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arch/arm/cpu/armv7/s5p-common/pwm.c: fix GCC 4.6 warning
[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;
854 int result;
855
856 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
4b070809 857
0e8cc8bd
WJ		 858 if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
859 retval = YAFFS_FAIL;
4b070809 860
0e8cc8bd
WJ		 861
862 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
863 T(YAFFS_TRACE_NANDACCESS,
864 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
865 retval = YAFFS_FAIL;
866 }
867
868 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
869
870 return retval;
871
872}
873
874static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
875 const __u8 * data,
876 yaffs_ExtendedTags * tags,
877 int useReserve)
878{
879 int attempts = 0;
880 int writeOk = 0;
881 int chunk;
882
883 yaffs_InvalidateCheckpoint(dev);
884
885 do {
886 yaffs_BlockInfo *bi = 0;
887 int erasedOk = 0;
888
889 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
890 if (chunk < 0) {
891 /* no space */
892 break;
893 }
894
895 /* First check this chunk is erased, if it needs
896 * checking. The checking policy (unless forced
897 * always on) is as follows:
898 *
899 * Check the first page we try to write in a block.
900 * If the check passes then we don't need to check any
901 * more. If the check fails, we check again...
902 * If the block has been erased, we don't need to check.
903 *
904 * However, if the block has been prioritised for gc,
905 * then we think there might be something odd about
906 * this block and stop using it.
907 *
908 * Rationale: We should only ever see chunks that have
909 * not been erased if there was a partially written
910 * chunk due to power loss. This checking policy should
911 * catch that case with very few checks and thus save a
912 * lot of checks that are most likely not needed.
913 */
914 if (bi->gcPrioritise) {
915 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
916 /* try another chunk */
917 continue;
918 }
919
920 /* let's give it a try */
921 attempts++;
922
923#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
924 bi->skipErasedCheck = 0;
925#endif
926 if (!bi->skipErasedCheck) {
927 erasedOk = yaffs_CheckChunkErased(dev, chunk);
928 if (erasedOk != YAFFS_OK) {
929 T(YAFFS_TRACE_ERROR,
930 (TSTR ("**>> yaffs chunk %d was not erased"
931 TENDSTR), chunk));
932
933 /* try another chunk */
934 continue;
935 }
936 bi->skipErasedCheck = 1;
937 }
938
939 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
940 data, tags);
941 if (writeOk != YAFFS_OK) {
942 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
943 /* try another chunk */
944 continue;
945 }
946
947 /* Copy the data into the robustification buffer */
948 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
949
4b070809
WD		 950 } while (writeOk != YAFFS_OK &&
951 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
952
0e8cc8bd
WJ		 953 if(!writeOk)
954 chunk = -1;
955
956 if (attempts > 1) {
957 T(YAFFS_TRACE_ERROR,
958 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
959 attempts));
960
961 dev->nRetriedWrites += (attempts - 1);
962 }
963
964 return chunk;
965}
966
967/*
968 * Block retiring for handling a broken block.
969 */
4b070809 970
0e8cc8bd
WJ		 971static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
972{
973 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
974
975 yaffs_InvalidateCheckpoint(dev);
4b070809 976
0e8cc8bd
WJ		 977 yaffs_MarkBlockBad(dev, blockInNAND);
978
979 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
980 bi->gcPrioritise = 0;
981 bi->needsRetiring = 0;
982
983 dev->nRetiredBlocks++;
984}
985
986/*
987 * Functions for robustisizing TODO
988 *
989 */
4b070809 990
0e8cc8bd
WJ		 991static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
992 const __u8 * data,
993 const yaffs_ExtendedTags * tags)
994{
995}
996
997static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
998 const yaffs_ExtendedTags * tags)
999{
1000}
1001
1002void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1003{
1004 if(!bi->gcPrioritise){
1005 bi->gcPrioritise = 1;
1006 dev->hasPendingPrioritisedGCs = 1;
1007 bi->chunkErrorStrikes ++;
4b070809 1008
0e8cc8bd
WJ		 1009 if(bi->chunkErrorStrikes > 3){
1010 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1011 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1012
1013 }
4b070809 1014
0e8cc8bd
WJ		 1015 }
1016}
1017
1018static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
1019{
1020
1021 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1022 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1023
1024 yaffs_HandleChunkError(dev,bi);
4b070809
WD		 1025
1026
0e8cc8bd
WJ		 1027 if(erasedOk ) {
1028 /* Was an actual write failure, so mark the block for retirement */
1029 bi->needsRetiring = 1;
1030 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1031 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1032
4b070809 1033
0e8cc8bd 1034 }
4b070809 1035
0e8cc8bd
WJ		 1036 /* Delete the chunk */
1037 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1038}
1039
1040
4b070809 1041/*---------------- Name handling functions ------------*/
0e8cc8bd
WJ		 1042
1043static __u16 yaffs_CalcNameSum(const YCHAR * name)
1044{
1045 __u16 sum = 0;
1046 __u16 i = 1;
1047
1048 YUCHAR *bname = (YUCHAR *) name;
1049 if (bname) {
1050 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1051
1052#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1053 sum += yaffs_toupper(*bname) * i;
1054#else
1055 sum += (*bname) * i;
1056#endif
1057 i++;
1058 bname++;
1059 }
1060 }
1061 return sum;
1062}
1063
1064static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
1065{
1066#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1067 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
1068 yaffs_strcpy(obj->shortName, name);
1069 } else {
1070 obj->shortName[0] = _Y('\0');
1071 }
1072#endif
1073 obj->sum = yaffs_CalcNameSum(name);
1074}
1075
1076/*-------------------- TNODES -------------------
1077
1078 * List of spare tnodes
1079 * The list is hooked together using the first pointer
1080 * in the tnode.
1081 */
4b070809 1082
0e8cc8bd
WJ		 1083/* yaffs_CreateTnodes creates a bunch more tnodes and
1084 * adds them to the tnode free list.
1085 * Don't use this function directly
1086 */
1087
1088static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
1089{
1090 int i;
1091 int tnodeSize;
1092 yaffs_Tnode *newTnodes;
1093 __u8 *mem;
1094 yaffs_Tnode *curr;
1095 yaffs_Tnode *next;
1096 yaffs_TnodeList *tnl;
1097
1098 if (nTnodes < 1)
1099 return YAFFS_OK;
4b070809 1100
0e8cc8bd
WJ		 1101 /* Calculate the tnode size in bytes for variable width tnode support.
1102 * Must be a multiple of 32-bits */
1103 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1104
1105 /* make these things */
1106
1107 newTnodes = YMALLOC(nTnodes * tnodeSize);
1108 mem = (__u8 *)newTnodes;
1109
1110 if (!newTnodes) {
1111 T(YAFFS_TRACE_ERROR,
1112 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1113 return YAFFS_FAIL;
1114 }
1115
1116 /* Hook them into the free list */
1117#if 0
1118 for (i = 0; i < nTnodes - 1; i++) {
1119 newTnodes[i].internal[0] = &newTnodes[i + 1];
1120#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1121 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1122#endif
1123 }
1124
1125 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1126#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1127 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1128#endif
1129 dev->freeTnodes = newTnodes;
1130#else
1131 /* New hookup for wide tnodes */
1132 for(i = 0; i < nTnodes -1; i++) {
1133 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1134 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1135 curr->internal[0] = next;
1136 }
4b070809 1137
0e8cc8bd
WJ		 1138 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1139 curr->internal[0] = dev->freeTnodes;
1140 dev->freeTnodes = (yaffs_Tnode *)mem;
1141
1142#endif
1143
1144
1145 dev->nFreeTnodes += nTnodes;
1146 dev->nTnodesCreated += nTnodes;
1147
1148 /* Now add this bunch of tnodes to a list for freeing up.
1149 * NB If we can't add this to the management list it isn't fatal
1150 * but it just means we can't free this bunch of tnodes later.
1151 */
4b070809 1152
0e8cc8bd
WJ		 1153 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1154 if (!tnl) {
1155 T(YAFFS_TRACE_ERROR,
1156 (TSTR
1157 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1158 return YAFFS_FAIL;
1159
1160 } else {
1161 tnl->tnodes = newTnodes;
1162 tnl->next = dev->allocatedTnodeList;
1163 dev->allocatedTnodeList = tnl;
1164 }
1165
1166 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1167
1168 return YAFFS_OK;
1169}
1170
1171/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1172
1173static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
1174{
1175 yaffs_Tnode *tn = NULL;
1176
1177 /* If there are none left make more */
1178 if (!dev->freeTnodes) {
1179 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1180 }
1181
1182 if (dev->freeTnodes) {
1183 tn = dev->freeTnodes;
1184#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1185 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1186 /* Hoosterman, this thing looks like it isn't in the list */
1187 T(YAFFS_TRACE_ALWAYS,
1188 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1189 }
1190#endif
1191 dev->freeTnodes = dev->freeTnodes->internal[0];
1192 dev->nFreeTnodes--;
1193 }
1194
1195 return tn;
1196}
1197
1198static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
1199{
1200 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
4b070809 1201
0e8cc8bd
WJ		 1202 if(tn)
1203 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1204
4b070809 1205 return tn;
0e8cc8bd
WJ		 1206}
1207
1208/* FreeTnode frees up a tnode and puts it back on the free list */
1209static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
1210{
1211 if (tn) {
1212#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1213 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1214 /* Hoosterman, this thing looks like it is already in the list */
1215 T(YAFFS_TRACE_ALWAYS,
1216 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1217 }
1218 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1219#endif
1220 tn->internal[0] = dev->freeTnodes;
1221 dev->freeTnodes = tn;
1222 dev->nFreeTnodes++;
1223 }
1224}
1225
1226static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
1227{
1228 /* Free the list of allocated tnodes */
1229 yaffs_TnodeList *tmp;
1230
1231 while (dev->allocatedTnodeList) {
1232 tmp = dev->allocatedTnodeList->next;
1233
1234 YFREE(dev->allocatedTnodeList->tnodes);
1235 YFREE(dev->allocatedTnodeList);
1236 dev->allocatedTnodeList = tmp;
1237
1238 }
1239
1240 dev->freeTnodes = NULL;
1241 dev->nFreeTnodes = 0;
1242}
1243
1244static void yaffs_InitialiseTnodes(yaffs_Device * dev)
1245{
1246 dev->allocatedTnodeList = NULL;
1247 dev->freeTnodes = NULL;
1248 dev->nFreeTnodes = 0;
1249 dev->nTnodesCreated = 0;
1250
1251}
1252
1253
1254void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
1255{
1256 __u32 *map = (__u32 *)tn;
1257 __u32 bitInMap;
1258 __u32 bitInWord;
1259 __u32 wordInMap;
1260 __u32 mask;
4b070809 1261
0e8cc8bd
WJ		 1262 pos &= YAFFS_TNODES_LEVEL0_MASK;
1263 val >>= dev->chunkGroupBits;
4b070809 1264
0e8cc8bd
WJ		 1265 bitInMap = pos * dev->tnodeWidth;
1266 wordInMap = bitInMap /32;
1267 bitInWord = bitInMap & (32 -1);
4b070809 1268
0e8cc8bd 1269 mask = dev->tnodeMask << bitInWord;
4b070809 1270
0e8cc8bd
WJ		 1271 map[wordInMap] &= ~mask;
1272 map[wordInMap] |= (mask & (val << bitInWord));
4b070809 1273
0e8cc8bd
WJ		 1274 if(dev->tnodeWidth > (32-bitInWord)) {
1275 bitInWord = (32 - bitInWord);
1276 wordInMap++;;
1277 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1278 map[wordInMap] &= ~mask;
1279 map[wordInMap] |= (mask & (val >> bitInWord));
1280 }
1281}
1282
1283static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
1284{
1285 __u32 *map = (__u32 *)tn;
1286 __u32 bitInMap;
1287 __u32 bitInWord;
1288 __u32 wordInMap;
1289 __u32 val;
4b070809 1290
0e8cc8bd 1291 pos &= YAFFS_TNODES_LEVEL0_MASK;
4b070809 1292
0e8cc8bd
WJ		 1293 bitInMap = pos * dev->tnodeWidth;
1294 wordInMap = bitInMap /32;
1295 bitInWord = bitInMap & (32 -1);
4b070809 1296
0e8cc8bd 1297 val = map[wordInMap] >> bitInWord;
4b070809 1298
0e8cc8bd
WJ		 1299 if(dev->tnodeWidth > (32-bitInWord)) {
1300 bitInWord = (32 - bitInWord);
1301 wordInMap++;;
1302 val |= (map[wordInMap] << bitInWord);
1303 }
4b070809 1304
0e8cc8bd
WJ		 1305 val &= dev->tnodeMask;
1306 val <<= dev->chunkGroupBits;
4b070809 1307
0e8cc8bd
WJ		 1308 return val;
1309}
1310
1311/* ------------------- End of individual tnode manipulation -----------------*/
1312
1313/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1314 * The look up tree is represented by the top tnode and the number of topLevel
1315 * in the tree. 0 means only the level 0 tnode is in the tree.
1316 */
1317
1318/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1319static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
1320 yaffs_FileStructure * fStruct,
1321 __u32 chunkId)
1322{
1323
1324 yaffs_Tnode *tn = fStruct->top;
1325 __u32 i;
1326 int requiredTallness;
1327 int level = fStruct->topLevel;
1328
1329 /* Check sane level and chunk Id */
1330 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
1331 return NULL;
1332 }
1333
1334 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1335 return NULL;
1336 }
1337
1338 /* First check we're tall enough (ie enough topLevel) */
1339
1340 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1341 requiredTallness = 0;
1342 while (i) {
1343 i >>= YAFFS_TNODES_INTERNAL_BITS;
1344 requiredTallness++;
1345 }
1346
1347 if (requiredTallness > fStruct->topLevel) {
1348 /* Not tall enough, so we can't find it, return NULL. */
1349 return NULL;
1350 }
1351
1352 /* Traverse down to level 0 */
1353 while (level > 0 && tn) {
1354 tn = tn->
1355 internal[(chunkId >>
4b070809
WD		 1356 ( YAFFS_TNODES_LEVEL0_BITS +
1357 (level - 1) *
1358 YAFFS_TNODES_INTERNAL_BITS)
0e8cc8bd
WJ		 1359 ) &
1360 YAFFS_TNODES_INTERNAL_MASK];
1361 level--;
1362
1363 }
1364
1365 return tn;
1366}
1367
1368/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1369 * This happens in two steps:
1370 * 1. If the tree isn't tall enough, then make it taller.
1371 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1372 *
1373 * Used when modifying the tree.
1374 *
1375 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1376 * be plugged into the ttree.
1377 */
4b070809 1378
0e8cc8bd
WJ		 1379static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
1380 yaffs_FileStructure * fStruct,
1381 __u32 chunkId,
1382 yaffs_Tnode *passedTn)
1383{
1384
1385 int requiredTallness;
1386 int i;
1387 int l;
1388 yaffs_Tnode *tn;
1389
1390 __u32 x;
1391
1392
1393 /* Check sane level and page Id */
1394 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
1395 return NULL;
1396 }
1397
1398 if (chunkId > YAFFS_MAX_CHUNK_ID) {
1399 return NULL;
1400 }
1401
1402 /* First check we're tall enough (ie enough topLevel) */
1403
1404 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1405 requiredTallness = 0;
1406 while (x) {
1407 x >>= YAFFS_TNODES_INTERNAL_BITS;
1408 requiredTallness++;
1409 }
1410
1411
1412 if (requiredTallness > fStruct->topLevel) {
1413 /* Not tall enough,gotta make the tree taller */
1414 for (i = fStruct->topLevel; i < requiredTallness; i++) {
4b070809 1415
0e8cc8bd
WJ		 1416 tn = yaffs_GetTnode(dev);
1417
1418 if (tn) {
1419 tn->internal[0] = fStruct->top;
1420 fStruct->top = tn;
1421 } else {
1422 T(YAFFS_TRACE_ERROR,
1423 (TSTR("yaffs: no more tnodes" TENDSTR)));
1424 }
1425 }
1426
1427 fStruct->topLevel = requiredTallness;
1428 }
1429
1430 /* Traverse down to level 0, adding anything we need */
1431
1432 l = fStruct->topLevel;
1433 tn = fStruct->top;
4b070809 1434
0e8cc8bd
WJ		 1435 if(l > 0) {
1436 while (l > 0 && tn) {
1437 x = (chunkId >>
1438 ( YAFFS_TNODES_LEVEL0_BITS +
1439 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1440 YAFFS_TNODES_INTERNAL_MASK;
1441
1442
1443 if((l>1) && !tn->internal[x]){
1444 /* Add missing non-level-zero tnode */
1445 tn->internal[x] = yaffs_GetTnode(dev);
1446
1447 } else if(l == 1) {
1448 /* Looking from level 1 at level 0 */
4b070809 1449 if (passedTn) {
0e8cc8bd
WJ		 1450 /* If we already have one, then release it.*/
1451 if(tn->internal[x])
1452 yaffs_FreeTnode(dev,tn->internal[x]);
1453 tn->internal[x] = passedTn;
4b070809 1454
0e8cc8bd
WJ		 1455 } else if(!tn->internal[x]) {
1456 /* Don't have one, none passed in */
1457 tn->internal[x] = yaffs_GetTnode(dev);
1458 }
1459 }
4b070809 1460
0e8cc8bd
WJ		 1461 tn = tn->internal[x];
1462 l--;
1463 }
1464 } else {
1465 /* top is level 0 */
1466 if(passedTn) {
1467 memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1468 yaffs_FreeTnode(dev,passedTn);
1469 }
1470 }
1471
1472 return tn;
1473}
1474
1475static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
1476 yaffs_ExtendedTags * tags, int objectId,
1477 int chunkInInode)
1478{
1479 int j;
1480
1481 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1482 if (yaffs_CheckChunkBit
1483 (dev, theChunk / dev->nChunksPerBlock,
1484 theChunk % dev->nChunksPerBlock)) {
1485 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1486 tags);
1487 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1488 /* found it; */
1489 return theChunk;
1490
1491 }
1492 }
1493 theChunk++;
1494 }
1495 return -1;
1496}
1497
0e8cc8bd
WJ		 1498static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1499{
1500
1501 yaffs_BlockInfo *theBlock;
1502
1503 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1504
1505 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1506 if (theBlock) {
1507 theBlock->softDeletions++;
1508 dev->nFreeChunks++;
1509 }
1510}
1511
1512/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1513 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1514 * of the tnode.
1515 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1516 */
4b070809 1517
0e8cc8bd
WJ		 1518static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1519 __u32 level, int chunkOffset)
1520{
1521 int i;
1522 int theChunk;
1523 int allDone = 1;
1524 yaffs_Device *dev = in->myDev;
1525
1526 if (tn) {
1527 if (level > 0) {
1528
1529 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1530 i--) {
1531 if (tn->internal[i]) {
1532 allDone =
1533 yaffs_SoftDeleteWorker(in,
1534 tn->
1535 internal[i],
1536 level - 1,
1537 (chunkOffset
1538 <<
1539 YAFFS_TNODES_INTERNAL_BITS)
1540 + i);
1541 if (allDone) {
1542 yaffs_FreeTnode(dev,
1543 tn->
1544 internal[i]);
1545 tn->internal[i] = NULL;
1546 } else {
1547 /* Hoosterman... how could this happen? */
1548 }
1549 }
1550 }
1551 return (allDone) ? 1 : 0;
1552 } else if (level == 0) {
1553
1554 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1555 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1556 if (theChunk) {
1557 /* Note this does not find the real chunk, only the chunk group.
4b070809 1558 * We make an assumption that a chunk group is not larger than
0e8cc8bd
WJ		 1559 * a block.
1560 */
1561 yaffs_SoftDeleteChunk(dev, theChunk);
1562 yaffs_PutLevel0Tnode(dev,tn,i,0);
1563 }
1564
1565 }
1566 return 1;
1567
1568 }
1569
1570 }
1571
1572 return 1;
1573
1574}
1575
1576static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1577{
1578 if (obj->deleted &&
1579 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1580 if (obj->nDataChunks <= 0) {
1581 /* Empty file with no duplicate object headers, just delete it immediately */
1582 yaffs_FreeTnode(obj->myDev,
1583 obj->variant.fileVariant.top);
1584 obj->variant.fileVariant.top = NULL;
1585 T(YAFFS_TRACE_TRACING,
1586 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1587 obj->objectId));
1588 yaffs_DoGenericObjectDeletion(obj);
1589 } else {
1590 yaffs_SoftDeleteWorker(obj,
1591 obj->variant.fileVariant.top,
1592 obj->variant.fileVariant.
1593 topLevel, 0);
1594 obj->softDeleted = 1;
1595 }
1596 }
1597}
1598
1599/* Pruning removes any part of the file structure tree that is beyond the
1600 * bounds of the file (ie that does not point to chunks).
1601 *
1602 * A file should only get pruned when its size is reduced.
1603 *
1604 * Before pruning, the chunks must be pulled from the tree and the
1605 * level 0 tnode entries must be zeroed out.
1606 * Could also use this for file deletion, but that's probably better handled
1607 * by a special case.
1608 */
1609
1610static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1611 __u32 level, int del0)
1612{
1613 int i;
1614 int hasData;
1615
1616 if (tn) {
1617 hasData = 0;
1618
1619 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1620 if (tn->internal[i] && level > 0) {
1621 tn->internal[i] =
1622 yaffs_PruneWorker(dev, tn->internal[i],
1623 level - 1,
1624 (i == 0) ? del0 : 1);
1625 }
1626
1627 if (tn->internal[i]) {
1628 hasData++;
1629 }
1630 }
1631
1632 if (hasData == 0 && del0) {
1633 /* Free and return NULL */
1634
1635 yaffs_FreeTnode(dev, tn);
1636 tn = NULL;
1637 }
1638
1639 }
1640
1641 return tn;
1642
1643}
1644
1645static int yaffs_PruneFileStructure(yaffs_Device * dev,
1646 yaffs_FileStructure * fStruct)
1647{
1648 int i;
1649 int hasData;
1650 int done = 0;
1651 yaffs_Tnode *tn;
1652
1653 if (fStruct->topLevel > 0) {
1654 fStruct->top =
1655 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1656
1657 /* Now we have a tree with all the non-zero branches NULL but the height
1658 * is the same as it was.
1659 * Let's see if we can trim internal tnodes to shorten the tree.
4b070809 1660 * We can do this if only the 0th element in the tnode is in use
0e8cc8bd
WJ		 1661 * (ie all the non-zero are NULL)
1662 */
1663
1664 while (fStruct->topLevel && !done) {
1665 tn = fStruct->top;
1666
1667 hasData = 0;
1668 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1669 if (tn->internal[i]) {
1670 hasData++;
1671 }
1672 }
1673
1674 if (!hasData) {
1675 fStruct->top = tn->internal[0];
1676 fStruct->topLevel--;
1677 yaffs_FreeTnode(dev, tn);
1678 } else {
1679 done = 1;
1680 }
1681 }
1682 }
1683
1684 return YAFFS_OK;
1685}
1686
1687/*-------------------- End of File Structure functions.-------------------*/
1688
1689/* yaffs_CreateFreeObjects creates a bunch more objects and
1690 * adds them to the object free list.
1691 */
1692static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1693{
1694 int i;
1695 yaffs_Object *newObjects;
1696 yaffs_ObjectList *list;
1697
1698 if (nObjects < 1)
1699 return YAFFS_OK;
1700
1701 /* make these things */
1702 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1703 list = YMALLOC(sizeof(yaffs_ObjectList));
1704
1705 if (!newObjects || !list) {
1706 if(newObjects)
1707 YFREE(newObjects);
1708 if(list)
1709 YFREE(list);
1710 T(YAFFS_TRACE_ALLOCATE,
1711 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1712 return YAFFS_FAIL;
1713 }
4b070809 1714
0e8cc8bd
WJ		 1715 /* Hook them into the free list */
1716 for (i = 0; i < nObjects - 1; i++) {
1717 newObjects[i].siblings.next =
1718 (struct list_head *)(&newObjects[i + 1]);
1719 }
1720
1721 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1722 dev->freeObjects = newObjects;
1723 dev->nFreeObjects += nObjects;
1724 dev->nObjectsCreated += nObjects;
1725
1726 /* Now add this bunch of Objects to a list for freeing up. */
1727
1728 list->objects = newObjects;
1729 list->next = dev->allocatedObjectList;
1730 dev->allocatedObjectList = list;
1731
1732 return YAFFS_OK;
1733}
1734
1735
1736/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1737static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1738{
1739 yaffs_Object *tn = NULL;
1740
1741 /* If there are none left make more */
1742 if (!dev->freeObjects) {
1743 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1744 }
1745
1746 if (dev->freeObjects) {
1747 tn = dev->freeObjects;
1748 dev->freeObjects =
1749 (yaffs_Object *) (dev->freeObjects->siblings.next);
1750 dev->nFreeObjects--;
1751
1752 /* Now sweeten it up... */
1753
1754 memset(tn, 0, sizeof(yaffs_Object));
1755 tn->myDev = dev;
1756 tn->chunkId = -1;
1757 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1758 INIT_LIST_HEAD(&(tn->hardLinks));
1759 INIT_LIST_HEAD(&(tn->hashLink));
1760 INIT_LIST_HEAD(&tn->siblings);
1761
1762 /* Add it to the lost and found directory.
