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 1.110 2010-02-25 22:41:46 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)
2135 int lowest = 999999;
2137 /* First let's see if we can find one that's empty. */
2139 for (i = 0; i < 10 && lowest > 0; i++) {
2141 x %= YAFFS_NOBJECT_BUCKETS;
2142 if (dev->objectBucket[x].count < lowest) {
2143 lowest = dev->objectBucket[x].count;
2149 /* If we didn't find an empty list, then try
2150 * looking a bit further for a short one
2153 for (i = 0; i < 10 && lowest > 3; i++) {
2155 x %= YAFFS_NOBJECT_BUCKETS;
2156 if (dev->objectBucket[x].count < lowest) {
2157 lowest = dev->objectBucket[x].count;
2166 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2168 int bucket = yaffs_FindNiceObjectBucket(dev);
2170 /* Now find an object value that has not already been taken
2171 * by scanning the list.
2175 struct ylist_head *i;
2177 __u32 n = (__u32) bucket;
2179 /* yaffs_CheckObjectHashSanity(); */
2183 n += YAFFS_NOBJECT_BUCKETS;
2184 if (1 || dev->objectBucket[bucket].count > 0) {
2185 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2186 /* If there is already one in the list */
2187 if (i && ylist_entry(i, yaffs_Object,
2188 hashLink)->objectId == n) {
2198 static void yaffs_HashObject(yaffs_Object *in)
2200 int bucket = yaffs_HashFunction(in->objectId);
2201 yaffs_Device *dev = in->myDev;
2203 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2204 dev->objectBucket[bucket].count++;
2207 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2209 int bucket = yaffs_HashFunction(number);
2210 struct ylist_head *i;
2213 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2214 /* Look if it is in the list */
2216 in = ylist_entry(i, yaffs_Object, hashLink);
2217 if (in->objectId == number) {
2219 /* Don't tell the VFS about this one if it is defered free */
2220 if (in->deferedFree)
2231 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2232 yaffs_ObjectType type)
2234 yaffs_Object *theObject=NULL;
2235 yaffs_Tnode *tn = NULL;
2238 number = yaffs_CreateNewObjectNumber(dev);
2240 if (type == YAFFS_OBJECT_TYPE_FILE) {
2241 tn = yaffs_GetTnode(dev);
2246 theObject = yaffs_AllocateEmptyObject(dev);
2249 yaffs_FreeTnode(dev,tn);
2255 theObject->fake = 0;
2256 theObject->renameAllowed = 1;
2257 theObject->unlinkAllowed = 1;
2258 theObject->objectId = number;
2259 yaffs_HashObject(theObject);
2260 theObject->variantType = type;
2261 #ifdef CONFIG_YAFFS_WINCE
2262 yfsd_WinFileTimeNow(theObject->win_atime);
2263 theObject->win_ctime[0] = theObject->win_mtime[0] =
2264 theObject->win_atime[0];
2265 theObject->win_ctime[1] = theObject->win_mtime[1] =
2266 theObject->win_atime[1];
2270 theObject->yst_atime = theObject->yst_mtime =
2271 theObject->yst_ctime = Y_CURRENT_TIME;
2274 case YAFFS_OBJECT_TYPE_FILE:
2275 theObject->variant.fileVariant.fileSize = 0;
2276 theObject->variant.fileVariant.scannedFileSize = 0;
2277 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2278 theObject->variant.fileVariant.topLevel = 0;
2279 theObject->variant.fileVariant.top = tn;
2281 case YAFFS_OBJECT_TYPE_DIRECTORY:
2282 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2285 case YAFFS_OBJECT_TYPE_SYMLINK:
2286 case YAFFS_OBJECT_TYPE_HARDLINK:
2287 case YAFFS_OBJECT_TYPE_SPECIAL:
2288 /* No action required */
2290 case YAFFS_OBJECT_TYPE_UNKNOWN:
2291 /* todo this should not happen */
2299 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2301 yaffs_ObjectType type)
2303 yaffs_Object *theObject = NULL;
2306 theObject = yaffs_FindObjectByNumber(dev, number);
2309 theObject = yaffs_CreateNewObject(dev, number, type);
2316 static YCHAR *yaffs_CloneString(const YCHAR *str)
2318 YCHAR *newStr = NULL;
2324 len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
2325 newStr = YMALLOC((len + 1) * sizeof(YCHAR));
2327 yaffs_strncpy(newStr, str,len);
2335 * Mknod (create) a new object.
2336 * equivalentObject only has meaning for a hard link;
2337 * aliasString only has meaning for a symlink.
2338 * rdev only has meaning for devices (a subset of special objects)
2341 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2342 yaffs_Object *parent,
2347 yaffs_Object *equivalentObject,
2348 const YCHAR *aliasString, __u32 rdev)
2353 yaffs_Device *dev = parent->myDev;
2355 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2356 if (yaffs_FindObjectByName(parent, name))
2359 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2360 str = yaffs_CloneString(aliasString);
2365 in = yaffs_CreateNewObject(dev, -1, type);
2380 in->variantType = type;
2382 in->yst_mode = mode;
2384 #ifdef CONFIG_YAFFS_WINCE
2385 yfsd_WinFileTimeNow(in->win_atime);
2386 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2387 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2390 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2392 in->yst_rdev = rdev;
2396 in->nDataChunks = 0;
2398 yaffs_SetObjectName(in, name);
2401 yaffs_AddObjectToDirectory(parent, in);
2403 in->myDev = parent->myDev;
2406 case YAFFS_OBJECT_TYPE_SYMLINK:
2407 in->variant.symLinkVariant.alias = str;
2409 case YAFFS_OBJECT_TYPE_HARDLINK:
2410 in->variant.hardLinkVariant.equivalentObject =
2412 in->variant.hardLinkVariant.equivalentObjectId =
2413 equivalentObject->objectId;
2414 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2416 case YAFFS_OBJECT_TYPE_FILE:
2417 case YAFFS_OBJECT_TYPE_DIRECTORY:
2418 case YAFFS_OBJECT_TYPE_SPECIAL:
2419 case YAFFS_OBJECT_TYPE_UNKNOWN:
2424 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2425 /* Could not create the object header, fail the creation */
2426 yaffs_DeleteObject(in);
2430 yaffs_UpdateParent(parent);
2436 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2437 __u32 mode, __u32 uid, __u32 gid)
2439 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2440 uid, gid, NULL, NULL, 0);
2443 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2444 __u32 mode, __u32 uid, __u32 gid)
2446 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2447 mode, uid, gid, NULL, NULL, 0);
2450 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2451 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2453 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2454 uid, gid, NULL, NULL, rdev);
2457 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2458 __u32 mode, __u32 uid, __u32 gid,
2461 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2462 uid, gid, NULL, alias, 0);
2465 /* yaffs_Link returns the object id of the equivalent object.*/
2466 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2467 yaffs_Object *equivalentObject)
2469 /* Get the real object in case we were fed a hard link as an equivalent object */
2470 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2472 if (yaffs_MknodObject
2473 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2474 equivalentObject, NULL, 0)) {
2475 return equivalentObject;
2482 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2483 const YCHAR *newName, int force, int shadows)
2488 yaffs_Object *existingTarget;
2491 newDir = obj->parent; /* use the old directory */
2493 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2494 T(YAFFS_TRACE_ALWAYS,
2496 ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2501 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2502 if (obj->myDev->param.isYaffs2)
2503 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2505 unlinkOp = (newDir == obj->myDev->unlinkedDir
2506 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2508 deleteOp = (newDir == obj->myDev->deletedDir);
2510 existingTarget = yaffs_FindObjectByName(newDir, newName);
2512 /* If the object is a file going into the unlinked directory,
2513 * then it is OK to just stuff it in since duplicate names are allowed.
2514 * else only proceed if the new name does not exist and if we're putting
2515 * it into a directory.
2522 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2523 yaffs_SetObjectName(obj, newName);
2526 yaffs_AddObjectToDirectory(newDir, obj);
2531 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2532 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2539 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2540 yaffs_Object *newDir, const YCHAR *newName)
2542 yaffs_Object *obj = NULL;
2543 yaffs_Object *existingTarget = NULL;
2549 if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2551 if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2554 dev = oldDir->myDev;
2556 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2557 /* Special case for case insemsitive systems (eg. WinCE).
2558 * While look-up is case insensitive, the name isn't.
2559 * Therefore we might want to change x.txt to X.txt
2561 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2565 if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
2569 obj = yaffs_FindObjectByName(oldDir, oldName);
2571 if (obj && obj->renameAllowed) {
2573 /* Now do the handling for an existing target, if there is one */
2575 existingTarget = yaffs_FindObjectByName(newDir, newName);
2576 if (existingTarget &&
2577 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2578 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2579 /* There is a target that is a non-empty directory, so we fail */
2580 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2581 } else if (existingTarget && existingTarget != obj) {
2582 /* Nuke the target first, using shadowing,
2583 * but only if it isn't the same object.
2585 * Note we must disable gc otherwise it can mess up the shadowing.
2589 yaffs_ChangeObjectName(obj, newDir, newName, force,
2590 existingTarget->objectId);
2591 existingTarget->isShadowed = 1;
2592 yaffs_UnlinkObject(existingTarget);
2596 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2598 yaffs_UpdateParent(oldDir);
2599 if(newDir != oldDir)
2600 yaffs_UpdateParent(newDir);
2607 /*------------------------- Block Management and Page Allocation ----------------*/
2609 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2611 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2613 dev->blockInfo = NULL;
2614 dev->chunkBits = NULL;
2616 dev->allocationBlock = -1; /* force it to get a new one */
2618 /* If the first allocation strategy fails, thry the alternate one */
2619 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2620 if (!dev->blockInfo) {
2621 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2622 dev->blockInfoAlt = 1;
2624 dev->blockInfoAlt = 0;
2626 if (dev->blockInfo) {
2627 /* Set up dynamic blockinfo stuff. */
2628 dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
2629 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2630 if (!dev->chunkBits) {
2631 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2632 dev->chunkBitsAlt = 1;
2634 dev->chunkBitsAlt = 0;
2637 if (dev->blockInfo && dev->chunkBits) {
2638 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2639 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2646 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2648 if (dev->blockInfoAlt && dev->blockInfo)
2649 YFREE_ALT(dev->blockInfo);
2650 else if (dev->blockInfo)
2651 YFREE(dev->blockInfo);
2653 dev->blockInfoAlt = 0;
2655 dev->blockInfo = NULL;
2657 if (dev->chunkBitsAlt && dev->chunkBits)
2658 YFREE_ALT(dev->chunkBits);
2659 else if (dev->chunkBits)
2660 YFREE(dev->chunkBits);
2661 dev->chunkBitsAlt = 0;
2662 dev->chunkBits = NULL;
2665 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2666 yaffs_BlockInfo *bi)
2672 if (!dev->param.isYaffs2)
2673 return 1; /* disqualification only applies to yaffs2. */
2675 if (!bi->hasShrinkHeader)
2676 return 1; /* can gc */
2678 /* Find the oldest dirty sequence number if we don't know it and save it
2679 * so we don't have to keep recomputing it.
2681 if (!dev->oldestDirtySequence) {
2682 seq = dev->sequenceNumber;
2684 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2686 b = yaffs_GetBlockInfo(dev, i);
2687 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2688 (b->pagesInUse - b->softDeletions) <
2689 dev->param.nChunksPerBlock && b->sequenceNumber < seq) {
2690 seq = b->sequenceNumber;
2693 dev->oldestDirtySequence = seq;
2696 /* Can't do gc of this block if there are any blocks older than this one that have
2699 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2703 * yaffs_FindRefreshBlock()
2704 * periodically finds the oldest full block by sequence number for refreshing.
2707 static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev)
2712 __u32 oldestSequence = 0;
2714 yaffs_BlockInfo *bi;
2717 * If refresh period < 10 then refreshing is disabled.
2719 if(dev->param.refreshPeriod < 10 ||
2720 !dev->param.isYaffs2)
2724 * Fix broken values.
2726 if(dev->refreshSkip > dev->param.refreshPeriod)
2727 dev->refreshSkip = dev->param.refreshPeriod;
2729 if(dev->refreshSkip > 0){
2735 * Refresh skip is now zero.
2736 * We'll do a refresh this time around....
2737 * Update the refresh skip and find the oldest block.
2739 dev->refreshSkip = dev->param.refreshPeriod;
2740 dev->refreshCount++;
2742 for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
2744 bi = yaffs_GetBlockInfo(dev, b);
2747 if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
2750 bi->sequenceNumber < oldestSequence){
2752 oldestSequence = bi->sequenceNumber;
2759 (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
2760 dev->refreshCount, oldest, oldestSequence));
2767 * FindDiretiestBlock is used to select the dirtiest block (or close enough)
2768 * for garbage collection.
2771 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2774 int b = dev->currentDirtyChecker;
2780 int prioritised = 0;
2781 yaffs_BlockInfo *bi;
2782 int pendingPrioritisedExist = 0;
2784 /* First let's see if we need to grab a prioritised block */
2785 if (dev->hasPendingPrioritisedGCs) {
2786 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2788 bi = yaffs_GetBlockInfo(dev, i);
2789 /* yaffs_VerifyBlock(dev,bi,i); */
2791 if (bi->gcPrioritise) {
2792 pendingPrioritisedExist = 1;
2793 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2794 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2795 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2798 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2803 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2804 dev->hasPendingPrioritisedGCs = 0;
2807 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2809 * else (we're doing a leasurely gc), then we only bother to do this if the
2810 * block has only a few pages in use.
2813 dev->nonAggressiveSkip--;
2815 if (!aggressive && (dev->nonAggressiveSkip > 0))
2820 (aggressive) ? dev->param.nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2824 dev->internalEndBlock - dev->internalStartBlock + 1;
2827 dev->internalEndBlock - dev->internalStartBlock + 1;
2828 iterations = iterations / 16;
2829 if (iterations > 200)
2833 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2835 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2836 b = dev->internalStartBlock;
2838 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2839 T(YAFFS_TRACE_ERROR,
2840 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2844 bi = yaffs_GetBlockInfo(dev, b);
2846 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2847 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2848 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2850 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2854 dev->currentDirtyChecker = b;
2858 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2859 dev->param.nChunksPerBlock - pagesInUse, prioritised));
2862 dev->oldestDirtySequence = 0;
2865 dev->nonAggressiveSkip = 4;
2870 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2872 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2876 /* If the block is still healthy erase it and mark as clean.
