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[openwrt/staging/dedeckeh.git] / target / linux / generic-2.6 / files / fs / yaffs2 / yaffs_guts.c
1 /*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2007 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
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.
12 */
13
14 const char *yaffs_guts_c_version =
15
16 #include "yportenv.h"
17
18 #include "yaffsinterface.h"
19 #include "yaffs_guts.h"
20 #include "yaffs_tagsvalidity.h"
21
22 #include "yaffs_tagscompat.h"
23 #ifndef CONFIG_YAFFS_USE_OWN_SORT
24 #include "yaffs_qsort.h"
25 #endif
26 #include "yaffs_nand.h"
27
28 #include "yaffs_checkptrw.h"
29
30 #include "yaffs_nand.h"
31 #include "yaffs_packedtags2.h"
32
33
34 #ifdef CONFIG_YAFFS_WINCE
35 void yfsd_LockYAFFS(BOOL fsLockOnly);
36 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
37 #endif
38
39 #define YAFFS_PASSIVE_GC_CHUNKS 2
40
41 #include "yaffs_ecc.h"
42
43
44 /* Robustification (if it ever comes about...) */
45 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
46 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
47 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
48 const __u8 * data,
49 const yaffs_ExtendedTags * tags);
50 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
51 const yaffs_ExtendedTags * tags);
52
53 /* Other local prototypes */
54 static int yaffs_UnlinkObject( yaffs_Object *obj);
55 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
56
57 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
58
59 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
60 const __u8 * buffer,
61 yaffs_ExtendedTags * tags,
62 int useReserve);
63 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
64 int chunkInNAND, int inScan);
65
66 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
67 yaffs_ObjectType type);
68 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
69 yaffs_Object * obj);
70 static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
71 int force, int isShrink, int shadows);
72 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
73 static int yaffs_CheckStructures(void);
74 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
75 int chunkOffset, int *limit);
76 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
77
78 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
79
80 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
81 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
82 int lineNo);
83
84 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
85 int chunkInNAND);
86
87 static int yaffs_UnlinkWorker(yaffs_Object * obj);
88 static void yaffs_DestroyObject(yaffs_Object * obj);
89
90 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
91 int chunkInObject);
92
93 loff_t yaffs_GetFileSize(yaffs_Object * obj);
94
95 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
96
97 static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
98
99 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
100
101 #ifdef YAFFS_PARANOID
102 static int yaffs_CheckFileSanity(yaffs_Object * in);
103 #else
104 #define yaffs_CheckFileSanity(in)
105 #endif
106
107 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
108 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
109
110 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
111
112 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
113 yaffs_ExtendedTags * tags);
114
115 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
116 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
117 yaffs_FileStructure * fStruct,
118 __u32 chunkId);
119
120
121 /* Function to calculate chunk and offset */
122
123 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
124 {
125 if(dev->chunkShift){
126 /* Easy-peasy power of 2 case */
127 *chunk = (__u32)(addr >> dev->chunkShift);
128 *offset = (__u32)(addr & dev->chunkMask);
129 }
130 else if(dev->crumbsPerChunk)
131 {
132 /* Case where we're using "crumbs" */
133 *offset = (__u32)(addr & dev->crumbMask);
134 addr >>= dev->crumbShift;
135 *chunk = ((__u32)addr)/dev->crumbsPerChunk;
136 *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
137 }
138 else
139 YBUG();
140 }
141
142 /* Function to return the number of shifts for a power of 2 greater than or equal
143 * to the given number
144 * Note we don't try to cater for all possible numbers and this does not have to
145 * be hellishly efficient.
146 */
147
148 static __u32 ShiftsGE(__u32 x)
149 {
150 int extraBits;
151 int nShifts;
152
153 nShifts = extraBits = 0;
154
155 while(x>1){
156 if(x & 1) extraBits++;
157 x>>=1;
158 nShifts++;
159 }
160
161 if(extraBits)
162 nShifts++;
163
164 return nShifts;
165 }
166
167 /* Function to return the number of shifts to get a 1 in bit 0
168 */
169
170 static __u32 ShiftDiv(__u32 x)
171 {
172 int nShifts;
173
174 nShifts = 0;
175
176 if(!x) return 0;
177
178 while( !(x&1)){
179 x>>=1;
180 nShifts++;
181 }
182
183 return nShifts;
184 }
185
186
187
188 /*
189 * Temporary buffer manipulations.
190 */
191
192 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
193 {
194 int i;
195 __u8 *buf = (__u8 *)1;
196
197 memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
198
199 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
200 dev->tempBuffer[i].line = 0; /* not in use */
201 dev->tempBuffer[i].buffer = buf =
202 YMALLOC_DMA(dev->nDataBytesPerChunk);
203 }
204
205 return buf ? YAFFS_OK : YAFFS_FAIL;
206
207 }
208
209 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
210 {
211 int i, j;
212 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
213 if (dev->tempBuffer[i].line == 0) {
214 dev->tempBuffer[i].line = lineNo;
215 if ((i + 1) > dev->maxTemp) {
216 dev->maxTemp = i + 1;
217 for (j = 0; j <= i; j++)
218 dev->tempBuffer[j].maxLine =
219 dev->tempBuffer[j].line;
220 }
221
222 return dev->tempBuffer[i].buffer;
223 }
224 }
225
226 T(YAFFS_TRACE_BUFFERS,
227 (TSTR("Out of temp buffers at line %d, other held by lines:"),
228 lineNo));
229 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
230 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
231 }
232 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
233
234 /*
235 * If we got here then we have to allocate an unmanaged one
236 * This is not good.
237 */
238
239 dev->unmanagedTempAllocations++;
240 return YMALLOC(dev->nDataBytesPerChunk);
241
242 }
243
244 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
245 int lineNo)
246 {
247 int i;
248 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
249 if (dev->tempBuffer[i].buffer == buffer) {
250 dev->tempBuffer[i].line = 0;
251 return;
252 }
253 }
254
255 if (buffer) {
256 /* assume it is an unmanaged one. */
257 T(YAFFS_TRACE_BUFFERS,
258 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
259 lineNo));
260 YFREE(buffer);
261 dev->unmanagedTempDeallocations++;
262 }
263
264 }
265
266 /*
267 * Determine if we have a managed buffer.
268 */
269 int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
270 {
271 int i;
272 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
273 if (dev->tempBuffer[i].buffer == buffer)
274 return 1;
275
276 }
277
278 for (i = 0; i < dev->nShortOpCaches; i++) {
279 if( dev->srCache[i].data == buffer )
280 return 1;
281
282 }
283
284 if (buffer == dev->checkpointBuffer)
285 return 1;
286
287 T(YAFFS_TRACE_ALWAYS,
288 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
289 return 0;
290 }
291
292
293
294 /*
295 * Chunk bitmap manipulations
296 */
297
298 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
299 {
300 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
301 T(YAFFS_TRACE_ERROR,
302 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
303 blk));
304 YBUG();
305 }
306 return dev->chunkBits +
307 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
308 }
309
310 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
311 {
312 if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
313 chunk < 0 || chunk >= dev->nChunksPerBlock) {
314 T(YAFFS_TRACE_ERROR,
315 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
316 YBUG();
317 }
318 }
319
320 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
321 {
322 __u8 *blkBits = yaffs_BlockBits(dev, blk);
323
324 memset(blkBits, 0, dev->chunkBitmapStride);
325 }
326
327 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
328 {
329 __u8 *blkBits = yaffs_BlockBits(dev, blk);
330
331 yaffs_VerifyChunkBitId(dev,blk,chunk);
332
333 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
334 }
335
336 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
337 {
338 __u8 *blkBits = yaffs_BlockBits(dev, blk);
339
340 yaffs_VerifyChunkBitId(dev,blk,chunk);
341
342 blkBits[chunk / 8] |= (1 << (chunk & 7));
343 }
344
345 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
346 {
347 __u8 *blkBits = yaffs_BlockBits(dev, blk);
348 yaffs_VerifyChunkBitId(dev,blk,chunk);
349
350 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
351 }
352
353 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
354 {
355 __u8 *blkBits = yaffs_BlockBits(dev, blk);
356 int i;
357 for (i = 0; i < dev->chunkBitmapStride; i++) {
358 if (*blkBits)
359 return 1;
360 blkBits++;
361 }
362 return 0;
363 }
364
365 static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
366 {
367 __u8 *blkBits = yaffs_BlockBits(dev, blk);
368 int i;
369 int n = 0;
370 for (i = 0; i < dev->chunkBitmapStride; i++) {
371 __u8 x = *blkBits;
372 while(x){
373 if(x & 1)
374 n++;
375 x >>=1;
376 }
377
378 blkBits++;
379 }
380 return n;
381 }
382
383 /*
384 * Verification code
385 */
386
387 static int yaffs_SkipVerification(yaffs_Device *dev)
388 {
389 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
390 }
391
392 static int yaffs_SkipFullVerification(yaffs_Device *dev)
393 {
394 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
395 }
396
397 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
398 {
399 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
400 }
401
402 static const char * blockStateName[] = {
403 "Unknown",
404 "Needs scanning",
405 "Scanning",
406 "Empty",
407 "Allocating",
408 "Full",
409 "Dirty",
410 "Checkpoint",
411 "Collecting",
412 "Dead"
413 };
414
415 static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
416 {
417 int actuallyUsed;
418 int inUse;
419
420 if(yaffs_SkipVerification(dev))
421 return;
422
423 /* Report illegal runtime states */
424 if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
425 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
426
427 switch(bi->blockState){
428 case YAFFS_BLOCK_STATE_UNKNOWN:
429 case YAFFS_BLOCK_STATE_SCANNING:
430 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
431 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
432 n,blockStateName[bi->blockState]));
433 }
434
435 /* Check pages in use and soft deletions are legal */
436
437 actuallyUsed = bi->pagesInUse - bi->softDeletions;
438
439 if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
440 bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
441 actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
442 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
443 n,bi->pagesInUse,bi->softDeletions));
444
445
446 /* Check chunk bitmap legal */
447 inUse = yaffs_CountChunkBits(dev,n);
448 if(inUse != bi->pagesInUse)
449 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
450 n,bi->pagesInUse,inUse));
451
452 /* Check that the sequence number is valid.
453 * Ten million is legal, but is very unlikely
454 */
455 if(dev->isYaffs2 &&
456 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
457 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
458 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
459 n,bi->sequenceNumber));
460
461 }
462
463 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
464 {
465 yaffs_VerifyBlock(dev,bi,n);
466
467 /* After collection the block should be in the erased state */
468 /* TODO: This will need to change if we do partial gc */
469
470 if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
471 T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
472 n,bi->blockState));
473 }
474 }
475
476 static void yaffs_VerifyBlocks(yaffs_Device *dev)
477 {
478 int i;
479 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
480 int nIllegalBlockStates = 0;
481
482
483 if(yaffs_SkipVerification(dev))
484 return;
485
486 memset(nBlocksPerState,0,sizeof(nBlocksPerState));
487
488
489 for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
490 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
491 yaffs_VerifyBlock(dev,bi,i);
492
493 if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
494 nBlocksPerState[bi->blockState]++;
495 else
496 nIllegalBlockStates++;
497
498 }
499
500 T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
501 T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
502
503 T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
504 if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
505 T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
506
507 for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
508 T(YAFFS_TRACE_VERIFY,
509 (TSTR("%s %d blocks"TENDSTR),
510 blockStateName[i],nBlocksPerState[i]));
511
512 if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
513 T(YAFFS_TRACE_VERIFY,
514 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
515 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
516
517 if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
518 T(YAFFS_TRACE_VERIFY,
519 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
520 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
521
522 if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
523 T(YAFFS_TRACE_VERIFY,
524 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
525 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
526
527 T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
528
529 }
530
531 /*
532 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
533 * case those tests will not be performed.
534 */
535 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
536 {
537 if(yaffs_SkipVerification(obj->myDev))
538 return;
539
540 if(!(tags && obj && oh)){
541 T(YAFFS_TRACE_VERIFY,
542 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
543 (__u32)tags,(__u32)obj,(__u32)oh));
544 return;
545 }
546
547 if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
548 oh->type > YAFFS_OBJECT_TYPE_MAX)
549 T(YAFFS_TRACE_VERIFY,
550 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
551 tags->objectId, oh->type));
552
553 if(tags->objectId != obj->objectId)
554 T(YAFFS_TRACE_VERIFY,
555 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
556 tags->objectId, obj->objectId));
557
558
559 /*
560 * Check that the object's parent ids match if parentCheck requested.
561 *
562 * Tests do not apply to the root object.
563 */
564
565 if(parentCheck && tags->objectId > 1 && !obj->parent)
566 T(YAFFS_TRACE_VERIFY,
567 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
568 tags->objectId, oh->parentObjectId));
569
570
571 if(parentCheck && obj->parent &&
572 oh->parentObjectId != obj->parent->objectId &&
573 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
574 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
575 T(YAFFS_TRACE_VERIFY,
576 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
577 tags->objectId, oh->parentObjectId, obj->parent->objectId));
578
579
580 if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
581 T(YAFFS_TRACE_VERIFY,
582 (TSTR("Obj %d header name is NULL"TENDSTR),
583 obj->objectId));
584
585 if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
586 T(YAFFS_TRACE_VERIFY,
587 (TSTR("Obj %d header name is 0xFF"TENDSTR),
588 obj->objectId));
589 }
590
591
592
593 static int yaffs_VerifyTnodeWorker(yaffs_Object * obj, yaffs_Tnode * tn,
594 __u32 level, int chunkOffset)
595 {
596 int i;
597 yaffs_Device *dev = obj->myDev;
598 int ok = 1;
599 int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
600
601 if (tn) {
602 if (level > 0) {
603
604 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
605 if (tn->internal[i]) {
606 ok = yaffs_VerifyTnodeWorker(obj,
607 tn->internal[i],
608 level - 1,
609 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
610 }
611 }
612 } else if (level == 0) {
613 int i;
614 yaffs_ExtendedTags tags;
615 __u32 objectId = obj->objectId;
616
617 chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
618
619 for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){
620 __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
621
622 if(theChunk > 0){
623 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
624 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
625 if(tags.objectId != objectId || tags.chunkId != chunkOffset){
626 T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
627 objectId, chunkOffset, theChunk,
628 tags.objectId, tags.chunkId));
629 }
630 }
631 chunkOffset++;
632 }
633 }
634 }
635
636 return ok;
637
638 }
639
640
641 static void yaffs_VerifyFile(yaffs_Object *obj)
642 {
643 int requiredTallness;
644 int actualTallness;
645 __u32 lastChunk;
646 __u32 x;
647 __u32 i;
648 int ok;
649 yaffs_Device *dev;
650 yaffs_ExtendedTags tags;
651 yaffs_Tnode *tn;
652 __u32 objectId;
653
654 if(obj && yaffs_SkipVerification(obj->myDev))
655 return;
656
657 dev = obj->myDev;
658 objectId = obj->objectId;
659
660 /* Check file size is consistent with tnode depth */
661 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
662 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
663 requiredTallness = 0;
664 while (x> 0) {
665 x >>= YAFFS_TNODES_INTERNAL_BITS;
666 requiredTallness++;
667 }
668
669 actualTallness = obj->variant.fileVariant.topLevel;
670
671 if(requiredTallness > actualTallness )
672 T(YAFFS_TRACE_VERIFY,
673 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
674 obj->objectId,actualTallness, requiredTallness));
675
676
677 /* Check that the chunks in the tnode tree are all correct.
678 * We do this by scanning through the tnode tree and
679 * checking the tags for every chunk match.
680 */
681
682 if(yaffs_SkipNANDVerification(dev))
683 return;
684
685 for(i = 1; i <= lastChunk; i++){
686 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
687
688 if (tn) {
689 __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
690 if(theChunk > 0){
691 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
692 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
693 if(tags.objectId != objectId || tags.chunkId != i){
694 T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
695 objectId, i, theChunk,
696 tags.objectId, tags.chunkId));
697 }
698 }
699 }
700
701 }
702
703 }
704
705 static void yaffs_VerifyDirectory(yaffs_Object *obj)
706 {
707 if(obj && yaffs_SkipVerification(obj->myDev))
708 return;
709
710 }
711
712 static void yaffs_VerifyHardLink(yaffs_Object *obj)
713 {
714 if(obj && yaffs_SkipVerification(obj->myDev))
715 return;
716
717 /* Verify sane equivalent object */
718 }
719
720 static void yaffs_VerifySymlink(yaffs_Object *obj)
721 {
722 if(obj && yaffs_SkipVerification(obj->myDev))
723 return;
724
725 /* Verify symlink string */
726 }
727
728 static void yaffs_VerifySpecial(yaffs_Object *obj)
729 {
730 if(obj && yaffs_SkipVerification(obj->myDev))
731 return;
732 }
733
734 static void yaffs_VerifyObject(yaffs_Object *obj)
735 {
736 yaffs_Device *dev;
737
738 __u32 chunkMin;
739 __u32 chunkMax;
740
741 __u32 chunkIdOk;
742 __u32 chunkIsLive;
743
744 if(!obj)
745 return;
746
747 dev = obj->myDev;
748
749 if(yaffs_SkipVerification(dev))
750 return;
751
752 /* Check sane object header chunk */
753
754 chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
755 chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
756
757 chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
758 chunkIsLive = chunkIdOk &&
759 yaffs_CheckChunkBit(dev,
760 obj->chunkId / dev->nChunksPerBlock,
761 obj->chunkId % dev->nChunksPerBlock);
762 if(!obj->fake &&
763 (!chunkIdOk || !chunkIsLive)) {
764 T(YAFFS_TRACE_VERIFY,
765 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
766 obj->objectId,obj->chunkId,
767 chunkIdOk ? "" : ",out of range",
768 chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
769 }
770
771 if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
772 yaffs_ExtendedTags tags;
773 yaffs_ObjectHeader *oh;
774 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
775
776 oh = (yaffs_ObjectHeader *)buffer;
777
778 yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
779
780 yaffs_VerifyObjectHeader(obj,oh,&tags,1);
781
782 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
783 }
784
785 /* Verify it has a parent */
786 if(obj && !obj->fake &&
787 (!obj->parent || obj->parent->myDev != dev)){
788 T(YAFFS_TRACE_VERIFY,
789 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
790 obj->objectId,obj->parent));
791 }
792
793 /* Verify parent is a directory */
794 if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
795 T(YAFFS_TRACE_VERIFY,
796 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
797 obj->objectId,obj->parent->variantType));
798 }
799
800 switch(obj->variantType){
801 case YAFFS_OBJECT_TYPE_FILE:
802 yaffs_VerifyFile(obj);
803 break;
804 case YAFFS_OBJECT_TYPE_SYMLINK:
805 yaffs_VerifySymlink(obj);
806 break;
807 case YAFFS_OBJECT_TYPE_DIRECTORY:
808 yaffs_VerifyDirectory(obj);
809 break;
810 case YAFFS_OBJECT_TYPE_HARDLINK:
811 yaffs_VerifyHardLink(obj);
812 break;
813 case YAFFS_OBJECT_TYPE_SPECIAL:
814 yaffs_VerifySpecial(obj);
815 break;
816 case YAFFS_OBJECT_TYPE_UNKNOWN:
817 default:
818 T(YAFFS_TRACE_VERIFY,
819 (TSTR("Obj %d has illegaltype %d"TENDSTR),
820 obj->objectId,obj->variantType));
821 break;
822 }
823
824
825 }
826
827 static void yaffs_VerifyObjects(yaffs_Device *dev)
828 {
829 yaffs_Object *obj;
830 int i;
831 struct list_head *lh;
832
833 if(yaffs_SkipVerification(dev))
834 return;
835
836 /* Iterate through the objects in each hash entry */
837
838 for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++){
839 list_for_each(lh, &dev->objectBucket[i].list) {
840 if (lh) {
841 obj = list_entry(lh, yaffs_Object, hashLink);
842 yaffs_VerifyObject(obj);
843 }
844 }
845 }
846
847 }
848
849
850 /*
851 * Simple hash function. Needs to have a reasonable spread
852 */
853
854 static Y_INLINE int yaffs_HashFunction(int n)
855 {
856 n = abs(n);
857 return (n % YAFFS_NOBJECT_BUCKETS);
858 }
859
860 /*
861 * Access functions to useful fake objects
862 */
863
864 yaffs_Object *yaffs_Root(yaffs_Device * dev)
865 {
866 return dev->rootDir;
867 }
868
869 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
870 {
871 return dev->lostNFoundDir;
872 }
873
874
875 /*
876 * Erased NAND checking functions
877 */
878
879 int yaffs_CheckFF(__u8 * buffer, int nBytes)
880 {
881 /* Horrible, slow implementation */
882 while (nBytes--) {
883 if (*buffer != 0xFF)
884 return 0;
885 buffer++;
886 }
887 return 1;
888 }
889
890 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
891 int chunkInNAND)
892 {
893
894 int retval = YAFFS_OK;
895 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
896 yaffs_ExtendedTags tags;
897 int result;
898
899 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
900
901 if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
902 retval = YAFFS_FAIL;
903
904
905 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
906 T(YAFFS_TRACE_NANDACCESS,
907 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
908 retval = YAFFS_FAIL;
909 }
910
911 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
912
913 return retval;
914
915 }
916
917
918 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
919 const __u8 * data,
920 yaffs_ExtendedTags * tags,
921 int useReserve)
922 {
923 int attempts = 0;
924 int writeOk = 0;
925 int chunk;
926
927 yaffs_InvalidateCheckpoint(dev);
928
929 do {
930 yaffs_BlockInfo *bi = 0;
931 int erasedOk = 0;
932
933 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
934 if (chunk < 0) {
935 /* no space */
936 break;
937 }
938
939 /* First check this chunk is erased, if it needs
940 * checking. The checking policy (unless forced
941 * always on) is as follows:
942 *
943 * Check the first page we try to write in a block.
944 * If the check passes then we don't need to check any
945 * more. If the check fails, we check again...
946 * If the block has been erased, we don't need to check.
947 *
948 * However, if the block has been prioritised for gc,
949 * then we think there might be something odd about
950 * this block and stop using it.
951 *
952 * Rationale: We should only ever see chunks that have
953 * not been erased if there was a partially written
954 * chunk due to power loss. This checking policy should
955 * catch that case with very few checks and thus save a
956 * lot of checks that are most likely not needed.
957 */
958 if (bi->gcPrioritise) {
959 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
960 /* try another chunk */
961 continue;
962 }
963
964 /* let's give it a try */
965 attempts++;
966
967 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
968 bi->skipErasedCheck = 0;
969 #endif
970 if (!bi->skipErasedCheck) {
971 erasedOk = yaffs_CheckChunkErased(dev, chunk);
972 if (erasedOk != YAFFS_OK) {
973 T(YAFFS_TRACE_ERROR,
974 (TSTR ("**>> yaffs chunk %d was not erased"
975 TENDSTR), chunk));
976
977 /* try another chunk */
978 continue;
979 }
980 bi->skipErasedCheck = 1;
981 }
982
983 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
984 data, tags);
985 if (writeOk != YAFFS_OK) {
986 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
987 /* try another chunk */
988 continue;
989 }
990
991 /* Copy the data into the robustification buffer */
992 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
993
994 } while (writeOk != YAFFS_OK && attempts < yaffs_wr_attempts);
995
996 if (attempts > 1) {
997 T(YAFFS_TRACE_ERROR,
998 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
999 attempts));
1000
1001 dev->nRetriedWrites += (attempts - 1);
1002 }
1003
1004 return chunk;
1005 }
1006
1007 /*
1008 * Block retiring for handling a broken block.
1009 */
1010
1011 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
1012 {
1013 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1014
1015 yaffs_InvalidateCheckpoint(dev);
1016
1017 yaffs_MarkBlockBad(dev, blockInNAND);
1018
1019 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1020 bi->gcPrioritise = 0;
1021 bi->needsRetiring = 0;
1022
1023 dev->nRetiredBlocks++;
1024 }
1025
1026 /*
1027 * Functions for robustisizing TODO
1028 *
1029 */
1030
1031 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
1032 const __u8 * data,
1033 const yaffs_ExtendedTags * tags)
1034 {
1035 }
1036
1037 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
1038 const yaffs_ExtendedTags * tags)
1039 {
1040 }
1041
1042 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1043 {
1044 if(!bi->gcPrioritise){
1045 bi->gcPrioritise = 1;
1046 dev->hasPendingPrioritisedGCs = 1;
1047 bi->chunkErrorStrikes ++;
1048
1049 if(bi->chunkErrorStrikes > 3){
1050 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1051 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1052
1053 }
1054
1055 }
1056 }
1057
1058 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
1059 {
1060
1061 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1062 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1063
1064 yaffs_HandleChunkError(dev,bi);
1065
1066
1067 if(erasedOk ) {
1068 /* Was an actual write failure, so mark the block for retirement */
1069 bi->needsRetiring = 1;
1070 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1071 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1072
1073
1074 }
1075
1076 /* Delete the chunk */
1077 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1078 }
1079
1080
1081 /*---------------- Name handling functions ------------*/
1082
1083 static __u16 yaffs_CalcNameSum(const YCHAR * name)
1084 {
1085 __u16 sum = 0;
1086 __u16 i = 1;
1087
1088 YUCHAR *bname = (YUCHAR *) name;
1089 if (bname) {
1090 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1091
1092 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1093 sum += yaffs_toupper(*bname) * i;
1094 #else
1095 sum += (*bname) * i;
1096 #endif
1097 i++;
1098 bname++;
1099 }
1100 }
1101 return sum;
1102 }
1103
1104 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
1105 {
1106 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1107 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
1108 yaffs_strcpy(obj->shortName, name);
1109 } else {
1110 obj->shortName[0] = _Y('\0');
1111 }
1112 #endif
1113 obj->sum = yaffs_CalcNameSum(name);
1114 }
1115
1116 /*-------------------- TNODES -------------------
1117
1118 * List of spare tnodes
1119 * The list is hooked together using the first pointer
1120 * in the tnode.