1763 * NB Can't put root or lostNFound in lostNFound so
1764 * check if lostNFound exists first
1765 */
1766 if (dev->lostNFoundDir) {
1767 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1768 }
1769 }
1770
1771 return tn;
1772}
1773
1774static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1775 __u32 mode)
1776{
1777
1778 yaffs_Object *obj =
1779 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1780 if (obj) {
1781 obj->fake = 1; /* it is fake so it has no NAND presence... */
1782 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1783 obj->unlinkAllowed = 0; /* ... or unlink it */
1784 obj->deleted = 0;
1785 obj->unlinked = 0;
1786 obj->yst_mode = mode;
1787 obj->myDev = dev;
1788 obj->chunkId = 0; /* Not a valid chunk. */
1789 }
1790
1791 return obj;
1792
1793}
1794
1795static void yaffs_UnhashObject(yaffs_Object * tn)
1796{
1797 int bucket;
1798 yaffs_Device *dev = tn->myDev;
1799
1800 /* If it is still linked into the bucket list, free from the list */
1801 if (!list_empty(&tn->hashLink)) {
1802 list_del_init(&tn->hashLink);
1803 bucket = yaffs_HashFunction(tn->objectId);
1804 dev->objectBucket[bucket].count--;
1805 }
1806
1807}
1808
1809/* FreeObject frees up a Object and puts it back on the free list */
1810static void yaffs_FreeObject(yaffs_Object * tn)
1811{
1812
1813 yaffs_Device *dev = tn->myDev;
1814
90ef117b
WJ		 1815/* XXX U-BOOT XXX */
1816#if 0
0e8cc8bd
WJ		 1817#ifdef __KERNEL__
1818 if (tn->myInode) {
1819 /* We're still hooked up to a cached inode.
1820 * Don't delete now, but mark for later deletion
1821 */
1822 tn->deferedFree = 1;
1823 return;
1824 }
1825#endif
90ef117b 1826#endif
0e8cc8bd
WJ		 1827 yaffs_UnhashObject(tn);
1828
1829 /* Link into the free list. */
1830 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1831 dev->freeObjects = tn;
1832 dev->nFreeObjects++;
1833}
1834
90ef117b
WJ		 1835/* XXX U-BOOT XXX */
1836#if 0
0e8cc8bd
WJ		 1837#ifdef __KERNEL__
1838
1839void yaffs_HandleDeferedFree(yaffs_Object * obj)
1840{
1841 if (obj->deferedFree) {
1842 yaffs_FreeObject(obj);
1843 }
1844}
1845
90ef117b 1846#endif
0e8cc8bd
WJ		 1847#endif
1848
1849static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1850{
1851 /* Free the list of allocated Objects */
1852
1853 yaffs_ObjectList *tmp;
1854
1855 while (dev->allocatedObjectList) {
1856 tmp = dev->allocatedObjectList->next;
1857 YFREE(dev->allocatedObjectList->objects);
1858 YFREE(dev->allocatedObjectList);
1859
1860 dev->allocatedObjectList = tmp;
1861 }
1862
1863 dev->freeObjects = NULL;
1864 dev->nFreeObjects = 0;
1865}
1866
1867static void yaffs_InitialiseObjects(yaffs_Device * dev)
1868{
1869 int i;
1870
1871 dev->allocatedObjectList = NULL;
1872 dev->freeObjects = NULL;
1873 dev->nFreeObjects = 0;
1874
1875 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1876 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1877 dev->objectBucket[i].count = 0;
1878 }
1879
1880}
1881
1882static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
1883{
1884 static int x = 0;
1885 int i;
1886 int l = 999;
1887 int lowest = 999999;
1888
1889 /* First let's see if we can find one that's empty. */
1890
1891 for (i = 0; i < 10 && lowest > 0; i++) {
1892 x++;
1893 x %= YAFFS_NOBJECT_BUCKETS;
1894 if (dev->objectBucket[x].count < lowest) {
1895 lowest = dev->objectBucket[x].count;
1896 l = x;
1897 }
1898
1899 }
1900
1901 /* If we didn't find an empty list, then try
1902 * looking a bit further for a short one
1903 */
1904
1905 for (i = 0; i < 10 && lowest > 3; i++) {
1906 x++;
1907 x %= YAFFS_NOBJECT_BUCKETS;
1908 if (dev->objectBucket[x].count < lowest) {
1909 lowest = dev->objectBucket[x].count;
1910 l = x;
1911 }
1912
1913 }
1914
1915 return l;
1916}
1917
1918static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
1919{
1920 int bucket = yaffs_FindNiceObjectBucket(dev);
1921
1922 /* Now find an object value that has not already been taken
1923 * by scanning the list.
1924 */
1925
1926 int found = 0;
1927 struct list_head *i;
1928
1929 __u32 n = (__u32) bucket;
1930
1931 /* yaffs_CheckObjectHashSanity(); */
1932
1933 while (!found) {
1934 found = 1;
1935 n += YAFFS_NOBJECT_BUCKETS;
1936 if (1 || dev->objectBucket[bucket].count > 0) {
1937 list_for_each(i, &dev->objectBucket[bucket].list) {
1938 /* If there is already one in the list */
1939 if (i
1940 && list_entry(i, yaffs_Object,
1941 hashLink)->objectId == n) {
1942 found = 0;
1943 }
1944 }
1945 }
1946 }
1947
1948
1949 return n;
1950}
1951
1952static void yaffs_HashObject(yaffs_Object * in)
1953{
1954 int bucket = yaffs_HashFunction(in->objectId);
1955 yaffs_Device *dev = in->myDev;
1956
1957 list_add(&in->hashLink, &dev->objectBucket[bucket].list);
1958 dev->objectBucket[bucket].count++;
1959
1960}
1961
1962yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
1963{
1964 int bucket = yaffs_HashFunction(number);
1965 struct list_head *i;
1966 yaffs_Object *in;
1967
1968 list_for_each(i, &dev->objectBucket[bucket].list) {
1969 /* Look if it is in the list */
1970 if (i) {
1971 in = list_entry(i, yaffs_Object, hashLink);
1972 if (in->objectId == number) {
90ef117b
WJ		 1973/* XXX U-BOOT XXX */
1974#if 0
0e8cc8bd
WJ		 1975#ifdef __KERNEL__
1976 /* Don't tell the VFS about this one if it is defered free */
1977 if (in->deferedFree)
1978 return NULL;
1979#endif
90ef117b 1980#endif
0e8cc8bd
WJ		 1981 return in;
1982 }
1983 }
1984 }
1985
1986 return NULL;
1987}
1988
1989yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
1990 yaffs_ObjectType type)
1991{
1992
1993 yaffs_Object *theObject;
068d6f9a 1994 yaffs_Tnode *tn = NULL;
0e8cc8bd
WJ		 1995
1996 if (number < 0) {
1997 number = yaffs_CreateNewObjectNumber(dev);
1998 }
1999
2000 theObject = yaffs_AllocateEmptyObject(dev);
2001 if(!theObject)
2002 return NULL;
4b070809 2003
0e8cc8bd
WJ		 2004 if(type == YAFFS_OBJECT_TYPE_FILE){
2005 tn = yaffs_GetTnode(dev);
2006 if(!tn){
2007 yaffs_FreeObject(theObject);
2008 return NULL;
2009 }
2010 }
4b070809
WD		 2011
2012
0e8cc8bd
WJ		 2013
2014 if (theObject) {
2015 theObject->fake = 0;
2016 theObject->renameAllowed = 1;
2017 theObject->unlinkAllowed = 1;
2018 theObject->objectId = number;
2019 yaffs_HashObject(theObject);
2020 theObject->variantType = type;
2021#ifdef CONFIG_YAFFS_WINCE
2022 yfsd_WinFileTimeNow(theObject->win_atime);
2023 theObject->win_ctime[0] = theObject->win_mtime[0] =
2024 theObject->win_atime[0];
2025 theObject->win_ctime[1] = theObject->win_mtime[1] =
2026 theObject->win_atime[1];
2027
2028#else
2029
2030 theObject->yst_atime = theObject->yst_mtime =
2031 theObject->yst_ctime = Y_CURRENT_TIME;
2032#endif
2033 switch (type) {
2034 case YAFFS_OBJECT_TYPE_FILE:
2035 theObject->variant.fileVariant.fileSize = 0;
2036 theObject->variant.fileVariant.scannedFileSize = 0;
2037 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2038 theObject->variant.fileVariant.topLevel = 0;
2039 theObject->variant.fileVariant.top = tn;
2040 break;
2041 case YAFFS_OBJECT_TYPE_DIRECTORY:
2042 INIT_LIST_HEAD(&theObject->variant.directoryVariant.
2043 children);
2044 break;
2045 case YAFFS_OBJECT_TYPE_SYMLINK:
2046 case YAFFS_OBJECT_TYPE_HARDLINK:
2047 case YAFFS_OBJECT_TYPE_SPECIAL:
2048 /* No action required */
2049 break;
2050 case YAFFS_OBJECT_TYPE_UNKNOWN:
2051 /* todo this should not happen */
2052 break;
2053 }
2054 }
2055
2056 return theObject;
2057}
2058
2059static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
2060 int number,
2061 yaffs_ObjectType type)
2062{
2063 yaffs_Object *theObject = NULL;
2064
2065 if (number > 0) {
2066 theObject = yaffs_FindObjectByNumber(dev, number);
2067 }
2068
2069 if (!theObject) {
2070 theObject = yaffs_CreateNewObject(dev, number, type);
2071 }
2072
2073 return theObject;
2074
2075}
4b070809 2076
0e8cc8bd
WJ		 2077
2078static YCHAR *yaffs_CloneString(const YCHAR * str)
2079{
2080 YCHAR *newStr = NULL;
2081
2082 if (str && *str) {
2083 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2084 if(newStr)
2085 yaffs_strcpy(newStr, str);
2086 }
2087
2088 return newStr;
2089
2090}
2091
2092/*
2093 * Mknod (create) a new object.
2094 * equivalentObject only has meaning for a hard link;
2095 * aliasString only has meaning for a sumlink.
2096 * rdev only has meaning for devices (a subset of special objects)
2097 */
4b070809 2098
0e8cc8bd
WJ		 2099static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2100 yaffs_Object * parent,
2101 const YCHAR * name,
2102 __u32 mode,
2103 __u32 uid,
2104 __u32 gid,
2105 yaffs_Object * equivalentObject,
2106 const YCHAR * aliasString, __u32 rdev)
2107{
2108 yaffs_Object *in;
068d6f9a 2109 YCHAR *str = NULL;
0e8cc8bd
WJ		 2110
2111 yaffs_Device *dev = parent->myDev;
2112
2113 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2114 if (yaffs_FindObjectByName(parent, name)) {
2115 return NULL;
2116 }
2117
2118 in = yaffs_CreateNewObject(dev, -1, type);
4b070809 2119
0e8cc8bd
WJ		 2120 if(type == YAFFS_OBJECT_TYPE_SYMLINK){
2121 str = yaffs_CloneString(aliasString);
2122 if(!str){
2123 yaffs_FreeObject(in);
2124 return NULL;
2125 }
2126 }
4b070809
WD		 2127
2128
0e8cc8bd
WJ		 2129
2130 if (in) {
2131 in->chunkId = -1;
2132 in->valid = 1;
2133 in->variantType = type;
2134
2135 in->yst_mode = mode;
2136
2137#ifdef CONFIG_YAFFS_WINCE
2138 yfsd_WinFileTimeNow(in->win_atime);
2139 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2140 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2141
2142#else
2143 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2144
2145 in->yst_rdev = rdev;
2146 in->yst_uid = uid;
2147 in->yst_gid = gid;
2148#endif
2149 in->nDataChunks = 0;
2150
2151 yaffs_SetObjectName(in, name);
2152 in->dirty = 1;
2153
2154 yaffs_AddObjectToDirectory(parent, in);
2155
2156 in->myDev = parent->myDev;
2157
2158 switch (type) {
2159 case YAFFS_OBJECT_TYPE_SYMLINK:
2160 in->variant.symLinkVariant.alias = str;
2161 break;
2162 case YAFFS_OBJECT_TYPE_HARDLINK:
2163 in->variant.hardLinkVariant.equivalentObject =
2164 equivalentObject;
2165 in->variant.hardLinkVariant.equivalentObjectId =
2166 equivalentObject->objectId;
2167 list_add(&in->hardLinks, &equivalentObject->hardLinks);
2168 break;
4b070809 2169 case YAFFS_OBJECT_TYPE_FILE:
0e8cc8bd
WJ		 2170 case YAFFS_OBJECT_TYPE_DIRECTORY:
2171 case YAFFS_OBJECT_TYPE_SPECIAL:
2172 case YAFFS_OBJECT_TYPE_UNKNOWN:
2173 /* do nothing */
2174 break;
2175 }
2176
2177 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2178 /* Could not create the object header, fail the creation */
2179 yaffs_DestroyObject(in);
2180 in = NULL;
2181 }
2182
2183 }
2184
2185 return in;
2186}
2187
2188yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
2189 __u32 mode, __u32 uid, __u32 gid)
2190{
2191 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2192 uid, gid, NULL, NULL, 0);
2193}
2194
2195yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
2196 __u32 mode, __u32 uid, __u32 gid)
2197{
2198 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2199 mode, uid, gid, NULL, NULL, 0);
2200}
2201
2202yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
2203 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2204{
2205 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2206 uid, gid, NULL, NULL, rdev);
2207}
2208
2209yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
2210 __u32 mode, __u32 uid, __u32 gid,
2211 const YCHAR * alias)
2212{
2213 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2214 uid, gid, NULL, alias, 0);
2215}
2216
2217/* yaffs_Link returns the object id of the equivalent object.*/
2218yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
2219 yaffs_Object * equivalentObject)
2220{
2221 /* Get the real object in case we were fed a hard link as an equivalent object */
2222 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2223
2224 if (yaffs_MknodObject
2225 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2226 equivalentObject, NULL, 0)) {
2227 return equivalentObject;
2228 } else {
2229 return NULL;
2230 }
2231
2232}
2233
2234static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
2235 const YCHAR * newName, int force, int shadows)
2236{
2237 int unlinkOp;
2238 int deleteOp;
2239
2240 yaffs_Object *existingTarget;
2241
2242 if (newDir == NULL) {
2243 newDir = obj->parent; /* use the old directory */
2244 }
2245
2246 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2247 T(YAFFS_TRACE_ALWAYS,
2248 (TSTR
2249 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
2250 TENDSTR)));
2251 YBUG();
2252 }
4b070809 2253
0e8cc8bd
WJ		 2254 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2255 if (obj->myDev->isYaffs2) {
2256 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2257 } else {
2258 unlinkOp = (newDir == obj->myDev->unlinkedDir
2259 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2260 }
2261
2262 deleteOp = (newDir == obj->myDev->deletedDir);
2263
2264 existingTarget = yaffs_FindObjectByName(newDir, newName);
2265
4b070809 2266 /* If the object is a file going into the unlinked directory,
0e8cc8bd 2267 * then it is OK to just stuff it in since duplicate names are allowed.
4b070809 2268 * else only proceed if the new name does not exist and if we're putting
0e8cc8bd
WJ		 2269 * it into a directory.
2270 */
2271 if ((unlinkOp ||
2272 deleteOp ||
2273 force ||
2274 (shadows > 0) ||
2275 !existingTarget) &&
2276 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2277 yaffs_SetObjectName(obj, newName);
2278 obj->dirty = 1;
2279
2280 yaffs_AddObjectToDirectory(newDir, obj);
2281
2282 if (unlinkOp)
2283 obj->unlinked = 1;
2284
2285 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2286 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
2287 return YAFFS_OK;
2288 }
2289
2290 return YAFFS_FAIL;
2291}
2292
2293int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
2294 yaffs_Object * newDir, const YCHAR * newName)
2295{
2296 yaffs_Object *obj;
2297 yaffs_Object *existingTarget;
2298 int force = 0;
2299
2300#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2301 /* Special case for case insemsitive systems (eg. WinCE).
2302 * While look-up is case insensitive, the name isn't.
2303 * Therefore we might want to change x.txt to X.txt
2304 */
2305 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
2306 force = 1;
2307 }
2308#endif
2309
2310 obj = yaffs_FindObjectByName(oldDir, oldName);
2311 /* Check new name to long. */
2312 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
2313 yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
2314 /* ENAMETOOLONG */
2315 return YAFFS_FAIL;
2316 else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
2317 yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2318 /* ENAMETOOLONG */
2319 return YAFFS_FAIL;
2320
2321 if (obj && obj->renameAllowed) {
2322
2323 /* Now do the handling for an existing target, if there is one */
2324
2325 existingTarget = yaffs_FindObjectByName(newDir, newName);
2326 if (existingTarget &&
2327 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2328 !list_empty(&existingTarget->variant.directoryVariant.children)) {
2329 /* There is a target that is a non-empty directory, so we fail */
2330 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2331 } else if (existingTarget && existingTarget != obj) {
4b070809 2332 /* Nuke the target first, using shadowing,
0e8cc8bd
WJ		 2333 * but only if it isn't the same object
2334 */
2335 yaffs_ChangeObjectName(obj, newDir, newName, force,
2336 existingTarget->objectId);
2337 yaffs_UnlinkObject(existingTarget);
2338 }
2339
2340 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2341 }
2342 return YAFFS_FAIL;
2343}
2344
2345/*------------------------- Block Management and Page Allocation ----------------*/
2346
2347static int yaffs_InitialiseBlocks(yaffs_Device * dev)
2348{
2349 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4b070809 2350
0e8cc8bd
WJ		 2351 dev->blockInfo = NULL;
2352 dev->chunkBits = NULL;
4b070809 2353
0e8cc8bd
WJ		 2354 dev->allocationBlock = -1; /* force it to get a new one */
2355
2356 /* If the first allocation strategy fails, thry the alternate one */
2357 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2358 if(!dev->blockInfo){
2359 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2360 dev->blockInfoAlt = 1;
2361 }
2362 else
2363 dev->blockInfoAlt = 0;
4b070809 2364
0e8cc8bd 2365 if(dev->blockInfo){
4b070809 2366
0e8cc8bd
WJ		 2367 /* Set up dynamic blockinfo stuff. */
2368 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2369 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2370 if(!dev->chunkBits){
2371 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2372 dev->chunkBitsAlt = 1;
2373 }
2374 else
2375 dev->chunkBitsAlt = 0;
2376 }
4b070809 2377
0e8cc8bd
WJ		 2378 if (dev->blockInfo && dev->chunkBits) {
2379 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2380 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2381 return YAFFS_OK;
2382 }
2383
2384 return YAFFS_FAIL;
2385
2386}
2387
2388static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
2389{
2390 if(dev->blockInfoAlt && dev->blockInfo)
2391 YFREE_ALT(dev->blockInfo);
2392 else if(dev->blockInfo)
2393 YFREE(dev->blockInfo);
2394
2395 dev->blockInfoAlt = 0;
2396
2397 dev->blockInfo = NULL;
4b070809 2398
0e8cc8bd
WJ		 2399 if(dev->chunkBitsAlt && dev->chunkBits)
2400 YFREE_ALT(dev->chunkBits);
2401 else if(dev->chunkBits)
2402 YFREE(dev->chunkBits);
2403 dev->chunkBitsAlt = 0;
2404 dev->chunkBits = NULL;
2405}
2406
2407static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
2408 yaffs_BlockInfo * bi)
2409{
2410 int i;
2411 __u32 seq;
2412 yaffs_BlockInfo *b;
2413
2414 if (!dev->isYaffs2)
2415 return 1; /* disqualification only applies to yaffs2. */
2416
2417 if (!bi->hasShrinkHeader)
2418 return 1; /* can gc */
2419
2420 /* Find the oldest dirty sequence number if we don't know it and save it
2421 * so we don't have to keep recomputing it.
2422 */
2423 if (!dev->oldestDirtySequence) {
2424 seq = dev->sequenceNumber;
2425
2426 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2427 i++) {
2428 b = yaffs_GetBlockInfo(dev, i);
2429 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2430 (b->pagesInUse - b->softDeletions) <
2431 dev->nChunksPerBlock && b->sequenceNumber < seq) {
2432 seq = b->sequenceNumber;
2433 }
2434 }
2435 dev->oldestDirtySequence = seq;
2436 }
2437
2438 /* Can't do gc of this block if there are any blocks older than this one that have
2439 * discarded pages.
2440 */
2441 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2442
2443}
2444
2445/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2446 * for garbage collection.
2447 */
2448
2449static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
2450 int aggressive)
2451{
2452
2453 int b = dev->currentDirtyChecker;
2454
2455 int i;
2456 int iterations;
2457 int dirtiest = -1;
2458 int pagesInUse = 0;
2459 int prioritised=0;
2460 yaffs_BlockInfo *bi;
2461 int pendingPrioritisedExist = 0;
4b070809 2462
0e8cc8bd
WJ		 2463 /* First let's see if we need to grab a prioritised block */
2464 if(dev->hasPendingPrioritisedGCs){
2465 for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
2466
2467 bi = yaffs_GetBlockInfo(dev, i);
2468 //yaffs_VerifyBlock(dev,bi,i);
4b070809 2469
0e8cc8bd
WJ		 2470 if(bi->gcPrioritise) {
2471 pendingPrioritisedExist = 1;
2472 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2473 yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
2474 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2475 dirtiest = i;
2476 prioritised = 1;
2477 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2478 }
2479 }
2480 }
4b070809 2481
0e8cc8bd
WJ		 2482 if(!pendingPrioritisedExist) /* None found, so we can clear this */
2483 dev->hasPendingPrioritisedGCs = 0;
2484 }
2485
2486 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2487 * search harder.
2488 * else (we're doing a leasurely gc), then we only bother to do this if the
2489 * block has only a few pages in use.
2490 */
2491
2492 dev->nonAggressiveSkip--;
2493
2494 if (!aggressive && (dev->nonAggressiveSkip > 0)) {
2495 return -1;
2496 }
2497
2498 if(!prioritised)
2499 pagesInUse =
4b070809 2500 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
0e8cc8bd
WJ		 2501
2502 if (aggressive) {
2503 iterations =
2504 dev->internalEndBlock - dev->internalStartBlock + 1;
2505 } else {
2506 iterations =
2507 dev->internalEndBlock - dev->internalStartBlock + 1;
2508 iterations = iterations / 16;
2509 if (iterations > 200) {
2510 iterations = 200;
2511 }
2512 }
2513
2514 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2515 b++;
2516 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2517 b = dev->internalStartBlock;
2518 }
2519
2520 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2521 T(YAFFS_TRACE_ERROR,
2522 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2523 YBUG();
2524 }
2525
2526 bi = yaffs_GetBlockInfo(dev, b);
2527
2528#if 0
2529 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
2530 dirtiest = b;
2531 pagesInUse = 0;
2532 }
4b070809 2533 else
0e8cc8bd
WJ		 2534#endif
2535
2536 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2537 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
4b070809 2538 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
0e8cc8bd
WJ		 2539 dirtiest = b;
2540 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2541 }
2542 }
2543
2544 dev->currentDirtyChecker = b;
2545
2546 if (dirtiest > 0) {
2547 T(YAFFS_TRACE_GC,
2548 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2549 dev->nChunksPerBlock - pagesInUse,prioritised));
2550 }
2551
2552 dev->oldestDirtySequence = 0;
2553
2554 if (dirtiest > 0) {
2555 dev->nonAggressiveSkip = 4;
2556 }
2557
2558 return dirtiest;
2559}
2560
2561static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
2562{
2563 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2564
2565 int erasedOk = 0;
2566
2567 /* If the block is still healthy erase it and mark as clean.
2568 * If the block has had a data failure, then retire it.
