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generic: allow to build myloader mtd parser for 3.2+
[openwrt.git] / target / linux / generic / 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 "$Id: yaffs_guts.c,v 1.49 2007-05-15 20:07:40 charles Exp $";
16
17 #include "yportenv.h"
18
19 #include "yaffsinterface.h"
20 #include "yaffs_guts.h"
21 #include "yaffs_tagsvalidity.h"
22
23 #include "yaffs_tagscompat.h"
24 #ifndef CONFIG_YAFFS_USE_OWN_SORT
25 #include "yaffs_qsort.h"
26 #endif
27 #include "yaffs_nand.h"
28
29 #include "yaffs_checkptrw.h"
30
31 #include "yaffs_nand.h"
32 #include "yaffs_packedtags2.h"
33
34
35 #ifdef CONFIG_YAFFS_WINCE
36 void yfsd_LockYAFFS(BOOL fsLockOnly);
37 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
38 #endif
39
40 #define YAFFS_PASSIVE_GC_CHUNKS 2
41
42 #include "yaffs_ecc.h"
43
44
45 /* Robustification (if it ever comes about...) */
46 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
47 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
48 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
49 const __u8 * data,
50 const yaffs_ExtendedTags * tags);
51 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
52 const yaffs_ExtendedTags * tags);
53
54 /* Other local prototypes */
55 static int yaffs_UnlinkObject( yaffs_Object *obj);
56 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
57
58 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
59
60 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
61 const __u8 * buffer,
62 yaffs_ExtendedTags * tags,
63 int useReserve);
64 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
65 int chunkInNAND, int inScan);
66
67 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
68 yaffs_ObjectType type);
69 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
70 yaffs_Object * obj);
71 static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
72 int force, int isShrink, int shadows);
73 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
74 static int yaffs_CheckStructures(void);
75 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
76 int chunkOffset, int *limit);
77 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
78
79 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
80
81 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
82 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
83 int lineNo);
84
85 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
86 int chunkInNAND);
87
88 static int yaffs_UnlinkWorker(yaffs_Object * obj);
89 static void yaffs_DestroyObject(yaffs_Object * obj);
90
91 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
92 int chunkInObject);
93
94 loff_t yaffs_GetFileSize(yaffs_Object * obj);
95
96 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
97
98 static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
99
100 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
101
102 #ifdef YAFFS_PARANOID
103 static int yaffs_CheckFileSanity(yaffs_Object * in);
104 #else
105 #define yaffs_CheckFileSanity(in)
106 #endif
107
108 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
109 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
110
111 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
112
113 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
114 yaffs_ExtendedTags * tags);
115
116 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
117 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
118 yaffs_FileStructure * fStruct,
119 __u32 chunkId);
120
121
122 /* Function to calculate chunk and offset */
123
124 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
125 {
126 if(dev->chunkShift){
127 /* Easy-peasy power of 2 case */
128 *chunk = (__u32)(addr >> dev->chunkShift);
129 *offset = (__u32)(addr & dev->chunkMask);
130 }
131 else if(dev->crumbsPerChunk)
132 {
133 /* Case where we're using "crumbs" */
134 *offset = (__u32)(addr & dev->crumbMask);
135 addr >>= dev->crumbShift;
136 *chunk = ((__u32)addr)/dev->crumbsPerChunk;
137 *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
138 }
139 else
140 YBUG();
141 }
142
143 /* Function to return the number of shifts for a power of 2 greater than or equal
144 * to the given number
145 * Note we don't try to cater for all possible numbers and this does not have to
146 * be hellishly efficient.
147 */
148
149 static __u32 ShiftsGE(__u32 x)
150 {
151 int extraBits;
152 int nShifts;
153
154 nShifts = extraBits = 0;
155
156 while(x>1){
157 if(x & 1) extraBits++;
158 x>>=1;
159 nShifts++;
160 }
161
162 if(extraBits)
163 nShifts++;
164
165 return nShifts;
166 }
167
168 /* Function to return the number of shifts to get a 1 in bit 0
169 */
170
171 static __u32 ShiftDiv(__u32 x)
172 {
173 int nShifts;
174
175 nShifts = 0;
176
177 if(!x) return 0;
178
179 while( !(x&1)){
180 x>>=1;
181 nShifts++;
182 }
183
184 return nShifts;
185 }
186
187
188
189 /*
190 * Temporary buffer manipulations.
191 */
192
193 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
194 {
195 int i;
196 __u8 *buf = (__u8 *)1;
197
198 memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
199
200 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
201 dev->tempBuffer[i].line = 0; /* not in use */
202 dev->tempBuffer[i].buffer = buf =
203 YMALLOC_DMA(dev->nDataBytesPerChunk);
204 }
205
206 return buf ? YAFFS_OK : YAFFS_FAIL;
207
208 }
209
210 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
211 {
212 int i, j;
213 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
214 if (dev->tempBuffer[i].line == 0) {
215 dev->tempBuffer[i].line = lineNo;
216 if ((i + 1) > dev->maxTemp) {
217 dev->maxTemp = i + 1;
218 for (j = 0; j <= i; j++)
219 dev->tempBuffer[j].maxLine =
220 dev->tempBuffer[j].line;
221 }
222
223 return dev->tempBuffer[i].buffer;
224 }
225 }
226
227 T(YAFFS_TRACE_BUFFERS,
228 (TSTR("Out of temp buffers at line %d, other held by lines:"),
229 lineNo));
230 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
231 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
232 }
233 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
234
235 /*
236 * If we got here then we have to allocate an unmanaged one
237 * This is not good.
238 */
239
240 dev->unmanagedTempAllocations++;
241 return YMALLOC(dev->nDataBytesPerChunk);
242
243 }
244
245 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
246 int lineNo)
247 {
248 int i;
249 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
250 if (dev->tempBuffer[i].buffer == buffer) {
251 dev->tempBuffer[i].line = 0;
252 return;
253 }
254 }
255
256 if (buffer) {
257 /* assume it is an unmanaged one. */
258 T(YAFFS_TRACE_BUFFERS,
259 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
260 lineNo));
261 YFREE(buffer);
262 dev->unmanagedTempDeallocations++;
263 }
264
265 }
266
267 /*
268 * Determine if we have a managed buffer.
269 */
270 int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
271 {
272 int i;
273 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
274 if (dev->tempBuffer[i].buffer == buffer)
275 return 1;
276
277 }
278
279 for (i = 0; i < dev->nShortOpCaches; i++) {
280 if( dev->srCache[i].data == buffer )
281 return 1;
282
283 }
284
285 if (buffer == dev->checkpointBuffer)
286 return 1;
287
288 T(YAFFS_TRACE_ALWAYS,
289 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
290 return 0;
291 }
292
293
294
295 /*
296 * Chunk bitmap manipulations
297 */
298
299 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
300 {
301 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
302 T(YAFFS_TRACE_ERROR,
303 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
304 blk));
305 YBUG();
306 }
307 return dev->chunkBits +
308 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
309 }
310
311 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
312 {
313 if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
314 chunk < 0 || chunk >= dev->nChunksPerBlock) {
315 T(YAFFS_TRACE_ERROR,
316 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
317 YBUG();
318 }
319 }
320
321 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
322 {
323 __u8 *blkBits = yaffs_BlockBits(dev, blk);
324
325 memset(blkBits, 0, dev->chunkBitmapStride);
326 }
327
328 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
329 {
330 __u8 *blkBits = yaffs_BlockBits(dev, blk);
331
332 yaffs_VerifyChunkBitId(dev,blk,chunk);
333
334 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
335 }
336
337 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
338 {
339 __u8 *blkBits = yaffs_BlockBits(dev, blk);
340
341 yaffs_VerifyChunkBitId(dev,blk,chunk);
342
343 blkBits[chunk / 8] |= (1 << (chunk & 7));
344 }
345
346 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
347 {
348 __u8 *blkBits = yaffs_BlockBits(dev, blk);
349 yaffs_VerifyChunkBitId(dev,blk,chunk);
350
351 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
352 }
353
354 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
355 {
356 __u8 *blkBits = yaffs_BlockBits(dev, blk);
357 int i;
358 for (i = 0; i < dev->chunkBitmapStride; i++) {
359 if (*blkBits)
360 return 1;
361 blkBits++;
362 }
363 return 0;
364 }
365
366 static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
367 {
368 __u8 *blkBits = yaffs_BlockBits(dev, blk);
369 int i;
370 int n = 0;
371 for (i = 0; i < dev->chunkBitmapStride; i++) {
372 __u8 x = *blkBits;
373 while(x){
374 if(x & 1)
375 n++;
376 x >>=1;
377 }
378
379 blkBits++;
380 }
381 return n;
382 }
383
384 /*
385 * Verification code
386 */
387
388 static int yaffs_SkipVerification(yaffs_Device *dev)
389 {
390 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
391 }
392
393 static int yaffs_SkipFullVerification(yaffs_Device *dev)
394 {
395 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
396 }
397
398 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
399 {
400 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
401 }
402
403 static const char * blockStateName[] = {
404 "Unknown",
405 "Needs scanning",
406 "Scanning",
407 "Empty",
408 "Allocating",
409 "Full",
410 "Dirty",
411 "Checkpoint",
412 "Collecting",
413 "Dead"
414 };
415
416 static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
417 {
418 int actuallyUsed;
419 int inUse;
420
421 if(yaffs_SkipVerification(dev))
422 return;
423
424 /* Report illegal runtime states */
425 if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
426 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
427
428 switch(bi->blockState){
429 case YAFFS_BLOCK_STATE_UNKNOWN:
430 case YAFFS_BLOCK_STATE_SCANNING:
431 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
432 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
433 n,blockStateName[bi->blockState]));
434 }
435
436 /* Check pages in use and soft deletions are legal */
437
438 actuallyUsed = bi->pagesInUse - bi->softDeletions;
439
440 if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
441 bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
442 actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
443 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
444 n,bi->pagesInUse,bi->softDeletions));
445
446
447 /* Check chunk bitmap legal */
448 inUse = yaffs_CountChunkBits(dev,n);
449 if(inUse != bi->pagesInUse)
450 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
451 n,bi->pagesInUse,inUse));
452
453 /* Check that the sequence number is valid.
454 * Ten million is legal, but is very unlikely
455 */
456 if(dev->isYaffs2 &&
457 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
458 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
459 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
460 n,bi->sequenceNumber));
461
462 }
463
464 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
465 {
466 yaffs_VerifyBlock(dev,bi,n);
467
468 /* After collection the block should be in the erased state */
469 /* TODO: This will need to change if we do partial gc */
470
471 if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
472 T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
473 n,bi->blockState));
474 }
475 }
476
477 static void yaffs_VerifyBlocks(yaffs_Device *dev)
478 {
479 int i;
480 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
481 int nIllegalBlockStates = 0;
482
483
484 if(yaffs_SkipVerification(dev))
485 return;
486
487 memset(nBlocksPerState,0,sizeof(nBlocksPerState));
488
489
490 for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
491 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
492 yaffs_VerifyBlock(dev,bi,i);
493
494 if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
495 nBlocksPerState[bi->blockState]++;
496 else
497 nIllegalBlockStates++;
498
499 }
500
501 T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
502 T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
503
504 T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
505 if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
506 T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
507
508 for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
509 T(YAFFS_TRACE_VERIFY,
510 (TSTR("%s %d blocks"TENDSTR),
511 blockStateName[i],nBlocksPerState[i]));
512
513 if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
514 T(YAFFS_TRACE_VERIFY,
515 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
516 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
517
518 if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
519 T(YAFFS_TRACE_VERIFY,
520 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
521 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
522
523 if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
524 T(YAFFS_TRACE_VERIFY,
525 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
526 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
527
528 T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
529
530 }
531
532 /*
533 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
534 * case those tests will not be performed.
535 */
536 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
537 {
538 if(yaffs_SkipVerification(obj->myDev))
539 return;
540
541 if(!(tags && obj && oh)){
542 T(YAFFS_TRACE_VERIFY,
543 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
544 (__u32)tags,(__u32)obj,(__u32)oh));
545 return;
546 }
547
548 if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
549 oh->type > YAFFS_OBJECT_TYPE_MAX)
550 T(YAFFS_TRACE_VERIFY,
551 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
552 tags->objectId, oh->type));
553
554 if(tags->objectId != obj->objectId)
555 T(YAFFS_TRACE_VERIFY,
556 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
557 tags->objectId, obj->objectId));
558
559
560 /*
561 * Check that the object's parent ids match if parentCheck requested.
562 *
563 * Tests do not apply to the root object.
564 */
565
566 if(parentCheck && tags->objectId > 1 && !obj->parent)
567 T(YAFFS_TRACE_VERIFY,
568 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
569 tags->objectId, oh->parentObjectId));
570
571
572 if(parentCheck && obj->parent &&
573 oh->parentObjectId != obj->parent->objectId &&
574 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
575 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
576 T(YAFFS_TRACE_VERIFY,
577 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
578 tags->objectId, oh->parentObjectId, obj->parent->objectId));
579
580
581 if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
582 T(YAFFS_TRACE_VERIFY,
583 (TSTR("Obj %d header name is NULL"TENDSTR),
584 obj->objectId));
585
586 if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
587 T(YAFFS_TRACE_VERIFY,
588 (TSTR("Obj %d header name is 0xFF"TENDSTR),
589 obj->objectId));
590 }
591
592
593
594 static int yaffs_VerifyTnodeWorker(yaffs_Object * obj, yaffs_Tnode * tn,
595 __u32 level, int chunkOffset)
596 {
597 int i;
598 yaffs_Device *dev = obj->myDev;
599 int ok = 1;
600 int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
601
602 if (tn) {
603 if (level > 0) {
604
605 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
606 if (tn->internal[i]) {
607 ok = yaffs_VerifyTnodeWorker(obj,
608 tn->internal[i],
609 level - 1,
610 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
611 }
612 }
613 } else if (level == 0) {
614 int i;
615 yaffs_ExtendedTags tags;
616 __u32 objectId = obj->objectId;
617
618 chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
619
620 for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){
621 __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
622
623 if(theChunk > 0){
624 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
625 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
626 if(tags.objectId != objectId || tags.chunkId != chunkOffset){
627 T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
628 objectId, chunkOffset, theChunk,
629 tags.objectId, tags.chunkId));
630 }
631 }
632 chunkOffset++;
633 }
634 }
635 }
636
637 return ok;
638
639 }
640
641
642 static void yaffs_VerifyFile(yaffs_Object *obj)
643 {
644 int requiredTallness;
645 int actualTallness;
646 __u32 lastChunk;
647 __u32 x;
648 __u32 i;
649 int ok;
650 yaffs_Device *dev;
651 yaffs_ExtendedTags tags;
652 yaffs_Tnode *tn;
653 __u32 objectId;
654
655 if(obj && yaffs_SkipVerification(obj->myDev))
656 return;
657
658 dev = obj->myDev;
659 objectId = obj->objectId;
660
661 /* Check file size is consistent with tnode depth */
662 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
663 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
664 requiredTallness = 0;
665 while (x> 0) {
666 x >>= YAFFS_TNODES_INTERNAL_BITS;
667 requiredTallness++;
668 }
669
670 actualTallness = obj->variant.fileVariant.topLevel;
671
672 if(requiredTallness > actualTallness )
673 T(YAFFS_TRACE_VERIFY,
674 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
675 obj->objectId,actualTallness, requiredTallness));
676
677
678 /* Check that the chunks in the tnode tree are all correct.
679 * We do this by scanning through the tnode tree and
680 * checking the tags for every chunk match.
681 */
682
683 if(yaffs_SkipNANDVerification(dev))
684 return;
685
686 for(i = 1; i <= lastChunk; i++){
687 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
688
689 if (tn) {
690 __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
691 if(theChunk > 0){
692 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
693 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
694 if(tags.objectId != objectId || tags.chunkId != i){
695 T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
696 objectId, i, theChunk,
697 tags.objectId, tags.chunkId));
698 }
699 }
700 }
701
702 }
703
704 }
705
706 static void yaffs_VerifyDirectory(yaffs_Object *obj)
707 {
708 if(obj && yaffs_SkipVerification(obj->myDev))
709 return;
710
711 }
712
713 static void yaffs_VerifyHardLink(yaffs_Object *obj)
714 {
715 if(obj && yaffs_SkipVerification(obj->myDev))
716 return;
717
718 /* Verify sane equivalent object */
719 }
720
721 static void yaffs_VerifySymlink(yaffs_Object *obj)
722 {
723 if(obj && yaffs_SkipVerification(obj->myDev))
724 return;
725
726 /* Verify symlink string */
727 }
728
729 static void yaffs_VerifySpecial(yaffs_Object *obj)
730 {
731 if(obj && yaffs_SkipVerification(obj->myDev))
732 return;
733 }
734
735 static void yaffs_VerifyObject(yaffs_Object *obj)
736 {
737 yaffs_Device *dev;
738
739 __u32 chunkMin;
740 __u32 chunkMax;
741
742 __u32 chunkIdOk;
743 __u32 chunkIsLive;
744
745 if(!obj)
746 return;
747
748 dev = obj->myDev;
749
750 if(yaffs_SkipVerification(dev))
751 return;
752
753 /* Check sane object header chunk */
754
755 chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
756 chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
757
758 chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
759 chunkIsLive = chunkIdOk &&
760 yaffs_CheckChunkBit(dev,
761 obj->chunkId / dev->nChunksPerBlock,
762 obj->chunkId % dev->nChunksPerBlock);
763 if(!obj->fake &&
764 (!chunkIdOk || !chunkIsLive)) {
765 T(YAFFS_TRACE_VERIFY,
766 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
767 obj->objectId,obj->chunkId,
768 chunkIdOk ? "" : ",out of range",
769 chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
770 }
771
772 if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
773 yaffs_ExtendedTags tags;
774 yaffs_ObjectHeader *oh;
775 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
776
777 oh = (yaffs_ObjectHeader *)buffer;
778
779 yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
780
781 yaffs_VerifyObjectHeader(obj,oh,&tags,1);
782
783 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
784 }
785
786 /* Verify it has a parent */
787 if(obj && !obj->fake &&
788 (!obj->parent || obj->parent->myDev != dev)){
789 T(YAFFS_TRACE_VERIFY,
790 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
791 obj->objectId,obj->parent));
792 }
793
794 /* Verify parent is a directory */
795 if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
796 T(YAFFS_TRACE_VERIFY,
797 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
798 obj->objectId,obj->parent->variantType));
799 }
800
801 switch(obj->variantType){
802 case YAFFS_OBJECT_TYPE_FILE:
803 yaffs_VerifyFile(obj);
804 break;
805 case YAFFS_OBJECT_TYPE_SYMLINK:
806 yaffs_VerifySymlink(obj);
807 break;
808 case YAFFS_OBJECT_TYPE_DIRECTORY:
809 yaffs_VerifyDirectory(obj);
810 break;
811 case YAFFS_OBJECT_TYPE_HARDLINK:
812 yaffs_VerifyHardLink(obj);
813 break;
814 case YAFFS_OBJECT_TYPE_SPECIAL:
815 yaffs_VerifySpecial(obj);
816 break;
817 case YAFFS_OBJECT_TYPE_UNKNOWN:
818 default:
819 T(YAFFS_TRACE_VERIFY,
820 (TSTR("Obj %d has illegaltype %d"TENDSTR),
821 obj->objectId,obj->variantType));
822 break;
823 }
824
825
826 }
827
828 static void yaffs_VerifyObjects(yaffs_Device *dev)
829 {
830 yaffs_Object *obj;
831 int i;
832 struct list_head *lh;
833
834 if(yaffs_SkipVerification(dev))
835 return;
836
837 /* Iterate through the objects in each hash entry */
838
839 for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++){
840 list_for_each(lh, &dev->objectBucket[i].list) {
841 if (lh) {
842 obj = list_entry(lh, yaffs_Object, hashLink);
843 yaffs_VerifyObject(obj);
844 }
845 }
846 }
847
848 }
849
850
851 /*
852 * Simple hash function. Needs to have a reasonable spread
853 */
854
855 static Y_INLINE int yaffs_HashFunction(int n)
856 {
857 n = abs(n);
858 return (n % YAFFS_NOBJECT_BUCKETS);
859 }
860
861 /*
862 * Access functions to useful fake objects
863 */
864
865 yaffs_Object *yaffs_Root(yaffs_Device * dev)
866 {
867 return dev->rootDir;
868 }
869
870 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
871 {
872 return dev->lostNFoundDir;
873 }
874
875
876 /*
877 * Erased NAND checking functions
878 */
879
880 int yaffs_CheckFF(__u8 * buffer, int nBytes)
881 {
882 /* Horrible, slow implementation */
883 while (nBytes--) {
884 if (*buffer != 0xFF)
885 return 0;
886 buffer++;
887 }
888 return 1;
889 }
890
891 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
892 int chunkInNAND)
893 {
894
895 int retval = YAFFS_OK;
896 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
897 yaffs_ExtendedTags tags;
898 int result;
899
900 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
901
902 if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
903 retval = YAFFS_FAIL;
904
905
906 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
907 T(YAFFS_TRACE_NANDACCESS,
908 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
909 retval = YAFFS_FAIL;
910 }
911
912 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
913
914 return retval;
915
916 }
917
918
919 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
920 const __u8 * data,
921 yaffs_ExtendedTags * tags,
922 int useReserve)
923 {
924 int attempts = 0;
925 int writeOk = 0;
926 int chunk;
927
928 yaffs_InvalidateCheckpoint(dev);
929
930 do {
931 yaffs_BlockInfo *bi = 0;
932 int erasedOk = 0;
933
934 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
935 if (chunk < 0) {
936 /* no space */
937 break;
938 }
939
940 /* First check this chunk is erased, if it needs
941 * checking. The checking policy (unless forced
942 * always on) is as follows:
943 *
944 * Check the first page we try to write in a block.
945 * If the check passes then we don't need to check any
946 * more. If the check fails, we check again...
947 * If the block has been erased, we don't need to check.
948 *
949 * However, if the block has been prioritised for gc,
950 * then we think there might be something odd about
951 * this block and stop using it.
952 *
953 * Rationale: We should only ever see chunks that have
954 * not been erased if there was a partially written
955 * chunk due to power loss. This checking policy should
956 * catch that case with very few checks and thus save a
957 * lot of checks that are most likely not needed.
958 */
959 if (bi->gcPrioritise) {
960 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
961 /* try another chunk */
962 continue;
963 }
964
965 /* let's give it a try */
966 attempts++;
967
968 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
969 bi->skipErasedCheck = 0;
970 #endif
971 if (!bi->skipErasedCheck) {
972 erasedOk = yaffs_CheckChunkErased(dev, chunk);
973 if (erasedOk != YAFFS_OK) {
974 T(YAFFS_TRACE_ERROR,
975 (TSTR ("**>> yaffs chunk %d was not erased"
976 TENDSTR), chunk));
977
978 /* try another chunk */
979 continue;
980 }
981 bi->skipErasedCheck = 1;
982 }
983
984 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
985 data, tags);
986 if (writeOk != YAFFS_OK) {
987 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
988 /* try another chunk */
989 continue;
990 }
991
992 /* Copy the data into the robustification buffer */
993 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
994
995 } while (writeOk != YAFFS_OK && attempts < yaffs_wr_attempts);
996
997 if (attempts > 1) {
998 T(YAFFS_TRACE_ERROR,
999 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1000 attempts));
1001
1002 dev->nRetriedWrites += (attempts - 1);
1003 }
1004
1005 return chunk;
1006 }
1007
1008 /*
1009 * Block retiring for handling a broken block.
1010 */
1011
1012 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
1013 {
1014 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1015
1016 yaffs_InvalidateCheckpoint(dev);
1017
1018 yaffs_MarkBlockBad(dev, blockInNAND);
1019
1020 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1021 bi->gcPrioritise = 0;
1022 bi->needsRetiring = 0;
1023
1024 dev->nRetiredBlocks++;
1025 }
1026
1027 /*
1028 * Functions for robustisizing TODO
1029 *
1030 */
1031
1032 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
1033 const __u8 * data,
1034 const yaffs_ExtendedTags * tags)
1035 {
1036 }
1037
1038 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
1039 const yaffs_ExtendedTags * tags)
1040 {
1041 }
1042
1043 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1044 {
1045 if(!bi->gcPrioritise){
1046 bi->gcPrioritise = 1;
1047 dev->hasPendingPrioritisedGCs = 1;
1048 bi->chunkErrorStrikes ++;
1049
1050 if(bi->chunkErrorStrikes > 3){
1051 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1052 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1053
1054 }
1055
1056 }
1057 }
1058
1059 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
1060 {
1061
1062 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1063 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1064
1065 yaffs_HandleChunkError(dev,bi);
1066
1067
1068 if(erasedOk ) {
1069 /* Was an actual write failure, so mark the block for retirement */
1070 bi->needsRetiring = 1;
1071 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1072 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1073
1074
1075 }
1076
1077 /* Delete the chunk */
1078 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1079 }
1080
1081
1082 /*---------------- Name handling functions ------------*/
1083
1084 static __u16 yaffs_CalcNameSum(const YCHAR * name)
1085 {
1086 __u16 sum = 0;
1087 __u16 i = 1;
1088
1089 YUCHAR *bname = (YUCHAR *) name;
1090 if (bname) {
1091 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1092
1093 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1094 sum += yaffs_toupper(*bname) * i;
1095 #else
1096 sum += (*bname) * i;
1097 #endif
1098 i++;
1099 bname++;
1100 }
1101 }
1102 return sum;
1103 }
1104
1105 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
1106 {
1107 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1108 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
1109 yaffs_strcpy(obj->shortName, name);
1110 } else {
1111 obj->shortName[0] = _Y('\0');
1112 }
1113 #endif
1114 obj->sum = yaffs_CalcNameSum(name);
1115 }
1116
1117 /*-------------------- TNODES -------------------
1118
1119 * List of spare tnodes
1120 * The list is hooked together using the first pointer
1121 * in the tnode.
