X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_guts.c;h=6ea5698b5052dd375e15bceba736a183209587cc;hp=604dc0910af9301d9b70d2feb304a9d9b1559b12;hb=de6470acd795b2daab5372dd4a9edce3f186afea;hpb=299791ad6d378fae30d50560097a7633cde3aab2 diff --git a/yaffs_guts.c b/yaffs_guts.c index 604dc09..6ea5698 100644 --- a/yaffs_guts.c +++ b/yaffs_guts.c @@ -19,12 +19,13 @@ #include "yaffs_getblockinfo.h" #include "yaffs_tagscompat.h" -#ifndef CONFIG_YAFFS_USE_OWN_SORT -#include "yaffs_qsort.h" -#endif + #include "yaffs_nand.h" -#include "yaffs_checkptrw.h" +#include "yaffs_yaffs1.h" +#include "yaffs_yaffs2.h" +#include "yaffs_bitmap.h" +#include "yaffs_verify.h" #include "yaffs_nand.h" #include "yaffs_packedtags2.h" @@ -36,27 +37,9 @@ #define YAFFS_GC_GOOD_ENOUGH 2 #define YAFFS_GC_PASSIVE_THRESHOLD 4 -#define YAFFS_SMALL_HOLE_THRESHOLD 3 - -/* - * Checkpoints are really no benefit on very small partitions. - * - * To save space on small partitions don't bother with checkpoints unless - * the partition is at least this big. - */ -#define YAFFS_CHECKPOINT_MIN_BLOCKS 60 - #include "yaffs_ecc.h" -/* Private structure for doing xattr modifications */ -typedef struct { - int set; /* If 0 then this is a deletion */ - const char *name; - const void *data; - int size; - int flags; - int result; -} yaffs_XAttrMod; + /* Robustification (if it ever comes about...) */ static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND); @@ -73,22 +56,17 @@ static void yaffs_UpdateParent(yaffs_Object *obj); static int yaffs_UnlinkObject(yaffs_Object *obj); static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj); -static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList); - static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve); -static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode, - int chunkInNAND, int inScan); + static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number, yaffs_ObjectType type); -static void yaffs_AddObjectToDirectory(yaffs_Object *directory, - yaffs_Object *obj); -static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, - int force, int isShrink, int shadows, yaffs_XAttrMod *xop); -static int yaffs_ApplyXMod(yaffs_Device *dev, char *buffer, yaffs_XAttrMod *xmod); + + +static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod); static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj); static int yaffs_CheckStructures(void); @@ -108,38 +86,24 @@ static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve, yaffs_BlockInfo **blockUsedPtr); -static void yaffs_VerifyFreeChunks(yaffs_Device *dev); - static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in); -static void yaffs_VerifyDirectory(yaffs_Object *directory); -#ifdef YAFFS_PARANOID -static int yaffs_CheckFileSanity(yaffs_Object *in); -#else -#define yaffs_CheckFileSanity(in) -#endif - static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in); static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId); -static void yaffs_InvalidateCheckpoint(yaffs_Device *dev); - static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode, yaffs_ExtendedTags *tags); -static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, - unsigned pos); -static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev, - yaffs_FileStructure *fStruct, - __u32 chunkId); - -static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize); -static void yaffs_SkipRestOfBlock(yaffs_Device *dev); static int yaffs_VerifyChunkWritten(yaffs_Device *dev, int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags); + +static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize); +static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev,YCHAR *ohName, const YCHAR *name); + + /* Function to calculate chunk and offset */ static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut, @@ -326,6721 +290,4120 @@ int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer) return 0; } +/* + * Verification code + */ + + /* - * Chunk bitmap manipulations + * Simple hash function. Needs to have a reasonable spread */ -static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk) +static Y_INLINE int yaffs_HashFunction(int n) { - if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) { - T(YAFFS_TRACE_ERROR, - (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR), - blk)); - YBUG(); - } - return dev->chunkBits + - (dev->chunkBitmapStride * (blk - dev->internalStartBlock)); + n = abs(n); + return n % YAFFS_NOBJECT_BUCKETS; } -static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk) -{ - if (blk < dev->internalStartBlock || blk > dev->internalEndBlock || - chunk < 0 || chunk >= dev->param.nChunksPerBlock) { - T(YAFFS_TRACE_ERROR, - (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR), - blk, chunk)); - YBUG(); - } -} +/* + * Access functions to useful fake objects. + * Note that root might have a presence in NAND if permissions are set. + */ -static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk) +yaffs_Object *yaffs_Root(yaffs_Device *dev) { - __u8 *blkBits = yaffs_BlockBits(dev, blk); - - memset(blkBits, 0, dev->chunkBitmapStride); + return dev->rootDir; } -static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk) +yaffs_Object *yaffs_LostNFound(yaffs_Device *dev) { - __u8 *blkBits = yaffs_BlockBits(dev, blk); - - yaffs_VerifyChunkBitId(dev, blk, chunk); - - blkBits[chunk / 8] &= ~(1 << (chunk & 7)); + return dev->lostNFoundDir; } -static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk) -{ - __u8 *blkBits = yaffs_BlockBits(dev, blk); - yaffs_VerifyChunkBitId(dev, blk, chunk); +/* + * Erased NAND checking functions + */ - blkBits[chunk / 8] |= (1 << (chunk & 7)); +int yaffs_CheckFF(__u8 *buffer, int nBytes) +{ + /* Horrible, slow implementation */ + while (nBytes--) { + if (*buffer != 0xFF) + return 0; + buffer++; + } + return 1; } -static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk) +static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev, + int chunkInNAND) { - __u8 *blkBits = yaffs_BlockBits(dev, blk); - yaffs_VerifyChunkBitId(dev, blk, chunk); + int retval = YAFFS_OK; + __u8 *data = yaffs_GetTempBuffer(dev, __LINE__); + yaffs_ExtendedTags tags; + int result; - return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0; -} + result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags); -static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk) -{ - __u8 *blkBits = yaffs_BlockBits(dev, blk); - int i; - for (i = 0; i < dev->chunkBitmapStride; i++) { - if (*blkBits) - return 1; - blkBits++; + if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR) + retval = YAFFS_FAIL; + + if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) { + T(YAFFS_TRACE_NANDACCESS, + (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND)); + retval = YAFFS_FAIL; } - return 0; -} -static int yaffs_CountChunkBits(yaffs_Device *dev, int blk) -{ - __u8 *blkBits = yaffs_BlockBits(dev, blk); - int i; - int n = 0; - for (i = 0; i < dev->chunkBitmapStride; i++) { - __u8 x = *blkBits; - while (x) { - if (x & 1) - n++; - x >>= 1; - } + yaffs_ReleaseTempBuffer(dev, data, __LINE__); + + return retval; - blkBits++; - } - return n; } -/* - * Verification code - */ -static int yaffs_SkipVerification(yaffs_Device *dev) +static int yaffs_VerifyChunkWritten(yaffs_Device *dev, + int chunkInNAND, + const __u8 *data, + yaffs_ExtendedTags *tags) { - dev=dev; - return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL)); -} + int retval = YAFFS_OK; + yaffs_ExtendedTags tempTags; + __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__); + int result; + + result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags); + if(memcmp(buffer,data,dev->nDataBytesPerChunk) || + tempTags.objectId != tags->objectId || + tempTags.chunkId != tags->chunkId || + tempTags.byteCount != tags->byteCount) + retval = YAFFS_FAIL; -static int yaffs_SkipFullVerification(yaffs_Device *dev) -{ - dev=dev; - return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL)); + yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); + + return retval; } -static int yaffs_SkipNANDVerification(yaffs_Device *dev) +static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev, + const __u8 *data, + yaffs_ExtendedTags *tags, + int useReserve) { - dev=dev; - return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND)); -} + int attempts = 0; + int writeOk = 0; + int chunk; -static const char *blockStateName[] = { -"Unknown", -"Needs scanning", -"Scanning", -"Empty", -"Allocating", -"Full", -"Dirty", -"Checkpoint", -"Collecting", -"Dead" -}; + yaffs2_InvalidateCheckpoint(dev); -static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n) -{ - int actuallyUsed; - int inUse; + do { + yaffs_BlockInfo *bi = 0; + int erasedOk = 0; - if (yaffs_SkipVerification(dev)) - return; + chunk = yaffs_AllocateChunk(dev, useReserve, &bi); + if (chunk < 0) { + /* no space */ + break; + } - /* Report illegal runtime states */ - if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES) - T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState)); + /* First check this chunk is erased, if it needs + * checking. The checking policy (unless forced + * always on) is as follows: + * + * Check the first page we try to write in a block. + * If the check passes then we don't need to check any + * more. If the check fails, we check again... + * If the block has been erased, we don't need to check. + * + * However, if the block has been prioritised for gc, + * then we think there might be something odd about + * this block and stop using it. + * + * Rationale: We should only ever see chunks that have + * not been erased if there was a partially written + * chunk due to power loss. This checking policy should + * catch that case with very few checks and thus save a + * lot of checks that are most likely not needed. + * + * Mods to the above + * If an erase check fails or the write fails we skip the + * rest of the block. + */ - switch (bi->blockState) { - case YAFFS_BLOCK_STATE_UNKNOWN: - case YAFFS_BLOCK_STATE_SCANNING: - case YAFFS_BLOCK_STATE_NEEDS_SCANNING: - T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR), - n, blockStateName[bi->blockState])); - } + /* let's give it a try */ + attempts++; - /* Check pages in use and soft deletions are legal */ +#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED + bi->skipErasedCheck = 0; +#endif + if (!bi->skipErasedCheck) { + erasedOk = yaffs_CheckChunkErased(dev, chunk); + if (erasedOk != YAFFS_OK) { + T(YAFFS_TRACE_ERROR, + (TSTR("**>> yaffs chunk %d was not erased" + TENDSTR), chunk)); - actuallyUsed = bi->pagesInUse - bi->softDeletions; + /* If not erased, delete this one, + * skip rest of block and + * try another chunk */ + yaffs_DeleteChunk(dev,chunk,1,__LINE__); + yaffs_SkipRestOfBlock(dev); + continue; + } + } - if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock || - bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock || - actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock) - T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR), - n, bi->pagesInUse, bi->softDeletions)); + writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk, + data, tags); + if(!bi->skipErasedCheck) + writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags); - /* Check chunk bitmap legal */ - inUse = yaffs_CountChunkBits(dev, n); - if (inUse != bi->pagesInUse) - T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR), - n, bi->pagesInUse, inUse)); + if (writeOk != YAFFS_OK) { + /* Clean up aborted write, skip to next block and + * try another chunk */ + yaffs_HandleWriteChunkError(dev, chunk, erasedOk); + continue; + } - /* Check that the sequence number is valid. - * Ten million is legal, but is very unlikely - */ - if (dev->param.isYaffs2 && - (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) && - (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000)) - T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR), - n, bi->sequenceNumber)); -} + bi->skipErasedCheck = 1; -static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, - int n) -{ - yaffs_VerifyBlock(dev, bi, n); + /* Copy the data into the robustification buffer */ + yaffs_HandleWriteChunkOk(dev, chunk, data, tags); - /* After collection the block should be in the erased state */ - /* This will need to change if we do partial gc */ + } while (writeOk != YAFFS_OK && + (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts)); - if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && - bi->blockState != YAFFS_BLOCK_STATE_EMPTY) { - T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR), - n, bi->blockState)); - } -} + if (!writeOk) + chunk = -1; -static void yaffs_VerifyBlocks(yaffs_Device *dev) -{ - int i; - int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES]; - int nIllegalBlockStates = 0; + if (attempts > 1) { + T(YAFFS_TRACE_ERROR, + (TSTR("**>> yaffs write required %d attempts" TENDSTR), + attempts)); - if (yaffs_SkipVerification(dev)) - return; + dev->nRetriedWrites += (attempts - 1); + } - memset(nBlocksPerState, 0, sizeof(nBlocksPerState)); + return chunk; +} - for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) { - yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i); - yaffs_VerifyBlock(dev, bi, i); - if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES) - nBlocksPerState[bi->blockState]++; - else - nIllegalBlockStates++; - } + +/* + * Block retiring for handling a broken block. + */ - T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR))); - T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR))); +static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND) +{ + yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND); - T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates)); - if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1) - T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR))); + yaffs2_InvalidateCheckpoint(dev); + + yaffs2_ClearOldestDirtySequence(dev,bi); - for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++) - T(YAFFS_TRACE_VERIFY, - (TSTR("%s %d blocks"TENDSTR), - blockStateName[i], nBlocksPerState[i])); + if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) { + if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) { + T(YAFFS_TRACE_ALWAYS, (TSTR( + "yaffs: Failed to mark bad and erase block %d" + TENDSTR), blockInNAND)); + } else { + yaffs_ExtendedTags tags; + int chunkId = blockInNAND * dev->param.nChunksPerBlock; - if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]) - T(YAFFS_TRACE_VERIFY, - (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR), - dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])); + __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__); - if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]) - T(YAFFS_TRACE_VERIFY, - (TSTR("Erased block count wrong dev %d count %d"TENDSTR), - dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])); + memset(buffer, 0xff, dev->nDataBytesPerChunk); + yaffs_InitialiseTags(&tags); + tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK; + if (dev->param.writeChunkWithTagsToNAND(dev, chunkId - + dev->chunkOffset, buffer, &tags) != YAFFS_OK) + T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to " + TCONT("write bad block marker to block %d") + TENDSTR), blockInNAND)); - if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1) - T(YAFFS_TRACE_VERIFY, - (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR), - nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING])); + yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); + } + } - T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR))); + bi->blockState = YAFFS_BLOCK_STATE_DEAD; + bi->gcPrioritise = 0; + bi->needsRetiring = 0; + dev->nRetiredBlocks++; } /* - * Verify the object header. oh must be valid, but obj and tags may be NULL in which - * case those tests will not be performed. + * Functions for robustisizing TODO + * */ -static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck) -{ - if (obj && yaffs_SkipVerification(obj->myDev)) - return; - if (!(tags && obj && oh)) { - T(YAFFS_TRACE_VERIFY, - (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR), - tags, obj, oh)); - return; - } +static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND, + const __u8 *data, + const yaffs_ExtendedTags *tags) +{ + dev=dev; + chunkInNAND=chunkInNAND; + data=data; + tags=tags; +} - if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN || - oh->type > YAFFS_OBJECT_TYPE_MAX) - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR), - tags->objectId, oh->type)); +static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND, + const yaffs_ExtendedTags *tags) +{ + dev=dev; + chunkInNAND=chunkInNAND; + tags=tags; +} - if (tags->objectId != obj->objectId) - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d header mismatch objectId %d"TENDSTR), - tags->objectId, obj->objectId)); +void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi) +{ + if (!bi->gcPrioritise) { + bi->gcPrioritise = 1; + dev->hasPendingPrioritisedGCs = 1; + bi->chunkErrorStrikes++; + if (bi->chunkErrorStrikes > 3) { + bi->needsRetiring = 1; /* Too many stikes, so retire this */ + T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR))); - /* - * Check that the object's parent ids match if parentCheck requested. - * - * Tests do not apply to the root object. - */ + } + } +} - if (parentCheck && tags->objectId > 1 && !obj->parent) - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR), - tags->objectId, oh->parentObjectId)); +static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND, + int erasedOk) +{ + int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock; + yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND); - if (parentCheck && obj->parent && - oh->parentObjectId != obj->parent->objectId && - (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED || - obj->parent->objectId != YAFFS_OBJECTID_DELETED)) - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR), - tags->objectId, oh->parentObjectId, obj->parent->objectId)); + yaffs_HandleChunkError(dev, bi); - if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */ - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d header name is NULL"TENDSTR), - obj->objectId)); + if (erasedOk) { + /* Was an actual write failure, so mark the block for retirement */ + bi->needsRetiring = 1; + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND)); + } - if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */ - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d header name is 0xFF"TENDSTR), - obj->objectId)); + /* Delete the chunk */ + yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__); + yaffs_SkipRestOfBlock(dev); } -#if 0 -/* Not being used, but don't want to throw away yet */ -static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn, - __u32 level, int chunkOffset) -{ - int i; - yaffs_Device *dev = obj->myDev; - int ok = 1; - - if (tn) { - if (level > 0) { - - for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) { - if (tn->internal[i]) { - ok = yaffs_VerifyTnodeWorker(obj, - tn->internal[i], - level - 1, - (chunkOffset<objectId; +/*---------------- Name handling functions ------------*/ - chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS; +static __u16 yaffs_CalcNameSum(const YCHAR *name) +{ + __u16 sum = 0; + __u16 i = 1; - for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) { - __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i); + const YUCHAR *bname = (const YUCHAR *) name; + if (bname) { + while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) { - if (theChunk > 0) { - /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */ - yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags); - if (tags.objectId != objectId || tags.chunkId != chunkOffset) { - T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR), - objectId, chunkOffset, theChunk, - tags.objectId, tags.chunkId)); - } - } - chunkOffset++; - } +#ifdef CONFIG_YAFFS_CASE_INSENSITIVE + sum += yaffs_toupper(*bname) * i; +#else + sum += (*bname) * i; +#endif + i++; + bname++; } } - - return ok; - + return sum; } +void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name) +{ +#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM + memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1)); + if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH) + yaffs_strcpy(obj->shortName, name); + else + obj->shortName[0] = _Y('\0'); #endif + obj->sum = yaffs_CalcNameSum(name); +} -static void yaffs_VerifyFile(yaffs_Object *obj) +void yaffs_SetObjectNameFromOH(yaffs_Object *obj, const yaffs_ObjectHeader *oh) { - int requiredTallness; - int actualTallness; - __u32 lastChunk; - __u32 x; - __u32 i; - yaffs_Device *dev; - yaffs_ExtendedTags tags; - yaffs_Tnode *tn; - __u32 objectId; +#ifdef CONFIG_YAFFS_AUTO_UNICODE + YCHAR tmpName[YAFFS_MAX_NAME_LENGTH+1]; + memset(tmpName,0,sizeof(tmpName)); + yaffs_LoadNameFromObjectHeader(obj->myDev,tmpName,oh->name,YAFFS_MAX_NAME_LENGTH+1); + yaffs_SetObjectName(obj,tmpName); +#else + yaffs_SetObjectName(obj,oh->name); +#endif +} - if (!obj) - return; +/*-------------------- TNODES ------------------- - if (yaffs_SkipVerification(obj->myDev)) - return; + * List of spare tnodes + * The list is hooked together using the first pointer + * in the tnode. + */ - dev = obj->myDev; - objectId = obj->objectId; - /* Check file size is consistent with tnode depth */ - lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1; - x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS; - requiredTallness = 0; - while (x > 0) { - x >>= YAFFS_TNODES_INTERNAL_BITS; - requiredTallness++; +yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev) +{ + yaffs_Tnode *tn = yaffs_AllocateRawTnode(dev); + if (tn){ + memset(tn, 0, dev->tnodeSize); + dev->nTnodes++; } - actualTallness = obj->variant.fileVariant.topLevel; - - /* Check that the chunks in the tnode tree are all correct. - * We do this by scanning through the tnode tree and - * checking the tags for every chunk match. - */ - - if (yaffs_SkipNANDVerification(dev)) - return; + dev->nCheckpointBlocksRequired = 0; /* force recalculation*/ - for (i = 1; i <= lastChunk; i++) { - tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i); - - if (tn) { - __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i); - if (theChunk > 0) { - /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */ - yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags); - if (tags.objectId != objectId || tags.chunkId != i) { - T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR), - objectId, i, theChunk, - tags.objectId, tags.chunkId)); - } - } - } - } + return tn; } - -static void yaffs_VerifyHardLink(yaffs_Object *obj) +/* FreeTnode frees up a tnode and puts it back on the free list */ +static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn) { - if (obj && yaffs_SkipVerification(obj->myDev)) - return; - - /* Verify sane equivalent object */ + yaffs_FreeRawTnode(dev,tn); + dev->nTnodes--; + dev->nCheckpointBlocksRequired = 0; /* force recalculation*/ } -static void yaffs_VerifySymlink(yaffs_Object *obj) +static void yaffs_DeinitialiseTnodesAndObjects(yaffs_Device *dev) { - if (obj && yaffs_SkipVerification(obj->myDev)) - return; - - /* Verify symlink string */ + yaffs_DeinitialiseRawTnodesAndObjects(dev); + dev->nObjects = 0; + dev->nTnodes = 0; } -static void yaffs_VerifySpecial(yaffs_Object *obj) -{ - if (obj && yaffs_SkipVerification(obj->myDev)) - return; -} -static void yaffs_VerifyObject(yaffs_Object *obj) +void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, + unsigned val) { - yaffs_Device *dev; + __u32 *map = (__u32 *)tn; + __u32 bitInMap; + __u32 bitInWord; + __u32 wordInMap; + __u32 mask; - __u32 chunkMin; - __u32 chunkMax; + pos &= YAFFS_TNODES_LEVEL0_MASK; + val >>= dev->chunkGroupBits; - __u32 chunkIdOk; - __u32 chunkInRange; - __u32 chunkShouldNotBeDeleted; - __u32 chunkValid; + bitInMap = pos * dev->tnodeWidth; + wordInMap = bitInMap / 32; + bitInWord = bitInMap & (32 - 1); - if (!obj) - return; + mask = dev->tnodeMask << bitInWord; - if (obj->beingCreated) - return; + map[wordInMap] &= ~mask; + map[wordInMap] |= (mask & (val << bitInWord)); - dev = obj->myDev; + if (dev->tnodeWidth > (32 - bitInWord)) { + bitInWord = (32 - bitInWord); + wordInMap++;; + mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord); + map[wordInMap] &= ~mask; + map[wordInMap] |= (mask & (val >> bitInWord)); + } +} - if (yaffs_SkipVerification(dev)) - return; +__u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, + unsigned pos) +{ + __u32 *map = (__u32 *)tn; + __u32 bitInMap; + __u32 bitInWord; + __u32 wordInMap; + __u32 val; - /* Check sane object header chunk */ + pos &= YAFFS_TNODES_LEVEL0_MASK; - chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock; - chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1; + bitInMap = pos * dev->tnodeWidth; + wordInMap = bitInMap / 32; + bitInWord = bitInMap & (32 - 1); - chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax); - chunkIdOk = chunkInRange || (obj->hdrChunk == 0); - chunkValid = chunkInRange && - yaffs_CheckChunkBit(dev, - obj->hdrChunk / dev->param.nChunksPerBlock, - obj->hdrChunk % dev->param.nChunksPerBlock); - chunkShouldNotBeDeleted = chunkInRange && !chunkValid; + val = map[wordInMap] >> bitInWord; - if (!obj->fake && - (!chunkIdOk || chunkShouldNotBeDeleted)) { - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d has chunkId %d %s %s"TENDSTR), - obj->objectId, obj->hdrChunk, - chunkIdOk ? "" : ",out of range", - chunkShouldNotBeDeleted ? ",marked as deleted" : "")); + if (dev->tnodeWidth > (32 - bitInWord)) { + bitInWord = (32 - bitInWord); + wordInMap++;; + val |= (map[wordInMap] << bitInWord); } - if (chunkValid && !yaffs_SkipNANDVerification(dev)) { - yaffs_ExtendedTags tags; - yaffs_ObjectHeader *oh; - __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__); + val &= dev->tnodeMask; + val <<= dev->chunkGroupBits; - oh = (yaffs_ObjectHeader *)buffer; + return val; +} - yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer, - &tags); +/* ------------------- End of individual tnode manipulation -----------------*/ - yaffs_VerifyObjectHeader(obj, oh, &tags, 1); +/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------ + * The look up tree is represented by the top tnode and the number of topLevel + * in the tree. 0 means only the level 0 tnode is in the tree. + */ - yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); - } +/* FindLevel0Tnode finds the level 0 tnode, if one exists. */ +yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev, + yaffs_FileStructure *fStruct, + __u32 chunkId) +{ + yaffs_Tnode *tn = fStruct->top; + __u32 i; + int requiredTallness; + int level = fStruct->topLevel; - /* Verify it has a parent */ - if (obj && !obj->fake && - (!obj->parent || obj->parent->myDev != dev)) { - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR), - obj->objectId, obj->parent)); - } + dev=dev; - /* Verify parent is a directory */ - if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR), - obj->objectId, obj->parent->variantType)); - } + /* Check sane level and chunk Id */ + if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) + return NULL; - switch (obj->variantType) { - case YAFFS_OBJECT_TYPE_FILE: - yaffs_VerifyFile(obj); - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - yaffs_VerifySymlink(obj); - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - yaffs_VerifyDirectory(obj); - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - yaffs_VerifyHardLink(obj); - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - yaffs_VerifySpecial(obj); - break; - case YAFFS_OBJECT_TYPE_UNKNOWN: - default: - T(YAFFS_TRACE_VERIFY, - (TSTR("Obj %d has illegaltype %d"TENDSTR), - obj->objectId, obj->variantType)); - break; - } -} + if (chunkId > YAFFS_MAX_CHUNK_ID) + return NULL; -static void yaffs_VerifyObjects(yaffs_Device *dev) -{ - yaffs_Object *obj; - int i; - struct ylist_head *lh; + /* First check we're tall enough (ie enough topLevel) */ - if (yaffs_SkipVerification(dev)) - return; + i = chunkId >> YAFFS_TNODES_LEVEL0_BITS; + requiredTallness = 0; + while (i) { + i >>= YAFFS_TNODES_INTERNAL_BITS; + requiredTallness++; + } - /* Iterate through the objects in each hash entry */ + if (requiredTallness > fStruct->topLevel) + return NULL; /* Not tall enough, so we can't find it */ - for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { - ylist_for_each(lh, &dev->objectBucket[i].list) { - if (lh) { - obj = ylist_entry(lh, yaffs_Object, hashLink); - yaffs_VerifyObject(obj); - } - } + /* Traverse down to level 0 */ + while (level > 0 && tn) { + tn = tn->internal[(chunkId >> + (YAFFS_TNODES_LEVEL0_BITS + + (level - 1) * + YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK]; + level--; } -} + return tn; +} -/* - * Simple hash function. Needs to have a reasonable spread +/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree. + * This happens in two steps: + * 1. If the tree isn't tall enough, then make it taller. + * 2. Scan down the tree towards the level 0 tnode adding tnodes if required. + * + * Used when modifying the tree. + * + * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will + * be plugged into the ttree. */ -static Y_INLINE int yaffs_HashFunction(int n) +yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, + yaffs_FileStructure *fStruct, + __u32 chunkId, + yaffs_Tnode *passedTn) { - n = abs(n); - return n % YAFFS_NOBJECT_BUCKETS; -} + int requiredTallness; + int i; + int l; + yaffs_Tnode *tn; -/* - * Access functions to useful fake objects. - * Note that root might have a presence in NAND if permissions are set. - */ + __u32 x; -yaffs_Object *yaffs_Root(yaffs_Device *dev) -{ - return dev->rootDir; -} -yaffs_Object *yaffs_LostNFound(yaffs_Device *dev) -{ - return dev->lostNFoundDir; -} + /* Check sane level and page Id */ + if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) + return NULL; + if (chunkId > YAFFS_MAX_CHUNK_ID) + return NULL; -/* - * Erased NAND checking functions - */ + /* First check we're tall enough (ie enough topLevel) */ -int yaffs_CheckFF(__u8 *buffer, int nBytes) -{ - /* Horrible, slow implementation */ - while (nBytes--) { - if (*buffer != 0xFF) - return 0; - buffer++; + x = chunkId >> YAFFS_TNODES_LEVEL0_BITS; + requiredTallness = 0; + while (x) { + x >>= YAFFS_TNODES_INTERNAL_BITS; + requiredTallness++; } - return 1; -} -static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev, - int chunkInNAND) -{ - int retval = YAFFS_OK; - __u8 *data = yaffs_GetTempBuffer(dev, __LINE__); - yaffs_ExtendedTags tags; - int result; - result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags); + if (requiredTallness > fStruct->topLevel) { + /* Not tall enough, gotta make the tree taller */ + for (i = fStruct->topLevel; i < requiredTallness; i++) { - if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR) - retval = YAFFS_FAIL; + tn = yaffs_GetTnode(dev); - if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) { - T(YAFFS_TRACE_NANDACCESS, - (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND)); - retval = YAFFS_FAIL; + if (tn) { + tn->internal[0] = fStruct->top; + fStruct->top = tn; + fStruct->topLevel++; + } else { + T(YAFFS_TRACE_ERROR, + (TSTR("yaffs: no more tnodes" TENDSTR))); + return NULL; + } + } } - yaffs_ReleaseTempBuffer(dev, data, __LINE__); + /* Traverse down to level 0, adding anything we need */ - return retval; + l = fStruct->topLevel; + tn = fStruct->top; -} + if (l > 0) { + while (l > 0 && tn) { + x = (chunkId >> + (YAFFS_TNODES_LEVEL0_BITS + + (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK; -static int yaffs_VerifyChunkWritten(yaffs_Device *dev, - int chunkInNAND, - const __u8 *data, - yaffs_ExtendedTags *tags) -{ - int retval = YAFFS_OK; - yaffs_ExtendedTags tempTags; - __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__); - int result; - - result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags); - if(memcmp(buffer,data,dev->nDataBytesPerChunk) || - tempTags.objectId != tags->objectId || - tempTags.chunkId != tags->chunkId || - tempTags.byteCount != tags->byteCount) - retval = YAFFS_FAIL; + if ((l > 1) && !tn->internal[x]) { + /* Add missing non-level-zero tnode */ + tn->internal[x] = yaffs_GetTnode(dev); + if(!tn->internal[x]) + return NULL; + } else if (l == 1) { + /* Looking from level 1 at level 0 */ + if (passedTn) { + /* If we already have one, then release it.