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 1.115 2010-03-07 23:43:34 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 #define YAFFS_PASSIVE_GC_CHUNKS 2
39 #include "yaffs_ecc.h"
42 /* Robustification (if it ever comes about...) */
43 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
44 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
46 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
48 const yaffs_ExtendedTags *tags);
49 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
50 const yaffs_ExtendedTags *tags);
52 /* Other local prototypes */
53 static void yaffs_UpdateParent(yaffs_Object *obj);
54 static int yaffs_UnlinkObject(yaffs_Object *obj);
55 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
57 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
59 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
61 yaffs_ExtendedTags *tags,
63 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
64 int chunkInNAND, int inScan);
66 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
67 yaffs_ObjectType type);
68 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
70 static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
71 int force, int isShrink, int shadows);
72 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
73 static int yaffs_CheckStructures(void);
74 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
75 int chunkOffset, int *limit);
76 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
78 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
81 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
84 static int yaffs_UnlinkWorker(yaffs_Object *obj);
86 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
89 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
90 yaffs_BlockInfo **blockUsedPtr);
92 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
94 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
96 static void yaffs_VerifyDirectory(yaffs_Object *directory);
98 static int yaffs_CheckFileSanity(yaffs_Object *in);
100 #define yaffs_CheckFileSanity(in)
103 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
104 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
106 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
108 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
109 yaffs_ExtendedTags *tags);
111 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
113 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
114 yaffs_FileStructure *fStruct,
117 static void yaffs_SkipRestOfBlock(yaffs_Device *dev);
118 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
121 yaffs_ExtendedTags *tags);
123 /* Function to calculate chunk and offset */
125 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
131 chunk = (__u32)(addr >> dev->chunkShift);
133 if (dev->chunkDiv == 1) {
134 /* easy power of 2 case */
135 offset = (__u32)(addr & dev->chunkMask);
137 /* Non power-of-2 case */
141 chunk /= dev->chunkDiv;
143 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
144 offset = (__u32)(addr - chunkBase);
151 /* Function to return the number of shifts for a power of 2 greater than or
152 * equal to the given number
153 * Note we don't try to cater for all possible numbers and this does not have to
154 * be hellishly efficient.
157 static __u32 ShiftsGE(__u32 x)
162 nShifts = extraBits = 0;
177 /* Function to return the number of shifts to get a 1 in bit 0
180 static __u32 Shifts(__u32 x)
200 * Temporary buffer manipulations.
203 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
206 __u8 *buf = (__u8 *)1;
208 memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
210 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
211 dev->tempBuffer[i].line = 0; /* not in use */
212 dev->tempBuffer[i].buffer = buf =
213 YMALLOC_DMA(dev->param.totalBytesPerChunk);
216 return buf ? YAFFS_OK : YAFFS_FAIL;
219 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
224 if (dev->tempInUse > dev->maxTemp)
225 dev->maxTemp = dev->tempInUse;
227 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
228 if (dev->tempBuffer[i].line == 0) {
229 dev->tempBuffer[i].line = lineNo;
230 if ((i + 1) > dev->maxTemp) {
231 dev->maxTemp = i + 1;
232 for (j = 0; j <= i; j++)
233 dev->tempBuffer[j].maxLine =
234 dev->tempBuffer[j].line;
237 return dev->tempBuffer[i].buffer;
241 T(YAFFS_TRACE_BUFFERS,
242 (TSTR("Out of temp buffers at line %d, other held by lines:"),
244 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
245 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
247 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
250 * If we got here then we have to allocate an unmanaged one
254 dev->unmanagedTempAllocations++;
255 return YMALLOC(dev->nDataBytesPerChunk);
259 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
266 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
267 if (dev->tempBuffer[i].buffer == buffer) {
268 dev->tempBuffer[i].line = 0;
274 /* assume it is an unmanaged one. */
275 T(YAFFS_TRACE_BUFFERS,
276 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
279 dev->unmanagedTempDeallocations++;
285 * Determine if we have a managed buffer.
287 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
291 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
292 if (dev->tempBuffer[i].buffer == buffer)
296 for (i = 0; i < dev->param.nShortOpCaches; i++) {
297 if (dev->srCache[i].data == buffer)
301 if (buffer == dev->checkpointBuffer)
304 T(YAFFS_TRACE_ALWAYS,
305 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
312 * Chunk bitmap manipulations
315 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
317 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
319 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
323 return dev->chunkBits +
324 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
327 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
329 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
330 chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
332 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
338 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
340 __u8 *blkBits = yaffs_BlockBits(dev, blk);
342 memset(blkBits, 0, dev->chunkBitmapStride);
345 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
347 __u8 *blkBits = yaffs_BlockBits(dev, blk);
349 yaffs_VerifyChunkBitId(dev, blk, chunk);
351 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
354 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
356 __u8 *blkBits = yaffs_BlockBits(dev, blk);
358 yaffs_VerifyChunkBitId(dev, blk, chunk);
360 blkBits[chunk / 8] |= (1 << (chunk & 7));
363 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
365 __u8 *blkBits = yaffs_BlockBits(dev, blk);
366 yaffs_VerifyChunkBitId(dev, blk, chunk);
368 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
371 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
373 __u8 *blkBits = yaffs_BlockBits(dev, blk);
375 for (i = 0; i < dev->chunkBitmapStride; i++) {
383 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
385 __u8 *blkBits = yaffs_BlockBits(dev, blk);
388 for (i = 0; i < dev->chunkBitmapStride; i++) {
405 static int yaffs_SkipVerification(yaffs_Device *dev)
408 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
411 static int yaffs_SkipFullVerification(yaffs_Device *dev)
414 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
417 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
420 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
423 static const char *blockStateName[] = {
436 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
441 if (yaffs_SkipVerification(dev))
444 /* Report illegal runtime states */
445 if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
446 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
448 switch (bi->blockState) {
449 case YAFFS_BLOCK_STATE_UNKNOWN:
450 case YAFFS_BLOCK_STATE_SCANNING:
451 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
452 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
453 n, blockStateName[bi->blockState]));
456 /* Check pages in use and soft deletions are legal */
458 actuallyUsed = bi->pagesInUse - bi->softDeletions;
460 if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock ||
461 bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
462 actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock)
463 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
464 n, bi->pagesInUse, bi->softDeletions));
467 /* Check chunk bitmap legal */
468 inUse = yaffs_CountChunkBits(dev, n);
469 if (inUse != bi->pagesInUse)
470 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
471 n, bi->pagesInUse, inUse));
473 /* Check that the sequence number is valid.
474 * Ten million is legal, but is very unlikely
476 if (dev->param.isYaffs2 &&
477 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
478 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
479 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
480 n, bi->sequenceNumber));
483 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
486 yaffs_VerifyBlock(dev, bi, n);
488 /* After collection the block should be in the erased state */
489 /* This will need to change if we do partial gc */
491 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
492 bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
493 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
498 static void yaffs_VerifyBlocks(yaffs_Device *dev)
501 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
502 int nIllegalBlockStates = 0;
504 if (yaffs_SkipVerification(dev))
507 memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
509 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
510 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
511 yaffs_VerifyBlock(dev, bi, i);
513 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
514 nBlocksPerState[bi->blockState]++;
516 nIllegalBlockStates++;
519 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
520 T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
522 T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
523 if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
524 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
526 for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
527 T(YAFFS_TRACE_VERIFY,
528 (TSTR("%s %d blocks"TENDSTR),
529 blockStateName[i], nBlocksPerState[i]));
531 if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
532 T(YAFFS_TRACE_VERIFY,
533 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
534 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
536 if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
537 T(YAFFS_TRACE_VERIFY,
538 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
539 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
541 if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
542 T(YAFFS_TRACE_VERIFY,
543 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
544 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
546 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
551 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
552 * case those tests will not be performed.
554 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
556 if (obj && yaffs_SkipVerification(obj->myDev))
559 if (!(tags && obj && oh)) {
560 T(YAFFS_TRACE_VERIFY,
561 (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
566 if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
567 oh->type > YAFFS_OBJECT_TYPE_MAX)
568 T(YAFFS_TRACE_VERIFY,
569 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
570 tags->objectId, oh->type));
572 if (tags->objectId != obj->objectId)
573 T(YAFFS_TRACE_VERIFY,
574 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
575 tags->objectId, obj->objectId));
579 * Check that the object's parent ids match if parentCheck requested.
581 * Tests do not apply to the root object.
584 if (parentCheck && tags->objectId > 1 && !obj->parent)
585 T(YAFFS_TRACE_VERIFY,
586 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
587 tags->objectId, oh->parentObjectId));
589 if (parentCheck && obj->parent &&
590 oh->parentObjectId != obj->parent->objectId &&
591 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
592 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
593 T(YAFFS_TRACE_VERIFY,
594 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
595 tags->objectId, oh->parentObjectId, obj->parent->objectId));
597 if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
598 T(YAFFS_TRACE_VERIFY,
599 (TSTR("Obj %d header name is NULL"TENDSTR),
602 if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
603 T(YAFFS_TRACE_VERIFY,
604 (TSTR("Obj %d header name is 0xFF"TENDSTR),
610 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
611 __u32 level, int chunkOffset)
614 yaffs_Device *dev = obj->myDev;
620 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
621 if (tn->internal[i]) {
622 ok = yaffs_VerifyTnodeWorker(obj,
625 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
628 } else if (level == 0) {
629 yaffs_ExtendedTags tags;
630 __u32 objectId = obj->objectId;
632 chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
634 for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
635 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
638 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
639 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
640 if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
641 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
642 objectId, chunkOffset, theChunk,
643 tags.objectId, tags.chunkId));
656 static void yaffs_VerifyFile(yaffs_Object *obj)
658 int requiredTallness;
664 yaffs_ExtendedTags tags;
671 if (yaffs_SkipVerification(obj->myDev))
675 objectId = obj->objectId;
677 /* Check file size is consistent with tnode depth */
678 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
679 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
680 requiredTallness = 0;
682 x >>= YAFFS_TNODES_INTERNAL_BITS;
686 actualTallness = obj->variant.fileVariant.topLevel;
688 /* Check that the chunks in the tnode tree are all correct.
689 * We do this by scanning through the tnode tree and
690 * checking the tags for every chunk match.
693 if (yaffs_SkipNANDVerification(dev))
696 for (i = 1; i <= lastChunk; i++) {
697 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
700 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
702 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
703 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
704 if (tags.objectId != objectId || tags.chunkId != i) {
705 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
706 objectId, i, theChunk,
707 tags.objectId, tags.chunkId));
715 static void yaffs_VerifyHardLink(yaffs_Object *obj)
717 if (obj && yaffs_SkipVerification(obj->myDev))
720 /* Verify sane equivalent object */
723 static void yaffs_VerifySymlink(yaffs_Object *obj)
725 if (obj && yaffs_SkipVerification(obj->myDev))
728 /* Verify symlink string */
731 static void yaffs_VerifySpecial(yaffs_Object *obj)
733 if (obj && yaffs_SkipVerification(obj->myDev))
737 static void yaffs_VerifyObject(yaffs_Object *obj)
746 __u32 chunkShouldNotBeDeleted;
752 if (obj->beingCreated)
757 if (yaffs_SkipVerification(dev))
760 /* Check sane object header chunk */
762 chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
763 chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
765 chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
766 chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
767 chunkValid = chunkInRange &&
768 yaffs_CheckChunkBit(dev,
769 obj->hdrChunk / dev->param.nChunksPerBlock,
770 obj->hdrChunk % dev->param.nChunksPerBlock);
771 chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
774 (!chunkIdOk || chunkShouldNotBeDeleted)) {
775 T(YAFFS_TRACE_VERIFY,
776 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
777 obj->objectId, obj->hdrChunk,
778 chunkIdOk ? "" : ",out of range",
779 chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
782 if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
783 yaffs_ExtendedTags tags;
784 yaffs_ObjectHeader *oh;
785 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
787 oh = (yaffs_ObjectHeader *)buffer;
789 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
792 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
794 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
797 /* Verify it has a parent */
798 if (obj && !obj->fake &&
799 (!obj->parent || obj->parent->myDev != dev)) {
800 T(YAFFS_TRACE_VERIFY,
801 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
802 obj->objectId, obj->parent));
805 /* Verify parent is a directory */
806 if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
807 T(YAFFS_TRACE_VERIFY,
808 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
809 obj->objectId, obj->parent->variantType));
812 switch (obj->variantType) {
813 case YAFFS_OBJECT_TYPE_FILE:
814 yaffs_VerifyFile(obj);
816 case YAFFS_OBJECT_TYPE_SYMLINK:
817 yaffs_VerifySymlink(obj);
819 case YAFFS_OBJECT_TYPE_DIRECTORY:
820 yaffs_VerifyDirectory(obj);
822 case YAFFS_OBJECT_TYPE_HARDLINK:
823 yaffs_VerifyHardLink(obj);
825 case YAFFS_OBJECT_TYPE_SPECIAL:
826 yaffs_VerifySpecial(obj);
828 case YAFFS_OBJECT_TYPE_UNKNOWN:
830 T(YAFFS_TRACE_VERIFY,
831 (TSTR("Obj %d has illegaltype %d"TENDSTR),
832 obj->objectId, obj->variantType));
837 static void yaffs_VerifyObjects(yaffs_Device *dev)
841 struct ylist_head *lh;
843 if (yaffs_SkipVerification(dev))
846 /* Iterate through the objects in each hash entry */
848 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
849 ylist_for_each(lh, &dev->objectBucket[i].list) {
851 obj = ylist_entry(lh, yaffs_Object, hashLink);
852 yaffs_VerifyObject(obj);
860 * Simple hash function. Needs to have a reasonable spread
863 static Y_INLINE int yaffs_HashFunction(int n)
866 return n % YAFFS_NOBJECT_BUCKETS;
870 * Access functions to useful fake objects.
871 * Note that root might have a presence in NAND if permissions are set.
874 yaffs_Object *yaffs_Root(yaffs_Device *dev)
879 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
881 return dev->lostNFoundDir;
886 * Erased NAND checking functions
889 int yaffs_CheckFF(__u8 *buffer, int nBytes)
891 /* Horrible, slow implementation */
900 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
903 int retval = YAFFS_OK;
904 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
905 yaffs_ExtendedTags tags;
908 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
910 if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
913 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
914 T(YAFFS_TRACE_NANDACCESS,
915 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
919 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
926 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
929 yaffs_ExtendedTags *tags)
931 int retval = YAFFS_OK;
932 yaffs_ExtendedTags tempTags;
933 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
936 result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
937 if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
938 tempTags.objectId != tags->objectId ||
939 tempTags.chunkId != tags->chunkId ||
940 tempTags.byteCount != tags->byteCount)
943 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
948 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
950 yaffs_ExtendedTags *tags,
957 yaffs_InvalidateCheckpoint(dev);
960 yaffs_BlockInfo *bi = 0;
963 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
969 /* First check this chunk is erased, if it needs
970 * checking. The checking policy (unless forced
971 * always on) is as follows:
973 * Check the first page we try to write in a block.
974 * If the check passes then we don't need to check any
975 * more. If the check fails, we check again...
976 * If the block has been erased, we don't need to check.
978 * However, if the block has been prioritised for gc,
979 * then we think there might be something odd about
980 * this block and stop using it.
982 * Rationale: We should only ever see chunks that have
983 * not been erased if there was a partially written
984 * chunk due to power loss. This checking policy should
985 * catch that case with very few checks and thus save a
986 * lot of checks that are most likely not needed.
989 * If an erase check fails or the write fails we skip the
993 /* let's give it a try */
996 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
997 bi->skipErasedCheck = 0;
999 if (!bi->skipErasedCheck) {
1000 erasedOk = yaffs_CheckChunkErased(dev, chunk);
1001 if (erasedOk != YAFFS_OK) {
1002 T(YAFFS_TRACE_ERROR,
1003 (TSTR("**>> yaffs chunk %d was not erased"
1006 /* If not erased, delete this one,
1007 * skip rest of block and
1008 * try another chunk */
1009 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
1010 yaffs_SkipRestOfBlock(dev);
1015 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
1018 if(!bi->skipErasedCheck)
1019 writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
1021 if (writeOk != YAFFS_OK) {
1022 /* Clean up aborted write, skip to next block and
1023 * try another chunk */
1024 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
1028 bi->skipErasedCheck = 1;
1030 /* Copy the data into the robustification buffer */
1031 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
1033 } while (writeOk != YAFFS_OK &&
1034 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1040 T(YAFFS_TRACE_ERROR,
1041 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1044 dev->nRetriedWrites += (attempts - 1);
1052 * Oldest Dirty Sequence Number handling.
1055 /* yaffs_CalcOldestDirtySequence()
1056 * yaffs_FindOldestDirtySequence()
1057 * Calculate the oldest dirty sequence number if we don't know it.
1059 static int yaffs_CalcOldestDirtySequence(yaffs_Device *dev)
1063 yaffs_BlockInfo *b = 0;
1065 if(!dev->param.isYaffs2)
1068 /* Find the oldest dirty sequence number. */
1069 seq = dev->sequenceNumber;
1070 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
1071 b = yaffs_GetBlockInfo(dev, i);
1072 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1073 (b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
1074 b->sequenceNumber < seq)
1075 seq = b->sequenceNumber;
1081 static void yaffs_FindOldestDirtySequence(yaffs_Device *dev)
1083 if(dev->param.isYaffs2 && !dev->oldestDirtySequence)
1084 dev->oldestDirtySequence =
1085 yaffs_CalcOldestDirtySequence(dev);
1088 if(!yaffs_SkipVerification(dev) &&
1089 dev->oldestDirtySequence != yaffs_CalcOldestDirtySequence(dev))
1096 * yaffs_ClearOldestDirtySequence()
1097 * Called when a block is erased or marked bad. (ie. when its sequenceNumber
1098 * becomes invalid). If the value matches the oldest then we clear
1099 * dev->oldestDirtySequence to force its recomputation.
1101 static void yaffs_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
1104 if(!dev->param.isYaffs2)
1107 if(!bi || bi->sequenceNumber == dev->oldestDirtySequence)
1108 dev->oldestDirtySequence = 0;
1112 * yaffs_UpdateOldestDirtySequence()
1113 * Update the oldest dirty sequence number whenever we dirty a block.
1114 * Only do this if the oldestDirtySequence is actually being tracked.
1116 static void yaffs_UpdateOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
1118 if(dev->param.isYaffs2 && dev->oldestDirtySequence){
1119 if(dev->oldestDirtySequence > bi->sequenceNumber)
1120 dev->oldestDirtySequence = bi->sequenceNumber;
1125 * Block retiring for handling a broken block.
