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 1.118 2010-03-12 01:22:48 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
38 #define YAFFS_SMALL_HOLE_THRESHOLD 3
40 #include "yaffs_ecc.h"
43 /* Robustification (if it ever comes about...) */
44 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
45 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
47 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
49 const yaffs_ExtendedTags *tags);
50 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
51 const yaffs_ExtendedTags *tags);
53 /* Other local prototypes */
54 static void yaffs_UpdateParent(yaffs_Object *obj);
55 static int yaffs_UnlinkObject(yaffs_Object *obj);
56 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
58 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
60 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
62 yaffs_ExtendedTags *tags,
64 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
65 int chunkInNAND, int inScan);
67 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
68 yaffs_ObjectType type);
69 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
71 static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
72 int force, int isShrink, int shadows);
73 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
74 static int yaffs_CheckStructures(void);
75 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
76 int chunkOffset, int *limit);
77 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
79 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
82 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
85 static int yaffs_UnlinkWorker(yaffs_Object *obj);
87 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
90 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
91 yaffs_BlockInfo **blockUsedPtr);
93 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
95 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
97 static void yaffs_VerifyDirectory(yaffs_Object *directory);
99 static int yaffs_CheckFileSanity(yaffs_Object *in);
101 #define yaffs_CheckFileSanity(in)
104 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
105 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
107 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
109 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
110 yaffs_ExtendedTags *tags);
112 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
114 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
115 yaffs_FileStructure *fStruct,
118 static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize);
119 static void yaffs_SkipRestOfBlock(yaffs_Device *dev);
120 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
123 yaffs_ExtendedTags *tags);
125 /* Function to calculate chunk and offset */
127 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
133 chunk = (__u32)(addr >> dev->chunkShift);
135 if (dev->chunkDiv == 1) {
136 /* easy power of 2 case */
137 offset = (__u32)(addr & dev->chunkMask);
139 /* Non power-of-2 case */
143 chunk /= dev->chunkDiv;
145 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
146 offset = (__u32)(addr - chunkBase);
153 /* Function to return the number of shifts for a power of 2 greater than or
154 * equal to the given number
155 * Note we don't try to cater for all possible numbers and this does not have to
156 * be hellishly efficient.
159 static __u32 ShiftsGE(__u32 x)
164 nShifts = extraBits = 0;
179 /* Function to return the number of shifts to get a 1 in bit 0
182 static __u32 Shifts(__u32 x)
202 * Temporary buffer manipulations.
205 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
208 __u8 *buf = (__u8 *)1;
210 memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
212 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
213 dev->tempBuffer[i].line = 0; /* not in use */
214 dev->tempBuffer[i].buffer = buf =
215 YMALLOC_DMA(dev->param.totalBytesPerChunk);
218 return buf ? YAFFS_OK : YAFFS_FAIL;
221 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
226 if (dev->tempInUse > dev->maxTemp)
227 dev->maxTemp = dev->tempInUse;
229 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
230 if (dev->tempBuffer[i].line == 0) {
231 dev->tempBuffer[i].line = lineNo;
232 if ((i + 1) > dev->maxTemp) {
233 dev->maxTemp = i + 1;
234 for (j = 0; j <= i; j++)
235 dev->tempBuffer[j].maxLine =
236 dev->tempBuffer[j].line;
239 return dev->tempBuffer[i].buffer;
243 T(YAFFS_TRACE_BUFFERS,
244 (TSTR("Out of temp buffers at line %d, other held by lines:"),
246 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
247 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
249 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
252 * If we got here then we have to allocate an unmanaged one
256 dev->unmanagedTempAllocations++;
257 return YMALLOC(dev->nDataBytesPerChunk);
261 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
268 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
269 if (dev->tempBuffer[i].buffer == buffer) {
270 dev->tempBuffer[i].line = 0;
276 /* assume it is an unmanaged one. */
277 T(YAFFS_TRACE_BUFFERS,
278 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
281 dev->unmanagedTempDeallocations++;
287 * Determine if we have a managed buffer.
289 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
293 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
294 if (dev->tempBuffer[i].buffer == buffer)
298 for (i = 0; i < dev->param.nShortOpCaches; i++) {
299 if (dev->srCache[i].data == buffer)
303 if (buffer == dev->checkpointBuffer)
306 T(YAFFS_TRACE_ALWAYS,
307 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
314 * Chunk bitmap manipulations
317 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
319 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
321 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
325 return dev->chunkBits +
326 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
329 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
331 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
332 chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
334 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
340 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
342 __u8 *blkBits = yaffs_BlockBits(dev, blk);
344 memset(blkBits, 0, dev->chunkBitmapStride);
347 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
349 __u8 *blkBits = yaffs_BlockBits(dev, blk);
351 yaffs_VerifyChunkBitId(dev, blk, chunk);
353 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
356 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
358 __u8 *blkBits = yaffs_BlockBits(dev, blk);
360 yaffs_VerifyChunkBitId(dev, blk, chunk);
362 blkBits[chunk / 8] |= (1 << (chunk & 7));
365 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
367 __u8 *blkBits = yaffs_BlockBits(dev, blk);
368 yaffs_VerifyChunkBitId(dev, blk, chunk);
370 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
373 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
375 __u8 *blkBits = yaffs_BlockBits(dev, blk);
377 for (i = 0; i < dev->chunkBitmapStride; i++) {
385 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
387 __u8 *blkBits = yaffs_BlockBits(dev, blk);
390 for (i = 0; i < dev->chunkBitmapStride; i++) {
407 static int yaffs_SkipVerification(yaffs_Device *dev)
410 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
413 static int yaffs_SkipFullVerification(yaffs_Device *dev)
416 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
419 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
422 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
425 static const char *blockStateName[] = {
438 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
443 if (yaffs_SkipVerification(dev))
446 /* Report illegal runtime states */
447 if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
448 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
450 switch (bi->blockState) {
451 case YAFFS_BLOCK_STATE_UNKNOWN:
452 case YAFFS_BLOCK_STATE_SCANNING:
453 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
454 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
455 n, blockStateName[bi->blockState]));
458 /* Check pages in use and soft deletions are legal */
460 actuallyUsed = bi->pagesInUse - bi->softDeletions;
462 if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock ||
463 bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
464 actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock)
465 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
466 n, bi->pagesInUse, bi->softDeletions));
469 /* Check chunk bitmap legal */
470 inUse = yaffs_CountChunkBits(dev, n);
471 if (inUse != bi->pagesInUse)
472 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
473 n, bi->pagesInUse, inUse));
475 /* Check that the sequence number is valid.
476 * Ten million is legal, but is very unlikely
478 if (dev->param.isYaffs2 &&
479 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
480 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
481 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
482 n, bi->sequenceNumber));
485 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
488 yaffs_VerifyBlock(dev, bi, n);
490 /* After collection the block should be in the erased state */
491 /* This will need to change if we do partial gc */
493 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
494 bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
495 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
500 static void yaffs_VerifyBlocks(yaffs_Device *dev)
503 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
504 int nIllegalBlockStates = 0;
506 if (yaffs_SkipVerification(dev))
509 memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
511 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
512 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
513 yaffs_VerifyBlock(dev, bi, i);
515 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
516 nBlocksPerState[bi->blockState]++;
518 nIllegalBlockStates++;
521 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
522 T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
524 T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
525 if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
526 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
528 for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
529 T(YAFFS_TRACE_VERIFY,
530 (TSTR("%s %d blocks"TENDSTR),
531 blockStateName[i], nBlocksPerState[i]));
533 if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
534 T(YAFFS_TRACE_VERIFY,
535 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
536 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
538 if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
539 T(YAFFS_TRACE_VERIFY,
540 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
541 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
543 if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
544 T(YAFFS_TRACE_VERIFY,
545 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
546 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
548 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
553 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
554 * case those tests will not be performed.
556 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
558 if (obj && yaffs_SkipVerification(obj->myDev))
561 if (!(tags && obj && oh)) {
562 T(YAFFS_TRACE_VERIFY,
563 (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
568 if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
569 oh->type > YAFFS_OBJECT_TYPE_MAX)
570 T(YAFFS_TRACE_VERIFY,
571 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
572 tags->objectId, oh->type));
574 if (tags->objectId != obj->objectId)
575 T(YAFFS_TRACE_VERIFY,
576 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
577 tags->objectId, obj->objectId));
581 * Check that the object's parent ids match if parentCheck requested.
583 * Tests do not apply to the root object.
586 if (parentCheck && tags->objectId > 1 && !obj->parent)
587 T(YAFFS_TRACE_VERIFY,
588 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
589 tags->objectId, oh->parentObjectId));
591 if (parentCheck && obj->parent &&
592 oh->parentObjectId != obj->parent->objectId &&
593 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
594 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
595 T(YAFFS_TRACE_VERIFY,
596 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
597 tags->objectId, oh->parentObjectId, obj->parent->objectId));
599 if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
600 T(YAFFS_TRACE_VERIFY,
601 (TSTR("Obj %d header name is NULL"TENDSTR),
604 if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
605 T(YAFFS_TRACE_VERIFY,
606 (TSTR("Obj %d header name is 0xFF"TENDSTR),
612 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
613 __u32 level, int chunkOffset)
616 yaffs_Device *dev = obj->myDev;
622 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
623 if (tn->internal[i]) {
624 ok = yaffs_VerifyTnodeWorker(obj,
627 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
630 } else if (level == 0) {
631 yaffs_ExtendedTags tags;
632 __u32 objectId = obj->objectId;
634 chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
636 for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
637 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
640 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
641 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
642 if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
643 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
644 objectId, chunkOffset, theChunk,
645 tags.objectId, tags.chunkId));
658 static void yaffs_VerifyFile(yaffs_Object *obj)
660 int requiredTallness;
666 yaffs_ExtendedTags tags;
673 if (yaffs_SkipVerification(obj->myDev))
677 objectId = obj->objectId;
679 /* Check file size is consistent with tnode depth */
680 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
681 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
682 requiredTallness = 0;
684 x >>= YAFFS_TNODES_INTERNAL_BITS;
688 actualTallness = obj->variant.fileVariant.topLevel;
690 /* Check that the chunks in the tnode tree are all correct.
691 * We do this by scanning through the tnode tree and
692 * checking the tags for every chunk match.
695 if (yaffs_SkipNANDVerification(dev))
698 for (i = 1; i <= lastChunk; i++) {
699 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
702 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
704 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
705 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
706 if (tags.objectId != objectId || tags.chunkId != i) {
707 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
708 objectId, i, theChunk,
709 tags.objectId, tags.chunkId));
717 static void yaffs_VerifyHardLink(yaffs_Object *obj)
719 if (obj && yaffs_SkipVerification(obj->myDev))
722 /* Verify sane equivalent object */
725 static void yaffs_VerifySymlink(yaffs_Object *obj)
727 if (obj && yaffs_SkipVerification(obj->myDev))
730 /* Verify symlink string */
733 static void yaffs_VerifySpecial(yaffs_Object *obj)
735 if (obj && yaffs_SkipVerification(obj->myDev))
739 static void yaffs_VerifyObject(yaffs_Object *obj)
748 __u32 chunkShouldNotBeDeleted;
754 if (obj->beingCreated)
759 if (yaffs_SkipVerification(dev))
762 /* Check sane object header chunk */
764 chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
765 chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
767 chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
768 chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
769 chunkValid = chunkInRange &&
770 yaffs_CheckChunkBit(dev,
771 obj->hdrChunk / dev->param.nChunksPerBlock,
772 obj->hdrChunk % dev->param.nChunksPerBlock);
773 chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
776 (!chunkIdOk || chunkShouldNotBeDeleted)) {
777 T(YAFFS_TRACE_VERIFY,
778 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
779 obj->objectId, obj->hdrChunk,
780 chunkIdOk ? "" : ",out of range",
781 chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
784 if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
785 yaffs_ExtendedTags tags;
786 yaffs_ObjectHeader *oh;
787 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
789 oh = (yaffs_ObjectHeader *)buffer;
791 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
794 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
796 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
799 /* Verify it has a parent */
800 if (obj && !obj->fake &&
801 (!obj->parent || obj->parent->myDev != dev)) {
802 T(YAFFS_TRACE_VERIFY,
803 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
804 obj->objectId, obj->parent));
807 /* Verify parent is a directory */
808 if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
809 T(YAFFS_TRACE_VERIFY,
810 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
811 obj->objectId, obj->parent->variantType));
814 switch (obj->variantType) {
815 case YAFFS_OBJECT_TYPE_FILE:
816 yaffs_VerifyFile(obj);
818 case YAFFS_OBJECT_TYPE_SYMLINK:
819 yaffs_VerifySymlink(obj);
821 case YAFFS_OBJECT_TYPE_DIRECTORY:
822 yaffs_VerifyDirectory(obj);
824 case YAFFS_OBJECT_TYPE_HARDLINK:
825 yaffs_VerifyHardLink(obj);
827 case YAFFS_OBJECT_TYPE_SPECIAL:
828 yaffs_VerifySpecial(obj);
830 case YAFFS_OBJECT_TYPE_UNKNOWN:
832 T(YAFFS_TRACE_VERIFY,
833 (TSTR("Obj %d has illegaltype %d"TENDSTR),
834 obj->objectId, obj->variantType));
839 static void yaffs_VerifyObjects(yaffs_Device *dev)
843 struct ylist_head *lh;
845 if (yaffs_SkipVerification(dev))
848 /* Iterate through the objects in each hash entry */
850 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
851 ylist_for_each(lh, &dev->objectBucket[i].list) {
853 obj = ylist_entry(lh, yaffs_Object, hashLink);
854 yaffs_VerifyObject(obj);
862 * Simple hash function. Needs to have a reasonable spread
865 static Y_INLINE int yaffs_HashFunction(int n)
868 return n % YAFFS_NOBJECT_BUCKETS;
872 * Access functions to useful fake objects.
873 * Note that root might have a presence in NAND if permissions are set.
876 yaffs_Object *yaffs_Root(yaffs_Device *dev)
881 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
883 return dev->lostNFoundDir;
888 * Erased NAND checking functions
891 int yaffs_CheckFF(__u8 *buffer, int nBytes)
893 /* Horrible, slow implementation */
902 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
905 int retval = YAFFS_OK;
906 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
907 yaffs_ExtendedTags tags;
910 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
912 if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
915 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
916 T(YAFFS_TRACE_NANDACCESS,
917 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
921 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
928 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
931 yaffs_ExtendedTags *tags)
933 int retval = YAFFS_OK;
934 yaffs_ExtendedTags tempTags;
935 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
938 result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
939 if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
940 tempTags.objectId != tags->objectId ||
941 tempTags.chunkId != tags->chunkId ||
942 tempTags.byteCount != tags->byteCount)
945 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
950 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
952 yaffs_ExtendedTags *tags,
959 yaffs_InvalidateCheckpoint(dev);
962 yaffs_BlockInfo *bi = 0;
965 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
971 /* First check this chunk is erased, if it needs
972 * checking. The checking policy (unless forced
973 * always on) is as follows:
975 * Check the first page we try to write in a block.
976 * If the check passes then we don't need to check any
977 * more. If the check fails, we check again...
978 * If the block has been erased, we don't need to check.
980 * However, if the block has been prioritised for gc,
981 * then we think there might be something odd about
982 * this block and stop using it.
984 * Rationale: We should only ever see chunks that have
985 * not been erased if there was a partially written
986 * chunk due to power loss. This checking policy should
987 * catch that case with very few checks and thus save a
988 * lot of checks that are most likely not needed.
991 * If an erase check fails or the write fails we skip the
995 /* let's give it a try */
998 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
999 bi->skipErasedCheck = 0;
1001 if (!bi->skipErasedCheck) {
1002 erasedOk = yaffs_CheckChunkErased(dev, chunk);
1003 if (erasedOk != YAFFS_OK) {
1004 T(YAFFS_TRACE_ERROR,
1005 (TSTR("**>> yaffs chunk %d was not erased"
1008 /* If not erased, delete this one,
1009 * skip rest of block and
1010 * try another chunk */
1011 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
1012 yaffs_SkipRestOfBlock(dev);
1017 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
1020 if(!bi->skipErasedCheck)
1021 writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
1023 if (writeOk != YAFFS_OK) {
1024 /* Clean up aborted write, skip to next block and
1025 * try another chunk */
1026 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
1030 bi->skipErasedCheck = 1;
1032 /* Copy the data into the robustification buffer */
1033 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
1035 } while (writeOk != YAFFS_OK &&
1036 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1042 T(YAFFS_TRACE_ERROR,
1043 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1046 dev->nRetriedWrites += (attempts - 1);
1054 * Oldest Dirty Sequence Number handling.
1057 /* yaffs_CalcOldestDirtySequence()
1058 * yaffs_FindOldestDirtySequence()
1059 * Calculate the oldest dirty sequence number if we don't know it.
1061 static int yaffs_CalcOldestDirtySequence(yaffs_Device *dev)
1065 yaffs_BlockInfo *b = 0;
1067 if(!dev->param.isYaffs2)
1070 /* Find the oldest dirty sequence number. */
1071 seq = dev->sequenceNumber;
1072 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
1073 b = yaffs_GetBlockInfo(dev, i);
1074 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1075 (b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
1076 b->sequenceNumber < seq)
1077 seq = b->sequenceNumber;
1083 static void yaffs_FindOldestDirtySequence(yaffs_Device *dev)
1085 if(dev->param.isYaffs2 && !dev->oldestDirtySequence)
1086 dev->oldestDirtySequence =
1087 yaffs_CalcOldestDirtySequence(dev);
1090 if(!yaffs_SkipVerification(dev) &&
1091 dev->oldestDirtySequence != yaffs_CalcOldestDirtySequence(dev))
1098 * yaffs_ClearOldestDirtySequence()
1099 * Called when a block is erased or marked bad. (ie. when its sequenceNumber
1100 * becomes invalid). If the value matches the oldest then we clear
1101 * dev->oldestDirtySequence to force its recomputation.
1103 static void yaffs_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
1106 if(!dev->param.isYaffs2)
1109 if(!bi || bi->sequenceNumber == dev->oldestDirtySequence)
1110 dev->oldestDirtySequence = 0;
1114 * yaffs_UpdateOldestDirtySequence()
1115 * Update the oldest dirty sequence number whenever we dirty a block.
1116 * Only do this if the oldestDirtySequence is actually being tracked.
1118 static void yaffs_UpdateOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
1120 if(dev->param.isYaffs2 && dev->oldestDirtySequence){
1121 if(dev->oldestDirtySequence > bi->sequenceNumber)
1122 dev->oldestDirtySequence = bi->sequenceNumber;
1127 * Block retiring for handling a broken block.
