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openrisc: Work around potential relocation issues
[people/ms/u-boot.git] / fs / yaffs2 / yaffs_guts.c
CommitLineData
0e8cc8bd
WJ		 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
90ef117b
WJ		 14/* XXX U-BOOT XXX */
15#include <common.h>
16
0e8cc8bd
WJ		 17const char *yaffs_guts_c_version =
18 "$Id: yaffs_guts.c,v 1.52 2007/10/16 00:45:05 charles Exp $";
19
20#include "yportenv.h"
90ef117b 21#include "linux/stat.h"
0e8cc8bd
WJ		 22
23#include "yaffsinterface.h"
90ef117b 24#include "yaffsfs.h"
0e8cc8bd
WJ		 25#include "yaffs_guts.h"
26#include "yaffs_tagsvalidity.h"
27
28#include "yaffs_tagscompat.h"
29#ifndef CONFIG_YAFFS_USE_OWN_SORT
30#include "yaffs_qsort.h"
31#endif
32#include "yaffs_nand.h"
33
34#include "yaffs_checkptrw.h"
35
36#include "yaffs_nand.h"
37#include "yaffs_packedtags2.h"
38
90ef117b 39#include "malloc.h"
0e8cc8bd
WJ		 40
41#ifdef CONFIG_YAFFS_WINCE
42void yfsd_LockYAFFS(BOOL fsLockOnly);
43void yfsd_UnlockYAFFS(BOOL fsLockOnly);
44#endif
45
46#define YAFFS_PASSIVE_GC_CHUNKS 2
47
48#include "yaffs_ecc.h"
49
50
51/* Robustification (if it ever comes about...) */
52static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
53static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
54static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
55 const __u8 * data,
56 const yaffs_ExtendedTags * tags);
57static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
58 const yaffs_ExtendedTags * tags);
59
60/* Other local prototypes */
61static int yaffs_UnlinkObject( yaffs_Object *obj);
62static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
63
64static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
65
66static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
67 const __u8 * buffer,
68 yaffs_ExtendedTags * tags,
69 int useReserve);
70static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
71 int chunkInNAND, int inScan);
72
73static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
74 yaffs_ObjectType type);
75static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
76 yaffs_Object * obj);
77static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
78 int force, int isShrink, int shadows);
79static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
80static int yaffs_CheckStructures(void);
0e8cc8bd
WJ		 81static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
82
83static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
84
85static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
86static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
87 int lineNo);
88
89static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
90 int chunkInNAND);
91
92static int yaffs_UnlinkWorker(yaffs_Object * obj);
93static void yaffs_DestroyObject(yaffs_Object * obj);
94
95static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
96 int chunkInObject);
97
98loff_t yaffs_GetFileSize(yaffs_Object * obj);
99
100static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
101
102static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
103
104static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
105
106#ifdef YAFFS_PARANOID
107static int yaffs_CheckFileSanity(yaffs_Object * in);
108#else
109#define yaffs_CheckFileSanity(in)
110#endif
111
112static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
113static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
114
115static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
116
117static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
118 yaffs_ExtendedTags * tags);
119
120static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
121static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
122 yaffs_FileStructure * fStruct,
123 __u32 chunkId);
124
125
126/* Function to calculate chunk and offset */
127
128static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
129{
130 if(dev->chunkShift){
131 /* Easy-peasy power of 2 case */
132 *chunk = (__u32)(addr >> dev->chunkShift);
133 *offset = (__u32)(addr & dev->chunkMask);
134 }
135 else if(dev->crumbsPerChunk)
136 {
137 /* Case where we're using "crumbs" */
138 *offset = (__u32)(addr & dev->crumbMask);
139 addr >>= dev->crumbShift;
140 *chunk = ((__u32)addr)/dev->crumbsPerChunk;
141 *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
142 }
143 else
144 YBUG();
145}
146
4b070809 147/* Function to return the number of shifts for a power of 2 greater than or equal
0e8cc8bd
WJ		 148 * to the given number
149 * Note we don't try to cater for all possible numbers and this does not have to
150 * be hellishly efficient.
151 */
4b070809 152
0e8cc8bd
WJ		 153static __u32 ShiftsGE(__u32 x)
154{
155 int extraBits;
156 int nShifts;
4b070809 157
0e8cc8bd 158 nShifts = extraBits = 0;
4b070809 159
0e8cc8bd
WJ		 160 while(x>1){
161 if(x & 1) extraBits++;
162 x>>=1;
163 nShifts++;
164 }
165
4b070809 166 if(extraBits)
0e8cc8bd 167 nShifts++;
4b070809 168
0e8cc8bd
WJ		 169 return nShifts;
170}
171
172/* Function to return the number of shifts to get a 1 in bit 0
173 */
4b070809 174
0e8cc8bd
WJ		 175static __u32 ShiftDiv(__u32 x)
176{
177 int nShifts;
4b070809 178
0e8cc8bd 179 nShifts = 0;
4b070809 180
0e8cc8bd 181 if(!x) return 0;
4b070809 182
0e8cc8bd
WJ		 183 while( !(x&1)){
184 x>>=1;
185 nShifts++;
186 }
4b070809 187
0e8cc8bd
WJ		 188 return nShifts;
189}
190
191
192
4b070809 193/*
0e8cc8bd
WJ		 194 * Temporary buffer manipulations.
195 */
196
4b070809 197static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
0e8cc8bd
WJ		 198{
199 int i;
200 __u8 *buf = (__u8 *)1;
4b070809 201
0e8cc8bd 202 memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
4b070809 203
0e8cc8bd
WJ		 204 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
205 dev->tempBuffer[i].line = 0; /* not in use */
206 dev->tempBuffer[i].buffer = buf =
207 YMALLOC_DMA(dev->nDataBytesPerChunk);
208 }
4b070809 209
0e8cc8bd 210 return buf ? YAFFS_OK : YAFFS_FAIL;
4b070809 211
0e8cc8bd
WJ		 212}
213
214static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
215{
216 int i, j;
217 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
218 if (dev->tempBuffer[i].line == 0) {
219 dev->tempBuffer[i].line = lineNo;
220 if ((i + 1) > dev->maxTemp) {
221 dev->maxTemp = i + 1;
222 for (j = 0; j <= i; j++)
223 dev->tempBuffer[j].maxLine =
224 dev->tempBuffer[j].line;
225 }
226
227 return dev->tempBuffer[i].buffer;
228 }
229 }
230
231 T(YAFFS_TRACE_BUFFERS,
232 (TSTR("Out of temp buffers at line %d, other held by lines:"),
233 lineNo));
234 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
235 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
236 }
237 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
238
239 /*
240 * If we got here then we have to allocate an unmanaged one
241 * This is not good.
242 */
243
244 dev->unmanagedTempAllocations++;
245 return YMALLOC(dev->nDataBytesPerChunk);
246
247}
248
249static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
250 int lineNo)
251{
252 int i;
253 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
254 if (dev->tempBuffer[i].buffer == buffer) {
255 dev->tempBuffer[i].line = 0;
256 return;
257 }
258 }
259
260 if (buffer) {
261 /* assume it is an unmanaged one. */
262 T(YAFFS_TRACE_BUFFERS,
263 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
264 lineNo));
265 YFREE(buffer);
266 dev->unmanagedTempDeallocations++;
267 }
268
269}
270
271/*
272 * Determine if we have a managed buffer.
273 */
274int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
275{
276 int i;
277 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
278 if (dev->tempBuffer[i].buffer == buffer)
279 return 1;
280
281 }
282
283 for (i = 0; i < dev->nShortOpCaches; i++) {
4b070809
WD		 284 if( dev->srCache[i].data == buffer )
285 return 1;
0e8cc8bd
WJ		 286
287 }
288
289 if (buffer == dev->checkpointBuffer)
290 return 1;
291
292 T(YAFFS_TRACE_ALWAYS,
293 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
294 return 0;
295}
296
297
298
299/*
300 * Chunk bitmap manipulations
301 */
302
303static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
304{
305 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
306 T(YAFFS_TRACE_ERROR,
307 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
308 blk));
309 YBUG();
310 }
311 return dev->chunkBits +
312 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
313}
314
315static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
316{
317 if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
318 chunk < 0 || chunk >= dev->nChunksPerBlock) {
319 T(YAFFS_TRACE_ERROR,
320 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
321 YBUG();
322 }
323}
324
325static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
326{
327 __u8 *blkBits = yaffs_BlockBits(dev, blk);
328
329 memset(blkBits, 0, dev->chunkBitmapStride);
330}
331
332static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
333{
334 __u8 *blkBits = yaffs_BlockBits(dev, blk);
335
336 yaffs_VerifyChunkBitId(dev,blk,chunk);
337
338 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
339}
340
341static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
342{
343 __u8 *blkBits = yaffs_BlockBits(dev, blk);
4b070809 344
0e8cc8bd
WJ		 345 yaffs_VerifyChunkBitId(dev,blk,chunk);
346
347 blkBits[chunk / 8] |= (1 << (chunk & 7));
348}
349
350static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
351{
352 __u8 *blkBits = yaffs_BlockBits(dev, blk);
353 yaffs_VerifyChunkBitId(dev,blk,chunk);
354
355 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
356}
357
358static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
359{
360 __u8 *blkBits = yaffs_BlockBits(dev, blk);
361 int i;
362 for (i = 0; i < dev->chunkBitmapStride; i++) {
363 if (*blkBits)
364 return 1;
365 blkBits++;
366 }
367 return 0;
368}
369
370static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
371{
372 __u8 *blkBits = yaffs_BlockBits(dev, blk);
373 int i;
374 int n = 0;
375 for (i = 0; i < dev->chunkBitmapStride; i++) {
376 __u8 x = *blkBits;
377 while(x){
378 if(x & 1)
379 n++;
380 x >>=1;
381 }
4b070809 382
0e8cc8bd
WJ		 383 blkBits++;
384 }
385 return n;
386}
387
4b070809 388/*
0e8cc8bd
WJ		 389 * Verification code
390 */
4b070809 391
3da04743 392static Y_INLINE int yaffs_SkipVerification(yaffs_Device *dev)
0e8cc8bd
WJ		 393{
394 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
395}
396
3da04743 397static Y_INLINE int yaffs_SkipFullVerification(yaffs_Device *dev)
0e8cc8bd
WJ		 398{
399 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
400}
401
3da04743 402static Y_INLINE int yaffs_SkipNANDVerification(yaffs_Device *dev)
0e8cc8bd
WJ		 403{
404 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
405}
406
407static const char * blockStateName[] = {
408"Unknown",
409"Needs scanning",
410"Scanning",
411"Empty",
412"Allocating",
413"Full",
414"Dirty",
415"Checkpoint",
416"Collecting",
417"Dead"
418};
419
420static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
421{
422 int actuallyUsed;
423 int inUse;
4b070809 424
0e8cc8bd
WJ		 425 if(yaffs_SkipVerification(dev))
426 return;
4b070809 427
0e8cc8bd
WJ		 428 /* Report illegal runtime states */
429 if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
430 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
4b070809 431
0e8cc8bd
WJ		 432 switch(bi->blockState){
433 case YAFFS_BLOCK_STATE_UNKNOWN:
434 case YAFFS_BLOCK_STATE_SCANNING:
435 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
436 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
437 n,blockStateName[bi->blockState]));
438 }
4b070809 439
0e8cc8bd 440 /* Check pages in use and soft deletions are legal */
4b070809 441
0e8cc8bd 442 actuallyUsed = bi->pagesInUse - bi->softDeletions;
4b070809 443
0e8cc8bd
WJ		 444 if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
445 bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
446 actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
447 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
448 n,bi->pagesInUse,bi->softDeletions));
4b070809
WD		 449
450
0e8cc8bd
WJ		 451 /* Check chunk bitmap legal */
452 inUse = yaffs_CountChunkBits(dev,n);
453 if(inUse != bi->pagesInUse)
454 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
455 n,bi->pagesInUse,inUse));
4b070809 456
0e8cc8bd 457 /* Check that the sequence number is valid.
4b070809 458 * Ten million is legal, but is very unlikely
0e8cc8bd 459 */
4b070809 460 if(dev->isYaffs2 &&
0e8cc8bd
WJ		 461 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
462 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
463 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
464 n,bi->sequenceNumber));
4b070809 465
0e8cc8bd
WJ		 466}
467
468static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
469{
470 yaffs_VerifyBlock(dev,bi,n);
4b070809 471
0e8cc8bd
WJ		 472 /* After collection the block should be in the erased state */
473 /* TODO: This will need to change if we do partial gc */
4b070809 474
0e8cc8bd
WJ		 475 if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
476 T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
477 n,bi->blockState));
478 }
479}
480
481static void yaffs_VerifyBlocks(yaffs_Device *dev)
482{
483 int i;
484 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
485 int nIllegalBlockStates = 0;
4b070809 486
0e8cc8bd
WJ		 487
488 if(yaffs_SkipVerification(dev))
489 return;
490
491 memset(nBlocksPerState,0,sizeof(nBlocksPerState));
492
4b070809 493
0e8cc8bd
WJ		 494 for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
495 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
496 yaffs_VerifyBlock(dev,bi,i);
497
498 if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
499 nBlocksPerState[bi->blockState]++;
500 else
501 nIllegalBlockStates++;
4b070809 502
0e8cc8bd 503 }
4b070809 504
0e8cc8bd
WJ		 505 T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
506 T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
4b070809 507
0e8cc8bd
WJ		 508 T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
509 if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
510 T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
511
512 for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
513 T(YAFFS_TRACE_VERIFY,
514 (TSTR("%s %d blocks"TENDSTR),
515 blockStateName[i],nBlocksPerState[i]));
4b070809 516
0e8cc8bd
WJ		 517 if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
518 T(YAFFS_TRACE_VERIFY,
519 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
520 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
4b070809 521
0e8cc8bd
WJ		 522 if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
523 T(YAFFS_TRACE_VERIFY,
524 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
525 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
4b070809 526
0e8cc8bd
WJ		 527 if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
528 T(YAFFS_TRACE_VERIFY,
529 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
530 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
531
532 T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
533
534}
535
536/*
537 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
538 * case those tests will not be performed.
539 */
540static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
541{
542 if(yaffs_SkipVerification(obj->myDev))
543 return;
4b070809 544
0e8cc8bd 545 if(!(tags && obj && oh)){
4b070809
WD		 546 T(YAFFS_TRACE_VERIFY,
547 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
548 (__u32)tags,(__u32)obj,(__u32)oh));
0e8cc8bd
WJ		 549 return;
550 }
4b070809 551
0e8cc8bd
WJ		 552 if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
553 oh->type > YAFFS_OBJECT_TYPE_MAX)
4b070809 554 T(YAFFS_TRACE_VERIFY,
0e8cc8bd
WJ		 555 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
556 tags->objectId, oh->type));
557
558 if(tags->objectId != obj->objectId)
4b070809 559 T(YAFFS_TRACE_VERIFY,
0e8cc8bd
WJ		 560 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
561 tags->objectId, obj->objectId));
562
563
564 /*
565 * Check that the object's parent ids match if parentCheck requested.
4b070809 566 *
0e8cc8bd
WJ		 567 * Tests do not apply to the root object.
568 */
4b070809 569
0e8cc8bd 570 if(parentCheck && tags->objectId > 1 && !obj->parent)
4b070809 571 T(YAFFS_TRACE_VERIFY,
0e8cc8bd 572 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
4b070809
WD		 573 tags->objectId, oh->parentObjectId));
574
575
0e8cc8bd 576 if(parentCheck && obj->parent &&
4b070809 577 oh->parentObjectId != obj->parent->objectId &&
0e8cc8bd
WJ		 578 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
579 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
4b070809 580 T(YAFFS_TRACE_VERIFY,
0e8cc8bd 581 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
4b070809
WD		 582 tags->objectId, oh->parentObjectId, obj->parent->objectId));
583
584
0e8cc8bd
WJ		 585 if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
586 T(YAFFS_TRACE_VERIFY,
587 (TSTR("Obj %d header name is NULL"TENDSTR),
588 obj->objectId));
589
590 if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
591 T(YAFFS_TRACE_VERIFY,
592 (TSTR("Obj %d header name is 0xFF"TENDSTR),
593 obj->objectId));
594}
595
0e8cc8bd
WJ		 596static void yaffs_VerifyFile(yaffs_Object *obj)
597{
598 int requiredTallness;
599 int actualTallness;
600 __u32 lastChunk;
601 __u32 x;
602 __u32 i;
0e8cc8bd
WJ		 603 yaffs_Device *dev;
604 yaffs_ExtendedTags tags;
605 yaffs_Tnode *tn;
606 __u32 objectId;
4b070809 607
0e8cc8bd
WJ		 608 if(obj && yaffs_SkipVerification(obj->myDev))
609 return;
4b070809 610
0e8cc8bd
WJ		 611 dev = obj->myDev;
612 objectId = obj->objectId;
4b070809 613
0e8cc8bd
WJ		 614 /* Check file size is consistent with tnode depth */
615 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
616 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
617 requiredTallness = 0;
618 while (x> 0) {
619 x >>= YAFFS_TNODES_INTERNAL_BITS;
620 requiredTallness++;
621 }
4b070809 622
0e8cc8bd 623 actualTallness = obj->variant.fileVariant.topLevel;
4b070809 624
0e8cc8bd
WJ		 625 if(requiredTallness > actualTallness )
626 T(YAFFS_TRACE_VERIFY,
627 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
628 obj->objectId,actualTallness, requiredTallness));
4b070809
WD		 629
630
631 /* Check that the chunks in the tnode tree are all correct.
0e8cc8bd
WJ		 632 * We do this by scanning through the tnode tree and
633 * checking the tags for every chunk match.
634 */
635
636 if(yaffs_SkipNANDVerification(dev))
637 return;
4b070809 638
0e8cc8bd
WJ		 639 for(i = 1; i <= lastChunk; i++){
640 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
641
642 if (tn) {
643 __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
644 if(theChunk > 0){
645 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
646 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
647 if(tags.objectId != objectId || tags.chunkId != i){
648 T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
649 objectId, i, theChunk,
650 tags.objectId, tags.chunkId));
651 }
652 }
653 }
654
655 }
656
657}
658
659static void yaffs_VerifyDirectory(yaffs_Object *obj)
660{
661 if(obj && yaffs_SkipVerification(obj->myDev))
662 return;
4b070809 663
0e8cc8bd
WJ		 664}
665
666static void yaffs_VerifyHardLink(yaffs_Object *obj)
667{
668 if(obj && yaffs_SkipVerification(obj->myDev))
669 return;
4b070809 670
0e8cc8bd
WJ		 671 /* Verify sane equivalent object */
672}
673
674static void yaffs_VerifySymlink(yaffs_Object *obj)
675{
676 if(obj && yaffs_SkipVerification(obj->myDev))
677 return;
4b070809 678
0e8cc8bd
WJ		 679 /* Verify symlink string */
680}
681
682static void yaffs_VerifySpecial(yaffs_Object *obj)
683{
684 if(obj && yaffs_SkipVerification(obj->myDev))
685 return;
686}
687
688static void yaffs_VerifyObject(yaffs_Object *obj)
689{
690 yaffs_Device *dev;
4b070809 691
0e8cc8bd
WJ		 692 __u32 chunkMin;
693 __u32 chunkMax;
4b070809 694
0e8cc8bd
WJ		 695 __u32 chunkIdOk;
696 __u32 chunkIsLive;
4b070809 697
0e8cc8bd
WJ		 698 if(!obj)
699 return;
4b070809 700
0e8cc8bd 701 dev = obj->myDev;
4b070809 702
0e8cc8bd
WJ		 703 if(yaffs_SkipVerification(dev))
704 return;
4b070809 705
0e8cc8bd 706 /* Check sane object header chunk */
4b070809 707
0e8cc8bd
WJ		 708 chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
709 chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
4b070809 710
0e8cc8bd 711 chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
4b070809
WD		 712 chunkIsLive = chunkIdOk &&
713 yaffs_CheckChunkBit(dev,
0e8cc8bd
WJ		 714 obj->chunkId / dev->nChunksPerBlock,
715 obj->chunkId % dev->nChunksPerBlock);
4b070809 716 if(!obj->fake &&
0e8cc8bd
WJ		 717 (!chunkIdOk || !chunkIsLive)) {
718 T(YAFFS_TRACE_VERIFY,
719 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
720 obj->objectId,obj->chunkId,
721 chunkIdOk ? "" : ",out of range",
722 chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
723 }
4b070809 724
0e8cc8bd
WJ		 725 if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
726 yaffs_ExtendedTags tags;
727 yaffs_ObjectHeader *oh;
728 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
4b070809 729
0e8cc8bd 730 oh = (yaffs_ObjectHeader *)buffer;
4b070809 731
0e8cc8bd 732 yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
4b070809 733
0e8cc8bd 734 yaffs_VerifyObjectHeader(obj,oh,&tags,1);
4b070809 735
0e8cc8bd
WJ		 736 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
737 }
4b070809 738
0e8cc8bd
WJ		 739 /* Verify it has a parent */
740 if(obj && !obj->fake &&
741 (!obj->parent || obj->parent->myDev != dev)){
742 T(YAFFS_TRACE_VERIFY,
743 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
4b070809 744 obj->objectId,obj->parent));
0e8cc8bd 745 }
4b070809 746
0e8cc8bd
WJ		 747 /* Verify parent is a directory */
748 if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
749 T(YAFFS_TRACE_VERIFY,
750 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
4b070809 751 obj->objectId,obj->parent->variantType));
0e8cc8bd 752 }
4b070809 753
0e8cc8bd
WJ		 754 switch(obj->variantType){
755 case YAFFS_OBJECT_TYPE_FILE:
756 yaffs_VerifyFile(obj);
757 break;
758 case YAFFS_OBJECT_TYPE_SYMLINK:
759 yaffs_VerifySymlink(obj);
760 break;
761 case YAFFS_OBJECT_TYPE_DIRECTORY:
762 yaffs_VerifyDirectory(obj);
763 break;
764 case YAFFS_OBJECT_TYPE_HARDLINK:
765 yaffs_VerifyHardLink(obj);
766 break;
767 case YAFFS_OBJECT_TYPE_SPECIAL:
768 yaffs_VerifySpecial(obj);
769 break;
770 case YAFFS_OBJECT_TYPE_UNKNOWN:
771 default:
772 T(YAFFS_TRACE_VERIFY,
773 (TSTR("Obj %d has illegaltype %d"TENDSTR),
4b070809 774 obj->objectId,obj->variantType));
0e8cc8bd
WJ		 775 break;
776 }
4b070809
WD		 777
778
0e8cc8bd
WJ		 779}
780
781static void yaffs_VerifyObjects(yaffs_Device *dev)
782{
783 yaffs_Object *obj;
784 int i;
785 struct list_head *lh;
786
787 if(yaffs_SkipVerification(dev))
788 return;
4b070809 789
0e8cc8bd 790 /* Iterate through the objects in each hash entry */
4b070809 791
0e8cc8bd 792 for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++){
4b070809 793 list_for_each(lh, &dev->objectBucket[i].list) {
0e8cc8bd
WJ		 794 if (lh) {
795 obj = list_entry(lh, yaffs_Object, hashLink);
796 yaffs_VerifyObject(obj);
797 }
798 }
799 }
800
801}
802
803
804/*
805 * Simple hash function. Needs to have a reasonable spread
806 */
4b070809 807
0e8cc8bd
WJ		 808static Y_INLINE int yaffs_HashFunction(int n)
809{
90ef117b
WJ		 810/* XXX U-BOOT XXX */
811 /*n = abs(n); */
812 if (n < 0)
813 n = -n;
0e8cc8bd
WJ		 814 return (n % YAFFS_NOBJECT_BUCKETS);
815}
816
817/*
818 * Access functions to useful fake objects
819 */
4b070809 820
0e8cc8bd
WJ		 821yaffs_Object *yaffs_Root(yaffs_Device * dev)
822{
823 return dev->rootDir;
824}
825
826yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
827{
828 return dev->lostNFoundDir;
829}
830
831
832/*
833 * Erased NAND checking functions
834 */
4b070809 835
0e8cc8bd
WJ		 836int yaffs_CheckFF(__u8 * buffer, int nBytes)
837{
838 /* Horrible, slow implementation */
839 while (nBytes--) {
840 if (*buffer != 0xFF)
841 return 0;
842 buffer++;
843 }
844 return 1;
845}
846
847static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
848 int chunkInNAND)
849{
850
851 int retval = YAFFS_OK;
852 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
853 yaffs_ExtendedTags tags;
0e8cc8bd 854
360ab450 855 yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
4b070809 856
0e8cc8bd
WJ		 857 if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
858 retval = YAFFS_FAIL;
4b070809 859
0e8cc8bd
WJ		 860
861 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
862 T(YAFFS_TRACE_NANDACCESS,
863 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
864 retval = YAFFS_FAIL;
865 }
866
867 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
868
869 return retval;
870
871}
872
873static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
874 const __u8 * data,
875 yaffs_ExtendedTags * tags,
876 int useReserve)
877{
878 int attempts = 0;
879 int writeOk = 0;
880 int chunk;
881
882 yaffs_InvalidateCheckpoint(dev);
883
884 do {
885 yaffs_BlockInfo *bi = 0;
886 int erasedOk = 0;
887
888 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
889 if (chunk < 0) {
890 /* no space */
891 break;
892 }
893
894 /* First check this chunk is erased, if it needs
895 * checking. The checking policy (unless forced
896 * always on) is as follows:
897 *
898 * Check the first page we try to write in a block.
899 * If the check passes then we don't need to check any
900 * more. If the check fails, we check again...
901 * If the block has been erased, we don't need to check.
902 *
903 * However, if the block has been prioritised for gc,
904 * then we think there might be something odd about
905 * this block and stop using it.
906 *
907 * Rationale: We should only ever see chunks that have
908 * not been erased if there was a partially written
909 * chunk due to power loss. This checking policy should
910 * catch that case with very few checks and thus save a
911 * lot of checks that are most likely not needed.
912 */
913 if (bi->gcPrioritise) {
914 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
915 /* try another chunk */
916 continue;
917 }
918
919 /* let's give it a try */
920 attempts++;
921
922#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
923 bi->skipErasedCheck = 0;
924#endif
925 if (!bi->skipErasedCheck) {
926 erasedOk = yaffs_CheckChunkErased(dev, chunk);
927 if (erasedOk != YAFFS_OK) {
928 T(YAFFS_TRACE_ERROR,
929 (TSTR ("**>> yaffs chunk %d was not erased"
930 TENDSTR), chunk));
931
932 /* try another chunk */
933 continue;
934 }
935 bi->skipErasedCheck = 1;
936 }
937
938 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
939 data, tags);
940 if (writeOk != YAFFS_OK) {
941 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
942 /* try another chunk */
943 continue;
944 }
945
946 /* Copy the data into the robustification buffer */
947 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
948
4b070809
WD		 949 } while (writeOk != YAFFS_OK &&
950 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
951
0e8cc8bd
WJ		 952 if(!writeOk)
953 chunk = -1;
954
955 if (attempts > 1) {
956 T(YAFFS_TRACE_ERROR,
957 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
958 attempts));
959
960 dev->nRetriedWrites += (attempts - 1);
961 }
962
963 return chunk;
964}
965
966/*
967 * Block retiring for handling a broken block.
