 0;
 				dev->nFreeChunks = 0;
@@ -7353,24 +5367,25 @@ int yaffs_GutsInitialise(yaffs_Device *d
 				dev->nDeletedFiles = 0;
 				dev->nUnlinkedFiles = 0;
 				dev->nBackgroundDeletions = 0;
-				dev->oldestDirtySequence = 0;
 
 				if (!init_failed && !yaffs_InitialiseBlocks(dev))
 					init_failed = 1;
 
-				yaffs_InitialiseTnodes(dev);
-				yaffs_InitialiseObjects(dev);
+				yaffs_InitialiseTnodesAndObjects(dev);
 
 				if (!init_failed && !yaffs_CreateInitialDirectories(dev))
 					init_failed = 1;
 
-				if (!init_failed && !yaffs_ScanBackwards(dev))
+				if (!init_failed && !yaffs2_ScanBackwards(dev))
 					init_failed = 1;
 			}
-		} else if (!yaffs_Scan(dev))
+		} else if (!yaffs1_Scan(dev))
 				init_failed = 1;
 
 		yaffs_StripDeletedObjects(dev);
+		yaffs_FixHangingObjects(dev);
+		if(dev->param.emptyLostAndFound)
+			yaffs_EmptyLostAndFound(dev);
 	}
 
 	if (init_failed) {
@@ -7394,6 +5409,9 @@ int yaffs_GutsInitialise(yaffs_Device *d
 	yaffs_VerifyFreeChunks(dev);
 	yaffs_VerifyBlocks(dev);
 
+	/* Clean up any aborted checkpoint data */
+	if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
+		yaffs2_InvalidateCheckpoint(dev);
 
 	T(YAFFS_TRACE_TRACING,
 	  (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
@@ -7407,12 +5425,11 @@ void yaffs_Deinitialise(yaffs_Device *de
 		int i;
 
 		yaffs_DeinitialiseBlocks(dev);
-		yaffs_DeinitialiseTnodes(dev);
-		yaffs_DeinitialiseObjects(dev);
-		if (dev->nShortOpCaches > 0 &&
+		yaffs_DeinitialiseTnodesAndObjects(dev);
+		if (dev->param.nShortOpCaches > 0 &&
 		    dev->srCache) {
 
-			for (i = 0; i < dev->nShortOpCaches; i++) {
+			for (i = 0; i < dev->param.nShortOpCaches; i++) {
 				if (dev->srCache[i].data)
 					YFREE(dev->srCache[i].data);
 				dev->srCache[i].data = NULL;
@@ -7429,34 +5446,33 @@ void yaffs_Deinitialise(yaffs_Device *de
 
 		dev->isMounted = 0;
 
-		if (dev->deinitialiseNAND)
-			dev->deinitialiseNAND(dev);
+		if (dev->param.deinitialiseNAND)
+			dev->param.deinitialiseNAND(dev);
 	}
 }
 
-static int yaffs_CountFreeChunks(yaffs_Device *dev)
+int yaffs_CountFreeChunks(yaffs_Device *dev)
 {
-	int nFree;
+	int nFree=0;
 	int b;
 
 	yaffs_BlockInfo *blk;
 
-	for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
-			b++) {
-		blk = yaffs_GetBlockInfo(dev, b);
-
+	blk = dev->blockInfo;
+	for (b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) {
 		switch (blk->blockState) {
 		case YAFFS_BLOCK_STATE_EMPTY:
 		case YAFFS_BLOCK_STATE_ALLOCATING:
 		case YAFFS_BLOCK_STATE_COLLECTING:
 		case YAFFS_BLOCK_STATE_FULL:
 			nFree +=
-			    (dev->nChunksPerBlock - blk->pagesInUse +
+			    (dev->param.nChunksPerBlock - blk->pagesInUse +
 			     blk->softDeletions);
 			break;
 		default:
 			break;
 		}
+		blk++;
 	}
 
 	return nFree;
@@ -7481,21 +5497,19 @@ int yaffs_GetNumberOfFreeChunks(yaffs_De
 
 	/* Now count the number of dirty chunks in the cache and subtract those */
 
-	for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
+	for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
 		if (dev->srCache[i].dirty)
 			nDirtyCacheChunks++;
 	}
 
 	nFree -= nDirtyCacheChunks;
 
-	nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
+	nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
 
 	/* Now we figure out how much to reserve for the checkpoint and report that... */
-	blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
-	if (blocksForCheckpoint < 0)
-		blocksForCheckpoint = 0;
+	blocksForCheckpoint = yaffs2_CalcCheckpointBlocksRequired(dev);
 
-	nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
+	nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
 
 	if (nFree < 0)
 		nFree = 0;
@@ -7504,27 +5518,6 @@ int yaffs_GetNumberOfFreeChunks(yaffs_De
 
 }
 
-static int yaffs_freeVerificationFailures;
-
-static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
-{
-	int counted;
-	int difference;
-
-	if (yaffs_SkipVerification(dev))
-		return;
-
-	counted = yaffs_CountFreeChunks(dev);
-
-	difference = dev->nFreeChunks - counted;
-
-	if (difference) {
-		T(YAFFS_TRACE_ALWAYS,
-		  (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
-		   dev->nFreeChunks, counted, difference));
-		yaffs_freeVerificationFailures++;
-	}
-}
 
 /*---------------------------------------- YAFFS test code ----------------------*/
 
@@ -7532,7 +5525,7 @@ static void yaffs_VerifyFreeChunks(yaffs
 	do { \
 		if (sizeof(structure) != syze) { \
 			T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
-				name, syze, sizeof(structure))); \
+				name, syze, (int) sizeof(structure))); \
 			return YAFFS_FAIL; \
 		} \
 	} while (0)
@@ -7542,9 +5535,8 @@ static int yaffs_CheckStructures(void)
 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
-#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
-	yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode");
-#endif
+/*	yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
+
 #ifndef CONFIG_YAFFS_WINCE
 	yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
 #endif
--- a/fs/yaffs2/yaffs_guts.h
+++ b/fs/yaffs2/yaffs_guts.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -16,8 +16,9 @@
 #ifndef __YAFFS_GUTS_H__
 #define __YAFFS_GUTS_H__
 
-#include "devextras.h"
 #include "yportenv.h"
+#include "devextras.h"
+#include "yaffs_list.h"
 
 #define YAFFS_OK	1
 #define YAFFS_FAIL  0
@@ -52,7 +53,6 @@
 
 #define YAFFS_MAX_CHUNK_ID		0x000FFFFF
 
-#define YAFFS_UNUSED_OBJECT_ID		0x0003FFFF
 
 #define YAFFS_ALLOCATION_NOBJECTS	100
 #define YAFFS_ALLOCATION_NTNODES	100
@@ -62,8 +62,9 @@
 
 
 #define YAFFS_OBJECT_SPACE		0x40000
+#define YAFFS_MAX_OBJECT_ID		(YAFFS_OBJECT_SPACE -1)
 
-#define YAFFS_CHECKPOINT_VERSION 	3
+#define YAFFS_CHECKPOINT_VERSION 	4
 
 #ifdef CONFIG_YAFFS_UNICODE
 #define YAFFS_MAX_NAME_LENGTH		127
@@ -81,12 +82,11 @@
 #define YAFFS_OBJECTID_UNLINKED		3
 #define YAFFS_OBJECTID_DELETED		4
 
-/* Sseudo object ids for checkpointing */
+/* Pseudo object ids for checkpointing */
 #define YAFFS_OBJECTID_SB_HEADER	0x10
 #define YAFFS_OBJECTID_CHECKPOINT_DATA	0x20
 #define YAFFS_SEQUENCE_CHECKPOINT_DATA  0x21
 
-/* */
 
 #define YAFFS_MAX_SHORT_OP_CACHES	20
 
@@ -119,11 +119,7 @@ typedef struct {
 	int dirty;
 	int nBytes;		/* Only valid if the cache is dirty */
 	int locked;		/* Can't push out or flush while locked. */
-#ifdef CONFIG_YAFFS_YAFFS2
 	__u8 *data;
-#else
-	__u8 data[YAFFS_BYTES_PER_CHUNK];
-#endif
 } yaffs_ChunkCache;
 
 
@@ -234,6 +230,8 @@ typedef enum {
 	YAFFS_BLOCK_STATE_UNKNOWN = 0,
 
 	YAFFS_BLOCK_STATE_SCANNING,
+        /* Being scanned */
+
 	YAFFS_BLOCK_STATE_NEEDS_SCANNING,
 	/* The block might have something on it (ie it is allocating or full, perhaps empty)
 	 * but it needs to be scanned to determine its true state.
@@ -249,21 +247,23 @@ typedef enum {
 	/* This block is partially allocated.
 	 * At least one page holds valid data.
 	 * This is the one currently being used for page
-	 * allocation. Should never be more than one of these
+	 * allocation. Should never be more than one of these.
+         * If a block is only partially allocated at mount it is treated as full.
 	 */
 
 	YAFFS_BLOCK_STATE_FULL,
 	/* All the pages in this block have been allocated.
+         * If a block was only partially allocated when mounted we treat
+         * it as fully allocated.
 	 */
 
 	YAFFS_BLOCK_STATE_DIRTY,
-	/* All pages have been allocated and deleted.
+	/* The block was full and now all chunks have been deleted.
 	 * Erase me, reuse me.
 	 */
 
 	YAFFS_BLOCK_STATE_CHECKPOINT,
-	/* This block is assigned to holding checkpoint data.
-	 */
+	/* This block is assigned to holding checkpoint data. */
 
 	YAFFS_BLOCK_STATE_COLLECTING,
 	/* This block is being garbage collected */
@@ -351,23 +351,12 @@ typedef struct {
 /*--------------------------- Tnode -------------------------- */
 
 union yaffs_Tnode_union {
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-	union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL + 1];
-#else
 	union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];
-#endif
-/*	__u16 level0[YAFFS_NTNODES_LEVEL0]; */
 
 };
 
 typedef union yaffs_Tnode_union yaffs_Tnode;
 
-struct yaffs_TnodeList_struct {
-	struct yaffs_TnodeList_struct *next;
-	yaffs_Tnode *tnodes;
-};
-
-typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
 
 /*------------------------  Object -----------------------------*/
 /* An object can be one of:
@@ -387,6 +376,7 @@ typedef struct {
 
 typedef struct {
 	struct ylist_head children;     /* list of child links */
+	struct ylist_head dirty;	/* Entry for list of dirty directories */
 } yaffs_DirectoryStructure;
 
 typedef struct {
@@ -405,6 +395,8 @@ typedef union {
 	yaffs_HardLinkStructure hardLinkVariant;
 } yaffs_ObjectVariant;
 
+
+
 struct yaffs_ObjectStruct {
 	__u8 deleted:1;		/* This should only apply to unlinked files. */
 	__u8 softDeleted:1;	/* it has also been soft deleted */
@@ -424,6 +416,10 @@ struct yaffs_ObjectStruct {
 				 * until the inode is released.
 				 */
 	__u8 beingCreated:1;	/* This object is still being created so skip some checks. */
+	__u8 isShadowed:1;	/* This object is shadowed on the way to being renamed. */
+
+	__u8 xattrKnown:1;	/* We know if this has object has xattribs or not. */
+	__u8 hasXattr:1;	/* This object has xattribs. Valid if xattrKnown. */
 
 	__u8 serial;		/* serial number of chunk in NAND. Cached here */
 	__u16 sum;		/* sum of the name to speed searching */
@@ -452,10 +448,6 @@ struct yaffs_ObjectStruct {
 	YCHAR shortName[YAFFS_SHORT_NAME_LENGTH + 1];
 #endif
 
-#ifndef __KERNEL__
-	__u32 inUse;
-#endif
-
 #ifdef CONFIG_YAFFS_WINCE
 	__u32 win_ctime[2];
 	__u32 win_mtime[2];
@@ -470,10 +462,7 @@ struct yaffs_ObjectStruct {
 
 	__u32 yst_rdev;
 
-#ifdef __KERNEL__
-	struct inode *myInode;
-
-#endif
+	void *myInode;
 
 	yaffs_ObjectType variantType;
 
@@ -483,13 +472,6 @@ struct yaffs_ObjectStruct {
 
 typedef struct yaffs_ObjectStruct yaffs_Object;
 
-struct yaffs_ObjectList_struct {
-	yaffs_Object *objects;
-	struct yaffs_ObjectList_struct *next;
-};
-
-typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
-
 typedef struct {
 	struct ylist_head list;
 	int count;
@@ -531,12 +513,18 @@ typedef struct {
 
 /*----------------- Device ---------------------------------*/
 
-struct yaffs_DeviceStruct {
-	struct ylist_head devList;
-	const char *name;
 
-	/* Entry parameters set up way early. Yaffs sets up the rest.*/
-	int nDataBytesPerChunk;	/* Should be a power of 2 >= 512 */
+struct yaffs_DeviceParamStruct {
+	const YCHAR *name;
+
+	/*
+         * Entry parameters set up way early. Yaffs sets up the rest.
+         * The structure should be zeroed out before use so that unused
+         * and defualt values are zero.
+         */
+
+	int inbandTags;          /* Use unband tags */
+	__u32 totalBytesPerChunk; /* Should be >= 512, does not need to be a power of 2 */
 	int nChunksPerBlock;	/* does not need to be a power of 2 */
 	int spareBytesPerChunk;	/* spare area size */
 	int startBlock;		/* Start block we're allowed to use */
@@ -545,24 +533,24 @@ struct yaffs_DeviceStruct {
 				/* reserved blocks on NOR and RAM. */
 
 
-	/* Stuff used by the shared space checkpointing mechanism */
-	/* If this value is zero, then this mechanism is disabled */
-
-/*	int nCheckpointReservedBlocks; */ /* Blocks to reserve for checkpoint data */
-
-
 	int nShortOpCaches;	/* If <= 0, then short op caching is disabled, else
-				 * the number of short op caches (don't use too many)
+				 * the number of short op caches (don't use too many).
+                                 * 10 to 20 is a good bet.
 				 */
+	int useNANDECC;		/* Flag to decide whether or not to use NANDECC on data (yaffs1) */
+	int noTagsECC;		/* Flag to decide whether or not to do ECC on packed tags (yaffs2) */ 
 
-	int useHeaderFileSize;	/* Flag to determine if we should use file sizes from the header */
+	int isYaffs2;           /* Use yaffs2 mode on this device */
 
-	int useNANDECC;		/* Flag to decide whether or not to use NANDECC */
+	int emptyLostAndFound;  /* Auto-empty lost+found directory on mount */
 
-	void *genericDevice;	/* Pointer to device context
-				 * On an mtd this holds the mtd pointer.
-				 */
-	void *superBlock;
+	int refreshPeriod;	/* How often we should check to do a block refresh */
+
+	/* Checkpoint control. Can be set before or after initialisation */
+	__u8 skipCheckpointRead;
+	__u8 skipCheckpointWrite;
+
+	int enableXattr;	/* Enable xattribs */
 
 	/* NAND access functions (Must be set before calling YAFFS)*/
 
@@ -589,58 +577,68 @@ struct yaffs_DeviceStruct {
 			       yaffs_BlockState *state, __u32 *sequenceNumber);
 #endif
 
-	int isYaffs2;
-
 	/* The removeObjectCallback function must be supplied by OS flavours that
-	 * need it. The Linux kernel does not use this, but yaffs direct does use
-	 * it to implement the faster readdir
+	 * need it.
+         * yaffs direct uses it to implement the faster readdir.
+         * Linux uses it to protect the directory during unlocking.
 	 */
 	void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj);
 
-	/* Callback to mark the superblock dirsty */
-	void (*markSuperBlockDirty)(void *superblock);
+	/* Callback to mark the superblock dirty */
+	void (*markSuperBlockDirty)(struct yaffs_DeviceStruct *dev);
+	
+	/*  Callback to control garbage collection. */
+	unsigned (*gcControl)(struct yaffs_DeviceStruct *dev);
 
+        /* Debug control flags. Don't use unless you know what you're doing */
+	int useHeaderFileSize;	/* Flag to determine if we should use file sizes from the header */
+	int disableLazyLoad;	/* Disable lazy loading on this device */
 	int wideTnodesDisabled; /* Set to disable wide tnodes */
+	int disableSoftDelete;  /* yaffs 1 only: Set to disable the use of softdeletion. */
+	
+	int deferDirectoryUpdate; /* Set to defer directory updates */
+
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	int autoUnicode;
+#endif
+	int alwaysCheckErased; /* Force chunk erased check always on */
+};
 
-	YCHAR *pathDividers;	/* String of legal path dividers */
+typedef struct yaffs_DeviceParamStruct yaffs_DeviceParam;
 
+struct yaffs_DeviceStruct {
+	struct yaffs_DeviceParamStruct param;
 
-	/* End of stuff that must be set before initialisation. */
+        /* Context storage. Holds extra OS specific data for this device */
 
-	/* Checkpoint control. Can be set before or after initialisation */
-	__u8 skipCheckpointRead;
-	__u8 skipCheckpointWrite;
+	void *osContext;
+	void *driverContext;
+
+	struct ylist_head devList;
 
 	/* Runtime parameters. Set up by YAFFS. */
+	int nDataBytesPerChunk;	
 
-	__u16 chunkGroupBits;	/* 0 for devices <= 32MB. else log2(nchunks) - 16 */
+        /* Non-wide tnode stuff */
+	__u16 chunkGroupBits;	/* Number of bits that need to be resolved if
+                                 * the tnodes are not wide enough.
+                                 */
 	__u16 chunkGroupSize;	/* == 2^^chunkGroupBits */
 
 	/* Stuff to support wide tnodes */
 	__u32 tnodeWidth;
 	__u32 tnodeMask;
+	__u32 tnodeSize;
 
 	/* Stuff for figuring out file offset to chunk conversions */
 	__u32 chunkShift; /* Shift value */
 	__u32 chunkDiv;   /* Divisor after shifting: 1 for power-of-2 sizes */
 	__u32 chunkMask;  /* Mask to use for power-of-2 case */
 
-	/* Stuff to handle inband tags */
-	int inbandTags;
-	__u32 totalBytesPerChunk;
-
-#ifdef __KERNEL__
-
-	struct semaphore sem;	/* Semaphore for waiting on erasure.*/
-	struct semaphore grossLock;	/* Gross locking semaphore */
-	__u8 *spareBuffer;	/* For mtdif2 use. Don't know the size of the buffer
-				 * at compile time so we have to allocate it.
-				 */
-	void (*putSuperFunc) (struct super_block *sb);
-#endif
 
-	int isMounted;
 
+	int isMounted;
+	int readOnly;
 	int isCheckpointed;
 
 
@@ -682,51 +680,31 @@ struct yaffs_DeviceStruct {
 	__u32 allocationPage;
 	int allocationBlockFinder;	/* Used to search for next allocation block */
 
-	/* Runtime state */
-	int nTnodesCreated;
-	yaffs_Tnode *freeTnodes;
-	int nFreeTnodes;
-	yaffs_TnodeList *allocatedTnodeList;
-
-	int isDoingGC;
-	int gcBlock;
-	int gcChunk;
-
-	int nObjectsCreated;
-	yaffs_Object *freeObjects;
-	int nFreeObjects;
+	/* Object and Tnode memory management */
+	void *allocator;
+	int nObjects;
+	int nTnodes;
 
 	int nHardLinks;
 
-	yaffs_ObjectList *allocatedObjectList;
-
 	yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
+	__u32 bucketFinder;
 
 	int nFreeChunks;
 
-	int currentDirtyChecker;	/* Used to find current dirtiest block */
-
+	/* Garbage collection control */
 	__u32 *gcCleanupList;	/* objects to delete at the end of a GC. */
-	int nonAggressiveSkip;	/* GC state/mode */
+	__u32 nCleanups;
 
-	/* Statistcs */
-	int nPageWrites;
-	int nPageReads;
-	int nBlockErasures;
-	int nErasureFailures;
-	int nGCCopies;
-	int garbageCollections;
-	int passiveGarbageCollections;
-	int nRetriedWrites;
-	int nRetiredBlocks;
-	int eccFixed;
-	int eccUnfixed;
-	int tagsEccFixed;
-	int tagsEccUnfixed;
-	int nDeletions;
-	int nUnmarkedDeletions;
-
-	int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
+	unsigned hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
+	unsigned gcDisable;
+	unsigned gcBlockFinder;
+	unsigned gcDirtiest;
+	unsigned gcPagesInUse;
+	unsigned gcNotDone;
+	unsigned gcBlock;
+	unsigned gcChunk;
+	unsigned gcSkip;
 
 	/* Special directories */
 	yaffs_Object *rootDir;
@@ -743,8 +721,6 @@ struct yaffs_DeviceStruct {
 	yaffs_ChunkCache *srCache;
 	int srLastUse;
 
-	int cacheHits;
-
 	/* Stuff for background deletion and unlinked files.*/
 	yaffs_Object *unlinkedDir;	/* Directory where unlinked and deleted files live. */
 	yaffs_Object *deletedDir;	/* Directory where deleted objects are sent to disappear. */
@@ -753,7 +729,6 @@ struct yaffs_DeviceStruct {
 	int nUnlinkedFiles;		/* Count of unlinked files. */
 	int nBackgroundDeletions;	/* Count of background deletions. */
 
-
 	/* Temporary buffer management */
 	yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
 	int maxTemp;
@@ -764,6 +739,36 @@ struct yaffs_DeviceStruct {
 	/* yaffs2 runtime stuff */
 	unsigned sequenceNumber;	/* Sequence number of currently allocating block */
 	unsigned oldestDirtySequence;
+	unsigned oldestDirtyBlock;
+
+	/* Block refreshing */
+	int refreshSkip;	/* A skip down counter. Refresh happens when this gets to zero. */
+
+	/* Dirty directory handling */
+	struct ylist_head dirtyDirectories; /* List of dirty directories */
+
+
+	/* Statistcs */
+	__u32 nPageWrites;
+	__u32 nPageReads;
+	__u32 nBlockErasures;
+	__u32 nErasureFailures;
+	__u32 nGCCopies;
+	__u32 allGCs;
+	__u32 passiveGCs;
+	__u32 oldestDirtyGCs;
+	__u32 nGCBlocks;
+	__u32 backgroundGCs;
+	__u32 nRetriedWrites;
+	__u32 nRetiredBlocks;
+	__u32 eccFixed;
+	__u32 eccUnfixed;
+	__u32 tagsEccFixed;
+	__u32 tagsEccUnfixed;
+	__u32 nDeletions;
+	__u32 nUnmarkedDeletions;
+	__u32 refreshCount;
+	__u32 cacheHits;
 
 };
 
@@ -796,7 +801,6 @@ typedef struct {
 
 	/* yaffs2 runtime stuff */
 	unsigned sequenceNumber;	/* Sequence number of currently allocating block */
-	unsigned oldestDirtySequence;
 
 } yaffs_CheckpointDevice;
 
@@ -809,6 +813,23 @@ typedef struct {
 } yaffs_CheckpointValidity;
 
 
+struct yaffs_ShadowFixerStruct {
+	int objectId;
+	int shadowedId;
+	struct yaffs_ShadowFixerStruct *next;
+};
+
+/* Structure for doing xattr modifications */
+typedef struct {
+	int set; /* If 0 then this is a deletion */
+	const YCHAR *name;
+	const void *data;
+	int size;
+	int flags;
+	int result;
+}yaffs_XAttrMod;
+
+
 /*----------------------- YAFFS Functions -----------------------*/
 
 int yaffs_GutsInitialise(yaffs_Device *dev);
@@ -840,7 +861,8 @@ int yaffs_ResizeFile(yaffs_Object *obj,
 
 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
 				__u32 mode, __u32 uid, __u32 gid);
-int yaffs_FlushFile(yaffs_Object *obj, int updateTime);
+
+int yaffs_FlushFile(yaffs_Object *obj, int updateTime, int dataSync);
 
 /* Flushing and checkpointing */
 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
@@ -873,6 +895,12 @@ YCHAR *yaffs_GetSymlinkAlias(yaffs_Objec
 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
 				 __u32 mode, __u32 uid, __u32 gid, __u32 rdev);
 
+
+int yaffs_SetXAttribute(yaffs_Object *obj, const YCHAR *name, const void * value, int size, int flags);
+int yaffs_GetXAttribute(yaffs_Object *obj, const YCHAR *name, void *value, int size);
+int yaffs_ListXAttributes(yaffs_Object *obj, char *buffer, int size);
+int yaffs_RemoveXAttribute(yaffs_Object *obj, const YCHAR *name);
+
 /* Special directories */
 yaffs_Object *yaffs_Root(yaffs_Device *dev);
 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev);
@@ -882,18 +910,18 @@ yaffs_Object *yaffs_LostNFound(yaffs_Dev
 void yfsd_WinFileTimeNow(__u32 target[2]);
 #endif
 
-#ifdef __KERNEL__
-
 void yaffs_HandleDeferedFree(yaffs_Object *obj);
-#endif
+
+void yaffs_UpdateDirtyDirectories(yaffs_Device *dev);
+
+int yaffs_BackgroundGarbageCollect(yaffs_Device *dev, unsigned urgency);
 
 /* Debug dump  */
 int yaffs_DumpObject(yaffs_Object *obj);
 
 void yaffs_GutsTest(yaffs_Device *dev);
 
-/* A few useful functions */
-void yaffs_InitialiseTags(yaffs_ExtendedTags *tags);
+/* A few useful functions to be used within the core files*/
 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn);
 int yaffs_CheckFF(__u8 *buffer, int nBytes);
 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi);
@@ -901,4 +929,41 @@ void yaffs_HandleChunkError(yaffs_Device
 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo);
 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo);
 
+yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
+					        int number,
+					        yaffs_ObjectType type);
+int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
+			        int chunkInNAND, int inScan);
+void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name);
+void yaffs_SetObjectNameFromOH(yaffs_Object *obj, const yaffs_ObjectHeader *oh);
+void yaffs_AddObjectToDirectory(yaffs_Object *directory,
+					yaffs_Object *obj);
+YCHAR *yaffs_CloneString(const YCHAR *str);
+void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
+void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo);
+int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
+				int force, int isShrink, int shadows,
+                                yaffs_XAttrMod *xop);
+void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
+				int backwardScanning);
+int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks);
+yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev);
+yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
+					yaffs_FileStructure *fStruct,
+					__u32 chunkId,
+					yaffs_Tnode *passedTn);
+
+int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+			int nBytes, int writeThrough);
+void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize);
+void yaffs_SkipRestOfBlock(yaffs_Device *dev);
+
+int yaffs_CountFreeChunks(yaffs_Device *dev);
+
+yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
+				yaffs_FileStructure *fStruct,
+				__u32 chunkId);
+
+__u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
+
 #endif
--- a/fs/yaffs2/yaffsinterface.h
+++ b/fs/yaffs2/yaffsinterface.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- /dev/null
+++ b/fs/yaffs2/yaffs_linux_allocator.c
@@ -0,0 +1,200 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * Note: Tis code is currently unused. Being checked in in case it becomes useful.
+ */
+
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+#include "yaffs_linux.h"
+/*
+ * Start out with the same allocator as yaffs direct.
+ * Todo: Change to Linux slab allocator.
+ */
+
+
+
+#define NAMELEN  20
+struct yaffs_AllocatorStruct {
+	char tnode_name[NAMELEN+1];
+	char object_name[NAMELEN+1];
+	struct kmem_cache *tnode_cache;
+	struct kmem_cache *object_cache;
+};
+
+typedef struct yaffs_AllocatorStruct yaffs_Allocator;
+
+int mount_id;
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+
+	T(YAFFS_TRACE_ALLOCATE,(TSTR("Deinitialising yaffs allocator\n")));
+
+	if(allocator){
+		if(allocator->tnode_cache){
+			kmem_cache_destroy(allocator->tnode_cache);
+			allocator->tnode_cache = NULL;
+		} else {
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("NULL tnode cache\n")));
+			YBUG();
+		}
+
+		if(allocator->object_cache){
+			kmem_cache_destroy(allocator->object_cache);
+			allocator->object_cache = NULL;
+		} else {
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("NULL object cache\n")));
+			YBUG();
+		}
+
+		YFREE(allocator);
+
+	} else {
+		T(YAFFS_TRACE_ALWAYS,
+			(TSTR("Deinitialising NULL allocator\n")));
+		YBUG();
+	}
+	dev->allocator = NULL;
+}
+
+
+static void fake_ctor0(void *data){data = data;}
+static void fake_ctor1(void *data){data = data;}
+static void fake_ctor2(void *data){data = data;}
+static void fake_ctor3(void *data){data = data;}
+static void fake_ctor4(void *data){data = data;}
+static void fake_ctor5(void *data){data = data;}
+static void fake_ctor6(void *data){data = data;}
+static void fake_ctor7(void *data){data = data;}
+static void fake_ctor8(void *data){data = data;}
+static void fake_ctor9(void *data){data = data;}
+
+static void (*fake_ctor_list[10]) (void *) = {
+	fake_ctor0,
+	fake_ctor1,
+	fake_ctor2,
+	fake_ctor3,
+	fake_ctor4,
+	fake_ctor5,
+	fake_ctor6,
+	fake_ctor7,
+	fake_ctor8,
+	fake_ctor9,
+};
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator;
+	unsigned mount_id = yaffs_DeviceToLC(dev)->mount_id;
+
+	T(YAFFS_TRACE_ALLOCATE,(TSTR("Initialising yaffs allocator\n")));
+
+	if(dev->allocator)
+		YBUG();
+	else if(mount_id >= 10){
+		T(YAFFS_TRACE_ALWAYS,(TSTR("Bad mount_id %u\n"),mount_id));
+	} else {
+		 allocator = YMALLOC(sizeof(yaffs_Allocator));
+		 memset(allocator,0,sizeof(yaffs_Allocator));
+		 dev->allocator = allocator;
+
+		if(!dev->allocator){
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("yaffs allocator creation failed\n")));
+			YBUG();
+			return;
+
+		}
+
+		sprintf(allocator->tnode_name,"yaffs_t_%u",mount_id);
+		sprintf(allocator->object_name,"yaffs_o_%u",mount_id);
+
+		allocator->tnode_cache =
+			kmem_cache_create(allocator->tnode_name,
+				dev->tnodeSize,
+				0, 0,
+				fake_ctor_list[mount_id]);
+		if(allocator->tnode_cache)
+			T(YAFFS_TRACE_ALLOCATE,
+				(TSTR("tnode cache \"%s\" %p\n"),
+				allocator->tnode_name,allocator->tnode_cache));
+		else {
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("yaffs cache creation failed\n")));
+			YBUG();
+		}
+
+
+		allocator->object_cache = 
+			kmem_cache_create(allocator->object_name,
+				sizeof(yaffs_Object),
+				0, 0,
+				fake_ctor_list[mount_id]);
+
+		if(allocator->object_cache)
+			T(YAFFS_TRACE_ALLOCATE,
+				(TSTR("object cache \"%s\" %p\n"),
+				allocator->object_name,allocator->object_cache));
+
+		else {
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("yaffs cache creation failed\n")));
+			YBUG();
+		}
+	} 
+}
+
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	if(!allocator || !allocator->tnode_cache){
+		YBUG();
+		return NULL;
+	}
+	return kmem_cache_alloc(allocator->tnode_cache, GFP_NOFS);
+}
+
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	kmem_cache_free(allocator->tnode_cache,tn);
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	if(!allocator){
+		YBUG();
+		return NULL;
+	}
+	if(!allocator->object_cache){
+		YBUG();
+		return NULL;
+	}
+	return kmem_cache_alloc(allocator->object_cache, GFP_NOFS);
+}
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	kmem_cache_free(allocator->object_cache,obj);
+}
--- /dev/null
+++ b/fs/yaffs2/yaffs_linux.h
@@ -0,0 +1,43 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_LINUX_H__
+#define __YAFFS_LINUX_H__
+
+#include "devextras.h"
+#include "yportenv.h"
+
+struct yaffs_LinuxContext {
+	struct ylist_head	contextList; /* List of these we have mounted */
+	struct yaffs_DeviceStruct *dev;
+	struct super_block * superBlock;
+	struct task_struct *bgThread; /* Background thread for this device */
+	int bgRunning;
+        struct semaphore grossLock;     /* Gross locking semaphore */
+	__u8 *spareBuffer;      /* For mtdif2 use. Don't know the size of the buffer
+				 * at compile time so we have to allocate it.
+				 */
+	struct ylist_head searchContexts;
+	void (*putSuperFunc)(struct super_block *sb);
+
+	struct task_struct *readdirProcess;
+	unsigned mount_id;
+};
+
+#define yaffs_DeviceToLC(dev) ((struct yaffs_LinuxContext *)((dev)->osContext))
+#define yaffs_DeviceToMtd(dev) ((struct mtd_info *)((dev)->driverContext))
+
+#endif
+
--- /dev/null
+++ b/fs/yaffs2/yaffs_list.h
@@ -0,0 +1,127 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * This file is just holds extra declarations of macros that would normally
+ * be providesd in the Linux kernel. These macros have been written from
+ * scratch but are functionally equivalent to the Linux ones.
+ *
+ */
+
+#ifndef __YAFFS_LIST_H__
+#define __YAFFS_LIST_H__
+
+
+#include "yportenv.h"
+
+/*
+ * This is a simple doubly linked list implementation that matches the
+ * way the Linux kernel doubly linked list implementation works.
+ */
+
+struct ylist_head {
+	struct ylist_head *next; /* next in chain */
+	struct ylist_head *prev; /* previous in chain */
+};
+
+
+/* Initialise a static list */
+#define YLIST_HEAD(name) \
+struct ylist_head name = { &(name), &(name)}
+
+
+
+/* Initialise a list head to an empty list */
+#define YINIT_LIST_HEAD(p) \
+do { \
+	(p)->next = (p);\
+	(p)->prev = (p); \
+} while (0)
+
+
+/* Add an element to a list */
+static Y_INLINE void ylist_add(struct ylist_head *newEntry,
+				struct ylist_head *list)
+{
+	struct ylist_head *listNext = list->next;
+
+	list->next = newEntry;
+	newEntry->prev = list;
+	newEntry->next = listNext;
+	listNext->prev = newEntry;
+
+}
+
+static Y_INLINE void ylist_add_tail(struct ylist_head *newEntry,
+				 struct ylist_head *list)
+{
+	struct ylist_head *listPrev = list->prev;
+
+	list->prev = newEntry;
+	newEntry->next = list;
+	newEntry->prev = listPrev;
+	listPrev->next = newEntry;
+
+}
+
+
+/* Take an element out of its current list, with or without
+ * reinitialising the links.of the entry*/
+static Y_INLINE void ylist_del(struct ylist_head *entry)
+{
+	struct ylist_head *listNext = entry->next;
+	struct ylist_head *listPrev = entry->prev;
+
+	listNext->prev = listPrev;
+	listPrev->next = listNext;
+
+}
+
+static Y_INLINE void ylist_del_init(struct ylist_head *entry)
+{
+	ylist_del(entry);
+	entry->next = entry->prev = entry;
+}
+
+
+/* Test if the list is empty */
+static Y_INLINE int ylist_empty(struct ylist_head *entry)
+{
+	return (entry->next == entry);
+}
+
+
+/* ylist_entry takes a pointer to a list entry and offsets it to that
+ * we can find a pointer to the object it is embedded in.
+ */
+
+
+#define ylist_entry(entry, type, member) \
+	((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
+
+
+/* ylist_for_each and list_for_each_safe  iterate over lists.
+ * ylist_for_each_safe uses temporary storage to make the list delete safe
+ */
+
+#define ylist_for_each(itervar, list) \
+	for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
+
+#define ylist_for_each_safe(itervar, saveVar, list) \
+	for (itervar = (list)->next, saveVar = (list)->next->next; \
+		itervar != (list); itervar = saveVar, saveVar = saveVar->next)
+
+
+#endif
--- a/fs/yaffs2/yaffs_mtdif1.c
+++ b/fs/yaffs2/yaffs_mtdif1.c
@@ -2,7 +2,7 @@
  * YAFFS: Yet another FFS. A NAND-flash specific file system.
  * yaffs_mtdif1.c  NAND mtd interface functions for small-page NAND.
  *
- * Copyright (C) 2002 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * This program is free software; you can redistribute it and/or modify
@@ -24,9 +24,11 @@
  */
 