1128 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1130 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1132 yaffs_InvalidateCheckpoint(dev);
1134 yaffs_ClearOldestDirtySequence(dev,bi);
1136 if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1137 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1138 T(YAFFS_TRACE_ALWAYS, (TSTR(
1139 "yaffs: Failed to mark bad and erase block %d"
1140 TENDSTR), blockInNAND));
1142 yaffs_ExtendedTags tags;
1143 int chunkId = blockInNAND * dev->param.nChunksPerBlock;
1145 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1147 memset(buffer, 0xff, dev->nDataBytesPerChunk);
1148 yaffs_InitialiseTags(&tags);
1149 tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1150 if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
1151 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1152 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1153 TCONT("write bad block marker to block %d")
1154 TENDSTR), blockInNAND));
1156 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1160 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1161 bi->gcPrioritise = 0;
1162 bi->needsRetiring = 0;
1164 dev->nRetiredBlocks++;
1168 * Functions for robustisizing TODO
1172 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1174 const yaffs_ExtendedTags *tags)
1177 chunkInNAND=chunkInNAND;
1182 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1183 const yaffs_ExtendedTags *tags)
1186 chunkInNAND=chunkInNAND;
1190 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1192 if (!bi->gcPrioritise) {
1193 bi->gcPrioritise = 1;
1194 dev->hasPendingPrioritisedGCs = 1;
1195 bi->chunkErrorStrikes++;
1197 if (bi->chunkErrorStrikes > 3) {
1198 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1199 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1205 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1208 int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
1209 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1211 yaffs_HandleChunkError(dev, bi);
1214 /* Was an actual write failure, so mark the block for retirement */
1215 bi->needsRetiring = 1;
1216 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1217 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1220 /* Delete the chunk */
1221 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1222 yaffs_SkipRestOfBlock(dev);
1226 /*---------------- Name handling functions ------------*/
1228 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1233 const YUCHAR *bname = (const YUCHAR *) name;
1235 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1237 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1238 sum += yaffs_toupper(*bname) * i;
1240 sum += (*bname) * i;
1249 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1251 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1252 memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1253 if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
1254 yaffs_strcpy(obj->shortName, name);
1256 obj->shortName[0] = _Y('\0');
1258 obj->sum = yaffs_CalcNameSum(name);
1261 /*-------------------- TNODES -------------------
1263 * List of spare tnodes
1264 * The list is hooked together using the first pointer
1268 /* yaffs_CreateTnodes creates a bunch more tnodes and
1269 * adds them to the tnode free list.
1270 * Don't use this function directly
1272 static Y_INLINE int yaffs_CalcTnodeSize(yaffs_Device *dev)
1275 /* Calculate the tnode size in bytes for variable width tnode support.
1276 * Must be a multiple of 32-bits */
1277 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1279 if (tnodeSize < sizeof(yaffs_Tnode))
1280 tnodeSize = sizeof(yaffs_Tnode);
1284 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1287 int tnodeSize = yaffs_CalcTnodeSize(dev);
1288 yaffs_Tnode *newTnodes;
1292 yaffs_TnodeList *tnl;
1298 /* make these things */
1300 newTnodes = YMALLOC(nTnodes * tnodeSize);
1301 mem = (__u8 *)newTnodes;
1304 T(YAFFS_TRACE_ERROR,
1305 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1309 /* Hook them into the free list */
1311 for (i = 0; i < nTnodes - 1; i++) {
1312 newTnodes[i].internal[0] = &newTnodes[i + 1];
1313 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1314 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1318 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1319 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1320 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1322 dev->freeTnodes = newTnodes;
1324 /* New hookup for wide tnodes */
1325 for (i = 0; i < nTnodes - 1; i++) {
1326 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1327 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1328 curr->internal[0] = next;
1331 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1332 curr->internal[0] = dev->freeTnodes;
1333 dev->freeTnodes = (yaffs_Tnode *)mem;
1338 dev->nFreeTnodes += nTnodes;
1339 dev->nTnodesCreated += nTnodes;
1341 /* Now add this bunch of tnodes to a list for freeing up.
1342 * NB If we can't add this to the management list it isn't fatal
1343 * but it just means we can't free this bunch of tnodes later.
1346 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1348 T(YAFFS_TRACE_ERROR,
1350 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1353 tnl->tnodes = newTnodes;
1354 tnl->next = dev->allocatedTnodeList;
1355 dev->allocatedTnodeList = tnl;
1358 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1363 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1365 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1367 yaffs_Tnode *tn = NULL;
1369 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1370 tn = YMALLOC(yaffs_CalcTnodeSize(dev));
1372 dev->nTnodesCreated++;
1374 /* If there are none left make more */
1375 if (!dev->freeTnodes)
1376 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1378 if (dev->freeTnodes) {
1379 tn = dev->freeTnodes;
1380 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1381 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1382 /* Hoosterman, this thing looks like it isn't in the list */
1383 T(YAFFS_TRACE_ALWAYS,
1384 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1387 dev->freeTnodes = dev->freeTnodes->internal[0];
1391 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1396 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1398 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1399 int tnodeSize = yaffs_CalcTnodeSize(dev);
1402 memset(tn, 0, tnodeSize);
1407 /* FreeTnode frees up a tnode and puts it back on the free list */
1408 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1411 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1413 dev->nTnodesCreated--;
1415 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1416 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1417 /* Hoosterman, this thing looks like it is already in the list */
1418 T(YAFFS_TRACE_ALWAYS,
1419 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1421 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1423 tn->internal[0] = dev->freeTnodes;
1424 dev->freeTnodes = tn;
1428 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1431 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1433 /* Free the list of allocated tnodes */
1434 yaffs_TnodeList *tmp;
1436 while (dev->allocatedTnodeList) {
1437 tmp = dev->allocatedTnodeList->next;
1439 YFREE(dev->allocatedTnodeList->tnodes);
1440 YFREE(dev->allocatedTnodeList);
1441 dev->allocatedTnodeList = tmp;
1445 dev->freeTnodes = NULL;
1446 dev->nFreeTnodes = 0;
1447 dev->nTnodesCreated = 0;
1450 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1452 dev->allocatedTnodeList = NULL;
1453 dev->freeTnodes = NULL;
1454 dev->nFreeTnodes = 0;
1455 dev->nTnodesCreated = 0;
1459 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1462 __u32 *map = (__u32 *)tn;
1468 pos &= YAFFS_TNODES_LEVEL0_MASK;
1469 val >>= dev->chunkGroupBits;
1471 bitInMap = pos * dev->tnodeWidth;
1472 wordInMap = bitInMap / 32;
1473 bitInWord = bitInMap & (32 - 1);
1475 mask = dev->tnodeMask << bitInWord;
1477 map[wordInMap] &= ~mask;
1478 map[wordInMap] |= (mask & (val << bitInWord));
1480 if (dev->tnodeWidth > (32 - bitInWord)) {
1481 bitInWord = (32 - bitInWord);
1483 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1484 map[wordInMap] &= ~mask;
1485 map[wordInMap] |= (mask & (val >> bitInWord));
1489 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1492 __u32 *map = (__u32 *)tn;
1498 pos &= YAFFS_TNODES_LEVEL0_MASK;
1500 bitInMap = pos * dev->tnodeWidth;
1501 wordInMap = bitInMap / 32;
1502 bitInWord = bitInMap & (32 - 1);
1504 val = map[wordInMap] >> bitInWord;
1506 if (dev->tnodeWidth > (32 - bitInWord)) {
1507 bitInWord = (32 - bitInWord);
1509 val |= (map[wordInMap] << bitInWord);
1512 val &= dev->tnodeMask;
1513 val <<= dev->chunkGroupBits;
1518 /* ------------------- End of individual tnode manipulation -----------------*/
1520 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1521 * The look up tree is represented by the top tnode and the number of topLevel
1522 * in the tree. 0 means only the level 0 tnode is in the tree.
1525 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1526 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1527 yaffs_FileStructure *fStruct,
1530 yaffs_Tnode *tn = fStruct->top;
1532 int requiredTallness;
1533 int level = fStruct->topLevel;
1537 /* Check sane level and chunk Id */
1538 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1541 if (chunkId > YAFFS_MAX_CHUNK_ID)
1544 /* First check we're tall enough (ie enough topLevel) */
1546 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1547 requiredTallness = 0;
1549 i >>= YAFFS_TNODES_INTERNAL_BITS;
1553 if (requiredTallness > fStruct->topLevel)
1554 return NULL; /* Not tall enough, so we can't find it */
1556 /* Traverse down to level 0 */
1557 while (level > 0 && tn) {
1558 tn = tn->internal[(chunkId >>
1559 (YAFFS_TNODES_LEVEL0_BITS +
1561 YAFFS_TNODES_INTERNAL_BITS)) &
1562 YAFFS_TNODES_INTERNAL_MASK];
1569 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1570 * This happens in two steps:
1571 * 1. If the tree isn't tall enough, then make it taller.
1572 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1574 * Used when modifying the tree.
1576 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1577 * be plugged into the ttree.
1580 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1581 yaffs_FileStructure *fStruct,
1583 yaffs_Tnode *passedTn)
1585 int requiredTallness;
1593 /* Check sane level and page Id */
1594 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1597 if (chunkId > YAFFS_MAX_CHUNK_ID)
1600 /* First check we're tall enough (ie enough topLevel) */
1602 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1603 requiredTallness = 0;
1605 x >>= YAFFS_TNODES_INTERNAL_BITS;
1610 if (requiredTallness > fStruct->topLevel) {
1611 /* Not tall enough, gotta make the tree taller */
1612 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1614 tn = yaffs_GetTnode(dev);
1617 tn->internal[0] = fStruct->top;
1619 fStruct->topLevel++;
1621 T(YAFFS_TRACE_ERROR,
1622 (TSTR("yaffs: no more tnodes" TENDSTR)));
1628 /* Traverse down to level 0, adding anything we need */
1630 l = fStruct->topLevel;
1634 while (l > 0 && tn) {
1636 (YAFFS_TNODES_LEVEL0_BITS +
1637 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1638 YAFFS_TNODES_INTERNAL_MASK;
1641 if ((l > 1) && !tn->internal[x]) {
1642 /* Add missing non-level-zero tnode */
1643 tn->internal[x] = yaffs_GetTnode(dev);
1644 if(!tn->internal[x])
1646 } else if (l == 1) {
1647 /* Looking from level 1 at level 0 */
1649 /* If we already have one, then release it.*/
1650 if (tn->internal[x])
1651 yaffs_FreeTnode(dev, tn->internal[x]);
1652 tn->internal[x] = passedTn;
1654 } else if (!tn->internal[x]) {
1655 /* Don't have one, none passed in */
1656 tn->internal[x] = yaffs_GetTnode(dev);
1657 if(!tn->internal[x])
1662 tn = tn->internal[x];
1666 /* top is level 0 */
1668 memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1669 yaffs_FreeTnode(dev, passedTn);
1676 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1677 yaffs_ExtendedTags *tags, int objectId,
1682 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1683 if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
1684 theChunk % dev->param.nChunksPerBlock)) {
1686 if(dev->chunkGroupSize == 1)
1689 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1691 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1703 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1704 * chunks and tnodes in the file
1705 * Returns 1 if the tree was deleted.
1706 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1709 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1710 int chunkOffset, int *limit)
1715 yaffs_ExtendedTags tags;
1717 yaffs_Device *dev = in->myDev;
1723 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1725 if (tn->internal[i]) {
1726 if (limit && (*limit) < 0) {
1730 yaffs_DeleteWorker(in,
1738 YAFFS_TNODES_INTERNAL_BITS)
1743 yaffs_FreeTnode(dev,
1746 tn->internal[i] = NULL;
1750 return (allDone) ? 1 : 0;
1751 } else if (level == 0) {
1754 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1756 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1759 chunkInInode = (chunkOffset <<
1760 YAFFS_TNODES_LEVEL0_BITS) + i;
1763 yaffs_FindChunkInGroup(dev,
1769 if (foundChunk > 0) {
1770 yaffs_DeleteChunk(dev,
1775 *limit = *limit - 1;
1782 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1786 return (i < 0) ? 1 : 0;
1796 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1798 yaffs_BlockInfo *theBlock;
1800 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1802 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->param.nChunksPerBlock);
1804 theBlock->softDeletions++;
1806 yaffs_UpdateOldestDirtySequence(dev,theBlock);
1810 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1811 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1813 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1816 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1817 __u32 level, int chunkOffset)
1822 yaffs_Device *dev = in->myDev;
1827 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1829 if (tn->internal[i]) {
1831 yaffs_SoftDeleteWorker(in,
1837 YAFFS_TNODES_INTERNAL_BITS)
1840 yaffs_FreeTnode(dev,
1843 tn->internal[i] = NULL;
1845 /* Hoosterman... how could this happen? */
1849 return (allDone) ? 1 : 0;
1850 } else if (level == 0) {
1852 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1853 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1855 /* Note this does not find the real chunk, only the chunk group.
1856 * We make an assumption that a chunk group is not larger than
1859 yaffs_SoftDeleteChunk(dev, theChunk);
1860 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1874 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1877 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1878 if (obj->nDataChunks <= 0) {
1879 /* Empty file with no duplicate object headers, just delete it immediately */
1880 yaffs_FreeTnode(obj->myDev,
1881 obj->variant.fileVariant.top);
1882 obj->variant.fileVariant.top = NULL;
1883 T(YAFFS_TRACE_TRACING,
1884 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1886 yaffs_DoGenericObjectDeletion(obj);
1888 yaffs_SoftDeleteWorker(obj,
1889 obj->variant.fileVariant.top,
1890 obj->variant.fileVariant.
1892 obj->softDeleted = 1;
1897 /* Pruning removes any part of the file structure tree that is beyond the
1898 * bounds of the file (ie that does not point to chunks).
1900 * A file should only get pruned when its size is reduced.
1902 * Before pruning, the chunks must be pulled from the tree and the
1903 * level 0 tnode entries must be zeroed out.
1904 * Could also use this for file deletion, but that's probably better handled
1905 * by a special case.
1907 * This function is recursive. For levels > 0 the function is called again on
1908 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1909 * If there is no data in a subtree then it is pruned.
1912 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1913 __u32 level, int del0)
1922 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1923 if (tn->internal[i]) {
1925 yaffs_PruneWorker(dev, tn->internal[i],
1927 (i == 0) ? del0 : 1);
1930 if (tn->internal[i])
1934 int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
1935 __u32 *map = (__u32 *)tn;
1937 for(i = 0; !hasData && i < tnodeSize_u32; i++){
1943 if (hasData == 0 && del0) {
1944 /* Free and return NULL */
1946 yaffs_FreeTnode(dev, tn);
1956 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1957 yaffs_FileStructure *fStruct)
1964 if (fStruct->topLevel > 0) {
1966 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1968 /* Now we have a tree with all the non-zero branches NULL but the height
1969 * is the same as it was.
1970 * Let's see if we can trim internal tnodes to shorten the tree.
1971 * We can do this if only the 0th element in the tnode is in use
1972 * (ie all the non-zero are NULL)
1975 while (fStruct->topLevel && !done) {
1979 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1980 if (tn->internal[i])
1985 fStruct->top = tn->internal[0];
1986 fStruct->topLevel--;
1987 yaffs_FreeTnode(dev, tn);
1997 /*-------------------- End of File Structure functions.-------------------*/
1999 /* yaffs_CreateFreeObjects creates a bunch more objects and
2000 * adds them to the object free list.
2002 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
2005 yaffs_Object *newObjects;
2006 yaffs_ObjectList *list;
2011 /* make these things */
2012 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
2013 list = YMALLOC(sizeof(yaffs_ObjectList));
2015 if (!newObjects || !list) {
2024 T(YAFFS_TRACE_ALLOCATE,
2025 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
2029 /* Hook them into the free list */
2030 for (i = 0; i < nObjects - 1; i++) {
2031 newObjects[i].siblings.next =
2032 (struct ylist_head *)(&newObjects[i + 1]);
2035 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
2036 dev->freeObjects = newObjects;
2037 dev->nFreeObjects += nObjects;
2038 dev->nObjectsCreated += nObjects;
2040 /* Now add this bunch of Objects to a list for freeing up. */
2042 list->objects = newObjects;
2043 list->next = dev->allocatedObjectList;
2044 dev->allocatedObjectList = list;
2050 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
2051 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
2053 yaffs_Object *tn = NULL;
2055 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2056 tn = YMALLOC(sizeof(yaffs_Object));
2058 dev->nObjectsCreated++;
2060 /* If there are none left make more */
2061 if (!dev->freeObjects)
2062 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
2064 if (dev->freeObjects) {
2065 tn = dev->freeObjects;
2067 (yaffs_Object *) (dev->freeObjects->siblings.next);
2068 dev->nFreeObjects--;
2072 /* Now sweeten it up... */
2074 memset(tn, 0, sizeof(yaffs_Object));
2075 tn->beingCreated = 1;
2079 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
2080 YINIT_LIST_HEAD(&(tn->hardLinks));
2081 YINIT_LIST_HEAD(&(tn->hashLink));
2082 YINIT_LIST_HEAD(&tn->siblings);
2085 /* Now make the directory sane */
2087 tn->parent = dev->rootDir;
2088 ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
2091 /* Add it to the lost and found directory.
2092 * NB Can't put root or lostNFound in lostNFound so
2093 * check if lostNFound exists first
2095 if (dev->lostNFoundDir)
2096 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
2098 tn->beingCreated = 0;
2101 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2106 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
2111 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
2113 obj->fake = 1; /* it is fake so it might have no NAND presence... */
2114 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
2115 obj->unlinkAllowed = 0; /* ... or unlink it */
2118 obj->yst_mode = mode;
2120 obj->hdrChunk = 0; /* Not a valid chunk. */
2127 static void yaffs_UnhashObject(yaffs_Object *tn)
2130 yaffs_Device *dev = tn->myDev;
2132 /* If it is still linked into the bucket list, free from the list */
2133 if (!ylist_empty(&tn->hashLink)) {
2134 ylist_del_init(&tn->hashLink);
2135 bucket = yaffs_HashFunction(tn->objectId);
2136 dev->objectBucket[bucket].count--;
2140 /* FreeObject frees up a Object and puts it back on the free list */
2141 static void yaffs_FreeObject(yaffs_Object *tn)
2143 yaffs_Device *dev = tn->myDev;
2145 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
2151 if (!ylist_empty(&tn->siblings))
2156 /* We're still hooked up to a cached inode.
2157 * Don't delete now, but mark for later deletion
2159 tn->deferedFree = 1;
2163 yaffs_UnhashObject(tn);
2165 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2167 dev->nObjectsCreated--;
2170 /* Link into the free list. */
2171 tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2172 dev->freeObjects = tn;
2173 dev->nFreeObjects++;
2175 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2179 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2181 if (obj->deferedFree)
2182 yaffs_FreeObject(obj);
2186 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2188 /* Free the list of allocated Objects */
2190 yaffs_ObjectList *tmp;
2192 while (dev->allocatedObjectList) {
2193 tmp = dev->allocatedObjectList->next;
2194 YFREE(dev->allocatedObjectList->objects);
2195 YFREE(dev->allocatedObjectList);
2197 dev->allocatedObjectList = tmp;
2200 dev->freeObjects = NULL;
2201 dev->nFreeObjects = 0;
2202 dev->nObjectsCreated = 0;
2205 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2209 dev->allocatedObjectList = NULL;
2210 dev->freeObjects = NULL;
2211 dev->nFreeObjects = 0;
2213 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2214 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2215 dev->objectBucket[i].count = 0;
2219 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2223 int lowest = 999999;
2226 /* Search for the shortest list or one that
2230 for (i = 0; i < 10 && lowest > 4; i++) {
2231 dev->bucketFinder++;
2232 dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
2233 if (dev->objectBucket[dev->bucketFinder].count < lowest) {
2234 lowest = dev->objectBucket[dev->bucketFinder].count;
2235 l = dev->bucketFinder;
2243 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2245 int bucket = yaffs_FindNiceObjectBucket(dev);
2247 /* Now find an object value that has not already been taken
2248 * by scanning the list.
