2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 const char *yaffs_guts_c_version =
15 "$Id: yaffs_guts.c,v 1.56 2008-05-08 23:23:26 charles Exp $";
19 #include "yaffsinterface.h"
20 #include "yaffs_guts.h"
21 #include "yaffs_tagsvalidity.h"
22 #include "yaffs_getblockinfo.h"
24 #include "yaffs_tagscompat.h"
25 #ifndef CONFIG_YAFFS_USE_OWN_SORT
26 #include "yaffs_qsort.h"
28 #include "yaffs_nand.h"
30 #include "yaffs_checkptrw.h"
32 #include "yaffs_nand.h"
33 #include "yaffs_packedtags2.h"
36 #ifdef CONFIG_YAFFS_WINCE
37 void yfsd_LockYAFFS(BOOL fsLockOnly);
38 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
41 #define YAFFS_PASSIVE_GC_CHUNKS 2
43 #include "yaffs_ecc.h"
46 /* Robustification (if it ever comes about...) */
47 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
48 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
49 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
51 const yaffs_ExtendedTags * tags);
52 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
53 const yaffs_ExtendedTags * tags);
55 /* Other local prototypes */
56 static int yaffs_UnlinkObject( yaffs_Object *obj);
57 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
59 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
61 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
63 yaffs_ExtendedTags * tags,
65 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
66 int chunkInNAND, int inScan);
68 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
69 yaffs_ObjectType type);
70 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
72 static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
73 int force, int isShrink, int shadows);
74 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
75 static int yaffs_CheckStructures(void);
76 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
77 int chunkOffset, int *limit);
78 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
80 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
83 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
86 static int yaffs_UnlinkWorker(yaffs_Object * obj);
87 static void yaffs_DestroyObject(yaffs_Object * obj);
89 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
92 loff_t yaffs_GetFileSize(yaffs_Object * obj);
94 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
96 static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
98 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
100 #ifdef YAFFS_PARANOID
101 static int yaffs_CheckFileSanity(yaffs_Object * in);
103 #define yaffs_CheckFileSanity(in)
106 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
107 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
109 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
111 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
112 yaffs_ExtendedTags * tags);
114 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
115 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
116 yaffs_FileStructure * fStruct,
120 /* Function to calculate chunk and offset */
122 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut, __u32 *offsetOut)
127 chunk = (__u32)(addr >> dev->chunkShift);
129 if(dev->chunkDiv == 1)
131 /* easy power of 2 case */
132 offset = (__u32)(addr & dev->chunkMask);
136 /* Non power-of-2 case */
140 chunk /= dev->chunkDiv;
142 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
143 offset = (__u32)(addr - chunkBase);
150 /* Function to return the number of shifts for a power of 2 greater than or equal
151 * to the given number
152 * Note we don't try to cater for all possible numbers and this does not have to
153 * be hellishly efficient.
156 static __u32 ShiftsGE(__u32 x)
161 nShifts = extraBits = 0;
164 if(x & 1) extraBits++;
175 /* Function to return the number of shifts to get a 1 in bit 0
178 static __u32 Shifts(__u32 x)
197 * Temporary buffer manipulations.
200 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
203 __u8 *buf = (__u8 *)1;
205 memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
207 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
208 dev->tempBuffer[i].line = 0; /* not in use */
209 dev->tempBuffer[i].buffer = buf =
210 YMALLOC_DMA(dev->totalBytesPerChunk);
213 return buf ? YAFFS_OK : YAFFS_FAIL;
217 __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
222 if(dev->tempInUse > dev->maxTemp)
223 dev->maxTemp = dev->tempInUse;
225 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
226 if (dev->tempBuffer[i].line == 0) {
227 dev->tempBuffer[i].line = lineNo;
228 if ((i + 1) > dev->maxTemp) {
229 dev->maxTemp = i + 1;
230 for (j = 0; j <= i; j++)
231 dev->tempBuffer[j].maxLine =
232 dev->tempBuffer[j].line;
235 return dev->tempBuffer[i].buffer;
239 T(YAFFS_TRACE_BUFFERS,
240 (TSTR("Out of temp buffers at line %d, other held by lines:"),
242 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
243 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
245 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
248 * If we got here then we have to allocate an unmanaged one
252 dev->unmanagedTempAllocations++;
253 return YMALLOC(dev->nDataBytesPerChunk);
257 void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
264 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
265 if (dev->tempBuffer[i].buffer == buffer) {
266 dev->tempBuffer[i].line = 0;
272 /* assume it is an unmanaged one. */
273 T(YAFFS_TRACE_BUFFERS,
274 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
277 dev->unmanagedTempDeallocations++;
283 * Determine if we have a managed buffer.
285 int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
288 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
289 if (dev->tempBuffer[i].buffer == buffer)
294 for (i = 0; i < dev->nShortOpCaches; i++) {
295 if( dev->srCache[i].data == buffer )
300 if (buffer == dev->checkpointBuffer)
303 T(YAFFS_TRACE_ALWAYS,
304 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
311 * Chunk bitmap manipulations
314 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
316 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
318 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
322 return dev->chunkBits +
323 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
326 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
328 if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
329 chunk < 0 || chunk >= dev->nChunksPerBlock) {
331 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
336 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
338 __u8 *blkBits = yaffs_BlockBits(dev, blk);
340 memset(blkBits, 0, dev->chunkBitmapStride);
343 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
345 __u8 *blkBits = yaffs_BlockBits(dev, blk);
347 yaffs_VerifyChunkBitId(dev,blk,chunk);
349 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
352 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
354 __u8 *blkBits = yaffs_BlockBits(dev, blk);
356 yaffs_VerifyChunkBitId(dev,blk,chunk);
358 blkBits[chunk / 8] |= (1 << (chunk & 7));
361 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
363 __u8 *blkBits = yaffs_BlockBits(dev, blk);
364 yaffs_VerifyChunkBitId(dev,blk,chunk);
366 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
369 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
371 __u8 *blkBits = yaffs_BlockBits(dev, blk);
373 for (i = 0; i < dev->chunkBitmapStride; i++) {
381 static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
383 __u8 *blkBits = yaffs_BlockBits(dev, blk);
386 for (i = 0; i < dev->chunkBitmapStride; i++) {
403 static int yaffs_SkipVerification(yaffs_Device *dev)
405 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
409 static int yaffs_SkipFullVerification(yaffs_Device *dev)
411 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
416 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
418 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
421 static const char * blockStateName[] = {
434 static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
439 if(yaffs_SkipVerification(dev))
442 /* Report illegal runtime states */
443 if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
444 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
446 switch(bi->blockState){
447 case YAFFS_BLOCK_STATE_UNKNOWN:
448 case YAFFS_BLOCK_STATE_SCANNING:
449 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
450 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
451 n,blockStateName[bi->blockState]));
454 /* Check pages in use and soft deletions are legal */
456 actuallyUsed = bi->pagesInUse - bi->softDeletions;
458 if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
459 bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
460 actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
461 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
462 n,bi->pagesInUse,bi->softDeletions));
465 /* Check chunk bitmap legal */
466 inUse = yaffs_CountChunkBits(dev,n);
467 if(inUse != bi->pagesInUse)
468 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
469 n,bi->pagesInUse,inUse));
471 /* Check that the sequence number is valid.
472 * Ten million is legal, but is very unlikely
475 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
476 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
477 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
478 n,bi->sequenceNumber));
482 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
484 yaffs_VerifyBlock(dev,bi,n);
486 /* After collection the block should be in the erased state */
487 /* TODO: This will need to change if we do partial gc */
489 if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
490 T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
495 static void yaffs_VerifyBlocks(yaffs_Device *dev)
498 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
499 int nIllegalBlockStates = 0;
502 if(yaffs_SkipVerification(dev))
505 memset(nBlocksPerState,0,sizeof(nBlocksPerState));
508 for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
509 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
510 yaffs_VerifyBlock(dev,bi,i);
512 if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
513 nBlocksPerState[bi->blockState]++;
515 nIllegalBlockStates++;
519 T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
520 T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
522 T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
523 if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
524 T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
526 for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
527 T(YAFFS_TRACE_VERIFY,
528 (TSTR("%s %d blocks"TENDSTR),
529 blockStateName[i],nBlocksPerState[i]));
531 if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
532 T(YAFFS_TRACE_VERIFY,
533 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
534 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
536 if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
537 T(YAFFS_TRACE_VERIFY,
538 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
539 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
541 if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
542 T(YAFFS_TRACE_VERIFY,
543 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
544 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
546 T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
551 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
552 * case those tests will not be performed.
554 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
556 if(yaffs_SkipVerification(obj->myDev))
559 if(!(tags && obj && oh)){
560 T(YAFFS_TRACE_VERIFY,
561 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
562 (__u32)tags,(__u32)obj,(__u32)oh));
566 if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
567 oh->type > YAFFS_OBJECT_TYPE_MAX)
568 T(YAFFS_TRACE_VERIFY,
569 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
570 tags->objectId, oh->type));
572 if(tags->objectId != obj->objectId)
573 T(YAFFS_TRACE_VERIFY,
574 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
575 tags->objectId, obj->objectId));
579 * Check that the object's parent ids match if parentCheck requested.
581 * Tests do not apply to the root object.
584 if(parentCheck && tags->objectId > 1 && !obj->parent)
585 T(YAFFS_TRACE_VERIFY,
586 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
587 tags->objectId, oh->parentObjectId));
590 if(parentCheck && obj->parent &&
591 oh->parentObjectId != obj->parent->objectId &&
592 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
593 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
594 T(YAFFS_TRACE_VERIFY,
595 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
596 tags->objectId, oh->parentObjectId, obj->parent->objectId));
599 if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
600 T(YAFFS_TRACE_VERIFY,
601 (TSTR("Obj %d header name is NULL"TENDSTR),
604 if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
605 T(YAFFS_TRACE_VERIFY,
606 (TSTR("Obj %d header name is 0xFF"TENDSTR),
612 static int yaffs_VerifyTnodeWorker(yaffs_Object * obj, yaffs_Tnode * tn,
613 __u32 level, int chunkOffset)
616 yaffs_Device *dev = obj->myDev;
622 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
623 if (tn->internal[i]) {
624 ok = yaffs_VerifyTnodeWorker(obj,
627 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
630 } else if (level == 0) {
632 yaffs_ExtendedTags tags;
633 __u32 objectId = obj->objectId;
635 chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
637 for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){
638 __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
641 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
642 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
643 if(tags.objectId != objectId || tags.chunkId != chunkOffset){
644 T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
645 objectId, chunkOffset, theChunk,
646 tags.objectId, tags.chunkId));
659 static void yaffs_VerifyFile(yaffs_Object *obj)
661 int requiredTallness;
667 yaffs_ExtendedTags tags;
671 if(obj && yaffs_SkipVerification(obj->myDev))
675 objectId = obj->objectId;
677 /* Check file size is consistent with tnode depth */
678 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
679 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
680 requiredTallness = 0;
682 x >>= YAFFS_TNODES_INTERNAL_BITS;
686 actualTallness = obj->variant.fileVariant.topLevel;
688 if(requiredTallness > actualTallness )
689 T(YAFFS_TRACE_VERIFY,
690 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
691 obj->objectId,actualTallness, requiredTallness));
694 /* Check that the chunks in the tnode tree are all correct.
695 * We do this by scanning through the tnode tree and
696 * checking the tags for every chunk match.
699 if(yaffs_SkipNANDVerification(dev))
702 for(i = 1; i <= lastChunk; i++){
703 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
706 __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
708 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
709 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
710 if(tags.objectId != objectId || tags.chunkId != i){
711 T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
712 objectId, i, theChunk,
713 tags.objectId, tags.chunkId));
722 static void yaffs_VerifyDirectory(yaffs_Object *obj)
724 if(obj && yaffs_SkipVerification(obj->myDev))
729 static void yaffs_VerifyHardLink(yaffs_Object *obj)
731 if(obj && yaffs_SkipVerification(obj->myDev))
734 /* Verify sane equivalent object */
737 static void yaffs_VerifySymlink(yaffs_Object *obj)
739 if(obj && yaffs_SkipVerification(obj->myDev))
742 /* Verify symlink string */
745 static void yaffs_VerifySpecial(yaffs_Object *obj)
747 if(obj && yaffs_SkipVerification(obj->myDev))
751 static void yaffs_VerifyObject(yaffs_Object *obj)
766 if(yaffs_SkipVerification(dev))
769 /* Check sane object header chunk */
771 chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
772 chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
774 chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
775 chunkIsLive = chunkIdOk &&
776 yaffs_CheckChunkBit(dev,
777 obj->chunkId / dev->nChunksPerBlock,
778 obj->chunkId % dev->nChunksPerBlock);
780 (!chunkIdOk || !chunkIsLive)) {
781 T(YAFFS_TRACE_VERIFY,
782 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
783 obj->objectId,obj->chunkId,
784 chunkIdOk ? "" : ",out of range",
785 chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
788 if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
789 yaffs_ExtendedTags tags;
790 yaffs_ObjectHeader *oh;
791 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
793 oh = (yaffs_ObjectHeader *)buffer;
795 yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
797 yaffs_VerifyObjectHeader(obj,oh,&tags,1);
799 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
802 /* Verify it has a parent */
803 if(obj && !obj->fake &&
804 (!obj->parent || obj->parent->myDev != dev)){
805 T(YAFFS_TRACE_VERIFY,
806 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
807 obj->objectId,obj->parent));
810 /* Verify parent is a directory */
811 if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
812 T(YAFFS_TRACE_VERIFY,
813 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
814 obj->objectId,obj->parent->variantType));
817 switch(obj->variantType){
818 case YAFFS_OBJECT_TYPE_FILE:
819 yaffs_VerifyFile(obj);
821 case YAFFS_OBJECT_TYPE_SYMLINK:
822 yaffs_VerifySymlink(obj);
824 case YAFFS_OBJECT_TYPE_DIRECTORY:
825 yaffs_VerifyDirectory(obj);
827 case YAFFS_OBJECT_TYPE_HARDLINK:
828 yaffs_VerifyHardLink(obj);
830 case YAFFS_OBJECT_TYPE_SPECIAL:
831 yaffs_VerifySpecial(obj);
833 case YAFFS_OBJECT_TYPE_UNKNOWN:
835 T(YAFFS_TRACE_VERIFY,
836 (TSTR("Obj %d has illegaltype %d"TENDSTR),
837 obj->objectId,obj->variantType));
844 static void yaffs_VerifyObjects(yaffs_Device *dev)
848 struct ylist_head *lh;
850 if(yaffs_SkipVerification(dev))
853 /* Iterate through the objects in each hash entry */
855 for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++){
856 ylist_for_each(lh, &dev->objectBucket[i].list) {
858 obj = ylist_entry(lh, yaffs_Object, hashLink);
859 yaffs_VerifyObject(obj);
868 * Simple hash function. Needs to have a reasonable spread
871 static Y_INLINE int yaffs_HashFunction(int n)
874 return (n % YAFFS_NOBJECT_BUCKETS);
878 * Access functions to useful fake objects
881 yaffs_Object *yaffs_Root(yaffs_Device * dev)
886 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
888 return dev->lostNFoundDir;
893 * Erased NAND checking functions
896 int yaffs_CheckFF(__u8 * buffer, int nBytes)
898 /* Horrible, slow implementation */
907 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
911 int retval = YAFFS_OK;
912 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
913 yaffs_ExtendedTags tags;
916 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
918 if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
922 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
923 T(YAFFS_TRACE_NANDACCESS,
924 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
928 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
934 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
936 yaffs_ExtendedTags * tags,
943 yaffs_InvalidateCheckpoint(dev);
946 yaffs_BlockInfo *bi = 0;
949 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
955 /* First check this chunk is erased, if it needs
956 * checking. The checking policy (unless forced
957 * always on) is as follows:
959 * Check the first page we try to write in a block.
960 * If the check passes then we don't need to check any
961 * more. If the check fails, we check again...
962 * If the block has been erased, we don't need to check.
964 * However, if the block has been prioritised for gc,
965 * then we think there might be something odd about
966 * this block and stop using it.
968 * Rationale: We should only ever see chunks that have
969 * not been erased if there was a partially written
970 * chunk due to power loss. This checking policy should
971 * catch that case with very few checks and thus save a
972 * lot of checks that are most likely not needed.
974 if (bi->gcPrioritise) {
975 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
976 /* try another chunk */
980 /* let's give it a try */
983 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
984 bi->skipErasedCheck = 0;
986 if (!bi->skipErasedCheck) {
987 erasedOk = yaffs_CheckChunkErased(dev, chunk);
988 if (erasedOk != YAFFS_OK) {
990 (TSTR ("**>> yaffs chunk %d was not erased"
993 /* try another chunk */
996 bi->skipErasedCheck = 1;
999 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
1001 if (writeOk != YAFFS_OK) {
1002 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
1003 /* try another chunk */
1007 /* Copy the data into the robustification buffer */
1008 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
1010 } while (writeOk != YAFFS_OK &&
1011 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1017 T(YAFFS_TRACE_ERROR,
1018 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1021 dev->nRetriedWrites += (attempts - 1);
1028 * Block retiring for handling a broken block.
1031 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
1033 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1035 yaffs_InvalidateCheckpoint(dev);
1037 yaffs_MarkBlockBad(dev, blockInNAND);
1039 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1040 bi->gcPrioritise = 0;
1041 bi->needsRetiring = 0;
1043 dev->nRetiredBlocks++;
1047 * Functions for robustisizing TODO
1051 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
1053 const yaffs_ExtendedTags * tags)
1057 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
1058 const yaffs_ExtendedTags * tags)
1062 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1064 if(!bi->gcPrioritise){
1065 bi->gcPrioritise = 1;
1066 dev->hasPendingPrioritisedGCs = 1;
1067 bi->chunkErrorStrikes ++;
1069 if(bi->chunkErrorStrikes > 3){
1070 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1071 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1078 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
1081 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1082 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1084 yaffs_HandleChunkError(dev,bi);
1088 /* Was an actual write failure, so mark the block for retirement */
1089 bi->needsRetiring = 1;
1090 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1091 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1096 /* Delete the chunk */
1097 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1101 /*---------------- Name handling functions ------------*/
1103 static __u16 yaffs_CalcNameSum(const YCHAR * name)
1108 YUCHAR *bname = (YUCHAR *) name;
1110 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1112 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1113 sum += yaffs_toupper(*bname) * i;
1115 sum += (*bname) * i;
1124 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
1126 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1127 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
1128 yaffs_strcpy(obj->shortName, name);
1130 obj->shortName[0] = _Y('\0');
1133 obj->sum = yaffs_CalcNameSum(name);
1136 /*-------------------- TNODES -------------------
1138 * List of spare tnodes
1139 * The list is hooked together using the first pointer
1143 /* yaffs_CreateTnodes creates a bunch more tnodes and
1144 * adds them to the tnode free list.
