yaffs_guts.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 const char *yaffs_guts_c_version =
  15     "$Id: yaffs_guts.c,v 1.50 2007-07-18 19:40:38 charles Exp $";
  16
  17 #include "yportenv.h"
  18
  19 #include "yaffsinterface.h"
  20 #include "yaffs_guts.h"
  21 #include "yaffs_tagsvalidity.h"
  22
  23 #include "yaffs_tagscompat.h"
  24 #ifndef  CONFIG_YAFFS_USE_OWN_SORT
  25 #include "yaffs_qsort.h"
  26 #endif
  27 #include "yaffs_nand.h"
  28
  29 #include "yaffs_checkptrw.h"
  30
  31 #include "yaffs_nand.h"
  32 #include "yaffs_packedtags2.h"
  33
  34
  35 #ifdef CONFIG_YAFFS_WINCE
  36 void yfsd_LockYAFFS(BOOL fsLockOnly);
  37 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
  38 #endif
  39
  40 #define YAFFS_PASSIVE_GC_CHUNKS 2
  41
  42 #include "yaffs_ecc.h"
  43
  44
  45 /* Robustification (if it ever comes about...) */
  46 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
  47 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
  48 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
  49                                      const __u8 * data,
  50                                      const yaffs_ExtendedTags * tags);
  51 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
  52                                     const yaffs_ExtendedTags * tags);
  53
  54 /* Other local prototypes */
  55 static int yaffs_UnlinkObject( yaffs_Object *obj);
  56 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
  57
  58 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
  59
  60 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
  61                                              const __u8 * buffer,
  62                                              yaffs_ExtendedTags * tags,
  63                                              int useReserve);
  64 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
  65                                   int chunkInNAND, int inScan);
  66
  67 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
  68                                            yaffs_ObjectType type);
  69 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
  70                                        yaffs_Object * obj);
  71 static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
  72                                     int force, int isShrink, int shadows);
  73 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
  74 static int yaffs_CheckStructures(void);
  75 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
  76                               int chunkOffset, int *limit);
  77 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
  78
  79 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
  80
  81 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
  82 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
  83                                     int lineNo);
  84
  85 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
  86                                   int chunkInNAND);
  87
  88 static int yaffs_UnlinkWorker(yaffs_Object * obj);
  89 static void yaffs_DestroyObject(yaffs_Object * obj);
  90
  91 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
  92                            int chunkInObject);
  93
  94 loff_t yaffs_GetFileSize(yaffs_Object * obj);
  95
  96 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
  97
  98 static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
  99
 100 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
 101
 102 #ifdef YAFFS_PARANOID
 103 static int yaffs_CheckFileSanity(yaffs_Object * in);
 104 #else
 105 #define yaffs_CheckFileSanity(in)
 106 #endif
 107
 108 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
 109 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
 110
 111 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
 112
 113 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
 114                                  yaffs_ExtendedTags * tags);
 115
 116 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
 117 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
 118                                           yaffs_FileStructure * fStruct,
 119                                           __u32 chunkId);
 120
 121
 122 /* Function to calculate chunk and offset */
 123
 124 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
 125 {
 126         if(dev->chunkShift){
 127                 /* Easy-peasy power of 2 case */
 128                 *chunk  = (__u32)(addr >> dev->chunkShift);
 129                 *offset = (__u32)(addr & dev->chunkMask);
 130         }
 131         else if(dev->crumbsPerChunk)
 132         {
 133                 /* Case where we're using "crumbs" */
 134                 *offset = (__u32)(addr & dev->crumbMask);
 135                 addr >>= dev->crumbShift;
 136                 *chunk = ((__u32)addr)/dev->crumbsPerChunk;
 137                 *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
 138         }
 139         else
 140                 YBUG();
 141 }
 142
 143 /* Function to return the number of shifts for a power of 2 greater than or equal
 144  * to the given number
 145  * Note we don't try to cater for all possible numbers and this does not have to
 146  * be hellishly efficient.
 147  */
 148
 149 static __u32 ShiftsGE(__u32 x)
 150 {
 151         int extraBits;
 152         int nShifts;
 153
 154         nShifts = extraBits = 0;
 155
 156         while(x>1){
 157                 if(x & 1) extraBits++;
 158                 x>>=1;
 159                 nShifts++;
 160         }
 161
 162         if(extraBits)
 163                 nShifts++;
 164
 165         return nShifts;
 166 }
 167
 168 /* Function to return the number of shifts to get a 1 in bit 0
 169  */
 170
 171 static __u32 ShiftDiv(__u32 x)
 172 {
 173         int nShifts;
 174
 175         nShifts =  0;
 176
 177         if(!x) return 0;
 178
 179         while( !(x&1)){
 180                 x>>=1;
 181                 nShifts++;
 182         }
 183
 184         return nShifts;
 185 }
 186
 187
 188
 189 /*
 190  * Temporary buffer manipulations.
 191  */
 192
 193 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
 194 {
 195         int i;
 196         __u8 *buf = (__u8 *)1;
 197
 198         memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
 199
 200         for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
 201                 dev->tempBuffer[i].line = 0;    /* not in use */
 202                 dev->tempBuffer[i].buffer = buf =
 203                     YMALLOC_DMA(dev->nDataBytesPerChunk);
 204         }
 205
 206         return buf ? YAFFS_OK : YAFFS_FAIL;
 207
 208 }
 209
 210 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
 211 {
 212         int i, j;
 213         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 214                 if (dev->tempBuffer[i].line == 0) {
 215                         dev->tempBuffer[i].line = lineNo;
 216                         if ((i + 1) > dev->maxTemp) {
 217                                 dev->maxTemp = i + 1;
 218                                 for (j = 0; j <= i; j++)
 219                                         dev->tempBuffer[j].maxLine =
 220                                             dev->tempBuffer[j].line;
 221                         }
 222
 223                         return dev->tempBuffer[i].buffer;
 224                 }
 225         }
 226
 227         T(YAFFS_TRACE_BUFFERS,
 228           (TSTR("Out of temp buffers at line %d, other held by lines:"),
 229            lineNo));
 230         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 231                 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
 232         }
 233         T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 234
 235         /*
 236          * If we got here then we have to allocate an unmanaged one
 237          * This is not good.
 238          */
 239
 240         dev->unmanagedTempAllocations++;
 241         return YMALLOC(dev->nDataBytesPerChunk);
 242
 243 }
 244
 245 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
 246                                     int lineNo)
 247 {
 248         int i;
 249         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 250                 if (dev->tempBuffer[i].buffer == buffer) {
 251                         dev->tempBuffer[i].line = 0;
 252                         return;
 253                 }
 254         }
 255
 256         if (buffer) {
 257                 /* assume it is an unmanaged one. */
 258                 T(YAFFS_TRACE_BUFFERS,
 259                   (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
 260                    lineNo));
 261                 YFREE(buffer);
 262                 dev->unmanagedTempDeallocations++;
 263         }
 264
 265 }
 266
 267 /*
 268  * Determine if we have a managed buffer.
 269  */
 270 int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
 271 {
 272         int i;
 273         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 274                 if (dev->tempBuffer[i].buffer == buffer)
 275                         return 1;
 276
 277         }
 278
 279     for (i = 0; i < dev->nShortOpCaches; i++) {
 280         if( dev->srCache[i].data == buffer )
 281             return 1;
 282
 283     }
 284
 285     if (buffer == dev->checkpointBuffer)
 286       return 1;
 287
 288     T(YAFFS_TRACE_ALWAYS,
 289           (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
 290     return 0;
 291 }
 292
 293
 294
 295 /*
 296  * Chunk bitmap manipulations
 297  */
 298
 299 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
 300 {
 301         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
 302                 T(YAFFS_TRACE_ERROR,
 303                   (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
 304                    blk));
 305                 YBUG();
 306         }
 307         return dev->chunkBits +
 308             (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 309 }
 310
 311 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
 312 {
 313         if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
 314            chunk < 0 || chunk >= dev->nChunksPerBlock) {
 315            T(YAFFS_TRACE_ERROR,
 316             (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
 317             YBUG();
 318         }
 319 }
 320
 321 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
 322 {
 323         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 324
 325         memset(blkBits, 0, dev->chunkBitmapStride);
 326 }
 327
 328 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
 329 {
 330         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 331
 332         yaffs_VerifyChunkBitId(dev,blk,chunk);
 333
 334         blkBits[chunk / 8] &= ~(1 << (chunk & 7));
 335 }
 336
 337 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
 338 {
 339         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 340
 341         yaffs_VerifyChunkBitId(dev,blk,chunk);
 342
 343         blkBits[chunk / 8] |= (1 << (chunk & 7));
 344 }
 345
 346 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
 347 {
 348         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 349         yaffs_VerifyChunkBitId(dev,blk,chunk);
 350
 351         return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
 352 }
 353
 354 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
 355 {
 356         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 357         int i;
 358         for (i = 0; i < dev->chunkBitmapStride; i++) {
 359                 if (*blkBits)
 360                         return 1;
 361                 blkBits++;
 362         }
 363         return 0;
 364 }
 365
 366 static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
 367 {
 368         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 369         int i;
 370         int n = 0;
 371         for (i = 0; i < dev->chunkBitmapStride; i++) {
 372                 __u8 x = *blkBits;
 373                 while(x){
 374                         if(x & 1)
 375                                 n++;
 376                         x >>=1;
 377                 }
 378
 379                 blkBits++;
 380         }
 381         return n;
 382 }
 383
 384 /*
 385  * Verification code
 386  */
 387
 388 static int yaffs_SkipVerification(yaffs_Device *dev)
 389 {
 390         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
 391 }
 392
 393 static int yaffs_SkipFullVerification(yaffs_Device *dev)
 394 {
 395         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
 396 }
 397
 398 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
 399 {
 400         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
 401 }
 402
 403 static const char * blockStateName[] = {
 404 "Unknown",
 405 "Needs scanning",
 406 "Scanning",
 407 "Empty",
 408 "Allocating",
 409 "Full",
 410 "Dirty",
 411 "Checkpoint",
 412 "Collecting",
 413 "Dead"
 414 };
 415
 416 static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
 417 {
 418         int actuallyUsed;
 419         int inUse;
 420
 421         if(yaffs_SkipVerification(dev))
 422                 return;
 423
 424         /* Report illegal runtime states */
 425         if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
 426                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
 427
 428         switch(bi->blockState){
 429          case YAFFS_BLOCK_STATE_UNKNOWN:
 430          case YAFFS_BLOCK_STATE_SCANNING:
 431          case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
 432                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
 433                 n,blockStateName[bi->blockState]));
 434         }
 435
 436         /* Check pages in use and soft deletions are legal */
 437
 438         actuallyUsed = bi->pagesInUse - bi->softDeletions;
 439
 440         if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
 441            bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
 442            actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
 443                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
 444                 n,bi->pagesInUse,bi->softDeletions));
 445
 446
 447         /* Check chunk bitmap legal */
 448         inUse = yaffs_CountChunkBits(dev,n);
 449         if(inUse != bi->pagesInUse)
 450                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
 451                         n,bi->pagesInUse,inUse));
 452
 453         /* Check that the sequence number is valid.
 454          * Ten million is legal, but is very unlikely
 455          */
 456         if(dev->isYaffs2 &&
 457            (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
 458            (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
 459                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
 460                 n,bi->sequenceNumber));
 461
 462 }
 463
 464 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
 465 {
 466         yaffs_VerifyBlock(dev,bi,n);
 467
 468         /* After collection the block should be in the erased state */
 469         /* TODO: This will need to change if we do partial gc */
 470
 471         if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
 472                 T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
 473                         n,bi->blockState));
 474         }
 475 }
 476
 477 static void yaffs_VerifyBlocks(yaffs_Device *dev)
 478 {
 479         int i;
 480         int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
 481         int nIllegalBlockStates = 0;
 482
 483
 484         if(yaffs_SkipVerification(dev))
 485                 return;
 486
 487         memset(nBlocksPerState,0,sizeof(nBlocksPerState));
 488
 489
 490         for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
 491                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
 492                 yaffs_VerifyBlock(dev,bi,i);
 493
 494                 if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
 495                         nBlocksPerState[bi->blockState]++;
 496                 else
 497                         nIllegalBlockStates++;
 498
 499         }
 500
 501         T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
 502         T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
 503
 504         T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
 505         if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
 506                 T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
 507
 508         for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
 509                 T(YAFFS_TRACE_VERIFY,
 510                   (TSTR("%s %d blocks"TENDSTR),
 511                   blockStateName[i],nBlocksPerState[i]));
 512
 513         if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
 514                 T(YAFFS_TRACE_VERIFY,
 515                  (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
 516                  dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
 517
 518         if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
 519                 T(YAFFS_TRACE_VERIFY,
 520                  (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
 521                  dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
 522
 523         if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
 524                 T(YAFFS_TRACE_VERIFY,
 525                  (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
 526                  nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
 527
 528         T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
 529
 530 }
 531
 532 /*
 533  * Verify the object header. oh must be valid, but obj and tags may be NULL in which
 534  * case those tests will not be performed.
 535  */
 536 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
 537 {
 538         if(yaffs_SkipVerification(obj->myDev))
 539                 return;
 540
 541         if(!(tags && obj && oh)){
 542                 T(YAFFS_TRACE_VERIFY,
 543                                 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
 544                                 (__u32)tags,(__u32)obj,(__u32)oh));
 545                 return;
 546         }
 547
 548         if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
 549            oh->type > YAFFS_OBJECT_TYPE_MAX)
 550                 T(YAFFS_TRACE_VERIFY,
 551                  (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
 552                  tags->objectId, oh->type));
 553
 554         if(tags->objectId != obj->objectId)
 555                 T(YAFFS_TRACE_VERIFY,
 556                  (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
 557                  tags->objectId, obj->objectId));
 558
 559
 560         /*
 561          * Check that the object's parent ids match if parentCheck requested.
 562          *
 563          * Tests do not apply to the root object.
 564          */
 565
 566         if(parentCheck && tags->objectId > 1 && !obj->parent)
 567                 T(YAFFS_TRACE_VERIFY,
 568                  (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
 569                  tags->objectId, oh->parentObjectId));
 570
 571
 572         if(parentCheck && obj->parent &&
 573            oh->parentObjectId != obj->parent->objectId &&
 574            (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
 575             obj->parent->objectId != YAFFS_OBJECTID_DELETED))
 576                 T(YAFFS_TRACE_VERIFY,
 577                  (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
 578                  tags->objectId, oh->parentObjectId, obj->parent->objectId));
 579
 580
 581         if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
 582                 T(YAFFS_TRACE_VERIFY,
 583                 (TSTR("Obj %d header name is NULL"TENDSTR),
 584                  obj->objectId));
 585
 586         if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
 587                 T(YAFFS_TRACE_VERIFY,
 588                 (TSTR("Obj %d header name is 0xFF"TENDSTR),
 589                  obj->objectId));
 590 }
 591
 592
 593
 594 static int yaffs_VerifyTnodeWorker(yaffs_Object * obj, yaffs_Tnode * tn,
 595                                         __u32 level, int chunkOffset)
 596 {
 597         int i;
 598         yaffs_Device *dev = obj->myDev;
 599         int ok = 1;
 600         int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
 601
 602         if (tn) {
 603                 if (level > 0) {
 604
 605                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
 606                                 if (tn->internal[i]) {
 607                                         ok = yaffs_VerifyTnodeWorker(obj,
 608                                                         tn->internal[i],
 609                                                         level - 1,
 610                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
 611                                 }
 612                         }
 613                 } else if (level == 0) {
 614                         int i;
 615                         yaffs_ExtendedTags tags;
 616                         __u32 objectId = obj->objectId;
 617
 618                         chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
 619
 620                         for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){
 621                                 __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
 622
 623                                 if(theChunk > 0){
 624                                         /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
 625                                         yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
 626                                         if(tags.objectId != objectId || tags.chunkId != chunkOffset){
 627                                                 T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 628                                                         objectId, chunkOffset, theChunk,
 629                                                         tags.objectId, tags.chunkId));
 630                                         }
 631                                 }
 632                                 chunkOffset++;
 633                         }
 634                 }
 635         }
 636
 637         return ok;
 638
 639 }
 640
 641
 642 static void yaffs_VerifyFile(yaffs_Object *obj)
 643 {
 644         int requiredTallness;
 645         int actualTallness;
 646         __u32 lastChunk;
 647         __u32 x;
 648         __u32 i;
 649         int ok;
 650         yaffs_Device *dev;
 651         yaffs_ExtendedTags tags;
 652         yaffs_Tnode *tn;
 653         __u32 objectId;
 654
 655         if(obj && yaffs_SkipVerification(obj->myDev))
 656                 return;
 657
 658         dev = obj->myDev;
 659         objectId = obj->objectId;
 660
 661         /* Check file size is consistent with tnode depth */
 662         lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
 663         x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
 664         requiredTallness = 0;
 665         while (x> 0) {
 666                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 667                 requiredTallness++;
 668         }
 669
 670         actualTallness = obj->variant.fileVariant.topLevel;
 671
 672         if(requiredTallness > actualTallness )
 673                 T(YAFFS_TRACE_VERIFY,
 674                 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
 675                  obj->objectId,actualTallness, requiredTallness));
 676
 677
 678         /* Check that the chunks in the tnode tree are all correct.
 679          * We do this by scanning through the tnode tree and
 680          * checking the tags for every chunk match.
 681          */
 682
 683         if(yaffs_SkipNANDVerification(dev))
 684                 return;
 685
 686         for(i = 1; i <= lastChunk; i++){
 687                 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
 688
 689                 if (tn) {
 690                         __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
 691                         if(theChunk > 0){
 692                                 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
 693                                 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
 694                                 if(tags.objectId != objectId || tags.chunkId != i){
 695                                         T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 696                                                 objectId, i, theChunk,
 697                                                 tags.objectId, tags.chunkId));
 698                                 }
 699                         }
 700                 }
 701
 702         }
 703
 704 }
 705
 706 static void yaffs_VerifyDirectory(yaffs_Object *obj)
 707 {
 708         if(obj && yaffs_SkipVerification(obj->myDev))
 709                 return;
 710
 711 }
 712
 713 static void yaffs_VerifyHardLink(yaffs_Object *obj)
 714 {
 715         if(obj && yaffs_SkipVerification(obj->myDev))
 716                 return;
 717
 718         /* Verify sane equivalent object */
 719 }
 720
 721 static void yaffs_VerifySymlink(yaffs_Object *obj)
 722 {
 723         if(obj && yaffs_SkipVerification(obj->myDev))
 724                 return;
 725
 726         /* Verify symlink string */
 727 }
 728
 729 static void yaffs_VerifySpecial(yaffs_Object *obj)
 730 {
 731         if(obj && yaffs_SkipVerification(obj->myDev))
 732                 return;
 733 }
 734
 735 static void yaffs_VerifyObject(yaffs_Object *obj)
 736 {
 737         yaffs_Device *dev;
 738
 739         __u32 chunkMin;
 740         __u32 chunkMax;
 741
 742         __u32 chunkIdOk;
 743         __u32 chunkIsLive;
 744
 745         if(!obj)
 746                 return;
 747
 748         dev = obj->myDev;
 749
 750         if(yaffs_SkipVerification(dev))
 751                 return;
 752
 753         /* Check sane object header chunk */
 754
 755         chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
 756         chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
 757
 758         chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
 759         chunkIsLive = chunkIdOk &&
 760                         yaffs_CheckChunkBit(dev,
 761                                             obj->chunkId / dev->nChunksPerBlock,
 762                                             obj->chunkId % dev->nChunksPerBlock);
 763         if(!obj->fake &&
 764             (!chunkIdOk || !chunkIsLive)) {
 765            T(YAFFS_TRACE_VERIFY,
 766            (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
 767            obj->objectId,obj->chunkId,
 768            chunkIdOk ? "" : ",out of range",
 769            chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
 770         }
 771
 772         if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
 773                 yaffs_ExtendedTags tags;
 774                 yaffs_ObjectHeader *oh;
 775                 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
 776
 777                 oh = (yaffs_ObjectHeader *)buffer;
 778
 779                 yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
 780
 781                 yaffs_VerifyObjectHeader(obj,oh,&tags,1);
 782
 783                 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
 784         }
 785
 786         /* Verify it has a parent */
 787         if(obj && !obj->fake &&
 788            (!obj->parent || obj->parent->myDev != dev)){
 789            T(YAFFS_TRACE_VERIFY,
 790            (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
 791            obj->objectId,obj->parent));
 792         }
 793
 794         /* Verify parent is a directory */
 795         if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
 796            T(YAFFS_TRACE_VERIFY,
 797            (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
 798            obj->objectId,obj->parent->variantType));
 799         }
 800
 801         switch(obj->variantType){
 802         case YAFFS_OBJECT_TYPE_FILE:
 803                 yaffs_VerifyFile(obj);
 804                 break;
 805         case YAFFS_OBJECT_TYPE_SYMLINK:
 806                 yaffs_VerifySymlink(obj);
 807                 break;
 808         case YAFFS_OBJECT_TYPE_DIRECTORY:
 809                 yaffs_VerifyDirectory(obj);
 810                 break;
 811         case YAFFS_OBJECT_TYPE_HARDLINK:
 812                 yaffs_VerifyHardLink(obj);
 813                 break;
 814         case YAFFS_OBJECT_TYPE_SPECIAL:
 815                 yaffs_VerifySpecial(obj);
 816                 break;
 817         case YAFFS_OBJECT_TYPE_UNKNOWN:
 818         default:
 819                 T(YAFFS_TRACE_VERIFY,
 820                 (TSTR("Obj %d has illegaltype %d"TENDSTR),
 821                 obj->objectId,obj->variantType));
 822                 break;
 823         }
 824
 825
 826 }
 827
 828 static void yaffs_VerifyObjects(yaffs_Device *dev)
 829 {
 830         yaffs_Object *obj;
 831         int i;
 832         struct list_head *lh;
 833
 834         if(yaffs_SkipVerification(dev))
 835                 return;
 836
 837         /* Iterate through the objects in each hash entry */
 838
 839          for(i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++){
 840                 list_for_each(lh, &dev->objectBucket[i].list) {
 841                         if (lh) {
 842                                 obj = list_entry(lh, yaffs_Object, hashLink);
 843                                 yaffs_VerifyObject(obj);
 844                         }
 845                 }
 846          }
 847
 848 }
 849
 850
 851 /*
 852  *  Simple hash function. Needs to have a reasonable spread
 853  */
 854
 855 static Y_INLINE int yaffs_HashFunction(int n)
 856 {
 857         n = abs(n);
 858         return (n % YAFFS_NOBJECT_BUCKETS);
 859 }
 860
 861 /*
 862  * Access functions to useful fake objects
 863  */
 864
 865 yaffs_Object *yaffs_Root(yaffs_Device * dev)
 866 {
 867         return dev->rootDir;
 868 }
 869
 870 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
 871 {
 872         return dev->lostNFoundDir;
 873 }
 874
 875
 876 /*
 877  *  Erased NAND checking functions
 878  */
 879
 880 int yaffs_CheckFF(__u8 * buffer, int nBytes)
 881 {
 882         /* Horrible, slow implementation */
 883         while (nBytes--) {
 884                 if (*buffer != 0xFF)
 885                         return 0;
 886                 buffer++;
 887         }
 888         return 1;
 889 }
 890
 891 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 892                                   int chunkInNAND)
 893 {
 894
 895         int retval = YAFFS_OK;
 896         __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
 897         yaffs_ExtendedTags tags;
 898         int result;
 899
 900         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 901
 902         if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
 903                 retval = YAFFS_FAIL;
 904
 905
 906         if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
 907                 T(YAFFS_TRACE_NANDACCESS,
 908                   (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
 909                 retval = YAFFS_FAIL;
 910         }
 911
 912         yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 913
 914         return retval;
 915
 916 }
 917
 918 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 919                                              const __u8 * data,
 920                                              yaffs_ExtendedTags * tags,
 921                                              int useReserve)
 922 {
 923         int attempts = 0;
 924         int writeOk = 0;
 925         int chunk;
 926
 927         yaffs_InvalidateCheckpoint(dev);
 928
 929         do {
 930                 yaffs_BlockInfo *bi = 0;
 931                 int erasedOk = 0;
 932
 933                 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
 934                 if (chunk < 0) {
 935                         /* no space */
 936                         break;
 937                 }
 938
 939                 /* First check this chunk is erased, if it needs
 940                  * checking.  The checking policy (unless forced
 941                  * always on) is as follows:
 942                  *
 943                  * Check the first page we try to write in a block.
 944                  * If the check passes then we don't need to check any
 945                  * more.        If the check fails, we check again...
 946                  * If the block has been erased, we don't need to check.
 947                  *
 948                  * However, if the block has been prioritised for gc,
 949                  * then we think there might be something odd about
 950                  * this block and stop using it.
 951                  *
 952                  * Rationale: We should only ever see chunks that have
 953                  * not been erased if there was a partially written
 954                  * chunk due to power loss.  This checking policy should
 955                  * catch that case with very few checks and thus save a
 956                  * lot of checks that are most likely not needed.
 957                  */
 958                 if (bi->gcPrioritise) {
 959                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
 960                         /* try another chunk */
 961                         continue;
 962                 }
 963
 964                 /* let's give it a try */
 965                 attempts++;
 966
 967 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
 968                 bi->skipErasedCheck = 0;
 969 #endif
 970                 if (!bi->skipErasedCheck) {
 971                         erasedOk = yaffs_CheckChunkErased(dev, chunk);
 972                         if (erasedOk != YAFFS_OK) {
 973                                 T(YAFFS_TRACE_ERROR,
 974                                 (TSTR ("**>> yaffs chunk %d was not erased"
 975                                 TENDSTR), chunk));
 976
 977                                 /* try another chunk */
 978                                 continue;
 979                         }
 980                         bi->skipErasedCheck = 1;
 981                 }
 982
 983                 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
 984                                 data, tags);
 985                 if (writeOk != YAFFS_OK) {
 986                         yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
 987                         /* try another chunk */
 988                         continue;
 989                 }
 990
 991                 /* Copy the data into the robustification buffer */
 992                 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
 993
 994         } while (writeOk != YAFFS_OK &&
 995                 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
 996
 997         if(!writeOk)
 998                 chunk = -1;
 999
1000         if (attempts > 1) {
1001                 T(YAFFS_TRACE_ERROR,
1002                         (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1003                         attempts));
1004
1005                 dev->nRetriedWrites += (attempts - 1);
1006         }
1007
1008         return chunk;
1009 }
1010
1011 /*
1012  * Block retiring for handling a broken block.