1130 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1132 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1134 yaffs_InvalidateCheckpoint(dev);
1136 yaffs_ClearOldestDirtySequence(dev,bi);
1138 if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1139 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1140 T(YAFFS_TRACE_ALWAYS, (TSTR(
1141 "yaffs: Failed to mark bad and erase block %d"
1142 TENDSTR), blockInNAND));
1144 yaffs_ExtendedTags tags;
1145 int chunkId = blockInNAND * dev->param.nChunksPerBlock;
1147 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1149 memset(buffer, 0xff, dev->nDataBytesPerChunk);
1150 yaffs_InitialiseTags(&tags);
1151 tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1152 if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
1153 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1154 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1155 TCONT("write bad block marker to block %d")
1156 TENDSTR), blockInNAND));
1158 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1162 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1163 bi->gcPrioritise = 0;
1164 bi->needsRetiring = 0;
1166 dev->nRetiredBlocks++;
1170 * Functions for robustisizing TODO
1174 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1176 const yaffs_ExtendedTags *tags)
1179 chunkInNAND=chunkInNAND;
1184 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1185 const yaffs_ExtendedTags *tags)
1188 chunkInNAND=chunkInNAND;
1192 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1194 if (!bi->gcPrioritise) {
1195 bi->gcPrioritise = 1;
1196 dev->hasPendingPrioritisedGCs = 1;
1197 bi->chunkErrorStrikes++;
1199 if (bi->chunkErrorStrikes > 3) {
1200 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1201 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1207 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1210 int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
1211 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1213 yaffs_HandleChunkError(dev, bi);
1216 /* Was an actual write failure, so mark the block for retirement */
1217 bi->needsRetiring = 1;
1218 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1219 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1222 /* Delete the chunk */
1223 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1224 yaffs_SkipRestOfBlock(dev);
1228 /*---------------- Name handling functions ------------*/
1230 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1235 const YUCHAR *bname = (const YUCHAR *) name;
1237 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1239 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1240 sum += yaffs_toupper(*bname) * i;
1242 sum += (*bname) * i;
1251 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1253 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1254 memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1255 if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
1256 yaffs_strcpy(obj->shortName, name);
1258 obj->shortName[0] = _Y('\0');
1260 obj->sum = yaffs_CalcNameSum(name);
1263 /*-------------------- TNODES -------------------
1265 * List of spare tnodes
1266 * The list is hooked together using the first pointer
1270 /* yaffs_CreateTnodes creates a bunch more tnodes and
1271 * adds them to the tnode free list.
1272 * Don't use this function directly
1274 static Y_INLINE int yaffs_CalcTnodeSize(yaffs_Device *dev)
1277 /* Calculate the tnode size in bytes for variable width tnode support.
1278 * Must be a multiple of 32-bits */
1279 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1281 if (tnodeSize < sizeof(yaffs_Tnode))
1282 tnodeSize = sizeof(yaffs_Tnode);
1286 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1289 int tnodeSize = yaffs_CalcTnodeSize(dev);
1290 yaffs_Tnode *newTnodes;
1294 yaffs_TnodeList *tnl;
1300 /* make these things */
1302 newTnodes = YMALLOC(nTnodes * tnodeSize);
1303 mem = (__u8 *)newTnodes;
1306 T(YAFFS_TRACE_ERROR,
1307 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1311 /* Hook them into the free list */
1313 for (i = 0; i < nTnodes - 1; i++) {
1314 newTnodes[i].internal[0] = &newTnodes[i + 1];
1315 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1316 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1320 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1321 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1322 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1324 dev->freeTnodes = newTnodes;
1326 /* New hookup for wide tnodes */
1327 for (i = 0; i < nTnodes - 1; i++) {
1328 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1329 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1330 curr->internal[0] = next;
1333 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1334 curr->internal[0] = dev->freeTnodes;
1335 dev->freeTnodes = (yaffs_Tnode *)mem;
1340 dev->nFreeTnodes += nTnodes;
1341 dev->nTnodesCreated += nTnodes;
1343 /* Now add this bunch of tnodes to a list for freeing up.
1344 * NB If we can't add this to the management list it isn't fatal
1345 * but it just means we can't free this bunch of tnodes later.
1348 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1350 T(YAFFS_TRACE_ERROR,
1352 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1355 tnl->tnodes = newTnodes;
1356 tnl->next = dev->allocatedTnodeList;
1357 dev->allocatedTnodeList = tnl;
1360 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1365 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1367 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1369 yaffs_Tnode *tn = NULL;
1371 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1372 tn = YMALLOC(yaffs_CalcTnodeSize(dev));
1374 dev->nTnodesCreated++;
1376 /* If there are none left make more */
1377 if (!dev->freeTnodes)
1378 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1380 if (dev->freeTnodes) {
1381 tn = dev->freeTnodes;
1382 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1383 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1384 /* Hoosterman, this thing looks like it isn't in the list */
1385 T(YAFFS_TRACE_ALWAYS,
1386 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1389 dev->freeTnodes = dev->freeTnodes->internal[0];
1393 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1398 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1400 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1401 int tnodeSize = yaffs_CalcTnodeSize(dev);
1404 memset(tn, 0, tnodeSize);
1409 /* FreeTnode frees up a tnode and puts it back on the free list */
1410 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1413 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1415 dev->nTnodesCreated--;
1417 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1418 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1419 /* Hoosterman, this thing looks like it is already in the list */
1420 T(YAFFS_TRACE_ALWAYS,
1421 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1423 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1425 tn->internal[0] = dev->freeTnodes;
1426 dev->freeTnodes = tn;
1430 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1433 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1435 /* Free the list of allocated tnodes */
1436 yaffs_TnodeList *tmp;
1438 while (dev->allocatedTnodeList) {
1439 tmp = dev->allocatedTnodeList->next;
1441 YFREE(dev->allocatedTnodeList->tnodes);
1442 YFREE(dev->allocatedTnodeList);
1443 dev->allocatedTnodeList = tmp;
1447 dev->freeTnodes = NULL;
1448 dev->nFreeTnodes = 0;
1449 dev->nTnodesCreated = 0;
1452 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1454 dev->allocatedTnodeList = NULL;
1455 dev->freeTnodes = NULL;
1456 dev->nFreeTnodes = 0;
1457 dev->nTnodesCreated = 0;
1461 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1464 __u32 *map = (__u32 *)tn;
1470 pos &= YAFFS_TNODES_LEVEL0_MASK;
1471 val >>= dev->chunkGroupBits;
1473 bitInMap = pos * dev->tnodeWidth;
1474 wordInMap = bitInMap / 32;
1475 bitInWord = bitInMap & (32 - 1);
1477 mask = dev->tnodeMask << bitInWord;
1479 map[wordInMap] &= ~mask;
1480 map[wordInMap] |= (mask & (val << bitInWord));
1482 if (dev->tnodeWidth > (32 - bitInWord)) {
1483 bitInWord = (32 - bitInWord);
1485 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1486 map[wordInMap] &= ~mask;
1487 map[wordInMap] |= (mask & (val >> bitInWord));
1491 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1494 __u32 *map = (__u32 *)tn;
1500 pos &= YAFFS_TNODES_LEVEL0_MASK;
1502 bitInMap = pos * dev->tnodeWidth;
1503 wordInMap = bitInMap / 32;
1504 bitInWord = bitInMap & (32 - 1);
1506 val = map[wordInMap] >> bitInWord;
1508 if (dev->tnodeWidth > (32 - bitInWord)) {
1509 bitInWord = (32 - bitInWord);
1511 val |= (map[wordInMap] << bitInWord);
1514 val &= dev->tnodeMask;
1515 val <<= dev->chunkGroupBits;
1520 /* ------------------- End of individual tnode manipulation -----------------*/
1522 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1523 * The look up tree is represented by the top tnode and the number of topLevel
1524 * in the tree. 0 means only the level 0 tnode is in the tree.
1527 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1528 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1529 yaffs_FileStructure *fStruct,
1532 yaffs_Tnode *tn = fStruct->top;
1534 int requiredTallness;
1535 int level = fStruct->topLevel;
1539 /* Check sane level and chunk Id */
1540 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1543 if (chunkId > YAFFS_MAX_CHUNK_ID)
1546 /* First check we're tall enough (ie enough topLevel) */
1548 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1549 requiredTallness = 0;
1551 i >>= YAFFS_TNODES_INTERNAL_BITS;
1555 if (requiredTallness > fStruct->topLevel)
1556 return NULL; /* Not tall enough, so we can't find it */
1558 /* Traverse down to level 0 */
1559 while (level > 0 && tn) {
1560 tn = tn->internal[(chunkId >>
1561 (YAFFS_TNODES_LEVEL0_BITS +
1563 YAFFS_TNODES_INTERNAL_BITS)) &
1564 YAFFS_TNODES_INTERNAL_MASK];
1571 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1572 * This happens in two steps:
1573 * 1. If the tree isn't tall enough, then make it taller.
1574 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1576 * Used when modifying the tree.
1578 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1579 * be plugged into the ttree.
1582 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1583 yaffs_FileStructure *fStruct,
1585 yaffs_Tnode *passedTn)
1587 int requiredTallness;
1595 /* Check sane level and page Id */
1596 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1599 if (chunkId > YAFFS_MAX_CHUNK_ID)
1602 /* First check we're tall enough (ie enough topLevel) */
1604 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1605 requiredTallness = 0;
1607 x >>= YAFFS_TNODES_INTERNAL_BITS;
1612 if (requiredTallness > fStruct->topLevel) {
1613 /* Not tall enough, gotta make the tree taller */
1614 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1616 tn = yaffs_GetTnode(dev);
1619 tn->internal[0] = fStruct->top;
1621 fStruct->topLevel++;
1623 T(YAFFS_TRACE_ERROR,
1624 (TSTR("yaffs: no more tnodes" TENDSTR)));
1630 /* Traverse down to level 0, adding anything we need */
1632 l = fStruct->topLevel;
1636 while (l > 0 && tn) {
1638 (YAFFS_TNODES_LEVEL0_BITS +
1639 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1640 YAFFS_TNODES_INTERNAL_MASK;
1643 if ((l > 1) && !tn->internal[x]) {
1644 /* Add missing non-level-zero tnode */
1645 tn->internal[x] = yaffs_GetTnode(dev);
1646 if(!tn->internal[x])
1648 } else if (l == 1) {
1649 /* Looking from level 1 at level 0 */
1651 /* If we already have one, then release it.*/
1652 if (tn->internal[x])
1653 yaffs_FreeTnode(dev, tn->internal[x]);
1654 tn->internal[x] = passedTn;
1656 } else if (!tn->internal[x]) {
1657 /* Don't have one, none passed in */
1658 tn->internal[x] = yaffs_GetTnode(dev);
1659 if(!tn->internal[x])
1664 tn = tn->internal[x];
1668 /* top is level 0 */
1670 memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1671 yaffs_FreeTnode(dev, passedTn);
1678 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1679 yaffs_ExtendedTags *tags, int objectId,
1684 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1685 if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
1686 theChunk % dev->param.nChunksPerBlock)) {
1688 if(dev->chunkGroupSize == 1)
1691 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1693 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1705 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1706 * chunks and tnodes in the file
1707 * Returns 1 if the tree was deleted.
1708 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1711 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1712 int chunkOffset, int *limit)
1717 yaffs_ExtendedTags tags;
1719 yaffs_Device *dev = in->myDev;
1725 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1727 if (tn->internal[i]) {
1728 if (limit && (*limit) < 0) {
1732 yaffs_DeleteWorker(in,
1740 YAFFS_TNODES_INTERNAL_BITS)
1745 yaffs_FreeTnode(dev,
1748 tn->internal[i] = NULL;
1752 return (allDone) ? 1 : 0;
1753 } else if (level == 0) {
1756 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1758 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1761 chunkInInode = (chunkOffset <<
1762 YAFFS_TNODES_LEVEL0_BITS) + i;
1765 yaffs_FindChunkInGroup(dev,
1771 if (foundChunk > 0) {
1772 yaffs_DeleteChunk(dev,
1777 *limit = *limit - 1;
1784 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1788 return (i < 0) ? 1 : 0;
1798 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1800 yaffs_BlockInfo *theBlock;
1802 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1804 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->param.nChunksPerBlock);
1806 theBlock->softDeletions++;
1808 yaffs_UpdateOldestDirtySequence(dev,theBlock);
1812 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1813 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1815 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1818 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1819 __u32 level, int chunkOffset)
1824 yaffs_Device *dev = in->myDev;
1829 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1831 if (tn->internal[i]) {
1833 yaffs_SoftDeleteWorker(in,
1839 YAFFS_TNODES_INTERNAL_BITS)
1842 yaffs_FreeTnode(dev,
1845 tn->internal[i] = NULL;
1847 /* Hoosterman... how could this happen? */
1851 return (allDone) ? 1 : 0;
1852 } else if (level == 0) {
1854 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1855 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1857 /* Note this does not find the real chunk, only the chunk group.
1858 * We make an assumption that a chunk group is not larger than
1861 yaffs_SoftDeleteChunk(dev, theChunk);
1862 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1876 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1879 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1880 if (obj->nDataChunks <= 0) {
1881 /* Empty file with no duplicate object headers, just delete it immediately */
1882 yaffs_FreeTnode(obj->myDev,
1883 obj->variant.fileVariant.top);
1884 obj->variant.fileVariant.top = NULL;
1885 T(YAFFS_TRACE_TRACING,
1886 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1888 yaffs_DoGenericObjectDeletion(obj);
1890 yaffs_SoftDeleteWorker(obj,
1891 obj->variant.fileVariant.top,
1892 obj->variant.fileVariant.
1894 obj->softDeleted = 1;
1899 /* Pruning removes any part of the file structure tree that is beyond the
1900 * bounds of the file (ie that does not point to chunks).
1902 * A file should only get pruned when its size is reduced.
1904 * Before pruning, the chunks must be pulled from the tree and the
1905 * level 0 tnode entries must be zeroed out.
1906 * Could also use this for file deletion, but that's probably better handled
1907 * by a special case.
1909 * This function is recursive. For levels > 0 the function is called again on
1910 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1911 * If there is no data in a subtree then it is pruned.
1914 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1915 __u32 level, int del0)
1924 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1925 if (tn->internal[i]) {
1927 yaffs_PruneWorker(dev, tn->internal[i],
1929 (i == 0) ? del0 : 1);
1932 if (tn->internal[i])
1936 int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
1937 __u32 *map = (__u32 *)tn;
1939 for(i = 0; !hasData && i < tnodeSize_u32; i++){
1945 if (hasData == 0 && del0) {
1946 /* Free and return NULL */
1948 yaffs_FreeTnode(dev, tn);
1958 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1959 yaffs_FileStructure *fStruct)
1966 if (fStruct->topLevel > 0) {
1968 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1970 /* Now we have a tree with all the non-zero branches NULL but the height
1971 * is the same as it was.
1972 * Let's see if we can trim internal tnodes to shorten the tree.
1973 * We can do this if only the 0th element in the tnode is in use
1974 * (ie all the non-zero are NULL)
1977 while (fStruct->topLevel && !done) {
1981 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1982 if (tn->internal[i])
1987 fStruct->top = tn->internal[0];
1988 fStruct->topLevel--;
1989 yaffs_FreeTnode(dev, tn);
1999 /*-------------------- End of File Structure functions.-------------------*/
2001 /* yaffs_CreateFreeObjects creates a bunch more objects and
2002 * adds them to the object free list.
2004 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
2007 yaffs_Object *newObjects;
2008 yaffs_ObjectList *list;
2013 /* make these things */
2014 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
2015 list = YMALLOC(sizeof(yaffs_ObjectList));
2017 if (!newObjects || !list) {
2026 T(YAFFS_TRACE_ALLOCATE,
2027 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
2031 /* Hook them into the free list */
2032 for (i = 0; i < nObjects - 1; i++) {
2033 newObjects[i].siblings.next =
2034 (struct ylist_head *)(&newObjects[i + 1]);
2037 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
2038 dev->freeObjects = newObjects;
2039 dev->nFreeObjects += nObjects;
2040 dev->nObjectsCreated += nObjects;
2042 /* Now add this bunch of Objects to a list for freeing up. */
2044 list->objects = newObjects;
2045 list->next = dev->allocatedObjectList;
2046 dev->allocatedObjectList = list;
2052 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
2053 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
2055 yaffs_Object *tn = NULL;
2057 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2058 tn = YMALLOC(sizeof(yaffs_Object));
2060 dev->nObjectsCreated++;
2062 /* If there are none left make more */
2063 if (!dev->freeObjects)
2064 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
2066 if (dev->freeObjects) {
2067 tn = dev->freeObjects;
2069 (yaffs_Object *) (dev->freeObjects->siblings.next);
2070 dev->nFreeObjects--;
2074 /* Now sweeten it up... */
2076 memset(tn, 0, sizeof(yaffs_Object));
2077 tn->beingCreated = 1;
2081 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
2082 YINIT_LIST_HEAD(&(tn->hardLinks));
2083 YINIT_LIST_HEAD(&(tn->hashLink));
2084 YINIT_LIST_HEAD(&tn->siblings);
2087 /* Now make the directory sane */
2089 tn->parent = dev->rootDir;
2090 ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
2093 /* Add it to the lost and found directory.
2094 * NB Can't put root or lostNFound in lostNFound so
2095 * check if lostNFound exists first
2097 if (dev->lostNFoundDir)
2098 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
2100 tn->beingCreated = 0;
2103 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2108 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
2113 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
2115 obj->fake = 1; /* it is fake so it might have no NAND presence... */
2116 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
2117 obj->unlinkAllowed = 0; /* ... or unlink it */
2120 obj->yst_mode = mode;
2122 obj->hdrChunk = 0; /* Not a valid chunk. */
2129 static void yaffs_UnhashObject(yaffs_Object *tn)
2132 yaffs_Device *dev = tn->myDev;
2134 /* If it is still linked into the bucket list, free from the list */
2135 if (!ylist_empty(&tn->hashLink)) {
2136 ylist_del_init(&tn->hashLink);
2137 bucket = yaffs_HashFunction(tn->objectId);
2138 dev->objectBucket[bucket].count--;
2142 /* FreeObject frees up a Object and puts it back on the free list */
2143 static void yaffs_FreeObject(yaffs_Object *tn)
2145 yaffs_Device *dev = tn->myDev;
2147 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
2153 if (!ylist_empty(&tn->siblings))
2158 /* We're still hooked up to a cached inode.
2159 * Don't delete now, but mark for later deletion
2161 tn->deferedFree = 1;
2165 yaffs_UnhashObject(tn);
2167 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2169 dev->nObjectsCreated--;
2172 /* Link into the free list. */
2173 tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2174 dev->freeObjects = tn;
2175 dev->nFreeObjects++;
2177 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2181 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2183 if (obj->deferedFree)
2184 yaffs_FreeObject(obj);
2188 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2190 /* Free the list of allocated Objects */
2192 yaffs_ObjectList *tmp;
2194 while (dev->allocatedObjectList) {
2195 tmp = dev->allocatedObjectList->next;
2196 YFREE(dev->allocatedObjectList->objects);
2197 YFREE(dev->allocatedObjectList);
2199 dev->allocatedObjectList = tmp;
2202 dev->freeObjects = NULL;
2203 dev->nFreeObjects = 0;
2204 dev->nObjectsCreated = 0;
2207 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2211 dev->allocatedObjectList = NULL;
2212 dev->freeObjects = NULL;
2213 dev->nFreeObjects = 0;
2215 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2216 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2217 dev->objectBucket[i].count = 0;
2221 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2225 int lowest = 999999;
2228 /* Search for the shortest list or one that
2232 for (i = 0; i < 10 && lowest > 4; i++) {
2233 dev->bucketFinder++;
2234 dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
2235 if (dev->objectBucket[dev->bucketFinder].count < lowest) {
2236 lowest = dev->objectBucket[dev->bucketFinder].count;
2237 l = dev->bucketFinder;
2245 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2247 int bucket = yaffs_FindNiceObjectBucket(dev);
2249 /* Now find an object value that has not already been taken
2250 * by scanning the list.
