2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
4 * Copyright (C) 2002 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.
15 const char *yaffs_guts_c_version =
16 "$Id: yaffs_guts.c,v 1.33 2006-05-17 09:20:26 charles Exp $";
20 #include "yaffsinterface.h"
21 #include "yaffs_guts.h"
22 #include "yaffs_tagsvalidity.h"
24 #include "yaffs_tagscompat.h"
25 #include "yaffs_nand.h"
27 #include "yaffs_checkptrw.h"
29 #include "yaffs_nand.h"
32 #ifdef CONFIG_YAFFS_WINCE
33 void yfsd_LockYAFFS(BOOL fsLockOnly);
34 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
37 #define YAFFS_PASSIVE_GC_CHUNKS 2
39 #include "yaffs_ecc.h"
42 /* Robustification (if it ever comes about...) */
43 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
44 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND);
45 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
47 const yaffs_ExtendedTags * tags);
48 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
49 const yaffs_ExtendedTags * tags);
51 /* Other local prototypes */
52 static int yaffs_UnlinkObject( yaffs_Object *obj);
54 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
56 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
58 yaffs_ExtendedTags * tags,
60 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
61 int chunkInNAND, int inScan);
63 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
64 yaffs_ObjectType type);
65 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
67 static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
68 int force, int isShrink, int shadows);
69 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
70 static int yaffs_CheckStructures(void);
71 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
72 int chunkOffset, int *limit);
73 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
75 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
77 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
78 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
81 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
84 static int yaffs_UnlinkWorker(yaffs_Object * obj);
85 static void yaffs_DestroyObject(yaffs_Object * obj);
87 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
90 loff_t yaffs_GetFileSize(yaffs_Object * obj);
92 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve);
94 static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
97 static int yaffs_CheckFileSanity(yaffs_Object * in);
99 #define yaffs_CheckFileSanity(in)
102 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
103 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
105 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
108 * Temporary buffer manipulations.
111 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
114 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
115 if (dev->tempBuffer[i].line == 0) {
116 dev->tempBuffer[i].line = lineNo;
117 if ((i + 1) > dev->maxTemp) {
118 dev->maxTemp = i + 1;
119 for (j = 0; j <= i; j++)
120 dev->tempBuffer[j].maxLine =
121 dev->tempBuffer[j].line;
124 return dev->tempBuffer[i].buffer;
128 T(YAFFS_TRACE_BUFFERS,
129 (TSTR("Out of temp buffers at line %d, other held by lines:"),
131 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
132 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
134 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
137 * If we got here then we have to allocate an unmanaged one
141 dev->unmanagedTempAllocations++;
142 return YMALLOC(dev->nBytesPerChunk);
146 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
150 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
151 if (dev->tempBuffer[i].buffer == buffer) {
152 dev->tempBuffer[i].line = 0;
158 /* assume it is an unmanaged one. */
159 T(YAFFS_TRACE_BUFFERS,
160 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
163 dev->unmanagedTempDeallocations++;
169 * Chunk bitmap manipulations
172 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
174 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
176 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
180 return dev->chunkBits +
181 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
184 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
186 __u8 *blkBits = yaffs_BlockBits(dev, blk);
188 memset(blkBits, 0, dev->chunkBitmapStride);
191 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
193 __u8 *blkBits = yaffs_BlockBits(dev, blk);
195 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
198 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
200 __u8 *blkBits = yaffs_BlockBits(dev, blk);
202 blkBits[chunk / 8] |= (1 << (chunk & 7));
205 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
207 __u8 *blkBits = yaffs_BlockBits(dev, blk);
208 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
211 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
213 __u8 *blkBits = yaffs_BlockBits(dev, blk);
215 for (i = 0; i < dev->chunkBitmapStride; i++) {
224 * Simple hash function. Needs to have a reasonable spread
227 static Y_INLINE int yaffs_HashFunction(int n)
230 return (n % YAFFS_NOBJECT_BUCKETS);
234 * Access functions to useful fake objects
237 yaffs_Object *yaffs_Root(yaffs_Device * dev)
242 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
244 return dev->lostNFoundDir;
249 * Erased NAND checking functions
252 int yaffs_CheckFF(__u8 * buffer, int nBytes)
254 /* Horrible, slow implementation */
263 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
267 int retval = YAFFS_OK;
268 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
269 yaffs_ExtendedTags tags;
271 yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
273 if (!yaffs_CheckFF(data, dev->nBytesPerChunk) || tags.chunkUsed) {
274 T(YAFFS_TRACE_NANDACCESS,
275 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
279 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
285 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
287 yaffs_ExtendedTags * tags,
295 yaffs_InvalidateCheckpoint(dev);
298 chunk = yaffs_AllocateChunk(dev, useReserve);
302 /* First check this chunk is erased... */
303 #ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
304 writeOk = yaffs_CheckChunkErased(dev, chunk);
309 ("**>> yaffs chunk %d was not erased"
313 yaffs_WriteChunkWithTagsToNAND(dev, chunk,
320 * Copy the data into the robustification buffer.
321 * NB We do this at the end to prevent duplicates in the case of a write error.
324 yaffs_HandleWriteChunkOk(dev, chunk, data,
327 yaffs_HandleWriteChunkError(dev, chunk);
331 } while (chunk >= 0 && !writeOk);
335 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
337 dev->nRetriedWrites += (attempts - 1);
344 * Block retiring for handling a broken block.
347 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
350 yaffs_InvalidateCheckpoint(dev);
352 yaffs_MarkBlockBad(dev, blockInNAND);
354 yaffs_GetBlockInfo(dev, blockInNAND)->blockState =
355 YAFFS_BLOCK_STATE_DEAD;
357 dev->nRetiredBlocks++;
361 * Functions for robustisizing TODO
365 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
367 const yaffs_ExtendedTags * tags)
371 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
372 const yaffs_ExtendedTags * tags)
376 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND)
378 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
380 /* Mark the block for retirement */
381 yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
382 /* Delete the chunk */
383 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
387 /*---------------- Name handling functions ------------*/
389 static __u16 yaffs_CalcNameSum(const YCHAR * name)
394 YUCHAR *bname = (YUCHAR *) name;
396 while ((*bname) && (i <= YAFFS_MAX_NAME_LENGTH)) {
398 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
399 sum += yaffs_toupper(*bname) * i;
410 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
412 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
413 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
414 yaffs_strcpy(obj->shortName, name);
416 obj->shortName[0] = _Y('\0');
419 obj->sum = yaffs_CalcNameSum(name);
422 /*-------------------- TNODES -------------------
424 * List of spare tnodes
425 * The list is hooked together using the first pointer
429 /* yaffs_CreateTnodes creates a bunch more tnodes and
430 * adds them to the tnode free list.
431 * Don't use this function directly
434 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
438 yaffs_Tnode *newTnodes;
442 yaffs_TnodeList *tnl;
447 /* Calculate the tnode size in bytes for variable width tnode support.
448 * Must be a multiple of 32-bits */
449 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
451 /* make these things */
453 newTnodes = YMALLOC(nTnodes * tnodeSize);
454 mem = (__u8 *)newTnodes;
458 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
462 /* Hook them into the free list */
464 for (i = 0; i < nTnodes - 1; i++) {
465 newTnodes[i].internal[0] = &newTnodes[i + 1];
466 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
467 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
471 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
472 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
473 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
475 dev->freeTnodes = newTnodes;
477 /* New hookup for wide tnodes */
478 for(i = 0; i < nTnodes -1; i++) {
479 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
480 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
481 curr->internal[0] = next;
484 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
485 curr->internal[0] = dev->freeTnodes;
486 dev->freeTnodes = (yaffs_Tnode *)mem;
491 dev->nFreeTnodes += nTnodes;
492 dev->nTnodesCreated += nTnodes;
494 /* Now add this bunch of tnodes to a list for freeing up.
495 * NB If we can't add this to the management list it isn't fatal
496 * but it just means we can't free this bunch of tnodes later.
499 tnl = YMALLOC(sizeof(yaffs_TnodeList));
503 ("yaffs: Could not add tnodes to management list" TENDSTR)));
506 tnl->tnodes = newTnodes;
507 tnl->next = dev->allocatedTnodeList;
508 dev->allocatedTnodeList = tnl;
511 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
516 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
518 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
520 yaffs_Tnode *tn = NULL;
522 /* If there are none left make more */
523 if (!dev->freeTnodes) {
524 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
527 if (dev->freeTnodes) {
528 tn = dev->freeTnodes;
529 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
530 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
531 /* Hoosterman, this thing looks like it isn't in the list */
532 T(YAFFS_TRACE_ALWAYS,
533 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
536 dev->freeTnodes = dev->freeTnodes->internal[0];
543 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
545 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
548 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
553 /* FreeTnode frees up a tnode and puts it back on the free list */
554 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
557 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
558 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
559 /* Hoosterman, this thing looks like it is already in the list */
560 T(YAFFS_TRACE_ALWAYS,
561 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
563 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
565 tn->internal[0] = dev->freeTnodes;
566 dev->freeTnodes = tn;
571 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
573 /* Free the list of allocated tnodes */
574 yaffs_TnodeList *tmp;
576 while (dev->allocatedTnodeList) {
577 tmp = dev->allocatedTnodeList->next;
579 YFREE(dev->allocatedTnodeList->tnodes);
580 YFREE(dev->allocatedTnodeList);
581 dev->allocatedTnodeList = tmp;
585 dev->freeTnodes = NULL;
586 dev->nFreeTnodes = 0;
589 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
591 dev->allocatedTnodeList = NULL;
592 dev->freeTnodes = NULL;
593 dev->nFreeTnodes = 0;
594 dev->nTnodesCreated = 0;
599 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
601 __u32 *map = (__u32 *)tn;
607 pos &= YAFFS_TNODES_LEVEL0_MASK;
608 val >>= dev->chunkGroupBits;
610 bitInMap = pos * dev->tnodeWidth;
611 wordInMap = bitInMap /32;
612 bitInWord = bitInMap & (32 -1);
614 mask = dev->tnodeMask << bitInWord;
616 map[wordInMap] &= ~mask;
617 map[wordInMap] |= (mask & (val << bitInWord));
619 if(dev->tnodeWidth > (32-bitInWord)) {
620 bitInWord = (32 - bitInWord);
622 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
623 map[wordInMap] &= ~mask;
624 map[wordInMap] |= (mask & (val >> bitInWord));
628 __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
630 __u32 *map = (__u32 *)tn;
636 pos &= YAFFS_TNODES_LEVEL0_MASK;
638 bitInMap = pos * dev->tnodeWidth;
639 wordInMap = bitInMap /32;
640 bitInWord = bitInMap & (32 -1);
642 val = map[wordInMap] >> bitInWord;
644 if(dev->tnodeWidth > (32-bitInWord)) {
645 bitInWord = (32 - bitInWord);
647 val |= (map[wordInMap] << bitInWord);
650 val &= dev->tnodeMask;
651 val <<= dev->chunkGroupBits;
656 /* ------------------- End of individual tnode manipulation -----------------*/
658 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
659 * The look up tree is represented by the top tnode and the number of topLevel
660 * in the tree. 0 means only the level 0 tnode is in the tree.
663 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
664 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
665 yaffs_FileStructure * fStruct,
669 yaffs_Tnode *tn = fStruct->top;
671 int requiredTallness;
672 int level = fStruct->topLevel;
674 /* Check sane level and chunk Id */
675 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
679 if (chunkId > YAFFS_MAX_CHUNK_ID) {
683 /* First check we're tall enough (ie enough topLevel) */
685 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
686 requiredTallness = 0;
688 i >>= YAFFS_TNODES_INTERNAL_BITS;
692 if (requiredTallness > fStruct->topLevel) {
693 /* Not tall enough, so we can't find it, return NULL. */
697 /* Traverse down to level 0 */
698 while (level > 0 && tn) {
701 ( YAFFS_TNODES_LEVEL0_BITS +
703 YAFFS_TNODES_INTERNAL_BITS)
705 YAFFS_TNODES_INTERNAL_MASK];
713 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
714 * This happens in two steps:
715 * 1. If the tree isn't tall enough, then make it taller.
716 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
718 * Used when modifying the tree.
720 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
721 * be plugged into the ttree.
724 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
725 yaffs_FileStructure * fStruct,
727 yaffs_Tnode *passedTn)
730 int requiredTallness;
738 /* Check sane level and page Id */
739 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
743 if (chunkId > YAFFS_MAX_CHUNK_ID) {
747 /* First check we're tall enough (ie enough topLevel) */
749 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
750 requiredTallness = 0;
752 x >>= YAFFS_TNODES_INTERNAL_BITS;
757 if (requiredTallness > fStruct->topLevel) {
758 /* Not tall enough,gotta make the tree taller */
759 for (i = fStruct->topLevel; i < requiredTallness; i++) {
761 tn = yaffs_GetTnode(dev);
764 tn->internal[0] = fStruct->top;
768 (TSTR("yaffs: no more tnodes" TENDSTR)));
772 fStruct->topLevel = requiredTallness;
775 /* Traverse down to level 0, adding anything we need */
777 l = fStruct->topLevel;
781 while (l > 0 && tn) {
783 ( YAFFS_TNODES_LEVEL0_BITS +
784 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
785 YAFFS_TNODES_INTERNAL_MASK;
788 if((l>1) && !tn->internal[x]){
789 /* Add missing non-level-zero tnode */
790 tn->internal[x] = yaffs_GetTnode(dev);
793 /* Looking from level 1 at level 0 */
795 /* If we already have one, then release it.*/
797 yaffs_FreeTnode(dev,tn->internal[x]);
798 tn->internal[x] = passedTn;
800 } else if(!tn->internal[x]) {
801 /* Don't have one, none passed in */
802 tn->internal[x] = yaffs_GetTnode(dev);
806 tn = tn->internal[x];
812 memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
813 yaffs_FreeTnode(dev,passedTn);
820 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
821 yaffs_ExtendedTags * tags, int objectId,
826 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
827 if (yaffs_CheckChunkBit
828 (dev, theChunk / dev->nChunksPerBlock,
829 theChunk % dev->nChunksPerBlock)) {
830 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
832 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
844 /* DeleteWorker scans backwards through the tnode tree and deletes all the
845 * chunks and tnodes in the file
846 * Returns 1 if the tree was deleted.
847 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
850 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
851 int chunkOffset, int *limit)
856 yaffs_ExtendedTags tags;
858 yaffs_Device *dev = in->myDev;
865 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
867 if (tn->internal[i]) {
868 if (limit && (*limit) < 0) {
872 yaffs_DeleteWorker(in,
880 YAFFS_TNODES_INTERNAL_BITS)
888 tn->internal[i] = NULL;
893 return (allDone) ? 1 : 0;
894 } else if (level == 0) {
897 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
899 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
904 YAFFS_TNODES_LEVEL0_BITS) + i;
907 yaffs_FindChunkInGroup(dev,
913 if (foundChunk > 0) {
914 yaffs_DeleteChunk(dev,
927 yaffs_PutLevel0Tnode(dev,tn,i,0);
931 return (i < 0) ? 1 : 0;
941 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
944 yaffs_BlockInfo *theBlock;
946 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
948 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
950 theBlock->softDeletions++;
955 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
956 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
958 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
961 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
962 __u32 level, int chunkOffset)
967 yaffs_Device *dev = in->myDev;
972 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
974 if (tn->internal[i]) {
976 yaffs_SoftDeleteWorker(in,
982 YAFFS_TNODES_INTERNAL_BITS)
988 tn->internal[i] = NULL;
990 /* Hoosterman... how could this happen? */
994 return (allDone) ? 1 : 0;
995 } else if (level == 0) {
997 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
998 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1000 /* Note this does not find the real chunk, only the chunk group.
