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 1.120 2010-03-15 23:10:34 charles Exp $";
18 #include "yaffs_trace.h"
20 #include "yaffsinterface.h"
21 #include "yaffs_guts.h"
22 #include "yaffs_tagsvalidity.h"
23 #include "yaffs_getblockinfo.h"
25 #include "yaffs_tagscompat.h"
26 #ifndef CONFIG_YAFFS_USE_OWN_SORT
27 #include "yaffs_qsort.h"
29 #include "yaffs_nand.h"
31 #include "yaffs_checkptrw.h"
33 #include "yaffs_nand.h"
34 #include "yaffs_packedtags2.h"
37 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
38 #define YAFFS_GC_GOOD_ENOUGH 2
39 #define YAFFS_GC_PASSIVE_THRESHOLD 4
40 #define YAFFS_SMALL_HOLE_THRESHOLD 3
42 #include "yaffs_ecc.h"
45 /* Robustification (if it ever comes about...) */
46 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
47 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
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 void yaffs_UpdateParent(yaffs_Object *obj);
57 static int yaffs_UnlinkObject(yaffs_Object *obj);
58 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
60 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
62 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
64 yaffs_ExtendedTags *tags,
66 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
67 int chunkInNAND, int inScan);
69 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
70 yaffs_ObjectType type);
71 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
73 static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
74 int force, int isShrink, int shadows);
75 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
76 static int yaffs_CheckStructures(void);
77 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
78 int chunkOffset, int *limit);
79 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
81 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
84 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
87 static int yaffs_UnlinkWorker(yaffs_Object *obj);
89 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
92 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
93 yaffs_BlockInfo **blockUsedPtr);
95 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
97 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
99 static void yaffs_VerifyDirectory(yaffs_Object *directory);
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,
116 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
117 yaffs_FileStructure *fStruct,
120 static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize);
121 static void yaffs_SkipRestOfBlock(yaffs_Device *dev);
122 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
125 yaffs_ExtendedTags *tags);
127 /* Function to calculate chunk and offset */
129 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
135 chunk = (__u32)(addr >> dev->chunkShift);
137 if (dev->chunkDiv == 1) {
138 /* easy power of 2 case */
139 offset = (__u32)(addr & dev->chunkMask);
141 /* Non power-of-2 case */
145 chunk /= dev->chunkDiv;
147 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
148 offset = (__u32)(addr - chunkBase);
155 /* Function to return the number of shifts for a power of 2 greater than or
156 * equal to the given number
157 * Note we don't try to cater for all possible numbers and this does not have to
158 * be hellishly efficient.
161 static __u32 ShiftsGE(__u32 x)
166 nShifts = extraBits = 0;
181 /* Function to return the number of shifts to get a 1 in bit 0
184 static __u32 Shifts(__u32 x)
204 * Temporary buffer manipulations.
207 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
210 __u8 *buf = (__u8 *)1;
212 memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
214 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
215 dev->tempBuffer[i].line = 0; /* not in use */
216 dev->tempBuffer[i].buffer = buf =
217 YMALLOC_DMA(dev->param.totalBytesPerChunk);
220 return buf ? YAFFS_OK : YAFFS_FAIL;
223 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
228 if (dev->tempInUse > dev->maxTemp)
229 dev->maxTemp = dev->tempInUse;
231 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
232 if (dev->tempBuffer[i].line == 0) {
233 dev->tempBuffer[i].line = lineNo;
234 if ((i + 1) > dev->maxTemp) {
235 dev->maxTemp = i + 1;
236 for (j = 0; j <= i; j++)
237 dev->tempBuffer[j].maxLine =
238 dev->tempBuffer[j].line;
241 return dev->tempBuffer[i].buffer;
245 T(YAFFS_TRACE_BUFFERS,
246 (TSTR("Out of temp buffers at line %d, other held by lines:"),
248 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
249 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
251 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
254 * If we got here then we have to allocate an unmanaged one
258 dev->unmanagedTempAllocations++;
259 return YMALLOC(dev->nDataBytesPerChunk);
263 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
270 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
271 if (dev->tempBuffer[i].buffer == buffer) {
272 dev->tempBuffer[i].line = 0;
278 /* assume it is an unmanaged one. */
279 T(YAFFS_TRACE_BUFFERS,
280 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
283 dev->unmanagedTempDeallocations++;
289 * Determine if we have a managed buffer.
291 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
295 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
296 if (dev->tempBuffer[i].buffer == buffer)
300 for (i = 0; i < dev->param.nShortOpCaches; i++) {
301 if (dev->srCache[i].data == buffer)
305 if (buffer == dev->checkpointBuffer)
308 T(YAFFS_TRACE_ALWAYS,
309 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
316 * Chunk bitmap manipulations
319 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
321 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
323 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
327 return dev->chunkBits +
328 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
331 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
333 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
334 chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
336 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
342 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
344 __u8 *blkBits = yaffs_BlockBits(dev, blk);
346 memset(blkBits, 0, dev->chunkBitmapStride);
349 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
351 __u8 *blkBits = yaffs_BlockBits(dev, blk);
353 yaffs_VerifyChunkBitId(dev, blk, chunk);
355 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
358 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
360 __u8 *blkBits = yaffs_BlockBits(dev, blk);
362 yaffs_VerifyChunkBitId(dev, blk, chunk);
364 blkBits[chunk / 8] |= (1 << (chunk & 7));
367 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
369 __u8 *blkBits = yaffs_BlockBits(dev, blk);
370 yaffs_VerifyChunkBitId(dev, blk, chunk);
372 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
375 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
377 __u8 *blkBits = yaffs_BlockBits(dev, blk);
379 for (i = 0; i < dev->chunkBitmapStride; i++) {
387 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
389 __u8 *blkBits = yaffs_BlockBits(dev, blk);
392 for (i = 0; i < dev->chunkBitmapStride; i++) {
409 static int yaffs_SkipVerification(yaffs_Device *dev)
412 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
415 static int yaffs_SkipFullVerification(yaffs_Device *dev)
418 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
421 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
424 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
427 static const char *blockStateName[] = {
440 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
445 if (yaffs_SkipVerification(dev))
448 /* Report illegal runtime states */
449 if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
450 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
452 switch (bi->blockState) {
453 case YAFFS_BLOCK_STATE_UNKNOWN:
454 case YAFFS_BLOCK_STATE_SCANNING:
455 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
456 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
457 n, blockStateName[bi->blockState]));
460 /* Check pages in use and soft deletions are legal */
462 actuallyUsed = bi->pagesInUse - bi->softDeletions;
464 if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock ||
465 bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
466 actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock)
467 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
468 n, bi->pagesInUse, bi->softDeletions));
471 /* Check chunk bitmap legal */
472 inUse = yaffs_CountChunkBits(dev, n);
473 if (inUse != bi->pagesInUse)
474 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
475 n, bi->pagesInUse, inUse));
477 /* Check that the sequence number is valid.
478 * Ten million is legal, but is very unlikely
480 if (dev->param.isYaffs2 &&
481 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
482 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
483 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
484 n, bi->sequenceNumber));
487 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
490 yaffs_VerifyBlock(dev, bi, n);
492 /* After collection the block should be in the erased state */
493 /* This will need to change if we do partial gc */
495 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
496 bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
497 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
502 static void yaffs_VerifyBlocks(yaffs_Device *dev)
505 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
506 int nIllegalBlockStates = 0;
508 if (yaffs_SkipVerification(dev))
511 memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
513 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
514 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
515 yaffs_VerifyBlock(dev, bi, i);
517 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
518 nBlocksPerState[bi->blockState]++;
520 nIllegalBlockStates++;
523 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
524 T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
526 T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
527 if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
528 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
530 for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
531 T(YAFFS_TRACE_VERIFY,
532 (TSTR("%s %d blocks"TENDSTR),
533 blockStateName[i], nBlocksPerState[i]));
535 if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
536 T(YAFFS_TRACE_VERIFY,
537 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
538 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
540 if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
541 T(YAFFS_TRACE_VERIFY,
542 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
543 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
545 if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
546 T(YAFFS_TRACE_VERIFY,
547 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
548 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
550 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
555 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
556 * case those tests will not be performed.
558 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
560 if (obj && yaffs_SkipVerification(obj->myDev))
563 if (!(tags && obj && oh)) {
564 T(YAFFS_TRACE_VERIFY,
565 (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
570 if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
571 oh->type > YAFFS_OBJECT_TYPE_MAX)
572 T(YAFFS_TRACE_VERIFY,
573 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
574 tags->objectId, oh->type));
576 if (tags->objectId != obj->objectId)
577 T(YAFFS_TRACE_VERIFY,
578 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
579 tags->objectId, obj->objectId));
583 * Check that the object's parent ids match if parentCheck requested.
585 * Tests do not apply to the root object.
588 if (parentCheck && tags->objectId > 1 && !obj->parent)
589 T(YAFFS_TRACE_VERIFY,
590 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
591 tags->objectId, oh->parentObjectId));
593 if (parentCheck && obj->parent &&
594 oh->parentObjectId != obj->parent->objectId &&
595 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
596 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
597 T(YAFFS_TRACE_VERIFY,
598 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
599 tags->objectId, oh->parentObjectId, obj->parent->objectId));
601 if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
602 T(YAFFS_TRACE_VERIFY,
603 (TSTR("Obj %d header name is NULL"TENDSTR),
606 if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
607 T(YAFFS_TRACE_VERIFY,
608 (TSTR("Obj %d header name is 0xFF"TENDSTR),
614 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
615 __u32 level, int chunkOffset)
618 yaffs_Device *dev = obj->myDev;
624 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
625 if (tn->internal[i]) {
626 ok = yaffs_VerifyTnodeWorker(obj,
629 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
632 } else if (level == 0) {
633 yaffs_ExtendedTags tags;
634 __u32 objectId = obj->objectId;
636 chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
638 for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
639 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
642 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
643 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
644 if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
645 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
646 objectId, chunkOffset, theChunk,
647 tags.objectId, tags.chunkId));
660 static void yaffs_VerifyFile(yaffs_Object *obj)
662 int requiredTallness;
668 yaffs_ExtendedTags tags;
675 if (yaffs_SkipVerification(obj->myDev))
679 objectId = obj->objectId;
681 /* Check file size is consistent with tnode depth */
682 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
683 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
684 requiredTallness = 0;
686 x >>= YAFFS_TNODES_INTERNAL_BITS;
690 actualTallness = obj->variant.fileVariant.topLevel;
692 /* Check that the chunks in the tnode tree are all correct.
693 * We do this by scanning through the tnode tree and
694 * checking the tags for every chunk match.
697 if (yaffs_SkipNANDVerification(dev))
700 for (i = 1; i <= lastChunk; i++) {
701 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
704 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
706 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
707 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
708 if (tags.objectId != objectId || tags.chunkId != i) {
709 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
710 objectId, i, theChunk,
711 tags.objectId, tags.chunkId));
719 static void yaffs_VerifyHardLink(yaffs_Object *obj)
721 if (obj && yaffs_SkipVerification(obj->myDev))
724 /* Verify sane equivalent object */
727 static void yaffs_VerifySymlink(yaffs_Object *obj)
729 if (obj && yaffs_SkipVerification(obj->myDev))
732 /* Verify symlink string */
735 static void yaffs_VerifySpecial(yaffs_Object *obj)
737 if (obj && yaffs_SkipVerification(obj->myDev))
741 static void yaffs_VerifyObject(yaffs_Object *obj)
750 __u32 chunkShouldNotBeDeleted;
756 if (obj->beingCreated)
761 if (yaffs_SkipVerification(dev))
764 /* Check sane object header chunk */
766 chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
767 chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
769 chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
770 chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
771 chunkValid = chunkInRange &&
772 yaffs_CheckChunkBit(dev,
773 obj->hdrChunk / dev->param.nChunksPerBlock,
774 obj->hdrChunk % dev->param.nChunksPerBlock);
775 chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
778 (!chunkIdOk || chunkShouldNotBeDeleted)) {
779 T(YAFFS_TRACE_VERIFY,
780 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
781 obj->objectId, obj->hdrChunk,
782 chunkIdOk ? "" : ",out of range",
783 chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
786 if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
787 yaffs_ExtendedTags tags;
788 yaffs_ObjectHeader *oh;
789 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
791 oh = (yaffs_ObjectHeader *)buffer;
793 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
796 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
798 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
801 /* Verify it has a parent */
802 if (obj && !obj->fake &&
803 (!obj->parent || obj->parent->myDev != dev)) {
804 T(YAFFS_TRACE_VERIFY,
805 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
806 obj->objectId, obj->parent));
809 /* Verify parent is a directory */
810 if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
811 T(YAFFS_TRACE_VERIFY,
812 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
813 obj->objectId, obj->parent->variantType));
816 switch (obj->variantType) {
817 case YAFFS_OBJECT_TYPE_FILE:
818 yaffs_VerifyFile(obj);
820 case YAFFS_OBJECT_TYPE_SYMLINK:
821 yaffs_VerifySymlink(obj);
823 case YAFFS_OBJECT_TYPE_DIRECTORY:
824 yaffs_VerifyDirectory(obj);
826 case YAFFS_OBJECT_TYPE_HARDLINK:
827 yaffs_VerifyHardLink(obj);
829 case YAFFS_OBJECT_TYPE_SPECIAL:
830 yaffs_VerifySpecial(obj);
832 case YAFFS_OBJECT_TYPE_UNKNOWN:
834 T(YAFFS_TRACE_VERIFY,
835 (TSTR("Obj %d has illegaltype %d"TENDSTR),
836 obj->objectId, obj->variantType));
841 static void yaffs_VerifyObjects(yaffs_Device *dev)
845 struct ylist_head *lh;
847 if (yaffs_SkipVerification(dev))
850 /* Iterate through the objects in each hash entry */
852 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
853 ylist_for_each(lh, &dev->objectBucket[i].list) {
855 obj = ylist_entry(lh, yaffs_Object, hashLink);
856 yaffs_VerifyObject(obj);
864 * Simple hash function. Needs to have a reasonable spread
867 static Y_INLINE int yaffs_HashFunction(int n)
870 return n % YAFFS_NOBJECT_BUCKETS;
874 * Access functions to useful fake objects.
875 * Note that root might have a presence in NAND if permissions are set.
878 yaffs_Object *yaffs_Root(yaffs_Device *dev)
883 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
885 return dev->lostNFoundDir;
890 * Erased NAND checking functions
893 int yaffs_CheckFF(__u8 *buffer, int nBytes)
895 /* Horrible, slow implementation */
904 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
907 int retval = YAFFS_OK;
908 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
909 yaffs_ExtendedTags tags;
912 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
914 if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
917 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
918 T(YAFFS_TRACE_NANDACCESS,
919 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
923 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
930 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
933 yaffs_ExtendedTags *tags)
935 int retval = YAFFS_OK;
936 yaffs_ExtendedTags tempTags;
937 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
940 result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
941 if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
942 tempTags.objectId != tags->objectId ||
943 tempTags.chunkId != tags->chunkId ||
944 tempTags.byteCount != tags->byteCount)
947 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
952 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
954 yaffs_ExtendedTags *tags,
961 yaffs_InvalidateCheckpoint(dev);
964 yaffs_BlockInfo *bi = 0;
967 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
973 /* First check this chunk is erased, if it needs
974 * checking. The checking policy (unless forced
975 * always on) is as follows:
977 * Check the first page we try to write in a block.
978 * If the check passes then we don't need to check any
979 * more. If the check fails, we check again...
980 * If the block has been erased, we don't need to check.
982 * However, if the block has been prioritised for gc,
983 * then we think there might be something odd about
984 * this block and stop using it.
986 * Rationale: We should only ever see chunks that have
987 * not been erased if there was a partially written
988 * chunk due to power loss. This checking policy should
989 * catch that case with very few checks and thus save a
990 * lot of checks that are most likely not needed.
993 * If an erase check fails or the write fails we skip the
997 /* let's give it a try */
1000 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
1001 bi->skipErasedCheck = 0;
1003 if (!bi->skipErasedCheck) {
1004 erasedOk = yaffs_CheckChunkErased(dev, chunk);
1005 if (erasedOk != YAFFS_OK) {
1006 T(YAFFS_TRACE_ERROR,
1007 (TSTR("**>> yaffs chunk %d was not erased"
1010 /* If not erased, delete this one,
1011 * skip rest of block and
1012 * try another chunk */
1013 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
1014 yaffs_SkipRestOfBlock(dev);
1019 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
1022 if(!bi->skipErasedCheck)
1023 writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
1025 if (writeOk != YAFFS_OK) {
1026 /* Clean up aborted write, skip to next block and
1027 * try another chunk */
1028 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
1032 bi->skipErasedCheck = 1;
1034 /* Copy the data into the robustification buffer */
1035 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
1037 } while (writeOk != YAFFS_OK &&
1038 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1044 T(YAFFS_TRACE_ERROR,
1045 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1048 dev->nRetriedWrites += (attempts - 1);
1056 * Oldest Dirty Sequence Number handling.
1059 /* yaffs_CalcOldestDirtySequence()
1060 * yaffs_FindOldestDirtySequence()
1061 * Calculate the oldest dirty sequence number if we don't know it.
1063 static void yaffs_CalcOldestDirtySequence(yaffs_Device *dev)
1067 unsigned blockNo = 0;
1070 if(!dev->param.isYaffs2)
1073 /* Find the oldest dirty sequence number. */
1074 seq = dev->sequenceNumber + 1;
1076 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
1077 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1078 (b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
1079 b->sequenceNumber < seq) {
1080 seq = b->sequenceNumber;
1087 dev->oldestDirtySequence = seq;
1088 dev->oldestDirtyBlock = blockNo;
1094 static void yaffs_FindOldestDirtySequence(yaffs_Device *dev)
1096 if(dev->param.isYaffs2 && !dev->oldestDirtySequence)
1097 yaffs_CalcOldestDirtySequence(dev);
1101 * yaffs_ClearOldestDirtySequence()
1102 * Called when a block is erased or marked bad. (ie. when its sequenceNumber
1103 * becomes invalid). If the value matches the oldest then we clear
1104 * dev->oldestDirtySequence to force its recomputation.
1106 static void yaffs_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
1109 if(!dev->param.isYaffs2)
1112 if(!bi || bi->sequenceNumber == dev->oldestDirtySequence){
1113 dev->oldestDirtySequence = 0;
1114 dev->oldestDirtyBlock = 0;
1119 * yaffs_UpdateOldestDirtySequence()
1120 * Update the oldest dirty sequence number whenever we dirty a block.
1121 * Only do this if the oldestDirtySequence is actually being tracked.
1123 static void yaffs_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi)
1125 if(dev->param.isYaffs2 && dev->oldestDirtySequence){
1126 if(dev->oldestDirtySequence > bi->sequenceNumber){
1127 dev->oldestDirtySequence = bi->sequenceNumber;
1128 dev->oldestDirtyBlock = blockNo;
1134 * Block retiring for handling a broken block.