*/ + if (tn->internal[x]) + yaffs_FreeTnode(dev, tn->internal[x]); + tn->internal[x] = passedTn; - yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); + } else if (!tn->internal[x]) { + /* Don't have one, none passed in */ + tn->internal[x] = yaffs_GetTnode(dev); + if(!tn->internal[x]) + return NULL; + } + } - return retval; + tn = tn->internal[x]; + l--; + } + } else { + /* top is level 0 */ + if (passedTn) { + memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8); + yaffs_FreeTnode(dev, passedTn); + } + } + + return tn; } -static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev, - const __u8 *data, - yaffs_ExtendedTags *tags, - int useReserve) +static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk, + yaffs_ExtendedTags *tags, int objectId, + int chunkInInode) { - int attempts = 0; - int writeOk = 0; - int chunk; - - yaffs_InvalidateCheckpoint(dev); - - do { - yaffs_BlockInfo *bi = 0; - int erasedOk = 0; + int j; - chunk = yaffs_AllocateChunk(dev, useReserve, &bi); - if (chunk < 0) { - /* no space */ - break; + for (j = 0; theChunk && j < dev->chunkGroupSize; j++) { + if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock, + theChunk % dev->param.nChunksPerBlock)) { + + if(dev->chunkGroupSize == 1) + return theChunk; + else { + yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, + tags); + if (yaffs_TagsMatch(tags, objectId, chunkInInode)) { + /* found it; */ + return theChunk; + } + } } + theChunk++; + } + return -1; +} - /* First check this chunk is erased, if it needs - * checking. The checking policy (unless forced - * always on) is as follows: - * - * Check the first page we try to write in a block. - * If the check passes then we don't need to check any - * more. If the check fails, we check again... - * If the block has been erased, we don't need to check. - * - * However, if the block has been prioritised for gc, - * then we think there might be something odd about - * this block and stop using it. - * - * Rationale: We should only ever see chunks that have - * not been erased if there was a partially written - * chunk due to power loss. This checking policy should - * catch that case with very few checks and thus save a - * lot of checks that are most likely not needed. - * - * Mods to the above - * If an erase check fails or the write fails we skip the - * rest of the block. - */ +#if 0 +/* Experimental code not being used yet. Might speed up file deletion */ +/* DeleteWorker scans backwards through the tnode tree and deletes all the + * chunks and tnodes in the file. + * Returns 1 if the tree was deleted. + * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete. + */ - /* let's give it a try */ - attempts++; +static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, + int chunkOffset, int *limit) +{ + int i; + int chunkInInode; + int theChunk; + yaffs_ExtendedTags tags; + int foundChunk; + yaffs_Device *dev = in->myDev; -#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED - bi->skipErasedCheck = 0; -#endif - if (!bi->skipErasedCheck) { - erasedOk = yaffs_CheckChunkErased(dev, chunk); - if (erasedOk != YAFFS_OK) { - T(YAFFS_TRACE_ERROR, - (TSTR("**>> yaffs chunk %d was not erased" - TENDSTR), chunk)); + int allDone = 1; - /* If not erased, delete this one, - * skip rest of block and - * try another chunk */ - yaffs_DeleteChunk(dev,chunk,1,__LINE__); - yaffs_SkipRestOfBlock(dev); - continue; - } - } - - writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk, - data, tags); - - if(!bi->skipErasedCheck) - writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags); - - if (writeOk != YAFFS_OK) { - /* Clean up aborted write, skip to next block and - * try another chunk */ - yaffs_HandleWriteChunkError(dev, chunk, erasedOk); - continue; - } - - bi->skipErasedCheck = 1; - - /* Copy the data into the robustification buffer */ - yaffs_HandleWriteChunkOk(dev, chunk, data, tags); - - } while (writeOk != YAFFS_OK && - (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts)); - - if (!writeOk) - chunk = -1; - - if (attempts > 1) { - T(YAFFS_TRACE_ERROR, - (TSTR("**>> yaffs write required %d attempts" TENDSTR), - attempts)); - - dev->nRetriedWrites += (attempts - 1); - } - - return chunk; -} - - -/* - * Oldest Dirty Sequence Number handling. - */ - -/* yaffs_CalcOldestDirtySequence() - * yaffs_FindOldestDirtySequence() - * Calculate the oldest dirty sequence number if we don't know it. - */ -static void yaffs_CalcOldestDirtySequence(yaffs_Device *dev) -{ - int i; - unsigned seq; - unsigned blockNo = 0; - yaffs_BlockInfo *b; - - if(!dev->param.isYaffs2) - return; - - /* Find the oldest dirty sequence number. */ - seq = dev->sequenceNumber + 1; - b = dev->blockInfo; - for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) { - if (b->blockState == YAFFS_BLOCK_STATE_FULL && - (b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock && - b->sequenceNumber < seq) { - seq = b->sequenceNumber; - blockNo = i; - } - b++; - } - - if(blockNo){ - dev->oldestDirtySequence = seq; - dev->oldestDirtyBlock = blockNo; - } - -} - - -static void yaffs_FindOldestDirtySequence(yaffs_Device *dev) -{ - if(dev->param.isYaffs2 && !dev->oldestDirtySequence) - yaffs_CalcOldestDirtySequence(dev); -} - -/* - * yaffs_ClearOldestDirtySequence() - * Called when a block is erased or marked bad. (ie. when its sequenceNumber - * becomes invalid). If the value matches the oldest then we clear - * dev->oldestDirtySequence to force its recomputation. - */ -static void yaffs_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi) -{ - - if(!dev->param.isYaffs2) - return; - - if(!bi || bi->sequenceNumber == dev->oldestDirtySequence){ - dev->oldestDirtySequence = 0; - dev->oldestDirtyBlock = 0; - } -} - -/* - * yaffs_UpdateOldestDirtySequence() - * Update the oldest dirty sequence number whenever we dirty a block. - * Only do this if the oldestDirtySequence is actually being tracked. - */ -static void yaffs_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi) -{ - if(dev->param.isYaffs2 && dev->oldestDirtySequence){ - if(dev->oldestDirtySequence > bi->sequenceNumber){ - dev->oldestDirtySequence = bi->sequenceNumber; - dev->oldestDirtyBlock = blockNo; - } - } -} - -/* - * Block retiring for handling a broken block. - */ - -static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND) -{ - yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND); - - yaffs_InvalidateCheckpoint(dev); - - yaffs_ClearOldestDirtySequence(dev,bi); - - if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) { - if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) { - T(YAFFS_TRACE_ALWAYS, (TSTR( - "yaffs: Failed to mark bad and erase block %d" - TENDSTR), blockInNAND)); - } else { - yaffs_ExtendedTags tags; - int chunkId = blockInNAND * dev->param.nChunksPerBlock; - - __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__); - - memset(buffer, 0xff, dev->nDataBytesPerChunk); - yaffs_InitialiseTags(&tags); - tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK; - if (dev->param.writeChunkWithTagsToNAND(dev, chunkId - - dev->chunkOffset, buffer, &tags) != YAFFS_OK) - T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to " - TCONT("write bad block marker to block %d") - TENDSTR), blockInNAND)); - - yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); - } - } - - bi->blockState = YAFFS_BLOCK_STATE_DEAD; - bi->gcPrioritise = 0; - bi->needsRetiring = 0; - - dev->nRetiredBlocks++; -} - -/* - * Functions for robustisizing TODO - * - */ - -static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND, - const __u8 *data, - const yaffs_ExtendedTags *tags) -{ - dev=dev; - chunkInNAND=chunkInNAND; - data=data; - tags=tags; -} - -static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND, - const yaffs_ExtendedTags *tags) -{ - dev=dev; - chunkInNAND=chunkInNAND; - tags=tags; -} - -void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi) -{ - if (!bi->gcPrioritise) { - bi->gcPrioritise = 1; - dev->hasPendingPrioritisedGCs = 1; - bi->chunkErrorStrikes++; - - if (bi->chunkErrorStrikes > 3) { - bi->needsRetiring = 1; /* Too many stikes, so retire this */ - T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR))); - - } - } -} - -static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND, - int erasedOk) -{ - int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock; - yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND); - - yaffs_HandleChunkError(dev, bi); - - if (erasedOk) { - /* Was an actual write failure, so mark the block for retirement */ - bi->needsRetiring = 1; - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, - (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND)); - } - - /* Delete the chunk */ - yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__); - yaffs_SkipRestOfBlock(dev); -} - - -/*---------------- Name handling functions ------------*/ - -static __u16 yaffs_CalcNameSum(const YCHAR *name) -{ - __u16 sum = 0; - __u16 i = 1; - - const YUCHAR *bname = (const YUCHAR *) name; - if (bname) { - while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) { - -#ifdef CONFIG_YAFFS_CASE_INSENSITIVE - sum += yaffs_toupper(*bname) * i; -#else - sum += (*bname) * i; -#endif - i++; - bname++; - } - } - return sum; -} - -static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name) -{ -#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM - memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1)); - if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH) - yaffs_strcpy(obj->shortName, name); - else - obj->shortName[0] = _Y('\0'); -#endif - obj->sum = yaffs_CalcNameSum(name); -} - -/*-------------------- TNODES ------------------- - - * List of spare tnodes - * The list is hooked together using the first pointer - * in the tnode. - */ - - -static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev) -{ - yaffs_Tnode *tn = yaffs_AllocateRawTnode(dev); - if (tn){ - memset(tn, 0, dev->tnodeSize); - dev->nTnodes++; - } - - dev->nCheckpointBlocksRequired = 0; /* force recalculation*/ - - return tn; -} - -/* FreeTnode frees up a tnode and puts it back on the free list */ -static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn) -{ - yaffs_FreeRawTnode(dev,tn); - dev->nTnodes--; - dev->nCheckpointBlocksRequired = 0; /* force recalculation*/ -} - -static void yaffs_DeinitialiseTnodesAndObjects(yaffs_Device *dev) -{ - yaffs_DeinitialiseRawTnodesAndObjects(dev); - dev->nObjects = 0; - dev->nTnodes = 0; -} - - -void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, - unsigned val) -{ - __u32 *map = (__u32 *)tn; - __u32 bitInMap; - __u32 bitInWord; - __u32 wordInMap; - __u32 mask; - - pos &= YAFFS_TNODES_LEVEL0_MASK; - val >>= dev->chunkGroupBits; - - bitInMap = pos * dev->tnodeWidth; - wordInMap = bitInMap / 32; - bitInWord = bitInMap & (32 - 1); - - mask = dev->tnodeMask << bitInWord; - - map[wordInMap] &= ~mask; - map[wordInMap] |= (mask & (val << bitInWord)); - - if (dev->tnodeWidth > (32 - bitInWord)) { - bitInWord = (32 - bitInWord); - wordInMap++;; - mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord); - map[wordInMap] &= ~mask; - map[wordInMap] |= (mask & (val >> bitInWord)); - } -} - -static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, - unsigned pos) -{ - __u32 *map = (__u32 *)tn; - __u32 bitInMap; - __u32 bitInWord; - __u32 wordInMap; - __u32 val; - - pos &= YAFFS_TNODES_LEVEL0_MASK; - - bitInMap = pos * dev->tnodeWidth; - wordInMap = bitInMap / 32; - bitInWord = bitInMap & (32 - 1); - - val = map[wordInMap] >> bitInWord; - - if (dev->tnodeWidth > (32 - bitInWord)) { - bitInWord = (32 - bitInWord); - wordInMap++;; - val |= (map[wordInMap] << bitInWord); - } - - val &= dev->tnodeMask; - val <<= dev->chunkGroupBits; - - return val; -} - -/* ------------------- End of individual tnode manipulation -----------------*/ - -/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------ - * The look up tree is represented by the top tnode and the number of topLevel - * in the tree. 0 means only the level 0 tnode is in the tree. - */ - -/* FindLevel0Tnode finds the level 0 tnode, if one exists. */ -static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev, - yaffs_FileStructure *fStruct, - __u32 chunkId) -{ - yaffs_Tnode *tn = fStruct->top; - __u32 i; - int requiredTallness; - int level = fStruct->topLevel; - - dev=dev; - - /* Check sane level and chunk Id */ - if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) - return NULL; - - if (chunkId > YAFFS_MAX_CHUNK_ID) - return NULL; - - /* First check we're tall enough (ie enough topLevel) */ - - i = chunkId >> YAFFS_TNODES_LEVEL0_BITS; - requiredTallness = 0; - while (i) { - i >>= YAFFS_TNODES_INTERNAL_BITS; - requiredTallness++; - } - - if (requiredTallness > fStruct->topLevel) - return NULL; /* Not tall enough, so we can't find it */ - - /* Traverse down to level 0 */ - while (level > 0 && tn) { - tn = tn->internal[(chunkId >> - (YAFFS_TNODES_LEVEL0_BITS + - (level - 1) * - YAFFS_TNODES_INTERNAL_BITS)) & - YAFFS_TNODES_INTERNAL_MASK]; - level--; - } - - return tn; -} - -/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree. - * This happens in two steps: - * 1. If the tree isn't tall enough, then make it taller. - * 2. Scan down the tree towards the level 0 tnode adding tnodes if required. - * - * Used when modifying the tree. - * - * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will - * be plugged into the ttree. - */ - -static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, - yaffs_FileStructure *fStruct, - __u32 chunkId, - yaffs_Tnode *passedTn) -{ - int requiredTallness; - int i; - int l; - yaffs_Tnode *tn; - - __u32 x; - - - /* Check sane level and page Id */ - if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) - return NULL; - - if (chunkId > YAFFS_MAX_CHUNK_ID) - return NULL; - - /* First check we're tall enough (ie enough topLevel) */ - - x = chunkId >> YAFFS_TNODES_LEVEL0_BITS; - requiredTallness = 0; - while (x) { - x >>= YAFFS_TNODES_INTERNAL_BITS; - requiredTallness++; - } - - - if (requiredTallness > fStruct->topLevel) { - /* Not tall enough, gotta make the tree taller */ - for (i = fStruct->topLevel; i < requiredTallness; i++) { - - tn = yaffs_GetTnode(dev); - - if (tn) { - tn->internal[0] = fStruct->top; - fStruct->top = tn; - fStruct->topLevel++; - } else { - T(YAFFS_TRACE_ERROR, - (TSTR("yaffs: no more tnodes" TENDSTR))); - return NULL; - } - } - } - - /* Traverse down to level 0, adding anything we need */ - - l = fStruct->topLevel; - tn = fStruct->top; - - if (l > 0) { - while (l > 0 && tn) { - x = (chunkId >> - (YAFFS_TNODES_LEVEL0_BITS + - (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) & - YAFFS_TNODES_INTERNAL_MASK; - - - if ((l > 1) && !tn->internal[x]) { - /* Add missing non-level-zero tnode */ - tn->internal[x] = yaffs_GetTnode(dev); - if(!tn->internal[x]) - return NULL; - } else if (l == 1) { - /* Looking from level 1 at level 0 */ - if (passedTn) { - /* If we already have one, then release it.*/ - if (tn->internal[x]) - yaffs_FreeTnode(dev, tn->internal[x]); - tn->internal[x] = passedTn; - - } else if (!tn->internal[x]) { - /* Don't have one, none passed in */ - tn->internal[x] = yaffs_GetTnode(dev); - if(!tn->internal[x]) - return NULL; - } - } - - tn = tn->internal[x]; - l--; - } - } else { - /* top is level 0 */ - if (passedTn) { - memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8); - yaffs_FreeTnode(dev, passedTn); - } - } - - return tn; -} - -static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk, - yaffs_ExtendedTags *tags, int objectId, - int chunkInInode) -{ - int j; - - for (j = 0; theChunk && j < dev->chunkGroupSize; j++) { - if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock, - theChunk % dev->param.nChunksPerBlock)) { - - if(dev->chunkGroupSize == 1) - return theChunk; - else { - yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, - tags); - if (yaffs_TagsMatch(tags, objectId, chunkInInode)) { - /* found it; */ - return theChunk; - } - } - } - theChunk++; - } - return -1; -} - -#if 0 -/* Experimental code not being used yet. Might speed up file deletion */ -/* DeleteWorker scans backwards through the tnode tree and deletes all the - * chunks and tnodes in the file. - * Returns 1 if the tree was deleted. - * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete. - */ - -static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, - int chunkOffset, int *limit) -{ - int i; - int chunkInInode; - int theChunk; - yaffs_ExtendedTags tags; - int foundChunk; - yaffs_Device *dev = in->myDev; - - int allDone = 1; - - if (tn) { - if (level > 0) { - for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0; - i--) { - if (tn->internal[i]) { - if (limit && (*limit) < 0) { - allDone = 0; - } else { - allDone = - yaffs_DeleteWorker(in, - tn-> - internal - [i], - level - - 1, - (chunkOffset - << - YAFFS_TNODES_INTERNAL_BITS) - + i, - limit); - } - if (allDone) { - yaffs_FreeTnode(dev, - tn-> - internal[i]); - tn->internal[i] = NULL; - } - } - } - return (allDone) ? 1 : 0; - } else if (level == 0) { - int hitLimit = 0; - - for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit; - i--) { - theChunk = yaffs_GetChunkGroupBase(dev, tn, i); - if (theChunk) { - - chunkInInode = (chunkOffset << - YAFFS_TNODES_LEVEL0_BITS) + i; - - foundChunk = - yaffs_FindChunkInGroup(dev, - theChunk, - &tags, - in->objectId, - chunkInInode); - - if (foundChunk > 0) { - yaffs_DeleteChunk(dev, - foundChunk, 1, - __LINE__); - in->nDataChunks--; - if (limit) { - *limit = *limit - 1; - if (*limit <= 0) - hitLimit = 1; - } - - } - - yaffs_LoadLevel0Tnode(dev, tn, i, 0); - } - - } - return (i < 0) ? 1 : 0; - - } - - } - - return 1; - -} - -#endif - -static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk) -{ - yaffs_BlockInfo *theBlock; - unsigned blockNo; - - T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk)); - - blockNo = chunk / dev->param.nChunksPerBlock; - theBlock = yaffs_GetBlockInfo(dev, blockNo); - if (theBlock) { - theBlock->softDeletions++; - dev->nFreeChunks++; - yaffs_UpdateOldestDirtySequence(dev, blockNo, theBlock); - } -} - -/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file. - * All soft deleting does is increment the block's softdelete count and pulls the chunk out - * of the tnode. - * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted. - */ - -static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, - __u32 level, int chunkOffset) -{ - int i; - int theChunk; - int allDone = 1; - yaffs_Device *dev = in->myDev; - - if (tn) { - if (level > 0) { - - for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0; - i--) { - if (tn->internal[i]) { - allDone = - yaffs_SoftDeleteWorker(in, - tn-> - internal[i], - level - 1, - (chunkOffset - << - YAFFS_TNODES_INTERNAL_BITS) - + i); - if (allDone) { - yaffs_FreeTnode(dev, - tn-> - internal[i]); - tn->internal[i] = NULL; - } else { - /* Hoosterman... how could this happen? */ - } - } - } - return (allDone) ? 1 : 0; - } else if (level == 0) { - - for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) { - theChunk = yaffs_GetChunkGroupBase(dev, tn, i); - if (theChunk) { - /* Note this does not find the real chunk, only the chunk group. - * We make an assumption that a chunk group is not larger than - * a block. - */ - yaffs_SoftDeleteChunk(dev, theChunk); - yaffs_LoadLevel0Tnode(dev, tn, i, 0); - } - - } - return 1; - - } - - } - - return 1; - -} - -static void yaffs_SoftDeleteFile(yaffs_Object *obj) -{ - if (obj->deleted && - obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) { - if (obj->nDataChunks <= 0) { - /* Empty file with no duplicate object headers, just delete it immediately */ - yaffs_FreeTnode(obj->myDev, - obj->variant.fileVariant.top); - obj->variant.fileVariant.top = NULL; - T(YAFFS_TRACE_TRACING, - (TSTR("yaffs: Deleting empty file %d" TENDSTR), - obj->objectId)); - yaffs_DoGenericObjectDeletion(obj); - } else { - yaffs_SoftDeleteWorker(obj, - obj->variant.fileVariant.top, - obj->variant.fileVariant. - topLevel, 0); - obj->softDeleted = 1; - } - } -} - -/* Pruning removes any part of the file structure tree that is beyond the - * bounds of the file (ie that does not point to chunks). - * - * A file should only get pruned when its size is reduced. - * - * Before pruning, the chunks must be pulled from the tree and the - * level 0 tnode entries must be zeroed out. - * Could also use this for file deletion, but that's probably better handled - * by a special case. - * - * This function is recursive. For levels > 0 the function is called again on - * any sub-tree. For level == 0 we just check if the sub-tree has data. - * If there is no data in a subtree then it is pruned. - */ - -static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, - __u32 level, int del0) -{ - int i; - int hasData; - - if (tn) { - hasData = 0; - - if(level > 0){ - for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { - if (tn->internal[i]) { - tn->internal[i] = - yaffs_PruneWorker(dev, tn->internal[i], - level - 1, - (i == 0) ? del0 : 1); - } - - if (tn->internal[i]) - hasData++; - } - } else { - int tnodeSize_u32 = dev->tnodeSize/sizeof(__u32); - __u32 *map = (__u32 *)tn; - - for(i = 0; !hasData && i < tnodeSize_u32; i++){ - if(map[i]) - hasData++; - } - } - - if (hasData == 0 && del0) { - /* Free and return NULL */ - - yaffs_FreeTnode(dev, tn); - tn = NULL; - } - - } - - return tn; - -} - -static int yaffs_PruneFileStructure(yaffs_Device *dev, - yaffs_FileStructure *fStruct) -{ - int i; - int hasData; - int done = 0; - yaffs_Tnode *tn; - - if (fStruct->topLevel > 0) { - fStruct->top = - yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0); - - /* Now we have a tree with all the non-zero branches NULL but the height - * is the same as it was. - * Let's see if we can trim internal tnodes to shorten the tree. - * We can do this if only the 0th element in the tnode is in use - * (ie all the non-zero are NULL) - */ - - while (fStruct->topLevel && !done) { - tn = fStruct->top; - - hasData = 0; - for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) { - if (tn->internal[i]) - hasData++; - } - - if (!hasData) { - fStruct->top = tn->internal[0]; - fStruct->topLevel--; - yaffs_FreeTnode(dev, tn); - } else { - done = 1; - } - } - } - - return YAFFS_OK; -} - -/*-------------------- End of File Structure functions.-------------------*/ - - -/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */ -static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev) -{ - yaffs_Object *obj = yaffs_AllocateRawObject(dev); - - if (obj) { - dev->nObjects++; - - /* Now sweeten it up... */ - - memset(obj, 0, sizeof(yaffs_Object)); - obj->beingCreated = 1; - - obj->myDev = dev; - obj->hdrChunk = 0; - obj->variantType = YAFFS_OBJECT_TYPE_UNKNOWN; - YINIT_LIST_HEAD(&(obj->hardLinks)); - YINIT_LIST_HEAD(&(obj->hashLink)); - YINIT_LIST_HEAD(&obj->siblings); - - - /* Now make the directory sane */ - if (dev->rootDir) { - obj->parent = dev->rootDir; - ylist_add(&(obj->siblings), &dev->rootDir->variant.directoryVariant.children); - } - - /* Add it to the lost and found directory. - * NB Can't put root or lostNFound in lostNFound so - * check if lostNFound exists first - */ - if (dev->lostNFoundDir) - yaffs_AddObjectToDirectory(dev->lostNFoundDir, obj); - - obj->beingCreated = 0; - } - - dev->nCheckpointBlocksRequired = 0; /* force recalculation*/ - - return obj; -} - -static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number, - __u32 mode) -{ - - yaffs_Object *obj = - yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY); - if (obj) { - obj->fake = 1; /* it is fake so it might have no NAND presence... */ - obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */ - obj->unlinkAllowed = 0; /* ... or unlink it */ - obj->deleted = 0; - obj->unlinked = 0; - obj->yst_mode = mode; - obj->myDev = dev; - obj->hdrChunk = 0; /* Not a valid chunk. */ - } - - return obj; - -} - -static void yaffs_UnhashObject(yaffs_Object *obj) -{ - int bucket; - yaffs_Device *dev = obj->myDev; - - /* If it is still linked into the bucket list, free from the list */ - if (!ylist_empty(&obj->hashLink)) { - ylist_del_init(&obj->hashLink); - bucket = yaffs_HashFunction(obj->objectId); - dev->objectBucket[bucket].count--; - } -} - -/* FreeObject frees up a Object and puts it back on the free list */ -static void yaffs_FreeObject(yaffs_Object *obj) -{ - yaffs_Device *dev = obj->myDev; - - T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->myInode)); - - if (!obj) - YBUG(); - if (obj->parent) - YBUG(); - if (!ylist_empty(&obj->siblings)) - YBUG(); - - - if (obj->myInode) { - /* We're still hooked up to a cached inode. - * Don't delete now, but mark for later deletion - */ - obj->deferedFree = 1; - return; - } - - yaffs_UnhashObject(obj); - - yaffs_FreeRawObject(dev,obj); - dev->nObjects--; - dev->nCheckpointBlocksRequired = 0; /* force recalculation*/ -} - - -void yaffs_HandleDeferedFree(yaffs_Object *obj) -{ - if (obj->deferedFree) - yaffs_FreeObject(obj); -} - -static void yaffs_InitialiseTnodesAndObjects(yaffs_Device *dev) -{ - int i; - - dev->nObjects = 0; - dev->nTnodes = 0; - - yaffs_InitialiseRawTnodesAndObjects(dev); - - for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { - YINIT_LIST_HEAD(&dev->objectBucket[i].list); - dev->objectBucket[i].count = 0; - } -} - -static int yaffs_FindNiceObjectBucket(yaffs_Device *dev) -{ - int i; - int l = 999; - int lowest = 999999; - - - /* Search for the shortest list or one that - * isn't too long. - */ - - for (i = 0; i < 10 && lowest > 4; i++) { - dev->bucketFinder++; - dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS; - if (dev->objectBucket[dev->bucketFinder].count < lowest) { - lowest = dev->objectBucket[dev->bucketFinder].count; - l = dev->bucketFinder; - } - - } - - return l; -} - -static int yaffs_CreateNewObjectNumber(yaffs_Device *dev) -{ - int bucket = yaffs_FindNiceObjectBucket(dev); - - /* Now find an object value that has not already been taken - * by scanning the list. - */ - - int found = 0; - struct ylist_head *i; - - __u32 n = (__u32) bucket; - - /* yaffs_CheckObjectHashSanity(); */ - - while (!found) { - found = 1; - n += YAFFS_NOBJECT_BUCKETS; - if (1 || dev->objectBucket[bucket].count > 0) { - ylist_for_each(i, &dev->objectBucket[bucket].list) { - /* If there is already one in the list */ - if (i && ylist_entry(i, yaffs_Object, - hashLink)->objectId == n) { - found = 0; - } - } - } - } - - return n; -} - -static void yaffs_HashObject(yaffs_Object *in) -{ - int bucket = yaffs_HashFunction(in->objectId); - yaffs_Device *dev = in->myDev; - - ylist_add(&in->hashLink, &dev->objectBucket[bucket].list); - dev->objectBucket[bucket].count++; -} - -yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number) -{ - int bucket = yaffs_HashFunction(number); - struct ylist_head *i; - yaffs_Object *in; - - ylist_for_each(i, &dev->objectBucket[bucket].list) { - /* Look if it is in the list */ - if (i) { - in = ylist_entry(i, yaffs_Object, hashLink); - if (in->objectId == number) { - - /* Don't tell the VFS about this one if it is defered free */ - if (in->deferedFree) - return NULL; - - return in; - } - } - } - - return NULL; -} - -yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number, - yaffs_ObjectType type) -{ - yaffs_Object *theObject=NULL; - yaffs_Tnode *tn = NULL; - - if (number < 0) - number = yaffs_CreateNewObjectNumber(dev); - - if (type == YAFFS_OBJECT_TYPE_FILE) { - tn = yaffs_GetTnode(dev); - if (!tn) - return NULL; - } - - theObject = yaffs_AllocateEmptyObject(dev); - if (!theObject){ - if(tn) - yaffs_FreeTnode(dev,tn); - return NULL; - } - - - if (theObject) { - theObject->fake = 0; - theObject->renameAllowed = 1; - theObject->unlinkAllowed = 1; - theObject->objectId = number; - yaffs_HashObject(theObject); - theObject->variantType = type; -#ifdef CONFIG_YAFFS_WINCE - yfsd_WinFileTimeNow(theObject->win_atime); - theObject->win_ctime[0] = theObject->win_mtime[0] = - theObject->win_atime[0]; - theObject->win_ctime[1] = theObject->win_mtime[1] = - theObject->win_atime[1]; - -#else - - theObject->yst_atime = theObject->yst_mtime = - theObject->yst_ctime = Y_CURRENT_TIME; -#endif - switch (type) { - case YAFFS_OBJECT_TYPE_FILE: - theObject->variant.fileVariant.fileSize = 0; - theObject->variant.fileVariant.scannedFileSize = 0; - theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */ - theObject->variant.fileVariant.topLevel = 0; - theObject->variant.fileVariant.top = tn; - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - YINIT_LIST_HEAD(&theObject->variant.directoryVariant. - children); - YINIT_LIST_HEAD(&theObject->variant.directoryVariant. - dirty); - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - case YAFFS_OBJECT_TYPE_HARDLINK: - case YAFFS_OBJECT_TYPE_SPECIAL: - /* No action required */ - break; - case YAFFS_OBJECT_TYPE_UNKNOWN: - /* todo this should not happen */ - break; - } - } - - return theObject; -} - -static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, - int number, - yaffs_ObjectType type) -{ - yaffs_Object *theObject = NULL; - - if (number > 0) - theObject = yaffs_FindObjectByNumber(dev, number); - - if (!theObject) - theObject = yaffs_CreateNewObject(dev, number, type); - - return theObject; - -} - - -static YCHAR *yaffs_CloneString(const YCHAR *str) -{ - YCHAR *newStr = NULL; - int len; - - if (!str) - str = _Y(""); - - len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH); - newStr = YMALLOC((len + 1) * sizeof(YCHAR)); - if (newStr){ - yaffs_strncpy(newStr, str,len); - newStr[len] = 0; - } - return newStr; - -} - -/* - * Mknod (create) a new object. - * equivalentObject only has meaning for a hard link; - * aliasString only has meaning for a symlink. - * rdev only has meaning for devices (a subset of special objects) - */ - -static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type, - yaffs_Object *parent, - const YCHAR *name, - __u32 mode, - __u32 uid, - __u32 gid, - yaffs_Object *equivalentObject, - const YCHAR *aliasString, __u32 rdev) -{ - yaffs_Object *in; - YCHAR *str = NULL; - - yaffs_Device *dev = parent->myDev; - - /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/ - if (yaffs_FindObjectByName(parent, name)) - return NULL; - - if (type == YAFFS_OBJECT_TYPE_SYMLINK) { - str = yaffs_CloneString(aliasString); - if (!str) - return NULL; - } - - in = yaffs_CreateNewObject(dev, -1, type); - - if (!in){ - if(str) - YFREE(str); - return NULL; - } - - - - - - if (in) { - in->hdrChunk = 0; - in->valid = 1; - in->variantType = type; - - in->yst_mode = mode; - -#ifdef CONFIG_YAFFS_WINCE - yfsd_WinFileTimeNow(in->win_atime); - in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0]; - in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1]; - -#else - in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME; - - in->yst_rdev = rdev; - in->yst_uid = uid; - in->yst_gid = gid; -#endif - in->nDataChunks = 0; - - yaffs_SetObjectName(in, name); - in->dirty = 1; - - yaffs_AddObjectToDirectory(parent, in); - - in->myDev = parent->myDev; - - switch (type) { - case YAFFS_OBJECT_TYPE_SYMLINK: - in->variant.symLinkVariant.alias = str; - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - in->variant.hardLinkVariant.equivalentObject = - equivalentObject; - in->variant.hardLinkVariant.equivalentObjectId = - equivalentObject->objectId; - ylist_add(&in->hardLinks, &equivalentObject->hardLinks); - break; - case YAFFS_OBJECT_TYPE_FILE: - case YAFFS_OBJECT_TYPE_DIRECTORY: - case YAFFS_OBJECT_TYPE_SPECIAL: - case YAFFS_OBJECT_TYPE_UNKNOWN: - /* do nothing */ - break; - } - - if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0, NULL) < 0) { - /* Could not create the object header, fail the creation */ - yaffs_DeleteObject(in); - in = NULL; - } - - yaffs_UpdateParent(parent); - } - - return in; -} - -yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name, - __u32 mode, __u32 uid, __u32 gid) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode, - uid, gid, NULL, NULL, 0); -} - -yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name, - __u32 mode, __u32 uid, __u32 gid) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name, - mode, uid, gid, NULL, NULL, 0); -} - -yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name, - __u32 mode, __u32 uid, __u32 gid, __u32 rdev) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode, - uid, gid, NULL, NULL, rdev); -} - -yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name, - __u32 mode, __u32 uid, __u32 gid, - const YCHAR *alias) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode, - uid, gid, NULL, alias, 0); -} - -/* yaffs_Link returns the object id of the equivalent object.