2254 struct ylist_head *i;
2256 __u32 n = (__u32) bucket;
2258 /* yaffs_CheckObjectHashSanity(); */
2262 n += YAFFS_NOBJECT_BUCKETS;
2263 if (1 || dev->objectBucket[bucket].count > 0) {
2264 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2265 /* If there is already one in the list */
2266 if (i && ylist_entry(i, yaffs_Object,
2267 hashLink)->objectId == n) {
2277 static void yaffs_HashObject(yaffs_Object *in)
2279 int bucket = yaffs_HashFunction(in->objectId);
2280 yaffs_Device *dev = in->myDev;
2282 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2283 dev->objectBucket[bucket].count++;
2286 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2288 int bucket = yaffs_HashFunction(number);
2289 struct ylist_head *i;
2292 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2293 /* Look if it is in the list */
2295 in = ylist_entry(i, yaffs_Object, hashLink);
2296 if (in->objectId == number) {
2298 /* Don't tell the VFS about this one if it is defered free */
2299 if (in->deferedFree)
2310 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2311 yaffs_ObjectType type)
2313 yaffs_Object *theObject=NULL;
2314 yaffs_Tnode *tn = NULL;
2317 number = yaffs_CreateNewObjectNumber(dev);
2319 if (type == YAFFS_OBJECT_TYPE_FILE) {
2320 tn = yaffs_GetTnode(dev);
2325 theObject = yaffs_AllocateEmptyObject(dev);
2328 yaffs_FreeTnode(dev,tn);
2334 theObject->fake = 0;
2335 theObject->renameAllowed = 1;
2336 theObject->unlinkAllowed = 1;
2337 theObject->objectId = number;
2338 yaffs_HashObject(theObject);
2339 theObject->variantType = type;
2340 #ifdef CONFIG_YAFFS_WINCE
2341 yfsd_WinFileTimeNow(theObject->win_atime);
2342 theObject->win_ctime[0] = theObject->win_mtime[0] =
2343 theObject->win_atime[0];
2344 theObject->win_ctime[1] = theObject->win_mtime[1] =
2345 theObject->win_atime[1];
2349 theObject->yst_atime = theObject->yst_mtime =
2350 theObject->yst_ctime = Y_CURRENT_TIME;
2353 case YAFFS_OBJECT_TYPE_FILE:
2354 theObject->variant.fileVariant.fileSize = 0;
2355 theObject->variant.fileVariant.scannedFileSize = 0;
2356 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2357 theObject->variant.fileVariant.topLevel = 0;
2358 theObject->variant.fileVariant.top = tn;
2360 case YAFFS_OBJECT_TYPE_DIRECTORY:
2361 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2363 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2366 case YAFFS_OBJECT_TYPE_SYMLINK:
2367 case YAFFS_OBJECT_TYPE_HARDLINK:
2368 case YAFFS_OBJECT_TYPE_SPECIAL:
2369 /* No action required */
2371 case YAFFS_OBJECT_TYPE_UNKNOWN:
2372 /* todo this should not happen */
2380 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2382 yaffs_ObjectType type)
2384 yaffs_Object *theObject = NULL;
2387 theObject = yaffs_FindObjectByNumber(dev, number);
2390 theObject = yaffs_CreateNewObject(dev, number, type);
2397 static YCHAR *yaffs_CloneString(const YCHAR *str)
2399 YCHAR *newStr = NULL;
2405 len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
2406 newStr = YMALLOC((len + 1) * sizeof(YCHAR));
2408 yaffs_strncpy(newStr, str,len);
2416 * Mknod (create) a new object.
2417 * equivalentObject only has meaning for a hard link;
2418 * aliasString only has meaning for a symlink.
2419 * rdev only has meaning for devices (a subset of special objects)
2422 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2423 yaffs_Object *parent,
2428 yaffs_Object *equivalentObject,
2429 const YCHAR *aliasString, __u32 rdev)
2434 yaffs_Device *dev = parent->myDev;
2436 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2437 if (yaffs_FindObjectByName(parent, name))
2440 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2441 str = yaffs_CloneString(aliasString);
2446 in = yaffs_CreateNewObject(dev, -1, type);
2461 in->variantType = type;
2463 in->yst_mode = mode;
2465 #ifdef CONFIG_YAFFS_WINCE
2466 yfsd_WinFileTimeNow(in->win_atime);
2467 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2468 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2471 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2473 in->yst_rdev = rdev;
2477 in->nDataChunks = 0;
2479 yaffs_SetObjectName(in, name);
2482 yaffs_AddObjectToDirectory(parent, in);
2484 in->myDev = parent->myDev;
2487 case YAFFS_OBJECT_TYPE_SYMLINK:
2488 in->variant.symLinkVariant.alias = str;
2490 case YAFFS_OBJECT_TYPE_HARDLINK:
2491 in->variant.hardLinkVariant.equivalentObject =
2493 in->variant.hardLinkVariant.equivalentObjectId =
2494 equivalentObject->objectId;
2495 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2497 case YAFFS_OBJECT_TYPE_FILE:
2498 case YAFFS_OBJECT_TYPE_DIRECTORY:
2499 case YAFFS_OBJECT_TYPE_SPECIAL:
2500 case YAFFS_OBJECT_TYPE_UNKNOWN:
2505 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2506 /* Could not create the object header, fail the creation */
2507 yaffs_DeleteObject(in);
2511 yaffs_UpdateParent(parent);
2517 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2518 __u32 mode, __u32 uid, __u32 gid)
2520 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2521 uid, gid, NULL, NULL, 0);
2524 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2525 __u32 mode, __u32 uid, __u32 gid)
2527 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2528 mode, uid, gid, NULL, NULL, 0);
2531 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2532 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2534 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2535 uid, gid, NULL, NULL, rdev);
2538 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2539 __u32 mode, __u32 uid, __u32 gid,
2542 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2543 uid, gid, NULL, alias, 0);
2546 /* yaffs_Link returns the object id of the equivalent object.*/
2547 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2548 yaffs_Object *equivalentObject)
2550 /* Get the real object in case we were fed a hard link as an equivalent object */
2551 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2553 if (yaffs_MknodObject
2554 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2555 equivalentObject, NULL, 0)) {
2556 return equivalentObject;
2563 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2564 const YCHAR *newName, int force, int shadows)
2569 yaffs_Object *existingTarget;
2572 newDir = obj->parent; /* use the old directory */
2574 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2575 T(YAFFS_TRACE_ALWAYS,
2577 ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2582 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2583 if (obj->myDev->param.isYaffs2)
2584 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2586 unlinkOp = (newDir == obj->myDev->unlinkedDir
2587 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2589 deleteOp = (newDir == obj->myDev->deletedDir);
2591 existingTarget = yaffs_FindObjectByName(newDir, newName);
2593 /* If the object is a file going into the unlinked directory,
2594 * then it is OK to just stuff it in since duplicate names are allowed.
2595 * else only proceed if the new name does not exist and if we're putting
2596 * it into a directory.
2603 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2604 yaffs_SetObjectName(obj, newName);
2607 yaffs_AddObjectToDirectory(newDir, obj);
2612 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2613 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2620 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2621 yaffs_Object *newDir, const YCHAR *newName)
2623 yaffs_Object *obj = NULL;
2624 yaffs_Object *existingTarget = NULL;
2630 if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2632 if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2635 dev = oldDir->myDev;
2637 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2638 /* Special case for case insemsitive systems (eg. WinCE).
2639 * While look-up is case insensitive, the name isn't.
2640 * Therefore we might want to change x.txt to X.txt
2642 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2646 if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
2650 obj = yaffs_FindObjectByName(oldDir, oldName);
2652 if (obj && obj->renameAllowed) {
2654 /* Now do the handling for an existing target, if there is one */
2656 existingTarget = yaffs_FindObjectByName(newDir, newName);
2657 if (existingTarget &&
2658 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2659 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2660 /* There is a target that is a non-empty directory, so we fail */
2661 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2662 } else if (existingTarget && existingTarget != obj) {
2663 /* Nuke the target first, using shadowing,
2664 * but only if it isn't the same object.
2666 * Note we must disable gc otherwise it can mess up the shadowing.
2670 yaffs_ChangeObjectName(obj, newDir, newName, force,
2671 existingTarget->objectId);
2672 existingTarget->isShadowed = 1;
2673 yaffs_UnlinkObject(existingTarget);
2677 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2679 yaffs_UpdateParent(oldDir);
2680 if(newDir != oldDir)
2681 yaffs_UpdateParent(newDir);
2688 /*------------------------- Block Management and Page Allocation ----------------*/
2690 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2692 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2694 dev->blockInfo = NULL;
2695 dev->chunkBits = NULL;
2697 dev->allocationBlock = -1; /* force it to get a new one */
2699 /* If the first allocation strategy fails, thry the alternate one */
2700 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2701 if (!dev->blockInfo) {
2702 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2703 dev->blockInfoAlt = 1;
2705 dev->blockInfoAlt = 0;
2707 if (dev->blockInfo) {
2708 /* Set up dynamic blockinfo stuff. */
2709 dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
2710 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2711 if (!dev->chunkBits) {
2712 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2713 dev->chunkBitsAlt = 1;
2715 dev->chunkBitsAlt = 0;
2718 if (dev->blockInfo && dev->chunkBits) {
2719 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2720 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2727 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2729 if (dev->blockInfoAlt && dev->blockInfo)
2730 YFREE_ALT(dev->blockInfo);
2731 else if (dev->blockInfo)
2732 YFREE(dev->blockInfo);
2734 dev->blockInfoAlt = 0;
2736 dev->blockInfo = NULL;
2738 if (dev->chunkBitsAlt && dev->chunkBits)
2739 YFREE_ALT(dev->chunkBits);
2740 else if (dev->chunkBits)
2741 YFREE(dev->chunkBits);
2742 dev->chunkBitsAlt = 0;
2743 dev->chunkBits = NULL;
2746 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2747 yaffs_BlockInfo *bi)
2750 if (!dev->param.isYaffs2)
2751 return 1; /* disqualification only applies to yaffs2. */
2753 if (!bi->hasShrinkHeader)
2754 return 1; /* can gc */
2756 yaffs_FindOldestDirtySequence(dev);
2758 /* Can't do gc of this block if there are any blocks older than this one that have
2761 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2765 * yaffs_FindRefreshBlock()
2766 * periodically finds the oldest full block by sequence number for refreshing.
2769 static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev)
2774 __u32 oldestSequence = 0;
2776 yaffs_BlockInfo *bi;
2779 * If refresh period < 10 then refreshing is disabled.
2781 if(dev->param.refreshPeriod < 10 ||
2782 !dev->param.isYaffs2)
2786 * Fix broken values.
2788 if(dev->refreshSkip > dev->param.refreshPeriod)
2789 dev->refreshSkip = dev->param.refreshPeriod;
2791 if(dev->refreshSkip > 0){
2797 * Refresh skip is now zero.
2798 * We'll do a refresh this time around....
2799 * Update the refresh skip and find the oldest block.
2801 dev->refreshSkip = dev->param.refreshPeriod;
2802 dev->refreshCount++;
2804 for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
2806 bi = yaffs_GetBlockInfo(dev, b);
2809 if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
2812 bi->sequenceNumber < oldestSequence){
2814 oldestSequence = bi->sequenceNumber;
2821 (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
2822 dev->refreshCount, oldest, oldestSequence));
2829 * FindDiretiestBlock is used to select the dirtiest block (or close enough)
2830 * for garbage collection.
2833 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2836 int b = dev->currentDirtyChecker;
2842 int prioritised = 0;
2843 yaffs_BlockInfo *bi;
2844 int pendingPrioritisedExist = 0;
2846 /* First let's see if we need to grab a prioritised block */
2847 if (dev->hasPendingPrioritisedGCs) {
2848 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2850 bi = yaffs_GetBlockInfo(dev, i);
2851 /* yaffs_VerifyBlock(dev,bi,i); */
2853 if (bi->gcPrioritise) {
2854 pendingPrioritisedExist = 1;
2855 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2856 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2857 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2860 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2865 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2866 dev->hasPendingPrioritisedGCs = 0;
2869 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2871 * else (we're doing a leasurely gc), then we only bother to do this if the
2872 * block has only a few pages in use.
2875 dev->nonAggressiveSkip--;
2877 if (!aggressive && (dev->nonAggressiveSkip > 0))
2882 (aggressive) ? dev->param.nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2886 dev->internalEndBlock - dev->internalStartBlock + 1;
2889 dev->internalEndBlock - dev->internalStartBlock + 1;
2890 iterations = iterations / 16;
2891 if (iterations > 200)
2895 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2897 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2898 b = dev->internalStartBlock;
2900 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2901 T(YAFFS_TRACE_ERROR,
2902 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2906 bi = yaffs_GetBlockInfo(dev, b);
2908 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2909 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2910 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2912 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2916 dev->currentDirtyChecker = b;
2920 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2921 dev->param.nChunksPerBlock - pagesInUse, prioritised));
2925 dev->nonAggressiveSkip = 4;
2930 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2932 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2936 /* If the block is still healthy erase it and mark as clean.
2937 * If the block has had a data failure, then retire it.
2940 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2941 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2942 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2944 yaffs_ClearOldestDirtySequence(dev,bi);
2946 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2948 if (!bi->needsRetiring) {
2949 yaffs_InvalidateCheckpoint(dev);
2950 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2952 dev->nErasureFailures++;
2953 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2954 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2959 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2961 for (i = 0; i < dev->param.nChunksPerBlock; i++) {
2962 if (!yaffs_CheckChunkErased
2963 (dev, blockNo * dev->param.nChunksPerBlock + i)) {
2964 T(YAFFS_TRACE_ERROR,
2966 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2967 TENDSTR), blockNo, i));
2973 /* Clean it up... */
2974 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2975 bi->sequenceNumber = 0;
2976 dev->nErasedBlocks++;
2978 bi->softDeletions = 0;
2979 bi->hasShrinkHeader = 0;
2980 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2981 bi->gcPrioritise = 0;
2982 yaffs_ClearChunkBits(dev, blockNo);
2984 T(YAFFS_TRACE_ERASE,
2985 (TSTR("Erased block %d" TENDSTR), blockNo));
2987 dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
2989 yaffs_RetireBlock(dev, blockNo);
2990 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2991 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2995 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2999 yaffs_BlockInfo *bi;
3001 if (dev->nErasedBlocks < 1) {
3002 /* Hoosterman we've got a problem.
3003 * Can't get space to gc
3005 T(YAFFS_TRACE_ERROR,
3006 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
3011 /* Find an empty block. */
3013 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
3014 dev->allocationBlockFinder++;
3015 if (dev->allocationBlockFinder < dev->internalStartBlock
3016 || dev->allocationBlockFinder > dev->internalEndBlock) {
3017 dev->allocationBlockFinder = dev->internalStartBlock;
3020 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
3022 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
3023 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
3024 dev->sequenceNumber++;
3025 bi->sequenceNumber = dev->sequenceNumber;
3026 dev->nErasedBlocks--;
3027 T(YAFFS_TRACE_ALLOCATE,
3028 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
3029 dev->allocationBlockFinder, dev->sequenceNumber,
3030 dev->nErasedBlocks));
3031 return dev->allocationBlockFinder;
3035 T(YAFFS_TRACE_ALWAYS,
3037 ("yaffs tragedy: no more erased blocks, but there should have been %d"
3038 TENDSTR), dev->nErasedBlocks));
3045 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
3047 if (!dev->nCheckpointBlocksRequired &&
3048 dev->param.isYaffs2) {
3049 /* Not a valid value so recalculate */
3052 int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
3053 int tnodeSize = yaffs_CalcTnodeSize(dev);
3055 nBytes += sizeof(yaffs_CheckpointValidity);
3056 nBytes += sizeof(yaffs_CheckpointDevice);
3057 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
3058 nBytes += devBlocks * dev->chunkBitmapStride;
3059 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
3060 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
3061 nBytes += sizeof(yaffs_CheckpointValidity);
3062 nBytes += sizeof(__u32); /* checksum*/
3064 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
3066 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
3068 dev->nCheckpointBlocksRequired = nBlocks;
3071 return dev->nCheckpointBlocksRequired;
3075 * Check if there's space to allocate...
3076 * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
3078 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
3081 int reservedBlocks = dev->param.nReservedBlocks;
3082 int checkpointBlocks;
3084 if (dev->param.isYaffs2) {
3085 checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) -
3086 dev->blocksInCheckpoint;
3087 if (checkpointBlocks < 0)
3088 checkpointBlocks = 0;
3090 checkpointBlocks = 0;
3093 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
3095 return (dev->nFreeChunks > (reservedChunks + nChunks));
3098 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
3099 yaffs_BlockInfo **blockUsedPtr)
3102 yaffs_BlockInfo *bi;
3104 if (dev->allocationBlock < 0) {
3105 /* Get next block to allocate off */
3106 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
3107 dev->allocationPage = 0;
3110 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
3111 /* Not enough space to allocate unless we're allowed to use the reserve. */
3115 if (dev->nErasedBlocks < dev->param.nReservedBlocks
3116 && dev->allocationPage == 0) {
3117 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
3120 /* Next page please.... */
3121 if (dev->allocationBlock >= 0) {
3122 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3124 retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
3125 dev->allocationPage;
3127 yaffs_SetChunkBit(dev, dev->allocationBlock,
3128 dev->allocationPage);
3130 dev->allocationPage++;
3134 /* If the block is full set the state to full */
3135 if (dev->allocationPage >= dev->param.nChunksPerBlock) {
3136 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3137 dev->allocationBlock = -1;
3146 T(YAFFS_TRACE_ERROR,
3147 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3152 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3156 n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3158 if (dev->allocationBlock > 0)
3159 n += (dev->param.nChunksPerBlock - dev->allocationPage);
3166 * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3167 * if we don't want to write to it.
3169 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3171 if(dev->allocationBlock > 0){
3172 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3173 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3174 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3175 dev->allocationBlock = -1;
3181 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3187 int retVal = YAFFS_OK;
3190 int isCheckpointBlock;
3194 int chunksBefore = yaffs_GetErasedChunks(dev);
3197 yaffs_ExtendedTags tags;
3199 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3201 yaffs_Object *object;
3203 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3206 T(YAFFS_TRACE_TRACING,
3207 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3210 bi->hasShrinkHeader,
3213 /*yaffs_VerifyFreeChunks(dev); */
3215 if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3216 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3218 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
3220 /* Take off the number of soft deleted entries because
3221 * they're going to get really deleted during GC.
3223 if(dev->gcChunk == 0) /* first time through for this block */
3224 dev->nFreeChunks -= bi->softDeletions;
3228 if (isCheckpointBlock ||
3229 !yaffs_StillSomeChunkBits(dev, block)) {
3230 T(YAFFS_TRACE_TRACING,
3232 ("Collecting block %d that has no chunks in use" TENDSTR),
3234 yaffs_BlockBecameDirty(dev, block);
3237 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3239 yaffs_VerifyBlock(dev, bi, block);
3241 maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 10;
3242 oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
3244 for (/* init already done */;
3245 retVal == YAFFS_OK &&
3246 dev->gcChunk < dev->param.nChunksPerBlock &&
3247 (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3249 dev->gcChunk++, oldChunk++) {
3250 if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3252 /* This page is in use and might need to be copied off */
3258 yaffs_InitialiseTags(&tags);
3260 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3264 yaffs_FindObjectByNumber(dev,
3267 T(YAFFS_TRACE_GC_DETAIL,
3269 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3270 dev->gcChunk, tags.objectId, tags.chunkId,
3273 if (object && !yaffs_SkipVerification(dev)) {
3274 if (tags.chunkId == 0)
3275 matchingChunk = object->hdrChunk;
3276 else if (object->softDeleted)
3277 matchingChunk = oldChunk; /* Defeat the test */
3279 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3281 if (oldChunk != matchingChunk)
3282 T(YAFFS_TRACE_ERROR,
3283 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3284 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3289 T(YAFFS_TRACE_ERROR,
3291 ("page %d in gc has no object: %d %d %d "
3293 tags.objectId, tags.chunkId, tags.byteCount));
3298 object->softDeleted &&
3299 tags.chunkId != 0) {
3300 /* Data chunk in a soft deleted file, throw it away
3301 * It's a soft deleted data chunk,
3302 * No need to copy this, just forget about it and
3303 * fix up the object.