1013  */
1014
1015 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
1016 {
1017         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1018
1019         yaffs_InvalidateCheckpoint(dev);
1020
1021         yaffs_MarkBlockBad(dev, blockInNAND);
1022
1023         bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1024         bi->gcPrioritise = 0;
1025         bi->needsRetiring = 0;
1026
1027         dev->nRetiredBlocks++;
1028 }
1029
1030 /*
1031  * Functions for robustisizing TODO
1032  *
1033  */
1034
1035 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
1036                                      const __u8 * data,
1037                                      const yaffs_ExtendedTags * tags)
1038 {
1039 }
1040
1041 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
1042                                     const yaffs_ExtendedTags * tags)
1043 {
1044 }
1045
1046 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1047 {
1048         if(!bi->gcPrioritise){
1049                 bi->gcPrioritise = 1;
1050                 dev->hasPendingPrioritisedGCs = 1;
1051                 bi->chunkErrorStrikes ++;
1052
1053                 if(bi->chunkErrorStrikes > 3){
1054                         bi->needsRetiring = 1; /* Too many stikes, so retire this */
1055                         T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1056
1057                 }
1058
1059         }
1060 }
1061
1062 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
1063 {
1064
1065         int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1066         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1067
1068         yaffs_HandleChunkError(dev,bi);
1069
1070
1071         if(erasedOk ) {
1072                 /* Was an actual write failure, so mark the block for retirement  */
1073                 bi->needsRetiring = 1;
1074                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1075                   (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1076
1077
1078         }
1079
1080         /* Delete the chunk */
1081         yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1082 }
1083
1084
1085 /*---------------- Name handling functions ------------*/
1086
1087 static __u16 yaffs_CalcNameSum(const YCHAR * name)
1088 {
1089         __u16 sum = 0;
1090         __u16 i = 1;
1091
1092         YUCHAR *bname = (YUCHAR *) name;
1093         if (bname) {
1094                 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1095
1096 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1097                         sum += yaffs_toupper(*bname) * i;
1098 #else
1099                         sum += (*bname) * i;
1100 #endif
1101                         i++;
1102                         bname++;
1103                 }
1104         }
1105         return sum;
1106 }
1107
1108 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
1109 {
1110 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1111         if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
1112                 yaffs_strcpy(obj->shortName, name);
1113         } else {
1114                 obj->shortName[0] = _Y('\0');
1115         }
1116 #endif
1117         obj->sum = yaffs_CalcNameSum(name);
1118 }
1119
1120 /*-------------------- TNODES -------------------
1121
1122  * List of spare tnodes
1123  * The list is hooked together using the first pointer
1124  * in the tnode.
1125  */
1126
1127 /* yaffs_CreateTnodes creates a bunch more tnodes and
1128  * adds them to the tnode free list.
1129  * Don't use this function directly
1130  */
1131
1132 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
1133 {
1134         int i;
1135         int tnodeSize;
1136         yaffs_Tnode *newTnodes;
1137         __u8 *mem;
1138         yaffs_Tnode *curr;
1139         yaffs_Tnode *next;
1140         yaffs_TnodeList *tnl;
1141
1142         if (nTnodes < 1)
1143                 return YAFFS_OK;
1144
1145         /* Calculate the tnode size in bytes for variable width tnode support.
1146          * Must be a multiple of 32-bits  */
1147         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1148
1149         /* make these things */
1150
1151         newTnodes = YMALLOC(nTnodes * tnodeSize);
1152         mem = (__u8 *)newTnodes;
1153
1154         if (!newTnodes) {
1155                 T(YAFFS_TRACE_ERROR,
1156                   (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1157                 return YAFFS_FAIL;
1158         }
1159
1160         /* Hook them into the free list */
1161 #if 0
1162         for (i = 0; i < nTnodes - 1; i++) {
1163                 newTnodes[i].internal[0] = &newTnodes[i + 1];
1164 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1165                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1166 #endif
1167         }
1168
1169         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1170 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1171         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1172 #endif
1173         dev->freeTnodes = newTnodes;
1174 #else
1175         /* New hookup for wide tnodes */
1176         for(i = 0; i < nTnodes -1; i++) {
1177                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1178                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1179                 curr->internal[0] = next;
1180         }
1181
1182         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1183         curr->internal[0] = dev->freeTnodes;
1184         dev->freeTnodes = (yaffs_Tnode *)mem;
1185
1186 #endif
1187
1188
1189         dev->nFreeTnodes += nTnodes;
1190         dev->nTnodesCreated += nTnodes;
1191
1192         /* Now add this bunch of tnodes to a list for freeing up.
1193          * NB If we can't add this to the management list it isn't fatal
1194          * but it just means we can't free this bunch of tnodes later.
1195          */
1196
1197         tnl = YMALLOC(sizeof(yaffs_TnodeList));
1198         if (!tnl) {
1199                 T(YAFFS_TRACE_ERROR,
1200                   (TSTR
1201                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
1202                    return YAFFS_FAIL;
1203
1204         } else {
1205                 tnl->tnodes = newTnodes;
1206                 tnl->next = dev->allocatedTnodeList;
1207                 dev->allocatedTnodeList = tnl;
1208         }
1209
1210         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1211
1212         return YAFFS_OK;
1213 }
1214
1215 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1216
1217 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
1218 {
1219         yaffs_Tnode *tn = NULL;
1220
1221         /* If there are none left make more */
1222         if (!dev->freeTnodes) {
1223                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1224         }
1225
1226         if (dev->freeTnodes) {
1227                 tn = dev->freeTnodes;
1228 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1229                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1230                         /* Hoosterman, this thing looks like it isn't in the list */
1231                         T(YAFFS_TRACE_ALWAYS,
1232                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1233                 }
1234 #endif
1235                 dev->freeTnodes = dev->freeTnodes->internal[0];
1236                 dev->nFreeTnodes--;
1237         }
1238
1239         return tn;
1240 }
1241
1242 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
1243 {
1244         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1245
1246         if(tn)
1247                 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1248
1249         return tn;
1250 }
1251
1252 /* FreeTnode frees up a tnode and puts it back on the free list */
1253 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
1254 {
1255         if (tn) {
1256 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1257                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1258                         /* Hoosterman, this thing looks like it is already in the list */
1259                         T(YAFFS_TRACE_ALWAYS,
1260                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1261                 }
1262                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1263 #endif
1264                 tn->internal[0] = dev->freeTnodes;
1265                 dev->freeTnodes = tn;
1266                 dev->nFreeTnodes++;
1267         }
1268 }
1269
1270 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
1271 {
1272         /* Free the list of allocated tnodes */
1273         yaffs_TnodeList *tmp;
1274
1275         while (dev->allocatedTnodeList) {
1276                 tmp = dev->allocatedTnodeList->next;
1277
1278                 YFREE(dev->allocatedTnodeList->tnodes);
1279                 YFREE(dev->allocatedTnodeList);
1280                 dev->allocatedTnodeList = tmp;
1281
1282         }
1283
1284         dev->freeTnodes = NULL;
1285         dev->nFreeTnodes = 0;
1286 }
1287
1288 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
1289 {
1290         dev->allocatedTnodeList = NULL;
1291         dev->freeTnodes = NULL;
1292         dev->nFreeTnodes = 0;
1293         dev->nTnodesCreated = 0;
1294
1295 }
1296
1297
1298 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
1299 {
1300   __u32 *map = (__u32 *)tn;
1301   __u32 bitInMap;
1302   __u32 bitInWord;
1303   __u32 wordInMap;
1304   __u32 mask;
1305
1306   pos &= YAFFS_TNODES_LEVEL0_MASK;
1307   val >>= dev->chunkGroupBits;
1308
1309   bitInMap = pos * dev->tnodeWidth;
1310   wordInMap = bitInMap /32;
1311   bitInWord = bitInMap & (32 -1);
1312
1313   mask = dev->tnodeMask << bitInWord;
1314
1315   map[wordInMap] &= ~mask;
1316   map[wordInMap] |= (mask & (val << bitInWord));
1317
1318   if(dev->tnodeWidth > (32-bitInWord)) {
1319     bitInWord = (32 - bitInWord);
1320     wordInMap++;;
1321     mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1322     map[wordInMap] &= ~mask;
1323     map[wordInMap] |= (mask & (val >> bitInWord));
1324   }
1325 }
1326
1327 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
1328 {
1329   __u32 *map = (__u32 *)tn;
1330   __u32 bitInMap;
1331   __u32 bitInWord;
1332   __u32 wordInMap;
1333   __u32 val;
1334
1335   pos &= YAFFS_TNODES_LEVEL0_MASK;
1336
1337   bitInMap = pos * dev->tnodeWidth;
1338   wordInMap = bitInMap /32;
1339   bitInWord = bitInMap & (32 -1);
1340
1341   val = map[wordInMap] >> bitInWord;
1342
1343   if(dev->tnodeWidth > (32-bitInWord)) {
1344     bitInWord = (32 - bitInWord);
1345     wordInMap++;;
1346     val |= (map[wordInMap] << bitInWord);
1347   }
1348
1349   val &= dev->tnodeMask;
1350   val <<= dev->chunkGroupBits;
1351
1352   return val;
1353 }
1354
1355 /* ------------------- End of individual tnode manipulation -----------------*/
1356
1357 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1358  * The look up tree is represented by the top tnode and the number of topLevel
1359  * in the tree. 0 means only the level 0 tnode is in the tree.
1360  */
1361
1362 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1363 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
1364                                           yaffs_FileStructure * fStruct,
1365                                           __u32 chunkId)
1366 {
1367
1368         yaffs_Tnode *tn = fStruct->top;
1369         __u32 i;
1370         int requiredTallness;
1371         int level = fStruct->topLevel;
1372
1373         /* Check sane level and chunk Id */
1374         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
1375                 return NULL;
1376         }
1377
1378         if (chunkId > YAFFS_MAX_CHUNK_ID) {
1379                 return NULL;
1380         }
1381
1382         /* First check we're tall enough (ie enough topLevel) */
1383
1384         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1385         requiredTallness = 0;
1386         while (i) {
1387                 i >>= YAFFS_TNODES_INTERNAL_BITS;
1388                 requiredTallness++;
1389         }
1390
1391         if (requiredTallness > fStruct->topLevel) {
1392                 /* Not tall enough, so we can't find it, return NULL. */
1393                 return NULL;
1394         }
1395
1396         /* Traverse down to level 0 */
1397         while (level > 0 && tn) {
1398                 tn = tn->
1399                     internal[(chunkId >>
1400                                ( YAFFS_TNODES_LEVEL0_BITS +
1401                                  (level - 1) *
1402                                  YAFFS_TNODES_INTERNAL_BITS)
1403                               ) &
1404                              YAFFS_TNODES_INTERNAL_MASK];
1405                 level--;
1406
1407         }
1408
1409         return tn;
1410 }
1411
1412 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1413  * This happens in two steps:
1414  *  1. If the tree isn't tall enough, then make it taller.
1415  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1416  *
1417  * Used when modifying the tree.
1418  *
1419  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1420  *  be plugged into the ttree.
1421  */
1422
1423 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
1424                                                yaffs_FileStructure * fStruct,
1425                                                __u32 chunkId,
1426                                                yaffs_Tnode *passedTn)
1427 {
1428
1429         int requiredTallness;
1430         int i;
1431         int l;
1432         yaffs_Tnode *tn;
1433
1434         __u32 x;
1435
1436
1437         /* Check sane level and page Id */
1438         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
1439                 return NULL;
1440         }
1441
1442         if (chunkId > YAFFS_MAX_CHUNK_ID) {
1443                 return NULL;
1444         }
1445
1446         /* First check we're tall enough (ie enough topLevel) */
1447
1448         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1449         requiredTallness = 0;
1450         while (x) {
1451                 x >>= YAFFS_TNODES_INTERNAL_BITS;
1452                 requiredTallness++;
1453         }
1454
1455
1456         if (requiredTallness > fStruct->topLevel) {
1457                 /* Not tall enough,gotta make the tree taller */
1458                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1459
1460                         tn = yaffs_GetTnode(dev);
1461
1462                         if (tn) {
1463                                 tn->internal[0] = fStruct->top;
1464                                 fStruct->top = tn;
1465                         } else {
1466                                 T(YAFFS_TRACE_ERROR,
1467                                   (TSTR("yaffs: no more tnodes" TENDSTR)));
1468                         }
1469                 }
1470
1471                 fStruct->topLevel = requiredTallness;
1472         }
1473
1474         /* Traverse down to level 0, adding anything we need */
1475
1476         l = fStruct->topLevel;
1477         tn = fStruct->top;
1478
1479         if(l > 0) {
1480                 while (l > 0 && tn) {
1481                         x = (chunkId >>
1482                              ( YAFFS_TNODES_LEVEL0_BITS +
1483                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1484                             YAFFS_TNODES_INTERNAL_MASK;
1485
1486
1487                         if((l>1) && !tn->internal[x]){
1488                                 /* Add missing non-level-zero tnode */
1489                                 tn->internal[x] = yaffs_GetTnode(dev);
1490
1491                         } else if(l == 1) {
1492                                 /* Looking from level 1 at level 0 */
1493                                 if (passedTn) {
1494                                         /* If we already have one, then release it.*/
1495                                         if(tn->internal[x])
1496                                                 yaffs_FreeTnode(dev,tn->internal[x]);
1497                                         tn->internal[x] = passedTn;
1498
1499                                 } else if(!tn->internal[x]) {
1500                                         /* Don't have one, none passed in */
1501                                         tn->internal[x] = yaffs_GetTnode(dev);
1502                                 }
1503                         }
1504
1505                         tn = tn->internal[x];
1506                         l--;
1507                 }
1508         } else {
1509                 /* top is level 0 */
1510                 if(passedTn) {
1511                         memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1512                         yaffs_FreeTnode(dev,passedTn);
1513                 }
1514         }
1515
1516         return tn;
1517 }
1518
1519 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
1520                                   yaffs_ExtendedTags * tags, int objectId,
1521                                   int chunkInInode)
1522 {
1523         int j;
1524
1525         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1526                 if (yaffs_CheckChunkBit
1527                     (dev, theChunk / dev->nChunksPerBlock,
1528                      theChunk % dev->nChunksPerBlock)) {
1529                         yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1530                                                         tags);
1531                         if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1532                                 /* found it; */
1533                                 return theChunk;
1534
1535                         }
1536                 }
1537                 theChunk++;
1538         }
1539         return -1;
1540 }
1541
1542
1543 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1544  * chunks and tnodes in the file
1545  * Returns 1 if the tree was deleted.
1546  * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1547  */
1548
1549 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
1550                               int chunkOffset, int *limit)
1551 {
1552         int i;
1553         int chunkInInode;
1554         int theChunk;
1555         yaffs_ExtendedTags tags;
1556         int foundChunk;
1557         yaffs_Device *dev = in->myDev;
1558
1559         int allDone = 1;
1560
1561         if (tn) {
1562                 if (level > 0) {
1563
1564                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1565                              i--) {
1566                                 if (tn->internal[i]) {
1567                                         if (limit && (*limit) < 0) {
1568                                                 allDone = 0;
1569                                         } else {
1570                                                 allDone =
1571                                                     yaffs_DeleteWorker(in,
1572                                                                        tn->
1573                                                                        internal
1574                                                                        [i],
1575                                                                        level -
1576                                                                        1,
1577                                                                        (chunkOffset
1578                                                                         <<
1579                                                                         YAFFS_TNODES_INTERNAL_BITS)
1580                                                                        + i,
1581                                                                        limit);
1582                                         }
1583                                         if (allDone) {
1584                                                 yaffs_FreeTnode(dev,
1585                                                                 tn->
1586                                                                 internal[i]);
1587                                                 tn->internal[i] = NULL;
1588                                         }
1589                                 }
1590
1591                         }
1592                         return (allDone) ? 1 : 0;
1593                 } else if (level == 0) {
1594                         int hitLimit = 0;
1595
1596                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1597                              i--) {
1598                                 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1599                                 if (theChunk) {
1600
1601                                         chunkInInode =
1602                                             (chunkOffset <<
1603                                              YAFFS_TNODES_LEVEL0_BITS) + i;
1604
1605                                         foundChunk =
1606                                             yaffs_FindChunkInGroup(dev,
1607                                                                    theChunk,
1608                                                                    &tags,
1609                                                                    in->objectId,
1610                                                                    chunkInInode);
1611
1612                                         if (foundChunk > 0) {
1613                                                 yaffs_DeleteChunk(dev,
1614                                                                   foundChunk, 1,
1615                                                                   __LINE__);
1616                                                 in->nDataChunks--;
1617                                                 if (limit) {
1618                                                         *limit = *limit - 1;
1619                                                         if (*limit <= 0) {
1620                                                                 hitLimit = 1;
1621                                                         }
1622                                                 }
1623
1624                                         }
1625
1626                                         yaffs_PutLevel0Tnode(dev,tn,i,0);
1627                                 }
1628
1629                         }
1630                         return (i < 0) ? 1 : 0;
1631
1632                 }
1633
1634         }
1635
1636         return 1;
1637
1638 }
1639
1640 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1641 {
1642
1643         yaffs_BlockInfo *theBlock;
1644
1645         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1646
1647         theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1648         if (theBlock) {
1649                 theBlock->softDeletions++;
1650                 dev->nFreeChunks++;
1651         }
1652 }
1653
1654 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1655  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1656  * of the tnode.
1657  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1658  */
1659
1660 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1661                                   __u32 level, int chunkOffset)
1662 {
1663         int i;
1664         int theChunk;
1665         int allDone = 1;
1666         yaffs_Device *dev = in->myDev;
1667
1668         if (tn) {
1669                 if (level > 0) {
1670
1671                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1672                              i--) {
1673                                 if (tn->internal[i]) {
1674                                         allDone =
1675                                             yaffs_SoftDeleteWorker(in,
1676                                                                    tn->
1677                                                                    internal[i],
1678                                                                    level - 1,
1679                                                                    (chunkOffset
1680                                                                     <<
1681                                                                     YAFFS_TNODES_INTERNAL_BITS)
1682                                                                    + i);
1683                                         if (allDone) {
1684                                                 yaffs_FreeTnode(dev,
1685                                                                 tn->
1686                                                                 internal[i]);
1687                                                 tn->internal[i] = NULL;
1688                                         } else {
1689                                                 /* Hoosterman... how could this happen? */
1690                                         }
1691                                 }
1692                         }
1693                         return (allDone) ? 1 : 0;
1694                 } else if (level == 0) {
1695
1696                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1697                                 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1698                                 if (theChunk) {
1699                                         /* Note this does not find the real chunk, only the chunk group.
1700                                          * We make an assumption that a chunk group is not larger than
1701                                          * a block.
1702                                          */
1703                                         yaffs_SoftDeleteChunk(dev, theChunk);
1704                                         yaffs_PutLevel0Tnode(dev,tn,i,0);
1705                                 }
1706
1707                         }
1708                         return 1;
1709
1710                 }
1711
1712         }
1713
1714         return 1;
1715
1716 }
1717
1718 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1719 {
1720         if (obj->deleted &&
1721             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1722                 if (obj->nDataChunks <= 0) {
1723                         /* Empty file with no duplicate object headers, just delete it immediately */
1724                         yaffs_FreeTnode(obj->myDev,
1725                                         obj->variant.fileVariant.top);
1726                         obj->variant.fileVariant.top = NULL;
1727                         T(YAFFS_TRACE_TRACING,
1728                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1729                            obj->objectId));
1730                         yaffs_DoGenericObjectDeletion(obj);
1731                 } else {
1732                         yaffs_SoftDeleteWorker(obj,
1733                                                obj->variant.fileVariant.top,
1734                                                obj->variant.fileVariant.
1735                                                topLevel, 0);
1736                         obj->softDeleted = 1;
1737                 }
1738         }
1739 }
1740
1741 /* Pruning removes any part of the file structure tree that is beyond the
1742  * bounds of the file (ie that does not point to chunks).
1743  *
1744  * A file should only get pruned when its size is reduced.
1745  *
1746  * Before pruning, the chunks must be pulled from the tree and the
1747  * level 0 tnode entries must be zeroed out.
1748  * Could also use this for file deletion, but that's probably better handled
1749  * by a special case.
1750  */
1751
1752 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1753                                       __u32 level, int del0)
1754 {
1755         int i;
1756         int hasData;
1757
1758         if (tn) {
1759                 hasData = 0;
1760
1761                 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1762                         if (tn->internal[i] && level > 0) {
1763                                 tn->internal[i] =
1764                                     yaffs_PruneWorker(dev, tn->internal[i],
1765                                                       level - 1,
1766                                                       (i == 0) ? del0 : 1);
1767                         }
1768
1769                         if (tn->internal[i]) {
1770                                 hasData++;
1771                         }
1772                 }
1773
1774                 if (hasData == 0 && del0) {
1775                         /* Free and return NULL */
1776
1777                         yaffs_FreeTnode(dev, tn);
1778                         tn = NULL;
1779                 }
1780
1781         }
1782
1783         return tn;
1784
1785 }
1786
1787 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1788                                     yaffs_FileStructure * fStruct)
1789 {
1790         int i;
1791         int hasData;
1792         int done = 0;
1793         yaffs_Tnode *tn;
1794
1795         if (fStruct->topLevel > 0) {
1796                 fStruct->top =
1797                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1798
1799                 /* Now we have a tree with all the non-zero branches NULL but the height
1800                  * is the same as it was.
1801                  * Let's see if we can trim internal tnodes to shorten the tree.
1802                  * We can do this if only the 0th element in the tnode is in use
1803                  * (ie all the non-zero are NULL)
1804                  */
1805
1806                 while (fStruct->topLevel && !done) {
1807                         tn = fStruct->top;
1808
1809                         hasData = 0;
1810                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1811                                 if (tn->internal[i]) {
1812                                         hasData++;
1813                                 }
1814                         }
1815
1816                         if (!hasData) {
1817                                 fStruct->top = tn->internal[0];
1818                                 fStruct->topLevel--;
1819                                 yaffs_FreeTnode(dev, tn);
1820                         } else {
1821                                 done = 1;
1822                         }
1823                 }
1824         }
1825
1826         return YAFFS_OK;
1827 }
1828
1829 /*-------------------- End of File Structure functions.-------------------*/
1830
1831 /* yaffs_CreateFreeObjects creates a bunch more objects and
1832  * adds them to the object free list.
1833  */
1834 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1835 {
1836         int i;
1837         yaffs_Object *newObjects;
1838         yaffs_ObjectList *list;
1839
1840         if (nObjects < 1)
1841                 return YAFFS_OK;
1842
1843         /* make these things */
1844         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1845         list = YMALLOC(sizeof(yaffs_ObjectList));
1846
1847         if (!newObjects || !list) {
1848                 if(newObjects)
1849                         YFREE(newObjects);
1850                 if(list)
1851                         YFREE(list);
1852                 T(YAFFS_TRACE_ALLOCATE,
1853                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1854                 return YAFFS_FAIL;
1855         }
1856
1857         /* Hook them into the free list */
1858         for (i = 0; i < nObjects - 1; i++) {
1859                 newObjects[i].siblings.next =
1860                     (struct list_head *)(&newObjects[i + 1]);
1861         }
1862
1863         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1864         dev->freeObjects = newObjects;
1865         dev->nFreeObjects += nObjects;
1866         dev->nObjectsCreated += nObjects;
1867
1868         /* Now add this bunch of Objects to a list for freeing up. */
1869
1870         list->objects = newObjects;
1871         list->next = dev->allocatedObjectList;
1872         dev->allocatedObjectList = list;
1873
1874         return YAFFS_OK;
1875 }
1876
1877
1878 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1879 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1880 {
1881         yaffs_Object *tn = NULL;
1882
1883         /* If there are none left make more */
1884         if (!dev->freeObjects) {
1885                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1886         }
1887
1888         if (dev->freeObjects) {
1889                 tn = dev->freeObjects;
1890                 dev->freeObjects =
1891                     (yaffs_Object *) (dev->freeObjects->siblings.next);
1892                 dev->nFreeObjects--;
1893
1894                 /* Now sweeten it up... */
1895
1896                 memset(tn, 0, sizeof(yaffs_Object));
1897                 tn->myDev = dev;
1898                 tn->chunkId = -1;
1899                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1900                 INIT_LIST_HEAD(&(tn->hardLinks));
1901                 INIT_LIST_HEAD(&(tn->hashLink));
1902                 INIT_LIST_HEAD(&tn->siblings);
1903
1904                 /* Add it to the lost and found directory.
1905                  * NB Can't put root or lostNFound in lostNFound so
1906                  * check if lostNFound exists first
1907                  */
1908                 if (dev->lostNFoundDir) {
1909                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1910                 }
1911         }
1912
1913         return tn;
1914 }
1915
1916 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1917                                                __u32 mode)
1918 {
1919
1920         yaffs_Object *obj =
1921             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1922         if (obj) {
1923                 obj->fake = 1;          /* it is fake so it has no NAND presence... */
1924                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1925                 obj->unlinkAllowed = 0; /* ... or unlink it */
1926                 obj->deleted = 0;
1927                 obj->unlinked = 0;
1928                 obj->yst_mode = mode;
1929                 obj->myDev = dev;
1930                 obj->chunkId = 0;       /* Not a valid chunk. */
1931         }
1932
1933         return obj;
1934
1935 }
1936
1937 static void yaffs_UnhashObject(yaffs_Object * tn)
1938 {
1939         int bucket;
1940         yaffs_Device *dev = tn->myDev;
1941
1942         /* If it is still linked into the bucket list, free from the list */
1943         if (!list_empty(&tn->hashLink)) {
1944                 list_del_init(&tn->hashLink);
1945                 bucket = yaffs_HashFunction(tn->objectId);
1946                 dev->objectBucket[bucket].count--;
1947         }
1948
1949 }
1950
1951 /*  FreeObject frees up a Object and puts it back on the free list */
1952 static void yaffs_FreeObject(yaffs_Object * tn)
1953 {
1954
1955         yaffs_Device *dev = tn->myDev;
1956
1957 #ifdef  __KERNEL__
1958         if (tn->myInode) {
1959                 /* We're still hooked up to a cached inode.
1960                  * Don't delete now, but mark for later deletion
1961                  */
1962                 tn->deferedFree = 1;
1963                 return;
1964         }
1965 #endif
1966
1967         yaffs_UnhashObject(tn);
1968
1969         /* Link into the free list. */
1970         tn->siblings.next = (struct list_head *)(dev->freeObjects);
1971         dev->freeObjects = tn;
1972         dev->nFreeObjects++;
1973 }
1974
1975 #ifdef __KERNEL__
1976
1977 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1978 {
1979         if (obj->deferedFree) {
1980                 yaffs_FreeObject(obj);
1981         }
1982 }
1983
1984 #endif
1985
1986 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1987 {
1988         /* Free the list of allocated Objects */
1989
1990         yaffs_ObjectList *tmp;
1991
1992         while (dev->allocatedObjectList) {
1993                 tmp = dev->allocatedObjectList->next;
1994                 YFREE(dev->allocatedObjectList->objects);
1995                 YFREE(dev->allocatedObjectList);
1996
1997                 dev->allocatedObjectList = tmp;
1998         }
1999
2000         dev->freeObjects = NULL;
2001         dev->nFreeObjects = 0;
2002 }
2003
2004 static void yaffs_InitialiseObjects(yaffs_Device * dev)
2005 {
2006         int i;
2007
2008         dev->allocatedObjectList = NULL;
2009         dev->freeObjects = NULL;
2010         dev->nFreeObjects = 0;
2011
2012         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2013                 INIT_LIST_HEAD(&dev->objectBucket[i].list);
2014                 dev->objectBucket[i].count = 0;
2015         }
2016
2017 }
2018
2019 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
2020 {
2021         static int x = 0;
2022         int i;
2023         int l = 999;
2024         int lowest = 999999;
2025
2026         /* First let's see if we can find one that's empty. */
2027
2028         for (i = 0; i < 10 && lowest > 0; i++) {
2029                 x++;
2030                 x %= YAFFS_NOBJECT_BUCKETS;
2031                 if (dev->objectBucket[x].count < lowest) {
2032                         lowest = dev->objectBucket[x].count;
2033                         l = x;
2034                 }
2035
2036         }
2037
2038         /* If we didn't find an empty list, then try
2039          * looking a bit further for a short one
2040          */
2041
2042         for (i = 0; i < 10 && lowest > 3; i++) {
2043                 x++;
2044                 x %= YAFFS_NOBJECT_BUCKETS;
2045                 if (dev->objectBucket[x].count < lowest) {
2046                         lowest = dev->objectBucket[x].count;
2047                         l = x;
2048                 }
2049
2050         }
2051
2052         return l;
2053 }
2054
2055 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
2056 {
2057         int bucket = yaffs_FindNiceObjectBucket(dev);
2058
2059         /* Now find an object value that has not already been taken
2060          * by scanning the list.