1122 */
1123
1124 /* yaffs_CreateTnodes creates a bunch more tnodes and
1125 * adds them to the tnode free list.
1126 * Don't use this function directly
1127 */
1128
1129 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
1130 {
1131 int i;
1132 int tnodeSize;
1133 yaffs_Tnode *newTnodes;
1134 __u8 *mem;
1135 yaffs_Tnode *curr;
1136 yaffs_Tnode *next;
1137 yaffs_TnodeList *tnl;
1138
1139 if (nTnodes < 1)
1140 return YAFFS_OK;
1141
1142 /* Calculate the tnode size in bytes for variable width tnode support.
1143 * Must be a multiple of 32-bits */
1144 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1145
1146 /* make these things */
1147
1148 newTnodes = YMALLOC(nTnodes * tnodeSize);
1149 mem = (__u8 *)newTnodes;
1150
1151 if (!newTnodes) {
1152 T(YAFFS_TRACE_ERROR,
1153 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1154 return YAFFS_FAIL;
1155 }
1156
1157 /* Hook them into the free list */
1158 #if 0
1159 for (i = 0; i < nTnodes - 1; i++) {
1160 newTnodes[i].internal[0] = &newTnodes[i + 1];
1161 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1162 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1163 #endif
1164 }
1165
1166 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1167 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1168 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1169 #endif
1170 dev->freeTnodes = newTnodes;
1171 #else
1172 /* New hookup for wide tnodes */
1173 for(i = 0; i < nTnodes -1; i++) {
1174 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1175 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1176 curr->internal[0] = next;
1177 }
1178
1179 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1180 curr->internal[0] = dev->freeTnodes;
1181 dev->freeTnodes = (yaffs_Tnode *)mem;
1182
1183 #endif
1184
1185
1186 dev->nFreeTnodes += nTnodes;
1187 dev->nTnodesCreated += nTnodes;
1188
1189 /* Now add this bunch of tnodes to a list for freeing up.
1190 * NB If we can't add this to the management list it isn't fatal
1191 * but it just means we can't free this bunch of tnodes later.
1192 */
1193
1194 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1195 if (!tnl) {
1196 T(YAFFS_TRACE_ERROR,
1197 (TSTR
1198 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1199 return YAFFS_FAIL;
1200
1201 } else {
1202 tnl->tnodes = newTnodes;
1203 tnl->next = dev->allocatedTnodeList;
1204 dev->allocatedTnodeList = tnl;
1205 }
1206
1207 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1208
1209 return YAFFS_OK;
1210 }
1211
1212 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1213
1214 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
1215 {
1216 yaffs_Tnode *tn = NULL;
1217
1218 /* If there are none left make more */
1219 if (!dev->freeTnodes) {
1220 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1221 }
1222
1223 if (dev->freeTnodes) {
1224 tn = dev->freeTnodes;
1225 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1226 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1227 /* Hoosterman, this thing looks like it isn't in the list */
1228 T(YAFFS_TRACE_ALWAYS,
1229 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1230 }
1231 #endif
1232 dev->freeTnodes = dev->freeTnodes->internal[0];
1233 dev->nFreeTnodes--;
1234 }
1235
1236 return tn;
1237 }
1238
1239 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
1240 {
1241 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1242
1243 if(tn)
1244 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1245
1246 return tn;
1247 }
1248
1249 /* FreeTnode frees up a tnode and puts it back on the free list */
1250 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
1251 {
1252 if (tn) {
1253 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1254 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1255 /* Hoosterman, this thing looks like it is already in the list */
1256 T(YAFFS_TRACE_ALWAYS,
1257 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1258 }
1259 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1260 #endif
1261 tn->internal[0] = dev->freeTnodes;
1262 dev->freeTnodes = tn;
1263 dev->nFreeTnodes++;
1264 }
1265 }
1266
1267 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
1268 {
1269 /* Free the list of allocated tnodes */
1270 yaffs_TnodeList *tmp;
1271
1272 while (dev->allocatedTnodeList) {
1273 tmp = dev->allocatedTnodeList->next;
1274
1275 YFREE(dev->allocatedTnodeList->tnodes);
1276 YFREE(dev->allocatedTnodeList);
1277 dev->allocatedTnodeList = tmp;
1278
1279 }
1280
1281 dev->freeTnodes = NULL;
1282 dev->nFreeTnodes = 0;
1283 }
1284
1285 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
1286 {
1287 dev->allocatedTnodeList = NULL;
1288 dev->freeTnodes = NULL;
1289 dev->nFreeTnodes = 0;
1290 dev->nTnodesCreated = 0;
1291
1292 }
1293
1294
1295 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
1296 {
1297 __u32 *map = (__u32 *)tn;
1298 __u32 bitInMap;
1299 __u32 bitInWord;
1300 __u32 wordInMap;
1301 __u32 mask;
1302
1303 pos &= YAFFS_TNODES_LEVEL0_MASK;
1304 val >>= dev->chunkGroupBits;
1305
1306 bitInMap = pos * dev->tnodeWidth;
1307 wordInMap = bitInMap /32;
1308 bitInWord = bitInMap & (32 -1);
1309
1310 mask = dev->tnodeMask << bitInWord;
1311
1312 map[wordInMap] &= ~mask;
1313 map[wordInMap] |= (mask & (val << bitInWord));
1314
1315 if(dev->tnodeWidth > (32-bitInWord)) {
1316 bitInWord = (32 - bitInWord);
1317 wordInMap++;;
1318 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1319 map[wordInMap] &= ~mask;
1320 map[wordInMap] |= (mask & (val >> bitInWord));
1321 }
1322 }
1323
1324 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
1325 {
1326 __u32 *map = (__u32 *)tn;
1327 __u32 bitInMap;
1328 __u32 bitInWord;
1329 __u32 wordInMap;
1330 __u32 val;
1331
1332 pos &= YAFFS_TNODES_LEVEL0_MASK;
1333
1334 bitInMap = pos * dev->tnodeWidth;
1335 wordInMap = bitInMap /32;
1336 bitInWord = bitInMap & (32 -1);
1337
1338 val = map[wordInMap] >> bitInWord;
1339
1340 if(dev->tnodeWidth > (32-bitInWord)) {
1341 bitInWord = (32 - bitInWord);
1342 wordInMap++;;
1343 val |= (map[wordInMap] << bitInWord);
1344 }
1345
1346 val &= dev->tnodeMask;
1347 val <<= dev->chunkGroupBits;
1348
1349 return val;
1350 }
1351
1352 /* ------------------- End of individual tnode manipulation -----------------*/
1353
1354 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1355 * The look up tree is represented by the top tnode and the number of topLevel
1356 * in the tree. 0 means only the level 0 tnode is in the tree.
1357 */
1358
1359 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1360 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
1361 yaffs_FileStructure * fStruct,
1362 __u32 chunkId)
1363 {
1364
1365 yaffs_Tnode *tn = fStruct->top;
1366 __u32 i;
1367 int requiredTallness;
1368 int level = fStruct->topLevel;
1369
1370 /* Check sane level and chunk Id */
1371 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
1372 return NULL;
1373 }
1374
1375 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1376 return NULL;
1377 }
1378
1379 /* First check we're tall enough (ie enough topLevel) */
1380
1381 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1382 requiredTallness = 0;
1383 while (i) {
1384 i >>= YAFFS_TNODES_INTERNAL_BITS;
1385 requiredTallness++;
1386 }
1387
1388 if (requiredTallness > fStruct->topLevel) {
1389 /* Not tall enough, so we can't find it, return NULL. */
1390 return NULL;
1391 }
1392
1393 /* Traverse down to level 0 */
1394 while (level > 0 && tn) {
1395 tn = tn->
1396 internal[(chunkId >>
1397 ( YAFFS_TNODES_LEVEL0_BITS +
1398 (level - 1) *
1399 YAFFS_TNODES_INTERNAL_BITS)
1400 ) &
1401 YAFFS_TNODES_INTERNAL_MASK];
1402 level--;
1403
1404 }
1405
1406 return tn;
1407 }
1408
1409 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1410 * This happens in two steps:
1411 * 1. If the tree isn't tall enough, then make it taller.
1412 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1413 *
1414 * Used when modifying the tree.
1415 *
1416 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1417 * be plugged into the ttree.
1418 */
1419
1420 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
1421 yaffs_FileStructure * fStruct,
1422 __u32 chunkId,
1423 yaffs_Tnode *passedTn)
1424 {
1425
1426 int requiredTallness;
1427 int i;
1428 int l;
1429 yaffs_Tnode *tn;
1430
1431 __u32 x;
1432
1433
1434 /* Check sane level and page Id */
1435 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
1436 return NULL;
1437 }
1438
1439 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1440 return NULL;
1441 }
1442
1443 /* First check we're tall enough (ie enough topLevel) */
1444
1445 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1446 requiredTallness = 0;
1447 while (x) {
1448 x >>= YAFFS_TNODES_INTERNAL_BITS;
1449 requiredTallness++;
1450 }
1451
1452
1453 if (requiredTallness > fStruct->topLevel) {
1454 /* Not tall enough,gotta make the tree taller */
1455 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1456
1457 tn = yaffs_GetTnode(dev);
1458
1459 if (tn) {
1460 tn->internal[0] = fStruct->top;
1461 fStruct->top = tn;
1462 } else {
1463 T(YAFFS_TRACE_ERROR,
1464 (TSTR("yaffs: no more tnodes" TENDSTR)));
1465 }
1466 }
1467
1468 fStruct->topLevel = requiredTallness;
1469 }
1470
1471 /* Traverse down to level 0, adding anything we need */
1472
1473 l = fStruct->topLevel;
1474 tn = fStruct->top;
1475
1476 if(l > 0) {
1477 while (l > 0 && tn) {
1478 x = (chunkId >>
1479 ( YAFFS_TNODES_LEVEL0_BITS +
1480 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1481 YAFFS_TNODES_INTERNAL_MASK;
1482
1483
1484 if((l>1) && !tn->internal[x]){
1485 /* Add missing non-level-zero tnode */
1486 tn->internal[x] = yaffs_GetTnode(dev);
1487
1488 } else if(l == 1) {
1489 /* Looking from level 1 at level 0 */
1490 if (passedTn) {
1491 /* If we already have one, then release it.*/
1492 if(tn->internal[x])
1493 yaffs_FreeTnode(dev,tn->internal[x]);
1494 tn->internal[x] = passedTn;
1495
1496 } else if(!tn->internal[x]) {
1497 /* Don't have one, none passed in */
1498 tn->internal[x] = yaffs_GetTnode(dev);
1499 }
1500 }
1501
1502 tn = tn->internal[x];
1503 l--;
1504 }
1505 } else {
1506 /* top is level 0 */
1507 if(passedTn) {
1508 memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1509 yaffs_FreeTnode(dev,passedTn);
1510 }
1511 }
1512
1513 return tn;
1514 }
1515
1516 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
1517 yaffs_ExtendedTags * tags, int objectId,
1518 int chunkInInode)
1519 {
1520 int j;
1521
1522 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1523 if (yaffs_CheckChunkBit
1524 (dev, theChunk / dev->nChunksPerBlock,
1525 theChunk % dev->nChunksPerBlock)) {
1526 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1527 tags);
1528 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1529 /* found it; */
1530 return theChunk;
1531
1532 }
1533 }
1534 theChunk++;
1535 }
1536 return -1;
1537 }
1538
1539
1540 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1541 * chunks and tnodes in the file
1542 * Returns 1 if the tree was deleted.
1543 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1544 */
1545
1546 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
1547 int chunkOffset, int *limit)
1548 {
1549 int i;
1550 int chunkInInode;
1551 int theChunk;
1552 yaffs_ExtendedTags tags;
1553 int foundChunk;
1554 yaffs_Device *dev = in->myDev;
1555
1556 int allDone = 1;
1557
1558 if (tn) {
1559 if (level > 0) {
1560
1561 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1562 i--) {
1563 if (tn->internal[i]) {
1564 if (limit && (*limit) < 0) {
1565 allDone = 0;
1566 } else {
1567 allDone =
1568 yaffs_DeleteWorker(in,
1569 tn->
1570 internal
1571 [i],
1572 level -
1573 1,
1574 (chunkOffset
1575 <<
1576 YAFFS_TNODES_INTERNAL_BITS)
1577 + i,
1578 limit);
1579 }
1580 if (allDone) {
1581 yaffs_FreeTnode(dev,
1582 tn->
1583 internal[i]);
1584 tn->internal[i] = NULL;
1585 }
1586 }
1587
1588 }
1589 return (allDone) ? 1 : 0;
1590 } else if (level == 0) {
1591 int hitLimit = 0;
1592
1593 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1594 i--) {
1595 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1596 if (theChunk) {
1597
1598 chunkInInode =
1599 (chunkOffset <<
1600 YAFFS_TNODES_LEVEL0_BITS) + i;
1601
1602 foundChunk =
1603 yaffs_FindChunkInGroup(dev,
1604 theChunk,
1605 &tags,
1606 in->objectId,
1607 chunkInInode);
1608
1609 if (foundChunk > 0) {
1610 yaffs_DeleteChunk(dev,
1611 foundChunk, 1,
1612 __LINE__);
1613 in->nDataChunks--;
1614 if (limit) {
1615 *limit = *limit - 1;
1616 if (*limit <= 0) {
1617 hitLimit = 1;
1618 }
1619 }
1620
1621 }
1622
1623 yaffs_PutLevel0Tnode(dev,tn,i,0);
1624 }
1625
1626 }
1627 return (i < 0) ? 1 : 0;
1628
1629 }
1630
1631 }
1632
1633 return 1;
1634
1635 }
1636
1637 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1638 {
1639
1640 yaffs_BlockInfo *theBlock;
1641
1642 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1643
1644 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1645 if (theBlock) {
1646 theBlock->softDeletions++;
1647 dev->nFreeChunks++;
1648 }
1649 }
1650
1651 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1652 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1653 * of the tnode.
1654 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1655 */
1656
1657 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1658 __u32 level, int chunkOffset)
1659 {
1660 int i;
1661 int theChunk;
1662 int allDone = 1;
1663 yaffs_Device *dev = in->myDev;
1664
1665 if (tn) {
1666 if (level > 0) {
1667
1668 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1669 i--) {
1670 if (tn->internal[i]) {
1671 allDone =
1672 yaffs_SoftDeleteWorker(in,
1673 tn->
1674 internal[i],
1675 level - 1,
1676 (chunkOffset
1677 <<
1678 YAFFS_TNODES_INTERNAL_BITS)
1679 + i);
1680 if (allDone) {
1681 yaffs_FreeTnode(dev,
1682 tn->
1683 internal[i]);
1684 tn->internal[i] = NULL;
1685 } else {
1686 /* Hoosterman... how could this happen? */
1687 }
1688 }
1689 }
1690 return (allDone) ? 1 : 0;
1691 } else if (level == 0) {
1692
1693 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1694 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1695 if (theChunk) {
1696 /* Note this does not find the real chunk, only the chunk group.
1697 * We make an assumption that a chunk group is not larger than
1698 * a block.
1699 */
1700 yaffs_SoftDeleteChunk(dev, theChunk);
1701 yaffs_PutLevel0Tnode(dev,tn,i,0);
1702 }
1703
1704 }
1705 return 1;
1706
1707 }
1708
1709 }
1710
1711 return 1;
1712
1713 }
1714
1715 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1716 {
1717 if (obj->deleted &&
1718 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1719 if (obj->nDataChunks <= 0) {
1720 /* Empty file with no duplicate object headers, just delete it immediately */
1721 yaffs_FreeTnode(obj->myDev,
1722 obj->variant.fileVariant.top);
1723 obj->variant.fileVariant.top = NULL;
1724 T(YAFFS_TRACE_TRACING,
1725 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1726 obj->objectId));
1727 yaffs_DoGenericObjectDeletion(obj);
1728 } else {
1729 yaffs_SoftDeleteWorker(obj,
1730 obj->variant.fileVariant.top,
1731 obj->variant.fileVariant.
1732 topLevel, 0);
1733 obj->softDeleted = 1;
1734 }
1735 }
1736 }
1737
1738 /* Pruning removes any part of the file structure tree that is beyond the
1739 * bounds of the file (ie that does not point to chunks).
1740 *
1741 * A file should only get pruned when its size is reduced.
1742 *
1743 * Before pruning, the chunks must be pulled from the tree and the
1744 * level 0 tnode entries must be zeroed out.
1745 * Could also use this for file deletion, but that's probably better handled
1746 * by a special case.
1747 */
1748
1749 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1750 __u32 level, int del0)
1751 {
1752 int i;
1753 int hasData;
1754
1755 if (tn) {
1756 hasData = 0;
1757
1758 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1759 if (tn->internal[i] && level > 0) {
1760 tn->internal[i] =
1761 yaffs_PruneWorker(dev, tn->internal[i],
1762 level - 1,
1763 (i == 0) ? del0 : 1);
1764 }
1765
1766 if (tn->internal[i]) {
1767 hasData++;
1768 }
1769 }
1770
1771 if (hasData == 0 && del0) {
1772 /* Free and return NULL */
1773
1774 yaffs_FreeTnode(dev, tn);
1775 tn = NULL;
1776 }
1777
1778 }
1779
1780 return tn;
1781
1782 }
1783
1784 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1785 yaffs_FileStructure * fStruct)
1786 {
1787 int i;
1788 int hasData;
1789 int done = 0;
1790 yaffs_Tnode *tn;
1791
1792 if (fStruct->topLevel > 0) {
1793 fStruct->top =
1794 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1795
1796 /* Now we have a tree with all the non-zero branches NULL but the height
1797 * is the same as it was.
1798 * Let's see if we can trim internal tnodes to shorten the tree.
1799 * We can do this if only the 0th element in the tnode is in use
1800 * (ie all the non-zero are NULL)
1801 */
1802
1803 while (fStruct->topLevel && !done) {
1804 tn = fStruct->top;
1805
1806 hasData = 0;
1807 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1808 if (tn->internal[i]) {
1809 hasData++;
1810 }
1811 }
1812
1813 if (!hasData) {
1814 fStruct->top = tn->internal[0];
1815 fStruct->topLevel--;
1816 yaffs_FreeTnode(dev, tn);
1817 } else {
1818 done = 1;
1819 }
1820 }
1821 }
1822
1823 return YAFFS_OK;
1824 }
1825
1826 /*-------------------- End of File Structure functions.-------------------*/
1827
1828 /* yaffs_CreateFreeObjects creates a bunch more objects and
1829 * adds them to the object free list.
1830 */
1831 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1832 {
1833 int i;
1834 yaffs_Object *newObjects;
1835 yaffs_ObjectList *list;
1836
1837 if (nObjects < 1)
1838 return YAFFS_OK;
1839
1840 /* make these things */
1841 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1842 list = YMALLOC(sizeof(yaffs_ObjectList));
1843
1844 if (!newObjects || !list) {
1845 if(newObjects)
1846 YFREE(newObjects);
1847 if(list)
1848 YFREE(list);
1849 T(YAFFS_TRACE_ALLOCATE,
1850 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1851 return YAFFS_FAIL;
1852 }
1853
1854 /* Hook them into the free list */
1855 for (i = 0; i < nObjects - 1; i++) {
1856 newObjects[i].siblings.next =
1857 (struct list_head *)(&newObjects[i + 1]);
1858 }
1859
1860 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1861 dev->freeObjects = newObjects;
1862 dev->nFreeObjects += nObjects;
1863 dev->nObjectsCreated += nObjects;
1864
1865 /* Now add this bunch of Objects to a list for freeing up. */
1866
1867 list->objects = newObjects;
1868 list->next = dev->allocatedObjectList;
1869 dev->allocatedObjectList = list;
1870
1871 return YAFFS_OK;
1872 }
1873
1874
1875 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1876 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1877 {
1878 yaffs_Object *tn = NULL;
1879
1880 /* If there are none left make more */
1881 if (!dev->freeObjects) {
1882 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1883 }
1884
1885 if (dev->freeObjects) {
1886 tn = dev->freeObjects;
1887 dev->freeObjects =
1888 (yaffs_Object *) (dev->freeObjects->siblings.next);
1889 dev->nFreeObjects--;
1890
1891 /* Now sweeten it up... */
1892
1893 memset(tn, 0, sizeof(yaffs_Object));
1894 tn->myDev = dev;
1895 tn->chunkId = -1;
1896 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1897 INIT_LIST_HEAD(&(tn->hardLinks));
1898 INIT_LIST_HEAD(&(tn->hashLink));
1899 INIT_LIST_HEAD(&tn->siblings);
1900
1901 /* Add it to the lost and found directory.
1902 * NB Can't put root or lostNFound in lostNFound so
1903 * check if lostNFound exists first
1904 */
1905 if (dev->lostNFoundDir) {
1906 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1907 }
1908 }
1909
1910 return tn;
1911 }
1912
1913 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1914 __u32 mode)
1915 {
1916
1917 yaffs_Object *obj =
1918 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1919 if (obj) {
1920 obj->fake = 1; /* it is fake so it has no NAND presence... */
1921 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1922 obj->unlinkAllowed = 0; /* ... or unlink it */
1923 obj->deleted = 0;
1924 obj->unlinked = 0;
1925 obj->yst_mode = mode;
1926 obj->myDev = dev;
1927 obj->chunkId = 0; /* Not a valid chunk. */
1928 }
1929
1930 return obj;
1931
1932 }
1933
1934 static void yaffs_UnhashObject(yaffs_Object * tn)
1935 {
1936 int bucket;
1937 yaffs_Device *dev = tn->myDev;
1938
1939 /* If it is still linked into the bucket list, free from the list */
1940 if (!list_empty(&tn->hashLink)) {
1941 list_del_init(&tn->hashLink);
1942 bucket = yaffs_HashFunction(tn->objectId);
1943 dev->objectBucket[bucket].count--;
1944 }
1945
1946 }
1947
1948 /* FreeObject frees up a Object and puts it back on the free list */
1949 static void yaffs_FreeObject(yaffs_Object * tn)
1950 {
1951
1952 yaffs_Device *dev = tn->myDev;
1953
1954 #ifdef __KERNEL__
1955 if (tn->myInode) {
1956 /* We're still hooked up to a cached inode.
1957 * Don't delete now, but mark for later deletion
1958 */
1959 tn->deferedFree = 1;
1960 return;
1961 }
1962 #endif
1963
1964 yaffs_UnhashObject(tn);
1965
1966 /* Link into the free list. */
1967 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1968 dev->freeObjects = tn;
1969 dev->nFreeObjects++;
1970 }
1971
1972 #ifdef __KERNEL__
1973
1974 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1975 {
1976 if (obj->deferedFree) {
1977 yaffs_FreeObject(obj);
1978 }
1979 }
1980
1981 #endif
1982
1983 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1984 {
1985 /* Free the list of allocated Objects */
1986
1987 yaffs_ObjectList *tmp;
1988
1989 while (dev->allocatedObjectList) {
1990 tmp = dev->allocatedObjectList->next;
1991 YFREE(dev->allocatedObjectList->objects);
1992 YFREE(dev->allocatedObjectList);
1993
1994 dev->allocatedObjectList = tmp;
1995 }
1996
1997 dev->freeObjects = NULL;
1998 dev->nFreeObjects = 0;
1999 }
2000
2001 static void yaffs_InitialiseObjects(yaffs_Device * dev)
2002 {
2003 int i;
2004
2005 dev->allocatedObjectList = NULL;
2006 dev->freeObjects = NULL;
2007 dev->nFreeObjects = 0;
2008
2009 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2010 INIT_LIST_HEAD(&dev->objectBucket[i].list);
2011 dev->objectBucket[i].count = 0;
2012 }
2013
2014 }
2015
2016 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
2017 {
2018 static int x = 0;
2019 int i;
2020 int l = 999;
2021 int lowest = 999999;
2022
2023 /* First let's see if we can find one that's empty. */
2024
2025 for (i = 0; i < 10 && lowest > 0; i++) {
2026 x++;
2027 x %= YAFFS_NOBJECT_BUCKETS;
2028 if (dev->objectBucket[x].count < lowest) {
2029 lowest = dev->objectBucket[x].count;
2030 l = x;
2031 }
2032
2033 }
2034
2035 /* If we didn't find an empty list, then try
2036 * looking a bit further for a short one
2037 */
2038
2039 for (i = 0; i < 10 && lowest > 3; i++) {
2040 x++;
2041 x %= YAFFS_NOBJECT_BUCKETS;
2042 if (dev->objectBucket[x].count < lowest) {
2043 lowest = dev->objectBucket[x].count;
2044 l = x;
2045 }
2046
2047 }
2048
2049 return l;
2050 }
2051
2052 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
2053 {
2054 int bucket = yaffs_FindNiceObjectBucket(dev);
2055
2056 /* Now find an object value that has not already been taken
2057 * by scanning the list.
