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 1.111 2010-03-02 02:29:21 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)
407 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
410 static int yaffs_SkipFullVerification(yaffs_Device *dev)
412 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
415 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
417 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
420 static const char *blockStateName[] = {
433 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
438 if (yaffs_SkipVerification(dev))
441 /* Report illegal runtime states */
442 if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
443 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
445 switch (bi->blockState) {
446 case YAFFS_BLOCK_STATE_UNKNOWN:
447 case YAFFS_BLOCK_STATE_SCANNING:
448 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
449 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
450 n, blockStateName[bi->blockState]));
453 /* Check pages in use and soft deletions are legal */
455 actuallyUsed = bi->pagesInUse - bi->softDeletions;
457 if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock ||
458 bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
459 actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock)
460 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
461 n, bi->pagesInUse, bi->softDeletions));
464 /* Check chunk bitmap legal */
465 inUse = yaffs_CountChunkBits(dev, n);
466 if (inUse != bi->pagesInUse)
467 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
468 n, bi->pagesInUse, inUse));
470 /* Check that the sequence number is valid.
471 * Ten million is legal, but is very unlikely
473 if (dev->param.isYaffs2 &&
474 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
475 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
476 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
477 n, bi->sequenceNumber));
480 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
483 yaffs_VerifyBlock(dev, bi, n);
485 /* After collection the block should be in the erased state */
486 /* This will need to change if we do partial gc */
488 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
489 bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
490 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
495 static void yaffs_VerifyBlocks(yaffs_Device *dev)
498 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
499 int nIllegalBlockStates = 0;
501 if (yaffs_SkipVerification(dev))
504 memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
506 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
507 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
508 yaffs_VerifyBlock(dev, bi, i);
510 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
511 nBlocksPerState[bi->blockState]++;
513 nIllegalBlockStates++;
516 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
517 T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
519 T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
520 if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
521 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
523 for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
524 T(YAFFS_TRACE_VERIFY,
525 (TSTR("%s %d blocks"TENDSTR),
526 blockStateName[i], nBlocksPerState[i]));
528 if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
529 T(YAFFS_TRACE_VERIFY,
530 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
531 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
533 if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
534 T(YAFFS_TRACE_VERIFY,
535 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
536 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
538 if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
539 T(YAFFS_TRACE_VERIFY,
540 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
541 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
543 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
548 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
549 * case those tests will not be performed.
551 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
553 if (obj && yaffs_SkipVerification(obj->myDev))
556 if (!(tags && obj && oh)) {
557 T(YAFFS_TRACE_VERIFY,
558 (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
563 if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
564 oh->type > YAFFS_OBJECT_TYPE_MAX)
565 T(YAFFS_TRACE_VERIFY,
566 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
567 tags->objectId, oh->type));
569 if (tags->objectId != obj->objectId)
570 T(YAFFS_TRACE_VERIFY,
571 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
572 tags->objectId, obj->objectId));
576 * Check that the object's parent ids match if parentCheck requested.
578 * Tests do not apply to the root object.
581 if (parentCheck && tags->objectId > 1 && !obj->parent)
582 T(YAFFS_TRACE_VERIFY,
583 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
584 tags->objectId, oh->parentObjectId));
586 if (parentCheck && obj->parent &&
587 oh->parentObjectId != obj->parent->objectId &&
588 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
589 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
590 T(YAFFS_TRACE_VERIFY,
591 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
592 tags->objectId, oh->parentObjectId, obj->parent->objectId));
594 if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
595 T(YAFFS_TRACE_VERIFY,
596 (TSTR("Obj %d header name is NULL"TENDSTR),
599 if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
600 T(YAFFS_TRACE_VERIFY,
601 (TSTR("Obj %d header name is 0xFF"TENDSTR),
607 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
608 __u32 level, int chunkOffset)
611 yaffs_Device *dev = obj->myDev;
617 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
618 if (tn->internal[i]) {
619 ok = yaffs_VerifyTnodeWorker(obj,
622 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
625 } else if (level == 0) {
626 yaffs_ExtendedTags tags;
627 __u32 objectId = obj->objectId;
629 chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
631 for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
632 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
635 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
636 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
637 if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
638 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
639 objectId, chunkOffset, theChunk,
640 tags.objectId, tags.chunkId));
653 static void yaffs_VerifyFile(yaffs_Object *obj)
655 int requiredTallness;
661 yaffs_ExtendedTags tags;
668 if (yaffs_SkipVerification(obj->myDev))
672 objectId = obj->objectId;
674 /* Check file size is consistent with tnode depth */
675 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
676 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
677 requiredTallness = 0;
679 x >>= YAFFS_TNODES_INTERNAL_BITS;
683 actualTallness = obj->variant.fileVariant.topLevel;
685 /* Check that the chunks in the tnode tree are all correct.
686 * We do this by scanning through the tnode tree and
687 * checking the tags for every chunk match.
690 if (yaffs_SkipNANDVerification(dev))
693 for (i = 1; i <= lastChunk; i++) {
694 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
697 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
699 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
700 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
701 if (tags.objectId != objectId || tags.chunkId != i) {
702 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
703 objectId, i, theChunk,
704 tags.objectId, tags.chunkId));
712 static void yaffs_VerifyHardLink(yaffs_Object *obj)
714 if (obj && yaffs_SkipVerification(obj->myDev))
717 /* Verify sane equivalent object */
720 static void yaffs_VerifySymlink(yaffs_Object *obj)
722 if (obj && yaffs_SkipVerification(obj->myDev))
725 /* Verify symlink string */
728 static void yaffs_VerifySpecial(yaffs_Object *obj)
730 if (obj && yaffs_SkipVerification(obj->myDev))
734 static void yaffs_VerifyObject(yaffs_Object *obj)
743 __u32 chunkShouldNotBeDeleted;
749 if (obj->beingCreated)
754 if (yaffs_SkipVerification(dev))
757 /* Check sane object header chunk */
759 chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
760 chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
762 chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
763 chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
764 chunkValid = chunkInRange &&
765 yaffs_CheckChunkBit(dev,
766 obj->hdrChunk / dev->param.nChunksPerBlock,
767 obj->hdrChunk % dev->param.nChunksPerBlock);
768 chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
771 (!chunkIdOk || chunkShouldNotBeDeleted)) {
772 T(YAFFS_TRACE_VERIFY,
773 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
774 obj->objectId, obj->hdrChunk,
775 chunkIdOk ? "" : ",out of range",
776 chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
779 if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
780 yaffs_ExtendedTags tags;
781 yaffs_ObjectHeader *oh;
782 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
784 oh = (yaffs_ObjectHeader *)buffer;
786 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
789 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
791 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
794 /* Verify it has a parent */
795 if (obj && !obj->fake &&
796 (!obj->parent || obj->parent->myDev != dev)) {
797 T(YAFFS_TRACE_VERIFY,
798 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
799 obj->objectId, obj->parent));
802 /* Verify parent is a directory */
803 if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
804 T(YAFFS_TRACE_VERIFY,
805 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
806 obj->objectId, obj->parent->variantType));
809 switch (obj->variantType) {
810 case YAFFS_OBJECT_TYPE_FILE:
811 yaffs_VerifyFile(obj);
813 case YAFFS_OBJECT_TYPE_SYMLINK:
814 yaffs_VerifySymlink(obj);
816 case YAFFS_OBJECT_TYPE_DIRECTORY:
817 yaffs_VerifyDirectory(obj);
819 case YAFFS_OBJECT_TYPE_HARDLINK:
820 yaffs_VerifyHardLink(obj);
822 case YAFFS_OBJECT_TYPE_SPECIAL:
823 yaffs_VerifySpecial(obj);
825 case YAFFS_OBJECT_TYPE_UNKNOWN:
827 T(YAFFS_TRACE_VERIFY,
828 (TSTR("Obj %d has illegaltype %d"TENDSTR),
829 obj->objectId, obj->variantType));
834 static void yaffs_VerifyObjects(yaffs_Device *dev)
838 struct ylist_head *lh;
840 if (yaffs_SkipVerification(dev))
843 /* Iterate through the objects in each hash entry */
845 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
846 ylist_for_each(lh, &dev->objectBucket[i].list) {
848 obj = ylist_entry(lh, yaffs_Object, hashLink);
849 yaffs_VerifyObject(obj);
857 * Simple hash function. Needs to have a reasonable spread
860 static Y_INLINE int yaffs_HashFunction(int n)
863 return n % YAFFS_NOBJECT_BUCKETS;
867 * Access functions to useful fake objects.
868 * Note that root might have a presence in NAND if permissions are set.
871 yaffs_Object *yaffs_Root(yaffs_Device *dev)
876 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
878 return dev->lostNFoundDir;
883 * Erased NAND checking functions
886 int yaffs_CheckFF(__u8 *buffer, int nBytes)
888 /* Horrible, slow implementation */
897 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
900 int retval = YAFFS_OK;
901 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
902 yaffs_ExtendedTags tags;
905 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
907 if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
910 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
911 T(YAFFS_TRACE_NANDACCESS,
912 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
916 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
923 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
926 yaffs_ExtendedTags *tags)
928 int retval = YAFFS_OK;
929 yaffs_ExtendedTags tempTags;
930 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
933 result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
934 if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
935 tempTags.objectId != tags->objectId ||
936 tempTags.chunkId != tags->chunkId ||
937 tempTags.byteCount != tags->byteCount)
940 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
945 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
947 yaffs_ExtendedTags *tags,
954 yaffs_InvalidateCheckpoint(dev);
957 yaffs_BlockInfo *bi = 0;
960 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
966 /* First check this chunk is erased, if it needs
967 * checking. The checking policy (unless forced
968 * always on) is as follows:
970 * Check the first page we try to write in a block.
971 * If the check passes then we don't need to check any
972 * more. If the check fails, we check again...
973 * If the block has been erased, we don't need to check.
975 * However, if the block has been prioritised for gc,
976 * then we think there might be something odd about
977 * this block and stop using it.
979 * Rationale: We should only ever see chunks that have
980 * not been erased if there was a partially written
981 * chunk due to power loss. This checking policy should
982 * catch that case with very few checks and thus save a
983 * lot of checks that are most likely not needed.
986 * If an erase check fails or the write fails we skip the
990 /* let's give it a try */
993 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
994 bi->skipErasedCheck = 0;
996 if (!bi->skipErasedCheck) {
997 erasedOk = yaffs_CheckChunkErased(dev, chunk);
998 if (erasedOk != YAFFS_OK) {
1000 (TSTR("**>> yaffs chunk %d was not erased"
1003 /* If not erased, delete this one,
1004 * skip rest of block and
1005 * try another chunk */
1006 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
1007 yaffs_SkipRestOfBlock(dev);
1012 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
1015 if(!bi->skipErasedCheck)
1016 writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
1018 if (writeOk != YAFFS_OK) {
1019 /* Clean up aborted write, skip to next block and
1020 * try another chunk */
1021 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
1025 bi->skipErasedCheck = 1;
1027 /* Copy the data into the robustification buffer */
1028 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
1030 } while (writeOk != YAFFS_OK &&
1031 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1037 T(YAFFS_TRACE_ERROR,
1038 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1041 dev->nRetriedWrites += (attempts - 1);
1048 * Block retiring for handling a broken block.
1051 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1053 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1055 yaffs_InvalidateCheckpoint(dev);
1057 if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1058 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1059 T(YAFFS_TRACE_ALWAYS, (TSTR(
1060 "yaffs: Failed to mark bad and erase block %d"
1061 TENDSTR), blockInNAND));
1063 yaffs_ExtendedTags tags;
1064 int chunkId = blockInNAND * dev->param.nChunksPerBlock;
1066 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1068 memset(buffer, 0xff, dev->nDataBytesPerChunk);
1069 yaffs_InitialiseTags(&tags);
1070 tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1071 if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
1072 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1073 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1074 TCONT("write bad block marker to block %d")
1075 TENDSTR), blockInNAND));
1077 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1081 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1082 bi->gcPrioritise = 0;
1083 bi->needsRetiring = 0;
1085 dev->nRetiredBlocks++;
1089 * Functions for robustisizing TODO
1093 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1095 const yaffs_ExtendedTags *tags)
1099 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1100 const yaffs_ExtendedTags *tags)
1104 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1106 if (!bi->gcPrioritise) {
1107 bi->gcPrioritise = 1;
1108 dev->hasPendingPrioritisedGCs = 1;
1109 bi->chunkErrorStrikes++;
1111 if (bi->chunkErrorStrikes > 3) {
1112 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1113 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1119 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1122 int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
1123 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1125 yaffs_HandleChunkError(dev, bi);
1128 /* Was an actual write failure, so mark the block for retirement */
1129 bi->needsRetiring = 1;
1130 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1131 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1134 /* Delete the chunk */
1135 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1136 yaffs_SkipRestOfBlock(dev);
1140 /*---------------- Name handling functions ------------*/
1142 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1147 const YUCHAR *bname = (const YUCHAR *) name;
1149 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1151 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1152 sum += yaffs_toupper(*bname) * i;
1154 sum += (*bname) * i;
1163 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1165 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1166 memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1167 if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
1168 yaffs_strcpy(obj->shortName, name);
1170 obj->shortName[0] = _Y('\0');
1172 obj->sum = yaffs_CalcNameSum(name);
1175 /*-------------------- TNODES -------------------
1177 * List of spare tnodes
1178 * The list is hooked together using the first pointer
1182 /* yaffs_CreateTnodes creates a bunch more tnodes and
1183 * adds them to the tnode free list.
1184 * Don't use this function directly
1186 static Y_INLINE int yaffs_CalcTnodeSize(yaffs_Device *dev)
1189 /* Calculate the tnode size in bytes for variable width tnode support.
1190 * Must be a multiple of 32-bits */
1191 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1193 if (tnodeSize < sizeof(yaffs_Tnode))
1194 tnodeSize = sizeof(yaffs_Tnode);
1198 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1201 int tnodeSize = yaffs_CalcTnodeSize(dev);
1202 yaffs_Tnode *newTnodes;
1206 yaffs_TnodeList *tnl;
1212 /* make these things */
1214 newTnodes = YMALLOC(nTnodes * tnodeSize);
1215 mem = (__u8 *)newTnodes;
1218 T(YAFFS_TRACE_ERROR,
1219 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1223 /* Hook them into the free list */
1225 for (i = 0; i < nTnodes - 1; i++) {
1226 newTnodes[i].internal[0] = &newTnodes[i + 1];
1227 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1228 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1232 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1233 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1234 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1236 dev->freeTnodes = newTnodes;
1238 /* New hookup for wide tnodes */
1239 for (i = 0; i < nTnodes - 1; i++) {
1240 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1241 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1242 curr->internal[0] = next;
1245 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1246 curr->internal[0] = dev->freeTnodes;
1247 dev->freeTnodes = (yaffs_Tnode *)mem;
1252 dev->nFreeTnodes += nTnodes;
1253 dev->nTnodesCreated += nTnodes;
1255 /* Now add this bunch of tnodes to a list for freeing up.
1256 * NB If we can't add this to the management list it isn't fatal
1257 * but it just means we can't free this bunch of tnodes later.
1260 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1262 T(YAFFS_TRACE_ERROR,
1264 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1267 tnl->tnodes = newTnodes;
1268 tnl->next = dev->allocatedTnodeList;
1269 dev->allocatedTnodeList = tnl;
1272 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1277 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1279 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1281 yaffs_Tnode *tn = NULL;
1283 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1284 tn = YMALLOC(yaffs_CalcTnodeSize(dev));
1286 dev->nTnodesCreated++;
1288 /* If there are none left make more */
1289 if (!dev->freeTnodes)
1290 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1292 if (dev->freeTnodes) {
1293 tn = dev->freeTnodes;
1294 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1295 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1296 /* Hoosterman, this thing looks like it isn't in the list */
1297 T(YAFFS_TRACE_ALWAYS,
1298 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1301 dev->freeTnodes = dev->freeTnodes->internal[0];
1305 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1310 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1312 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1313 int tnodeSize = yaffs_CalcTnodeSize(dev);
1316 memset(tn, 0, tnodeSize);
1321 /* FreeTnode frees up a tnode and puts it back on the free list */
1322 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1325 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1327 dev->nTnodesCreated--;
1329 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1330 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1331 /* Hoosterman, this thing looks like it is already in the list */
1332 T(YAFFS_TRACE_ALWAYS,
1333 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1335 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1337 tn->internal[0] = dev->freeTnodes;
1338 dev->freeTnodes = tn;
1342 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1345 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1347 /* Free the list of allocated tnodes */
1348 yaffs_TnodeList *tmp;
1350 while (dev->allocatedTnodeList) {
1351 tmp = dev->allocatedTnodeList->next;
1353 YFREE(dev->allocatedTnodeList->tnodes);
1354 YFREE(dev->allocatedTnodeList);
1355 dev->allocatedTnodeList = tmp;
1359 dev->freeTnodes = NULL;
1360 dev->nFreeTnodes = 0;
1361 dev->nTnodesCreated = 0;
1364 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1366 dev->allocatedTnodeList = NULL;
1367 dev->freeTnodes = NULL;
1368 dev->nFreeTnodes = 0;
1369 dev->nTnodesCreated = 0;
1373 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1376 __u32 *map = (__u32 *)tn;
1382 pos &= YAFFS_TNODES_LEVEL0_MASK;
1383 val >>= dev->chunkGroupBits;
1385 bitInMap = pos * dev->tnodeWidth;
1386 wordInMap = bitInMap / 32;
1387 bitInWord = bitInMap & (32 - 1);
1389 mask = dev->tnodeMask << bitInWord;
1391 map[wordInMap] &= ~mask;
1392 map[wordInMap] |= (mask & (val << bitInWord));
1394 if (dev->tnodeWidth > (32 - bitInWord)) {
1395 bitInWord = (32 - bitInWord);
1397 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1398 map[wordInMap] &= ~mask;
1399 map[wordInMap] |= (mask & (val >> bitInWord));
1403 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1406 __u32 *map = (__u32 *)tn;
1412 pos &= YAFFS_TNODES_LEVEL0_MASK;
1414 bitInMap = pos * dev->tnodeWidth;
1415 wordInMap = bitInMap / 32;
1416 bitInWord = bitInMap & (32 - 1);
1418 val = map[wordInMap] >> bitInWord;
1420 if (dev->tnodeWidth > (32 - bitInWord)) {
1421 bitInWord = (32 - bitInWord);
1423 val |= (map[wordInMap] << bitInWord);
1426 val &= dev->tnodeMask;
1427 val <<= dev->chunkGroupBits;
1432 /* ------------------- End of individual tnode manipulation -----------------*/
1434 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1435 * The look up tree is represented by the top tnode and the number of topLevel
1436 * in the tree. 0 means only the level 0 tnode is in the tree.