1145 * Don't use this function directly
1148 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
1152 yaffs_Tnode *newTnodes;
1156 yaffs_TnodeList *tnl;
1161 /* Calculate the tnode size in bytes for variable width tnode support.
1162 * Must be a multiple of 32-bits */
1163 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1165 if(tnodeSize < sizeof(yaffs_Tnode))
1166 tnodeSize = sizeof(yaffs_Tnode);
1169 /* make these things */
1171 newTnodes = YMALLOC(nTnodes * tnodeSize);
1172 mem = (__u8 *)newTnodes;
1175 T(YAFFS_TRACE_ERROR,
1176 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1180 /* Hook them into the free list */
1182 for (i = 0; i < nTnodes - 1; i++) {
1183 newTnodes[i].internal[0] = &newTnodes[i + 1];
1184 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1185 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1189 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1190 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1191 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1193 dev->freeTnodes = newTnodes;
1195 /* New hookup for wide tnodes */
1196 for(i = 0; i < nTnodes -1; i++) {
1197 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1198 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1199 curr->internal[0] = next;
1202 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1203 curr->internal[0] = dev->freeTnodes;
1204 dev->freeTnodes = (yaffs_Tnode *)mem;
1209 dev->nFreeTnodes += nTnodes;
1210 dev->nTnodesCreated += nTnodes;
1212 /* Now add this bunch of tnodes to a list for freeing up.
1213 * NB If we can't add this to the management list it isn't fatal
1214 * but it just means we can't free this bunch of tnodes later.
1217 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1219 T(YAFFS_TRACE_ERROR,
1221 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1225 tnl->tnodes = newTnodes;
1226 tnl->next = dev->allocatedTnodeList;
1227 dev->allocatedTnodeList = tnl;
1230 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1235 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1237 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
1239 yaffs_Tnode *tn = NULL;
1241 /* If there are none left make more */
1242 if (!dev->freeTnodes) {
1243 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1246 if (dev->freeTnodes) {
1247 tn = dev->freeTnodes;
1248 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1249 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1250 /* Hoosterman, this thing looks like it isn't in the list */
1251 T(YAFFS_TRACE_ALWAYS,
1252 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1255 dev->freeTnodes = dev->freeTnodes->internal[0];
1259 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1264 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
1266 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1267 int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1269 if(tnodeSize < sizeof(yaffs_Tnode))
1270 tnodeSize = sizeof(yaffs_Tnode);
1273 memset(tn, 0, tnodeSize);
1278 /* FreeTnode frees up a tnode and puts it back on the free list */
1279 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
1282 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1283 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1284 /* Hoosterman, this thing looks like it is already in the list */
1285 T(YAFFS_TRACE_ALWAYS,
1286 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1288 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1290 tn->internal[0] = dev->freeTnodes;
1291 dev->freeTnodes = tn;
1294 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1298 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
1300 /* Free the list of allocated tnodes */
1301 yaffs_TnodeList *tmp;
1303 while (dev->allocatedTnodeList) {
1304 tmp = dev->allocatedTnodeList->next;
1306 YFREE(dev->allocatedTnodeList->tnodes);
1307 YFREE(dev->allocatedTnodeList);
1308 dev->allocatedTnodeList = tmp;
1312 dev->freeTnodes = NULL;
1313 dev->nFreeTnodes = 0;
1316 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
1318 dev->allocatedTnodeList = NULL;
1319 dev->freeTnodes = NULL;
1320 dev->nFreeTnodes = 0;
1321 dev->nTnodesCreated = 0;
1326 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
1328 __u32 *map = (__u32 *)tn;
1334 pos &= YAFFS_TNODES_LEVEL0_MASK;
1335 val >>= dev->chunkGroupBits;
1337 bitInMap = pos * dev->tnodeWidth;
1338 wordInMap = bitInMap /32;
1339 bitInWord = bitInMap & (32 -1);
1341 mask = dev->tnodeMask << bitInWord;
1343 map[wordInMap] &= ~mask;
1344 map[wordInMap] |= (mask & (val << bitInWord));
1346 if(dev->tnodeWidth > (32-bitInWord)) {
1347 bitInWord = (32 - bitInWord);
1349 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1350 map[wordInMap] &= ~mask;
1351 map[wordInMap] |= (mask & (val >> bitInWord));
1355 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
1357 __u32 *map = (__u32 *)tn;
1363 pos &= YAFFS_TNODES_LEVEL0_MASK;
1365 bitInMap = pos * dev->tnodeWidth;
1366 wordInMap = bitInMap /32;
1367 bitInWord = bitInMap & (32 -1);
1369 val = map[wordInMap] >> bitInWord;
1371 if(dev->tnodeWidth > (32-bitInWord)) {
1372 bitInWord = (32 - bitInWord);
1374 val |= (map[wordInMap] << bitInWord);
1377 val &= dev->tnodeMask;
1378 val <<= dev->chunkGroupBits;
1383 /* ------------------- End of individual tnode manipulation -----------------*/
1385 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1386 * The look up tree is represented by the top tnode and the number of topLevel
1387 * in the tree. 0 means only the level 0 tnode is in the tree.
1390 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1391 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
1392 yaffs_FileStructure * fStruct,
1396 yaffs_Tnode *tn = fStruct->top;
1398 int requiredTallness;
1399 int level = fStruct->topLevel;
1401 /* Check sane level and chunk Id */
1402 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
1406 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1410 /* First check we're tall enough (ie enough topLevel) */
1412 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1413 requiredTallness = 0;
1415 i >>= YAFFS_TNODES_INTERNAL_BITS;
1419 if (requiredTallness > fStruct->topLevel) {
1420 /* Not tall enough, so we can't find it, return NULL. */
1424 /* Traverse down to level 0 */
1425 while (level > 0 && tn) {
1427 internal[(chunkId >>
1428 ( YAFFS_TNODES_LEVEL0_BITS +
1430 YAFFS_TNODES_INTERNAL_BITS)
1432 YAFFS_TNODES_INTERNAL_MASK];
1440 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1441 * This happens in two steps:
1442 * 1. If the tree isn't tall enough, then make it taller.
1443 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1445 * Used when modifying the tree.
1447 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1448 * be plugged into the ttree.
1451 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
1452 yaffs_FileStructure * fStruct,
1454 yaffs_Tnode *passedTn)
1457 int requiredTallness;
1465 /* Check sane level and page Id */
1466 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
1470 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1474 /* First check we're tall enough (ie enough topLevel) */
1476 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1477 requiredTallness = 0;
1479 x >>= YAFFS_TNODES_INTERNAL_BITS;
1484 if (requiredTallness > fStruct->topLevel) {
1485 /* Not tall enough,gotta make the tree taller */
1486 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1488 tn = yaffs_GetTnode(dev);
1491 tn->internal[0] = fStruct->top;
1494 T(YAFFS_TRACE_ERROR,
1495 (TSTR("yaffs: no more tnodes" TENDSTR)));
1499 fStruct->topLevel = requiredTallness;
1502 /* Traverse down to level 0, adding anything we need */
1504 l = fStruct->topLevel;
1508 while (l > 0 && tn) {
1510 ( YAFFS_TNODES_LEVEL0_BITS +
1511 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1512 YAFFS_TNODES_INTERNAL_MASK;
1515 if((l>1) && !tn->internal[x]){
1516 /* Add missing non-level-zero tnode */
1517 tn->internal[x] = yaffs_GetTnode(dev);
1520 /* Looking from level 1 at level 0 */
1522 /* If we already have one, then release it.*/
1524 yaffs_FreeTnode(dev,tn->internal[x]);
1525 tn->internal[x] = passedTn;
1527 } else if(!tn->internal[x]) {
1528 /* Don't have one, none passed in */
1529 tn->internal[x] = yaffs_GetTnode(dev);
1533 tn = tn->internal[x];
1537 /* top is level 0 */
1539 memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1540 yaffs_FreeTnode(dev,passedTn);
1547 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
1548 yaffs_ExtendedTags * tags, int objectId,
1553 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1554 if (yaffs_CheckChunkBit
1555 (dev, theChunk / dev->nChunksPerBlock,
1556 theChunk % dev->nChunksPerBlock)) {
1557 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1559 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1571 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1572 * chunks and tnodes in the file
1573 * Returns 1 if the tree was deleted.
1574 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1577 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
1578 int chunkOffset, int *limit)
1583 yaffs_ExtendedTags tags;
1585 yaffs_Device *dev = in->myDev;
1592 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1594 if (tn->internal[i]) {
1595 if (limit && (*limit) < 0) {
1599 yaffs_DeleteWorker(in,
1607 YAFFS_TNODES_INTERNAL_BITS)
1612 yaffs_FreeTnode(dev,
1615 tn->internal[i] = NULL;
1620 return (allDone) ? 1 : 0;
1621 } else if (level == 0) {
1624 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1626 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1631 YAFFS_TNODES_LEVEL0_BITS) + i;
1634 yaffs_FindChunkInGroup(dev,
1640 if (foundChunk > 0) {
1641 yaffs_DeleteChunk(dev,
1646 *limit = *limit - 1;
1654 yaffs_PutLevel0Tnode(dev,tn,i,0);
1658 return (i < 0) ? 1 : 0;
1668 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1671 yaffs_BlockInfo *theBlock;
1673 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1675 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1677 theBlock->softDeletions++;
1682 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1683 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1685 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1688 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1689 __u32 level, int chunkOffset)
1694 yaffs_Device *dev = in->myDev;
1699 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1701 if (tn->internal[i]) {
1703 yaffs_SoftDeleteWorker(in,
1709 YAFFS_TNODES_INTERNAL_BITS)
1712 yaffs_FreeTnode(dev,
1715 tn->internal[i] = NULL;
1717 /* Hoosterman... how could this happen? */
1721 return (allDone) ? 1 : 0;
1722 } else if (level == 0) {
1724 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1725 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1727 /* Note this does not find the real chunk, only the chunk group.
1728 * We make an assumption that a chunk group is not larger than
1731 yaffs_SoftDeleteChunk(dev, theChunk);
1732 yaffs_PutLevel0Tnode(dev,tn,i,0);
1746 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1749 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1750 if (obj->nDataChunks <= 0) {
1751 /* Empty file with no duplicate object headers, just delete it immediately */
1752 yaffs_FreeTnode(obj->myDev,
1753 obj->variant.fileVariant.top);
1754 obj->variant.fileVariant.top = NULL;
1755 T(YAFFS_TRACE_TRACING,
1756 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1758 yaffs_DoGenericObjectDeletion(obj);
1760 yaffs_SoftDeleteWorker(obj,
1761 obj->variant.fileVariant.top,
1762 obj->variant.fileVariant.
1764 obj->softDeleted = 1;
1769 /* Pruning removes any part of the file structure tree that is beyond the
1770 * bounds of the file (ie that does not point to chunks).
1772 * A file should only get pruned when its size is reduced.
1774 * Before pruning, the chunks must be pulled from the tree and the
1775 * level 0 tnode entries must be zeroed out.
1776 * Could also use this for file deletion, but that's probably better handled
1777 * by a special case.
1780 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1781 __u32 level, int del0)
1789 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1790 if (tn->internal[i] && level > 0) {
1792 yaffs_PruneWorker(dev, tn->internal[i],
1794 (i == 0) ? del0 : 1);
1797 if (tn->internal[i]) {
1802 if (hasData == 0 && del0) {
1803 /* Free and return NULL */
1805 yaffs_FreeTnode(dev, tn);
1815 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1816 yaffs_FileStructure * fStruct)
1823 if (fStruct->topLevel > 0) {
1825 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1827 /* Now we have a tree with all the non-zero branches NULL but the height
1828 * is the same as it was.
1829 * Let's see if we can trim internal tnodes to shorten the tree.
1830 * We can do this if only the 0th element in the tnode is in use
1831 * (ie all the non-zero are NULL)
1834 while (fStruct->topLevel && !done) {
1838 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1839 if (tn->internal[i]) {
1845 fStruct->top = tn->internal[0];
1846 fStruct->topLevel--;
1847 yaffs_FreeTnode(dev, tn);
1857 /*-------------------- End of File Structure functions.-------------------*/
1859 /* yaffs_CreateFreeObjects creates a bunch more objects and
1860 * adds them to the object free list.
1862 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1865 yaffs_Object *newObjects;
1866 yaffs_ObjectList *list;
1871 /* make these things */
1872 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1873 list = YMALLOC(sizeof(yaffs_ObjectList));
1875 if (!newObjects || !list) {
1880 T(YAFFS_TRACE_ALLOCATE,
1881 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1885 /* Hook them into the free list */
1886 for (i = 0; i < nObjects - 1; i++) {
1887 newObjects[i].siblings.next =
1888 (struct ylist_head *)(&newObjects[i + 1]);
1891 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1892 dev->freeObjects = newObjects;
1893 dev->nFreeObjects += nObjects;
1894 dev->nObjectsCreated += nObjects;
1896 /* Now add this bunch of Objects to a list for freeing up. */
1898 list->objects = newObjects;
1899 list->next = dev->allocatedObjectList;
1900 dev->allocatedObjectList = list;
1906 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1907 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1909 yaffs_Object *tn = NULL;
1911 /* If there are none left make more */
1912 if (!dev->freeObjects) {
1913 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1916 if (dev->freeObjects) {
1917 tn = dev->freeObjects;
1919 (yaffs_Object *) (dev->freeObjects->siblings.next);
1920 dev->nFreeObjects--;
1922 /* Now sweeten it up... */
1924 memset(tn, 0, sizeof(yaffs_Object));
1927 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1928 YINIT_LIST_HEAD(&(tn->hardLinks));
1929 YINIT_LIST_HEAD(&(tn->hashLink));
1930 YINIT_LIST_HEAD(&tn->siblings);
1932 /* Add it to the lost and found directory.
1933 * NB Can't put root or lostNFound in lostNFound so
1934 * check if lostNFound exists first
1936 if (dev->lostNFoundDir) {
1937 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1941 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1946 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1951 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1953 obj->fake = 1; /* it is fake so it has no NAND presence... */
1954 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1955 obj->unlinkAllowed = 0; /* ... or unlink it */
1958 obj->yst_mode = mode;
1960 obj->chunkId = 0; /* Not a valid chunk. */
1967 static void yaffs_UnhashObject(yaffs_Object * tn)
1970 yaffs_Device *dev = tn->myDev;
1972 /* If it is still linked into the bucket list, free from the list */
1973 if (!ylist_empty(&tn->hashLink)) {
1974 ylist_del_init(&tn->hashLink);
1975 bucket = yaffs_HashFunction(tn->objectId);
1976 dev->objectBucket[bucket].count--;
1981 /* FreeObject frees up a Object and puts it back on the free list */
1982 static void yaffs_FreeObject(yaffs_Object * tn)
1985 yaffs_Device *dev = tn->myDev;
1989 /* We're still hooked up to a cached inode.
1990 * Don't delete now, but mark for later deletion
1992 tn->deferedFree = 1;
1997 yaffs_UnhashObject(tn);
1999 /* Link into the free list. */
2000 tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2001 dev->freeObjects = tn;
2002 dev->nFreeObjects++;
2004 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2010 void yaffs_HandleDeferedFree(yaffs_Object * obj)
2012 if (obj->deferedFree) {
2013 yaffs_FreeObject(obj);
2019 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
2021 /* Free the list of allocated Objects */
2023 yaffs_ObjectList *tmp;
2025 while (dev->allocatedObjectList) {
2026 tmp = dev->allocatedObjectList->next;
2027 YFREE(dev->allocatedObjectList->objects);
2028 YFREE(dev->allocatedObjectList);
2030 dev->allocatedObjectList = tmp;
2033 dev->freeObjects = NULL;
2034 dev->nFreeObjects = 0;
2037 static void yaffs_InitialiseObjects(yaffs_Device * dev)
2041 dev->allocatedObjectList = NULL;
2042 dev->freeObjects = NULL;
2043 dev->nFreeObjects = 0;
2045 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2046 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2047 dev->objectBucket[i].count = 0;
2052 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
2057 int lowest = 999999;
2059 /* First let's see if we can find one that's empty. */
2061 for (i = 0; i < 10 && lowest > 0; i++) {
2063 x %= YAFFS_NOBJECT_BUCKETS;
2064 if (dev->objectBucket[x].count < lowest) {
2065 lowest = dev->objectBucket[x].count;
2071 /* If we didn't find an empty list, then try
2072 * looking a bit further for a short one
2075 for (i = 0; i < 10 && lowest > 3; i++) {
2077 x %= YAFFS_NOBJECT_BUCKETS;
2078 if (dev->objectBucket[x].count < lowest) {
2079 lowest = dev->objectBucket[x].count;
2088 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
2090 int bucket = yaffs_FindNiceObjectBucket(dev);
2092 /* Now find an object value that has not already been taken
2093 * by scanning the list.
