/* * YAFFS: Yet another Flash File System . A NAND-flash specific file system. * * Copyright (C) 2002-2007 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 "devextras.h" #include "yportenv.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_UNUSED_OBJECT_ID 0x0003FFFF #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_CHECKPOINT_VERSION 3 #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 /* Sseudo 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 4 /* 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 /* ChunkCache is used for short read/write operations.*/ typedef struct { struct yaffs_ObjectStruct *object; int chunkId; int lastUse; 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; /* 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 chunkId:20; unsigned serialNumber:2; unsigned byteCount:10; unsigned objectId:18; unsigned ecc:12; unsigned unusedStuff:2; } yaffs_Tags; typedef union { yaffs_Tags asTags; __u8 asBytes[8]; } yaffs_TagsUnion; #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_ECCResult; 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_ObjectType; #define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL typedef struct { unsigned validMarker0; unsigned chunkUsed; /* Status of the chunk: used or unused */ unsigned objectId; /* If 0 then this is not part of an object (unused) */ unsigned chunkId; /* If 0 then this is a header, else a data chunk */ unsigned byteCount; /* Only valid for data chunks */ /* The following stuff only has meaning when we read */ yaffs_ECCResult eccResult; unsigned blockBad; /* YAFFS 1 stuff */ unsigned chunkDeleted; /* The chunk is marked deleted */ unsigned serialNumber; /* Yaffs1 2-bit serial number */ /* YAFFS2 stuff */ unsigned sequenceNumber; /* The sequence number of this block */ /* Extra info if this is an object header (YAFFS2 only) */ unsigned extraHeaderInfoAvailable; /* There is extra info available if this is not zero */ unsigned extraParentObjectId; /* The parent object */ unsigned extraIsShrinkHeader; /* Is it a shrink header? */ unsigned extraShadows; /* Does this shadow another object? */ yaffs_ObjectType extraObjectType; /* What object type? */ unsigned extraFileLength; /* Length if it is a file */ unsigned extraEquivalentObjectId; /* Equivalent object Id if it is a hard link */ unsigned validMarker1; } yaffs_ExtendedTags; /* Spare structure for YAFFS1 */ typedef struct { __u8 tagByte0; __u8 tagByte1; __u8 tagByte2; __u8 tagByte3; __u8 pageStatus; /* set to 0 to delete the chunk */ __u8 blockStatus; __u8 tagByte4; __u8 tagByte5; __u8 ecc1[3]; __u8 tagByte6; __u8 tagByte7; __u8 ecc2[3]; } yaffs_Spare; /*Special structure for passing through to mtd */ struct yaffs_NANDSpare { yaffs_Spare spare; int eccres1; int eccres2; }; /* Block data in RAM */ typedef enum { YAFFS_BLOCK_STATE_UNKNOWN = 0, YAFFS_BLOCK_STATE_SCANNING, 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 */ YAFFS_BLOCK_STATE_FULL, /* All the pages in this block have been allocated. */ YAFFS_BLOCK_STATE_DIRTY, /* All pages have been allocated and 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_BlockState; #define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1) typedef struct { int softDeletions:10; /* number of soft deleted pages */ int pagesInUse:10; /* number of pages in use */ yaffs_BlockState blockState:4; /* One of the above block states */ __u32 needsRetiring:1; /* Data has failed on this block, need to get valid data off */ /* and retire the block. */ __u32 skipErasedCheck: 1; /* If this is set we can skip the erased check on this block */ __u32 gcPrioritise: 1; /* An ECC check or blank check has failed on this block. It should be prioritised for GC */ __u32 chunkErrorStrikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */ #ifdef CONFIG_YAFFS_YAFFS2 __u32 hasShrinkHeader:1; /* This block has at least one shrink object header */ __u32 sequenceNumber; /* block sequence number for yaffs2 */ #endif } yaffs_BlockInfo; /* -------------------------- Object structure -------------------------------*/ /* This is the object structure as stored on NAND */ typedef struct { yaffs_ObjectType type; /* Apply to everything */ int parentObjectId; __u16 