1121 */
1122
1123 /* yaffs_CreateTnodes creates a bunch more tnodes and
1124 * adds them to the tnode free list.
1125 * Don't use this function directly
1126 */
1127
1128 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
1129 {
1130 int i;
1131 int tnodeSize;
1132 yaffs_Tnode *newTnodes;
1133 __u8 *mem;
1134 yaffs_Tnode *curr;
1135 yaffs_Tnode *next;
1136 yaffs_TnodeList *tnl;
1137
1138 if (nTnodes < 1)
1139 return YAFFS_OK;
1140
1141 /* Calculate the tnode size in bytes for variable width tnode support.
1142 * Must be a multiple of 32-bits */
1143 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1144
1145 /* make these things */
1146
1147 newTnodes = YMALLOC(nTnodes * tnodeSize);
1148 mem = (__u8 *)newTnodes;
1149
1150 if (!newTnodes) {
1151 T(YAFFS_TRACE_ERROR,
1152 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1153 return YAFFS_FAIL;
1154 }
1155
1156 /* Hook them into the free list */
1157 #if 0
1158 for (i = 0; i < nTnodes - 1; i++) {
1159 newTnodes[i].internal[0] = &newTnodes[i + 1];
1160 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1161 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1162 #endif
1163 }
1164
1165 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1166 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1167 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1168 #endif
1169 dev->freeTnodes = newTnodes;
1170 #else
1171 /* New hookup for wide tnodes */
1172 for(i = 0; i < nTnodes -1; i++) {
1173 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1174 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1175 curr->internal[0] = next;
1176 }
1177
1178 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1179 curr->internal[0] = dev->freeTnodes;
1180 dev->freeTnodes = (yaffs_Tnode *)mem;
1181
1182 #endif
1183
1184
1185 dev->nFreeTnodes += nTnodes;
1186 dev->nTnodesCreated += nTnodes;
1187
1188 /* Now add this bunch of tnodes to a list for freeing up.
1189 * NB If we can't add this to the management list it isn't fatal
1190 * but it just means we can't free this bunch of tnodes later.
1191 */
1192
1193 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1194 if (!tnl) {
1195 T(YAFFS_TRACE_ERROR,
1196 (TSTR
1197 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1198 return YAFFS_FAIL;
1199
1200 } else {
1201 tnl->tnodes = newTnodes;
1202 tnl->next = dev->allocatedTnodeList;
1203 dev->allocatedTnodeList = tnl;
1204 }
1205
1206 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1207
1208 return YAFFS_OK;
1209 }
1210
1211 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1212
1213 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
1214 {
1215 yaffs_Tnode *tn = NULL;
1216
1217 /* If there are none left make more */
1218 if (!dev->freeTnodes) {
1219 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1220 }
1221
1222 if (dev->freeTnodes) {
1223 tn = dev->freeTnodes;
1224 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1225 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1226 /* Hoosterman, this thing looks like it isn't in the list */
1227 T(YAFFS_TRACE_ALWAYS,
1228 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1229 }
1230 #endif
1231 dev->freeTnodes = dev->freeTnodes->internal[0];
1232 dev->nFreeTnodes--;
1233 }
1234
1235 return tn;
1236 }
1237
1238 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
1239 {
1240 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1241
1242 if(tn)
1243 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1244
1245 return tn;
1246 }
1247
1248 /* FreeTnode frees up a tnode and puts it back on the free list */
1249 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
1250 {
1251 if (tn) {
1252 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1253 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1254 /* Hoosterman, this thing looks like it is already in the list */
1255 T(YAFFS_TRACE_ALWAYS,
1256 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1257 }
1258 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1259 #endif
1260 tn->internal[0] = dev->freeTnodes;
1261 dev->freeTnodes = tn;
1262 dev->nFreeTnodes++;
1263 }
1264 }
1265
1266 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
1267 {
1268 /* Free the list of allocated tnodes */
1269 yaffs_TnodeList *tmp;
1270
1271 while (dev->allocatedTnodeList) {
1272 tmp = dev->allocatedTnodeList->next;
1273
1274 YFREE(dev->allocatedTnodeList->tnodes);
1275 YFREE(dev->allocatedTnodeList);
1276 dev->allocatedTnodeList = tmp;
1277
1278 }
1279
1280 dev->freeTnodes = NULL;
1281 dev->nFreeTnodes = 0;
1282 }
1283
1284 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
1285 {
1286 dev->allocatedTnodeList = NULL;
1287 dev->freeTnodes = NULL;
1288 dev->nFreeTnodes = 0;
1289 dev->nTnodesCreated = 0;
1290
1291 }
1292
1293
1294 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
1295 {
1296 __u32 *map = (__u32 *)tn;
1297 __u32 bitInMap;
1298 __u32 bitInWord;
1299 __u32 wordInMap;
1300 __u32 mask;
1301
1302 pos &= YAFFS_TNODES_LEVEL0_MASK;
1303 val >>= dev->chunkGroupBits;
1304
1305 bitInMap = pos * dev->tnodeWidth;
1306 wordInMap = bitInMap /32;
1307 bitInWord = bitInMap & (32 -1);
1308
1309 mask = dev->tnodeMask << bitInWord;
1310
1311 map[wordInMap] &= ~mask;
1312 map[wordInMap] |= (mask & (val << bitInWord));
1313
1314 if(dev->tnodeWidth > (32-bitInWord)) {
1315 bitInWord = (32 - bitInWord);
1316 wordInMap++;;
1317 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1318 map[wordInMap] &= ~mask;
1319 map[wordInMap] |= (mask & (val >> bitInWord));
1320 }
1321 }
1322
1323 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
1324 {
1325 __u32 *map = (__u32 *)tn;
1326 __u32 bitInMap;
1327 __u32 bitInWord;
1328 __u32 wordInMap;
1329 __u32 val;
1330
1331 pos &= YAFFS_TNODES_LEVEL0_MASK;
1332
1333 bitInMap = pos * dev->tnodeWidth;
1334 wordInMap = bitInMap /32;
1335 bitInWord = bitInMap & (32 -1);
1336
1337 val = map[wordInMap] >> bitInWord;
1338
1339 if(dev->tnodeWidth > (32-bitInWord)) {
1340 bitInWord = (32 - bitInWord);
1341 wordInMap++;;
1342 val |= (map[wordInMap] << bitInWord);
1343 }
1344
1345 val &= dev->tnodeMask;
1346 val <<= dev->chunkGroupBits;
1347
1348 return val;
1349 }
1350
1351 /* ------------------- End of individual tnode manipulation -----------------*/
1352
1353 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1354 * The look up tree is represented by the top tnode and the number of topLevel
1355 * in the tree. 0 means only the level 0 tnode is in the tree.
1356 */
1357
1358 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1359 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
1360 yaffs_FileStructure * fStruct,
1361 __u32 chunkId)
1362 {
1363
1364 yaffs_Tnode *tn = fStruct->top;
1365 __u32 i;
1366 int requiredTallness;
1367 int level = fStruct->topLevel;
1368
1369 /* Check sane level and chunk Id */
1370 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
1371 return NULL;
1372 }
1373
1374 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1375 return NULL;
1376 }
1377
1378 /* First check we're tall enough (ie enough topLevel) */
1379
1380 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1381 requiredTallness = 0;
1382 while (i) {
1383 i >>= YAFFS_TNODES_INTERNAL_BITS;
1384 requiredTallness++;
1385 }
1386
1387 if (requiredTallness > fStruct->topLevel) {
1388 /* Not tall enough, so we can't find it, return NULL. */
1389 return NULL;
1390 }
1391
1392 /* Traverse down to level 0 */
1393 while (level > 0 && tn) {
1394 tn = tn->
1395 internal[(chunkId >>
1396 ( YAFFS_TNODES_LEVEL0_BITS +
1397 (level - 1) *
1398 YAFFS_TNODES_INTERNAL_BITS)
1399 ) &
1400 YAFFS_TNODES_INTERNAL_MASK];
1401 level--;
1402
1403 }
1404
1405 return tn;
1406 }
1407
1408 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1409 * This happens in two steps:
1410 * 1. If the tree isn't tall enough, then make it taller.
1411 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1412 *
1413 * Used when modifying the tree.
1414 *
1415 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1416 * be plugged into the ttree.
1417 */
1418
1419 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
1420 yaffs_FileStructure * fStruct,
1421 __u32 chunkId,
1422 yaffs_Tnode *passedTn)
1423 {
1424
1425 int requiredTallness;
1426 int i;
1427 int l;
1428 yaffs_Tnode *tn;
1429
1430 __u32 x;
1431
1432
1433 /* Check sane level and page Id */
1434 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
1435 return NULL;
1436 }
1437
1438 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1439 return NULL;
1440 }
1441
1442 /* First check we're tall enough (ie enough topLevel) */
1443
1444 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1445 requiredTallness = 0;
1446 while (x) {
1447 x >>= YAFFS_TNODES_INTERNAL_BITS;
1448 requiredTallness++;
1449 }
1450
1451
1452 if (requiredTallness > fStruct->topLevel) {
1453 /* Not tall enough,gotta make the tree taller */
1454 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1455
1456 tn = yaffs_GetTnode(dev);
1457
1458 if (tn) {
1459 tn->internal[0] = fStruct->top;
1460 fStruct->top = tn;
1461 } else {
1462 T(YAFFS_TRACE_ERROR,
1463 (TSTR("yaffs: no more tnodes" TENDSTR)));
1464 }
1465 }
1466
1467 fStruct->topLevel = requiredTallness;
1468 }
1469
1470 /* Traverse down to level 0, adding anything we need */
1471
1472 l = fStruct->topLevel;
1473 tn = fStruct->top;
1474
1475 if(l > 0) {
1476 while (l > 0 && tn) {
1477 x = (chunkId >>
1478 ( YAFFS_TNODES_LEVEL0_BITS +
1479 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1480 YAFFS_TNODES_INTERNAL_MASK;
1481
1482
1483 if((l>1) && !tn->internal[x]){
1484 /* Add missing non-level-zero tnode */
1485 tn->internal[x] = yaffs_GetTnode(dev);
1486
1487 } else if(l == 1) {
1488 /* Looking from level 1 at level 0 */
1489 if (passedTn) {
1490 /* If we already have one, then release it.*/
1491 if(tn->internal[x])
1492 yaffs_FreeTnode(dev,tn->internal[x]);
1493 tn->internal[x] = passedTn;
1494
1495 } else if(!tn->internal[x]) {
1496 /* Don't have one, none passed in */
1497 tn->internal[x] = yaffs_GetTnode(dev);
1498 }
1499 }
1500
1501 tn = tn->internal[x];
1502 l--;
1503 }
1504 } else {
1505 /* top is level 0 */
1506 if(passedTn) {
1507 memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1508 yaffs_FreeTnode(dev,passedTn);
1509 }
1510 }
1511
1512 return tn;
1513 }
1514
1515 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
1516 yaffs_ExtendedTags * tags, int objectId,
1517 int chunkInInode)
1518 {
1519 int j;
1520
1521 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1522 if (yaffs_CheckChunkBit
1523 (dev, theChunk / dev->nChunksPerBlock,
1524 theChunk % dev->nChunksPerBlock)) {
1525 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1526 tags);
1527 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1528 /* found it; */
1529 return theChunk;
1530
1531 }
1532 }
1533 theChunk++;
1534 }
1535 return -1;
1536 }
1537
1538
1539 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1540 * chunks and tnodes in the file
1541 * Returns 1 if the tree was deleted.
1542 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1543 */
1544
1545 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
1546 int chunkOffset, int *limit)
1547 {
1548 int i;
1549 int chunkInInode;
1550 int theChunk;
1551 yaffs_ExtendedTags tags;
1552 int foundChunk;
1553 yaffs_Device *dev = in->myDev;
1554
1555 int allDone = 1;
1556
1557 if (tn) {
1558 if (level > 0) {
1559
1560 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1561 i--) {
1562 if (tn->internal[i]) {
1563 if (limit && (*limit) < 0) {
1564 allDone = 0;
1565 } else {
1566 allDone =
1567 yaffs_DeleteWorker(in,
1568 tn->
1569 internal
1570 [i],
1571 level -
1572 1,
1573 (chunkOffset
1574 <<
1575 YAFFS_TNODES_INTERNAL_BITS)
1576 + i,
1577 limit);
1578 }
1579 if (allDone) {
1580 yaffs_FreeTnode(dev,
1581 tn->
1582 internal[i]);
1583 tn->internal[i] = NULL;
1584 }
1585 }
1586
1587 }
1588 return (allDone) ? 1 : 0;
1589 } else if (level == 0) {
1590 int hitLimit = 0;
1591
1592 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1593 i--) {
1594 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1595 if (theChunk) {
1596
1597 chunkInInode =
1598 (chunkOffset <<
1599 YAFFS_TNODES_LEVEL0_BITS) + i;
1600
1601 foundChunk =
1602 yaffs_FindChunkInGroup(dev,
1603 theChunk,
1604 &tags,
1605 in->objectId,
1606 chunkInInode);
1607
1608 if (foundChunk > 0) {
1609 yaffs_DeleteChunk(dev,
1610 foundChunk, 1,
1611 __LINE__);
1612 in->nDataChunks--;
1613 if (limit) {
1614 *limit = *limit - 1;
1615 if (*limit <= 0) {
1616 hitLimit = 1;
1617 }
1618 }
1619
1620 }
1621
1622 yaffs_PutLevel0Tnode(dev,tn,i,0);
1623 }
1624
1625 }
1626 return (i < 0) ? 1 : 0;
1627
1628 }
1629
1630 }
1631
1632 return 1;
1633
1634 }
1635
1636 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1637 {
1638
1639 yaffs_BlockInfo *theBlock;
1640
1641 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1642
1643 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1644 if (theBlock) {
1645 theBlock->softDeletions++;
1646 dev->nFreeChunks++;
1647 }
1648 }
1649
1650 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1651 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1652 * of the tnode.
1653 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1654 */
1655
1656 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1657 __u32 level, int chunkOffset)
1658 {
1659 int i;
1660 int theChunk;
1661 int allDone = 1;
1662 yaffs_Device *dev = in->myDev;
1663
1664 if (tn) {
1665 if (level > 0) {
1666
1667 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1668 i--) {
1669 if (tn->internal[i]) {
1670 allDone =
1671 yaffs_SoftDeleteWorker(in,
1672 tn->
1673 internal[i],
1674 level - 1,
1675 (chunkOffset
1676 <<
1677 YAFFS_TNODES_INTERNAL_BITS)
1678 + i);
1679 if (allDone) {
1680 yaffs_FreeTnode(dev,
1681 tn->
1682 internal[i]);
1683 tn->internal[i] = NULL;
1684 } else {
1685 /* Hoosterman... how could this happen? */
1686 }
1687 }
1688 }
1689 return (allDone) ? 1 : 0;
1690 } else if (level == 0) {
1691
1692 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1693 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1694 if (theChunk) {
1695 /* Note this does not find the real chunk, only the chunk group.
1696 * We make an assumption that a chunk group is not larger than
1697 * a block.
1698 */
1699 yaffs_SoftDeleteChunk(dev, theChunk);
1700 yaffs_PutLevel0Tnode(dev,tn,i,0);
1701 }
1702
1703 }
1704 return 1;
1705
1706 }
1707
1708 }
1709
1710 return 1;
1711
1712 }
1713
1714 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1715 {
1716 if (obj->deleted &&
1717 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1718 if (obj->nDataChunks <= 0) {
1719 /* Empty file with no duplicate object headers, just delete it immediately */
1720 yaffs_FreeTnode(obj->myDev,
1721 obj->variant.fileVariant.top);
1722 obj->variant.fileVariant.top = NULL;
1723 T(YAFFS_TRACE_TRACING,
1724 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1725 obj->objectId));
1726 yaffs_DoGenericObjectDeletion(obj);
1727 } else {
1728 yaffs_SoftDeleteWorker(obj,
1729 obj->variant.fileVariant.top,
1730 obj->variant.fileVariant.
1731 topLevel, 0);
1732 obj->softDeleted = 1;
1733 }
1734 }
1735 }
1736
1737 /* Pruning removes any part of the file structure tree that is beyond the
1738 * bounds of the file (ie that does not point to chunks).
1739 *
1740 * A file should only get pruned when its size is reduced.
1741 *
1742 * Before pruning, the chunks must be pulled from the tree and the
1743 * level 0 tnode entries must be zeroed out.
1744 * Could also use this for file deletion, but that's probably better handled
1745 * by a special case.
1746 */
1747
1748 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1749 __u32 level, int del0)
1750 {
1751 int i;
1752 int hasData;
1753
1754 if (tn) {
1755 hasData = 0;
1756
1757 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1758 if (tn->internal[i] && level > 0) {
1759 tn->internal[i] =
1760 yaffs_PruneWorker(dev, tn->internal[i],
1761 level - 1,
1762 (i == 0) ? del0 : 1);
1763 }
1764
1765 if (tn->internal[i]) {
1766 hasData++;
1767 }
1768 }
1769
1770 if (hasData == 0 && del0) {
1771 /* Free and return NULL */
1772
1773 yaffs_FreeTnode(dev, tn);
1774 tn = NULL;
1775 }
1776
1777 }
1778
1779 return tn;
1780
1781 }
1782
1783 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1784 yaffs_FileStructure * fStruct)
1785 {
1786 int i;
1787 int hasData;
1788 int done = 0;
1789 yaffs_Tnode *tn;
1790
1791 if (fStruct->topLevel > 0) {
1792 fStruct->top =
1793 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1794
1795 /* Now we have a tree with all the non-zero branches NULL but the height
1796 * is the same as it was.
1797 * Let's see if we can trim internal tnodes to shorten the tree.
1798 * We can do this if only the 0th element in the tnode is in use
1799 * (ie all the non-zero are NULL)
1800 */
1801
1802 while (fStruct->topLevel && !done) {
1803 tn = fStruct->top;
1804
1805 hasData = 0;
1806 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1807 if (tn->internal[i]) {
1808 hasData++;
1809 }
1810 }
1811
1812 if (!hasData) {
1813 fStruct->top = tn->internal[0];
1814 fStruct->topLevel--;
1815 yaffs_FreeTnode(dev, tn);
1816 } else {
1817 done = 1;
1818 }
1819 }
1820 }
1821
1822 return YAFFS_OK;
1823 }
1824
1825 /*-------------------- End of File Structure functions.-------------------*/
1826
1827 /* yaffs_CreateFreeObjects creates a bunch more objects and
1828 * adds them to the object free list.
1829 */
1830 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1831 {
1832 int i;
1833 yaffs_Object *newObjects;
1834 yaffs_ObjectList *list;
1835
1836 if (nObjects < 1)
1837 return YAFFS_OK;
1838
1839 /* make these things */
1840 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1841 list = YMALLOC(sizeof(yaffs_ObjectList));
1842
1843 if (!newObjects || !list) {
1844 if(newObjects)
1845 YFREE(newObjects);
1846 if(list)
1847 YFREE(list);
1848 T(YAFFS_TRACE_ALLOCATE,
1849 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1850 return YAFFS_FAIL;
1851 }
1852
1853 /* Hook them into the free list */
1854 for (i = 0; i < nObjects - 1; i++) {
1855 newObjects[i].siblings.next =
1856 (struct list_head *)(&newObjects[i + 1]);
1857 }
1858
1859 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1860 dev->freeObjects = newObjects;
1861 dev->nFreeObjects += nObjects;
1862 dev->nObjectsCreated += nObjects;
1863
1864 /* Now add this bunch of Objects to a list for freeing up. */
1865
1866 list->objects = newObjects;
1867 list->next = dev->allocatedObjectList;
1868 dev->allocatedObjectList = list;
1869
1870 return YAFFS_OK;
1871 }
1872
1873
1874 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1875 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1876 {
1877 yaffs_Object *tn = NULL;
1878
1879 /* If there are none left make more */
1880 if (!dev->freeObjects) {
1881 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1882 }
1883
1884 if (dev->freeObjects) {
1885 tn = dev->freeObjects;
1886 dev->freeObjects =
1887 (yaffs_Object *) (dev->freeObjects->siblings.next);
1888 dev->nFreeObjects--;
1889
1890 /* Now sweeten it up... */
1891
1892 memset(tn, 0, sizeof(yaffs_Object));
1893 tn->myDev = dev;
1894 tn->chunkId = -1;
1895 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1896 INIT_LIST_HEAD(&(tn->hardLinks));
1897 INIT_LIST_HEAD(&(tn->hashLink));
1898 INIT_LIST_HEAD(&tn->siblings);
1899
1900 /* Add it to the lost and found directory.
1901 * NB Can't put root or lostNFound in lostNFound so
1902 * check if lostNFound exists first
1903 */
1904 if (dev->lostNFoundDir) {
1905 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1906 }
1907 }
1908
1909 return tn;
1910 }
1911
1912 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1913 __u32 mode)
1914 {
1915
1916 yaffs_Object *obj =
1917 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1918 if (obj) {
1919 obj->fake = 1; /* it is fake so it has no NAND presence... */
1920 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1921 obj->unlinkAllowed = 0; /* ... or unlink it */
1922 obj->deleted = 0;
1923 obj->unlinked = 0;
1924 obj->yst_mode = mode;
1925 obj->myDev = dev;
1926 obj->chunkId = 0; /* Not a valid chunk. */
1927 }
1928
1929 return obj;
1930
1931 }
1932
1933 static void yaffs_UnhashObject(yaffs_Object * tn)
1934 {
1935 int bucket;
1936 yaffs_Device *dev = tn->myDev;
1937
1938 /* If it is still linked into the bucket list, free from the list */
1939 if (!list_empty(&tn->hashLink)) {
1940 list_del_init(&tn->hashLink);
1941 bucket = yaffs_HashFunction(tn->objectId);
1942 dev->objectBucket[bucket].count--;
1943 }
1944
1945 }
1946
1947 /* FreeObject frees up a Object and puts it back on the free list */
1948 static void yaffs_FreeObject(yaffs_Object * tn)
1949 {
1950
1951 yaffs_Device *dev = tn->myDev;
1952
1953 #ifdef __KERNEL__
1954 if (tn->myInode) {
1955 /* We're still hooked up to a cached inode.
1956 * Don't delete now, but mark for later deletion
1957 */
1958 tn->deferedFree = 1;
1959 return;
1960 }
1961 #endif
1962
1963 yaffs_UnhashObject(tn);
1964
1965 /* Link into the free list. */
1966 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1967 dev->freeObjects = tn;
1968 dev->nFreeObjects++;
1969 }
1970
1971 #ifdef __KERNEL__
1972
1973 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1974 {
1975 if (obj->deferedFree) {
1976 yaffs_FreeObject(obj);
1977 }
1978 }
1979
1980 #endif
1981
1982 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1983 {
1984 /* Free the list of allocated Objects */
1985
1986 yaffs_ObjectList *tmp;
1987
1988 while (dev->allocatedObjectList) {
1989 tmp = dev->allocatedObjectList->next;
1990 YFREE(dev->allocatedObjectList->objects);
1991 YFREE(dev->allocatedObjectList);
1992
1993 dev->allocatedObjectList = tmp;
1994 }
1995
1996 dev->freeObjects = NULL;
1997 dev->nFreeObjects = 0;
1998 }
1999
2000 static void yaffs_InitialiseObjects(yaffs_Device * dev)
2001 {
2002 int i;
2003
2004 dev->allocatedObjectList = NULL;
2005 dev->freeObjects = NULL;
2006 dev->nFreeObjects = 0;
2007
2008 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2009 INIT_LIST_HEAD(&dev->objectBucket[i].list);
2010 dev->objectBucket[i].count = 0;
2011 }
2012
2013 }
2014
2015 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
2016 {
2017 static int x = 0;
2018 int i;
2019 int l = 999;
2020 int lowest = 999999;
2021
2022 /* First let's see if we can find one that's empty. */
2023
2024 for (i = 0; i < 10 && lowest > 0; i++) {
2025 x++;
2026 x %= YAFFS_NOBJECT_BUCKETS;
2027 if (dev->objectBucket[x].count < lowest) {
2028 lowest = dev->objectBucket[x].count;
2029 l = x;
2030 }
2031
2032 }
2033
2034 /* If we didn't find an empty list, then try
2035 * looking a bit further for a short one
2036 */
2037
2038 for (i = 0; i < 10 && lowest > 3; i++) {
2039 x++;
2040 x %= YAFFS_NOBJECT_BUCKETS;
2041 if (dev->objectBucket[x].count < lowest) {
2042 lowest = dev->objectBucket[x].count;
2043 l = x;
2044 }
2045
2046 }
2047
2048 return l;
2049 }
2050
2051 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
2052 {
2053 int bucket = yaffs_FindNiceObjectBucket(dev);
2054
2055 /* Now find an object value that has not already been taken
2056 * by scanning the list.