 #include "yportenv.h"
+#include "yaffs_trace.h"
 #include "yaffs_guts.h"
 #include "yaffs_packedtags1.h"
 #include "yaffs_tagscompat.h"	/* for yaffs_CalcTagsECC */
+#include "yaffs_linux.h"
 
 #include "linux/kernel.h"
 #include "linux/version.h"
@@ -36,8 +38,6 @@
 /* Don't compile this module if we don't have MTD's mtd_oob_ops interface */
 #if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
 
-const char *yaffs_mtdif1_c_version = "$Id: yaffs_mtdif1.c,v 1.10 2009-03-09 07:41:10 charles Exp $";
-
 #ifndef CONFIG_YAFFS_9BYTE_TAGS
 # define YTAG1_SIZE 8
 #else
@@ -91,7 +91,7 @@ static struct nand_ecclayout nand_oob_16
 int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
 	int chunkInNAND, const __u8 *data, const yaffs_ExtendedTags *etags)
 {
-	struct mtd_info *mtd = dev->genericDevice;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int chunkBytes = dev->nDataBytesPerChunk;
 	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
 	struct mtd_oob_ops ops;
@@ -102,8 +102,6 @@ int nandmtd1_WriteChunkWithTagsToNAND(ya
 	compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
 	compile_time_assertion(sizeof(yaffs_Tags) == 8);
 
-	dev->nPageWrites++;
-
 	yaffs_PackTags1(&pt1, etags);
 	yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
 
@@ -137,9 +135,9 @@ int nandmtd1_WriteChunkWithTagsToNAND(ya
 
 	retval = mtd->write_oob(mtd, addr, &ops);
 	if (retval) {
-		yaffs_trace(YAFFS_TRACE_MTD,
-			"write_oob failed, chunk %d, mtd error %d\n",
-			chunkInNAND, retval);
+		T(YAFFS_TRACE_MTD,
+			(TSTR("write_oob failed, chunk %d, mtd error %d"TENDSTR),
+			chunkInNAND, retval));
 	}
 	return retval ? YAFFS_FAIL : YAFFS_OK;
 }
@@ -171,7 +169,7 @@ static int rettags(yaffs_ExtendedTags *e
 int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
 	int chunkInNAND, __u8 *data, yaffs_ExtendedTags *etags)
 {
-	struct mtd_info *mtd = dev->genericDevice;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int chunkBytes = dev->nDataBytesPerChunk;
 	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
 	int eccres = YAFFS_ECC_RESULT_NO_ERROR;
@@ -180,8 +178,6 @@ int nandmtd1_ReadChunkWithTagsFromNAND(y
 	int retval;
 	int deleted;
 
-	dev->nPageReads++;
-
 	memset(&ops, 0, sizeof(ops));
 	ops.mode = MTD_OOB_AUTO;
 	ops.len = (data) ? chunkBytes : 0;
@@ -200,9 +196,9 @@ int nandmtd1_ReadChunkWithTagsFromNAND(y
 	 */
 	retval = mtd->read_oob(mtd, addr, &ops);
 	if (retval) {
-		yaffs_trace(YAFFS_TRACE_MTD,
-			"read_oob failed, chunk %d, mtd error %d\n",
-			chunkInNAND, retval);
+		T(YAFFS_TRACE_MTD,
+			(TSTR("read_oob failed, chunk %d, mtd error %d"TENDSTR),
+			chunkInNAND, retval));
 	}
 
 	switch (retval) {
@@ -284,11 +280,11 @@ int nandmtd1_ReadChunkWithTagsFromNAND(y
  */
 int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 {
-	struct mtd_info *mtd = dev->genericDevice;
-	int blocksize = dev->nChunksPerBlock * dev->nDataBytesPerChunk;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
+	int blocksize = dev->param.nChunksPerBlock * dev->nDataBytesPerChunk;
 	int retval;
 
-	yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad\n", blockNo);
+	T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("marking block %d bad"TENDSTR), blockNo));
 
 	retval = mtd->block_markbad(mtd, (loff_t)blocksize * blockNo);
 	return (retval) ? YAFFS_FAIL : YAFFS_OK;
@@ -305,9 +301,9 @@ static int nandmtd1_TestPrerequists(stru
 	int oobavail = mtd->ecclayout->oobavail;
 
 	if (oobavail < YTAG1_SIZE) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"mtd device has only %d bytes for tags, need %d\n",
-			oobavail, YTAG1_SIZE);
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("mtd device has only %d bytes for tags, need %d"TENDSTR),
+			oobavail, YTAG1_SIZE));
 		return YAFFS_FAIL;
 	}
 	return YAFFS_OK;
@@ -325,8 +321,8 @@ static int nandmtd1_TestPrerequists(stru
 int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
 	yaffs_BlockState *pState, __u32 *pSequenceNumber)
 {
-	struct mtd_info *mtd = dev->genericDevice;
-	int chunkNo = blockNo * dev->nChunksPerBlock;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
+	int chunkNo = blockNo * dev->param.nChunksPerBlock;
 	loff_t addr = (loff_t)chunkNo * dev->nDataBytesPerChunk;
 	yaffs_ExtendedTags etags;
 	int state = YAFFS_BLOCK_STATE_DEAD;
@@ -342,8 +338,8 @@ int nandmtd1_QueryNANDBlock(struct yaffs
 	retval = nandmtd1_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &etags);
 	etags.blockBad = (mtd->block_isbad)(mtd, addr);
 	if (etags.blockBad) {
-		yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
-			"block %d is marked bad\n", blockNo);
+		T(YAFFS_TRACE_BAD_BLOCKS,
+			(TSTR("block %d is marked bad"TENDSTR), blockNo));
 		state = YAFFS_BLOCK_STATE_DEAD;
 	} else if (etags.eccResult != YAFFS_ECC_RESULT_NO_ERROR) {
 		/* bad tags, need to look more closely */
--- a/fs/yaffs2/yaffs_mtdif1-compat.c
+++ /dev/null
@@ -1,434 +0,0 @@
-From ian@brightstareng.com Fri May 18 15:06:49 2007
-From ian@brightstareng.com Fri May 18 15:08:21 2007
-Received: from 206.173.66.57.ptr.us.xo.net ([206.173.66.57] helo=zebra.brightstareng.com)
-	by apollo.linkchoose.co.uk with esmtp (Exim 4.60)
-	(envelope-from <ian@brightstareng.com>)
-	id 1Hp380-00011e-T6
-	for david.goodenough@linkchoose.co.uk; Fri, 18 May 2007 15:08:21 +0100
-Received: from localhost (localhost.localdomain [127.0.0.1])
-	by zebra.brightstareng.com (Postfix) with ESMTP
-	id 4819F28C004; Fri, 18 May 2007 10:07:49 -0400 (EDT)
-Received: from zebra.brightstareng.com ([127.0.0.1])
- by localhost (zebra [127.0.0.1]) (amavisd-new, port 10024) with ESMTP
- id 05328-06; Fri, 18 May 2007 10:07:16 -0400 (EDT)
-Received: from pippin (unknown [192.168.1.25])
-	by zebra.brightstareng.com (Postfix) with ESMTP
-	id 8BEF528C1BC; Fri, 18 May 2007 10:06:53 -0400 (EDT)
-From: Ian McDonnell <ian@brightstareng.com>
-To: David Goodenough <david.goodenough@linkchoose.co.uk>
-Subject: Re: something tested this time -- yaffs_mtdif1-compat.c
-Date: Fri, 18 May 2007 10:06:49 -0400
-User-Agent: KMail/1.9.1
-References: <200705142207.06909.ian@brightstareng.com> <200705171131.53536.ian@brightstareng.com> <200705181334.32166.david.goodenough@linkchoose.co.uk>
-In-Reply-To: <200705181334.32166.david.goodenough@linkchoose.co.uk>
-Cc: Andrea Conti <alyf@alyf.net>,
- Charles Manning <manningc2@actrix.gen.nz>
-MIME-Version: 1.0
-Content-Type: Multipart/Mixed;
-  boundary="Boundary-00=_5LbTGmt62YoutxM"
-Message-Id: <200705181006.49860.ian@brightstareng.com>
-X-Virus-Scanned: by amavisd-new at brightstareng.com
-Status: R
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-X-KMail-EncryptionState:
-X-KMail-SignatureState:
-X-KMail-MDN-Sent:
-
---Boundary-00=_5LbTGmt62YoutxM
-Content-Type: text/plain;
-  charset="iso-8859-15"
-Content-Transfer-Encoding: 7bit
-Content-Disposition: inline
-
-David, Andrea,
-
-On Friday 18 May 2007 08:34, you wrote:
-> Yea team.  With this fix in place (I put it in the wrong place
-> at first) I can now mount and ls the Yaffs partition without
-> an error messages!
-
-Good news!
-
-Attached is a newer yaffs_mtdif1.c with a bandaid to help the
-2.6.18 and 2.6.19 versions of MTD not trip on the oob read.
-See the LINUX_VERSION_CODE conditional in
-nandmtd1_ReadChunkWithTagsFromNAND.
-
--imcd
-
---Boundary-00=_5LbTGmt62YoutxM
-Content-Type: text/x-csrc;
-  charset="iso-8859-15";
-  name="yaffs_mtdif1.c"
-Content-Transfer-Encoding: 7bit
-Content-Disposition: attachment;
-	filename="yaffs_mtdif1.c"
-
-/*
- * YAFFS: Yet another FFS. A NAND-flash specific file system.
- * yaffs_mtdif1.c  NAND mtd interface functions for small-page NAND.
- *
- * Copyright (C) 2002 Aleph One Ltd.
- *   for Toby Churchill Ltd and Brightstar Engineering
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- * This module provides the interface between yaffs_nand.c and the
- * MTD API.  This version is used when the MTD interface supports the
- * 'mtd_oob_ops' style calls to read_oob and write_oob, circa 2.6.17,
- * and we have small-page NAND device.
- *
- * These functions are invoked via function pointers in yaffs_nand.c.
- * This replaces functionality provided by functions in yaffs_mtdif.c
- * and the yaffs_TagsCompatability functions in yaffs_tagscompat.c that are
- * called in yaffs_mtdif.c when the function pointers are NULL.
- * We assume the MTD layer is performing ECC (useNANDECC is true).
- */
-
-#include "yportenv.h"
-#include "yaffs_guts.h"
-#include "yaffs_packedtags1.h"
-#include "yaffs_tagscompat.h"	// for yaffs_CalcTagsECC
-
-#include "linux/kernel.h"
-#include "linux/version.h"
-#include "linux/types.h"
-#include "linux/mtd/mtd.h"
-
-/* Don't compile this module if we don't have MTD's mtd_oob_ops interface */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-
-const char *yaffs_mtdif1_c_version = "$Id$";
-
-#ifndef CONFIG_YAFFS_9BYTE_TAGS
-# define YTAG1_SIZE 8
-#else
-# define YTAG1_SIZE 9
-#endif
-
-#if 0
-/* Use the following nand_ecclayout with MTD when using
- * CONFIG_YAFFS_9BYTE_TAGS and the older on-NAND tags layout.
- * If you have existing Yaffs images and the byte order differs from this,
- * adjust 'oobfree' to match your existing Yaffs data.
- *
- * This nand_ecclayout scatters/gathers to/from the old-yaffs layout with the
- * pageStatus byte (at NAND spare offset 4) scattered/gathered from/to
- * the 9th byte.
- *
- * Old-style on-NAND format: T0,T1,T2,T3,P,B,T4,T5,E0,E1,E2,T6,T7,E3,E4,E5
- * We have/need PackedTags1 plus pageStatus: T0,T1,T2,T3,T4,T5,T6,T7,P
- * where Tn are the tag bytes, En are MTD's ECC bytes, P is the pageStatus
- * byte and B is the small-page bad-block indicator byte.
- */
-static struct nand_ecclayout nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = { 8, 9, 10, 13, 14, 15 },
-	.oobavail = 9,
-	.oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
-};
-#endif
-
-/* Write a chunk (page) of data to NAND.
- *
- * Caller always provides ExtendedTags data which are converted to a more
- * compact (packed) form for storage in NAND.  A mini-ECC runs over the
- * contents of the tags meta-data; used to valid the tags when read.
- *
- *  - Pack ExtendedTags to PackedTags1 form
- *  - Compute mini-ECC for PackedTags1
- *  - Write data and packed tags to NAND.
- *
- * Note: Due to the use of the PackedTags1 meta-data which does not include
- * a full sequence number (as found in the larger PackedTags2 form) it is
- * necessary for Yaffs to re-write a chunk/page (just once) to mark it as
- * discarded and dirty.  This is not ideal: newer NAND parts are supposed
- * to be written just once.  When Yaffs performs this operation, this
- * function is called with a NULL data pointer -- calling MTD write_oob
- * without data is valid usage (2.6.17).
- *
- * Any underlying MTD error results in YAFFS_FAIL.
- * Returns YAFFS_OK or YAFFS_FAIL.
- */
-int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
-	int chunkInNAND, const __u8 * data, const yaffs_ExtendedTags * etags)
-{
-	struct mtd_info * mtd = dev->genericDevice;
-	int chunkBytes = dev->nDataBytesPerChunk;
-	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
-	struct mtd_oob_ops ops;
-	yaffs_PackedTags1 pt1;
-	int retval;
-
-	/* we assume that PackedTags1 and yaffs_Tags are compatible */
-	compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
-	compile_time_assertion(sizeof(yaffs_Tags) == 8);
-
-	yaffs_PackTags1(&pt1, etags);
-	yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
-
-	/* When deleting a chunk, the upper layer provides only skeletal
-	 * etags, one with chunkDeleted set.  However, we need to update the
-	 * tags, not erase them completely.  So we use the NAND write property
-	 * that only zeroed-bits stick and set tag bytes to all-ones and
-	 * zero just the (not) deleted bit.
-	 */
-#ifndef CONFIG_YAFFS_9BYTE_TAGS
-	if (etags->chunkDeleted) {
-		memset(&pt1, 0xff, 8);
-		/* clear delete status bit to indicate deleted */
-		pt1.deleted = 0;
-	}
-#else
-	((__u8 *)&pt1)[8] = 0xff;
-	if (etags->chunkDeleted) {
-		memset(&pt1, 0xff, 8);
-		/* zero pageStatus byte to indicate deleted */
-		((__u8 *)&pt1)[8] = 0;
-	}
-#endif
-
-	memset(&ops, 0, sizeof(ops));
-	ops.mode = MTD_OOB_AUTO;
-	ops.len = (data) ? chunkBytes : 0;
-	ops.ooblen = YTAG1_SIZE;
-	ops.datbuf = (__u8 *)data;
-	ops.oobbuf = (__u8 *)&pt1;
-
-	retval = mtd->write_oob(mtd, addr, &ops);
-	if (retval) {
-		yaffs_trace(YAFFS_TRACE_MTD,
-			"write_oob failed, chunk %d, mtd error %d\n",
-			chunkInNAND, retval);
-	}
-	return retval ? YAFFS_FAIL : YAFFS_OK;
-}
-
-/* Return with empty ExtendedTags but add eccResult.
- */
-static int rettags(yaffs_ExtendedTags * etags, int eccResult, int retval)
-{
-	if (etags) {
-		memset(etags, 0, sizeof(*etags));
-		etags->eccResult = eccResult;
-	}
-	return retval;
-}
-
-/* Read a chunk (page) from NAND.
- *
- * Caller expects ExtendedTags data to be usable even on error; that is,
- * all members except eccResult and blockBad are zeroed.
- *
- *  - Check ECC results for data (if applicable)
- *  - Check for blank/erased block (return empty ExtendedTags if blank)
- *  - Check the PackedTags1 mini-ECC (correct if necessary/possible)
- *  - Convert PackedTags1 to ExtendedTags
- *  - Update eccResult and blockBad members to refect state.
- *
- * Returns YAFFS_OK or YAFFS_FAIL.
- */
-int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
-	int chunkInNAND, __u8 * data, yaffs_ExtendedTags * etags)
-{
-	struct mtd_info * mtd = dev->genericDevice;
-	int chunkBytes = dev->nDataBytesPerChunk;
-	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
-	int eccres = YAFFS_ECC_RESULT_NO_ERROR;
-	struct mtd_oob_ops ops;
-	yaffs_PackedTags1 pt1;
-	int retval;
-	int deleted;
-
-	memset(&ops, 0, sizeof(ops));
-	ops.mode = MTD_OOB_AUTO;
-	ops.len = (data) ? chunkBytes : 0;
-	ops.ooblen = YTAG1_SIZE;
-	ops.datbuf = data;
-	ops.oobbuf = (__u8 *)&pt1;
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20))
-	/* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
-	 * help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
-	 */
-	ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
-#endif
-	/* Read page and oob using MTD.
-	 * Check status and determine ECC result.
-	 */
-	retval = mtd->read_oob(mtd, addr, &ops);
-	if (retval) {
-		yaffs_trace(YAFFS_TRACE_MTD,
-			"read_oob failed, chunk %d, mtd error %d\n",
-			chunkInNAND, retval);
-	}
-
-	switch (retval) {
-	case 0:
-		/* no error */
-		break;
-
-	case -EUCLEAN:
-		/* MTD's ECC fixed the data */
-		eccres = YAFFS_ECC_RESULT_FIXED;
-		dev->eccFixed++;
-		break;
-
-	case -EBADMSG:
-		/* MTD's ECC could not fix the data */
-		dev->eccUnfixed++;
-		/* fall into... */
-	default:
-		rettags(etags, YAFFS_ECC_RESULT_UNFIXED, 0);
-		etags->blockBad = (mtd->block_isbad)(mtd, addr);
-		return YAFFS_FAIL;
-	}
-
-	/* Check for a blank/erased chunk.
-	 */
-	if (yaffs_CheckFF((__u8 *)&pt1, 8)) {
-		/* when blank, upper layers want eccResult to be <= NO_ERROR */
-		return rettags(etags, YAFFS_ECC_RESULT_NO_ERROR, YAFFS_OK);
-	}
-
-#ifndef CONFIG_YAFFS_9BYTE_TAGS
-	/* Read deleted status (bit) then return it to it's non-deleted
-	 * state before performing tags mini-ECC check. pt1.deleted is
-	 * inverted.
-	 */
-	deleted = !pt1.deleted;
-	pt1.deleted = 1;
-#else
-	(void) deleted; /* not used */
-#endif
-
-	/* Check the packed tags mini-ECC and correct if necessary/possible.
-	 */
-	retval = yaffs_CheckECCOnTags((yaffs_Tags *)&pt1);
-	switch (retval) {
-	case 0:
-		/* no tags error, use MTD result */
-		break;
-	case 1:
-		/* recovered tags-ECC error */
-		dev->tagsEccFixed++;
-		eccres = YAFFS_ECC_RESULT_FIXED;
-		break;
-	default:
-		/* unrecovered tags-ECC error */
-		dev->tagsEccUnfixed++;
-		return rettags(etags, YAFFS_ECC_RESULT_UNFIXED, YAFFS_FAIL);
-	}
-
-	/* Unpack the tags to extended form and set ECC result.
-	 * [set shouldBeFF just to keep yaffs_UnpackTags1 happy]
-	 */
-	pt1.shouldBeFF = 0xFFFFFFFF;
-	yaffs_UnpackTags1(etags, &pt1);
-	etags->eccResult = eccres;
-
-	/* Set deleted state.
-	 */
-#ifndef CONFIG_YAFFS_9BYTE_TAGS
-	etags->chunkDeleted = deleted;
-#else
-	etags->chunkDeleted = (yaffs_CountBits(((__u8 *)&pt1)[8]) < 7);
-#endif
-	return YAFFS_OK;
-}
-
-/* Mark a block bad.
- *
- * This is a persistant state.
- * Use of this function should be rare.
- *
- * Returns YAFFS_OK or YAFFS_FAIL.
- */
-int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
-{
-	struct mtd_info * mtd = dev->genericDevice;
-	int blocksize = dev->nChunksPerBlock * dev->nDataBytesPerChunk;
-	int retval;
-
-	yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", blockNo);
-
-	retval = mtd->block_markbad(mtd, (loff_t)blocksize * blockNo);
-	return (retval) ? YAFFS_FAIL : YAFFS_OK;
-}
-
-/* Check any MTD prerequists.
- *
- * Returns YAFFS_OK or YAFFS_FAIL.
- */
-static int nandmtd1_TestPrerequists(struct mtd_info * mtd)
-{
-	/* 2.6.18 has mtd->ecclayout->oobavail */
-	/* 2.6.21 has mtd->ecclayout->oobavail and mtd->oobavail */
-	int oobavail = mtd->ecclayout->oobavail;
-
-	if (oobavail < YTAG1_SIZE) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"mtd device has only %d bytes for tags, need %d",
-			oobavail, YTAG1_SIZE);
-		return YAFFS_FAIL;
-	}
-	return YAFFS_OK;
-}
-
-/* Query for the current state of a specific block.
- *
- * Examine the tags of the first chunk of the block and return the state:
- *  - YAFFS_BLOCK_STATE_DEAD, the block is marked bad
- *  - YAFFS_BLOCK_STATE_NEEDS_SCANNING, the block is in use
- *  - YAFFS_BLOCK_STATE_EMPTY, the block is clean
- *
- * Always returns YAFFS_OK.
- */
-int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
-	yaffs_BlockState * pState, int *pSequenceNumber)
-{
-	struct mtd_info * mtd = dev->genericDevice;
-	int chunkNo = blockNo * dev->nChunksPerBlock;
-	yaffs_ExtendedTags etags;
-	int state = YAFFS_BLOCK_STATE_DEAD;
-	int seqnum = 0;
-	int retval;
-
-	/* We don't yet have a good place to test for MTD config prerequists.
-	 * Do it here as we are called during the initial scan.
-	 */
-	if (nandmtd1_TestPrerequists(mtd) != YAFFS_OK) {
-		return YAFFS_FAIL;
-	}
-
-	retval = nandmtd1_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &etags);
-	if (etags.blockBad) {
-		yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
-			"block %d is marked bad", blockNo);
-		state = YAFFS_BLOCK_STATE_DEAD;
-	}
-	else if (etags.chunkUsed) {
-		state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
-		seqnum = etags.sequenceNumber;
-	}
-	else {
-		state = YAFFS_BLOCK_STATE_EMPTY;
-	}
-
-	*pState = state;
-	*pSequenceNumber = seqnum;
-
-	/* query always succeeds */
-	return YAFFS_OK;
-}
-
-#endif /*KERNEL_VERSION*/
-
---Boundary-00=_5LbTGmt62YoutxM--
-
-
-
--- a/fs/yaffs2/yaffs_mtdif1.h
+++ b/fs/yaffs2/yaffs_mtdif1.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * This program is free software; you can redistribute it and/or modify
--- a/fs/yaffs2/yaffs_mtdif2.c
+++ b/fs/yaffs2/yaffs_mtdif2.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -13,11 +13,8 @@
 
 /* mtd interface for YAFFS2 */
 
-const char *yaffs_mtdif2_c_version =
-	"$Id: yaffs_mtdif2.c,v 1.23 2009-03-06 17:20:53 wookey Exp $";
-
 #include "yportenv.h"
-
+#include "yaffs_trace.h"
 
 #include "yaffs_mtdif2.h"
 
@@ -27,6 +24,8 @@ const char *yaffs_mtdif2_c_version =
 
 #include "yaffs_packedtags2.h"
 
+#include "yaffs_linux.h"
+
 /* NB For use with inband tags....
  * We assume that the data buffer is of size totalBytersPerChunk so that we can also
  * use it to load the tags.
@@ -35,7 +34,7 @@ int nandmtd2_WriteChunkWithTagsToNAND(ya
 				      const __u8 *data,
 				      const yaffs_ExtendedTags *tags)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 #if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
 	struct mtd_oob_ops ops;
 #else
@@ -47,13 +46,16 @@ int nandmtd2_WriteChunkWithTagsToNAND(ya
 
 	yaffs_PackedTags2 pt;
 
+	int packed_tags_size = dev->param.noTagsECC ? sizeof(pt.t) : sizeof(pt);
+	void * packed_tags_ptr = dev->param.noTagsECC ? (void *) &pt.t : (void *)&pt;
+
 	T(YAFFS_TRACE_MTD,
 	  (TSTR
 	   ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
 	    TENDSTR), chunkInNAND, data, tags));
 
 
-	addr  = ((loff_t) chunkInNAND) * dev->totalBytesPerChunk;
+	addr  = ((loff_t) chunkInNAND) * dev->param.totalBytesPerChunk;
 
 	/* For yaffs2 writing there must be both data and tags.
 	 * If we're using inband tags, then the tags are stuffed into
@@ -61,30 +63,30 @@ int nandmtd2_WriteChunkWithTagsToNAND(ya
 	 */
 	if (!data || !tags)
 		BUG();
-	else if (dev->inbandTags) {
+	else if (dev->param.inbandTags) {
 		yaffs_PackedTags2TagsPart *pt2tp;
 		pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->nDataBytesPerChunk);
 		yaffs_PackTags2TagsPart(pt2tp, tags);
 	} else
-		yaffs_PackTags2(&pt, tags);
+		yaffs_PackTags2(&pt, tags, !dev->param.noTagsECC);
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 	ops.mode = MTD_OOB_AUTO;
-	ops.ooblen = (dev->inbandTags) ? 0 : sizeof(pt);
-	ops.len = dev->totalBytesPerChunk;
+	ops.ooblen = (dev->param.inbandTags) ? 0 : packed_tags_size;
+	ops.len = dev->param.totalBytesPerChunk;
 	ops.ooboffs = 0;
 	ops.datbuf = (__u8 *)data;
-	ops.oobbuf = (dev->inbandTags) ? NULL : (void *)&pt;
+	ops.oobbuf = (dev->param.inbandTags) ? NULL : packed_tags_ptr;
 	retval = mtd->write_oob(mtd, addr, &ops);
 
 #else
-	if (!dev->inbandTags) {
+	if (!dev->param.inbandTags) {
 		retval =
 		    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-				   &dummy, data, (__u8 *) &pt, NULL);
+				   &dummy, data, (__u8 *) packed_tags_ptr, NULL);
 	} else {
 		retval =
-		    mtd->write(mtd, addr, dev->totalBytesPerChunk, &dummy,
+		    mtd->write(mtd, addr, dev->param.totalBytesPerChunk, &dummy,
 			       data);
 	}
 #endif
@@ -98,7 +100,7 @@ int nandmtd2_WriteChunkWithTagsToNAND(ya
 int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev, int chunkInNAND,
 				       __u8 *data, yaffs_ExtendedTags *tags)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 #if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
 	struct mtd_oob_ops ops;
 #endif
@@ -106,16 +108,19 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 	int retval = 0;
 	int localData = 0;
 
-	loff_t addr = ((loff_t) chunkInNAND) * dev->totalBytesPerChunk;
+	loff_t addr = ((loff_t) chunkInNAND) * dev->param.totalBytesPerChunk;
 
 	yaffs_PackedTags2 pt;
 
+	int packed_tags_size = dev->param.noTagsECC ? sizeof(pt.t) : sizeof(pt);
+	void * packed_tags_ptr = dev->param.noTagsECC ? (void *) &pt.t: (void *)&pt;
+
 	T(YAFFS_TRACE_MTD,
 	  (TSTR
 	   ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
 	    TENDSTR), chunkInNAND, data, tags));
 
-	if (dev->inbandTags) {
+	if (dev->param.inbandTags) {
 
 		if (!data) {
 			localData = 1;
@@ -127,20 +132,20 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-	if (dev->inbandTags || (data && !tags))
-		retval = mtd->read(mtd, addr, dev->totalBytesPerChunk,
+	if (dev->param.inbandTags || (data && !tags))
+		retval = mtd->read(mtd, addr, dev->param.totalBytesPerChunk,
 				&dummy, data);
 	else if (tags) {
 		ops.mode = MTD_OOB_AUTO;
-		ops.ooblen = sizeof(pt);
-		ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
+		ops.ooblen = packed_tags_size;
+		ops.len = data ? dev->nDataBytesPerChunk : packed_tags_size;
 		ops.ooboffs = 0;
 		ops.datbuf = data;
-		ops.oobbuf = dev->spareBuffer;
+		ops.oobbuf = yaffs_DeviceToLC(dev)->spareBuffer;
 		retval = mtd->read_oob(mtd, addr, &ops);
 	}
 #else
-	if (!dev->inbandTags && data && tags) {
+	if (!dev->param.inbandTags && data && tags) {
 
 		retval = mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 					  &dummy, data, dev->spareBuffer,
@@ -150,7 +155,7 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 			retval =
 			    mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 				      data);
-		if (!dev->inbandTags && tags)
+		if (!dev->param.inbandTags && tags)
 			retval =
 			    mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
 					  dev->spareBuffer);
@@ -158,7 +163,7 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 #endif
 