sum__NoLongerUsed; /* checksum of name. No longer used */ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; /* Thes following apply to directories, files, symlinks - not hard links */ __u32 yst_mode; /* protection */ #ifdef CONFIG_YAFFS_WINCE __u32 notForWinCE[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 fileSize; /* Equivalent object id applies to hard links only. */ int equivalentObjectId; /* 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]; __u32 roomToGrow[4]; #else __u32 roomToGrow[10]; #endif int shadowsObject; /* This object header shadows the specified object if > 0 */ /* isShrink applies to object headers written when we shrink the file (ie resize) */ __u32 isShrink; } yaffs_ObjectHeader; /*--------------------------- 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: * - 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 fileSize; __u32 scannedFileSize; __u32 shrinkSize; int topLevel; yaffs_Tnode *top; } yaffs_FileStructure; typedef struct { struct list_head children; /* list of child links */ } yaffs_DirectoryStructure; typedef struct { YCHAR *alias; } yaffs_SymLinkStructure; typedef struct { struct yaffs_ObjectStruct *equivalentObject; __u32 equivalentObjectId; } yaffs_HardLinkStructure; typedef union { yaffs_FileStructure fileVariant; yaffs_DirectoryStructure directoryVariant; yaffs_SymLinkStructure symLinkVariant; 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 */ __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 renameAllowed:1; /* Some objects are not allowed to be renamed. */ __u8 unlinkAllowed: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 lazyLoaded:1; /* This object has been lazy loaded and is missing some detail */ __u8 deferedFree: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 serial; /* serial number of chunk in NAND. Cached here */ __u16 sum; /* sum of the name to speed searching */ struct yaffs_DeviceStruct *myDev; /* The device I'm on */ struct list_head hashLink; /* list of objects in this hash bucket */ struct list_head hardLinks; /* all the equivalent hard linked objects */ /* directory structure stuff */ /* also used for linking up the free list */ struct yaffs_ObjectStruct *parent; struct list_head siblings; /* Where's my object header in NAND? */ int chunkId; int nDataChunks; /* Number of data chunks attached to the file. */ __u32 objectId; /* the object id value */ __u32 yst_mode; #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM 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]; __u32 win_atime[2]; #else __u32 yst_uid; __u32 yst_gid; __u32 yst_atime; __u32 yst_mtime; __u32 yst_ctime; #endif __u32 yst_rdev; #ifdef __KERNEL__ struct inode *myInode; #endif yaffs_ObjectType variantType; yaffs_ObjectVariant variant; }; 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 list_head list; int count; } yaffs_ObjectBucket; /* yaffs_CheckpointObject holds the definition of an object as dumped * by checkpointing. */ typedef struct { int structType; __u32 objectId; __u32 parentId; int chunkId; yaffs_ObjectType variantType:3; __u8 deleted:1; __u8 softDeleted:1; __u8 unlinked:1; __u8 fake:1; __u8 renameAllowed:1; __u8 unlinkAllowed:1; __u8 serial; int nDataChunks; __u32 fileSizeOrEquivalentObjectId; }yaffs_CheckpointObject; /*--------------------- 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 maxLine; } yaffs_TempBuffer; /*----------------- Device ---------------------------------*/ struct yaffs_DeviceStruct { struct list_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 */ int nChunksPerBlock; /* does not need to be a power of 2 */ int nBytesPerSpare; /* spare area size */ int startBlock; /* Start block we're allowed to use */ int endBlock; /* End block we're allowed to use */ int nReservedBlocks; /* We want this tuneable so that we can reduce */ /* 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) */ int useHeaderFileSize; /* Flag to determine if we should use file sizes from the header */ int useNANDECC; /* Flag to decide whether or not to use NANDECC */ void *genericDevice; /* Pointer to device context * On an mtd this holds the mtd pointer. */ void *superBlock; /* NAND access functions (Must be set before calling YAFFS)*/ int (*writeChunkToNAND) (struct yaffs_DeviceStruct * dev, int chunkInNAND, const __u8 * data, const yaffs_Spare * spare); int (*readChunkFromNAND) (struct yaffs_DeviceStruct * dev, int chunkInNAND, __u8 * data, yaffs_Spare * spare); int (*eraseBlockInNAND) (struct yaffs_DeviceStruct * dev, int blockInNAND); int (*initialiseNAND) (struct yaffs_DeviceStruct * dev); #ifdef CONFIG_YAFFS_YAFFS2 int (*writeChunkWithTagsToNAND) (struct yaffs_DeviceStruct * dev, int chunkInNAND, const __u8 * data, const yaffs_ExtendedTags * tags); int (*readChunkWithTagsFromNAND) (struct yaffs_DeviceStruct * dev, int chunkInNAND, __u8 * data, yaffs_ExtendedTags * tags); int (*markNANDBlockBad) (struct yaffs_DeviceStruct * dev, int blockNo); int (*queryNANDBlock) (struct yaffs_DeviceStruct * dev, int blockNo, yaffs_BlockState * state, int *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 */ void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj); /* Callback to mark the superblock dirsty */ void (*markSuperBlockDirty)(void * superblock); int wideTnodesDisabled; /* Set to disable wide tnodes */ /* End of stuff that must be set before initialisation. */ /* Checkpoint control. Can be set before or after initialisation */ __u8 skipCheckpointRead; __u8 skipCheckpointWrite; /* Runtime parameters. Set up by YAFFS. */ __u16 chunkGroupBits; /* 0 for devices <= 32MB. else log2(nchunks) - 16 */ __u16 chunkGroupSize; /* == 2^^chunkGroupBits */ /* Stuff to support wide tnodes */ __u32 tnodeWidth; __u32 tnodeMask; /* Stuff to support various file offses to chunk/offset translations */ /* "Crumbs" for nDataBytesPerChunk not being a power of 2 */ __u32 crumbMask; __u32 crumbShift; __u32 crumbsPerChunk; /* Straight shifting for nDataBytesPerChunk being a power of 2 */ __u32 chunkShift; __u32 chunkMask; #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 isCheckpointed; /* Stuff to support block offsetting to support start block zero */ int internalStartBlock; int internalEndBlock; int blockOffset; int chunkOffset; /* Runtime checkpointing stuff */ int checkpointPageSequence; /* running sequence number of checkpoint pages */ int checkpointByteCount; int checkpointByteOffset; __u8 *checkpointBuffer; int checkpointOpenForWrite; int blocksInCheckpoint; int checkpointCurrentChunk; int checkpointCurrentBlock; int checkpointNextBlock; int *checkpointBlockList; int checkpointMaxBlocks; __u32 checkpointSum; __u32 checkpointXor; /* Block Info */ yaffs_BlockInfo *blockInfo; __u8 *chunkBits; /* bitmap of chunks in use */ unsigned blockInfoAlt:1; /* was allocated using alternative strategy */ unsigned chunkBitsAlt:1; /* was allocated using alternative strategy */ int chunkBitmapStride; /* Number of bytes of chunkBits per block. * Must be consistent with nChunksPerBlock. */ int nErasedBlocks; int allocationBlock; /* Current block being allocated off */ __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 nObjectsCreated; yaffs_Object *freeObjects; int nFreeObjects; yaffs_ObjectList *allocatedObjectList; yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS]; int nFreeChunks; int currentDirtyChecker; /* Used to find current dirtiest block */ __u32 *gcCleanupList; /* objects to delete at the end of a GC. */ int nonAggressiveSkip; /* GC state/mode */ /* 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 */ /* Special directories */ yaffs_Object *rootDir; yaffs_Object *lostNFoundDir; /* Buffer areas for storing data to recover from write failures TODO * __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK]; * yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK]; */ int bufferedBlock; /* Which block is buffered here? */ int doingBufferedBlockRewrite; 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. */ yaffs_Object *unlinkedDeletion; /* Current file being background deleted.