2097 struct ylist_head *i;
2099 __u32 n = (__u32) bucket;
2101 /* yaffs_CheckObjectHashSanity(); */
2105 n += YAFFS_NOBJECT_BUCKETS;
2106 if (1 || dev->objectBucket[bucket].count > 0) {
2107 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2108 /* If there is already one in the list */
2110 && ylist_entry(i, yaffs_Object,
2111 hashLink)->objectId == n) {
2122 static void yaffs_HashObject(yaffs_Object * in)
2124 int bucket = yaffs_HashFunction(in->objectId);
2125 yaffs_Device *dev = in->myDev;
2127 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2128 dev->objectBucket[bucket].count++;
2132 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
2134 int bucket = yaffs_HashFunction(number);
2135 struct ylist_head *i;
2138 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2139 /* Look if it is in the list */
2141 in = ylist_entry(i, yaffs_Object, hashLink);
2142 if (in->objectId == number) {
2144 /* Don't tell the VFS about this one if it is defered free */
2145 if (in->deferedFree)
2157 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
2158 yaffs_ObjectType type)
2161 yaffs_Object *theObject;
2162 yaffs_Tnode *tn = NULL;
2165 number = yaffs_CreateNewObjectNumber(dev);
2168 theObject = yaffs_AllocateEmptyObject(dev);
2172 if(type == YAFFS_OBJECT_TYPE_FILE){
2173 tn = yaffs_GetTnode(dev);
2175 yaffs_FreeObject(theObject);
2183 theObject->fake = 0;
2184 theObject->renameAllowed = 1;
2185 theObject->unlinkAllowed = 1;
2186 theObject->objectId = number;
2187 yaffs_HashObject(theObject);
2188 theObject->variantType = type;
2189 #ifdef CONFIG_YAFFS_WINCE
2190 yfsd_WinFileTimeNow(theObject->win_atime);
2191 theObject->win_ctime[0] = theObject->win_mtime[0] =
2192 theObject->win_atime[0];
2193 theObject->win_ctime[1] = theObject->win_mtime[1] =
2194 theObject->win_atime[1];
2198 theObject->yst_atime = theObject->yst_mtime =
2199 theObject->yst_ctime = Y_CURRENT_TIME;
2202 case YAFFS_OBJECT_TYPE_FILE:
2203 theObject->variant.fileVariant.fileSize = 0;
2204 theObject->variant.fileVariant.scannedFileSize = 0;
2205 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2206 theObject->variant.fileVariant.topLevel = 0;
2207 theObject->variant.fileVariant.top = tn;
2209 case YAFFS_OBJECT_TYPE_DIRECTORY:
2210 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2213 case YAFFS_OBJECT_TYPE_SYMLINK:
2214 case YAFFS_OBJECT_TYPE_HARDLINK:
2215 case YAFFS_OBJECT_TYPE_SPECIAL:
2216 /* No action required */
2218 case YAFFS_OBJECT_TYPE_UNKNOWN:
2219 /* todo this should not happen */
2227 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
2229 yaffs_ObjectType type)
2231 yaffs_Object *theObject = NULL;
2234 theObject = yaffs_FindObjectByNumber(dev, number);
2238 theObject = yaffs_CreateNewObject(dev, number, type);
2246 static YCHAR *yaffs_CloneString(const YCHAR * str)
2248 YCHAR *newStr = NULL;
2251 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2253 yaffs_strcpy(newStr, str);
2261 * Mknod (create) a new object.
2262 * equivalentObject only has meaning for a hard link;
2263 * aliasString only has meaning for a sumlink.
2264 * rdev only has meaning for devices (a subset of special objects)
2267 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2268 yaffs_Object * parent,
2273 yaffs_Object * equivalentObject,
2274 const YCHAR * aliasString, __u32 rdev)
2279 yaffs_Device *dev = parent->myDev;
2281 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2282 if (yaffs_FindObjectByName(parent, name)) {
2286 in = yaffs_CreateNewObject(dev, -1, type);
2288 if(type == YAFFS_OBJECT_TYPE_SYMLINK){
2289 str = yaffs_CloneString(aliasString);
2291 yaffs_FreeObject(in);
2301 in->variantType = type;
2303 in->yst_mode = mode;
2305 #ifdef CONFIG_YAFFS_WINCE
2306 yfsd_WinFileTimeNow(in->win_atime);
2307 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2308 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2311 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2313 in->yst_rdev = rdev;
2317 in->nDataChunks = 0;
2319 yaffs_SetObjectName(in, name);
2322 yaffs_AddObjectToDirectory(parent, in);
2324 in->myDev = parent->myDev;
2327 case YAFFS_OBJECT_TYPE_SYMLINK:
2328 in->variant.symLinkVariant.alias = str;
2330 case YAFFS_OBJECT_TYPE_HARDLINK:
2331 in->variant.hardLinkVariant.equivalentObject =
2333 in->variant.hardLinkVariant.equivalentObjectId =
2334 equivalentObject->objectId;
2335 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2337 case YAFFS_OBJECT_TYPE_FILE:
2338 case YAFFS_OBJECT_TYPE_DIRECTORY:
2339 case YAFFS_OBJECT_TYPE_SPECIAL:
2340 case YAFFS_OBJECT_TYPE_UNKNOWN:
2345 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2346 /* Could not create the object header, fail the creation */
2347 yaffs_DestroyObject(in);
2356 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
2357 __u32 mode, __u32 uid, __u32 gid)
2359 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2360 uid, gid, NULL, NULL, 0);
2363 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
2364 __u32 mode, __u32 uid, __u32 gid)
2366 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2367 mode, uid, gid, NULL, NULL, 0);
2370 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
2371 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2373 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2374 uid, gid, NULL, NULL, rdev);
2377 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
2378 __u32 mode, __u32 uid, __u32 gid,
2379 const YCHAR * alias)
2381 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2382 uid, gid, NULL, alias, 0);
2385 /* yaffs_Link returns the object id of the equivalent object.*/
2386 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
2387 yaffs_Object * equivalentObject)
2389 /* Get the real object in case we were fed a hard link as an equivalent object */
2390 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2392 if (yaffs_MknodObject
2393 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2394 equivalentObject, NULL, 0)) {
2395 return equivalentObject;
2402 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
2403 const YCHAR * newName, int force, int shadows)
2408 yaffs_Object *existingTarget;
2410 if (newDir == NULL) {
2411 newDir = obj->parent; /* use the old directory */
2414 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2415 T(YAFFS_TRACE_ALWAYS,
2417 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
2422 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2423 if (obj->myDev->isYaffs2) {
2424 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2426 unlinkOp = (newDir == obj->myDev->unlinkedDir
2427 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2430 deleteOp = (newDir == obj->myDev->deletedDir);
2432 existingTarget = yaffs_FindObjectByName(newDir, newName);
2434 /* If the object is a file going into the unlinked directory,
2435 * then it is OK to just stuff it in since duplicate names are allowed.
2436 * else only proceed if the new name does not exist and if we're putting
2437 * it into a directory.
2444 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2445 yaffs_SetObjectName(obj, newName);
2448 yaffs_AddObjectToDirectory(newDir, obj);
2453 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2454 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
2461 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
2462 yaffs_Object * newDir, const YCHAR * newName)
2465 yaffs_Object *existingTarget;
2468 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2469 /* Special case for case insemsitive systems (eg. WinCE).
2470 * While look-up is case insensitive, the name isn't.
2471 * Therefore we might want to change x.txt to X.txt
2473 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
2478 obj = yaffs_FindObjectByName(oldDir, oldName);
2479 /* Check new name to long. */
2480 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
2481 yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
2484 else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
2485 yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2489 if (obj && obj->renameAllowed) {
2491 /* Now do the handling for an existing target, if there is one */
2493 existingTarget = yaffs_FindObjectByName(newDir, newName);
2494 if (existingTarget &&
2495 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2496 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2497 /* There is a target that is a non-empty directory, so we fail */
2498 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2499 } else if (existingTarget && existingTarget != obj) {
2500 /* Nuke the target first, using shadowing,
2501 * but only if it isn't the same object
2503 yaffs_ChangeObjectName(obj, newDir, newName, force,
2504 existingTarget->objectId);
2505 yaffs_UnlinkObject(existingTarget);
2508 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2513 /*------------------------- Block Management and Page Allocation ----------------*/
2515 static int yaffs_InitialiseBlocks(yaffs_Device * dev)
2517 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2519 dev->blockInfo = NULL;
2520 dev->chunkBits = NULL;
2522 dev->allocationBlock = -1; /* force it to get a new one */
2524 /* If the first allocation strategy fails, thry the alternate one */
2525 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2526 if(!dev->blockInfo){
2527 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2528 dev->blockInfoAlt = 1;
2531 dev->blockInfoAlt = 0;
2535 /* Set up dynamic blockinfo stuff. */
2536 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2537 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2538 if(!dev->chunkBits){
2539 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2540 dev->chunkBitsAlt = 1;
2543 dev->chunkBitsAlt = 0;
2546 if (dev->blockInfo && dev->chunkBits) {
2547 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2548 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2556 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
2558 if(dev->blockInfoAlt && dev->blockInfo)
2559 YFREE_ALT(dev->blockInfo);
2560 else if(dev->blockInfo)
2561 YFREE(dev->blockInfo);
2563 dev->blockInfoAlt = 0;
2565 dev->blockInfo = NULL;
2567 if(dev->chunkBitsAlt && dev->chunkBits)
2568 YFREE_ALT(dev->chunkBits);
2569 else if(dev->chunkBits)
2570 YFREE(dev->chunkBits);
2571 dev->chunkBitsAlt = 0;
2572 dev->chunkBits = NULL;
2575 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
2576 yaffs_BlockInfo * bi)
2583 return 1; /* disqualification only applies to yaffs2. */
2585 if (!bi->hasShrinkHeader)
2586 return 1; /* can gc */
2588 /* Find the oldest dirty sequence number if we don't know it and save it
2589 * so we don't have to keep recomputing it.
2591 if (!dev->oldestDirtySequence) {
2592 seq = dev->sequenceNumber;
2594 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2596 b = yaffs_GetBlockInfo(dev, i);
2597 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2598 (b->pagesInUse - b->softDeletions) <
2599 dev->nChunksPerBlock && b->sequenceNumber < seq) {
2600 seq = b->sequenceNumber;
2603 dev->oldestDirtySequence = seq;
2606 /* Can't do gc of this block if there are any blocks older than this one that have
2609 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2613 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2614 * for garbage collection.
2617 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
2621 int b = dev->currentDirtyChecker;
2628 yaffs_BlockInfo *bi;
2629 int pendingPrioritisedExist = 0;
2631 /* First let's see if we need to grab a prioritised block */
2632 if(dev->hasPendingPrioritisedGCs){
2633 for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
2635 bi = yaffs_GetBlockInfo(dev, i);
2636 //yaffs_VerifyBlock(dev,bi,i);
2638 if(bi->gcPrioritise) {
2639 pendingPrioritisedExist = 1;
2640 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2641 yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
2642 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2645 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2650 if(!pendingPrioritisedExist) /* None found, so we can clear this */
2651 dev->hasPendingPrioritisedGCs = 0;
2654 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2656 * else (we're doing a leasurely gc), then we only bother to do this if the
2657 * block has only a few pages in use.
2660 dev->nonAggressiveSkip--;
2662 if (!aggressive && (dev->nonAggressiveSkip > 0)) {
2668 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2672 dev->internalEndBlock - dev->internalStartBlock + 1;
2675 dev->internalEndBlock - dev->internalStartBlock + 1;
2676 iterations = iterations / 16;
2677 if (iterations > 200) {
2682 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2684 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2685 b = dev->internalStartBlock;
2688 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2689 T(YAFFS_TRACE_ERROR,
2690 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2694 bi = yaffs_GetBlockInfo(dev, b);
2697 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
2704 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2705 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2706 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2708 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2712 dev->currentDirtyChecker = b;
2716 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2717 dev->nChunksPerBlock - pagesInUse,prioritised));
2720 dev->oldestDirtySequence = 0;
2723 dev->nonAggressiveSkip = 4;
2729 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
2731 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2735 /* If the block is still healthy erase it and mark as clean.
2736 * If the block has had a data failure, then retire it.
2739 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2740 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2741 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2743 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2745 if (!bi->needsRetiring) {
2746 yaffs_InvalidateCheckpoint(dev);
2747 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2749 dev->nErasureFailures++;
2750 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2751 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2756 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2758 for (i = 0; i < dev->nChunksPerBlock; i++) {
2759 if (!yaffs_CheckChunkErased
2760 (dev, blockNo * dev->nChunksPerBlock + i)) {
2761 T(YAFFS_TRACE_ERROR,
2763 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2764 TENDSTR), blockNo, i));
2770 /* Clean it up... */
2771 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2772 dev->nErasedBlocks++;
2774 bi->softDeletions = 0;
2775 bi->hasShrinkHeader = 0;
2776 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2777 bi->gcPrioritise = 0;
2778 yaffs_ClearChunkBits(dev, blockNo);
2780 T(YAFFS_TRACE_ERASE,
2781 (TSTR("Erased block %d" TENDSTR), blockNo));
2783 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
2785 yaffs_RetireBlock(dev, blockNo);
2786 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2787 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2791 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2795 yaffs_BlockInfo *bi;
2797 if (dev->nErasedBlocks < 1) {
2798 /* Hoosterman we've got a problem.
2799 * Can't get space to gc
2801 T(YAFFS_TRACE_ERROR,
2802 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2807 /* Find an empty block. */
2809 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2810 dev->allocationBlockFinder++;
2811 if (dev->allocationBlockFinder < dev->internalStartBlock
2812 || dev->allocationBlockFinder > dev->internalEndBlock) {
2813 dev->allocationBlockFinder = dev->internalStartBlock;
2816 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2818 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2819 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2820 dev->sequenceNumber++;
2821 bi->sequenceNumber = dev->sequenceNumber;
2822 dev->nErasedBlocks--;
2823 T(YAFFS_TRACE_ALLOCATE,
2824 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2825 dev->allocationBlockFinder, dev->sequenceNumber,
2826 dev->nErasedBlocks));
2827 return dev->allocationBlockFinder;
2831 T(YAFFS_TRACE_ALWAYS,
2833 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2834 TENDSTR), dev->nErasedBlocks));
2841 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2843 if(!dev->nCheckpointBlocksRequired){
2844 /* Not a valid value so recalculate */
2847 int devBlocks = (dev->endBlock - dev->startBlock + 1);
2850 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
2852 if(tnodeSize < sizeof(yaffs_Tnode))
2853 tnodeSize = sizeof(yaffs_Tnode);
2855 nBytes += sizeof(yaffs_CheckpointValidity);
2856 nBytes += sizeof(yaffs_CheckpointDevice);
2857 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2858 nBytes += devBlocks * dev->chunkBitmapStride;
2859 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2860 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2861 nBytes += sizeof(yaffs_CheckpointValidity);
2862 nBytes += sizeof(__u32); /* checksum*/
2864 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2866 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
2868 dev->nCheckpointBlocksRequired = nBlocks;
2871 return dev->nCheckpointBlocksRequired;
2874 // Check if there's space to allocate...
2875 // Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2876 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2879 int reservedBlocks = dev->nReservedBlocks;
2880 int checkpointBlocks;
2882 checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
2883 if(checkpointBlocks < 0)
2884 checkpointBlocks = 0;
2886 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2888 return (dev->nFreeChunks > reservedChunks);
2891 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
2894 yaffs_BlockInfo *bi;
2896 if (dev->allocationBlock < 0) {
2897 /* Get next block to allocate off */
2898 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2899 dev->allocationPage = 0;
2902 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2903 /* Not enough space to allocate unless we're allowed to use the reserve. */
2907 if (dev->nErasedBlocks < dev->nReservedBlocks
2908 && dev->allocationPage == 0) {
2909 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2912 /* Next page please.... */
2913 if (dev->allocationBlock >= 0) {
2914 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2916 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2917 dev->allocationPage;
2919 yaffs_SetChunkBit(dev, dev->allocationBlock,
2920 dev->allocationPage);
2922 dev->allocationPage++;
2926 /* If the block is full set the state to full */
2927 if (dev->allocationPage >= dev->nChunksPerBlock) {
2928 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2929 dev->allocationBlock = -1;
2938 T(YAFFS_TRACE_ERROR,
2939 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2944 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2948 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2950 if (dev->allocationBlock > 0) {
2951 n += (dev->nChunksPerBlock - dev->allocationPage);
2958 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2964 int retVal = YAFFS_OK;
2967 int isCheckpointBlock;
2970 int chunksBefore = yaffs_GetErasedChunks(dev);
2973 yaffs_ExtendedTags tags;
2975 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2977 yaffs_Object *object;
2979 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2981 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2983 T(YAFFS_TRACE_TRACING,
2984 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2985 bi->pagesInUse, bi->hasShrinkHeader));
2987 /*yaffs_VerifyFreeChunks(dev); */
2989 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2991 /* Take off the number of soft deleted entries because
2992 * they're going to get really deleted during GC.
2994 dev->nFreeChunks -= bi->softDeletions;
2998 if (isCheckpointBlock ||
2999 !yaffs_StillSomeChunkBits(dev, block)) {
3000 T(YAFFS_TRACE_TRACING,
3002 ("Collecting block %d that has no chunks in use" TENDSTR),
3004 yaffs_BlockBecameDirty(dev, block);
3007 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3009 yaffs_VerifyBlock(dev,bi,block);
3011 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
3012 chunkInBlock < dev->nChunksPerBlock
3013 && yaffs_StillSomeChunkBits(dev, block);
3014 chunkInBlock++, oldChunk++) {
3015 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
3017 /* This page is in use and might need to be copied off */
3021 yaffs_InitialiseTags(&tags);
3023 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3027 yaffs_FindObjectByNumber(dev,
3030 T(YAFFS_TRACE_GC_DETAIL,
3032 ("Collecting page %d, %d %d %d " TENDSTR),
3033 chunkInBlock, tags.objectId, tags.chunkId,
3036 if(object && !yaffs_SkipVerification(dev)){
3037 if(tags.chunkId == 0)
3038 matchingChunk = object->chunkId;
3039 else if(object->softDeleted)
3040 matchingChunk = oldChunk; /* Defeat the test */
3042 matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
3044 if(oldChunk != matchingChunk)
3045 T(YAFFS_TRACE_ERROR,
3046 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3047 oldChunk,matchingChunk,tags.objectId, tags.chunkId));
3052 T(YAFFS_TRACE_ERROR,
3054 ("page %d in gc has no object: %d %d %d "
3056 tags.objectId, tags.chunkId, tags.byteCount));
3059 if (object && object->deleted
3060 && tags.chunkId != 0) {
3061 /* Data chunk in a deleted file, throw it away
3062 * It's a soft deleted data chunk,
3063 * No need to copy this, just forget about it and
3064 * fix up the object.
3067 object->nDataChunks--;
3069 if (object->nDataChunks <= 0) {
3070 /* remeber to clean up the object */
3071 dev->gcCleanupList[cleanups] =
3077 /* Todo object && object->deleted && object->nDataChunks == 0 */
3079 /* Deleted object header with no data chunks.
3080 * Can be discarded and the file deleted.