968 */
4b070809 969
0e8cc8bd
WJ		 970static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
971{
972 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
973
974 yaffs_InvalidateCheckpoint(dev);
4b070809 975
0e8cc8bd
WJ		 976 yaffs_MarkBlockBad(dev, blockInNAND);
977
978 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
979 bi->gcPrioritise = 0;
980 bi->needsRetiring = 0;
981
982 dev->nRetiredBlocks++;
983}
984
985/*
986 * Functions for robustisizing TODO
987 *
988 */
4b070809 989
0e8cc8bd
WJ		 990static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
991 const __u8 * data,
992 const yaffs_ExtendedTags * tags)
993{
994}
995
996static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
997 const yaffs_ExtendedTags * tags)
998{
999}
1000
1001void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1002{
1003 if(!bi->gcPrioritise){
1004 bi->gcPrioritise = 1;
1005 dev->hasPendingPrioritisedGCs = 1;
1006 bi->chunkErrorStrikes ++;
4b070809 1007
0e8cc8bd
WJ		 1008 if(bi->chunkErrorStrikes > 3){
1009 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1010 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1011
1012 }
4b070809 1013
0e8cc8bd
WJ		 1014 }
1015}
1016
1017static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
1018{
1019
1020 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1021 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1022
1023 yaffs_HandleChunkError(dev,bi);
4b070809
WD		 1024
1025
0e8cc8bd
WJ		 1026 if(erasedOk ) {
1027 /* Was an actual write failure, so mark the block for retirement */
1028 bi->needsRetiring = 1;
1029 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1030 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1031
4b070809 1032
0e8cc8bd 1033 }
4b070809 1034
0e8cc8bd
WJ		 1035 /* Delete the chunk */
1036 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1037}
1038
1039
4b070809 1040/*---------------- Name handling functions ------------*/
0e8cc8bd
WJ		 1041
1042static __u16 yaffs_CalcNameSum(const YCHAR * name)
1043{
1044 __u16 sum = 0;
1045 __u16 i = 1;
1046
1047 YUCHAR *bname = (YUCHAR *) name;
1048 if (bname) {
1049 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1050
1051#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1052 sum += yaffs_toupper(*bname) * i;
1053#else
1054 sum += (*bname) * i;
1055#endif
1056 i++;
1057 bname++;
1058 }
1059 }
1060 return sum;
1061}
1062
1063static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
1064{
1065#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1066 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
1067 yaffs_strcpy(obj->shortName, name);
1068 } else {
1069 obj->shortName[0] = _Y('\0');
1070 }
1071#endif
1072 obj->sum = yaffs_CalcNameSum(name);
1073}
1074
1075/*-------------------- TNODES -------------------
1076
1077 * List of spare tnodes
1078 * The list is hooked together using the first pointer
1079 * in the tnode.
1080 */
4b070809 1081
0e8cc8bd
WJ		 1082/* yaffs_CreateTnodes creates a bunch more tnodes and
1083 * adds them to the tnode free list.
1084 * Don't use this function directly
1085 */
1086
1087static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
1088{
1089 int i;
1090 int tnodeSize;
1091 yaffs_Tnode *newTnodes;
1092 __u8 *mem;
1093 yaffs_Tnode *curr;
1094 yaffs_Tnode *next;
1095 yaffs_TnodeList *tnl;
1096
1097 if (nTnodes < 1)
1098 return YAFFS_OK;
4b070809 1099
0e8cc8bd
WJ		 1100 /* Calculate the tnode size in bytes for variable width tnode support.
1101 * Must be a multiple of 32-bits */
1102 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1103
1104 /* make these things */
1105
1106 newTnodes = YMALLOC(nTnodes * tnodeSize);
1107 mem = (__u8 *)newTnodes;
1108
1109 if (!newTnodes) {
1110 T(YAFFS_TRACE_ERROR,
1111 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1112 return YAFFS_FAIL;
1113 }
1114
1115 /* Hook them into the free list */
1116#if 0
1117 for (i = 0; i < nTnodes - 1; i++) {
1118 newTnodes[i].internal[0] = &newTnodes[i + 1];
1119#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1120 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1121#endif
1122 }
1123
1124 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1125#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1126 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1127#endif
1128 dev->freeTnodes = newTnodes;
1129#else
1130 /* New hookup for wide tnodes */
1131 for(i = 0; i < nTnodes -1; i++) {
1132 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1133 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1134 curr->internal[0] = next;
1135 }
4b070809 1136
0e8cc8bd
WJ		 1137 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1138 curr->internal[0] = dev->freeTnodes;
1139 dev->freeTnodes = (yaffs_Tnode *)mem;
1140
1141#endif
1142
1143
1144 dev->nFreeTnodes += nTnodes;
1145 dev->nTnodesCreated += nTnodes;
1146
1147 /* Now add this bunch of tnodes to a list for freeing up.
1148 * NB If we can't add this to the management list it isn't fatal
1149 * but it just means we can't free this bunch of tnodes later.
1150 */
4b070809 1151
0e8cc8bd
WJ		 1152 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1153 if (!tnl) {
1154 T(YAFFS_TRACE_ERROR,
1155 (TSTR
1156 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1157 return YAFFS_FAIL;
1158
1159 } else {
1160 tnl->tnodes = newTnodes;
1161 tnl->next = dev->allocatedTnodeList;
1162 dev->allocatedTnodeList = tnl;
1163 }
1164
1165 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1166
1167 return YAFFS_OK;
1168}
1169
1170/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1171
1172static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
1173{
1174 yaffs_Tnode *tn = NULL;
1175
1176 /* If there are none left make more */
1177 if (!dev->freeTnodes) {
1178 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1179 }
1180
1181 if (dev->freeTnodes) {
1182 tn = dev->freeTnodes;
1183#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1184 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1185 /* Hoosterman, this thing looks like it isn't in the list */
1186 T(YAFFS_TRACE_ALWAYS,
1187 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1188 }
1189#endif
1190 dev->freeTnodes = dev->freeTnodes->internal[0];
1191 dev->nFreeTnodes--;
1192 }
1193
1194 return tn;
1195}
1196
1197static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
1198{
1199 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
4b070809 1200
0e8cc8bd
WJ		 1201 if(tn)
1202 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1203
4b070809 1204 return tn;
0e8cc8bd
WJ		 1205}
1206
1207/* FreeTnode frees up a tnode and puts it back on the free list */
1208static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
1209{
1210 if (tn) {
1211#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1212 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1213 /* Hoosterman, this thing looks like it is already in the list */
1214 T(YAFFS_TRACE_ALWAYS,
1215 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1216 }
1217 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1218#endif
1219 tn->internal[0] = dev->freeTnodes;
1220 dev->freeTnodes = tn;
1221 dev->nFreeTnodes++;
1222 }
1223}
1224
1225static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
1226{
1227 /* Free the list of allocated tnodes */
1228 yaffs_TnodeList *tmp;
1229
1230 while (dev->allocatedTnodeList) {
1231 tmp = dev->allocatedTnodeList->next;
1232
1233 YFREE(dev->allocatedTnodeList->tnodes);
1234 YFREE(dev->allocatedTnodeList);
1235 dev->allocatedTnodeList = tmp;
1236
1237 }
1238
1239 dev->freeTnodes = NULL;
1240 dev->nFreeTnodes = 0;
1241}
1242
1243static void yaffs_InitialiseTnodes(yaffs_Device * dev)
1244{
1245 dev->allocatedTnodeList = NULL;
1246 dev->freeTnodes = NULL;
1247 dev->nFreeTnodes = 0;
1248 dev->nTnodesCreated = 0;
1249
1250}
1251
1252
1253void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
1254{
1255 __u32 *map = (__u32 *)tn;
1256 __u32 bitInMap;
1257 __u32 bitInWord;
1258 __u32 wordInMap;
1259 __u32 mask;
4b070809 1260
0e8cc8bd
WJ		 1261 pos &= YAFFS_TNODES_LEVEL0_MASK;
1262 val >>= dev->chunkGroupBits;
4b070809 1263
0e8cc8bd
WJ		 1264 bitInMap = pos * dev->tnodeWidth;
1265 wordInMap = bitInMap /32;
1266 bitInWord = bitInMap & (32 -1);
4b070809 1267
0e8cc8bd 1268 mask = dev->tnodeMask << bitInWord;
4b070809 1269
0e8cc8bd
WJ		 1270 map[wordInMap] &= ~mask;
1271 map[wordInMap] |= (mask & (val << bitInWord));
4b070809 1272
0e8cc8bd
WJ		 1273 if(dev->tnodeWidth > (32-bitInWord)) {
1274 bitInWord = (32 - bitInWord);
1275 wordInMap++;;
1276 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1277 map[wordInMap] &= ~mask;
1278 map[wordInMap] |= (mask & (val >> bitInWord));
1279 }
1280}
1281
1282static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
1283{
1284 __u32 *map = (__u32 *)tn;
1285 __u32 bitInMap;
1286 __u32 bitInWord;
1287 __u32 wordInMap;
1288 __u32 val;
4b070809 1289
0e8cc8bd 1290 pos &= YAFFS_TNODES_LEVEL0_MASK;
4b070809 1291
0e8cc8bd
WJ		 1292 bitInMap = pos * dev->tnodeWidth;
1293 wordInMap = bitInMap /32;
1294 bitInWord = bitInMap & (32 -1);
4b070809 1295
0e8cc8bd 1296 val = map[wordInMap] >> bitInWord;
4b070809 1297
0e8cc8bd
WJ		 1298 if(dev->tnodeWidth > (32-bitInWord)) {
1299 bitInWord = (32 - bitInWord);
1300 wordInMap++;;
1301 val |= (map[wordInMap] << bitInWord);
1302 }
4b070809 1303
0e8cc8bd
WJ		 1304 val &= dev->tnodeMask;
1305 val <<= dev->chunkGroupBits;
4b070809 1306
0e8cc8bd
WJ		 1307 return val;
1308}
1309
1310/* ------------------- End of individual tnode manipulation -----------------*/
1311
1312/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1313 * The look up tree is represented by the top tnode and the number of topLevel
1314 * in the tree. 0 means only the level 0 tnode is in the tree.
1315 */
1316
1317/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1318static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
1319 yaffs_FileStructure * fStruct,
1320 __u32 chunkId)
1321{
1322
1323 yaffs_Tnode *tn = fStruct->top;
1324 __u32 i;
1325 int requiredTallness;
1326 int level = fStruct->topLevel;
1327
1328 /* Check sane level and chunk Id */
1329 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
1330 return NULL;
1331 }
1332
1333 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1334 return NULL;
1335 }
1336
1337 /* First check we're tall enough (ie enough topLevel) */
1338
1339 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1340 requiredTallness = 0;
1341 while (i) {
1342 i >>= YAFFS_TNODES_INTERNAL_BITS;
1343 requiredTallness++;
1344 }
1345
1346 if (requiredTallness > fStruct->topLevel) {
1347 /* Not tall enough, so we can't find it, return NULL. */
1348 return NULL;
1349 }
1350
1351 /* Traverse down to level 0 */
1352 while (level > 0 && tn) {
1353 tn = tn->
1354 internal[(chunkId >>
4b070809
WD		 1355 ( YAFFS_TNODES_LEVEL0_BITS +
1356 (level - 1) *
1357 YAFFS_TNODES_INTERNAL_BITS)
0e8cc8bd
WJ		 1358 ) &
1359 YAFFS_TNODES_INTERNAL_MASK];
1360 level--;
1361
1362 }
1363
1364 return tn;
1365}
1366
1367/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1368 * This happens in two steps:
1369 * 1. If the tree isn't tall enough, then make it taller.
1370 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1371 *
1372 * Used when modifying the tree.
1373 *
1374 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1375 * be plugged into the ttree.
1376 */
4b070809 1377
0e8cc8bd
WJ		 1378static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
1379 yaffs_FileStructure * fStruct,
1380 __u32 chunkId,
1381 yaffs_Tnode *passedTn)
1382{
1383
1384 int requiredTallness;
1385 int i;
1386 int l;
1387 yaffs_Tnode *tn;
1388
1389 __u32 x;
1390
1391
1392 /* Check sane level and page Id */
1393 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
1394 return NULL;
1395 }
1396
1397 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1398 return NULL;
1399 }
1400
1401 /* First check we're tall enough (ie enough topLevel) */
1402
1403 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1404 requiredTallness = 0;
1405 while (x) {
1406 x >>= YAFFS_TNODES_INTERNAL_BITS;
1407 requiredTallness++;
1408 }
1409
1410
1411 if (requiredTallness > fStruct->topLevel) {
1412 /* Not tall enough,gotta make the tree taller */
1413 for (i = fStruct->topLevel; i < requiredTallness; i++) {
4b070809 1414
0e8cc8bd
WJ		 1415 tn = yaffs_GetTnode(dev);
1416
1417 if (tn) {
1418 tn->internal[0] = fStruct->top;
1419 fStruct->top = tn;
1420 } else {
1421 T(YAFFS_TRACE_ERROR,
1422 (TSTR("yaffs: no more tnodes" TENDSTR)));
1423 }
1424 }
1425
1426 fStruct->topLevel = requiredTallness;
1427 }
1428
1429 /* Traverse down to level 0, adding anything we need */
1430
1431 l = fStruct->topLevel;
1432 tn = fStruct->top;
4b070809 1433
0e8cc8bd
WJ		 1434 if(l > 0) {
1435 while (l > 0 && tn) {
1436 x = (chunkId >>
1437 ( YAFFS_TNODES_LEVEL0_BITS +
1438 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1439 YAFFS_TNODES_INTERNAL_MASK;
1440
1441
1442 if((l>1) && !tn->internal[x]){
1443 /* Add missing non-level-zero tnode */
1444 tn->internal[x] = yaffs_GetTnode(dev);
1445
1446 } else if(l == 1) {
1447 /* Looking from level 1 at level 0 */
4b070809 1448 if (passedTn) {
0e8cc8bd
WJ		 1449 /* If we already have one, then release it.*/
1450 if(tn->internal[x])
1451 yaffs_FreeTnode(dev,tn->internal[x]);
1452 tn->internal[x] = passedTn;
4b070809 1453
0e8cc8bd
WJ		 1454 } else if(!tn->internal[x]) {
1455 /* Don't have one, none passed in */
1456 tn->internal[x] = yaffs_GetTnode(dev);
1457 }
1458 }
4b070809 1459
0e8cc8bd
WJ		 1460 tn = tn->internal[x];
1461 l--;
1462 }
1463 } else {
1464 /* top is level 0 */
1465 if(passedTn) {
1466 memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1467 yaffs_FreeTnode(dev,passedTn);
1468 }
1469 }
1470
1471 return tn;
1472}
1473
1474static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
1475 yaffs_ExtendedTags * tags, int objectId,
1476 int chunkInInode)
1477{
1478 int j;
1479
1480 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1481 if (yaffs_CheckChunkBit
1482 (dev, theChunk / dev->nChunksPerBlock,
1483 theChunk % dev->nChunksPerBlock)) {
1484 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1485 tags);
1486 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1487 /* found it; */
1488 return theChunk;
1489
1490 }
1491 }
1492 theChunk++;
1493 }
1494 return -1;
1495}
1496
0e8cc8bd
WJ		 1497static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1498{
1499
1500 yaffs_BlockInfo *theBlock;
1501
1502 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1503
1504 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1505 if (theBlock) {
1506 theBlock->softDeletions++;
1507 dev->nFreeChunks++;
1508 }
1509}
1510
1511/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1512 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1513 * of the tnode.
1514 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1515 */
4b070809 1516
0e8cc8bd
WJ		 1517static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1518 __u32 level, int chunkOffset)
1519{
1520 int i;
1521 int theChunk;
1522 int allDone = 1;
1523 yaffs_Device *dev = in->myDev;
1524
1525 if (tn) {
1526 if (level > 0) {
1527
1528 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1529 i--) {
1530 if (tn->internal[i]) {
1531 allDone =
1532 yaffs_SoftDeleteWorker(in,
1533 tn->
1534 internal[i],
1535 level - 1,
1536 (chunkOffset
1537 <<
1538 YAFFS_TNODES_INTERNAL_BITS)
1539 + i);
1540 if (allDone) {
1541 yaffs_FreeTnode(dev,
1542 tn->
1543 internal[i]);
1544 tn->internal[i] = NULL;
1545 } else {
1546 /* Hoosterman... how could this happen? */
1547 }
1548 }
1549 }
1550 return (allDone) ? 1 : 0;
1551 } else if (level == 0) {
1552
1553 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1554 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1555 if (theChunk) {
1556 /* Note this does not find the real chunk, only the chunk group.
4b070809 1557 * We make an assumption that a chunk group is not larger than
0e8cc8bd
WJ		 1558 * a block.
1559 */
1560 yaffs_SoftDeleteChunk(dev, theChunk);
1561 yaffs_PutLevel0Tnode(dev,tn,i,0);
1562 }
1563
1564 }
1565 return 1;
1566
1567 }
1568
1569 }
1570
1571 return 1;
1572
1573}
1574
1575static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1576{
1577 if (obj->deleted &&
1578 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1579 if (obj->nDataChunks <= 0) {
1580 /* Empty file with no duplicate object headers, just delete it immediately */
1581 yaffs_FreeTnode(obj->myDev,
1582 obj->variant.fileVariant.top);
1583 obj->variant.fileVariant.top = NULL;
1584 T(YAFFS_TRACE_TRACING,
1585 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1586 obj->objectId));
1587 yaffs_DoGenericObjectDeletion(obj);
1588 } else {
1589 yaffs_SoftDeleteWorker(obj,
1590 obj->variant.fileVariant.top,
1591 obj->variant.fileVariant.
1592 topLevel, 0);
1593 obj->softDeleted = 1;
1594 }
1595 }
1596}
1597
1598/* Pruning removes any part of the file structure tree that is beyond the
1599 * bounds of the file (ie that does not point to chunks).
1600 *
1601 * A file should only get pruned when its size is reduced.
1602 *
1603 * Before pruning, the chunks must be pulled from the tree and the
1604 * level 0 tnode entries must be zeroed out.
1605 * Could also use this for file deletion, but that's probably better handled
1606 * by a special case.
1607 */
1608
1609static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1610 __u32 level, int del0)
1611{
1612 int i;
1613 int hasData;
1614
1615 if (tn) {
1616 hasData = 0;
1617
1618 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1619 if (tn->internal[i] && level > 0) {
1620 tn->internal[i] =
1621 yaffs_PruneWorker(dev, tn->internal[i],
1622 level - 1,
1623 (i == 0) ? del0 : 1);
1624 }
1625
1626 if (tn->internal[i]) {
1627 hasData++;
1628 }
1629 }
1630
1631 if (hasData == 0 && del0) {
1632 /* Free and return NULL */
1633
1634 yaffs_FreeTnode(dev, tn);
1635 tn = NULL;
1636 }
1637
1638 }
1639
1640 return tn;
1641
1642}
1643
1644static int yaffs_PruneFileStructure(yaffs_Device * dev,
1645 yaffs_FileStructure * fStruct)
1646{
1647 int i;
1648 int hasData;
1649 int done = 0;
1650 yaffs_Tnode *tn;
1651
1652 if (fStruct->topLevel > 0) {
1653 fStruct->top =
1654 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1655
1656 /* Now we have a tree with all the non-zero branches NULL but the height
1657 * is the same as it was.
1658 * Let's see if we can trim internal tnodes to shorten the tree.
4b070809 1659 * We can do this if only the 0th element in the tnode is in use
0e8cc8bd
WJ		 1660 * (ie all the non-zero are NULL)
1661 */
1662
1663 while (fStruct->topLevel && !done) {
1664 tn = fStruct->top;
1665
1666 hasData = 0;
1667 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1668 if (tn->internal[i]) {
1669 hasData++;
1670 }
1671 }
1672
1673 if (!hasData) {
1674 fStruct->top = tn->internal[0];
1675 fStruct->topLevel--;
1676 yaffs_FreeTnode(dev, tn);
1677 } else {
1678 done = 1;
1679 }
1680 }
1681 }
1682
1683 return YAFFS_OK;
1684}
1685
1686/*-------------------- End of File Structure functions.-------------------*/
1687
1688/* yaffs_CreateFreeObjects creates a bunch more objects and
1689 * adds them to the object free list.
1690 */
1691static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1692{
1693 int i;
1694 yaffs_Object *newObjects;
1695 yaffs_ObjectList *list;
1696
1697 if (nObjects < 1)
1698 return YAFFS_OK;
1699
1700 /* make these things */
1701 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1702 list = YMALLOC(sizeof(yaffs_ObjectList));
1703
1704 if (!newObjects || !list) {
1705 if(newObjects)
1706 YFREE(newObjects);
1707 if(list)
1708 YFREE(list);
1709 T(YAFFS_TRACE_ALLOCATE,
1710 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1711 return YAFFS_FAIL;
1712 }
4b070809 1713
0e8cc8bd
WJ		 1714 /* Hook them into the free list */
1715 for (i = 0; i < nObjects - 1; i++) {
1716 newObjects[i].siblings.next =
1717 (struct list_head *)(&newObjects[i + 1]);
1718 }
1719
1720 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1721 dev->freeObjects = newObjects;
1722 dev->nFreeObjects += nObjects;
1723 dev->nObjectsCreated += nObjects;
1724
1725 /* Now add this bunch of Objects to a list for freeing up. */
1726
1727 list->objects = newObjects;
1728 list->next = dev->allocatedObjectList;
1729 dev->allocatedObjectList = list;
1730
1731 return YAFFS_OK;
1732}
1733
1734
1735/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1736static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1737{
1738 yaffs_Object *tn = NULL;
1739
1740 /* If there are none left make more */
1741 if (!dev->freeObjects) {
1742 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1743 }
1744
1745 if (dev->freeObjects) {
1746 tn = dev->freeObjects;
1747 dev->freeObjects =
1748 (yaffs_Object *) (dev->freeObjects->siblings.next);
1749 dev->nFreeObjects--;
1750
1751 /* Now sweeten it up... */
1752
1753 memset(tn, 0, sizeof(yaffs_Object));
1754 tn->myDev = dev;
1755 tn->chunkId = -1;
1756 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1757 INIT_LIST_HEAD(&(tn->hardLinks));
1758 INIT_LIST_HEAD(&(tn->hashLink));
1759 INIT_LIST_HEAD(&tn->siblings);
1760
1761 /* Add it to the lost and found directory.
1762 * NB Can't put root or lostNFound in lostNFound so
1763 * check if lostNFound exists first
1764 */
1765 if (dev->lostNFoundDir) {
1766 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1767 }
1768 }
1769
1770 return tn;
1771}
1772
1773static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1774 __u32 mode)
1775{
1776
1777 yaffs_Object *obj =
1778 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1779 if (obj) {
1780 obj->fake = 1; /* it is fake so it has no NAND presence... */
1781 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1782 obj->unlinkAllowed = 0; /* ... or unlink it */
1783 obj->deleted = 0;
1784 obj->unlinked = 0;
1785 obj->yst_mode = mode;
1786 obj->myDev = dev;
1787 obj->chunkId = 0; /* Not a valid chunk. */
1788 }
1789
1790 return obj;
1791
1792}
1793
1794static void yaffs_UnhashObject(yaffs_Object * tn)
1795{
1796 int bucket;
1797 yaffs_Device *dev = tn->myDev;
1798
1799 /* If it is still linked into the bucket list, free from the list */
1800 if (!list_empty(&tn->hashLink)) {
1801 list_del_init(&tn->hashLink);
1802 bucket = yaffs_HashFunction(tn->objectId);
1803 dev->objectBucket[bucket].count--;
1804 }
1805
1806}
1807
1808/* FreeObject frees up a Object and puts it back on the free list */
1809static void yaffs_FreeObject(yaffs_Object * tn)
1810{
1811
1812 yaffs_Device *dev = tn->myDev;
1813
90ef117b
WJ		 1814/* XXX U-BOOT XXX */
1815#if 0
0e8cc8bd
WJ		 1816#ifdef __KERNEL__
1817 if (tn->myInode) {
1818 /* We're still hooked up to a cached inode.
1819 * Don't delete now, but mark for later deletion
1820 */
1821 tn->deferedFree = 1;
1822 return;
1823 }
1824#endif
90ef117b 1825#endif
0e8cc8bd
WJ		 1826 yaffs_UnhashObject(tn);
1827
1828 /* Link into the free list. */
1829 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1830 dev->freeObjects = tn;
1831 dev->nFreeObjects++;
1832}
1833
90ef117b
WJ		 1834/* XXX U-BOOT XXX */
1835#if 0
0e8cc8bd
WJ		 1836#ifdef __KERNEL__
1837
1838void yaffs_HandleDeferedFree(yaffs_Object * obj)
1839{
1840 if (obj->deferedFree) {
1841 yaffs_FreeObject(obj);
1842 }
1843}
1844
90ef117b 1845#endif
0e8cc8bd
WJ		 1846#endif
1847
1848static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1849{
1850 /* Free the list of allocated Objects */
1851
1852 yaffs_ObjectList *tmp;
1853
1854 while (dev->allocatedObjectList) {
1855 tmp = dev->allocatedObjectList->next;
1856 YFREE(dev->allocatedObjectList->objects);
1857 YFREE(dev->allocatedObjectList);
1858
1859 dev->allocatedObjectList = tmp;
1860 }
1861
1862 dev->freeObjects = NULL;
1863 dev->nFreeObjects = 0;
1864}
1865
1866static void yaffs_InitialiseObjects(yaffs_Device * dev)
1867{
1868 int i;
1869
1870 dev->allocatedObjectList = NULL;
1871 dev->freeObjects = NULL;
1872 dev->nFreeObjects = 0;
1873
1874 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1875 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1876 dev->objectBucket[i].count = 0;
1877 }
1878
1879}
1880
1881static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
1882{
1883 static int x = 0;
1884 int i;
1885 int l = 999;
1886 int lowest = 999999;
1887
1888 /* First let's see if we can find one that's empty. */
1889
1890 for (i = 0; i < 10 && lowest > 0; i++) {
1891 x++;
1892 x %= YAFFS_NOBJECT_BUCKETS;
1893 if (dev->objectBucket[x].count < lowest) {
1894 lowest = dev->objectBucket[x].count;
1895 l = x;
1896 }
1897
1898 }
1899
1900 /* If we didn't find an empty list, then try
1901 * looking a bit further for a short one
1902 */
1903
1904 for (i = 0; i < 10 && lowest > 3; i++) {
1905 x++;
1906 x %= YAFFS_NOBJECT_BUCKETS;
1907 if (dev->objectBucket[x].count < lowest) {
1908 lowest = dev->objectBucket[x].count;
1909 l = x;
1910 }
1911
1912 }
1913
1914 return l;
1915}
1916
1917static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
1918{
1919 int bucket = yaffs_FindNiceObjectBucket(dev);
1920
1921 /* Now find an object value that has not already been taken
1922 * by scanning the list.