 
-	if (dev->inbandTags) {
+	if (dev->param.inbandTags) {
 		if (tags) {
 			yaffs_PackedTags2TagsPart *pt2tp;
 			pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
@@ -166,16 +171,22 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 		}
 	} else {
 		if (tags) {
-			memcpy(&pt, dev->spareBuffer, sizeof(pt));
-			yaffs_UnpackTags2(tags, &pt);
+			memcpy(packed_tags_ptr, yaffs_DeviceToLC(dev)->spareBuffer, packed_tags_size);
+			yaffs_UnpackTags2(tags, &pt, !dev->param.noTagsECC);
 		}
 	}
 
 	if (localData)
 		yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 
-	if (tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
+	if (tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR) {
 		tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
+		dev->eccUnfixed++;
+	}
+	if(tags && retval == -EUCLEAN && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR) {
+		tags->eccResult = YAFFS_ECC_RESULT_FIXED;
+		dev->eccFixed++;
+	}
 	if (retval == 0)
 		return YAFFS_OK;
 	else
@@ -184,15 +195,15 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 
 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int retval;
 	T(YAFFS_TRACE_MTD,
 	  (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
 
 	retval =
 	    mtd->block_markbad(mtd,
-			       blockNo * dev->nChunksPerBlock *
-			       dev->totalBytesPerChunk);
+			       blockNo * dev->param.nChunksPerBlock *
+			       dev->param.totalBytesPerChunk);
 
 	if (retval == 0)
 		return YAFFS_OK;
@@ -204,15 +215,15 @@ int nandmtd2_MarkNANDBlockBad(struct yaf
 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
 			    yaffs_BlockState *state, __u32 *sequenceNumber)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int retval;
 
 	T(YAFFS_TRACE_MTD,
 	  (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
 	retval =
 	    mtd->block_isbad(mtd,
-			     blockNo * dev->nChunksPerBlock *
-			     dev->totalBytesPerChunk);
+			     blockNo * dev->param.nChunksPerBlock *
+			     dev->param.totalBytesPerChunk);
 
 	if (retval) {
 		T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
@@ -223,7 +234,7 @@ int nandmtd2_QueryNANDBlock(struct yaffs
 		yaffs_ExtendedTags t;
 		nandmtd2_ReadChunkWithTagsFromNAND(dev,
 						   blockNo *
-						   dev->nChunksPerBlock, NULL,
+						   dev->param.nChunksPerBlock, NULL,
 						   &t);
 
 		if (t.chunkUsed) {
--- a/fs/yaffs2/yaffs_mtdif2.h
+++ b/fs/yaffs2/yaffs_mtdif2.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_mtdif.c
+++ b/fs/yaffs2/yaffs_mtdif.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,9 +11,6 @@
  * published by the Free Software Foundation.
  */
 
-const char *yaffs_mtdif_c_version =
-	"$Id: yaffs_mtdif.c,v 1.22 2009-03-06 17:20:51 wookey Exp $";
-
 #include "yportenv.h"
 
 
@@ -24,208 +21,26 @@ const char *yaffs_mtdif_c_version =
 #include "linux/time.h"
 #include "linux/mtd/nand.h"
 
-#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 18))
-static struct nand_oobinfo yaffs_oobinfo = {
-	.useecc = 1,
-	.eccbytes = 6,
-	.eccpos = {8, 9, 10, 13, 14, 15}
-};
-
-static struct nand_oobinfo yaffs_noeccinfo = {
-	.useecc = 0,
-};
-#endif
-
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
-{
-	oob[0] = spare->tagByte0;
-	oob[1] = spare->tagByte1;
-	oob[2] = spare->tagByte2;
-	oob[3] = spare->tagByte3;
-	oob[4] = spare->tagByte4;
-	oob[5] = spare->tagByte5 & 0x3f;
-	oob[5] |= spare->blockStatus == 'Y' ? 0 : 0x80;
-	oob[5] |= spare->pageStatus == 0 ? 0 : 0x40;
-	oob[6] = spare->tagByte6;
-	oob[7] = spare->tagByte7;
-}
-
-static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
-{
-	struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
-	spare->tagByte0 = oob[0];
-	spare->tagByte1 = oob[1];
-	spare->tagByte2 = oob[2];
-	spare->tagByte3 = oob[3];
-	spare->tagByte4 = oob[4];
-	spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
-	spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
-	spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
-	spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
-	spare->tagByte6 = oob[6];
-	spare->tagByte7 = oob[7];
-	spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
-
-	nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
-}
-#endif
-
-int nandmtd_WriteChunkToNAND(yaffs_Device *dev, int chunkInNAND,
-			     const __u8 *data, const yaffs_Spare *spare)
-{
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-	struct mtd_oob_ops ops;
-#endif
-	size_t dummy;
-	int retval = 0;
-
-	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-	__u8 spareAsBytes[8]; /* OOB */
-
-	if (data && !spare)
-		retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
-				&dummy, data);
-	else if (spare) {
-		if (dev->useNANDECC) {
-			translate_spare2oob(spare, spareAsBytes);
-			ops.mode = MTD_OOB_AUTO;
-			ops.ooblen = 8; /* temp hack */
-		} else {
-			ops.mode = MTD_OOB_RAW;
-			ops.ooblen = YAFFS_BYTES_PER_SPARE;
-		}
-		ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
-		ops.datbuf = (u8 *)data;
-		ops.ooboffs = 0;
-		ops.oobbuf = spareAsBytes;
-		retval = mtd->write_oob(mtd, addr, &ops);
-	}
-#else
-	__u8 *spareAsBytes = (__u8 *) spare;
-
-	if (data && spare) {
-		if (dev->useNANDECC)
-			retval =
-			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					   &dummy, data, spareAsBytes,
-					   &yaffs_oobinfo);
-		else
-			retval =
-			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					   &dummy, data, spareAsBytes,
-					   &yaffs_noeccinfo);
-	} else {
-		if (data)
-			retval =
-			    mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
-				       data);
-		if (spare)
-			retval =
-			    mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
-					   &dummy, spareAsBytes);
-	}
-#endif
-
-	if (retval == 0)
-		return YAFFS_OK;
-	else
-		return YAFFS_FAIL;
-}
-
-int nandmtd_ReadChunkFromNAND(yaffs_Device *dev, int chunkInNAND, __u8 *data,
-			      yaffs_Spare *spare)
-{
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-	struct mtd_oob_ops ops;
-#endif
-	size_t dummy;
-	int retval = 0;
-
-	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-	__u8 spareAsBytes[8]; /* OOB */
-
-	if (data && !spare)
-		retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
-				&dummy, data);
-	else if (spare) {
-		if (dev->useNANDECC) {
-			ops.mode = MTD_OOB_AUTO;
-			ops.ooblen = 8; /* temp hack */
-		} else {
-			ops.mode = MTD_OOB_RAW;
-			ops.ooblen = YAFFS_BYTES_PER_SPARE;
-		}
-		ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
-		ops.datbuf = data;
-		ops.ooboffs = 0;
-		ops.oobbuf = spareAsBytes;
-		retval = mtd->read_oob(mtd, addr, &ops);
-		if (dev->useNANDECC)
-			translate_oob2spare(spare, spareAsBytes);
-	}
-#else
-	__u8 *spareAsBytes = (__u8 *) spare;
-
-	if (data && spare) {
-		if (dev->useNANDECC) {
-			/* Careful, this call adds 2 ints */
-			/* to the end of the spare data.  Calling function */
-			/* should allocate enough memory for spare, */
-			/* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
-			retval =
-			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					  &dummy, data, spareAsBytes,
-					  &yaffs_oobinfo);
-		} else {
-			retval =
-			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
-					  &dummy, data, spareAsBytes,
-					  &yaffs_noeccinfo);
-		}
-	} else {
-		if (data)
-			retval =
-			    mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
-				      data);
-		if (spare)
-			retval =
-			    mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
-					  &dummy, spareAsBytes);
-	}
-#endif
-
-	if (retval == 0)
-		return YAFFS_OK;
-	else
-		return YAFFS_FAIL;
-}
+#include "yaffs_linux.h"
 
 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 {
-	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	__u32 addr =
-	    ((loff_t) blockNumber) * dev->nDataBytesPerChunk
-		* dev->nChunksPerBlock;
+	    ((loff_t) blockNumber) * dev->param.totalBytesPerChunk
+		* dev->param.nChunksPerBlock;
 	struct erase_info ei;
+	
 	int retval = 0;
 
 	ei.mtd = mtd;
 	ei.addr = addr;
-	ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
+	ei.len = dev->param.totalBytesPerChunk * dev->param.nChunksPerBlock;
 	ei.time = 1000;
 	ei.retries = 2;
 	ei.callback = NULL;
 	ei.priv = (u_long) dev;
 
-	/* Todo finish off the ei if required */
-
-	sema_init(&dev->sem, 0);
-
 	retval = mtd->erase(mtd, &ei);
 
 	if (retval == 0)
--- a/fs/yaffs2/yaffs_mtdif.h
+++ b/fs/yaffs2/yaffs_mtdif.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -22,11 +22,6 @@
 extern struct nand_oobinfo yaffs_oobinfo;
 extern struct nand_oobinfo yaffs_noeccinfo;
 #endif
-
-int nandmtd_WriteChunkToNAND(yaffs_Device *dev, int chunkInNAND,
-			const __u8 *data, const yaffs_Spare *spare);
-int nandmtd_ReadChunkFromNAND(yaffs_Device *dev, int chunkInNAND, __u8 *data,
-			yaffs_Spare *spare);
 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
 int nandmtd_InitialiseNAND(yaffs_Device *dev);
 #endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.c
@@ -0,0 +1,197 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This simple implementation of a name-value store assumes a small number of values and fits
+ * into a small finite buffer.
+ *
+ * Each attribute is stored as a record:
+ *  sizeof(int) bytes   record size.
+ *  strnlen+1 bytes name null terminated.
+ *  nbytes    value.
+ *  ----------
+ *  total size  stored in record size 
+ *
+ * This code has not been tested with unicode yet.
+ */
+
+
+#include "yaffs_nameval.h"
+
+#include "yportenv.h"
+ 
+static int nval_find(const char *xb, int xb_size, const YCHAR *name,
+		int *exist_size)
+{
+	int pos=0;
+	int size;
+
+	memcpy(&size,xb,sizeof(int));
+	while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
+		if(yaffs_strncmp((YCHAR *)(xb+pos+sizeof(int)),name,size) == 0){
+			if(exist_size)
+				*exist_size = size;
+			return pos;
+		}
+		pos += size;
+		if(pos < xb_size -sizeof(int))
+			memcpy(&size,xb + pos,sizeof(int));
+		else
+			size = 0;
+	}
+	if(exist_size)
+		*exist_size = 0;
+	return -1;
+}
+
+static int nval_used(const char *xb, int xb_size)
+{
+	int pos=0;
+	int size;
+
+	memcpy(&size,xb + pos,sizeof(int));
+	while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
+		pos += size;
+		if(pos < xb_size -sizeof(int))
+			memcpy(&size,xb + pos,sizeof(int));
+		else
+			size = 0;
+	}
+	return pos;
+}
+
+int nval_del(char *xb, int xb_size, const YCHAR *name)
+{
+	int pos  = nval_find(xb, xb_size, name, NULL);
+	int size;
+	
+	if(pos >= 0 && pos < xb_size){
+		/* Find size, shift rest over this record, then zero out the rest of buffer */
+		memcpy(&size,xb+pos,sizeof(int));
+		memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+		memset(xb + (xb_size - size),0,size);
+		return 0;
+	} else
+		return -ENODATA;
+}
+
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, int bsize, int flags)
+{
+	int pos;
+	int namelen = yaffs_strnlen(name,xb_size);
+	int reclen;
+	int size_exist = 0;
+	int space;
+	int start;
+
+	pos = nval_find(xb,xb_size,name, &size_exist);
+
+	if(flags & XATTR_CREATE && pos >= 0)
+		return -EEXIST;
+	if(flags & XATTR_REPLACE && pos < 0)
+		return -ENODATA;
+
+	start = nval_used(xb,xb_size);
+	space = xb_size - start + size_exist;
+
+	reclen = (sizeof(int) + namelen + 1 + bsize);
+
+	if(reclen > space)
+		return -ENOSPC;
+
+	if(pos >= 0){
+		nval_del(xb,xb_size,name);
+		start = nval_used(xb, xb_size);
+	}
+
+	pos = start;
+
+	memcpy(xb + pos,&reclen,sizeof(int));
+	pos +=sizeof(int);
+	yaffs_strncpy((YCHAR *)(xb + pos), name, reclen);
+	pos+= (namelen+1);
+	memcpy(xb + pos,buf,bsize);
+	return 0;
+}
+
+int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize)
+{
+	int pos = nval_find(xb,xb_size,name,NULL);
+	int size;
+	
+	if(pos >= 0 && pos< xb_size){
+		
+		memcpy(&size,xb +pos,sizeof(int));
+		pos+=sizeof(int); /* advance past record length */
+		size -= sizeof(int);
+
+		/* Advance over name string */
+		while(xb[pos] && size > 0 && pos < xb_size){
+			pos++;
+			size--;
+		}
+		/*Advance over NUL */
+		pos++;
+		size--;
+
+		if(size <= bsize){
+			memcpy(buf,xb + pos,size);
+			return size;
+		}
+		
+	}
+	if(pos >= 0)
+		return -ERANGE;
+	else
+		return -ENODATA;
+}
+
+int nval_list(const char *xb, int xb_size, char *buf, int bsize)
+{
+	int pos = 0;
+	int size;
+	int name_len;
+	int ncopied = 0;
+	int filled = 0;
+
+	memcpy(&size,xb + pos,sizeof(int));
+	while(size > sizeof(int) && size <= xb_size && (pos + size) < xb_size && !filled){
+		pos+= sizeof(int);
+		size-=sizeof(int);
+		name_len = yaffs_strnlen((YCHAR *)(xb + pos), size);
+		if(ncopied + name_len + 1 < bsize){
+			memcpy(buf,xb+pos,name_len * sizeof(YCHAR));
+			buf+= name_len;
+			*buf = '\0';
+			buf++;
+			if(sizeof(YCHAR) > 1){
+				*buf = '\0';
+				buf++;
+			}
+			ncopied += (name_len+1);
+		} else
+			filled = 1;
+		pos+=size;
+		if(pos < xb_size -sizeof(int))
+			memcpy(&size,xb + pos,sizeof(int));
+		else
+			size = 0;
+	}
+	return ncopied;
+}
+
+
+int nval_hasvalues(const char *xb, int xb_size)
+{
+	return nval_used(xb, xb_size) > 0;
+}
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.h
@@ -0,0 +1,25 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+int nval_del(char *xb, int xb_size, const YCHAR *name);
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, int bsize, int flags);
+int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize);
+int nval_list(const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(const char *xb, int xb_size);
+#endif
--- a/fs/yaffs2/yaffs_nand.c
+++ b/fs/yaffs2/yaffs_nand.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,9 +11,6 @@
  * published by the Free Software Foundation.
  */
 
-const char *yaffs_nand_c_version =
-	"$Id: yaffs_nand.c,v 1.10 2009-03-06 17:20:54 wookey Exp $";
-
 #include "yaffs_nand.h"
 #include "yaffs_tagscompat.h"
 #include "yaffs_tagsvalidity.h"
@@ -29,12 +26,14 @@ int yaffs_ReadChunkWithTagsFromNAND(yaff
 
 	int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
 
+	dev->nPageReads++;
+
 	/* If there are no tags provided, use local tags to get prioritised gc working */
 	if (!tags)
 		tags = &localTags;
 
-	if (dev->readChunkWithTagsFromNAND)
-		result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
+	if (dev->param.readChunkWithTagsFromNAND)
+		result = dev->param.readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
 						      tags);
 	else
 		result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
@@ -44,7 +43,8 @@ int yaffs_ReadChunkWithTagsFromNAND(yaff
 	if (tags &&
 	   tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR) {
 
-		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
+		yaffs_BlockInfo *bi;
+		bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->param.nChunksPerBlock);
 		yaffs_HandleChunkError(dev, bi);
 	}
 
@@ -56,6 +56,9 @@ int yaffs_WriteChunkWithTagsToNAND(yaffs
 						   const __u8 *buffer,
 						   yaffs_ExtendedTags *tags)
 {
+
+	dev->nPageWrites++;
+
 	chunkInNAND -= dev->chunkOffset;
 
 
@@ -75,8 +78,8 @@ int yaffs_WriteChunkWithTagsToNAND(yaffs
 		YBUG();
 	}
 
-	if (dev->writeChunkWithTagsToNAND)
-		return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
+	if (dev->param.writeChunkWithTagsToNAND)
+		return dev->param.writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
 						     tags);
 	else
 		return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
@@ -89,9 +92,9 @@ int yaffs_MarkBlockBad(yaffs_Device *dev
 {
 	blockNo -= dev->blockOffset;
 
-;
-	if (dev->markNANDBlockBad)
-		return dev->markNANDBlockBad(dev, blockNo);
+
+	if (dev->param.markNANDBlockBad)
+		return dev->param.markNANDBlockBad(dev, blockNo);
 	else
 		return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
 }
@@ -103,8 +106,8 @@ int yaffs_QueryInitialBlockState(yaffs_D
 {
 	blockNo -= dev->blockOffset;
 
-	if (dev->queryNANDBlock)
-		return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
+	if (dev->param.queryNANDBlock)
+		return dev->param.queryNANDBlock(dev, blockNo, state, sequenceNumber);
 	else
 		return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
 							     state,
@@ -119,16 +122,18 @@ int yaffs_EraseBlockInNAND(struct yaffs_
 
 	blockInNAND -= dev->blockOffset;
 
-
 	dev->nBlockErasures++;
-	result = dev->eraseBlockInNAND(dev, blockInNAND);
+
+	result = dev->param.eraseBlockInNAND(dev, blockInNAND);
 
 	return result;
 }
 
 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 {
-	return dev->initialiseNAND(dev);
+	if(dev->param.initialiseNAND)
+		return dev->param.initialiseNAND(dev);
+	return YAFFS_OK;
 }
 
 
--- a/fs/yaffs2/yaffs_nandemul2k.h
+++ b/fs/yaffs2/yaffs_nandemul2k.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_nand.h
+++ b/fs/yaffs2/yaffs_nand.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_packedtags1.c
+++ b/fs/yaffs2/yaffs_packedtags1.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_packedtags1.h
+++ b/fs/yaffs2/yaffs_packedtags1.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_packedtags2.c
+++ b/fs/yaffs2/yaffs_packedtags2.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -13,6 +13,7 @@
 
 #include "yaffs_packedtags2.h"
 #include "yportenv.h"
+#include "yaffs_trace.h"
 #include "yaffs_tagsvalidity.h"
 
 /* This code packs a set of extended tags into a binary structure for
@@ -96,17 +97,14 @@ void yaffs_PackTags2TagsPart(yaffs_Packe
 }
 
 
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t)
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t, int tagsECC)
 {
 	yaffs_PackTags2TagsPart(&pt->t, t);
 
-#ifndef YAFFS_IGNORE_TAGS_ECC
-	{
+	if(tagsECC)
 		yaffs_ECCCalculateOther((unsigned char *)&pt->t,
 					sizeof(yaffs_PackedTags2TagsPart),
 					&pt->ecc);
-	}
-#endif
 }
 
 
@@ -158,27 +156,24 @@ void yaffs_UnpackTags2TagsPart(yaffs_Ext
 }
 
 
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt, int tagsECC)
 {
 
 	yaffs_ECCResult eccResult = YAFFS_ECC_RESULT_NO_ERROR;
 
-	if (pt->t.sequenceNumber != 0xFFFFFFFF) {
-		/* Page is in use */
-#ifndef YAFFS_IGNORE_TAGS_ECC
-		{
-			yaffs_ECCOther ecc;
-			int result;
-			yaffs_ECCCalculateOther((unsigned char *)&pt->t,
-						sizeof
-						(yaffs_PackedTags2TagsPart),
-						&ecc);
-			result =
-			    yaffs_ECCCorrectOther((unsigned char *)&pt->t,
-						  sizeof
-						  (yaffs_PackedTags2TagsPart),
-						  &pt->ecc, &ecc);
-			switch (result) {
+	if (pt->t.sequenceNumber != 0xFFFFFFFF &&
+	    tagsECC){
+		/* Chunk is in use and we need to do ECC */
+		
+		yaffs_ECCOther ecc;
+		int result;
+		yaffs_ECCCalculateOther((unsigned char *)&pt->t,
+					sizeof(yaffs_PackedTags2TagsPart),
+					&ecc);
+		result = yaffs_ECCCorrectOther((unsigned char *)&pt->t,
+						sizeof(yaffs_PackedTags2TagsPart),
+						&pt->ecc, &ecc);
+		switch (result) {
 			case 0:
 				eccResult = YAFFS_ECC_RESULT_NO_ERROR;
 				break;
@@ -190,9 +185,7 @@ void yaffs_UnpackTags2(yaffs_ExtendedTag
 				break;
 			default:
 				eccResult = YAFFS_ECC_RESULT_UNKNOWN;
-			}
 		}
-#endif
 	}
 
 	yaffs_UnpackTags2TagsPart(t, &pt->t);
@@ -201,6 +194,5 @@ void yaffs_UnpackTags2(yaffs_ExtendedTag
 
 	yaffs_DumpPackedTags2(pt);
 	yaffs_DumpTags2(t);
-
 }
 
--- a/fs/yaffs2/yaffs_packedtags2.h
+++ b/fs/yaffs2/yaffs_packedtags2.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -34,8 +34,8 @@ typedef struct {
 } yaffs_PackedTags2;
 
 /* Full packed tags with ECC, used for oob tags */
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t);
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt);
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t, int tagsECC);
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt, int tagsECC);
 
 /* Only the tags part (no ECC for use with inband tags */
 void yaffs_PackTags2TagsPart(yaffs_PackedTags2TagsPart *pt, const yaffs_ExtendedTags *t);
--- a/fs/yaffs2/yaffs_qsort.h
+++ b/fs/yaffs2/yaffs_qsort.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -17,7 +17,18 @@
 #ifndef __YAFFS_QSORT_H__
 #define __YAFFS_QSORT_H__
 
+#ifdef __KERNEL__
+#include <linux/sort.h>
+
+extern void yaffs_qsort(void *const base, size_t total_elems, size_t size,
+			int (*cmp)(const void *, const void *)){
+	sort(base, total_elems, size, cmp, NULL);
+}
+
+#else
+
 extern void yaffs_qsort(void *const base, size_t total_elems, size_t size,
 			int (*cmp)(const void *, const void *));
 
 #endif
+#endif
--- a/fs/yaffs2/yaffs_tagscompat.c
+++ b/fs/yaffs2/yaffs_tagscompat.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -15,6 +15,7 @@
 #include "yaffs_tagscompat.h"
 #include "yaffs_ecc.h"
 #include "yaffs_getblockinfo.h"
+#include "yaffs_trace.h"
 
 static void yaffs_HandleReadDataError(yaffs_Device *dev, int chunkInNAND);
 #ifdef NOTYET
@@ -163,15 +164,14 @@ static int yaffs_WriteChunkToNAND(struct
 				int chunkInNAND, const __u8 *data,
 				yaffs_Spare *spare)
 {
-	if (chunkInNAND < dev->startBlock * dev->nChunksPerBlock) {
+	if (chunkInNAND < dev->param.startBlock * dev->param.nChunksPerBlock) {
 		T(YAFFS_TRACE_ERROR,
 		  (TSTR("**>> yaffs chunk %d is not valid" TENDSTR),
 		   chunkInNAND));
 		return YAFFS_FAIL;
 	}
 
-	dev->nPageWrites++;
-	return dev->writeChunkToNAND(dev, chunkInNAND, data, spare);
+	return dev->param.writeChunkToNAND(dev, chunkInNAND, data, spare);
 }
 
 static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
@@ -184,16 +184,14 @@ static int yaffs_ReadChunkFromNAND(struc
 	int retVal;
 	yaffs_Spare localSpare;
 
-	dev->nPageReads++;
-
 	if (!spare && data) {
 		/* If we don't have a real spare, then we use a local one. */
 		/* Need this for the calculation of the ecc */
 		spare = &localSpare;
 	}
 
-	if (!dev->useNANDECC) {
-		retVal = dev->readChunkFromNAND(dev, chunkInNAND, data, spare);
+	if (!dev->param.useNANDECC) {
+		retVal = dev->param.readChunkFromNAND(dev, chunkInNAND, data, spare);
 		if (data && doErrorCorrection) {
 			/* Do ECC correction */
 			/* Todo handle any errors */
@@ -254,7 +252,7 @@ static int yaffs_ReadChunkFromNAND(struc
 
 		memset(&nspare, 0, sizeof(nspare));
 
-		retVal = dev->readChunkFromNAND(dev, chunkInNAND, data,
+		retVal = dev->param.readChunkFromNAND(dev, chunkInNAND, data,
 					(yaffs_Spare *) &nspare);
 		memcpy(spare, &nspare, sizeof(yaffs_Spare));
 		if (data && doErrorCorrection) {
@@ -307,10 +305,10 @@ static int yaffs_CheckChunkErased(struct
 	static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
 	static __u8 data[YAFFS_BYTES_PER_CHUNK];
 	/* Might as well always allocate the larger size for */
-	/* dev->useNANDECC == true; */
+	/* dev->param.useNANDECC == true; */
 	static __u8 spare[sizeof(struct yaffs_NANDSpare)];
 
-	dev->readChunkFromNAND(dev, chunkInNAND, data, (yaffs_Spare *) spare);
+	dev->param.readChunkFromNAND(dev, chunkInNAND, data, (yaffs_Spare *) spare);
 
 	if (!init) {
 		memset(cmpbuf, 0xff, YAFFS_BYTES_PER_CHUNK);
@@ -333,7 +331,7 @@ static int yaffs_CheckChunkErased(struct
 
 static void yaffs_HandleReadDataError(yaffs_Device *dev, int chunkInNAND)
 {
-	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+	int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
 
 	/* Mark the block for retirement */
 	yaffs_GetBlockInfo(dev, blockInNAND + dev->blockOffset)->needsRetiring = 1;
@@ -365,7 +363,7 @@ static void yaffs_HandleUpdateChunk(yaff
 
 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND)
 {
-	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+	int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
 
 	/* Mark the block for retirement */
 	yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
@@ -424,7 +422,7 @@ int yaffs_TagsCompatabilityWriteChunkWit
 
 		tags.serialNumber = eTags->serialNumber;
 
-		if (!dev->useNANDECC && data)
+		if (!dev->param.useNANDECC && data)
 			yaffs_CalcECC(data, &spare);
 
 		yaffs_LoadTagsIntoSpare(&spare, &tags);
@@ -498,9 +496,9 @@ int yaffs_TagsCompatabilityMarkNANDBlock
 
 	spare.blockStatus = 'Y';
 
-	yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL,
+	yaffs_WriteChunkToNAND(dev, blockInNAND * dev->param.nChunksPerBlock, NULL,
 			       &spare);
-	yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1,
+	yaffs_WriteChunkToNAND(dev, blockInNAND * dev->param.nChunksPerBlock + 1,
 			       NULL, &spare);
 
 	return YAFFS_OK;
@@ -525,9 +523,9 @@ int yaffs_TagsCompatabilityQueryNANDBloc
 
 	*sequenceNumber = 0;
 
-	yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock, NULL,
+	yaffs_ReadChunkFromNAND(dev, blockNo * dev->param.nChunksPerBlock, NULL,
 				&spare0, &dummy, 1);
-	yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock + 1, NULL,
+	yaffs_ReadChunkFromNAND(dev, blockNo * dev->param.nChunksPerBlock + 1, NULL,
 				&spare1, &dummy, 1);
 