2057 */
2058
2059 int found = 0;
2060 struct list_head *i;
2061
2062 __u32 n = (__u32) bucket;
2063
2064 /* yaffs_CheckObjectHashSanity(); */
2065
2066 while (!found) {
2067 found = 1;
2068 n += YAFFS_NOBJECT_BUCKETS;
2069 if (1 || dev->objectBucket[bucket].count > 0) {
2070 list_for_each(i, &dev->objectBucket[bucket].list) {
2071 /* If there is already one in the list */
2072 if (i
2073 && list_entry(i, yaffs_Object,
2074 hashLink)->objectId == n) {
2075 found = 0;
2076 }
2077 }
2078 }
2079 }
2080
2081
2082 return n;
2083 }
2084
2085 static void yaffs_HashObject(yaffs_Object * in)
2086 {
2087 int bucket = yaffs_HashFunction(in->objectId);
2088 yaffs_Device *dev = in->myDev;
2089
2090 list_add(&in->hashLink, &dev->objectBucket[bucket].list);
2091 dev->objectBucket[bucket].count++;
2092
2093 }
2094
2095 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
2096 {
2097 int bucket = yaffs_HashFunction(number);
2098 struct list_head *i;
2099 yaffs_Object *in;
2100
2101 list_for_each(i, &dev->objectBucket[bucket].list) {
2102 /* Look if it is in the list */
2103 if (i) {
2104 in = list_entry(i, yaffs_Object, hashLink);
2105 if (in->objectId == number) {
2106 #ifdef __KERNEL__
2107 /* Don't tell the VFS about this one if it is defered free */
2108 if (in->deferedFree)
2109 return NULL;
2110 #endif
2111
2112 return in;
2113 }
2114 }
2115 }
2116
2117 return NULL;
2118 }
2119
2120 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
2121 yaffs_ObjectType type)
2122 {
2123
2124 yaffs_Object *theObject;
2125 yaffs_Tnode *tn;
2126
2127 if (number < 0) {
2128 number = yaffs_CreateNewObjectNumber(dev);
2129 }
2130
2131 theObject = yaffs_AllocateEmptyObject(dev);
2132 if(!theObject)
2133 return NULL;
2134
2135 if(type == YAFFS_OBJECT_TYPE_FILE){
2136 tn = yaffs_GetTnode(dev);
2137 if(!tn){
2138 yaffs_FreeObject(theObject);
2139 return NULL;
2140 }
2141 }
2142
2143
2144
2145 if (theObject) {
2146 theObject->fake = 0;
2147 theObject->renameAllowed = 1;
2148 theObject->unlinkAllowed = 1;
2149 theObject->objectId = number;
2150 yaffs_HashObject(theObject);
2151 theObject->variantType = type;
2152 #ifdef CONFIG_YAFFS_WINCE
2153 yfsd_WinFileTimeNow(theObject->win_atime);
2154 theObject->win_ctime[0] = theObject->win_mtime[0] =
2155 theObject->win_atime[0];
2156 theObject->win_ctime[1] = theObject->win_mtime[1] =
2157 theObject->win_atime[1];
2158
2159 #else
2160
2161 theObject->yst_atime = theObject->yst_mtime =
2162 theObject->yst_ctime = Y_CURRENT_TIME;
2163 #endif
2164 switch (type) {
2165 case YAFFS_OBJECT_TYPE_FILE:
2166 theObject->variant.fileVariant.fileSize = 0;
2167 theObject->variant.fileVariant.scannedFileSize = 0;
2168 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2169 theObject->variant.fileVariant.topLevel = 0;
2170 theObject->variant.fileVariant.top = tn;
2171 break;
2172 case YAFFS_OBJECT_TYPE_DIRECTORY:
2173 INIT_LIST_HEAD(&theObject->variant.directoryVariant.
2174 children);
2175 break;
2176 case YAFFS_OBJECT_TYPE_SYMLINK:
2177 case YAFFS_OBJECT_TYPE_HARDLINK:
2178 case YAFFS_OBJECT_TYPE_SPECIAL:
2179 /* No action required */
2180 break;
2181 case YAFFS_OBJECT_TYPE_UNKNOWN:
2182 /* todo this should not happen */
2183 break;
2184 }
2185 }
2186
2187 return theObject;
2188 }
2189
2190 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
2191 int number,
2192 yaffs_ObjectType type)
2193 {
2194 yaffs_Object *theObject = NULL;
2195
2196 if (number > 0) {
2197 theObject = yaffs_FindObjectByNumber(dev, number);
2198 }
2199
2200 if (!theObject) {
2201 theObject = yaffs_CreateNewObject(dev, number, type);
2202 }
2203
2204 return theObject;
2205
2206 }
2207
2208
2209 static YCHAR *yaffs_CloneString(const YCHAR * str)
2210 {
2211 YCHAR *newStr = NULL;
2212
2213 if (str && *str) {
2214 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2215 if(newStr)
2216 yaffs_strcpy(newStr, str);
2217 }
2218
2219 return newStr;
2220
2221 }
2222
2223 /*
2224 * Mknod (create) a new object.
2225 * equivalentObject only has meaning for a hard link;
2226 * aliasString only has meaning for a sumlink.
2227 * rdev only has meaning for devices (a subset of special objects)
2228 */
2229
2230 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2231 yaffs_Object * parent,
2232 const YCHAR * name,
2233 __u32 mode,
2234 __u32 uid,
2235 __u32 gid,
2236 yaffs_Object * equivalentObject,
2237 const YCHAR * aliasString, __u32 rdev)
2238 {
2239 yaffs_Object *in;
2240 YCHAR *str;
2241
2242 yaffs_Device *dev = parent->myDev;
2243
2244 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2245 if (yaffs_FindObjectByName(parent, name)) {
2246 return NULL;
2247 }
2248
2249 in = yaffs_CreateNewObject(dev, -1, type);
2250
2251 if(type == YAFFS_OBJECT_TYPE_SYMLINK){
2252 str = yaffs_CloneString(aliasString);
2253 if(!str){
2254 yaffs_FreeObject(in);
2255 return NULL;
2256 }
2257 }
2258
2259
2260
2261 if (in) {
2262 in->chunkId = -1;
2263 in->valid = 1;
2264 in->variantType = type;
2265
2266 in->yst_mode = mode;
2267
2268 #ifdef CONFIG_YAFFS_WINCE
2269 yfsd_WinFileTimeNow(in->win_atime);
2270 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2271 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2272
2273 #else
2274 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2275
2276 in->yst_rdev = rdev;
2277 in->yst_uid = uid;
2278 in->yst_gid = gid;
2279 #endif
2280 in->nDataChunks = 0;
2281
2282 yaffs_SetObjectName(in, name);
2283 in->dirty = 1;
2284
2285 yaffs_AddObjectToDirectory(parent, in);
2286
2287 in->myDev = parent->myDev;
2288
2289 switch (type) {
2290 case YAFFS_OBJECT_TYPE_SYMLINK:
2291 in->variant.symLinkVariant.alias = str;
2292 break;
2293 case YAFFS_OBJECT_TYPE_HARDLINK:
2294 in->variant.hardLinkVariant.equivalentObject =
2295 equivalentObject;
2296 in->variant.hardLinkVariant.equivalentObjectId =
2297 equivalentObject->objectId;
2298 list_add(&in->hardLinks, &equivalentObject->hardLinks);
2299 break;
2300 case YAFFS_OBJECT_TYPE_FILE:
2301 case YAFFS_OBJECT_TYPE_DIRECTORY:
2302 case YAFFS_OBJECT_TYPE_SPECIAL:
2303 case YAFFS_OBJECT_TYPE_UNKNOWN:
2304 /* do nothing */
2305 break;
2306 }
2307
2308 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2309 /* Could not create the object header, fail the creation */
2310 yaffs_DestroyObject(in);
2311 in = NULL;
2312 }
2313
2314 }
2315
2316 return in;
2317 }
2318
2319 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
2320 __u32 mode, __u32 uid, __u32 gid)
2321 {
2322 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2323 uid, gid, NULL, NULL, 0);
2324 }
2325
2326 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
2327 __u32 mode, __u32 uid, __u32 gid)
2328 {
2329 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2330 mode, uid, gid, NULL, NULL, 0);
2331 }
2332
2333 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
2334 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2335 {
2336 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2337 uid, gid, NULL, NULL, rdev);
2338 }
2339
2340 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
2341 __u32 mode, __u32 uid, __u32 gid,
2342 const YCHAR * alias)
2343 {
2344 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2345 uid, gid, NULL, alias, 0);
2346 }
2347
2348 /* yaffs_Link returns the object id of the equivalent object.*/
2349 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
2350 yaffs_Object * equivalentObject)
2351 {
2352 /* Get the real object in case we were fed a hard link as an equivalent object */
2353 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2354
2355 if (yaffs_MknodObject
2356 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2357 equivalentObject, NULL, 0)) {
2358 return equivalentObject;
2359 } else {
2360 return NULL;
2361 }
2362
2363 }
2364
2365 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
2366 const YCHAR * newName, int force, int shadows)
2367 {
2368 int unlinkOp;
2369 int deleteOp;
2370
2371 yaffs_Object *existingTarget;
2372
2373 if (newDir == NULL) {
2374 newDir = obj->parent; /* use the old directory */
2375 }
2376
2377 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2378 T(YAFFS_TRACE_ALWAYS,
2379 (TSTR
2380 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
2381 TENDSTR)));
2382 YBUG();
2383 }
2384
2385 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2386 if (obj->myDev->isYaffs2) {
2387 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2388 } else {
2389 unlinkOp = (newDir == obj->myDev->unlinkedDir
2390 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2391 }
2392
2393 deleteOp = (newDir == obj->myDev->deletedDir);
2394
2395 existingTarget = yaffs_FindObjectByName(newDir, newName);
2396
2397 /* If the object is a file going into the unlinked directory,
2398 * then it is OK to just stuff it in since duplicate names are allowed.
2399 * else only proceed if the new name does not exist and if we're putting
2400 * it into a directory.
2401 */
2402 if ((unlinkOp ||
2403 deleteOp ||
2404 force ||
2405 (shadows > 0) ||
2406 !existingTarget) &&
2407 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2408 yaffs_SetObjectName(obj, newName);
2409 obj->dirty = 1;
2410
2411 yaffs_AddObjectToDirectory(newDir, obj);
2412
2413 if (unlinkOp)
2414 obj->unlinked = 1;
2415
2416 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2417 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
2418 return YAFFS_OK;
2419 }
2420
2421 return YAFFS_FAIL;
2422 }
2423
2424 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
2425 yaffs_Object * newDir, const YCHAR * newName)
2426 {
2427 yaffs_Object *obj;
2428 yaffs_Object *existingTarget;
2429 int force = 0;
2430
2431 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2432 /* Special case for case insemsitive systems (eg. WinCE).
2433 * While look-up is case insensitive, the name isn't.
2434 * Therefore we might want to change x.txt to X.txt
2435 */
2436 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
2437 force = 1;
2438 }
2439 #endif
2440
2441 obj = yaffs_FindObjectByName(oldDir, oldName);
2442 /* Check new name to long. */
2443 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
2444 yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
2445 /* ENAMETOOLONG */
2446 return YAFFS_FAIL;
2447 else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
2448 yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2449 /* ENAMETOOLONG */
2450 return YAFFS_FAIL;
2451
2452 if (obj && obj->renameAllowed) {
2453
2454 /* Now do the handling for an existing target, if there is one */
2455
2456 existingTarget = yaffs_FindObjectByName(newDir, newName);
2457 if (existingTarget &&
2458 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2459 !list_empty(&existingTarget->variant.directoryVariant.children)) {
2460 /* There is a target that is a non-empty directory, so we fail */
2461 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2462 } else if (existingTarget && existingTarget != obj) {
2463 /* Nuke the target first, using shadowing,
2464 * but only if it isn't the same object
2465 */
2466 yaffs_ChangeObjectName(obj, newDir, newName, force,
2467 existingTarget->objectId);
2468 yaffs_UnlinkObject(existingTarget);
2469 }
2470
2471 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2472 }
2473 return YAFFS_FAIL;
2474 }
2475
2476 /*------------------------- Block Management and Page Allocation ----------------*/
2477
2478 static int yaffs_InitialiseBlocks(yaffs_Device * dev)
2479 {
2480 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2481
2482 dev->blockInfo = NULL;
2483 dev->chunkBits = NULL;
2484
2485 dev->allocationBlock = -1; /* force it to get a new one */
2486
2487 /* If the first allocation strategy fails, thry the alternate one */
2488 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2489 if(!dev->blockInfo){
2490 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2491 dev->blockInfoAlt = 1;
2492 }
2493 else
2494 dev->blockInfoAlt = 0;
2495
2496 if(dev->blockInfo){
2497
2498 /* Set up dynamic blockinfo stuff. */
2499 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2500 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2501 if(!dev->chunkBits){
2502 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2503 dev->chunkBitsAlt = 1;
2504 }
2505 else
2506 dev->chunkBitsAlt = 0;
2507 }
2508
2509 if (dev->blockInfo && dev->chunkBits) {
2510 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2511 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2512 return YAFFS_OK;
2513 }
2514
2515 return YAFFS_FAIL;
2516
2517 }
2518
2519 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
2520 {
2521 if(dev->blockInfoAlt && dev->blockInfo)
2522 YFREE_ALT(dev->blockInfo);
2523 else if(dev->blockInfo)
2524 YFREE(dev->blockInfo);
2525
2526 dev->blockInfoAlt = 0;
2527
2528 dev->blockInfo = NULL;
2529
2530 if(dev->chunkBitsAlt && dev->chunkBits)
2531 YFREE_ALT(dev->chunkBits);
2532 else if(dev->chunkBits)
2533 YFREE(dev->chunkBits);
2534 dev->chunkBitsAlt = 0;
2535 dev->chunkBits = NULL;
2536 }
2537
2538 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
2539 yaffs_BlockInfo * bi)
2540 {
2541 int i;
2542 __u32 seq;
2543 yaffs_BlockInfo *b;
2544
2545 if (!dev->isYaffs2)
2546 return 1; /* disqualification only applies to yaffs2. */
2547
2548 if (!bi->hasShrinkHeader)
2549 return 1; /* can gc */
2550
2551 /* Find the oldest dirty sequence number if we don't know it and save it
2552 * so we don't have to keep recomputing it.
2553 */
2554 if (!dev->oldestDirtySequence) {
2555 seq = dev->sequenceNumber;
2556
2557 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2558 i++) {
2559 b = yaffs_GetBlockInfo(dev, i);
2560 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2561 (b->pagesInUse - b->softDeletions) <
2562 dev->nChunksPerBlock && b->sequenceNumber < seq) {
2563 seq = b->sequenceNumber;
2564 }
2565 }
2566 dev->oldestDirtySequence = seq;
2567 }
2568
2569 /* Can't do gc of this block if there are any blocks older than this one that have
2570 * discarded pages.
2571 */
2572 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2573
2574 }
2575
2576 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2577 * for garbage collection.
2578 */
2579
2580 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
2581 int aggressive)
2582 {
2583
2584 int b = dev->currentDirtyChecker;
2585
2586 int i;
2587 int iterations;
2588 int dirtiest = -1;
2589 int pagesInUse = 0;
2590 int prioritised=0;
2591 yaffs_BlockInfo *bi;
2592 int pendingPrioritisedExist = 0;
2593
2594 /* First let's see if we need to grab a prioritised block */
2595 if(dev->hasPendingPrioritisedGCs){
2596 for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
2597
2598 bi = yaffs_GetBlockInfo(dev, i);
2599 //yaffs_VerifyBlock(dev,bi,i);
2600
2601 if(bi->gcPrioritise) {
2602 pendingPrioritisedExist = 1;
2603 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2604 yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
2605 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2606 dirtiest = i;
2607 prioritised = 1;
2608 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2609 }
2610 }
2611 }
2612
2613 if(!pendingPrioritisedExist) /* None found, so we can clear this */
2614 dev->hasPendingPrioritisedGCs = 0;
2615 }
2616
2617 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2618 * search harder.
2619 * else (we're doing a leasurely gc), then we only bother to do this if the
2620 * block has only a few pages in use.
2621 */
2622
2623 dev->nonAggressiveSkip--;
2624
2625 if (!aggressive && (dev->nonAggressiveSkip > 0)) {
2626 return -1;
2627 }
2628
2629 if(!prioritised)
2630 pagesInUse =
2631 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2632
2633 if (aggressive) {
2634 iterations =
2635 dev->internalEndBlock - dev->internalStartBlock + 1;
2636 } else {
2637 iterations =
2638 dev->internalEndBlock - dev->internalStartBlock + 1;
2639 iterations = iterations / 16;
2640 if (iterations > 200) {
2641 iterations = 200;
2642 }
2643 }
2644
2645 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2646 b++;
2647 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2648 b = dev->internalStartBlock;
2649 }
2650
2651 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2652 T(YAFFS_TRACE_ERROR,
2653 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2654 YBUG();
2655 }
2656
2657 bi = yaffs_GetBlockInfo(dev, b);
2658
2659 #if 0
2660 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
2661 dirtiest = b;
2662 pagesInUse = 0;
2663 }
2664 else
2665 #endif
2666
2667 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2668 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2669 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2670 dirtiest = b;
2671 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2672 }
2673 }
2674
2675 dev->currentDirtyChecker = b;
2676
2677 if (dirtiest > 0) {
2678 T(YAFFS_TRACE_GC,
2679 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2680 dev->nChunksPerBlock - pagesInUse,prioritised));
2681 }
2682
2683 dev->oldestDirtySequence = 0;
2684
2685 if (dirtiest > 0) {
2686 dev->nonAggressiveSkip = 4;
2687 }
2688
2689 return dirtiest;
2690 }
2691
2692 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
2693 {
2694 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2695
2696 int erasedOk = 0;
2697
2698 /* If the block is still healthy erase it and mark as clean.
2699 * If the block has had a data failure, then retire it.
2700 */
2701
2702 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2703 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2704 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2705
2706 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2707
2708 if (!bi->needsRetiring) {
2709 yaffs_InvalidateCheckpoint(dev);
2710 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2711 if (!erasedOk) {
2712 dev->nErasureFailures++;
2713 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2714 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2715 }
2716 }
2717
2718 if (erasedOk &&
2719 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2720 int i;
2721 for (i = 0; i < dev->nChunksPerBlock; i++) {
2722 if (!yaffs_CheckChunkErased
2723 (dev, blockNo * dev->nChunksPerBlock + i)) {
2724 T(YAFFS_TRACE_ERROR,
2725 (TSTR
2726 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2727 TENDSTR), blockNo, i));
2728 }
2729 }
2730 }
2731
2732 if (erasedOk) {
2733 /* Clean it up... */
2734 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2735 dev->nErasedBlocks++;
2736 bi->pagesInUse = 0;
2737 bi->softDeletions = 0;
2738 bi->hasShrinkHeader = 0;
2739 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2740 bi->gcPrioritise = 0;
2741 yaffs_ClearChunkBits(dev, blockNo);
2742
2743 T(YAFFS_TRACE_ERASE,
2744 (TSTR("Erased block %d" TENDSTR), blockNo));
2745 } else {
2746 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
2747
2748 yaffs_RetireBlock(dev, blockNo);
2749 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2750 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2751 }
2752 }
2753
2754 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2755 {
2756 int i;
2757
2758 yaffs_BlockInfo *bi;
2759
2760 if (dev->nErasedBlocks < 1) {
2761 /* Hoosterman we've got a problem.
2762 * Can't get space to gc
2763 */
2764 T(YAFFS_TRACE_ERROR,
2765 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2766
2767 return -1;
2768 }
2769
2770 /* Find an empty block. */
2771
2772 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2773 dev->allocationBlockFinder++;
2774 if (dev->allocationBlockFinder < dev->internalStartBlock
2775 || dev->allocationBlockFinder > dev->internalEndBlock) {
2776 dev->allocationBlockFinder = dev->internalStartBlock;
2777 }
2778
2779 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2780
2781 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2782 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2783 dev->sequenceNumber++;
2784 bi->sequenceNumber = dev->sequenceNumber;
2785 dev->nErasedBlocks--;
2786 T(YAFFS_TRACE_ALLOCATE,
2787 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2788 dev->allocationBlockFinder, dev->sequenceNumber,
2789 dev->nErasedBlocks));
2790 return dev->allocationBlockFinder;
2791 }
2792 }
2793
2794 T(YAFFS_TRACE_ALWAYS,
2795 (TSTR
2796 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2797 TENDSTR), dev->nErasedBlocks));
2798
2799 return -1;
2800 }
2801
2802
2803 // Check if there's space to allocate...
2804 // Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2805 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2806 {
2807 int reservedChunks;
2808 int reservedBlocks = dev->nReservedBlocks;
2809 int checkpointBlocks;
2810
2811 checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
2812 if(checkpointBlocks < 0)
2813 checkpointBlocks = 0;
2814
2815 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2816
2817 return (dev->nFreeChunks > reservedChunks);
2818 }
2819
2820 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
2821 {
2822 int retVal;
2823 yaffs_BlockInfo *bi;
2824
2825 if (dev->allocationBlock < 0) {
2826 /* Get next block to allocate off */
2827 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2828 dev->allocationPage = 0;
2829 }
2830
2831 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2832 /* Not enough space to allocate unless we're allowed to use the reserve. */
2833 return -1;
2834 }
2835
2836 if (dev->nErasedBlocks < dev->nReservedBlocks
2837 && dev->allocationPage == 0) {
2838 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2839 }
2840
2841 /* Next page please.... */
2842 if (dev->allocationBlock >= 0) {
2843 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2844
2845 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2846 dev->allocationPage;
2847 bi->pagesInUse++;
2848 yaffs_SetChunkBit(dev, dev->allocationBlock,
2849 dev->allocationPage);
2850
2851 dev->allocationPage++;
2852
2853 dev->nFreeChunks--;
2854
2855 /* If the block is full set the state to full */
2856 if (dev->allocationPage >= dev->nChunksPerBlock) {
2857 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2858 dev->allocationBlock = -1;
2859 }
2860
2861 if(blockUsedPtr)
2862 *blockUsedPtr = bi;
2863
2864 return retVal;
2865 }
2866
2867 T(YAFFS_TRACE_ERROR,
2868 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2869
2870 return -1;
2871 }
2872
2873 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2874 {
2875 int n;
2876
2877 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2878
2879 if (dev->allocationBlock > 0) {
2880 n += (dev->nChunksPerBlock - dev->allocationPage);
2881 }
2882
2883 return n;
2884
2885 }
2886
2887 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2888 {
2889 int oldChunk;
2890 int newChunk;
2891 int chunkInBlock;
2892 int markNAND;
2893 int retVal = YAFFS_OK;
2894 int cleanups = 0;
2895 int i;
2896 int isCheckpointBlock;
2897 int matchingChunk;
2898
2899 int chunksBefore = yaffs_GetErasedChunks(dev);
2900 int chunksAfter;
2901
2902 yaffs_ExtendedTags tags;
2903
2904 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2905
2906 yaffs_Object *object;
2907
2908 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2909
2910 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2911
2912 T(YAFFS_TRACE_TRACING,
2913 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2914 bi->pagesInUse, bi->hasShrinkHeader));
2915
2916 /*yaffs_VerifyFreeChunks(dev); */
2917
2918 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2919
2920 /* Take off the number of soft deleted entries because
2921 * they're going to get really deleted during GC.
2922 */
2923 dev->nFreeChunks -= bi->softDeletions;
2924
2925 dev->isDoingGC = 1;
2926
2927 if (isCheckpointBlock ||
2928 !yaffs_StillSomeChunkBits(dev, block)) {
2929 T(YAFFS_TRACE_TRACING,
2930 (TSTR
2931 ("Collecting block %d that has no chunks in use" TENDSTR),
2932 block));
2933 yaffs_BlockBecameDirty(dev, block);
2934 } else {
2935
2936 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2937
2938 yaffs_VerifyBlock(dev,bi,block);
2939
2940 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2941 chunkInBlock < dev->nChunksPerBlock
2942 && yaffs_StillSomeChunkBits(dev, block);
2943 chunkInBlock++, oldChunk++) {
2944 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2945
2946 /* This page is in use and might need to be copied off */
2947
2948 markNAND = 1;
2949
2950 yaffs_InitialiseTags(&tags);
2951
2952 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2953 buffer, &tags);
2954
2955 object =
2956 yaffs_FindObjectByNumber(dev,
2957 tags.objectId);
2958
2959 T(YAFFS_TRACE_GC_DETAIL,
2960 (TSTR
2961 ("Collecting page %d, %d %d %d " TENDSTR),
2962 chunkInBlock, tags.objectId, tags.chunkId,
2963 tags.byteCount));
2964
2965 if(object && !yaffs_SkipVerification(dev)){
2966 if(tags.chunkId == 0)
2967 matchingChunk = object->chunkId;
2968 else if(object->softDeleted)
2969 matchingChunk = oldChunk; /* Defeat the test */
2970 else
2971 matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
2972
2973 if(oldChunk != matchingChunk)
2974 T(YAFFS_TRACE_ERROR,
2975 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2976 oldChunk,matchingChunk,tags.objectId, tags.chunkId));
2977
2978 }
2979
2980 if (!object) {
2981 T(YAFFS_TRACE_ERROR,
2982 (TSTR
2983 ("page %d in gc has no object: %d %d %d "
2984 TENDSTR), oldChunk,
2985 tags.objectId, tags.chunkId, tags.byteCount));
2986 }
2987
2988 if (object && object->deleted
2989 && tags.chunkId != 0) {
2990 /* Data chunk in a deleted file, throw it away
2991 * It's a soft deleted data chunk,
2992 * No need to copy this, just forget about it and
2993 * fix up the object.
2994 */
2995
2996 object->nDataChunks--;
2997
2998 if (object->nDataChunks <= 0) {
2999 /* remeber to clean up the object */
3000 dev->gcCleanupList[cleanups] =
3001 tags.objectId;
3002 cleanups++;
3003 }
3004 markNAND = 0;
3005 } else if (0
3006 /* Todo object && object->deleted && object->nDataChunks == 0 */
3007 ) {
3008 /* Deleted object header with no data chunks.