1439 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1440 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1441 yaffs_FileStructure *fStruct,
1444 yaffs_Tnode *tn = fStruct->top;
1446 int requiredTallness;
1447 int level = fStruct->topLevel;
1449 /* Check sane level and chunk Id */
1450 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1453 if (chunkId > YAFFS_MAX_CHUNK_ID)
1456 /* First check we're tall enough (ie enough topLevel) */
1458 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1459 requiredTallness = 0;
1461 i >>= YAFFS_TNODES_INTERNAL_BITS;
1465 if (requiredTallness > fStruct->topLevel)
1466 return NULL; /* Not tall enough, so we can't find it */
1468 /* Traverse down to level 0 */
1469 while (level > 0 && tn) {
1470 tn = tn->internal[(chunkId >>
1471 (YAFFS_TNODES_LEVEL0_BITS +
1473 YAFFS_TNODES_INTERNAL_BITS)) &
1474 YAFFS_TNODES_INTERNAL_MASK];
1481 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1482 * This happens in two steps:
1483 * 1. If the tree isn't tall enough, then make it taller.
1484 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1486 * Used when modifying the tree.
1488 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1489 * be plugged into the ttree.
1492 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1493 yaffs_FileStructure *fStruct,
1495 yaffs_Tnode *passedTn)
1497 int requiredTallness;
1505 /* Check sane level and page Id */
1506 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1509 if (chunkId > YAFFS_MAX_CHUNK_ID)
1512 /* First check we're tall enough (ie enough topLevel) */
1514 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1515 requiredTallness = 0;
1517 x >>= YAFFS_TNODES_INTERNAL_BITS;
1522 if (requiredTallness > fStruct->topLevel) {
1523 /* Not tall enough, gotta make the tree taller */
1524 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1526 tn = yaffs_GetTnode(dev);
1529 tn->internal[0] = fStruct->top;
1531 fStruct->topLevel++;
1533 T(YAFFS_TRACE_ERROR,
1534 (TSTR("yaffs: no more tnodes" TENDSTR)));
1540 /* Traverse down to level 0, adding anything we need */
1542 l = fStruct->topLevel;
1546 while (l > 0 && tn) {
1548 (YAFFS_TNODES_LEVEL0_BITS +
1549 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1550 YAFFS_TNODES_INTERNAL_MASK;
1553 if ((l > 1) && !tn->internal[x]) {
1554 /* Add missing non-level-zero tnode */
1555 tn->internal[x] = yaffs_GetTnode(dev);
1556 if(!tn->internal[x])
1558 } else if (l == 1) {
1559 /* Looking from level 1 at level 0 */
1561 /* If we already have one, then release it.*/
1562 if (tn->internal[x])
1563 yaffs_FreeTnode(dev, tn->internal[x]);
1564 tn->internal[x] = passedTn;
1566 } else if (!tn->internal[x]) {
1567 /* Don't have one, none passed in */
1568 tn->internal[x] = yaffs_GetTnode(dev);
1569 if(!tn->internal[x])
1574 tn = tn->internal[x];
1578 /* top is level 0 */
1580 memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1581 yaffs_FreeTnode(dev, passedTn);
1588 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1589 yaffs_ExtendedTags *tags, int objectId,
1594 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1595 if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
1596 theChunk % dev->param.nChunksPerBlock)) {
1598 if(dev->chunkGroupSize == 1)
1601 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1603 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1615 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1616 * chunks and tnodes in the file
1617 * Returns 1 if the tree was deleted.
1618 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1621 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1622 int chunkOffset, int *limit)
1627 yaffs_ExtendedTags tags;
1629 yaffs_Device *dev = in->myDev;
1635 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1637 if (tn->internal[i]) {
1638 if (limit && (*limit) < 0) {
1642 yaffs_DeleteWorker(in,
1650 YAFFS_TNODES_INTERNAL_BITS)
1655 yaffs_FreeTnode(dev,
1658 tn->internal[i] = NULL;
1662 return (allDone) ? 1 : 0;
1663 } else if (level == 0) {
1666 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1668 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1671 chunkInInode = (chunkOffset <<
1672 YAFFS_TNODES_LEVEL0_BITS) + i;
1675 yaffs_FindChunkInGroup(dev,
1681 if (foundChunk > 0) {
1682 yaffs_DeleteChunk(dev,
1687 *limit = *limit - 1;
1694 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1698 return (i < 0) ? 1 : 0;
1708 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1710 yaffs_BlockInfo *theBlock;
1712 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1714 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->param.nChunksPerBlock);
1716 theBlock->softDeletions++;
1721 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1722 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1724 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1727 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1728 __u32 level, int chunkOffset)
1733 yaffs_Device *dev = in->myDev;
1738 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1740 if (tn->internal[i]) {
1742 yaffs_SoftDeleteWorker(in,
1748 YAFFS_TNODES_INTERNAL_BITS)
1751 yaffs_FreeTnode(dev,
1754 tn->internal[i] = NULL;
1756 /* Hoosterman... how could this happen? */
1760 return (allDone) ? 1 : 0;
1761 } else if (level == 0) {
1763 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1764 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1766 /* Note this does not find the real chunk, only the chunk group.
1767 * We make an assumption that a chunk group is not larger than
1770 yaffs_SoftDeleteChunk(dev, theChunk);
1771 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1785 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1788 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1789 if (obj->nDataChunks <= 0) {
1790 /* Empty file with no duplicate object headers, just delete it immediately */
1791 yaffs_FreeTnode(obj->myDev,
1792 obj->variant.fileVariant.top);
1793 obj->variant.fileVariant.top = NULL;
1794 T(YAFFS_TRACE_TRACING,
1795 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1797 yaffs_DoGenericObjectDeletion(obj);
1799 yaffs_SoftDeleteWorker(obj,
1800 obj->variant.fileVariant.top,
1801 obj->variant.fileVariant.
1803 obj->softDeleted = 1;
1808 /* Pruning removes any part of the file structure tree that is beyond the
1809 * bounds of the file (ie that does not point to chunks).
1811 * A file should only get pruned when its size is reduced.
1813 * Before pruning, the chunks must be pulled from the tree and the
1814 * level 0 tnode entries must be zeroed out.
1815 * Could also use this for file deletion, but that's probably better handled
1816 * by a special case.
1818 * This function is recursive. For levels > 0 the function is called again on
1819 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1820 * If there is no data in a subtree then it is pruned.
1823 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1824 __u32 level, int del0)
1833 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1834 if (tn->internal[i]) {
1836 yaffs_PruneWorker(dev, tn->internal[i],
1838 (i == 0) ? del0 : 1);
1841 if (tn->internal[i])
1845 int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
1846 __u32 *map = (__u32 *)tn;
1848 for(i = 0; !hasData && i < tnodeSize_u32; i++){
1854 if (hasData == 0 && del0) {
1855 /* Free and return NULL */
1857 yaffs_FreeTnode(dev, tn);
1867 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1868 yaffs_FileStructure *fStruct)
1875 if (fStruct->topLevel > 0) {
1877 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1879 /* Now we have a tree with all the non-zero branches NULL but the height
1880 * is the same as it was.
1881 * Let's see if we can trim internal tnodes to shorten the tree.
1882 * We can do this if only the 0th element in the tnode is in use
1883 * (ie all the non-zero are NULL)
1886 while (fStruct->topLevel && !done) {
1890 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1891 if (tn->internal[i])
1896 fStruct->top = tn->internal[0];
1897 fStruct->topLevel--;
1898 yaffs_FreeTnode(dev, tn);
1908 /*-------------------- End of File Structure functions.-------------------*/
1910 /* yaffs_CreateFreeObjects creates a bunch more objects and
1911 * adds them to the object free list.
1913 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1916 yaffs_Object *newObjects;
1917 yaffs_ObjectList *list;
1922 /* make these things */
1923 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1924 list = YMALLOC(sizeof(yaffs_ObjectList));
1926 if (!newObjects || !list) {
1935 T(YAFFS_TRACE_ALLOCATE,
1936 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1940 /* Hook them into the free list */
1941 for (i = 0; i < nObjects - 1; i++) {
1942 newObjects[i].siblings.next =
1943 (struct ylist_head *)(&newObjects[i + 1]);
1946 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1947 dev->freeObjects = newObjects;
1948 dev->nFreeObjects += nObjects;
1949 dev->nObjectsCreated += nObjects;
1951 /* Now add this bunch of Objects to a list for freeing up. */
1953 list->objects = newObjects;
1954 list->next = dev->allocatedObjectList;
1955 dev->allocatedObjectList = list;
1961 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1962 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1964 yaffs_Object *tn = NULL;
1966 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1967 tn = YMALLOC(sizeof(yaffs_Object));
1969 dev->nObjectsCreated++;
1971 /* If there are none left make more */
1972 if (!dev->freeObjects)
1973 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1975 if (dev->freeObjects) {
1976 tn = dev->freeObjects;
1978 (yaffs_Object *) (dev->freeObjects->siblings.next);
1979 dev->nFreeObjects--;
1983 /* Now sweeten it up... */
1985 memset(tn, 0, sizeof(yaffs_Object));
1986 tn->beingCreated = 1;
1990 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1991 YINIT_LIST_HEAD(&(tn->hardLinks));
1992 YINIT_LIST_HEAD(&(tn->hashLink));
1993 YINIT_LIST_HEAD(&tn->siblings);
1996 /* Now make the directory sane */
1998 tn->parent = dev->rootDir;
1999 ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
2002 /* Add it to the lost and found directory.
2003 * NB Can't put root or lostNFound in lostNFound so
2004 * check if lostNFound exists first
2006 if (dev->lostNFoundDir)
2007 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
2009 tn->beingCreated = 0;
2012 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2017 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
2022 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
2024 obj->fake = 1; /* it is fake so it might have no NAND presence... */
2025 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
2026 obj->unlinkAllowed = 0; /* ... or unlink it */
2029 obj->yst_mode = mode;
2031 obj->hdrChunk = 0; /* Not a valid chunk. */
2038 static void yaffs_UnhashObject(yaffs_Object *tn)
2041 yaffs_Device *dev = tn->myDev;
2043 /* If it is still linked into the bucket list, free from the list */
2044 if (!ylist_empty(&tn->hashLink)) {
2045 ylist_del_init(&tn->hashLink);
2046 bucket = yaffs_HashFunction(tn->objectId);
2047 dev->objectBucket[bucket].count--;
2051 /* FreeObject frees up a Object and puts it back on the free list */
2052 static void yaffs_FreeObject(yaffs_Object *tn)
2054 yaffs_Device *dev = tn->myDev;
2056 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
2062 if (!ylist_empty(&tn->siblings))
2067 /* We're still hooked up to a cached inode.
2068 * Don't delete now, but mark for later deletion
2070 tn->deferedFree = 1;
2074 yaffs_UnhashObject(tn);
2076 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2078 dev->nObjectsCreated--;
2081 /* Link into the free list. */
2082 tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2083 dev->freeObjects = tn;
2084 dev->nFreeObjects++;
2086 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2090 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2092 if (obj->deferedFree)
2093 yaffs_FreeObject(obj);
2097 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2099 /* Free the list of allocated Objects */
2101 yaffs_ObjectList *tmp;
2103 while (dev->allocatedObjectList) {
2104 tmp = dev->allocatedObjectList->next;
2105 YFREE(dev->allocatedObjectList->objects);
2106 YFREE(dev->allocatedObjectList);
2108 dev->allocatedObjectList = tmp;
2111 dev->freeObjects = NULL;
2112 dev->nFreeObjects = 0;
2113 dev->nObjectsCreated = 0;
2116 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2120 dev->allocatedObjectList = NULL;
2121 dev->freeObjects = NULL;
2122 dev->nFreeObjects = 0;
2124 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2125 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2126 dev->objectBucket[i].count = 0;
2130 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2134 int lowest = 999999;
2137 /* Search for the shortest list or one that
2141 for (i = 0; i < 10 && lowest > 4; i++) {
2142 dev->bucketFinder++;
2143 dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
2144 if (dev->objectBucket[dev->bucketFinder].count < lowest) {
2145 lowest = dev->objectBucket[dev->bucketFinder].count;
2146 l = dev->bucketFinder;
2154 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2156 int bucket = yaffs_FindNiceObjectBucket(dev);
2158 /* Now find an object value that has not already been taken
2159 * by scanning the list.
2163 struct ylist_head *i;
2165 __u32 n = (__u32) bucket;
2167 /* yaffs_CheckObjectHashSanity(); */
2171 n += YAFFS_NOBJECT_BUCKETS;
2172 if (1 || dev->objectBucket[bucket].count > 0) {
2173 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2174 /* If there is already one in the list */
2175 if (i && ylist_entry(i, yaffs_Object,
2176 hashLink)->objectId == n) {
2186 static void yaffs_HashObject(yaffs_Object *in)
2188 int bucket = yaffs_HashFunction(in->objectId);
2189 yaffs_Device *dev = in->myDev;
2191 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2192 dev->objectBucket[bucket].count++;
2195 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2197 int bucket = yaffs_HashFunction(number);
2198 struct ylist_head *i;
2201 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2202 /* Look if it is in the list */
2204 in = ylist_entry(i, yaffs_Object, hashLink);
2205 if (in->objectId == number) {
2207 /* Don't tell the VFS about this one if it is defered free */
2208 if (in->deferedFree)
2219 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2220 yaffs_ObjectType type)
2222 yaffs_Object *theObject=NULL;
2223 yaffs_Tnode *tn = NULL;
2226 number = yaffs_CreateNewObjectNumber(dev);
2228 if (type == YAFFS_OBJECT_TYPE_FILE) {
2229 tn = yaffs_GetTnode(dev);
2234 theObject = yaffs_AllocateEmptyObject(dev);
2237 yaffs_FreeTnode(dev,tn);
2243 theObject->fake = 0;
2244 theObject->renameAllowed = 1;
2245 theObject->unlinkAllowed = 1;
2246 theObject->objectId = number;
2247 yaffs_HashObject(theObject);
2248 theObject->variantType = type;
2249 #ifdef CONFIG_YAFFS_WINCE
2250 yfsd_WinFileTimeNow(theObject->win_atime);
2251 theObject->win_ctime[0] = theObject->win_mtime[0] =
2252 theObject->win_atime[0];
2253 theObject->win_ctime[1] = theObject->win_mtime[1] =
2254 theObject->win_atime[1];
2258 theObject->yst_atime = theObject->yst_mtime =
2259 theObject->yst_ctime = Y_CURRENT_TIME;
2262 case YAFFS_OBJECT_TYPE_FILE:
2263 theObject->variant.fileVariant.fileSize = 0;
2264 theObject->variant.fileVariant.scannedFileSize = 0;
2265 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2266 theObject->variant.fileVariant.topLevel = 0;
2267 theObject->variant.fileVariant.top = tn;
2269 case YAFFS_OBJECT_TYPE_DIRECTORY:
2270 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2273 case YAFFS_OBJECT_TYPE_SYMLINK:
2274 case YAFFS_OBJECT_TYPE_HARDLINK:
2275 case YAFFS_OBJECT_TYPE_SPECIAL:
2276 /* No action required */
2278 case YAFFS_OBJECT_TYPE_UNKNOWN:
2279 /* todo this should not happen */
2287 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2289 yaffs_ObjectType type)
2291 yaffs_Object *theObject = NULL;
2294 theObject = yaffs_FindObjectByNumber(dev, number);
2297 theObject = yaffs_CreateNewObject(dev, number, type);
2304 static YCHAR *yaffs_CloneString(const YCHAR *str)
2306 YCHAR *newStr = NULL;
2312 len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
2313 newStr = YMALLOC((len + 1) * sizeof(YCHAR));
2315 yaffs_strncpy(newStr, str,len);
2323 * Mknod (create) a new object.
2324 * equivalentObject only has meaning for a hard link;
2325 * aliasString only has meaning for a symlink.
2326 * rdev only has meaning for devices (a subset of special objects)
2329 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2330 yaffs_Object *parent,
2335 yaffs_Object *equivalentObject,
2336 const YCHAR *aliasString, __u32 rdev)
2341 yaffs_Device *dev = parent->myDev;
2343 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2344 if (yaffs_FindObjectByName(parent, name))
2347 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2348 str = yaffs_CloneString(aliasString);
2353 in = yaffs_CreateNewObject(dev, -1, type);
2368 in->variantType = type;
2370 in->yst_mode = mode;
2372 #ifdef CONFIG_YAFFS_WINCE
2373 yfsd_WinFileTimeNow(in->win_atime);
2374 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2375 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2378 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2380 in->yst_rdev = rdev;
2384 in->nDataChunks = 0;
2386 yaffs_SetObjectName(in, name);
2389 yaffs_AddObjectToDirectory(parent, in);
2391 in->myDev = parent->myDev;
2394 case YAFFS_OBJECT_TYPE_SYMLINK:
2395 in->variant.symLinkVariant.alias = str;
2397 case YAFFS_OBJECT_TYPE_HARDLINK:
2398 in->variant.hardLinkVariant.equivalentObject =
2400 in->variant.hardLinkVariant.equivalentObjectId =
2401 equivalentObject->objectId;
2402 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2404 case YAFFS_OBJECT_TYPE_FILE:
2405 case YAFFS_OBJECT_TYPE_DIRECTORY:
2406 case YAFFS_OBJECT_TYPE_SPECIAL:
2407 case YAFFS_OBJECT_TYPE_UNKNOWN:
2412 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2413 /* Could not create the object header, fail the creation */
2414 yaffs_DeleteObject(in);
2418 yaffs_UpdateParent(parent);
2424 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2425 __u32 mode, __u32 uid, __u32 gid)
2427 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2428 uid, gid, NULL, NULL, 0);
2431 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2432 __u32 mode, __u32 uid, __u32 gid)
2434 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2435 mode, uid, gid, NULL, NULL, 0);
2438 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2439 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2441 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2442 uid, gid, NULL, NULL, rdev);
2445 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2446 __u32 mode, __u32 uid, __u32 gid,
2449 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2450 uid, gid, NULL, alias, 0);
2453 /* yaffs_Link returns the object id of the equivalent object.*/
2454 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2455 yaffs_Object *equivalentObject)
2457 /* Get the real object in case we were fed a hard link as an equivalent object */
2458 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2460 if (yaffs_MknodObject
2461 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2462 equivalentObject, NULL, 0)) {
2463 return equivalentObject;
2470 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2471 const YCHAR *newName, int force, int shadows)
2476 yaffs_Object *existingTarget;
2479 newDir = obj->parent; /* use the old directory */
2481 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2482 T(YAFFS_TRACE_ALWAYS,
2484 ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2489 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2490 if (obj->myDev->param.isYaffs2)
2491 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2493 unlinkOp = (newDir == obj->myDev->unlinkedDir
2494 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2496 deleteOp = (newDir == obj->myDev->deletedDir);
2498 existingTarget = yaffs_FindObjectByName(newDir, newName);
2500 /* If the object is a file going into the unlinked directory,
2501 * then it is OK to just stuff it in since duplicate names are allowed.