1001 * We make an assumption that a chunk group is not larger than
1004 yaffs_SoftDeleteChunk(dev, theChunk);
1005 yaffs_PutLevel0Tnode(dev,tn,i,0);
1019 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1022 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1023 if (obj->nDataChunks <= 0) {
1024 /* Empty file with no duplicate object headers, just delete it immediately */
1025 yaffs_FreeTnode(obj->myDev,
1026 obj->variant.fileVariant.top);
1027 obj->variant.fileVariant.top = NULL;
1028 T(YAFFS_TRACE_TRACING,
1029 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1031 yaffs_DoGenericObjectDeletion(obj);
1033 yaffs_SoftDeleteWorker(obj,
1034 obj->variant.fileVariant.top,
1035 obj->variant.fileVariant.
1037 obj->softDeleted = 1;
1042 /* Pruning removes any part of the file structure tree that is beyond the
1043 * bounds of the file (ie that does not point to chunks).
1045 * A file should only get pruned when its size is reduced.
1047 * Before pruning, the chunks must be pulled from the tree and the
1048 * level 0 tnode entries must be zeroed out.
1049 * Could also use this for file deletion, but that's probably better handled
1050 * by a special case.
1053 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1054 __u32 level, int del0)
1062 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1063 if (tn->internal[i] && level > 0) {
1065 yaffs_PruneWorker(dev, tn->internal[i],
1067 (i == 0) ? del0 : 1);
1070 if (tn->internal[i]) {
1075 if (hasData == 0 && del0) {
1076 /* Free and return NULL */
1078 yaffs_FreeTnode(dev, tn);
1088 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1089 yaffs_FileStructure * fStruct)
1096 if (fStruct->topLevel > 0) {
1098 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1100 /* Now we have a tree with all the non-zero branches NULL but the height
1101 * is the same as it was.
1102 * Let's see if we can trim internal tnodes to shorten the tree.
1103 * We can do this if only the 0th element in the tnode is in use
1104 * (ie all the non-zero are NULL)
1107 while (fStruct->topLevel && !done) {
1111 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1112 if (tn->internal[i]) {
1118 fStruct->top = tn->internal[0];
1119 fStruct->topLevel--;
1120 yaffs_FreeTnode(dev, tn);
1130 /*-------------------- End of File Structure functions.-------------------*/
1132 /* yaffs_CreateFreeObjects creates a bunch more objects and
1133 * adds them to the object free list.
1135 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1138 yaffs_Object *newObjects;
1139 yaffs_ObjectList *list;
1144 /* make these things */
1145 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1148 T(YAFFS_TRACE_ALLOCATE,
1149 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1153 /* Hook them into the free list */
1154 for (i = 0; i < nObjects - 1; i++) {
1155 newObjects[i].siblings.next =
1156 (struct list_head *)(&newObjects[i + 1]);
1159 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1160 dev->freeObjects = newObjects;
1161 dev->nFreeObjects += nObjects;
1162 dev->nObjectsCreated += nObjects;
1164 /* Now add this bunch of Objects to a list for freeing up. */
1166 list = YMALLOC(sizeof(yaffs_ObjectList));
1168 T(YAFFS_TRACE_ALLOCATE,
1169 (TSTR("Could not add objects to management list" TENDSTR)));
1171 list->objects = newObjects;
1172 list->next = dev->allocatedObjectList;
1173 dev->allocatedObjectList = list;
1180 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1181 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1183 yaffs_Object *tn = NULL;
1185 /* If there are none left make more */
1186 if (!dev->freeObjects) {
1187 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1190 if (dev->freeObjects) {
1191 tn = dev->freeObjects;
1193 (yaffs_Object *) (dev->freeObjects->siblings.next);
1194 dev->nFreeObjects--;
1196 /* Now sweeten it up... */
1198 memset(tn, 0, sizeof(yaffs_Object));
1201 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1202 INIT_LIST_HEAD(&(tn->hardLinks));
1203 INIT_LIST_HEAD(&(tn->hashLink));
1204 INIT_LIST_HEAD(&tn->siblings);
1206 /* Add it to the lost and found directory.
1207 * NB Can't put root or lostNFound in lostNFound so
1208 * check if lostNFound exists first
1210 if (dev->lostNFoundDir) {
1211 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1218 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1223 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1225 obj->fake = 1; /* it is fake so it has no NAND presence... */
1226 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1227 obj->unlinkAllowed = 0; /* ... or unlink it */
1230 obj->yst_mode = mode;
1232 obj->chunkId = 0; /* Not a valid chunk. */
1239 static void yaffs_UnhashObject(yaffs_Object * tn)
1242 yaffs_Device *dev = tn->myDev;
1244 /* If it is still linked into the bucket list, free from the list */
1245 if (!list_empty(&tn->hashLink)) {
1246 list_del_init(&tn->hashLink);
1247 bucket = yaffs_HashFunction(tn->objectId);
1248 dev->objectBucket[bucket].count--;
1253 /* FreeObject frees up a Object and puts it back on the free list */
1254 static void yaffs_FreeObject(yaffs_Object * tn)
1257 yaffs_Device *dev = tn->myDev;
1261 /* We're still hooked up to a cached inode.
1262 * Don't delete now, but mark for later deletion
1264 tn->deferedFree = 1;
1269 yaffs_UnhashObject(tn);
1271 /* Link into the free list. */
1272 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1273 dev->freeObjects = tn;
1274 dev->nFreeObjects++;
1279 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1281 if (obj->deferedFree) {
1282 yaffs_FreeObject(obj);
1288 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1290 /* Free the list of allocated Objects */
1292 yaffs_ObjectList *tmp;
1294 while (dev->allocatedObjectList) {
1295 tmp = dev->allocatedObjectList->next;
1296 YFREE(dev->allocatedObjectList->objects);
1297 YFREE(dev->allocatedObjectList);
1299 dev->allocatedObjectList = tmp;
1302 dev->freeObjects = NULL;
1303 dev->nFreeObjects = 0;
1306 static void yaffs_InitialiseObjects(yaffs_Device * dev)
1310 dev->allocatedObjectList = NULL;
1311 dev->freeObjects = NULL;
1312 dev->nFreeObjects = 0;
1314 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1315 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1316 dev->objectBucket[i].count = 0;
1321 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
1326 int lowest = 999999;
1328 /* First let's see if we can find one that's empty. */
1330 for (i = 0; i < 10 && lowest > 0; i++) {
1332 x %= YAFFS_NOBJECT_BUCKETS;
1333 if (dev->objectBucket[x].count < lowest) {
1334 lowest = dev->objectBucket[x].count;
1340 /* If we didn't find an empty list, then try
1341 * looking a bit further for a short one
1344 for (i = 0; i < 10 && lowest > 3; i++) {
1346 x %= YAFFS_NOBJECT_BUCKETS;
1347 if (dev->objectBucket[x].count < lowest) {
1348 lowest = dev->objectBucket[x].count;
1357 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
1359 int bucket = yaffs_FindNiceObjectBucket(dev);
1361 /* Now find an object value that has not already been taken
1362 * by scanning the list.
1366 struct list_head *i;
1368 __u32 n = (__u32) bucket;
1370 /* yaffs_CheckObjectHashSanity(); */
1374 n += YAFFS_NOBJECT_BUCKETS;
1375 if (1 || dev->objectBucket[bucket].count > 0) {
1376 list_for_each(i, &dev->objectBucket[bucket].list) {
1377 /* If there is already one in the list */
1379 && list_entry(i, yaffs_Object,
1380 hashLink)->objectId == n) {
1391 static void yaffs_HashObject(yaffs_Object * in)
1393 int bucket = yaffs_HashFunction(in->objectId);
1394 yaffs_Device *dev = in->myDev;
1396 list_add(&in->hashLink, &dev->objectBucket[bucket].list);
1397 dev->objectBucket[bucket].count++;
1401 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
1403 int bucket = yaffs_HashFunction(number);
1404 struct list_head *i;
1407 list_for_each(i, &dev->objectBucket[bucket].list) {
1408 /* Look if it is in the list */
1410 in = list_entry(i, yaffs_Object, hashLink);
1411 if (in->objectId == number) {
1413 /* Don't tell the VFS about this one if it is defered free */
1414 if (in->deferedFree)
1426 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
1427 yaffs_ObjectType type)
1430 yaffs_Object *theObject;
1433 number = yaffs_CreateNewObjectNumber(dev);
1436 theObject = yaffs_AllocateEmptyObject(dev);
1439 theObject->fake = 0;
1440 theObject->renameAllowed = 1;
1441 theObject->unlinkAllowed = 1;
1442 theObject->objectId = number;
1443 yaffs_HashObject(theObject);
1444 theObject->variantType = type;
1445 #ifdef CONFIG_YAFFS_WINCE
1446 yfsd_WinFileTimeNow(theObject->win_atime);
1447 theObject->win_ctime[0] = theObject->win_mtime[0] =
1448 theObject->win_atime[0];
1449 theObject->win_ctime[1] = theObject->win_mtime[1] =
1450 theObject->win_atime[1];
1454 theObject->yst_atime = theObject->yst_mtime =
1455 theObject->yst_ctime = Y_CURRENT_TIME;
1458 case YAFFS_OBJECT_TYPE_FILE:
1459 theObject->variant.fileVariant.fileSize = 0;
1460 theObject->variant.fileVariant.scannedFileSize = 0;
1461 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
1462 theObject->variant.fileVariant.topLevel = 0;
1463 theObject->variant.fileVariant.top =
1464 yaffs_GetTnode(dev);
1466 case YAFFS_OBJECT_TYPE_DIRECTORY:
1467 INIT_LIST_HEAD(&theObject->variant.directoryVariant.
1470 case YAFFS_OBJECT_TYPE_SYMLINK:
1471 case YAFFS_OBJECT_TYPE_HARDLINK:
1472 case YAFFS_OBJECT_TYPE_SPECIAL:
1473 /* No action required */
1475 case YAFFS_OBJECT_TYPE_UNKNOWN:
1476 /* todo this should not happen */
1484 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
1486 yaffs_ObjectType type)
1488 yaffs_Object *theObject = NULL;
1491 theObject = yaffs_FindObjectByNumber(dev, number);
1495 theObject = yaffs_CreateNewObject(dev, number, type);
1503 static YCHAR *yaffs_CloneString(const YCHAR * str)
1505 YCHAR *newStr = NULL;
1508 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
1509 yaffs_strcpy(newStr, str);
1517 * Mknod (create) a new object.
1518 * equivalentObject only has meaning for a hard link;
1519 * aliasString only has meaning for a sumlink.
1520 * rdev only has meaning for devices (a subset of special objects)
1523 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
1524 yaffs_Object * parent,
1529 yaffs_Object * equivalentObject,
1530 const YCHAR * aliasString, __u32 rdev)
1534 yaffs_Device *dev = parent->myDev;
1536 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
1537 if (yaffs_FindObjectByName(parent, name)) {
1541 in = yaffs_CreateNewObject(dev, -1, type);
1546 in->variantType = type;
1548 in->yst_mode = mode;
1550 #ifdef CONFIG_YAFFS_WINCE
1551 yfsd_WinFileTimeNow(in->win_atime);
1552 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1553 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1556 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1558 in->yst_rdev = rdev;
1562 in->nDataChunks = 0;
1564 yaffs_SetObjectName(in, name);
1567 yaffs_AddObjectToDirectory(parent, in);
1569 in->myDev = parent->myDev;
1572 case YAFFS_OBJECT_TYPE_SYMLINK:
1573 in->variant.symLinkVariant.alias =
1574 yaffs_CloneString(aliasString);
1576 case YAFFS_OBJECT_TYPE_HARDLINK:
1577 in->variant.hardLinkVariant.equivalentObject =
1579 in->variant.hardLinkVariant.equivalentObjectId =
1580 equivalentObject->objectId;
1581 list_add(&in->hardLinks, &equivalentObject->hardLinks);
1583 case YAFFS_OBJECT_TYPE_FILE:
1584 case YAFFS_OBJECT_TYPE_DIRECTORY:
1585 case YAFFS_OBJECT_TYPE_SPECIAL:
1586 case YAFFS_OBJECT_TYPE_UNKNOWN:
1591 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
1592 /* Could not create the object header, fail the creation */
1593 yaffs_DestroyObject(in);
1602 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
1603 __u32 mode, __u32 uid, __u32 gid)
1605 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1606 uid, gid, NULL, NULL, 0);
1609 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
1610 __u32 mode, __u32 uid, __u32 gid)
1612 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1613 mode, uid, gid, NULL, NULL, 0);
1616 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
1617 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1619 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1620 uid, gid, NULL, NULL, rdev);
1623 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
1624 __u32 mode, __u32 uid, __u32 gid,
1625 const YCHAR * alias)
1627 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1628 uid, gid, NULL, alias, 0);
1631 /* yaffs_Link returns the object id of the equivalent object.*/
1632 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
1633 yaffs_Object * equivalentObject)
1635 /* Get the real object in case we were fed a hard link as an equivalent object */
1636 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1638 if (yaffs_MknodObject
1639 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1640 equivalentObject, NULL, 0)) {
1641 return equivalentObject;
1648 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
1649 const YCHAR * newName, int force, int shadows)
1654 yaffs_Object *existingTarget;
1656 if (newDir == NULL) {
1657 newDir = obj->parent; /* use the old directory */
1660 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
1661 T(YAFFS_TRACE_ALWAYS,
1663 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
1668 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1669 if (obj->myDev->isYaffs2) {
1670 unlinkOp = (newDir == obj->myDev->unlinkedDir);
1672 unlinkOp = (newDir == obj->myDev->unlinkedDir
1673 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1676 deleteOp = (newDir == obj->myDev->deletedDir);
1678 existingTarget = yaffs_FindObjectByName(newDir, newName);
1680 /* If the object is a file going into the unlinked directory,
1681 * then it is OK to just stuff it in since duplicate names are allowed.
1682 * else only proceed if the new name does not exist and if we're putting
1683 * it into a directory.
1690 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
1691 yaffs_SetObjectName(obj, newName);
1694 yaffs_AddObjectToDirectory(newDir, obj);
1699 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1700 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
1707 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
1708 yaffs_Object * newDir, const YCHAR * newName)
1711 yaffs_Object *existingTarget;
1714 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1715 /* Special case for case insemsitive systems (eg. WinCE).
1716 * While look-up is case insensitive, the name isn't.
1717 * Therefore we might want to change x.txt to X.txt
1719 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
1724 obj = yaffs_FindObjectByName(oldDir, oldName);
1726 if (obj && obj->renameAllowed) {
1728 /* Now do the handling for an existing target, if there is one */
1730 existingTarget = yaffs_FindObjectByName(newDir, newName);
1731 if (existingTarget &&
1732 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1733 !list_empty(&existingTarget->variant.directoryVariant.children)) {
1734 /* There is a target that is a non-empty directory, so we fail */
1735 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
1736 } else if (existingTarget && existingTarget != obj) {
1737 /* Nuke the target first, using shadowing,
1738 * but only if it isn't the same object
1740 yaffs_ChangeObjectName(obj, newDir, newName, force,
1741 existingTarget->objectId);
1742 yaffs_UnlinkObject(existingTarget);
1745 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
1750 /*------------------------- Block Management and Page Allocation ----------------*/
1752 static int yaffs_InitialiseBlocks(yaffs_Device * dev)
1754 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
1756 dev->allocationBlock = -1; /* force it to get a new one */
1758 /* Todo we're assuming the malloc will pass. */
1759 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
1760 if(!dev->blockInfo){
1761 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
1762 dev->blockInfoAlt = 1;
1765 dev->blockInfoAlt = 0;
1767 /* Set up dynamic blockinfo stuff. */
1768 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; // round up bytes
1769 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
1770 if(!dev->chunkBits){
1771 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
1772 dev->chunkBitsAlt = 1;
1775 dev->chunkBitsAlt = 0;
1777 if (dev->blockInfo && dev->chunkBits) {
1778 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
1779 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
1787 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
1789 if(dev->blockInfoAlt)
1790 YFREE_ALT(dev->blockInfo);
1792 YFREE(dev->blockInfo);
1793 dev->blockInfoAlt = 0;
1795 dev->blockInfo = NULL;
1797 if(dev->chunkBitsAlt)
1798 YFREE_ALT(dev->chunkBits);
1800 YFREE(dev->chunkBits);
1801 dev->chunkBitsAlt = 0;
1802 dev->chunkBits = NULL;
1805 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
1806 yaffs_BlockInfo * bi)
1813 return 1; /* disqualification only applies to yaffs2. */
1815 if (!bi->hasShrinkHeader)
1816 return 1; /* can gc */
1818 /* Find the oldest dirty sequence number if we don't know it and save it
1819 * so we don't have to keep recomputing it.