 	if (yaffs_CountBits(spare0.blockStatus & spare1.blockStatus) < 7)
--- a/fs/yaffs2/yaffs_tagscompat.h
+++ b/fs/yaffs2/yaffs_tagscompat.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_tagsvalidity.c
+++ b/fs/yaffs2/yaffs_tagsvalidity.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_tagsvalidity.h
+++ b/fs/yaffs2/yaffs_tagsvalidity.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- /dev/null
+++ b/fs/yaffs2/yaffs_trace.h
@@ -0,0 +1,60 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YTRACE_H__
+#define __YTRACE_H__
+
+extern unsigned int yaffs_traceMask;
+extern unsigned int yaffs_wr_attempts;
+
+/*
+ * Tracing flags.
+ * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
+ */
+
+#define YAFFS_TRACE_OS			0x00000002
+#define YAFFS_TRACE_ALLOCATE		0x00000004
+#define YAFFS_TRACE_SCAN		0x00000008
+#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
+#define YAFFS_TRACE_ERASE		0x00000020
+#define YAFFS_TRACE_GC			0x00000040
+#define YAFFS_TRACE_WRITE		0x00000080
+#define YAFFS_TRACE_TRACING		0x00000100
+#define YAFFS_TRACE_DELETION		0x00000200
+#define YAFFS_TRACE_BUFFERS		0x00000400
+#define YAFFS_TRACE_NANDACCESS		0x00000800
+#define YAFFS_TRACE_GC_DETAIL		0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
+#define YAFFS_TRACE_MTD			0x00004000
+#define YAFFS_TRACE_CHECKPOINT		0x00008000
+
+#define YAFFS_TRACE_VERIFY		0x00010000
+#define YAFFS_TRACE_VERIFY_NAND		0x00020000
+#define YAFFS_TRACE_VERIFY_FULL		0x00040000
+#define YAFFS_TRACE_VERIFY_ALL		0x000F0000
+
+#define YAFFS_TRACE_SYNC		0x00100000
+#define YAFFS_TRACE_BACKGROUND		0x00200000
+#define YAFFS_TRACE_LOCK		0x00400000
+
+#define YAFFS_TRACE_ERROR		0x40000000
+#define YAFFS_TRACE_BUG			0x80000000
+#define YAFFS_TRACE_ALWAYS		0xF0000000
+
+
+#define T(mask, p) do { if ((mask) & (yaffs_traceMask | YAFFS_TRACE_ALWAYS)) TOUT(p); } while (0)
+
+#endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.c
@@ -0,0 +1,626 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include "yaffs_verify.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+int yaffs_SkipVerification(yaffs_Device *dev)
+{
+	dev=dev;
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipFullVerification(yaffs_Device *dev)
+{
+	dev=dev;
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipNANDVerification(yaffs_Device *dev)
+{
+	dev=dev;
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+
+static const char *blockStateName[] = {
+"Unknown",
+"Needs scanning",
+"Scanning",
+"Empty",
+"Allocating",
+"Full",
+"Dirty",
+"Checkpoint",
+"Collecting",
+"Dead"
+};
+
+
+void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
+{
+	int actuallyUsed;
+	int inUse;
+
+	if (yaffs_SkipVerification(dev))
+		return;
+
+	/* Report illegal runtime states */
+	if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
+		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
+
+	switch (bi->blockState) {
+	case YAFFS_BLOCK_STATE_UNKNOWN:
+	case YAFFS_BLOCK_STATE_SCANNING:
+	case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
+		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
+		n, blockStateName[bi->blockState]));
+	}
+
+	/* Check pages in use and soft deletions are legal */
+
+	actuallyUsed = bi->pagesInUse - bi->softDeletions;
+
+	if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock ||
+	   bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
+	   actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock)
+		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
+		n, bi->pagesInUse, bi->softDeletions));
+
+
+	/* Check chunk bitmap legal */
+	inUse = yaffs_CountChunkBits(dev, n);
+	if (inUse != bi->pagesInUse)
+		T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
+			n, bi->pagesInUse, inUse));
+
+}
+
+
+
+void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
+{
+	yaffs_VerifyBlock(dev, bi, n);
+
+	/* After collection the block should be in the erased state */
+
+	if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
+			bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
+		T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
+			n, bi->blockState));
+	}
+}
+
+void yaffs_VerifyBlocks(yaffs_Device *dev)
+{
+	int i;
+	int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
+	int nIllegalBlockStates = 0;
+
+	if (yaffs_SkipVerification(dev))
+		return;
+
+	memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
+
+	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
+		yaffs_VerifyBlock(dev, bi, i);
+
+		if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
+			nBlocksPerState[bi->blockState]++;
+		else
+			nIllegalBlockStates++;
+	}
+
+	T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
+	T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
+
+	T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
+	if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
+		T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
+
+	for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
+		T(YAFFS_TRACE_VERIFY,
+		  (TSTR("%s %d blocks"TENDSTR),
+		  blockStateName[i], nBlocksPerState[i]));
+
+	if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
+		 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
+
+	if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
+		 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
+
+	if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
+		 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
+
+	T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
+
+}
+
+/*
+ * Verify the object header. oh must be valid, but obj and tags may be NULL in which
+ * case those tests will not be performed.
+ */
+void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
+{
+	if (obj && yaffs_SkipVerification(obj->myDev))
+		return;
+
+	if (!(tags && obj && oh)) {
+		T(YAFFS_TRACE_VERIFY,
+				(TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
+				tags, obj, oh));
+		return;
+	}
+
+	if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
+			oh->type > YAFFS_OBJECT_TYPE_MAX)
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
+			tags->objectId, oh->type));
+
+	if (tags->objectId != obj->objectId)
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d header mismatch objectId %d"TENDSTR),
+			tags->objectId, obj->objectId));
+
+
+	/*
+	 * Check that the object's parent ids match if parentCheck requested.
+	 *
+	 * Tests do not apply to the root object.
+	 */
+
+	if (parentCheck && tags->objectId > 1 && !obj->parent)
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
+			tags->objectId, oh->parentObjectId));
+
+	if (parentCheck && obj->parent &&
+			oh->parentObjectId != obj->parent->objectId &&
+			(oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
+			obj->parent->objectId != YAFFS_OBJECTID_DELETED))
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
+			tags->objectId, oh->parentObjectId, obj->parent->objectId));
+
+	if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d header name is NULL"TENDSTR),
+			obj->objectId));
+
+	if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d header name is 0xFF"TENDSTR),
+			obj->objectId));
+}
+
+
+#if 0
+/* Not being used, but don't want to throw away yet */
+int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
+					__u32 level, int chunkOffset)
+{
+	int i;
+	yaffs_Device *dev = obj->myDev;
+	int ok = 1;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+				if (tn->internal[i]) {
+					ok = yaffs_VerifyTnodeWorker(obj,
+							tn->internal[i],
+							level - 1,
+							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+				}
+			}
+		} else if (level == 0) {
+			yaffs_ExtendedTags tags;
+			__u32 objectId = obj->objectId;
+
+			chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
+
+			for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
+				__u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+
+				if (theChunk > 0) {
+					/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
+					yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
+					if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
+						T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
+							objectId, chunkOffset, theChunk,
+							tags.objectId, tags.chunkId));
+					}
+				}
+				chunkOffset++;
+			}
+		}
+	}
+
+	return ok;
+
+}
+
+#endif
+
+void yaffs_VerifyFile(yaffs_Object *obj)
+{
+	int requiredTallness;
+	int actualTallness;
+	__u32 lastChunk;
+	__u32 x;
+	__u32 i;
+	yaffs_Device *dev;
+	yaffs_ExtendedTags tags;
+	yaffs_Tnode *tn;
+	__u32 objectId;
+
+	if (!obj)
+		return;
+
+	if (yaffs_SkipVerification(obj->myDev))
+		return;
+
+	dev = obj->myDev;
+	objectId = obj->objectId;
+
+	/* Check file size is consistent with tnode depth */
+	lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
+	x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (x > 0) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+
+	actualTallness = obj->variant.fileVariant.topLevel;
+
+	/* Check that the chunks in the tnode tree are all correct.
+	 * We do this by scanning through the tnode tree and
+	 * checking the tags for every chunk match.
+	 */
+
+	if (yaffs_SkipNANDVerification(dev))
+		return;
+
+	for (i = 1; i <= lastChunk; i++) {
+		tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
+
+		if (tn) {
+			__u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+			if (theChunk > 0) {
+				/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
+				yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
+				if (tags.objectId != objectId || tags.chunkId != i) {
+					T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
+						objectId, i, theChunk,
+						tags.objectId, tags.chunkId));
+				}
+			}
+		}
+	}
+}
+
+
+void yaffs_VerifyHardLink(yaffs_Object *obj)
+{
+	if (obj && yaffs_SkipVerification(obj->myDev))
+		return;
+
+	/* Verify sane equivalent object */
+}
+
+void yaffs_VerifySymlink(yaffs_Object *obj)
+{
+	if (obj && yaffs_SkipVerification(obj->myDev))
+		return;
+
+	/* Verify symlink string */
+}
+
+void yaffs_VerifySpecial(yaffs_Object *obj)
+{
+	if (obj && yaffs_SkipVerification(obj->myDev))
+		return;
+}
+
+void yaffs_VerifyObject(yaffs_Object *obj)
+{
+	yaffs_Device *dev;
+
+	__u32 chunkMin;
+	__u32 chunkMax;
+
+	__u32 chunkIdOk;
+	__u32 chunkInRange;
+	__u32 chunkShouldNotBeDeleted;
+	__u32 chunkValid;
+
+	if (!obj)
+		return;
+
+	if (obj->beingCreated)
+		return;
+
+	dev = obj->myDev;
+
+	if (yaffs_SkipVerification(dev))
+		return;
+
+	/* Check sane object header chunk */
+
+	chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
+	chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
+
+	chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
+	chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
+	chunkValid = chunkInRange &&
+			yaffs_CheckChunkBit(dev,
+					obj->hdrChunk / dev->param.nChunksPerBlock,
+					obj->hdrChunk % dev->param.nChunksPerBlock);
+	chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
+
+	if (!obj->fake &&
+			(!chunkIdOk || chunkShouldNotBeDeleted)) {
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
+			obj->objectId, obj->hdrChunk,
+			chunkIdOk ? "" : ",out of range",
+			chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
+	}
+
+	if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
+		yaffs_ExtendedTags tags;
+		yaffs_ObjectHeader *oh;
+		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+		oh = (yaffs_ObjectHeader *)buffer;
+
+		yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
+				&tags);
+
+		yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
+
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+	}
+
+	/* Verify it has a parent */
+	if (obj && !obj->fake &&
+			(!obj->parent || obj->parent->myDev != dev)) {
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
+			obj->objectId, obj->parent));
+	}
+
+	/* Verify parent is a directory */
+	if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
+			obj->objectId, obj->parent->variantType));
+	}
+
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		yaffs_VerifyFile(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		yaffs_VerifySymlink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		yaffs_VerifyDirectory(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		yaffs_VerifyHardLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		yaffs_VerifySpecial(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+	default:
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d has illegaltype %d"TENDSTR),
+		obj->objectId, obj->variantType));
+		break;
+	}
+}
+
+void yaffs_VerifyObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	int i;
+	struct ylist_head *lh;
+
+	if (yaffs_SkipVerification(dev))
+		return;
+
+	/* Iterate through the objects in each hash entry */
+
+	for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
+		ylist_for_each(lh, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = ylist_entry(lh, yaffs_Object, hashLink);
+				yaffs_VerifyObject(obj);
+			}
+		}
+	}
+}
+
+
+void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
+{
+	struct ylist_head *lh;
+	yaffs_Object *listObj;
+
+	int count = 0;
+
+	if (!obj) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
+		YBUG();
+		return;
+	}
+
+	if (yaffs_SkipVerification(obj->myDev))
+		return;
+
+	if (!obj->parent) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
+		YBUG();
+		return;
+	}
+
+	if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
+		YBUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
+		if (lh) {
+			listObj = ylist_entry(lh, yaffs_Object, siblings);
+			yaffs_VerifyObject(listObj);
+			if (obj == listObj)
+				count++;
+		}
+	 }
+
+	if (count != 1) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
+		YBUG();
+	}
+}
+
+void yaffs_VerifyDirectory(yaffs_Object *directory)
+{
+	struct ylist_head *lh;
+	yaffs_Object *listObj;
+
+	if (!directory) {
+		YBUG();
+		return;
+	}
+
+	if (yaffs_SkipFullVerification(directory->myDev))
+		return;
+
+	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
+		YBUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	ylist_for_each(lh, &directory->variant.directoryVariant.children) {
+		if (lh) {
+			listObj = ylist_entry(lh, yaffs_Object, siblings);
+			if (listObj->parent != directory) {
+				T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
+				YBUG();
+			}
+			yaffs_VerifyObjectInDirectory(listObj);
+		}
+	}
+}
+
+static int yaffs_freeVerificationFailures;
+
+void yaffs_VerifyFreeChunks(yaffs_Device *dev)
+{
+	int counted;
+	int difference;
+
+	if (yaffs_SkipVerification(dev))
+		return;
+
+	counted = yaffs_CountFreeChunks(dev);
+
+	difference = dev->nFreeChunks - counted;
+
+	if (difference) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
+		   dev->nFreeChunks, counted, difference));
+		yaffs_freeVerificationFailures++;
+	}
+}
+
+int yaffs_VerifyFileSanity(yaffs_Object *in)
+{
+#if 0
+	int chunk;
+	int nChunks;
+	int fSize;
+	int failed = 0;
+	int objId;
+	yaffs_Tnode *tn;
+	yaffs_Tags localTags;
+	yaffs_Tags *tags = &localTags;
+	int theChunk;
+	int chunkDeleted;
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+
+	objId = in->objectId;
+	fSize = in->variant.fileVariant.fileSize;
+	nChunks =
+	    (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
+
+	for (chunk = 1; chunk <= nChunks; chunk++) {
+		tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
+					   chunk);
+
+		if (tn) {
+
+			theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
+
+			if (yaffs_CheckChunkBits
+			    (dev, theChunk / dev->param.nChunksPerBlock,
+			     theChunk % dev->param.nChunksPerBlock)) {
+
+				yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
+							    tags,
+							    &chunkDeleted);
+				if (yaffs_TagsMatch
+				    (tags, in->objectId, chunk, chunkDeleted)) {
+					/* found it; */
+
+				}
+			} else {
+
+				failed = 1;
+			}
+
+		} else {
+			/* T(("No level 0 found for %d\n", chunk)); */
+		}
+	}
+
+	return failed ? YAFFS_FAIL : YAFFS_OK;
+#else
+	in=in;
+	return YAFFS_OK;
+#endif
+}
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.h
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __YAFFS_VERIFY_H__
+#define __YAFFS_VERIFY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n);
+void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n);
+void yaffs_VerifyBlocks(yaffs_Device *dev);
+
+void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck);
+void yaffs_VerifyFile(yaffs_Object *obj);
+void yaffs_VerifyHardLink(yaffs_Object *obj);
+void yaffs_VerifySymlink(yaffs_Object *obj);
+void yaffs_VerifySpecial(yaffs_Object *obj);
+void yaffs_VerifyObject(yaffs_Object *obj);
+void yaffs_VerifyObjects(yaffs_Device *dev);
+void yaffs_VerifyObjectInDirectory(yaffs_Object *obj);
+void yaffs_VerifyDirectory(yaffs_Object *directory);
+void yaffs_VerifyFreeChunks(yaffs_Device *dev);
+
+int yaffs_VerifyFileSanity(yaffs_Object *obj);
+
+int yaffs_SkipVerification(yaffs_Device *dev);
+
+#endif
+
--- /dev/null
+++ b/fs/yaffs2/yaffs_vfs_glue.c
@@ -0,0 +1,3577 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ * Acknowledgements:
+ * Luc van OostenRyck for numerous patches.
+ * Nick Bane for numerous patches.
+ * Nick Bane for 2.5/2.6 integration.
+ * Andras Toth for mknod rdev issue.
+ * Michael Fischer for finding the problem with inode inconsistency.
+ * Some code bodily lifted from JFFS
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ *
+ * This is the file system front-end to YAFFS that hooks it up to
+ * the VFS.
+ *
+ * Special notes:
+ * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
+ *         this superblock
+ * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
+ *         superblock
+ * >> inode->u.generic_ip points to the associated yaffs_Object.
+ */
+
+/*
+ * There are two variants of the VFS glue code. This variant should compile
+ * for any version of Linux.
+ */
+#include <linux/version.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
+#define YAFFS_COMPILE_BACKGROUND
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6, 23))
+#define YAFFS_COMPILE_FREEZER
+#endif
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
+#define YAFFS_COMPILE_EXPORTFS
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
+#define YAFFS_USE_SETATTR_COPY
+#define YAFFS_USE_TRUNCATE_SETSIZE
+#endif
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
+#define YAFFS_HAS_EVICT_INODE
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
+#define YAFFS_NEW_FOLLOW_LINK 1
+#else
+#define YAFFS_NEW_FOLLOW_LINK 0
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
+#include <linux/config.h>
+#endif
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+#include <linux/namei.h>
+#endif
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+#include <linux/exportfs.h>
+#endif
+
+#ifdef YAFFS_COMPILE_BACKGROUND
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#endif
+#ifdef YAFFS_COMPILE_FREEZER
+#include <linux/freezer.h>
+#endif
+
+#include <asm/div64.h>
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+#include <linux/statfs.h>
+
+#define UnlockPage(p) unlock_page(p)
+#define Page_Uptodate(page)	test_bit(PG_uptodate, &(page)->flags)
+
+/* FIXME: use sb->s_id instead ? */
+#define yaffs_devname(sb, buf)	bdevname(sb->s_bdev, buf)
+
+#else
+
+#include <linux/locks.h>
+#define	BDEVNAME_SIZE		0
+#define	yaffs_devname(sb, buf)	kdevname(sb->s_dev)
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
+/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
+#define __user
+#endif
+
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
+#define YPROC_ROOT  (&proc_root)
+#else
+#define YPROC_ROOT  NULL
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
+#define Y_INIT_TIMER(a)	init_timer(a)
+#else
+#define Y_INIT_TIMER(a)	init_timer_on_stack(a)
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+#define WRITE_SIZE_STR "writesize"
+#define WRITE_SIZE(mtd) ((mtd)->writesize)
+#else
+#define WRITE_SIZE_STR "oobblock"
+#define WRITE_SIZE(mtd) ((mtd)->oobblock)
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
+#define YAFFS_USE_WRITE_BEGIN_END 1
+#else
+#define YAFFS_USE_WRITE_BEGIN_END 0
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
+static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
+{
+	uint64_t result = partition_size;
+	do_div(result, block_size);
+	return (uint32_t)result;
+}
+#else
+#define YCALCBLOCKS(s, b) ((s)/(b))
+#endif
+
+#include <linux/uaccess.h>
+#include <linux/mtd/mtd.h>
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+
+#include "yaffs_linux.h"
+
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif1.h"
+#include "yaffs_mtdif2.h"
+
+unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
+unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
+unsigned int yaffs_auto_checkpoint = 1;
+unsigned int yaffs_gc_control = 1;
+unsigned int yaffs_bg_enable = 1;
+
+/* Module Parameters */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+module_param(yaffs_traceMask, uint, 0644);
+module_param(yaffs_wr_attempts, uint, 0644);
+module_param(yaffs_auto_checkpoint, uint, 0644);
+module_param(yaffs_gc_control, uint, 0644);
+module_param(yaffs_bg_enable, uint, 0644);
+#else
+MODULE_PARM(yaffs_traceMask, "i");
+MODULE_PARM(yaffs_wr_attempts, "i");
+MODULE_PARM(yaffs_auto_checkpoint, "i");
+MODULE_PARM(yaffs_gc_control, "i");
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
+/* use iget and read_inode */
+#define Y_IGET(sb, inum) iget((sb), (inum))
+static void yaffs_read_inode(struct inode *inode);
+
+#else
+/* Call local equivalent */
+#define YAFFS_USE_OWN_IGET
+#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
+#define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
+#else
+#define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
+#endif
+
+#define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
+#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+#define yaffs_SuperToDevice(sb)	((yaffs_Device *)sb->s_fs_info)
+#else
+#define yaffs_SuperToDevice(sb)	((yaffs_Device *)sb->u.generic_sbp)
+#endif
+
+
+#define update_dir_time(dir) do {\
+			(dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
+		} while(0)
+		
+static void yaffs_put_super(struct super_block *sb);
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+				loff_t *pos);
+static ssize_t yaffs_hold_space(struct file *f);
+static void yaffs_release_space(struct file *f);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_file_flush(struct file *file, fl_owner_t id);
+#else
+static int yaffs_file_flush(struct file *file);
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+static int yaffs_sync_object(struct file *file, int datasync);
+#else
+static int yaffs_sync_object(struct file *file, struct dentry *dentry,
+				int datasync);
+#endif
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+			struct nameidata *n);
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+					struct nameidata *n);
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
+#endif
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+			struct dentry *dentry);
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+			const char *symname);
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+			dev_t dev);
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+			int dev);
+#endif
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry);
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_sync_fs(struct super_block *sb, int wait);
+static void yaffs_write_super(struct super_block *sb);
+#else
+static int yaffs_sync_fs(struct super_block *sb);
+static int yaffs_write_super(struct super_block *sb);
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
+#endif
+
+#ifdef YAFFS_HAS_PUT_INODE
+static void yaffs_put_inode(struct inode *inode);
+#endif
+
+#ifdef YAFFS_HAS_EVICT_INODE
+static void yaffs_evict_inode(struct inode *);
+#else
+static void yaffs_delete_inode(struct inode *);
+static void yaffs_clear_inode(struct inode *);
+#endif
+
+static int yaffs_readpage(struct file *file, struct page *page);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
+#else
+static int yaffs_writepage(struct page *page);
+#endif
+
+#ifdef CONFIG_YAFFS_XATTR
+int yaffs_setxattr(struct dentry *dentry, const char *name,
+			const void *value, size_t size, int flags);
+ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
+			size_t size);
+int yaffs_removexattr(struct dentry *dentry, const char *name);
+ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
+#endif
+
+
+#if (YAFFS_USE_WRITE_BEGIN_END != 0)
+static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
+				loff_t pos, unsigned len, unsigned flags,
+				struct page **pagep, void **fsdata);
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+				loff_t pos, unsigned len, unsigned copied,
+				struct page *pg, void *fsdadata);
+#else
+static int yaffs_prepare_write(struct file *f, struct page *pg,
+				unsigned offset, unsigned to);
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
+				unsigned to);
+
+#endif
+
+static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
+				int buflen);
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
+#else
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
+#endif
+
+static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev);
+
+static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
+
+static int yaffs_vfs_setattr(struct inode *, struct iattr *);
+
+
+static struct address_space_operations yaffs_file_address_operations = {
+	.readpage = yaffs_readpage,
+	.writepage = yaffs_writepage,
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+	.write_begin = yaffs_write_begin,
+	.write_end = yaffs_write_end,
+#else
+	.prepare_write = yaffs_prepare_write,
+	.commit_write = yaffs_commit_write,
+#endif
+};
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
+static const struct file_operations yaffs_file_operations = {
+	.read = do_sync_read,
+	.write = do_sync_write,
+	.aio_read = generic_file_aio_read,
+	.aio_write = generic_file_aio_write,
+	.mmap = generic_file_mmap,
+	.flush = yaffs_file_flush,
+	.fsync = yaffs_sync_object,
+	.splice_read = generic_file_splice_read,
+	.splice_write = generic_file_splice_write,
+	.llseek = generic_file_llseek,
+};
+
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
+
+static const struct file_operations yaffs_file_operations = {
+	.read = do_sync_read,
+	.write = do_sync_write,
+	.aio_read = generic_file_aio_read,
+	.aio_write = generic_file_aio_write,
+	.mmap = generic_file_mmap,
+	.flush = yaffs_file_flush,
+	.fsync = yaffs_sync_object,
+	.sendfile = generic_file_sendfile,
+};
+
+#else
+
+static const struct file_operations yaffs_file_operations = {
+	.read = generic_file_read,
+	.write = generic_file_write,
+	.mmap = generic_file_mmap,
+	.flush = yaffs_file_flush,
+	.fsync = yaffs_sync_object,
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+	.sendfile = generic_file_sendfile,
+#endif
+};
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
+static void zero_user_segment(struct page *page, unsigned start, unsigned end)
+{
+	void * kaddr = kmap_atomic(page, KM_USER0);
+	memset(kaddr + start, 0, end - start);
+	kunmap_atomic(kaddr, KM_USER0);
+	flush_dcache_page(page);
+}
+#endif
+
+
+static const struct inode_operations yaffs_file_inode_operations = {
+	.setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.listxattr = yaffs_listxattr,
+	.removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct inode_operations yaffs_symlink_inode_operations = {
+	.readlink = yaffs_readlink,
+	.follow_link = yaffs_follow_link,
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+	.put_link = yaffs_put_link,
+#endif
+	.setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.listxattr = yaffs_listxattr,
+	.removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct inode_operations yaffs_dir_inode_operations = {
+	.create = yaffs_create,
+	.lookup = yaffs_lookup,
+	.link = yaffs_link,
+	.unlink = yaffs_unlink,
+	.symlink = yaffs_symlink,
+	.mkdir = yaffs_mkdir,
+	.rmdir = yaffs_unlink,
+	.mknod = yaffs_mknod,
+	.rename = yaffs_rename,
+	.setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.listxattr = yaffs_listxattr,
+	.removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct file_operations yaffs_dir_operations = {
+	.read = generic_read_dir,
+	.readdir = yaffs_readdir,
+	.fsync = yaffs_sync_object,
+	.llseek = yaffs_dir_llseek,
+};
+
+static const struct super_operations yaffs_super_ops = {
+	.statfs = yaffs_statfs,
+
+#ifndef YAFFS_USE_OWN_IGET
+	.read_inode = yaffs_read_inode,
+#endif
+#ifdef YAFFS_HAS_PUT_INODE
+	.put_inode = yaffs_put_inode,
+#endif
+	.put_super = yaffs_put_super,
+#ifdef YAFFS_HAS_EVICT_INODE
+	.evict_inode = yaffs_evict_inode,
+#else
+	.delete_inode = yaffs_delete_inode,
+	.clear_inode = yaffs_clear_inode,
+#endif
+	.sync_fs = yaffs_sync_fs,
+	.write_super = yaffs_write_super,
+};
+
+
+static  int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
+{
+#ifdef  YAFFS_USE_SETATTR_COPY
+	setattr_copy(inode,attr);
+	return 0;
+#else
+	return inode_setattr(inode, attr);
+#endif
+
+}
+
+static  int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
+{
+#ifdef  YAFFS_USE_TRUNCATE_SETSIZE
+	truncate_setsize(inode,newsize);
+	return 0;
+#else
+	truncate_inode_pages(&inode->i_data,newsize);
+	return 0;
+#endif
+
+}
+
+static unsigned yaffs_gc_control_callback(yaffs_Device *dev)
+{
+	return yaffs_gc_control;
+}
+                	                                                                                          	
+static void yaffs_GrossLock(yaffs_Device *dev)
+{
+	T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
+	down(&(yaffs_DeviceToLC(dev)->grossLock));
+	T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
+}
+
+static void yaffs_GrossUnlock(yaffs_Device *dev)
+{
+	T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
+	up(&(yaffs_DeviceToLC(dev)->grossLock));
+}
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+
+static struct inode *
+yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
+{
+	return Y_IGET(sb, ino);
+}
+
+static struct dentry *
+yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
+}
+
+static struct dentry *
+ yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
+}
+
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
+{
+
+	struct super_block *sb = dentry->d_inode->i_sb;
+	struct dentry *parent = ERR_PTR(-ENOENT);
+	struct inode *inode;
+	unsigned long parent_ino;
+	yaffs_Object *d_obj;
+	yaffs_Object *parent_obj;
+
+	d_obj = yaffs_InodeToObject(dentry->d_inode);
+
+	if (d_obj) {
+		parent_obj = d_obj->parent;
+		if (parent_obj) {
+			parent_ino = yaffs_GetObjectInode(parent_obj);
+			inode = Y_IGET(sb, parent_ino);
+
+			if (IS_ERR(inode)) {
+				parent = ERR_CAST(inode);
+			} else {
+				parent = d_obtain_alias(inode);
+				if (!IS_ERR(parent)) {
+					parent = ERR_PTR(-ENOMEM);
+					iput(inode);
+				}
+			}
+		}
+	}
+
+	return parent;
+}
+
+/* Just declare a zero structure as a NULL value implies
+ * using the default functions of exportfs.
+ */
+
+static struct export_operations yaffs_export_ops =
+{
+	.fh_to_dentry = yaffs2_fh_to_dentry,
+	.fh_to_parent = yaffs2_fh_to_parent,
+	.get_parent = yaffs2_get_parent,
+} ;
+
+#endif
+
+/*-----------------------------------------------------------------*/
+/* Directory search context allows us to unlock access to yaffs during
+ * filldir without causing problems with the directory being modified.
+ * This is similar to the tried and tested mechanism used in yaffs direct.
+ *
+ * A search context iterates along a doubly linked list of siblings in the
+ * directory. If the iterating object is deleted then this would corrupt
+ * the list iteration, likely causing a crash. The search context avoids
+ * this by using the removeObjectCallback to move the search context to the
+ * next object before the object is deleted.
+ *
+ * Many readdirs (and thus seach conexts) may be alive simulateously so
+ * each yaffs_Device has a list of these.
+ *
+ * A seach context lives for the duration of a readdir.
+ *
+ * All these functions must be called while yaffs is locked.
+ */
+
+struct yaffs_SearchContext {
+	yaffs_Device *dev;
+	yaffs_Object *dirObj;
+	yaffs_Object *nextReturn;
+	struct ylist_head others;
+};
+
+/*
+ * yaffs_NewSearch() creates a new search context, initialises it and
+ * adds it to the device's search context list.
+ *
+ * Called at start of readdir.
+ */
+static struct yaffs_SearchContext * yaffs_NewSearch(yaffs_Object *dir)
+{
+	yaffs_Device *dev = dir->myDev;
+	struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
+	if(sc){
+		sc->dirObj = dir;
+		sc->dev = dev;
+		if( ylist_empty(&sc->dirObj->variant.directoryVariant.children))
+			sc->nextReturn = NULL;
+		else
+			sc->nextReturn = ylist_entry(
+                                dir->variant.directoryVariant.children.next,
+				yaffs_Object,siblings);
+		YINIT_LIST_HEAD(&sc->others);
+		ylist_add(&sc->others,&(yaffs_DeviceToLC(dev)->searchContexts));
+	}
+	return sc;
+}
+
+/*
+ * yaffs_EndSearch() disposes of a search context and cleans up.
+ */
+static void yaffs_EndSearch(struct yaffs_SearchContext * sc)
+{
+	if(sc){
+		ylist_del(&sc->others);
+		YFREE(sc);
+	}
+}
+
+/*
+ * yaffs_SearchAdvance() moves a search context to the next object.
+ * Called when the search iterates or when an object removal causes
+ * the search context to be moved to the next object.
+ */
+static void yaffs_SearchAdvance(struct yaffs_SearchContext *sc)
+{
+        if(!sc)
+                return;
+
+        if( sc->nextReturn == NULL ||
+                ylist_empty(&sc->dirObj->variant.directoryVariant.children))
+                sc->nextReturn = NULL;
+        else {
+                struct ylist_head *next = sc->nextReturn->siblings.next;
+
+                if( next == &sc->dirObj->variant.directoryVariant.children)
+                        sc->nextReturn = NULL; /* end of list */
+                else
+                        sc->nextReturn = ylist_entry(next,yaffs_Object,siblings);
+        }
+}
+
+/*
+ * yaffs_RemoveObjectCallback() is called when an object is unlinked.
+ * We check open search contexts and advance any which are currently
+ * on the object being iterated.
+ */
+static void yaffs_RemoveObjectCallback(yaffs_Object *obj)
+{
+
+        struct ylist_head *i;
+        struct yaffs_SearchContext *sc;
+        struct ylist_head *search_contexts = &(yaffs_DeviceToLC(obj->myDev)->searchContexts);
+
+
+        /* Iterate through the directory search contexts.
+         * If any are currently on the object being removed, then advance
+         * the search context to the next object to prevent a hanging pointer.
+         */
+         ylist_for_each(i, search_contexts) {
+                if (i) {
+                        sc = ylist_entry(i, struct yaffs_SearchContext,others);
+                        if(sc->nextReturn == obj)
+                                yaffs_SearchAdvance(sc);
+                }
+	}
+
+}
+
+
+/*-----------------------------------------------------------------*/
+
+static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
+			int buflen)
+{
+	unsigned char *alias;
+	int ret;
+
+	yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+
+	yaffs_GrossLock(dev);
+
+	alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
+
+	yaffs_GrossUnlock(dev);
+
+	if (!alias)
+		return -ENOMEM;
+
+	ret = vfs_readlink(dentry, buffer, buflen, alias);
+	kfree(alias);
+	return ret;
+}
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+#else
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+#endif
+{
+	unsigned char *alias;
+	int ret;
+	yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+
+	yaffs_GrossLock(dev);
+
+	alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
+	yaffs_GrossUnlock(dev);
+
+	if (!alias) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+	nd_set_link(nd, alias);
+	ret = (int)alias;
+out:
+	return ERR_PTR(ret);
+#else
+	ret = vfs_follow_link(nd, alias);
+	kfree(alias);
+out:
+	return ret;
+#endif
+}
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
+	kfree(alias);
+}
+#endif
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+				yaffs_Object *obj);
+
+/*
+ * Lookup is used to find objects in the fs
+ */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+				struct nameidata *n)
+#else
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
+#endif
+{
+	yaffs_Object *obj;
+	struct inode *inode = NULL;	/* NCB 2.5/2.6 needs NULL here */
+
+	yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
+
+	if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+		yaffs_GrossLock(dev);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_lookup for %d:%s\n"),
+		yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
+
+	obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
+					dentry->d_name.name);
+
+	obj = yaffs_GetEquivalentObject(obj);	/* in case it was a hardlink */
+
+	/* Can't hold gross lock when calling yaffs_get_inode() */
+	if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+		yaffs_GrossUnlock(dev);
+
+	if (obj) {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_lookup found %d\n"), obj->objectId));
+
+		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+
+		if (inode) {
+			T(YAFFS_TRACE_OS,
+				(TSTR("yaffs_loookup dentry \n")));
+/* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
+ * d_add even if NULL inode */
+#if 0
+			/*dget(dentry); // try to solve directory bug */
+			d_add(dentry, inode);
+
+			/* return dentry; */
+			return NULL;
+#endif
+		}
+
+	} else {
+		T(YAFFS_TRACE_OS,(TSTR("yaffs_lookup not found\n")));
+
+	}
+
+/* added NCB for 2.5/6 compatability - forces add even if inode is
+ * NULL which creates dentry hash */
+	d_add(dentry, inode);
+
+	return NULL;
+}
+
+
+#ifdef YAFFS_HAS_PUT_INODE
+
+/* For now put inode is just for debugging
+ * Put inode is called when the inode **structure** is put.
+ */
+static void yaffs_put_inode(struct inode *inode)
+{
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
+		atomic_read(&inode->i_count)));
+
+}
+#endif
+
+
+static void yaffs_UnstitchObject(struct inode *inode, yaffs_Object *obj)
+{
+	/* Clear the association between the inode and
+	 * the yaffs_Object.
+	 */
+	obj->myInode = NULL;
+	yaffs_InodeToObjectLV(inode) = NULL;
+
+	/* If the object freeing was deferred, then the real
+	 * free happens now.
+	 * This should fix the inode inconsistency problem.
+	 */
+	yaffs_HandleDeferedFree(obj);
+}
+
+#ifdef YAFFS_HAS_EVICT_INODE
+/* yaffs_evict_inode combines into one operation what was previously done in
+ * yaffs_clear_inode() and yaffs_delete_inode()
+ *
+ */
+static void yaffs_evict_inode( struct inode *inode)
+{
+	yaffs_Object *obj;
+	yaffs_Device *dev;
+	int deleteme = 0;
