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openwrt-xburst/target/linux/generic/files/fs/yaffs2/yaffs_guts.h
juhosg 34b60fad1a generic: fold yaffs_git_2010_10_20 patch to generic/files 
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34013 3c298f89-4303-0410-b956-a3cf2f4a3e73
2012-10-30 14:58:17 +00:00

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/*
* 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_GUTS_H__
#define __YAFFS_GUTS_H__
#include "yportenv.h"
#include "devextras.h"
#include "yaffs_list.h"
#define YAFFS_OK 1
#define YAFFS_FAIL 0
/* Give us a Y=0x59,
* Give us an A=0x41,
* Give us an FF=0xFF
* Give us an S=0x53
* And what have we got...
*/
#define YAFFS_MAGIC 0x5941FF53
#define YAFFS_NTNODES_LEVEL0 16
#define YAFFS_TNODES_LEVEL0_BITS 4
#define YAFFS_TNODES_LEVEL0_MASK 0xf
#define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2)
#define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1)
#define YAFFS_TNODES_INTERNAL_MASK 0x7
#define YAFFS_TNODES_MAX_LEVEL 6
#ifndef CONFIG_YAFFS_NO_YAFFS1
#define YAFFS_BYTES_PER_SPARE 16
#define YAFFS_BYTES_PER_CHUNK 512
#define YAFFS_CHUNK_SIZE_SHIFT 9
#define YAFFS_CHUNKS_PER_BLOCK 32
#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
#endif
#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024
#define YAFFS_MIN_YAFFS2_SPARE_SIZE 32
#define YAFFS_MAX_CHUNK_ID 0x000FFFFF
#define YAFFS_ALLOCATION_NOBJECTS 100
#define YAFFS_ALLOCATION_NTNODES 100
#define YAFFS_ALLOCATION_NLINKS 100
#define YAFFS_NOBJECT_BUCKETS 256
#define YAFFS_OBJECT_SPACE 0x40000
#define YAFFS_MAX_OBJECT_ID (YAFFS_OBJECT_SPACE -1)
#define YAFFS_CHECKPOINT_VERSION 4
#ifdef CONFIG_YAFFS_UNICODE
#define YAFFS_MAX_NAME_LENGTH 127
#define YAFFS_MAX_ALIAS_LENGTH 79
#else
#define YAFFS_MAX_NAME_LENGTH 255
#define YAFFS_MAX_ALIAS_LENGTH 159
#endif
#define YAFFS_SHORT_NAME_LENGTH 15
/* Some special object ids for pseudo objects */
#define YAFFS_OBJECTID_ROOT 1
#define YAFFS_OBJECTID_LOSTNFOUND 2
#define YAFFS_OBJECTID_UNLINKED 3
#define YAFFS_OBJECTID_DELETED 4
/* 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
#define YAFFS_N_TEMP_BUFFERS 6
/* We limit the number attempts at sucessfully saving a chunk of data.
* Small-page devices have 32 pages per block; large-page devices have 64.
* Default to something in the order of 5 to 10 blocks worth of chunks.
*/
#define YAFFS_WR_ATTEMPTS (5*64)
/* Sequence numbers are used in YAFFS2 to determine block allocation order.
* The range is limited slightly to help distinguish bad numbers from good.
* This also allows us to perhaps in the future use special numbers for
* special purposes.
* EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years,
* and is a larger number than the lifetime of a 2GB device.
*/
#define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000
#define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xEFFFFF00
/* Special sequence number for bad block that failed to be marked bad */
#define YAFFS_SEQUENCE_BAD_BLOCK 0xFFFF0000
/* ChunkCache is used for short read/write operations.*/
typedef struct {
struct yaffs_obj_s *object;
int chunk_id;
int last_use;
int dirty;
int n_bytes; /* Only valid if the cache is dirty */
int locked; /* Can't push out or flush while locked. */
__u8 *data;
} yaffs_cache_t;
/* Tags structures in RAM
* NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
* the structure size will get blown out.