2058 */
2059
2060 int found = 0;
2061 struct list_head *i;
2062
2063 __u32 n = (__u32) bucket;
2064
2065 /* yaffs_CheckObjectHashSanity(); */
2066
2067 while (!found) {
2068 found = 1;
2069 n += YAFFS_NOBJECT_BUCKETS;
2070 if (1 || dev->objectBucket[bucket].count > 0) {
2071 list_for_each(i, &dev->objectBucket[bucket].list) {
2072 /* If there is already one in the list */
2073 if (i
2074 && list_entry(i, yaffs_Object,
2075 hashLink)->objectId == n) {
2076 found = 0;
2077 }
2078 }
2079 }
2080 }
2081
2082
2083 return n;
2084 }
2085
2086 static void yaffs_HashObject(yaffs_Object * in)
2087 {
2088 int bucket = yaffs_HashFunction(in->objectId);
2089 yaffs_Device *dev = in->myDev;
2090
2091 list_add(&in->hashLink, &dev->objectBucket[bucket].list);
2092 dev->objectBucket[bucket].count++;
2093
2094 }
2095
2096 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
2097 {
2098 int bucket = yaffs_HashFunction(number);
2099 struct list_head *i;
2100 yaffs_Object *in;
2101
2102 list_for_each(i, &dev->objectBucket[bucket].list) {
2103 /* Look if it is in the list */
2104 if (i) {
2105 in = list_entry(i, yaffs_Object, hashLink);
2106 if (in->objectId == number) {
2107 #ifdef __KERNEL__
2108 /* Don't tell the VFS about this one if it is defered free */
2109 if (in->deferedFree)
2110 return NULL;
2111 #endif
2112
2113 return in;
2114 }
2115 }
2116 }
2117
2118 return NULL;
2119 }
2120
2121 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
2122 yaffs_ObjectType type)
2123 {
2124
2125 yaffs_Object *theObject;
2126 yaffs_Tnode *tn;
2127
2128 if (number < 0) {
2129 number = yaffs_CreateNewObjectNumber(dev);
2130 }
2131
2132 theObject = yaffs_AllocateEmptyObject(dev);
2133 if(!theObject)
2134 return NULL;
2135
2136 if(type == YAFFS_OBJECT_TYPE_FILE){
2137 tn = yaffs_GetTnode(dev);
2138 if(!tn){
2139 yaffs_FreeObject(theObject);
2140 return NULL;
2141 }
2142 }
2143
2144
2145
2146 if (theObject) {
2147 theObject->fake = 0;
2148 theObject->renameAllowed = 1;
2149 theObject->unlinkAllowed = 1;
2150 theObject->objectId = number;
2151 yaffs_HashObject(theObject);
2152 theObject->variantType = type;
2153 #ifdef CONFIG_YAFFS_WINCE
2154 yfsd_WinFileTimeNow(theObject->win_atime);
2155 theObject->win_ctime[0] = theObject->win_mtime[0] =
2156 theObject->win_atime[0];
2157 theObject->win_ctime[1] = theObject->win_mtime[1] =
2158 theObject->win_atime[1];
2159
2160 #else
2161
2162 theObject->yst_atime = theObject->yst_mtime =
2163 theObject->yst_ctime = Y_CURRENT_TIME;
2164 #endif
2165 switch (type) {
2166 case YAFFS_OBJECT_TYPE_FILE:
2167 theObject->variant.fileVariant.fileSize = 0;
2168 theObject->variant.fileVariant.scannedFileSize = 0;
2169 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2170 theObject->variant.fileVariant.topLevel = 0;
2171 theObject->variant.fileVariant.top = tn;
2172 break;
2173 case YAFFS_OBJECT_TYPE_DIRECTORY:
2174 INIT_LIST_HEAD(&theObject->variant.directoryVariant.
2175 children);
2176 break;
2177 case YAFFS_OBJECT_TYPE_SYMLINK:
2178 case YAFFS_OBJECT_TYPE_HARDLINK:
2179 case YAFFS_OBJECT_TYPE_SPECIAL:
2180 /* No action required */
2181 break;
2182 case YAFFS_OBJECT_TYPE_UNKNOWN:
2183 /* todo this should not happen */
2184 break;
2185 }
2186 }
2187
2188 return theObject;
2189 }
2190
2191 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
2192 int number,
2193 yaffs_ObjectType type)
2194 {
2195 yaffs_Object *theObject = NULL;
2196
2197 if (number > 0) {
2198 theObject = yaffs_FindObjectByNumber(dev, number);
2199 }
2200
2201 if (!theObject) {
2202 theObject = yaffs_CreateNewObject(dev, number, type);
2203 }
2204
2205 return theObject;
2206
2207 }
2208
2209
2210 static YCHAR *yaffs_CloneString(const YCHAR * str)
2211 {
2212 YCHAR *newStr = NULL;
2213
2214 if (str && *str) {
2215 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2216 if(newStr)
2217 yaffs_strcpy(newStr, str);
2218 }
2219
2220 return newStr;
2221
2222 }
2223
2224 /*
2225 * Mknod (create) a new object.
2226 * equivalentObject only has meaning for a hard link;
2227 * aliasString only has meaning for a sumlink.
2228 * rdev only has meaning for devices (a subset of special objects)
2229 */
2230
2231 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2232 yaffs_Object * parent,
2233 const YCHAR * name,
2234 __u32 mode,
2235 __u32 uid,
2236 __u32 gid,
2237 yaffs_Object * equivalentObject,
2238 const YCHAR * aliasString, __u32 rdev)
2239 {
2240 yaffs_Object *in;
2241 YCHAR *str;
2242
2243 yaffs_Device *dev = parent->myDev;
2244
2245 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2246 if (yaffs_FindObjectByName(parent, name)) {
2247 return NULL;
2248 }
2249
2250 in = yaffs_CreateNewObject(dev, -1, type);
2251
2252 if(type == YAFFS_OBJECT_TYPE_SYMLINK){
2253 str = yaffs_CloneString(aliasString);
2254 if(!str){
2255 yaffs_FreeObject(in);
2256 return NULL;
2257 }
2258 }
2259
2260
2261
2262 if (in) {
2263 in->chunkId = -1;
2264 in->valid = 1;
2265 in->variantType = type;
2266
2267 in->yst_mode = mode;
2268
2269 #ifdef CONFIG_YAFFS_WINCE
2270 yfsd_WinFileTimeNow(in->win_atime);
2271 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2272 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2273
2274 #else
2275 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2276
2277 in->yst_rdev = rdev;
2278 in->yst_uid = uid;
2279 in->yst_gid = gid;
2280 #endif
2281 in->nDataChunks = 0;
2282
2283 yaffs_SetObjectName(in, name);
2284 in->dirty = 1;
2285
2286 yaffs_AddObjectToDirectory(parent, in);
2287
2288 in->myDev = parent->myDev;
2289
2290 switch (type) {
2291 case YAFFS_OBJECT_TYPE_SYMLINK:
2292 in->variant.symLinkVariant.alias = str;
2293 break;
2294 case YAFFS_OBJECT_TYPE_HARDLINK:
2295 in->variant.hardLinkVariant.equivalentObject =
2296 equivalentObject;
2297 in->variant.hardLinkVariant.equivalentObjectId =
2298 equivalentObject->objectId;
2299 list_add(&in->hardLinks, &equivalentObject->hardLinks);
2300 break;
2301 case YAFFS_OBJECT_TYPE_FILE:
2302 case YAFFS_OBJECT_TYPE_DIRECTORY:
2303 case YAFFS_OBJECT_TYPE_SPECIAL:
2304 case YAFFS_OBJECT_TYPE_UNKNOWN:
2305 /* do nothing */
2306 break;
2307 }
2308
2309 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2310 /* Could not create the object header, fail the creation */
2311 yaffs_DestroyObject(in);
2312 in = NULL;
2313 }
2314
2315 }
2316
2317 return in;
2318 }
2319
2320 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
2321 __u32 mode, __u32 uid, __u32 gid)
2322 {
2323 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2324 uid, gid, NULL, NULL, 0);
2325 }
2326
2327 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
2328 __u32 mode, __u32 uid, __u32 gid)
2329 {
2330 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2331 mode, uid, gid, NULL, NULL, 0);
2332 }
2333
2334 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
2335 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2336 {
2337 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2338 uid, gid, NULL, NULL, rdev);
2339 }
2340
2341 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
2342 __u32 mode, __u32 uid, __u32 gid,
2343 const YCHAR * alias)
2344 {
2345 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2346 uid, gid, NULL, alias, 0);
2347 }
2348
2349 /* yaffs_Link returns the object id of the equivalent object.*/
2350 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
2351 yaffs_Object * equivalentObject)
2352 {
2353 /* Get the real object in case we were fed a hard link as an equivalent object */
2354 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2355
2356 if (yaffs_MknodObject
2357 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2358 equivalentObject, NULL, 0)) {
2359 return equivalentObject;
2360 } else {
2361 return NULL;
2362 }
2363
2364 }
2365
2366 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
2367 const YCHAR * newName, int force, int shadows)
2368 {
2369 int unlinkOp;
2370 int deleteOp;
2371
2372 yaffs_Object *existingTarget;
2373
2374 if (newDir == NULL) {
2375 newDir = obj->parent; /* use the old directory */
2376 }
2377
2378 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2379 T(YAFFS_TRACE_ALWAYS,
2380 (TSTR
2381 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
2382 TENDSTR)));
2383 YBUG();
2384 }
2385
2386 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2387 if (obj->myDev->isYaffs2) {
2388 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2389 } else {
2390 unlinkOp = (newDir == obj->myDev->unlinkedDir
2391 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2392 }
2393
2394 deleteOp = (newDir == obj->myDev->deletedDir);
2395
2396 existingTarget = yaffs_FindObjectByName(newDir, newName);
2397
2398 /* If the object is a file going into the unlinked directory,
2399 * then it is OK to just stuff it in since duplicate names are allowed.
2400 * else only proceed if the new name does not exist and if we're putting
2401 * it into a directory.
2402 */
2403 if ((unlinkOp ||
2404 deleteOp ||
2405 force ||
2406 (shadows > 0) ||
2407 !existingTarget) &&
2408 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2409 yaffs_SetObjectName(obj, newName);
2410 obj->dirty = 1;
2411
2412 yaffs_AddObjectToDirectory(newDir, obj);
2413
2414 if (unlinkOp)
2415 obj->unlinked = 1;
2416
2417 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2418 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
2419 return YAFFS_OK;
2420 }
2421
2422 return YAFFS_FAIL;
2423 }
2424
2425 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
2426 yaffs_Object * newDir, const YCHAR * newName)
2427 {
2428 yaffs_Object *obj;
2429 yaffs_Object *existingTarget;
2430 int force = 0;
2431
2432 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2433 /* Special case for case insemsitive systems (eg. WinCE).
2434 * While look-up is case insensitive, the name isn't.
2435 * Therefore we might want to change x.txt to X.txt
2436 */
2437 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
2438 force = 1;
2439 }
2440 #endif
2441
2442 obj = yaffs_FindObjectByName(oldDir, oldName);
2443 /* Check new name to long. */
2444 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
2445 yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
2446 /* ENAMETOOLONG */
2447 return YAFFS_FAIL;
2448 else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
2449 yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2450 /* ENAMETOOLONG */
2451 return YAFFS_FAIL;
2452
2453 if (obj && obj->renameAllowed) {
2454
2455 /* Now do the handling for an existing target, if there is one */
2456
2457 existingTarget = yaffs_FindObjectByName(newDir, newName);
2458 if (existingTarget &&
2459 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2460 !list_empty(&existingTarget->variant.directoryVariant.children)) {
2461 /* There is a target that is a non-empty directory, so we fail */
2462 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2463 } else if (existingTarget && existingTarget != obj) {
2464 /* Nuke the target first, using shadowing,
2465 * but only if it isn't the same object
2466 */
2467 yaffs_ChangeObjectName(obj, newDir, newName, force,
2468 existingTarget->objectId);
2469 yaffs_UnlinkObject(existingTarget);
2470 }
2471
2472 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2473 }
2474 return YAFFS_FAIL;
2475 }
2476
2477 /*------------------------- Block Management and Page Allocation ----------------*/
2478
2479 static int yaffs_InitialiseBlocks(yaffs_Device * dev)
2480 {
2481 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2482
2483 dev->blockInfo = NULL;
2484 dev->chunkBits = NULL;
2485
2486 dev->allocationBlock = -1; /* force it to get a new one */
2487
2488 /* If the first allocation strategy fails, thry the alternate one */
2489 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2490 if(!dev->blockInfo){
2491 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2492 dev->blockInfoAlt = 1;
2493 }
2494 else
2495 dev->blockInfoAlt = 0;
2496
2497 if(dev->blockInfo){
2498
2499 /* Set up dynamic blockinfo stuff. */
2500 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2501 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2502 if(!dev->chunkBits){
2503 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2504 dev->chunkBitsAlt = 1;
2505 }
2506 else
2507 dev->chunkBitsAlt = 0;
2508 }
2509
2510 if (dev->blockInfo && dev->chunkBits) {
2511 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2512 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2513 return YAFFS_OK;
2514 }
2515
2516 return YAFFS_FAIL;
2517
2518 }
2519
2520 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
2521 {
2522 if(dev->blockInfoAlt && dev->blockInfo)
2523 YFREE_ALT(dev->blockInfo);
2524 else if(dev->blockInfo)
2525 YFREE(dev->blockInfo);
2526
2527 dev->blockInfoAlt = 0;
2528
2529 dev->blockInfo = NULL;
2530
2531 if(dev->chunkBitsAlt && dev->chunkBits)
2532 YFREE_ALT(dev->chunkBits);
2533 else if(dev->chunkBits)
2534 YFREE(dev->chunkBits);
2535 dev->chunkBitsAlt = 0;
2536 dev->chunkBits = NULL;
2537 }
2538
2539 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
2540 yaffs_BlockInfo * bi)
2541 {
2542 int i;
2543 __u32 seq;
2544 yaffs_BlockInfo *b;
2545
2546 if (!dev->isYaffs2)
2547 return 1; /* disqualification only applies to yaffs2. */
2548
2549 if (!bi->hasShrinkHeader)
2550 return 1; /* can gc */
2551
2552 /* Find the oldest dirty sequence number if we don't know it and save it
2553 * so we don't have to keep recomputing it.
2554 */
2555 if (!dev->oldestDirtySequence) {
2556 seq = dev->sequenceNumber;
2557
2558 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2559 i++) {
2560 b = yaffs_GetBlockInfo(dev, i);
2561 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2562 (b->pagesInUse - b->softDeletions) <
2563 dev->nChunksPerBlock && b->sequenceNumber < seq) {
2564 seq = b->sequenceNumber;
2565 }
2566 }
2567 dev->oldestDirtySequence = seq;
2568 }
2569
2570 /* Can't do gc of this block if there are any blocks older than this one that have
2571 * discarded pages.
2572 */
2573 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2574
2575 }
2576
2577 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2578 * for garbage collection.
2579 */
2580
2581 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
2582 int aggressive)
2583 {
2584
2585 int b = dev->currentDirtyChecker;
2586
2587 int i;
2588 int iterations;
2589 int dirtiest = -1;
2590 int pagesInUse = 0;
2591 int prioritised=0;
2592 yaffs_BlockInfo *bi;
2593 int pendingPrioritisedExist = 0;
2594
2595 /* First let's see if we need to grab a prioritised block */
2596 if(dev->hasPendingPrioritisedGCs){
2597 for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
2598
2599 bi = yaffs_GetBlockInfo(dev, i);
2600 //yaffs_VerifyBlock(dev,bi,i);
2601
2602 if(bi->gcPrioritise) {
2603 pendingPrioritisedExist = 1;
2604 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2605 yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
2606 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2607 dirtiest = i;
2608 prioritised = 1;
2609 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2610 }
2611 }
2612 }
2613
2614 if(!pendingPrioritisedExist) /* None found, so we can clear this */
2615 dev->hasPendingPrioritisedGCs = 0;
2616 }
2617
2618 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2619 * search harder.
2620 * else (we're doing a leasurely gc), then we only bother to do this if the
2621 * block has only a few pages in use.
2622 */
2623
2624 dev->nonAggressiveSkip--;
2625
2626 if (!aggressive && (dev->nonAggressiveSkip > 0)) {
2627 return -1;
2628 }
2629
2630 if(!prioritised)
2631 pagesInUse =
2632 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2633
2634 if (aggressive) {
2635 iterations =
2636 dev->internalEndBlock - dev->internalStartBlock + 1;
2637 } else {
2638 iterations =
2639 dev->internalEndBlock - dev->internalStartBlock + 1;
2640 iterations = iterations / 16;
2641 if (iterations > 200) {
2642 iterations = 200;
2643 }
2644 }
2645
2646 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2647 b++;
2648 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2649 b = dev->internalStartBlock;
2650 }
2651
2652 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2653 T(YAFFS_TRACE_ERROR,
2654 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2655 YBUG();
2656 }
2657
2658 bi = yaffs_GetBlockInfo(dev, b);
2659
2660 #if 0
2661 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
2662 dirtiest = b;
2663 pagesInUse = 0;
2664 }
2665 else
2666 #endif
2667
2668 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2669 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2670 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2671 dirtiest = b;
2672 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2673 }
2674 }
2675
2676 dev->currentDirtyChecker = b;
2677
2678 if (dirtiest > 0) {
2679 T(YAFFS_TRACE_GC,
2680 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2681 dev->nChunksPerBlock - pagesInUse,prioritised));
2682 }
2683
2684 dev->oldestDirtySequence = 0;
2685
2686 if (dirtiest > 0) {
2687 dev->nonAggressiveSkip = 4;
2688 }
2689
2690 return dirtiest;
2691 }
2692
2693 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
2694 {
2695 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2696
2697 int erasedOk = 0;
2698
2699 /* If the block is still healthy erase it and mark as clean.
2700 * If the block has had a data failure, then retire it.
2701 */
2702
2703 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2704 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2705 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2706
2707 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2708
2709 if (!bi->needsRetiring) {
2710 yaffs_InvalidateCheckpoint(dev);
2711 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2712 if (!erasedOk) {
2713 dev->nErasureFailures++;
2714 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2715 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2716 }
2717 }
2718
2719 if (erasedOk &&
2720 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2721 int i;
2722 for (i = 0; i < dev->nChunksPerBlock; i++) {
2723 if (!yaffs_CheckChunkErased
2724 (dev, blockNo * dev->nChunksPerBlock + i)) {
2725 T(YAFFS_TRACE_ERROR,
2726 (TSTR
2727 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2728 TENDSTR), blockNo, i));
2729 }
2730 }
2731 }
2732
2733 if (erasedOk) {
2734 /* Clean it up... */
2735 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2736 dev->nErasedBlocks++;
2737 bi->pagesInUse = 0;
2738 bi->softDeletions = 0;
2739 bi->hasShrinkHeader = 0;
2740 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2741 bi->gcPrioritise = 0;
2742 yaffs_ClearChunkBits(dev, blockNo);
2743
2744 T(YAFFS_TRACE_ERASE,
2745 (TSTR("Erased block %d" TENDSTR), blockNo));
2746 } else {
2747 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
2748
2749 yaffs_RetireBlock(dev, blockNo);
2750 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2751 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2752 }
2753 }
2754
2755 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2756 {
2757 int i;
2758
2759 yaffs_BlockInfo *bi;
2760
2761 if (dev->nErasedBlocks < 1) {
2762 /* Hoosterman we've got a problem.
2763 * Can't get space to gc
2764 */
2765 T(YAFFS_TRACE_ERROR,
2766 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2767
2768 return -1;
2769 }
2770
2771 /* Find an empty block. */
2772
2773 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2774 dev->allocationBlockFinder++;
2775 if (dev->allocationBlockFinder < dev->internalStartBlock
2776 || dev->allocationBlockFinder > dev->internalEndBlock) {
2777 dev->allocationBlockFinder = dev->internalStartBlock;
2778 }
2779
2780 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2781
2782 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2783 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2784 dev->sequenceNumber++;
2785 bi->sequenceNumber = dev->sequenceNumber;
2786 dev->nErasedBlocks--;
2787 T(YAFFS_TRACE_ALLOCATE,
2788 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2789 dev->allocationBlockFinder, dev->sequenceNumber,
2790 dev->nErasedBlocks));
2791 return dev->allocationBlockFinder;
2792 }
2793 }
2794
2795 T(YAFFS_TRACE_ALWAYS,
2796 (TSTR
2797 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2798 TENDSTR), dev->nErasedBlocks));
2799
2800 return -1;
2801 }
2802
2803
2804 // Check if there's space to allocate...
2805 // Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2806 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2807 {
2808 int reservedChunks;
2809 int reservedBlocks = dev->nReservedBlocks;
2810 int checkpointBlocks;
2811
2812 checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
2813 if(checkpointBlocks < 0)
2814 checkpointBlocks = 0;
2815
2816 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2817
2818 return (dev->nFreeChunks > reservedChunks);
2819 }
2820
2821 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
2822 {
2823 int retVal;
2824 yaffs_BlockInfo *bi;
2825
2826 if (dev->allocationBlock < 0) {
2827 /* Get next block to allocate off */
2828 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2829 dev->allocationPage = 0;
2830 }
2831
2832 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2833 /* Not enough space to allocate unless we're allowed to use the reserve. */
2834 return -1;
2835 }
2836
2837 if (dev->nErasedBlocks < dev->nReservedBlocks
2838 && dev->allocationPage == 0) {
2839 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2840 }
2841
2842 /* Next page please.... */
2843 if (dev->allocationBlock >= 0) {
2844 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2845
2846 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2847 dev->allocationPage;
2848 bi->pagesInUse++;
2849 yaffs_SetChunkBit(dev, dev->allocationBlock,
2850 dev->allocationPage);
2851
2852 dev->allocationPage++;
2853
2854 dev->nFreeChunks--;
2855
2856 /* If the block is full set the state to full */
2857 if (dev->allocationPage >= dev->nChunksPerBlock) {
2858 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2859 dev->allocationBlock = -1;
2860 }
2861
2862 if(blockUsedPtr)
2863 *blockUsedPtr = bi;
2864
2865 return retVal;
2866 }
2867
2868 T(YAFFS_TRACE_ERROR,
2869 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2870
2871 return -1;
2872 }
2873
2874 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2875 {
2876 int n;
2877
2878 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2879
2880 if (dev->allocationBlock > 0) {
2881 n += (dev->nChunksPerBlock - dev->allocationPage);
2882 }
2883
2884 return n;
2885
2886 }
2887
2888 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2889 {
2890 int oldChunk;
2891 int newChunk;
2892 int chunkInBlock;
2893 int markNAND;
2894 int retVal = YAFFS_OK;
2895 int cleanups = 0;
2896 int i;
2897 int isCheckpointBlock;
2898 int matchingChunk;
2899
2900 int chunksBefore = yaffs_GetErasedChunks(dev);
2901 int chunksAfter;
2902
2903 yaffs_ExtendedTags tags;
2904
2905 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2906
2907 yaffs_Object *object;
2908
2909 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2910
2911 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2912
2913 T(YAFFS_TRACE_TRACING,
2914 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2915 bi->pagesInUse, bi->hasShrinkHeader));
2916
2917 /*yaffs_VerifyFreeChunks(dev); */
2918
2919 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2920
2921 /* Take off the number of soft deleted entries because
2922 * they're going to get really deleted during GC.
2923 */
2924 dev->nFreeChunks -= bi->softDeletions;
2925
2926 dev->isDoingGC = 1;
2927
2928 if (isCheckpointBlock ||
2929 !yaffs_StillSomeChunkBits(dev, block)) {
2930 T(YAFFS_TRACE_TRACING,
2931 (TSTR
2932 ("Collecting block %d that has no chunks in use" TENDSTR),
2933 block));
2934 yaffs_BlockBecameDirty(dev, block);
2935 } else {
2936
2937 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2938
2939 yaffs_VerifyBlock(dev,bi,block);
2940
2941 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2942 chunkInBlock < dev->nChunksPerBlock
2943 && yaffs_StillSomeChunkBits(dev, block);
2944 chunkInBlock++, oldChunk++) {
2945 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2946
2947 /* This page is in use and might need to be copied off */
2948
2949 markNAND = 1;
2950
2951 yaffs_InitialiseTags(&tags);
2952
2953 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2954 buffer, &tags);
2955
2956 object =
2957 yaffs_FindObjectByNumber(dev,
2958 tags.objectId);
2959
2960 T(YAFFS_TRACE_GC_DETAIL,
2961 (TSTR
2962 ("Collecting page %d, %d %d %d " TENDSTR),
2963 chunkInBlock, tags.objectId, tags.chunkId,
2964 tags.byteCount));
2965
2966 if(object && !yaffs_SkipVerification(dev)){
2967 if(tags.chunkId == 0)
2968 matchingChunk = object->chunkId;
2969 else if(object->softDeleted)
2970 matchingChunk = oldChunk; /* Defeat the test */
2971 else
2972 matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
2973
2974 if(oldChunk != matchingChunk)
2975 T(YAFFS_TRACE_ERROR,
2976 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2977 oldChunk,matchingChunk,tags.objectId, tags.chunkId));
2978
2979 }
2980
2981 if (!object) {
2982 T(YAFFS_TRACE_ERROR,
2983 (TSTR
2984 ("page %d in gc has no object: %d %d %d "
2985 TENDSTR), oldChunk,
2986 tags.objectId, tags.chunkId, tags.byteCount));
2987 }
2988
2989 if (object && object->deleted
2990 && tags.chunkId != 0) {
2991 /* Data chunk in a deleted file, throw it away
2992 * It's a soft deleted data chunk,
2993 * No need to copy this, just forget about it and
2994 * fix up the object.
2995 */
2996
2997 object->nDataChunks--;
2998
2999 if (object->nDataChunks <= 0) {
3000 /* remeber to clean up the object */
3001 dev->gcCleanupList[cleanups] =
3002 tags.objectId;
3003 cleanups++;
3004 }
3005 markNAND = 0;
3006 } else if (0
3007 /* Todo object && object->deleted && object->nDataChunks == 0 */
3008 ) {
3009 /* Deleted object header with no data chunks.