2252 struct ylist_head *i;
2254 __u32 n = (__u32) bucket;
2256 /* yaffs_CheckObjectHashSanity(); */
2260 n += YAFFS_NOBJECT_BUCKETS;
2261 if (1 || dev->objectBucket[bucket].count > 0) {
2262 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2263 /* If there is already one in the list */
2264 if (i && ylist_entry(i, yaffs_Object,
2265 hashLink)->objectId == n) {
2275 static void yaffs_HashObject(yaffs_Object *in)
2277 int bucket = yaffs_HashFunction(in->objectId);
2278 yaffs_Device *dev = in->myDev;
2280 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2281 dev->objectBucket[bucket].count++;
2284 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2286 int bucket = yaffs_HashFunction(number);
2287 struct ylist_head *i;
2290 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2291 /* Look if it is in the list */
2293 in = ylist_entry(i, yaffs_Object, hashLink);
2294 if (in->objectId == number) {
2296 /* Don't tell the VFS about this one if it is defered free */
2297 if (in->deferedFree)
2308 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2309 yaffs_ObjectType type)
2311 yaffs_Object *theObject=NULL;
2312 yaffs_Tnode *tn = NULL;
2315 number = yaffs_CreateNewObjectNumber(dev);
2317 if (type == YAFFS_OBJECT_TYPE_FILE) {
2318 tn = yaffs_GetTnode(dev);
2323 theObject = yaffs_AllocateEmptyObject(dev);
2326 yaffs_FreeTnode(dev,tn);
2332 theObject->fake = 0;
2333 theObject->renameAllowed = 1;
2334 theObject->unlinkAllowed = 1;
2335 theObject->objectId = number;
2336 yaffs_HashObject(theObject);
2337 theObject->variantType = type;
2338 #ifdef CONFIG_YAFFS_WINCE
2339 yfsd_WinFileTimeNow(theObject->win_atime);
2340 theObject->win_ctime[0] = theObject->win_mtime[0] =
2341 theObject->win_atime[0];
2342 theObject->win_ctime[1] = theObject->win_mtime[1] =
2343 theObject->win_atime[1];
2347 theObject->yst_atime = theObject->yst_mtime =
2348 theObject->yst_ctime = Y_CURRENT_TIME;
2351 case YAFFS_OBJECT_TYPE_FILE:
2352 theObject->variant.fileVariant.fileSize = 0;
2353 theObject->variant.fileVariant.scannedFileSize = 0;
2354 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2355 theObject->variant.fileVariant.topLevel = 0;
2356 theObject->variant.fileVariant.top = tn;
2358 case YAFFS_OBJECT_TYPE_DIRECTORY:
2359 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2362 case YAFFS_OBJECT_TYPE_SYMLINK:
2363 case YAFFS_OBJECT_TYPE_HARDLINK:
2364 case YAFFS_OBJECT_TYPE_SPECIAL:
2365 /* No action required */
2367 case YAFFS_OBJECT_TYPE_UNKNOWN:
2368 /* todo this should not happen */
2376 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2378 yaffs_ObjectType type)
2380 yaffs_Object *theObject = NULL;
2383 theObject = yaffs_FindObjectByNumber(dev, number);
2386 theObject = yaffs_CreateNewObject(dev, number, type);
2393 static YCHAR *yaffs_CloneString(const YCHAR *str)
2395 YCHAR *newStr = NULL;
2401 len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
2402 newStr = YMALLOC((len + 1) * sizeof(YCHAR));
2404 yaffs_strncpy(newStr, str,len);
2412 * Mknod (create) a new object.
2413 * equivalentObject only has meaning for a hard link;
2414 * aliasString only has meaning for a symlink.
2415 * rdev only has meaning for devices (a subset of special objects)
2418 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2419 yaffs_Object *parent,
2424 yaffs_Object *equivalentObject,
2425 const YCHAR *aliasString, __u32 rdev)
2430 yaffs_Device *dev = parent->myDev;
2432 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2433 if (yaffs_FindObjectByName(parent, name))
2436 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2437 str = yaffs_CloneString(aliasString);
2442 in = yaffs_CreateNewObject(dev, -1, type);
2457 in->variantType = type;
2459 in->yst_mode = mode;
2461 #ifdef CONFIG_YAFFS_WINCE
2462 yfsd_WinFileTimeNow(in->win_atime);
2463 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2464 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2467 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2469 in->yst_rdev = rdev;
2473 in->nDataChunks = 0;
2475 yaffs_SetObjectName(in, name);
2478 yaffs_AddObjectToDirectory(parent, in);
2480 in->myDev = parent->myDev;
2483 case YAFFS_OBJECT_TYPE_SYMLINK:
2484 in->variant.symLinkVariant.alias = str;
2486 case YAFFS_OBJECT_TYPE_HARDLINK:
2487 in->variant.hardLinkVariant.equivalentObject =
2489 in->variant.hardLinkVariant.equivalentObjectId =
2490 equivalentObject->objectId;
2491 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2493 case YAFFS_OBJECT_TYPE_FILE:
2494 case YAFFS_OBJECT_TYPE_DIRECTORY:
2495 case YAFFS_OBJECT_TYPE_SPECIAL:
2496 case YAFFS_OBJECT_TYPE_UNKNOWN:
2501 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2502 /* Could not create the object header, fail the creation */
2503 yaffs_DeleteObject(in);
2507 yaffs_UpdateParent(parent);
2513 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2514 __u32 mode, __u32 uid, __u32 gid)
2516 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2517 uid, gid, NULL, NULL, 0);
2520 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2521 __u32 mode, __u32 uid, __u32 gid)
2523 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2524 mode, uid, gid, NULL, NULL, 0);
2527 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2528 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2530 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2531 uid, gid, NULL, NULL, rdev);
2534 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2535 __u32 mode, __u32 uid, __u32 gid,
2538 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2539 uid, gid, NULL, alias, 0);
2542 /* yaffs_Link returns the object id of the equivalent object.*/
2543 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2544 yaffs_Object *equivalentObject)
2546 /* Get the real object in case we were fed a hard link as an equivalent object */
2547 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2549 if (yaffs_MknodObject
2550 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2551 equivalentObject, NULL, 0)) {
2552 return equivalentObject;
2559 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2560 const YCHAR *newName, int force, int shadows)
2565 yaffs_Object *existingTarget;
2568 newDir = obj->parent; /* use the old directory */
2570 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2571 T(YAFFS_TRACE_ALWAYS,
2573 ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2578 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2579 if (obj->myDev->param.isYaffs2)
2580 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2582 unlinkOp = (newDir == obj->myDev->unlinkedDir
2583 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2585 deleteOp = (newDir == obj->myDev->deletedDir);
2587 existingTarget = yaffs_FindObjectByName(newDir, newName);
2589 /* If the object is a file going into the unlinked directory,
2590 * then it is OK to just stuff it in since duplicate names are allowed.
2591 * else only proceed if the new name does not exist and if we're putting
2592 * it into a directory.
2599 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2600 yaffs_SetObjectName(obj, newName);
2603 yaffs_AddObjectToDirectory(newDir, obj);
2608 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2609 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2616 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2617 yaffs_Object *newDir, const YCHAR *newName)
2619 yaffs_Object *obj = NULL;
2620 yaffs_Object *existingTarget = NULL;
2626 if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2628 if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2631 dev = oldDir->myDev;
2633 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2634 /* Special case for case insemsitive systems (eg. WinCE).
2635 * While look-up is case insensitive, the name isn't.
2636 * Therefore we might want to change x.txt to X.txt
2638 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2642 if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
2646 obj = yaffs_FindObjectByName(oldDir, oldName);
2648 if (obj && obj->renameAllowed) {
2650 /* Now do the handling for an existing target, if there is one */
2652 existingTarget = yaffs_FindObjectByName(newDir, newName);
2653 if (existingTarget &&
2654 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2655 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2656 /* There is a target that is a non-empty directory, so we fail */
2657 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2658 } else if (existingTarget && existingTarget != obj) {
2659 /* Nuke the target first, using shadowing,
2660 * but only if it isn't the same object.
2662 * Note we must disable gc otherwise it can mess up the shadowing.
2666 yaffs_ChangeObjectName(obj, newDir, newName, force,
2667 existingTarget->objectId);
2668 existingTarget->isShadowed = 1;
2669 yaffs_UnlinkObject(existingTarget);
2673 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2675 yaffs_UpdateParent(oldDir);
2676 if(newDir != oldDir)
2677 yaffs_UpdateParent(newDir);
2684 /*------------------------- Block Management and Page Allocation ----------------*/
2686 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2688 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2690 dev->blockInfo = NULL;
2691 dev->chunkBits = NULL;
2693 dev->allocationBlock = -1; /* force it to get a new one */
2695 /* If the first allocation strategy fails, thry the alternate one */
2696 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2697 if (!dev->blockInfo) {
2698 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2699 dev->blockInfoAlt = 1;
2701 dev->blockInfoAlt = 0;
2703 if (dev->blockInfo) {
2704 /* Set up dynamic blockinfo stuff. */
2705 dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
2706 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2707 if (!dev->chunkBits) {
2708 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2709 dev->chunkBitsAlt = 1;
2711 dev->chunkBitsAlt = 0;
2714 if (dev->blockInfo && dev->chunkBits) {
2715 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2716 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2723 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2725 if (dev->blockInfoAlt && dev->blockInfo)
2726 YFREE_ALT(dev->blockInfo);
2727 else if (dev->blockInfo)
2728 YFREE(dev->blockInfo);
2730 dev->blockInfoAlt = 0;
2732 dev->blockInfo = NULL;
2734 if (dev->chunkBitsAlt && dev->chunkBits)
2735 YFREE_ALT(dev->chunkBits);
2736 else if (dev->chunkBits)
2737 YFREE(dev->chunkBits);
2738 dev->chunkBitsAlt = 0;
2739 dev->chunkBits = NULL;
2742 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2743 yaffs_BlockInfo *bi)
2746 if (!dev->param.isYaffs2)
2747 return 1; /* disqualification only applies to yaffs2. */
2749 if (!bi->hasShrinkHeader)
2750 return 1; /* can gc */
2752 yaffs_FindOldestDirtySequence(dev);
2754 /* Can't do gc of this block if there are any blocks older than this one that have
2757 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2761 * yaffs_FindRefreshBlock()
2762 * periodically finds the oldest full block by sequence number for refreshing.
2765 static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev)
2770 __u32 oldestSequence = 0;
2772 yaffs_BlockInfo *bi;
2775 * If refresh period < 10 then refreshing is disabled.
2777 if(dev->param.refreshPeriod < 10 ||
2778 !dev->param.isYaffs2)
2782 * Fix broken values.
2784 if(dev->refreshSkip > dev->param.refreshPeriod)
2785 dev->refreshSkip = dev->param.refreshPeriod;
2787 if(dev->refreshSkip > 0){
2793 * Refresh skip is now zero.
2794 * We'll do a refresh this time around....
2795 * Update the refresh skip and find the oldest block.
2797 dev->refreshSkip = dev->param.refreshPeriod;
2798 dev->refreshCount++;
2800 for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
2802 bi = yaffs_GetBlockInfo(dev, b);
2805 if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
2808 bi->sequenceNumber < oldestSequence){
2810 oldestSequence = bi->sequenceNumber;
2817 (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
2818 dev->refreshCount, oldest, oldestSequence));
2825 * FindDiretiestBlock is used to select the dirtiest block (or close enough)
2826 * for garbage collection.
2829 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2832 int b = dev->currentDirtyChecker;
2838 int prioritised = 0;
2839 yaffs_BlockInfo *bi;
2840 int pendingPrioritisedExist = 0;
2842 /* First let's see if we need to grab a prioritised block */
2843 if (dev->hasPendingPrioritisedGCs) {
2844 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2846 bi = yaffs_GetBlockInfo(dev, i);
2847 /* yaffs_VerifyBlock(dev,bi,i); */
2849 if (bi->gcPrioritise) {
2850 pendingPrioritisedExist = 1;
2851 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2852 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2853 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2856 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2861 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2862 dev->hasPendingPrioritisedGCs = 0;
2865 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2867 * else (we're doing a leasurely gc), then we only bother to do this if the
2868 * block has only a few pages in use.
2871 dev->nonAggressiveSkip--;
2873 if (!aggressive && (dev->nonAggressiveSkip > 0))
2878 (aggressive) ? dev->param.nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2882 dev->internalEndBlock - dev->internalStartBlock + 1;
2885 dev->internalEndBlock - dev->internalStartBlock + 1;
2886 iterations = iterations / 16;
2887 if (iterations > 200)
2891 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2893 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2894 b = dev->internalStartBlock;
2896 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2897 T(YAFFS_TRACE_ERROR,
2898 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2902 bi = yaffs_GetBlockInfo(dev, b);
2904 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2905 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2906 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2908 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2912 dev->currentDirtyChecker = b;
2916 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2917 dev->param.nChunksPerBlock - pagesInUse, prioritised));
2921 dev->nonAggressiveSkip = 4;
2926 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2928 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2932 /* If the block is still healthy erase it and mark as clean.
2933 * If the block has had a data failure, then retire it.
2936 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2937 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2938 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2940 yaffs_ClearOldestDirtySequence(dev,bi);
2942 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2944 if (!bi->needsRetiring) {
2945 yaffs_InvalidateCheckpoint(dev);
2946 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2948 dev->nErasureFailures++;
2949 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2950 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2955 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2957 for (i = 0; i < dev->param.nChunksPerBlock; i++) {
2958 if (!yaffs_CheckChunkErased
2959 (dev, blockNo * dev->param.nChunksPerBlock + i)) {
2960 T(YAFFS_TRACE_ERROR,
2962 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2963 TENDSTR), blockNo, i));
2969 /* Clean it up... */
2970 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2971 bi->sequenceNumber = 0;
2972 dev->nErasedBlocks++;
2974 bi->softDeletions = 0;
2975 bi->hasShrinkHeader = 0;
2976 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2977 bi->gcPrioritise = 0;
2978 yaffs_ClearChunkBits(dev, blockNo);
2980 T(YAFFS_TRACE_ERASE,
2981 (TSTR("Erased block %d" TENDSTR), blockNo));
2983 dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
2985 yaffs_RetireBlock(dev, blockNo);
2986 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2987 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2991 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2995 yaffs_BlockInfo *bi;
2997 if (dev->nErasedBlocks < 1) {
2998 /* Hoosterman we've got a problem.
2999 * Can't get space to gc
3001 T(YAFFS_TRACE_ERROR,
3002 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
3007 /* Find an empty block. */
3009 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
3010 dev->allocationBlockFinder++;
3011 if (dev->allocationBlockFinder < dev->internalStartBlock
3012 || dev->allocationBlockFinder > dev->internalEndBlock) {
3013 dev->allocationBlockFinder = dev->internalStartBlock;
3016 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
3018 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
3019 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
3020 dev->sequenceNumber++;
3021 bi->sequenceNumber = dev->sequenceNumber;
3022 dev->nErasedBlocks--;
3023 T(YAFFS_TRACE_ALLOCATE,
3024 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
3025 dev->allocationBlockFinder, dev->sequenceNumber,
3026 dev->nErasedBlocks));
3027 return dev->allocationBlockFinder;
3031 T(YAFFS_TRACE_ALWAYS,
3033 ("yaffs tragedy: no more erased blocks, but there should have been %d"
3034 TENDSTR), dev->nErasedBlocks));
3041 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
3043 if (!dev->nCheckpointBlocksRequired &&
3044 dev->param.isYaffs2) {
3045 /* Not a valid value so recalculate */
3048 int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
3049 int tnodeSize = yaffs_CalcTnodeSize(dev);
3051 nBytes += sizeof(yaffs_CheckpointValidity);
3052 nBytes += sizeof(yaffs_CheckpointDevice);
3053 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
3054 nBytes += devBlocks * dev->chunkBitmapStride;
3055 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
3056 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
3057 nBytes += sizeof(yaffs_CheckpointValidity);
3058 nBytes += sizeof(__u32); /* checksum*/
3060 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
3062 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
3064 dev->nCheckpointBlocksRequired = nBlocks;
3067 return dev->nCheckpointBlocksRequired;
3071 * Check if there's space to allocate...
3072 * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
3074 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
3077 int reservedBlocks = dev->param.nReservedBlocks;
3078 int checkpointBlocks;
3080 if (dev->param.isYaffs2) {
3081 checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) -
3082 dev->blocksInCheckpoint;
3083 if (checkpointBlocks < 0)
3084 checkpointBlocks = 0;
3086 checkpointBlocks = 0;
3089 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
3091 return (dev->nFreeChunks > reservedChunks);
3094 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
3095 yaffs_BlockInfo **blockUsedPtr)
3098 yaffs_BlockInfo *bi;
3100 if (dev->allocationBlock < 0) {
3101 /* Get next block to allocate off */
3102 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
3103 dev->allocationPage = 0;
3106 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
3107 /* Not enough space to allocate unless we're allowed to use the reserve. */
3111 if (dev->nErasedBlocks < dev->param.nReservedBlocks
3112 && dev->allocationPage == 0) {
3113 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
3116 /* Next page please.... */
3117 if (dev->allocationBlock >= 0) {
3118 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3120 retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
3121 dev->allocationPage;
3123 yaffs_SetChunkBit(dev, dev->allocationBlock,
3124 dev->allocationPage);
3126 dev->allocationPage++;
3130 /* If the block is full set the state to full */
3131 if (dev->allocationPage >= dev->param.nChunksPerBlock) {
3132 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3133 dev->allocationBlock = -1;
3142 T(YAFFS_TRACE_ERROR,
3143 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3148 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3152 n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3154 if (dev->allocationBlock > 0)
3155 n += (dev->param.nChunksPerBlock - dev->allocationPage);
3162 * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3163 * if we don't want to write to it.
3165 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3167 if(dev->allocationBlock > 0){
3168 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3169 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3170 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3171 dev->allocationBlock = -1;
3177 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3183 int retVal = YAFFS_OK;
3186 int isCheckpointBlock;
3190 int chunksBefore = yaffs_GetErasedChunks(dev);
3193 yaffs_ExtendedTags tags;
3195 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3197 yaffs_Object *object;
3199 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3202 T(YAFFS_TRACE_TRACING,
3203 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3206 bi->hasShrinkHeader,
3209 /*yaffs_VerifyFreeChunks(dev); */
3211 if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3212 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3214 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
3216 /* Take off the number of soft deleted entries because
3217 * they're going to get really deleted during GC.
