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openwrt/target/linux/generic/files/fs/yaffs2/yaffs_guts.h
Felix Fietkau da1bb88a2b rename target/linux/generic-2.6 to generic 
SVN-Revision: 21952
2010-06-26 20:42:58 +00:00

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/*
* 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
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