3010 * Can be discarded and the file deleted.
3011 */
3012 object->chunkId = 0;
3013 yaffs_FreeTnode(object->myDev,
3014 object->variant.
3015 fileVariant.top);
3016 object->variant.fileVariant.top = NULL;
3017 yaffs_DoGenericObjectDeletion(object);
3018
3019 } else if (object) {
3020 /* It's either a data chunk in a live file or
3021 * an ObjectHeader, so we're interested in it.
3022 * NB Need to keep the ObjectHeaders of deleted files
3023 * until the whole file has been deleted off
3024 */
3025 tags.serialNumber++;
3026
3027 dev->nGCCopies++;
3028
3029 if (tags.chunkId == 0) {
3030 /* It is an object Id,
3031 * We need to nuke the shrinkheader flags first
3032 * We no longer want the shrinkHeader flag since its work is done
3033 * and if it is left in place it will mess up scanning.
3034 * Also, clear out any shadowing stuff
3035 */
3036
3037 yaffs_ObjectHeader *oh;
3038 oh = (yaffs_ObjectHeader *)buffer;
3039 oh->isShrink = 0;
3040 oh->shadowsObject = -1;
3041 tags.extraShadows = 0;
3042 tags.extraIsShrinkHeader = 0;
3043
3044 yaffs_VerifyObjectHeader(object,oh,&tags,1);
3045 }
3046
3047 newChunk =
3048 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3049
3050 if (newChunk < 0) {
3051 retVal = YAFFS_FAIL;
3052 } else {
3053
3054 /* Ok, now fix up the Tnodes etc. */
3055
3056 if (tags.chunkId == 0) {
3057 /* It's a header */
3058 object->chunkId = newChunk;
3059 object->serial = tags.serialNumber;
3060 } else {
3061 /* It's a data chunk */
3062 yaffs_PutChunkIntoFile
3063 (object,
3064 tags.chunkId,
3065 newChunk, 0);
3066 }
3067 }
3068 }
3069
3070 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3071
3072 }
3073 }
3074
3075 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3076
3077
3078 /* Do any required cleanups */
3079 for (i = 0; i < cleanups; i++) {
3080 /* Time to delete the file too */
3081 object =
3082 yaffs_FindObjectByNumber(dev,
3083 dev->gcCleanupList[i]);
3084 if (object) {
3085 yaffs_FreeTnode(dev,
3086 object->variant.fileVariant.
3087 top);
3088 object->variant.fileVariant.top = NULL;
3089 T(YAFFS_TRACE_GC,
3090 (TSTR
3091 ("yaffs: About to finally delete object %d"
3092 TENDSTR), object->objectId));
3093 yaffs_DoGenericObjectDeletion(object);
3094 object->myDev->nDeletedFiles--;
3095 }
3096
3097 }
3098
3099 }
3100
3101 yaffs_VerifyCollectedBlock(dev,bi,block);
3102
3103 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
3104 T(YAFFS_TRACE_GC,
3105 (TSTR
3106 ("gc did not increase free chunks before %d after %d"
3107 TENDSTR), chunksBefore, chunksAfter));
3108 }
3109
3110 dev->isDoingGC = 0;
3111
3112 return YAFFS_OK;
3113 }
3114
3115 /* New garbage collector
3116 * If we're very low on erased blocks then we do aggressive garbage collection
3117 * otherwise we do "leasurely" garbage collection.
3118 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3119 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3120 *
3121 * The idea is to help clear out space in a more spread-out manner.
3122 * Dunno if it really does anything useful.
3123 */
3124 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
3125 {
3126 int block;
3127 int aggressive;
3128 int gcOk = YAFFS_OK;
3129 int maxTries = 0;
3130
3131 int checkpointBlockAdjust;
3132
3133 if (dev->isDoingGC) {
3134 /* Bail out so we don't get recursive gc */
3135 return YAFFS_OK;
3136 }
3137
3138 /* This loop should pass the first time.
3139 * We'll only see looping here if the erase of the collected block fails.
3140 */
3141
3142 do {
3143 maxTries++;
3144
3145 checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
3146 if(checkpointBlockAdjust < 0)
3147 checkpointBlockAdjust = 0;
3148
3149 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3150 /* We need a block soon...*/
3151 aggressive = 1;
3152 } else {
3153 /* We're in no hurry */
3154 aggressive = 0;
3155 }
3156
3157 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3158
3159 if (block > 0) {
3160 dev->garbageCollections++;
3161 if (!aggressive) {
3162 dev->passiveGarbageCollections++;
3163 }
3164
3165 T(YAFFS_TRACE_GC,
3166 (TSTR
3167 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3168 dev->nErasedBlocks, aggressive));
3169
3170 gcOk = yaffs_GarbageCollectBlock(dev, block);
3171 }
3172
3173 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3174 T(YAFFS_TRACE_GC,
3175 (TSTR
3176 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3177 TENDSTR), dev->nErasedBlocks, maxTries, block));
3178 }
3179 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
3180 && (maxTries < 2));
3181
3182 return aggressive ? gcOk : YAFFS_OK;
3183 }
3184
3185 /*------------------------- TAGS --------------------------------*/
3186
3187 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
3188 int chunkInObject)
3189 {
3190 return (tags->chunkId == chunkInObject &&
3191 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3192
3193 }
3194
3195
3196 /*-------------------- Data file manipulation -----------------*/
3197
3198 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
3199 yaffs_ExtendedTags * tags)
3200 {
3201 /*Get the Tnode, then get the level 0 offset chunk offset */
3202 yaffs_Tnode *tn;
3203 int theChunk = -1;
3204 yaffs_ExtendedTags localTags;
3205 int retVal = -1;
3206
3207 yaffs_Device *dev = in->myDev;
3208
3209 if (!tags) {
3210 /* Passed a NULL, so use our own tags space */
3211 tags = &localTags;
3212 }
3213
3214 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3215
3216 if (tn) {
3217 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3218
3219 retVal =
3220 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3221 chunkInInode);
3222 }
3223 return retVal;
3224 }
3225
3226 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
3227 yaffs_ExtendedTags * tags)
3228 {
3229 /* Get the Tnode, then get the level 0 offset chunk offset */
3230 yaffs_Tnode *tn;
3231 int theChunk = -1;
3232 yaffs_ExtendedTags localTags;
3233
3234 yaffs_Device *dev = in->myDev;
3235 int retVal = -1;
3236
3237 if (!tags) {
3238 /* Passed a NULL, so use our own tags space */
3239 tags = &localTags;
3240 }
3241
3242 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3243
3244 if (tn) {
3245
3246 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3247
3248 retVal =
3249 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3250 chunkInInode);
3251
3252 /* Delete the entry in the filestructure (if found) */
3253 if (retVal != -1) {
3254 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
3255 }
3256 } else {
3257 /*T(("No level 0 found for %d\n", chunkInInode)); */
3258 }
3259
3260 if (retVal == -1) {
3261 /* T(("Could not find %d to delete\n",chunkInInode)); */
3262 }
3263 return retVal;
3264 }
3265
3266 #ifdef YAFFS_PARANOID
3267
3268 static int yaffs_CheckFileSanity(yaffs_Object * in)
3269 {
3270 int chunk;
3271 int nChunks;
3272 int fSize;
3273 int failed = 0;
3274 int objId;
3275 yaffs_Tnode *tn;
3276 yaffs_Tags localTags;
3277 yaffs_Tags *tags = &localTags;
3278 int theChunk;
3279 int chunkDeleted;
3280
3281 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3282 /* T(("Object not a file\n")); */
3283 return YAFFS_FAIL;
3284 }
3285
3286 objId = in->objectId;
3287 fSize = in->variant.fileVariant.fileSize;
3288 nChunks =
3289 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3290
3291 for (chunk = 1; chunk <= nChunks; chunk++) {
3292 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3293 chunk);
3294
3295 if (tn) {
3296
3297 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
3298
3299 if (yaffs_CheckChunkBits
3300 (dev, theChunk / dev->nChunksPerBlock,
3301 theChunk % dev->nChunksPerBlock)) {
3302
3303 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3304 tags,
3305 &chunkDeleted);
3306 if (yaffs_TagsMatch
3307 (tags, in->objectId, chunk, chunkDeleted)) {
3308 /* found it; */
3309
3310 }
3311 } else {
3312
3313 failed = 1;
3314 }
3315
3316 } else {
3317 /* T(("No level 0 found for %d\n", chunk)); */
3318 }
3319 }
3320
3321 return failed ? YAFFS_FAIL : YAFFS_OK;
3322 }
3323
3324 #endif
3325
3326 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
3327 int chunkInNAND, int inScan)
3328 {
3329 /* NB inScan is zero unless scanning.
3330 * For forward scanning, inScan is > 0;
3331 * for backward scanning inScan is < 0
3332 */
3333
3334 yaffs_Tnode *tn;
3335 yaffs_Device *dev = in->myDev;
3336 int existingChunk;
3337 yaffs_ExtendedTags existingTags;
3338 yaffs_ExtendedTags newTags;
3339 unsigned existingSerial, newSerial;
3340
3341 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3342 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3343 * If it is not during Scanning then something went wrong!
3344 */
3345 if (!inScan) {
3346 T(YAFFS_TRACE_ERROR,
3347 (TSTR
3348 ("yaffs tragedy:attempt to put data chunk into a non-file"
3349 TENDSTR)));
3350 YBUG();
3351 }
3352
3353 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3354 return YAFFS_OK;
3355 }
3356
3357 tn = yaffs_AddOrFindLevel0Tnode(dev,
3358 &in->variant.fileVariant,
3359 chunkInInode,
3360 NULL);
3361 if (!tn) {
3362 return YAFFS_FAIL;
3363 }
3364
3365 existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3366
3367 if (inScan != 0) {
3368 /* If we're scanning then we need to test for duplicates
3369 * NB This does not need to be efficient since it should only ever
3370 * happen when the power fails during a write, then only one
3371 * chunk should ever be affected.
3372 *
3373 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3374 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3375 */
3376
3377 if (existingChunk != 0) {
3378 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3379 * thus we have to do a FindChunkInFile to get the real chunk id.
3380 *
3381 * We have a duplicate now we need to decide which one to use:
3382 *
3383 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3384 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3385 * YAFFS1: Get both sets of tags and compare serial numbers.
3386 */
3387
3388 if (inScan > 0) {
3389 /* Only do this for forward scanning */
3390 yaffs_ReadChunkWithTagsFromNAND(dev,
3391 chunkInNAND,
3392 NULL, &newTags);
3393
3394 /* Do a proper find */
3395 existingChunk =
3396 yaffs_FindChunkInFile(in, chunkInInode,
3397 &existingTags);
3398 }
3399
3400 if (existingChunk <= 0) {
3401 /*Hoosterman - how did this happen? */
3402
3403 T(YAFFS_TRACE_ERROR,
3404 (TSTR
3405 ("yaffs tragedy: existing chunk < 0 in scan"
3406 TENDSTR)));
3407
3408 }
3409
3410 /* NB The deleted flags should be false, otherwise the chunks will
3411 * not be loaded during a scan
3412 */
3413
3414 newSerial = newTags.serialNumber;
3415 existingSerial = existingTags.serialNumber;
3416
3417 if ((inScan > 0) &&
3418 (in->myDev->isYaffs2 ||
3419 existingChunk <= 0 ||
3420 ((existingSerial + 1) & 3) == newSerial)) {
3421 /* Forward scanning.
3422 * Use new
3423 * Delete the old one and drop through to update the tnode
3424 */
3425 yaffs_DeleteChunk(dev, existingChunk, 1,
3426 __LINE__);
3427 } else {
3428 /* Backward scanning or we want to use the existing one
3429 * Use existing.
3430 * Delete the new one and return early so that the tnode isn't changed
3431 */
3432 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3433 __LINE__);
3434 return YAFFS_OK;
3435 }
3436 }
3437
3438 }
3439
3440 if (existingChunk == 0) {
3441 in->nDataChunks++;
3442 }
3443
3444 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
3445
3446 return YAFFS_OK;
3447 }
3448
3449 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
3450 __u8 * buffer)
3451 {
3452 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3453
3454 if (chunkInNAND >= 0) {
3455 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3456 buffer,NULL);
3457 } else {
3458 T(YAFFS_TRACE_NANDACCESS,
3459 (TSTR("Chunk %d not found zero instead" TENDSTR),
3460 chunkInNAND));
3461 /* get sane (zero) data if you read a hole */
3462 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3463 return 0;
3464 }
3465
3466 }
3467
3468 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
3469 {
3470 int block;
3471 int page;
3472 yaffs_ExtendedTags tags;
3473 yaffs_BlockInfo *bi;
3474
3475 if (chunkId <= 0)
3476 return;
3477
3478
3479 dev->nDeletions++;
3480 block = chunkId / dev->nChunksPerBlock;
3481 page = chunkId % dev->nChunksPerBlock;
3482
3483
3484 if(!yaffs_CheckChunkBit(dev,block,page))
3485 T(YAFFS_TRACE_VERIFY,
3486 (TSTR("Deleting invalid chunk %d"TENDSTR),
3487 chunkId));
3488
3489 bi = yaffs_GetBlockInfo(dev, block);
3490
3491 T(YAFFS_TRACE_DELETION,
3492 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3493
3494 if (markNAND &&
3495 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3496
3497 yaffs_InitialiseTags(&tags);
3498
3499 tags.chunkDeleted = 1;
3500
3501 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3502 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3503 } else {
3504 dev->nUnmarkedDeletions++;
3505 }
3506
3507 /* Pull out of the management area.
3508 * If the whole block became dirty, this will kick off an erasure.
3509 */
3510 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3511 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3512 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3513 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3514 dev->nFreeChunks++;
3515
3516 yaffs_ClearChunkBit(dev, block, page);
3517
3518 bi->pagesInUse--;
3519
3520 if (bi->pagesInUse == 0 &&
3521 !bi->hasShrinkHeader &&
3522 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3523 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3524 yaffs_BlockBecameDirty(dev, block);
3525 }
3526
3527 } else {
3528 /* T(("Bad news deleting chunk %d\n",chunkId)); */
3529 }
3530
3531 }
3532
3533 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
3534 const __u8 * buffer, int nBytes,
3535 int useReserve)
3536 {
3537 /* Find old chunk Need to do this to get serial number
3538 * Write new one and patch into tree.
3539 * Invalidate old tags.
3540 */
3541
3542 int prevChunkId;
3543 yaffs_ExtendedTags prevTags;
3544
3545 int newChunkId;
3546 yaffs_ExtendedTags newTags;
3547
3548 yaffs_Device *dev = in->myDev;
3549
3550 yaffs_CheckGarbageCollection(dev);
3551
3552 /* Get the previous chunk at this location in the file if it exists */
3553 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3554
3555 /* Set up new tags */
3556 yaffs_InitialiseTags(&newTags);
3557
3558 newTags.chunkId = chunkInInode;
3559 newTags.objectId = in->objectId;
3560 newTags.serialNumber =
3561 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3562 newTags.byteCount = nBytes;
3563
3564 newChunkId =
3565 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3566 useReserve);
3567
3568 if (newChunkId >= 0) {
3569 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3570
3571 if (prevChunkId >= 0) {
3572 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3573
3574 }
3575
3576 yaffs_CheckFileSanity(in);
3577 }
3578 return newChunkId;
3579
3580 }
3581
3582 /* UpdateObjectHeader updates the header on NAND for an object.
3583 * If name is not NULL, then that new name is used.
3584 */
3585 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
3586 int isShrink, int shadows)
3587 {
3588
3589 yaffs_BlockInfo *bi;
3590
3591 yaffs_Device *dev = in->myDev;
3592
3593 int prevChunkId;
3594 int retVal = 0;
3595 int result = 0;
3596
3597 int newChunkId;
3598 yaffs_ExtendedTags newTags;
3599 yaffs_ExtendedTags oldTags;
3600
3601 __u8 *buffer = NULL;
3602 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3603
3604 yaffs_ObjectHeader *oh = NULL;
3605
3606 yaffs_strcpy(oldName,"silly old name");
3607
3608 if (!in->fake || force) {
3609
3610 yaffs_CheckGarbageCollection(dev);
3611 yaffs_CheckObjectDetailsLoaded(in);
3612
3613 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3614 oh = (yaffs_ObjectHeader *) buffer;
3615
3616 prevChunkId = in->chunkId;
3617
3618 if (prevChunkId >= 0) {
3619 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3620 buffer, &oldTags);
3621
3622 yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
3623
3624 memcpy(oldName, oh->name, sizeof(oh->name));
3625 }
3626
3627 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3628
3629 oh->type = in->variantType;
3630 oh->yst_mode = in->yst_mode;
3631 oh->shadowsObject = shadows;
3632
3633 #ifdef CONFIG_YAFFS_WINCE
3634 oh->win_atime[0] = in->win_atime[0];
3635 oh->win_ctime[0] = in->win_ctime[0];
3636 oh->win_mtime[0] = in->win_mtime[0];
3637 oh->win_atime[1] = in->win_atime[1];
3638 oh->win_ctime[1] = in->win_ctime[1];
3639 oh->win_mtime[1] = in->win_mtime[1];
3640 #else
3641 oh->yst_uid = in->yst_uid;
3642 oh->yst_gid = in->yst_gid;
3643 oh->yst_atime = in->yst_atime;
3644 oh->yst_mtime = in->yst_mtime;
3645 oh->yst_ctime = in->yst_ctime;
3646 oh->yst_rdev = in->yst_rdev;
3647 #endif
3648 if (in->parent) {
3649 oh->parentObjectId = in->parent->objectId;
3650 } else {
3651 oh->parentObjectId = 0;
3652 }
3653
3654 if (name && *name) {
3655 memset(oh->name, 0, sizeof(oh->name));
3656 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3657 } else if (prevChunkId>=0) {
3658 memcpy(oh->name, oldName, sizeof(oh->name));
3659 } else {
3660 memset(oh->name, 0, sizeof(oh->name));
3661 }
3662
3663 oh->isShrink = isShrink;
3664
3665 switch (in->variantType) {
3666 case YAFFS_OBJECT_TYPE_UNKNOWN:
3667 /* Should not happen */
3668 break;
3669 case YAFFS_OBJECT_TYPE_FILE:
3670 oh->fileSize =
3671 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3672 || oh->parentObjectId ==
3673 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3674 fileVariant.fileSize;
3675 break;
3676 case YAFFS_OBJECT_TYPE_HARDLINK:
3677 oh->equivalentObjectId =
3678 in->variant.hardLinkVariant.equivalentObjectId;
3679 break;
3680 case YAFFS_OBJECT_TYPE_SPECIAL:
3681 /* Do nothing */
3682 break;
3683 case YAFFS_OBJECT_TYPE_DIRECTORY:
3684 /* Do nothing */
3685 break;
3686 case YAFFS_OBJECT_TYPE_SYMLINK:
3687 yaffs_strncpy(oh->alias,
3688 in->variant.symLinkVariant.alias,
3689 YAFFS_MAX_ALIAS_LENGTH);
3690 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3691 break;
3692 }
3693
3694 /* Tags */
3695 yaffs_InitialiseTags(&newTags);
3696 in->serial++;
3697 newTags.chunkId = 0;
3698 newTags.objectId = in->objectId;
3699 newTags.serialNumber = in->serial;
3700
3701 /* Add extra info for file header */
3702
3703 newTags.extraHeaderInfoAvailable = 1;
3704 newTags.extraParentObjectId = oh->parentObjectId;
3705 newTags.extraFileLength = oh->fileSize;
3706 newTags.extraIsShrinkHeader = oh->isShrink;
3707 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3708 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3709 newTags.extraObjectType = in->variantType;
3710
3711 yaffs_VerifyObjectHeader(in,oh,&newTags,1);
3712
3713 /* Create new chunk in NAND */
3714 newChunkId =
3715 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3716 (prevChunkId >= 0) ? 1 : 0);
3717
3718 if (newChunkId >= 0) {
3719
3720 in->chunkId = newChunkId;
3721
3722 if (prevChunkId >= 0) {
3723 yaffs_DeleteChunk(dev, prevChunkId, 1,
3724 __LINE__);
3725 }
3726
3727 if(!yaffs_ObjectHasCachedWriteData(in))
3728 in->dirty = 0;
3729
3730 /* If this was a shrink, then mark the block that the chunk lives on */
3731 if (isShrink) {
3732 bi = yaffs_GetBlockInfo(in->myDev,
3733 newChunkId /in->myDev-> nChunksPerBlock);
3734 bi->hasShrinkHeader = 1;
3735 }
3736
3737 }
3738
3739 retVal = newChunkId;
3740
3741 }
3742
3743 if (buffer)
3744 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3745
3746 return retVal;
3747 }
3748
3749 /*------------------------ Short Operations Cache ----------------------------------------
3750 * In many situations where there is no high level buffering (eg WinCE) a lot of
3751 * reads might be short sequential reads, and a lot of writes may be short
3752 * sequential writes. eg. scanning/writing a jpeg file.
3753 * In these cases, a short read/write cache can provide a huge perfomance benefit
3754 * with dumb-as-a-rock code.
3755 * In Linux, the page cache provides read buffering aand the short op cache provides write
3756 * buffering.
3757 *
3758 * There are a limited number (~10) of cache chunks per device so that we don't
3759 * need a very intelligent search.
3760 */
3761
3762 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3763 {
3764 yaffs_Device *dev = obj->myDev;
3765 int i;
3766 yaffs_ChunkCache *cache;
3767 int nCaches = obj->myDev->nShortOpCaches;
3768
3769 for(i = 0; i < nCaches; i++){
3770 cache = &dev->srCache[i];
3771 if (cache->object == obj &&
3772 cache->dirty)
3773 return 1;
3774 }
3775
3776 return 0;
3777 }
3778
3779
3780 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
3781 {
3782 yaffs_Device *dev = obj->myDev;
3783 int lowest = -99; /* Stop compiler whining. */
3784 int i;
3785 yaffs_ChunkCache *cache;
3786 int chunkWritten = 0;
3787 int nCaches = obj->myDev->nShortOpCaches;
3788
3789 if (nCaches > 0) {
3790 do {
3791 cache = NULL;
3792
3793 /* Find the dirty cache for this object with the lowest chunk id. */
3794 for (i = 0; i < nCaches; i++) {
3795 if (dev->srCache[i].object == obj &&
3796 dev->srCache[i].dirty) {
3797 if (!cache
3798 || dev->srCache[i].chunkId <
3799 lowest) {
3800 cache = &dev->srCache[i];
3801 lowest = cache->chunkId;
3802 }
3803 }
3804 }
3805
3806 if (cache && !cache->locked) {
3807 /* Write it out and free it up */
3808
3809 chunkWritten =
3810 yaffs_WriteChunkDataToObject(cache->object,
3811 cache->chunkId,
3812 cache->data,
3813 cache->nBytes,
3814 1);
3815 cache->dirty = 0;
3816 cache->object = NULL;
3817 }
3818
3819 } while (cache && chunkWritten > 0);
3820
3821 if (cache) {
3822 /* Hoosterman, disk full while writing cache out. */
3823 T(YAFFS_TRACE_ERROR,
3824 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3825
3826 }
3827 }
3828
3829 }
3830
3831 /*yaffs_FlushEntireDeviceCache(dev)
3832 *
3833 *
3834 */
3835
3836 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3837 {
3838 yaffs_Object *obj;
3839 int nCaches = dev->nShortOpCaches;
3840 int i;
3841
3842 /* Find a dirty object in the cache and flush it...
3843 * until there are no further dirty objects.
3844 */
3845 do {
3846 obj = NULL;
3847 for( i = 0; i < nCaches && !obj; i++) {
3848 if (dev->srCache[i].object &&
3849 dev->srCache[i].dirty)
3850 obj = dev->srCache[i].object;
3851
3852 }
3853 if(obj)
3854 yaffs_FlushFilesChunkCache(obj);
3855
3856 } while(obj);
3857
3858 }
3859
3860
3861 /* Grab us a cache chunk for use.
3862 * First look for an empty one.
3863 * Then look for the least recently used non-dirty one.
3864 * Then look for the least recently used dirty one...., flush and look again.
3865 */
3866 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3867 {
3868 int i;
3869 int usage;
3870 int theOne;
3871
3872 if (dev->nShortOpCaches > 0) {
3873 for (i = 0; i < dev->nShortOpCaches; i++) {
3874 if (!dev->srCache[i].object)
3875 return &dev->srCache[i];
3876 }
3877
3878 return NULL;
3879
3880 theOne = -1;
3881 usage = 0; /* just to stop the compiler grizzling */
3882
3883 for (i = 0; i < dev->nShortOpCaches; i++) {
3884 if (!dev->srCache[i].dirty &&
3885 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3886 theOne < 0)) {
3887 usage = dev->srCache[i].lastUse;
3888 theOne = i;
3889 }
3890 }
3891
3892
3893 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3894 } else {
3895 return NULL;
3896 }
3897
3898 }
3899
3900 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3901 {
3902 yaffs_ChunkCache *cache;
3903 yaffs_Object *theObj;
3904 int usage;
3905 int i;
3906 int pushout;
3907
3908 if (dev->nShortOpCaches > 0) {
3909 /* Try find a non-dirty one... */
3910
3911 cache = yaffs_GrabChunkCacheWorker(dev);
3912
3913 if (!cache) {
3914 /* They were all dirty, find the last recently used object and flush
3915 * its cache, then find again.
3916 * NB what's here is not very accurate, we actually flush the object
3917 * the last recently used page.
