X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_guts.h;h=b9b2ea19481f3237509b4ad8419cc8a45bf2cf4d;hp=6251f9a7eee61a8a4a5de202e366f843c6af6ea8;hb=701deef6f0f31c3adb564393487044bb0ea84da4;hpb=e721e0888655c325e5d5477ae121ff325f2847c0 diff --git a/yaffs_guts.h b/yaffs_guts.h index 6251f9a..b9b2ea1 100644 --- a/yaffs_guts.h +++ b/yaffs_guts.h @@ -1,5 +1,5 @@ /* - * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * 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 @@ -22,11 +22,11 @@ #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 a Y=0x59, + * Give us an A=0x41, + * Give us an FF=0xFF * Give us an S=0x53 - * And what have we got... + * And what have we got... */ #define YAFFS_MAGIC 0x5941FF53 @@ -90,7 +90,7 @@ #define YAFFS_MAX_SHORT_OP_CACHES 20 -#define YAFFS_N_TEMP_BUFFERS 4 +#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. @@ -102,7 +102,7 @@ * 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, + * 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 @@ -178,7 +178,7 @@ typedef struct { /* The following stuff only has meaning when we read */ yaffs_ECCResult eccResult; - unsigned blockBad; + unsigned blockBad; /* YAFFS 1 stuff */ unsigned chunkDeleted; /* The chunk is marked deleted */ @@ -244,29 +244,29 @@ typedef enum { /* This block is empty */ YAFFS_BLOCK_STATE_ALLOCATING, - /* This block is partially allocated. + /* 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, + YAFFS_BLOCK_STATE_FULL, /* All the pages in this block have been allocated. */ YAFFS_BLOCK_STATE_DIRTY, - /* All pages have been allocated and deleted. + /* All pages have been allocated and deleted. * Erase me, reuse me. */ - YAFFS_BLOCK_STATE_CHECKPOINT, + YAFFS_BLOCK_STATE_CHECKPOINT, /* This block is assigned to holding checkpoint data. */ - YAFFS_BLOCK_STATE_COLLECTING, + YAFFS_BLOCK_STATE_COLLECTING, /* This block is being garbage collected */ - YAFFS_BLOCK_STATE_DEAD + YAFFS_BLOCK_STATE_DEAD /* This block has failed and is not in use */ } yaffs_BlockState; @@ -281,7 +281,7 @@ typedef struct { __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. + __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 */ @@ -303,7 +303,7 @@ typedef struct { __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 */ + /* The following apply to directories, files, symlinks - not hard links */ __u32 yst_mode; /* protection */ #ifdef CONFIG_YAFFS_WINCE @@ -331,11 +331,14 @@ typedef struct { __u32 win_ctime[2]; __u32 win_atime[2]; __u32 win_mtime[2]; - __u32 roomToGrow[4]; #else - __u32 roomToGrow[10]; + __u32 roomToGrow[6]; + #endif + __u32 inbandShadowsObject; + __u32 inbandIsShrink; + __u32 reservedSpace[2]; int shadowsObject; /* This object header shadows the specified object if > 0 */ /* isShrink applies to object headers written when we shrink the file (ie resize) */ @@ -381,7 +384,7 @@ typedef struct { } yaffs_FileStructure; typedef struct { - struct list_head children; /* list of child links */ + struct ylist_head children; /* list of child links */ } yaffs_DirectoryStructure; typedef struct { @@ -408,7 +411,7 @@ struct yaffs_ObjectStruct { __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 + __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). */ @@ -424,17 +427,17 @@ struct yaffs_ObjectStruct { struct yaffs_DeviceStruct *myDev; /* The device I'm on */ - struct list_head hashLink; /* list of objects in this hash bucket */ + struct ylist_head hashLink; /* list of objects in this hash bucket */ - struct list_head hardLinks; /* all the equivalent hard linked objects */ + struct ylist_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; + struct yaffs_ObjectStruct *parent; + struct ylist_head siblings; /* Where's my object header in NAND? */ - int chunkId; + int chunkId; int nDataChunks; /* Number of data chunks attached to the file. */ @@ -485,31 +488,31 @@ struct yaffs_ObjectList_struct { typedef struct yaffs_ObjectList_struct yaffs_ObjectList; typedef struct { - struct list_head list; + struct ylist_head list; int count; } yaffs_ObjectBucket; -/* yaffs_CheckpointObject holds the definition of an object as dumped +/* yaffs_CheckpointObject holds the definition of an object as dumped * by checkpointing. */ typedef struct { int structType; - __u32 objectId; + __u32 objectId; __u32 parentId; int chunkId; - + yaffs_ObjectType variantType:3; - __u8 deleted:1; - __u8 softDeleted:1; - __u8 unlinked:1; - __u8 fake:1; + __u8 deleted:1; + __u8 softDeleted:1; + __u8 unlinked:1; + __u8 fake:1; __u8 renameAllowed:1; __u8 unlinkAllowed:1; - __u8 serial; - - int nDataChunks; + __u8 serial; + + int nDataChunks; __u32 fileSizeOrEquivalentObjectId; }yaffs_CheckpointObject; @@ -528,7 +531,7 @@ typedef struct { /*----------------- Device ---------------------------------*/ struct yaffs_DeviceStruct { - struct list_head devList; + struct ylist_head devList; const char *name; /* Entry parameters set up way early. Yaffs sets up the rest.