1923 */
1924
1925 int found = 0;
1926 struct list_head *i;
1927
1928 __u32 n = (__u32) bucket;
1929
1930 /* yaffs_CheckObjectHashSanity(); */
1931
1932 while (!found) {
1933 found = 1;
1934 n += YAFFS_NOBJECT_BUCKETS;
1935 if (1 || dev->objectBucket[bucket].count > 0) {
1936 list_for_each(i, &dev->objectBucket[bucket].list) {
1937 /* If there is already one in the list */
1938 if (i
1939 && list_entry(i, yaffs_Object,
1940 hashLink)->objectId == n) {
1941 found = 0;
1942 }
1943 }
1944 }
1945 }
1946
1947
1948 return n;
1949}
1950
1951static void yaffs_HashObject(yaffs_Object * in)
1952{
1953 int bucket = yaffs_HashFunction(in->objectId);
1954 yaffs_Device *dev = in->myDev;
1955
1956 list_add(&in->hashLink, &dev->objectBucket[bucket].list);
1957 dev->objectBucket[bucket].count++;
1958
1959}
1960
1961yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
1962{
1963 int bucket = yaffs_HashFunction(number);
1964 struct list_head *i;
1965 yaffs_Object *in;
1966
1967 list_for_each(i, &dev->objectBucket[bucket].list) {
1968 /* Look if it is in the list */
1969 if (i) {
1970 in = list_entry(i, yaffs_Object, hashLink);
1971 if (in->objectId == number) {
90ef117b
WJ		 1972/* XXX U-BOOT XXX */
1973#if 0
0e8cc8bd
WJ		 1974#ifdef __KERNEL__
1975 /* Don't tell the VFS about this one if it is defered free */
1976 if (in->deferedFree)
1977 return NULL;
1978#endif
90ef117b 1979#endif
0e8cc8bd
WJ		 1980 return in;
1981 }
1982 }
1983 }
1984
1985 return NULL;
1986}
1987
1988yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
1989 yaffs_ObjectType type)
1990{
1991
1992 yaffs_Object *theObject;
068d6f9a 1993 yaffs_Tnode *tn = NULL;
0e8cc8bd
WJ		 1994
1995 if (number < 0) {
1996 number = yaffs_CreateNewObjectNumber(dev);
1997 }
1998
1999 theObject = yaffs_AllocateEmptyObject(dev);
2000 if(!theObject)
2001 return NULL;
4b070809 2002
0e8cc8bd
WJ		 2003 if(type == YAFFS_OBJECT_TYPE_FILE){
2004 tn = yaffs_GetTnode(dev);
2005 if(!tn){
2006 yaffs_FreeObject(theObject);
2007 return NULL;
2008 }
2009 }
4b070809
WD		 2010
2011
0e8cc8bd
WJ		 2012
2013 if (theObject) {
2014 theObject->fake = 0;
2015 theObject->renameAllowed = 1;
2016 theObject->unlinkAllowed = 1;
2017 theObject->objectId = number;
2018 yaffs_HashObject(theObject);
2019 theObject->variantType = type;
2020#ifdef CONFIG_YAFFS_WINCE
2021 yfsd_WinFileTimeNow(theObject->win_atime);
2022 theObject->win_ctime[0] = theObject->win_mtime[0] =
2023 theObject->win_atime[0];
2024 theObject->win_ctime[1] = theObject->win_mtime[1] =
2025 theObject->win_atime[1];
2026
2027#else
2028
2029 theObject->yst_atime = theObject->yst_mtime =
2030 theObject->yst_ctime = Y_CURRENT_TIME;
2031#endif
2032 switch (type) {
2033 case YAFFS_OBJECT_TYPE_FILE:
2034 theObject->variant.fileVariant.fileSize = 0;
2035 theObject->variant.fileVariant.scannedFileSize = 0;
2036 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2037 theObject->variant.fileVariant.topLevel = 0;
2038 theObject->variant.fileVariant.top = tn;
2039 break;
2040 case YAFFS_OBJECT_TYPE_DIRECTORY:
2041 INIT_LIST_HEAD(&theObject->variant.directoryVariant.
2042 children);
2043 break;
2044 case YAFFS_OBJECT_TYPE_SYMLINK:
2045 case YAFFS_OBJECT_TYPE_HARDLINK:
2046 case YAFFS_OBJECT_TYPE_SPECIAL:
2047 /* No action required */
2048 break;
2049 case YAFFS_OBJECT_TYPE_UNKNOWN:
2050 /* todo this should not happen */
2051 break;
2052 }
2053 }
2054
2055 return theObject;
2056}
2057
2058static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
2059 int number,
2060 yaffs_ObjectType type)
2061{
2062 yaffs_Object *theObject = NULL;
2063
2064 if (number > 0) {
2065 theObject = yaffs_FindObjectByNumber(dev, number);
2066 }
2067
2068 if (!theObject) {
2069 theObject = yaffs_CreateNewObject(dev, number, type);
2070 }
2071
2072 return theObject;
2073
2074}
4b070809 2075
0e8cc8bd
WJ		 2076
2077static YCHAR *yaffs_CloneString(const YCHAR * str)
2078{
2079 YCHAR *newStr = NULL;
2080
2081 if (str && *str) {
2082 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2083 if(newStr)
2084 yaffs_strcpy(newStr, str);
2085 }
2086
2087 return newStr;
2088
2089}
2090
2091/*
2092 * Mknod (create) a new object.
2093 * equivalentObject only has meaning for a hard link;
2094 * aliasString only has meaning for a sumlink.
2095 * rdev only has meaning for devices (a subset of special objects)
2096 */
4b070809 2097
0e8cc8bd
WJ		 2098static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2099 yaffs_Object * parent,
2100 const YCHAR * name,
2101 __u32 mode,
2102 __u32 uid,
2103 __u32 gid,
2104 yaffs_Object * equivalentObject,
2105 const YCHAR * aliasString, __u32 rdev)
2106{
2107 yaffs_Object *in;
068d6f9a 2108 YCHAR *str = NULL;
0e8cc8bd
WJ		 2109
2110 yaffs_Device *dev = parent->myDev;
2111
2112 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2113 if (yaffs_FindObjectByName(parent, name)) {
2114 return NULL;
2115 }
2116
2117 in = yaffs_CreateNewObject(dev, -1, type);
4b070809 2118
0e8cc8bd
WJ		 2119 if(type == YAFFS_OBJECT_TYPE_SYMLINK){
2120 str = yaffs_CloneString(aliasString);
2121 if(!str){
2122 yaffs_FreeObject(in);
2123 return NULL;
2124 }
2125 }
4b070809
WD		 2126
2127
0e8cc8bd
WJ		 2128
2129 if (in) {
2130 in->chunkId = -1;
2131 in->valid = 1;
2132 in->variantType = type;
2133
2134 in->yst_mode = mode;
2135
2136#ifdef CONFIG_YAFFS_WINCE
2137 yfsd_WinFileTimeNow(in->win_atime);
2138 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2139 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2140
2141#else
2142 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2143
2144 in->yst_rdev = rdev;
2145 in->yst_uid = uid;
2146 in->yst_gid = gid;
2147#endif
2148 in->nDataChunks = 0;
2149
2150 yaffs_SetObjectName(in, name);
2151 in->dirty = 1;
2152
2153 yaffs_AddObjectToDirectory(parent, in);
2154
2155 in->myDev = parent->myDev;
2156
2157 switch (type) {
2158 case YAFFS_OBJECT_TYPE_SYMLINK:
2159 in->variant.symLinkVariant.alias = str;
2160 break;
2161 case YAFFS_OBJECT_TYPE_HARDLINK:
2162 in->variant.hardLinkVariant.equivalentObject =
2163 equivalentObject;
2164 in->variant.hardLinkVariant.equivalentObjectId =
2165 equivalentObject->objectId;
2166 list_add(&in->hardLinks, &equivalentObject->hardLinks);
2167 break;
4b070809 2168 case YAFFS_OBJECT_TYPE_FILE:
0e8cc8bd
WJ		 2169 case YAFFS_OBJECT_TYPE_DIRECTORY:
2170 case YAFFS_OBJECT_TYPE_SPECIAL:
2171 case YAFFS_OBJECT_TYPE_UNKNOWN:
2172 /* do nothing */
2173 break;
2174 }
2175
2176 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2177 /* Could not create the object header, fail the creation */
2178 yaffs_DestroyObject(in);
2179 in = NULL;
2180 }
2181
2182 }
2183
2184 return in;
2185}
2186
2187yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
2188 __u32 mode, __u32 uid, __u32 gid)
2189{
2190 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2191 uid, gid, NULL, NULL, 0);
2192}
2193
2194yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
2195 __u32 mode, __u32 uid, __u32 gid)
2196{
2197 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2198 mode, uid, gid, NULL, NULL, 0);
2199}
2200
2201yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
2202 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2203{
2204 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2205 uid, gid, NULL, NULL, rdev);
2206}
2207
2208yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
2209 __u32 mode, __u32 uid, __u32 gid,
2210 const YCHAR * alias)
2211{
2212 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2213 uid, gid, NULL, alias, 0);
2214}
2215
2216/* yaffs_Link returns the object id of the equivalent object.*/
2217yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
2218 yaffs_Object * equivalentObject)
2219{
2220 /* Get the real object in case we were fed a hard link as an equivalent object */
2221 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2222
2223 if (yaffs_MknodObject
2224 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2225 equivalentObject, NULL, 0)) {
2226 return equivalentObject;
2227 } else {
2228 return NULL;
2229 }
2230
2231}
2232
2233static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
2234 const YCHAR * newName, int force, int shadows)
2235{
2236 int unlinkOp;
2237 int deleteOp;
2238
2239 yaffs_Object *existingTarget;
2240
2241 if (newDir == NULL) {
2242 newDir = obj->parent; /* use the old directory */
2243 }
2244
2245 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2246 T(YAFFS_TRACE_ALWAYS,
2247 (TSTR
2248 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
2249 TENDSTR)));
2250 YBUG();
2251 }
4b070809 2252
0e8cc8bd
WJ		 2253 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2254 if (obj->myDev->isYaffs2) {
2255 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2256 } else {
2257 unlinkOp = (newDir == obj->myDev->unlinkedDir
2258 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2259 }
2260
2261 deleteOp = (newDir == obj->myDev->deletedDir);
2262
2263 existingTarget = yaffs_FindObjectByName(newDir, newName);
2264
4b070809 2265 /* If the object is a file going into the unlinked directory,
0e8cc8bd 2266 * then it is OK to just stuff it in since duplicate names are allowed.
4b070809 2267 * else only proceed if the new name does not exist and if we're putting
0e8cc8bd
WJ		 2268 * it into a directory.
2269 */
2270 if ((unlinkOp ||
2271 deleteOp ||
2272 force ||
2273 (shadows > 0) ||
2274 !existingTarget) &&
2275 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2276 yaffs_SetObjectName(obj, newName);
2277 obj->dirty = 1;
2278
2279 yaffs_AddObjectToDirectory(newDir, obj);
2280
2281 if (unlinkOp)
2282 obj->unlinked = 1;
2283
2284 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2285 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
2286 return YAFFS_OK;
2287 }
2288
2289 return YAFFS_FAIL;
2290}
2291
2292int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
2293 yaffs_Object * newDir, const YCHAR * newName)
2294{
2295 yaffs_Object *obj;
2296 yaffs_Object *existingTarget;
2297 int force = 0;
2298
2299#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2300 /* Special case for case insemsitive systems (eg. WinCE).
2301 * While look-up is case insensitive, the name isn't.
2302 * Therefore we might want to change x.txt to X.txt
2303 */
2304 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
2305 force = 1;
2306 }
2307#endif
2308
2309 obj = yaffs_FindObjectByName(oldDir, oldName);
2310 /* Check new name to long. */
2311 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
2312 yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
2313 /* ENAMETOOLONG */
2314 return YAFFS_FAIL;
2315 else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
2316 yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2317 /* ENAMETOOLONG */
2318 return YAFFS_FAIL;
2319
2320 if (obj && obj->renameAllowed) {
2321
2322 /* Now do the handling for an existing target, if there is one */
2323
2324 existingTarget = yaffs_FindObjectByName(newDir, newName);
2325 if (existingTarget &&
2326 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2327 !list_empty(&existingTarget->variant.directoryVariant.children)) {
2328 /* There is a target that is a non-empty directory, so we fail */
2329 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2330 } else if (existingTarget && existingTarget != obj) {
4b070809 2331 /* Nuke the target first, using shadowing,
0e8cc8bd
WJ		 2332 * but only if it isn't the same object
2333 */
2334 yaffs_ChangeObjectName(obj, newDir, newName, force,
2335 existingTarget->objectId);
2336 yaffs_UnlinkObject(existingTarget);
2337 }
2338
2339 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2340 }
2341 return YAFFS_FAIL;
2342}
2343
2344/*------------------------- Block Management and Page Allocation ----------------*/
2345
2346static int yaffs_InitialiseBlocks(yaffs_Device * dev)
2347{
2348 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4b070809 2349
0e8cc8bd
WJ		 2350 dev->blockInfo = NULL;
2351 dev->chunkBits = NULL;
4b070809 2352
0e8cc8bd
WJ		 2353 dev->allocationBlock = -1; /* force it to get a new one */
2354
2355 /* If the first allocation strategy fails, thry the alternate one */
2356 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2357 if(!dev->blockInfo){
2358 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2359 dev->blockInfoAlt = 1;
2360 }
2361 else
2362 dev->blockInfoAlt = 0;
4b070809 2363
0e8cc8bd 2364 if(dev->blockInfo){
4b070809 2365
0e8cc8bd
WJ		 2366 /* Set up dynamic blockinfo stuff. */
2367 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2368 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2369 if(!dev->chunkBits){
2370 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2371 dev->chunkBitsAlt = 1;
2372 }
2373 else
2374 dev->chunkBitsAlt = 0;
2375 }
4b070809 2376
0e8cc8bd
WJ		 2377 if (dev->blockInfo && dev->chunkBits) {
2378 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2379 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2380 return YAFFS_OK;
2381 }
2382
2383 return YAFFS_FAIL;
2384
2385}
2386
2387static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
2388{
2389 if(dev->blockInfoAlt && dev->blockInfo)
2390 YFREE_ALT(dev->blockInfo);
2391 else if(dev->blockInfo)
2392 YFREE(dev->blockInfo);
2393
2394 dev->blockInfoAlt = 0;
2395
2396 dev->blockInfo = NULL;
4b070809 2397
0e8cc8bd
WJ		 2398 if(dev->chunkBitsAlt && dev->chunkBits)
2399 YFREE_ALT(dev->chunkBits);
2400 else if(dev->chunkBits)
2401 YFREE(dev->chunkBits);
2402 dev->chunkBitsAlt = 0;
2403 dev->chunkBits = NULL;
2404}
2405
2406static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
2407 yaffs_BlockInfo * bi)
2408{
2409 int i;
2410 __u32 seq;
2411 yaffs_BlockInfo *b;
2412
2413 if (!dev->isYaffs2)
2414 return 1; /* disqualification only applies to yaffs2. */
2415
2416 if (!bi->hasShrinkHeader)
2417 return 1; /* can gc */
2418
2419 /* Find the oldest dirty sequence number if we don't know it and save it
2420 * so we don't have to keep recomputing it.
2421 */
2422 if (!dev->oldestDirtySequence) {
2423 seq = dev->sequenceNumber;
2424
2425 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2426 i++) {
2427 b = yaffs_GetBlockInfo(dev, i);
2428 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2429 (b->pagesInUse - b->softDeletions) <
2430 dev->nChunksPerBlock && b->sequenceNumber < seq) {
2431 seq = b->sequenceNumber;
2432 }
2433 }
2434 dev->oldestDirtySequence = seq;
2435 }
2436
2437 /* Can't do gc of this block if there are any blocks older than this one that have
2438 * discarded pages.
2439 */
2440 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2441
2442}
2443
2444/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2445 * for garbage collection.
2446 */
2447
2448static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
2449 int aggressive)
2450{
2451
2452 int b = dev->currentDirtyChecker;
2453
2454 int i;
2455 int iterations;
2456 int dirtiest = -1;
2457 int pagesInUse = 0;
2458 int prioritised=0;
2459 yaffs_BlockInfo *bi;
2460 int pendingPrioritisedExist = 0;
4b070809 2461
0e8cc8bd
WJ		 2462 /* First let's see if we need to grab a prioritised block */
2463 if(dev->hasPendingPrioritisedGCs){
2464 for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
2465
2466 bi = yaffs_GetBlockInfo(dev, i);
2467 //yaffs_VerifyBlock(dev,bi,i);
4b070809 2468
0e8cc8bd
WJ		 2469 if(bi->gcPrioritise) {
2470 pendingPrioritisedExist = 1;
2471 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2472 yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
2473 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2474 dirtiest = i;
2475 prioritised = 1;
2476 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2477 }
2478 }
2479 }
4b070809 2480
0e8cc8bd
WJ		 2481 if(!pendingPrioritisedExist) /* None found, so we can clear this */
2482 dev->hasPendingPrioritisedGCs = 0;
2483 }
2484
2485 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2486 * search harder.
2487 * else (we're doing a leasurely gc), then we only bother to do this if the
2488 * block has only a few pages in use.
2489 */
2490
2491 dev->nonAggressiveSkip--;
2492
2493 if (!aggressive && (dev->nonAggressiveSkip > 0)) {
2494 return -1;
2495 }
2496
2497 if(!prioritised)
2498 pagesInUse =
4b070809 2499 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
0e8cc8bd
WJ		 2500
2501 if (aggressive) {
2502 iterations =
2503 dev->internalEndBlock - dev->internalStartBlock + 1;
2504 } else {
2505 iterations =
2506 dev->internalEndBlock - dev->internalStartBlock + 1;
2507 iterations = iterations / 16;
2508 if (iterations > 200) {
2509 iterations = 200;
2510 }
2511 }
2512
2513 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2514 b++;
2515 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2516 b = dev->internalStartBlock;
2517 }
2518
2519 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2520 T(YAFFS_TRACE_ERROR,
2521 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2522 YBUG();
2523 }
2524
2525 bi = yaffs_GetBlockInfo(dev, b);
2526
2527#if 0
2528 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
2529 dirtiest = b;
2530 pagesInUse = 0;
2531 }
4b070809 2532 else
0e8cc8bd
WJ		 2533#endif
2534
2535 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2536 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
4b070809 2537 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
0e8cc8bd
WJ		 2538 dirtiest = b;
2539 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2540 }
2541 }
2542
2543 dev->currentDirtyChecker = b;
2544
2545 if (dirtiest > 0) {
2546 T(YAFFS_TRACE_GC,
2547 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2548 dev->nChunksPerBlock - pagesInUse,prioritised));
2549 }
2550
2551 dev->oldestDirtySequence = 0;
2552
2553 if (dirtiest > 0) {
2554 dev->nonAggressiveSkip = 4;
2555 }
2556
2557 return dirtiest;
2558}
2559
2560static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
2561{
2562 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2563
2564 int erasedOk = 0;
2565
2566 /* If the block is still healthy erase it and mark as clean.
2567 * If the block has had a data failure, then retire it.
2568 */
4b070809 2569
0e8cc8bd
WJ		 2570 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2571 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2572 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
4b070809 2573
0e8cc8bd
WJ		 2574 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2575
2576 if (!bi->needsRetiring) {
2577 yaffs_InvalidateCheckpoint(dev);
2578 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2579 if (!erasedOk) {
2580 dev->nErasureFailures++;
2581 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2582 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2583 }
2584 }
2585
4b070809 2586 if (erasedOk &&
0e8cc8bd
WJ		 2587 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2588 int i;
2589 for (i = 0; i < dev->nChunksPerBlock; i++) {
2590 if (!yaffs_CheckChunkErased
2591 (dev, blockNo * dev->nChunksPerBlock + i)) {
2592 T(YAFFS_TRACE_ERROR,
2593 (TSTR
2594 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2595 TENDSTR), blockNo, i));
2596 }
2597 }
2598 }
2599
2600 if (erasedOk) {
2601 /* Clean it up... */
2602 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2603 dev->nErasedBlocks++;
2604 bi->pagesInUse = 0;
2605 bi->softDeletions = 0;
2606 bi->hasShrinkHeader = 0;
2607 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2608 bi->gcPrioritise = 0;
2609 yaffs_ClearChunkBits(dev, blockNo);
2610
2611 T(YAFFS_TRACE_ERASE,
2612 (TSTR("Erased block %d" TENDSTR), blockNo));
2613 } else {
2614 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
2615
2616 yaffs_RetireBlock(dev, blockNo);
2617 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2618 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2619 }
2620}
2621
2622static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2623{
2624 int i;
2625
2626 yaffs_BlockInfo *bi;
2627
2628 if (dev->nErasedBlocks < 1) {
2629 /* Hoosterman we've got a problem.
2630 * Can't get space to gc
2631 */
2632 T(YAFFS_TRACE_ERROR,
2633 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2634
2635 return -1;
2636 }
4b070809 2637
0e8cc8bd
WJ		 2638 /* Find an empty block. */
2639
2640 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2641 dev->allocationBlockFinder++;
2642 if (dev->allocationBlockFinder < dev->internalStartBlock
2643 || dev->allocationBlockFinder > dev->internalEndBlock) {
2644 dev->allocationBlockFinder = dev->internalStartBlock;
2645 }
2646
2647 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2648
2649 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2650 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2651 dev->sequenceNumber++;
2652 bi->sequenceNumber = dev->sequenceNumber;
2653 dev->nErasedBlocks--;
2654 T(YAFFS_TRACE_ALLOCATE,
2655 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2656 dev->allocationBlockFinder, dev->sequenceNumber,
2657 dev->nErasedBlocks));
2658 return dev->allocationBlockFinder;
2659 }
2660 }
2661
2662 T(YAFFS_TRACE_ALWAYS,
2663 (TSTR
2664 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2665 TENDSTR), dev->nErasedBlocks));
2666
2667 return -1;
2668}
2669
2670
2671// Check if there's space to allocate...
2672// Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2673static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2674{
2675 int reservedChunks;
2676 int reservedBlocks = dev->nReservedBlocks;
2677 int checkpointBlocks;
4b070809 2678
0e8cc8bd
WJ		 2679 checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
2680 if(checkpointBlocks < 0)
2681 checkpointBlocks = 0;
4b070809 2682
0e8cc8bd 2683 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
4b070809 2684
0e8cc8bd
WJ		 2685 return (dev->nFreeChunks > reservedChunks);
2686}
2687
2688static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
2689{
2690 int retVal;
2691 yaffs_BlockInfo *bi;
2692
2693 if (dev->allocationBlock < 0) {
2694 /* Get next block to allocate off */
2695 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2696 dev->allocationPage = 0;
2697 }
2698
2699 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2700 /* Not enough space to allocate unless we're allowed to use the reserve. */
2701 return -1;
2702 }
2703
2704 if (dev->nErasedBlocks < dev->nReservedBlocks
2705 && dev->allocationPage == 0) {
2706 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2707 }
2708
2709 /* Next page please.... */
2710 if (dev->allocationBlock >= 0) {
2711 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2712
2713 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2714 dev->allocationPage;
2715 bi->pagesInUse++;
2716 yaffs_SetChunkBit(dev, dev->allocationBlock,
2717 dev->allocationPage);
2718
2719 dev->allocationPage++;
2720
2721 dev->nFreeChunks--;
2722
2723 /* If the block is full set the state to full */
2724 if (dev->allocationPage >= dev->nChunksPerBlock) {
2725 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2726 dev->allocationBlock = -1;
2727 }
2728
2729 if(blockUsedPtr)
2730 *blockUsedPtr = bi;
4b070809 2731
0e8cc8bd
WJ		 2732 return retVal;
2733 }
4b070809 2734
0e8cc8bd
WJ		 2735 T(YAFFS_TRACE_ERROR,
2736 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2737
2738 return -1;
2739}
2740
2741static int yaffs_GetErasedChunks(yaffs_Device * dev)
2742{
2743 int n;
2744
2745 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2746
2747 if (dev->allocationBlock > 0) {
2748 n += (dev->nChunksPerBlock - dev->allocationPage);
2749 }
2750
2751 return n;
2752
2753}
2754
2755static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2756{
2757 int oldChunk;
2758 int newChunk;
2759 int chunkInBlock;
2760 int markNAND;
2761 int retVal = YAFFS_OK;
2762 int cleanups = 0;
2763 int i;
2764 int isCheckpointBlock;
2765 int matchingChunk;
2766
2767 int chunksBefore = yaffs_GetErasedChunks(dev);
2768 int chunksAfter;
2769
2770 yaffs_ExtendedTags tags;
2771
2772 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2773
2774 yaffs_Object *object;
2775
2776 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
4b070809 2777
0e8cc8bd
WJ		 2778 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2779
2780 T(YAFFS_TRACE_TRACING,
2781 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2782 bi->pagesInUse, bi->hasShrinkHeader));
2783
2784 /*yaffs_VerifyFreeChunks(dev); */
2785
2786 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2787
2788 /* Take off the number of soft deleted entries because
2789 * they're going to get really deleted during GC.
2790 */
2791 dev->nFreeChunks -= bi->softDeletions;
2792
2793 dev->isDoingGC = 1;
2794
2795 if (isCheckpointBlock ||
2796 !yaffs_StillSomeChunkBits(dev, block)) {
2797 T(YAFFS_TRACE_TRACING,
2798 (TSTR
2799 ("Collecting block %d that has no chunks in use" TENDSTR),
2800 block));
2801 yaffs_BlockBecameDirty(dev, block);
2802 } else {
2803
2804 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
4b070809 2805
0e8cc8bd
WJ		 2806 yaffs_VerifyBlock(dev,bi,block);
2807
2808 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2809 chunkInBlock < dev->nChunksPerBlock
2810 && yaffs_StillSomeChunkBits(dev, block);
2811 chunkInBlock++, oldChunk++) {
2812 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2813
2814 /* This page is in use and might need to be copied off */
2815
2816 markNAND = 1;
2817
2818 yaffs_InitialiseTags(&tags);
2819
2820 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2821 buffer, &tags);
2822
2823 object =
2824 yaffs_FindObjectByNumber(dev,
2825 tags.objectId);
2826
2827 T(YAFFS_TRACE_GC_DETAIL,
2828 (TSTR
2829 ("Collecting page %d, %d %d %d " TENDSTR),
2830 chunkInBlock, tags.objectId, tags.chunkId,
2831 tags.byteCount));
4b070809 2832
0e8cc8bd
WJ		 2833 if(object && !yaffs_SkipVerification(dev)){
2834 if(tags.chunkId == 0)
2835 matchingChunk = object->chunkId;
2836 else if(object->softDeleted)
2837 matchingChunk = oldChunk; /* Defeat the test */
2838 else
2839 matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
4b070809 2840
0e8cc8bd
WJ		 2841 if(oldChunk != matchingChunk)
2842 T(YAFFS_TRACE_ERROR,
2843 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2844 oldChunk,matchingChunk,tags.objectId, tags.chunkId));
4b070809 2845
0e8cc8bd
WJ		 2846 }
2847
2848 if (!object) {
2849 T(YAFFS_TRACE_ERROR,
2850 (TSTR
2851 ("page %d in gc has no object: %d %d %d "
2852 TENDSTR), oldChunk,
2853 tags.objectId, tags.chunkId, tags.byteCount));
2854 }
2855
2856 if (object && object->deleted
2857 && tags.chunkId != 0) {
2858 /* Data chunk in a deleted file, throw it away
2859 * It's a soft deleted data chunk,
4b070809 2860 * No need to copy this, just forget about it and
0e8cc8bd
WJ		 2861 * fix up the object.
2862 */
2863
2864 object->nDataChunks--;
2865
2866 if (object->nDataChunks <= 0) {
2867 /* remeber to clean up the object */
2868 dev->gcCleanupList[cleanups] =
2869 tags.objectId;
2870 cleanups++;
2871 }
2872 markNAND = 0;
2873 } else if (0
2874 /* Todo object && object->deleted && object->nDataChunks == 0 */
2875 ) {
2876 /* Deleted object header with no data chunks.
2877 * Can be discarded and the file deleted.
2878 */
2879 object->chunkId = 0;
2880 yaffs_FreeTnode(object->myDev,
2881 object->variant.
2882 fileVariant.top);
2883 object->variant.fileVariant.top = NULL;
2884 yaffs_DoGenericObjectDeletion(object);
2885
2886 } else if (object) {
2887 /* It's either a data chunk in a live file or
2888 * an ObjectHeader, so we're interested in it.
2889 * NB Need to keep the ObjectHeaders of deleted files
2890 * until the whole file has been deleted off
2891 */
2892 tags.serialNumber++;
2893
2894 dev->nGCCopies++;
2895
2896 if (tags.chunkId == 0) {
2897 /* It is an object Id,
2898 * We need to nuke the shrinkheader flags first
2899 * We no longer want the shrinkHeader flag since its work is done
2900 * and if it is left in place it will mess up scanning.