*/
#ifndef CONFIG_YAFFS_NO_YAFFS1
typedef struct {
unsigned chunk_id:20;
unsigned serial_number:2;
unsigned n_bytes_lsb:10;
unsigned obj_id:18;
unsigned ecc:12;
unsigned n_bytes_msb:2;
} yaffs_tags_t;
typedef union {
yaffs_tags_t as_tags;
__u8 as_bytes[8];
} yaffs_tags_union_t;
#endif
/* Stuff used for extended tags in YAFFS2 */
typedef enum {
YAFFS_ECC_RESULT_UNKNOWN,
YAFFS_ECC_RESULT_NO_ERROR,
YAFFS_ECC_RESULT_FIXED,
YAFFS_ECC_RESULT_UNFIXED
} yaffs_ecc_result;
typedef enum {
YAFFS_OBJECT_TYPE_UNKNOWN,
YAFFS_OBJECT_TYPE_FILE,
YAFFS_OBJECT_TYPE_SYMLINK,
YAFFS_OBJECT_TYPE_DIRECTORY,
YAFFS_OBJECT_TYPE_HARDLINK,
YAFFS_OBJECT_TYPE_SPECIAL
} yaffs_obj_type;
#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
typedef struct {
unsigned validity1;
unsigned chunk_used; /* Status of the chunk: used or unused */
unsigned obj_id; /* If 0 then this is not part of an object (unused) */
unsigned chunk_id; /* If 0 then this is a header, else a data chunk */
unsigned n_bytes; /* Only valid for data chunks */
/* The following stuff only has meaning when we read */
yaffs_ecc_result ecc_result;
unsigned block_bad;
/* YAFFS 1 stuff */
unsigned is_deleted; /* The chunk is marked deleted */
unsigned serial_number; /* Yaffs1 2-bit serial number */
/* YAFFS2 stuff */
unsigned seq_number; /* The sequence number of this block */
/* Extra info if this is an object header (YAFFS2 only) */
unsigned extra_available; /* There is extra info available if this is not zero */
unsigned extra_parent_id; /* The parent object */
unsigned extra_is_shrink; /* Is it a shrink header? */
unsigned extra_shadows; /* Does this shadow another object? */
yaffs_obj_type extra_obj_type; /* What object type? */
unsigned extra_length; /* Length if it is a file */
unsigned extra_equiv_id; /* Equivalent object Id if it is a hard link */
unsigned validty1;
} yaffs_ext_tags;
/* Spare structure for YAFFS1 */
typedef struct {
__u8 tb0;
__u8 tb1;
__u8 tb2;
__u8 tb3;
__u8 page_status; /* set to 0 to delete the chunk */
__u8 block_status;
__u8 tb4;
__u8 tb5;
__u8 ecc1[3];
__u8 tb6;
__u8 tb7;
__u8 ecc2[3];
} yaffs_spare;
/*Special structure for passing through to mtd */
struct yaffs_nand_spare {
yaffs_spare spare;
int eccres1;
int eccres2;
};
/* Block data in RAM */
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.
* This state is only valid during yaffs_Scan.
* NB We tolerate empty because the pre-scanner might be incapable of deciding
* However, if this state is returned on a YAFFS2 device, then we expect a sequence number
*/
YAFFS_BLOCK_STATE_EMPTY,
/* This block is empty */
YAFFS_BLOCK_STATE_ALLOCATING,
/* 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.