2877 * If the block has had a data failure, then retire it.
2880 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2881 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2882 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2884 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2886 if (!bi->needsRetiring) {
2887 yaffs_InvalidateCheckpoint(dev);
2888 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2890 dev->nErasureFailures++;
2891 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2892 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2897 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2899 for (i = 0; i < dev->param.nChunksPerBlock; i++) {
2900 if (!yaffs_CheckChunkErased
2901 (dev, blockNo * dev->param.nChunksPerBlock + i)) {
2902 T(YAFFS_TRACE_ERROR,
2904 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2905 TENDSTR), blockNo, i));
2911 /* Clean it up... */
2912 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2913 bi->sequenceNumber = 0;
2914 dev->nErasedBlocks++;
2916 bi->softDeletions = 0;
2917 bi->hasShrinkHeader = 0;
2918 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2919 bi->gcPrioritise = 0;
2920 yaffs_ClearChunkBits(dev, blockNo);
2922 T(YAFFS_TRACE_ERASE,
2923 (TSTR("Erased block %d" TENDSTR), blockNo));
2925 dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
2927 yaffs_RetireBlock(dev, blockNo);
2928 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2929 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2933 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2937 yaffs_BlockInfo *bi;
2939 if (dev->nErasedBlocks < 1) {
2940 /* Hoosterman we've got a problem.
2941 * Can't get space to gc
2943 T(YAFFS_TRACE_ERROR,
2944 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2949 /* Find an empty block. */
2951 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2952 dev->allocationBlockFinder++;
2953 if (dev->allocationBlockFinder < dev->internalStartBlock
2954 || dev->allocationBlockFinder > dev->internalEndBlock) {
2955 dev->allocationBlockFinder = dev->internalStartBlock;
2958 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2960 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2961 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2962 dev->sequenceNumber++;
2963 bi->sequenceNumber = dev->sequenceNumber;
2964 dev->nErasedBlocks--;
2965 T(YAFFS_TRACE_ALLOCATE,
2966 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2967 dev->allocationBlockFinder, dev->sequenceNumber,
2968 dev->nErasedBlocks));
2969 return dev->allocationBlockFinder;
2973 T(YAFFS_TRACE_ALWAYS,
2975 ("yaffs tragedy: no more erased blocks, but there should have been %d"
2976 TENDSTR), dev->nErasedBlocks));
2983 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2985 if (!dev->nCheckpointBlocksRequired &&
2986 dev->param.isYaffs2) {
2987 /* Not a valid value so recalculate */
2990 int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
2991 int tnodeSize = yaffs_CalcTnodeSize(dev);
2993 nBytes += sizeof(yaffs_CheckpointValidity);
2994 nBytes += sizeof(yaffs_CheckpointDevice);
2995 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2996 nBytes += devBlocks * dev->chunkBitmapStride;
2997 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2998 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2999 nBytes += sizeof(yaffs_CheckpointValidity);
3000 nBytes += sizeof(__u32); /* checksum*/
3002 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
3004 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
3006 dev->nCheckpointBlocksRequired = nBlocks;
3009 return dev->nCheckpointBlocksRequired;
3013 * Check if there's space to allocate...
3014 * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
3016 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
3019 int reservedBlocks = dev->param.nReservedBlocks;
3020 int checkpointBlocks;
3022 if (dev->param.isYaffs2) {
3023 checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) -
3024 dev->blocksInCheckpoint;
3025 if (checkpointBlocks < 0)
3026 checkpointBlocks = 0;
3028 checkpointBlocks = 0;
3031 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
3033 return (dev->nFreeChunks > reservedChunks);
3036 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
3037 yaffs_BlockInfo **blockUsedPtr)
3040 yaffs_BlockInfo *bi;
3042 if (dev->allocationBlock < 0) {
3043 /* Get next block to allocate off */
3044 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
3045 dev->allocationPage = 0;
3048 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
3049 /* Not enough space to allocate unless we're allowed to use the reserve. */
3053 if (dev->nErasedBlocks < dev->param.nReservedBlocks
3054 && dev->allocationPage == 0) {
3055 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
3058 /* Next page please.... */
3059 if (dev->allocationBlock >= 0) {
3060 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3062 retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
3063 dev->allocationPage;
3065 yaffs_SetChunkBit(dev, dev->allocationBlock,
3066 dev->allocationPage);
3068 dev->allocationPage++;
3072 /* If the block is full set the state to full */
3073 if (dev->allocationPage >= dev->param.nChunksPerBlock) {
3074 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3075 dev->allocationBlock = -1;
3084 T(YAFFS_TRACE_ERROR,
3085 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3090 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3094 n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3096 if (dev->allocationBlock > 0)
3097 n += (dev->param.nChunksPerBlock - dev->allocationPage);
3104 * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3105 * if we don't want to write to it.
3107 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3109 if(dev->allocationBlock > 0){
3110 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3111 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3112 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3113 dev->allocationBlock = -1;
3119 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3125 int retVal = YAFFS_OK;
3128 int isCheckpointBlock;
3132 int chunksBefore = yaffs_GetErasedChunks(dev);
3135 yaffs_ExtendedTags tags;
3137 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3139 yaffs_Object *object;
3141 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3144 T(YAFFS_TRACE_TRACING,
3145 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3148 bi->hasShrinkHeader,
3151 /*yaffs_VerifyFreeChunks(dev); */
3153 if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3154 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3156 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
3158 /* Take off the number of soft deleted entries because
3159 * they're going to get really deleted during GC.
3161 if(dev->gcChunk == 0) /* first time through for this block */
3162 dev->nFreeChunks -= bi->softDeletions;
3166 if (isCheckpointBlock ||
3167 !yaffs_StillSomeChunkBits(dev, block)) {
3168 T(YAFFS_TRACE_TRACING,
3170 ("Collecting block %d that has no chunks in use" TENDSTR),
3172 yaffs_BlockBecameDirty(dev, block);
3175 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3177 yaffs_VerifyBlock(dev, bi, block);
3179 maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 10;
3180 oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
3182 for (/* init already done */;
3183 retVal == YAFFS_OK &&
3184 dev->gcChunk < dev->param.nChunksPerBlock &&
3185 (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3187 dev->gcChunk++, oldChunk++) {
3188 if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3190 /* This page is in use and might need to be copied off */
3196 yaffs_InitialiseTags(&tags);
3198 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3202 yaffs_FindObjectByNumber(dev,
3205 T(YAFFS_TRACE_GC_DETAIL,
3207 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3208 dev->gcChunk, tags.objectId, tags.chunkId,
3211 if (object && !yaffs_SkipVerification(dev)) {
3212 if (tags.chunkId == 0)
3213 matchingChunk = object->hdrChunk;
3214 else if (object->softDeleted)
3215 matchingChunk = oldChunk; /* Defeat the test */
3217 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3219 if (oldChunk != matchingChunk)
3220 T(YAFFS_TRACE_ERROR,
3221 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3222 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3227 T(YAFFS_TRACE_ERROR,
3229 ("page %d in gc has no object: %d %d %d "
3231 tags.objectId, tags.chunkId, tags.byteCount));
3236 object->softDeleted &&
3237 tags.chunkId != 0) {
3238 /* Data chunk in a soft deleted file, throw it away
3239 * It's a soft deleted data chunk,
3240 * No need to copy this, just forget about it and
3241 * fix up the object.
3244 object->nDataChunks--;
3246 if (object->nDataChunks <= 0) {
3247 /* remeber to clean up the object */
3248 dev->gcCleanupList[cleanups] =
3254 /* Todo object && object->deleted && object->nDataChunks == 0 */
3255 /* Deleted object header with no data chunks.
3256 * Can be discarded and the file deleted.
3258 object->hdrChunk = 0;
3259 yaffs_FreeTnode(object->myDev,
3262 object->variant.fileVariant.top = NULL;
3263 yaffs_DoGenericObjectDeletion(object);
3265 } else if (object) {
3266 /* It's either a data chunk in a live file or
3267 * an ObjectHeader, so we're interested in it.
3268 * NB Need to keep the ObjectHeaders of deleted files
3269 * until the whole file has been deleted off
3271 tags.serialNumber++;
3275 if (tags.chunkId == 0) {
3276 /* It is an object Id,
3277 * We need to nuke the shrinkheader flags first
3278 * Also need to clean up shadowing.
3279 * We no longer want the shrinkHeader flag since its work is done
3280 * and if it is left in place it will mess up scanning.
3283 yaffs_ObjectHeader *oh;
3284 oh = (yaffs_ObjectHeader *)buffer;
3286 tags.extraIsShrinkHeader = 0;
3287 oh->shadowsObject = 0;
3288 oh->inbandShadowsObject = 0;
3289 if(object->variantType == YAFFS_OBJECT_TYPE_FILE)
3290 oh->fileSize = object->variant.fileVariant.fileSize;
3291 tags.extraShadows = 0;
3293 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3295 yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
3298 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3301 retVal = YAFFS_FAIL;
3304 /* Ok, now fix up the Tnodes etc. */
3306 if (tags.chunkId == 0) {
3308 object->hdrChunk = newChunk;
3309 object->serial = tags.serialNumber;
3311 /* It's a data chunk */
3313 ok = yaffs_PutChunkIntoFile
3321 if (retVal == YAFFS_OK)
3322 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3327 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3330 /* Do any required cleanups */
3331 for (i = 0; i < cleanups; i++) {
3332 /* Time to delete the file too */
3334 yaffs_FindObjectByNumber(dev,
3335 dev->gcCleanupList[i]);
3337 yaffs_FreeTnode(dev,
3338 object->variant.fileVariant.
3340 object->variant.fileVariant.top = NULL;
3343 ("yaffs: About to finally delete object %d"
3344 TENDSTR), object->objectId));
3345 yaffs_DoGenericObjectDeletion(object);
3346 object->myDev->nDeletedFiles--;
3353 yaffs_VerifyCollectedBlock(dev, bi, block);
3357 /* If the gc completed then clear the current gcBlock so that we find another. */
3358 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3359 chunksAfter = yaffs_GetErasedChunks(dev);
3360 if (chunksBefore >= chunksAfter) {
3363 ("gc did not increase free chunks before %d after %d"
3364 TENDSTR), chunksBefore, chunksAfter));
3375 /* New garbage collector
3376 * If we're very low on erased blocks then we do aggressive garbage collection
3377 * otherwise we do "leasurely" garbage collection.
3378 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3379 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3381 * The idea is to help clear out space in a more spread-out manner.
3382 * Dunno if it really does anything useful.
3384 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3388 int gcOk = YAFFS_OK;
3391 int checkpointBlockAdjust;
3393 if (dev->isDoingGC) {
3394 /* Bail out so we don't get recursive gc */
3398 /* This loop should pass the first time.
3399 * We'll only see looping here if the erase of the collected block fails.
3405 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3406 if (checkpointBlockAdjust < 0)
3407 checkpointBlockAdjust = 0;
3409 /* If we need a block soon then do aggressive gc.*/
3410 if (dev->nErasedBlocks < (dev->param.nReservedBlocks + checkpointBlockAdjust + 2))
3415 /* If we don't already have a block being gc'd then see if we should start another */
3417 if (dev->gcBlock < 1 && !aggressive) {
3418 dev->gcBlock = yaffs_FindRefreshBlock(dev);
3421 if (dev->gcBlock < 1) {
3422 dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3426 block = dev->gcBlock;
3429 dev->garbageCollections++;
3431 dev->passiveGarbageCollections++;
3435 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3436 dev->nErasedBlocks, aggressive));
3438 gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3441 if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && block > 0) {
3444 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3445 TENDSTR), dev->nErasedBlocks, maxTries, block));
3447 } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
3451 return aggressive ? gcOk : YAFFS_OK;
3454 /*------------------------- TAGS --------------------------------*/
3456 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3459 return (tags->chunkId == chunkInObject &&
3460 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3465 /*-------------------- Data file manipulation -----------------*/
3467 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3468 yaffs_ExtendedTags *tags)
3470 /*Get the Tnode, then get the level 0 offset chunk offset */
3473 yaffs_ExtendedTags localTags;
3476 yaffs_Device *dev = in->myDev;
3479 /* Passed a NULL, so use our own tags space */
3483 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3486 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3489 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3495 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3496 yaffs_ExtendedTags *tags)
3498 /* Get the Tnode, then get the level 0 offset chunk offset */
3501 yaffs_ExtendedTags localTags;
3503 yaffs_Device *dev = in->myDev;
3507 /* Passed a NULL, so use our own tags space */
3511 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3515 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3518 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3521 /* Delete the entry in the filestructure (if found) */
3523 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3529 #ifdef YAFFS_PARANOID
3531 static int yaffs_CheckFileSanity(yaffs_Object *in)
3539 yaffs_Tags localTags;
3540 yaffs_Tags *tags = &localTags;
3544 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3547 objId = in->objectId;
3548 fSize = in->variant.fileVariant.fileSize;
3550 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3552 for (chunk = 1; chunk <= nChunks; chunk++) {
3553 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3558 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3560 if (yaffs_CheckChunkBits
3561 (dev, theChunk / dev->param.nChunksPerBlock,
3562 theChunk % dev->param.nChunksPerBlock)) {
3564 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3568 (tags, in->objectId, chunk, chunkDeleted)) {
3578 /* T(("No level 0 found for %d\n", chunk)); */
3582 return failed ? YAFFS_FAIL : YAFFS_OK;
3587 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3588 int chunkInNAND, int inScan)
3590 /* NB inScan is zero unless scanning.
3591 * For forward scanning, inScan is > 0;
3592 * for backward scanning inScan is < 0
3594 * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3598 yaffs_Device *dev = in->myDev;
3600 yaffs_ExtendedTags existingTags;
3601 yaffs_ExtendedTags newTags;
3602 unsigned existingSerial, newSerial;
3604 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3605 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3606 * If it is not during Scanning then something went wrong!
3609 T(YAFFS_TRACE_ERROR,
3611 ("yaffs tragedy:attempt to put data chunk into a non-file"
3616 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3620 tn = yaffs_AddOrFindLevel0Tnode(dev,
3621 &in->variant.fileVariant,
3628 /* Dummy insert, bail now */
3631 existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3634 /* If we're scanning then we need to test for duplicates
3635 * NB This does not need to be efficient since it should only ever
3636 * happen when the power fails during a write, then only one
3637 * chunk should ever be affected.