+
+	obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
+		atomic_read(&inode->i_count),
+		obj ? "object exists" : "null object"));
+
+	if (!inode->i_nlink && !is_bad_inode(inode))
+		deleteme = 1;
+	truncate_inode_pages(&inode->i_data,0);
+	end_writeback(inode);
+
+	if(deleteme && obj){
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		yaffs_DeleteObject(obj);
+		yaffs_GrossUnlock(dev);
+	}
+	if (obj) {
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		yaffs_UnstitchObject(inode,obj);
+		yaffs_GrossUnlock(dev);
+	}
+
+
+}
+#else
+
+/* clear is called to tell the fs to release any per-inode data it holds.
+ * The object might still exist on disk and is just being thrown out of the cache
+ * or else the object has actually been deleted and we're being called via
+ * the chain
+ *   yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
+ */
+
+static void yaffs_clear_inode(struct inode *inode)
+{
+	yaffs_Object *obj;
+	yaffs_Device *dev;
+
+	obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_clear_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
+		atomic_read(&inode->i_count),
+		obj ? "object exists" : "null object"));
+
+	if (obj) {
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		yaffs_UnstitchObject(inode,obj);
+		yaffs_GrossUnlock(dev);
+	}
+
+}
+
+/* delete is called when the link count is zero and the inode
+ * is put (ie. nobody wants to know about it anymore, time to
+ * delete the file).
+ * NB Must call clear_inode()
+ */
+static void yaffs_delete_inode(struct inode *inode)
+{
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+	yaffs_Device *dev;
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_delete_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
+		atomic_read(&inode->i_count),
+		obj ? "object exists" : "null object"));
+
+	if (obj) {
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		yaffs_DeleteObject(obj);
+		yaffs_GrossUnlock(dev);
+	}
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+	truncate_inode_pages(&inode->i_data, 0);
+#endif
+	clear_inode(inode);
+}
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_file_flush(struct file *file, fl_owner_t id)
+#else
+static int yaffs_file_flush(struct file *file)
+#endif
+{
+	yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
+
+	yaffs_Device *dev = obj->myDev;
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_file_flush object %d (%s)\n"), obj->objectId,
+		obj->dirty ? "dirty" : "clean"));
+
+	yaffs_GrossLock(dev);
+
+	yaffs_FlushFile(obj, 1, 0);
+
+	yaffs_GrossUnlock(dev);
+
+	return 0;
+}
+
+static int yaffs_readpage_nolock(struct file *f, struct page *pg)
+{
+	/* Lifted from jffs2 */
+
+	yaffs_Object *obj;
+	unsigned char *pg_buf;
+	int ret;
+
+	yaffs_Device *dev;
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
+		(unsigned)(pg->index << PAGE_CACHE_SHIFT),
+		(unsigned)PAGE_CACHE_SIZE));
+
+	obj = yaffs_DentryToObject(f->f_dentry);
+
+	dev = obj->myDev;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+	BUG_ON(!PageLocked(pg));
+#else
+	if (!PageLocked(pg))
+		PAGE_BUG(pg);
+#endif
+
+	pg_buf = kmap(pg);
+	/* FIXME: Can kmap fail? */
+
+	yaffs_GrossLock(dev);
+
+	ret = yaffs_ReadDataFromFile(obj, pg_buf,
+				pg->index << PAGE_CACHE_SHIFT,
+				PAGE_CACHE_SIZE);
+
+	yaffs_GrossUnlock(dev);
+
+	if (ret >= 0)
+		ret = 0;
+
+	if (ret) {
+		ClearPageUptodate(pg);
+		SetPageError(pg);
+	} else {
+		SetPageUptodate(pg);
+		ClearPageError(pg);
+	}
+
+	flush_dcache_page(pg);
+	kunmap(pg);
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
+	return ret;
+}
+
+static int yaffs_readpage_unlock(struct file *f, struct page *pg)
+{
+	int ret = yaffs_readpage_nolock(f, pg);
+	UnlockPage(pg);
+	return ret;
+}
+
+static int yaffs_readpage(struct file *f, struct page *pg)
+{
+	int ret;
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
+	ret=yaffs_readpage_unlock(f, pg);
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
+	return ret;
+}
+
+/* writepage inspired by/stolen from smbfs */
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
+#else
+static int yaffs_writepage(struct page *page)
+#endif
+{
+	yaffs_Device *dev;
+	struct address_space *mapping = page->mapping;
+	struct inode *inode;
+	unsigned long end_index;
+	char *buffer;
+	yaffs_Object *obj;
+	int nWritten = 0;
+	unsigned nBytes;
+	loff_t i_size;
+
+	if (!mapping)
+		BUG();
+	inode = mapping->host;
+	if (!inode)
+		BUG();
+	i_size = i_size_read(inode);
+
+	end_index = i_size >> PAGE_CACHE_SHIFT;
+
+	if(page->index < end_index)
+		nBytes = PAGE_CACHE_SIZE;
+	else {
+		nBytes = i_size & (PAGE_CACHE_SIZE -1);
+
+		if (page->index > end_index || !nBytes) {
+			T(YAFFS_TRACE_OS,
+				(TSTR("yaffs_writepage at %08x, inode size = %08x!!!\n"),
+				(unsigned)(page->index << PAGE_CACHE_SHIFT),
+				(unsigned)inode->i_size));
+			T(YAFFS_TRACE_OS,
+				(TSTR("                -> don't care!!\n")));
+
+			zero_user_segment(page,0,PAGE_CACHE_SIZE);
+			set_page_writeback(page);
+			unlock_page(page);
+			end_page_writeback(page);
+			return 0;
+		}
+	}
+
+	if(nBytes != PAGE_CACHE_SIZE)
+		zero_user_segment(page,nBytes,PAGE_CACHE_SIZE);
+
+	get_page(page);
+
+	buffer = kmap(page);
+
+	obj = yaffs_InodeToObject(inode);
+	dev = obj->myDev;
+	yaffs_GrossLock(dev);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_writepage at %08x, size %08x\n"),
+		(unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
+	T(YAFFS_TRACE_OS,
+		(TSTR("writepag0: obj = %05x, ino = %05x\n"),
+		(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
+
+	nWritten = yaffs_WriteDataToFile(obj, buffer,
+			page->index << PAGE_CACHE_SHIFT, nBytes, 0);
+
+	yaffs_MarkSuperBlockDirty(dev);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("writepag1: obj = %05x, ino = %05x\n"),
+		(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
+
+	yaffs_GrossUnlock(dev);
+
+	kunmap(page);
+	set_page_writeback(page);
+	unlock_page(page);
+	end_page_writeback(page);
+	put_page(page);
+
+	return (nWritten == nBytes) ? 0 : -ENOSPC;
+}
+
+
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
+				loff_t pos, unsigned len, unsigned flags,
+				struct page **pagep, void **fsdata)
+{
+	struct page *pg = NULL;
+	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+
+	int ret = 0;
+	int space_held = 0;
+
+	/* Get a page */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
+	pg = grab_cache_page_write_begin(mapping, index, flags);
+#else
+	pg = __grab_cache_page(mapping, index);
+#endif
+
+	*pagep = pg;
+	if (!pg) {
+		ret =  -ENOMEM;
+		goto out;
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
+		(int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
+
+	/* Get fs space */
+	space_held = yaffs_hold_space(filp);
+
+	if (!space_held) {
+		ret = -ENOSPC;
+		goto out;
+	}
+
+	/* Update page if required */
+
+	if (!Page_Uptodate(pg))
+		ret = yaffs_readpage_nolock(filp, pg);
+
+	if (ret)
+		goto out;
+
+	/* Happy path return */
+	T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
+
+	return 0;
+
+out:
+	T(YAFFS_TRACE_OS,
+		(TSTR("end yaffs_write_begin fail returning %d\n"), ret));
+	if (space_held)
+		yaffs_release_space(filp);
+	if (pg) {
+		unlock_page(pg);
+		page_cache_release(pg);
+	}
+	return ret;
+}
+
+#else
+
+static int yaffs_prepare_write(struct file *f, struct page *pg,
+				unsigned offset, unsigned to)
+{
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_prepair_write\n")));
+
+	if (!Page_Uptodate(pg))
+		return yaffs_readpage_nolock(f, pg);
+	return 0;
+}
+#endif
+
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+				loff_t pos, unsigned len, unsigned copied,
+				struct page *pg, void *fsdadata)
+{
+	int ret = 0;
+	void *addr, *kva;
+	uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
+
+	kva = kmap(pg);
+	addr = kva + offset_into_page;
+
+	T(YAFFS_TRACE_OS,
+		("yaffs_write_end addr %p pos %x nBytes %d\n",
+		addr,(unsigned)pos, copied));
+
+	ret = yaffs_file_write(filp, addr, copied, &pos);
+
+	if (ret != copied) {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_write_end not same size ret %d  copied %d\n"),
+			ret, copied));
+		SetPageError(pg);
+	} else {
+		/* Nothing */
+	}
+
+	kunmap(pg);
+
+	yaffs_release_space(filp);
+	unlock_page(pg);
+	page_cache_release(pg);
+	return ret;
+}
+#else
+
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
+				unsigned to)
+{
+	void *addr, *kva;
+
+	loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
+	int nBytes = to - offset;
+	int nWritten;
+
+	unsigned spos = pos;
+	unsigned saddr;
+
+	kva = kmap(pg);
+	addr = kva + offset;
+
+	saddr = (unsigned) addr;
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_commit_write addr %x pos %x nBytes %d\n"),
+		saddr, spos, nBytes));
+
+	nWritten = yaffs_file_write(f, addr, nBytes, &pos);
+
+	if (nWritten != nBytes) {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_commit_write not same size nWritten %d  nBytes %d\n"),
+			nWritten, nBytes));
+		SetPageError(pg);
+	} else {
+		/* Nothing */
+	}
+
+	kunmap(pg);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_commit_write returning %d\n"),
+		nWritten == nBytes ? 0 : nWritten));
+
+	return nWritten == nBytes ? 0 : nWritten;
+}
+#endif
+
+
+static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
+{
+	if (inode && obj) {
+
+
+		/* Check mode against the variant type and attempt to repair if broken. */
+		__u32 mode = obj->yst_mode;
+		switch (obj->variantType) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			if (!S_ISREG(mode)) {
+				obj->yst_mode &= ~S_IFMT;
+				obj->yst_mode |= S_IFREG;
+			}
+
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			if (!S_ISLNK(mode)) {
+				obj->yst_mode &= ~S_IFMT;
+				obj->yst_mode |= S_IFLNK;
+			}
+
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			if (!S_ISDIR(mode)) {
+				obj->yst_mode &= ~S_IFMT;
+				obj->yst_mode |= S_IFDIR;
+			}
+
+			break;
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+		default:
+			/* TODO? */
+			break;
+		}
+
+		inode->i_flags |= S_NOATIME;
+
+		inode->i_ino = obj->objectId;
+		inode->i_mode = obj->yst_mode;
+		inode->i_uid = obj->yst_uid;
+		inode->i_gid = obj->yst_gid;
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
+		inode->i_blksize = inode->i_sb->s_blocksize;
+#endif
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+		inode->i_rdev = old_decode_dev(obj->yst_rdev);
+		inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
+		inode->i_atime.tv_nsec = 0;
+		inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
+		inode->i_mtime.tv_nsec = 0;
+		inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
+		inode->i_ctime.tv_nsec = 0;
+#else
+		inode->i_rdev = obj->yst_rdev;
+		inode->i_atime = obj->yst_atime;
+		inode->i_mtime = obj->yst_mtime;
+		inode->i_ctime = obj->yst_ctime;
+#endif
+		inode->i_size = yaffs_GetObjectFileLength(obj);
+		inode->i_blocks = (inode->i_size + 511) >> 9;
+
+		inode->i_nlink = yaffs_GetObjectLinkCount(obj);
+
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n"),
+			inode->i_mode, inode->i_uid, inode->i_gid,
+			(int)inode->i_size, atomic_read(&inode->i_count)));
+
+		switch (obj->yst_mode & S_IFMT) {
+		default:	/* fifo, device or socket */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+			init_special_inode(inode, obj->yst_mode,
+					old_decode_dev(obj->yst_rdev));
+#else
+			init_special_inode(inode, obj->yst_mode,
+					(dev_t) (obj->yst_rdev));
+#endif
+			break;
+		case S_IFREG:	/* file */
+			inode->i_op = &yaffs_file_inode_operations;
+			inode->i_fop = &yaffs_file_operations;
+			inode->i_mapping->a_ops =
+				&yaffs_file_address_operations;
+			break;
+		case S_IFDIR:	/* directory */
+			inode->i_op = &yaffs_dir_inode_operations;
+			inode->i_fop = &yaffs_dir_operations;
+			break;
+		case S_IFLNK:	/* symlink */
+			inode->i_op = &yaffs_symlink_inode_operations;
+			break;
+		}
+
+		yaffs_InodeToObjectLV(inode) = obj;
+
+		obj->myInode = inode;
+
+	} else {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_FileInode invalid parameters\n")));
+	}
+
+}
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+				yaffs_Object *obj)
+{
+	struct inode *inode;
+
+	if (!sb) {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_get_inode for NULL super_block!!\n")));
+		return NULL;
+
+	}
+
+	if (!obj) {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_get_inode for NULL object!!\n")));
+		return NULL;
+
+	}
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_get_inode for object %d\n"), obj->objectId));
+
+	inode = Y_IGET(sb, obj->objectId);
+	if (IS_ERR(inode))
+		return NULL;
+
+	/* NB Side effect: iget calls back to yaffs_read_inode(). */
+	/* iget also increments the inode's i_count */
+	/* NB You can't be holding grossLock or deadlock will happen! */
+
+	return inode;
+}
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+				loff_t *pos)
+{
+	yaffs_Object *obj;
+	int nWritten, ipos;
+	struct inode *inode;
+	yaffs_Device *dev;
+
+	obj = yaffs_DentryToObject(f->f_dentry);
+
+	dev = obj->myDev;
+
+	yaffs_GrossLock(dev);
+
+	inode = f->f_dentry->d_inode;
+
+	if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
+		ipos = inode->i_size;
+	else
+		ipos = *pos;
+
+	if (!obj)
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_file_write: hey obj is null!\n")));
+	else
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_file_write about to write writing %u(%x) bytes"
+			"to object %d at %d(%x)\n"),
+			(unsigned) n, (unsigned) n, obj->objectId, ipos,ipos));
+
+	nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
+
+	yaffs_MarkSuperBlockDirty(dev);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_file_write: %d(%x) bytes written\n"),
+		(unsigned )n,(unsigned)n));
+
+	if (nWritten > 0) {
+		ipos += nWritten;
+		*pos = ipos;
+		if (ipos > inode->i_size) {
+			inode->i_size = ipos;
+			inode->i_blocks = (ipos + 511) >> 9;
+
+			T(YAFFS_TRACE_OS,
+				(TSTR("yaffs_file_write size updated to %d bytes, "
+				"%d blocks\n"),
+				ipos, (int)(inode->i_blocks)));
+		}
+
+	}
+	yaffs_GrossUnlock(dev);
+	return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
+}
+
+/* Space holding and freeing is done to ensure we have space available for write_begin/end */
+/* For now we just assume few parallel writes and check against a small number. */
+/* Todo: need to do this with a counter to handle parallel reads better */
+
+static ssize_t yaffs_hold_space(struct file *f)
+{
+	yaffs_Object *obj;
+	yaffs_Device *dev;
+
+	int nFreeChunks;
+
+
+	obj = yaffs_DentryToObject(f->f_dentry);
+
+	dev = obj->myDev;
+
+	yaffs_GrossLock(dev);
+
+	nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
+
+	yaffs_GrossUnlock(dev);
+
+	return (nFreeChunks > 20) ? 1 : 0;
+}
+
+static void yaffs_release_space(struct file *f)
+{
+	yaffs_Object *obj;
+	yaffs_Device *dev;
+
+
+	obj = yaffs_DentryToObject(f->f_dentry);
+
+	dev = obj->myDev;
+
+	yaffs_GrossLock(dev);
+
+
+	yaffs_GrossUnlock(dev);
+}
+
+
+static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
+{
+	long long retval;
+
+	lock_kernel();
+
+	switch (origin){
+	case 2:
+		offset += i_size_read(file->f_path.dentry->d_inode);
+		break;
+	case 1:
+		offset += file->f_pos;
+	}
+	retval = -EINVAL;
+
+	if (offset >= 0){
+		if (offset != file->f_pos)
+			file->f_pos = offset;
+
+		retval = offset;
+	}
+	unlock_kernel();
+	return retval;
+}
+
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+	yaffs_Object *obj;
+	yaffs_Device *dev;
+        struct yaffs_SearchContext *sc;
+	struct inode *inode = f->f_dentry->d_inode;
+	unsigned long offset, curoffs;
+	yaffs_Object *l;
+        int retVal = 0;
+
+	char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+	obj = yaffs_DentryToObject(f->f_dentry);
+	dev = obj->myDev;
+
+	yaffs_GrossLock(dev);
+
+	yaffs_DeviceToLC(dev)->readdirProcess = current;
+
+	offset = f->f_pos;
+
+        sc = yaffs_NewSearch(obj);
+        if(!sc){
+                retVal = -ENOMEM;
+                goto out;
+        }
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
+
+	if (offset == 0) {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_readdir: entry . ino %d \n"),
+			(int)inode->i_ino));
+		yaffs_GrossUnlock(dev);
+		if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0){
+			yaffs_GrossLock(dev);
+			goto out;
+		}
+		yaffs_GrossLock(dev);
+		offset++;
+		f->f_pos++;
+	}
+	if (offset == 1) {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_readdir: entry .. ino %d \n"),
+			(int)f->f_dentry->d_parent->d_inode->i_ino));
+		yaffs_GrossUnlock(dev);
+		if (filldir(dirent, "..", 2, offset,
+			f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0){
+			yaffs_GrossLock(dev);
+			goto out;
+		}
+		yaffs_GrossLock(dev);
+		offset++;
+		f->f_pos++;
+	}
+
+	curoffs = 1;
+
+	/* If the directory has changed since the open or last call to
+	   readdir, rewind to after the 2 canned entries. */
+	if (f->f_version != inode->i_version) {
+		offset = 2;
+		f->f_pos = offset;
+		f->f_version = inode->i_version;
+	}
+
+	while(sc->nextReturn){
+		curoffs++;
+                l = sc->nextReturn;
+		if (curoffs >= offset) {
+                        int this_inode = yaffs_GetObjectInode(l);
+                        int this_type = yaffs_GetObjectType(l);
+
+			yaffs_GetObjectName(l, name,
+					    YAFFS_MAX_NAME_LENGTH + 1);
+			T(YAFFS_TRACE_OS,
+			  (TSTR("yaffs_readdir: %s inode %d\n"),
+			  name, yaffs_GetObjectInode(l)));
+
+                        yaffs_GrossUnlock(dev);
+
+			if (filldir(dirent,
+					name,
+					strlen(name),
+					offset,
+					this_inode,
+					this_type) < 0){
+				yaffs_GrossLock(dev);
+				goto out;
+			}
+
+                        yaffs_GrossLock(dev);
+
+			offset++;
+			f->f_pos++;
+		}
+                yaffs_SearchAdvance(sc);
+	}
+
+out:
+	yaffs_EndSearch(sc);
+	yaffs_DeviceToLC(dev)->readdirProcess = NULL;
+	yaffs_GrossUnlock(dev);
+
+	return retVal;
+}
+
+
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+#define YCRED(x) x
+#else
+#define YCRED(x) (x->cred)
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+			dev_t rdev)
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+			int rdev)
+#endif
+{
+	struct inode *inode;
+
+	yaffs_Object *obj = NULL;
+	yaffs_Device *dev;
+
+	yaffs_Object *parent = yaffs_InodeToObject(dir);
+
+	int error = -ENOSPC;
+	uid_t uid = YCRED(current)->fsuid;
+	gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
+
+	if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
+		mode |= S_ISGID;
+
+	if (parent) {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_mknod: parent object %d type %d\n"),
+			parent->objectId, parent->variantType));
+	} else {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_mknod: could not get parent object\n")));
+		return -EPERM;
+	}
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
+			"mode %x dev %x\n"),
+			dentry->d_name.name, mode, rdev));
+
+	dev = parent->myDev;
+
+	yaffs_GrossLock(dev);
+
+	switch (mode & S_IFMT) {
+	default:
+		/* Special (socket, fifo, device...) */
+		T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+		obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
+				gid, old_encode_dev(rdev));
+#else
+		obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
+				gid, rdev);
+#endif
+		break;
+	case S_IFREG:		/* file          */
+		T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
+		obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
+				gid);
+		break;
+	case S_IFDIR:		/* directory */
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_mknod: making directory\n")));
+		obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
+					uid, gid);
+		break;
+	case S_IFLNK:		/* symlink */
+		T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
+		obj = NULL;	/* Do we ever get here? */
+		break;
+	}
+
+	/* Can not call yaffs_get_inode() with gross lock held */
+	yaffs_GrossUnlock(dev);
+
+	if (obj) {
+		inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+		d_instantiate(dentry, inode);
+		update_dir_time(dir);
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_mknod created object %d count = %d\n"),
+			obj->objectId, atomic_read(&inode->i_count)));
+		error = 0;
+		yaffs_FillInodeFromObject(dir,parent);
+	} else {
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_mknod failed making object\n")));
+		error = -ENOMEM;
+	}
+
+	return error;
+}
+
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+	int retVal;
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
+	retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+	return retVal;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+			struct nameidata *n)
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
+#endif
+{
+	T(YAFFS_TRACE_OS,(TSTR("yaffs_create\n")));
+	return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int retVal;
+
+	yaffs_Device *dev;
+	yaffs_Object *obj;
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_unlink %d:%s\n"),
+		(int)(dir->i_ino),
+		dentry->d_name.name));
+	obj = yaffs_InodeToObject(dir);
+	dev = obj->myDev;
+
+	yaffs_GrossLock(dev);
+
+	retVal = yaffs_Unlink(obj, dentry->d_name.name);
+
+	if (retVal == YAFFS_OK) {
+		dentry->d_inode->i_nlink--;
+		dir->i_version++;
+		yaffs_GrossUnlock(dev);
+		mark_inode_dirty(dentry->d_inode);
+		update_dir_time(dir);
+		return 0;
+	}
+	yaffs_GrossUnlock(dev);
+	return -ENOTEMPTY;
+}
+
+/*
+ * Create a link...
+ */
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+			struct dentry *dentry)
+{
+	struct inode *inode = old_dentry->d_inode;
+	yaffs_Object *obj = NULL;
+	yaffs_Object *link = NULL;
+	yaffs_Device *dev;
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
+
+	obj = yaffs_InodeToObject(inode);
+	dev = obj->myDev;
+
+	yaffs_GrossLock(dev);
+
+	if (!S_ISDIR(inode->i_mode))		/* Don't link directories */
+		link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
+			obj);
+
+	if (link) {
+		old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
+		d_instantiate(dentry, old_dentry->d_inode);
+		atomic_inc(&old_dentry->d_inode->i_count);
+		T(YAFFS_TRACE_OS,
+			(TSTR("yaffs_link link count %d i_count %d\n"),
+			old_dentry->d_inode->i_nlink,
+			atomic_read(&old_dentry->d_inode->i_count)));
+	}
+
+	yaffs_GrossUnlock(dev);
+
+	if (link){
+		update_dir_time(dir);
+		return 0;
+	}
+
+	return -EPERM;
+}
+
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+				const char *symname)
+{
+	yaffs_Object *obj;
+	yaffs_Device *dev;
+	uid_t uid = YCRED(current)->fsuid;
+	gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
+
+	dev = yaffs_InodeToObject(dir)->myDev;
+	yaffs_GrossLock(dev);
+	obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
+				S_IFLNK | S_IRWXUGO, uid, gid, symname);
+	yaffs_GrossUnlock(dev);
+
+	if (obj) {
+		struct inode *inode;
+
+		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+		d_instantiate(dentry, inode);
+		update_dir_time(dir);
+		T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
+		return 0;
+	} else {
+		T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
+	}
+
+	return -ENOMEM;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+static int yaffs_sync_object(struct file *file, int datasync)
+#else
+static int yaffs_sync_object(struct file *file, struct dentry *dentry,
+				int datasync)
+#endif
+{
+
+	yaffs_Object *obj;
+	yaffs_Device *dev;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+	struct dentry *dentry = file->f_path.dentry;
+#endif
+
+	obj = yaffs_DentryToObject(dentry);
+
+	dev = obj->myDev;
+
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+		(TSTR("yaffs_sync_object\n")));
+	yaffs_GrossLock(dev);
+	yaffs_FlushFile(obj, 1, datasync);
+	yaffs_GrossUnlock(dev);
+	return 0;
+}
+
+/*
+ * The VFS layer already does all the dentry stuff for rename.
+ *
+ * NB: POSIX says you can rename an object over an old object of the same name
+ */
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry)
+{
+	yaffs_Device *dev;
+	int retVal = YAFFS_FAIL;
+	yaffs_Object *target;
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
+	dev = yaffs_InodeToObject(old_dir)->myDev;
+
+	yaffs_GrossLock(dev);
+
+	/* Check if the target is an existing directory that is not empty. */
+	target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
+				new_dentry->d_name.name);
+
+
+
+	if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+		!ylist_empty(&target->variant.directoryVariant.children)) {
+
+		T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
+
+		retVal = YAFFS_FAIL;
+	} else {
+		/* Now does unlinking internally using shadowing mechanism */
+		T(YAFFS_TRACE_OS, (TSTR("calling yaffs_RenameObject\n")));
+
+		retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
+				old_dentry->d_name.name,
+				yaffs_InodeToObject(new_dir),
+				new_dentry->d_name.name);
+	}
+	yaffs_GrossUnlock(dev);
+
+	if (retVal == YAFFS_OK) {
+		if (target) {
+			new_dentry->d_inode->i_nlink--;
+			mark_inode_dirty(new_dentry->d_inode);
+		}
+		
+		update_dir_time(old_dir);
+		if(old_dir != new_dir)
+			update_dir_time(new_dir);
+		return 0;
+	} else {
+		return -ENOTEMPTY;
+	}
+}
+
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_setattr of object %d\n"),
+		yaffs_InodeToObject(inode)->objectId));
+
+	/* Fail if a requested resize >= 2GB */		
+	if (attr->ia_valid & ATTR_SIZE &&
+		(attr->ia_size >> 31))
+		error = -EINVAL;
+
+	if (error == 0)
+		error = inode_change_ok(inode, attr);
+	if (error == 0) {
+		int result;
+		if (!error){
+			error = yaffs_vfs_setattr(inode, attr);
+			T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
+			if (attr->ia_valid & ATTR_SIZE){
+                        	yaffs_vfs_setsize(inode,attr->ia_size);
+                        	inode->i_blocks = (inode->i_size + 511) >> 9;
+			}
+		}
+		dev = yaffs_InodeToObject(inode)->myDev;
+		if (attr->ia_valid & ATTR_SIZE){
+			T(YAFFS_TRACE_OS,(TSTR("resize to %d(%x)\n"),
+				(int)(attr->ia_size),(int)(attr->ia_size)));
+		}
+		yaffs_GrossLock(dev);
+		result = yaffs_SetAttributes(yaffs_InodeToObject(inode), attr);
+		if(result == YAFFS_OK) {
+			error = 0;
+		} else {
+			error = -EPERM;
+		}
+		yaffs_GrossUnlock(dev);
+
+	}
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_setattr done returning %d\n"),error));
+
+	return error;
+}
+
+#ifdef CONFIG_YAFFS_XATTR
+int yaffs_setxattr(struct dentry *dentry, const char *name,
+			const void *value, size_t size, int flags)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_setxattr of object %d\n"),
+		obj->objectId));
+
+
+	if (error == 0) {
+		int result;
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		result = yaffs_SetXAttribute(obj, name, value, size, flags);
+		if(result == YAFFS_OK)
+			error = 0;
+		else if(result < 0)
+			error = result;
+		yaffs_GrossUnlock(dev);
+
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_setxattr done returning %d\n"),error));
+
+	return error;
+}
+
+
+ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
+			size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_getxattr \"%s\" from object %d\n"),
+		name, obj->objectId));
+
+	if (error == 0) {
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		error = yaffs_GetXAttribute(obj, name, buff, size);
+		yaffs_GrossUnlock(dev);
+
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_getxattr done returning %d\n"),error));
+
+	return error;
+}
+
+int yaffs_removexattr(struct dentry *dentry, const char *name)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_removexattr of object %d\n"),
+		obj->objectId));
+
+
+	if (error == 0) {
+		int result;
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		result = yaffs_RemoveXAttribute(obj, name);
+		if(result == YAFFS_OK)
+			error = 0;
+		else if(result < 0)
+			error = result;
+		yaffs_GrossUnlock(dev);
+
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_removexattr done returning %d\n"),error));
+
+	return error;
+}
+
+ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_listxattr of object %d\n"),
+		obj->objectId));
+
+
+	if (error == 0) {
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		error = yaffs_ListXAttributes(obj, buff, size);
+		yaffs_GrossUnlock(dev);
+
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_listxattr done returning %d\n"),error));
+
+	return error;
+}
+
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+	struct super_block *sb = dentry->d_sb;
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+	yaffs_Device *dev = yaffs_SuperToDevice(sb);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
+{
+	yaffs_Device *dev = yaffs_SuperToDevice(sb);
+#endif
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
+
+	yaffs_GrossLock(dev);
+
+	buf->f_type = YAFFS_MAGIC;
+	buf->f_bsize = sb->s_blocksize;
+	buf->f_namelen = 255;
+
+	if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
+		/* Do this if chunk size is not a power of 2 */
+
+		uint64_t bytesInDev;
+		uint64_t bytesFree;
+
+		bytesInDev = ((uint64_t)((dev->param.endBlock - dev->param.startBlock + 1))) *
+			((uint64_t)(dev->param.nChunksPerBlock * dev->nDataBytesPerChunk));
+
+		do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
+		buf->f_blocks = bytesInDev;
+
+		bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
+			((uint64_t)(dev->nDataBytesPerChunk));
+
+		do_div(bytesFree, sb->s_blocksize);
+
+		buf->f_bfree = bytesFree;
+
+	} else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
+
+		buf->f_blocks =
+			(dev->param.endBlock - dev->param.startBlock + 1) *
+			dev->param.nChunksPerBlock /
+			(sb->s_blocksize / dev->nDataBytesPerChunk);
+		buf->f_bfree =
+			yaffs_GetNumberOfFreeChunks(dev) /
+			(sb->s_blocksize / dev->nDataBytesPerChunk);
+	} else {
+		buf->f_blocks =
+			(dev->param.endBlock - dev->param.startBlock + 1) *
+			dev->param.nChunksPerBlock *
+			(dev->nDataBytesPerChunk / sb->s_blocksize);
+
+		buf->f_bfree =
+			yaffs_GetNumberOfFreeChunks(dev) *
+			(dev->nDataBytesPerChunk / sb->s_blocksize);
+	}
+
+	buf->f_files = 0;
+	buf->f_ffree = 0;
+	buf->f_bavail = buf->f_bfree;
+
+	yaffs_GrossUnlock(dev);
+	return 0;
+}
+
+
+
+static void yaffs_FlushInodes(struct super_block *sb)
+{
+	struct inode *iptr;
+	yaffs_Object *obj;
+	
+	list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
+		obj = yaffs_InodeToObject(iptr);
+		if(obj){
+			T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
+				obj->objectId));
+			yaffs_FlushFile(obj,1,0);
+		}
+	}
+}
+
+
+static void yaffs_FlushSuperBlock(struct super_block *sb, int do_checkpoint)
+{
+	yaffs_Device *dev = yaffs_SuperToDevice(sb);	
+	if(!dev)
+		return;
+	
+	yaffs_FlushInodes(sb);
+	yaffs_UpdateDirtyDirectories(dev);
+	yaffs_FlushEntireDeviceCache(dev);
+	if(do_checkpoint)
+		yaffs_CheckpointSave(dev);
+}
+
+
+static unsigned yaffs_bg_gc_urgency(yaffs_Device *dev)
+{
+	unsigned erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
+	struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+	unsigned scatteredFree = 0; /* Free chunks not in an erased block */
+
+	if(erasedChunks < dev->nFreeChunks)
+		scatteredFree = (dev->nFreeChunks - erasedChunks);
+
+	if(!context->bgRunning)
+		return 0;
+	else if(scatteredFree < (dev->param.nChunksPerBlock * 2))
+		return 0;
+	else if(erasedChunks > dev->nFreeChunks/2)
+		return 0;
+	else if(erasedChunks > dev->nFreeChunks/4)
+		return 1;
+	else
+		return 2;
+}
+
+static int yaffs_do_sync_fs(struct super_block *sb,
+				int request_checkpoint)
+{
+
+	yaffs_Device *dev = yaffs_SuperToDevice(sb);
+	unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+	unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+	int do_checkpoint;
+
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+		(TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
+		gc_urgent,
+		sb->s_dirt ? "dirty" : "clean",
+		request_checkpoint ? "checkpoint requested" : "no checkpoint",
+		oneshot_checkpoint ? " one-shot" : "" ));
+
+	yaffs_GrossLock(dev);
+	do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+			oneshot_checkpoint) &&
+			!dev->isCheckpointed;
+
+	if (sb->s_dirt || do_checkpoint) {
+		yaffs_FlushSuperBlock(sb, !dev->isCheckpointed && do_checkpoint);
+		sb->s_dirt = 0;
+		if(oneshot_checkpoint)
+			yaffs_auto_checkpoint &= ~4;
+	}
+	yaffs_GrossUnlock(dev);
+
+	return 0;
+}
+
+/*
+ * yaffs background thread functions .
+ * yaffs_BackgroundThread() the thread function
+ * yaffs_BackgroundStart() launches the background thread.
+ * yaffs_BackgroundStop() cleans up the background thread.
+ *
+ * NB: 
+ * The thread should only run after the yaffs is initialised
+ * The thread should be stopped before yaffs is unmounted.
+ * The thread should not do any writing while the fs is in read only.
+ */
+
+#ifdef YAFFS_COMPILE_BACKGROUND
+
+void yaffs_background_waker(unsigned long data)
+{
+	wake_up_process((struct task_struct *)data);
+}
+
+static int yaffs_BackgroundThread(void *data)
+{
+	yaffs_Device *dev = (yaffs_Device *)data;
+	struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+	unsigned long now = jiffies;
+	unsigned long next_dir_update = now;
+	unsigned long next_gc = now;
+	unsigned long expires;
+	unsigned int urgency;
+
+	int gcResult;
+	struct timer_list timer;
+
+	T(YAFFS_TRACE_BACKGROUND,
+		(TSTR("yaffs_background starting for dev %p\n"),
+		(void *)dev));
+
+#ifdef YAFFS_COMPILE_FREEZER
+	set_freezable();
+#endif
+	while(context->bgRunning){
+		T(YAFFS_TRACE_BACKGROUND,
+			(TSTR("yaffs_background\n")));
+
+		if(kthread_should_stop())
+			break;
+
+#ifdef YAFFS_COMPILE_FREEZER
+		if(try_to_freeze())
+			continue;
+#endif
+		yaffs_GrossLock(dev);
+
+		now = jiffies;
+
+		if(time_after(now, next_dir_update) && yaffs_bg_enable){
+			yaffs_UpdateDirtyDirectories(dev);
+			next_dir_update = now + HZ;
+		}
+
+		if(time_after(now,next_gc) && yaffs_bg_enable){
+			if(!dev->isCheckpointed){
+				urgency = yaffs_bg_gc_urgency(dev);
+				gcResult = yaffs_BackgroundGarbageCollect(dev, urgency);
+				if(urgency > 1)
+					next_gc = now + HZ/20+1;
+				else if(urgency > 0)
+					next_gc = now + HZ/10+1;
+				else
+					next_gc = now + HZ * 2;
+			} else /*
+				* gc not running so set to next_dir_update
+				* to cut down on wake ups
+				*/
+				next_gc = next_dir_update;
+		}
+		yaffs_GrossUnlock(dev);
+#if 1
+		expires = next_dir_update;
+		if (time_before(next_gc,expires))
+			expires = next_gc;
+		if(time_before(expires,now))
+			expires = now + HZ;
+
+		Y_INIT_TIMER(&timer);
+		timer.expires = expires+1;
+		timer.data = (unsigned long) current;
+		timer.function = yaffs_background_waker;
+
+                set_current_state(TASK_INTERRUPTIBLE);
+		add_timer(&timer);
+		schedule();
+		del_timer_sync(&timer);
+#else
+		msleep(10);
+#endif
+	}
+
+	return 0;
+}
+
+static int yaffs_BackgroundStart(yaffs_Device *dev)
+{
+	int retval = 0;
+	struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+
+	if(dev->readOnly)
+		return -1;
+
+	context->bgRunning = 1;
+
+	context->bgThread = kthread_run(yaffs_BackgroundThread,
+	                        (void *)dev,"yaffs-bg-%d",context->mount_id);
+
+	if(IS_ERR(context->bgThread)){
+		retval = PTR_ERR(context->bgThread);
+		context->bgThread = NULL;
+		context->bgRunning = 0;
+	}
+	return retval;
+}
+
+static void yaffs_BackgroundStop(yaffs_Device *dev)
+{
+	struct yaffs_LinuxContext *ctxt = yaffs_DeviceToLC(dev);
+
+	ctxt->bgRunning = 0;
+
+	if( ctxt->bgThread){
+		kthread_stop(ctxt->bgThread);
+		ctxt->bgThread = NULL;
+	}
+}
+#else
+static int yaffs_BackgroundThread(void *data)
+{
+	return 0;
+}
+
+static int yaffs_BackgroundStart(yaffs_Device *dev)
+{
+	return 0;
+}
+
+static void yaffs_BackgroundStop(yaffs_Device *dev)
+{
+}
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static void yaffs_write_super(struct super_block *sb)
+#else
+static int yaffs_write_super(struct super_block *sb)
+#endif
+{
+	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
+
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+		(TSTR("yaffs_write_super%s\n"),
+		request_checkpoint ? " checkpt" : ""));
+
+	yaffs_do_sync_fs(sb, request_checkpoint);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
+	return 0;
+#endif
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_sync_fs(struct super_block *sb, int wait)
+#else
+static int yaffs_sync_fs(struct super_block *sb)
+#endif
+{
+	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
+
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+		(TSTR("yaffs_sync_fs%s\n"),
+		request_checkpoint ? " checkpt" : ""));
+
+	yaffs_do_sync_fs(sb, request_checkpoint);
+
+	return 0;
+}
+
+#ifdef YAFFS_USE_OWN_IGET
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
+{
+	struct inode *inode;
+	yaffs_Object *obj;
+	yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_iget for %lu\n"), ino));
+
+	inode = iget_locked(sb, ino);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+	if (!(inode->i_state & I_NEW))
+		return inode;
+
+	/* NB This is called as a side effect of other functions, but
+	 * we had to release the lock to prevent deadlocks, so
+	 * need to lock again.
+	 */
+
+	yaffs_GrossLock(dev);
+
+	obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
+
+	yaffs_FillInodeFromObject(inode, obj);
+
+	yaffs_GrossUnlock(dev);
+
+	unlock_new_inode(inode);
+	return inode;
+}
+
+#else
+
+static void yaffs_read_inode(struct inode *inode)
+{
+	/* NB This is called as a side effect of other functions, but
+	 * we had to release the lock to prevent deadlocks, so
+	 * need to lock again.
+	 */
+
+	yaffs_Object *obj;
+	yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
+
+	if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+		yaffs_GrossLock(dev);
+
+	obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
+
+	yaffs_FillInodeFromObject(inode, obj);
+
+	if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+		yaffs_GrossUnlock(dev);
+}
+
+#endif
+
+static YLIST_HEAD(yaffs_context_list);
+struct semaphore yaffs_context_lock;
+
+static void yaffs_put_super(struct super_block *sb)
+{
+	yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
+
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+		(TSTR("Shutting down yaffs background thread\n")));
+	yaffs_BackgroundStop(dev);
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+		(TSTR("yaffs background thread shut down\n")));
+
+	yaffs_GrossLock(dev);
+
+	yaffs_FlushSuperBlock(sb,1);
+
+	if (yaffs_DeviceToLC(dev)->putSuperFunc)
+		yaffs_DeviceToLC(dev)->putSuperFunc(sb);
+
+
+	yaffs_Deinitialise(dev);
+
+	yaffs_GrossUnlock(dev);
+
+	down(&yaffs_context_lock);
+	ylist_del_init(&(yaffs_DeviceToLC(dev)->contextList));
+	up(&yaffs_context_lock);
+
+	if (yaffs_DeviceToLC(dev)->spareBuffer) {
+		YFREE(yaffs_DeviceToLC(dev)->spareBuffer);
+		yaffs_DeviceToLC(dev)->spareBuffer = NULL;
+	}
+
+	kfree(dev);
+}
+
+
+static void yaffs_MTDPutSuper(struct super_block *sb)
+{