1137 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1139 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1141 yaffs_InvalidateCheckpoint(dev);
1143 yaffs_ClearOldestDirtySequence(dev,bi);
1145 if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1146 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1147 T(YAFFS_TRACE_ALWAYS, (TSTR(
1148 "yaffs: Failed to mark bad and erase block %d"
1149 TENDSTR), blockInNAND));
1151 yaffs_ExtendedTags tags;
1152 int chunkId = blockInNAND * dev->param.nChunksPerBlock;
1154 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1156 memset(buffer, 0xff, dev->nDataBytesPerChunk);
1157 yaffs_InitialiseTags(&tags);
1158 tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1159 if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
1160 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1161 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1162 TCONT("write bad block marker to block %d")
1163 TENDSTR), blockInNAND));
1165 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1169 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1170 bi->gcPrioritise = 0;
1171 bi->needsRetiring = 0;
1173 dev->nRetiredBlocks++;
1177 * Functions for robustisizing TODO
1181 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1183 const yaffs_ExtendedTags *tags)
1186 chunkInNAND=chunkInNAND;
1191 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1192 const yaffs_ExtendedTags *tags)
1195 chunkInNAND=chunkInNAND;
1199 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1201 if (!bi->gcPrioritise) {
1202 bi->gcPrioritise = 1;
1203 dev->hasPendingPrioritisedGCs = 1;
1204 bi->chunkErrorStrikes++;
1206 if (bi->chunkErrorStrikes > 3) {
1207 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1208 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1214 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1217 int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
1218 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1220 yaffs_HandleChunkError(dev, bi);
1223 /* Was an actual write failure, so mark the block for retirement */
1224 bi->needsRetiring = 1;
1225 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1226 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1229 /* Delete the chunk */
1230 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1231 yaffs_SkipRestOfBlock(dev);
1235 /*---------------- Name handling functions ------------*/
1237 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1242 const YUCHAR *bname = (const YUCHAR *) name;
1244 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1246 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1247 sum += yaffs_toupper(*bname) * i;
1249 sum += (*bname) * i;
1258 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1260 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1261 memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1262 if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
1263 yaffs_strcpy(obj->shortName, name);
1265 obj->shortName[0] = _Y('\0');
1267 obj->sum = yaffs_CalcNameSum(name);
1270 /*-------------------- TNODES -------------------
1272 * List of spare tnodes
1273 * The list is hooked together using the first pointer
1277 /* yaffs_CreateTnodes creates a bunch more tnodes and
1278 * adds them to the tnode free list.
1279 * Don't use this function directly
1281 static Y_INLINE int yaffs_CalcTnodeSize(yaffs_Device *dev)
1284 /* Calculate the tnode size in bytes for variable width tnode support.
1285 * Must be a multiple of 32-bits */
1286 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1288 if (tnodeSize < sizeof(yaffs_Tnode))
1289 tnodeSize = sizeof(yaffs_Tnode);
1293 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1296 int tnodeSize = yaffs_CalcTnodeSize(dev);
1297 yaffs_Tnode *newTnodes;
1301 yaffs_TnodeList *tnl;
1307 /* make these things */
1309 newTnodes = YMALLOC(nTnodes * tnodeSize);
1310 mem = (__u8 *)newTnodes;
1313 T(YAFFS_TRACE_ERROR,
1314 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1318 /* Hook them into the free list */
1320 for (i = 0; i < nTnodes - 1; i++) {
1321 newTnodes[i].internal[0] = &newTnodes[i + 1];
1322 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1323 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1327 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1328 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1329 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1331 dev->freeTnodes = newTnodes;
1333 /* New hookup for wide tnodes */
1334 for (i = 0; i < nTnodes - 1; i++) {
1335 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1336 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1337 curr->internal[0] = next;
1340 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1341 curr->internal[0] = dev->freeTnodes;
1342 dev->freeTnodes = (yaffs_Tnode *)mem;
1347 dev->nFreeTnodes += nTnodes;
1348 dev->nTnodesCreated += nTnodes;
1350 /* Now add this bunch of tnodes to a list for freeing up.
1351 * NB If we can't add this to the management list it isn't fatal
1352 * but it just means we can't free this bunch of tnodes later.
1355 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1357 T(YAFFS_TRACE_ERROR,
1359 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1362 tnl->tnodes = newTnodes;
1363 tnl->next = dev->allocatedTnodeList;
1364 dev->allocatedTnodeList = tnl;
1367 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1372 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1374 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1376 yaffs_Tnode *tn = NULL;
1378 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1379 tn = YMALLOC(yaffs_CalcTnodeSize(dev));
1381 dev->nTnodesCreated++;
1383 /* If there are none left make more */
1384 if (!dev->freeTnodes)
1385 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1387 if (dev->freeTnodes) {
1388 tn = dev->freeTnodes;
1389 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1390 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1391 /* Hoosterman, this thing looks like it isn't in the list */
1392 T(YAFFS_TRACE_ALWAYS,
1393 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1396 dev->freeTnodes = dev->freeTnodes->internal[0];
1400 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1405 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1407 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1408 int tnodeSize = yaffs_CalcTnodeSize(dev);
1411 memset(tn, 0, tnodeSize);
1416 /* FreeTnode frees up a tnode and puts it back on the free list */
1417 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1420 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1422 dev->nTnodesCreated--;
1424 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1425 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1426 /* Hoosterman, this thing looks like it is already in the list */
1427 T(YAFFS_TRACE_ALWAYS,
1428 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1430 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1432 tn->internal[0] = dev->freeTnodes;
1433 dev->freeTnodes = tn;
1437 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1440 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1442 /* Free the list of allocated tnodes */
1443 yaffs_TnodeList *tmp;
1445 while (dev->allocatedTnodeList) {
1446 tmp = dev->allocatedTnodeList->next;
1448 YFREE(dev->allocatedTnodeList->tnodes);
1449 YFREE(dev->allocatedTnodeList);
1450 dev->allocatedTnodeList = tmp;
1454 dev->freeTnodes = NULL;
1455 dev->nFreeTnodes = 0;
1456 dev->nTnodesCreated = 0;
1459 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1461 dev->allocatedTnodeList = NULL;
1462 dev->freeTnodes = NULL;
1463 dev->nFreeTnodes = 0;
1464 dev->nTnodesCreated = 0;
1468 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1471 __u32 *map = (__u32 *)tn;
1477 pos &= YAFFS_TNODES_LEVEL0_MASK;
1478 val >>= dev->chunkGroupBits;
1480 bitInMap = pos * dev->tnodeWidth;
1481 wordInMap = bitInMap / 32;
1482 bitInWord = bitInMap & (32 - 1);
1484 mask = dev->tnodeMask << bitInWord;
1486 map[wordInMap] &= ~mask;
1487 map[wordInMap] |= (mask & (val << bitInWord));
1489 if (dev->tnodeWidth > (32 - bitInWord)) {
1490 bitInWord = (32 - bitInWord);
1492 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1493 map[wordInMap] &= ~mask;
1494 map[wordInMap] |= (mask & (val >> bitInWord));
1498 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1501 __u32 *map = (__u32 *)tn;
1507 pos &= YAFFS_TNODES_LEVEL0_MASK;
1509 bitInMap = pos * dev->tnodeWidth;
1510 wordInMap = bitInMap / 32;
1511 bitInWord = bitInMap & (32 - 1);
1513 val = map[wordInMap] >> bitInWord;
1515 if (dev->tnodeWidth > (32 - bitInWord)) {
1516 bitInWord = (32 - bitInWord);
1518 val |= (map[wordInMap] << bitInWord);
1521 val &= dev->tnodeMask;
1522 val <<= dev->chunkGroupBits;
1527 /* ------------------- End of individual tnode manipulation -----------------*/
1529 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1530 * The look up tree is represented by the top tnode and the number of topLevel
1531 * in the tree. 0 means only the level 0 tnode is in the tree.
1534 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1535 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1536 yaffs_FileStructure *fStruct,
1539 yaffs_Tnode *tn = fStruct->top;
1541 int requiredTallness;
1542 int level = fStruct->topLevel;
1546 /* Check sane level and chunk Id */
1547 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1550 if (chunkId > YAFFS_MAX_CHUNK_ID)
1553 /* First check we're tall enough (ie enough topLevel) */
1555 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1556 requiredTallness = 0;
1558 i >>= YAFFS_TNODES_INTERNAL_BITS;
1562 if (requiredTallness > fStruct->topLevel)
1563 return NULL; /* Not tall enough, so we can't find it */
1565 /* Traverse down to level 0 */
1566 while (level > 0 && tn) {
1567 tn = tn->internal[(chunkId >>
1568 (YAFFS_TNODES_LEVEL0_BITS +
1570 YAFFS_TNODES_INTERNAL_BITS)) &
1571 YAFFS_TNODES_INTERNAL_MASK];
1578 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1579 * This happens in two steps:
1580 * 1. If the tree isn't tall enough, then make it taller.
1581 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1583 * Used when modifying the tree.
1585 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1586 * be plugged into the ttree.
1589 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1590 yaffs_FileStructure *fStruct,
1592 yaffs_Tnode *passedTn)
1594 int requiredTallness;
1602 /* Check sane level and page Id */
1603 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1606 if (chunkId > YAFFS_MAX_CHUNK_ID)
1609 /* First check we're tall enough (ie enough topLevel) */
1611 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1612 requiredTallness = 0;
1614 x >>= YAFFS_TNODES_INTERNAL_BITS;
1619 if (requiredTallness > fStruct->topLevel) {
1620 /* Not tall enough, gotta make the tree taller */
1621 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1623 tn = yaffs_GetTnode(dev);
1626 tn->internal[0] = fStruct->top;
1628 fStruct->topLevel++;
1630 T(YAFFS_TRACE_ERROR,
1631 (TSTR("yaffs: no more tnodes" TENDSTR)));
1637 /* Traverse down to level 0, adding anything we need */
1639 l = fStruct->topLevel;
1643 while (l > 0 && tn) {
1645 (YAFFS_TNODES_LEVEL0_BITS +
1646 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1647 YAFFS_TNODES_INTERNAL_MASK;
1650 if ((l > 1) && !tn->internal[x]) {
1651 /* Add missing non-level-zero tnode */
1652 tn->internal[x] = yaffs_GetTnode(dev);
1653 if(!tn->internal[x])
1655 } else if (l == 1) {
1656 /* Looking from level 1 at level 0 */
1658 /* If we already have one, then release it.*/
1659 if (tn->internal[x])
1660 yaffs_FreeTnode(dev, tn->internal[x]);
1661 tn->internal[x] = passedTn;
1663 } else if (!tn->internal[x]) {
1664 /* Don't have one, none passed in */
1665 tn->internal[x] = yaffs_GetTnode(dev);
1666 if(!tn->internal[x])
1671 tn = tn->internal[x];
1675 /* top is level 0 */
1677 memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1678 yaffs_FreeTnode(dev, passedTn);
1685 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1686 yaffs_ExtendedTags *tags, int objectId,
1691 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1692 if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
1693 theChunk % dev->param.nChunksPerBlock)) {
1695 if(dev->chunkGroupSize == 1)
1698 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1700 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1712 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1713 * chunks and tnodes in the file
1714 * Returns 1 if the tree was deleted.
1715 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1718 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1719 int chunkOffset, int *limit)
1724 yaffs_ExtendedTags tags;
1726 yaffs_Device *dev = in->myDev;
1732 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1734 if (tn->internal[i]) {
1735 if (limit && (*limit) < 0) {
1739 yaffs_DeleteWorker(in,
1747 YAFFS_TNODES_INTERNAL_BITS)
1752 yaffs_FreeTnode(dev,
1755 tn->internal[i] = NULL;
1759 return (allDone) ? 1 : 0;
1760 } else if (level == 0) {
1763 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1765 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1768 chunkInInode = (chunkOffset <<
1769 YAFFS_TNODES_LEVEL0_BITS) + i;
1772 yaffs_FindChunkInGroup(dev,
1778 if (foundChunk > 0) {
1779 yaffs_DeleteChunk(dev,
1784 *limit = *limit - 1;
1791 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1795 return (i < 0) ? 1 : 0;
1805 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1807 yaffs_BlockInfo *theBlock;
1810 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1812 blockNo = chunk / dev->param.nChunksPerBlock;
1813 theBlock = yaffs_GetBlockInfo(dev, blockNo);
1815 theBlock->softDeletions++;
1817 yaffs_UpdateOldestDirtySequence(dev, blockNo, theBlock);
1821 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1822 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1824 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1827 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1828 __u32 level, int chunkOffset)
1833 yaffs_Device *dev = in->myDev;
1838 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1840 if (tn->internal[i]) {
1842 yaffs_SoftDeleteWorker(in,
1848 YAFFS_TNODES_INTERNAL_BITS)
1851 yaffs_FreeTnode(dev,
1854 tn->internal[i] = NULL;
1856 /* Hoosterman... how could this happen? */
1860 return (allDone) ? 1 : 0;
1861 } else if (level == 0) {
1863 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1864 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1866 /* Note this does not find the real chunk, only the chunk group.
1867 * We make an assumption that a chunk group is not larger than
1870 yaffs_SoftDeleteChunk(dev, theChunk);
1871 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1885 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1888 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1889 if (obj->nDataChunks <= 0) {
1890 /* Empty file with no duplicate object headers, just delete it immediately */
1891 yaffs_FreeTnode(obj->myDev,
1892 obj->variant.fileVariant.top);
1893 obj->variant.fileVariant.top = NULL;
1894 T(YAFFS_TRACE_TRACING,
1895 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1897 yaffs_DoGenericObjectDeletion(obj);
1899 yaffs_SoftDeleteWorker(obj,
1900 obj->variant.fileVariant.top,
1901 obj->variant.fileVariant.
1903 obj->softDeleted = 1;
1908 /* Pruning removes any part of the file structure tree that is beyond the
1909 * bounds of the file (ie that does not point to chunks).
1911 * A file should only get pruned when its size is reduced.
1913 * Before pruning, the chunks must be pulled from the tree and the
1914 * level 0 tnode entries must be zeroed out.
1915 * Could also use this for file deletion, but that's probably better handled
1916 * by a special case.
1918 * This function is recursive. For levels > 0 the function is called again on
1919 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1920 * If there is no data in a subtree then it is pruned.
1923 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1924 __u32 level, int del0)
1933 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1934 if (tn->internal[i]) {
1936 yaffs_PruneWorker(dev, tn->internal[i],
1938 (i == 0) ? del0 : 1);
1941 if (tn->internal[i])
1945 int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
1946 __u32 *map = (__u32 *)tn;
1948 for(i = 0; !hasData && i < tnodeSize_u32; i++){
1954 if (hasData == 0 && del0) {
1955 /* Free and return NULL */
1957 yaffs_FreeTnode(dev, tn);
1967 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1968 yaffs_FileStructure *fStruct)
1975 if (fStruct->topLevel > 0) {
1977 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1979 /* Now we have a tree with all the non-zero branches NULL but the height
1980 * is the same as it was.
1981 * Let's see if we can trim internal tnodes to shorten the tree.
1982 * We can do this if only the 0th element in the tnode is in use
1983 * (ie all the non-zero are NULL)
1986 while (fStruct->topLevel && !done) {
1990 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1991 if (tn->internal[i])
1996 fStruct->top = tn->internal[0];
1997 fStruct->topLevel--;
1998 yaffs_FreeTnode(dev, tn);
2008 /*-------------------- End of File Structure functions.-------------------*/
2010 /* yaffs_CreateFreeObjects creates a bunch more objects and
2011 * adds them to the object free list.
2013 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
2016 yaffs_Object *newObjects;
2017 yaffs_ObjectList *list;
2022 /* make these things */
2023 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
2024 list = YMALLOC(sizeof(yaffs_ObjectList));
2026 if (!newObjects || !list) {
2035 T(YAFFS_TRACE_ALLOCATE,
2036 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
2040 /* Hook them into the free list */
2041 for (i = 0; i < nObjects - 1; i++) {
2042 newObjects[i].siblings.next =
2043 (struct ylist_head *)(&newObjects[i + 1]);
2046 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
2047 dev->freeObjects = newObjects;
2048 dev->nFreeObjects += nObjects;
2049 dev->nObjectsCreated += nObjects;
2051 /* Now add this bunch of Objects to a list for freeing up. */
2053 list->objects = newObjects;
2054 list->next = dev->allocatedObjectList;
2055 dev->allocatedObjectList = list;
2061 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
2062 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
2064 yaffs_Object *tn = NULL;
2066 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2067 tn = YMALLOC(sizeof(yaffs_Object));
2069 dev->nObjectsCreated++;
2071 /* If there are none left make more */
2072 if (!dev->freeObjects)
2073 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
2075 if (dev->freeObjects) {
2076 tn = dev->freeObjects;
2078 (yaffs_Object *) (dev->freeObjects->siblings.next);
2079 dev->nFreeObjects--;
2083 /* Now sweeten it up... */
2085 memset(tn, 0, sizeof(yaffs_Object));
2086 tn->beingCreated = 1;
2090 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
2091 YINIT_LIST_HEAD(&(tn->hardLinks));
2092 YINIT_LIST_HEAD(&(tn->hashLink));
2093 YINIT_LIST_HEAD(&tn->siblings);
2096 /* Now make the directory sane */
2098 tn->parent = dev->rootDir;
2099 ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
2102 /* Add it to the lost and found directory.
2103 * NB Can't put root or lostNFound in lostNFound so
2104 * check if lostNFound exists first
2106 if (dev->lostNFoundDir)
2107 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
2109 tn->beingCreated = 0;
2112 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2117 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
2122 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
2124 obj->fake = 1; /* it is fake so it might have no NAND presence... */
2125 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
2126 obj->unlinkAllowed = 0; /* ... or unlink it */
2129 obj->yst_mode = mode;
2131 obj->hdrChunk = 0; /* Not a valid chunk. */
2138 static void yaffs_UnhashObject(yaffs_Object *tn)
2141 yaffs_Device *dev = tn->myDev;
2143 /* If it is still linked into the bucket list, free from the list */
2144 if (!ylist_empty(&tn->hashLink)) {
2145 ylist_del_init(&tn->hashLink);
2146 bucket = yaffs_HashFunction(tn->objectId);
2147 dev->objectBucket[bucket].count--;
2151 /* FreeObject frees up a Object and puts it back on the free list */
2152 static void yaffs_FreeObject(yaffs_Object *tn)
2154 yaffs_Device *dev = tn->myDev;
2156 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
2162 if (!ylist_empty(&tn->siblings))
2167 /* We're still hooked up to a cached inode.
2168 * Don't delete now, but mark for later deletion
2170 tn->deferedFree = 1;
2174 yaffs_UnhashObject(tn);
2176 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2178 dev->nObjectsCreated--;
2181 /* Link into the free list. */
2182 tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2183 dev->freeObjects = tn;
2184 dev->nFreeObjects++;
2186 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2190 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2192 if (obj->deferedFree)
2193 yaffs_FreeObject(obj);
2197 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2199 /* Free the list of allocated Objects */
2201 yaffs_ObjectList *tmp;
2203 while (dev->allocatedObjectList) {
2204 tmp = dev->allocatedObjectList->next;
2205 YFREE(dev->allocatedObjectList->objects);
2206 YFREE(dev->allocatedObjectList);
2208 dev->allocatedObjectList = tmp;
2211 dev->freeObjects = NULL;
2212 dev->nFreeObjects = 0;
2213 dev->nObjectsCreated = 0;
2216 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2220 dev->allocatedObjectList = NULL;
2221 dev->freeObjects = NULL;
2222 dev->nFreeObjects = 0;
2224 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2225 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2226 dev->objectBucket[i].count = 0;
2230 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2234 int lowest = 999999;
2237 /* Search for the shortest list or one that
2241 for (i = 0; i < 10 && lowest > 4; i++) {
2242 dev->bucketFinder++;
2243 dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
2244 if (dev->objectBucket[dev->bucketFinder].count < lowest) {
2245 lowest = dev->objectBucket[dev->bucketFinder].count;
2246 l = dev->bucketFinder;
2254 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2256 int bucket = yaffs_FindNiceObjectBucket(dev);
2258 /* Now find an object value that has not already been taken
2259 * by scanning the list.