3082 object->chunkId = 0;
3083 yaffs_FreeTnode(object->myDev,
3086 object->variant.fileVariant.top = NULL;
3087 yaffs_DoGenericObjectDeletion(object);
3089 } else if (object) {
3090 /* It's either a data chunk in a live file or
3091 * an ObjectHeader, so we're interested in it.
3092 * NB Need to keep the ObjectHeaders of deleted files
3093 * until the whole file has been deleted off
3095 tags.serialNumber++;
3099 if (tags.chunkId == 0) {
3100 /* It is an object Id,
3101 * We need to nuke the shrinkheader flags first
3102 * We no longer want the shrinkHeader flag since its work is done
3103 * and if it is left in place it will mess up scanning.
3104 * Also, clear out any shadowing stuff
3107 yaffs_ObjectHeader *oh;
3108 oh = (yaffs_ObjectHeader *)buffer;
3110 oh->shadowsObject = oh->inbandShadowsObject = -1;
3111 tags.extraShadows = 0;
3112 tags.extraIsShrinkHeader = 0;
3114 yaffs_VerifyObjectHeader(object,oh,&tags,1);
3118 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3121 retVal = YAFFS_FAIL;
3124 /* Ok, now fix up the Tnodes etc. */
3126 if (tags.chunkId == 0) {
3128 object->chunkId = newChunk;
3129 object->serial = tags.serialNumber;
3131 /* It's a data chunk */
3132 yaffs_PutChunkIntoFile
3140 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3145 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3148 /* Do any required cleanups */
3149 for (i = 0; i < cleanups; i++) {
3150 /* Time to delete the file too */
3152 yaffs_FindObjectByNumber(dev,
3153 dev->gcCleanupList[i]);
3155 yaffs_FreeTnode(dev,
3156 object->variant.fileVariant.
3158 object->variant.fileVariant.top = NULL;
3161 ("yaffs: About to finally delete object %d"
3162 TENDSTR), object->objectId));
3163 yaffs_DoGenericObjectDeletion(object);
3164 object->myDev->nDeletedFiles--;
3171 yaffs_VerifyCollectedBlock(dev,bi,block);
3173 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
3176 ("gc did not increase free chunks before %d after %d"
3177 TENDSTR), chunksBefore, chunksAfter));
3185 /* New garbage collector
3186 * If we're very low on erased blocks then we do aggressive garbage collection
3187 * otherwise we do "leasurely" garbage collection.
3188 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3189 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3191 * The idea is to help clear out space in a more spread-out manner.
3192 * Dunno if it really does anything useful.
3194 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
3198 int gcOk = YAFFS_OK;
3201 int checkpointBlockAdjust;
3203 if (dev->isDoingGC) {
3204 /* Bail out so we don't get recursive gc */
3208 /* This loop should pass the first time.
3209 * We'll only see looping here if the erase of the collected block fails.
3215 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3216 if(checkpointBlockAdjust < 0)
3217 checkpointBlockAdjust = 0;
3219 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3220 /* We need a block soon...*/
3223 /* We're in no hurry */
3227 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3230 dev->garbageCollections++;
3232 dev->passiveGarbageCollections++;
3237 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3238 dev->nErasedBlocks, aggressive));
3240 gcOk = yaffs_GarbageCollectBlock(dev, block);
3243 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3246 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3247 TENDSTR), dev->nErasedBlocks, maxTries, block));
3249 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
3252 return aggressive ? gcOk : YAFFS_OK;
3255 /*------------------------- TAGS --------------------------------*/
3257 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
3260 return (tags->chunkId == chunkInObject &&
3261 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3266 /*-------------------- Data file manipulation -----------------*/
3268 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
3269 yaffs_ExtendedTags * tags)
3271 /*Get the Tnode, then get the level 0 offset chunk offset */
3274 yaffs_ExtendedTags localTags;
3277 yaffs_Device *dev = in->myDev;
3280 /* Passed a NULL, so use our own tags space */
3284 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3287 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3290 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3296 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
3297 yaffs_ExtendedTags * tags)
3299 /* Get the Tnode, then get the level 0 offset chunk offset */
3302 yaffs_ExtendedTags localTags;
3304 yaffs_Device *dev = in->myDev;
3308 /* Passed a NULL, so use our own tags space */
3312 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3316 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3319 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3322 /* Delete the entry in the filestructure (if found) */
3324 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
3327 /*T(("No level 0 found for %d\n", chunkInInode)); */
3331 /* T(("Could not find %d to delete\n",chunkInInode)); */
3336 #ifdef YAFFS_PARANOID
3338 static int yaffs_CheckFileSanity(yaffs_Object * in)
3346 yaffs_Tags localTags;
3347 yaffs_Tags *tags = &localTags;
3351 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3352 /* T(("Object not a file\n")); */
3356 objId = in->objectId;
3357 fSize = in->variant.fileVariant.fileSize;
3359 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3361 for (chunk = 1; chunk <= nChunks; chunk++) {
3362 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3367 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
3369 if (yaffs_CheckChunkBits
3370 (dev, theChunk / dev->nChunksPerBlock,
3371 theChunk % dev->nChunksPerBlock)) {
3373 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3377 (tags, in->objectId, chunk, chunkDeleted)) {
3387 /* T(("No level 0 found for %d\n", chunk)); */
3391 return failed ? YAFFS_FAIL : YAFFS_OK;
3396 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
3397 int chunkInNAND, int inScan)
3399 /* NB inScan is zero unless scanning.
3400 * For forward scanning, inScan is > 0;
3401 * for backward scanning inScan is < 0
3405 yaffs_Device *dev = in->myDev;
3407 yaffs_ExtendedTags existingTags;
3408 yaffs_ExtendedTags newTags;
3409 unsigned existingSerial, newSerial;
3411 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3412 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3413 * If it is not during Scanning then something went wrong!
3416 T(YAFFS_TRACE_ERROR,
3418 ("yaffs tragedy:attempt to put data chunk into a non-file"
3423 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3427 tn = yaffs_AddOrFindLevel0Tnode(dev,
3428 &in->variant.fileVariant,
3435 existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3438 /* If we're scanning then we need to test for duplicates
3439 * NB This does not need to be efficient since it should only ever
3440 * happen when the power fails during a write, then only one
3441 * chunk should ever be affected.
3443 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3444 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3447 if (existingChunk != 0) {
3448 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3449 * thus we have to do a FindChunkInFile to get the real chunk id.
3451 * We have a duplicate now we need to decide which one to use:
3453 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3454 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3455 * YAFFS1: Get both sets of tags and compare serial numbers.
3459 /* Only do this for forward scanning */
3460 yaffs_ReadChunkWithTagsFromNAND(dev,
3464 /* Do a proper find */
3466 yaffs_FindChunkInFile(in, chunkInInode,
3470 if (existingChunk <= 0) {
3471 /*Hoosterman - how did this happen? */
3473 T(YAFFS_TRACE_ERROR,
3475 ("yaffs tragedy: existing chunk < 0 in scan"
3480 /* NB The deleted flags should be false, otherwise the chunks will
3481 * not be loaded during a scan
3484 newSerial = newTags.serialNumber;
3485 existingSerial = existingTags.serialNumber;
3488 (in->myDev->isYaffs2 ||
3489 existingChunk <= 0 ||
3490 ((existingSerial + 1) & 3) == newSerial)) {
3491 /* Forward scanning.
3493 * Delete the old one and drop through to update the tnode
3495 yaffs_DeleteChunk(dev, existingChunk, 1,
3498 /* Backward scanning or we want to use the existing one
3500 * Delete the new one and return early so that the tnode isn't changed
3502 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3510 if (existingChunk == 0) {
3514 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
3519 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
3522 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3524 if (chunkInNAND >= 0) {
3525 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3528 T(YAFFS_TRACE_NANDACCESS,
3529 (TSTR("Chunk %d not found zero instead" TENDSTR),
3531 /* get sane (zero) data if you read a hole */
3532 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3538 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
3542 yaffs_ExtendedTags tags;
3543 yaffs_BlockInfo *bi;
3550 block = chunkId / dev->nChunksPerBlock;
3551 page = chunkId % dev->nChunksPerBlock;
3554 if(!yaffs_CheckChunkBit(dev,block,page))
3555 T(YAFFS_TRACE_VERIFY,
3556 (TSTR("Deleting invalid chunk %d"TENDSTR),
3559 bi = yaffs_GetBlockInfo(dev, block);
3561 T(YAFFS_TRACE_DELETION,
3562 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3565 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3567 yaffs_InitialiseTags(&tags);
3569 tags.chunkDeleted = 1;
3571 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3572 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3574 dev->nUnmarkedDeletions++;
3577 /* Pull out of the management area.
3578 * If the whole block became dirty, this will kick off an erasure.
3580 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3581 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3582 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3583 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3586 yaffs_ClearChunkBit(dev, block, page);
3590 if (bi->pagesInUse == 0 &&
3591 !bi->hasShrinkHeader &&
3592 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3593 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3594 yaffs_BlockBecameDirty(dev, block);
3598 /* T(("Bad news deleting chunk %d\n",chunkId)); */
3603 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
3604 const __u8 * buffer, int nBytes,
3607 /* Find old chunk Need to do this to get serial number
3608 * Write new one and patch into tree.
3609 * Invalidate old tags.
3613 yaffs_ExtendedTags prevTags;
3616 yaffs_ExtendedTags newTags;
3618 yaffs_Device *dev = in->myDev;
3620 yaffs_CheckGarbageCollection(dev);
3622 /* Get the previous chunk at this location in the file if it exists */
3623 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3625 /* Set up new tags */
3626 yaffs_InitialiseTags(&newTags);
3628 newTags.chunkId = chunkInInode;
3629 newTags.objectId = in->objectId;
3630 newTags.serialNumber =
3631 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3632 newTags.byteCount = nBytes;
3635 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3638 if (newChunkId >= 0) {
3639 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3641 if (prevChunkId >= 0) {
3642 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3646 yaffs_CheckFileSanity(in);
3652 /* UpdateObjectHeader updates the header on NAND for an object.
3653 * If name is not NULL, then that new name is used.
3655 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
3656 int isShrink, int shadows)
3659 yaffs_BlockInfo *bi;
3661 yaffs_Device *dev = in->myDev;
3668 yaffs_ExtendedTags newTags;
3669 yaffs_ExtendedTags oldTags;
3671 __u8 *buffer = NULL;
3672 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3674 yaffs_ObjectHeader *oh = NULL;
3676 yaffs_strcpy(oldName,"silly old name");
3678 if (!in->fake || force) {
3680 yaffs_CheckGarbageCollection(dev);
3681 yaffs_CheckObjectDetailsLoaded(in);
3683 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3684 oh = (yaffs_ObjectHeader *) buffer;
3686 prevChunkId = in->chunkId;
3688 if (prevChunkId >= 0) {
3689 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3692 yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
3694 memcpy(oldName, oh->name, sizeof(oh->name));
3697 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3699 oh->type = in->variantType;
3700 oh->yst_mode = in->yst_mode;
3701 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3703 #ifdef CONFIG_YAFFS_WINCE
3704 oh->win_atime[0] = in->win_atime[0];
3705 oh->win_ctime[0] = in->win_ctime[0];
3706 oh->win_mtime[0] = in->win_mtime[0];
3707 oh->win_atime[1] = in->win_atime[1];
3708 oh->win_ctime[1] = in->win_ctime[1];
3709 oh->win_mtime[1] = in->win_mtime[1];
3711 oh->yst_uid = in->yst_uid;
3712 oh->yst_gid = in->yst_gid;
3713 oh->yst_atime = in->yst_atime;
3714 oh->yst_mtime = in->yst_mtime;
3715 oh->yst_ctime = in->yst_ctime;
3716 oh->yst_rdev = in->yst_rdev;
3719 oh->parentObjectId = in->parent->objectId;
3721 oh->parentObjectId = 0;
3724 if (name && *name) {
3725 memset(oh->name, 0, sizeof(oh->name));
3726 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3727 } else if (prevChunkId>=0) {
3728 memcpy(oh->name, oldName, sizeof(oh->name));
3730 memset(oh->name, 0, sizeof(oh->name));
3733 oh->isShrink = isShrink;
3735 switch (in->variantType) {
3736 case YAFFS_OBJECT_TYPE_UNKNOWN:
3737 /* Should not happen */
3739 case YAFFS_OBJECT_TYPE_FILE:
3741 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3742 || oh->parentObjectId ==
3743 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3744 fileVariant.fileSize;
3746 case YAFFS_OBJECT_TYPE_HARDLINK:
3747 oh->equivalentObjectId =
3748 in->variant.hardLinkVariant.equivalentObjectId;
3750 case YAFFS_OBJECT_TYPE_SPECIAL:
3753 case YAFFS_OBJECT_TYPE_DIRECTORY:
3756 case YAFFS_OBJECT_TYPE_SYMLINK:
3757 yaffs_strncpy(oh->alias,
3758 in->variant.symLinkVariant.alias,
3759 YAFFS_MAX_ALIAS_LENGTH);
3760 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3765 yaffs_InitialiseTags(&newTags);
3767 newTags.chunkId = 0;
3768 newTags.objectId = in->objectId;
3769 newTags.serialNumber = in->serial;
3771 /* Add extra info for file header */
3773 newTags.extraHeaderInfoAvailable = 1;
3774 newTags.extraParentObjectId = oh->parentObjectId;
3775 newTags.extraFileLength = oh->fileSize;
3776 newTags.extraIsShrinkHeader = oh->isShrink;
3777 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3778 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3779 newTags.extraObjectType = in->variantType;
3781 yaffs_VerifyObjectHeader(in,oh,&newTags,1);
3783 /* Create new chunk in NAND */
3785 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3786 (prevChunkId >= 0) ? 1 : 0);
3788 if (newChunkId >= 0) {
3790 in->chunkId = newChunkId;
3792 if (prevChunkId >= 0) {
3793 yaffs_DeleteChunk(dev, prevChunkId, 1,
3797 if(!yaffs_ObjectHasCachedWriteData(in))
3800 /* If this was a shrink, then mark the block that the chunk lives on */
3802 bi = yaffs_GetBlockInfo(in->myDev,
3803 newChunkId /in->myDev-> nChunksPerBlock);
3804 bi->hasShrinkHeader = 1;
3809 retVal = newChunkId;
3814 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3819 /*------------------------ Short Operations Cache ----------------------------------------
3820 * In many situations where there is no high level buffering (eg WinCE) a lot of
3821 * reads might be short sequential reads, and a lot of writes may be short
3822 * sequential writes. eg. scanning/writing a jpeg file.
3823 * In these cases, a short read/write cache can provide a huge perfomance benefit
3824 * with dumb-as-a-rock code.
3825 * In Linux, the page cache provides read buffering aand the short op cache provides write
3828 * There are a limited number (~10) of cache chunks per device so that we don't
3829 * need a very intelligent search.
3832 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3834 yaffs_Device *dev = obj->myDev;
3836 yaffs_ChunkCache *cache;
3837 int nCaches = obj->myDev->nShortOpCaches;
3839 for(i = 0; i < nCaches; i++){
3840 cache = &dev->srCache[i];
3841 if (cache->object == obj &&
3850 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
3852 yaffs_Device *dev = obj->myDev;
3853 int lowest = -99; /* Stop compiler whining. */
3855 yaffs_ChunkCache *cache;
3856 int chunkWritten = 0;
3857 int nCaches = obj->myDev->nShortOpCaches;
3863 /* Find the dirty cache for this object with the lowest chunk id. */
3864 for (i = 0; i < nCaches; i++) {
3865 if (dev->srCache[i].object == obj &&
3866 dev->srCache[i].dirty) {
3868 || dev->srCache[i].chunkId <
3870 cache = &dev->srCache[i];
3871 lowest = cache->chunkId;
3876 if (cache && !cache->locked) {
3877 /* Write it out and free it up */
3880 yaffs_WriteChunkDataToObject(cache->object,
3886 cache->object = NULL;
3889 } while (cache && chunkWritten > 0);
3892 /* Hoosterman, disk full while writing cache out. */
3893 T(YAFFS_TRACE_ERROR,
3894 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3901 /*yaffs_FlushEntireDeviceCache(dev)
3906 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3909 int nCaches = dev->nShortOpCaches;
3912 /* Find a dirty object in the cache and flush it...
3913 * until there are no further dirty objects.
3917 for( i = 0; i < nCaches && !obj; i++) {
3918 if (dev->srCache[i].object &&
3919 dev->srCache[i].dirty)
3920 obj = dev->srCache[i].object;
3924 yaffs_FlushFilesChunkCache(obj);
3931 /* Grab us a cache chunk for use.
3932 * First look for an empty one.
3933 * Then look for the least recently used non-dirty one.
3934 * Then look for the least recently used dirty one...., flush and look again.
3936 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3942 if (dev->nShortOpCaches > 0) {
3943 for (i = 0; i < dev->nShortOpCaches; i++) {
3944 if (!dev->srCache[i].object)
3945 return &dev->srCache[i];
3951 usage = 0; /* just to stop the compiler grizzling */
3953 for (i = 0; i < dev->nShortOpCaches; i++) {
3954 if (!dev->srCache[i].dirty &&
3955 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3957 usage = dev->srCache[i].lastUse;
3963 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3970 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3972 yaffs_ChunkCache *cache;
3973 yaffs_Object *theObj;
3978 if (dev->nShortOpCaches > 0) {
3979 /* Try find a non-dirty one... */
3981 cache = yaffs_GrabChunkCacheWorker(dev);
3984 /* They were all dirty, find the last recently used object and flush
3985 * its cache, then find again.
3986 * NB what's here is not very accurate, we actually flush the object
3987 * the last recently used page.