3009 * Can be discarded and the file deleted.
3010 */
3011 object->chunkId = 0;
3012 yaffs_FreeTnode(object->myDev,
3013 object->variant.
3014 fileVariant.top);
3015 object->variant.fileVariant.top = NULL;
3016 yaffs_DoGenericObjectDeletion(object);
3017
3018 } else if (object) {
3019 /* It's either a data chunk in a live file or
3020 * an ObjectHeader, so we're interested in it.
3021 * NB Need to keep the ObjectHeaders of deleted files
3022 * until the whole file has been deleted off
3023 */
3024 tags.serialNumber++;
3025
3026 dev->nGCCopies++;
3027
3028 if (tags.chunkId == 0) {
3029 /* It is an object Id,
3030 * We need to nuke the shrinkheader flags first
3031 * We no longer want the shrinkHeader flag since its work is done
3032 * and if it is left in place it will mess up scanning.
3033 * Also, clear out any shadowing stuff
3034 */
3035
3036 yaffs_ObjectHeader *oh;
3037 oh = (yaffs_ObjectHeader *)buffer;
3038 oh->isShrink = 0;
3039 oh->shadowsObject = -1;
3040 tags.extraShadows = 0;
3041 tags.extraIsShrinkHeader = 0;
3042
3043 yaffs_VerifyObjectHeader(object,oh,&tags,1);
3044 }
3045
3046 newChunk =
3047 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3048
3049 if (newChunk < 0) {
3050 retVal = YAFFS_FAIL;
3051 } else {
3052
3053 /* Ok, now fix up the Tnodes etc. */
3054
3055 if (tags.chunkId == 0) {
3056 /* It's a header */
3057 object->chunkId = newChunk;
3058 object->serial = tags.serialNumber;
3059 } else {
3060 /* It's a data chunk */
3061 yaffs_PutChunkIntoFile
3062 (object,
3063 tags.chunkId,
3064 newChunk, 0);
3065 }
3066 }
3067 }
3068
3069 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3070
3071 }
3072 }
3073
3074 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3075
3076
3077 /* Do any required cleanups */
3078 for (i = 0; i < cleanups; i++) {
3079 /* Time to delete the file too */
3080 object =
3081 yaffs_FindObjectByNumber(dev,
3082 dev->gcCleanupList[i]);
3083 if (object) {
3084 yaffs_FreeTnode(dev,
3085 object->variant.fileVariant.
3086 top);
3087 object->variant.fileVariant.top = NULL;
3088 T(YAFFS_TRACE_GC,
3089 (TSTR
3090 ("yaffs: About to finally delete object %d"
3091 TENDSTR), object->objectId));
3092 yaffs_DoGenericObjectDeletion(object);
3093 object->myDev->nDeletedFiles--;
3094 }
3095
3096 }
3097
3098 }
3099
3100 yaffs_VerifyCollectedBlock(dev,bi,block);
3101
3102 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
3103 T(YAFFS_TRACE_GC,
3104 (TSTR
3105 ("gc did not increase free chunks before %d after %d"
3106 TENDSTR), chunksBefore, chunksAfter));
3107 }
3108
3109 dev->isDoingGC = 0;
3110
3111 return YAFFS_OK;
3112 }
3113
3114 /* New garbage collector
3115 * If we're very low on erased blocks then we do aggressive garbage collection
3116 * otherwise we do "leasurely" garbage collection.
3117 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3118 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3119 *
3120 * The idea is to help clear out space in a more spread-out manner.
3121 * Dunno if it really does anything useful.
3122 */
3123 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
3124 {
3125 int block;
3126 int aggressive;
3127 int gcOk = YAFFS_OK;
3128 int maxTries = 0;
3129
3130 int checkpointBlockAdjust;
3131
3132 if (dev->isDoingGC) {
3133 /* Bail out so we don't get recursive gc */
3134 return YAFFS_OK;
3135 }
3136
3137 /* This loop should pass the first time.
3138 * We'll only see looping here if the erase of the collected block fails.
3139 */
3140
3141 do {
3142 maxTries++;
3143
3144 checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
3145 if(checkpointBlockAdjust < 0)
3146 checkpointBlockAdjust = 0;
3147
3148 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3149 /* We need a block soon...*/
3150 aggressive = 1;
3151 } else {
3152 /* We're in no hurry */
3153 aggressive = 0;
3154 }
3155
3156 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3157
3158 if (block > 0) {
3159 dev->garbageCollections++;
3160 if (!aggressive) {
3161 dev->passiveGarbageCollections++;
3162 }
3163
3164 T(YAFFS_TRACE_GC,
3165 (TSTR
3166 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3167 dev->nErasedBlocks, aggressive));
3168
3169 gcOk = yaffs_GarbageCollectBlock(dev, block);
3170 }
3171
3172 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3173 T(YAFFS_TRACE_GC,
3174 (TSTR
3175 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3176 TENDSTR), dev->nErasedBlocks, maxTries, block));
3177 }
3178 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
3179 && (maxTries < 2));
3180
3181 return aggressive ? gcOk : YAFFS_OK;
3182 }
3183
3184 /*------------------------- TAGS --------------------------------*/
3185
3186 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
3187 int chunkInObject)
3188 {
3189 return (tags->chunkId == chunkInObject &&
3190 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3191
3192 }
3193
3194
3195 /*-------------------- Data file manipulation -----------------*/
3196
3197 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
3198 yaffs_ExtendedTags * tags)
3199 {
3200 /*Get the Tnode, then get the level 0 offset chunk offset */
3201 yaffs_Tnode *tn;
3202 int theChunk = -1;
3203 yaffs_ExtendedTags localTags;
3204 int retVal = -1;
3205
3206 yaffs_Device *dev = in->myDev;
3207
3208 if (!tags) {
3209 /* Passed a NULL, so use our own tags space */
3210 tags = &localTags;
3211 }
3212
3213 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3214
3215 if (tn) {
3216 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3217
3218 retVal =
3219 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3220 chunkInInode);
3221 }
3222 return retVal;
3223 }
3224
3225 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
3226 yaffs_ExtendedTags * tags)
3227 {
3228 /* Get the Tnode, then get the level 0 offset chunk offset */
3229 yaffs_Tnode *tn;
3230 int theChunk = -1;
3231 yaffs_ExtendedTags localTags;
3232
3233 yaffs_Device *dev = in->myDev;
3234 int retVal = -1;
3235
3236 if (!tags) {
3237 /* Passed a NULL, so use our own tags space */
3238 tags = &localTags;
3239 }
3240
3241 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3242
3243 if (tn) {
3244
3245 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3246
3247 retVal =
3248 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3249 chunkInInode);
3250
3251 /* Delete the entry in the filestructure (if found) */
3252 if (retVal != -1) {
3253 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
3254 }
3255 } else {
3256 /*T(("No level 0 found for %d\n", chunkInInode)); */
3257 }
3258
3259 if (retVal == -1) {
3260 /* T(("Could not find %d to delete\n",chunkInInode)); */
3261 }
3262 return retVal;
3263 }
3264
3265 #ifdef YAFFS_PARANOID
3266
3267 static int yaffs_CheckFileSanity(yaffs_Object * in)
3268 {
3269 int chunk;
3270 int nChunks;
3271 int fSize;
3272 int failed = 0;
3273 int objId;
3274 yaffs_Tnode *tn;
3275 yaffs_Tags localTags;
3276 yaffs_Tags *tags = &localTags;
3277 int theChunk;
3278 int chunkDeleted;
3279
3280 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3281 /* T(("Object not a file\n")); */
3282 return YAFFS_FAIL;
3283 }
3284
3285 objId = in->objectId;
3286 fSize = in->variant.fileVariant.fileSize;
3287 nChunks =
3288 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3289
3290 for (chunk = 1; chunk <= nChunks; chunk++) {
3291 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3292 chunk);
3293
3294 if (tn) {
3295
3296 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
3297
3298 if (yaffs_CheckChunkBits
3299 (dev, theChunk / dev->nChunksPerBlock,
3300 theChunk % dev->nChunksPerBlock)) {
3301
3302 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3303 tags,
3304 &chunkDeleted);
3305 if (yaffs_TagsMatch
3306 (tags, in->objectId, chunk, chunkDeleted)) {
3307 /* found it; */
3308
3309 }
3310 } else {
3311
3312 failed = 1;
3313 }
3314
3315 } else {
3316 /* T(("No level 0 found for %d\n", chunk)); */
3317 }
3318 }
3319
3320 return failed ? YAFFS_FAIL : YAFFS_OK;
3321 }
3322
3323 #endif
3324
3325 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
3326 int chunkInNAND, int inScan)
3327 {
3328 /* NB inScan is zero unless scanning.
3329 * For forward scanning, inScan is > 0;
3330 * for backward scanning inScan is < 0
3331 */
3332
3333 yaffs_Tnode *tn;
3334 yaffs_Device *dev = in->myDev;
3335 int existingChunk;
3336 yaffs_ExtendedTags existingTags;
3337 yaffs_ExtendedTags newTags;
3338 unsigned existingSerial, newSerial;
3339
3340 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3341 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3342 * If it is not during Scanning then something went wrong!
3343 */
3344 if (!inScan) {
3345 T(YAFFS_TRACE_ERROR,
3346 (TSTR
3347 ("yaffs tragedy:attempt to put data chunk into a non-file"
3348 TENDSTR)));
3349 YBUG();
3350 }
3351
3352 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3353 return YAFFS_OK;
3354 }
3355
3356 tn = yaffs_AddOrFindLevel0Tnode(dev,
3357 &in->variant.fileVariant,
3358 chunkInInode,
3359 NULL);
3360 if (!tn) {
3361 return YAFFS_FAIL;
3362 }
3363
3364 existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3365
3366 if (inScan != 0) {
3367 /* If we're scanning then we need to test for duplicates
3368 * NB This does not need to be efficient since it should only ever
3369 * happen when the power fails during a write, then only one
3370 * chunk should ever be affected.
3371 *
3372 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3373 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3374 */
3375
3376 if (existingChunk != 0) {
3377 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3378 * thus we have to do a FindChunkInFile to get the real chunk id.
3379 *
3380 * We have a duplicate now we need to decide which one to use:
3381 *
3382 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3383 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3384 * YAFFS1: Get both sets of tags and compare serial numbers.
3385 */
3386
3387 if (inScan > 0) {
3388 /* Only do this for forward scanning */
3389 yaffs_ReadChunkWithTagsFromNAND(dev,
3390 chunkInNAND,
3391 NULL, &newTags);
3392
3393 /* Do a proper find */
3394 existingChunk =
3395 yaffs_FindChunkInFile(in, chunkInInode,
3396 &existingTags);
3397 }
3398
3399 if (existingChunk <= 0) {
3400 /*Hoosterman - how did this happen? */
3401
3402 T(YAFFS_TRACE_ERROR,
3403 (TSTR
3404 ("yaffs tragedy: existing chunk < 0 in scan"
3405 TENDSTR)));
3406
3407 }
3408
3409 /* NB The deleted flags should be false, otherwise the chunks will
3410 * not be loaded during a scan
3411 */
3412
3413 newSerial = newTags.serialNumber;
3414 existingSerial = existingTags.serialNumber;
3415
3416 if ((inScan > 0) &&
3417 (in->myDev->isYaffs2 ||
3418 existingChunk <= 0 ||
3419 ((existingSerial + 1) & 3) == newSerial)) {
3420 /* Forward scanning.
3421 * Use new
3422 * Delete the old one and drop through to update the tnode
3423 */
3424 yaffs_DeleteChunk(dev, existingChunk, 1,
3425 __LINE__);
3426 } else {
3427 /* Backward scanning or we want to use the existing one
3428 * Use existing.
3429 * Delete the new one and return early so that the tnode isn't changed
3430 */
3431 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3432 __LINE__);
3433 return YAFFS_OK;
3434 }
3435 }
3436
3437 }
3438
3439 if (existingChunk == 0) {
3440 in->nDataChunks++;
3441 }
3442
3443 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
3444
3445 return YAFFS_OK;
3446 }
3447
3448 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
3449 __u8 * buffer)
3450 {
3451 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3452
3453 if (chunkInNAND >= 0) {
3454 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3455 buffer,NULL);
3456 } else {
3457 T(YAFFS_TRACE_NANDACCESS,
3458 (TSTR("Chunk %d not found zero instead" TENDSTR),
3459 chunkInNAND));
3460 /* get sane (zero) data if you read a hole */
3461 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3462 return 0;
3463 }
3464
3465 }
3466
3467 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
3468 {
3469 int block;
3470 int page;
3471 yaffs_ExtendedTags tags;
3472 yaffs_BlockInfo *bi;
3473
3474 if (chunkId <= 0)
3475 return;
3476
3477
3478 dev->nDeletions++;
3479 block = chunkId / dev->nChunksPerBlock;
3480 page = chunkId % dev->nChunksPerBlock;
3481
3482
3483 if(!yaffs_CheckChunkBit(dev,block,page))
3484 T(YAFFS_TRACE_VERIFY,
3485 (TSTR("Deleting invalid chunk %d"TENDSTR),
3486 chunkId));
3487
3488 bi = yaffs_GetBlockInfo(dev, block);
3489
3490 T(YAFFS_TRACE_DELETION,
3491 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3492
3493 if (markNAND &&
3494 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3495
3496 yaffs_InitialiseTags(&tags);
3497
3498 tags.chunkDeleted = 1;
3499
3500 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3501 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3502 } else {
3503 dev->nUnmarkedDeletions++;
3504 }
3505
3506 /* Pull out of the management area.
3507 * If the whole block became dirty, this will kick off an erasure.
3508 */
3509 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3510 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3511 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3512 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3513 dev->nFreeChunks++;
3514
3515 yaffs_ClearChunkBit(dev, block, page);
3516
3517 bi->pagesInUse--;
3518
3519 if (bi->pagesInUse == 0 &&
3520 !bi->hasShrinkHeader &&
3521 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3522 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3523 yaffs_BlockBecameDirty(dev, block);
3524 }
3525
3526 } else {
3527 /* T(("Bad news deleting chunk %d\n",chunkId)); */
3528 }
3529
3530 }
3531
3532 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
3533 const __u8 * buffer, int nBytes,
3534 int useReserve)
3535 {
3536 /* Find old chunk Need to do this to get serial number
3537 * Write new one and patch into tree.
3538 * Invalidate old tags.
3539 */
3540
3541 int prevChunkId;
3542 yaffs_ExtendedTags prevTags;
3543
3544 int newChunkId;
3545 yaffs_ExtendedTags newTags;
3546
3547 yaffs_Device *dev = in->myDev;
3548
3549 yaffs_CheckGarbageCollection(dev);
3550
3551 /* Get the previous chunk at this location in the file if it exists */
3552 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3553
3554 /* Set up new tags */
3555 yaffs_InitialiseTags(&newTags);
3556
3557 newTags.chunkId = chunkInInode;
3558 newTags.objectId = in->objectId;
3559 newTags.serialNumber =
3560 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3561 newTags.byteCount = nBytes;
3562
3563 newChunkId =
3564 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3565 useReserve);
3566
3567 if (newChunkId >= 0) {
3568 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3569
3570 if (prevChunkId >= 0) {
3571 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3572
3573 }
3574
3575 yaffs_CheckFileSanity(in);
3576 }
3577 return newChunkId;
3578
3579 }
3580
3581 /* UpdateObjectHeader updates the header on NAND for an object.
3582 * If name is not NULL, then that new name is used.
3583 */
3584 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
3585 int isShrink, int shadows)
3586 {
3587
3588 yaffs_BlockInfo *bi;
3589
3590 yaffs_Device *dev = in->myDev;
3591
3592 int prevChunkId;
3593 int retVal = 0;
3594 int result = 0;
3595
3596 int newChunkId;
3597 yaffs_ExtendedTags newTags;
3598 yaffs_ExtendedTags oldTags;
3599
3600 __u8 *buffer = NULL;
3601 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3602
3603 yaffs_ObjectHeader *oh = NULL;
3604
3605 yaffs_strcpy(oldName,"silly old name");
3606
3607 if (!in->fake || force) {
3608
3609 yaffs_CheckGarbageCollection(dev);
3610 yaffs_CheckObjectDetailsLoaded(in);
3611
3612 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3613 oh = (yaffs_ObjectHeader *) buffer;
3614
3615 prevChunkId = in->chunkId;
3616
3617 if (prevChunkId >= 0) {
3618 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3619 buffer, &oldTags);
3620
3621 yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
3622
3623 memcpy(oldName, oh->name, sizeof(oh->name));
3624 }
3625
3626 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3627
3628 oh->type = in->variantType;
3629 oh->yst_mode = in->yst_mode;
3630 oh->shadowsObject = shadows;
3631
3632 #ifdef CONFIG_YAFFS_WINCE
3633 oh->win_atime[0] = in->win_atime[0];
3634 oh->win_ctime[0] = in->win_ctime[0];
3635 oh->win_mtime[0] = in->win_mtime[0];
3636 oh->win_atime[1] = in->win_atime[1];
3637 oh->win_ctime[1] = in->win_ctime[1];
3638 oh->win_mtime[1] = in->win_mtime[1];
3639 #else
3640 oh->yst_uid = in->yst_uid;
3641 oh->yst_gid = in->yst_gid;
3642 oh->yst_atime = in->yst_atime;
3643 oh->yst_mtime = in->yst_mtime;
3644 oh->yst_ctime = in->yst_ctime;
3645 oh->yst_rdev = in->yst_rdev;
3646 #endif
3647 if (in->parent) {
3648 oh->parentObjectId = in->parent->objectId;
3649 } else {
3650 oh->parentObjectId = 0;
3651 }
3652
3653 if (name && *name) {
3654 memset(oh->name, 0, sizeof(oh->name));
3655 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3656 } else if (prevChunkId>=0) {
3657 memcpy(oh->name, oldName, sizeof(oh->name));
3658 } else {
3659 memset(oh->name, 0, sizeof(oh->name));
3660 }
3661
3662 oh->isShrink = isShrink;
3663
3664 switch (in->variantType) {
3665 case YAFFS_OBJECT_TYPE_UNKNOWN:
3666 /* Should not happen */
3667 break;
3668 case YAFFS_OBJECT_TYPE_FILE:
3669 oh->fileSize =
3670 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3671 || oh->parentObjectId ==
3672 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3673 fileVariant.fileSize;
3674 break;
3675 case YAFFS_OBJECT_TYPE_HARDLINK:
3676 oh->equivalentObjectId =
3677 in->variant.hardLinkVariant.equivalentObjectId;
3678 break;
3679 case YAFFS_OBJECT_TYPE_SPECIAL:
3680 /* Do nothing */
3681 break;
3682 case YAFFS_OBJECT_TYPE_DIRECTORY:
3683 /* Do nothing */
3684 break;
3685 case YAFFS_OBJECT_TYPE_SYMLINK:
3686 yaffs_strncpy(oh->alias,
3687 in->variant.symLinkVariant.alias,
3688 YAFFS_MAX_ALIAS_LENGTH);
3689 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3690 break;
3691 }
3692
3693 /* Tags */
3694 yaffs_InitialiseTags(&newTags);
3695 in->serial++;
3696 newTags.chunkId = 0;
3697 newTags.objectId = in->objectId;
3698 newTags.serialNumber = in->serial;
3699
3700 /* Add extra info for file header */
3701
3702 newTags.extraHeaderInfoAvailable = 1;
3703 newTags.extraParentObjectId = oh->parentObjectId;
3704 newTags.extraFileLength = oh->fileSize;
3705 newTags.extraIsShrinkHeader = oh->isShrink;
3706 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3707 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3708 newTags.extraObjectType = in->variantType;
3709
3710 yaffs_VerifyObjectHeader(in,oh,&newTags,1);
3711
3712 /* Create new chunk in NAND */
3713 newChunkId =
3714 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3715 (prevChunkId >= 0) ? 1 : 0);
3716
3717 if (newChunkId >= 0) {
3718
3719 in->chunkId = newChunkId;
3720
3721 if (prevChunkId >= 0) {
3722 yaffs_DeleteChunk(dev, prevChunkId, 1,
3723 __LINE__);
3724 }
3725
3726 if(!yaffs_ObjectHasCachedWriteData(in))
3727 in->dirty = 0;
3728
3729 /* If this was a shrink, then mark the block that the chunk lives on */
3730 if (isShrink) {
3731 bi = yaffs_GetBlockInfo(in->myDev,
3732 newChunkId /in->myDev-> nChunksPerBlock);
3733 bi->hasShrinkHeader = 1;
3734 }
3735
3736 }
3737
3738 retVal = newChunkId;
3739
3740 }
3741
3742 if (buffer)
3743 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3744
3745 return retVal;
3746 }
3747
3748 /*------------------------ Short Operations Cache ----------------------------------------
3749 * In many situations where there is no high level buffering (eg WinCE) a lot of
3750 * reads might be short sequential reads, and a lot of writes may be short
3751 * sequential writes. eg. scanning/writing a jpeg file.
3752 * In these cases, a short read/write cache can provide a huge perfomance benefit
3753 * with dumb-as-a-rock code.
3754 * In Linux, the page cache provides read buffering aand the short op cache provides write
3755 * buffering.
3756 *
3757 * There are a limited number (~10) of cache chunks per device so that we don't
3758 * need a very intelligent search.
3759 */
3760
3761 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3762 {
3763 yaffs_Device *dev = obj->myDev;
3764 int i;
3765 yaffs_ChunkCache *cache;
3766 int nCaches = obj->myDev->nShortOpCaches;
3767
3768 for(i = 0; i < nCaches; i++){
3769 cache = &dev->srCache[i];
3770 if (cache->object == obj &&
3771 cache->dirty)
3772 return 1;
3773 }
3774
3775 return 0;
3776 }
3777
3778
3779 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
3780 {
3781 yaffs_Device *dev = obj->myDev;
3782 int lowest = -99; /* Stop compiler whining. */
3783 int i;
3784 yaffs_ChunkCache *cache;
3785 int chunkWritten = 0;
3786 int nCaches = obj->myDev->nShortOpCaches;
3787
3788 if (nCaches > 0) {
3789 do {
3790 cache = NULL;
3791
3792 /* Find the dirty cache for this object with the lowest chunk id. */
3793 for (i = 0; i < nCaches; i++) {
3794 if (dev->srCache[i].object == obj &&
3795 dev->srCache[i].dirty) {
3796 if (!cache
3797 || dev->srCache[i].chunkId <
3798 lowest) {
3799 cache = &dev->srCache[i];
3800 lowest = cache->chunkId;
3801 }
3802 }
3803 }
3804
3805 if (cache && !cache->locked) {
3806 /* Write it out and free it up */
3807
3808 chunkWritten =
3809 yaffs_WriteChunkDataToObject(cache->object,
3810 cache->chunkId,
3811 cache->data,
3812 cache->nBytes,
3813 1);
3814 cache->dirty = 0;
3815 cache->object = NULL;
3816 }
3817
3818 } while (cache && chunkWritten > 0);
3819
3820 if (cache) {
3821 /* Hoosterman, disk full while writing cache out. */
3822 T(YAFFS_TRACE_ERROR,
3823 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3824
3825 }
3826 }
3827
3828 }
3829
3830 /*yaffs_FlushEntireDeviceCache(dev)
3831 *
3832 *
3833 */
3834
3835 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3836 {
3837 yaffs_Object *obj;
3838 int nCaches = dev->nShortOpCaches;
3839 int i;
3840
3841 /* Find a dirty object in the cache and flush it...
3842 * until there are no further dirty objects.
3843 */
3844 do {
3845 obj = NULL;
3846 for( i = 0; i < nCaches && !obj; i++) {
3847 if (dev->srCache[i].object &&
3848 dev->srCache[i].dirty)
3849 obj = dev->srCache[i].object;
3850
3851 }
3852 if(obj)
3853 yaffs_FlushFilesChunkCache(obj);
3854
3855 } while(obj);
3856
3857 }
3858
3859
3860 /* Grab us a cache chunk for use.
3861 * First look for an empty one.
3862 * Then look for the least recently used non-dirty one.
3863 * Then look for the least recently used dirty one...., flush and look again.
3864 */
3865 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3866 {
3867 int i;
3868 int usage;
3869 int theOne;
3870
3871 if (dev->nShortOpCaches > 0) {
3872 for (i = 0; i < dev->nShortOpCaches; i++) {
3873 if (!dev->srCache[i].object)
3874 return &dev->srCache[i];
3875 }
3876
3877 return NULL;
3878
3879 theOne = -1;
3880 usage = 0; /* just to stop the compiler grizzling */
3881
3882 for (i = 0; i < dev->nShortOpCaches; i++) {
3883 if (!dev->srCache[i].dirty &&
3884 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3885 theOne < 0)) {
3886 usage = dev->srCache[i].lastUse;
3887 theOne = i;
3888 }
3889 }
3890
3891
3892 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3893 } else {
3894 return NULL;
3895 }
3896
3897 }
3898
3899 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3900 {
3901 yaffs_ChunkCache *cache;
3902 yaffs_Object *theObj;
3903 int usage;
3904 int i;
3905 int pushout;
3906
3907 if (dev->nShortOpCaches > 0) {
3908 /* Try find a non-dirty one... */
3909
3910 cache = yaffs_GrabChunkCacheWorker(dev);
3911
3912 if (!cache) {
3913 /* They were all dirty, find the last recently used object and flush
3914 * its cache, then find again.
3915 * NB what's here is not very accurate, we actually flush the object
3916 * the last recently used page.