2502 * else only proceed if the new name does not exist and if we're putting
2503 * it into a directory.
2510 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2511 yaffs_SetObjectName(obj, newName);
2514 yaffs_AddObjectToDirectory(newDir, obj);
2519 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2520 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2527 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2528 yaffs_Object *newDir, const YCHAR *newName)
2530 yaffs_Object *obj = NULL;
2531 yaffs_Object *existingTarget = NULL;
2537 if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2539 if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2542 dev = oldDir->myDev;
2544 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2545 /* Special case for case insemsitive systems (eg. WinCE).
2546 * While look-up is case insensitive, the name isn't.
2547 * Therefore we might want to change x.txt to X.txt
2549 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2553 if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
2557 obj = yaffs_FindObjectByName(oldDir, oldName);
2559 if (obj && obj->renameAllowed) {
2561 /* Now do the handling for an existing target, if there is one */
2563 existingTarget = yaffs_FindObjectByName(newDir, newName);
2564 if (existingTarget &&
2565 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2566 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2567 /* There is a target that is a non-empty directory, so we fail */
2568 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2569 } else if (existingTarget && existingTarget != obj) {
2570 /* Nuke the target first, using shadowing,
2571 * but only if it isn't the same object.
2573 * Note we must disable gc otherwise it can mess up the shadowing.
2577 yaffs_ChangeObjectName(obj, newDir, newName, force,
2578 existingTarget->objectId);
2579 existingTarget->isShadowed = 1;
2580 yaffs_UnlinkObject(existingTarget);
2584 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2586 yaffs_UpdateParent(oldDir);
2587 if(newDir != oldDir)
2588 yaffs_UpdateParent(newDir);
2595 /*------------------------- Block Management and Page Allocation ----------------*/
2597 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2599 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2601 dev->blockInfo = NULL;
2602 dev->chunkBits = NULL;
2604 dev->allocationBlock = -1; /* force it to get a new one */
2606 /* If the first allocation strategy fails, thry the alternate one */
2607 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2608 if (!dev->blockInfo) {
2609 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2610 dev->blockInfoAlt = 1;
2612 dev->blockInfoAlt = 0;
2614 if (dev->blockInfo) {
2615 /* Set up dynamic blockinfo stuff. */
2616 dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
2617 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2618 if (!dev->chunkBits) {
2619 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2620 dev->chunkBitsAlt = 1;
2622 dev->chunkBitsAlt = 0;
2625 if (dev->blockInfo && dev->chunkBits) {
2626 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2627 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2634 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2636 if (dev->blockInfoAlt && dev->blockInfo)
2637 YFREE_ALT(dev->blockInfo);
2638 else if (dev->blockInfo)
2639 YFREE(dev->blockInfo);
2641 dev->blockInfoAlt = 0;
2643 dev->blockInfo = NULL;
2645 if (dev->chunkBitsAlt && dev->chunkBits)
2646 YFREE_ALT(dev->chunkBits);
2647 else if (dev->chunkBits)
2648 YFREE(dev->chunkBits);
2649 dev->chunkBitsAlt = 0;
2650 dev->chunkBits = NULL;
2653 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2654 yaffs_BlockInfo *bi)
2660 if (!dev->param.isYaffs2)
2661 return 1; /* disqualification only applies to yaffs2. */
2663 if (!bi->hasShrinkHeader)
2664 return 1; /* can gc */
2666 /* Find the oldest dirty sequence number if we don't know it and save it
2667 * so we don't have to keep recomputing it.
2669 if (!dev->oldestDirtySequence) {
2670 seq = dev->sequenceNumber;
2672 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2674 b = yaffs_GetBlockInfo(dev, i);
2675 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2676 (b->pagesInUse - b->softDeletions) <
2677 dev->param.nChunksPerBlock && b->sequenceNumber < seq) {
2678 seq = b->sequenceNumber;
2681 dev->oldestDirtySequence = seq;
2684 /* Can't do gc of this block if there are any blocks older than this one that have
2687 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2691 * yaffs_FindRefreshBlock()
2692 * periodically finds the oldest full block by sequence number for refreshing.
2695 static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev)
2700 __u32 oldestSequence = 0;
2702 yaffs_BlockInfo *bi;
2705 * If refresh period < 10 then refreshing is disabled.
2707 if(dev->param.refreshPeriod < 10 ||
2708 !dev->param.isYaffs2)
2712 * Fix broken values.
2714 if(dev->refreshSkip > dev->param.refreshPeriod)
2715 dev->refreshSkip = dev->param.refreshPeriod;
2717 if(dev->refreshSkip > 0){
2723 * Refresh skip is now zero.
2724 * We'll do a refresh this time around....
2725 * Update the refresh skip and find the oldest block.
2727 dev->refreshSkip = dev->param.refreshPeriod;
2728 dev->refreshCount++;
2730 for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
2732 bi = yaffs_GetBlockInfo(dev, b);
2735 if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
2738 bi->sequenceNumber < oldestSequence){
2740 oldestSequence = bi->sequenceNumber;
2747 (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
2748 dev->refreshCount, oldest, oldestSequence));
2755 * FindDiretiestBlock is used to select the dirtiest block (or close enough)
2756 * for garbage collection.
2759 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2762 int b = dev->currentDirtyChecker;
2768 int prioritised = 0;
2769 yaffs_BlockInfo *bi;
2770 int pendingPrioritisedExist = 0;
2772 /* First let's see if we need to grab a prioritised block */
2773 if (dev->hasPendingPrioritisedGCs) {
2774 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2776 bi = yaffs_GetBlockInfo(dev, i);
2777 /* yaffs_VerifyBlock(dev,bi,i); */
2779 if (bi->gcPrioritise) {
2780 pendingPrioritisedExist = 1;
2781 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2782 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2783 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2786 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2791 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2792 dev->hasPendingPrioritisedGCs = 0;
2795 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2797 * else (we're doing a leasurely gc), then we only bother to do this if the
2798 * block has only a few pages in use.
2801 dev->nonAggressiveSkip--;
2803 if (!aggressive && (dev->nonAggressiveSkip > 0))
2808 (aggressive) ? dev->param.nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2812 dev->internalEndBlock - dev->internalStartBlock + 1;
2815 dev->internalEndBlock - dev->internalStartBlock + 1;
2816 iterations = iterations / 16;
2817 if (iterations > 200)
2821 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2823 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2824 b = dev->internalStartBlock;
2826 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2827 T(YAFFS_TRACE_ERROR,
2828 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2832 bi = yaffs_GetBlockInfo(dev, b);
2834 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2835 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2836 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2838 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2842 dev->currentDirtyChecker = b;
2846 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2847 dev->param.nChunksPerBlock - pagesInUse, prioritised));
2850 dev->oldestDirtySequence = 0;
2853 dev->nonAggressiveSkip = 4;
2858 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2860 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2864 /* If the block is still healthy erase it and mark as clean.
2865 * If the block has had a data failure, then retire it.
2868 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2869 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2870 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2872 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2874 if (!bi->needsRetiring) {
2875 yaffs_InvalidateCheckpoint(dev);
2876 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2878 dev->nErasureFailures++;
2879 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2880 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2885 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2887 for (i = 0; i < dev->param.nChunksPerBlock; i++) {
2888 if (!yaffs_CheckChunkErased
2889 (dev, blockNo * dev->param.nChunksPerBlock + i)) {
2890 T(YAFFS_TRACE_ERROR,
2892 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2893 TENDSTR), blockNo, i));
2899 /* Clean it up... */
2900 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2901 bi->sequenceNumber = 0;
2902 dev->nErasedBlocks++;
2904 bi->softDeletions = 0;
2905 bi->hasShrinkHeader = 0;
2906 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2907 bi->gcPrioritise = 0;
2908 yaffs_ClearChunkBits(dev, blockNo);
2910 T(YAFFS_TRACE_ERASE,
2911 (TSTR("Erased block %d" TENDSTR), blockNo));
2913 dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
2915 yaffs_RetireBlock(dev, blockNo);
2916 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2917 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2921 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2925 yaffs_BlockInfo *bi;
2927 if (dev->nErasedBlocks < 1) {
2928 /* Hoosterman we've got a problem.
2929 * Can't get space to gc
2931 T(YAFFS_TRACE_ERROR,
2932 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2937 /* Find an empty block. */
2939 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2940 dev->allocationBlockFinder++;
2941 if (dev->allocationBlockFinder < dev->internalStartBlock
2942 || dev->allocationBlockFinder > dev->internalEndBlock) {
2943 dev->allocationBlockFinder = dev->internalStartBlock;
2946 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2948 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2949 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2950 dev->sequenceNumber++;
2951 bi->sequenceNumber = dev->sequenceNumber;
2952 dev->nErasedBlocks--;
2953 T(YAFFS_TRACE_ALLOCATE,
2954 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2955 dev->allocationBlockFinder, dev->sequenceNumber,
2956 dev->nErasedBlocks));
2957 return dev->allocationBlockFinder;
2961 T(YAFFS_TRACE_ALWAYS,
2963 ("yaffs tragedy: no more erased blocks, but there should have been %d"
2964 TENDSTR), dev->nErasedBlocks));
2971 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2973 if (!dev->nCheckpointBlocksRequired &&
2974 dev->param.isYaffs2) {
2975 /* Not a valid value so recalculate */
2978 int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
2979 int tnodeSize = yaffs_CalcTnodeSize(dev);
2981 nBytes += sizeof(yaffs_CheckpointValidity);
2982 nBytes += sizeof(yaffs_CheckpointDevice);
2983 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2984 nBytes += devBlocks * dev->chunkBitmapStride;
2985 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2986 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2987 nBytes += sizeof(yaffs_CheckpointValidity);
2988 nBytes += sizeof(__u32); /* checksum*/
2990 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2992 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
2994 dev->nCheckpointBlocksRequired = nBlocks;
2997 return dev->nCheckpointBlocksRequired;
3001 * Check if there's space to allocate...
3002 * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
3004 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
3007 int reservedBlocks = dev->param.nReservedBlocks;
3008 int checkpointBlocks;
3010 if (dev->param.isYaffs2) {
3011 checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) -
3012 dev->blocksInCheckpoint;
3013 if (checkpointBlocks < 0)
3014 checkpointBlocks = 0;
3016 checkpointBlocks = 0;
3019 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
3021 return (dev->nFreeChunks > reservedChunks);
3024 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
3025 yaffs_BlockInfo **blockUsedPtr)
3028 yaffs_BlockInfo *bi;
3030 if (dev->allocationBlock < 0) {
3031 /* Get next block to allocate off */
3032 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
3033 dev->allocationPage = 0;
3036 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
3037 /* Not enough space to allocate unless we're allowed to use the reserve. */
3041 if (dev->nErasedBlocks < dev->param.nReservedBlocks
3042 && dev->allocationPage == 0) {
3043 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
3046 /* Next page please.... */
3047 if (dev->allocationBlock >= 0) {
3048 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3050 retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
3051 dev->allocationPage;
3053 yaffs_SetChunkBit(dev, dev->allocationBlock,
3054 dev->allocationPage);
3056 dev->allocationPage++;
3060 /* If the block is full set the state to full */
3061 if (dev->allocationPage >= dev->param.nChunksPerBlock) {
3062 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3063 dev->allocationBlock = -1;
3072 T(YAFFS_TRACE_ERROR,
3073 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3078 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3082 n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3084 if (dev->allocationBlock > 0)
3085 n += (dev->param.nChunksPerBlock - dev->allocationPage);
3092 * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3093 * if we don't want to write to it.
3095 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3097 if(dev->allocationBlock > 0){
3098 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3099 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3100 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3101 dev->allocationBlock = -1;
3107 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3113 int retVal = YAFFS_OK;
3116 int isCheckpointBlock;
3120 int chunksBefore = yaffs_GetErasedChunks(dev);
3123 yaffs_ExtendedTags tags;
3125 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3127 yaffs_Object *object;
3129 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3132 T(YAFFS_TRACE_TRACING,
3133 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3136 bi->hasShrinkHeader,
3139 /*yaffs_VerifyFreeChunks(dev); */
3141 if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3142 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3144 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
3146 /* Take off the number of soft deleted entries because
3147 * they're going to get really deleted during GC.
3149 if(dev->gcChunk == 0) /* first time through for this block */
3150 dev->nFreeChunks -= bi->softDeletions;
3154 if (isCheckpointBlock ||
3155 !yaffs_StillSomeChunkBits(dev, block)) {
3156 T(YAFFS_TRACE_TRACING,
3158 ("Collecting block %d that has no chunks in use" TENDSTR),
3160 yaffs_BlockBecameDirty(dev, block);
3163 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3165 yaffs_VerifyBlock(dev, bi, block);
3167 maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 10;
3168 oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
3170 for (/* init already done */;
3171 retVal == YAFFS_OK &&
3172 dev->gcChunk < dev->param.nChunksPerBlock &&
3173 (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3175 dev->gcChunk++, oldChunk++) {
3176 if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3178 /* This page is in use and might need to be copied off */
3184 yaffs_InitialiseTags(&tags);
3186 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3190 yaffs_FindObjectByNumber(dev,
3193 T(YAFFS_TRACE_GC_DETAIL,
3195 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3196 dev->gcChunk, tags.objectId, tags.chunkId,
3199 if (object && !yaffs_SkipVerification(dev)) {
3200 if (tags.chunkId == 0)
3201 matchingChunk = object->hdrChunk;
3202 else if (object->softDeleted)
3203 matchingChunk = oldChunk; /* Defeat the test */
3205 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3207 if (oldChunk != matchingChunk)
3208 T(YAFFS_TRACE_ERROR,
3209 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3210 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3215 T(YAFFS_TRACE_ERROR,
3217 ("page %d in gc has no object: %d %d %d "
3219 tags.objectId, tags.chunkId, tags.byteCount));
3224 object->softDeleted &&
3225 tags.chunkId != 0) {
3226 /* Data chunk in a soft deleted file, throw it away
3227 * It's a soft deleted data chunk,
3228 * No need to copy this, just forget about it and
3229 * fix up the object.
3232 object->nDataChunks--;
3234 if (object->nDataChunks <= 0) {
3235 /* remeber to clean up the object */
3236 dev->gcCleanupList[cleanups] =
3242 /* Todo object && object->deleted && object->nDataChunks == 0 */
3243 /* Deleted object header with no data chunks.
3244 * Can be discarded and the file deleted.
3246 object->hdrChunk = 0;
3247 yaffs_FreeTnode(object->myDev,
3250 object->variant.fileVariant.top = NULL;
3251 yaffs_DoGenericObjectDeletion(object);
3253 } else if (object) {
3254 /* It's either a data chunk in a live file or
3255 * an ObjectHeader, so we're interested in it.
3256 * NB Need to keep the ObjectHeaders of deleted files
3257 * until the whole file has been deleted off
3259 tags.serialNumber++;
3263 if (tags.chunkId == 0) {
3264 /* It is an object Id,
3265 * We need to nuke the shrinkheader flags first
3266 * Also need to clean up shadowing.
3267 * We no longer want the shrinkHeader flag since its work is done
3268 * and if it is left in place it will mess up scanning.
3271 yaffs_ObjectHeader *oh;
3272 oh = (yaffs_ObjectHeader *)buffer;
3274 tags.extraIsShrinkHeader = 0;
3275 oh->shadowsObject = 0;
3276 oh->inbandShadowsObject = 0;
3277 if(object->variantType == YAFFS_OBJECT_TYPE_FILE)
3278 oh->fileSize = object->variant.fileVariant.fileSize;
3279 tags.extraShadows = 0;
3281 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3283 yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
3286 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3289 retVal = YAFFS_FAIL;
3292 /* Ok, now fix up the Tnodes etc. */
3294 if (tags.chunkId == 0) {
3296 object->hdrChunk = newChunk;
3297 object->serial = tags.serialNumber;
3299 /* It's a data chunk */
3301 ok = yaffs_PutChunkIntoFile
3309 if (retVal == YAFFS_OK)
3310 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3315 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3318 /* Do any required cleanups */
3319 for (i = 0; i < cleanups; i++) {
3320 /* Time to delete the file too */
3322 yaffs_FindObjectByNumber(dev,
3323 dev->gcCleanupList[i]);
3325 yaffs_FreeTnode(dev,
3326 object->variant.fileVariant.