3306 object->nDataChunks--;
3308 if (object->nDataChunks <= 0) {
3309 /* remeber to clean up the object */
3310 dev->gcCleanupList[cleanups] =
3316 /* Todo object && object->deleted && object->nDataChunks == 0 */
3317 /* Deleted object header with no data chunks.
3318 * Can be discarded and the file deleted.
3320 object->hdrChunk = 0;
3321 yaffs_FreeTnode(object->myDev,
3324 object->variant.fileVariant.top = NULL;
3325 yaffs_DoGenericObjectDeletion(object);
3327 } else if (object) {
3328 /* It's either a data chunk in a live file or
3329 * an ObjectHeader, so we're interested in it.
3330 * NB Need to keep the ObjectHeaders of deleted files
3331 * until the whole file has been deleted off
3333 tags.serialNumber++;
3337 if (tags.chunkId == 0) {
3338 /* It is an object Id,
3339 * We need to nuke the shrinkheader flags first
3340 * Also need to clean up shadowing.
3341 * We no longer want the shrinkHeader flag since its work is done
3342 * and if it is left in place it will mess up scanning.
3345 yaffs_ObjectHeader *oh;
3346 oh = (yaffs_ObjectHeader *)buffer;
3349 tags.extraIsShrinkHeader = 0;
3351 oh->shadowsObject = 0;
3352 oh->inbandShadowsObject = 0;
3353 tags.extraShadows = 0;
3355 /* Update file size */
3356 if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
3357 oh->fileSize = object->variant.fileVariant.fileSize;
3358 tags.extraFileLength = oh->fileSize;
3361 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3363 yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
3366 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3369 retVal = YAFFS_FAIL;
3372 /* Ok, now fix up the Tnodes etc. */
3374 if (tags.chunkId == 0) {
3376 object->hdrChunk = newChunk;
3377 object->serial = tags.serialNumber;
3379 /* It's a data chunk */
3381 ok = yaffs_PutChunkIntoFile
3389 if (retVal == YAFFS_OK)
3390 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3395 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3398 /* Do any required cleanups */
3399 for (i = 0; i < cleanups; i++) {
3400 /* Time to delete the file too */
3402 yaffs_FindObjectByNumber(dev,
3403 dev->gcCleanupList[i]);
3405 yaffs_FreeTnode(dev,
3406 object->variant.fileVariant.
3408 object->variant.fileVariant.top = NULL;
3411 ("yaffs: About to finally delete object %d"
3412 TENDSTR), object->objectId));
3413 yaffs_DoGenericObjectDeletion(object);
3414 object->myDev->nDeletedFiles--;
3421 yaffs_VerifyCollectedBlock(dev, bi, block);
3425 /* If the gc completed then clear the current gcBlock so that we find another. */
3426 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3427 chunksAfter = yaffs_GetErasedChunks(dev);
3428 if (chunksBefore >= chunksAfter) {
3431 ("gc did not increase free chunks before %d after %d"
3432 TENDSTR), chunksBefore, chunksAfter));
3443 /* New garbage collector
3444 * If we're very low on erased blocks then we do aggressive garbage collection
3445 * otherwise we do "leasurely" garbage collection.
3446 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3447 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3449 * The idea is to help clear out space in a more spread-out manner.
3450 * Dunno if it really does anything useful.
3452 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3456 int gcOk = YAFFS_OK;
3459 int checkpointBlockAdjust;
3461 if (dev->isDoingGC) {
3462 /* Bail out so we don't get recursive gc */
3466 /* This loop should pass the first time.
3467 * We'll only see looping here if the erase of the collected block fails.
3473 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3474 if (checkpointBlockAdjust < 0)
3475 checkpointBlockAdjust = 0;
3477 /* If we need a block soon then do aggressive gc.*/
3478 if (dev->nErasedBlocks < (dev->param.nReservedBlocks + checkpointBlockAdjust + 2))
3483 /* If we don't already have a block being gc'd then see if we should start another */
3485 if (dev->gcBlock < 1 && !aggressive) {
3486 dev->gcBlock = yaffs_FindRefreshBlock(dev);
3489 if (dev->gcBlock < 1) {
3490 dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3494 block = dev->gcBlock;
3497 dev->garbageCollections++;
3499 dev->passiveGarbageCollections++;
3503 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3504 dev->nErasedBlocks, aggressive));
3506 gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3509 if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && block > 0) {
3512 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3513 TENDSTR), dev->nErasedBlocks, maxTries, block));
3515 } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
3519 return aggressive ? gcOk : YAFFS_OK;
3522 /*------------------------- TAGS --------------------------------*/
3524 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3527 return (tags->chunkId == chunkInObject &&
3528 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3533 /*-------------------- Data file manipulation -----------------*/
3535 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3536 yaffs_ExtendedTags *tags)
3538 /*Get the Tnode, then get the level 0 offset chunk offset */
3541 yaffs_ExtendedTags localTags;
3544 yaffs_Device *dev = in->myDev;
3547 /* Passed a NULL, so use our own tags space */
3551 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3554 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3557 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3563 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3564 yaffs_ExtendedTags *tags)
3566 /* Get the Tnode, then get the level 0 offset chunk offset */
3569 yaffs_ExtendedTags localTags;
3571 yaffs_Device *dev = in->myDev;
3575 /* Passed a NULL, so use our own tags space */
3579 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3583 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3586 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3589 /* Delete the entry in the filestructure (if found) */
3591 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3597 #ifdef YAFFS_PARANOID
3599 static int yaffs_CheckFileSanity(yaffs_Object *in)
3607 yaffs_Tags localTags;
3608 yaffs_Tags *tags = &localTags;
3612 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3615 objId = in->objectId;
3616 fSize = in->variant.fileVariant.fileSize;
3618 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3620 for (chunk = 1; chunk <= nChunks; chunk++) {
3621 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3626 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3628 if (yaffs_CheckChunkBits
3629 (dev, theChunk / dev->param.nChunksPerBlock,
3630 theChunk % dev->param.nChunksPerBlock)) {
3632 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3636 (tags, in->objectId, chunk, chunkDeleted)) {
3646 /* T(("No level 0 found for %d\n", chunk)); */
3650 return failed ? YAFFS_FAIL : YAFFS_OK;
3655 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3656 int chunkInNAND, int inScan)
3658 /* NB inScan is zero unless scanning.
3659 * For forward scanning, inScan is > 0;
3660 * for backward scanning inScan is < 0
3662 * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3666 yaffs_Device *dev = in->myDev;
3668 yaffs_ExtendedTags existingTags;
3669 yaffs_ExtendedTags newTags;
3670 unsigned existingSerial, newSerial;
3672 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3673 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3674 * If it is not during Scanning then something went wrong!
3677 T(YAFFS_TRACE_ERROR,
3679 ("yaffs tragedy:attempt to put data chunk into a non-file"
3684 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3688 tn = yaffs_AddOrFindLevel0Tnode(dev,
3689 &in->variant.fileVariant,
3696 /* Dummy insert, bail now */
3699 existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3702 /* If we're scanning then we need to test for duplicates
3703 * NB This does not need to be efficient since it should only ever
3704 * happen when the power fails during a write, then only one
3705 * chunk should ever be affected.
3707 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3708 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3711 if (existingChunk > 0) {
3712 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3713 * thus we have to do a FindChunkInFile to get the real chunk id.
3715 * We have a duplicate now we need to decide which one to use:
3717 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3718 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3719 * YAFFS1: Get both sets of tags and compare serial numbers.
3723 /* Only do this for forward scanning */
3724 yaffs_ReadChunkWithTagsFromNAND(dev,
3728 /* Do a proper find */
3730 yaffs_FindChunkInFile(in, chunkInInode,
3734 if (existingChunk <= 0) {
3735 /*Hoosterman - how did this happen? */
3737 T(YAFFS_TRACE_ERROR,
3739 ("yaffs tragedy: existing chunk < 0 in scan"
3744 /* NB The deleted flags should be false, otherwise the chunks will
3745 * not be loaded during a scan
3749 newSerial = newTags.serialNumber;
3750 existingSerial = existingTags.serialNumber;
3754 (in->myDev->param.isYaffs2 ||
3755 existingChunk <= 0 ||
3756 ((existingSerial + 1) & 3) == newSerial)) {
3757 /* Forward scanning.
3759 * Delete the old one and drop through to update the tnode
3761 yaffs_DeleteChunk(dev, existingChunk, 1,
3764 /* Backward scanning or we want to use the existing one
3766 * Delete the new one and return early so that the tnode isn't changed
3768 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3776 if (existingChunk == 0)
3779 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3784 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3787 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3789 if (chunkInNAND >= 0)
3790 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3793 T(YAFFS_TRACE_NANDACCESS,
3794 (TSTR("Chunk %d not found zero instead" TENDSTR),
3796 /* get sane (zero) data if you read a hole */
3797 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3803 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3807 yaffs_ExtendedTags tags;
3808 yaffs_BlockInfo *bi;
3814 block = chunkId / dev->param.nChunksPerBlock;
3815 page = chunkId % dev->param.nChunksPerBlock;
3818 if (!yaffs_CheckChunkBit(dev, block, page))
3819 T(YAFFS_TRACE_VERIFY,
3820 (TSTR("Deleting invalid chunk %d"TENDSTR),
3823 bi = yaffs_GetBlockInfo(dev, block);
3825 yaffs_UpdateOldestDirtySequence(dev,bi);
3827 T(YAFFS_TRACE_DELETION,
3828 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3831 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
3833 yaffs_InitialiseTags(&tags);
3835 tags.chunkDeleted = 1;
3837 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3838 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3840 dev->nUnmarkedDeletions++;
3843 /* Pull out of the management area.
3844 * If the whole block became dirty, this will kick off an erasure.
3846 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3847 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3848 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3849 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3852 yaffs_ClearChunkBit(dev, block, page);
3856 if (bi->pagesInUse == 0 &&
3857 !bi->hasShrinkHeader &&
3858 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3859 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3860 yaffs_BlockBecameDirty(dev, block);
3867 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3868 const __u8 *buffer, int nBytes,
3871 /* Find old chunk Need to do this to get serial number
3872 * Write new one and patch into tree.
3873 * Invalidate old tags.
3877 yaffs_ExtendedTags prevTags;
3880 yaffs_ExtendedTags newTags;
3882 yaffs_Device *dev = in->myDev;
3884 yaffs_CheckGarbageCollection(dev);
3886 /* Get the previous chunk at this location in the file if it exists.
3887 * If it does not exist then put a zero into the tree. This creates
3888 * the tnode now, rather than later when it is harder to clean up.
3890 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3891 if(prevChunkId < 1 &&
3892 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
3895 /* Set up new tags */
3896 yaffs_InitialiseTags(&newTags);
3898 newTags.chunkId = chunkInInode;
3899 newTags.objectId = in->objectId;
3900 newTags.serialNumber =
3901 (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3902 newTags.byteCount = nBytes;
3904 if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
3905 T(YAFFS_TRACE_ERROR,
3906 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3912 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3915 if (newChunkId > 0) {
3916 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3918 if (prevChunkId > 0)
3919 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3921 yaffs_CheckFileSanity(in);
3927 /* UpdateObjectHeader updates the header on NAND for an object.
3928 * If name is not NULL, then that new name is used.
3930 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3931 int isShrink, int shadows)
3934 yaffs_BlockInfo *bi;
3936 yaffs_Device *dev = in->myDev;
3943 yaffs_ExtendedTags newTags;
3944 yaffs_ExtendedTags oldTags;
3945 YCHAR *alias = NULL;
3947 __u8 *buffer = NULL;
3948 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3950 yaffs_ObjectHeader *oh = NULL;
3952 yaffs_strcpy(oldName, _Y("silly old name"));
3956 in == dev->rootDir || /* The rootDir should also be saved */
3959 yaffs_CheckGarbageCollection(dev);
3960 yaffs_CheckObjectDetailsLoaded(in);
3962 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3963 oh = (yaffs_ObjectHeader *) buffer;
3965 prevChunkId = in->hdrChunk;
3967 if (prevChunkId > 0) {
3968 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3971 yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3973 memcpy(oldName, oh->name, sizeof(oh->name));
3976 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3978 oh->type = in->variantType;
3979 oh->yst_mode = in->yst_mode;
3980 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3982 #ifdef CONFIG_YAFFS_WINCE
3983 oh->win_atime[0] = in->win_atime[0];
3984 oh->win_ctime[0] = in->win_ctime[0];
3985 oh->win_mtime[0] = in->win_mtime[0];
3986 oh->win_atime[1] = in->win_atime[1];
3987 oh->win_ctime[1] = in->win_ctime[1];
3988 oh->win_mtime[1] = in->win_mtime[1];
3990 oh->yst_uid = in->yst_uid;
3991 oh->yst_gid = in->yst_gid;
3992 oh->yst_atime = in->yst_atime;
3993 oh->yst_mtime = in->yst_mtime;
3994 oh->yst_ctime = in->yst_ctime;
3995 oh->yst_rdev = in->yst_rdev;
3998 oh->parentObjectId = in->parent->objectId;
4000 oh->parentObjectId = 0;
4002 if (name && *name) {
4003 memset(oh->name, 0, sizeof(oh->name));
4004 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
4005 } else if (prevChunkId > 0)
4006 memcpy(oh->name, oldName, sizeof(oh->name));
4008 memset(oh->name, 0, sizeof(oh->name));
4010 oh->isShrink = isShrink;
4012 switch (in->variantType) {
4013 case YAFFS_OBJECT_TYPE_UNKNOWN:
4014 /* Should not happen */
4016 case YAFFS_OBJECT_TYPE_FILE:
4018 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
4019 || oh->parentObjectId ==
4020 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
4021 fileVariant.fileSize;
4023 case YAFFS_OBJECT_TYPE_HARDLINK:
4024 oh->equivalentObjectId =
4025 in->variant.hardLinkVariant.equivalentObjectId;
4027 case YAFFS_OBJECT_TYPE_SPECIAL:
4030 case YAFFS_OBJECT_TYPE_DIRECTORY:
4033 case YAFFS_OBJECT_TYPE_SYMLINK:
4034 alias = in->variant.symLinkVariant.alias;
4036 alias = _Y("no alias");
4037 yaffs_strncpy(oh->alias,
4039 YAFFS_MAX_ALIAS_LENGTH);
4040 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
4045 yaffs_InitialiseTags(&newTags);
4047 newTags.chunkId = 0;
4048 newTags.objectId = in->objectId;
4049 newTags.serialNumber = in->serial;
4051 /* Add extra info for file header */
4053 newTags.extraHeaderInfoAvailable = 1;
4054 newTags.extraParentObjectId = oh->parentObjectId;
4055 newTags.extraFileLength = oh->fileSize;
4056 newTags.extraIsShrinkHeader = oh->isShrink;
4057 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
4058 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
4059 newTags.extraObjectType = in->variantType;
4061 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
4063 /* Create new chunk in NAND */
4065 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
4066 (prevChunkId > 0) ? 1 : 0);
4068 if (newChunkId >= 0) {
4070 in->hdrChunk = newChunkId;
4072 if (prevChunkId > 0) {
4073 yaffs_DeleteChunk(dev, prevChunkId, 1,
4077 if (!yaffs_ObjectHasCachedWriteData(in))
4080 /* If this was a shrink, then mark the block that the chunk lives on */
4082 bi = yaffs_GetBlockInfo(in->myDev,
4083 newChunkId / in->myDev->param.nChunksPerBlock);
4084 bi->hasShrinkHeader = 1;
4089 retVal = newChunkId;
4094 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
4099 /*------------------------ Short Operations Cache ----------------------------------------
4100 * In many situations where there is no high level buffering (eg WinCE) a lot of
4101 * reads might be short sequential reads, and a lot of writes may be short
4102 * sequential writes. eg. scanning/writing a jpeg file.
4103 * In these cases, a short read/write cache can provide a huge perfomance benefit
4104 * with dumb-as-a-rock code.
4105 * In Linux, the page cache provides read buffering aand the short op cache provides write
4108 * There are a limited number (~10) of cache chunks per device so that we don't
4109 * need a very intelligent search.
4112 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
4114 yaffs_Device *dev = obj->myDev;
4116 yaffs_ChunkCache *cache;
4117 int nCaches = obj->myDev->param.nShortOpCaches;
4119 for (i = 0; i < nCaches; i++) {
4120 cache = &dev->srCache[i];
4121 if (cache->object == obj &&
4130 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
4132 yaffs_Device *dev = obj->myDev;
4133 int lowest = -99; /* Stop compiler whining. */
4135 yaffs_ChunkCache *cache;
4136 int chunkWritten = 0;
4137 int nCaches = obj->myDev->param.nShortOpCaches;
4143 /* Find the dirty cache for this object with the lowest chunk id. */
4144 for (i = 0; i < nCaches; i++) {
4145 if (dev->srCache[i].object == obj &&
4146 dev->srCache[i].dirty) {
4148 || dev->srCache[i].chunkId <
4150 cache = &dev->srCache[i];
4151 lowest = cache->chunkId;
4156 if (cache && !cache->locked) {
4157 /* Write it out and free it up */
4160 yaffs_WriteChunkDataToObject(cache->object,
4166 cache->object = NULL;
4169 } while (cache && chunkWritten > 0);
4172 /* Hoosterman, disk full while writing cache out. */
4173 T(YAFFS_TRACE_ERROR,
4174 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4181 /*yaffs_FlushEntireDeviceCache(dev)
4186 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4189 int nCaches = dev->param.nShortOpCaches;
4192 /* Find a dirty object in the cache and flush it...
4193 * until there are no further dirty objects.
4197 for (i = 0; i < nCaches && !obj; i++) {
4198 if (dev->srCache[i].object &&
4199 dev->srCache[i].dirty)
4200 obj = dev->srCache[i].object;
4204 yaffs_FlushFilesChunkCache(obj);
4211 /* Grab us a cache chunk for use.
4212 * First look for an empty one.
4213 * Then look for the least recently used non-dirty one.
4214 * Then look for the least recently used dirty one...., flush and look again.
4216 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4220 if (dev->param.nShortOpCaches > 0) {
4221 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4222 if (!dev->srCache[i].object)
4223 return &dev->srCache[i];
4230 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4232 yaffs_ChunkCache *cache;
4233 yaffs_Object *theObj;
4238 if (dev->param.nShortOpCaches > 0) {
4239 /* Try find a non-dirty one... */
4241 cache = yaffs_GrabChunkCacheWorker(dev);
4244 /* They were all dirty, find the last recently used object and flush
4245 * its cache, then find again.
4246 * NB what's here is not very accurate, we actually flush the object
4247 * the last recently used page.
