yaffs_guts.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002 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
  15 const char *yaffs_guts_c_version =
  16     "$Id: yaffs_guts.c,v 1.37 2006-09-21 08:13:59 charles Exp $";
  17
  18 #include "yportenv.h"
  19
  20 #include "yaffsinterface.h"
  21 #include "yaffs_guts.h"
  22 #include "yaffs_tagsvalidity.h"
  23
  24 #include "yaffs_tagscompat.h"
  25 #ifndef CONFIG_YAFFS_OWN_SORT
  26 #include "yaffs_qsort.h"
  27 #endif
  28 #include "yaffs_nand.h"
  29
  30 #include "yaffs_checkptrw.h"
  31
  32 #include "yaffs_nand.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 #ifdef YAFFS_PARANOID
 101 static int yaffs_CheckFileSanity(yaffs_Object * in);
 102 #else
 103 #define yaffs_CheckFileSanity(in)
 104 #endif
 105
 106 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
 107 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
 108
 109 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
 110
 111 /*
 112  * Temporary buffer manipulations.
 113  */
 114
 115 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
 116 {
 117         int i, j;
 118         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 119                 if (dev->tempBuffer[i].line == 0) {
 120                         dev->tempBuffer[i].line = lineNo;
 121                         if ((i + 1) > dev->maxTemp) {
 122                                 dev->maxTemp = i + 1;
 123                                 for (j = 0; j <= i; j++)
 124                                         dev->tempBuffer[j].maxLine =
 125                                             dev->tempBuffer[j].line;
 126                         }
 127
 128                         return dev->tempBuffer[i].buffer;
 129                 }
 130         }
 131
 132         T(YAFFS_TRACE_BUFFERS,
 133           (TSTR("Out of temp buffers at line %d, other held by lines:"),
 134            lineNo));
 135         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 136                 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
 137         }
 138         T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 139
 140         /*
 141          * If we got here then we have to allocate an unmanaged one
 142          * This is not good.
 143          */
 144
 145         dev->unmanagedTempAllocations++;
 146         return YMALLOC(dev->nBytesPerChunk);
 147
 148 }
 149
 150 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
 151                                     int lineNo)
 152 {
 153         int i;
 154         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 155                 if (dev->tempBuffer[i].buffer == buffer) {
 156                         dev->tempBuffer[i].line = 0;
 157                         return;
 158                 }
 159         }
 160
 161         if (buffer) {
 162                 /* assume it is an unmanaged one. */
 163                 T(YAFFS_TRACE_BUFFERS,
 164                   (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
 165                    lineNo));
 166                 YFREE(buffer);
 167                 dev->unmanagedTempDeallocations++;
 168         }
 169
 170 }
 171
 172 /*
 173  * Determine if we have a managed buffer.
 174  */
 175 int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
 176 {
 177         int i;
 178         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 179                 if (dev->tempBuffer[i].buffer == buffer)
 180                         return 1;
 181
 182         }
 183
 184     for (i = 0; i < dev->nShortOpCaches; i++) {
 185         if( dev->srCache[i].data == buffer )
 186             return 1;
 187
 188     }
 189
 190     if (buffer == dev->checkpointBuffer)
 191       return 1;
 192
 193     T(YAFFS_TRACE_ALWAYS,
 194           (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
 195     return 0;
 196 }
 197
 198 /*
 199  * Chunk bitmap manipulations
 200  */
 201
 202 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
 203 {
 204         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
 205                 T(YAFFS_TRACE_ERROR,
 206                   (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
 207                    blk));
 208                 YBUG();
 209         }
 210         return dev->chunkBits +
 211             (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 212 }
 213
 214 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
 215 {
 216         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 217
 218         memset(blkBits, 0, dev->chunkBitmapStride);
 219 }
 220
 221 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
 222 {
 223         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 224
 225         blkBits[chunk / 8] &= ~(1 << (chunk & 7));
 226 }
 227
 228 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
 229 {
 230         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 231
 232         blkBits[chunk / 8] |= (1 << (chunk & 7));
 233 }
 234
 235 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
 236 {
 237         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 238         return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
 239 }
 240
 241 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
 242 {
 243         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 244         int i;
 245         for (i = 0; i < dev->chunkBitmapStride; i++) {
 246                 if (*blkBits)
 247                         return 1;
 248                 blkBits++;
 249         }
 250         return 0;
 251 }
 252
 253 /*
 254  *  Simple hash function. Needs to have a reasonable spread
 255  */
 256
 257 static Y_INLINE int yaffs_HashFunction(int n)
 258 {
 259         n = abs(n);
 260         return (n % YAFFS_NOBJECT_BUCKETS);
 261 }
 262
 263 /*
 264  * Access functions to useful fake objects
 265  */
 266
 267 yaffs_Object *yaffs_Root(yaffs_Device * dev)
 268 {
 269         return dev->rootDir;
 270 }
 271
 272 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
 273 {
 274         return dev->lostNFoundDir;
 275 }
 276
 277
 278 /*
 279  *  Erased NAND checking functions
 280  */
 281
 282 int yaffs_CheckFF(__u8 * buffer, int nBytes)
 283 {
 284         /* Horrible, slow implementation */
 285         while (nBytes--) {
 286                 if (*buffer != 0xFF)
 287                         return 0;
 288                 buffer++;
 289         }
 290         return 1;
 291 }
 292
 293 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 294                                   int chunkInNAND)
 295 {
 296
 297         int retval = YAFFS_OK;
 298         __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
 299         yaffs_ExtendedTags tags;
 300
 301         yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 302
 303         if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
 304                 retval = YAFFS_FAIL;
 305
 306
 307         if (!yaffs_CheckFF(data, dev->nBytesPerChunk) || tags.chunkUsed) {
 308                 T(YAFFS_TRACE_NANDACCESS,
 309                   (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
 310                 retval = YAFFS_FAIL;
 311         }
 312
 313         yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 314
 315         return retval;
 316
 317 }
 318
 319 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 320                                              const __u8 * data,
 321                                              yaffs_ExtendedTags * tags,
 322                                              int useReserve)
 323 {
 324         int chunk;
 325
 326         int writeOk = 0;
 327         int erasedOk = 1;
 328         int attempts = 0;
 329         yaffs_BlockInfo *bi;
 330
 331         yaffs_InvalidateCheckpoint(dev);
 332
 333         do {
 334                 chunk = yaffs_AllocateChunk(dev, useReserve,&bi);
 335
 336                 if (chunk >= 0) {
 337                         /* First check this chunk is erased, if it needs checking.
 338                          * The checking policy (unless forced always on) is as follows:
 339                          * Check the first page we try to write in a block.
 340                          * - If the check passes then we don't need to check any more.
 341                          * - If the check fails, we check again...
 342                          * If the block has been erased, we don't need to check.
 343                          *
 344                          * However, if the block has been prioritised for gc, then
 345                          * we think there might be something odd about this block
 346                          * and should continue doing erased checks.
 347                          *
 348                          * Rationale:
 349                          * We should only ever see chunks that have not been erased
 350                          * if there was a partially written chunk due to power loss
 351                          * This checking policy should catch that case with very
 352                          * few checks and thus save a lot of checks that are most likely not
 353                          * needed.
 354                          */
 355
 356 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
 357                         bi->skipErasedCheck = 1;
 358 #endif
 359                         if(!bi->skipErasedCheck){
 360                                 erasedOk = yaffs_CheckChunkErased(dev, chunk);
 361                                 if(erasedOk && !bi->gcPrioritise)
 362                                         bi->skipErasedCheck = 1;
 363                         }
 364
 365                         if (!erasedOk) {
 366                                 T(YAFFS_TRACE_ERROR,
 367                                   (TSTR
 368                                    ("**>> yaffs chunk %d was not erased"
 369                                     TENDSTR), chunk));
 370                         } else {
 371                                 writeOk =
 372                                     yaffs_WriteChunkWithTagsToNAND(dev, chunk,
 373                                                                    data, tags);
 374                         }
 375
 376                         attempts++;
 377
 378                         if (writeOk) {
 379                                 /*
 380                                  *  Copy the data into the robustification buffer.
 381                                  *  NB We do this at the end to prevent duplicates in the case of a write error.
 382                                  *  Todo
 383                                  */
 384                                 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
 385
 386                         } else {
 387                                 /* The erased check or write failed */
 388                                 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
 389                         }
 390                 }
 391
 392         } while (chunk >= 0 && !writeOk);
 393
 394         if (attempts > 1) {
 395                 T(YAFFS_TRACE_ERROR,
 396                   (TSTR("**>> yaffs write required %d attempts" TENDSTR),
 397                    attempts));
 398                 dev->nRetriedWrites += (attempts - 1);
 399         }
 400
 401         return chunk;
 402 }
 403
 404 /*
 405  * Block retiring for handling a broken block.