3918 */
3919
3920 /* With locking we can't assume we can use entry zero */
3921
3922 theObj = NULL;
3923 usage = -1;
3924 cache = NULL;
3925 pushout = -1;
3926
3927 for (i = 0; i < dev->nShortOpCaches; i++) {
3928 if (dev->srCache[i].object &&
3929 !dev->srCache[i].locked &&
3930 (dev->srCache[i].lastUse < usage || !cache))
3931 {
3932 usage = dev->srCache[i].lastUse;
3933 theObj = dev->srCache[i].object;
3934 cache = &dev->srCache[i];
3935 pushout = i;
3936 }
3937 }
3938
3939 if (!cache || cache->dirty) {
3940 /* Flush and try again */
3941 yaffs_FlushFilesChunkCache(theObj);
3942 cache = yaffs_GrabChunkCacheWorker(dev);
3943 }
3944
3945 }
3946 return cache;
3947 } else
3948 return NULL;
3949
3950 }
3951
3952 /* Find a cached chunk */
3953 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3954 int chunkId)
3955 {
3956 yaffs_Device *dev = obj->myDev;
3957 int i;
3958 if (dev->nShortOpCaches > 0) {
3959 for (i = 0; i < dev->nShortOpCaches; i++) {
3960 if (dev->srCache[i].object == obj &&
3961 dev->srCache[i].chunkId == chunkId) {
3962 dev->cacheHits++;
3963
3964 return &dev->srCache[i];
3965 }
3966 }
3967 }
3968 return NULL;
3969 }
3970
3971 /* Mark the chunk for the least recently used algorithym */
3972 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3973 int isAWrite)
3974 {
3975
3976 if (dev->nShortOpCaches > 0) {
3977 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3978 /* Reset the cache usages */
3979 int i;
3980 for (i = 1; i < dev->nShortOpCaches; i++) {
3981 dev->srCache[i].lastUse = 0;
3982 }
3983 dev->srLastUse = 0;
3984 }
3985
3986 dev->srLastUse++;
3987
3988 cache->lastUse = dev->srLastUse;
3989
3990 if (isAWrite) {
3991 cache->dirty = 1;
3992 }
3993 }
3994 }
3995
3996 /* Invalidate a single cache page.
3997 * Do this when a whole page gets written,
3998 * ie the short cache for this page is no longer valid.
3999 */
4000 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
4001 {
4002 if (object->myDev->nShortOpCaches > 0) {
4003 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4004
4005 if (cache) {
4006 cache->object = NULL;
4007 }
4008 }
4009 }
4010
4011 /* Invalidate all the cache pages associated with this object
4012 * Do this whenever ther file is deleted or resized.
4013 */
4014 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
4015 {
4016 int i;
4017 yaffs_Device *dev = in->myDev;
4018
4019 if (dev->nShortOpCaches > 0) {
4020 /* Invalidate it. */
4021 for (i = 0; i < dev->nShortOpCaches; i++) {
4022 if (dev->srCache[i].object == in) {
4023 dev->srCache[i].object = NULL;
4024 }
4025 }
4026 }
4027 }
4028
4029 /*--------------------- Checkpointing --------------------*/
4030
4031
4032 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
4033 {
4034 yaffs_CheckpointValidity cp;
4035
4036 memset(&cp,0,sizeof(cp));
4037
4038 cp.structType = sizeof(cp);
4039 cp.magic = YAFFS_MAGIC;
4040 cp.version = YAFFS_CHECKPOINT_VERSION;
4041 cp.head = (head) ? 1 : 0;
4042
4043 return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
4044 1 : 0;
4045 }
4046
4047 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4048 {
4049 yaffs_CheckpointValidity cp;
4050 int ok;
4051
4052 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4053
4054 if(ok)
4055 ok = (cp.structType == sizeof(cp)) &&
4056 (cp.magic == YAFFS_MAGIC) &&
4057 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4058 (cp.head == ((head) ? 1 : 0));
4059 return ok ? 1 : 0;
4060 }
4061
4062 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4063 yaffs_Device *dev)
4064 {
4065 cp->nErasedBlocks = dev->nErasedBlocks;
4066 cp->allocationBlock = dev->allocationBlock;
4067 cp->allocationPage = dev->allocationPage;
4068 cp->nFreeChunks = dev->nFreeChunks;
4069
4070 cp->nDeletedFiles = dev->nDeletedFiles;
4071 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4072 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4073 cp->sequenceNumber = dev->sequenceNumber;
4074 cp->oldestDirtySequence = dev->oldestDirtySequence;
4075
4076 }
4077
4078 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4079 yaffs_CheckpointDevice *cp)
4080 {
4081 dev->nErasedBlocks = cp->nErasedBlocks;
4082 dev->allocationBlock = cp->allocationBlock;
4083 dev->allocationPage = cp->allocationPage;
4084 dev->nFreeChunks = cp->nFreeChunks;
4085
4086 dev->nDeletedFiles = cp->nDeletedFiles;
4087 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4088 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4089 dev->sequenceNumber = cp->sequenceNumber;
4090 dev->oldestDirtySequence = cp->oldestDirtySequence;
4091 }
4092
4093
4094 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4095 {
4096 yaffs_CheckpointDevice cp;
4097 __u32 nBytes;
4098 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4099
4100 int ok;
4101
4102 /* Write device runtime values*/
4103 yaffs_DeviceToCheckpointDevice(&cp,dev);
4104 cp.structType = sizeof(cp);
4105
4106 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4107
4108 /* Write block info */
4109 if(ok) {
4110 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4111 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
4112 }
4113
4114 /* Write chunk bits */
4115 if(ok) {
4116 nBytes = nBlocks * dev->chunkBitmapStride;
4117 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
4118 }
4119 return ok ? 1 : 0;
4120
4121 }
4122
4123 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4124 {
4125 yaffs_CheckpointDevice cp;
4126 __u32 nBytes;
4127 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4128
4129 int ok;
4130
4131 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4132 if(!ok)
4133 return 0;
4134
4135 if(cp.structType != sizeof(cp))
4136 return 0;
4137
4138
4139 yaffs_CheckpointDeviceToDevice(dev,&cp);
4140
4141 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4142
4143 ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
4144
4145 if(!ok)
4146 return 0;
4147 nBytes = nBlocks * dev->chunkBitmapStride;
4148
4149 ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
4150
4151 return ok ? 1 : 0;
4152 }
4153
4154 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4155 yaffs_Object *obj)
4156 {
4157
4158 cp->objectId = obj->objectId;
4159 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4160 cp->chunkId = obj->chunkId;
4161 cp->variantType = obj->variantType;
4162 cp->deleted = obj->deleted;
4163 cp->softDeleted = obj->softDeleted;
4164 cp->unlinked = obj->unlinked;
4165 cp->fake = obj->fake;
4166 cp->renameAllowed = obj->renameAllowed;
4167 cp->unlinkAllowed = obj->unlinkAllowed;
4168 cp->serial = obj->serial;
4169 cp->nDataChunks = obj->nDataChunks;
4170
4171 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4172 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4173 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4174 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4175 }
4176
4177 static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
4178 {
4179
4180 yaffs_Object *parent;
4181
4182 obj->objectId = cp->objectId;
4183
4184 if(cp->parentId)
4185 parent = yaffs_FindOrCreateObjectByNumber(
4186 obj->myDev,
4187 cp->parentId,
4188 YAFFS_OBJECT_TYPE_DIRECTORY);
4189 else
4190 parent = NULL;
4191
4192 if(parent)
4193 yaffs_AddObjectToDirectory(parent, obj);
4194
4195 obj->chunkId = cp->chunkId;
4196 obj->variantType = cp->variantType;
4197 obj->deleted = cp->deleted;
4198 obj->softDeleted = cp->softDeleted;
4199 obj->unlinked = cp->unlinked;
4200 obj->fake = cp->fake;
4201 obj->renameAllowed = cp->renameAllowed;
4202 obj->unlinkAllowed = cp->unlinkAllowed;
4203 obj->serial = cp->serial;
4204 obj->nDataChunks = cp->nDataChunks;
4205
4206 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4207 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4208 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4209 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4210
4211 if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
4212 obj->lazyLoaded = 1;
4213 }
4214
4215
4216
4217 static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
4218 __u32 level, int chunkOffset)
4219 {
4220 int i;
4221 yaffs_Device *dev = in->myDev;
4222 int ok = 1;
4223 int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4224
4225 if (tn) {
4226 if (level > 0) {
4227
4228 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
4229 if (tn->internal[i]) {
4230 ok = yaffs_CheckpointTnodeWorker(in,
4231 tn->internal[i],
4232 level - 1,
4233 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4234 }
4235 }
4236 } else if (level == 0) {
4237 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4238 /* printf("write tnode at %d\n",baseOffset); */
4239 ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
4240 if(ok)
4241 ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
4242 }
4243 }
4244
4245 return ok;
4246
4247 }
4248
4249 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4250 {
4251 __u32 endMarker = ~0;
4252 int ok = 1;
4253
4254 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4255 ok = yaffs_CheckpointTnodeWorker(obj,
4256 obj->variant.fileVariant.top,
4257 obj->variant.fileVariant.topLevel,
4258 0);
4259 if(ok)
4260 ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
4261 sizeof(endMarker));
4262 }
4263
4264 return ok ? 1 : 0;
4265 }
4266
4267 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4268 {
4269 __u32 baseChunk;
4270 int ok = 1;
4271 yaffs_Device *dev = obj->myDev;
4272 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4273 yaffs_Tnode *tn;
4274 int nread = 0;
4275
4276 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4277
4278 while(ok && (~baseChunk)){
4279 nread++;
4280 /* Read level 0 tnode */
4281
4282
4283 /* printf("read tnode at %d\n",baseChunk); */
4284 tn = yaffs_GetTnodeRaw(dev);
4285 if(tn)
4286 ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
4287 (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
4288 else
4289 ok = 0;
4290
4291 if(tn && ok){
4292 ok = yaffs_AddOrFindLevel0Tnode(dev,
4293 fileStructPtr,
4294 baseChunk,
4295 tn) ? 1 : 0;
4296
4297 }
4298
4299 if(ok)
4300 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4301
4302 }
4303
4304 T(YAFFS_TRACE_CHECKPOINT,(
4305 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4306 nread,baseChunk,ok));
4307
4308 return ok ? 1 : 0;
4309 }
4310
4311
4312 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4313 {
4314 yaffs_Object *obj;
4315 yaffs_CheckpointObject cp;
4316 int i;
4317 int ok = 1;
4318 struct list_head *lh;
4319
4320
4321 /* Iterate through the objects in each hash entry,
4322 * dumping them to the checkpointing stream.
4323 */
4324
4325 for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
4326 list_for_each(lh, &dev->objectBucket[i].list) {
4327 if (lh) {
4328 obj = list_entry(lh, yaffs_Object, hashLink);
4329 if (!obj->deferedFree) {
4330 yaffs_ObjectToCheckpointObject(&cp,obj);
4331 cp.structType = sizeof(cp);
4332
4333 T(YAFFS_TRACE_CHECKPOINT,(
4334 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4335 cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
4336
4337 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4338
4339 if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4340 ok = yaffs_WriteCheckpointTnodes(obj);
4341 }
4342 }
4343 }
4344 }
4345 }
4346
4347 /* Dump end of list */
4348 memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
4349 cp.structType = sizeof(cp);
4350
4351 if(ok)
4352 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4353
4354 return ok ? 1 : 0;
4355 }
4356
4357 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4358 {
4359 yaffs_Object *obj;
4360 yaffs_CheckpointObject cp;
4361 int ok = 1;
4362 int done = 0;
4363 yaffs_Object *hardList = NULL;
4364
4365 while(ok && !done) {
4366 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4367 if(cp.structType != sizeof(cp)) {
4368 T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
4369 cp.structType,sizeof(cp),ok));
4370 ok = 0;
4371 }
4372
4373 T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4374 cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
4375
4376 if(ok && cp.objectId == ~0)
4377 done = 1;
4378 else if(ok){
4379 obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
4380 if(obj) {
4381 yaffs_CheckpointObjectToObject(obj,&cp);
4382 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4383 ok = yaffs_ReadCheckpointTnodes(obj);
4384 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4385 obj->hardLinks.next =
4386 (struct list_head *)
4387 hardList;
4388 hardList = obj;
4389 }
4390
4391 }
4392 }
4393 }
4394
4395 if(ok)
4396 yaffs_HardlinkFixup(dev,hardList);
4397
4398 return ok ? 1 : 0;
4399 }
4400
4401 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4402 {
4403 __u32 checkpointSum;
4404 int ok;
4405
4406 yaffs_GetCheckpointSum(dev,&checkpointSum);
4407
4408 ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
4409
4410 if(!ok)
4411 return 0;
4412
4413 return 1;
4414 }
4415
4416 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4417 {
4418 __u32 checkpointSum0;
4419 __u32 checkpointSum1;
4420 int ok;
4421
4422 yaffs_GetCheckpointSum(dev,&checkpointSum0);
4423
4424 ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4425
4426 if(!ok)
4427 return 0;
4428
4429 if(checkpointSum0 != checkpointSum1)
4430 return 0;
4431
4432 return 1;
4433 }
4434
4435
4436 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4437 {
4438
4439 int ok = 1;
4440
4441 if(dev->skipCheckpointWrite || !dev->isYaffs2){
4442 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
4443 ok = 0;
4444 }
4445
4446 if(ok)
4447 ok = yaffs_CheckpointOpen(dev,1);
4448
4449 if(ok){
4450 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4451 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
4452 }
4453 if(ok){
4454 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
4455 ok = yaffs_WriteCheckpointDevice(dev);
4456 }
4457 if(ok){
4458 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
4459 ok = yaffs_WriteCheckpointObjects(dev);
4460 }
4461 if(ok){
4462 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4463 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
4464 }
4465
4466 if(ok){
4467 ok = yaffs_WriteCheckpointSum(dev);
4468 }
4469
4470
4471 if(!yaffs_CheckpointClose(dev))
4472 ok = 0;
4473
4474 if(ok)
4475 dev->isCheckpointed = 1;
4476 else
4477 dev->isCheckpointed = 0;
4478
4479 return dev->isCheckpointed;
4480 }
4481
4482 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4483 {
4484 int ok = 1;
4485
4486 if(dev->skipCheckpointRead || !dev->isYaffs2){
4487 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
4488 ok = 0;
4489 }
4490
4491 if(ok)
4492 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
4493
4494 if(ok){
4495 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4496 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
4497 }
4498 if(ok){
4499 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
4500 ok = yaffs_ReadCheckpointDevice(dev);
4501 }
4502 if(ok){
4503 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
4504 ok = yaffs_ReadCheckpointObjects(dev);
4505 }
4506 if(ok){
4507 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4508 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
4509 }
4510
4511 if(ok){
4512 ok = yaffs_ReadCheckpointSum(dev);
4513 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
4514 }
4515
4516 if(!yaffs_CheckpointClose(dev))
4517 ok = 0;
4518
4519 if(ok)
4520 dev->isCheckpointed = 1;
4521 else
4522 dev->isCheckpointed = 0;
4523
4524 return ok ? 1 : 0;
4525
4526 }
4527
4528 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4529 {
4530 if(dev->isCheckpointed ||
4531 dev->blocksInCheckpoint > 0){
4532 dev->isCheckpointed = 0;
4533 yaffs_CheckpointInvalidateStream(dev);
4534 if(dev->superBlock && dev->markSuperBlockDirty)
4535 dev->markSuperBlockDirty(dev->superBlock);
4536 }
4537 }
4538
4539
4540 int yaffs_CheckpointSave(yaffs_Device *dev)
4541 {
4542
4543 T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4544
4545 yaffs_VerifyObjects(dev);
4546 yaffs_VerifyBlocks(dev);
4547 yaffs_VerifyFreeChunks(dev);
4548
4549 if(!dev->isCheckpointed) {
4550 yaffs_InvalidateCheckpoint(dev);
4551 yaffs_WriteCheckpointData(dev);
4552 }
4553
4554 T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4555
4556 return dev->isCheckpointed;
4557 }
4558
4559 int yaffs_CheckpointRestore(yaffs_Device *dev)
4560 {
4561 int retval;
4562 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4563
4564 retval = yaffs_ReadCheckpointData(dev);
4565
4566 if(dev->isCheckpointed){
4567 yaffs_VerifyObjects(dev);
4568 yaffs_VerifyBlocks(dev);
4569 yaffs_VerifyFreeChunks(dev);
4570 }
4571
4572 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4573
4574 return retval;
4575 }
4576
4577 /*--------------------- File read/write ------------------------
4578 * Read and write have very similar structures.
4579 * In general the read/write has three parts to it
4580 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4581 * Some complete chunks
4582 * An incomplete chunk to end off with
4583 *
4584 * Curve-balls: the first chunk might also be the last chunk.
4585 */
4586
4587 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
4588 int nBytes)
4589 {
4590
4591 int chunk;
4592 int start;
4593 int nToCopy;
4594 int n = nBytes;
4595 int nDone = 0;
4596 yaffs_ChunkCache *cache;
4597
4598 yaffs_Device *dev;
4599
4600 dev = in->myDev;
4601
4602 while (n > 0) {
4603 //chunk = offset / dev->nDataBytesPerChunk + 1;
4604 //start = offset % dev->nDataBytesPerChunk;
4605 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4606 chunk++;
4607
4608 /* OK now check for the curveball where the start and end are in
4609 * the same chunk.
4610 */
4611 if ((start + n) < dev->nDataBytesPerChunk) {
4612 nToCopy = n;
4613 } else {
4614 nToCopy = dev->nDataBytesPerChunk - start;
4615 }
4616
4617 cache = yaffs_FindChunkCache(in, chunk);
4618
4619 /* If the chunk is already in the cache or it is less than a whole chunk
4620 * then use the cache (if there is caching)
4621 * else bypass the cache.
4622 */
4623 if (cache || nToCopy != dev->nDataBytesPerChunk) {
4624 if (dev->nShortOpCaches > 0) {
4625
4626 /* If we can't find the data in the cache, then load it up. */
4627
4628 if (!cache) {
4629 cache = yaffs_GrabChunkCache(in->myDev);
4630 cache->object = in;
4631 cache->chunkId = chunk;
4632 cache->dirty = 0;
4633 cache->locked = 0;
4634 yaffs_ReadChunkDataFromObject(in, chunk,
4635 cache->
4636 data);
4637 cache->nBytes = 0;
4638 }
4639
4640 yaffs_UseChunkCache(dev, cache, 0);
4641
4642 cache->locked = 1;
4643
4644 #ifdef CONFIG_YAFFS_WINCE
4645 yfsd_UnlockYAFFS(TRUE);
4646 #endif
4647 memcpy(buffer, &cache->data[start], nToCopy);
4648
4649 #ifdef CONFIG_YAFFS_WINCE
4650 yfsd_LockYAFFS(TRUE);
4651 #endif
4652 cache->locked = 0;
4653 } else {
4654 /* Read into the local buffer then copy..*/
4655
4656 __u8 *localBuffer =
4657 yaffs_GetTempBuffer(dev, __LINE__);
4658 yaffs_ReadChunkDataFromObject(in, chunk,
4659 localBuffer);
4660 #ifdef CONFIG_YAFFS_WINCE
4661 yfsd_UnlockYAFFS(TRUE);
4662 #endif
4663 memcpy(buffer, &localBuffer[start], nToCopy);
4664
4665 #ifdef CONFIG_YAFFS_WINCE
4666 yfsd_LockYAFFS(TRUE);
4667 #endif
4668 yaffs_ReleaseTempBuffer(dev, localBuffer,
4669 __LINE__);
4670 }
4671
4672 } else {
4673 #ifdef CONFIG_YAFFS_WINCE
4674 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4675
4676 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4677 * This is because we otherwise screw up WinCE's memory mapper
4678 */
4679 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
4680
4681 #ifdef CONFIG_YAFFS_WINCE
4682 yfsd_UnlockYAFFS(TRUE);
4683 #endif
4684 memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
4685
4686 #ifdef CONFIG_YAFFS_WINCE
4687 yfsd_LockYAFFS(TRUE);
4688 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4689 #endif
4690
4691 #else
4692 /* A full chunk. Read directly into the supplied buffer. */
4693 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4694 #endif
4695 }
4696
4697 n -= nToCopy;
4698 offset += nToCopy;
4699 buffer += nToCopy;
4700 nDone += nToCopy;
4701
4702 }
4703
4704 return nDone;
4705 }
4706
4707 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
4708 int nBytes, int writeThrough)
4709 {
4710
4711 int chunk;
4712 int start;
4713 int nToCopy;
4714 int n = nBytes;
4715 int nDone = 0;
4716 int nToWriteBack;
4717 int startOfWrite = offset;
4718 int chunkWritten = 0;
4719 int nBytesRead;
4720
4721 yaffs_Device *dev;
4722
4723 dev = in->myDev;
4724
4725 while (n > 0 && chunkWritten >= 0) {
4726 //chunk = offset / dev->nDataBytesPerChunk + 1;
4727 //start = offset % dev->nDataBytesPerChunk;
4728 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4729 chunk++;
4730
4731 /* OK now check for the curveball where the start and end are in
4732 * the same chunk.
4733 */
4734
4735 if ((start + n) < dev->nDataBytesPerChunk) {
4736 nToCopy = n;
4737
4738 /* Now folks, to calculate how many bytes to write back....
4739 * If we're overwriting and not writing to then end of file then
4740 * we need to write back as much as was there before.
4741 */
4742
4743 nBytesRead =
4744 in->variant.fileVariant.fileSize -
4745 ((chunk - 1) * dev->nDataBytesPerChunk);
4746
4747 if (nBytesRead > dev->nDataBytesPerChunk) {
4748 nBytesRead = dev->nDataBytesPerChunk;
4749 }
4750
4751 nToWriteBack =
4752 (nBytesRead >
4753 (start + n)) ? nBytesRead : (start + n);
4754
4755 } else {
4756 nToCopy = dev->nDataBytesPerChunk - start;
4757 nToWriteBack = dev->nDataBytesPerChunk;
4758 }
4759
4760 if (nToCopy != dev->nDataBytesPerChunk) {
4761 /* An incomplete start or end chunk (or maybe both start and end chunk) */
4762 if (dev->nShortOpCaches > 0) {
4763 yaffs_ChunkCache *cache;
4764 /* If we can't find the data in the cache, then load the cache */
4765 cache = yaffs_FindChunkCache(in, chunk);
4766
4767 if (!cache
4768 && yaffs_CheckSpaceForAllocation(in->
4769 myDev)) {
4770 cache = yaffs_GrabChunkCache(in->myDev);
4771 cache->object = in;
4772 cache->chunkId = chunk;
4773 cache->dirty = 0;
4774 cache->locked = 0;
4775 yaffs_ReadChunkDataFromObject(in, chunk,
4776 cache->
4777 data);
4778 }
4779 else if(cache &&
4780 !cache->dirty &&
4781 !yaffs_CheckSpaceForAllocation(in->myDev)){
4782 /* Drop the cache if it was a read cache item and
4783 * no space check has been made for it.
4784 */
4785 cache = NULL;
4786 }
4787
4788 if (cache) {
4789 yaffs_UseChunkCache(dev, cache, 1);
4790 cache->locked = 1;
4791 #ifdef CONFIG_YAFFS_WINCE
4792 yfsd_UnlockYAFFS(TRUE);
4793 #endif
4794
4795 memcpy(&cache->data[start], buffer,
4796 nToCopy);
4797
4798 #ifdef CONFIG_YAFFS_WINCE
4799 yfsd_LockYAFFS(TRUE);
4800 #endif
4801 cache->locked = 0;
4802 cache->nBytes = nToWriteBack;
4803
4804 if (writeThrough) {
4805 chunkWritten =
4806 yaffs_WriteChunkDataToObject
4807 (cache->object,
4808 cache->chunkId,
4809 cache->data, cache->nBytes,
4810 1);
4811 cache->dirty = 0;
4812 }
4813
4814 } else {
4815 chunkWritten = -1; /* fail the write */
4816 }
4817 } else {
4818 /* An incomplete start or end chunk (or maybe both start and end chunk)
4819 * Read into the local buffer then copy, then copy over and write back.
4820 */
4821
4822 __u8 *localBuffer =
4823 yaffs_GetTempBuffer(dev, __LINE__);
4824
4825 yaffs_ReadChunkDataFromObject(in, chunk,
4826 localBuffer);
4827
4828 #ifdef CONFIG_YAFFS_WINCE
4829 yfsd_UnlockYAFFS(TRUE);
4830 #endif
4831
4832 memcpy(&localBuffer[start], buffer, nToCopy);
4833
4834 #ifdef CONFIG_YAFFS_WINCE
4835 yfsd_LockYAFFS(TRUE);
4836 #endif
4837 chunkWritten =
4838 yaffs_WriteChunkDataToObject(in, chunk,
4839 localBuffer,
4840 nToWriteBack,
4841 0);
4842
4843 yaffs_ReleaseTempBuffer(dev, localBuffer,
4844 __LINE__);
4845
4846 }
4847
4848 } else {
4849
4850 #ifdef CONFIG_YAFFS_WINCE
4851 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4852 * This is because we otherwise screw up WinCE's memory mapper
4853 */
4854 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4855 #ifdef CONFIG_YAFFS_WINCE
4856 yfsd_UnlockYAFFS(TRUE);
4857 #endif
4858 memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
4859 #ifdef CONFIG_YAFFS_WINCE
4860 yfsd_LockYAFFS(TRUE);
4861 #endif
4862 chunkWritten =
4863 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
4864 dev->nDataBytesPerChunk,
4865 0);
4866 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4867 #else
4868 /* A full chunk. Write directly from the supplied buffer. */
4869 chunkWritten =
4870 yaffs_WriteChunkDataToObject(in, chunk, buffer,
4871 dev->nDataBytesPerChunk,
4872 0);
4873 #endif
4874 /* Since we've overwritten the cached data, we better invalidate it. */
4875 yaffs_InvalidateChunkCache(in, chunk);
4876 }
4877
4878 if (chunkWritten >= 0) {
4879 n -= nToCopy;
4880 offset += nToCopy;
4881 buffer += nToCopy;
4882 nDone += nToCopy;
4883 }
4884
4885 }
4886
4887 /* Update file object */
4888
4889 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
4890 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4891 }
4892
4893 in->dirty = 1;
4894
4895 return nDone;
4896 }
4897
4898
4899 /* ---------------------- File resizing stuff ------------------ */
4900
4901 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
4902 {
4903
4904 yaffs_Device *dev = in->myDev;
4905 int oldFileSize = in->variant.fileVariant.fileSize;
4906
4907 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4908
4909 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4910 dev->nDataBytesPerChunk;
4911 int i;
4912 int chunkId;
4913
4914 /* Delete backwards so that we don't end up with holes if
4915 * power is lost part-way through the operation.