2569 */
4b070809 2570
0e8cc8bd
WJ		 2571 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2572 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2573 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
4b070809 2574
0e8cc8bd
WJ		 2575 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2576
2577 if (!bi->needsRetiring) {
2578 yaffs_InvalidateCheckpoint(dev);
2579 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2580 if (!erasedOk) {
2581 dev->nErasureFailures++;
2582 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2583 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2584 }
2585 }
2586
4b070809 2587 if (erasedOk &&
0e8cc8bd
WJ		 2588 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2589 int i;
2590 for (i = 0; i < dev->nChunksPerBlock; i++) {
2591 if (!yaffs_CheckChunkErased
2592 (dev, blockNo * dev->nChunksPerBlock + i)) {
2593 T(YAFFS_TRACE_ERROR,
2594 (TSTR
2595 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2596 TENDSTR), blockNo, i));
2597 }
2598 }
2599 }
2600
2601 if (erasedOk) {
2602 /* Clean it up... */
2603 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2604 dev->nErasedBlocks++;
2605 bi->pagesInUse = 0;
2606 bi->softDeletions = 0;
2607 bi->hasShrinkHeader = 0;
2608 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2609 bi->gcPrioritise = 0;
2610 yaffs_ClearChunkBits(dev, blockNo);
2611
2612 T(YAFFS_TRACE_ERASE,
2613 (TSTR("Erased block %d" TENDSTR), blockNo));
2614 } else {
2615 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
2616
2617 yaffs_RetireBlock(dev, blockNo);
2618 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2619 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2620 }
2621}
2622
2623static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2624{
2625 int i;
2626
2627 yaffs_BlockInfo *bi;
2628
2629 if (dev->nErasedBlocks < 1) {
2630 /* Hoosterman we've got a problem.
2631 * Can't get space to gc
2632 */
2633 T(YAFFS_TRACE_ERROR,
2634 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2635
2636 return -1;
2637 }
4b070809 2638
0e8cc8bd
WJ		 2639 /* Find an empty block. */
2640
2641 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2642 dev->allocationBlockFinder++;
2643 if (dev->allocationBlockFinder < dev->internalStartBlock
2644 || dev->allocationBlockFinder > dev->internalEndBlock) {
2645 dev->allocationBlockFinder = dev->internalStartBlock;
2646 }
2647
2648 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2649
2650 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2651 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2652 dev->sequenceNumber++;
2653 bi->sequenceNumber = dev->sequenceNumber;
2654 dev->nErasedBlocks--;
2655 T(YAFFS_TRACE_ALLOCATE,
2656 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2657 dev->allocationBlockFinder, dev->sequenceNumber,
2658 dev->nErasedBlocks));
2659 return dev->allocationBlockFinder;
2660 }
2661 }
2662
2663 T(YAFFS_TRACE_ALWAYS,
2664 (TSTR
2665 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2666 TENDSTR), dev->nErasedBlocks));
2667
2668 return -1;
2669}
2670
2671
2672// Check if there's space to allocate...
2673// Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2674static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2675{
2676 int reservedChunks;
2677 int reservedBlocks = dev->nReservedBlocks;
2678 int checkpointBlocks;
4b070809 2679
0e8cc8bd
WJ		 2680 checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
2681 if(checkpointBlocks < 0)
2682 checkpointBlocks = 0;
4b070809 2683
0e8cc8bd 2684 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
4b070809 2685
0e8cc8bd
WJ		 2686 return (dev->nFreeChunks > reservedChunks);
2687}
2688
2689static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
2690{
2691 int retVal;
2692 yaffs_BlockInfo *bi;
2693
2694 if (dev->allocationBlock < 0) {
2695 /* Get next block to allocate off */
2696 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2697 dev->allocationPage = 0;
2698 }
2699
2700 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2701 /* Not enough space to allocate unless we're allowed to use the reserve. */
2702 return -1;
2703 }
2704
2705 if (dev->nErasedBlocks < dev->nReservedBlocks
2706 && dev->allocationPage == 0) {
2707 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2708 }
2709
2710 /* Next page please.... */
2711 if (dev->allocationBlock >= 0) {
2712 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2713
2714 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2715 dev->allocationPage;
2716 bi->pagesInUse++;
2717 yaffs_SetChunkBit(dev, dev->allocationBlock,
2718 dev->allocationPage);
2719
2720 dev->allocationPage++;
2721
2722 dev->nFreeChunks--;
2723
2724 /* If the block is full set the state to full */
2725 if (dev->allocationPage >= dev->nChunksPerBlock) {
2726 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2727 dev->allocationBlock = -1;
2728 }
2729
2730 if(blockUsedPtr)
2731 *blockUsedPtr = bi;
4b070809 2732
0e8cc8bd
WJ		 2733 return retVal;
2734 }
4b070809 2735
0e8cc8bd
WJ		 2736 T(YAFFS_TRACE_ERROR,
2737 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2738
2739 return -1;
2740}
2741
2742static int yaffs_GetErasedChunks(yaffs_Device * dev)
2743{
2744 int n;
2745
2746 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2747
2748 if (dev->allocationBlock > 0) {
2749 n += (dev->nChunksPerBlock - dev->allocationPage);
2750 }
2751
2752 return n;
2753
2754}
2755
2756static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2757{
2758 int oldChunk;
2759 int newChunk;
2760 int chunkInBlock;
2761 int markNAND;
2762 int retVal = YAFFS_OK;
2763 int cleanups = 0;
2764 int i;
2765 int isCheckpointBlock;
2766 int matchingChunk;
2767
2768 int chunksBefore = yaffs_GetErasedChunks(dev);
2769 int chunksAfter;
2770
2771 yaffs_ExtendedTags tags;
2772
2773 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2774
2775 yaffs_Object *object;
2776
2777 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
4b070809 2778
0e8cc8bd
WJ		 2779 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2780
2781 T(YAFFS_TRACE_TRACING,
2782 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2783 bi->pagesInUse, bi->hasShrinkHeader));
2784
2785 /*yaffs_VerifyFreeChunks(dev); */
2786
2787 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2788
2789 /* Take off the number of soft deleted entries because
2790 * they're going to get really deleted during GC.
2791 */
2792 dev->nFreeChunks -= bi->softDeletions;
2793
2794 dev->isDoingGC = 1;
2795
2796 if (isCheckpointBlock ||
2797 !yaffs_StillSomeChunkBits(dev, block)) {
2798 T(YAFFS_TRACE_TRACING,
2799 (TSTR
2800 ("Collecting block %d that has no chunks in use" TENDSTR),
2801 block));
2802 yaffs_BlockBecameDirty(dev, block);
2803 } else {
2804
2805 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
4b070809 2806
0e8cc8bd
WJ		 2807 yaffs_VerifyBlock(dev,bi,block);
2808
2809 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2810 chunkInBlock < dev->nChunksPerBlock
2811 && yaffs_StillSomeChunkBits(dev, block);
2812 chunkInBlock++, oldChunk++) {
2813 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2814
2815 /* This page is in use and might need to be copied off */
2816
2817 markNAND = 1;
2818
2819 yaffs_InitialiseTags(&tags);
2820
2821 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2822 buffer, &tags);
2823
2824 object =
2825 yaffs_FindObjectByNumber(dev,
2826 tags.objectId);
2827
2828 T(YAFFS_TRACE_GC_DETAIL,
2829 (TSTR
2830 ("Collecting page %d, %d %d %d " TENDSTR),
2831 chunkInBlock, tags.objectId, tags.chunkId,
2832 tags.byteCount));
4b070809 2833
0e8cc8bd
WJ		 2834 if(object && !yaffs_SkipVerification(dev)){
2835 if(tags.chunkId == 0)
2836 matchingChunk = object->chunkId;
2837 else if(object->softDeleted)
2838 matchingChunk = oldChunk; /* Defeat the test */
2839 else
2840 matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
4b070809 2841
0e8cc8bd
WJ		 2842 if(oldChunk != matchingChunk)
2843 T(YAFFS_TRACE_ERROR,
2844 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2845 oldChunk,matchingChunk,tags.objectId, tags.chunkId));
4b070809 2846
0e8cc8bd
WJ		 2847 }
2848
2849 if (!object) {
2850 T(YAFFS_TRACE_ERROR,
2851 (TSTR
2852 ("page %d in gc has no object: %d %d %d "
2853 TENDSTR), oldChunk,
2854 tags.objectId, tags.chunkId, tags.byteCount));
2855 }
2856
2857 if (object && object->deleted
2858 && tags.chunkId != 0) {
2859 /* Data chunk in a deleted file, throw it away
2860 * It's a soft deleted data chunk,
4b070809 2861 * No need to copy this, just forget about it and
0e8cc8bd
WJ		 2862 * fix up the object.
2863 */
2864
2865 object->nDataChunks--;
2866
2867 if (object->nDataChunks <= 0) {
2868 /* remeber to clean up the object */
2869 dev->gcCleanupList[cleanups] =
2870 tags.objectId;
2871 cleanups++;
2872 }
2873 markNAND = 0;
2874 } else if (0
2875 /* Todo object && object->deleted && object->nDataChunks == 0 */
2876 ) {
2877 /* Deleted object header with no data chunks.
2878 * Can be discarded and the file deleted.
2879 */
2880 object->chunkId = 0;
2881 yaffs_FreeTnode(object->myDev,
2882 object->variant.
2883 fileVariant.top);
2884 object->variant.fileVariant.top = NULL;
2885 yaffs_DoGenericObjectDeletion(object);
2886
2887 } else if (object) {
2888 /* It's either a data chunk in a live file or
2889 * an ObjectHeader, so we're interested in it.
2890 * NB Need to keep the ObjectHeaders of deleted files
2891 * until the whole file has been deleted off
2892 */
2893 tags.serialNumber++;
2894
2895 dev->nGCCopies++;
2896
2897 if (tags.chunkId == 0) {
2898 /* It is an object Id,
2899 * We need to nuke the shrinkheader flags first
2900 * We no longer want the shrinkHeader flag since its work is done
2901 * and if it is left in place it will mess up scanning.
2902 * Also, clear out any shadowing stuff
2903 */
2904
2905 yaffs_ObjectHeader *oh;
2906 oh = (yaffs_ObjectHeader *)buffer;
2907 oh->isShrink = 0;
2908 oh->shadowsObject = -1;
2909 tags.extraShadows = 0;
2910 tags.extraIsShrinkHeader = 0;
4b070809 2911
0e8cc8bd
WJ		 2912 yaffs_VerifyObjectHeader(object,oh,&tags,1);
2913 }
2914
2915 newChunk =
2916 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2917
2918 if (newChunk < 0) {
2919 retVal = YAFFS_FAIL;
2920 } else {
2921
2922 /* Ok, now fix up the Tnodes etc. */
2923
2924 if (tags.chunkId == 0) {
2925 /* It's a header */
2926 object->chunkId = newChunk;
2927 object->serial = tags.serialNumber;
2928 } else {
2929 /* It's a data chunk */
2930 yaffs_PutChunkIntoFile
2931 (object,
2932 tags.chunkId,
2933 newChunk, 0);
2934 }
2935 }
2936 }
2937
2938 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2939
2940 }
2941 }
2942
2943 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2944
2945
2946 /* Do any required cleanups */
2947 for (i = 0; i < cleanups; i++) {
2948 /* Time to delete the file too */
2949 object =
2950 yaffs_FindObjectByNumber(dev,
2951 dev->gcCleanupList[i]);
2952 if (object) {
2953 yaffs_FreeTnode(dev,
2954 object->variant.fileVariant.
2955 top);
2956 object->variant.fileVariant.top = NULL;
2957 T(YAFFS_TRACE_GC,
2958 (TSTR
2959 ("yaffs: About to finally delete object %d"
2960 TENDSTR), object->objectId));
2961 yaffs_DoGenericObjectDeletion(object);
2962 object->myDev->nDeletedFiles--;
2963 }
2964
2965 }
2966
2967 }
2968
2969 yaffs_VerifyCollectedBlock(dev,bi,block);
4b070809 2970
0e8cc8bd
WJ		 2971 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
2972 T(YAFFS_TRACE_GC,
2973 (TSTR
2974 ("gc did not increase free chunks before %d after %d"
2975 TENDSTR), chunksBefore, chunksAfter));
2976 }
2977
2978 dev->isDoingGC = 0;
2979
2980 return YAFFS_OK;
2981}
2982
2983/* New garbage collector
2984 * If we're very low on erased blocks then we do aggressive garbage collection
2985 * otherwise we do "leasurely" garbage collection.
2986 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2987 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2988 *
2989 * The idea is to help clear out space in a more spread-out manner.
2990 * Dunno if it really does anything useful.
2991 */
2992static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
2993{
2994 int block;
2995 int aggressive;
2996 int gcOk = YAFFS_OK;
2997 int maxTries = 0;
4b070809 2998
0e8cc8bd
WJ		 2999 int checkpointBlockAdjust;
3000
3001 if (dev->isDoingGC) {
3002 /* Bail out so we don't get recursive gc */
3003 return YAFFS_OK;
3004 }
4b070809 3005
0e8cc8bd
WJ		 3006 /* This loop should pass the first time.
3007 * We'll only see looping here if the erase of the collected block fails.
3008 */
3009
3010 do {
3011 maxTries++;
4b070809 3012
0e8cc8bd
WJ		 3013 checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
3014 if(checkpointBlockAdjust < 0)
3015 checkpointBlockAdjust = 0;
3016
3017 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3018 /* We need a block soon...*/
3019 aggressive = 1;
3020 } else {
3021 /* We're in no hurry */
3022 aggressive = 0;
3023 }
3024
3025 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3026
3027 if (block > 0) {
3028 dev->garbageCollections++;
3029 if (!aggressive) {
3030 dev->passiveGarbageCollections++;
3031 }
3032
3033 T(YAFFS_TRACE_GC,
3034 (TSTR
3035 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3036 dev->nErasedBlocks, aggressive));
3037
3038 gcOk = yaffs_GarbageCollectBlock(dev, block);
3039 }
3040
3041 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3042 T(YAFFS_TRACE_GC,
3043 (TSTR
3044 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3045 TENDSTR), dev->nErasedBlocks, maxTries, block));
3046 }
3047 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
3048 && (maxTries < 2));
3049
3050 return aggressive ? gcOk : YAFFS_OK;
3051}
3052
3053/*------------------------- TAGS --------------------------------*/
3054
3055static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
3056 int chunkInObject)
3057{
3058 return (tags->chunkId == chunkInObject &&
3059 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3060
3061}
3062
3063
3064/*-------------------- Data file manipulation -----------------*/
3065
3066static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
3067 yaffs_ExtendedTags * tags)
3068{
3069 /*Get the Tnode, then get the level 0 offset chunk offset */
3070 yaffs_Tnode *tn;
3071 int theChunk = -1;
3072 yaffs_ExtendedTags localTags;
3073 int retVal = -1;
3074
3075 yaffs_Device *dev = in->myDev;
3076
3077 if (!tags) {
3078 /* Passed a NULL, so use our own tags space */
3079 tags = &localTags;
3080 }
3081
3082 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3083
3084 if (tn) {
3085 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3086
3087 retVal =
3088 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3089 chunkInInode);
3090 }
3091 return retVal;
3092}
3093
3094static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
3095 yaffs_ExtendedTags * tags)
3096{
3097 /* Get the Tnode, then get the level 0 offset chunk offset */
3098 yaffs_Tnode *tn;
3099 int theChunk = -1;
3100 yaffs_ExtendedTags localTags;
3101
3102 yaffs_Device *dev = in->myDev;
3103 int retVal = -1;
3104
3105 if (!tags) {
3106 /* Passed a NULL, so use our own tags space */
3107 tags = &localTags;
3108 }
3109
3110 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3111
3112 if (tn) {
3113
3114 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3115
3116 retVal =
3117 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3118 chunkInInode);
3119
3120 /* Delete the entry in the filestructure (if found) */
3121 if (retVal != -1) {
3122 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
3123 }
3124 } else {
3125 /*T(("No level 0 found for %d\n", chunkInInode)); */
3126 }
3127
3128 if (retVal == -1) {
3129 /* T(("Could not find %d to delete\n",chunkInInode)); */
3130 }
3131 return retVal;
3132}
3133
3134#ifdef YAFFS_PARANOID
3135
3136static int yaffs_CheckFileSanity(yaffs_Object * in)
3137{
3138 int chunk;
3139 int nChunks;
3140 int fSize;
3141 int failed = 0;
3142 int objId;
3143 yaffs_Tnode *tn;
3144 yaffs_Tags localTags;
3145 yaffs_Tags *tags = &localTags;
3146 int theChunk;
3147 int chunkDeleted;
3148
3149 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3150 /* T(("Object not a file\n")); */
3151 return YAFFS_FAIL;
3152 }
3153
3154 objId = in->objectId;
3155 fSize = in->variant.fileVariant.fileSize;
3156 nChunks =
3157 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3158
3159 for (chunk = 1; chunk <= nChunks; chunk++) {
3160 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3161 chunk);
3162
3163 if (tn) {
3164
3165 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
3166
3167 if (yaffs_CheckChunkBits
3168 (dev, theChunk / dev->nChunksPerBlock,
3169 theChunk % dev->nChunksPerBlock)) {
3170
3171 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3172 tags,
3173 &chunkDeleted);
3174 if (yaffs_TagsMatch
3175 (tags, in->objectId, chunk, chunkDeleted)) {
3176 /* found it; */
3177
3178 }
3179 } else {
3180
3181 failed = 1;
3182 }
3183
3184 } else {
3185 /* T(("No level 0 found for %d\n", chunk)); */
3186 }
3187 }
3188
3189 return failed ? YAFFS_FAIL : YAFFS_OK;
3190}
3191
3192#endif
3193
3194static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
3195 int chunkInNAND, int inScan)
3196{
4b070809
WD		 3197 /* NB inScan is zero unless scanning.
3198 * For forward scanning, inScan is > 0;
0e8cc8bd
WJ		 3199 * for backward scanning inScan is < 0
3200 */
4b070809 3201
0e8cc8bd
WJ		 3202 yaffs_Tnode *tn;
3203 yaffs_Device *dev = in->myDev;
3204 int existingChunk;
3205 yaffs_ExtendedTags existingTags;
3206 yaffs_ExtendedTags newTags;
3207 unsigned existingSerial, newSerial;
3208
3209 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3210 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3211 * If it is not during Scanning then something went wrong!
3212 */
3213 if (!inScan) {
3214 T(YAFFS_TRACE_ERROR,
3215 (TSTR
3216 ("yaffs tragedy:attempt to put data chunk into a non-file"
3217 TENDSTR)));
3218 YBUG();
3219 }
3220
3221 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3222 return YAFFS_OK;
3223 }
3224
4b070809 3225 tn = yaffs_AddOrFindLevel0Tnode(dev,
0e8cc8bd
WJ		 3226 &in->variant.fileVariant,
3227 chunkInInode,
3228 NULL);
3229 if (!tn) {
3230 return YAFFS_FAIL;
3231 }
3232
3233 existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3234
3235 if (inScan != 0) {
3236 /* If we're scanning then we need to test for duplicates
4b070809 3237 * NB This does not need to be efficient since it should only ever
0e8cc8bd
WJ		 3238 * happen when the power fails during a write, then only one
3239 * chunk should ever be affected.
3240 *
3241 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3242 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3243 */
3244
3245 if (existingChunk != 0) {
3246 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3247 * thus we have to do a FindChunkInFile to get the real chunk id.
3248 *
3249 * We have a duplicate now we need to decide which one to use:
3250 *
3251 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3252 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3253 * YAFFS1: Get both sets of tags and compare serial numbers.
3254 */
3255
3256 if (inScan > 0) {
3257 /* Only do this for forward scanning */
3258 yaffs_ReadChunkWithTagsFromNAND(dev,
3259 chunkInNAND,
3260 NULL, &newTags);
3261
3262 /* Do a proper find */
3263 existingChunk =
3264 yaffs_FindChunkInFile(in, chunkInInode,
3265 &existingTags);
3266 }
3267
3268 if (existingChunk <= 0) {
3269 /*Hoosterman - how did this happen? */
3270
3271 T(YAFFS_TRACE_ERROR,
3272 (TSTR
3273 ("yaffs tragedy: existing chunk < 0 in scan"
3274 TENDSTR)));
3275
3276 }
3277
4b070809 3278 /* NB The deleted flags should be false, otherwise the chunks will
0e8cc8bd
WJ		 3279 * not be loaded during a scan
3280 */
3281
3282 newSerial = newTags.serialNumber;
3283 existingSerial = existingTags.serialNumber;
3284
3285 if ((inScan > 0) &&
3286 (in->myDev->isYaffs2 ||
3287 existingChunk <= 0 ||
3288 ((existingSerial + 1) & 3) == newSerial)) {
4b070809 3289 /* Forward scanning.
0e8cc8bd
WJ		 3290 * Use new
3291 * Delete the old one and drop through to update the tnode
3292 */
3293 yaffs_DeleteChunk(dev, existingChunk, 1,
3294 __LINE__);
3295 } else {
3296 /* Backward scanning or we want to use the existing one
3297 * Use existing.
3298 * Delete the new one and return early so that the tnode isn't changed
3299 */
3300 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3301 __LINE__);
3302 return YAFFS_OK;
3303 }
3304 }
3305
3306 }
3307
3308 if (existingChunk == 0) {
3309 in->nDataChunks++;
3310 }
3311
3312 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
3313
3314 return YAFFS_OK;
3315}
3316
3317static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
3318 __u8 * buffer)
3319{
3320 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3321
3322 if (chunkInNAND >= 0) {
3323 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3324 buffer,NULL);
3325 } else {
3326 T(YAFFS_TRACE_NANDACCESS,
3327 (TSTR("Chunk %d not found zero instead" TENDSTR),
3328 chunkInNAND));
3329 /* get sane (zero) data if you read a hole */
4b070809 3330 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
0e8cc8bd
WJ		 3331 return 0;
3332 }
3333
3334}
3335
3336void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
3337{
3338 int block;
3339 int page;
3340 yaffs_ExtendedTags tags;
3341 yaffs_BlockInfo *bi;
3342
3343 if (chunkId <= 0)
3344 return;
4b070809 3345
0e8cc8bd
WJ		 3346
3347 dev->nDeletions++;
3348 block = chunkId / dev->nChunksPerBlock;
3349 page = chunkId % dev->nChunksPerBlock;
3350
3351
3352 if(!yaffs_CheckChunkBit(dev,block,page))
3353 T(YAFFS_TRACE_VERIFY,
4b070809
WD		 3354 (TSTR("Deleting invalid chunk %d"TENDSTR),
3355 chunkId));
0e8cc8bd
WJ		 3356
3357 bi = yaffs_GetBlockInfo(dev, block);
3358
3359 T(YAFFS_TRACE_DELETION,
3360 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3361
3362 if (markNAND &&
3363 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3364
3365 yaffs_InitialiseTags(&tags);
3366
3367 tags.chunkDeleted = 1;
3368
3369 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3370 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3371 } else {
3372 dev->nUnmarkedDeletions++;
3373 }
3374
3375 /* Pull out of the management area.
3376 * If the whole block became dirty, this will kick off an erasure.
3377 */
3378 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3379 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3380 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3381 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3382 dev->nFreeChunks++;
3383
3384 yaffs_ClearChunkBit(dev, block, page);
3385
3386 bi->pagesInUse--;
3387
3388 if (bi->pagesInUse == 0 &&
3389 !bi->hasShrinkHeader &&
3390 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3391 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3392 yaffs_BlockBecameDirty(dev, block);
3393 }
3394
3395 } else {
3396 /* T(("Bad news deleting chunk %d\n",chunkId)); */
3397 }
3398
3399}
3400
3401static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
3402 const __u8 * buffer, int nBytes,
3403 int useReserve)
3404{
3405 /* Find old chunk Need to do this to get serial number
3406 * Write new one and patch into tree.
3407 * Invalidate old tags.
3408 */
3409
3410 int prevChunkId;
3411 yaffs_ExtendedTags prevTags;
3412
3413 int newChunkId;
3414 yaffs_ExtendedTags newTags;
3415
3416 yaffs_Device *dev = in->myDev;
3417
3418 yaffs_CheckGarbageCollection(dev);
3419
3420 /* Get the previous chunk at this location in the file if it exists */
3421 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3422
3423 /* Set up new tags */
3424 yaffs_InitialiseTags(&newTags);
3425
3426 newTags.chunkId = chunkInInode;
3427 newTags.objectId = in->objectId;
3428 newTags.serialNumber =
3429 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3430 newTags.byteCount = nBytes;
3431
3432 newChunkId =
3433 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3434 useReserve);
3435
3436 if (newChunkId >= 0) {
3437 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3438
3439 if (prevChunkId >= 0) {
3440 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3441
3442 }
3443
3444 yaffs_CheckFileSanity(in);
3445 }
3446 return newChunkId;
3447
3448}
3449
3450/* UpdateObjectHeader updates the header on NAND for an object.