 406  */
 407
 408 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
 409 {
 410
 411         yaffs_InvalidateCheckpoint(dev);
 412
 413         yaffs_MarkBlockBad(dev, blockInNAND);
 414
 415         yaffs_GetBlockInfo(dev, blockInNAND)->blockState =
 416             YAFFS_BLOCK_STATE_DEAD;
 417
 418         dev->nRetiredBlocks++;
 419 }
 420
 421 /*
 422  * Functions for robustisizing TODO
 423  *
 424  */
 425
 426 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
 427                                      const __u8 * data,
 428                                      const yaffs_ExtendedTags * tags)
 429 {
 430 }
 431
 432 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
 433                                     const yaffs_ExtendedTags * tags)
 434 {
 435 }
 436
 437 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
 438 {
 439
 440         int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
 441         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
 442         bi->gcPrioritise = 1;
 443
 444         if(erasedOk) {
 445                 /* Was an actual write failure, so mark the block for retirement  */
 446
 447                 bi->needsRetiring = 1;
 448         }
 449
 450         /* Delete the chunk */
 451         yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
 452 }
 453
 454
 455 /*---------------- Name handling functions ------------*/
 456
 457 static __u16 yaffs_CalcNameSum(const YCHAR * name)
 458 {
 459         __u16 sum = 0;
 460         __u16 i = 1;
 461
 462         YUCHAR *bname = (YUCHAR *) name;
 463         if (bname) {
 464                 while ((*bname) && (i <= YAFFS_MAX_NAME_LENGTH)) {
 465
 466 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
 467                         sum += yaffs_toupper(*bname) * i;
 468 #else
 469                         sum += (*bname) * i;
 470 #endif
 471                         i++;
 472                         bname++;
 473                 }
 474         }
 475         return sum;
 476 }
 477
 478 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
 479 {
 480 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
 481         if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
 482                 yaffs_strcpy(obj->shortName, name);
 483         } else {
 484                 obj->shortName[0] = _Y('\0');
 485         }
 486 #endif
 487         obj->sum = yaffs_CalcNameSum(name);
 488 }
 489
 490 /*-------------------- TNODES -------------------
 491
 492  * List of spare tnodes
 493  * The list is hooked together using the first pointer
 494  * in the tnode.
 495  */
 496
 497 /* yaffs_CreateTnodes creates a bunch more tnodes and
 498  * adds them to the tnode free list.
 499  * Don't use this function directly
 500  */
 501
 502 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
 503 {
 504         int i;
 505         int tnodeSize;
 506         yaffs_Tnode *newTnodes;
 507         __u8 *mem;
 508         yaffs_Tnode *curr;
 509         yaffs_Tnode *next;
 510         yaffs_TnodeList *tnl;
 511
 512         if (nTnodes < 1)
 513                 return YAFFS_OK;
 514
 515         /* Calculate the tnode size in bytes for variable width tnode support.
 516          * Must be a multiple of 32-bits  */
 517         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
 518
 519         /* make these things */
 520
 521         newTnodes = YMALLOC(nTnodes * tnodeSize);
 522         mem = (__u8 *)newTnodes;
 523
 524         if (!newTnodes) {
 525                 T(YAFFS_TRACE_ERROR,
 526                   (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
 527                 return YAFFS_FAIL;
 528         }
 529
 530         /* Hook them into the free list */
 531 #if 0
 532         for (i = 0; i < nTnodes - 1; i++) {
 533                 newTnodes[i].internal[0] = &newTnodes[i + 1];
 534 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 535                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
 536 #endif
 537         }
 538
 539         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
 540 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 541         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
 542 #endif
 543         dev->freeTnodes = newTnodes;
 544 #else
 545         /* New hookup for wide tnodes */
 546         for(i = 0; i < nTnodes -1; i++) {
 547                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
 548                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
 549                 curr->internal[0] = next;
 550         }
 551
 552         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
 553         curr->internal[0] = dev->freeTnodes;
 554         dev->freeTnodes = (yaffs_Tnode *)mem;
 555
 556 #endif
 557
 558
 559         dev->nFreeTnodes += nTnodes;
 560         dev->nTnodesCreated += nTnodes;
 561
 562         /* Now add this bunch of tnodes to a list for freeing up.
 563          * NB If we can't add this to the management list it isn't fatal
 564          * but it just means we can't free this bunch of tnodes later.
 565          */
 566
 567         tnl = YMALLOC(sizeof(yaffs_TnodeList));
 568         if (!tnl) {
 569                 T(YAFFS_TRACE_ERROR,
 570                   (TSTR
 571                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
 572
 573         } else {
 574                 tnl->tnodes = newTnodes;
 575                 tnl->next = dev->allocatedTnodeList;
 576                 dev->allocatedTnodeList = tnl;
 577         }
 578
 579         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
 580
 581         return YAFFS_OK;
 582 }
 583
 584 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
 585
 586 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
 587 {
 588         yaffs_Tnode *tn = NULL;
 589
 590         /* If there are none left make more */
 591         if (!dev->freeTnodes) {
 592                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
 593         }
 594
 595         if (dev->freeTnodes) {
 596                 tn = dev->freeTnodes;
 597 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 598                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
 599                         /* Hoosterman, this thing looks like it isn't in the list */
 600                         T(YAFFS_TRACE_ALWAYS,
 601                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
 602                 }
 603 #endif
 604                 dev->freeTnodes = dev->freeTnodes->internal[0];
 605                 dev->nFreeTnodes--;
 606         }
 607
 608         return tn;
 609 }
 610
 611 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
 612 {
 613         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
 614
 615         if(tn)
 616                 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
 617
 618         return tn;
 619 }
 620
 621 /* FreeTnode frees up a tnode and puts it back on the free list */
 622 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
 623 {
 624         if (tn) {
 625 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 626                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
 627                         /* Hoosterman, this thing looks like it is already in the list */
 628                         T(YAFFS_TRACE_ALWAYS,
 629                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
 630                 }
 631                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
 632 #endif
 633                 tn->internal[0] = dev->freeTnodes;
 634                 dev->freeTnodes = tn;
 635                 dev->nFreeTnodes++;
 636         }
 637 }
 638
 639 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
 640 {
 641         /* Free the list of allocated tnodes */
 642         yaffs_TnodeList *tmp;
 643
 644         while (dev->allocatedTnodeList) {
 645                 tmp = dev->allocatedTnodeList->next;
 646
 647                 YFREE(dev->allocatedTnodeList->tnodes);
 648                 YFREE(dev->allocatedTnodeList);
 649                 dev->allocatedTnodeList = tmp;
 650
 651         }
 652
 653         dev->freeTnodes = NULL;
 654         dev->nFreeTnodes = 0;
 655 }
 656
 657 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
 658 {
 659         dev->allocatedTnodeList = NULL;
 660         dev->freeTnodes = NULL;
 661         dev->nFreeTnodes = 0;
 662         dev->nTnodesCreated = 0;
 663
 664 }
 665
 666
 667 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
 668 {
 669   __u32 *map = (__u32 *)tn;
 670   __u32 bitInMap;
 671   __u32 bitInWord;
 672   __u32 wordInMap;
 673   __u32 mask;
 674
 675   pos &= YAFFS_TNODES_LEVEL0_MASK;
 676   val >>= dev->chunkGroupBits;
 677
 678   bitInMap = pos * dev->tnodeWidth;
 679   wordInMap = bitInMap /32;
 680   bitInWord = bitInMap & (32 -1);
 681
 682   mask = dev->tnodeMask << bitInWord;
 683
 684   map[wordInMap] &= ~mask;
 685   map[wordInMap] |= (mask & (val << bitInWord));
 686
 687   if(dev->tnodeWidth > (32-bitInWord)) {
 688     bitInWord = (32 - bitInWord);
 689     wordInMap++;;
 690     mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
 691     map[wordInMap] &= ~mask;
 692     map[wordInMap] |= (mask & (val >> bitInWord));
 693   }
 694 }
 695
 696 __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
 697 {
 698   __u32 *map = (__u32 *)tn;
 699   __u32 bitInMap;
 700   __u32 bitInWord;
 701   __u32 wordInMap;
 702   __u32 val;
 703
 704   pos &= YAFFS_TNODES_LEVEL0_MASK;
 705
 706   bitInMap = pos * dev->tnodeWidth;
 707   wordInMap = bitInMap /32;
 708   bitInWord = bitInMap & (32 -1);
 709
 710   val = map[wordInMap] >> bitInWord;
 711
 712   if(dev->tnodeWidth > (32-bitInWord)) {
 713     bitInWord = (32 - bitInWord);
 714     wordInMap++;;
 715     val |= (map[wordInMap] << bitInWord);
 716   }
 717
 718   val &= dev->tnodeMask;
 719   val <<= dev->chunkGroupBits;
 720
 721   return val;
 722 }
 723
 724 /* ------------------- End of individual tnode manipulation -----------------*/
 725
 726 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
 727  * The look up tree is represented by the top tnode and the number of topLevel
 728  * in the tree. 0 means only the level 0 tnode is in the tree.
 729  */
 730
 731 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
 732 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
 733                                           yaffs_FileStructure * fStruct,
 734                                           __u32 chunkId)
 735 {
 736
 737         yaffs_Tnode *tn = fStruct->top;
 738         __u32 i;
 739         int requiredTallness;
 740         int level = fStruct->topLevel;
 741
 742         /* Check sane level and chunk Id */
 743         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
 744                 return NULL;
 745         }
 746
 747         if (chunkId > YAFFS_MAX_CHUNK_ID) {
 748                 return NULL;
 749         }
 750
 751         /* First check we're tall enough (ie enough topLevel) */
 752
 753         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
 754         requiredTallness = 0;
 755         while (i) {
 756                 i >>= YAFFS_TNODES_INTERNAL_BITS;
 757                 requiredTallness++;
 758         }
 759
 760         if (requiredTallness > fStruct->topLevel) {
 761                 /* Not tall enough, so we can't find it, return NULL. */
 762                 return NULL;
 763         }
 764
 765         /* Traverse down to level 0 */
 766         while (level > 0 && tn) {
 767                 tn = tn->
 768                     internal[(chunkId >>
 769                                ( YAFFS_TNODES_LEVEL0_BITS +
 770                                  (level - 1) *
 771                                  YAFFS_TNODES_INTERNAL_BITS)
 772                               ) &
 773                              YAFFS_TNODES_INTERNAL_MASK];
 774                 level--;
 775
 776         }
 777
 778         return tn;
 779 }
 780
 781 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
 782  * This happens in two steps:
 783  *  1. If the tree isn't tall enough, then make it taller.
 784  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
 785  *
 786  * Used when modifying the tree.
 787  *
 788  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
 789  *  be plugged into the ttree.
