/* * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. * * Copyright (C) 2002-2007 Aleph One Ltd. * for Toby Churchill Ltd and Brightstar Engineering * * Created by Charles Manning * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ /* XXX U-BOOT XXX */ #include const char *yaffs_guts_c_version = "$Id: yaffs_guts.c,v 1.52 2007/10/16 00:45:05 charles Exp $"; #include "yportenv.h" #include "linux/stat.h" #include "yaffsinterface.h" #include "yaffsfs.h" #include "yaffs_guts.h" #include "yaffs_tagsvalidity.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_nand.h" #include "yaffs_packedtags2.h" #include "malloc.h" #ifdef CONFIG_YAFFS_WINCE void yfsd_LockYAFFS(BOOL fsLockOnly); void yfsd_UnlockYAFFS(BOOL fsLockOnly); #endif #define YAFFS_PASSIVE_GC_CHUNKS 2 #include "yaffs_ecc.h" /* Robustification (if it ever comes about...) */ static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND); static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk); static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND, const __u8 * data, const yaffs_ExtendedTags * tags); static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND, const yaffs_ExtendedTags * tags); /* Other local prototypes */ 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); static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj); static int yaffs_CheckStructures(void); static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level, int chunkOffset, int *limit); static int yaffs_DoGenericObjectDeletion(yaffs_Object * in); static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo); static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo); static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer, int lineNo); static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev, int chunkInNAND); static int yaffs_UnlinkWorker(yaffs_Object * obj); static void yaffs_DestroyObject(yaffs_Object * obj); static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId, int chunkInObject); loff_t yaffs_GetFileSize(yaffs_Object * obj); 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); #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); /* Function to calculate chunk and offset */ static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset) { if(dev->chunkShift){ /* Easy-peasy power of 2 case */ *chunk = (__u32)(addr >> dev->chunkShift); *offset = (__u32)(addr & dev->chunkMask); } else if(dev->crumbsPerChunk) { /* Case where we're using "crumbs" */ *offset = (__u32)(addr & dev->crumbMask); addr >>= dev->crumbShift; *chunk = ((__u32)addr)/dev->crumbsPerChunk; *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift); } else YBUG(); } /* Function to return the number of shifts for a power of 2 greater than or equal * to the given number * Note we don't try to cater for all possible numbers and this does not have to * be hellishly efficient. */ static __u32 ShiftsGE(__u32 x) { int extraBits; int nShifts; nShifts = extraBits = 0; while(x>1){ if(x & 1) extraBits++; x>>=1; nShifts++; } if(extraBits) nShifts++; return nShifts; } /* Function to return the number of shifts to get a 1 in bit 0 */ static __u32 ShiftDiv(__u32 x) { int nShifts; nShifts = 0; if(!x) return 0; while( !(x&1)){ x>>=1; nShifts++; } return nShifts; } /* * Temporary buffer manipulations. */ static int yaffs_InitialiseTempBuffers(yaffs_Device *dev) { int i; __u8 *buf = (__u8 *)1; memset(dev->tempBuffer,0,sizeof(dev->tempBuffer)); for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) { dev->tempBuffer[i].line = 0; /* not in use */ dev->tempBuffer[i].buffer = buf = YMALLOC_DMA(dev->nDataBytesPerChunk); } return buf ? YAFFS_OK : YAFFS_FAIL; } static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo) { int i, j; for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { if (dev->tempBuffer[i].line == 0) { dev->tempBuffer[i].line = lineNo; if ((i + 1) > dev->maxTemp) { dev->maxTemp = i + 1; for (j = 0; j <= i; j++) dev->tempBuffer[j].maxLine = dev->tempBuffer[j].line; } return dev->tempBuffer[i].buffer; } } T(YAFFS_TRACE_BUFFERS, (TSTR("Out of temp buffers at line %d, other held by lines:"), lineNo)); for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line)); } T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR))); /* * If we got here then we have to allocate an unmanaged one * This is not good. */ dev->unmanagedTempAllocations++; return YMALLOC(dev->nDataBytesPerChunk); } static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer, int lineNo) { int i; for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { if (dev->tempBuffer[i].buffer == buffer) { dev->tempBuffer[i].line = 0; return; } } if (buffer) { /* assume it is an unmanaged one. */ T(YAFFS_TRACE_BUFFERS, (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR), lineNo)); YFREE(buffer); dev->unmanagedTempDeallocations++; } } /* * Determine if we have a managed buffer. */ int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer) { int i; for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { if (dev->tempBuffer[i].buffer == buffer) return 1; } for (i = 0; i < dev->nShortOpCaches; i++) { if( dev->srCache[i].data == buffer ) return 1; } if (buffer == dev->checkpointBuffer) return 1; T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR))); return 0; } /* * Chunk bitmap manipulations */ static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk) { 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)); } static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk) { if(blk < dev->internalStartBlock || blk > dev->internalEndBlock || chunk < 0 || chunk >= dev->nChunksPerBlock) { T(YAFFS_TRACE_ERROR, (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk)); YBUG(); } } static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk) { __u8 *blkBits = yaffs_BlockBits(dev, blk); memset(blkBits, 0, dev->chunkBitmapStride); } static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk) { __u8 *blkBits = yaffs_BlockBits(dev, blk); yaffs_VerifyChunkBitId(dev,blk,chunk); blkBits[chunk / 8] &= ~(1 << (chunk & 7)); } static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk) { __u8 *blkBits = yaffs_BlockBits(dev, blk); yaffs_VerifyChunkBitId(dev,blk,chunk); blkBits[chunk / 8] |= (1 << (chunk & 7)); } static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk) { __u8 *blkBits = yaffs_BlockBits(dev, blk); yaffs_VerifyChunkBitId(dev,blk,chunk); return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0; } 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++; } 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; } blkBits++; } return n; } /* * Verification code */ static Y_INLINE int yaffs_SkipVerification(yaffs_Device *dev) { return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL)); } static Y_INLINE int yaffs_SkipFullVerification(yaffs_Device *dev) { return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL)); } static Y_INLINE int yaffs_SkipNANDVerification(yaffs_Device *dev) { return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND)); } static const char * blockStateName[] = { "Unknown", "Needs scanning", "Scanning", "Empty", "Allocating", "Full", "Dirty", "Checkpoint", "Collecting", "Dead" }; static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n) { int actuallyUsed; int inUse; if(yaffs_SkipVerification(dev)) return; /* Report illegal runtime states */ if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES) T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState)); 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])); } /* Check pages in use and soft deletions are legal */ actuallyUsed = bi->pagesInUse - bi->softDeletions; if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock || bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock || actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock) T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR), n,bi->pagesInUse,bi->softDeletions)); /* 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)); /* Check that the sequence number is valid. * Ten million is legal, but is very unlikely */ if(dev->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)); } static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n) { yaffs_VerifyBlock(dev,bi,n); /* After collection the block should be in the erased state */ /* TODO: This will need to change if we do partial gc */ if(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)); } } static void yaffs_VerifyBlocks(yaffs_Device *dev) { int i; int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES]; int nIllegalBlockStates = 0; if(yaffs_SkipVerification(dev)) return; memset(nBlocksPerState,0,sizeof(nBlocksPerState)); for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i); yaffs_VerifyBlock(dev,bi,i); if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES) nBlocksPerState[bi->blockState]++; else nIllegalBlockStates++; } T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR))); T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR))); 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))); for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++) T(YAFFS_TRACE_VERIFY, (TSTR("%s %d blocks"TENDSTR), blockStateName[i],nBlocksPerState[i])); 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])); 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])); 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])); T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR))); } /* * Verify the object header. oh must be valid, but obj and tags may be NULL in which * case those tests will not be performed. */ static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck) { if(yaffs_SkipVerification(obj->myDev)) return; if(!(tags && obj && oh)){ T(YAFFS_TRACE_VERIFY, (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR), (__u32)tags,(__u32)obj,(__u32)oh)); return; } 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)); if(tags->objectId != obj->objectId) T(YAFFS_TRACE_VERIFY, (TSTR("Obj %d header mismatch objectId %d"TENDSTR), tags->objectId, obj->objectId)); /* * 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)); 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)); 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(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */ T(YAFFS_TRACE_VERIFY, (TSTR("Obj %d header name is 0xFF"TENDSTR), obj->objectId)); } 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; chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS; for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){ __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i); 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++; } } } return ok; } static void yaffs_VerifyFile(yaffs_Object *obj) { int requiredTallness; int actualTallness; __u32 lastChunk; __u32 x; __u32 i; yaffs_Device *dev; yaffs_ExtendedTags tags; yaffs_Tnode *tn; __u32 objectId; if(obj && yaffs_SkipVerification(obj->myDev)) return; 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++; } actualTallness = obj->variant.fileVariant.topLevel; if(requiredTallness > actualTallness ) T(YAFFS_TRACE_VERIFY, (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR), obj->objectId,actualTallness, requiredTallness)); /* 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; 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)); } } } } } static void yaffs_VerifyDirectory(yaffs_Object *obj) { if(obj && yaffs_SkipVerification(obj->myDev)) return; } static void yaffs_VerifyHardLink(yaffs_Object *obj) { if(obj && yaffs_SkipVerification(obj->myDev)) return; /* Verify sane equivalent object */ } static void yaffs_VerifySymlink(yaffs_Object *obj) { if(obj && yaffs_SkipVerification(obj->myDev)) return; /* Verify symlink string */ } static void yaffs_VerifySpecial(yaffs_Object *obj) { if(obj && yaffs_SkipVerification(obj->myDev)) return; } static void yaffs_VerifyObject(yaffs_Object *obj) { yaffs_Device *dev; __u32 chunkMin; __u32 chunkMax; __u32 chunkIdOk; __u32 chunkIsLive; if(!obj) return; dev = obj->myDev; if(yaffs_SkipVerification(dev)) return; /* Check sane object header chunk */ chunkMin = dev->internalStartBlock * dev->nChunksPerBlock; chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1; chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax); chunkIsLive = chunkIdOk && yaffs_CheckChunkBit(dev, obj->chunkId / dev->nChunksPerBlock, obj->chunkId % dev->nChunksPerBlock); if(!obj->fake && (!chunkIdOk || !chunkIsLive)) { T(YAFFS_TRACE_VERIFY, (TSTR("Obj %d has chunkId %d %s %s"TENDSTR), obj->objectId,obj->chunkId, chunkIdOk ? "" : ",out of range", chunkIsLive || !chunkIdOk ? "" : ",marked as deleted")); } if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) { yaffs_ExtendedTags tags; yaffs_ObjectHeader *oh; __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__); oh = (yaffs_ObjectHeader *)buffer; yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags); yaffs_VerifyObjectHeader(obj,oh,&tags,1); yaffs_ReleaseTempBuffer(dev,buffer,__LINE__); } /* 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)); } /* 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)); } 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; } } static void yaffs_VerifyObjects(yaffs_Device *dev) { yaffs_Object *obj; int i; struct list_head *lh; if(yaffs_SkipVerification(dev)) return; /* Iterate through the objects in each hash entry */ for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++){ list_for_each(lh, &dev->objectBucket[i].list) { if (lh) { obj = list_entry(lh, yaffs_Object, hashLink); yaffs_VerifyObject(obj); } } } } /* * Simple hash function. Needs to have a reasonable spread */ static Y_INLINE int yaffs_HashFunction(int n) { /* XXX U-BOOT XXX */ /*n = abs(n); */ if (n < 0) n = -n; return (n % YAFFS_NOBJECT_BUCKETS); } /* * Access functions to useful fake objects */ yaffs_Object *yaffs_Root(yaffs_Device * dev) { return dev->rootDir; } yaffs_Object *yaffs_LostNFound(yaffs_Device * dev) { return dev->lostNFoundDir; } /* * Erased NAND checking functions */ int yaffs_CheckFF(__u8 * buffer, int nBytes) { /* Horrible, slow implementation */ while (nBytes--) { if (*buffer != 0xFF) return 0; buffer++; } 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(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; } yaffs_ReleaseTempBuffer(dev, data, __LINE__); return retval; } static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev, const __u8 * data, yaffs_ExtendedTags * tags, int useReserve) { int attempts = 0; int writeOk = 0; int chunk; yaffs_InvalidateCheckpoint(dev); do { yaffs_BlockInfo *bi = 0; int erasedOk = 0; chunk = yaffs_AllocateChunk(dev, useReserve, &bi); if (chunk < 0) { /* no space */ break; } /* 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. */ if (bi->gcPrioritise) { yaffs_DeleteChunk(dev, chunk, 1, __LINE__); /* try another chunk */ continue; } /* let's give it a try */ attempts++; #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)); /* try another chunk */ continue; } bi->skipErasedCheck = 1; } writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk, data, tags); if (writeOk != YAFFS_OK) { yaffs_HandleWriteChunkError(dev, chunk, erasedOk); /* try another chunk */ continue; } /* 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; } /* * 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_MarkBlockBad(dev, blockInNAND); 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) { } static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND, const yaffs_ExtendedTags * 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->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__); } /*---------------- Name handling functions ------------*/ static __u16 yaffs_CalcNameSum(const YCHAR * name) { __u16 sum = 0; __u16 i = 1; YUCHAR *bname = (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 if (name && yaffs_strlen(name) <= 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. */ /* yaffs_CreateTnodes creates a bunch more tnodes and * adds them to the tnode free list. * Don't use this function directly */ static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes) { int i; int tnodeSize; yaffs_Tnode *newTnodes; __u8 *mem; yaffs_Tnode *curr; yaffs_Tnode *next; yaffs_TnodeList *tnl; if (nTnodes < 1) return YAFFS_OK; /* Calculate the tnode size in bytes for variable width tnode support. * Must be a multiple of 32-bits */ tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8; /* make these things */ newTnodes = YMALLOC(nTnodes * tnodeSize); mem = (__u8 *)newTnodes; if (!newTnodes) { T(YAFFS_TRACE_ERROR, (TSTR("yaffs: Could not allocate Tnodes" TENDSTR))); return YAFFS_FAIL; } /* Hook them into the free list */ #if 0 for (i = 0; i < nTnodes - 1; i++) { newTnodes[i].internal[0] = &newTnodes[i + 1]; #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1; #endif } newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes; #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1; #endif dev->freeTnodes = newTnodes; #else /* New hookup for wide tnodes */ for(i = 0; i < nTnodes -1; i++) { curr = (yaffs_Tnode *) &mem[i * tnodeSize]; next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize]; curr->internal[0] = next; } curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize]; curr->internal[0] = dev->freeTnodes; dev->freeTnodes = (yaffs_Tnode *)mem; #endif dev->nFreeTnodes += nTnodes; dev->nTnodesCreated += nTnodes; /* Now add this bunch of tnodes to a list for freeing up. * NB If we can't add this to the management list it isn't fatal * but it just means we can't free this bunch of tnodes later. */ tnl = YMALLOC(sizeof(yaffs_TnodeList)); if (!tnl) { T(YAFFS_TRACE_ERROR, (TSTR ("yaffs: Could not add tnodes to management list" TENDSTR))); return YAFFS_FAIL; } else { tnl->tnodes = newTnodes; tnl->next = dev->allocatedTnodeList; dev->allocatedTnodeList = tnl; } T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR))); return YAFFS_OK; } /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */ static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev) { yaffs_Tnode *tn = NULL; /* If there are none left make more */ if (!dev->freeTnodes) { yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES); } if (dev->freeTnodes) { tn = dev->freeTnodes; #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) { /* Hoosterman, this thing looks like it isn't in the list */ T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Tnode list bug 1" TENDSTR))); } #endif dev->freeTnodes = dev->freeTnodes->internal[0]; dev->nFreeTnodes--; } return tn; } static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev) { yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev); if(tn) memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8); 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) { if (tn) { #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) { /* Hoosterman, this thing looks like it is already in the list */ T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Tnode list bug 2" TENDSTR))); } tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1; #endif tn->internal[0] = dev->freeTnodes; dev->freeTnodes = tn; dev->nFreeTnodes++; } } static void yaffs_DeinitialiseTnodes(yaffs_Device * dev) { /* Free the list of allocated tnodes */ yaffs_TnodeList *tmp; while (dev->allocatedTnodeList) { tmp = dev->allocatedTnodeList->next; YFREE(dev->allocatedTnodeList->tnodes); YFREE(dev->allocatedTnodeList); dev->allocatedTnodeList = tmp; } dev->freeTnodes = NULL; dev->nFreeTnodes = 0; } static void yaffs_InitialiseTnodes(yaffs_Device * dev) { dev->allocatedTnodeList = NULL; dev->freeTnodes = NULL; dev->nFreeTnodes = 0; dev->nTnodesCreated = 0; } void yaffs_PutLevel0Tnode(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; /* 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) { /* Not tall enough, so we can't find it, return NULL. */ return NULL; } /* 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; } else { T(YAFFS_TRACE_ERROR, (TSTR("yaffs: no more tnodes" TENDSTR))); } } fStruct->topLevel = requiredTallness; } /* 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); } 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); } } 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->nChunksPerBlock, theChunk % dev->nChunksPerBlock)) { yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, tags); if (yaffs_TagsMatch(tags, objectId, chunkInInode)) { /* found it; */ return theChunk; } } theChunk++; } return -1; } /* 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_PutLevel0Tnode(dev,tn,i,0); } } return (i < 0) ? 1 : 0; } } return 1; } static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk) { yaffs_BlockInfo *theBlock; T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk)); theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock); if (theBlock) { theBlock->softDeletions++; dev->nFreeChunks++; } } /* 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_PutLevel0Tnode(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. */ static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn, __u32 level, int del0) { int i; int hasData; if (tn) { hasData = 0; for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { if (tn->internal[i] && level > 0) { tn->internal[i] = yaffs_PruneWorker(dev, tn->internal[i], level - 1, (i == 0) ? del0 : 1); } if (tn->internal[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.-------------------*/ /* yaffs_CreateFreeObjects creates a bunch more objects and * adds them to the object free list. */ static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects) { int i; yaffs_Object *newObjects; yaffs_ObjectList *list; if (nObjects < 1) return YAFFS_OK; /* make these things */ newObjects = YMALLOC(nObjects * sizeof(yaffs_Object)); list = YMALLOC(sizeof(yaffs_ObjectList)); if (!newObjects || !list) { if(newObjects) YFREE(newObjects); if(list) YFREE(list); T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Could not allocate more objects" TENDSTR))); return YAFFS_FAIL; } /* Hook them into the free list */ for (i = 0; i < nObjects - 1; i++) { newObjects[i].siblings.next = (struct list_head *)(&newObjects[i + 1]); } newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects; dev->freeObjects = newObjects; dev->nFreeObjects += nObjects; dev->nObjectsCreated += nObjects; /* Now add this bunch of Objects to a list for freeing up. */ list->objects = newObjects; list->next = dev->allocatedObjectList; dev->allocatedObjectList = list; 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 *tn = NULL; /* If there are none left make more */ if (!dev->freeObjects) { yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS); } if (dev->freeObjects) { tn = dev->freeObjects; dev->freeObjects = (yaffs_Object *) (dev->freeObjects->siblings.next); dev->nFreeObjects--; /* Now sweeten it up... */ memset(tn, 0, sizeof(yaffs_Object)); tn->myDev = dev; tn->chunkId = -1; tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN; INIT_LIST_HEAD(&(tn->hardLinks)); INIT_LIST_HEAD(&(tn->hashLink)); INIT_LIST_HEAD(&tn->siblings); /* 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, tn); } } return tn; } 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 has 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->chunkId = 0; /* Not a valid chunk. */ } return obj; } static void yaffs_UnhashObject(yaffs_Object * tn) { int bucket; yaffs_Device *dev = tn->myDev; /* If it is still linked into the bucket list, free from the list */ if (!list_empty(&tn->hashLink)) { list_del_init(&tn->hashLink); bucket = yaffs_HashFunction(tn->objectId); dev->objectBucket[bucket].count--; } } /* FreeObject frees up a Object and puts it back on the free list */ static void yaffs_FreeObject(yaffs_Object * tn) { yaffs_Device *dev = tn->myDev; /* XXX U-BOOT XXX */ #if 0 #ifdef __KERNEL__ if (tn->myInode) { /* We're still hooked up to a cached inode. * Don't delete now, but mark for later deletion */ tn->deferedFree = 1; return; } #endif #endif yaffs_UnhashObject(tn); /* Link into the free list. */ tn->siblings.next = (struct list_head *)(dev->freeObjects); dev->freeObjects = tn; dev->nFreeObjects++; } /* XXX U-BOOT XXX */ #if 0 #ifdef __KERNEL__ void yaffs_HandleDeferedFree(yaffs_Object * obj) { if (obj->deferedFree) { yaffs_FreeObject(obj); } } #endif #endif static void yaffs_DeinitialiseObjects(yaffs_Device * dev) { /* Free the list of allocated Objects */ yaffs_ObjectList *tmp; while (dev->allocatedObjectList) { tmp = dev->allocatedObjectList->next; YFREE(dev->allocatedObjectList->objects); YFREE(dev->allocatedObjectList); dev->allocatedObjectList = tmp; } dev->freeObjects = NULL; dev->nFreeObjects = 0; } static void yaffs_InitialiseObjects(yaffs_Device * dev) { int i; dev->allocatedObjectList = NULL; dev->freeObjects = NULL; dev->nFreeObjects = 0; for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { INIT_LIST_HEAD(&dev->objectBucket[i].list); dev->objectBucket[i].count = 0; } } static int yaffs_FindNiceObjectBucket(yaffs_Device * dev) { static int x = 0; int i; int l = 999; int lowest = 999999; /* First let's see if we can find one that's empty. */ for (i = 0; i < 10 && lowest > 0; i++) { x++; x %= YAFFS_NOBJECT_BUCKETS; if (dev->objectBucket[x].count < lowest) { lowest = dev->objectBucket[x].count; l = x; } } /* If we didn't find an empty list, then try * looking a bit further for a short one */ for (i = 0; i < 10 && lowest > 3; i++) { x++; x %= YAFFS_NOBJECT_BUCKETS; if (dev->objectBucket[x].count < lowest) { lowest = dev->objectBucket[x].count; l = x; } } 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 list_head *i; __u32 n = (__u32) bucket; /* yaffs_CheckObjectHashSanity(); */ while (!found) { found = 1; n += YAFFS_NOBJECT_BUCKETS; if (1 || dev->objectBucket[bucket].count > 0) { list_for_each(i, &dev->objectBucket[bucket].list) { /* If