3917 */
3918
3919 /* With locking we can't assume we can use entry zero */
3920
3921 theObj = NULL;
3922 usage = -1;
3923 cache = NULL;
3924 pushout = -1;
3925
3926 for (i = 0; i < dev->nShortOpCaches; i++) {
3927 if (dev->srCache[i].object &&
3928 !dev->srCache[i].locked &&
3929 (dev->srCache[i].lastUse < usage || !cache))
3930 {
3931 usage = dev->srCache[i].lastUse;
3932 theObj = dev->srCache[i].object;
3933 cache = &dev->srCache[i];
3934 pushout = i;
3935 }
3936 }
3937
3938 if (!cache || cache->dirty) {
3939 /* Flush and try again */
3940 yaffs_FlushFilesChunkCache(theObj);
3941 cache = yaffs_GrabChunkCacheWorker(dev);
3942 }
3943
3944 }
3945 return cache;
3946 } else
3947 return NULL;
3948
3949 }
3950
3951 /* Find a cached chunk */
3952 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3953 int chunkId)
3954 {
3955 yaffs_Device *dev = obj->myDev;
3956 int i;
3957 if (dev->nShortOpCaches > 0) {
3958 for (i = 0; i < dev->nShortOpCaches; i++) {
3959 if (dev->srCache[i].object == obj &&
3960 dev->srCache[i].chunkId == chunkId) {
3961 dev->cacheHits++;
3962
3963 return &dev->srCache[i];
3964 }
3965 }
3966 }
3967 return NULL;
3968 }
3969
3970 /* Mark the chunk for the least recently used algorithym */
3971 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3972 int isAWrite)
3973 {
3974
3975 if (dev->nShortOpCaches > 0) {
3976 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3977 /* Reset the cache usages */
3978 int i;
3979 for (i = 1; i < dev->nShortOpCaches; i++) {
3980 dev->srCache[i].lastUse = 0;
3981 }
3982 dev->srLastUse = 0;
3983 }
3984
3985 dev->srLastUse++;
3986
3987 cache->lastUse = dev->srLastUse;
3988
3989 if (isAWrite) {
3990 cache->dirty = 1;
3991 }
3992 }
3993 }
3994
3995 /* Invalidate a single cache page.
3996 * Do this when a whole page gets written,
3997 * ie the short cache for this page is no longer valid.
3998 */
3999 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
4000 {
4001 if (object->myDev->nShortOpCaches > 0) {
4002 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4003
4004 if (cache) {
4005 cache->object = NULL;
4006 }
4007 }
4008 }
4009
4010 /* Invalidate all the cache pages associated with this object
4011 * Do this whenever ther file is deleted or resized.
4012 */
4013 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
4014 {
4015 int i;
4016 yaffs_Device *dev = in->myDev;
4017
4018 if (dev->nShortOpCaches > 0) {
4019 /* Invalidate it. */
4020 for (i = 0; i < dev->nShortOpCaches; i++) {
4021 if (dev->srCache[i].object == in) {
4022 dev->srCache[i].object = NULL;
4023 }
4024 }
4025 }
4026 }
4027
4028 /*--------------------- Checkpointing --------------------*/
4029
4030
4031 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
4032 {
4033 yaffs_CheckpointValidity cp;
4034
4035 memset(&cp,0,sizeof(cp));
4036
4037 cp.structType = sizeof(cp);
4038 cp.magic = YAFFS_MAGIC;
4039 cp.version = YAFFS_CHECKPOINT_VERSION;
4040 cp.head = (head) ? 1 : 0;
4041
4042 return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
4043 1 : 0;
4044 }
4045
4046 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4047 {
4048 yaffs_CheckpointValidity cp;
4049 int ok;
4050
4051 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4052
4053 if(ok)
4054 ok = (cp.structType == sizeof(cp)) &&
4055 (cp.magic == YAFFS_MAGIC) &&
4056 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4057 (cp.head == ((head) ? 1 : 0));
4058 return ok ? 1 : 0;
4059 }
4060
4061 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4062 yaffs_Device *dev)
4063 {
4064 cp->nErasedBlocks = dev->nErasedBlocks;
4065 cp->allocationBlock = dev->allocationBlock;
4066 cp->allocationPage = dev->allocationPage;
4067 cp->nFreeChunks = dev->nFreeChunks;
4068
4069 cp->nDeletedFiles = dev->nDeletedFiles;
4070 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4071 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4072 cp->sequenceNumber = dev->sequenceNumber;
4073 cp->oldestDirtySequence = dev->oldestDirtySequence;
4074
4075 }
4076
4077 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4078 yaffs_CheckpointDevice *cp)
4079 {
4080 dev->nErasedBlocks = cp->nErasedBlocks;
4081 dev->allocationBlock = cp->allocationBlock;
4082 dev->allocationPage = cp->allocationPage;
4083 dev->nFreeChunks = cp->nFreeChunks;
4084
4085 dev->nDeletedFiles = cp->nDeletedFiles;
4086 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4087 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4088 dev->sequenceNumber = cp->sequenceNumber;
4089 dev->oldestDirtySequence = cp->oldestDirtySequence;
4090 }
4091
4092
4093 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4094 {
4095 yaffs_CheckpointDevice cp;
4096 __u32 nBytes;
4097 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4098
4099 int ok;
4100
4101 /* Write device runtime values*/
4102 yaffs_DeviceToCheckpointDevice(&cp,dev);
4103 cp.structType = sizeof(cp);
4104
4105 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4106
4107 /* Write block info */
4108 if(ok) {
4109 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4110 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
4111 }
4112
4113 /* Write chunk bits */
4114 if(ok) {
4115 nBytes = nBlocks * dev->chunkBitmapStride;
4116 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
4117 }
4118 return ok ? 1 : 0;
4119
4120 }
4121
4122 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4123 {
4124 yaffs_CheckpointDevice cp;
4125 __u32 nBytes;
4126 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4127
4128 int ok;
4129
4130 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4131 if(!ok)
4132 return 0;
4133
4134 if(cp.structType != sizeof(cp))
4135 return 0;
4136
4137
4138 yaffs_CheckpointDeviceToDevice(dev,&cp);
4139
4140 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4141
4142 ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
4143
4144 if(!ok)
4145 return 0;
4146 nBytes = nBlocks * dev->chunkBitmapStride;
4147
4148 ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
4149
4150 return ok ? 1 : 0;
4151 }
4152
4153 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4154 yaffs_Object *obj)
4155 {
4156
4157 cp->objectId = obj->objectId;
4158 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4159 cp->chunkId = obj->chunkId;
4160 cp->variantType = obj->variantType;
4161 cp->deleted = obj->deleted;
4162 cp->softDeleted = obj->softDeleted;
4163 cp->unlinked = obj->unlinked;
4164 cp->fake = obj->fake;
4165 cp->renameAllowed = obj->renameAllowed;
4166 cp->unlinkAllowed = obj->unlinkAllowed;
4167 cp->serial = obj->serial;
4168 cp->nDataChunks = obj->nDataChunks;
4169
4170 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4171 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4172 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4173 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4174 }
4175
4176 static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
4177 {
4178
4179 yaffs_Object *parent;
4180
4181 obj->objectId = cp->objectId;
4182
4183 if(cp->parentId)
4184 parent = yaffs_FindOrCreateObjectByNumber(
4185 obj->myDev,
4186 cp->parentId,
4187 YAFFS_OBJECT_TYPE_DIRECTORY);
4188 else
4189 parent = NULL;
4190
4191 if(parent)
4192 yaffs_AddObjectToDirectory(parent, obj);
4193
4194 obj->chunkId = cp->chunkId;
4195 obj->variantType = cp->variantType;
4196 obj->deleted = cp->deleted;
4197 obj->softDeleted = cp->softDeleted;
4198 obj->unlinked = cp->unlinked;
4199 obj->fake = cp->fake;
4200 obj->renameAllowed = cp->renameAllowed;
4201 obj->unlinkAllowed = cp->unlinkAllowed;
4202 obj->serial = cp->serial;
4203 obj->nDataChunks = cp->nDataChunks;
4204
4205 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4206 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4207 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4208 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4209
4210 if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
4211 obj->lazyLoaded = 1;
4212 }
4213
4214
4215
4216 static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
4217 __u32 level, int chunkOffset)
4218 {
4219 int i;
4220 yaffs_Device *dev = in->myDev;
4221 int ok = 1;
4222 int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4223
4224 if (tn) {
4225 if (level > 0) {
4226
4227 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
4228 if (tn->internal[i]) {
4229 ok = yaffs_CheckpointTnodeWorker(in,
4230 tn->internal[i],
4231 level - 1,
4232 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4233 }
4234 }
4235 } else if (level == 0) {
4236 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4237 /* printf("write tnode at %d\n",baseOffset); */
4238 ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
4239 if(ok)
4240 ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
4241 }
4242 }
4243
4244 return ok;
4245
4246 }
4247
4248 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4249 {
4250 __u32 endMarker = ~0;
4251 int ok = 1;
4252
4253 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4254 ok = yaffs_CheckpointTnodeWorker(obj,
4255 obj->variant.fileVariant.top,
4256 obj->variant.fileVariant.topLevel,
4257 0);
4258 if(ok)
4259 ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
4260 sizeof(endMarker));
4261 }
4262
4263 return ok ? 1 : 0;
4264 }
4265
4266 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4267 {
4268 __u32 baseChunk;
4269 int ok = 1;
4270 yaffs_Device *dev = obj->myDev;
4271 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4272 yaffs_Tnode *tn;
4273 int nread = 0;
4274
4275 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4276
4277 while(ok && (~baseChunk)){
4278 nread++;
4279 /* Read level 0 tnode */
4280
4281
4282 /* printf("read tnode at %d\n",baseChunk); */
4283 tn = yaffs_GetTnodeRaw(dev);
4284 if(tn)
4285 ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
4286 (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
4287 else
4288 ok = 0;
4289
4290 if(tn && ok){
4291 ok = yaffs_AddOrFindLevel0Tnode(dev,
4292 fileStructPtr,
4293 baseChunk,
4294 tn) ? 1 : 0;
4295
4296 }
4297
4298 if(ok)
4299 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4300
4301 }
4302
4303 T(YAFFS_TRACE_CHECKPOINT,(
4304 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4305 nread,baseChunk,ok));
4306
4307 return ok ? 1 : 0;
4308 }
4309
4310
4311 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4312 {
4313 yaffs_Object *obj;
4314 yaffs_CheckpointObject cp;
4315 int i;
4316 int ok = 1;
4317 struct list_head *lh;
4318
4319
4320 /* Iterate through the objects in each hash entry,
4321 * dumping them to the checkpointing stream.
4322 */
4323
4324 for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
4325 list_for_each(lh, &dev->objectBucket[i].list) {
4326 if (lh) {
4327 obj = list_entry(lh, yaffs_Object, hashLink);
4328 if (!obj->deferedFree) {
4329 yaffs_ObjectToCheckpointObject(&cp,obj);
4330 cp.structType = sizeof(cp);
4331
4332 T(YAFFS_TRACE_CHECKPOINT,(
4333 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4334 cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
4335
4336 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4337
4338 if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4339 ok = yaffs_WriteCheckpointTnodes(obj);
4340 }
4341 }
4342 }
4343 }
4344 }
4345
4346 /* Dump end of list */
4347 memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
4348 cp.structType = sizeof(cp);
4349
4350 if(ok)
4351 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4352
4353 return ok ? 1 : 0;
4354 }
4355
4356 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4357 {
4358 yaffs_Object *obj;
4359 yaffs_CheckpointObject cp;
4360 int ok = 1;
4361 int done = 0;
4362 yaffs_Object *hardList = NULL;
4363
4364 while(ok && !done) {
4365 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4366 if(cp.structType != sizeof(cp)) {
4367 T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
4368 cp.structType,sizeof(cp),ok));
4369 ok = 0;
4370 }
4371
4372 T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4373 cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
4374
4375 if(ok && cp.objectId == ~0)
4376 done = 1;
4377 else if(ok){
4378 obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
4379 if(obj) {
4380 yaffs_CheckpointObjectToObject(obj,&cp);
4381 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4382 ok = yaffs_ReadCheckpointTnodes(obj);
4383 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4384 obj->hardLinks.next =
4385 (struct list_head *)
4386 hardList;
4387 hardList = obj;
4388 }
4389
4390 }
4391 }
4392 }
4393
4394 if(ok)
4395 yaffs_HardlinkFixup(dev,hardList);
4396
4397 return ok ? 1 : 0;
4398 }
4399
4400 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4401 {
4402 __u32 checkpointSum;
4403 int ok;
4404
4405 yaffs_GetCheckpointSum(dev,&checkpointSum);
4406
4407 ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
4408
4409 if(!ok)
4410 return 0;
4411
4412 return 1;
4413 }
4414
4415 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4416 {
4417 __u32 checkpointSum0;
4418 __u32 checkpointSum1;
4419 int ok;
4420
4421 yaffs_GetCheckpointSum(dev,&checkpointSum0);
4422
4423 ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4424
4425 if(!ok)
4426 return 0;
4427
4428 if(checkpointSum0 != checkpointSum1)
4429 return 0;
4430
4431 return 1;
4432 }
4433
4434
4435 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4436 {
4437
4438 int ok = 1;
4439
4440 if(dev->skipCheckpointWrite || !dev->isYaffs2){
4441 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
4442 ok = 0;
4443 }
4444
4445 if(ok)
4446 ok = yaffs_CheckpointOpen(dev,1);
4447
4448 if(ok){
4449 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4450 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
4451 }
4452 if(ok){
4453 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
4454 ok = yaffs_WriteCheckpointDevice(dev);
4455 }
4456 if(ok){
4457 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
4458 ok = yaffs_WriteCheckpointObjects(dev);
4459 }
4460 if(ok){
4461 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4462 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
4463 }
4464
4465 if(ok){
4466 ok = yaffs_WriteCheckpointSum(dev);
4467 }
4468
4469
4470 if(!yaffs_CheckpointClose(dev))
4471 ok = 0;
4472
4473 if(ok)
4474 dev->isCheckpointed = 1;
4475 else
4476 dev->isCheckpointed = 0;
4477
4478 return dev->isCheckpointed;
4479 }
4480
4481 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4482 {
4483 int ok = 1;
4484
4485 if(dev->skipCheckpointRead || !dev->isYaffs2){
4486 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
4487 ok = 0;
4488 }
4489
4490 if(ok)
4491 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
4492
4493 if(ok){
4494 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4495 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
4496 }
4497 if(ok){
4498 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
4499 ok = yaffs_ReadCheckpointDevice(dev);
4500 }
4501 if(ok){
4502 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
4503 ok = yaffs_ReadCheckpointObjects(dev);
4504 }
4505 if(ok){
4506 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4507 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
4508 }
4509
4510 if(ok){
4511 ok = yaffs_ReadCheckpointSum(dev);
4512 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
4513 }
4514
4515 if(!yaffs_CheckpointClose(dev))
4516 ok = 0;
4517
4518 if(ok)
4519 dev->isCheckpointed = 1;
4520 else
4521 dev->isCheckpointed = 0;
4522
4523 return ok ? 1 : 0;
4524
4525 }
4526
4527 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4528 {
4529 if(dev->isCheckpointed ||
4530 dev->blocksInCheckpoint > 0){
4531 dev->isCheckpointed = 0;
4532 yaffs_CheckpointInvalidateStream(dev);
4533 if(dev->superBlock && dev->markSuperBlockDirty)
4534 dev->markSuperBlockDirty(dev->superBlock);
4535 }
4536 }
4537
4538
4539 int yaffs_CheckpointSave(yaffs_Device *dev)
4540 {
4541
4542 T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4543
4544 yaffs_VerifyObjects(dev);
4545 yaffs_VerifyBlocks(dev);
4546 yaffs_VerifyFreeChunks(dev);
4547
4548 if(!dev->isCheckpointed) {
4549 yaffs_InvalidateCheckpoint(dev);
4550 yaffs_WriteCheckpointData(dev);
4551 }
4552
4553 T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4554
4555 return dev->isCheckpointed;
4556 }
4557
4558 int yaffs_CheckpointRestore(yaffs_Device *dev)
4559 {
4560 int retval;
4561 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4562
4563 retval = yaffs_ReadCheckpointData(dev);
4564
4565 if(dev->isCheckpointed){
4566 yaffs_VerifyObjects(dev);
4567 yaffs_VerifyBlocks(dev);
4568 yaffs_VerifyFreeChunks(dev);
4569 }
4570
4571 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4572
4573 return retval;
4574 }
4575
4576 /*--------------------- File read/write ------------------------
4577 * Read and write have very similar structures.
4578 * In general the read/write has three parts to it
4579 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4580 * Some complete chunks
4581 * An incomplete chunk to end off with
4582 *
4583 * Curve-balls: the first chunk might also be the last chunk.
4584 */
4585
4586 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
4587 int nBytes)
4588 {
4589
4590 int chunk;
4591 int start;
4592 int nToCopy;
4593 int n = nBytes;
4594 int nDone = 0;
4595 yaffs_ChunkCache *cache;
4596
4597 yaffs_Device *dev;
4598
4599 dev = in->myDev;
4600
4601 while (n > 0) {
4602 //chunk = offset / dev->nDataBytesPerChunk + 1;
4603 //start = offset % dev->nDataBytesPerChunk;
4604 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4605 chunk++;
4606
4607 /* OK now check for the curveball where the start and end are in
4608 * the same chunk.
4609 */
4610 if ((start + n) < dev->nDataBytesPerChunk) {
4611 nToCopy = n;
4612 } else {
4613 nToCopy = dev->nDataBytesPerChunk - start;
4614 }
4615
4616 cache = yaffs_FindChunkCache(in, chunk);
4617
4618 /* If the chunk is already in the cache or it is less than a whole chunk
4619 * then use the cache (if there is caching)
4620 * else bypass the cache.
4621 */
4622 if (cache || nToCopy != dev->nDataBytesPerChunk) {
4623 if (dev->nShortOpCaches > 0) {
4624
4625 /* If we can't find the data in the cache, then load it up. */
4626
4627 if (!cache) {
4628 cache = yaffs_GrabChunkCache(in->myDev);
4629 cache->object = in;
4630 cache->chunkId = chunk;
4631 cache->dirty = 0;
4632 cache->locked = 0;
4633 yaffs_ReadChunkDataFromObject(in, chunk,
4634 cache->
4635 data);
4636 cache->nBytes = 0;
4637 }
4638
4639 yaffs_UseChunkCache(dev, cache, 0);
4640
4641 cache->locked = 1;
4642
4643 #ifdef CONFIG_YAFFS_WINCE
4644 yfsd_UnlockYAFFS(TRUE);
4645 #endif
4646 memcpy(buffer, &cache->data[start], nToCopy);
4647
4648 #ifdef CONFIG_YAFFS_WINCE
4649 yfsd_LockYAFFS(TRUE);
4650 #endif
4651 cache->locked = 0;
4652 } else {
4653 /* Read into the local buffer then copy..*/
4654
4655 __u8 *localBuffer =
4656 yaffs_GetTempBuffer(dev, __LINE__);
4657 yaffs_ReadChunkDataFromObject(in, chunk,
4658 localBuffer);
4659 #ifdef CONFIG_YAFFS_WINCE
4660 yfsd_UnlockYAFFS(TRUE);
4661 #endif
4662 memcpy(buffer, &localBuffer[start], nToCopy);
4663
4664 #ifdef CONFIG_YAFFS_WINCE
4665 yfsd_LockYAFFS(TRUE);
4666 #endif
4667 yaffs_ReleaseTempBuffer(dev, localBuffer,
4668 __LINE__);
4669 }
4670
4671 } else {
4672 #ifdef CONFIG_YAFFS_WINCE
4673 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4674
4675 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4676 * This is because we otherwise screw up WinCE's memory mapper
4677 */
4678 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
4679
4680 #ifdef CONFIG_YAFFS_WINCE
4681 yfsd_UnlockYAFFS(TRUE);
4682 #endif
4683 memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
4684
4685 #ifdef CONFIG_YAFFS_WINCE
4686 yfsd_LockYAFFS(TRUE);
4687 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4688 #endif
4689
4690 #else
4691 /* A full chunk. Read directly into the supplied buffer. */
4692 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4693 #endif
4694 }
4695
4696 n -= nToCopy;
4697 offset += nToCopy;
4698 buffer += nToCopy;
4699 nDone += nToCopy;
4700
4701 }
4702
4703 return nDone;
4704 }
4705
4706 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
4707 int nBytes, int writeThrough)
4708 {
4709
4710 int chunk;
4711 int start;
4712 int nToCopy;
4713 int n = nBytes;
4714 int nDone = 0;
4715 int nToWriteBack;
4716 int startOfWrite = offset;
4717 int chunkWritten = 0;
4718 int nBytesRead;
4719
4720 yaffs_Device *dev;
4721
4722 dev = in->myDev;
4723
4724 while (n > 0 && chunkWritten >= 0) {
4725 //chunk = offset / dev->nDataBytesPerChunk + 1;
4726 //start = offset % dev->nDataBytesPerChunk;
4727 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4728 chunk++;
4729
4730 /* OK now check for the curveball where the start and end are in
4731 * the same chunk.
4732 */
4733
4734 if ((start + n) < dev->nDataBytesPerChunk) {
4735 nToCopy = n;
4736
4737 /* Now folks, to calculate how many bytes to write back....
4738 * If we're overwriting and not writing to then end of file then
4739 * we need to write back as much as was there before.
4740 */
4741
4742 nBytesRead =
4743 in->variant.fileVariant.fileSize -
4744 ((chunk - 1) * dev->nDataBytesPerChunk);
4745
4746 if (nBytesRead > dev->nDataBytesPerChunk) {
4747 nBytesRead = dev->nDataBytesPerChunk;
4748 }
4749
4750 nToWriteBack =
4751 (nBytesRead >
4752 (start + n)) ? nBytesRead : (start + n);
4753
4754 } else {
4755 nToCopy = dev->nDataBytesPerChunk - start;
4756 nToWriteBack = dev->nDataBytesPerChunk;
4757 }
4758
4759 if (nToCopy != dev->nDataBytesPerChunk) {
4760 /* An incomplete start or end chunk (or maybe both start and end chunk) */
4761 if (dev->nShortOpCaches > 0) {
4762 yaffs_ChunkCache *cache;
4763 /* If we can't find the data in the cache, then load the cache */
4764 cache = yaffs_FindChunkCache(in, chunk);
4765
4766 if (!cache
4767 && yaffs_CheckSpaceForAllocation(in->
4768 myDev)) {
4769 cache = yaffs_GrabChunkCache(in->myDev);
4770 cache->object = in;
4771 cache->chunkId = chunk;
4772 cache->dirty = 0;
4773 cache->locked = 0;
4774 yaffs_ReadChunkDataFromObject(in, chunk,
4775 cache->
4776 data);
4777 }
4778 else if(cache &&
4779 !cache->dirty &&
4780 !yaffs_CheckSpaceForAllocation(in->myDev)){
4781 /* Drop the cache if it was a read cache item and
4782 * no space check has been made for it.
4783 */
4784 cache = NULL;
4785 }
4786
4787 if (cache) {
4788 yaffs_UseChunkCache(dev, cache, 1);
4789 cache->locked = 1;
4790 #ifdef CONFIG_YAFFS_WINCE
4791 yfsd_UnlockYAFFS(TRUE);
4792 #endif
4793
4794 memcpy(&cache->data[start], buffer,
4795 nToCopy);
4796
4797 #ifdef CONFIG_YAFFS_WINCE
4798 yfsd_LockYAFFS(TRUE);
4799 #endif
4800 cache->locked = 0;
4801 cache->nBytes = nToWriteBack;
4802
4803 if (writeThrough) {
4804 chunkWritten =
4805 yaffs_WriteChunkDataToObject
4806 (cache->object,
4807 cache->chunkId,
4808 cache->data, cache->nBytes,
4809 1);
4810 cache->dirty = 0;
4811 }
4812
4813 } else {
4814 chunkWritten = -1; /* fail the write */
4815 }
4816 } else {
4817 /* An incomplete start or end chunk (or maybe both start and end chunk)
4818 * Read into the local buffer then copy, then copy over and write back.
4819 */
4820
4821 __u8 *localBuffer =
4822 yaffs_GetTempBuffer(dev, __LINE__);
4823
4824 yaffs_ReadChunkDataFromObject(in, chunk,
4825 localBuffer);
4826
4827 #ifdef CONFIG_YAFFS_WINCE
4828 yfsd_UnlockYAFFS(TRUE);
4829 #endif
4830
4831 memcpy(&localBuffer[start], buffer, nToCopy);
4832
4833 #ifdef CONFIG_YAFFS_WINCE
4834 yfsd_LockYAFFS(TRUE);
4835 #endif
4836 chunkWritten =
4837 yaffs_WriteChunkDataToObject(in, chunk,
4838 localBuffer,
4839 nToWriteBack,
4840 0);
4841
4842 yaffs_ReleaseTempBuffer(dev, localBuffer,
4843 __LINE__);
4844
4845 }
4846
4847 } else {
4848
4849 #ifdef CONFIG_YAFFS_WINCE
4850 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4851 * This is because we otherwise screw up WinCE's memory mapper
4852 */
4853 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4854 #ifdef CONFIG_YAFFS_WINCE
4855 yfsd_UnlockYAFFS(TRUE);
4856 #endif
4857 memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
4858 #ifdef CONFIG_YAFFS_WINCE
4859 yfsd_LockYAFFS(TRUE);
4860 #endif
4861 chunkWritten =
4862 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
4863 dev->nDataBytesPerChunk,
4864 0);
4865 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4866 #else
4867 /* A full chunk. Write directly from the supplied buffer. */
4868 chunkWritten =
4869 yaffs_WriteChunkDataToObject(in, chunk, buffer,
4870 dev->nDataBytesPerChunk,
4871 0);
4872 #endif
4873 /* Since we've overwritten the cached data, we better invalidate it. */
4874 yaffs_InvalidateChunkCache(in, chunk);
4875 }
4876
4877 if (chunkWritten >= 0) {
4878 n -= nToCopy;
4879 offset += nToCopy;
4880 buffer += nToCopy;
4881 nDone += nToCopy;
4882 }
4883
4884 }
4885
4886 /* Update file object */
4887
4888 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
4889 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4890 }
4891
4892 in->dirty = 1;
4893
4894 return nDone;
4895 }
4896
4897
4898 /* ---------------------- File resizing stuff ------------------ */
4899
4900 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
4901 {
4902
4903 yaffs_Device *dev = in->myDev;
4904 int oldFileSize = in->variant.fileVariant.fileSize;
4905
4906 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4907
4908 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4909 dev->nDataBytesPerChunk;
4910 int i;
4911 int chunkId;
4912
4913 /* Delete backwards so that we don't end up with holes if
4914 * power is lost part-way through the operation.