4250 /* With locking we can't assume we can use entry zero */
4257 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4258 if (dev->srCache[i].object &&
4259 !dev->srCache[i].locked &&
4260 (dev->srCache[i].lastUse < usage || !cache)) {
4261 usage = dev->srCache[i].lastUse;
4262 theObj = dev->srCache[i].object;
4263 cache = &dev->srCache[i];
4268 if (!cache || cache->dirty) {
4269 /* Flush and try again */
4270 yaffs_FlushFilesChunkCache(theObj);
4271 cache = yaffs_GrabChunkCacheWorker(dev);
4281 /* Find a cached chunk */
4282 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4285 yaffs_Device *dev = obj->myDev;
4287 if (dev->param.nShortOpCaches > 0) {
4288 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4289 if (dev->srCache[i].object == obj &&
4290 dev->srCache[i].chunkId == chunkId) {
4293 return &dev->srCache[i];
4300 /* Mark the chunk for the least recently used algorithym */
4301 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4305 if (dev->param.nShortOpCaches > 0) {
4306 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4307 /* Reset the cache usages */
4309 for (i = 1; i < dev->param.nShortOpCaches; i++)
4310 dev->srCache[i].lastUse = 0;
4317 cache->lastUse = dev->srLastUse;
4324 /* Invalidate a single cache page.
4325 * Do this when a whole page gets written,
4326 * ie the short cache for this page is no longer valid.
4328 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4330 if (object->myDev->param.nShortOpCaches > 0) {
4331 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4334 cache->object = NULL;
4338 /* Invalidate all the cache pages associated with this object
4339 * Do this whenever ther file is deleted or resized.
4341 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4344 yaffs_Device *dev = in->myDev;
4346 if (dev->param.nShortOpCaches > 0) {
4347 /* Invalidate it. */
4348 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4349 if (dev->srCache[i].object == in)
4350 dev->srCache[i].object = NULL;
4355 /*--------------------- Checkpointing --------------------*/
4358 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4360 yaffs_CheckpointValidity cp;
4362 memset(&cp, 0, sizeof(cp));
4364 cp.structType = sizeof(cp);
4365 cp.magic = YAFFS_MAGIC;
4366 cp.version = YAFFS_CHECKPOINT_VERSION;
4367 cp.head = (head) ? 1 : 0;
4369 return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4373 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4375 yaffs_CheckpointValidity cp;
4378 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4381 ok = (cp.structType == sizeof(cp)) &&
4382 (cp.magic == YAFFS_MAGIC) &&
4383 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4384 (cp.head == ((head) ? 1 : 0));
4388 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4391 cp->nErasedBlocks = dev->nErasedBlocks;
4392 cp->allocationBlock = dev->allocationBlock;
4393 cp->allocationPage = dev->allocationPage;
4394 cp->nFreeChunks = dev->nFreeChunks;
4396 cp->nDeletedFiles = dev->nDeletedFiles;
4397 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4398 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4399 cp->sequenceNumber = dev->sequenceNumber;
4403 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4404 yaffs_CheckpointDevice *cp)
4406 dev->nErasedBlocks = cp->nErasedBlocks;
4407 dev->allocationBlock = cp->allocationBlock;
4408 dev->allocationPage = cp->allocationPage;
4409 dev->nFreeChunks = cp->nFreeChunks;
4411 dev->nDeletedFiles = cp->nDeletedFiles;
4412 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4413 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4414 dev->sequenceNumber = cp->sequenceNumber;
4418 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4420 yaffs_CheckpointDevice cp;
4422 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4426 /* Write device runtime values*/
4427 yaffs_DeviceToCheckpointDevice(&cp, dev);
4428 cp.structType = sizeof(cp);
4430 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4432 /* Write block info */
4434 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4435 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4438 /* Write chunk bits */
4440 nBytes = nBlocks * dev->chunkBitmapStride;
4441 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4447 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4449 yaffs_CheckpointDevice cp;
4451 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4455 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4459 if (cp.structType != sizeof(cp))
4463 yaffs_CheckpointDeviceToDevice(dev, &cp);
4465 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4467 ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4471 nBytes = nBlocks * dev->chunkBitmapStride;
4473 ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4478 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4482 cp->objectId = obj->objectId;
4483 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4484 cp->hdrChunk = obj->hdrChunk;
4485 cp->variantType = obj->variantType;
4486 cp->deleted = obj->deleted;
4487 cp->softDeleted = obj->softDeleted;
4488 cp->unlinked = obj->unlinked;
4489 cp->fake = obj->fake;
4490 cp->renameAllowed = obj->renameAllowed;
4491 cp->unlinkAllowed = obj->unlinkAllowed;
4492 cp->serial = obj->serial;
4493 cp->nDataChunks = obj->nDataChunks;
4495 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4496 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4497 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4498 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4501 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4504 yaffs_Object *parent;
4506 if (obj->variantType != cp->variantType) {
4507 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4508 TCONT("chunk %d does not match existing object type %d")
4509 TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4514 obj->objectId = cp->objectId;
4517 parent = yaffs_FindOrCreateObjectByNumber(
4520 YAFFS_OBJECT_TYPE_DIRECTORY);
4525 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4526 T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4527 TCONT(" chunk %d Parent type, %d, not directory")
4529 cp->objectId, cp->parentId, cp->variantType,
4530 cp->hdrChunk, parent->variantType));
4533 yaffs_AddObjectToDirectory(parent, obj);
4536 obj->hdrChunk = cp->hdrChunk;
4537 obj->variantType = cp->variantType;
4538 obj->deleted = cp->deleted;
4539 obj->softDeleted = cp->softDeleted;
4540 obj->unlinked = cp->unlinked;
4541 obj->fake = cp->fake;
4542 obj->renameAllowed = cp->renameAllowed;
4543 obj->unlinkAllowed = cp->unlinkAllowed;
4544 obj->serial = cp->serial;
4545 obj->nDataChunks = cp->nDataChunks;
4547 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4548 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4549 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4550 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4552 if (obj->hdrChunk > 0)
4553 obj->lazyLoaded = 1;
4559 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4560 __u32 level, int chunkOffset)
4563 yaffs_Device *dev = in->myDev;
4565 int tnodeSize = yaffs_CalcTnodeSize(dev);
4570 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4571 if (tn->internal[i]) {
4572 ok = yaffs_CheckpointTnodeWorker(in,
4575 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4578 } else if (level == 0) {
4579 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4580 ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4582 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4590 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4592 __u32 endMarker = ~0;
4595 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4596 ok = yaffs_CheckpointTnodeWorker(obj,
4597 obj->variant.fileVariant.top,
4598 obj->variant.fileVariant.topLevel,
4601 ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4608 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4612 yaffs_Device *dev = obj->myDev;
4613 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4616 int tnodeSize = yaffs_CalcTnodeSize(dev);
4618 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4620 while (ok && (~baseChunk)) {
4622 /* Read level 0 tnode */
4625 tn = yaffs_GetTnodeRaw(dev);
4627 ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4632 ok = yaffs_AddOrFindLevel0Tnode(dev,
4638 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4642 T(YAFFS_TRACE_CHECKPOINT, (
4643 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4644 nread, baseChunk, ok));
4650 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4653 yaffs_CheckpointObject cp;
4656 struct ylist_head *lh;
4659 /* Iterate through the objects in each hash entry,
4660 * dumping them to the checkpointing stream.
4663 for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
4664 ylist_for_each(lh, &dev->objectBucket[i].list) {
4666 obj = ylist_entry(lh, yaffs_Object, hashLink);
4667 if (!obj->deferedFree) {
4668 yaffs_ObjectToCheckpointObject(&cp, obj);
4669 cp.structType = sizeof(cp);
4671 T(YAFFS_TRACE_CHECKPOINT, (
4672 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4673 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4675 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4677 if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4678 ok = yaffs_WriteCheckpointTnodes(obj);
4684 /* Dump end of list */
4685 memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4686 cp.structType = sizeof(cp);
4689 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4694 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4697 yaffs_CheckpointObject cp;
4700 yaffs_Object *hardList = NULL;
4702 while (ok && !done) {
4703 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4704 if (cp.structType != sizeof(cp)) {
4705 T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4706 cp.structType, (int)sizeof(cp), ok));
4710 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4711 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4713 if (ok && cp.objectId == ~0)
4716 obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4718 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4721 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4722 ok = yaffs_ReadCheckpointTnodes(obj);
4723 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4724 obj->hardLinks.next =
4725 (struct ylist_head *) hardList;
4734 yaffs_HardlinkFixup(dev, hardList);
4739 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4741 __u32 checkpointSum;
4744 yaffs_GetCheckpointSum(dev, &checkpointSum);
4746 ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4754 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4756 __u32 checkpointSum0;
4757 __u32 checkpointSum1;
4760 yaffs_GetCheckpointSum(dev, &checkpointSum0);
4762 ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4767 if (checkpointSum0 != checkpointSum1)
4774 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4778 if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
4779 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4784 ok = yaffs_CheckpointOpen(dev, 1);
4787 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4788 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4791 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4792 ok = yaffs_WriteCheckpointDevice(dev);
4795 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4796 ok = yaffs_WriteCheckpointObjects(dev);
4799 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4800 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4804 ok = yaffs_WriteCheckpointSum(dev);
4806 if (!yaffs_CheckpointClose(dev))
4810 dev->isCheckpointed = 1;
4812 dev->isCheckpointed = 0;
4814 return dev->isCheckpointed;
4817 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4821 if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) {
4822 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4827 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4830 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4831 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4834 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4835 ok = yaffs_ReadCheckpointDevice(dev);
4838 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4839 ok = yaffs_ReadCheckpointObjects(dev);
4842 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4843 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4847 ok = yaffs_ReadCheckpointSum(dev);
4848 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4851 if (!yaffs_CheckpointClose(dev))
4855 dev->isCheckpointed = 1;
4857 dev->isCheckpointed = 0;
4863 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4865 if (dev->isCheckpointed ||
4866 dev->blocksInCheckpoint > 0) {
4867 dev->isCheckpointed = 0;
4868 yaffs_CheckpointInvalidateStream(dev);
4870 if (dev->param.markSuperBlockDirty)
4871 dev->param.markSuperBlockDirty(dev);
4875 int yaffs_CheckpointSave(yaffs_Device *dev)
4878 T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4880 yaffs_VerifyObjects(dev);
4881 yaffs_VerifyBlocks(dev);
4882 yaffs_VerifyFreeChunks(dev);
4884 if (!dev->isCheckpointed) {
4885 yaffs_InvalidateCheckpoint(dev);
4886 yaffs_WriteCheckpointData(dev);
4889 T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4891 return dev->isCheckpointed;
4894 int yaffs_CheckpointRestore(yaffs_Device *dev)
4897 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4899 retval = yaffs_ReadCheckpointData(dev);
4901 if (dev->isCheckpointed) {
4902 yaffs_VerifyObjects(dev);
4903 yaffs_VerifyBlocks(dev);
4904 yaffs_VerifyFreeChunks(dev);
4907 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4912 /*--------------------- File read/write ------------------------
4913 * Read and write have very similar structures.
4914 * In general the read/write has three parts to it
4915 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4916 * Some complete chunks
4917 * An incomplete chunk to end off with
4919 * Curve-balls: the first chunk might also be the last chunk.
4922 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4931 yaffs_ChunkCache *cache;
4938 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4939 /* start = offset % dev->nDataBytesPerChunk; */
4940 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4943 /* OK now check for the curveball where the start and end are in
4946 if ((start + n) < dev->nDataBytesPerChunk)
4949 nToCopy = dev->nDataBytesPerChunk - start;
4951 cache = yaffs_FindChunkCache(in, chunk);
4953 /* If the chunk is already in the cache or it is less than a whole chunk
4954 * or we're using inband tags then use the cache (if there is caching)
4955 * else bypass the cache.
4957 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
4958 if (dev->param.nShortOpCaches > 0) {
4960 /* If we can't find the data in the cache, then load it up. */
4963 cache = yaffs_GrabChunkCache(in->myDev);
4965 cache->chunkId = chunk;
4968 yaffs_ReadChunkDataFromObject(in, chunk,
4974 yaffs_UseChunkCache(dev, cache, 0);
4979 memcpy(buffer, &cache->data[start], nToCopy);
4983 /* Read into the local buffer then copy..*/
4986 yaffs_GetTempBuffer(dev, __LINE__);
4987 yaffs_ReadChunkDataFromObject(in, chunk,
4990 memcpy(buffer, &localBuffer[start], nToCopy);
4993 yaffs_ReleaseTempBuffer(dev, localBuffer,
4999 /* A full chunk. Read directly into the supplied buffer. */
5000 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
5014 int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5015 int nBytes, int writeThrough)
5024 int startOfWrite = offset;
5025 int chunkWritten = 0;
5033 while (n > 0 && chunkWritten >= 0) {
5034 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
5035 /* start = offset % dev->nDataBytesPerChunk; */
5036 yaffs_AddrToChunk(dev, offset, &chunk, &start);
5038 if (chunk * dev->nDataBytesPerChunk + start != offset ||
5039 start >= dev->nDataBytesPerChunk) {
5040 T(YAFFS_TRACE_ERROR, (
5041 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
5043 (int)offset, chunk, start));
5047 /* OK now check for the curveball where the start and end are in
5051 if ((start + n) < dev->nDataBytesPerChunk) {
5054 /* Now folks, to calculate how many bytes to write back....
5055 * If we're overwriting and not writing to then end of file then
5056 * we need to write back as much as was there before.
5059 chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
5061 if (chunkStart > in->variant.fileVariant.fileSize)
5062 nBytesRead = 0; /* Past end of file */
5064 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
5066 if (nBytesRead > dev->nDataBytesPerChunk)
5067 nBytesRead = dev->nDataBytesPerChunk;
5071 (start + n)) ? nBytesRead : (start + n);
5073 if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
5077 nToCopy = dev->nDataBytesPerChunk - start;
5078 nToWriteBack = dev->nDataBytesPerChunk;
5081 if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5082 /* An incomplete start or end chunk (or maybe both start and end chunk),
5083 * or we're using inband tags, so we want to use the cache buffers.
5085 if (dev->param.nShortOpCaches > 0) {
5086 yaffs_ChunkCache *cache;
5087 /* If we can't find the data in the cache, then load the cache */
5088 cache = yaffs_FindChunkCache(in, chunk);
5091 && yaffs_CheckSpaceForAllocation(dev, 1)) {
5092 cache = yaffs_GrabChunkCache(dev);
5094 cache->chunkId = chunk;
5097 yaffs_ReadChunkDataFromObject(in, chunk,
5101 !yaffs_CheckSpaceForAllocation(dev, 1)) {
5102 /* Drop the cache if it was a read cache item and
5103 * no space check has been made for it.
5109 yaffs_UseChunkCache(dev, cache, 1);
5113 memcpy(&cache->data[start], buffer,
5118 cache->nBytes = nToWriteBack;
5122 yaffs_WriteChunkDataToObject
5125 cache->data, cache->nBytes,
5131 chunkWritten = -1; /* fail the write */
5134 /* An incomplete start or end chunk (or maybe both start and end chunk)
5135 * Read into the local buffer then copy, then copy over and write back.
5139 yaffs_GetTempBuffer(dev, __LINE__);
5141 yaffs_ReadChunkDataFromObject(in, chunk,
5146 memcpy(&localBuffer[start], buffer, nToCopy);
5149 yaffs_WriteChunkDataToObject(in, chunk,
5154 yaffs_ReleaseTempBuffer(dev, localBuffer,
5160 /* A full chunk. Write directly from the supplied buffer. */
5165 yaffs_WriteChunkDataToObject(in, chunk, buffer,
5166 dev->nDataBytesPerChunk,
5169 /* Since we've overwritten the cached data, we better invalidate it. */
5170 yaffs_InvalidateChunkCache(in, chunk);
5173 if (chunkWritten >= 0) {
5182 /* Update file object */
5184 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5185 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5192 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5193 int nBytes, int writeThrough)
5195 yaffs_HandleHole(in,offset);
5196 return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
5201 /* ---------------------- File resizing stuff ------------------ */
5203 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5206 yaffs_Device *dev = in->myDev;
5207 int oldFileSize = in->variant.fileVariant.fileSize;
5209 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5211 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5212 dev->nDataBytesPerChunk;
5216 /* Delete backwards so that we don't end up with holes if
5217 * power is lost part-way through the operation.
5219 for (i = lastDel; i >= startDel; i--) {
5220 /* NB this could be optimised somewhat,
5221 * eg. could retrieve the tags and write them without
5222 * using yaffs_DeleteChunk
5225 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5228 (dev->internalStartBlock * dev->param.nChunksPerBlock)
5230 ((dev->internalEndBlock +
5231 1) * dev->param.nChunksPerBlock)) {
5232 T(YAFFS_TRACE_ALWAYS,
5233 (TSTR("Found daft chunkId %d for %d" TENDSTR),
5237 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5245 static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
5248 __u32 newSizeOfPartialChunk;
5249 yaffs_Device *dev = obj->myDev;
5251 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5253 yaffs_PruneResizedChunks(obj, newSize);
5255 if (newSizeOfPartialChunk != 0) {
5256 int lastChunk = 1 + newFullChunks;
5257 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5259 /* Got to read and rewrite the last chunk with its new size and zero pad */
5260 yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
5261 memset(localBuffer + newSizeOfPartialChunk, 0,
5262 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5264 yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
5265 newSizeOfPartialChunk, 1);
5267 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5270 obj->variant.fileVariant.fileSize = newSize;
5272 yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
5276 static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize)
5278 /* if newsSize > oldFileSize.
5279 * We're going to be writing a hole.
5280 * If the hole is small then write zeros otherwise write a start of hole marker.
5287 int result = YAFFS_OK;
5288 yaffs_Device *dev = NULL;
5290 __u8 *localBuffer = NULL;
5292 int smallIncreaseOk = 0;
5297 if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
5302 /* Bail out if not yaffs2 mode */
5303 if(!dev->param.isYaffs2)
5306 oldFileSize = obj->variant.fileVariant.fileSize;
5308 if (newSize <= oldFileSize)
5311 increase = newSize - oldFileSize;
5313 if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
5314 yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
5320 localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
5323 /* fill hole with zero bytes */
5324 int pos = oldFileSize;
5327 memset(localBuffer,0,dev->nDataBytesPerChunk);
5328 smallIncreaseOk = 1;
5330 while(increase > 0 && smallIncreaseOk){
5331 thisWrite = increase;
5332 if(thisWrite > dev->nDataBytesPerChunk)
5333 thisWrite = dev->nDataBytesPerChunk;
5334 written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
5335 if(written == thisWrite){
5337 increase -= thisWrite;
5339 smallIncreaseOk = 0;
5342 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
5344 /* If we were out of space then reverse any chunks we've added */
5345 if(!smallIncreaseOk)
5346 yaffs_ResizeDown(obj, oldFileSize);
5349 if (!smallIncreaseOk &&
5351 obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5352 obj->parent->objectId != YAFFS_OBJECTID_DELETED){
5353 /* Write a hole start header with the old file size */
5354 yaffs_UpdateObjectHeader(obj, NULL, 0,1,0);
5361 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5363 yaffs_Device *dev = in->myDev;
5364 int oldFileSize = in->variant.fileVariant.fileSize;
5366 yaffs_FlushFilesChunkCache(in);
5367 yaffs_InvalidateWholeChunkCache(in);
5369 yaffs_CheckGarbageCollection(dev);
5371 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5374 if (newSize == oldFileSize)
5377 if(newSize > oldFileSize){
5378 yaffs_HandleHole(in,newSize);
5379 in->variant.fileVariant.fileSize = newSize;
5381 /* newSize < oldFileSize */
5382 yaffs_ResizeDown(in, newSize);
5385 /* Write a new object header to reflect the resize.