there is already one in the list */ if (i && list_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; list_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 list_head *i; yaffs_Object *in; list_for_each(i, &dev->objectBucket[bucket].list) { /* Look if it is in the list */ if (i) { in = list_entry(i, yaffs_Object, hashLink); if (in->objectId == number) { /* XXX U-BOOT XXX */ #if 0 #ifdef __KERNEL__ /* Don't tell the VFS about this one if it is defered free */ if (in->deferedFree) return NULL; #endif #endif return in; } } } return NULL; } yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number, yaffs_ObjectType type) { yaffs_Object *theObject; yaffs_Tnode *tn = NULL; if (number < 0) { number = yaffs_CreateNewObjectNumber(dev); } theObject = yaffs_AllocateEmptyObject(dev); if(!theObject) return NULL; if(type == YAFFS_OBJECT_TYPE_FILE){ tn = yaffs_GetTnode(dev); if(!tn){ yaffs_FreeObject(theObject); 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: INIT_LIST_HEAD(&theObject->variant.directoryVariant. children); 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; if (str && *str) { newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR)); if(newStr) yaffs_strcpy(newStr, str); } return newStr; } /* * Mknod (create) a new object. * equivalentObject only has meaning for a hard link; * aliasString only has meaning for a sumlink. * 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; } in = yaffs_CreateNewObject(dev, -1, type); if(type == YAFFS_OBJECT_TYPE_SYMLINK){ str = yaffs_CloneString(aliasString); if(!str){ yaffs_FreeObject(in); return NULL; } } if (in) { in->chunkId = -1; 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; list_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) < 0) { /* Could not create the object header, fail the creation */ yaffs_DestroyObject(in); in = NULL; } } 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 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory" TENDSTR))); YBUG(); } /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */ if (obj->myDev->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)>= 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; yaffs_Object *existingTarget; int force = 0; #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 obj = yaffs_FindObjectByName(oldDir, oldName); /* Check new name to long. */ if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK && yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH) /* ENAMETOOLONG */ return YAFFS_FAIL; else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK && yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH) /* ENAMETOOLONG */ return YAFFS_FAIL; 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 && !list_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 */ yaffs_ChangeObjectName(obj, newDir, newName, force, existingTarget->objectId); yaffs_UnlinkObject(existingTarget); } return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0); } 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->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) { int i; __u32 seq; yaffs_BlockInfo *b; if (!dev->isYaffs2) return 1; /* disqualification only applies to yaffs2. */ if (!bi->hasShrinkHeader) return 1; /* can gc */ /* Find the oldest dirty sequence number if we don't know it and save it * so we don't have to keep recomputing it. */ if (!dev->oldestDirtySequence) { seq = dev->sequenceNumber; for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) { b = yaffs_GetBlockInfo(dev, i); if (b->blockState == YAFFS_BLOCK_STATE_FULL && (b->pagesInUse - b->softDeletions) < dev->nChunksPerBlock && b->sequenceNumber < seq) { seq = b->sequenceNumber; } } dev->oldestDirtySequence = seq; } /* 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); } /* FindDiretiestBlock is used to select the dirtiest block (or close enough) * for garbage collection. */ static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev, int aggressive) { int b = dev->currentDirtyChecker; int i; int iterations; int dirtiest = -1; int pagesInUse = 0; int prioritised=0; yaffs_BlockInfo *bi; int pendingPrioritisedExist = 0; /* First let's see if we need to grab a prioritised block */ if(dev->hasPendingPrioritisedGCs){ for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){ bi = yaffs_GetBlockInfo(dev, i); //yaffs_VerifyBlock(dev,bi,i); if(bi->gcPrioritise) { pendingPrioritisedExist = 1; if(bi->blockState == YAFFS_BLOCK_STATE_FULL && yaffs_BlockNotDisqualifiedFromGC(dev, bi)){ pagesInUse = (bi->pagesInUse - bi->softDeletions); dirtiest = i; prioritised = 1; aggressive = 1; /* Fool the non-aggressive skip logiv below */ } } } if(!pendingPrioritisedExist) /* 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. */ dev->nonAggressiveSkip--; if (!aggressive && (dev->nonAggressiveSkip > 0)) { return -1; } if(!prioritised) pagesInUse = (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1; if (aggressive) { iterations = dev->internalEndBlock - dev->internalStartBlock + 1; } else { iterations = dev->internalEndBlock - dev->internalStartBlock + 1; iterations = iterations / 16; if (iterations > 200) { iterations = 200; } } for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) { b++; if (b < dev->internalStartBlock || b > dev->internalEndBlock) { b = dev->internalStartBlock; } if (b < dev->internalStartBlock || b > dev->internalEndBlock) { T(YAFFS_TRACE_ERROR, (TSTR("**>> Block %d is not valid" TENDSTR), b)); YBUG(); } bi = yaffs_GetBlockInfo(dev, b); #if 0 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) { dirtiest = b; pagesInUse = 0; } else #endif if (bi->blockState == YAFFS_BLOCK_STATE_FULL && (bi->pagesInUse - bi->softDeletions) < pagesInUse && yaffs_BlockNotDisqualifiedFromGC(dev, bi)) { dirtiest = b; pagesInUse = (bi->pagesInUse - bi->softDeletions); } } dev->currentDirtyChecker = b; if (dirtiest > 0) { T(YAFFS_TRACE_GC, (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest, dev->nChunksPerBlock - pagesInUse,prioritised)); } dev->oldestDirtySequence = 0; if (dirtiest > 0) { dev->nonAggressiveSkip = 4; } return dirtiest; } 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" : "")); bi->blockState = YAFFS_BLOCK_STATE_DIRTY; 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->nChunksPerBlock; i++) { if (!yaffs_CheckChunkErased (dev, blockNo * dev->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; 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->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 eraased 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 eraased blocks, but there should have been %d" TENDSTR), dev->nErasedBlocks)); return -1; } // 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 reservedChunks; int reservedBlocks = dev->nReservedBlocks; int checkpointBlocks; checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint; if(checkpointBlocks < 0) checkpointBlocks = 0; reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock); return (dev->nFreeChunks > reservedChunks); } 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)) { /* Not enough space to allocate unless we're allowed to use the reserve. */ return -1; } if (dev->nErasedBlocks < dev->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->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->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->nChunksPerBlock; if (dev->allocationBlock > 0) { n += (dev->nChunksPerBlock - dev->allocationPage); } return n; } static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block) { int oldChunk; int newChunk; int chunkInBlock; int markNAND; int retVal = YAFFS_OK; int cleanups = 0; int i; int isCheckpointBlock; int matchingChunk; 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); bi->blockState = YAFFS_BLOCK_STATE_COLLECTING; T(YAFFS_TRACE_TRACING, (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block, bi->pagesInUse, bi->hasShrinkHeader)); /*yaffs_VerifyFreeChunks(dev); */ bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */ /* Take off the number of soft deleted entries because * they're going to get really deleted during GC. */ dev->nFreeChunks -= bi->softDeletions; dev->isDoingGC = 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); for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock; chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev, block); chunkInBlock++, oldChunk++) { if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) { /* This page is in use and might need to be copied off */ markNAND = 1; yaffs_InitialiseTags(&tags); yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk, buffer, &tags); object = yaffs_FindObjectByNumber(dev, tags.objectId); T(YAFFS_TRACE_GC_DETAIL, (TSTR ("Collecting page %d, %d %d %d " TENDSTR), chunkInBlock, tags.objectId, tags.chunkId, tags.byteCount)); if(object && !yaffs_SkipVerification(dev)){ if(tags.chunkId == 0) matchingChunk = object->chunkId; 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 && tags.chunkId != 0) { /* Data chunk in a 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. */ 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->chunkId = 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 * We no longer want the shrinkHeader flag since its work is done * and if it is left in place it will mess up scanning. * Also, clear out any shadowing stuff */ yaffs_ObjectHeader *oh; oh = (yaffs_ObjectHeader *)buffer; oh->isShrink = 0; oh->shadowsObject = -1; tags.extraShadows = 0; tags.extraIsShrinkHeader = 0; yaffs_VerifyObjectHeader(object,oh,&tags,1); } newChunk = yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1); if (newChunk < 0) { retVal = YAFFS_FAIL; } else { /* Ok, now fix up the Tnodes etc. */ if (tags.chunkId == 0) { /* It's a header */ object->chunkId = newChunk; object->serial = tags.serialNumber; } else { /* It's a data chunk */ yaffs_PutChunkIntoFile (object, tags.chunkId, newChunk, 0); } } } 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 (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) { T(YAFFS_TRACE_GC, (TSTR ("gc did not increase free chunks before %d after %d" TENDSTR), chunksBefore, chunksAfter)); } dev->isDoingGC = 0; return YAFFS_OK; } /* 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 block; int aggressive; int gcOk = YAFFS_OK; int maxTries = 0; int checkpointBlockAdjust; if (dev->isDoingGC) { /* 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 erase of the collected block fails. */ do { maxTries++; checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint); if(checkpointBlockAdjust < 0) checkpointBlockAdjust = 0; if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) { /* We need a block soon...*/ aggressive = 1; } else { /* We're in no hurry */ aggressive = 0; } block = yaffs_FindBlockForGarbageCollection(dev, aggressive); if (block > 0) { dev->garbageCollections++; if (!aggressive) { dev->passiveGarbageCollections++; } T(YAFFS_TRACE_GC, (TSTR ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR), dev->nErasedBlocks, aggressive)); gcOk = yaffs_GarbageCollectBlock(dev, block); } if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) { T(YAFFS_TRACE_GC, (TSTR ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d" TENDSTR), dev->nErasedBlocks, maxTries, block)); } } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0) && (maxTries < 2)); return aggressive ? gcOk : YAFFS_OK; } /*------------------------- TAGS --------------------------------*/ static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId, int chunkInObject) { return (tags->chunkId == chunkInObject && tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0; } /*-------------------- Data file manipulation -----------------*/ 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; if (!tags) { /* Passed a NULL, so use our own tags space */ tags = &localTags; } tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode); if (tn) { theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode); retVal = yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId, chunkInInode); } return retVal; } static int yaffs_FindAndDeleteChunkInFile(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; yaffs_Device *dev = in->myDev; int retVal = -1; if (!tags) { /* Passed a NULL, so use our own tags space */ tags = &localTags; } tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode); if (tn) { theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode); retVal = yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId, chunkInInode); /* Delete the entry in the filestructure (if found) */ if (retVal != -1) { yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0); } } else { /*T(("No level 0 found for %d\n", chunkInInode)); */ } if (retVal == -1) { /* T(("Could not find %d to delete\n",chunkInInode)); */ } return retVal; } #ifdef YAFFS_PARANOID static int yaffs_CheckFileSanity(yaffs_Object * in) { int chunk; int