*/ -yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, - yaffs_Object *equivalentObject) -{ - /* Get the real object in case we were fed a hard link as an equivalent object */ - equivalentObject = yaffs_GetEquivalentObject(equivalentObject); - - if (yaffs_MknodObject - (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0, - equivalentObject, NULL, 0)) { - return equivalentObject; - } else { - return NULL; - } - -} - -static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, - const YCHAR *newName, int force, int shadows) -{ - int unlinkOp; - int deleteOp; - - yaffs_Object *existingTarget; - - if (newDir == NULL) - newDir = obj->parent; /* use the old directory */ - - if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { - T(YAFFS_TRACE_ALWAYS, - (TSTR - ("tragedy: yaffs_ChangeObjectName: newDir is not a directory" - TENDSTR))); - YBUG(); - } - - /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */ - if (obj->myDev->param.isYaffs2) - unlinkOp = (newDir == obj->myDev->unlinkedDir); - else - unlinkOp = (newDir == obj->myDev->unlinkedDir - && obj->variantType == YAFFS_OBJECT_TYPE_FILE); - - deleteOp = (newDir == obj->myDev->deletedDir); - - existingTarget = yaffs_FindObjectByName(newDir, newName); - - /* If the object is a file going into the unlinked directory, - * then it is OK to just stuff it in since duplicate names are allowed. - * else only proceed if the new name does not exist and if we're putting - * it into a directory. - */ - if ((unlinkOp || - deleteOp || - force || - (shadows > 0) || - !existingTarget) && - newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) { - yaffs_SetObjectName(obj, newName); - obj->dirty = 1; - - yaffs_AddObjectToDirectory(newDir, obj); - - if (unlinkOp) - obj->unlinked = 1; - - /* If it is a deletion then we mark it as a shrink for gc purposes. */ - if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows, NULL) >= 0) - return YAFFS_OK; - } - - return YAFFS_FAIL; -} - -int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, - yaffs_Object *newDir, const YCHAR *newName) -{ - yaffs_Object *obj = NULL; - yaffs_Object *existingTarget = NULL; - int force = 0; - int result; - yaffs_Device *dev; - - - if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) - YBUG(); - if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) - YBUG(); - - dev = oldDir->myDev; - -#ifdef CONFIG_YAFFS_CASE_INSENSITIVE - /* Special case for case insemsitive systems (eg. WinCE). - * While look-up is case insensitive, the name isn't. - * Therefore we might want to change x.txt to X.txt - */ - if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) - force = 1; -#endif - - if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH) - /* ENAMETOOLONG */ - return YAFFS_FAIL; - - obj = yaffs_FindObjectByName(oldDir, oldName); - - if (obj && obj->renameAllowed) { - - /* Now do the handling for an existing target, if there is one */ - - existingTarget = yaffs_FindObjectByName(newDir, newName); - if (existingTarget && - existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY && - !ylist_empty(&existingTarget->variant.directoryVariant.children)) { - /* There is a target that is a non-empty directory, so we fail */ - return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */ - } else if (existingTarget && existingTarget != obj) { - /* Nuke the target first, using shadowing, - * but only if it isn't the same object. - * - * Note we must disable gc otherwise it can mess up the shadowing. - * - */ - dev->gcDisable=1; - yaffs_ChangeObjectName(obj, newDir, newName, force, - existingTarget->objectId); - existingTarget->isShadowed = 1; - yaffs_UnlinkObject(existingTarget); - dev->gcDisable=0; - } - - result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0); - - yaffs_UpdateParent(oldDir); - if(newDir != oldDir) - yaffs_UpdateParent(newDir); - - return result; - } - return YAFFS_FAIL; -} - -/*------------------------- Block Management and Page Allocation ----------------*/ - -static int yaffs_InitialiseBlocks(yaffs_Device *dev) -{ - int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1; - - dev->blockInfo = NULL; - dev->chunkBits = NULL; - - dev->allocationBlock = -1; /* force it to get a new one */ - - /* If the first allocation strategy fails, thry the alternate one */ - dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo)); - if (!dev->blockInfo) { - dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo)); - dev->blockInfoAlt = 1; - } else - dev->blockInfoAlt = 0; - - if (dev->blockInfo) { - /* Set up dynamic blockinfo stuff. */ - dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */ - dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks); - if (!dev->chunkBits) { - dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks); - dev->chunkBitsAlt = 1; - } else - dev->chunkBitsAlt = 0; - } - - if (dev->blockInfo && dev->chunkBits) { - memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo)); - memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks); - return YAFFS_OK; - } - - return YAFFS_FAIL; -} - -static void yaffs_DeinitialiseBlocks(yaffs_Device *dev) -{ - if (dev->blockInfoAlt && dev->blockInfo) - YFREE_ALT(dev->blockInfo); - else if (dev->blockInfo) - YFREE(dev->blockInfo); - - dev->blockInfoAlt = 0; - - dev->blockInfo = NULL; - - if (dev->chunkBitsAlt && dev->chunkBits) - YFREE_ALT(dev->chunkBits); - else if (dev->chunkBits) - YFREE(dev->chunkBits); - dev->chunkBitsAlt = 0; - dev->chunkBits = NULL; -} - -static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev, - yaffs_BlockInfo *bi) -{ - - if (!dev->param.isYaffs2) - return 1; /* disqualification only applies to yaffs2. */ - - if (!bi->hasShrinkHeader) - return 1; /* can gc */ - - yaffs_FindOldestDirtySequence(dev); - - /* Can't do gc of this block if there are any blocks older than this one that have - * discarded pages. - */ - return (bi->sequenceNumber <= dev->oldestDirtySequence); -} - -/* - * yaffs_FindRefreshBlock() - * periodically finds the oldest full block by sequence number for refreshing. - * Only for yaffs2. - */ -static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev) -{ - __u32 b ; - - __u32 oldest = 0; - __u32 oldestSequence = 0; - - yaffs_BlockInfo *bi; - - /* - * If refresh period < 10 then refreshing is disabled. - */ - if(dev->param.refreshPeriod < 10 || - !dev->param.isYaffs2) - return oldest; - - /* - * Fix broken values. - */ - if(dev->refreshSkip > dev->param.refreshPeriod) - dev->refreshSkip = dev->param.refreshPeriod; - - if(dev->refreshSkip > 0) - return oldest; - - /* - * Refresh skip is now zero. - * We'll do a refresh this time around.... - * Update the refresh skip and find the oldest block. - */ - dev->refreshSkip = dev->param.refreshPeriod; - dev->refreshCount++; - bi = dev->blockInfo; - for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){ - - if (bi->blockState == YAFFS_BLOCK_STATE_FULL){ - - if(oldest < 1 || - bi->sequenceNumber < oldestSequence){ - oldest = b; - oldestSequence = bi->sequenceNumber; - } - } - bi++; - } - - if (oldest > 0) { - T(YAFFS_TRACE_GC, - (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR), - dev->refreshCount, oldest, oldestSequence)); - } - - return oldest; -} - - -static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo) -{ - yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo); - - int erasedOk = 0; - - /* If the block is still healthy erase it and mark as clean. - * If the block has had a data failure, then retire it. - */ - - T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE, - (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR), - blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : "")); - - yaffs_ClearOldestDirtySequence(dev,bi); - - bi->blockState = YAFFS_BLOCK_STATE_DIRTY; - - /* If this is the block being garbage collected then stop gc'ing this block */ - if(blockNo == dev->gcBlock) - dev->gcBlock = 0; - - /* If this block is currently the best candidate for gc then drop as a candidate */ - if(blockNo == dev->gcDirtiest){ - dev->gcDirtiest = 0; - dev->gcPagesInUse = 0; - } - - if (!bi->needsRetiring) { - yaffs_InvalidateCheckpoint(dev); - erasedOk = yaffs_EraseBlockInNAND(dev, blockNo); - if (!erasedOk) { - dev->nErasureFailures++; - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, - (TSTR("**>> Erasure failed %d" TENDSTR), blockNo)); - } - } - - if (erasedOk && - ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) { - int i; - for (i = 0; i < dev->param.nChunksPerBlock; i++) { - if (!yaffs_CheckChunkErased - (dev, blockNo * dev->param.nChunksPerBlock + i)) { - T(YAFFS_TRACE_ERROR, - (TSTR - (">>Block %d erasure supposedly OK, but chunk %d not erased" - TENDSTR), blockNo, i)); - } - } - } - - if (erasedOk) { - /* Clean it up... */ - bi->blockState = YAFFS_BLOCK_STATE_EMPTY; - bi->sequenceNumber = 0; - dev->nErasedBlocks++; - bi->pagesInUse = 0; - bi->softDeletions = 0; - bi->hasShrinkHeader = 0; - bi->skipErasedCheck = 1; /* This is clean, so no need to check */ - bi->gcPrioritise = 0; - yaffs_ClearChunkBits(dev, blockNo); - - T(YAFFS_TRACE_ERASE, - (TSTR("Erased block %d" TENDSTR), blockNo)); - } else { - dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */ - - yaffs_RetireBlock(dev, blockNo); - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, - (TSTR("**>> Block %d retired" TENDSTR), blockNo)); - } -} - -static int yaffs_FindBlockForAllocation(yaffs_Device *dev) -{ - int i; - - yaffs_BlockInfo *bi; - - if (dev->nErasedBlocks < 1) { - /* Hoosterman we've got a problem. - * Can't get space to gc - */ - T(YAFFS_TRACE_ERROR, - (TSTR("yaffs tragedy: no more erased blocks" TENDSTR))); - - return -1; - } - - /* Find an empty block. */ - - for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) { - dev->allocationBlockFinder++; - if (dev->allocationBlockFinder < dev->internalStartBlock - || dev->allocationBlockFinder > dev->internalEndBlock) { - dev->allocationBlockFinder = dev->internalStartBlock; - } - - bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder); - - if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) { - bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING; - dev->sequenceNumber++; - bi->sequenceNumber = dev->sequenceNumber; - dev->nErasedBlocks--; - T(YAFFS_TRACE_ALLOCATE, - (TSTR("Allocated block %d, seq %d, %d left" TENDSTR), - dev->allocationBlockFinder, dev->sequenceNumber, - dev->nErasedBlocks)); - return dev->allocationBlockFinder; - } - } - - T(YAFFS_TRACE_ALWAYS, - (TSTR - ("yaffs tragedy: no more erased blocks, but there should have been %d" - TENDSTR), dev->nErasedBlocks)); - - return -1; -} - - - -static int yaffs_CheckpointRequired(yaffs_Device *dev) -{ - int nblocks = dev->internalEndBlock - dev->internalStartBlock + 1 ; - return dev->param.isYaffs2 && - !dev->param.skipCheckpointWrite && - (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS); -} -static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev) -{ - if (!dev->nCheckpointBlocksRequired && - yaffs_CheckpointRequired(dev)){ - /* Not a valid value so recalculate */ - int nBytes = 0; - int nBlocks; - int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1); - - nBytes += sizeof(yaffs_CheckpointValidity); - nBytes += sizeof(yaffs_CheckpointDevice); - nBytes += devBlocks * sizeof(yaffs_BlockInfo); - nBytes += devBlocks * dev->chunkBitmapStride; - nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjects); - nBytes += (dev->tnodeSize + sizeof(__u32)) * (dev->nTnodes); - nBytes += sizeof(yaffs_CheckpointValidity); - nBytes += sizeof(__u32); /* checksum*/ - - /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */ - - nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3; - - dev->nCheckpointBlocksRequired = nBlocks; - } - - return dev->nCheckpointBlocksRequired; -} - -/* - * Check if there's space to allocate... - * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()? - */ -static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks) -{ - int reservedChunks; - int reservedBlocks = dev->param.nReservedBlocks; - int checkpointBlocks; - - if (dev->param.isYaffs2) { - checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) - - dev->blocksInCheckpoint; - if (checkpointBlocks < 0) - checkpointBlocks = 0; - } else { - checkpointBlocks = 0; - } - - reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock); - - return (dev->nFreeChunks > (reservedChunks + nChunks)); -} - -static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve, - yaffs_BlockInfo **blockUsedPtr) -{ - int retVal; - yaffs_BlockInfo *bi; - - if (dev->allocationBlock < 0) { - /* Get next block to allocate off */ - dev->allocationBlock = yaffs_FindBlockForAllocation(dev); - dev->allocationPage = 0; - } - - if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) { - /* Not enough space to allocate unless we're allowed to use the reserve. */ - return -1; - } - - if (dev->nErasedBlocks < dev->param.nReservedBlocks - && dev->allocationPage == 0) { - T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR))); - } - - /* Next page please.... */ - if (dev->allocationBlock >= 0) { - bi = yaffs_GetBlockInfo(dev, dev->allocationBlock); - - retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) + - dev->allocationPage; - bi->pagesInUse++; - yaffs_SetChunkBit(dev, dev->allocationBlock, - dev->allocationPage); - - dev->allocationPage++; - - dev->nFreeChunks--; - - /* If the block is full set the state to full */ - if (dev->allocationPage >= dev->param.nChunksPerBlock) { - bi->blockState = YAFFS_BLOCK_STATE_FULL; - dev->allocationBlock = -1; - } - - if (blockUsedPtr) - *blockUsedPtr = bi; - - return retVal; - } - - T(YAFFS_TRACE_ERROR, - (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); - - return -1; -} - -static int yaffs_GetErasedChunks(yaffs_Device *dev) -{ - int n; - - n = dev->nErasedBlocks * dev->param.nChunksPerBlock; - - if (dev->allocationBlock > 0) - n += (dev->param.nChunksPerBlock - dev->allocationPage); - - return n; - -} - -/* - * yaffs_SkipRestOfBlock() skips over the rest of the allocation block - * if we don't want to write to it. - */ -static void yaffs_SkipRestOfBlock(yaffs_Device *dev) -{ - if(dev->allocationBlock > 0){ - yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock); - if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){ - bi->blockState = YAFFS_BLOCK_STATE_FULL; - dev->allocationBlock = -1; - } - } -} - - -static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block, - int wholeBlock) -{ - int oldChunk; - int newChunk; - int markNAND; - int retVal = YAFFS_OK; - int cleanups = 0; - int i; - int isCheckpointBlock; - int matchingChunk; - int maxCopies; - - int chunksBefore = yaffs_GetErasedChunks(dev); - int chunksAfter; - - yaffs_ExtendedTags tags; - - yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block); - - yaffs_Object *object; - - isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT); - - - T(YAFFS_TRACE_TRACING, - (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR), - block, - bi->pagesInUse, - bi->hasShrinkHeader, - wholeBlock)); - - /*yaffs_VerifyFreeChunks(dev); */ - - if(bi->blockState == YAFFS_BLOCK_STATE_FULL) - bi->blockState = YAFFS_BLOCK_STATE_COLLECTING; - - bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */ - - dev->gcDisable = 1; - - if (isCheckpointBlock || - !yaffs_StillSomeChunkBits(dev, block)) { - T(YAFFS_TRACE_TRACING, - (TSTR - ("Collecting block %d that has no chunks in use" TENDSTR), - block)); - yaffs_BlockBecameDirty(dev, block); - } else { - - __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__); - - yaffs_VerifyBlock(dev, bi, block); - - maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 5; - oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk; - - for (/* init already done */; - retVal == YAFFS_OK && - dev->gcChunk < dev->param.nChunksPerBlock && - (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) && - maxCopies > 0; - dev->gcChunk++, oldChunk++) { - if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) { - - /* This page is in use and might need to be copied off */ - - maxCopies--; - - markNAND = 1; - - yaffs_InitialiseTags(&tags); - - yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk, - buffer, &tags); - - object = - yaffs_FindObjectByNumber(dev, - tags.objectId); - - T(YAFFS_TRACE_GC_DETAIL, - (TSTR - ("Collecting chunk in block %d, %d %d %d " TENDSTR), - dev->gcChunk, tags.objectId, tags.chunkId, - tags.byteCount)); - - if (object && !yaffs_SkipVerification(dev)) { - if (tags.chunkId == 0) - matchingChunk = object->hdrChunk; - else if (object->softDeleted) - matchingChunk = oldChunk; /* Defeat the test */ - else - matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL); - - if (oldChunk != matchingChunk) - T(YAFFS_TRACE_ERROR, - (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR), - oldChunk, matchingChunk, tags.objectId, tags.chunkId)); - - } - - if (!object) { - T(YAFFS_TRACE_ERROR, - (TSTR - ("page %d in gc has no object: %d %d %d " - TENDSTR), oldChunk, - tags.objectId, tags.chunkId, tags.byteCount)); - } - - if (object && - object->deleted && - object->softDeleted && - tags.chunkId != 0) { - /* Data chunk in a soft deleted file, throw it away - * It's a soft deleted data chunk, - * No need to copy this, just forget about it and - * fix up the object. - */ - - /* Free chunks already includes softdeleted chunks. - * How ever this chunk is going to soon be really deleted - * which will increment free chunks. - * We have to decrement free chunks so this works out properly. - */ - dev->nFreeChunks--; - - object->nDataChunks--; - - if (object->nDataChunks <= 0) { - /* remeber to clean up the object */ - dev->gcCleanupList[cleanups] = - tags.objectId; - cleanups++; - } - markNAND = 0; - } else if (0) { - /* Todo object && object->deleted && object->nDataChunks == 0 */ - /* Deleted object header with no data chunks. - * Can be discarded and the file deleted. - */ - object->hdrChunk = 0; - yaffs_FreeTnode(object->myDev, - object->variant. - fileVariant.top); - object->variant.fileVariant.top = NULL; - yaffs_DoGenericObjectDeletion(object); - - } else if (object) { - /* It's either a data chunk in a live file or - * an ObjectHeader, so we're interested in it. - * NB Need to keep the ObjectHeaders of deleted files - * until the whole file has been deleted off - */ - tags.serialNumber++; - - dev->nGCCopies++; - - if (tags.chunkId == 0) { - /* It is an object Id, - * We need to nuke the shrinkheader flags first - * Also need to clean up shadowing. - * We no longer want the shrinkHeader flag since its work is done - * and if it is left in place it will mess up scanning. - */ - - yaffs_ObjectHeader *oh; - oh = (yaffs_ObjectHeader *)buffer; - - oh->isShrink = 0; - tags.extraIsShrinkHeader = 0; - - oh->shadowsObject = 0; - oh->inbandShadowsObject = 0; - tags.extraShadows = 0; - - /* Update file size */ - if(object->variantType == YAFFS_OBJECT_TYPE_FILE){ - oh->fileSize = object->variant.fileVariant.fileSize; - tags.extraFileLength = oh->fileSize; - } - - yaffs_VerifyObjectHeader(object, oh, &tags, 1); - newChunk = - yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1); - } else - newChunk = - yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1); - - if (newChunk < 0) { - retVal = YAFFS_FAIL; + if (tn) { + if (level > 0) { + for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0; + i--) { + if (tn->internal[i]) { + if (limit && (*limit) < 0) { + allDone = 0; } else { - - /* Ok, now fix up the Tnodes etc. */ - - if (tags.chunkId == 0) { - /* It's a header */ - object->hdrChunk = newChunk; - object->serial = tags.serialNumber; - } else { - /* It's a data chunk */ - int ok; - ok = yaffs_PutChunkIntoFile - (object, - tags.chunkId, - newChunk, 0); - } + allDone = + yaffs_DeleteWorker(in, + tn-> + internal + [i], + level - + 1, + (chunkOffset + << + YAFFS_TNODES_INTERNAL_BITS) + + i, + limit); + } + if (allDone) { + yaffs_FreeTnode(dev, + tn-> + internal[i]); + tn->internal[i] = NULL; } } - - if (retVal == YAFFS_OK) - yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__); - - } - } - - yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); - - - /* Do any required cleanups */ - for (i = 0; i < cleanups; i++) { - /* Time to delete the file too */ - object = - yaffs_FindObjectByNumber(dev, - dev->gcCleanupList[i]); - if (object) { - yaffs_FreeTnode(dev, - object->variant.fileVariant. - top); - object->variant.fileVariant.top = NULL; - T(YAFFS_TRACE_GC, - (TSTR - ("yaffs: About to finally delete object %d" - TENDSTR), object->objectId)); - yaffs_DoGenericObjectDeletion(object); - object->myDev->nDeletedFiles--; - } - - } - - } - - yaffs_VerifyCollectedBlock(dev, bi, block); - - - - if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) { - /* - * The gc did not complete. Set block state back to FULL - * because checkpointing does not restore gc. - */ - bi->blockState = YAFFS_BLOCK_STATE_FULL; - } else { - /* The gc completed. */ - chunksAfter = yaffs_GetErasedChunks(dev); - if (chunksBefore >= chunksAfter) { - T(YAFFS_TRACE_GC, - (TSTR - ("gc did not increase free chunks before %d after %d" - TENDSTR), chunksBefore, chunksAfter)); - } - dev->gcBlock = 0; - dev->gcChunk = 0; - } - - dev->gcDisable = 0; - - return retVal; -} - -/* - * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough) - * for garbage collection. - */ - -static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev, - int aggressive, - int background) -{ - int i; - int iterations; - unsigned selected = 0; - int prioritised = 0; - int prioritisedExists = 0; - yaffs_BlockInfo *bi; - int threshold; - - /* First let's see if we need to grab a prioritised block */ - if (dev->hasPendingPrioritisedGCs && !aggressive) { - dev->gcDirtiest = 0; - bi = dev->blockInfo; - for (i = dev->internalStartBlock; - i <= dev->internalEndBlock && !selected; - i++) { - - if (bi->gcPrioritise) { - prioritisedExists = 1; - if (bi->blockState == YAFFS_BLOCK_STATE_FULL && - yaffs_BlockNotDisqualifiedFromGC(dev, bi)) { - selected = i; - prioritised = 1; - } - } - bi++; - } - - /* - * If there is a prioritised block and none was selected then - * this happened because there is at least one old dirty block gumming - * up the works. Let's gc the oldest dirty block. - */ - - if(prioritisedExists && - !selected && - dev->oldestDirtyBlock > 0) - selected = dev->oldestDirtyBlock; - - if (!prioritisedExists) /* None found, so we can clear this */ - dev->hasPendingPrioritisedGCs = 0; - } - - /* If we're doing aggressive GC then we are happy to take a less-dirty block, and - * search harder. - * else (we're doing a leasurely gc), then we only bother to do this if the - * block has only a few pages in use. - */ - - if (!selected){ - int pagesUsed; - int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1; - if (aggressive){ - threshold = dev->param.nChunksPerBlock; - iterations = nBlocks; - } else { - int maxThreshold = dev->param.nChunksPerBlock/2; - threshold = background ? - (dev->gcNotDone + 2) * 2 : 0; - if(threshold maxThreshold) - threshold = maxThreshold; - - iterations = nBlocks / 16 + 1; - if (iterations > 100) - iterations = 100; - } - - for (i = 0; - i < iterations && - (dev->gcDirtiest < 1 || - dev->gcPagesInUse > YAFFS_GC_GOOD_ENOUGH); - i++) { - dev->gcBlockFinder++; - if (dev->gcBlockFinder < dev->internalStartBlock || - dev->gcBlockFinder > dev->internalEndBlock) - dev->gcBlockFinder = dev->internalStartBlock; - - bi = yaffs_GetBlockInfo(dev, dev->gcBlockFinder); - - pagesUsed = bi->pagesInUse - bi->softDeletions; - - if (bi->blockState == YAFFS_BLOCK_STATE_FULL && - pagesUsed < dev->param.nChunksPerBlock && - (dev->gcDirtiest < 1 || pagesUsed < dev->gcPagesInUse) && - yaffs_BlockNotDisqualifiedFromGC(dev, bi)) { - dev->gcDirtiest = dev->gcBlockFinder; - dev->gcPagesInUse = pagesUsed; } - } - - if(dev->gcDirtiest > 0 && dev->gcPagesInUse <= threshold) - selected = dev->gcDirtiest; - } - - /* - * If nothing has been selected for a while, try selecting the oldest dirty - * because that's gumming up the works. - */ - - if(!selected && dev->param.isYaffs2 && - dev->gcNotDone >= ( background ? 10 : 20)){ - yaffs_FindOldestDirtySequence(dev); - if(dev->oldestDirtyBlock > 0) { - selected = dev->oldestDirtyBlock; - dev->gcDirtiest = selected; - dev->oldestDirtyGCs++; - bi = yaffs_GetBlockInfo(dev, selected); - dev->gcPagesInUse = bi->pagesInUse - bi->softDeletions; - } else - dev->gcNotDone = 0; - } - - if(selected){ - T(YAFFS_TRACE_GC, - (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), - selected, - dev->param.nChunksPerBlock - dev->gcPagesInUse, - prioritised)); - - if(background) - dev->backgroundGCs++; - dev->gcDirtiest = 0; - dev->gcPagesInUse = 0; - dev->gcNotDone = 0; - if(dev->refreshSkip > 0) - dev->refreshSkip--; - } else{ - dev->gcNotDone++; - T(YAFFS_TRACE_GC, - (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR), - dev->gcBlockFinder, dev->gcNotDone, - threshold, - dev->gcDirtiest, dev->gcPagesInUse, - dev->oldestDirtyBlock, - background ? " bg" : "")); - } - - return selected; -} - -/* New garbage collector - * If we're very low on erased blocks then we do aggressive garbage collection - * otherwise we do "leasurely" garbage collection. - * Aggressive gc looks further (whole array) and will accept less dirty blocks. - * Passive gc only inspects smaller areas and will only accept more dirty blocks. - * - * The idea is to help clear out space in a more spread-out manner. - * Dunno if it really does anything useful. - */ -static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background) -{ - int aggressive = 0; - int gcOk = YAFFS_OK; - int maxTries = 0; - - int minErased; - int erasedChunks; - - int checkpointBlockAdjust; - - if(dev->param.gcControl && - (dev->param.gcControl(dev) & 1) == 0) - return YAFFS_OK; - - if (dev->gcDisable) { - /* Bail out so we don't get recursive gc */ - return YAFFS_OK; - } + return (allDone) ? 1 : 0; + } else if (level == 0) { + int hitLimit = 0; - /* This loop should pass the first time. - * We'll only see looping here if the collection does not increase space. - */ + for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit; + i--) { + theChunk = yaffs_GetChunkGroupBase(dev, tn, i); + if (theChunk) { - do { - maxTries++; + chunkInInode = (chunkOffset << + YAFFS_TNODES_LEVEL0_BITS) + i; - checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint; - if (checkpointBlockAdjust < 0) - checkpointBlockAdjust = 0; + foundChunk = + yaffs_FindChunkInGroup(dev, + theChunk, + &tags, + in->objectId, + chunkInInode); - minErased = dev->param.nReservedBlocks + checkpointBlockAdjust + 1; - erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock; + if (foundChunk > 0) { + yaffs_DeleteChunk(dev, + foundChunk, 1, + __LINE__); + in->nDataChunks--; + if (limit) { + *limit = *limit - 1; + if (*limit <= 0) + hitLimit = 1; + } - /* If we need a block soon then do aggressive gc.*/ - if (dev->nErasedBlocks < minErased) - aggressive = 1; - else { - if(dev->gcSkip > 20) - dev->gcSkip = 20; - if(erasedChunks < dev->nFreeChunks/2 || - dev->gcSkip < 1 || - background) - aggressive = 0; - else { - dev->gcSkip--; - break; - } - } + } - dev->gcSkip = 5; + yaffs_LoadLevel0Tnode(dev, tn, i, 0); + } - /* If we don't already have a block being gc'd then see if we should start another */ + } + return (i < 0) ? 1 : 0; - if (dev->gcBlock < 1 && !aggressive) { - dev->gcBlock = yaffs_FindRefreshBlock(dev); - dev->gcChunk = 0; - } - if (dev->gcBlock < 1) { - dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive, background); - dev->gcChunk = 0; } - if (dev->gcBlock > 0) { - dev->allGCs++; - if (!aggressive) - dev->passiveGCs++; - - T(YAFFS_TRACE_GC, - (TSTR - ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR), - dev->nErasedBlocks, aggressive)); - - gcOk = yaffs_GarbageCollectBlock(dev, dev->gcBlock, aggressive); - } + } - if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && dev->gcBlock > 0) { - T(YAFFS_TRACE_GC, - (TSTR - ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d" - TENDSTR), dev->nErasedBlocks, maxTries, dev->gcBlock)); - } - } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) && - (dev->gcBlock > 0) && - (maxTries < 2)); + return 1; - return aggressive ? gcOk : YAFFS_OK; } -/* - * yaffs_BackgroundGarbageCollect() - * Garbage collects. Intended to be called from a background thread. - * Returns non-zero if at least half the free chunks are erased. - */ -int yaffs_BackgroundGarbageCollect(yaffs_Device *dev, unsigned urgency) +#endif + +static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk) { - int erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock; + yaffs_BlockInfo *theBlock; + unsigned blockNo; - T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency)); + T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk)); - yaffs_CheckGarbageCollection(dev, 1); - return erasedChunks > dev->nFreeChunks/2; + blockNo = chunk / dev->param.nChunksPerBlock; + theBlock = yaffs_GetBlockInfo(dev, blockNo); + if (theBlock) { + theBlock->softDeletions++; + dev->nFreeChunks++; + yaffs2_UpdateOldestDirtySequence(dev, blockNo, theBlock); + } } -/*------------------------- TAGS --------------------------------*/ +/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file. + * All soft deleting does is increment the block's softdelete count and pulls the chunk out + * of the tnode. + * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted. + */ -static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, - int chunkInObject) +static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, + __u32 level, int chunkOffset) { - return (tags->chunkId == chunkInObject && - tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0; + int i; + int theChunk; + int allDone = 1; + yaffs_Device *dev = in->myDev; -} + if (tn) { + if (level > 0) { + for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0; + i--) { + if (tn->internal[i]) { + allDone = + yaffs_SoftDeleteWorker(in, + tn-> + internal[i], + level - 1, + (chunkOffset + << + YAFFS_TNODES_INTERNAL_BITS) + + i); + if (allDone) { + yaffs_FreeTnode(dev, + tn-> + internal[i]); + tn->internal[i] = NULL; + } else { + /* Hoosterman... how could this happen? */ + } + } + } + return (allDone) ? 1 : 0; + } else if (level == 0) { -/*-------------------- Data file manipulation -----------------*/ + for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) { + theChunk = yaffs_GetChunkGroupBase(dev, tn, i); + if (theChunk) { + /* Note this does not find the real chunk, only the chunk group. + * We make an assumption that a chunk group is not larger than + * a block. + */ + yaffs_SoftDeleteChunk(dev, theChunk); + yaffs_LoadLevel0Tnode(dev, tn, i, 0); + } -static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode, - yaffs_ExtendedTags *tags) -{ - /*Get the Tnode, then get the level 0 offset chunk offset */ - yaffs_Tnode *tn; - int theChunk = -1; - yaffs_ExtendedTags localTags; - int retVal = -1; + } + return 1; - yaffs_Device *dev = in->myDev; + } - if (!tags) { - /* Passed a NULL, so use our own tags space */ - tags = &localTags; } - tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode); + return 1; - if (tn) { - theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode); +} - retVal = - yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId, - chunkInInode); +static void yaffs_SoftDeleteFile(yaffs_Object *obj) +{ + if (obj->deleted && + obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) { + if (obj->nDataChunks <= 0) { + /* Empty file with no duplicate object headers, just delete it immediately */ + yaffs_FreeTnode(obj->myDev, + obj->variant.fileVariant.top); + obj->variant.fileVariant.top = NULL; + T(YAFFS_TRACE_TRACING, + (TSTR("yaffs: Deleting empty file %d" TENDSTR), + obj->objectId)); + yaffs_DoGenericObjectDeletion(obj); + } else { + yaffs_SoftDeleteWorker(obj, + obj->variant.fileVariant.top, + obj->variant.fileVariant. + topLevel, 0); + obj->softDeleted = 1; + } } - return retVal; } -static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode, - yaffs_ExtendedTags *tags) +/* Pruning removes any part of the file structure tree that is beyond the + * bounds of the file (ie that does not point to chunks). + * + * A file should only get pruned when its size is reduced. + * + * Before pruning, the chunks must be pulled from the tree and the + * level 0 tnode entries must be zeroed out. + * Could also use this for file deletion, but that's probably better handled + * by a special case. + * + * This function is recursive. For levels > 0 the function is called again on + * any sub-tree. For level == 0 we just check if the sub-tree has data. + * If there is no data in a subtree then it is pruned. + */ + +static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, + __u32 level, int del0) { - /* Get the Tnode, then get the level 0 offset chunk offset */ - yaffs_Tnode *tn; - int theChunk = -1; - yaffs_ExtendedTags localTags; + int i; + int hasData; - yaffs_Device *dev = in->myDev; - int retVal = -1; + if (tn) { + hasData = 0; - if (!tags) { - /* Passed a NULL, so use our own tags space */ - tags = &localTags; - } + if(level > 0){ + for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { + if (tn->internal[i]) { + tn->internal[i] = + yaffs_PruneWorker(dev, tn->internal[i], + level - 1, + (i == 0) ? del0 : 1); + } - tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode); + if (tn->internal[i]) + hasData++; + } + } else { + int tnodeSize_u32 = dev->tnodeSize/sizeof(__u32); + __u32 *map = (__u32 *)tn; - if (tn) { + for(i = 0; !hasData && i < tnodeSize_u32; i++){ + if(map[i]) + hasData++; + } + } - theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode); + if (hasData == 0 && del0) { + /* Free and return NULL */ - retVal = - yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId, - chunkInInode); + yaffs_FreeTnode(dev, tn); + tn = NULL; + } - /* Delete the entry in the filestructure (if found) */ - if (retVal != -1) - yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0); } - return retVal; -} + return tn; -#ifdef YAFFS_PARANOID +} -static int yaffs_CheckFileSanity(yaffs_Object *in) +static int yaffs_PruneFileStructure(yaffs_Device *dev, + yaffs_FileStructure *fStruct) { - int chunk; - int nChunks; - int fSize; - int failed = 0; - int objId; + int i; + int hasData; + int done = 0; yaffs_Tnode *tn; - yaffs_Tags localTags; - yaffs_Tags *tags = &localTags; - int theChunk; - int chunkDeleted; - - if (in->variantType != YAFFS_OBJECT_TYPE_FILE) - return YAFFS_FAIL; - - objId = in->objectId; - fSize = in->variant.fileVariant.fileSize; - nChunks = - (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk; - - for (chunk = 1; chunk <= nChunks; chunk++) { - tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant, - chunk); - if (tn) { + if (fStruct->topLevel > 0) { + fStruct->top = + yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0); - theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk); + /* Now we have a tree with all the non-zero branches NULL but the height + * is the same as it was. + * Let's see if we can trim internal tnodes to shorten the tree. + * We can do this if only the 0th element in the tnode is in use + * (ie all the non-zero are NULL) + */ - if (yaffs_CheckChunkBits - (dev, theChunk / dev->param.nChunksPerBlock, - theChunk % dev->param.nChunksPerBlock)) { + while (fStruct->topLevel && !done) { + tn = fStruct->top; - yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk, - tags, - &chunkDeleted); - if (yaffs_TagsMatch - (tags, in->objectId, chunk, chunkDeleted)) { - /* found it; */ + hasData = 0; + for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) { + if (tn->internal[i]) + hasData++; + } - } + if (!hasData) { + fStruct->top = tn->internal[0]; + fStruct->topLevel--; + yaffs_FreeTnode(dev, tn); } else { - - failed = 1; + done = 1; } - - } else { - /* T(("No level 0 found for %d\n", chunk)); */ } } - return failed ? YAFFS_FAIL : YAFFS_OK; + return YAFFS_OK; } -#endif - -static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode, - int chunkInNAND, int inScan) -{ - /* NB inScan is zero unless scanning. - * For forward scanning, inScan is > 0; - * for backward scanning inScan is < 0 - * - * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there. - */ - - yaffs_Tnode *tn; - yaffs_Device *dev = in->myDev; - int existingChunk; - yaffs_ExtendedTags existingTags; - yaffs_ExtendedTags newTags; - unsigned existingSerial, newSerial; - - if (in->variantType != YAFFS_OBJECT_TYPE_FILE) { - /* Just ignore an attempt at putting a chunk into a non-file during scanning - * If it is not during Scanning then something went wrong! - */ - if (!inScan) { - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs tragedy:attempt to put data chunk into a non-file" - TENDSTR))); - YBUG(); - } +/*-------------------- End of File Structure functions.