5386 * show we've shrunk the file, if need be
5387 * Do this only if the file is not in the deleted directories
5388 * and is not shadowed.
5392 in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5393 in->parent->objectId != YAFFS_OBJECTID_DELETED)
5394 yaffs_UpdateObjectHeader(in, NULL, 0,0,0);
5400 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5402 YCHAR *alias = NULL;
5403 obj = yaffs_GetEquivalentObject(obj);
5405 switch (obj->variantType) {
5406 case YAFFS_OBJECT_TYPE_FILE:
5407 return obj->variant.fileVariant.fileSize;
5408 case YAFFS_OBJECT_TYPE_SYMLINK:
5409 alias = obj->variant.symLinkVariant.alias;
5412 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5420 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5424 yaffs_FlushFilesChunkCache(in);
5425 if(dataSync) /* Only sync data */
5429 #ifdef CONFIG_YAFFS_WINCE
5430 yfsd_WinFileTimeNow(in->win_mtime);
5433 in->yst_mtime = Y_CURRENT_TIME;
5438 retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5439 0) ? YAFFS_OK : YAFFS_FAIL;
5449 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5452 /* First off, invalidate the file's data in the cache, without flushing. */
5453 yaffs_InvalidateWholeChunkCache(in);
5455 if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5456 /* Move to the unlinked directory so we have a record that it was deleted. */
5457 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5461 yaffs_RemoveObjectFromDirectory(in);
5462 yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5465 yaffs_FreeObject(in);
5470 /* yaffs_DeleteFile deletes the whole file data
5471 * and the inode associated with the file.
5472 * It does not delete the links associated with the file.
5474 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5478 int immediateDeletion = 0;
5481 immediateDeletion = 1;
5483 if (immediateDeletion) {
5485 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5486 _Y("deleted"), 0, 0);
5487 T(YAFFS_TRACE_TRACING,
5488 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5491 in->myDev->nDeletedFiles++;
5492 if (1 || in->myDev->param.isYaffs2)
5493 yaffs_ResizeFile(in, 0);
5494 yaffs_SoftDeleteFile(in);
5497 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5498 _Y("unlinked"), 0, 0);
5505 int yaffs_DeleteFile(yaffs_Object *in)
5507 int retVal = YAFFS_OK;
5508 int deleted = in->deleted;
5510 yaffs_ResizeFile(in, 0);
5512 if (in->nDataChunks > 0) {
5513 /* Use soft deletion if there is data in the file.
5514 * That won't be the case if it has been resized to zero.
5517 retVal = yaffs_UnlinkFileIfNeeded(in);
5519 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5522 in->myDev->nDeletedFiles++;
5523 yaffs_SoftDeleteFile(in);
5525 return deleted ? YAFFS_OK : YAFFS_FAIL;
5527 /* The file has no data chunks so we toss it immediately */
5528 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5529 in->variant.fileVariant.top = NULL;
5530 yaffs_DoGenericObjectDeletion(in);
5536 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5538 return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5539 !(ylist_empty(&obj->variant.directoryVariant.children));
5542 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5544 /* First check that the directory is empty. */
5545 if (yaffs_IsNonEmptyDirectory(obj))
5548 return yaffs_DoGenericObjectDeletion(obj);
5551 static int yaffs_DeleteSymLink(yaffs_Object *in)
5553 if(in->variant.symLinkVariant.alias)
5554 YFREE(in->variant.symLinkVariant.alias);
5555 in->variant.symLinkVariant.alias=NULL;
5557 return yaffs_DoGenericObjectDeletion(in);
5560 static int yaffs_DeleteHardLink(yaffs_Object *in)
5562 /* remove this hardlink from the list assocaited with the equivalent
5565 ylist_del_init(&in->hardLinks);
5566 return yaffs_DoGenericObjectDeletion(in);
5569 int yaffs_DeleteObject(yaffs_Object *obj)
5572 switch (obj->variantType) {
5573 case YAFFS_OBJECT_TYPE_FILE:
5574 retVal = yaffs_DeleteFile(obj);
5576 case YAFFS_OBJECT_TYPE_DIRECTORY:
5577 if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
5578 T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
5579 ylist_del_init(&obj->variant.directoryVariant.dirty);
5581 return yaffs_DeleteDirectory(obj);
5583 case YAFFS_OBJECT_TYPE_SYMLINK:
5584 retVal = yaffs_DeleteSymLink(obj);
5586 case YAFFS_OBJECT_TYPE_HARDLINK:
5587 retVal = yaffs_DeleteHardLink(obj);
5589 case YAFFS_OBJECT_TYPE_SPECIAL:
5590 retVal = yaffs_DoGenericObjectDeletion(obj);
5592 case YAFFS_OBJECT_TYPE_UNKNOWN:
5594 break; /* should not happen. */
5600 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5603 int immediateDeletion = 0;
5606 immediateDeletion = 1;
5609 yaffs_UpdateParent(obj->parent);
5611 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5612 return yaffs_DeleteHardLink(obj);
5613 } else if (!ylist_empty(&obj->hardLinks)) {
5614 /* Curve ball: We're unlinking an object that has a hardlink.
5616 * This problem arises because we are not strictly following
5617 * The Linux link/inode model.
5619 * We can't really delete the object.
5620 * Instead, we do the following:
5621 * - Select a hardlink.
5622 * - Unhook it from the hard links
5623 * - Move it from its parent directory (so that the rename can work)
5624 * - Rename the object to the hardlink's name.
5625 * - Delete the hardlink
5629 yaffs_Object *parent;
5631 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5633 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5635 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5636 parent = hl->parent;
5638 ylist_del_init(&hl->hardLinks);
5640 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5642 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5644 if (retVal == YAFFS_OK)
5645 retVal = yaffs_DoGenericObjectDeletion(hl);
5649 } else if (immediateDeletion) {
5650 switch (obj->variantType) {
5651 case YAFFS_OBJECT_TYPE_FILE:
5652 return yaffs_DeleteFile(obj);
5654 case YAFFS_OBJECT_TYPE_DIRECTORY:
5655 ylist_del_init(&obj->variant.directoryVariant.dirty);
5656 return yaffs_DeleteDirectory(obj);
5658 case YAFFS_OBJECT_TYPE_SYMLINK:
5659 return yaffs_DeleteSymLink(obj);
5661 case YAFFS_OBJECT_TYPE_SPECIAL:
5662 return yaffs_DoGenericObjectDeletion(obj);
5664 case YAFFS_OBJECT_TYPE_HARDLINK:
5665 case YAFFS_OBJECT_TYPE_UNKNOWN:
5669 } else if(yaffs_IsNonEmptyDirectory(obj))
5672 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5673 _Y("unlinked"), 0, 0);
5677 static int yaffs_UnlinkObject(yaffs_Object *obj)
5680 if (obj && obj->unlinkAllowed)
5681 return yaffs_UnlinkWorker(obj);
5686 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5690 obj = yaffs_FindObjectByName(dir, name);
5691 return yaffs_UnlinkObject(obj);
5694 /*----------------------- Initialisation Scanning ---------------------- */
5696 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5697 int backwardScanning)
5701 if (!backwardScanning) {
5702 /* Handle YAFFS1 forward scanning case
5703 * For YAFFS1 we always do the deletion
5707 /* Handle YAFFS2 case (backward scanning)
5708 * If the shadowed object exists then ignore.
5710 obj = yaffs_FindObjectByNumber(dev, objId);
5715 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5716 * We put it in unlinked dir to be cleaned up after the scanning
5719 yaffs_FindOrCreateObjectByNumber(dev, objId,
5720 YAFFS_OBJECT_TYPE_FILE);
5723 obj->isShadowed = 1;
5724 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5725 obj->variant.fileVariant.shrinkSize = 0;
5726 obj->valid = 1; /* So that we don't read any other info for this file */
5736 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5743 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5745 in = yaffs_FindObjectByNumber(dev,
5746 hl->variant.hardLinkVariant.
5747 equivalentObjectId);
5750 /* Add the hardlink pointers */
5751 hl->variant.hardLinkVariant.equivalentObject = in;
5752 ylist_add(&hl->hardLinks, &in->hardLinks);
5754 /* Todo Need to report/handle this better.
5755 * Got a problem... hardlink to a non-existant object
5757 hl->variant.hardLinkVariant.equivalentObject = NULL;
5758 YINIT_LIST_HEAD(&hl->hardLinks);
5768 static int ybicmp(const void *a, const void *b)
5770 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5771 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5772 register int ablock = ((yaffs_BlockIndex *)a)->block;
5773 register int bblock = ((yaffs_BlockIndex *)b)->block;
5775 return ablock - bblock;
5781 struct yaffs_ShadowFixerStruct {
5784 struct yaffs_ShadowFixerStruct *next;
5788 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5791 * Sort out state of unlinked and deleted objects after scanning.
5793 struct ylist_head *i;
5794 struct ylist_head *n;
5797 /* Soft delete all the unlinked files */
5798 ylist_for_each_safe(i, n,
5799 &dev->unlinkedDir->variant.directoryVariant.children) {
5801 l = ylist_entry(i, yaffs_Object, siblings);
5802 yaffs_DeleteObject(l);
5806 ylist_for_each_safe(i, n,
5807 &dev->deletedDir->variant.directoryVariant.children) {
5809 l = ylist_entry(i, yaffs_Object, siblings);
5810 yaffs_DeleteObject(l);
5817 * This code iterates through all the objects making sure that they are rooted.
5818 * Any unrooted objects are re-rooted in lost+found.
5819 * An object needs to be in one of:
5820 * - Directly under deleted, unlinked
5821 * - Directly or indirectly under root.
5824 * This code assumes that we don't ever change the current relationships between
5826 * rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5827 * lostNfound->parent == rootDir
5829 * This fixes the problem where directories might have inadvertently been deleted
5830 * leaving the object "hanging" without being rooted in the directory tree.
5833 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5835 return (obj == dev->deletedDir ||
5836 obj == dev->unlinkedDir||
5837 obj == dev->rootDir);
5840 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5843 yaffs_Object *parent;
5845 struct ylist_head *lh;
5846 struct ylist_head *n;
5851 /* Iterate through the objects in each hash entry,
5852 * looking at each object.
5853 * Make sure it is rooted.
5856 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
5857 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5859 obj = ylist_entry(lh, yaffs_Object, hashLink);
5860 parent= obj->parent;
5862 if(yaffs_HasNULLParent(dev,obj)){
5863 /* These directories are not hanging */
5866 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5868 else if(yaffs_HasNULLParent(dev,parent))
5872 * Need to follow the parent chain to see if it is hanging.
5877 while(parent != dev->rootDir &&
5879 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5881 parent = parent->parent;
5884 if(parent != dev->rootDir)
5889 (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5891 yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5900 * Delete directory contents for cleaning up lost and found.
5902 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
5905 struct ylist_head *lh;
5906 struct ylist_head *n;
5908 if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5911 ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
5913 obj = ylist_entry(lh, yaffs_Object, siblings);
5914 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
5915 yaffs_DeleteDirectoryContents(obj);
5918 (TSTR("Deleting lost_found object %d" TENDSTR),
5921 /* Need to use UnlinkObject since Delete would not handle
5922 * hardlinked objects correctly.
5924 yaffs_UnlinkObject(obj);
5930 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
5932 yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
5935 static int yaffs_Scan(yaffs_Device *dev)
5937 yaffs_ExtendedTags tags;
5947 yaffs_BlockState state;
5948 yaffs_Object *hardList = NULL;
5949 yaffs_BlockInfo *bi;
5950 __u32 sequenceNumber;
5951 yaffs_ObjectHeader *oh;
5953 yaffs_Object *parent;
5955 int alloc_failed = 0;
5957 struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5965 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5966 dev->internalStartBlock, dev->internalEndBlock));
5968 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5970 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5972 /* Scan all the blocks to determine their state */
5973 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5974 bi = yaffs_GetBlockInfo(dev, blk);
5975 yaffs_ClearChunkBits(dev, blk);
5977 bi->softDeletions = 0;
5979 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5981 bi->blockState = state;
5982 bi->sequenceNumber = sequenceNumber;
5984 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5985 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5987 T(YAFFS_TRACE_SCAN_DEBUG,
5988 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5989 state, sequenceNumber));
5991 if (state == YAFFS_BLOCK_STATE_DEAD) {
5992 T(YAFFS_TRACE_BAD_BLOCKS,
5993 (TSTR("block %d is bad" TENDSTR), blk));
5994 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5995 T(YAFFS_TRACE_SCAN_DEBUG,
5996 (TSTR("Block empty " TENDSTR)));
5997 dev->nErasedBlocks++;
5998 dev->nFreeChunks += dev->param.nChunksPerBlock;
6002 startIterator = dev->internalStartBlock;
6003 endIterator = dev->internalEndBlock;
6005 /* For each block.... */
6006 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
6013 blk = blockIterator;
6015 bi = yaffs_GetBlockInfo(dev, blk);
6016 state = bi->blockState;
6020 /* For each chunk in each block that needs scanning....*/
6021 for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
6022 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
6023 /* Read the tags and decide what to do */
6024 chunk = blk * dev->param.nChunksPerBlock + c;
6026 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6029 /* Let's have a good look at this chunk... */
6031 if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
6037 /*T((" %d %d deleted\n",blk,c)); */
6038 } else if (!tags.chunkUsed) {
6039 /* An unassigned chunk in the block
6040 * This means that either the block is empty or
6041 * this is the one being allocated from
6045 /* We're looking at the first chunk in the block so the block is unused */
6046 state = YAFFS_BLOCK_STATE_EMPTY;
6047 dev->nErasedBlocks++;
6049 /* this is the block being allocated from */
6052 (" Allocating from %d %d" TENDSTR),
6054 state = YAFFS_BLOCK_STATE_ALLOCATING;
6055 dev->allocationBlock = blk;
6056 dev->allocationPage = c;
6057 dev->allocationBlockFinder = blk;
6058 /* Set block finder here to encourage the allocator to go forth from here. */
6062 dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
6063 } else if (tags.chunkId > 0) {
6064 /* chunkId > 0 so it is a data chunk... */
6065 unsigned int endpos;
6067 yaffs_SetChunkBit(dev, blk, c);
6070 in = yaffs_FindOrCreateObjectByNumber(dev,
6073 YAFFS_OBJECT_TYPE_FILE);
6074 /* PutChunkIntoFile checks for a clash (two data chunks with
6075 * the same chunkId).
6082 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
6087 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
6090 in->variantType == YAFFS_OBJECT_TYPE_FILE
6091 && in->variant.fileVariant.scannedFileSize <
6093 in->variant.fileVariant.
6094 scannedFileSize = endpos;
6095 if (!dev->param.useHeaderFileSize) {
6096 in->variant.fileVariant.
6098 in->variant.fileVariant.
6103 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
6105 /* chunkId == 0, so it is an ObjectHeader.
6106 * Thus, we read in the object header and make the object
6108 yaffs_SetChunkBit(dev, blk, c);
6111 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
6115 oh = (yaffs_ObjectHeader *) chunkData;
6117 in = yaffs_FindObjectByNumber(dev,
6119 if (in && in->variantType != oh->type) {
6120 /* This should not happen, but somehow
6121 * Wev'e ended up with an objectId that has been reused but not yet
6122 * deleted, and worse still it has changed type. Delete the old object.
6125 yaffs_DeleteObject(in);
6130 in = yaffs_FindOrCreateObjectByNumber(dev,
6138 if (in && oh->shadowsObject > 0) {
6140 struct yaffs_ShadowFixerStruct *fixer;
6141 fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
6143 fixer->next = shadowFixerList;
6144 shadowFixerList = fixer;
6145 fixer->objectId = tags.objectId;
6146 fixer->shadowedId = oh->shadowsObject;
6151 if (in && in->valid) {
6152 /* We have already filled this one. We have a duplicate and need to resolve it. */
6154 unsigned existingSerial = in->serial;
6155 unsigned newSerial = tags.serialNumber;
6157 if (((existingSerial + 1) & 3) == newSerial) {
6158 /* Use new one - destroy the exisiting one */
6159 yaffs_DeleteChunk(dev,
6164 /* Use existing - destroy this one. */
6165 yaffs_DeleteChunk(dev, chunk, 1,
6170 if (in && !in->valid &&
6171 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6172 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
6173 /* We only load some info, don't fiddle with directory structure */
6175 in->variantType = oh->type;
6177 in->yst_mode = oh->yst_mode;
6178 #ifdef CONFIG_YAFFS_WINCE
6179 in->win_atime[0] = oh->win_atime[0];
6180 in->win_ctime[0] = oh->win_ctime[0];
6181 in->win_mtime[0] = oh->win_mtime[0];
6182 in->win_atime[1] = oh->win_atime[1];
6183 in->win_ctime[1] = oh->win_ctime[1];
6184 in->win_mtime[1] = oh->win_mtime[1];
6186 in->yst_uid = oh->yst_uid;
6187 in->yst_gid = oh->yst_gid;
6188 in->yst_atime = oh->yst_atime;
6189 in->yst_mtime = oh->yst_mtime;
6190 in->yst_ctime = oh->yst_ctime;
6191 in->yst_rdev = oh->yst_rdev;
6193 in->hdrChunk = chunk;
6194 in->serial = tags.serialNumber;
6196 } else if (in && !in->valid) {
6197 /* we need to load this info */
6200 in->variantType = oh->type;
6202 in->yst_mode = oh->yst_mode;
6203 #ifdef CONFIG_YAFFS_WINCE
6204 in->win_atime[0] = oh->win_atime[0];
6205 in->win_ctime[0] = oh->win_ctime[0];
6206 in->win_mtime[0] = oh->win_mtime[0];
6207 in->win_atime[1] = oh->win_atime[1];
6208 in->win_ctime[1] = oh->win_ctime[1];
6209 in->win_mtime[1] = oh->win_mtime[1];
6211 in->yst_uid = oh->yst_uid;
6212 in->yst_gid = oh->yst_gid;
6213 in->yst_atime = oh->yst_atime;
6214 in->yst_mtime = oh->yst_mtime;
6215 in->yst_ctime = oh->yst_ctime;
6216 in->yst_rdev = oh->yst_rdev;
6218 in->hdrChunk = chunk;
6219 in->serial = tags.serialNumber;
6221 yaffs_SetObjectName(in, oh->name);
6224 /* directory stuff...
6229 yaffs_FindOrCreateObjectByNumber
6230 (dev, oh->parentObjectId,
6231 YAFFS_OBJECT_TYPE_DIRECTORY);
6234 if (parent && parent->variantType ==
6235 YAFFS_OBJECT_TYPE_UNKNOWN) {
6236 /* Set up as a directory */
6237 parent->variantType =
6238 YAFFS_OBJECT_TYPE_DIRECTORY;
6239 YINIT_LIST_HEAD(&parent->variant.
6242 } else if (!parent || parent->variantType !=
6243 YAFFS_OBJECT_TYPE_DIRECTORY) {
6244 /* Hoosterman, another problem....
6245 * We're trying to use a non-directory as a directory
6248 T(YAFFS_TRACE_ERROR,
6250 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6252 parent = dev->lostNFoundDir;
6255 yaffs_AddObjectToDirectory(parent, in);
6257 if (0 && (parent == dev->deletedDir ||
6258 parent == dev->unlinkedDir)) {
6259 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
6260 dev->nDeletedFiles++;
6262 /* Note re hardlinks.