 790  */
 791
 792 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
 793                                                yaffs_FileStructure * fStruct,
 794                                                __u32 chunkId,
 795                                                yaffs_Tnode *passedTn)
 796 {
 797
 798         int requiredTallness;
 799         int i;
 800         int l;
 801         yaffs_Tnode *tn;
 802
 803         __u32 x;
 804
 805
 806         /* Check sane level and page Id */
 807         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
 808                 return NULL;
 809         }
 810
 811         if (chunkId > YAFFS_MAX_CHUNK_ID) {
 812                 return NULL;
 813         }
 814
 815         /* First check we're tall enough (ie enough topLevel) */
 816
 817         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
 818         requiredTallness = 0;
 819         while (x) {
 820                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 821                 requiredTallness++;
 822         }
 823
 824
 825         if (requiredTallness > fStruct->topLevel) {
 826                 /* Not tall enough,gotta make the tree taller */
 827                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
 828
 829                         tn = yaffs_GetTnode(dev);
 830
 831                         if (tn) {
 832                                 tn->internal[0] = fStruct->top;
 833                                 fStruct->top = tn;
 834                         } else {
 835                                 T(YAFFS_TRACE_ERROR,
 836                                   (TSTR("yaffs: no more tnodes" TENDSTR)));
 837                         }
 838                 }
 839
 840                 fStruct->topLevel = requiredTallness;
 841         }
 842
 843         /* Traverse down to level 0, adding anything we need */
 844
 845         l = fStruct->topLevel;
 846         tn = fStruct->top;
 847
 848         if(l > 0) {
 849                 while (l > 0 && tn) {
 850                         x = (chunkId >>
 851                              ( YAFFS_TNODES_LEVEL0_BITS +
 852                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
 853                             YAFFS_TNODES_INTERNAL_MASK;
 854
 855
 856                         if((l>1) && !tn->internal[x]){
 857                                 /* Add missing non-level-zero tnode */
 858                                 tn->internal[x] = yaffs_GetTnode(dev);
 859
 860                         } else if(l == 1) {
 861                                 /* Looking from level 1 at level 0 */
 862                                 if (passedTn) {
 863                                         /* If we already have one, then release it.*/
 864                                         if(tn->internal[x])
 865                                                 yaffs_FreeTnode(dev,tn->internal[x]);
 866                                         tn->internal[x] = passedTn;
 867
 868                                 } else if(!tn->internal[x]) {
 869                                         /* Don't have one, none passed in */
 870                                         tn->internal[x] = yaffs_GetTnode(dev);
 871                                 }
 872                         }
 873
 874                         tn = tn->internal[x];
 875                         l--;
 876                 }
 877         } else {
 878                 /* top is level 0 */
 879                 if(passedTn) {
 880                         memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
 881                         yaffs_FreeTnode(dev,passedTn);
 882                 }
 883         }
 884
 885         return tn;
 886 }
 887
 888 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
 889                                   yaffs_ExtendedTags * tags, int objectId,
 890                                   int chunkInInode)
 891 {
 892         int j;
 893
 894         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
 895                 if (yaffs_CheckChunkBit
 896                     (dev, theChunk / dev->nChunksPerBlock,
 897                      theChunk % dev->nChunksPerBlock)) {
 898                         yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
 899                                                         tags);
 900                         if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
 901                                 /* found it; */
 902                                 return theChunk;
 903
 904                         }
 905                 }
 906                 theChunk++;
 907         }
 908         return -1;
 909 }
 910
 911
 912 /* DeleteWorker scans backwards through the tnode tree and deletes all the
 913  * chunks and tnodes in the file
 914  * Returns 1 if the tree was deleted.
 915  * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
 916  */
 917
 918 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
 919                               int chunkOffset, int *limit)
 920 {
 921         int i;
 922         int chunkInInode;
 923         int theChunk;
 924         yaffs_ExtendedTags tags;
 925         int foundChunk;
 926         yaffs_Device *dev = in->myDev;
 927
 928         int allDone = 1;
 929
 930         if (tn) {
 931                 if (level > 0) {
 932
 933                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
 934                              i--) {
 935                                 if (tn->internal[i]) {
 936                                         if (limit && (*limit) < 0) {
 937                                                 allDone = 0;
 938                                         } else {
 939                                                 allDone =
 940                                                     yaffs_DeleteWorker(in,
 941                                                                        tn->
 942                                                                        internal
 943                                                                        [i],
 944                                                                        level -
 945                                                                        1,
 946                                                                        (chunkOffset
 947                                                                         <<
 948                                                                         YAFFS_TNODES_INTERNAL_BITS)
 949                                                                        + i,
 950                                                                        limit);
 951                                         }
 952                                         if (allDone) {
 953                                                 yaffs_FreeTnode(dev,
 954                                                                 tn->
 955                                                                 internal[i]);
 956                                                 tn->internal[i] = NULL;
 957                                         }
 958                                 }
 959
 960                         }
 961                         return (allDone) ? 1 : 0;
 962                 } else if (level == 0) {
 963                         int hitLimit = 0;
 964
 965                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
 966                              i--) {
 967                                 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
 968                                 if (theChunk) {
 969
 970                                         chunkInInode =
 971                                             (chunkOffset <<
 972                                              YAFFS_TNODES_LEVEL0_BITS) + i;
 973
 974                                         foundChunk =
 975                                             yaffs_FindChunkInGroup(dev,
 976                                                                    theChunk,
 977                                                                    &tags,
 978                                                                    in->objectId,
 979                                                                    chunkInInode);
 980
 981                                         if (foundChunk > 0) {
 982                                                 yaffs_DeleteChunk(dev,
 983                                                                   foundChunk, 1,
 984                                                                   __LINE__);
 985                                                 in->nDataChunks--;
 986                                                 if (limit) {
 987                                                         *limit = *limit - 1;
 988                                                         if (*limit <= 0) {
 989                                                                 hitLimit = 1;
 990                                                         }
 991                                                 }
 992
 993                                         }
 994
 995                                         yaffs_PutLevel0Tnode(dev,tn,i,0);
 996                                 }
 997
 998                         }
 999                         return (i < 0) ? 1 : 0;
1000
1001                 }
1002
1003         }
1004
1005         return 1;
1006
1007 }
1008
1009 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1010 {
1011
1012         yaffs_BlockInfo *theBlock;
1013
1014         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1015
1016         theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1017         if (theBlock) {
1018                 theBlock->softDeletions++;
1019                 dev->nFreeChunks++;
1020         }
1021 }
1022
1023 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1024  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1025  * of the tnode.
1026  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1027  */
1028
1029 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1030                                   __u32 level, int chunkOffset)
1031 {
1032         int i;
1033         int theChunk;
1034         int allDone = 1;
1035         yaffs_Device *dev = in->myDev;
1036
1037         if (tn) {
1038                 if (level > 0) {
1039
1040                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1041                              i--) {
1042                                 if (tn->internal[i]) {
1043                                         allDone =
1044                                             yaffs_SoftDeleteWorker(in,
1045                                                                    tn->
1046                                                                    internal[i],
1047                                                                    level - 1,
1048                                                                    (chunkOffset
1049                                                                     <<
1050                                                                     YAFFS_TNODES_INTERNAL_BITS)
1051                                                                    + i);
1052                                         if (allDone) {
1053                                                 yaffs_FreeTnode(dev,
1054                                                                 tn->
1055                                                                 internal[i]);
1056                                                 tn->internal[i] = NULL;
1057                                         } else {
1058                                                 /* Hoosterman... how could this happen? */
1059                                         }
1060                                 }
1061                         }
1062                         return (allDone) ? 1 : 0;
1063                 } else if (level == 0) {
1064
1065                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1066                                 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1067                                 if (theChunk) {
1068                                         /* Note this does not find the real chunk, only the chunk group.
1069                                          * We make an assumption that a chunk group is not larger than
1070                                          * a block.
1071                                          */
1072                                         yaffs_SoftDeleteChunk(dev, theChunk);
1073                                         yaffs_PutLevel0Tnode(dev,tn,i,0);
1074                                 }
1075
1076                         }
1077                         return 1;
1078
1079                 }
1080
1081         }
1082
1083         return 1;
1084
1085 }
1086
1087 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1088 {
1089         if (obj->deleted &&
1090             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1091                 if (obj->nDataChunks <= 0) {
1092                         /* Empty file with no duplicate object headers, just delete it immediately */
1093                         yaffs_FreeTnode(obj->myDev,
1094                                         obj->variant.fileVariant.top);
1095                         obj->variant.fileVariant.top = NULL;
1096                         T(YAFFS_TRACE_TRACING,
1097                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1098                            obj->objectId));
1099                         yaffs_DoGenericObjectDeletion(obj);
1100                 } else {
1101                         yaffs_SoftDeleteWorker(obj,
1102                                                obj->variant.fileVariant.top,
1103                                                obj->variant.fileVariant.
1104                                                topLevel, 0);
1105                         obj->softDeleted = 1;
1106                 }
1107         }
1108 }
1109
1110 /* Pruning removes any part of the file structure tree that is beyond the
1111  * bounds of the file (ie that does not point to chunks).
1112  *
1113  * A file should only get pruned when its size is reduced.
1114  *
1115  * Before pruning, the chunks must be pulled from the tree and the
1116  * level 0 tnode entries must be zeroed out.
1117  * Could also use this for file deletion, but that's probably better handled
1118  * by a special case.