* 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,
/* 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. */
YAFFS_BLOCK_STATE_COLLECTING,
/* This block is being garbage collected */
YAFFS_BLOCK_STATE_DEAD
/* This block has failed and is not in use */
} yaffs_block_state_t;
#define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
typedef struct {
int soft_del_pages:10; /* number of soft deleted pages */
int pages_in_use:10; /* number of pages in use */
unsigned block_state:4; /* One of the above block states. NB use unsigned because enum is sometimes an int */
__u32 needs_retiring:1; /* Data has failed on this block, need to get valid data off */
/* and retire the block. */
__u32 skip_erased_check:1; /* If this is set we can skip the erased check on this block */
__u32 gc_prioritise:1; /* An ECC check or blank check has failed on this block.
It should be prioritised for GC */
__u32 chunk_error_strikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */
#ifdef CONFIG_YAFFS_YAFFS2
__u32 has_shrink_hdr:1; /* This block has at least one shrink object header */
__u32 seq_number; /* block sequence number for yaffs2 */
#endif
} yaffs_block_info_t;
/* -------------------------- Object structure -------------------------------*/
/* This is the object structure as stored on NAND */
typedef struct {
yaffs_obj_type type;
/* Apply to everything */
int parent_obj_id;
__u16 sum_no_longer_used; /* checksum of name. No longer used */
YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
/* The following apply to directories, files, symlinks - not hard links */
__u32 yst_mode; /* protection */
#ifdef CONFIG_YAFFS_WINCE
__u32 not_for_wince[5];
#else
__u32 yst_uid;
__u32 yst_gid;
__u32 yst_atime;
__u32 yst_mtime;
__u32 yst_ctime;
#endif
/* File size applies to files only */
int file_size;
/* Equivalent object id applies to hard links only. */
int equiv_id;
/* Alias is for symlinks only. */
YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
__u32 yst_rdev; /* device stuff for block and char devices (major/min) */
#ifdef CONFIG_YAFFS_WINCE
__u32 win_ctime[2];
__u32 win_atime[2];
__u32 win_mtime[2];
#else
__u32 room_to_grow[6];
#endif
__u32 inband_shadowed_obj_id;
__u32 inband_is_shrink;
__u32 reserved[2];
int shadows_obj; /* This object header shadows the specified object if > 0 */
/* is_shrink applies to object headers written when we shrink the file (ie resize) */
__u32 is_shrink;
} yaffs_obj_header;
/*--------------------------- Tnode -------------------------- */
union yaffs_tnode_union {
union yaffs_tnode_union *internal[YAFFS_NTNODES_INTERNAL];
};
typedef union yaffs_tnode_union yaffs_tnode_t;
/*------------------------ Object -----------------------------*/
/* An object can be one of:
* - a directory (no data, has children links
* - a regular file (data.... not prunes :->).
* - a symlink [symbolic link] (the alias).
* - a hard link
*/
typedef struct {
__u32 file_size;
__u32 scanned_size;
__u32 shrink_size;
int top_level;
yaffs_tnode_t *top;
} yaffs_file_s;
typedef struct {
struct ylist_head children; /* list of child links */
struct ylist_head dirty; /* Entry for list of dirty directories */
} yaffs_dir_s;
typedef struct {
YCHAR *alias;
} yaffs_symlink_t;
typedef struct {
struct yaffs_obj_s *equiv_obj;
__u32 equiv_id;
} yaffs_hard_link_s;
typedef union {
yaffs_file_s file_variant;
yaffs_dir_s dir_variant;
yaffs_symlink_t symlink_variant;
yaffs_hard_link_s hardlink_variant;
} yaffs_obj_variant;
struct yaffs_obj_s {
__u8 deleted:1; /* This should only apply to unlinked files. */
__u8 soft_del:1; /* it has also been soft deleted */
__u8 unlinked:1; /* An unlinked file. The file should be in the unlinked directory.*/
__u8 fake:1; /* A fake object has no presence on NAND. */
__u8 rename_allowed:1; /* Some objects are not allowed to be renamed. */
__u8 unlink_allowed:1;
__u8 dirty:1; /* the object needs to be written to flash */
__u8 valid:1; /* When the file system is being loaded up, this
* object might be created before the data
* is available (ie. file data records appear before the header).
*/
__u8 lazy_loaded:1; /* This object has been lazy loaded and is missing some detail */
__u8 defered_free:1; /* For Linux kernel. Object is removed from NAND, but is
* still in the inode cache. Free of object is defered.