2901 * Also, clear out any shadowing stuff
2902 */
2903
2904 yaffs_ObjectHeader *oh;
2905 oh = (yaffs_ObjectHeader *)buffer;
2906 oh->isShrink = 0;
2907 oh->shadowsObject = -1;
2908 tags.extraShadows = 0;
2909 tags.extraIsShrinkHeader = 0;
4b070809 2910
0e8cc8bd
WJ		 2911 yaffs_VerifyObjectHeader(object,oh,&tags,1);
2912 }
2913
2914 newChunk =
2915 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2916
2917 if (newChunk < 0) {
2918 retVal = YAFFS_FAIL;
2919 } else {
2920
2921 /* Ok, now fix up the Tnodes etc. */
2922
2923 if (tags.chunkId == 0) {
2924 /* It's a header */
2925 object->chunkId = newChunk;
2926 object->serial = tags.serialNumber;
2927 } else {
2928 /* It's a data chunk */
2929 yaffs_PutChunkIntoFile
2930 (object,
2931 tags.chunkId,
2932 newChunk, 0);
2933 }
2934 }
2935 }
2936
2937 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2938
2939 }
2940 }
2941
2942 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2943
2944
2945 /* Do any required cleanups */
2946 for (i = 0; i < cleanups; i++) {
2947 /* Time to delete the file too */
2948 object =
2949 yaffs_FindObjectByNumber(dev,
2950 dev->gcCleanupList[i]);
2951 if (object) {
2952 yaffs_FreeTnode(dev,
2953 object->variant.fileVariant.
2954 top);
2955 object->variant.fileVariant.top = NULL;
2956 T(YAFFS_TRACE_GC,
2957 (TSTR
2958 ("yaffs: About to finally delete object %d"
2959 TENDSTR), object->objectId));
2960 yaffs_DoGenericObjectDeletion(object);
2961 object->myDev->nDeletedFiles--;
2962 }
2963
2964 }
2965
2966 }
2967
2968 yaffs_VerifyCollectedBlock(dev,bi,block);
4b070809 2969
0e8cc8bd
WJ		 2970 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
2971 T(YAFFS_TRACE_GC,
2972 (TSTR
2973 ("gc did not increase free chunks before %d after %d"
2974 TENDSTR), chunksBefore, chunksAfter));
2975 }
2976
2977 dev->isDoingGC = 0;
2978
5c2db13a 2979 return retVal;
0e8cc8bd
WJ		 2980}
2981
2982/* New garbage collector
2983 * If we're very low on erased blocks then we do aggressive garbage collection
2984 * otherwise we do "leasurely" garbage collection.
2985 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2986 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2987 *
2988 * The idea is to help clear out space in a more spread-out manner.
2989 * Dunno if it really does anything useful.
2990 */
2991static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
2992{
2993 int block;
2994 int aggressive;
2995 int gcOk = YAFFS_OK;
2996 int maxTries = 0;
4b070809 2997
0e8cc8bd
WJ		 2998 int checkpointBlockAdjust;
2999
3000 if (dev->isDoingGC) {
3001 /* Bail out so we don't get recursive gc */
3002 return YAFFS_OK;
3003 }
4b070809 3004
0e8cc8bd
WJ		 3005 /* This loop should pass the first time.
3006 * We'll only see looping here if the erase of the collected block fails.
3007 */
3008
3009 do {
3010 maxTries++;
4b070809 3011
0e8cc8bd
WJ		 3012 checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
3013 if(checkpointBlockAdjust < 0)
3014 checkpointBlockAdjust = 0;
3015
3016 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3017 /* We need a block soon...*/
3018 aggressive = 1;
3019 } else {
3020 /* We're in no hurry */
3021 aggressive = 0;
3022 }
3023
3024 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3025
3026 if (block > 0) {
3027 dev->garbageCollections++;
3028 if (!aggressive) {
3029 dev->passiveGarbageCollections++;
3030 }
3031
3032 T(YAFFS_TRACE_GC,
3033 (TSTR
3034 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3035 dev->nErasedBlocks, aggressive));
3036
3037 gcOk = yaffs_GarbageCollectBlock(dev, block);
3038 }
3039
3040 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3041 T(YAFFS_TRACE_GC,
3042 (TSTR
3043 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3044 TENDSTR), dev->nErasedBlocks, maxTries, block));
3045 }
3046 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
3047 && (maxTries < 2));
3048
3049 return aggressive ? gcOk : YAFFS_OK;
3050}
3051
3052/*------------------------- TAGS --------------------------------*/
3053
3054static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
3055 int chunkInObject)
3056{
3057 return (tags->chunkId == chunkInObject &&
3058 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3059
3060}
3061
3062
3063/*-------------------- Data file manipulation -----------------*/
3064
3065static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
3066 yaffs_ExtendedTags * tags)
3067{
3068 /*Get the Tnode, then get the level 0 offset chunk offset */
3069 yaffs_Tnode *tn;
3070 int theChunk = -1;
3071 yaffs_ExtendedTags localTags;
3072 int retVal = -1;
3073
3074 yaffs_Device *dev = in->myDev;
3075
3076 if (!tags) {
3077 /* Passed a NULL, so use our own tags space */
3078 tags = &localTags;
3079 }
3080
3081 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3082
3083 if (tn) {
3084 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3085
3086 retVal =
3087 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3088 chunkInInode);
3089 }
3090 return retVal;
3091}
3092
3093static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
3094 yaffs_ExtendedTags * tags)
3095{
3096 /* Get the Tnode, then get the level 0 offset chunk offset */
3097 yaffs_Tnode *tn;
3098 int theChunk = -1;
3099 yaffs_ExtendedTags localTags;
3100
3101 yaffs_Device *dev = in->myDev;
3102 int retVal = -1;
3103
3104 if (!tags) {
3105 /* Passed a NULL, so use our own tags space */
3106 tags = &localTags;
3107 }
3108
3109 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3110
3111 if (tn) {
3112
3113 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3114
3115 retVal =
3116 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3117 chunkInInode);
3118
3119 /* Delete the entry in the filestructure (if found) */
3120 if (retVal != -1) {
3121 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
3122 }
3123 } else {
3124 /*T(("No level 0 found for %d\n", chunkInInode)); */
3125 }
3126
3127 if (retVal == -1) {
3128 /* T(("Could not find %d to delete\n",chunkInInode)); */
3129 }
3130 return retVal;
3131}
3132
3133#ifdef YAFFS_PARANOID
3134
3135static int yaffs_CheckFileSanity(yaffs_Object * in)
3136{
3137 int chunk;
3138 int nChunks;
3139 int fSize;
3140 int failed = 0;
3141 int objId;
3142 yaffs_Tnode *tn;
3143 yaffs_Tags localTags;
3144 yaffs_Tags *tags = &localTags;
3145 int theChunk;
3146 int chunkDeleted;
3147
3148 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3149 /* T(("Object not a file\n")); */
3150 return YAFFS_FAIL;
3151 }
3152
3153 objId = in->objectId;
3154 fSize = in->variant.fileVariant.fileSize;
3155 nChunks =
3156 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3157
3158 for (chunk = 1; chunk <= nChunks; chunk++) {
3159 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3160 chunk);
3161
3162 if (tn) {
3163
3164 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
3165
3166 if (yaffs_CheckChunkBits
3167 (dev, theChunk / dev->nChunksPerBlock,
3168 theChunk % dev->nChunksPerBlock)) {
3169
3170 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3171 tags,
3172 &chunkDeleted);
3173 if (yaffs_TagsMatch
3174 (tags, in->objectId, chunk, chunkDeleted)) {
3175 /* found it; */
3176
3177 }
3178 } else {
3179
3180 failed = 1;
3181 }
3182
3183 } else {
3184 /* T(("No level 0 found for %d\n", chunk)); */
3185 }
3186 }
3187
3188 return failed ? YAFFS_FAIL : YAFFS_OK;
3189}
3190
3191#endif
3192
3193static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
3194 int chunkInNAND, int inScan)
3195{
4b070809
WD		 3196 /* NB inScan is zero unless scanning.
3197 * For forward scanning, inScan is > 0;
0e8cc8bd
WJ		 3198 * for backward scanning inScan is < 0
3199 */
4b070809 3200
0e8cc8bd
WJ		 3201 yaffs_Tnode *tn;
3202 yaffs_Device *dev = in->myDev;
3203 int existingChunk;
3204 yaffs_ExtendedTags existingTags;
3205 yaffs_ExtendedTags newTags;
3206 unsigned existingSerial, newSerial;
3207
3208 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3209 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3210 * If it is not during Scanning then something went wrong!
3211 */
3212 if (!inScan) {
3213 T(YAFFS_TRACE_ERROR,
3214 (TSTR
3215 ("yaffs tragedy:attempt to put data chunk into a non-file"
3216 TENDSTR)));
3217 YBUG();
3218 }
3219
3220 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3221 return YAFFS_OK;
3222 }
3223
4b070809 3224 tn = yaffs_AddOrFindLevel0Tnode(dev,
0e8cc8bd
WJ		 3225 &in->variant.fileVariant,
3226 chunkInInode,
3227 NULL);
3228 if (!tn) {
3229 return YAFFS_FAIL;
3230 }
3231
3232 existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3233
3234 if (inScan != 0) {
3235 /* If we're scanning then we need to test for duplicates
4b070809 3236 * NB This does not need to be efficient since it should only ever
0e8cc8bd
WJ		 3237 * happen when the power fails during a write, then only one
3238 * chunk should ever be affected.
3239 *
3240 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3241 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3242 */
3243
3244 if (existingChunk != 0) {
3245 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3246 * thus we have to do a FindChunkInFile to get the real chunk id.
3247 *
3248 * We have a duplicate now we need to decide which one to use:
3249 *
3250 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3251 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3252 * YAFFS1: Get both sets of tags and compare serial numbers.
3253 */
3254
3255 if (inScan > 0) {
3256 /* Only do this for forward scanning */
3257 yaffs_ReadChunkWithTagsFromNAND(dev,
3258 chunkInNAND,
3259 NULL, &newTags);
3260
3261 /* Do a proper find */
3262 existingChunk =
3263 yaffs_FindChunkInFile(in, chunkInInode,
3264 &existingTags);
3265 }
3266
3267 if (existingChunk <= 0) {
3268 /*Hoosterman - how did this happen? */
3269
3270 T(YAFFS_TRACE_ERROR,
3271 (TSTR
3272 ("yaffs tragedy: existing chunk < 0 in scan"
3273 TENDSTR)));
3274
3275 }
3276
4b070809 3277 /* NB The deleted flags should be false, otherwise the chunks will
0e8cc8bd
WJ		 3278 * not be loaded during a scan
3279 */
3280
3281 newSerial = newTags.serialNumber;
3282 existingSerial = existingTags.serialNumber;
3283
3284 if ((inScan > 0) &&
3285 (in->myDev->isYaffs2 ||
3286 existingChunk <= 0 ||
3287 ((existingSerial + 1) & 3) == newSerial)) {
4b070809 3288 /* Forward scanning.
0e8cc8bd
WJ		 3289 * Use new
3290 * Delete the old one and drop through to update the tnode
3291 */
3292 yaffs_DeleteChunk(dev, existingChunk, 1,
3293 __LINE__);
3294 } else {
3295 /* Backward scanning or we want to use the existing one
3296 * Use existing.
3297 * Delete the new one and return early so that the tnode isn't changed
3298 */
3299 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3300 __LINE__);
3301 return YAFFS_OK;
3302 }
3303 }
3304
3305 }
3306
3307 if (existingChunk == 0) {
3308 in->nDataChunks++;
3309 }
3310
3311 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
3312
3313 return YAFFS_OK;
3314}
3315
3316static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
3317 __u8 * buffer)
3318{
3319 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3320
3321 if (chunkInNAND >= 0) {
3322 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3323 buffer,NULL);
3324 } else {
3325 T(YAFFS_TRACE_NANDACCESS,
3326 (TSTR("Chunk %d not found zero instead" TENDSTR),
3327 chunkInNAND));
3328 /* get sane (zero) data if you read a hole */
4b070809 3329 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
0e8cc8bd
WJ		 3330 return 0;
3331 }
3332
3333}
3334
3335void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
3336{
3337 int block;
3338 int page;
3339 yaffs_ExtendedTags tags;
3340 yaffs_BlockInfo *bi;
3341
3342 if (chunkId <= 0)
3343 return;
4b070809 3344
0e8cc8bd
WJ		 3345
3346 dev->nDeletions++;
3347 block = chunkId / dev->nChunksPerBlock;
3348 page = chunkId % dev->nChunksPerBlock;
3349
3350
3351 if(!yaffs_CheckChunkBit(dev,block,page))
3352 T(YAFFS_TRACE_VERIFY,
4b070809
WD		 3353 (TSTR("Deleting invalid chunk %d"TENDSTR),
3354 chunkId));
0e8cc8bd
WJ		 3355
3356 bi = yaffs_GetBlockInfo(dev, block);
3357
3358 T(YAFFS_TRACE_DELETION,
3359 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3360
3361 if (markNAND &&
3362 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3363
3364 yaffs_InitialiseTags(&tags);
3365
3366 tags.chunkDeleted = 1;
3367
3368 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3369 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3370 } else {
3371 dev->nUnmarkedDeletions++;
3372 }
3373
3374 /* Pull out of the management area.
3375 * If the whole block became dirty, this will kick off an erasure.
3376 */
3377 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3378 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3379 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3380 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3381 dev->nFreeChunks++;
3382
3383 yaffs_ClearChunkBit(dev, block, page);
3384
3385 bi->pagesInUse--;
3386
3387 if (bi->pagesInUse == 0 &&
3388 !bi->hasShrinkHeader &&
3389 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3390 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3391 yaffs_BlockBecameDirty(dev, block);
3392 }
3393
3394 } else {
3395 /* T(("Bad news deleting chunk %d\n",chunkId)); */
3396 }
3397
3398}
3399
3400static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
3401 const __u8 * buffer, int nBytes,
3402 int useReserve)
3403{
3404 /* Find old chunk Need to do this to get serial number
3405 * Write new one and patch into tree.
3406 * Invalidate old tags.
3407 */
3408
3409 int prevChunkId;
3410 yaffs_ExtendedTags prevTags;
3411
3412 int newChunkId;
3413 yaffs_ExtendedTags newTags;
3414
3415 yaffs_Device *dev = in->myDev;
3416
3417 yaffs_CheckGarbageCollection(dev);
3418
3419 /* Get the previous chunk at this location in the file if it exists */
3420 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3421
3422 /* Set up new tags */
3423 yaffs_InitialiseTags(&newTags);
3424
3425 newTags.chunkId = chunkInInode;
3426 newTags.objectId = in->objectId;
3427 newTags.serialNumber =
3428 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3429 newTags.byteCount = nBytes;
3430
3431 newChunkId =
3432 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3433 useReserve);
3434
3435 if (newChunkId >= 0) {
3436 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3437
3438 if (prevChunkId >= 0) {
3439 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3440
3441 }
3442
3443 yaffs_CheckFileSanity(in);
3444 }
3445 return newChunkId;
3446
3447}
3448
3449/* UpdateObjectHeader updates the header on NAND for an object.
3450 * If name is not NULL, then that new name is used.
3451 */
3452int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
3453 int isShrink, int shadows)
3454{
3455
3456 yaffs_BlockInfo *bi;
3457
3458 yaffs_Device *dev = in->myDev;
3459
3460 int prevChunkId;
3461 int retVal = 0;
0e8cc8bd
WJ		 3462
3463 int newChunkId;
3464 yaffs_ExtendedTags newTags;
3465 yaffs_ExtendedTags oldTags;
3466
3467 __u8 *buffer = NULL;
3468 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3469
3470 yaffs_ObjectHeader *oh = NULL;
4b070809 3471
0e8cc8bd
WJ		 3472 yaffs_strcpy(oldName,"silly old name");
3473
3474 if (!in->fake || force) {
3475
3476 yaffs_CheckGarbageCollection(dev);
3477 yaffs_CheckObjectDetailsLoaded(in);
3478
3479 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3480 oh = (yaffs_ObjectHeader *) buffer;
3481
3482 prevChunkId = in->chunkId;
3483
3484 if (prevChunkId >= 0) {
360ab450 3485 yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
0e8cc8bd 3486 buffer, &oldTags);
4b070809 3487
0e8cc8bd 3488 yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
4b070809 3489
0e8cc8bd
WJ		 3490 memcpy(oldName, oh->name, sizeof(oh->name));
3491 }
3492
3493 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3494
3495 oh->type = in->variantType;
3496 oh->yst_mode = in->yst_mode;
3497 oh->shadowsObject = shadows;
3498
3499#ifdef CONFIG_YAFFS_WINCE
3500 oh->win_atime[0] = in->win_atime[0];
3501 oh->win_ctime[0] = in->win_ctime[0];
3502 oh->win_mtime[0] = in->win_mtime[0];
3503 oh->win_atime[1] = in->win_atime[1];
3504 oh->win_ctime[1] = in->win_ctime[1];
3505 oh->win_mtime[1] = in->win_mtime[1];
3506#else
3507 oh->yst_uid = in->yst_uid;
3508 oh->yst_gid = in->yst_gid;
3509 oh->yst_atime = in->yst_atime;
3510 oh->yst_mtime = in->yst_mtime;
3511 oh->yst_ctime = in->yst_ctime;
3512 oh->yst_rdev = in->yst_rdev;
3513#endif
3514 if (in->parent) {
3515 oh->parentObjectId = in->parent->objectId;
3516 } else {
3517 oh->parentObjectId = 0;
3518 }
3519
3520 if (name && *name) {
3521 memset(oh->name, 0, sizeof(oh->name));
3522 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3523 } else if (prevChunkId>=0) {
3524 memcpy(oh->name, oldName, sizeof(oh->name));
3525 } else {
3526 memset(oh->name, 0, sizeof(oh->name));
3527 }
3528
3529 oh->isShrink = isShrink;
3530
3531 switch (in->variantType) {
3532 case YAFFS_OBJECT_TYPE_UNKNOWN:
3533 /* Should not happen */
3534 break;
3535 case YAFFS_OBJECT_TYPE_FILE:
3536 oh->fileSize =
3537 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3538 || oh->parentObjectId ==
3539 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3540 fileVariant.fileSize;
3541 break;
3542 case YAFFS_OBJECT_TYPE_HARDLINK:
3543 oh->equivalentObjectId =
3544 in->variant.hardLinkVariant.equivalentObjectId;
3545 break;
3546 case YAFFS_OBJECT_TYPE_SPECIAL:
3547 /* Do nothing */
3548 break;
3549 case YAFFS_OBJECT_TYPE_DIRECTORY:
3550 /* Do nothing */
3551 break;
3552 case YAFFS_OBJECT_TYPE_SYMLINK:
3553 yaffs_strncpy(oh->alias,
3554 in->variant.symLinkVariant.alias,
3555 YAFFS_MAX_ALIAS_LENGTH);
3556 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3557 break;
3558 }
3559
3560 /* Tags */
3561 yaffs_InitialiseTags(&newTags);
3562 in->serial++;
3563 newTags.chunkId = 0;
3564 newTags.objectId = in->objectId;
3565 newTags.serialNumber = in->serial;
3566
3567 /* Add extra info for file header */
3568
3569 newTags.extraHeaderInfoAvailable = 1;
3570 newTags.extraParentObjectId = oh->parentObjectId;
3571 newTags.extraFileLength = oh->fileSize;
3572 newTags.extraIsShrinkHeader = oh->isShrink;
3573 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3574 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3575 newTags.extraObjectType = in->variantType;
3576
3577 yaffs_VerifyObjectHeader(in,oh,&newTags,1);
3578
3579 /* Create new chunk in NAND */
3580 newChunkId =
3581 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3582 (prevChunkId >= 0) ? 1 : 0);
3583
3584 if (newChunkId >= 0) {
3585
3586 in->chunkId = newChunkId;
3587
3588 if (prevChunkId >= 0) {
3589 yaffs_DeleteChunk(dev, prevChunkId, 1,
3590 __LINE__);
3591 }
3592
3593 if(!yaffs_ObjectHasCachedWriteData(in))
3594 in->dirty = 0;
3595
3596 /* If this was a shrink, then mark the block that the chunk lives on */
3597 if (isShrink) {
3598 bi = yaffs_GetBlockInfo(in->myDev,
3599 newChunkId /in->myDev-> nChunksPerBlock);
3600 bi->hasShrinkHeader = 1;
3601 }
3602
3603 }
3604
3605 retVal = newChunkId;
3606
3607 }
3608
3609 if (buffer)
3610 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3611
3612 return retVal;
3613}
3614
3615/*------------------------ Short Operations Cache ----------------------------------------
3616 * In many situations where there is no high level buffering (eg WinCE) a lot of
4b070809 3617 * reads might be short sequential reads, and a lot of writes may be short
0e8cc8bd 3618 * sequential writes. eg. scanning/writing a jpeg file.
4b070809 3619 * In these cases, a short read/write cache can provide a huge perfomance benefit
0e8cc8bd 3620 * with dumb-as-a-rock code.
4b070809 3621 * In Linux, the page cache provides read buffering aand the short op cache provides write
0e8cc8bd
WJ		 3622 * buffering.
3623 *
3624 * There are a limited number (~10) of cache chunks per device so that we don't
3625 * need a very intelligent search.
3626 */
3627
3628static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3629{
3630 yaffs_Device *dev = obj->myDev;
3631 int i;
3632 yaffs_ChunkCache *cache;
3633 int nCaches = obj->myDev->nShortOpCaches;
4b070809 3634
0e8cc8bd
WJ		 3635 for(i = 0; i < nCaches; i++){
3636 cache = &dev->srCache[i];
3637 if (cache->object == obj &&
3638 cache->dirty)
3639 return 1;
3640 }
4b070809 3641
0e8cc8bd
WJ		 3642 return 0;
3643}
3644
3645
3646static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
3647{
3648 yaffs_Device *dev = obj->myDev;
3649 int lowest = -99; /* Stop compiler whining. */
3650 int i;
3651 yaffs_ChunkCache *cache;
3652 int chunkWritten = 0;
3653 int nCaches = obj->myDev->nShortOpCaches;
3654
3655 if (nCaches > 0) {
3656 do {
3657 cache = NULL;
3658
3659 /* Find the dirty cache for this object with the lowest chunk id. */
3660 for (i = 0; i < nCaches; i++) {
3661 if (dev->srCache[i].object == obj &&
3662 dev->srCache[i].dirty) {
3663 if (!cache
3664 || dev->srCache[i].chunkId <
3665 lowest) {
3666 cache = &dev->srCache[i];
3667 lowest = cache->chunkId;
3668 }
3669 }
3670 }
3671
3672 if (cache && !cache->locked) {
3673 /* Write it out and free it up */
3674
3675 chunkWritten =
3676 yaffs_WriteChunkDataToObject(cache->object,
3677 cache->chunkId,
3678 cache->data,
3679 cache->nBytes,
3680 1);
3681 cache->dirty = 0;
3682 cache->object = NULL;
3683 }
3684
3685 } while (cache && chunkWritten > 0);
3686
3687 if (cache) {
3688 /* Hoosterman, disk full while writing cache out. */
3689 T(YAFFS_TRACE_ERROR,
3690 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3691
3692 }
3693 }
3694
3695}
3696
3697/*yaffs_FlushEntireDeviceCache(dev)
3698 *
3699 *
3700 */
3701
3702void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3703{
3704 yaffs_Object *obj;
3705 int nCaches = dev->nShortOpCaches;
3706 int i;
4b070809 3707
0e8cc8bd
WJ		 3708 /* Find a dirty object in the cache and flush it...
3709 * until there are no further dirty objects.
3710 */
3711 do {
3712 obj = NULL;
3713 for( i = 0; i < nCaches && !obj; i++) {
3714 if (dev->srCache[i].object &&
3715 dev->srCache[i].dirty)
3716 obj = dev->srCache[i].object;
4b070809 3717
0e8cc8bd
WJ		 3718 }
3719 if(obj)
3720 yaffs_FlushFilesChunkCache(obj);
4b070809 3721
0e8cc8bd 3722 } while(obj);
4b070809 3723
0e8cc8bd
WJ		 3724}
3725
3726
3727/* Grab us a cache chunk for use.
4b070809 3728 * First look for an empty one.
0e8cc8bd
WJ		 3729 * Then look for the least recently used non-dirty one.
3730 * Then look for the least recently used dirty one...., flush and look again.
3731 */
3732static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3733{
3734 int i;
3735 int usage;
3736 int theOne;
3737
3738 if (dev->nShortOpCaches > 0) {
3739 for (i = 0; i < dev->nShortOpCaches; i++) {
4b070809 3740 if (!dev->srCache[i].object)
0e8cc8bd
WJ		 3741 return &dev->srCache[i];
3742 }
3743
3744 return NULL;
3745
3746 theOne = -1;
3747 usage = 0; /* just to stop the compiler grizzling */
3748
3749 for (i = 0; i < dev->nShortOpCaches; i++) {
3750 if (!dev->srCache[i].dirty &&
3751 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3752 theOne < 0)) {
3753 usage = dev->srCache[i].lastUse;
3754 theOne = i;
3755 }
3756 }
3757
3758
3759 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3760 } else {
3761 return NULL;
3762 }
3763
3764}
3765
3766static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3767{
3768 yaffs_ChunkCache *cache;
3769 yaffs_Object *theObj;
3770 int usage;
3771 int i;
0e8cc8bd
WJ		 3772
3773 if (dev->nShortOpCaches > 0) {
3774 /* Try find a non-dirty one... */
3775
3776 cache = yaffs_GrabChunkCacheWorker(dev);
3777
3778 if (!cache) {
3779 /* They were all dirty, find the last recently used object and flush
3780 * its cache, then find again.
3781 * NB what's here is not very accurate, we actually flush the object
3782 * the last recently used page.
3783 */
3784
3785 /* With locking we can't assume we can use entry zero */
3786
3787 theObj = NULL;
3788 usage = -1;
3789 cache = NULL;
0e8cc8bd
WJ		 3790
3791 for (i = 0; i < dev->nShortOpCaches; i++) {
3792 if (dev->srCache[i].object &&
3793 !dev->srCache[i].locked &&
3794 (dev->srCache[i].lastUse < usage || !cache))
3795 {
3796 usage = dev->srCache[i].lastUse;
3797 theObj = dev->srCache[i].object;
3798 cache = &dev->srCache[i];
0e8cc8bd
WJ		 3799 }
3800 }
3801
3802 if (!cache || cache->dirty) {
3803 /* Flush and try again */
3804 yaffs_FlushFilesChunkCache(theObj);
3805 cache = yaffs_GrabChunkCacheWorker(dev);
3806 }
3807
3808 }
3809 return cache;
3810 } else
3811 return NULL;
3812
3813}
3814
3815/* Find a cached chunk */
3816static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3817 int chunkId)
3818{
3819 yaffs_Device *dev = obj->myDev;
3820 int i;
3821 if (dev->nShortOpCaches > 0) {
3822 for (i = 0; i < dev->nShortOpCaches; i++) {
3823 if (dev->srCache[i].object == obj &&
3824 dev->srCache[i].chunkId == chunkId) {
3825 dev->cacheHits++;
3826
3827 return &dev->srCache[i];
3828 }
3829 }
3830 }
3831 return NULL;
3832}
3833
3834/* Mark the chunk for the least recently used algorithym */
3835static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3836 int isAWrite)
3837{
3838
3839 if (dev->nShortOpCaches > 0) {
3840 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3841 /* Reset the cache usages */
3842 int i;
3843 for (i = 1; i < dev->nShortOpCaches; i++) {
3844 dev->srCache[i].lastUse = 0;
3845 }
3846 dev->srLastUse = 0;
3847 }
3848
3849 dev->srLastUse++;
3850
3851 cache->lastUse = dev->srLastUse;
3852
3853 if (isAWrite) {
3854 cache->dirty = 1;
3855 }
3856 }
3857}
3858
3859/* Invalidate a single cache page.