1119  */
1120
1121 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1122                                       __u32 level, int del0)
1123 {
1124         int i;
1125         int hasData;
1126
1127         if (tn) {
1128                 hasData = 0;
1129
1130                 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1131                         if (tn->internal[i] && level > 0) {
1132                                 tn->internal[i] =
1133                                     yaffs_PruneWorker(dev, tn->internal[i],
1134                                                       level - 1,
1135                                                       (i == 0) ? del0 : 1);
1136                         }
1137
1138                         if (tn->internal[i]) {
1139                                 hasData++;
1140                         }
1141                 }
1142
1143                 if (hasData == 0 && del0) {
1144                         /* Free and return NULL */
1145
1146                         yaffs_FreeTnode(dev, tn);
1147                         tn = NULL;
1148                 }
1149
1150         }
1151
1152         return tn;
1153
1154 }
1155
1156 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1157                                     yaffs_FileStructure * fStruct)
1158 {
1159         int i;
1160         int hasData;
1161         int done = 0;
1162         yaffs_Tnode *tn;
1163
1164         if (fStruct->topLevel > 0) {
1165                 fStruct->top =
1166                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1167
1168                 /* Now we have a tree with all the non-zero branches NULL but the height
1169                  * is the same as it was.
1170                  * Let's see if we can trim internal tnodes to shorten the tree.
1171                  * We can do this if only the 0th element in the tnode is in use
1172                  * (ie all the non-zero are NULL)
1173                  */
1174
1175                 while (fStruct->topLevel && !done) {
1176                         tn = fStruct->top;
1177
1178                         hasData = 0;
1179                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1180                                 if (tn->internal[i]) {
1181                                         hasData++;
1182                                 }
1183                         }
1184
1185                         if (!hasData) {
1186                                 fStruct->top = tn->internal[0];
1187                                 fStruct->topLevel--;
1188                                 yaffs_FreeTnode(dev, tn);
1189                         } else {
1190                                 done = 1;
1191                         }
1192                 }
1193         }
1194
1195         return YAFFS_OK;
1196 }
1197
1198 /*-------------------- End of File Structure functions.-------------------*/
1199
1200 /* yaffs_CreateFreeObjects creates a bunch more objects and
1201  * adds them to the object free list.
1202  */
1203 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1204 {
1205         int i;
1206         yaffs_Object *newObjects;
1207         yaffs_ObjectList *list;
1208
1209         if (nObjects < 1)
1210                 return YAFFS_OK;
1211
1212         /* make these things */
1213         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1214
1215         if (!newObjects) {
1216                 T(YAFFS_TRACE_ALLOCATE,
1217                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1218                 return YAFFS_FAIL;
1219         }
1220
1221         /* Hook them into the free list */
1222         for (i = 0; i < nObjects - 1; i++) {
1223                 newObjects[i].siblings.next =
1224                     (struct list_head *)(&newObjects[i + 1]);
1225         }
1226
1227         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1228         dev->freeObjects = newObjects;
1229         dev->nFreeObjects += nObjects;
1230         dev->nObjectsCreated += nObjects;
1231
1232         /* Now add this bunch of Objects to a list for freeing up. */
1233
1234         list = YMALLOC(sizeof(yaffs_ObjectList));
1235         if (!list) {
1236                 T(YAFFS_TRACE_ALLOCATE,
1237                   (TSTR("Could not add objects to management list" TENDSTR)));
1238         } else {
1239                 list->objects = newObjects;
1240                 list->next = dev->allocatedObjectList;
1241                 dev->allocatedObjectList = list;
1242         }
1243
1244         return YAFFS_OK;
1245 }
1246
1247
1248 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1249 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1250 {
1251         yaffs_Object *tn = NULL;
1252
1253         /* If there are none left make more */
1254         if (!dev->freeObjects) {
1255                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1256         }
1257
1258         if (dev->freeObjects) {
1259                 tn = dev->freeObjects;
1260                 dev->freeObjects =
1261                     (yaffs_Object *) (dev->freeObjects->siblings.next);
1262                 dev->nFreeObjects--;
1263
1264                 /* Now sweeten it up... */
1265
1266                 memset(tn, 0, sizeof(yaffs_Object));
1267                 tn->myDev = dev;
1268                 tn->chunkId = -1;
1269                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1270                 INIT_LIST_HEAD(&(tn->hardLinks));
1271                 INIT_LIST_HEAD(&(tn->hashLink));
1272                 INIT_LIST_HEAD(&tn->siblings);
1273
1274                 /* Add it to the lost and found directory.
1275                  * NB Can't put root or lostNFound in lostNFound so
1276                  * check if lostNFound exists first
1277                  */
1278                 if (dev->lostNFoundDir) {
1279                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1280                 }
1281         }
1282
1283         return tn;
1284 }
1285
1286 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1287                                                __u32 mode)
1288 {
1289
1290         yaffs_Object *obj =
1291             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1292         if (obj) {
1293                 obj->fake = 1;          /* it is fake so it has no NAND presence... */
1294                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1295                 obj->unlinkAllowed = 0; /* ... or unlink it */
1296                 obj->deleted = 0;
1297                 obj->unlinked = 0;
1298                 obj->yst_mode = mode;
1299                 obj->myDev = dev;
1300                 obj->chunkId = 0;       /* Not a valid chunk. */
1301         }
1302
1303         return obj;
1304
1305 }
1306
1307 static void yaffs_UnhashObject(yaffs_Object * tn)
1308 {
1309         int bucket;
1310         yaffs_Device *dev = tn->myDev;
1311
1312         /* If it is still linked into the bucket list, free from the list */
1313         if (!list_empty(&tn->hashLink)) {
1314                 list_del_init(&tn->hashLink);
1315                 bucket = yaffs_HashFunction(tn->objectId);
1316                 dev->objectBucket[bucket].count--;
1317         }
1318
1319 }
1320
1321 /*  FreeObject frees up a Object and puts it back on the free list */
1322 static void yaffs_FreeObject(yaffs_Object * tn)
1323 {
1324
1325         yaffs_Device *dev = tn->myDev;
1326
1327 #ifdef  __KERNEL__
1328         if (tn->myInode) {
1329                 /* We're still hooked up to a cached inode.
1330                  * Don't delete now, but mark for later deletion
1331                  */
1332                 tn->deferedFree = 1;
1333                 return;
1334         }
1335 #endif
1336
1337         yaffs_UnhashObject(tn);
1338
1339         /* Link into the free list. */
1340         tn->siblings.next = (struct list_head *)(dev->freeObjects);
1341         dev->freeObjects = tn;
1342         dev->nFreeObjects++;
1343 }
1344
1345 #ifdef __KERNEL__
1346
1347 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1348 {
1349         if (obj->deferedFree) {
1350                 yaffs_FreeObject(obj);
1351         }
1352 }
1353
1354 #endif
1355
1356 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1357 {
1358         /* Free the list of allocated Objects */
1359
1360         yaffs_ObjectList *tmp;
1361
1362         while (dev->allocatedObjectList) {
1363                 tmp = dev->allocatedObjectList->next;
1364                 YFREE(dev->allocatedObjectList->objects);
1365                 YFREE(dev->allocatedObjectList);
1366
1367                 dev->allocatedObjectList = tmp;
1368         }
1369
1370         dev->freeObjects = NULL;
1371         dev->nFreeObjects = 0;
1372 }
1373
1374 static void yaffs_InitialiseObjects(yaffs_Device * dev)
1375 {
1376         int i;
1377
1378         dev->allocatedObjectList = NULL;
1379         dev->freeObjects = NULL;
1380         dev->nFreeObjects = 0;
1381
1382         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1383                 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1384                 dev->objectBucket[i].count = 0;
1385         }
1386
1387 }
1388
1389 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
1390 {
1391         static int x = 0;
1392         int i;
1393         int l = 999;
1394         int lowest = 999999;
1395
1396         /* First let's see if we can find one that's empty. */
1397
1398         for (i = 0; i < 10 && lowest > 0; i++) {
1399                 x++;
1400                 x %= YAFFS_NOBJECT_BUCKETS;
1401                 if (dev->objectBucket[x].count < lowest) {
1402                         lowest = dev->objectBucket[x].count;
1403                         l = x;
1404                 }
1405
1406         }
1407
1408         /* If we didn't find an empty list, then try
1409          * looking a bit further for a short one
1410          */
1411
1412         for (i = 0; i < 10 && lowest > 3; i++) {
1413                 x++;
1414                 x %= YAFFS_NOBJECT_BUCKETS;
1415                 if (dev->objectBucket[x].count < lowest) {
1416                         lowest = dev->objectBucket[x].count;
1417                         l = x;
1418                 }
1419
1420         }
1421
1422         return l;
1423 }
1424
1425 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
1426 {
1427         int bucket = yaffs_FindNiceObjectBucket(dev);
1428
1429         /* Now find an object value that has not already been taken
1430          * by scanning the list.