3451 * If name is not NULL, then that new name is used.
3452 */
3453int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
3454 int isShrink, int shadows)
3455{
3456
3457 yaffs_BlockInfo *bi;
3458
3459 yaffs_Device *dev = in->myDev;
3460
3461 int prevChunkId;
3462 int retVal = 0;
3463 int result = 0;
3464
3465 int newChunkId;
3466 yaffs_ExtendedTags newTags;
3467 yaffs_ExtendedTags oldTags;
3468
3469 __u8 *buffer = NULL;
3470 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3471
3472 yaffs_ObjectHeader *oh = NULL;
4b070809 3473
0e8cc8bd
WJ		 3474 yaffs_strcpy(oldName,"silly old name");
3475
3476 if (!in->fake || force) {
3477
3478 yaffs_CheckGarbageCollection(dev);
3479 yaffs_CheckObjectDetailsLoaded(in);
3480
3481 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3482 oh = (yaffs_ObjectHeader *) buffer;
3483
3484 prevChunkId = in->chunkId;
3485
3486 if (prevChunkId >= 0) {
3487 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3488 buffer, &oldTags);
4b070809 3489
0e8cc8bd 3490 yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
4b070809 3491
0e8cc8bd
WJ		 3492 memcpy(oldName, oh->name, sizeof(oh->name));
3493 }
3494
3495 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3496
3497 oh->type = in->variantType;
3498 oh->yst_mode = in->yst_mode;
3499 oh->shadowsObject = shadows;
3500
3501#ifdef CONFIG_YAFFS_WINCE
3502 oh->win_atime[0] = in->win_atime[0];
3503 oh->win_ctime[0] = in->win_ctime[0];
3504 oh->win_mtime[0] = in->win_mtime[0];
3505 oh->win_atime[1] = in->win_atime[1];
3506 oh->win_ctime[1] = in->win_ctime[1];
3507 oh->win_mtime[1] = in->win_mtime[1];
3508#else
3509 oh->yst_uid = in->yst_uid;
3510 oh->yst_gid = in->yst_gid;
3511 oh->yst_atime = in->yst_atime;
3512 oh->yst_mtime = in->yst_mtime;
3513 oh->yst_ctime = in->yst_ctime;
3514 oh->yst_rdev = in->yst_rdev;
3515#endif
3516 if (in->parent) {
3517 oh->parentObjectId = in->parent->objectId;
3518 } else {
3519 oh->parentObjectId = 0;
3520 }
3521
3522 if (name && *name) {
3523 memset(oh->name, 0, sizeof(oh->name));
3524 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3525 } else if (prevChunkId>=0) {
3526 memcpy(oh->name, oldName, sizeof(oh->name));
3527 } else {
3528 memset(oh->name, 0, sizeof(oh->name));
3529 }
3530
3531 oh->isShrink = isShrink;
3532
3533 switch (in->variantType) {
3534 case YAFFS_OBJECT_TYPE_UNKNOWN:
3535 /* Should not happen */
3536 break;
3537 case YAFFS_OBJECT_TYPE_FILE:
3538 oh->fileSize =
3539 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3540 || oh->parentObjectId ==
3541 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3542 fileVariant.fileSize;
3543 break;
3544 case YAFFS_OBJECT_TYPE_HARDLINK:
3545 oh->equivalentObjectId =
3546 in->variant.hardLinkVariant.equivalentObjectId;
3547 break;
3548 case YAFFS_OBJECT_TYPE_SPECIAL:
3549 /* Do nothing */
3550 break;
3551 case YAFFS_OBJECT_TYPE_DIRECTORY:
3552 /* Do nothing */
3553 break;
3554 case YAFFS_OBJECT_TYPE_SYMLINK:
3555 yaffs_strncpy(oh->alias,
3556 in->variant.symLinkVariant.alias,
3557 YAFFS_MAX_ALIAS_LENGTH);
3558 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3559 break;
3560 }
3561
3562 /* Tags */
3563 yaffs_InitialiseTags(&newTags);
3564 in->serial++;
3565 newTags.chunkId = 0;
3566 newTags.objectId = in->objectId;
3567 newTags.serialNumber = in->serial;
3568
3569 /* Add extra info for file header */
3570
3571 newTags.extraHeaderInfoAvailable = 1;
3572 newTags.extraParentObjectId = oh->parentObjectId;
3573 newTags.extraFileLength = oh->fileSize;
3574 newTags.extraIsShrinkHeader = oh->isShrink;
3575 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3576 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3577 newTags.extraObjectType = in->variantType;
3578
3579 yaffs_VerifyObjectHeader(in,oh,&newTags,1);
3580
3581 /* Create new chunk in NAND */
3582 newChunkId =
3583 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3584 (prevChunkId >= 0) ? 1 : 0);
3585
3586 if (newChunkId >= 0) {
3587
3588 in->chunkId = newChunkId;
3589
3590 if (prevChunkId >= 0) {
3591 yaffs_DeleteChunk(dev, prevChunkId, 1,
3592 __LINE__);
3593 }
3594
3595 if(!yaffs_ObjectHasCachedWriteData(in))
3596 in->dirty = 0;
3597
3598 /* If this was a shrink, then mark the block that the chunk lives on */
3599 if (isShrink) {
3600 bi = yaffs_GetBlockInfo(in->myDev,
3601 newChunkId /in->myDev-> nChunksPerBlock);
3602 bi->hasShrinkHeader = 1;
3603 }
3604
3605 }
3606
3607 retVal = newChunkId;
3608
3609 }
3610
3611 if (buffer)
3612 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3613
3614 return retVal;
3615}
3616
3617/*------------------------ Short Operations Cache ----------------------------------------
3618 * In many situations where there is no high level buffering (eg WinCE) a lot of
4b070809 3619 * reads might be short sequential reads, and a lot of writes may be short
0e8cc8bd 3620 * sequential writes. eg. scanning/writing a jpeg file.
4b070809 3621 * In these cases, a short read/write cache can provide a huge perfomance benefit
0e8cc8bd 3622 * with dumb-as-a-rock code.
4b070809 3623 * In Linux, the page cache provides read buffering aand the short op cache provides write
0e8cc8bd
WJ		 3624 * buffering.
3625 *
3626 * There are a limited number (~10) of cache chunks per device so that we don't
3627 * need a very intelligent search.
3628 */
3629
3630static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3631{
3632 yaffs_Device *dev = obj->myDev;
3633 int i;
3634 yaffs_ChunkCache *cache;
3635 int nCaches = obj->myDev->nShortOpCaches;
4b070809 3636
0e8cc8bd
WJ		 3637 for(i = 0; i < nCaches; i++){
3638 cache = &dev->srCache[i];
3639 if (cache->object == obj &&
3640 cache->dirty)
3641 return 1;
3642 }
4b070809 3643
0e8cc8bd
WJ		 3644 return 0;
3645}
3646
3647
3648static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
3649{
3650 yaffs_Device *dev = obj->myDev;
3651 int lowest = -99; /* Stop compiler whining. */
3652 int i;
3653 yaffs_ChunkCache *cache;
3654 int chunkWritten = 0;
3655 int nCaches = obj->myDev->nShortOpCaches;
3656
3657 if (nCaches > 0) {
3658 do {
3659 cache = NULL;
3660
3661 /* Find the dirty cache for this object with the lowest chunk id. */
3662 for (i = 0; i < nCaches; i++) {
3663 if (dev->srCache[i].object == obj &&
3664 dev->srCache[i].dirty) {
3665 if (!cache
3666 || dev->srCache[i].chunkId <
3667 lowest) {
3668 cache = &dev->srCache[i];
3669 lowest = cache->chunkId;
3670 }
3671 }
3672 }
3673
3674 if (cache && !cache->locked) {
3675 /* Write it out and free it up */
3676
3677 chunkWritten =
3678 yaffs_WriteChunkDataToObject(cache->object,
3679 cache->chunkId,
3680 cache->data,
3681 cache->nBytes,
3682 1);
3683 cache->dirty = 0;
3684 cache->object = NULL;
3685 }
3686
3687 } while (cache && chunkWritten > 0);
3688
3689 if (cache) {
3690 /* Hoosterman, disk full while writing cache out. */
3691 T(YAFFS_TRACE_ERROR,
3692 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3693
3694 }
3695 }
3696
3697}
3698
3699/*yaffs_FlushEntireDeviceCache(dev)
3700 *
3701 *
3702 */
3703
3704void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3705{
3706 yaffs_Object *obj;
3707 int nCaches = dev->nShortOpCaches;
3708 int i;
4b070809 3709
0e8cc8bd
WJ		 3710 /* Find a dirty object in the cache and flush it...
3711 * until there are no further dirty objects.
3712 */
3713 do {
3714 obj = NULL;
3715 for( i = 0; i < nCaches && !obj; i++) {
3716 if (dev->srCache[i].object &&
3717 dev->srCache[i].dirty)
3718 obj = dev->srCache[i].object;
4b070809 3719
0e8cc8bd
WJ		 3720 }
3721 if(obj)
3722 yaffs_FlushFilesChunkCache(obj);
4b070809 3723
0e8cc8bd 3724 } while(obj);
4b070809 3725
0e8cc8bd
WJ		 3726}
3727
3728
3729/* Grab us a cache chunk for use.
4b070809 3730 * First look for an empty one.
0e8cc8bd
WJ		 3731 * Then look for the least recently used non-dirty one.
3732 * Then look for the least recently used dirty one...., flush and look again.
3733 */
3734static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3735{
3736 int i;
3737 int usage;
3738 int theOne;
3739
3740 if (dev->nShortOpCaches > 0) {
3741 for (i = 0; i < dev->nShortOpCaches; i++) {
4b070809 3742 if (!dev->srCache[i].object)
0e8cc8bd
WJ		 3743 return &dev->srCache[i];
3744 }
3745
3746 return NULL;
3747
3748 theOne = -1;
3749 usage = 0; /* just to stop the compiler grizzling */
3750
3751 for (i = 0; i < dev->nShortOpCaches; i++) {
3752 if (!dev->srCache[i].dirty &&
3753 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3754 theOne < 0)) {
3755 usage = dev->srCache[i].lastUse;
3756 theOne = i;
3757 }
3758 }
3759
3760
3761 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3762 } else {
3763 return NULL;
3764 }
3765
3766}
3767
3768static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3769{
3770 yaffs_ChunkCache *cache;
3771 yaffs_Object *theObj;
3772 int usage;
3773 int i;
3774 int pushout;
3775
3776 if (dev->nShortOpCaches > 0) {
3777 /* Try find a non-dirty one... */
3778
3779 cache = yaffs_GrabChunkCacheWorker(dev);
3780
3781 if (!cache) {
3782 /* They were all dirty, find the last recently used object and flush
3783 * its cache, then find again.
3784 * NB what's here is not very accurate, we actually flush the object
3785 * the last recently used page.
3786 */
3787
3788 /* With locking we can't assume we can use entry zero */
3789
3790 theObj = NULL;
3791 usage = -1;
3792 cache = NULL;
3793 pushout = -1;
3794
3795 for (i = 0; i < dev->nShortOpCaches; i++) {
3796 if (dev->srCache[i].object &&
3797 !dev->srCache[i].locked &&
3798 (dev->srCache[i].lastUse < usage || !cache))
3799 {
3800 usage = dev->srCache[i].lastUse;
3801 theObj = dev->srCache[i].object;
3802 cache = &dev->srCache[i];
3803 pushout = i;
3804 }
3805 }
3806
3807 if (!cache || cache->dirty) {
3808 /* Flush and try again */
3809 yaffs_FlushFilesChunkCache(theObj);
3810 cache = yaffs_GrabChunkCacheWorker(dev);
3811 }
3812
3813 }
3814 return cache;
3815 } else
3816 return NULL;
3817
3818}
3819
3820/* Find a cached chunk */
3821static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3822 int chunkId)
3823{
3824 yaffs_Device *dev = obj->myDev;
3825 int i;
3826 if (dev->nShortOpCaches > 0) {
3827 for (i = 0; i < dev->nShortOpCaches; i++) {
3828 if (dev->srCache[i].object == obj &&
3829 dev->srCache[i].chunkId == chunkId) {
3830 dev->cacheHits++;
3831
3832 return &dev->srCache[i];
3833 }
3834 }
3835 }
3836 return NULL;
3837}
3838
3839/* Mark the chunk for the least recently used algorithym */
3840static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3841 int isAWrite)
3842{
3843
3844 if (dev->nShortOpCaches > 0) {
3845 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3846 /* Reset the cache usages */
3847 int i;
3848 for (i = 1; i < dev->nShortOpCaches; i++) {
3849 dev->srCache[i].lastUse = 0;
3850 }
3851 dev->srLastUse = 0;
3852 }
3853
3854 dev->srLastUse++;
3855
3856 cache->lastUse = dev->srLastUse;
3857
3858 if (isAWrite) {
3859 cache->dirty = 1;
3860 }
3861 }
3862}
3863
3864/* Invalidate a single cache page.
3865 * Do this when a whole page gets written,
3866 * ie the short cache for this page is no longer valid.
3867 */
3868static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
3869{
3870 if (object->myDev->nShortOpCaches > 0) {
3871 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3872
3873 if (cache) {
3874 cache->object = NULL;
3875 }
3876 }
3877}
3878
3879/* Invalidate all the cache pages associated with this object
3880 * Do this whenever ther file is deleted or resized.
3881 */
3882static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
3883{
3884 int i;
3885 yaffs_Device *dev = in->myDev;
3886
3887 if (dev->nShortOpCaches > 0) {
3888 /* Invalidate it. */
3889 for (i = 0; i < dev->nShortOpCaches; i++) {
3890 if (dev->srCache[i].object == in) {
3891 dev->srCache[i].object = NULL;
3892 }
3893 }
3894 }
3895}
3896
3897/*--------------------- Checkpointing --------------------*/
3898
3899
3900static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
3901{
3902 yaffs_CheckpointValidity cp;
4b070809 3903
0e8cc8bd 3904 memset(&cp,0,sizeof(cp));
4b070809 3905
0e8cc8bd
WJ		 3906 cp.structType = sizeof(cp);
3907 cp.magic = YAFFS_MAGIC;
3908 cp.version = YAFFS_CHECKPOINT_VERSION;
3909 cp.head = (head) ? 1 : 0;
4b070809 3910
0e8cc8bd
WJ		 3911 return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
3912 1 : 0;
3913}
3914
3915static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
3916{
3917 yaffs_CheckpointValidity cp;
3918 int ok;
4b070809 3919
0e8cc8bd 3920 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4b070809 3921
0e8cc8bd
WJ		 3922 if(ok)
3923 ok = (cp.structType == sizeof(cp)) &&
3924 (cp.magic == YAFFS_MAGIC) &&
3925 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
3926 (cp.head == ((head) ? 1 : 0));
3927 return ok ? 1 : 0;
3928}
3929
4b070809 3930static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
0e8cc8bd
WJ		 3931 yaffs_Device *dev)
3932{
3933 cp->nErasedBlocks = dev->nErasedBlocks;
3934 cp->allocationBlock = dev->allocationBlock;
3935 cp->allocationPage = dev->allocationPage;
3936 cp->nFreeChunks = dev->nFreeChunks;
4b070809 3937
0e8cc8bd
WJ		 3938 cp->nDeletedFiles = dev->nDeletedFiles;
3939 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
3940 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
3941 cp->sequenceNumber = dev->sequenceNumber;
3942 cp->oldestDirtySequence = dev->oldestDirtySequence;
4b070809 3943
0e8cc8bd
WJ		 3944}
3945
3946static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
3947 yaffs_CheckpointDevice *cp)
3948{
3949 dev->nErasedBlocks = cp->nErasedBlocks;
3950 dev->allocationBlock = cp->allocationBlock;
3951 dev->allocationPage = cp->allocationPage;
3952 dev->nFreeChunks = cp->nFreeChunks;
4b070809 3953
0e8cc8bd
WJ		 3954 dev->nDeletedFiles = cp->nDeletedFiles;
3955 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
3956 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
3957 dev->sequenceNumber = cp->sequenceNumber;
3958 dev->oldestDirtySequence = cp->oldestDirtySequence;
3959}
3960
3961
3962static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
3963{
3964 yaffs_CheckpointDevice cp;
3965 __u32 nBytes;
3966 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3967
3968 int ok;
4b070809 3969
0e8cc8bd
WJ		 3970 /* Write device runtime values*/
3971 yaffs_DeviceToCheckpointDevice(&cp,dev);
3972 cp.structType = sizeof(cp);
4b070809 3973
0e8cc8bd 3974 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4b070809 3975
0e8cc8bd
WJ		 3976 /* Write block info */
3977 if(ok) {
3978 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3979 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
3980 }
4b070809
WD		 3981
3982 /* Write chunk bits */
0e8cc8bd
WJ		 3983 if(ok) {
3984 nBytes = nBlocks * dev->chunkBitmapStride;
3985 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
3986 }
3987 return ok ? 1 : 0;
3988
3989}
3990
3991static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
3992{
3993 yaffs_CheckpointDevice cp;
3994 __u32 nBytes;
3995 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3996
4b070809
WD		 3997 int ok;
3998
0e8cc8bd
WJ		 3999 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4000 if(!ok)
4001 return 0;
4b070809 4002
0e8cc8bd
WJ		 4003 if(cp.structType != sizeof(cp))
4004 return 0;
4b070809
WD		 4005
4006
0e8cc8bd 4007 yaffs_CheckpointDeviceToDevice(dev,&cp);
4b070809 4008
0e8cc8bd 4009 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4b070809 4010
0e8cc8bd 4011 ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
4b070809 4012
0e8cc8bd
WJ		 4013 if(!ok)
4014 return 0;
4015 nBytes = nBlocks * dev->chunkBitmapStride;
4b070809 4016
0e8cc8bd 4017 ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
4b070809 4018
0e8cc8bd
WJ		 4019 return ok ? 1 : 0;
4020}
4021
4022static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4023 yaffs_Object *obj)
4024{
4025
4026 cp->objectId = obj->objectId;
4027 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4028 cp->chunkId = obj->chunkId;
4b070809 4029 cp->variantType = obj->variantType;
0e8cc8bd
WJ		 4030 cp->deleted = obj->deleted;
4031 cp->softDeleted = obj->softDeleted;
4032 cp->unlinked = obj->unlinked;
4033 cp->fake = obj->fake;
4034 cp->renameAllowed = obj->renameAllowed;
4035 cp->unlinkAllowed = obj->unlinkAllowed;
4036 cp->serial = obj->serial;
4037 cp->nDataChunks = obj->nDataChunks;
4b070809 4038
0e8cc8bd
WJ		 4039 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4040 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4041 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4042 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4043}
4044
4045static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
4046{
4047
4048 yaffs_Object *parent;
4b070809 4049
0e8cc8bd 4050 obj->objectId = cp->objectId;
4b070809 4051
0e8cc8bd
WJ		 4052 if(cp->parentId)
4053 parent = yaffs_FindOrCreateObjectByNumber(
4054 obj->myDev,
4055 cp->parentId,
4056 YAFFS_OBJECT_TYPE_DIRECTORY);
4057 else
4058 parent = NULL;
4b070809 4059
0e8cc8bd
WJ		 4060 if(parent)
4061 yaffs_AddObjectToDirectory(parent, obj);
4b070809 4062
0e8cc8bd 4063 obj->chunkId = cp->chunkId;
4b070809 4064 obj->variantType = cp->variantType;
0e8cc8bd
WJ		 4065 obj->deleted = cp->deleted;
4066 obj->softDeleted = cp->softDeleted;
4067 obj->unlinked = cp->unlinked;
4068 obj->fake = cp->fake;
4069 obj->renameAllowed = cp->renameAllowed;
4070 obj->unlinkAllowed = cp->unlinkAllowed;
4071 obj->serial = cp->serial;
4072 obj->nDataChunks = cp->nDataChunks;
4b070809 4073
0e8cc8bd
WJ		 4074 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4075 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4076 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4077 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4b070809 4078
0e8cc8bd
WJ		 4079 if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
4080 obj->lazyLoaded = 1;
4081}
4082
4083
4084
4085static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
4b070809 4086 __u32 level, int chunkOffset)
0e8cc8bd
WJ		 4087{
4088 int i;
4089 yaffs_Device *dev = in->myDev;
4090 int ok = 1;
4091 int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4092
4093 if (tn) {
4094 if (level > 0) {
4095
4096 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
4097 if (tn->internal[i]) {
4098 ok = yaffs_CheckpointTnodeWorker(in,
4099 tn->internal[i],
4100 level - 1,
4101 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4102 }
4103 }
4104 } else if (level == 0) {
4105 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4106 /* printf("write tnode at %d\n",baseOffset); */
4107 ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
4108 if(ok)
4109 ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
4110 }
4111 }
4112
4113 return ok;
4114
4115}
4116
4117static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4118{
4119 __u32 endMarker = ~0;
4120 int ok = 1;
4b070809 4121
0e8cc8bd
WJ		 4122 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4123 ok = yaffs_CheckpointTnodeWorker(obj,
4124 obj->variant.fileVariant.top,
4125 obj->variant.fileVariant.topLevel,
4126 0);
4127 if(ok)
4b070809 4128 ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
0e8cc8bd
WJ		 4129 sizeof(endMarker));
4130 }
4b070809 4131
0e8cc8bd
WJ		 4132 return ok ? 1 : 0;
4133}
4134
4135static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4136{
4137 __u32 baseChunk;
4138 int ok = 1;
4139 yaffs_Device *dev = obj->myDev;
4140 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4141 yaffs_Tnode *tn;
4142 int nread = 0;
4b070809 4143
0e8cc8bd 4144 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4b070809 4145
0e8cc8bd
WJ		 4146 while(ok && (~baseChunk)){
4147 nread++;
4148 /* Read level 0 tnode */
4b070809
WD		 4149
4150
0e8cc8bd
WJ		 4151 /* printf("read tnode at %d\n",baseChunk); */
4152 tn = yaffs_GetTnodeRaw(dev);
4153 if(tn)
4154 ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
4155 (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
4156 else
4157 ok = 0;
4b070809 4158
0e8cc8bd
WJ		 4159 if(tn && ok){
4160 ok = yaffs_AddOrFindLevel0Tnode(dev,
4b070809
WD		 4161 fileStructPtr,
4162 baseChunk,
4163 tn) ? 1 : 0;
4164
0e8cc8bd 4165 }
4b070809 4166
0e8cc8bd
WJ		 4167 if(ok)
4168 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4b070809 4169
0e8cc8bd
WJ		 4170 }
4171
4172 T(YAFFS_TRACE_CHECKPOINT,(
4173 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4174 nread,baseChunk,ok));
4175
4b070809 4176 return ok ? 1 : 0;
0e8cc8bd 4177}
4b070809 4178
0e8cc8bd
WJ		 4179
4180static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4181{
4182 yaffs_Object *obj;
4183 yaffs_CheckpointObject cp;
4184 int i;
4185 int ok = 1;
4186 struct list_head *lh;
4187
4b070809 4188
0e8cc8bd
WJ		 4189 /* Iterate through the objects in each hash entry,
4190 * dumping them to the checkpointing stream.