3219 if(dev->gcChunk == 0) /* first time through for this block */
3220 dev->nFreeChunks -= bi->softDeletions;
3224 if (isCheckpointBlock ||
3225 !yaffs_StillSomeChunkBits(dev, block)) {
3226 T(YAFFS_TRACE_TRACING,
3228 ("Collecting block %d that has no chunks in use" TENDSTR),
3230 yaffs_BlockBecameDirty(dev, block);
3233 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3235 yaffs_VerifyBlock(dev, bi, block);
3237 maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 10;
3238 oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
3240 for (/* init already done */;
3241 retVal == YAFFS_OK &&
3242 dev->gcChunk < dev->param.nChunksPerBlock &&
3243 (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3245 dev->gcChunk++, oldChunk++) {
3246 if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3248 /* This page is in use and might need to be copied off */
3254 yaffs_InitialiseTags(&tags);
3256 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3260 yaffs_FindObjectByNumber(dev,
3263 T(YAFFS_TRACE_GC_DETAIL,
3265 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3266 dev->gcChunk, tags.objectId, tags.chunkId,
3269 if (object && !yaffs_SkipVerification(dev)) {
3270 if (tags.chunkId == 0)
3271 matchingChunk = object->hdrChunk;
3272 else if (object->softDeleted)
3273 matchingChunk = oldChunk; /* Defeat the test */
3275 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3277 if (oldChunk != matchingChunk)
3278 T(YAFFS_TRACE_ERROR,
3279 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3280 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3285 T(YAFFS_TRACE_ERROR,
3287 ("page %d in gc has no object: %d %d %d "
3289 tags.objectId, tags.chunkId, tags.byteCount));
3294 object->softDeleted &&
3295 tags.chunkId != 0) {
3296 /* Data chunk in a soft deleted file, throw it away
3297 * It's a soft deleted data chunk,
3298 * No need to copy this, just forget about it and
3299 * fix up the object.
3302 object->nDataChunks--;
3304 if (object->nDataChunks <= 0) {
3305 /* remeber to clean up the object */
3306 dev->gcCleanupList[cleanups] =
3312 /* Todo object && object->deleted && object->nDataChunks == 0 */
3313 /* Deleted object header with no data chunks.
3314 * Can be discarded and the file deleted.
3316 object->hdrChunk = 0;
3317 yaffs_FreeTnode(object->myDev,
3320 object->variant.fileVariant.top = NULL;
3321 yaffs_DoGenericObjectDeletion(object);
3323 } else if (object) {
3324 /* It's either a data chunk in a live file or
3325 * an ObjectHeader, so we're interested in it.
3326 * NB Need to keep the ObjectHeaders of deleted files
3327 * until the whole file has been deleted off
3329 tags.serialNumber++;
3333 if (tags.chunkId == 0) {
3334 /* It is an object Id,
3335 * We need to nuke the shrinkheader flags first
3336 * Also need to clean up shadowing.
3337 * We no longer want the shrinkHeader flag since its work is done
3338 * and if it is left in place it will mess up scanning.
3341 yaffs_ObjectHeader *oh;
3342 oh = (yaffs_ObjectHeader *)buffer;
3344 tags.extraIsShrinkHeader = 0;
3345 oh->shadowsObject = 0;
3346 oh->inbandShadowsObject = 0;
3347 if(object->variantType == YAFFS_OBJECT_TYPE_FILE)
3348 oh->fileSize = object->variant.fileVariant.fileSize;
3349 tags.extraShadows = 0;
3351 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3353 yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
3356 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3359 retVal = YAFFS_FAIL;
3362 /* Ok, now fix up the Tnodes etc. */
3364 if (tags.chunkId == 0) {
3366 object->hdrChunk = newChunk;
3367 object->serial = tags.serialNumber;
3369 /* It's a data chunk */
3371 ok = yaffs_PutChunkIntoFile
3379 if (retVal == YAFFS_OK)
3380 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3385 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3388 /* Do any required cleanups */
3389 for (i = 0; i < cleanups; i++) {
3390 /* Time to delete the file too */
3392 yaffs_FindObjectByNumber(dev,
3393 dev->gcCleanupList[i]);
3395 yaffs_FreeTnode(dev,
3396 object->variant.fileVariant.
3398 object->variant.fileVariant.top = NULL;
3401 ("yaffs: About to finally delete object %d"
3402 TENDSTR), object->objectId));
3403 yaffs_DoGenericObjectDeletion(object);
3404 object->myDev->nDeletedFiles--;
3411 yaffs_VerifyCollectedBlock(dev, bi, block);
3415 /* If the gc completed then clear the current gcBlock so that we find another. */
3416 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3417 chunksAfter = yaffs_GetErasedChunks(dev);
3418 if (chunksBefore >= chunksAfter) {
3421 ("gc did not increase free chunks before %d after %d"
3422 TENDSTR), chunksBefore, chunksAfter));
3433 /* New garbage collector
3434 * If we're very low on erased blocks then we do aggressive garbage collection
3435 * otherwise we do "leasurely" garbage collection.
3436 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3437 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3439 * The idea is to help clear out space in a more spread-out manner.
3440 * Dunno if it really does anything useful.
3442 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3446 int gcOk = YAFFS_OK;
3449 int checkpointBlockAdjust;
3451 if (dev->isDoingGC) {
3452 /* Bail out so we don't get recursive gc */
3456 /* This loop should pass the first time.
3457 * We'll only see looping here if the erase of the collected block fails.
3463 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3464 if (checkpointBlockAdjust < 0)
3465 checkpointBlockAdjust = 0;
3467 /* If we need a block soon then do aggressive gc.*/
3468 if (dev->nErasedBlocks < (dev->param.nReservedBlocks + checkpointBlockAdjust + 2))
3473 /* If we don't already have a block being gc'd then see if we should start another */
3475 if (dev->gcBlock < 1 && !aggressive) {
3476 dev->gcBlock = yaffs_FindRefreshBlock(dev);
3479 if (dev->gcBlock < 1) {
3480 dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3484 block = dev->gcBlock;
3487 dev->garbageCollections++;
3489 dev->passiveGarbageCollections++;
3493 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3494 dev->nErasedBlocks, aggressive));
3496 gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3499 if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && block > 0) {
3502 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3503 TENDSTR), dev->nErasedBlocks, maxTries, block));
3505 } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
3509 return aggressive ? gcOk : YAFFS_OK;
3512 /*------------------------- TAGS --------------------------------*/
3514 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3517 return (tags->chunkId == chunkInObject &&
3518 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3523 /*-------------------- Data file manipulation -----------------*/
3525 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3526 yaffs_ExtendedTags *tags)
3528 /*Get the Tnode, then get the level 0 offset chunk offset */
3531 yaffs_ExtendedTags localTags;
3534 yaffs_Device *dev = in->myDev;
3537 /* Passed a NULL, so use our own tags space */
3541 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3544 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3547 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3553 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3554 yaffs_ExtendedTags *tags)
3556 /* Get the Tnode, then get the level 0 offset chunk offset */
3559 yaffs_ExtendedTags localTags;
3561 yaffs_Device *dev = in->myDev;
3565 /* Passed a NULL, so use our own tags space */
3569 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3573 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3576 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3579 /* Delete the entry in the filestructure (if found) */
3581 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3587 #ifdef YAFFS_PARANOID
3589 static int yaffs_CheckFileSanity(yaffs_Object *in)
3597 yaffs_Tags localTags;
3598 yaffs_Tags *tags = &localTags;
3602 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3605 objId = in->objectId;
3606 fSize = in->variant.fileVariant.fileSize;
3608 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3610 for (chunk = 1; chunk <= nChunks; chunk++) {
3611 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3616 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3618 if (yaffs_CheckChunkBits
3619 (dev, theChunk / dev->param.nChunksPerBlock,
3620 theChunk % dev->param.nChunksPerBlock)) {
3622 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3626 (tags, in->objectId, chunk, chunkDeleted)) {
3636 /* T(("No level 0 found for %d\n", chunk)); */
3640 return failed ? YAFFS_FAIL : YAFFS_OK;
3645 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3646 int chunkInNAND, int inScan)
3648 /* NB inScan is zero unless scanning.
3649 * For forward scanning, inScan is > 0;
3650 * for backward scanning inScan is < 0
3652 * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3656 yaffs_Device *dev = in->myDev;
3658 yaffs_ExtendedTags existingTags;
3659 yaffs_ExtendedTags newTags;
3660 unsigned existingSerial, newSerial;
3662 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3663 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3664 * If it is not during Scanning then something went wrong!
3667 T(YAFFS_TRACE_ERROR,
3669 ("yaffs tragedy:attempt to put data chunk into a non-file"
3674 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3678 tn = yaffs_AddOrFindLevel0Tnode(dev,
3679 &in->variant.fileVariant,
3686 /* Dummy insert, bail now */
3689 existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3692 /* If we're scanning then we need to test for duplicates
3693 * NB This does not need to be efficient since it should only ever
3694 * happen when the power fails during a write, then only one
3695 * chunk should ever be affected.
3697 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3698 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3701 if (existingChunk > 0) {
3702 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3703 * thus we have to do a FindChunkInFile to get the real chunk id.
3705 * We have a duplicate now we need to decide which one to use:
3707 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3708 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3709 * YAFFS1: Get both sets of tags and compare serial numbers.
3713 /* Only do this for forward scanning */
3714 yaffs_ReadChunkWithTagsFromNAND(dev,
3718 /* Do a proper find */
3720 yaffs_FindChunkInFile(in, chunkInInode,
3724 if (existingChunk <= 0) {
3725 /*Hoosterman - how did this happen? */
3727 T(YAFFS_TRACE_ERROR,
3729 ("yaffs tragedy: existing chunk < 0 in scan"
3734 /* NB The deleted flags should be false, otherwise the chunks will
3735 * not be loaded during a scan
3739 newSerial = newTags.serialNumber;
3740 existingSerial = existingTags.serialNumber;
3744 (in->myDev->param.isYaffs2 ||
3745 existingChunk <= 0 ||
3746 ((existingSerial + 1) & 3) == newSerial)) {
3747 /* Forward scanning.
3749 * Delete the old one and drop through to update the tnode
3751 yaffs_DeleteChunk(dev, existingChunk, 1,
3754 /* Backward scanning or we want to use the existing one
3756 * Delete the new one and return early so that the tnode isn't changed
3758 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3766 if (existingChunk == 0)
3769 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3774 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3777 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3779 if (chunkInNAND >= 0)
3780 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3783 T(YAFFS_TRACE_NANDACCESS,
3784 (TSTR("Chunk %d not found zero instead" TENDSTR),
3786 /* get sane (zero) data if you read a hole */
3787 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3793 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3797 yaffs_ExtendedTags tags;
3798 yaffs_BlockInfo *bi;
3804 block = chunkId / dev->param.nChunksPerBlock;
3805 page = chunkId % dev->param.nChunksPerBlock;
3808 if (!yaffs_CheckChunkBit(dev, block, page))
3809 T(YAFFS_TRACE_VERIFY,
3810 (TSTR("Deleting invalid chunk %d"TENDSTR),
3813 bi = yaffs_GetBlockInfo(dev, block);
3815 yaffs_UpdateOldestDirtySequence(dev,bi);
3817 T(YAFFS_TRACE_DELETION,
3818 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3821 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
3823 yaffs_InitialiseTags(&tags);
3825 tags.chunkDeleted = 1;
3827 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3828 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3830 dev->nUnmarkedDeletions++;
3833 /* Pull out of the management area.
3834 * If the whole block became dirty, this will kick off an erasure.
3836 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3837 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3838 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3839 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3842 yaffs_ClearChunkBit(dev, block, page);
3846 if (bi->pagesInUse == 0 &&
3847 !bi->hasShrinkHeader &&
3848 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3849 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3850 yaffs_BlockBecameDirty(dev, block);
3857 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3858 const __u8 *buffer, int nBytes,
3861 /* Find old chunk Need to do this to get serial number
3862 * Write new one and patch into tree.
3863 * Invalidate old tags.
3867 yaffs_ExtendedTags prevTags;
3870 yaffs_ExtendedTags newTags;
3872 yaffs_Device *dev = in->myDev;
3874 yaffs_CheckGarbageCollection(dev);
3876 /* Get the previous chunk at this location in the file if it exists.
3877 * If it does not exist then put a zero into the tree. This creates
3878 * the tnode now, rather than later when it is harder to clean up.
3880 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3881 if(prevChunkId < 1 &&
3882 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
3885 /* Set up new tags */
3886 yaffs_InitialiseTags(&newTags);
3888 newTags.chunkId = chunkInInode;
3889 newTags.objectId = in->objectId;
3890 newTags.serialNumber =
3891 (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3892 newTags.byteCount = nBytes;
3894 if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
3895 T(YAFFS_TRACE_ERROR,
3896 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3902 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3905 if (newChunkId > 0) {
3906 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3908 if (prevChunkId > 0)
3909 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3911 yaffs_CheckFileSanity(in);
3917 /* UpdateObjectHeader updates the header on NAND for an object.
3918 * If name is not NULL, then that new name is used.
3920 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3921 int isShrink, int shadows)
3924 yaffs_BlockInfo *bi;
3926 yaffs_Device *dev = in->myDev;
3933 yaffs_ExtendedTags newTags;
3934 yaffs_ExtendedTags oldTags;
3935 YCHAR *alias = NULL;
3937 __u8 *buffer = NULL;
3938 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3940 yaffs_ObjectHeader *oh = NULL;
3942 yaffs_strcpy(oldName, _Y("silly old name"));
3946 in == dev->rootDir || /* The rootDir should also be saved */
3949 yaffs_CheckGarbageCollection(dev);
3950 yaffs_CheckObjectDetailsLoaded(in);
3952 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3953 oh = (yaffs_ObjectHeader *) buffer;
3955 prevChunkId = in->hdrChunk;
3957 if (prevChunkId > 0) {
3958 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3961 yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3963 memcpy(oldName, oh->name, sizeof(oh->name));
3966 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3968 oh->type = in->variantType;
3969 oh->yst_mode = in->yst_mode;
3970 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3972 #ifdef CONFIG_YAFFS_WINCE
3973 oh->win_atime[0] = in->win_atime[0];
3974 oh->win_ctime[0] = in->win_ctime[0];
3975 oh->win_mtime[0] = in->win_mtime[0];
3976 oh->win_atime[1] = in->win_atime[1];
3977 oh->win_ctime[1] = in->win_ctime[1];
3978 oh->win_mtime[1] = in->win_mtime[1];
3980 oh->yst_uid = in->yst_uid;
3981 oh->yst_gid = in->yst_gid;
3982 oh->yst_atime = in->yst_atime;
3983 oh->yst_mtime = in->yst_mtime;
3984 oh->yst_ctime = in->yst_ctime;
3985 oh->yst_rdev = in->yst_rdev;
3988 oh->parentObjectId = in->parent->objectId;
3990 oh->parentObjectId = 0;
3992 if (name && *name) {
3993 memset(oh->name, 0, sizeof(oh->name));
3994 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3995 } else if (prevChunkId > 0)
3996 memcpy(oh->name, oldName, sizeof(oh->name));
3998 memset(oh->name, 0, sizeof(oh->name));
4000 oh->isShrink = isShrink;
4002 switch (in->variantType) {
4003 case YAFFS_OBJECT_TYPE_UNKNOWN:
4004 /* Should not happen */
4006 case YAFFS_OBJECT_TYPE_FILE:
4008 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
4009 || oh->parentObjectId ==
4010 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
4011 fileVariant.fileSize;
4013 case YAFFS_OBJECT_TYPE_HARDLINK:
4014 oh->equivalentObjectId =
4015 in->variant.hardLinkVariant.equivalentObjectId;
4017 case YAFFS_OBJECT_TYPE_SPECIAL:
4020 case YAFFS_OBJECT_TYPE_DIRECTORY:
4023 case YAFFS_OBJECT_TYPE_SYMLINK:
4024 alias = in->variant.symLinkVariant.alias;
4026 alias = _Y("no alias");
4027 yaffs_strncpy(oh->alias,
4029 YAFFS_MAX_ALIAS_LENGTH);
4030 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
4035 yaffs_InitialiseTags(&newTags);
4037 newTags.chunkId = 0;
4038 newTags.objectId = in->objectId;
4039 newTags.serialNumber = in->serial;
4041 /* Add extra info for file header */
4043 newTags.extraHeaderInfoAvailable = 1;
4044 newTags.extraParentObjectId = oh->parentObjectId;
4045 newTags.extraFileLength = oh->fileSize;
4046 newTags.extraIsShrinkHeader = oh->isShrink;
4047 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
4048 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
4049 newTags.extraObjectType = in->variantType;
4051 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
4053 /* Create new chunk in NAND */
4055 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
4056 (prevChunkId > 0) ? 1 : 0);
4058 if (newChunkId >= 0) {
4060 in->hdrChunk = newChunkId;
4062 if (prevChunkId > 0) {
4063 yaffs_DeleteChunk(dev, prevChunkId, 1,
4067 if (!yaffs_ObjectHasCachedWriteData(in))
4070 /* If this was a shrink, then mark the block that the chunk lives on */
4072 bi = yaffs_GetBlockInfo(in->myDev,
4073 newChunkId / in->myDev->param.nChunksPerBlock);
4074 bi->hasShrinkHeader = 1;
4079 retVal = newChunkId;
4084 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
4089 /*------------------------ Short Operations Cache ----------------------------------------
4090 * In many situations where there is no high level buffering (eg WinCE) a lot of
4091 * reads might be short sequential reads, and a lot of writes may be short
4092 * sequential writes. eg. scanning/writing a jpeg file.
4093 * In these cases, a short read/write cache can provide a huge perfomance benefit
4094 * with dumb-as-a-rock code.
4095 * In Linux, the page cache provides read buffering aand the short op cache provides write
4098 * There are a limited number (~10) of cache chunks per device so that we don't
4099 * need a very intelligent search.
4102 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
4104 yaffs_Device *dev = obj->myDev;
4106 yaffs_ChunkCache *cache;
4107 int nCaches = obj->myDev->param.nShortOpCaches;
4109 for (i = 0; i < nCaches; i++) {
4110 cache = &dev->srCache[i];
4111 if (cache->object == obj &&
4120 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
4122 yaffs_Device *dev = obj->myDev;
4123 int lowest = -99; /* Stop compiler whining. */
4125 yaffs_ChunkCache *cache;
4126 int chunkWritten = 0;
4127 int nCaches = obj->myDev->param.nShortOpCaches;
4133 /* Find the dirty cache for this object with the lowest chunk id. */
4134 for (i = 0; i < nCaches; i++) {
4135 if (dev->srCache[i].object == obj &&
4136 dev->srCache[i].dirty) {
4138 || dev->srCache[i].chunkId <
4140 cache = &dev->srCache[i];
4141 lowest = cache->chunkId;
4146 if (cache && !cache->locked) {
4147 /* Write it out and free it up */
4150 yaffs_WriteChunkDataToObject(cache->object,
4156 cache->object = NULL;
4159 } while (cache && chunkWritten > 0);
4162 /* Hoosterman, disk full while writing cache out. */
4163 T(YAFFS_TRACE_ERROR,
4164 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4171 /*yaffs_FlushEntireDeviceCache(dev)
4176 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4179 int nCaches = dev->param.nShortOpCaches;
4182 /* Find a dirty object in the cache and flush it...