3860 * Do this when a whole page gets written,
3861 * ie the short cache for this page is no longer valid.
3862 */
3863static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
3864{
3865 if (object->myDev->nShortOpCaches > 0) {
3866 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3867
3868 if (cache) {
3869 cache->object = NULL;
3870 }
3871 }
3872}
3873
3874/* Invalidate all the cache pages associated with this object
3875 * Do this whenever ther file is deleted or resized.
3876 */
3877static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
3878{
3879 int i;
3880 yaffs_Device *dev = in->myDev;
3881
3882 if (dev->nShortOpCaches > 0) {
3883 /* Invalidate it. */
3884 for (i = 0; i < dev->nShortOpCaches; i++) {
3885 if (dev->srCache[i].object == in) {
3886 dev->srCache[i].object = NULL;
3887 }
3888 }
3889 }
3890}
3891
3892/*--------------------- Checkpointing --------------------*/
3893
3894
3895static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
3896{
3897 yaffs_CheckpointValidity cp;
4b070809 3898
0e8cc8bd 3899 memset(&cp,0,sizeof(cp));
4b070809 3900
0e8cc8bd
WJ		 3901 cp.structType = sizeof(cp);
3902 cp.magic = YAFFS_MAGIC;
3903 cp.version = YAFFS_CHECKPOINT_VERSION;
3904 cp.head = (head) ? 1 : 0;
4b070809 3905
0e8cc8bd
WJ		 3906 return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
3907 1 : 0;
3908}
3909
3910static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
3911{
3912 yaffs_CheckpointValidity cp;
3913 int ok;
4b070809 3914
0e8cc8bd 3915 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4b070809 3916
0e8cc8bd
WJ		 3917 if(ok)
3918 ok = (cp.structType == sizeof(cp)) &&
3919 (cp.magic == YAFFS_MAGIC) &&
3920 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
3921 (cp.head == ((head) ? 1 : 0));
3922 return ok ? 1 : 0;
3923}
3924
4b070809 3925static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
0e8cc8bd
WJ		 3926 yaffs_Device *dev)
3927{
3928 cp->nErasedBlocks = dev->nErasedBlocks;
3929 cp->allocationBlock = dev->allocationBlock;
3930 cp->allocationPage = dev->allocationPage;
3931 cp->nFreeChunks = dev->nFreeChunks;
4b070809 3932
0e8cc8bd
WJ		 3933 cp->nDeletedFiles = dev->nDeletedFiles;
3934 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
3935 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
3936 cp->sequenceNumber = dev->sequenceNumber;
3937 cp->oldestDirtySequence = dev->oldestDirtySequence;
4b070809 3938
0e8cc8bd
WJ		 3939}
3940
3941static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
3942 yaffs_CheckpointDevice *cp)
3943{
3944 dev->nErasedBlocks = cp->nErasedBlocks;
3945 dev->allocationBlock = cp->allocationBlock;
3946 dev->allocationPage = cp->allocationPage;
3947 dev->nFreeChunks = cp->nFreeChunks;
4b070809 3948
0e8cc8bd
WJ		 3949 dev->nDeletedFiles = cp->nDeletedFiles;
3950 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
3951 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
3952 dev->sequenceNumber = cp->sequenceNumber;
3953 dev->oldestDirtySequence = cp->oldestDirtySequence;
3954}
3955
3956
3957static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
3958{
3959 yaffs_CheckpointDevice cp;
3960 __u32 nBytes;
3961 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3962
3963 int ok;
4b070809 3964
0e8cc8bd
WJ		 3965 /* Write device runtime values*/
3966 yaffs_DeviceToCheckpointDevice(&cp,dev);
3967 cp.structType = sizeof(cp);
4b070809 3968
0e8cc8bd 3969 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4b070809 3970
0e8cc8bd
WJ		 3971 /* Write block info */
3972 if(ok) {
3973 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3974 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
3975 }
4b070809
WD		 3976
3977 /* Write chunk bits */
0e8cc8bd
WJ		 3978 if(ok) {
3979 nBytes = nBlocks * dev->chunkBitmapStride;
3980 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
3981 }
3982 return ok ? 1 : 0;
3983
3984}
3985
3986static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
3987{
3988 yaffs_CheckpointDevice cp;
3989 __u32 nBytes;
3990 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3991
4b070809
WD		 3992 int ok;
3993
0e8cc8bd
WJ		 3994 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3995 if(!ok)
3996 return 0;
4b070809 3997
0e8cc8bd
WJ		 3998 if(cp.structType != sizeof(cp))
3999 return 0;
4b070809
WD		 4000
4001
0e8cc8bd 4002 yaffs_CheckpointDeviceToDevice(dev,&cp);
4b070809 4003
0e8cc8bd 4004 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4b070809 4005
0e8cc8bd 4006 ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
4b070809 4007
0e8cc8bd
WJ		 4008 if(!ok)
4009 return 0;
4010 nBytes = nBlocks * dev->chunkBitmapStride;
4b070809 4011
0e8cc8bd 4012 ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
4b070809 4013
0e8cc8bd
WJ		 4014 return ok ? 1 : 0;
4015}
4016
4017static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4018 yaffs_Object *obj)
4019{
4020
4021 cp->objectId = obj->objectId;
4022 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4023 cp->chunkId = obj->chunkId;
4b070809 4024 cp->variantType = obj->variantType;
0e8cc8bd
WJ		 4025 cp->deleted = obj->deleted;
4026 cp->softDeleted = obj->softDeleted;
4027 cp->unlinked = obj->unlinked;
4028 cp->fake = obj->fake;
4029 cp->renameAllowed = obj->renameAllowed;
4030 cp->unlinkAllowed = obj->unlinkAllowed;
4031 cp->serial = obj->serial;
4032 cp->nDataChunks = obj->nDataChunks;
4b070809 4033
0e8cc8bd
WJ		 4034 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4035 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4036 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4037 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4038}
4039
4040static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
4041{
4042
4043 yaffs_Object *parent;
4b070809 4044
0e8cc8bd 4045 obj->objectId = cp->objectId;
4b070809 4046
0e8cc8bd
WJ		 4047 if(cp->parentId)
4048 parent = yaffs_FindOrCreateObjectByNumber(
4049 obj->myDev,
4050 cp->parentId,
4051 YAFFS_OBJECT_TYPE_DIRECTORY);
4052 else
4053 parent = NULL;
4b070809 4054
0e8cc8bd
WJ		 4055 if(parent)
4056 yaffs_AddObjectToDirectory(parent, obj);
4b070809 4057
0e8cc8bd 4058 obj->chunkId = cp->chunkId;
4b070809 4059 obj->variantType = cp->variantType;
0e8cc8bd
WJ		 4060 obj->deleted = cp->deleted;
4061 obj->softDeleted = cp->softDeleted;
4062 obj->unlinked = cp->unlinked;
4063 obj->fake = cp->fake;
4064 obj->renameAllowed = cp->renameAllowed;
4065 obj->unlinkAllowed = cp->unlinkAllowed;
4066 obj->serial = cp->serial;
4067 obj->nDataChunks = cp->nDataChunks;
4b070809 4068
0e8cc8bd
WJ		 4069 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4070 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4071 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4072 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4b070809 4073
0e8cc8bd
WJ		 4074 if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
4075 obj->lazyLoaded = 1;
4076}
4077
4078
4079
4080static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
4b070809 4081 __u32 level, int chunkOffset)
0e8cc8bd
WJ		 4082{
4083 int i;
4084 yaffs_Device *dev = in->myDev;
4085 int ok = 1;
4086 int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4087
4088 if (tn) {
4089 if (level > 0) {
4090
4091 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
4092 if (tn->internal[i]) {
4093 ok = yaffs_CheckpointTnodeWorker(in,
4094 tn->internal[i],
4095 level - 1,
4096 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4097 }
4098 }
4099 } else if (level == 0) {
4100 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4101 /* printf("write tnode at %d\n",baseOffset); */
4102 ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
4103 if(ok)
4104 ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
4105 }
4106 }
4107
4108 return ok;
4109
4110}
4111
4112static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4113{
4114 __u32 endMarker = ~0;
4115 int ok = 1;
4b070809 4116
0e8cc8bd
WJ		 4117 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4118 ok = yaffs_CheckpointTnodeWorker(obj,
4119 obj->variant.fileVariant.top,
4120 obj->variant.fileVariant.topLevel,
4121 0);
4122 if(ok)
4b070809 4123 ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
0e8cc8bd
WJ		 4124 sizeof(endMarker));
4125 }
4b070809 4126
0e8cc8bd
WJ		 4127 return ok ? 1 : 0;
4128}
4129
4130static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4131{
4132 __u32 baseChunk;
4133 int ok = 1;
4134 yaffs_Device *dev = obj->myDev;
4135 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4136 yaffs_Tnode *tn;
4137 int nread = 0;
4b070809 4138
0e8cc8bd 4139 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4b070809 4140
0e8cc8bd
WJ		 4141 while(ok && (~baseChunk)){
4142 nread++;
4143 /* Read level 0 tnode */
4b070809
WD		 4144
4145
0e8cc8bd
WJ		 4146 /* printf("read tnode at %d\n",baseChunk); */
4147 tn = yaffs_GetTnodeRaw(dev);
4148 if(tn)
4149 ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
4150 (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
4151 else
4152 ok = 0;
4b070809 4153
0e8cc8bd
WJ		 4154 if(tn && ok){
4155 ok = yaffs_AddOrFindLevel0Tnode(dev,
4b070809
WD		 4156 fileStructPtr,
4157 baseChunk,
4158 tn) ? 1 : 0;
4159
0e8cc8bd 4160 }
4b070809 4161
0e8cc8bd
WJ		 4162 if(ok)
4163 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4b070809 4164
0e8cc8bd
WJ		 4165 }
4166
4167 T(YAFFS_TRACE_CHECKPOINT,(
4168 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4169 nread,baseChunk,ok));
4170
4b070809 4171 return ok ? 1 : 0;
0e8cc8bd 4172}
4b070809 4173
0e8cc8bd
WJ		 4174
4175static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4176{
4177 yaffs_Object *obj;
4178 yaffs_CheckpointObject cp;
4179 int i;
4180 int ok = 1;
4181 struct list_head *lh;
4182
4b070809 4183
0e8cc8bd
WJ		 4184 /* Iterate through the objects in each hash entry,
4185 * dumping them to the checkpointing stream.
4186 */
4b070809 4187
0e8cc8bd 4188 for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
4b070809 4189 list_for_each(lh, &dev->objectBucket[i].list) {
0e8cc8bd
WJ		 4190 if (lh) {
4191 obj = list_entry(lh, yaffs_Object, hashLink);
4192 if (!obj->deferedFree) {
4193 yaffs_ObjectToCheckpointObject(&cp,obj);
4194 cp.structType = sizeof(cp);
4195
4196 T(YAFFS_TRACE_CHECKPOINT,(
4197 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4198 cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
4b070809 4199
0e8cc8bd 4200 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4b070809 4201
0e8cc8bd
WJ		 4202 if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4203 ok = yaffs_WriteCheckpointTnodes(obj);
4204 }
4205 }
4206 }
4207 }
4208 }
4b070809 4209
0e8cc8bd
WJ		 4210 /* Dump end of list */
4211 memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
4212 cp.structType = sizeof(cp);
4b070809 4213
0e8cc8bd
WJ		 4214 if(ok)
4215 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4b070809 4216
0e8cc8bd
WJ		 4217 return ok ? 1 : 0;
4218}
4219
4220static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4221{
4222 yaffs_Object *obj;
4223 yaffs_CheckpointObject cp;
4224 int ok = 1;
4225 int done = 0;
4226 yaffs_Object *hardList = NULL;
4b070809 4227
0e8cc8bd
WJ		 4228 while(ok && !done) {
4229 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4230 if(cp.structType != sizeof(cp)) {
4231 T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
4232 cp.structType,sizeof(cp),ok));
4233 ok = 0;
4234 }
4b070809 4235
0e8cc8bd
WJ		 4236 T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4237 cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
4b070809 4238
0e8cc8bd
WJ		 4239 if(ok && cp.objectId == ~0)
4240 done = 1;
4241 else if(ok){
4242 obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
4243 if(obj) {
4244 yaffs_CheckpointObjectToObject(obj,&cp);
4245 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4246 ok = yaffs_ReadCheckpointTnodes(obj);
4247 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4248 obj->hardLinks.next =
4249 (struct list_head *)
4250 hardList;
4251 hardList = obj;
4252 }
4b070809 4253
0e8cc8bd
WJ		 4254 }
4255 }
4256 }
4b070809 4257
0e8cc8bd
WJ		 4258 if(ok)
4259 yaffs_HardlinkFixup(dev,hardList);
4b070809 4260
0e8cc8bd
WJ		 4261 return ok ? 1 : 0;
4262}
4263
4264static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4265{
4266 __u32 checkpointSum;
4267 int ok;
4b070809 4268
0e8cc8bd 4269 yaffs_GetCheckpointSum(dev,&checkpointSum);
4b070809 4270
0e8cc8bd 4271 ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
4b070809 4272
0e8cc8bd
WJ		 4273 if(!ok)
4274 return 0;
4b070809 4275
0e8cc8bd
WJ		 4276 return 1;
4277}
4278
4279static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4280{
4281 __u32 checkpointSum0;
4282 __u32 checkpointSum1;
4283 int ok;
4b070809 4284
0e8cc8bd 4285 yaffs_GetCheckpointSum(dev,&checkpointSum0);
4b070809 4286
0e8cc8bd 4287 ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4b070809 4288
0e8cc8bd
WJ		 4289 if(!ok)
4290 return 0;
4b070809 4291
0e8cc8bd
WJ		 4292 if(checkpointSum0 != checkpointSum1)
4293 return 0;
4b070809 4294
0e8cc8bd
WJ		 4295 return 1;
4296}
4297
4298
4299static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4300{
4301
4302 int ok = 1;
4b070809 4303
0e8cc8bd
WJ		 4304 if(dev->skipCheckpointWrite || !dev->isYaffs2){
4305 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
4306 ok = 0;
4307 }
4b070809 4308
0e8cc8bd
WJ		 4309 if(ok)
4310 ok = yaffs_CheckpointOpen(dev,1);
4b070809 4311
0e8cc8bd
WJ		 4312 if(ok){
4313 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4314 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
4315 }
4316 if(ok){
4317 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
4318 ok = yaffs_WriteCheckpointDevice(dev);
4319 }
4320 if(ok){
4321 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
4322 ok = yaffs_WriteCheckpointObjects(dev);
4323 }
4324 if(ok){
4325 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4326 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
4327 }
4b070809 4328
0e8cc8bd
WJ		 4329 if(ok){
4330 ok = yaffs_WriteCheckpointSum(dev);
4331 }
4b070809
WD		 4332
4333
0e8cc8bd
WJ		 4334 if(!yaffs_CheckpointClose(dev))
4335 ok = 0;
4b070809 4336
0e8cc8bd 4337 if(ok)
4b070809
WD		 4338 dev->isCheckpointed = 1;
4339 else
4340 dev->isCheckpointed = 0;
0e8cc8bd
WJ		 4341
4342 return dev->isCheckpointed;
4343}
4344
4345static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4346{
4347 int ok = 1;
4b070809 4348
0e8cc8bd
WJ		 4349 if(dev->skipCheckpointRead || !dev->isYaffs2){
4350 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
4351 ok = 0;
4352 }
4b070809 4353
0e8cc8bd
WJ		 4354 if(ok)
4355 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
4b070809 4356
0e8cc8bd 4357 if(ok){
4b070809 4358 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
0e8cc8bd
WJ		 4359 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
4360 }
4361 if(ok){
4362 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
4363 ok = yaffs_ReadCheckpointDevice(dev);
4364 }
4365 if(ok){
4b070809 4366 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
0e8cc8bd
WJ		 4367 ok = yaffs_ReadCheckpointObjects(dev);
4368 }
4369 if(ok){
4370 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4371 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
4372 }
4b070809 4373
0e8cc8bd
WJ		 4374 if(ok){
4375 ok = yaffs_ReadCheckpointSum(dev);
4376 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
4377 }
4378
4379 if(!yaffs_CheckpointClose(dev))
4380 ok = 0;
4381
4382 if(ok)
4b070809
WD		 4383 dev->isCheckpointed = 1;
4384 else
4385 dev->isCheckpointed = 0;
0e8cc8bd
WJ		 4386
4387 return ok ? 1 : 0;
4388
4389}
4390
4391static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4392{
4b070809 4393 if(dev->isCheckpointed ||
0e8cc8bd
WJ		 4394 dev->blocksInCheckpoint > 0){
4395 dev->isCheckpointed = 0;
4396 yaffs_CheckpointInvalidateStream(dev);
4397 if(dev->superBlock && dev->markSuperBlockDirty)
4398 dev->markSuperBlockDirty(dev->superBlock);
4399 }
4400}
4401
4402
4403int yaffs_CheckpointSave(yaffs_Device *dev)
4404{
4405
4406 T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4407
4408 yaffs_VerifyObjects(dev);
4409 yaffs_VerifyBlocks(dev);
4410 yaffs_VerifyFreeChunks(dev);
4411
4412 if(!dev->isCheckpointed) {
4413 yaffs_InvalidateCheckpoint(dev);
4414 yaffs_WriteCheckpointData(dev);
4415 }
4b070809 4416
0e8cc8bd
WJ		 4417 T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4418
4419 return dev->isCheckpointed;
4420}
4421
4422int yaffs_CheckpointRestore(yaffs_Device *dev)
4423{
4424 int retval;
4425 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4b070809 4426
0e8cc8bd
WJ		 4427 retval = yaffs_ReadCheckpointData(dev);
4428
4429 if(dev->isCheckpointed){
4430 yaffs_VerifyObjects(dev);
4431 yaffs_VerifyBlocks(dev);
4432 yaffs_VerifyFreeChunks(dev);
4433 }
4434
4435 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4b070809 4436
0e8cc8bd
WJ		 4437 return retval;
4438}
4439
4440/*--------------------- File read/write ------------------------
4441 * Read and write have very similar structures.
4442 * In general the read/write has three parts to it
4443 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4444 * Some complete chunks
4445 * An incomplete chunk to end off with
4446 *
4447 * Curve-balls: the first chunk might also be the last chunk.
4448 */
4449
4450int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
4451 int nBytes)
4452{
4453
4754c823
MV		 4454 __u32 chunk = 0;
4455 __u32 start = 0;
0e8cc8bd
WJ		 4456 int nToCopy;
4457 int n = nBytes;
4458 int nDone = 0;
4459 yaffs_ChunkCache *cache;
4460
4461 yaffs_Device *dev;
4462
4463 dev = in->myDev;
4464
4465 while (n > 0) {
4466 //chunk = offset / dev->nDataBytesPerChunk + 1;
4467 //start = offset % dev->nDataBytesPerChunk;
4468 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4469 chunk++;
4470
4471 /* OK now check for the curveball where the start and end are in
4b070809 4472 * the same chunk.
0e8cc8bd
WJ		 4473 */
4474 if ((start + n) < dev->nDataBytesPerChunk) {
4475 nToCopy = n;
4476 } else {
4477 nToCopy = dev->nDataBytesPerChunk - start;
4478 }
4479
4480 cache = yaffs_FindChunkCache(in, chunk);
4481
4482 /* If the chunk is already in the cache or it is less than a whole chunk
4483 * then use the cache (if there is caching)
4484 * else bypass the cache.
4485 */
4486 if (cache || nToCopy != dev->nDataBytesPerChunk) {
4487 if (dev->nShortOpCaches > 0) {
4488
4489 /* If we can't find the data in the cache, then load it up. */
4490
4491 if (!cache) {
4492 cache = yaffs_GrabChunkCache(in->myDev);
4493 cache->object = in;
4494 cache->chunkId = chunk;
4495 cache->dirty = 0;
4496 cache->locked = 0;
4497 yaffs_ReadChunkDataFromObject(in, chunk,
4498 cache->
4499 data);
4500 cache->nBytes = 0;
4501 }
4502
4503 yaffs_UseChunkCache(dev, cache, 0);
4504
4505 cache->locked = 1;
4506
4507#ifdef CONFIG_YAFFS_WINCE
4508 yfsd_UnlockYAFFS(TRUE);
4509#endif
4510 memcpy(buffer, &cache->data[start], nToCopy);
4511
4512#ifdef CONFIG_YAFFS_WINCE
4513 yfsd_LockYAFFS(TRUE);
4514#endif
4515 cache->locked = 0;
4516 } else {
4517 /* Read into the local buffer then copy..*/
4518
4519 __u8 *localBuffer =
4520 yaffs_GetTempBuffer(dev, __LINE__);
4521 yaffs_ReadChunkDataFromObject(in, chunk,
4522 localBuffer);
4523#ifdef CONFIG_YAFFS_WINCE
4524 yfsd_UnlockYAFFS(TRUE);
4525#endif
4526 memcpy(buffer, &localBuffer[start], nToCopy);
4527
4528#ifdef CONFIG_YAFFS_WINCE
4529 yfsd_LockYAFFS(TRUE);
4530#endif
4531 yaffs_ReleaseTempBuffer(dev, localBuffer,
4532 __LINE__);
4533 }
4534
4535 } else {
4536#ifdef CONFIG_YAFFS_WINCE
4537 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4538
4539 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4540 * This is because we otherwise screw up WinCE's memory mapper
4541 */
4542 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
4543
4544#ifdef CONFIG_YAFFS_WINCE
4545 yfsd_UnlockYAFFS(TRUE);
4546#endif
4547 memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
4548
4549#ifdef CONFIG_YAFFS_WINCE
4550 yfsd_LockYAFFS(TRUE);
4551 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4552#endif
4553
4554#else
4555 /* A full chunk. Read directly into the supplied buffer. */
4556 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4557#endif
4558 }
4559
4560 n -= nToCopy;
4561 offset += nToCopy;
4562 buffer += nToCopy;
4563 nDone += nToCopy;
4564
4565 }
4566
4567 return nDone;
4568}
4569
4570int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
4571 int nBytes, int writeThrough)
4572{
4573
4754c823
MV		 4574 __u32 chunk = 0;
4575 __u32 start = 0;
0e8cc8bd
WJ		 4576 int nToCopy;
4577 int n = nBytes;
4578 int nDone = 0;
4579 int nToWriteBack;
4580 int startOfWrite = offset;
4581 int chunkWritten = 0;
4582 int nBytesRead;
4583
4584 yaffs_Device *dev;
4585
4586 dev = in->myDev;
4587
4588 while (n > 0 && chunkWritten >= 0) {
4589 //chunk = offset / dev->nDataBytesPerChunk + 1;
4590 //start = offset % dev->nDataBytesPerChunk;
4591 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4592 chunk++;
4593
4594 /* OK now check for the curveball where the start and end are in
4595 * the same chunk.
4596 */
4597
4598 if ((start + n) < dev->nDataBytesPerChunk) {
4599 nToCopy = n;
4600
4601 /* Now folks, to calculate how many bytes to write back....
4602 * If we're overwriting and not writing to then end of file then
4603 * we need to write back as much as was there before.
4604 */
4605
4606 nBytesRead =
4607 in->variant.fileVariant.fileSize -
4608 ((chunk - 1) * dev->nDataBytesPerChunk);
4609
4610 if (nBytesRead > dev->nDataBytesPerChunk) {
4611 nBytesRead = dev->nDataBytesPerChunk;
4612 }
4613
4614 nToWriteBack =
4615 (nBytesRead >
4616 (start + n)) ? nBytesRead : (start + n);
4617
4618 } else {
4619 nToCopy = dev->nDataBytesPerChunk - start;
4620 nToWriteBack = dev->nDataBytesPerChunk;
4621 }
4622
4623 if (nToCopy != dev->nDataBytesPerChunk) {
4624 /* An incomplete start or end chunk (or maybe both start and end chunk) */
4625 if (dev->nShortOpCaches > 0) {
4626 yaffs_ChunkCache *cache;
4627 /* If we can't find the data in the cache, then load the cache */
4628 cache = yaffs_FindChunkCache(in, chunk);
4b070809 4629
0e8cc8bd
WJ		 4630 if (!cache
4631 && yaffs_CheckSpaceForAllocation(in->
4632 myDev)) {
4633 cache = yaffs_GrabChunkCache(in->myDev);
4634 cache->object = in;
4635 cache->chunkId = chunk;
4636 cache->dirty = 0;
4637 cache->locked = 0;
4638 yaffs_ReadChunkDataFromObject(in, chunk,
4639 cache->
4640 data);
4641 }
4b070809
WD		 4642 else if(cache &&
4643 !cache->dirty &&
0e8cc8bd
WJ		 4644 !yaffs_CheckSpaceForAllocation(in->myDev)){
4645 /* Drop the cache if it was a read cache item and
4646 * no space check has been made for it.
4b070809 4647 */
0e8cc8bd
WJ		 4648 cache = NULL;
4649 }
4650
4651 if (cache) {
4652 yaffs_UseChunkCache(dev, cache, 1);
4653 cache->locked = 1;
4654#ifdef CONFIG_YAFFS_WINCE
4655 yfsd_UnlockYAFFS(TRUE);
4656#endif
4657
4658 memcpy(&cache->data[start], buffer,
4659 nToCopy);
4660
4661#ifdef CONFIG_YAFFS_WINCE
4662 yfsd_LockYAFFS(TRUE);
4663#endif
4664 cache->locked = 0;
4665 cache->nBytes = nToWriteBack;
4666
4667 if (writeThrough) {
4668 chunkWritten =
4669 yaffs_WriteChunkDataToObject
4670 (cache->object,
4671 cache->chunkId,
4672 cache->data, cache->nBytes,
4673 1);
4674 cache->dirty = 0;
4675 }
4676
4677 } else {
4678 chunkWritten = -1; /* fail the write */
4679 }
4680 } else {
4681 /* An incomplete start or end chunk (or maybe both start and end chunk)
4682 * Read into the local buffer then copy, then copy over and write back.
4683 */
4684
4685 __u8 *localBuffer =
4686 yaffs_GetTempBuffer(dev, __LINE__);
4687
4688 yaffs_ReadChunkDataFromObject(in, chunk,
4689 localBuffer);
4690
4691#ifdef CONFIG_YAFFS_WINCE
4692 yfsd_UnlockYAFFS(TRUE);
4693#endif
4694
4695 memcpy(&localBuffer[start], buffer, nToCopy);
4696
4697#ifdef CONFIG_YAFFS_WINCE
4698 yfsd_LockYAFFS(TRUE);
4699#endif
4700 chunkWritten =
4701 yaffs_WriteChunkDataToObject(in, chunk,
4702 localBuffer,
4703 nToWriteBack,
4704 0);
4705
4706 yaffs_ReleaseTempBuffer(dev, localBuffer,
4707 __LINE__);
4708
4709 }
4710
4711 } else {
4712
4713#ifdef CONFIG_YAFFS_WINCE
4714 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4715 * This is because we otherwise screw up WinCE's memory mapper
4716 */
4717 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4718#ifdef CONFIG_YAFFS_WINCE
4719 yfsd_UnlockYAFFS(TRUE);
4720#endif
4721 memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
4722#ifdef CONFIG_YAFFS_WINCE
4723 yfsd_LockYAFFS(TRUE);
4724#endif
4725 chunkWritten =
4726 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
4727 dev->nDataBytesPerChunk,
4728 0);
4729 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4730#else
4731 /* A full chunk. Write directly from the supplied buffer. */
4732 chunkWritten =
4733 yaffs_WriteChunkDataToObject(in, chunk, buffer,
4734 dev->nDataBytesPerChunk,
4735 0);
4736#endif
4737 /* Since we've overwritten the cached data, we better invalidate it. */
4738 yaffs_InvalidateChunkCache(in, chunk);
4739 }
4740
4741 if (chunkWritten >= 0) {
4742 n -= nToCopy;
4743 offset += nToCopy;
4744 buffer += nToCopy;
4745 nDone += nToCopy;
4746 }
4747
4748 }
4749
4750 /* Update file object */
4751
4752 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
4753 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4754 }
4755
4756 in->dirty = 1;
4757
4758 return nDone;
4759}
4760
4761
4762/* ---------------------- File resizing stuff ------------------ */
4763
4764static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
4765{
4766
4767 yaffs_Device *dev = in->myDev;
4768 int oldFileSize = in->variant.fileVariant.fileSize;
4769
4770 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4771
4772 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4773 dev->nDataBytesPerChunk;
4774 int i;
4775 int chunkId;
4776
4777 /* Delete backwards so that we don't end up with holes if
4778 * power is lost part-way through the operation.