3328 object->variant.fileVariant.top = NULL;
3331 ("yaffs: About to finally delete object %d"
3332 TENDSTR), object->objectId));
3333 yaffs_DoGenericObjectDeletion(object);
3334 object->myDev->nDeletedFiles--;
3341 yaffs_VerifyCollectedBlock(dev, bi, block);
3345 /* If the gc completed then clear the current gcBlock so that we find another. */
3346 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3347 chunksAfter = yaffs_GetErasedChunks(dev);
3348 if (chunksBefore >= chunksAfter) {
3351 ("gc did not increase free chunks before %d after %d"
3352 TENDSTR), chunksBefore, chunksAfter));
3363 /* New garbage collector
3364 * If we're very low on erased blocks then we do aggressive garbage collection
3365 * otherwise we do "leasurely" garbage collection.
3366 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3367 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3369 * The idea is to help clear out space in a more spread-out manner.
3370 * Dunno if it really does anything useful.
3372 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3376 int gcOk = YAFFS_OK;
3379 int checkpointBlockAdjust;
3381 if (dev->isDoingGC) {
3382 /* Bail out so we don't get recursive gc */
3386 /* This loop should pass the first time.
3387 * We'll only see looping here if the erase of the collected block fails.
3393 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3394 if (checkpointBlockAdjust < 0)
3395 checkpointBlockAdjust = 0;
3397 /* If we need a block soon then do aggressive gc.*/
3398 if (dev->nErasedBlocks < (dev->param.nReservedBlocks + checkpointBlockAdjust + 2))
3403 /* If we don't already have a block being gc'd then see if we should start another */
3405 if (dev->gcBlock < 1 && !aggressive) {
3406 dev->gcBlock = yaffs_FindRefreshBlock(dev);
3409 if (dev->gcBlock < 1) {
3410 dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3414 block = dev->gcBlock;
3417 dev->garbageCollections++;
3419 dev->passiveGarbageCollections++;
3423 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3424 dev->nErasedBlocks, aggressive));
3426 gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3429 if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && block > 0) {
3432 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3433 TENDSTR), dev->nErasedBlocks, maxTries, block));
3435 } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
3439 return aggressive ? gcOk : YAFFS_OK;
3442 /*------------------------- TAGS --------------------------------*/
3444 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3447 return (tags->chunkId == chunkInObject &&
3448 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3453 /*-------------------- Data file manipulation -----------------*/
3455 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3456 yaffs_ExtendedTags *tags)
3458 /*Get the Tnode, then get the level 0 offset chunk offset */
3461 yaffs_ExtendedTags localTags;
3464 yaffs_Device *dev = in->myDev;
3467 /* Passed a NULL, so use our own tags space */
3471 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3474 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3477 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3483 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3484 yaffs_ExtendedTags *tags)
3486 /* Get the Tnode, then get the level 0 offset chunk offset */
3489 yaffs_ExtendedTags localTags;
3491 yaffs_Device *dev = in->myDev;
3495 /* Passed a NULL, so use our own tags space */
3499 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3503 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3506 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3509 /* Delete the entry in the filestructure (if found) */
3511 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3517 #ifdef YAFFS_PARANOID
3519 static int yaffs_CheckFileSanity(yaffs_Object *in)
3527 yaffs_Tags localTags;
3528 yaffs_Tags *tags = &localTags;
3532 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3535 objId = in->objectId;
3536 fSize = in->variant.fileVariant.fileSize;
3538 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3540 for (chunk = 1; chunk <= nChunks; chunk++) {
3541 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3546 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3548 if (yaffs_CheckChunkBits
3549 (dev, theChunk / dev->param.nChunksPerBlock,
3550 theChunk % dev->param.nChunksPerBlock)) {
3552 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3556 (tags, in->objectId, chunk, chunkDeleted)) {
3566 /* T(("No level 0 found for %d\n", chunk)); */
3570 return failed ? YAFFS_FAIL : YAFFS_OK;
3575 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3576 int chunkInNAND, int inScan)
3578 /* NB inScan is zero unless scanning.
3579 * For forward scanning, inScan is > 0;
3580 * for backward scanning inScan is < 0
3582 * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3586 yaffs_Device *dev = in->myDev;
3588 yaffs_ExtendedTags existingTags;
3589 yaffs_ExtendedTags newTags;
3590 unsigned existingSerial, newSerial;
3592 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3593 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3594 * If it is not during Scanning then something went wrong!
3597 T(YAFFS_TRACE_ERROR,
3599 ("yaffs tragedy:attempt to put data chunk into a non-file"
3604 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3608 tn = yaffs_AddOrFindLevel0Tnode(dev,
3609 &in->variant.fileVariant,
3616 /* Dummy insert, bail now */
3619 existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3622 /* If we're scanning then we need to test for duplicates
3623 * NB This does not need to be efficient since it should only ever
3624 * happen when the power fails during a write, then only one
3625 * chunk should ever be affected.
3627 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3628 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3631 if (existingChunk > 0) {
3632 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3633 * thus we have to do a FindChunkInFile to get the real chunk id.
3635 * We have a duplicate now we need to decide which one to use:
3637 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3638 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3639 * YAFFS1: Get both sets of tags and compare serial numbers.
3643 /* Only do this for forward scanning */
3644 yaffs_ReadChunkWithTagsFromNAND(dev,
3648 /* Do a proper find */
3650 yaffs_FindChunkInFile(in, chunkInInode,
3654 if (existingChunk <= 0) {
3655 /*Hoosterman - how did this happen? */
3657 T(YAFFS_TRACE_ERROR,
3659 ("yaffs tragedy: existing chunk < 0 in scan"
3664 /* NB The deleted flags should be false, otherwise the chunks will
3665 * not be loaded during a scan
3669 newSerial = newTags.serialNumber;
3670 existingSerial = existingTags.serialNumber;
3674 (in->myDev->param.isYaffs2 ||
3675 existingChunk <= 0 ||
3676 ((existingSerial + 1) & 3) == newSerial)) {
3677 /* Forward scanning.
3679 * Delete the old one and drop through to update the tnode
3681 yaffs_DeleteChunk(dev, existingChunk, 1,
3684 /* Backward scanning or we want to use the existing one
3686 * Delete the new one and return early so that the tnode isn't changed
3688 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3696 if (existingChunk == 0)
3699 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3704 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3707 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3709 if (chunkInNAND >= 0)
3710 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3713 T(YAFFS_TRACE_NANDACCESS,
3714 (TSTR("Chunk %d not found zero instead" TENDSTR),
3716 /* get sane (zero) data if you read a hole */
3717 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3723 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3727 yaffs_ExtendedTags tags;
3728 yaffs_BlockInfo *bi;
3734 block = chunkId / dev->param.nChunksPerBlock;
3735 page = chunkId % dev->param.nChunksPerBlock;
3738 if (!yaffs_CheckChunkBit(dev, block, page))
3739 T(YAFFS_TRACE_VERIFY,
3740 (TSTR("Deleting invalid chunk %d"TENDSTR),
3743 bi = yaffs_GetBlockInfo(dev, block);
3745 T(YAFFS_TRACE_DELETION,
3746 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3749 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
3751 yaffs_InitialiseTags(&tags);
3753 tags.chunkDeleted = 1;
3755 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3756 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3758 dev->nUnmarkedDeletions++;
3761 /* Pull out of the management area.
3762 * If the whole block became dirty, this will kick off an erasure.
3764 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3765 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3766 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3767 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3770 yaffs_ClearChunkBit(dev, block, page);
3774 if (bi->pagesInUse == 0 &&
3775 !bi->hasShrinkHeader &&
3776 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3777 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3778 yaffs_BlockBecameDirty(dev, block);
3785 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3786 const __u8 *buffer, int nBytes,
3789 /* Find old chunk Need to do this to get serial number
3790 * Write new one and patch into tree.
3791 * Invalidate old tags.
3795 yaffs_ExtendedTags prevTags;
3798 yaffs_ExtendedTags newTags;
3800 yaffs_Device *dev = in->myDev;
3802 yaffs_CheckGarbageCollection(dev);
3804 /* Get the previous chunk at this location in the file if it exists.
3805 * If it does not exist then put a zero into the tree. This creates
3806 * the tnode now, rather than later when it is harder to clean up.
3808 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3809 if(prevChunkId < 1 &&
3810 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
3813 /* Set up new tags */
3814 yaffs_InitialiseTags(&newTags);
3816 newTags.chunkId = chunkInInode;
3817 newTags.objectId = in->objectId;
3818 newTags.serialNumber =
3819 (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3820 newTags.byteCount = nBytes;
3822 if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
3823 T(YAFFS_TRACE_ERROR,
3824 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3830 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3833 if (newChunkId > 0) {
3834 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3836 if (prevChunkId > 0)
3837 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3839 yaffs_CheckFileSanity(in);
3845 /* UpdateObjectHeader updates the header on NAND for an object.
3846 * If name is not NULL, then that new name is used.
3848 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3849 int isShrink, int shadows)
3852 yaffs_BlockInfo *bi;
3854 yaffs_Device *dev = in->myDev;
3861 yaffs_ExtendedTags newTags;
3862 yaffs_ExtendedTags oldTags;
3863 YCHAR *alias = NULL;
3865 __u8 *buffer = NULL;
3866 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3868 yaffs_ObjectHeader *oh = NULL;
3870 yaffs_strcpy(oldName, _Y("silly old name"));
3874 in == dev->rootDir || /* The rootDir should also be saved */
3877 yaffs_CheckGarbageCollection(dev);
3878 yaffs_CheckObjectDetailsLoaded(in);
3880 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3881 oh = (yaffs_ObjectHeader *) buffer;
3883 prevChunkId = in->hdrChunk;
3885 if (prevChunkId > 0) {
3886 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3889 yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3891 memcpy(oldName, oh->name, sizeof(oh->name));
3894 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3896 oh->type = in->variantType;
3897 oh->yst_mode = in->yst_mode;
3898 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3900 #ifdef CONFIG_YAFFS_WINCE
3901 oh->win_atime[0] = in->win_atime[0];
3902 oh->win_ctime[0] = in->win_ctime[0];
3903 oh->win_mtime[0] = in->win_mtime[0];
3904 oh->win_atime[1] = in->win_atime[1];
3905 oh->win_ctime[1] = in->win_ctime[1];
3906 oh->win_mtime[1] = in->win_mtime[1];
3908 oh->yst_uid = in->yst_uid;
3909 oh->yst_gid = in->yst_gid;
3910 oh->yst_atime = in->yst_atime;
3911 oh->yst_mtime = in->yst_mtime;
3912 oh->yst_ctime = in->yst_ctime;
3913 oh->yst_rdev = in->yst_rdev;
3916 oh->parentObjectId = in->parent->objectId;
3918 oh->parentObjectId = 0;
3920 if (name && *name) {
3921 memset(oh->name, 0, sizeof(oh->name));
3922 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3923 } else if (prevChunkId > 0)
3924 memcpy(oh->name, oldName, sizeof(oh->name));
3926 memset(oh->name, 0, sizeof(oh->name));
3928 oh->isShrink = isShrink;
3930 switch (in->variantType) {
3931 case YAFFS_OBJECT_TYPE_UNKNOWN:
3932 /* Should not happen */
3934 case YAFFS_OBJECT_TYPE_FILE:
3936 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3937 || oh->parentObjectId ==
3938 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3939 fileVariant.fileSize;
3941 case YAFFS_OBJECT_TYPE_HARDLINK:
3942 oh->equivalentObjectId =
3943 in->variant.hardLinkVariant.equivalentObjectId;
3945 case YAFFS_OBJECT_TYPE_SPECIAL:
3948 case YAFFS_OBJECT_TYPE_DIRECTORY:
3951 case YAFFS_OBJECT_TYPE_SYMLINK:
3952 alias = in->variant.symLinkVariant.alias;
3954 alias = _Y("no alias");
3955 yaffs_strncpy(oh->alias,
3957 YAFFS_MAX_ALIAS_LENGTH);
3958 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3963 yaffs_InitialiseTags(&newTags);
3965 newTags.chunkId = 0;
3966 newTags.objectId = in->objectId;
3967 newTags.serialNumber = in->serial;
3969 /* Add extra info for file header */
3971 newTags.extraHeaderInfoAvailable = 1;
3972 newTags.extraParentObjectId = oh->parentObjectId;
3973 newTags.extraFileLength = oh->fileSize;
3974 newTags.extraIsShrinkHeader = oh->isShrink;
3975 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3976 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3977 newTags.extraObjectType = in->variantType;
3979 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3981 /* Create new chunk in NAND */
3983 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3984 (prevChunkId > 0) ? 1 : 0);
3986 if (newChunkId >= 0) {
3988 in->hdrChunk = newChunkId;
3990 if (prevChunkId > 0) {
3991 yaffs_DeleteChunk(dev, prevChunkId, 1,
3995 if (!yaffs_ObjectHasCachedWriteData(in))
3998 /* If this was a shrink, then mark the block that the chunk lives on */
4000 bi = yaffs_GetBlockInfo(in->myDev,
4001 newChunkId / in->myDev->param.nChunksPerBlock);
4002 bi->hasShrinkHeader = 1;
4007 retVal = newChunkId;
4012 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
4017 /*------------------------ Short Operations Cache ----------------------------------------
4018 * In many situations where there is no high level buffering (eg WinCE) a lot of
4019 * reads might be short sequential reads, and a lot of writes may be short
4020 * sequential writes. eg. scanning/writing a jpeg file.
4021 * In these cases, a short read/write cache can provide a huge perfomance benefit
4022 * with dumb-as-a-rock code.
4023 * In Linux, the page cache provides read buffering aand the short op cache provides write
4026 * There are a limited number (~10) of cache chunks per device so that we don't
4027 * need a very intelligent search.
4030 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
4032 yaffs_Device *dev = obj->myDev;
4034 yaffs_ChunkCache *cache;
4035 int nCaches = obj->myDev->param.nShortOpCaches;
4037 for (i = 0; i < nCaches; i++) {
4038 cache = &dev->srCache[i];
4039 if (cache->object == obj &&
4048 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
4050 yaffs_Device *dev = obj->myDev;
4051 int lowest = -99; /* Stop compiler whining. */
4053 yaffs_ChunkCache *cache;
4054 int chunkWritten = 0;
4055 int nCaches = obj->myDev->param.nShortOpCaches;
4061 /* Find the dirty cache for this object with the lowest chunk id. */
4062 for (i = 0; i < nCaches; i++) {
4063 if (dev->srCache[i].object == obj &&
4064 dev->srCache[i].dirty) {
4066 || dev->srCache[i].chunkId <
4068 cache = &dev->srCache[i];
4069 lowest = cache->chunkId;
4074 if (cache && !cache->locked) {
4075 /* Write it out and free it up */
4078 yaffs_WriteChunkDataToObject(cache->object,
4084 cache->object = NULL;
4087 } while (cache && chunkWritten > 0);
4090 /* Hoosterman, disk full while writing cache out. */
4091 T(YAFFS_TRACE_ERROR,
4092 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4099 /*yaffs_FlushEntireDeviceCache(dev)
4104 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4107 int nCaches = dev->param.nShortOpCaches;
4110 /* Find a dirty object in the cache and flush it...
4111 * until there are no further dirty objects.
4115 for (i = 0; i < nCaches && !obj; i++) {
4116 if (dev->srCache[i].object &&
4117 dev->srCache[i].dirty)
4118 obj = dev->srCache[i].object;
4122 yaffs_FlushFilesChunkCache(obj);
4129 /* Grab us a cache chunk for use.
4130 * First look for an empty one.
4131 * Then look for the least recently used non-dirty one.
4132 * Then look for the least recently used dirty one...., flush and look again.
4134 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4138 if (dev->param.nShortOpCaches > 0) {
4139 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4140 if (!dev->srCache[i].object)
4141 return &dev->srCache[i];
4148 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4150 yaffs_ChunkCache *cache;
4151 yaffs_Object *theObj;
4156 if (dev->param.nShortOpCaches > 0) {
4157 /* Try find a non-dirty one... */
4159 cache = yaffs_GrabChunkCacheWorker(dev);
4162 /* They were all dirty, find the last recently used object and flush
4163 * its cache, then find again.
4164 * NB what's here is not very accurate, we actually flush the object
4165 * the last recently used page.
4168 /* With locking we can't assume we can use entry zero */
4175 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4176 if (dev->srCache[i].object &&
4177 !dev->srCache[i].locked &&
4178 (dev->srCache[i].lastUse < usage || !cache)) {
4179 usage = dev->srCache[i].lastUse;
4180 theObj = dev->srCache[i].object;
4181 cache = &dev->srCache[i];
4186 if (!cache || cache->dirty) {
4187 /* Flush and try again */
4188 yaffs_FlushFilesChunkCache(theObj);
4189 cache = yaffs_GrabChunkCacheWorker(dev);
4199 /* Find a cached chunk */
4200 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4203 yaffs_Device *dev = obj->myDev;
4205 if (dev->param.nShortOpCaches > 0) {
4206 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4207 if (dev->srCache[i].object == obj &&
4208 dev->srCache[i].chunkId == chunkId) {
4211 return &dev->srCache[i];
4218 /* Mark the chunk for the least recently used algorithym */
4219 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4223 if (dev->param.nShortOpCaches > 0) {
4224 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4225 /* Reset the cache usages */
4227 for (i = 1; i < dev->param.nShortOpCaches; i++)
4228 dev->srCache[i].lastUse = 0;
4235 cache->lastUse = dev->srLastUse;
4242 /* Invalidate a single cache page.
4243 * Do this when a whole page gets written,
4244 * ie the short cache for this page is no longer valid.
4246 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4248 if (object->myDev->param.nShortOpCaches > 0) {
4249 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4252 cache->object = NULL;
4256 /* Invalidate all the cache pages associated with this object
4257 * Do this whenever ther file is deleted or resized.