2263 struct ylist_head *i;
2265 __u32 n = (__u32) bucket;
2267 /* yaffs_CheckObjectHashSanity(); */
2271 n += YAFFS_NOBJECT_BUCKETS;
2272 if (1 || dev->objectBucket[bucket].count > 0) {
2273 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2274 /* If there is already one in the list */
2275 if (i && ylist_entry(i, yaffs_Object,
2276 hashLink)->objectId == n) {
2286 static void yaffs_HashObject(yaffs_Object *in)
2288 int bucket = yaffs_HashFunction(in->objectId);
2289 yaffs_Device *dev = in->myDev;
2291 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2292 dev->objectBucket[bucket].count++;
2295 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2297 int bucket = yaffs_HashFunction(number);
2298 struct ylist_head *i;
2301 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2302 /* Look if it is in the list */
2304 in = ylist_entry(i, yaffs_Object, hashLink);
2305 if (in->objectId == number) {
2307 /* Don't tell the VFS about this one if it is defered free */
2308 if (in->deferedFree)
2319 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2320 yaffs_ObjectType type)
2322 yaffs_Object *theObject=NULL;
2323 yaffs_Tnode *tn = NULL;
2326 number = yaffs_CreateNewObjectNumber(dev);
2328 if (type == YAFFS_OBJECT_TYPE_FILE) {
2329 tn = yaffs_GetTnode(dev);
2334 theObject = yaffs_AllocateEmptyObject(dev);
2337 yaffs_FreeTnode(dev,tn);
2343 theObject->fake = 0;
2344 theObject->renameAllowed = 1;
2345 theObject->unlinkAllowed = 1;
2346 theObject->objectId = number;
2347 yaffs_HashObject(theObject);
2348 theObject->variantType = type;
2349 #ifdef CONFIG_YAFFS_WINCE
2350 yfsd_WinFileTimeNow(theObject->win_atime);
2351 theObject->win_ctime[0] = theObject->win_mtime[0] =
2352 theObject->win_atime[0];
2353 theObject->win_ctime[1] = theObject->win_mtime[1] =
2354 theObject->win_atime[1];
2358 theObject->yst_atime = theObject->yst_mtime =
2359 theObject->yst_ctime = Y_CURRENT_TIME;
2362 case YAFFS_OBJECT_TYPE_FILE:
2363 theObject->variant.fileVariant.fileSize = 0;
2364 theObject->variant.fileVariant.scannedFileSize = 0;
2365 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2366 theObject->variant.fileVariant.topLevel = 0;
2367 theObject->variant.fileVariant.top = tn;
2369 case YAFFS_OBJECT_TYPE_DIRECTORY:
2370 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2372 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2375 case YAFFS_OBJECT_TYPE_SYMLINK:
2376 case YAFFS_OBJECT_TYPE_HARDLINK:
2377 case YAFFS_OBJECT_TYPE_SPECIAL:
2378 /* No action required */
2380 case YAFFS_OBJECT_TYPE_UNKNOWN:
2381 /* todo this should not happen */
2389 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2391 yaffs_ObjectType type)
2393 yaffs_Object *theObject = NULL;
2396 theObject = yaffs_FindObjectByNumber(dev, number);
2399 theObject = yaffs_CreateNewObject(dev, number, type);
2406 static YCHAR *yaffs_CloneString(const YCHAR *str)
2408 YCHAR *newStr = NULL;
2414 len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
2415 newStr = YMALLOC((len + 1) * sizeof(YCHAR));
2417 yaffs_strncpy(newStr, str,len);
2425 * Mknod (create) a new object.
2426 * equivalentObject only has meaning for a hard link;
2427 * aliasString only has meaning for a symlink.
2428 * rdev only has meaning for devices (a subset of special objects)
2431 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2432 yaffs_Object *parent,
2437 yaffs_Object *equivalentObject,
2438 const YCHAR *aliasString, __u32 rdev)
2443 yaffs_Device *dev = parent->myDev;
2445 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2446 if (yaffs_FindObjectByName(parent, name))
2449 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2450 str = yaffs_CloneString(aliasString);
2455 in = yaffs_CreateNewObject(dev, -1, type);
2470 in->variantType = type;
2472 in->yst_mode = mode;
2474 #ifdef CONFIG_YAFFS_WINCE
2475 yfsd_WinFileTimeNow(in->win_atime);
2476 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2477 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2480 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2482 in->yst_rdev = rdev;
2486 in->nDataChunks = 0;
2488 yaffs_SetObjectName(in, name);
2491 yaffs_AddObjectToDirectory(parent, in);
2493 in->myDev = parent->myDev;
2496 case YAFFS_OBJECT_TYPE_SYMLINK:
2497 in->variant.symLinkVariant.alias = str;
2499 case YAFFS_OBJECT_TYPE_HARDLINK:
2500 in->variant.hardLinkVariant.equivalentObject =
2502 in->variant.hardLinkVariant.equivalentObjectId =
2503 equivalentObject->objectId;
2504 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2506 case YAFFS_OBJECT_TYPE_FILE:
2507 case YAFFS_OBJECT_TYPE_DIRECTORY:
2508 case YAFFS_OBJECT_TYPE_SPECIAL:
2509 case YAFFS_OBJECT_TYPE_UNKNOWN:
2514 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2515 /* Could not create the object header, fail the creation */
2516 yaffs_DeleteObject(in);
2520 yaffs_UpdateParent(parent);
2526 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2527 __u32 mode, __u32 uid, __u32 gid)
2529 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2530 uid, gid, NULL, NULL, 0);
2533 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2534 __u32 mode, __u32 uid, __u32 gid)
2536 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2537 mode, uid, gid, NULL, NULL, 0);
2540 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2541 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2543 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2544 uid, gid, NULL, NULL, rdev);
2547 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2548 __u32 mode, __u32 uid, __u32 gid,
2551 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2552 uid, gid, NULL, alias, 0);
2555 /* yaffs_Link returns the object id of the equivalent object.*/
2556 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2557 yaffs_Object *equivalentObject)
2559 /* Get the real object in case we were fed a hard link as an equivalent object */
2560 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2562 if (yaffs_MknodObject
2563 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2564 equivalentObject, NULL, 0)) {
2565 return equivalentObject;
2572 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2573 const YCHAR *newName, int force, int shadows)
2578 yaffs_Object *existingTarget;
2581 newDir = obj->parent; /* use the old directory */
2583 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2584 T(YAFFS_TRACE_ALWAYS,
2586 ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2591 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2592 if (obj->myDev->param.isYaffs2)
2593 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2595 unlinkOp = (newDir == obj->myDev->unlinkedDir
2596 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2598 deleteOp = (newDir == obj->myDev->deletedDir);
2600 existingTarget = yaffs_FindObjectByName(newDir, newName);
2602 /* If the object is a file going into the unlinked directory,
2603 * then it is OK to just stuff it in since duplicate names are allowed.
2604 * else only proceed if the new name does not exist and if we're putting
2605 * it into a directory.
2612 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2613 yaffs_SetObjectName(obj, newName);
2616 yaffs_AddObjectToDirectory(newDir, obj);
2621 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2622 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2629 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2630 yaffs_Object *newDir, const YCHAR *newName)
2632 yaffs_Object *obj = NULL;
2633 yaffs_Object *existingTarget = NULL;
2639 if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2641 if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2644 dev = oldDir->myDev;
2646 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2647 /* Special case for case insemsitive systems (eg. WinCE).
2648 * While look-up is case insensitive, the name isn't.
2649 * Therefore we might want to change x.txt to X.txt
2651 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2655 if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
2659 obj = yaffs_FindObjectByName(oldDir, oldName);
2661 if (obj && obj->renameAllowed) {
2663 /* Now do the handling for an existing target, if there is one */
2665 existingTarget = yaffs_FindObjectByName(newDir, newName);
2666 if (existingTarget &&
2667 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2668 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2669 /* There is a target that is a non-empty directory, so we fail */
2670 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2671 } else if (existingTarget && existingTarget != obj) {
2672 /* Nuke the target first, using shadowing,
2673 * but only if it isn't the same object.
2675 * Note we must disable gc otherwise it can mess up the shadowing.
2679 yaffs_ChangeObjectName(obj, newDir, newName, force,
2680 existingTarget->objectId);
2681 existingTarget->isShadowed = 1;
2682 yaffs_UnlinkObject(existingTarget);
2686 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2688 yaffs_UpdateParent(oldDir);
2689 if(newDir != oldDir)
2690 yaffs_UpdateParent(newDir);
2697 /*------------------------- Block Management and Page Allocation ----------------*/
2699 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2701 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2703 dev->blockInfo = NULL;
2704 dev->chunkBits = NULL;
2706 dev->allocationBlock = -1; /* force it to get a new one */
2708 /* If the first allocation strategy fails, thry the alternate one */
2709 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2710 if (!dev->blockInfo) {
2711 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2712 dev->blockInfoAlt = 1;
2714 dev->blockInfoAlt = 0;
2716 if (dev->blockInfo) {
2717 /* Set up dynamic blockinfo stuff. */
2718 dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
2719 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2720 if (!dev->chunkBits) {
2721 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2722 dev->chunkBitsAlt = 1;
2724 dev->chunkBitsAlt = 0;
2727 if (dev->blockInfo && dev->chunkBits) {
2728 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2729 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2736 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2738 if (dev->blockInfoAlt && dev->blockInfo)
2739 YFREE_ALT(dev->blockInfo);
2740 else if (dev->blockInfo)
2741 YFREE(dev->blockInfo);
2743 dev->blockInfoAlt = 0;
2745 dev->blockInfo = NULL;
2747 if (dev->chunkBitsAlt && dev->chunkBits)
2748 YFREE_ALT(dev->chunkBits);
2749 else if (dev->chunkBits)
2750 YFREE(dev->chunkBits);
2751 dev->chunkBitsAlt = 0;
2752 dev->chunkBits = NULL;
2755 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2756 yaffs_BlockInfo *bi)
2759 if (!dev->param.isYaffs2)
2760 return 1; /* disqualification only applies to yaffs2. */
2762 if (!bi->hasShrinkHeader)
2763 return 1; /* can gc */
2765 yaffs_FindOldestDirtySequence(dev);
2767 /* Can't do gc of this block if there are any blocks older than this one that have
2770 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2774 * yaffs_FindRefreshBlock()
2775 * periodically finds the oldest full block by sequence number for refreshing.
2778 static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev)
2783 __u32 oldestSequence = 0;
2785 yaffs_BlockInfo *bi;
2788 * If refresh period < 10 then refreshing is disabled.
2790 if(dev->param.refreshPeriod < 10 ||
2791 !dev->param.isYaffs2)
2795 * Fix broken values.
2797 if(dev->refreshSkip > dev->param.refreshPeriod)
2798 dev->refreshSkip = dev->param.refreshPeriod;
2800 if(dev->refreshSkip > 0)
2804 * Refresh skip is now zero.
2805 * We'll do a refresh this time around....
2806 * Update the refresh skip and find the oldest block.
2808 dev->refreshSkip = dev->param.refreshPeriod;
2809 dev->refreshCount++;
2810 bi = dev->blockInfo;
2811 for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
2813 if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
2816 bi->sequenceNumber < oldestSequence){
2818 oldestSequence = bi->sequenceNumber;
2826 (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
2827 dev->refreshCount, oldest, oldestSequence));
2834 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2836 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2840 /* If the block is still healthy erase it and mark as clean.
2841 * If the block has had a data failure, then retire it.
2844 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2845 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2846 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2848 yaffs_ClearOldestDirtySequence(dev,bi);
2850 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2852 /* If this is the block being garbage collected then stop gc'ing this block */
2853 if(blockNo == dev->gcBlock)
2856 /* If this block is currently the best candidate for gc then drop as a candidate */
2857 if(blockNo == dev->gcDirtiest){
2858 dev->gcDirtiest = 0;
2859 dev->gcPagesInUse = 0;
2862 if (!bi->needsRetiring) {
2863 yaffs_InvalidateCheckpoint(dev);
2864 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2866 dev->nErasureFailures++;
2867 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2868 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2873 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2875 for (i = 0; i < dev->param.nChunksPerBlock; i++) {
2876 if (!yaffs_CheckChunkErased
2877 (dev, blockNo * dev->param.nChunksPerBlock + i)) {
2878 T(YAFFS_TRACE_ERROR,
2880 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2881 TENDSTR), blockNo, i));
2887 /* Clean it up... */
2888 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2889 bi->sequenceNumber = 0;
2890 dev->nErasedBlocks++;
2892 bi->softDeletions = 0;
2893 bi->hasShrinkHeader = 0;
2894 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2895 bi->gcPrioritise = 0;
2896 yaffs_ClearChunkBits(dev, blockNo);
2898 T(YAFFS_TRACE_ERASE,
2899 (TSTR("Erased block %d" TENDSTR), blockNo));
2901 dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
2903 yaffs_RetireBlock(dev, blockNo);
2904 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2905 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2909 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2913 yaffs_BlockInfo *bi;
2915 if (dev->nErasedBlocks < 1) {
2916 /* Hoosterman we've got a problem.
2917 * Can't get space to gc
2919 T(YAFFS_TRACE_ERROR,
2920 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2925 /* Find an empty block. */
2927 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2928 dev->allocationBlockFinder++;
2929 if (dev->allocationBlockFinder < dev->internalStartBlock
2930 || dev->allocationBlockFinder > dev->internalEndBlock) {
2931 dev->allocationBlockFinder = dev->internalStartBlock;
2934 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2936 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2937 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2938 dev->sequenceNumber++;
2939 bi->sequenceNumber = dev->sequenceNumber;
2940 dev->nErasedBlocks--;
2941 T(YAFFS_TRACE_ALLOCATE,
2942 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2943 dev->allocationBlockFinder, dev->sequenceNumber,
2944 dev->nErasedBlocks));
2945 return dev->allocationBlockFinder;
2949 T(YAFFS_TRACE_ALWAYS,
2951 ("yaffs tragedy: no more erased blocks, but there should have been %d"
2952 TENDSTR), dev->nErasedBlocks));
2959 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2961 if (!dev->nCheckpointBlocksRequired &&
2962 dev->param.isYaffs2) {
2963 /* Not a valid value so recalculate */
2966 int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
2967 int tnodeSize = yaffs_CalcTnodeSize(dev);
2969 nBytes += sizeof(yaffs_CheckpointValidity);
2970 nBytes += sizeof(yaffs_CheckpointDevice);
2971 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2972 nBytes += devBlocks * dev->chunkBitmapStride;
2973 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2974 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2975 nBytes += sizeof(yaffs_CheckpointValidity);
2976 nBytes += sizeof(__u32); /* checksum*/
2978 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2980 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
2982 dev->nCheckpointBlocksRequired = nBlocks;
2985 return dev->nCheckpointBlocksRequired;
2989 * Check if there's space to allocate...
2990 * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2992 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
2995 int reservedBlocks = dev->param.nReservedBlocks;
2996 int checkpointBlocks;
2998 if (dev->param.isYaffs2) {
2999 checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) -
3000 dev->blocksInCheckpoint;
3001 if (checkpointBlocks < 0)
3002 checkpointBlocks = 0;
3004 checkpointBlocks = 0;
3007 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
3009 return (dev->nFreeChunks > (reservedChunks + nChunks));
3012 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
3013 yaffs_BlockInfo **blockUsedPtr)
3016 yaffs_BlockInfo *bi;
3018 if (dev->allocationBlock < 0) {
3019 /* Get next block to allocate off */
3020 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
3021 dev->allocationPage = 0;
3024 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
3025 /* Not enough space to allocate unless we're allowed to use the reserve. */
3029 if (dev->nErasedBlocks < dev->param.nReservedBlocks
3030 && dev->allocationPage == 0) {
3031 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
3034 /* Next page please.... */
3035 if (dev->allocationBlock >= 0) {
3036 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3038 retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
3039 dev->allocationPage;
3041 yaffs_SetChunkBit(dev, dev->allocationBlock,
3042 dev->allocationPage);
3044 dev->allocationPage++;
3048 /* If the block is full set the state to full */
3049 if (dev->allocationPage >= dev->param.nChunksPerBlock) {
3050 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3051 dev->allocationBlock = -1;
3060 T(YAFFS_TRACE_ERROR,
3061 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3066 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3070 n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3072 if (dev->allocationBlock > 0)
3073 n += (dev->param.nChunksPerBlock - dev->allocationPage);
3080 * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3081 * if we don't want to write to it.
3083 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3085 if(dev->allocationBlock > 0){
3086 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3087 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3088 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3089 dev->allocationBlock = -1;
3095 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3101 int retVal = YAFFS_OK;
3104 int isCheckpointBlock;
3108 int chunksBefore = yaffs_GetErasedChunks(dev);
3111 yaffs_ExtendedTags tags;
3113 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3115 yaffs_Object *object;
3117 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3120 T(YAFFS_TRACE_TRACING,
3121 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3124 bi->hasShrinkHeader,
3127 /*yaffs_VerifyFreeChunks(dev); */
3129 if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3130 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3132 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
3136 if (isCheckpointBlock ||
3137 !yaffs_StillSomeChunkBits(dev, block)) {
3138 T(YAFFS_TRACE_TRACING,
3140 ("Collecting block %d that has no chunks in use" TENDSTR),
3142 yaffs_BlockBecameDirty(dev, block);
3145 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3147 yaffs_VerifyBlock(dev, bi, block);
3149 maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 5;
3150 oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
3152 for (/* init already done */;
3153 retVal == YAFFS_OK &&
3154 dev->gcChunk < dev->param.nChunksPerBlock &&
3155 (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3157 dev->gcChunk++, oldChunk++) {
3158 if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3160 /* This page is in use and might need to be copied off */
3166 yaffs_InitialiseTags(&tags);
3168 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3172 yaffs_FindObjectByNumber(dev,
3175 T(YAFFS_TRACE_GC_DETAIL,
3177 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3178 dev->gcChunk, tags.objectId, tags.chunkId,
3181 if (object && !yaffs_SkipVerification(dev)) {
3182 if (tags.chunkId == 0)
3183 matchingChunk = object->hdrChunk;
3184 else if (object->softDeleted)
3185 matchingChunk = oldChunk; /* Defeat the test */
3187 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3189 if (oldChunk != matchingChunk)
3190 T(YAFFS_TRACE_ERROR,
3191 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3192 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3197 T(YAFFS_TRACE_ERROR,
3199 ("page %d in gc has no object: %d %d %d "
3201 tags.objectId, tags.chunkId, tags.byteCount));
3206 object->softDeleted &&
3207 tags.chunkId != 0) {
3208 /* Data chunk in a soft deleted file, throw it away
3209 * It's a soft deleted data chunk,
3210 * No need to copy this, just forget about it and
3211 * fix up the object.
3214 /* Free chunks already includes softdeleted chunks.
3215 * How ever this chunk is going to soon be really deleted
3216 * which will increment free chunks.
3217 * We have to decrement free chunks so this works out properly.
3221 object->nDataChunks--;
3223 if (object->nDataChunks <= 0) {
3224 /* remeber to clean up the object */
3225 dev->gcCleanupList[cleanups] =
3231 /* Todo object && object->deleted && object->nDataChunks == 0 */
3232 /* Deleted object header with no data chunks.
3233 * Can be discarded and the file deleted.
3235 object->hdrChunk = 0;
3236 yaffs_FreeTnode(object->myDev,
3239 object->variant.fileVariant.top = NULL;
3240 yaffs_DoGenericObjectDeletion(object);
3242 } else if (object) {
3243 /* It's either a data chunk in a live file or
3244 * an ObjectHeader, so we're interested in it.
3245 * NB Need to keep the ObjectHeaders of deleted files
3246 * until the whole file has been deleted off
3248 tags.serialNumber++;
3252 if (tags.chunkId == 0) {
3253 /* It is an object Id,
3254 * We need to nuke the shrinkheader flags first
3255 * Also need to clean up shadowing.
3256 * We no longer want the shrinkHeader flag since its work is done
3257 * and if it is left in place it will mess up scanning.
3260 yaffs_ObjectHeader *oh;
3261 oh = (yaffs_ObjectHeader *)buffer;
3264 tags.extraIsShrinkHeader = 0;
3266 oh->shadowsObject = 0;
3267 oh->inbandShadowsObject = 0;
3268 tags.extraShadows = 0;
3270 /* Update file size */
3271 if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
3272 oh->fileSize = object->variant.fileVariant.fileSize;
3273 tags.extraFileLength = oh->fileSize;
3276 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3278 yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
3281 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3284 retVal = YAFFS_FAIL;
3287 /* Ok, now fix up the Tnodes etc. */
3289 if (tags.chunkId == 0) {
3291 object->hdrChunk = newChunk;
3292 object->serial = tags.serialNumber;
3294 /* It's a data chunk */
3296 ok = yaffs_PutChunkIntoFile
3304 if (retVal == YAFFS_OK)
3305 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3310 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3313 /* Do any required cleanups */
3314 for (i = 0; i < cleanups; i++) {
3315 /* Time to delete the file too */
3317 yaffs_FindObjectByNumber(dev,
3318 dev->gcCleanupList[i]);
3320 yaffs_FreeTnode(dev,
3321 object->variant.fileVariant.