4915 */
4916 for (i = lastDel; i >= startDel; i--) {
4917 /* NB this could be optimised somewhat,
4918 * eg. could retrieve the tags and write them without
4919 * using yaffs_DeleteChunk
4920 */
4921
4922 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4923 if (chunkId > 0) {
4924 if (chunkId <
4925 (dev->internalStartBlock * dev->nChunksPerBlock)
4926 || chunkId >=
4927 ((dev->internalEndBlock +
4928 1) * dev->nChunksPerBlock)) {
4929 T(YAFFS_TRACE_ALWAYS,
4930 (TSTR("Found daft chunkId %d for %d" TENDSTR),
4931 chunkId, i));
4932 } else {
4933 in->nDataChunks--;
4934 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4935 }
4936 }
4937 }
4938
4939 }
4940
4941 int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
4942 {
4943
4944 int oldFileSize = in->variant.fileVariant.fileSize;
4945 int newSizeOfPartialChunk;
4946 int newFullChunks;
4947
4948 yaffs_Device *dev = in->myDev;
4949
4950 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4951
4952 yaffs_FlushFilesChunkCache(in);
4953 yaffs_InvalidateWholeChunkCache(in);
4954
4955 yaffs_CheckGarbageCollection(dev);
4956
4957 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
4958 return yaffs_GetFileSize(in);
4959 }
4960
4961 if (newSize == oldFileSize) {
4962 return oldFileSize;
4963 }
4964
4965 if (newSize < oldFileSize) {
4966
4967 yaffs_PruneResizedChunks(in, newSize);
4968
4969 if (newSizeOfPartialChunk != 0) {
4970 int lastChunk = 1 + newFullChunks;
4971
4972 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4973
4974 /* Got to read and rewrite the last chunk with its new size and zero pad */
4975 yaffs_ReadChunkDataFromObject(in, lastChunk,
4976 localBuffer);
4977
4978 memset(localBuffer + newSizeOfPartialChunk, 0,
4979 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
4980
4981 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
4982 newSizeOfPartialChunk, 1);
4983
4984 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4985 }
4986
4987 in->variant.fileVariant.fileSize = newSize;
4988
4989 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
4990 } else {
4991 /* newsSize > oldFileSize */
4992 in->variant.fileVariant.fileSize = newSize;
4993 }
4994
4995
4996
4997 /* Write a new object header.
4998 * show we've shrunk the file, if need be
4999 * Do this only if the file is not in the deleted directories.
5000 */
5001 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5002 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
5003 yaffs_UpdateObjectHeader(in, NULL, 0,
5004 (newSize < oldFileSize) ? 1 : 0, 0);
5005 }
5006
5007 return newSize;
5008 }
5009
5010 loff_t yaffs_GetFileSize(yaffs_Object * obj)
5011 {
5012 obj = yaffs_GetEquivalentObject(obj);
5013
5014 switch (obj->variantType) {
5015 case YAFFS_OBJECT_TYPE_FILE:
5016 return obj->variant.fileVariant.fileSize;
5017 case YAFFS_OBJECT_TYPE_SYMLINK:
5018 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5019 default:
5020 return 0;
5021 }
5022 }
5023
5024
5025
5026 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
5027 {
5028 int retVal;
5029 if (in->dirty) {
5030 yaffs_FlushFilesChunkCache(in);
5031 if (updateTime) {
5032 #ifdef CONFIG_YAFFS_WINCE
5033 yfsd_WinFileTimeNow(in->win_mtime);
5034 #else
5035
5036 in->yst_mtime = Y_CURRENT_TIME;
5037
5038 #endif
5039 }
5040
5041 retVal =
5042 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5043 0) ? YAFFS_OK : YAFFS_FAIL;
5044 } else {
5045 retVal = YAFFS_OK;
5046 }
5047
5048 return retVal;
5049
5050 }
5051
5052 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
5053 {
5054
5055 /* First off, invalidate the file's data in the cache, without flushing. */
5056 yaffs_InvalidateWholeChunkCache(in);
5057
5058 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5059 /* Move to the unlinked directory so we have a record that it was deleted. */
5060 yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
5061
5062 }
5063
5064 yaffs_RemoveObjectFromDirectory(in);
5065 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
5066 in->chunkId = -1;
5067
5068 yaffs_FreeObject(in);
5069 return YAFFS_OK;
5070
5071 }
5072
5073 /* yaffs_DeleteFile deletes the whole file data
5074 * and the inode associated with the file.
5075 * It does not delete the links associated with the file.
5076 */
5077 static int yaffs_UnlinkFile(yaffs_Object * in)
5078 {
5079
5080 int retVal;
5081 int immediateDeletion = 0;
5082
5083 if (1) {
5084 #ifdef __KERNEL__
5085 if (!in->myInode) {
5086 immediateDeletion = 1;
5087
5088 }
5089 #else
5090 if (in->inUse <= 0) {
5091 immediateDeletion = 1;
5092
5093 }
5094 #endif
5095 if (immediateDeletion) {
5096 retVal =
5097 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5098 "deleted", 0, 0);
5099 T(YAFFS_TRACE_TRACING,
5100 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5101 in->objectId));
5102 in->deleted = 1;
5103 in->myDev->nDeletedFiles++;
5104 if (0 && in->myDev->isYaffs2) {
5105 yaffs_ResizeFile(in, 0);
5106 }
5107 yaffs_SoftDeleteFile(in);
5108 } else {
5109 retVal =
5110 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5111 "unlinked", 0, 0);
5112 }
5113
5114 }
5115 return retVal;
5116 }
5117
5118 int yaffs_DeleteFile(yaffs_Object * in)
5119 {
5120 int retVal = YAFFS_OK;
5121
5122 if (in->nDataChunks > 0) {
5123 /* Use soft deletion if there is data in the file */
5124 if (!in->unlinked) {
5125 retVal = yaffs_UnlinkFile(in);
5126 }
5127 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5128 in->deleted = 1;
5129 in->myDev->nDeletedFiles++;
5130 yaffs_SoftDeleteFile(in);
5131 }
5132 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
5133 } else {
5134 /* The file has no data chunks so we toss it immediately */
5135 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5136 in->variant.fileVariant.top = NULL;
5137 yaffs_DoGenericObjectDeletion(in);
5138
5139 return YAFFS_OK;
5140 }
5141 }
5142
5143 static int yaffs_DeleteDirectory(yaffs_Object * in)
5144 {
5145 /* First check that the directory is empty. */
5146 if (list_empty(&in->variant.directoryVariant.children)) {
5147 return yaffs_DoGenericObjectDeletion(in);
5148 }
5149
5150 return YAFFS_FAIL;
5151
5152 }
5153
5154 static int yaffs_DeleteSymLink(yaffs_Object * in)
5155 {
5156 YFREE(in->variant.symLinkVariant.alias);
5157
5158 return yaffs_DoGenericObjectDeletion(in);
5159 }
5160
5161 static int yaffs_DeleteHardLink(yaffs_Object * in)
5162 {
5163 /* remove this hardlink from the list assocaited with the equivalent
5164 * object
5165 */
5166 list_del(&in->hardLinks);
5167 return yaffs_DoGenericObjectDeletion(in);
5168 }
5169
5170 static void yaffs_DestroyObject(yaffs_Object * obj)
5171 {
5172 switch (obj->variantType) {
5173 case YAFFS_OBJECT_TYPE_FILE:
5174 yaffs_DeleteFile(obj);
5175 break;
5176 case YAFFS_OBJECT_TYPE_DIRECTORY:
5177 yaffs_DeleteDirectory(obj);
5178 break;
5179 case YAFFS_OBJECT_TYPE_SYMLINK:
5180 yaffs_DeleteSymLink(obj);
5181 break;
5182 case YAFFS_OBJECT_TYPE_HARDLINK:
5183 yaffs_DeleteHardLink(obj);
5184 break;
5185 case YAFFS_OBJECT_TYPE_SPECIAL:
5186 yaffs_DoGenericObjectDeletion(obj);
5187 break;
5188 case YAFFS_OBJECT_TYPE_UNKNOWN:
5189 break; /* should not happen. */
5190 }
5191 }
5192
5193 static int yaffs_UnlinkWorker(yaffs_Object * obj)
5194 {
5195
5196 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5197 return yaffs_DeleteHardLink(obj);
5198 } else if (!list_empty(&obj->hardLinks)) {
5199 /* Curve ball: We're unlinking an object that has a hardlink.
5200 *
5201 * This problem arises because we are not strictly following
5202 * The Linux link/inode model.
5203 *
5204 * We can't really delete the object.
5205 * Instead, we do the following:
5206 * - Select a hardlink.
5207 * - Unhook it from the hard links
5208 * - Unhook it from its parent directory (so that the rename can work)
5209 * - Rename the object to the hardlink's name.
5210 * - Delete the hardlink
5211 */
5212
5213 yaffs_Object *hl;
5214 int retVal;
5215 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5216
5217 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5218
5219 list_del_init(&hl->hardLinks);
5220 list_del_init(&hl->siblings);
5221
5222 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5223
5224 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5225
5226 if (retVal == YAFFS_OK) {
5227 retVal = yaffs_DoGenericObjectDeletion(hl);
5228 }
5229 return retVal;
5230
5231 } else {
5232 switch (obj->variantType) {
5233 case YAFFS_OBJECT_TYPE_FILE:
5234 return yaffs_UnlinkFile(obj);
5235 break;
5236 case YAFFS_OBJECT_TYPE_DIRECTORY:
5237 return yaffs_DeleteDirectory(obj);
5238 break;
5239 case YAFFS_OBJECT_TYPE_SYMLINK:
5240 return yaffs_DeleteSymLink(obj);
5241 break;
5242 case YAFFS_OBJECT_TYPE_SPECIAL:
5243 return yaffs_DoGenericObjectDeletion(obj);
5244 break;
5245 case YAFFS_OBJECT_TYPE_HARDLINK:
5246 case YAFFS_OBJECT_TYPE_UNKNOWN:
5247 default:
5248 return YAFFS_FAIL;
5249 }
5250 }
5251 }
5252
5253
5254 static int yaffs_UnlinkObject( yaffs_Object *obj)
5255 {
5256
5257 if (obj && obj->unlinkAllowed) {
5258 return yaffs_UnlinkWorker(obj);
5259 }
5260
5261 return YAFFS_FAIL;
5262
5263 }
5264 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
5265 {
5266 yaffs_Object *obj;
5267
5268 obj = yaffs_FindObjectByName(dir, name);
5269 return yaffs_UnlinkObject(obj);
5270 }
5271
5272 /*----------------------- Initialisation Scanning ---------------------- */
5273
5274 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
5275 int backwardScanning)
5276 {
5277 yaffs_Object *obj;
5278
5279 if (!backwardScanning) {
5280 /* Handle YAFFS1 forward scanning case
5281 * For YAFFS1 we always do the deletion
5282 */
5283
5284 } else {
5285 /* Handle YAFFS2 case (backward scanning)
5286 * If the shadowed object exists then ignore.
5287 */
5288 if (yaffs_FindObjectByNumber(dev, objId)) {
5289 return;
5290 }
5291 }
5292
5293 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5294 * We put it in unlinked dir to be cleaned up after the scanning
5295 */
5296 obj =
5297 yaffs_FindOrCreateObjectByNumber(dev, objId,
5298 YAFFS_OBJECT_TYPE_FILE);
5299 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5300 obj->variant.fileVariant.shrinkSize = 0;
5301 obj->valid = 1; /* So that we don't read any other info for this file */
5302
5303 }
5304
5305 typedef struct {
5306 int seq;
5307 int block;
5308 } yaffs_BlockIndex;
5309
5310
5311 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5312 {
5313 yaffs_Object *hl;
5314 yaffs_Object *in;
5315
5316 while (hardList) {
5317 hl = hardList;
5318 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5319
5320 in = yaffs_FindObjectByNumber(dev,
5321 hl->variant.hardLinkVariant.
5322 equivalentObjectId);
5323
5324 if (in) {
5325 /* Add the hardlink pointers */
5326 hl->variant.hardLinkVariant.equivalentObject = in;
5327 list_add(&hl->hardLinks, &in->hardLinks);
5328 } else {
5329 /* Todo Need to report/handle this better.
5330 * Got a problem... hardlink to a non-existant object
5331 */
5332 hl->variant.hardLinkVariant.equivalentObject = NULL;
5333 INIT_LIST_HEAD(&hl->hardLinks);
5334
5335 }
5336
5337 }
5338
5339 }
5340
5341
5342
5343
5344
5345 static int ybicmp(const void *a, const void *b){
5346 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5347 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5348 register int ablock = ((yaffs_BlockIndex *)a)->block;
5349 register int bblock = ((yaffs_BlockIndex *)b)->block;
5350 if( aseq == bseq )
5351 return ablock - bblock;
5352 else
5353 return aseq - bseq;
5354
5355 }
5356
5357 static int yaffs_Scan(yaffs_Device * dev)
5358 {
5359 yaffs_ExtendedTags tags;
5360 int blk;
5361 int blockIterator;
5362 int startIterator;
5363 int endIterator;
5364 int nBlocksToScan = 0;
5365 int result;
5366
5367 int chunk;
5368 int c;
5369 int deleted;
5370 yaffs_BlockState state;
5371 yaffs_Object *hardList = NULL;
5372 yaffs_BlockInfo *bi;
5373 int sequenceNumber;
5374 yaffs_ObjectHeader *oh;
5375 yaffs_Object *in;
5376 yaffs_Object *parent;
5377 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5378
5379 int alloc_failed = 0;
5380
5381
5382 __u8 *chunkData;
5383
5384 yaffs_BlockIndex *blockIndex = NULL;
5385
5386 if (dev->isYaffs2) {
5387 T(YAFFS_TRACE_SCAN,
5388 (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
5389 return YAFFS_FAIL;
5390 }
5391
5392 //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
5393
5394 T(YAFFS_TRACE_SCAN,
5395 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5396 dev->internalStartBlock, dev->internalEndBlock));
5397
5398 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5399
5400 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5401
5402 if (dev->isYaffs2) {
5403 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5404 if(!blockIndex)
5405 return YAFFS_FAIL;
5406 }
5407
5408 /* Scan all the blocks to determine their state */
5409 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5410 bi = yaffs_GetBlockInfo(dev, blk);
5411 yaffs_ClearChunkBits(dev, blk);
5412 bi->pagesInUse = 0;
5413 bi->softDeletions = 0;
5414
5415 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5416
5417 bi->blockState = state;
5418 bi->sequenceNumber = sequenceNumber;
5419
5420 T(YAFFS_TRACE_SCAN_DEBUG,
5421 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5422 state, sequenceNumber));
5423
5424 if (state == YAFFS_BLOCK_STATE_DEAD) {
5425 T(YAFFS_TRACE_BAD_BLOCKS,
5426 (TSTR("block %d is bad" TENDSTR), blk));
5427 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5428 T(YAFFS_TRACE_SCAN_DEBUG,
5429 (TSTR("Block empty " TENDSTR)));
5430 dev->nErasedBlocks++;
5431 dev->nFreeChunks += dev->nChunksPerBlock;
5432 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5433
5434 /* Determine the highest sequence number */
5435 if (dev->isYaffs2 &&
5436 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5437 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5438
5439 blockIndex[nBlocksToScan].seq = sequenceNumber;
5440 blockIndex[nBlocksToScan].block = blk;
5441
5442 nBlocksToScan++;
5443
5444 if (sequenceNumber >= dev->sequenceNumber) {
5445 dev->sequenceNumber = sequenceNumber;
5446 }
5447 } else if (dev->isYaffs2) {
5448 /* TODO: Nasty sequence number! */
5449 T(YAFFS_TRACE_SCAN,
5450 (TSTR
5451 ("Block scanning block %d has bad sequence number %d"
5452 TENDSTR), blk, sequenceNumber));
5453
5454 }
5455 }
5456 }
5457
5458 /* Sort the blocks
5459 * Dungy old bubble sort for now...
5460 */
5461 if (dev->isYaffs2) {
5462 yaffs_BlockIndex temp;
5463 int i;
5464 int j;
5465
5466 for (i = 0; i < nBlocksToScan; i++)
5467 for (j = i + 1; j < nBlocksToScan; j++)
5468 if (blockIndex[i].seq > blockIndex[j].seq) {
5469 temp = blockIndex[j];
5470 blockIndex[j] = blockIndex[i];
5471 blockIndex[i] = temp;
5472 }
5473 }
5474
5475 /* Now scan the blocks looking at the data. */
5476 if (dev->isYaffs2) {
5477 startIterator = 0;
5478 endIterator = nBlocksToScan - 1;
5479 T(YAFFS_TRACE_SCAN_DEBUG,
5480 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5481 } else {
5482 startIterator = dev->internalStartBlock;
5483 endIterator = dev->internalEndBlock;
5484 }
5485
5486 /* For each block.... */
5487 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5488 blockIterator++) {
5489
5490 if (dev->isYaffs2) {
5491 /* get the block to scan in the correct order */
5492 blk = blockIndex[blockIterator].block;
5493 } else {
5494 blk = blockIterator;
5495 }
5496
5497 bi = yaffs_GetBlockInfo(dev, blk);
5498 state = bi->blockState;
5499
5500 deleted = 0;
5501
5502 /* For each chunk in each block that needs scanning....*/
5503 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5504 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5505 /* Read the tags and decide what to do */
5506 chunk = blk * dev->nChunksPerBlock + c;
5507
5508 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5509 &tags);
5510
5511 /* Let's have a good look at this chunk... */
5512
5513 if (!dev->isYaffs2 && tags.chunkDeleted) {
5514 /* YAFFS1 only...
5515 * A deleted chunk
5516 */
5517 deleted++;
5518 dev->nFreeChunks++;
5519 /*T((" %d %d deleted\n",blk,c)); */
5520 } else if (!tags.chunkUsed) {
5521 /* An unassigned chunk in the block
5522 * This means that either the block is empty or
5523 * this is the one being allocated from
5524 */
5525
5526 if (c == 0) {
5527 /* We're looking at the first chunk in the block so the block is unused */
5528 state = YAFFS_BLOCK_STATE_EMPTY;
5529 dev->nErasedBlocks++;
5530 } else {
5531 /* this is the block being allocated from */
5532 T(YAFFS_TRACE_SCAN,
5533 (TSTR
5534 (" Allocating from %d %d" TENDSTR),
5535 blk, c));
5536 state = YAFFS_BLOCK_STATE_ALLOCATING;
5537 dev->allocationBlock = blk;
5538 dev->allocationPage = c;
5539 dev->allocationBlockFinder = blk;
5540 /* Set it to here to encourage the allocator to go forth from here. */
5541
5542 /* Yaffs2 sanity check:
5543 * This should be the one with the highest sequence number
5544 */
5545 if (dev->isYaffs2
5546 && (dev->sequenceNumber !=
5547 bi->sequenceNumber)) {
5548 T(YAFFS_TRACE_ALWAYS,
5549 (TSTR
5550 ("yaffs: Allocation block %d was not highest sequence id:"
5551 " block seq = %d, dev seq = %d"
5552 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
5553 }
5554 }
5555
5556 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5557 } else if (tags.chunkId > 0) {
5558 /* chunkId > 0 so it is a data chunk... */
5559 unsigned int endpos;
5560
5561 yaffs_SetChunkBit(dev, blk, c);
5562 bi->pagesInUse++;
5563
5564 in = yaffs_FindOrCreateObjectByNumber(dev,
5565 tags.
5566 objectId,
5567 YAFFS_OBJECT_TYPE_FILE);
5568 /* PutChunkIntoFile checks for a clash (two data chunks with
5569 * the same chunkId).
5570 */
5571
5572 if(!in)
5573 alloc_failed = 1;
5574
5575 if(in){
5576 if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
5577 alloc_failed = 1;
5578 }
5579
5580 endpos =
5581 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5582 tags.byteCount;
5583 if (in &&
5584 in->variantType == YAFFS_OBJECT_TYPE_FILE
5585 && in->variant.fileVariant.scannedFileSize <
5586 endpos) {
5587 in->variant.fileVariant.
5588 scannedFileSize = endpos;
5589 if (!dev->useHeaderFileSize) {
5590 in->variant.fileVariant.
5591 fileSize =
5592 in->variant.fileVariant.
5593 scannedFileSize;
5594 }
5595
5596 }
5597 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5598 } else {
5599 /* chunkId == 0, so it is an ObjectHeader.
5600 * Thus, we read in the object header and make the object
5601 */
5602 yaffs_SetChunkBit(dev, blk, c);
5603 bi->pagesInUse++;
5604
5605 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5606 chunkData,
5607 NULL);
5608
5609 oh = (yaffs_ObjectHeader *) chunkData;
5610
5611 in = yaffs_FindObjectByNumber(dev,
5612 tags.objectId);
5613 if (in && in->variantType != oh->type) {
5614 /* This should not happen, but somehow
5615 * Wev'e ended up with an objectId that has been reused but not yet
5616 * deleted, and worse still it has changed type. Delete the old object.
5617 */
5618
5619 yaffs_DestroyObject(in);
5620
5621 in = 0;
5622 }
5623
5624 in = yaffs_FindOrCreateObjectByNumber(dev,
5625 tags.
5626 objectId,
5627 oh->type);
5628
5629 if(!in)
5630 alloc_failed = 1;
5631
5632 if (in && oh->shadowsObject > 0) {
5633 yaffs_HandleShadowedObject(dev,
5634 oh->
5635 shadowsObject,
5636 0);
5637 }
5638
5639 if (in && in->valid) {
5640 /* We have already filled this one. We have a duplicate and need to resolve it. */
5641
5642 unsigned existingSerial = in->serial;
5643 unsigned newSerial = tags.serialNumber;
5644
5645 if (dev->isYaffs2 ||
5646 ((existingSerial + 1) & 3) ==
5647 newSerial) {
5648 /* Use new one - destroy the exisiting one */
5649 yaffs_DeleteChunk(dev,
5650 in->chunkId,
5651 1, __LINE__);
5652 in->valid = 0;
5653 } else {
5654 /* Use existing - destroy this one. */
5655 yaffs_DeleteChunk(dev, chunk, 1,
5656 __LINE__);
5657 }
5658 }
5659
5660 if (in && !in->valid &&
5661 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5662 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5663 /* We only load some info, don't fiddle with directory structure */
5664 in->valid = 1;
5665 in->variantType = oh->type;
5666
5667 in->yst_mode = oh->yst_mode;
5668 #ifdef CONFIG_YAFFS_WINCE
5669 in->win_atime[0] = oh->win_atime[0];
5670 in->win_ctime[0] = oh->win_ctime[0];
5671 in->win_mtime[0] = oh->win_mtime[0];
5672 in->win_atime[1] = oh->win_atime[1];
5673 in->win_ctime[1] = oh->win_ctime[1];
5674 in->win_mtime[1] = oh->win_mtime[1];
5675 #else
5676 in->yst_uid = oh->yst_uid;
5677 in->yst_gid = oh->yst_gid;
5678 in->yst_atime = oh->yst_atime;
5679 in->yst_mtime = oh->yst_mtime;
5680 in->yst_ctime = oh->yst_ctime;
5681 in->yst_rdev = oh->yst_rdev;
5682 #endif
5683 in->chunkId = chunk;
5684
5685 } else if (in && !in->valid) {
5686 /* we need to load this info */
5687
5688 in->valid = 1;
5689 in->variantType = oh->type;
5690
5691 in->yst_mode = oh->yst_mode;
5692 #ifdef CONFIG_YAFFS_WINCE
5693 in->win_atime[0] = oh->win_atime[0];
5694 in->win_ctime[0] = oh->win_ctime[0];
5695 in->win_mtime[0] = oh->win_mtime[0];
5696 in->win_atime[1] = oh->win_atime[1];
5697 in->win_ctime[1] = oh->win_ctime[1];
5698 in->win_mtime[1] = oh->win_mtime[1];
5699 #else
5700 in->yst_uid = oh->yst_uid;
5701 in->yst_gid = oh->yst_gid;
5702 in->yst_atime = oh->yst_atime;
5703 in->yst_mtime = oh->yst_mtime;
5704 in->yst_ctime = oh->yst_ctime;
5705 in->yst_rdev = oh->yst_rdev;
5706 #endif
5707 in->chunkId = chunk;
5708
5709 yaffs_SetObjectName(in, oh->name);
5710 in->dirty = 0;
5711
5712 /* directory stuff...