2061          */
2062
2063         int found = 0;
2064         struct list_head *i;
2065
2066         __u32 n = (__u32) bucket;
2067
2068         /* yaffs_CheckObjectHashSanity();  */
2069
2070         while (!found) {
2071                 found = 1;
2072                 n += YAFFS_NOBJECT_BUCKETS;
2073                 if (1 || dev->objectBucket[bucket].count > 0) {
2074                         list_for_each(i, &dev->objectBucket[bucket].list) {
2075                                 /* If there is already one in the list */
2076                                 if (i
2077                                     && list_entry(i, yaffs_Object,
2078                                                   hashLink)->objectId == n) {
2079                                         found = 0;
2080                                 }
2081                         }
2082                 }
2083         }
2084
2085
2086         return n;
2087 }
2088
2089 static void yaffs_HashObject(yaffs_Object * in)
2090 {
2091         int bucket = yaffs_HashFunction(in->objectId);
2092         yaffs_Device *dev = in->myDev;
2093
2094         list_add(&in->hashLink, &dev->objectBucket[bucket].list);
2095         dev->objectBucket[bucket].count++;
2096
2097 }
2098
2099 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
2100 {
2101         int bucket = yaffs_HashFunction(number);
2102         struct list_head *i;
2103         yaffs_Object *in;
2104
2105         list_for_each(i, &dev->objectBucket[bucket].list) {
2106                 /* Look if it is in the list */
2107                 if (i) {
2108                         in = list_entry(i, yaffs_Object, hashLink);
2109                         if (in->objectId == number) {
2110 #ifdef __KERNEL__
2111                                 /* Don't tell the VFS about this one if it is defered free */
2112                                 if (in->deferedFree)
2113                                         return NULL;
2114 #endif
2115
2116                                 return in;
2117                         }
2118                 }
2119         }
2120
2121         return NULL;
2122 }
2123
2124 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
2125                                     yaffs_ObjectType type)
2126 {
2127
2128         yaffs_Object *theObject;
2129         yaffs_Tnode *tn;
2130
2131         if (number < 0) {
2132                 number = yaffs_CreateNewObjectNumber(dev);
2133         }
2134
2135         theObject = yaffs_AllocateEmptyObject(dev);
2136         if(!theObject)
2137                 return NULL;
2138
2139         if(type == YAFFS_OBJECT_TYPE_FILE){
2140                 tn = yaffs_GetTnode(dev);
2141                 if(!tn){
2142                         yaffs_FreeObject(theObject);
2143                         return NULL;
2144                 }
2145         }
2146
2147
2148
2149         if (theObject) {
2150                 theObject->fake = 0;
2151                 theObject->renameAllowed = 1;
2152                 theObject->unlinkAllowed = 1;
2153                 theObject->objectId = number;
2154                 yaffs_HashObject(theObject);
2155                 theObject->variantType = type;
2156 #ifdef CONFIG_YAFFS_WINCE
2157                 yfsd_WinFileTimeNow(theObject->win_atime);
2158                 theObject->win_ctime[0] = theObject->win_mtime[0] =
2159                     theObject->win_atime[0];
2160                 theObject->win_ctime[1] = theObject->win_mtime[1] =
2161                     theObject->win_atime[1];
2162
2163 #else
2164
2165                 theObject->yst_atime = theObject->yst_mtime =
2166                     theObject->yst_ctime = Y_CURRENT_TIME;
2167 #endif
2168                 switch (type) {
2169                 case YAFFS_OBJECT_TYPE_FILE:
2170                         theObject->variant.fileVariant.fileSize = 0;
2171                         theObject->variant.fileVariant.scannedFileSize = 0;
2172                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2173                         theObject->variant.fileVariant.topLevel = 0;
2174                         theObject->variant.fileVariant.top = tn;
2175                         break;
2176                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2177                         INIT_LIST_HEAD(&theObject->variant.directoryVariant.
2178                                        children);
2179                         break;
2180                 case YAFFS_OBJECT_TYPE_SYMLINK:
2181                 case YAFFS_OBJECT_TYPE_HARDLINK:
2182                 case YAFFS_OBJECT_TYPE_SPECIAL:
2183                         /* No action required */
2184                         break;
2185                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2186                         /* todo this should not happen */
2187                         break;
2188                 }
2189         }
2190
2191         return theObject;
2192 }
2193
2194 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
2195                                                       int number,
2196                                                       yaffs_ObjectType type)
2197 {
2198         yaffs_Object *theObject = NULL;
2199
2200         if (number > 0) {
2201                 theObject = yaffs_FindObjectByNumber(dev, number);
2202         }
2203
2204         if (!theObject) {
2205                 theObject = yaffs_CreateNewObject(dev, number, type);
2206         }
2207
2208         return theObject;
2209
2210 }
2211
2212
2213 static YCHAR *yaffs_CloneString(const YCHAR * str)
2214 {
2215         YCHAR *newStr = NULL;
2216
2217         if (str && *str) {
2218                 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2219                 if(newStr)
2220                         yaffs_strcpy(newStr, str);
2221         }
2222
2223         return newStr;
2224
2225 }
2226
2227 /*
2228  * Mknod (create) a new object.
2229  * equivalentObject only has meaning for a hard link;
2230  * aliasString only has meaning for a sumlink.
2231  * rdev only has meaning for devices (a subset of special objects)
2232  */
2233
2234 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2235                                        yaffs_Object * parent,
2236                                        const YCHAR * name,
2237                                        __u32 mode,
2238                                        __u32 uid,
2239                                        __u32 gid,
2240                                        yaffs_Object * equivalentObject,
2241                                        const YCHAR * aliasString, __u32 rdev)
2242 {
2243         yaffs_Object *in;
2244         YCHAR *str;
2245
2246         yaffs_Device *dev = parent->myDev;
2247
2248         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2249         if (yaffs_FindObjectByName(parent, name)) {
2250                 return NULL;
2251         }
2252
2253         in = yaffs_CreateNewObject(dev, -1, type);
2254
2255         if(type == YAFFS_OBJECT_TYPE_SYMLINK){
2256                 str = yaffs_CloneString(aliasString);
2257                 if(!str){
2258                         yaffs_FreeObject(in);
2259                         return NULL;
2260                 }
2261         }
2262
2263
2264
2265         if (in) {
2266                 in->chunkId = -1;
2267                 in->valid = 1;
2268                 in->variantType = type;
2269
2270                 in->yst_mode = mode;
2271
2272 #ifdef CONFIG_YAFFS_WINCE
2273                 yfsd_WinFileTimeNow(in->win_atime);
2274                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2275                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2276
2277 #else
2278                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2279
2280                 in->yst_rdev = rdev;
2281                 in->yst_uid = uid;
2282                 in->yst_gid = gid;
2283 #endif
2284                 in->nDataChunks = 0;
2285
2286                 yaffs_SetObjectName(in, name);
2287                 in->dirty = 1;
2288
2289                 yaffs_AddObjectToDirectory(parent, in);
2290
2291                 in->myDev = parent->myDev;
2292
2293                 switch (type) {
2294                 case YAFFS_OBJECT_TYPE_SYMLINK:
2295                         in->variant.symLinkVariant.alias = str;
2296                         break;
2297                 case YAFFS_OBJECT_TYPE_HARDLINK:
2298                         in->variant.hardLinkVariant.equivalentObject =
2299                             equivalentObject;
2300                         in->variant.hardLinkVariant.equivalentObjectId =
2301                             equivalentObject->objectId;
2302                         list_add(&in->hardLinks, &equivalentObject->hardLinks);
2303                         break;
2304                 case YAFFS_OBJECT_TYPE_FILE:
2305                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2306                 case YAFFS_OBJECT_TYPE_SPECIAL:
2307                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2308                         /* do nothing */
2309                         break;
2310                 }
2311
2312                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2313                         /* Could not create the object header, fail the creation */
2314                         yaffs_DestroyObject(in);
2315                         in = NULL;
2316                 }
2317
2318         }
2319
2320         return in;
2321 }
2322
2323 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
2324                               __u32 mode, __u32 uid, __u32 gid)
2325 {
2326         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2327                                  uid, gid, NULL, NULL, 0);
2328 }
2329
2330 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
2331                                    __u32 mode, __u32 uid, __u32 gid)
2332 {
2333         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2334                                  mode, uid, gid, NULL, NULL, 0);
2335 }
2336
2337 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
2338                                  __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2339 {
2340         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2341                                  uid, gid, NULL, NULL, rdev);
2342 }
2343
2344 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
2345                                  __u32 mode, __u32 uid, __u32 gid,
2346                                  const YCHAR * alias)
2347 {
2348         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2349                                  uid, gid, NULL, alias, 0);
2350 }
2351
2352 /* yaffs_Link returns the object id of the equivalent object.*/
2353 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
2354                          yaffs_Object * equivalentObject)
2355 {
2356         /* Get the real object in case we were fed a hard link as an equivalent object */
2357         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2358
2359         if (yaffs_MknodObject
2360             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2361              equivalentObject, NULL, 0)) {
2362                 return equivalentObject;
2363         } else {
2364                 return NULL;
2365         }
2366
2367 }
2368
2369 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
2370                                   const YCHAR * newName, int force, int shadows)
2371 {
2372         int unlinkOp;
2373         int deleteOp;
2374
2375         yaffs_Object *existingTarget;
2376
2377         if (newDir == NULL) {
2378                 newDir = obj->parent;   /* use the old directory */
2379         }
2380
2381         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2382                 T(YAFFS_TRACE_ALWAYS,
2383                   (TSTR
2384                    ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
2385                     TENDSTR)));
2386                 YBUG();
2387         }
2388
2389         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2390         if (obj->myDev->isYaffs2) {
2391                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2392         } else {
2393                 unlinkOp = (newDir == obj->myDev->unlinkedDir
2394                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2395         }
2396
2397         deleteOp = (newDir == obj->myDev->deletedDir);
2398
2399         existingTarget = yaffs_FindObjectByName(newDir, newName);
2400
2401         /* If the object is a file going into the unlinked directory,
2402          *   then it is OK to just stuff it in since duplicate names are allowed.
2403          *   else only proceed if the new name does not exist and if we're putting
2404          *   it into a directory.
2405          */
2406         if ((unlinkOp ||
2407              deleteOp ||
2408              force ||
2409              (shadows > 0) ||
2410              !existingTarget) &&
2411             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2412                 yaffs_SetObjectName(obj, newName);
2413                 obj->dirty = 1;
2414
2415                 yaffs_AddObjectToDirectory(newDir, obj);
2416
2417                 if (unlinkOp)
2418                         obj->unlinked = 1;
2419
2420                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2421                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
2422                         return YAFFS_OK;
2423         }
2424
2425         return YAFFS_FAIL;
2426 }
2427
2428 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
2429                        yaffs_Object * newDir, const YCHAR * newName)
2430 {
2431         yaffs_Object *obj;
2432         yaffs_Object *existingTarget;
2433         int force = 0;
2434
2435 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2436         /* Special case for case insemsitive systems (eg. WinCE).
2437          * While look-up is case insensitive, the name isn't.
2438          * Therefore we might want to change x.txt to X.txt
2439         */
2440         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
2441                 force = 1;
2442         }
2443 #endif
2444
2445         obj = yaffs_FindObjectByName(oldDir, oldName);
2446         /* Check new name to long. */
2447         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
2448             yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
2449           /* ENAMETOOLONG */
2450           return YAFFS_FAIL;
2451         else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
2452                  yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2453           /* ENAMETOOLONG */
2454           return YAFFS_FAIL;
2455
2456         if (obj && obj->renameAllowed) {
2457
2458                 /* Now do the handling for an existing target, if there is one */
2459
2460                 existingTarget = yaffs_FindObjectByName(newDir, newName);
2461                 if (existingTarget &&
2462                     existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2463                     !list_empty(&existingTarget->variant.directoryVariant.children)) {
2464                         /* There is a target that is a non-empty directory, so we fail */
2465                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
2466                 } else if (existingTarget && existingTarget != obj) {
2467                         /* Nuke the target first, using shadowing,
2468                          * but only if it isn't the same object
2469                          */
2470                         yaffs_ChangeObjectName(obj, newDir, newName, force,
2471                                                existingTarget->objectId);
2472                         yaffs_UnlinkObject(existingTarget);
2473                 }
2474
2475                 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2476         }
2477         return YAFFS_FAIL;
2478 }
2479
2480 /*------------------------- Block Management and Page Allocation ----------------*/
2481
2482 static int yaffs_InitialiseBlocks(yaffs_Device * dev)
2483 {
2484         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2485
2486         dev->blockInfo = NULL;
2487         dev->chunkBits = NULL;
2488
2489         dev->allocationBlock = -1;      /* force it to get a new one */
2490
2491         /* If the first allocation strategy fails, thry the alternate one */
2492         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2493         if(!dev->blockInfo){
2494                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2495                 dev->blockInfoAlt = 1;
2496         }
2497         else
2498                 dev->blockInfoAlt = 0;
2499
2500         if(dev->blockInfo){
2501
2502                 /* Set up dynamic blockinfo stuff. */
2503                 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2504                 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2505                 if(!dev->chunkBits){
2506                         dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2507                         dev->chunkBitsAlt = 1;
2508                 }
2509                 else
2510                         dev->chunkBitsAlt = 0;
2511         }
2512
2513         if (dev->blockInfo && dev->chunkBits) {
2514                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2515                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2516                 return YAFFS_OK;
2517         }
2518
2519         return YAFFS_FAIL;
2520
2521 }
2522
2523 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
2524 {
2525         if(dev->blockInfoAlt && dev->blockInfo)
2526                 YFREE_ALT(dev->blockInfo);
2527         else if(dev->blockInfo)
2528                 YFREE(dev->blockInfo);
2529
2530         dev->blockInfoAlt = 0;
2531
2532         dev->blockInfo = NULL;
2533
2534         if(dev->chunkBitsAlt && dev->chunkBits)
2535                 YFREE_ALT(dev->chunkBits);
2536         else if(dev->chunkBits)
2537                 YFREE(dev->chunkBits);
2538         dev->chunkBitsAlt = 0;
2539         dev->chunkBits = NULL;
2540 }
2541
2542 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
2543                                             yaffs_BlockInfo * bi)
2544 {
2545         int i;
2546         __u32 seq;
2547         yaffs_BlockInfo *b;
2548
2549         if (!dev->isYaffs2)
2550                 return 1;       /* disqualification only applies to yaffs2. */
2551
2552         if (!bi->hasShrinkHeader)
2553                 return 1;       /* can gc */
2554
2555         /* Find the oldest dirty sequence number if we don't know it and save it
2556          * so we don't have to keep recomputing it.
2557          */
2558         if (!dev->oldestDirtySequence) {
2559                 seq = dev->sequenceNumber;
2560
2561                 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2562                      i++) {
2563                         b = yaffs_GetBlockInfo(dev, i);
2564                         if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2565                             (b->pagesInUse - b->softDeletions) <
2566                             dev->nChunksPerBlock && b->sequenceNumber < seq) {
2567                                 seq = b->sequenceNumber;
2568                         }
2569                 }
2570                 dev->oldestDirtySequence = seq;
2571         }
2572
2573         /* Can't do gc of this block if there are any blocks older than this one that have
2574          * discarded pages.
2575          */
2576         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2577
2578 }
2579
2580 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2581  * for garbage collection.
2582  */
2583
2584 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
2585                                                int aggressive)
2586 {
2587
2588         int b = dev->currentDirtyChecker;
2589
2590         int i;
2591         int iterations;
2592         int dirtiest = -1;
2593         int pagesInUse = 0;
2594         int prioritised=0;
2595         yaffs_BlockInfo *bi;
2596         int pendingPrioritisedExist = 0;
2597
2598         /* First let's see if we need to grab a prioritised block */
2599         if(dev->hasPendingPrioritisedGCs){
2600                 for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
2601
2602                         bi = yaffs_GetBlockInfo(dev, i);
2603                         //yaffs_VerifyBlock(dev,bi,i);
2604
2605                         if(bi->gcPrioritise) {
2606                                 pendingPrioritisedExist = 1;
2607                                 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2608                                    yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
2609                                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2610                                         dirtiest = i;
2611                                         prioritised = 1;
2612                                         aggressive = 1; /* Fool the non-aggressive skip logiv below */
2613                                 }
2614                         }
2615                 }
2616
2617                 if(!pendingPrioritisedExist) /* None found, so we can clear this */
2618                         dev->hasPendingPrioritisedGCs = 0;
2619         }
2620
2621         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2622          * search harder.
2623          * else (we're doing a leasurely gc), then we only bother to do this if the
2624          * block has only a few pages in use.
2625          */
2626
2627         dev->nonAggressiveSkip--;
2628
2629         if (!aggressive && (dev->nonAggressiveSkip > 0)) {
2630                 return -1;
2631         }
2632
2633         if(!prioritised)
2634                 pagesInUse =
2635                         (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2636
2637         if (aggressive) {
2638                 iterations =
2639                     dev->internalEndBlock - dev->internalStartBlock + 1;
2640         } else {
2641                 iterations =
2642                     dev->internalEndBlock - dev->internalStartBlock + 1;
2643                 iterations = iterations / 16;
2644                 if (iterations > 200) {
2645                         iterations = 200;
2646                 }
2647         }
2648
2649         for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2650                 b++;
2651                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2652                         b = dev->internalStartBlock;
2653                 }
2654
2655                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2656                         T(YAFFS_TRACE_ERROR,
2657                           (TSTR("**>> Block %d is not valid" TENDSTR), b));
2658                         YBUG();
2659                 }
2660
2661                 bi = yaffs_GetBlockInfo(dev, b);
2662
2663 #if 0
2664                 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
2665                         dirtiest = b;
2666                         pagesInUse = 0;
2667                 }
2668                 else
2669 #endif
2670
2671                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2672                        (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2673                         yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2674                         dirtiest = b;
2675                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2676                 }
2677         }
2678
2679         dev->currentDirtyChecker = b;
2680
2681         if (dirtiest > 0) {
2682                 T(YAFFS_TRACE_GC,
2683                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2684                    dev->nChunksPerBlock - pagesInUse,prioritised));
2685         }
2686
2687         dev->oldestDirtySequence = 0;
2688
2689         if (dirtiest > 0) {
2690                 dev->nonAggressiveSkip = 4;
2691         }
2692
2693         return dirtiest;
2694 }
2695
2696 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
2697 {
2698         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2699
2700         int erasedOk = 0;
2701
2702         /* If the block is still healthy erase it and mark as clean.
2703          * If the block has had a data failure, then retire it.
2704          */
2705
2706         T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2707                 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2708                 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2709
2710         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2711
2712         if (!bi->needsRetiring) {
2713                 yaffs_InvalidateCheckpoint(dev);
2714                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2715                 if (!erasedOk) {
2716                         dev->nErasureFailures++;
2717                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2718                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2719                 }
2720         }
2721
2722         if (erasedOk &&
2723             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2724                 int i;
2725                 for (i = 0; i < dev->nChunksPerBlock; i++) {
2726                         if (!yaffs_CheckChunkErased
2727                             (dev, blockNo * dev->nChunksPerBlock + i)) {
2728                                 T(YAFFS_TRACE_ERROR,
2729                                   (TSTR
2730                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2731                                     TENDSTR), blockNo, i));
2732                         }
2733                 }
2734         }
2735
2736         if (erasedOk) {
2737                 /* Clean it up... */
2738                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2739                 dev->nErasedBlocks++;
2740                 bi->pagesInUse = 0;
2741                 bi->softDeletions = 0;
2742                 bi->hasShrinkHeader = 0;
2743                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2744                 bi->gcPrioritise = 0;
2745                 yaffs_ClearChunkBits(dev, blockNo);
2746
2747                 T(YAFFS_TRACE_ERASE,
2748                   (TSTR("Erased block %d" TENDSTR), blockNo));
2749         } else {
2750                 dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
2751
2752                 yaffs_RetireBlock(dev, blockNo);
2753                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2754                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2755         }
2756 }
2757
2758 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2759 {
2760         int i;
2761
2762         yaffs_BlockInfo *bi;
2763
2764         if (dev->nErasedBlocks < 1) {
2765                 /* Hoosterman we've got a problem.
2766                  * Can't get space to gc
2767                  */
2768                 T(YAFFS_TRACE_ERROR,
2769                   (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2770
2771                 return -1;
2772         }
2773
2774         /* Find an empty block. */
2775
2776         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2777                 dev->allocationBlockFinder++;
2778                 if (dev->allocationBlockFinder < dev->internalStartBlock
2779                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2780                         dev->allocationBlockFinder = dev->internalStartBlock;
2781                 }
2782
2783                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2784
2785                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2786                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2787                         dev->sequenceNumber++;
2788                         bi->sequenceNumber = dev->sequenceNumber;
2789                         dev->nErasedBlocks--;
2790                         T(YAFFS_TRACE_ALLOCATE,
2791                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2792                            dev->allocationBlockFinder, dev->sequenceNumber,
2793                            dev->nErasedBlocks));
2794                         return dev->allocationBlockFinder;
2795                 }
2796         }
2797
2798         T(YAFFS_TRACE_ALWAYS,
2799           (TSTR
2800            ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2801             TENDSTR), dev->nErasedBlocks));
2802
2803         return -1;
2804 }
2805
2806
2807 // Check if there's space to allocate...
2808 // Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2809 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2810 {
2811         int reservedChunks;
2812         int reservedBlocks = dev->nReservedBlocks;
2813         int checkpointBlocks;
2814
2815         checkpointBlocks =  dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
2816         if(checkpointBlocks < 0)
2817                 checkpointBlocks = 0;
2818
2819         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2820
2821         return (dev->nFreeChunks > reservedChunks);
2822 }
2823
2824 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
2825 {
2826         int retVal;
2827         yaffs_BlockInfo *bi;
2828
2829         if (dev->allocationBlock < 0) {
2830                 /* Get next block to allocate off */
2831                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2832                 dev->allocationPage = 0;
2833         }
2834
2835         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2836                 /* Not enough space to allocate unless we're allowed to use the reserve. */
2837                 return -1;
2838         }
2839
2840         if (dev->nErasedBlocks < dev->nReservedBlocks
2841             && dev->allocationPage == 0) {
2842                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2843         }
2844
2845         /* Next page please.... */
2846         if (dev->allocationBlock >= 0) {
2847                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2848
2849                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2850                     dev->allocationPage;
2851                 bi->pagesInUse++;
2852                 yaffs_SetChunkBit(dev, dev->allocationBlock,
2853                                   dev->allocationPage);
2854
2855                 dev->allocationPage++;
2856
2857                 dev->nFreeChunks--;
2858
2859                 /* If the block is full set the state to full */
2860                 if (dev->allocationPage >= dev->nChunksPerBlock) {
2861                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2862                         dev->allocationBlock = -1;
2863                 }
2864
2865                 if(blockUsedPtr)
2866                         *blockUsedPtr = bi;
2867
2868                 return retVal;
2869         }
2870
2871         T(YAFFS_TRACE_ERROR,
2872           (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2873
2874         return -1;
2875 }
2876
2877 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2878 {
2879         int n;
2880
2881         n = dev->nErasedBlocks * dev->nChunksPerBlock;
2882
2883         if (dev->allocationBlock > 0) {
2884                 n += (dev->nChunksPerBlock - dev->allocationPage);
2885         }
2886
2887         return n;
2888
2889 }
2890
2891 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2892 {
2893         int oldChunk;
2894         int newChunk;
2895         int chunkInBlock;
2896         int markNAND;
2897         int retVal = YAFFS_OK;
2898         int cleanups = 0;
2899         int i;
2900         int isCheckpointBlock;
2901         int matchingChunk;
2902
2903         int chunksBefore = yaffs_GetErasedChunks(dev);
2904         int chunksAfter;
2905
2906         yaffs_ExtendedTags tags;
2907
2908         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2909
2910         yaffs_Object *object;
2911
2912         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2913
2914         bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2915
2916         T(YAFFS_TRACE_TRACING,
2917           (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2918            bi->pagesInUse, bi->hasShrinkHeader));
2919
2920         /*yaffs_VerifyFreeChunks(dev); */
2921
2922         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
2923
2924         /* Take off the number of soft deleted entries because
2925          * they're going to get really deleted during GC.
2926          */
2927         dev->nFreeChunks -= bi->softDeletions;
2928
2929         dev->isDoingGC = 1;
2930
2931         if (isCheckpointBlock ||
2932             !yaffs_StillSomeChunkBits(dev, block)) {
2933                 T(YAFFS_TRACE_TRACING,
2934                   (TSTR
2935                    ("Collecting block %d that has no chunks in use" TENDSTR),
2936                    block));
2937                 yaffs_BlockBecameDirty(dev, block);
2938         } else {
2939
2940                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2941
2942                 yaffs_VerifyBlock(dev,bi,block);
2943
2944                 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2945                      chunkInBlock < dev->nChunksPerBlock
2946                      && yaffs_StillSomeChunkBits(dev, block);
2947                      chunkInBlock++, oldChunk++) {
2948                         if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2949
2950                                 /* This page is in use and might need to be copied off */
2951
2952                                 markNAND = 1;
2953
2954                                 yaffs_InitialiseTags(&tags);
2955
2956                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2957                                                                 buffer, &tags);
2958
2959                                 object =
2960                                     yaffs_FindObjectByNumber(dev,
2961                                                              tags.objectId);
2962
2963                                 T(YAFFS_TRACE_GC_DETAIL,
2964                                   (TSTR
2965                                    ("Collecting page %d, %d %d %d " TENDSTR),
2966                                    chunkInBlock, tags.objectId, tags.chunkId,
2967                                    tags.byteCount));
2968
2969                                 if(object && !yaffs_SkipVerification(dev)){
2970                                         if(tags.chunkId == 0)
2971                                                 matchingChunk = object->chunkId;
2972                                         else if(object->softDeleted)
2973                                                 matchingChunk = oldChunk; /* Defeat the test */
2974                                         else
2975                                                 matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
2976
2977                                         if(oldChunk != matchingChunk)
2978                                                 T(YAFFS_TRACE_ERROR,
2979                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2980                                                   oldChunk,matchingChunk,tags.objectId, tags.chunkId));
2981
2982                                 }
2983
2984                                 if (!object) {
2985                                         T(YAFFS_TRACE_ERROR,
2986                                           (TSTR
2987                                            ("page %d in gc has no object: %d %d %d "
2988                                             TENDSTR), oldChunk,
2989                                             tags.objectId, tags.chunkId, tags.byteCount));
2990                                 }
2991
2992                                 if (object && object->deleted
2993                                     && tags.chunkId != 0) {
2994                                         /* Data chunk in a deleted file, throw it away
2995                                          * It's a soft deleted data chunk,
2996                                          * No need to copy this, just forget about it and
2997                                          * fix up the object.