1431          */
1432
1433         int found = 0;
1434         struct list_head *i;
1435
1436         __u32 n = (__u32) bucket;
1437
1438         /* yaffs_CheckObjectHashSanity();  */
1439
1440         while (!found) {
1441                 found = 1;
1442                 n += YAFFS_NOBJECT_BUCKETS;
1443                 if (1 || dev->objectBucket[bucket].count > 0) {
1444                         list_for_each(i, &dev->objectBucket[bucket].list) {
1445                                 /* If there is already one in the list */
1446                                 if (i
1447                                     && list_entry(i, yaffs_Object,
1448                                                   hashLink)->objectId == n) {
1449                                         found = 0;
1450                                 }
1451                         }
1452                 }
1453         }
1454
1455
1456         return n;
1457 }
1458
1459 static void yaffs_HashObject(yaffs_Object * in)
1460 {
1461         int bucket = yaffs_HashFunction(in->objectId);
1462         yaffs_Device *dev = in->myDev;
1463
1464         list_add(&in->hashLink, &dev->objectBucket[bucket].list);
1465         dev->objectBucket[bucket].count++;
1466
1467 }
1468
1469 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
1470 {
1471         int bucket = yaffs_HashFunction(number);
1472         struct list_head *i;
1473         yaffs_Object *in;
1474
1475         list_for_each(i, &dev->objectBucket[bucket].list) {
1476                 /* Look if it is in the list */
1477                 if (i) {
1478                         in = list_entry(i, yaffs_Object, hashLink);
1479                         if (in->objectId == number) {
1480 #ifdef __KERNEL__
1481                                 /* Don't tell the VFS about this one if it is defered free */
1482                                 if (in->deferedFree)
1483                                         return NULL;
1484 #endif
1485
1486                                 return in;
1487                         }
1488                 }
1489         }
1490
1491         return NULL;
1492 }
1493
1494 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
1495                                     yaffs_ObjectType type)
1496 {
1497
1498         yaffs_Object *theObject;
1499
1500         if (number < 0) {
1501                 number = yaffs_CreateNewObjectNumber(dev);
1502         }
1503
1504         theObject = yaffs_AllocateEmptyObject(dev);
1505
1506         if (theObject) {
1507                 theObject->fake = 0;
1508                 theObject->renameAllowed = 1;
1509                 theObject->unlinkAllowed = 1;
1510                 theObject->objectId = number;
1511                 yaffs_HashObject(theObject);
1512                 theObject->variantType = type;
1513 #ifdef CONFIG_YAFFS_WINCE
1514                 yfsd_WinFileTimeNow(theObject->win_atime);
1515                 theObject->win_ctime[0] = theObject->win_mtime[0] =
1516                     theObject->win_atime[0];
1517                 theObject->win_ctime[1] = theObject->win_mtime[1] =
1518                     theObject->win_atime[1];
1519
1520 #else
1521
1522                 theObject->yst_atime = theObject->yst_mtime =
1523                     theObject->yst_ctime = Y_CURRENT_TIME;
1524 #endif
1525                 switch (type) {
1526                 case YAFFS_OBJECT_TYPE_FILE:
1527                         theObject->variant.fileVariant.fileSize = 0;
1528                         theObject->variant.fileVariant.scannedFileSize = 0;
1529                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
1530                         theObject->variant.fileVariant.topLevel = 0;
1531                         theObject->variant.fileVariant.top =
1532                             yaffs_GetTnode(dev);
1533                         break;
1534                 case YAFFS_OBJECT_TYPE_DIRECTORY:
1535                         INIT_LIST_HEAD(&theObject->variant.directoryVariant.
1536                                        children);
1537                         break;
1538                 case YAFFS_OBJECT_TYPE_SYMLINK:
1539                 case YAFFS_OBJECT_TYPE_HARDLINK:
1540                 case YAFFS_OBJECT_TYPE_SPECIAL:
1541                         /* No action required */
1542                         break;
1543                 case YAFFS_OBJECT_TYPE_UNKNOWN:
1544                         /* todo this should not happen */
1545                         break;
1546                 }
1547         }
1548
1549         return theObject;
1550 }
1551
1552 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
1553                                                       int number,
1554                                                       yaffs_ObjectType type)
1555 {
1556         yaffs_Object *theObject = NULL;
1557
1558         if (number > 0) {
1559                 theObject = yaffs_FindObjectByNumber(dev, number);
1560         }
1561
1562         if (!theObject) {
1563                 theObject = yaffs_CreateNewObject(dev, number, type);
1564         }
1565
1566         return theObject;
1567
1568 }
1569
1570
1571 static YCHAR *yaffs_CloneString(const YCHAR * str)
1572 {
1573         YCHAR *newStr = NULL;
1574
1575         if (str && *str) {
1576                 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
1577                 yaffs_strcpy(newStr, str);
1578         }
1579
1580         return newStr;
1581
1582 }
1583
1584 /*
1585  * Mknod (create) a new object.
1586  * equivalentObject only has meaning for a hard link;
1587  * aliasString only has meaning for a sumlink.
1588  * rdev only has meaning for devices (a subset of special objects)
1589  */
1590
1591 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
1592                                        yaffs_Object * parent,
1593                                        const YCHAR * name,
1594                                        __u32 mode,
1595                                        __u32 uid,
1596                                        __u32 gid,
1597                                        yaffs_Object * equivalentObject,
1598                                        const YCHAR * aliasString, __u32 rdev)
1599 {
1600         yaffs_Object *in;
1601
1602         yaffs_Device *dev = parent->myDev;
1603
1604         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
1605         if (yaffs_FindObjectByName(parent, name)) {
1606                 return NULL;
1607         }
1608
1609         in = yaffs_CreateNewObject(dev, -1, type);
1610
1611         if (in) {
1612                 in->chunkId = -1;
1613                 in->valid = 1;
1614                 in->variantType = type;
1615
1616                 in->yst_mode = mode;
1617
1618 #ifdef CONFIG_YAFFS_WINCE
1619                 yfsd_WinFileTimeNow(in->win_atime);
1620                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1621                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1622
1623 #else
1624                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1625
1626                 in->yst_rdev = rdev;
1627                 in->yst_uid = uid;
1628                 in->yst_gid = gid;
1629 #endif
1630                 in->nDataChunks = 0;
1631
1632                 yaffs_SetObjectName(in, name);
1633                 in->dirty = 1;
1634
1635                 yaffs_AddObjectToDirectory(parent, in);
1636
1637                 in->myDev = parent->myDev;
1638
1639                 switch (type) {
1640                 case YAFFS_OBJECT_TYPE_SYMLINK:
1641                         in->variant.symLinkVariant.alias =
1642                             yaffs_CloneString(aliasString);
1643                         break;
1644                 case YAFFS_OBJECT_TYPE_HARDLINK:
1645                         in->variant.hardLinkVariant.equivalentObject =
1646                             equivalentObject;
1647                         in->variant.hardLinkVariant.equivalentObjectId =
1648                             equivalentObject->objectId;
1649                         list_add(&in->hardLinks, &equivalentObject->hardLinks);
1650                         break;
1651                 case YAFFS_OBJECT_TYPE_FILE:
1652                 case YAFFS_OBJECT_TYPE_DIRECTORY:
1653                 case YAFFS_OBJECT_TYPE_SPECIAL:
1654                 case YAFFS_OBJECT_TYPE_UNKNOWN:
1655                         /* do nothing */
1656                         break;
1657                 }
1658
1659                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
1660                         /* Could not create the object header, fail the creation */
1661                         yaffs_DestroyObject(in);
1662                         in = NULL;
1663                 }
1664
1665         }
1666
1667         return in;
1668 }
1669
1670 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
1671                               __u32 mode, __u32 uid, __u32 gid)
1672 {
1673         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1674                                  uid, gid, NULL, NULL, 0);
1675 }
1676
1677 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
1678                                    __u32 mode, __u32 uid, __u32 gid)
1679 {
1680         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1681                                  mode, uid, gid, NULL, NULL, 0);
1682 }
1683
1684 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
1685                                  __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1686 {
1687         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1688                                  uid, gid, NULL, NULL, rdev);
1689 }
1690
1691 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
1692                                  __u32 mode, __u32 uid, __u32 gid,
1693                                  const YCHAR * alias)
1694 {
1695         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1696                                  uid, gid, NULL, alias, 0);
1697 }
1698
1699 /* yaffs_Link returns the object id of the equivalent object.*/
1700 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
1701                          yaffs_Object * equivalentObject)
1702 {
1703         /* Get the real object in case we were fed a hard link as an equivalent object */
1704         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1705
1706         if (yaffs_MknodObject
1707             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1708              equivalentObject, NULL, 0)) {
1709                 return equivalentObject;
1710         } else {
1711                 return NULL;
1712         }
1713
1714 }
1715
1716 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
1717                                   const YCHAR * newName, int force, int shadows)
1718 {
1719         int unlinkOp;
1720         int deleteOp;
1721
1722         yaffs_Object *existingTarget;
1723
1724         if (newDir == NULL) {
1725                 newDir = obj->parent;   /* use the old directory */
1726         }
1727
1728         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
1729                 T(YAFFS_TRACE_ALWAYS,
1730                   (TSTR
1731                    ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
1732                     TENDSTR)));
1733                 YBUG();
1734         }
1735
1736         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1737         if (obj->myDev->isYaffs2) {
1738                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
1739         } else {
1740                 unlinkOp = (newDir == obj->myDev->unlinkedDir
1741                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1742         }
1743
1744         deleteOp = (newDir == obj->myDev->deletedDir);
1745
1746         existingTarget = yaffs_FindObjectByName(newDir, newName);
1747
1748         /* If the object is a file going into the unlinked directory,
1749          *   then it is OK to just stuff it in since duplicate names are allowed.
1750          *   else only proceed if the new name does not exist and if we're putting
1751          *   it into a directory.
1752          */
1753         if ((unlinkOp ||
1754              deleteOp ||
1755              force ||
1756              (shadows > 0) ||
1757              !existingTarget) &&
1758             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
1759                 yaffs_SetObjectName(obj, newName);
1760                 obj->dirty = 1;
1761
1762                 yaffs_AddObjectToDirectory(newDir, obj);
1763
1764                 if (unlinkOp)
1765                         obj->unlinked = 1;
1766
1767                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1768                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
1769                         return YAFFS_OK;
1770         }
1771
1772         return YAFFS_FAIL;
1773 }
1774
1775 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
1776                        yaffs_Object * newDir, const YCHAR * newName)
1777 {
1778         yaffs_Object *obj;
1779         yaffs_Object *existingTarget;
1780         int force = 0;
1781
1782 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1783         /* Special case for case insemsitive systems (eg. WinCE).
1784          * While look-up is case insensitive, the name isn't.