*/ @@ -539,14 +542,14 @@ struct yaffs_DeviceStruct { 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 @@ -561,7 +564,7 @@ struct yaffs_DeviceStruct { * 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, @@ -583,25 +586,26 @@ struct yaffs_DeviceStruct { yaffs_ExtendedTags * tags); int (*markNANDBlockBad) (struct yaffs_DeviceStruct * dev, int blockNo); int (*queryNANDBlock) (struct yaffs_DeviceStruct * dev, int blockNo, - yaffs_BlockState * state, int *sequenceNumber); + yaffs_BlockState * state, __u32 *sequenceNumber); #endif int isYaffs2; - - /* The removeObjectCallback function must be supplied by OS flavours that + + /* 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 */ + YCHAR *pathDividers; /* String of legal path dividers */ /* End of stuff that must be set before initialisation. */ - + /* Checkpoint control. Can be set before or after initialisation */ __u8 skipCheckpointRead; __u8 skipCheckpointWrite; @@ -610,34 +614,32 @@ struct yaffs_DeviceStruct { __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; - + + /* Stuff for figuring out file offset to chunk conversions */ + __u32 chunkShift; /* Shift value */ + __u32 chunkDiv; /* Divisor after shifting: 1 for power-of-2 sizes */ + __u32 chunkMask; /* Mask to use for power-of-2 case */ + + /* Stuff to handle inband tags */ + int inbandTags; + __u32 totalBytesPerChunk; #ifdef __KERNEL__ struct semaphore sem; /* Semaphore for waiting on erasure.*/ struct semaphore grossLock; /* Gross locking semaphore */ - __u8 *spareBuffer; /* For mtdif2 use. Don't know the size of the buffer + __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; @@ -646,7 +648,7 @@ struct yaffs_DeviceStruct { int internalEndBlock; int blockOffset; int chunkOffset; - + /* Runtime checkpointing stuff */ int checkpointPageSequence; /* running sequence number of checkpoint pages */ @@ -662,15 +664,15 @@ struct yaffs_DeviceStruct { int checkpointMaxBlocks; __u32 checkpointSum; __u32 checkpointXor; - + int nCheckpointBlocksRequired; /* Number of blocks needed to store current checkpoint set */ - + /* 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. + int chunkBitmapStride; /* Number of bytes of chunkBits per block. * Must be consistent with nChunksPerBlock. */ @@ -718,7 +720,7 @@ struct yaffs_DeviceStruct { int tagsEccUnfixed; int nDeletions; int nUnmarkedDeletions; - + int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */ /* Special directories */ @@ -729,7 +731,7 @@ struct yaffs_DeviceStruct { * __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; @@ -746,9 +748,11 @@ struct yaffs_DeviceStruct { int nUnlinkedFiles; /* Count of unlinked files. */ int nBackgroundDeletions; /* Count of background deletions. */ - + + /* Temporary buffer management */ yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS]; int maxTemp; + int tempInUse; int unmanagedTempAllocations; int unmanagedTempDeallocations; @@ -760,7 +764,7 @@ struct yaffs_DeviceStruct { typedef struct yaffs_DeviceStruct yaffs_Device; -/* The static layout of bllock usage etc is stored in the super block header */ +/* The static layout of block usage etc is stored in the super block header */ typedef struct { int StructType; int version; @@ -770,7 +774,7 @@ typedef struct { 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. */ @@ -799,18 +803,6 @@ typedef struct { __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 -----------------------*/ @@ -901,4 +893,7 @@ 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); +__u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo); +void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer, int lineNo); + #endif