2998                                          */
2999
3000                                         object->nDataChunks--;
3001
3002                                         if (object->nDataChunks <= 0) {
3003                                                 /* remeber to clean up the object */
3004                                                 dev->gcCleanupList[cleanups] =
3005                                                     tags.objectId;
3006                                                 cleanups++;
3007                                         }
3008                                         markNAND = 0;
3009                                 } else if (0
3010                                            /* Todo object && object->deleted && object->nDataChunks == 0 */
3011                                            ) {
3012                                         /* Deleted object header with no data chunks.
3013                                          * Can be discarded and the file deleted.
3014                                          */
3015                                         object->chunkId = 0;
3016                                         yaffs_FreeTnode(object->myDev,
3017                                                         object->variant.
3018                                                         fileVariant.top);
3019                                         object->variant.fileVariant.top = NULL;
3020                                         yaffs_DoGenericObjectDeletion(object);
3021
3022                                 } else if (object) {
3023                                         /* It's either a data chunk in a live file or
3024                                          * an ObjectHeader, so we're interested in it.
3025                                          * NB Need to keep the ObjectHeaders of deleted files
3026                                          * until the whole file has been deleted off
3027                                          */
3028                                         tags.serialNumber++;
3029
3030                                         dev->nGCCopies++;
3031
3032                                         if (tags.chunkId == 0) {
3033                                                 /* It is an object Id,
3034                                                  * We need to nuke the shrinkheader flags first
3035                                                  * We no longer want the shrinkHeader flag since its work is done
3036                                                  * and if it is left in place it will mess up scanning.
3037                                                  * Also, clear out any shadowing stuff
3038                                                  */
3039
3040                                                 yaffs_ObjectHeader *oh;
3041                                                 oh = (yaffs_ObjectHeader *)buffer;
3042                                                 oh->isShrink = 0;
3043                                                 oh->shadowsObject = -1;
3044                                                 tags.extraShadows = 0;
3045                                                 tags.extraIsShrinkHeader = 0;
3046
3047                                                 yaffs_VerifyObjectHeader(object,oh,&tags,1);
3048                                         }
3049
3050                                         newChunk =
3051                                             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3052
3053                                         if (newChunk < 0) {
3054                                                 retVal = YAFFS_FAIL;
3055                                         } else {
3056
3057                                                 /* Ok, now fix up the Tnodes etc. */
3058
3059                                                 if (tags.chunkId == 0) {
3060                                                         /* It's a header */
3061                                                         object->chunkId =  newChunk;
3062                                                         object->serial =   tags.serialNumber;
3063                                                 } else {
3064                                                         /* It's a data chunk */
3065                                                         yaffs_PutChunkIntoFile
3066                                                             (object,
3067                                                              tags.chunkId,
3068                                                              newChunk, 0);
3069                                                 }
3070                                         }
3071                                 }
3072
3073                                 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3074
3075                         }
3076                 }
3077
3078                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3079
3080
3081                 /* Do any required cleanups */
3082                 for (i = 0; i < cleanups; i++) {
3083                         /* Time to delete the file too */
3084                         object =
3085                             yaffs_FindObjectByNumber(dev,
3086                                                      dev->gcCleanupList[i]);
3087                         if (object) {
3088                                 yaffs_FreeTnode(dev,
3089                                                 object->variant.fileVariant.
3090                                                 top);
3091                                 object->variant.fileVariant.top = NULL;
3092                                 T(YAFFS_TRACE_GC,
3093                                   (TSTR
3094                                    ("yaffs: About to finally delete object %d"
3095                                     TENDSTR), object->objectId));
3096                                 yaffs_DoGenericObjectDeletion(object);
3097                                 object->myDev->nDeletedFiles--;
3098                         }
3099
3100                 }
3101
3102         }
3103
3104         yaffs_VerifyCollectedBlock(dev,bi,block);
3105
3106         if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
3107                 T(YAFFS_TRACE_GC,
3108                   (TSTR
3109                    ("gc did not increase free chunks before %d after %d"
3110                     TENDSTR), chunksBefore, chunksAfter));
3111         }
3112
3113         dev->isDoingGC = 0;
3114
3115         return YAFFS_OK;
3116 }
3117
3118 /* New garbage collector
3119  * If we're very low on erased blocks then we do aggressive garbage collection
3120  * otherwise we do "leasurely" garbage collection.
3121  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3122  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3123  *
3124  * The idea is to help clear out space in a more spread-out manner.
3125  * Dunno if it really does anything useful.
3126  */
3127 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
3128 {
3129         int block;
3130         int aggressive;
3131         int gcOk = YAFFS_OK;
3132         int maxTries = 0;
3133
3134         int checkpointBlockAdjust;
3135
3136         if (dev->isDoingGC) {
3137                 /* Bail out so we don't get recursive gc */
3138                 return YAFFS_OK;
3139         }
3140
3141         /* This loop should pass the first time.
3142          * We'll only see looping here if the erase of the collected block fails.
3143          */
3144
3145         do {
3146                 maxTries++;
3147
3148                 checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
3149                 if(checkpointBlockAdjust < 0)
3150                         checkpointBlockAdjust = 0;
3151
3152                 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3153                         /* We need a block soon...*/
3154                         aggressive = 1;
3155                 } else {
3156                         /* We're in no hurry */
3157                         aggressive = 0;
3158                 }
3159
3160                 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3161
3162                 if (block > 0) {
3163                         dev->garbageCollections++;
3164                         if (!aggressive) {
3165                                 dev->passiveGarbageCollections++;
3166                         }
3167
3168                         T(YAFFS_TRACE_GC,
3169                           (TSTR
3170                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3171                            dev->nErasedBlocks, aggressive));
3172
3173                         gcOk = yaffs_GarbageCollectBlock(dev, block);
3174                 }
3175
3176                 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3177                         T(YAFFS_TRACE_GC,
3178                           (TSTR
3179                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3180                             TENDSTR), dev->nErasedBlocks, maxTries, block));
3181                 }
3182         } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
3183                  && (maxTries < 2));
3184
3185         return aggressive ? gcOk : YAFFS_OK;
3186 }
3187
3188 /*-------------------------  TAGS --------------------------------*/
3189
3190 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
3191                            int chunkInObject)
3192 {
3193         return (tags->chunkId == chunkInObject &&
3194                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3195
3196 }
3197
3198
3199 /*-------------------- Data file manipulation -----------------*/
3200
3201 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
3202                                  yaffs_ExtendedTags * tags)
3203 {
3204         /*Get the Tnode, then get the level 0 offset chunk offset */
3205         yaffs_Tnode *tn;
3206         int theChunk = -1;
3207         yaffs_ExtendedTags localTags;
3208         int retVal = -1;
3209
3210         yaffs_Device *dev = in->myDev;
3211
3212         if (!tags) {
3213                 /* Passed a NULL, so use our own tags space */
3214                 tags = &localTags;
3215         }
3216
3217         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3218
3219         if (tn) {
3220                 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3221
3222                 retVal =
3223                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3224                                            chunkInInode);
3225         }
3226         return retVal;
3227 }
3228
3229 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
3230                                           yaffs_ExtendedTags * tags)
3231 {
3232         /* Get the Tnode, then get the level 0 offset chunk offset */
3233         yaffs_Tnode *tn;
3234         int theChunk = -1;
3235         yaffs_ExtendedTags localTags;
3236
3237         yaffs_Device *dev = in->myDev;
3238         int retVal = -1;
3239
3240         if (!tags) {
3241                 /* Passed a NULL, so use our own tags space */
3242                 tags = &localTags;
3243         }
3244
3245         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3246
3247         if (tn) {
3248
3249                 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3250
3251                 retVal =
3252                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3253                                            chunkInInode);
3254
3255                 /* Delete the entry in the filestructure (if found) */
3256                 if (retVal != -1) {
3257                         yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
3258                 }
3259         } else {
3260                 /*T(("No level 0 found for %d\n", chunkInInode)); */
3261         }
3262
3263         if (retVal == -1) {
3264                 /* T(("Could not find %d to delete\n",chunkInInode)); */
3265         }
3266         return retVal;
3267 }
3268
3269 #ifdef YAFFS_PARANOID
3270
3271 static int yaffs_CheckFileSanity(yaffs_Object * in)
3272 {
3273         int chunk;
3274         int nChunks;
3275         int fSize;
3276         int failed = 0;
3277         int objId;
3278         yaffs_Tnode *tn;
3279         yaffs_Tags localTags;
3280         yaffs_Tags *tags = &localTags;
3281         int theChunk;
3282         int chunkDeleted;
3283
3284         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3285                 /* T(("Object not a file\n")); */
3286                 return YAFFS_FAIL;
3287         }
3288
3289         objId = in->objectId;
3290         fSize = in->variant.fileVariant.fileSize;
3291         nChunks =
3292             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3293
3294         for (chunk = 1; chunk <= nChunks; chunk++) {
3295                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3296                                            chunk);
3297
3298                 if (tn) {
3299
3300                         theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
3301
3302                         if (yaffs_CheckChunkBits
3303                             (dev, theChunk / dev->nChunksPerBlock,
3304                              theChunk % dev->nChunksPerBlock)) {
3305
3306                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3307                                                             tags,
3308                                                             &chunkDeleted);
3309                                 if (yaffs_TagsMatch
3310                                     (tags, in->objectId, chunk, chunkDeleted)) {
3311                                         /* found it; */
3312
3313                                 }
3314                         } else {
3315
3316                                 failed = 1;
3317                         }
3318
3319                 } else {
3320                         /* T(("No level 0 found for %d\n", chunk)); */
3321                 }
3322         }
3323
3324         return failed ? YAFFS_FAIL : YAFFS_OK;
3325 }
3326
3327 #endif
3328
3329 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
3330                                   int chunkInNAND, int inScan)
3331 {
3332         /* NB inScan is zero unless scanning.
3333          * For forward scanning, inScan is > 0;
3334          * for backward scanning inScan is < 0
3335          */
3336
3337         yaffs_Tnode *tn;
3338         yaffs_Device *dev = in->myDev;
3339         int existingChunk;
3340         yaffs_ExtendedTags existingTags;
3341         yaffs_ExtendedTags newTags;
3342         unsigned existingSerial, newSerial;
3343
3344         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3345                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3346                  * If it is not during Scanning then something went wrong!
3347                  */
3348                 if (!inScan) {
3349                         T(YAFFS_TRACE_ERROR,
3350                           (TSTR
3351                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3352                             TENDSTR)));
3353                         YBUG();
3354                 }
3355
3356                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3357                 return YAFFS_OK;
3358         }
3359
3360         tn = yaffs_AddOrFindLevel0Tnode(dev,
3361                                         &in->variant.fileVariant,
3362                                         chunkInInode,
3363                                         NULL);
3364         if (!tn) {
3365                 return YAFFS_FAIL;
3366         }
3367
3368         existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3369
3370         if (inScan != 0) {
3371                 /* If we're scanning then we need to test for duplicates
3372                  * NB This does not need to be efficient since it should only ever
3373                  * happen when the power fails during a write, then only one
3374                  * chunk should ever be affected.
3375                  *
3376                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3377                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3378                  */
3379
3380                 if (existingChunk != 0) {
3381                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3382                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3383                          *
3384                          * We have a duplicate now we need to decide which one to use:
3385                          *
3386                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3387                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3388                          * YAFFS1: Get both sets of tags and compare serial numbers.
3389                          */
3390
3391                         if (inScan > 0) {
3392                                 /* Only do this for forward scanning */
3393                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3394                                                                 chunkInNAND,
3395                                                                 NULL, &newTags);
3396
3397                                 /* Do a proper find */
3398                                 existingChunk =
3399                                     yaffs_FindChunkInFile(in, chunkInInode,
3400                                                           &existingTags);
3401                         }
3402
3403                         if (existingChunk <= 0) {
3404                                 /*Hoosterman - how did this happen? */
3405
3406                                 T(YAFFS_TRACE_ERROR,
3407                                   (TSTR
3408                                    ("yaffs tragedy: existing chunk < 0 in scan"
3409                                     TENDSTR)));
3410
3411                         }
3412
3413                         /* NB The deleted flags should be false, otherwise the chunks will
3414                          * not be loaded during a scan
3415                          */
3416
3417                         newSerial = newTags.serialNumber;
3418                         existingSerial = existingTags.serialNumber;
3419
3420                         if ((inScan > 0) &&
3421                             (in->myDev->isYaffs2 ||
3422                              existingChunk <= 0 ||
3423                              ((existingSerial + 1) & 3) == newSerial)) {
3424                                 /* Forward scanning.
3425                                  * Use new
3426                                  * Delete the old one and drop through to update the tnode
3427                                  */
3428                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3429                                                   __LINE__);
3430                         } else {
3431                                 /* Backward scanning or we want to use the existing one
3432                                  * Use existing.
3433                                  * Delete the new one and return early so that the tnode isn't changed
3434                                  */
3435                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3436                                                   __LINE__);
3437                                 return YAFFS_OK;
3438                         }
3439                 }
3440
3441         }
3442
3443         if (existingChunk == 0) {
3444                 in->nDataChunks++;
3445         }
3446
3447         yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
3448
3449         return YAFFS_OK;
3450 }
3451
3452 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
3453                                          __u8 * buffer)
3454 {
3455         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3456
3457         if (chunkInNAND >= 0) {
3458                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3459                                                        buffer,NULL);
3460         } else {
3461                 T(YAFFS_TRACE_NANDACCESS,
3462                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3463                    chunkInNAND));
3464                 /* get sane (zero) data if you read a hole */
3465                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3466                 return 0;
3467         }
3468
3469 }
3470
3471 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
3472 {
3473         int block;
3474         int page;
3475         yaffs_ExtendedTags tags;
3476         yaffs_BlockInfo *bi;
3477
3478         if (chunkId <= 0)
3479                 return;
3480
3481
3482         dev->nDeletions++;
3483         block = chunkId / dev->nChunksPerBlock;
3484         page = chunkId % dev->nChunksPerBlock;
3485
3486
3487         if(!yaffs_CheckChunkBit(dev,block,page))
3488                 T(YAFFS_TRACE_VERIFY,
3489                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3490                          chunkId));
3491
3492         bi = yaffs_GetBlockInfo(dev, block);
3493
3494         T(YAFFS_TRACE_DELETION,
3495           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3496
3497         if (markNAND &&
3498             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3499
3500                 yaffs_InitialiseTags(&tags);
3501
3502                 tags.chunkDeleted = 1;
3503
3504                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3505                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3506         } else {
3507                 dev->nUnmarkedDeletions++;
3508         }
3509
3510         /* Pull out of the management area.
3511          * If the whole block became dirty, this will kick off an erasure.
3512          */
3513         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3514             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3515             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3516             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3517                 dev->nFreeChunks++;
3518
3519                 yaffs_ClearChunkBit(dev, block, page);
3520
3521                 bi->pagesInUse--;
3522
3523                 if (bi->pagesInUse == 0 &&
3524                     !bi->hasShrinkHeader &&
3525                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3526                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3527                         yaffs_BlockBecameDirty(dev, block);
3528                 }
3529
3530         } else {
3531                 /* T(("Bad news deleting chunk %d\n",chunkId)); */
3532         }
3533
3534 }
3535
3536 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
3537                                         const __u8 * buffer, int nBytes,
3538                                         int useReserve)
3539 {
3540         /* Find old chunk Need to do this to get serial number
3541          * Write new one and patch into tree.
3542          * Invalidate old tags.
3543          */
3544
3545         int prevChunkId;
3546         yaffs_ExtendedTags prevTags;
3547
3548         int newChunkId;
3549         yaffs_ExtendedTags newTags;
3550
3551         yaffs_Device *dev = in->myDev;
3552
3553         yaffs_CheckGarbageCollection(dev);
3554
3555         /* Get the previous chunk at this location in the file if it exists */
3556         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3557
3558         /* Set up new tags */
3559         yaffs_InitialiseTags(&newTags);
3560
3561         newTags.chunkId = chunkInInode;
3562         newTags.objectId = in->objectId;
3563         newTags.serialNumber =
3564             (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3565         newTags.byteCount = nBytes;
3566
3567         newChunkId =
3568             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3569                                               useReserve);
3570
3571         if (newChunkId >= 0) {
3572                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3573
3574                 if (prevChunkId >= 0) {
3575                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3576
3577                 }
3578
3579                 yaffs_CheckFileSanity(in);
3580         }
3581         return newChunkId;
3582
3583 }
3584
3585 /* UpdateObjectHeader updates the header on NAND for an object.
3586  * If name is not NULL, then that new name is used.
3587  */
3588 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
3589                              int isShrink, int shadows)
3590 {
3591
3592         yaffs_BlockInfo *bi;
3593
3594         yaffs_Device *dev = in->myDev;
3595
3596         int prevChunkId;
3597         int retVal = 0;
3598         int result = 0;
3599
3600         int newChunkId;
3601         yaffs_ExtendedTags newTags;
3602         yaffs_ExtendedTags oldTags;
3603
3604         __u8 *buffer = NULL;
3605         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3606
3607         yaffs_ObjectHeader *oh = NULL;
3608
3609         yaffs_strcpy(oldName,"silly old name");
3610
3611         if (!in->fake || force) {
3612
3613                 yaffs_CheckGarbageCollection(dev);
3614                 yaffs_CheckObjectDetailsLoaded(in);
3615
3616                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3617                 oh = (yaffs_ObjectHeader *) buffer;
3618
3619                 prevChunkId = in->chunkId;
3620
3621                 if (prevChunkId >= 0) {
3622                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3623                                                         buffer, &oldTags);
3624
3625                         yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
3626
3627                         memcpy(oldName, oh->name, sizeof(oh->name));
3628                 }
3629
3630                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3631
3632                 oh->type = in->variantType;
3633                 oh->yst_mode = in->yst_mode;
3634                 oh->shadowsObject = shadows;
3635
3636 #ifdef CONFIG_YAFFS_WINCE
3637                 oh->win_atime[0] = in->win_atime[0];
3638                 oh->win_ctime[0] = in->win_ctime[0];
3639                 oh->win_mtime[0] = in->win_mtime[0];
3640                 oh->win_atime[1] = in->win_atime[1];
3641                 oh->win_ctime[1] = in->win_ctime[1];
3642                 oh->win_mtime[1] = in->win_mtime[1];
3643 #else
3644                 oh->yst_uid = in->yst_uid;
3645                 oh->yst_gid = in->yst_gid;
3646                 oh->yst_atime = in->yst_atime;
3647                 oh->yst_mtime = in->yst_mtime;
3648                 oh->yst_ctime = in->yst_ctime;
3649                 oh->yst_rdev = in->yst_rdev;
3650 #endif
3651                 if (in->parent) {
3652                         oh->parentObjectId = in->parent->objectId;
3653                 } else {
3654                         oh->parentObjectId = 0;
3655                 }
3656
3657                 if (name && *name) {
3658                         memset(oh->name, 0, sizeof(oh->name));
3659                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3660                 } else if (prevChunkId>=0) {
3661                         memcpy(oh->name, oldName, sizeof(oh->name));
3662                 } else {
3663                         memset(oh->name, 0, sizeof(oh->name));
3664                 }
3665
3666                 oh->isShrink = isShrink;
3667
3668                 switch (in->variantType) {
3669                 case YAFFS_OBJECT_TYPE_UNKNOWN:
3670                         /* Should not happen */
3671                         break;
3672                 case YAFFS_OBJECT_TYPE_FILE:
3673                         oh->fileSize =
3674                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3675                              || oh->parentObjectId ==
3676                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3677                             fileVariant.fileSize;
3678                         break;
3679                 case YAFFS_OBJECT_TYPE_HARDLINK:
3680                         oh->equivalentObjectId =
3681                             in->variant.hardLinkVariant.equivalentObjectId;
3682                         break;
3683                 case YAFFS_OBJECT_TYPE_SPECIAL:
3684                         /* Do nothing */
3685                         break;
3686                 case YAFFS_OBJECT_TYPE_DIRECTORY:
3687                         /* Do nothing */
3688                         break;
3689                 case YAFFS_OBJECT_TYPE_SYMLINK:
3690                         yaffs_strncpy(oh->alias,
3691                                       in->variant.symLinkVariant.alias,
3692                                       YAFFS_MAX_ALIAS_LENGTH);
3693                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3694                         break;
3695                 }
3696
3697                 /* Tags */
3698                 yaffs_InitialiseTags(&newTags);
3699                 in->serial++;
3700                 newTags.chunkId = 0;
3701                 newTags.objectId = in->objectId;
3702                 newTags.serialNumber = in->serial;
3703
3704                 /* Add extra info for file header */
3705
3706                 newTags.extraHeaderInfoAvailable = 1;
3707                 newTags.extraParentObjectId = oh->parentObjectId;
3708                 newTags.extraFileLength = oh->fileSize;
3709                 newTags.extraIsShrinkHeader = oh->isShrink;
3710                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3711                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3712                 newTags.extraObjectType = in->variantType;
3713
3714                 yaffs_VerifyObjectHeader(in,oh,&newTags,1);
3715
3716                 /* Create new chunk in NAND */
3717                 newChunkId =
3718                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3719                                                       (prevChunkId >= 0) ? 1 : 0);
3720
3721                 if (newChunkId >= 0) {
3722
3723                         in->chunkId = newChunkId;
3724
3725                         if (prevChunkId >= 0) {
3726                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
3727                                                   __LINE__);
3728                         }
3729
3730                         if(!yaffs_ObjectHasCachedWriteData(in))
3731                                 in->dirty = 0;
3732
3733                         /* If this was a shrink, then mark the block that the chunk lives on */
3734                         if (isShrink) {
3735                                 bi = yaffs_GetBlockInfo(in->myDev,
3736                                                         newChunkId /in->myDev-> nChunksPerBlock);
3737                                 bi->hasShrinkHeader = 1;
3738                         }
3739
3740                 }
3741
3742                 retVal = newChunkId;
3743
3744         }
3745
3746         if (buffer)
3747                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3748
3749         return retVal;
3750 }
3751
3752 /*------------------------ Short Operations Cache ----------------------------------------
3753  *   In many situations where there is no high level buffering (eg WinCE) a lot of
3754  *   reads might be short sequential reads, and a lot of writes may be short
3755  *   sequential writes. eg. scanning/writing a jpeg file.
3756  *   In these cases, a short read/write cache can provide a huge perfomance benefit
3757  *   with dumb-as-a-rock code.
3758  *   In Linux, the page cache provides read buffering aand the short op cache provides write
3759  *   buffering.
3760  *
3761  *   There are a limited number (~10) of cache chunks per device so that we don't
3762  *   need a very intelligent search.
3763  */
3764
3765 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3766 {
3767         yaffs_Device *dev = obj->myDev;
3768         int i;
3769         yaffs_ChunkCache *cache;
3770         int nCaches = obj->myDev->nShortOpCaches;
3771
3772         for(i = 0; i < nCaches; i++){
3773                 cache = &dev->srCache[i];
3774                 if (cache->object == obj &&
3775                     cache->dirty)
3776                         return 1;
3777         }
3778
3779         return 0;
3780 }
3781
3782
3783 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
3784 {
3785         yaffs_Device *dev = obj->myDev;
3786         int lowest = -99;       /* Stop compiler whining. */
3787         int i;
3788         yaffs_ChunkCache *cache;
3789         int chunkWritten = 0;
3790         int nCaches = obj->myDev->nShortOpCaches;
3791
3792         if (nCaches > 0) {
3793                 do {
3794                         cache = NULL;
3795
3796                         /* Find the dirty cache for this object with the lowest chunk id. */
3797                         for (i = 0; i < nCaches; i++) {
3798                                 if (dev->srCache[i].object == obj &&
3799                                     dev->srCache[i].dirty) {
3800                                         if (!cache
3801                                             || dev->srCache[i].chunkId <
3802                                             lowest) {
3803                                                 cache = &dev->srCache[i];
3804                                                 lowest = cache->chunkId;
3805                                         }
3806                                 }
3807                         }
3808
3809                         if (cache && !cache->locked) {
3810                                 /* Write it out and free it up */
3811
3812                                 chunkWritten =
3813                                     yaffs_WriteChunkDataToObject(cache->object,
3814                                                                  cache->chunkId,
3815                                                                  cache->data,
3816                                                                  cache->nBytes,
3817                                                                  1);
3818                                 cache->dirty = 0;
3819                                 cache->object = NULL;
3820                         }
3821
3822                 } while (cache && chunkWritten > 0);
3823
3824                 if (cache) {
3825                         /* Hoosterman, disk full while writing cache out. */
3826                         T(YAFFS_TRACE_ERROR,
3827                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3828
3829                 }
3830         }
3831
3832 }
3833
3834 /*yaffs_FlushEntireDeviceCache(dev)
3835  *
3836  *
3837  */
3838
3839 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3840 {
3841         yaffs_Object *obj;
3842         int nCaches = dev->nShortOpCaches;
3843         int i;
3844
3845         /* Find a dirty object in the cache and flush it...
3846          * until there are no further dirty objects.
3847          */
3848         do {
3849                 obj = NULL;
3850                 for( i = 0; i < nCaches && !obj; i++) {
3851                         if (dev->srCache[i].object &&
3852                             dev->srCache[i].dirty)
3853                                 obj = dev->srCache[i].object;
3854
3855                 }
3856                 if(obj)
3857                         yaffs_FlushFilesChunkCache(obj);
3858
3859         } while(obj);
3860
3861 }
3862
3863
3864 /* Grab us a cache chunk for use.
3865  * First look for an empty one.
3866  * Then look for the least recently used non-dirty one.
3867  * Then look for the least recently used dirty one...., flush and look again.