4259 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4262 yaffs_Device *dev = in->myDev;
4264 if (dev->param.nShortOpCaches > 0) {
4265 /* Invalidate it. */
4266 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4267 if (dev->srCache[i].object == in)
4268 dev->srCache[i].object = NULL;
4273 /*--------------------- Checkpointing --------------------*/
4276 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4278 yaffs_CheckpointValidity cp;
4280 memset(&cp, 0, sizeof(cp));
4282 cp.structType = sizeof(cp);
4283 cp.magic = YAFFS_MAGIC;
4284 cp.version = YAFFS_CHECKPOINT_VERSION;
4285 cp.head = (head) ? 1 : 0;
4287 return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4291 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4293 yaffs_CheckpointValidity cp;
4296 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4299 ok = (cp.structType == sizeof(cp)) &&
4300 (cp.magic == YAFFS_MAGIC) &&
4301 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4302 (cp.head == ((head) ? 1 : 0));
4306 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4309 cp->nErasedBlocks = dev->nErasedBlocks;
4310 cp->allocationBlock = dev->allocationBlock;
4311 cp->allocationPage = dev->allocationPage;
4312 cp->nFreeChunks = dev->nFreeChunks;
4314 cp->nDeletedFiles = dev->nDeletedFiles;
4315 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4316 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4317 cp->sequenceNumber = dev->sequenceNumber;
4318 cp->oldestDirtySequence = dev->oldestDirtySequence;
4322 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4323 yaffs_CheckpointDevice *cp)
4325 dev->nErasedBlocks = cp->nErasedBlocks;
4326 dev->allocationBlock = cp->allocationBlock;
4327 dev->allocationPage = cp->allocationPage;
4328 dev->nFreeChunks = cp->nFreeChunks;
4330 dev->nDeletedFiles = cp->nDeletedFiles;
4331 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4332 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4333 dev->sequenceNumber = cp->sequenceNumber;
4334 dev->oldestDirtySequence = cp->oldestDirtySequence;
4338 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4340 yaffs_CheckpointDevice cp;
4342 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4346 /* Write device runtime values*/
4347 yaffs_DeviceToCheckpointDevice(&cp, dev);
4348 cp.structType = sizeof(cp);
4350 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4352 /* Write block info */
4354 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4355 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4358 /* Write chunk bits */
4360 nBytes = nBlocks * dev->chunkBitmapStride;
4361 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4367 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4369 yaffs_CheckpointDevice cp;
4371 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4375 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4379 if (cp.structType != sizeof(cp))
4383 yaffs_CheckpointDeviceToDevice(dev, &cp);
4385 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4387 ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4391 nBytes = nBlocks * dev->chunkBitmapStride;
4393 ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4398 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4402 cp->objectId = obj->objectId;
4403 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4404 cp->hdrChunk = obj->hdrChunk;
4405 cp->variantType = obj->variantType;
4406 cp->deleted = obj->deleted;
4407 cp->softDeleted = obj->softDeleted;
4408 cp->unlinked = obj->unlinked;
4409 cp->fake = obj->fake;
4410 cp->renameAllowed = obj->renameAllowed;
4411 cp->unlinkAllowed = obj->unlinkAllowed;
4412 cp->serial = obj->serial;
4413 cp->nDataChunks = obj->nDataChunks;
4415 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4416 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4417 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4418 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4421 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4424 yaffs_Object *parent;
4426 if (obj->variantType != cp->variantType) {
4427 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4428 TCONT("chunk %d does not match existing object type %d")
4429 TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4434 obj->objectId = cp->objectId;
4437 parent = yaffs_FindOrCreateObjectByNumber(
4440 YAFFS_OBJECT_TYPE_DIRECTORY);
4445 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4446 T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4447 TCONT(" chunk %d Parent type, %d, not directory")
4449 cp->objectId, cp->parentId, cp->variantType,
4450 cp->hdrChunk, parent->variantType));
4453 yaffs_AddObjectToDirectory(parent, obj);
4456 obj->hdrChunk = cp->hdrChunk;
4457 obj->variantType = cp->variantType;
4458 obj->deleted = cp->deleted;
4459 obj->softDeleted = cp->softDeleted;
4460 obj->unlinked = cp->unlinked;
4461 obj->fake = cp->fake;
4462 obj->renameAllowed = cp->renameAllowed;
4463 obj->unlinkAllowed = cp->unlinkAllowed;
4464 obj->serial = cp->serial;
4465 obj->nDataChunks = cp->nDataChunks;
4467 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4468 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4469 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4470 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4472 if (obj->hdrChunk > 0)
4473 obj->lazyLoaded = 1;
4479 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4480 __u32 level, int chunkOffset)
4483 yaffs_Device *dev = in->myDev;
4485 int tnodeSize = yaffs_CalcTnodeSize(dev);
4490 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4491 if (tn->internal[i]) {
4492 ok = yaffs_CheckpointTnodeWorker(in,
4495 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4498 } else if (level == 0) {
4499 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4500 ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4502 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4510 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4512 __u32 endMarker = ~0;
4515 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4516 ok = yaffs_CheckpointTnodeWorker(obj,
4517 obj->variant.fileVariant.top,
4518 obj->variant.fileVariant.topLevel,
4521 ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4528 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4532 yaffs_Device *dev = obj->myDev;
4533 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4536 int tnodeSize = yaffs_CalcTnodeSize(dev);
4538 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4540 while (ok && (~baseChunk)) {
4542 /* Read level 0 tnode */
4545 tn = yaffs_GetTnodeRaw(dev);
4547 ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4552 ok = yaffs_AddOrFindLevel0Tnode(dev,
4558 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4562 T(YAFFS_TRACE_CHECKPOINT, (
4563 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4564 nread, baseChunk, ok));
4570 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4573 yaffs_CheckpointObject cp;
4576 struct ylist_head *lh;
4579 /* Iterate through the objects in each hash entry,
4580 * dumping them to the checkpointing stream.
4583 for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
4584 ylist_for_each(lh, &dev->objectBucket[i].list) {
4586 obj = ylist_entry(lh, yaffs_Object, hashLink);
4587 if (!obj->deferedFree) {
4588 yaffs_ObjectToCheckpointObject(&cp, obj);
4589 cp.structType = sizeof(cp);
4591 T(YAFFS_TRACE_CHECKPOINT, (
4592 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4593 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4595 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4597 if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4598 ok = yaffs_WriteCheckpointTnodes(obj);
4604 /* Dump end of list */
4605 memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4606 cp.structType = sizeof(cp);
4609 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4614 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4617 yaffs_CheckpointObject cp;
4620 yaffs_Object *hardList = NULL;
4622 while (ok && !done) {
4623 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4624 if (cp.structType != sizeof(cp)) {
4625 T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4626 cp.structType, (int)sizeof(cp), ok));
4630 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4631 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4633 if (ok && cp.objectId == ~0)
4636 obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4638 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4641 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4642 ok = yaffs_ReadCheckpointTnodes(obj);
4643 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4644 obj->hardLinks.next =
4645 (struct ylist_head *) hardList;
4654 yaffs_HardlinkFixup(dev, hardList);
4659 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4661 __u32 checkpointSum;
4664 yaffs_GetCheckpointSum(dev, &checkpointSum);
4666 ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4674 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4676 __u32 checkpointSum0;
4677 __u32 checkpointSum1;
4680 yaffs_GetCheckpointSum(dev, &checkpointSum0);
4682 ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4687 if (checkpointSum0 != checkpointSum1)
4694 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4698 if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
4699 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4704 ok = yaffs_CheckpointOpen(dev, 1);
4707 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4708 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4711 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4712 ok = yaffs_WriteCheckpointDevice(dev);
4715 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4716 ok = yaffs_WriteCheckpointObjects(dev);
4719 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4720 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4724 ok = yaffs_WriteCheckpointSum(dev);
4726 if (!yaffs_CheckpointClose(dev))
4730 dev->isCheckpointed = 1;
4732 dev->isCheckpointed = 0;
4734 return dev->isCheckpointed;
4737 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4741 if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) {
4742 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4747 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4750 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4751 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4754 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4755 ok = yaffs_ReadCheckpointDevice(dev);
4758 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4759 ok = yaffs_ReadCheckpointObjects(dev);
4762 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4763 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4767 ok = yaffs_ReadCheckpointSum(dev);
4768 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4771 if (!yaffs_CheckpointClose(dev))
4775 dev->isCheckpointed = 1;
4777 dev->isCheckpointed = 0;
4783 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4785 if (dev->isCheckpointed ||
4786 dev->blocksInCheckpoint > 0) {
4787 dev->isCheckpointed = 0;
4788 yaffs_CheckpointInvalidateStream(dev);
4789 if (dev->param.markSuperBlockDirty)
4790 dev->param.markSuperBlockDirty(dev);
4795 int yaffs_CheckpointSave(yaffs_Device *dev)
4798 T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4800 yaffs_VerifyObjects(dev);
4801 yaffs_VerifyBlocks(dev);
4802 yaffs_VerifyFreeChunks(dev);
4804 if (!dev->isCheckpointed) {
4805 yaffs_InvalidateCheckpoint(dev);
4806 yaffs_WriteCheckpointData(dev);
4809 T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4811 return dev->isCheckpointed;
4814 int yaffs_CheckpointRestore(yaffs_Device *dev)
4817 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4819 retval = yaffs_ReadCheckpointData(dev);
4821 if (dev->isCheckpointed) {
4822 yaffs_VerifyObjects(dev);
4823 yaffs_VerifyBlocks(dev);
4824 yaffs_VerifyFreeChunks(dev);
4827 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4832 /*--------------------- File read/write ------------------------
4833 * Read and write have very similar structures.
4834 * In general the read/write has three parts to it
4835 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4836 * Some complete chunks
4837 * An incomplete chunk to end off with
4839 * Curve-balls: the first chunk might also be the last chunk.
4842 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4851 yaffs_ChunkCache *cache;
4858 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4859 /* start = offset % dev->nDataBytesPerChunk; */
4860 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4863 /* OK now check for the curveball where the start and end are in
4866 if ((start + n) < dev->nDataBytesPerChunk)
4869 nToCopy = dev->nDataBytesPerChunk - start;
4871 cache = yaffs_FindChunkCache(in, chunk);
4873 /* If the chunk is already in the cache or it is less than a whole chunk
4874 * or we're using inband tags then use the cache (if there is caching)
4875 * else bypass the cache.
4877 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
4878 if (dev->param.nShortOpCaches > 0) {
4880 /* If we can't find the data in the cache, then load it up. */
4883 cache = yaffs_GrabChunkCache(in->myDev);
4885 cache->chunkId = chunk;
4888 yaffs_ReadChunkDataFromObject(in, chunk,
4894 yaffs_UseChunkCache(dev, cache, 0);
4899 memcpy(buffer, &cache->data[start], nToCopy);
4903 /* Read into the local buffer then copy..*/
4906 yaffs_GetTempBuffer(dev, __LINE__);
4907 yaffs_ReadChunkDataFromObject(in, chunk,
4910 memcpy(buffer, &localBuffer[start], nToCopy);
4913 yaffs_ReleaseTempBuffer(dev, localBuffer,
4919 /* A full chunk. Read directly into the supplied buffer. */
4920 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4934 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4935 int nBytes, int writeThrough)
4944 int startOfWrite = offset;
4945 int chunkWritten = 0;
4953 while (n > 0 && chunkWritten >= 0) {
4954 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4955 /* start = offset % dev->nDataBytesPerChunk; */
4956 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4958 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4959 start >= dev->nDataBytesPerChunk) {
4960 T(YAFFS_TRACE_ERROR, (
4961 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4963 (int)offset, chunk, start));
4967 /* OK now check for the curveball where the start and end are in
4971 if ((start + n) < dev->nDataBytesPerChunk) {
4974 /* Now folks, to calculate how many bytes to write back....
4975 * If we're overwriting and not writing to then end of file then
4976 * we need to write back as much as was there before.
4979 chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
4981 if (chunkStart > in->variant.fileVariant.fileSize)
4982 nBytesRead = 0; /* Past end of file */
4984 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
4986 if (nBytesRead > dev->nDataBytesPerChunk)
4987 nBytesRead = dev->nDataBytesPerChunk;
4991 (start + n)) ? nBytesRead : (start + n);
4993 if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
4997 nToCopy = dev->nDataBytesPerChunk - start;
4998 nToWriteBack = dev->nDataBytesPerChunk;
5001 if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5002 /* An incomplete start or end chunk (or maybe both start and end chunk),
5003 * or we're using inband tags, so we want to use the cache buffers.
5005 if (dev->param.nShortOpCaches > 0) {
5006 yaffs_ChunkCache *cache;
5007 /* If we can't find the data in the cache, then load the cache */
5008 cache = yaffs_FindChunkCache(in, chunk);
5011 && yaffs_CheckSpaceForAllocation(in->
5013 cache = yaffs_GrabChunkCache(in->myDev);
5015 cache->chunkId = chunk;
5018 yaffs_ReadChunkDataFromObject(in, chunk,
5023 !yaffs_CheckSpaceForAllocation(in->myDev)) {
5024 /* Drop the cache if it was a read cache item and
5025 * no space check has been made for it.
5031 yaffs_UseChunkCache(dev, cache, 1);
5035 memcpy(&cache->data[start], buffer,
5040 cache->nBytes = nToWriteBack;
5044 yaffs_WriteChunkDataToObject
5047 cache->data, cache->nBytes,
5053 chunkWritten = -1; /* fail the write */
5056 /* An incomplete start or end chunk (or maybe both start and end chunk)
5057 * Read into the local buffer then copy, then copy over and write back.
5061 yaffs_GetTempBuffer(dev, __LINE__);
5063 yaffs_ReadChunkDataFromObject(in, chunk,
5068 memcpy(&localBuffer[start], buffer, nToCopy);
5071 yaffs_WriteChunkDataToObject(in, chunk,
5076 yaffs_ReleaseTempBuffer(dev, localBuffer,
5082 /* A full chunk. Write directly from the supplied buffer. */
5087 yaffs_WriteChunkDataToObject(in, chunk, buffer,
5088 dev->nDataBytesPerChunk,
5091 /* Since we've overwritten the cached data, we better invalidate it. */
5092 yaffs_InvalidateChunkCache(in, chunk);
5095 if (chunkWritten >= 0) {
5104 /* Update file object */
5106 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5107 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5115 /* ---------------------- File resizing stuff ------------------ */
5117 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5120 yaffs_Device *dev = in->myDev;
5121 int oldFileSize = in->variant.fileVariant.fileSize;
5123 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5125 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5126 dev->nDataBytesPerChunk;
5130 /* Delete backwards so that we don't end up with holes if
5131 * power is lost part-way through the operation.
5133 for (i = lastDel; i >= startDel; i--) {
5134 /* NB this could be optimised somewhat,
5135 * eg. could retrieve the tags and write them without
5136 * using yaffs_DeleteChunk
5139 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5142 (dev->internalStartBlock * dev->param.nChunksPerBlock)
5144 ((dev->internalEndBlock +
5145 1) * dev->param.nChunksPerBlock)) {
5146 T(YAFFS_TRACE_ALWAYS,
5147 (TSTR("Found daft chunkId %d for %d" TENDSTR),
5151 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5158 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5161 int oldFileSize = in->variant.fileVariant.fileSize;
5162 __u32 newSizeOfPartialChunk;
5165 yaffs_Device *dev = in->myDev;
5167 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5169 yaffs_FlushFilesChunkCache(in);
5170 yaffs_InvalidateWholeChunkCache(in);
5172 yaffs_CheckGarbageCollection(dev);
5174 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5177 if (newSize == oldFileSize)
5180 if (newSize < oldFileSize) {
5182 yaffs_PruneResizedChunks(in, newSize);
5184 if (newSizeOfPartialChunk != 0) {
5185 int lastChunk = 1 + newFullChunks;
5187 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5189 /* Got to read and rewrite the last chunk with its new size and zero pad */
5190 yaffs_ReadChunkDataFromObject(in, lastChunk,
5193 memset(localBuffer + newSizeOfPartialChunk, 0,
5194 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5196 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5197 newSizeOfPartialChunk, 1);
5199 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5202 in->variant.fileVariant.fileSize = newSize;
5204 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5206 /* newsSize > oldFileSize */
5207 in->variant.fileVariant.fileSize = newSize;
5211 /* Write a new object header to reflect the resize.
5212 * show we've shrunk the file, if need be
5213 * Do this only if the file is not in the deleted directories
5214 * and is not shadowed.
5218 in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5219 in->parent->objectId != YAFFS_OBJECTID_DELETED)
5220 yaffs_UpdateObjectHeader(in, NULL, 0,
5221 (newSize < oldFileSize) ? 1 : 0, 0);
5226 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5228 YCHAR *alias = NULL;
5229 obj = yaffs_GetEquivalentObject(obj);
5231 switch (obj->variantType) {
5232 case YAFFS_OBJECT_TYPE_FILE:
5233 return obj->variant.fileVariant.fileSize;
5234 case YAFFS_OBJECT_TYPE_SYMLINK:
5235 alias = obj->variant.symLinkVariant.alias;
5238 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5246 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5250 yaffs_FlushFilesChunkCache(in);
5251 if(dataSync) /* Only sync data */
5255 #ifdef CONFIG_YAFFS_WINCE
5256 yfsd_WinFileTimeNow(in->win_mtime);
5259 in->yst_mtime = Y_CURRENT_TIME;
5264 retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5265 0) ? YAFFS_OK : YAFFS_FAIL;
5275 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5278 /* First off, invalidate the file's data in the cache, without flushing. */
5279 yaffs_InvalidateWholeChunkCache(in);
5281 if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5282 /* Move to the unlinked directory so we have a record that it was deleted. */
5283 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5287 yaffs_RemoveObjectFromDirectory(in);
5288 yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5291 yaffs_FreeObject(in);
5296 /* yaffs_DeleteFile deletes the whole file data
5297 * and the inode associated with the file.
5298 * It does not delete the links associated with the file.
5300 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5304 int immediateDeletion = 0;
5307 immediateDeletion = 1;
5309 if (immediateDeletion) {
5311 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5312 _Y("deleted"), 0, 0);
5313 T(YAFFS_TRACE_TRACING,
5314 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5317 in->myDev->nDeletedFiles++;
5318 if (1 || in->myDev->param.isYaffs2)
5319 yaffs_ResizeFile(in, 0);
5320 yaffs_SoftDeleteFile(in);
5323 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5324 _Y("unlinked"), 0, 0);
5331 int yaffs_DeleteFile(yaffs_Object *in)
5333 int retVal = YAFFS_OK;
5334 int deleted = in->deleted;
5336 yaffs_ResizeFile(in, 0);
5338 if (in->nDataChunks > 0) {
5339 /* Use soft deletion if there is data in the file.