4183 * until there are no further dirty objects.
4187 for (i = 0; i < nCaches && !obj; i++) {
4188 if (dev->srCache[i].object &&
4189 dev->srCache[i].dirty)
4190 obj = dev->srCache[i].object;
4194 yaffs_FlushFilesChunkCache(obj);
4201 /* Grab us a cache chunk for use.
4202 * First look for an empty one.
4203 * Then look for the least recently used non-dirty one.
4204 * Then look for the least recently used dirty one...., flush and look again.
4206 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4210 if (dev->param.nShortOpCaches > 0) {
4211 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4212 if (!dev->srCache[i].object)
4213 return &dev->srCache[i];
4220 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4222 yaffs_ChunkCache *cache;
4223 yaffs_Object *theObj;
4228 if (dev->param.nShortOpCaches > 0) {
4229 /* Try find a non-dirty one... */
4231 cache = yaffs_GrabChunkCacheWorker(dev);
4234 /* They were all dirty, find the last recently used object and flush
4235 * its cache, then find again.
4236 * NB what's here is not very accurate, we actually flush the object
4237 * the last recently used page.
4240 /* With locking we can't assume we can use entry zero */
4247 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4248 if (dev->srCache[i].object &&
4249 !dev->srCache[i].locked &&
4250 (dev->srCache[i].lastUse < usage || !cache)) {
4251 usage = dev->srCache[i].lastUse;
4252 theObj = dev->srCache[i].object;
4253 cache = &dev->srCache[i];
4258 if (!cache || cache->dirty) {
4259 /* Flush and try again */
4260 yaffs_FlushFilesChunkCache(theObj);
4261 cache = yaffs_GrabChunkCacheWorker(dev);
4271 /* Find a cached chunk */
4272 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4275 yaffs_Device *dev = obj->myDev;
4277 if (dev->param.nShortOpCaches > 0) {
4278 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4279 if (dev->srCache[i].object == obj &&
4280 dev->srCache[i].chunkId == chunkId) {
4283 return &dev->srCache[i];
4290 /* Mark the chunk for the least recently used algorithym */
4291 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4295 if (dev->param.nShortOpCaches > 0) {
4296 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4297 /* Reset the cache usages */
4299 for (i = 1; i < dev->param.nShortOpCaches; i++)
4300 dev->srCache[i].lastUse = 0;
4307 cache->lastUse = dev->srLastUse;
4314 /* Invalidate a single cache page.
4315 * Do this when a whole page gets written,
4316 * ie the short cache for this page is no longer valid.
4318 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4320 if (object->myDev->param.nShortOpCaches > 0) {
4321 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4324 cache->object = NULL;
4328 /* Invalidate all the cache pages associated with this object
4329 * Do this whenever ther file is deleted or resized.
4331 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4334 yaffs_Device *dev = in->myDev;
4336 if (dev->param.nShortOpCaches > 0) {
4337 /* Invalidate it. */
4338 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4339 if (dev->srCache[i].object == in)
4340 dev->srCache[i].object = NULL;
4345 /*--------------------- Checkpointing --------------------*/
4348 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4350 yaffs_CheckpointValidity cp;
4352 memset(&cp, 0, sizeof(cp));
4354 cp.structType = sizeof(cp);
4355 cp.magic = YAFFS_MAGIC;
4356 cp.version = YAFFS_CHECKPOINT_VERSION;
4357 cp.head = (head) ? 1 : 0;
4359 return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4363 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4365 yaffs_CheckpointValidity cp;
4368 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4371 ok = (cp.structType == sizeof(cp)) &&
4372 (cp.magic == YAFFS_MAGIC) &&
4373 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4374 (cp.head == ((head) ? 1 : 0));
4378 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4381 cp->nErasedBlocks = dev->nErasedBlocks;
4382 cp->allocationBlock = dev->allocationBlock;
4383 cp->allocationPage = dev->allocationPage;
4384 cp->nFreeChunks = dev->nFreeChunks;
4386 cp->nDeletedFiles = dev->nDeletedFiles;
4387 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4388 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4389 cp->sequenceNumber = dev->sequenceNumber;
4393 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4394 yaffs_CheckpointDevice *cp)
4396 dev->nErasedBlocks = cp->nErasedBlocks;
4397 dev->allocationBlock = cp->allocationBlock;
4398 dev->allocationPage = cp->allocationPage;
4399 dev->nFreeChunks = cp->nFreeChunks;
4401 dev->nDeletedFiles = cp->nDeletedFiles;
4402 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4403 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4404 dev->sequenceNumber = cp->sequenceNumber;
4408 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4410 yaffs_CheckpointDevice cp;
4412 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4416 /* Write device runtime values*/
4417 yaffs_DeviceToCheckpointDevice(&cp, dev);
4418 cp.structType = sizeof(cp);
4420 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4422 /* Write block info */
4424 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4425 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4428 /* Write chunk bits */
4430 nBytes = nBlocks * dev->chunkBitmapStride;
4431 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4437 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4439 yaffs_CheckpointDevice cp;
4441 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4445 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4449 if (cp.structType != sizeof(cp))
4453 yaffs_CheckpointDeviceToDevice(dev, &cp);
4455 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4457 ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4461 nBytes = nBlocks * dev->chunkBitmapStride;
4463 ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4468 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4472 cp->objectId = obj->objectId;
4473 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4474 cp->hdrChunk = obj->hdrChunk;
4475 cp->variantType = obj->variantType;
4476 cp->deleted = obj->deleted;
4477 cp->softDeleted = obj->softDeleted;
4478 cp->unlinked = obj->unlinked;
4479 cp->fake = obj->fake;
4480 cp->renameAllowed = obj->renameAllowed;
4481 cp->unlinkAllowed = obj->unlinkAllowed;
4482 cp->serial = obj->serial;
4483 cp->nDataChunks = obj->nDataChunks;
4485 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4486 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4487 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4488 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4491 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4494 yaffs_Object *parent;
4496 if (obj->variantType != cp->variantType) {
4497 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4498 TCONT("chunk %d does not match existing object type %d")
4499 TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4504 obj->objectId = cp->objectId;
4507 parent = yaffs_FindOrCreateObjectByNumber(
4510 YAFFS_OBJECT_TYPE_DIRECTORY);
4515 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4516 T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4517 TCONT(" chunk %d Parent type, %d, not directory")
4519 cp->objectId, cp->parentId, cp->variantType,
4520 cp->hdrChunk, parent->variantType));
4523 yaffs_AddObjectToDirectory(parent, obj);
4526 obj->hdrChunk = cp->hdrChunk;
4527 obj->variantType = cp->variantType;
4528 obj->deleted = cp->deleted;
4529 obj->softDeleted = cp->softDeleted;
4530 obj->unlinked = cp->unlinked;
4531 obj->fake = cp->fake;
4532 obj->renameAllowed = cp->renameAllowed;
4533 obj->unlinkAllowed = cp->unlinkAllowed;
4534 obj->serial = cp->serial;
4535 obj->nDataChunks = cp->nDataChunks;
4537 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4538 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4539 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4540 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4542 if (obj->hdrChunk > 0)
4543 obj->lazyLoaded = 1;
4549 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4550 __u32 level, int chunkOffset)
4553 yaffs_Device *dev = in->myDev;
4555 int tnodeSize = yaffs_CalcTnodeSize(dev);
4560 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4561 if (tn->internal[i]) {
4562 ok = yaffs_CheckpointTnodeWorker(in,
4565 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4568 } else if (level == 0) {
4569 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4570 ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4572 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4580 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4582 __u32 endMarker = ~0;
4585 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4586 ok = yaffs_CheckpointTnodeWorker(obj,
4587 obj->variant.fileVariant.top,
4588 obj->variant.fileVariant.topLevel,
4591 ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4598 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4602 yaffs_Device *dev = obj->myDev;
4603 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4606 int tnodeSize = yaffs_CalcTnodeSize(dev);
4608 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4610 while (ok && (~baseChunk)) {
4612 /* Read level 0 tnode */
4615 tn = yaffs_GetTnodeRaw(dev);
4617 ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4622 ok = yaffs_AddOrFindLevel0Tnode(dev,
4628 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4632 T(YAFFS_TRACE_CHECKPOINT, (
4633 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4634 nread, baseChunk, ok));
4640 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4643 yaffs_CheckpointObject cp;
4646 struct ylist_head *lh;
4649 /* Iterate through the objects in each hash entry,
4650 * dumping them to the checkpointing stream.
4653 for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
4654 ylist_for_each(lh, &dev->objectBucket[i].list) {
4656 obj = ylist_entry(lh, yaffs_Object, hashLink);
4657 if (!obj->deferedFree) {
4658 yaffs_ObjectToCheckpointObject(&cp, obj);
4659 cp.structType = sizeof(cp);
4661 T(YAFFS_TRACE_CHECKPOINT, (
4662 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4663 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4665 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4667 if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4668 ok = yaffs_WriteCheckpointTnodes(obj);
4674 /* Dump end of list */
4675 memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4676 cp.structType = sizeof(cp);
4679 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4684 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4687 yaffs_CheckpointObject cp;
4690 yaffs_Object *hardList = NULL;
4692 while (ok && !done) {
4693 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4694 if (cp.structType != sizeof(cp)) {
4695 T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4696 cp.structType, (int)sizeof(cp), ok));
4700 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4701 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4703 if (ok && cp.objectId == ~0)
4706 obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4708 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4711 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4712 ok = yaffs_ReadCheckpointTnodes(obj);
4713 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4714 obj->hardLinks.next =
4715 (struct ylist_head *) hardList;
4724 yaffs_HardlinkFixup(dev, hardList);
4729 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4731 __u32 checkpointSum;
4734 yaffs_GetCheckpointSum(dev, &checkpointSum);
4736 ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4744 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4746 __u32 checkpointSum0;
4747 __u32 checkpointSum1;
4750 yaffs_GetCheckpointSum(dev, &checkpointSum0);
4752 ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4757 if (checkpointSum0 != checkpointSum1)
4764 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4768 if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
4769 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4774 ok = yaffs_CheckpointOpen(dev, 1);
4777 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4778 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4781 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4782 ok = yaffs_WriteCheckpointDevice(dev);
4785 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4786 ok = yaffs_WriteCheckpointObjects(dev);
4789 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4790 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4794 ok = yaffs_WriteCheckpointSum(dev);
4796 if (!yaffs_CheckpointClose(dev))
4800 dev->isCheckpointed = 1;
4802 dev->isCheckpointed = 0;
4804 return dev->isCheckpointed;
4807 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4811 if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) {
4812 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4817 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4820 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4821 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4824 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4825 ok = yaffs_ReadCheckpointDevice(dev);
4828 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4829 ok = yaffs_ReadCheckpointObjects(dev);
4832 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4833 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4837 ok = yaffs_ReadCheckpointSum(dev);
4838 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4841 if (!yaffs_CheckpointClose(dev))
4845 dev->isCheckpointed = 1;
4847 dev->isCheckpointed = 0;
4853 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4855 if (dev->isCheckpointed ||
4856 dev->blocksInCheckpoint > 0) {
4857 dev->isCheckpointed = 0;
4858 yaffs_CheckpointInvalidateStream(dev);
4859 if (dev->param.markSuperBlockDirty)
4860 dev->param.markSuperBlockDirty(dev);
4865 int yaffs_CheckpointSave(yaffs_Device *dev)
4868 T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4870 yaffs_VerifyObjects(dev);
4871 yaffs_VerifyBlocks(dev);
4872 yaffs_VerifyFreeChunks(dev);
4874 if (!dev->isCheckpointed) {
4875 yaffs_InvalidateCheckpoint(dev);
4876 yaffs_WriteCheckpointData(dev);
4879 T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4881 return dev->isCheckpointed;
4884 int yaffs_CheckpointRestore(yaffs_Device *dev)
4887 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4889 retval = yaffs_ReadCheckpointData(dev);
4891 if (dev->isCheckpointed) {
4892 yaffs_VerifyObjects(dev);
4893 yaffs_VerifyBlocks(dev);
4894 yaffs_VerifyFreeChunks(dev);
4897 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4902 /*--------------------- File read/write ------------------------
4903 * Read and write have very similar structures.
4904 * In general the read/write has three parts to it
4905 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4906 * Some complete chunks
4907 * An incomplete chunk to end off with
4909 * Curve-balls: the first chunk might also be the last chunk.
4912 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4921 yaffs_ChunkCache *cache;
4928 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4929 /* start = offset % dev->nDataBytesPerChunk; */
4930 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4933 /* OK now check for the curveball where the start and end are in
4936 if ((start + n) < dev->nDataBytesPerChunk)
4939 nToCopy = dev->nDataBytesPerChunk - start;
4941 cache = yaffs_FindChunkCache(in, chunk);
4943 /* If the chunk is already in the cache or it is less than a whole chunk
4944 * or we're using inband tags then use the cache (if there is caching)
4945 * else bypass the cache.
4947 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
4948 if (dev->param.nShortOpCaches > 0) {
4950 /* If we can't find the data in the cache, then load it up. */
4953 cache = yaffs_GrabChunkCache(in->myDev);
4955 cache->chunkId = chunk;
4958 yaffs_ReadChunkDataFromObject(in, chunk,
4964 yaffs_UseChunkCache(dev, cache, 0);
4969 memcpy(buffer, &cache->data[start], nToCopy);
4973 /* Read into the local buffer then copy..*/
4976 yaffs_GetTempBuffer(dev, __LINE__);
4977 yaffs_ReadChunkDataFromObject(in, chunk,
4980 memcpy(buffer, &localBuffer[start], nToCopy);
4983 yaffs_ReleaseTempBuffer(dev, localBuffer,
4989 /* A full chunk. Read directly into the supplied buffer. */
4990 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
5004 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5005 int nBytes, int writeThrough)
5014 int startOfWrite = offset;
5015 int chunkWritten = 0;
5023 while (n > 0 && chunkWritten >= 0) {
5024 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
5025 /* start = offset % dev->nDataBytesPerChunk; */
5026 yaffs_AddrToChunk(dev, offset, &chunk, &start);
5028 if (chunk * dev->nDataBytesPerChunk + start != offset ||
5029 start >= dev->nDataBytesPerChunk) {
5030 T(YAFFS_TRACE_ERROR, (
5031 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
5033 (int)offset, chunk, start));
5037 /* OK now check for the curveball where the start and end are in
5041 if ((start + n) < dev->nDataBytesPerChunk) {
5044 /* Now folks, to calculate how many bytes to write back....
5045 * If we're overwriting and not writing to then end of file then
5046 * we need to write back as much as was there before.
5049 chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
5051 if (chunkStart > in->variant.fileVariant.fileSize)
5052 nBytesRead = 0; /* Past end of file */
5054 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
5056 if (nBytesRead > dev->nDataBytesPerChunk)
5057 nBytesRead = dev->nDataBytesPerChunk;
5061 (start + n)) ? nBytesRead : (start + n);
5063 if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
5067 nToCopy = dev->nDataBytesPerChunk - start;
5068 nToWriteBack = dev->nDataBytesPerChunk;
5071 if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5072 /* An incomplete start or end chunk (or maybe both start and end chunk),
5073 * or we're using inband tags, so we want to use the cache buffers.
5075 if (dev->param.nShortOpCaches > 0) {
5076 yaffs_ChunkCache *cache;
5077 /* If we can't find the data in the cache, then load the cache */
5078 cache = yaffs_FindChunkCache(in, chunk);
5081 && yaffs_CheckSpaceForAllocation(in->
5083 cache = yaffs_GrabChunkCache(in->myDev);
5085 cache->chunkId = chunk;
5088 yaffs_ReadChunkDataFromObject(in, chunk,
5093 !yaffs_CheckSpaceForAllocation(in->myDev)) {
5094 /* Drop the cache if it was a read cache item and
5095 * no space check has been made for it.
5101 yaffs_UseChunkCache(dev, cache, 1);
5105 memcpy(&cache->data[start], buffer,
5110 cache->nBytes = nToWriteBack;
5114 yaffs_WriteChunkDataToObject
5117 cache->data, cache->nBytes,
5123 chunkWritten = -1; /* fail the write */
5126 /* An incomplete start or end chunk (or maybe both start and end chunk)
5127 * Read into the local buffer then copy, then copy over and write back.
5131 yaffs_GetTempBuffer(dev, __LINE__);
5133 yaffs_ReadChunkDataFromObject(in, chunk,
5138 memcpy(&localBuffer[start], buffer, nToCopy);
5141 yaffs_WriteChunkDataToObject(in, chunk,
5146 yaffs_ReleaseTempBuffer(dev, localBuffer,
5152 /* A full chunk. Write directly from the supplied buffer. */
5157 yaffs_WriteChunkDataToObject(in, chunk, buffer,
5158 dev->nDataBytesPerChunk,
5161 /* Since we've overwritten the cached data, we better invalidate it. */
5162 yaffs_InvalidateChunkCache(in, chunk);
5165 if (chunkWritten >= 0) {
5174 /* Update file object */
5176 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5177 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5185 /* ---------------------- File resizing stuff ------------------ */
5187 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5190 yaffs_Device *dev = in->myDev;
5191 int oldFileSize = in->variant.fileVariant.fileSize;
5193 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5195 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5196 dev->nDataBytesPerChunk;
5200 /* Delete backwards so that we don't end up with holes if
5201 * power is lost part-way through the operation.
5203 for (i = lastDel; i >= startDel; i--) {
5204 /* NB this could be optimised somewhat,
5205 * eg. could retrieve the tags and write them without
5206 * using yaffs_DeleteChunk
5209 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5212 (dev->internalStartBlock * dev->param.nChunksPerBlock)
5214 ((dev->internalEndBlock +
5215 1) * dev->param.nChunksPerBlock)) {
5216 T(YAFFS_TRACE_ALWAYS,
5217 (TSTR("Found daft chunkId %d for %d" TENDSTR),
5221 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5228 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5231 int oldFileSize = in->variant.fileVariant.fileSize;
5232 __u32 newSizeOfPartialChunk;
5235 yaffs_Device *dev = in->myDev;
5237 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5239 yaffs_FlushFilesChunkCache(in);
5240 yaffs_InvalidateWholeChunkCache(in);
5242 yaffs_CheckGarbageCollection(dev);
5244 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5247 if (newSize == oldFileSize)
5250 if (newSize < oldFileSize) {
5252 yaffs_PruneResizedChunks(in, newSize);
5254 if (newSizeOfPartialChunk != 0) {
5255 int lastChunk = 1 + newFullChunks;
5257 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5259 /* Got to read and rewrite the last chunk with its new size and zero pad */
5260 yaffs_ReadChunkDataFromObject(in, lastChunk,
5263 memset(localBuffer + newSizeOfPartialChunk, 0,
5264 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5266 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5267 newSizeOfPartialChunk, 1);
5269 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5272 in->variant.fileVariant.fileSize = newSize;
5274 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5276 /* newsSize > oldFileSize */
5277 in->variant.fileVariant.fileSize = newSize;
5280 /* Write a new object header to reflect the resize.