* until the inode is released.
*/
__u8 being_created:1; /* This object is still being created so skip some checks. */
__u8 is_shadowed:1; /* This object is shadowed on the way to being renamed. */
__u8 xattr_known:1; /* We know if this has object has xattribs or not. */
__u8 has_xattr:1; /* This object has xattribs. Valid if xattr_known. */
__u8 serial; /* serial number of chunk in NAND. Cached here */
__u16 sum; /* sum of the name to speed searching */
struct yaffs_dev_s *my_dev; /* The device I'm on */
struct ylist_head hash_link; /* list of objects in this hash bucket */
struct ylist_head hard_links; /* all the equivalent hard linked objects */
/* directory structure stuff */
/* also used for linking up the free list */
struct yaffs_obj_s *parent;
struct ylist_head siblings;
/* Where's my object header in NAND? */
int hdr_chunk;
int n_data_chunks; /* Number of data chunks attached to the file. */
__u32 obj_id; /* the object id value */
__u32 yst_mode;
#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
#endif
#ifdef CONFIG_YAFFS_WINCE
__u32 win_ctime[2];
__u32 win_mtime[2];
__u32 win_atime[2];
#else
__u32 yst_uid;
__u32 yst_gid;
__u32 yst_atime;
__u32 yst_mtime;
__u32 yst_ctime;
#endif
__u32 yst_rdev;
void *my_inode;
yaffs_obj_type variant_type;
yaffs_obj_variant variant;
};
typedef struct yaffs_obj_s yaffs_obj_t;
typedef struct {
struct ylist_head list;
int count;
} yaffs_obj_bucket;
/* yaffs_checkpt_obj_t holds the definition of an object as dumped
* by checkpointing.
*/
typedef struct {
int struct_type;
__u32 obj_id;
__u32 parent_id;
int hdr_chunk;
yaffs_obj_type variant_type:3;
__u8 deleted:1;
__u8 soft_del:1;
__u8 unlinked:1;
__u8 fake:1;
__u8 rename_allowed:1;
__u8 unlink_allowed:1;
__u8 serial;
int n_data_chunks;
__u32 size_or_equiv_obj;
} yaffs_checkpt_obj_t;
/*--------------------- Temporary buffers ----------------
*
* These are chunk-sized working buffers. Each device has a few
*/
typedef struct {
__u8 *buffer;
int line; /* track from whence this buffer was allocated */
int max_line;
} yaffs_buffer_t;
/*----------------- Device ---------------------------------*/
struct yaffs_param_s {
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 inband_tags; /* Use unband tags */
__u32 total_bytes_per_chunk; /* Should be >= 512, does not need to be a power of 2 */
int chunks_per_block; /* does not need to be a power of 2 */
int spare_bytes_per_chunk; /* spare area size */
int start_block; /* Start block we're allowed to use */
int end_block; /* End block we're allowed to use */
int n_reserved_blocks; /* We want this tuneable so that we can reduce */
/* reserved blocks on NOR and RAM. */
int n_caches; /* If <= 0, then short op caching is disabled, else
* the number of short op caches (don't use too many).
* 10 to 20 is a good bet.