3990 /* With locking we can't assume we can use entry zero */
3997 for (i = 0; i < dev->nShortOpCaches; i++) {
3998 if (dev->srCache[i].object &&
3999 !dev->srCache[i].locked &&
4000 (dev->srCache[i].lastUse < usage || !cache))
4002 usage = dev->srCache[i].lastUse;
4003 theObj = dev->srCache[i].object;
4004 cache = &dev->srCache[i];
4009 if (!cache || cache->dirty) {
4010 /* Flush and try again */
4011 yaffs_FlushFilesChunkCache(theObj);
4012 cache = yaffs_GrabChunkCacheWorker(dev);
4022 /* Find a cached chunk */
4023 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
4026 yaffs_Device *dev = obj->myDev;
4028 if (dev->nShortOpCaches > 0) {
4029 for (i = 0; i < dev->nShortOpCaches; i++) {
4030 if (dev->srCache[i].object == obj &&
4031 dev->srCache[i].chunkId == chunkId) {
4034 return &dev->srCache[i];
4041 /* Mark the chunk for the least recently used algorithym */
4042 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
4046 if (dev->nShortOpCaches > 0) {
4047 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4048 /* Reset the cache usages */
4050 for (i = 1; i < dev->nShortOpCaches; i++) {
4051 dev->srCache[i].lastUse = 0;
4058 cache->lastUse = dev->srLastUse;
4066 /* Invalidate a single cache page.
4067 * Do this when a whole page gets written,
4068 * ie the short cache for this page is no longer valid.
4070 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
4072 if (object->myDev->nShortOpCaches > 0) {
4073 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4076 cache->object = NULL;
4081 /* Invalidate all the cache pages associated with this object
4082 * Do this whenever ther file is deleted or resized.
4084 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
4087 yaffs_Device *dev = in->myDev;
4089 if (dev->nShortOpCaches > 0) {
4090 /* Invalidate it. */
4091 for (i = 0; i < dev->nShortOpCaches; i++) {
4092 if (dev->srCache[i].object == in) {
4093 dev->srCache[i].object = NULL;
4099 /*--------------------- Checkpointing --------------------*/
4102 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
4104 yaffs_CheckpointValidity cp;
4106 memset(&cp,0,sizeof(cp));
4108 cp.structType = sizeof(cp);
4109 cp.magic = YAFFS_MAGIC;
4110 cp.version = YAFFS_CHECKPOINT_VERSION;
4111 cp.head = (head) ? 1 : 0;
4113 return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
4117 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4119 yaffs_CheckpointValidity cp;
4122 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4125 ok = (cp.structType == sizeof(cp)) &&
4126 (cp.magic == YAFFS_MAGIC) &&
4127 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4128 (cp.head == ((head) ? 1 : 0));
4132 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4135 cp->nErasedBlocks = dev->nErasedBlocks;
4136 cp->allocationBlock = dev->allocationBlock;
4137 cp->allocationPage = dev->allocationPage;
4138 cp->nFreeChunks = dev->nFreeChunks;
4140 cp->nDeletedFiles = dev->nDeletedFiles;
4141 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4142 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4143 cp->sequenceNumber = dev->sequenceNumber;
4144 cp->oldestDirtySequence = dev->oldestDirtySequence;
4148 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4149 yaffs_CheckpointDevice *cp)
4151 dev->nErasedBlocks = cp->nErasedBlocks;
4152 dev->allocationBlock = cp->allocationBlock;
4153 dev->allocationPage = cp->allocationPage;
4154 dev->nFreeChunks = cp->nFreeChunks;
4156 dev->nDeletedFiles = cp->nDeletedFiles;
4157 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4158 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4159 dev->sequenceNumber = cp->sequenceNumber;
4160 dev->oldestDirtySequence = cp->oldestDirtySequence;
4164 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4166 yaffs_CheckpointDevice cp;
4168 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4172 /* Write device runtime values*/
4173 yaffs_DeviceToCheckpointDevice(&cp,dev);
4174 cp.structType = sizeof(cp);
4176 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4178 /* Write block info */
4180 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4181 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
4184 /* Write chunk bits */
4186 nBytes = nBlocks * dev->chunkBitmapStride;
4187 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
4193 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4195 yaffs_CheckpointDevice cp;
4197 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4201 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4205 if(cp.structType != sizeof(cp))
4209 yaffs_CheckpointDeviceToDevice(dev,&cp);
4211 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4213 ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
4217 nBytes = nBlocks * dev->chunkBitmapStride;
4219 ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
4224 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4228 cp->objectId = obj->objectId;
4229 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4230 cp->chunkId = obj->chunkId;
4231 cp->variantType = obj->variantType;
4232 cp->deleted = obj->deleted;
4233 cp->softDeleted = obj->softDeleted;
4234 cp->unlinked = obj->unlinked;
4235 cp->fake = obj->fake;
4236 cp->renameAllowed = obj->renameAllowed;
4237 cp->unlinkAllowed = obj->unlinkAllowed;
4238 cp->serial = obj->serial;
4239 cp->nDataChunks = obj->nDataChunks;
4241 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4242 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4243 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4244 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4247 static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
4250 yaffs_Object *parent;
4252 obj->objectId = cp->objectId;
4255 parent = yaffs_FindOrCreateObjectByNumber(
4258 YAFFS_OBJECT_TYPE_DIRECTORY);
4263 yaffs_AddObjectToDirectory(parent, obj);
4265 obj->chunkId = cp->chunkId;
4266 obj->variantType = cp->variantType;
4267 obj->deleted = cp->deleted;
4268 obj->softDeleted = cp->softDeleted;
4269 obj->unlinked = cp->unlinked;
4270 obj->fake = cp->fake;
4271 obj->renameAllowed = cp->renameAllowed;
4272 obj->unlinkAllowed = cp->unlinkAllowed;
4273 obj->serial = cp->serial;
4274 obj->nDataChunks = cp->nDataChunks;
4276 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4277 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4278 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4279 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4281 if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
4282 obj->lazyLoaded = 1;
4287 static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
4288 __u32 level, int chunkOffset)
4291 yaffs_Device *dev = in->myDev;
4293 int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4295 if(tnodeSize < sizeof(yaffs_Tnode))
4296 tnodeSize = sizeof(yaffs_Tnode);
4302 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
4303 if (tn->internal[i]) {
4304 ok = yaffs_CheckpointTnodeWorker(in,
4307 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4310 } else if (level == 0) {
4311 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4312 /* printf("write tnode at %d\n",baseOffset); */
4313 ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
4315 ok = (yaffs_CheckpointWrite(dev,tn,tnodeSize) == tnodeSize);
4323 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4325 __u32 endMarker = ~0;
4328 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4329 ok = yaffs_CheckpointTnodeWorker(obj,
4330 obj->variant.fileVariant.top,
4331 obj->variant.fileVariant.topLevel,
4334 ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
4341 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4345 yaffs_Device *dev = obj->myDev;
4346 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4349 int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4351 if(tnodeSize < sizeof(yaffs_Tnode))
4352 tnodeSize = sizeof(yaffs_Tnode);
4354 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4356 while(ok && (~baseChunk)){
4358 /* Read level 0 tnode */
4361 /* printf("read tnode at %d\n",baseChunk); */
4362 tn = yaffs_GetTnodeRaw(dev);
4364 ok = (yaffs_CheckpointRead(dev,tn,tnodeSize) == tnodeSize);
4369 ok = yaffs_AddOrFindLevel0Tnode(dev,
4377 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4381 T(YAFFS_TRACE_CHECKPOINT,(
4382 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4383 nread,baseChunk,ok));
4389 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4392 yaffs_CheckpointObject cp;
4395 struct ylist_head *lh;
4398 /* Iterate through the objects in each hash entry,
4399 * dumping them to the checkpointing stream.
4402 for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
4403 ylist_for_each(lh, &dev->objectBucket[i].list) {
4405 obj = ylist_entry(lh, yaffs_Object, hashLink);
4406 if (!obj->deferedFree) {
4407 yaffs_ObjectToCheckpointObject(&cp,obj);
4408 cp.structType = sizeof(cp);
4410 T(YAFFS_TRACE_CHECKPOINT,(
4411 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4412 cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
4414 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4416 if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4417 ok = yaffs_WriteCheckpointTnodes(obj);
4424 /* Dump end of list */
4425 memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
4426 cp.structType = sizeof(cp);
4429 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4434 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4437 yaffs_CheckpointObject cp;
4440 yaffs_Object *hardList = NULL;
4442 while(ok && !done) {
4443 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4444 if(cp.structType != sizeof(cp)) {
4445 T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
4446 cp.structType,sizeof(cp),ok));
4450 T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4451 cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
4453 if(ok && cp.objectId == ~0)
4456 obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
4458 yaffs_CheckpointObjectToObject(obj,&cp);
4459 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4460 ok = yaffs_ReadCheckpointTnodes(obj);
4461 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4462 obj->hardLinks.next =
4463 (struct ylist_head *)
4473 yaffs_HardlinkFixup(dev,hardList);
4478 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4480 __u32 checkpointSum;
4483 yaffs_GetCheckpointSum(dev,&checkpointSum);
4485 ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
4493 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4495 __u32 checkpointSum0;
4496 __u32 checkpointSum1;
4499 yaffs_GetCheckpointSum(dev,&checkpointSum0);
4501 ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4506 if(checkpointSum0 != checkpointSum1)
4513 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4518 if(dev->skipCheckpointWrite || !dev->isYaffs2){
4519 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
4524 ok = yaffs_CheckpointOpen(dev,1);
4527 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4528 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
4531 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
4532 ok = yaffs_WriteCheckpointDevice(dev);
4535 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
4536 ok = yaffs_WriteCheckpointObjects(dev);
4539 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4540 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
4544 ok = yaffs_WriteCheckpointSum(dev);
4548 if(!yaffs_CheckpointClose(dev))
4552 dev->isCheckpointed = 1;
4554 dev->isCheckpointed = 0;
4556 return dev->isCheckpointed;
4559 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4563 if(dev->skipCheckpointRead || !dev->isYaffs2){
4564 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
4569 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
4572 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4573 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
4576 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
4577 ok = yaffs_ReadCheckpointDevice(dev);
4580 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
4581 ok = yaffs_ReadCheckpointObjects(dev);
4584 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4585 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
4589 ok = yaffs_ReadCheckpointSum(dev);
4590 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
4593 if(!yaffs_CheckpointClose(dev))
4597 dev->isCheckpointed = 1;
4599 dev->isCheckpointed = 0;
4605 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4607 if(dev->isCheckpointed ||
4608 dev->blocksInCheckpoint > 0){
4609 dev->isCheckpointed = 0;
4610 yaffs_CheckpointInvalidateStream(dev);
4611 if(dev->superBlock && dev->markSuperBlockDirty)
4612 dev->markSuperBlockDirty(dev->superBlock);
4617 int yaffs_CheckpointSave(yaffs_Device *dev)
4620 T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4622 yaffs_VerifyObjects(dev);
4623 yaffs_VerifyBlocks(dev);
4624 yaffs_VerifyFreeChunks(dev);
4626 if(!dev->isCheckpointed) {
4627 yaffs_InvalidateCheckpoint(dev);
4628 yaffs_WriteCheckpointData(dev);
4631 T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4633 return dev->isCheckpointed;
4636 int yaffs_CheckpointRestore(yaffs_Device *dev)
4639 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4641 retval = yaffs_ReadCheckpointData(dev);
4643 if(dev->isCheckpointed){
4644 yaffs_VerifyObjects(dev);
4645 yaffs_VerifyBlocks(dev);
4646 yaffs_VerifyFreeChunks(dev);
4649 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4654 /*--------------------- File read/write ------------------------
4655 * Read and write have very similar structures.
4656 * In general the read/write has three parts to it
4657 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4658 * Some complete chunks
4659 * An incomplete chunk to end off with
4661 * Curve-balls: the first chunk might also be the last chunk.
4664 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
4673 yaffs_ChunkCache *cache;
4680 //chunk = offset / dev->nDataBytesPerChunk + 1;
4681 //start = offset % dev->nDataBytesPerChunk;
4682 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4685 /* OK now check for the curveball where the start and end are in
4688 if ((start + n) < dev->nDataBytesPerChunk) {
4691 nToCopy = dev->nDataBytesPerChunk - start;
4694 cache = yaffs_FindChunkCache(in, chunk);
4696 /* If the chunk is already in the cache or it is less than a whole chunk
4697 * or we're using inband tags then use the cache (if there is caching)
4698 * else bypass the cache.
4700 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4701 if (dev->nShortOpCaches > 0) {
4703 /* If we can't find the data in the cache, then load it up. */
4706 cache = yaffs_GrabChunkCache(in->myDev);
4708 cache->chunkId = chunk;
4711 yaffs_ReadChunkDataFromObject(in, chunk,
4717 yaffs_UseChunkCache(dev, cache, 0);
4721 #ifdef CONFIG_YAFFS_WINCE
4722 yfsd_UnlockYAFFS(TRUE);
4724 memcpy(buffer, &cache->data[start], nToCopy);
4726 #ifdef CONFIG_YAFFS_WINCE
4727 yfsd_LockYAFFS(TRUE);
4731 /* Read into the local buffer then copy..*/
4734 yaffs_GetTempBuffer(dev, __LINE__);
4735 yaffs_ReadChunkDataFromObject(in, chunk,
4737 #ifdef CONFIG_YAFFS_WINCE
4738 yfsd_UnlockYAFFS(TRUE);
4740 memcpy(buffer, &localBuffer[start], nToCopy);
4742 #ifdef CONFIG_YAFFS_WINCE
4743 yfsd_LockYAFFS(TRUE);
4745 yaffs_ReleaseTempBuffer(dev, localBuffer,
4750 #ifdef CONFIG_YAFFS_WINCE
4751 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4753 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4754 * This is because we otherwise screw up WinCE's memory mapper
4756 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
4758 #ifdef CONFIG_YAFFS_WINCE
4759 yfsd_UnlockYAFFS(TRUE);
4761 memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
4763 #ifdef CONFIG_YAFFS_WINCE
4764 yfsd_LockYAFFS(TRUE);
4765 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4769 /* A full chunk. Read directly into the supplied buffer. */
4770 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4784 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
4785 int nBytes, int writeThrough)
4794 int startOfWrite = offset;
4795 int chunkWritten = 0;
4802 while (n > 0 && chunkWritten >= 0) {
4803 //chunk = offset / dev->nDataBytesPerChunk + 1;
4804 //start = offset % dev->nDataBytesPerChunk;
4805 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4808 /* OK now check for the curveball where the start and end are in
4812 if ((start + n) < dev->nDataBytesPerChunk) {
4815 /* Now folks, to calculate how many bytes to write back....
4816 * If we're overwriting and not writing to then end of file then
4817 * we need to write back as much as was there before.
4821 in->variant.fileVariant.fileSize -
4822 ((chunk - 1) * dev->nDataBytesPerChunk);
4824 if (nBytesRead > dev->nDataBytesPerChunk) {
4825 nBytesRead = dev->nDataBytesPerChunk;
4830 (start + n)) ? nBytesRead : (start + n);
4833 nToCopy = dev->nDataBytesPerChunk - start;
4834 nToWriteBack = dev->nDataBytesPerChunk;
4837 if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4838 /* An incomplete start or end chunk (or maybe both start and end chunk),
4839 * or we're using inband tags, so we want to use the cache buffers.
4841 if (dev->nShortOpCaches > 0) {
4842 yaffs_ChunkCache *cache;
4843 /* If we can't find the data in the cache, then load the cache */
4844 cache = yaffs_FindChunkCache(in, chunk);
4847 && yaffs_CheckSpaceForAllocation(in->
4849 cache = yaffs_GrabChunkCache(in->myDev);
4851 cache->chunkId = chunk;
4854 yaffs_ReadChunkDataFromObject(in, chunk,
4860 !yaffs_CheckSpaceForAllocation(in->myDev)){
4861 /* Drop the cache if it was a read cache item and
4862 * no space check has been made for it.
4868 yaffs_UseChunkCache(dev, cache, 1);
4870 #ifdef CONFIG_YAFFS_WINCE
4871 yfsd_UnlockYAFFS(TRUE);
4874 memcpy(&cache->data[start], buffer,
4877 #ifdef CONFIG_YAFFS_WINCE
4878 yfsd_LockYAFFS(TRUE);
4881 cache->nBytes = nToWriteBack;
4885 yaffs_WriteChunkDataToObject
4888 cache->data, cache->nBytes,
4894 chunkWritten = -1; /* fail the write */
4897 /* An incomplete start or end chunk (or maybe both start and end chunk)
4898 * Read into the local buffer then copy, then copy over and write back.
4902 yaffs_GetTempBuffer(dev, __LINE__);
4904 yaffs_ReadChunkDataFromObject(in, chunk,
4907 #ifdef CONFIG_YAFFS_WINCE
4908 yfsd_UnlockYAFFS(TRUE);
4911 memcpy(&localBuffer[start], buffer, nToCopy);
4913 #ifdef CONFIG_YAFFS_WINCE
4914 yfsd_LockYAFFS(TRUE);
4917 yaffs_WriteChunkDataToObject(in, chunk,
4922 yaffs_ReleaseTempBuffer(dev, localBuffer,
4928 /* A full chunk. Write directly from the supplied buffer. */
4930 #ifdef CONFIG_YAFFS_WINCE
4931 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4932 * This is because we otherwise screw up WinCE's memory mapper
4934 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4935 #ifdef CONFIG_YAFFS_WINCE
4936 yfsd_UnlockYAFFS(TRUE);
4938 memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
4939 #ifdef CONFIG_YAFFS_WINCE
4940 yfsd_LockYAFFS(TRUE);
4943 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
4944 dev->nDataBytesPerChunk,
4946 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4950 yaffs_WriteChunkDataToObject(in, chunk, buffer,
4951 dev->nDataBytesPerChunk,
4954 /* Since we've overwritten the cached data, we better invalidate it. */
4955 yaffs_InvalidateChunkCache(in, chunk);
4958 if (chunkWritten >= 0) {
4967 /* Update file object */
4969 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
4970 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4979 /* ---------------------- File resizing stuff ------------------ */
4981 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
4984 yaffs_Device *dev = in->myDev;
4985 int oldFileSize = in->variant.fileVariant.fileSize;
4987 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4989 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4990 dev->nDataBytesPerChunk;
4994 /* Delete backwards so that we don't end up with holes if
4995 * power is lost part-way through the operation.