nChunks; int fSize; int failed = 0; int objId; yaffs_Tnode *tn; yaffs_Tags localTags; yaffs_Tags *tags = &localTags; int theChunk; int chunkDeleted; if (in->variantType != YAFFS_OBJECT_TYPE_FILE) { /* T(("Object not a file\n")); */ 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) { theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk); if (yaffs_CheckChunkBits (dev, theChunk / dev->nChunksPerBlock, theChunk % dev->nChunksPerBlock)) { yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk, tags, &chunkDeleted); if (yaffs_TagsMatch (tags, in->objectId, chunk, chunkDeleted)) { /* found it; */ } } else { failed = 1; } } else { /* T(("No level 0 found for %d\n", chunk)); */ } } return failed ? YAFFS_FAIL : 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 */ 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(); } yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__); return YAFFS_OK; } tn = yaffs_AddOrFindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode, NULL); if (!tn) { return YAFFS_FAIL; } existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode); 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 (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. */ if (inScan > 0) { /* Only do this for forward scanning */ yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, NULL, &newTags); /* Do a proper find */ existingChunk = yaffs_FindChunkInFile(in, chunkInInode, &existingTags); } if (existingChunk <= 0) { /*Hoosterman - how did this happen? */ T(YAFFS_TRACE_ERROR, (TSTR ("yaffs tragedy: existing chunk < 0 in scan" TENDSTR))); } /* NB The deleted flags should be false, otherwise the chunks will * not be loaded during a scan */ newSerial = newTags.serialNumber; existingSerial = existingTags.serialNumber; if ((inScan > 0) && (in->myDev->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; } } } if (existingChunk == 0) { in->nDataChunks++; } yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND); return YAFFS_OK; } static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode, __u8 * buffer) { int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL); 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; dev->nDeletions++; block = chunkId / dev->nChunksPerBlock; page = chunkId % dev->nChunksPerBlock; if(!yaffs_CheckChunkBit(dev,block,page)) T(YAFFS_TRACE_VERIFY, (TSTR("Deleting invalid chunk %d"TENDSTR), chunkId)); bi = yaffs_GetBlockInfo(dev, block); T(YAFFS_TRACE_DELETION, (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId)); if (markNAND && bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) { yaffs_InitialiseTags(&tags); tags.chunkDeleted = 1; yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags); yaffs_HandleUpdateChunk(dev, chunkId, &tags); } else { dev->nUnmarkedDeletions++; } /* 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++; yaffs_ClearChunkBit(dev, block, page); bi->pagesInUse--; if (bi->pagesInUse == 0 && !bi->hasShrinkHeader && bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING && bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) { yaffs_BlockBecameDirty(dev, block); } } else { /* T(("Bad news deleting chunk %d\n",chunkId)); */ } } 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 prevChunkId; yaffs_ExtendedTags prevTags; int newChunkId; yaffs_ExtendedTags newTags; yaffs_Device *dev = in->myDev; yaffs_CheckGarbageCollection(dev); /* Get the previous chunk at this location in the file if it exists */ prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags); /* 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; newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags, useReserve); if (newChunkId >= 0) { yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0); if (prevChunkId >= 0) { yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__); } yaffs_CheckFileSanity(in); } return newChunkId; } /* 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_BlockInfo *bi; yaffs_Device *dev = in->myDev; int prevChunkId; int retVal = 0; int result = 0; int newChunkId; yaffs_ExtendedTags newTags; yaffs_ExtendedTags oldTags; __u8 *buffer = NULL; YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1]; yaffs_ObjectHeader *oh = NULL; yaffs_strcpy(oldName,"silly old name"); if (!in->fake || force) { yaffs_CheckGarbageCollection(dev); yaffs_CheckObjectDetailsLoaded(in); buffer = yaffs_GetTempBuffer(in->myDev, __LINE__); oh = (yaffs_ObjectHeader *) buffer; prevChunkId = in->chunkId; if (prevChunkId >= 0) { result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId, buffer, &oldTags); yaffs_VerifyObjectHeader(in,oh,&oldTags,0); memcpy(oldName, oh->name, sizeof(oh->name)); } memset(buffer, 0xFF, dev->nDataBytesPerChunk); oh->type = in->variantType; oh->yst_mode = in->yst_mode; oh->shadowsObject = shadows; #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)); } oh->isShrink = isShrink; switch (in->variantType) { case YAFFS_OBJECT_TYPE_UNKNOWN: /* Should not happen */ break; 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 */ break; case YAFFS_OBJECT_TYPE_DIRECTORY: /* Do nothing */ break; case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_strncpy(oh->alias, in->variant.symLinkVariant.alias, YAFFS_MAX_ALIAS_LENGTH); oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; break; } /* 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); /* Create new chunk in NAND */ newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags, (prevChunkId >= 0) ? 1 : 0); if (newChunkId >= 0) { in->chunkId = newChunkId; if (prevChunkId >= 0) { yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__); } 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-> nChunksPerBlock); bi->hasShrinkHeader = 1; } } retVal = newChunkId; } 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->nShortOpCaches; for(i = 0; i < nCaches; i++){ cache = &dev->srCache[i]; if (cache->object == obj && cache->dirty) return 1; } return 0; } 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->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; } } while (cache && chunkWritten > 0); if (cache) { /* Hoosterman, disk full while writing cache out. */ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache write" TENDSTR))); } } } /*yaffs_FlushEntireDeviceCache(dev) * * */ void yaffs_FlushEntireDeviceCache(yaffs_Device *dev) { yaffs_Object *obj; int nCaches = dev->nShortOpCaches; int i; /* 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; } if(obj) yaffs_FlushFilesChunkCache(obj); } while(obj); } /* 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) { int i; int usage; int theOne; if (dev->nShortOpCaches > 0) { for (i = 0; i < dev->nShortOpCaches; i++) { if (!dev->srCache[i].object) return &dev->srCache[i]; } return NULL; theOne = -1; usage = 0; /* just to stop the compiler grizzling */ for (i = 0; i < dev->nShortOpCaches; i++) { if (!dev->srCache[i].dirty && ((dev->srCache[i].lastUse < usage && theOne >= 0) || theOne < 0)) { usage = dev->srCache[i].lastUse; theOne = i; } } return theOne >= 0 ? &dev->srCache[theOne] : NULL; } else { return NULL; } } static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev) { yaffs_ChunkCache *cache; yaffs_Object *theObj; int usage; int i; int pushout; if (dev->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->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 cache; } else return NULL; } /* Find a cached chunk */ static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj, int chunkId) { yaffs_Device *dev = obj->myDev; int i; if (dev->nShortOpCaches > 0) { for (i = 0; i < dev->nShortOpCaches; i++) { if (dev->srCache[i].object == obj && dev->srCache[i].chunkId == chunkId) { dev->cacheHits++; return &dev->srCache[i]; } } } return NULL; } /* Mark the chunk for the least recently used algorithym */ static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache, int isAWrite) { if (dev->nShortOpCaches > 0) { if (dev->srLastUse < 0 || dev->srLastUse > 100000000) { /* Reset the cache usages */ int i; for (i = 1; i < dev->nShortOpCaches; i++) { dev->srCache[i].lastUse = 0; } dev->srLastUse = 0; } dev->srLastUse++; cache->lastUse = dev->srLastUse; if (isAWrite) { cache->dirty = 1; } } } /* 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->nShortOpCaches > 0) { yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId); if (cache) { cache->object = NULL; } } } /* 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; if (dev->nShortOpCaches > 0) { /* Invalidate it. */ for (i = 0; i < dev->nShortOpCaches; i++) { if (dev->srCache[i].object == in) { dev->srCache[i].object = NULL; } } } } /*--------------------- Checkpointing --------------------*/ static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head) { yaffs_CheckpointValidity cp; memset(&cp,0,sizeof(cp)); cp.structType = sizeof(cp); cp.magic = YAFFS_MAGIC; cp.version = YAFFS_CHECKPOINT_VERSION; cp.head = (head) ? 1 : 0; return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))? 1 : 0; } static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head) { yaffs_CheckpointValidity cp; int ok; ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp)); 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; } 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; cp->nDeletedFiles = dev->nDeletedFiles; cp->nUnlinkedFiles = dev->nUnlinkedFiles; cp->nBackgroundDeletions = dev->nBackgroundDeletions; cp->sequenceNumber = dev->sequenceNumber; cp->oldestDirtySequence = dev->oldestDirtySequence; } 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; dev->nDeletedFiles = cp->nDeletedFiles; dev->nUnlinkedFiles = cp->nUnlinkedFiles; dev->nBackgroundDeletions = cp->nBackgroundDeletions; dev->sequenceNumber = cp->sequenceNumber; dev->oldestDirtySequence = cp->oldestDirtySequence; } static int yaffs_WriteCheckpointDevice(yaffs_Device *dev) { yaffs_CheckpointDevice cp; __u32 nBytes; __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1); int ok; /* Write device runtime values*/ yaffs_DeviceToCheckpointDevice(&cp,dev); cp.structType = sizeof(cp); ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp)); /* Write block info */ if(ok) { nBytes = nBlocks * sizeof(yaffs_BlockInfo); ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes); } /* Write chunk bits */ if(ok) { nBytes = nBlocks * dev->chunkBitmapStride; ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes); } return ok ? 1 : 0; } static int yaffs_ReadCheckpointDevice(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(!ok) return 0; nBytes = nBlocks * dev->chunkBitmapStride; ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes); return ok ? 1 : 0; } static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp, yaffs_Object *obj) { cp->objectId = obj->objectId; cp->parentId = (obj->parent) ? obj->parent->objectId : 0; cp->chunkId = obj->chunkId; 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; 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; } static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp) { yaffs_Object *parent; obj->objectId = cp->objectId; if(cp->parentId) parent = yaffs_FindOrCreateObjectByNumber( obj->myDev, cp->parentId, YAFFS_OBJECT_TYPE_DIRECTORY); else parent = NULL; if(parent) yaffs_AddObjectToDirectory(parent, obj); obj->chunkId = cp->chunkId; 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->objectId >= YAFFS_NOBJECT_BUCKETS) obj->lazyLoaded = 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; int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8; if (tn) { if (level > 0) { for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){ if (tn->internal[i]) { ok = yaffs_CheckpointTnodeWorker(in, tn->internal[i], level - 1, (chunkOffset<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)); } return ok ? 1 : 0; } static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj) { __u32 baseChunk; int ok = 1; yaffs_Device *dev = obj->myDev; yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant; yaffs_Tnode *tn; int nread = 0; ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk)); while(ok && (~baseChunk)){ nread++; /* Read level 0 tnode */ /* printf("read tnode at %d\n",baseChunk); */ tn = yaffs_GetTnodeRaw(dev); if(tn) ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) == (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8); else ok = 0; if(tn && ok){ ok = yaffs_AddOrFindLevel0Tnode(dev, fileStructPtr, baseChunk, tn) ? 1 : 0; } if(ok) ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk)); } T(YAFFS_TRACE_CHECKPOINT,( TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR), nread,baseChunk,ok)); return ok ? 