4916 */
4917 for (i = lastDel; i >= startDel; i--) {
4918 /* NB this could be optimised somewhat,
4919 * eg. could retrieve the tags and write them without
4920 * using yaffs_DeleteChunk
4921 */
4922
4923 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4924 if (chunkId > 0) {
4925 if (chunkId <
4926 (dev->internalStartBlock * dev->nChunksPerBlock)
4927 || chunkId >=
4928 ((dev->internalEndBlock +
4929 1) * dev->nChunksPerBlock)) {
4930 T(YAFFS_TRACE_ALWAYS,
4931 (TSTR("Found daft chunkId %d for %d" TENDSTR),
4932 chunkId, i));
4933 } else {
4934 in->nDataChunks--;
4935 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4936 }
4937 }
4938 }
4939
4940 }
4941
4942 int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
4943 {
4944
4945 int oldFileSize = in->variant.fileVariant.fileSize;
4946 int newSizeOfPartialChunk;
4947 int newFullChunks;
4948
4949 yaffs_Device *dev = in->myDev;
4950
4951 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4952
4953 yaffs_FlushFilesChunkCache(in);
4954 yaffs_InvalidateWholeChunkCache(in);
4955
4956 yaffs_CheckGarbageCollection(dev);
4957
4958 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
4959 return yaffs_GetFileSize(in);
4960 }
4961
4962 if (newSize == oldFileSize) {
4963 return oldFileSize;
4964 }
4965
4966 if (newSize < oldFileSize) {
4967
4968 yaffs_PruneResizedChunks(in, newSize);
4969
4970 if (newSizeOfPartialChunk != 0) {
4971 int lastChunk = 1 + newFullChunks;
4972
4973 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4974
4975 /* Got to read and rewrite the last chunk with its new size and zero pad */
4976 yaffs_ReadChunkDataFromObject(in, lastChunk,
4977 localBuffer);
4978
4979 memset(localBuffer + newSizeOfPartialChunk, 0,
4980 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
4981
4982 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
4983 newSizeOfPartialChunk, 1);
4984
4985 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4986 }
4987
4988 in->variant.fileVariant.fileSize = newSize;
4989
4990 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
4991 } else {
4992 /* newsSize > oldFileSize */
4993 in->variant.fileVariant.fileSize = newSize;
4994 }
4995
4996
4997
4998 /* Write a new object header.
4999 * show we've shrunk the file, if need be
5000 * Do this only if the file is not in the deleted directories.
5001 */
5002 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5003 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
5004 yaffs_UpdateObjectHeader(in, NULL, 0,
5005 (newSize < oldFileSize) ? 1 : 0, 0);
5006 }
5007
5008 return newSize;
5009 }
5010
5011 loff_t yaffs_GetFileSize(yaffs_Object * obj)
5012 {
5013 obj = yaffs_GetEquivalentObject(obj);
5014
5015 switch (obj->variantType) {
5016 case YAFFS_OBJECT_TYPE_FILE:
5017 return obj->variant.fileVariant.fileSize;
5018 case YAFFS_OBJECT_TYPE_SYMLINK:
5019 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5020 default:
5021 return 0;
5022 }
5023 }
5024
5025
5026
5027 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
5028 {
5029 int retVal;
5030 if (in->dirty) {
5031 yaffs_FlushFilesChunkCache(in);
5032 if (updateTime) {
5033 #ifdef CONFIG_YAFFS_WINCE
5034 yfsd_WinFileTimeNow(in->win_mtime);
5035 #else
5036
5037 in->yst_mtime = Y_CURRENT_TIME;
5038
5039 #endif
5040 }
5041
5042 retVal =
5043 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5044 0) ? YAFFS_OK : YAFFS_FAIL;
5045 } else {
5046 retVal = YAFFS_OK;
5047 }
5048
5049 return retVal;
5050
5051 }
5052
5053 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
5054 {
5055
5056 /* First off, invalidate the file's data in the cache, without flushing. */
5057 yaffs_InvalidateWholeChunkCache(in);
5058
5059 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5060 /* Move to the unlinked directory so we have a record that it was deleted. */
5061 yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
5062
5063 }
5064
5065 yaffs_RemoveObjectFromDirectory(in);
5066 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
5067 in->chunkId = -1;
5068
5069 yaffs_FreeObject(in);
5070 return YAFFS_OK;
5071
5072 }
5073
5074 /* yaffs_DeleteFile deletes the whole file data
5075 * and the inode associated with the file.
5076 * It does not delete the links associated with the file.
5077 */
5078 static int yaffs_UnlinkFile(yaffs_Object * in)
5079 {
5080
5081 int retVal;
5082 int immediateDeletion = 0;
5083
5084 if (1) {
5085 #ifdef __KERNEL__
5086 if (!in->myInode) {
5087 immediateDeletion = 1;
5088
5089 }
5090 #else
5091 if (in->inUse <= 0) {
5092 immediateDeletion = 1;
5093
5094 }
5095 #endif
5096 if (immediateDeletion) {
5097 retVal =
5098 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5099 "deleted", 0, 0);
5100 T(YAFFS_TRACE_TRACING,
5101 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5102 in->objectId));
5103 in->deleted = 1;
5104 in->myDev->nDeletedFiles++;
5105 if (0 && in->myDev->isYaffs2) {
5106 yaffs_ResizeFile(in, 0);
5107 }
5108 yaffs_SoftDeleteFile(in);
5109 } else {
5110 retVal =
5111 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5112 "unlinked", 0, 0);
5113 }
5114
5115 }
5116 return retVal;
5117 }
5118
5119 int yaffs_DeleteFile(yaffs_Object * in)
5120 {
5121 int retVal = YAFFS_OK;
5122
5123 if (in->nDataChunks > 0) {
5124 /* Use soft deletion if there is data in the file */
5125 if (!in->unlinked) {
5126 retVal = yaffs_UnlinkFile(in);
5127 }
5128 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5129 in->deleted = 1;
5130 in->myDev->nDeletedFiles++;
5131 yaffs_SoftDeleteFile(in);
5132 }
5133 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
5134 } else {
5135 /* The file has no data chunks so we toss it immediately */
5136 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5137 in->variant.fileVariant.top = NULL;
5138 yaffs_DoGenericObjectDeletion(in);
5139
5140 return YAFFS_OK;
5141 }
5142 }
5143
5144 static int yaffs_DeleteDirectory(yaffs_Object * in)
5145 {
5146 /* First check that the directory is empty. */
5147 if (list_empty(&in->variant.directoryVariant.children)) {
5148 return yaffs_DoGenericObjectDeletion(in);
5149 }
5150
5151 return YAFFS_FAIL;
5152
5153 }
5154
5155 static int yaffs_DeleteSymLink(yaffs_Object * in)
5156 {
5157 YFREE(in->variant.symLinkVariant.alias);
5158
5159 return yaffs_DoGenericObjectDeletion(in);
5160 }
5161
5162 static int yaffs_DeleteHardLink(yaffs_Object * in)
5163 {
5164 /* remove this hardlink from the list assocaited with the equivalent
5165 * object
5166 */
5167 list_del(&in->hardLinks);
5168 return yaffs_DoGenericObjectDeletion(in);
5169 }
5170
5171 static void yaffs_DestroyObject(yaffs_Object * obj)
5172 {
5173 switch (obj->variantType) {
5174 case YAFFS_OBJECT_TYPE_FILE:
5175 yaffs_DeleteFile(obj);
5176 break;
5177 case YAFFS_OBJECT_TYPE_DIRECTORY:
5178 yaffs_DeleteDirectory(obj);
5179 break;
5180 case YAFFS_OBJECT_TYPE_SYMLINK:
5181 yaffs_DeleteSymLink(obj);
5182 break;
5183 case YAFFS_OBJECT_TYPE_HARDLINK:
5184 yaffs_DeleteHardLink(obj);
5185 break;
5186 case YAFFS_OBJECT_TYPE_SPECIAL:
5187 yaffs_DoGenericObjectDeletion(obj);
5188 break;
5189 case YAFFS_OBJECT_TYPE_UNKNOWN:
5190 break; /* should not happen. */
5191 }
5192 }
5193
5194 static int yaffs_UnlinkWorker(yaffs_Object * obj)
5195 {
5196
5197 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5198 return yaffs_DeleteHardLink(obj);
5199 } else if (!list_empty(&obj->hardLinks)) {
5200 /* Curve ball: We're unlinking an object that has a hardlink.
5201 *
5202 * This problem arises because we are not strictly following
5203 * The Linux link/inode model.
5204 *
5205 * We can't really delete the object.
5206 * Instead, we do the following:
5207 * - Select a hardlink.
5208 * - Unhook it from the hard links
5209 * - Unhook it from its parent directory (so that the rename can work)
5210 * - Rename the object to the hardlink's name.
5211 * - Delete the hardlink
5212 */
5213
5214 yaffs_Object *hl;
5215 int retVal;
5216 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5217
5218 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5219
5220 list_del_init(&hl->hardLinks);
5221 list_del_init(&hl->siblings);
5222
5223 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5224
5225 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5226
5227 if (retVal == YAFFS_OK) {
5228 retVal = yaffs_DoGenericObjectDeletion(hl);
5229 }
5230 return retVal;
5231
5232 } else {
5233 switch (obj->variantType) {
5234 case YAFFS_OBJECT_TYPE_FILE:
5235 return yaffs_UnlinkFile(obj);
5236 break;
5237 case YAFFS_OBJECT_TYPE_DIRECTORY:
5238 return yaffs_DeleteDirectory(obj);
5239 break;
5240 case YAFFS_OBJECT_TYPE_SYMLINK:
5241 return yaffs_DeleteSymLink(obj);
5242 break;
5243 case YAFFS_OBJECT_TYPE_SPECIAL:
5244 return yaffs_DoGenericObjectDeletion(obj);
5245 break;
5246 case YAFFS_OBJECT_TYPE_HARDLINK:
5247 case YAFFS_OBJECT_TYPE_UNKNOWN:
5248 default:
5249 return YAFFS_FAIL;
5250 }
5251 }
5252 }
5253
5254
5255 static int yaffs_UnlinkObject( yaffs_Object *obj)
5256 {
5257
5258 if (obj && obj->unlinkAllowed) {
5259 return yaffs_UnlinkWorker(obj);
5260 }
5261
5262 return YAFFS_FAIL;
5263
5264 }
5265 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
5266 {
5267 yaffs_Object *obj;
5268
5269 obj = yaffs_FindObjectByName(dir, name);
5270 return yaffs_UnlinkObject(obj);
5271 }
5272
5273 /*----------------------- Initialisation Scanning ---------------------- */
5274
5275 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
5276 int backwardScanning)
5277 {
5278 yaffs_Object *obj;
5279
5280 if (!backwardScanning) {
5281 /* Handle YAFFS1 forward scanning case
5282 * For YAFFS1 we always do the deletion
5283 */
5284
5285 } else {
5286 /* Handle YAFFS2 case (backward scanning)
5287 * If the shadowed object exists then ignore.
5288 */
5289 if (yaffs_FindObjectByNumber(dev, objId)) {
5290 return;
5291 }
5292 }
5293
5294 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5295 * We put it in unlinked dir to be cleaned up after the scanning
5296 */
5297 obj =
5298 yaffs_FindOrCreateObjectByNumber(dev, objId,
5299 YAFFS_OBJECT_TYPE_FILE);
5300 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5301 obj->variant.fileVariant.shrinkSize = 0;
5302 obj->valid = 1; /* So that we don't read any other info for this file */
5303
5304 }
5305
5306 typedef struct {
5307 int seq;
5308 int block;
5309 } yaffs_BlockIndex;
5310
5311
5312 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5313 {
5314 yaffs_Object *hl;
5315 yaffs_Object *in;
5316
5317 while (hardList) {
5318 hl = hardList;
5319 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5320
5321 in = yaffs_FindObjectByNumber(dev,
5322 hl->variant.hardLinkVariant.
5323 equivalentObjectId);
5324
5325 if (in) {
5326 /* Add the hardlink pointers */
5327 hl->variant.hardLinkVariant.equivalentObject = in;
5328 list_add(&hl->hardLinks, &in->hardLinks);
5329 } else {
5330 /* Todo Need to report/handle this better.
5331 * Got a problem... hardlink to a non-existant object
5332 */
5333 hl->variant.hardLinkVariant.equivalentObject = NULL;
5334 INIT_LIST_HEAD(&hl->hardLinks);
5335
5336 }
5337
5338 }
5339
5340 }
5341
5342
5343
5344
5345
5346 static int ybicmp(const void *a, const void *b){
5347 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5348 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5349 register int ablock = ((yaffs_BlockIndex *)a)->block;
5350 register int bblock = ((yaffs_BlockIndex *)b)->block;
5351 if( aseq == bseq )
5352 return ablock - bblock;
5353 else
5354 return aseq - bseq;
5355
5356 }
5357
5358 static int yaffs_Scan(yaffs_Device * dev)
5359 {
5360 yaffs_ExtendedTags tags;
5361 int blk;
5362 int blockIterator;
5363 int startIterator;
5364 int endIterator;
5365 int nBlocksToScan = 0;
5366 int result;
5367
5368 int chunk;
5369 int c;
5370 int deleted;
5371 yaffs_BlockState state;
5372 yaffs_Object *hardList = NULL;
5373 yaffs_BlockInfo *bi;
5374 int sequenceNumber;
5375 yaffs_ObjectHeader *oh;
5376 yaffs_Object *in;
5377 yaffs_Object *parent;
5378 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5379
5380 int alloc_failed = 0;
5381
5382
5383 __u8 *chunkData;
5384
5385 yaffs_BlockIndex *blockIndex = NULL;
5386
5387 if (dev->isYaffs2) {
5388 T(YAFFS_TRACE_SCAN,
5389 (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
5390 return YAFFS_FAIL;
5391 }
5392
5393 //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
5394
5395 T(YAFFS_TRACE_SCAN,
5396 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5397 dev->internalStartBlock, dev->internalEndBlock));
5398
5399 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5400
5401 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5402
5403 if (dev->isYaffs2) {
5404 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5405 if(!blockIndex)
5406 return YAFFS_FAIL;
5407 }
5408
5409 /* Scan all the blocks to determine their state */
5410 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5411 bi = yaffs_GetBlockInfo(dev, blk);
5412 yaffs_ClearChunkBits(dev, blk);
5413 bi->pagesInUse = 0;
5414 bi->softDeletions = 0;
5415
5416 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5417
5418 bi->blockState = state;
5419 bi->sequenceNumber = sequenceNumber;
5420
5421 T(YAFFS_TRACE_SCAN_DEBUG,
5422 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5423 state, sequenceNumber));
5424
5425 if (state == YAFFS_BLOCK_STATE_DEAD) {
5426 T(YAFFS_TRACE_BAD_BLOCKS,
5427 (TSTR("block %d is bad" TENDSTR), blk));
5428 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5429 T(YAFFS_TRACE_SCAN_DEBUG,
5430 (TSTR("Block empty " TENDSTR)));
5431 dev->nErasedBlocks++;
5432 dev->nFreeChunks += dev->nChunksPerBlock;
5433 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5434
5435 /* Determine the highest sequence number */
5436 if (dev->isYaffs2 &&
5437 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5438 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5439
5440 blockIndex[nBlocksToScan].seq = sequenceNumber;
5441 blockIndex[nBlocksToScan].block = blk;
5442
5443 nBlocksToScan++;
5444
5445 if (sequenceNumber >= dev->sequenceNumber) {
5446 dev->sequenceNumber = sequenceNumber;
5447 }
5448 } else if (dev->isYaffs2) {
5449 /* TODO: Nasty sequence number! */
5450 T(YAFFS_TRACE_SCAN,
5451 (TSTR
5452 ("Block scanning block %d has bad sequence number %d"
5453 TENDSTR), blk, sequenceNumber));
5454
5455 }
5456 }
5457 }
5458
5459 /* Sort the blocks
5460 * Dungy old bubble sort for now...
5461 */
5462 if (dev->isYaffs2) {
5463 yaffs_BlockIndex temp;
5464 int i;
5465 int j;
5466
5467 for (i = 0; i < nBlocksToScan; i++)
5468 for (j = i + 1; j < nBlocksToScan; j++)
5469 if (blockIndex[i].seq > blockIndex[j].seq) {
5470 temp = blockIndex[j];
5471 blockIndex[j] = blockIndex[i];
5472 blockIndex[i] = temp;
5473 }
5474 }
5475
5476 /* Now scan the blocks looking at the data. */
5477 if (dev->isYaffs2) {
5478 startIterator = 0;
5479 endIterator = nBlocksToScan - 1;
5480 T(YAFFS_TRACE_SCAN_DEBUG,
5481 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5482 } else {
5483 startIterator = dev->internalStartBlock;
5484 endIterator = dev->internalEndBlock;
5485 }
5486
5487 /* For each block.... */
5488 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5489 blockIterator++) {
5490
5491 if (dev->isYaffs2) {
5492 /* get the block to scan in the correct order */
5493 blk = blockIndex[blockIterator].block;
5494 } else {
5495 blk = blockIterator;
5496 }
5497
5498 bi = yaffs_GetBlockInfo(dev, blk);
5499 state = bi->blockState;
5500
5501 deleted = 0;
5502
5503 /* For each chunk in each block that needs scanning....*/
5504 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5505 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5506 /* Read the tags and decide what to do */
5507 chunk = blk * dev->nChunksPerBlock + c;
5508
5509 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5510 &tags);
5511
5512 /* Let's have a good look at this chunk... */
5513
5514 if (!dev->isYaffs2 && tags.chunkDeleted) {
5515 /* YAFFS1 only...
5516 * A deleted chunk
5517 */
5518 deleted++;
5519 dev->nFreeChunks++;
5520 /*T((" %d %d deleted\n",blk,c)); */
5521 } else if (!tags.chunkUsed) {
5522 /* An unassigned chunk in the block
5523 * This means that either the block is empty or
5524 * this is the one being allocated from
5525 */
5526
5527 if (c == 0) {
5528 /* We're looking at the first chunk in the block so the block is unused */
5529 state = YAFFS_BLOCK_STATE_EMPTY;
5530 dev->nErasedBlocks++;
5531 } else {
5532 /* this is the block being allocated from */
5533 T(YAFFS_TRACE_SCAN,
5534 (TSTR
5535 (" Allocating from %d %d" TENDSTR),
5536 blk, c));
5537 state = YAFFS_BLOCK_STATE_ALLOCATING;
5538 dev->allocationBlock = blk;
5539 dev->allocationPage = c;
5540 dev->allocationBlockFinder = blk;
5541 /* Set it to here to encourage the allocator to go forth from here. */
5542
5543 /* Yaffs2 sanity check:
5544 * This should be the one with the highest sequence number
5545 */
5546 if (dev->isYaffs2
5547 && (dev->sequenceNumber !=
5548 bi->sequenceNumber)) {
5549 T(YAFFS_TRACE_ALWAYS,
5550 (TSTR
5551 ("yaffs: Allocation block %d was not highest sequence id:"
5552 " block seq = %d, dev seq = %d"
5553 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
5554 }
5555 }
5556
5557 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5558 } else if (tags.chunkId > 0) {
5559 /* chunkId > 0 so it is a data chunk... */
5560 unsigned int endpos;
5561
5562 yaffs_SetChunkBit(dev, blk, c);
5563 bi->pagesInUse++;
5564
5565 in = yaffs_FindOrCreateObjectByNumber(dev,
5566 tags.
5567 objectId,
5568 YAFFS_OBJECT_TYPE_FILE);
5569 /* PutChunkIntoFile checks for a clash (two data chunks with
5570 * the same chunkId).
5571 */
5572
5573 if(!in)
5574 alloc_failed = 1;
5575
5576 if(in){
5577 if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
5578 alloc_failed = 1;
5579 }
5580
5581 endpos =
5582 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5583 tags.byteCount;
5584 if (in &&
5585 in->variantType == YAFFS_OBJECT_TYPE_FILE
5586 && in->variant.fileVariant.scannedFileSize <
5587 endpos) {
5588 in->variant.fileVariant.
5589 scannedFileSize = endpos;
5590 if (!dev->useHeaderFileSize) {
5591 in->variant.fileVariant.
5592 fileSize =
5593 in->variant.fileVariant.
5594 scannedFileSize;
5595 }
5596
5597 }
5598 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5599 } else {
5600 /* chunkId == 0, so it is an ObjectHeader.
5601 * Thus, we read in the object header and make the object
5602 */
5603 yaffs_SetChunkBit(dev, blk, c);
5604 bi->pagesInUse++;
5605
5606 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5607 chunkData,
5608 NULL);
5609
5610 oh = (yaffs_ObjectHeader *) chunkData;
5611
5612 in = yaffs_FindObjectByNumber(dev,
5613 tags.objectId);
5614 if (in && in->variantType != oh->type) {
5615 /* This should not happen, but somehow
5616 * Wev'e ended up with an objectId that has been reused but not yet
5617 * deleted, and worse still it has changed type. Delete the old object.
5618 */
5619
5620 yaffs_DestroyObject(in);
5621
5622 in = 0;
5623 }
5624
5625 in = yaffs_FindOrCreateObjectByNumber(dev,
5626 tags.
5627 objectId,
5628 oh->type);
5629
5630 if(!in)
5631 alloc_failed = 1;
5632
5633 if (in && oh->shadowsObject > 0) {
5634 yaffs_HandleShadowedObject(dev,
5635 oh->
5636 shadowsObject,
5637 0);
5638 }
5639
5640 if (in && in->valid) {
5641 /* We have already filled this one. We have a duplicate and need to resolve it. */
5642
5643 unsigned existingSerial = in->serial;
5644 unsigned newSerial = tags.serialNumber;
5645
5646 if (dev->isYaffs2 ||
5647 ((existingSerial + 1) & 3) ==
5648 newSerial) {
5649 /* Use new one - destroy the exisiting one */
5650 yaffs_DeleteChunk(dev,
5651 in->chunkId,
5652 1, __LINE__);
5653 in->valid = 0;
5654 } else {
5655 /* Use existing - destroy this one. */
5656 yaffs_DeleteChunk(dev, chunk, 1,
5657 __LINE__);
5658 }
5659 }
5660
5661 if (in && !in->valid &&
5662 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5663 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5664 /* We only load some info, don't fiddle with directory structure */
5665 in->valid = 1;
5666 in->variantType = oh->type;
5667
5668 in->yst_mode = oh->yst_mode;
5669 #ifdef CONFIG_YAFFS_WINCE
5670 in->win_atime[0] = oh->win_atime[0];
5671 in->win_ctime[0] = oh->win_ctime[0];
5672 in->win_mtime[0] = oh->win_mtime[0];
5673 in->win_atime[1] = oh->win_atime[1];
5674 in->win_ctime[1] = oh->win_ctime[1];
5675 in->win_mtime[1] = oh->win_mtime[1];
5676 #else
5677 in->yst_uid = oh->yst_uid;
5678 in->yst_gid = oh->yst_gid;
5679 in->yst_atime = oh->yst_atime;
5680 in->yst_mtime = oh->yst_mtime;
5681 in->yst_ctime = oh->yst_ctime;
5682 in->yst_rdev = oh->yst_rdev;
5683 #endif
5684 in->chunkId = chunk;
5685
5686 } else if (in && !in->valid) {
5687 /* we need to load this info */
5688
5689 in->valid = 1;
5690 in->variantType = oh->type;
5691
5692 in->yst_mode = oh->yst_mode;
5693 #ifdef CONFIG_YAFFS_WINCE
5694 in->win_atime[0] = oh->win_atime[0];
5695 in->win_ctime[0] = oh->win_ctime[0];
5696 in->win_mtime[0] = oh->win_mtime[0];
5697 in->win_atime[1] = oh->win_atime[1];
5698 in->win_ctime[1] = oh->win_ctime[1];
5699 in->win_mtime[1] = oh->win_mtime[1];
5700 #else
5701 in->yst_uid = oh->yst_uid;
5702 in->yst_gid = oh->yst_gid;
5703 in->yst_atime = oh->yst_atime;
5704 in->yst_mtime = oh->yst_mtime;
5705 in->yst_ctime = oh->yst_ctime;
5706 in->yst_rdev = oh->yst_rdev;
5707 #endif
5708 in->chunkId = chunk;
5709
5710 yaffs_SetObjectName(in, oh->name);
5711 in->dirty = 0;
5712
5713 /* directory stuff...