4997 for (i = lastDel; i >= startDel; i--) {
4998 /* NB this could be optimised somewhat,
4999 * eg. could retrieve the tags and write them without
5000 * using yaffs_DeleteChunk
5003 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5006 (dev->internalStartBlock * dev->nChunksPerBlock)
5008 ((dev->internalEndBlock +
5009 1) * dev->nChunksPerBlock)) {
5010 T(YAFFS_TRACE_ALWAYS,
5011 (TSTR("Found daft chunkId %d for %d" TENDSTR),
5015 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5022 int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
5025 int oldFileSize = in->variant.fileVariant.fileSize;
5026 __u32 newSizeOfPartialChunk;
5029 yaffs_Device *dev = in->myDev;
5031 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5033 yaffs_FlushFilesChunkCache(in);
5034 yaffs_InvalidateWholeChunkCache(in);
5036 yaffs_CheckGarbageCollection(dev);
5038 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
5042 if (newSize == oldFileSize) {
5046 if (newSize < oldFileSize) {
5048 yaffs_PruneResizedChunks(in, newSize);
5050 if (newSizeOfPartialChunk != 0) {
5051 int lastChunk = 1 + newFullChunks;
5053 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5055 /* Got to read and rewrite the last chunk with its new size and zero pad */
5056 yaffs_ReadChunkDataFromObject(in, lastChunk,
5059 memset(localBuffer + newSizeOfPartialChunk, 0,
5060 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5062 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5063 newSizeOfPartialChunk, 1);
5065 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5068 in->variant.fileVariant.fileSize = newSize;
5070 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5072 /* newsSize > oldFileSize */
5073 in->variant.fileVariant.fileSize = newSize;
5078 /* Write a new object header.
5079 * show we've shrunk the file, if need be
5080 * Do this only if the file is not in the deleted directories.
5082 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5083 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
5084 yaffs_UpdateObjectHeader(in, NULL, 0,
5085 (newSize < oldFileSize) ? 1 : 0, 0);
5091 loff_t yaffs_GetFileSize(yaffs_Object * obj)
5093 obj = yaffs_GetEquivalentObject(obj);
5095 switch (obj->variantType) {
5096 case YAFFS_OBJECT_TYPE_FILE:
5097 return obj->variant.fileVariant.fileSize;
5098 case YAFFS_OBJECT_TYPE_SYMLINK:
5099 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5107 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
5111 yaffs_FlushFilesChunkCache(in);
5113 #ifdef CONFIG_YAFFS_WINCE
5114 yfsd_WinFileTimeNow(in->win_mtime);
5117 in->yst_mtime = Y_CURRENT_TIME;
5123 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5124 0) ? YAFFS_OK : YAFFS_FAIL;
5133 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
5136 /* First off, invalidate the file's data in the cache, without flushing. */
5137 yaffs_InvalidateWholeChunkCache(in);
5139 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5140 /* Move to the unlinked directory so we have a record that it was deleted. */
5141 yaffs_ChangeObjectName(in, in->myDev->deletedDir,_Y("deleted"), 0, 0);
5145 yaffs_RemoveObjectFromDirectory(in);
5146 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
5149 yaffs_FreeObject(in);
5154 /* yaffs_DeleteFile deletes the whole file data
5155 * and the inode associated with the file.
5156 * It does not delete the links associated with the file.
5158 static int yaffs_UnlinkFile(yaffs_Object * in)
5162 int immediateDeletion = 0;
5167 immediateDeletion = 1;
5171 if (in->inUse <= 0) {
5172 immediateDeletion = 1;
5176 if (immediateDeletion) {
5178 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5179 _Y("deleted"), 0, 0);
5180 T(YAFFS_TRACE_TRACING,
5181 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5184 in->myDev->nDeletedFiles++;
5185 if (0 && in->myDev->isYaffs2) {
5186 yaffs_ResizeFile(in, 0);
5188 yaffs_SoftDeleteFile(in);
5191 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5192 _Y("unlinked"), 0, 0);
5199 int yaffs_DeleteFile(yaffs_Object * in)
5201 int retVal = YAFFS_OK;
5203 if (in->nDataChunks > 0) {
5204 /* Use soft deletion if there is data in the file */
5205 if (!in->unlinked) {
5206 retVal = yaffs_UnlinkFile(in);
5208 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5210 in->myDev->nDeletedFiles++;
5211 yaffs_SoftDeleteFile(in);
5213 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
5215 /* The file has no data chunks so we toss it immediately */
5216 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5217 in->variant.fileVariant.top = NULL;
5218 yaffs_DoGenericObjectDeletion(in);
5224 static int yaffs_DeleteDirectory(yaffs_Object * in)
5226 /* First check that the directory is empty. */
5227 if (ylist_empty(&in->variant.directoryVariant.children)) {
5228 return yaffs_DoGenericObjectDeletion(in);
5235 static int yaffs_DeleteSymLink(yaffs_Object * in)
5237 YFREE(in->variant.symLinkVariant.alias);
5239 return yaffs_DoGenericObjectDeletion(in);
5242 static int yaffs_DeleteHardLink(yaffs_Object * in)
5244 /* remove this hardlink from the list assocaited with the equivalent
5247 ylist_del(&in->hardLinks);
5248 return yaffs_DoGenericObjectDeletion(in);
5251 static void yaffs_DestroyObject(yaffs_Object * obj)
5253 switch (obj->variantType) {
5254 case YAFFS_OBJECT_TYPE_FILE:
5255 yaffs_DeleteFile(obj);
5257 case YAFFS_OBJECT_TYPE_DIRECTORY:
5258 yaffs_DeleteDirectory(obj);
5260 case YAFFS_OBJECT_TYPE_SYMLINK:
5261 yaffs_DeleteSymLink(obj);
5263 case YAFFS_OBJECT_TYPE_HARDLINK:
5264 yaffs_DeleteHardLink(obj);
5266 case YAFFS_OBJECT_TYPE_SPECIAL:
5267 yaffs_DoGenericObjectDeletion(obj);
5269 case YAFFS_OBJECT_TYPE_UNKNOWN:
5270 break; /* should not happen. */
5274 static int yaffs_UnlinkWorker(yaffs_Object * obj)
5277 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5278 return yaffs_DeleteHardLink(obj);
5279 } else if (!ylist_empty(&obj->hardLinks)) {
5280 /* Curve ball: We're unlinking an object that has a hardlink.
5282 * This problem arises because we are not strictly following
5283 * The Linux link/inode model.
5285 * We can't really delete the object.
5286 * Instead, we do the following:
5287 * - Select a hardlink.
5288 * - Unhook it from the hard links
5289 * - Unhook it from its parent directory (so that the rename can work)
5290 * - Rename the object to the hardlink's name.
5291 * - Delete the hardlink
5296 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5298 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5300 ylist_del_init(&hl->hardLinks);
5301 ylist_del_init(&hl->siblings);
5303 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5305 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5307 if (retVal == YAFFS_OK) {
5308 retVal = yaffs_DoGenericObjectDeletion(hl);
5313 switch (obj->variantType) {
5314 case YAFFS_OBJECT_TYPE_FILE:
5315 return yaffs_UnlinkFile(obj);
5317 case YAFFS_OBJECT_TYPE_DIRECTORY:
5318 return yaffs_DeleteDirectory(obj);
5320 case YAFFS_OBJECT_TYPE_SYMLINK:
5321 return yaffs_DeleteSymLink(obj);
5323 case YAFFS_OBJECT_TYPE_SPECIAL:
5324 return yaffs_DoGenericObjectDeletion(obj);
5326 case YAFFS_OBJECT_TYPE_HARDLINK:
5327 case YAFFS_OBJECT_TYPE_UNKNOWN:
5335 static int yaffs_UnlinkObject( yaffs_Object *obj)
5338 if (obj && obj->unlinkAllowed) {
5339 return yaffs_UnlinkWorker(obj);
5345 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
5349 obj = yaffs_FindObjectByName(dir, name);
5350 return yaffs_UnlinkObject(obj);
5353 /*----------------------- Initialisation Scanning ---------------------- */
5355 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
5356 int backwardScanning)
5360 if (!backwardScanning) {
5361 /* Handle YAFFS1 forward scanning case
5362 * For YAFFS1 we always do the deletion
5366 /* Handle YAFFS2 case (backward scanning)
5367 * If the shadowed object exists then ignore.
5369 if (yaffs_FindObjectByNumber(dev, objId)) {
5374 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5375 * We put it in unlinked dir to be cleaned up after the scanning
5378 yaffs_FindOrCreateObjectByNumber(dev, objId,
5379 YAFFS_OBJECT_TYPE_FILE);
5380 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5381 obj->variant.fileVariant.shrinkSize = 0;
5382 obj->valid = 1; /* So that we don't read any other info for this file */
5392 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5399 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5401 in = yaffs_FindObjectByNumber(dev,
5402 hl->variant.hardLinkVariant.
5403 equivalentObjectId);
5406 /* Add the hardlink pointers */
5407 hl->variant.hardLinkVariant.equivalentObject = in;
5408 ylist_add(&hl->hardLinks, &in->hardLinks);
5410 /* Todo Need to report/handle this better.
5411 * Got a problem... hardlink to a non-existant object
5413 hl->variant.hardLinkVariant.equivalentObject = NULL;
5414 YINIT_LIST_HEAD(&hl->hardLinks);
5426 static int ybicmp(const void *a, const void *b){
5427 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5428 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5429 register int ablock = ((yaffs_BlockIndex *)a)->block;
5430 register int bblock = ((yaffs_BlockIndex *)b)->block;
5432 return ablock - bblock;
5438 static int yaffs_Scan(yaffs_Device * dev)
5440 yaffs_ExtendedTags tags;
5445 int nBlocksToScan = 0;
5451 yaffs_BlockState state;
5452 yaffs_Object *hardList = NULL;
5453 yaffs_BlockInfo *bi;
5454 __u32 sequenceNumber;
5455 yaffs_ObjectHeader *oh;
5457 yaffs_Object *parent;
5458 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5460 int alloc_failed = 0;
5465 yaffs_BlockIndex *blockIndex = NULL;
5467 if (dev->isYaffs2) {
5469 (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
5473 //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
5476 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5477 dev->internalStartBlock, dev->internalEndBlock));
5479 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5481 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5483 if (dev->isYaffs2) {
5484 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5489 /* Scan all the blocks to determine their state */
5490 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5491 bi = yaffs_GetBlockInfo(dev, blk);
5492 yaffs_ClearChunkBits(dev, blk);
5494 bi->softDeletions = 0;
5496 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5498 bi->blockState = state;
5499 bi->sequenceNumber = sequenceNumber;
5501 T(YAFFS_TRACE_SCAN_DEBUG,
5502 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5503 state, sequenceNumber));
5505 if (state == YAFFS_BLOCK_STATE_DEAD) {
5506 T(YAFFS_TRACE_BAD_BLOCKS,
5507 (TSTR("block %d is bad" TENDSTR), blk));
5508 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5509 T(YAFFS_TRACE_SCAN_DEBUG,
5510 (TSTR("Block empty " TENDSTR)));
5511 dev->nErasedBlocks++;
5512 dev->nFreeChunks += dev->nChunksPerBlock;
5513 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5515 /* Determine the highest sequence number */
5516 if (dev->isYaffs2 &&
5517 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5518 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5520 blockIndex[nBlocksToScan].seq = sequenceNumber;
5521 blockIndex[nBlocksToScan].block = blk;
5525 if (sequenceNumber >= dev->sequenceNumber) {
5526 dev->sequenceNumber = sequenceNumber;
5528 } else if (dev->isYaffs2) {
5529 /* TODO: Nasty sequence number! */
5532 ("Block scanning block %d has bad sequence number %d"
5533 TENDSTR), blk, sequenceNumber));
5540 * Dungy old bubble sort for now...
5542 if (dev->isYaffs2) {
5543 yaffs_BlockIndex temp;
5547 for (i = 0; i < nBlocksToScan; i++)
5548 for (j = i + 1; j < nBlocksToScan; j++)
5549 if (blockIndex[i].seq > blockIndex[j].seq) {
5550 temp = blockIndex[j];
5551 blockIndex[j] = blockIndex[i];
5552 blockIndex[i] = temp;
5556 /* Now scan the blocks looking at the data. */
5557 if (dev->isYaffs2) {
5559 endIterator = nBlocksToScan - 1;
5560 T(YAFFS_TRACE_SCAN_DEBUG,
5561 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5563 startIterator = dev->internalStartBlock;
5564 endIterator = dev->internalEndBlock;
5567 /* For each block.... */
5568 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5573 if (dev->isYaffs2) {
5574 /* get the block to scan in the correct order */
5575 blk = blockIndex[blockIterator].block;
5577 blk = blockIterator;
5580 bi = yaffs_GetBlockInfo(dev, blk);
5581 state = bi->blockState;
5585 /* For each chunk in each block that needs scanning....*/
5586 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5587 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5588 /* Read the tags and decide what to do */
5589 chunk = blk * dev->nChunksPerBlock + c;
5591 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5594 /* Let's have a good look at this chunk... */
5596 if (!dev->isYaffs2 && tags.chunkDeleted) {
5602 /*T((" %d %d deleted\n",blk,c)); */
5603 } else if (!tags.chunkUsed) {
5604 /* An unassigned chunk in the block
5605 * This means that either the block is empty or
5606 * this is the one being allocated from
5610 /* We're looking at the first chunk in the block so the block is unused */
5611 state = YAFFS_BLOCK_STATE_EMPTY;
5612 dev->nErasedBlocks++;
5614 /* this is the block being allocated from */
5617 (" Allocating from %d %d" TENDSTR),
5619 state = YAFFS_BLOCK_STATE_ALLOCATING;
5620 dev->allocationBlock = blk;
5621 dev->allocationPage = c;
5622 dev->allocationBlockFinder = blk;
5623 /* Set it to here to encourage the allocator to go forth from here. */
5625 /* Yaffs2 sanity check:
5626 * This should be the one with the highest sequence number
5629 && (dev->sequenceNumber !=
5630 bi->sequenceNumber)) {
5631 T(YAFFS_TRACE_ALWAYS,
5633 ("yaffs: Allocation block %d was not highest sequence id: block seq = %d, dev seq = %d"
5634 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
5638 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5639 } else if (tags.chunkId > 0) {
5640 /* chunkId > 0 so it is a data chunk... */
5641 unsigned int endpos;
5643 yaffs_SetChunkBit(dev, blk, c);
5646 in = yaffs_FindOrCreateObjectByNumber(dev,
5649 YAFFS_OBJECT_TYPE_FILE);
5650 /* PutChunkIntoFile checks for a clash (two data chunks with
5651 * the same chunkId).
5658 if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
5663 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5666 in->variantType == YAFFS_OBJECT_TYPE_FILE
5667 && in->variant.fileVariant.scannedFileSize <
5669 in->variant.fileVariant.
5670 scannedFileSize = endpos;
5671 if (!dev->useHeaderFileSize) {
5672 in->variant.fileVariant.
5674 in->variant.fileVariant.
5679 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5681 /* chunkId == 0, so it is an ObjectHeader.
5682 * Thus, we read in the object header and make the object
5684 yaffs_SetChunkBit(dev, blk, c);
5687 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5691 oh = (yaffs_ObjectHeader *) chunkData;
5693 in = yaffs_FindObjectByNumber(dev,
5695 if (in && in->variantType != oh->type) {
5696 /* This should not happen, but somehow
5697 * Wev'e ended up with an objectId that has been reused but not yet
5698 * deleted, and worse still it has changed type. Delete the old object.
5701 yaffs_DestroyObject(in);
5706 in = yaffs_FindOrCreateObjectByNumber(dev,
5714 if (in && oh->shadowsObject > 0) {
5715 yaffs_HandleShadowedObject(dev,
5721 if (in && in->valid) {
5722 /* We have already filled this one. We have a duplicate and need to resolve it. */
5724 unsigned existingSerial = in->serial;
5725 unsigned newSerial = tags.serialNumber;
5727 if (dev->isYaffs2 ||
5728 ((existingSerial + 1) & 3) ==
5730 /* Use new one - destroy the exisiting one */
5731 yaffs_DeleteChunk(dev,
5736 /* Use existing - destroy this one. */
5737 yaffs_DeleteChunk(dev, chunk, 1,
5742 if (in && !in->valid &&
5743 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5744 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5745 /* We only load some info, don't fiddle with directory structure */
5747 in->variantType = oh->type;
5749 in->yst_mode = oh->yst_mode;
5750 #ifdef CONFIG_YAFFS_WINCE
5751 in->win_atime[0] = oh->win_atime[0];
5752 in->win_ctime[0] = oh->win_ctime[0];
5753 in->win_mtime[0] = oh->win_mtime[0];
5754 in->win_atime[1] = oh->win_atime[1];
5755 in->win_ctime[1] = oh->win_ctime[1];
5756 in->win_mtime[1] = oh->win_mtime[1];
5758 in->yst_uid = oh->yst_uid;
5759 in->yst_gid = oh->yst_gid;
5760 in->yst_atime = oh->yst_atime;
5761 in->yst_mtime = oh->yst_mtime;
5762 in->yst_ctime = oh->yst_ctime;
5763 in->yst_rdev = oh->yst_rdev;
5765 in->chunkId = chunk;
5767 } else if (in && !in->valid) {
5768 /* we need to load this info */
5771 in->variantType = oh->type;
5773 in->yst_mode = oh->yst_mode;
5774 #ifdef CONFIG_YAFFS_WINCE
5775 in->win_atime[0] = oh->win_atime[0];
5776 in->win_ctime[0] = oh->win_ctime[0];
5777 in->win_mtime[0] = oh->win_mtime[0];
5778 in->win_atime[1] = oh->win_atime[1];
5779 in->win_ctime[1] = oh->win_ctime[1];
5780 in->win_mtime[1] = oh->win_mtime[1];
5782 in->yst_uid = oh->yst_uid;
5783 in->yst_gid = oh->yst_gid;
5784 in->yst_atime = oh->yst_atime;
5785 in->yst_mtime = oh->yst_mtime;
5786 in->yst_ctime = oh->yst_ctime;
5787 in->yst_rdev = oh->yst_rdev;
5789 in->chunkId = chunk;
5791 yaffs_SetObjectName(in, oh->name);
5794 /* directory stuff...
5799 yaffs_FindOrCreateObjectByNumber
5800 (dev, oh->parentObjectId,
5801 YAFFS_OBJECT_TYPE_DIRECTORY);
5802 if (parent->variantType ==
5803 YAFFS_OBJECT_TYPE_UNKNOWN) {
5804 /* Set up as a directory */
5805 parent->variantType =
5806 YAFFS_OBJECT_TYPE_DIRECTORY;
5807 YINIT_LIST_HEAD(&parent->variant.
5810 } else if (parent->variantType !=
5811 YAFFS_OBJECT_TYPE_DIRECTORY)
5813 /* Hoosterman, another problem....