*/
int use_nand_ecc; /* Flag to decide whether or not to use NANDECC on data (yaffs1) */
int no_tags_ecc; /* Flag to decide whether or not to do ECC on packed tags (yaffs2) */
int is_yaffs2; /* Use yaffs2 mode on this device */
int empty_lost_n_found; /* Auto-empty lost+found directory on mount */
int refresh_period; /* How often we should check to do a block refresh */
/* Checkpoint control. Can be set before or after initialisation */
__u8 skip_checkpt_rd;
__u8 skip_checkpt_wr;
int enable_xattr; /* Enable xattribs */
/* NAND access functions (Must be set before calling YAFFS)*/
int (*write_chunk_fn) (struct yaffs_dev_s *dev,
int nand_chunk, const __u8 *data,
const yaffs_spare *spare);
int (*read_chunk_fn) (struct yaffs_dev_s *dev,
int nand_chunk, __u8 *data,
yaffs_spare *spare);
int (*erase_fn) (struct yaffs_dev_s *dev,
int flash_block);
int (*initialise_flash_fn) (struct yaffs_dev_s *dev);
int (*deinitialise_flash_fn) (struct yaffs_dev_s *dev);
#ifdef CONFIG_YAFFS_YAFFS2
int (*write_chunk_tags_fn) (struct yaffs_dev_s *dev,
int nand_chunk, const __u8 *data,
const yaffs_ext_tags *tags);
int (*read_chunk_tags_fn) (struct yaffs_dev_s *dev,
int nand_chunk, __u8 *data,
yaffs_ext_tags *tags);
int (*bad_block_fn) (struct yaffs_dev_s *dev, int block_no);
int (*query_block_fn) (struct yaffs_dev_s *dev, int block_no,
yaffs_block_state_t *state, __u32 *seq_number);
#endif
/* The remove_obj_fn function must be supplied by OS flavours that
* need it.
* yaffs direct uses it to implement the faster readdir.
* Linux uses it to protect the directory during unlocking.
*/
void (*remove_obj_fn)(struct yaffs_obj_s *obj);
/* Callback to mark the superblock dirty */
void (*sb_dirty_fn)(struct yaffs_dev_s *dev);
/* Callback to control garbage collection. */
unsigned (*gc_control)(struct yaffs_dev_s *dev);
/* Debug control flags. Don't use unless you know what you're doing */
int use_header_file_size; /* Flag to determine if we should use file sizes from the header */
int disable_lazy_load; /* Disable lazy loading on this device */
int wide_tnodes_disabled; /* Set to disable wide tnodes */
int disable_soft_del; /* yaffs 1 only: Set to disable the use of softdeletion. */
int defered_dir_update; /* Set to defer directory updates */
#ifdef CONFIG_YAFFS_AUTO_UNICODE
int auto_unicode;
#endif
int always_check_erased; /* Force chunk erased check always on */
};
typedef struct yaffs_param_s yaffs_param_t;
struct yaffs_dev_s {
struct yaffs_param_s param;
/* Context storage. Holds extra OS specific data for this device */
void *os_context;
void *driver_context;
struct ylist_head dev_list;
/* Runtime parameters. Set up by YAFFS. */
int data_bytes_per_chunk;
/* Non-wide tnode stuff */
__u16 chunk_grp_bits; /* Number of bits that need to be resolved if
* the tnodes are not wide enough.
*/
__u16 chunk_grp_size; /* == 2^^chunk_grp_bits */
/* Stuff to support wide tnodes */
__u32 tnode_width;
__u32 tnode_mask;
__u32 tnode_size;
/* Stuff for figuring out file offset to chunk conversions */
__u32 chunk_shift; /* Shift value */
__u32 chunk_div; /* Divisor after shifting: 1 for power-of-2 sizes */
__u32 chunk_mask; /* Mask to use for power-of-2 case */
int is_mounted;
int read_only;
int is_checkpointed;
/* Stuff to support block offsetting to support start block zero */
int internal_start_block;
int internal_end_block;
int block_offset;
int chunk_offset;
/* Runtime checkpointing stuff */
int checkpt_page_seq; /* running sequence number of checkpoint pages */
int checkpt_byte_count;
int checkpt_byte_offs;
__u8 *checkpt_buffer;
int checkpt_open_write;
int blocks_in_checkpt;
int checkpt_cur_chunk;
int checkpt_cur_block;
int checkpt_next_block;
int *checkpt_block_list;
int checkpt_max_blocks;
__u32 checkpt_sum;
__u32 checkpt_xor;
int checkpoint_blocks_required; /* Number of blocks needed to store current checkpoint set */
/* Block Info */
yaffs_block_info_t *block_info;
__u8 *chunk_bits; /* bitmap of chunks in use */
unsigned block_info_alt:1; /* was allocated using alternative strategy */
unsigned chunk_bits_alt:1; /* was allocated using alternative strategy */
int chunk_bit_stride; /* Number of bytes of chunk_bits per block.