4191 */
4b070809 4192
0e8cc8bd 4193 for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
4b070809 4194 list_for_each(lh, &dev->objectBucket[i].list) {
0e8cc8bd
WJ		 4195 if (lh) {
4196 obj = list_entry(lh, yaffs_Object, hashLink);
4197 if (!obj->deferedFree) {
4198 yaffs_ObjectToCheckpointObject(&cp,obj);
4199 cp.structType = sizeof(cp);
4200
4201 T(YAFFS_TRACE_CHECKPOINT,(
4202 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4203 cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
4b070809 4204
0e8cc8bd 4205 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4b070809 4206
0e8cc8bd
WJ		 4207 if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4208 ok = yaffs_WriteCheckpointTnodes(obj);
4209 }
4210 }
4211 }
4212 }
4213 }
4b070809 4214
0e8cc8bd
WJ		 4215 /* Dump end of list */
4216 memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
4217 cp.structType = sizeof(cp);
4b070809 4218
0e8cc8bd
WJ		 4219 if(ok)
4220 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4b070809 4221
0e8cc8bd
WJ		 4222 return ok ? 1 : 0;
4223}
4224
4225static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4226{
4227 yaffs_Object *obj;
4228 yaffs_CheckpointObject cp;
4229 int ok = 1;
4230 int done = 0;
4231 yaffs_Object *hardList = NULL;
4b070809 4232
0e8cc8bd
WJ		 4233 while(ok && !done) {
4234 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4235 if(cp.structType != sizeof(cp)) {
4236 T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
4237 cp.structType,sizeof(cp),ok));
4238 ok = 0;
4239 }
4b070809 4240
0e8cc8bd
WJ		 4241 T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4242 cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
4b070809 4243
0e8cc8bd
WJ		 4244 if(ok && cp.objectId == ~0)
4245 done = 1;
4246 else if(ok){
4247 obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
4248 if(obj) {
4249 yaffs_CheckpointObjectToObject(obj,&cp);
4250 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4251 ok = yaffs_ReadCheckpointTnodes(obj);
4252 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4253 obj->hardLinks.next =
4254 (struct list_head *)
4255 hardList;
4256 hardList = obj;
4257 }
4b070809 4258
0e8cc8bd
WJ		 4259 }
4260 }
4261 }
4b070809 4262
0e8cc8bd
WJ		 4263 if(ok)
4264 yaffs_HardlinkFixup(dev,hardList);
4b070809 4265
0e8cc8bd
WJ		 4266 return ok ? 1 : 0;
4267}
4268
4269static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4270{
4271 __u32 checkpointSum;
4272 int ok;
4b070809 4273
0e8cc8bd 4274 yaffs_GetCheckpointSum(dev,&checkpointSum);
4b070809 4275
0e8cc8bd 4276 ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
4b070809 4277
0e8cc8bd
WJ		 4278 if(!ok)
4279 return 0;
4b070809 4280
0e8cc8bd
WJ		 4281 return 1;
4282}
4283
4284static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4285{
4286 __u32 checkpointSum0;
4287 __u32 checkpointSum1;
4288 int ok;
4b070809 4289
0e8cc8bd 4290 yaffs_GetCheckpointSum(dev,&checkpointSum0);
4b070809 4291
0e8cc8bd 4292 ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4b070809 4293
0e8cc8bd
WJ		 4294 if(!ok)
4295 return 0;
4b070809 4296
0e8cc8bd
WJ		 4297 if(checkpointSum0 != checkpointSum1)
4298 return 0;
4b070809 4299
0e8cc8bd
WJ		 4300 return 1;
4301}
4302
4303
4304static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4305{
4306
4307 int ok = 1;
4b070809 4308
0e8cc8bd
WJ		 4309 if(dev->skipCheckpointWrite || !dev->isYaffs2){
4310 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
4311 ok = 0;
4312 }
4b070809 4313
0e8cc8bd
WJ		 4314 if(ok)
4315 ok = yaffs_CheckpointOpen(dev,1);
4b070809 4316
0e8cc8bd
WJ		 4317 if(ok){
4318 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4319 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
4320 }
4321 if(ok){
4322 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
4323 ok = yaffs_WriteCheckpointDevice(dev);
4324 }
4325 if(ok){
4326 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
4327 ok = yaffs_WriteCheckpointObjects(dev);
4328 }
4329 if(ok){
4330 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4331 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
4332 }
4b070809 4333
0e8cc8bd
WJ		 4334 if(ok){
4335 ok = yaffs_WriteCheckpointSum(dev);
4336 }
4b070809
WD		 4337
4338
0e8cc8bd
WJ		 4339 if(!yaffs_CheckpointClose(dev))
4340 ok = 0;
4b070809 4341
0e8cc8bd 4342 if(ok)
4b070809
WD		 4343 dev->isCheckpointed = 1;
4344 else
4345 dev->isCheckpointed = 0;
0e8cc8bd
WJ		 4346
4347 return dev->isCheckpointed;
4348}
4349
4350static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4351{
4352 int ok = 1;
4b070809 4353
0e8cc8bd
WJ		 4354 if(dev->skipCheckpointRead || !dev->isYaffs2){
4355 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
4356 ok = 0;
4357 }
4b070809 4358
0e8cc8bd
WJ		 4359 if(ok)
4360 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
4b070809 4361
0e8cc8bd 4362 if(ok){
4b070809 4363 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
0e8cc8bd
WJ		 4364 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
4365 }
4366 if(ok){
4367 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
4368 ok = yaffs_ReadCheckpointDevice(dev);
4369 }
4370 if(ok){
4b070809 4371 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
0e8cc8bd
WJ		 4372 ok = yaffs_ReadCheckpointObjects(dev);
4373 }
4374 if(ok){
4375 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4376 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
4377 }
4b070809 4378
0e8cc8bd
WJ		 4379 if(ok){
4380 ok = yaffs_ReadCheckpointSum(dev);
4381 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
4382 }
4383
4384 if(!yaffs_CheckpointClose(dev))
4385 ok = 0;
4386
4387 if(ok)
4b070809
WD		 4388 dev->isCheckpointed = 1;
4389 else
4390 dev->isCheckpointed = 0;
0e8cc8bd
WJ		 4391
4392 return ok ? 1 : 0;
4393
4394}
4395
4396static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4397{
4b070809 4398 if(dev->isCheckpointed ||
0e8cc8bd
WJ		 4399 dev->blocksInCheckpoint > 0){
4400 dev->isCheckpointed = 0;
4401 yaffs_CheckpointInvalidateStream(dev);
4402 if(dev->superBlock && dev->markSuperBlockDirty)
4403 dev->markSuperBlockDirty(dev->superBlock);
4404 }
4405}
4406
4407
4408int yaffs_CheckpointSave(yaffs_Device *dev)
4409{
4410
4411 T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4412
4413 yaffs_VerifyObjects(dev);
4414 yaffs_VerifyBlocks(dev);
4415 yaffs_VerifyFreeChunks(dev);
4416
4417 if(!dev->isCheckpointed) {
4418 yaffs_InvalidateCheckpoint(dev);
4419 yaffs_WriteCheckpointData(dev);
4420 }
4b070809 4421
0e8cc8bd
WJ		 4422 T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4423
4424 return dev->isCheckpointed;
4425}
4426
4427int yaffs_CheckpointRestore(yaffs_Device *dev)
4428{
4429 int retval;
4430 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4b070809 4431
0e8cc8bd
WJ		 4432 retval = yaffs_ReadCheckpointData(dev);
4433
4434 if(dev->isCheckpointed){
4435 yaffs_VerifyObjects(dev);
4436 yaffs_VerifyBlocks(dev);
4437 yaffs_VerifyFreeChunks(dev);
4438 }
4439
4440 T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4b070809 4441
0e8cc8bd
WJ		 4442 return retval;
4443}
4444
4445/*--------------------- File read/write ------------------------
4446 * Read and write have very similar structures.
4447 * In general the read/write has three parts to it
4448 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4449 * Some complete chunks
4450 * An incomplete chunk to end off with
4451 *
4452 * Curve-balls: the first chunk might also be the last chunk.
4453 */
4454
4455int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
4456 int nBytes)
4457{
4458
4754c823
MV		 4459 __u32 chunk = 0;
4460 __u32 start = 0;
0e8cc8bd
WJ		 4461 int nToCopy;
4462 int n = nBytes;
4463 int nDone = 0;
4464 yaffs_ChunkCache *cache;
4465
4466 yaffs_Device *dev;
4467
4468 dev = in->myDev;
4469
4470 while (n > 0) {
4471 //chunk = offset / dev->nDataBytesPerChunk + 1;
4472 //start = offset % dev->nDataBytesPerChunk;
4473 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4474 chunk++;
4475
4476 /* OK now check for the curveball where the start and end are in
4b070809 4477 * the same chunk.
0e8cc8bd
WJ		 4478 */
4479 if ((start + n) < dev->nDataBytesPerChunk) {
4480 nToCopy = n;
4481 } else {
4482 nToCopy = dev->nDataBytesPerChunk - start;
4483 }
4484
4485 cache = yaffs_FindChunkCache(in, chunk);
4486
4487 /* If the chunk is already in the cache or it is less than a whole chunk
4488 * then use the cache (if there is caching)
4489 * else bypass the cache.
4490 */
4491 if (cache || nToCopy != dev->nDataBytesPerChunk) {
4492 if (dev->nShortOpCaches > 0) {
4493
4494 /* If we can't find the data in the cache, then load it up. */
4495
4496 if (!cache) {
4497 cache = yaffs_GrabChunkCache(in->myDev);
4498 cache->object = in;
4499 cache->chunkId = chunk;
4500 cache->dirty = 0;
4501 cache->locked = 0;
4502 yaffs_ReadChunkDataFromObject(in, chunk,
4503 cache->
4504 data);
4505 cache->nBytes = 0;
4506 }
4507
4508 yaffs_UseChunkCache(dev, cache, 0);
4509
4510 cache->locked = 1;
4511
4512#ifdef CONFIG_YAFFS_WINCE
4513 yfsd_UnlockYAFFS(TRUE);
4514#endif
4515 memcpy(buffer, &cache->data[start], nToCopy);
4516
4517#ifdef CONFIG_YAFFS_WINCE
4518 yfsd_LockYAFFS(TRUE);
4519#endif
4520 cache->locked = 0;
4521 } else {
4522 /* Read into the local buffer then copy..*/
4523
4524 __u8 *localBuffer =
4525 yaffs_GetTempBuffer(dev, __LINE__);
4526 yaffs_ReadChunkDataFromObject(in, chunk,
4527 localBuffer);
4528#ifdef CONFIG_YAFFS_WINCE
4529 yfsd_UnlockYAFFS(TRUE);
4530#endif
4531 memcpy(buffer, &localBuffer[start], nToCopy);
4532
4533#ifdef CONFIG_YAFFS_WINCE
4534 yfsd_LockYAFFS(TRUE);
4535#endif
4536 yaffs_ReleaseTempBuffer(dev, localBuffer,
4537 __LINE__);
4538 }
4539
4540 } else {
4541#ifdef CONFIG_YAFFS_WINCE
4542 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4543
4544 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4545 * This is because we otherwise screw up WinCE's memory mapper
4546 */
4547 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
4548
4549#ifdef CONFIG_YAFFS_WINCE
4550 yfsd_UnlockYAFFS(TRUE);
4551#endif
4552 memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
4553
4554#ifdef CONFIG_YAFFS_WINCE
4555 yfsd_LockYAFFS(TRUE);
4556 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4557#endif
4558
4559#else
4560 /* A full chunk. Read directly into the supplied buffer. */
4561 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4562#endif
4563 }
4564
4565 n -= nToCopy;
4566 offset += nToCopy;
4567 buffer += nToCopy;
4568 nDone += nToCopy;
4569
4570 }
4571
4572 return nDone;
4573}
4574
4575int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
4576 int nBytes, int writeThrough)
4577{
4578
4754c823
MV		 4579 __u32 chunk = 0;
4580 __u32 start = 0;
0e8cc8bd
WJ		 4581 int nToCopy;
4582 int n = nBytes;
4583 int nDone = 0;
4584 int nToWriteBack;
4585 int startOfWrite = offset;
4586 int chunkWritten = 0;
4587 int nBytesRead;
4588
4589 yaffs_Device *dev;
4590
4591 dev = in->myDev;
4592
4593 while (n > 0 && chunkWritten >= 0) {
4594 //chunk = offset / dev->nDataBytesPerChunk + 1;
4595 //start = offset % dev->nDataBytesPerChunk;
4596 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4597 chunk++;
4598
4599 /* OK now check for the curveball where the start and end are in
4600 * the same chunk.
4601 */
4602
4603 if ((start + n) < dev->nDataBytesPerChunk) {
4604 nToCopy = n;
4605
4606 /* Now folks, to calculate how many bytes to write back....
4607 * If we're overwriting and not writing to then end of file then
4608 * we need to write back as much as was there before.
4609 */
4610
4611 nBytesRead =
4612 in->variant.fileVariant.fileSize -
4613 ((chunk - 1) * dev->nDataBytesPerChunk);
4614
4615 if (nBytesRead > dev->nDataBytesPerChunk) {
4616 nBytesRead = dev->nDataBytesPerChunk;
4617 }
4618
4619 nToWriteBack =
4620 (nBytesRead >
4621 (start + n)) ? nBytesRead : (start + n);
4622
4623 } else {
4624 nToCopy = dev->nDataBytesPerChunk - start;
4625 nToWriteBack = dev->nDataBytesPerChunk;
4626 }
4627
4628 if (nToCopy != dev->nDataBytesPerChunk) {
4629 /* An incomplete start or end chunk (or maybe both start and end chunk) */
4630 if (dev->nShortOpCaches > 0) {
4631 yaffs_ChunkCache *cache;
4632 /* If we can't find the data in the cache, then load the cache */
4633 cache = yaffs_FindChunkCache(in, chunk);
4b070809 4634
0e8cc8bd
WJ		 4635 if (!cache
4636 && yaffs_CheckSpaceForAllocation(in->
4637 myDev)) {
4638 cache = yaffs_GrabChunkCache(in->myDev);
4639 cache->object = in;
4640 cache->chunkId = chunk;
4641 cache->dirty = 0;
4642 cache->locked = 0;
4643 yaffs_ReadChunkDataFromObject(in, chunk,
4644 cache->
4645 data);
4646 }
4b070809
WD		 4647 else if(cache &&
4648 !cache->dirty &&
0e8cc8bd
WJ		 4649 !yaffs_CheckSpaceForAllocation(in->myDev)){
4650 /* Drop the cache if it was a read cache item and
4651 * no space check has been made for it.
4b070809 4652 */
0e8cc8bd
WJ		 4653 cache = NULL;
4654 }
4655
4656 if (cache) {
4657 yaffs_UseChunkCache(dev, cache, 1);
4658 cache->locked = 1;
4659#ifdef CONFIG_YAFFS_WINCE
4660 yfsd_UnlockYAFFS(TRUE);
4661#endif
4662
4663 memcpy(&cache->data[start], buffer,
4664 nToCopy);
4665
4666#ifdef CONFIG_YAFFS_WINCE
4667 yfsd_LockYAFFS(TRUE);
4668#endif
4669 cache->locked = 0;
4670 cache->nBytes = nToWriteBack;
4671
4672 if (writeThrough) {
4673 chunkWritten =
4674 yaffs_WriteChunkDataToObject
4675 (cache->object,
4676 cache->chunkId,
4677 cache->data, cache->nBytes,
4678 1);
4679 cache->dirty = 0;
4680 }
4681
4682 } else {
4683 chunkWritten = -1; /* fail the write */
4684 }
4685 } else {
4686 /* An incomplete start or end chunk (or maybe both start and end chunk)
4687 * Read into the local buffer then copy, then copy over and write back.
4688 */
4689
4690 __u8 *localBuffer =
4691 yaffs_GetTempBuffer(dev, __LINE__);
4692
4693 yaffs_ReadChunkDataFromObject(in, chunk,
4694 localBuffer);
4695
4696#ifdef CONFIG_YAFFS_WINCE
4697 yfsd_UnlockYAFFS(TRUE);
4698#endif
4699
4700 memcpy(&localBuffer[start], buffer, nToCopy);
4701
4702#ifdef CONFIG_YAFFS_WINCE
4703 yfsd_LockYAFFS(TRUE);
4704#endif
4705 chunkWritten =
4706 yaffs_WriteChunkDataToObject(in, chunk,
4707 localBuffer,
4708 nToWriteBack,
4709 0);
4710
4711 yaffs_ReleaseTempBuffer(dev, localBuffer,
4712 __LINE__);
4713
4714 }
4715
4716 } else {
4717
4718#ifdef CONFIG_YAFFS_WINCE
4719 /* Under WinCE can't do direct transfer. Need to use a local buffer.
4720 * This is because we otherwise screw up WinCE's memory mapper
4721 */
4722 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4723#ifdef CONFIG_YAFFS_WINCE
4724 yfsd_UnlockYAFFS(TRUE);
4725#endif
4726 memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
4727#ifdef CONFIG_YAFFS_WINCE
4728 yfsd_LockYAFFS(TRUE);
4729#endif
4730 chunkWritten =
4731 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
4732 dev->nDataBytesPerChunk,
4733 0);
4734 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4735#else
4736 /* A full chunk. Write directly from the supplied buffer. */
4737 chunkWritten =
4738 yaffs_WriteChunkDataToObject(in, chunk, buffer,
4739 dev->nDataBytesPerChunk,
4740 0);
4741#endif
4742 /* Since we've overwritten the cached data, we better invalidate it. */
4743 yaffs_InvalidateChunkCache(in, chunk);
4744 }
4745
4746 if (chunkWritten >= 0) {
4747 n -= nToCopy;
4748 offset += nToCopy;
4749 buffer += nToCopy;
4750 nDone += nToCopy;
4751 }
4752
4753 }
4754
4755 /* Update file object */
4756
4757 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
4758 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4759 }
4760
4761 in->dirty = 1;
4762
4763 return nDone;
4764}
4765
4766
4767/* ---------------------- File resizing stuff ------------------ */
4768
4769static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
4770{
4771
4772 yaffs_Device *dev = in->myDev;
4773 int oldFileSize = in->variant.fileVariant.fileSize;
4774
4775 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4776
4777 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4778 dev->nDataBytesPerChunk;
4779 int i;
4780 int chunkId;
4781
4782 /* Delete backwards so that we don't end up with holes if
4783 * power is lost part-way through the operation.
4784 */
4785 for (i = lastDel; i >= startDel; i--) {
4786 /* NB this could be optimised somewhat,
4787 * eg. could retrieve the tags and write them without
4788 * using yaffs_DeleteChunk
4789 */
4790
4791 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4792 if (chunkId > 0) {
4793 if (chunkId <
4794 (dev->internalStartBlock * dev->nChunksPerBlock)
4795 || chunkId >=
4796 ((dev->internalEndBlock +
4797 1) * dev->nChunksPerBlock)) {
4798 T(YAFFS_TRACE_ALWAYS,
4799 (TSTR("Found daft chunkId %d for %d" TENDSTR),
4800 chunkId, i));
4801 } else {
4802 in->nDataChunks--;
4803 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4804 }
4805 }
4806 }
4807
4808}
4809
4810int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
4811{
4812
4813 int oldFileSize = in->variant.fileVariant.fileSize;
4754c823
MV		 4814 __u32 newSizeOfPartialChunk = 0;
4815 __u32 newFullChunks = 0;
4b070809 4816
0e8cc8bd
WJ		 4817 yaffs_Device *dev = in->myDev;
4818
4819 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4820
4821 yaffs_FlushFilesChunkCache(in);
4822 yaffs_InvalidateWholeChunkCache(in);
4823
4824 yaffs_CheckGarbageCollection(dev);
4825
4826 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
4827 return yaffs_GetFileSize(in);
4828 }
4829
4830 if (newSize == oldFileSize) {
4831 return oldFileSize;
4832 }
4833
4834 if (newSize < oldFileSize) {
4835
4836 yaffs_PruneResizedChunks(in, newSize);
4837
4838 if (newSizeOfPartialChunk != 0) {
4839 int lastChunk = 1 + newFullChunks;
4b070809 4840
0e8cc8bd
WJ		 4841 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4842
4843 /* Got to read and rewrite the last chunk with its new size and zero pad */
4844 yaffs_ReadChunkDataFromObject(in, lastChunk,
4845 localBuffer);
4846
4847 memset(localBuffer + newSizeOfPartialChunk, 0,
4848 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
4849
4850 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
4851 newSizeOfPartialChunk, 1);
4852
4853 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4854 }
4855
4856 in->variant.fileVariant.fileSize = newSize;
4857
4858 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
4859 } else {
4860 /* newsSize > oldFileSize */
4861 in->variant.fileVariant.fileSize = newSize;
4862 }
4863
4b070809
WD		 4864
4865
0e8cc8bd
WJ		 4866 /* Write a new object header.
4867 * show we've shrunk the file, if need be
4868 * Do this only if the file is not in the deleted directories.
4869 */
4870 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
4871 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
4872 yaffs_UpdateObjectHeader(in, NULL, 0,
4873 (newSize < oldFileSize) ? 1 : 0, 0);
4874 }
4875
4876 return YAFFS_OK;
4877}
4878
4879loff_t yaffs_GetFileSize(yaffs_Object * obj)
4880{
4881 obj = yaffs_GetEquivalentObject(obj);
4882
4883 switch (obj->variantType) {
4884 case YAFFS_OBJECT_TYPE_FILE:
4885 return obj->variant.fileVariant.fileSize;
4886 case YAFFS_OBJECT_TYPE_SYMLINK:
4887 return yaffs_strlen(obj->variant.symLinkVariant.alias);
4888 default:
4889 return 0;
4890 }
4891}
4892
4893
4894
4895int yaffs_FlushFile(yaffs_Object * in, int updateTime)
4896{
4897 int retVal;
4898 if (in->dirty) {
4899 yaffs_FlushFilesChunkCache(in);
4900 if (updateTime) {
4901#ifdef CONFIG_YAFFS_WINCE
4902 yfsd_WinFileTimeNow(in->win_mtime);
4903#else
4904
4905 in->yst_mtime = Y_CURRENT_TIME;
4906
4907#endif
4908 }
4909
4910 retVal =
4911 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
4912 0) ? YAFFS_OK : YAFFS_FAIL;
4913 } else {
4914 retVal = YAFFS_OK;
4915 }
4916
4917 return retVal;
4918
4919}
4920
4921static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
4922{
4923
4924 /* First off, invalidate the file's data in the cache, without flushing. */
4925 yaffs_InvalidateWholeChunkCache(in);
4926
4927 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
4928 /* Move to the unlinked directory so we have a record that it was deleted. */
4929 yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
4930
4931 }
4932
4933 yaffs_RemoveObjectFromDirectory(in);
4934 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
4935 in->chunkId = -1;
4936
4937 yaffs_FreeObject(in);
4938 return YAFFS_OK;
4939
4940}
4941
4942/* yaffs_DeleteFile deletes the whole file data
4943 * and the inode associated with the file.
4944 * It does not delete the links associated with the file.
4945 */
4946static int yaffs_UnlinkFile(yaffs_Object * in)
4947{
4948
4949 int retVal;
4950 int immediateDeletion = 0;
4951
4952 if (1) {
90ef117b
WJ		 4953/* XXX U-BOOT XXX */
4954#if 0
0e8cc8bd
WJ		 4955#ifdef __KERNEL__
4956 if (!in->myInode) {
4957 immediateDeletion = 1;
4958
4959 }
90ef117b 4960#endif
0e8cc8bd
WJ		 4961#else
4962 if (in->inUse <= 0) {
4963 immediateDeletion = 1;
4964
4965 }
4966#endif
4967 if (immediateDeletion) {
4968 retVal =
4969 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
4970 "deleted", 0, 0);
4971 T(YAFFS_TRACE_TRACING,
4972 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
4973 in->objectId));
4974 in->deleted = 1;
4975 in->myDev->nDeletedFiles++;
4976 if (0 && in->myDev->isYaffs2) {
4977 yaffs_ResizeFile(in, 0);
4978 }
4979 yaffs_SoftDeleteFile(in);
4980 } else {
4981 retVal =
4982 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
4983 "unlinked", 0, 0);
4984 }
4985
4986 }
4987 return retVal;
4988}
4989
4990int yaffs_DeleteFile(yaffs_Object * in)
4991{
4992 int retVal = YAFFS_OK;
4993
4994 if (in->nDataChunks > 0) {
4995 /* Use soft deletion if there is data in the file */
4996 if (!in->unlinked) {
4997 retVal = yaffs_UnlinkFile(in);
4998 }
4999 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5000 in->deleted = 1;
5001 in->myDev->nDeletedFiles++;
5002 yaffs_SoftDeleteFile(in);
5003 }
5004 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
5005 } else {
5006 /* The file has no data chunks so we toss it immediately */
5007 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5008 in->variant.fileVariant.top = NULL;
5009 yaffs_DoGenericObjectDeletion(in);
5010
5011 return YAFFS_OK;
5012 }
5013}
5014
5015static int yaffs_DeleteDirectory(yaffs_Object * in)
5016{
5017 /* First check that the directory is empty. */
5018 if (list_empty(&in->variant.directoryVariant.children)) {
5019 return yaffs_DoGenericObjectDeletion(in);
5020 }
5021
5022 return YAFFS_FAIL;
5023
5024}
5025
5026static int yaffs_DeleteSymLink(yaffs_Object * in)
5027{
5028 YFREE(in->variant.symLinkVariant.alias);
5029
5030 return yaffs_DoGenericObjectDeletion(in);
5031}
5032
5033static int yaffs_DeleteHardLink(yaffs_Object * in)
5034{
5035 /* remove this hardlink from the list assocaited with the equivalent
5036 * object
5037 */
5038 list_del(&in->hardLinks);
5039 return yaffs_DoGenericObjectDeletion(in);
5040}
5041
5042static void yaffs_DestroyObject(yaffs_Object * obj)
5043{
5044 switch (obj->variantType) {
5045 case YAFFS_OBJECT_TYPE_FILE:
5046 yaffs_DeleteFile(obj);
5047 break;
5048 case YAFFS_OBJECT_TYPE_DIRECTORY:
5049 yaffs_DeleteDirectory(obj);
5050 break;
5051 case YAFFS_OBJECT_TYPE_SYMLINK:
5052 yaffs_DeleteSymLink(obj);
5053 break;
5054 case YAFFS_OBJECT_TYPE_HARDLINK:
5055 yaffs_DeleteHardLink(obj);
5056 break;
5057 case YAFFS_OBJECT_TYPE_SPECIAL:
5058 yaffs_DoGenericObjectDeletion(obj);
5059 break;
5060 case YAFFS_OBJECT_TYPE_UNKNOWN:
5061 break; /* should not happen. */
5062 }
5063}
5064
5065static int yaffs_UnlinkWorker(yaffs_Object * obj)
5066{
5067
5068 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5069 return yaffs_DeleteHardLink(obj);
5070 } else if (!list_empty(&obj->hardLinks)) {
5071 /* Curve ball: We're unlinking an object that has a hardlink.