1 : 0; } static int yaffs_WriteCheckpointObjects(yaffs_Device *dev) { yaffs_Object *obj; yaffs_CheckpointObject cp; int i; int ok = 1; struct list_head *lh; /* Iterate through the objects in each hash entry, * dumping them to the checkpointing stream. */ for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){ list_for_each(lh, &dev->objectBucket[i].list) { if (lh) { obj = list_entry(lh, yaffs_Object, hashLink); if (!obj->deferedFree) { yaffs_ObjectToCheckpointObject(&cp,obj); cp.structType = sizeof(cp); T(YAFFS_TRACE_CHECKPOINT,( TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR), cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj)); ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp)); if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){ ok = yaffs_WriteCheckpointTnodes(obj); } } } } } /* 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)); return ok ? 1 : 0; } 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,sizeof(cp),ok)); ok = 0; } T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR), cp.objectId,cp.parentId,cp.variantType,cp.chunkId)); if(ok && cp.objectId == ~0) done = 1; else if(ok){ obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType); if(obj) { yaffs_CheckpointObjectToObject(obj,&cp); if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) { ok = yaffs_ReadCheckpointTnodes(obj); } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) { obj->hardLinks.next = (struct list_head *) hardList; hardList = obj; } } } } if(ok) yaffs_HardlinkFixup(dev,hardList); return ok ? 1 : 0; } static int yaffs_WriteCheckpointSum(yaffs_Device *dev) { __u32 checkpointSum; int ok; yaffs_GetCheckpointSum(dev,&checkpointSum); ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum)); if(!ok) return 0; return 1; } static int yaffs_ReadCheckpointSum(yaffs_Device *dev) { __u32 checkpointSum0; __u32 checkpointSum1; int ok; yaffs_GetCheckpointSum(dev,&checkpointSum0); ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1)); if(!ok) return 0; if(checkpointSum0 != checkpointSum1) return 0; return 1; } static int yaffs_WriteCheckpointData(yaffs_Device *dev) { int ok = 1; if(dev->skipCheckpointWrite || !dev->isYaffs2){ T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR))); ok = 0; } if(ok) ok = yaffs_CheckpointOpen(dev,1); 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); } if(ok){ ok = yaffs_WriteCheckpointSum(dev); } if(!yaffs_CheckpointClose(dev)) ok = 0; if(ok) dev->isCheckpointed = 1; else dev->isCheckpointed = 0; return dev->isCheckpointed; } static int yaffs_ReadCheckpointData(yaffs_Device *dev) { int ok = 1; if(dev->skipCheckpointRead || !dev->isYaffs2){ T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR))); ok = 0; } if(ok) ok = yaffs_CheckpointOpen(dev,0); /* open for read */ 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); } if(ok){ ok = yaffs_ReadCheckpointSum(dev); T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok)); } if(!yaffs_CheckpointClose(dev)) ok = 0; if(ok) dev->isCheckpointed = 1; else dev->isCheckpointed = 0; return ok ? 1 : 0; } static void yaffs_InvalidateCheckpoint(yaffs_Device *dev) { if(dev->isCheckpointed || dev->blocksInCheckpoint > 0){ dev->isCheckpointed = 0; yaffs_CheckpointInvalidateStream(dev); if(dev->superBlock && dev->markSuperBlockDirty) dev->markSuperBlockDirty(dev->superBlock); } } int yaffs_CheckpointSave(yaffs_Device *dev) { T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed)); yaffs_VerifyObjects(dev); yaffs_VerifyBlocks(dev); yaffs_VerifyFreeChunks(dev); if(!dev->isCheckpointed) { yaffs_InvalidateCheckpoint(dev); yaffs_WriteCheckpointData(dev); } T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed)); return dev->isCheckpointed; } int yaffs_CheckpointRestore(yaffs_Device *dev) { int retval; T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed)); retval = yaffs_ReadCheckpointData(dev); if(dev->isCheckpointed){ yaffs_VerifyObjects(dev); yaffs_VerifyBlocks(dev); yaffs_VerifyFreeChunks(dev); } T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed)); return retval; } /*--------------------- 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. */ int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset, int nBytes) { __u32 chunk; __u32 start; int nToCopy; int n = nBytes; int nDone = 0; yaffs_ChunkCache *cache; yaffs_Device *dev; dev = in->myDev; while (n > 0) { //chunk = offset / dev->nDataBytesPerChunk + 1; //start = offset % dev->nDataBytesPerChunk; yaffs_AddrToChunk(dev,offset,&chunk,&start); chunk++; /* 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; } cache = yaffs_FindChunkCache(in, chunk); /* If the chunk is already in the cache or it is less than a whole chunk * then use the cache (if there is caching) * else bypass the cache. */ if (cache || nToCopy != dev->nDataBytesPerChunk) { if (dev->nShortOpCaches > 0) { /* 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; } yaffs_UseChunkCache(dev, cache, 0); cache->locked = 1; #ifdef CONFIG_YAFFS_WINCE yfsd_UnlockYAFFS(TRUE); #endif memcpy(buffer, &cache->data[start], nToCopy); #ifdef CONFIG_YAFFS_WINCE yfsd_LockYAFFS(TRUE); #endif cache->locked = 0; } else { /* Read into the local buffer then copy..*/ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__); yaffs_ReadChunkDataFromObject(in, chunk, localBuffer); #ifdef CONFIG_YAFFS_WINCE yfsd_UnlockYAFFS(TRUE); #endif memcpy(buffer, &localBuffer[start], nToCopy); #ifdef CONFIG_YAFFS_WINCE yfsd_LockYAFFS(TRUE); #endif yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__); } } else { #ifdef CONFIG_YAFFS_WINCE __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__); /* Under WinCE can't do direct transfer. Need to use a local buffer. * This is because we otherwise screw up WinCE's memory mapper */ yaffs_ReadChunkDataFromObject(in, chunk, localBuffer); #ifdef CONFIG_YAFFS_WINCE yfsd_UnlockYAFFS(TRUE); #endif memcpy(buffer, localBuffer, dev->nDataBytesPerChunk); #ifdef CONFIG_YAFFS_WINCE yfsd_LockYAFFS(TRUE); yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__); #endif #else /* A full chunk. Read directly into the supplied buffer. */ yaffs_ReadChunkDataFromObject(in, chunk, buffer); #endif } n -= nToCopy; offset += nToCopy; buffer += nToCopy; nDone += nToCopy; } return nDone; } int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset, int nBytes, int writeThrough) { __u32 chunk; __u32 start; int nToCopy; int n = nBytes; int nDone = 0; int nToWriteBack; int startOfWrite = offset; int chunkWritten = 0; int nBytesRead; yaffs_Device *dev; dev = in->myDev; while (n > 0 && chunkWritten >= 0) { //chunk = offset / dev->nDataBytesPerChunk + 1; //start = offset % dev->nDataBytesPerChunk; yaffs_AddrToChunk(dev,offset,&chunk,&start); chunk++; /* OK now check for the curveball where the start and end are in * the same chunk. */ if ((start + n) < dev->nDataBytesPerChunk) { nToCopy = n; /* 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. */ nBytesRead = in->variant.fileVariant.fileSize - ((chunk - 1) * dev->nDataBytesPerChunk); if (nBytesRead > dev->nDataBytesPerChunk) { nBytesRead = dev->nDataBytesPerChunk; } nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start + n); } else { nToCopy = dev->nDataBytesPerChunk - start; nToWriteBack = dev->nDataBytesPerChunk; } if (nToCopy != dev->nDataBytesPerChunk) { /* An incomplete start or end chunk (or maybe both start and end chunk) */ if (dev->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(in-> myDev)) { cache = yaffs_GrabChunkCache(in->myDev); 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(in->myDev)){ /* Drop the cache if it was a read cache item and * no space check has been made for it. */ cache = NULL; } if (cache) { yaffs_UseChunkCache(dev, cache, 1); cache->locked = 1; #ifdef CONFIG_YAFFS_WINCE yfsd_UnlockYAFFS(TRUE); #endif memcpy(&cache->data[start], buffer, nToCopy); #ifdef CONFIG_YAFFS_WINCE yfsd_LockYAFFS(TRUE); #endif cache->locked = 0; cache->nBytes = nToWriteBack; if (writeThrough) { chunkWritten = yaffs_WriteChunkDataToObject (cache->object, cache->chunkId, cache->data, cache->nBytes, 1); cache->dirty = 0; } } 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. */ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__); yaffs_ReadChunkDataFromObject(in, chunk, localBuffer); #ifdef CONFIG_YAFFS_WINCE yfsd_UnlockYAFFS(TRUE); #endif memcpy(&localBuffer[start], buffer, nToCopy); #ifdef CONFIG_YAFFS_WINCE yfsd_LockYAFFS(TRUE); #endif chunkWritten = yaffs_WriteChunkDataToObject(in, chunk, localBuffer, nToWriteBack, 0); yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__); } } else { #ifdef CONFIG_YAFFS_WINCE /* Under WinCE can't do direct transfer. Need to use a local buffer. * This is because we otherwise screw up WinCE's memory mapper */ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__); #ifdef CONFIG_YAFFS_WINCE yfsd_UnlockYAFFS(TRUE); #endif memcpy(localBuffer, buffer, dev->nDataBytesPerChunk); #ifdef CONFIG_YAFFS_WINCE yfsd_LockYAFFS(TRUE); #endif chunkWritten = yaffs_WriteChunkDataToObject(in, chunk, localBuffer, dev->nDataBytesPerChunk, 0); yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__); #else /* A full chunk. Write directly from the supplied buffer. */ chunkWritten = yaffs_WriteChunkDataToObject(in, chunk, buffer, dev->nDataBytesPerChunk, 0); #endif /* Since we've overwritten the cached data, we better invalidate it. */ yaffs_InvalidateChunkCache(in, chunk); } if (chunkWritten >= 0) { n -= nToCopy; offset += nToCopy; buffer += nToCopy; nDone += nToCopy; } } /* Update file object */ if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) { in->variant.fileVariant.fileSize = (startOfWrite + nDone); } in->dirty = 1; return nDone; } /* ---------------------- File resizing stuff ------------------ */ static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize) { yaffs_Device *dev = in->myDev; int oldFileSize = in->variant.fileVariant.fileSize; int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk; int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) / dev->nDataBytesPerChunk; int i; int chunkId; /* 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 */ chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL); if (chunkId > 0) { if (chunkId < (dev->internalStartBlock * dev->nChunksPerBlock) || chunkId >= ((dev->internalEndBlock + 1) * dev->nChunksPerBlock)) { T(YAFFS_TRACE_ALWAYS, (TSTR("Found daft chunkId %d for %d" TENDSTR), chunkId, i)); } else { in->nDataChunks--; yaffs_DeleteChunk(dev, chunkId, 1, __LINE__); } } } } int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize) { int oldFileSize = in->variant.fileVariant.fileSize; __u32 newSizeOfPartialChunk; __u32 newFullChunks; yaffs_Device *dev = in->myDev; yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk); yaffs_FlushFilesChunkCache(in); yaffs_InvalidateWholeChunkCache(in); yaffs_CheckGarbageCollection(dev); if (in->variantType != YAFFS_OBJECT_TYPE_FILE) { return yaffs_GetFileSize(in); } if (newSize == oldFileSize) { return oldFileSize; } if (newSize < oldFileSize) { yaffs_PruneResizedChunks(in, newSize); if (newSizeOfPartialChunk != 0) { int lastChunk = 1 + newFullChunks; __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__); /* Got to read and rewrite the last chunk with its new size and zero pad */ yaffs_ReadChunkDataFromObject(in, lastChunk, localBuffer); memset(localBuffer + newSizeOfPartialChunk, 0, dev->nDataBytesPerChunk - newSizeOfPartialChunk); yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer, newSizeOfPartialChunk, 1); yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__); } in->variant.fileVariant.fileSize = newSize; yaffs_PruneFileStructure(dev, &in->variant.fileVariant); } else { /* newsSize > oldFileSize */ in->variant.fileVariant.fileSize = newSize; } /* Write a new object header. * show we've shrunk the file, if need be * Do this only if the file is not in the deleted directories. */ if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED && in->parent->objectId != YAFFS_OBJECTID_DELETED) { yaffs_UpdateObjectHeader(in, NULL, 0, (newSize < oldFileSize) ? 