-------------------*/ - yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__); - return YAFFS_OK; - } - tn = yaffs_AddOrFindLevel0Tnode(dev, - &in->variant.fileVariant, - chunkInInode, - NULL); - if (!tn) - return YAFFS_FAIL; - - if(!chunkInNAND) - /* Dummy insert, bail now */ - return YAFFS_OK; +/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */ +static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev) +{ + yaffs_Object *obj = yaffs_AllocateRawObject(dev); - existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode); + if (obj) { + dev->nObjects++; - if (inScan != 0) { - /* If we're scanning then we need to test for duplicates - * NB This does not need to be efficient since it should only ever - * happen when the power fails during a write, then only one - * chunk should ever be affected. - * - * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO - * Update: For backward scanning we don't need to re-read tags so this is quite cheap. - */ + /* Now sweeten it up... */ - if (existingChunk > 0) { - /* NB Right now existing chunk will not be real chunkId if the device >= 32MB - * thus we have to do a FindChunkInFile to get the real chunk id. - * - * We have a duplicate now we need to decide which one to use: - * - * Backwards scanning YAFFS2: The old one is what we use, dump the new one. - * Forward scanning YAFFS2: The new one is what we use, dump the old one. - * YAFFS1: Get both sets of tags and compare serial numbers. - */ + memset(obj, 0, sizeof(yaffs_Object)); + obj->beingCreated = 1; - if (inScan > 0) { - /* Only do this for forward scanning */ - yaffs_ReadChunkWithTagsFromNAND(dev, - chunkInNAND, - NULL, &newTags); + obj->myDev = dev; + obj->hdrChunk = 0; + obj->variantType = YAFFS_OBJECT_TYPE_UNKNOWN; + YINIT_LIST_HEAD(&(obj->hardLinks)); + YINIT_LIST_HEAD(&(obj->hashLink)); + YINIT_LIST_HEAD(&obj->siblings); - /* Do a proper find */ - existingChunk = - yaffs_FindChunkInFile(in, chunkInInode, - &existingTags); - } - if (existingChunk <= 0) { - /*Hoosterman - how did this happen? */ + /* Now make the directory sane */ + if (dev->rootDir) { + obj->parent = dev->rootDir; + ylist_add(&(obj->siblings), &dev->rootDir->variant.directoryVariant.children); + } - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs tragedy: existing chunk < 0 in scan" - TENDSTR))); + /* Add it to the lost and found directory. + * NB Can't put root or lostNFound in lostNFound so + * check if lostNFound exists first + */ + if (dev->lostNFoundDir) + yaffs_AddObjectToDirectory(dev->lostNFoundDir, obj); - } + obj->beingCreated = 0; + } - /* NB The deleted flags should be false, otherwise the chunks will - * not be loaded during a scan - */ + dev->nCheckpointBlocksRequired = 0; /* force recalculation*/ - if (inScan > 0) { - newSerial = newTags.serialNumber; - existingSerial = existingTags.serialNumber; - } + return obj; +} - if ((inScan > 0) && - (in->myDev->param.isYaffs2 || - existingChunk <= 0 || - ((existingSerial + 1) & 3) == newSerial)) { - /* Forward scanning. - * Use new - * Delete the old one and drop through to update the tnode - */ - yaffs_DeleteChunk(dev, existingChunk, 1, - __LINE__); - } else { - /* Backward scanning or we want to use the existing one - * Use existing. - * Delete the new one and return early so that the tnode isn't changed - */ - yaffs_DeleteChunk(dev, chunkInNAND, 1, - __LINE__); - return YAFFS_OK; - } - } +static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number, + __u32 mode) +{ + yaffs_Object *obj = + yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY); + if (obj) { + obj->fake = 1; /* it is fake so it might have no NAND presence... */ + obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */ + obj->unlinkAllowed = 0; /* ... or unlink it */ + obj->deleted = 0; + obj->unlinked = 0; + obj->yst_mode = mode; + obj->myDev = dev; + obj->hdrChunk = 0; /* Not a valid chunk. */ } - if (existingChunk == 0) - in->nDataChunks++; - - yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND); + return obj; - return YAFFS_OK; } -static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode, - __u8 *buffer) +static void yaffs_UnhashObject(yaffs_Object *obj) { - int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL); + int bucket; + yaffs_Device *dev = obj->myDev; - if (chunkInNAND >= 0) - return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND, - buffer, NULL); - else { - T(YAFFS_TRACE_NANDACCESS, - (TSTR("Chunk %d not found zero instead" TENDSTR), - chunkInNAND)); - /* get sane (zero) data if you read a hole */ - memset(buffer, 0, in->myDev->nDataBytesPerChunk); - return 0; + /* If it is still linked into the bucket list, free from the list */ + if (!ylist_empty(&obj->hashLink)) { + ylist_del_init(&obj->hashLink); + bucket = yaffs_HashFunction(obj->objectId); + dev->objectBucket[bucket].count--; } - } -void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn) +/* FreeObject frees up a Object and puts it back on the free list */ +static void yaffs_FreeObject(yaffs_Object *obj) { - int block; - int page; - yaffs_ExtendedTags tags; - yaffs_BlockInfo *bi; + yaffs_Device *dev = obj->myDev; - if (chunkId <= 0) - return; + T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->myInode)); - dev->nDeletions++; - block = chunkId / dev->param.nChunksPerBlock; - page = chunkId % dev->param.nChunksPerBlock; + if (!obj) + YBUG(); + if (obj->parent) + YBUG(); + if (!ylist_empty(&obj->siblings)) + YBUG(); - if (!yaffs_CheckChunkBit(dev, block, page)) - T(YAFFS_TRACE_VERIFY, - (TSTR("Deleting invalid chunk %d"TENDSTR), - chunkId)); + if (obj->myInode) { + /* We're still hooked up to a cached inode. + * Don't delete now, but mark for later deletion + */ + obj->deferedFree = 1; + return; + } + + yaffs_UnhashObject(obj); - bi = yaffs_GetBlockInfo(dev, block); - - yaffs_UpdateOldestDirtySequence(dev, block, bi); + yaffs_FreeRawObject(dev,obj); + dev->nObjects--; + dev->nCheckpointBlocksRequired = 0; /* force recalculation*/ +} - T(YAFFS_TRACE_DELETION, - (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId)); - if (markNAND && - bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) { +void yaffs_HandleDeferedFree(yaffs_Object *obj) +{ + if (obj->deferedFree) + yaffs_FreeObject(obj); +} - yaffs_InitialiseTags(&tags); +static void yaffs_InitialiseTnodesAndObjects(yaffs_Device *dev) +{ + int i; - tags.chunkDeleted = 1; + dev->nObjects = 0; + dev->nTnodes = 0; - yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags); - yaffs_HandleUpdateChunk(dev, chunkId, &tags); - } else { - dev->nUnmarkedDeletions++; + yaffs_InitialiseRawTnodesAndObjects(dev); + + for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { + YINIT_LIST_HEAD(&dev->objectBucket[i].list); + dev->objectBucket[i].count = 0; } +} - /* Pull out of the management area. - * If the whole block became dirty, this will kick off an erasure. - */ - if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || - bi->blockState == YAFFS_BLOCK_STATE_FULL || - bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING || - bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) { - dev->nFreeChunks++; +static int yaffs_FindNiceObjectBucket(yaffs_Device *dev) +{ + int i; + int l = 999; + int lowest = 999999; - yaffs_ClearChunkBit(dev, block, page); - bi->pagesInUse--; + /* Search for the shortest list or one that + * isn't too long. + */ - if (bi->pagesInUse == 0 && - !bi->hasShrinkHeader && - bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING && - bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) { - yaffs_BlockBecameDirty(dev, block); + for (i = 0; i < 10 && lowest > 4; i++) { + dev->bucketFinder++; + dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS; + if (dev->objectBucket[dev->bucketFinder].count < lowest) { + lowest = dev->objectBucket[dev->bucketFinder].count; + l = dev->bucketFinder; } } + return l; } -static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode, - const __u8 *buffer, int nBytes, - int useReserve) +static int yaffs_CreateNewObjectNumber(yaffs_Device *dev) { - /* Find old chunk Need to do this to get serial number - * Write new one and patch into tree. - * Invalidate old tags. - */ - - int prevChunkId; - yaffs_ExtendedTags prevTags; - - int newChunkId; - yaffs_ExtendedTags newTags; - - yaffs_Device *dev = in->myDev; - - yaffs_CheckGarbageCollection(dev,0); + int bucket = yaffs_FindNiceObjectBucket(dev); - /* Get the previous chunk at this location in the file if it exists. - * If it does not exist then put a zero into the tree. This creates - * the tnode now, rather than later when it is harder to clean up. + /* Now find an object value that has not already been taken + * by scanning the list. */ - prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags); - if(prevChunkId < 1 && - !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0)) - return 0; - - /* Set up new tags */ - yaffs_InitialiseTags(&newTags); - - newTags.chunkId = chunkInInode; - newTags.objectId = in->objectId; - newTags.serialNumber = - (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1; - newTags.byteCount = nBytes; - if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) { - T(YAFFS_TRACE_ERROR, - (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes)); - YBUG(); - } - - - newChunkId = - yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags, - useReserve); + int found = 0; + struct ylist_head *i; - if (newChunkId > 0) { - yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0); + __u32 n = (__u32) bucket; - if (prevChunkId > 0) - yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__); + /* yaffs_CheckObjectHashSanity(); */ - yaffs_CheckFileSanity(in); + while (!found) { + found = 1; + n += YAFFS_NOBJECT_BUCKETS; + if (1 || dev->objectBucket[bucket].count > 0) { + ylist_for_each(i, &dev->objectBucket[bucket].list) { + /* If there is already one in the list */ + if (i && ylist_entry(i, yaffs_Object, + hashLink)->objectId == n) { + found = 0; + } + } + } } - return newChunkId; + return n; } -/* UpdateObjectHeader updates the header on NAND for an object. - * If name is not NULL, then that new name is used. - */ -int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force, - int isShrink, int shadows, yaffs_XAttrMod *xmod) +static void yaffs_HashObject(yaffs_Object *in) { - - yaffs_BlockInfo *bi; - + int bucket = yaffs_HashFunction(in->objectId); yaffs_Device *dev = in->myDev; - int prevChunkId; - int retVal = 0; - int result = 0; - - int newChunkId; - yaffs_ExtendedTags newTags; - yaffs_ExtendedTags oldTags; - YCHAR *alias = NULL; - - __u8 *buffer = NULL; - YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1]; - - yaffs_ObjectHeader *oh = NULL; + ylist_add(&in->hashLink, &dev->objectBucket[bucket].list); + dev->objectBucket[bucket].count++; +} - yaffs_strcpy(oldName, _Y("silly old name")); +yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number) +{ + int bucket = yaffs_HashFunction(number); + struct ylist_head *i; + yaffs_Object *in; + ylist_for_each(i, &dev->objectBucket[bucket].list) { + /* Look if it is in the list */ + if (i) { + in = ylist_entry(i, yaffs_Object, hashLink); + if (in->objectId == number) { - if (!in->fake || - in == dev->rootDir || /* The rootDir should also be saved */ - force || xmod) { + /* Don't tell the VFS about this one if it is defered free */ + if (in->deferedFree) + return NULL; - yaffs_CheckGarbageCollection(dev,0); - yaffs_CheckObjectDetailsLoaded(in); + return in; + } + } + } - buffer = yaffs_GetTempBuffer(in->myDev, __LINE__); - oh = (yaffs_ObjectHeader *) buffer; + return NULL; +} - prevChunkId = in->hdrChunk; +yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number, + yaffs_ObjectType type) +{ + yaffs_Object *theObject=NULL; + yaffs_Tnode *tn = NULL; - if (prevChunkId > 0) { - result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId, - buffer, &oldTags); + if (number < 0) + number = yaffs_CreateNewObjectNumber(dev); - yaffs_VerifyObjectHeader(in, oh, &oldTags, 0); + if (type == YAFFS_OBJECT_TYPE_FILE) { + tn = yaffs_GetTnode(dev); + if (!tn) + return NULL; + } - memcpy(oldName, oh->name, sizeof(oh->name)); - memset(buffer, 0xFF, sizeof(yaffs_ObjectHeader)); - } else - memset(buffer, 0xFF, dev->nDataBytesPerChunk); + theObject = yaffs_AllocateEmptyObject(dev); + if (!theObject){ + if(tn) + yaffs_FreeTnode(dev,tn); + return NULL; + } - oh->type = in->variantType; - oh->yst_mode = in->yst_mode; - oh->shadowsObject = oh->inbandShadowsObject = shadows; + if (theObject) { + theObject->fake = 0; + theObject->renameAllowed = 1; + theObject->unlinkAllowed = 1; + theObject->objectId = number; + yaffs_HashObject(theObject); + theObject->variantType = type; #ifdef CONFIG_YAFFS_WINCE - oh->win_atime[0] = in->win_atime[0]; - oh->win_ctime[0] = in->win_ctime[0]; - oh->win_mtime[0] = in->win_mtime[0]; - oh->win_atime[1] = in->win_atime[1]; - oh->win_ctime[1] = in->win_ctime[1]; - oh->win_mtime[1] = in->win_mtime[1]; -#else - oh->yst_uid = in->yst_uid; - oh->yst_gid = in->yst_gid; - oh->yst_atime = in->yst_atime; - oh->yst_mtime = in->yst_mtime; - oh->yst_ctime = in->yst_ctime; - oh->yst_rdev = in->yst_rdev; -#endif - if (in->parent) - oh->parentObjectId = in->parent->objectId; - else - oh->parentObjectId = 0; - - if (name && *name) { - memset(oh->name, 0, sizeof(oh->name)); - yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH); - } else if (prevChunkId > 0) - memcpy(oh->name, oldName, sizeof(oh->name)); - else - memset(oh->name, 0, sizeof(oh->name)); + yfsd_WinFileTimeNow(theObject->win_atime); + theObject->win_ctime[0] = theObject->win_mtime[0] = + theObject->win_atime[0]; + theObject->win_ctime[1] = theObject->win_mtime[1] = + theObject->win_atime[1]; - oh->isShrink = isShrink; +#else - switch (in->variantType) { - case YAFFS_OBJECT_TYPE_UNKNOWN: - /* Should not happen */ - break; + theObject->yst_atime = theObject->yst_mtime = + theObject->yst_ctime = Y_CURRENT_TIME; +#endif + switch (type) { case YAFFS_OBJECT_TYPE_FILE: - oh->fileSize = - (oh->parentObjectId == YAFFS_OBJECTID_DELETED - || oh->parentObjectId == - YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant. - fileVariant.fileSize; - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - oh->equivalentObjectId = - in->variant.hardLinkVariant.equivalentObjectId; - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - /* Do nothing */ + theObject->variant.fileVariant.fileSize = 0; + theObject->variant.fileVariant.scannedFileSize = 0; + theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */ + theObject->variant.fileVariant.topLevel = 0; + theObject->variant.fileVariant.top = tn; break; case YAFFS_OBJECT_TYPE_DIRECTORY: - /* Do nothing */ + YINIT_LIST_HEAD(&theObject->variant.directoryVariant. + children); + YINIT_LIST_HEAD(&theObject->variant.directoryVariant. + dirty); break; case YAFFS_OBJECT_TYPE_SYMLINK: - alias = in->variant.symLinkVariant.alias; - if(!alias) - alias = _Y("no alias"); - yaffs_strncpy(oh->alias, - alias, - YAFFS_MAX_ALIAS_LENGTH); - oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_SPECIAL: + /* No action required */ + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* todo this should not happen */ break; } + } - /* process any xattrib modifications */ - if(xmod) - yaffs_ApplyXMod(dev, (char *)buffer, xmod); - - - /* Tags */ - yaffs_InitialiseTags(&newTags); - in->serial++; - newTags.chunkId = 0; - newTags.objectId = in->objectId; - newTags.serialNumber = in->serial; - - /* Add extra info for file header */ - - newTags.extraHeaderInfoAvailable = 1; - newTags.extraParentObjectId = oh->parentObjectId; - newTags.extraFileLength = oh->fileSize; - newTags.extraIsShrinkHeader = oh->isShrink; - newTags.extraEquivalentObjectId = oh->equivalentObjectId; - newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0; - newTags.extraObjectType = in->variantType; - - yaffs_VerifyObjectHeader(in, oh, &newTags, 1); + return theObject; +} - /* Create new chunk in NAND */ - newChunkId = - yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags, - (prevChunkId > 0) ? 1 : 0); +yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, + int number, + yaffs_ObjectType type) +{ + yaffs_Object *theObject = NULL; - if (newChunkId >= 0) { + if (number > 0) + theObject = yaffs_FindObjectByNumber(dev, number); - in->hdrChunk = newChunkId; + if (!theObject) + theObject = yaffs_CreateNewObject(dev, number, type); - if (prevChunkId > 0) { - yaffs_DeleteChunk(dev, prevChunkId, 1, - __LINE__); - } + return theObject; - if (!yaffs_ObjectHasCachedWriteData(in)) - in->dirty = 0; +} - /* If this was a shrink, then mark the block that the chunk lives on */ - if (isShrink) { - bi = yaffs_GetBlockInfo(in->myDev, - newChunkId / in->myDev->param.nChunksPerBlock); - bi->hasShrinkHeader = 1; - } - } +YCHAR *yaffs_CloneString(const YCHAR *str) +{ + YCHAR *newStr = NULL; + int len; - retVal = newChunkId; + if (!str) + str = _Y(""); + len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH); + newStr = YMALLOC((len + 1) * sizeof(YCHAR)); + if (newStr){ + yaffs_strncpy(newStr, str,len); + newStr[len] = 0; } + return newStr; - if (buffer) - yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); - - return retVal; } -/*------------------------ Short Operations Cache ---------------------------------------- - * In many situations where there is no high level buffering (eg WinCE) a lot of - * reads might be short sequential reads, and a lot of writes may be short - * sequential writes. eg. scanning/writing a jpeg file. - * In these cases, a short read/write cache can provide a huge perfomance benefit - * with dumb-as-a-rock code. - * In Linux, the page cache provides read buffering aand the short op cache provides write - * buffering. - * - * There are a limited number (~10) of cache chunks per device so that we don't - * need a very intelligent search. +/* + * Mknod (create) a new object. + * equivalentObject only has meaning for a hard link; + * aliasString only has meaning for a symlink. + * rdev only has meaning for devices (a subset of special objects) */ -static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj) +static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type, + yaffs_Object *parent, + const YCHAR *name, + __u32 mode, + __u32 uid, + __u32 gid, + yaffs_Object *equivalentObject, + const YCHAR *aliasString, __u32 rdev) { - yaffs_Device *dev = obj->myDev; - int i; - yaffs_ChunkCache *cache; - int nCaches = obj->myDev->param.nShortOpCaches; + yaffs_Object *in; + YCHAR *str = NULL; - for (i = 0; i < nCaches; i++) { - cache = &dev->srCache[i]; - if (cache->object == obj && - cache->dirty) - return 1; + yaffs_Device *dev = parent->myDev; + + /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/ + if (yaffs_FindObjectByName(parent, name)) + return NULL; + + if (type == YAFFS_OBJECT_TYPE_SYMLINK) { + str = yaffs_CloneString(aliasString); + if (!str) + return NULL; } - return 0; -} + in = yaffs_CreateNewObject(dev, -1, type); + if (!in){ + if(str) + YFREE(str); + return NULL; + } -static void yaffs_FlushFilesChunkCache(yaffs_Object *obj) -{ - yaffs_Device *dev = obj->myDev; - int lowest = -99; /* Stop compiler whining. */ - int i; - yaffs_ChunkCache *cache; - int chunkWritten = 0; - int nCaches = obj->myDev->param.nShortOpCaches; - if (nCaches > 0) { - do { - cache = NULL; - /* Find the dirty cache for this object with the lowest chunk id. */ - for (i = 0; i < nCaches; i++) { - if (dev->srCache[i].object == obj && - dev->srCache[i].dirty) { - if (!cache - || dev->srCache[i].chunkId < - lowest) { - cache = &dev->srCache[i]; - lowest = cache->chunkId; - } - } - } - if (cache && !cache->locked) { - /* Write it out and free it up */ - chunkWritten = - yaffs_WriteChunkDataToObject(cache->object, - cache->chunkId, - cache->data, - cache->nBytes, - 1); - cache->dirty = 0; - cache->object = NULL; - } + if (in) { + in->hdrChunk = 0; + in->valid = 1; + in->variantType = type; - } while (cache && chunkWritten > 0); + in->yst_mode = mode; - if (cache) { - /* Hoosterman, disk full while writing cache out. */ - T(YAFFS_TRACE_ERROR, - (TSTR("yaffs tragedy: no space during cache write" TENDSTR))); +#ifdef CONFIG_YAFFS_WINCE + yfsd_WinFileTimeNow(in->win_atime); + in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0]; + in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1]; - } - } +#else + in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME; -} + in->yst_rdev = rdev; + in->yst_uid = uid; + in->yst_gid = gid; +#endif + in->nDataChunks = 0; -/*yaffs_FlushEntireDeviceCache(dev) - * - * - */ + yaffs_SetObjectName(in, name); + in->dirty = 1; -void yaffs_FlushEntireDeviceCache(yaffs_Device *dev) -{ - yaffs_Object *obj; - int nCaches = dev->param.nShortOpCaches; - int i; + yaffs_AddObjectToDirectory(parent, in); - /* Find a dirty object in the cache and flush it... - * until there are no further dirty objects. - */ - do { - obj = NULL; - for (i = 0; i < nCaches && !obj; i++) { - if (dev->srCache[i].object && - dev->srCache[i].dirty) - obj = dev->srCache[i].object; + in->myDev = parent->myDev; + + switch (type) { + case YAFFS_OBJECT_TYPE_SYMLINK: + in->variant.symLinkVariant.alias = str; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant.hardLinkVariant.equivalentObject = + equivalentObject; + in->variant.hardLinkVariant.equivalentObjectId = + equivalentObject->objectId; + ylist_add(&in->hardLinks, &equivalentObject->hardLinks); + break; + case YAFFS_OBJECT_TYPE_FILE: + case YAFFS_OBJECT_TYPE_DIRECTORY: + case YAFFS_OBJECT_TYPE_SPECIAL: + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* do nothing */ + break; + } + if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0, NULL) < 0) { + /* Could not create the object header, fail the creation */ + yaffs_DeleteObject(in); + in = NULL; } - if (obj) - yaffs_FlushFilesChunkCache(obj); - } while (obj); + yaffs_UpdateParent(parent); + } + return in; } - -/* Grab us a cache chunk for use. - * First look for an empty one. - * Then look for the least recently used non-dirty one. - * Then look for the least recently used dirty one...., flush and look again. - */ -static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev) +yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name, + __u32 mode, __u32 uid, __u32 gid) { - int i; - - if (dev->param.nShortOpCaches > 0) { - for (i = 0; i < dev->param.nShortOpCaches; i++) { - if (!dev->srCache[i].object) - return &dev->srCache[i]; - } - } - - return NULL; + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode, + uid, gid, NULL, NULL, 0); } -static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev) +yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name, + __u32 mode, __u32 uid, __u32 gid) { - yaffs_ChunkCache *cache; - yaffs_Object *theObj; - int usage; - int i; - int pushout; - - if (dev->param.nShortOpCaches > 0) { - /* Try find a non-dirty one... */ - - cache = yaffs_GrabChunkCacheWorker(dev); - - if (!cache) { - /* They were all dirty, find the last recently used object and flush - * its cache, then find again. - * NB what's here is not very accurate, we actually flush the object - * the last recently used page. - */ - - /* With locking we can't assume we can use entry zero */ - - theObj = NULL; - usage = -1; - cache = NULL; - pushout = -1; - - for (i = 0; i < dev->param.nShortOpCaches; i++) { - if (dev->srCache[i].object && - !dev->srCache[i].locked && - (dev->srCache[i].lastUse < usage || !cache)) { - usage = dev->srCache[i].lastUse; - theObj = dev->srCache[i].object; - cache = &dev->srCache[i]; - pushout = i; - } - } - - if (!cache || cache->dirty) { - /* Flush and try again */ - yaffs_FlushFilesChunkCache(theObj); - cache = yaffs_GrabChunkCacheWorker(dev); - } + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name, + mode, uid, gid, NULL, NULL, 0); +} - } - return cache; - } else - return NULL; +yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name, + __u32 mode, __u32 uid, __u32 gid, __u32 rdev) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode, + uid, gid, NULL, NULL, rdev); +} +yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name, + __u32 mode, __u32 uid, __u32 gid, + const YCHAR *alias) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode, + uid, gid, NULL, alias, 0); } -/* Find a cached chunk */ -static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, - int chunkId) +/* yaffs_Link returns the object id of the equivalent object.*/ +yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, + yaffs_Object *equivalentObject) { - yaffs_Device *dev = obj->myDev; - int i; - if (dev->param.nShortOpCaches > 0) { - for (i = 0; i < dev->param.nShortOpCaches; i++) { - if (dev->srCache[i].object == obj && - dev->srCache[i].chunkId == chunkId) { - dev->cacheHits++; + /* Get the real object in case we were fed a hard link as an equivalent object */ + equivalentObject = yaffs_GetEquivalentObject(equivalentObject); - return &dev->srCache[i]; - } - } + if (yaffs_MknodObject + (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0, + equivalentObject, NULL, 0)) { + return equivalentObject; + } else { + return NULL; } - return NULL; + } -/* Mark the chunk for the least recently used algorithym */ -static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, - int isAWrite) +static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, + const YCHAR *newName, int force, int shadows) { + int unlinkOp; + int deleteOp; - if (dev->param.nShortOpCaches > 0) { - if (dev->srLastUse < 0 || dev->srLastUse > 100000000) { - /* Reset the cache usages */ - int i; - for (i = 1; i < dev->param.nShortOpCaches; i++) - dev->srCache[i].lastUse = 0; + yaffs_Object *existingTarget; - dev->srLastUse = 0; - } + if (newDir == NULL) + newDir = obj->parent; /* use the old directory */ - dev->srLastUse++; + if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: yaffs_ChangeObjectName: newDir is not a directory" + TENDSTR))); + YBUG(); + } - cache->lastUse = dev->srLastUse; + /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */ + if (obj->myDev->param.isYaffs2) + unlinkOp = (newDir == obj->myDev->unlinkedDir); + else + unlinkOp = (newDir == obj->myDev->unlinkedDir + && obj->variantType == YAFFS_OBJECT_TYPE_FILE); - if (isAWrite) - cache->dirty = 1; - } -} + deleteOp = (newDir == obj->myDev->deletedDir); -/* Invalidate a single cache page. - * Do this when a whole page gets written, - * ie the short cache for this page is no longer valid. - */ -static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId) -{ - if (object->myDev->param.nShortOpCaches > 0) { - yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId); + existingTarget = yaffs_FindObjectByName(newDir, newName); - if (cache) - cache->object = NULL; - } -} + /* If the object is a file going into the unlinked directory, + * then it is OK to just stuff it in since duplicate names are allowed. + * else only proceed if the new name does not exist and if we're putting + * it into a directory. + */ + if ((unlinkOp || + deleteOp || + force || + (shadows > 0) || + !existingTarget) && + newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_SetObjectName(obj, newName); + obj->dirty = 1; -/* Invalidate all the cache pages associated with this object - * Do this whenever ther file is deleted or resized. - */ -static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in) -{ - int i; - yaffs_Device *dev = in->myDev; + yaffs_AddObjectToDirectory(newDir, obj); - if (dev->param.nShortOpCaches > 0) { - /* Invalidate it. */ - for (i = 0; i < dev->param.nShortOpCaches; i++) { - if (dev->srCache[i].object == in) - dev->srCache[i].object = NULL; - } - } -} + if (unlinkOp) + obj->unlinked = 1; -/*--------------------- Checkpointing --------------------*/ + /* If it is a deletion then we mark it as a shrink for gc purposes. */ + if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows, NULL) >= 0) + return YAFFS_OK; + } + return YAFFS_FAIL; +} -static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head) +int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, + yaffs_Object *newDir, const YCHAR *newName) { - yaffs_CheckpointValidity cp; + yaffs_Object *obj = NULL; + yaffs_Object *existingTarget = NULL; + int force = 0; + int result; + yaffs_Device *dev; - memset(&cp, 0, sizeof(cp)); - cp.structType = sizeof(cp); - cp.magic = YAFFS_MAGIC; - cp.version = YAFFS_CHECKPOINT_VERSION; - cp.head = (head) ? 1 : 0; + if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) + YBUG(); + if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) + YBUG(); - return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ? - 1 : 0; -} + dev = oldDir->myDev; -static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head) -{ - yaffs_CheckpointValidity cp; - int ok; +#ifdef CONFIG_YAFFS_CASE_INSENSITIVE + /* Special case for case insemsitive systems (eg. WinCE). + * While look-up is case insensitive, the name isn't. + * Therefore we might want to change x.txt to X.txt + */ + if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) + force = 1; +#endif - ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp)); + if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH) + /* ENAMETOOLONG */ + return YAFFS_FAIL; - if (ok) - ok = (cp.structType == sizeof(cp)) && - (cp.magic == YAFFS_MAGIC) && - (cp.version == YAFFS_CHECKPOINT_VERSION) && - (cp.head == ((head) ? 1 : 0)); - return ok ? 1 : 0; -} + obj = yaffs_FindObjectByName(oldDir, oldName); -static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp, - yaffs_Device *dev) -{ - cp->nErasedBlocks = dev->nErasedBlocks; - cp->allocationBlock = dev->allocationBlock; - cp->allocationPage = dev->allocationPage; - cp->nFreeChunks = dev->nFreeChunks; + if (obj && obj->renameAllowed) { - cp->nDeletedFiles = dev->nDeletedFiles; - cp->nUnlinkedFiles = dev->nUnlinkedFiles; - cp->nBackgroundDeletions = dev->nBackgroundDeletions; - cp->sequenceNumber = dev->sequenceNumber; + /* Now do the handling for an existing target, if there is one */ -} + existingTarget = yaffs_FindObjectByName(newDir, newName); + if (existingTarget && + existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY && + !ylist_empty(&existingTarget->variant.directoryVariant.children)) { + /* There is a target that is a non-empty directory, so we fail */ + return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */ + } else if (existingTarget && existingTarget != obj) { + /* Nuke the target first, using shadowing, + * but only if it isn't the same object. + * + * Note we must disable gc otherwise it can mess up the shadowing. + * + */ + dev->gcDisable=1; + yaffs_ChangeObjectName(obj, newDir, newName, force, + existingTarget->objectId); + existingTarget->isShadowed = 1; + yaffs_UnlinkObject(existingTarget); + dev->gcDisable=0; + } -static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev, - yaffs_CheckpointDevice *cp) -{ - dev->nErasedBlocks = cp->nErasedBlocks; - dev->allocationBlock = cp->allocationBlock; - dev->allocationPage = cp->allocationPage; - dev->nFreeChunks = cp->nFreeChunks; + result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0); - dev->nDeletedFiles = cp->nDeletedFiles; - dev->nUnlinkedFiles = cp->nUnlinkedFiles; - dev->nBackgroundDeletions = cp->nBackgroundDeletions; - dev->sequenceNumber = cp->sequenceNumber; + yaffs_UpdateParent(oldDir); + if(newDir != oldDir) + yaffs_UpdateParent(newDir); + + return result; + } + return YAFFS_FAIL; } +/*------------------------- Block Management and Page Allocation ----------------*/ -static int yaffs_WriteCheckpointDevice(yaffs_Device *dev) +static int yaffs_InitialiseBlocks(yaffs_Device *dev) { - yaffs_CheckpointDevice cp; - __u32 nBytes; - __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1); + int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1; - int ok; + dev->blockInfo = NULL; + dev->chunkBits = NULL; - /* Write device runtime values*/ - yaffs_DeviceToCheckpointDevice(&cp, dev); - cp.structType = sizeof(cp); + dev->allocationBlock = -1; /* force it to get a new one */ - ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)); + /* If the first allocation strategy fails, thry the alternate one */ + dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo)); + if (!dev->blockInfo) { + dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo)); + dev->blockInfoAlt = 1; + } else + dev->blockInfoAlt = 0; - /* Write block info */ - if (ok) { - nBytes = nBlocks * sizeof(yaffs_BlockInfo); - ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes); + if (dev->blockInfo) { + /* Set up dynamic blockinfo stuff. */ + dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */ + dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks); + if (!dev->chunkBits) { + dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks); + dev->chunkBitsAlt = 1; + } else + dev->chunkBitsAlt = 0; } - /* Write chunk bits */ - if (ok) { - nBytes = nBlocks * dev->chunkBitmapStride; - ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes); + if (dev->blockInfo && dev->chunkBits) { + memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo)); + memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks); + return YAFFS_OK; } - return ok ? 