3639 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3640 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3643 if (existingChunk > 0) {
3644 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3645 * thus we have to do a FindChunkInFile to get the real chunk id.
3647 * We have a duplicate now we need to decide which one to use:
3649 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3650 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3651 * YAFFS1: Get both sets of tags and compare serial numbers.
3655 /* Only do this for forward scanning */
3656 yaffs_ReadChunkWithTagsFromNAND(dev,
3660 /* Do a proper find */
3662 yaffs_FindChunkInFile(in, chunkInInode,
3666 if (existingChunk <= 0) {
3667 /*Hoosterman - how did this happen? */
3669 T(YAFFS_TRACE_ERROR,
3671 ("yaffs tragedy: existing chunk < 0 in scan"
3676 /* NB The deleted flags should be false, otherwise the chunks will
3677 * not be loaded during a scan
3681 newSerial = newTags.serialNumber;
3682 existingSerial = existingTags.serialNumber;
3686 (in->myDev->param.isYaffs2 ||
3687 existingChunk <= 0 ||
3688 ((existingSerial + 1) & 3) == newSerial)) {
3689 /* Forward scanning.
3691 * Delete the old one and drop through to update the tnode
3693 yaffs_DeleteChunk(dev, existingChunk, 1,
3696 /* Backward scanning or we want to use the existing one
3698 * Delete the new one and return early so that the tnode isn't changed
3700 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3708 if (existingChunk == 0)
3711 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3716 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3719 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3721 if (chunkInNAND >= 0)
3722 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3725 T(YAFFS_TRACE_NANDACCESS,
3726 (TSTR("Chunk %d not found zero instead" TENDSTR),
3728 /* get sane (zero) data if you read a hole */
3729 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3735 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3739 yaffs_ExtendedTags tags;
3740 yaffs_BlockInfo *bi;
3746 block = chunkId / dev->param.nChunksPerBlock;
3747 page = chunkId % dev->param.nChunksPerBlock;
3750 if (!yaffs_CheckChunkBit(dev, block, page))
3751 T(YAFFS_TRACE_VERIFY,
3752 (TSTR("Deleting invalid chunk %d"TENDSTR),
3755 bi = yaffs_GetBlockInfo(dev, block);
3757 T(YAFFS_TRACE_DELETION,
3758 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3761 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
3763 yaffs_InitialiseTags(&tags);
3765 tags.chunkDeleted = 1;
3767 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3768 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3770 dev->nUnmarkedDeletions++;
3773 /* Pull out of the management area.
3774 * If the whole block became dirty, this will kick off an erasure.
3776 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3777 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3778 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3779 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3782 yaffs_ClearChunkBit(dev, block, page);
3786 if (bi->pagesInUse == 0 &&
3787 !bi->hasShrinkHeader &&
3788 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3789 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3790 yaffs_BlockBecameDirty(dev, block);
3797 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3798 const __u8 *buffer, int nBytes,
3801 /* Find old chunk Need to do this to get serial number
3802 * Write new one and patch into tree.
3803 * Invalidate old tags.
3807 yaffs_ExtendedTags prevTags;
3810 yaffs_ExtendedTags newTags;
3812 yaffs_Device *dev = in->myDev;
3814 yaffs_CheckGarbageCollection(dev);
3816 /* Get the previous chunk at this location in the file if it exists.
3817 * If it does not exist then put a zero into the tree. This creates
3818 * the tnode now, rather than later when it is harder to clean up.
3820 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3821 if(prevChunkId <= 0 &&
3822 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0)){
3825 /* Set up new tags */
3826 yaffs_InitialiseTags(&newTags);
3828 newTags.chunkId = chunkInInode;
3829 newTags.objectId = in->objectId;
3830 newTags.serialNumber =
3831 (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3832 newTags.byteCount = nBytes;
3834 if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
3835 T(YAFFS_TRACE_ERROR,
3836 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3841 * If there isn't already a chunk there then do a dummy
3842 * insert to make sue we have the desired tnode structure.
3844 if(prevChunkId < 1 &&
3845 yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0) != YAFFS_OK)
3849 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3852 if (newChunkId > 0) {
3853 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3855 if (prevChunkId > 0)
3856 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3858 yaffs_CheckFileSanity(in);
3864 /* UpdateObjectHeader updates the header on NAND for an object.
3865 * If name is not NULL, then that new name is used.
3867 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3868 int isShrink, int shadows)
3871 yaffs_BlockInfo *bi;
3873 yaffs_Device *dev = in->myDev;
3880 yaffs_ExtendedTags newTags;
3881 yaffs_ExtendedTags oldTags;
3882 YCHAR *alias = NULL;
3884 __u8 *buffer = NULL;
3885 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3887 yaffs_ObjectHeader *oh = NULL;
3889 yaffs_strcpy(oldName, _Y("silly old name"));
3893 in == dev->rootDir || /* The rootDir should also be saved */
3896 yaffs_CheckGarbageCollection(dev);
3897 yaffs_CheckObjectDetailsLoaded(in);
3899 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3900 oh = (yaffs_ObjectHeader *) buffer;
3902 prevChunkId = in->hdrChunk;
3904 if (prevChunkId > 0) {
3905 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3908 yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3910 memcpy(oldName, oh->name, sizeof(oh->name));
3913 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3915 oh->type = in->variantType;
3916 oh->yst_mode = in->yst_mode;
3917 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3919 #ifdef CONFIG_YAFFS_WINCE
3920 oh->win_atime[0] = in->win_atime[0];
3921 oh->win_ctime[0] = in->win_ctime[0];
3922 oh->win_mtime[0] = in->win_mtime[0];
3923 oh->win_atime[1] = in->win_atime[1];
3924 oh->win_ctime[1] = in->win_ctime[1];
3925 oh->win_mtime[1] = in->win_mtime[1];
3927 oh->yst_uid = in->yst_uid;
3928 oh->yst_gid = in->yst_gid;
3929 oh->yst_atime = in->yst_atime;
3930 oh->yst_mtime = in->yst_mtime;
3931 oh->yst_ctime = in->yst_ctime;
3932 oh->yst_rdev = in->yst_rdev;
3935 oh->parentObjectId = in->parent->objectId;
3937 oh->parentObjectId = 0;
3939 if (name && *name) {
3940 memset(oh->name, 0, sizeof(oh->name));
3941 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3942 } else if (prevChunkId > 0)
3943 memcpy(oh->name, oldName, sizeof(oh->name));
3945 memset(oh->name, 0, sizeof(oh->name));
3947 oh->isShrink = isShrink;
3949 switch (in->variantType) {
3950 case YAFFS_OBJECT_TYPE_UNKNOWN:
3951 /* Should not happen */
3953 case YAFFS_OBJECT_TYPE_FILE:
3955 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3956 || oh->parentObjectId ==
3957 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3958 fileVariant.fileSize;
3960 case YAFFS_OBJECT_TYPE_HARDLINK:
3961 oh->equivalentObjectId =
3962 in->variant.hardLinkVariant.equivalentObjectId;
3964 case YAFFS_OBJECT_TYPE_SPECIAL:
3967 case YAFFS_OBJECT_TYPE_DIRECTORY:
3970 case YAFFS_OBJECT_TYPE_SYMLINK:
3971 alias = in->variant.symLinkVariant.alias;
3973 alias = _Y("no alias");
3974 yaffs_strncpy(oh->alias,
3976 YAFFS_MAX_ALIAS_LENGTH);
3977 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3982 yaffs_InitialiseTags(&newTags);
3984 newTags.chunkId = 0;
3985 newTags.objectId = in->objectId;
3986 newTags.serialNumber = in->serial;
3988 /* Add extra info for file header */
3990 newTags.extraHeaderInfoAvailable = 1;
3991 newTags.extraParentObjectId = oh->parentObjectId;
3992 newTags.extraFileLength = oh->fileSize;
3993 newTags.extraIsShrinkHeader = oh->isShrink;
3994 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3995 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3996 newTags.extraObjectType = in->variantType;
3998 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
4000 /* Create new chunk in NAND */
4002 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
4003 (prevChunkId > 0) ? 1 : 0);
4005 if (newChunkId >= 0) {
4007 in->hdrChunk = newChunkId;
4009 if (prevChunkId > 0) {
4010 yaffs_DeleteChunk(dev, prevChunkId, 1,
4014 if (!yaffs_ObjectHasCachedWriteData(in))
4017 /* If this was a shrink, then mark the block that the chunk lives on */
4019 bi = yaffs_GetBlockInfo(in->myDev,
4020 newChunkId / in->myDev->param.nChunksPerBlock);
4021 bi->hasShrinkHeader = 1;
4026 retVal = newChunkId;
4031 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
4036 /*------------------------ Short Operations Cache ----------------------------------------
4037 * In many situations where there is no high level buffering (eg WinCE) a lot of
4038 * reads might be short sequential reads, and a lot of writes may be short
4039 * sequential writes. eg. scanning/writing a jpeg file.
4040 * In these cases, a short read/write cache can provide a huge perfomance benefit
4041 * with dumb-as-a-rock code.
4042 * In Linux, the page cache provides read buffering aand the short op cache provides write
4045 * There are a limited number (~10) of cache chunks per device so that we don't
4046 * need a very intelligent search.
4049 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
4051 yaffs_Device *dev = obj->myDev;
4053 yaffs_ChunkCache *cache;
4054 int nCaches = obj->myDev->param.nShortOpCaches;
4056 for (i = 0; i < nCaches; i++) {
4057 cache = &dev->srCache[i];
4058 if (cache->object == obj &&
4067 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
4069 yaffs_Device *dev = obj->myDev;
4070 int lowest = -99; /* Stop compiler whining. */
4072 yaffs_ChunkCache *cache;
4073 int chunkWritten = 0;
4074 int nCaches = obj->myDev->param.nShortOpCaches;
4080 /* Find the dirty cache for this object with the lowest chunk id. */
4081 for (i = 0; i < nCaches; i++) {
4082 if (dev->srCache[i].object == obj &&
4083 dev->srCache[i].dirty) {
4085 || dev->srCache[i].chunkId <
4087 cache = &dev->srCache[i];
4088 lowest = cache->chunkId;
4093 if (cache && !cache->locked) {
4094 /* Write it out and free it up */
4097 yaffs_WriteChunkDataToObject(cache->object,
4103 cache->object = NULL;
4106 } while (cache && chunkWritten > 0);
4109 /* Hoosterman, disk full while writing cache out. */
4110 T(YAFFS_TRACE_ERROR,
4111 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4118 /*yaffs_FlushEntireDeviceCache(dev)
4123 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4126 int nCaches = dev->param.nShortOpCaches;
4129 /* Find a dirty object in the cache and flush it...
4130 * until there are no further dirty objects.
4134 for (i = 0; i < nCaches && !obj; i++) {
4135 if (dev->srCache[i].object &&
4136 dev->srCache[i].dirty)
4137 obj = dev->srCache[i].object;
4141 yaffs_FlushFilesChunkCache(obj);
4148 /* Grab us a cache chunk for use.
4149 * First look for an empty one.
4150 * Then look for the least recently used non-dirty one.
4151 * Then look for the least recently used dirty one...., flush and look again.
4153 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4157 if (dev->param.nShortOpCaches > 0) {
4158 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4159 if (!dev->srCache[i].object)
4160 return &dev->srCache[i];
4167 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4169 yaffs_ChunkCache *cache;
4170 yaffs_Object *theObj;
4175 if (dev->param.nShortOpCaches > 0) {
4176 /* Try find a non-dirty one... */
4178 cache = yaffs_GrabChunkCacheWorker(dev);
4181 /* They were all dirty, find the last recently used object and flush
4182 * its cache, then find again.
4183 * NB what's here is not very accurate, we actually flush the object
4184 * the last recently used page.
4187 /* With locking we can't assume we can use entry zero */
4194 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4195 if (dev->srCache[i].object &&
4196 !dev->srCache[i].locked &&
4197 (dev->srCache[i].lastUse < usage || !cache)) {
4198 usage = dev->srCache[i].lastUse;
4199 theObj = dev->srCache[i].object;
4200 cache = &dev->srCache[i];
4205 if (!cache || cache->dirty) {
4206 /* Flush and try again */
4207 yaffs_FlushFilesChunkCache(theObj);
4208 cache = yaffs_GrabChunkCacheWorker(dev);
4218 /* Find a cached chunk */
4219 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4222 yaffs_Device *dev = obj->myDev;
4224 if (dev->param.nShortOpCaches > 0) {
4225 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4226 if (dev->srCache[i].object == obj &&
4227 dev->srCache[i].chunkId == chunkId) {
4230 return &dev->srCache[i];
4237 /* Mark the chunk for the least recently used algorithym */
4238 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4242 if (dev->param.nShortOpCaches > 0) {
4243 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4244 /* Reset the cache usages */
4246 for (i = 1; i < dev->param.nShortOpCaches; i++)
4247 dev->srCache[i].lastUse = 0;
4254 cache->lastUse = dev->srLastUse;
4261 /* Invalidate a single cache page.
4262 * Do this when a whole page gets written,
4263 * ie the short cache for this page is no longer valid.
4265 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4267 if (object->myDev->param.nShortOpCaches > 0) {
4268 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4271 cache->object = NULL;
4275 /* Invalidate all the cache pages associated with this object
4276 * Do this whenever ther file is deleted or resized.