1 : 0, 0); } return YAFFS_OK; } loff_t yaffs_GetFileSize(yaffs_Object * obj) { obj = yaffs_GetEquivalentObject(obj); switch (obj->variantType) { case YAFFS_OBJECT_TYPE_FILE: return obj->variant.fileVariant.fileSize; case YAFFS_OBJECT_TYPE_SYMLINK: return yaffs_strlen(obj->variant.symLinkVariant.alias); default: return 0; } } int yaffs_FlushFile(yaffs_Object * in, int updateTime) { int retVal; if (in->dirty) { yaffs_FlushFilesChunkCache(in); if (updateTime) { #ifdef CONFIG_YAFFS_WINCE yfsd_WinFileTimeNow(in->win_mtime); #else in->yst_mtime = Y_CURRENT_TIME; #endif } retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >= 0) ? YAFFS_OK : YAFFS_FAIL; } else { retVal = YAFFS_OK; } return retVal; } static int yaffs_DoGenericObjectDeletion(yaffs_Object * in) { /* First off, invalidate the file's data in the cache, without flushing. */ yaffs_InvalidateWholeChunkCache(in); if (in->myDev->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,"deleted", 0, 0); } yaffs_RemoveObjectFromDirectory(in); yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__); in->chunkId = -1; 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_UnlinkFile(yaffs_Object * in) { int retVal; int immediateDeletion = 0; if (1) { /* XXX U-BOOT XXX */ #if 0 #ifdef __KERNEL__ if (!in->myInode) { immediateDeletion = 1; } #endif #else if (in->inUse <= 0) { immediateDeletion = 1; } #endif if (immediateDeletion) { retVal = yaffs_ChangeObjectName(in, in->myDev->deletedDir, "deleted", 0, 0); T(YAFFS_TRACE_TRACING, (TSTR("yaffs: immediate deletion of file %d" TENDSTR), in->objectId)); in->deleted = 1; in->myDev->nDeletedFiles++; if (0 && in->myDev->isYaffs2) { yaffs_ResizeFile(in, 0); } yaffs_SoftDeleteFile(in); } else { retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir, "unlinked", 0, 0); } } return retVal; } int yaffs_DeleteFile(yaffs_Object * in) { int retVal = YAFFS_OK; if (in->nDataChunks > 0) { /* Use soft deletion if there is data in the file */ if (!in->unlinked) { retVal = yaffs_UnlinkFile(in); } if (retVal == YAFFS_OK && in->unlinked && !in->deleted) { in->deleted = 1; in->myDev->nDeletedFiles++; yaffs_SoftDeleteFile(in); } return in->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); return YAFFS_OK; } } static int yaffs_DeleteDirectory(yaffs_Object * in) { /* First check that the directory is empty. */ if (list_empty(&in->variant.directoryVariant.children)) { return yaffs_DoGenericObjectDeletion(in); } return YAFFS_FAIL; } static int yaffs_DeleteSymLink(yaffs_Object * in) { YFREE(in->variant.symLinkVariant.alias); return yaffs_DoGenericObjectDeletion(in); } static int yaffs_DeleteHardLink(yaffs_Object * in) { /* remove this hardlink from the list assocaited with the equivalent * object */ list_del(&in->hardLinks); return yaffs_DoGenericObjectDeletion(in); } static void yaffs_DestroyObject(yaffs_Object * obj) { switch (obj->variantType) { case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break; case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break; case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break; case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break; case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break; case YAFFS_OBJECT_TYPE_UNKNOWN: break; /* should not happen. */ } } static int yaffs_UnlinkWorker(yaffs_Object * obj) { if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) { return yaffs_DeleteHardLink(obj); } else if (!list_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 * - Unhook it from its parent directory (so that the rename can work) * - Rename the object to the hardlink's name. * - Delete the hardlink */ yaffs_Object *hl; int retVal; YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks); list_del_init(&hl->hardLinks); list_del_init(&hl->siblings); yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1); retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0); if (retVal == YAFFS_OK) { retVal = yaffs_DoGenericObjectDeletion(hl); } return retVal; } else { switch (obj->variantType) { case YAFFS_OBJECT_TYPE_FILE: return yaffs_UnlinkFile(obj); break; case YAFFS_OBJECT_TYPE_DIRECTORY: 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; } } } static int yaffs_UnlinkObject( yaffs_Object *obj) { if (obj && obj->unlinkAllowed) { return yaffs_UnlinkWorker(obj); } return YAFFS_FAIL; } int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name) { yaffs_Object *obj; obj = yaffs_FindObjectByName(dir, name); return yaffs_UnlinkObject(obj); } /*----------------------- Initialisation Scanning ---------------------- */ static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId, int backwardScanning) { yaffs_Object *obj; if (!backwardScanning) { /* Handle YAFFS1 forward scanning case * For YAFFS1 we always do the deletion */ } else { /* Handle YAFFS2 case (backward scanning) * If the shadowed object exists then ignore. */ if (yaffs_FindObjectByNumber(dev, objId)) { return; } } /* 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); 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 */ } typedef struct { int seq; int block; } yaffs_BlockIndex; 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); in = yaffs_FindObjectByNumber(dev, hl->variant.hardLinkVariant. equivalentObjectId); if (in) { /* Add the hardlink pointers */ hl->variant.hardLinkVariant.equivalentObject = in; list_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; INIT_LIST_HEAD(&hl->hardLinks); } } } static int ybicmp(const void *a, const void *b){ 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; } static int yaffs_Scan(yaffs_Device * dev) { yaffs_ExtendedTags tags; int blk; int blockIterator; int startIterator; int endIterator; int nBlocksToScan = 0; int result; int chunk; int c; int deleted; yaffs_BlockState state; yaffs_Object *hardList = NULL; yaffs_BlockInfo *bi; int sequenceNumber; yaffs_ObjectHeader *oh; yaffs_Object *in; yaffs_Object *parent; int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1; int alloc_failed = 0; __u8 *chunkData; yaffs_BlockIndex *blockIndex = NULL; if (dev->isYaffs2) { T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR))); return YAFFS_FAIL; } //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format. T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR), dev->internalStartBlock, dev->internalEndBlock)); chunkData = yaffs_GetTempBuffer(dev, __LINE__); dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER; if (dev->isYaffs2) { blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex)); if(!blockIndex) return YAFFS_FAIL; } /* Scan all the blocks to determine their state */ for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) { bi = yaffs_GetBlockInfo(dev, blk); yaffs_ClearChunkBits(dev, blk); bi->pagesInUse = 0; bi->softDeletions = 0; yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber); bi->blockState = state; bi->sequenceNumber = sequenceNumber; T(YAFFS_TRACE_SCAN_DEBUG, (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk, state, sequenceNumber)); 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->nChunksPerBlock; } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) { /* Determine the highest sequence number */ if (dev->isYaffs2 && sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER && sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) { blockIndex[nBlocksToScan].seq = sequenceNumber; blockIndex[nBlocksToScan].block = blk; nBlocksToScan++; if (sequenceNumber >= dev->sequenceNumber) { dev->sequenceNumber = sequenceNumber; } } else if (dev->isYaffs2) { /* TODO: Nasty sequence number! */ T(YAFFS_TRACE_SCAN, (TSTR ("Block scanning block %d has bad sequence number %d" TENDSTR), blk, sequenceNumber)); } } } /* Sort the blocks * Dungy old bubble sort for now... */ if (dev->isYaffs2) { 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; } } /* Now scan the blocks looking at the data. */ if (dev->isYaffs2) { startIterator = 0; endIterator = nBlocksToScan - 1; T(YAFFS_TRACE_SCAN_DEBUG, (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan)); } else { startIterator = dev->internalStartBlock; endIterator = dev->internalEndBlock; } /* For each block.... */ for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator; blockIterator++) { if (dev->isYaffs2) { /* get the block to scan in the correct order */ blk = blockIndex[blockIterator].block; } else { blk = blockIterator; } bi = yaffs_GetBlockInfo(dev, blk); state = bi->blockState; deleted = 0; /* For each chunk in each block that needs scanning....*/ for (c = 0; !alloc_failed && c < dev->nChunksPerBlock && state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) { /* Read the tags and decide what to do */ chunk = blk * dev->nChunksPerBlock + c; result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL, &tags); /* Let's have a good look at this chunk... */ if (!dev->isYaffs2 && 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 */ 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 it to here to encourage the allocator to go forth from here. */ /* Yaffs2 sanity check: * This should be the one with the highest sequence number */ if (dev->isYaffs2 && (dev->sequenceNumber != bi->sequenceNumber)) { T(YAFFS_TRACE_ALWAYS, (TSTR ("yaffs: Allocation block %d was not highest sequence id:" " block seq = %d, dev seq = %d" TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber)); } } dev->nFreeChunks += (dev->nChunksPerBlock - c); } else if (tags.chunkId > 0) { /* chunkId > 0 so it is a data chunk... */ unsigned int endpos; yaffs_SetChunkBit(dev, blk, c); bi->pagesInUse++; in = yaffs_FindOrCreateObjectByNumber(dev, tags. objectId, YAFFS_OBJECT_TYPE_FILE); /* PutChunkIntoFile checks for a clash (two data chunks with * the same chunkId). */ if(!in) alloc_failed = 1; if(in){ if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1)) alloc_failed = 1; } 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->useHeaderFileSize) { in->variant.fileVariant. fileSize = in->variant.fileVariant. scannedFileSize; } } /* 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); oh = (yaffs_ObjectHeader *) chunkData; 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_DestroyObject(in); in = 0; } in = yaffs_FindOrCreateObjectByNumber(dev, tags. objectId, oh->type); if(!in) alloc_failed = 1; if (in && oh->shadowsObject > 0) { yaffs_HandleShadowedObject(dev, oh-> shadowsObject, 0); } if (in && in->valid) { /* We have already filled this one. We have a duplicate and need to resolve it. */ unsigned existingSerial = in->serial; unsigned newSerial = tags.serialNumber; if (dev->isYaffs2 || ((existingSerial + 1) & 3) == newSerial) { /* Use new one - destroy the exisiting one */ yaffs_DeleteChunk(dev, in->chunkId, 1, __LINE__); in->valid = 0; } else { /* Use existing - destroy this one. */ yaffs_DeleteChunk(dev, chunk, 1, __LINE__); } } 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->chunkId = chunk; } else if (in && !in->valid) { /* we need to load this info */ 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->chunkId = chunk; yaffs_SetObjectName(in, oh->name); in->dirty = 0; /* directory stuff... * hook up to parent */ parent = yaffs_FindOrCreateObjectByNumber (dev, oh->parentObjectId, YAFFS_OBJECT_TYPE_DIRECTORY); if (parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN) { /* Set up as a directory */ parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY; INIT_LIST_HEAD(&parent->variant. directoryVariant. children); } else if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { /* Hoosterman, another problem.... * We're trying to use a non-directory as a directory */ 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; } yaffs_AddObjectToDirectory(parent, in); 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. */ switch (in->variantType) { case YAFFS_OBJECT_TYPE_UNKNOWN: /* Todo got a problem */ break; case YAFFS_OBJECT_TYPE_FILE: if (dev->isYaffs2 && oh->isShrink) { /* Prune back the shrunken chunks */ yaffs_PruneResizedChunks (in, oh->fileSize); /* Mark the block as having a shrinkHeader */ bi->hasShrinkHeader = 1; } if (dev->useHeaderFileSize) in->variant.fileVariant. fileSize = oh->fileSize; break; case YAFFS_OBJECT_TYPE_HARDLINK: in->variant.hardLinkVariant. equivalentObjectId = oh->equivalentObjectId; in->hardLinks.next = (struct list_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; } if (parent == dev->deletedDir) { yaffs_DestroyObject(in); bi->hasShrinkHeader = 1; } } } } 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); } } if (blockIndex) { 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); /* Handle the unlinked files. Since they were left in an unlinked state we should * just delete them. */ { struct list_head *i; struct list_head *n; yaffs_Object *l; /* Soft delete all the unlinked files */ list_for_each_safe(i, n, &dev->unlinkedDir->variant.directoryVariant. children) { if (i) { l = list_entry(i, yaffs_Object, siblings); yaffs_DestroyObject(l); } } } yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__); if(alloc_failed){ return YAFFS_FAIL; } T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR))); return YAFFS_OK; } static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in) { __u8 *chunkData; yaffs_ObjectHeader *oh; yaffs_Device *dev = in->myDev; yaffs_ExtendedTags tags; int result; int alloc_failed = 0; if(!in) return; #if 0 T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR), in->objectId, in->lazyLoaded ? "not yet" : "already")); #endif if(in->lazyLoaded){ in->lazyLoaded = 0; chunkData = yaffs_GetTempBuffer(dev, __LINE__); result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,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_SetObjectName(in, oh->name); 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__); } } static int yaffs_ScanBackwards(yaffs_Device * dev) { 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; int sequenceNumber; yaffs_ObjectHeader *oh; yaffs_Object *in; yaffs_Object *parent; int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1; int itsUnlinked; __u8 *chunkData; int fileSize; int isShrink; int