5340 * That won't be the case if it has been resized to zero.
5343 retVal = yaffs_UnlinkFileIfNeeded(in);
5345 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5348 in->myDev->nDeletedFiles++;
5349 yaffs_SoftDeleteFile(in);
5351 return deleted ? YAFFS_OK : YAFFS_FAIL;
5353 /* The file has no data chunks so we toss it immediately */
5354 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5355 in->variant.fileVariant.top = NULL;
5356 yaffs_DoGenericObjectDeletion(in);
5362 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5364 return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5365 !(ylist_empty(&obj->variant.directoryVariant.children));
5368 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5370 /* First check that the directory is empty. */
5371 if (yaffs_IsNonEmptyDirectory(obj))
5374 return yaffs_DoGenericObjectDeletion(obj);
5377 static int yaffs_DeleteSymLink(yaffs_Object *in)
5379 if(in->variant.symLinkVariant.alias)
5380 YFREE(in->variant.symLinkVariant.alias);
5381 in->variant.symLinkVariant.alias=NULL;
5383 return yaffs_DoGenericObjectDeletion(in);
5386 static int yaffs_DeleteHardLink(yaffs_Object *in)
5388 /* remove this hardlink from the list assocaited with the equivalent
5391 ylist_del_init(&in->hardLinks);
5392 return yaffs_DoGenericObjectDeletion(in);
5395 int yaffs_DeleteObject(yaffs_Object *obj)
5398 switch (obj->variantType) {
5399 case YAFFS_OBJECT_TYPE_FILE:
5400 retVal = yaffs_DeleteFile(obj);
5402 case YAFFS_OBJECT_TYPE_DIRECTORY:
5403 return yaffs_DeleteDirectory(obj);
5405 case YAFFS_OBJECT_TYPE_SYMLINK:
5406 retVal = yaffs_DeleteSymLink(obj);
5408 case YAFFS_OBJECT_TYPE_HARDLINK:
5409 retVal = yaffs_DeleteHardLink(obj);
5411 case YAFFS_OBJECT_TYPE_SPECIAL:
5412 retVal = yaffs_DoGenericObjectDeletion(obj);
5414 case YAFFS_OBJECT_TYPE_UNKNOWN:
5416 break; /* should not happen. */
5422 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5425 int immediateDeletion = 0;
5428 immediateDeletion = 1;
5431 yaffs_UpdateParent(obj->parent);
5433 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5434 return yaffs_DeleteHardLink(obj);
5435 } else if (!ylist_empty(&obj->hardLinks)) {
5436 /* Curve ball: We're unlinking an object that has a hardlink.
5438 * This problem arises because we are not strictly following
5439 * The Linux link/inode model.
5441 * We can't really delete the object.
5442 * Instead, we do the following:
5443 * - Select a hardlink.
5444 * - Unhook it from the hard links
5445 * - Move it from its parent directory (so that the rename can work)
5446 * - Rename the object to the hardlink's name.
5447 * - Delete the hardlink
5451 yaffs_Object *parent;
5453 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5455 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5457 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5458 parent = hl->parent;
5460 ylist_del_init(&hl->hardLinks);
5462 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5464 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5466 if (retVal == YAFFS_OK)
5467 retVal = yaffs_DoGenericObjectDeletion(hl);
5471 } else if (immediateDeletion) {
5472 switch (obj->variantType) {
5473 case YAFFS_OBJECT_TYPE_FILE:
5474 return yaffs_DeleteFile(obj);
5476 case YAFFS_OBJECT_TYPE_DIRECTORY:
5477 return yaffs_DeleteDirectory(obj);
5479 case YAFFS_OBJECT_TYPE_SYMLINK:
5480 return yaffs_DeleteSymLink(obj);
5482 case YAFFS_OBJECT_TYPE_SPECIAL:
5483 return yaffs_DoGenericObjectDeletion(obj);
5485 case YAFFS_OBJECT_TYPE_HARDLINK:
5486 case YAFFS_OBJECT_TYPE_UNKNOWN:
5490 } else if(yaffs_IsNonEmptyDirectory(obj))
5493 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5494 _Y("unlinked"), 0, 0);
5498 static int yaffs_UnlinkObject(yaffs_Object *obj)
5501 if (obj && obj->unlinkAllowed)
5502 return yaffs_UnlinkWorker(obj);
5507 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5511 obj = yaffs_FindObjectByName(dir, name);
5512 return yaffs_UnlinkObject(obj);
5515 /*----------------------- Initialisation Scanning ---------------------- */
5517 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5518 int backwardScanning)
5522 if (!backwardScanning) {
5523 /* Handle YAFFS1 forward scanning case
5524 * For YAFFS1 we always do the deletion
5528 /* Handle YAFFS2 case (backward scanning)
5529 * If the shadowed object exists then ignore.
5531 obj = yaffs_FindObjectByNumber(dev, objId);
5536 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5537 * We put it in unlinked dir to be cleaned up after the scanning
5540 yaffs_FindOrCreateObjectByNumber(dev, objId,
5541 YAFFS_OBJECT_TYPE_FILE);
5544 obj->isShadowed = 1;
5545 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5546 obj->variant.fileVariant.shrinkSize = 0;
5547 obj->valid = 1; /* So that we don't read any other info for this file */
5557 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5564 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5566 in = yaffs_FindObjectByNumber(dev,
5567 hl->variant.hardLinkVariant.
5568 equivalentObjectId);
5571 /* Add the hardlink pointers */
5572 hl->variant.hardLinkVariant.equivalentObject = in;
5573 ylist_add(&hl->hardLinks, &in->hardLinks);
5575 /* Todo Need to report/handle this better.
5576 * Got a problem... hardlink to a non-existant object
5578 hl->variant.hardLinkVariant.equivalentObject = NULL;
5579 YINIT_LIST_HEAD(&hl->hardLinks);
5589 static int ybicmp(const void *a, const void *b)
5591 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5592 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5593 register int ablock = ((yaffs_BlockIndex *)a)->block;
5594 register int bblock = ((yaffs_BlockIndex *)b)->block;
5596 return ablock - bblock;
5602 struct yaffs_ShadowFixerStruct {
5605 struct yaffs_ShadowFixerStruct *next;
5609 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5612 * Sort out state of unlinked and deleted objects after scanning.
5614 struct ylist_head *i;
5615 struct ylist_head *n;
5618 /* Soft delete all the unlinked files */
5619 ylist_for_each_safe(i, n,
5620 &dev->unlinkedDir->variant.directoryVariant.children) {
5622 l = ylist_entry(i, yaffs_Object, siblings);
5623 yaffs_DeleteObject(l);
5627 ylist_for_each_safe(i, n,
5628 &dev->deletedDir->variant.directoryVariant.children) {
5630 l = ylist_entry(i, yaffs_Object, siblings);
5631 yaffs_DeleteObject(l);
5638 * This code iterates through all the objects making sure that they are rooted.
5639 * Any unrooted objects are re-rooted in lost+found.
5640 * An object needs to be in one of:
5641 * - Directly under deleted, unlinked
5642 * - Directly or indirectly under root.
5645 * This code assumes that we don't ever change the current relationships between
5647 * rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5648 * lostNfound->parent == rootDir
5650 * This fixes the problem where directories might have inadvertently been deleted
5651 * leaving the object "hanging" without being rooted in the directory tree.
5654 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5656 return (obj == dev->deletedDir ||
5657 obj == dev->unlinkedDir||
5658 obj == dev->rootDir);
5661 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5664 yaffs_Object *parent;
5666 struct ylist_head *lh;
5667 struct ylist_head *n;
5672 /* Iterate through the objects in each hash entry,
5673 * looking at each object.
5674 * Make sure it is rooted.
5677 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
5678 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5680 obj = ylist_entry(lh, yaffs_Object, hashLink);
5681 parent= obj->parent;
5683 if(yaffs_HasNULLParent(dev,obj)){
5684 /* These directories are not hanging */
5687 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5689 else if(yaffs_HasNULLParent(dev,parent))
5693 * Need to follow the parent chain to see if it is hanging.
5698 while(parent != dev->rootDir &&
5700 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5702 parent = parent->parent;
5705 if(parent != dev->rootDir)
5710 (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5712 yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5721 * Delete directory contents for cleaning up lost and found.
5723 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
5726 struct ylist_head *lh;
5727 struct ylist_head *n;
5729 if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5732 ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
5734 obj = ylist_entry(lh, yaffs_Object, siblings);
5735 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
5736 yaffs_DeleteDirectoryContents(obj);
5739 (TSTR("Deleting lost_found object %d" TENDSTR),
5742 /* Need to use UnlinkObject since Delete would not handle
5743 * hardlinked objects correctly.
5745 yaffs_UnlinkObject(obj);
5751 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
5753 yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
5756 static int yaffs_Scan(yaffs_Device *dev)
5758 yaffs_ExtendedTags tags;
5768 yaffs_BlockState state;
5769 yaffs_Object *hardList = NULL;
5770 yaffs_BlockInfo *bi;
5771 __u32 sequenceNumber;
5772 yaffs_ObjectHeader *oh;
5774 yaffs_Object *parent;
5776 int alloc_failed = 0;
5778 struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5786 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5787 dev->internalStartBlock, dev->internalEndBlock));
5789 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5791 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5793 /* Scan all the blocks to determine their state */
5794 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5795 bi = yaffs_GetBlockInfo(dev, blk);
5796 yaffs_ClearChunkBits(dev, blk);
5798 bi->softDeletions = 0;
5800 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5802 bi->blockState = state;
5803 bi->sequenceNumber = sequenceNumber;
5805 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5806 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5808 T(YAFFS_TRACE_SCAN_DEBUG,
5809 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5810 state, sequenceNumber));
5812 if (state == YAFFS_BLOCK_STATE_DEAD) {
5813 T(YAFFS_TRACE_BAD_BLOCKS,
5814 (TSTR("block %d is bad" TENDSTR), blk));
5815 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5816 T(YAFFS_TRACE_SCAN_DEBUG,
5817 (TSTR("Block empty " TENDSTR)));
5818 dev->nErasedBlocks++;
5819 dev->nFreeChunks += dev->param.nChunksPerBlock;
5823 startIterator = dev->internalStartBlock;
5824 endIterator = dev->internalEndBlock;
5826 /* For each block.... */
5827 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5834 blk = blockIterator;
5836 bi = yaffs_GetBlockInfo(dev, blk);
5837 state = bi->blockState;
5841 /* For each chunk in each block that needs scanning....*/
5842 for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
5843 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5844 /* Read the tags and decide what to do */
5845 chunk = blk * dev->param.nChunksPerBlock + c;
5847 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5850 /* Let's have a good look at this chunk... */
5852 if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5858 /*T((" %d %d deleted\n",blk,c)); */
5859 } else if (!tags.chunkUsed) {
5860 /* An unassigned chunk in the block
5861 * This means that either the block is empty or
5862 * this is the one being allocated from
5866 /* We're looking at the first chunk in the block so the block is unused */
5867 state = YAFFS_BLOCK_STATE_EMPTY;
5868 dev->nErasedBlocks++;
5870 /* this is the block being allocated from */
5873 (" Allocating from %d %d" TENDSTR),
5875 state = YAFFS_BLOCK_STATE_ALLOCATING;
5876 dev->allocationBlock = blk;
5877 dev->allocationPage = c;
5878 dev->allocationBlockFinder = blk;
5879 /* Set block finder here to encourage the allocator to go forth from here. */
5883 dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
5884 } else if (tags.chunkId > 0) {
5885 /* chunkId > 0 so it is a data chunk... */
5886 unsigned int endpos;
5888 yaffs_SetChunkBit(dev, blk, c);
5891 in = yaffs_FindOrCreateObjectByNumber(dev,
5894 YAFFS_OBJECT_TYPE_FILE);
5895 /* PutChunkIntoFile checks for a clash (two data chunks with
5896 * the same chunkId).
5903 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5908 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5911 in->variantType == YAFFS_OBJECT_TYPE_FILE
5912 && in->variant.fileVariant.scannedFileSize <
5914 in->variant.fileVariant.
5915 scannedFileSize = endpos;
5916 if (!dev->param.useHeaderFileSize) {
5917 in->variant.fileVariant.
5919 in->variant.fileVariant.
5924 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5926 /* chunkId == 0, so it is an ObjectHeader.
5927 * Thus, we read in the object header and make the object
5929 yaffs_SetChunkBit(dev, blk, c);
5932 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5936 oh = (yaffs_ObjectHeader *) chunkData;
5938 in = yaffs_FindObjectByNumber(dev,
5940 if (in && in->variantType != oh->type) {
5941 /* This should not happen, but somehow
5942 * Wev'e ended up with an objectId that has been reused but not yet
5943 * deleted, and worse still it has changed type. Delete the old object.
5946 yaffs_DeleteObject(in);
5951 in = yaffs_FindOrCreateObjectByNumber(dev,
5959 if (in && oh->shadowsObject > 0) {
5961 struct yaffs_ShadowFixerStruct *fixer;
5962 fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5964 fixer->next = shadowFixerList;
5965 shadowFixerList = fixer;
5966 fixer->objectId = tags.objectId;
5967 fixer->shadowedId = oh->shadowsObject;
5972 if (in && in->valid) {
5973 /* We have already filled this one. We have a duplicate and need to resolve it. */
5975 unsigned existingSerial = in->serial;
5976 unsigned newSerial = tags.serialNumber;
5978 if (((existingSerial + 1) & 3) == newSerial) {
5979 /* Use new one - destroy the exisiting one */
5980 yaffs_DeleteChunk(dev,
5985 /* Use existing - destroy this one. */
5986 yaffs_DeleteChunk(dev, chunk, 1,
5991 if (in && !in->valid &&
5992 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5993 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5994 /* We only load some info, don't fiddle with directory structure */
5996 in->variantType = oh->type;
5998 in->yst_mode = oh->yst_mode;
5999 #ifdef CONFIG_YAFFS_WINCE
6000 in->win_atime[0] = oh->win_atime[0];
6001 in->win_ctime[0] = oh->win_ctime[0];
6002 in->win_mtime[0] = oh->win_mtime[0];
6003 in->win_atime[1] = oh->win_atime[1];
6004 in->win_ctime[1] = oh->win_ctime[1];
6005 in->win_mtime[1] = oh->win_mtime[1];
6007 in->yst_uid = oh->yst_uid;
6008 in->yst_gid = oh->yst_gid;
6009 in->yst_atime = oh->yst_atime;
6010 in->yst_mtime = oh->yst_mtime;
6011 in->yst_ctime = oh->yst_ctime;
6012 in->yst_rdev = oh->yst_rdev;
6014 in->hdrChunk = chunk;
6015 in->serial = tags.serialNumber;
6017 } else if (in && !in->valid) {
6018 /* we need to load this info */
6021 in->variantType = oh->type;
6023 in->yst_mode = oh->yst_mode;
6024 #ifdef CONFIG_YAFFS_WINCE
6025 in->win_atime[0] = oh->win_atime[0];
6026 in->win_ctime[0] = oh->win_ctime[0];
6027 in->win_mtime[0] = oh->win_mtime[0];
6028 in->win_atime[1] = oh->win_atime[1];
6029 in->win_ctime[1] = oh->win_ctime[1];
6030 in->win_mtime[1] = oh->win_mtime[1];
6032 in->yst_uid = oh->yst_uid;
6033 in->yst_gid = oh->yst_gid;
6034 in->yst_atime = oh->yst_atime;
6035 in->yst_mtime = oh->yst_mtime;
6036 in->yst_ctime = oh->yst_ctime;
6037 in->yst_rdev = oh->yst_rdev;
6039 in->hdrChunk = chunk;
6040 in->serial = tags.serialNumber;
6042 yaffs_SetObjectName(in, oh->name);
6045 /* directory stuff...
6050 yaffs_FindOrCreateObjectByNumber
6051 (dev, oh->parentObjectId,
6052 YAFFS_OBJECT_TYPE_DIRECTORY);
6055 if (parent && parent->variantType ==
6056 YAFFS_OBJECT_TYPE_UNKNOWN) {
6057 /* Set up as a directory */
6058 parent->variantType =
6059 YAFFS_OBJECT_TYPE_DIRECTORY;
6060 YINIT_LIST_HEAD(&parent->variant.
6063 } else if (!parent || parent->variantType !=
6064 YAFFS_OBJECT_TYPE_DIRECTORY) {
6065 /* Hoosterman, another problem....
6066 * We're trying to use a non-directory as a directory
6069 T(YAFFS_TRACE_ERROR,
6071 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6073 parent = dev->lostNFoundDir;
6076 yaffs_AddObjectToDirectory(parent, in);
6078 if (0 && (parent == dev->deletedDir ||
6079 parent == dev->unlinkedDir)) {
6080 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
6081 dev->nDeletedFiles++;
6083 /* Note re hardlinks.
6084 * Since we might scan a hardlink before its equivalent object is scanned
6085 * we put them all in a list.
6086 * After scanning is complete, we should have all the objects, so we run through this
6087 * list and fix up all the chains.
6090 switch (in->variantType) {
6091 case YAFFS_OBJECT_TYPE_UNKNOWN:
6092 /* Todo got a problem */
6094 case YAFFS_OBJECT_TYPE_FILE:
6095 if (dev->param.useHeaderFileSize)
6097 in->variant.fileVariant.
6102 case YAFFS_OBJECT_TYPE_HARDLINK:
6103 in->variant.hardLinkVariant.
6104 equivalentObjectId =
6105 oh->equivalentObjectId;
6106 in->hardLinks.next =
6107 (struct ylist_head *)
6111 case YAFFS_OBJECT_TYPE_DIRECTORY:
6114 case YAFFS_OBJECT_TYPE_SPECIAL:
6117 case YAFFS_OBJECT_TYPE_SYMLINK:
6118 in->variant.symLinkVariant.alias =
6119 yaffs_CloneString(oh->alias);
6120 if (!in->variant.symLinkVariant.alias)
6129 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6130 /* If we got this far while scanning, then the block is fully allocated.*/
6131 state = YAFFS_BLOCK_STATE_FULL;
6134 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6135 /* If the block was partially allocated then treat it as fully allocated.*/
6136 state = YAFFS_BLOCK_STATE_FULL;
6137 dev->allocationBlock = -1;
6140 bi->blockState = state;
6142 /* Now let's see if it was dirty */
6143 if (bi->pagesInUse == 0 &&
6144 !bi->hasShrinkHeader &&
6145 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6146 yaffs_BlockBecameDirty(dev, blk);
6152 /* Ok, we've done all the scanning.