6263 * Since we might scan a hardlink before its equivalent object is scanned
6264 * we put them all in a list.
6265 * After scanning is complete, we should have all the objects, so we run through this
6266 * list and fix up all the chains.
6269 switch (in->variantType) {
6270 case YAFFS_OBJECT_TYPE_UNKNOWN:
6271 /* Todo got a problem */
6273 case YAFFS_OBJECT_TYPE_FILE:
6274 if (dev->param.useHeaderFileSize)
6276 in->variant.fileVariant.
6281 case YAFFS_OBJECT_TYPE_HARDLINK:
6282 in->variant.hardLinkVariant.
6283 equivalentObjectId =
6284 oh->equivalentObjectId;
6285 in->hardLinks.next =
6286 (struct ylist_head *)
6290 case YAFFS_OBJECT_TYPE_DIRECTORY:
6293 case YAFFS_OBJECT_TYPE_SPECIAL:
6296 case YAFFS_OBJECT_TYPE_SYMLINK:
6297 in->variant.symLinkVariant.alias =
6298 yaffs_CloneString(oh->alias);
6299 if (!in->variant.symLinkVariant.alias)
6308 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6309 /* If we got this far while scanning, then the block is fully allocated.*/
6310 state = YAFFS_BLOCK_STATE_FULL;
6313 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6314 /* If the block was partially allocated then treat it as fully allocated.*/
6315 state = YAFFS_BLOCK_STATE_FULL;
6316 dev->allocationBlock = -1;
6319 bi->blockState = state;
6321 /* Now let's see if it was dirty */
6322 if (bi->pagesInUse == 0 &&
6323 !bi->hasShrinkHeader &&
6324 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6325 yaffs_BlockBecameDirty(dev, blk);
6331 /* Ok, we've done all the scanning.
6332 * Fix up the hard link chains.
6333 * We should now have scanned all the objects, now it's time to add these
6337 yaffs_HardlinkFixup(dev, hardList);
6339 /* Fix up any shadowed objects */
6341 struct yaffs_ShadowFixerStruct *fixer;
6344 while (shadowFixerList) {
6345 fixer = shadowFixerList;
6346 shadowFixerList = fixer->next;
6347 /* Complete the rename transaction by deleting the shadowed object
6348 * then setting the object header to unshadowed.
6350 obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6352 yaffs_DeleteObject(obj);
6354 obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6357 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6363 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6368 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6374 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6377 yaffs_ObjectHeader *oh;
6379 yaffs_ExtendedTags tags;
6381 int alloc_failed = 0;
6389 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6391 in->lazyLoaded ? "not yet" : "already"));
6394 if (in->lazyLoaded && in->hdrChunk > 0) {
6396 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6398 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6399 oh = (yaffs_ObjectHeader *) chunkData;
6401 in->yst_mode = oh->yst_mode;
6402 #ifdef CONFIG_YAFFS_WINCE
6403 in->win_atime[0] = oh->win_atime[0];
6404 in->win_ctime[0] = oh->win_ctime[0];
6405 in->win_mtime[0] = oh->win_mtime[0];
6406 in->win_atime[1] = oh->win_atime[1];
6407 in->win_ctime[1] = oh->win_ctime[1];
6408 in->win_mtime[1] = oh->win_mtime[1];
6410 in->yst_uid = oh->yst_uid;
6411 in->yst_gid = oh->yst_gid;
6412 in->yst_atime = oh->yst_atime;
6413 in->yst_mtime = oh->yst_mtime;
6414 in->yst_ctime = oh->yst_ctime;
6415 in->yst_rdev = oh->yst_rdev;
6418 yaffs_SetObjectName(in, oh->name);
6420 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6421 in->variant.symLinkVariant.alias =
6422 yaffs_CloneString(oh->alias);
6423 if (!in->variant.symLinkVariant.alias)
6424 alloc_failed = 1; /* Not returned to caller */
6427 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6431 static int yaffs_ScanBackwards(yaffs_Device *dev)
6433 yaffs_ExtendedTags tags;
6438 int nBlocksToScan = 0;
6444 yaffs_BlockState state;
6445 yaffs_Object *hardList = NULL;
6446 yaffs_BlockInfo *bi;
6447 __u32 sequenceNumber;
6448 yaffs_ObjectHeader *oh;
6450 yaffs_Object *parent;
6451 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6457 int foundChunksInBlock;
6458 int equivalentObjectId;
6459 int alloc_failed = 0;
6462 yaffs_BlockIndex *blockIndex = NULL;
6463 int altBlockIndex = 0;
6465 if (!dev->param.isYaffs2) {
6467 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6473 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
6474 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6477 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6479 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6482 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6488 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6492 dev->blocksInCheckpoint = 0;
6494 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6496 /* Scan all the blocks to determine their state */
6497 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6498 bi = yaffs_GetBlockInfo(dev, blk);
6499 yaffs_ClearChunkBits(dev, blk);
6501 bi->softDeletions = 0;
6503 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6505 bi->blockState = state;
6506 bi->sequenceNumber = sequenceNumber;
6508 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6509 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6510 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6511 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6513 T(YAFFS_TRACE_SCAN_DEBUG,
6514 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6515 state, sequenceNumber));
6518 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6519 dev->blocksInCheckpoint++;
6521 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6522 T(YAFFS_TRACE_BAD_BLOCKS,
6523 (TSTR("block %d is bad" TENDSTR), blk));
6524 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6525 T(YAFFS_TRACE_SCAN_DEBUG,
6526 (TSTR("Block empty " TENDSTR)));
6527 dev->nErasedBlocks++;
6528 dev->nFreeChunks += dev->param.nChunksPerBlock;
6529 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6531 /* Determine the highest sequence number */
6532 if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6533 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6535 blockIndex[nBlocksToScan].seq = sequenceNumber;
6536 blockIndex[nBlocksToScan].block = blk;
6540 if (sequenceNumber >= dev->sequenceNumber)
6541 dev->sequenceNumber = sequenceNumber;
6543 /* TODO: Nasty sequence number! */
6546 ("Block scanning block %d has bad sequence number %d"
6547 TENDSTR), blk, sequenceNumber));
6554 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6560 /* Sort the blocks */
6561 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6563 /* Use qsort now. */
6564 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6568 /* Dungy old bubble sort... */
6570 yaffs_BlockIndex temp;
6574 for (i = 0; i < nBlocksToScan; i++)
6575 for (j = i + 1; j < nBlocksToScan; j++)
6576 if (blockIndex[i].seq > blockIndex[j].seq) {
6577 temp = blockIndex[j];
6578 blockIndex[j] = blockIndex[i];
6579 blockIndex[i] = temp;
6586 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6588 /* Now scan the blocks looking at the data. */
6590 endIterator = nBlocksToScan - 1;
6591 T(YAFFS_TRACE_SCAN_DEBUG,
6592 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6594 /* For each block.... backwards */
6595 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6597 /* Cooperative multitasking! This loop can run for so
6598 long that watchdog timers expire. */
6601 /* get the block to scan in the correct order */
6602 blk = blockIndex[blockIterator].block;
6604 bi = yaffs_GetBlockInfo(dev, blk);
6607 state = bi->blockState;
6611 /* For each chunk in each block that needs scanning.... */
6612 foundChunksInBlock = 0;
6613 for (c = dev->param.nChunksPerBlock - 1;
6614 !alloc_failed && c >= 0 &&
6615 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6616 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6617 /* Scan backwards...
6618 * Read the tags and decide what to do
6621 chunk = blk * dev->param.nChunksPerBlock + c;
6623 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6626 /* Let's have a good look at this chunk... */
6628 if (!tags.chunkUsed) {
6629 /* An unassigned chunk in the block.
6630 * If there are used chunks after this one, then
6631 * it is a chunk that was skipped due to failing the erased
6632 * check. Just skip it so that it can be deleted.
6633 * But, more typically, We get here when this is an unallocated
6634 * chunk and his means that either the block is empty or
6635 * this is the one being allocated from
6638 if (foundChunksInBlock) {
6639 /* This is a chunk that was skipped due to failing the erased check */
6640 } else if (c == 0) {
6641 /* We're looking at the first chunk in the block so the block is unused */
6642 state = YAFFS_BLOCK_STATE_EMPTY;
6643 dev->nErasedBlocks++;
6645 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6646 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6647 if (dev->sequenceNumber == bi->sequenceNumber) {
6648 /* this is the block being allocated from */
6652 (" Allocating from %d %d"
6655 state = YAFFS_BLOCK_STATE_ALLOCATING;
6656 dev->allocationBlock = blk;
6657 dev->allocationPage = c;
6658 dev->allocationBlockFinder = blk;
6660 /* This is a partially written block that is not
6661 * the current allocation block.
6664 T(YAFFS_TRACE_ALWAYS,
6665 (TSTR("Partially written block %d detected" TENDSTR),
6673 } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6675 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6680 } else if (tags.chunkId > 0) {
6681 /* chunkId > 0 so it is a data chunk... */
6682 unsigned int endpos;
6684 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6686 foundChunksInBlock = 1;
6689 yaffs_SetChunkBit(dev, blk, c);
6692 in = yaffs_FindOrCreateObjectByNumber(dev,
6695 YAFFS_OBJECT_TYPE_FILE);
6702 in->variantType == YAFFS_OBJECT_TYPE_FILE
6703 && chunkBase < in->variant.fileVariant.shrinkSize) {
6704 /* This has not been invalidated by a resize */
6705 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
6709 /* File size is calculated by looking at the data chunks if we have not
6710 * seen an object header yet. Stop this practice once we find an object header.
6712 endpos = chunkBase + tags.byteCount;
6714 if (!in->valid && /* have not got an object header yet */
6715 in->variant.fileVariant.scannedFileSize < endpos) {
6716 in->variant.fileVariant.scannedFileSize = endpos;
6717 in->variant.fileVariant.fileSize = endpos;
6721 /* This chunk has been invalidated by a resize, or a past file deletion
6722 * so delete the chunk*/
6723 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6727 /* chunkId == 0, so it is an ObjectHeader.
6728 * Thus, we read in the object header and make the object
6730 foundChunksInBlock = 1;
6732 yaffs_SetChunkBit(dev, blk, c);
6738 if (tags.extraHeaderInfoAvailable) {
6739 in = yaffs_FindOrCreateObjectByNumber(dev,
6741 tags.extraObjectType);
6747 (!in->valid && dev->param.disableLazyLoad) ||
6748 tags.extraShadows ||
6750 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6751 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6753 /* If we don't have valid info then we need to read the chunk
6754 * TODO In future we can probably defer reading the chunk and
6755 * living with invalid data until needed.
6758 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6763 oh = (yaffs_ObjectHeader *) chunkData;
6765 if (dev->param.inbandTags) {
6766 /* Fix up the header if they got corrupted by inband tags */
6767 oh->shadowsObject = oh->inbandShadowsObject;
6768 oh->isShrink = oh->inbandIsShrink;
6772 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6780 /* TODO Hoosterman we have a problem! */
6781 T(YAFFS_TRACE_ERROR,
6783 ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
6784 TENDSTR), tags.objectId, chunk));
6789 /* We have already filled this one.
6790 * We have a duplicate that will be discarded, but
6791 * we first have to suck out resize info if it is a file.
6794 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6796 oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6797 (tags.extraHeaderInfoAvailable &&
6798 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6800 (oh) ? oh->fileSize : tags.
6802 __u32 parentObjectId =
6804 parentObjectId : tags.
6805 extraParentObjectId;
6809 (oh) ? oh->isShrink : tags.
6810 extraIsShrinkHeader;
6812 /* If it is deleted (unlinked at start also means deleted)
6813 * we treat the file size as being zeroed at this point.
6815 if (parentObjectId ==
6816 YAFFS_OBJECTID_DELETED
6817 || parentObjectId ==
6818 YAFFS_OBJECTID_UNLINKED) {
6823 if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
6824 in->variant.fileVariant.shrinkSize = thisSize;
6827 bi->hasShrinkHeader = 1;
6830 /* Use existing - destroy this one. */
6831 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6835 if (!in->valid && in->variantType !=
6836 (oh ? oh->type : tags.extraObjectType))
6837 T(YAFFS_TRACE_ERROR, (
6838 TSTR("yaffs tragedy: Bad object type, "
6839 TCONT("%d != %d, for object %d at chunk ")
6840 TCONT("%d during scan")
6842 oh->type : tags.extraObjectType,
6843 in->variantType, tags.objectId,
6847 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6849 YAFFS_OBJECTID_LOSTNFOUND)) {
6850 /* We only load some info, don't fiddle with directory structure */
6854 in->variantType = oh->type;
6856 in->yst_mode = oh->yst_mode;
6857 #ifdef CONFIG_YAFFS_WINCE
6858 in->win_atime[0] = oh->win_atime[0];
6859 in->win_ctime[0] = oh->win_ctime[0];
6860 in->win_mtime[0] = oh->win_mtime[0];
6861 in->win_atime[1] = oh->win_atime[1];
6862 in->win_ctime[1] = oh->win_ctime[1];
6863 in->win_mtime[1] = oh->win_mtime[1];
6865 in->yst_uid = oh->yst_uid;
6866 in->yst_gid = oh->yst_gid;
6867 in->yst_atime = oh->yst_atime;
6868 in->yst_mtime = oh->yst_mtime;
6869 in->yst_ctime = oh->yst_ctime;
6870 in->yst_rdev = oh->yst_rdev;
6874 in->variantType = tags.extraObjectType;
6878 in->hdrChunk = chunk;
6880 } else if (!in->valid) {
6881 /* we need to load this info */
6884 in->hdrChunk = chunk;
6887 in->variantType = oh->type;
6889 in->yst_mode = oh->yst_mode;
6890 #ifdef CONFIG_YAFFS_WINCE
6891 in->win_atime[0] = oh->win_atime[0];
6892 in->win_ctime[0] = oh->win_ctime[0];
6893 in->win_mtime[0] = oh->win_mtime[0];
6894 in->win_atime[1] = oh->win_atime[1];
6895 in->win_ctime[1] = oh->win_ctime[1];
6896 in->win_mtime[1] = oh->win_mtime[1];
6898 in->yst_uid = oh->yst_uid;
6899 in->yst_gid = oh->yst_gid;
6900 in->yst_atime = oh->yst_atime;
6901 in->yst_mtime = oh->yst_mtime;
6902 in->yst_ctime = oh->yst_ctime;
6903 in->yst_rdev = oh->yst_rdev;
6906 if (oh->shadowsObject > 0)
6907 yaffs_HandleShadowedObject(dev,
6914 yaffs_SetObjectName(in, oh->name);
6916 yaffs_FindOrCreateObjectByNumber
6917 (dev, oh->parentObjectId,
6918 YAFFS_OBJECT_TYPE_DIRECTORY);
6920 fileSize = oh->fileSize;
6921 isShrink = oh->isShrink;
6922 equivalentObjectId = oh->equivalentObjectId;
6925 in->variantType = tags.extraObjectType;
6927 yaffs_FindOrCreateObjectByNumber
6928 (dev, tags.extraParentObjectId,
6929 YAFFS_OBJECT_TYPE_DIRECTORY);
6930 fileSize = tags.extraFileLength;
6931 isShrink = tags.extraIsShrinkHeader;
6932 equivalentObjectId = tags.extraEquivalentObjectId;
6941 /* directory stuff...
6945 if (parent && parent->variantType ==
6946 YAFFS_OBJECT_TYPE_UNKNOWN) {
6947 /* Set up as a directory */
6948 parent->variantType =
6949 YAFFS_OBJECT_TYPE_DIRECTORY;
6950 YINIT_LIST_HEAD(&parent->variant.
6953 } else if (!parent || parent->variantType !=
6954 YAFFS_OBJECT_TYPE_DIRECTORY) {
6955 /* Hoosterman, another problem....
6956 * We're trying to use a non-directory as a directory
6959 T(YAFFS_TRACE_ERROR,
6961 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6963 parent = dev->lostNFoundDir;
6966 yaffs_AddObjectToDirectory(parent, in);
6968 itsUnlinked = (parent == dev->deletedDir) ||
6969 (parent == dev->unlinkedDir);
6972 /* Mark the block as having a shrinkHeader */
6973 bi->hasShrinkHeader = 1;
6976 /* Note re hardlinks.
6977 * Since we might scan a hardlink before its equivalent object is scanned
6978 * we put them all in a list.
6979 * After scanning is complete, we should have all the objects, so we run
6980 * through this list and fix up all the chains.
6983 switch (in->variantType) {
6984 case YAFFS_OBJECT_TYPE_UNKNOWN:
6985 /* Todo got a problem */
6987 case YAFFS_OBJECT_TYPE_FILE:
6989 if (in->variant.fileVariant.
6990 scannedFileSize < fileSize) {
6991 /* This covers the case where the file size is greater
6992 * than where the data is
6993 * This will happen if the file is resized to be larger
6994 * than its current data extents.
6996 in->variant.fileVariant.fileSize = fileSize;
6997 in->variant.fileVariant.scannedFileSize = fileSize;
7000 if (in->variant.fileVariant.shrinkSize > fileSize)
7001 in->variant.fileVariant.shrinkSize = fileSize;
7005 case YAFFS_OBJECT_TYPE_HARDLINK:
7007 in->variant.hardLinkVariant.equivalentObjectId =
7009 in->hardLinks.next =
7010 (struct ylist_head *) hardList;
7014 case YAFFS_OBJECT_TYPE_DIRECTORY:
7017 case YAFFS_OBJECT_TYPE_SPECIAL:
7020 case YAFFS_OBJECT_TYPE_SYMLINK:
7022 in->variant.symLinkVariant.alias =
7023 yaffs_CloneString(oh->alias);
7024 if (!in->variant.symLinkVariant.alias)
7034 } /* End of scanning for each chunk */
7036 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
7037 /* If we got this far while scanning, then the block is fully allocated. */
7038 state = YAFFS_BLOCK_STATE_FULL;
7042 bi->blockState = state;
7044 /* Now let's see if it was dirty */
7045 if (bi->pagesInUse == 0 &&
7046 !bi->hasShrinkHeader &&
7047 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
7048 yaffs_BlockBecameDirty(dev, blk);
7053 yaffs_SkipRestOfBlock(dev);
7056 YFREE_ALT(blockIndex);
7060 /* Ok, we've done all the scanning.
7061 * Fix up the hard link chains.
7062 * We should now have scanned all the objects, now it's time to add these
7065 yaffs_HardlinkFixup(dev, hardList);
7068 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
7073 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
7078 /*------------------------------ Directory Functions ----------------------------- */
7080 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
7082 struct ylist_head *lh;
7083 yaffs_Object *listObj;
7088 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
7093 if (yaffs_SkipVerification(obj->myDev))
7097 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
7102 if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7103 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
7107 /* Iterate through the objects in each hash entry */
7109 ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
7111 listObj = ylist_entry(lh, yaffs_Object, siblings);
7112 yaffs_VerifyObject(listObj);
7119 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
7124 static void yaffs_VerifyDirectory(yaffs_Object *directory)
7126 struct ylist_head *lh;
7127 yaffs_Object *listObj;
7134 if (yaffs_SkipFullVerification(directory->myDev))
7137 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7138 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
7142 /* Iterate through the objects in each hash entry */
7144 ylist_for_each(lh, &directory->variant.directoryVariant.children) {
7146 listObj = ylist_entry(lh, yaffs_Object, siblings);
7147 if (listObj->parent != directory) {
7148 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
7151 yaffs_VerifyObjectInDirectory(listObj);
7157 *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
7158 * link (ie. name) is created or deleted in the directory.