* Must be consistent with chunks_per_block.
*/
int n_erased_blocks;
int alloc_block; /* Current block being allocated off */
__u32 alloc_page;
int alloc_block_finder; /* Used to search for next allocation block */
/* Object and Tnode memory management */
void *allocator;
int n_obj;
int n_tnodes;
int n_hardlinks;
yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
__u32 bucket_finder;
int n_free_chunks;
/* Garbage collection control */
__u32 *gc_cleanup_list; /* objects to delete at the end of a GC. */
__u32 n_clean_ups;
unsigned has_pending_prioritised_gc; /* We think this device might have pending prioritised gcs */
unsigned gc_disable;
unsigned gc_block_finder;
unsigned gc_dirtiest;
unsigned gc_pages_in_use;
unsigned gc_not_done;
unsigned gc_block;
unsigned gc_chunk;
unsigned gc_skip;
/* Special directories */
yaffs_obj_t *root_dir;
yaffs_obj_t *lost_n_found;
/* Buffer areas for storing data to recover from write failures TODO
* __u8 buffered_data[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
* yaffs_spare buffered_spare[YAFFS_CHUNKS_PER_BLOCK];
*/
int buffered_block; /* Which block is buffered here? */
int doing_buffered_block_rewrite;
yaffs_cache_t *cache;
int cache_last_use;
/* Stuff for background deletion and unlinked files.*/
yaffs_obj_t *unlinked_dir; /* Directory where unlinked and deleted files live. */
yaffs_obj_t *del_dir; /* Directory where deleted objects are sent to disappear. */
yaffs_obj_t *unlinked_deletion; /* Current file being background deleted.*/
int n_deleted_files; /* Count of files awaiting deletion;*/
int n_unlinked_files; /* Count of unlinked files. */
int n_bg_deletions; /* Count of background deletions. */
/* Temporary buffer management */
yaffs_buffer_t temp_buffer[YAFFS_N_TEMP_BUFFERS];
int max_temp;
int temp_in_use;
int unmanaged_buffer_allocs;
int unmanaged_buffer_deallocs;
/* yaffs2 runtime stuff */
unsigned seq_number; /* Sequence number of currently allocating block */
unsigned oldest_dirty_seq;
unsigned oldest_dirty_block;
/* Block refreshing */
int refresh_skip; /* A skip down counter. Refresh happens when this gets to zero. */
/* Dirty directory handling */
struct ylist_head dirty_dirs; /* List of dirty directories */
/* Statistcs */
__u32 n_page_writes;
__u32 n_page_reads;
__u32 n_erasures;
__u32 n_erase_failures;
__u32 n_gc_copies;
__u32 all_gcs;
__u32 passive_gc_count;
__u32 oldest_dirty_gc_count;
__u32 n_gc_blocks;
__u32 bg_gcs;
__u32 n_retired_writes;
__u32 n_retired_blocks;
__u32 n_ecc_fixed;
__u32 n_ecc_unfixed;
__u32 n_tags_ecc_fixed;
__u32 n_tags_ecc_unfixed;
__u32 n_deletions;
__u32 n_unmarked_deletions;
__u32 refresh_count;
__u32 cache_hits;
};
typedef struct yaffs_dev_s yaffs_dev_t;
/* The static layout of block usage etc is stored in the super block header */
typedef struct {
int StructType;
int version;
int checkpt_start_block;
int checkpt_end_block;
int start_block;
int end_block;
int rfu[100];
} yaffs_sb_header;
/* The CheckpointDevice structure holds the device information that changes at runtime and
* must be preserved over unmount/mount cycles.