1 : 0; + return YAFFS_FAIL; } -static int yaffs_ReadCheckpointDevice(yaffs_Device *dev) +static void yaffs_DeinitialiseBlocks(yaffs_Device *dev) { - yaffs_CheckpointDevice cp; - __u32 nBytes; - __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1); - - int ok; - - ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp)); - if (!ok) - return 0; - - if (cp.structType != sizeof(cp)) - return 0; - - - yaffs_CheckpointDeviceToDevice(dev, &cp); - - nBytes = nBlocks * sizeof(yaffs_BlockInfo); - - ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes); + if (dev->blockInfoAlt && dev->blockInfo) + YFREE_ALT(dev->blockInfo); + else if (dev->blockInfo) + YFREE(dev->blockInfo); - if (!ok) - return 0; - nBytes = nBlocks * dev->chunkBitmapStride; + dev->blockInfoAlt = 0; - ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes); + dev->blockInfo = NULL; - return ok ? 1 : 0; + if (dev->chunkBitsAlt && dev->chunkBits) + YFREE_ALT(dev->chunkBits); + else if (dev->chunkBits) + YFREE(dev->chunkBits); + dev->chunkBitsAlt = 0; + dev->chunkBits = NULL; } -static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp, - yaffs_Object *obj) +void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo) { + yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo); - cp->objectId = obj->objectId; - cp->parentId = (obj->parent) ? obj->parent->objectId : 0; - cp->hdrChunk = obj->hdrChunk; - cp->variantType = obj->variantType; - cp->deleted = obj->deleted; - cp->softDeleted = obj->softDeleted; - cp->unlinked = obj->unlinked; - cp->fake = obj->fake; - cp->renameAllowed = obj->renameAllowed; - cp->unlinkAllowed = obj->unlinkAllowed; - cp->serial = obj->serial; - cp->nDataChunks = obj->nDataChunks; + int erasedOk = 0; - if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) - cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize; - else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) - cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId; -} + /* If the block is still healthy erase it and mark as clean. + * If the block has had a data failure, then retire it. + */ -static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp) -{ + T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE, + (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR), + blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : "")); - yaffs_Object *parent; + yaffs2_ClearOldestDirtySequence(dev,bi); - if (obj->variantType != cp->variantType) { - T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d " - TCONT("chunk %d does not match existing object type %d") - TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk, - obj->variantType)); - return 0; - } + bi->blockState = YAFFS_BLOCK_STATE_DIRTY; - obj->objectId = cp->objectId; + /* If this is the block being garbage collected then stop gc'ing this block */ + if(blockNo == dev->gcBlock) + dev->gcBlock = 0; - if (cp->parentId) - parent = yaffs_FindOrCreateObjectByNumber( - obj->myDev, - cp->parentId, - YAFFS_OBJECT_TYPE_DIRECTORY); - else - parent = NULL; - - if (parent) { - if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { - T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d" - TCONT(" chunk %d Parent type, %d, not directory") - TENDSTR), - cp->objectId, cp->parentId, cp->variantType, - cp->hdrChunk, parent->variantType)); - return 0; - } - yaffs_AddObjectToDirectory(parent, obj); + /* If this block is currently the best candidate for gc then drop as a candidate */ + if(blockNo == dev->gcDirtiest){ + dev->gcDirtiest = 0; + dev->gcPagesInUse = 0; } - obj->hdrChunk = cp->hdrChunk; - obj->variantType = cp->variantType; - obj->deleted = cp->deleted; - obj->softDeleted = cp->softDeleted; - obj->unlinked = cp->unlinked; - obj->fake = cp->fake; - obj->renameAllowed = cp->renameAllowed; - obj->unlinkAllowed = cp->unlinkAllowed; - obj->serial = cp->serial; - obj->nDataChunks = cp->nDataChunks; - - if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) - obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId; - else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) - obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId; - - if (obj->hdrChunk > 0) - obj->lazyLoaded = 1; - return 1; -} - - - -static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn, - __u32 level, int chunkOffset) -{ - int i; - yaffs_Device *dev = in->myDev; - int ok = 1; - - if (tn) { - if (level > 0) { + if (!bi->needsRetiring) { + yaffs2_InvalidateCheckpoint(dev); + erasedOk = yaffs_EraseBlockInNAND(dev, blockNo); + if (!erasedOk) { + dev->nErasureFailures++; + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Erasure failed %d" TENDSTR), blockNo)); + } + } - for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) { - if (tn->internal[i]) { - ok = yaffs_CheckpointTnodeWorker(in, - tn->internal[i], - level - 1, - (chunkOffset<param.nChunksPerBlock; i++) { + if (!yaffs_CheckChunkErased + (dev, blockNo * dev->param.nChunksPerBlock + i)) { + T(YAFFS_TRACE_ERROR, + (TSTR + (">>Block %d erasure supposedly OK, but chunk %d not erased" + TENDSTR), blockNo, i)); } - } else if (level == 0) { - __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS; - ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset)); - if (ok) - ok = (yaffs_CheckpointWrite(dev, tn, dev->tnodeSize) == dev->tnodeSize); } } - return ok; - -} + if (erasedOk) { + /* Clean it up... */ + bi->blockState = YAFFS_BLOCK_STATE_EMPTY; + bi->sequenceNumber = 0; + dev->nErasedBlocks++; + bi->pagesInUse = 0; + bi->softDeletions = 0; + bi->hasShrinkHeader = 0; + bi->skipErasedCheck = 1; /* This is clean, so no need to check */ + bi->gcPrioritise = 0; + yaffs_ClearChunkBits(dev, blockNo); -static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj) -{ - __u32 endMarker = ~0; - int ok = 1; + T(YAFFS_TRACE_ERASE, + (TSTR("Erased block %d" TENDSTR), blockNo)); + } else { + dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */ - if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) { - ok = yaffs_CheckpointTnodeWorker(obj, - obj->variant.fileVariant.top, - obj->variant.fileVariant.topLevel, - 0); - if (ok) - ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) == - sizeof(endMarker)); + yaffs_RetireBlock(dev, blockNo); + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Block %d retired" TENDSTR), blockNo)); } - - return ok ? 1 : 0; } -static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj) +static int yaffs_FindBlockForAllocation(yaffs_Device *dev) { - __u32 baseChunk; - int ok = 1; - yaffs_Device *dev = obj->myDev; - yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant; - yaffs_Tnode *tn; - int nread = 0; + int i; - ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk)); + yaffs_BlockInfo *bi; - while (ok && (~baseChunk)) { - nread++; - /* Read level 0 tnode */ + if (dev->nErasedBlocks < 1) { + /* Hoosterman we've got a problem. + * Can't get space to gc + */ + T(YAFFS_TRACE_ERROR, + (TSTR("yaffs tragedy: no more erased blocks" TENDSTR))); + return -1; + } - tn = yaffs_GetTnode(dev); - if (tn){ - ok = (yaffs_CheckpointRead(dev, tn, dev->tnodeSize) == dev->tnodeSize); - } else - ok = 0; + /* Find an empty block. */ - if (tn && ok) - ok = yaffs_AddOrFindLevel0Tnode(dev, - fileStructPtr, - baseChunk, - tn) ? 1 : 0; + for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) { + dev->allocationBlockFinder++; + if (dev->allocationBlockFinder < dev->internalStartBlock + || dev->allocationBlockFinder > dev->internalEndBlock) { + dev->allocationBlockFinder = dev->internalStartBlock; + } - if (ok) - ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk)); + bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder); + if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) { + bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING; + dev->sequenceNumber++; + bi->sequenceNumber = dev->sequenceNumber; + dev->nErasedBlocks--; + T(YAFFS_TRACE_ALLOCATE, + (TSTR("Allocated block %d, seq %d, %d left" TENDSTR), + dev->allocationBlockFinder, dev->sequenceNumber, + dev->nErasedBlocks)); + return dev->allocationBlockFinder; + } } - T(YAFFS_TRACE_CHECKPOINT, ( - TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR), - nread, baseChunk, ok)); + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("yaffs tragedy: no more erased blocks, but there should have been %d" + TENDSTR), dev->nErasedBlocks)); - return ok ? 1 : 0; + return -1; } -static int yaffs_WriteCheckpointObjects(yaffs_Device *dev) +/* + * Check if there's space to allocate... + * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()? + */ +int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks) { - yaffs_Object *obj; - yaffs_CheckpointObject cp; - int i; - int ok = 1; - struct ylist_head *lh; - + int reservedChunks; + int reservedBlocks = dev->param.nReservedBlocks; + int checkpointBlocks; - /* Iterate through the objects in each hash entry, - * dumping them to the checkpointing stream. - */ + checkpointBlocks = yaffs2_CalcCheckpointBlocksRequired(dev); - for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) { - ylist_for_each(lh, &dev->objectBucket[i].list) { - if (lh) { - obj = ylist_entry(lh, yaffs_Object, hashLink); - if (!obj->deferedFree) { - yaffs_ObjectToCheckpointObject(&cp, obj); - cp.structType = sizeof(cp); + reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock); - T(YAFFS_TRACE_CHECKPOINT, ( - TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR), - cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj)); + return (dev->nFreeChunks > (reservedChunks + nChunks)); +} - ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)); +static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve, + yaffs_BlockInfo **blockUsedPtr) +{ + int retVal; + yaffs_BlockInfo *bi; - if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE) - ok = yaffs_WriteCheckpointTnodes(obj); - } - } - } + if (dev->allocationBlock < 0) { + /* Get next block to allocate off */ + dev->allocationBlock = yaffs_FindBlockForAllocation(dev); + dev->allocationPage = 0; } - /* Dump end of list */ - memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject)); - cp.structType = sizeof(cp); - - if (ok) - ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)); + if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) { + /* Not enough space to allocate unless we're allowed to use the reserve. */ + return -1; + } - return ok ? 1 : 0; -} + if (dev->nErasedBlocks < dev->param.nReservedBlocks + && dev->allocationPage == 0) { + T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR))); + } -static int yaffs_ReadCheckpointObjects(yaffs_Device *dev) -{ - yaffs_Object *obj; - yaffs_CheckpointObject cp; - int ok = 1; - int done = 0; - yaffs_Object *hardList = NULL; - - while (ok && !done) { - ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp)); - if (cp.structType != sizeof(cp)) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR), - cp.structType, (int)sizeof(cp), ok)); - ok = 0; - } + /* Next page please.... */ + if (dev->allocationBlock >= 0) { + bi = yaffs_GetBlockInfo(dev, dev->allocationBlock); - T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR), - cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk)); - - if (ok && cp.objectId == ~0) - done = 1; - else if (ok) { - obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType); - if (obj) { - ok = yaffs_CheckpointObjectToObject(obj, &cp); - if (!ok) - break; - if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) { - ok = yaffs_ReadCheckpointTnodes(obj); - } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) { - obj->hardLinks.next = - (struct ylist_head *) hardList; - hardList = obj; - } - } else - ok = 0; - } - } + retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) + + dev->allocationPage; + bi->pagesInUse++; + yaffs_SetChunkBit(dev, dev->allocationBlock, + dev->allocationPage); - if (ok) - yaffs_HardlinkFixup(dev, hardList); + dev->allocationPage++; - return ok ? 1 : 0; -} + dev->nFreeChunks--; -static int yaffs_WriteCheckpointSum(yaffs_Device *dev) -{ - __u32 checkpointSum; - int ok; + /* If the block is full set the state to full */ + if (dev->allocationPage >= dev->param.nChunksPerBlock) { + bi->blockState = YAFFS_BLOCK_STATE_FULL; + dev->allocationBlock = -1; + } - yaffs_GetCheckpointSum(dev, &checkpointSum); + if (blockUsedPtr) + *blockUsedPtr = bi; - ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum)); + return retVal; + } - if (!ok) - return 0; + T(YAFFS_TRACE_ERROR, + (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); - return 1; + return -1; } -static int yaffs_ReadCheckpointSum(yaffs_Device *dev) +static int yaffs_GetErasedChunks(yaffs_Device *dev) { - __u32 checkpointSum0; - __u32 checkpointSum1; - int ok; + int n; - yaffs_GetCheckpointSum(dev, &checkpointSum0); + n = dev->nErasedBlocks * dev->param.nChunksPerBlock; - ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1)); + if (dev->allocationBlock > 0) + n += (dev->param.nChunksPerBlock - dev->allocationPage); - if (!ok) - return 0; + return n; - if (checkpointSum0 != checkpointSum1) - return 0; +} - return 1; +/* + * yaffs_SkipRestOfBlock() skips over the rest of the allocation block + * if we don't want to write to it. + */ +void yaffs_SkipRestOfBlock(yaffs_Device *dev) +{ + if(dev->allocationBlock > 0){ + yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock); + if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){ + bi->blockState = YAFFS_BLOCK_STATE_FULL; + dev->allocationBlock = -1; + } + } } -static int yaffs_WriteCheckpointData(yaffs_Device *dev) +static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block, + int wholeBlock) { - int ok = 1; - - if (!yaffs_CheckpointRequired(dev)) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR))); - ok = 0; - } + int oldChunk; + int newChunk; + int markNAND; + int retVal = YAFFS_OK; + int i; + int isCheckpointBlock; + int matchingChunk; + int maxCopies; - if (ok) - ok = yaffs_CheckpointOpen(dev, 1); + int chunksBefore = yaffs_GetErasedChunks(dev); + int chunksAfter; - if (ok) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR))); - ok = yaffs_WriteCheckpointValidityMarker(dev, 1); - } - if (ok) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR))); - ok = yaffs_WriteCheckpointDevice(dev); - } - if (ok) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR))); - ok = yaffs_WriteCheckpointObjects(dev); - } - if (ok) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR))); - ok = yaffs_WriteCheckpointValidityMarker(dev, 0); - } + yaffs_ExtendedTags tags; - if (ok) - ok = yaffs_WriteCheckpointSum(dev); + yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block); - if (!yaffs_CheckpointClose(dev)) - ok = 0; + yaffs_Object *object; - if (ok) - dev->isCheckpointed = 1; - else - dev->isCheckpointed = 0; + isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT); - return dev->isCheckpointed; -} -static int yaffs_ReadCheckpointData(yaffs_Device *dev) -{ - int ok = 1; + T(YAFFS_TRACE_TRACING, + (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR), + block, + bi->pagesInUse, + bi->hasShrinkHeader, + wholeBlock)); - if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR))); - ok = 0; - } + /*yaffs_VerifyFreeChunks(dev); */ - if (ok) - ok = yaffs_CheckpointOpen(dev, 0); /* open for read */ + if(bi->blockState == YAFFS_BLOCK_STATE_FULL) + bi->blockState = YAFFS_BLOCK_STATE_COLLECTING; + + bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */ - if (ok) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR))); - ok = yaffs_ReadCheckpointValidityMarker(dev, 1); - } - if (ok) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR))); - ok = yaffs_ReadCheckpointDevice(dev); - } - if (ok) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR))); - ok = yaffs_ReadCheckpointObjects(dev); - } - if (ok) { - T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR))); - ok = yaffs_ReadCheckpointValidityMarker(dev, 0); - } + dev->gcDisable = 1; - if (ok) { - ok = yaffs_ReadCheckpointSum(dev); - T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok)); - } + if (isCheckpointBlock || + !yaffs_StillSomeChunkBits(dev, block)) { + T(YAFFS_TRACE_TRACING, + (TSTR + ("Collecting block %d that has no chunks in use" TENDSTR), + block)); + yaffs_BlockBecameDirty(dev, block); + } else { - if (!yaffs_CheckpointClose(dev)) - ok = 0; + __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__); - if (ok) - dev->isCheckpointed = 1; - else - dev->isCheckpointed = 0; + yaffs_VerifyBlock(dev, bi, block); - return ok ? 1 : 0; + maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 5; + oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk; -} + for (/* init already done */; + retVal == YAFFS_OK && + dev->gcChunk < dev->param.nChunksPerBlock && + (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) && + maxCopies > 0; + dev->gcChunk++, oldChunk++) { + if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) { -static void yaffs_InvalidateCheckpoint(yaffs_Device *dev) -{ - if (dev->isCheckpointed || - dev->blocksInCheckpoint > 0) { - dev->isCheckpointed = 0; - yaffs_CheckpointInvalidateStream(dev); - } - if (dev->param.markSuperBlockDirty) - dev->param.markSuperBlockDirty(dev); -} + /* This page is in use and might need to be copied off */ + maxCopies--; -int yaffs_CheckpointSave(yaffs_Device *dev) -{ + markNAND = 1; - T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed)); + yaffs_InitialiseTags(&tags); - yaffs_VerifyObjects(dev); - yaffs_VerifyBlocks(dev); - yaffs_VerifyFreeChunks(dev); + yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk, + buffer, &tags); - if (!dev->isCheckpointed) { - yaffs_InvalidateCheckpoint(dev); - yaffs_WriteCheckpointData(dev); - } + object = + yaffs_FindObjectByNumber(dev, + tags.objectId); - T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed)); + T(YAFFS_TRACE_GC_DETAIL, + (TSTR + ("Collecting chunk in block %d, %d %d %d " TENDSTR), + dev->gcChunk, tags.objectId, tags.chunkId, + tags.byteCount)); - return dev->isCheckpointed; -} + if (object && !yaffs_SkipVerification(dev)) { + if (tags.chunkId == 0) + matchingChunk = object->hdrChunk; + else if (object->softDeleted) + matchingChunk = oldChunk; /* Defeat the test */ + else + matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL); -int yaffs_CheckpointRestore(yaffs_Device *dev) -{ - int retval; - T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed)); + if (oldChunk != matchingChunk) + T(YAFFS_TRACE_ERROR, + (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR), + oldChunk, matchingChunk, tags.objectId, tags.chunkId)); - retval = yaffs_ReadCheckpointData(dev); + } - if (dev->isCheckpointed) { - yaffs_VerifyObjects(dev); - yaffs_VerifyBlocks(dev); - yaffs_VerifyFreeChunks(dev); - } + if (!object) { + T(YAFFS_TRACE_ERROR, + (TSTR + ("page %d in gc has no object: %d %d %d " + TENDSTR), oldChunk, + tags.objectId, tags.chunkId, tags.byteCount)); + } - T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed)); + if (object && + object->deleted && + object->softDeleted && + tags.chunkId != 0) { + /* Data chunk in a soft deleted file, throw it away + * It's a soft deleted data chunk, + * No need to copy this, just forget about it and + * fix up the object. + */ + + /* Free chunks already includes softdeleted chunks. + * How ever this chunk is going to soon be really deleted + * which will increment free chunks. + * We have to decrement free chunks so this works out properly. + */ + dev->nFreeChunks--; + bi->softDeletions--; - return retval; -} + object->nDataChunks--; -/*--------------------- File read/write ------------------------ - * Read and write have very similar structures. - * In general the read/write has three parts to it - * An incomplete chunk to start with (if the read/write is not chunk-aligned) - * Some complete chunks - * An incomplete chunk to end off with - * - * Curve-balls: the first chunk might also be the last chunk. - */ + if (object->nDataChunks <= 0) { + /* remeber to clean up the object */ + dev->gcCleanupList[dev->nCleanups] = + tags.objectId; + dev->nCleanups++; + } + markNAND = 0; + } else if (0) { + /* Todo object && object->deleted && object->nDataChunks == 0 */ + /* Deleted object header with no data chunks. + * Can be discarded and the file deleted. + */ + object->hdrChunk = 0; + yaffs_FreeTnode(object->myDev, + object->variant. + fileVariant.top); + object->variant.fileVariant.top = NULL; + yaffs_DoGenericObjectDeletion(object); -int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset, - int nBytes) -{ + } else if (object) { + /* It's either a data chunk in a live file or + * an ObjectHeader, so we're interested in it. + * NB Need to keep the ObjectHeaders of deleted files + * until the whole file has been deleted off + */ + tags.serialNumber++; - int chunk; - __u32 start; - int nToCopy; - int n = nBytes; - int nDone = 0; - yaffs_ChunkCache *cache; + dev->nGCCopies++; - yaffs_Device *dev; + if (tags.chunkId == 0) { + /* It is an object Id, + * We need to nuke the shrinkheader flags first + * Also need to clean up shadowing. + * We no longer want the shrinkHeader flag since its work is done + * and if it is left in place it will mess up scanning. + */ - dev = in->myDev; + yaffs_ObjectHeader *oh; + oh = (yaffs_ObjectHeader *)buffer; - while (n > 0) { - /* chunk = offset / dev->nDataBytesPerChunk + 1; */ - /* start = offset % dev->nDataBytesPerChunk; */ - yaffs_AddrToChunk(dev, offset, &chunk, &start); - chunk++; + oh->isShrink = 0; + tags.extraIsShrinkHeader = 0; - /* OK now check for the curveball where the start and end are in - * the same chunk. - */ - if ((start + n) < dev->nDataBytesPerChunk) - nToCopy = n; - else - nToCopy = dev->nDataBytesPerChunk - start; + oh->shadowsObject = 0; + oh->inbandShadowsObject = 0; + tags.extraShadows = 0; - cache = yaffs_FindChunkCache(in, chunk); + /* Update file size */ + if(object->variantType == YAFFS_OBJECT_TYPE_FILE){ + oh->fileSize = object->variant.fileVariant.fileSize; + tags.extraFileLength = oh->fileSize; + } - /* If the chunk is already in the cache or it is less than a whole chunk - * or we're using inband tags then use the cache (if there is caching) - * else bypass the cache. - */ - if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) { - if (dev->param.nShortOpCaches > 0) { + yaffs_VerifyObjectHeader(object, oh, &tags, 1); + newChunk = + yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1); + } else + newChunk = + yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1); - /* If we can't find the data in the cache, then load it up. */ + if (newChunk < 0) { + retVal = YAFFS_FAIL; + } else { - if (!cache) { - cache = yaffs_GrabChunkCache(in->myDev); - cache->object = in; - cache->chunkId = chunk; - cache->dirty = 0; - cache->locked = 0; - yaffs_ReadChunkDataFromObject(in, chunk, - cache-> - data); - cache->nBytes = 0; - } + /* Ok, now fix up the Tnodes etc. */ - yaffs_UseChunkCache(dev, cache, 0); + if (tags.chunkId == 0) { + /* It's a header */ + object->hdrChunk = newChunk; + object->serial = tags.serialNumber; + } else { + /* It's a data chunk */ + int ok; + ok = yaffs_PutChunkIntoFile + (object, + tags.chunkId, + newChunk, 0); + } + } + } - cache->locked = 1; + if (retVal == YAFFS_OK) + yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__); + } + } - memcpy(buffer, &cache->data[start], nToCopy); + yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); - cache->locked = 0; - } else { - /* Read into the local buffer then copy..*/ - __u8 *localBuffer = - yaffs_GetTempBuffer(dev, __LINE__); - yaffs_ReadChunkDataFromObject(in, chunk, - localBuffer); - memcpy(buffer, &localBuffer[start], nToCopy); + } + yaffs_VerifyCollectedBlock(dev, bi, block); - yaffs_ReleaseTempBuffer(dev, localBuffer, - __LINE__); - } - } else { - /* A full chunk. Read directly into the supplied buffer. */ - yaffs_ReadChunkDataFromObject(in, chunk, buffer); + if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) { + /* + * The gc did not complete. Set block state back to FULL + * because checkpointing does not restore gc. + */ + bi->blockState = YAFFS_BLOCK_STATE_FULL; + } else { + /* The gc completed. */ + /* Do any required cleanups */ + for (i = 0; i < dev->nCleanups; i++) { + /* Time to delete the file too */ + object = + yaffs_FindObjectByNumber(dev, + dev->gcCleanupList[i]); + if (object) { + yaffs_FreeTnode(dev, + object->variant.fileVariant. + top); + object->variant.fileVariant.top = NULL; + T(YAFFS_TRACE_GC, + (TSTR + ("yaffs: About to finally delete object %d" + TENDSTR), object->objectId)); + yaffs_DoGenericObjectDeletion(object); + object->myDev->nDeletedFiles--; + } } - n -= nToCopy; - offset += nToCopy; - buffer += nToCopy; - nDone += nToCopy; + chunksAfter = yaffs_GetErasedChunks(dev); + if (chunksBefore >= chunksAfter) { + T(YAFFS_TRACE_GC, + (TSTR + ("gc did not increase free chunks before %d after %d" + TENDSTR), chunksBefore, chunksAfter)); + } + dev->gcBlock = 0; + dev->gcChunk = 0; + dev->nCleanups = 0; } - return nDone; -} - -int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset, - int nBytes, int writeThrough) -{ + dev->gcDisable = 0; - int chunk; - __u32 start; - int nToCopy; - int n = nBytes; - int nDone = 0; - int nToWriteBack; - int startOfWrite = offset; - int chunkWritten = 0; - __u32 nBytesRead; - __u32 chunkStart; + return retVal; +} - yaffs_Device *dev; +/* + * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough) + * for garbage collection. + */ - dev = in->myDev; +static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev, + int aggressive, + int background) +{ + int i; + int iterations; + unsigned selected = 0; + int prioritised = 0; + int prioritisedExists = 0; + yaffs_BlockInfo *bi; + int threshold; - while (n > 0 && chunkWritten >= 0) { - yaffs_AddrToChunk(dev, offset, &chunk, &start); + /* First let's see if we need to grab a prioritised block */ + if (dev->hasPendingPrioritisedGCs && !aggressive) { + dev->gcDirtiest = 0; + bi = dev->blockInfo; + for (i = dev->internalStartBlock; + i <= dev->internalEndBlock && !selected; + i++) { - if (chunk * dev->nDataBytesPerChunk + start != offset || - start >= dev->nDataBytesPerChunk) { - T(YAFFS_TRACE_ERROR, ( - TSTR("AddrToChunk of offset %d gives chunk %d start %d" - TENDSTR), - (int)offset, chunk, start)); + if (bi->gcPrioritise) { + prioritisedExists = 1; + if (bi->blockState == YAFFS_BLOCK_STATE_FULL && + yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) { + selected = i; + prioritised = 1; + } + } + bi++; } - chunk++; /* File pos to chunk in file offset */ - /* OK now check for the curveball where the start and end are in - * the same chunk. + /* + * If there is a prioritised block and none was selected then + * this happened because there is at least one old dirty block gumming + * up the works. Let's gc the oldest dirty block. */ - if ((start + n) < dev->nDataBytesPerChunk) { - nToCopy = n; + if(prioritisedExists && + !selected && + dev->oldestDirtyBlock > 0) + selected = dev->oldestDirtyBlock; - /* Now folks, to calculate how many bytes to write back.... - * If we're overwriting and not writing to then end of file then - * we need to write back as much as was there before. - */ + if (!prioritisedExists) /* None found, so we can clear this */ + dev->hasPendingPrioritisedGCs = 0; + } - chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk); + /* If we're doing aggressive GC then we are happy to take a less-dirty block, and + * search harder. + * else (we're doing a leasurely gc), then we only bother to do this if the + * block has only a few pages in use. + */ - if (chunkStart > in->variant.fileVariant.fileSize) - nBytesRead = 0; /* Past end of file */ - else - nBytesRead = in->variant.fileVariant.fileSize - chunkStart; + if (!selected){ + int pagesUsed; + int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1; + if (aggressive){ + threshold = dev->param.nChunksPerBlock; + iterations = nBlocks; + } else { + int maxThreshold; - if (nBytesRead > dev->nDataBytesPerChunk) - nBytesRead = dev->nDataBytesPerChunk; + if(background) + maxThreshold = dev->param.nChunksPerBlock/2; + else + maxThreshold = dev->param.nChunksPerBlock/8; - nToWriteBack = - (nBytesRead > - (start + n)) ? nBytesRead : (start + n); + if(maxThreshold < YAFFS_GC_PASSIVE_THRESHOLD) + maxThreshold = YAFFS_GC_PASSIVE_THRESHOLD; - if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk) - YBUG(); + threshold = background ? + (dev->gcNotDone + 2) * 2 : 0; + if(threshold maxThreshold) + threshold = maxThreshold; - } else { - nToCopy = dev->nDataBytesPerChunk - start; - nToWriteBack = dev->nDataBytesPerChunk; + iterations = nBlocks / 16 + 1; + if (iterations > 100) + iterations = 100; } - if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) { - /* An incomplete start or end chunk (or maybe both start and end chunk), - * or we're using inband tags, so we want to use the cache buffers. - */ - if (dev->param.nShortOpCaches > 0) { - yaffs_ChunkCache *cache; - /* If we can't find the data in the cache, then load the cache */ - cache = yaffs_FindChunkCache(in, chunk); + for (i = 0; + i < iterations && + (dev->gcDirtiest < 1 || + dev->gcPagesInUse > YAFFS_GC_GOOD_ENOUGH); + i++) { + dev->gcBlockFinder++; + if (dev->gcBlockFinder < dev->internalStartBlock || + dev->gcBlockFinder > dev->internalEndBlock) + dev->gcBlockFinder = dev->internalStartBlock; - if (!cache - && yaffs_CheckSpaceForAllocation(dev, 1)) { - cache = yaffs_GrabChunkCache(dev); - cache->object = in; - cache->chunkId = chunk; - cache->dirty = 0; - cache->locked = 0; - yaffs_ReadChunkDataFromObject(in, chunk, - cache->data); - } else if (cache && - !cache->dirty && - !yaffs_CheckSpaceForAllocation(dev, 1)) { - /* Drop the cache if it was a read cache item and - * no space check has been made for it. - */ - cache = NULL; - } + bi = yaffs_GetBlockInfo(dev, dev->gcBlockFinder); - if (cache) { - yaffs_UseChunkCache(dev, cache, 1); - cache->locked = 1; + pagesUsed = bi->pagesInUse - bi->softDeletions; + + if (bi->blockState == YAFFS_BLOCK_STATE_FULL && + pagesUsed < dev->param.nChunksPerBlock && + (dev->gcDirtiest < 1 || pagesUsed < dev->gcPagesInUse) && + yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) { + dev->gcDirtiest = dev->gcBlockFinder; + dev->gcPagesInUse = pagesUsed; + } + } + + if(dev->gcDirtiest > 0 && dev->gcPagesInUse <= threshold) + selected = dev->gcDirtiest; + } + + /* + * If nothing has been selected for a while, try selecting the oldest dirty + * because that's gumming up the works. + */ + if(!selected && dev->param.isYaffs2 && + dev->gcNotDone >= ( background ? 10 : 20)){ + yaffs2_FindOldestDirtySequence(dev); + if(dev->oldestDirtyBlock > 0) { + selected = dev->oldestDirtyBlock; + dev->gcDirtiest = selected; + dev->oldestDirtyGCs++; + bi = yaffs_GetBlockInfo(dev, selected); + dev->gcPagesInUse = bi->pagesInUse - bi->softDeletions; + } else + dev->gcNotDone = 0; + } - memcpy(&cache->data[start], buffer, - nToCopy); + if(selected){ + T(YAFFS_TRACE_GC, + (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), + selected, + dev->param.nChunksPerBlock - dev->gcPagesInUse, + prioritised)); + dev->nGCBlocks++; + if(background) + dev->backgroundGCs++; - cache->locked = 0; - cache->nBytes = nToWriteBack; + dev->gcDirtiest = 0; + dev->gcPagesInUse = 0; + dev->gcNotDone = 0; + if(dev->refreshSkip > 0) + dev->refreshSkip--; + } else{ + dev->gcNotDone++; + T(YAFFS_TRACE_GC, + (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR), + dev->gcBlockFinder, dev->gcNotDone, + threshold, + dev->gcDirtiest, dev->gcPagesInUse, + dev->oldestDirtyBlock, + background ? " bg" : "")); + } - if (writeThrough) { - chunkWritten = - yaffs_WriteChunkDataToObject - (cache->object, - cache->chunkId, - cache->data, cache->nBytes, - 1); - cache->dirty = 0; - } + return selected; +} - } else { - chunkWritten = -1; /* fail the write */ - } - } else { - /* An incomplete start or end chunk (or maybe both start and end chunk) - * Read into the local buffer then copy, then copy over and write back. - */ +/* New garbage collector + * If we're very low on erased blocks then we do aggressive garbage collection + * otherwise we do "leasurely" garbage collection. + * Aggressive gc looks further (whole array) and will accept less dirty blocks. + * Passive gc only inspects smaller areas and will only accept more dirty blocks. + * + * The idea is to help clear out space in a more spread-out manner. + * Dunno if it really does anything useful. + */ +static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background) +{ + int aggressive = 0; + int gcOk = YAFFS_OK; + int maxTries = 0; + int minErased; + int erasedChunks; + int checkpointBlockAdjust; - __u8 *localBuffer = - yaffs_GetTempBuffer(dev, __LINE__); + if(dev->param.gcControl && + (dev->param.gcControl(dev) & 1) == 0) + return YAFFS_OK; - yaffs_ReadChunkDataFromObject(in, chunk, - localBuffer); + if (dev->gcDisable) { + /* Bail out so we don't get recursive gc */ + return YAFFS_OK; + } + /* This loop should pass the first time. + * We'll only see looping here if the collection does not increase space. + */ + do { + maxTries++; - memcpy(&localBuffer[start], buffer, nToCopy); + checkpointBlockAdjust = yaffs2_CalcCheckpointBlocksRequired(dev); - chunkWritten = - yaffs_WriteChunkDataToObject(in, chunk, - localBuffer, - nToWriteBack, - 0); + minErased = dev->param.nReservedBlocks + checkpointBlockAdjust + 1; + erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock; - yaffs_ReleaseTempBuffer(dev, localBuffer, - __LINE__); + /* If we need a block soon then do aggressive gc.