5281 * show we've shrunk the file, if need be
5282 * Do this only if the file is not in the deleted directories
5283 * and is not shadowed.
5287 in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5288 in->parent->objectId != YAFFS_OBJECTID_DELETED)
5289 yaffs_UpdateObjectHeader(in, NULL, 0,
5290 (newSize < oldFileSize) ? 1 : 0, 0);
5295 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5297 YCHAR *alias = NULL;
5298 obj = yaffs_GetEquivalentObject(obj);
5300 switch (obj->variantType) {
5301 case YAFFS_OBJECT_TYPE_FILE:
5302 return obj->variant.fileVariant.fileSize;
5303 case YAFFS_OBJECT_TYPE_SYMLINK:
5304 alias = obj->variant.symLinkVariant.alias;
5307 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5315 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5319 yaffs_FlushFilesChunkCache(in);
5320 if(dataSync) /* Only sync data */
5324 #ifdef CONFIG_YAFFS_WINCE
5325 yfsd_WinFileTimeNow(in->win_mtime);
5328 in->yst_mtime = Y_CURRENT_TIME;
5333 retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5334 0) ? YAFFS_OK : YAFFS_FAIL;
5344 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5347 /* First off, invalidate the file's data in the cache, without flushing. */
5348 yaffs_InvalidateWholeChunkCache(in);
5350 if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5351 /* Move to the unlinked directory so we have a record that it was deleted. */
5352 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5356 yaffs_RemoveObjectFromDirectory(in);
5357 yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5360 yaffs_FreeObject(in);
5365 /* yaffs_DeleteFile deletes the whole file data
5366 * and the inode associated with the file.
5367 * It does not delete the links associated with the file.
5369 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5373 int immediateDeletion = 0;
5376 immediateDeletion = 1;
5378 if (immediateDeletion) {
5380 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5381 _Y("deleted"), 0, 0);
5382 T(YAFFS_TRACE_TRACING,
5383 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5386 in->myDev->nDeletedFiles++;
5387 if (1 || in->myDev->param.isYaffs2)
5388 yaffs_ResizeFile(in, 0);
5389 yaffs_SoftDeleteFile(in);
5392 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5393 _Y("unlinked"), 0, 0);
5400 int yaffs_DeleteFile(yaffs_Object *in)
5402 int retVal = YAFFS_OK;
5403 int deleted = in->deleted;
5405 yaffs_ResizeFile(in, 0);
5407 if (in->nDataChunks > 0) {
5408 /* Use soft deletion if there is data in the file.
5409 * That won't be the case if it has been resized to zero.
5412 retVal = yaffs_UnlinkFileIfNeeded(in);
5414 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5417 in->myDev->nDeletedFiles++;
5418 yaffs_SoftDeleteFile(in);
5420 return deleted ? YAFFS_OK : YAFFS_FAIL;
5422 /* The file has no data chunks so we toss it immediately */
5423 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5424 in->variant.fileVariant.top = NULL;
5425 yaffs_DoGenericObjectDeletion(in);
5431 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5433 return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5434 !(ylist_empty(&obj->variant.directoryVariant.children));
5437 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5439 /* First check that the directory is empty. */
5440 if (yaffs_IsNonEmptyDirectory(obj))
5443 return yaffs_DoGenericObjectDeletion(obj);
5446 static int yaffs_DeleteSymLink(yaffs_Object *in)
5448 if(in->variant.symLinkVariant.alias)
5449 YFREE(in->variant.symLinkVariant.alias);
5450 in->variant.symLinkVariant.alias=NULL;
5452 return yaffs_DoGenericObjectDeletion(in);
5455 static int yaffs_DeleteHardLink(yaffs_Object *in)
5457 /* remove this hardlink from the list assocaited with the equivalent
5460 ylist_del_init(&in->hardLinks);
5461 return yaffs_DoGenericObjectDeletion(in);
5464 int yaffs_DeleteObject(yaffs_Object *obj)
5467 switch (obj->variantType) {
5468 case YAFFS_OBJECT_TYPE_FILE:
5469 retVal = yaffs_DeleteFile(obj);
5471 case YAFFS_OBJECT_TYPE_DIRECTORY:
5472 return yaffs_DeleteDirectory(obj);
5474 case YAFFS_OBJECT_TYPE_SYMLINK:
5475 retVal = yaffs_DeleteSymLink(obj);
5477 case YAFFS_OBJECT_TYPE_HARDLINK:
5478 retVal = yaffs_DeleteHardLink(obj);
5480 case YAFFS_OBJECT_TYPE_SPECIAL:
5481 retVal = yaffs_DoGenericObjectDeletion(obj);
5483 case YAFFS_OBJECT_TYPE_UNKNOWN:
5485 break; /* should not happen. */
5491 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5494 int immediateDeletion = 0;
5497 immediateDeletion = 1;
5500 yaffs_UpdateParent(obj->parent);
5502 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5503 return yaffs_DeleteHardLink(obj);
5504 } else if (!ylist_empty(&obj->hardLinks)) {
5505 /* Curve ball: We're unlinking an object that has a hardlink.
5507 * This problem arises because we are not strictly following
5508 * The Linux link/inode model.
5510 * We can't really delete the object.
5511 * Instead, we do the following:
5512 * - Select a hardlink.
5513 * - Unhook it from the hard links
5514 * - Move it from its parent directory (so that the rename can work)
5515 * - Rename the object to the hardlink's name.
5516 * - Delete the hardlink
5520 yaffs_Object *parent;
5522 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5524 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5526 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5527 parent = hl->parent;
5529 ylist_del_init(&hl->hardLinks);
5531 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5533 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5535 if (retVal == YAFFS_OK)
5536 retVal = yaffs_DoGenericObjectDeletion(hl);
5540 } else if (immediateDeletion) {
5541 switch (obj->variantType) {
5542 case YAFFS_OBJECT_TYPE_FILE:
5543 return yaffs_DeleteFile(obj);
5545 case YAFFS_OBJECT_TYPE_DIRECTORY:
5546 return yaffs_DeleteDirectory(obj);
5548 case YAFFS_OBJECT_TYPE_SYMLINK:
5549 return yaffs_DeleteSymLink(obj);
5551 case YAFFS_OBJECT_TYPE_SPECIAL:
5552 return yaffs_DoGenericObjectDeletion(obj);
5554 case YAFFS_OBJECT_TYPE_HARDLINK:
5555 case YAFFS_OBJECT_TYPE_UNKNOWN:
5559 } else if(yaffs_IsNonEmptyDirectory(obj))
5562 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5563 _Y("unlinked"), 0, 0);
5567 static int yaffs_UnlinkObject(yaffs_Object *obj)
5570 if (obj && obj->unlinkAllowed)
5571 return yaffs_UnlinkWorker(obj);
5576 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5580 obj = yaffs_FindObjectByName(dir, name);
5581 return yaffs_UnlinkObject(obj);
5584 /*----------------------- Initialisation Scanning ---------------------- */
5586 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5587 int backwardScanning)
5591 if (!backwardScanning) {
5592 /* Handle YAFFS1 forward scanning case
5593 * For YAFFS1 we always do the deletion
5597 /* Handle YAFFS2 case (backward scanning)
5598 * If the shadowed object exists then ignore.
5600 obj = yaffs_FindObjectByNumber(dev, objId);
5605 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5606 * We put it in unlinked dir to be cleaned up after the scanning
5609 yaffs_FindOrCreateObjectByNumber(dev, objId,
5610 YAFFS_OBJECT_TYPE_FILE);
5613 obj->isShadowed = 1;
5614 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5615 obj->variant.fileVariant.shrinkSize = 0;
5616 obj->valid = 1; /* So that we don't read any other info for this file */
5626 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5633 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5635 in = yaffs_FindObjectByNumber(dev,
5636 hl->variant.hardLinkVariant.
5637 equivalentObjectId);
5640 /* Add the hardlink pointers */
5641 hl->variant.hardLinkVariant.equivalentObject = in;
5642 ylist_add(&hl->hardLinks, &in->hardLinks);
5644 /* Todo Need to report/handle this better.
5645 * Got a problem... hardlink to a non-existant object
5647 hl->variant.hardLinkVariant.equivalentObject = NULL;
5648 YINIT_LIST_HEAD(&hl->hardLinks);
5658 static int ybicmp(const void *a, const void *b)
5660 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5661 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5662 register int ablock = ((yaffs_BlockIndex *)a)->block;
5663 register int bblock = ((yaffs_BlockIndex *)b)->block;
5665 return ablock - bblock;
5671 struct yaffs_ShadowFixerStruct {
5674 struct yaffs_ShadowFixerStruct *next;
5678 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5681 * Sort out state of unlinked and deleted objects after scanning.
5683 struct ylist_head *i;
5684 struct ylist_head *n;
5687 /* Soft delete all the unlinked files */
5688 ylist_for_each_safe(i, n,
5689 &dev->unlinkedDir->variant.directoryVariant.children) {
5691 l = ylist_entry(i, yaffs_Object, siblings);
5692 yaffs_DeleteObject(l);
5696 ylist_for_each_safe(i, n,
5697 &dev->deletedDir->variant.directoryVariant.children) {
5699 l = ylist_entry(i, yaffs_Object, siblings);
5700 yaffs_DeleteObject(l);
5707 * This code iterates through all the objects making sure that they are rooted.
5708 * Any unrooted objects are re-rooted in lost+found.
5709 * An object needs to be in one of:
5710 * - Directly under deleted, unlinked
5711 * - Directly or indirectly under root.
5714 * This code assumes that we don't ever change the current relationships between
5716 * rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5717 * lostNfound->parent == rootDir
5719 * This fixes the problem where directories might have inadvertently been deleted
5720 * leaving the object "hanging" without being rooted in the directory tree.
5723 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5725 return (obj == dev->deletedDir ||
5726 obj == dev->unlinkedDir||
5727 obj == dev->rootDir);
5730 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5733 yaffs_Object *parent;
5735 struct ylist_head *lh;
5736 struct ylist_head *n;
5741 /* Iterate through the objects in each hash entry,
5742 * looking at each object.
5743 * Make sure it is rooted.
5746 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
5747 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5749 obj = ylist_entry(lh, yaffs_Object, hashLink);
5750 parent= obj->parent;
5752 if(yaffs_HasNULLParent(dev,obj)){
5753 /* These directories are not hanging */
5756 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5758 else if(yaffs_HasNULLParent(dev,parent))
5762 * Need to follow the parent chain to see if it is hanging.
5767 while(parent != dev->rootDir &&
5769 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5771 parent = parent->parent;
5774 if(parent != dev->rootDir)
5779 (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5781 yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5790 * Delete directory contents for cleaning up lost and found.
5792 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
5795 struct ylist_head *lh;
5796 struct ylist_head *n;
5798 if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5801 ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
5803 obj = ylist_entry(lh, yaffs_Object, siblings);
5804 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
5805 yaffs_DeleteDirectoryContents(obj);
5808 (TSTR("Deleting lost_found object %d" TENDSTR),
5811 /* Need to use UnlinkObject since Delete would not handle
5812 * hardlinked objects correctly.
5814 yaffs_UnlinkObject(obj);
5820 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
5822 yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
5825 static int yaffs_Scan(yaffs_Device *dev)
5827 yaffs_ExtendedTags tags;
5837 yaffs_BlockState state;
5838 yaffs_Object *hardList = NULL;
5839 yaffs_BlockInfo *bi;
5840 __u32 sequenceNumber;
5841 yaffs_ObjectHeader *oh;
5843 yaffs_Object *parent;
5845 int alloc_failed = 0;
5847 struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5855 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5856 dev->internalStartBlock, dev->internalEndBlock));
5858 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5860 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5862 /* Scan all the blocks to determine their state */
5863 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5864 bi = yaffs_GetBlockInfo(dev, blk);
5865 yaffs_ClearChunkBits(dev, blk);
5867 bi->softDeletions = 0;
5869 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5871 bi->blockState = state;
5872 bi->sequenceNumber = sequenceNumber;
5874 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5875 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5877 T(YAFFS_TRACE_SCAN_DEBUG,
5878 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5879 state, sequenceNumber));
5881 if (state == YAFFS_BLOCK_STATE_DEAD) {
5882 T(YAFFS_TRACE_BAD_BLOCKS,
5883 (TSTR("block %d is bad" TENDSTR), blk));
5884 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5885 T(YAFFS_TRACE_SCAN_DEBUG,
5886 (TSTR("Block empty " TENDSTR)));
5887 dev->nErasedBlocks++;
5888 dev->nFreeChunks += dev->param.nChunksPerBlock;
5892 startIterator = dev->internalStartBlock;
5893 endIterator = dev->internalEndBlock;
5895 /* For each block.... */
5896 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5903 blk = blockIterator;
5905 bi = yaffs_GetBlockInfo(dev, blk);
5906 state = bi->blockState;
5910 /* For each chunk in each block that needs scanning....*/
5911 for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
5912 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5913 /* Read the tags and decide what to do */
5914 chunk = blk * dev->param.nChunksPerBlock + c;
5916 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5919 /* Let's have a good look at this chunk... */
5921 if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5927 /*T((" %d %d deleted\n",blk,c)); */
5928 } else if (!tags.chunkUsed) {
5929 /* An unassigned chunk in the block
5930 * This means that either the block is empty or
5931 * this is the one being allocated from
5935 /* We're looking at the first chunk in the block so the block is unused */
5936 state = YAFFS_BLOCK_STATE_EMPTY;
5937 dev->nErasedBlocks++;
5939 /* this is the block being allocated from */
5942 (" Allocating from %d %d" TENDSTR),
5944 state = YAFFS_BLOCK_STATE_ALLOCATING;
5945 dev->allocationBlock = blk;
5946 dev->allocationPage = c;
5947 dev->allocationBlockFinder = blk;
5948 /* Set block finder here to encourage the allocator to go forth from here. */
5952 dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
5953 } else if (tags.chunkId > 0) {
5954 /* chunkId > 0 so it is a data chunk... */
5955 unsigned int endpos;
5957 yaffs_SetChunkBit(dev, blk, c);
5960 in = yaffs_FindOrCreateObjectByNumber(dev,
5963 YAFFS_OBJECT_TYPE_FILE);
5964 /* PutChunkIntoFile checks for a clash (two data chunks with
5965 * the same chunkId).
5972 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5977 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5980 in->variantType == YAFFS_OBJECT_TYPE_FILE
5981 && in->variant.fileVariant.scannedFileSize <
5983 in->variant.fileVariant.
5984 scannedFileSize = endpos;
5985 if (!dev->param.useHeaderFileSize) {
5986 in->variant.fileVariant.
5988 in->variant.fileVariant.
5993 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5995 /* chunkId == 0, so it is an ObjectHeader.
5996 * Thus, we read in the object header and make the object
5998 yaffs_SetChunkBit(dev, blk, c);
6001 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
6005 oh = (yaffs_ObjectHeader *) chunkData;
6007 in = yaffs_FindObjectByNumber(dev,
6009 if (in && in->variantType != oh->type) {
6010 /* This should not happen, but somehow
6011 * Wev'e ended up with an objectId that has been reused but not yet
6012 * deleted, and worse still it has changed type. Delete the old object.
6015 yaffs_DeleteObject(in);
6020 in = yaffs_FindOrCreateObjectByNumber(dev,
6028 if (in && oh->shadowsObject > 0) {
6030 struct yaffs_ShadowFixerStruct *fixer;
6031 fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
6033 fixer->next = shadowFixerList;
6034 shadowFixerList = fixer;
6035 fixer->objectId = tags.objectId;
6036 fixer->shadowedId = oh->shadowsObject;
6041 if (in && in->valid) {
6042 /* We have already filled this one. We have a duplicate and need to resolve it. */
6044 unsigned existingSerial = in->serial;
6045 unsigned newSerial = tags.serialNumber;
6047 if (((existingSerial + 1) & 3) == newSerial) {
6048 /* Use new one - destroy the exisiting one */
6049 yaffs_DeleteChunk(dev,
6054 /* Use existing - destroy this one. */
6055 yaffs_DeleteChunk(dev, chunk, 1,
6060 if (in && !in->valid &&
6061 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6062 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
6063 /* We only load some info, don't fiddle with directory structure */
6065 in->variantType = oh->type;
6067 in->yst_mode = oh->yst_mode;
6068 #ifdef CONFIG_YAFFS_WINCE
6069 in->win_atime[0] = oh->win_atime[0];
6070 in->win_ctime[0] = oh->win_ctime[0];
6071 in->win_mtime[0] = oh->win_mtime[0];
6072 in->win_atime[1] = oh->win_atime[1];
6073 in->win_ctime[1] = oh->win_ctime[1];
6074 in->win_mtime[1] = oh->win_mtime[1];
6076 in->yst_uid = oh->yst_uid;
6077 in->yst_gid = oh->yst_gid;
6078 in->yst_atime = oh->yst_atime;
6079 in->yst_mtime = oh->yst_mtime;
6080 in->yst_ctime = oh->yst_ctime;
6081 in->yst_rdev = oh->yst_rdev;
6083 in->hdrChunk = chunk;
6084 in->serial = tags.serialNumber;
6086 } else if (in && !in->valid) {
6087 /* we need to load this info */
6090 in->variantType = oh->type;
6092 in->yst_mode = oh->yst_mode;
6093 #ifdef CONFIG_YAFFS_WINCE
6094 in->win_atime[0] = oh->win_atime[0];
6095 in->win_ctime[0] = oh->win_ctime[0];
6096 in->win_mtime[0] = oh->win_mtime[0];
6097 in->win_atime[1] = oh->win_atime[1];
6098 in->win_ctime[1] = oh->win_ctime[1];
6099 in->win_mtime[1] = oh->win_mtime[1];
6101 in->yst_uid = oh->yst_uid;
6102 in->yst_gid = oh->yst_gid;
6103 in->yst_atime = oh->yst_atime;
6104 in->yst_mtime = oh->yst_mtime;
6105 in->yst_ctime = oh->yst_ctime;
6106 in->yst_rdev = oh->yst_rdev;
6108 in->hdrChunk = chunk;
6109 in->serial = tags.serialNumber;
6111 yaffs_SetObjectName(in, oh->name);
6114 /* directory stuff...
6119 yaffs_FindOrCreateObjectByNumber
6120 (dev, oh->parentObjectId,
6121 YAFFS_OBJECT_TYPE_DIRECTORY);
6124 if (parent && parent->variantType ==
6125 YAFFS_OBJECT_TYPE_UNKNOWN) {
6126 /* Set up as a directory */
6127 parent->variantType =
6128 YAFFS_OBJECT_TYPE_DIRECTORY;
6129 YINIT_LIST_HEAD(&parent->variant.
6132 } else if (!parent || parent->variantType !=
6133 YAFFS_OBJECT_TYPE_DIRECTORY) {
6134 /* Hoosterman, another problem....