3868  */
3869 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3870 {
3871         int i;
3872         int usage;
3873         int theOne;
3874
3875         if (dev->nShortOpCaches > 0) {
3876                 for (i = 0; i < dev->nShortOpCaches; i++) {
3877                         if (!dev->srCache[i].object)
3878                                 return &dev->srCache[i];
3879                 }
3880
3881                 return NULL;
3882
3883                 theOne = -1;
3884                 usage = 0;      /* just to stop the compiler grizzling */
3885
3886                 for (i = 0; i < dev->nShortOpCaches; i++) {
3887                         if (!dev->srCache[i].dirty &&
3888                             ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3889                              theOne < 0)) {
3890                                 usage = dev->srCache[i].lastUse;
3891                                 theOne = i;
3892                         }
3893                 }
3894
3895
3896                 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3897         } else {
3898                 return NULL;
3899         }
3900
3901 }
3902
3903 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3904 {
3905         yaffs_ChunkCache *cache;
3906         yaffs_Object *theObj;
3907         int usage;
3908         int i;
3909         int pushout;
3910
3911         if (dev->nShortOpCaches > 0) {
3912                 /* Try find a non-dirty one... */
3913
3914                 cache = yaffs_GrabChunkCacheWorker(dev);
3915
3916                 if (!cache) {
3917                         /* They were all dirty, find the last recently used object and flush
3918                          * its cache, then  find again.
3919                          * NB what's here is not very accurate, we actually flush the object
3920                          * the last recently used page.
3921                          */
3922
3923                         /* With locking we can't assume we can use entry zero */
3924
3925                         theObj = NULL;
3926                         usage = -1;
3927                         cache = NULL;
3928                         pushout = -1;
3929
3930                         for (i = 0; i < dev->nShortOpCaches; i++) {
3931                                 if (dev->srCache[i].object &&
3932                                     !dev->srCache[i].locked &&
3933                                     (dev->srCache[i].lastUse < usage || !cache))
3934                                 {
3935                                         usage = dev->srCache[i].lastUse;
3936                                         theObj = dev->srCache[i].object;
3937                                         cache = &dev->srCache[i];
3938                                         pushout = i;
3939                                 }
3940                         }
3941
3942                         if (!cache || cache->dirty) {
3943                                 /* Flush and try again */
3944                                 yaffs_FlushFilesChunkCache(theObj);
3945                                 cache = yaffs_GrabChunkCacheWorker(dev);
3946                         }
3947
3948                 }
3949                 return cache;
3950         } else
3951                 return NULL;
3952
3953 }
3954
3955 /* Find a cached chunk */
3956 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3957                                               int chunkId)
3958 {
3959         yaffs_Device *dev = obj->myDev;
3960         int i;
3961         if (dev->nShortOpCaches > 0) {
3962                 for (i = 0; i < dev->nShortOpCaches; i++) {
3963                         if (dev->srCache[i].object == obj &&
3964                             dev->srCache[i].chunkId == chunkId) {
3965                                 dev->cacheHits++;
3966
3967                                 return &dev->srCache[i];
3968                         }
3969                 }
3970         }
3971         return NULL;
3972 }
3973
3974 /* Mark the chunk for the least recently used algorithym */
3975 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3976                                 int isAWrite)
3977 {
3978
3979         if (dev->nShortOpCaches > 0) {
3980                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3981                         /* Reset the cache usages */
3982                         int i;
3983                         for (i = 1; i < dev->nShortOpCaches; i++) {
3984                                 dev->srCache[i].lastUse = 0;
3985                         }
3986                         dev->srLastUse = 0;
3987                 }
3988
3989                 dev->srLastUse++;
3990
3991                 cache->lastUse = dev->srLastUse;
3992
3993                 if (isAWrite) {
3994                         cache->dirty = 1;
3995                 }
3996         }
3997 }
3998
3999 /* Invalidate a single cache page.
4000  * Do this when a whole page gets written,
4001  * ie the short cache for this page is no longer valid.
4002  */
4003 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
4004 {
4005         if (object->myDev->nShortOpCaches > 0) {
4006                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4007
4008                 if (cache) {
4009                         cache->object = NULL;
4010                 }
4011         }
4012 }
4013
4014 /* Invalidate all the cache pages associated with this object
4015  * Do this whenever ther file is deleted or resized.
4016  */
4017 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
4018 {
4019         int i;
4020         yaffs_Device *dev = in->myDev;
4021
4022         if (dev->nShortOpCaches > 0) {
4023                 /* Invalidate it. */
4024                 for (i = 0; i < dev->nShortOpCaches; i++) {
4025                         if (dev->srCache[i].object == in) {
4026                                 dev->srCache[i].object = NULL;
4027                         }
4028                 }
4029         }
4030 }
4031
4032 /*--------------------- Checkpointing --------------------*/
4033
4034
4035 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
4036 {
4037         yaffs_CheckpointValidity cp;
4038
4039         memset(&cp,0,sizeof(cp));
4040
4041         cp.structType = sizeof(cp);
4042         cp.magic = YAFFS_MAGIC;
4043         cp.version = YAFFS_CHECKPOINT_VERSION;
4044         cp.head = (head) ? 1 : 0;
4045
4046         return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
4047                 1 : 0;
4048 }
4049
4050 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4051 {
4052         yaffs_CheckpointValidity cp;
4053         int ok;
4054
4055         ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4056
4057         if(ok)
4058                 ok = (cp.structType == sizeof(cp)) &&
4059                      (cp.magic == YAFFS_MAGIC) &&
4060                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4061                      (cp.head == ((head) ? 1 : 0));
4062         return ok ? 1 : 0;
4063 }
4064
4065 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4066                                            yaffs_Device *dev)
4067 {
4068         cp->nErasedBlocks = dev->nErasedBlocks;
4069         cp->allocationBlock = dev->allocationBlock;
4070         cp->allocationPage = dev->allocationPage;
4071         cp->nFreeChunks = dev->nFreeChunks;
4072
4073         cp->nDeletedFiles = dev->nDeletedFiles;
4074         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4075         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4076         cp->sequenceNumber = dev->sequenceNumber;
4077         cp->oldestDirtySequence = dev->oldestDirtySequence;
4078
4079 }
4080
4081 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4082                                            yaffs_CheckpointDevice *cp)
4083 {
4084         dev->nErasedBlocks = cp->nErasedBlocks;
4085         dev->allocationBlock = cp->allocationBlock;
4086         dev->allocationPage = cp->allocationPage;
4087         dev->nFreeChunks = cp->nFreeChunks;
4088
4089         dev->nDeletedFiles = cp->nDeletedFiles;
4090         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4091         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4092         dev->sequenceNumber = cp->sequenceNumber;
4093         dev->oldestDirtySequence = cp->oldestDirtySequence;
4094 }
4095
4096
4097 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4098 {
4099         yaffs_CheckpointDevice cp;
4100         __u32 nBytes;
4101         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4102
4103         int ok;
4104
4105         /* Write device runtime values*/
4106         yaffs_DeviceToCheckpointDevice(&cp,dev);
4107         cp.structType = sizeof(cp);
4108
4109         ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4110
4111         /* Write block info */
4112         if(ok) {
4113                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4114                 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
4115         }
4116
4117         /* Write chunk bits */
4118         if(ok) {
4119                 nBytes = nBlocks * dev->chunkBitmapStride;
4120                 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
4121         }
4122         return   ok ? 1 : 0;
4123
4124 }
4125
4126 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4127 {
4128         yaffs_CheckpointDevice cp;
4129         __u32 nBytes;
4130         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4131
4132         int ok;
4133
4134         ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4135         if(!ok)
4136                 return 0;
4137
4138         if(cp.structType != sizeof(cp))
4139                 return 0;
4140
4141
4142         yaffs_CheckpointDeviceToDevice(dev,&cp);
4143
4144         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4145
4146         ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
4147
4148         if(!ok)
4149                 return 0;
4150         nBytes = nBlocks * dev->chunkBitmapStride;
4151
4152         ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
4153
4154         return ok ? 1 : 0;
4155 }
4156
4157 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4158                                            yaffs_Object *obj)
4159 {
4160
4161         cp->objectId = obj->objectId;
4162         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4163         cp->chunkId = obj->chunkId;
4164         cp->variantType = obj->variantType;
4165         cp->deleted = obj->deleted;
4166         cp->softDeleted = obj->softDeleted;
4167         cp->unlinked = obj->unlinked;
4168         cp->fake = obj->fake;
4169         cp->renameAllowed = obj->renameAllowed;
4170         cp->unlinkAllowed = obj->unlinkAllowed;
4171         cp->serial = obj->serial;
4172         cp->nDataChunks = obj->nDataChunks;
4173
4174         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4175                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4176         else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4177                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4178 }
4179
4180 static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
4181 {
4182
4183         yaffs_Object *parent;
4184
4185         obj->objectId = cp->objectId;
4186
4187         if(cp->parentId)
4188                 parent = yaffs_FindOrCreateObjectByNumber(
4189                                         obj->myDev,
4190                                         cp->parentId,
4191                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4192         else
4193                 parent = NULL;
4194
4195         if(parent)
4196                 yaffs_AddObjectToDirectory(parent, obj);
4197
4198         obj->chunkId = cp->chunkId;
4199         obj->variantType = cp->variantType;
4200         obj->deleted = cp->deleted;
4201         obj->softDeleted = cp->softDeleted;
4202         obj->unlinked = cp->unlinked;
4203         obj->fake = cp->fake;
4204         obj->renameAllowed = cp->renameAllowed;
4205         obj->unlinkAllowed = cp->unlinkAllowed;
4206         obj->serial = cp->serial;
4207         obj->nDataChunks = cp->nDataChunks;
4208
4209         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4210                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4211         else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4212                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4213
4214         if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
4215                 obj->lazyLoaded = 1;
4216 }
4217
4218
4219
4220 static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
4221                                         __u32 level, int chunkOffset)
4222 {
4223         int i;
4224         yaffs_Device *dev = in->myDev;
4225         int ok = 1;
4226         int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4227
4228         if (tn) {
4229                 if (level > 0) {
4230
4231                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
4232                                 if (tn->internal[i]) {
4233                                         ok = yaffs_CheckpointTnodeWorker(in,
4234                                                         tn->internal[i],
4235                                                         level - 1,
4236                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4237                                 }
4238                         }
4239                 } else if (level == 0) {
4240                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4241                         /* printf("write tnode at %d\n",baseOffset); */
4242                         ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
4243                         if(ok)
4244                                 ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
4245                 }
4246         }
4247
4248         return ok;
4249
4250 }
4251
4252 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4253 {
4254         __u32 endMarker = ~0;
4255         int ok = 1;
4256
4257         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4258                 ok = yaffs_CheckpointTnodeWorker(obj,
4259                                             obj->variant.fileVariant.top,
4260                                             obj->variant.fileVariant.topLevel,
4261                                             0);
4262                 if(ok)
4263                         ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
4264                                 sizeof(endMarker));
4265         }
4266
4267         return ok ? 1 : 0;
4268 }
4269
4270 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4271 {
4272         __u32 baseChunk;
4273         int ok = 1;
4274         yaffs_Device *dev = obj->myDev;
4275         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4276         yaffs_Tnode *tn;
4277         int nread = 0;
4278
4279         ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4280
4281         while(ok && (~baseChunk)){
4282                 nread++;
4283                 /* Read level 0 tnode */
4284
4285
4286                 /* printf("read  tnode at %d\n",baseChunk); */
4287                 tn = yaffs_GetTnodeRaw(dev);
4288                 if(tn)
4289                         ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
4290                               (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
4291                 else
4292                         ok = 0;
4293
4294                 if(tn && ok){
4295                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4296                                                         fileStructPtr,
4297                                                         baseChunk,
4298                                                         tn) ? 1 : 0;
4299
4300                 }
4301
4302                 if(ok)
4303                         ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4304
4305         }
4306
4307         T(YAFFS_TRACE_CHECKPOINT,(
4308                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4309                 nread,baseChunk,ok));
4310
4311         return ok ? 1 : 0;
4312 }
4313
4314
4315 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4316 {
4317         yaffs_Object *obj;
4318         yaffs_CheckpointObject cp;
4319         int i;
4320         int ok = 1;
4321         struct list_head *lh;
4322
4323
4324         /* Iterate through the objects in each hash entry,
4325          * dumping them to the checkpointing stream.
4326          */
4327
4328          for(i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++){
4329                 list_for_each(lh, &dev->objectBucket[i].list) {
4330                         if (lh) {
4331                                 obj = list_entry(lh, yaffs_Object, hashLink);
4332                                 if (!obj->deferedFree) {
4333                                         yaffs_ObjectToCheckpointObject(&cp,obj);
4334                                         cp.structType = sizeof(cp);
4335
4336                                         T(YAFFS_TRACE_CHECKPOINT,(
4337                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4338                                                 cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
4339
4340                                         ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4341
4342                                         if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4343                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4344                                         }
4345                                 }
4346                         }
4347                 }
4348          }
4349
4350          /* Dump end of list */
4351         memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
4352         cp.structType = sizeof(cp);
4353
4354         if(ok)
4355                 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4356
4357         return ok ? 1 : 0;
4358 }
4359
4360 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4361 {
4362         yaffs_Object *obj;
4363         yaffs_CheckpointObject cp;
4364         int ok = 1;
4365         int done = 0;
4366         yaffs_Object *hardList = NULL;
4367
4368         while(ok && !done) {
4369                 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4370                 if(cp.structType != sizeof(cp)) {
4371                         T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
4372                                 cp.structType,sizeof(cp),ok));
4373                         ok = 0;
4374                 }
4375
4376                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4377                         cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
4378
4379                 if(ok && cp.objectId == ~0)
4380                         done = 1;
4381                 else if(ok){
4382                         obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
4383                         if(obj) {
4384                                 yaffs_CheckpointObjectToObject(obj,&cp);
4385                                 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4386                                         ok = yaffs_ReadCheckpointTnodes(obj);
4387                                 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4388                                         obj->hardLinks.next =
4389                                                     (struct list_head *)
4390                                                     hardList;
4391                                         hardList = obj;
4392                                 }
4393
4394                         }
4395                 }
4396         }
4397
4398         if(ok)
4399                 yaffs_HardlinkFixup(dev,hardList);
4400
4401         return ok ? 1 : 0;
4402 }
4403
4404 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4405 {
4406         __u32 checkpointSum;
4407         int ok;
4408
4409         yaffs_GetCheckpointSum(dev,&checkpointSum);
4410
4411         ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
4412
4413         if(!ok)
4414                 return 0;
4415
4416         return 1;
4417 }
4418
4419 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4420 {
4421         __u32 checkpointSum0;
4422         __u32 checkpointSum1;
4423         int ok;
4424
4425         yaffs_GetCheckpointSum(dev,&checkpointSum0);
4426
4427         ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4428
4429         if(!ok)
4430                 return 0;
4431
4432         if(checkpointSum0 != checkpointSum1)
4433                 return 0;
4434
4435         return 1;
4436 }
4437
4438
4439 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4440 {
4441
4442         int ok = 1;
4443
4444         if(dev->skipCheckpointWrite || !dev->isYaffs2){
4445                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
4446                 ok = 0;
4447         }
4448
4449         if(ok)
4450                 ok = yaffs_CheckpointOpen(dev,1);
4451
4452         if(ok){
4453                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4454                 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
4455         }
4456         if(ok){
4457                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
4458                 ok = yaffs_WriteCheckpointDevice(dev);
4459         }
4460         if(ok){
4461                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
4462                 ok = yaffs_WriteCheckpointObjects(dev);
4463         }
4464         if(ok){
4465                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4466                 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
4467         }
4468
4469         if(ok){
4470                 ok = yaffs_WriteCheckpointSum(dev);
4471         }
4472
4473
4474         if(!yaffs_CheckpointClose(dev))
4475                  ok = 0;
4476
4477         if(ok)
4478                 dev->isCheckpointed = 1;
4479          else
4480                 dev->isCheckpointed = 0;
4481
4482         return dev->isCheckpointed;
4483 }
4484
4485 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4486 {
4487         int ok = 1;
4488
4489         if(dev->skipCheckpointRead || !dev->isYaffs2){
4490                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
4491                 ok = 0;
4492         }
4493
4494         if(ok)
4495                 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
4496
4497         if(ok){
4498                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4499                 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
4500         }
4501         if(ok){
4502                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
4503                 ok = yaffs_ReadCheckpointDevice(dev);
4504         }
4505         if(ok){
4506                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
4507                 ok = yaffs_ReadCheckpointObjects(dev);
4508         }
4509         if(ok){
4510                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4511                 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
4512         }
4513
4514         if(ok){
4515                 ok = yaffs_ReadCheckpointSum(dev);
4516                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
4517         }
4518
4519         if(!yaffs_CheckpointClose(dev))
4520                 ok = 0;
4521
4522         if(ok)
4523                 dev->isCheckpointed = 1;
4524          else
4525                 dev->isCheckpointed = 0;
4526
4527         return ok ? 1 : 0;
4528
4529 }
4530
4531 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4532 {
4533         if(dev->isCheckpointed ||
4534            dev->blocksInCheckpoint > 0){
4535                 dev->isCheckpointed = 0;
4536                 yaffs_CheckpointInvalidateStream(dev);
4537                 if(dev->superBlock && dev->markSuperBlockDirty)
4538                         dev->markSuperBlockDirty(dev->superBlock);
4539         }
4540 }
4541
4542
4543 int yaffs_CheckpointSave(yaffs_Device *dev)
4544 {
4545
4546         T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4547
4548         yaffs_VerifyObjects(dev);
4549         yaffs_VerifyBlocks(dev);
4550         yaffs_VerifyFreeChunks(dev);
4551
4552         if(!dev->isCheckpointed) {
4553                 yaffs_InvalidateCheckpoint(dev);
4554                 yaffs_WriteCheckpointData(dev);
4555         }
4556
4557         T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4558
4559         return dev->isCheckpointed;
4560 }
4561
4562 int yaffs_CheckpointRestore(yaffs_Device *dev)
4563 {
4564         int retval;
4565         T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4566
4567         retval = yaffs_ReadCheckpointData(dev);
4568
4569         if(dev->isCheckpointed){
4570                 yaffs_VerifyObjects(dev);
4571                 yaffs_VerifyBlocks(dev);
4572                 yaffs_VerifyFreeChunks(dev);
4573         }
4574
4575         T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4576
4577         return retval;
4578 }
4579
4580 /*--------------------- File read/write ------------------------
4581  * Read and write have very similar structures.
4582  * In general the read/write has three parts to it
4583  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4584  * Some complete chunks
4585  * An incomplete chunk to end off with
4586  *
4587  * Curve-balls: the first chunk might also be the last chunk.
4588  */
4589
4590 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
4591                            int nBytes)
4592 {
4593
4594         int chunk;
4595         int start;
4596         int nToCopy;
4597         int n = nBytes;
4598         int nDone = 0;
4599         yaffs_ChunkCache *cache;
4600
4601         yaffs_Device *dev;
4602
4603         dev = in->myDev;
4604
4605         while (n > 0) {
4606                 //chunk = offset / dev->nDataBytesPerChunk + 1;
4607                 //start = offset % dev->nDataBytesPerChunk;
4608                 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4609                 chunk++;
4610
4611                 /* OK now check for the curveball where the start and end are in
4612                  * the same chunk.
4613                  */
4614                 if ((start + n) < dev->nDataBytesPerChunk) {
4615                         nToCopy = n;
4616                 } else {
4617                         nToCopy = dev->nDataBytesPerChunk - start;
4618                 }
4619
4620                 cache = yaffs_FindChunkCache(in, chunk);
4621
4622                 /* If the chunk is already in the cache or it is less than a whole chunk
4623                  * then use the cache (if there is caching)
4624                  * else bypass the cache.
4625                  */
4626                 if (cache || nToCopy != dev->nDataBytesPerChunk) {
4627                         if (dev->nShortOpCaches > 0) {
4628
4629                                 /* If we can't find the data in the cache, then load it up. */
4630
4631                                 if (!cache) {
4632                                         cache = yaffs_GrabChunkCache(in->myDev);
4633                                         cache->object = in;
4634                                         cache->chunkId = chunk;
4635                                         cache->dirty = 0;
4636                                         cache->locked = 0;
4637                                         yaffs_ReadChunkDataFromObject(in, chunk,
4638                                                                       cache->
4639                                                                       data);
4640                                         cache->nBytes = 0;
4641                                 }
4642
4643                                 yaffs_UseChunkCache(dev, cache, 0);
4644
4645                                 cache->locked = 1;
4646
4647 #ifdef CONFIG_YAFFS_WINCE
4648                                 yfsd_UnlockYAFFS(TRUE);
4649 #endif
4650                                 memcpy(buffer, &cache->data[start], nToCopy);
4651
4652 #ifdef CONFIG_YAFFS_WINCE
4653                                 yfsd_LockYAFFS(TRUE);
4654 #endif
4655                                 cache->locked = 0;
4656                         } else {
4657                                 /* Read into the local buffer then copy..*/
4658
4659                                 __u8 *localBuffer =
4660                                     yaffs_GetTempBuffer(dev, __LINE__);
4661                                 yaffs_ReadChunkDataFromObject(in, chunk,
4662                                                               localBuffer);
4663 #ifdef CONFIG_YAFFS_WINCE
4664                                 yfsd_UnlockYAFFS(TRUE);
4665 #endif
4666                                 memcpy(buffer, &localBuffer[start], nToCopy);
4667
4668 #ifdef CONFIG_YAFFS_WINCE
4669                                 yfsd_LockYAFFS(TRUE);
4670 #endif
4671                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4672                                                         __LINE__);
4673                         }
4674
4675                 } else {
4676 #ifdef CONFIG_YAFFS_WINCE
4677                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4678
4679                         /* Under WinCE can't do direct transfer. Need to use a local buffer.
4680                          * This is because we otherwise screw up WinCE's memory mapper
4681                          */
4682                         yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
4683
4684 #ifdef CONFIG_YAFFS_WINCE
4685                         yfsd_UnlockYAFFS(TRUE);
4686 #endif
4687                         memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
4688
4689 #ifdef CONFIG_YAFFS_WINCE
4690                         yfsd_LockYAFFS(TRUE);
4691                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4692 #endif
4693
4694 #else
4695                         /* A full chunk. Read directly into the supplied buffer. */
4696                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4697 #endif
4698                 }
4699
4700                 n -= nToCopy;
4701                 offset += nToCopy;
4702                 buffer += nToCopy;
4703                 nDone += nToCopy;
4704
4705         }
4706
4707         return nDone;
4708 }
4709
4710 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
4711                           int nBytes, int writeThrough)
4712 {
4713
4714         int chunk;
4715         int start;
4716         int nToCopy;
4717         int n = nBytes;
4718         int nDone = 0;
4719         int nToWriteBack;
4720         int startOfWrite = offset;
4721         int chunkWritten = 0;
4722         int nBytesRead;
4723
4724         yaffs_Device *dev;
4725
4726         dev = in->myDev;
4727
4728         while (n > 0 && chunkWritten >= 0) {
4729                 //chunk = offset / dev->nDataBytesPerChunk + 1;
4730                 //start = offset % dev->nDataBytesPerChunk;
4731                 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4732                 chunk++;
4733
4734                 /* OK now check for the curveball where the start and end are in
4735                  * the same chunk.
4736                  */
4737
4738                 if ((start + n) < dev->nDataBytesPerChunk) {
4739                         nToCopy = n;
4740
4741                         /* Now folks, to calculate how many bytes to write back....
4742                          * If we're overwriting and not writing to then end of file then
4743                          * we need to write back as much as was there before.
4744                          */
4745
4746                         nBytesRead =
4747                             in->variant.fileVariant.fileSize -
4748                             ((chunk - 1) * dev->nDataBytesPerChunk);
4749
4750                         if (nBytesRead > dev->nDataBytesPerChunk) {
4751                                 nBytesRead = dev->nDataBytesPerChunk;
4752                         }
4753
4754                         nToWriteBack =
4755                             (nBytesRead >
4756                              (start + n)) ? nBytesRead : (start + n);
4757
4758                 } else {
4759                         nToCopy = dev->nDataBytesPerChunk - start;
4760                         nToWriteBack = dev->nDataBytesPerChunk;
4761                 }
4762
4763                 if (nToCopy != dev->nDataBytesPerChunk) {
4764                         /* An incomplete start or end chunk (or maybe both start and end chunk) */
4765                         if (dev->nShortOpCaches > 0) {
4766                                 yaffs_ChunkCache *cache;
4767                                 /* If we can't find the data in the cache, then load the cache */
4768                                 cache = yaffs_FindChunkCache(in, chunk);
4769
4770                                 if (!cache
4771                                     && yaffs_CheckSpaceForAllocation(in->
4772                                                                      myDev)) {
4773                                         cache = yaffs_GrabChunkCache(in->myDev);
4774                                         cache->object = in;
4775                                         cache->chunkId = chunk;
4776                                         cache->dirty = 0;
4777                                         cache->locked = 0;
4778                                         yaffs_ReadChunkDataFromObject(in, chunk,
4779                                                                       cache->
4780                                                                       data);
4781                                 }
4782                                 else if(cache &&
4783                                         !cache->dirty &&
4784                                         !yaffs_CheckSpaceForAllocation(in->myDev)){
4785                                         /* Drop the cache if it was a read cache item and
4786                                          * no space check has been made for it.
4787                                          */
4788                                          cache = NULL;
4789                                 }
4790
4791                                 if (cache) {
4792                                         yaffs_UseChunkCache(dev, cache, 1);
4793                                         cache->locked = 1;
4794 #ifdef CONFIG_YAFFS_WINCE
4795                                         yfsd_UnlockYAFFS(TRUE);
4796 #endif
4797
4798                                         memcpy(&cache->data[start], buffer,
4799                                                nToCopy);
4800
4801 #ifdef CONFIG_YAFFS_WINCE
4802                                         yfsd_LockYAFFS(TRUE);
4803 #endif
4804                                         cache->locked = 0;
4805                                         cache->nBytes = nToWriteBack;
4806
4807                                         if (writeThrough) {
4808                                                 chunkWritten =
4809                                                     yaffs_WriteChunkDataToObject
4810                                                     (cache->object,
4811                                                      cache->chunkId,
4812                                                      cache->data, cache->nBytes,
4813                                                      1);
4814                                                 cache->dirty = 0;
4815                                         }
4816
4817                                 } else {
4818                                         chunkWritten = -1;      /* fail the write */
4819                                 }
4820                         } else {
4821                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
4822                                  * Read into the local buffer then copy, then copy over and write back.
4823                                  */
4824
4825                                 __u8 *localBuffer =
4826                                     yaffs_GetTempBuffer(dev, __LINE__);
4827
4828                                 yaffs_ReadChunkDataFromObject(in, chunk,
4829                                                               localBuffer);
4830
4831 #ifdef CONFIG_YAFFS_WINCE
4832                                 yfsd_UnlockYAFFS(TRUE);
4833 #endif
4834
4835                                 memcpy(&localBuffer[start], buffer, nToCopy);
4836
4837 #ifdef CONFIG_YAFFS_WINCE
4838                                 yfsd_LockYAFFS(TRUE);
4839 #endif
4840                                 chunkWritten =
4841                                     yaffs_WriteChunkDataToObject(in, chunk,
4842                                                                  localBuffer,
4843                                                                  nToWriteBack,
4844                                                                  0);
4845
4846                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4847                                                         __LINE__);
4848
4849                         }
4850
4851                 } else {
4852
4853 #ifdef CONFIG_YAFFS_WINCE
4854                         /* Under WinCE can't do direct transfer. Need to use a local buffer.