1785          * Therefore we might want to change x.txt to X.txt
1786         */
1787         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
1788                 force = 1;
1789         }
1790 #endif
1791
1792         obj = yaffs_FindObjectByName(oldDir, oldName);
1793         /* Check new name to long. */
1794         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
1795             yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
1796           /* ENAMETOOLONG */
1797           return YAFFS_FAIL;
1798         else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
1799                  yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
1800           /* ENAMETOOLONG */
1801           return YAFFS_FAIL;
1802
1803         if (obj && obj->renameAllowed) {
1804
1805                 /* Now do the handling for an existing target, if there is one */
1806
1807                 existingTarget = yaffs_FindObjectByName(newDir, newName);
1808                 if (existingTarget &&
1809                     existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1810                     !list_empty(&existingTarget->variant.directoryVariant.children)) {
1811                         /* There is a target that is a non-empty directory, so we fail */
1812                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
1813                 } else if (existingTarget && existingTarget != obj) {
1814                         /* Nuke the target first, using shadowing,
1815                          * but only if it isn't the same object
1816                          */
1817                         yaffs_ChangeObjectName(obj, newDir, newName, force,
1818                                                existingTarget->objectId);
1819                         yaffs_UnlinkObject(existingTarget);
1820                 }
1821
1822                 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
1823         }
1824         return YAFFS_FAIL;
1825 }
1826
1827 /*------------------------- Block Management and Page Allocation ----------------*/
1828
1829 static int yaffs_InitialiseBlocks(yaffs_Device * dev)
1830 {
1831         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
1832
1833         dev->allocationBlock = -1;      /* force it to get a new one */
1834
1835         /* Todo we're assuming the malloc will pass. */
1836         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
1837         if(!dev->blockInfo){
1838                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
1839                 dev->blockInfoAlt = 1;
1840         }
1841         else
1842                 dev->blockInfoAlt = 0;
1843
1844         /* Set up dynamic blockinfo stuff. */
1845         dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; // round up bytes
1846         dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
1847         if(!dev->chunkBits){
1848                 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
1849                 dev->chunkBitsAlt = 1;
1850         }
1851         else
1852                 dev->chunkBitsAlt = 0;
1853
1854         if (dev->blockInfo && dev->chunkBits) {
1855                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
1856                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
1857                 return YAFFS_OK;
1858         }
1859
1860         return YAFFS_FAIL;
1861
1862 }
1863
1864 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
1865 {
1866         if(dev->blockInfoAlt)
1867                 YFREE_ALT(dev->blockInfo);
1868         else
1869                 YFREE(dev->blockInfo);
1870         dev->blockInfoAlt = 0;
1871
1872         dev->blockInfo = NULL;
1873
1874         if(dev->chunkBitsAlt)
1875                 YFREE_ALT(dev->chunkBits);
1876         else
1877                 YFREE(dev->chunkBits);
1878         dev->chunkBitsAlt = 0;
1879         dev->chunkBits = NULL;
1880 }
1881
1882 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
1883                                             yaffs_BlockInfo * bi)
1884 {
1885         int i;
1886         __u32 seq;
1887         yaffs_BlockInfo *b;
1888
1889         if (!dev->isYaffs2)
1890                 return 1;       /* disqualification only applies to yaffs2. */
1891
1892         if (!bi->hasShrinkHeader)
1893                 return 1;       /* can gc */
1894
1895         /* Find the oldest dirty sequence number if we don't know it and save it
1896          * so we don't have to keep recomputing it.
1897          */
1898         if (!dev->oldestDirtySequence) {
1899                 seq = dev->sequenceNumber;
1900
1901                 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
1902                      i++) {
1903                         b = yaffs_GetBlockInfo(dev, i);
1904                         if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1905                             (b->pagesInUse - b->softDeletions) <
1906                             dev->nChunksPerBlock && b->sequenceNumber < seq) {
1907                                 seq = b->sequenceNumber;
1908                         }
1909                 }
1910                 dev->oldestDirtySequence = seq;
1911         }
1912
1913         /* Can't do gc of this block if there are any blocks older than this one that have
1914          * discarded pages.
1915          */
1916         return (bi->sequenceNumber <= dev->oldestDirtySequence);
1917
1918         return 1;
1919
1920 }
1921
1922 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
1923  * for garbage collection.
1924  */
1925
1926 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
1927                                                int aggressive)
1928 {
1929
1930         int b = dev->currentDirtyChecker;
1931
1932         int i;
1933         int iterations;
1934         int dirtiest = -1;
1935         int pagesInUse;
1936         int prioritised;
1937         yaffs_BlockInfo *bi;
1938         static int nonAggressiveSkip = 0;
1939
1940         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
1941          * search harder.
1942          * else (we're doing a leasurely gc), then we only bother to do this if the
1943          * block has only a few pages in use.
1944          */
1945
1946         nonAggressiveSkip--;
1947
1948         if (!aggressive && (nonAggressiveSkip > 0)) {
1949                 return -1;
1950         }
1951
1952         pagesInUse =
1953             (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
1954
1955         if (aggressive) {
1956                 iterations =
1957                     dev->internalEndBlock - dev->internalStartBlock + 1;
1958         } else {
1959                 iterations =
1960                     dev->internalEndBlock - dev->internalStartBlock + 1;
1961                 iterations = iterations / 16;
1962                 if (iterations > 200) {
1963                         iterations = 200;
1964                 }
1965         }
1966
1967         for (i = 0, prioritised = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
1968                 b++;
1969                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1970                         b = dev->internalStartBlock;
1971                 }
1972
1973                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1974                         T(YAFFS_TRACE_ERROR,
1975                           (TSTR("**>> Block %d is not valid" TENDSTR), b));
1976                         YBUG();
1977                 }
1978
1979                 bi = yaffs_GetBlockInfo(dev, b);
1980
1981 #if 0
1982                 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
1983                         dirtiest = b;
1984                         pagesInUse = 0;
1985                 }
1986                 else
1987 #endif
1988
1989                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
1990                       (bi->gcPrioritise || (bi->pagesInUse - bi->softDeletions)) < pagesInUse &&
1991                         yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
1992                         dirtiest = b;
1993                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
1994                         if(bi->gcPrioritise)
1995                                 prioritised = 1; /* Trick it into selecting this one */
1996                 }
1997         }
1998
1999         dev->currentDirtyChecker = b;
2000
2001         if (dirtiest > 0) {
2002                 T(YAFFS_TRACE_GC,
2003                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2004                    dev->nChunksPerBlock - pagesInUse,prioritised));
2005         }
2006
2007         dev->oldestDirtySequence = 0;
2008
2009         if (dirtiest > 0) {
2010                 nonAggressiveSkip = 4;
2011         }
2012
2013         return dirtiest;
2014 }
2015
2016 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
2017 {
2018         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2019
2020         int erasedOk = 0;
2021
2022         /* If the block is still healthy erase it and mark as clean.
2023          * If the block has had a data failure, then retire it.
2024          */
2025         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2026
2027         if (!bi->needsRetiring) {
2028                 yaffs_InvalidateCheckpoint(dev);
2029                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2030                 if (!erasedOk) {
2031                         dev->nErasureFailures++;
2032                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2033                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2034                 }
2035         }
2036
2037         if (erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE)) {
2038                 int i;
2039                 for (i = 0; i < dev->nChunksPerBlock; i++) {
2040                         if (!yaffs_CheckChunkErased
2041                             (dev, blockNo * dev->nChunksPerBlock + i)) {
2042                                 T(YAFFS_TRACE_ERROR,
2043                                   (TSTR
2044                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2045                                     TENDSTR), blockNo, i));
2046                         }
2047                 }
2048         }
2049
2050         if (erasedOk) {
2051                 /* Clean it up... */
2052                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2053                 dev->nErasedBlocks++;
2054                 bi->pagesInUse = 0;
2055                 bi->softDeletions = 0;
2056                 bi->hasShrinkHeader = 0;
2057                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2058                 bi->gcPrioritise = 0;
2059                 yaffs_ClearChunkBits(dev, blockNo);
2060
2061                 T(YAFFS_TRACE_ERASE,
2062                   (TSTR("Erased block %d" TENDSTR), blockNo));
2063         } else {
2064                 dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
2065
2066                 yaffs_RetireBlock(dev, blockNo);
2067                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2068                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2069         }
2070 }
2071
2072 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2073 {
2074         int i;
2075
2076         yaffs_BlockInfo *bi;
2077
2078         if (dev->nErasedBlocks < 1) {
2079                 /* Hoosterman we've got a problem.
2080                  * Can't get space to gc
2081                  */
2082                 T(YAFFS_TRACE_ERROR,
2083                   (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2084
2085                 return -1;
2086         }
2087
2088         /* Find an empty block. */
2089
2090         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2091                 dev->allocationBlockFinder++;
2092                 if (dev->allocationBlockFinder < dev->internalStartBlock
2093                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2094                         dev->allocationBlockFinder = dev->internalStartBlock;
2095                 }
2096
2097                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2098
2099                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2100                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2101                         dev->sequenceNumber++;
2102                         bi->sequenceNumber = dev->sequenceNumber;
2103                         dev->nErasedBlocks--;
2104                         T(YAFFS_TRACE_ALLOCATE,
2105                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2106                            dev->allocationBlockFinder, dev->sequenceNumber,
2107                            dev->nErasedBlocks));
2108                         return dev->allocationBlockFinder;
2109                 }
2110         }
2111
2112         T(YAFFS_TRACE_ALWAYS,
2113           (TSTR
2114            ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2115             TENDSTR), dev->nErasedBlocks));
2116
2117         return -1;
2118 }
2119
2120
2121 // Check if there's space to allocate...