4278 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4281 yaffs_Device *dev = in->myDev;
4283 if (dev->param.nShortOpCaches > 0) {
4284 /* Invalidate it. */
4285 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4286 if (dev->srCache[i].object == in)
4287 dev->srCache[i].object = NULL;
4292 /*--------------------- Checkpointing --------------------*/
4295 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4297 yaffs_CheckpointValidity cp;
4299 memset(&cp, 0, sizeof(cp));
4301 cp.structType = sizeof(cp);
4302 cp.magic = YAFFS_MAGIC;
4303 cp.version = YAFFS_CHECKPOINT_VERSION;
4304 cp.head = (head) ? 1 : 0;
4306 return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4310 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4312 yaffs_CheckpointValidity cp;
4315 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4318 ok = (cp.structType == sizeof(cp)) &&
4319 (cp.magic == YAFFS_MAGIC) &&
4320 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4321 (cp.head == ((head) ? 1 : 0));
4325 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4328 cp->nErasedBlocks = dev->nErasedBlocks;
4329 cp->allocationBlock = dev->allocationBlock;
4330 cp->allocationPage = dev->allocationPage;
4331 cp->nFreeChunks = dev->nFreeChunks;
4333 cp->nDeletedFiles = dev->nDeletedFiles;
4334 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4335 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4336 cp->sequenceNumber = dev->sequenceNumber;
4337 cp->oldestDirtySequence = dev->oldestDirtySequence;
4341 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4342 yaffs_CheckpointDevice *cp)
4344 dev->nErasedBlocks = cp->nErasedBlocks;
4345 dev->allocationBlock = cp->allocationBlock;
4346 dev->allocationPage = cp->allocationPage;
4347 dev->nFreeChunks = cp->nFreeChunks;
4349 dev->nDeletedFiles = cp->nDeletedFiles;
4350 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4351 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4352 dev->sequenceNumber = cp->sequenceNumber;
4353 dev->oldestDirtySequence = cp->oldestDirtySequence;
4357 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4359 yaffs_CheckpointDevice cp;
4361 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4365 /* Write device runtime values*/
4366 yaffs_DeviceToCheckpointDevice(&cp, dev);
4367 cp.structType = sizeof(cp);
4369 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4371 /* Write block info */
4373 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4374 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4377 /* Write chunk bits */
4379 nBytes = nBlocks * dev->chunkBitmapStride;
4380 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4386 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4388 yaffs_CheckpointDevice cp;
4390 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4394 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4398 if (cp.structType != sizeof(cp))
4402 yaffs_CheckpointDeviceToDevice(dev, &cp);
4404 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4406 ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4410 nBytes = nBlocks * dev->chunkBitmapStride;
4412 ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4417 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4421 cp->objectId = obj->objectId;
4422 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4423 cp->hdrChunk = obj->hdrChunk;
4424 cp->variantType = obj->variantType;
4425 cp->deleted = obj->deleted;
4426 cp->softDeleted = obj->softDeleted;
4427 cp->unlinked = obj->unlinked;
4428 cp->fake = obj->fake;
4429 cp->renameAllowed = obj->renameAllowed;
4430 cp->unlinkAllowed = obj->unlinkAllowed;
4431 cp->serial = obj->serial;
4432 cp->nDataChunks = obj->nDataChunks;
4434 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4435 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4436 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4437 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4440 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4443 yaffs_Object *parent;
4445 if (obj->variantType != cp->variantType) {
4446 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4447 TCONT("chunk %d does not match existing object type %d")
4448 TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4453 obj->objectId = cp->objectId;
4456 parent = yaffs_FindOrCreateObjectByNumber(
4459 YAFFS_OBJECT_TYPE_DIRECTORY);
4464 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4465 T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4466 TCONT(" chunk %d Parent type, %d, not directory")
4468 cp->objectId, cp->parentId, cp->variantType,
4469 cp->hdrChunk, parent->variantType));
4472 yaffs_AddObjectToDirectory(parent, obj);
4475 obj->hdrChunk = cp->hdrChunk;
4476 obj->variantType = cp->variantType;
4477 obj->deleted = cp->deleted;
4478 obj->softDeleted = cp->softDeleted;
4479 obj->unlinked = cp->unlinked;
4480 obj->fake = cp->fake;
4481 obj->renameAllowed = cp->renameAllowed;
4482 obj->unlinkAllowed = cp->unlinkAllowed;
4483 obj->serial = cp->serial;
4484 obj->nDataChunks = cp->nDataChunks;
4486 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4487 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4488 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4489 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4491 if (obj->hdrChunk > 0)
4492 obj->lazyLoaded = 1;
4498 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4499 __u32 level, int chunkOffset)
4502 yaffs_Device *dev = in->myDev;
4504 int tnodeSize = yaffs_CalcTnodeSize(dev);
4509 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4510 if (tn->internal[i]) {
4511 ok = yaffs_CheckpointTnodeWorker(in,
4514 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4517 } else if (level == 0) {
4518 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4519 ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4521 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4529 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4531 __u32 endMarker = ~0;
4534 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4535 ok = yaffs_CheckpointTnodeWorker(obj,
4536 obj->variant.fileVariant.top,
4537 obj->variant.fileVariant.topLevel,
4540 ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4547 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4551 yaffs_Device *dev = obj->myDev;
4552 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4555 int tnodeSize = yaffs_CalcTnodeSize(dev);
4557 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4559 while (ok && (~baseChunk)) {
4561 /* Read level 0 tnode */
4564 tn = yaffs_GetTnodeRaw(dev);
4566 ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4571 ok = yaffs_AddOrFindLevel0Tnode(dev,
4577 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4581 T(YAFFS_TRACE_CHECKPOINT, (
4582 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4583 nread, baseChunk, ok));
4589 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4592 yaffs_CheckpointObject cp;
4595 struct ylist_head *lh;
4598 /* Iterate through the objects in each hash entry,
4599 * dumping them to the checkpointing stream.
4602 for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
4603 ylist_for_each(lh, &dev->objectBucket[i].list) {
4605 obj = ylist_entry(lh, yaffs_Object, hashLink);
4606 if (!obj->deferedFree) {
4607 yaffs_ObjectToCheckpointObject(&cp, obj);
4608 cp.structType = sizeof(cp);
4610 T(YAFFS_TRACE_CHECKPOINT, (
4611 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4612 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4614 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4616 if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4617 ok = yaffs_WriteCheckpointTnodes(obj);
4623 /* Dump end of list */
4624 memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4625 cp.structType = sizeof(cp);
4628 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4633 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4636 yaffs_CheckpointObject cp;
4639 yaffs_Object *hardList = NULL;
4641 while (ok && !done) {
4642 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4643 if (cp.structType != sizeof(cp)) {
4644 T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4645 cp.structType, (int)sizeof(cp), ok));
4649 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4650 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4652 if (ok && cp.objectId == ~0)
4655 obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4657 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4660 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4661 ok = yaffs_ReadCheckpointTnodes(obj);
4662 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4663 obj->hardLinks.next =
4664 (struct ylist_head *) hardList;
4673 yaffs_HardlinkFixup(dev, hardList);
4678 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4680 __u32 checkpointSum;
4683 yaffs_GetCheckpointSum(dev, &checkpointSum);
4685 ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4693 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4695 __u32 checkpointSum0;
4696 __u32 checkpointSum1;
4699 yaffs_GetCheckpointSum(dev, &checkpointSum0);
4701 ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4706 if (checkpointSum0 != checkpointSum1)
4713 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4717 if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
4718 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4723 ok = yaffs_CheckpointOpen(dev, 1);
4726 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4727 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4730 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4731 ok = yaffs_WriteCheckpointDevice(dev);
4734 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4735 ok = yaffs_WriteCheckpointObjects(dev);
4738 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4739 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4743 ok = yaffs_WriteCheckpointSum(dev);
4745 if (!yaffs_CheckpointClose(dev))
4749 dev->isCheckpointed = 1;
4751 dev->isCheckpointed = 0;
4753 return dev->isCheckpointed;
4756 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4760 if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) {
4761 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4766 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4769 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4770 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4773 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4774 ok = yaffs_ReadCheckpointDevice(dev);
4777 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4778 ok = yaffs_ReadCheckpointObjects(dev);
4781 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4782 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4786 ok = yaffs_ReadCheckpointSum(dev);
4787 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4790 if (!yaffs_CheckpointClose(dev))
4794 dev->isCheckpointed = 1;
4796 dev->isCheckpointed = 0;
4802 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4804 if (dev->isCheckpointed ||
4805 dev->blocksInCheckpoint > 0) {
4806 dev->isCheckpointed = 0;
4807 yaffs_CheckpointInvalidateStream(dev);
4808 if (dev->param.markSuperBlockDirty)
4809 dev->param.markSuperBlockDirty(dev);
4814 int yaffs_CheckpointSave(yaffs_Device *dev)
4817 T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4819 yaffs_VerifyObjects(dev);
4820 yaffs_VerifyBlocks(dev);
4821 yaffs_VerifyFreeChunks(dev);
4823 if (!dev->isCheckpointed) {
4824 yaffs_InvalidateCheckpoint(dev);
4825 yaffs_WriteCheckpointData(dev);
4828 T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4830 return dev->isCheckpointed;
4833 int yaffs_CheckpointRestore(yaffs_Device *dev)
4836 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4838 retval = yaffs_ReadCheckpointData(dev);
4840 if (dev->isCheckpointed) {
4841 yaffs_VerifyObjects(dev);
4842 yaffs_VerifyBlocks(dev);
4843 yaffs_VerifyFreeChunks(dev);
4846 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4851 /*--------------------- File read/write ------------------------
4852 * Read and write have very similar structures.
4853 * In general the read/write has three parts to it
4854 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4855 * Some complete chunks
4856 * An incomplete chunk to end off with
4858 * Curve-balls: the first chunk might also be the last chunk.
4861 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4870 yaffs_ChunkCache *cache;
4877 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4878 /* start = offset % dev->nDataBytesPerChunk; */
4879 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4882 /* OK now check for the curveball where the start and end are in
4885 if ((start + n) < dev->nDataBytesPerChunk)
4888 nToCopy = dev->nDataBytesPerChunk - start;
4890 cache = yaffs_FindChunkCache(in, chunk);
4892 /* If the chunk is already in the cache or it is less than a whole chunk
4893 * or we're using inband tags then use the cache (if there is caching)
4894 * else bypass the cache.
4896 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
4897 if (dev->param.nShortOpCaches > 0) {
4899 /* If we can't find the data in the cache, then load it up. */
4902 cache = yaffs_GrabChunkCache(in->myDev);
4904 cache->chunkId = chunk;
4907 yaffs_ReadChunkDataFromObject(in, chunk,
4913 yaffs_UseChunkCache(dev, cache, 0);
4918 memcpy(buffer, &cache->data[start], nToCopy);
4922 /* Read into the local buffer then copy..*/
4925 yaffs_GetTempBuffer(dev, __LINE__);
4926 yaffs_ReadChunkDataFromObject(in, chunk,
4929 memcpy(buffer, &localBuffer[start], nToCopy);
4932 yaffs_ReleaseTempBuffer(dev, localBuffer,
4938 /* A full chunk. Read directly into the supplied buffer. */
4939 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4953 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4954 int nBytes, int writeThrough)
4963 int startOfWrite = offset;
4964 int chunkWritten = 0;
4972 while (n > 0 && chunkWritten >= 0) {
4973 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4974 /* start = offset % dev->nDataBytesPerChunk; */
4975 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4977 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4978 start >= dev->nDataBytesPerChunk) {
4979 T(YAFFS_TRACE_ERROR, (
4980 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4982 (int)offset, chunk, start));
4986 /* OK now check for the curveball where the start and end are in
4990 if ((start + n) < dev->nDataBytesPerChunk) {
4993 /* Now folks, to calculate how many bytes to write back....
4994 * If we're overwriting and not writing to then end of file then
4995 * we need to write back as much as was there before.
4998 chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
5000 if (chunkStart > in->variant.fileVariant.fileSize)
5001 nBytesRead = 0; /* Past end of file */
5003 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
5005 if (nBytesRead > dev->nDataBytesPerChunk)
5006 nBytesRead = dev->nDataBytesPerChunk;
5010 (start + n)) ? nBytesRead : (start + n);
5012 if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
5016 nToCopy = dev->nDataBytesPerChunk - start;
5017 nToWriteBack = dev->nDataBytesPerChunk;
5020 if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5021 /* An incomplete start or end chunk (or maybe both start and end chunk),
5022 * or we're using inband tags, so we want to use the cache buffers.
5024 if (dev->param.nShortOpCaches > 0) {
5025 yaffs_ChunkCache *cache;
5026 /* If we can't find the data in the cache, then load the cache */
5027 cache = yaffs_FindChunkCache(in, chunk);
5030 && yaffs_CheckSpaceForAllocation(in->
5032 cache = yaffs_GrabChunkCache(in->myDev);
5034 cache->chunkId = chunk;
5037 yaffs_ReadChunkDataFromObject(in, chunk,
5042 !yaffs_CheckSpaceForAllocation(in->myDev)) {
5043 /* Drop the cache if it was a read cache item and
5044 * no space check has been made for it.
5050 yaffs_UseChunkCache(dev, cache, 1);
5054 memcpy(&cache->data[start], buffer,
5059 cache->nBytes = nToWriteBack;
5063 yaffs_WriteChunkDataToObject
5066 cache->data, cache->nBytes,
5072 chunkWritten = -1; /* fail the write */
5075 /* An incomplete start or end chunk (or maybe both start and end chunk)
5076 * Read into the local buffer then copy, then copy over and write back.
5080 yaffs_GetTempBuffer(dev, __LINE__);
5082 yaffs_ReadChunkDataFromObject(in, chunk,
5087 memcpy(&localBuffer[start], buffer, nToCopy);
5090 yaffs_WriteChunkDataToObject(in, chunk,
5095 yaffs_ReleaseTempBuffer(dev, localBuffer,
5101 /* A full chunk. Write directly from the supplied buffer. */
5106 yaffs_WriteChunkDataToObject(in, chunk, buffer,
5107 dev->nDataBytesPerChunk,
5110 /* Since we've overwritten the cached data, we better invalidate it. */
5111 yaffs_InvalidateChunkCache(in, chunk);
5114 if (chunkWritten >= 0) {
5123 /* Update file object */
5125 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5126 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5134 /* ---------------------- File resizing stuff ------------------ */
5136 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5139 yaffs_Device *dev = in->myDev;
5140 int oldFileSize = in->variant.fileVariant.fileSize;
5142 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5144 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5145 dev->nDataBytesPerChunk;
5149 /* Delete backwards so that we don't end up with holes if
5150 * power is lost part-way through the operation.
5152 for (i = lastDel; i >= startDel; i--) {
5153 /* NB this could be optimised somewhat,
5154 * eg. could retrieve the tags and write them without
5155 * using yaffs_DeleteChunk
5158 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5161 (dev->internalStartBlock * dev->param.nChunksPerBlock)
5163 ((dev->internalEndBlock +
5164 1) * dev->param.nChunksPerBlock)) {
5165 T(YAFFS_TRACE_ALWAYS,
5166 (TSTR("Found daft chunkId %d for %d" TENDSTR),
5170 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5177 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5180 int oldFileSize = in->variant.fileVariant.fileSize;
5181 __u32 newSizeOfPartialChunk;
5184 yaffs_Device *dev = in->myDev;
5186 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5188 yaffs_FlushFilesChunkCache(in);
5189 yaffs_InvalidateWholeChunkCache(in);
5191 yaffs_CheckGarbageCollection(dev);
5193 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5196 if (newSize == oldFileSize)
5199 if (newSize < oldFileSize) {
5201 yaffs_PruneResizedChunks(in, newSize);
5203 if (newSizeOfPartialChunk != 0) {
5204 int lastChunk = 1 + newFullChunks;
5206 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5208 /* Got to read and rewrite the last chunk with its new size and zero pad */
5209 yaffs_ReadChunkDataFromObject(in, lastChunk,
5212 memset(localBuffer + newSizeOfPartialChunk, 0,
5213 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5215 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5216 newSizeOfPartialChunk, 1);
5218 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5221 in->variant.fileVariant.fileSize = newSize;
5223 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5225 /* newsSize > oldFileSize */
5226 in->variant.fileVariant.fileSize = newSize;
5230 /* Write a new object header to reflect the resize.
