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Diffstat (limited to 'target/linux/generic-2.6/files/fs/yaffs2/yaffs_guts.h')
| -rw-r--r-- | target/linux/generic-2.6/files/fs/yaffs2/yaffs_guts.h | 902 |
1 files changed, 0 insertions, 902 deletions
diff --git a/target/linux/generic-2.6/files/fs/yaffs2/yaffs_guts.h b/target/linux/generic-2.6/files/fs/yaffs2/yaffs_guts.h deleted file mode 100644 index ea06c1a38e..0000000000 --- a/target/linux/generic-2.6/files/fs/yaffs2/yaffs_guts.h +++ /dev/null @@ -1,902 +0,0 @@ -/* - * 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 |