3323 object->variant.fileVariant.top = NULL;
3326 ("yaffs: About to finally delete object %d"
3327 TENDSTR), object->objectId));
3328 yaffs_DoGenericObjectDeletion(object);
3329 object->myDev->nDeletedFiles--;
3336 yaffs_VerifyCollectedBlock(dev, bi, block);
3340 if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3342 * The gc did not complete. Set block state back to FULL
3343 * because checkpointing does not restore gc.
3345 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3347 /* The gc completed. */
3348 chunksAfter = yaffs_GetErasedChunks(dev);
3349 if (chunksBefore >= chunksAfter) {
3352 ("gc did not increase free chunks before %d after %d"
3353 TENDSTR), chunksBefore, chunksAfter));
3365 * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
3366 * for garbage collection.
3369 static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
3375 unsigned selected = 0;
3376 int prioritised = 0;
3377 int prioritisedExists = 0;
3378 yaffs_BlockInfo *bi;
3381 /* First let's see if we need to grab a prioritised block */
3382 if (dev->hasPendingPrioritisedGCs && !aggressive) {
3383 dev->gcDirtiest = 0;
3384 bi = dev->blockInfo;
3385 for (i = dev->internalStartBlock;
3386 i <= dev->internalEndBlock && !selected;
3389 if (bi->gcPrioritise) {
3390 prioritisedExists = 1;
3391 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
3392 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
3401 * If there is a prioritised block and none was selected then
3402 * this happened because there is at least one old dirty block gumming
3403 * up the works. Let's gc the oldest dirty block.
3406 if(prioritisedExists &&
3408 dev->oldestDirtyBlock > 0)
3409 selected = dev->oldestDirtyBlock;
3411 if (!prioritisedExists) /* None found, so we can clear this */
3412 dev->hasPendingPrioritisedGCs = 0;
3415 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
3417 * else (we're doing a leasurely gc), then we only bother to do this if the
3418 * block has only a few pages in use.
3423 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
3425 threshold = dev->param.nChunksPerBlock;
3426 iterations = nBlocks;
3428 int maxThreshold = dev->param.nChunksPerBlock/2;
3429 threshold = background ?
3430 (dev->gcNotDone + 2) * 2 : 0;
3431 threshold = max(threshold, YAFFS_GC_PASSIVE_THRESHOLD);
3432 threshold = min(threshold, maxThreshold);
3434 iterations = nBlocks / 16 + 1;
3435 if (iterations > 100)
3441 (dev->gcDirtiest < 1 ||
3442 dev->gcPagesInUse > YAFFS_GC_GOOD_ENOUGH);
3444 dev->gcBlockFinder++;
3445 if (dev->gcBlockFinder < dev->internalStartBlock ||
3446 dev->gcBlockFinder > dev->internalEndBlock)
3447 dev->gcBlockFinder = dev->internalStartBlock;
3449 bi = yaffs_GetBlockInfo(dev, dev->gcBlockFinder);
3451 pagesUsed = bi->pagesInUse - bi->softDeletions;
3453 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
3454 pagesUsed < dev->param.nChunksPerBlock &&
3455 (dev->gcDirtiest < 1 || pagesUsed < dev->gcPagesInUse) &&
3456 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
3457 dev->gcDirtiest = dev->gcBlockFinder;
3458 dev->gcPagesInUse = pagesUsed;
3462 if(dev->gcDirtiest > 0 && dev->gcPagesInUse <= threshold)
3463 selected = dev->gcDirtiest;
3466 if(!selected && dev->param.isYaffs2 && dev->gcNotDone >= ( background ? 10 : 20)){
3467 yaffs_FindOldestDirtySequence(dev);
3468 if(dev->oldestDirtyBlock > 0) {
3469 selected = dev->oldestDirtyBlock;
3470 dev->gcDirtiest = selected;
3471 bi = yaffs_GetBlockInfo(dev, selected);
3472 dev->gcPagesInUse = bi->pagesInUse - bi->softDeletions;
3479 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR),
3481 dev->param.nChunksPerBlock - dev->gcPagesInUse,
3484 dev->gcDirtiest = 0;
3485 dev->gcPagesInUse = 0;
3487 if(dev->refreshSkip > 0)
3492 (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR),
3493 dev->gcBlockFinder, dev->gcNotDone,
3495 dev->gcDirtiest, dev->gcPagesInUse,
3496 dev->oldestDirtyBlock,
3497 background ? " bg" : ""));
3503 /* New garbage collector
3504 * If we're very low on erased blocks then we do aggressive garbage collection
3505 * otherwise we do "leasurely" garbage collection.
3506 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3507 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3509 * The idea is to help clear out space in a more spread-out manner.
3510 * Dunno if it really does anything useful.
3512 static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
3515 int gcOk = YAFFS_OK;
3521 int checkpointBlockAdjust;
3523 if(dev->param.gcControl &&
3524 (dev->param.gcControl(dev) & 1) == 0)
3527 if (dev->gcDisable) {
3528 /* Bail out so we don't get recursive gc */
3532 /* This loop should pass the first time.
3533 * We'll only see looping here if the collection does not increase space.
3539 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3540 if (checkpointBlockAdjust < 0)
3541 checkpointBlockAdjust = 0;
3543 minErased = dev->param.nReservedBlocks + checkpointBlockAdjust + 1;
3544 erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3546 /* If we need a block soon then do aggressive gc.*/
3547 if (dev->nErasedBlocks < minErased)
3550 if(dev->gcSkip > 20)
3552 if(erasedChunks < dev->nFreeChunks/2 ||
3564 /* If we don't already have a block being gc'd then see if we should start another */
3566 if (dev->gcBlock < 1 && !aggressive) {
3567 dev->gcBlock = yaffs_FindRefreshBlock(dev);
3570 if (dev->gcBlock < 1) {
3571 dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive, background);
3575 if (dev->gcBlock > 0) {
3576 dev->garbageCollections++;
3578 dev->passiveGarbageCollections++;
3582 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3583 dev->nErasedBlocks, aggressive));
3585 gcOk = yaffs_GarbageCollectBlock(dev, dev->gcBlock, aggressive);
3588 if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && dev->gcBlock > 0) {
3591 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3592 TENDSTR), dev->nErasedBlocks, maxTries, dev->gcBlock));
3594 } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
3595 (dev->gcBlock > 0) &&
3598 return aggressive ? gcOk : YAFFS_OK;
3602 * yaffs_BackgroundGarbageCollect()
3603 * Garbage collects. Intended to be called from a background thread.
3604 * Returns non-zero if at least half the free chunks are erased.
3606 int yaffs_BackgroundGarbageCollect(yaffs_Device *dev)
3608 int erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3610 T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc" TENDSTR)));
3612 yaffs_CheckGarbageCollection(dev, 1);
3613 return erasedChunks > dev->nFreeChunks/2;
3616 /*------------------------- TAGS --------------------------------*/
3618 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3621 return (tags->chunkId == chunkInObject &&
3622 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3627 /*-------------------- Data file manipulation -----------------*/
3629 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3630 yaffs_ExtendedTags *tags)
3632 /*Get the Tnode, then get the level 0 offset chunk offset */
3635 yaffs_ExtendedTags localTags;
3638 yaffs_Device *dev = in->myDev;
3641 /* Passed a NULL, so use our own tags space */
3645 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3648 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3651 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3657 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3658 yaffs_ExtendedTags *tags)
3660 /* Get the Tnode, then get the level 0 offset chunk offset */
3663 yaffs_ExtendedTags localTags;
3665 yaffs_Device *dev = in->myDev;
3669 /* Passed a NULL, so use our own tags space */
3673 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3677 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3680 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3683 /* Delete the entry in the filestructure (if found) */
3685 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3691 #ifdef YAFFS_PARANOID
3693 static int yaffs_CheckFileSanity(yaffs_Object *in)
3701 yaffs_Tags localTags;
3702 yaffs_Tags *tags = &localTags;
3706 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3709 objId = in->objectId;
3710 fSize = in->variant.fileVariant.fileSize;
3712 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3714 for (chunk = 1; chunk <= nChunks; chunk++) {
3715 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3720 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3722 if (yaffs_CheckChunkBits
3723 (dev, theChunk / dev->param.nChunksPerBlock,
3724 theChunk % dev->param.nChunksPerBlock)) {
3726 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3730 (tags, in->objectId, chunk, chunkDeleted)) {
3740 /* T(("No level 0 found for %d\n", chunk)); */
3744 return failed ? YAFFS_FAIL : YAFFS_OK;
3749 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3750 int chunkInNAND, int inScan)
3752 /* NB inScan is zero unless scanning.
3753 * For forward scanning, inScan is > 0;
3754 * for backward scanning inScan is < 0
3756 * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3760 yaffs_Device *dev = in->myDev;
3762 yaffs_ExtendedTags existingTags;
3763 yaffs_ExtendedTags newTags;
3764 unsigned existingSerial, newSerial;
3766 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3767 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3768 * If it is not during Scanning then something went wrong!
3771 T(YAFFS_TRACE_ERROR,
3773 ("yaffs tragedy:attempt to put data chunk into a non-file"
3778 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3782 tn = yaffs_AddOrFindLevel0Tnode(dev,
3783 &in->variant.fileVariant,
3790 /* Dummy insert, bail now */
3793 existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3796 /* If we're scanning then we need to test for duplicates
3797 * NB This does not need to be efficient since it should only ever
3798 * happen when the power fails during a write, then only one
3799 * chunk should ever be affected.
3801 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3802 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3805 if (existingChunk > 0) {
3806 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3807 * thus we have to do a FindChunkInFile to get the real chunk id.
3809 * We have a duplicate now we need to decide which one to use:
3811 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3812 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3813 * YAFFS1: Get both sets of tags and compare serial numbers.
3817 /* Only do this for forward scanning */
3818 yaffs_ReadChunkWithTagsFromNAND(dev,
3822 /* Do a proper find */
3824 yaffs_FindChunkInFile(in, chunkInInode,
3828 if (existingChunk <= 0) {
3829 /*Hoosterman - how did this happen? */
3831 T(YAFFS_TRACE_ERROR,
3833 ("yaffs tragedy: existing chunk < 0 in scan"
3838 /* NB The deleted flags should be false, otherwise the chunks will
3839 * not be loaded during a scan
3843 newSerial = newTags.serialNumber;
3844 existingSerial = existingTags.serialNumber;
3848 (in->myDev->param.isYaffs2 ||
3849 existingChunk <= 0 ||
3850 ((existingSerial + 1) & 3) == newSerial)) {
3851 /* Forward scanning.
3853 * Delete the old one and drop through to update the tnode
3855 yaffs_DeleteChunk(dev, existingChunk, 1,
3858 /* Backward scanning or we want to use the existing one
3860 * Delete the new one and return early so that the tnode isn't changed
3862 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3870 if (existingChunk == 0)
3873 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3878 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3881 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3883 if (chunkInNAND >= 0)
3884 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3887 T(YAFFS_TRACE_NANDACCESS,
3888 (TSTR("Chunk %d not found zero instead" TENDSTR),
3890 /* get sane (zero) data if you read a hole */
3891 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3897 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3901 yaffs_ExtendedTags tags;
3902 yaffs_BlockInfo *bi;
3908 block = chunkId / dev->param.nChunksPerBlock;
3909 page = chunkId % dev->param.nChunksPerBlock;
3912 if (!yaffs_CheckChunkBit(dev, block, page))
3913 T(YAFFS_TRACE_VERIFY,
3914 (TSTR("Deleting invalid chunk %d"TENDSTR),
3917 bi = yaffs_GetBlockInfo(dev, block);
3919 yaffs_UpdateOldestDirtySequence(dev, block, bi);
3921 T(YAFFS_TRACE_DELETION,
3922 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3925 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
3927 yaffs_InitialiseTags(&tags);
3929 tags.chunkDeleted = 1;
3931 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3932 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3934 dev->nUnmarkedDeletions++;
3937 /* Pull out of the management area.
3938 * If the whole block became dirty, this will kick off an erasure.
3940 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3941 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3942 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3943 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3946 yaffs_ClearChunkBit(dev, block, page);
3950 if (bi->pagesInUse == 0 &&
3951 !bi->hasShrinkHeader &&
3952 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3953 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3954 yaffs_BlockBecameDirty(dev, block);
3961 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3962 const __u8 *buffer, int nBytes,
3965 /* Find old chunk Need to do this to get serial number
3966 * Write new one and patch into tree.
3967 * Invalidate old tags.
3971 yaffs_ExtendedTags prevTags;
3974 yaffs_ExtendedTags newTags;
3976 yaffs_Device *dev = in->myDev;
3978 yaffs_CheckGarbageCollection(dev,0);
3980 /* Get the previous chunk at this location in the file if it exists.
3981 * If it does not exist then put a zero into the tree. This creates
3982 * the tnode now, rather than later when it is harder to clean up.
3984 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3985 if(prevChunkId < 1 &&
3986 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
3989 /* Set up new tags */
3990 yaffs_InitialiseTags(&newTags);
3992 newTags.chunkId = chunkInInode;
3993 newTags.objectId = in->objectId;
3994 newTags.serialNumber =
3995 (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3996 newTags.byteCount = nBytes;
3998 if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
3999 T(YAFFS_TRACE_ERROR,
4000 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
4006 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
4009 if (newChunkId > 0) {
4010 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
4012 if (prevChunkId > 0)
4013 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
4015 yaffs_CheckFileSanity(in);
4021 /* UpdateObjectHeader updates the header on NAND for an object.
4022 * If name is not NULL, then that new name is used.
4024 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
4025 int isShrink, int shadows)
4028 yaffs_BlockInfo *bi;
4030 yaffs_Device *dev = in->myDev;
4037 yaffs_ExtendedTags newTags;
4038 yaffs_ExtendedTags oldTags;
4039 YCHAR *alias = NULL;
4041 __u8 *buffer = NULL;
4042 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
4044 yaffs_ObjectHeader *oh = NULL;
4046 yaffs_strcpy(oldName, _Y("silly old name"));
4050 in == dev->rootDir || /* The rootDir should also be saved */
4053 yaffs_CheckGarbageCollection(dev,0);
4054 yaffs_CheckObjectDetailsLoaded(in);
4056 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
4057 oh = (yaffs_ObjectHeader *) buffer;
4059 prevChunkId = in->hdrChunk;
4061 if (prevChunkId > 0) {
4062 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
4065 yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
4067 memcpy(oldName, oh->name, sizeof(oh->name));
4070 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
4072 oh->type = in->variantType;
4073 oh->yst_mode = in->yst_mode;
4074 oh->shadowsObject = oh->inbandShadowsObject = shadows;
4076 #ifdef CONFIG_YAFFS_WINCE
4077 oh->win_atime[0] = in->win_atime[0];
4078 oh->win_ctime[0] = in->win_ctime[0];
4079 oh->win_mtime[0] = in->win_mtime[0];
4080 oh->win_atime[1] = in->win_atime[1];
4081 oh->win_ctime[1] = in->win_ctime[1];
4082 oh->win_mtime[1] = in->win_mtime[1];
4084 oh->yst_uid = in->yst_uid;
4085 oh->yst_gid = in->yst_gid;
4086 oh->yst_atime = in->yst_atime;
4087 oh->yst_mtime = in->yst_mtime;
4088 oh->yst_ctime = in->yst_ctime;
4089 oh->yst_rdev = in->yst_rdev;
4092 oh->parentObjectId = in->parent->objectId;
4094 oh->parentObjectId = 0;
4096 if (name && *name) {
4097 memset(oh->name, 0, sizeof(oh->name));
4098 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
4099 } else if (prevChunkId > 0)
4100 memcpy(oh->name, oldName, sizeof(oh->name));
4102 memset(oh->name, 0, sizeof(oh->name));
4104 oh->isShrink = isShrink;
4106 switch (in->variantType) {
4107 case YAFFS_OBJECT_TYPE_UNKNOWN:
4108 /* Should not happen */
4110 case YAFFS_OBJECT_TYPE_FILE:
4112 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
4113 || oh->parentObjectId ==
4114 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
4115 fileVariant.fileSize;
4117 case YAFFS_OBJECT_TYPE_HARDLINK:
4118 oh->equivalentObjectId =
4119 in->variant.hardLinkVariant.equivalentObjectId;
4121 case YAFFS_OBJECT_TYPE_SPECIAL:
4124 case YAFFS_OBJECT_TYPE_DIRECTORY:
4127 case YAFFS_OBJECT_TYPE_SYMLINK:
4128 alias = in->variant.symLinkVariant.alias;
4130 alias = _Y("no alias");
4131 yaffs_strncpy(oh->alias,
4133 YAFFS_MAX_ALIAS_LENGTH);
4134 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
4139 yaffs_InitialiseTags(&newTags);
4141 newTags.chunkId = 0;
4142 newTags.objectId = in->objectId;
4143 newTags.serialNumber = in->serial;
4145 /* Add extra info for file header */
4147 newTags.extraHeaderInfoAvailable = 1;
4148 newTags.extraParentObjectId = oh->parentObjectId;
4149 newTags.extraFileLength = oh->fileSize;
4150 newTags.extraIsShrinkHeader = oh->isShrink;
4151 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
4152 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
4153 newTags.extraObjectType = in->variantType;
4155 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
4157 /* Create new chunk in NAND */
4159 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
4160 (prevChunkId > 0) ? 1 : 0);
4162 if (newChunkId >= 0) {
4164 in->hdrChunk = newChunkId;
4166 if (prevChunkId > 0) {
4167 yaffs_DeleteChunk(dev, prevChunkId, 1,
4171 if (!yaffs_ObjectHasCachedWriteData(in))
4174 /* If this was a shrink, then mark the block that the chunk lives on */
4176 bi = yaffs_GetBlockInfo(in->myDev,
4177 newChunkId / in->myDev->param.nChunksPerBlock);
4178 bi->hasShrinkHeader = 1;
4183 retVal = newChunkId;
4188 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
4193 /*------------------------ Short Operations Cache ----------------------------------------
4194 * In many situations where there is no high level buffering (eg WinCE) a lot of
4195 * reads might be short sequential reads, and a lot of writes may be short
4196 * sequential writes. eg. scanning/writing a jpeg file.
4197 * In these cases, a short read/write cache can provide a huge perfomance benefit
4198 * with dumb-as-a-rock code.
4199 * In Linux, the page cache provides read buffering aand the short op cache provides write
4202 * There are a limited number (~10) of cache chunks per device so that we don't
4203 * need a very intelligent search.
4206 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
4208 yaffs_Device *dev = obj->myDev;
4210 yaffs_ChunkCache *cache;
4211 int nCaches = obj->myDev->param.nShortOpCaches;
4213 for (i = 0; i < nCaches; i++) {
4214 cache = &dev->srCache[i];
4215 if (cache->object == obj &&
4224 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
4226 yaffs_Device *dev = obj->myDev;
4227 int lowest = -99; /* Stop compiler whining. */
4229 yaffs_ChunkCache *cache;
4230 int chunkWritten = 0;
4231 int nCaches = obj->myDev->param.nShortOpCaches;
4237 /* Find the dirty cache for this object with the lowest chunk id. */
4238 for (i = 0; i < nCaches; i++) {
4239 if (dev->srCache[i].object == obj &&
4240 dev->srCache[i].dirty) {
4242 || dev->srCache[i].chunkId <
4244 cache = &dev->srCache[i];
4245 lowest = cache->chunkId;
4250 if (cache && !cache->locked) {
4251 /* Write it out and free it up */
4254 yaffs_WriteChunkDataToObject(cache->object,
4260 cache->object = NULL;
4263 } while (cache && chunkWritten > 0);
4266 /* Hoosterman, disk full while writing cache out. */
4267 T(YAFFS_TRACE_ERROR,
4268 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4275 /*yaffs_FlushEntireDeviceCache(dev)
4280 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4283 int nCaches = dev->param.nShortOpCaches;
4286 /* Find a dirty object in the cache and flush it...