4855                          * This is because we otherwise screw up WinCE's memory mapper
4856                          */
4857                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4858 #ifdef CONFIG_YAFFS_WINCE
4859                         yfsd_UnlockYAFFS(TRUE);
4860 #endif
4861                         memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
4862 #ifdef CONFIG_YAFFS_WINCE
4863                         yfsd_LockYAFFS(TRUE);
4864 #endif
4865                         chunkWritten =
4866                             yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
4867                                                          dev->nDataBytesPerChunk,
4868                                                          0);
4869                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4870 #else
4871                         /* A full chunk. Write directly from the supplied buffer. */
4872                         chunkWritten =
4873                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
4874                                                          dev->nDataBytesPerChunk,
4875                                                          0);
4876 #endif
4877                         /* Since we've overwritten the cached data, we better invalidate it. */
4878                         yaffs_InvalidateChunkCache(in, chunk);
4879                 }
4880
4881                 if (chunkWritten >= 0) {
4882                         n -= nToCopy;
4883                         offset += nToCopy;
4884                         buffer += nToCopy;
4885                         nDone += nToCopy;
4886                 }
4887
4888         }
4889
4890         /* Update file object */
4891
4892         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
4893                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4894         }
4895
4896         in->dirty = 1;
4897
4898         return nDone;
4899 }
4900
4901
4902 /* ---------------------- File resizing stuff ------------------ */
4903
4904 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
4905 {
4906
4907         yaffs_Device *dev = in->myDev;
4908         int oldFileSize = in->variant.fileVariant.fileSize;
4909
4910         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4911
4912         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4913             dev->nDataBytesPerChunk;
4914         int i;
4915         int chunkId;
4916
4917         /* Delete backwards so that we don't end up with holes if
4918          * power is lost part-way through the operation.
4919          */
4920         for (i = lastDel; i >= startDel; i--) {
4921                 /* NB this could be optimised somewhat,
4922                  * eg. could retrieve the tags and write them without
4923                  * using yaffs_DeleteChunk
4924                  */
4925
4926                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4927                 if (chunkId > 0) {
4928                         if (chunkId <
4929                             (dev->internalStartBlock * dev->nChunksPerBlock)
4930                             || chunkId >=
4931                             ((dev->internalEndBlock +
4932                               1) * dev->nChunksPerBlock)) {
4933                                 T(YAFFS_TRACE_ALWAYS,
4934                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
4935                                    chunkId, i));
4936                         } else {
4937                                 in->nDataChunks--;
4938                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4939                         }
4940                 }
4941         }
4942
4943 }
4944
4945 int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
4946 {
4947
4948         int oldFileSize = in->variant.fileVariant.fileSize;
4949         int newSizeOfPartialChunk;
4950         int newFullChunks;
4951
4952         yaffs_Device *dev = in->myDev;
4953
4954         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4955
4956         yaffs_FlushFilesChunkCache(in);
4957         yaffs_InvalidateWholeChunkCache(in);
4958
4959         yaffs_CheckGarbageCollection(dev);
4960
4961         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
4962                 return yaffs_GetFileSize(in);
4963         }
4964
4965         if (newSize == oldFileSize) {
4966                 return oldFileSize;
4967         }
4968
4969         if (newSize < oldFileSize) {
4970
4971                 yaffs_PruneResizedChunks(in, newSize);
4972
4973                 if (newSizeOfPartialChunk != 0) {
4974                         int lastChunk = 1 + newFullChunks;
4975
4976                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4977
4978                         /* Got to read and rewrite the last chunk with its new size and zero pad */
4979                         yaffs_ReadChunkDataFromObject(in, lastChunk,
4980                                                       localBuffer);
4981
4982                         memset(localBuffer + newSizeOfPartialChunk, 0,
4983                                dev->nDataBytesPerChunk - newSizeOfPartialChunk);
4984
4985                         yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
4986                                                      newSizeOfPartialChunk, 1);
4987
4988                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4989                 }
4990
4991                 in->variant.fileVariant.fileSize = newSize;
4992
4993                 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
4994         } else {
4995                 /* newsSize > oldFileSize */
4996                 in->variant.fileVariant.fileSize = newSize;
4997         }
4998
4999
5000
5001         /* Write a new object header.
5002          * show we've shrunk the file, if need be
5003          * Do this only if the file is not in the deleted directories.
5004          */
5005         if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5006             in->parent->objectId != YAFFS_OBJECTID_DELETED) {
5007                 yaffs_UpdateObjectHeader(in, NULL, 0,
5008                                          (newSize < oldFileSize) ? 1 : 0, 0);
5009         }
5010
5011         return newSize;
5012 }
5013
5014 loff_t yaffs_GetFileSize(yaffs_Object * obj)
5015 {
5016         obj = yaffs_GetEquivalentObject(obj);
5017
5018         switch (obj->variantType) {
5019         case YAFFS_OBJECT_TYPE_FILE:
5020                 return obj->variant.fileVariant.fileSize;
5021         case YAFFS_OBJECT_TYPE_SYMLINK:
5022                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5023         default:
5024                 return 0;
5025         }
5026 }
5027
5028
5029
5030 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
5031 {
5032         int retVal;
5033         if (in->dirty) {
5034                 yaffs_FlushFilesChunkCache(in);
5035                 if (updateTime) {
5036 #ifdef CONFIG_YAFFS_WINCE
5037                         yfsd_WinFileTimeNow(in->win_mtime);
5038 #else
5039
5040                         in->yst_mtime = Y_CURRENT_TIME;
5041
5042 #endif
5043                 }
5044
5045                 retVal =
5046                     (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5047                      0) ? YAFFS_OK : YAFFS_FAIL;
5048         } else {
5049                 retVal = YAFFS_OK;
5050         }
5051
5052         return retVal;
5053
5054 }
5055
5056 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
5057 {
5058
5059         /* First off, invalidate the file's data in the cache, without flushing. */
5060         yaffs_InvalidateWholeChunkCache(in);
5061
5062         if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5063                 /* Move to the unlinked directory so we have a record that it was deleted. */
5064                 yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
5065
5066         }
5067
5068         yaffs_RemoveObjectFromDirectory(in);
5069         yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
5070         in->chunkId = -1;
5071
5072         yaffs_FreeObject(in);
5073         return YAFFS_OK;
5074
5075 }
5076
5077 /* yaffs_DeleteFile deletes the whole file data
5078  * and the inode associated with the file.
5079  * It does not delete the links associated with the file.
5080  */
5081 static int yaffs_UnlinkFile(yaffs_Object * in)
5082 {
5083
5084         int retVal;
5085         int immediateDeletion = 0;
5086
5087         if (1) {
5088 #ifdef __KERNEL__
5089                 if (!in->myInode) {
5090                         immediateDeletion = 1;
5091
5092                 }
5093 #else
5094                 if (in->inUse <= 0) {
5095                         immediateDeletion = 1;
5096
5097                 }
5098 #endif
5099                 if (immediateDeletion) {
5100                         retVal =
5101                             yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5102                                                    "deleted", 0, 0);
5103                         T(YAFFS_TRACE_TRACING,
5104                           (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5105                            in->objectId));
5106                         in->deleted = 1;
5107                         in->myDev->nDeletedFiles++;
5108                         if (0 && in->myDev->isYaffs2) {
5109                                 yaffs_ResizeFile(in, 0);
5110                         }
5111                         yaffs_SoftDeleteFile(in);
5112                 } else {
5113                         retVal =
5114                             yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5115                                                    "unlinked", 0, 0);
5116                 }
5117
5118         }
5119         return retVal;
5120 }
5121
5122 int yaffs_DeleteFile(yaffs_Object * in)
5123 {
5124         int retVal = YAFFS_OK;
5125
5126         if (in->nDataChunks > 0) {
5127                 /* Use soft deletion if there is data in the file */
5128                 if (!in->unlinked) {
5129                         retVal = yaffs_UnlinkFile(in);
5130                 }
5131                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5132                         in->deleted = 1;
5133                         in->myDev->nDeletedFiles++;
5134                         yaffs_SoftDeleteFile(in);
5135                 }
5136                 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
5137         } else {
5138                 /* The file has no data chunks so we toss it immediately */
5139                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5140                 in->variant.fileVariant.top = NULL;
5141                 yaffs_DoGenericObjectDeletion(in);
5142
5143                 return YAFFS_OK;
5144         }
5145 }
5146
5147 static int yaffs_DeleteDirectory(yaffs_Object * in)
5148 {
5149         /* First check that the directory is empty. */
5150         if (list_empty(&in->variant.directoryVariant.children)) {
5151                 return yaffs_DoGenericObjectDeletion(in);
5152         }
5153
5154         return YAFFS_FAIL;
5155
5156 }
5157
5158 static int yaffs_DeleteSymLink(yaffs_Object * in)
5159 {
5160         YFREE(in->variant.symLinkVariant.alias);
5161
5162         return yaffs_DoGenericObjectDeletion(in);
5163 }
5164
5165 static int yaffs_DeleteHardLink(yaffs_Object * in)
5166 {
5167         /* remove this hardlink from the list assocaited with the equivalent
5168          * object
5169          */
5170         list_del(&in->hardLinks);
5171         return yaffs_DoGenericObjectDeletion(in);
5172 }
5173
5174 static void yaffs_DestroyObject(yaffs_Object * obj)
5175 {
5176         switch (obj->variantType) {
5177         case YAFFS_OBJECT_TYPE_FILE:
5178                 yaffs_DeleteFile(obj);
5179                 break;
5180         case YAFFS_OBJECT_TYPE_DIRECTORY:
5181                 yaffs_DeleteDirectory(obj);
5182                 break;
5183         case YAFFS_OBJECT_TYPE_SYMLINK:
5184                 yaffs_DeleteSymLink(obj);
5185                 break;
5186         case YAFFS_OBJECT_TYPE_HARDLINK:
5187                 yaffs_DeleteHardLink(obj);
5188                 break;
5189         case YAFFS_OBJECT_TYPE_SPECIAL:
5190                 yaffs_DoGenericObjectDeletion(obj);
5191                 break;
5192         case YAFFS_OBJECT_TYPE_UNKNOWN:
5193                 break;          /* should not happen. */
5194         }
5195 }
5196
5197 static int yaffs_UnlinkWorker(yaffs_Object * obj)
5198 {
5199
5200         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5201                 return yaffs_DeleteHardLink(obj);
5202         } else if (!list_empty(&obj->hardLinks)) {
5203                 /* Curve ball: We're unlinking an object that has a hardlink.
5204                  *
5205                  * This problem arises because we are not strictly following
5206                  * The Linux link/inode model.
5207                  *
5208                  * We can't really delete the object.
5209                  * Instead, we do the following:
5210                  * - Select a hardlink.
5211                  * - Unhook it from the hard links
5212                  * - Unhook it from its parent directory (so that the rename can work)
5213                  * - Rename the object to the hardlink's name.
5214                  * - Delete the hardlink
5215                  */
5216
5217                 yaffs_Object *hl;
5218                 int retVal;
5219                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5220
5221                 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5222
5223                 list_del_init(&hl->hardLinks);
5224                 list_del_init(&hl->siblings);
5225
5226                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5227
5228                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5229
5230                 if (retVal == YAFFS_OK) {
5231                         retVal = yaffs_DoGenericObjectDeletion(hl);
5232                 }
5233                 return retVal;
5234
5235         } else {
5236                 switch (obj->variantType) {
5237                 case YAFFS_OBJECT_TYPE_FILE:
5238                         return yaffs_UnlinkFile(obj);
5239                         break;
5240                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5241                         return yaffs_DeleteDirectory(obj);
5242                         break;
5243                 case YAFFS_OBJECT_TYPE_SYMLINK:
5244                         return yaffs_DeleteSymLink(obj);
5245                         break;
5246                 case YAFFS_OBJECT_TYPE_SPECIAL:
5247                         return yaffs_DoGenericObjectDeletion(obj);
5248                         break;
5249                 case YAFFS_OBJECT_TYPE_HARDLINK:
5250                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5251                 default:
5252                         return YAFFS_FAIL;
5253                 }
5254         }
5255 }
5256
5257
5258 static int yaffs_UnlinkObject( yaffs_Object *obj)
5259 {
5260
5261         if (obj && obj->unlinkAllowed) {
5262                 return yaffs_UnlinkWorker(obj);
5263         }
5264
5265         return YAFFS_FAIL;
5266
5267 }
5268 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
5269 {
5270         yaffs_Object *obj;
5271
5272         obj = yaffs_FindObjectByName(dir, name);
5273         return yaffs_UnlinkObject(obj);
5274 }
5275
5276 /*----------------------- Initialisation Scanning ---------------------- */
5277
5278 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
5279                                        int backwardScanning)
5280 {
5281         yaffs_Object *obj;
5282
5283         if (!backwardScanning) {
5284                 /* Handle YAFFS1 forward scanning case
5285                  * For YAFFS1 we always do the deletion
5286                  */
5287
5288         } else {
5289                 /* Handle YAFFS2 case (backward scanning)
5290                  * If the shadowed object exists then ignore.
5291                  */
5292                 if (yaffs_FindObjectByNumber(dev, objId)) {
5293                         return;
5294                 }
5295         }
5296
5297         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5298          * We put it in unlinked dir to be cleaned up after the scanning
5299          */
5300         obj =
5301             yaffs_FindOrCreateObjectByNumber(dev, objId,
5302                                              YAFFS_OBJECT_TYPE_FILE);
5303         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5304         obj->variant.fileVariant.shrinkSize = 0;
5305         obj->valid = 1;         /* So that we don't read any other info for this file */
5306
5307 }
5308
5309 typedef struct {
5310         int seq;
5311         int block;
5312 } yaffs_BlockIndex;
5313
5314
5315 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5316 {
5317         yaffs_Object *hl;
5318         yaffs_Object *in;
5319
5320         while (hardList) {
5321                 hl = hardList;
5322                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5323
5324                 in = yaffs_FindObjectByNumber(dev,
5325                                               hl->variant.hardLinkVariant.
5326                                               equivalentObjectId);
5327
5328                 if (in) {
5329                         /* Add the hardlink pointers */
5330                         hl->variant.hardLinkVariant.equivalentObject = in;
5331                         list_add(&hl->hardLinks, &in->hardLinks);
5332                 } else {
5333                         /* Todo Need to report/handle this better.
5334                          * Got a problem... hardlink to a non-existant object
5335                          */
5336                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5337                         INIT_LIST_HEAD(&hl->hardLinks);
5338
5339                 }
5340
5341         }
5342
5343 }
5344
5345
5346
5347
5348
5349 static int ybicmp(const void *a, const void *b){
5350     register int aseq = ((yaffs_BlockIndex *)a)->seq;
5351     register int bseq = ((yaffs_BlockIndex *)b)->seq;
5352     register int ablock = ((yaffs_BlockIndex *)a)->block;
5353     register int bblock = ((yaffs_BlockIndex *)b)->block;
5354     if( aseq == bseq )
5355         return ablock - bblock;
5356     else
5357         return aseq - bseq;
5358
5359 }
5360
5361 static int yaffs_Scan(yaffs_Device * dev)
5362 {
5363         yaffs_ExtendedTags tags;
5364         int blk;
5365         int blockIterator;
5366         int startIterator;
5367         int endIterator;
5368         int nBlocksToScan = 0;
5369         int result;
5370
5371         int chunk;
5372         int c;
5373         int deleted;
5374         yaffs_BlockState state;
5375         yaffs_Object *hardList = NULL;
5376         yaffs_BlockInfo *bi;
5377         int sequenceNumber;
5378         yaffs_ObjectHeader *oh;
5379         yaffs_Object *in;
5380         yaffs_Object *parent;
5381         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5382
5383         int alloc_failed = 0;
5384
5385
5386         __u8 *chunkData;
5387
5388         yaffs_BlockIndex *blockIndex = NULL;
5389
5390         if (dev->isYaffs2) {
5391                 T(YAFFS_TRACE_SCAN,
5392                   (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
5393                 return YAFFS_FAIL;
5394         }
5395
5396         //TODO  Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
5397
5398         T(YAFFS_TRACE_SCAN,
5399           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
5400            dev->internalStartBlock, dev->internalEndBlock));
5401
5402         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5403
5404         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5405
5406         if (dev->isYaffs2) {
5407                 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5408                 if(!blockIndex)
5409                         return YAFFS_FAIL;
5410         }
5411
5412         /* Scan all the blocks to determine their state */
5413         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5414                 bi = yaffs_GetBlockInfo(dev, blk);
5415                 yaffs_ClearChunkBits(dev, blk);
5416                 bi->pagesInUse = 0;
5417                 bi->softDeletions = 0;
5418
5419                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5420
5421                 bi->blockState = state;
5422                 bi->sequenceNumber = sequenceNumber;
5423
5424                 T(YAFFS_TRACE_SCAN_DEBUG,
5425                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5426                    state, sequenceNumber));
5427
5428                 if (state == YAFFS_BLOCK_STATE_DEAD) {
5429                         T(YAFFS_TRACE_BAD_BLOCKS,
5430                           (TSTR("block %d is bad" TENDSTR), blk));
5431                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5432                         T(YAFFS_TRACE_SCAN_DEBUG,
5433                           (TSTR("Block empty " TENDSTR)));
5434                         dev->nErasedBlocks++;
5435                         dev->nFreeChunks += dev->nChunksPerBlock;
5436                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5437
5438                         /* Determine the highest sequence number */
5439                         if (dev->isYaffs2 &&
5440                             sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5441                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5442
5443                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
5444                                 blockIndex[nBlocksToScan].block = blk;
5445
5446                                 nBlocksToScan++;
5447
5448                                 if (sequenceNumber >= dev->sequenceNumber) {
5449                                         dev->sequenceNumber = sequenceNumber;
5450                                 }
5451                         } else if (dev->isYaffs2) {
5452                                 /* TODO: Nasty sequence number! */
5453                                 T(YAFFS_TRACE_SCAN,
5454                                   (TSTR
5455                                    ("Block scanning block %d has bad sequence number %d"
5456                                     TENDSTR), blk, sequenceNumber));
5457
5458                         }
5459                 }
5460         }
5461
5462         /* Sort the blocks
5463          * Dungy old bubble sort for now...
5464          */
5465         if (dev->isYaffs2) {
5466                 yaffs_BlockIndex temp;
5467                 int i;
5468                 int j;
5469
5470                 for (i = 0; i < nBlocksToScan; i++)
5471                         for (j = i + 1; j < nBlocksToScan; j++)
5472                                 if (blockIndex[i].seq > blockIndex[j].seq) {
5473                                         temp = blockIndex[j];
5474                                         blockIndex[j] = blockIndex[i];
5475                                         blockIndex[i] = temp;
5476                                 }
5477         }
5478
5479         /* Now scan the blocks looking at the data. */
5480         if (dev->isYaffs2) {
5481                 startIterator = 0;
5482                 endIterator = nBlocksToScan - 1;
5483                 T(YAFFS_TRACE_SCAN_DEBUG,
5484                   (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5485         } else {
5486                 startIterator = dev->internalStartBlock;
5487                 endIterator = dev->internalEndBlock;
5488         }
5489
5490         /* For each block.... */
5491         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5492              blockIterator++) {
5493
5494                 if (dev->isYaffs2) {
5495                         /* get the block to scan in the correct order */
5496                         blk = blockIndex[blockIterator].block;
5497                 } else {
5498                         blk = blockIterator;
5499                 }
5500
5501                 bi = yaffs_GetBlockInfo(dev, blk);
5502                 state = bi->blockState;
5503
5504                 deleted = 0;
5505
5506                 /* For each chunk in each block that needs scanning....*/
5507                 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5508                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5509                         /* Read the tags and decide what to do */
5510                         chunk = blk * dev->nChunksPerBlock + c;
5511
5512                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5513                                                         &tags);
5514
5515                         /* Let's have a good look at this chunk... */
5516
5517                         if (!dev->isYaffs2 && tags.chunkDeleted) {
5518                                 /* YAFFS1 only...
5519                                  * A deleted chunk
5520                                  */
5521                                 deleted++;
5522                                 dev->nFreeChunks++;
5523                                 /*T((" %d %d deleted\n",blk,c)); */
5524                         } else if (!tags.chunkUsed) {
5525                                 /* An unassigned chunk in the block
5526                                  * This means that either the block is empty or
5527                                  * this is the one being allocated from
5528                                  */
5529
5530                                 if (c == 0) {
5531                                         /* We're looking at the first chunk in the block so the block is unused */
5532                                         state = YAFFS_BLOCK_STATE_EMPTY;
5533                                         dev->nErasedBlocks++;
5534                                 } else {
5535                                         /* this is the block being allocated from */
5536                                         T(YAFFS_TRACE_SCAN,
5537                                           (TSTR
5538                                            (" Allocating from %d %d" TENDSTR),
5539                                            blk, c));
5540                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5541                                         dev->allocationBlock = blk;
5542                                         dev->allocationPage = c;
5543                                         dev->allocationBlockFinder = blk;
5544                                         /* Set it to here to encourage the allocator to go forth from here. */
5545
5546                                         /* Yaffs2 sanity check:
5547                                          * This should be the one with the highest sequence number
5548                                          */
5549                                         if (dev->isYaffs2
5550                                             && (dev->sequenceNumber !=
5551                                                 bi->sequenceNumber)) {
5552                                                 T(YAFFS_TRACE_ALWAYS,
5553                                                   (TSTR
5554                                                    ("yaffs: Allocation block %d was not highest sequence id:"
5555                                                     " block seq = %d, dev seq = %d"
5556                                                     TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
5557                                         }
5558                                 }
5559
5560                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5561                         } else if (tags.chunkId > 0) {
5562                                 /* chunkId > 0 so it is a data chunk... */
5563                                 unsigned int endpos;
5564
5565                                 yaffs_SetChunkBit(dev, blk, c);
5566                                 bi->pagesInUse++;
5567
5568                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5569                                                                       tags.
5570                                                                       objectId,
5571                                                                       YAFFS_OBJECT_TYPE_FILE);
5572                                 /* PutChunkIntoFile checks for a clash (two data chunks with
5573                                  * the same chunkId).
5574                                  */
5575
5576                                 if(!in)
5577                                         alloc_failed = 1;
5578
5579                                 if(in){
5580                                         if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
5581                                                 alloc_failed = 1;
5582                                 }
5583
5584                                 endpos =
5585                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5586                                     tags.byteCount;
5587                                 if (in &&
5588                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
5589                                     && in->variant.fileVariant.scannedFileSize <
5590                                     endpos) {
5591                                         in->variant.fileVariant.
5592                                             scannedFileSize = endpos;
5593                                         if (!dev->useHeaderFileSize) {
5594                                                 in->variant.fileVariant.
5595                                                     fileSize =
5596                                                     in->variant.fileVariant.
5597                                                     scannedFileSize;
5598                                         }
5599
5600                                 }
5601                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
5602                         } else {
5603                                 /* chunkId == 0, so it is an ObjectHeader.
5604                                  * Thus, we read in the object header and make the object
5605                                  */
5606                                 yaffs_SetChunkBit(dev, blk, c);
5607                                 bi->pagesInUse++;
5608
5609                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5610                                                                 chunkData,
5611                                                                 NULL);
5612
5613                                 oh = (yaffs_ObjectHeader *) chunkData;
5614
5615                                 in = yaffs_FindObjectByNumber(dev,
5616                                                               tags.objectId);
5617                                 if (in && in->variantType != oh->type) {
5618                                         /* This should not happen, but somehow
5619                                          * Wev'e ended up with an objectId that has been reused but not yet
5620                                          * deleted, and worse still it has changed type. Delete the old object.
5621                                          */
5622
5623                                         yaffs_DestroyObject(in);
5624
5625                                         in = 0;
5626                                 }
5627
5628                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5629                                                                       tags.
5630                                                                       objectId,
5631                                                                       oh->type);
5632
5633                                 if(!in)
5634                                         alloc_failed = 1;
5635
5636                                 if (in && oh->shadowsObject > 0) {
5637                                         yaffs_HandleShadowedObject(dev,
5638                                                                    oh->
5639                                                                    shadowsObject,
5640                                                                    0);
5641                                 }
5642
5643                                 if (in && in->valid) {
5644                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
5645
5646                                         unsigned existingSerial = in->serial;
5647                                         unsigned newSerial = tags.serialNumber;
5648
5649                                         if (dev->isYaffs2 ||
5650                                             ((existingSerial + 1) & 3) ==
5651                                             newSerial) {
5652                                                 /* Use new one - destroy the exisiting one */
5653                                                 yaffs_DeleteChunk(dev,
5654                                                                   in->chunkId,
5655                                                                   1, __LINE__);
5656                                                 in->valid = 0;
5657                                         } else {
5658                                                 /* Use existing - destroy this one. */
5659                                                 yaffs_DeleteChunk(dev, chunk, 1,
5660                                                                   __LINE__);
5661                                         }
5662                                 }
5663
5664                                 if (in && !in->valid &&
5665                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5666                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5667                                         /* We only load some info, don't fiddle with directory structure */
5668                                         in->valid = 1;
5669                                         in->variantType = oh->type;
5670
5671                                         in->yst_mode = oh->yst_mode;
5672 #ifdef CONFIG_YAFFS_WINCE
5673                                         in->win_atime[0] = oh->win_atime[0];
5674                                         in->win_ctime[0] = oh->win_ctime[0];
5675                                         in->win_mtime[0] = oh->win_mtime[0];
5676                                         in->win_atime[1] = oh->win_atime[1];
5677                                         in->win_ctime[1] = oh->win_ctime[1];
5678                                         in->win_mtime[1] = oh->win_mtime[1];
5679 #else
5680                                         in->yst_uid = oh->yst_uid;
5681                                         in->yst_gid = oh->yst_gid;
5682                                         in->yst_atime = oh->yst_atime;
5683                                         in->yst_mtime = oh->yst_mtime;
5684                                         in->yst_ctime = oh->yst_ctime;
5685                                         in->yst_rdev = oh->yst_rdev;
5686 #endif
5687                                         in->chunkId = chunk;
5688
5689                                 } else if (in && !in->valid) {
5690                                         /* we need to load this info */
5691
5692                                         in->valid = 1;
5693                                         in->variantType = oh->type;
5694
5695                                         in->yst_mode = oh->yst_mode;
5696 #ifdef CONFIG_YAFFS_WINCE
5697                                         in->win_atime[0] = oh->win_atime[0];
5698                                         in->win_ctime[0] = oh->win_ctime[0];
5699                                         in->win_mtime[0] = oh->win_mtime[0];
5700                                         in->win_atime[1] = oh->win_atime[1];
5701                                         in->win_ctime[1] = oh->win_ctime[1];
5702                                         in->win_mtime[1] = oh->win_mtime[1];
5703 #else
5704                                         in->yst_uid = oh->yst_uid;
5705                                         in->yst_gid = oh->yst_gid;
5706                                         in->yst_atime = oh->yst_atime;
5707                                         in->yst_mtime = oh->yst_mtime;
5708                                         in->yst_ctime = oh->yst_ctime;
5709                                         in->yst_rdev = oh->yst_rdev;
5710 #endif
5711                                         in->chunkId = chunk;
5712
5713                                         yaffs_SetObjectName(in, oh->name);
5714                                         in->dirty = 0;
5715
5716                                         /* directory stuff...