5231 * show we've shrunk the file, if need be
5232 * Do this only if the file is not in the deleted directories
5233 * and is not shadowed.
5237 in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5238 in->parent->objectId != YAFFS_OBJECTID_DELETED)
5239 yaffs_UpdateObjectHeader(in, NULL, 0,
5240 (newSize < oldFileSize) ? 1 : 0, 0);
5245 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5247 YCHAR *alias = NULL;
5248 obj = yaffs_GetEquivalentObject(obj);
5250 switch (obj->variantType) {
5251 case YAFFS_OBJECT_TYPE_FILE:
5252 return obj->variant.fileVariant.fileSize;
5253 case YAFFS_OBJECT_TYPE_SYMLINK:
5254 alias = obj->variant.symLinkVariant.alias;
5257 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5265 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5269 yaffs_FlushFilesChunkCache(in);
5270 if(dataSync) /* Only sync data */
5274 #ifdef CONFIG_YAFFS_WINCE
5275 yfsd_WinFileTimeNow(in->win_mtime);
5278 in->yst_mtime = Y_CURRENT_TIME;
5283 retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5284 0) ? YAFFS_OK : YAFFS_FAIL;
5294 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5297 /* First off, invalidate the file's data in the cache, without flushing. */
5298 yaffs_InvalidateWholeChunkCache(in);
5300 if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5301 /* Move to the unlinked directory so we have a record that it was deleted. */
5302 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5306 yaffs_RemoveObjectFromDirectory(in);
5307 yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5310 yaffs_FreeObject(in);
5315 /* yaffs_DeleteFile deletes the whole file data
5316 * and the inode associated with the file.
5317 * It does not delete the links associated with the file.
5319 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5323 int immediateDeletion = 0;
5326 immediateDeletion = 1;
5328 if (immediateDeletion) {
5330 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5331 _Y("deleted"), 0, 0);
5332 T(YAFFS_TRACE_TRACING,
5333 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5336 in->myDev->nDeletedFiles++;
5337 if (1 || in->myDev->param.isYaffs2)
5338 yaffs_ResizeFile(in, 0);
5339 yaffs_SoftDeleteFile(in);
5342 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5343 _Y("unlinked"), 0, 0);
5350 int yaffs_DeleteFile(yaffs_Object *in)
5352 int retVal = YAFFS_OK;
5353 int deleted = in->deleted;
5355 yaffs_ResizeFile(in, 0);
5357 if (in->nDataChunks > 0) {
5358 /* Use soft deletion if there is data in the file.
5359 * That won't be the case if it has been resized to zero.
5362 retVal = yaffs_UnlinkFileIfNeeded(in);
5364 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5367 in->myDev->nDeletedFiles++;
5368 yaffs_SoftDeleteFile(in);
5370 return deleted ? YAFFS_OK : YAFFS_FAIL;
5372 /* The file has no data chunks so we toss it immediately */
5373 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5374 in->variant.fileVariant.top = NULL;
5375 yaffs_DoGenericObjectDeletion(in);
5381 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5383 return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5384 !(ylist_empty(&obj->variant.directoryVariant.children));
5387 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5389 /* First check that the directory is empty. */
5390 if (yaffs_IsNonEmptyDirectory(obj))
5393 return yaffs_DoGenericObjectDeletion(obj);
5396 static int yaffs_DeleteSymLink(yaffs_Object *in)
5398 if(in->variant.symLinkVariant.alias)
5399 YFREE(in->variant.symLinkVariant.alias);
5400 in->variant.symLinkVariant.alias=NULL;
5402 return yaffs_DoGenericObjectDeletion(in);
5405 static int yaffs_DeleteHardLink(yaffs_Object *in)
5407 /* remove this hardlink from the list assocaited with the equivalent
5410 ylist_del_init(&in->hardLinks);
5411 return yaffs_DoGenericObjectDeletion(in);
5414 int yaffs_DeleteObject(yaffs_Object *obj)
5417 switch (obj->variantType) {
5418 case YAFFS_OBJECT_TYPE_FILE:
5419 retVal = yaffs_DeleteFile(obj);
5421 case YAFFS_OBJECT_TYPE_DIRECTORY:
5422 return yaffs_DeleteDirectory(obj);
5424 case YAFFS_OBJECT_TYPE_SYMLINK:
5425 retVal = yaffs_DeleteSymLink(obj);
5427 case YAFFS_OBJECT_TYPE_HARDLINK:
5428 retVal = yaffs_DeleteHardLink(obj);
5430 case YAFFS_OBJECT_TYPE_SPECIAL:
5431 retVal = yaffs_DoGenericObjectDeletion(obj);
5433 case YAFFS_OBJECT_TYPE_UNKNOWN:
5435 break; /* should not happen. */
5441 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5444 int immediateDeletion = 0;
5447 immediateDeletion = 1;
5450 yaffs_UpdateParent(obj->parent);
5452 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5453 return yaffs_DeleteHardLink(obj);
5454 } else if (!ylist_empty(&obj->hardLinks)) {
5455 /* Curve ball: We're unlinking an object that has a hardlink.
5457 * This problem arises because we are not strictly following
5458 * The Linux link/inode model.
5460 * We can't really delete the object.
5461 * Instead, we do the following:
5462 * - Select a hardlink.
5463 * - Unhook it from the hard links
5464 * - Move it from its parent directory (so that the rename can work)
5465 * - Rename the object to the hardlink's name.
5466 * - Delete the hardlink
5470 yaffs_Object *parent;
5472 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5474 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5476 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5477 parent = hl->parent;
5479 ylist_del_init(&hl->hardLinks);
5481 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5483 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5485 if (retVal == YAFFS_OK)
5486 retVal = yaffs_DoGenericObjectDeletion(hl);
5490 } else if (immediateDeletion) {
5491 switch (obj->variantType) {
5492 case YAFFS_OBJECT_TYPE_FILE:
5493 return yaffs_DeleteFile(obj);
5495 case YAFFS_OBJECT_TYPE_DIRECTORY:
5496 return yaffs_DeleteDirectory(obj);
5498 case YAFFS_OBJECT_TYPE_SYMLINK:
5499 return yaffs_DeleteSymLink(obj);
5501 case YAFFS_OBJECT_TYPE_SPECIAL:
5502 return yaffs_DoGenericObjectDeletion(obj);
5504 case YAFFS_OBJECT_TYPE_HARDLINK:
5505 case YAFFS_OBJECT_TYPE_UNKNOWN:
5509 } else if(yaffs_IsNonEmptyDirectory(obj))
5512 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5513 _Y("unlinked"), 0, 0);
5517 static int yaffs_UnlinkObject(yaffs_Object *obj)
5520 if (obj && obj->unlinkAllowed)
5521 return yaffs_UnlinkWorker(obj);
5526 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5530 obj = yaffs_FindObjectByName(dir, name);
5531 return yaffs_UnlinkObject(obj);
5534 /*----------------------- Initialisation Scanning ---------------------- */
5536 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5537 int backwardScanning)
5541 if (!backwardScanning) {
5542 /* Handle YAFFS1 forward scanning case
5543 * For YAFFS1 we always do the deletion
5547 /* Handle YAFFS2 case (backward scanning)
5548 * If the shadowed object exists then ignore.
5550 obj = yaffs_FindObjectByNumber(dev, objId);
5555 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5556 * We put it in unlinked dir to be cleaned up after the scanning
5559 yaffs_FindOrCreateObjectByNumber(dev, objId,
5560 YAFFS_OBJECT_TYPE_FILE);
5563 obj->isShadowed = 1;
5564 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5565 obj->variant.fileVariant.shrinkSize = 0;
5566 obj->valid = 1; /* So that we don't read any other info for this file */
5576 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5583 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5585 in = yaffs_FindObjectByNumber(dev,
5586 hl->variant.hardLinkVariant.
5587 equivalentObjectId);
5590 /* Add the hardlink pointers */
5591 hl->variant.hardLinkVariant.equivalentObject = in;
5592 ylist_add(&hl->hardLinks, &in->hardLinks);
5594 /* Todo Need to report/handle this better.
5595 * Got a problem... hardlink to a non-existant object
5597 hl->variant.hardLinkVariant.equivalentObject = NULL;
5598 YINIT_LIST_HEAD(&hl->hardLinks);
5608 static int ybicmp(const void *a, const void *b)
5610 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5611 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5612 register int ablock = ((yaffs_BlockIndex *)a)->block;
5613 register int bblock = ((yaffs_BlockIndex *)b)->block;
5615 return ablock - bblock;
5621 struct yaffs_ShadowFixerStruct {
5624 struct yaffs_ShadowFixerStruct *next;
5628 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5631 * Sort out state of unlinked and deleted objects after scanning.
5633 struct ylist_head *i;
5634 struct ylist_head *n;
5637 /* Soft delete all the unlinked files */
5638 ylist_for_each_safe(i, n,
5639 &dev->unlinkedDir->variant.directoryVariant.children) {
5641 l = ylist_entry(i, yaffs_Object, siblings);
5642 yaffs_DeleteObject(l);
5646 ylist_for_each_safe(i, n,
5647 &dev->deletedDir->variant.directoryVariant.children) {
5649 l = ylist_entry(i, yaffs_Object, siblings);
5650 yaffs_DeleteObject(l);
5657 * This code iterates through all the objects making sure that they are rooted.
5658 * Any unrooted objects are re-rooted in lost+found.
5659 * An object needs to be in one of:
5660 * - Directly under deleted, unlinked
5661 * - Directly or indirectly under root.
5664 * This code assumes that we don't ever change the current relationships between
5666 * rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5667 * lostNfound->parent == rootDir
5669 * This fixes the problem where directories might have inadvertently been deleted
5670 * leaving the object "hanging" without being rooted in the directory tree.
5673 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5675 return (obj == dev->deletedDir ||
5676 obj == dev->unlinkedDir||
5677 obj == dev->rootDir);
5680 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5683 yaffs_Object *parent;
5685 struct ylist_head *lh;
5686 struct ylist_head *n;
5691 /* Iterate through the objects in each hash entry,
5692 * looking at each object.
5693 * Make sure it is rooted.
5696 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
5697 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5699 obj = ylist_entry(lh, yaffs_Object, hashLink);
5700 parent= obj->parent;
5702 if(yaffs_HasNULLParent(dev,obj)){
5703 /* These directories are not hanging */
5706 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5708 else if(yaffs_HasNULLParent(dev,parent))
5712 * Need to follow the parent chain to see if it is hanging.
5717 while(parent != dev->rootDir &&
5719 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5721 parent = parent->parent;
5724 if(parent != dev->rootDir)
5729 (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5731 yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5740 * Delete directory contents for cleaning up lost and found.
5742 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
5745 struct ylist_head *lh;
5746 struct ylist_head *n;
5748 if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5751 ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
5753 obj = ylist_entry(lh, yaffs_Object, siblings);
5754 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
5755 yaffs_DeleteDirectoryContents(obj);
5758 (TSTR("Deleting lost_found object %d" TENDSTR),
5761 /* Need to use UnlinkObject since Delete would not handle
5762 * hardlinked objects correctly.
5764 yaffs_UnlinkObject(obj);
5770 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
5772 yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
5775 static int yaffs_Scan(yaffs_Device *dev)
5777 yaffs_ExtendedTags tags;
5787 yaffs_BlockState state;
5788 yaffs_Object *hardList = NULL;
5789 yaffs_BlockInfo *bi;
5790 __u32 sequenceNumber;
5791 yaffs_ObjectHeader *oh;
5793 yaffs_Object *parent;
5795 int alloc_failed = 0;
5797 struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5805 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5806 dev->internalStartBlock, dev->internalEndBlock));
5808 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5810 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5812 /* Scan all the blocks to determine their state */
5813 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5814 bi = yaffs_GetBlockInfo(dev, blk);
5815 yaffs_ClearChunkBits(dev, blk);
5817 bi->softDeletions = 0;
5819 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5821 bi->blockState = state;
5822 bi->sequenceNumber = sequenceNumber;
5824 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5825 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5827 T(YAFFS_TRACE_SCAN_DEBUG,
5828 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5829 state, sequenceNumber));
5831 if (state == YAFFS_BLOCK_STATE_DEAD) {
5832 T(YAFFS_TRACE_BAD_BLOCKS,
5833 (TSTR("block %d is bad" TENDSTR), blk));
5834 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5835 T(YAFFS_TRACE_SCAN_DEBUG,
5836 (TSTR("Block empty " TENDSTR)));
5837 dev->nErasedBlocks++;
5838 dev->nFreeChunks += dev->param.nChunksPerBlock;
5842 startIterator = dev->internalStartBlock;
5843 endIterator = dev->internalEndBlock;
5845 /* For each block.... */
5846 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5853 blk = blockIterator;
5855 bi = yaffs_GetBlockInfo(dev, blk);
5856 state = bi->blockState;
5860 /* For each chunk in each block that needs scanning....*/
5861 for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
5862 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5863 /* Read the tags and decide what to do */
5864 chunk = blk * dev->param.nChunksPerBlock + c;
5866 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5869 /* Let's have a good look at this chunk... */
5871 if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5877 /*T((" %d %d deleted\n",blk,c)); */
5878 } else if (!tags.chunkUsed) {
5879 /* An unassigned chunk in the block
5880 * This means that either the block is empty or
5881 * this is the one being allocated from
5885 /* We're looking at the first chunk in the block so the block is unused */
5886 state = YAFFS_BLOCK_STATE_EMPTY;
5887 dev->nErasedBlocks++;
5889 /* this is the block being allocated from */
5892 (" Allocating from %d %d" TENDSTR),
5894 state = YAFFS_BLOCK_STATE_ALLOCATING;
5895 dev->allocationBlock = blk;
5896 dev->allocationPage = c;
5897 dev->allocationBlockFinder = blk;
5898 /* Set block finder here to encourage the allocator to go forth from here. */
5902 dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
5903 } else if (tags.chunkId > 0) {
5904 /* chunkId > 0 so it is a data chunk... */
5905 unsigned int endpos;
5907 yaffs_SetChunkBit(dev, blk, c);
5910 in = yaffs_FindOrCreateObjectByNumber(dev,
5913 YAFFS_OBJECT_TYPE_FILE);
5914 /* PutChunkIntoFile checks for a clash (two data chunks with
5915 * the same chunkId).