*/ + if (dev->nErasedBlocks < minErased) + aggressive = 1; + else { + if(!background && erasedChunks > (dev->nFreeChunks / 4)) + break; + if(dev->gcSkip > 20) + dev->gcSkip = 20; + if(erasedChunks < dev->nFreeChunks/2 || + dev->gcSkip < 1 || + background) + aggressive = 0; + else { + dev->gcSkip--; + break; } + } - } else { - /* A full chunk. Write directly from the supplied buffer. */ + dev->gcSkip = 5; + /* If we don't already have a block being gc'd then see if we should start another */ + if (dev->gcBlock < 1 && !aggressive) { + dev->gcBlock = yaffs2_FindRefreshBlock(dev); + dev->gcChunk = 0; + dev->nCleanups=0; + } + if (dev->gcBlock < 1) { + dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive, background); + dev->gcChunk = 0; + dev->nCleanups=0; + } - chunkWritten = - yaffs_WriteChunkDataToObject(in, chunk, buffer, - dev->nDataBytesPerChunk, - 0); + if (dev->gcBlock > 0) { + dev->allGCs++; + if (!aggressive) + dev->passiveGCs++; - /* Since we've overwritten the cached data, we better invalidate it. */ - yaffs_InvalidateChunkCache(in, chunk); - } + T(YAFFS_TRACE_GC, + (TSTR + ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR), + dev->nErasedBlocks, aggressive)); - if (chunkWritten >= 0) { - n -= nToCopy; - offset += nToCopy; - buffer += nToCopy; - nDone += nToCopy; + gcOk = yaffs_GarbageCollectBlock(dev, dev->gcBlock, aggressive); } - } + if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && dev->gcBlock > 0) { + T(YAFFS_TRACE_GC, + (TSTR + ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d" + TENDSTR), dev->nErasedBlocks, maxTries, dev->gcBlock)); + } + } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) && + (dev->gcBlock > 0) && + (maxTries < 2)); - /* Update file object */ + return aggressive ? gcOk : YAFFS_OK; +} - if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) - in->variant.fileVariant.fileSize = (startOfWrite + nDone); +/* + * yaffs_BackgroundGarbageCollect() + * Garbage collects. Intended to be called from a background thread. + * Returns non-zero if at least half the free chunks are erased. + */ +int yaffs_BackgroundGarbageCollect(yaffs_Device *dev, unsigned urgency) +{ + int erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock; - in->dirty = 1; + T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency)); - return nDone; + yaffs_CheckGarbageCollection(dev, 1); + return erasedChunks > dev->nFreeChunks/2; } -int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset, - int nBytes, int writeThrough) +/*------------------------- TAGS --------------------------------*/ + +static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, + int chunkInObject) { - yaffs_HandleHole(in,offset); - return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough); -} + return (tags->chunkId == chunkInObject && + tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0; +} -/* ---------------------- File resizing stuff ------------------ */ +/*-------------------- Data file manipulation -----------------*/ -static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize) +static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode, + yaffs_ExtendedTags *tags) { + /*Get the Tnode, then get the level 0 offset chunk offset */ + yaffs_Tnode *tn; + int theChunk = -1; + yaffs_ExtendedTags localTags; + int retVal = -1; yaffs_Device *dev = in->myDev; - int oldFileSize = in->variant.fileVariant.fileSize; - int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk; + if (!tags) { + /* Passed a NULL, so use our own tags space */ + tags = &localTags; + } - int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) / - dev->nDataBytesPerChunk; - int i; - int chunkId; + tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode); - /* Delete backwards so that we don't end up with holes if - * power is lost part-way through the operation. - */ - for (i = lastDel; i >= startDel; i--) { - /* NB this could be optimised somewhat, - * eg. could retrieve the tags and write them without - * using yaffs_DeleteChunk - */ + if (tn) { + theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode); - chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL); - if (chunkId > 0) { - if (chunkId < - (dev->internalStartBlock * dev->param.nChunksPerBlock) - || chunkId >= - ((dev->internalEndBlock + - 1) * dev->param.nChunksPerBlock)) { - T(YAFFS_TRACE_ALWAYS, - (TSTR("Found daft chunkId %d for %d" TENDSTR), - chunkId, i)); - } else { - in->nDataChunks--; - yaffs_DeleteChunk(dev, chunkId, 1, __LINE__); - } - } + retVal = + yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId, + chunkInInode); } - + return retVal; } - -static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize) +static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode, + yaffs_ExtendedTags *tags) { - int newFullChunks; - __u32 newSizeOfPartialChunk; - yaffs_Device *dev = obj->myDev; + /* Get the Tnode, then get the level 0 offset chunk offset */ + yaffs_Tnode *tn; + int theChunk = -1; + yaffs_ExtendedTags localTags; - yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk); + yaffs_Device *dev = in->myDev; + int retVal = -1; - yaffs_PruneResizedChunks(obj, newSize); + if (!tags) { + /* Passed a NULL, so use our own tags space */ + tags = &localTags; + } - if (newSizeOfPartialChunk != 0) { - int lastChunk = 1 + newFullChunks; - __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__); + tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode); - /* Got to read and rewrite the last chunk with its new size and zero pad */ - yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer); - memset(localBuffer + newSizeOfPartialChunk, 0, - dev->nDataBytesPerChunk - newSizeOfPartialChunk); + if (tn) { + + theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode); - yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer, - newSizeOfPartialChunk, 1); + retVal = + yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId, + chunkInInode); - yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__); + /* Delete the entry in the filestructure (if found) */ + if (retVal != -1) + yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0); } - obj->variant.fileVariant.fileSize = newSize; - - yaffs_PruneFileStructure(dev, &obj->variant.fileVariant); + return retVal; } -static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize) +int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode, + int chunkInNAND, int inScan) { - /* if newsSize > oldFileSize. - * We're going to be writing a hole. - * If the hole is small then write zeros otherwise write a start of hole marker. + /* NB inScan is zero unless scanning. + * For forward scanning, inScan is > 0; + * for backward scanning inScan is < 0 + * + * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there. */ - - loff_t oldFileSize; - int increase; - int smallHole ; - int result = YAFFS_OK; - yaffs_Device *dev = NULL; + yaffs_Tnode *tn; + yaffs_Device *dev = in->myDev; + int existingChunk; + yaffs_ExtendedTags existingTags; + yaffs_ExtendedTags newTags; + unsigned existingSerial, newSerial; - __u8 *localBuffer = NULL; - - int smallIncreaseOk = 0; - - if(!obj) - return YAFFS_FAIL; + if (in->variantType != YAFFS_OBJECT_TYPE_FILE) { + /* Just ignore an attempt at putting a chunk into a non-file during scanning + * If it is not during Scanning then something went wrong! + */ + if (!inScan) { + T(YAFFS_TRACE_ERROR, + (TSTR + ("yaffs tragedy:attempt to put data chunk into a non-file" + TENDSTR))); + YBUG(); + } - if(obj->variantType != YAFFS_OBJECT_TYPE_FILE) - return YAFFS_FAIL; - - dev = obj->myDev; - - /* Bail out if not yaffs2 mode */ - if(!dev->param.isYaffs2) + yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__); return YAFFS_OK; + } - oldFileSize = obj->variant.fileVariant.fileSize; - - if (newSize <= oldFileSize) + tn = yaffs_AddOrFindLevel0Tnode(dev, + &in->variant.fileVariant, + chunkInInode, + NULL); + if (!tn) + return YAFFS_FAIL; + + if(!chunkInNAND) + /* Dummy insert, bail now */ return YAFFS_OK; - increase = newSize - oldFileSize; + existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode); - if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk && - yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1)) - smallHole = 1; - else - smallHole = 0; + if (inScan != 0) { + /* If we're scanning then we need to test for duplicates + * NB This does not need to be efficient since it should only ever + * happen when the power fails during a write, then only one + * chunk should ever be affected. + * + * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO + * Update: For backward scanning we don't need to re-read tags so this is quite cheap. + */ - if(smallHole) - localBuffer= yaffs_GetTempBuffer(dev, __LINE__); - - if(localBuffer){ - /* fill hole with zero bytes */ - int pos = oldFileSize; - int thisWrite; - int written; - memset(localBuffer,0,dev->nDataBytesPerChunk); - smallIncreaseOk = 1; - - while(increase > 0 && smallIncreaseOk){ - thisWrite = increase; - if(thisWrite > dev->nDataBytesPerChunk) - thisWrite = dev->nDataBytesPerChunk; - written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0); - if(written == thisWrite){ - pos += thisWrite; - increase -= thisWrite; - } else - smallIncreaseOk = 0; - } + if (existingChunk > 0) { + /* NB Right now existing chunk will not be real chunkId if the chunk group size > 1 + * thus we have to do a FindChunkInFile to get the real chunk id. + * + * We have a duplicate now we need to decide which one to use: + * + * Backwards scanning YAFFS2: The old one is what we use, dump the new one. + * Forward scanning YAFFS2: The new one is what we use, dump the old one. + * YAFFS1: Get both sets of tags and compare serial numbers. + */ - yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__); + if (inScan > 0) { + /* Only do this for forward scanning */ + yaffs_ReadChunkWithTagsFromNAND(dev, + chunkInNAND, + NULL, &newTags); - /* If we were out of space then reverse any chunks we've added */ - if(!smallIncreaseOk) - yaffs_ResizeDown(obj, oldFileSize); - } - - if (!smallIncreaseOk && - obj->parent && - obj->parent->objectId != YAFFS_OBJECTID_UNLINKED && - obj->parent->objectId != YAFFS_OBJECTID_DELETED){ - /* Write a hole start header with the old file size */ - yaffs_UpdateObjectHeader(obj, NULL, 0, 1, 0, NULL); - } + /* Do a proper find */ + existingChunk = + yaffs_FindChunkInFile(in, chunkInInode, + &existingTags); + } - return result; + if (existingChunk <= 0) { + /*Hoosterman - how did this happen? */ -} + T(YAFFS_TRACE_ERROR, + (TSTR + ("yaffs tragedy: existing chunk < 0 in scan" + TENDSTR))); -int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize) -{ - yaffs_Device *dev = in->myDev; - int oldFileSize = in->variant.fileVariant.fileSize; + } - yaffs_FlushFilesChunkCache(in); - yaffs_InvalidateWholeChunkCache(in); + /* NB The deleted flags should be false, otherwise the chunks will + * not be loaded during a scan + */ - yaffs_CheckGarbageCollection(dev,0); + if (inScan > 0) { + newSerial = newTags.serialNumber; + existingSerial = existingTags.serialNumber; + } - if (in->variantType != YAFFS_OBJECT_TYPE_FILE) - return YAFFS_FAIL; + if ((inScan > 0) && + (existingChunk <= 0 || + ((existingSerial + 1) & 3) == newSerial)) { + /* Forward scanning. + * Use new + * Delete the old one and drop through to update the tnode + */ + yaffs_DeleteChunk(dev, existingChunk, 1, + __LINE__); + } else { + /* Backward scanning or we want to use the existing one + * Use existing. + * Delete the new one and return early so that the tnode isn't changed + */ + yaffs_DeleteChunk(dev, chunkInNAND, 1, + __LINE__); + return YAFFS_OK; + } + } - if (newSize == oldFileSize) - return YAFFS_OK; - - if(newSize > oldFileSize){ - yaffs_HandleHole(in,newSize); - in->variant.fileVariant.fileSize = newSize; - } else { - /* newSize < oldFileSize */ - yaffs_ResizeDown(in, newSize); - } + } - /* Write a new object header to reflect the resize. - * show we've shrunk the file, if need be - * Do this only if the file is not in the deleted directories - * and is not shadowed. - */ - if (in->parent && - !in->isShadowed && - in->parent->objectId != YAFFS_OBJECTID_UNLINKED && - in->parent->objectId != YAFFS_OBJECTID_DELETED) - yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL); + if (existingChunk == 0) + in->nDataChunks++; + yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND); return YAFFS_OK; } -loff_t yaffs_GetFileSize(yaffs_Object *obj) +static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode, + __u8 *buffer) { - YCHAR *alias = NULL; - obj = yaffs_GetEquivalentObject(obj); + int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL); - switch (obj->variantType) { - case YAFFS_OBJECT_TYPE_FILE: - return obj->variant.fileVariant.fileSize; - case YAFFS_OBJECT_TYPE_SYMLINK: - alias = obj->variant.symLinkVariant.alias; - if(!alias) - return 0; - return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH); - default: + if (chunkInNAND >= 0) + return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND, + buffer, NULL); + else { + T(YAFFS_TRACE_NANDACCESS, + (TSTR("Chunk %d not found zero instead" TENDSTR), + chunkInNAND)); + /* get sane (zero) data if you read a hole */ + memset(buffer, 0, in->myDev->nDataBytesPerChunk); return 0; } + } +void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn) +{ + int block; + int page; + yaffs_ExtendedTags tags; + yaffs_BlockInfo *bi; + if (chunkId <= 0) + return; -int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync) -{ - int retVal; - if (in->dirty) { - yaffs_FlushFilesChunkCache(in); - if(dataSync) /* Only sync data */ - retVal=YAFFS_OK; - else { - if (updateTime) { -#ifdef CONFIG_YAFFS_WINCE - yfsd_WinFileTimeNow(in->win_mtime); -#else + dev->nDeletions++; + block = chunkId / dev->param.nChunksPerBlock; + page = chunkId % dev->param.nChunksPerBlock; - in->yst_mtime = Y_CURRENT_TIME; -#endif - } + if (!yaffs_CheckChunkBit(dev, block, page)) + T(YAFFS_TRACE_VERIFY, + (TSTR("Deleting invalid chunk %d"TENDSTR), + chunkId)); - retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL) >= - 0) ? YAFFS_OK : YAFFS_FAIL; - } + bi = yaffs_GetBlockInfo(dev, block); + + yaffs2_UpdateOldestDirtySequence(dev, block, bi); + + T(YAFFS_TRACE_DELETION, + (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId)); + + if (!dev->param.isYaffs2 && markNAND && + bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) { + + yaffs_InitialiseTags(&tags); + + tags.chunkDeleted = 1; + + yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags); + yaffs_HandleUpdateChunk(dev, chunkId, &tags); } else { - retVal = YAFFS_OK; + dev->nUnmarkedDeletions++; } - return retVal; - -} + /* Pull out of the management area. + * If the whole block became dirty, this will kick off an erasure. + */ + if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || + bi->blockState == YAFFS_BLOCK_STATE_FULL || + bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING || + bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) { + dev->nFreeChunks++; -static int yaffs_DoGenericObjectDeletion(yaffs_Object *in) -{ + yaffs_ClearChunkBit(dev, block, page); - /* First off, invalidate the file's data in the cache, without flushing. */ - yaffs_InvalidateWholeChunkCache(in); + bi->pagesInUse--; - if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) { - /* Move to the unlinked directory so we have a record that it was deleted. */ - yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0); + if (bi->pagesInUse == 0 && + !bi->hasShrinkHeader && + bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING && + bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) { + yaffs_BlockBecameDirty(dev, block); + } } - yaffs_RemoveObjectFromDirectory(in); - yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__); - in->hdrChunk = 0; - - yaffs_FreeObject(in); - return YAFFS_OK; - } -/* yaffs_DeleteFile deletes the whole file data - * and the inode associated with the file. - * It does not delete the links associated with the file. - */ -static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in) +static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode, + const __u8 *buffer, int nBytes, + int useReserve) { + /* Find old chunk Need to do this to get serial number + * Write new one and patch into tree. + * Invalidate old tags. + */ - int retVal; - int immediateDeletion = 0; - yaffs_Device *dev = in->myDev; + int prevChunkId; + yaffs_ExtendedTags prevTags; - if (!in->myInode) - immediateDeletion = 1; + int newChunkId; + yaffs_ExtendedTags newTags; - if (immediateDeletion) { - retVal = - yaffs_ChangeObjectName(in, in->myDev->deletedDir, - _Y("deleted"), 0, 0); - T(YAFFS_TRACE_TRACING, - (TSTR("yaffs: immediate deletion of file %d" TENDSTR), - in->objectId)); - in->deleted = 1; - in->myDev->nDeletedFiles++; - if (dev->param.disableSoftDelete || dev->param.isYaffs2) - yaffs_ResizeFile(in, 0); - yaffs_SoftDeleteFile(in); - } else { - retVal = - yaffs_ChangeObjectName(in, in->myDev->unlinkedDir, - _Y("unlinked"), 0, 0); - } + yaffs_Device *dev = in->myDev; + yaffs_CheckGarbageCollection(dev,0); - return retVal; -} + /* Get the previous chunk at this location in the file if it exists. + * If it does not exist then put a zero into the tree. This creates + * the tnode now, rather than later when it is harder to clean up. + */ + prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags); + if(prevChunkId < 1 && + !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0)) + return 0; -int yaffs_DeleteFile(yaffs_Object *in) -{ - int retVal = YAFFS_OK; - int deleted; /* Need to cache value on stack if in is freed */ - yaffs_Device *dev = in->myDev; + /* Set up new tags */ + yaffs_InitialiseTags(&newTags); - if (dev->param.disableSoftDelete || dev->param.isYaffs2) - yaffs_ResizeFile(in, 0); + newTags.chunkId = chunkInInode; + newTags.objectId = in->objectId; + newTags.serialNumber = + (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1; + newTags.byteCount = nBytes; - if (in->nDataChunks > 0) { - /* Use soft deletion if there is data in the file. - * That won't be the case if it has been resized to zero. - */ - if (!in->unlinked) - retVal = yaffs_UnlinkFileIfNeeded(in); + if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) { + T(YAFFS_TRACE_ERROR, + (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes)); + YBUG(); + } + + + newChunkId = + yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags, + useReserve); - deleted = in->deleted; + if (newChunkId > 0) { + yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0); - if (retVal == YAFFS_OK && in->unlinked && !in->deleted) { - in->deleted = 1; - deleted = 1; - in->myDev->nDeletedFiles++; - yaffs_SoftDeleteFile(in); - } - return deleted ? YAFFS_OK : YAFFS_FAIL; - } else { - /* The file has no data chunks so we toss it immediately */ - yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top); - in->variant.fileVariant.top = NULL; - yaffs_DoGenericObjectDeletion(in); + if (prevChunkId > 0) + yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__); - return YAFFS_OK; + yaffs_VerifyFileSanity(in); } -} + return newChunkId; -static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj) -{ - return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) && - !(ylist_empty(&obj->variant.directoryVariant.children)); } -static int yaffs_DeleteDirectory(yaffs_Object *obj) +/* UpdateObjectHeader updates the header on NAND for an object. + * If name is not NULL, then that new name is used. + */ +int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force, + int isShrink, int shadows, yaffs_XAttrMod *xmod) { - /* First check that the directory is empty. */ - if (yaffs_IsNonEmptyDirectory(obj)) - return YAFFS_FAIL; - return yaffs_DoGenericObjectDeletion(obj); -} + yaffs_BlockInfo *bi; -static int yaffs_DeleteSymLink(yaffs_Object *in) -{ - if(in->variant.symLinkVariant.alias) - YFREE(in->variant.symLinkVariant.alias); - in->variant.symLinkVariant.alias=NULL; + yaffs_Device *dev = in->myDev; - return yaffs_DoGenericObjectDeletion(in); -} + int prevChunkId; + int retVal = 0; + int result = 0; -static int yaffs_DeleteHardLink(yaffs_Object *in) -{ - /* remove this hardlink from the list assocaited with the equivalent - * object - */ - ylist_del_init(&in->hardLinks); - return yaffs_DoGenericObjectDeletion(in); -} + int newChunkId; + yaffs_ExtendedTags newTags; + yaffs_ExtendedTags oldTags; + YCHAR *alias = NULL; -int yaffs_DeleteObject(yaffs_Object *obj) -{ -int retVal = -1; - switch (obj->variantType) { - case YAFFS_OBJECT_TYPE_FILE: - retVal = yaffs_DeleteFile(obj); - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - if(!ylist_empty(&obj->variant.directoryVariant.dirty)){ - T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId)); - ylist_del_init(&obj->variant.directoryVariant.dirty); - } - return yaffs_DeleteDirectory(obj); - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - retVal = yaffs_DeleteSymLink(obj); - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - retVal = yaffs_DeleteHardLink(obj); - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - retVal = yaffs_DoGenericObjectDeletion(obj); - break; - case YAFFS_OBJECT_TYPE_UNKNOWN: - retVal = 0; - break; /* should not happen. */ - } + __u8 *buffer = NULL; + YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1]; - return retVal; -} + yaffs_ObjectHeader *oh = NULL; -static int yaffs_UnlinkWorker(yaffs_Object *obj) -{ + yaffs_strcpy(oldName, _Y("silly old name")); - int immediateDeletion = 0; - if (!obj->myInode) - immediateDeletion = 1; + if (!in->fake || + in == dev->rootDir || /* The rootDir should also be saved */ + force || xmod) { - if(obj) - yaffs_UpdateParent(obj->parent); + yaffs_CheckGarbageCollection(dev,0); + yaffs_CheckObjectDetailsLoaded(in); - if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) { - return yaffs_DeleteHardLink(obj); - } else if (!ylist_empty(&obj->hardLinks)) { - /* Curve ball: We're unlinking an object that has a hardlink. - * - * This problem arises because we are not strictly following - * The Linux link/inode model. - * - * We can't really delete the object. - * Instead, we do the following: - * - Select a hardlink. - * - Unhook it from the hard links - * - Move it from its parent directory (so that the rename can work) - * - Rename the object to the hardlink's name. - * - Delete the hardlink - */ + buffer = yaffs_GetTempBuffer(in->myDev, __LINE__); + oh = (yaffs_ObjectHeader *) buffer; - yaffs_Object *hl; - yaffs_Object *parent; - int retVal; - YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; + prevChunkId = in->hdrChunk; - hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks); + if (prevChunkId > 0) { + result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId, + buffer, &oldTags); - yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1); - parent = hl->parent; + yaffs_VerifyObjectHeader(in, oh, &oldTags, 0); - ylist_del_init(&hl->hardLinks); + memcpy(oldName, oh->name, sizeof(oh->name)); + memset(buffer, 0xFF, sizeof(yaffs_ObjectHeader)); + } else + memset(buffer, 0xFF, dev->nDataBytesPerChunk); - yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl); + oh->type = in->variantType; + oh->yst_mode = in->yst_mode; + oh->shadowsObject = oh->inbandShadowsObject = shadows; - retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0); +#ifdef CONFIG_YAFFS_WINCE + oh->win_atime[0] = in->win_atime[0]; + oh->win_ctime[0] = in->win_ctime[0]; + oh->win_mtime[0] = in->win_mtime[0]; + oh->win_atime[1] = in->win_atime[1]; + oh->win_ctime[1] = in->win_ctime[1]; + oh->win_mtime[1] = in->win_mtime[1]; +#else + oh->yst_uid = in->yst_uid; + oh->yst_gid = in->yst_gid; + oh->yst_atime = in->yst_atime; + oh->yst_mtime = in->yst_mtime; + oh->yst_ctime = in->yst_ctime; + oh->yst_rdev = in->yst_rdev; +#endif + if (in->parent) + oh->parentObjectId = in->parent->objectId; + else + oh->parentObjectId = 0; - if (retVal == YAFFS_OK) - retVal = yaffs_DoGenericObjectDeletion(hl); + if (name && *name) { + memset(oh->name, 0, sizeof(oh->name)); + yaffs_LoadObjectHeaderFromName(dev,oh->name,name); + } else if (prevChunkId > 0) + memcpy(oh->name, oldName, sizeof(oh->name)); + else + memset(oh->name, 0, sizeof(oh->name)); - return retVal; + oh->isShrink = isShrink; - } else if (immediateDeletion) { - switch (obj->variantType) { + switch (in->variantType) { + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* Should not happen */ + break; case YAFFS_OBJECT_TYPE_FILE: - return yaffs_DeleteFile(obj); + oh->fileSize = + (oh->parentObjectId == YAFFS_OBJECTID_DELETED + || oh->parentObjectId == + YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant. + fileVariant.fileSize; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + oh->equivalentObjectId = + in->variant.hardLinkVariant.equivalentObjectId; + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + /* Do nothing */ break; case YAFFS_OBJECT_TYPE_DIRECTORY: - ylist_del_init(&obj->variant.directoryVariant.dirty); - return yaffs_DeleteDirectory(obj); + /* Do nothing */ break; case YAFFS_OBJECT_TYPE_SYMLINK: - return yaffs_DeleteSymLink(obj); - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - return yaffs_DoGenericObjectDeletion(obj); + alias = in->variant.symLinkVariant.alias; + if(!alias) + alias = _Y("no alias"); + yaffs_strncpy(oh->alias, + alias, + YAFFS_MAX_ALIAS_LENGTH); + oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; break; - case YAFFS_OBJECT_TYPE_HARDLINK: - case YAFFS_OBJECT_TYPE_UNKNOWN: - default: - return YAFFS_FAIL; } - } else if(yaffs_IsNonEmptyDirectory(obj)) - return YAFFS_FAIL; - else - return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir, - _Y("unlinked"), 0, 0); -} - -static int yaffs_UnlinkObject(yaffs_Object *obj) -{ - - if (obj && obj->unlinkAllowed) - return yaffs_UnlinkWorker(obj); + /* process any xattrib modifications */ + if(xmod) + yaffs_ApplyXMod(in, (char *)buffer, xmod); - return YAFFS_FAIL; -} -int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name) -{ - yaffs_Object *obj; + /* Tags */ + yaffs_InitialiseTags(&newTags); + in->serial++; + newTags.chunkId = 0; + newTags.objectId = in->objectId; + newTags.serialNumber = in->serial; - obj = yaffs_FindObjectByName(dir, name); - return yaffs_UnlinkObject(obj); -} + /* Add extra info for file header */ -/*----------------------- Initialisation Scanning ---------------------- */ + newTags.extraHeaderInfoAvailable = 1; + newTags.extraParentObjectId = oh->parentObjectId; + newTags.extraFileLength = oh->fileSize; + newTags.extraIsShrinkHeader = oh->isShrink; + newTags.extraEquivalentObjectId = oh->equivalentObjectId; + newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0; + newTags.extraObjectType = in->variantType; -static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId, - int backwardScanning) -{ - yaffs_Object *obj; + yaffs_VerifyObjectHeader(in, oh, &newTags, 1); - if (!backwardScanning) { - /* Handle YAFFS1 forward scanning case - * For YAFFS1 we always do the deletion - */ + /* Create new chunk in NAND */ + newChunkId = + yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags, + (prevChunkId > 0) ? 1 : 0); - } else { - /* Handle YAFFS2 case (backward scanning) - * If the shadowed object exists then ignore. - */ - obj = yaffs_FindObjectByNumber(dev, objId); - if(obj) - return; - } + if (newChunkId >= 0) { - /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc. - * We put it in unlinked dir to be cleaned up after the scanning - */ - obj = - yaffs_FindOrCreateObjectByNumber(dev, objId, - YAFFS_OBJECT_TYPE_FILE); - if (!obj) - return; - obj->isShadowed = 1; - yaffs_AddObjectToDirectory(dev->unlinkedDir, obj); - obj->variant.fileVariant.shrinkSize = 0; - obj->valid = 1; /* So that we don't read any other info for this file */ + in->hdrChunk = newChunkId; -} + if (prevChunkId > 0) { + yaffs_DeleteChunk(dev, prevChunkId, 1, + __LINE__); + } -typedef struct { - int seq; - int block; -} yaffs_BlockIndex; + if (!yaffs_ObjectHasCachedWriteData(in)) + in->dirty = 0; + /* If this was a shrink, then mark the block that the chunk lives on */ + if (isShrink) { + bi = yaffs_GetBlockInfo(in->myDev, + newChunkId / in->myDev->param.nChunksPerBlock); + bi->hasShrinkHeader = 1; + } -static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList) -{ - yaffs_Object *hl; - yaffs_Object *in; + } - while (hardList) { - hl = hardList; - hardList = (yaffs_Object *) (hardList->hardLinks.next); + retVal = newChunkId; - in = yaffs_FindObjectByNumber(dev, - hl->variant.hardLinkVariant. - equivalentObjectId); + } - if (in) { - /* Add the hardlink pointers */ - hl->variant.hardLinkVariant.equivalentObject = in; - ylist_add(&hl->hardLinks, &in->hardLinks); - } else { - /* Todo Need to report/handle this better. - * Got a problem... hardlink to a non-existant object - */ - hl->variant.hardLinkVariant.equivalentObject = NULL; - YINIT_LIST_HEAD(&hl->hardLinks); + if (buffer) + yaffs_ReleaseTempBuffer(dev, buffer, __LINE__); - } - } + return retVal; } +/*------------------------ Short Operations Cache ---------------------------------------- + * In many situations where there is no high level buffering (eg WinCE) a lot of + * reads might be short sequential reads, and a lot of writes may be short + * sequential writes. eg. scanning/writing a jpeg file. + * In these cases, a short read/write cache can provide a huge perfomance benefit + * with dumb-as-a-rock code. + * In Linux, the page cache provides read buffering aand the short op cache provides write + * buffering. + * + * There are a limited number (~10) of cache chunks per device so that we don't + * need a very intelligent search. + */ + +static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj) +{ + yaffs_Device *dev = obj->myDev; + int i; + yaffs_ChunkCache *cache; + int nCaches = obj->myDev->param.nShortOpCaches; + for (i = 0; i < nCaches; i++) { + cache = &dev->srCache[i]; + if (cache->object == obj && + cache->dirty) + return 1; + } + return 0; +} -static int ybicmp(const void *a, const void *b) +static void yaffs_FlushFilesChunkCache(yaffs_Object *obj) { - register int aseq = ((yaffs_BlockIndex *)a)->seq; - register int bseq = ((yaffs_BlockIndex *)b)->seq; - register int ablock = ((yaffs_BlockIndex *)a)->block; - register int bblock = ((yaffs_BlockIndex *)b)->block; - if (aseq == bseq) - return ablock - bblock; - else - return aseq - bseq; -} + yaffs_Device *dev = obj->myDev; + int lowest = -99; /* Stop compiler whining. */ + int i; + yaffs_ChunkCache *cache; + int chunkWritten = 0; + int nCaches = obj->myDev->param.nShortOpCaches; + + if (nCaches > 0) { + do { + cache = NULL; + /* Find the dirty cache for this object with the lowest chunk id. */ + for (i = 0; i < nCaches; i++) { + if (dev->srCache[i].object == obj && + dev->srCache[i].dirty) { + if (!cache + || dev->srCache[i].chunkId < + lowest) { + cache = &dev->srCache[i]; + lowest = cache->chunkId; + } + } + } -struct yaffs_ShadowFixerStruct { - int objectId; - int shadowedId; - struct yaffs_ShadowFixerStruct *next; -}; + if (cache && !cache->locked) { + /* Write it out and free it up */ + chunkWritten = + yaffs_WriteChunkDataToObject(cache->object, + cache->chunkId, + cache->data, + cache->nBytes, + 1); + cache->dirty = 0; + cache->object = NULL; + } -static void yaffs_StripDeletedObjects(yaffs_Device *dev) -{ - /* - * Sort out state of unlinked and deleted objects after scanning. - */ - struct ylist_head *i; - struct ylist_head *n; - yaffs_Object *l; + } while (cache && chunkWritten > 0); - /* Soft delete all the unlinked files */ - ylist_for_each_safe(i, n, - &dev->unlinkedDir->variant.directoryVariant.children) { - if (i) { - l = ylist_entry(i, yaffs_Object, siblings); - yaffs_DeleteObject(l); - } - } + if (cache) { + /* Hoosterman, disk full while writing cache out. */ + T(YAFFS_TRACE_ERROR, + (TSTR("yaffs tragedy: no space during cache write" TENDSTR))); - ylist_for_each_safe(i, n, - &dev->deletedDir->variant.directoryVariant.children) { - if (i) { - l = ylist_entry(i, yaffs_Object, siblings); - yaffs_DeleteObject(l); } } -} - -/* - * This code iterates through all the objects making sure that they are rooted. - * Any unrooted objects are re-rooted in lost+found. - * An object needs to be in one of: - * - Directly under deleted, unlinked - * - Directly or indirectly under root. - * - * Note: - * This code assumes that we don't ever change the current relationships between - * directories: - * rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL - * lostNfound->parent == rootDir +} + +/*yaffs_FlushEntireDeviceCache(dev) + * * - * This fixes the problem where directories might have inadvertently been deleted - * leaving the object "hanging" without being rooted in the directory tree. */ - -static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj) -{ - return (obj == dev->deletedDir || - obj == dev->unlinkedDir|| - obj == dev->rootDir); -} -static void yaffs_FixHangingObjects(yaffs_Device *dev) +void yaffs_FlushEntireDeviceCache(yaffs_Device *dev) { yaffs_Object *obj; - yaffs_Object *parent; + int nCaches = dev->param.nShortOpCaches; int i; - struct ylist_head *lh; - struct ylist_head *n; - int depthLimit; - int hanging; - - /* Iterate through the objects in each hash entry, - * looking at each object. - * Make sure it is rooted. + /* Find a dirty object in the cache and flush it... + * until there are no further dirty objects. */ + do { + obj = NULL; + for (i = 0; i < nCaches && !obj; i++) { + if (dev->srCache[i].object && + dev->srCache[i].dirty) + obj = dev->srCache[i].object; - for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { - ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) { - if (lh) { - obj = ylist_entry(lh, yaffs_Object, hashLink); - parent= obj->parent; - - if(yaffs_HasNULLParent(dev,obj)){ - /* These directories are not hanging */ - hanging = 0; - } - else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) - hanging = 1; - else