6135 * We're trying to use a non-directory as a directory
6138 T(YAFFS_TRACE_ERROR,
6140 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6142 parent = dev->lostNFoundDir;
6145 yaffs_AddObjectToDirectory(parent, in);
6147 if (0 && (parent == dev->deletedDir ||
6148 parent == dev->unlinkedDir)) {
6149 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
6150 dev->nDeletedFiles++;
6152 /* Note re hardlinks.
6153 * Since we might scan a hardlink before its equivalent object is scanned
6154 * we put them all in a list.
6155 * After scanning is complete, we should have all the objects, so we run through this
6156 * list and fix up all the chains.
6159 switch (in->variantType) {
6160 case YAFFS_OBJECT_TYPE_UNKNOWN:
6161 /* Todo got a problem */
6163 case YAFFS_OBJECT_TYPE_FILE:
6164 if (dev->param.useHeaderFileSize)
6166 in->variant.fileVariant.
6171 case YAFFS_OBJECT_TYPE_HARDLINK:
6172 in->variant.hardLinkVariant.
6173 equivalentObjectId =
6174 oh->equivalentObjectId;
6175 in->hardLinks.next =
6176 (struct ylist_head *)
6180 case YAFFS_OBJECT_TYPE_DIRECTORY:
6183 case YAFFS_OBJECT_TYPE_SPECIAL:
6186 case YAFFS_OBJECT_TYPE_SYMLINK:
6187 in->variant.symLinkVariant.alias =
6188 yaffs_CloneString(oh->alias);
6189 if (!in->variant.symLinkVariant.alias)
6198 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6199 /* If we got this far while scanning, then the block is fully allocated.*/
6200 state = YAFFS_BLOCK_STATE_FULL;
6203 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6204 /* If the block was partially allocated then treat it as fully allocated.*/
6205 state = YAFFS_BLOCK_STATE_FULL;
6206 dev->allocationBlock = -1;
6209 bi->blockState = state;
6211 /* Now let's see if it was dirty */
6212 if (bi->pagesInUse == 0 &&
6213 !bi->hasShrinkHeader &&
6214 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6215 yaffs_BlockBecameDirty(dev, blk);
6221 /* Ok, we've done all the scanning.
6222 * Fix up the hard link chains.
6223 * We should now have scanned all the objects, now it's time to add these
6227 yaffs_HardlinkFixup(dev, hardList);
6229 /* Fix up any shadowed objects */
6231 struct yaffs_ShadowFixerStruct *fixer;
6234 while (shadowFixerList) {
6235 fixer = shadowFixerList;
6236 shadowFixerList = fixer->next;
6237 /* Complete the rename transaction by deleting the shadowed object
6238 * then setting the object header to unshadowed.
6240 obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6242 yaffs_DeleteObject(obj);
6244 obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6247 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6253 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6258 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6264 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6267 yaffs_ObjectHeader *oh;
6269 yaffs_ExtendedTags tags;
6271 int alloc_failed = 0;
6279 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6281 in->lazyLoaded ? "not yet" : "already"));
6284 if (in->lazyLoaded && in->hdrChunk > 0) {
6286 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6288 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6289 oh = (yaffs_ObjectHeader *) chunkData;
6291 in->yst_mode = oh->yst_mode;
6292 #ifdef CONFIG_YAFFS_WINCE
6293 in->win_atime[0] = oh->win_atime[0];
6294 in->win_ctime[0] = oh->win_ctime[0];
6295 in->win_mtime[0] = oh->win_mtime[0];
6296 in->win_atime[1] = oh->win_atime[1];
6297 in->win_ctime[1] = oh->win_ctime[1];
6298 in->win_mtime[1] = oh->win_mtime[1];
6300 in->yst_uid = oh->yst_uid;
6301 in->yst_gid = oh->yst_gid;
6302 in->yst_atime = oh->yst_atime;
6303 in->yst_mtime = oh->yst_mtime;
6304 in->yst_ctime = oh->yst_ctime;
6305 in->yst_rdev = oh->yst_rdev;
6308 yaffs_SetObjectName(in, oh->name);
6310 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6311 in->variant.symLinkVariant.alias =
6312 yaffs_CloneString(oh->alias);
6313 if (!in->variant.symLinkVariant.alias)
6314 alloc_failed = 1; /* Not returned to caller */
6317 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6321 static int yaffs_ScanBackwards(yaffs_Device *dev)
6323 yaffs_ExtendedTags tags;
6328 int nBlocksToScan = 0;
6334 yaffs_BlockState state;
6335 yaffs_Object *hardList = NULL;
6336 yaffs_BlockInfo *bi;
6337 __u32 sequenceNumber;
6338 yaffs_ObjectHeader *oh;
6340 yaffs_Object *parent;
6341 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6347 int foundChunksInBlock;
6348 int equivalentObjectId;
6349 int alloc_failed = 0;
6352 yaffs_BlockIndex *blockIndex = NULL;
6353 int altBlockIndex = 0;
6355 if (!dev->param.isYaffs2) {
6357 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6363 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
6364 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6367 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6369 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6372 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6378 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6382 dev->blocksInCheckpoint = 0;
6384 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6386 /* Scan all the blocks to determine their state */
6387 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6388 bi = yaffs_GetBlockInfo(dev, blk);
6389 yaffs_ClearChunkBits(dev, blk);
6391 bi->softDeletions = 0;
6393 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6395 bi->blockState = state;
6396 bi->sequenceNumber = sequenceNumber;
6398 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6399 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6400 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6401 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6403 T(YAFFS_TRACE_SCAN_DEBUG,
6404 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6405 state, sequenceNumber));
6408 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6409 dev->blocksInCheckpoint++;
6411 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6412 T(YAFFS_TRACE_BAD_BLOCKS,
6413 (TSTR("block %d is bad" TENDSTR), blk));
6414 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6415 T(YAFFS_TRACE_SCAN_DEBUG,
6416 (TSTR("Block empty " TENDSTR)));
6417 dev->nErasedBlocks++;
6418 dev->nFreeChunks += dev->param.nChunksPerBlock;
6419 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6421 /* Determine the highest sequence number */
6422 if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6423 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6425 blockIndex[nBlocksToScan].seq = sequenceNumber;
6426 blockIndex[nBlocksToScan].block = blk;
6430 if (sequenceNumber >= dev->sequenceNumber)
6431 dev->sequenceNumber = sequenceNumber;
6433 /* TODO: Nasty sequence number! */
6436 ("Block scanning block %d has bad sequence number %d"
6437 TENDSTR), blk, sequenceNumber));
6444 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6450 /* Sort the blocks */
6451 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6453 /* Use qsort now. */
6454 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6458 /* Dungy old bubble sort... */
6460 yaffs_BlockIndex temp;
6464 for (i = 0; i < nBlocksToScan; i++)
6465 for (j = i + 1; j < nBlocksToScan; j++)
6466 if (blockIndex[i].seq > blockIndex[j].seq) {
6467 temp = blockIndex[j];
6468 blockIndex[j] = blockIndex[i];
6469 blockIndex[i] = temp;
6476 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6478 /* Now scan the blocks looking at the data. */
6480 endIterator = nBlocksToScan - 1;
6481 T(YAFFS_TRACE_SCAN_DEBUG,
6482 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6484 /* For each block.... backwards */
6485 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6487 /* Cooperative multitasking! This loop can run for so
6488 long that watchdog timers expire. */
6491 /* get the block to scan in the correct order */
6492 blk = blockIndex[blockIterator].block;
6494 bi = yaffs_GetBlockInfo(dev, blk);
6497 state = bi->blockState;
6501 /* For each chunk in each block that needs scanning.... */
6502 foundChunksInBlock = 0;
6503 for (c = dev->param.nChunksPerBlock - 1;
6504 !alloc_failed && c >= 0 &&
6505 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6506 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6507 /* Scan backwards...
6508 * Read the tags and decide what to do
6511 chunk = blk * dev->param.nChunksPerBlock + c;
6513 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6516 /* Let's have a good look at this chunk... */
6518 if (!tags.chunkUsed) {
6519 /* An unassigned chunk in the block.
6520 * If there are used chunks after this one, then
6521 * it is a chunk that was skipped due to failing the erased
6522 * check. Just skip it so that it can be deleted.
6523 * But, more typically, We get here when this is an unallocated
6524 * chunk and his means that either the block is empty or
6525 * this is the one being allocated from
6528 if (foundChunksInBlock) {
6529 /* This is a chunk that was skipped due to failing the erased check */
6530 } else if (c == 0) {
6531 /* We're looking at the first chunk in the block so the block is unused */
6532 state = YAFFS_BLOCK_STATE_EMPTY;
6533 dev->nErasedBlocks++;
6535 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6536 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6537 if (dev->sequenceNumber == bi->sequenceNumber) {
6538 /* this is the block being allocated from */
6542 (" Allocating from %d %d"
6545 state = YAFFS_BLOCK_STATE_ALLOCATING;
6546 dev->allocationBlock = blk;
6547 dev->allocationPage = c;
6548 dev->allocationBlockFinder = blk;
6550 /* This is a partially written block that is not
6551 * the current allocation block.
6554 T(YAFFS_TRACE_ALWAYS,
6555 (TSTR("Partially written block %d detected" TENDSTR),
6563 } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6565 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6570 } else if (tags.chunkId > 0) {
6571 /* chunkId > 0 so it is a data chunk... */
6572 unsigned int endpos;
6574 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6576 foundChunksInBlock = 1;
6579 yaffs_SetChunkBit(dev, blk, c);
6582 in = yaffs_FindOrCreateObjectByNumber(dev,
6585 YAFFS_OBJECT_TYPE_FILE);
6592 in->variantType == YAFFS_OBJECT_TYPE_FILE
6593 && chunkBase < in->variant.fileVariant.shrinkSize) {
6594 /* This has not been invalidated by a resize */
6595 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
6599 /* File size is calculated by looking at the data chunks if we have not
6600 * seen an object header yet. Stop this practice once we find an object header.
6602 endpos = chunkBase + tags.byteCount;
6604 if (!in->valid && /* have not got an object header yet */
6605 in->variant.fileVariant.scannedFileSize < endpos) {
6606 in->variant.fileVariant.scannedFileSize = endpos;
6607 in->variant.fileVariant.fileSize = endpos;
6611 /* This chunk has been invalidated by a resize, or a past file deletion
6612 * so delete the chunk*/
6613 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6617 /* chunkId == 0, so it is an ObjectHeader.
6618 * Thus, we read in the object header and make the object
6620 foundChunksInBlock = 1;
6622 yaffs_SetChunkBit(dev, blk, c);
6628 if (tags.extraHeaderInfoAvailable) {
6629 in = yaffs_FindOrCreateObjectByNumber(dev,
6631 tags.extraObjectType);
6637 (!in->valid && dev->param.disableLazyLoad) ||
6638 tags.extraShadows ||
6640 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6641 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6643 /* If we don't have valid info then we need to read the chunk
6644 * TODO In future we can probably defer reading the chunk and
6645 * living with invalid data until needed.
6648 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6653 oh = (yaffs_ObjectHeader *) chunkData;
6655 if (dev->param.inbandTags) {
6656 /* Fix up the header if they got corrupted by inband tags */
6657 oh->shadowsObject = oh->inbandShadowsObject;
6658 oh->isShrink = oh->inbandIsShrink;
6662 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6670 /* TODO Hoosterman we have a problem! */
6671 T(YAFFS_TRACE_ERROR,
6673 ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
6674 TENDSTR), tags.objectId, chunk));
6679 /* We have already filled this one.
6680 * We have a duplicate that will be discarded, but
6681 * we first have to suck out resize info if it is a file.
6684 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6686 oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6687 (tags.extraHeaderInfoAvailable &&
6688 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6690 (oh) ? oh->fileSize : tags.
6692 __u32 parentObjectId =
6694 parentObjectId : tags.
6695 extraParentObjectId;
6699 (oh) ? oh->isShrink : tags.
6700 extraIsShrinkHeader;
6702 /* If it is deleted (unlinked at start also means deleted)
6703 * we treat the file size as being zeroed at this point.
6705 if (parentObjectId ==
6706 YAFFS_OBJECTID_DELETED
6707 || parentObjectId ==
6708 YAFFS_OBJECTID_UNLINKED) {
6713 if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
6714 in->variant.fileVariant.shrinkSize = thisSize;
6717 bi->hasShrinkHeader = 1;
6720 /* Use existing - destroy this one. */
6721 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6725 if (!in->valid && in->variantType !=
6726 (oh ? oh->type : tags.extraObjectType))
6727 T(YAFFS_TRACE_ERROR, (
6728 TSTR("yaffs tragedy: Bad object type, "
6729 TCONT("%d != %d, for object %d at chunk ")
6730 TCONT("%d during scan")
6732 oh->type : tags.extraObjectType,
6733 in->variantType, tags.objectId,
6737 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6739 YAFFS_OBJECTID_LOSTNFOUND)) {
6740 /* We only load some info, don't fiddle with directory structure */
6744 in->variantType = oh->type;
6746 in->yst_mode = oh->yst_mode;
6747 #ifdef CONFIG_YAFFS_WINCE
6748 in->win_atime[0] = oh->win_atime[0];
6749 in->win_ctime[0] = oh->win_ctime[0];
6750 in->win_mtime[0] = oh->win_mtime[0];
6751 in->win_atime[1] = oh->win_atime[1];
6752 in->win_ctime[1] = oh->win_ctime[1];
6753 in->win_mtime[1] = oh->win_mtime[1];
6755 in->yst_uid = oh->yst_uid;
6756 in->yst_gid = oh->yst_gid;
6757 in->yst_atime = oh->yst_atime;
6758 in->yst_mtime = oh->yst_mtime;
6759 in->yst_ctime = oh->yst_ctime;
6760 in->yst_rdev = oh->yst_rdev;
6764 in->variantType = tags.extraObjectType;
6768 in->hdrChunk = chunk;
6770 } else if (!in->valid) {
6771 /* we need to load this info */
6774 in->hdrChunk = chunk;
6777 in->variantType = oh->type;
6779 in->yst_mode = oh->yst_mode;
6780 #ifdef CONFIG_YAFFS_WINCE
6781 in->win_atime[0] = oh->win_atime[0];
6782 in->win_ctime[0] = oh->win_ctime[0];
6783 in->win_mtime[0] = oh->win_mtime[0];
6784 in->win_atime[1] = oh->win_atime[1];
6785 in->win_ctime[1] = oh->win_ctime[1];
6786 in->win_mtime[1] = oh->win_mtime[1];
6788 in->yst_uid = oh->yst_uid;
6789 in->yst_gid = oh->yst_gid;
6790 in->yst_atime = oh->yst_atime;
6791 in->yst_mtime = oh->yst_mtime;
6792 in->yst_ctime = oh->yst_ctime;
6793 in->yst_rdev = oh->yst_rdev;
6796 if (oh->shadowsObject > 0)
6797 yaffs_HandleShadowedObject(dev,
6804 yaffs_SetObjectName(in, oh->name);
6806 yaffs_FindOrCreateObjectByNumber
6807 (dev, oh->parentObjectId,
6808 YAFFS_OBJECT_TYPE_DIRECTORY);
6810 fileSize = oh->fileSize;
6811 isShrink = oh->isShrink;
6812 equivalentObjectId = oh->equivalentObjectId;
6815 in->variantType = tags.extraObjectType;
6817 yaffs_FindOrCreateObjectByNumber
6818 (dev, tags.extraParentObjectId,
6819 YAFFS_OBJECT_TYPE_DIRECTORY);
6820 fileSize = tags.extraFileLength;
6821 isShrink = tags.extraIsShrinkHeader;
6822 equivalentObjectId = tags.extraEquivalentObjectId;
6831 /* directory stuff...
6835 if (parent && parent->variantType ==
6836 YAFFS_OBJECT_TYPE_UNKNOWN) {
6837 /* Set up as a directory */
6838 parent->variantType =
6839 YAFFS_OBJECT_TYPE_DIRECTORY;
6840 YINIT_LIST_HEAD(&parent->variant.
6843 } else if (!parent || parent->variantType !=
6844 YAFFS_OBJECT_TYPE_DIRECTORY) {
6845 /* Hoosterman, another problem....
6846 * We're trying to use a non-directory as a directory
6849 T(YAFFS_TRACE_ERROR,
6851 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6853 parent = dev->lostNFoundDir;
6856 yaffs_AddObjectToDirectory(parent, in);
6858 itsUnlinked = (parent == dev->deletedDir) ||
6859 (parent == dev->unlinkedDir);
6862 /* Mark the block as having a shrinkHeader */
6863 bi->hasShrinkHeader = 1;
6866 /* Note re hardlinks.
6867 * Since we might scan a hardlink before its equivalent object is scanned
6868 * we put them all in a list.
6869 * After scanning is complete, we should have all the objects, so we run
6870 * through this list and fix up all the chains.
6873 switch (in->variantType) {
6874 case YAFFS_OBJECT_TYPE_UNKNOWN:
6875 /* Todo got a problem */
6877 case YAFFS_OBJECT_TYPE_FILE:
6879 if (in->variant.fileVariant.
6880 scannedFileSize < fileSize) {
6881 /* This covers the case where the file size is greater
6882 * than where the data is
6883 * This will happen if the file is resized to be larger
6884 * than its current data extents.
6886 in->variant.fileVariant.fileSize = fileSize;
6887 in->variant.fileVariant.scannedFileSize = fileSize;
6890 if (in->variant.fileVariant.shrinkSize > fileSize)
6891 in->variant.fileVariant.shrinkSize = fileSize;
6895 case YAFFS_OBJECT_TYPE_HARDLINK:
6897 in->variant.hardLinkVariant.equivalentObjectId =
6899 in->hardLinks.next =
6900 (struct ylist_head *) hardList;
6904 case YAFFS_OBJECT_TYPE_DIRECTORY:
6907 case YAFFS_OBJECT_TYPE_SPECIAL:
6910 case YAFFS_OBJECT_TYPE_SYMLINK:
6912 in->variant.symLinkVariant.alias =
6913 yaffs_CloneString(oh->alias);
6914 if (!in->variant.symLinkVariant.alias)
6924 } /* End of scanning for each chunk */
6926 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6927 /* If we got this far while scanning, then the block is fully allocated. */
6928 state = YAFFS_BLOCK_STATE_FULL;
6932 bi->blockState = state;
6934 /* Now let's see if it was dirty */
6935 if (bi->pagesInUse == 0 &&
6936 !bi->hasShrinkHeader &&
6937 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6938 yaffs_BlockBecameDirty(dev, blk);
6943 yaffs_SkipRestOfBlock(dev);
6946 YFREE_ALT(blockIndex);
6950 /* Ok, we've done all the scanning.
6951 * Fix up the hard link chains.