5814 * We're trying to use a non-directory as a directory
5817 T(YAFFS_TRACE_ERROR,
5819 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
5821 parent = dev->lostNFoundDir;
5824 yaffs_AddObjectToDirectory(parent, in);
5826 if (0 && (parent == dev->deletedDir ||
5827 parent == dev->unlinkedDir)) {
5828 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
5829 dev->nDeletedFiles++;
5831 /* Note re hardlinks.
5832 * Since we might scan a hardlink before its equivalent object is scanned
5833 * we put them all in a list.
5834 * After scanning is complete, we should have all the objects, so we run through this
5835 * list and fix up all the chains.
5838 switch (in->variantType) {
5839 case YAFFS_OBJECT_TYPE_UNKNOWN:
5840 /* Todo got a problem */
5842 case YAFFS_OBJECT_TYPE_FILE:
5845 /* Prune back the shrunken chunks */
5846 yaffs_PruneResizedChunks
5848 /* Mark the block as having a shrinkHeader */
5849 bi->hasShrinkHeader = 1;
5852 if (dev->useHeaderFileSize)
5854 in->variant.fileVariant.
5859 case YAFFS_OBJECT_TYPE_HARDLINK:
5860 in->variant.hardLinkVariant.
5861 equivalentObjectId =
5862 oh->equivalentObjectId;
5863 in->hardLinks.next =
5864 (struct ylist_head *)
5868 case YAFFS_OBJECT_TYPE_DIRECTORY:
5871 case YAFFS_OBJECT_TYPE_SPECIAL:
5874 case YAFFS_OBJECT_TYPE_SYMLINK:
5875 in->variant.symLinkVariant.alias =
5876 yaffs_CloneString(oh->alias);
5877 if(!in->variant.symLinkVariant.alias)
5882 if (parent == dev->deletedDir) {
5883 yaffs_DestroyObject(in);
5884 bi->hasShrinkHeader = 1;
5890 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5891 /* If we got this far while scanning, then the block is fully allocated.*/
5892 state = YAFFS_BLOCK_STATE_FULL;
5895 bi->blockState = state;
5897 /* Now let's see if it was dirty */
5898 if (bi->pagesInUse == 0 &&
5899 !bi->hasShrinkHeader &&
5900 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5901 yaffs_BlockBecameDirty(dev, blk);
5911 /* Ok, we've done all the scanning.
5912 * Fix up the hard link chains.
5913 * We should now have scanned all the objects, now it's time to add these
5917 yaffs_HardlinkFixup(dev,hardList);
5919 /* Handle the unlinked files. Since they were left in an unlinked state we should
5923 struct ylist_head *i;
5924 struct ylist_head *n;
5927 /* Soft delete all the unlinked files */
5928 ylist_for_each_safe(i, n,
5929 &dev->unlinkedDir->variant.directoryVariant.
5932 l = ylist_entry(i, yaffs_Object, siblings);
5933 yaffs_DestroyObject(l);
5938 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5944 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5950 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5953 yaffs_ObjectHeader *oh;
5954 yaffs_Device *dev = in->myDev;
5955 yaffs_ExtendedTags tags;
5957 int alloc_failed = 0;
5963 T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
5965 in->lazyLoaded ? "not yet" : "already"));
5970 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5972 result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
5973 oh = (yaffs_ObjectHeader *) chunkData;
5975 in->yst_mode = oh->yst_mode;
5976 #ifdef CONFIG_YAFFS_WINCE
5977 in->win_atime[0] = oh->win_atime[0];
5978 in->win_ctime[0] = oh->win_ctime[0];
5979 in->win_mtime[0] = oh->win_mtime[0];
5980 in->win_atime[1] = oh->win_atime[1];
5981 in->win_ctime[1] = oh->win_ctime[1];
5982 in->win_mtime[1] = oh->win_mtime[1];
5984 in->yst_uid = oh->yst_uid;
5985 in->yst_gid = oh->yst_gid;
5986 in->yst_atime = oh->yst_atime;
5987 in->yst_mtime = oh->yst_mtime;
5988 in->yst_ctime = oh->yst_ctime;
5989 in->yst_rdev = oh->yst_rdev;
5992 yaffs_SetObjectName(in, oh->name);
5994 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
5995 in->variant.symLinkVariant.alias =
5996 yaffs_CloneString(oh->alias);
5997 if(!in->variant.symLinkVariant.alias)
5998 alloc_failed = 1; /* Not returned to caller */
6001 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
6005 static int yaffs_ScanBackwards(yaffs_Device * dev)
6007 yaffs_ExtendedTags tags;
6012 int nBlocksToScan = 0;
6018 yaffs_BlockState state;
6019 yaffs_Object *hardList = NULL;
6020 yaffs_BlockInfo *bi;
6021 __u32 sequenceNumber;
6022 yaffs_ObjectHeader *oh;
6024 yaffs_Object *parent;
6025 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6031 int foundChunksInBlock;
6032 int equivalentObjectId;
6033 int alloc_failed = 0;
6036 yaffs_BlockIndex *blockIndex = NULL;
6037 int altBlockIndex = 0;
6039 if (!dev->isYaffs2) {
6041 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6047 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
6048 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6051 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6053 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6056 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6062 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6066 dev->blocksInCheckpoint = 0;
6068 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6070 /* Scan all the blocks to determine their state */
6071 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6072 bi = yaffs_GetBlockInfo(dev, blk);
6073 yaffs_ClearChunkBits(dev, blk);
6075 bi->softDeletions = 0;
6077 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6079 bi->blockState = state;
6080 bi->sequenceNumber = sequenceNumber;
6082 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6083 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6085 T(YAFFS_TRACE_SCAN_DEBUG,
6086 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6087 state, sequenceNumber));
6090 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
6091 dev->blocksInCheckpoint++;
6093 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6094 T(YAFFS_TRACE_BAD_BLOCKS,
6095 (TSTR("block %d is bad" TENDSTR), blk));
6096 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6097 T(YAFFS_TRACE_SCAN_DEBUG,
6098 (TSTR("Block empty " TENDSTR)));
6099 dev->nErasedBlocks++;
6100 dev->nFreeChunks += dev->nChunksPerBlock;
6101 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6103 /* Determine the highest sequence number */
6104 if (dev->isYaffs2 &&
6105 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6106 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6108 blockIndex[nBlocksToScan].seq = sequenceNumber;
6109 blockIndex[nBlocksToScan].block = blk;
6113 if (sequenceNumber >= dev->sequenceNumber) {
6114 dev->sequenceNumber = sequenceNumber;
6116 } else if (dev->isYaffs2) {
6117 /* TODO: Nasty sequence number! */
6120 ("Block scanning block %d has bad sequence number %d"
6121 TENDSTR), blk, sequenceNumber));
6128 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6134 /* Sort the blocks */
6135 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6137 /* Use qsort now. */
6138 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6142 /* Dungy old bubble sort... */
6144 yaffs_BlockIndex temp;
6148 for (i = 0; i < nBlocksToScan; i++)
6149 for (j = i + 1; j < nBlocksToScan; j++)
6150 if (blockIndex[i].seq > blockIndex[j].seq) {
6151 temp = blockIndex[j];
6152 blockIndex[j] = blockIndex[i];
6153 blockIndex[i] = temp;
6160 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6162 /* Now scan the blocks looking at the data. */
6164 endIterator = nBlocksToScan - 1;
6165 T(YAFFS_TRACE_SCAN_DEBUG,
6166 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6168 /* For each block.... backwards */
6169 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6171 /* Cooperative multitasking! This loop can run for so
6172 long that watchdog timers expire. */
6175 /* get the block to scan in the correct order */
6176 blk = blockIndex[blockIterator].block;
6178 bi = yaffs_GetBlockInfo(dev, blk);
6181 state = bi->blockState;
6185 /* For each chunk in each block that needs scanning.... */
6186 foundChunksInBlock = 0;
6187 for (c = dev->nChunksPerBlock - 1;
6188 !alloc_failed && c >= 0 &&
6189 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6190 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6191 /* Scan backwards...
6192 * Read the tags and decide what to do
6195 chunk = blk * dev->nChunksPerBlock + c;
6197 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6200 /* Let's have a good look at this chunk... */
6202 if (!tags.chunkUsed) {
6203 /* An unassigned chunk in the block.
6204 * If there are used chunks after this one, then
6205 * it is a chunk that was skipped due to failing the erased
6206 * check. Just skip it so that it can be deleted.
6207 * But, more typically, We get here when this is an unallocated
6208 * chunk and his means that either the block is empty or
6209 * this is the one being allocated from
6212 if(foundChunksInBlock)
6214 /* This is a chunk that was skipped due to failing the erased check */
6216 } else if (c == 0) {
6217 /* We're looking at the first chunk in the block so the block is unused */
6218 state = YAFFS_BLOCK_STATE_EMPTY;
6219 dev->nErasedBlocks++;
6221 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6222 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6223 if(dev->sequenceNumber == bi->sequenceNumber) {
6224 /* this is the block being allocated from */
6228 (" Allocating from %d %d"
6231 state = YAFFS_BLOCK_STATE_ALLOCATING;
6232 dev->allocationBlock = blk;
6233 dev->allocationPage = c;
6234 dev->allocationBlockFinder = blk;
6237 /* This is a partially written block that is not
6238 * the current allocation block. This block must have
6239 * had a write failure, so set up for retirement.
6242 bi->needsRetiring = 1;
6243 bi->gcPrioritise = 1;
6245 T(YAFFS_TRACE_ALWAYS,
6246 (TSTR("Partially written block %d being set for retirement" TENDSTR),
6256 } else if (tags.chunkId > 0) {
6257 /* chunkId > 0 so it is a data chunk... */
6258 unsigned int endpos;
6260 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6262 foundChunksInBlock = 1;
6265 yaffs_SetChunkBit(dev, blk, c);
6268 in = yaffs_FindOrCreateObjectByNumber(dev,
6271 YAFFS_OBJECT_TYPE_FILE);
6278 in->variantType == YAFFS_OBJECT_TYPE_FILE
6280 in->variant.fileVariant.shrinkSize) {
6281 /* This has not been invalidated by a resize */
6282 if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
6287 /* File size is calculated by looking at the data chunks if we have not
6288 * seen an object header yet. Stop this practice once we find an object header.
6292 1) * dev->nDataBytesPerChunk +
6295 if (!in->valid && /* have not got an object header yet */
6296 in->variant.fileVariant.
6297 scannedFileSize < endpos) {
6298 in->variant.fileVariant.
6299 scannedFileSize = endpos;
6300 in->variant.fileVariant.
6302 in->variant.fileVariant.
6307 /* This chunk has been invalidated by a resize, so delete */
6308 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6312 /* chunkId == 0, so it is an ObjectHeader.
6313 * Thus, we read in the object header and make the object
6315 foundChunksInBlock = 1;
6317 yaffs_SetChunkBit(dev, blk, c);
6323 if (tags.extraHeaderInfoAvailable) {
6324 in = yaffs_FindOrCreateObjectByNumber
6325 (dev, tags.objectId,
6326 tags.extraObjectType);
6330 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6333 tags.extraShadows ||
6335 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6336 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
6339 /* If we don't have valid info then we need to read the chunk
6340 * TODO In future we can probably defer reading the chunk and
6341 * living with invalid data until needed.
6344 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6349 oh = (yaffs_ObjectHeader *) chunkData;
6351 if(dev->inbandTags){
6352 /* Fix up the header if they got corrupted by inband tags */
6353 oh->shadowsObject = oh->inbandShadowsObject;
6354 oh->isShrink = oh->inbandIsShrink;
6358 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6363 /* TODO Hoosterman we have a problem! */
6364 T(YAFFS_TRACE_ERROR,
6366 ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
6367 TENDSTR), tags.objectId, chunk));
6372 /* We have already filled this one.
6373 * We have a duplicate that will be discarded, but
6374 * we first have to suck out resize info if it is a file.
6377 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6379 oh-> type == YAFFS_OBJECT_TYPE_FILE)||
6380 (tags.extraHeaderInfoAvailable &&
6381 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
6384 (oh) ? oh->fileSize : tags.
6386 __u32 parentObjectId =
6388 parentObjectId : tags.
6389 extraParentObjectId;
6391 (oh) ? oh->isShrink : tags.
6392 extraIsShrinkHeader;
6394 /* If it is deleted (unlinked at start also means deleted)
6395 * we treat the file size as being zeroed at this point.
6397 if (parentObjectId ==
6398 YAFFS_OBJECTID_DELETED
6399 || parentObjectId ==
6400 YAFFS_OBJECTID_UNLINKED) {
6406 in->variant.fileVariant.
6407 shrinkSize > thisSize) {
6408 in->variant.fileVariant.
6414 bi->hasShrinkHeader = 1;
6418 /* Use existing - destroy this one. */
6419 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6424 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6426 YAFFS_OBJECTID_LOSTNFOUND)) {
6427 /* We only load some info, don't fiddle with directory structure */
6431 in->variantType = oh->type;
6433 in->yst_mode = oh->yst_mode;
6434 #ifdef CONFIG_YAFFS_WINCE
6435 in->win_atime[0] = oh->win_atime[0];
6436 in->win_ctime[0] = oh->win_ctime[0];
6437 in->win_mtime[0] = oh->win_mtime[0];
6438 in->win_atime[1] = oh->win_atime[1];
6439 in->win_ctime[1] = oh->win_ctime[1];
6440 in->win_mtime[1] = oh->win_mtime[1];
6442 in->yst_uid = oh->yst_uid;
6443 in->yst_gid = oh->yst_gid;
6444 in->yst_atime = oh->yst_atime;
6445 in->yst_mtime = oh->yst_mtime;
6446 in->yst_ctime = oh->yst_ctime;
6447 in->yst_rdev = oh->yst_rdev;
6451 in->variantType = tags.extraObjectType;
6455 in->chunkId = chunk;
6457 } else if (!in->valid) {
6458 /* we need to load this info */
6461 in->chunkId = chunk;
6464 in->variantType = oh->type;
6466 in->yst_mode = oh->yst_mode;
6467 #ifdef CONFIG_YAFFS_WINCE
6468 in->win_atime[0] = oh->win_atime[0];
6469 in->win_ctime[0] = oh->win_ctime[0];
6470 in->win_mtime[0] = oh->win_mtime[0];
6471 in->win_atime[1] = oh->win_atime[1];
6472 in->win_ctime[1] = oh->win_ctime[1];
6473 in->win_mtime[1] = oh->win_mtime[1];
6475 in->yst_uid = oh->yst_uid;
6476 in->yst_gid = oh->yst_gid;
6477 in->yst_atime = oh->yst_atime;
6478 in->yst_mtime = oh->yst_mtime;
6479 in->yst_ctime = oh->yst_ctime;
6480 in->yst_rdev = oh->yst_rdev;
6483 if (oh->shadowsObject > 0)
6484 yaffs_HandleShadowedObject(dev,
6490 yaffs_SetObjectName(in, oh->name);
6492 yaffs_FindOrCreateObjectByNumber
6493 (dev, oh->parentObjectId,
6494 YAFFS_OBJECT_TYPE_DIRECTORY);
6496 fileSize = oh->fileSize;
6497 isShrink = oh->isShrink;
6498 equivalentObjectId = oh->equivalentObjectId;
6502 in->variantType = tags.extraObjectType;
6504 yaffs_FindOrCreateObjectByNumber
6505 (dev, tags.extraParentObjectId,
6506 YAFFS_OBJECT_TYPE_DIRECTORY);
6507 fileSize = tags.extraFileLength;
6508 isShrink = tags.extraIsShrinkHeader;
6509 equivalentObjectId = tags.extraEquivalentObjectId;
6515 /* directory stuff...
6519 if (parent->variantType ==
6520 YAFFS_OBJECT_TYPE_UNKNOWN) {
6521 /* Set up as a directory */
6522 parent->variantType =
6523 YAFFS_OBJECT_TYPE_DIRECTORY;
6524 YINIT_LIST_HEAD(&parent->variant.
6527 } else if (parent->variantType !=
6528 YAFFS_OBJECT_TYPE_DIRECTORY)
6530 /* Hoosterman, another problem....
6531 * We're trying to use a non-directory as a directory
6534 T(YAFFS_TRACE_ERROR,
6536 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6538 parent = dev->lostNFoundDir;
6541 yaffs_AddObjectToDirectory(parent, in);
6543 itsUnlinked = (parent == dev->deletedDir) ||
6544 (parent == dev->unlinkedDir);
6547 /* Mark the block as having a shrinkHeader */
6548 bi->hasShrinkHeader = 1;
6551 /* Note re hardlinks.
6552 * Since we might scan a hardlink before its equivalent object is scanned
6553 * we put them all in a list.
6554 * After scanning is complete, we should have all the objects, so we run
6555 * through this list and fix up all the chains.
6558 switch (in->variantType) {
6559 case YAFFS_OBJECT_TYPE_UNKNOWN:
6560 /* Todo got a problem */
6562 case YAFFS_OBJECT_TYPE_FILE:
6564 if (in->variant.fileVariant.
6565 scannedFileSize < fileSize) {
6566 /* This covers the case where the file size is greater
6567 * than where the data is
6568 * This will happen if the file is resized to be larger
6569 * than its current data extents.
6571 in->variant.fileVariant.fileSize = fileSize;
6572 in->variant.fileVariant.scannedFileSize =
6573 in->variant.fileVariant.fileSize;
6577 in->variant.fileVariant.shrinkSize > fileSize) {
6578 in->variant.fileVariant.shrinkSize = fileSize;
6582 case YAFFS_OBJECT_TYPE_HARDLINK:
6584 in->variant.hardLinkVariant.equivalentObjectId =
6586 in->hardLinks.next =
6587 (struct ylist_head *) hardList;
6591 case YAFFS_OBJECT_TYPE_DIRECTORY:
6594 case YAFFS_OBJECT_TYPE_SPECIAL:
6597 case YAFFS_OBJECT_TYPE_SYMLINK:
6599 in->variant.symLinkVariant.alias =
6600 yaffs_CloneString(oh->
6602 if(!in->variant.symLinkVariant.alias)
6612 } /* End of scanning for each chunk */
6614 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6615 /* If we got this far while scanning, then the block is fully allocated. */
6616 state = YAFFS_BLOCK_STATE_FULL;
6619 bi->blockState = state;
6621 /* Now let's see if it was dirty */
6622 if (bi->pagesInUse == 0 &&
6623 !bi->hasShrinkHeader &&
6624 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6625 yaffs_BlockBecameDirty(dev, blk);
6631 YFREE_ALT(blockIndex);
6635 /* Ok, we've done all the scanning.