foundChunksInBlock; int equivalentObjectId; int alloc_failed = 0; yaffs_BlockIndex *blockIndex = NULL; int altBlockIndex = 0; if (!dev->isYaffs2) { T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR))); return YAFFS_FAIL; } T(YAFFS_TRACE_SCAN, (TSTR ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..." TENDSTR), dev->internalStartBlock, dev->internalEndBlock)); dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER; blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex)); if(!blockIndex) { blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex)); altBlockIndex = 1; } 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__); /* Scan all the blocks to determine their state */ for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) { bi = yaffs_GetBlockInfo(dev, blk); yaffs_ClearChunkBits(dev, blk); bi->pagesInUse = 0; bi->softDeletions = 0; yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber); bi->blockState = state; bi->sequenceNumber = sequenceNumber; if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA) bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT; T(YAFFS_TRACE_SCAN_DEBUG, (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk, state, sequenceNumber)); if(state == YAFFS_BLOCK_STATE_CHECKPOINT){ dev->blocksInCheckpoint++; } 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->nChunksPerBlock; } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) { /* Determine the highest sequence number */ if (dev->isYaffs2 && sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER && sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) { blockIndex[nBlocksToScan].seq = sequenceNumber; blockIndex[nBlocksToScan].block = blk; nBlocksToScan++; if (sequenceNumber >= dev->sequenceNumber) { dev->sequenceNumber = sequenceNumber; } } else if (dev->isYaffs2) { /* TODO: Nasty sequence number! */ T(YAFFS_TRACE_SCAN, (TSTR ("Block scanning block %d has bad sequence number %d" TENDSTR), blk, sequenceNumber)); } } } T(YAFFS_TRACE_SCAN, (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan)); YYIELD(); /* Sort the blocks */ #ifndef CONFIG_YAFFS_USE_OWN_SORT { /* Use qsort now. */ yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp); } #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; } } #endif YYIELD(); 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)); /* 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(); /* get the block to scan in the correct order */ blk = blockIndex[blockIterator].block; bi = yaffs_GetBlockInfo(dev, blk); state = bi->blockState; deleted = 0; /* For each chunk in each block that needs scanning.... */ foundChunksInBlock = 0; for (c = dev->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 */ chunk = blk * dev->nChunksPerBlock + c; result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL, &tags); /* Let's have a good look at this chunk... */ 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. This block must have * had a write failure, so set up for retirement. */ bi->needsRetiring = 1; bi->gcPrioritise = 1; T(YAFFS_TRACE_ALWAYS, (TSTR("Partially written block %d being set for retirement" TENDSTR), blk)); } } } dev->nFreeChunks++; } else if (tags.chunkId > 0) { /* chunkId > 0 so it is a data chunk... */ unsigned int endpos; __u32 chunkBase = (tags.chunkId - 1) * dev->nDataBytesPerChunk; foundChunksInBlock = 1; yaffs_SetChunkBit(dev, blk, c); bi->pagesInUse++; in = yaffs_FindOrCreateObjectByNumber(dev, tags. objectId, YAFFS_OBJECT_TYPE_FILE); if(!in){ /* Out of memory */ alloc_failed = 1; } 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; } /* 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 = (tags.chunkId - 1) * dev->nDataBytesPerChunk + tags.byteCount; if (!in->valid && /* have not got an object header yet */ in->variant.fileVariant. scannedFileSize < endpos) { in->variant.fileVariant. scannedFileSize = endpos; in->variant.fileVariant. fileSize = in->variant.fileVariant. scannedFileSize; } } else if(in) { /* This chunk has been invalidated by a resize, so delete */ yaffs_DeleteChunk(dev, chunk, 1, __LINE__); } } else { /* chunkId == 0, so it is an ObjectHeader. * Thus, we read in the object header and make the object */ foundChunksInBlock = 1; yaffs_SetChunkBit(dev, blk, c); bi->pagesInUse++; oh = NULL; in = NULL; if (tags.extraHeaderInfoAvailable) { in = yaffs_FindOrCreateObjectByNumber (dev, tags.objectId, tags.extraObjectType); } if (!in || #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD !in->valid || #endif tags.extraShadows || (!in->valid && (tags.objectId == YAFFS_OBJECTID_ROOT || tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) ) { /* 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. */ result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, chunkData, NULL); oh = (yaffs_ObjectHeader *) chunkData; if (!in) in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type); } 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)); } 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; unsigned 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; } if (isShrink && in->variant.fileVariant. shrinkSize > thisSize) { in->variant.fileVariant. shrinkSize = thisSize; } if (isShrink) { bi->hasShrinkHeader = 1; } } /* Use existing - destroy this one. */ yaffs_DeleteChunk(dev, chunk, 1, __LINE__); } 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; #endif } else { in->variantType = tags.extraObjectType; in->lazyLoaded = 1; } in->chunkId = chunk; } else if (!in->valid) { /* we need to load this info */ in->valid = 1; in->chunkId = chunk; 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); yaffs_SetObjectName(in, oh->name); parent = yaffs_FindOrCreateObjectByNumber (dev, oh->parentObjectId, YAFFS_OBJECT_TYPE_DIRECTORY); fileSize = oh->fileSize; isShrink = oh->isShrink; equivalentObjectId = oh->equivalentObjectId; } 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; /* directory stuff... * hook up to parent */ if (parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN) { /* Set up as a directory */ parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY; INIT_LIST_HEAD(&parent->variant. directoryVariant. children); } else if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { /* Hoosterman, another problem.... * We're trying to use a non-directory as a directory */ 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; } yaffs_AddObjectToDirectory(parent, in); itsUnlinked = (parent == dev->deletedDir) || (parent == dev->unlinkedDir); if (isShrink) { /* Mark the block as having a shrinkHeader */ bi->hasShrinkHeader = 1; } /* 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. */ 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 = in->variant.fileVariant.fileSize; } if (isShrink && in->variant.fileVariant.shrinkSize > fileSize) { in->variant.fileVariant.shrinkSize = fileSize; } break; case YAFFS_OBJECT_TYPE_HARDLINK: if(!itsUnlinked) { in->variant.hardLinkVariant.equivalentObjectId = equivalentObjectId; in->hardLinks.next = (struct list_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; } } } } /* 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); } } 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); /* * Sort out state of unlinked and deleted objects. */ { struct list_head *i; struct list_head *n; yaffs_Object *l; /* Soft delete all the unlinked files */ list_for_each_safe(i, n, &dev->unlinkedDir->variant.directoryVariant. children) { if (i) { l = list_entry(i, yaffs_Object, siblings); yaffs_DestroyObject(l); } } /* Soft delete all the deletedDir files */ list_for_each_safe(i, n, &dev->deletedDir->variant.directoryVariant. children) { if (i) { l = list_entry(i, yaffs_Object, siblings); yaffs_DestroyObject(l); } } } 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_RemoveObjectFromDirectory(yaffs_Object * obj) { yaffs_Device *dev = obj->myDev; if(dev && dev->removeObjectCallback) dev->removeObjectCallback(obj); list_del_init(&obj->siblings); obj->parent = NULL; } static void yaffs_AddObjectToDirectory(yaffs_Object * directory, yaffs_Object * obj) { if (!directory) { T(YAFFS_TRACE_ALWAYS, (TSTR ("tragedy: Trying to add an object to a null pointer directory" TENDSTR))); YBUG(); } if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { T(YAFFS_TRACE_ALWAYS, (TSTR ("tragedy: Trying to add an object to a non-directory" TENDSTR))); YBUG(); } if (obj->siblings.prev == NULL) { /* Not initialised */ INIT_LIST_HEAD(&obj->siblings); } else if (!list_empty(&obj->siblings)) { /* If it is holed up somewhere else, un hook it */ yaffs_RemoveObjectFromDirectory(obj); } /* Now add it */ list_add(&obj->siblings, &directory->variant.directoryVariant.children); obj->parent = directory; if (directory == obj->myDev->unlinkedDir || directory == obj->myDev->deletedDir) { obj->unlinked = 1; obj->myDev->nUnlinkedFiles++; obj->renameAllowed = 0; } } yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory, const YCHAR * name) { int sum; struct list_head *i; YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1]; yaffs_Object *l; if (!name) { return NULL; } if (!directory) { T(YAFFS_TRACE_ALWAYS, (TSTR ("tragedy: yaffs_FindObjectByName: null pointer directory" TENDSTR))); YBUG(); } if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { T(YAFFS_TRACE_ALWAYS, (TSTR ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR))); YBUG(); } sum = yaffs_CalcNameSum(name); list_for_each(i, &directory->variant.directoryVariant.children) { if (i) { l = list_entry(i, yaffs_Object, siblings); yaffs_CheckObjectDetailsLoaded(l); /* Special case for lost-n-found */ if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) { if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) { return l; } } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0) { /* LostnFound cunk called Objxxx * Do a real check */ yaffs_GetObjectName(l, buffer, YAFFS_MAX_NAME_LENGTH); if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) { return l; } } } } return NULL; } #if 0 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir, int (*fn) (yaffs_Object *)) { struct list_head *i; yaffs_Object *l; if (!theDir) { T(YAFFS_TRACE_ALWAYS, (TSTR ("tragedy: yaffs_FindObjectByName: null pointer directory" TENDSTR))); YBUG(); } if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) { T(YAFFS_TRACE_ALWAYS, (TSTR ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR))); YBUG(); } list_for_each(i, &theDir->variant.directoryVariant.children) { if (i) { l = list_entry(i, yaffs_Object, siblings); if (l && !fn(l)) { return YAFFS_FAIL; } } } return YAFFS_OK; } #endif /* GetEquivalentObject dereferences any hard links to get to the * actual object. */ yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj) { if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) { /* We want the object id of the equivalent object, not this one */ obj = obj->variant.hardLinkVariant.equivalentObject; yaffs_CheckObjectDetailsLoaded(obj); } return obj; } 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); } else if (obj->chunkId <= 0) { YCHAR locName[20]; /* make up a name */ yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX, obj->objectId); yaffs_strncpy(name, locName, buffSize - 1); } #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM else if (obj->shortName[0]) { yaffs_strcpy(name, obj->shortName); } #endif else { int result; __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__); yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer; memset(buffer, 0, obj->myDev->nDataBytesPerChunk); if (obj->chunkId >= 0) { result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev, obj->chunkId, buffer, NULL); } yaffs_strncpy(name, oh->name, buffSize - 1); yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__); } return yaffs_strlen(name); } int yaffs_GetObjectFileLength(yaffs_Object * obj) { /* Dereference any hard linking */ obj = yaffs_GetEquivalentObject(obj); if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) { return obj->variant.fileVariant.fileSize; } if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) { return yaffs_strlen(obj->variant.symLinkVariant.alias); } else { /* Only a directory should drop through to here */ return obj->myDev->nDataBytesPerChunk; } } int yaffs_GetObjectLinkCount(yaffs_Object * obj) { int count = 0; struct list_head *i; if (!obj->unlinked) { count++; /* the object itself */ } list_for_each(i, &obj->hardLinks) { count++; /* add the hard links; */ } return count; } int yaffs_GetObjectInode(yaffs_Object * obj) { obj = yaffs_GetEquivalentObject(obj); return obj->objectId; } unsigned yaffs_GetObjectType(yaffs_Object * obj) { obj = yaffs_GetEquivalentObject(obj); switch (obj->variantType) { case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break; case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break; case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break; case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break; case