5713 * hook up to parent
5714 */
5715
5716 parent =
5717 yaffs_FindOrCreateObjectByNumber
5718 (dev, oh->parentObjectId,
5719 YAFFS_OBJECT_TYPE_DIRECTORY);
5720 if (parent->variantType ==
5721 YAFFS_OBJECT_TYPE_UNKNOWN) {
5722 /* Set up as a directory */
5723 parent->variantType =
5724 YAFFS_OBJECT_TYPE_DIRECTORY;
5725 INIT_LIST_HEAD(&parent->variant.
5726 directoryVariant.
5727 children);
5728 } else if (parent->variantType !=
5729 YAFFS_OBJECT_TYPE_DIRECTORY)
5730 {
5731 /* Hoosterman, another problem....
5732 * We're trying to use a non-directory as a directory
5733 */
5734
5735 T(YAFFS_TRACE_ERROR,
5736 (TSTR
5737 ("yaffs tragedy: attempting to use non-directory as"
5738 " a directory in scan. Put in lost+found."
5739 TENDSTR)));
5740 parent = dev->lostNFoundDir;
5741 }
5742
5743 yaffs_AddObjectToDirectory(parent, in);
5744
5745 if (0 && (parent == dev->deletedDir ||
5746 parent == dev->unlinkedDir)) {
5747 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
5748 dev->nDeletedFiles++;
5749 }
5750 /* Note re hardlinks.
5751 * Since we might scan a hardlink before its equivalent object is scanned
5752 * we put them all in a list.
5753 * After scanning is complete, we should have all the objects, so we run through this
5754 * list and fix up all the chains.
5755 */
5756
5757 switch (in->variantType) {
5758 case YAFFS_OBJECT_TYPE_UNKNOWN:
5759 /* Todo got a problem */
5760 break;
5761 case YAFFS_OBJECT_TYPE_FILE:
5762 if (dev->isYaffs2
5763 && oh->isShrink) {
5764 /* Prune back the shrunken chunks */
5765 yaffs_PruneResizedChunks
5766 (in, oh->fileSize);
5767 /* Mark the block as having a shrinkHeader */
5768 bi->hasShrinkHeader = 1;
5769 }
5770
5771 if (dev->useHeaderFileSize)
5772
5773 in->variant.fileVariant.
5774 fileSize =
5775 oh->fileSize;
5776
5777 break;
5778 case YAFFS_OBJECT_TYPE_HARDLINK:
5779 in->variant.hardLinkVariant.
5780 equivalentObjectId =
5781 oh->equivalentObjectId;
5782 in->hardLinks.next =
5783 (struct list_head *)
5784 hardList;
5785 hardList = in;
5786 break;
5787 case YAFFS_OBJECT_TYPE_DIRECTORY:
5788 /* Do nothing */
5789 break;
5790 case YAFFS_OBJECT_TYPE_SPECIAL:
5791 /* Do nothing */
5792 break;
5793 case YAFFS_OBJECT_TYPE_SYMLINK:
5794 in->variant.symLinkVariant.alias =
5795 yaffs_CloneString(oh->alias);
5796 if(!in->variant.symLinkVariant.alias)
5797 alloc_failed = 1;
5798 break;
5799 }
5800
5801 if (parent == dev->deletedDir) {
5802 yaffs_DestroyObject(in);
5803 bi->hasShrinkHeader = 1;
5804 }
5805 }
5806 }
5807 }
5808
5809 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5810 /* If we got this far while scanning, then the block is fully allocated.*/
5811 state = YAFFS_BLOCK_STATE_FULL;
5812 }
5813
5814 bi->blockState = state;
5815
5816 /* Now let's see if it was dirty */
5817 if (bi->pagesInUse == 0 &&
5818 !bi->hasShrinkHeader &&
5819 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5820 yaffs_BlockBecameDirty(dev, blk);
5821 }
5822
5823 }
5824
5825 if (blockIndex) {
5826 YFREE(blockIndex);
5827 }
5828
5829
5830 /* Ok, we've done all the scanning.
5831 * Fix up the hard link chains.
5832 * We should now have scanned all the objects, now it's time to add these
5833 * hardlinks.
5834 */
5835
5836 yaffs_HardlinkFixup(dev,hardList);
5837
5838 /* Handle the unlinked files. Since they were left in an unlinked state we should
5839 * just delete them.
5840 */
5841 {
5842 struct list_head *i;
5843 struct list_head *n;
5844
5845 yaffs_Object *l;
5846 /* Soft delete all the unlinked files */
5847 list_for_each_safe(i, n,
5848 &dev->unlinkedDir->variant.directoryVariant.
5849 children) {
5850 if (i) {
5851 l = list_entry(i, yaffs_Object, siblings);
5852 yaffs_DestroyObject(l);
5853 }
5854 }
5855 }
5856
5857 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5858
5859 if(alloc_failed){
5860 return YAFFS_FAIL;
5861 }
5862
5863 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5864
5865
5866 return YAFFS_OK;
5867 }
5868
5869 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5870 {
5871 __u8 *chunkData;
5872 yaffs_ObjectHeader *oh;
5873 yaffs_Device *dev = in->myDev;
5874 yaffs_ExtendedTags tags;
5875 int result;
5876 int alloc_failed = 0;
5877
5878 if(!in)
5879 return;
5880
5881 #if 0
5882 T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
5883 in->objectId,
5884 in->lazyLoaded ? "not yet" : "already"));
5885 #endif
5886
5887 if(in->lazyLoaded){
5888 in->lazyLoaded = 0;
5889 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5890
5891 result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
5892 oh = (yaffs_ObjectHeader *) chunkData;
5893
5894 in->yst_mode = oh->yst_mode;
5895 #ifdef CONFIG_YAFFS_WINCE
5896 in->win_atime[0] = oh->win_atime[0];
5897 in->win_ctime[0] = oh->win_ctime[0];
5898 in->win_mtime[0] = oh->win_mtime[0];
5899 in->win_atime[1] = oh->win_atime[1];
5900 in->win_ctime[1] = oh->win_ctime[1];
5901 in->win_mtime[1] = oh->win_mtime[1];
5902 #else
5903 in->yst_uid = oh->yst_uid;
5904 in->yst_gid = oh->yst_gid;
5905 in->yst_atime = oh->yst_atime;
5906 in->yst_mtime = oh->yst_mtime;
5907 in->yst_ctime = oh->yst_ctime;
5908 in->yst_rdev = oh->yst_rdev;
5909
5910 #endif
5911 yaffs_SetObjectName(in, oh->name);
5912
5913 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
5914 in->variant.symLinkVariant.alias =
5915 yaffs_CloneString(oh->alias);
5916 if(!in->variant.symLinkVariant.alias)
5917 alloc_failed = 1; /* Not returned to caller */
5918 }
5919
5920 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
5921 }
5922 }
5923
5924 static int yaffs_ScanBackwards(yaffs_Device * dev)
5925 {
5926 yaffs_ExtendedTags tags;
5927 int blk;
5928 int blockIterator;
5929 int startIterator;
5930 int endIterator;
5931 int nBlocksToScan = 0;
5932
5933 int chunk;
5934 int result;
5935 int c;
5936 int deleted;
5937 yaffs_BlockState state;
5938 yaffs_Object *hardList = NULL;
5939 yaffs_BlockInfo *bi;
5940 int sequenceNumber;
5941 yaffs_ObjectHeader *oh;
5942 yaffs_Object *in;
5943 yaffs_Object *parent;
5944 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5945 int itsUnlinked;
5946 __u8 *chunkData;
5947
5948 int fileSize;
5949 int isShrink;
5950 int foundChunksInBlock;
5951 int equivalentObjectId;
5952 int alloc_failed = 0;
5953
5954
5955 yaffs_BlockIndex *blockIndex = NULL;
5956 int altBlockIndex = 0;
5957
5958 if (!dev->isYaffs2) {
5959 T(YAFFS_TRACE_SCAN,
5960 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5961 return YAFFS_FAIL;
5962 }
5963
5964 T(YAFFS_TRACE_SCAN,
5965 (TSTR
5966 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
5967 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5968
5969
5970 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5971
5972 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5973
5974 if(!blockIndex) {
5975 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
5976 altBlockIndex = 1;
5977 }
5978
5979 if(!blockIndex) {
5980 T(YAFFS_TRACE_SCAN,
5981 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
5982 return YAFFS_FAIL;
5983 }
5984
5985 dev->blocksInCheckpoint = 0;
5986
5987 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5988
5989 /* Scan all the blocks to determine their state */
5990 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5991 bi = yaffs_GetBlockInfo(dev, blk);
5992 yaffs_ClearChunkBits(dev, blk);
5993 bi->pagesInUse = 0;
5994 bi->softDeletions = 0;
5995
5996 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5997
5998 bi->blockState = state;
5999 bi->sequenceNumber = sequenceNumber;
6000
6001 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6002 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6003
6004 T(YAFFS_TRACE_SCAN_DEBUG,
6005 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6006 state, sequenceNumber));
6007
6008
6009 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
6010 dev->blocksInCheckpoint++;
6011
6012 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6013 T(YAFFS_TRACE_BAD_BLOCKS,
6014 (TSTR("block %d is bad" TENDSTR), blk));
6015 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6016 T(YAFFS_TRACE_SCAN_DEBUG,
6017 (TSTR("Block empty " TENDSTR)));
6018 dev->nErasedBlocks++;
6019 dev->nFreeChunks += dev->nChunksPerBlock;
6020 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6021
6022 /* Determine the highest sequence number */
6023 if (dev->isYaffs2 &&
6024 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6025 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6026
6027 blockIndex[nBlocksToScan].seq = sequenceNumber;
6028 blockIndex[nBlocksToScan].block = blk;
6029
6030 nBlocksToScan++;
6031
6032 if (sequenceNumber >= dev->sequenceNumber) {
6033 dev->sequenceNumber = sequenceNumber;
6034 }
6035 } else if (dev->isYaffs2) {
6036 /* TODO: Nasty sequence number! */
6037 T(YAFFS_TRACE_SCAN,
6038 (TSTR
6039 ("Block scanning block %d has bad sequence number %d"
6040 TENDSTR), blk, sequenceNumber));
6041
6042 }
6043 }
6044 }
6045
6046 T(YAFFS_TRACE_SCAN,
6047 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6048
6049
6050
6051 YYIELD();
6052
6053 /* Sort the blocks */
6054 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6055 yaffs_qsort(blockIndex, nBlocksToScan,
6056 sizeof(yaffs_BlockIndex), ybicmp);
6057 #else
6058 {
6059 /* Dungy old bubble sort... */
6060
6061 yaffs_BlockIndex temp;
6062 int i;
6063 int j;
6064
6065 for (i = 0; i < nBlocksToScan; i++)
6066 for (j = i + 1; j < nBlocksToScan; j++)
6067 if (blockIndex[i].seq > blockIndex[j].seq) {
6068 temp = blockIndex[j];
6069 blockIndex[j] = blockIndex[i];
6070 blockIndex[i] = temp;
6071 }
6072 }
6073 #endif
6074
6075 YYIELD();
6076
6077 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6078
6079 /* Now scan the blocks looking at the data. */
6080 startIterator = 0;
6081 endIterator = nBlocksToScan - 1;
6082 T(YAFFS_TRACE_SCAN_DEBUG,
6083 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6084
6085 /* For each block.... backwards */
6086 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6087 blockIterator--) {
6088 /* Cooperative multitasking! This loop can run for so
6089 long that watchdog timers expire. */
6090 YYIELD();
6091
6092 /* get the block to scan in the correct order */
6093 blk = blockIndex[blockIterator].block;
6094
6095 bi = yaffs_GetBlockInfo(dev, blk);
6096
6097
6098 state = bi->blockState;
6099
6100 deleted = 0;
6101
6102 /* For each chunk in each block that needs scanning.... */
6103 foundChunksInBlock = 0;
6104 for (c = dev->nChunksPerBlock - 1;
6105 !alloc_failed && c >= 0 &&
6106 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6107 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6108 /* Scan backwards...
6109 * Read the tags and decide what to do
6110 */
6111
6112 chunk = blk * dev->nChunksPerBlock + c;
6113
6114 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6115 &tags);
6116
6117 /* Let's have a good look at this chunk... */
6118
6119 if (!tags.chunkUsed) {
6120 /* An unassigned chunk in the block.
6121 * If there are used chunks after this one, then
6122 * it is a chunk that was skipped due to failing the erased
6123 * check. Just skip it so that it can be deleted.
6124 * But, more typically, We get here when this is an unallocated
6125 * chunk and his means that either the block is empty or
6126 * this is the one being allocated from
6127 */
6128
6129 if(foundChunksInBlock)
6130 {
6131 /* This is a chunk that was skipped due to failing the erased check */
6132
6133 } else if (c == 0) {
6134 /* We're looking at the first chunk in the block so the block is unused */
6135 state = YAFFS_BLOCK_STATE_EMPTY;
6136 dev->nErasedBlocks++;
6137 } else {
6138 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6139 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6140 if(dev->sequenceNumber == bi->sequenceNumber) {
6141 /* this is the block being allocated from */
6142
6143 T(YAFFS_TRACE_SCAN,
6144 (TSTR
6145 (" Allocating from %d %d"
6146 TENDSTR), blk, c));
6147
6148 state = YAFFS_BLOCK_STATE_ALLOCATING;
6149 dev->allocationBlock = blk;
6150 dev->allocationPage = c;
6151 dev->allocationBlockFinder = blk;
6152 }
6153 else {
6154 /* This is a partially written block that is not
6155 * the current allocation block. This block must have
6156 * had a write failure, so set up for retirement.
6157 */
6158
6159 bi->needsRetiring = 1;
6160 bi->gcPrioritise = 1;
6161
6162 T(YAFFS_TRACE_ALWAYS,
6163 (TSTR("Partially written block %d being set for retirement" TENDSTR),
6164 blk));
6165 }
6166
6167 }
6168
6169 }
6170
6171 dev->nFreeChunks++;
6172
6173 } else if (tags.chunkId > 0) {
6174 /* chunkId > 0 so it is a data chunk... */
6175 unsigned int endpos;
6176 __u32 chunkBase =
6177 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6178
6179 foundChunksInBlock = 1;
6180
6181
6182 yaffs_SetChunkBit(dev, blk, c);
6183 bi->pagesInUse++;
6184
6185 in = yaffs_FindOrCreateObjectByNumber(dev,
6186 tags.
6187 objectId,
6188 YAFFS_OBJECT_TYPE_FILE);
6189 if(!in){
6190 /* Out of memory */
6191 alloc_failed = 1;
6192 }
6193
6194 if (in &&
6195 in->variantType == YAFFS_OBJECT_TYPE_FILE
6196 && chunkBase <
6197 in->variant.fileVariant.shrinkSize) {
6198 /* This has not been invalidated by a resize */
6199 if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
6200 chunk, -1)){
6201 alloc_failed = 1;
6202 }
6203
6204 /* File size is calculated by looking at the data chunks if we have not
6205 * seen an object header yet. Stop this practice once we find an object header.
6206 */
6207 endpos =
6208 (tags.chunkId -
6209 1) * dev->nDataBytesPerChunk +
6210 tags.byteCount;
6211
6212 if (!in->valid && /* have not got an object header yet */
6213 in->variant.fileVariant.
6214 scannedFileSize < endpos) {
6215 in->variant.fileVariant.
6216 scannedFileSize = endpos;
6217 in->variant.fileVariant.
6218 fileSize =
6219 in->variant.fileVariant.
6220 scannedFileSize;
6221 }
6222
6223 } else if(in) {
6224 /* This chunk has been invalidated by a resize, so delete */
6225 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6226
6227 }
6228 } else {
6229 /* chunkId == 0, so it is an ObjectHeader.
6230 * Thus, we read in the object header and make the object
6231 */
6232 foundChunksInBlock = 1;
6233
6234 yaffs_SetChunkBit(dev, blk, c);
6235 bi->pagesInUse++;
6236
6237 oh = NULL;
6238 in = NULL;
6239
6240 if (tags.extraHeaderInfoAvailable) {
6241 in = yaffs_FindOrCreateObjectByNumber
6242 (dev, tags.objectId,
6243 tags.extraObjectType);
6244 }
6245
6246 if (!in ||
6247 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6248 !in->valid ||
6249 #endif
6250 tags.extraShadows ||
6251 (!in->valid &&
6252 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6253 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
6254 ) {
6255
6256 /* If we don't have valid info then we need to read the chunk
6257 * TODO In future we can probably defer reading the chunk and
6258 * living with invalid data until needed.
6259 */
6260
6261 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6262 chunk,
6263 chunkData,
6264 NULL);
6265
6266 oh = (yaffs_ObjectHeader *) chunkData;
6267
6268 if (!in)
6269 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6270
6271 }
6272
6273 if (!in) {
6274 /* TODO Hoosterman we have a problem! */
6275 T(YAFFS_TRACE_ERROR,
6276 (TSTR
6277 ("yaffs tragedy: Could not make object for object %d "
6278 "at chunk %d during scan"
6279 TENDSTR), tags.objectId, chunk));
6280
6281 }
6282
6283 if (in->valid) {
6284 /* We have already filled this one.
6285 * We have a duplicate that will be discarded, but
6286 * we first have to suck out resize info if it is a file.
6287 */
6288
6289 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6290 ((oh &&
6291 oh-> type == YAFFS_OBJECT_TYPE_FILE)||
6292 (tags.extraHeaderInfoAvailable &&
6293 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
6294 ) {
6295 __u32 thisSize =
6296 (oh) ? oh->fileSize : tags.
6297 extraFileLength;
6298 __u32 parentObjectId =
6299 (oh) ? oh->
6300 parentObjectId : tags.
6301 extraParentObjectId;
6302 unsigned isShrink =
6303 (oh) ? oh->isShrink : tags.
6304 extraIsShrinkHeader;
6305
6306 /* If it is deleted (unlinked at start also means deleted)
6307 * we treat the file size as being zeroed at this point.
6308 */
6309 if (parentObjectId ==
6310 YAFFS_OBJECTID_DELETED
6311 || parentObjectId ==
6312 YAFFS_OBJECTID_UNLINKED) {
6313 thisSize = 0;
6314 isShrink = 1;
6315 }
6316
6317 if (isShrink &&
6318 in->variant.fileVariant.
6319 shrinkSize > thisSize) {
6320 in->variant.fileVariant.
6321 shrinkSize =
6322 thisSize;
6323 }
6324
6325 if (isShrink) {
6326 bi->hasShrinkHeader = 1;
6327 }
6328
6329 }
6330 /* Use existing - destroy this one. */
6331 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6332
6333 }
6334
6335 if (!in->valid &&
6336 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6337 tags.objectId ==
6338 YAFFS_OBJECTID_LOSTNFOUND)) {
6339 /* We only load some info, don't fiddle with directory structure */
6340 in->valid = 1;
6341
6342 if(oh) {
6343 in->variantType = oh->type;
6344
6345 in->yst_mode = oh->yst_mode;
6346 #ifdef CONFIG_YAFFS_WINCE
6347 in->win_atime[0] = oh->win_atime[0];
6348 in->win_ctime[0] = oh->win_ctime[0];
6349 in->win_mtime[0] = oh->win_mtime[0];
6350 in->win_atime[1] = oh->win_atime[1];
6351 in->win_ctime[1] = oh->win_ctime[1];
6352 in->win_mtime[1] = oh->win_mtime[1];
6353 #else
6354 in->yst_uid = oh->yst_uid;
6355 in->yst_gid = oh->yst_gid;
6356 in->yst_atime = oh->yst_atime;
6357 in->yst_mtime = oh->yst_mtime;
6358 in->yst_ctime = oh->yst_ctime;
6359 in->yst_rdev = oh->yst_rdev;
6360
6361 #endif
6362 } else {
6363 in->variantType = tags.extraObjectType;
6364 in->lazyLoaded = 1;
6365 }
6366
6367 in->chunkId = chunk;
6368
6369 } else if (!in->valid) {
6370 /* we need to load this info */
6371
6372 in->valid = 1;
6373 in->chunkId = chunk;
6374
6375 if(oh) {
6376 in->variantType = oh->type;
6377
6378 in->yst_mode = oh->yst_mode;
6379 #ifdef CONFIG_YAFFS_WINCE
6380 in->win_atime[0] = oh->win_atime[0];
6381 in->win_ctime[0] = oh->win_ctime[0];
6382 in->win_mtime[0] = oh->win_mtime[0];
6383 in->win_atime[1] = oh->win_atime[1];
6384 in->win_ctime[1] = oh->win_ctime[1];
6385 in->win_mtime[1] = oh->win_mtime[1];
6386 #else
6387 in->yst_uid = oh->yst_uid;
6388 in->yst_gid = oh->yst_gid;
6389 in->yst_atime = oh->yst_atime;
6390 in->yst_mtime = oh->yst_mtime;
6391 in->yst_ctime = oh->yst_ctime;
6392 in->yst_rdev = oh->yst_rdev;
6393 #endif
6394
6395 if (oh->shadowsObject > 0)
6396 yaffs_HandleShadowedObject(dev,
6397 oh->
6398 shadowsObject,
6399 1);
6400
6401
6402 yaffs_SetObjectName(in, oh->name);
6403 parent =
6404 yaffs_FindOrCreateObjectByNumber
6405 (dev, oh->parentObjectId,
6406 YAFFS_OBJECT_TYPE_DIRECTORY);
6407
6408 fileSize = oh->fileSize;
6409 isShrink = oh->isShrink;
6410 equivalentObjectId = oh->equivalentObjectId;
6411
6412 }
6413 else {
6414 in->variantType = tags.extraObjectType;
6415 parent =
6416 yaffs_FindOrCreateObjectByNumber
6417 (dev, tags.extraParentObjectId,
6418 YAFFS_OBJECT_TYPE_DIRECTORY);
6419 fileSize = tags.extraFileLength;
6420 isShrink = tags.extraIsShrinkHeader;
6421 equivalentObjectId = tags.extraEquivalentObjectId;
6422 in->lazyLoaded = 1;
6423
6424 }
6425 in->dirty = 0;
6426
6427 /* directory stuff...
6428 * hook up to parent
6429 */
6430
6431 if (parent->variantType ==
6432 YAFFS_OBJECT_TYPE_UNKNOWN) {
6433 /* Set up as a directory */
6434 parent->variantType =
6435 YAFFS_OBJECT_TYPE_DIRECTORY;
6436 INIT_LIST_HEAD(&parent->variant.
6437 directoryVariant.
6438 children);
6439 } else if (parent->variantType !=
6440 YAFFS_OBJECT_TYPE_DIRECTORY)
6441 {
6442 /* Hoosterman, another problem....
6443 * We're trying to use a non-directory as a directory
6444 */
6445
6446 T(YAFFS_TRACE_ERROR,
6447 (TSTR
6448 ("yaffs tragedy: attempting to use non-directory as"
6449 " a directory in scan. Put in lost+found."
6450 TENDSTR)));
6451 parent = dev->lostNFoundDir;
6452 }
6453
6454 yaffs_AddObjectToDirectory(parent, in);
6455
6456 itsUnlinked = (parent == dev->deletedDir) ||
6457 (parent == dev->unlinkedDir);
6458
6459 if (isShrink) {
6460 /* Mark the block as having a shrinkHeader */
6461 bi->hasShrinkHeader = 1;
6462 }
6463
6464 /* Note re hardlinks.
6465 * Since we might scan a hardlink before its equivalent object is scanned
6466 * we put them all in a list.
6467 * After scanning is complete, we should have all the objects, so we run
6468 * through this list and fix up all the chains.
6469 */
6470
6471 switch (in->variantType) {
6472 case YAFFS_OBJECT_TYPE_UNKNOWN:
6473 /* Todo got a problem */
6474 break;
6475 case YAFFS_OBJECT_TYPE_FILE:
6476
6477 if (in->variant.fileVariant.
6478 scannedFileSize < fileSize) {
6479 /* This covers the case where the file size is greater
6480 * than where the data is
6481 * This will happen if the file is resized to be larger
6482 * than its current data extents.
6483 */
6484 in->variant.fileVariant.fileSize = fileSize;
6485 in->variant.fileVariant.scannedFileSize =
6486 in->variant.fileVariant.fileSize;
6487 }
6488
6489 if (isShrink &&
6490 in->variant.fileVariant.shrinkSize > fileSize) {
6491 in->variant.fileVariant.shrinkSize = fileSize;
6492 }
6493
6494 break;
6495 case YAFFS_OBJECT_TYPE_HARDLINK:
6496 if(!itsUnlinked) {
6497 in->variant.hardLinkVariant.equivalentObjectId =
6498 equivalentObjectId;
6499 in->hardLinks.next =
6500 (struct list_head *) hardList;
6501 hardList = in;
6502 }
6503 break;
6504 case YAFFS_OBJECT_TYPE_DIRECTORY:
6505 /* Do nothing */
6506 break;
6507 case YAFFS_OBJECT_TYPE_SPECIAL:
6508 /* Do nothing */
6509 break;
6510 case YAFFS_OBJECT_TYPE_SYMLINK:
6511 if(oh){
6512 in->variant.symLinkVariant.alias =
6513 yaffs_CloneString(oh->
6514 alias);
6515 if(!in->variant.symLinkVariant.alias)
6516 alloc_failed = 1;
6517 }
6518 break;
6519 }
6520
6521 }
6522
6523 }
6524
6525 } /* End of scanning for each chunk */
6526
6527 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6528 /* If we got this far while scanning, then the block is fully allocated. */
6529 state = YAFFS_BLOCK_STATE_FULL;
6530 }
6531
6532 bi->blockState = state;
6533
6534 /* Now let's see if it was dirty */
6535 if (bi->pagesInUse == 0 &&
6536 !bi->hasShrinkHeader &&
6537 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6538 yaffs_BlockBecameDirty(dev, blk);
6539 }
6540
6541 }
6542
6543 if (altBlockIndex)
6544 YFREE_ALT(blockIndex);
6545 else
6546 YFREE(blockIndex);
6547
6548 /* Ok, we've done all the scanning.