1821 if (!dev->oldestDirtySequence) {
1822 seq = dev->sequenceNumber;
1824 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
1826 b = yaffs_GetBlockInfo(dev, i);
1827 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1828 (b->pagesInUse - b->softDeletions) <
1829 dev->nChunksPerBlock && b->sequenceNumber < seq) {
1830 seq = b->sequenceNumber;
1833 dev->oldestDirtySequence = seq;
1836 /* Can't do gc of this block if there are any blocks older than this one that have
1839 return (bi->sequenceNumber <= dev->oldestDirtySequence);
1845 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
1846 * for garbage collection.
1849 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
1853 int b = dev->currentDirtyChecker;
1859 yaffs_BlockInfo *bi;
1860 static int nonAggressiveSkip = 0;
1862 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
1864 * else (we're doing a leasurely gc), then we only bother to do this if the
1865 * block has only a few pages in use.
1868 nonAggressiveSkip--;
1870 if (!aggressive && (nonAggressiveSkip > 0)) {
1875 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
1879 dev->internalEndBlock - dev->internalStartBlock + 1;
1882 dev->internalEndBlock - dev->internalStartBlock + 1;
1883 iterations = iterations / 16;
1884 if (iterations > 200) {
1889 for (i = 0; i <= iterations && pagesInUse > 0; i++) {
1891 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1892 b = dev->internalStartBlock;
1895 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1896 T(YAFFS_TRACE_ERROR,
1897 (TSTR("**>> Block %d is not valid" TENDSTR), b));
1901 bi = yaffs_GetBlockInfo(dev, b);
1904 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
1911 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
1912 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
1913 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
1915 pagesInUse = (bi->pagesInUse - bi->softDeletions);
1919 dev->currentDirtyChecker = b;
1923 (TSTR("GC Selected block %d with %d free" TENDSTR), dirtiest,
1924 dev->nChunksPerBlock - pagesInUse));
1927 dev->oldestDirtySequence = 0;
1930 nonAggressiveSkip = 4;
1936 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
1938 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
1942 /* If the block is still healthy erase it and mark as clean.
1943 * If the block has had a data failure, then retire it.
1945 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
1947 if (!bi->needsRetiring) {
1948 yaffs_InvalidateCheckpoint(dev);
1949 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
1951 dev->nErasureFailures++;
1952 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1953 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
1957 if (erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE)) {
1959 for (i = 0; i < dev->nChunksPerBlock; i++) {
1960 if (!yaffs_CheckChunkErased
1961 (dev, blockNo * dev->nChunksPerBlock + i)) {
1962 T(YAFFS_TRACE_ERROR,
1964 (">>Block %d erasure supposedly OK, but chunk %d not erased"
1965 TENDSTR), blockNo, i));
1971 /* Clean it up... */
1972 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
1973 dev->nErasedBlocks++;
1975 bi->softDeletions = 0;
1976 bi->hasShrinkHeader = 0;
1977 yaffs_ClearChunkBits(dev, blockNo);
1979 T(YAFFS_TRACE_ERASE,
1980 (TSTR("Erased block %d" TENDSTR), blockNo));
1982 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
1984 yaffs_RetireBlock(dev, blockNo);
1985 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1986 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
1990 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
1994 yaffs_BlockInfo *bi;
1996 if (dev->nErasedBlocks < 1) {
1997 /* Hoosterman we've got a problem.
1998 * Can't get space to gc
2000 T(YAFFS_TRACE_ERROR,
2001 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2006 /* Find an empty block. */
2008 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2009 dev->allocationBlockFinder++;
2010 if (dev->allocationBlockFinder < dev->internalStartBlock
2011 || dev->allocationBlockFinder > dev->internalEndBlock) {
2012 dev->allocationBlockFinder = dev->internalStartBlock;
2015 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2017 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2018 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2019 dev->sequenceNumber++;
2020 bi->sequenceNumber = dev->sequenceNumber;
2021 dev->nErasedBlocks--;
2022 T(YAFFS_TRACE_ALLOCATE,
2023 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2024 dev->allocationBlockFinder, dev->sequenceNumber,
2025 dev->nErasedBlocks));
2026 return dev->allocationBlockFinder;
2030 T(YAFFS_TRACE_ALWAYS,
2032 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2033 TENDSTR), dev->nErasedBlocks));
2039 // Check if there's space to allocate...
2040 // Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2041 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2044 int reservedBlocks = dev->nReservedBlocks;
2045 int checkpointBlocks;
2047 checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
2048 if(checkpointBlocks < 0)
2049 checkpointBlocks = 0;
2051 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2053 return (dev->nFreeChunks > reservedChunks);
2056 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve)
2059 yaffs_BlockInfo *bi;
2061 if (dev->allocationBlock < 0) {
2062 /* Get next block to allocate off */
2063 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2064 dev->allocationPage = 0;
2067 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2068 /* Not enough space to allocate unless we're allowed to use the reserve. */
2072 if (dev->nErasedBlocks < dev->nReservedBlocks
2073 && dev->allocationPage == 0) {
2074 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2077 /* Next page please.... */
2078 if (dev->allocationBlock >= 0) {
2079 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2081 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2082 dev->allocationPage;
2084 yaffs_SetChunkBit(dev, dev->allocationBlock,
2085 dev->allocationPage);
2087 dev->allocationPage++;
2091 /* If the block is full set the state to full */
2092 if (dev->allocationPage >= dev->nChunksPerBlock) {
2093 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2094 dev->allocationBlock = -1;
2100 T(YAFFS_TRACE_ERROR,
2101 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2106 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2110 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2112 if (dev->allocationBlock > 0) {
2113 n += (dev->nChunksPerBlock - dev->allocationPage);
2120 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2126 int retVal = YAFFS_OK;
2129 int isCheckpointBlock;
2131 int chunksBefore = yaffs_GetErasedChunks(dev);
2134 yaffs_ExtendedTags tags;
2136 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2138 yaffs_Object *object;
2140 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2142 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2144 T(YAFFS_TRACE_TRACING,
2145 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2146 bi->pagesInUse, bi->hasShrinkHeader));
2148 /*yaffs_VerifyFreeChunks(dev); */
2150 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2152 /* Take off the number of soft deleted entries because
2153 * they're going to get really deleted during GC.
2155 dev->nFreeChunks -= bi->softDeletions;
2159 if (isCheckpointBlock ||
2160 !yaffs_StillSomeChunkBits(dev, block)) {
2161 T(YAFFS_TRACE_TRACING,
2163 ("Collecting block %d that has no chunks in use" TENDSTR),
2165 yaffs_BlockBecameDirty(dev, block);
2168 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2170 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2171 chunkInBlock < dev->nChunksPerBlock
2172 && yaffs_StillSomeChunkBits(dev, block);
2173 chunkInBlock++, oldChunk++) {
2174 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2176 /* This page is in use and might need to be copied off */
2180 yaffs_InitialiseTags(&tags);
2182 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2186 yaffs_FindObjectByNumber(dev,
2189 T(YAFFS_TRACE_GC_DETAIL,
2191 ("Collecting page %d, %d %d %d " TENDSTR),
2192 chunkInBlock, tags.objectId, tags.chunkId,
2196 T(YAFFS_TRACE_ERROR,
2198 ("page %d in gc has no object "
2199 TENDSTR), oldChunk));
2202 if (object && object->deleted
2203 && tags.chunkId != 0) {
2204 /* Data chunk in a deleted file, throw it away
2205 * It's a soft deleted data chunk,
2206 * No need to copy this, just forget about it and
2207 * fix up the object.
2210 object->nDataChunks--;
2212 if (object->nDataChunks <= 0) {
2213 /* remeber to clean up the object */
2214 dev->gcCleanupList[cleanups] =
2220 /* Todo object && object->deleted && object->nDataChunks == 0 */
2222 /* Deleted object header with no data chunks.
2223 * Can be discarded and the file deleted.
2225 object->chunkId = 0;
2226 yaffs_FreeTnode(object->myDev,
2229 object->variant.fileVariant.top = NULL;
2230 yaffs_DoGenericObjectDeletion(object);
2232 } else if (object) {
2233 /* It's either a data chunk in a live file or
2234 * an ObjectHeader, so we're interested in it.
2235 * NB Need to keep the ObjectHeaders of deleted files
2236 * until the whole file has been deleted off
2238 tags.serialNumber++;
2242 if (tags.chunkId == 0) {
2243 /* It is an object Id,
2244 * We need to nuke the shrinkheader flags first
2245 * We no longer want the shrinkHeader flag since its work is done
2246 * and if it is left in place it will mess up scanning.
2247 * Also, clear out any shadowing stuff
2250 yaffs_ObjectHeader *oh;
2251 oh = (yaffs_ObjectHeader *)buffer;
2253 oh->shadowsObject = -1;
2254 tags.extraShadows = 0;
2255 tags.extraIsShrinkHeader = 0;
2259 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2262 retVal = YAFFS_FAIL;
2265 /* Ok, now fix up the Tnodes etc. */
2267 if (tags.chunkId == 0) {
2269 object->chunkId = newChunk;
2270 object->serial = tags.serialNumber;
2272 /* It's a data chunk */
2273 yaffs_PutChunkIntoFile
2281 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2286 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2289 /* Do any required cleanups */
2290 for (i = 0; i < cleanups; i++) {
2291 /* Time to delete the file too */
2293 yaffs_FindObjectByNumber(dev,
2294 dev->gcCleanupList[i]);
2296 yaffs_FreeTnode(dev,
2297 object->variant.fileVariant.
2299 object->variant.fileVariant.top = NULL;
2302 ("yaffs: About to finally delete object %d"
2303 TENDSTR), object->objectId));
2304 yaffs_DoGenericObjectDeletion(object);
2305 object->myDev->nDeletedFiles--;
2312 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
2315 ("gc did not increase free chunks before %d after %d"
2316 TENDSTR), chunksBefore, chunksAfter));
2324 /* New garbage collector
2325 * If we're very low on erased blocks then we do aggressive garbage collection
2326 * otherwise we do "leasurely" garbage collection.
2327 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2328 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2330 * The idea is to help clear out space in a more spread-out manner.
2331 * Dunno if it really does anything useful.
2333 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
2337 int gcOk = YAFFS_OK;
2340 if (dev->isDoingGC) {
2341 /* Bail out so we don't get recursive gc */
2345 /* This loop should pass the first time.
2346 * We'll only see looping here if the erase of the collected block fails.
2351 if (dev->nErasedBlocks < dev->nReservedBlocks) {
2352 /* We need a block soon...*/
2355 /* We're in no hurry */
2359 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
2362 dev->garbageCollections++;
2364 dev->passiveGarbageCollections++;
2369 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
2370 dev->nErasedBlocks, aggressive));
2372 gcOk = yaffs_GarbageCollectBlock(dev, block);
2375 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
2378 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
2379 TENDSTR), dev->nErasedBlocks, maxTries, block));
2381 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
2384 return aggressive ? gcOk : YAFFS_OK;
2387 /*------------------------- TAGS --------------------------------*/
2389 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
2392 return (tags->chunkId == chunkInObject &&
2393 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
2398 /*-------------------- Data file manipulation -----------------*/
2400 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
2401 yaffs_ExtendedTags * tags)
2403 /*Get the Tnode, then get the level 0 offset chunk offset */
2406 yaffs_ExtendedTags localTags;
2409 yaffs_Device *dev = in->myDev;
2412 /* Passed a NULL, so use our own tags space */
2416 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2419 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2422 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2428 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
2429 yaffs_ExtendedTags * tags)
2431 /* Get the Tnode, then get the level 0 offset chunk offset */
2434 yaffs_ExtendedTags localTags;
2436 yaffs_Device *dev = in->myDev;
2440 /* Passed a NULL, so use our own tags space */
2444 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2448 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2451 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2454 /* Delete the entry in the filestructure (if found) */
2456 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
2459 /*T(("No level 0 found for %d\n", chunkInInode)); */
2463 /* T(("Could not find %d to delete\n",chunkInInode)); */
2468 #ifdef YAFFS_PARANOID
2470 static int yaffs_CheckFileSanity(yaffs_Object * in)
2478 yaffs_Tags localTags;
2479 yaffs_Tags *tags = &localTags;
2483 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2484 /* T(("Object not a file\n")); */
2488 objId = in->objectId;
2489 fSize = in->variant.fileVariant.fileSize;
2491 (fSize + in->myDev->nBytesPerChunk - 1) / in->myDev->nBytesPerChunk;
2493 for (chunk = 1; chunk <= nChunks; chunk++) {
2494 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
2499 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
2501 if (yaffs_CheckChunkBits
2502 (dev, theChunk / dev->nChunksPerBlock,
2503 theChunk % dev->nChunksPerBlock)) {
2505 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
2509 (tags, in->objectId, chunk, chunkDeleted)) {
2519 /* T(("No level 0 found for %d\n", chunk)); */
2523 return failed ? YAFFS_FAIL : YAFFS_OK;
2528 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
2529 int chunkInNAND, int inScan)
2531 /* NB inScan is zero unless scanning.
2532 * For forward scanning, inScan is > 0;
2533 * for backward scanning inScan is < 0
2537 yaffs_Device *dev = in->myDev;
2539 yaffs_ExtendedTags existingTags;
2540 yaffs_ExtendedTags newTags;
2541 unsigned existingSerial, newSerial;
2543 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2544 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2545 * If it is not during Scanning then something went wrong!
2548 T(YAFFS_TRACE_ERROR,
2550 ("yaffs tragedy:attempt to put data chunk into a non-file"
2555 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
2559 tn = yaffs_AddOrFindLevel0Tnode(dev,
2560 &in->variant.fileVariant,
2567 existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2570 /* If we're scanning then we need to test for duplicates
2571 * NB This does not need to be efficient since it should only ever
2572 * happen when the power fails during a write, then only one
2573 * chunk should ever be affected.
2575 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2576 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2579 if (existingChunk != 0) {
2580 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
2581 * thus we have to do a FindChunkInFile to get the real chunk id.
2583 * We have a duplicate now we need to decide which one to use:
2585 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2586 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2587 * YAFFS1: Get both sets of tags and compare serial numbers.
2591 /* Only do this for forward scanning */
2592 yaffs_ReadChunkWithTagsFromNAND(dev,
2596 /* Do a proper find */
2598 yaffs_FindChunkInFile(in, chunkInInode,
2602 if (existingChunk <= 0) {
2603 /*Hoosterman - how did this happen? */
2605 T(YAFFS_TRACE_ERROR,
2607 ("yaffs tragedy: existing chunk < 0 in scan"
2612 /* NB The deleted flags should be false, otherwise the chunks will
2613 * not be loaded during a scan
2616 newSerial = newTags.serialNumber;
2617 existingSerial = existingTags.serialNumber;
2620 (in->myDev->isYaffs2 ||
2621 existingChunk <= 0 ||
2622 ((existingSerial + 1) & 3) == newSerial)) {
2623 /* Forward scanning.