5714 * hook up to parent
5715 */
5716
5717 parent =
5718 yaffs_FindOrCreateObjectByNumber
5719 (dev, oh->parentObjectId,
5720 YAFFS_OBJECT_TYPE_DIRECTORY);
5721 if (parent->variantType ==
5722 YAFFS_OBJECT_TYPE_UNKNOWN) {
5723 /* Set up as a directory */
5724 parent->variantType =
5725 YAFFS_OBJECT_TYPE_DIRECTORY;
5726 INIT_LIST_HEAD(&parent->variant.
5727 directoryVariant.
5728 children);
5729 } else if (parent->variantType !=
5730 YAFFS_OBJECT_TYPE_DIRECTORY)
5731 {
5732 /* Hoosterman, another problem....
5733 * We're trying to use a non-directory as a directory
5734 */
5735
5736 T(YAFFS_TRACE_ERROR,
5737 (TSTR
5738 ("yaffs tragedy: attempting to use non-directory as"
5739 " a directory in scan. Put in lost+found."
5740 TENDSTR)));
5741 parent = dev->lostNFoundDir;
5742 }
5743
5744 yaffs_AddObjectToDirectory(parent, in);
5745
5746 if (0 && (parent == dev->deletedDir ||
5747 parent == dev->unlinkedDir)) {
5748 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
5749 dev->nDeletedFiles++;
5750 }
5751 /* Note re hardlinks.
5752 * Since we might scan a hardlink before its equivalent object is scanned
5753 * we put them all in a list.
5754 * After scanning is complete, we should have all the objects, so we run through this
5755 * list and fix up all the chains.
5756 */
5757
5758 switch (in->variantType) {
5759 case YAFFS_OBJECT_TYPE_UNKNOWN:
5760 /* Todo got a problem */
5761 break;
5762 case YAFFS_OBJECT_TYPE_FILE:
5763 if (dev->isYaffs2
5764 && oh->isShrink) {
5765 /* Prune back the shrunken chunks */
5766 yaffs_PruneResizedChunks
5767 (in, oh->fileSize);
5768 /* Mark the block as having a shrinkHeader */
5769 bi->hasShrinkHeader = 1;
5770 }
5771
5772 if (dev->useHeaderFileSize)
5773
5774 in->variant.fileVariant.
5775 fileSize =
5776 oh->fileSize;
5777
5778 break;
5779 case YAFFS_OBJECT_TYPE_HARDLINK:
5780 in->variant.hardLinkVariant.
5781 equivalentObjectId =
5782 oh->equivalentObjectId;
5783 in->hardLinks.next =
5784 (struct list_head *)
5785 hardList;
5786 hardList = in;
5787 break;
5788 case YAFFS_OBJECT_TYPE_DIRECTORY:
5789 /* Do nothing */
5790 break;
5791 case YAFFS_OBJECT_TYPE_SPECIAL:
5792 /* Do nothing */
5793 break;
5794 case YAFFS_OBJECT_TYPE_SYMLINK:
5795 in->variant.symLinkVariant.alias =
5796 yaffs_CloneString(oh->alias);
5797 if(!in->variant.symLinkVariant.alias)
5798 alloc_failed = 1;
5799 break;
5800 }
5801
5802 if (parent == dev->deletedDir) {
5803 yaffs_DestroyObject(in);
5804 bi->hasShrinkHeader = 1;
5805 }
5806 }
5807 }
5808 }
5809
5810 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5811 /* If we got this far while scanning, then the block is fully allocated.*/
5812 state = YAFFS_BLOCK_STATE_FULL;
5813 }
5814
5815 bi->blockState = state;
5816
5817 /* Now let's see if it was dirty */
5818 if (bi->pagesInUse == 0 &&
5819 !bi->hasShrinkHeader &&
5820 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5821 yaffs_BlockBecameDirty(dev, blk);
5822 }
5823
5824 }
5825
5826 if (blockIndex) {
5827 YFREE(blockIndex);
5828 }
5829
5830
5831 /* Ok, we've done all the scanning.
5832 * Fix up the hard link chains.
5833 * We should now have scanned all the objects, now it's time to add these
5834 * hardlinks.
5835 */
5836
5837 yaffs_HardlinkFixup(dev,hardList);
5838
5839 /* Handle the unlinked files. Since they were left in an unlinked state we should
5840 * just delete them.
5841 */
5842 {
5843 struct list_head *i;
5844 struct list_head *n;
5845
5846 yaffs_Object *l;
5847 /* Soft delete all the unlinked files */
5848 list_for_each_safe(i, n,
5849 &dev->unlinkedDir->variant.directoryVariant.
5850 children) {
5851 if (i) {
5852 l = list_entry(i, yaffs_Object, siblings);
5853 yaffs_DestroyObject(l);
5854 }
5855 }
5856 }
5857
5858 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5859
5860 if(alloc_failed){
5861 return YAFFS_FAIL;
5862 }
5863
5864 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5865
5866
5867 return YAFFS_OK;
5868 }
5869
5870 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5871 {
5872 __u8 *chunkData;
5873 yaffs_ObjectHeader *oh;
5874 yaffs_Device *dev = in->myDev;
5875 yaffs_ExtendedTags tags;
5876 int result;
5877 int alloc_failed = 0;
5878
5879 if(!in)
5880 return;
5881
5882 #if 0
5883 T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
5884 in->objectId,
5885 in->lazyLoaded ? "not yet" : "already"));
5886 #endif
5887
5888 if(in->lazyLoaded){
5889 in->lazyLoaded = 0;
5890 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5891
5892 result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
5893 oh = (yaffs_ObjectHeader *) chunkData;
5894
5895 in->yst_mode = oh->yst_mode;
5896 #ifdef CONFIG_YAFFS_WINCE
5897 in->win_atime[0] = oh->win_atime[0];
5898 in->win_ctime[0] = oh->win_ctime[0];
5899 in->win_mtime[0] = oh->win_mtime[0];
5900 in->win_atime[1] = oh->win_atime[1];
5901 in->win_ctime[1] = oh->win_ctime[1];
5902 in->win_mtime[1] = oh->win_mtime[1];
5903 #else
5904 in->yst_uid = oh->yst_uid;
5905 in->yst_gid = oh->yst_gid;
5906 in->yst_atime = oh->yst_atime;
5907 in->yst_mtime = oh->yst_mtime;
5908 in->yst_ctime = oh->yst_ctime;
5909 in->yst_rdev = oh->yst_rdev;
5910
5911 #endif
5912 yaffs_SetObjectName(in, oh->name);
5913
5914 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
5915 in->variant.symLinkVariant.alias =
5916 yaffs_CloneString(oh->alias);
5917 if(!in->variant.symLinkVariant.alias)
5918 alloc_failed = 1; /* Not returned to caller */
5919 }
5920
5921 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
5922 }
5923 }
5924
5925 static int yaffs_ScanBackwards(yaffs_Device * dev)
5926 {
5927 yaffs_ExtendedTags tags;
5928 int blk;
5929 int blockIterator;
5930 int startIterator;
5931 int endIterator;
5932 int nBlocksToScan = 0;
5933
5934 int chunk;
5935 int result;
5936 int c;
5937 int deleted;
5938 yaffs_BlockState state;
5939 yaffs_Object *hardList = NULL;
5940 yaffs_BlockInfo *bi;
5941 int sequenceNumber;
5942 yaffs_ObjectHeader *oh;
5943 yaffs_Object *in;
5944 yaffs_Object *parent;
5945 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5946 int itsUnlinked;
5947 __u8 *chunkData;
5948
5949 int fileSize;
5950 int isShrink;
5951 int foundChunksInBlock;
5952 int equivalentObjectId;
5953 int alloc_failed = 0;
5954
5955
5956 yaffs_BlockIndex *blockIndex = NULL;
5957 int altBlockIndex = 0;
5958
5959 if (!dev->isYaffs2) {
5960 T(YAFFS_TRACE_SCAN,
5961 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5962 return YAFFS_FAIL;
5963 }
5964
5965 T(YAFFS_TRACE_SCAN,
5966 (TSTR
5967 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
5968 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5969
5970
5971 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5972
5973 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5974
5975 if(!blockIndex) {
5976 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
5977 altBlockIndex = 1;
5978 }
5979
5980 if(!blockIndex) {
5981 T(YAFFS_TRACE_SCAN,
5982 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
5983 return YAFFS_FAIL;
5984 }
5985
5986 dev->blocksInCheckpoint = 0;
5987
5988 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5989
5990 /* Scan all the blocks to determine their state */
5991 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5992 bi = yaffs_GetBlockInfo(dev, blk);
5993 yaffs_ClearChunkBits(dev, blk);
5994 bi->pagesInUse = 0;
5995 bi->softDeletions = 0;
5996
5997 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5998
5999 bi->blockState = state;
6000 bi->sequenceNumber = sequenceNumber;
6001
6002 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6003 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6004
6005 T(YAFFS_TRACE_SCAN_DEBUG,
6006 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6007 state, sequenceNumber));
6008
6009
6010 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
6011 dev->blocksInCheckpoint++;
6012
6013 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6014 T(YAFFS_TRACE_BAD_BLOCKS,
6015 (TSTR("block %d is bad" TENDSTR), blk));
6016 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6017 T(YAFFS_TRACE_SCAN_DEBUG,
6018 (TSTR("Block empty " TENDSTR)));
6019 dev->nErasedBlocks++;
6020 dev->nFreeChunks += dev->nChunksPerBlock;
6021 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6022
6023 /* Determine the highest sequence number */
6024 if (dev->isYaffs2 &&
6025 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6026 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6027
6028 blockIndex[nBlocksToScan].seq = sequenceNumber;
6029 blockIndex[nBlocksToScan].block = blk;
6030
6031 nBlocksToScan++;
6032
6033 if (sequenceNumber >= dev->sequenceNumber) {
6034 dev->sequenceNumber = sequenceNumber;
6035 }
6036 } else if (dev->isYaffs2) {
6037 /* TODO: Nasty sequence number! */
6038 T(YAFFS_TRACE_SCAN,
6039 (TSTR
6040 ("Block scanning block %d has bad sequence number %d"
6041 TENDSTR), blk, sequenceNumber));
6042
6043 }
6044 }
6045 }
6046
6047 T(YAFFS_TRACE_SCAN,
6048 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6049
6050
6051
6052 YYIELD();
6053
6054 /* Sort the blocks */
6055 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6056 yaffs_qsort(blockIndex, nBlocksToScan,
6057 sizeof(yaffs_BlockIndex), ybicmp);
6058 #else
6059 {
6060 /* Dungy old bubble sort... */
6061
6062 yaffs_BlockIndex temp;
6063 int i;
6064 int j;
6065
6066 for (i = 0; i < nBlocksToScan; i++)
6067 for (j = i + 1; j < nBlocksToScan; j++)
6068 if (blockIndex[i].seq > blockIndex[j].seq) {
6069 temp = blockIndex[j];
6070 blockIndex[j] = blockIndex[i];
6071 blockIndex[i] = temp;
6072 }
6073 }
6074 #endif
6075
6076 YYIELD();
6077
6078 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6079
6080 /* Now scan the blocks looking at the data. */
6081 startIterator = 0;
6082 endIterator = nBlocksToScan - 1;
6083 T(YAFFS_TRACE_SCAN_DEBUG,
6084 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6085
6086 /* For each block.... backwards */
6087 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6088 blockIterator--) {
6089 /* Cooperative multitasking! This loop can run for so
6090 long that watchdog timers expire. */
6091 YYIELD();
6092
6093 /* get the block to scan in the correct order */
6094 blk = blockIndex[blockIterator].block;
6095
6096 bi = yaffs_GetBlockInfo(dev, blk);
6097
6098
6099 state = bi->blockState;
6100
6101 deleted = 0;
6102
6103 /* For each chunk in each block that needs scanning.... */
6104 foundChunksInBlock = 0;
6105 for (c = dev->nChunksPerBlock - 1;
6106 !alloc_failed && c >= 0 &&
6107 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6108 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6109 /* Scan backwards...
6110 * Read the tags and decide what to do
6111 */
6112
6113 chunk = blk * dev->nChunksPerBlock + c;
6114
6115 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6116 &tags);
6117
6118 /* Let's have a good look at this chunk... */
6119
6120 if (!tags.chunkUsed) {
6121 /* An unassigned chunk in the block.
6122 * If there are used chunks after this one, then
6123 * it is a chunk that was skipped due to failing the erased
6124 * check. Just skip it so that it can be deleted.
6125 * But, more typically, We get here when this is an unallocated
6126 * chunk and his means that either the block is empty or
6127 * this is the one being allocated from
6128 */
6129
6130 if(foundChunksInBlock)
6131 {
6132 /* This is a chunk that was skipped due to failing the erased check */
6133
6134 } else if (c == 0) {
6135 /* We're looking at the first chunk in the block so the block is unused */
6136 state = YAFFS_BLOCK_STATE_EMPTY;
6137 dev->nErasedBlocks++;
6138 } else {
6139 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6140 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6141 if(dev->sequenceNumber == bi->sequenceNumber) {
6142 /* this is the block being allocated from */
6143
6144 T(YAFFS_TRACE_SCAN,
6145 (TSTR
6146 (" Allocating from %d %d"
6147 TENDSTR), blk, c));
6148
6149 state = YAFFS_BLOCK_STATE_ALLOCATING;
6150 dev->allocationBlock = blk;
6151 dev->allocationPage = c;
6152 dev->allocationBlockFinder = blk;
6153 }
6154 else {
6155 /* This is a partially written block that is not
6156 * the current allocation block. This block must have
6157 * had a write failure, so set up for retirement.
6158 */
6159
6160 bi->needsRetiring = 1;
6161 bi->gcPrioritise = 1;
6162
6163 T(YAFFS_TRACE_ALWAYS,
6164 (TSTR("Partially written block %d being set for retirement" TENDSTR),
6165 blk));
6166 }
6167
6168 }
6169
6170 }
6171
6172 dev->nFreeChunks++;
6173
6174 } else if (tags.chunkId > 0) {
6175 /* chunkId > 0 so it is a data chunk... */
6176 unsigned int endpos;
6177 __u32 chunkBase =
6178 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6179
6180 foundChunksInBlock = 1;
6181
6182
6183 yaffs_SetChunkBit(dev, blk, c);
6184 bi->pagesInUse++;
6185
6186 in = yaffs_FindOrCreateObjectByNumber(dev,
6187 tags.
6188 objectId,
6189 YAFFS_OBJECT_TYPE_FILE);
6190 if(!in){
6191 /* Out of memory */
6192 alloc_failed = 1;
6193 }
6194
6195 if (in &&
6196 in->variantType == YAFFS_OBJECT_TYPE_FILE
6197 && chunkBase <
6198 in->variant.fileVariant.shrinkSize) {
6199 /* This has not been invalidated by a resize */
6200 if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
6201 chunk, -1)){
6202 alloc_failed = 1;
6203 }
6204
6205 /* File size is calculated by looking at the data chunks if we have not
6206 * seen an object header yet. Stop this practice once we find an object header.
6207 */
6208 endpos =
6209 (tags.chunkId -
6210 1) * dev->nDataBytesPerChunk +
6211 tags.byteCount;
6212
6213 if (!in->valid && /* have not got an object header yet */
6214 in->variant.fileVariant.
6215 scannedFileSize < endpos) {
6216 in->variant.fileVariant.
6217 scannedFileSize = endpos;
6218 in->variant.fileVariant.
6219 fileSize =
6220 in->variant.fileVariant.
6221 scannedFileSize;
6222 }
6223
6224 } else if(in) {
6225 /* This chunk has been invalidated by a resize, so delete */
6226 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6227
6228 }
6229 } else {
6230 /* chunkId == 0, so it is an ObjectHeader.
6231 * Thus, we read in the object header and make the object
6232 */
6233 foundChunksInBlock = 1;
6234
6235 yaffs_SetChunkBit(dev, blk, c);
6236 bi->pagesInUse++;
6237
6238 oh = NULL;
6239 in = NULL;
6240
6241 if (tags.extraHeaderInfoAvailable) {
6242 in = yaffs_FindOrCreateObjectByNumber
6243 (dev, tags.objectId,
6244 tags.extraObjectType);
6245 }
6246
6247 if (!in ||
6248 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6249 !in->valid ||
6250 #endif
6251 tags.extraShadows ||
6252 (!in->valid &&
6253 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6254 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
6255 ) {
6256
6257 /* If we don't have valid info then we need to read the chunk
6258 * TODO In future we can probably defer reading the chunk and
6259 * living with invalid data until needed.
6260 */
6261
6262 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6263 chunk,
6264 chunkData,
6265 NULL);
6266
6267 oh = (yaffs_ObjectHeader *) chunkData;
6268
6269 if (!in)
6270 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6271
6272 }
6273
6274 if (!in) {
6275 /* TODO Hoosterman we have a problem! */
6276 T(YAFFS_TRACE_ERROR,
6277 (TSTR
6278 ("yaffs tragedy: Could not make object for object %d "
6279 "at chunk %d during scan"
6280 TENDSTR), tags.objectId, chunk));
6281
6282 }
6283
6284 if (in->valid) {
6285 /* We have already filled this one.
6286 * We have a duplicate that will be discarded, but
6287 * we first have to suck out resize info if it is a file.
6288 */
6289
6290 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6291 ((oh &&
6292 oh-> type == YAFFS_OBJECT_TYPE_FILE)||
6293 (tags.extraHeaderInfoAvailable &&
6294 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
6295 ) {
6296 __u32 thisSize =
6297 (oh) ? oh->fileSize : tags.
6298 extraFileLength;
6299 __u32 parentObjectId =
6300 (oh) ? oh->
6301 parentObjectId : tags.
6302 extraParentObjectId;
6303 unsigned isShrink =
6304 (oh) ? oh->isShrink : tags.
6305 extraIsShrinkHeader;
6306
6307 /* If it is deleted (unlinked at start also means deleted)
6308 * we treat the file size as being zeroed at this point.
6309 */
6310 if (parentObjectId ==
6311 YAFFS_OBJECTID_DELETED
6312 || parentObjectId ==
6313 YAFFS_OBJECTID_UNLINKED) {
6314 thisSize = 0;
6315 isShrink = 1;
6316 }
6317
6318 if (isShrink &&
6319 in->variant.fileVariant.
6320 shrinkSize > thisSize) {
6321 in->variant.fileVariant.
6322 shrinkSize =
6323 thisSize;
6324 }
6325
6326 if (isShrink) {
6327 bi->hasShrinkHeader = 1;
6328 }
6329
6330 }
6331 /* Use existing - destroy this one. */
6332 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6333
6334 }
6335
6336 if (!in->valid &&
6337 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6338 tags.objectId ==
6339 YAFFS_OBJECTID_LOSTNFOUND)) {
6340 /* We only load some info, don't fiddle with directory structure */
6341 in->valid = 1;
6342
6343 if(oh) {
6344 in->variantType = oh->type;
6345
6346 in->yst_mode = oh->yst_mode;
6347 #ifdef CONFIG_YAFFS_WINCE
6348 in->win_atime[0] = oh->win_atime[0];
6349 in->win_ctime[0] = oh->win_ctime[0];
6350 in->win_mtime[0] = oh->win_mtime[0];
6351 in->win_atime[1] = oh->win_atime[1];
6352 in->win_ctime[1] = oh->win_ctime[1];
6353 in->win_mtime[1] = oh->win_mtime[1];
6354 #else
6355 in->yst_uid = oh->yst_uid;
6356 in->yst_gid = oh->yst_gid;
6357 in->yst_atime = oh->yst_atime;
6358 in->yst_mtime = oh->yst_mtime;
6359 in->yst_ctime = oh->yst_ctime;
6360 in->yst_rdev = oh->yst_rdev;
6361
6362 #endif
6363 } else {
6364 in->variantType = tags.extraObjectType;
6365 in->lazyLoaded = 1;
6366 }
6367
6368 in->chunkId = chunk;
6369
6370 } else if (!in->valid) {
6371 /* we need to load this info */
6372
6373 in->valid = 1;
6374 in->chunkId = chunk;
6375
6376 if(oh) {
6377 in->variantType = oh->type;
6378
6379 in->yst_mode = oh->yst_mode;
6380 #ifdef CONFIG_YAFFS_WINCE
6381 in->win_atime[0] = oh->win_atime[0];
6382 in->win_ctime[0] = oh->win_ctime[0];
6383 in->win_mtime[0] = oh->win_mtime[0];
6384 in->win_atime[1] = oh->win_atime[1];
6385 in->win_ctime[1] = oh->win_ctime[1];
6386 in->win_mtime[1] = oh->win_mtime[1];
6387 #else
6388 in->yst_uid = oh->yst_uid;
6389 in->yst_gid = oh->yst_gid;
6390 in->yst_atime = oh->yst_atime;
6391 in->yst_mtime = oh->yst_mtime;
6392 in->yst_ctime = oh->yst_ctime;
6393 in->yst_rdev = oh->yst_rdev;
6394 #endif
6395
6396 if (oh->shadowsObject > 0)
6397 yaffs_HandleShadowedObject(dev,
6398 oh->
6399 shadowsObject,
6400 1);
6401
6402
6403 yaffs_SetObjectName(in, oh->name);
6404 parent =
6405 yaffs_FindOrCreateObjectByNumber
6406 (dev, oh->parentObjectId,
6407 YAFFS_OBJECT_TYPE_DIRECTORY);
6408
6409 fileSize = oh->fileSize;
6410 isShrink = oh->isShrink;
6411 equivalentObjectId = oh->equivalentObjectId;
6412
6413 }
6414 else {
6415 in->variantType = tags.extraObjectType;
6416 parent =
6417 yaffs_FindOrCreateObjectByNumber
6418 (dev, tags.extraParentObjectId,
6419 YAFFS_OBJECT_TYPE_DIRECTORY);
6420 fileSize = tags.extraFileLength;
6421 isShrink = tags.extraIsShrinkHeader;
6422 equivalentObjectId = tags.extraEquivalentObjectId;
6423 in->lazyLoaded = 1;
6424
6425 }
6426 in->dirty = 0;
6427
6428 /* directory stuff...
6429 * hook up to parent
6430 */
6431
6432 if (parent->variantType ==
6433 YAFFS_OBJECT_TYPE_UNKNOWN) {
6434 /* Set up as a directory */
6435 parent->variantType =
6436 YAFFS_OBJECT_TYPE_DIRECTORY;
6437 INIT_LIST_HEAD(&parent->variant.
6438 directoryVariant.
6439 children);
6440 } else if (parent->variantType !=
6441 YAFFS_OBJECT_TYPE_DIRECTORY)
6442 {
6443 /* Hoosterman, another problem....
6444 * We're trying to use a non-directory as a directory
6445 */
6446
6447 T(YAFFS_TRACE_ERROR,
6448 (TSTR
6449 ("yaffs tragedy: attempting to use non-directory as"
6450 " a directory in scan. Put in lost+found."
6451 TENDSTR)));
6452 parent = dev->lostNFoundDir;
6453 }
6454
6455 yaffs_AddObjectToDirectory(parent, in);
6456
6457 itsUnlinked = (parent == dev->deletedDir) ||
6458 (parent == dev->unlinkedDir);
6459
6460 if (isShrink) {
6461 /* Mark the block as having a shrinkHeader */
6462 bi->hasShrinkHeader = 1;
6463 }
6464
6465 /* Note re hardlinks.
6466 * Since we might scan a hardlink before its equivalent object is scanned
6467 * we put them all in a list.
6468 * After scanning is complete, we should have all the objects, so we run
6469 * through this list and fix up all the chains.
6470 */
6471
6472 switch (in->variantType) {
6473 case YAFFS_OBJECT_TYPE_UNKNOWN:
6474 /* Todo got a problem */
6475 break;
6476 case YAFFS_OBJECT_TYPE_FILE:
6477
6478 if (in->variant.fileVariant.
6479 scannedFileSize < fileSize) {
6480 /* This covers the case where the file size is greater
6481 * than where the data is
6482 * This will happen if the file is resized to be larger
6483 * than its current data extents.
6484 */
6485 in->variant.fileVariant.fileSize = fileSize;
6486 in->variant.fileVariant.scannedFileSize =
6487 in->variant.fileVariant.fileSize;
6488 }
6489
6490 if (isShrink &&
6491 in->variant.fileVariant.shrinkSize > fileSize) {
6492 in->variant.fileVariant.shrinkSize = fileSize;
6493 }
6494
6495 break;
6496 case YAFFS_OBJECT_TYPE_HARDLINK:
6497 if(!itsUnlinked) {
6498 in->variant.hardLinkVariant.equivalentObjectId =
6499 equivalentObjectId;
6500 in->hardLinks.next =
6501 (struct list_head *) hardList;
6502 hardList = in;
6503 }
6504 break;
6505 case YAFFS_OBJECT_TYPE_DIRECTORY:
6506 /* Do nothing */
6507 break;
6508 case YAFFS_OBJECT_TYPE_SPECIAL:
6509 /* Do nothing */
6510 break;
6511 case YAFFS_OBJECT_TYPE_SYMLINK:
6512 if(oh){
6513 in->variant.symLinkVariant.alias =
6514 yaffs_CloneString(oh->
6515 alias);
6516 if(!in->variant.symLinkVariant.alias)
6517 alloc_failed = 1;
6518 }
6519 break;
6520 }
6521
6522 }
6523
6524 }
6525
6526 } /* End of scanning for each chunk */
6527
6528 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6529 /* If we got this far while scanning, then the block is fully allocated. */
6530 state = YAFFS_BLOCK_STATE_FULL;
6531 }
6532
6533 bi->blockState = state;
6534
6535 /* Now let's see if it was dirty */
6536 if (bi->pagesInUse == 0 &&
6537 !bi->hasShrinkHeader &&
6538 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6539 yaffs_BlockBecameDirty(dev, blk);
6540 }
6541
6542 }
6543
6544 if (altBlockIndex)
6545 YFREE_ALT(blockIndex);
6546 else
6547 YFREE(blockIndex);
6548
6549 /* Ok, we've done all the scanning.