5922 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5927 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5930 in->variantType == YAFFS_OBJECT_TYPE_FILE
5931 && in->variant.fileVariant.scannedFileSize <
5933 in->variant.fileVariant.
5934 scannedFileSize = endpos;
5935 if (!dev->param.useHeaderFileSize) {
5936 in->variant.fileVariant.
5938 in->variant.fileVariant.
5943 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5945 /* chunkId == 0, so it is an ObjectHeader.
5946 * Thus, we read in the object header and make the object
5948 yaffs_SetChunkBit(dev, blk, c);
5951 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5955 oh = (yaffs_ObjectHeader *) chunkData;
5957 in = yaffs_FindObjectByNumber(dev,
5959 if (in && in->variantType != oh->type) {
5960 /* This should not happen, but somehow
5961 * Wev'e ended up with an objectId that has been reused but not yet
5962 * deleted, and worse still it has changed type. Delete the old object.
5965 yaffs_DeleteObject(in);
5970 in = yaffs_FindOrCreateObjectByNumber(dev,
5978 if (in && oh->shadowsObject > 0) {
5980 struct yaffs_ShadowFixerStruct *fixer;
5981 fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5983 fixer->next = shadowFixerList;
5984 shadowFixerList = fixer;
5985 fixer->objectId = tags.objectId;
5986 fixer->shadowedId = oh->shadowsObject;
5991 if (in && in->valid) {
5992 /* We have already filled this one. We have a duplicate and need to resolve it. */
5994 unsigned existingSerial = in->serial;
5995 unsigned newSerial = tags.serialNumber;
5997 if (((existingSerial + 1) & 3) == newSerial) {
5998 /* Use new one - destroy the exisiting one */
5999 yaffs_DeleteChunk(dev,
6004 /* Use existing - destroy this one. */
6005 yaffs_DeleteChunk(dev, chunk, 1,
6010 if (in && !in->valid &&
6011 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6012 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
6013 /* We only load some info, don't fiddle with directory structure */
6015 in->variantType = oh->type;
6017 in->yst_mode = oh->yst_mode;
6018 #ifdef CONFIG_YAFFS_WINCE
6019 in->win_atime[0] = oh->win_atime[0];
6020 in->win_ctime[0] = oh->win_ctime[0];
6021 in->win_mtime[0] = oh->win_mtime[0];
6022 in->win_atime[1] = oh->win_atime[1];
6023 in->win_ctime[1] = oh->win_ctime[1];
6024 in->win_mtime[1] = oh->win_mtime[1];
6026 in->yst_uid = oh->yst_uid;
6027 in->yst_gid = oh->yst_gid;
6028 in->yst_atime = oh->yst_atime;
6029 in->yst_mtime = oh->yst_mtime;
6030 in->yst_ctime = oh->yst_ctime;
6031 in->yst_rdev = oh->yst_rdev;
6033 in->hdrChunk = chunk;
6034 in->serial = tags.serialNumber;
6036 } else if (in && !in->valid) {
6037 /* we need to load this info */
6040 in->variantType = oh->type;
6042 in->yst_mode = oh->yst_mode;
6043 #ifdef CONFIG_YAFFS_WINCE
6044 in->win_atime[0] = oh->win_atime[0];
6045 in->win_ctime[0] = oh->win_ctime[0];
6046 in->win_mtime[0] = oh->win_mtime[0];
6047 in->win_atime[1] = oh->win_atime[1];
6048 in->win_ctime[1] = oh->win_ctime[1];
6049 in->win_mtime[1] = oh->win_mtime[1];
6051 in->yst_uid = oh->yst_uid;
6052 in->yst_gid = oh->yst_gid;
6053 in->yst_atime = oh->yst_atime;
6054 in->yst_mtime = oh->yst_mtime;
6055 in->yst_ctime = oh->yst_ctime;
6056 in->yst_rdev = oh->yst_rdev;
6058 in->hdrChunk = chunk;
6059 in->serial = tags.serialNumber;
6061 yaffs_SetObjectName(in, oh->name);
6064 /* directory stuff...
6069 yaffs_FindOrCreateObjectByNumber
6070 (dev, oh->parentObjectId,
6071 YAFFS_OBJECT_TYPE_DIRECTORY);
6074 if (parent && parent->variantType ==
6075 YAFFS_OBJECT_TYPE_UNKNOWN) {
6076 /* Set up as a directory */
6077 parent->variantType =
6078 YAFFS_OBJECT_TYPE_DIRECTORY;
6079 YINIT_LIST_HEAD(&parent->variant.
6082 } else if (!parent || parent->variantType !=
6083 YAFFS_OBJECT_TYPE_DIRECTORY) {
6084 /* Hoosterman, another problem....
6085 * We're trying to use a non-directory as a directory
6088 T(YAFFS_TRACE_ERROR,
6090 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6092 parent = dev->lostNFoundDir;
6095 yaffs_AddObjectToDirectory(parent, in);
6097 if (0 && (parent == dev->deletedDir ||
6098 parent == dev->unlinkedDir)) {
6099 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
6100 dev->nDeletedFiles++;
6102 /* Note re hardlinks.
6103 * Since we might scan a hardlink before its equivalent object is scanned
6104 * we put them all in a list.
6105 * After scanning is complete, we should have all the objects, so we run through this
6106 * list and fix up all the chains.
6109 switch (in->variantType) {
6110 case YAFFS_OBJECT_TYPE_UNKNOWN:
6111 /* Todo got a problem */
6113 case YAFFS_OBJECT_TYPE_FILE:
6114 if (dev->param.useHeaderFileSize)
6116 in->variant.fileVariant.
6121 case YAFFS_OBJECT_TYPE_HARDLINK:
6122 in->variant.hardLinkVariant.
6123 equivalentObjectId =
6124 oh->equivalentObjectId;
6125 in->hardLinks.next =
6126 (struct ylist_head *)
6130 case YAFFS_OBJECT_TYPE_DIRECTORY:
6133 case YAFFS_OBJECT_TYPE_SPECIAL:
6136 case YAFFS_OBJECT_TYPE_SYMLINK:
6137 in->variant.symLinkVariant.alias =
6138 yaffs_CloneString(oh->alias);
6139 if (!in->variant.symLinkVariant.alias)
6148 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6149 /* If we got this far while scanning, then the block is fully allocated.*/
6150 state = YAFFS_BLOCK_STATE_FULL;
6153 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6154 /* If the block was partially allocated then treat it as fully allocated.*/
6155 state = YAFFS_BLOCK_STATE_FULL;
6156 dev->allocationBlock = -1;
6159 bi->blockState = state;
6161 /* Now let's see if it was dirty */
6162 if (bi->pagesInUse == 0 &&
6163 !bi->hasShrinkHeader &&
6164 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6165 yaffs_BlockBecameDirty(dev, blk);
6171 /* Ok, we've done all the scanning.
6172 * Fix up the hard link chains.
6173 * We should now have scanned all the objects, now it's time to add these
6177 yaffs_HardlinkFixup(dev, hardList);
6179 /* Fix up any shadowed objects */
6181 struct yaffs_ShadowFixerStruct *fixer;
6184 while (shadowFixerList) {
6185 fixer = shadowFixerList;
6186 shadowFixerList = fixer->next;
6187 /* Complete the rename transaction by deleting the shadowed object
6188 * then setting the object header to unshadowed.
6190 obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6192 yaffs_DeleteObject(obj);
6194 obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6197 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6203 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6208 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6214 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6217 yaffs_ObjectHeader *oh;
6219 yaffs_ExtendedTags tags;
6221 int alloc_failed = 0;
6229 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6231 in->lazyLoaded ? "not yet" : "already"));
6234 if (in->lazyLoaded && in->hdrChunk > 0) {
6236 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6238 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6239 oh = (yaffs_ObjectHeader *) chunkData;
6241 in->yst_mode = oh->yst_mode;
6242 #ifdef CONFIG_YAFFS_WINCE
6243 in->win_atime[0] = oh->win_atime[0];
6244 in->win_ctime[0] = oh->win_ctime[0];
6245 in->win_mtime[0] = oh->win_mtime[0];
6246 in->win_atime[1] = oh->win_atime[1];
6247 in->win_ctime[1] = oh->win_ctime[1];
6248 in->win_mtime[1] = oh->win_mtime[1];
6250 in->yst_uid = oh->yst_uid;
6251 in->yst_gid = oh->yst_gid;
6252 in->yst_atime = oh->yst_atime;
6253 in->yst_mtime = oh->yst_mtime;
6254 in->yst_ctime = oh->yst_ctime;
6255 in->yst_rdev = oh->yst_rdev;
6258 yaffs_SetObjectName(in, oh->name);
6260 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6261 in->variant.symLinkVariant.alias =
6262 yaffs_CloneString(oh->alias);
6263 if (!in->variant.symLinkVariant.alias)
6264 alloc_failed = 1; /* Not returned to caller */
6267 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6271 static int yaffs_ScanBackwards(yaffs_Device *dev)
6273 yaffs_ExtendedTags tags;
6278 int nBlocksToScan = 0;
6284 yaffs_BlockState state;
6285 yaffs_Object *hardList = NULL;
6286 yaffs_BlockInfo *bi;
6287 __u32 sequenceNumber;
6288 yaffs_ObjectHeader *oh;
6290 yaffs_Object *parent;
6291 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6297 int foundChunksInBlock;
6298 int equivalentObjectId;
6299 int alloc_failed = 0;
6302 yaffs_BlockIndex *blockIndex = NULL;
6303 int altBlockIndex = 0;
6305 if (!dev->param.isYaffs2) {
6307 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6313 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
6314 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6317 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6319 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6322 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6328 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6332 dev->blocksInCheckpoint = 0;
6334 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6336 /* Scan all the blocks to determine their state */
6337 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6338 bi = yaffs_GetBlockInfo(dev, blk);
6339 yaffs_ClearChunkBits(dev, blk);
6341 bi->softDeletions = 0;
6343 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6345 bi->blockState = state;
6346 bi->sequenceNumber = sequenceNumber;
6348 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6349 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6350 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6351 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6353 T(YAFFS_TRACE_SCAN_DEBUG,
6354 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6355 state, sequenceNumber));
6358 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6359 dev->blocksInCheckpoint++;
6361 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6362 T(YAFFS_TRACE_BAD_BLOCKS,
6363 (TSTR("block %d is bad" TENDSTR), blk));
6364 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6365 T(YAFFS_TRACE_SCAN_DEBUG,
6366 (TSTR("Block empty " TENDSTR)));
6367 dev->nErasedBlocks++;
6368 dev->nFreeChunks += dev->param.nChunksPerBlock;
6369 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6371 /* Determine the highest sequence number */
6372 if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6373 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6375 blockIndex[nBlocksToScan].seq = sequenceNumber;
6376 blockIndex[nBlocksToScan].block = blk;
6380 if (sequenceNumber >= dev->sequenceNumber)
6381 dev->sequenceNumber = sequenceNumber;
6383 /* TODO: Nasty sequence number! */
6386 ("Block scanning block %d has bad sequence number %d"
6387 TENDSTR), blk, sequenceNumber));
6394 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6400 /* Sort the blocks */
6401 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6403 /* Use qsort now. */
6404 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6408 /* Dungy old bubble sort... */
6410 yaffs_BlockIndex temp;
6414 for (i = 0; i < nBlocksToScan; i++)
6415 for (j = i + 1; j < nBlocksToScan; j++)
6416 if (blockIndex[i].seq > blockIndex[j].seq) {
6417 temp = blockIndex[j];
6418 blockIndex[j] = blockIndex[i];
6419 blockIndex[i] = temp;
6426 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6428 /* Now scan the blocks looking at the data. */
6430 endIterator = nBlocksToScan - 1;
6431 T(YAFFS_TRACE_SCAN_DEBUG,
6432 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6434 /* For each block.... backwards */
6435 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6437 /* Cooperative multitasking! This loop can run for so
6438 long that watchdog timers expire. */
6441 /* get the block to scan in the correct order */
6442 blk = blockIndex[blockIterator].block;
6444 bi = yaffs_GetBlockInfo(dev, blk);
6447 state = bi->blockState;
6451 /* For each chunk in each block that needs scanning.... */
6452 foundChunksInBlock = 0;
6453 for (c = dev->param.nChunksPerBlock - 1;
6454 !alloc_failed && c >= 0 &&
6455 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6456 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6457 /* Scan backwards...
6458 * Read the tags and decide what to do
6461 chunk = blk * dev->param.nChunksPerBlock + c;
6463 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6466 /* Let's have a good look at this chunk... */
6468 if (!tags.chunkUsed) {
6469 /* An unassigned chunk in the block.
6470 * If there are used chunks after this one, then
6471 * it is a chunk that was skipped due to failing the erased
6472 * check. Just skip it so that it can be deleted.
6473 * But, more typically, We get here when this is an unallocated
6474 * chunk and his means that either the block is empty or
6475 * this is the one being allocated from
6478 if (foundChunksInBlock) {
6479 /* This is a chunk that was skipped due to failing the erased check */
6480 } else if (c == 0) {
6481 /* We're looking at the first chunk in the block so the block is unused */
6482 state = YAFFS_BLOCK_STATE_EMPTY;
6483 dev->nErasedBlocks++;
6485 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6486 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6487 if (dev->sequenceNumber == bi->sequenceNumber) {
6488 /* this is the block being allocated from */
6492 (" Allocating from %d %d"
6495 state = YAFFS_BLOCK_STATE_ALLOCATING;
6496 dev->allocationBlock = blk;
6497 dev->allocationPage = c;
6498 dev->allocationBlockFinder = blk;
6500 /* This is a partially written block that is not
6501 * the current allocation block.