2625 * Delete the old one and drop through to update the tnode
2627 yaffs_DeleteChunk(dev, existingChunk, 1,
2630 /* Backward scanning or we want to use the existing one
2632 * Delete the new one and return early so that the tnode isn't changed
2634 yaffs_DeleteChunk(dev, chunkInNAND, 1,
2642 if (existingChunk == 0) {
2646 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
2651 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
2654 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
2656 if (chunkInNAND >= 0) {
2657 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
2660 T(YAFFS_TRACE_NANDACCESS,
2661 (TSTR("Chunk %d not found zero instead" TENDSTR),
2663 /* get sane (zero) data if you read a hole */
2664 memset(buffer, 0, in->myDev->nBytesPerChunk);
2670 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
2674 yaffs_ExtendedTags tags;
2675 yaffs_BlockInfo *bi;
2681 block = chunkId / dev->nChunksPerBlock;
2682 page = chunkId % dev->nChunksPerBlock;
2684 bi = yaffs_GetBlockInfo(dev, block);
2686 T(YAFFS_TRACE_DELETION,
2687 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
2690 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
2692 yaffs_InitialiseTags(&tags);
2694 tags.chunkDeleted = 1;
2696 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
2697 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
2699 dev->nUnmarkedDeletions++;
2702 /* Pull out of the management area.
2703 * If the whole block became dirty, this will kick off an erasure.
2705 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2706 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
2707 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2708 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
2711 yaffs_ClearChunkBit(dev, block, page);
2715 if (bi->pagesInUse == 0 &&
2716 !bi->hasShrinkHeader &&
2717 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
2718 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2719 yaffs_BlockBecameDirty(dev, block);
2723 /* T(("Bad news deleting chunk %d\n",chunkId)); */
2728 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
2729 const __u8 * buffer, int nBytes,
2732 /* Find old chunk Need to do this to get serial number
2733 * Write new one and patch into tree.
2734 * Invalidate old tags.
2738 yaffs_ExtendedTags prevTags;
2741 yaffs_ExtendedTags newTags;
2743 yaffs_Device *dev = in->myDev;
2745 yaffs_CheckGarbageCollection(dev);
2747 /* Get the previous chunk at this location in the file if it exists */
2748 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
2750 /* Set up new tags */
2751 yaffs_InitialiseTags(&newTags);
2753 newTags.chunkId = chunkInInode;
2754 newTags.objectId = in->objectId;
2755 newTags.serialNumber =
2756 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
2757 newTags.byteCount = nBytes;
2760 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2763 if (newChunkId >= 0) {
2764 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
2766 if (prevChunkId >= 0) {
2767 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
2771 yaffs_CheckFileSanity(in);
2777 /* UpdateObjectHeader updates the header on NAND for an object.
2778 * If name is not NULL, then that new name is used.
2780 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
2781 int isShrink, int shadows)
2784 yaffs_BlockInfo *bi;
2786 yaffs_Device *dev = in->myDev;
2792 yaffs_ExtendedTags newTags;
2794 __u8 *buffer = NULL;
2795 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
2797 yaffs_ObjectHeader *oh = NULL;
2799 if (!in->fake || force) {
2801 yaffs_CheckGarbageCollection(dev);
2803 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
2804 oh = (yaffs_ObjectHeader *) buffer;
2806 prevChunkId = in->chunkId;
2808 if (prevChunkId >= 0) {
2809 yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
2811 memcpy(oldName, oh->name, sizeof(oh->name));
2814 memset(buffer, 0xFF, dev->nBytesPerChunk);
2816 oh->type = in->variantType;
2817 oh->yst_mode = in->yst_mode;
2818 oh->shadowsObject = shadows;
2820 #ifdef CONFIG_YAFFS_WINCE
2821 oh->win_atime[0] = in->win_atime[0];
2822 oh->win_ctime[0] = in->win_ctime[0];
2823 oh->win_mtime[0] = in->win_mtime[0];
2824 oh->win_atime[1] = in->win_atime[1];
2825 oh->win_ctime[1] = in->win_ctime[1];
2826 oh->win_mtime[1] = in->win_mtime[1];
2828 oh->yst_uid = in->yst_uid;
2829 oh->yst_gid = in->yst_gid;
2830 oh->yst_atime = in->yst_atime;
2831 oh->yst_mtime = in->yst_mtime;
2832 oh->yst_ctime = in->yst_ctime;
2833 oh->yst_rdev = in->yst_rdev;
2836 oh->parentObjectId = in->parent->objectId;
2838 oh->parentObjectId = 0;
2841 if (name && *name) {
2842 memset(oh->name, 0, sizeof(oh->name));
2843 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
2844 } else if (prevChunkId) {
2845 memcpy(oh->name, oldName, sizeof(oh->name));
2847 memset(oh->name, 0, sizeof(oh->name));
2850 oh->isShrink = isShrink;
2852 switch (in->variantType) {
2853 case YAFFS_OBJECT_TYPE_UNKNOWN:
2854 /* Should not happen */
2856 case YAFFS_OBJECT_TYPE_FILE:
2858 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
2859 || oh->parentObjectId ==
2860 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
2861 fileVariant.fileSize;
2863 case YAFFS_OBJECT_TYPE_HARDLINK:
2864 oh->equivalentObjectId =
2865 in->variant.hardLinkVariant.equivalentObjectId;
2867 case YAFFS_OBJECT_TYPE_SPECIAL:
2870 case YAFFS_OBJECT_TYPE_DIRECTORY:
2873 case YAFFS_OBJECT_TYPE_SYMLINK:
2874 yaffs_strncpy(oh->alias,
2875 in->variant.symLinkVariant.alias,
2876 YAFFS_MAX_ALIAS_LENGTH);
2877 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
2882 yaffs_InitialiseTags(&newTags);
2884 newTags.chunkId = 0;
2885 newTags.objectId = in->objectId;
2886 newTags.serialNumber = in->serial;
2888 /* Add extra info for file header */
2890 newTags.extraHeaderInfoAvailable = 1;
2891 newTags.extraParentObjectId = oh->parentObjectId;
2892 newTags.extraFileLength = oh->fileSize;
2893 newTags.extraIsShrinkHeader = oh->isShrink;
2894 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
2895 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
2896 newTags.extraObjectType = in->variantType;
2898 /* Create new chunk in NAND */
2900 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2901 (prevChunkId >= 0) ? 1 : 0);
2903 if (newChunkId >= 0) {
2905 in->chunkId = newChunkId;
2907 if (prevChunkId >= 0) {
2908 yaffs_DeleteChunk(dev, prevChunkId, 1,
2914 /* If this was a shrink, then mark the block that the chunk lives on */
2916 bi = yaffs_GetBlockInfo(in->myDev,
2917 newChunkId /in->myDev-> nChunksPerBlock);
2918 bi->hasShrinkHeader = 1;
2923 retVal = newChunkId;
2928 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2933 /*------------------------ Short Operations Cache ----------------------------------------
2934 * In many situations where there is no high level buffering (eg WinCE) a lot of
2935 * reads might be short sequential reads, and a lot of writes may be short
2936 * sequential writes. eg. scanning/writing a jpeg file.
2937 * In these cases, a short read/write cache can provide a huge perfomance benefit
2938 * with dumb-as-a-rock code.
2939 * In Linux, the page cache provides read buffering aand the short op cache provides write
2942 * There are a limited number (~10) of cache chunks per device so that we don't
2943 * need a very intelligent search.
2946 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
2948 yaffs_Device *dev = obj->myDev;
2949 int lowest = -99; /* Stop compiler whining. */
2951 yaffs_ChunkCache *cache;
2952 int chunkWritten = 0;
2953 int nCaches = obj->myDev->nShortOpCaches;
2959 /* Find the dirty cache for this object with the lowest chunk id. */
2960 for (i = 0; i < nCaches; i++) {
2961 if (dev->srCache[i].object == obj &&
2962 dev->srCache[i].dirty) {
2964 || dev->srCache[i].chunkId <
2966 cache = &dev->srCache[i];
2967 lowest = cache->chunkId;
2972 if (cache && !cache->locked) {
2973 /* Write it out and free it up */
2976 yaffs_WriteChunkDataToObject(cache->object,
2982 cache->object = NULL;
2985 } while (cache && chunkWritten > 0);
2988 /* Hoosterman, disk full while writing cache out. */
2989 T(YAFFS_TRACE_ERROR,
2990 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
2997 /*yaffs_FlushEntireDeviceCache(dev)
3002 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3005 int nCaches = dev->nShortOpCaches;
3008 /* Find a dirty object in the cache and flush it...
3009 * until there are no further dirty objects.
3013 for( i = 0; i < nCaches && !obj; i++) {
3014 if (dev->srCache[i].object &&
3015 dev->srCache[i].dirty)
3016 obj = dev->srCache[i].object;
3020 yaffs_FlushFilesChunkCache(obj);
3027 /* Grab us a cache chunk for use.
3028 * First look for an empty one.
3029 * Then look for the least recently used non-dirty one.
3030 * Then look for the least recently used dirty one...., flush and look again.
3032 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3038 if (dev->nShortOpCaches > 0) {
3039 for (i = 0; i < dev->nShortOpCaches; i++) {
3040 if (!dev->srCache[i].object)
3041 return &dev->srCache[i];
3047 usage = 0; /* just to stop the compiler grizzling */
3049 for (i = 0; i < dev->nShortOpCaches; i++) {
3050 if (!dev->srCache[i].dirty &&
3051 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3053 usage = dev->srCache[i].lastUse;
3059 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3066 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3068 yaffs_ChunkCache *cache;
3069 yaffs_Object *theObj;
3074 if (dev->nShortOpCaches > 0) {
3075 /* Try find a non-dirty one... */
3077 cache = yaffs_GrabChunkCacheWorker(dev);
3080 /* They were all dirty, find the last recently used object and flush
3081 * its cache, then find again.
3082 * NB what's here is not very accurate, we actually flush the object
3083 * the last recently used page.
3086 /* With locking we can't assume we can use entry zero */
3093 for (i = 0; i < dev->nShortOpCaches; i++) {
3094 if (dev->srCache[i].object &&
3095 !dev->srCache[i].locked &&
3096 (dev->srCache[i].lastUse < usage || !cache))
3098 usage = dev->srCache[i].lastUse;
3099 theObj = dev->srCache[i].object;
3100 cache = &dev->srCache[i];
3105 if (!cache || cache->dirty) {
3106 /* Flush and try again */
3107 yaffs_FlushFilesChunkCache(theObj);
3108 cache = yaffs_GrabChunkCacheWorker(dev);
3118 /* Find a cached chunk */
3119 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3122 yaffs_Device *dev = obj->myDev;
3124 if (dev->nShortOpCaches > 0) {
3125 for (i = 0; i < dev->nShortOpCaches; i++) {
3126 if (dev->srCache[i].object == obj &&
3127 dev->srCache[i].chunkId == chunkId) {
3130 return &dev->srCache[i];
3137 /* Mark the chunk for the least recently used algorithym */
3138 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3142 if (dev->nShortOpCaches > 0) {
3143 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3144 /* Reset the cache usages */
3146 for (i = 1; i < dev->nShortOpCaches; i++) {
3147 dev->srCache[i].lastUse = 0;
3154 cache->lastUse = dev->srLastUse;
3162 /* Invalidate a single cache page.
3163 * Do this when a whole page gets written,
3164 * ie the short cache for this page is no longer valid.
3166 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
3168 if (object->myDev->nShortOpCaches > 0) {
3169 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3172 cache->object = NULL;
3177 /* Invalidate all the cache pages associated with this object
3178 * Do this whenever ther file is deleted or resized.
3180 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
3183 yaffs_Device *dev = in->myDev;
3185 if (dev->nShortOpCaches > 0) {
3186 /* Invalidate it. */
3187 for (i = 0; i < dev->nShortOpCaches; i++) {
3188 if (dev->srCache[i].object == in) {
3189 dev->srCache[i].object = NULL;
3195 /*--------------------- Checkpointing --------------------*/
3198 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
3200 yaffs_CheckpointValidity cp;
3201 cp.structType = sizeof(cp);
3202 cp.magic = YAFFS_MAGIC;
3204 cp.head = (head) ? 1 : 0;
3206 return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
3210 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
3212 yaffs_CheckpointValidity cp;
3215 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3218 ok = (cp.structType == sizeof(cp)) &&
3219 (cp.magic == YAFFS_MAGIC) &&
3220 (cp.version == 1) &&
3221 (cp.head == ((head) ? 1 : 0));
3225 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
3228 cp->nErasedBlocks = dev->nErasedBlocks;
3229 cp->allocationBlock = dev->allocationBlock;
3230 cp->allocationPage = dev->allocationPage;
3231 cp->nFreeChunks = dev->nFreeChunks;
3233 cp->nDeletedFiles = dev->nDeletedFiles;
3234 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
3235 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
3236 cp->sequenceNumber = dev->sequenceNumber;
3237 cp->oldestDirtySequence = dev->oldestDirtySequence;
3241 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
3242 yaffs_CheckpointDevice *cp)
3244 dev->nErasedBlocks = cp->nErasedBlocks;
3245 dev->allocationBlock = cp->allocationBlock;
3246 dev->allocationPage = cp->allocationPage;
3247 dev->nFreeChunks = cp->nFreeChunks;
3249 dev->nDeletedFiles = cp->nDeletedFiles;
3250 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
3251 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
3252 dev->sequenceNumber = cp->sequenceNumber;
3253 dev->oldestDirtySequence = cp->oldestDirtySequence;
3257 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
3259 yaffs_CheckpointDevice cp;
3261 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3265 /* Write device runtime values*/
3266 yaffs_DeviceToCheckpointDevice(&cp,dev);
3267 cp.structType = sizeof(cp);
3269 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3271 /* Write block info */
3273 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3274 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
3277 /* Write chunk bits */
3279 nBytes = nBlocks * dev->chunkBitmapStride;
3280 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
3286 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
3288 yaffs_CheckpointDevice cp;
3290 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3294 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3298 if(cp.structType != sizeof(cp))
3302 yaffs_CheckpointDeviceToDevice(dev,&cp);
3304 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3306 ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
3310 nBytes = nBlocks * dev->chunkBitmapStride;
3312 ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
3317 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
3321 cp->objectId = obj->objectId;
3322 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
3323 cp->chunkId = obj->chunkId;
3324 cp->variantType = obj->variantType;
3325 cp->deleted = obj->deleted;
3326 cp->softDeleted = obj->softDeleted;
3327 cp->unlinked = obj->unlinked;
3328 cp->fake = obj->fake;
3329 cp->renameAllowed = obj->renameAllowed;
3330 cp->unlinkAllowed = obj->unlinkAllowed;
3331 cp->serial = obj->serial;
3332 cp->nDataChunks = obj->nDataChunks;
3334 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
3335 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
3336 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3337 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
3340 static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
3343 yaffs_Object *parent;
3345 obj->objectId = cp->objectId;
3348 parent = yaffs_FindOrCreateObjectByNumber(
3351 YAFFS_OBJECT_TYPE_DIRECTORY);
3356 yaffs_AddObjectToDirectory(parent, obj);
3358 obj->chunkId = cp->chunkId;
3359 obj->variantType = cp->variantType;
3360 obj->deleted = cp->deleted;
3361 obj->softDeleted = cp->softDeleted;
3362 obj->unlinked = cp->unlinked;
3363 obj->fake = cp->fake;
3364 obj->renameAllowed = cp->renameAllowed;
3365 obj->unlinkAllowed = cp->unlinkAllowed;
3366 obj->serial = cp->serial;
3367 obj->nDataChunks = cp->nDataChunks;
3369 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
3370 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
3371 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3372 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
3374 if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
3375 obj->lazyLoaded = 1;
3380 static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
3381 __u32 level, int chunkOffset)
3384 yaffs_Device *dev = in->myDev;
3389 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++){
3390 if (tn->internal[i]) {
3391 yaffs_CheckpointTnodeWorker(in,
3394 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
3397 } else if (level == 0) {
3398 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
3399 /* printf("write tnode at %d\n",baseOffset); */
3400 yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset));
3401 yaffs_CheckpointWrite(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
3409 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
3411 __u32 endMarker = ~0;
3414 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
3415 ok = yaffs_CheckpointTnodeWorker(obj,
3416 obj->variant.fileVariant.top,
3417 obj->variant.fileVariant.topLevel,
3420 ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
3427 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
3431 yaffs_Device *dev = obj->myDev;
3432 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
3435 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
3437 while(ok && (~baseChunk)){
3438 /* Read level 0 tnode */
3440 /* printf("read tnode at %d\n",baseChunk); */
3441 tn = yaffs_GetTnodeRaw(dev);
3443 ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
3444 (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
3449 ok = yaffs_AddOrFindLevel0Tnode(dev,
3456 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
3464 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
3467 yaffs_CheckpointObject cp;
3470 struct list_head *lh;
3473 /* Iterate through the objects in each hash entry,
3474 * dumping them to the checkpointing stream.