6153 * Fix up the hard link chains.
6154 * We should now have scanned all the objects, now it's time to add these
6158 yaffs_HardlinkFixup(dev, hardList);
6160 /* Fix up any shadowed objects */
6162 struct yaffs_ShadowFixerStruct *fixer;
6165 while (shadowFixerList) {
6166 fixer = shadowFixerList;
6167 shadowFixerList = fixer->next;
6168 /* Complete the rename transaction by deleting the shadowed object
6169 * then setting the object header to unshadowed.
6171 obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6173 yaffs_DeleteObject(obj);
6175 obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6178 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6184 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6189 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6195 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6198 yaffs_ObjectHeader *oh;
6200 yaffs_ExtendedTags tags;
6202 int alloc_failed = 0;
6210 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6212 in->lazyLoaded ? "not yet" : "already"));
6215 if (in->lazyLoaded && in->hdrChunk > 0) {
6217 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6219 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6220 oh = (yaffs_ObjectHeader *) chunkData;
6222 in->yst_mode = oh->yst_mode;
6223 #ifdef CONFIG_YAFFS_WINCE
6224 in->win_atime[0] = oh->win_atime[0];
6225 in->win_ctime[0] = oh->win_ctime[0];
6226 in->win_mtime[0] = oh->win_mtime[0];
6227 in->win_atime[1] = oh->win_atime[1];
6228 in->win_ctime[1] = oh->win_ctime[1];
6229 in->win_mtime[1] = oh->win_mtime[1];
6231 in->yst_uid = oh->yst_uid;
6232 in->yst_gid = oh->yst_gid;
6233 in->yst_atime = oh->yst_atime;
6234 in->yst_mtime = oh->yst_mtime;
6235 in->yst_ctime = oh->yst_ctime;
6236 in->yst_rdev = oh->yst_rdev;
6239 yaffs_SetObjectName(in, oh->name);
6241 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6242 in->variant.symLinkVariant.alias =
6243 yaffs_CloneString(oh->alias);
6244 if (!in->variant.symLinkVariant.alias)
6245 alloc_failed = 1; /* Not returned to caller */
6248 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6252 static int yaffs_ScanBackwards(yaffs_Device *dev)
6254 yaffs_ExtendedTags tags;
6259 int nBlocksToScan = 0;
6265 yaffs_BlockState state;
6266 yaffs_Object *hardList = NULL;
6267 yaffs_BlockInfo *bi;
6268 __u32 sequenceNumber;
6269 yaffs_ObjectHeader *oh;
6271 yaffs_Object *parent;
6272 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6278 int foundChunksInBlock;
6279 int equivalentObjectId;
6280 int alloc_failed = 0;
6283 yaffs_BlockIndex *blockIndex = NULL;
6284 int altBlockIndex = 0;
6286 if (!dev->param.isYaffs2) {
6288 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6294 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
6295 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6298 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6300 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6303 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6309 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6313 dev->blocksInCheckpoint = 0;
6315 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6317 /* Scan all the blocks to determine their state */
6318 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6319 bi = yaffs_GetBlockInfo(dev, blk);
6320 yaffs_ClearChunkBits(dev, blk);
6322 bi->softDeletions = 0;
6324 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6326 bi->blockState = state;
6327 bi->sequenceNumber = sequenceNumber;
6329 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6330 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6331 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6332 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6334 T(YAFFS_TRACE_SCAN_DEBUG,
6335 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6336 state, sequenceNumber));
6339 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6340 dev->blocksInCheckpoint++;
6342 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6343 T(YAFFS_TRACE_BAD_BLOCKS,
6344 (TSTR("block %d is bad" TENDSTR), blk));
6345 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6346 T(YAFFS_TRACE_SCAN_DEBUG,
6347 (TSTR("Block empty " TENDSTR)));
6348 dev->nErasedBlocks++;
6349 dev->nFreeChunks += dev->param.nChunksPerBlock;
6350 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6352 /* Determine the highest sequence number */
6353 if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6354 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6356 blockIndex[nBlocksToScan].seq = sequenceNumber;
6357 blockIndex[nBlocksToScan].block = blk;
6361 if (sequenceNumber >= dev->sequenceNumber)
6362 dev->sequenceNumber = sequenceNumber;
6364 /* TODO: Nasty sequence number! */
6367 ("Block scanning block %d has bad sequence number %d"
6368 TENDSTR), blk, sequenceNumber));
6375 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6381 /* Sort the blocks */
6382 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6384 /* Use qsort now. */
6385 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6389 /* Dungy old bubble sort... */
6391 yaffs_BlockIndex temp;
6395 for (i = 0; i < nBlocksToScan; i++)
6396 for (j = i + 1; j < nBlocksToScan; j++)
6397 if (blockIndex[i].seq > blockIndex[j].seq) {
6398 temp = blockIndex[j];
6399 blockIndex[j] = blockIndex[i];
6400 blockIndex[i] = temp;
6407 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6409 /* Now scan the blocks looking at the data. */
6411 endIterator = nBlocksToScan - 1;
6412 T(YAFFS_TRACE_SCAN_DEBUG,
6413 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6415 /* For each block.... backwards */
6416 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6418 /* Cooperative multitasking! This loop can run for so
6419 long that watchdog timers expire. */
6422 /* get the block to scan in the correct order */
6423 blk = blockIndex[blockIterator].block;
6425 bi = yaffs_GetBlockInfo(dev, blk);
6428 state = bi->blockState;
6432 /* For each chunk in each block that needs scanning.... */
6433 foundChunksInBlock = 0;
6434 for (c = dev->param.nChunksPerBlock - 1;
6435 !alloc_failed && c >= 0 &&
6436 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6437 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6438 /* Scan backwards...
6439 * Read the tags and decide what to do
6442 chunk = blk * dev->param.nChunksPerBlock + c;
6444 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6447 /* Let's have a good look at this chunk... */
6449 if (!tags.chunkUsed) {
6450 /* An unassigned chunk in the block.
6451 * If there are used chunks after this one, then
6452 * it is a chunk that was skipped due to failing the erased
6453 * check. Just skip it so that it can be deleted.
6454 * But, more typically, We get here when this is an unallocated
6455 * chunk and his means that either the block is empty or
6456 * this is the one being allocated from
6459 if (foundChunksInBlock) {
6460 /* This is a chunk that was skipped due to failing the erased check */
6461 } else if (c == 0) {
6462 /* We're looking at the first chunk in the block so the block is unused */
6463 state = YAFFS_BLOCK_STATE_EMPTY;
6464 dev->nErasedBlocks++;
6466 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6467 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6468 if (dev->sequenceNumber == bi->sequenceNumber) {
6469 /* this is the block being allocated from */
6473 (" Allocating from %d %d"
6476 state = YAFFS_BLOCK_STATE_ALLOCATING;
6477 dev->allocationBlock = blk;
6478 dev->allocationPage = c;
6479 dev->allocationBlockFinder = blk;
6481 /* This is a partially written block that is not
6482 * the current allocation block.
6485 T(YAFFS_TRACE_ALWAYS,
6486 (TSTR("Partially written block %d detected" TENDSTR),
6494 } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6496 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6501 } else if (tags.chunkId > 0) {
6502 /* chunkId > 0 so it is a data chunk... */
6503 unsigned int endpos;
6505 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6507 foundChunksInBlock = 1;
6510 yaffs_SetChunkBit(dev, blk, c);
6513 in = yaffs_FindOrCreateObjectByNumber(dev,
6516 YAFFS_OBJECT_TYPE_FILE);
6523 in->variantType == YAFFS_OBJECT_TYPE_FILE
6524 && chunkBase < in->variant.fileVariant.shrinkSize) {
6525 /* This has not been invalidated by a resize */
6526 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
6530 /* File size is calculated by looking at the data chunks if we have not
6531 * seen an object header yet. Stop this practice once we find an object header.
6533 endpos = chunkBase + tags.byteCount;
6535 if (!in->valid && /* have not got an object header yet */
6536 in->variant.fileVariant.scannedFileSize < endpos) {
6537 in->variant.fileVariant.scannedFileSize = endpos;
6538 in->variant.fileVariant.fileSize = endpos;
6542 /* This chunk has been invalidated by a resize, or a past file deletion
6543 * so delete the chunk*/
6544 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6548 /* chunkId == 0, so it is an ObjectHeader.
6549 * Thus, we read in the object header and make the object
6551 foundChunksInBlock = 1;
6553 yaffs_SetChunkBit(dev, blk, c);
6559 if (tags.extraHeaderInfoAvailable) {
6560 in = yaffs_FindOrCreateObjectByNumber(dev,
6562 tags.extraObjectType);
6568 (!in->valid && dev->param.disableLazyLoad) ||
6569 tags.extraShadows ||
6571 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6572 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6574 /* If we don't have valid info then we need to read the chunk
6575 * TODO In future we can probably defer reading the chunk and
6576 * living with invalid data until needed.
6579 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6584 oh = (yaffs_ObjectHeader *) chunkData;
6586 if (dev->param.inbandTags) {
6587 /* Fix up the header if they got corrupted by inband tags */
6588 oh->shadowsObject = oh->inbandShadowsObject;
6589 oh->isShrink = oh->inbandIsShrink;
6593 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6601 /* TODO Hoosterman we have a problem! */
6602 T(YAFFS_TRACE_ERROR,
6604 ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
6605 TENDSTR), tags.objectId, chunk));
6610 /* We have already filled this one.
6611 * We have a duplicate that will be discarded, but
6612 * we first have to suck out resize info if it is a file.
6615 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6617 oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6618 (tags.extraHeaderInfoAvailable &&
6619 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6621 (oh) ? oh->fileSize : tags.
6623 __u32 parentObjectId =
6625 parentObjectId : tags.
6626 extraParentObjectId;
6630 (oh) ? oh->isShrink : tags.
6631 extraIsShrinkHeader;
6633 /* If it is deleted (unlinked at start also means deleted)
6634 * we treat the file size as being zeroed at this point.
6636 if (parentObjectId ==
6637 YAFFS_OBJECTID_DELETED
6638 || parentObjectId ==
6639 YAFFS_OBJECTID_UNLINKED) {
6644 if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
6645 in->variant.fileVariant.shrinkSize = thisSize;
6648 bi->hasShrinkHeader = 1;
6651 /* Use existing - destroy this one. */
6652 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6656 if (!in->valid && in->variantType !=
6657 (oh ? oh->type : tags.extraObjectType))
6658 T(YAFFS_TRACE_ERROR, (
6659 TSTR("yaffs tragedy: Bad object type, "
6660 TCONT("%d != %d, for object %d at chunk ")
6661 TCONT("%d during scan")
6663 oh->type : tags.extraObjectType,
6664 in->variantType, tags.objectId,
6668 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6670 YAFFS_OBJECTID_LOSTNFOUND)) {
6671 /* We only load some info, don't fiddle with directory structure */
6675 in->variantType = oh->type;
6677 in->yst_mode = oh->yst_mode;
6678 #ifdef CONFIG_YAFFS_WINCE
6679 in->win_atime[0] = oh->win_atime[0];
6680 in->win_ctime[0] = oh->win_ctime[0];
6681 in->win_mtime[0] = oh->win_mtime[0];
6682 in->win_atime[1] = oh->win_atime[1];
6683 in->win_ctime[1] = oh->win_ctime[1];
6684 in->win_mtime[1] = oh->win_mtime[1];
6686 in->yst_uid = oh->yst_uid;
6687 in->yst_gid = oh->yst_gid;
6688 in->yst_atime = oh->yst_atime;
6689 in->yst_mtime = oh->yst_mtime;
6690 in->yst_ctime = oh->yst_ctime;
6691 in->yst_rdev = oh->yst_rdev;
6695 in->variantType = tags.extraObjectType;
6699 in->hdrChunk = chunk;
6701 } else if (!in->valid) {
6702 /* we need to load this info */
6705 in->hdrChunk = chunk;
6708 in->variantType = oh->type;
6710 in->yst_mode = oh->yst_mode;
6711 #ifdef CONFIG_YAFFS_WINCE
6712 in->win_atime[0] = oh->win_atime[0];
6713 in->win_ctime[0] = oh->win_ctime[0];
6714 in->win_mtime[0] = oh->win_mtime[0];
6715 in->win_atime[1] = oh->win_atime[1];
6716 in->win_ctime[1] = oh->win_ctime[1];
6717 in->win_mtime[1] = oh->win_mtime[1];
6719 in->yst_uid = oh->yst_uid;
6720 in->yst_gid = oh->yst_gid;
6721 in->yst_atime = oh->yst_atime;
6722 in->yst_mtime = oh->yst_mtime;
6723 in->yst_ctime = oh->yst_ctime;
6724 in->yst_rdev = oh->yst_rdev;
6727 if (oh->shadowsObject > 0)
6728 yaffs_HandleShadowedObject(dev,
6735 yaffs_SetObjectName(in, oh->name);
6737 yaffs_FindOrCreateObjectByNumber
6738 (dev, oh->parentObjectId,
6739 YAFFS_OBJECT_TYPE_DIRECTORY);
6741 fileSize = oh->fileSize;
6742 isShrink = oh->isShrink;
6743 equivalentObjectId = oh->equivalentObjectId;
6746 in->variantType = tags.extraObjectType;
6748 yaffs_FindOrCreateObjectByNumber
6749 (dev, tags.extraParentObjectId,
6750 YAFFS_OBJECT_TYPE_DIRECTORY);
6751 fileSize = tags.extraFileLength;
6752 isShrink = tags.extraIsShrinkHeader;
6753 equivalentObjectId = tags.extraEquivalentObjectId;
6762 /* directory stuff...
6766 if (parent && parent->variantType ==
6767 YAFFS_OBJECT_TYPE_UNKNOWN) {
6768 /* Set up as a directory */
6769 parent->variantType =
6770 YAFFS_OBJECT_TYPE_DIRECTORY;
6771 YINIT_LIST_HEAD(&parent->variant.
6774 } else if (!parent || parent->variantType !=
6775 YAFFS_OBJECT_TYPE_DIRECTORY) {
6776 /* Hoosterman, another problem....
6777 * We're trying to use a non-directory as a directory
6780 T(YAFFS_TRACE_ERROR,
6782 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6784 parent = dev->lostNFoundDir;
6787 yaffs_AddObjectToDirectory(parent, in);
6789 itsUnlinked = (parent == dev->deletedDir) ||
6790 (parent == dev->unlinkedDir);
6793 /* Mark the block as having a shrinkHeader */
6794 bi->hasShrinkHeader = 1;
6797 /* Note re hardlinks.
6798 * Since we might scan a hardlink before its equivalent object is scanned
6799 * we put them all in a list.
6800 * After scanning is complete, we should have all the objects, so we run
6801 * through this list and fix up all the chains.
6804 switch (in->variantType) {
6805 case YAFFS_OBJECT_TYPE_UNKNOWN:
6806 /* Todo got a problem */
6808 case YAFFS_OBJECT_TYPE_FILE:
6810 if (in->variant.fileVariant.
6811 scannedFileSize < fileSize) {
6812 /* This covers the case where the file size is greater
6813 * than where the data is
6814 * This will happen if the file is resized to be larger
6815 * than its current data extents.
6817 in->variant.fileVariant.fileSize = fileSize;
6818 in->variant.fileVariant.scannedFileSize = fileSize;
6821 if (in->variant.fileVariant.shrinkSize > fileSize)
6822 in->variant.fileVariant.shrinkSize = fileSize;
6826 case YAFFS_OBJECT_TYPE_HARDLINK:
6828 in->variant.hardLinkVariant.equivalentObjectId =
6830 in->hardLinks.next =
6831 (struct ylist_head *) hardList;
6835 case YAFFS_OBJECT_TYPE_DIRECTORY:
6838 case YAFFS_OBJECT_TYPE_SPECIAL:
6841 case YAFFS_OBJECT_TYPE_SYMLINK:
6843 in->variant.symLinkVariant.alias =
6844 yaffs_CloneString(oh->alias);
6845 if (!in->variant.symLinkVariant.alias)
6855 } /* End of scanning for each chunk */
6857 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6858 /* If we got this far while scanning, then the block is fully allocated. */
6859 state = YAFFS_BLOCK_STATE_FULL;
6863 bi->blockState = state;
6865 /* Now let's see if it was dirty */
6866 if (bi->pagesInUse == 0 &&
6867 !bi->hasShrinkHeader &&
6868 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6869 yaffs_BlockBecameDirty(dev, blk);
6874 yaffs_SkipRestOfBlock(dev);
6877 YFREE_ALT(blockIndex);
6881 /* Ok, we've done all the scanning.
6882 * Fix up the hard link chains.
6883 * We should now have scanned all the objects, now it's time to add these
6886 yaffs_HardlinkFixup(dev, hardList);
6889 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6894 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6899 /*------------------------------ Directory Functions ----------------------------- */
6901 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6903 struct ylist_head *lh;
6904 yaffs_Object *listObj;
6909 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6914 if (yaffs_SkipVerification(obj->myDev))
6918 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6923 if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6924 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6928 /* Iterate through the objects in each hash entry */
6930 ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6932 listObj = ylist_entry(lh, yaffs_Object, siblings);
6933 yaffs_VerifyObject(listObj);
6940 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6945 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6947 struct ylist_head *lh;
6948 yaffs_Object *listObj;
6955 if (yaffs_SkipFullVerification(directory->myDev))
6958 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6959 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6963 /* Iterate through the objects in each hash entry */
6965 ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6967 listObj = ylist_entry(lh, yaffs_Object, siblings);
6968 if (listObj->parent != directory) {
6969 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6972 yaffs_VerifyObjectInDirectory(listObj);
6978 *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6979 * link (ie. name) is created or deleted in the directory.