if(yaffs_HasNULLParent(dev,parent)) - hanging = 0; - else { - /* - * Need to follow the parent chain to see if it is hanging. - */ - hanging = 0; - depthLimit=100; - - while(parent != dev->rootDir && - parent->parent && - parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY && - depthLimit > 0){ - parent = parent->parent; - depthLimit--; - } - if(parent != dev->rootDir) - hanging = 1; - } - if(hanging){ - T(YAFFS_TRACE_SCAN, - (TSTR("Hanging object %d moved to lost and found" TENDSTR), - obj->objectId)); - yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj); - } - } } - } + if (obj) + yaffs_FlushFilesChunkCache(obj); + + } while (obj); + } -/* - * Delete directory contents for cleaning up lost and found. +/* Grab us a cache chunk for use. + * First look for an empty one. + * Then look for the least recently used non-dirty one. + * Then look for the least recently used dirty one...., flush and look again. */ -static void yaffs_DeleteDirectoryContents(yaffs_Object *dir) +static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev) { - yaffs_Object *obj; - struct ylist_head *lh; - struct ylist_head *n; - - if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) - YBUG(); - - ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) { - if (lh) { - obj = ylist_entry(lh, yaffs_Object, siblings); - if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) - yaffs_DeleteDirectoryContents(obj); - - T(YAFFS_TRACE_SCAN, - (TSTR("Deleting lost_found object %d" TENDSTR), - obj->objectId)); + int i; - /* Need to use UnlinkObject since Delete would not handle - * hardlinked objects correctly. - */ - yaffs_UnlinkObject(obj); + if (dev->param.nShortOpCaches > 0) { + for (i = 0; i < dev->param.nShortOpCaches; i++) { + if (!dev->srCache[i].object) + return &dev->srCache[i]; } } - -} -static void yaffs_EmptyLostAndFound(yaffs_Device *dev) -{ - yaffs_DeleteDirectoryContents(dev->lostNFoundDir); + return NULL; } -static int yaffs_Scan(yaffs_Device *dev) +static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev) { - yaffs_ExtendedTags tags; - int blk; - int blockIterator; - int startIterator; - int endIterator; - int result; - - int chunk; - int c; - int deleted; - yaffs_BlockState state; - yaffs_Object *hardList = NULL; - yaffs_BlockInfo *bi; - __u32 sequenceNumber; - yaffs_ObjectHeader *oh; - yaffs_Object *in; - yaffs_Object *parent; - - int alloc_failed = 0; + yaffs_ChunkCache *cache; + yaffs_Object *theObj; + int usage; + int i; + int pushout; - struct yaffs_ShadowFixerStruct *shadowFixerList = NULL; + if (dev->param.nShortOpCaches > 0) { + /* Try find a non-dirty one... */ + cache = yaffs_GrabChunkCacheWorker(dev); - __u8 *chunkData; + if (!cache) { + /* They were all dirty, find the last recently used object and flush + * its cache, then find again. + * NB what's here is not very accurate, we actually flush the object + * the last recently used page. + */ + /* With locking we can't assume we can use entry zero */ + theObj = NULL; + usage = -1; + cache = NULL; + pushout = -1; - T(YAFFS_TRACE_SCAN, - (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR), - dev->internalStartBlock, dev->internalEndBlock)); + for (i = 0; i < dev->param.nShortOpCaches; i++) { + if (dev->srCache[i].object && + !dev->srCache[i].locked && + (dev->srCache[i].lastUse < usage || !cache)) { + usage = dev->srCache[i].lastUse; + theObj = dev->srCache[i].object; + cache = &dev->srCache[i]; + pushout = i; + } + } - chunkData = yaffs_GetTempBuffer(dev, __LINE__); + if (!cache || cache->dirty) { + /* Flush and try again */ + yaffs_FlushFilesChunkCache(theObj); + cache = yaffs_GrabChunkCacheWorker(dev); + } - dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER; + } + return cache; + } else + return NULL; - /* Scan all the blocks to determine their state */ - bi = dev->blockInfo; - for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) { - yaffs_ClearChunkBits(dev, blk); - bi->pagesInUse = 0; - bi->softDeletions = 0; +} - yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber); +/* Find a cached chunk */ +static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, + int chunkId) +{ + yaffs_Device *dev = obj->myDev; + int i; + if (dev->param.nShortOpCaches > 0) { + for (i = 0; i < dev->param.nShortOpCaches; i++) { + if (dev->srCache[i].object == obj && + dev->srCache[i].chunkId == chunkId) { + dev->cacheHits++; - bi->blockState = state; - bi->sequenceNumber = sequenceNumber; + return &dev->srCache[i]; + } + } + } + return NULL; +} - if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK) - bi->blockState = state = YAFFS_BLOCK_STATE_DEAD; +/* Mark the chunk for the least recently used algorithym */ +static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, + int isAWrite) +{ - T(YAFFS_TRACE_SCAN_DEBUG, - (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk, - state, sequenceNumber)); + if (dev->param.nShortOpCaches > 0) { + if (dev->srLastUse < 0 || dev->srLastUse > 100000000) { + /* Reset the cache usages */ + int i; + for (i = 1; i < dev->param.nShortOpCaches; i++) + dev->srCache[i].lastUse = 0; - if (state == YAFFS_BLOCK_STATE_DEAD) { - T(YAFFS_TRACE_BAD_BLOCKS, - (TSTR("block %d is bad" TENDSTR), blk)); - } else if (state == YAFFS_BLOCK_STATE_EMPTY) { - T(YAFFS_TRACE_SCAN_DEBUG, - (TSTR("Block empty " TENDSTR))); - dev->nErasedBlocks++; - dev->nFreeChunks += dev->param.nChunksPerBlock; + dev->srLastUse = 0; } - bi++; - } - startIterator = dev->internalStartBlock; - endIterator = dev->internalEndBlock; - - /* For each block.... */ - for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator; - blockIterator++) { + dev->srLastUse++; - YYIELD(); + cache->lastUse = dev->srLastUse; - YYIELD(); + if (isAWrite) + cache->dirty = 1; + } +} - blk = blockIterator; +/* Invalidate a single cache page. + * Do this when a whole page gets written, + * ie the short cache for this page is no longer valid. + */ +static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId) +{ + if (object->myDev->param.nShortOpCaches > 0) { + yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId); - bi = yaffs_GetBlockInfo(dev, blk); - state = bi->blockState; + if (cache) + cache->object = NULL; + } +} - deleted = 0; +/* Invalidate all the cache pages associated with this object + * Do this whenever ther file is deleted or resized. + */ +static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in) +{ + int i; + yaffs_Device *dev = in->myDev; - /* For each chunk in each block that needs scanning....*/ - for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock && - state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) { - /* Read the tags and decide what to do */ - chunk = blk * dev->param.nChunksPerBlock + c; + if (dev->param.nShortOpCaches > 0) { + /* Invalidate it. */ + for (i = 0; i < dev->param.nShortOpCaches; i++) { + if (dev->srCache[i].object == in) + dev->srCache[i].object = NULL; + } + } +} - result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL, - &tags); - /* Let's have a good look at this chunk... */ +/*--------------------- File read/write ------------------------ + * Read and write have very similar structures. + * In general the read/write has three parts to it + * An incomplete chunk to start with (if the read/write is not chunk-aligned) + * Some complete chunks + * An incomplete chunk to end off with + * + * Curve-balls: the first chunk might also be the last chunk. + */ - if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) { - /* YAFFS1 only... - * A deleted chunk - */ - deleted++; - dev->nFreeChunks++; - /*T((" %d %d deleted\n",blk,c)); */ - } else if (!tags.chunkUsed) { - /* An unassigned chunk in the block - * This means that either the block is empty or - * this is the one being allocated from - */ +int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset, + int nBytes) +{ - if (c == 0) { - /* We're looking at the first chunk in the block so the block is unused */ - state = YAFFS_BLOCK_STATE_EMPTY; - dev->nErasedBlocks++; - } else { - /* this is the block being allocated from */ - T(YAFFS_TRACE_SCAN, - (TSTR - (" Allocating from %d %d" TENDSTR), - blk, c)); - state = YAFFS_BLOCK_STATE_ALLOCATING; - dev->allocationBlock = blk; - dev->allocationPage = c; - dev->allocationBlockFinder = blk; - /* Set block finder here to encourage the allocator to go forth from here. */ + int chunk; + __u32 start; + int nToCopy; + int n = nBytes; + int nDone = 0; + yaffs_ChunkCache *cache; - } + yaffs_Device *dev; - dev->nFreeChunks += (dev->param.nChunksPerBlock - c); - } else if (tags.chunkId > 0) { - /* chunkId > 0 so it is a data chunk... */ - unsigned int endpos; + dev = in->myDev; - yaffs_SetChunkBit(dev, blk, c); - bi->pagesInUse++; + while (n > 0) { + /* chunk = offset / dev->nDataBytesPerChunk + 1; */ + /* start = offset % dev->nDataBytesPerChunk; */ + yaffs_AddrToChunk(dev, offset, &chunk, &start); + chunk++; - in = yaffs_FindOrCreateObjectByNumber(dev, - tags. - objectId, - YAFFS_OBJECT_TYPE_FILE); - /* PutChunkIntoFile checks for a clash (two data chunks with - * the same chunkId). - */ + /* OK now check for the curveball where the start and end are in + * the same chunk. + */ + if ((start + n) < dev->nDataBytesPerChunk) + nToCopy = n; + else + nToCopy = dev->nDataBytesPerChunk - start; - if (!in) - alloc_failed = 1; + cache = yaffs_FindChunkCache(in, chunk); - if (in) { - if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1)) - alloc_failed = 1; - } + /* If the chunk is already in the cache or it is less than a whole chunk + * or we're using inband tags then use the cache (if there is caching) + * else bypass the cache. + */ + if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) { + if (dev->param.nShortOpCaches > 0) { - endpos = - (tags.chunkId - 1) * dev->nDataBytesPerChunk + - tags.byteCount; - if (in && - in->variantType == YAFFS_OBJECT_TYPE_FILE - && in->variant.fileVariant.scannedFileSize < - endpos) { - in->variant.fileVariant. - scannedFileSize = endpos; - if (!dev->param.useHeaderFileSize) { - in->variant.fileVariant. - fileSize = - in->variant.fileVariant. - scannedFileSize; - } + /* If we can't find the data in the cache, then load it up. */ + if (!cache) { + cache = yaffs_GrabChunkCache(in->myDev); + cache->object = in; + cache->chunkId = chunk; + cache->dirty = 0; + cache->locked = 0; + yaffs_ReadChunkDataFromObject(in, chunk, + cache-> + data); + cache->nBytes = 0; } - /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */ - } else { - /* chunkId == 0, so it is an ObjectHeader. - * Thus, we read in the object header and make the object - */ - yaffs_SetChunkBit(dev, blk, c); - bi->pagesInUse++; - result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, - chunkData, - NULL); + yaffs_UseChunkCache(dev, cache, 0); - oh = (yaffs_ObjectHeader *) chunkData; + cache->locked = 1; - in = yaffs_FindObjectByNumber(dev, - tags.objectId); - if (in && in->variantType != oh->type) { - /* This should not happen, but somehow - * Wev'e ended up with an objectId that has been reused but not yet - * deleted, and worse still it has changed type. Delete the old object. - */ - yaffs_DeleteObject(in); + memcpy(buffer, &cache->data[start], nToCopy); - in = 0; - } + cache->locked = 0; + } else { + /* Read into the local buffer then copy..*/ - in = yaffs_FindOrCreateObjectByNumber(dev, - tags. - objectId, - oh->type); + __u8 *localBuffer = + yaffs_GetTempBuffer(dev, __LINE__); + yaffs_ReadChunkDataFromObject(in, chunk, + localBuffer); - if (!in) - alloc_failed = 1; + memcpy(buffer, &localBuffer[start], nToCopy); - if (in && oh->shadowsObject > 0) { - struct yaffs_ShadowFixerStruct *fixer; - fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct)); - if (fixer) { - fixer->next = shadowFixerList; - shadowFixerList = fixer; - fixer->objectId = tags.objectId; - fixer->shadowedId = oh->shadowsObject; - } + yaffs_ReleaseTempBuffer(dev, localBuffer, + __LINE__); + } - } + } else { - if (in && in->valid) { - /* We have already filled this one. We have a duplicate and need to resolve it. */ + /* A full chunk. Read directly into the supplied buffer. */ + yaffs_ReadChunkDataFromObject(in, chunk, buffer); - unsigned existingSerial = in->serial; - unsigned newSerial = tags.serialNumber; + } - if (((existingSerial + 1) & 3) == newSerial) { - /* Use new one - destroy the exisiting one */ - yaffs_DeleteChunk(dev, - in->hdrChunk, - 1, __LINE__); - in->valid = 0; - } else { - /* Use existing - destroy this one. */ - yaffs_DeleteChunk(dev, chunk, 1, - __LINE__); - } - } + n -= nToCopy; + offset += nToCopy; + buffer += nToCopy; + nDone += nToCopy; - if (in && !in->valid && - (tags.objectId == YAFFS_OBJECTID_ROOT || - tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) { - /* We only load some info, don't fiddle with directory structure */ - in->valid = 1; - in->variantType = oh->type; + } - in->yst_mode = oh->yst_mode; -#ifdef CONFIG_YAFFS_WINCE - in->win_atime[0] = oh->win_atime[0]; - in->win_ctime[0] = oh->win_ctime[0]; - in->win_mtime[0] = oh->win_mtime[0]; - in->win_atime[1] = oh->win_atime[1]; - in->win_ctime[1] = oh->win_ctime[1]; - in->win_mtime[1] = oh->win_mtime[1]; -#else - in->yst_uid = oh->yst_uid; - in->yst_gid = oh->yst_gid; - in->yst_atime = oh->yst_atime; - in->yst_mtime = oh->yst_mtime; - in->yst_ctime = oh->yst_ctime; - in->yst_rdev = oh->yst_rdev; -#endif - in->hdrChunk = chunk; - in->serial = tags.serialNumber; + return nDone; +} - } else if (in && !in->valid) { - /* we need to load this info */ +int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset, + int nBytes, int writeThrough) +{ - in->valid = 1; - in->variantType = oh->type; + int chunk; + __u32 start; + int nToCopy; + int n = nBytes; + int nDone = 0; + int nToWriteBack; + int startOfWrite = offset; + int chunkWritten = 0; + __u32 nBytesRead; + __u32 chunkStart; - in->yst_mode = oh->yst_mode; -#ifdef CONFIG_YAFFS_WINCE - in->win_atime[0] = oh->win_atime[0]; - in->win_ctime[0] = oh->win_ctime[0]; - in->win_mtime[0] = oh->win_mtime[0]; - in->win_atime[1] = oh->win_atime[1]; - in->win_ctime[1] = oh->win_ctime[1]; - in->win_mtime[1] = oh->win_mtime[1]; -#else - in->yst_uid = oh->yst_uid; - in->yst_gid = oh->yst_gid; - in->yst_atime = oh->yst_atime; - in->yst_mtime = oh->yst_mtime; - in->yst_ctime = oh->yst_ctime; - in->yst_rdev = oh->yst_rdev; -#endif - in->hdrChunk = chunk; - in->serial = tags.serialNumber; + yaffs_Device *dev; - yaffs_SetObjectName(in, oh->name); - in->dirty = 0; + dev = in->myDev; - /* directory stuff... - * hook up to parent - */ + while (n > 0 && chunkWritten >= 0) { + yaffs_AddrToChunk(dev, offset, &chunk, &start); - parent = - yaffs_FindOrCreateObjectByNumber - (dev, oh->parentObjectId, - YAFFS_OBJECT_TYPE_DIRECTORY); - if (!parent) - alloc_failed = 1; - if (parent && parent->variantType == - YAFFS_OBJECT_TYPE_UNKNOWN) { - /* Set up as a directory */ - parent->variantType = - YAFFS_OBJECT_TYPE_DIRECTORY; - YINIT_LIST_HEAD(&parent->variant. - directoryVariant. - children); - } else if (!parent || parent->variantType != - YAFFS_OBJECT_TYPE_DIRECTORY) { - /* Hoosterman, another problem.... - * We're trying to use a non-directory as a directory - */ + if (chunk * dev->nDataBytesPerChunk + start != offset || + start >= dev->nDataBytesPerChunk) { + T(YAFFS_TRACE_ERROR, ( + TSTR("AddrToChunk of offset %d gives chunk %d start %d" + TENDSTR), + (int)offset, chunk, start)); + } + chunk++; /* File pos to chunk in file offset */ - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." - TENDSTR))); - parent = dev->lostNFoundDir; - } + /* OK now check for the curveball where the start and end are in + * the same chunk. + */ - yaffs_AddObjectToDirectory(parent, in); + if ((start + n) < dev->nDataBytesPerChunk) { + nToCopy = n; - if (0 && (parent == dev->deletedDir || - parent == dev->unlinkedDir)) { - in->deleted = 1; /* If it is unlinked at start up then it wants deleting */ - dev->nDeletedFiles++; - } - /* Note re hardlinks. - * Since we might scan a hardlink before its equivalent object is scanned - * we put them all in a list. - * After scanning is complete, we should have all the objects, so we run through this - * list and fix up all the chains. - */ + /* Now folks, to calculate how many bytes to write back.... + * If we're overwriting and not writing to then end of file then + * we need to write back as much as was there before. + */ - switch (in->variantType) { - case YAFFS_OBJECT_TYPE_UNKNOWN: - /* Todo got a problem */ - break; - case YAFFS_OBJECT_TYPE_FILE: - if (dev->param.useHeaderFileSize) - - in->variant.fileVariant. - fileSize = - oh->fileSize; - - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - in->variant.hardLinkVariant. - equivalentObjectId = - oh->equivalentObjectId; - in->hardLinks.next = - (struct ylist_head *) - hardList; - hardList = in; - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - /* Do nothing */ - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - /* Do nothing */ - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - in->variant.symLinkVariant.alias = - yaffs_CloneString(oh->alias); - if (!in->variant.symLinkVariant.alias) - alloc_failed = 1; - break; - } + chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk); - } - } - } + if (chunkStart > in->variant.fileVariant.fileSize) + nBytesRead = 0; /* Past end of file */ + else + nBytesRead = in->variant.fileVariant.fileSize - chunkStart; - if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) { - /* If we got this far while scanning, then the block is fully allocated.*/ - state = YAFFS_BLOCK_STATE_FULL; - } + if (nBytesRead > dev->nDataBytesPerChunk) + nBytesRead = dev->nDataBytesPerChunk; - if (state == YAFFS_BLOCK_STATE_ALLOCATING) { - /* If the block was partially allocated then treat it as fully allocated.*/ - state = YAFFS_BLOCK_STATE_FULL; - dev->allocationBlock = -1; - } + nToWriteBack = + (nBytesRead > + (start + n)) ? nBytesRead : (start + n); - bi->blockState = state; + if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk) + YBUG(); - /* Now let's see if it was dirty */ - if (bi->pagesInUse == 0 && - !bi->hasShrinkHeader && - bi->blockState == YAFFS_BLOCK_STATE_FULL) { - yaffs_BlockBecameDirty(dev, blk); + } else { + nToCopy = dev->nDataBytesPerChunk - start; + nToWriteBack = dev->nDataBytesPerChunk; } - } + if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) { + /* An incomplete start or end chunk (or maybe both start and end chunk), + * or we're using inband tags, so we want to use the cache buffers. + */ + if (dev->param.nShortOpCaches > 0) { + yaffs_ChunkCache *cache; + /* If we can't find the data in the cache, then load the cache */ + cache = yaffs_FindChunkCache(in, chunk); + if (!cache + && yaffs_CheckSpaceForAllocation(dev, 1)) { + cache = yaffs_GrabChunkCache(dev); + cache->object = in; + cache->chunkId = chunk; + cache->dirty = 0; + cache->locked = 0; + yaffs_ReadChunkDataFromObject(in, chunk, + cache->data); + } else if (cache && + !cache->dirty && + !yaffs_CheckSpaceForAllocation(dev, 1)) { + /* Drop the cache if it was a read cache item and + * no space check has been made for it. + */ + cache = NULL; + } - /* Ok, we've done all the scanning. - * Fix up the hard link chains. - * We should now have scanned all the objects, now it's time to add these - * hardlinks. - */ + if (cache) { + yaffs_UseChunkCache(dev, cache, 1); + cache->locked = 1; - yaffs_HardlinkFixup(dev, hardList); - /* Fix up any shadowed objects */ - { - struct yaffs_ShadowFixerStruct *fixer; - yaffs_Object *obj; + memcpy(&cache->data[start], buffer, + nToCopy); - while (shadowFixerList) { - fixer = shadowFixerList; - shadowFixerList = fixer->next; - /* Complete the rename transaction by deleting the shadowed object - * then setting the object header to unshadowed. - */ - obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId); - if (obj) - yaffs_DeleteObject(obj); - obj = yaffs_FindObjectByNumber(dev, fixer->objectId); + cache->locked = 0; + cache->nBytes = nToWriteBack; - if (obj) - yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0, NULL); + if (writeThrough) { + chunkWritten = + yaffs_WriteChunkDataToObject + (cache->object, + cache->chunkId, + cache->data, cache->nBytes, + 1); + cache->dirty = 0; + } - YFREE(fixer); - } - } + } else { + chunkWritten = -1; /* fail the write */ + } + } else { + /* An incomplete start or end chunk (or maybe both start and end chunk) + * Read into the local buffer then copy, then copy over and write back. + */ - yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__); + __u8 *localBuffer = + yaffs_GetTempBuffer(dev, __LINE__); - if (alloc_failed) - return YAFFS_FAIL; + yaffs_ReadChunkDataFromObject(in, chunk, + localBuffer); - T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR))); - return YAFFS_OK; -} + memcpy(&localBuffer[start], buffer, nToCopy); -static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in) -{ - __u8 *chunkData; - yaffs_ObjectHeader *oh; - yaffs_Device *dev; - yaffs_ExtendedTags tags; - int result; - int alloc_failed = 0; + chunkWritten = + yaffs_WriteChunkDataToObject(in, chunk, + localBuffer, + nToWriteBack, + 0); - if (!in) - return; + yaffs_ReleaseTempBuffer(dev, localBuffer, + __LINE__); - dev = in->myDev; + } -#if 0 - T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR), - in->objectId, - in->lazyLoaded ? "not yet" : "already")); -#endif + } else { + /* A full chunk. Write directly from the supplied buffer. */ - if (in->lazyLoaded && in->hdrChunk > 0) { - in->lazyLoaded = 0; - chunkData = yaffs_GetTempBuffer(dev, __LINE__); - result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags); - oh = (yaffs_ObjectHeader *) chunkData; - in->yst_mode = oh->yst_mode; -#ifdef CONFIG_YAFFS_WINCE - in->win_atime[0] = oh->win_atime[0]; - in->win_ctime[0] = oh->win_ctime[0]; - in->win_mtime[0] = oh->win_mtime[0]; - in->win_atime[1] = oh->win_atime[1]; - in->win_ctime[1] = oh->win_ctime[1]; - in->win_mtime[1] = oh->win_mtime[1]; -#else - in->yst_uid = oh->yst_uid; - in->yst_gid = oh->yst_gid; - in->yst_atime = oh->yst_atime; - in->yst_mtime = oh->yst_mtime; - in->yst_ctime = oh->yst_ctime; - in->yst_rdev = oh->yst_rdev; + chunkWritten = + yaffs_WriteChunkDataToObject(in, chunk, buffer, + dev->nDataBytesPerChunk, + 0); -#endif - yaffs_SetObjectName(in, oh->name); + /* Since we've overwritten the cached data, we better invalidate it. */ + yaffs_InvalidateChunkCache(in, chunk); + } - if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) { - in->variant.symLinkVariant.alias = - yaffs_CloneString(oh->alias); - if (!in->variant.symLinkVariant.alias) - alloc_failed = 1; /* Not returned to caller */ + if (chunkWritten >= 0) { + n -= nToCopy; + offset += nToCopy; + buffer += nToCopy; + nDone += nToCopy; } - yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__); } + + /* Update file object */ + + if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) + in->variant.fileVariant.fileSize = (startOfWrite + nDone); + + in->dirty = 1; + + return nDone; } -static int yaffs_ScanBackwards(yaffs_Device *dev) +int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset, + int nBytes, int writeThrough) { - yaffs_ExtendedTags tags; - int blk; - int blockIterator; - int startIterator; - int endIterator; - int nBlocksToScan = 0; - - int chunk; - int result; - int c; - int deleted; - yaffs_BlockState state; - yaffs_Object *hardList = NULL; - yaffs_BlockInfo *bi; - __u32 sequenceNumber; - yaffs_ObjectHeader *oh; - yaffs_Object *in; - yaffs_Object *parent; - int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1; - int itsUnlinked; - __u8 *chunkData; + yaffs2_HandleHole(in,offset); + return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough); +} - int fileSize; - int isShrink; - int foundChunksInBlock; - int equivalentObjectId; - int alloc_failed = 0; - yaffs_BlockIndex *blockIndex = NULL; - int altBlockIndex = 0; +/* ---------------------- File resizing stuff ------------------ */ - if (!dev->param.isYaffs2) { - T(YAFFS_TRACE_SCAN, - (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR))); - return YAFFS_FAIL; - } +static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize) +{ - T(YAFFS_TRACE_SCAN, - (TSTR - ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..." - TENDSTR), dev->internalStartBlock, dev->internalEndBlock)); + yaffs_Device *dev = in->myDev; + int oldFileSize = in->variant.fileVariant.fileSize; + int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk; - dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER; + int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) / + dev->nDataBytesPerChunk; + int i; + int chunkId; - blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex)); + /* Delete backwards so that we don't end up with holes if + * power is lost part-way through the operation. + */ + for (i = lastDel; i >= startDel; i--) { + /* NB this could be optimised somewhat, + * eg. could retrieve the tags and write them without + * using yaffs_DeleteChunk + */ - if (!blockIndex) { - blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex)); - altBlockIndex = 1; + chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL); + if (chunkId > 0) { + if (chunkId < + (dev->internalStartBlock * dev->param.nChunksPerBlock) + || chunkId >= + ((dev->internalEndBlock + + 1) * dev->param.nChunksPerBlock)) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("Found daft chunkId %d for %d" TENDSTR), + chunkId, i)); + } else { + in->nDataChunks--; + yaffs_DeleteChunk(dev, chunkId, 1, __LINE__); + } + } } - if (!blockIndex) { - T(YAFFS_TRACE_SCAN, - (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR))); - return YAFFS_FAIL; - } +} - dev->blocksInCheckpoint = 0; - chunkData = yaffs_GetTempBuffer(dev, __LINE__); +void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize) +{ + int newFullChunks; + __u32 newSizeOfPartialChunk; + yaffs_Device *dev = obj->myDev; - /* Scan all the blocks to determine their state */ - bi = dev->blockInfo; - for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) { - yaffs_ClearChunkBits(dev, blk); - bi->pagesInUse = 0; - bi->softDeletions = 0; + yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk); + + yaffs_PruneResizedChunks(obj, newSize); - yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber); + if (newSizeOfPartialChunk != 0) { + int lastChunk = 1 + newFullChunks; + __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__); - bi->blockState = state; - bi->sequenceNumber = sequenceNumber; + /* Got to read and rewrite the last chunk with its new size and zero pad */ + yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer); + memset(localBuffer + newSizeOfPartialChunk, 0, + dev->nDataBytesPerChunk - newSizeOfPartialChunk); - if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA) - bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT; - if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK) - bi->blockState = state = YAFFS_BLOCK_STATE_DEAD; + yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer, + newSizeOfPartialChunk, 1); - T(YAFFS_TRACE_SCAN_DEBUG, - (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk, - state, sequenceNumber)); + yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__); + } + obj->variant.fileVariant.fileSize = newSize; - if (state == YAFFS_BLOCK_STATE_CHECKPOINT) { - dev->blocksInCheckpoint++; + yaffs_PruneFileStructure(dev, &obj->variant.fileVariant); +} - } else if (state == YAFFS_BLOCK_STATE_DEAD) { - T(YAFFS_TRACE_BAD_BLOCKS, - (TSTR("block %d is bad" TENDSTR), blk)); - } else if (state == YAFFS_BLOCK_STATE_EMPTY) { - T(YAFFS_TRACE_SCAN_DEBUG, - (TSTR("Block empty " TENDSTR))); - dev->nErasedBlocks++; - dev->nFreeChunks += dev->param.nChunksPerBlock; - } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) { - /* Determine the highest sequence number */ - if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER && - sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) { +int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize) +{ + yaffs_Device *dev = in->myDev; + int oldFileSize = in->variant.fileVariant.fileSize; - blockIndex[nBlocksToScan].seq = sequenceNumber; - blockIndex[nBlocksToScan].block = blk; + yaffs_FlushFilesChunkCache(in); + yaffs_InvalidateWholeChunkCache(in); - nBlocksToScan++; + yaffs_CheckGarbageCollection(dev,0); - if (sequenceNumber >= dev->sequenceNumber) - dev->sequenceNumber = sequenceNumber; - } else { - /* TODO: Nasty sequence number! */ - T(YAFFS_TRACE_SCAN, - (TSTR - ("Block scanning block %d has bad sequence number %d" - TENDSTR), blk, sequenceNumber)); + if (in->variantType != YAFFS_OBJECT_TYPE_FILE) + return YAFFS_FAIL; - } - } - bi++; - } + if (newSize == oldFileSize) + return YAFFS_OK; + + if(newSize > oldFileSize){ + yaffs2_HandleHole(in,newSize); + in->variant.fileVariant.fileSize = newSize; + } else { + /* newSize < oldFileSize */ + yaffs_ResizeDown(in, newSize); + } - T(YAFFS_TRACE_SCAN, - (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan)); + /* Write a new object header to reflect the resize. + * show we've shrunk the file, if need be + * Do this only if the file is not in the deleted directories + * and is not shadowed. + */ + if (in->parent && + !in->isShadowed && + in->parent->objectId != YAFFS_OBJECTID_UNLINKED && + in->parent->objectId != YAFFS_OBJECTID_DELETED) + yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL); + return YAFFS_OK; +} - YYIELD(); +loff_t yaffs_GetFileSize(yaffs_Object *obj) +{ + YCHAR *alias = NULL; + obj = yaffs_GetEquivalentObject(obj); - /* Sort the blocks */ -#ifndef CONFIG_YAFFS_USE_OWN_SORT - { - /* Use qsort now. */ - yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp); + switch (obj->variantType) { + case YAFFS_OBJECT_TYPE_FILE: + return obj->variant.fileVariant.fileSize; + case YAFFS_OBJECT_TYPE_SYMLINK: + alias = obj->variant.symLinkVariant.alias; + if(!alias) + return 0; + return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH); + default: + return 0; } +} + + + +int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync) +{ + int retVal; + if (in->dirty) { + yaffs_FlushFilesChunkCache(in); + if(dataSync) /* Only sync data */ + retVal=YAFFS_OK; + else { + if (updateTime) { +#ifdef CONFIG_YAFFS_WINCE + yfsd_WinFileTimeNow(in->win_mtime); #else - { - /* Dungy old bubble sort... */ - yaffs_BlockIndex temp; - int i; - int j; - - for (i = 0; i < nBlocksToScan; i++) - for (j = i + 1; j < nBlocksToScan; j++) - if (blockIndex[i].seq > blockIndex[j].seq) { - temp = blockIndex[j]; - blockIndex[j] = blockIndex[i]; - blockIndex[i] = temp; - } - } + in->yst_mtime = Y_CURRENT_TIME; + #endif + } - YYIELD(); + retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL) >= + 0) ? YAFFS_OK : YAFFS_FAIL; + } + } else { + retVal = YAFFS_OK; + } + + return retVal; - T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR))); +} - /* Now scan the blocks looking at the data. */ - startIterator = 0; - endIterator = nBlocksToScan - 1; - T(YAFFS_TRACE_SCAN_DEBUG, - (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan)); +static int yaffs_DoGenericObjectDeletion(yaffs_Object *in) +{ - /* For each block.... backwards */ - for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator; - blockIterator--) { - /* Cooperative multitasking! This loop can run for so - long that watchdog timers expire. */ - YYIELD(); + /* First off, invalidate the file's data in the cache, without flushing. */ + yaffs_InvalidateWholeChunkCache(in); - /* get the block to scan in the correct order */ - blk = blockIndex[blockIterator].block; + if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) { + /* Move to the unlinked directory so we have a record that it was deleted. */ + yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0); - bi = yaffs_GetBlockInfo(dev, blk); + } + yaffs_RemoveObjectFromDirectory(in); + yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__); + in->hdrChunk = 0; - state = bi->blockState; + yaffs_FreeObject(in); + return YAFFS_OK; - deleted = 0; +} - /* For each chunk in each block that needs scanning.... */ - foundChunksInBlock = 0; - for (c = dev->param.nChunksPerBlock - 1; - !alloc_failed && c >= 0 && - (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING || - state == YAFFS_BLOCK_STATE_ALLOCATING); c--) { - /* Scan backwards... - * Read the tags and decide what to do - */ +/* yaffs_DeleteFile deletes the whole file data + * and the inode associated with the file. + * It does not delete the links associated with the file. + */ +static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in) +{ - chunk = blk * dev->param.nChunksPerBlock + c; + int retVal; + int immediateDeletion = 0; + yaffs_Device *dev = in->myDev; - result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL, - &tags); + if (!in->myInode) + immediateDeletion = 1; - /* Let's have a good look at this chunk... */ + if (immediateDeletion) { + retVal = + yaffs_ChangeObjectName(in, in->myDev->deletedDir, + _Y("deleted"), 0, 0); + T(YAFFS_TRACE_TRACING, + (TSTR("yaffs: immediate deletion of file %d" TENDSTR), + in->objectId)); + in->deleted = 1; + in->myDev->nDeletedFiles++; + if (dev->param.disableSoftDelete || dev->param.isYaffs2) + yaffs_ResizeFile(in, 0); + yaffs_SoftDeleteFile(in); + } else { + retVal = + yaffs_ChangeObjectName(in, in->myDev->unlinkedDir, + _Y("unlinked"), 0, 0); + } - if (!tags.chunkUsed) { - /* An unassigned chunk in the block. - * If there are used chunks after this one, then - * it is a chunk that was skipped due to failing the erased - * check. Just skip it so that it can be deleted. - * But, more typically, We get here when this is an unallocated - * chunk and his means that either the block is empty or - * this is the one being allocated from - */ - if (foundChunksInBlock) { - /* This is a chunk that was skipped due to failing the erased check */ - } else if (c == 0) { - /* We're looking at the first chunk in the block so the block is unused */ - state = YAFFS_BLOCK_STATE_EMPTY; - dev->nErasedBlocks++; - } else { - if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING || - state == YAFFS_BLOCK_STATE_ALLOCATING) { - if (dev->sequenceNumber == bi->sequenceNumber) { - /* this is the block being allocated from */ - - T(YAFFS_TRACE_SCAN, - (TSTR - (" Allocating from %d %d" - TENDSTR), blk, c)); - - state = YAFFS_BLOCK_STATE_ALLOCATING; - dev->allocationBlock = blk; - dev->allocationPage = c; - dev->allocationBlockFinder = blk; - } else { - /* This is a partially written block that is not - * the current allocation block. - */ + return retVal; +} - T(YAFFS_TRACE_SCAN, - (TSTR("Partially written block %d detected" TENDSTR), - blk)); - } - } - } +int yaffs_DeleteFile(yaffs_Object *in) +{ + int retVal = YAFFS_OK; + int deleted; /* Need to cache value on stack if in is freed */ + yaffs_Device *dev = in->myDev; + + if (dev->param.disableSoftDelete || dev->param.isYaffs2) + yaffs_ResizeFile(in, 0); + + if (in->nDataChunks > 0) { + /* Use soft deletion if there is data in the file. + * That won't be the case if it has been resized to zero. + */ + if (!in->unlinked) + retVal = yaffs_UnlinkFileIfNeeded(in); + + deleted = in->deleted; - dev->nFreeChunks++; + if (retVal == YAFFS_OK && in->unlinked && !in->deleted) { + in->deleted = 1; + deleted = 1; + in->myDev->nDeletedFiles++; + yaffs_SoftDeleteFile(in); + } + return deleted ? YAFFS_OK : YAFFS_FAIL; + } else { + /* The file has no data chunks so we toss it immediately */ + yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top); + in->variant.fileVariant.top = NULL; + yaffs_DoGenericObjectDeletion(in); - } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) { - T(YAFFS_TRACE_SCAN, - (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR), - blk, c)); + return YAFFS_OK; + } +} - dev->nFreeChunks++; +static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj) +{ + return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) && + !