3477 for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
3478 list_for_each(lh, &dev->objectBucket[i].list) {
3480 obj = list_entry(lh, yaffs_Object, hashLink);
3481 if (!obj->deferedFree) {
3482 yaffs_ObjectToCheckpointObject(&cp,obj);
3483 cp.structType = sizeof(cp);
3484 /* printf("Write out object %d type %d\n",obj->objectId,obj->variantType); */
3485 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3487 if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
3488 ok = yaffs_WriteCheckpointTnodes(obj);
3495 /* Dump end of list */
3496 memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
3497 cp.structType = sizeof(cp);
3500 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3505 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
3508 yaffs_CheckpointObject cp;
3511 yaffs_Object *hardList = NULL;
3513 while(ok && !done) {
3514 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3515 if(cp.structType != sizeof(cp)) {
3516 /* printf("structure parsing failed\n"); */
3520 if(ok && cp.objectId == ~0)
3523 /* printf("Read object %d type %d\n",cp.objectId,cp.variantType); */
3524 obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
3526 yaffs_CheckpointObjectToObject(obj,&cp);
3527 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
3528 yaffs_ReadCheckpointTnodes(obj);
3529 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
3530 obj->hardLinks.next =
3531 (struct list_head *)
3541 yaffs_HardlinkFixup(dev,hardList);
3546 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
3551 ok = yaffs_CheckpointOpen(dev,1);
3554 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
3556 ok = yaffs_WriteCheckpointDevice(dev);
3558 ok = yaffs_WriteCheckpointObjects(dev);
3560 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
3562 yaffs_CheckpointClose(dev);
3564 // if(dev->checkpointBytes)
3565 dev->isCheckpointed = 1;
3567 //dev->isCheckpointed = 0;
3569 return dev->isCheckpointed;
3572 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
3576 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
3579 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
3581 ok = yaffs_ReadCheckpointDevice(dev);
3583 ok = yaffs_ReadCheckpointObjects(dev);
3585 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
3589 yaffs_CheckpointClose(dev);
3592 dev->isCheckpointed = 1;
3594 // dev->isCheckpointed = 0;
3600 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
3602 if(dev->isCheckpointed){
3603 dev->isCheckpointed = 0;
3604 yaffs_CheckpointInvalidateStream(dev);
3605 if(dev->superBlock && dev->markSuperBlockDirty)
3606 dev->markSuperBlockDirty(dev->superBlock);
3611 int yaffs_CheckpointSave(yaffs_Device *dev)
3613 if(!dev->isCheckpointed)
3614 yaffs_WriteCheckpointData(dev);
3616 return dev->isCheckpointed;
3619 int yaffs_CheckpointRestore(yaffs_Device *dev)
3622 return yaffs_ReadCheckpointData(dev);
3625 /*--------------------- File read/write ------------------------
3626 * Read and write have very similar structures.
3627 * In general the read/write has three parts to it
3628 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3629 * Some complete chunks
3630 * An incomplete chunk to end off with
3632 * Curve-balls: the first chunk might also be the last chunk.
3635 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, __u32 offset,
3644 yaffs_ChunkCache *cache;
3651 chunk = offset / dev->nBytesPerChunk + 1; /* The first chunk is 1 */
3652 start = offset % dev->nBytesPerChunk;
3654 /* OK now check for the curveball where the start and end are in
3657 if ((start + n) < dev->nBytesPerChunk) {
3660 nToCopy = dev->nBytesPerChunk - start;
3663 cache = yaffs_FindChunkCache(in, chunk);
3665 /* If the chunk is already in the cache or it is less than a whole chunk
3666 * then use the cache (if there is caching)
3667 * else bypass the cache.
3669 if (cache || nToCopy != dev->nBytesPerChunk) {
3670 if (dev->nShortOpCaches > 0) {
3672 /* If we can't find the data in the cache, then load it up. */
3675 cache = yaffs_GrabChunkCache(in->myDev);
3677 cache->chunkId = chunk;
3680 yaffs_ReadChunkDataFromObject(in, chunk,
3686 yaffs_UseChunkCache(dev, cache, 0);
3690 #ifdef CONFIG_YAFFS_WINCE
3691 yfsd_UnlockYAFFS(TRUE);
3693 memcpy(buffer, &cache->data[start], nToCopy);
3695 #ifdef CONFIG_YAFFS_WINCE
3696 yfsd_LockYAFFS(TRUE);
3700 /* Read into the local buffer then copy..*/
3703 yaffs_GetTempBuffer(dev, __LINE__);
3704 yaffs_ReadChunkDataFromObject(in, chunk,
3706 #ifdef CONFIG_YAFFS_WINCE
3707 yfsd_UnlockYAFFS(TRUE);
3709 memcpy(buffer, &localBuffer[start], nToCopy);
3711 #ifdef CONFIG_YAFFS_WINCE
3712 yfsd_LockYAFFS(TRUE);
3714 yaffs_ReleaseTempBuffer(dev, localBuffer,
3719 #ifdef CONFIG_YAFFS_WINCE
3720 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3722 /* Under WinCE can't do direct transfer. Need to use a local buffer.
3723 * This is because we otherwise screw up WinCE's memory mapper
3725 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
3727 #ifdef CONFIG_YAFFS_WINCE
3728 yfsd_UnlockYAFFS(TRUE);
3730 memcpy(buffer, localBuffer, dev->nBytesPerChunk);
3732 #ifdef CONFIG_YAFFS_WINCE
3733 yfsd_LockYAFFS(TRUE);
3734 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3738 /* A full chunk. Read directly into the supplied buffer. */
3739 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
3753 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, __u32 offset,
3754 int nBytes, int writeThrough)
3763 int startOfWrite = offset;
3764 int chunkWritten = 0;
3771 while (n > 0 && chunkWritten >= 0) {
3772 chunk = offset / dev->nBytesPerChunk + 1;
3773 start = offset % dev->nBytesPerChunk;
3775 /* OK now check for the curveball where the start and end are in
3779 if ((start + n) < dev->nBytesPerChunk) {
3782 /* Now folks, to calculate how many bytes to write back....
3783 * If we're overwriting and not writing to then end of file then
3784 * we need to write back as much as was there before.
3788 in->variant.fileVariant.fileSize -
3789 ((chunk - 1) * dev->nBytesPerChunk);
3791 if (nBytesRead > dev->nBytesPerChunk) {
3792 nBytesRead = dev->nBytesPerChunk;
3797 (start + n)) ? nBytesRead : (start + n);
3800 nToCopy = dev->nBytesPerChunk - start;
3801 nToWriteBack = dev->nBytesPerChunk;
3804 if (nToCopy != dev->nBytesPerChunk) {
3805 /* An incomplete start or end chunk (or maybe both start and end chunk) */
3806 if (dev->nShortOpCaches > 0) {
3807 yaffs_ChunkCache *cache;
3808 /* If we can't find the data in the cache, then load the cache */
3809 cache = yaffs_FindChunkCache(in, chunk);
3812 && yaffs_CheckSpaceForAllocation(in->
3814 cache = yaffs_GrabChunkCache(in->myDev);
3816 cache->chunkId = chunk;
3819 yaffs_ReadChunkDataFromObject(in, chunk,
3825 !yaffs_CheckSpaceForAllocation(in->myDev)){
3826 /* Drop the cache if it was a read cache item and
3827 * no space check has been made for it.
3833 yaffs_UseChunkCache(dev, cache, 1);
3835 #ifdef CONFIG_YAFFS_WINCE
3836 yfsd_UnlockYAFFS(TRUE);
3839 memcpy(&cache->data[start], buffer,
3842 #ifdef CONFIG_YAFFS_WINCE
3843 yfsd_LockYAFFS(TRUE);
3846 cache->nBytes = nToWriteBack;
3850 yaffs_WriteChunkDataToObject
3853 cache->data, cache->nBytes,
3859 chunkWritten = -1; /* fail the write */
3862 /* An incomplete start or end chunk (or maybe both start and end chunk)
3863 * Read into the local buffer then copy, then copy over and write back.
3867 yaffs_GetTempBuffer(dev, __LINE__);
3869 yaffs_ReadChunkDataFromObject(in, chunk,
3872 #ifdef CONFIG_YAFFS_WINCE
3873 yfsd_UnlockYAFFS(TRUE);
3876 memcpy(&localBuffer[start], buffer, nToCopy);
3878 #ifdef CONFIG_YAFFS_WINCE
3879 yfsd_LockYAFFS(TRUE);
3882 yaffs_WriteChunkDataToObject(in, chunk,
3887 yaffs_ReleaseTempBuffer(dev, localBuffer,
3894 #ifdef CONFIG_YAFFS_WINCE
3895 /* Under WinCE can't do direct transfer. Need to use a local buffer.
3896 * This is because we otherwise screw up WinCE's memory mapper
3898 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3899 #ifdef CONFIG_YAFFS_WINCE
3900 yfsd_UnlockYAFFS(TRUE);
3902 memcpy(localBuffer, buffer, dev->nBytesPerChunk);
3903 #ifdef CONFIG_YAFFS_WINCE
3904 yfsd_LockYAFFS(TRUE);
3907 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
3908 dev->nBytesPerChunk,
3910 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3912 /* A full chunk. Write directly from the supplied buffer. */
3914 yaffs_WriteChunkDataToObject(in, chunk, buffer,
3915 dev->nBytesPerChunk,
3918 /* Since we've overwritten the cached data, we better invalidate it. */
3919 yaffs_InvalidateChunkCache(in, chunk);
3922 if (chunkWritten >= 0) {
3931 /* Update file object */
3933 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
3934 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3943 /* ---------------------- File resizing stuff ------------------ */
3945 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
3948 yaffs_Device *dev = in->myDev;
3949 int oldFileSize = in->variant.fileVariant.fileSize;
3951 int lastDel = 1 + (oldFileSize - 1) / dev->nBytesPerChunk;
3953 int startDel = 1 + (newSize + dev->nBytesPerChunk - 1) /
3954 dev->nBytesPerChunk;
3958 /* Delete backwards so that we don't end up with holes if
3959 * power is lost part-way through the operation.
3961 for (i = lastDel; i >= startDel; i--) {
3962 /* NB this could be optimised somewhat,
3963 * eg. could retrieve the tags and write them without
3964 * using yaffs_DeleteChunk
3967 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
3970 (dev->internalStartBlock * dev->nChunksPerBlock)
3972 ((dev->internalEndBlock +
3973 1) * dev->nChunksPerBlock)) {
3974 T(YAFFS_TRACE_ALWAYS,
3975 (TSTR("Found daft chunkId %d for %d" TENDSTR),
3979 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
3986 int yaffs_ResizeFile(yaffs_Object * in, int newSize)
3989 int oldFileSize = in->variant.fileVariant.fileSize;
3990 int sizeOfPartialChunk;
3991 yaffs_Device *dev = in->myDev;
3993 sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
3995 yaffs_FlushFilesChunkCache(in);
3996 yaffs_InvalidateWholeChunkCache(in);
3998 yaffs_CheckGarbageCollection(dev);
4000 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
4001 return yaffs_GetFileSize(in);
4004 if (newSize == oldFileSize) {
4008 if (newSize < oldFileSize) {
4010 yaffs_PruneResizedChunks(in, newSize);
4012 if (sizeOfPartialChunk != 0) {
4013 int lastChunk = 1 + newSize / dev->nBytesPerChunk;
4014 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4016 /* Got to read and rewrite the last chunk with its new size and zero pad */
4017 yaffs_ReadChunkDataFromObject(in, lastChunk,
4020 memset(localBuffer + sizeOfPartialChunk, 0,
4021 dev->nBytesPerChunk - sizeOfPartialChunk);
4023 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
4024 sizeOfPartialChunk, 1);
4026 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4029 in->variant.fileVariant.fileSize = newSize;
4031 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
4033 /* Write a new object header.
4034 * show we've shrunk the file, if need be
4035 * Do this only if the file is not in the deleted directories.
4037 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
4038 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
4039 yaffs_UpdateObjectHeader(in, NULL, 0,
4040 (newSize < oldFileSize) ? 1 : 0, 0);
4046 loff_t yaffs_GetFileSize(yaffs_Object * obj)
4048 obj = yaffs_GetEquivalentObject(obj);
4050 switch (obj->variantType) {
4051 case YAFFS_OBJECT_TYPE_FILE:
4052 return obj->variant.fileVariant.fileSize;
4053 case YAFFS_OBJECT_TYPE_SYMLINK:
4054 return yaffs_strlen(obj->variant.symLinkVariant.alias);
4062 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
4066 yaffs_FlushFilesChunkCache(in);
4068 #ifdef CONFIG_YAFFS_WINCE
4069 yfsd_WinFileTimeNow(in->win_mtime);
4072 in->yst_mtime = Y_CURRENT_TIME;
4078 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
4079 0) ? YAFFS_OK : YAFFS_FAIL;
4088 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
4091 /* First off, invalidate the file's data in the cache, without flushing. */
4092 yaffs_InvalidateWholeChunkCache(in);
4094 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
4095 /* Move to the unlinked directory so we have a record that it was deleted. */
4096 yaffs_ChangeObjectName(in, in->myDev->deletedDir, NULL, 0, 0);
4100 yaffs_RemoveObjectFromDirectory(in);
4101 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
4104 yaffs_FreeObject(in);
4109 /* yaffs_DeleteFile deletes the whole file data
4110 * and the inode associated with the file.
4111 * It does not delete the links associated with the file.
4113 static int yaffs_UnlinkFile(yaffs_Object * in)
4117 int immediateDeletion = 0;
4122 immediateDeletion = 1;
4126 if (in->inUse <= 0) {
4127 immediateDeletion = 1;
4131 if (immediateDeletion) {
4133 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
4135 T(YAFFS_TRACE_TRACING,
4136 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
4139 in->myDev->nDeletedFiles++;
4140 if (0 && in->myDev->isYaffs2) {
4141 yaffs_ResizeFile(in, 0);
4143 yaffs_SoftDeleteFile(in);
4146 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
4154 int yaffs_DeleteFile(yaffs_Object * in)
4156 int retVal = YAFFS_OK;
4158 if (in->nDataChunks > 0) {
4159 /* Use soft deletion if there is data in the file */
4160 if (!in->unlinked) {
4161 retVal = yaffs_UnlinkFile(in);
4163 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
4165 in->myDev->nDeletedFiles++;
4166 yaffs_SoftDeleteFile(in);
4168 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
4170 /* The file has no data chunks so we toss it immediately */
4171 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
4172 in->variant.fileVariant.top = NULL;
4173 yaffs_DoGenericObjectDeletion(in);
4179 static int yaffs_DeleteDirectory(yaffs_Object * in)
4181 /* First check that the directory is empty. */
4182 if (list_empty(&in->variant.directoryVariant.children)) {
4183 return yaffs_DoGenericObjectDeletion(in);
4190 static int yaffs_DeleteSymLink(yaffs_Object * in)
4192 YFREE(in->variant.symLinkVariant.alias);
4194 return yaffs_DoGenericObjectDeletion(in);
4197 static int yaffs_DeleteHardLink(yaffs_Object * in)
4199 /* remove this hardlink from the list assocaited with the equivalent
4202 list_del(&in->hardLinks);
4203 return yaffs_DoGenericObjectDeletion(in);
4206 static void yaffs_DestroyObject(yaffs_Object * obj)
4208 switch (obj->variantType) {
4209 case YAFFS_OBJECT_TYPE_FILE:
4210 yaffs_DeleteFile(obj);
4212 case YAFFS_OBJECT_TYPE_DIRECTORY:
4213 yaffs_DeleteDirectory(obj);
4215 case YAFFS_OBJECT_TYPE_SYMLINK:
4216 yaffs_DeleteSymLink(obj);
4218 case YAFFS_OBJECT_TYPE_HARDLINK:
4219 yaffs_DeleteHardLink(obj);
4221 case YAFFS_OBJECT_TYPE_SPECIAL:
4222 yaffs_DoGenericObjectDeletion(obj);
4224 case YAFFS_OBJECT_TYPE_UNKNOWN:
4225 break; /* should not happen. */
4229 static int yaffs_UnlinkWorker(yaffs_Object * obj)
4232 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4233 return yaffs_DeleteHardLink(obj);
4234 } else if (!list_empty(&obj->hardLinks)) {
4235 /* Curve ball: We're unlinking an object that has a hardlink.