6549 * Fix up the hard link chains.
6550 * We should now have scanned all the objects, now it's time to add these
6551 * hardlinks.
6552 */
6553 yaffs_HardlinkFixup(dev,hardList);
6554
6555
6556 /*
6557 * Sort out state of unlinked and deleted objects.
6558 */
6559 {
6560 struct list_head *i;
6561 struct list_head *n;
6562
6563 yaffs_Object *l;
6564
6565 /* Soft delete all the unlinked files */
6566 list_for_each_safe(i, n,
6567 &dev->unlinkedDir->variant.directoryVariant.
6568 children) {
6569 if (i) {
6570 l = list_entry(i, yaffs_Object, siblings);
6571 yaffs_DestroyObject(l);
6572 }
6573 }
6574
6575 /* Soft delete all the deletedDir files */
6576 list_for_each_safe(i, n,
6577 &dev->deletedDir->variant.directoryVariant.
6578 children) {
6579 if (i) {
6580 l = list_entry(i, yaffs_Object, siblings);
6581 yaffs_DestroyObject(l);
6582
6583 }
6584 }
6585 }
6586
6587 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6588
6589 if(alloc_failed){
6590 return YAFFS_FAIL;
6591 }
6592
6593 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6594
6595 return YAFFS_OK;
6596 }
6597
6598 /*------------------------------ Directory Functions ----------------------------- */
6599
6600 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
6601 {
6602 yaffs_Device *dev = obj->myDev;
6603
6604 if(dev && dev->removeObjectCallback)
6605 dev->removeObjectCallback(obj);
6606
6607 list_del_init(&obj->siblings);
6608 obj->parent = NULL;
6609 }
6610
6611
6612 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
6613 yaffs_Object * obj)
6614 {
6615
6616 if (!directory) {
6617 T(YAFFS_TRACE_ALWAYS,
6618 (TSTR
6619 ("tragedy: Trying to add an object to a null pointer directory"
6620 TENDSTR)));
6621 YBUG();
6622 }
6623 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6624 T(YAFFS_TRACE_ALWAYS,
6625 (TSTR
6626 ("tragedy: Trying to add an object to a non-directory"
6627 TENDSTR)));
6628 YBUG();
6629 }
6630
6631 if (obj->siblings.prev == NULL) {
6632 /* Not initialised */
6633 INIT_LIST_HEAD(&obj->siblings);
6634
6635 } else if (!list_empty(&obj->siblings)) {
6636 /* If it is holed up somewhere else, un hook it */
6637 yaffs_RemoveObjectFromDirectory(obj);
6638 }
6639 /* Now add it */
6640 list_add(&obj->siblings, &directory->variant.directoryVariant.children);
6641 obj->parent = directory;
6642
6643 if (directory == obj->myDev->unlinkedDir
6644 || directory == obj->myDev->deletedDir) {
6645 obj->unlinked = 1;
6646 obj->myDev->nUnlinkedFiles++;
6647 obj->renameAllowed = 0;
6648 }
6649 }
6650
6651 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
6652 const YCHAR * name)
6653 {
6654 int sum;
6655
6656 struct list_head *i;
6657 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6658
6659 yaffs_Object *l;
6660
6661 if (!name) {
6662 return NULL;
6663 }
6664
6665 if (!directory) {
6666 T(YAFFS_TRACE_ALWAYS,
6667 (TSTR
6668 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6669 TENDSTR)));
6670 YBUG();
6671 }
6672 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6673 T(YAFFS_TRACE_ALWAYS,
6674 (TSTR
6675 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6676 YBUG();
6677 }
6678
6679 sum = yaffs_CalcNameSum(name);
6680
6681 list_for_each(i, &directory->variant.directoryVariant.children) {
6682 if (i) {
6683 l = list_entry(i, yaffs_Object, siblings);
6684
6685 yaffs_CheckObjectDetailsLoaded(l);
6686
6687 /* Special case for lost-n-found */
6688 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6689 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
6690 return l;
6691 }
6692 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
6693 {
6694 /* LostnFound cunk called Objxxx
6695 * Do a real check
6696 */
6697 yaffs_GetObjectName(l, buffer,
6698 YAFFS_MAX_NAME_LENGTH);
6699 if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
6700 return l;
6701 }
6702
6703 }
6704 }
6705 }
6706
6707 return NULL;
6708 }
6709
6710
6711 #if 0
6712 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
6713 int (*fn) (yaffs_Object *))
6714 {
6715 struct list_head *i;
6716 yaffs_Object *l;
6717
6718 if (!theDir) {
6719 T(YAFFS_TRACE_ALWAYS,
6720 (TSTR
6721 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6722 TENDSTR)));
6723 YBUG();
6724 }
6725 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6726 T(YAFFS_TRACE_ALWAYS,
6727 (TSTR
6728 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6729 YBUG();
6730 }
6731
6732 list_for_each(i, &theDir->variant.directoryVariant.children) {
6733 if (i) {
6734 l = list_entry(i, yaffs_Object, siblings);
6735 if (l && !fn(l)) {
6736 return YAFFS_FAIL;
6737 }
6738 }
6739 }
6740
6741 return YAFFS_OK;
6742
6743 }
6744 #endif
6745
6746 /* GetEquivalentObject dereferences any hard links to get to the
6747 * actual object.
6748 */
6749
6750 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
6751 {
6752 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6753 /* We want the object id of the equivalent object, not this one */
6754 obj = obj->variant.hardLinkVariant.equivalentObject;
6755 yaffs_CheckObjectDetailsLoaded(obj);
6756 }
6757 return obj;
6758
6759 }
6760
6761 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
6762 {
6763 memset(name, 0, buffSize * sizeof(YCHAR));
6764
6765 yaffs_CheckObjectDetailsLoaded(obj);
6766
6767 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6768 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6769 } else if (obj->chunkId <= 0) {
6770 YCHAR locName[20];
6771 /* make up a name */
6772 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
6773 obj->objectId);
6774 yaffs_strncpy(name, locName, buffSize - 1);
6775
6776 }
6777 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6778 else if (obj->shortName[0]) {
6779 yaffs_strcpy(name, obj->shortName);
6780 }
6781 #endif
6782 else {
6783 int result;
6784 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6785
6786 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6787
6788 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6789
6790 if (obj->chunkId >= 0) {
6791 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6792 obj->chunkId, buffer,
6793 NULL);
6794 }
6795 yaffs_strncpy(name, oh->name, buffSize - 1);
6796
6797 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6798 }
6799
6800 return yaffs_strlen(name);
6801 }
6802
6803 int yaffs_GetObjectFileLength(yaffs_Object * obj)
6804 {
6805
6806 /* Dereference any hard linking */
6807 obj = yaffs_GetEquivalentObject(obj);
6808
6809 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
6810 return obj->variant.fileVariant.fileSize;
6811 }
6812 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6813 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6814 } else {
6815 /* Only a directory should drop through to here */
6816 return obj->myDev->nDataBytesPerChunk;
6817 }
6818 }
6819
6820 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
6821 {
6822 int count = 0;
6823 struct list_head *i;
6824
6825 if (!obj->unlinked) {
6826 count++; /* the object itself */
6827 }
6828 list_for_each(i, &obj->hardLinks) {
6829 count++; /* add the hard links; */
6830 }
6831 return count;
6832
6833 }
6834
6835 int yaffs_GetObjectInode(yaffs_Object * obj)
6836 {
6837 obj = yaffs_GetEquivalentObject(obj);
6838
6839 return obj->objectId;
6840 }
6841
6842 unsigned yaffs_GetObjectType(yaffs_Object * obj)
6843 {
6844 obj = yaffs_GetEquivalentObject(obj);
6845
6846 switch (obj->variantType) {
6847 case YAFFS_OBJECT_TYPE_FILE:
6848 return DT_REG;
6849 break;
6850 case YAFFS_OBJECT_TYPE_DIRECTORY:
6851 return DT_DIR;
6852 break;
6853 case YAFFS_OBJECT_TYPE_SYMLINK:
6854 return DT_LNK;
6855 break;
6856 case YAFFS_OBJECT_TYPE_HARDLINK:
6857 return DT_REG;
6858 break;
6859 case YAFFS_OBJECT_TYPE_SPECIAL:
6860 if (S_ISFIFO(obj->yst_mode))
6861 return DT_FIFO;
6862 if (S_ISCHR(obj->yst_mode))
6863 return DT_CHR;
6864 if (S_ISBLK(obj->yst_mode))
6865 return DT_BLK;
6866 if (S_ISSOCK(obj->yst_mode))
6867 return DT_SOCK;
6868 default:
6869 return DT_REG;
6870 break;
6871 }
6872 }
6873
6874 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
6875 {
6876 obj = yaffs_GetEquivalentObject(obj);
6877 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6878 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
6879 } else {
6880 return yaffs_CloneString(_Y(""));
6881 }
6882 }
6883
6884 #ifndef CONFIG_YAFFS_WINCE
6885
6886 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
6887 {
6888 unsigned int valid = attr->ia_valid;
6889
6890 if (valid & ATTR_MODE)
6891 obj->yst_mode = attr->ia_mode;
6892 if (valid & ATTR_UID)
6893 obj->yst_uid = attr->ia_uid;
6894 if (valid & ATTR_GID)
6895 obj->yst_gid = attr->ia_gid;
6896
6897 if (valid & ATTR_ATIME)
6898 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
6899 if (valid & ATTR_CTIME)
6900 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
6901 if (valid & ATTR_MTIME)
6902 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
6903
6904 if (valid & ATTR_SIZE)
6905 yaffs_ResizeFile(obj, attr->ia_size);
6906
6907 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6908
6909 return YAFFS_OK;
6910
6911 }
6912 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
6913 {
6914 unsigned int valid = 0;
6915
6916 attr->ia_mode = obj->yst_mode;
6917 valid |= ATTR_MODE;
6918 attr->ia_uid = obj->yst_uid;
6919 valid |= ATTR_UID;
6920 attr->ia_gid = obj->yst_gid;
6921 valid |= ATTR_GID;
6922
6923 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
6924 valid |= ATTR_ATIME;
6925 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
6926 valid |= ATTR_CTIME;
6927 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
6928 valid |= ATTR_MTIME;
6929
6930 attr->ia_size = yaffs_GetFileSize(obj);
6931 valid |= ATTR_SIZE;
6932
6933 attr->ia_valid = valid;
6934
6935 return YAFFS_OK;
6936
6937 }
6938
6939 #endif
6940
6941 #if 0
6942 int yaffs_DumpObject(yaffs_Object * obj)
6943 {
6944 YCHAR name[257];
6945
6946 yaffs_GetObjectName(obj, name, 256);
6947
6948 T(YAFFS_TRACE_ALWAYS,
6949 (TSTR
6950 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
6951 " chunk %d type %d size %d\n"
6952 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
6953 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
6954 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
6955
6956 return YAFFS_OK;
6957 }
6958 #endif
6959
6960 /*---------------------------- Initialisation code -------------------------------------- */
6961
6962 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
6963 {
6964
6965 /* Common functions, gotta have */
6966 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
6967 return 0;
6968
6969 #ifdef CONFIG_YAFFS_YAFFS2
6970
6971 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
6972 if (dev->writeChunkWithTagsToNAND &&
6973 dev->readChunkWithTagsFromNAND &&
6974 !dev->writeChunkToNAND &&
6975 !dev->readChunkFromNAND &&
6976 dev->markNANDBlockBad && dev->queryNANDBlock)
6977 return 1;
6978 #endif
6979
6980 /* Can use the "spare" style interface for yaffs1 */
6981 if (!dev->isYaffs2 &&
6982 !dev->writeChunkWithTagsToNAND &&
6983 !dev->readChunkWithTagsFromNAND &&
6984 dev->writeChunkToNAND &&
6985 dev->readChunkFromNAND &&
6986 !dev->markNANDBlockBad && !dev->queryNANDBlock)
6987 return 1;
6988
6989 return 0; /* bad */
6990 }
6991
6992
6993 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
6994 {
6995 /* Initialise the unlinked, deleted, root and lost and found directories */
6996
6997 dev->lostNFoundDir = dev->rootDir = NULL;
6998 dev->unlinkedDir = dev->deletedDir = NULL;
6999
7000 dev->unlinkedDir =
7001 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7002
7003 dev->deletedDir =
7004 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7005
7006 dev->rootDir =
7007 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7008 YAFFS_ROOT_MODE | S_IFDIR);
7009 dev->lostNFoundDir =
7010 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7011 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7012
7013 if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
7014 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7015 return YAFFS_OK;
7016 }
7017
7018 return YAFFS_FAIL;
7019 }
7020
7021 int yaffs_GutsInitialise(yaffs_Device * dev)
7022 {
7023 int init_failed = 0;
7024 unsigned x;
7025 int bits;
7026
7027 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7028
7029 /* Check stuff that must be set */
7030
7031 if (!dev) {
7032 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7033 return YAFFS_FAIL;
7034 }
7035
7036 dev->internalStartBlock = dev->startBlock;
7037 dev->internalEndBlock = dev->endBlock;
7038 dev->blockOffset = 0;
7039 dev->chunkOffset = 0;
7040 dev->nFreeChunks = 0;
7041
7042 if (dev->startBlock == 0) {
7043 dev->internalStartBlock = dev->startBlock + 1;
7044 dev->internalEndBlock = dev->endBlock + 1;
7045 dev->blockOffset = 1;
7046 dev->chunkOffset = dev->nChunksPerBlock;
7047 }
7048
7049 /* Check geometry parameters. */
7050
7051 if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
7052 (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
7053 dev->nChunksPerBlock < 2 ||
7054 dev->nReservedBlocks < 2 ||
7055 dev->internalStartBlock <= 0 ||
7056 dev->internalEndBlock <= 0 ||
7057 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
7058 ) {
7059 T(YAFFS_TRACE_ALWAYS,
7060 (TSTR
7061 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
7062 TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
7063 return YAFFS_FAIL;
7064 }
7065
7066 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7067 T(YAFFS_TRACE_ALWAYS,
7068 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7069 return YAFFS_FAIL;
7070 }
7071
7072 /* Got the right mix of functions? */
7073 if (!yaffs_CheckDevFunctions(dev)) {
7074 /* Function missing */
7075 T(YAFFS_TRACE_ALWAYS,
7076 (TSTR
7077 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7078
7079 return YAFFS_FAIL;
7080 }
7081
7082 /* This is really a compilation check. */
7083 if (!yaffs_CheckStructures()) {
7084 T(YAFFS_TRACE_ALWAYS,
7085 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7086 return YAFFS_FAIL;
7087 }
7088
7089 if (dev->isMounted) {
7090 T(YAFFS_TRACE_ALWAYS,
7091 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7092 return YAFFS_FAIL;
7093 }
7094
7095 /* Finished with most checks. One or two more checks happen later on too. */
7096
7097 dev->isMounted = 1;
7098
7099
7100
7101 /* OK now calculate a few things for the device */
7102
7103 /*
7104 * Calculate all the chunk size manipulation numbers:
7105 */
7106 /* Start off assuming it is a power of 2 */
7107 dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
7108 dev->chunkMask = (1<<dev->chunkShift) - 1;
7109
7110 if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
7111 /* Yes it is a power of 2, disable crumbs */
7112 dev->crumbMask = 0;
7113 dev->crumbShift = 0;
7114 dev->crumbsPerChunk = 0;
7115 } else {
7116 /* Not a power of 2, use crumbs instead */
7117 dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
7118 dev->crumbMask = (1<<dev->crumbShift)-1;
7119 dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
7120 dev->chunkShift = 0;
7121 dev->chunkMask = 0;
7122 }
7123
7124
7125 /*
7126 * Calculate chunkGroupBits.
7127 * We need to find the next power of 2 > than internalEndBlock
7128 */
7129
7130 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7131
7132 bits = ShiftsGE(x);
7133
7134 /* Set up tnode width if wide tnodes are enabled. */
7135 if(!dev->wideTnodesDisabled){
7136 /* bits must be even so that we end up with 32-bit words */
7137 if(bits & 1)
7138 bits++;
7139 if(bits < 16)
7140 dev->tnodeWidth = 16;
7141 else
7142 dev->tnodeWidth = bits;
7143 }
7144 else
7145 dev->tnodeWidth = 16;
7146
7147 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7148
7149 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7150 * so if the bitwidth of the
7151 * chunk range we're using is greater than 16 we need
7152 * to figure out chunk shift and chunkGroupSize
7153 */
7154
7155 if (bits <= dev->tnodeWidth)
7156 dev->chunkGroupBits = 0;
7157 else
7158 dev->chunkGroupBits = bits - dev->tnodeWidth;
7159
7160
7161 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7162
7163 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7164 /* We have a problem because the soft delete won't work if
7165 * the chunk group size > chunks per block.
7166 * This can be remedied by using larger "virtual blocks".
7167 */
7168 T(YAFFS_TRACE_ALWAYS,
7169 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7170
7171 return YAFFS_FAIL;
7172 }
7173
7174 /* OK, we've finished verifying the device, lets continue with initialisation */
7175
7176 /* More device initialisation */
7177 dev->garbageCollections = 0;
7178 dev->passiveGarbageCollections = 0;
7179 dev->currentDirtyChecker = 0;
7180 dev->bufferedBlock = -1;
7181 dev->doingBufferedBlockRewrite = 0;
7182 dev->nDeletedFiles = 0;
7183 dev->nBackgroundDeletions = 0;
7184 dev->nUnlinkedFiles = 0;
7185 dev->eccFixed = 0;
7186 dev->eccUnfixed = 0;
7187 dev->tagsEccFixed = 0;
7188 dev->tagsEccUnfixed = 0;
7189 dev->nErasureFailures = 0;
7190 dev->nErasedBlocks = 0;
7191 dev->isDoingGC = 0;
7192 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7193
7194 /* Initialise temporary buffers and caches. */
7195 if(!yaffs_InitialiseTempBuffers(dev))
7196 init_failed = 1;
7197
7198 dev->srCache = NULL;
7199 dev->gcCleanupList = NULL;
7200
7201
7202 if (!init_failed &&
7203 dev->nShortOpCaches > 0) {
7204 int i;
7205 __u8 *buf;
7206 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7207
7208 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
7209 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7210 }
7211
7212 buf = dev->srCache = YMALLOC(srCacheBytes);
7213
7214 if(dev->srCache)
7215 memset(dev->srCache,0,srCacheBytes);
7216
7217 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7218 dev->srCache[i].object = NULL;
7219 dev->srCache[i].lastUse = 0;
7220 dev->srCache[i].dirty = 0;
7221 dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
7222 }
7223 if(!buf)
7224 init_failed = 1;
7225
7226 dev->srLastUse = 0;
7227 }
7228
7229 dev->cacheHits = 0;
7230
7231 if(!init_failed){
7232 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7233 if(!dev->gcCleanupList)
7234 init_failed = 1;
7235 }
7236
7237 if (dev->isYaffs2) {
7238 dev->useHeaderFileSize = 1;
7239 }
7240 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7241 init_failed = 1;
7242
7243 yaffs_InitialiseTnodes(dev);
7244 yaffs_InitialiseObjects(dev);
7245
7246 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7247 init_failed = 1;
7248
7249
7250 if(!init_failed){
7251 /* Now scan the flash. */
7252 if (dev->isYaffs2) {
7253 if(yaffs_CheckpointRestore(dev)) {
7254 T(YAFFS_TRACE_ALWAYS,
7255 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7256 } else {
7257
7258 /* Clean up the mess caused by an aborted checkpoint load
7259 * and scan backwards.
7260 */
7261 yaffs_DeinitialiseBlocks(dev);
7262 yaffs_DeinitialiseTnodes(dev);
7263 yaffs_DeinitialiseObjects(dev);
7264
7265
7266 dev->nErasedBlocks = 0;
7267 dev->nFreeChunks = 0;
7268 dev->allocationBlock = -1;
7269 dev->allocationPage = -1;
7270 dev->nDeletedFiles = 0;
7271 dev->nUnlinkedFiles = 0;
7272 dev->nBackgroundDeletions = 0;
7273 dev->oldestDirtySequence = 0;
7274
7275 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7276 init_failed = 1;
7277
7278 yaffs_InitialiseTnodes(dev);
7279 yaffs_InitialiseObjects(dev);
7280
7281 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7282 init_failed = 1;
7283
7284 if(!init_failed && !yaffs_ScanBackwards(dev))
7285 init_failed = 1;
7286 }
7287 }else
7288 if(!yaffs_Scan(dev))
7289 init_failed = 1;
7290 }
7291
7292 if(init_failed){
7293 /* Clean up the mess */
7294 T(YAFFS_TRACE_TRACING,
7295 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7296
7297 yaffs_Deinitialise(dev);
7298 return YAFFS_FAIL;
7299 }
7300
7301 /* Zero out stats */
7302 dev->nPageReads = 0;
7303 dev->nPageWrites = 0;
7304 dev->nBlockErasures = 0;
7305 dev->nGCCopies = 0;
7306 dev->nRetriedWrites = 0;
7307
7308 dev->nRetiredBlocks = 0;
7309
7310 yaffs_VerifyFreeChunks(dev);
7311 yaffs_VerifyBlocks(dev);
7312
7313
7314 T(YAFFS_TRACE_TRACING,
7315 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7316 return YAFFS_OK;
7317
7318 }
7319
7320 void yaffs_Deinitialise(yaffs_Device * dev)
7321 {
7322 if (dev->isMounted) {
7323 int i;
7324
7325 yaffs_DeinitialiseBlocks(dev);
7326 yaffs_DeinitialiseTnodes(dev);
7327 yaffs_DeinitialiseObjects(dev);
7328 if (dev->nShortOpCaches > 0 &&
7329 dev->srCache) {
7330
7331 for (i = 0; i < dev->nShortOpCaches; i++) {
7332 if(dev->srCache[i].data)
7333 YFREE(dev->srCache[i].data);
7334 dev->srCache[i].data = NULL;
7335 }
7336
7337 YFREE(dev->srCache);
7338 dev->srCache = NULL;
7339 }
7340
7341 YFREE(dev->gcCleanupList);
7342
7343 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
7344 YFREE(dev->tempBuffer[i].buffer);
7345 }
7346
7347 dev->isMounted = 0;
7348 }
7349
7350 }
7351
7352 static int yaffs_CountFreeChunks(yaffs_Device * dev)
7353 {
7354 int nFree;
7355 int b;
7356
7357 yaffs_BlockInfo *blk;
7358
7359 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7360 b++) {
7361 blk = yaffs_GetBlockInfo(dev, b);
7362
7363 switch (blk->blockState) {
7364 case YAFFS_BLOCK_STATE_EMPTY:
7365 case YAFFS_BLOCK_STATE_ALLOCATING:
7366 case YAFFS_BLOCK_STATE_COLLECTING:
7367 case YAFFS_BLOCK_STATE_FULL:
7368 nFree +=
7369 (dev->nChunksPerBlock - blk->pagesInUse +
7370 blk->softDeletions);
7371 break;
7372 default:
7373 break;
7374 }
7375
7376 }
7377
7378 return nFree;
7379 }
7380
7381 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
7382 {
7383 /* This is what we report to the outside world */
7384
7385 int nFree;
7386 int nDirtyCacheChunks;
7387 int blocksForCheckpoint;
7388
7389 #if 1
7390 nFree = dev->nFreeChunks;
7391 #else
7392 nFree = yaffs_CountFreeChunks(dev);
7393 #endif
7394
7395 nFree += dev->nDeletedFiles;
7396
7397 /* Now count the number of dirty chunks in the cache and subtract those */
7398
7399 {
7400 int i;
7401 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7402 if (dev->srCache[i].dirty)
7403 nDirtyCacheChunks++;
7404 }
7405 }
7406
7407 nFree -= nDirtyCacheChunks;
7408
7409 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7410
7411 /* Now we figure out how much to reserve for the checkpoint and report that... */
7412 blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
7413 if(blocksForCheckpoint < 0)
7414 blocksForCheckpoint = 0;
7415
7416 nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7417
7418 if (nFree < 0)
7419 nFree = 0;
7420
7421 return nFree;
7422
7423 }
7424
7425 static int yaffs_freeVerificationFailures;
7426
7427 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
7428 {
7429 int counted;
7430 int difference;
7431
7432 if(yaffs_SkipVerification(dev))
7433 return;
7434
7435 counted = yaffs_CountFreeChunks(dev);
7436
7437 difference = dev->nFreeChunks - counted;
7438
7439 if (difference) {
7440 T(YAFFS_TRACE_ALWAYS,
7441 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7442 dev->nFreeChunks, counted, difference));
7443 yaffs_freeVerificationFailures++;
7444 }
7445 }
7446
7447 /*---------------------------------------- YAFFS test code ----------------------*/
7448
7449 #define yaffs_CheckStruct(structure,syze, name) \
7450 if(sizeof(structure) != syze) \
7451 { \
7452 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
7453 name,syze,sizeof(structure))); \
7454 return YAFFS_FAIL; \
7455 }
7456
7457 static int yaffs_CheckStructures(void)
7458 {
7459 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
7460 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
7461 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
7462 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7463 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
7464 #endif
7465 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
7466
7467 return YAFFS_OK;
7468 }
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