4287 * until there are no further dirty objects.
4291 for (i = 0; i < nCaches && !obj; i++) {
4292 if (dev->srCache[i].object &&
4293 dev->srCache[i].dirty)
4294 obj = dev->srCache[i].object;
4298 yaffs_FlushFilesChunkCache(obj);
4305 /* Grab us a cache chunk for use.
4306 * First look for an empty one.
4307 * Then look for the least recently used non-dirty one.
4308 * Then look for the least recently used dirty one...., flush and look again.
4310 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4314 if (dev->param.nShortOpCaches > 0) {
4315 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4316 if (!dev->srCache[i].object)
4317 return &dev->srCache[i];
4324 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4326 yaffs_ChunkCache *cache;
4327 yaffs_Object *theObj;
4332 if (dev->param.nShortOpCaches > 0) {
4333 /* Try find a non-dirty one... */
4335 cache = yaffs_GrabChunkCacheWorker(dev);
4338 /* They were all dirty, find the last recently used object and flush
4339 * its cache, then find again.
4340 * NB what's here is not very accurate, we actually flush the object
4341 * the last recently used page.
4344 /* With locking we can't assume we can use entry zero */
4351 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4352 if (dev->srCache[i].object &&
4353 !dev->srCache[i].locked &&
4354 (dev->srCache[i].lastUse < usage || !cache)) {
4355 usage = dev->srCache[i].lastUse;
4356 theObj = dev->srCache[i].object;
4357 cache = &dev->srCache[i];
4362 if (!cache || cache->dirty) {
4363 /* Flush and try again */
4364 yaffs_FlushFilesChunkCache(theObj);
4365 cache = yaffs_GrabChunkCacheWorker(dev);
4375 /* Find a cached chunk */
4376 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4379 yaffs_Device *dev = obj->myDev;
4381 if (dev->param.nShortOpCaches > 0) {
4382 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4383 if (dev->srCache[i].object == obj &&
4384 dev->srCache[i].chunkId == chunkId) {
4387 return &dev->srCache[i];
4394 /* Mark the chunk for the least recently used algorithym */
4395 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4399 if (dev->param.nShortOpCaches > 0) {
4400 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4401 /* Reset the cache usages */
4403 for (i = 1; i < dev->param.nShortOpCaches; i++)
4404 dev->srCache[i].lastUse = 0;
4411 cache->lastUse = dev->srLastUse;
4418 /* Invalidate a single cache page.
4419 * Do this when a whole page gets written,
4420 * ie the short cache for this page is no longer valid.
4422 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4424 if (object->myDev->param.nShortOpCaches > 0) {
4425 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4428 cache->object = NULL;
4432 /* Invalidate all the cache pages associated with this object
4433 * Do this whenever ther file is deleted or resized.
4435 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4438 yaffs_Device *dev = in->myDev;
4440 if (dev->param.nShortOpCaches > 0) {
4441 /* Invalidate it. */
4442 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4443 if (dev->srCache[i].object == in)
4444 dev->srCache[i].object = NULL;
4449 /*--------------------- Checkpointing --------------------*/
4452 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4454 yaffs_CheckpointValidity cp;
4456 memset(&cp, 0, sizeof(cp));
4458 cp.structType = sizeof(cp);
4459 cp.magic = YAFFS_MAGIC;
4460 cp.version = YAFFS_CHECKPOINT_VERSION;
4461 cp.head = (head) ? 1 : 0;
4463 return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4467 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4469 yaffs_CheckpointValidity cp;
4472 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4475 ok = (cp.structType == sizeof(cp)) &&
4476 (cp.magic == YAFFS_MAGIC) &&
4477 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4478 (cp.head == ((head) ? 1 : 0));
4482 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4485 cp->nErasedBlocks = dev->nErasedBlocks;
4486 cp->allocationBlock = dev->allocationBlock;
4487 cp->allocationPage = dev->allocationPage;
4488 cp->nFreeChunks = dev->nFreeChunks;
4490 cp->nDeletedFiles = dev->nDeletedFiles;
4491 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4492 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4493 cp->sequenceNumber = dev->sequenceNumber;
4497 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4498 yaffs_CheckpointDevice *cp)
4500 dev->nErasedBlocks = cp->nErasedBlocks;
4501 dev->allocationBlock = cp->allocationBlock;
4502 dev->allocationPage = cp->allocationPage;
4503 dev->nFreeChunks = cp->nFreeChunks;
4505 dev->nDeletedFiles = cp->nDeletedFiles;
4506 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4507 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4508 dev->sequenceNumber = cp->sequenceNumber;
4512 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4514 yaffs_CheckpointDevice cp;
4516 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4520 /* Write device runtime values*/
4521 yaffs_DeviceToCheckpointDevice(&cp, dev);
4522 cp.structType = sizeof(cp);
4524 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4526 /* Write block info */
4528 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4529 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4532 /* Write chunk bits */
4534 nBytes = nBlocks * dev->chunkBitmapStride;
4535 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4541 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4543 yaffs_CheckpointDevice cp;
4545 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4549 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4553 if (cp.structType != sizeof(cp))
4557 yaffs_CheckpointDeviceToDevice(dev, &cp);
4559 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4561 ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4565 nBytes = nBlocks * dev->chunkBitmapStride;
4567 ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4572 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4576 cp->objectId = obj->objectId;
4577 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4578 cp->hdrChunk = obj->hdrChunk;
4579 cp->variantType = obj->variantType;
4580 cp->deleted = obj->deleted;
4581 cp->softDeleted = obj->softDeleted;
4582 cp->unlinked = obj->unlinked;
4583 cp->fake = obj->fake;
4584 cp->renameAllowed = obj->renameAllowed;
4585 cp->unlinkAllowed = obj->unlinkAllowed;
4586 cp->serial = obj->serial;
4587 cp->nDataChunks = obj->nDataChunks;
4589 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4590 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4591 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4592 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4595 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4598 yaffs_Object *parent;
4600 if (obj->variantType != cp->variantType) {
4601 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4602 TCONT("chunk %d does not match existing object type %d")
4603 TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4608 obj->objectId = cp->objectId;
4611 parent = yaffs_FindOrCreateObjectByNumber(
4614 YAFFS_OBJECT_TYPE_DIRECTORY);
4619 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4620 T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4621 TCONT(" chunk %d Parent type, %d, not directory")
4623 cp->objectId, cp->parentId, cp->variantType,
4624 cp->hdrChunk, parent->variantType));
4627 yaffs_AddObjectToDirectory(parent, obj);
4630 obj->hdrChunk = cp->hdrChunk;
4631 obj->variantType = cp->variantType;
4632 obj->deleted = cp->deleted;
4633 obj->softDeleted = cp->softDeleted;
4634 obj->unlinked = cp->unlinked;
4635 obj->fake = cp->fake;
4636 obj->renameAllowed = cp->renameAllowed;
4637 obj->unlinkAllowed = cp->unlinkAllowed;
4638 obj->serial = cp->serial;
4639 obj->nDataChunks = cp->nDataChunks;
4641 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4642 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4643 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4644 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4646 if (obj->hdrChunk > 0)
4647 obj->lazyLoaded = 1;
4653 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4654 __u32 level, int chunkOffset)
4657 yaffs_Device *dev = in->myDev;
4659 int tnodeSize = yaffs_CalcTnodeSize(dev);
4664 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4665 if (tn->internal[i]) {
4666 ok = yaffs_CheckpointTnodeWorker(in,
4669 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4672 } else if (level == 0) {
4673 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4674 ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4676 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4684 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4686 __u32 endMarker = ~0;
4689 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4690 ok = yaffs_CheckpointTnodeWorker(obj,
4691 obj->variant.fileVariant.top,
4692 obj->variant.fileVariant.topLevel,
4695 ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4702 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4706 yaffs_Device *dev = obj->myDev;
4707 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4710 int tnodeSize = yaffs_CalcTnodeSize(dev);
4712 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4714 while (ok && (~baseChunk)) {
4716 /* Read level 0 tnode */
4719 tn = yaffs_GetTnodeRaw(dev);
4721 ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4726 ok = yaffs_AddOrFindLevel0Tnode(dev,
4732 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4736 T(YAFFS_TRACE_CHECKPOINT, (
4737 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4738 nread, baseChunk, ok));
4744 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4747 yaffs_CheckpointObject cp;
4750 struct ylist_head *lh;
4753 /* Iterate through the objects in each hash entry,
4754 * dumping them to the checkpointing stream.
4757 for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
4758 ylist_for_each(lh, &dev->objectBucket[i].list) {
4760 obj = ylist_entry(lh, yaffs_Object, hashLink);
4761 if (!obj->deferedFree) {
4762 yaffs_ObjectToCheckpointObject(&cp, obj);
4763 cp.structType = sizeof(cp);
4765 T(YAFFS_TRACE_CHECKPOINT, (
4766 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4767 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4769 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4771 if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4772 ok = yaffs_WriteCheckpointTnodes(obj);
4778 /* Dump end of list */
4779 memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4780 cp.structType = sizeof(cp);
4783 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4788 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4791 yaffs_CheckpointObject cp;
4794 yaffs_Object *hardList = NULL;
4796 while (ok && !done) {
4797 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4798 if (cp.structType != sizeof(cp)) {
4799 T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4800 cp.structType, (int)sizeof(cp), ok));
4804 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4805 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4807 if (ok && cp.objectId == ~0)
4810 obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4812 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4815 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4816 ok = yaffs_ReadCheckpointTnodes(obj);
4817 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4818 obj->hardLinks.next =
4819 (struct ylist_head *) hardList;
4828 yaffs_HardlinkFixup(dev, hardList);
4833 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4835 __u32 checkpointSum;
4838 yaffs_GetCheckpointSum(dev, &checkpointSum);
4840 ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4848 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4850 __u32 checkpointSum0;
4851 __u32 checkpointSum1;
4854 yaffs_GetCheckpointSum(dev, &checkpointSum0);
4856 ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4861 if (checkpointSum0 != checkpointSum1)
4868 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4872 if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
4873 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4878 ok = yaffs_CheckpointOpen(dev, 1);
4881 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4882 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4885 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4886 ok = yaffs_WriteCheckpointDevice(dev);
4889 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4890 ok = yaffs_WriteCheckpointObjects(dev);
4893 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4894 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4898 ok = yaffs_WriteCheckpointSum(dev);
4900 if (!yaffs_CheckpointClose(dev))
4904 dev->isCheckpointed = 1;
4906 dev->isCheckpointed = 0;
4908 return dev->isCheckpointed;
4911 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4915 if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) {
4916 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4921 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4924 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4925 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4928 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4929 ok = yaffs_ReadCheckpointDevice(dev);
4932 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4933 ok = yaffs_ReadCheckpointObjects(dev);
4936 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4937 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4941 ok = yaffs_ReadCheckpointSum(dev);
4942 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4945 if (!yaffs_CheckpointClose(dev))
4949 dev->isCheckpointed = 1;
4951 dev->isCheckpointed = 0;
4957 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4959 if (dev->isCheckpointed ||
4960 dev->blocksInCheckpoint > 0) {
4961 dev->isCheckpointed = 0;
4962 yaffs_CheckpointInvalidateStream(dev);
4964 if (dev->param.markSuperBlockDirty)
4965 dev->param.markSuperBlockDirty(dev);
4969 int yaffs_CheckpointSave(yaffs_Device *dev)
4972 T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4974 yaffs_VerifyObjects(dev);
4975 yaffs_VerifyBlocks(dev);
4976 yaffs_VerifyFreeChunks(dev);
4978 if (!dev->isCheckpointed) {
4979 yaffs_InvalidateCheckpoint(dev);
4980 yaffs_WriteCheckpointData(dev);
4983 T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4985 return dev->isCheckpointed;
4988 int yaffs_CheckpointRestore(yaffs_Device *dev)
4991 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4993 retval = yaffs_ReadCheckpointData(dev);
4995 if (dev->isCheckpointed) {
4996 yaffs_VerifyObjects(dev);
4997 yaffs_VerifyBlocks(dev);
4998 yaffs_VerifyFreeChunks(dev);
5001 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
5006 /*--------------------- File read/write ------------------------
5007 * Read and write have very similar structures.
5008 * In general the read/write has three parts to it
5009 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
5010 * Some complete chunks
5011 * An incomplete chunk to end off with
5013 * Curve-balls: the first chunk might also be the last chunk.
5016 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
5025 yaffs_ChunkCache *cache;
5032 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
5033 /* start = offset % dev->nDataBytesPerChunk; */
5034 yaffs_AddrToChunk(dev, offset, &chunk, &start);
5037 /* OK now check for the curveball where the start and end are in
5040 if ((start + n) < dev->nDataBytesPerChunk)
5043 nToCopy = dev->nDataBytesPerChunk - start;
5045 cache = yaffs_FindChunkCache(in, chunk);
5047 /* If the chunk is already in the cache or it is less than a whole chunk
5048 * or we're using inband tags then use the cache (if there is caching)
5049 * else bypass the cache.
5051 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5052 if (dev->param.nShortOpCaches > 0) {
5054 /* If we can't find the data in the cache, then load it up. */
5057 cache = yaffs_GrabChunkCache(in->myDev);
5059 cache->chunkId = chunk;
5062 yaffs_ReadChunkDataFromObject(in, chunk,
5068 yaffs_UseChunkCache(dev, cache, 0);
5073 memcpy(buffer, &cache->data[start], nToCopy);
5077 /* Read into the local buffer then copy..*/
5080 yaffs_GetTempBuffer(dev, __LINE__);
5081 yaffs_ReadChunkDataFromObject(in, chunk,
5084 memcpy(buffer, &localBuffer[start], nToCopy);
5087 yaffs_ReleaseTempBuffer(dev, localBuffer,
5093 /* A full chunk. Read directly into the supplied buffer. */
5094 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
5108 int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5109 int nBytes, int writeThrough)
5118 int startOfWrite = offset;
5119 int chunkWritten = 0;
5127 while (n > 0 && chunkWritten >= 0) {
5128 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
5129 /* start = offset % dev->nDataBytesPerChunk; */
5130 yaffs_AddrToChunk(dev, offset, &chunk, &start);
5132 if (chunk * dev->nDataBytesPerChunk + start != offset ||
5133 start >= dev->nDataBytesPerChunk) {
5134 T(YAFFS_TRACE_ERROR, (
5135 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
5137 (int)offset, chunk, start));
5141 /* OK now check for the curveball where the start and end are in
5145 if ((start + n) < dev->nDataBytesPerChunk) {
5148 /* Now folks, to calculate how many bytes to write back....
5149 * If we're overwriting and not writing to then end of file then
5150 * we need to write back as much as was there before.
5153 chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
5155 if (chunkStart > in->variant.fileVariant.fileSize)
5156 nBytesRead = 0; /* Past end of file */
5158 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
5160 if (nBytesRead > dev->nDataBytesPerChunk)
5161 nBytesRead = dev->nDataBytesPerChunk;
5165 (start + n)) ? nBytesRead : (start + n);
5167 if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
5171 nToCopy = dev->nDataBytesPerChunk - start;
5172 nToWriteBack = dev->nDataBytesPerChunk;
5175 if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5176 /* An incomplete start or end chunk (or maybe both start and end chunk),
5177 * or we're using inband tags, so we want to use the cache buffers.
5179 if (dev->param.nShortOpCaches > 0) {
5180 yaffs_ChunkCache *cache;
5181 /* If we can't find the data in the cache, then load the cache */
5182 cache = yaffs_FindChunkCache(in, chunk);
5185 && yaffs_CheckSpaceForAllocation(dev, 1)) {
5186 cache = yaffs_GrabChunkCache(dev);
5188 cache->chunkId = chunk;
5191 yaffs_ReadChunkDataFromObject(in, chunk,
5195 !yaffs_CheckSpaceForAllocation(dev, 1)) {
5196 /* Drop the cache if it was a read cache item and
5197 * no space check has been made for it.
5203 yaffs_UseChunkCache(dev, cache, 1);
5207 memcpy(&cache->data[start], buffer,
5212 cache->nBytes = nToWriteBack;
5216 yaffs_WriteChunkDataToObject
5219 cache->data, cache->nBytes,
5225 chunkWritten = -1; /* fail the write */
5228 /* An incomplete start or end chunk (or maybe both start and end chunk)
5229 * Read into the local buffer then copy, then copy over and write back.
5233 yaffs_GetTempBuffer(dev, __LINE__);
5235 yaffs_ReadChunkDataFromObject(in, chunk,
5240 memcpy(&localBuffer[start], buffer, nToCopy);
5243 yaffs_WriteChunkDataToObject(in, chunk,
5248 yaffs_ReleaseTempBuffer(dev, localBuffer,
5254 /* A full chunk. Write directly from the supplied buffer. */
5259 yaffs_WriteChunkDataToObject(in, chunk, buffer,
5260 dev->nDataBytesPerChunk,
5263 /* Since we've overwritten the cached data, we better invalidate it. */
5264 yaffs_InvalidateChunkCache(in, chunk);
5267 if (chunkWritten >= 0) {
5276 /* Update file object */
5278 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5279 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5286 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5287 int nBytes, int writeThrough)
5289 yaffs_HandleHole(in,offset);
5290 return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
5295 /* ---------------------- File resizing stuff ------------------ */
5297 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5300 yaffs_Device *dev = in->myDev;
5301 int oldFileSize = in->variant.fileVariant.fileSize;
5303 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5305 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5306 dev->nDataBytesPerChunk;
5310 /* Delete backwards so that we don't end up with holes if
5311 * power is lost part-way through the operation.
5313 for (i = lastDel; i >= startDel; i--) {
5314 /* NB this could be optimised somewhat,
5315 * eg. could retrieve the tags and write them without
5316 * using yaffs_DeleteChunk
5319 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5322 (dev->internalStartBlock * dev->param.nChunksPerBlock)
5324 ((dev->internalEndBlock +
5325 1) * dev->param.nChunksPerBlock)) {
5326 T(YAFFS_TRACE_ALWAYS,
5327 (TSTR("Found daft chunkId %d for %d" TENDSTR),
5331 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5339 static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
5342 __u32 newSizeOfPartialChunk;
5343 yaffs_Device *dev = obj->myDev;
5345 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5347 yaffs_PruneResizedChunks(obj, newSize);
5349 if (newSizeOfPartialChunk != 0) {
5350 int lastChunk = 1 + newFullChunks;
5351 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5353 /* Got to read and rewrite the last chunk with its new size and zero pad */
5354 yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
5355 memset(localBuffer + newSizeOfPartialChunk, 0,
5356 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5358 yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
5359 newSizeOfPartialChunk, 1);
5361 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5364 obj->variant.fileVariant.fileSize = newSize;
5366 yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
5370 static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize)
5372 /* if newsSize > oldFileSize.
5373 * We're going to be writing a hole.
5374 * If the hole is small then write zeros otherwise write a start of hole marker.