4237 * This problem arises because we are not strictly following
4238 * The Linux link/inode model.
4240 * We can't really delete the object.
4241 * Instead, we do the following:
4242 * - Select a hardlink.
4243 * - Unhook it from the hard links
4244 * - Unhook it from its parent directory (so that the rename can work)
4245 * - Rename the object to the hardlink's name.
4246 * - Delete the hardlink
4251 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
4253 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
4255 list_del_init(&hl->hardLinks);
4256 list_del_init(&hl->siblings);
4258 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
4260 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
4262 if (retVal == YAFFS_OK) {
4263 retVal = yaffs_DoGenericObjectDeletion(hl);
4268 switch (obj->variantType) {
4269 case YAFFS_OBJECT_TYPE_FILE:
4270 return yaffs_UnlinkFile(obj);
4272 case YAFFS_OBJECT_TYPE_DIRECTORY:
4273 return yaffs_DeleteDirectory(obj);
4275 case YAFFS_OBJECT_TYPE_SYMLINK:
4276 return yaffs_DeleteSymLink(obj);
4278 case YAFFS_OBJECT_TYPE_SPECIAL:
4279 return yaffs_DoGenericObjectDeletion(obj);
4281 case YAFFS_OBJECT_TYPE_HARDLINK:
4282 case YAFFS_OBJECT_TYPE_UNKNOWN:
4290 static int yaffs_UnlinkObject( yaffs_Object *obj)
4293 if (obj && obj->unlinkAllowed) {
4294 return yaffs_UnlinkWorker(obj);
4300 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
4304 obj = yaffs_FindObjectByName(dir, name);
4305 return yaffs_UnlinkObject(obj);
4308 /*----------------------- Initialisation Scanning ---------------------- */
4310 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
4311 int backwardScanning)
4315 if (!backwardScanning) {
4316 /* Handle YAFFS1 forward scanning case
4317 * For YAFFS1 we always do the deletion
4321 /* Handle YAFFS2 case (backward scanning)
4322 * If the shadowed object exists then ignore.
4324 if (yaffs_FindObjectByNumber(dev, objId)) {
4329 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
4330 * We put it in unlinked dir to be cleaned up after the scanning
4333 yaffs_FindOrCreateObjectByNumber(dev, objId,
4334 YAFFS_OBJECT_TYPE_FILE);
4335 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
4336 obj->variant.fileVariant.shrinkSize = 0;
4337 obj->valid = 1; /* So that we don't read any other info for this file */
4347 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
4354 hardList = (yaffs_Object *) (hardList->hardLinks.next);
4356 in = yaffs_FindObjectByNumber(dev,
4357 hl->variant.hardLinkVariant.
4358 equivalentObjectId);
4361 /* Add the hardlink pointers */
4362 hl->variant.hardLinkVariant.equivalentObject = in;
4363 list_add(&hl->hardLinks, &in->hardLinks);
4365 /* Todo Need to report/handle this better.
4366 * Got a problem... hardlink to a non-existant object
4368 hl->variant.hardLinkVariant.equivalentObject = NULL;
4369 INIT_LIST_HEAD(&hl->hardLinks);
4381 static int yaffs_Scan(yaffs_Device * dev)
4383 yaffs_ExtendedTags tags;
4388 int nBlocksToScan = 0;
4393 yaffs_BlockState state;
4394 yaffs_Object *hardList = NULL;
4396 yaffs_BlockInfo *bi;
4398 yaffs_ObjectHeader *oh;
4400 yaffs_Object *parent;
4401 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4405 yaffs_BlockIndex *blockIndex = NULL;
4408 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
4409 dev->internalStartBlock, dev->internalEndBlock));
4411 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4413 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4415 if (dev->isYaffs2) {
4416 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4419 /* Scan all the blocks to determine their state */
4420 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
4421 bi = yaffs_GetBlockInfo(dev, blk);
4422 yaffs_ClearChunkBits(dev, blk);
4424 bi->softDeletions = 0;
4426 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
4428 bi->blockState = state;
4429 bi->sequenceNumber = sequenceNumber;
4431 T(YAFFS_TRACE_SCAN_DEBUG,
4432 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
4433 state, sequenceNumber));
4435 if (state == YAFFS_BLOCK_STATE_DEAD) {
4436 T(YAFFS_TRACE_BAD_BLOCKS,
4437 (TSTR("block %d is bad" TENDSTR), blk));
4438 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
4439 T(YAFFS_TRACE_SCAN_DEBUG,
4440 (TSTR("Block empty " TENDSTR)));
4441 dev->nErasedBlocks++;
4442 dev->nFreeChunks += dev->nChunksPerBlock;
4443 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4445 /* Determine the highest sequence number */
4446 if (dev->isYaffs2 &&
4447 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4448 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
4450 blockIndex[nBlocksToScan].seq = sequenceNumber;
4451 blockIndex[nBlocksToScan].block = blk;
4455 if (sequenceNumber >= dev->sequenceNumber) {
4456 dev->sequenceNumber = sequenceNumber;
4458 } else if (dev->isYaffs2) {
4459 /* TODO: Nasty sequence number! */
4462 ("Block scanning block %d has bad sequence number %d"
4463 TENDSTR), blk, sequenceNumber));
4470 * Dungy old bubble sort for now...
4472 if (dev->isYaffs2) {
4473 yaffs_BlockIndex temp;
4477 for (i = 0; i < nBlocksToScan; i++)
4478 for (j = i + 1; j < nBlocksToScan; j++)
4479 if (blockIndex[i].seq > blockIndex[j].seq) {
4480 temp = blockIndex[j];
4481 blockIndex[j] = blockIndex[i];
4482 blockIndex[i] = temp;
4486 /* Now scan the blocks looking at the data. */
4487 if (dev->isYaffs2) {
4489 endIterator = nBlocksToScan - 1;
4490 T(YAFFS_TRACE_SCAN_DEBUG,
4491 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
4493 startIterator = dev->internalStartBlock;
4494 endIterator = dev->internalEndBlock;
4497 /* For each block.... */
4498 for (blockIterator = startIterator; blockIterator <= endIterator;
4501 if (dev->isYaffs2) {
4502 /* get the block to scan in the correct order */
4503 blk = blockIndex[blockIterator].block;
4505 blk = blockIterator;
4508 bi = yaffs_GetBlockInfo(dev, blk);
4509 state = bi->blockState;
4513 /* For each chunk in each block that needs scanning....*/
4514 for (c = 0; c < dev->nChunksPerBlock &&
4515 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
4516 /* Read the tags and decide what to do */
4517 chunk = blk * dev->nChunksPerBlock + c;
4519 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
4522 /* Let's have a good look at this chunk... */
4524 if (!dev->isYaffs2 && tags.chunkDeleted) {
4530 /*T((" %d %d deleted\n",blk,c)); */
4531 } else if (!tags.chunkUsed) {
4532 /* An unassigned chunk in the block
4533 * This means that either the block is empty or
4534 * this is the one being allocated from
4538 /* We're looking at the first chunk in the block so the block is unused */
4539 state = YAFFS_BLOCK_STATE_EMPTY;
4540 dev->nErasedBlocks++;
4542 /* this is the block being allocated from */
4545 (" Allocating from %d %d" TENDSTR),
4547 state = YAFFS_BLOCK_STATE_ALLOCATING;
4548 dev->allocationBlock = blk;
4549 dev->allocationPage = c;
4550 dev->allocationBlockFinder = blk;
4551 /* Set it to here to encourage the allocator to go forth from here. */
4553 /* Yaffs2 sanity check:
4554 * This should be the one with the highest sequence number
4557 && (dev->sequenceNumber !=
4558 bi->sequenceNumber)) {
4559 T(YAFFS_TRACE_ALWAYS,
4561 ("yaffs: Allocation block %d was not highest sequence id:"
4562 " block seq = %d, dev seq = %d"
4563 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
4567 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4568 } else if (tags.chunkId > 0) {
4569 /* chunkId > 0 so it is a data chunk... */
4570 unsigned int endpos;
4572 yaffs_SetChunkBit(dev, blk, c);
4575 in = yaffs_FindOrCreateObjectByNumber(dev,
4578 YAFFS_OBJECT_TYPE_FILE);
4579 /* PutChunkIntoFile checks for a clash (two data chunks with
4580 * the same chunkId).
4582 yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,
4585 (tags.chunkId - 1) * dev->nBytesPerChunk +
4587 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
4588 && in->variant.fileVariant.scannedFileSize <
4590 in->variant.fileVariant.
4591 scannedFileSize = endpos;
4592 if (!dev->useHeaderFileSize) {
4593 in->variant.fileVariant.
4595 in->variant.fileVariant.
4600 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
4602 /* chunkId == 0, so it is an ObjectHeader.
4603 * Thus, we read in the object header and make the object
4605 yaffs_SetChunkBit(dev, blk, c);
4608 yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
4612 oh = (yaffs_ObjectHeader *) chunkData;
4614 in = yaffs_FindObjectByNumber(dev,
4616 if (in && in->variantType != oh->type) {
4617 /* This should not happen, but somehow
4618 * Wev'e ended up with an objectId that has been reused but not yet
4619 * deleted, and worse still it has changed type. Delete the old object.
4622 yaffs_DestroyObject(in);
4627 in = yaffs_FindOrCreateObjectByNumber(dev,
4632 if (oh->shadowsObject > 0) {
4633 yaffs_HandleShadowedObject(dev,
4640 /* We have already filled this one. We have a duplicate and need to resolve it. */
4642 unsigned existingSerial = in->serial;
4643 unsigned newSerial = tags.serialNumber;
4645 if (dev->isYaffs2 ||
4646 ((existingSerial + 1) & 3) ==
4648 /* Use new one - destroy the exisiting one */
4649 yaffs_DeleteChunk(dev,
4654 /* Use existing - destroy this one. */
4655 yaffs_DeleteChunk(dev, chunk, 1,
4661 (tags.objectId == YAFFS_OBJECTID_ROOT ||
4662 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
4663 /* We only load some info, don't fiddle with directory structure */
4665 in->variantType = oh->type;
4667 in->yst_mode = oh->yst_mode;
4668 #ifdef CONFIG_YAFFS_WINCE
4669 in->win_atime[0] = oh->win_atime[0];
4670 in->win_ctime[0] = oh->win_ctime[0];
4671 in->win_mtime[0] = oh->win_mtime[0];
4672 in->win_atime[1] = oh->win_atime[1];
4673 in->win_ctime[1] = oh->win_ctime[1];
4674 in->win_mtime[1] = oh->win_mtime[1];
4676 in->yst_uid = oh->yst_uid;
4677 in->yst_gid = oh->yst_gid;
4678 in->yst_atime = oh->yst_atime;
4679 in->yst_mtime = oh->yst_mtime;
4680 in->yst_ctime = oh->yst_ctime;
4681 in->yst_rdev = oh->yst_rdev;
4683 in->chunkId = chunk;
4685 } else if (!in->valid) {
4686 /* we need to load this info */
4689 in->variantType = oh->type;
4691 in->yst_mode = oh->yst_mode;
4692 #ifdef CONFIG_YAFFS_WINCE
4693 in->win_atime[0] = oh->win_atime[0];
4694 in->win_ctime[0] = oh->win_ctime[0];
4695 in->win_mtime[0] = oh->win_mtime[0];
4696 in->win_atime[1] = oh->win_atime[1];
4697 in->win_ctime[1] = oh->win_ctime[1];
4698 in->win_mtime[1] = oh->win_mtime[1];
4700 in->yst_uid = oh->yst_uid;
4701 in->yst_gid = oh->yst_gid;
4702 in->yst_atime = oh->yst_atime;
4703 in->yst_mtime = oh->yst_mtime;
4704 in->yst_ctime = oh->yst_ctime;
4705 in->yst_rdev = oh->yst_rdev;
4707 in->chunkId = chunk;
4709 yaffs_SetObjectName(in, oh->name);
4712 /* directory stuff...
4717 yaffs_FindOrCreateObjectByNumber
4718 (dev, oh->parentObjectId,
4719 YAFFS_OBJECT_TYPE_DIRECTORY);
4720 if (parent->variantType ==
4721 YAFFS_OBJECT_TYPE_UNKNOWN) {
4722 /* Set up as a directory */
4723 parent->variantType =
4724 YAFFS_OBJECT_TYPE_DIRECTORY;
4725 INIT_LIST_HEAD(&parent->variant.
4728 } else if (parent->variantType !=
4729 YAFFS_OBJECT_TYPE_DIRECTORY)
4731 /* Hoosterman, another problem....
4732 * We're trying to use a non-directory as a directory
4735 T(YAFFS_TRACE_ERROR,
4737 ("yaffs tragedy: attempting to use non-directory as"
4738 " a directory in scan. Put in lost+found."
4740 parent = dev->lostNFoundDir;
4743 yaffs_AddObjectToDirectory(parent, in);
4745 if (0 && (parent == dev->deletedDir ||
4746 parent == dev->unlinkedDir)) {
4747 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
4748 dev->nDeletedFiles++;
4750 /* Note re hardlinks.
4751 * Since we might scan a hardlink before its equivalent object is scanned
4752 * we put them all in a list.
4753 * After scanning is complete, we should have all the objects, so we run through this
4754 * list and fix up all the chains.
4757 switch (in->variantType) {
4758 case YAFFS_OBJECT_TYPE_UNKNOWN:
4759 /* Todo got a problem */
4761 case YAFFS_OBJECT_TYPE_FILE:
4764 /* Prune back the shrunken chunks */
4765 yaffs_PruneResizedChunks
4767 /* Mark the block as having a shrinkHeader */
4768 bi->hasShrinkHeader = 1;
4771 if (dev->useHeaderFileSize)
4773 in->variant.fileVariant.
4778 case YAFFS_OBJECT_TYPE_HARDLINK:
4779 in->variant.hardLinkVariant.
4780 equivalentObjectId =
4781 oh->equivalentObjectId;
4782 in->hardLinks.next =
4783 (struct list_head *)
4787 case YAFFS_OBJECT_TYPE_DIRECTORY:
4790 case YAFFS_OBJECT_TYPE_SPECIAL:
4793 case YAFFS_OBJECT_TYPE_SYMLINK:
4794 in->variant.symLinkVariant.
4796 yaffs_CloneString(oh->alias);
4800 if (parent == dev->deletedDir) {
4801 yaffs_DestroyObject(in);
4802 bi->hasShrinkHeader = 1;
4808 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4809 /* If we got this far while scanning, then the block is fully allocated.*/
4810 state = YAFFS_BLOCK_STATE_FULL;
4813 bi->blockState = state;
4815 /* Now let's see if it was dirty */
4816 if (bi->pagesInUse == 0 &&
4817 !bi->hasShrinkHeader &&
4818 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
4819 yaffs_BlockBecameDirty(dev, blk);
4829 /* Ok, we've done all the scanning.
4830 * Fix up the hard link chains.
4831 * We should now have scanned all the objects, now it's time to add these
4835 yaffs_HardlinkFixup(dev,hardList);
4837 /* Handle the unlinked files. Since they were left in an unlinked state we should
4841 struct list_head *i;
4842 struct list_head *n;
4845 /* Soft delete all the unlinked files */
4846 list_for_each_safe(i, n,
4847 &dev->unlinkedDir->variant.directoryVariant.