+	struct mtd_info *mtd = yaffs_DeviceToMtd(yaffs_SuperToDevice(sb));
+
+	if (mtd->sync)
+		mtd->sync(mtd);
+
+	put_mtd_device(mtd);
+}
+
+
+static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev)
+{
+	struct super_block *sb = yaffs_DeviceToLC(dev)->superBlock;
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_MarkSuperBlockDirty() sb = %p\n"), sb));
+	if (sb)
+		sb->s_dirt = 1;
+}
+
+typedef struct {
+	int inband_tags;
+	int skip_checkpoint_read;
+	int skip_checkpoint_write;
+	int no_cache;
+	int tags_ecc_on;
+	int tags_ecc_overridden;
+	int lazy_loading_enabled;
+	int lazy_loading_overridden;
+	int empty_lost_and_found;
+	int empty_lost_and_found_overridden;
+} yaffs_options;
+
+#define MAX_OPT_LEN 30
+static int yaffs_parse_options(yaffs_options *options, const char *options_str)
+{
+	char cur_opt[MAX_OPT_LEN + 1];
+	int p;
+	int error = 0;
+
+	/* Parse through the options which is a comma seperated list */
+
+	while (options_str && *options_str && !error) {
+		memset(cur_opt, 0, MAX_OPT_LEN + 1);
+		p = 0;
+
+		while(*options_str == ',')
+			options_str++;
+
+		while (*options_str && *options_str != ',') {
+			if (p < MAX_OPT_LEN) {
+				cur_opt[p] = *options_str;
+				p++;
+			}
+			options_str++;
+		}
+
+		if (!strcmp(cur_opt, "inband-tags"))
+			options->inband_tags = 1;
+		else if (!strcmp(cur_opt, "tags-ecc-off")){
+			options->tags_ecc_on = 0;
+			options->tags_ecc_overridden=1;
+		} else if (!strcmp(cur_opt, "tags-ecc-on")){
+			options->tags_ecc_on = 1;
+			options->tags_ecc_overridden = 1;
+		} else if (!strcmp(cur_opt, "lazy-loading-off")){
+			options->lazy_loading_enabled = 0;
+			options->lazy_loading_overridden=1;
+		} else if (!strcmp(cur_opt, "lazy-loading-on")){
+			options->lazy_loading_enabled = 1;
+			options->lazy_loading_overridden = 1;
+		} else if (!strcmp(cur_opt, "empty-lost-and-found-off")){
+			options->empty_lost_and_found = 0;
+			options->empty_lost_and_found_overridden=1;
+		} else if (!strcmp(cur_opt, "empty-lost-and-found-on")){
+			options->empty_lost_and_found = 1;
+			options->empty_lost_and_found_overridden=1;
+		} else if (!strcmp(cur_opt, "no-cache"))
+			options->no_cache = 1;
+		else if (!strcmp(cur_opt, "no-checkpoint-read"))
+			options->skip_checkpoint_read = 1;
+		else if (!strcmp(cur_opt, "no-checkpoint-write"))
+			options->skip_checkpoint_write = 1;
+		else if (!strcmp(cur_opt, "no-checkpoint")) {
+			options->skip_checkpoint_read = 1;
+			options->skip_checkpoint_write = 1;
+		} else {
+			printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
+					cur_opt);
+			error = 1;
+		}
+	}
+
+	return error;
+}
+
+static struct super_block *yaffs_internal_read_super(int yaffsVersion,
+						struct super_block *sb,
+						void *data, int silent)
+{
+	int nBlocks;
+	struct inode *inode = NULL;
+	struct dentry *root;
+	yaffs_Device *dev = 0;
+	char devname_buf[BDEVNAME_SIZE + 1];
+	struct mtd_info *mtd;
+	int err;
+	char *data_str = (char *)data;
+	struct yaffs_LinuxContext *context = NULL;
+	yaffs_DeviceParam *param;
+
+	int readOnly = 0;
+
+	yaffs_options options;
+
+	unsigned mount_id;
+	int found;
+	struct yaffs_LinuxContext *context_iterator;
+	struct ylist_head *l;
+
+	sb->s_magic = YAFFS_MAGIC;
+	sb->s_op = &yaffs_super_ops;
+	sb->s_flags |= MS_NOATIME;
+
+	readOnly =((sb->s_flags & MS_RDONLY) != 0);
+
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+	sb->s_export_op = &yaffs_export_ops;
+#endif
+
+	if (!sb)
+		printk(KERN_INFO "yaffs: sb is NULL\n");
+	else if (!sb->s_dev)
+		printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
+	else if (!yaffs_devname(sb, devname_buf))
+		printk(KERN_INFO "yaffs: devname is NULL\n");
+	else
+		printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
+		       sb->s_dev,
+		       yaffs_devname(sb, devname_buf),
+		       readOnly ? "ro" : "rw");
+
+	if (!data_str)
+		data_str = "";
+
+	printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
+
+	memset(&options, 0, sizeof(options));
+
+	if (yaffs_parse_options(&options, data_str)) {
+		/* Option parsing failed */
+		return NULL;
+	}
+
+
+	sb->s_blocksize = PAGE_CACHE_SIZE;
+	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_read_super: Using yaffs%d\n"), yaffsVersion));
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_read_super: block size %d\n"),
+		(int)(sb->s_blocksize)));
+
+	T(YAFFS_TRACE_ALWAYS,
+		(TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
+	       MAJOR(sb->s_dev), MINOR(sb->s_dev),
+	       yaffs_devname(sb, devname_buf)));
+
+	/* Check it's an mtd device..... */
+	if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
+		return NULL;	/* This isn't an mtd device */
+
+	/* Get the device */
+	mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+	if (!mtd) {
+		T(YAFFS_TRACE_ALWAYS,
+			(TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
+			MINOR(sb->s_dev)));
+		return NULL;
+	}
+	/* Check it's NAND */
+	if (mtd->type != MTD_NANDFLASH) {
+		T(YAFFS_TRACE_ALWAYS,
+			(TSTR("yaffs: MTD device is not NAND it's type %d\n"),
+			mtd->type));
+		return NULL;
+	}
+
+	T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
+	T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
+	T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
+	T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
+	T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
+	T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
+	T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
+	T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
+	T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
+	T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+	T(YAFFS_TRACE_OS, (TSTR(" size %u\n"), mtd->size));
+#else
+	T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
+#endif
+
+#ifdef CONFIG_YAFFS_AUTO_YAFFS2
+
+	if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
+		T(YAFFS_TRACE_ALWAYS,
+			(TSTR("yaffs: auto selecting yaffs2\n")));
+		yaffsVersion = 2;
+	}
+
+	/* Added NCB 26/5/2006 for completeness */
+	if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
+		T(YAFFS_TRACE_ALWAYS,
+			(TSTR("yaffs: auto selecting yaffs1\n")));
+		yaffsVersion = 1;
+	}
+
+#endif
+
+	if (yaffsVersion == 2) {
+		/* Check for version 2 style functions */
+		if (!mtd->erase ||
+		    !mtd->block_isbad ||
+		    !mtd->block_markbad ||
+		    !mtd->read ||
+		    !mtd->write ||
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+		    !mtd->read_oob || !mtd->write_oob) {
+#else
+		    !mtd->write_ecc ||
+		    !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
+#endif
+			T(YAFFS_TRACE_ALWAYS,
+			  (TSTR("yaffs: MTD device does not support required "
+			   "functions\n")));
+			return NULL;
+		}
+
+		if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+		    mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
+		    !options.inband_tags) {
+			T(YAFFS_TRACE_ALWAYS,
+			  (TSTR("yaffs: MTD device does not have the "
+			   "right page sizes\n")));
+			return NULL;
+		}
+	} else {
+		/* Check for V1 style functions */
+		if (!mtd->erase ||
+		    !mtd->read ||
+		    !mtd->write ||
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+		    !mtd->read_oob || !mtd->write_oob) {
+#else
+		    !mtd->write_ecc ||
+		    !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
+#endif
+			T(YAFFS_TRACE_ALWAYS,
+			  (TSTR("yaffs: MTD device does not support required "
+			   "functions\n")));
+			return NULL;
+		}
+
+		if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
+		    mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
+			T(YAFFS_TRACE_ALWAYS,
+			  (TSTR("yaffs: MTD device does not support have the "
+			   "right page sizes\n")));
+			return NULL;
+		}
+	}
+
+	/* OK, so if we got here, we have an MTD that's NAND and looks
+	 * like it has the right capabilities
+	 * Set the yaffs_Device up for mtd
+	 */
+
+	if (!readOnly && !(mtd->flags & MTD_WRITEABLE)){
+		readOnly = 1;
+		printk(KERN_INFO "yaffs: mtd is read only, setting superblock read only");
+		sb->s_flags |= MS_RDONLY;
+	}
+
+	dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
+	context = kmalloc(sizeof(struct yaffs_LinuxContext),GFP_KERNEL);
+	
+	if(!dev || !context ){
+		if(dev)
+			kfree(dev);
+		if(context)
+			kfree(context);
+		dev = NULL;
+		context = NULL;
+	}
+
+	if (!dev) {
+		/* Deep shit could not allocate device structure */
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs_read_super: Failed trying to allocate "
+		   "yaffs_Device. \n")));
+		return NULL;
+	}
+	memset(dev, 0, sizeof(yaffs_Device));
+	param = &(dev->param);
+
+	memset(context,0,sizeof(struct yaffs_LinuxContext));
+	dev->osContext = context;
+	YINIT_LIST_HEAD(&(context->contextList));
+	context->dev = dev;
+	context->superBlock = sb;
+
+	dev->readOnly = readOnly;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+	sb->s_fs_info = dev;
+#else
+	sb->u.generic_sbp = dev;
+#endif
+	
+	dev->driverContext = mtd;
+	param->name = mtd->name;
+
+	/* Set up the memory size parameters.... */
+
+	nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
+
+	param->startBlock = 0;
+	param->endBlock = nBlocks - 1;
+	param->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
+	param->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
+	param->nReservedBlocks = 5;
+	param->nShortOpCaches = (options.no_cache) ? 0 : 10;
+	param->inbandTags = options.inband_tags;
+
+#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
+	param->disableLazyLoad = 1;
+#endif
+#ifdef CONFIG_YAFFS_XATTR
+	param->enableXattr = 1;
+#endif
+	if(options.lazy_loading_overridden)
+		param->disableLazyLoad = !options.lazy_loading_enabled;
+
+#ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
+	param->noTagsECC = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
+#else
+	param->deferDirectoryUpdate = 1;
+#endif
+
+	if(options.tags_ecc_overridden)
+		param->noTagsECC = !options.tags_ecc_on;
+
+#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
+	param->emptyLostAndFound = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
+	param->refreshPeriod = 0;
+#else
+	param->refreshPeriod = 500;
+#endif
+
+#ifdef CONFIG_YAFFS__ALWAYS_CHECK_CHUNK_ERASED
+	param->alwaysCheckErased = 1;
+#endif
+
+	if(options.empty_lost_and_found_overridden)
+		param->emptyLostAndFound = options.empty_lost_and_found;
+
+	/* ... and the functions. */
+	if (yaffsVersion == 2) {
+		param->writeChunkWithTagsToNAND =
+		    nandmtd2_WriteChunkWithTagsToNAND;
+		param->readChunkWithTagsFromNAND =
+		    nandmtd2_ReadChunkWithTagsFromNAND;
+		param->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
+		param->queryNANDBlock = nandmtd2_QueryNANDBlock;
+		yaffs_DeviceToLC(dev)->spareBuffer = YMALLOC(mtd->oobsize);
+		param->isYaffs2 = 1;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+		param->totalBytesPerChunk = mtd->writesize;
+		param->nChunksPerBlock = mtd->erasesize / mtd->writesize;
+#else
+		param->totalBytesPerChunk = mtd->oobblock;
+		param->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
+#endif
+		nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
+
+		param->startBlock = 0;
+		param->endBlock = nBlocks - 1;
+	} else {
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+		/* use the MTD interface in yaffs_mtdif1.c */
+		param->writeChunkWithTagsToNAND =
+			nandmtd1_WriteChunkWithTagsToNAND;
+		param->readChunkWithTagsFromNAND =
+			nandmtd1_ReadChunkWithTagsFromNAND;
+		param->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
+		param->queryNANDBlock = nandmtd1_QueryNANDBlock;
+#else
+		param->writeChunkToNAND = nandmtd_WriteChunkToNAND;
+		param->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
+#endif
+		param->isYaffs2 = 0;
+	}
+	/* ... and common functions */
+	param->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
+	param->initialiseNAND = nandmtd_InitialiseNAND;
+
+	yaffs_DeviceToLC(dev)->putSuperFunc = yaffs_MTDPutSuper;
+
+	param->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
+	param->gcControl = yaffs_gc_control_callback;
+
+	yaffs_DeviceToLC(dev)->superBlock= sb;
+	
+
+#ifndef CONFIG_YAFFS_DOES_ECC
+	param->useNANDECC = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
+	param->wideTnodesDisabled = 1;
+#endif
+
+	param->skipCheckpointRead = options.skip_checkpoint_read;
+	param->skipCheckpointWrite = options.skip_checkpoint_write;
+
+	down(&yaffs_context_lock);
+	/* Get a mount id */
+	found = 0;
+	for(mount_id=0; ! found; mount_id++){
+		found = 1;
+		ylist_for_each(l,&yaffs_context_list){
+			context_iterator = ylist_entry(l,struct yaffs_LinuxContext,contextList);
+			if(context_iterator->mount_id == mount_id)
+				found = 0;
+		}
+	}
+	context->mount_id = mount_id;
+
+	ylist_add_tail(&(yaffs_DeviceToLC(dev)->contextList), &yaffs_context_list);
+	up(&yaffs_context_lock);
+
+        /* Directory search handling...*/
+        YINIT_LIST_HEAD(&(yaffs_DeviceToLC(dev)->searchContexts));
+        param->removeObjectCallback = yaffs_RemoveObjectCallback;
+
+	init_MUTEX(&(yaffs_DeviceToLC(dev)->grossLock));
+
+	yaffs_GrossLock(dev);
+
+	err = yaffs_GutsInitialise(dev);
+
+	T(YAFFS_TRACE_OS,
+	  (TSTR("yaffs_read_super: guts initialised %s\n"),
+	   (err == YAFFS_OK) ? "OK" : "FAILED"));
+	   
+	if(err == YAFFS_OK)
+		yaffs_BackgroundStart(dev);
+		
+	if(!context->bgThread)
+		param->deferDirectoryUpdate = 0;
+
+
+	/* Release lock before yaffs_get_inode() */
+	yaffs_GrossUnlock(dev);
+
+	/* Create root inode */
+	if (err == YAFFS_OK)
+		inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
+					yaffs_Root(dev));
+
+	if (!inode)
+		return NULL;
+
+	inode->i_op = &yaffs_dir_inode_operations;
+	inode->i_fop = &yaffs_dir_operations;
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
+
+	root = d_alloc_root(inode);
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
+
+	if (!root) {
+		iput(inode);
+		return NULL;
+	}
+	sb->s_root = root;
+	sb->s_dirt = !dev->isCheckpointed;
+	T(YAFFS_TRACE_ALWAYS,
+		(TSTR("yaffs_read_super: isCheckpointed %d\n"),
+		dev->isCheckpointed));
+
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
+	return sb;
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
+					 int silent)
+{
+	return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_read_super(struct file_system_type *fs,
+			    int flags, const char *dev_name,
+			    void *data, struct vfsmount *mnt)
+{
+
+	return get_sb_bdev(fs, flags, dev_name, data,
+			   yaffs_internal_read_super_mtd, mnt);
+}
+#else
+static struct super_block *yaffs_read_super(struct file_system_type *fs,
+					    int flags, const char *dev_name,
+					    void *data)
+{
+
+	return get_sb_bdev(fs, flags, dev_name, data,
+			   yaffs_internal_read_super_mtd);
+}
+#endif
+
+static struct file_system_type yaffs_fs_type = {
+	.owner = THIS_MODULE,
+	.name = "yaffs",
+	.get_sb = yaffs_read_super,
+	.kill_sb = kill_block_super,
+	.fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
+					    int silent)
+{
+	return yaffs_internal_read_super(1, sb, data, silent);
+}
+
+static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
+		      FS_REQUIRES_DEV);
+#endif
+
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
+					  int silent)
+{
+	return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs2_read_super(struct file_system_type *fs,
+			int flags, const char *dev_name, void *data,
+			struct vfsmount *mnt)
+{
+	return get_sb_bdev(fs, flags, dev_name, data,
+			yaffs2_internal_read_super_mtd, mnt);
+}
+#else
+static struct super_block *yaffs2_read_super(struct file_system_type *fs,
+					     int flags, const char *dev_name,
+					     void *data)
+{
+
+	return get_sb_bdev(fs, flags, dev_name, data,
+			   yaffs2_internal_read_super_mtd);
+}
+#endif
+
+static struct file_system_type yaffs2_fs_type = {
+	.owner = THIS_MODULE,
+	.name = "yaffs2",
+	.get_sb = yaffs2_read_super,
+	.kill_sb = kill_block_super,
+	.fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs2_read_super(struct super_block *sb,
+					     void *data, int silent)
+{
+	return yaffs_internal_read_super(2, sb, data, silent);
+}
+
+static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
+		      FS_REQUIRES_DEV);
+#endif
+
+#endif				/* CONFIG_YAFFS_YAFFS2 */
+
+static struct proc_dir_entry *my_proc_entry;
+static struct proc_dir_entry *debug_proc_entry;
+
+static char *yaffs_dump_dev_part0(char *buf, yaffs_Device * dev)
+{
+	buf += sprintf(buf, "startBlock......... %d\n", dev->param.startBlock);
+	buf += sprintf(buf, "endBlock........... %d\n", dev->param.endBlock);
+	buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->param.totalBytesPerChunk);
+	buf += sprintf(buf, "useNANDECC......... %d\n", dev->param.useNANDECC);
+	buf += sprintf(buf, "noTagsECC.......... %d\n", dev->param.noTagsECC);
+	buf += sprintf(buf, "isYaffs2........... %d\n", dev->param.isYaffs2);
+	buf += sprintf(buf, "inbandTags......... %d\n", dev->param.inbandTags);
+	buf += sprintf(buf, "emptyLostAndFound.. %d\n", dev->param.emptyLostAndFound);
+	buf += sprintf(buf, "disableLazyLoad.... %d\n", dev->param.disableLazyLoad);
+	buf += sprintf(buf, "refreshPeriod...... %d\n", dev->param.refreshPeriod);
+	buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->param.nShortOpCaches);
+	buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->param.nReservedBlocks);
+	buf += sprintf(buf, "alwaysCheckErased.. %d\n", dev->param.alwaysCheckErased);
+
+	buf += sprintf(buf, "\n");
+
+	return buf;
+}
+
+
+static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
+{
+	buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
+	buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
+	buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
+	buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
+	buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
+	buf += sprintf(buf, "\n");
+	buf += sprintf(buf, "nTnodes............ %d\n", dev->nTnodes);
+	buf += sprintf(buf, "nObjects........... %d\n", dev->nObjects);
+	buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
+	buf += sprintf(buf, "\n");
+	buf += sprintf(buf, "nPageWrites........ %u\n", dev->nPageWrites);
+	buf += sprintf(buf, "nPageReads......... %u\n", dev->nPageReads);
+	buf += sprintf(buf, "nBlockErasures..... %u\n", dev->nBlockErasures);
+	buf += sprintf(buf, "nGCCopies.......... %u\n", dev->nGCCopies);
+	buf += sprintf(buf, "allGCs............. %u\n", dev->allGCs);
+	buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGCs);
+	buf += sprintf(buf, "oldestDirtyGCs..... %u\n", dev->oldestDirtyGCs);
+	buf += sprintf(buf, "nGCBlocks.......... %u\n", dev->nGCBlocks);
+	buf += sprintf(buf, "backgroundGCs...... %u\n", dev->backgroundGCs);
+	buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
+	buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
+	buf += sprintf(buf, "eccFixed........... %u\n", dev->eccFixed);
+	buf += sprintf(buf, "eccUnfixed......... %u\n", dev->eccUnfixed);
+	buf += sprintf(buf, "tagsEccFixed....... %u\n", dev->tagsEccFixed);
+	buf += sprintf(buf, "tagsEccUnfixed..... %u\n", dev->tagsEccUnfixed);
+	buf += sprintf(buf, "cacheHits.......... %u\n", dev->cacheHits);
+	buf += sprintf(buf, "nDeletedFiles...... %u\n", dev->nDeletedFiles);
+	buf += sprintf(buf, "nUnlinkedFiles..... %u\n", dev->nUnlinkedFiles);
+	buf += sprintf(buf, "refreshCount....... %u\n", dev->refreshCount);
+	buf +=
+	    sprintf(buf, "nBackgroudDeletions %u\n", dev->nBackgroundDeletions);
+
+	return buf;
+}
+
+static int yaffs_proc_read(char *page,
+			   char **start,
+			   off_t offset, int count, int *eof, void *data)
+{
+	struct ylist_head *item;
+	char *buf = page;
+	int step = offset;
+	int n = 0;
+
+	/* Get proc_file_read() to step 'offset' by one on each sucessive call.
+	 * We use 'offset' (*ppos) to indicate where we are in devList.
+	 * This also assumes the user has posted a read buffer large
+	 * enough to hold the complete output; but that's life in /proc.
+	 */
+
+	*(int *)start = 1;
+
+	/* Print header first */
+	if (step == 0)
+		buf += sprintf(buf, "Multi-version YAFFS built:" __DATE__ " " __TIME__"\n");
+	else if (step == 1)
+		buf += sprintf(buf,"\n");
+	else {
+		step-=2;
+		
+		down(&yaffs_context_lock);
+
+		/* Locate and print the Nth entry.  Order N-squared but N is small. */
+		ylist_for_each(item, &yaffs_context_list) {
+			struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
+			yaffs_Device *dev = dc->dev;
+
+			if (n < (step & ~1)) {
+				n+=2;
+				continue;
+			}
+			if((step & 1)==0){
+				buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->param.name);
+				buf = yaffs_dump_dev_part0(buf, dev);
+			} else
+				buf = yaffs_dump_dev_part1(buf, dev);
+			
+			break;
+		}
+		up(&yaffs_context_lock);
+	}
+
+	return buf - page < count ? buf - page : count;
+}
+
+static int yaffs_stats_proc_read(char *page,
+				char **start,
+				off_t offset, int count, int *eof, void *data)
+{
+	struct ylist_head *item;
+	char *buf = page;
+	int n = 0;
+
+	down(&yaffs_context_lock);
+
+	/* Locate and print the Nth entry.  Order N-squared but N is small. */
+	ylist_for_each(item, &yaffs_context_list) {
+		struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
+		yaffs_Device *dev = dc->dev;
+
+		int erasedChunks;
+
+		erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
+		
+		buf += sprintf(buf,"%d, %d, %d, %u, %u, %u, %u\n",
+				n, dev->nFreeChunks, erasedChunks,
+				dev->backgroundGCs, dev->oldestDirtyGCs,
+				dev->nObjects, dev->nTnodes);
+	}
+	up(&yaffs_context_lock);
+
+
+	return buf - page < count ? buf - page : count;
+}
+
+/**
+ * Set the verbosity of the warnings and error messages.
+ *
+ * Note that the names can only be a..z or _ with the current code.
+ */
+
+static struct {
+	char *mask_name;
+	unsigned mask_bitfield;
+} mask_flags[] = {
+	{"allocate", YAFFS_TRACE_ALLOCATE},
+	{"always", YAFFS_TRACE_ALWAYS},
+	{"background", YAFFS_TRACE_BACKGROUND},
+	{"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
+	{"buffers", YAFFS_TRACE_BUFFERS},
+	{"bug", YAFFS_TRACE_BUG},
+	{"checkpt", YAFFS_TRACE_CHECKPOINT},
+	{"deletion", YAFFS_TRACE_DELETION},
+	{"erase", YAFFS_TRACE_ERASE},
+	{"error", YAFFS_TRACE_ERROR},
+	{"gc_detail", YAFFS_TRACE_GC_DETAIL},
+	{"gc", YAFFS_TRACE_GC},
+	{"lock", YAFFS_TRACE_LOCK},
+	{"mtd", YAFFS_TRACE_MTD},
+	{"nandaccess", YAFFS_TRACE_NANDACCESS},
+	{"os", YAFFS_TRACE_OS},
+	{"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
+	{"scan", YAFFS_TRACE_SCAN},
+	{"tracing", YAFFS_TRACE_TRACING},
+	{"sync", YAFFS_TRACE_SYNC},
+	{"write", YAFFS_TRACE_WRITE},
+
+	{"verify", YAFFS_TRACE_VERIFY},
+	{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
+	{"verify_full", YAFFS_TRACE_VERIFY_FULL},
+	{"verify_all", YAFFS_TRACE_VERIFY_ALL},
+
+	{"all", 0xffffffff},
+	{"none", 0},
+	{NULL, 0},
+};
+
+#define MAX_MASK_NAME_LENGTH 40
+static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
+					 unsigned long count, void *data)
+{
+	unsigned rg = 0, mask_bitfield;
+	char *end;
+	char *mask_name;
+	const char *x;
+	char substring[MAX_MASK_NAME_LENGTH + 1];
+	int i;
+	int done = 0;
+	int add, len = 0;
+	int pos = 0;
+
+	rg = yaffs_traceMask;
+
+	while (!done && (pos < count)) {
+		done = 1;
+		while ((pos < count) && isspace(buf[pos]))
+			pos++;
+
+		switch (buf[pos]) {
+		case '+':
+		case '-':
+		case '=':
+			add = buf[pos];
+			pos++;
+			break;
+
+		default:
+			add = ' ';
+			break;
+		}
+		mask_name = NULL;
+
+		mask_bitfield = simple_strtoul(buf + pos, &end, 0);
+
+		if (end > buf + pos) {
+			mask_name = "numeral";
+			len = end - (buf + pos);
+			pos += len;
+			done = 0;
+		} else {
+			for (x = buf + pos, i = 0;
+			    (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
+			    i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
+				substring[i] = *x;
+			substring[i] = '\0';
+
+			for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+				if (strcmp(substring, mask_flags[i].mask_name) == 0) {
+					mask_name = mask_flags[i].mask_name;
+					mask_bitfield = mask_flags[i].mask_bitfield;
+					done = 0;
+					break;
+				}
+			}
+		}
+
+		if (mask_name != NULL) {
+			done = 0;
+			switch (add) {
+			case '-':
+				rg &= ~mask_bitfield;
+				break;
+			case '+':
+				rg |= mask_bitfield;
+				break;
+			case '=':
+				rg = mask_bitfield;
+				break;
+			default:
+				rg |= mask_bitfield;
+				break;
+			}
+		}
+	}
+
+	yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
+
+	printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
+
+	if (rg & YAFFS_TRACE_ALWAYS) {
+		for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+			char flag;
+			flag = ((rg & mask_flags[i].mask_bitfield) ==
+				mask_flags[i].mask_bitfield) ? '+' : '-';
+			printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
+		}
+	}
+
+	return count;
+}
+
+
+static int yaffs_proc_write(struct file *file, const char *buf,
+					 unsigned long count, void *data)
+{
+        return yaffs_proc_write_trace_options(file, buf, count, data);
+}
+
+/* Stuff to handle installation of file systems */
+struct file_system_to_install {
+	struct file_system_type *fst;
+	int installed;
+};
+
+static struct file_system_to_install fs_to_install[] = {
+	{&yaffs_fs_type, 0},
+	{&yaffs2_fs_type, 0},
+	{NULL, 0}
+};
+
+static int __init init_yaffs_fs(void)
+{
+	int error = 0;
+	struct file_system_to_install *fsinst;
+
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR(" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
+#endif
+
+
+
+
+	init_MUTEX(&yaffs_context_lock);
+
+	/* Install the proc_fs entries */
+	my_proc_entry = create_proc_entry("yaffs",
+					       S_IRUGO | S_IFREG,
+					       YPROC_ROOT);
+
+	if (my_proc_entry) {
+		my_proc_entry->write_proc = yaffs_proc_write;
+		my_proc_entry->read_proc = yaffs_proc_read;
+		my_proc_entry->data = NULL;
+	} else
+		return -ENOMEM;
+
+	debug_proc_entry = create_proc_entry("yaffs_stats",
+					       S_IRUGO | S_IFREG,
+					       YPROC_ROOT);
+
+	if (debug_proc_entry) {
+		debug_proc_entry->write_proc = NULL;
+		debug_proc_entry->read_proc = yaffs_stats_proc_read;
+		debug_proc_entry->data = NULL;
+	} else
+		return -ENOMEM;
+
+	/* Now add the file system entries */
+
+	fsinst = fs_to_install;
+
+	while (fsinst->fst && !error) {
+		error = register_filesystem(fsinst->fst);
+		if (!error)
+			fsinst->installed = 1;
+		fsinst++;
+	}
+
+	/* Any errors? uninstall  */
+	if (error) {
+		fsinst = fs_to_install;
+
+		while (fsinst->fst) {
+			if (fsinst->installed) {
+				unregister_filesystem(fsinst->fst);
+				fsinst->installed = 0;
+			}
+			fsinst++;
+		}
+	}
+
+	return error;
+}
+
+static void __exit exit_yaffs_fs(void)
+{
+
+	struct file_system_to_install *fsinst;
+
+	T(YAFFS_TRACE_ALWAYS,
+		(TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
+
+	remove_proc_entry("yaffs", YPROC_ROOT);
+	remove_proc_entry("yaffs_stats", YPROC_ROOT);
+
+	fsinst = fs_to_install;
+
+	while (fsinst->fst) {
+		if (fsinst->installed) {
+			unregister_filesystem(fsinst->fst);
+			fsinst->installed = 0;
+		}
+		fsinst++;
+	}
+}
+
+module_init(init_yaffs_fs)
+module_exit(exit_yaffs_fs)
+
+MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
+MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.c
@@ -0,0 +1,465 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+
+int yaffs1_Scan(yaffs_Device *dev)
+{
+	yaffs_ExtendedTags tags;
+	int blk;
+	int blockIterator;
+	int startIterator;
+	int endIterator;
+	int result;
+
+	int chunk;
+	int c;
+	int deleted;
+	yaffs_BlockState state;
+	yaffs_Object *hardList = NULL;
+	yaffs_BlockInfo *bi;
+	__u32 sequenceNumber;
+	yaffs_ObjectHeader *oh;
+	yaffs_Object *in;
+	yaffs_Object *parent;
+
+	int alloc_failed = 0;
+
+	struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
+
+
+	__u8 *chunkData;
+
+
+
+	T(YAFFS_TRACE_SCAN,
+	  (TSTR("yaffs1_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
+	   dev->internalStartBlock, dev->internalEndBlock));
+
+	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->blockInfo;
+	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+		yaffs_ClearChunkBits(dev, blk);
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+
+		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+		bi->blockState = state;
+		bi->sequenceNumber = sequenceNumber;
+
+		if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+
+		T(YAFFS_TRACE_SCAN_DEBUG,
+		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+		   state, sequenceNumber));
+
+		if (state == YAFFS_BLOCK_STATE_DEAD) {
+			T(YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("block %d is bad" TENDSTR), blk));
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			T(YAFFS_TRACE_SCAN_DEBUG,
+			  (TSTR("Block empty " TENDSTR)));
+			dev->nErasedBlocks++;
+			dev->nFreeChunks += dev->param.nChunksPerBlock;
+		}
+		bi++;
+	}
+
+	startIterator = dev->internalStartBlock;
+	endIterator = dev->internalEndBlock;
+
+	/* For each block.... */
+	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
+	     blockIterator++) {
+
+		YYIELD();
+
+		YYIELD();
+
+		blk = blockIterator;
+
+		bi = yaffs_GetBlockInfo(dev, blk);
+		state = bi->blockState;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning....*/
+		for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
+		     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+			/* Read the tags and decide what to do */
+			chunk = blk * dev->param.nChunksPerBlock + c;
+
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+							&tags);
+
+			/* Let's have a good look at this chunk... */
+
+			if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
+				/* YAFFS1 only...
+				 * A deleted chunk
+				 */
+				deleted++;
+				dev->nFreeChunks++;
+				/*T((" %d %d deleted\n",blk,c)); */
+			} else if (!tags.chunkUsed) {
+				/* An unassigned chunk in the block
+				 * This means that either the block is empty or
+				 * this is the one being allocated from
+				 */
+
+				if (c == 0) {
+					/* We're looking at the first chunk in the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->nErasedBlocks++;
+				} else {
+					/* this is the block being allocated from */
+					T(YAFFS_TRACE_SCAN,
+					  (TSTR
+					   (" Allocating from %d %d" TENDSTR),
+					   blk, c));
+					state = YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->allocationBlock = blk;
+					dev->allocationPage = c;
+					dev->allocationBlockFinder = blk;
+					/* Set block finder here to encourage the allocator to go forth from here. */
+
+				}
+
+				dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
+			} else if (tags.chunkId > 0) {
+				/* chunkId > 0 so it is a data chunk... */
+				unsigned int endpos;
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      YAFFS_OBJECT_TYPE_FILE);
+				/* PutChunkIntoFile checks for a clash (two data chunks with
+				 * the same chunkId).
+				 */
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in) {
+					if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
+						alloc_failed = 1;
+				}
+
+				endpos =
+				    (tags.chunkId - 1) * dev->nDataBytesPerChunk +
+				    tags.byteCount;
+				if (in &&
+				    in->variantType == YAFFS_OBJECT_TYPE_FILE
+				    && in->variant.fileVariant.scannedFileSize <
+				    endpos) {
+					in->variant.fileVariant.
+					    scannedFileSize = endpos;
+					if (!dev->param.useHeaderFileSize) {
+						in->variant.fileVariant.
+						    fileSize =
+						    in->variant.fileVariant.
+						    scannedFileSize;
+					}
+
+				}
+				/* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
+			} else {
+				/* chunkId == 0, so it is an ObjectHeader.
+				 * Thus, we read in the object header and make the object
+				 */
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
+								chunkData,
+								NULL);
+
+				oh = (yaffs_ObjectHeader *) chunkData;
+
+				in = yaffs_FindObjectByNumber(dev,
+							      tags.objectId);
+				if (in && in->variantType != oh->type) {
+					/* This should not happen, but somehow
+					 * Wev'e ended up with an objectId that has been reused but not yet
+					 * deleted, and worse still it has changed type. Delete the old object.
+					 */
+
+					yaffs_DeleteObject(in);
+
+					in = 0;
+				}
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      oh->type);
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in && oh->shadowsObject > 0) {
+
+					struct yaffs_ShadowFixerStruct *fixer;
+					fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
+					if (fixer) {
+						fixer->next = shadowFixerList;
+						shadowFixerList = fixer;
+						fixer->objectId = tags.objectId;
+						fixer->shadowedId = oh->shadowsObject;
+						T(YAFFS_TRACE_SCAN,
+						  (TSTR
+						   (" Shadow fixer: %d shadows %d" TENDSTR),
+						   fixer->objectId, fixer->shadowedId));
+
+					}
+
+				}
+
+				if (in && in->valid) {
+					/* We have already filled this one. We have a duplicate and need to resolve it. */
+
+					unsigned existingSerial = in->serial;
+					unsigned newSerial = tags.serialNumber;
+
+					if (((existingSerial + 1) & 3) == newSerial) {
+						/* Use new one - destroy the exisiting one */
+						yaffs_DeleteChunk(dev,
+								  in->hdrChunk,
+								  1, __LINE__);
+						in->valid = 0;
+					} else {
+						/* Use existing - destroy this one. */
+						yaffs_DeleteChunk(dev, chunk, 1,
+								  __LINE__);
+					}
+				}
+
+				if (in && !in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle with directory structure */
+					in->valid = 1;
+					in->variantType = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+					in->win_atime[0] = oh->win_atime[0];
+					in->win_ctime[0] = oh->win_ctime[0];
+					in->win_mtime[0] = oh->win_mtime[0];
+					in->win_atime[1] = oh->win_atime[1];
+					in->win_ctime[1] = oh->win_ctime[1];
+					in->win_mtime[1] = oh->win_mtime[1];
+#else
+					in->yst_uid = oh->yst_uid;
+					in->yst_gid = oh->yst_gid;
+					in->yst_atime = oh->yst_atime;
+					in->yst_mtime = oh->yst_mtime;
+					in->yst_ctime = oh->yst_ctime;
+					in->yst_rdev = oh->yst_rdev;
+#endif
+					in->hdrChunk = chunk;
+					in->serial = tags.serialNumber;
+
+				} else if (in && !in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->variantType = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+					in->win_atime[0] = oh->win_atime[0];
+					in->win_ctime[0] = oh->win_ctime[0];
+					in->win_mtime[0] = oh->win_mtime[0];
+					in->win_atime[1] = oh->win_atime[1];
+					in->win_ctime[1] = oh->win_ctime[1];
+					in->win_mtime[1] = oh->win_mtime[1];
+#else
+					in->yst_uid = oh->yst_uid;
+					in->yst_gid = oh->yst_gid;
+					in->yst_atime = oh->yst_atime;
+					in->yst_mtime = oh->yst_mtime;
+					in->yst_ctime = oh->yst_ctime;
+					in->yst_rdev = oh->yst_rdev;
+#endif
+					in->hdrChunk = chunk;
+					in->serial = tags.serialNumber;
+
+					yaffs_SetObjectNameFromOH(in, oh);
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					parent =
+					    yaffs_FindOrCreateObjectByNumber
+					    (dev, oh->parentObjectId,
+					     YAFFS_OBJECT_TYPE_DIRECTORY);
+					if (!parent)
+						alloc_failed = 1;
+					if (parent && parent->variantType ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variantType =
+							YAFFS_OBJECT_TYPE_DIRECTORY;
+						YINIT_LIST_HEAD(&parent->variant.
+								directoryVariant.
+								children);
+					} else if (!parent || parent->variantType !=
+						   YAFFS_OBJECT_TYPE_DIRECTORY) {
+						/* Hoosterman, another problem....
+						 * We're trying to use a non-directory as a directory
+						 */
+
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR
+						   ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+						    TENDSTR)));
+						parent = dev->lostNFoundDir;
+					}
+
+					yaffs_AddObjectToDirectory(parent, in);
+
+					if (0 && (parent == dev->deletedDir ||
+						  parent == dev->unlinkedDir)) {
+						in->deleted = 1;	/* If it is unlinked at start up then it wants deleting */
+						dev->nDeletedFiles++;
+					}
+					/* Note re hardlinks.
+					 * Since we might scan a hardlink before its equivalent object is scanned
+					 * we put them all in a list.
+					 * After scanning is complete, we should have all the objects, so we run through this
+					 * list and fix up all the chains.
+					 */
+
+					switch (in->variantType) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+						if (dev->param.useHeaderFileSize)
+
+							in->variant.fileVariant.
+							    fileSize =
+							    oh->fileSize;
+
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						in->variant.hardLinkVariant.
+							equivalentObjectId =
+							oh->equivalentObjectId;
+						in->hardLinks.next =
+							(struct ylist_head *)
+							hardList;
+						hardList = in;
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:
+						in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->alias);
+						if (!in->variant.symLinkVariant.alias)
+							alloc_failed = 1;
+						break;
+					}
+
+				}
+			}
+		}
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			/* If we got this far while scanning, then the block is fully allocated.*/
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+			/* If the block was partially allocated then treat it as fully allocated.*/
+			state = YAFFS_BLOCK_STATE_FULL;
+			dev->allocationBlock = -1;
+		}
+
+		bi->blockState = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_BlockBecameDirty(dev, blk);
+		}
+
+	}
+
+
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add these
+	 * hardlinks.
+	 */
+
+	yaffs_HardlinkFixup(dev, hardList);
+
+	/* Fix up any shadowed objects */
+	{
+		struct yaffs_ShadowFixerStruct *fixer;
+		yaffs_Object *obj;
+
+		while (shadowFixerList) {
+			fixer = shadowFixerList;
+			shadowFixerList = fixer->next;
+			/* Complete the rename transaction by deleting the shadowed object
+			 * then setting the object header to unshadowed.
+			 */
+			obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
+			if (obj)
+				yaffs_DeleteObject(obj);
+
+			obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
+
+			if (obj)
+				yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0, NULL);
+
+			YFREE(fixer);
+		}
+	}
+
+	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	T(YAFFS_TRACE_SCAN, (TSTR("yaffs1_Scan ends" TENDSTR)));
+
+
+	return YAFFS_OK;
+}
+
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.h
@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS1_H__
+#define __YAFFS_YAFFS1_H__
+
+#include "yaffs_guts.h"
+int yaffs1_Scan(yaffs_Device *dev);
+
+#endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.c
@@ -0,0 +1,1540 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_checkptrw.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_qsort.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_verify.h"
+
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+