6982 * create dir/a : update dir's mtime/ctime
6983 * rm dir/a: update dir's mtime/ctime
6984 * modify dir/a: don't update dir's mtimme/ctime
6987 static void yaffs_UpdateParent(yaffs_Object *obj)
6993 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
6995 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
6998 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
7000 yaffs_Device *dev = obj->myDev;
7001 yaffs_Object *parent;
7003 yaffs_VerifyObjectInDirectory(obj);
7004 parent = obj->parent;
7006 yaffs_VerifyDirectory(parent);
7008 if (dev && dev->param.removeObjectCallback)
7009 dev->param.removeObjectCallback(obj);
7012 ylist_del_init(&obj->siblings);
7015 yaffs_VerifyDirectory(parent);
7018 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
7022 T(YAFFS_TRACE_ALWAYS,
7024 ("tragedy: Trying to add an object to a null pointer directory"
7029 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7030 T(YAFFS_TRACE_ALWAYS,
7032 ("tragedy: Trying to add an object to a non-directory"
7037 if (obj->siblings.prev == NULL) {
7038 /* Not initialised */
7043 yaffs_VerifyDirectory(directory);
7045 yaffs_RemoveObjectFromDirectory(obj);
7049 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7050 obj->parent = directory;
7052 if (directory == obj->myDev->unlinkedDir
7053 || directory == obj->myDev->deletedDir) {
7055 obj->myDev->nUnlinkedFiles++;
7056 obj->renameAllowed = 0;
7059 yaffs_VerifyDirectory(directory);
7060 yaffs_VerifyObjectInDirectory(obj);
7063 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7068 struct ylist_head *i;
7069 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7077 T(YAFFS_TRACE_ALWAYS,
7079 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7084 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7085 T(YAFFS_TRACE_ALWAYS,
7087 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7091 sum = yaffs_CalcNameSum(name);
7093 ylist_for_each(i, &directory->variant.directoryVariant.children) {
7095 l = ylist_entry(i, yaffs_Object, siblings);
7097 if (l->parent != directory)
7100 yaffs_CheckObjectDetailsLoaded(l);
7102 /* Special case for lost-n-found */
7103 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7104 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7106 } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7107 /* LostnFound chunk called Objxxx
7110 yaffs_GetObjectName(l, buffer,
7111 YAFFS_MAX_NAME_LENGTH + 1);
7112 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7123 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7124 int (*fn) (yaffs_Object *))
7126 struct ylist_head *i;
7130 T(YAFFS_TRACE_ALWAYS,
7132 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7137 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7138 T(YAFFS_TRACE_ALWAYS,
7140 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7145 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7147 l = ylist_entry(i, yaffs_Object, siblings);
7158 /* GetEquivalentObject dereferences any hard links to get to the
7162 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7164 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7165 /* We want the object id of the equivalent object, not this one */
7166 obj = obj->variant.hardLinkVariant.equivalentObject;
7167 yaffs_CheckObjectDetailsLoaded(obj);
7172 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7174 memset(name, 0, buffSize * sizeof(YCHAR));
7176 yaffs_CheckObjectDetailsLoaded(obj);
7178 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7179 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7180 } else if (obj->hdrChunk <= 0) {
7182 YCHAR numString[20];
7183 YCHAR *x = &numString[19];
7184 unsigned v = obj->objectId;
7188 *x = '0' + (v % 10);
7191 /* make up a name */
7192 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7193 yaffs_strcat(locName, x);
7194 yaffs_strncpy(name, locName, buffSize - 1);
7197 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7198 else if (obj->shortName[0])
7199 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7203 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7205 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7207 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7209 if (obj->hdrChunk > 0) {
7210 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7211 obj->hdrChunk, buffer,
7214 yaffs_strncpy(name, oh->name, buffSize - 1);
7217 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7220 return yaffs_strnlen(name,buffSize-1);
7223 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7225 /* Dereference any hard linking */
7226 obj = yaffs_GetEquivalentObject(obj);
7228 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7229 return obj->variant.fileVariant.fileSize;
7230 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7231 if(!obj->variant.symLinkVariant.alias)
7233 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7235 /* Only a directory should drop through to here */
7236 return obj->myDev->nDataBytesPerChunk;
7240 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7243 struct ylist_head *i;
7246 count++; /* the object itself */
7248 ylist_for_each(i, &obj->hardLinks)
7249 count++; /* add the hard links; */
7254 int yaffs_GetObjectInode(yaffs_Object *obj)
7256 obj = yaffs_GetEquivalentObject(obj);
7258 return obj->objectId;
7261 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7263 obj = yaffs_GetEquivalentObject(obj);
7265 switch (obj->variantType) {
7266 case YAFFS_OBJECT_TYPE_FILE:
7269 case YAFFS_OBJECT_TYPE_DIRECTORY:
7272 case YAFFS_OBJECT_TYPE_SYMLINK:
7275 case YAFFS_OBJECT_TYPE_HARDLINK:
7278 case YAFFS_OBJECT_TYPE_SPECIAL:
7279 if (S_ISFIFO(obj->yst_mode))
7281 if (S_ISCHR(obj->yst_mode))
7283 if (S_ISBLK(obj->yst_mode))
7285 if (S_ISSOCK(obj->yst_mode))
7293 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7295 obj = yaffs_GetEquivalentObject(obj);
7296 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7297 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7299 return yaffs_CloneString(_Y(""));
7302 #ifndef CONFIG_YAFFS_WINCE
7304 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7306 unsigned int valid = attr->ia_valid;
7308 if (valid & ATTR_MODE)
7309 obj->yst_mode = attr->ia_mode;
7310 if (valid & ATTR_UID)
7311 obj->yst_uid = attr->ia_uid;
7312 if (valid & ATTR_GID)
7313 obj->yst_gid = attr->ia_gid;
7315 if (valid & ATTR_ATIME)
7316 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7317 if (valid & ATTR_CTIME)
7318 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7319 if (valid & ATTR_MTIME)
7320 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7322 if (valid & ATTR_SIZE)
7323 yaffs_ResizeFile(obj, attr->ia_size);
7325 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7330 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7332 unsigned int valid = 0;
7334 attr->ia_mode = obj->yst_mode;
7336 attr->ia_uid = obj->yst_uid;
7338 attr->ia_gid = obj->yst_gid;
7341 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7342 valid |= ATTR_ATIME;
7343 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7344 valid |= ATTR_CTIME;
7345 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7346 valid |= ATTR_MTIME;
7348 attr->ia_size = yaffs_GetFileSize(obj);
7351 attr->ia_valid = valid;
7359 int yaffs_DumpObject(yaffs_Object *obj)
7363 yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7365 T(YAFFS_TRACE_ALWAYS,
7367 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7368 " chunk %d type %d size %d\n"
7369 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7370 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7371 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7377 /*---------------------------- Initialisation code -------------------------------------- */
7379 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7382 /* Common functions, gotta have */
7383 if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
7386 #ifdef CONFIG_YAFFS_YAFFS2
7388 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7389 if (dev->param.writeChunkWithTagsToNAND &&
7390 dev->param.readChunkWithTagsFromNAND &&
7391 !dev->param.writeChunkToNAND &&
7392 !dev->param.readChunkFromNAND &&
7393 dev->param.markNANDBlockBad &&
7394 dev->param.queryNANDBlock)
7398 /* Can use the "spare" style interface for yaffs1 */
7399 if (!dev->param.isYaffs2 &&
7400 !dev->param.writeChunkWithTagsToNAND &&
7401 !dev->param.readChunkWithTagsFromNAND &&
7402 dev->param.writeChunkToNAND &&
7403 dev->param.readChunkFromNAND &&
7404 !dev->param.markNANDBlockBad &&
7405 !dev->param.queryNANDBlock)
7412 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7414 /* Initialise the unlinked, deleted, root and lost and found directories */
7416 dev->lostNFoundDir = dev->rootDir = NULL;
7417 dev->unlinkedDir = dev->deletedDir = NULL;
7420 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7423 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7426 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7427 YAFFS_ROOT_MODE | S_IFDIR);
7428 dev->lostNFoundDir =
7429 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7430 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7432 if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7433 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7440 int yaffs_GutsInitialise(yaffs_Device *dev)
7442 int init_failed = 0;
7446 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7448 /* Check stuff that must be set */
7451 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7455 dev->internalStartBlock = dev->param.startBlock;
7456 dev->internalEndBlock = dev->param.endBlock;
7457 dev->blockOffset = 0;
7458 dev->chunkOffset = 0;
7459 dev->nFreeChunks = 0;
7463 if (dev->param.startBlock == 0) {
7464 dev->internalStartBlock = dev->param.startBlock + 1;
7465 dev->internalEndBlock = dev->param.endBlock + 1;
7466 dev->blockOffset = 1;
7467 dev->chunkOffset = dev->param.nChunksPerBlock;
7470 /* Check geometry parameters. */
7472 if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
7473 (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
7474 (dev->param.inbandTags && !dev->param.isYaffs2) ||
7475 dev->param.nChunksPerBlock < 2 ||
7476 dev->param.nReservedBlocks < 2 ||
7477 dev->internalStartBlock <= 0 ||
7478 dev->internalEndBlock <= 0 ||
7479 dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) { /* otherwise it is too small */
7480 T(YAFFS_TRACE_ALWAYS,
7482 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7483 TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
7487 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7488 T(YAFFS_TRACE_ALWAYS,
7489 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7493 /* Sort out space for inband tags, if required */
7494 if (dev->param.inbandTags)
7495 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7497 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
7499 /* Got the right mix of functions? */
7500 if (!yaffs_CheckDevFunctions(dev)) {
7501 /* Function missing */
7502 T(YAFFS_TRACE_ALWAYS,
7504 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7509 /* This is really a compilation check. */
7510 if (!yaffs_CheckStructures()) {
7511 T(YAFFS_TRACE_ALWAYS,
7512 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7516 if (dev->isMounted) {
7517 T(YAFFS_TRACE_ALWAYS,
7518 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7522 /* Finished with most checks. One or two more checks happen later on too. */
7526 /* OK now calculate a few things for the device */
7529 * Calculate all the chunk size manipulation numbers:
7531 x = dev->nDataBytesPerChunk;
7532 /* We always use dev->chunkShift and dev->chunkDiv */
7533 dev->chunkShift = Shifts(x);
7534 x >>= dev->chunkShift;
7536 /* We only use chunk mask if chunkDiv is 1 */
7537 dev->chunkMask = (1<<dev->chunkShift) - 1;
7540 * Calculate chunkGroupBits.
7541 * We need to find the next power of 2 > than internalEndBlock
7544 x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
7548 /* Set up tnode width if wide tnodes are enabled. */
7549 if (!dev->param.wideTnodesDisabled) {
7550 /* bits must be even so that we end up with 32-bit words */
7554 dev->tnodeWidth = 16;
7556 dev->tnodeWidth = bits;
7558 dev->tnodeWidth = 16;
7560 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7562 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7563 * so if the bitwidth of the
7564 * chunk range we're using is greater than 16 we need
7565 * to figure out chunk shift and chunkGroupSize
7568 if (bits <= dev->tnodeWidth)
7569 dev->chunkGroupBits = 0;
7571 dev->chunkGroupBits = bits - dev->tnodeWidth;
7574 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7576 if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
7577 /* We have a problem because the soft delete won't work if
7578 * the chunk group size > chunks per block.
7579 * This can be remedied by using larger "virtual blocks".
7581 T(YAFFS_TRACE_ALWAYS,
7582 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7587 /* OK, we've finished verifying the device, lets continue with initialisation */
7589 /* More device initialisation */
7590 dev->garbageCollections = 0;
7591 dev->passiveGarbageCollections = 0;
7592 dev->currentDirtyChecker = 0;
7593 dev->bufferedBlock = -1;
7594 dev->doingBufferedBlockRewrite = 0;
7595 dev->nDeletedFiles = 0;
7596 dev->nBackgroundDeletions = 0;
7597 dev->nUnlinkedFiles = 0;
7599 dev->eccUnfixed = 0;
7600 dev->tagsEccFixed = 0;
7601 dev->tagsEccUnfixed = 0;
7602 dev->nErasureFailures = 0;
7603 dev->nErasedBlocks = 0;
7605 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7607 /* Initialise temporary buffers and caches. */
7608 if (!yaffs_InitialiseTempBuffers(dev))
7611 dev->srCache = NULL;
7612 dev->gcCleanupList = NULL;
7616 dev->param.nShortOpCaches > 0) {
7619 int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
7621 if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7622 dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7624 dev->srCache = YMALLOC(srCacheBytes);
7626 buf = (__u8 *) dev->srCache;
7629 memset(dev->srCache, 0, srCacheBytes);
7631 for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
7632 dev->srCache[i].object = NULL;
7633 dev->srCache[i].lastUse = 0;
7634 dev->srCache[i].dirty = 0;
7635 dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
7646 dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
7647 if (!dev->gcCleanupList)
7651 if (dev->param.isYaffs2)
7652 dev->param.useHeaderFileSize = 1;
7654 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7657 yaffs_InitialiseTnodes(dev);
7658 yaffs_InitialiseObjects(dev);
7660 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7665 /* Now scan the flash. */
7666 if (dev->param.isYaffs2) {
7667 if (yaffs_CheckpointRestore(dev)) {
7668 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7669 T(YAFFS_TRACE_ALWAYS,
7670 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7673 /* Clean up the mess caused by an aborted checkpoint load
7674 * and scan backwards.
7676 yaffs_DeinitialiseBlocks(dev);
7677 yaffs_DeinitialiseTnodes(dev);
7678 yaffs_DeinitialiseObjects(dev);
7681 dev->nErasedBlocks = 0;
7682 dev->nFreeChunks = 0;
7683 dev->allocationBlock = -1;
7684 dev->allocationPage = -1;
7685 dev->nDeletedFiles = 0;
7686 dev->nUnlinkedFiles = 0;
7687 dev->nBackgroundDeletions = 0;
7688 dev->oldestDirtySequence = 0;
7690 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7693 yaffs_InitialiseTnodes(dev);
7694 yaffs_InitialiseObjects(dev);
7696 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7699 if (!init_failed && !yaffs_ScanBackwards(dev))
7702 } else if (!yaffs_Scan(dev))
7705 yaffs_StripDeletedObjects(dev);
7706 yaffs_FixHangingObjects(dev);
7707 if(dev->param.emptyLostAndFound)
7708 yaffs_EmptyLostAndFound(dev);
7712 /* Clean up the mess */
7713 T(YAFFS_TRACE_TRACING,
7714 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7716 yaffs_Deinitialise(dev);
7720 /* Zero out stats */
7721 dev->nPageReads = 0;
7722 dev->nPageWrites = 0;
7723 dev->nBlockErasures = 0;
7725 dev->nRetriedWrites = 0;
7727 dev->nRetiredBlocks = 0;
7729 yaffs_VerifyFreeChunks(dev);
7730 yaffs_VerifyBlocks(dev);
7732 /* Clean up any aborted checkpoint data */
7733 if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
7734 yaffs_InvalidateCheckpoint(dev);
7736 T(YAFFS_TRACE_TRACING,
7737 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7742 void yaffs_Deinitialise(yaffs_Device *dev)
7744 if (dev->isMounted) {
7747 yaffs_DeinitialiseBlocks(dev);
7748 yaffs_DeinitialiseTnodes(dev);
7749 yaffs_DeinitialiseObjects(dev);
7750 if (dev->param.nShortOpCaches > 0 &&
7753 for (i = 0; i < dev->param.nShortOpCaches; i++) {
7754 if (dev->srCache[i].data)
7755 YFREE(dev->srCache[i].data);
7756 dev->srCache[i].data = NULL;
7759 YFREE(dev->srCache);
7760 dev->srCache = NULL;
7763 YFREE(dev->gcCleanupList);
7765 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7766 YFREE(dev->tempBuffer[i].buffer);
7770 if (dev->param.deinitialiseNAND)
7771 dev->param.deinitialiseNAND(dev);
7775 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7780 yaffs_BlockInfo *blk;
7782 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7784 blk = yaffs_GetBlockInfo(dev, b);
7786 switch (blk->blockState) {
7787 case YAFFS_BLOCK_STATE_EMPTY:
7788 case YAFFS_BLOCK_STATE_ALLOCATING:
7789 case YAFFS_BLOCK_STATE_COLLECTING:
7790 case YAFFS_BLOCK_STATE_FULL:
7792 (dev->param.nChunksPerBlock - blk->pagesInUse +
7793 blk->softDeletions);
7803 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7805 /* This is what we report to the outside world */
7808 int nDirtyCacheChunks;
7809 int blocksForCheckpoint;
7813 nFree = dev->nFreeChunks;
7815 nFree = yaffs_CountFreeChunks(dev);
7818 nFree += dev->nDeletedFiles;
7820 /* Now count the number of dirty chunks in the cache and subtract those */
7822 for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
7823 if (dev->srCache[i].dirty)
7824 nDirtyCacheChunks++;
7827 nFree -= nDirtyCacheChunks;
7829 nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
7831 /* Now we figure out how much to reserve for the checkpoint and report that... */
7832 blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7833 if (blocksForCheckpoint < 0)
7834 blocksForCheckpoint = 0;
7836 nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
7845 static int yaffs_freeVerificationFailures;
7847 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7852 if (yaffs_SkipVerification(dev))
7855 counted = yaffs_CountFreeChunks(dev);
7857 difference = dev->nFreeChunks - counted;
7860 T(YAFFS_TRACE_ALWAYS,
7861 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7862 dev->nFreeChunks, counted, difference));
7863 yaffs_freeVerificationFailures++;
7867 /*---------------------------------------- YAFFS test code ----------------------*/
7869 #define yaffs_CheckStruct(structure, syze, name) \
7871 if (sizeof(structure) != syze) { \
7872 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7873 name, syze, (int) sizeof(structure))); \
7874 return YAFFS_FAIL; \
7878 static int yaffs_CheckStructures(void)
7880 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7881 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7882 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7883 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7884 /* yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
7886 #ifndef CONFIG_YAFFS_WINCE
7887 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");