5381 int result = YAFFS_OK;
5382 yaffs_Device *dev = NULL;
5384 __u8 *localBuffer = NULL;
5386 int smallIncreaseOk = 0;
5391 if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
5396 /* Bail out if not yaffs2 mode */
5397 if(!dev->param.isYaffs2)
5400 oldFileSize = obj->variant.fileVariant.fileSize;
5402 if (newSize <= oldFileSize)
5405 increase = newSize - oldFileSize;
5407 if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
5408 yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
5414 localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
5417 /* fill hole with zero bytes */
5418 int pos = oldFileSize;
5421 memset(localBuffer,0,dev->nDataBytesPerChunk);
5422 smallIncreaseOk = 1;
5424 while(increase > 0 && smallIncreaseOk){
5425 thisWrite = increase;
5426 if(thisWrite > dev->nDataBytesPerChunk)
5427 thisWrite = dev->nDataBytesPerChunk;
5428 written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
5429 if(written == thisWrite){
5431 increase -= thisWrite;
5433 smallIncreaseOk = 0;
5436 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
5438 /* If we were out of space then reverse any chunks we've added */
5439 if(!smallIncreaseOk)
5440 yaffs_ResizeDown(obj, oldFileSize);
5443 if (!smallIncreaseOk &&
5445 obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5446 obj->parent->objectId != YAFFS_OBJECTID_DELETED){
5447 /* Write a hole start header with the old file size */
5448 yaffs_UpdateObjectHeader(obj, NULL, 0,1,0);
5455 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5457 yaffs_Device *dev = in->myDev;
5458 int oldFileSize = in->variant.fileVariant.fileSize;
5460 yaffs_FlushFilesChunkCache(in);
5461 yaffs_InvalidateWholeChunkCache(in);
5463 yaffs_CheckGarbageCollection(dev,0);
5465 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5468 if (newSize == oldFileSize)
5471 if(newSize > oldFileSize){
5472 yaffs_HandleHole(in,newSize);
5473 in->variant.fileVariant.fileSize = newSize;
5475 /* newSize < oldFileSize */
5476 yaffs_ResizeDown(in, newSize);
5479 /* Write a new object header to reflect the resize.
5480 * show we've shrunk the file, if need be
5481 * Do this only if the file is not in the deleted directories
5482 * and is not shadowed.
5486 in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5487 in->parent->objectId != YAFFS_OBJECTID_DELETED)
5488 yaffs_UpdateObjectHeader(in, NULL, 0,0,0);
5494 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5496 YCHAR *alias = NULL;
5497 obj = yaffs_GetEquivalentObject(obj);
5499 switch (obj->variantType) {
5500 case YAFFS_OBJECT_TYPE_FILE:
5501 return obj->variant.fileVariant.fileSize;
5502 case YAFFS_OBJECT_TYPE_SYMLINK:
5503 alias = obj->variant.symLinkVariant.alias;
5506 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5514 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5518 yaffs_FlushFilesChunkCache(in);
5519 if(dataSync) /* Only sync data */
5523 #ifdef CONFIG_YAFFS_WINCE
5524 yfsd_WinFileTimeNow(in->win_mtime);
5527 in->yst_mtime = Y_CURRENT_TIME;
5532 retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5533 0) ? YAFFS_OK : YAFFS_FAIL;
5543 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5546 /* First off, invalidate the file's data in the cache, without flushing. */
5547 yaffs_InvalidateWholeChunkCache(in);
5549 if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5550 /* Move to the unlinked directory so we have a record that it was deleted. */
5551 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5555 yaffs_RemoveObjectFromDirectory(in);
5556 yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5559 yaffs_FreeObject(in);
5564 /* yaffs_DeleteFile deletes the whole file data
5565 * and the inode associated with the file.
5566 * It does not delete the links associated with the file.
5568 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5572 int immediateDeletion = 0;
5573 yaffs_Device *dev = in->myDev;
5576 immediateDeletion = 1;
5578 if (immediateDeletion) {
5580 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5581 _Y("deleted"), 0, 0);
5582 T(YAFFS_TRACE_TRACING,
5583 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5586 in->myDev->nDeletedFiles++;
5587 if (dev->param.disableSoftDelete || dev->param.isYaffs2)
5588 yaffs_ResizeFile(in, 0);
5589 yaffs_SoftDeleteFile(in);
5592 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5593 _Y("unlinked"), 0, 0);
5600 int yaffs_DeleteFile(yaffs_Object *in)
5602 int retVal = YAFFS_OK;
5603 int deleted = in->deleted;
5604 yaffs_Device *dev = in->myDev;
5606 if (dev->param.disableSoftDelete || dev->param.isYaffs2)
5607 yaffs_ResizeFile(in, 0);
5609 if (in->nDataChunks > 0) {
5610 /* Use soft deletion if there is data in the file.
5611 * That won't be the case if it has been resized to zero.
5614 retVal = yaffs_UnlinkFileIfNeeded(in);
5616 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5619 in->myDev->nDeletedFiles++;
5620 yaffs_SoftDeleteFile(in);
5622 return deleted ? YAFFS_OK : YAFFS_FAIL;
5624 /* The file has no data chunks so we toss it immediately */
5625 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5626 in->variant.fileVariant.top = NULL;
5627 yaffs_DoGenericObjectDeletion(in);
5633 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5635 return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5636 !(ylist_empty(&obj->variant.directoryVariant.children));
5639 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5641 /* First check that the directory is empty. */
5642 if (yaffs_IsNonEmptyDirectory(obj))
5645 return yaffs_DoGenericObjectDeletion(obj);
5648 static int yaffs_DeleteSymLink(yaffs_Object *in)
5650 if(in->variant.symLinkVariant.alias)
5651 YFREE(in->variant.symLinkVariant.alias);
5652 in->variant.symLinkVariant.alias=NULL;
5654 return yaffs_DoGenericObjectDeletion(in);
5657 static int yaffs_DeleteHardLink(yaffs_Object *in)
5659 /* remove this hardlink from the list assocaited with the equivalent
5662 ylist_del_init(&in->hardLinks);
5663 return yaffs_DoGenericObjectDeletion(in);
5666 int yaffs_DeleteObject(yaffs_Object *obj)
5669 switch (obj->variantType) {
5670 case YAFFS_OBJECT_TYPE_FILE:
5671 retVal = yaffs_DeleteFile(obj);
5673 case YAFFS_OBJECT_TYPE_DIRECTORY:
5674 if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
5675 T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
5676 ylist_del_init(&obj->variant.directoryVariant.dirty);
5678 return yaffs_DeleteDirectory(obj);
5680 case YAFFS_OBJECT_TYPE_SYMLINK:
5681 retVal = yaffs_DeleteSymLink(obj);
5683 case YAFFS_OBJECT_TYPE_HARDLINK:
5684 retVal = yaffs_DeleteHardLink(obj);
5686 case YAFFS_OBJECT_TYPE_SPECIAL:
5687 retVal = yaffs_DoGenericObjectDeletion(obj);
5689 case YAFFS_OBJECT_TYPE_UNKNOWN:
5691 break; /* should not happen. */
5697 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5700 int immediateDeletion = 0;
5703 immediateDeletion = 1;
5706 yaffs_UpdateParent(obj->parent);
5708 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5709 return yaffs_DeleteHardLink(obj);
5710 } else if (!ylist_empty(&obj->hardLinks)) {
5711 /* Curve ball: We're unlinking an object that has a hardlink.
5713 * This problem arises because we are not strictly following
5714 * The Linux link/inode model.
5716 * We can't really delete the object.
5717 * Instead, we do the following:
5718 * - Select a hardlink.
5719 * - Unhook it from the hard links
5720 * - Move it from its parent directory (so that the rename can work)
5721 * - Rename the object to the hardlink's name.
5722 * - Delete the hardlink
5726 yaffs_Object *parent;
5728 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5730 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5732 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5733 parent = hl->parent;
5735 ylist_del_init(&hl->hardLinks);
5737 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5739 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5741 if (retVal == YAFFS_OK)
5742 retVal = yaffs_DoGenericObjectDeletion(hl);
5746 } else if (immediateDeletion) {
5747 switch (obj->variantType) {
5748 case YAFFS_OBJECT_TYPE_FILE:
5749 return yaffs_DeleteFile(obj);
5751 case YAFFS_OBJECT_TYPE_DIRECTORY:
5752 ylist_del_init(&obj->variant.directoryVariant.dirty);
5753 return yaffs_DeleteDirectory(obj);
5755 case YAFFS_OBJECT_TYPE_SYMLINK:
5756 return yaffs_DeleteSymLink(obj);
5758 case YAFFS_OBJECT_TYPE_SPECIAL:
5759 return yaffs_DoGenericObjectDeletion(obj);
5761 case YAFFS_OBJECT_TYPE_HARDLINK:
5762 case YAFFS_OBJECT_TYPE_UNKNOWN:
5766 } else if(yaffs_IsNonEmptyDirectory(obj))
5769 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5770 _Y("unlinked"), 0, 0);
5774 static int yaffs_UnlinkObject(yaffs_Object *obj)
5777 if (obj && obj->unlinkAllowed)
5778 return yaffs_UnlinkWorker(obj);
5783 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5787 obj = yaffs_FindObjectByName(dir, name);
5788 return yaffs_UnlinkObject(obj);
5791 /*----------------------- Initialisation Scanning ---------------------- */
5793 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5794 int backwardScanning)
5798 if (!backwardScanning) {
5799 /* Handle YAFFS1 forward scanning case
5800 * For YAFFS1 we always do the deletion
5804 /* Handle YAFFS2 case (backward scanning)
5805 * If the shadowed object exists then ignore.
5807 obj = yaffs_FindObjectByNumber(dev, objId);
5812 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5813 * We put it in unlinked dir to be cleaned up after the scanning
5816 yaffs_FindOrCreateObjectByNumber(dev, objId,
5817 YAFFS_OBJECT_TYPE_FILE);
5820 obj->isShadowed = 1;
5821 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5822 obj->variant.fileVariant.shrinkSize = 0;
5823 obj->valid = 1; /* So that we don't read any other info for this file */
5833 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5840 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5842 in = yaffs_FindObjectByNumber(dev,
5843 hl->variant.hardLinkVariant.
5844 equivalentObjectId);
5847 /* Add the hardlink pointers */
5848 hl->variant.hardLinkVariant.equivalentObject = in;
5849 ylist_add(&hl->hardLinks, &in->hardLinks);
5851 /* Todo Need to report/handle this better.
5852 * Got a problem... hardlink to a non-existant object
5854 hl->variant.hardLinkVariant.equivalentObject = NULL;
5855 YINIT_LIST_HEAD(&hl->hardLinks);
5865 static int ybicmp(const void *a, const void *b)
5867 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5868 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5869 register int ablock = ((yaffs_BlockIndex *)a)->block;
5870 register int bblock = ((yaffs_BlockIndex *)b)->block;
5872 return ablock - bblock;
5878 struct yaffs_ShadowFixerStruct {
5881 struct yaffs_ShadowFixerStruct *next;
5885 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5888 * Sort out state of unlinked and deleted objects after scanning.
5890 struct ylist_head *i;
5891 struct ylist_head *n;
5894 /* Soft delete all the unlinked files */
5895 ylist_for_each_safe(i, n,
5896 &dev->unlinkedDir->variant.directoryVariant.children) {
5898 l = ylist_entry(i, yaffs_Object, siblings);
5899 yaffs_DeleteObject(l);
5903 ylist_for_each_safe(i, n,
5904 &dev->deletedDir->variant.directoryVariant.children) {
5906 l = ylist_entry(i, yaffs_Object, siblings);
5907 yaffs_DeleteObject(l);
5914 * This code iterates through all the objects making sure that they are rooted.
5915 * Any unrooted objects are re-rooted in lost+found.
5916 * An object needs to be in one of:
5917 * - Directly under deleted, unlinked
5918 * - Directly or indirectly under root.
5921 * This code assumes that we don't ever change the current relationships between
5923 * rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5924 * lostNfound->parent == rootDir
5926 * This fixes the problem where directories might have inadvertently been deleted
5927 * leaving the object "hanging" without being rooted in the directory tree.
5930 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5932 return (obj == dev->deletedDir ||
5933 obj == dev->unlinkedDir||
5934 obj == dev->rootDir);
5937 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5940 yaffs_Object *parent;
5942 struct ylist_head *lh;
5943 struct ylist_head *n;
5948 /* Iterate through the objects in each hash entry,
5949 * looking at each object.
5950 * Make sure it is rooted.
5953 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
5954 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5956 obj = ylist_entry(lh, yaffs_Object, hashLink);
5957 parent= obj->parent;
5959 if(yaffs_HasNULLParent(dev,obj)){
5960 /* These directories are not hanging */
5963 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5965 else if(yaffs_HasNULLParent(dev,parent))
5969 * Need to follow the parent chain to see if it is hanging.
5974 while(parent != dev->rootDir &&
5976 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5978 parent = parent->parent;
5981 if(parent != dev->rootDir)
5986 (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5988 yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5997 * Delete directory contents for cleaning up lost and found.
5999 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
6002 struct ylist_head *lh;
6003 struct ylist_head *n;
6005 if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
6008 ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
6010 obj = ylist_entry(lh, yaffs_Object, siblings);
6011 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
6012 yaffs_DeleteDirectoryContents(obj);
6015 (TSTR("Deleting lost_found object %d" TENDSTR),
6018 /* Need to use UnlinkObject since Delete would not handle
6019 * hardlinked objects correctly.
6021 yaffs_UnlinkObject(obj);
6027 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
6029 yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
6032 static int yaffs_Scan(yaffs_Device *dev)
6034 yaffs_ExtendedTags tags;
6044 yaffs_BlockState state;
6045 yaffs_Object *hardList = NULL;
6046 yaffs_BlockInfo *bi;
6047 __u32 sequenceNumber;
6048 yaffs_ObjectHeader *oh;
6050 yaffs_Object *parent;
6052 int alloc_failed = 0;
6054 struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
6062 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
6063 dev->internalStartBlock, dev->internalEndBlock));
6065 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6067 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6069 /* Scan all the blocks to determine their state */
6070 bi = dev->blockInfo;
6071 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6072 yaffs_ClearChunkBits(dev, blk);
6074 bi->softDeletions = 0;
6076 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6078 bi->blockState = state;
6079 bi->sequenceNumber = sequenceNumber;
6081 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6082 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6084 T(YAFFS_TRACE_SCAN_DEBUG,
6085 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6086 state, sequenceNumber));
6088 if (state == YAFFS_BLOCK_STATE_DEAD) {
6089 T(YAFFS_TRACE_BAD_BLOCKS,
6090 (TSTR("block %d is bad" TENDSTR), blk));
6091 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6092 T(YAFFS_TRACE_SCAN_DEBUG,
6093 (TSTR("Block empty " TENDSTR)));
6094 dev->nErasedBlocks++;
6095 dev->nFreeChunks += dev->param.nChunksPerBlock;
6100 startIterator = dev->internalStartBlock;
6101 endIterator = dev->internalEndBlock;
6103 /* For each block.... */
6104 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
6111 blk = blockIterator;
6113 bi = yaffs_GetBlockInfo(dev, blk);
6114 state = bi->blockState;
6118 /* For each chunk in each block that needs scanning....*/
6119 for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
6120 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
6121 /* Read the tags and decide what to do */
6122 chunk = blk * dev->param.nChunksPerBlock + c;
6124 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6127 /* Let's have a good look at this chunk... */
6129 if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
6135 /*T((" %d %d deleted\n",blk,c)); */
6136 } else if (!tags.chunkUsed) {
6137 /* An unassigned chunk in the block
6138 * This means that either the block is empty or
6139 * this is the one being allocated from
6143 /* We're looking at the first chunk in the block so the block is unused */
6144 state = YAFFS_BLOCK_STATE_EMPTY;
6145 dev->nErasedBlocks++;
6147 /* this is the block being allocated from */
6150 (" Allocating from %d %d" TENDSTR),
6152 state = YAFFS_BLOCK_STATE_ALLOCATING;
6153 dev->allocationBlock = blk;
6154 dev->allocationPage = c;
6155 dev->allocationBlockFinder = blk;
6156 /* Set block finder here to encourage the allocator to go forth from here. */
6160 dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
6161 } else if (tags.chunkId > 0) {
6162 /* chunkId > 0 so it is a data chunk... */
6163 unsigned int endpos;
6165 yaffs_SetChunkBit(dev, blk, c);
6168 in = yaffs_FindOrCreateObjectByNumber(dev,
6171 YAFFS_OBJECT_TYPE_FILE);
6172 /* PutChunkIntoFile checks for a clash (two data chunks with
6173 * the same chunkId).
6180 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
6185 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
6188 in->variantType == YAFFS_OBJECT_TYPE_FILE
6189 && in->variant.fileVariant.scannedFileSize <
6191 in->variant.fileVariant.
6192 scannedFileSize = endpos;
6193 if (!dev->param.useHeaderFileSize) {
6194 in->variant.fileVariant.
6196 in->variant.fileVariant.
6201 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
6203 /* chunkId == 0, so it is an ObjectHeader.
6204 * Thus, we read in the object header and make the object
6206 yaffs_SetChunkBit(dev, blk, c);
6209 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
6213 oh = (yaffs_ObjectHeader *) chunkData;
6215 in = yaffs_FindObjectByNumber(dev,
6217 if (in && in->variantType != oh->type) {
6218 /* This should not happen, but somehow
6219 * Wev'e ended up with an objectId that has been reused but not yet
6220 * deleted, and worse still it has changed type. Delete the old object.
6223 yaffs_DeleteObject(in);
6228 in = yaffs_FindOrCreateObjectByNumber(dev,
6236 if (in && oh->shadowsObject > 0) {
6238 struct yaffs_ShadowFixerStruct *fixer;
6239 fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
6241 fixer->next = shadowFixerList;
6242 shadowFixerList = fixer;
6243 fixer->objectId = tags.objectId;
6244 fixer->shadowedId = oh->shadowsObject;
6249 if (in && in->valid) {
6250 /* We have already filled this one. We have a duplicate and need to resolve it. */
6252 unsigned existingSerial = in->serial;
6253 unsigned newSerial = tags.serialNumber;
6255 if (((existingSerial + 1) & 3) == newSerial) {
6256 /* Use new one - destroy the exisiting one */
6257 yaffs_DeleteChunk(dev,
6262 /* Use existing - destroy this one. */
6263 yaffs_DeleteChunk(dev, chunk, 1,
6268 if (in && !in->valid &&
6269 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6270 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
6271 /* We only load some info, don't fiddle with directory structure */
6273 in->variantType = oh->type;
6275 in->yst_mode = oh->yst_mode;
6276 #ifdef CONFIG_YAFFS_WINCE
6277 in->win_atime[0] = oh->win_atime[0];
6278 in->win_ctime[0] = oh->win_ctime[0];
6279 in->win_mtime[0] = oh->win_mtime[0];
6280 in->win_atime[1] = oh->win_atime[1];
6281 in->win_ctime[1] = oh->win_ctime[1];
6282 in->win_mtime[1] = oh->win_mtime[1];
6284 in->yst_uid = oh->yst_uid;
6285 in->yst_gid = oh->yst_gid;
6286 in->yst_atime = oh->yst_atime;
6287 in->yst_mtime = oh->yst_mtime;
6288 in->yst_ctime = oh->yst_ctime;
6289 in->yst_rdev = oh->yst_rdev;
6291 in->hdrChunk = chunk;
6292 in->serial = tags.serialNumber;
6294 } else if (in && !in->valid) {
6295 /* we need to load this info */
6298 in->variantType = oh->type;
6300 in->yst_mode = oh->yst_mode;
6301 #ifdef CONFIG_YAFFS_WINCE
6302 in->win_atime[0] = oh->win_atime[0];
6303 in->win_ctime[0] = oh->win_ctime[0];
6304 in->win_mtime[0] = oh->win_mtime[0];
6305 in->win_atime[1] = oh->win_atime[1];
6306 in->win_ctime[1] = oh->win_ctime[1];
6307 in->win_mtime[1] = oh->win_mtime[1];
6309 in->yst_uid = oh->yst_uid;
6310 in->yst_gid = oh->yst_gid;
6311 in->yst_atime = oh->yst_atime;
6312 in->yst_mtime = oh->yst_mtime;
6313 in->yst_ctime = oh->yst_ctime;
6314 in->yst_rdev = oh->yst_rdev;
6316 in->hdrChunk = chunk;
6317 in->serial = tags.serialNumber;
6319 yaffs_SetObjectName(in, oh->name);
6322 /* directory stuff...