4850 l = list_entry(i, yaffs_Object, siblings);
4851 yaffs_DestroyObject(l);
4856 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4858 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
4863 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
4866 yaffs_ObjectHeader *oh;
4867 yaffs_Device *dev = in->myDev;
4871 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4873 yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,NULL);
4874 oh = (yaffs_ObjectHeader *) chunkData;
4876 in->yst_mode = oh->yst_mode;
4877 #ifdef CONFIG_YAFFS_WINCE
4878 in->win_atime[0] = oh->win_atime[0];
4879 in->win_ctime[0] = oh->win_ctime[0];
4880 in->win_mtime[0] = oh->win_mtime[0];
4881 in->win_atime[1] = oh->win_atime[1];
4882 in->win_ctime[1] = oh->win_ctime[1];
4883 in->win_mtime[1] = oh->win_mtime[1];
4885 in->yst_uid = oh->yst_uid;
4886 in->yst_gid = oh->yst_gid;
4887 in->yst_atime = oh->yst_atime;
4888 in->yst_mtime = oh->yst_mtime;
4889 in->yst_ctime = oh->yst_ctime;
4890 in->yst_rdev = oh->yst_rdev;
4893 yaffs_SetObjectName(in, oh->name);
4895 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4896 in->variant.symLinkVariant.alias =
4897 yaffs_CloneString(oh->alias);
4899 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
4903 static int yaffs_ScanBackwards(yaffs_Device * dev)
4905 yaffs_ExtendedTags tags;
4910 int nBlocksToScan = 0;
4915 yaffs_BlockState state;
4916 yaffs_Object *hardList = NULL;
4917 yaffs_BlockInfo *bi;
4919 yaffs_ObjectHeader *oh;
4921 yaffs_Object *parent;
4922 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4928 int equivalentObjectId;
4931 yaffs_BlockIndex *blockIndex = NULL;
4933 if (!dev->isYaffs2) {
4935 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
4941 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
4942 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
4944 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4946 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4948 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4950 /* Scan all the blocks to determine their state */
4951 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
4952 bi = yaffs_GetBlockInfo(dev, blk);
4953 yaffs_ClearChunkBits(dev, blk);
4955 bi->softDeletions = 0;
4957 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
4959 bi->blockState = state;
4960 bi->sequenceNumber = sequenceNumber;
4962 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
4963 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
4965 T(YAFFS_TRACE_SCAN_DEBUG,
4966 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
4967 state, sequenceNumber));
4970 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
4971 /* todo .. fix free space ? */
4973 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
4974 T(YAFFS_TRACE_BAD_BLOCKS,
4975 (TSTR("block %d is bad" TENDSTR), blk));
4976 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
4977 T(YAFFS_TRACE_SCAN_DEBUG,
4978 (TSTR("Block empty " TENDSTR)));
4979 dev->nErasedBlocks++;
4980 dev->nFreeChunks += dev->nChunksPerBlock;
4981 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4983 /* Determine the highest sequence number */
4984 if (dev->isYaffs2 &&
4985 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4986 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
4988 blockIndex[nBlocksToScan].seq = sequenceNumber;
4989 blockIndex[nBlocksToScan].block = blk;
4993 if (sequenceNumber >= dev->sequenceNumber) {
4994 dev->sequenceNumber = sequenceNumber;
4996 } else if (dev->isYaffs2) {
4997 /* TODO: Nasty sequence number! */
5000 ("Block scanning block %d has bad sequence number %d"
5001 TENDSTR), blk, sequenceNumber));
5009 * Dungy old bubble sort for now...
5012 yaffs_BlockIndex temp;
5016 for (i = 0; i < nBlocksToScan; i++)
5017 for (j = i + 1; j < nBlocksToScan; j++)
5018 if (blockIndex[i].seq > blockIndex[j].seq) {
5019 temp = blockIndex[j];
5020 blockIndex[j] = blockIndex[i];
5021 blockIndex[i] = temp;
5025 /* Now scan the blocks looking at the data. */
5027 endIterator = nBlocksToScan - 1;
5028 T(YAFFS_TRACE_SCAN_DEBUG,
5029 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5031 /* For each block.... backwards */
5032 for (blockIterator = endIterator; blockIterator >= startIterator;
5035 /* get the block to scan in the correct order */
5036 blk = blockIndex[blockIterator].block;
5038 bi = yaffs_GetBlockInfo(dev, blk);
5039 state = bi->blockState;
5043 /* For each chunk in each block that needs scanning.... */
5044 for (c = dev->nChunksPerBlock - 1; c >= 0 &&
5045 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
5046 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
5047 /* Scan backwards...
5048 * Read the tags and decide what to do
5050 chunk = blk * dev->nChunksPerBlock + c;
5052 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5055 /* Let's have a good look at this chunk... */
5057 if (!tags.chunkUsed) {
5058 // An unassigned chunk in the block
5059 // This means that either the block is empty or
5060 // this is the one being allocated from
5063 /* We're looking at the first chunk in the block so the block is unused */
5064 state = YAFFS_BLOCK_STATE_EMPTY;
5065 dev->nErasedBlocks++;
5067 /* this is the block being allocated from */
5069 YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5072 (" Allocating from %d %d"
5075 state = YAFFS_BLOCK_STATE_ALLOCATING;
5076 dev->allocationBlock = blk;
5077 dev->allocationPage = c;
5078 dev->allocationBlockFinder = blk;
5079 /* Set it to here to encourage the allocator to
5080 * go forth from here.
5083 /* Yaffs2 sanity check:
5084 * This should be the one with the highest sequence number
5087 && (dev->sequenceNumber !=
5088 bi->sequenceNumber)) {
5089 T(YAFFS_TRACE_ALWAYS,
5091 ("yaffs: Allocation block %d was not highest sequence "
5092 "id: block seq = %d, dev seq = %d"
5095 dev->sequenceNumber));
5100 } else if (tags.chunkId > 0) {
5101 /* chunkId > 0 so it is a data chunk... */
5102 unsigned int endpos;
5105 (tags.chunkId - 1) * dev->nBytesPerChunk;
5107 yaffs_SetChunkBit(dev, blk, c);
5110 in = yaffs_FindOrCreateObjectByNumber(dev,
5113 YAFFS_OBJECT_TYPE_FILE);
5114 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
5116 in->variant.fileVariant.shrinkSize) {
5117 /* This has not been invalidated by a resize */
5118 yaffs_PutChunkIntoFile(in, tags.chunkId,
5121 /* File size is calculated by looking at the data chunks if we have not
5122 * seen an object header yet. Stop this practice once we find an object header.
5126 1) * dev->nBytesPerChunk +
5129 if (!in->valid && /* have not got an object header yet */
5130 in->variant.fileVariant.
5131 scannedFileSize < endpos) {
5132 in->variant.fileVariant.
5133 scannedFileSize = endpos;
5134 in->variant.fileVariant.
5136 in->variant.fileVariant.
5141 /* This chunk has been invalidated by a resize, so delete */
5142 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
5146 /* chunkId == 0, so it is an ObjectHeader.
5147 * Thus, we read in the object header and make the object
5149 yaffs_SetChunkBit(dev, blk, c);
5155 if (tags.extraHeaderInfoAvailable) {
5156 in = yaffs_FindOrCreateObjectByNumber
5157 (dev, tags.objectId,
5158 tags.extraObjectType);
5162 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
5165 tags.extraShadows ||
5167 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5168 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
5171 /* If we don't have valid info then we need to read the chunk
5172 * TODO In future we can probably defer reading the chunk and
5173 * living with invalid data until needed.
5176 yaffs_ReadChunkWithTagsFromNAND(dev,
5181 oh = (yaffs_ObjectHeader *) chunkData;
5184 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
5189 /* TODO Hoosterman we have a problem! */
5190 T(YAFFS_TRACE_ERROR,
5192 ("yaffs tragedy: Could not make object for object %d "
5193 "at chunk %d during scan"
5194 TENDSTR), tags.objectId, chunk));
5199 /* We have already filled this one.
5200 * We have a duplicate that will be discarded, but
5201 * we first have to suck out resize info if it is a file.
5204 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
5206 oh-> type == YAFFS_OBJECT_TYPE_FILE)||
5207 (tags.extraHeaderInfoAvailable &&
5208 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
5211 (oh) ? oh->fileSize : tags.
5213 __u32 parentObjectId =
5215 parentObjectId : tags.
5216 extraParentObjectId;
5218 (oh) ? oh->isShrink : tags.
5219 extraIsShrinkHeader;
5221 /* If it is deleted (unlinked at start also means deleted)
5222 * we treat the file size as being zeroed at this point.
5224 if (parentObjectId ==
5225 YAFFS_OBJECTID_DELETED
5226 || parentObjectId ==
5227 YAFFS_OBJECTID_UNLINKED) {
5233 in->variant.fileVariant.
5234 shrinkSize > thisSize) {
5235 in->variant.fileVariant.
5241 bi->hasShrinkHeader = 1;
5245 /* Use existing - destroy this one. */
5246 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
5251 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5253 YAFFS_OBJECTID_LOSTNFOUND)) {
5254 /* We only load some info, don't fiddle with directory structure */
5258 in->variantType = oh->type;
5260 in->yst_mode = oh->yst_mode;
5261 #ifdef CONFIG_YAFFS_WINCE
5262 in->win_atime[0] = oh->win_atime[0];
5263 in->win_ctime[0] = oh->win_ctime[0];
5264 in->win_mtime[0] = oh->win_mtime[0];
5265 in->win_atime[1] = oh->win_atime[1];
5266 in->win_ctime[1] = oh->win_ctime[1];
5267 in->win_mtime[1] = oh->win_mtime[1];
5269 in->yst_uid = oh->yst_uid;
5270 in->yst_gid = oh->yst_gid;
5271 in->yst_atime = oh->yst_atime;
5272 in->yst_mtime = oh->yst_mtime;
5273 in->yst_ctime = oh->yst_ctime;
5274 in->yst_rdev = oh->yst_rdev;
5278 in->variantType = tags.extraObjectType;
5282 in->chunkId = chunk;
5284 } else if (!in->valid) {
5285 /* we need to load this info */
5288 in->chunkId = chunk;
5291 in->variantType = oh->type;
5293 in->yst_mode = oh->yst_mode;
5294 #ifdef CONFIG_YAFFS_WINCE
5295 in->win_atime[0] = oh->win_atime[0];
5296 in->win_ctime[0] = oh->win_ctime[0];
5297 in->win_mtime[0] = oh->win_mtime[0];
5298 in->win_atime[1] = oh->win_atime[1];
5299 in->win_ctime[1] = oh->win_ctime[1];
5300 in->win_mtime[1] = oh->win_mtime[1];
5302 in->yst_uid = oh->yst_uid;
5303 in->yst_gid = oh->yst_gid;
5304 in->yst_atime = oh->yst_atime;
5305 in->yst_mtime = oh->yst_mtime;
5306 in->yst_ctime = oh->yst_ctime;
5307 in->yst_rdev = oh->yst_rdev;
5310 if (oh->shadowsObject > 0)
5311 yaffs_HandleShadowedObject(dev,
5317 yaffs_SetObjectName(in, oh->name);
5319 yaffs_FindOrCreateObjectByNumber
5320 (dev, oh->parentObjectId,
5321 YAFFS_OBJECT_TYPE_DIRECTORY);
5323 fileSize = oh->fileSize;
5324 isShrink = oh->isShrink;
5325 equivalentObjectId = oh->equivalentObjectId;
5329 in->variantType = tags.extraObjectType;
5331 yaffs_FindOrCreateObjectByNumber
5332 (dev, tags.extraParentObjectId,
5333 YAFFS_OBJECT_TYPE_DIRECTORY);
5334 fileSize = tags.extraFileLength;
5335 isShrink = tags.extraIsShrinkHeader;
5336 equivalentObjectId = tags.extraEquivalentObjectId;
5342 /* directory stuff...
5346 if (parent->variantType ==
5347 YAFFS_OBJECT_TYPE_UNKNOWN) {
5348 /* Set up as a directory */
5349 parent->variantType =
5350 YAFFS_OBJECT_TYPE_DIRECTORY;
5351 INIT_LIST_HEAD(&parent->variant.
5354 } else if (parent->variantType !=
5355 YAFFS_OBJECT_TYPE_DIRECTORY)
5357 /* Hoosterman, another problem....
5358 * We're trying to use a non-directory as a directory
5361 T(YAFFS_TRACE_ERROR,
5363 ("yaffs tragedy: attempting to use non-directory as"
5364 " a directory in scan. Put in lost+found."
5366 parent = dev->lostNFoundDir;
5369 yaffs_AddObjectToDirectory(parent, in);
5371 itsUnlinked = (parent == dev->deletedDir) ||
5372 (parent == dev->unlinkedDir);
5375 /* Mark the block as having a shrinkHeader */
5376 bi->hasShrinkHeader = 1;
5379 /* Note re hardlinks.
5380 * Since we might scan a hardlink before its equivalent object is scanned
5381 * we put them all in a list.
5382 * After scanning is complete, we should have all the objects, so we run
5383 * through this list and fix up all the chains.
5386 switch (in->variantType) {
5387 case YAFFS_OBJECT_TYPE_UNKNOWN:
5388 /* Todo got a problem */
5390 case YAFFS_OBJECT_TYPE_FILE:
5392 if (in->variant.fileVariant.
5393 scannedFileSize < fileSize) {
5394 /* This covers the case where the file size is greater
5395 * than where the data is
5396 * This will happen if the file is resized to be larger
5397 * than its current data extents.
5399 in->variant.fileVariant.fileSize = fileSize;
5400 in->variant.fileVariant.scannedFileSize =
5401 in->variant.fileVariant.fileSize;
5405 in->variant.fileVariant.shrinkSize > fileSize) {
5406 in->variant.fileVariant.shrinkSize = fileSize;
5410 case YAFFS_OBJECT_TYPE_HARDLINK:
5412 in->variant.hardLinkVariant.equivalentObjectId =
5414 in->hardLinks.next =
5415 (struct list_head *) hardList;
5419 case YAFFS_OBJECT_TYPE_DIRECTORY:
5422 case YAFFS_OBJECT_TYPE_SPECIAL:
5425 case YAFFS_OBJECT_TYPE_SYMLINK:
5427 in->variant.symLinkVariant.alias =
5428 yaffs_CloneString(oh->
5437 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5438 /* If we got this far while scanning, then the block is fully allocated. */
5439 state = YAFFS_BLOCK_STATE_FULL;
5442 bi->blockState = state;
5444 /* Now let's see if it was dirty */
5445 if (bi->pagesInUse == 0 &&
5446 !bi->hasShrinkHeader &&
5447 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5448 yaffs_BlockBecameDirty(dev, blk);
5456 /* Ok, we've done all the scanning.
5457 * Fix up the hard link chains.
5458 * We should now have scanned all the objects, now it's time to add these
5461 yaffs_HardlinkFixup(dev,hardList);
5465 * Sort out state of unlinked and deleted objects.
5468 struct list_head *i;
5469 struct list_head *n;
5473 /* Soft delete all the unlinked files */
5474 list_for_each_safe(i, n,
5475 &dev->unlinkedDir->variant.directoryVariant.
5478 l = list_entry(i, yaffs_Object, siblings);
5479 yaffs_DestroyObject(l);
5483 /* Soft delete all the deletedDir files */
5484 list_for_each_safe(i, n,
5485 &dev->deletedDir->variant.directoryVariant.