6952 * We should now have scanned all the objects, now it's time to add these
6955 yaffs_HardlinkFixup(dev, hardList);
6958 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6963 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6968 /*------------------------------ Directory Functions ----------------------------- */
6970 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6972 struct ylist_head *lh;
6973 yaffs_Object *listObj;
6978 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6983 if (yaffs_SkipVerification(obj->myDev))
6987 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6992 if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6993 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6997 /* Iterate through the objects in each hash entry */
6999 ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
7001 listObj = ylist_entry(lh, yaffs_Object, siblings);
7002 yaffs_VerifyObject(listObj);
7009 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
7014 static void yaffs_VerifyDirectory(yaffs_Object *directory)
7016 struct ylist_head *lh;
7017 yaffs_Object *listObj;
7024 if (yaffs_SkipFullVerification(directory->myDev))
7027 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7028 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
7032 /* Iterate through the objects in each hash entry */
7034 ylist_for_each(lh, &directory->variant.directoryVariant.children) {
7036 listObj = ylist_entry(lh, yaffs_Object, siblings);
7037 if (listObj->parent != directory) {
7038 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
7041 yaffs_VerifyObjectInDirectory(listObj);
7047 *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
7048 * link (ie. name) is created or deleted in the directory.
7051 * create dir/a : update dir's mtime/ctime
7052 * rm dir/a: update dir's mtime/ctime
7053 * modify dir/a: don't update dir's mtimme/ctime
7056 static void yaffs_UpdateParent(yaffs_Object *obj)
7062 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
7064 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7067 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
7069 yaffs_Device *dev = obj->myDev;
7070 yaffs_Object *parent;
7072 yaffs_VerifyObjectInDirectory(obj);
7073 parent = obj->parent;
7075 yaffs_VerifyDirectory(parent);
7077 if (dev && dev->param.removeObjectCallback)
7078 dev->param.removeObjectCallback(obj);
7081 ylist_del_init(&obj->siblings);
7084 yaffs_VerifyDirectory(parent);
7087 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
7091 T(YAFFS_TRACE_ALWAYS,
7093 ("tragedy: Trying to add an object to a null pointer directory"
7098 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7099 T(YAFFS_TRACE_ALWAYS,
7101 ("tragedy: Trying to add an object to a non-directory"
7106 if (obj->siblings.prev == NULL) {
7107 /* Not initialised */
7112 yaffs_VerifyDirectory(directory);
7114 yaffs_RemoveObjectFromDirectory(obj);
7118 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7119 obj->parent = directory;
7121 if (directory == obj->myDev->unlinkedDir
7122 || directory == obj->myDev->deletedDir) {
7124 obj->myDev->nUnlinkedFiles++;
7125 obj->renameAllowed = 0;
7128 yaffs_VerifyDirectory(directory);
7129 yaffs_VerifyObjectInDirectory(obj);
7132 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7137 struct ylist_head *i;
7138 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7146 T(YAFFS_TRACE_ALWAYS,
7148 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7153 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7154 T(YAFFS_TRACE_ALWAYS,
7156 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7160 sum = yaffs_CalcNameSum(name);
7162 ylist_for_each(i, &directory->variant.directoryVariant.children) {
7164 l = ylist_entry(i, yaffs_Object, siblings);
7166 if (l->parent != directory)
7169 yaffs_CheckObjectDetailsLoaded(l);
7171 /* Special case for lost-n-found */
7172 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7173 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7175 } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7176 /* LostnFound chunk called Objxxx
7179 yaffs_GetObjectName(l, buffer,
7180 YAFFS_MAX_NAME_LENGTH + 1);
7181 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7192 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7193 int (*fn) (yaffs_Object *))
7195 struct ylist_head *i;
7199 T(YAFFS_TRACE_ALWAYS,
7201 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7206 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7207 T(YAFFS_TRACE_ALWAYS,
7209 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7214 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7216 l = ylist_entry(i, yaffs_Object, siblings);
7227 /* GetEquivalentObject dereferences any hard links to get to the
7231 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7233 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7234 /* We want the object id of the equivalent object, not this one */
7235 obj = obj->variant.hardLinkVariant.equivalentObject;
7236 yaffs_CheckObjectDetailsLoaded(obj);
7241 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7243 memset(name, 0, buffSize * sizeof(YCHAR));
7245 yaffs_CheckObjectDetailsLoaded(obj);
7247 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7248 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7249 } else if (obj->hdrChunk <= 0) {
7251 YCHAR numString[20];
7252 YCHAR *x = &numString[19];
7253 unsigned v = obj->objectId;
7257 *x = '0' + (v % 10);
7260 /* make up a name */
7261 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7262 yaffs_strcat(locName, x);
7263 yaffs_strncpy(name, locName, buffSize - 1);
7266 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7267 else if (obj->shortName[0])
7268 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7272 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7274 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7276 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7278 if (obj->hdrChunk > 0) {
7279 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7280 obj->hdrChunk, buffer,
7283 yaffs_strncpy(name, oh->name, buffSize - 1);
7286 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7289 return yaffs_strnlen(name,buffSize-1);
7292 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7294 /* Dereference any hard linking */
7295 obj = yaffs_GetEquivalentObject(obj);
7297 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7298 return obj->variant.fileVariant.fileSize;
7299 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7300 if(!obj->variant.symLinkVariant.alias)
7302 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7304 /* Only a directory should drop through to here */
7305 return obj->myDev->nDataBytesPerChunk;
7309 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7312 struct ylist_head *i;
7315 count++; /* the object itself */
7317 ylist_for_each(i, &obj->hardLinks)
7318 count++; /* add the hard links; */
7323 int yaffs_GetObjectInode(yaffs_Object *obj)
7325 obj = yaffs_GetEquivalentObject(obj);
7327 return obj->objectId;
7330 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7332 obj = yaffs_GetEquivalentObject(obj);
7334 switch (obj->variantType) {
7335 case YAFFS_OBJECT_TYPE_FILE:
7338 case YAFFS_OBJECT_TYPE_DIRECTORY:
7341 case YAFFS_OBJECT_TYPE_SYMLINK:
7344 case YAFFS_OBJECT_TYPE_HARDLINK:
7347 case YAFFS_OBJECT_TYPE_SPECIAL:
7348 if (S_ISFIFO(obj->yst_mode))
7350 if (S_ISCHR(obj->yst_mode))
7352 if (S_ISBLK(obj->yst_mode))
7354 if (S_ISSOCK(obj->yst_mode))
7362 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7364 obj = yaffs_GetEquivalentObject(obj);
7365 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7366 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7368 return yaffs_CloneString(_Y(""));
7371 #ifndef CONFIG_YAFFS_WINCE
7373 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7375 unsigned int valid = attr->ia_valid;
7377 if (valid & ATTR_MODE)
7378 obj->yst_mode = attr->ia_mode;
7379 if (valid & ATTR_UID)
7380 obj->yst_uid = attr->ia_uid;
7381 if (valid & ATTR_GID)
7382 obj->yst_gid = attr->ia_gid;
7384 if (valid & ATTR_ATIME)
7385 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7386 if (valid & ATTR_CTIME)
7387 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7388 if (valid & ATTR_MTIME)
7389 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7391 if (valid & ATTR_SIZE)
7392 yaffs_ResizeFile(obj, attr->ia_size);
7394 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7399 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7401 unsigned int valid = 0;
7403 attr->ia_mode = obj->yst_mode;
7405 attr->ia_uid = obj->yst_uid;
7407 attr->ia_gid = obj->yst_gid;
7410 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7411 valid |= ATTR_ATIME;
7412 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7413 valid |= ATTR_CTIME;
7414 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7415 valid |= ATTR_MTIME;
7417 attr->ia_size = yaffs_GetFileSize(obj);
7420 attr->ia_valid = valid;
7428 int yaffs_DumpObject(yaffs_Object *obj)
7432 yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7434 T(YAFFS_TRACE_ALWAYS,
7436 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7437 " chunk %d type %d size %d\n"
7438 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7439 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7440 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7446 /*---------------------------- Initialisation code -------------------------------------- */
7448 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7451 /* Common functions, gotta have */
7452 if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
7455 #ifdef CONFIG_YAFFS_YAFFS2
7457 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7458 if (dev->param.writeChunkWithTagsToNAND &&
7459 dev->param.readChunkWithTagsFromNAND &&
7460 !dev->param.writeChunkToNAND &&
7461 !dev->param.readChunkFromNAND &&
7462 dev->param.markNANDBlockBad &&
7463 dev->param.queryNANDBlock)
7467 /* Can use the "spare" style interface for yaffs1 */
7468 if (!dev->param.isYaffs2 &&
7469 !dev->param.writeChunkWithTagsToNAND &&
7470 !dev->param.readChunkWithTagsFromNAND &&
7471 dev->param.writeChunkToNAND &&
7472 dev->param.readChunkFromNAND &&
7473 !dev->param.markNANDBlockBad &&
7474 !dev->param.queryNANDBlock)
7481 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7483 /* Initialise the unlinked, deleted, root and lost and found directories */
7485 dev->lostNFoundDir = dev->rootDir = NULL;
7486 dev->unlinkedDir = dev->deletedDir = NULL;
7489 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7492 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7495 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7496 YAFFS_ROOT_MODE | S_IFDIR);
7497 dev->lostNFoundDir =
7498 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7499 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7501 if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7502 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7509 int yaffs_GutsInitialise(yaffs_Device *dev)
7511 int init_failed = 0;
7515 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7517 /* Check stuff that must be set */
7520 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7524 dev->internalStartBlock = dev->param.startBlock;
7525 dev->internalEndBlock = dev->param.endBlock;
7526 dev->blockOffset = 0;
7527 dev->chunkOffset = 0;
7528 dev->nFreeChunks = 0;
7532 if (dev->param.startBlock == 0) {
7533 dev->internalStartBlock = dev->param.startBlock + 1;
7534 dev->internalEndBlock = dev->param.endBlock + 1;
7535 dev->blockOffset = 1;
7536 dev->chunkOffset = dev->param.nChunksPerBlock;
7539 /* Check geometry parameters. */
7541 if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
7542 (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
7543 (dev->param.inbandTags && !dev->param.isYaffs2) ||
7544 dev->param.nChunksPerBlock < 2 ||
7545 dev->param.nReservedBlocks < 2 ||
7546 dev->internalStartBlock <= 0 ||
7547 dev->internalEndBlock <= 0 ||
7548 dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) { /* otherwise it is too small */
7549 T(YAFFS_TRACE_ALWAYS,
7551 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7552 TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
7556 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7557 T(YAFFS_TRACE_ALWAYS,
7558 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7562 /* Sort out space for inband tags, if required */
7563 if (dev->param.inbandTags)
7564 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7566 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
7568 /* Got the right mix of functions? */
7569 if (!yaffs_CheckDevFunctions(dev)) {
7570 /* Function missing */
7571 T(YAFFS_TRACE_ALWAYS,
7573 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7578 /* This is really a compilation check. */
7579 if (!yaffs_CheckStructures()) {
7580 T(YAFFS_TRACE_ALWAYS,
7581 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7585 if (dev->isMounted) {
7586 T(YAFFS_TRACE_ALWAYS,
7587 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7591 /* Finished with most checks. One or two more checks happen later on too. */
7595 /* OK now calculate a few things for the device */
7598 * Calculate all the chunk size manipulation numbers:
7600 x = dev->nDataBytesPerChunk;
7601 /* We always use dev->chunkShift and dev->chunkDiv */
7602 dev->chunkShift = Shifts(x);
7603 x >>= dev->chunkShift;
7605 /* We only use chunk mask if chunkDiv is 1 */
7606 dev->chunkMask = (1<<dev->chunkShift) - 1;
7609 * Calculate chunkGroupBits.
7610 * We need to find the next power of 2 > than internalEndBlock
7613 x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
7617 /* Set up tnode width if wide tnodes are enabled. */
7618 if (!dev->param.wideTnodesDisabled) {
7619 /* bits must be even so that we end up with 32-bit words */
7623 dev->tnodeWidth = 16;
7625 dev->tnodeWidth = bits;
7627 dev->tnodeWidth = 16;
7629 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7631 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7632 * so if the bitwidth of the
7633 * chunk range we're using is greater than 16 we need
7634 * to figure out chunk shift and chunkGroupSize
7637 if (bits <= dev->tnodeWidth)
7638 dev->chunkGroupBits = 0;
7640 dev->chunkGroupBits = bits - dev->tnodeWidth;
7643 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7645 if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
7646 /* We have a problem because the soft delete won't work if
7647 * the chunk group size > chunks per block.
7648 * This can be remedied by using larger "virtual blocks".
7650 T(YAFFS_TRACE_ALWAYS,
7651 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7656 /* OK, we've finished verifying the device, lets continue with initialisation */
7658 /* More device initialisation */
7659 dev->garbageCollections = 0;
7660 dev->passiveGarbageCollections = 0;
7661 dev->currentDirtyChecker = 0;
7662 dev->bufferedBlock = -1;
7663 dev->doingBufferedBlockRewrite = 0;
7664 dev->nDeletedFiles = 0;
7665 dev->nBackgroundDeletions = 0;
7666 dev->nUnlinkedFiles = 0;
7668 dev->eccUnfixed = 0;
7669 dev->tagsEccFixed = 0;
7670 dev->tagsEccUnfixed = 0;
7671 dev->nErasureFailures = 0;
7672 dev->nErasedBlocks = 0;
7674 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7675 dev->oldestDirtySequence = 0;
7677 /* Initialise temporary buffers and caches. */
7678 if (!yaffs_InitialiseTempBuffers(dev))
7681 dev->srCache = NULL;
7682 dev->gcCleanupList = NULL;
7686 dev->param.nShortOpCaches > 0) {
7689 int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
7691 if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7692 dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7694 dev->srCache = YMALLOC(srCacheBytes);
7696 buf = (__u8 *) dev->srCache;
7699 memset(dev->srCache, 0, srCacheBytes);
7701 for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
7702 dev->srCache[i].object = NULL;
7703 dev->srCache[i].lastUse = 0;
7704 dev->srCache[i].dirty = 0;
7705 dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
7716 dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
7717 if (!dev->gcCleanupList)
7721 if (dev->param.isYaffs2)
7722 dev->param.useHeaderFileSize = 1;
7724 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7727 yaffs_InitialiseTnodes(dev);
7728 yaffs_InitialiseObjects(dev);
7730 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7735 /* Now scan the flash. */
7736 if (dev->param.isYaffs2) {
7737 if (yaffs_CheckpointRestore(dev)) {
7738 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7739 T(YAFFS_TRACE_ALWAYS,
7740 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7743 /* Clean up the mess caused by an aborted checkpoint load
7744 * and scan backwards.
7746 yaffs_DeinitialiseBlocks(dev);
7747 yaffs_DeinitialiseTnodes(dev);
7748 yaffs_DeinitialiseObjects(dev);
7751 dev->nErasedBlocks = 0;
7752 dev->nFreeChunks = 0;
7753 dev->allocationBlock = -1;
7754 dev->allocationPage = -1;
7755 dev->nDeletedFiles = 0;
7756 dev->nUnlinkedFiles = 0;
7757 dev->nBackgroundDeletions = 0;
7759 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7762 yaffs_InitialiseTnodes(dev);
7763 yaffs_InitialiseObjects(dev);
7765 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7768 if (!init_failed && !yaffs_ScanBackwards(dev))
7771 } else if (!yaffs_Scan(dev))
7774 yaffs_StripDeletedObjects(dev);
7775 yaffs_FixHangingObjects(dev);
7776 if(dev->param.emptyLostAndFound)
7777 yaffs_EmptyLostAndFound(dev);
7781 /* Clean up the mess */
7782 T(YAFFS_TRACE_TRACING,
7783 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7785 yaffs_Deinitialise(dev);
7789 /* Zero out stats */
7790 dev->nPageReads = 0;
7791 dev->nPageWrites = 0;
7792 dev->nBlockErasures = 0;
7794 dev->nRetriedWrites = 0;
7796 dev->nRetiredBlocks = 0;
7798 yaffs_VerifyFreeChunks(dev);
7799 yaffs_VerifyBlocks(dev);
7801 /* Clean up any aborted checkpoint data */
7802 if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
7803 yaffs_InvalidateCheckpoint(dev);
7805 T(YAFFS_TRACE_TRACING,
7806 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7811 void yaffs_Deinitialise(yaffs_Device *dev)
7813 if (dev->isMounted) {
7816 yaffs_DeinitialiseBlocks(dev);
7817 yaffs_DeinitialiseTnodes(dev);
7818 yaffs_DeinitialiseObjects(dev);
7819 if (dev->param.nShortOpCaches > 0 &&
7822 for (i = 0; i < dev->param.nShortOpCaches; i++) {
7823 if (dev->srCache[i].data)
7824 YFREE(dev->srCache[i].data);
7825 dev->srCache[i].data = NULL;
7828 YFREE(dev->srCache);
7829 dev->srCache = NULL;
7832 YFREE(dev->gcCleanupList);
7834 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7835 YFREE(dev->tempBuffer[i].buffer);
7839 if (dev->param.deinitialiseNAND)
7840 dev->param.deinitialiseNAND(dev);
7844 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7849 yaffs_BlockInfo *blk;
7851 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7853 blk = yaffs_GetBlockInfo(dev, b);
7855 switch (blk->blockState) {
7856 case YAFFS_BLOCK_STATE_EMPTY:
7857 case YAFFS_BLOCK_STATE_ALLOCATING:
7858 case YAFFS_BLOCK_STATE_COLLECTING:
7859 case YAFFS_BLOCK_STATE_FULL:
7861 (dev->param.nChunksPerBlock - blk->pagesInUse +
7862 blk->softDeletions);
7872 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7874 /* This is what we report to the outside world */
7877 int nDirtyCacheChunks;
7878 int blocksForCheckpoint;
7882 nFree = dev->nFreeChunks;
7884 nFree = yaffs_CountFreeChunks(dev);
7887 nFree += dev->nDeletedFiles;
7889 /* Now count the number of dirty chunks in the cache and subtract those */
7891 for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
7892 if (dev->srCache[i].dirty)
7893 nDirtyCacheChunks++;
7896 nFree -= nDirtyCacheChunks;
7898 nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
7900 /* Now we figure out how much to reserve for the checkpoint and report that... */
7901 blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7902 if (blocksForCheckpoint < 0)
7903 blocksForCheckpoint = 0;
7905 nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
7914 static int yaffs_freeVerificationFailures;
7916 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7921 if (yaffs_SkipVerification(dev))
7924 counted = yaffs_CountFreeChunks(dev);
7926 difference = dev->nFreeChunks - counted;
7929 T(YAFFS_TRACE_ALWAYS,
7930 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7931 dev->nFreeChunks, counted, difference));
7932 yaffs_freeVerificationFailures++;
7936 /*---------------------------------------- YAFFS test code ----------------------*/
7938 #define yaffs_CheckStruct(structure, syze, name) \
7940 if (sizeof(structure) != syze) { \
7941 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7942 name, syze, (int) sizeof(structure))); \
7943 return YAFFS_FAIL; \
7947 static int yaffs_CheckStructures(void)
7949 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7950 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7951 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7952 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7953 /* yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
7955 #ifndef CONFIG_YAFFS_WINCE
7956 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");