*/
typedef struct {
int struct_type;
int n_erased_blocks;
int alloc_block; /* Current block being allocated off */
__u32 alloc_page;
int n_free_chunks;
int n_deleted_files; /* Count of files awaiting deletion;*/
int n_unlinked_files; /* Count of unlinked files. */
int n_bg_deletions; /* Count of background deletions. */
/* yaffs2 runtime stuff */
unsigned seq_number; /* Sequence number of currently allocating block */
} yaffs_checkpt_dev_t;
typedef struct {
int struct_type;
__u32 magic;
__u32 version;
__u32 head;
} yaffs_checkpt_validty_t;
struct yaffs_shadow_fixer_s {
int obj_id;
int shadowed_id;
struct yaffs_shadow_fixer_s *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_xattr_mod;
/*----------------------- YAFFS Functions -----------------------*/
int yaffs_guts_initialise(yaffs_dev_t *dev);
void yaffs_deinitialise(yaffs_dev_t *dev);
int yaffs_get_n_free_chunks(yaffs_dev_t *dev);
int yaffs_rename_obj(yaffs_obj_t *old_dir, const YCHAR *old_name,
yaffs_obj_t *new_dir, const YCHAR *new_name);
int yaffs_unlinker(yaffs_obj_t *dir, const YCHAR *name);
int yaffs_del_obj(yaffs_obj_t *obj);
int yaffs_get_obj_name(yaffs_obj_t *obj, YCHAR *name, int buffer_size);
int yaffs_get_obj_length(yaffs_obj_t *obj);
int yaffs_get_obj_inode(yaffs_obj_t *obj);
unsigned yaffs_get_obj_type(yaffs_obj_t *obj);
int yaffs_get_obj_link_count(yaffs_obj_t *obj);
int yaffs_set_attribs(yaffs_obj_t *obj, struct iattr *attr);
int yaffs_get_attribs(yaffs_obj_t *obj, struct iattr *attr);
/* File operations */
int yaffs_file_rd(yaffs_obj_t *obj, __u8 *buffer, loff_t offset,
int n_bytes);
int yaffs_wr_file(yaffs_obj_t *obj, const __u8 *buffer, loff_t offset,
int n_bytes, int write_trhrough);
int yaffs_resize_file(yaffs_obj_t *obj, loff_t new_size);
yaffs_obj_t *yaffs_create_file(yaffs_obj_t *parent, const YCHAR *name,
__u32 mode, __u32 uid, __u32 gid);
int yaffs_flush_file(yaffs_obj_t *obj, int update_time, int data_sync);
/* Flushing and checkpointing */
void yaffs_flush_whole_cache(yaffs_dev_t *dev);
int yaffs_checkpoint_save(yaffs_dev_t *dev);
int yaffs_checkpoint_restore(yaffs_dev_t *dev);
/* Directory operations */
yaffs_obj_t *yaffs_create_dir(yaffs_obj_t *parent, const YCHAR *name,
__u32 mode, __u32 uid, __u32 gid);
yaffs_obj_t *yaffs_find_by_name(yaffs_obj_t *the_dir, const YCHAR *name);
int yaffs_ApplyToDirectoryChildren(yaffs_obj_t *the_dir,
int (*fn) (yaffs_obj_t *));
yaffs_obj_t *yaffs_find_by_number(yaffs_dev_t *dev, __u32 number);
/* Link operations */
yaffs_obj_t *yaffs_link_obj(yaffs_obj_t *parent, const YCHAR *name,
yaffs_obj_t *equiv_obj);
yaffs_obj_t *yaffs_get_equivalent_obj(yaffs_obj_t *obj);
/* Symlink operations */
yaffs_obj_t *yaffs_create_symlink(yaffs_obj_t *parent, const YCHAR *name,
__u32 mode, __u32 uid, __u32 gid,
const YCHAR *alias);
YCHAR *yaffs_get_symlink_alias(yaffs_obj_t *obj);