6504 T(YAFFS_TRACE_ALWAYS,
6505 (TSTR("Partially written block %d detected" TENDSTR),
6513 } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6515 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6520 } else if (tags.chunkId > 0) {
6521 /* chunkId > 0 so it is a data chunk... */
6522 unsigned int endpos;
6524 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6526 foundChunksInBlock = 1;
6529 yaffs_SetChunkBit(dev, blk, c);
6532 in = yaffs_FindOrCreateObjectByNumber(dev,
6535 YAFFS_OBJECT_TYPE_FILE);
6542 in->variantType == YAFFS_OBJECT_TYPE_FILE
6543 && chunkBase < in->variant.fileVariant.shrinkSize) {
6544 /* This has not been invalidated by a resize */
6545 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
6549 /* File size is calculated by looking at the data chunks if we have not
6550 * seen an object header yet. Stop this practice once we find an object header.
6552 endpos = chunkBase + tags.byteCount;
6554 if (!in->valid && /* have not got an object header yet */
6555 in->variant.fileVariant.scannedFileSize < endpos) {
6556 in->variant.fileVariant.scannedFileSize = endpos;
6557 in->variant.fileVariant.fileSize = endpos;
6561 /* This chunk has been invalidated by a resize, or a past file deletion
6562 * so delete the chunk*/
6563 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6567 /* chunkId == 0, so it is an ObjectHeader.
6568 * Thus, we read in the object header and make the object
6570 foundChunksInBlock = 1;
6572 yaffs_SetChunkBit(dev, blk, c);
6578 if (tags.extraHeaderInfoAvailable) {
6579 in = yaffs_FindOrCreateObjectByNumber(dev,
6581 tags.extraObjectType);
6587 (!in->valid && dev->param.disableLazyLoad) ||
6588 tags.extraShadows ||
6590 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6591 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6593 /* If we don't have valid info then we need to read the chunk
6594 * TODO In future we can probably defer reading the chunk and
6595 * living with invalid data until needed.
6598 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6603 oh = (yaffs_ObjectHeader *) chunkData;
6605 if (dev->param.inbandTags) {
6606 /* Fix up the header if they got corrupted by inband tags */
6607 oh->shadowsObject = oh->inbandShadowsObject;
6608 oh->isShrink = oh->inbandIsShrink;
6612 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6620 /* TODO Hoosterman we have a problem! */
6621 T(YAFFS_TRACE_ERROR,
6623 ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
6624 TENDSTR), tags.objectId, chunk));
6629 /* We have already filled this one.
6630 * We have a duplicate that will be discarded, but
6631 * we first have to suck out resize info if it is a file.
6634 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6636 oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6637 (tags.extraHeaderInfoAvailable &&
6638 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6640 (oh) ? oh->fileSize : tags.
6642 __u32 parentObjectId =
6644 parentObjectId : tags.
6645 extraParentObjectId;
6649 (oh) ? oh->isShrink : tags.
6650 extraIsShrinkHeader;
6652 /* If it is deleted (unlinked at start also means deleted)
6653 * we treat the file size as being zeroed at this point.
6655 if (parentObjectId ==
6656 YAFFS_OBJECTID_DELETED
6657 || parentObjectId ==
6658 YAFFS_OBJECTID_UNLINKED) {
6663 if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
6664 in->variant.fileVariant.shrinkSize = thisSize;
6667 bi->hasShrinkHeader = 1;
6670 /* Use existing - destroy this one. */
6671 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6675 if (!in->valid && in->variantType !=
6676 (oh ? oh->type : tags.extraObjectType))
6677 T(YAFFS_TRACE_ERROR, (
6678 TSTR("yaffs tragedy: Bad object type, "
6679 TCONT("%d != %d, for object %d at chunk ")
6680 TCONT("%d during scan")
6682 oh->type : tags.extraObjectType,
6683 in->variantType, tags.objectId,
6687 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6689 YAFFS_OBJECTID_LOSTNFOUND)) {
6690 /* We only load some info, don't fiddle with directory structure */
6694 in->variantType = oh->type;
6696 in->yst_mode = oh->yst_mode;
6697 #ifdef CONFIG_YAFFS_WINCE
6698 in->win_atime[0] = oh->win_atime[0];
6699 in->win_ctime[0] = oh->win_ctime[0];
6700 in->win_mtime[0] = oh->win_mtime[0];
6701 in->win_atime[1] = oh->win_atime[1];
6702 in->win_ctime[1] = oh->win_ctime[1];
6703 in->win_mtime[1] = oh->win_mtime[1];
6705 in->yst_uid = oh->yst_uid;
6706 in->yst_gid = oh->yst_gid;
6707 in->yst_atime = oh->yst_atime;
6708 in->yst_mtime = oh->yst_mtime;
6709 in->yst_ctime = oh->yst_ctime;
6710 in->yst_rdev = oh->yst_rdev;
6714 in->variantType = tags.extraObjectType;
6718 in->hdrChunk = chunk;
6720 } else if (!in->valid) {
6721 /* we need to load this info */
6724 in->hdrChunk = chunk;
6727 in->variantType = oh->type;
6729 in->yst_mode = oh->yst_mode;
6730 #ifdef CONFIG_YAFFS_WINCE
6731 in->win_atime[0] = oh->win_atime[0];
6732 in->win_ctime[0] = oh->win_ctime[0];
6733 in->win_mtime[0] = oh->win_mtime[0];
6734 in->win_atime[1] = oh->win_atime[1];
6735 in->win_ctime[1] = oh->win_ctime[1];
6736 in->win_mtime[1] = oh->win_mtime[1];
6738 in->yst_uid = oh->yst_uid;
6739 in->yst_gid = oh->yst_gid;
6740 in->yst_atime = oh->yst_atime;
6741 in->yst_mtime = oh->yst_mtime;
6742 in->yst_ctime = oh->yst_ctime;
6743 in->yst_rdev = oh->yst_rdev;
6746 if (oh->shadowsObject > 0)
6747 yaffs_HandleShadowedObject(dev,
6754 yaffs_SetObjectName(in, oh->name);
6756 yaffs_FindOrCreateObjectByNumber
6757 (dev, oh->parentObjectId,
6758 YAFFS_OBJECT_TYPE_DIRECTORY);
6760 fileSize = oh->fileSize;
6761 isShrink = oh->isShrink;
6762 equivalentObjectId = oh->equivalentObjectId;
6765 in->variantType = tags.extraObjectType;
6767 yaffs_FindOrCreateObjectByNumber
6768 (dev, tags.extraParentObjectId,
6769 YAFFS_OBJECT_TYPE_DIRECTORY);
6770 fileSize = tags.extraFileLength;
6771 isShrink = tags.extraIsShrinkHeader;
6772 equivalentObjectId = tags.extraEquivalentObjectId;
6781 /* directory stuff...
6785 if (parent && parent->variantType ==
6786 YAFFS_OBJECT_TYPE_UNKNOWN) {
6787 /* Set up as a directory */
6788 parent->variantType =
6789 YAFFS_OBJECT_TYPE_DIRECTORY;
6790 YINIT_LIST_HEAD(&parent->variant.
6793 } else if (!parent || parent->variantType !=
6794 YAFFS_OBJECT_TYPE_DIRECTORY) {
6795 /* Hoosterman, another problem....
6796 * We're trying to use a non-directory as a directory
6799 T(YAFFS_TRACE_ERROR,
6801 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6803 parent = dev->lostNFoundDir;
6806 yaffs_AddObjectToDirectory(parent, in);
6808 itsUnlinked = (parent == dev->deletedDir) ||
6809 (parent == dev->unlinkedDir);
6812 /* Mark the block as having a shrinkHeader */
6813 bi->hasShrinkHeader = 1;
6816 /* Note re hardlinks.
6817 * Since we might scan a hardlink before its equivalent object is scanned
6818 * we put them all in a list.
6819 * After scanning is complete, we should have all the objects, so we run
6820 * through this list and fix up all the chains.
6823 switch (in->variantType) {
6824 case YAFFS_OBJECT_TYPE_UNKNOWN:
6825 /* Todo got a problem */
6827 case YAFFS_OBJECT_TYPE_FILE:
6829 if (in->variant.fileVariant.
6830 scannedFileSize < fileSize) {
6831 /* This covers the case where the file size is greater
6832 * than where the data is
6833 * This will happen if the file is resized to be larger
6834 * than its current data extents.
6836 in->variant.fileVariant.fileSize = fileSize;
6837 in->variant.fileVariant.scannedFileSize = fileSize;
6840 if (in->variant.fileVariant.shrinkSize > fileSize)
6841 in->variant.fileVariant.shrinkSize = fileSize;
6845 case YAFFS_OBJECT_TYPE_HARDLINK:
6847 in->variant.hardLinkVariant.equivalentObjectId =
6849 in->hardLinks.next =
6850 (struct ylist_head *) hardList;
6854 case YAFFS_OBJECT_TYPE_DIRECTORY:
6857 case YAFFS_OBJECT_TYPE_SPECIAL:
6860 case YAFFS_OBJECT_TYPE_SYMLINK:
6862 in->variant.symLinkVariant.alias =
6863 yaffs_CloneString(oh->alias);
6864 if (!in->variant.symLinkVariant.alias)
6874 } /* End of scanning for each chunk */
6876 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6877 /* If we got this far while scanning, then the block is fully allocated. */
6878 state = YAFFS_BLOCK_STATE_FULL;
6882 bi->blockState = state;
6884 /* Now let's see if it was dirty */
6885 if (bi->pagesInUse == 0 &&
6886 !bi->hasShrinkHeader &&
6887 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6888 yaffs_BlockBecameDirty(dev, blk);
6893 yaffs_SkipRestOfBlock(dev);
6896 YFREE_ALT(blockIndex);
6900 /* Ok, we've done all the scanning.
6901 * Fix up the hard link chains.
6902 * We should now have scanned all the objects, now it's time to add these
6905 yaffs_HardlinkFixup(dev, hardList);
6908 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6913 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6918 /*------------------------------ Directory Functions ----------------------------- */
6920 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6922 struct ylist_head *lh;
6923 yaffs_Object *listObj;
6928 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6933 if (yaffs_SkipVerification(obj->myDev))
6937 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6942 if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6943 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6947 /* Iterate through the objects in each hash entry */
6949 ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6951 listObj = ylist_entry(lh, yaffs_Object, siblings);
6952 yaffs_VerifyObject(listObj);
6959 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6964 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6966 struct ylist_head *lh;
6967 yaffs_Object *listObj;
6974 if (yaffs_SkipFullVerification(directory->myDev))
6977 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6978 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6982 /* Iterate through the objects in each hash entry */
6984 ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6986 listObj = ylist_entry(lh, yaffs_Object, siblings);
6987 if (listObj->parent != directory) {
6988 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6991 yaffs_VerifyObjectInDirectory(listObj);
6997 *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6998 * link (ie. name) is created or deleted in the directory.