5072 *
5073 * This problem arises because we are not strictly following
5074 * The Linux link/inode model.
5075 *
5076 * We can't really delete the object.
5077 * Instead, we do the following:
5078 * - Select a hardlink.
5079 * - Unhook it from the hard links
5080 * - Unhook it from its parent directory (so that the rename can work)
5081 * - Rename the object to the hardlink's name.
5082 * - Delete the hardlink
5083 */
5084
5085 yaffs_Object *hl;
5086 int retVal;
5087 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5088
5089 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5090
5091 list_del_init(&hl->hardLinks);
5092 list_del_init(&hl->siblings);
5093
5094 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5095
5096 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5097
5098 if (retVal == YAFFS_OK) {
5099 retVal = yaffs_DoGenericObjectDeletion(hl);
5100 }
5101 return retVal;
5102
5103 } else {
5104 switch (obj->variantType) {
5105 case YAFFS_OBJECT_TYPE_FILE:
5106 return yaffs_UnlinkFile(obj);
5107 break;
5108 case YAFFS_OBJECT_TYPE_DIRECTORY:
5109 return yaffs_DeleteDirectory(obj);
5110 break;
5111 case YAFFS_OBJECT_TYPE_SYMLINK:
5112 return yaffs_DeleteSymLink(obj);
5113 break;
5114 case YAFFS_OBJECT_TYPE_SPECIAL:
5115 return yaffs_DoGenericObjectDeletion(obj);
5116 break;
5117 case YAFFS_OBJECT_TYPE_HARDLINK:
5118 case YAFFS_OBJECT_TYPE_UNKNOWN:
5119 default:
5120 return YAFFS_FAIL;
5121 }
5122 }
5123}
5124
5125
5126static int yaffs_UnlinkObject( yaffs_Object *obj)
5127{
5128
5129 if (obj && obj->unlinkAllowed) {
5130 return yaffs_UnlinkWorker(obj);
5131 }
5132
5133 return YAFFS_FAIL;
5134
5135}
5136int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
5137{
5138 yaffs_Object *obj;
5139
5140 obj = yaffs_FindObjectByName(dir, name);
5141 return yaffs_UnlinkObject(obj);
5142}
5143
5144/*----------------------- Initialisation Scanning ---------------------- */
5145
5146static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
5147 int backwardScanning)
5148{
5149 yaffs_Object *obj;
5150
5151 if (!backwardScanning) {
5152 /* Handle YAFFS1 forward scanning case
5153 * For YAFFS1 we always do the deletion
5154 */
5155
5156 } else {
5157 /* Handle YAFFS2 case (backward scanning)
5158 * If the shadowed object exists then ignore.
5159 */
5160 if (yaffs_FindObjectByNumber(dev, objId)) {
5161 return;
5162 }
5163 }
5164
5165 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5166 * We put it in unlinked dir to be cleaned up after the scanning
5167 */
5168 obj =
5169 yaffs_FindOrCreateObjectByNumber(dev, objId,
5170 YAFFS_OBJECT_TYPE_FILE);
5171 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5172 obj->variant.fileVariant.shrinkSize = 0;
5173 obj->valid = 1; /* So that we don't read any other info for this file */
5174
5175}
5176
5177typedef struct {
5178 int seq;
5179 int block;
5180} yaffs_BlockIndex;
5181
5182
5183static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5184{
5185 yaffs_Object *hl;
5186 yaffs_Object *in;
4b070809 5187
0e8cc8bd
WJ		 5188 while (hardList) {
5189 hl = hardList;
5190 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5191
5192 in = yaffs_FindObjectByNumber(dev,
5193 hl->variant.hardLinkVariant.
5194 equivalentObjectId);
5195
5196 if (in) {
5197 /* Add the hardlink pointers */
5198 hl->variant.hardLinkVariant.equivalentObject = in;
5199 list_add(&hl->hardLinks, &in->hardLinks);
5200 } else {
5201 /* Todo Need to report/handle this better.
5202 * Got a problem... hardlink to a non-existant object
5203 */
5204 hl->variant.hardLinkVariant.equivalentObject = NULL;
5205 INIT_LIST_HEAD(&hl->hardLinks);
5206
5207 }
5208
5209 }
5210
5211}
5212
5213
5214
5215
5216
5217static int ybicmp(const void *a, const void *b){
5218 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5219 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5220 register int ablock = ((yaffs_BlockIndex *)a)->block;
5221 register int bblock = ((yaffs_BlockIndex *)b)->block;
5222 if( aseq == bseq )
4b070809 5223 return ablock - bblock;
0e8cc8bd 5224 else
4b070809 5225 return aseq - bseq;
0e8cc8bd
WJ		 5226
5227}
5228
5229static int yaffs_Scan(yaffs_Device * dev)
5230{
5231 yaffs_ExtendedTags tags;
5232 int blk;
5233 int blockIterator;
5234 int startIterator;
5235 int endIterator;
5236 int nBlocksToScan = 0;
5237 int result;
5238
5239 int chunk;
5240 int c;
5241 int deleted;
5242 yaffs_BlockState state;
5243 yaffs_Object *hardList = NULL;
5244 yaffs_BlockInfo *bi;
5245 int sequenceNumber;
5246 yaffs_ObjectHeader *oh;
5247 yaffs_Object *in;
5248 yaffs_Object *parent;
5249 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4b070809 5250
0e8cc8bd 5251 int alloc_failed = 0;
4b070809 5252
0e8cc8bd
WJ		 5253
5254 __u8 *chunkData;
5255
5256 yaffs_BlockIndex *blockIndex = NULL;
5257
5258 if (dev->isYaffs2) {
5259 T(YAFFS_TRACE_SCAN,
5260 (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
5261 return YAFFS_FAIL;
5262 }
4b070809 5263
0e8cc8bd 5264 //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
4b070809 5265
0e8cc8bd
WJ		 5266 T(YAFFS_TRACE_SCAN,
5267 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5268 dev->internalStartBlock, dev->internalEndBlock));
5269
5270 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5271
5272 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5273
5274 if (dev->isYaffs2) {
5275 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5276 if(!blockIndex)
5277 return YAFFS_FAIL;
5278 }
5279
5280 /* Scan all the blocks to determine their state */
5281 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5282 bi = yaffs_GetBlockInfo(dev, blk);
5283 yaffs_ClearChunkBits(dev, blk);
5284 bi->pagesInUse = 0;
5285 bi->softDeletions = 0;
5286
5287 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5288
5289 bi->blockState = state;
5290 bi->sequenceNumber = sequenceNumber;
5291
5292 T(YAFFS_TRACE_SCAN_DEBUG,
5293 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5294 state, sequenceNumber));
5295
5296 if (state == YAFFS_BLOCK_STATE_DEAD) {
5297 T(YAFFS_TRACE_BAD_BLOCKS,
5298 (TSTR("block %d is bad" TENDSTR), blk));
5299 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5300 T(YAFFS_TRACE_SCAN_DEBUG,
5301 (TSTR("Block empty " TENDSTR)));
5302 dev->nErasedBlocks++;
5303 dev->nFreeChunks += dev->nChunksPerBlock;
5304 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5305
5306 /* Determine the highest sequence number */
5307 if (dev->isYaffs2 &&
5308 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5309 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5310
5311 blockIndex[nBlocksToScan].seq = sequenceNumber;
5312 blockIndex[nBlocksToScan].block = blk;
5313
5314 nBlocksToScan++;
5315
5316 if (sequenceNumber >= dev->sequenceNumber) {
5317 dev->sequenceNumber = sequenceNumber;
5318 }
5319 } else if (dev->isYaffs2) {
5320 /* TODO: Nasty sequence number! */
5321 T(YAFFS_TRACE_SCAN,
5322 (TSTR
5323 ("Block scanning block %d has bad sequence number %d"
5324 TENDSTR), blk, sequenceNumber));
5325
5326 }
5327 }
5328 }
5329
5330 /* Sort the blocks
5331 * Dungy old bubble sort for now...
5332 */
5333 if (dev->isYaffs2) {
5334 yaffs_BlockIndex temp;
5335 int i;
5336 int j;
5337
5338 for (i = 0; i < nBlocksToScan; i++)
5339 for (j = i + 1; j < nBlocksToScan; j++)
5340 if (blockIndex[i].seq > blockIndex[j].seq) {
5341 temp = blockIndex[j];
5342 blockIndex[j] = blockIndex[i];
5343 blockIndex[i] = temp;
5344 }
5345 }
5346
5347 /* Now scan the blocks looking at the data. */
5348 if (dev->isYaffs2) {
5349 startIterator = 0;
5350 endIterator = nBlocksToScan - 1;
5351 T(YAFFS_TRACE_SCAN_DEBUG,
5352 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5353 } else {
5354 startIterator = dev->internalStartBlock;
5355 endIterator = dev->internalEndBlock;
5356 }
5357
5358 /* For each block.... */
5359 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5360 blockIterator++) {
5361
5362 if (dev->isYaffs2) {
5363 /* get the block to scan in the correct order */
5364 blk = blockIndex[blockIterator].block;
5365 } else {
5366 blk = blockIterator;
5367 }
5368
5369 bi = yaffs_GetBlockInfo(dev, blk);
5370 state = bi->blockState;
5371
5372 deleted = 0;
5373
5374 /* For each chunk in each block that needs scanning....*/
5375 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5376 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5377 /* Read the tags and decide what to do */
5378 chunk = blk * dev->nChunksPerBlock + c;
5379
5380 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5381 &tags);
5382
5383 /* Let's have a good look at this chunk... */
5384
5385 if (!dev->isYaffs2 && tags.chunkDeleted) {
5386 /* YAFFS1 only...
5387 * A deleted chunk
5388 */
5389 deleted++;
5390 dev->nFreeChunks++;
5391 /*T((" %d %d deleted\n",blk,c)); */
5392 } else if (!tags.chunkUsed) {
5393 /* An unassigned chunk in the block
4b070809 5394 * This means that either the block is empty or
0e8cc8bd
WJ		 5395 * this is the one being allocated from
5396 */
5397
5398 if (c == 0) {
5399 /* We're looking at the first chunk in the block so the block is unused */
5400 state = YAFFS_BLOCK_STATE_EMPTY;
5401 dev->nErasedBlocks++;
5402 } else {
5403 /* this is the block being allocated from */
5404 T(YAFFS_TRACE_SCAN,
5405 (TSTR
5406 (" Allocating from %d %d" TENDSTR),
5407 blk, c));
5408 state = YAFFS_BLOCK_STATE_ALLOCATING;
5409 dev->allocationBlock = blk;
5410 dev->allocationPage = c;
4b070809 5411 dev->allocationBlockFinder = blk;
0e8cc8bd 5412 /* Set it to here to encourage the allocator to go forth from here. */
4b070809 5413
0e8cc8bd
WJ		 5414 /* Yaffs2 sanity check:
5415 * This should be the one with the highest sequence number
5416 */
5417 if (dev->isYaffs2
5418 && (dev->sequenceNumber !=
5419 bi->sequenceNumber)) {
5420 T(YAFFS_TRACE_ALWAYS,
5421 (TSTR
5422 ("yaffs: Allocation block %d was not highest sequence id:"
5423 " block seq = %d, dev seq = %d"
5424 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
5425 }
5426 }
5427
5428 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5429 } else if (tags.chunkId > 0) {
5430 /* chunkId > 0 so it is a data chunk... */
5431 unsigned int endpos;
5432
5433 yaffs_SetChunkBit(dev, blk, c);
5434 bi->pagesInUse++;
5435
5436 in = yaffs_FindOrCreateObjectByNumber(dev,
5437 tags.
5438 objectId,
5439 YAFFS_OBJECT_TYPE_FILE);
5440 /* PutChunkIntoFile checks for a clash (two data chunks with
5441 * the same chunkId).
5442 */
4b070809 5443
0e8cc8bd
WJ		 5444 if(!in)
5445 alloc_failed = 1;
5446
5447 if(in){
5448 if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
5449 alloc_failed = 1;
5450 }
4b070809 5451
0e8cc8bd
WJ		 5452 endpos =
5453 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5454 tags.byteCount;
4b070809 5455 if (in &&
0e8cc8bd
WJ		 5456 in->variantType == YAFFS_OBJECT_TYPE_FILE
5457 && in->variant.fileVariant.scannedFileSize <
5458 endpos) {
5459 in->variant.fileVariant.
5460 scannedFileSize = endpos;
5461 if (!dev->useHeaderFileSize) {
5462 in->variant.fileVariant.
5463 fileSize =
5464 in->variant.fileVariant.
5465 scannedFileSize;
5466 }
5467
5468 }
5469 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5470 } else {
5471 /* chunkId == 0, so it is an ObjectHeader.
5472 * Thus, we read in the object header and make the object
5473 */
5474 yaffs_SetChunkBit(dev, blk, c);
5475 bi->pagesInUse++;
5476
5477 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5478 chunkData,
5479 NULL);
5480
5481 oh = (yaffs_ObjectHeader *) chunkData;
5482
5483 in = yaffs_FindObjectByNumber(dev,
5484 tags.objectId);
5485 if (in && in->variantType != oh->type) {
5486 /* This should not happen, but somehow
4b070809 5487 * Wev'e ended up with an objectId that has been reused but not yet
0e8cc8bd
WJ		 5488 * deleted, and worse still it has changed type. Delete the old object.
5489 */
5490
5491 yaffs_DestroyObject(in);
5492
5493 in = 0;
5494 }
5495
5496 in = yaffs_FindOrCreateObjectByNumber(dev,
5497 tags.
5498 objectId,
5499 oh->type);
5500
5501 if(!in)
5502 alloc_failed = 1;
4b070809 5503
0e8cc8bd
WJ		 5504 if (in && oh->shadowsObject > 0) {
5505 yaffs_HandleShadowedObject(dev,
5506 oh->
5507 shadowsObject,
5508 0);
5509 }
5510
5511 if (in && in->valid) {
5512 /* We have already filled this one. We have a duplicate and need to resolve it. */
5513
5514 unsigned existingSerial = in->serial;
5515 unsigned newSerial = tags.serialNumber;
5516
5517 if (dev->isYaffs2 ||
5518 ((existingSerial + 1) & 3) ==
5519 newSerial) {
5520 /* Use new one - destroy the exisiting one */
5521 yaffs_DeleteChunk(dev,
5522 in->chunkId,
5523 1, __LINE__);
5524 in->valid = 0;
5525 } else {
5526 /* Use existing - destroy this one. */
5527 yaffs_DeleteChunk(dev, chunk, 1,
5528 __LINE__);
5529 }
5530 }
5531
5532 if (in && !in->valid &&
5533 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5534 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5535 /* We only load some info, don't fiddle with directory structure */
5536 in->valid = 1;
5537 in->variantType = oh->type;
5538
5539 in->yst_mode = oh->yst_mode;
5540#ifdef CONFIG_YAFFS_WINCE
5541 in->win_atime[0] = oh->win_atime[0];
5542 in->win_ctime[0] = oh->win_ctime[0];
5543 in->win_mtime[0] = oh->win_mtime[0];
5544 in->win_atime[1] = oh->win_atime[1];
5545 in->win_ctime[1] = oh->win_ctime[1];
5546 in->win_mtime[1] = oh->win_mtime[1];
5547#else
5548 in->yst_uid = oh->yst_uid;
5549 in->yst_gid = oh->yst_gid;
5550 in->yst_atime = oh->yst_atime;
5551 in->yst_mtime = oh->yst_mtime;
5552 in->yst_ctime = oh->yst_ctime;
5553 in->yst_rdev = oh->yst_rdev;
5554#endif
5555 in->chunkId = chunk;
5556
5557 } else if (in && !in->valid) {
5558 /* we need to load this info */
5559
5560 in->valid = 1;
5561 in->variantType = oh->type;
5562
5563 in->yst_mode = oh->yst_mode;
5564#ifdef CONFIG_YAFFS_WINCE
5565 in->win_atime[0] = oh->win_atime[0];
5566 in->win_ctime[0] = oh->win_ctime[0];
5567 in->win_mtime[0] = oh->win_mtime[0];
5568 in->win_atime[1] = oh->win_atime[1];
5569 in->win_ctime[1] = oh->win_ctime[1];
5570 in->win_mtime[1] = oh->win_mtime[1];
5571#else
5572 in->yst_uid = oh->yst_uid;
5573 in->yst_gid = oh->yst_gid;
5574 in->yst_atime = oh->yst_atime;
5575 in->yst_mtime = oh->yst_mtime;
5576 in->yst_ctime = oh->yst_ctime;
5577 in->yst_rdev = oh->yst_rdev;
5578#endif
5579 in->chunkId = chunk;
5580
5581 yaffs_SetObjectName(in, oh->name);
5582 in->dirty = 0;
5583
5584 /* directory stuff...
5585 * hook up to parent
5586 */
5587
5588 parent =
5589 yaffs_FindOrCreateObjectByNumber
5590 (dev, oh->parentObjectId,
5591 YAFFS_OBJECT_TYPE_DIRECTORY);
5592 if (parent->variantType ==
5593 YAFFS_OBJECT_TYPE_UNKNOWN) {
5594 /* Set up as a directory */
5595 parent->variantType =
5596 YAFFS_OBJECT_TYPE_DIRECTORY;
5597 INIT_LIST_HEAD(&parent->variant.
5598 directoryVariant.
5599 children);
5600 } else if (parent->variantType !=
5601 YAFFS_OBJECT_TYPE_DIRECTORY)
5602 {
5603 /* Hoosterman, another problem....
5604 * We're trying to use a non-directory as a directory
5605 */
5606
5607 T(YAFFS_TRACE_ERROR,
5608 (TSTR
5609 ("yaffs tragedy: attempting to use non-directory as"
5610 " a directory in scan. Put in lost+found."
5611 TENDSTR)));
5612 parent = dev->lostNFoundDir;
5613 }
5614
5615 yaffs_AddObjectToDirectory(parent, in);
5616
5617 if (0 && (parent == dev->deletedDir ||
5618 parent == dev->unlinkedDir)) {
5619 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
5620 dev->nDeletedFiles++;
5621 }
5622 /* Note re hardlinks.
5623 * Since we might scan a hardlink before its equivalent object is scanned
5624 * we put them all in a list.
5625 * After scanning is complete, we should have all the objects, so we run through this
4b070809 5626 * list and fix up all the chains.
0e8cc8bd
WJ		 5627 */
5628
5629 switch (in->variantType) {
4b070809 5630 case YAFFS_OBJECT_TYPE_UNKNOWN:
0e8cc8bd
WJ		 5631 /* Todo got a problem */
5632 break;
5633 case YAFFS_OBJECT_TYPE_FILE:
5634 if (dev->isYaffs2
5635 && oh->isShrink) {
5636 /* Prune back the shrunken chunks */
5637 yaffs_PruneResizedChunks
5638 (in, oh->fileSize);
5639 /* Mark the block as having a shrinkHeader */
5640 bi->hasShrinkHeader = 1;
5641 }
5642
5643 if (dev->useHeaderFileSize)
5644
5645 in->variant.fileVariant.
5646 fileSize =
5647 oh->fileSize;
5648
5649 break;
5650 case YAFFS_OBJECT_TYPE_HARDLINK:
5651 in->variant.hardLinkVariant.
5652 equivalentObjectId =
5653 oh->equivalentObjectId;
5654 in->hardLinks.next =
5655 (struct list_head *)
5656 hardList;
5657 hardList = in;
5658 break;
5659 case YAFFS_OBJECT_TYPE_DIRECTORY:
5660 /* Do nothing */
5661 break;
5662 case YAFFS_OBJECT_TYPE_SPECIAL:
5663 /* Do nothing */
5664 break;
4b070809 5665 case YAFFS_OBJECT_TYPE_SYMLINK:
0e8cc8bd
WJ		 5666 in->variant.symLinkVariant.alias =
5667 yaffs_CloneString(oh->alias);
5668 if(!in->variant.symLinkVariant.alias)
5669 alloc_failed = 1;
5670 break;
5671 }
5672
5673 if (parent == dev->deletedDir) {
5674 yaffs_DestroyObject(in);
5675 bi->hasShrinkHeader = 1;
5676 }
5677 }
5678 }
5679 }
5680
5681 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5682 /* If we got this far while scanning, then the block is fully allocated.*/
5683 state = YAFFS_BLOCK_STATE_FULL;
5684 }
5685
5686 bi->blockState = state;
5687
5688 /* Now let's see if it was dirty */
5689 if (bi->pagesInUse == 0 &&
5690 !bi->hasShrinkHeader &&
5691 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5692 yaffs_BlockBecameDirty(dev, blk);
5693 }
5694
5695 }
5696
5697 if (blockIndex) {
5698 YFREE(blockIndex);
5699 }
4b070809
WD		 5700
5701
0e8cc8bd
WJ		 5702 /* Ok, we've done all the scanning.
5703 * Fix up the hard link chains.
4b070809 5704 * We should now have scanned all the objects, now it's time to add these
0e8cc8bd
WJ		 5705 * hardlinks.
5706 */
5707
5708 yaffs_HardlinkFixup(dev,hardList);
5709
5710 /* Handle the unlinked files. Since they were left in an unlinked state we should
5711 * just delete them.
5712 */
5713 {
5714 struct list_head *i;
5715 struct list_head *n;
5716
5717 yaffs_Object *l;
5718 /* Soft delete all the unlinked files */
5719 list_for_each_safe(i, n,
5720 &dev->unlinkedDir->variant.directoryVariant.