5488 l = list_entry(i, yaffs_Object, siblings);
5489 yaffs_DestroyObject(l);
5495 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5497 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
5502 /*------------------------------ Directory Functions ----------------------------- */
5504 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
5506 yaffs_Device *dev = obj->myDev;
5508 if(dev && dev->removeObjectCallback)
5509 dev->removeObjectCallback(obj);
5511 list_del_init(&obj->siblings);
5516 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
5521 T(YAFFS_TRACE_ALWAYS,
5523 ("tragedy: Trying to add an object to a null pointer directory"
5527 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5528 T(YAFFS_TRACE_ALWAYS,
5530 ("tragedy: Trying to add an object to a non-directory"
5535 if (obj->siblings.prev == NULL) {
5536 /* Not initialised */
5537 INIT_LIST_HEAD(&obj->siblings);
5539 } else if (!list_empty(&obj->siblings)) {
5540 /* If it is holed up somewhere else, un hook it */
5541 yaffs_RemoveObjectFromDirectory(obj);
5544 list_add(&obj->siblings, &directory->variant.directoryVariant.children);
5545 obj->parent = directory;
5547 if (directory == obj->myDev->unlinkedDir
5548 || directory == obj->myDev->deletedDir) {
5550 obj->myDev->nUnlinkedFiles++;
5551 obj->renameAllowed = 0;
5555 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
5560 struct list_head *i;
5561 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
5570 T(YAFFS_TRACE_ALWAYS,
5572 ("tragedy: yaffs_FindObjectByName: null pointer directory"
5576 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5577 T(YAFFS_TRACE_ALWAYS,
5579 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5583 sum = yaffs_CalcNameSum(name);
5585 list_for_each(i, &directory->variant.directoryVariant.children) {
5587 l = list_entry(i, yaffs_Object, siblings);
5589 yaffs_CheckObjectDetailsLoaded(l);
5591 /* Special case for lost-n-found */
5592 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5593 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
5596 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
5598 /* LostnFound cunk called Objxxx
5601 yaffs_GetObjectName(l, buffer,
5602 YAFFS_MAX_NAME_LENGTH);
5603 if (yaffs_strcmp(name, buffer) == 0) {
5616 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
5617 int (*fn) (yaffs_Object *))
5619 struct list_head *i;
5623 T(YAFFS_TRACE_ALWAYS,
5625 ("tragedy: yaffs_FindObjectByName: null pointer directory"
5629 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5630 T(YAFFS_TRACE_ALWAYS,
5632 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5636 list_for_each(i, &theDir->variant.directoryVariant.children) {
5638 l = list_entry(i, yaffs_Object, siblings);
5650 /* GetEquivalentObject dereferences any hard links to get to the
5654 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
5656 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5657 /* We want the object id of the equivalent object, not this one */
5658 obj = obj->variant.hardLinkVariant.equivalentObject;
5664 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
5666 memset(name, 0, buffSize * sizeof(YCHAR));
5668 yaffs_CheckObjectDetailsLoaded(obj);
5670 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5671 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
5672 } else if (obj->chunkId <= 0) {
5674 /* make up a name */
5675 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
5677 yaffs_strncpy(name, locName, buffSize - 1);
5680 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
5681 else if (obj->shortName[0]) {
5682 yaffs_strcpy(name, obj->shortName);
5686 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
5688 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
5690 memset(buffer, 0, obj->myDev->nBytesPerChunk);
5692 if (obj->chunkId >= 0) {
5693 yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
5694 obj->chunkId, buffer,
5697 yaffs_strncpy(name, oh->name, buffSize - 1);
5699 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
5702 return yaffs_strlen(name);
5705 int yaffs_GetObjectFileLength(yaffs_Object * obj)
5708 /* Dereference any hard linking */
5709 obj = yaffs_GetEquivalentObject(obj);
5711 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
5712 return obj->variant.fileVariant.fileSize;
5714 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5715 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5717 /* Only a directory should drop through to here */
5718 return obj->myDev->nBytesPerChunk;
5722 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
5725 struct list_head *i;
5727 if (!obj->unlinked) {
5728 count++; /* the object itself */
5730 list_for_each(i, &obj->hardLinks) {
5731 count++; /* add the hard links; */
5737 int yaffs_GetObjectInode(yaffs_Object * obj)
5739 obj = yaffs_GetEquivalentObject(obj);
5741 return obj->objectId;
5744 unsigned yaffs_GetObjectType(yaffs_Object * obj)
5746 obj = yaffs_GetEquivalentObject(obj);
5748 switch (obj->variantType) {
5749 case YAFFS_OBJECT_TYPE_FILE:
5752 case YAFFS_OBJECT_TYPE_DIRECTORY:
5755 case YAFFS_OBJECT_TYPE_SYMLINK:
5758 case YAFFS_OBJECT_TYPE_HARDLINK:
5761 case YAFFS_OBJECT_TYPE_SPECIAL:
5762 if (S_ISFIFO(obj->yst_mode))
5764 if (S_ISCHR(obj->yst_mode))
5766 if (S_ISBLK(obj->yst_mode))
5768 if (S_ISSOCK(obj->yst_mode))
5776 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
5778 obj = yaffs_GetEquivalentObject(obj);
5779 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5780 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
5782 return yaffs_CloneString(_Y(""));
5786 #ifndef CONFIG_YAFFS_WINCE
5788 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
5790 unsigned int valid = attr->ia_valid;
5792 if (valid & ATTR_MODE)
5793 obj->yst_mode = attr->ia_mode;
5794 if (valid & ATTR_UID)
5795 obj->yst_uid = attr->ia_uid;
5796 if (valid & ATTR_GID)
5797 obj->yst_gid = attr->ia_gid;
5799 if (valid & ATTR_ATIME)
5800 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
5801 if (valid & ATTR_CTIME)
5802 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
5803 if (valid & ATTR_MTIME)
5804 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
5806 if (valid & ATTR_SIZE)
5807 yaffs_ResizeFile(obj, attr->ia_size);
5809 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
5814 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
5816 unsigned int valid = 0;
5818 attr->ia_mode = obj->yst_mode;
5820 attr->ia_uid = obj->yst_uid;
5822 attr->ia_gid = obj->yst_gid;
5825 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
5826 valid |= ATTR_ATIME;
5827 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
5828 valid |= ATTR_CTIME;
5829 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
5830 valid |= ATTR_MTIME;
5832 attr->ia_size = yaffs_GetFileSize(obj);
5835 attr->ia_valid = valid;
5844 int yaffs_DumpObject(yaffs_Object * obj)
5848 yaffs_GetObjectName(obj, name, 256);
5850 T(YAFFS_TRACE_ALWAYS,
5852 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
5853 " chunk %d type %d size %d\n"
5854 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
5855 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
5856 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
5862 /*---------------------------- Initialisation code -------------------------------------- */
5864 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
5867 /* Common functions, gotta have */
5868 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
5871 #ifdef CONFIG_YAFFS_YAFFS2
5873 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
5874 if (dev->writeChunkWithTagsToNAND &&
5875 dev->readChunkWithTagsFromNAND &&
5876 !dev->writeChunkToNAND &&
5877 !dev->readChunkFromNAND &&
5878 dev->markNANDBlockBad && dev->queryNANDBlock)
5882 /* Can use the "spare" style interface for yaffs1 */
5883 if (!dev->isYaffs2 &&
5884 !dev->writeChunkWithTagsToNAND &&
5885 !dev->readChunkWithTagsFromNAND &&
5886 dev->writeChunkToNAND &&
5887 dev->readChunkFromNAND &&
5888 !dev->markNANDBlockBad && !dev->queryNANDBlock)
5895 static void yaffs_CreateInitialDirectories(yaffs_Device *dev)
5897 /* Initialise the unlinked, deleted, root and lost and found directories */
5899 dev->lostNFoundDir = dev->rootDir = NULL;
5900 dev->unlinkedDir = dev->deletedDir = NULL;
5903 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5905 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
5908 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
5909 YAFFS_ROOT_MODE | S_IFDIR);
5910 dev->lostNFoundDir =
5911 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
5912 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
5913 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
5916 int yaffs_GutsInitialise(yaffs_Device * dev)
5922 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
5924 /* Check stuff that must be set */
5927 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
5931 dev->internalStartBlock = dev->startBlock;
5932 dev->internalEndBlock = dev->endBlock;
5933 dev->blockOffset = 0;
5934 dev->chunkOffset = 0;
5935 dev->nFreeChunks = 0;
5937 if (dev->startBlock == 0) {
5938 dev->internalStartBlock = dev->startBlock + 1;
5939 dev->internalEndBlock = dev->endBlock + 1;
5940 dev->blockOffset = 1;
5941 dev->chunkOffset = dev->nChunksPerBlock;
5944 /* Check geometry parameters. */
5946 if ((dev->isYaffs2 && dev->nBytesPerChunk < 1024) ||
5947 (!dev->isYaffs2 && dev->nBytesPerChunk != 512) ||
5948 dev->nChunksPerBlock < 2 ||
5949 dev->nReservedBlocks < 2 ||
5950 dev->internalStartBlock <= 0 ||
5951 dev->internalEndBlock <= 0 ||
5952 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
5954 T(YAFFS_TRACE_ALWAYS,
5956 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
5957 TENDSTR), dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
5961 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
5962 T(YAFFS_TRACE_ALWAYS,
5963 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5967 /* Got the right mix of functions? */
5968 if (!yaffs_CheckDevFunctions(dev)) {
5969 /* Function missing */
5970 T(YAFFS_TRACE_ALWAYS,
5972 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5977 /* This is really a compilation check. */
5978 if (!yaffs_CheckStructures()) {
5979 T(YAFFS_TRACE_ALWAYS,
5980 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
5984 if (dev->isMounted) {
5985 T(YAFFS_TRACE_ALWAYS,
5986 (TSTR("yaffs: device already mounted\n" TENDSTR)));
5990 /* Finished with most checks. One or two more checks happen later on too. */
5996 /* OK now calculate a few things for the device
5997 * Calculate chunkGroupBits.
5998 * We need to find the next power of 2 > than internalEndBlock
6001 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
6003 for (bits = extraBits = 0; x > 1; bits++) {
6012 /* Set up tnode width if wide tnodes are enabled. */
6013 if(!dev->wideTnodesDisabled){
6014 /* bits must be even so that we end up with 32-bit words */
6018 dev->tnodeWidth = 16;
6020 dev->tnodeWidth = bits;
6023 dev->tnodeWidth = 16;
6025 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
6027 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
6028 * so if the bitwidth of the
6029 * chunk range we're using is greater than 16 we need
6030 * to figure out chunk shift and chunkGroupSize
6033 if (bits <= dev->tnodeWidth)
6034 dev->chunkGroupBits = 0;
6036 dev->chunkGroupBits = bits - dev->tnodeWidth;
6039 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
6041 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
6042 /* We have a problem because the soft delete won't work if
6043 * the chunk group size > chunks per block.
6044 * This can be remedied by using larger "virtual blocks".
6046 T(YAFFS_TRACE_ALWAYS,
6047 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
6052 /* OK, we've finished verifying the device, lets continue with initialisation */
6054 /* More device initialisation */
6055 dev->garbageCollections = 0;
6056 dev->passiveGarbageCollections = 0;
6057 dev->currentDirtyChecker = 0;
6058 dev->bufferedBlock = -1;
6059 dev->doingBufferedBlockRewrite = 0;
6060 dev->nDeletedFiles = 0;
6061 dev->nBackgroundDeletions = 0;
6062 dev->nUnlinkedFiles = 0;
6064 dev->eccUnfixed = 0;
6065 dev->tagsEccFixed = 0;
6066 dev->tagsEccUnfixed = 0;
6067 dev->nErasureFailures = 0;
6068 dev->nErasedBlocks = 0;
6071 /* Initialise temporary buffers and caches. */
6074 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
6075 dev->tempBuffer[i].line = 0; /* not in use */
6076 dev->tempBuffer[i].buffer =
6077 YMALLOC(dev->nBytesPerChunk);
6081 if (dev->nShortOpCaches > 0) {
6084 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
6085 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
6089 YMALLOC(dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
6091 for (i = 0; i < dev->nShortOpCaches; i++) {
6092 dev->srCache[i].object = NULL;
6093 dev->srCache[i].lastUse = 0;
6094 dev->srCache[i].dirty = 0;
6095 dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
6102 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
6104 if (dev->isYaffs2) {
6105 dev->useHeaderFileSize = 1;
6108 yaffs_InitialiseBlocks(dev);
6109 yaffs_InitialiseTnodes(dev);
6110 yaffs_InitialiseObjects(dev);
6112 yaffs_CreateInitialDirectories(dev);
6115 /* Now scan the flash. */
6116 if (dev->isYaffs2) {
6117 if(yaffs_CheckpointRestore(dev)) {
6118 T(YAFFS_TRACE_ALWAYS,
6119 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
6122 /* Clean up the mess caused by an aborted checkpoint load
6123 * and scan backwards.
6125 yaffs_DeinitialiseBlocks(dev);
6126 yaffs_DeinitialiseTnodes(dev);
6127 yaffs_DeinitialiseObjects(dev);
6128 yaffs_InitialiseBlocks(dev);
6129 yaffs_InitialiseTnodes(dev);
6130 yaffs_InitialiseObjects(dev);
6131 yaffs_CreateInitialDirectories(dev);
6133 yaffs_ScanBackwards(dev);
6138 /* Zero out stats */
6139 dev->nPageReads = 0;
6140 dev->nPageWrites = 0;
6141 dev->nBlockErasures = 0;
6143 dev->nRetriedWrites = 0;
6145 dev->nRetiredBlocks = 0;
6147 yaffs_VerifyFreeChunks(dev);
6149 T(YAFFS_TRACE_TRACING,
6150 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
6155 void yaffs_Deinitialise(yaffs_Device * dev)
6157 if (dev->isMounted) {
6160 yaffs_DeinitialiseBlocks(dev);
6161 yaffs_DeinitialiseTnodes(dev);
6162 yaffs_DeinitialiseObjects(dev);
6163 if (dev->nShortOpCaches > 0) {
6165 for (i = 0; i < dev->nShortOpCaches; i++) {
6166 YFREE(dev->srCache[i].data);
6169 YFREE(dev->srCache);
6172 YFREE(dev->gcCleanupList);
6174 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
6175 YFREE(dev->tempBuffer[i].buffer);
6183 static int yaffs_CountFreeChunks(yaffs_Device * dev)
6188 yaffs_BlockInfo *blk;
6190 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
6192 blk = yaffs_GetBlockInfo(dev, b);
6194 switch (blk->blockState) {
6195 case YAFFS_BLOCK_STATE_EMPTY:
6196 case YAFFS_BLOCK_STATE_ALLOCATING:
6197 case YAFFS_BLOCK_STATE_COLLECTING:
6198 case YAFFS_BLOCK_STATE_FULL:
6200 (dev->nChunksPerBlock - blk->pagesInUse +
6201 blk->softDeletions);
6212 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
6214 /* This is what we report to the outside world */
6217 int nDirtyCacheChunks;
6218 int blocksForCheckpoint;
6221 nFree = dev->nFreeChunks;
6223 nFree = yaffs_CountFreeChunks(dev);
6226 nFree += dev->nDeletedFiles;
6228 /* Now count the number of dirty chunks in the cache and subtract those */
6232 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
6233 if (dev->srCache[i].dirty)
6234 nDirtyCacheChunks++;
6238 nFree -= nDirtyCacheChunks;
6240 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
6242 /* Now we figure out how much to reserve for the checkpoint and report that... */
6243 blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
6244 if(blocksForCheckpoint < 0)
6245 blocksForCheckpoint = 0;
6247 nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
6256 static int yaffs_freeVerificationFailures;
6258 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
6260 int counted = yaffs_CountFreeChunks(dev);
6262 int difference = dev->nFreeChunks - counted;
6265 T(YAFFS_TRACE_ALWAYS,
6266 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
6267 dev->nFreeChunks, counted, difference));
6268 yaffs_freeVerificationFailures++;
6272 /*---------------------------------------- YAFFS test code ----------------------*/
6274 #define yaffs_CheckStruct(structure,syze, name) \
6275 if(sizeof(structure) != syze) \
6277 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
6278 name,syze,sizeof(structure))); \
6279 return YAFFS_FAIL; \
6282 static int yaffs_CheckStructures(void)
6284 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
6285 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
6286 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
6287 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
6288 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
6290 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")