/* Special inodes (fifos, sockets and devices) */
yaffs_obj_t *yaffs_create_special(yaffs_obj_t *parent, const YCHAR *name,
__u32 mode, __u32 uid, __u32 gid, __u32 rdev);
int yaffs_set_xattrib(yaffs_obj_t *obj, const YCHAR *name, const void * value, int size, int flags);
int yaffs_get_xattrib(yaffs_obj_t *obj, const YCHAR *name, void *value, int size);
int yaffs_list_xattrib(yaffs_obj_t *obj, char *buffer, int size);
int yaffs_remove_xattrib(yaffs_obj_t *obj, const YCHAR *name);
/* Special directories */
yaffs_obj_t *yaffs_root(yaffs_dev_t *dev);
yaffs_obj_t *yaffs_lost_n_found(yaffs_dev_t *dev);
#ifdef CONFIG_YAFFS_WINCE
/* CONFIG_YAFFS_WINCE special stuff */
void yfsd_win_file_time_now(__u32 target[2]);
#endif
void yaffs_handle_defered_free(yaffs_obj_t *obj);
void yaffs_update_dirty_dirs(yaffs_dev_t *dev);
int yaffs_bg_gc(yaffs_dev_t *dev, unsigned urgency);
/* Debug dump */
int yaffs_dump_obj(yaffs_obj_t *obj);
void yaffs_guts_test(yaffs_dev_t *dev);
/* A few useful functions to be used within the core files*/
void yaffs_chunk_del(yaffs_dev_t *dev, int chunk_id, int mark_flash, int lyn);
int yaffs_check_ff(__u8 *buffer, int n_bytes);
void yaffs_handle_chunk_error(yaffs_dev_t *dev, yaffs_block_info_t *bi);
__u8 *yaffs_get_temp_buffer(yaffs_dev_t *dev, int line_no);
void yaffs_release_temp_buffer(yaffs_dev_t *dev, __u8 *buffer, int line_no);
yaffs_obj_t *yaffs_find_or_create_by_number(yaffs_dev_t *dev,
int number,
yaffs_obj_type type);
int yaffs_put_chunk_in_file(yaffs_obj_t *in, int inode_chunk,
int nand_chunk, int in_scan);
void yaffs_set_obj_name(yaffs_obj_t *obj, const YCHAR *name);
void yaffs_set_obj_name_from_oh(yaffs_obj_t *obj, const yaffs_obj_header *oh);
void yaffs_add_obj_to_dir(yaffs_obj_t *directory,
yaffs_obj_t *obj);
YCHAR *yaffs_clone_str(const YCHAR *str);
void yaffs_link_fixup(yaffs_dev_t *dev, yaffs_obj_t *hard_list);
void yaffs_block_became_dirty(yaffs_dev_t *dev, int block_no);
int yaffs_update_oh(yaffs_obj_t *in, const YCHAR *name,
int force, int is_shrink, int shadows,
yaffs_xattr_mod *xop);
void yaffs_handle_shadowed_obj(yaffs_dev_t *dev, int obj_id,
int backward_scanning);
int yaffs_check_alloc_available(yaffs_dev_t *dev, int n_chunks);
yaffs_tnode_t *yaffs_get_tnode(yaffs_dev_t *dev);
yaffs_tnode_t *yaffs_add_find_tnode_0(yaffs_dev_t *dev,
yaffs_file_s *file_struct,
__u32 chunk_id,
yaffs_tnode_t *passed_tn);
int yaffs_do_file_wr(yaffs_obj_t *in, const __u8 *buffer, loff_t offset,
int n_bytes, int write_trhrough);
void yaffs_resize_file_down( yaffs_obj_t *obj, loff_t new_size);
void yaffs_skip_rest_of_block(yaffs_dev_t *dev);
int yaffs_count_free_chunks(yaffs_dev_t *dev);
yaffs_tnode_t *yaffs_find_tnode_0(yaffs_dev_t *dev,
yaffs_file_s *file_struct,
__u32 chunk_id);
__u32 yaffs_get_group_base(yaffs_dev_t *dev, yaffs_tnode_t *tn, unsigned pos);
#endif
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