6327 yaffs_FindOrCreateObjectByNumber
6328 (dev, oh->parentObjectId,
6329 YAFFS_OBJECT_TYPE_DIRECTORY);
6332 if (parent && parent->variantType ==
6333 YAFFS_OBJECT_TYPE_UNKNOWN) {
6334 /* Set up as a directory */
6335 parent->variantType =
6336 YAFFS_OBJECT_TYPE_DIRECTORY;
6337 YINIT_LIST_HEAD(&parent->variant.
6340 } else if (!parent || parent->variantType !=
6341 YAFFS_OBJECT_TYPE_DIRECTORY) {
6342 /* Hoosterman, another problem....
6343 * We're trying to use a non-directory as a directory
6346 T(YAFFS_TRACE_ERROR,
6348 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6350 parent = dev->lostNFoundDir;
6353 yaffs_AddObjectToDirectory(parent, in);
6355 if (0 && (parent == dev->deletedDir ||
6356 parent == dev->unlinkedDir)) {
6357 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
6358 dev->nDeletedFiles++;
6360 /* Note re hardlinks.
6361 * Since we might scan a hardlink before its equivalent object is scanned
6362 * we put them all in a list.
6363 * After scanning is complete, we should have all the objects, so we run through this
6364 * list and fix up all the chains.
6367 switch (in->variantType) {
6368 case YAFFS_OBJECT_TYPE_UNKNOWN:
6369 /* Todo got a problem */
6371 case YAFFS_OBJECT_TYPE_FILE:
6372 if (dev->param.useHeaderFileSize)
6374 in->variant.fileVariant.
6379 case YAFFS_OBJECT_TYPE_HARDLINK:
6380 in->variant.hardLinkVariant.
6381 equivalentObjectId =
6382 oh->equivalentObjectId;
6383 in->hardLinks.next =
6384 (struct ylist_head *)
6388 case YAFFS_OBJECT_TYPE_DIRECTORY:
6391 case YAFFS_OBJECT_TYPE_SPECIAL:
6394 case YAFFS_OBJECT_TYPE_SYMLINK:
6395 in->variant.symLinkVariant.alias =
6396 yaffs_CloneString(oh->alias);
6397 if (!in->variant.symLinkVariant.alias)
6406 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6407 /* If we got this far while scanning, then the block is fully allocated.*/
6408 state = YAFFS_BLOCK_STATE_FULL;
6411 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6412 /* If the block was partially allocated then treat it as fully allocated.*/
6413 state = YAFFS_BLOCK_STATE_FULL;
6414 dev->allocationBlock = -1;
6417 bi->blockState = state;
6419 /* Now let's see if it was dirty */
6420 if (bi->pagesInUse == 0 &&
6421 !bi->hasShrinkHeader &&
6422 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6423 yaffs_BlockBecameDirty(dev, blk);
6429 /* Ok, we've done all the scanning.
6430 * Fix up the hard link chains.
6431 * We should now have scanned all the objects, now it's time to add these
6435 yaffs_HardlinkFixup(dev, hardList);
6437 /* Fix up any shadowed objects */
6439 struct yaffs_ShadowFixerStruct *fixer;
6442 while (shadowFixerList) {
6443 fixer = shadowFixerList;
6444 shadowFixerList = fixer->next;
6445 /* Complete the rename transaction by deleting the shadowed object
6446 * then setting the object header to unshadowed.
6448 obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6450 yaffs_DeleteObject(obj);
6452 obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6455 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6461 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6466 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6472 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6475 yaffs_ObjectHeader *oh;
6477 yaffs_ExtendedTags tags;
6479 int alloc_failed = 0;
6487 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6489 in->lazyLoaded ? "not yet" : "already"));
6492 if (in->lazyLoaded && in->hdrChunk > 0) {
6494 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6496 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6497 oh = (yaffs_ObjectHeader *) chunkData;
6499 in->yst_mode = oh->yst_mode;
6500 #ifdef CONFIG_YAFFS_WINCE
6501 in->win_atime[0] = oh->win_atime[0];
6502 in->win_ctime[0] = oh->win_ctime[0];
6503 in->win_mtime[0] = oh->win_mtime[0];
6504 in->win_atime[1] = oh->win_atime[1];
6505 in->win_ctime[1] = oh->win_ctime[1];
6506 in->win_mtime[1] = oh->win_mtime[1];
6508 in->yst_uid = oh->yst_uid;
6509 in->yst_gid = oh->yst_gid;
6510 in->yst_atime = oh->yst_atime;
6511 in->yst_mtime = oh->yst_mtime;
6512 in->yst_ctime = oh->yst_ctime;
6513 in->yst_rdev = oh->yst_rdev;
6516 yaffs_SetObjectName(in, oh->name);
6518 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6519 in->variant.symLinkVariant.alias =
6520 yaffs_CloneString(oh->alias);
6521 if (!in->variant.symLinkVariant.alias)
6522 alloc_failed = 1; /* Not returned to caller */
6525 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6529 static int yaffs_ScanBackwards(yaffs_Device *dev)
6531 yaffs_ExtendedTags tags;
6536 int nBlocksToScan = 0;
6542 yaffs_BlockState state;
6543 yaffs_Object *hardList = NULL;
6544 yaffs_BlockInfo *bi;
6545 __u32 sequenceNumber;
6546 yaffs_ObjectHeader *oh;
6548 yaffs_Object *parent;
6549 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6555 int foundChunksInBlock;
6556 int equivalentObjectId;
6557 int alloc_failed = 0;
6560 yaffs_BlockIndex *blockIndex = NULL;
6561 int altBlockIndex = 0;
6563 if (!dev->param.isYaffs2) {
6565 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6571 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
6572 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6575 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6577 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6580 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6586 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6590 dev->blocksInCheckpoint = 0;
6592 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6594 /* Scan all the blocks to determine their state */
6595 bi = dev->blockInfo;
6596 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6597 yaffs_ClearChunkBits(dev, blk);
6599 bi->softDeletions = 0;
6601 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6603 bi->blockState = state;
6604 bi->sequenceNumber = sequenceNumber;
6606 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6607 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6608 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6609 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6611 T(YAFFS_TRACE_SCAN_DEBUG,
6612 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6613 state, sequenceNumber));
6616 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6617 dev->blocksInCheckpoint++;
6619 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6620 T(YAFFS_TRACE_BAD_BLOCKS,
6621 (TSTR("block %d is bad" TENDSTR), blk));
6622 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6623 T(YAFFS_TRACE_SCAN_DEBUG,
6624 (TSTR("Block empty " TENDSTR)));
6625 dev->nErasedBlocks++;
6626 dev->nFreeChunks += dev->param.nChunksPerBlock;
6627 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6629 /* Determine the highest sequence number */
6630 if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6631 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6633 blockIndex[nBlocksToScan].seq = sequenceNumber;
6634 blockIndex[nBlocksToScan].block = blk;
6638 if (sequenceNumber >= dev->sequenceNumber)
6639 dev->sequenceNumber = sequenceNumber;
6641 /* TODO: Nasty sequence number! */
6644 ("Block scanning block %d has bad sequence number %d"
6645 TENDSTR), blk, sequenceNumber));
6653 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6659 /* Sort the blocks */
6660 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6662 /* Use qsort now. */
6663 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6667 /* Dungy old bubble sort... */
6669 yaffs_BlockIndex temp;
6673 for (i = 0; i < nBlocksToScan; i++)
6674 for (j = i + 1; j < nBlocksToScan; j++)
6675 if (blockIndex[i].seq > blockIndex[j].seq) {
6676 temp = blockIndex[j];
6677 blockIndex[j] = blockIndex[i];
6678 blockIndex[i] = temp;
6685 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6687 /* Now scan the blocks looking at the data. */
6689 endIterator = nBlocksToScan - 1;
6690 T(YAFFS_TRACE_SCAN_DEBUG,
6691 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6693 /* For each block.... backwards */
6694 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6696 /* Cooperative multitasking! This loop can run for so
6697 long that watchdog timers expire. */
6700 /* get the block to scan in the correct order */
6701 blk = blockIndex[blockIterator].block;
6703 bi = yaffs_GetBlockInfo(dev, blk);
6706 state = bi->blockState;
6710 /* For each chunk in each block that needs scanning.... */
6711 foundChunksInBlock = 0;
6712 for (c = dev->param.nChunksPerBlock - 1;
6713 !alloc_failed && c >= 0 &&
6714 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6715 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6716 /* Scan backwards...
6717 * Read the tags and decide what to do
6720 chunk = blk * dev->param.nChunksPerBlock + c;
6722 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6725 /* Let's have a good look at this chunk... */
6727 if (!tags.chunkUsed) {
6728 /* An unassigned chunk in the block.
6729 * If there are used chunks after this one, then
6730 * it is a chunk that was skipped due to failing the erased
6731 * check. Just skip it so that it can be deleted.
6732 * But, more typically, We get here when this is an unallocated
6733 * chunk and his means that either the block is empty or
6734 * this is the one being allocated from
6737 if (foundChunksInBlock) {
6738 /* This is a chunk that was skipped due to failing the erased check */
6739 } else if (c == 0) {
6740 /* We're looking at the first chunk in the block so the block is unused */
6741 state = YAFFS_BLOCK_STATE_EMPTY;
6742 dev->nErasedBlocks++;
6744 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6745 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6746 if (dev->sequenceNumber == bi->sequenceNumber) {
6747 /* this is the block being allocated from */
6751 (" Allocating from %d %d"
6754 state = YAFFS_BLOCK_STATE_ALLOCATING;
6755 dev->allocationBlock = blk;
6756 dev->allocationPage = c;
6757 dev->allocationBlockFinder = blk;
6759 /* This is a partially written block that is not
6760 * the current allocation block.
6763 T(YAFFS_TRACE_ALWAYS,
6764 (TSTR("Partially written block %d detected" TENDSTR),
6772 } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6774 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6779 } else if (tags.chunkId > 0) {
6780 /* chunkId > 0 so it is a data chunk... */
6781 unsigned int endpos;
6783 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6785 foundChunksInBlock = 1;
6788 yaffs_SetChunkBit(dev, blk, c);
6791 in = yaffs_FindOrCreateObjectByNumber(dev,
6794 YAFFS_OBJECT_TYPE_FILE);
6801 in->variantType == YAFFS_OBJECT_TYPE_FILE
6802 && chunkBase < in->variant.fileVariant.shrinkSize) {
6803 /* This has not been invalidated by a resize */
6804 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
6808 /* File size is calculated by looking at the data chunks if we have not
6809 * seen an object header yet. Stop this practice once we find an object header.
6811 endpos = chunkBase + tags.byteCount;
6813 if (!in->valid && /* have not got an object header yet */
6814 in->variant.fileVariant.scannedFileSize < endpos) {
6815 in->variant.fileVariant.scannedFileSize = endpos;
6816 in->variant.fileVariant.fileSize = endpos;
6820 /* This chunk has been invalidated by a resize, or a past file deletion
6821 * so delete the chunk*/
6822 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6826 /* chunkId == 0, so it is an ObjectHeader.
6827 * Thus, we read in the object header and make the object
6829 foundChunksInBlock = 1;
6831 yaffs_SetChunkBit(dev, blk, c);
6837 if (tags.extraHeaderInfoAvailable) {
6838 in = yaffs_FindOrCreateObjectByNumber(dev,
6840 tags.extraObjectType);
6846 (!in->valid && dev->param.disableLazyLoad) ||
6847 tags.extraShadows ||
6849 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6850 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6852 /* If we don't have valid info then we need to read the chunk
6853 * TODO In future we can probably defer reading the chunk and
6854 * living with invalid data until needed.
6857 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6862 oh = (yaffs_ObjectHeader *) chunkData;
6864 if (dev->param.inbandTags) {
6865 /* Fix up the header if they got corrupted by inband tags */
6866 oh->shadowsObject = oh->inbandShadowsObject;
6867 oh->isShrink = oh->inbandIsShrink;
6871 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6879 /* TODO Hoosterman we have a problem! */
6880 T(YAFFS_TRACE_ERROR,
6882 ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
6883 TENDSTR), tags.objectId, chunk));
6888 /* We have already filled this one.
6889 * We have a duplicate that will be discarded, but
6890 * we first have to suck out resize info if it is a file.
6893 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6895 oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6896 (tags.extraHeaderInfoAvailable &&
6897 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6899 (oh) ? oh->fileSize : tags.
6901 __u32 parentObjectId =
6903 parentObjectId : tags.
6904 extraParentObjectId;
6908 (oh) ? oh->isShrink : tags.
6909 extraIsShrinkHeader;
6911 /* If it is deleted (unlinked at start also means deleted)
6912 * we treat the file size as being zeroed at this point.
6914 if (parentObjectId ==
6915 YAFFS_OBJECTID_DELETED
6916 || parentObjectId ==
6917 YAFFS_OBJECTID_UNLINKED) {
6922 if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
6923 in->variant.fileVariant.shrinkSize = thisSize;
6926 bi->hasShrinkHeader = 1;
6929 /* Use existing - destroy this one. */
6930 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6934 if (!in->valid && in->variantType !=
6935 (oh ? oh->type : tags.extraObjectType))
6936 T(YAFFS_TRACE_ERROR, (
6937 TSTR("yaffs tragedy: Bad object type, "
6938 TCONT("%d != %d, for object %d at chunk ")
6939 TCONT("%d during scan")
6941 oh->type : tags.extraObjectType,
6942 in->variantType, tags.objectId,
6946 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6948 YAFFS_OBJECTID_LOSTNFOUND)) {
6949 /* We only load some info, don't fiddle with directory structure */
6953 in->variantType = oh->type;
6955 in->yst_mode = oh->yst_mode;
6956 #ifdef CONFIG_YAFFS_WINCE
6957 in->win_atime[0] = oh->win_atime[0];
6958 in->win_ctime[0] = oh->win_ctime[0];
6959 in->win_mtime[0] = oh->win_mtime[0];
6960 in->win_atime[1] = oh->win_atime[1];
6961 in->win_ctime[1] = oh->win_ctime[1];
6962 in->win_mtime[1] = oh->win_mtime[1];
6964 in->yst_uid = oh->yst_uid;
6965 in->yst_gid = oh->yst_gid;
6966 in->yst_atime = oh->yst_atime;
6967 in->yst_mtime = oh->yst_mtime;
6968 in->yst_ctime = oh->yst_ctime;
6969 in->yst_rdev = oh->yst_rdev;
6973 in->variantType = tags.extraObjectType;
6977 in->hdrChunk = chunk;
6979 } else if (!in->valid) {
6980 /* we need to load this info */
6983 in->hdrChunk = chunk;
6986 in->variantType = oh->type;
6988 in->yst_mode = oh->yst_mode;
6989 #ifdef CONFIG_YAFFS_WINCE
6990 in->win_atime[0] = oh->win_atime[0];
6991 in->win_ctime[0] = oh->win_ctime[0];
6992 in->win_mtime[0] = oh->win_mtime[0];
6993 in->win_atime[1] = oh->win_atime[1];
6994 in->win_ctime[1] = oh->win_ctime[1];
6995 in->win_mtime[1] = oh->win_mtime[1];
6997 in->yst_uid = oh->yst_uid;
6998 in->yst_gid = oh->yst_gid;
6999 in->yst_atime = oh->yst_atime;
7000 in->yst_mtime = oh->yst_mtime;
7001 in->yst_ctime = oh->yst_ctime;
7002 in->yst_rdev = oh->yst_rdev;
7005 if (oh->shadowsObject > 0)
7006 yaffs_HandleShadowedObject(dev,
7013 yaffs_SetObjectName(in, oh->name);
7015 yaffs_FindOrCreateObjectByNumber
7016 (dev, oh->parentObjectId,
7017 YAFFS_OBJECT_TYPE_DIRECTORY);
7019 fileSize = oh->fileSize;
7020 isShrink = oh->isShrink;
7021 equivalentObjectId = oh->equivalentObjectId;
7024 in->variantType = tags.extraObjectType;
7026 yaffs_FindOrCreateObjectByNumber
7027 (dev, tags.extraParentObjectId,
7028 YAFFS_OBJECT_TYPE_DIRECTORY);
7029 fileSize = tags.extraFileLength;
7030 isShrink = tags.extraIsShrinkHeader;
7031 equivalentObjectId = tags.extraEquivalentObjectId;
7040 /* directory stuff...
7044 if (parent && parent->variantType ==
7045 YAFFS_OBJECT_TYPE_UNKNOWN) {
7046 /* Set up as a directory */
7047 parent->variantType =
7048 YAFFS_OBJECT_TYPE_DIRECTORY;
7049 YINIT_LIST_HEAD(&parent->variant.
7052 } else if (!parent || parent->variantType !=
7053 YAFFS_OBJECT_TYPE_DIRECTORY) {
7054 /* Hoosterman, another problem....
7055 * We're trying to use a non-directory as a directory
7058 T(YAFFS_TRACE_ERROR,
7060 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
7062 parent = dev->lostNFoundDir;
7065 yaffs_AddObjectToDirectory(parent, in);
7067 itsUnlinked = (parent == dev->deletedDir) ||
7068 (parent == dev->unlinkedDir);
7071 /* Mark the block as having a shrinkHeader */
7072 bi->hasShrinkHeader = 1;
7075 /* Note re hardlinks.
7076 * Since we might scan a hardlink before its equivalent object is scanned
7077 * we put them all in a list.
7078 * After scanning is complete, we should have all the objects, so we run
7079 * through this list and fix up all the chains.
7082 switch (in->variantType) {
7083 case YAFFS_OBJECT_TYPE_UNKNOWN:
7084 /* Todo got a problem */
7086 case YAFFS_OBJECT_TYPE_FILE:
7088 if (in->variant.fileVariant.
7089 scannedFileSize < fileSize) {
7090 /* This covers the case where the file size is greater
7091 * than where the data is
7092 * This will happen if the file is resized to be larger
7093 * than its current data extents.
7095 in->variant.fileVariant.fileSize = fileSize;
7096 in->variant.fileVariant.scannedFileSize = fileSize;
7099 if (in->variant.fileVariant.shrinkSize > fileSize)
7100 in->variant.fileVariant.shrinkSize = fileSize;
7104 case YAFFS_OBJECT_TYPE_HARDLINK:
7106 in->variant.hardLinkVariant.equivalentObjectId =
7108 in->hardLinks.next =
7109 (struct ylist_head *) hardList;
7113 case YAFFS_OBJECT_TYPE_DIRECTORY:
7116 case YAFFS_OBJECT_TYPE_SPECIAL:
7119 case YAFFS_OBJECT_TYPE_SYMLINK:
7121 in->variant.symLinkVariant.alias =
7122 yaffs_CloneString(oh->alias);
7123 if (!in->variant.symLinkVariant.alias)
7133 } /* End of scanning for each chunk */
7135 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
7136 /* If we got this far while scanning, then the block is fully allocated. */
7137 state = YAFFS_BLOCK_STATE_FULL;
7141 bi->blockState = state;
7143 /* Now let's see if it was dirty */
7144 if (bi->pagesInUse == 0 &&
7145 !bi->hasShrinkHeader &&
7146 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
7147 yaffs_BlockBecameDirty(dev, blk);
7152 yaffs_SkipRestOfBlock(dev);
7155 YFREE_ALT(blockIndex);
7159 /* Ok, we've done all the scanning.
7160 * Fix up the hard link chains.