4779 */
4780 for (i = lastDel; i >= startDel; i--) {
4781 /* NB this could be optimised somewhat,
4782 * eg. could retrieve the tags and write them without
4783 * using yaffs_DeleteChunk
4784 */
4785
4786 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4787 if (chunkId > 0) {
4788 if (chunkId <
4789 (dev->internalStartBlock * dev->nChunksPerBlock)
4790 || chunkId >=
4791 ((dev->internalEndBlock +
4792 1) * dev->nChunksPerBlock)) {
4793 T(YAFFS_TRACE_ALWAYS,
4794 (TSTR("Found daft chunkId %d for %d" TENDSTR),
4795 chunkId, i));
4796 } else {
4797 in->nDataChunks--;
4798 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4799 }
4800 }
4801 }
4802
4803}
4804
4805int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
4806{
4807
4808 int oldFileSize = in->variant.fileVariant.fileSize;
4754c823
MV		 4809 __u32 newSizeOfPartialChunk = 0;
4810 __u32 newFullChunks = 0;
4b070809 4811
0e8cc8bd
WJ		 4812 yaffs_Device *dev = in->myDev;
4813
4814 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4815
4816 yaffs_FlushFilesChunkCache(in);
4817 yaffs_InvalidateWholeChunkCache(in);
4818
4819 yaffs_CheckGarbageCollection(dev);
4820
4821 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
4822 return yaffs_GetFileSize(in);
4823 }
4824
4825 if (newSize == oldFileSize) {
4826 return oldFileSize;
4827 }
4828
4829 if (newSize < oldFileSize) {
4830
4831 yaffs_PruneResizedChunks(in, newSize);
4832
4833 if (newSizeOfPartialChunk != 0) {
4834 int lastChunk = 1 + newFullChunks;
4b070809 4835
0e8cc8bd
WJ		 4836 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4837
4838 /* Got to read and rewrite the last chunk with its new size and zero pad */
4839 yaffs_ReadChunkDataFromObject(in, lastChunk,
4840 localBuffer);
4841
4842 memset(localBuffer + newSizeOfPartialChunk, 0,
4843 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
4844
4845 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
4846 newSizeOfPartialChunk, 1);
4847
4848 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4849 }
4850
4851 in->variant.fileVariant.fileSize = newSize;
4852
4853 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
4854 } else {
4855 /* newsSize > oldFileSize */
4856 in->variant.fileVariant.fileSize = newSize;
4857 }
4858
4b070809
WD		 4859
4860
0e8cc8bd
WJ		 4861 /* Write a new object header.
4862 * show we've shrunk the file, if need be
4863 * Do this only if the file is not in the deleted directories.
4864 */
4865 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
4866 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
4867 yaffs_UpdateObjectHeader(in, NULL, 0,
4868 (newSize < oldFileSize) ? 1 : 0, 0);
4869 }
4870
4871 return YAFFS_OK;
4872}
4873
4874loff_t yaffs_GetFileSize(yaffs_Object * obj)
4875{
4876 obj = yaffs_GetEquivalentObject(obj);
4877
4878 switch (obj->variantType) {
4879 case YAFFS_OBJECT_TYPE_FILE:
4880 return obj->variant.fileVariant.fileSize;
4881 case YAFFS_OBJECT_TYPE_SYMLINK:
4882 return yaffs_strlen(obj->variant.symLinkVariant.alias);
4883 default:
4884 return 0;
4885 }
4886}
4887
4888
4889
4890int yaffs_FlushFile(yaffs_Object * in, int updateTime)
4891{
4892 int retVal;
4893 if (in->dirty) {
4894 yaffs_FlushFilesChunkCache(in);
4895 if (updateTime) {
4896#ifdef CONFIG_YAFFS_WINCE
4897 yfsd_WinFileTimeNow(in->win_mtime);
4898#else
4899
4900 in->yst_mtime = Y_CURRENT_TIME;
4901
4902#endif
4903 }
4904
4905 retVal =
4906 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
4907 0) ? YAFFS_OK : YAFFS_FAIL;
4908 } else {
4909 retVal = YAFFS_OK;
4910 }
4911
4912 return retVal;
4913
4914}
4915
4916static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
4917{
4918
4919 /* First off, invalidate the file's data in the cache, without flushing. */
4920 yaffs_InvalidateWholeChunkCache(in);
4921
4922 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
4923 /* Move to the unlinked directory so we have a record that it was deleted. */
4924 yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
4925
4926 }
4927
4928 yaffs_RemoveObjectFromDirectory(in);
4929 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
4930 in->chunkId = -1;
4931
4932 yaffs_FreeObject(in);
4933 return YAFFS_OK;
4934
4935}
4936
4937/* yaffs_DeleteFile deletes the whole file data
4938 * and the inode associated with the file.
4939 * It does not delete the links associated with the file.
4940 */
4941static int yaffs_UnlinkFile(yaffs_Object * in)
4942{
4943
4944 int retVal;
4945 int immediateDeletion = 0;
4946
4947 if (1) {
90ef117b
WJ		 4948/* XXX U-BOOT XXX */
4949#if 0
0e8cc8bd
WJ		 4950#ifdef __KERNEL__
4951 if (!in->myInode) {
4952 immediateDeletion = 1;
4953
4954 }
90ef117b 4955#endif
0e8cc8bd
WJ		 4956#else
4957 if (in->inUse <= 0) {
4958 immediateDeletion = 1;
4959
4960 }
4961#endif
4962 if (immediateDeletion) {
4963 retVal =
4964 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
4965 "deleted", 0, 0);
4966 T(YAFFS_TRACE_TRACING,
4967 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
4968 in->objectId));
4969 in->deleted = 1;
4970 in->myDev->nDeletedFiles++;
4971 if (0 && in->myDev->isYaffs2) {
4972 yaffs_ResizeFile(in, 0);
4973 }
4974 yaffs_SoftDeleteFile(in);
4975 } else {
4976 retVal =
4977 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
4978 "unlinked", 0, 0);
4979 }
4980
4981 }
4982 return retVal;
4983}
4984
4985int yaffs_DeleteFile(yaffs_Object * in)
4986{
4987 int retVal = YAFFS_OK;
4988
4989 if (in->nDataChunks > 0) {
4990 /* Use soft deletion if there is data in the file */
4991 if (!in->unlinked) {
4992 retVal = yaffs_UnlinkFile(in);
4993 }
4994 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
4995 in->deleted = 1;
4996 in->myDev->nDeletedFiles++;
4997 yaffs_SoftDeleteFile(in);
4998 }
4999 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
5000 } else {
5001 /* The file has no data chunks so we toss it immediately */
5002 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5003 in->variant.fileVariant.top = NULL;
5004 yaffs_DoGenericObjectDeletion(in);
5005
5006 return YAFFS_OK;
5007 }
5008}
5009
5010static int yaffs_DeleteDirectory(yaffs_Object * in)
5011{
5012 /* First check that the directory is empty. */
5013 if (list_empty(&in->variant.directoryVariant.children)) {
5014 return yaffs_DoGenericObjectDeletion(in);
5015 }
5016
5017 return YAFFS_FAIL;
5018
5019}
5020
5021static int yaffs_DeleteSymLink(yaffs_Object * in)
5022{
5023 YFREE(in->variant.symLinkVariant.alias);
5024
5025 return yaffs_DoGenericObjectDeletion(in);
5026}
5027
5028static int yaffs_DeleteHardLink(yaffs_Object * in)
5029{
5030 /* remove this hardlink from the list assocaited with the equivalent
5031 * object
5032 */
5033 list_del(&in->hardLinks);
5034 return yaffs_DoGenericObjectDeletion(in);
5035}
5036
5037static void yaffs_DestroyObject(yaffs_Object * obj)
5038{
5039 switch (obj->variantType) {
5040 case YAFFS_OBJECT_TYPE_FILE:
5041 yaffs_DeleteFile(obj);
5042 break;
5043 case YAFFS_OBJECT_TYPE_DIRECTORY:
5044 yaffs_DeleteDirectory(obj);
5045 break;
5046 case YAFFS_OBJECT_TYPE_SYMLINK:
5047 yaffs_DeleteSymLink(obj);
5048 break;
5049 case YAFFS_OBJECT_TYPE_HARDLINK:
5050 yaffs_DeleteHardLink(obj);
5051 break;
5052 case YAFFS_OBJECT_TYPE_SPECIAL:
5053 yaffs_DoGenericObjectDeletion(obj);
5054 break;
5055 case YAFFS_OBJECT_TYPE_UNKNOWN:
5056 break; /* should not happen. */
5057 }
5058}
5059
5060static int yaffs_UnlinkWorker(yaffs_Object * obj)
5061{
5062
5063 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5064 return yaffs_DeleteHardLink(obj);
5065 } else if (!list_empty(&obj->hardLinks)) {
5066 /* Curve ball: We're unlinking an object that has a hardlink.
5067 *
5068 * This problem arises because we are not strictly following
5069 * The Linux link/inode model.
5070 *
5071 * We can't really delete the object.
5072 * Instead, we do the following:
5073 * - Select a hardlink.
5074 * - Unhook it from the hard links
5075 * - Unhook it from its parent directory (so that the rename can work)
5076 * - Rename the object to the hardlink's name.
5077 * - Delete the hardlink
5078 */
5079
5080 yaffs_Object *hl;
5081 int retVal;
5082 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5083
5084 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5085
5086 list_del_init(&hl->hardLinks);
5087 list_del_init(&hl->siblings);
5088
5089 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5090
5091 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5092
5093 if (retVal == YAFFS_OK) {
5094 retVal = yaffs_DoGenericObjectDeletion(hl);
5095 }
5096 return retVal;
5097
5098 } else {
5099 switch (obj->variantType) {
5100 case YAFFS_OBJECT_TYPE_FILE:
5101 return yaffs_UnlinkFile(obj);
5102 break;
5103 case YAFFS_OBJECT_TYPE_DIRECTORY:
5104 return yaffs_DeleteDirectory(obj);
5105 break;
5106 case YAFFS_OBJECT_TYPE_SYMLINK:
5107 return yaffs_DeleteSymLink(obj);
5108 break;
5109 case YAFFS_OBJECT_TYPE_SPECIAL:
5110 return yaffs_DoGenericObjectDeletion(obj);
5111 break;
5112 case YAFFS_OBJECT_TYPE_HARDLINK:
5113 case YAFFS_OBJECT_TYPE_UNKNOWN:
5114 default:
5115 return YAFFS_FAIL;
5116 }
5117 }
5118}
5119
5120
5121static int yaffs_UnlinkObject( yaffs_Object *obj)
5122{
5123
5124 if (obj && obj->unlinkAllowed) {
5125 return yaffs_UnlinkWorker(obj);
5126 }
5127
5128 return YAFFS_FAIL;
5129
5130}
5131int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
5132{
5133 yaffs_Object *obj;
5134
5135 obj = yaffs_FindObjectByName(dir, name);
5136 return yaffs_UnlinkObject(obj);
5137}
5138
5139/*----------------------- Initialisation Scanning ---------------------- */
5140
5141static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
5142 int backwardScanning)
5143{
5144 yaffs_Object *obj;
5145
5146 if (!backwardScanning) {
5147 /* Handle YAFFS1 forward scanning case
5148 * For YAFFS1 we always do the deletion
5149 */
5150
5151 } else {
5152 /* Handle YAFFS2 case (backward scanning)
5153 * If the shadowed object exists then ignore.
5154 */
5155 if (yaffs_FindObjectByNumber(dev, objId)) {
5156 return;
5157 }
5158 }
5159
5160 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5161 * We put it in unlinked dir to be cleaned up after the scanning
5162 */
5163 obj =
5164 yaffs_FindOrCreateObjectByNumber(dev, objId,
5165 YAFFS_OBJECT_TYPE_FILE);
5166 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5167 obj->variant.fileVariant.shrinkSize = 0;
5168 obj->valid = 1; /* So that we don't read any other info for this file */
5169
5170}
5171
5172typedef struct {
5173 int seq;
5174 int block;
5175} yaffs_BlockIndex;
5176
5177
5178static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5179{
5180 yaffs_Object *hl;
5181 yaffs_Object *in;
4b070809 5182
0e8cc8bd
WJ		 5183 while (hardList) {
5184 hl = hardList;
5185 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5186
5187 in = yaffs_FindObjectByNumber(dev,
5188 hl->variant.hardLinkVariant.
5189 equivalentObjectId);
5190
5191 if (in) {
5192 /* Add the hardlink pointers */
5193 hl->variant.hardLinkVariant.equivalentObject = in;
5194 list_add(&hl->hardLinks, &in->hardLinks);
5195 } else {
5196 /* Todo Need to report/handle this better.
5197 * Got a problem... hardlink to a non-existant object
5198 */
5199 hl->variant.hardLinkVariant.equivalentObject = NULL;
5200 INIT_LIST_HEAD(&hl->hardLinks);
5201
5202 }
5203
5204 }
5205
5206}
5207
5208
5209
5210
5211
5212static int ybicmp(const void *a, const void *b){
5213 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5214 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5215 register int ablock = ((yaffs_BlockIndex *)a)->block;
5216 register int bblock = ((yaffs_BlockIndex *)b)->block;
5217 if( aseq == bseq )
4b070809 5218 return ablock - bblock;
0e8cc8bd 5219 else
4b070809 5220 return aseq - bseq;
0e8cc8bd
WJ		 5221
5222}
5223
5224static int yaffs_Scan(yaffs_Device * dev)
5225{
5226 yaffs_ExtendedTags tags;
5227 int blk;
5228 int blockIterator;
5229 int startIterator;
5230 int endIterator;
5231 int nBlocksToScan = 0;
0e8cc8bd
WJ		 5232
5233 int chunk;
5234 int c;
5235 int deleted;
5236 yaffs_BlockState state;
5237 yaffs_Object *hardList = NULL;
5238 yaffs_BlockInfo *bi;
5239 int sequenceNumber;
5240 yaffs_ObjectHeader *oh;
5241 yaffs_Object *in;
5242 yaffs_Object *parent;
5243 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4b070809 5244
0e8cc8bd 5245 int alloc_failed = 0;
4b070809 5246
0e8cc8bd
WJ		 5247
5248 __u8 *chunkData;
5249
5250 yaffs_BlockIndex *blockIndex = NULL;
5251
5252 if (dev->isYaffs2) {
5253 T(YAFFS_TRACE_SCAN,
5254 (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
5255 return YAFFS_FAIL;
5256 }
4b070809 5257
0e8cc8bd 5258 //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
4b070809 5259
0e8cc8bd
WJ		 5260 T(YAFFS_TRACE_SCAN,
5261 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5262 dev->internalStartBlock, dev->internalEndBlock));
5263
5264 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5265
5266 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5267
5268 if (dev->isYaffs2) {
5269 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5270 if(!blockIndex)
5271 return YAFFS_FAIL;
5272 }
5273
5274 /* Scan all the blocks to determine their state */
5275 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5276 bi = yaffs_GetBlockInfo(dev, blk);
5277 yaffs_ClearChunkBits(dev, blk);
5278 bi->pagesInUse = 0;
5279 bi->softDeletions = 0;
5280
5281 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5282
5283 bi->blockState = state;
5284 bi->sequenceNumber = sequenceNumber;
5285
5286 T(YAFFS_TRACE_SCAN_DEBUG,
5287 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5288 state, sequenceNumber));
5289
5290 if (state == YAFFS_BLOCK_STATE_DEAD) {
5291 T(YAFFS_TRACE_BAD_BLOCKS,
5292 (TSTR("block %d is bad" TENDSTR), blk));
5293 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5294 T(YAFFS_TRACE_SCAN_DEBUG,
5295 (TSTR("Block empty " TENDSTR)));
5296 dev->nErasedBlocks++;
5297 dev->nFreeChunks += dev->nChunksPerBlock;
5298 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5299
5300 /* Determine the highest sequence number */
5301 if (dev->isYaffs2 &&
5302 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5303 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5304
5305 blockIndex[nBlocksToScan].seq = sequenceNumber;
5306 blockIndex[nBlocksToScan].block = blk;
5307
5308 nBlocksToScan++;
5309
5310 if (sequenceNumber >= dev->sequenceNumber) {
5311 dev->sequenceNumber = sequenceNumber;
5312 }
5313 } else if (dev->isYaffs2) {
5314 /* TODO: Nasty sequence number! */
5315 T(YAFFS_TRACE_SCAN,
5316 (TSTR
5317 ("Block scanning block %d has bad sequence number %d"
5318 TENDSTR), blk, sequenceNumber));
5319
5320 }
5321 }
5322 }
5323
5324 /* Sort the blocks
5325 * Dungy old bubble sort for now...
5326 */
5327 if (dev->isYaffs2) {
5328 yaffs_BlockIndex temp;
5329 int i;
5330 int j;
5331
5332 for (i = 0; i < nBlocksToScan; i++)
5333 for (j = i + 1; j < nBlocksToScan; j++)
5334 if (blockIndex[i].seq > blockIndex[j].seq) {
5335 temp = blockIndex[j];
5336 blockIndex[j] = blockIndex[i];
5337 blockIndex[i] = temp;
5338 }
5339 }
5340
5341 /* Now scan the blocks looking at the data. */
5342 if (dev->isYaffs2) {
5343 startIterator = 0;
5344 endIterator = nBlocksToScan - 1;
5345 T(YAFFS_TRACE_SCAN_DEBUG,
5346 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5347 } else {
5348 startIterator = dev->internalStartBlock;
5349 endIterator = dev->internalEndBlock;
5350 }
5351
5352 /* For each block.... */
5353 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5354 blockIterator++) {
5355
5356 if (dev->isYaffs2) {
5357 /* get the block to scan in the correct order */
5358 blk = blockIndex[blockIterator].block;
5359 } else {
5360 blk = blockIterator;
5361 }
5362
5363 bi = yaffs_GetBlockInfo(dev, blk);
5364 state = bi->blockState;
5365
5366 deleted = 0;
5367
5368 /* For each chunk in each block that needs scanning....*/
5369 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5370 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5371 /* Read the tags and decide what to do */
5372 chunk = blk * dev->nChunksPerBlock + c;
5373
360ab450 5374 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
0e8cc8bd
WJ		 5375 &tags);
5376
5377 /* Let's have a good look at this chunk... */
5378
5379 if (!dev->isYaffs2 && tags.chunkDeleted) {
5380 /* YAFFS1 only...
5381 * A deleted chunk
5382 */
5383 deleted++;
5384 dev->nFreeChunks++;
5385 /*T((" %d %d deleted\n",blk,c)); */
5386 } else if (!tags.chunkUsed) {
5387 /* An unassigned chunk in the block
4b070809 5388 * This means that either the block is empty or
0e8cc8bd
WJ		 5389 * this is the one being allocated from
5390 */
5391
5392 if (c == 0) {
5393 /* We're looking at the first chunk in the block so the block is unused */
5394 state = YAFFS_BLOCK_STATE_EMPTY;
5395 dev->nErasedBlocks++;
5396 } else {
5397 /* this is the block being allocated from */
5398 T(YAFFS_TRACE_SCAN,
5399 (TSTR
5400 (" Allocating from %d %d" TENDSTR),
5401 blk, c));
5402 state = YAFFS_BLOCK_STATE_ALLOCATING;
5403 dev->allocationBlock = blk;
5404 dev->allocationPage = c;
4b070809 5405 dev->allocationBlockFinder = blk;
0e8cc8bd 5406 /* Set it to here to encourage the allocator to go forth from here. */
4b070809 5407
0e8cc8bd
WJ		 5408 /* Yaffs2 sanity check:
5409 * This should be the one with the highest sequence number
5410 */
5411 if (dev->isYaffs2
5412 && (dev->sequenceNumber !=
5413 bi->sequenceNumber)) {
5414 T(YAFFS_TRACE_ALWAYS,
5415 (TSTR
5416 ("yaffs: Allocation block %d was not highest sequence id:"
5417 " block seq = %d, dev seq = %d"
5418 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
5419 }
5420 }
5421
5422 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5423 } else if (tags.chunkId > 0) {
5424 /* chunkId > 0 so it is a data chunk... */
5425 unsigned int endpos;
5426
5427 yaffs_SetChunkBit(dev, blk, c);
5428 bi->pagesInUse++;
5429
5430 in = yaffs_FindOrCreateObjectByNumber(dev,
5431 tags.
5432 objectId,
5433 YAFFS_OBJECT_TYPE_FILE);
5434 /* PutChunkIntoFile checks for a clash (two data chunks with
5435 * the same chunkId).
5436 */
4b070809 5437
0e8cc8bd
WJ		 5438 if(!in)
5439 alloc_failed = 1;
5440
5441 if(in){
5442 if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
5443 alloc_failed = 1;
5444 }
4b070809 5445
0e8cc8bd
WJ		 5446 endpos =
5447 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5448 tags.byteCount;
4b070809 5449 if (in &&
0e8cc8bd
WJ		 5450 in->variantType == YAFFS_OBJECT_TYPE_FILE
5451 && in->variant.fileVariant.scannedFileSize <
5452 endpos) {
5453 in->variant.fileVariant.
5454 scannedFileSize = endpos;
5455 if (!dev->useHeaderFileSize) {
5456 in->variant.fileVariant.
5457 fileSize =
5458 in->variant.fileVariant.
5459 scannedFileSize;
5460 }
5461
5462 }
5463 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5464 } else {
5465 /* chunkId == 0, so it is an ObjectHeader.
5466 * Thus, we read in the object header and make the object
5467 */
5468 yaffs_SetChunkBit(dev, blk, c);
5469 bi->pagesInUse++;
5470
360ab450 5471 yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
0e8cc8bd
WJ		 5472 chunkData,
5473 NULL);
5474
5475 oh = (yaffs_ObjectHeader *) chunkData;
5476
5477 in = yaffs_FindObjectByNumber(dev,
5478 tags.objectId);
5479 if (in && in->variantType != oh->type) {
5480 /* This should not happen, but somehow
4b070809 5481 * Wev'e ended up with an objectId that has been reused but not yet
0e8cc8bd
WJ		 5482 * deleted, and worse still it has changed type. Delete the old object.
5483 */
5484
5485 yaffs_DestroyObject(in);
5486
5487 in = 0;
5488 }
5489
5490 in = yaffs_FindOrCreateObjectByNumber(dev,
5491 tags.
5492 objectId,
5493 oh->type);
5494
5495 if(!in)
5496 alloc_failed = 1;
4b070809 5497
0e8cc8bd
WJ		 5498 if (in && oh->shadowsObject > 0) {
5499 yaffs_HandleShadowedObject(dev,
5500 oh->
5501 shadowsObject,
5502 0);
5503 }
5504
5505 if (in && in->valid) {
5506 /* We have already filled this one. We have a duplicate and need to resolve it. */
5507
5508 unsigned existingSerial = in->serial;
5509 unsigned newSerial = tags.serialNumber;
5510
5511 if (dev->isYaffs2 ||
5512 ((existingSerial + 1) & 3) ==
5513 newSerial) {
5514 /* Use new one - destroy the exisiting one */
5515 yaffs_DeleteChunk(dev,
5516 in->chunkId,
5517 1, __LINE__);
5518 in->valid = 0;
5519 } else {
5520 /* Use existing - destroy this one. */
5521 yaffs_DeleteChunk(dev, chunk, 1,
5522 __LINE__);
5523 }
5524 }
5525
5526 if (in && !in->valid &&
5527 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5528 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5529 /* We only load some info, don't fiddle with directory structure */
5530 in->valid = 1;
5531 in->variantType = oh->type;
5532
5533 in->yst_mode = oh->yst_mode;
5534#ifdef CONFIG_YAFFS_WINCE
5535 in->win_atime[0] = oh->win_atime[0];
5536 in->win_ctime[0] = oh->win_ctime[0];
5537 in->win_mtime[0] = oh->win_mtime[0];
5538 in->win_atime[1] = oh->win_atime[1];
5539 in->win_ctime[1] = oh->win_ctime[1];
5540 in->win_mtime[1] = oh->win_mtime[1];
5541#else
5542 in->yst_uid = oh->yst_uid;
5543 in->yst_gid = oh->yst_gid;
5544 in->yst_atime = oh->yst_atime;
5545 in->yst_mtime = oh->yst_mtime;
5546 in->yst_ctime = oh->yst_ctime;
5547 in->yst_rdev = oh->yst_rdev;
5548#endif
5549 in->chunkId = chunk;
5550
5551 } else if (in && !in->valid) {
5552 /* we need to load this info */
5553
5554 in->valid = 1;
5555 in->variantType = oh->type;
5556
5557 in->yst_mode = oh->yst_mode;
5558#ifdef CONFIG_YAFFS_WINCE
5559 in->win_atime[0] = oh->win_atime[0];
5560 in->win_ctime[0] = oh->win_ctime[0];
5561 in->win_mtime[0] = oh->win_mtime[0];
5562 in->win_atime[1] = oh->win_atime[1];
5563 in->win_ctime[1] = oh->win_ctime[1];
5564 in->win_mtime[1] = oh->win_mtime[1];
5565#else
5566 in->yst_uid = oh->yst_uid;
5567 in->yst_gid = oh->yst_gid;
5568 in->yst_atime = oh->yst_atime;
5569 in->yst_mtime = oh->yst_mtime;
5570 in->yst_ctime = oh->yst_ctime;
5571 in->yst_rdev = oh->yst_rdev;
5572#endif
5573 in->chunkId = chunk;
5574
5575 yaffs_SetObjectName(in, oh->name);
5576 in->dirty = 0;
5577
5578 /* directory stuff...
5579 * hook up to parent
5580 */
5581
5582 parent =
5583 yaffs_FindOrCreateObjectByNumber
5584 (dev, oh->parentObjectId,
5585 YAFFS_OBJECT_TYPE_DIRECTORY);
5586 if (parent->variantType ==
5587 YAFFS_OBJECT_TYPE_UNKNOWN) {
5588 /* Set up as a directory */
5589 parent->variantType =
5590 YAFFS_OBJECT_TYPE_DIRECTORY;
5591 INIT_LIST_HEAD(&parent->variant.
5592 directoryVariant.
5593 children);
5594 } else if (parent->variantType !=
5595 YAFFS_OBJECT_TYPE_DIRECTORY)
5596 {
5597 /* Hoosterman, another problem....
5598 * We're trying to use a non-directory as a directory
5599 */
5600
5601 T(YAFFS_TRACE_ERROR,
5602 (TSTR
5603 ("yaffs tragedy: attempting to use non-directory as"
5604 " a directory in scan. Put in lost+found."