2122 // Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2123 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2124 {
2125         int reservedChunks;
2126         int reservedBlocks = dev->nReservedBlocks;
2127         int checkpointBlocks;
2128
2129         checkpointBlocks =  dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
2130         if(checkpointBlocks < 0)
2131                 checkpointBlocks = 0;
2132
2133         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2134
2135         return (dev->nFreeChunks > reservedChunks);
2136 }
2137
2138 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
2139 {
2140         int retVal;
2141         yaffs_BlockInfo *bi;
2142
2143         if (dev->allocationBlock < 0) {
2144                 /* Get next block to allocate off */
2145                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2146                 dev->allocationPage = 0;
2147         }
2148
2149         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2150                 /* Not enough space to allocate unless we're allowed to use the reserve. */
2151                 return -1;
2152         }
2153
2154         if (dev->nErasedBlocks < dev->nReservedBlocks
2155             && dev->allocationPage == 0) {
2156                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2157         }
2158
2159         /* Next page please.... */
2160         if (dev->allocationBlock >= 0) {
2161                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2162
2163                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2164                     dev->allocationPage;
2165                 bi->pagesInUse++;
2166                 yaffs_SetChunkBit(dev, dev->allocationBlock,
2167                                   dev->allocationPage);
2168
2169                 dev->allocationPage++;
2170
2171                 dev->nFreeChunks--;
2172
2173                 /* If the block is full set the state to full */
2174                 if (dev->allocationPage >= dev->nChunksPerBlock) {
2175                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2176                         dev->allocationBlock = -1;
2177                 }
2178
2179                 if(blockUsedPtr)
2180                         *blockUsedPtr = bi;
2181
2182                 return retVal;
2183         }
2184
2185         T(YAFFS_TRACE_ERROR,
2186           (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2187
2188         return -1;
2189 }
2190
2191 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2192 {
2193         int n;
2194
2195         n = dev->nErasedBlocks * dev->nChunksPerBlock;
2196
2197         if (dev->allocationBlock > 0) {
2198                 n += (dev->nChunksPerBlock - dev->allocationPage);
2199         }
2200
2201         return n;
2202
2203 }
2204
2205 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2206 {
2207         int oldChunk;
2208         int newChunk;
2209         int chunkInBlock;
2210         int markNAND;
2211         int retVal = YAFFS_OK;
2212         int cleanups = 0;
2213         int i;
2214         int isCheckpointBlock;
2215
2216         int chunksBefore = yaffs_GetErasedChunks(dev);
2217         int chunksAfter;
2218
2219         yaffs_ExtendedTags tags;
2220
2221         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2222
2223         yaffs_Object *object;
2224
2225         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2226
2227         bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2228
2229         T(YAFFS_TRACE_TRACING,
2230           (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2231            bi->pagesInUse, bi->hasShrinkHeader));
2232
2233         /*yaffs_VerifyFreeChunks(dev); */
2234
2235         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
2236
2237         /* Take off the number of soft deleted entries because
2238          * they're going to get really deleted during GC.
2239          */
2240         dev->nFreeChunks -= bi->softDeletions;
2241
2242         dev->isDoingGC = 1;
2243
2244         if (isCheckpointBlock ||
2245             !yaffs_StillSomeChunkBits(dev, block)) {
2246                 T(YAFFS_TRACE_TRACING,
2247                   (TSTR
2248                    ("Collecting block %d that has no chunks in use" TENDSTR),
2249                    block));
2250                 yaffs_BlockBecameDirty(dev, block);
2251         } else {
2252
2253                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2254
2255                 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2256                      chunkInBlock < dev->nChunksPerBlock
2257                      && yaffs_StillSomeChunkBits(dev, block);
2258                      chunkInBlock++, oldChunk++) {
2259                         if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2260
2261                                 /* This page is in use and might need to be copied off */
2262
2263                                 markNAND = 1;
2264
2265                                 yaffs_InitialiseTags(&tags);
2266
2267                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2268                                                                 buffer, &tags);
2269
2270                                 object =
2271                                     yaffs_FindObjectByNumber(dev,
2272                                                              tags.objectId);
2273
2274                                 T(YAFFS_TRACE_GC_DETAIL,
2275                                   (TSTR
2276                                    ("Collecting page %d, %d %d %d " TENDSTR),
2277                                    chunkInBlock, tags.objectId, tags.chunkId,
2278                                    tags.byteCount));
2279
2280                                 if (!object) {
2281                                         T(YAFFS_TRACE_ERROR,
2282                                           (TSTR
2283                                            ("page %d in gc has no object "
2284                                             TENDSTR), oldChunk));
2285                                 }
2286
2287                                 if (object && object->deleted
2288                                     && tags.chunkId != 0) {
2289                                         /* Data chunk in a deleted file, throw it away
2290                                          * It's a soft deleted data chunk,
2291                                          * No need to copy this, just forget about it and
2292                                          * fix up the object.
2293                                          */
2294
2295                                         object->nDataChunks--;
2296
2297                                         if (object->nDataChunks <= 0) {
2298                                                 /* remeber to clean up the object */
2299                                                 dev->gcCleanupList[cleanups] =
2300                                                     tags.objectId;
2301                                                 cleanups++;
2302                                         }
2303                                         markNAND = 0;
2304                                 } else if (0
2305                                            /* Todo object && object->deleted && object->nDataChunks == 0 */
2306                                            ) {
2307                                         /* Deleted object header with no data chunks.
2308                                          * Can be discarded and the file deleted.
2309                                          */
2310                                         object->chunkId = 0;
2311                                         yaffs_FreeTnode(object->myDev,
2312                                                         object->variant.
2313                                                         fileVariant.top);
2314                                         object->variant.fileVariant.top = NULL;
2315                                         yaffs_DoGenericObjectDeletion(object);
2316
2317                                 } else if (object) {
2318                                         /* It's either a data chunk in a live file or
2319                                          * an ObjectHeader, so we're interested in it.
2320                                          * NB Need to keep the ObjectHeaders of deleted files
2321                                          * until the whole file has been deleted off
2322                                          */
2323                                         tags.serialNumber++;
2324
2325                                         dev->nGCCopies++;
2326
2327                                         if (tags.chunkId == 0) {
2328                                                 /* It is an object Id,
2329                                                  * We need to nuke the shrinkheader flags first
2330                                                  * We no longer want the shrinkHeader flag since its work is done
2331                                                  * and if it is left in place it will mess up scanning.
2332                                                  * Also, clear out any shadowing stuff
2333                                                  */
2334
2335                                                 yaffs_ObjectHeader *oh;
2336                                                 oh = (yaffs_ObjectHeader *)buffer;
2337                                                 oh->isShrink = 0;
2338                                                 oh->shadowsObject = -1;
2339                                                 tags.extraShadows = 0;
2340                                                 tags.extraIsShrinkHeader = 0;
2341                                         }
2342
2343                                         newChunk =
2344                                             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2345
2346                                         if (newChunk < 0) {
2347                                                 retVal = YAFFS_FAIL;
2348                                         } else {
2349
2350                                                 /* Ok, now fix up the Tnodes etc. */
2351
2352                                                 if (tags.chunkId == 0) {
2353                                                         /* It's a header */
2354                                                         object->chunkId =  newChunk;
2355                                                         object->serial =   tags.serialNumber;
2356                                                 } else {
2357                                                         /* It's a data chunk */
2358                                                         yaffs_PutChunkIntoFile
2359                                                             (object,
2360                                                              tags.chunkId,
2361                                                              newChunk, 0);
2362                                                 }
2363                                         }
2364                                 }
2365
2366                                 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2367
2368                         }
2369                 }
2370
2371                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2372
2373
2374                 /* Do any required cleanups */
2375                 for (i = 0; i < cleanups; i++) {
2376                         /* Time to delete the file too */
2377                         object =
2378                             yaffs_FindObjectByNumber(dev,
2379                                                      dev->gcCleanupList[i]);
2380                         if (object) {
2381                                 yaffs_FreeTnode(dev,
2382                                                 object->variant.fileVariant.
2383                                                 top);
2384                                 object->variant.fileVariant.top = NULL;
2385                                 T(YAFFS_TRACE_GC,
2386                                   (TSTR
2387                                    ("yaffs: About to finally delete object %d"
2388                                     TENDSTR), object->objectId));
2389                                 yaffs_DoGenericObjectDeletion(object);
2390                                 object->myDev->nDeletedFiles--;
2391                         }
2392
2393                 }
2394
2395         }
2396
2397         if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
2398                 T(YAFFS_TRACE_GC,
2399                   (TSTR
2400                    ("gc did not increase free chunks before %d after %d"
2401                     TENDSTR), chunksBefore, chunksAfter));
2402         }
2403
2404         dev->isDoingGC = 0;
2405
2406         return YAFFS_OK;
2407 }
2408
2409 /* New garbage collector
2410  * If we're very low on erased blocks then we do aggressive garbage collection
2411  * otherwise we do "leasurely" garbage collection.
2412  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2413  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2414  *
2415  * The idea is to help clear out space in a more spread-out manner.
2416  * Dunno if it really does anything useful.
2417  */
2418 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
2419 {
2420         int block;
2421         int aggressive;
2422         int gcOk = YAFFS_OK;
2423         int maxTries = 0;
2424
2425         int checkpointBlockAdjust;
2426
2427         if (dev->isDoingGC) {
2428                 /* Bail out so we don't get recursive gc */
2429                 return YAFFS_OK;
2430         }
2431
2432         /* This loop should pass the first time.
2433          * We'll only see looping here if the erase of the collected block fails.