+#define YAFFS_SMALL_HOLE_THRESHOLD 4
+
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+ 
+/* yaffs2_CalcOldestDirtySequence()
+ * yaffs2_FindOldestDirtySequence()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+void yaffs2_CalcOldestDirtySequence(yaffs_Device *dev)
+{
+	int i;
+	unsigned seq;
+	unsigned blockNo = 0;
+	yaffs_BlockInfo *b;
+
+	if(!dev->param.isYaffs2)
+		return;
+
+	/* Find the oldest dirty sequence number. */
+	seq = dev->sequenceNumber + 1;
+	b = dev->blockInfo;
+	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+		if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
+			(b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
+			b->sequenceNumber < seq) {
+			seq = b->sequenceNumber;
+			blockNo = i;
+		}
+		b++;
+	}
+
+	if(blockNo){
+		dev->oldestDirtySequence = seq;
+		dev->oldestDirtyBlock = blockNo;
+	}
+
+}
+
+
+void yaffs2_FindOldestDirtySequence(yaffs_Device *dev)
+{
+	if(!dev->param.isYaffs2)
+		return;
+
+	if(!dev->oldestDirtySequence)
+		yaffs2_CalcOldestDirtySequence(dev);
+}
+
+/*
+ * yaffs_ClearOldestDirtySequence()
+ * Called when a block is erased or marked bad. (ie. when its sequenceNumber
+ * becomes invalid). If the value matches the oldest then we clear 
+ * dev->oldestDirtySequence to force its recomputation.
+ */
+void yaffs2_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+
+	if(!dev->param.isYaffs2)
+		return;
+
+	if(!bi || bi->sequenceNumber == dev->oldestDirtySequence){
+		dev->oldestDirtySequence = 0;
+		dev->oldestDirtyBlock = 0;
+	}
+}
+
+/*
+ * yaffs2_UpdateOldestDirtySequence()
+ * Update the oldest dirty sequence number whenever we dirty a block.
+ * Only do this if the oldestDirtySequence is actually being tracked.
+ */
+void yaffs2_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi)
+{
+	if(!dev->param.isYaffs2)
+		return;
+
+	if(dev->oldestDirtySequence){
+		if(dev->oldestDirtySequence > bi->sequenceNumber){
+			dev->oldestDirtySequence = bi->sequenceNumber;
+			dev->oldestDirtyBlock = blockNo;
+		}
+	}
+}
+
+int yaffs2_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
+					yaffs_BlockInfo *bi)
+{
+
+	if (!dev->param.isYaffs2)
+		return 1;	/* disqualification only applies to yaffs2. */
+
+	if (!bi->hasShrinkHeader)
+		return 1;	/* can gc */
+
+	yaffs2_FindOldestDirtySequence(dev);
+
+	/* Can't do gc of this block if there are any blocks older than this one that have
+	 * discarded pages.
+	 */
+	return (bi->sequenceNumber <= dev->oldestDirtySequence);
+}
+
+/*
+ * yaffs2_FindRefreshBlock()
+ * periodically finds the oldest full block by sequence number for refreshing.
+ * Only for yaffs2.
+ */
+__u32 yaffs2_FindRefreshBlock(yaffs_Device *dev)
+{
+	__u32 b ;
+
+	__u32 oldest = 0;
+	__u32 oldestSequence = 0;
+
+	yaffs_BlockInfo *bi;
+
+	if(!dev->param.isYaffs2)
+		return oldest;
+
+	/*
+	 * If refresh period < 10 then refreshing is disabled.
+	 */
+	if(dev->param.refreshPeriod < 10)
+	        return oldest;
+
+        /*
+         * Fix broken values.
+         */
+        if(dev->refreshSkip > dev->param.refreshPeriod)
+                dev->refreshSkip = dev->param.refreshPeriod;
+
+	if(dev->refreshSkip > 0)
+	        return oldest;
+
+	/*
+	 * Refresh skip is now zero.
+	 * We'll do a refresh this time around....
+	 * Update the refresh skip and find the oldest block.
+	 */
+	dev->refreshSkip = dev->param.refreshPeriod;
+	dev->refreshCount++;
+	bi = dev->blockInfo;
+	for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
+
+		if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
+
+			if(oldest < 1 ||
+                                bi->sequenceNumber < oldestSequence){
+                                oldest = b;
+                                oldestSequence = bi->sequenceNumber;
+                        }
+		}
+		bi++;
+	}
+
+	if (oldest > 0) {
+		T(YAFFS_TRACE_GC,
+		  (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
+		   dev->refreshCount, oldest, oldestSequence));
+	}
+
+	return oldest;
+}
+
+int yaffs2_CheckpointRequired(yaffs_Device *dev)
+{
+	int nblocks;
+	
+	if(!dev->param.isYaffs2)
+		return 0;
+	
+	nblocks = dev->internalEndBlock - dev->internalStartBlock + 1 ;
+
+	return 	!dev->param.skipCheckpointWrite &&
+		!dev->readOnly &&
+		(nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
+
+int yaffs2_CalcCheckpointBlocksRequired(yaffs_Device *dev)
+{
+	int retval;
+
+	if(!dev->param.isYaffs2)
+		return 0;
+
+	if (!dev->nCheckpointBlocksRequired &&
+		yaffs2_CheckpointRequired(dev)){
+		/* Not a valid value so recalculate */
+		int nBytes = 0;
+		int nBlocks;
+		int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
+
+		nBytes += sizeof(yaffs_CheckpointValidity);
+		nBytes += sizeof(yaffs_CheckpointDevice);
+		nBytes += devBlocks * sizeof(yaffs_BlockInfo);
+		nBytes += devBlocks * dev->chunkBitmapStride;
+		nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjects);
+		nBytes += (dev->tnodeSize + sizeof(__u32)) * (dev->nTnodes);
+		nBytes += sizeof(yaffs_CheckpointValidity);
+		nBytes += sizeof(__u32); /* checksum*/
+
+		/* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
+
+		nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
+
+		dev->nCheckpointBlocksRequired = nBlocks;
+	}
+
+	retval = dev->nCheckpointBlocksRequired - dev->blocksInCheckpoint;
+	if(retval < 0)
+		retval = 0;
+	return retval;
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+
+static int yaffs2_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+	yaffs_CheckpointValidity cp;
+
+	memset(&cp, 0, sizeof(cp));
+
+	cp.structType = sizeof(cp);
+	cp.magic = YAFFS_MAGIC;
+	cp.version = YAFFS_CHECKPOINT_VERSION;
+	cp.head = (head) ? 1 : 0;
+
+	return (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
+		1 : 0;
+}
+
+static int yaffs2_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+	yaffs_CheckpointValidity cp;
+	int ok;
+
+	ok = (yaffs2_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	if (ok)
+		ok = (cp.structType == sizeof(cp)) &&
+		     (cp.magic == YAFFS_MAGIC) &&
+		     (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+		     (cp.head == ((head) ? 1 : 0));
+	return ok ? 1 : 0;
+}
+
+static void yaffs2_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
+					   yaffs_Device *dev)
+{
+	cp->nErasedBlocks = dev->nErasedBlocks;
+	cp->allocationBlock = dev->allocationBlock;
+	cp->allocationPage = dev->allocationPage;
+	cp->nFreeChunks = dev->nFreeChunks;
+
+	cp->nDeletedFiles = dev->nDeletedFiles;
+	cp->nUnlinkedFiles = dev->nUnlinkedFiles;
+	cp->nBackgroundDeletions = dev->nBackgroundDeletions;
+	cp->sequenceNumber = dev->sequenceNumber;
+
+}
+
+static void yaffs2_CheckpointDeviceToDevice(yaffs_Device *dev,
+					   yaffs_CheckpointDevice *cp)
+{
+	dev->nErasedBlocks = cp->nErasedBlocks;
+	dev->allocationBlock = cp->allocationBlock;
+	dev->allocationPage = cp->allocationPage;
+	dev->nFreeChunks = cp->nFreeChunks;
+
+	dev->nDeletedFiles = cp->nDeletedFiles;
+	dev->nUnlinkedFiles = cp->nUnlinkedFiles;
+	dev->nBackgroundDeletions = cp->nBackgroundDeletions;
+	dev->sequenceNumber = cp->sequenceNumber;
+}
+
+
+static int yaffs2_WriteCheckpointDevice(yaffs_Device *dev)
+{
+	yaffs_CheckpointDevice cp;
+	__u32 nBytes;
+	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+	int ok;
+
+	/* Write device runtime values*/
+	yaffs2_DeviceToCheckpointDevice(&cp, dev);
+	cp.structType = sizeof(cp);
+
+	ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	/* Write block info */
+	if (ok) {
+		nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+		ok = (yaffs2_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
+	}
+
+	/* Write chunk bits */
+	if (ok) {
+		nBytes = nBlocks * dev->chunkBitmapStride;
+		ok = (yaffs2_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
+	}
+	return	 ok ? 1 : 0;
+
+}
+
+static int yaffs2_ReadCheckpointDevice(yaffs_Device *dev)
+{
+	yaffs_CheckpointDevice cp;
+	__u32 nBytes;
+	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+	int ok;
+
+	ok = (yaffs2_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+	if (!ok)
+		return 0;
+
+	if (cp.structType != sizeof(cp))
+		return 0;
+
+
+	yaffs2_CheckpointDeviceToDevice(dev, &cp);
+
+	nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+
+	ok = (yaffs2_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
+
+	if (!ok)
+		return 0;
+	nBytes = nBlocks * dev->chunkBitmapStride;
+
+	ok = (yaffs2_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
+
+	return ok ? 1 : 0;
+}
+
+static void yaffs2_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
+					   yaffs_Object *obj)
+{
+
+	cp->objectId = obj->objectId;
+	cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
+	cp->hdrChunk = obj->hdrChunk;
+	cp->variantType = obj->variantType;
+	cp->deleted = obj->deleted;
+	cp->softDeleted = obj->softDeleted;
+	cp->unlinked = obj->unlinked;
+	cp->fake = obj->fake;
+	cp->renameAllowed = obj->renameAllowed;
+	cp->unlinkAllowed = obj->unlinkAllowed;
+	cp->serial = obj->serial;
+	cp->nDataChunks = obj->nDataChunks;
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+		cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
+	else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+		cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
+}
+
+static int yaffs2_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
+{
+
+	yaffs_Object *parent;
+
+	if (obj->variantType != cp->variantType) {
+		T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
+			TCONT("chunk %d does not match existing object type %d")
+			TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
+			obj->variantType));
+		return 0;
+	}
+
+	obj->objectId = cp->objectId;
+
+	if (cp->parentId)
+		parent = yaffs_FindOrCreateObjectByNumber(
+					obj->myDev,
+					cp->parentId,
+					YAFFS_OBJECT_TYPE_DIRECTORY);
+	else
+		parent = NULL;
+
+	if (parent) {
+		if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+			T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
+				TCONT(" chunk %d Parent type, %d, not directory")
+				TENDSTR),
+				cp->objectId, cp->parentId, cp->variantType,
+				cp->hdrChunk, parent->variantType));
+			return 0;
+		}
+		yaffs_AddObjectToDirectory(parent, obj);
+	}
+
+	obj->hdrChunk = cp->hdrChunk;
+	obj->variantType = cp->variantType;
+	obj->deleted = cp->deleted;
+	obj->softDeleted = cp->softDeleted;
+	obj->unlinked = cp->unlinked;
+	obj->fake = cp->fake;
+	obj->renameAllowed = cp->renameAllowed;
+	obj->unlinkAllowed = cp->unlinkAllowed;
+	obj->serial = cp->serial;
+	obj->nDataChunks = cp->nDataChunks;
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+		obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
+	else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+		obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
+
+	if (obj->hdrChunk > 0)
+		obj->lazyLoaded = 1;
+	return 1;
+}
+
+
+
+static int yaffs2_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
+					__u32 level, int chunkOffset)
+{
+	int i;
+	yaffs_Device *dev = in->myDev;
+	int ok = 1;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+				if (tn->internal[i]) {
+					ok = yaffs2_CheckpointTnodeWorker(in,
+							tn->internal[i],
+							level - 1,
+							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+				}
+			}
+		} else if (level == 0) {
+			__u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
+			ok = (yaffs2_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
+			if (ok)
+				ok = (yaffs2_CheckpointWrite(dev, tn, dev->tnodeSize) == dev->tnodeSize);
+		}
+	}
+
+	return ok;
+
+}
+
+static int yaffs2_WriteCheckpointTnodes(yaffs_Object *obj)
+{
+	__u32 endMarker = ~0;
+	int ok = 1;
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+		ok = yaffs2_CheckpointTnodeWorker(obj,
+					    obj->variant.fileVariant.top,
+					    obj->variant.fileVariant.topLevel,
+					    0);
+		if (ok)
+			ok = (yaffs2_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
+				sizeof(endMarker));
+	}
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_ReadCheckpointTnodes(yaffs_Object *obj)
+{
+	__u32 baseChunk;
+	int ok = 1;
+	yaffs_Device *dev = obj->myDev;
+	yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
+	yaffs_Tnode *tn;
+	int nread = 0;
+
+	ok = (yaffs2_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
+
+	while (ok && (~baseChunk)) {
+		nread++;
+		/* Read level 0 tnode */
+
+
+		tn = yaffs_GetTnode(dev);
+		if (tn){
+			ok = (yaffs2_CheckpointRead(dev, tn, dev->tnodeSize) == dev->tnodeSize);
+		} else
+			ok = 0;
+
+		if (tn && ok)
+			ok = yaffs_AddOrFindLevel0Tnode(dev,
+							fileStructPtr,
+							baseChunk,
+							tn) ? 1 : 0;
+
+		if (ok)
+			ok = (yaffs2_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
+
+	}
+
+	T(YAFFS_TRACE_CHECKPOINT, (
+		TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
+		nread, baseChunk, ok));
+
+	return ok ? 1 : 0;
+}
+
+
+static int yaffs2_WriteCheckpointObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_CheckpointObject cp;
+	int i;
+	int ok = 1;
+	struct ylist_head *lh;
+
+
+	/* Iterate through the objects in each hash entry,
+	 * dumping them to the checkpointing stream.
+	 */
+
+	for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
+		ylist_for_each(lh, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = ylist_entry(lh, yaffs_Object, hashLink);
+				if (!obj->deferedFree) {
+					yaffs2_ObjectToCheckpointObject(&cp, obj);
+					cp.structType = sizeof(cp);
+
+					T(YAFFS_TRACE_CHECKPOINT, (
+						TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
+						cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
+
+					ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+					if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+						ok = yaffs2_WriteCheckpointTnodes(obj);
+				}
+			}
+		}
+	}
+
+	/* Dump end of list */
+	memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
+	cp.structType = sizeof(cp);
+
+	if (ok)
+		ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_ReadCheckpointObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_CheckpointObject cp;
+	int ok = 1;
+	int done = 0;
+	yaffs_Object *hardList = NULL;
+
+	while (ok && !done) {
+		ok = (yaffs2_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+		if (cp.structType != sizeof(cp)) {
+			T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
+				cp.structType, (int)sizeof(cp), ok));
+			ok = 0;
+		}
+
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
+			cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
+
+		if (ok && cp.objectId == ~0)
+			done = 1;
+		else if (ok) {
+			obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
+			if (obj) {
+				ok = yaffs2_CheckpointObjectToObject(obj, &cp);
+				if (!ok)
+					break;
+				if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+					ok = yaffs2_ReadCheckpointTnodes(obj);
+				} else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+					obj->hardLinks.next =
+						(struct ylist_head *) hardList;
+					hardList = obj;
+				}
+			} else
+				ok = 0;
+		}
+	}
+
+	if (ok)
+		yaffs_HardlinkFixup(dev, hardList);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_WriteCheckpointSum(yaffs_Device *dev)
+{
+	__u32 checkpointSum;
+	int ok;
+
+	yaffs2_GetCheckpointSum(dev, &checkpointSum);
+
+	ok = (yaffs2_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
+
+	if (!ok)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs2_ReadCheckpointSum(yaffs_Device *dev)
+{
+	__u32 checkpointSum0;
+	__u32 checkpointSum1;
+	int ok;
+
+	yaffs2_GetCheckpointSum(dev, &checkpointSum0);
+
+	ok = (yaffs2_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
+
+	if (!ok)
+		return 0;
+
+	if (checkpointSum0 != checkpointSum1)
+		return 0;
+
+	return 1;
+}
+
+
+static int yaffs2_WriteCheckpointData(yaffs_Device *dev)
+{
+	int ok = 1;
+
+	if (!yaffs2_CheckpointRequired(dev)) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_CheckpointOpen(dev, 1);
+
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs2_WriteCheckpointValidityMarker(dev, 1);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
+		ok = yaffs2_WriteCheckpointDevice(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
+		ok = yaffs2_WriteCheckpointObjects(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs2_WriteCheckpointValidityMarker(dev, 0);
+	}
+
+	if (ok)
+		ok = yaffs2_WriteCheckpointSum(dev);
+
+	if (!yaffs2_CheckpointClose(dev))
+		ok = 0;
+
+	if (ok)
+		dev->isCheckpointed = 1;
+	else
+		dev->isCheckpointed = 0;
+
+	return dev->isCheckpointed;
+}
+
+static int yaffs2_ReadCheckpointData(yaffs_Device *dev)
+{
+	int ok = 1;
+	
+	if(!dev->param.isYaffs2)
+		ok = 0;
+
+	if (ok && dev->param.skipCheckpointRead) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_CheckpointOpen(dev, 0); /* open for read */
+
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
+		ok = yaffs2_ReadCheckpointValidityMarker(dev, 1);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
+		ok = yaffs2_ReadCheckpointDevice(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
+		ok = yaffs2_ReadCheckpointObjects(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
+		ok = yaffs2_ReadCheckpointValidityMarker(dev, 0);
+	}
+
+	if (ok) {
+		ok = yaffs2_ReadCheckpointSum(dev);
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
+	}
+
+	if (!yaffs2_CheckpointClose(dev))
+		ok = 0;
+
+	if (ok)
+		dev->isCheckpointed = 1;
+	else
+		dev->isCheckpointed = 0;
+
+	return ok ? 1 : 0;
+
+}
+
+void yaffs2_InvalidateCheckpoint(yaffs_Device *dev)
+{
+	if (dev->isCheckpointed ||
+			dev->blocksInCheckpoint > 0) {
+		dev->isCheckpointed = 0;
+		yaffs2_CheckpointInvalidateStream(dev);
+	}
+	if (dev->param.markSuperBlockDirty)
+		dev->param.markSuperBlockDirty(dev);
+}
+
+
+int yaffs_CheckpointSave(yaffs_Device *dev)
+{
+
+	T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+	yaffs_VerifyObjects(dev);
+	yaffs_VerifyBlocks(dev);
+	yaffs_VerifyFreeChunks(dev);
+
+	if (!dev->isCheckpointed) {
+		yaffs2_InvalidateCheckpoint(dev);
+		yaffs2_WriteCheckpointData(dev);
+	}
+
+	T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+	return dev->isCheckpointed;
+}
+
+int yaffs2_CheckpointRestore(yaffs_Device *dev)
+{
+	int retval;
+	T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+	retval = yaffs2_ReadCheckpointData(dev);
+
+	if (dev->isCheckpointed) {
+		yaffs_VerifyObjects(dev);
+		yaffs_VerifyBlocks(dev);
+		yaffs_VerifyFreeChunks(dev);
+	}
+
+	T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+	return retval;
+}
+
+int yaffs2_HandleHole(yaffs_Object *obj, loff_t newSize)
+{
+	/* if newsSize > oldFileSize.
+	 * We're going to be writing a hole.
+	 * If the hole is small then write zeros otherwise write a start of hole marker.
+	 */
+		
+
+	loff_t oldFileSize;
+	int increase;
+	int smallHole   ;
+	int result = YAFFS_OK;
+	yaffs_Device *dev = NULL;
+
+	__u8 *localBuffer = NULL;
+	
+	int smallIncreaseOk = 0;
+	
+	if(!obj)
+		return YAFFS_FAIL;
+
+	if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+	
+	dev = obj->myDev;
+	
+	/* Bail out if not yaffs2 mode */
+	if(!dev->param.isYaffs2)
+		return YAFFS_OK;
+
+	oldFileSize = obj->variant.fileVariant.fileSize;
+
+	if (newSize <= oldFileSize)
+		return YAFFS_OK;
+
+	increase = newSize - oldFileSize;
+
+	if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
+		yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
+		smallHole = 1;
+	else
+		smallHole = 0;
+
+	if(smallHole)
+		localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
+	
+	if(localBuffer){
+		/* fill hole with zero bytes */
+		int pos = oldFileSize;
+		int thisWrite;
+		int written;
+		memset(localBuffer,0,dev->nDataBytesPerChunk);
+		smallIncreaseOk = 1;
+
+		while(increase > 0 && smallIncreaseOk){
+			thisWrite = increase;
+			if(thisWrite > dev->nDataBytesPerChunk)
+				thisWrite = dev->nDataBytesPerChunk;
+			written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
+			if(written == thisWrite){
+				pos += thisWrite;
+				increase -= thisWrite;
+			} else
+				smallIncreaseOk = 0;
+		}
+
+		yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+
+		/* If we were out of space then reverse any chunks we've added */		
+		if(!smallIncreaseOk)
+			yaffs_ResizeDown(obj, oldFileSize);
+	}
+	
+	if (!smallIncreaseOk &&
+		obj->parent &&
+		obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+		obj->parent->objectId != YAFFS_OBJECTID_DELETED){
+		/* Write a hole start header with the old file size */
+		yaffs_UpdateObjectHeader(obj, NULL, 0, 1, 0, NULL);
+	}
+
+	return result;
+
+}
+
+
+typedef struct {
+	int seq;
+	int block;
+} yaffs_BlockIndex;
+
+
+static int yaffs2_ybicmp(const void *a, const void *b)
+{
+	register int aseq = ((yaffs_BlockIndex *)a)->seq;
+	register int bseq = ((yaffs_BlockIndex *)b)->seq;
+	register int ablock = ((yaffs_BlockIndex *)a)->block;
+	register int bblock = ((yaffs_BlockIndex *)b)->block;
+	if (aseq == bseq)
+		return ablock - bblock;
+	else
+		return aseq - bseq;
+}
+
+int yaffs2_ScanBackwards(yaffs_Device *dev)
+{
+	yaffs_ExtendedTags tags;
+	int blk;
+	int blockIterator;
+	int startIterator;
+	int endIterator;
+	int nBlocksToScan = 0;
+
+	int chunk;
+	int result;
+	int c;
+	int deleted;
+	yaffs_BlockState state;
+	yaffs_Object *hardList = NULL;
+	yaffs_BlockInfo *bi;
+	__u32 sequenceNumber;
+	yaffs_ObjectHeader *oh;
+	yaffs_Object *in;
+	yaffs_Object *parent;
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+	int itsUnlinked;
+	__u8 *chunkData;
+
+	int fileSize;
+	int isShrink;
+	int foundChunksInBlock;
+	int equivalentObjectId;
+	int alloc_failed = 0;
+
+
+	yaffs_BlockIndex *blockIndex = NULL;
+	int altBlockIndex = 0;
+
+	T(YAFFS_TRACE_SCAN,
+	  (TSTR
+	   ("yaffs2_ScanBackwards starts  intstartblk %d intendblk %d..."
+	    TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
+
+
+	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+
+	if (!blockIndex) {
+		blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
+		altBlockIndex = 1;
+	}
+
+	if (!blockIndex) {
+		T(YAFFS_TRACE_SCAN,
+		  (TSTR("yaffs2_ScanBackwards() could not allocate block index!" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	dev->blocksInCheckpoint = 0;
+
+	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->blockInfo;
+	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+		yaffs_ClearChunkBits(dev, blk);
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+
+		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+		bi->blockState = state;
+		bi->sequenceNumber = sequenceNumber;
+
+		if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+			bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+
+		T(YAFFS_TRACE_SCAN_DEBUG,
+		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+		   state, sequenceNumber));
+
+
+		if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			dev->blocksInCheckpoint++;
+
+		} else if (state == YAFFS_BLOCK_STATE_DEAD) {
+			T(YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("block %d is bad" TENDSTR), blk));
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			T(YAFFS_TRACE_SCAN_DEBUG,
+			  (TSTR("Block empty " TENDSTR)));
+			dev->nErasedBlocks++;
+			dev->nFreeChunks += dev->param.nChunksPerBlock;
+		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+			/* Determine the highest sequence number */
+			if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+			    sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+				blockIndex[nBlocksToScan].seq = sequenceNumber;
+				blockIndex[nBlocksToScan].block = blk;
+
+				nBlocksToScan++;
+
+				if (sequenceNumber >= dev->sequenceNumber)
+					dev->sequenceNumber = sequenceNumber;
+			} else {
+				/* TODO: Nasty sequence number! */
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR
+				   ("Block scanning block %d has bad sequence number %d"
+				    TENDSTR), blk, sequenceNumber));
+
+			}
+		}
+		bi++;
+	}
+
+	T(YAFFS_TRACE_SCAN,
+	(TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
+
+
+
+	YYIELD();
+
+	/* Sort the blocks by sequence number*/
+	yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), yaffs2_ybicmp);
+
+	YYIELD();
+
+	T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
+
+	/* Now scan the blocks looking at the data. */
+	startIterator = 0;
+	endIterator = nBlocksToScan - 1;
+	T(YAFFS_TRACE_SCAN_DEBUG,
+	  (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
+
+	/* For each block.... backwards */
+	for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
+			blockIterator--) {
+		/* Cooperative multitasking! This loop can run for so
+		   long that watchdog timers expire. */
+		YYIELD();
+
+		/* get the block to scan in the correct order */
+		blk = blockIndex[blockIterator].block;
+
+		bi = yaffs_GetBlockInfo(dev, blk);
+
+
+		state = bi->blockState;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning.... */
+		foundChunksInBlock = 0;
+		for (c = dev->param.nChunksPerBlock - 1;
+		     !alloc_failed && c >= 0 &&
+		     (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+		      state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
+			/* Scan backwards...
+			 * Read the tags and decide what to do
+			 */
+
+			chunk = blk * dev->param.nChunksPerBlock + c;
+
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+							&tags);
+
+			/* Let's have a good look at this chunk... */
+
+			if (!tags.chunkUsed) {
+				/* An unassigned chunk in the block.
+				 * If there are used chunks after this one, then
+				 * it is a chunk that was skipped due to failing the erased
+				 * check. Just skip it so that it can be deleted.
+				 * But, more typically, We get here when this is an unallocated
+				 * chunk and his means that either the block is empty or
+				 * this is the one being allocated from
+				 */
+
+				if (foundChunksInBlock) {
+					/* This is a chunk that was skipped due to failing the erased check */
+				} else if (c == 0) {
+					/* We're looking at the first chunk in the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->nErasedBlocks++;
+				} else {
+					if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+					    state == YAFFS_BLOCK_STATE_ALLOCATING) {
+						if (dev->sequenceNumber == bi->sequenceNumber) {
+							/* this is the block being allocated from */
+
+							T(YAFFS_TRACE_SCAN,
+							  (TSTR
+							   (" Allocating from %d %d"
+							    TENDSTR), blk, c));
+
+							state = YAFFS_BLOCK_STATE_ALLOCATING;
+							dev->allocationBlock = blk;
+							dev->allocationPage = c;
+							dev->allocationBlockFinder = blk;
+						} else {
+							/* This is a partially written block that is not
+							 * the current allocation block.
+							 */
+
+							 T(YAFFS_TRACE_SCAN,
+							 (TSTR("Partially written block %d detected" TENDSTR),
+							 blk));
+						}
+					}
+				}
+
+				dev->nFreeChunks++;
+
+			} else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
+				  blk, c));
+
+				  dev->nFreeChunks++;
+
+			} else if (tags.objectId > YAFFS_MAX_OBJECT_ID ||
+				tags.chunkId > YAFFS_MAX_CHUNK_ID ||
+				(tags.chunkId > 0 && tags.byteCount > dev->nDataBytesPerChunk) ||
+				tags.sequenceNumber != bi->sequenceNumber ) {
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR("Chunk (%d:%d) with bad tags:obj = %d, chunkId = %d, byteCount = %d, ignored"TENDSTR),
+				  blk, c,tags.objectId, tags.chunkId, tags.byteCount));
+
+				  dev->nFreeChunks++;
+
+			} else if (tags.chunkId > 0) {
+				/* chunkId > 0 so it is a data chunk... */
+				unsigned int endpos;
+				__u32 chunkBase =
+				    (tags.chunkId - 1) * dev->nDataBytesPerChunk;
+
+				foundChunksInBlock = 1;
+
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      YAFFS_OBJECT_TYPE_FILE);
+				if (!in) {
+					/* Out of memory */
+					alloc_failed = 1;
+				}
+
+				if (in &&
+				    in->variantType == YAFFS_OBJECT_TYPE_FILE
+				    && chunkBase < in->variant.fileVariant.shrinkSize) {
+					/* This has not been invalidated by a resize */
+					if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
+						alloc_failed = 1;
+					}
+
+					/* File size is calculated by looking at the data chunks if we have not
+					 * seen an object header yet. Stop this practice once we find an object header.
+					 */
+					endpos = chunkBase + tags.byteCount;
+
+					if (!in->valid &&	/* have not got an object header yet */
+					    in->variant.fileVariant.scannedFileSize < endpos) {
+						in->variant.fileVariant.scannedFileSize = endpos;
+						in->variant.fileVariant.fileSize = endpos;
+					}
+
+				} else if (in) {
+					/* This chunk has been invalidated by a resize, or a past file deletion
+					 * so delete the chunk*/
+					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+
+				}
+			} else {
+				/* chunkId == 0, so it is an ObjectHeader.
+				 * Thus, we read in the object header and make the object
+				 */
+				foundChunksInBlock = 1;
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				oh = NULL;
+				in = NULL;
+
+				if (tags.extraHeaderInfoAvailable) {
+					in = yaffs_FindOrCreateObjectByNumber(dev,
+						tags.objectId,
+						tags.extraObjectType);
+					if (!in)
+						alloc_failed = 1;
+				}
+
+				if (!in ||
+				    (!in->valid && dev->param.disableLazyLoad) ||
+				    tags.extraShadows ||
+				    (!in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
+
+					/* If we don't have  valid info then we need to read the chunk
+					 * TODO In future we can probably defer reading the chunk and
+					 * living with invalid data until needed.
+					 */
+
+					result = yaffs_ReadChunkWithTagsFromNAND(dev,
+									chunk,
+									chunkData,
+									NULL);
+
+					oh = (yaffs_ObjectHeader *) chunkData;
+
+					if (dev->param.inbandTags) {
+						/* Fix up the header if they got corrupted by inband tags */
+						oh->shadowsObject = oh->inbandShadowsObject;
+						oh->isShrink = oh->inbandIsShrink;
+					}
+
+					if (!in) {
+						in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
+						if (!in)
+							alloc_failed = 1;
+					}
+
+				}
+
+				if (!in) {
+					/* TODO Hoosterman we have a problem! */
+					T(YAFFS_TRACE_ERROR,
+					  (TSTR
+					   ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
+					    TENDSTR), tags.objectId, chunk));
+					continue;
+				}
+
+				if (in->valid) {
+					/* We have already filled this one.
+					 * We have a duplicate that will be discarded, but
+					 * we first have to suck out resize info if it is a file.
+					 */
+
+					if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
+					     ((oh &&
+					       oh->type == YAFFS_OBJECT_TYPE_FILE) ||
+					      (tags.extraHeaderInfoAvailable  &&
+					       tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
+						__u32 thisSize =
+						    (oh) ? oh->fileSize : tags.
+						    extraFileLength;
+						__u32 parentObjectId =
+						    (oh) ? oh->
+						    parentObjectId : tags.
+						    extraParentObjectId;
+
+
+						isShrink =
+						    (oh) ? oh->isShrink : tags.
+						    extraIsShrinkHeader;
+
+						/* If it is deleted (unlinked at start also means deleted)
+						 * we treat the file size as being zeroed at this point.
+						 */
+						if (parentObjectId ==
+						    YAFFS_OBJECTID_DELETED
+						    || parentObjectId ==
+						    YAFFS_OBJECTID_UNLINKED) {
+							thisSize = 0;
+							isShrink = 1;
+						}
+
+						if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
+							in->variant.fileVariant.shrinkSize = thisSize;
+
+						if (isShrink)
+							bi->hasShrinkHeader = 1;
+
+					}
+					/* Use existing - destroy this one. */
+					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+
+				}
+
+				if (!in->valid && in->variantType !=
+				    (oh ? oh->type : tags.extraObjectType))
+					T(YAFFS_TRACE_ERROR, (
+						TSTR("yaffs tragedy: Bad object type, "
+					    TCONT("%d != %d, for object %d at chunk ")
+					    TCONT("%d during scan")
+						TENDSTR), oh ?
+					    oh->type : tags.extraObjectType,
+					    in->variantType, tags.objectId,
+					    chunk));
+
+				if (!in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId ==
+				     YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle with directory structure */
+					in->valid = 1;
+
+					if (oh) {
+
+						in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+						in->win_atime[0] = oh->win_atime[0];
+						in->win_ctime[0] = oh->win_ctime[0];
+						in->win_mtime[0] = oh->win_mtime[0];
+						in->win_atime[1] = oh->win_atime[1];
+						in->win_ctime[1] = oh->win_ctime[1];
+						in->win_mtime[1] = oh->win_mtime[1];
+#else
+						in->yst_uid = oh->yst_uid;
+						in->yst_gid = oh->yst_gid;
+						in->yst_atime = oh->yst_atime;
+						in->yst_mtime = oh->yst_mtime;
+						in->yst_ctime = oh->yst_ctime;
+						in->yst_rdev = oh->yst_rdev;
+
+						in->lazyLoaded = 0;
+
+#endif
+					} else
+						in->lazyLoaded = 1;
+
+					in->hdrChunk = chunk;
+
+				} else if (!in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->hdrChunk = chunk;
+
+					if (oh) {
+						in->variantType = oh->type;
+
+						in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+						in->win_atime[0] = oh->win_atime[0];
+						in->win_ctime[0] = oh->win_ctime[0];
+						in->win_mtime[0] = oh->win_mtime[0];
+						in->win_atime[1] = oh->win_atime[1];
+						in->win_ctime[1] = oh->win_ctime[1];
+						in->win_mtime[1] = oh->win_mtime[1];
+#else
+						in->yst_uid = oh->yst_uid;
+						in->yst_gid = oh->yst_gid;
+						in->yst_atime = oh->yst_atime;
+						in->yst_mtime = oh->yst_mtime;
+						in->yst_ctime = oh->yst_ctime;
+						in->yst_rdev = oh->yst_rdev;
+#endif
+
+						if (oh->shadowsObject > 0)
+							yaffs_HandleShadowedObject(dev,
+									   oh->
+									   shadowsObject,
+									   1);
+							
+
+
+						yaffs_SetObjectNameFromOH(in, oh);
+						parent =
+						    yaffs_FindOrCreateObjectByNumber
+							(dev, oh->parentObjectId,
+							 YAFFS_OBJECT_TYPE_DIRECTORY);
+
+						 fileSize = oh->fileSize;
+						 isShrink = oh->isShrink;
+						 equivalentObjectId = oh->equivalentObjectId;
+
+					} else {
+						in->variantType = tags.extraObjectType;
+						parent =
+						    yaffs_FindOrCreateObjectByNumber
+							(dev, tags.extraParentObjectId,
+							 YAFFS_OBJECT_TYPE_DIRECTORY);
+						 fileSize = tags.extraFileLength;
+						 isShrink = tags.extraIsShrinkHeader;
+						 equivalentObjectId = tags.extraEquivalentObjectId;
+						in->lazyLoaded = 1;
+
+					}
+					in->dirty = 0;
+
+					if (!parent)
+						alloc_failed = 1;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					if (parent && parent->variantType ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variantType =
+							YAFFS_OBJECT_TYPE_DIRECTORY;
+						YINIT_LIST_HEAD(&parent->variant.
+							directoryVariant.
+							children);
+					} else if (!parent || parent->variantType !=
+						   YAFFS_OBJECT_TYPE_DIRECTORY) {
+						/* Hoosterman, another problem....
+						 * We're trying to use a non-directory as a directory
+						 */
+
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR
+						   ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+						    TENDSTR)));
+						parent = dev->lostNFoundDir;
+					}
+
+					yaffs_AddObjectToDirectory(parent, in);
+
+					itsUnlinked = (parent == dev->deletedDir) ||
+						      (parent == dev->unlinkedDir);
+
+					if (isShrink) {
+						/* Mark the block as having a shrinkHeader */
+						bi->hasShrinkHeader = 1;
+					}
+
+					/* Note re hardlinks.
+					 * Since we might scan a hardlink before its equivalent object is scanned
+					 * we put them all in a list.
+					 * After scanning is complete, we should have all the objects, so we run
+					 * through this list and fix up all the chains.
+					 */
+
+					switch (in->variantType) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+
+						if (in->variant.fileVariant.
+						    scannedFileSize < fileSize) {
+							/* This covers the case where the file size is greater
+							 * than where the data is
+							 * This will happen if the file is resized to be larger
+							 * than its current data extents.
+							 */
+							in->variant.fileVariant.fileSize = fileSize;
+							in->variant.fileVariant.scannedFileSize = fileSize;
+						}
+
+						if (in->variant.fileVariant.shrinkSize > fileSize)
+							in->variant.fileVariant.shrinkSize = fileSize;
+				
+
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						if (!itsUnlinked) {
+							in->variant.hardLinkVariant.equivalentObjectId =
+								equivalentObjectId;
+							in->hardLinks.next =
+								(struct ylist_head *) hardList;
+							hardList = in;
+						}
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:
+						if (oh) {
+							in->variant.symLinkVariant.alias =
+								yaffs_CloneString(oh->alias);
+							if (!in->variant.symLinkVariant.alias)
+								alloc_failed = 1;
+						}
+						break;
+					}
+
+				}
+
+			}
+
+		} /* End of scanning for each chunk */
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			/* If we got this far while scanning, then the block is fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+
+		bi->blockState = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_BlockBecameDirty(dev, blk);
+		}
+
+	}
+	
+	yaffs_SkipRestOfBlock(dev);
+
+	if (altBlockIndex)
+		YFREE_ALT(blockIndex);
+	else
+		YFREE(blockIndex);
+
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add these
+	 * hardlinks.
+	 */
+	yaffs_HardlinkFixup(dev, hardList);
+
+
+	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	T(YAFFS_TRACE_SCAN, (TSTR("yaffs2_ScanBackwards ends" TENDSTR)));
+
+	return YAFFS_OK;
+}
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.h
@@ -0,0 +1,36 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __YAFFS_YAFFS2_H__
+#define __YAFFS_YAFFS2_H__
+
+#include "yaffs_guts.h"
+
+void yaffs2_CalcOldestDirtySequence(yaffs_Device *dev);
+void yaffs2_FindOldestDirtySequence(yaffs_Device *dev);
+void yaffs2_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi);
+void yaffs2_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi);
+int yaffs2_BlockNotDisqualifiedFromGC(yaffs_Device *dev, yaffs_BlockInfo *bi);
+__u32 yaffs2_FindRefreshBlock(yaffs_Device *dev);
+int yaffs2_CheckpointRequired(yaffs_Device *dev);
+int yaffs2_CalcCheckpointBlocksRequired(yaffs_Device *dev);
+
+
+void yaffs2_InvalidateCheckpoint(yaffs_Device *dev);
+int yaffs2_CheckpointSave(yaffs_Device *dev);
+int yaffs2_CheckpointRestore(yaffs_Device *dev);
+
+int yaffs2_HandleHole(yaffs_Object *obj, loff_t newSize);
+int yaffs2_ScanBackwards(yaffs_Device *dev);
+
+#endif
--- a/fs/yaffs2/yportenv.h
+++ b/fs/yaffs2/yportenv.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -41,12 +41,14 @@
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
 #include <linux/config.h>
 #endif
+
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
+#include <linux/xattr.h>
 