5717                                          * hook up to parent
5718                                          */
5719
5720                                         parent =
5721                                             yaffs_FindOrCreateObjectByNumber
5722                                             (dev, oh->parentObjectId,
5723                                              YAFFS_OBJECT_TYPE_DIRECTORY);
5724                                         if (parent->variantType ==
5725                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
5726                                                 /* Set up as a directory */
5727                                                 parent->variantType =
5728                                                     YAFFS_OBJECT_TYPE_DIRECTORY;
5729                                                 INIT_LIST_HEAD(&parent->variant.
5730                                                                directoryVariant.
5731                                                                children);
5732                                         } else if (parent->variantType !=
5733                                                    YAFFS_OBJECT_TYPE_DIRECTORY)
5734                                         {
5735                                                 /* Hoosterman, another problem....
5736                                                  * We're trying to use a non-directory as a directory
5737                                                  */
5738
5739                                                 T(YAFFS_TRACE_ERROR,
5740                                                   (TSTR
5741                                                    ("yaffs tragedy: attempting to use non-directory as"
5742                                                     " a directory in scan. Put in lost+found."
5743                                                     TENDSTR)));
5744                                                 parent = dev->lostNFoundDir;
5745                                         }
5746
5747                                         yaffs_AddObjectToDirectory(parent, in);
5748
5749                                         if (0 && (parent == dev->deletedDir ||
5750                                                   parent == dev->unlinkedDir)) {
5751                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
5752                                                 dev->nDeletedFiles++;
5753                                         }
5754                                         /* Note re hardlinks.
5755                                          * Since we might scan a hardlink before its equivalent object is scanned
5756                                          * we put them all in a list.
5757                                          * After scanning is complete, we should have all the objects, so we run through this
5758                                          * list and fix up all the chains.
5759                                          */
5760
5761                                         switch (in->variantType) {
5762                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
5763                                                 /* Todo got a problem */
5764                                                 break;
5765                                         case YAFFS_OBJECT_TYPE_FILE:
5766                                                 if (dev->isYaffs2
5767                                                     && oh->isShrink) {
5768                                                         /* Prune back the shrunken chunks */
5769                                                         yaffs_PruneResizedChunks
5770                                                             (in, oh->fileSize);
5771                                                         /* Mark the block as having a shrinkHeader */
5772                                                         bi->hasShrinkHeader = 1;
5773                                                 }
5774
5775                                                 if (dev->useHeaderFileSize)
5776
5777                                                         in->variant.fileVariant.
5778                                                             fileSize =
5779                                                             oh->fileSize;
5780
5781                                                 break;
5782                                         case YAFFS_OBJECT_TYPE_HARDLINK:
5783                                                 in->variant.hardLinkVariant.
5784                                                     equivalentObjectId =
5785                                                     oh->equivalentObjectId;
5786                                                 in->hardLinks.next =
5787                                                     (struct list_head *)
5788                                                     hardList;
5789                                                 hardList = in;
5790                                                 break;
5791                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
5792                                                 /* Do nothing */
5793                                                 break;
5794                                         case YAFFS_OBJECT_TYPE_SPECIAL:
5795                                                 /* Do nothing */
5796                                                 break;
5797                                         case YAFFS_OBJECT_TYPE_SYMLINK:
5798                                                 in->variant.symLinkVariant.alias =
5799                                                     yaffs_CloneString(oh->alias);
5800                                                 if(!in->variant.symLinkVariant.alias)
5801                                                         alloc_failed = 1;
5802                                                 break;
5803                                         }
5804
5805                                         if (parent == dev->deletedDir) {
5806                                                 yaffs_DestroyObject(in);
5807                                                 bi->hasShrinkHeader = 1;
5808                                         }
5809                                 }
5810                         }
5811                 }
5812
5813                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5814                         /* If we got this far while scanning, then the block is fully allocated.*/
5815                         state = YAFFS_BLOCK_STATE_FULL;
5816                 }
5817
5818                 bi->blockState = state;
5819
5820                 /* Now let's see if it was dirty */
5821                 if (bi->pagesInUse == 0 &&
5822                     !bi->hasShrinkHeader &&
5823                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5824                         yaffs_BlockBecameDirty(dev, blk);
5825                 }
5826
5827         }
5828
5829         if (blockIndex) {
5830                 YFREE(blockIndex);
5831         }
5832
5833
5834         /* Ok, we've done all the scanning.
5835          * Fix up the hard link chains.
5836          * We should now have scanned all the objects, now it's time to add these
5837          * hardlinks.
5838          */
5839
5840         yaffs_HardlinkFixup(dev,hardList);
5841
5842         /* Handle the unlinked files. Since they were left in an unlinked state we should
5843          * just delete them.
5844          */
5845         {
5846                 struct list_head *i;
5847                 struct list_head *n;
5848
5849                 yaffs_Object *l;
5850                 /* Soft delete all the unlinked files */
5851                 list_for_each_safe(i, n,
5852                                    &dev->unlinkedDir->variant.directoryVariant.
5853                                    children) {
5854                         if (i) {
5855                                 l = list_entry(i, yaffs_Object, siblings);
5856                                 yaffs_DestroyObject(l);
5857                         }
5858                 }
5859         }
5860
5861         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5862
5863         if(alloc_failed){
5864                 return YAFFS_FAIL;
5865         }
5866
5867         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5868
5869
5870         return YAFFS_OK;
5871 }
5872
5873 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5874 {
5875         __u8 *chunkData;
5876         yaffs_ObjectHeader *oh;
5877         yaffs_Device *dev = in->myDev;
5878         yaffs_ExtendedTags tags;
5879         int result;
5880         int alloc_failed = 0;
5881
5882         if(!in)
5883                 return;
5884
5885 #if 0
5886         T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
5887                 in->objectId,
5888                 in->lazyLoaded ? "not yet" : "already"));
5889 #endif
5890
5891         if(in->lazyLoaded){
5892                 in->lazyLoaded = 0;
5893                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5894
5895                 result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
5896                 oh = (yaffs_ObjectHeader *) chunkData;
5897
5898                 in->yst_mode = oh->yst_mode;
5899 #ifdef CONFIG_YAFFS_WINCE
5900                 in->win_atime[0] = oh->win_atime[0];
5901                 in->win_ctime[0] = oh->win_ctime[0];
5902                 in->win_mtime[0] = oh->win_mtime[0];
5903                 in->win_atime[1] = oh->win_atime[1];
5904                 in->win_ctime[1] = oh->win_ctime[1];
5905                 in->win_mtime[1] = oh->win_mtime[1];
5906 #else
5907                 in->yst_uid = oh->yst_uid;
5908                 in->yst_gid = oh->yst_gid;
5909                 in->yst_atime = oh->yst_atime;
5910                 in->yst_mtime = oh->yst_mtime;
5911                 in->yst_ctime = oh->yst_ctime;
5912                 in->yst_rdev = oh->yst_rdev;
5913
5914 #endif
5915                 yaffs_SetObjectName(in, oh->name);
5916
5917                 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
5918                          in->variant.symLinkVariant.alias =
5919                                                     yaffs_CloneString(oh->alias);
5920                         if(!in->variant.symLinkVariant.alias)
5921                                 alloc_failed = 1; /* Not returned to caller */
5922                 }
5923
5924                 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
5925         }
5926 }
5927
5928 static int yaffs_ScanBackwards(yaffs_Device * dev)
5929 {
5930         yaffs_ExtendedTags tags;
5931         int blk;
5932         int blockIterator;
5933         int startIterator;
5934         int endIterator;
5935         int nBlocksToScan = 0;
5936
5937         int chunk;
5938         int result;
5939         int c;
5940         int deleted;
5941         yaffs_BlockState state;
5942         yaffs_Object *hardList = NULL;
5943         yaffs_BlockInfo *bi;
5944         int sequenceNumber;
5945         yaffs_ObjectHeader *oh;
5946         yaffs_Object *in;
5947         yaffs_Object *parent;
5948         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5949         int itsUnlinked;
5950         __u8 *chunkData;
5951
5952         int fileSize;
5953         int isShrink;
5954         int foundChunksInBlock;
5955         int equivalentObjectId;
5956         int alloc_failed = 0;
5957
5958
5959         yaffs_BlockIndex *blockIndex = NULL;
5960         int altBlockIndex = 0;
5961
5962         if (!dev->isYaffs2) {
5963                 T(YAFFS_TRACE_SCAN,
5964                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5965                 return YAFFS_FAIL;
5966         }
5967
5968         T(YAFFS_TRACE_SCAN,
5969           (TSTR
5970            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
5971             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5972
5973
5974         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5975
5976         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5977
5978         if(!blockIndex) {
5979                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
5980                 altBlockIndex = 1;
5981         }
5982
5983         if(!blockIndex) {
5984                 T(YAFFS_TRACE_SCAN,
5985                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
5986                 return YAFFS_FAIL;
5987         }
5988
5989         dev->blocksInCheckpoint = 0;
5990
5991         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5992
5993         /* Scan all the blocks to determine their state */
5994         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5995                 bi = yaffs_GetBlockInfo(dev, blk);
5996                 yaffs_ClearChunkBits(dev, blk);
5997                 bi->pagesInUse = 0;
5998                 bi->softDeletions = 0;
5999
6000                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6001
6002                 bi->blockState = state;
6003                 bi->sequenceNumber = sequenceNumber;
6004
6005                 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6006                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6007
6008                 T(YAFFS_TRACE_SCAN_DEBUG,
6009                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6010                    state, sequenceNumber));
6011
6012
6013                 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
6014                         dev->blocksInCheckpoint++;
6015
6016                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6017                         T(YAFFS_TRACE_BAD_BLOCKS,
6018                           (TSTR("block %d is bad" TENDSTR), blk));
6019                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6020                         T(YAFFS_TRACE_SCAN_DEBUG,
6021                           (TSTR("Block empty " TENDSTR)));
6022                         dev->nErasedBlocks++;
6023                         dev->nFreeChunks += dev->nChunksPerBlock;
6024                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6025
6026                         /* Determine the highest sequence number */
6027                         if (dev->isYaffs2 &&
6028                             sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6029                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6030
6031                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
6032                                 blockIndex[nBlocksToScan].block = blk;
6033
6034                                 nBlocksToScan++;
6035
6036                                 if (sequenceNumber >= dev->sequenceNumber) {
6037                                         dev->sequenceNumber = sequenceNumber;
6038                                 }
6039                         } else if (dev->isYaffs2) {
6040                                 /* TODO: Nasty sequence number! */
6041                                 T(YAFFS_TRACE_SCAN,
6042                                   (TSTR
6043                                    ("Block scanning block %d has bad sequence number %d"
6044                                     TENDSTR), blk, sequenceNumber));
6045
6046                         }
6047                 }
6048         }
6049
6050         T(YAFFS_TRACE_SCAN,
6051         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6052
6053
6054
6055         YYIELD();
6056
6057         /* Sort the blocks */
6058 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6059         {
6060                 /* Use qsort now. */
6061                 qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6062         }
6063 #else
6064         {
6065                 /* Dungy old bubble sort... */
6066
6067                 yaffs_BlockIndex temp;
6068                 int i;
6069                 int j;
6070
6071                 for (i = 0; i < nBlocksToScan; i++)
6072                         for (j = i + 1; j < nBlocksToScan; j++)
6073                                 if (blockIndex[i].seq > blockIndex[j].seq) {
6074                                         temp = blockIndex[j];
6075                                         blockIndex[j] = blockIndex[i];
6076                                         blockIndex[i] = temp;
6077                                 }
6078         }
6079 #endif
6080
6081         YYIELD();
6082
6083         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6084
6085         /* Now scan the blocks looking at the data. */
6086         startIterator = 0;
6087         endIterator = nBlocksToScan - 1;
6088         T(YAFFS_TRACE_SCAN_DEBUG,
6089           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6090
6091         /* For each block.... backwards */
6092         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6093              blockIterator--) {
6094                 /* Cooperative multitasking! This loop can run for so
6095                    long that watchdog timers expire. */
6096                 YYIELD();
6097
6098                 /* get the block to scan in the correct order */
6099                 blk = blockIndex[blockIterator].block;
6100
6101                 bi = yaffs_GetBlockInfo(dev, blk);
6102
6103
6104                 state = bi->blockState;
6105
6106                 deleted = 0;
6107
6108                 /* For each chunk in each block that needs scanning.... */
6109                 foundChunksInBlock = 0;
6110                 for (c = dev->nChunksPerBlock - 1;
6111                      !alloc_failed && c >= 0 &&
6112                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6113                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6114                         /* Scan backwards...
6115                          * Read the tags and decide what to do
6116                          */
6117
6118                         chunk = blk * dev->nChunksPerBlock + c;
6119
6120                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6121                                                         &tags);
6122
6123                         /* Let's have a good look at this chunk... */
6124
6125                         if (!tags.chunkUsed) {
6126                                 /* An unassigned chunk in the block.
6127                                  * If there are used chunks after this one, then
6128                                  * it is a chunk that was skipped due to failing the erased
6129                                  * check. Just skip it so that it can be deleted.
6130                                  * But, more typically, We get here when this is an unallocated
6131                                  * chunk and his means that either the block is empty or
6132                                  * this is the one being allocated from
6133                                  */
6134
6135                                 if(foundChunksInBlock)
6136                                 {
6137                                         /* This is a chunk that was skipped due to failing the erased check */
6138
6139                                 } else if (c == 0) {
6140                                         /* We're looking at the first chunk in the block so the block is unused */
6141                                         state = YAFFS_BLOCK_STATE_EMPTY;
6142                                         dev->nErasedBlocks++;
6143                                 } else {
6144                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6145                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6146                                                 if(dev->sequenceNumber == bi->sequenceNumber) {
6147                                                         /* this is the block being allocated from */
6148
6149                                                         T(YAFFS_TRACE_SCAN,
6150                                                           (TSTR
6151                                                            (" Allocating from %d %d"
6152                                                             TENDSTR), blk, c));
6153
6154                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6155                                                         dev->allocationBlock = blk;
6156                                                         dev->allocationPage = c;
6157                                                         dev->allocationBlockFinder = blk;
6158                                                 }
6159                                                 else {
6160                                                         /* This is a partially written block that is not
6161                                                          * the current allocation block. This block must have
6162                                                          * had a write failure, so set up for retirement.
6163                                                          */
6164
6165                                                          bi->needsRetiring = 1;
6166                                                          bi->gcPrioritise = 1;
6167
6168                                                          T(YAFFS_TRACE_ALWAYS,
6169                                                          (TSTR("Partially written block %d being set for retirement" TENDSTR),
6170                                                          blk));
6171                                                 }
6172
6173                                         }
6174
6175                                 }
6176
6177                                 dev->nFreeChunks++;
6178
6179                         } else if (tags.chunkId > 0) {
6180                                 /* chunkId > 0 so it is a data chunk... */
6181                                 unsigned int endpos;
6182                                 __u32 chunkBase =
6183                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6184
6185                                 foundChunksInBlock = 1;
6186
6187
6188                                 yaffs_SetChunkBit(dev, blk, c);
6189                                 bi->pagesInUse++;
6190
6191                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6192                                                                       tags.
6193                                                                       objectId,
6194                                                                       YAFFS_OBJECT_TYPE_FILE);
6195                                 if(!in){
6196                                         /* Out of memory */
6197                                         alloc_failed = 1;
6198                                 }
6199
6200                                 if (in &&
6201                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6202                                     && chunkBase <
6203                                     in->variant.fileVariant.shrinkSize) {
6204                                         /* This has not been invalidated by a resize */
6205                                         if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
6206                                                                chunk, -1)){
6207                                                 alloc_failed = 1;
6208                                         }
6209
6210                                         /* File size is calculated by looking at the data chunks if we have not
6211                                          * seen an object header yet. Stop this practice once we find an object header.
6212                                          */
6213                                         endpos =
6214                                             (tags.chunkId -
6215                                              1) * dev->nDataBytesPerChunk +
6216                                             tags.byteCount;
6217
6218                                         if (!in->valid &&       /* have not got an object header yet */
6219                                             in->variant.fileVariant.
6220                                             scannedFileSize < endpos) {
6221                                                 in->variant.fileVariant.
6222                                                     scannedFileSize = endpos;
6223                                                 in->variant.fileVariant.
6224                                                     fileSize =
6225                                                     in->variant.fileVariant.
6226                                                     scannedFileSize;
6227                                         }
6228
6229                                 } else if(in) {
6230                                         /* This chunk has been invalidated by a resize, so delete */
6231                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6232
6233                                 }
6234                         } else {
6235                                 /* chunkId == 0, so it is an ObjectHeader.
6236                                  * Thus, we read in the object header and make the object
6237                                  */
6238                                 foundChunksInBlock = 1;
6239
6240                                 yaffs_SetChunkBit(dev, blk, c);
6241                                 bi->pagesInUse++;
6242
6243                                 oh = NULL;
6244                                 in = NULL;
6245
6246                                 if (tags.extraHeaderInfoAvailable) {
6247                                         in = yaffs_FindOrCreateObjectByNumber
6248                                             (dev, tags.objectId,
6249                                              tags.extraObjectType);
6250                                 }
6251
6252                                 if (!in ||
6253 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6254                                     !in->valid ||
6255 #endif
6256                                     tags.extraShadows ||
6257                                     (!in->valid &&
6258                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6259                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
6260                                     ) {
6261
6262                                         /* If we don't have  valid info then we need to read the chunk
6263                                          * TODO In future we can probably defer reading the chunk and
6264                                          * living with invalid data until needed.
6265                                          */
6266
6267                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6268                                                                         chunk,
6269                                                                         chunkData,
6270                                                                         NULL);
6271
6272                                         oh = (yaffs_ObjectHeader *) chunkData;
6273
6274                                         if (!in)
6275                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6276
6277                                 }
6278
6279                                 if (!in) {
6280                                         /* TODO Hoosterman we have a problem! */
6281                                         T(YAFFS_TRACE_ERROR,
6282                                           (TSTR
6283                                            ("yaffs tragedy: Could not make object for object  %d  "
6284                                             "at chunk %d during scan"
6285                                             TENDSTR), tags.objectId, chunk));
6286
6287                                 }
6288
6289                                 if (in->valid) {
6290                                         /* We have already filled this one.
6291                                          * We have a duplicate that will be discarded, but
6292                                          * we first have to suck out resize info if it is a file.
6293                                          */
6294
6295                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6296                                              ((oh &&
6297                                                oh-> type == YAFFS_OBJECT_TYPE_FILE)||
6298                                               (tags.extraHeaderInfoAvailable  &&
6299                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
6300                                             ) {
6301                                                 __u32 thisSize =
6302                                                     (oh) ? oh->fileSize : tags.
6303                                                     extraFileLength;
6304                                                 __u32 parentObjectId =
6305                                                     (oh) ? oh->
6306                                                     parentObjectId : tags.
6307                                                     extraParentObjectId;
6308                                                 unsigned isShrink =
6309                                                     (oh) ? oh->isShrink : tags.
6310                                                     extraIsShrinkHeader;
6311
6312                                                 /* If it is deleted (unlinked at start also means deleted)
6313                                                  * we treat the file size as being zeroed at this point.
6314                                                  */
6315                                                 if (parentObjectId ==
6316                                                     YAFFS_OBJECTID_DELETED
6317                                                     || parentObjectId ==
6318                                                     YAFFS_OBJECTID_UNLINKED) {
6319                                                         thisSize = 0;
6320                                                         isShrink = 1;
6321                                                 }
6322
6323                                                 if (isShrink &&
6324                                                     in->variant.fileVariant.
6325                                                     shrinkSize > thisSize) {
6326                                                         in->variant.fileVariant.
6327                                                             shrinkSize =
6328                                                             thisSize;
6329                                                 }
6330
6331                                                 if (isShrink) {
6332                                                         bi->hasShrinkHeader = 1;
6333                                                 }
6334
6335                                         }
6336                                         /* Use existing - destroy this one. */
6337                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6338
6339                                 }
6340
6341                                 if (!in->valid &&
6342                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6343                                      tags.objectId ==
6344                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6345                                         /* We only load some info, don't fiddle with directory structure */
6346                                         in->valid = 1;
6347
6348                                         if(oh) {
6349                                                 in->variantType = oh->type;
6350
6351                                                 in->yst_mode = oh->yst_mode;
6352 #ifdef CONFIG_YAFFS_WINCE
6353                                                 in->win_atime[0] = oh->win_atime[0];
6354                                                 in->win_ctime[0] = oh->win_ctime[0];
6355                                                 in->win_mtime[0] = oh->win_mtime[0];
6356                                                 in->win_atime[1] = oh->win_atime[1];
6357                                                 in->win_ctime[1] = oh->win_ctime[1];
6358                                                 in->win_mtime[1] = oh->win_mtime[1];
6359 #else
6360                                                 in->yst_uid = oh->yst_uid;
6361                                                 in->yst_gid = oh->yst_gid;
6362                                                 in->yst_atime = oh->yst_atime;
6363                                                 in->yst_mtime = oh->yst_mtime;
6364                                                 in->yst_ctime = oh->yst_ctime;
6365                                                 in->yst_rdev = oh->yst_rdev;
6366
6367 #endif
6368                                         } else {
6369                                                 in->variantType = tags.extraObjectType;
6370                                                 in->lazyLoaded = 1;
6371                                         }
6372
6373                                         in->chunkId = chunk;
6374
6375                                 } else if (!in->valid) {
6376                                         /* we need to load this info */
6377
6378                                         in->valid = 1;
6379                                         in->chunkId = chunk;
6380
6381                                         if(oh) {
6382                                                 in->variantType = oh->type;
6383
6384                                                 in->yst_mode = oh->yst_mode;
6385 #ifdef CONFIG_YAFFS_WINCE
6386                                                 in->win_atime[0] = oh->win_atime[0];
6387                                                 in->win_ctime[0] = oh->win_ctime[0];
6388                                                 in->win_mtime[0] = oh->win_mtime[0];
6389                                                 in->win_atime[1] = oh->win_atime[1];
6390                                                 in->win_ctime[1] = oh->win_ctime[1];
6391                                                 in->win_mtime[1] = oh->win_mtime[1];
6392 #else
6393                                                 in->yst_uid = oh->yst_uid;
6394                                                 in->yst_gid = oh->yst_gid;
6395                                                 in->yst_atime = oh->yst_atime;
6396                                                 in->yst_mtime = oh->yst_mtime;
6397                                                 in->yst_ctime = oh->yst_ctime;
6398                                                 in->yst_rdev = oh->yst_rdev;
6399 #endif
6400
6401                                                 if (oh->shadowsObject > 0)
6402                                                         yaffs_HandleShadowedObject(dev,
6403                                                                            oh->
6404                                                                            shadowsObject,
6405                                                                            1);
6406
6407
6408                                                 yaffs_SetObjectName(in, oh->name);
6409                                                 parent =
6410                                                     yaffs_FindOrCreateObjectByNumber
6411                                                         (dev, oh->parentObjectId,
6412                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6413
6414                                                  fileSize = oh->fileSize;
6415                                                  isShrink = oh->isShrink;
6416                                                  equivalentObjectId = oh->equivalentObjectId;
6417
6418                                         }
6419                                         else {
6420                                                 in->variantType = tags.extraObjectType;
6421                                                 parent =
6422                                                     yaffs_FindOrCreateObjectByNumber
6423                                                         (dev, tags.extraParentObjectId,
6424                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6425                                                  fileSize = tags.extraFileLength;
6426                                                  isShrink = tags.extraIsShrinkHeader;
6427                                                  equivalentObjectId = tags.extraEquivalentObjectId;
6428                                                 in->lazyLoaded = 1;
6429
6430                                         }
6431                                         in->dirty = 0;
6432
6433                                         /* directory stuff...
6434                                          * hook up to parent
6435                                          */
6436
6437                                         if (parent->variantType ==
6438                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6439                                                 /* Set up as a directory */
6440                                                 parent->variantType =
6441                                                     YAFFS_OBJECT_TYPE_DIRECTORY;
6442                                                 INIT_LIST_HEAD(&parent->variant.
6443                                                                directoryVariant.
6444                                                                children);
6445                                         } else if (parent->variantType !=
6446                                                    YAFFS_OBJECT_TYPE_DIRECTORY)
6447                                         {
6448                                                 /* Hoosterman, another problem....
6449                                                  * We're trying to use a non-directory as a directory
6450                                                  */
6451
6452                                                 T(YAFFS_TRACE_ERROR,
6453                                                   (TSTR
6454                                                    ("yaffs tragedy: attempting to use non-directory as"
6455                                                     " a directory in scan. Put in lost+found."
6456                                                     TENDSTR)));
6457                                                 parent = dev->lostNFoundDir;
6458                                         }
6459
6460                                         yaffs_AddObjectToDirectory(parent, in);
6461
6462                                         itsUnlinked = (parent == dev->deletedDir) ||
6463                                                       (parent == dev->unlinkedDir);
6464
6465                                         if (isShrink) {
6466                                                 /* Mark the block as having a shrinkHeader */
6467                                                 bi->hasShrinkHeader = 1;
6468                                         }
6469
6470                                         /* Note re hardlinks.
6471                                          * Since we might scan a hardlink before its equivalent object is scanned
6472                                          * we put them all in a list.
6473                                          * After scanning is complete, we should have all the objects, so we run
6474                                          * through this list and fix up all the chains.
6475                                          */
6476
6477                                         switch (in->variantType) {
6478                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6479                                                 /* Todo got a problem */
6480                                                 break;
6481                                         case YAFFS_OBJECT_TYPE_FILE:
6482
6483                                                 if (in->variant.fileVariant.
6484                                                     scannedFileSize < fileSize) {
6485                                                         /* This covers the case where the file size is greater
6486                                                          * than where the data is
6487                                                          * This will happen if the file is resized to be larger
6488                                                          * than its current data extents.