5605 TENDSTR)));
5606 parent = dev->lostNFoundDir;
5607 }
5608
5609 yaffs_AddObjectToDirectory(parent, in);
5610
5611 if (0 && (parent == dev->deletedDir ||
5612 parent == dev->unlinkedDir)) {
5613 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
5614 dev->nDeletedFiles++;
5615 }
5616 /* Note re hardlinks.
5617 * Since we might scan a hardlink before its equivalent object is scanned
5618 * we put them all in a list.
5619 * After scanning is complete, we should have all the objects, so we run through this
4b070809 5620 * list and fix up all the chains.
0e8cc8bd
WJ		 5621 */
5622
5623 switch (in->variantType) {
4b070809 5624 case YAFFS_OBJECT_TYPE_UNKNOWN:
0e8cc8bd
WJ		 5625 /* Todo got a problem */
5626 break;
5627 case YAFFS_OBJECT_TYPE_FILE:
5628 if (dev->isYaffs2
5629 && oh->isShrink) {
5630 /* Prune back the shrunken chunks */
5631 yaffs_PruneResizedChunks
5632 (in, oh->fileSize);
5633 /* Mark the block as having a shrinkHeader */
5634 bi->hasShrinkHeader = 1;
5635 }
5636
5637 if (dev->useHeaderFileSize)
5638
5639 in->variant.fileVariant.
5640 fileSize =
5641 oh->fileSize;
5642
5643 break;
5644 case YAFFS_OBJECT_TYPE_HARDLINK:
5645 in->variant.hardLinkVariant.
5646 equivalentObjectId =
5647 oh->equivalentObjectId;
5648 in->hardLinks.next =
5649 (struct list_head *)
5650 hardList;
5651 hardList = in;
5652 break;
5653 case YAFFS_OBJECT_TYPE_DIRECTORY:
5654 /* Do nothing */
5655 break;
5656 case YAFFS_OBJECT_TYPE_SPECIAL:
5657 /* Do nothing */
5658 break;
4b070809 5659 case YAFFS_OBJECT_TYPE_SYMLINK:
0e8cc8bd
WJ		 5660 in->variant.symLinkVariant.alias =
5661 yaffs_CloneString(oh->alias);
5662 if(!in->variant.symLinkVariant.alias)
5663 alloc_failed = 1;
5664 break;
5665 }
5666
5667 if (parent == dev->deletedDir) {
5668 yaffs_DestroyObject(in);
5669 bi->hasShrinkHeader = 1;
5670 }
5671 }
5672 }
5673 }
5674
5675 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5676 /* If we got this far while scanning, then the block is fully allocated.*/
5677 state = YAFFS_BLOCK_STATE_FULL;
5678 }
5679
5680 bi->blockState = state;
5681
5682 /* Now let's see if it was dirty */
5683 if (bi->pagesInUse == 0 &&
5684 !bi->hasShrinkHeader &&
5685 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5686 yaffs_BlockBecameDirty(dev, blk);
5687 }
5688
5689 }
5690
5691 if (blockIndex) {
5692 YFREE(blockIndex);
5693 }
4b070809
WD		 5694
5695
0e8cc8bd
WJ		 5696 /* Ok, we've done all the scanning.
5697 * Fix up the hard link chains.
4b070809 5698 * We should now have scanned all the objects, now it's time to add these
0e8cc8bd
WJ		 5699 * hardlinks.
5700 */
5701
5702 yaffs_HardlinkFixup(dev,hardList);
5703
5704 /* Handle the unlinked files. Since they were left in an unlinked state we should
5705 * just delete them.
5706 */
5707 {
5708 struct list_head *i;
5709 struct list_head *n;
5710
5711 yaffs_Object *l;
5712 /* Soft delete all the unlinked files */
5713 list_for_each_safe(i, n,
5714 &dev->unlinkedDir->variant.directoryVariant.
5715 children) {
5716 if (i) {
5717 l = list_entry(i, yaffs_Object, siblings);
5718 yaffs_DestroyObject(l);
5719 }
5720 }
5721 }
5722
5723 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5724
5725 if(alloc_failed){
5726 return YAFFS_FAIL;
5727 }
4b070809 5728
0e8cc8bd 5729 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
4b070809 5730
0e8cc8bd
WJ		 5731
5732 return YAFFS_OK;
5733}
5734
5735static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5736{
5737 __u8 *chunkData;
5738 yaffs_ObjectHeader *oh;
5739 yaffs_Device *dev = in->myDev;
5740 yaffs_ExtendedTags tags;
0e8cc8bd
WJ		 5741
5742 if(!in)
5743 return;
4b070809 5744
0e8cc8bd
WJ		 5745#if 0
5746 T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
5747 in->objectId,
5748 in->lazyLoaded ? "not yet" : "already"));
5749#endif
5750
5751 if(in->lazyLoaded){
5752 in->lazyLoaded = 0;
5753 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5754
360ab450
AG		 5755 yaffs_ReadChunkWithTagsFromNAND(dev, in->chunkId,
5756 chunkData, &tags);
4b070809 5757 oh = (yaffs_ObjectHeader *) chunkData;
0e8cc8bd
WJ		 5758
5759 in->yst_mode = oh->yst_mode;
5760#ifdef CONFIG_YAFFS_WINCE
5761 in->win_atime[0] = oh->win_atime[0];
5762 in->win_ctime[0] = oh->win_ctime[0];
5763 in->win_mtime[0] = oh->win_mtime[0];
5764 in->win_atime[1] = oh->win_atime[1];
5765 in->win_ctime[1] = oh->win_ctime[1];
5766 in->win_mtime[1] = oh->win_mtime[1];
5767#else
5768 in->yst_uid = oh->yst_uid;
5769 in->yst_gid = oh->yst_gid;
5770 in->yst_atime = oh->yst_atime;
5771 in->yst_mtime = oh->yst_mtime;
5772 in->yst_ctime = oh->yst_ctime;
5773 in->yst_rdev = oh->yst_rdev;
4b070809 5774
0e8cc8bd
WJ		 5775#endif
5776 yaffs_SetObjectName(in, oh->name);
4b070809 5777
0e8cc8bd
WJ		 5778 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
5779 in->variant.symLinkVariant.alias =
5780 yaffs_CloneString(oh->alias);
0e8cc8bd 5781 }
4b070809 5782
0e8cc8bd
WJ		 5783 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
5784 }
5785}
5786
5787static int yaffs_ScanBackwards(yaffs_Device * dev)
5788{
5789 yaffs_ExtendedTags tags;
5790 int blk;
5791 int blockIterator;
5792 int startIterator;
5793 int endIterator;
5794 int nBlocksToScan = 0;
5795
5796 int chunk;
0e8cc8bd 5797 int c;
0e8cc8bd
WJ		 5798 yaffs_BlockState state;
5799 yaffs_Object *hardList = NULL;
5800 yaffs_BlockInfo *bi;
5801 int sequenceNumber;
5802 yaffs_ObjectHeader *oh;
5803 yaffs_Object *in;
5804 yaffs_Object *parent;
5805 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5806 int itsUnlinked;
5807 __u8 *chunkData;
4b070809 5808
0e8cc8bd
WJ		 5809 int fileSize;
5810 int isShrink;
5811 int foundChunksInBlock;
5812 int equivalentObjectId;
5813 int alloc_failed = 0;
4b070809 5814
0e8cc8bd
WJ		 5815
5816 yaffs_BlockIndex *blockIndex = NULL;
5817 int altBlockIndex = 0;
5818
5819 if (!dev->isYaffs2) {
5820 T(YAFFS_TRACE_SCAN,
5821 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5822 return YAFFS_FAIL;
5823 }
5824
5825 T(YAFFS_TRACE_SCAN,
5826 (TSTR
5827 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
5828 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5829
5830
5831 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5832
5833 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4b070809 5834
0e8cc8bd
WJ		 5835 if(!blockIndex) {
5836 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
5837 altBlockIndex = 1;
5838 }
4b070809 5839
0e8cc8bd
WJ		 5840 if(!blockIndex) {
5841 T(YAFFS_TRACE_SCAN,
5842 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
5843 return YAFFS_FAIL;
5844 }
4b070809 5845
0e8cc8bd 5846 dev->blocksInCheckpoint = 0;
4b070809 5847
0e8cc8bd
WJ		 5848 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5849
5850 /* Scan all the blocks to determine their state */
5851 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5852 bi = yaffs_GetBlockInfo(dev, blk);
5853 yaffs_ClearChunkBits(dev, blk);
5854 bi->pagesInUse = 0;
5855 bi->softDeletions = 0;
5856
5857 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5858
5859 bi->blockState = state;
5860 bi->sequenceNumber = sequenceNumber;
5861
5862 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
5863 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
4b070809 5864
0e8cc8bd
WJ		 5865 T(YAFFS_TRACE_SCAN_DEBUG,
5866 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5867 state, sequenceNumber));
5868
4b070809 5869
0e8cc8bd
WJ		 5870 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
5871 dev->blocksInCheckpoint++;
4b070809 5872
0e8cc8bd
WJ		 5873 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
5874 T(YAFFS_TRACE_BAD_BLOCKS,
5875 (TSTR("block %d is bad" TENDSTR), blk));
5876 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5877 T(YAFFS_TRACE_SCAN_DEBUG,
5878 (TSTR("Block empty " TENDSTR)));
5879 dev->nErasedBlocks++;
5880 dev->nFreeChunks += dev->nChunksPerBlock;
5881 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5882
5883 /* Determine the highest sequence number */
5884 if (dev->isYaffs2 &&
5885 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5886 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5887
5888 blockIndex[nBlocksToScan].seq = sequenceNumber;
5889 blockIndex[nBlocksToScan].block = blk;
5890
5891 nBlocksToScan++;
5892
5893 if (sequenceNumber >= dev->sequenceNumber) {
5894 dev->sequenceNumber = sequenceNumber;
5895 }
5896 } else if (dev->isYaffs2) {
5897 /* TODO: Nasty sequence number! */
5898 T(YAFFS_TRACE_SCAN,
5899 (TSTR
5900 ("Block scanning block %d has bad sequence number %d"
5901 TENDSTR), blk, sequenceNumber));
5902
5903 }
5904 }
5905 }
5906
5907 T(YAFFS_TRACE_SCAN,
5908 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
5909
5910
5911
5912 YYIELD();
5913
5914 /* Sort the blocks */
5915#ifndef CONFIG_YAFFS_USE_OWN_SORT
5916 {
5917 /* Use qsort now. */
5918 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
5919 }
5920#else
5921 {
4b070809
WD		 5922 /* Dungy old bubble sort... */
5923
0e8cc8bd
WJ		 5924 yaffs_BlockIndex temp;
5925 int i;
5926 int j;
5927
5928 for (i = 0; i < nBlocksToScan; i++)
5929 for (j = i + 1; j < nBlocksToScan; j++)
5930 if (blockIndex[i].seq > blockIndex[j].seq) {
5931 temp = blockIndex[j];
5932 blockIndex[j] = blockIndex[i];
5933 blockIndex[i] = temp;
5934 }
5935 }
5936#endif
5937
5938 YYIELD();
5939
4b070809 5940 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
0e8cc8bd
WJ		 5941
5942 /* Now scan the blocks looking at the data. */
5943 startIterator = 0;
5944 endIterator = nBlocksToScan - 1;
5945 T(YAFFS_TRACE_SCAN_DEBUG,
5946 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5947
5948 /* For each block.... backwards */
5949 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
5950 blockIterator--) {
4b070809 5951 /* Cooperative multitasking! This loop can run for so
0e8cc8bd 5952 long that watchdog timers expire. */
4b070809 5953 YYIELD();
0e8cc8bd
WJ		 5954
5955 /* get the block to scan in the correct order */
5956 blk = blockIndex[blockIterator].block;
5957
5958 bi = yaffs_GetBlockInfo(dev, blk);
4b070809
WD		 5959
5960
0e8cc8bd
WJ		 5961 state = bi->blockState;
5962
0e8cc8bd
WJ		 5963 /* For each chunk in each block that needs scanning.... */
5964 foundChunksInBlock = 0;
4b070809 5965 for (c = dev->nChunksPerBlock - 1;
0e8cc8bd
WJ		 5966 !alloc_failed && c >= 0 &&
5967 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
5968 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
4b070809 5969 /* Scan backwards...
0e8cc8bd
WJ		 5970 * Read the tags and decide what to do
5971 */
4b070809 5972
0e8cc8bd
WJ		 5973 chunk = blk * dev->nChunksPerBlock + c;
5974
360ab450 5975 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
0e8cc8bd
WJ		 5976 &tags);
5977
5978 /* Let's have a good look at this chunk... */
5979
5980 if (!tags.chunkUsed) {
5981 /* An unassigned chunk in the block.
5982 * If there are used chunks after this one, then
5983 * it is a chunk that was skipped due to failing the erased
5984 * check. Just skip it so that it can be deleted.
5985 * But, more typically, We get here when this is an unallocated
4b070809 5986 * chunk and his means that either the block is empty or
0e8cc8bd
WJ		 5987 * this is the one being allocated from
5988 */
5989
5990 if(foundChunksInBlock)
5991 {
5992 /* This is a chunk that was skipped due to failing the erased check */
4b070809 5993
0e8cc8bd
WJ		 5994 } else if (c == 0) {
5995 /* We're looking at the first chunk in the block so the block is unused */
5996 state = YAFFS_BLOCK_STATE_EMPTY;
5997 dev->nErasedBlocks++;
5998 } else {
5999 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6000 state == YAFFS_BLOCK_STATE_ALLOCATING) {
4b070809 6001 if(dev->sequenceNumber == bi->sequenceNumber) {
0e8cc8bd 6002 /* this is the block being allocated from */
4b070809 6003
0e8cc8bd
WJ		 6004 T(YAFFS_TRACE_SCAN,
6005 (TSTR
6006 (" Allocating from %d %d"
6007 TENDSTR), blk, c));
6008
6009 state = YAFFS_BLOCK_STATE_ALLOCATING;
6010 dev->allocationBlock = blk;
6011 dev->allocationPage = c;
4b070809 6012 dev->allocationBlockFinder = blk;
0e8cc8bd
WJ		 6013 }
6014 else {
6015 /* This is a partially written block that is not
6016 * the current allocation block. This block must have
6017 * had a write failure, so set up for retirement.
6018 */
4b070809 6019
0e8cc8bd
WJ		 6020 bi->needsRetiring = 1;
6021 bi->gcPrioritise = 1;
4b070809 6022
0e8cc8bd
WJ		 6023 T(YAFFS_TRACE_ALWAYS,
6024 (TSTR("Partially written block %d being set for retirement" TENDSTR),
6025 blk));
6026 }
6027
6028 }
4b070809 6029
0e8cc8bd
WJ		 6030 }
6031
6032 dev->nFreeChunks++;
4b070809 6033
0e8cc8bd
WJ		 6034 } else if (tags.chunkId > 0) {
6035 /* chunkId > 0 so it is a data chunk... */
6036 unsigned int endpos;
6037 __u32 chunkBase =
6038 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
4b070809 6039
0e8cc8bd
WJ		 6040 foundChunksInBlock = 1;
6041
6042
6043 yaffs_SetChunkBit(dev, blk, c);
6044 bi->pagesInUse++;
6045
6046 in = yaffs_FindOrCreateObjectByNumber(dev,
6047 tags.
6048 objectId,
6049 YAFFS_OBJECT_TYPE_FILE);
6050 if(!in){
6051 /* Out of memory */
6052 alloc_failed = 1;
6053 }
4b070809 6054
0e8cc8bd
WJ		 6055 if (in &&
6056 in->variantType == YAFFS_OBJECT_TYPE_FILE
6057 && chunkBase <
6058 in->variant.fileVariant.shrinkSize) {
6059 /* This has not been invalidated by a resize */
6060 if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
6061 chunk, -1)){
6062 alloc_failed = 1;
6063 }
6064
4b070809 6065 /* File size is calculated by looking at the data chunks if we have not
0e8cc8bd
WJ		 6066 * seen an object header yet. Stop this practice once we find an object header.
6067 */
6068 endpos =
6069 (tags.chunkId -
6070 1) * dev->nDataBytesPerChunk +
6071 tags.byteCount;
4b070809 6072
0e8cc8bd
WJ		 6073 if (!in->valid && /* have not got an object header yet */
6074 in->variant.fileVariant.
6075 scannedFileSize < endpos) {
6076 in->variant.fileVariant.
6077 scannedFileSize = endpos;
6078 in->variant.fileVariant.
6079 fileSize =
6080 in->variant.fileVariant.
6081 scannedFileSize;
6082 }
6083
6084 } else if(in) {
6085 /* This chunk has been invalidated by a resize, so delete */
6086 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6087
6088 }
6089 } else {
6090 /* chunkId == 0, so it is an ObjectHeader.
6091 * Thus, we read in the object header and make the object
6092 */
6093 foundChunksInBlock = 1;
6094
6095 yaffs_SetChunkBit(dev, blk, c);
6096 bi->pagesInUse++;
6097
6098 oh = NULL;
6099 in = NULL;
6100
6101 if (tags.extraHeaderInfoAvailable) {
6102 in = yaffs_FindOrCreateObjectByNumber
6103 (dev, tags.objectId,
6104 tags.extraObjectType);
6105 }
6106
6107 if (!in ||
6108#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6109 !in->valid ||
6110#endif
6111 tags.extraShadows ||
6112 (!in->valid &&
6113 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6114 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
6115 ) {
6116
6117 /* If we don't have valid info then we need to read the chunk
4b070809 6118 * TODO In future we can probably defer reading the chunk and
0e8cc8bd
WJ		 6119 * living with invalid data until needed.
6120 */
6121
360ab450 6122 yaffs_ReadChunkWithTagsFromNAND(dev,
0e8cc8bd
WJ		 6123 chunk,
6124 chunkData,
6125 NULL);
6126
6127 oh = (yaffs_ObjectHeader *) chunkData;
6128
6129 if (!in)
6130 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6131
6132 }
6133
6134 if (!in) {
6135 /* TODO Hoosterman we have a problem! */
6136 T(YAFFS_TRACE_ERROR,
6137 (TSTR
6138 ("yaffs tragedy: Could not make object for object %d "
6139 "at chunk %d during scan"
6140 TENDSTR), tags.objectId, chunk));
6141
6142 }
6143
6144 if (in->valid) {
6145 /* We have already filled this one.
4b070809 6146 * We have a duplicate that will be discarded, but
0e8cc8bd
WJ		 6147 * we first have to suck out resize info if it is a file.
6148 */
6149
4b070809
WD		 6150 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6151 ((oh &&
0e8cc8bd
WJ		 6152 oh-> type == YAFFS_OBJECT_TYPE_FILE)||
6153 (tags.extraHeaderInfoAvailable &&
6154 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
6155 ) {
6156 __u32 thisSize =
6157 (oh) ? oh->fileSize : tags.
6158 extraFileLength;
6159 __u32 parentObjectId =
6160 (oh) ? oh->
6161 parentObjectId : tags.
6162 extraParentObjectId;
6163 unsigned isShrink =
6164 (oh) ? oh->isShrink : tags.
6165 extraIsShrinkHeader;
6166
6167 /* If it is deleted (unlinked at start also means deleted)
6168 * we treat the file size as being zeroed at this point.
6169 */
6170 if (parentObjectId ==
6171 YAFFS_OBJECTID_DELETED
6172 || parentObjectId ==
6173 YAFFS_OBJECTID_UNLINKED) {
6174 thisSize = 0;
6175 isShrink = 1;
6176 }
6177
6178 if (isShrink &&
6179 in->variant.fileVariant.
6180 shrinkSize > thisSize) {
6181 in->variant.fileVariant.
6182 shrinkSize =
6183 thisSize;
6184 }
6185
6186 if (isShrink) {
6187 bi->hasShrinkHeader = 1;
6188 }
6189
6190 }
6191 /* Use existing - destroy this one. */
6192 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6193
6194 }
6195
6196 if (!in->valid &&
6197 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6198 tags.objectId ==
6199 YAFFS_OBJECTID_LOSTNFOUND)) {
6200 /* We only load some info, don't fiddle with directory structure */
6201 in->valid = 1;
4b070809 6202
0e8cc8bd
WJ		 6203 if(oh) {
6204 in->variantType = oh->type;
6205
6206 in->yst_mode = oh->yst_mode;
6207#ifdef CONFIG_YAFFS_WINCE
6208 in->win_atime[0] = oh->win_atime[0];
6209 in->win_ctime[0] = oh->win_ctime[0];
6210 in->win_mtime[0] = oh->win_mtime[0];
6211 in->win_atime[1] = oh->win_atime[1];
6212 in->win_ctime[1] = oh->win_ctime[1];
6213 in->win_mtime[1] = oh->win_mtime[1];
6214#else
6215 in->yst_uid = oh->yst_uid;
6216 in->yst_gid = oh->yst_gid;
6217 in->yst_atime = oh->yst_atime;
6218 in->yst_mtime = oh->yst_mtime;
6219 in->yst_ctime = oh->yst_ctime;
6220 in->yst_rdev = oh->yst_rdev;
4b070809 6221
0e8cc8bd
WJ		 6222#endif
6223 } else {
6224 in->variantType = tags.extraObjectType;
6225 in->lazyLoaded = 1;
6226 }
4b070809 6227
0e8cc8bd
WJ		 6228 in->chunkId = chunk;
6229
6230 } else if (!in->valid) {
6231 /* we need to load this info */
6232
6233 in->valid = 1;
6234 in->chunkId = chunk;
4b070809 6235
0e8cc8bd
WJ		 6236 if(oh) {
6237 in->variantType = oh->type;
6238
6239 in->yst_mode = oh->yst_mode;
6240#ifdef CONFIG_YAFFS_WINCE
6241 in->win_atime[0] = oh->win_atime[0];
6242 in->win_ctime[0] = oh->win_ctime[0];
6243 in->win_mtime[0] = oh->win_mtime[0];
6244 in->win_atime[1] = oh->win_atime[1];
6245 in->win_ctime[1] = oh->win_ctime[1];
6246 in->win_mtime[1] = oh->win_mtime[1];
6247#else
6248 in->yst_uid = oh->yst_uid;
6249 in->yst_gid = oh->yst_gid;
6250 in->yst_atime = oh->yst_atime;
6251 in->yst_mtime = oh->yst_mtime;
6252 in->yst_ctime = oh->yst_ctime;
6253 in->yst_rdev = oh->yst_rdev;
6254#endif
6255
4b070809 6256 if (oh->shadowsObject > 0)
0e8cc8bd
WJ		 6257 yaffs_HandleShadowedObject(dev,
6258 oh->
6259 shadowsObject,
6260 1);
4b070809 6261
0e8cc8bd
WJ		 6262
6263 yaffs_SetObjectName(in, oh->name);
6264 parent =
6265 yaffs_FindOrCreateObjectByNumber
4b070809
WD		 6266 (dev, oh->parentObjectId,
6267 YAFFS_OBJECT_TYPE_DIRECTORY);
0e8cc8bd
WJ		 6268
6269 fileSize = oh->fileSize;
4b070809 6270 isShrink = oh->isShrink;
0e8cc8bd
WJ		 6271 equivalentObjectId = oh->equivalentObjectId;
6272
6273 }
6274 else {
6275 in->variantType = tags.extraObjectType;
6276 parent =
6277 yaffs_FindOrCreateObjectByNumber
4b070809
WD		 6278 (dev, tags.extraParentObjectId,
6279 YAFFS_OBJECT_TYPE_DIRECTORY);
0e8cc8bd
WJ		 6280 fileSize = tags.extraFileLength;
6281 isShrink = tags.extraIsShrinkHeader;
6282 equivalentObjectId = tags.extraEquivalentObjectId;
6283 in->lazyLoaded = 1;
6284
6285 }
6286 in->dirty = 0;
6287
6288 /* directory stuff...
6289 * hook up to parent
6290 */
6291
6292 if (parent->variantType ==
6293 YAFFS_OBJECT_TYPE_UNKNOWN) {
6294 /* Set up as a directory */
6295 parent->variantType =
6296 YAFFS_OBJECT_TYPE_DIRECTORY;
6297 INIT_LIST_HEAD(&parent->variant.
6298 directoryVariant.
6299 children);
6300 } else if (parent->variantType !=
6301 YAFFS_OBJECT_TYPE_DIRECTORY)
6302 {
6303 /* Hoosterman, another problem....
6304 * We're trying to use a non-directory as a directory
6305 */
6306
6307 T(YAFFS_TRACE_ERROR,
6308 (TSTR
6309 ("yaffs tragedy: attempting to use non-directory as"
6310 " a directory in scan. Put in lost+found."
6311 TENDSTR)));
6312 parent = dev->lostNFoundDir;
6313 }
6314
6315 yaffs_AddObjectToDirectory(parent, in);
6316
6317 itsUnlinked = (parent == dev->deletedDir) ||
6318 (parent == dev->unlinkedDir);
6319
6320 if (isShrink) {
6321 /* Mark the block as having a shrinkHeader */
6322 bi->hasShrinkHeader = 1;
6323 }
6324
6325 /* Note re hardlinks.
6326 * Since we might scan a hardlink before its equivalent object is scanned
6327 * we put them all in a list.
6328 * After scanning is complete, we should have all the objects, so we run
4b070809 6329 * through this list and fix up all the chains.
0e8cc8bd
WJ		 6330 */
6331
6332 switch (in->variantType) {
4b070809 6333 case YAFFS_OBJECT_TYPE_UNKNOWN:
0e8cc8bd
WJ		 6334 /* Todo got a problem */
6335 break;
6336 case YAFFS_OBJECT_TYPE_FILE:
6337
6338 if (in->variant.fileVariant.
6339 scannedFileSize < fileSize) {
6340 /* This covers the case where the file size is greater
6341 * than where the data is
4b070809 6342 * This will happen if the file is resized to be larger
0e8cc8bd
WJ		 6343 * than its current data extents.
6344 */
6345 in->variant.fileVariant.fileSize = fileSize;
6346 in->variant.fileVariant.scannedFileSize =
6347 in->variant.fileVariant.fileSize;
6348 }
6349
6350 if (isShrink &&
6351 in->variant.fileVariant.shrinkSize > fileSize) {
6352 in->variant.fileVariant.shrinkSize = fileSize;
6353 }
6354
6355 break;
6356 case YAFFS_OBJECT_TYPE_HARDLINK:
6357 if(!itsUnlinked) {
6358 in->variant.hardLinkVariant.equivalentObjectId =
6359 equivalentObjectId;
6360 in->hardLinks.next =
6361 (struct list_head *) hardList;
6362 hardList = in;
6363 }
6364 break;
6365 case YAFFS_OBJECT_TYPE_DIRECTORY:
6366 /* Do nothing */
6367 break;
6368 case YAFFS_OBJECT_TYPE_SPECIAL:
6369 /* Do nothing */
6370 break;
6371 case YAFFS_OBJECT_TYPE_SYMLINK:
6372 if(oh){
6373 in->variant.symLinkVariant.alias =
6374 yaffs_CloneString(oh->
6375 alias);
6376 if(!in->variant.symLinkVariant.alias)
4b070809 6377 alloc_failed = 1;
0e8cc8bd
WJ		 6378 }
6379 break;
6380 }
6381
6382 }
4b070809 6383
0e8cc8bd
WJ		 6384 }
6385
6386 } /* End of scanning for each chunk */
6387
6388 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6389 /* If we got this far while scanning, then the block is fully allocated. */
6390 state = YAFFS_BLOCK_STATE_FULL;
6391 }
6392
6393 bi->blockState = state;
6394
6395 /* Now let's see if it was dirty */
6396 if (bi->pagesInUse == 0 &&
6397 !bi->hasShrinkHeader &&
6398 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6399 yaffs_BlockBecameDirty(dev, blk);
6400 }
6401
6402 }
6403
4b070809 6404 if (altBlockIndex)
0e8cc8bd
WJ		 6405 YFREE_ALT(blockIndex);
6406 else
6407 YFREE(blockIndex);
4b070809 6408
0e8cc8bd
WJ		 6409 /* Ok, we've done all the scanning.