5721 children) {
5722 if (i) {
5723 l = list_entry(i, yaffs_Object, siblings);
5724 yaffs_DestroyObject(l);
5725 }
5726 }
5727 }
5728
5729 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5730
5731 if(alloc_failed){
5732 return YAFFS_FAIL;
5733 }
4b070809 5734
0e8cc8bd 5735 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
4b070809 5736
0e8cc8bd
WJ		 5737
5738 return YAFFS_OK;
5739}
5740
5741static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5742{
5743 __u8 *chunkData;
5744 yaffs_ObjectHeader *oh;
5745 yaffs_Device *dev = in->myDev;
5746 yaffs_ExtendedTags tags;
5747 int result;
5748 int alloc_failed = 0;
5749
5750 if(!in)
5751 return;
4b070809 5752
0e8cc8bd
WJ		 5753#if 0
5754 T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
5755 in->objectId,
5756 in->lazyLoaded ? "not yet" : "already"));
5757#endif
5758
5759 if(in->lazyLoaded){
5760 in->lazyLoaded = 0;
5761 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5762
5763 result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
4b070809 5764 oh = (yaffs_ObjectHeader *) chunkData;
0e8cc8bd
WJ		 5765
5766 in->yst_mode = oh->yst_mode;
5767#ifdef CONFIG_YAFFS_WINCE
5768 in->win_atime[0] = oh->win_atime[0];
5769 in->win_ctime[0] = oh->win_ctime[0];
5770 in->win_mtime[0] = oh->win_mtime[0];
5771 in->win_atime[1] = oh->win_atime[1];
5772 in->win_ctime[1] = oh->win_ctime[1];
5773 in->win_mtime[1] = oh->win_mtime[1];
5774#else
5775 in->yst_uid = oh->yst_uid;
5776 in->yst_gid = oh->yst_gid;
5777 in->yst_atime = oh->yst_atime;
5778 in->yst_mtime = oh->yst_mtime;
5779 in->yst_ctime = oh->yst_ctime;
5780 in->yst_rdev = oh->yst_rdev;
4b070809 5781
0e8cc8bd
WJ		 5782#endif
5783 yaffs_SetObjectName(in, oh->name);
4b070809 5784
0e8cc8bd
WJ		 5785 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
5786 in->variant.symLinkVariant.alias =
5787 yaffs_CloneString(oh->alias);
5788 if(!in->variant.symLinkVariant.alias)
5789 alloc_failed = 1; /* Not returned to caller */
5790 }
4b070809 5791
0e8cc8bd
WJ		 5792 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
5793 }
5794}
5795
5796static int yaffs_ScanBackwards(yaffs_Device * dev)
5797{
5798 yaffs_ExtendedTags tags;
5799 int blk;
5800 int blockIterator;
5801 int startIterator;
5802 int endIterator;
5803 int nBlocksToScan = 0;
5804
5805 int chunk;
5806 int result;
5807 int c;
5808 int deleted;
5809 yaffs_BlockState state;
5810 yaffs_Object *hardList = NULL;
5811 yaffs_BlockInfo *bi;
5812 int sequenceNumber;
5813 yaffs_ObjectHeader *oh;
5814 yaffs_Object *in;
5815 yaffs_Object *parent;
5816 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5817 int itsUnlinked;
5818 __u8 *chunkData;
4b070809 5819
0e8cc8bd
WJ		 5820 int fileSize;
5821 int isShrink;
5822 int foundChunksInBlock;
5823 int equivalentObjectId;
5824 int alloc_failed = 0;
4b070809 5825
0e8cc8bd
WJ		 5826
5827 yaffs_BlockIndex *blockIndex = NULL;
5828 int altBlockIndex = 0;
5829
5830 if (!dev->isYaffs2) {
5831 T(YAFFS_TRACE_SCAN,
5832 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5833 return YAFFS_FAIL;
5834 }
5835
5836 T(YAFFS_TRACE_SCAN,
5837 (TSTR
5838 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
5839 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5840
5841
5842 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5843
5844 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4b070809 5845
0e8cc8bd
WJ		 5846 if(!blockIndex) {
5847 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
5848 altBlockIndex = 1;
5849 }
4b070809 5850
0e8cc8bd
WJ		 5851 if(!blockIndex) {
5852 T(YAFFS_TRACE_SCAN,
5853 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
5854 return YAFFS_FAIL;
5855 }
4b070809 5856
0e8cc8bd 5857 dev->blocksInCheckpoint = 0;
4b070809 5858
0e8cc8bd
WJ		 5859 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5860
5861 /* Scan all the blocks to determine their state */
5862 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5863 bi = yaffs_GetBlockInfo(dev, blk);
5864 yaffs_ClearChunkBits(dev, blk);
5865 bi->pagesInUse = 0;
5866 bi->softDeletions = 0;
5867
5868 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5869
5870 bi->blockState = state;
5871 bi->sequenceNumber = sequenceNumber;
5872
5873 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
5874 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
4b070809 5875
0e8cc8bd
WJ		 5876 T(YAFFS_TRACE_SCAN_DEBUG,
5877 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5878 state, sequenceNumber));
5879
4b070809 5880
0e8cc8bd
WJ		 5881 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
5882 dev->blocksInCheckpoint++;
4b070809 5883
0e8cc8bd
WJ		 5884 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
5885 T(YAFFS_TRACE_BAD_BLOCKS,
5886 (TSTR("block %d is bad" TENDSTR), blk));
5887 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5888 T(YAFFS_TRACE_SCAN_DEBUG,
5889 (TSTR("Block empty " TENDSTR)));
5890 dev->nErasedBlocks++;
5891 dev->nFreeChunks += dev->nChunksPerBlock;
5892 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5893
5894 /* Determine the highest sequence number */
5895 if (dev->isYaffs2 &&
5896 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5897 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5898
5899 blockIndex[nBlocksToScan].seq = sequenceNumber;
5900 blockIndex[nBlocksToScan].block = blk;
5901
5902 nBlocksToScan++;
5903
5904 if (sequenceNumber >= dev->sequenceNumber) {
5905 dev->sequenceNumber = sequenceNumber;
5906 }
5907 } else if (dev->isYaffs2) {
5908 /* TODO: Nasty sequence number! */
5909 T(YAFFS_TRACE_SCAN,
5910 (TSTR
5911 ("Block scanning block %d has bad sequence number %d"
5912 TENDSTR), blk, sequenceNumber));
5913
5914 }
5915 }
5916 }
5917
5918 T(YAFFS_TRACE_SCAN,
5919 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
5920
5921
5922
5923 YYIELD();
5924
5925 /* Sort the blocks */
5926#ifndef CONFIG_YAFFS_USE_OWN_SORT
5927 {
5928 /* Use qsort now. */
5929 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
5930 }
5931#else
5932 {
4b070809
WD		 5933 /* Dungy old bubble sort... */
5934
0e8cc8bd
WJ		 5935 yaffs_BlockIndex temp;
5936 int i;
5937 int j;
5938
5939 for (i = 0; i < nBlocksToScan; i++)
5940 for (j = i + 1; j < nBlocksToScan; j++)
5941 if (blockIndex[i].seq > blockIndex[j].seq) {
5942 temp = blockIndex[j];
5943 blockIndex[j] = blockIndex[i];
5944 blockIndex[i] = temp;
5945 }
5946 }
5947#endif
5948
5949 YYIELD();
5950
4b070809 5951 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
0e8cc8bd
WJ		 5952
5953 /* Now scan the blocks looking at the data. */
5954 startIterator = 0;
5955 endIterator = nBlocksToScan - 1;
5956 T(YAFFS_TRACE_SCAN_DEBUG,
5957 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5958
5959 /* For each block.... backwards */
5960 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
5961 blockIterator--) {
4b070809 5962 /* Cooperative multitasking! This loop can run for so
0e8cc8bd 5963 long that watchdog timers expire. */
4b070809 5964 YYIELD();
0e8cc8bd
WJ		 5965
5966 /* get the block to scan in the correct order */
5967 blk = blockIndex[blockIterator].block;
5968
5969 bi = yaffs_GetBlockInfo(dev, blk);
4b070809
WD		 5970
5971
0e8cc8bd
WJ		 5972 state = bi->blockState;
5973
5974 deleted = 0;
5975
5976 /* For each chunk in each block that needs scanning.... */
5977 foundChunksInBlock = 0;
4b070809 5978 for (c = dev->nChunksPerBlock - 1;
0e8cc8bd
WJ		 5979 !alloc_failed && c >= 0 &&
5980 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
5981 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
4b070809 5982 /* Scan backwards...
0e8cc8bd
WJ		 5983 * Read the tags and decide what to do
5984 */
4b070809 5985
0e8cc8bd
WJ		 5986 chunk = blk * dev->nChunksPerBlock + c;
5987
5988 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5989 &tags);
5990
5991 /* Let's have a good look at this chunk... */
5992
5993 if (!tags.chunkUsed) {
5994 /* An unassigned chunk in the block.
5995 * If there are used chunks after this one, then
5996 * it is a chunk that was skipped due to failing the erased
5997 * check. Just skip it so that it can be deleted.
5998 * But, more typically, We get here when this is an unallocated
4b070809 5999 * chunk and his means that either the block is empty or
0e8cc8bd
WJ		 6000 * this is the one being allocated from
6001 */
6002
6003 if(foundChunksInBlock)
6004 {
6005 /* This is a chunk that was skipped due to failing the erased check */
4b070809 6006
0e8cc8bd
WJ		 6007 } else if (c == 0) {
6008 /* We're looking at the first chunk in the block so the block is unused */
6009 state = YAFFS_BLOCK_STATE_EMPTY;
6010 dev->nErasedBlocks++;
6011 } else {
6012 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6013 state == YAFFS_BLOCK_STATE_ALLOCATING) {
4b070809 6014 if(dev->sequenceNumber == bi->sequenceNumber) {
0e8cc8bd 6015 /* this is the block being allocated from */
4b070809 6016
0e8cc8bd
WJ		 6017 T(YAFFS_TRACE_SCAN,
6018 (TSTR
6019 (" Allocating from %d %d"
6020 TENDSTR), blk, c));
6021
6022 state = YAFFS_BLOCK_STATE_ALLOCATING;
6023 dev->allocationBlock = blk;
6024 dev->allocationPage = c;
4b070809 6025 dev->allocationBlockFinder = blk;
0e8cc8bd
WJ		 6026 }
6027 else {
6028 /* This is a partially written block that is not
6029 * the current allocation block. This block must have
6030 * had a write failure, so set up for retirement.
6031 */
4b070809 6032
0e8cc8bd
WJ		 6033 bi->needsRetiring = 1;
6034 bi->gcPrioritise = 1;
4b070809 6035
0e8cc8bd
WJ		 6036 T(YAFFS_TRACE_ALWAYS,
6037 (TSTR("Partially written block %d being set for retirement" TENDSTR),
6038 blk));
6039 }
6040
6041 }
4b070809 6042
0e8cc8bd
WJ		 6043 }
6044
6045 dev->nFreeChunks++;
4b070809 6046
0e8cc8bd
WJ		 6047 } else if (tags.chunkId > 0) {
6048 /* chunkId > 0 so it is a data chunk... */
6049 unsigned int endpos;
6050 __u32 chunkBase =
6051 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
4b070809 6052
0e8cc8bd
WJ		 6053 foundChunksInBlock = 1;
6054
6055
6056 yaffs_SetChunkBit(dev, blk, c);
6057 bi->pagesInUse++;
6058
6059 in = yaffs_FindOrCreateObjectByNumber(dev,
6060 tags.
6061 objectId,
6062 YAFFS_OBJECT_TYPE_FILE);
6063 if(!in){
6064 /* Out of memory */
6065 alloc_failed = 1;
6066 }
4b070809 6067
0e8cc8bd
WJ		 6068 if (in &&
6069 in->variantType == YAFFS_OBJECT_TYPE_FILE
6070 && chunkBase <
6071 in->variant.fileVariant.shrinkSize) {
6072 /* This has not been invalidated by a resize */
6073 if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
6074 chunk, -1)){
6075 alloc_failed = 1;
6076 }
6077
4b070809 6078 /* File size is calculated by looking at the data chunks if we have not
0e8cc8bd
WJ		 6079 * seen an object header yet. Stop this practice once we find an object header.
6080 */
6081 endpos =
6082 (tags.chunkId -
6083 1) * dev->nDataBytesPerChunk +
6084 tags.byteCount;
4b070809 6085
0e8cc8bd
WJ		 6086 if (!in->valid && /* have not got an object header yet */
6087 in->variant.fileVariant.
6088 scannedFileSize < endpos) {
6089 in->variant.fileVariant.
6090 scannedFileSize = endpos;
6091 in->variant.fileVariant.
6092 fileSize =
6093 in->variant.fileVariant.
6094 scannedFileSize;
6095 }
6096
6097 } else if(in) {
6098 /* This chunk has been invalidated by a resize, so delete */
6099 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6100
6101 }
6102 } else {
6103 /* chunkId == 0, so it is an ObjectHeader.
6104 * Thus, we read in the object header and make the object
6105 */
6106 foundChunksInBlock = 1;
6107
6108 yaffs_SetChunkBit(dev, blk, c);
6109 bi->pagesInUse++;
6110
6111 oh = NULL;
6112 in = NULL;
6113
6114 if (tags.extraHeaderInfoAvailable) {
6115 in = yaffs_FindOrCreateObjectByNumber
6116 (dev, tags.objectId,
6117 tags.extraObjectType);
6118 }
6119
6120 if (!in ||
6121#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6122 !in->valid ||
6123#endif
6124 tags.extraShadows ||
6125 (!in->valid &&
6126 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6127 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
6128 ) {
6129
6130 /* If we don't have valid info then we need to read the chunk
4b070809 6131 * TODO In future we can probably defer reading the chunk and
0e8cc8bd
WJ		 6132 * living with invalid data until needed.
6133 */
6134
6135 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6136 chunk,
6137 chunkData,
6138 NULL);
6139
6140 oh = (yaffs_ObjectHeader *) chunkData;
6141
6142 if (!in)
6143 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6144
6145 }
6146
6147 if (!in) {
6148 /* TODO Hoosterman we have a problem! */
6149 T(YAFFS_TRACE_ERROR,
6150 (TSTR
6151 ("yaffs tragedy: Could not make object for object %d "
6152 "at chunk %d during scan"
6153 TENDSTR), tags.objectId, chunk));
6154
6155 }
6156
6157 if (in->valid) {
6158 /* We have already filled this one.
4b070809 6159 * We have a duplicate that will be discarded, but
0e8cc8bd
WJ		 6160 * we first have to suck out resize info if it is a file.
6161 */
6162
4b070809
WD		 6163 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6164 ((oh &&
0e8cc8bd
WJ		 6165 oh-> type == YAFFS_OBJECT_TYPE_FILE)||
6166 (tags.extraHeaderInfoAvailable &&
6167 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
6168 ) {
6169 __u32 thisSize =
6170 (oh) ? oh->fileSize : tags.
6171 extraFileLength;
6172 __u32 parentObjectId =
6173 (oh) ? oh->
6174 parentObjectId : tags.
6175 extraParentObjectId;
6176 unsigned isShrink =
6177 (oh) ? oh->isShrink : tags.
6178 extraIsShrinkHeader;
6179
6180 /* If it is deleted (unlinked at start also means deleted)
6181 * we treat the file size as being zeroed at this point.
6182 */
6183 if (parentObjectId ==
6184 YAFFS_OBJECTID_DELETED
6185 || parentObjectId ==
6186 YAFFS_OBJECTID_UNLINKED) {
6187 thisSize = 0;
6188 isShrink = 1;
6189 }
6190
6191 if (isShrink &&
6192 in->variant.fileVariant.
6193 shrinkSize > thisSize) {
6194 in->variant.fileVariant.
6195 shrinkSize =
6196 thisSize;
6197 }
6198
6199 if (isShrink) {
6200 bi->hasShrinkHeader = 1;
6201 }
6202
6203 }
6204 /* Use existing - destroy this one. */
6205 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6206
6207 }
6208
6209 if (!in->valid &&
6210 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6211 tags.objectId ==
6212 YAFFS_OBJECTID_LOSTNFOUND)) {
6213 /* We only load some info, don't fiddle with directory structure */
6214 in->valid = 1;
4b070809 6215
0e8cc8bd
WJ		 6216 if(oh) {
6217 in->variantType = oh->type;
6218
6219 in->yst_mode = oh->yst_mode;
6220#ifdef CONFIG_YAFFS_WINCE
6221 in->win_atime[0] = oh->win_atime[0];
6222 in->win_ctime[0] = oh->win_ctime[0];
6223 in->win_mtime[0] = oh->win_mtime[0];
6224 in->win_atime[1] = oh->win_atime[1];
6225 in->win_ctime[1] = oh->win_ctime[1];
6226 in->win_mtime[1] = oh->win_mtime[1];
6227#else
6228 in->yst_uid = oh->yst_uid;
6229 in->yst_gid = oh->yst_gid;
6230 in->yst_atime = oh->yst_atime;
6231 in->yst_mtime = oh->yst_mtime;
6232 in->yst_ctime = oh->yst_ctime;
6233 in->yst_rdev = oh->yst_rdev;
4b070809 6234
0e8cc8bd
WJ		 6235#endif
6236 } else {
6237 in->variantType = tags.extraObjectType;
6238 in->lazyLoaded = 1;
6239 }
4b070809 6240
0e8cc8bd
WJ		 6241 in->chunkId = chunk;
6242
6243 } else if (!in->valid) {
6244 /* we need to load this info */
6245
6246 in->valid = 1;
6247 in->chunkId = chunk;
4b070809 6248
0e8cc8bd
WJ		 6249 if(oh) {
6250 in->variantType = oh->type;
6251
6252 in->yst_mode = oh->yst_mode;
6253#ifdef CONFIG_YAFFS_WINCE
6254 in->win_atime[0] = oh->win_atime[0];
6255 in->win_ctime[0] = oh->win_ctime[0];
6256 in->win_mtime[0] = oh->win_mtime[0];
6257 in->win_atime[1] = oh->win_atime[1];
6258 in->win_ctime[1] = oh->win_ctime[1];
6259 in->win_mtime[1] = oh->win_mtime[1];
6260#else
6261 in->yst_uid = oh->yst_uid;
6262 in->yst_gid = oh->yst_gid;
6263 in->yst_atime = oh->yst_atime;
6264 in->yst_mtime = oh->yst_mtime;
6265 in->yst_ctime = oh->yst_ctime;
6266 in->yst_rdev = oh->yst_rdev;
6267#endif
6268
4b070809 6269 if (oh->shadowsObject > 0)
0e8cc8bd
WJ		 6270 yaffs_HandleShadowedObject(dev,
6271 oh->
6272 shadowsObject,
6273 1);
4b070809 6274
0e8cc8bd
WJ		 6275
6276 yaffs_SetObjectName(in, oh->name);
6277 parent =
6278 yaffs_FindOrCreateObjectByNumber
4b070809
WD		 6279 (dev, oh->parentObjectId,
6280 YAFFS_OBJECT_TYPE_DIRECTORY);
0e8cc8bd
WJ		 6281
6282 fileSize = oh->fileSize;
4b070809 6283 isShrink = oh->isShrink;
0e8cc8bd
WJ		 6284 equivalentObjectId = oh->equivalentObjectId;
6285
6286 }
6287 else {
6288 in->variantType = tags.extraObjectType;
6289 parent =
6290 yaffs_FindOrCreateObjectByNumber
4b070809
WD		 6291 (dev, tags.extraParentObjectId,
6292 YAFFS_OBJECT_TYPE_DIRECTORY);
0e8cc8bd
WJ		 6293 fileSize = tags.extraFileLength;
6294 isShrink = tags.extraIsShrinkHeader;
6295 equivalentObjectId = tags.extraEquivalentObjectId;
6296 in->lazyLoaded = 1;
6297
6298 }
6299 in->dirty = 0;
6300
6301 /* directory stuff...
6302 * hook up to parent
6303 */
6304
6305 if (parent->variantType ==
6306 YAFFS_OBJECT_TYPE_UNKNOWN) {
6307 /* Set up as a directory */
6308 parent->variantType =
6309 YAFFS_OBJECT_TYPE_DIRECTORY;
6310 INIT_LIST_HEAD(&parent->variant.
6311 directoryVariant.
6312 children);
6313 } else if (parent->variantType !=
6314 YAFFS_OBJECT_TYPE_DIRECTORY)
6315 {
6316 /* Hoosterman, another problem....
6317 * We're trying to use a non-directory as a directory
6318 */
6319
6320 T(YAFFS_TRACE_ERROR,
6321 (TSTR
6322 ("yaffs tragedy: attempting to use non-directory as"
6323 " a directory in scan. Put in lost+found."
6324 TENDSTR)));
6325 parent = dev->lostNFoundDir;
6326 }
6327
6328 yaffs_AddObjectToDirectory(parent, in);
6329
6330 itsUnlinked = (parent == dev->deletedDir) ||
6331 (parent == dev->unlinkedDir);
6332
6333 if (isShrink) {
6334 /* Mark the block as having a shrinkHeader */
6335 bi->hasShrinkHeader = 1;
6336 }
6337
6338 /* Note re hardlinks.
6339 * Since we might scan a hardlink before its equivalent object is scanned
6340 * we put them all in a list.
6341 * After scanning is complete, we should have all the objects, so we run
4b070809 6342 * through this list and fix up all the chains.
0e8cc8bd
WJ		 6343 */
6344
6345 switch (in->variantType) {
4b070809 6346 case YAFFS_OBJECT_TYPE_UNKNOWN:
0e8cc8bd
WJ		 6347 /* Todo got a problem */
6348 break;
6349 case YAFFS_OBJECT_TYPE_FILE:
6350
6351 if (in->variant.fileVariant.
6352 scannedFileSize < fileSize) {
6353 /* This covers the case where the file size is greater
6354 * than where the data is
4b070809 6355 * This will happen if the file is resized to be larger
0e8cc8bd
WJ		 6356 * than its current data extents.
6357 */
6358 in->variant.fileVariant.fileSize = fileSize;
6359 in->variant.fileVariant.scannedFileSize =
6360 in->variant.fileVariant.fileSize;
6361 }
6362
6363 if (isShrink &&
6364 in->variant.fileVariant.shrinkSize > fileSize) {
6365 in->variant.fileVariant.shrinkSize = fileSize;
6366 }
6367
6368 break;
6369 case YAFFS_OBJECT_TYPE_HARDLINK:
6370 if(!itsUnlinked) {
6371 in->variant.hardLinkVariant.equivalentObjectId =
6372 equivalentObjectId;
6373 in->hardLinks.next =
6374 (struct list_head *) hardList;
6375 hardList = in;
6376 }
6377 break;
6378 case YAFFS_OBJECT_TYPE_DIRECTORY:
6379 /* Do nothing */
6380 break;
6381 case YAFFS_OBJECT_TYPE_SPECIAL:
6382 /* Do nothing */
6383 break;
6384 case YAFFS_OBJECT_TYPE_SYMLINK:
6385 if(oh){
6386 in->variant.symLinkVariant.alias =
6387 yaffs_CloneString(oh->
6388 alias);
6389 if(!in->variant.symLinkVariant.alias)
4b070809 6390 alloc_failed = 1;
0e8cc8bd
WJ		 6391 }
6392 break;
6393 }
6394
6395 }
4b070809 6396
0e8cc8bd
WJ		 6397 }
6398
6399 } /* End of scanning for each chunk */
6400
6401 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6402 /* If we got this far while scanning, then the block is fully allocated. */
6403 state = YAFFS_BLOCK_STATE_FULL;
6404 }
6405
6406 bi->blockState = state;
6407
6408 /* Now let's see if it was dirty */
6409 if (bi->pagesInUse == 0 &&
6410 !bi->hasShrinkHeader &&
6411 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6412 yaffs_BlockBecameDirty(dev, blk);
6413 }
6414
6415 }
6416
4b070809 6417 if (altBlockIndex)
0e8cc8bd
WJ		 6418 YFREE_ALT(blockIndex);
6419 else
6420 YFREE(blockIndex);
4b070809 6421
0e8cc8bd
WJ		 6422 /* Ok, we've done all the scanning.
6423 * Fix up the hard link chains.
4b070809 6424 * We should now have scanned all the objects, now it's time to add these
0e8cc8bd
WJ		 6425 * hardlinks.
6426 */
6427 yaffs_HardlinkFixup(dev,hardList);
4b070809
WD		 6428
6429
0e8cc8bd
WJ		 6430 /*
6431 * Sort out state of unlinked and deleted objects.
6432 */
6433 {
6434 struct list_head *i;
6435 struct list_head *n;
6436
6437 yaffs_Object *l;
6438
6439 /* Soft delete all the unlinked files */
6440 list_for_each_safe(i, n,
6441 &dev->unlinkedDir->variant.directoryVariant.
6442 children) {
6443 if (i) {
6444 l = list_entry(i, yaffs_Object, siblings);
6445 yaffs_DestroyObject(l);
6446 }
6447 }
6448
6449 /* Soft delete all the deletedDir files */
6450 list_for_each_safe(i, n,
6451 &dev->deletedDir->variant.directoryVariant.