6550 * Fix up the hard link chains.
6551 * We should now have scanned all the objects, now it's time to add these
6552 * hardlinks.
6553 */
6554 yaffs_HardlinkFixup(dev,hardList);
6555
6556
6557 /*
6558 * Sort out state of unlinked and deleted objects.
6559 */
6560 {
6561 struct list_head *i;
6562 struct list_head *n;
6563
6564 yaffs_Object *l;
6565
6566 /* Soft delete all the unlinked files */
6567 list_for_each_safe(i, n,
6568 &dev->unlinkedDir->variant.directoryVariant.
6569 children) {
6570 if (i) {
6571 l = list_entry(i, yaffs_Object, siblings);
6572 yaffs_DestroyObject(l);
6573 }
6574 }
6575
6576 /* Soft delete all the deletedDir files */
6577 list_for_each_safe(i, n,
6578 &dev->deletedDir->variant.directoryVariant.
6579 children) {
6580 if (i) {
6581 l = list_entry(i, yaffs_Object, siblings);
6582 yaffs_DestroyObject(l);
6583
6584 }
6585 }
6586 }
6587
6588 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6589
6590 if(alloc_failed){
6591 return YAFFS_FAIL;
6592 }
6593
6594 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6595
6596 return YAFFS_OK;
6597 }
6598
6599 /*------------------------------ Directory Functions ----------------------------- */
6600
6601 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
6602 {
6603 yaffs_Device *dev = obj->myDev;
6604
6605 if(dev && dev->removeObjectCallback)
6606 dev->removeObjectCallback(obj);
6607
6608 list_del_init(&obj->siblings);
6609 obj->parent = NULL;
6610 }
6611
6612
6613 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
6614 yaffs_Object * obj)
6615 {
6616
6617 if (!directory) {
6618 T(YAFFS_TRACE_ALWAYS,
6619 (TSTR
6620 ("tragedy: Trying to add an object to a null pointer directory"
6621 TENDSTR)));
6622 YBUG();
6623 }
6624 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6625 T(YAFFS_TRACE_ALWAYS,
6626 (TSTR
6627 ("tragedy: Trying to add an object to a non-directory"
6628 TENDSTR)));
6629 YBUG();
6630 }
6631
6632 if (obj->siblings.prev == NULL) {
6633 /* Not initialised */
6634 INIT_LIST_HEAD(&obj->siblings);
6635
6636 } else if (!list_empty(&obj->siblings)) {
6637 /* If it is holed up somewhere else, un hook it */
6638 yaffs_RemoveObjectFromDirectory(obj);
6639 }
6640 /* Now add it */
6641 list_add(&obj->siblings, &directory->variant.directoryVariant.children);
6642 obj->parent = directory;
6643
6644 if (directory == obj->myDev->unlinkedDir
6645 || directory == obj->myDev->deletedDir) {
6646 obj->unlinked = 1;
6647 obj->myDev->nUnlinkedFiles++;
6648 obj->renameAllowed = 0;
6649 }
6650 }
6651
6652 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
6653 const YCHAR * name)
6654 {
6655 int sum;
6656
6657 struct list_head *i;
6658 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6659
6660 yaffs_Object *l;
6661
6662 if (!name) {
6663 return NULL;
6664 }
6665
6666 if (!directory) {
6667 T(YAFFS_TRACE_ALWAYS,
6668 (TSTR
6669 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6670 TENDSTR)));
6671 YBUG();
6672 }
6673 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6674 T(YAFFS_TRACE_ALWAYS,
6675 (TSTR
6676 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6677 YBUG();
6678 }
6679
6680 sum = yaffs_CalcNameSum(name);
6681
6682 list_for_each(i, &directory->variant.directoryVariant.children) {
6683 if (i) {
6684 l = list_entry(i, yaffs_Object, siblings);
6685
6686 yaffs_CheckObjectDetailsLoaded(l);
6687
6688 /* Special case for lost-n-found */
6689 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6690 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
6691 return l;
6692 }
6693 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
6694 {
6695 /* LostnFound cunk called Objxxx
6696 * Do a real check
6697 */
6698 yaffs_GetObjectName(l, buffer,
6699 YAFFS_MAX_NAME_LENGTH);
6700 if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
6701 return l;
6702 }
6703
6704 }
6705 }
6706 }
6707
6708 return NULL;
6709 }
6710
6711
6712 #if 0
6713 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
6714 int (*fn) (yaffs_Object *))
6715 {
6716 struct list_head *i;
6717 yaffs_Object *l;
6718
6719 if (!theDir) {
6720 T(YAFFS_TRACE_ALWAYS,
6721 (TSTR
6722 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6723 TENDSTR)));
6724 YBUG();
6725 }
6726 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6727 T(YAFFS_TRACE_ALWAYS,
6728 (TSTR
6729 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6730 YBUG();
6731 }
6732
6733 list_for_each(i, &theDir->variant.directoryVariant.children) {
6734 if (i) {
6735 l = list_entry(i, yaffs_Object, siblings);
6736 if (l && !fn(l)) {
6737 return YAFFS_FAIL;
6738 }
6739 }
6740 }
6741
6742 return YAFFS_OK;
6743
6744 }
6745 #endif
6746
6747 /* GetEquivalentObject dereferences any hard links to get to the
6748 * actual object.
6749 */
6750
6751 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
6752 {
6753 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6754 /* We want the object id of the equivalent object, not this one */
6755 obj = obj->variant.hardLinkVariant.equivalentObject;
6756 yaffs_CheckObjectDetailsLoaded(obj);
6757 }
6758 return obj;
6759
6760 }
6761
6762 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
6763 {
6764 memset(name, 0, buffSize * sizeof(YCHAR));
6765
6766 yaffs_CheckObjectDetailsLoaded(obj);
6767
6768 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6769 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6770 } else if (obj->chunkId <= 0) {
6771 YCHAR locName[20];
6772 /* make up a name */
6773 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
6774 obj->objectId);
6775 yaffs_strncpy(name, locName, buffSize - 1);
6776
6777 }
6778 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6779 else if (obj->shortName[0]) {
6780 yaffs_strcpy(name, obj->shortName);
6781 }
6782 #endif
6783 else {
6784 int result;
6785 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6786
6787 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6788
6789 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6790
6791 if (obj->chunkId >= 0) {
6792 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6793 obj->chunkId, buffer,
6794 NULL);
6795 }
6796 yaffs_strncpy(name, oh->name, buffSize - 1);
6797
6798 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6799 }
6800
6801 return yaffs_strlen(name);
6802 }
6803
6804 int yaffs_GetObjectFileLength(yaffs_Object * obj)
6805 {
6806
6807 /* Dereference any hard linking */
6808 obj = yaffs_GetEquivalentObject(obj);
6809
6810 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
6811 return obj->variant.fileVariant.fileSize;
6812 }
6813 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6814 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6815 } else {
6816 /* Only a directory should drop through to here */
6817 return obj->myDev->nDataBytesPerChunk;
6818 }
6819 }
6820
6821 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
6822 {
6823 int count = 0;
6824 struct list_head *i;
6825
6826 if (!obj->unlinked) {
6827 count++; /* the object itself */
6828 }
6829 list_for_each(i, &obj->hardLinks) {
6830 count++; /* add the hard links; */
6831 }
6832 return count;
6833
6834 }
6835
6836 int yaffs_GetObjectInode(yaffs_Object * obj)
6837 {
6838 obj = yaffs_GetEquivalentObject(obj);
6839
6840 return obj->objectId;
6841 }
6842
6843 unsigned yaffs_GetObjectType(yaffs_Object * obj)
6844 {
6845 obj = yaffs_GetEquivalentObject(obj);
6846
6847 switch (obj->variantType) {
6848 case YAFFS_OBJECT_TYPE_FILE:
6849 return DT_REG;
6850 break;
6851 case YAFFS_OBJECT_TYPE_DIRECTORY:
6852 return DT_DIR;
6853 break;
6854 case YAFFS_OBJECT_TYPE_SYMLINK:
6855 return DT_LNK;
6856 break;
6857 case YAFFS_OBJECT_TYPE_HARDLINK:
6858 return DT_REG;
6859 break;
6860 case YAFFS_OBJECT_TYPE_SPECIAL:
6861 if (S_ISFIFO(obj->yst_mode))
6862 return DT_FIFO;
6863 if (S_ISCHR(obj->yst_mode))
6864 return DT_CHR;
6865 if (S_ISBLK(obj->yst_mode))
6866 return DT_BLK;
6867 if (S_ISSOCK(obj->yst_mode))
6868 return DT_SOCK;
6869 default:
6870 return DT_REG;
6871 break;
6872 }
6873 }
6874
6875 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
6876 {
6877 obj = yaffs_GetEquivalentObject(obj);
6878 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6879 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
6880 } else {
6881 return yaffs_CloneString(_Y(""));
6882 }
6883 }
6884
6885 #ifndef CONFIG_YAFFS_WINCE
6886
6887 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
6888 {
6889 unsigned int valid = attr->ia_valid;
6890
6891 if (valid & ATTR_MODE)
6892 obj->yst_mode = attr->ia_mode;
6893 if (valid & ATTR_UID)
6894 obj->yst_uid = attr->ia_uid;
6895 if (valid & ATTR_GID)
6896 obj->yst_gid = attr->ia_gid;
6897
6898 if (valid & ATTR_ATIME)
6899 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
6900 if (valid & ATTR_CTIME)
6901 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
6902 if (valid & ATTR_MTIME)
6903 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
6904
6905 if (valid & ATTR_SIZE)
6906 yaffs_ResizeFile(obj, attr->ia_size);
6907
6908 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6909
6910 return YAFFS_OK;
6911
6912 }
6913 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
6914 {
6915 unsigned int valid = 0;
6916
6917 attr->ia_mode = obj->yst_mode;
6918 valid |= ATTR_MODE;
6919 attr->ia_uid = obj->yst_uid;
6920 valid |= ATTR_UID;
6921 attr->ia_gid = obj->yst_gid;
6922 valid |= ATTR_GID;
6923
6924 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
6925 valid |= ATTR_ATIME;
6926 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
6927 valid |= ATTR_CTIME;
6928 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
6929 valid |= ATTR_MTIME;
6930
6931 attr->ia_size = yaffs_GetFileSize(obj);
6932 valid |= ATTR_SIZE;
6933
6934 attr->ia_valid = valid;
6935
6936 return YAFFS_OK;
6937
6938 }
6939
6940 #endif
6941
6942 #if 0
6943 int yaffs_DumpObject(yaffs_Object * obj)
6944 {
6945 YCHAR name[257];
6946
6947 yaffs_GetObjectName(obj, name, 256);
6948
6949 T(YAFFS_TRACE_ALWAYS,
6950 (TSTR
6951 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
6952 " chunk %d type %d size %d\n"
6953 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
6954 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
6955 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
6956
6957 return YAFFS_OK;
6958 }
6959 #endif
6960
6961 /*---------------------------- Initialisation code -------------------------------------- */
6962
6963 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
6964 {
6965
6966 /* Common functions, gotta have */
6967 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
6968 return 0;
6969
6970 #ifdef CONFIG_YAFFS_YAFFS2
6971
6972 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
6973 if (dev->writeChunkWithTagsToNAND &&
6974 dev->readChunkWithTagsFromNAND &&
6975 !dev->writeChunkToNAND &&
6976 !dev->readChunkFromNAND &&
6977 dev->markNANDBlockBad && dev->queryNANDBlock)
6978 return 1;
6979 #endif
6980
6981 /* Can use the "spare" style interface for yaffs1 */
6982 if (!dev->isYaffs2 &&
6983 !dev->writeChunkWithTagsToNAND &&
6984 !dev->readChunkWithTagsFromNAND &&
6985 dev->writeChunkToNAND &&
6986 dev->readChunkFromNAND &&
6987 !dev->markNANDBlockBad && !dev->queryNANDBlock)
6988 return 1;
6989
6990 return 0; /* bad */
6991 }
6992
6993
6994 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
6995 {
6996 /* Initialise the unlinked, deleted, root and lost and found directories */
6997
6998 dev->lostNFoundDir = dev->rootDir = NULL;
6999 dev->unlinkedDir = dev->deletedDir = NULL;
7000
7001 dev->unlinkedDir =
7002 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7003
7004 dev->deletedDir =
7005 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7006
7007 dev->rootDir =
7008 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7009 YAFFS_ROOT_MODE | S_IFDIR);
7010 dev->lostNFoundDir =
7011 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7012 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7013
7014 if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
7015 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7016 return YAFFS_OK;
7017 }
7018
7019 return YAFFS_FAIL;
7020 }
7021
7022 int yaffs_GutsInitialise(yaffs_Device * dev)
7023 {
7024 int init_failed = 0;
7025 unsigned x;
7026 int bits;
7027
7028 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7029
7030 /* Check stuff that must be set */
7031
7032 if (!dev) {
7033 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7034 return YAFFS_FAIL;
7035 }
7036
7037 dev->internalStartBlock = dev->startBlock;
7038 dev->internalEndBlock = dev->endBlock;
7039 dev->blockOffset = 0;
7040 dev->chunkOffset = 0;
7041 dev->nFreeChunks = 0;
7042
7043 if (dev->startBlock == 0) {
7044 dev->internalStartBlock = dev->startBlock + 1;
7045 dev->internalEndBlock = dev->endBlock + 1;
7046 dev->blockOffset = 1;
7047 dev->chunkOffset = dev->nChunksPerBlock;
7048 }
7049
7050 /* Check geometry parameters. */
7051
7052 if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
7053 (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
7054 dev->nChunksPerBlock < 2 ||
7055 dev->nReservedBlocks < 2 ||
7056 dev->internalStartBlock <= 0 ||
7057 dev->internalEndBlock <= 0 ||
7058 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
7059 ) {
7060 T(YAFFS_TRACE_ALWAYS,
7061 (TSTR
7062 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
7063 TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
7064 return YAFFS_FAIL;
7065 }
7066
7067 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7068 T(YAFFS_TRACE_ALWAYS,
7069 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7070 return YAFFS_FAIL;
7071 }
7072
7073 /* Got the right mix of functions? */
7074 if (!yaffs_CheckDevFunctions(dev)) {
7075 /* Function missing */
7076 T(YAFFS_TRACE_ALWAYS,
7077 (TSTR
7078 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7079
7080 return YAFFS_FAIL;
7081 }
7082
7083 /* This is really a compilation check. */
7084 if (!yaffs_CheckStructures()) {
7085 T(YAFFS_TRACE_ALWAYS,
7086 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7087 return YAFFS_FAIL;
7088 }
7089
7090 if (dev->isMounted) {
7091 T(YAFFS_TRACE_ALWAYS,
7092 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7093 return YAFFS_FAIL;
7094 }
7095
7096 /* Finished with most checks. One or two more checks happen later on too. */
7097
7098 dev->isMounted = 1;
7099
7100
7101
7102 /* OK now calculate a few things for the device */
7103
7104 /*
7105 * Calculate all the chunk size manipulation numbers:
7106 */
7107 /* Start off assuming it is a power of 2 */
7108 dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
7109 dev->chunkMask = (1<<dev->chunkShift) - 1;
7110
7111 if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
7112 /* Yes it is a power of 2, disable crumbs */
7113 dev->crumbMask = 0;
7114 dev->crumbShift = 0;
7115 dev->crumbsPerChunk = 0;
7116 } else {
7117 /* Not a power of 2, use crumbs instead */
7118 dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
7119 dev->crumbMask = (1<<dev->crumbShift)-1;
7120 dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
7121 dev->chunkShift = 0;
7122 dev->chunkMask = 0;
7123 }
7124
7125
7126 /*
7127 * Calculate chunkGroupBits.
7128 * We need to find the next power of 2 > than internalEndBlock
7129 */
7130
7131 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7132
7133 bits = ShiftsGE(x);
7134
7135 /* Set up tnode width if wide tnodes are enabled. */
7136 if(!dev->wideTnodesDisabled){
7137 /* bits must be even so that we end up with 32-bit words */
7138 if(bits & 1)
7139 bits++;
7140 if(bits < 16)
7141 dev->tnodeWidth = 16;
7142 else
7143 dev->tnodeWidth = bits;
7144 }
7145 else
7146 dev->tnodeWidth = 16;
7147
7148 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7149
7150 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7151 * so if the bitwidth of the
7152 * chunk range we're using is greater than 16 we need
7153 * to figure out chunk shift and chunkGroupSize
7154 */
7155
7156 if (bits <= dev->tnodeWidth)
7157 dev->chunkGroupBits = 0;
7158 else
7159 dev->chunkGroupBits = bits - dev->tnodeWidth;
7160
7161
7162 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7163
7164 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7165 /* We have a problem because the soft delete won't work if
7166 * the chunk group size > chunks per block.
7167 * This can be remedied by using larger "virtual blocks".
7168 */
7169 T(YAFFS_TRACE_ALWAYS,
7170 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7171
7172 return YAFFS_FAIL;
7173 }
7174
7175 /* OK, we've finished verifying the device, lets continue with initialisation */
7176
7177 /* More device initialisation */
7178 dev->garbageCollections = 0;
7179 dev->passiveGarbageCollections = 0;
7180 dev->currentDirtyChecker = 0;
7181 dev->bufferedBlock = -1;
7182 dev->doingBufferedBlockRewrite = 0;
7183 dev->nDeletedFiles = 0;
7184 dev->nBackgroundDeletions = 0;
7185 dev->nUnlinkedFiles = 0;
7186 dev->eccFixed = 0;
7187 dev->eccUnfixed = 0;
7188 dev->tagsEccFixed = 0;
7189 dev->tagsEccUnfixed = 0;
7190 dev->nErasureFailures = 0;
7191 dev->nErasedBlocks = 0;
7192 dev->isDoingGC = 0;
7193 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7194
7195 /* Initialise temporary buffers and caches. */
7196 if(!yaffs_InitialiseTempBuffers(dev))
7197 init_failed = 1;
7198
7199 dev->srCache = NULL;
7200 dev->gcCleanupList = NULL;
7201
7202
7203 if (!init_failed &&
7204 dev->nShortOpCaches > 0) {
7205 int i;
7206 __u8 *buf;
7207 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7208
7209 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
7210 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7211 }
7212
7213 buf = dev->srCache = YMALLOC(srCacheBytes);
7214
7215 if(dev->srCache)
7216 memset(dev->srCache,0,srCacheBytes);
7217
7218 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7219 dev->srCache[i].object = NULL;
7220 dev->srCache[i].lastUse = 0;
7221 dev->srCache[i].dirty = 0;
7222 dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
7223 }
7224 if(!buf)
7225 init_failed = 1;
7226
7227 dev->srLastUse = 0;
7228 }
7229
7230 dev->cacheHits = 0;
7231
7232 if(!init_failed){
7233 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7234 if(!dev->gcCleanupList)
7235 init_failed = 1;
7236 }
7237
7238 if (dev->isYaffs2) {
7239 dev->useHeaderFileSize = 1;
7240 }
7241 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7242 init_failed = 1;
7243
7244 yaffs_InitialiseTnodes(dev);
7245 yaffs_InitialiseObjects(dev);
7246
7247 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7248 init_failed = 1;
7249
7250
7251 if(!init_failed){
7252 /* Now scan the flash. */
7253 if (dev->isYaffs2) {
7254 if(yaffs_CheckpointRestore(dev)) {
7255 T(YAFFS_TRACE_ALWAYS,
7256 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7257 } else {
7258
7259 /* Clean up the mess caused by an aborted checkpoint load
7260 * and scan backwards.
7261 */
7262 yaffs_DeinitialiseBlocks(dev);
7263 yaffs_DeinitialiseTnodes(dev);
7264 yaffs_DeinitialiseObjects(dev);
7265
7266
7267 dev->nErasedBlocks = 0;
7268 dev->nFreeChunks = 0;
7269 dev->allocationBlock = -1;
7270 dev->allocationPage = -1;
7271 dev->nDeletedFiles = 0;
7272 dev->nUnlinkedFiles = 0;
7273 dev->nBackgroundDeletions = 0;
7274 dev->oldestDirtySequence = 0;
7275
7276 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7277 init_failed = 1;
7278
7279 yaffs_InitialiseTnodes(dev);
7280 yaffs_InitialiseObjects(dev);
7281
7282 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7283 init_failed = 1;
7284
7285 if(!init_failed && !yaffs_ScanBackwards(dev))
7286 init_failed = 1;
7287 }
7288 }else
7289 if(!yaffs_Scan(dev))
7290 init_failed = 1;
7291 }
7292
7293 if(init_failed){
7294 /* Clean up the mess */
7295 T(YAFFS_TRACE_TRACING,
7296 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7297
7298 yaffs_Deinitialise(dev);
7299 return YAFFS_FAIL;
7300 }
7301
7302 /* Zero out stats */
7303 dev->nPageReads = 0;
7304 dev->nPageWrites = 0;
7305 dev->nBlockErasures = 0;
7306 dev->nGCCopies = 0;
7307 dev->nRetriedWrites = 0;
7308
7309 dev->nRetiredBlocks = 0;
7310
7311 yaffs_VerifyFreeChunks(dev);
7312 yaffs_VerifyBlocks(dev);
7313
7314
7315 T(YAFFS_TRACE_TRACING,
7316 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7317 return YAFFS_OK;
7318
7319 }
7320
7321 void yaffs_Deinitialise(yaffs_Device * dev)
7322 {
7323 if (dev->isMounted) {
7324 int i;
7325
7326 yaffs_DeinitialiseBlocks(dev);
7327 yaffs_DeinitialiseTnodes(dev);
7328 yaffs_DeinitialiseObjects(dev);
7329 if (dev->nShortOpCaches > 0 &&
7330 dev->srCache) {
7331
7332 for (i = 0; i < dev->nShortOpCaches; i++) {
7333 if(dev->srCache[i].data)
7334 YFREE(dev->srCache[i].data);
7335 dev->srCache[i].data = NULL;
7336 }
7337
7338 YFREE(dev->srCache);
7339 dev->srCache = NULL;
7340 }
7341
7342 YFREE(dev->gcCleanupList);
7343
7344 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
7345 YFREE(dev->tempBuffer[i].buffer);
7346 }
7347
7348 dev->isMounted = 0;
7349 }
7350
7351 }
7352
7353 static int yaffs_CountFreeChunks(yaffs_Device * dev)
7354 {
7355 int nFree;
7356 int b;
7357
7358 yaffs_BlockInfo *blk;
7359
7360 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7361 b++) {
7362 blk = yaffs_GetBlockInfo(dev, b);
7363
7364 switch (blk->blockState) {
7365 case YAFFS_BLOCK_STATE_EMPTY:
7366 case YAFFS_BLOCK_STATE_ALLOCATING:
7367 case YAFFS_BLOCK_STATE_COLLECTING:
7368 case YAFFS_BLOCK_STATE_FULL:
7369 nFree +=
7370 (dev->nChunksPerBlock - blk->pagesInUse +
7371 blk->softDeletions);
7372 break;
7373 default:
7374 break;
7375 }
7376
7377 }
7378
7379 return nFree;
7380 }
7381
7382 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
7383 {
7384 /* This is what we report to the outside world */
7385
7386 int nFree;
7387 int nDirtyCacheChunks;
7388 int blocksForCheckpoint;
7389
7390 #if 1
7391 nFree = dev->nFreeChunks;
7392 #else
7393 nFree = yaffs_CountFreeChunks(dev);
7394 #endif
7395
7396 nFree += dev->nDeletedFiles;
7397
7398 /* Now count the number of dirty chunks in the cache and subtract those */
7399
7400 {
7401 int i;
7402 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7403 if (dev->srCache[i].dirty)
7404 nDirtyCacheChunks++;
7405 }
7406 }
7407
7408 nFree -= nDirtyCacheChunks;
7409
7410 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7411
7412 /* Now we figure out how much to reserve for the checkpoint and report that... */
7413 blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
7414 if(blocksForCheckpoint < 0)
7415 blocksForCheckpoint = 0;
7416
7417 nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7418
7419 if (nFree < 0)
7420 nFree = 0;
7421
7422 return nFree;
7423
7424 }
7425
7426 static int yaffs_freeVerificationFailures;
7427
7428 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
7429 {
7430 int counted;
7431 int difference;
7432
7433 if(yaffs_SkipVerification(dev))
7434 return;
7435
7436 counted = yaffs_CountFreeChunks(dev);
7437
7438 difference = dev->nFreeChunks - counted;
7439
7440 if (difference) {
7441 T(YAFFS_TRACE_ALWAYS,
7442 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7443 dev->nFreeChunks, counted, difference));
7444 yaffs_freeVerificationFailures++;
7445 }
7446 }
7447
7448 /*---------------------------------------- YAFFS test code ----------------------*/
7449
7450 #define yaffs_CheckStruct(structure,syze, name) \
7451 if(sizeof(structure) != syze) \
7452 { \
7453 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
7454 name,syze,sizeof(structure))); \
7455 return YAFFS_FAIL; \
7456 }
7457
7458 static int yaffs_CheckStructures(void)
7459 {
7460 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
7461 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
7462 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
7463 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7464 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
7465 #endif
7466 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
7467
7468 return YAFFS_OK;
7469 }
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