6489                                                          */
6490                                                         in->variant.fileVariant.fileSize = fileSize;
6491                                                         in->variant.fileVariant.scannedFileSize =
6492                                                             in->variant.fileVariant.fileSize;
6493                                                 }
6494
6495                                                 if (isShrink &&
6496                                                     in->variant.fileVariant.shrinkSize > fileSize) {
6497                                                         in->variant.fileVariant.shrinkSize = fileSize;
6498                                                 }
6499
6500                                                 break;
6501                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6502                                                 if(!itsUnlinked) {
6503                                                   in->variant.hardLinkVariant.equivalentObjectId =
6504                                                     equivalentObjectId;
6505                                                   in->hardLinks.next =
6506                                                     (struct list_head *) hardList;
6507                                                   hardList = in;
6508                                                 }
6509                                                 break;
6510                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6511                                                 /* Do nothing */
6512                                                 break;
6513                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6514                                                 /* Do nothing */
6515                                                 break;
6516                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6517                                                 if(oh){
6518                                                    in->variant.symLinkVariant.alias =
6519                                                     yaffs_CloneString(oh->
6520                                                                       alias);
6521                                                    if(!in->variant.symLinkVariant.alias)
6522                                                         alloc_failed = 1;
6523                                                 }
6524                                                 break;
6525                                         }
6526
6527                                 }
6528
6529                         }
6530
6531                 } /* End of scanning for each chunk */
6532
6533                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6534                         /* If we got this far while scanning, then the block is fully allocated. */
6535                         state = YAFFS_BLOCK_STATE_FULL;
6536                 }
6537
6538                 bi->blockState = state;
6539
6540                 /* Now let's see if it was dirty */
6541                 if (bi->pagesInUse == 0 &&
6542                     !bi->hasShrinkHeader &&
6543                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6544                         yaffs_BlockBecameDirty(dev, blk);
6545                 }
6546
6547         }
6548
6549         if (altBlockIndex)
6550                 YFREE_ALT(blockIndex);
6551         else
6552                 YFREE(blockIndex);
6553
6554         /* Ok, we've done all the scanning.
6555          * Fix up the hard link chains.
6556          * We should now have scanned all the objects, now it's time to add these
6557          * hardlinks.
6558          */
6559         yaffs_HardlinkFixup(dev,hardList);
6560
6561
6562         /*
6563         *  Sort out state of unlinked and deleted objects.
6564         */
6565         {
6566                 struct list_head *i;
6567                 struct list_head *n;
6568
6569                 yaffs_Object *l;
6570
6571                 /* Soft delete all the unlinked files */
6572                 list_for_each_safe(i, n,
6573                                    &dev->unlinkedDir->variant.directoryVariant.
6574                                    children) {
6575                         if (i) {
6576                                 l = list_entry(i, yaffs_Object, siblings);
6577                                 yaffs_DestroyObject(l);
6578                         }
6579                 }
6580
6581                 /* Soft delete all the deletedDir files */
6582                 list_for_each_safe(i, n,
6583                                    &dev->deletedDir->variant.directoryVariant.
6584                                    children) {
6585                         if (i) {
6586                                 l = list_entry(i, yaffs_Object, siblings);
6587                                 yaffs_DestroyObject(l);
6588
6589                         }
6590                 }
6591         }
6592
6593         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6594
6595         if(alloc_failed){
6596                 return YAFFS_FAIL;
6597         }
6598
6599         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6600
6601         return YAFFS_OK;
6602 }
6603
6604 /*------------------------------  Directory Functions ----------------------------- */
6605
6606 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
6607 {
6608         yaffs_Device *dev = obj->myDev;
6609
6610         if(dev && dev->removeObjectCallback)
6611                 dev->removeObjectCallback(obj);
6612
6613         list_del_init(&obj->siblings);
6614         obj->parent = NULL;
6615 }
6616
6617
6618 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
6619                                        yaffs_Object * obj)
6620 {
6621
6622         if (!directory) {
6623                 T(YAFFS_TRACE_ALWAYS,
6624                   (TSTR
6625                    ("tragedy: Trying to add an object to a null pointer directory"
6626                     TENDSTR)));
6627                 YBUG();
6628         }
6629         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6630                 T(YAFFS_TRACE_ALWAYS,
6631                   (TSTR
6632                    ("tragedy: Trying to add an object to a non-directory"
6633                     TENDSTR)));
6634                 YBUG();
6635         }
6636
6637         if (obj->siblings.prev == NULL) {
6638                 /* Not initialised */
6639                 INIT_LIST_HEAD(&obj->siblings);
6640
6641         } else if (!list_empty(&obj->siblings)) {
6642                 /* If it is holed up somewhere else, un hook it */
6643                 yaffs_RemoveObjectFromDirectory(obj);
6644         }
6645         /* Now add it */
6646         list_add(&obj->siblings, &directory->variant.directoryVariant.children);
6647         obj->parent = directory;
6648
6649         if (directory == obj->myDev->unlinkedDir
6650             || directory == obj->myDev->deletedDir) {
6651                 obj->unlinked = 1;
6652                 obj->myDev->nUnlinkedFiles++;
6653                 obj->renameAllowed = 0;
6654         }
6655 }
6656
6657 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
6658                                      const YCHAR * name)
6659 {
6660         int sum;
6661
6662         struct list_head *i;
6663         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6664
6665         yaffs_Object *l;
6666
6667         if (!name) {
6668                 return NULL;
6669         }
6670
6671         if (!directory) {
6672                 T(YAFFS_TRACE_ALWAYS,
6673                   (TSTR
6674                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6675                     TENDSTR)));
6676                 YBUG();
6677         }
6678         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6679                 T(YAFFS_TRACE_ALWAYS,
6680                   (TSTR
6681                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6682                 YBUG();
6683         }
6684
6685         sum = yaffs_CalcNameSum(name);
6686
6687         list_for_each(i, &directory->variant.directoryVariant.children) {
6688                 if (i) {
6689                         l = list_entry(i, yaffs_Object, siblings);
6690
6691                         yaffs_CheckObjectDetailsLoaded(l);
6692
6693                         /* Special case for lost-n-found */
6694                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6695                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
6696                                         return l;
6697                                 }
6698                         } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
6699                         {
6700                                 /* LostnFound cunk called Objxxx
6701                                  * Do a real check
6702                                  */
6703                                 yaffs_GetObjectName(l, buffer,
6704                                                     YAFFS_MAX_NAME_LENGTH);
6705                                 if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
6706                                         return l;
6707                                 }
6708
6709                         }
6710                 }
6711         }
6712
6713         return NULL;
6714 }
6715
6716
6717 #if 0
6718 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
6719                                    int (*fn) (yaffs_Object *))
6720 {
6721         struct list_head *i;
6722         yaffs_Object *l;
6723
6724         if (!theDir) {
6725                 T(YAFFS_TRACE_ALWAYS,
6726                   (TSTR
6727                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6728                     TENDSTR)));
6729                 YBUG();
6730         }
6731         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6732                 T(YAFFS_TRACE_ALWAYS,
6733                   (TSTR
6734                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6735                 YBUG();
6736         }
6737
6738         list_for_each(i, &theDir->variant.directoryVariant.children) {
6739                 if (i) {
6740                         l = list_entry(i, yaffs_Object, siblings);
6741                         if (l && !fn(l)) {
6742                                 return YAFFS_FAIL;
6743                         }
6744                 }
6745         }
6746
6747         return YAFFS_OK;
6748
6749 }
6750 #endif
6751
6752 /* GetEquivalentObject dereferences any hard links to get to the
6753  * actual object.
6754  */
6755
6756 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
6757 {
6758         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6759                 /* We want the object id of the equivalent object, not this one */
6760                 obj = obj->variant.hardLinkVariant.equivalentObject;
6761                 yaffs_CheckObjectDetailsLoaded(obj);
6762         }
6763         return obj;
6764
6765 }
6766
6767 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
6768 {
6769         memset(name, 0, buffSize * sizeof(YCHAR));
6770
6771         yaffs_CheckObjectDetailsLoaded(obj);
6772
6773         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6774                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6775         } else if (obj->chunkId <= 0) {
6776                 YCHAR locName[20];
6777                 /* make up a name */
6778                 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
6779                               obj->objectId);
6780                 yaffs_strncpy(name, locName, buffSize - 1);
6781
6782         }
6783 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6784         else if (obj->shortName[0]) {
6785                 yaffs_strcpy(name, obj->shortName);
6786         }
6787 #endif
6788         else {
6789                 int result;
6790                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6791
6792                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6793
6794                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6795
6796                 if (obj->chunkId >= 0) {
6797                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6798                                                         obj->chunkId, buffer,
6799                                                         NULL);
6800                 }
6801                 yaffs_strncpy(name, oh->name, buffSize - 1);
6802
6803                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6804         }
6805
6806         return yaffs_strlen(name);
6807 }
6808
6809 int yaffs_GetObjectFileLength(yaffs_Object * obj)
6810 {
6811
6812         /* Dereference any hard linking */
6813         obj = yaffs_GetEquivalentObject(obj);
6814
6815         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
6816                 return obj->variant.fileVariant.fileSize;
6817         }
6818         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6819                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6820         } else {
6821                 /* Only a directory should drop through to here */
6822                 return obj->myDev->nDataBytesPerChunk;
6823         }
6824 }
6825
6826 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
6827 {
6828         int count = 0;
6829         struct list_head *i;
6830
6831         if (!obj->unlinked) {
6832                 count++;        /* the object itself */
6833         }
6834         list_for_each(i, &obj->hardLinks) {
6835                 count++;        /* add the hard links; */
6836         }
6837         return count;
6838
6839 }
6840
6841 int yaffs_GetObjectInode(yaffs_Object * obj)
6842 {
6843         obj = yaffs_GetEquivalentObject(obj);
6844
6845         return obj->objectId;
6846 }
6847
6848 unsigned yaffs_GetObjectType(yaffs_Object * obj)
6849 {
6850         obj = yaffs_GetEquivalentObject(obj);
6851
6852         switch (obj->variantType) {
6853         case YAFFS_OBJECT_TYPE_FILE:
6854                 return DT_REG;
6855                 break;
6856         case YAFFS_OBJECT_TYPE_DIRECTORY:
6857                 return DT_DIR;
6858                 break;
6859         case YAFFS_OBJECT_TYPE_SYMLINK:
6860                 return DT_LNK;
6861                 break;
6862         case YAFFS_OBJECT_TYPE_HARDLINK:
6863                 return DT_REG;
6864                 break;
6865         case YAFFS_OBJECT_TYPE_SPECIAL:
6866                 if (S_ISFIFO(obj->yst_mode))
6867                         return DT_FIFO;
6868                 if (S_ISCHR(obj->yst_mode))
6869                         return DT_CHR;
6870                 if (S_ISBLK(obj->yst_mode))
6871                         return DT_BLK;
6872                 if (S_ISSOCK(obj->yst_mode))
6873                         return DT_SOCK;
6874         default:
6875                 return DT_REG;
6876                 break;
6877         }
6878 }
6879
6880 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
6881 {
6882         obj = yaffs_GetEquivalentObject(obj);
6883         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6884                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
6885         } else {
6886                 return yaffs_CloneString(_Y(""));
6887         }
6888 }
6889
6890 #ifndef CONFIG_YAFFS_WINCE
6891
6892 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
6893 {
6894         unsigned int valid = attr->ia_valid;
6895
6896         if (valid & ATTR_MODE)
6897                 obj->yst_mode = attr->ia_mode;
6898         if (valid & ATTR_UID)
6899                 obj->yst_uid = attr->ia_uid;
6900         if (valid & ATTR_GID)
6901                 obj->yst_gid = attr->ia_gid;
6902
6903         if (valid & ATTR_ATIME)
6904                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
6905         if (valid & ATTR_CTIME)
6906                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
6907         if (valid & ATTR_MTIME)
6908                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
6909
6910         if (valid & ATTR_SIZE)
6911                 yaffs_ResizeFile(obj, attr->ia_size);
6912
6913         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6914
6915         return YAFFS_OK;
6916
6917 }
6918 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
6919 {
6920         unsigned int valid = 0;
6921
6922         attr->ia_mode = obj->yst_mode;
6923         valid |= ATTR_MODE;
6924         attr->ia_uid = obj->yst_uid;
6925         valid |= ATTR_UID;
6926         attr->ia_gid = obj->yst_gid;
6927         valid |= ATTR_GID;
6928
6929         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
6930         valid |= ATTR_ATIME;
6931         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
6932         valid |= ATTR_CTIME;
6933         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
6934         valid |= ATTR_MTIME;
6935
6936         attr->ia_size = yaffs_GetFileSize(obj);
6937         valid |= ATTR_SIZE;
6938
6939         attr->ia_valid = valid;
6940
6941         return YAFFS_OK;
6942
6943 }
6944
6945 #endif
6946
6947 #if 0
6948 int yaffs_DumpObject(yaffs_Object * obj)
6949 {
6950         YCHAR name[257];
6951
6952         yaffs_GetObjectName(obj, name, 256);
6953
6954         T(YAFFS_TRACE_ALWAYS,
6955           (TSTR
6956            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
6957             " chunk %d type %d size %d\n"
6958             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
6959            obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
6960            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
6961
6962         return YAFFS_OK;
6963 }
6964 #endif
6965
6966 /*---------------------------- Initialisation code -------------------------------------- */
6967
6968 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
6969 {
6970
6971         /* Common functions, gotta have */
6972         if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
6973                 return 0;
6974
6975 #ifdef CONFIG_YAFFS_YAFFS2
6976
6977         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
6978         if (dev->writeChunkWithTagsToNAND &&
6979             dev->readChunkWithTagsFromNAND &&
6980             !dev->writeChunkToNAND &&
6981             !dev->readChunkFromNAND &&
6982             dev->markNANDBlockBad && dev->queryNANDBlock)
6983                 return 1;
6984 #endif
6985
6986         /* Can use the "spare" style interface for yaffs1 */
6987         if (!dev->isYaffs2 &&
6988             !dev->writeChunkWithTagsToNAND &&
6989             !dev->readChunkWithTagsFromNAND &&
6990             dev->writeChunkToNAND &&
6991             dev->readChunkFromNAND &&
6992             !dev->markNANDBlockBad && !dev->queryNANDBlock)
6993                 return 1;
6994
6995         return 0;               /* bad */
6996 }
6997
6998
6999 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7000 {
7001         /* Initialise the unlinked, deleted, root and lost and found directories */
7002
7003         dev->lostNFoundDir = dev->rootDir =  NULL;
7004         dev->unlinkedDir = dev->deletedDir = NULL;
7005
7006         dev->unlinkedDir =
7007             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7008
7009         dev->deletedDir =
7010             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7011
7012         dev->rootDir =
7013             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7014                                       YAFFS_ROOT_MODE | S_IFDIR);
7015         dev->lostNFoundDir =
7016             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7017                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7018
7019         if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
7020                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7021                 return YAFFS_OK;
7022         }
7023
7024         return YAFFS_FAIL;
7025 }
7026
7027 int yaffs_GutsInitialise(yaffs_Device * dev)
7028 {
7029         int init_failed = 0;
7030         unsigned x;
7031         int bits;
7032
7033         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7034
7035         /* Check stuff that must be set */
7036
7037         if (!dev) {
7038                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7039                 return YAFFS_FAIL;
7040         }
7041
7042         dev->internalStartBlock = dev->startBlock;
7043         dev->internalEndBlock = dev->endBlock;
7044         dev->blockOffset = 0;
7045         dev->chunkOffset = 0;
7046         dev->nFreeChunks = 0;
7047
7048         if (dev->startBlock == 0) {
7049                 dev->internalStartBlock = dev->startBlock + 1;
7050                 dev->internalEndBlock = dev->endBlock + 1;
7051                 dev->blockOffset = 1;
7052                 dev->chunkOffset = dev->nChunksPerBlock;
7053         }
7054
7055         /* Check geometry parameters. */
7056
7057         if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
7058             (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
7059              dev->nChunksPerBlock < 2 ||
7060              dev->nReservedBlocks < 2 ||
7061              dev->internalStartBlock <= 0 ||
7062              dev->internalEndBlock <= 0 ||
7063              dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)      // otherwise it is too small
7064             ) {
7065                 T(YAFFS_TRACE_ALWAYS,
7066                   (TSTR
7067                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
7068                     TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
7069                 return YAFFS_FAIL;
7070         }
7071
7072         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7073                 T(YAFFS_TRACE_ALWAYS,
7074                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7075                 return YAFFS_FAIL;
7076         }
7077
7078         /* Got the right mix of functions? */
7079         if (!yaffs_CheckDevFunctions(dev)) {
7080                 /* Function missing */
7081                 T(YAFFS_TRACE_ALWAYS,
7082                   (TSTR
7083                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7084
7085                 return YAFFS_FAIL;
7086         }
7087
7088         /* This is really a compilation check. */
7089         if (!yaffs_CheckStructures()) {
7090                 T(YAFFS_TRACE_ALWAYS,
7091                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7092                 return YAFFS_FAIL;
7093         }
7094
7095         if (dev->isMounted) {
7096                 T(YAFFS_TRACE_ALWAYS,
7097                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
7098                 return YAFFS_FAIL;
7099         }
7100
7101         /* Finished with most checks. One or two more checks happen later on too. */
7102
7103         dev->isMounted = 1;
7104
7105
7106
7107         /* OK now calculate a few things for the device */
7108
7109         /*
7110          *  Calculate all the chunk size manipulation numbers:
7111          */
7112          /* Start off assuming it is a power of 2 */
7113          dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
7114          dev->chunkMask = (1<<dev->chunkShift) - 1;
7115
7116          if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
7117                 /* Yes it is a power of 2, disable crumbs */
7118                 dev->crumbMask = 0;
7119                 dev->crumbShift = 0;
7120                 dev->crumbsPerChunk = 0;
7121          } else {
7122                 /* Not a power of 2, use crumbs instead */
7123                 dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
7124                 dev->crumbMask = (1<<dev->crumbShift)-1;
7125                 dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
7126                 dev->chunkShift = 0;
7127                 dev->chunkMask = 0;
7128         }
7129
7130
7131         /*
7132          * Calculate chunkGroupBits.
7133          * We need to find the next power of 2 > than internalEndBlock
7134          */
7135
7136         x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7137
7138         bits = ShiftsGE(x);
7139
7140         /* Set up tnode width if wide tnodes are enabled. */
7141         if(!dev->wideTnodesDisabled){
7142                 /* bits must be even so that we end up with 32-bit words */
7143                 if(bits & 1)
7144                         bits++;
7145                 if(bits < 16)
7146                         dev->tnodeWidth = 16;
7147                 else
7148                         dev->tnodeWidth = bits;
7149         }
7150         else
7151                 dev->tnodeWidth = 16;
7152
7153         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7154
7155         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7156          * so if the bitwidth of the
7157          * chunk range we're using is greater than 16 we need
7158          * to figure out chunk shift and chunkGroupSize
7159          */
7160
7161         if (bits <= dev->tnodeWidth)
7162                 dev->chunkGroupBits = 0;
7163         else
7164                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7165
7166
7167         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7168
7169         if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7170                 /* We have a problem because the soft delete won't work if
7171                  * the chunk group size > chunks per block.
7172                  * This can be remedied by using larger "virtual blocks".
7173                  */
7174                 T(YAFFS_TRACE_ALWAYS,
7175                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7176
7177                 return YAFFS_FAIL;
7178         }
7179
7180         /* OK, we've finished verifying the device, lets continue with initialisation */
7181
7182         /* More device initialisation */
7183         dev->garbageCollections = 0;
7184         dev->passiveGarbageCollections = 0;
7185         dev->currentDirtyChecker = 0;
7186         dev->bufferedBlock = -1;
7187         dev->doingBufferedBlockRewrite = 0;
7188         dev->nDeletedFiles = 0;
7189         dev->nBackgroundDeletions = 0;
7190         dev->nUnlinkedFiles = 0;
7191         dev->eccFixed = 0;
7192         dev->eccUnfixed = 0;
7193         dev->tagsEccFixed = 0;
7194         dev->tagsEccUnfixed = 0;
7195         dev->nErasureFailures = 0;
7196         dev->nErasedBlocks = 0;
7197         dev->isDoingGC = 0;
7198         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7199
7200         /* Initialise temporary buffers and caches. */
7201         if(!yaffs_InitialiseTempBuffers(dev))
7202                 init_failed = 1;
7203
7204         dev->srCache = NULL;
7205         dev->gcCleanupList = NULL;
7206
7207
7208         if (!init_failed &&
7209             dev->nShortOpCaches > 0) {
7210                 int i;
7211                 __u8 *buf;
7212                 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7213
7214                 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
7215                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7216                 }
7217
7218                 buf = dev->srCache =  YMALLOC(srCacheBytes);
7219
7220                 if(dev->srCache)
7221                         memset(dev->srCache,0,srCacheBytes);
7222
7223                 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7224                         dev->srCache[i].object = NULL;
7225                         dev->srCache[i].lastUse = 0;
7226                         dev->srCache[i].dirty = 0;
7227                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
7228                 }
7229                 if(!buf)
7230                         init_failed = 1;
7231
7232                 dev->srLastUse = 0;
7233         }
7234
7235         dev->cacheHits = 0;
7236
7237         if(!init_failed){
7238                 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7239                 if(!dev->gcCleanupList)
7240                         init_failed = 1;
7241         }
7242
7243         if (dev->isYaffs2) {
7244                 dev->useHeaderFileSize = 1;
7245         }
7246         if(!init_failed && !yaffs_InitialiseBlocks(dev))
7247                 init_failed = 1;
7248
7249         yaffs_InitialiseTnodes(dev);
7250         yaffs_InitialiseObjects(dev);
7251
7252         if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7253                 init_failed = 1;
7254
7255
7256         if(!init_failed){
7257                 /* Now scan the flash. */
7258                 if (dev->isYaffs2) {
7259                         if(yaffs_CheckpointRestore(dev)) {
7260                                 T(YAFFS_TRACE_ALWAYS,
7261                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7262                         } else {
7263
7264                                 /* Clean up the mess caused by an aborted checkpoint load
7265                                  * and scan backwards.
7266                                  */
7267                                 yaffs_DeinitialiseBlocks(dev);
7268                                 yaffs_DeinitialiseTnodes(dev);
7269                                 yaffs_DeinitialiseObjects(dev);
7270
7271
7272                                 dev->nErasedBlocks = 0;
7273                                 dev->nFreeChunks = 0;
7274                                 dev->allocationBlock = -1;
7275                                 dev->allocationPage = -1;
7276                                 dev->nDeletedFiles = 0;
7277                                 dev->nUnlinkedFiles = 0;
7278                                 dev->nBackgroundDeletions = 0;
7279                                 dev->oldestDirtySequence = 0;
7280
7281                                 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7282                                         init_failed = 1;
7283
7284                                 yaffs_InitialiseTnodes(dev);
7285                                 yaffs_InitialiseObjects(dev);
7286
7287                                 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7288                                         init_failed = 1;
7289
7290                                 if(!init_failed && !yaffs_ScanBackwards(dev))
7291                                         init_failed = 1;
7292                         }
7293                 }else
7294                         if(!yaffs_Scan(dev))
7295                                 init_failed = 1;
7296         }
7297
7298         if(init_failed){
7299                 /* Clean up the mess */
7300                 T(YAFFS_TRACE_TRACING,
7301                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7302
7303                 yaffs_Deinitialise(dev);
7304                 return YAFFS_FAIL;
7305         }
7306
7307         /* Zero out stats */
7308         dev->nPageReads = 0;
7309         dev->nPageWrites = 0;
7310         dev->nBlockErasures = 0;
7311         dev->nGCCopies = 0;
7312         dev->nRetriedWrites = 0;
7313
7314         dev->nRetiredBlocks = 0;
7315
7316         yaffs_VerifyFreeChunks(dev);
7317         yaffs_VerifyBlocks(dev);
7318
7319
7320         T(YAFFS_TRACE_TRACING,
7321           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7322         return YAFFS_OK;
7323
7324 }
7325
7326 void yaffs_Deinitialise(yaffs_Device * dev)
7327 {
7328         if (dev->isMounted) {
7329                 int i;
7330
7331                 yaffs_DeinitialiseBlocks(dev);
7332                 yaffs_DeinitialiseTnodes(dev);
7333                 yaffs_DeinitialiseObjects(dev);
7334                 if (dev->nShortOpCaches > 0 &&
7335                     dev->srCache) {
7336
7337                         for (i = 0; i < dev->nShortOpCaches; i++) {
7338                                 if(dev->srCache[i].data)
7339                                         YFREE(dev->srCache[i].data);
7340                                 dev->srCache[i].data = NULL;
7341                         }
7342
7343                         YFREE(dev->srCache);
7344                         dev->srCache = NULL;
7345                 }
7346
7347                 YFREE(dev->gcCleanupList);
7348
7349                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
7350                         YFREE(dev->tempBuffer[i].buffer);
7351                 }
7352
7353                 dev->isMounted = 0;
7354         }
7355
7356 }
7357
7358 static int yaffs_CountFreeChunks(yaffs_Device * dev)
7359 {
7360         int nFree;
7361         int b;
7362
7363         yaffs_BlockInfo *blk;
7364
7365         for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7366              b++) {
7367                 blk = yaffs_GetBlockInfo(dev, b);
7368
7369                 switch (blk->blockState) {
7370                 case YAFFS_BLOCK_STATE_EMPTY:
7371                 case YAFFS_BLOCK_STATE_ALLOCATING:
7372                 case YAFFS_BLOCK_STATE_COLLECTING:
7373                 case YAFFS_BLOCK_STATE_FULL:
7374                         nFree +=
7375                             (dev->nChunksPerBlock - blk->pagesInUse +
7376                              blk->softDeletions);
7377                         break;
7378                 default:
7379                         break;
7380                 }
7381
7382         }
7383
7384         return nFree;
7385 }
7386
7387 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
7388 {
7389         /* This is what we report to the outside world */
7390
7391         int nFree;
7392         int nDirtyCacheChunks;
7393         int blocksForCheckpoint;
7394
7395 #if 1
7396         nFree = dev->nFreeChunks;
7397 #else
7398         nFree = yaffs_CountFreeChunks(dev);
7399 #endif
7400
7401         nFree += dev->nDeletedFiles;
7402
7403         /* Now count the number of dirty chunks in the cache and subtract those */
7404
7405         {
7406                 int i;
7407                 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7408                         if (dev->srCache[i].dirty)
7409                                 nDirtyCacheChunks++;
7410                 }
7411         }
7412
7413         nFree -= nDirtyCacheChunks;
7414
7415         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7416
7417         /* Now we figure out how much to reserve for the checkpoint and report that... */
7418         blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
7419         if(blocksForCheckpoint < 0)
7420                 blocksForCheckpoint = 0;
7421
7422         nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7423
7424         if (nFree < 0)
7425                 nFree = 0;
7426
7427         return nFree;
7428
7429 }
7430
7431 static int yaffs_freeVerificationFailures;
7432
7433 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
7434 {
7435         int counted;
7436         int difference;
7437
7438         if(yaffs_SkipVerification(dev))
7439                 return;
7440
7441         counted = yaffs_CountFreeChunks(dev);
7442
7443         difference = dev->nFreeChunks - counted;
7444
7445         if (difference) {
7446                 T(YAFFS_TRACE_ALWAYS,
7447                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7448                    dev->nFreeChunks, counted, difference));
7449                 yaffs_freeVerificationFailures++;
7450         }
7451 }
7452
7453 /*---------------------------------------- YAFFS test code ----------------------*/
7454
7455 #define yaffs_CheckStruct(structure,syze, name) \
7456            if(sizeof(structure) != syze) \
7457                { \
7458                  T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
7459                  name,syze,sizeof(structure))); \
7460                  return YAFFS_FAIL; \
7461                 }
7462
7463 static int yaffs_CheckStructures(void)
7464 {
7465 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
7466 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
7467 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
7468 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7469         yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
7470 #endif
7471             yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
7472
7473             return YAFFS_OK;
7474 }