6452 children) {
6453 if (i) {
6454 l = list_entry(i, yaffs_Object, siblings);
6455 yaffs_DestroyObject(l);
6456
6457 }
6458 }
6459 }
6460
6461 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4b070809 6462
0e8cc8bd
WJ		 6463 if(alloc_failed){
6464 return YAFFS_FAIL;
6465 }
6466
6467 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6468
6469 return YAFFS_OK;
6470}
6471
6472/*------------------------------ Directory Functions ----------------------------- */
6473
6474static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
6475{
6476 yaffs_Device *dev = obj->myDev;
4b070809 6477
0e8cc8bd
WJ		 6478 if(dev && dev->removeObjectCallback)
6479 dev->removeObjectCallback(obj);
4b070809 6480
0e8cc8bd
WJ		 6481 list_del_init(&obj->siblings);
6482 obj->parent = NULL;
6483}
6484
6485
6486static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
6487 yaffs_Object * obj)
6488{
6489
6490 if (!directory) {
6491 T(YAFFS_TRACE_ALWAYS,
6492 (TSTR
6493 ("tragedy: Trying to add an object to a null pointer directory"
6494 TENDSTR)));
6495 YBUG();
6496 }
6497 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6498 T(YAFFS_TRACE_ALWAYS,
6499 (TSTR
6500 ("tragedy: Trying to add an object to a non-directory"
6501 TENDSTR)));
6502 YBUG();
6503 }
6504
6505 if (obj->siblings.prev == NULL) {
6506 /* Not initialised */
6507 INIT_LIST_HEAD(&obj->siblings);
6508
6509 } else if (!list_empty(&obj->siblings)) {
6510 /* If it is holed up somewhere else, un hook it */
6511 yaffs_RemoveObjectFromDirectory(obj);
6512 }
6513 /* Now add it */
6514 list_add(&obj->siblings, &directory->variant.directoryVariant.children);
6515 obj->parent = directory;
6516
6517 if (directory == obj->myDev->unlinkedDir
6518 || directory == obj->myDev->deletedDir) {
6519 obj->unlinked = 1;
6520 obj->myDev->nUnlinkedFiles++;
6521 obj->renameAllowed = 0;
6522 }
6523}
6524
6525yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
6526 const YCHAR * name)
6527{
6528 int sum;
6529
6530 struct list_head *i;
6531 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6532
6533 yaffs_Object *l;
6534
6535 if (!name) {
6536 return NULL;
6537 }
6538
6539 if (!directory) {
6540 T(YAFFS_TRACE_ALWAYS,
6541 (TSTR
6542 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6543 TENDSTR)));
6544 YBUG();
6545 }
6546 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6547 T(YAFFS_TRACE_ALWAYS,
6548 (TSTR
6549 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6550 YBUG();
6551 }
6552
6553 sum = yaffs_CalcNameSum(name);
6554
6555 list_for_each(i, &directory->variant.directoryVariant.children) {
6556 if (i) {
6557 l = list_entry(i, yaffs_Object, siblings);
4b070809 6558
0e8cc8bd
WJ		 6559 yaffs_CheckObjectDetailsLoaded(l);
6560
6561 /* Special case for lost-n-found */
6562 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6563 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
6564 return l;
6565 }
4b070809 6566 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
0e8cc8bd
WJ		 6567 {
6568 /* LostnFound cunk called Objxxx
6569 * Do a real check
6570 */
6571 yaffs_GetObjectName(l, buffer,
6572 YAFFS_MAX_NAME_LENGTH);
6573 if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
6574 return l;
6575 }
6576
6577 }
6578 }
6579 }
6580
6581 return NULL;
6582}
6583
6584
6585#if 0
6586int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
6587 int (*fn) (yaffs_Object *))
6588{
6589 struct list_head *i;
6590 yaffs_Object *l;
6591
6592 if (!theDir) {
6593 T(YAFFS_TRACE_ALWAYS,
6594 (TSTR
6595 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6596 TENDSTR)));
6597 YBUG();
6598 }
6599 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6600 T(YAFFS_TRACE_ALWAYS,
6601 (TSTR
6602 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6603 YBUG();
6604 }
6605
6606 list_for_each(i, &theDir->variant.directoryVariant.children) {
6607 if (i) {
6608 l = list_entry(i, yaffs_Object, siblings);
6609 if (l && !fn(l)) {
6610 return YAFFS_FAIL;
6611 }
6612 }
6613 }
6614
6615 return YAFFS_OK;
6616
6617}
6618#endif
6619
6620/* GetEquivalentObject dereferences any hard links to get to the
6621 * actual object.
6622 */
6623
6624yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
6625{
6626 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6627 /* We want the object id of the equivalent object, not this one */
6628 obj = obj->variant.hardLinkVariant.equivalentObject;
6629 yaffs_CheckObjectDetailsLoaded(obj);
6630 }
6631 return obj;
6632
6633}
6634
6635int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
6636{
6637 memset(name, 0, buffSize * sizeof(YCHAR));
4b070809 6638
0e8cc8bd
WJ		 6639 yaffs_CheckObjectDetailsLoaded(obj);
6640
6641 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6642 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6643 } else if (obj->chunkId <= 0) {
6644 YCHAR locName[20];
6645 /* make up a name */
6646 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
6647 obj->objectId);
6648 yaffs_strncpy(name, locName, buffSize - 1);
6649
6650 }
6651#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6652 else if (obj->shortName[0]) {
6653 yaffs_strcpy(name, obj->shortName);
6654 }
6655#endif
6656 else {
6657 int result;
6658 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6659
6660 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6661
6662 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6663
6664 if (obj->chunkId >= 0) {
6665 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6666 obj->chunkId, buffer,
6667 NULL);
6668 }
6669 yaffs_strncpy(name, oh->name, buffSize - 1);
6670
6671 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6672 }
6673
6674 return yaffs_strlen(name);
6675}
6676
6677int yaffs_GetObjectFileLength(yaffs_Object * obj)
6678{
6679
6680 /* Dereference any hard linking */
6681 obj = yaffs_GetEquivalentObject(obj);
6682
6683 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
6684 return obj->variant.fileVariant.fileSize;
6685 }
6686 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6687 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6688 } else {
6689 /* Only a directory should drop through to here */
6690 return obj->myDev->nDataBytesPerChunk;
6691 }
6692}
6693
6694int yaffs_GetObjectLinkCount(yaffs_Object * obj)
6695{
6696 int count = 0;
6697 struct list_head *i;
6698
6699 if (!obj->unlinked) {
6700 count++; /* the object itself */
6701 }
6702 list_for_each(i, &obj->hardLinks) {
6703 count++; /* add the hard links; */
6704 }
6705 return count;
6706
6707}
6708
6709int yaffs_GetObjectInode(yaffs_Object * obj)
6710{
6711 obj = yaffs_GetEquivalentObject(obj);
6712
6713 return obj->objectId;
6714}
6715
6716unsigned yaffs_GetObjectType(yaffs_Object * obj)
6717{
6718 obj = yaffs_GetEquivalentObject(obj);
6719
6720 switch (obj->variantType) {
6721 case YAFFS_OBJECT_TYPE_FILE:
6722 return DT_REG;
6723 break;
6724 case YAFFS_OBJECT_TYPE_DIRECTORY:
6725 return DT_DIR;
6726 break;
6727 case YAFFS_OBJECT_TYPE_SYMLINK:
6728 return DT_LNK;
6729 break;
6730 case YAFFS_OBJECT_TYPE_HARDLINK:
6731 return DT_REG;
6732 break;
6733 case YAFFS_OBJECT_TYPE_SPECIAL:
6734 if (S_ISFIFO(obj->yst_mode))
6735 return DT_FIFO;
6736 if (S_ISCHR(obj->yst_mode))
6737 return DT_CHR;
6738 if (S_ISBLK(obj->yst_mode))
6739 return DT_BLK;
6740 if (S_ISSOCK(obj->yst_mode))
6741 return DT_SOCK;
6742 default:
6743 return DT_REG;
6744 break;
6745 }
6746}
6747
6748YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
6749{
6750 obj = yaffs_GetEquivalentObject(obj);
6751 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6752 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
6753 } else {
6754 return yaffs_CloneString(_Y(""));
6755 }
6756}
6757
6758#ifndef CONFIG_YAFFS_WINCE
6759
6760int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
6761{
6762 unsigned int valid = attr->ia_valid;
6763
6764 if (valid & ATTR_MODE)
6765 obj->yst_mode = attr->ia_mode;
6766 if (valid & ATTR_UID)
6767 obj->yst_uid = attr->ia_uid;
6768 if (valid & ATTR_GID)
6769 obj->yst_gid = attr->ia_gid;
6770
6771 if (valid & ATTR_ATIME)
6772 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
6773 if (valid & ATTR_CTIME)
6774 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
6775 if (valid & ATTR_MTIME)
6776 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
6777
6778 if (valid & ATTR_SIZE)
6779 yaffs_ResizeFile(obj, attr->ia_size);
6780
6781 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6782
6783 return YAFFS_OK;
6784
6785}
6786int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
6787{
6788 unsigned int valid = 0;
6789
6790 attr->ia_mode = obj->yst_mode;
6791 valid |= ATTR_MODE;
6792 attr->ia_uid = obj->yst_uid;
6793 valid |= ATTR_UID;
6794 attr->ia_gid = obj->yst_gid;
6795 valid |= ATTR_GID;
6796
6797 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
6798 valid |= ATTR_ATIME;
6799 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
6800 valid |= ATTR_CTIME;
6801 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
6802 valid |= ATTR_MTIME;
6803
6804 attr->ia_size = yaffs_GetFileSize(obj);
6805 valid |= ATTR_SIZE;
6806
6807 attr->ia_valid = valid;
6808
6809 return YAFFS_OK;
6810
6811}
6812
6813#endif
6814
6815#if 0
6816int yaffs_DumpObject(yaffs_Object * obj)
6817{
6818 YCHAR name[257];
6819
6820 yaffs_GetObjectName(obj, name, 256);
6821
6822 T(YAFFS_TRACE_ALWAYS,
6823 (TSTR
6824 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
6825 " chunk %d type %d size %d\n"
6826 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
6827 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
6828 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
6829
6830 return YAFFS_OK;
6831}
6832#endif
6833
6834/*---------------------------- Initialisation code -------------------------------------- */
6835
6836static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
6837{
6838
6839 /* Common functions, gotta have */
6840 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
6841 return 0;
6842
6843#ifdef CONFIG_YAFFS_YAFFS2
6844
6845 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
6846 if (dev->writeChunkWithTagsToNAND &&
6847 dev->readChunkWithTagsFromNAND &&
6848 !dev->writeChunkToNAND &&
6849 !dev->readChunkFromNAND &&
6850 dev->markNANDBlockBad && dev->queryNANDBlock)
6851 return 1;
6852#endif
6853
6854 /* Can use the "spare" style interface for yaffs1 */
6855 if (!dev->isYaffs2 &&
6856 !dev->writeChunkWithTagsToNAND &&
6857 !dev->readChunkWithTagsFromNAND &&
6858 dev->writeChunkToNAND &&
6859 dev->readChunkFromNAND &&
6860 !dev->markNANDBlockBad && !dev->queryNANDBlock)
6861 return 1;
6862
6863 return 0; /* bad */
6864}
6865
6866
6867static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
6868{
6869 /* Initialise the unlinked, deleted, root and lost and found directories */
4b070809 6870
0e8cc8bd
WJ		 6871 dev->lostNFoundDir = dev->rootDir = NULL;
6872 dev->unlinkedDir = dev->deletedDir = NULL;
6873
6874 dev->unlinkedDir =
6875 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4b070809 6876
0e8cc8bd
WJ		 6877 dev->deletedDir =
6878 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
6879
6880 dev->rootDir =
6881 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
6882 YAFFS_ROOT_MODE | S_IFDIR);
6883 dev->lostNFoundDir =
6884 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
6885 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
4b070809 6886
0e8cc8bd
WJ		 6887 if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
6888 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
6889 return YAFFS_OK;
6890 }
4b070809 6891
0e8cc8bd
WJ		 6892 return YAFFS_FAIL;
6893}
6894
6895int yaffs_GutsInitialise(yaffs_Device * dev)
6896{
6897 int init_failed = 0;
6898 unsigned x;
6899 int bits;
6900
6901 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
6902
6903 /* Check stuff that must be set */
6904
6905 if (!dev) {
6906 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
6907 return YAFFS_FAIL;
6908 }
6909
6910 dev->internalStartBlock = dev->startBlock;
6911 dev->internalEndBlock = dev->endBlock;
6912 dev->blockOffset = 0;
6913 dev->chunkOffset = 0;
6914 dev->nFreeChunks = 0;
6915
6916 if (dev->startBlock == 0) {
6917 dev->internalStartBlock = dev->startBlock + 1;
6918 dev->internalEndBlock = dev->endBlock + 1;
6919 dev->blockOffset = 1;
6920 dev->chunkOffset = dev->nChunksPerBlock;
6921 }
6922
6923 /* Check geometry parameters. */
6924
4b070809
WD		 6925 if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
6926 (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
6927 dev->nChunksPerBlock < 2 ||
6928 dev->nReservedBlocks < 2 ||
6929 dev->internalStartBlock <= 0 ||
6930 dev->internalEndBlock <= 0 ||
0e8cc8bd
WJ		 6931 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
6932 ) {
6933 T(YAFFS_TRACE_ALWAYS,
6934 (TSTR
6935 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
6936 TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
6937 return YAFFS_FAIL;
6938 }
6939
6940 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
6941 T(YAFFS_TRACE_ALWAYS,
6942 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
6943 return YAFFS_FAIL;
6944 }
6945
6946 /* Got the right mix of functions? */
6947 if (!yaffs_CheckDevFunctions(dev)) {
6948 /* Function missing */
6949 T(YAFFS_TRACE_ALWAYS,
6950 (TSTR
6951 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
6952
6953 return YAFFS_FAIL;
6954 }
6955
6956 /* This is really a compilation check. */
6957 if (!yaffs_CheckStructures()) {
6958 T(YAFFS_TRACE_ALWAYS,
6959 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
6960 return YAFFS_FAIL;
6961 }
6962
6963 if (dev->isMounted) {
6964 T(YAFFS_TRACE_ALWAYS,
6965 (TSTR("yaffs: device already mounted\n" TENDSTR)));
6966 return YAFFS_FAIL;
6967 }
6968
6969 /* Finished with most checks. One or two more checks happen later on too. */
6970
6971 dev->isMounted = 1;
6972
6973
6974
6975 /* OK now calculate a few things for the device */
4b070809 6976
0e8cc8bd 6977 /*
4b070809 6978 * Calculate all the chunk size manipulation numbers:
0e8cc8bd
WJ		 6979 */
6980 /* Start off assuming it is a power of 2 */
6981 dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
6982 dev->chunkMask = (1<<dev->chunkShift) - 1;
6983
6984 if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
4b070809 6985 /* Yes it is a power of 2, disable crumbs */
0e8cc8bd
WJ		 6986 dev->crumbMask = 0;
6987 dev->crumbShift = 0;
6988 dev->crumbsPerChunk = 0;
6989 } else {
4b070809 6990 /* Not a power of 2, use crumbs instead */
0e8cc8bd
WJ		 6991 dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
6992 dev->crumbMask = (1<<dev->crumbShift)-1;
6993 dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
6994 dev->chunkShift = 0;
6995 dev->chunkMask = 0;
6996 }
4b070809 6997
0e8cc8bd
WJ		 6998
6999 /*
7000 * Calculate chunkGroupBits.
7001 * We need to find the next power of 2 > than internalEndBlock
7002 */
7003
7004 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
4b070809 7005
0e8cc8bd 7006 bits = ShiftsGE(x);
4b070809 7007
0e8cc8bd
WJ		 7008 /* Set up tnode width if wide tnodes are enabled. */
7009 if(!dev->wideTnodesDisabled){
7010 /* bits must be even so that we end up with 32-bit words */
7011 if(bits & 1)
7012 bits++;
7013 if(bits < 16)
7014 dev->tnodeWidth = 16;
7015 else
7016 dev->tnodeWidth = bits;
7017 }
7018 else
7019 dev->tnodeWidth = 16;
4b070809 7020
0e8cc8bd 7021 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
4b070809 7022
0e8cc8bd
WJ		 7023 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7024 * so if the bitwidth of the
7025 * chunk range we're using is greater than 16 we need
7026 * to figure out chunk shift and chunkGroupSize
7027 */
4b070809 7028
0e8cc8bd
WJ		 7029 if (bits <= dev->tnodeWidth)
7030 dev->chunkGroupBits = 0;
7031 else
7032 dev->chunkGroupBits = bits - dev->tnodeWidth;
4b070809 7033
0e8cc8bd
WJ		 7034
7035 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7036
7037 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7038 /* We have a problem because the soft delete won't work if
7039 * the chunk group size > chunks per block.
7040 * This can be remedied by using larger "virtual blocks".
7041 */
7042 T(YAFFS_TRACE_ALWAYS,
7043 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7044
7045 return YAFFS_FAIL;
7046 }
7047
7048 /* OK, we've finished verifying the device, lets continue with initialisation */
7049
7050 /* More device initialisation */
7051 dev->garbageCollections = 0;
7052 dev->passiveGarbageCollections = 0;
7053 dev->currentDirtyChecker = 0;
7054 dev->bufferedBlock = -1;
7055 dev->doingBufferedBlockRewrite = 0;
7056 dev->nDeletedFiles = 0;
7057 dev->nBackgroundDeletions = 0;
7058 dev->nUnlinkedFiles = 0;
7059 dev->eccFixed = 0;
7060 dev->eccUnfixed = 0;
7061 dev->tagsEccFixed = 0;
7062 dev->tagsEccUnfixed = 0;
7063 dev->nErasureFailures = 0;
7064 dev->nErasedBlocks = 0;
7065 dev->isDoingGC = 0;
7066 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7067
7068 /* Initialise temporary buffers and caches. */
7069 if(!yaffs_InitialiseTempBuffers(dev))
7070 init_failed = 1;
4b070809 7071
0e8cc8bd
WJ		 7072 dev->srCache = NULL;
7073 dev->gcCleanupList = NULL;
4b070809
WD		 7074
7075
0e8cc8bd
WJ		 7076 if (!init_failed &&
7077 dev->nShortOpCaches > 0) {
7078 int i;
7079 __u8 *buf;
7080 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7081
7082 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
7083 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7084 }
7085
068d6f9a
WD		 7086 dev->srCache = YMALLOC(srCacheBytes);
7087 buf = (__u8 *)dev->srCache;
4b070809 7088
0e8cc8bd
WJ		 7089 if(dev->srCache)
7090 memset(dev->srCache,0,srCacheBytes);
4b070809 7091
0e8cc8bd
WJ		 7092 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7093 dev->srCache[i].object = NULL;
7094 dev->srCache[i].lastUse = 0;
7095 dev->srCache[i].dirty = 0;
7096 dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
7097 }
7098 if(!buf)
7099 init_failed = 1;
4b070809 7100
0e8cc8bd
WJ		 7101 dev->srLastUse = 0;
7102 }
7103
7104 dev->cacheHits = 0;
4b070809 7105
0e8cc8bd
WJ		 7106 if(!init_failed){
7107 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7108 if(!dev->gcCleanupList)
7109 init_failed = 1;
7110 }
7111
7112 if (dev->isYaffs2) {
7113 dev->useHeaderFileSize = 1;
7114 }
7115 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7116 init_failed = 1;
4b070809 7117
0e8cc8bd
WJ		 7118 yaffs_InitialiseTnodes(dev);
7119 yaffs_InitialiseObjects(dev);
7120
7121 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7122 init_failed = 1;
7123
7124
7125 if(!init_failed){
7126 /* Now scan the flash. */
7127 if (dev->isYaffs2) {
7128 if(yaffs_CheckpointRestore(dev)) {
7129 T(YAFFS_TRACE_ALWAYS,
7130 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7131 } else {
7132
4b070809
WD		 7133 /* Clean up the mess caused by an aborted checkpoint load
7134 * and scan backwards.
0e8cc8bd
WJ		 7135 */
7136 yaffs_DeinitialiseBlocks(dev);
7137 yaffs_DeinitialiseTnodes(dev);
7138 yaffs_DeinitialiseObjects(dev);
4b070809
WD		 7139
7140
0e8cc8bd
WJ		 7141 dev->nErasedBlocks = 0;
7142 dev->nFreeChunks = 0;
7143 dev->allocationBlock = -1;
7144 dev->allocationPage = -1;
7145 dev->nDeletedFiles = 0;
7146 dev->nUnlinkedFiles = 0;
7147 dev->nBackgroundDeletions = 0;
7148 dev->oldestDirtySequence = 0;
7149
7150 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7151 init_failed = 1;
4b070809 7152
0e8cc8bd
WJ		 7153 yaffs_InitialiseTnodes(dev);
7154 yaffs_InitialiseObjects(dev);
7155
7156 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7157 init_failed = 1;
7158
7159 if(!init_failed && !yaffs_ScanBackwards(dev))
7160 init_failed = 1;
7161 }
7162 }else
7163 if(!yaffs_Scan(dev))
7164 init_failed = 1;
7165 }
4b070809 7166
0e8cc8bd
WJ		 7167 if(init_failed){
7168 /* Clean up the mess */
7169 T(YAFFS_TRACE_TRACING,
7170 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7171
7172 yaffs_Deinitialise(dev);
7173 return YAFFS_FAIL;
7174 }
7175
7176 /* Zero out stats */
7177 dev->nPageReads = 0;
7178 dev->nPageWrites = 0;
7179 dev->nBlockErasures = 0;
7180 dev->nGCCopies = 0;
7181 dev->nRetriedWrites = 0;
7182
7183 dev->nRetiredBlocks = 0;
7184
7185 yaffs_VerifyFreeChunks(dev);
7186 yaffs_VerifyBlocks(dev);
4b070809 7187
0e8cc8bd
WJ		 7188
7189 T(YAFFS_TRACE_TRACING,
7190 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7191 return YAFFS_OK;
7192
7193}
7194
7195void yaffs_Deinitialise(yaffs_Device * dev)
7196{
7197 if (dev->isMounted) {
7198 int i;
7199
7200 yaffs_DeinitialiseBlocks(dev);
7201 yaffs_DeinitialiseTnodes(dev);
7202 yaffs_DeinitialiseObjects(dev);
7203 if (dev->nShortOpCaches > 0 &&
7204 dev->srCache) {
7205
7206 for (i = 0; i < dev->nShortOpCaches; i++) {
7207 if(dev->srCache[i].data)
7208 YFREE(dev->srCache[i].data);
7209 dev->srCache[i].data = NULL;
7210 }
7211
7212 YFREE(dev->srCache);
7213 dev->srCache = NULL;
7214 }
7215
7216 YFREE(dev->gcCleanupList);
7217
7218 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
7219 YFREE(dev->tempBuffer[i].buffer);
7220 }
7221
7222 dev->isMounted = 0;
7223 }
7224
7225}
7226
7227static int yaffs_CountFreeChunks(yaffs_Device * dev)
7228{
7229 int nFree;
7230 int b;
7231
7232 yaffs_BlockInfo *blk;
7233
7234 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7235 b++) {
7236 blk = yaffs_GetBlockInfo(dev, b);
7237
7238 switch (blk->blockState) {
7239 case YAFFS_BLOCK_STATE_EMPTY:
7240 case YAFFS_BLOCK_STATE_ALLOCATING:
7241 case YAFFS_BLOCK_STATE_COLLECTING:
7242 case YAFFS_BLOCK_STATE_FULL:
7243 nFree +=
7244 (dev->nChunksPerBlock - blk->pagesInUse +
7245 blk->softDeletions);
7246 break;
7247 default:
7248 break;
7249 }
7250
7251 }
7252
7253 return nFree;
7254}
7255
7256int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
7257{
7258 /* This is what we report to the outside world */
7259
7260 int nFree;
7261 int nDirtyCacheChunks;
7262 int blocksForCheckpoint;
7263
7264#if 1
7265 nFree = dev->nFreeChunks;
7266#else
7267 nFree = yaffs_CountFreeChunks(dev);
7268#endif
7269
7270 nFree += dev->nDeletedFiles;
4b070809 7271
0e8cc8bd
WJ		 7272 /* Now count the number of dirty chunks in the cache and subtract those */
7273
7274 {
7275 int i;
7276 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7277 if (dev->srCache[i].dirty)
7278 nDirtyCacheChunks++;
7279 }
7280 }
7281
7282 nFree -= nDirtyCacheChunks;
7283
7284 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
4b070809 7285
0e8cc8bd
WJ		 7286 /* Now we figure out how much to reserve for the checkpoint and report that... */
7287 blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
7288 if(blocksForCheckpoint < 0)
7289 blocksForCheckpoint = 0;
4b070809 7290
0e8cc8bd
WJ		 7291 nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7292
7293 if (nFree < 0)
7294 nFree = 0;
7295
7296 return nFree;
7297
7298}
7299
7300static int yaffs_freeVerificationFailures;
7301
7302static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
7303{
7304 int counted;
7305 int difference;
4b070809 7306
0e8cc8bd
WJ		 7307 if(yaffs_SkipVerification(dev))
7308 return;
4b070809 7309
0e8cc8bd
WJ		 7310 counted = yaffs_CountFreeChunks(dev);
7311
7312 difference = dev->nFreeChunks - counted;
7313
7314 if (difference) {
7315 T(YAFFS_TRACE_ALWAYS,
7316 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7317 dev->nFreeChunks, counted, difference));
7318 yaffs_freeVerificationFailures++;
7319 }
7320}
7321
7322/*---------------------------------------- YAFFS test code ----------------------*/
7323
7324#define yaffs_CheckStruct(structure,syze, name) \
4b070809 7325 if(sizeof(structure) != syze) \
0e8cc8bd 7326 { \
4b070809 7327 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
0e8cc8bd 7328 name,syze,sizeof(structure))); \
4b070809 7329 return YAFFS_FAIL; \
0e8cc8bd
WJ		 7330 }
7331
7332static int yaffs_CheckStructures(void)
7333{
7334/* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
7335/* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
7336/* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
7337#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7338 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
7339#endif
7340 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
7341
7342 return YAFFS_OK;
7343}
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