*/ int nDeletedFiles; /* Count of files awaiting deletion;*/ int nUnlinkedFiles; /* Count of unlinked files. */ int nBackgroundDeletions; /* Count of background deletions. */ yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS]; int maxTemp; int unmanagedTempAllocations; int unmanagedTempDeallocations; /* yaffs2 runtime stuff */ unsigned sequenceNumber; /* Sequence number of currently allocating block */ unsigned oldestDirtySequence; }; typedef struct yaffs_DeviceStruct yaffs_Device; /* The static layout of bllock usage etc is stored in the super block header */ typedef struct { int StructType; int version; int checkpointStartBlock; int checkpointEndBlock; int startBlock; int endBlock; int rfu[100]; } yaffs_SuperBlockHeader; /* The CheckpointDevice structure holds the device information that changes at runtime and * must be preserved over unmount/mount cycles. */ typedef struct { int structType; int nErasedBlocks; int allocationBlock; /* Current block being allocated off */ __u32 allocationPage; int nFreeChunks; int nDeletedFiles; /* Count of files awaiting deletion;*/ int nUnlinkedFiles; /* Count of unlinked files. */ int nBackgroundDeletions; /* Count of background deletions. */ /* yaffs2 runtime stuff */ unsigned sequenceNumber; /* Sequence number of currently allocating block */ unsigned oldestDirtySequence; } yaffs_CheckpointDevice; typedef struct { int structType; __u32 magic; __u32 version; __u32 head; } yaffs_CheckpointValidity; /* Function to manipulate block info */ static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk) { if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) { T(YAFFS_TRACE_ERROR, (TSTR ("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR), blk)); YBUG(); } return &dev->blockInfo[blk - dev->internalStartBlock]; } /*----------------------- YAFFS Functions -----------------------*/ int yaffs_GutsInitialise(yaffs_Device * dev); void yaffs_Deinitialise(yaffs_Device * dev); int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev); int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName, yaffs_Object * newDir, const YCHAR * newName); int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name); int yaffs_DeleteFile(yaffs_Object * obj); int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize); int yaffs_GetObjectFileLength(yaffs_Object * obj); int yaffs_GetObjectInode(yaffs_Object * obj); unsigned yaffs_GetObjectType(yaffs_Object * obj); int yaffs_GetObjectLinkCount(yaffs_Object * obj); int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr); int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr); /* File operations */ int yaffs_ReadDataFromFile(yaffs_Object * obj, __u8 * buffer, loff_t offset, int nBytes); int yaffs_WriteDataToFile(yaffs_Object * obj, const __u8 * buffer, loff_t offset, int nBytes, int writeThrough); int yaffs_ResizeFile(yaffs_Object * obj, loff_t newSize); yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name, __u32 mode, __u32 uid, __u32 gid); int yaffs_FlushFile(yaffs_Object * obj, int updateTime); /* Flushing and checkpointing */ void yaffs_FlushEntireDeviceCache(yaffs_Device *dev); int yaffs_CheckpointSave(yaffs_Device *dev); int yaffs_CheckpointRestore(yaffs_Device *dev); /* Directory operations */ yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name, __u32 mode, __u32 uid, __u32 gid); yaffs_Object *yaffs_FindObjectByName(yaffs_Object * theDir, const YCHAR * name); int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir, int (*fn) (yaffs_Object *)); yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number); /* Link operations */ yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name, yaffs_Object * equivalentObject); yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj); /* Symlink operations */ yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name, __u32 mode, __u32 uid, __u32 gid, const YCHAR * alias); YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj); /* Special inodes (fifos, sockets and devices) */ yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev); /* Special directories */ yaffs_Object *yaffs_Root(yaffs_Device * dev); yaffs_Object *yaffs_LostNFound(yaffs_Device * dev); #ifdef CONFIG_YAFFS_WINCE /* CONFIG_YAFFS_WINCE special stuff */ void yfsd_WinFileTimeNow(__u32 target[2]); #endif #ifdef __KERNEL__ void yaffs_HandleDeferedFree(yaffs_Object * obj); #endif /* Debug dump */ int yaffs_DumpObject(yaffs_Object * obj); void yaffs_GutsTest(yaffs_Device * dev); /* A few useful functions */ void yaffs_InitialiseTags(yaffs_ExtendedTags * tags); 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); #endif