7161 * create dir/a : update dir's mtime/ctime
7162 * rm dir/a: update dir's mtime/ctime
7163 * modify dir/a: don't update dir's mtimme/ctime
7165 * This can be handled immediately or defered. Defering helps reduce the number
7166 * of updates when many files in a directory are changed within a brief period.
7168 * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
7169 * called periodically.
7172 static void yaffs_UpdateParent(yaffs_Object *obj)
7180 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
7181 if(dev->param.deferDirectoryUpdate){
7182 struct ylist_head *link = &obj->variant.directoryVariant.dirty;
7184 if(ylist_empty(link)){
7185 ylist_add(link,&dev->dirtyDirectories);
7186 T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->objectId));
7190 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7193 void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
7195 struct ylist_head *link;
7197 yaffs_DirectoryStructure *dS;
7198 yaffs_ObjectVariant *oV;
7200 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
7202 while(!ylist_empty(&dev->dirtyDirectories)){
7203 link = dev->dirtyDirectories.next;
7204 ylist_del_init(link);
7206 dS=ylist_entry(link,yaffs_DirectoryStructure,dirty);
7207 oV = ylist_entry(dS,yaffs_ObjectVariant,directoryVariant);
7208 obj = ylist_entry(oV,yaffs_Object,variant);
7210 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
7213 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7217 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
7219 yaffs_Device *dev = obj->myDev;
7220 yaffs_Object *parent;
7222 yaffs_VerifyObjectInDirectory(obj);
7223 parent = obj->parent;
7225 yaffs_VerifyDirectory(parent);
7227 if (dev && dev->param.removeObjectCallback)
7228 dev->param.removeObjectCallback(obj);
7231 ylist_del_init(&obj->siblings);
7234 yaffs_VerifyDirectory(parent);
7237 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
7241 T(YAFFS_TRACE_ALWAYS,
7243 ("tragedy: Trying to add an object to a null pointer directory"
7248 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7249 T(YAFFS_TRACE_ALWAYS,
7251 ("tragedy: Trying to add an object to a non-directory"
7256 if (obj->siblings.prev == NULL) {
7257 /* Not initialised */
7262 yaffs_VerifyDirectory(directory);
7264 yaffs_RemoveObjectFromDirectory(obj);
7268 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7269 obj->parent = directory;
7271 if (directory == obj->myDev->unlinkedDir
7272 || directory == obj->myDev->deletedDir) {
7274 obj->myDev->nUnlinkedFiles++;
7275 obj->renameAllowed = 0;
7278 yaffs_VerifyDirectory(directory);
7279 yaffs_VerifyObjectInDirectory(obj);
7282 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7287 struct ylist_head *i;
7288 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7296 T(YAFFS_TRACE_ALWAYS,
7298 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7303 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7304 T(YAFFS_TRACE_ALWAYS,
7306 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7310 sum = yaffs_CalcNameSum(name);
7312 ylist_for_each(i, &directory->variant.directoryVariant.children) {
7314 l = ylist_entry(i, yaffs_Object, siblings);
7316 if (l->parent != directory)
7319 yaffs_CheckObjectDetailsLoaded(l);
7321 /* Special case for lost-n-found */
7322 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7323 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7325 } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7326 /* LostnFound chunk called Objxxx
7329 yaffs_GetObjectName(l, buffer,
7330 YAFFS_MAX_NAME_LENGTH + 1);
7331 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7342 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7343 int (*fn) (yaffs_Object *))
7345 struct ylist_head *i;
7349 T(YAFFS_TRACE_ALWAYS,
7351 ("tragedy: yaffs_FindObjectByName: null pointer directory"
7356 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7357 T(YAFFS_TRACE_ALWAYS,
7359 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7364 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7366 l = ylist_entry(i, yaffs_Object, siblings);
7377 /* GetEquivalentObject dereferences any hard links to get to the
7381 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7383 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7384 /* We want the object id of the equivalent object, not this one */
7385 obj = obj->variant.hardLinkVariant.equivalentObject;
7386 yaffs_CheckObjectDetailsLoaded(obj);
7391 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7393 memset(name, 0, buffSize * sizeof(YCHAR));
7395 yaffs_CheckObjectDetailsLoaded(obj);
7397 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7398 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7399 } else if (obj->hdrChunk <= 0) {
7401 YCHAR numString[20];
7402 YCHAR *x = &numString[19];
7403 unsigned v = obj->objectId;
7407 *x = '0' + (v % 10);
7410 /* make up a name */
7411 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7412 yaffs_strcat(locName, x);
7413 yaffs_strncpy(name, locName, buffSize - 1);
7416 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7417 else if (obj->shortName[0])
7418 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7422 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7424 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7426 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7428 if (obj->hdrChunk > 0) {
7429 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7430 obj->hdrChunk, buffer,
7433 yaffs_strncpy(name, oh->name, buffSize - 1);
7436 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7439 return yaffs_strnlen(name,buffSize-1);
7442 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7444 /* Dereference any hard linking */
7445 obj = yaffs_GetEquivalentObject(obj);
7447 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7448 return obj->variant.fileVariant.fileSize;
7449 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7450 if(!obj->variant.symLinkVariant.alias)
7452 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7454 /* Only a directory should drop through to here */
7455 return obj->myDev->nDataBytesPerChunk;
7459 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7462 struct ylist_head *i;
7465 count++; /* the object itself */
7467 ylist_for_each(i, &obj->hardLinks)
7468 count++; /* add the hard links; */
7473 int yaffs_GetObjectInode(yaffs_Object *obj)
7475 obj = yaffs_GetEquivalentObject(obj);
7477 return obj->objectId;
7480 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7482 obj = yaffs_GetEquivalentObject(obj);
7484 switch (obj->variantType) {
7485 case YAFFS_OBJECT_TYPE_FILE:
7488 case YAFFS_OBJECT_TYPE_DIRECTORY:
7491 case YAFFS_OBJECT_TYPE_SYMLINK:
7494 case YAFFS_OBJECT_TYPE_HARDLINK:
7497 case YAFFS_OBJECT_TYPE_SPECIAL:
7498 if (S_ISFIFO(obj->yst_mode))
7500 if (S_ISCHR(obj->yst_mode))
7502 if (S_ISBLK(obj->yst_mode))
7504 if (S_ISSOCK(obj->yst_mode))
7512 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7514 obj = yaffs_GetEquivalentObject(obj);
7515 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7516 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7518 return yaffs_CloneString(_Y(""));
7521 #ifndef CONFIG_YAFFS_WINCE
7523 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7525 unsigned int valid = attr->ia_valid;
7527 if (valid & ATTR_MODE)
7528 obj->yst_mode = attr->ia_mode;
7529 if (valid & ATTR_UID)
7530 obj->yst_uid = attr->ia_uid;
7531 if (valid & ATTR_GID)
7532 obj->yst_gid = attr->ia_gid;
7534 if (valid & ATTR_ATIME)
7535 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7536 if (valid & ATTR_CTIME)
7537 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7538 if (valid & ATTR_MTIME)
7539 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7541 if (valid & ATTR_SIZE)
7542 yaffs_ResizeFile(obj, attr->ia_size);
7544 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7549 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7551 unsigned int valid = 0;
7553 attr->ia_mode = obj->yst_mode;
7555 attr->ia_uid = obj->yst_uid;
7557 attr->ia_gid = obj->yst_gid;
7560 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7561 valid |= ATTR_ATIME;
7562 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7563 valid |= ATTR_CTIME;
7564 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7565 valid |= ATTR_MTIME;
7567 attr->ia_size = yaffs_GetFileSize(obj);
7570 attr->ia_valid = valid;
7578 int yaffs_DumpObject(yaffs_Object *obj)
7582 yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7584 T(YAFFS_TRACE_ALWAYS,
7586 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7587 " chunk %d type %d size %d\n"
7588 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7589 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7590 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7596 /*---------------------------- Initialisation code -------------------------------------- */
7598 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7601 /* Common functions, gotta have */
7602 if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
7605 #ifdef CONFIG_YAFFS_YAFFS2
7607 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7608 if (dev->param.writeChunkWithTagsToNAND &&
7609 dev->param.readChunkWithTagsFromNAND &&
7610 !dev->param.writeChunkToNAND &&
7611 !dev->param.readChunkFromNAND &&
7612 dev->param.markNANDBlockBad &&
7613 dev->param.queryNANDBlock)
7617 /* Can use the "spare" style interface for yaffs1 */
7618 if (!dev->param.isYaffs2 &&
7619 !dev->param.writeChunkWithTagsToNAND &&
7620 !dev->param.readChunkWithTagsFromNAND &&
7621 dev->param.writeChunkToNAND &&
7622 dev->param.readChunkFromNAND &&
7623 !dev->param.markNANDBlockBad &&
7624 !dev->param.queryNANDBlock)
7631 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7633 /* Initialise the unlinked, deleted, root and lost and found directories */
7635 dev->lostNFoundDir = dev->rootDir = NULL;
7636 dev->unlinkedDir = dev->deletedDir = NULL;
7639 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7642 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7645 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7646 YAFFS_ROOT_MODE | S_IFDIR);
7647 dev->lostNFoundDir =
7648 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7649 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7651 if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7652 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7659 int yaffs_GutsInitialise(yaffs_Device *dev)
7661 int init_failed = 0;
7665 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7667 /* Check stuff that must be set */
7670 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7674 dev->internalStartBlock = dev->param.startBlock;
7675 dev->internalEndBlock = dev->param.endBlock;
7676 dev->blockOffset = 0;
7677 dev->chunkOffset = 0;
7678 dev->nFreeChunks = 0;
7682 if (dev->param.startBlock == 0) {
7683 dev->internalStartBlock = dev->param.startBlock + 1;
7684 dev->internalEndBlock = dev->param.endBlock + 1;
7685 dev->blockOffset = 1;
7686 dev->chunkOffset = dev->param.nChunksPerBlock;
7689 /* Check geometry parameters. */
7691 if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
7692 (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
7693 (dev->param.inbandTags && !dev->param.isYaffs2) ||
7694 dev->param.nChunksPerBlock < 2 ||
7695 dev->param.nReservedBlocks < 2 ||
7696 dev->internalStartBlock <= 0 ||
7697 dev->internalEndBlock <= 0 ||
7698 dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) { /* otherwise it is too small */
7699 T(YAFFS_TRACE_ALWAYS,
7701 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7702 TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
7706 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7707 T(YAFFS_TRACE_ALWAYS,
7708 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7712 /* Sort out space for inband tags, if required */
7713 if (dev->param.inbandTags)
7714 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7716 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
7718 /* Got the right mix of functions? */
7719 if (!yaffs_CheckDevFunctions(dev)) {
7720 /* Function missing */
7721 T(YAFFS_TRACE_ALWAYS,
7723 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7728 /* This is really a compilation check. */
7729 if (!yaffs_CheckStructures()) {
7730 T(YAFFS_TRACE_ALWAYS,
7731 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7735 if (dev->isMounted) {
7736 T(YAFFS_TRACE_ALWAYS,
7737 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7741 /* Finished with most checks. One or two more checks happen later on too. */
7745 /* OK now calculate a few things for the device */
7748 * Calculate all the chunk size manipulation numbers:
7750 x = dev->nDataBytesPerChunk;
7751 /* We always use dev->chunkShift and dev->chunkDiv */
7752 dev->chunkShift = Shifts(x);
7753 x >>= dev->chunkShift;
7755 /* We only use chunk mask if chunkDiv is 1 */
7756 dev->chunkMask = (1<<dev->chunkShift) - 1;
7759 * Calculate chunkGroupBits.
7760 * We need to find the next power of 2 > than internalEndBlock
7763 x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
7767 /* Set up tnode width if wide tnodes are enabled. */
7768 if (!dev->param.wideTnodesDisabled) {
7769 /* bits must be even so that we end up with 32-bit words */
7773 dev->tnodeWidth = 16;
7775 dev->tnodeWidth = bits;
7777 dev->tnodeWidth = 16;
7779 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7781 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7782 * so if the bitwidth of the
7783 * chunk range we're using is greater than 16 we need
7784 * to figure out chunk shift and chunkGroupSize
7787 if (bits <= dev->tnodeWidth)
7788 dev->chunkGroupBits = 0;
7790 dev->chunkGroupBits = bits - dev->tnodeWidth;
7793 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7795 if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
7796 /* We have a problem because the soft delete won't work if
7797 * the chunk group size > chunks per block.
7798 * This can be remedied by using larger "virtual blocks".
7800 T(YAFFS_TRACE_ALWAYS,
7801 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7806 /* OK, we've finished verifying the device, lets continue with initialisation */
7808 /* More device initialisation */
7809 dev->garbageCollections = 0;
7810 dev->passiveGarbageCollections = 0;
7811 dev->currentDirtyChecker = 0;
7812 dev->bufferedBlock = -1;
7813 dev->doingBufferedBlockRewrite = 0;
7814 dev->nDeletedFiles = 0;
7815 dev->nBackgroundDeletions = 0;
7816 dev->nUnlinkedFiles = 0;
7818 dev->eccUnfixed = 0;
7819 dev->tagsEccFixed = 0;
7820 dev->tagsEccUnfixed = 0;
7821 dev->nErasureFailures = 0;
7822 dev->nErasedBlocks = 0;
7824 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7825 YINIT_LIST_HEAD(&dev->dirtyDirectories);
7826 dev->oldestDirtySequence = 0;
7828 /* Initialise temporary buffers and caches. */
7829 if (!yaffs_InitialiseTempBuffers(dev))
7832 dev->srCache = NULL;
7833 dev->gcCleanupList = NULL;
7837 dev->param.nShortOpCaches > 0) {
7840 int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
7842 if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7843 dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7845 dev->srCache = YMALLOC(srCacheBytes);
7847 buf = (__u8 *) dev->srCache;
7850 memset(dev->srCache, 0, srCacheBytes);
7852 for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
7853 dev->srCache[i].object = NULL;
7854 dev->srCache[i].lastUse = 0;
7855 dev->srCache[i].dirty = 0;
7856 dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
7867 dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
7868 if (!dev->gcCleanupList)
7872 if (dev->param.isYaffs2)
7873 dev->param.useHeaderFileSize = 1;
7875 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7878 yaffs_InitialiseTnodes(dev);
7879 yaffs_InitialiseObjects(dev);
7881 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7886 /* Now scan the flash. */
7887 if (dev->param.isYaffs2) {
7888 if (yaffs_CheckpointRestore(dev)) {
7889 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7890 T(YAFFS_TRACE_ALWAYS,
7891 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7894 /* Clean up the mess caused by an aborted checkpoint load
7895 * and scan backwards.
7897 yaffs_DeinitialiseBlocks(dev);
7898 yaffs_DeinitialiseTnodes(dev);
7899 yaffs_DeinitialiseObjects(dev);
7902 dev->nErasedBlocks = 0;
7903 dev->nFreeChunks = 0;
7904 dev->allocationBlock = -1;
7905 dev->allocationPage = -1;
7906 dev->nDeletedFiles = 0;
7907 dev->nUnlinkedFiles = 0;
7908 dev->nBackgroundDeletions = 0;
7910 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7913 yaffs_InitialiseTnodes(dev);
7914 yaffs_InitialiseObjects(dev);
7916 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7919 if (!init_failed && !yaffs_ScanBackwards(dev))
7922 } else if (!yaffs_Scan(dev))
7925 yaffs_StripDeletedObjects(dev);
7926 yaffs_FixHangingObjects(dev);
7927 if(dev->param.emptyLostAndFound)
7928 yaffs_EmptyLostAndFound(dev);
7932 /* Clean up the mess */
7933 T(YAFFS_TRACE_TRACING,
7934 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7936 yaffs_Deinitialise(dev);
7940 /* Zero out stats */
7941 dev->nPageReads = 0;
7942 dev->nPageWrites = 0;
7943 dev->nBlockErasures = 0;
7945 dev->nRetriedWrites = 0;
7947 dev->nRetiredBlocks = 0;
7949 yaffs_VerifyFreeChunks(dev);
7950 yaffs_VerifyBlocks(dev);
7952 /* Clean up any aborted checkpoint data */
7953 if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
7954 yaffs_InvalidateCheckpoint(dev);
7956 T(YAFFS_TRACE_TRACING,
7957 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7962 void yaffs_Deinitialise(yaffs_Device *dev)
7964 if (dev->isMounted) {
7967 yaffs_DeinitialiseBlocks(dev);
7968 yaffs_DeinitialiseTnodes(dev);
7969 yaffs_DeinitialiseObjects(dev);
7970 if (dev->param.nShortOpCaches > 0 &&
7973 for (i = 0; i < dev->param.nShortOpCaches; i++) {
7974 if (dev->srCache[i].data)
7975 YFREE(dev->srCache[i].data);
7976 dev->srCache[i].data = NULL;
7979 YFREE(dev->srCache);
7980 dev->srCache = NULL;
7983 YFREE(dev->gcCleanupList);
7985 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7986 YFREE(dev->tempBuffer[i].buffer);
7990 if (dev->param.deinitialiseNAND)
7991 dev->param.deinitialiseNAND(dev);
7995 static int yaffs_CountFreeChunks(yaffs_Device *dev)
8000 yaffs_BlockInfo *blk;
8002 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
8004 blk = yaffs_GetBlockInfo(dev, b);
8006 switch (blk->blockState) {
8007 case YAFFS_BLOCK_STATE_EMPTY:
8008 case YAFFS_BLOCK_STATE_ALLOCATING:
8009 case YAFFS_BLOCK_STATE_COLLECTING:
8010 case YAFFS_BLOCK_STATE_FULL:
8012 (dev->param.nChunksPerBlock - blk->pagesInUse +
8013 blk->softDeletions);
8023 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
8025 /* This is what we report to the outside world */
8028 int nDirtyCacheChunks;
8029 int blocksForCheckpoint;
8033 nFree = dev->nFreeChunks;
8035 nFree = yaffs_CountFreeChunks(dev);
8038 nFree += dev->nDeletedFiles;
8040 /* Now count the number of dirty chunks in the cache and subtract those */
8042 for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
8043 if (dev->srCache[i].dirty)
8044 nDirtyCacheChunks++;
8047 nFree -= nDirtyCacheChunks;
8049 nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
8051 /* Now we figure out how much to reserve for the checkpoint and report that... */
8052 blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
8053 if (blocksForCheckpoint < 0)
8054 blocksForCheckpoint = 0;
8056 nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
8065 static int yaffs_freeVerificationFailures;
8067 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
8072 if (yaffs_SkipVerification(dev))
8075 counted = yaffs_CountFreeChunks(dev);
8077 difference = dev->nFreeChunks - counted;
8080 T(YAFFS_TRACE_ALWAYS,
8081 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
8082 dev->nFreeChunks, counted, difference));
8083 yaffs_freeVerificationFailures++;
8087 /*---------------------------------------- YAFFS test code ----------------------*/
8089 #define yaffs_CheckStruct(structure, syze, name) \
8091 if (sizeof(structure) != syze) { \
8092 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
8093 name, syze, (int) sizeof(structure))); \
8094 return YAFFS_FAIL; \
8098 static int yaffs_CheckStructures(void)
8100 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
8101 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
8102 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
8103 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
8104 /* yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
8106 #ifndef CONFIG_YAFFS_WINCE
8107 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");