7001 * create dir/a : update dir's mtime/ctime
7002 * rm dir/a: update dir's mtime/ctime
7003 * modify dir/a: don't update dir's mtimme/ctime
7006 static void yaffs_UpdateParent(yaffs_Object *obj)
7012 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
7014 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7017 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
7019 yaffs_Device *dev = obj->myDev;
7020 yaffs_Object *parent;
7022 yaffs_VerifyObjectInDirectory(obj);
7023 parent = obj->parent;
7025 yaffs_VerifyDirectory(parent);
7027 if (dev && dev->param.removeObjectCallback)
7028 dev->param.removeObjectCallback(obj);
7031 ylist_del_init(&obj->siblings);
7034 yaffs_VerifyDirectory(parent);
7037 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
7041 T(YAFFS_TRACE_ALWAYS,
7043 ("tragedy: Trying to add an object to a null pointer directory"
7048 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7049 T(YAFFS_TRACE_ALWAYS,
7051 ("tragedy: Trying to add an object to a non-directory"
7056 if (obj->siblings.prev == NULL) {
7057 /* Not initialised */
7062 yaffs_VerifyDirectory(directory);
7064 yaffs_RemoveObjectFromDirectory(obj);
7068 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7069 obj->parent = directory;
7071 if (directory == obj->myDev->unlinkedDir
7072 || directory == obj->myDev->deletedDir) {
7074 obj->myDev->nUnlinkedFiles++;
7075 obj->renameAllowed = 0;
7078 yaffs_VerifyDirectory(directory);
7079 yaffs_VerifyObjectInDirectory(obj);
7082 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7087 struct ylist_head *i;
7088 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7096 T(YAFFS_TRACE_ALWAYS,
7098 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7103 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7104 T(YAFFS_TRACE_ALWAYS,
7106 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7110 sum = yaffs_CalcNameSum(name);
7112 ylist_for_each(i, &directory->variant.directoryVariant.children) {
7114 l = ylist_entry(i, yaffs_Object, siblings);
7116 if (l->parent != directory)
7119 yaffs_CheckObjectDetailsLoaded(l);
7121 /* Special case for lost-n-found */
7122 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7123 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7125 } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7126 /* LostnFound chunk called Objxxx
7129 yaffs_GetObjectName(l, buffer,
7130 YAFFS_MAX_NAME_LENGTH + 1);
7131 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7142 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7143 int (*fn) (yaffs_Object *))
7145 struct ylist_head *i;
7149 T(YAFFS_TRACE_ALWAYS,
7151 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7156 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7157 T(YAFFS_TRACE_ALWAYS,
7159 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7164 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7166 l = ylist_entry(i, yaffs_Object, siblings);
7177 /* GetEquivalentObject dereferences any hard links to get to the
7181 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7183 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7184 /* We want the object id of the equivalent object, not this one */
7185 obj = obj->variant.hardLinkVariant.equivalentObject;
7186 yaffs_CheckObjectDetailsLoaded(obj);
7191 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7193 memset(name, 0, buffSize * sizeof(YCHAR));
7195 yaffs_CheckObjectDetailsLoaded(obj);
7197 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7198 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7199 } else if (obj->hdrChunk <= 0) {
7201 YCHAR numString[20];
7202 YCHAR *x = &numString[19];
7203 unsigned v = obj->objectId;
7207 *x = '0' + (v % 10);
7210 /* make up a name */
7211 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7212 yaffs_strcat(locName, x);
7213 yaffs_strncpy(name, locName, buffSize - 1);
7216 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7217 else if (obj->shortName[0])
7218 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7222 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7224 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7226 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7228 if (obj->hdrChunk > 0) {
7229 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7230 obj->hdrChunk, buffer,
7233 yaffs_strncpy(name, oh->name, buffSize - 1);
7236 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7239 return yaffs_strnlen(name,buffSize-1);
7242 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7244 /* Dereference any hard linking */
7245 obj = yaffs_GetEquivalentObject(obj);
7247 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7248 return obj->variant.fileVariant.fileSize;
7249 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7250 if(!obj->variant.symLinkVariant.alias)
7252 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7254 /* Only a directory should drop through to here */
7255 return obj->myDev->nDataBytesPerChunk;
7259 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7262 struct ylist_head *i;
7265 count++; /* the object itself */
7267 ylist_for_each(i, &obj->hardLinks)
7268 count++; /* add the hard links; */
7273 int yaffs_GetObjectInode(yaffs_Object *obj)
7275 obj = yaffs_GetEquivalentObject(obj);
7277 return obj->objectId;
7280 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7282 obj = yaffs_GetEquivalentObject(obj);
7284 switch (obj->variantType) {
7285 case YAFFS_OBJECT_TYPE_FILE:
7288 case YAFFS_OBJECT_TYPE_DIRECTORY:
7291 case YAFFS_OBJECT_TYPE_SYMLINK:
7294 case YAFFS_OBJECT_TYPE_HARDLINK:
7297 case YAFFS_OBJECT_TYPE_SPECIAL:
7298 if (S_ISFIFO(obj->yst_mode))
7300 if (S_ISCHR(obj->yst_mode))
7302 if (S_ISBLK(obj->yst_mode))
7304 if (S_ISSOCK(obj->yst_mode))
7312 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7314 obj = yaffs_GetEquivalentObject(obj);
7315 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7316 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7318 return yaffs_CloneString(_Y(""));
7321 #ifndef CONFIG_YAFFS_WINCE
7323 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7325 unsigned int valid = attr->ia_valid;
7327 if (valid & ATTR_MODE)
7328 obj->yst_mode = attr->ia_mode;
7329 if (valid & ATTR_UID)
7330 obj->yst_uid = attr->ia_uid;
7331 if (valid & ATTR_GID)
7332 obj->yst_gid = attr->ia_gid;
7334 if (valid & ATTR_ATIME)
7335 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7336 if (valid & ATTR_CTIME)
7337 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7338 if (valid & ATTR_MTIME)
7339 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7341 if (valid & ATTR_SIZE)
7342 yaffs_ResizeFile(obj, attr->ia_size);
7344 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7349 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7351 unsigned int valid = 0;
7353 attr->ia_mode = obj->yst_mode;
7355 attr->ia_uid = obj->yst_uid;
7357 attr->ia_gid = obj->yst_gid;
7360 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7361 valid |= ATTR_ATIME;
7362 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7363 valid |= ATTR_CTIME;
7364 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7365 valid |= ATTR_MTIME;
7367 attr->ia_size = yaffs_GetFileSize(obj);
7370 attr->ia_valid = valid;
7378 int yaffs_DumpObject(yaffs_Object *obj)
7382 yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7384 T(YAFFS_TRACE_ALWAYS,
7386 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7387 " chunk %d type %d size %d\n"
7388 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7389 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7390 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7396 /*---------------------------- Initialisation code -------------------------------------- */
7398 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7401 /* Common functions, gotta have */
7402 if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
7405 #ifdef CONFIG_YAFFS_YAFFS2
7407 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7408 if (dev->param.writeChunkWithTagsToNAND &&
7409 dev->param.readChunkWithTagsFromNAND &&
7410 !dev->param.writeChunkToNAND &&
7411 !dev->param.readChunkFromNAND &&
7412 dev->param.markNANDBlockBad &&
7413 dev->param.queryNANDBlock)
7417 /* Can use the "spare" style interface for yaffs1 */
7418 if (!dev->param.isYaffs2 &&
7419 !dev->param.writeChunkWithTagsToNAND &&
7420 !dev->param.readChunkWithTagsFromNAND &&
7421 dev->param.writeChunkToNAND &&
7422 dev->param.readChunkFromNAND &&
7423 !dev->param.markNANDBlockBad &&
7424 !dev->param.queryNANDBlock)
7431 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7433 /* Initialise the unlinked, deleted, root and lost and found directories */
7435 dev->lostNFoundDir = dev->rootDir = NULL;
7436 dev->unlinkedDir = dev->deletedDir = NULL;
7439 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7442 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7445 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7446 YAFFS_ROOT_MODE | S_IFDIR);
7447 dev->lostNFoundDir =
7448 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7449 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7451 if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7452 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7459 int yaffs_GutsInitialise(yaffs_Device *dev)
7461 int init_failed = 0;
7465 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7467 /* Check stuff that must be set */
7470 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7474 dev->internalStartBlock = dev->param.startBlock;
7475 dev->internalEndBlock = dev->param.endBlock;
7476 dev->blockOffset = 0;
7477 dev->chunkOffset = 0;
7478 dev->nFreeChunks = 0;
7482 if (dev->param.startBlock == 0) {
7483 dev->internalStartBlock = dev->param.startBlock + 1;
7484 dev->internalEndBlock = dev->param.endBlock + 1;
7485 dev->blockOffset = 1;
7486 dev->chunkOffset = dev->param.nChunksPerBlock;
7489 /* Check geometry parameters. */
7491 if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
7492 (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
7493 (dev->param.inbandTags && !dev->param.isYaffs2) ||
7494 dev->param.nChunksPerBlock < 2 ||
7495 dev->param.nReservedBlocks < 2 ||
7496 dev->internalStartBlock <= 0 ||
7497 dev->internalEndBlock <= 0 ||
7498 dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) { /* otherwise it is too small */
7499 T(YAFFS_TRACE_ALWAYS,
7501 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7502 TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
7506 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7507 T(YAFFS_TRACE_ALWAYS,
7508 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7512 /* Sort out space for inband tags, if required */
7513 if (dev->param.inbandTags)
7514 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7516 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
7518 /* Got the right mix of functions? */
7519 if (!yaffs_CheckDevFunctions(dev)) {
7520 /* Function missing */
7521 T(YAFFS_TRACE_ALWAYS,
7523 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7528 /* This is really a compilation check. */
7529 if (!yaffs_CheckStructures()) {
7530 T(YAFFS_TRACE_ALWAYS,
7531 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7535 if (dev->isMounted) {
7536 T(YAFFS_TRACE_ALWAYS,
7537 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7541 /* Finished with most checks. One or two more checks happen later on too. */
7545 /* OK now calculate a few things for the device */
7548 * Calculate all the chunk size manipulation numbers:
7550 x = dev->nDataBytesPerChunk;
7551 /* We always use dev->chunkShift and dev->chunkDiv */
7552 dev->chunkShift = Shifts(x);
7553 x >>= dev->chunkShift;
7555 /* We only use chunk mask if chunkDiv is 1 */
7556 dev->chunkMask = (1<<dev->chunkShift) - 1;
7559 * Calculate chunkGroupBits.
7560 * We need to find the next power of 2 > than internalEndBlock
7563 x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
7567 /* Set up tnode width if wide tnodes are enabled. */
7568 if (!dev->param.wideTnodesDisabled) {
7569 /* bits must be even so that we end up with 32-bit words */
7573 dev->tnodeWidth = 16;
7575 dev->tnodeWidth = bits;
7577 dev->tnodeWidth = 16;
7579 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7581 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7582 * so if the bitwidth of the
7583 * chunk range we're using is greater than 16 we need
7584 * to figure out chunk shift and chunkGroupSize
7587 if (bits <= dev->tnodeWidth)
7588 dev->chunkGroupBits = 0;
7590 dev->chunkGroupBits = bits - dev->tnodeWidth;
7593 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7595 if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
7596 /* We have a problem because the soft delete won't work if
7597 * the chunk group size > chunks per block.
7598 * This can be remedied by using larger "virtual blocks".
7600 T(YAFFS_TRACE_ALWAYS,
7601 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7606 /* OK, we've finished verifying the device, lets continue with initialisation */
7608 /* More device initialisation */
7609 dev->garbageCollections = 0;
7610 dev->passiveGarbageCollections = 0;
7611 dev->currentDirtyChecker = 0;
7612 dev->bufferedBlock = -1;
7613 dev->doingBufferedBlockRewrite = 0;
7614 dev->nDeletedFiles = 0;
7615 dev->nBackgroundDeletions = 0;
7616 dev->nUnlinkedFiles = 0;
7618 dev->eccUnfixed = 0;
7619 dev->tagsEccFixed = 0;
7620 dev->tagsEccUnfixed = 0;
7621 dev->nErasureFailures = 0;
7622 dev->nErasedBlocks = 0;
7624 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7626 /* Initialise temporary buffers and caches. */
7627 if (!yaffs_InitialiseTempBuffers(dev))
7630 dev->srCache = NULL;
7631 dev->gcCleanupList = NULL;
7635 dev->param.nShortOpCaches > 0) {
7638 int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
7640 if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7641 dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7643 dev->srCache = YMALLOC(srCacheBytes);
7645 buf = (__u8 *) dev->srCache;
7648 memset(dev->srCache, 0, srCacheBytes);
7650 for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
7651 dev->srCache[i].object = NULL;
7652 dev->srCache[i].lastUse = 0;
7653 dev->srCache[i].dirty = 0;
7654 dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
7665 dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
7666 if (!dev->gcCleanupList)
7670 if (dev->param.isYaffs2)
7671 dev->param.useHeaderFileSize = 1;
7673 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7676 yaffs_InitialiseTnodes(dev);
7677 yaffs_InitialiseObjects(dev);
7679 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7684 /* Now scan the flash. */
7685 if (dev->param.isYaffs2) {
7686 if (yaffs_CheckpointRestore(dev)) {
7687 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7688 T(YAFFS_TRACE_ALWAYS,
7689 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7692 /* Clean up the mess caused by an aborted checkpoint load
7693 * and scan backwards.
7695 yaffs_DeinitialiseBlocks(dev);
7696 yaffs_DeinitialiseTnodes(dev);
7697 yaffs_DeinitialiseObjects(dev);
7700 dev->nErasedBlocks = 0;
7701 dev->nFreeChunks = 0;
7702 dev->allocationBlock = -1;
7703 dev->allocationPage = -1;
7704 dev->nDeletedFiles = 0;
7705 dev->nUnlinkedFiles = 0;
7706 dev->nBackgroundDeletions = 0;
7707 dev->oldestDirtySequence = 0;
7709 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7712 yaffs_InitialiseTnodes(dev);
7713 yaffs_InitialiseObjects(dev);
7715 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7718 if (!init_failed && !yaffs_ScanBackwards(dev))
7721 } else if (!yaffs_Scan(dev))
7724 yaffs_StripDeletedObjects(dev);
7725 yaffs_FixHangingObjects(dev);
7726 if(dev->param.emptyLostAndFound)
7727 yaffs_EmptyLostAndFound(dev);
7731 /* Clean up the mess */
7732 T(YAFFS_TRACE_TRACING,
7733 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7735 yaffs_Deinitialise(dev);
7739 /* Zero out stats */
7740 dev->nPageReads = 0;
7741 dev->nPageWrites = 0;
7742 dev->nBlockErasures = 0;
7744 dev->nRetriedWrites = 0;
7746 dev->nRetiredBlocks = 0;
7748 yaffs_VerifyFreeChunks(dev);
7749 yaffs_VerifyBlocks(dev);
7751 /* Clean up any aborted checkpoint data */
7752 if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
7753 yaffs_InvalidateCheckpoint(dev);
7755 T(YAFFS_TRACE_TRACING,
7756 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7761 void yaffs_Deinitialise(yaffs_Device *dev)
7763 if (dev->isMounted) {
7766 yaffs_DeinitialiseBlocks(dev);
7767 yaffs_DeinitialiseTnodes(dev);
7768 yaffs_DeinitialiseObjects(dev);
7769 if (dev->param.nShortOpCaches > 0 &&
7772 for (i = 0; i < dev->param.nShortOpCaches; i++) {
7773 if (dev->srCache[i].data)
7774 YFREE(dev->srCache[i].data);
7775 dev->srCache[i].data = NULL;
7778 YFREE(dev->srCache);
7779 dev->srCache = NULL;
7782 YFREE(dev->gcCleanupList);
7784 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7785 YFREE(dev->tempBuffer[i].buffer);
7789 if (dev->param.deinitialiseNAND)
7790 dev->param.deinitialiseNAND(dev);
7794 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7799 yaffs_BlockInfo *blk;
7801 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7803 blk = yaffs_GetBlockInfo(dev, b);
7805 switch (blk->blockState) {
7806 case YAFFS_BLOCK_STATE_EMPTY:
7807 case YAFFS_BLOCK_STATE_ALLOCATING:
7808 case YAFFS_BLOCK_STATE_COLLECTING:
7809 case YAFFS_BLOCK_STATE_FULL:
7811 (dev->param.nChunksPerBlock - blk->pagesInUse +
7812 blk->softDeletions);
7822 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7824 /* This is what we report to the outside world */
7827 int nDirtyCacheChunks;
7828 int blocksForCheckpoint;
7832 nFree = dev->nFreeChunks;
7834 nFree = yaffs_CountFreeChunks(dev);
7837 nFree += dev->nDeletedFiles;
7839 /* Now count the number of dirty chunks in the cache and subtract those */
7841 for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
7842 if (dev->srCache[i].dirty)
7843 nDirtyCacheChunks++;
7846 nFree -= nDirtyCacheChunks;
7848 nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
7850 /* Now we figure out how much to reserve for the checkpoint and report that... */
7851 blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7852 if (blocksForCheckpoint < 0)
7853 blocksForCheckpoint = 0;
7855 nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
7864 static int yaffs_freeVerificationFailures;
7866 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7871 if (yaffs_SkipVerification(dev))
7874 counted = yaffs_CountFreeChunks(dev);
7876 difference = dev->nFreeChunks - counted;
7879 T(YAFFS_TRACE_ALWAYS,
7880 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7881 dev->nFreeChunks, counted, difference));
7882 yaffs_freeVerificationFailures++;
7886 /*---------------------------------------- YAFFS test code ----------------------*/
7888 #define yaffs_CheckStruct(structure, syze, name) \
7890 if (sizeof(structure) != syze) { \
7891 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7892 name, syze, (int) sizeof(structure))); \
7893 return YAFFS_FAIL; \
7897 static int yaffs_CheckStructures(void)
7899 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7900 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7901 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7902 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7903 /* yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
7905 #ifndef CONFIG_YAFFS_WINCE
7906 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");