7161 * We should now have scanned all the objects, now it's time to add these
7164 yaffs_HardlinkFixup(dev, hardList);
7167 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
7172 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
7177 /*------------------------------ Directory Functions ----------------------------- */
7179 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
7181 struct ylist_head *lh;
7182 yaffs_Object *listObj;
7187 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
7192 if (yaffs_SkipVerification(obj->myDev))
7196 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
7201 if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7202 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
7206 /* Iterate through the objects in each hash entry */
7208 ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
7210 listObj = ylist_entry(lh, yaffs_Object, siblings);
7211 yaffs_VerifyObject(listObj);
7218 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
7223 static void yaffs_VerifyDirectory(yaffs_Object *directory)
7225 struct ylist_head *lh;
7226 yaffs_Object *listObj;
7233 if (yaffs_SkipFullVerification(directory->myDev))
7236 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7237 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
7241 /* Iterate through the objects in each hash entry */
7243 ylist_for_each(lh, &directory->variant.directoryVariant.children) {
7245 listObj = ylist_entry(lh, yaffs_Object, siblings);
7246 if (listObj->parent != directory) {
7247 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
7250 yaffs_VerifyObjectInDirectory(listObj);
7256 *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
7257 * link (ie. name) is created or deleted in the directory.
7260 * create dir/a : update dir's mtime/ctime
7261 * rm dir/a: update dir's mtime/ctime
7262 * modify dir/a: don't update dir's mtimme/ctime
7264 * This can be handled immediately or defered. Defering helps reduce the number
7265 * of updates when many files in a directory are changed within a brief period.
7267 * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
7268 * called periodically.
7271 static void yaffs_UpdateParent(yaffs_Object *obj)
7279 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
7280 if(dev->param.deferDirectoryUpdate){
7281 struct ylist_head *link = &obj->variant.directoryVariant.dirty;
7283 if(ylist_empty(link)){
7284 ylist_add(link,&dev->dirtyDirectories);
7285 T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->objectId));
7289 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7292 void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
7294 struct ylist_head *link;
7296 yaffs_DirectoryStructure *dS;
7297 yaffs_ObjectVariant *oV;
7299 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
7301 while(!ylist_empty(&dev->dirtyDirectories)){
7302 link = dev->dirtyDirectories.next;
7303 ylist_del_init(link);
7305 dS=ylist_entry(link,yaffs_DirectoryStructure,dirty);
7306 oV = ylist_entry(dS,yaffs_ObjectVariant,directoryVariant);
7307 obj = ylist_entry(oV,yaffs_Object,variant);
7309 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
7312 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7316 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
7318 yaffs_Device *dev = obj->myDev;
7319 yaffs_Object *parent;
7321 yaffs_VerifyObjectInDirectory(obj);
7322 parent = obj->parent;
7324 yaffs_VerifyDirectory(parent);
7326 if (dev && dev->param.removeObjectCallback)
7327 dev->param.removeObjectCallback(obj);
7330 ylist_del_init(&obj->siblings);
7333 yaffs_VerifyDirectory(parent);
7336 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
7340 T(YAFFS_TRACE_ALWAYS,
7342 ("tragedy: Trying to add an object to a null pointer directory"
7347 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7348 T(YAFFS_TRACE_ALWAYS,
7350 ("tragedy: Trying to add an object to a non-directory"
7355 if (obj->siblings.prev == NULL) {
7356 /* Not initialised */
7361 yaffs_VerifyDirectory(directory);
7363 yaffs_RemoveObjectFromDirectory(obj);
7367 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7368 obj->parent = directory;
7370 if (directory == obj->myDev->unlinkedDir
7371 || directory == obj->myDev->deletedDir) {
7373 obj->myDev->nUnlinkedFiles++;
7374 obj->renameAllowed = 0;
7377 yaffs_VerifyDirectory(directory);
7378 yaffs_VerifyObjectInDirectory(obj);
7381 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7386 struct ylist_head *i;
7387 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7395 T(YAFFS_TRACE_ALWAYS,
7397 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7402 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7403 T(YAFFS_TRACE_ALWAYS,
7405 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7409 sum = yaffs_CalcNameSum(name);
7411 ylist_for_each(i, &directory->variant.directoryVariant.children) {
7413 l = ylist_entry(i, yaffs_Object, siblings);
7415 if (l->parent != directory)
7418 yaffs_CheckObjectDetailsLoaded(l);
7420 /* Special case for lost-n-found */
7421 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7422 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7424 } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7425 /* LostnFound chunk called Objxxx
7428 yaffs_GetObjectName(l, buffer,
7429 YAFFS_MAX_NAME_LENGTH + 1);
7430 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7441 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7442 int (*fn) (yaffs_Object *))
7444 struct ylist_head *i;
7448 T(YAFFS_TRACE_ALWAYS,
7450 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7455 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7456 T(YAFFS_TRACE_ALWAYS,
7458 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7463 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7465 l = ylist_entry(i, yaffs_Object, siblings);
7476 /* GetEquivalentObject dereferences any hard links to get to the
7480 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7482 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7483 /* We want the object id of the equivalent object, not this one */
7484 obj = obj->variant.hardLinkVariant.equivalentObject;
7485 yaffs_CheckObjectDetailsLoaded(obj);
7490 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7492 memset(name, 0, buffSize * sizeof(YCHAR));
7494 yaffs_CheckObjectDetailsLoaded(obj);
7496 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7497 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7498 } else if (obj->hdrChunk <= 0) {
7500 YCHAR numString[20];
7501 YCHAR *x = &numString[19];
7502 unsigned v = obj->objectId;
7506 *x = '0' + (v % 10);
7509 /* make up a name */
7510 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7511 yaffs_strcat(locName, x);
7512 yaffs_strncpy(name, locName, buffSize - 1);
7515 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7516 else if (obj->shortName[0])
7517 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7521 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7523 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7525 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7527 if (obj->hdrChunk > 0) {
7528 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7529 obj->hdrChunk, buffer,
7532 yaffs_strncpy(name, oh->name, buffSize - 1);
7535 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7538 return yaffs_strnlen(name,buffSize-1);
7541 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7543 /* Dereference any hard linking */
7544 obj = yaffs_GetEquivalentObject(obj);
7546 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7547 return obj->variant.fileVariant.fileSize;
7548 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7549 if(!obj->variant.symLinkVariant.alias)
7551 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7553 /* Only a directory should drop through to here */
7554 return obj->myDev->nDataBytesPerChunk;
7558 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7561 struct ylist_head *i;
7564 count++; /* the object itself */
7566 ylist_for_each(i, &obj->hardLinks)
7567 count++; /* add the hard links; */
7572 int yaffs_GetObjectInode(yaffs_Object *obj)
7574 obj = yaffs_GetEquivalentObject(obj);
7576 return obj->objectId;
7579 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7581 obj = yaffs_GetEquivalentObject(obj);
7583 switch (obj->variantType) {
7584 case YAFFS_OBJECT_TYPE_FILE:
7587 case YAFFS_OBJECT_TYPE_DIRECTORY:
7590 case YAFFS_OBJECT_TYPE_SYMLINK:
7593 case YAFFS_OBJECT_TYPE_HARDLINK:
7596 case YAFFS_OBJECT_TYPE_SPECIAL:
7597 if (S_ISFIFO(obj->yst_mode))
7599 if (S_ISCHR(obj->yst_mode))
7601 if (S_ISBLK(obj->yst_mode))
7603 if (S_ISSOCK(obj->yst_mode))
7611 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7613 obj = yaffs_GetEquivalentObject(obj);
7614 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7615 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7617 return yaffs_CloneString(_Y(""));
7620 #ifndef CONFIG_YAFFS_WINCE
7622 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7624 unsigned int valid = attr->ia_valid;
7626 if (valid & ATTR_MODE)
7627 obj->yst_mode = attr->ia_mode;
7628 if (valid & ATTR_UID)
7629 obj->yst_uid = attr->ia_uid;
7630 if (valid & ATTR_GID)
7631 obj->yst_gid = attr->ia_gid;
7633 if (valid & ATTR_ATIME)
7634 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7635 if (valid & ATTR_CTIME)
7636 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7637 if (valid & ATTR_MTIME)
7638 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7640 if (valid & ATTR_SIZE)
7641 yaffs_ResizeFile(obj, attr->ia_size);
7643 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7648 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7650 unsigned int valid = 0;
7652 attr->ia_mode = obj->yst_mode;
7654 attr->ia_uid = obj->yst_uid;
7656 attr->ia_gid = obj->yst_gid;
7659 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7660 valid |= ATTR_ATIME;
7661 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7662 valid |= ATTR_CTIME;
7663 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7664 valid |= ATTR_MTIME;
7666 attr->ia_size = yaffs_GetFileSize(obj);
7669 attr->ia_valid = valid;
7677 int yaffs_DumpObject(yaffs_Object *obj)
7681 yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7683 T(YAFFS_TRACE_ALWAYS,
7685 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7686 " chunk %d type %d size %d\n"
7687 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7688 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7689 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7695 /*---------------------------- Initialisation code -------------------------------------- */
7697 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7700 /* Common functions, gotta have */
7701 if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
7704 #ifdef CONFIG_YAFFS_YAFFS2
7706 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7707 if (dev->param.writeChunkWithTagsToNAND &&
7708 dev->param.readChunkWithTagsFromNAND &&
7709 !dev->param.writeChunkToNAND &&
7710 !dev->param.readChunkFromNAND &&
7711 dev->param.markNANDBlockBad &&
7712 dev->param.queryNANDBlock)
7716 /* Can use the "spare" style interface for yaffs1 */
7717 if (!dev->param.isYaffs2 &&
7718 !dev->param.writeChunkWithTagsToNAND &&
7719 !dev->param.readChunkWithTagsFromNAND &&
7720 dev->param.writeChunkToNAND &&
7721 dev->param.readChunkFromNAND &&
7722 !dev->param.markNANDBlockBad &&
7723 !dev->param.queryNANDBlock)
7730 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7732 /* Initialise the unlinked, deleted, root and lost and found directories */
7734 dev->lostNFoundDir = dev->rootDir = NULL;
7735 dev->unlinkedDir = dev->deletedDir = NULL;
7738 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7741 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7744 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7745 YAFFS_ROOT_MODE | S_IFDIR);
7746 dev->lostNFoundDir =
7747 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7748 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7750 if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7751 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7758 int yaffs_GutsInitialise(yaffs_Device *dev)
7760 int init_failed = 0;
7764 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7766 /* Check stuff that must be set */
7769 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7773 dev->internalStartBlock = dev->param.startBlock;
7774 dev->internalEndBlock = dev->param.endBlock;
7775 dev->blockOffset = 0;
7776 dev->chunkOffset = 0;
7777 dev->nFreeChunks = 0;
7781 if (dev->param.startBlock == 0) {
7782 dev->internalStartBlock = dev->param.startBlock + 1;
7783 dev->internalEndBlock = dev->param.endBlock + 1;
7784 dev->blockOffset = 1;
7785 dev->chunkOffset = dev->param.nChunksPerBlock;
7788 /* Check geometry parameters. */
7790 if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
7791 (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
7792 (dev->param.inbandTags && !dev->param.isYaffs2) ||
7793 dev->param.nChunksPerBlock < 2 ||
7794 dev->param.nReservedBlocks < 2 ||
7795 dev->internalStartBlock <= 0 ||
7796 dev->internalEndBlock <= 0 ||
7797 dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) { /* otherwise it is too small */
7798 T(YAFFS_TRACE_ALWAYS,
7800 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7801 TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
7805 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7806 T(YAFFS_TRACE_ALWAYS,
7807 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7811 /* Sort out space for inband tags, if required */
7812 if (dev->param.inbandTags)
7813 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7815 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
7817 /* Got the right mix of functions? */
7818 if (!yaffs_CheckDevFunctions(dev)) {
7819 /* Function missing */
7820 T(YAFFS_TRACE_ALWAYS,
7822 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7827 /* This is really a compilation check. */
7828 if (!yaffs_CheckStructures()) {
7829 T(YAFFS_TRACE_ALWAYS,
7830 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7834 if (dev->isMounted) {
7835 T(YAFFS_TRACE_ALWAYS,
7836 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7840 /* Finished with most checks. One or two more checks happen later on too. */
7844 /* OK now calculate a few things for the device */
7847 * Calculate all the chunk size manipulation numbers:
7849 x = dev->nDataBytesPerChunk;
7850 /* We always use dev->chunkShift and dev->chunkDiv */
7851 dev->chunkShift = Shifts(x);
7852 x >>= dev->chunkShift;
7854 /* We only use chunk mask if chunkDiv is 1 */
7855 dev->chunkMask = (1<<dev->chunkShift) - 1;
7858 * Calculate chunkGroupBits.
7859 * We need to find the next power of 2 > than internalEndBlock
7862 x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
7866 /* Set up tnode width if wide tnodes are enabled. */
7867 if (!dev->param.wideTnodesDisabled) {
7868 /* bits must be even so that we end up with 32-bit words */
7872 dev->tnodeWidth = 16;
7874 dev->tnodeWidth = bits;
7876 dev->tnodeWidth = 16;
7878 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7880 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7881 * so if the bitwidth of the
7882 * chunk range we're using is greater than 16 we need
7883 * to figure out chunk shift and chunkGroupSize
7886 if (bits <= dev->tnodeWidth)
7887 dev->chunkGroupBits = 0;
7889 dev->chunkGroupBits = bits - dev->tnodeWidth;
7892 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7894 if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
7895 /* We have a problem because the soft delete won't work if
7896 * the chunk group size > chunks per block.
7897 * This can be remedied by using larger "virtual blocks".
7899 T(YAFFS_TRACE_ALWAYS,
7900 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7905 /* OK, we've finished verifying the device, lets continue with initialisation */
7907 /* More device initialisation */
7908 dev->garbageCollections = 0;
7909 dev->passiveGarbageCollections = 0;
7910 dev->gcBlockFinder = 0;
7911 dev->bufferedBlock = -1;
7912 dev->doingBufferedBlockRewrite = 0;
7913 dev->nDeletedFiles = 0;
7914 dev->nBackgroundDeletions = 0;
7915 dev->nUnlinkedFiles = 0;
7917 dev->eccUnfixed = 0;
7918 dev->tagsEccFixed = 0;
7919 dev->tagsEccUnfixed = 0;
7920 dev->nErasureFailures = 0;
7921 dev->nErasedBlocks = 0;
7923 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7924 YINIT_LIST_HEAD(&dev->dirtyDirectories);
7925 dev->oldestDirtySequence = 0;
7926 dev->oldestDirtyBlock = 0;
7928 /* Initialise temporary buffers and caches. */
7929 if (!yaffs_InitialiseTempBuffers(dev))
7932 dev->srCache = NULL;
7933 dev->gcCleanupList = NULL;
7937 dev->param.nShortOpCaches > 0) {
7940 int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
7942 if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7943 dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7945 dev->srCache = YMALLOC(srCacheBytes);
7947 buf = (__u8 *) dev->srCache;
7950 memset(dev->srCache, 0, srCacheBytes);
7952 for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
7953 dev->srCache[i].object = NULL;
7954 dev->srCache[i].lastUse = 0;
7955 dev->srCache[i].dirty = 0;
7956 dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
7967 dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
7968 if (!dev->gcCleanupList)
7972 if (dev->param.isYaffs2)
7973 dev->param.useHeaderFileSize = 1;
7975 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7978 yaffs_InitialiseTnodes(dev);
7979 yaffs_InitialiseObjects(dev);
7981 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7986 /* Now scan the flash. */
7987 if (dev->param.isYaffs2) {
7988 if (yaffs_CheckpointRestore(dev)) {
7989 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7990 T(YAFFS_TRACE_ALWAYS,
7991 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7994 /* Clean up the mess caused by an aborted checkpoint load
7995 * and scan backwards.
7997 yaffs_DeinitialiseBlocks(dev);
7998 yaffs_DeinitialiseTnodes(dev);
7999 yaffs_DeinitialiseObjects(dev);
8002 dev->nErasedBlocks = 0;
8003 dev->nFreeChunks = 0;
8004 dev->allocationBlock = -1;
8005 dev->allocationPage = -1;
8006 dev->nDeletedFiles = 0;
8007 dev->nUnlinkedFiles = 0;
8008 dev->nBackgroundDeletions = 0;
8010 if (!init_failed && !yaffs_InitialiseBlocks(dev))
8013 yaffs_InitialiseTnodes(dev);
8014 yaffs_InitialiseObjects(dev);
8016 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
8019 if (!init_failed && !yaffs_ScanBackwards(dev))
8022 } else if (!yaffs_Scan(dev))
8025 yaffs_StripDeletedObjects(dev);
8026 yaffs_FixHangingObjects(dev);
8027 if(dev->param.emptyLostAndFound)
8028 yaffs_EmptyLostAndFound(dev);
8032 /* Clean up the mess */
8033 T(YAFFS_TRACE_TRACING,
8034 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
8036 yaffs_Deinitialise(dev);
8040 /* Zero out stats */
8041 dev->nPageReads = 0;
8042 dev->nPageWrites = 0;
8043 dev->nBlockErasures = 0;
8045 dev->nRetriedWrites = 0;
8047 dev->nRetiredBlocks = 0;
8049 yaffs_VerifyFreeChunks(dev);
8050 yaffs_VerifyBlocks(dev);
8052 /* Clean up any aborted checkpoint data */
8053 if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
8054 yaffs_InvalidateCheckpoint(dev);
8056 T(YAFFS_TRACE_TRACING,
8057 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
8062 void yaffs_Deinitialise(yaffs_Device *dev)
8064 if (dev->isMounted) {
8067 yaffs_DeinitialiseBlocks(dev);
8068 yaffs_DeinitialiseTnodes(dev);
8069 yaffs_DeinitialiseObjects(dev);
8070 if (dev->param.nShortOpCaches > 0 &&
8073 for (i = 0; i < dev->param.nShortOpCaches; i++) {
8074 if (dev->srCache[i].data)
8075 YFREE(dev->srCache[i].data);
8076 dev->srCache[i].data = NULL;
8079 YFREE(dev->srCache);
8080 dev->srCache = NULL;
8083 YFREE(dev->gcCleanupList);
8085 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
8086 YFREE(dev->tempBuffer[i].buffer);
8090 if (dev->param.deinitialiseNAND)
8091 dev->param.deinitialiseNAND(dev);
8095 static int yaffs_CountFreeChunks(yaffs_Device *dev)
8100 yaffs_BlockInfo *blk;
8102 blk = dev->blockInfo;
8103 for (b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) {
8104 switch (blk->blockState) {
8105 case YAFFS_BLOCK_STATE_EMPTY:
8106 case YAFFS_BLOCK_STATE_ALLOCATING:
8107 case YAFFS_BLOCK_STATE_COLLECTING:
8108 case YAFFS_BLOCK_STATE_FULL:
8110 (dev->param.nChunksPerBlock - blk->pagesInUse +
8111 blk->softDeletions);
8122 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
8124 /* This is what we report to the outside world */
8127 int nDirtyCacheChunks;
8128 int blocksForCheckpoint;
8132 nFree = dev->nFreeChunks;
8134 nFree = yaffs_CountFreeChunks(dev);
8137 nFree += dev->nDeletedFiles;
8139 /* Now count the number of dirty chunks in the cache and subtract those */
8141 for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
8142 if (dev->srCache[i].dirty)
8143 nDirtyCacheChunks++;
8146 nFree -= nDirtyCacheChunks;
8148 nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
8150 /* Now we figure out how much to reserve for the checkpoint and report that... */
8151 blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
8152 if (blocksForCheckpoint < 0)
8153 blocksForCheckpoint = 0;
8155 nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
8164 static int yaffs_freeVerificationFailures;
8166 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
8171 if (yaffs_SkipVerification(dev))
8174 counted = yaffs_CountFreeChunks(dev);
8176 difference = dev->nFreeChunks - counted;
8179 T(YAFFS_TRACE_ALWAYS,
8180 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
8181 dev->nFreeChunks, counted, difference));
8182 yaffs_freeVerificationFailures++;
8186 /*---------------------------------------- YAFFS test code ----------------------*/
8188 #define yaffs_CheckStruct(structure, syze, name) \
8190 if (sizeof(structure) != syze) { \
8191 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
8192 name, syze, (int) sizeof(structure))); \
8193 return YAFFS_FAIL; \
8197 static int yaffs_CheckStructures(void)
8199 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
8200 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
8201 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
8202 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
8203 /* yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
8205 #ifndef CONFIG_YAFFS_WINCE
8206 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");