 #define YCHAR char
 #define YUCHAR unsigned char
@@ -55,11 +57,11 @@
 #define yaffs_strcpy(a, b)     strcpy(a, b)
 #define yaffs_strncpy(a, b, c) strncpy(a, b, c)
 #define yaffs_strncmp(a, b, c) strncmp(a, b, c)
-#define yaffs_strlen(s)	       strlen(s)
+#define yaffs_strnlen(s,m)	strnlen(s,m)
 #define yaffs_sprintf	       sprintf
 #define yaffs_toupper(a)       toupper(a)
 
-#define Y_INLINE inline
+#define Y_INLINE __inline__
 
 #define YAFFS_LOSTNFOUND_NAME		"lost+found"
 #define YAFFS_LOSTNFOUND_PREFIX		"obj"
@@ -71,11 +73,11 @@
 #define YFREE_ALT(x)   vfree(x)
 #define YMALLOC_DMA(x) YMALLOC(x)
 
-/* KR - added for use in scan so processes aren't blocked indefinitely. */
 #define YYIELD() schedule()
+#define Y_DUMP_STACK() dump_stack()
 
-#define YAFFS_ROOT_MODE			0666
-#define YAFFS_LOSTNFOUND_MODE		0666
+#define YAFFS_ROOT_MODE			0755
+#define YAFFS_LOSTNFOUND_MODE		0700
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 #define Y_CURRENT_TIME CURRENT_TIME.tv_sec
@@ -89,15 +91,10 @@
 #define yaffs_strcmp(a, b) strcmp(a, b)
 
 #define TENDSTR "\n"
-#define TSTR(x) KERN_WARNING x
+#define TSTR(x) KERN_DEBUG x
 #define TCONT(x) x
 #define TOUT(p) printk p
 
-#define yaffs_trace(mask, fmt, args...) \
-	do { if ((mask) & (yaffs_traceMask|YAFFS_TRACE_ERROR)) \
-		printk(KERN_WARNING "yaffs: " fmt, ## args); \
-	} while (0)
-
 #define compile_time_assertion(assertion) \
 	({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
 
@@ -116,7 +113,6 @@
 #include "stdio.h"
 #include "string.h"
 
-#include "devextras.h"
 
 #define YMALLOC(x) malloc(x)
 #define YFREE(x)   free(x)
@@ -129,7 +125,7 @@
 #define yaffs_strcat(a, b)     strcat(a, b)
 #define yaffs_strcpy(a, b)     strcpy(a, b)
 #define yaffs_strncpy(a, b, c) strncpy(a, b, c)
-#define yaffs_strlen(s)	       strlen(s)
+#define yaffs_strnlen(s,m)	       strnlen(s,m)
 #define yaffs_sprintf	       sprintf
 #define yaffs_toupper(a)       toupper(a)
 
@@ -146,8 +142,8 @@
 #define YAFFS_LOSTNFOUND_PREFIX		"obj"
 /* #define YPRINTF(x) printf x */
 
-#define YAFFS_ROOT_MODE				0666
-#define YAFFS_LOSTNFOUND_MODE		0666
+#define YAFFS_ROOT_MODE			0755
+#define YAFFS_LOSTNFOUND_MODE		0700
 
 #define yaffs_SumCompare(x, y) ((x) == (y))
 #define yaffs_strcmp(a, b) strcmp(a, b)
@@ -158,46 +154,180 @@
 
 #endif
 
-/* see yaffs_fs.c */
-extern unsigned int yaffs_traceMask;
-extern unsigned int yaffs_wr_attempts;
+#if defined(CONFIG_YAFFS_DIRECT) || defined(CONFIG_YAFFS_WINCE)
 
-/*
- * Tracing flags.
- * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
- */
+#ifdef CONFIG_YAFFSFS_PROVIDE_VALUES
+
+#ifndef O_RDONLY
+#define O_RDONLY        00
+#endif
+
+#ifndef O_WRONLY
+#define O_WRONLY	01
+#endif
+
+#ifndef O_RDWR
+#define O_RDWR		02
+#endif
+
+#ifndef O_CREAT		
+#define O_CREAT 	0100
+#endif
+
+#ifndef O_EXCL
+#define O_EXCL		0200
+#endif
+
+#ifndef O_TRUNC
+#define O_TRUNC		01000
+#endif
+
+#ifndef O_APPEND
+#define O_APPEND	02000
+#endif
+
+#ifndef SEEK_SET
+#define SEEK_SET	0
+#endif
+
+#ifndef SEEK_CUR
+#define SEEK_CUR	1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END	2
+#endif
+
+#ifndef EBUSY
+#define EBUSY	16
+#endif
+
+#ifndef ENODEV
+#define ENODEV	19
+#endif
+
+#ifndef EINVAL
+#define EINVAL	22
+#endif
+
+#ifndef EBADF
+#define EBADF	9
+#endif
+
+#ifndef EACCES
+#define EACCES	13
+#endif
+
+#ifndef EXDEV	
+#define EXDEV	18
+#endif
+
+#ifndef ENOENT
+#define ENOENT	2
+#endif
+
+#ifndef ENOSPC
+#define ENOSPC	28
+#endif
+
+#ifndef ERANGE
+#define ERANGE 34
+#endif
+
+#ifndef ENODATA
+#define ENODATA 61
+#endif
+
+#ifndef ENOTEMPTY
+#define ENOTEMPTY 39
+#endif
+
+#ifndef ENAMETOOLONG
+#define ENAMETOOLONG 36
+#endif
+
+#ifndef ENOMEM
+#define ENOMEM 12
+#endif
+
+#ifndef EEXIST
+#define EEXIST 17
+#endif
+
+#ifndef ENOTDIR
+#define ENOTDIR 20
+#endif
+
+#ifndef EISDIR
+#define EISDIR 21
+#endif
+
+
+// Mode flags
+
+#ifndef S_IFMT
+#define S_IFMT		0170000
+#endif
+
+#ifndef S_IFLNK
+#define S_IFLNK		0120000
+#endif
 
-#define YAFFS_TRACE_OS			0x00000002
-#define YAFFS_TRACE_ALLOCATE		0x00000004
-#define YAFFS_TRACE_SCAN		0x00000008
-#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
-#define YAFFS_TRACE_ERASE		0x00000020
-#define YAFFS_TRACE_GC			0x00000040
-#define YAFFS_TRACE_WRITE		0x00000080
-#define YAFFS_TRACE_TRACING		0x00000100
-#define YAFFS_TRACE_DELETION		0x00000200
-#define YAFFS_TRACE_BUFFERS		0x00000400
-#define YAFFS_TRACE_NANDACCESS		0x00000800
-#define YAFFS_TRACE_GC_DETAIL		0x00001000
-#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
-#define YAFFS_TRACE_MTD			0x00004000
-#define YAFFS_TRACE_CHECKPOINT		0x00008000
-
-#define YAFFS_TRACE_VERIFY		0x00010000
-#define YAFFS_TRACE_VERIFY_NAND		0x00020000
-#define YAFFS_TRACE_VERIFY_FULL		0x00040000
-#define YAFFS_TRACE_VERIFY_ALL		0x000F0000
-
-
-#define YAFFS_TRACE_ERROR		0x40000000
-#define YAFFS_TRACE_BUG			0x80000000
-#define YAFFS_TRACE_ALWAYS		0xF0000000
+#ifndef S_IFDIR
+#define S_IFDIR		0040000
+#endif
+
+#ifndef S_IFREG
+#define S_IFREG		0100000
+#endif
 
+#ifndef S_IREAD 
+#define S_IREAD		0000400
+#endif
+
+#ifndef S_IWRITE
+#define	S_IWRITE	0000200
+#endif
 
-#define T(mask, p) do { if ((mask) & (yaffs_traceMask | YAFFS_TRACE_ALWAYS)) TOUT(p); } while (0)
+#ifndef S_IEXEC
+#define	S_IEXEC	0000100
+#endif
+
+#ifndef XATTR_CREATE
+#define XATTR_CREATE 1
+#endif
+
+#ifndef XATTR_REPLACE
+#define XATTR_REPLACE 2
+#endif
+
+#ifndef R_OK
+#define R_OK	4
+#define W_OK	2
+#define X_OK	1
+#define F_OK	0
+#endif
+
+#else
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#endif
+
+#endif
+
+#ifndef Y_DUMP_STACK
+#define Y_DUMP_STACK() do { } while (0)
+#endif
 
 #ifndef YBUG
-#define YBUG() do {T(YAFFS_TRACE_BUG, (TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR), __LINE__)); } while (0)
+#define YBUG() do {\
+	T(YAFFS_TRACE_BUG,\
+		(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),\
+		__LINE__));\
+	Y_DUMP_STACK();\
+} while (0)
 #endif
 
+
 #endif