(ylist_empty(&obj->variant.directoryVariant.children)); +} - } else if (tags.chunkId > 0) { - /* chunkId > 0 so it is a data chunk... */ - unsigned int endpos; - __u32 chunkBase = - (tags.chunkId - 1) * dev->nDataBytesPerChunk; +static int yaffs_DeleteDirectory(yaffs_Object *obj) +{ + /* First check that the directory is empty. */ + if (yaffs_IsNonEmptyDirectory(obj)) + return YAFFS_FAIL; - foundChunksInBlock = 1; + return yaffs_DoGenericObjectDeletion(obj); +} +static int yaffs_DeleteSymLink(yaffs_Object *in) +{ + if(in->variant.symLinkVariant.alias) + YFREE(in->variant.symLinkVariant.alias); + in->variant.symLinkVariant.alias=NULL; - yaffs_SetChunkBit(dev, blk, c); - bi->pagesInUse++; + return yaffs_DoGenericObjectDeletion(in); +} - in = yaffs_FindOrCreateObjectByNumber(dev, - tags. - objectId, - YAFFS_OBJECT_TYPE_FILE); - if (!in) { - /* Out of memory */ - alloc_failed = 1; - } +static int yaffs_DeleteHardLink(yaffs_Object *in) +{ + /* remove this hardlink from the list assocaited with the equivalent + * object + */ + ylist_del_init(&in->hardLinks); + return yaffs_DoGenericObjectDeletion(in); +} - if (in && - in->variantType == YAFFS_OBJECT_TYPE_FILE - && chunkBase < in->variant.fileVariant.shrinkSize) { - /* This has not been invalidated by a resize */ - if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) { - alloc_failed = 1; - } +int yaffs_DeleteObject(yaffs_Object *obj) +{ +int retVal = -1; + switch (obj->variantType) { + case YAFFS_OBJECT_TYPE_FILE: + retVal = yaffs_DeleteFile(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + if(!ylist_empty(&obj->variant.directoryVariant.dirty)){ + T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId)); + ylist_del_init(&obj->variant.directoryVariant.dirty); + } + return yaffs_DeleteDirectory(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + retVal = yaffs_DeleteSymLink(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + retVal = yaffs_DeleteHardLink(obj); + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + retVal = yaffs_DoGenericObjectDeletion(obj); + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + retVal = 0; + break; /* should not happen. */ + } - /* File size is calculated by looking at the data chunks if we have not - * seen an object header yet. Stop this practice once we find an object header. - */ - endpos = chunkBase + tags.byteCount; + return retVal; +} - if (!in->valid && /* have not got an object header yet */ - in->variant.fileVariant.scannedFileSize < endpos) { - in->variant.fileVariant.scannedFileSize = endpos; - in->variant.fileVariant.fileSize = endpos; - } +static int yaffs_UnlinkWorker(yaffs_Object *obj) +{ - } else if (in) { - /* This chunk has been invalidated by a resize, or a past file deletion - * so delete the chunk*/ - yaffs_DeleteChunk(dev, chunk, 1, __LINE__); + int immediateDeletion = 0; - } - } else { - /* chunkId == 0, so it is an ObjectHeader. - * Thus, we read in the object header and make the object - */ - foundChunksInBlock = 1; + if (!obj->myInode) + immediateDeletion = 1; - yaffs_SetChunkBit(dev, blk, c); - bi->pagesInUse++; + if(obj) + yaffs_UpdateParent(obj->parent); - oh = NULL; - in = NULL; + if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) { + return yaffs_DeleteHardLink(obj); + } else if (!ylist_empty(&obj->hardLinks)) { + /* Curve ball: We're unlinking an object that has a hardlink. + * + * This problem arises because we are not strictly following + * The Linux link/inode model. + * + * We can't really delete the object. + * Instead, we do the following: + * - Select a hardlink. + * - Unhook it from the hard links + * - Move it from its parent directory (so that the rename can work) + * - Rename the object to the hardlink's name. + * - Delete the hardlink + */ - if (tags.extraHeaderInfoAvailable) { - in = yaffs_FindOrCreateObjectByNumber(dev, - tags.objectId, - tags.extraObjectType); - if (!in) - alloc_failed = 1; - } + yaffs_Object *hl; + yaffs_Object *parent; + int retVal; + YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; - if (!in || - (!in->valid && dev->param.disableLazyLoad) || - tags.extraShadows || - (!in->valid && - (tags.objectId == YAFFS_OBJECTID_ROOT || - tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) { + hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks); - /* If we don't have valid info then we need to read the chunk - * TODO In future we can probably defer reading the chunk and - * living with invalid data until needed. - */ + yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1); + parent = hl->parent; - result = yaffs_ReadChunkWithTagsFromNAND(dev, - chunk, - chunkData, - NULL); + ylist_del_init(&hl->hardLinks); - oh = (yaffs_ObjectHeader *) chunkData; + yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl); - if (dev->param.inbandTags) { - /* Fix up the header if they got corrupted by inband tags */ - oh->shadowsObject = oh->inbandShadowsObject; - oh->isShrink = oh->inbandIsShrink; - } + retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0); - if (!in) { - in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type); - if (!in) - alloc_failed = 1; - } + if (retVal == YAFFS_OK) + retVal = yaffs_DoGenericObjectDeletion(hl); - } + return retVal; - if (!in) { - /* TODO Hoosterman we have a problem! */ - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs tragedy: Could not make object for object %d at chunk %d during scan" - TENDSTR), tags.objectId, chunk)); - continue; - } + } else if (immediateDeletion) { + switch (obj->variantType) { + case YAFFS_OBJECT_TYPE_FILE: + return yaffs_DeleteFile(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + ylist_del_init(&obj->variant.directoryVariant.dirty); + return yaffs_DeleteDirectory(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + return yaffs_DeleteSymLink(obj); + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + return yaffs_DoGenericObjectDeletion(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_UNKNOWN: + default: + return YAFFS_FAIL; + } + } else if(yaffs_IsNonEmptyDirectory(obj)) + return YAFFS_FAIL; + else + return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir, + _Y("unlinked"), 0, 0); +} - if (in->valid) { - /* We have already filled this one. - * We have a duplicate that will be discarded, but - * we first have to suck out resize info if it is a file. - */ - if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) && - ((oh && - oh->type == YAFFS_OBJECT_TYPE_FILE) || - (tags.extraHeaderInfoAvailable && - tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) { - __u32 thisSize = - (oh) ? oh->fileSize : tags. - extraFileLength; - __u32 parentObjectId = - (oh) ? oh-> - parentObjectId : tags. - extraParentObjectId; - - - isShrink = - (oh) ? oh->isShrink : tags. - extraIsShrinkHeader; - - /* If it is deleted (unlinked at start also means deleted) - * we treat the file size as being zeroed at this point. - */ - if (parentObjectId == - YAFFS_OBJECTID_DELETED - || parentObjectId == - YAFFS_OBJECTID_UNLINKED) { - thisSize = 0; - isShrink = 1; - } +static int yaffs_UnlinkObject(yaffs_Object *obj) +{ - if (isShrink && in->variant.fileVariant.shrinkSize > thisSize) - in->variant.fileVariant.shrinkSize = thisSize; + if (obj && obj->unlinkAllowed) + return yaffs_UnlinkWorker(obj); - if (isShrink) - bi->hasShrinkHeader = 1; + return YAFFS_FAIL; - } - /* Use existing - destroy this one. */ - yaffs_DeleteChunk(dev, chunk, 1, __LINE__); +} +int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name) +{ + yaffs_Object *obj; - } + obj = yaffs_FindObjectByName(dir, name); + return yaffs_UnlinkObject(obj); +} - if (!in->valid && in->variantType != - (oh ? oh->type : tags.extraObjectType)) - T(YAFFS_TRACE_ERROR, ( - TSTR("yaffs tragedy: Bad object type, " - TCONT("%d != %d, for object %d at chunk ") - TCONT("%d during scan") - TENDSTR), oh ? - oh->type : tags.extraObjectType, - in->variantType, tags.objectId, - chunk)); - - if (!in->valid && - (tags.objectId == YAFFS_OBJECTID_ROOT || - tags.objectId == - YAFFS_OBJECTID_LOSTNFOUND)) { - /* We only load some info, don't fiddle with directory structure */ - in->valid = 1; - - if (oh) { - in->variantType = oh->type; - - in->yst_mode = oh->yst_mode; -#ifdef CONFIG_YAFFS_WINCE - in->win_atime[0] = oh->win_atime[0]; - in->win_ctime[0] = oh->win_ctime[0]; - in->win_mtime[0] = oh->win_mtime[0]; - in->win_atime[1] = oh->win_atime[1]; - in->win_ctime[1] = oh->win_ctime[1]; - in->win_mtime[1] = oh->win_mtime[1]; -#else - in->yst_uid = oh->yst_uid; - in->yst_gid = oh->yst_gid; - in->yst_atime = oh->yst_atime; - in->yst_mtime = oh->yst_mtime; - in->yst_ctime = oh->yst_ctime; - in->yst_rdev = oh->yst_rdev; +/*----------------------- Initialisation Scanning ---------------------- */ -#endif - } else { - in->variantType = tags.extraObjectType; - in->lazyLoaded = 1; - } +void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId, + int backwardScanning) +{ + yaffs_Object *obj; - in->hdrChunk = chunk; + if (!backwardScanning) { + /* Handle YAFFS1 forward scanning case + * For YAFFS1 we always do the deletion + */ - } else if (!in->valid) { - /* we need to load this info */ + } else { + /* Handle YAFFS2 case (backward scanning) + * If the shadowed object exists then ignore. + */ + obj = yaffs_FindObjectByNumber(dev, objId); + if(obj) + return; + } - in->valid = 1; - in->hdrChunk = chunk; + /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc. + * We put it in unlinked dir to be cleaned up after the scanning + */ + obj = + yaffs_FindOrCreateObjectByNumber(dev, objId, + YAFFS_OBJECT_TYPE_FILE); + if (!obj) + return; + obj->isShadowed = 1; + yaffs_AddObjectToDirectory(dev->unlinkedDir, obj); + obj->variant.fileVariant.shrinkSize = 0; + obj->valid = 1; /* So that we don't read any other info for this file */ - if (oh) { - in->variantType = oh->type; +} - in->yst_mode = oh->yst_mode; -#ifdef CONFIG_YAFFS_WINCE - in->win_atime[0] = oh->win_atime[0]; - in->win_ctime[0] = oh->win_ctime[0]; - in->win_mtime[0] = oh->win_mtime[0]; - in->win_atime[1] = oh->win_atime[1]; - in->win_ctime[1] = oh->win_ctime[1]; - in->win_mtime[1] = oh->win_mtime[1]; -#else - in->yst_uid = oh->yst_uid; - in->yst_gid = oh->yst_gid; - in->yst_atime = oh->yst_atime; - in->yst_mtime = oh->yst_mtime; - in->yst_ctime = oh->yst_ctime; - in->yst_rdev = oh->yst_rdev; -#endif - if (oh->shadowsObject > 0) - yaffs_HandleShadowedObject(dev, - oh-> - shadowsObject, - 1); - +void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList) +{ + yaffs_Object *hl; + yaffs_Object *in; + while (hardList) { + hl = hardList; + hardList = (yaffs_Object *) (hardList->hardLinks.next); - yaffs_SetObjectName(in, oh->name); - parent = - yaffs_FindOrCreateObjectByNumber - (dev, oh->parentObjectId, - YAFFS_OBJECT_TYPE_DIRECTORY); + in = yaffs_FindObjectByNumber(dev, + hl->variant.hardLinkVariant. + equivalentObjectId); - fileSize = oh->fileSize; - isShrink = oh->isShrink; - equivalentObjectId = oh->equivalentObjectId; + if (in) { + /* Add the hardlink pointers */ + hl->variant.hardLinkVariant.equivalentObject = in; + ylist_add(&hl->hardLinks, &in->hardLinks); + } else { + /* Todo Need to report/handle this better. + * Got a problem... hardlink to a non-existant object + */ + hl->variant.hardLinkVariant.equivalentObject = NULL; + YINIT_LIST_HEAD(&hl->hardLinks); - } else { - in->variantType = tags.extraObjectType; - parent = - yaffs_FindOrCreateObjectByNumber - (dev, tags.extraParentObjectId, - YAFFS_OBJECT_TYPE_DIRECTORY); - fileSize = tags.extraFileLength; - isShrink = tags.extraIsShrinkHeader; - equivalentObjectId = tags.extraEquivalentObjectId; - in->lazyLoaded = 1; + } + } +} - } - in->dirty = 0; - if (!parent) - alloc_failed = 1; +static void yaffs_StripDeletedObjects(yaffs_Device *dev) +{ + /* + * Sort out state of unlinked and deleted objects after scanning. + */ + struct ylist_head *i; + struct ylist_head *n; + yaffs_Object *l; - /* directory stuff... - * hook up to parent - */ + if (dev->readOnly) + return; - if (parent && parent->variantType == - YAFFS_OBJECT_TYPE_UNKNOWN) { - /* Set up as a directory */ - parent->variantType = - YAFFS_OBJECT_TYPE_DIRECTORY; - YINIT_LIST_HEAD(&parent->variant. - directoryVariant. - children); - } else if (!parent || parent->variantType != - YAFFS_OBJECT_TYPE_DIRECTORY) { - /* Hoosterman, another problem.... - * We're trying to use a non-directory as a directory - */ + /* Soft delete all the unlinked files */ + ylist_for_each_safe(i, n, + &dev->unlinkedDir->variant.directoryVariant.children) { + if (i) { + l = ylist_entry(i, yaffs_Object, siblings); + yaffs_DeleteObject(l); + } + } - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." - TENDSTR))); - parent = dev->lostNFoundDir; - } + ylist_for_each_safe(i, n, + &dev->deletedDir->variant.directoryVariant.children) { + if (i) { + l = ylist_entry(i, yaffs_Object, siblings); + yaffs_DeleteObject(l); + } + } - yaffs_AddObjectToDirectory(parent, in); +} - itsUnlinked = (parent == dev->deletedDir) || - (parent == dev->unlinkedDir); +/* + * This code iterates through all the objects making sure that they are rooted. + * Any unrooted objects are re-rooted in lost+found. + * An object needs to be in one of: + * - Directly under deleted, unlinked + * - Directly or indirectly under root. + * + * Note: + * This code assumes that we don't ever change the current relationships between + * directories: + * rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL + * lostNfound->parent == rootDir + * + * This fixes the problem where directories might have inadvertently been deleted + * leaving the object "hanging" without being rooted in the directory tree. + */ + +static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj) +{ + return (obj == dev->deletedDir || + obj == dev->unlinkedDir|| + obj == dev->rootDir); +} - if (isShrink) { - /* Mark the block as having a shrinkHeader */ - bi->hasShrinkHeader = 1; - } +static void yaffs_FixHangingObjects(yaffs_Device *dev) +{ + yaffs_Object *obj; + yaffs_Object *parent; + int i; + struct ylist_head *lh; + struct ylist_head *n; + int depthLimit; + int hanging; - /* Note re hardlinks. - * Since we might scan a hardlink before its equivalent object is scanned - * we put them all in a list. - * After scanning is complete, we should have all the objects, so we run - * through this list and fix up all the chains. - */ + if (dev->readOnly) + return; - switch (in->variantType) { - case YAFFS_OBJECT_TYPE_UNKNOWN: - /* Todo got a problem */ - break; - case YAFFS_OBJECT_TYPE_FILE: - - if (in->variant.fileVariant. - scannedFileSize < fileSize) { - /* This covers the case where the file size is greater - * than where the data is - * This will happen if the file is resized to be larger - * than its current data extents. - */ - in->variant.fileVariant.fileSize = fileSize; - in->variant.fileVariant.scannedFileSize = fileSize; - } + /* Iterate through the objects in each hash entry, + * looking at each object. + * Make sure it is rooted. + */ - if (in->variant.fileVariant.shrinkSize > fileSize) - in->variant.fileVariant.shrinkSize = fileSize; + for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { + ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) { + if (lh) { + obj = ylist_entry(lh, yaffs_Object, hashLink); + parent= obj->parent; + if(yaffs_HasNULLParent(dev,obj)){ + /* These directories are not hanging */ + hanging = 0; + } + else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) + hanging = 1; + else if(yaffs_HasNULLParent(dev,parent)) + hanging = 0; + else { + /* + * Need to follow the parent chain to see if it is hanging. + */ + hanging = 0; + depthLimit=100; - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - if (!itsUnlinked) { - in->variant.hardLinkVariant.equivalentObjectId = - equivalentObjectId; - in->hardLinks.next = - (struct ylist_head *) hardList; - hardList = in; - } - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - /* Do nothing */ - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - /* Do nothing */ - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - if (oh) { - in->variant.symLinkVariant.alias = - yaffs_CloneString(oh->alias); - if (!in->variant.symLinkVariant.alias) - alloc_failed = 1; - } - break; + while(parent != dev->rootDir && + parent->parent && + parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY && + depthLimit > 0){ + parent = parent->parent; + depthLimit--; } - + if(parent != dev->rootDir) + hanging = 1; + } + if(hanging){ + T(YAFFS_TRACE_SCAN, + (TSTR("Hanging object %d moved to lost and found" TENDSTR), + obj->objectId)); + yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj); } - } - - } /* End of scanning for each chunk */ - - if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) { - /* If we got this far while scanning, then the block is fully allocated. */ - state = YAFFS_BLOCK_STATE_FULL; - } - - - bi->blockState = state; - - /* Now let's see if it was dirty */ - if (bi->pagesInUse == 0 && - !bi->hasShrinkHeader && - bi->blockState == YAFFS_BLOCK_STATE_FULL) { - yaffs_BlockBecameDirty(dev, blk); } - } - - yaffs_SkipRestOfBlock(dev); - - if (altBlockIndex) - YFREE_ALT(blockIndex); - else - YFREE(blockIndex); - - /* Ok, we've done all the scanning. - * Fix up the hard link chains. - * We should now have scanned all the objects, now it's time to add these - * hardlinks. - */ - yaffs_HardlinkFixup(dev, hardList); - - - yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__); - - if (alloc_failed) - return YAFFS_FAIL; - - T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR))); - - return YAFFS_OK; } -/*------------------------------ Directory Functions ----------------------------- */ -static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj) +/* + * Delete directory contents for cleaning up lost and found. + */ +static void yaffs_DeleteDirectoryContents(yaffs_Object *dir) { + yaffs_Object *obj; struct ylist_head *lh; - yaffs_Object *listObj; - - int count = 0; - - if (!obj) { - T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR))); - YBUG(); - return; - } - - if (yaffs_SkipVerification(obj->myDev)) - return; - - if (!obj->parent) { - T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR))); - YBUG(); - return; - } + struct ylist_head *n; - if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { - T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR))); + if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) YBUG(); - } + + ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) { + if (lh) { + obj = ylist_entry(lh, yaffs_Object, siblings); + if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) + yaffs_DeleteDirectoryContents(obj); - /* Iterate through the objects in each hash entry */ + T(YAFFS_TRACE_SCAN, + (TSTR("Deleting lost_found object %d" TENDSTR), + obj->objectId)); - ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) { - if (lh) { - listObj = ylist_entry(lh, yaffs_Object, siblings); - yaffs_VerifyObject(listObj); - if (obj == listObj) - count++; + /* Need to use UnlinkObject since Delete would not handle + * hardlinked objects correctly. + */ + yaffs_UnlinkObject(obj); } - } - - if (count != 1) { - T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count)); - YBUG(); } + } -static void yaffs_VerifyDirectory(yaffs_Object *directory) +static void yaffs_EmptyLostAndFound(yaffs_Device *dev) { - struct ylist_head *lh; - yaffs_Object *listObj; + yaffs_DeleteDirectoryContents(dev->lostNFoundDir); +} - if (!directory) { - YBUG(); - return; - } +static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in) +{ + __u8 *chunkData; + yaffs_ObjectHeader *oh; + yaffs_Device *dev; + yaffs_ExtendedTags tags; + int result; + int alloc_failed = 0; - if (yaffs_SkipFullVerification(directory->myDev)) + if (!in) return; - if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { - T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType)); - YBUG(); - } + dev = in->myDev; - /* Iterate through the objects in each hash entry */ +#if 0 + T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR), + in->objectId, + in->lazyLoaded ? "not yet" : "already")); +#endif - ylist_for_each(lh, &directory->variant.directoryVariant.children) { - if (lh) { - listObj = ylist_entry(lh, yaffs_Object, siblings); - if (listObj->parent != directory) { - T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent)); - YBUG(); - } - yaffs_VerifyObjectInDirectory(listObj); + if (in->lazyLoaded && in->hdrChunk > 0) { + in->lazyLoaded = 0; + chunkData = yaffs_GetTempBuffer(dev, __LINE__); + + result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags); + oh = (yaffs_ObjectHeader *) chunkData; + + in->yst_mode = oh->yst_mode; +#ifdef CONFIG_YAFFS_WINCE + in->win_atime[0] = oh->win_atime[0]; + in->win_ctime[0] = oh->win_ctime[0]; + in->win_mtime[0] = oh->win_mtime[0]; + in->win_atime[1] = oh->win_atime[1]; + in->win_ctime[1] = oh->win_ctime[1]; + in->win_mtime[1] = oh->win_mtime[1]; +#else + in->yst_uid = oh->yst_uid; + in->yst_gid = oh->yst_gid; + in->yst_atime = oh->yst_atime; + in->yst_mtime = oh->yst_mtime; + in->yst_ctime = oh->yst_ctime; + in->yst_rdev = oh->yst_rdev; + +#endif + yaffs_SetObjectNameFromOH(in, oh); + + if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) { + in->variant.symLinkVariant.alias = + yaffs_CloneString(oh->alias); + if (!in->variant.symLinkVariant.alias) + alloc_failed = 1; /* Not returned to caller */ } + + yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__); } } +/*------------------------------ Directory Functions ----------------------------- */ + /* *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new * link (ie. name) is created or deleted in the directory. @@ -7062,6 +4425,7 @@ static void yaffs_UpdateParent(yaffs_Object *obj) yaffs_Device *dev; if(!obj) return; +#ifndef CONFIG_YAFFS_WINCE dev = obj->myDev; obj->dirty = 1; @@ -7076,6 +4440,7 @@ static void yaffs_UpdateParent(yaffs_Object *obj) } else yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL); +#endif } void yaffs_UpdateDirtyDirectories(yaffs_Device *dev) @@ -7122,7 +4487,7 @@ static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj) yaffs_VerifyDirectory(parent); } -static void yaffs_AddObjectToDirectory(yaffs_Object *directory, +void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj) { if (!directory) { @@ -7276,36 +4641,124 @@ yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj) return obj; } -int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize) -{ - memset(name, 0, buffSize * sizeof(YCHAR)); - - yaffs_CheckObjectDetailsLoaded(obj); +/* + * A note or two on object names. + * * If the object name is missing, we then make one up in the form objnnn + * + * * ASCII names are stored in the object header's name field from byte zero + * * Unicode names are historically stored starting from byte zero. + * + * Then there are automatic Unicode names... + * The purpose of these is to save names in a way that can be read as + * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII + * system to share files. + * + * These automatic unicode are stored slightly differently... + * - If the name can fit in the ASCII character space then they are saved as + * ascii names as per above. + * - If the name needs Unicode then the name is saved in Unicode + * starting at oh->name[1]. - if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) { - yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1); - } else if (obj->hdrChunk <= 0) { + */ +static void yaffs_FixNullName(yaffs_Object * obj,YCHAR * name, int buffSize) +{ + /* Create an object name if we could not find one. */ + if(yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH) == 0){ YCHAR locName[20]; YCHAR numString[20]; YCHAR *x = &numString[19]; unsigned v = obj->objectId; numString[19] = 0; - while (v > 0) { + while(v>0){ x--; *x = '0' + (v % 10); v /= 10; } /* make up a name */ yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX); - yaffs_strcat(locName, x); + yaffs_strcat(locName,x); yaffs_strncpy(name, locName, buffSize - 1); + } +} + +static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize) +{ +#ifdef CONFIG_YAFFS_AUTO_UNICODE + if(dev->param.autoUnicode){ + if(*ohName){ + /* It is an ASCII name, so do an ASCII to unicode conversion */ + const char *asciiOhName = (const char *)ohName; + int n = bufferSize - 1; + while(n > 0 && *asciiOhName){ + *name = *asciiOhName; + name++; + asciiOhName++; + n--; + } + } else + yaffs_strncpy(name,ohName+1, bufferSize -1); + } else +#endif + yaffs_strncpy(name, ohName, bufferSize - 1); +} + + +static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev, YCHAR *ohName, const YCHAR *name) +{ +#ifdef CONFIG_YAFFS_AUTO_UNICODE + + int isAscii; + YCHAR *w; + + if(dev->param.autoUnicode){ + + isAscii = 1; + w = name; + + /* Figure out if the name will fit in ascii character set */ + while(isAscii && *w){ + if((*w) & 0xff00) + isAscii = 0; + w++; + } + if(isAscii){ + /* It is an ASCII name, so do a unicode to ascii conversion */ + char *asciiOhName = (char *)ohName; + int n = YAFFS_MAX_NAME_LENGTH - 1; + while(n > 0 && *name){ + *asciiOhName= *name; + name++; + asciiOhName++; + n--; + } + } else{ + /* It is a unicode name, so save starting at the second YCHAR */ + *ohName = 0; + yaffs_strncpy(ohName+1,name, YAFFS_MAX_NAME_LENGTH -2); + } } + else +#endif + yaffs_strncpy(ohName,name, YAFFS_MAX_NAME_LENGTH - 1); + +} + +int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize) +{ + memset(name, 0, buffSize * sizeof(YCHAR)); + + yaffs_CheckObjectDetailsLoaded(obj); + + if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) { + yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1); + } #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM - else if (obj->shortName[0]) - yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1); + else if (obj->shortName[0]) { + yaffs_strcpy(name, obj->shortName); + } #endif - else { + else if(obj->hdrChunk > 0) { int result; __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__); @@ -7318,15 +4771,17 @@ int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize) obj->hdrChunk, buffer, NULL); } - yaffs_strncpy(name, oh->name, buffSize - 1); - name[buffSize-1]=0; + yaffs_LoadNameFromObjectHeader(obj->myDev,name,oh->name,buffSize); yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__); } - return yaffs_strnlen(name,buffSize-1); + yaffs_FixNullName(obj,name,buffSize); + + return yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH); } + int yaffs_GetObjectFileLength(yaffs_Object *obj) { /* Dereference any hard linking */ @@ -7463,7 +4918,7 @@ int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr) #endif -static int yaffs_DoXMod(yaffs_Object *obj, int set, const char *name, const void *value, int size, int flags) +static int yaffs_DoXMod(yaffs_Object *obj, int set, const YCHAR *name, const void *value, int size, int flags) { yaffs_XAttrMod xmod; @@ -7484,10 +4939,11 @@ static int yaffs_DoXMod(yaffs_Object *obj, int set, const char *name, const void return -ENOSPC; } -static int yaffs_ApplyXMod(yaffs_Device *dev, char *buffer, yaffs_XAttrMod *xmod) +static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod) { int retval = 0; int x_offs = sizeof(yaffs_ObjectHeader); + yaffs_Device *dev = obj->myDev; int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader); char * x_buffer = buffer + x_offs; @@ -7497,12 +4953,15 @@ static int yaffs_ApplyXMod(yaffs_Device *dev, char *buffer, yaffs_XAttrMod *xmod else retval = nval_del(x_buffer, x_size, xmod->name); + obj->hasXattr = nval_hasvalues(x_buffer, x_size); + obj->xattrKnown = 1; + xmod->result = retval; return retval; } -static int yaffs_DoXFetch(yaffs_Object *obj, const char *name, void *value, int size) +static int yaffs_DoXFetch(yaffs_Object *obj, const YCHAR *name, void *value, int size) { char *buffer = NULL; int result; @@ -7516,7 +4975,17 @@ static int yaffs_DoXFetch(yaffs_Object *obj, const char *name, void *value, int int retval = 0; if(obj->hdrChunk < 1) - return -ENOENT; + return -ENODATA; + + /* If we know that the object has no xattribs then don't do all the + * reading and parsing. + */ + if(obj->xattrKnown && !obj->hasXattr){ + if(name) + return -ENODATA; + else + return 0; + } buffer = yaffs_GetTempBuffer(dev, __LINE__); if(!buffer) @@ -7529,6 +4998,11 @@ static int yaffs_DoXFetch(yaffs_Object *obj, const char *name, void *value, int else{ x_buffer = buffer + x_offs; + if (!obj->xattrKnown){ + obj->hasXattr = nval_hasvalues(x_buffer, x_size); + obj->xattrKnown = 1; + } + if(name) retval = nval_get(x_buffer, x_size, name, value, size); else @@ -7538,17 +5012,17 @@ static int yaffs_DoXFetch(yaffs_Object *obj, const char *name, void *value, int return retval; } -int yaffs_SetXAttribute(yaffs_Object *obj, const char *name, const void * value, int size, int flags) +int yaffs_SetXAttribute(yaffs_Object *obj, const YCHAR *name, const void * value, int size, int flags) { return yaffs_DoXMod(obj, 1, name, value, size, flags); } -int yaffs_RemoveXAttribute(yaffs_Object *obj, const char *name) +int yaffs_RemoveXAttribute(yaffs_Object *obj, const YCHAR *name) { return yaffs_DoXMod(obj, 0, name, NULL, 0, 0); } -int yaffs_GetXAttribute(yaffs_Object *obj, const char *name, void *value, int size) +int yaffs_GetXAttribute(yaffs_Object *obj, const YCHAR *name, void *value, int size) { return yaffs_DoXFetch(obj, name, value, size); } @@ -7876,7 +5350,7 @@ int yaffs_GutsInitialise(yaffs_Device *dev) if (!init_failed) { /* Now scan the flash. */ if (dev->param.isYaffs2) { - if (yaffs_CheckpointRestore(dev)) { + if (yaffs2_CheckpointRestore(dev)) { yaffs_CheckObjectDetailsLoaded(dev->rootDir); T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: restored from checkpoint" TENDSTR))); @@ -7905,10 +5379,10 @@ int yaffs_GutsInitialise(yaffs_Device *dev) if (!init_failed && !yaffs_CreateInitialDirectories(dev)) init_failed = 1; - if (!init_failed && !yaffs_ScanBackwards(dev)) + if (!init_failed && !yaffs2_ScanBackwards(dev)) init_failed = 1; } - } else if (!yaffs_Scan(dev)) + } else if (!yaffs1_Scan(dev)) init_failed = 1; yaffs_StripDeletedObjects(dev); @@ -7940,7 +5414,7 @@ int yaffs_GutsInitialise(yaffs_Device *dev) /* Clean up any aborted checkpoint data */ if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0) - yaffs_InvalidateCheckpoint(dev); + yaffs2_InvalidateCheckpoint(dev); T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR))); @@ -7980,7 +5454,7 @@ void yaffs_Deinitialise(yaffs_Device *dev) } } -static int yaffs_CountFreeChunks(yaffs_Device *dev) +int yaffs_CountFreeChunks(yaffs_Device *dev) { int nFree=0; int b; @@ -8036,9 +5510,7 @@ int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev) nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock); /* Now we figure out how much to reserve for the checkpoint and report that... */ - blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint; - if (blocksForCheckpoint < 0) - blocksForCheckpoint = 0; + blocksForCheckpoint = yaffs2_CalcCheckpointBlocksRequired(dev); nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock); @@ -8049,27 +5521,6 @@ int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev) } -static int yaffs_freeVerificationFailures; - -static void yaffs_VerifyFreeChunks(yaffs_Device *dev) -{ - int counted; - int difference; - - if (yaffs_SkipVerification(dev)) - return; - - counted = yaffs_CountFreeChunks(dev); - - difference = dev->nFreeChunks - counted; - - if (difference) { - T(YAFFS_TRACE_ALWAYS, - (TSTR("Freechunks verification failure %d %d %d" TENDSTR), - dev->nFreeChunks, counted, difference)); - yaffs_freeVerificationFailures++; - } -} /*---------------------------------------- YAFFS test code ----------------------*/