6410 * Fix up the hard link chains.
4b070809 6411 * We should now have scanned all the objects, now it's time to add these
0e8cc8bd
WJ		 6412 * hardlinks.
6413 */
6414 yaffs_HardlinkFixup(dev,hardList);
4b070809
WD		 6415
6416
0e8cc8bd
WJ		 6417 /*
6418 * Sort out state of unlinked and deleted objects.
6419 */
6420 {
6421 struct list_head *i;
6422 struct list_head *n;
6423
6424 yaffs_Object *l;
6425
6426 /* Soft delete all the unlinked files */
6427 list_for_each_safe(i, n,
6428 &dev->unlinkedDir->variant.directoryVariant.
6429 children) {
6430 if (i) {
6431 l = list_entry(i, yaffs_Object, siblings);
6432 yaffs_DestroyObject(l);
6433 }
6434 }
6435
6436 /* Soft delete all the deletedDir files */
6437 list_for_each_safe(i, n,
6438 &dev->deletedDir->variant.directoryVariant.
6439 children) {
6440 if (i) {
6441 l = list_entry(i, yaffs_Object, siblings);
6442 yaffs_DestroyObject(l);
6443
6444 }
6445 }
6446 }
6447
6448 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4b070809 6449
0e8cc8bd
WJ		 6450 if(alloc_failed){
6451 return YAFFS_FAIL;
6452 }
6453
6454 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6455
6456 return YAFFS_OK;
6457}
6458
6459/*------------------------------ Directory Functions ----------------------------- */
6460
6461static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
6462{
6463 yaffs_Device *dev = obj->myDev;
4b070809 6464
0e8cc8bd
WJ		 6465 if(dev && dev->removeObjectCallback)
6466 dev->removeObjectCallback(obj);
4b070809 6467
0e8cc8bd
WJ		 6468 list_del_init(&obj->siblings);
6469 obj->parent = NULL;
6470}
6471
6472
6473static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
6474 yaffs_Object * obj)
6475{
6476
6477 if (!directory) {
6478 T(YAFFS_TRACE_ALWAYS,
6479 (TSTR
6480 ("tragedy: Trying to add an object to a null pointer directory"
6481 TENDSTR)));
6482 YBUG();
6483 }
6484 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6485 T(YAFFS_TRACE_ALWAYS,
6486 (TSTR
6487 ("tragedy: Trying to add an object to a non-directory"
6488 TENDSTR)));
6489 YBUG();
6490 }
6491
6492 if (obj->siblings.prev == NULL) {
6493 /* Not initialised */
6494 INIT_LIST_HEAD(&obj->siblings);
6495
6496 } else if (!list_empty(&obj->siblings)) {
6497 /* If it is holed up somewhere else, un hook it */
6498 yaffs_RemoveObjectFromDirectory(obj);
6499 }
6500 /* Now add it */
6501 list_add(&obj->siblings, &directory->variant.directoryVariant.children);
6502 obj->parent = directory;
6503
6504 if (directory == obj->myDev->unlinkedDir
6505 || directory == obj->myDev->deletedDir) {
6506 obj->unlinked = 1;
6507 obj->myDev->nUnlinkedFiles++;
6508 obj->renameAllowed = 0;
6509 }
6510}
6511
6512yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
6513 const YCHAR * name)
6514{
6515 int sum;
6516
6517 struct list_head *i;
6518 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6519
6520 yaffs_Object *l;
6521
6522 if (!name) {
6523 return NULL;
6524 }
6525
6526 if (!directory) {
6527 T(YAFFS_TRACE_ALWAYS,
6528 (TSTR
6529 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6530 TENDSTR)));
6531 YBUG();
6532 }
6533 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6534 T(YAFFS_TRACE_ALWAYS,
6535 (TSTR
6536 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6537 YBUG();
6538 }
6539
6540 sum = yaffs_CalcNameSum(name);
6541
6542 list_for_each(i, &directory->variant.directoryVariant.children) {
6543 if (i) {
6544 l = list_entry(i, yaffs_Object, siblings);
4b070809 6545
0e8cc8bd
WJ		 6546 yaffs_CheckObjectDetailsLoaded(l);
6547
6548 /* Special case for lost-n-found */
6549 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6550 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
6551 return l;
6552 }
4b070809 6553 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
0e8cc8bd
WJ		 6554 {
6555 /* LostnFound cunk called Objxxx
6556 * Do a real check
6557 */
6558 yaffs_GetObjectName(l, buffer,
6559 YAFFS_MAX_NAME_LENGTH);
6560 if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
6561 return l;
6562 }
6563
6564 }
6565 }
6566 }
6567
6568 return NULL;
6569}
6570
6571
6572#if 0
6573int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
6574 int (*fn) (yaffs_Object *))
6575{
6576 struct list_head *i;
6577 yaffs_Object *l;
6578
6579 if (!theDir) {
6580 T(YAFFS_TRACE_ALWAYS,
6581 (TSTR
6582 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6583 TENDSTR)));
6584 YBUG();
6585 }
6586 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6587 T(YAFFS_TRACE_ALWAYS,
6588 (TSTR
6589 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6590 YBUG();
6591 }
6592
6593 list_for_each(i, &theDir->variant.directoryVariant.children) {
6594 if (i) {
6595 l = list_entry(i, yaffs_Object, siblings);
6596 if (l && !fn(l)) {
6597 return YAFFS_FAIL;
6598 }
6599 }
6600 }
6601
6602 return YAFFS_OK;
6603
6604}
6605#endif
6606
6607/* GetEquivalentObject dereferences any hard links to get to the
6608 * actual object.
6609 */
6610
6611yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
6612{
6613 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6614 /* We want the object id of the equivalent object, not this one */
6615 obj = obj->variant.hardLinkVariant.equivalentObject;
6616 yaffs_CheckObjectDetailsLoaded(obj);
6617 }
6618 return obj;
6619
6620}
6621
6622int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
6623{
6624 memset(name, 0, buffSize * sizeof(YCHAR));
4b070809 6625
0e8cc8bd
WJ		 6626 yaffs_CheckObjectDetailsLoaded(obj);
6627
6628 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6629 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6630 } else if (obj->chunkId <= 0) {
6631 YCHAR locName[20];
6632 /* make up a name */
6633 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
6634 obj->objectId);
6635 yaffs_strncpy(name, locName, buffSize - 1);
6636
6637 }
6638#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6639 else if (obj->shortName[0]) {
6640 yaffs_strcpy(name, obj->shortName);
6641 }
6642#endif
6643 else {
0e8cc8bd
WJ		 6644 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6645
6646 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6647
6648 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6649
6650 if (obj->chunkId >= 0) {
360ab450 6651 yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
0e8cc8bd
WJ		 6652 obj->chunkId, buffer,
6653 NULL);
6654 }
6655 yaffs_strncpy(name, oh->name, buffSize - 1);
6656
6657 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6658 }
6659
6660 return yaffs_strlen(name);
6661}
6662
6663int yaffs_GetObjectFileLength(yaffs_Object * obj)
6664{
6665
6666 /* Dereference any hard linking */
6667 obj = yaffs_GetEquivalentObject(obj);
6668
6669 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
6670 return obj->variant.fileVariant.fileSize;
6671 }
6672 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6673 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6674 } else {
6675 /* Only a directory should drop through to here */
6676 return obj->myDev->nDataBytesPerChunk;
6677 }
6678}
6679
6680int yaffs_GetObjectLinkCount(yaffs_Object * obj)
6681{
6682 int count = 0;
6683 struct list_head *i;
6684
6685 if (!obj->unlinked) {
6686 count++; /* the object itself */
6687 }
6688 list_for_each(i, &obj->hardLinks) {
6689 count++; /* add the hard links; */
6690 }
6691 return count;
6692
6693}
6694
6695int yaffs_GetObjectInode(yaffs_Object * obj)
6696{
6697 obj = yaffs_GetEquivalentObject(obj);
6698
6699 return obj->objectId;
6700}
6701
6702unsigned yaffs_GetObjectType(yaffs_Object * obj)
6703{
6704 obj = yaffs_GetEquivalentObject(obj);
6705
6706 switch (obj->variantType) {
6707 case YAFFS_OBJECT_TYPE_FILE:
6708 return DT_REG;
6709 break;
6710 case YAFFS_OBJECT_TYPE_DIRECTORY:
6711 return DT_DIR;
6712 break;
6713 case YAFFS_OBJECT_TYPE_SYMLINK:
6714 return DT_LNK;
6715 break;
6716 case YAFFS_OBJECT_TYPE_HARDLINK:
6717 return DT_REG;
6718 break;
6719 case YAFFS_OBJECT_TYPE_SPECIAL:
6720 if (S_ISFIFO(obj->yst_mode))
6721 return DT_FIFO;
6722 if (S_ISCHR(obj->yst_mode))
6723 return DT_CHR;
6724 if (S_ISBLK(obj->yst_mode))
6725 return DT_BLK;
6726 if (S_ISSOCK(obj->yst_mode))
6727 return DT_SOCK;
6728 default:
6729 return DT_REG;
6730 break;
6731 }
6732}
6733
6734YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
6735{
6736 obj = yaffs_GetEquivalentObject(obj);
6737 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6738 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
6739 } else {
6740 return yaffs_CloneString(_Y(""));
6741 }
6742}
6743
6744#ifndef CONFIG_YAFFS_WINCE
6745
6746int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
6747{
6748 unsigned int valid = attr->ia_valid;
6749
6750 if (valid & ATTR_MODE)
6751 obj->yst_mode = attr->ia_mode;
6752 if (valid & ATTR_UID)
6753 obj->yst_uid = attr->ia_uid;
6754 if (valid & ATTR_GID)
6755 obj->yst_gid = attr->ia_gid;
6756
6757 if (valid & ATTR_ATIME)
6758 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
6759 if (valid & ATTR_CTIME)
6760 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
6761 if (valid & ATTR_MTIME)
6762 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
6763
6764 if (valid & ATTR_SIZE)
6765 yaffs_ResizeFile(obj, attr->ia_size);
6766
6767 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6768
6769 return YAFFS_OK;
6770
6771}
6772int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
6773{
6774 unsigned int valid = 0;
6775
6776 attr->ia_mode = obj->yst_mode;
6777 valid |= ATTR_MODE;
6778 attr->ia_uid = obj->yst_uid;
6779 valid |= ATTR_UID;
6780 attr->ia_gid = obj->yst_gid;
6781 valid |= ATTR_GID;
6782
6783 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
6784 valid |= ATTR_ATIME;
6785 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
6786 valid |= ATTR_CTIME;
6787 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
6788 valid |= ATTR_MTIME;
6789
6790 attr->ia_size = yaffs_GetFileSize(obj);
6791 valid |= ATTR_SIZE;
6792
6793 attr->ia_valid = valid;
6794
6795 return YAFFS_OK;
6796
6797}
6798
6799#endif
6800
6801#if 0
6802int yaffs_DumpObject(yaffs_Object * obj)
6803{
6804 YCHAR name[257];
6805
6806 yaffs_GetObjectName(obj, name, 256);
6807
6808 T(YAFFS_TRACE_ALWAYS,
6809 (TSTR
6810 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
6811 " chunk %d type %d size %d\n"
6812 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
6813 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
6814 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
6815
6816 return YAFFS_OK;
6817}
6818#endif
6819
6820/*---------------------------- Initialisation code -------------------------------------- */
6821
6822static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
6823{
6824
6825 /* Common functions, gotta have */
6826 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
6827 return 0;
6828
6829#ifdef CONFIG_YAFFS_YAFFS2
6830
6831 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
6832 if (dev->writeChunkWithTagsToNAND &&
6833 dev->readChunkWithTagsFromNAND &&
6834 !dev->writeChunkToNAND &&
6835 !dev->readChunkFromNAND &&
6836 dev->markNANDBlockBad && dev->queryNANDBlock)
6837 return 1;
6838#endif
6839
6840 /* Can use the "spare" style interface for yaffs1 */
6841 if (!dev->isYaffs2 &&
6842 !dev->writeChunkWithTagsToNAND &&
6843 !dev->readChunkWithTagsFromNAND &&
6844 dev->writeChunkToNAND &&
6845 dev->readChunkFromNAND &&
6846 !dev->markNANDBlockBad && !dev->queryNANDBlock)
6847 return 1;
6848
6849 return 0; /* bad */
6850}
6851
6852
6853static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
6854{
6855 /* Initialise the unlinked, deleted, root and lost and found directories */
4b070809 6856
0e8cc8bd
WJ		 6857 dev->lostNFoundDir = dev->rootDir = NULL;
6858 dev->unlinkedDir = dev->deletedDir = NULL;
6859
6860 dev->unlinkedDir =
6861 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4b070809 6862
0e8cc8bd
WJ		 6863 dev->deletedDir =
6864 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
6865
6866 dev->rootDir =
6867 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
6868 YAFFS_ROOT_MODE | S_IFDIR);
6869 dev->lostNFoundDir =
6870 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
6871 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
4b070809 6872
0e8cc8bd
WJ		 6873 if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
6874 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
6875 return YAFFS_OK;
6876 }
4b070809 6877
0e8cc8bd
WJ		 6878 return YAFFS_FAIL;
6879}
6880
6881int yaffs_GutsInitialise(yaffs_Device * dev)
6882{
6883 int init_failed = 0;
6884 unsigned x;
6885 int bits;
6886
6887 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
6888
6889 /* Check stuff that must be set */
6890
6891 if (!dev) {
6892 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
6893 return YAFFS_FAIL;
6894 }
6895
6896 dev->internalStartBlock = dev->startBlock;
6897 dev->internalEndBlock = dev->endBlock;
6898 dev->blockOffset = 0;
6899 dev->chunkOffset = 0;
6900 dev->nFreeChunks = 0;
6901
6902 if (dev->startBlock == 0) {
6903 dev->internalStartBlock = dev->startBlock + 1;
6904 dev->internalEndBlock = dev->endBlock + 1;
6905 dev->blockOffset = 1;
6906 dev->chunkOffset = dev->nChunksPerBlock;
6907 }
6908
6909 /* Check geometry parameters. */
6910
4b070809
WD		 6911 if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
6912 (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
6913 dev->nChunksPerBlock < 2 ||
6914 dev->nReservedBlocks < 2 ||
6915 dev->internalStartBlock <= 0 ||
6916 dev->internalEndBlock <= 0 ||
0e8cc8bd
WJ		 6917 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
6918 ) {
6919 T(YAFFS_TRACE_ALWAYS,
6920 (TSTR
6921 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
6922 TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
6923 return YAFFS_FAIL;
6924 }
6925
6926 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
6927 T(YAFFS_TRACE_ALWAYS,
6928 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
6929 return YAFFS_FAIL;
6930 }
6931
6932 /* Got the right mix of functions? */
6933 if (!yaffs_CheckDevFunctions(dev)) {
6934 /* Function missing */
6935 T(YAFFS_TRACE_ALWAYS,
6936 (TSTR
6937 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
6938
6939 return YAFFS_FAIL;
6940 }
6941
6942 /* This is really a compilation check. */
6943 if (!yaffs_CheckStructures()) {
6944 T(YAFFS_TRACE_ALWAYS,
6945 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
6946 return YAFFS_FAIL;
6947 }
6948
6949 if (dev->isMounted) {
6950 T(YAFFS_TRACE_ALWAYS,
6951 (TSTR("yaffs: device already mounted\n" TENDSTR)));
6952 return YAFFS_FAIL;
6953 }
6954
6955 /* Finished with most checks. One or two more checks happen later on too. */
6956
6957 dev->isMounted = 1;
6958
6959
6960
6961 /* OK now calculate a few things for the device */
4b070809 6962
0e8cc8bd 6963 /*
4b070809 6964 * Calculate all the chunk size manipulation numbers:
0e8cc8bd
WJ		 6965 */
6966 /* Start off assuming it is a power of 2 */
6967 dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
6968 dev->chunkMask = (1<<dev->chunkShift) - 1;
6969
6970 if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
4b070809 6971 /* Yes it is a power of 2, disable crumbs */
0e8cc8bd
WJ		 6972 dev->crumbMask = 0;
6973 dev->crumbShift = 0;
6974 dev->crumbsPerChunk = 0;
6975 } else {
4b070809 6976 /* Not a power of 2, use crumbs instead */
0e8cc8bd
WJ		 6977 dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
6978 dev->crumbMask = (1<<dev->crumbShift)-1;
6979 dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
6980 dev->chunkShift = 0;
6981 dev->chunkMask = 0;
6982 }
4b070809 6983
0e8cc8bd
WJ		 6984
6985 /*
6986 * Calculate chunkGroupBits.
6987 * We need to find the next power of 2 > than internalEndBlock
6988 */
6989
6990 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
4b070809 6991
0e8cc8bd 6992 bits = ShiftsGE(x);
4b070809 6993
0e8cc8bd
WJ		 6994 /* Set up tnode width if wide tnodes are enabled. */
6995 if(!dev->wideTnodesDisabled){
6996 /* bits must be even so that we end up with 32-bit words */
6997 if(bits & 1)
6998 bits++;
6999 if(bits < 16)
7000 dev->tnodeWidth = 16;
7001 else
7002 dev->tnodeWidth = bits;
7003 }
7004 else
7005 dev->tnodeWidth = 16;
4b070809 7006
0e8cc8bd 7007 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
4b070809 7008
0e8cc8bd
WJ		 7009 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7010 * so if the bitwidth of the
7011 * chunk range we're using is greater than 16 we need
7012 * to figure out chunk shift and chunkGroupSize
7013 */
4b070809 7014
0e8cc8bd
WJ		 7015 if (bits <= dev->tnodeWidth)
7016 dev->chunkGroupBits = 0;
7017 else
7018 dev->chunkGroupBits = bits - dev->tnodeWidth;
4b070809 7019
0e8cc8bd
WJ		 7020
7021 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7022
7023 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7024 /* We have a problem because the soft delete won't work if
7025 * the chunk group size > chunks per block.
7026 * This can be remedied by using larger "virtual blocks".
7027 */
7028 T(YAFFS_TRACE_ALWAYS,
7029 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7030
7031 return YAFFS_FAIL;
7032 }
7033
7034 /* OK, we've finished verifying the device, lets continue with initialisation */
7035
7036 /* More device initialisation */
7037 dev->garbageCollections = 0;
7038 dev->passiveGarbageCollections = 0;
7039 dev->currentDirtyChecker = 0;
7040 dev->bufferedBlock = -1;
7041 dev->doingBufferedBlockRewrite = 0;
7042 dev->nDeletedFiles = 0;
7043 dev->nBackgroundDeletions = 0;
7044 dev->nUnlinkedFiles = 0;
7045 dev->eccFixed = 0;
7046 dev->eccUnfixed = 0;
7047 dev->tagsEccFixed = 0;
7048 dev->tagsEccUnfixed = 0;
7049 dev->nErasureFailures = 0;
7050 dev->nErasedBlocks = 0;
7051 dev->isDoingGC = 0;
7052 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7053
7054 /* Initialise temporary buffers and caches. */
7055 if(!yaffs_InitialiseTempBuffers(dev))
7056 init_failed = 1;
4b070809 7057
0e8cc8bd
WJ		 7058 dev->srCache = NULL;
7059 dev->gcCleanupList = NULL;
4b070809
WD		 7060
7061
0e8cc8bd
WJ		 7062 if (!init_failed &&
7063 dev->nShortOpCaches > 0) {
7064 int i;
7065 __u8 *buf;
7066 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7067
7068 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
7069 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7070 }
7071
068d6f9a
WD		 7072 dev->srCache = YMALLOC(srCacheBytes);
7073 buf = (__u8 *)dev->srCache;
4b070809 7074
0e8cc8bd
WJ		 7075 if(dev->srCache)
7076 memset(dev->srCache,0,srCacheBytes);
4b070809 7077
0e8cc8bd
WJ		 7078 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7079 dev->srCache[i].object = NULL;
7080 dev->srCache[i].lastUse = 0;
7081 dev->srCache[i].dirty = 0;
7082 dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
7083 }
7084 if(!buf)
7085 init_failed = 1;
4b070809 7086
0e8cc8bd
WJ		 7087 dev->srLastUse = 0;
7088 }
7089
7090 dev->cacheHits = 0;
4b070809 7091
0e8cc8bd
WJ		 7092 if(!init_failed){
7093 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7094 if(!dev->gcCleanupList)
7095 init_failed = 1;
7096 }
7097
7098 if (dev->isYaffs2) {
7099 dev->useHeaderFileSize = 1;
7100 }
7101 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7102 init_failed = 1;
4b070809 7103
0e8cc8bd
WJ		 7104 yaffs_InitialiseTnodes(dev);
7105 yaffs_InitialiseObjects(dev);
7106
7107 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7108 init_failed = 1;
7109
7110
7111 if(!init_failed){
7112 /* Now scan the flash. */
7113 if (dev->isYaffs2) {
7114 if(yaffs_CheckpointRestore(dev)) {
7115 T(YAFFS_TRACE_ALWAYS,
7116 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7117 } else {
7118
4b070809
WD		 7119 /* Clean up the mess caused by an aborted checkpoint load
7120 * and scan backwards.
0e8cc8bd
WJ		 7121 */
7122 yaffs_DeinitialiseBlocks(dev);
7123 yaffs_DeinitialiseTnodes(dev);
7124 yaffs_DeinitialiseObjects(dev);
4b070809
WD		 7125
7126
0e8cc8bd
WJ		 7127 dev->nErasedBlocks = 0;
7128 dev->nFreeChunks = 0;
7129 dev->allocationBlock = -1;
7130 dev->allocationPage = -1;
7131 dev->nDeletedFiles = 0;
7132 dev->nUnlinkedFiles = 0;
7133 dev->nBackgroundDeletions = 0;
7134 dev->oldestDirtySequence = 0;
7135
7136 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7137 init_failed = 1;
4b070809 7138
0e8cc8bd
WJ		 7139 yaffs_InitialiseTnodes(dev);
7140 yaffs_InitialiseObjects(dev);
7141
7142 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7143 init_failed = 1;
7144
7145 if(!init_failed && !yaffs_ScanBackwards(dev))
7146 init_failed = 1;
7147 }
7148 }else
7149 if(!yaffs_Scan(dev))
7150 init_failed = 1;
7151 }
4b070809 7152
0e8cc8bd
WJ		 7153 if(init_failed){
7154 /* Clean up the mess */
7155 T(YAFFS_TRACE_TRACING,
7156 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7157
7158 yaffs_Deinitialise(dev);
7159 return YAFFS_FAIL;
7160 }
7161
7162 /* Zero out stats */
7163 dev->nPageReads = 0;
7164 dev->nPageWrites = 0;
7165 dev->nBlockErasures = 0;
7166 dev->nGCCopies = 0;
7167 dev->nRetriedWrites = 0;
7168
7169 dev->nRetiredBlocks = 0;
7170
7171 yaffs_VerifyFreeChunks(dev);
7172 yaffs_VerifyBlocks(dev);
4b070809 7173
0e8cc8bd
WJ		 7174
7175 T(YAFFS_TRACE_TRACING,
7176 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7177 return YAFFS_OK;
7178
7179}
7180
7181void yaffs_Deinitialise(yaffs_Device * dev)
7182{
7183 if (dev->isMounted) {
7184 int i;
7185
7186 yaffs_DeinitialiseBlocks(dev);
7187 yaffs_DeinitialiseTnodes(dev);
7188 yaffs_DeinitialiseObjects(dev);
7189 if (dev->nShortOpCaches > 0 &&
7190 dev->srCache) {
7191
7192 for (i = 0; i < dev->nShortOpCaches; i++) {
7193 if(dev->srCache[i].data)
7194 YFREE(dev->srCache[i].data);
7195 dev->srCache[i].data = NULL;
7196 }
7197
7198 YFREE(dev->srCache);
7199 dev->srCache = NULL;
7200 }
7201
7202 YFREE(dev->gcCleanupList);
7203
7204 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
7205 YFREE(dev->tempBuffer[i].buffer);
7206 }
7207
7208 dev->isMounted = 0;
7209 }
7210
7211}
7212
7213static int yaffs_CountFreeChunks(yaffs_Device * dev)
7214{
7215 int nFree;
7216 int b;
7217
7218 yaffs_BlockInfo *blk;
7219
7220 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7221 b++) {
7222 blk = yaffs_GetBlockInfo(dev, b);
7223
7224 switch (blk->blockState) {
7225 case YAFFS_BLOCK_STATE_EMPTY:
7226 case YAFFS_BLOCK_STATE_ALLOCATING:
7227 case YAFFS_BLOCK_STATE_COLLECTING:
7228 case YAFFS_BLOCK_STATE_FULL:
7229 nFree +=
7230 (dev->nChunksPerBlock - blk->pagesInUse +
7231 blk->softDeletions);
7232 break;
7233 default:
7234 break;
7235 }
7236
7237 }
7238
7239 return nFree;
7240}
7241
7242int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
7243{
7244 /* This is what we report to the outside world */
7245
7246 int nFree;
7247 int nDirtyCacheChunks;
7248 int blocksForCheckpoint;
7249
7250#if 1
7251 nFree = dev->nFreeChunks;
7252#else
7253 nFree = yaffs_CountFreeChunks(dev);
7254#endif
7255
7256 nFree += dev->nDeletedFiles;
4b070809 7257
0e8cc8bd
WJ		 7258 /* Now count the number of dirty chunks in the cache and subtract those */
7259
7260 {
7261 int i;
7262 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7263 if (dev->srCache[i].dirty)
7264 nDirtyCacheChunks++;
7265 }
7266 }
7267
7268 nFree -= nDirtyCacheChunks;
7269
7270 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
4b070809 7271
0e8cc8bd
WJ		 7272 /* Now we figure out how much to reserve for the checkpoint and report that... */
7273 blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
7274 if(blocksForCheckpoint < 0)
7275 blocksForCheckpoint = 0;
4b070809 7276
0e8cc8bd
WJ		 7277 nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7278
7279 if (nFree < 0)
7280 nFree = 0;
7281
7282 return nFree;
7283
7284}
7285
7286static int yaffs_freeVerificationFailures;
7287
7288static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
7289{
7290 int counted;
7291 int difference;
4b070809 7292
0e8cc8bd
WJ		 7293 if(yaffs_SkipVerification(dev))
7294 return;
4b070809 7295
0e8cc8bd
WJ		 7296 counted = yaffs_CountFreeChunks(dev);
7297
7298 difference = dev->nFreeChunks - counted;
7299
7300 if (difference) {
7301 T(YAFFS_TRACE_ALWAYS,
7302 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7303 dev->nFreeChunks, counted, difference));
7304 yaffs_freeVerificationFailures++;
7305 }
7306}
7307
7308/*---------------------------------------- YAFFS test code ----------------------*/
7309
7310#define yaffs_CheckStruct(structure,syze, name) \
4b070809 7311 if(sizeof(structure) != syze) \
0e8cc8bd 7312 { \
4b070809 7313 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
0e8cc8bd 7314 name,syze,sizeof(structure))); \
4b070809 7315 return YAFFS_FAIL; \
0e8cc8bd
WJ		 7316 }
7317
7318static int yaffs_CheckStructures(void)
7319{
7320/* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
7321/* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
7322/* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
7323#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7324 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
7325#endif
7326 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
7327
7328 return YAFFS_OK;
7329}
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