6636 * Fix up the hard link chains.
6637 * We should now have scanned all the objects, now it's time to add these
6640 yaffs_HardlinkFixup(dev,hardList);
6644 * Sort out state of unlinked and deleted objects.
6647 struct ylist_head *i;
6648 struct ylist_head *n;
6652 /* Soft delete all the unlinked files */
6653 ylist_for_each_safe(i, n,
6654 &dev->unlinkedDir->variant.directoryVariant.
6657 l = ylist_entry(i, yaffs_Object, siblings);
6658 yaffs_DestroyObject(l);
6662 /* Soft delete all the deletedDir files */
6663 ylist_for_each_safe(i, n,
6664 &dev->deletedDir->variant.directoryVariant.
6667 l = ylist_entry(i, yaffs_Object, siblings);
6668 yaffs_DestroyObject(l);
6674 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6680 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6685 /*------------------------------ Directory Functions ----------------------------- */
6687 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
6689 yaffs_Device *dev = obj->myDev;
6691 if(dev && dev->removeObjectCallback)
6692 dev->removeObjectCallback(obj);
6694 ylist_del_init(&obj->siblings);
6699 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
6704 T(YAFFS_TRACE_ALWAYS,
6706 ("tragedy: Trying to add an object to a null pointer directory"
6710 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6711 T(YAFFS_TRACE_ALWAYS,
6713 ("tragedy: Trying to add an object to a non-directory"
6718 if (obj->siblings.prev == NULL) {
6719 /* Not initialised */
6720 YINIT_LIST_HEAD(&obj->siblings);
6722 } else if (!ylist_empty(&obj->siblings)) {
6723 /* If it is holed up somewhere else, un hook it */
6724 yaffs_RemoveObjectFromDirectory(obj);
6727 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
6728 obj->parent = directory;
6730 if (directory == obj->myDev->unlinkedDir
6731 || directory == obj->myDev->deletedDir) {
6733 obj->myDev->nUnlinkedFiles++;
6734 obj->renameAllowed = 0;
6738 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
6743 struct ylist_head *i;
6744 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6753 T(YAFFS_TRACE_ALWAYS,
6755 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6759 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6760 T(YAFFS_TRACE_ALWAYS,
6762 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6766 sum = yaffs_CalcNameSum(name);
6768 ylist_for_each(i, &directory->variant.directoryVariant.children) {
6770 l = ylist_entry(i, yaffs_Object, siblings);
6772 yaffs_CheckObjectDetailsLoaded(l);
6774 /* Special case for lost-n-found */
6775 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6776 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
6779 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
6781 /* LostnFound cunk called Objxxx
6784 yaffs_GetObjectName(l, buffer,
6785 YAFFS_MAX_NAME_LENGTH);
6786 if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
6799 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
6800 int (*fn) (yaffs_Object *))
6802 struct ylist_head *i;
6806 T(YAFFS_TRACE_ALWAYS,
6808 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6812 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6813 T(YAFFS_TRACE_ALWAYS,
6815 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6819 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
6821 l = ylist_entry(i, yaffs_Object, siblings);
6833 /* GetEquivalentObject dereferences any hard links to get to the
6837 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
6839 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6840 /* We want the object id of the equivalent object, not this one */
6841 obj = obj->variant.hardLinkVariant.equivalentObject;
6842 yaffs_CheckObjectDetailsLoaded(obj);
6848 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
6850 memset(name, 0, buffSize * sizeof(YCHAR));
6852 yaffs_CheckObjectDetailsLoaded(obj);
6854 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6855 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6856 } else if (obj->chunkId <= 0) {
6858 /* make up a name */
6859 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
6861 yaffs_strncpy(name, locName, buffSize - 1);
6864 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6865 else if (obj->shortName[0]) {
6866 yaffs_strcpy(name, obj->shortName);
6871 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6873 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6875 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6877 if (obj->chunkId >= 0) {
6878 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6879 obj->chunkId, buffer,
6882 yaffs_strncpy(name, oh->name, buffSize - 1);
6884 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6887 return yaffs_strlen(name);
6890 int yaffs_GetObjectFileLength(yaffs_Object * obj)
6893 /* Dereference any hard linking */
6894 obj = yaffs_GetEquivalentObject(obj);
6896 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
6897 return obj->variant.fileVariant.fileSize;
6899 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6900 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6902 /* Only a directory should drop through to here */
6903 return obj->myDev->nDataBytesPerChunk;
6907 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
6910 struct ylist_head *i;
6912 if (!obj->unlinked) {
6913 count++; /* the object itself */
6915 ylist_for_each(i, &obj->hardLinks) {
6916 count++; /* add the hard links; */
6922 int yaffs_GetObjectInode(yaffs_Object * obj)
6924 obj = yaffs_GetEquivalentObject(obj);
6926 return obj->objectId;
6929 unsigned yaffs_GetObjectType(yaffs_Object * obj)
6931 obj = yaffs_GetEquivalentObject(obj);
6933 switch (obj->variantType) {
6934 case YAFFS_OBJECT_TYPE_FILE:
6937 case YAFFS_OBJECT_TYPE_DIRECTORY:
6940 case YAFFS_OBJECT_TYPE_SYMLINK:
6943 case YAFFS_OBJECT_TYPE_HARDLINK:
6946 case YAFFS_OBJECT_TYPE_SPECIAL:
6947 if (S_ISFIFO(obj->yst_mode))
6949 if (S_ISCHR(obj->yst_mode))
6951 if (S_ISBLK(obj->yst_mode))
6953 if (S_ISSOCK(obj->yst_mode))
6961 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
6963 obj = yaffs_GetEquivalentObject(obj);
6964 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6965 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
6967 return yaffs_CloneString(_Y(""));
6971 #ifndef CONFIG_YAFFS_WINCE
6973 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
6975 unsigned int valid = attr->ia_valid;
6977 if (valid & ATTR_MODE)
6978 obj->yst_mode = attr->ia_mode;
6979 if (valid & ATTR_UID)
6980 obj->yst_uid = attr->ia_uid;
6981 if (valid & ATTR_GID)
6982 obj->yst_gid = attr->ia_gid;
6984 if (valid & ATTR_ATIME)
6985 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
6986 if (valid & ATTR_CTIME)
6987 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
6988 if (valid & ATTR_MTIME)
6989 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
6991 if (valid & ATTR_SIZE)
6992 yaffs_ResizeFile(obj, attr->ia_size);
6994 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6999 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
7001 unsigned int valid = 0;
7003 attr->ia_mode = obj->yst_mode;
7005 attr->ia_uid = obj->yst_uid;
7007 attr->ia_gid = obj->yst_gid;
7010 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7011 valid |= ATTR_ATIME;
7012 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7013 valid |= ATTR_CTIME;
7014 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7015 valid |= ATTR_MTIME;
7017 attr->ia_size = yaffs_GetFileSize(obj);
7020 attr->ia_valid = valid;
7029 int yaffs_DumpObject(yaffs_Object * obj)
7033 yaffs_GetObjectName(obj, name, 256);
7035 T(YAFFS_TRACE_ALWAYS,
7037 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7038 " chunk %d type %d size %d\n"
7039 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7040 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
7041 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7047 /*---------------------------- Initialisation code -------------------------------------- */
7049 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
7052 /* Common functions, gotta have */
7053 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
7056 #ifdef CONFIG_YAFFS_YAFFS2
7058 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7059 if (dev->writeChunkWithTagsToNAND &&
7060 dev->readChunkWithTagsFromNAND &&
7061 !dev->writeChunkToNAND &&
7062 !dev->readChunkFromNAND &&
7063 dev->markNANDBlockBad && dev->queryNANDBlock)
7067 /* Can use the "spare" style interface for yaffs1 */
7068 if (!dev->isYaffs2 &&
7069 !dev->writeChunkWithTagsToNAND &&
7070 !dev->readChunkWithTagsFromNAND &&
7071 dev->writeChunkToNAND &&
7072 dev->readChunkFromNAND &&
7073 !dev->markNANDBlockBad && !dev->queryNANDBlock)
7080 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7082 /* Initialise the unlinked, deleted, root and lost and found directories */
7084 dev->lostNFoundDir = dev->rootDir = NULL;
7085 dev->unlinkedDir = dev->deletedDir = NULL;
7088 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7091 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7094 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7095 YAFFS_ROOT_MODE | S_IFDIR);
7096 dev->lostNFoundDir =
7097 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7098 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7100 if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
7101 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7108 int yaffs_GutsInitialise(yaffs_Device * dev)
7110 int init_failed = 0;
7114 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7116 /* Check stuff that must be set */
7119 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7123 dev->internalStartBlock = dev->startBlock;
7124 dev->internalEndBlock = dev->endBlock;
7125 dev->blockOffset = 0;
7126 dev->chunkOffset = 0;
7127 dev->nFreeChunks = 0;
7129 if (dev->startBlock == 0) {
7130 dev->internalStartBlock = dev->startBlock + 1;
7131 dev->internalEndBlock = dev->endBlock + 1;
7132 dev->blockOffset = 1;
7133 dev->chunkOffset = dev->nChunksPerBlock;
7136 /* Check geometry parameters. */
7138 if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
7139 (!dev->isYaffs2 && dev->totalBytesPerChunk != 512) ||
7140 (dev->inbandTags && !dev->isYaffs2 ) ||
7141 dev->nChunksPerBlock < 2 ||
7142 dev->nReservedBlocks < 2 ||
7143 dev->internalStartBlock <= 0 ||
7144 dev->internalEndBlock <= 0 ||
7145 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
7147 T(YAFFS_TRACE_ALWAYS,
7149 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7150 TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
7154 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7155 T(YAFFS_TRACE_ALWAYS,
7156 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7160 /* Sort out space for inband tags, if required */
7162 dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7164 dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
7166 /* Got the right mix of functions? */
7167 if (!yaffs_CheckDevFunctions(dev)) {
7168 /* Function missing */
7169 T(YAFFS_TRACE_ALWAYS,
7171 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7176 /* This is really a compilation check. */
7177 if (!yaffs_CheckStructures()) {
7178 T(YAFFS_TRACE_ALWAYS,
7179 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7183 if (dev->isMounted) {
7184 T(YAFFS_TRACE_ALWAYS,
7185 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7189 /* Finished with most checks. One or two more checks happen later on too. */
7195 /* OK now calculate a few things for the device */
7198 * Calculate all the chunk size manipulation numbers:
7201 __u32 x = dev->nDataBytesPerChunk;
7202 /* We always use dev->chunkShift and dev->chunkDiv */
7203 dev->chunkShift = Shifts(x);
7204 x >>= dev->chunkShift;
7206 /* We only use chunk mask if chunkDiv is 1 */
7207 dev->chunkMask = (1<<dev->chunkShift) - 1;
7212 * Calculate chunkGroupBits.
7213 * We need to find the next power of 2 > than internalEndBlock
7216 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7220 /* Set up tnode width if wide tnodes are enabled. */
7221 if(!dev->wideTnodesDisabled){
7222 /* bits must be even so that we end up with 32-bit words */
7226 dev->tnodeWidth = 16;
7228 dev->tnodeWidth = bits;
7231 dev->tnodeWidth = 16;
7233 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7235 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7236 * so if the bitwidth of the
7237 * chunk range we're using is greater than 16 we need
7238 * to figure out chunk shift and chunkGroupSize
7241 if (bits <= dev->tnodeWidth)
7242 dev->chunkGroupBits = 0;
7244 dev->chunkGroupBits = bits - dev->tnodeWidth;
7247 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7249 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7250 /* We have a problem because the soft delete won't work if
7251 * the chunk group size > chunks per block.
7252 * This can be remedied by using larger "virtual blocks".
7254 T(YAFFS_TRACE_ALWAYS,
7255 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7260 /* OK, we've finished verifying the device, lets continue with initialisation */
7262 /* More device initialisation */
7263 dev->garbageCollections = 0;
7264 dev->passiveGarbageCollections = 0;
7265 dev->currentDirtyChecker = 0;
7266 dev->bufferedBlock = -1;
7267 dev->doingBufferedBlockRewrite = 0;
7268 dev->nDeletedFiles = 0;
7269 dev->nBackgroundDeletions = 0;
7270 dev->nUnlinkedFiles = 0;
7272 dev->eccUnfixed = 0;
7273 dev->tagsEccFixed = 0;
7274 dev->tagsEccUnfixed = 0;
7275 dev->nErasureFailures = 0;
7276 dev->nErasedBlocks = 0;
7278 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7280 /* Initialise temporary buffers and caches. */
7281 if(!yaffs_InitialiseTempBuffers(dev))
7284 dev->srCache = NULL;
7285 dev->gcCleanupList = NULL;
7289 dev->nShortOpCaches > 0) {
7292 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7294 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
7295 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7298 buf = dev->srCache = YMALLOC(srCacheBytes);
7301 memset(dev->srCache,0,srCacheBytes);
7303 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7304 dev->srCache[i].object = NULL;
7305 dev->srCache[i].lastUse = 0;
7306 dev->srCache[i].dirty = 0;
7307 dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
7318 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7319 if(!dev->gcCleanupList)
7323 if (dev->isYaffs2) {
7324 dev->useHeaderFileSize = 1;
7326 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7329 yaffs_InitialiseTnodes(dev);
7330 yaffs_InitialiseObjects(dev);
7332 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7337 /* Now scan the flash. */
7338 if (dev->isYaffs2) {
7339 if(yaffs_CheckpointRestore(dev)) {
7340 T(YAFFS_TRACE_ALWAYS,
7341 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7344 /* Clean up the mess caused by an aborted checkpoint load
7345 * and scan backwards.
7347 yaffs_DeinitialiseBlocks(dev);
7348 yaffs_DeinitialiseTnodes(dev);
7349 yaffs_DeinitialiseObjects(dev);
7352 dev->nErasedBlocks = 0;
7353 dev->nFreeChunks = 0;
7354 dev->allocationBlock = -1;
7355 dev->allocationPage = -1;
7356 dev->nDeletedFiles = 0;
7357 dev->nUnlinkedFiles = 0;
7358 dev->nBackgroundDeletions = 0;
7359 dev->oldestDirtySequence = 0;
7361 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7364 yaffs_InitialiseTnodes(dev);
7365 yaffs_InitialiseObjects(dev);
7367 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7370 if(!init_failed && !yaffs_ScanBackwards(dev))
7374 if(!yaffs_Scan(dev))
7379 /* Clean up the mess */
7380 T(YAFFS_TRACE_TRACING,
7381 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7383 yaffs_Deinitialise(dev);
7387 /* Zero out stats */
7388 dev->nPageReads = 0;
7389 dev->nPageWrites = 0;
7390 dev->nBlockErasures = 0;
7392 dev->nRetriedWrites = 0;
7394 dev->nRetiredBlocks = 0;
7396 yaffs_VerifyFreeChunks(dev);
7397 yaffs_VerifyBlocks(dev);
7400 T(YAFFS_TRACE_TRACING,
7401 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7406 void yaffs_Deinitialise(yaffs_Device * dev)
7408 if (dev->isMounted) {
7411 yaffs_DeinitialiseBlocks(dev);
7412 yaffs_DeinitialiseTnodes(dev);
7413 yaffs_DeinitialiseObjects(dev);
7414 if (dev->nShortOpCaches > 0 &&
7417 for (i = 0; i < dev->nShortOpCaches; i++) {
7418 if(dev->srCache[i].data)
7419 YFREE(dev->srCache[i].data);
7420 dev->srCache[i].data = NULL;
7423 YFREE(dev->srCache);
7424 dev->srCache = NULL;
7427 YFREE(dev->gcCleanupList);
7429 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
7430 YFREE(dev->tempBuffer[i].buffer);
7439 static int yaffs_CountFreeChunks(yaffs_Device * dev)
7444 yaffs_BlockInfo *blk;
7446 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7448 blk = yaffs_GetBlockInfo(dev, b);
7450 switch (blk->blockState) {
7451 case YAFFS_BLOCK_STATE_EMPTY:
7452 case YAFFS_BLOCK_STATE_ALLOCATING:
7453 case YAFFS_BLOCK_STATE_COLLECTING:
7454 case YAFFS_BLOCK_STATE_FULL:
7456 (dev->nChunksPerBlock - blk->pagesInUse +
7457 blk->softDeletions);
7468 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
7470 /* This is what we report to the outside world */
7473 int nDirtyCacheChunks;
7474 int blocksForCheckpoint;
7477 nFree = dev->nFreeChunks;
7479 nFree = yaffs_CountFreeChunks(dev);
7482 nFree += dev->nDeletedFiles;
7484 /* Now count the number of dirty chunks in the cache and subtract those */
7488 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7489 if (dev->srCache[i].dirty)
7490 nDirtyCacheChunks++;
7494 nFree -= nDirtyCacheChunks;
7496 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7498 /* Now we figure out how much to reserve for the checkpoint and report that... */
7499 blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7500 if(blocksForCheckpoint < 0)
7501 blocksForCheckpoint = 0;
7503 nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7512 static int yaffs_freeVerificationFailures;
7514 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
7519 if(yaffs_SkipVerification(dev))
7522 counted = yaffs_CountFreeChunks(dev);
7524 difference = dev->nFreeChunks - counted;
7527 T(YAFFS_TRACE_ALWAYS,
7528 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7529 dev->nFreeChunks, counted, difference));
7530 yaffs_freeVerificationFailures++;
7534 /*---------------------------------------- YAFFS test code ----------------------*/
7536 #define yaffs_CheckStruct(structure,syze, name) \
7538 if(sizeof(structure) != syze) \
7540 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
7541 name,syze,sizeof(structure))); \
7542 return YAFFS_FAIL; \
7546 static int yaffs_CheckStructures(void)
7548 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7549 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7550 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7551 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7552 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode");
7554 #ifndef CONFIG_YAFFS_WINCE
7555 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");