YAFFS_OBJECT_TYPE_SPECIAL: if (S_ISFIFO(obj->yst_mode)) return DT_FIFO; if (S_ISCHR(obj->yst_mode)) return DT_CHR; if (S_ISBLK(obj->yst_mode)) return DT_BLK; if (S_ISSOCK(obj->yst_mode)) return DT_SOCK; default: return DT_REG; break; } } YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj) { obj = yaffs_GetEquivalentObject(obj); if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) { return yaffs_CloneString(obj->variant.symLinkVariant.alias); } else { return yaffs_CloneString(_Y("")); } } #ifndef CONFIG_YAFFS_WINCE int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr) { unsigned int valid = attr->ia_valid; if (valid & ATTR_MODE) obj->yst_mode = attr->ia_mode; if (valid & ATTR_UID) obj->yst_uid = attr->ia_uid; if (valid & ATTR_GID) obj->yst_gid = attr->ia_gid; if (valid & ATTR_ATIME) obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime); if (valid & ATTR_CTIME) obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime); if (valid & ATTR_MTIME) obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime); if (valid & ATTR_SIZE) yaffs_ResizeFile(obj, attr->ia_size); yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0); return YAFFS_OK; } int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr) { unsigned int valid = 0; attr->ia_mode = obj->yst_mode; valid |= ATTR_MODE; attr->ia_uid = obj->yst_uid; valid |= ATTR_UID; attr->ia_gid = obj->yst_gid; valid |= ATTR_GID; Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime; valid |= ATTR_ATIME; Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime; valid |= ATTR_CTIME; Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime; valid |= ATTR_MTIME; attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE; attr->ia_valid = valid; return YAFFS_OK; } #endif #if 0 int yaffs_DumpObject(yaffs_Object * obj) { YCHAR name[257]; yaffs_GetObjectName(obj, name, 256); T(YAFFS_TRACE_ALWAYS, (TSTR ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d" " chunk %d type %d size %d\n" TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj))); return YAFFS_OK; } #endif /*---------------------------- Initialisation code -------------------------------------- */ static int yaffs_CheckDevFunctions(const yaffs_Device * dev) { /* Common functions, gotta have */ if (!dev->eraseBlockInNAND || !dev->initialiseNAND) return 0; #ifdef CONFIG_YAFFS_YAFFS2 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */ if (dev->writeChunkWithTagsToNAND && dev->readChunkWithTagsFromNAND && !dev->writeChunkToNAND && !dev->readChunkFromNAND && dev->markNANDBlockBad && dev->queryNANDBlock) return 1; #endif /* Can use the "spare" style interface for yaffs1 */ if (!dev->isYaffs2 && !dev->writeChunkWithTagsToNAND && !dev->readChunkWithTagsFromNAND && dev->writeChunkToNAND && dev->readChunkFromNAND && !dev->markNANDBlockBad && !dev->queryNANDBlock) return 1; return 0; /* bad */ } static int yaffs_CreateInitialDirectories(yaffs_Device *dev) { /* Initialise the unlinked, deleted, root and lost and found directories */ dev->lostNFoundDir = dev->rootDir = NULL; dev->unlinkedDir = dev->deletedDir = NULL; dev->unlinkedDir = yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR); dev->deletedDir = yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR); dev->rootDir = yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT, YAFFS_ROOT_MODE | S_IFDIR); dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND, YAFFS_LOSTNFOUND_MODE | S_IFDIR); if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){ yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir); return YAFFS_OK; } return YAFFS_FAIL; } int yaffs_GutsInitialise(yaffs_Device * dev) { int init_failed = 0; unsigned x; int bits; T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR))); /* Check stuff that must be set */ if (!dev) { T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR))); return YAFFS_FAIL; } dev->internalStartBlock = dev->startBlock; dev->internalEndBlock = dev->endBlock; dev->blockOffset = 0; dev->chunkOffset = 0; dev->nFreeChunks = 0; if (dev->startBlock == 0) { dev->internalStartBlock = dev->startBlock + 1; dev->internalEndBlock = dev->endBlock + 1; dev->blockOffset = 1; dev->chunkOffset = dev->nChunksPerBlock; } /* Check geometry parameters. */ if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) || (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) || dev->nChunksPerBlock < 2 || dev->nReservedBlocks < 2 || dev->internalStartBlock <= 0 || dev->internalEndBlock <= 0 || dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small ) { T(YAFFS_TRACE_ALWAYS, (TSTR ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s " TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : "")); return YAFFS_FAIL; } if (yaffs_InitialiseNAND(dev) != YAFFS_OK) { T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: InitialiseNAND failed" TENDSTR))); return YAFFS_FAIL; } /* Got the right mix of functions? */ if (!yaffs_CheckDevFunctions(dev)) { /* Function missing */ T(YAFFS_TRACE_ALWAYS, (TSTR ("yaffs: device function(s) missing or wrong\n" TENDSTR))); return YAFFS_FAIL; } /* This is really a compilation check. */ if (!yaffs_CheckStructures()) { T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs_CheckStructures failed\n" TENDSTR))); return YAFFS_FAIL; } if (dev->isMounted) { T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: device already mounted\n" TENDSTR))); return YAFFS_FAIL; } /* Finished with most checks. One or two more checks happen later on too. */ dev->isMounted = 1; /* OK now calculate a few things for the device */ /* * Calculate all the chunk size manipulation numbers: */ /* Start off assuming it is a power of 2 */ dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk); dev->chunkMask = (1<chunkShift) - 1; if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){ /* Yes it is a power of 2, disable crumbs */ dev->crumbMask = 0; dev->crumbShift = 0; dev->crumbsPerChunk = 0; } else { /* Not a power of 2, use crumbs instead */ dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart)); dev->crumbMask = (1<crumbShift)-1; dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift); dev->chunkShift = 0; dev->chunkMask = 0; } /* * Calculate chunkGroupBits. * We need to find the next power of 2 > than internalEndBlock */ x = dev->nChunksPerBlock * (dev->internalEndBlock + 1); bits = ShiftsGE(x); /* Set up tnode width if wide tnodes are enabled. */ if(!dev->wideTnodesDisabled){ /* bits must be even so that we end up with 32-bit words */ if(bits & 1) bits++; if(bits < 16) dev->tnodeWidth = 16; else dev->tnodeWidth = bits; } else dev->tnodeWidth = 16; dev->tnodeMask = (1<tnodeWidth)-1; /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled), * so if the bitwidth of the * chunk range we're using is greater than 16 we need * to figure out chunk shift and chunkGroupSize */ if (bits <= dev->tnodeWidth) dev->chunkGroupBits = 0; else dev->chunkGroupBits = bits - dev->tnodeWidth; dev->chunkGroupSize = 1 << dev->chunkGroupBits; if (dev->nChunksPerBlock < dev->chunkGroupSize) { /* We have a problem because the soft delete won't work if * the chunk group size > chunks per block. * This can be remedied by using larger "virtual blocks". */ T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: chunk group too large\n" TENDSTR))); return YAFFS_FAIL; } /* OK, we've finished verifying the device, lets continue with initialisation */ /* More device initialisation */ dev->garbageCollections = 0; dev->passiveGarbageCollections = 0; dev->currentDirtyChecker = 0; dev->bufferedBlock = -1; dev->doingBufferedBlockRewrite = 0; dev->nDeletedFiles = 0; dev->nBackgroundDeletions = 0; dev->nUnlinkedFiles = 0; dev->eccFixed = 0; dev->eccUnfixed = 0; dev->tagsEccFixed = 0; dev->tagsEccUnfixed = 0; dev->nErasureFailures = 0; dev->nErasedBlocks = 0; dev->isDoingGC = 0; dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */ /* Initialise temporary buffers and caches. */ if(!yaffs_InitialiseTempBuffers(dev)) init_failed = 1; dev->srCache = NULL; dev->gcCleanupList = NULL; if (!init_failed && dev->nShortOpCaches > 0) { int i; __u8 *buf; int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache); if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) { dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES; } dev->srCache = YMALLOC(srCacheBytes); buf = (__u8 *)dev->srCache; if(dev->srCache) memset(dev->srCache,0,srCacheBytes); for (i = 0; i < dev->nShortOpCaches && buf; i++) { dev->srCache[i].object = NULL; dev->srCache[i].lastUse = 0; dev->srCache[i].dirty = 0; dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk); } if(!buf) init_failed = 1; dev->srLastUse = 0; } dev->cacheHits = 0; if(!init_failed){ dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32)); if(!dev->gcCleanupList) init_failed = 1; } if (dev->isYaffs2) { dev->useHeaderFileSize = 1; } if(!init_failed && !yaffs_InitialiseBlocks(dev)) init_failed = 1; yaffs_InitialiseTnodes(dev); yaffs_InitialiseObjects(dev); if(!init_failed && !yaffs_CreateInitialDirectories(dev)) init_failed = 1; if(!init_failed){ /* Now scan the flash. */ if (dev->isYaffs2) { if(yaffs_CheckpointRestore(dev)) { T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: restored from checkpoint" TENDSTR))); } else { /* Clean up the mess caused by an aborted checkpoint load * and scan backwards. */ yaffs_DeinitialiseBlocks(dev); yaffs_DeinitialiseTnodes(dev); yaffs_DeinitialiseObjects(dev); dev->nErasedBlocks = 0; dev->nFreeChunks = 0; dev->allocationBlock = -1; dev->allocationPage = -1; dev->nDeletedFiles = 0; dev->nUnlinkedFiles = 0; dev->nBackgroundDeletions = 0; dev->oldestDirtySequence = 0; if(!init_failed && !yaffs_InitialiseBlocks(dev)) init_failed = 1; yaffs_InitialiseTnodes(dev); yaffs_InitialiseObjects(dev); if(!init_failed && !yaffs_CreateInitialDirectories(dev)) init_failed = 1; if(!init_failed && !yaffs_ScanBackwards(dev)) init_failed = 1; } }else if(!yaffs_Scan(dev)) init_failed = 1; } if(init_failed){ /* Clean up the mess */ T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR))); yaffs_Deinitialise(dev); return YAFFS_FAIL; } /* Zero out stats */ dev->nPageReads = 0; dev->nPageWrites = 0; dev->nBlockErasures = 0; dev->nGCCopies = 0; dev->nRetriedWrites = 0; dev->nRetiredBlocks = 0; yaffs_VerifyFreeChunks(dev); yaffs_VerifyBlocks(dev); T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR))); return YAFFS_OK; } void yaffs_Deinitialise(yaffs_Device * dev) { if (dev->isMounted) { int i; yaffs_DeinitialiseBlocks(dev); yaffs_DeinitialiseTnodes(dev); yaffs_DeinitialiseObjects(dev); if (dev->nShortOpCaches > 0 && dev->srCache) { for (i = 0; i < dev->nShortOpCaches; i++) { if(dev->srCache[i].data) YFREE(dev->srCache[i].data); dev->srCache[i].data = NULL; } YFREE(dev->srCache); dev->srCache = NULL; } YFREE(dev->gcCleanupList); for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { YFREE(dev->tempBuffer[i].buffer); } dev->isMounted = 0; } } static int yaffs_CountFreeChunks(yaffs_Device * dev) { int nFree; int b; yaffs_BlockInfo *blk; for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) { blk = yaffs_GetBlockInfo(dev, b); switch (blk->blockState) { case YAFFS_BLOCK_STATE_EMPTY: case YAFFS_BLOCK_STATE_ALLOCATING: case YAFFS_BLOCK_STATE_COLLECTING: case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse + blk->softDeletions); break; default: break; } } return nFree; } int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev) { /* This is what we report to the outside world */ int nFree; int nDirtyCacheChunks; int blocksForCheckpoint; #if 1 nFree = dev->nFreeChunks; #else nFree = yaffs_CountFreeChunks(dev); #endif nFree += dev->nDeletedFiles; /* Now count the number of dirty chunks in the cache and subtract those */ { int i; for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) { if (dev->srCache[i].dirty) nDirtyCacheChunks++; } } nFree -= nDirtyCacheChunks; nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock); /* Now we figure out how much to reserve for the checkpoint and report that... */ blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint; if(blocksForCheckpoint < 0) blocksForCheckpoint = 0; nFree -= (blocksForCheckpoint * dev->nChunksPerBlock); if (nFree < 0) nFree = 0; return nFree; } 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 ----------------------*/ #define yaffs_CheckStruct(structure,syze, name) \ if(sizeof(structure) != syze) \ { \ T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\ name,syze,sizeof(structure))); \ return YAFFS_FAIL; \ } static int yaffs_CheckStructures(void) { /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */ /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */ /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */ #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode") #endif yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader") return YAFFS_OK; }