2434          */
2435
2436         do {
2437                 maxTries++;
2438
2439                 checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
2440                 if(checkpointBlockAdjust < 0)
2441                         checkpointBlockAdjust = 0;
2442
2443                 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust)) {
2444                         /* We need a block soon...*/
2445                         aggressive = 1;
2446                 } else {
2447                         /* We're in no hurry */
2448                         aggressive = 0;
2449                 }
2450
2451                 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
2452
2453                 if (block > 0) {
2454                         dev->garbageCollections++;
2455                         if (!aggressive) {
2456                                 dev->passiveGarbageCollections++;
2457                         }
2458
2459                         T(YAFFS_TRACE_GC,
2460                           (TSTR
2461                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
2462                            dev->nErasedBlocks, aggressive));
2463
2464                         gcOk = yaffs_GarbageCollectBlock(dev, block);
2465                 }
2466
2467                 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
2468                         T(YAFFS_TRACE_GC,
2469                           (TSTR
2470                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
2471                             TENDSTR), dev->nErasedBlocks, maxTries, block));
2472                 }
2473         } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
2474                  && (maxTries < 2));
2475
2476         return aggressive ? gcOk : YAFFS_OK;
2477 }
2478
2479 /*-------------------------  TAGS --------------------------------*/
2480
2481 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
2482                            int chunkInObject)
2483 {
2484         return (tags->chunkId == chunkInObject &&
2485                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
2486
2487 }
2488
2489
2490 /*-------------------- Data file manipulation -----------------*/
2491
2492 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
2493                                  yaffs_ExtendedTags * tags)
2494 {
2495         /*Get the Tnode, then get the level 0 offset chunk offset */
2496         yaffs_Tnode *tn;
2497         int theChunk = -1;
2498         yaffs_ExtendedTags localTags;
2499         int retVal = -1;
2500
2501         yaffs_Device *dev = in->myDev;
2502
2503         if (!tags) {
2504                 /* Passed a NULL, so use our own tags space */
2505                 tags = &localTags;
2506         }
2507
2508         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2509
2510         if (tn) {
2511                 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2512
2513                 retVal =
2514                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2515                                            chunkInInode);
2516         }
2517         return retVal;
2518 }
2519
2520 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
2521                                           yaffs_ExtendedTags * tags)
2522 {
2523         /* Get the Tnode, then get the level 0 offset chunk offset */
2524         yaffs_Tnode *tn;
2525         int theChunk = -1;
2526         yaffs_ExtendedTags localTags;
2527
2528         yaffs_Device *dev = in->myDev;
2529         int retVal = -1;
2530
2531         if (!tags) {
2532                 /* Passed a NULL, so use our own tags space */
2533                 tags = &localTags;
2534         }
2535
2536         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2537
2538         if (tn) {
2539
2540                 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2541
2542                 retVal =
2543                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2544                                            chunkInInode);
2545
2546                 /* Delete the entry in the filestructure (if found) */
2547                 if (retVal != -1) {
2548                         yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
2549                 }
2550         } else {
2551                 /*T(("No level 0 found for %d\n", chunkInInode)); */
2552         }
2553
2554         if (retVal == -1) {
2555                 /* T(("Could not find %d to delete\n",chunkInInode)); */
2556         }
2557         return retVal;
2558 }
2559
2560 #ifdef YAFFS_PARANOID
2561
2562 static int yaffs_CheckFileSanity(yaffs_Object * in)
2563 {
2564         int chunk;
2565         int nChunks;
2566         int fSize;
2567         int failed = 0;
2568         int objId;
2569         yaffs_Tnode *tn;
2570         yaffs_Tags localTags;
2571         yaffs_Tags *tags = &localTags;
2572         int theChunk;
2573         int chunkDeleted;
2574
2575         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2576                 /* T(("Object not a file\n")); */
2577                 return YAFFS_FAIL;
2578         }
2579
2580         objId = in->objectId;
2581         fSize = in->variant.fileVariant.fileSize;
2582         nChunks =
2583             (fSize + in->myDev->nBytesPerChunk - 1) / in->myDev->nBytesPerChunk;
2584
2585         for (chunk = 1; chunk <= nChunks; chunk++) {
2586                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
2587                                            chunk);
2588
2589                 if (tn) {
2590
2591                         theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
2592
2593                         if (yaffs_CheckChunkBits
2594                             (dev, theChunk / dev->nChunksPerBlock,
2595                              theChunk % dev->nChunksPerBlock)) {
2596
2597                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
2598                                                             tags,
2599                                                             &chunkDeleted);
2600                                 if (yaffs_TagsMatch
2601                                     (tags, in->objectId, chunk, chunkDeleted)) {
2602                                         /* found it; */
2603
2604                                 }
2605                         } else {
2606
2607                                 failed = 1;
2608                         }
2609
2610                 } else {
2611                         /* T(("No level 0 found for %d\n", chunk)); */
2612                 }
2613         }
2614
2615         return failed ? YAFFS_FAIL : YAFFS_OK;
2616 }
2617
2618 #endif
2619
2620 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
2621                                   int chunkInNAND, int inScan)
2622 {
2623         /* NB inScan is zero unless scanning.
2624          * For forward scanning, inScan is > 0;
2625          * for backward scanning inScan is < 0
2626          */
2627
2628         yaffs_Tnode *tn;
2629         yaffs_Device *dev = in->myDev;
2630         int existingChunk;
2631         yaffs_ExtendedTags existingTags;
2632         yaffs_ExtendedTags newTags;
2633         unsigned existingSerial, newSerial;
2634
2635         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2636                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2637                  * If it is not during Scanning then something went wrong!
2638                  */
2639                 if (!inScan) {
2640                         T(YAFFS_TRACE_ERROR,
2641                           (TSTR
2642                            ("yaffs tragedy:attempt to put data chunk into a non-file"
2643                             TENDSTR)));
2644                         YBUG();
2645                 }
2646
2647                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
2648                 return YAFFS_OK;
2649         }
2650
2651         tn = yaffs_AddOrFindLevel0Tnode(dev,
2652                                         &in->variant.fileVariant,
2653                                         chunkInInode,
2654                                         NULL);
2655         if (!tn) {
2656                 return YAFFS_FAIL;
2657         }
2658
2659         existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2660
2661         if (inScan != 0) {
2662                 /* If we're scanning then we need to test for duplicates
2663                  * NB This does not need to be efficient since it should only ever
2664                  * happen when the power fails during a write, then only one
2665                  * chunk should ever be affected.
2666                  *
2667                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2668                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2669                  */
2670
2671                 if (existingChunk != 0) {
2672                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
2673                          *    thus we have to do a FindChunkInFile to get the real chunk id.
2674                          *
2675                          * We have a duplicate now we need to decide which one to use:
2676                          *
2677                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2678                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2679                          * YAFFS1: Get both sets of tags and compare serial numbers.
2680                          */
2681
2682                         if (inScan > 0) {
2683                                 /* Only do this for forward scanning */
2684                                 yaffs_ReadChunkWithTagsFromNAND(dev,
2685                                                                 chunkInNAND,
2686                                                                 NULL, &newTags);
2687
2688                                 /* Do a proper find */
2689                                 existingChunk =
2690                                     yaffs_FindChunkInFile(in, chunkInInode,
2691                                                           &existingTags);
2692                         }
2693
2694                         if (existingChunk <= 0) {
2695                                 /*Hoosterman - how did this happen? */
2696
2697                                 T(YAFFS_TRACE_ERROR,
2698                                   (TSTR
2699                                    ("yaffs tragedy: existing chunk < 0 in scan"
2700                                     TENDSTR)));
2701
2702                         }
2703
2704                         /* NB The deleted flags should be false, otherwise the chunks will
2705                          * not be loaded during a scan
2706                          */
2707
2708                         newSerial = newTags.serialNumber;
2709                         existingSerial = existingTags.serialNumber;
2710
2711                         if ((inScan > 0) &&
2712                             (in->myDev->isYaffs2 ||
2713                              existingChunk <= 0 ||
2714                              ((existingSerial + 1) & 3) == newSerial)) {
2715                                 /* Forward scanning.
2716                                  * Use new
2717                                  * Delete the old one and drop through to update the tnode
2718                                  */
2719                                 yaffs_DeleteChunk(dev, existingChunk, 1,
2720                                                   __LINE__);
2721                         } else {
2722                                 /* Backward scanning or we want to use the existing one
2723                                  * Use existing.
2724                                  * Delete the new one and return early so that the tnode isn't changed
2725                                  */
2726                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
2727                                                   __LINE__);
2728                                 return YAFFS_OK;
2729                         }
2730                 }
2731
2732         }
2733
2734         if (existingChunk == 0) {
2735                 in->nDataChunks++;
2736         }
2737
2738         yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
2739
2740         return YAFFS_OK;
2741 }
2742
2743 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
2744                                          __u8 * buffer)
2745 {
2746         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
2747
2748         if (chunkInNAND >= 0) {
2749                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
2750                                                        buffer, NULL);
2751         } else {
2752                 T(YAFFS_TRACE_NANDACCESS,
2753                   (TSTR("Chunk %d not found zero instead" TENDSTR),
2754                    chunkInNAND));
2755                 /* get sane (zero) data if you read a hole */
2756                 memset(buffer, 0, in->myDev->nBytesPerChunk);
2757                 return 0;
2758         }
2759
2760 }
2761
2762 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
2763 {
2764         int block;
2765         int page;
2766         yaffs_ExtendedTags tags;
2767         yaffs_BlockInfo *bi;
2768
2769         if (chunkId <= 0)
2770                 return;
2771
2772         dev->nDeletions++;
2773         block = chunkId / dev->nChunksPerBlock;
2774         page = chunkId % dev->nChunksPerBlock;
2775
2776         bi = yaffs_GetBlockInfo(dev, block);
2777
2778         T(YAFFS_TRACE_DELETION,
2779           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
2780
2781         if (markNAND &&
2782             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
2783
2784                 yaffs_InitialiseTags(&tags);
2785
2786                 tags.chunkDeleted = 1;
2787
2788                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
2789                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
2790         } else {
2791                 dev->nUnmarkedDeletions++;
2792         }
2793
2794         /* Pull out of the management area.
2795          * If the whole block became dirty, this will kick off an erasure.
2796          */
2797         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2798             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
2799             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2800             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
2801                 dev->nFreeChunks++;
2802
2803                 yaffs_ClearChunkBit(dev, block, page);
2804
2805                 bi->pagesInUse--;
2806
2807                 if (bi->pagesInUse == 0 &&
2808                     !bi->hasShrinkHeader &&
2809                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
2810                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2811                         yaffs_BlockBecameDirty(dev, block);
2812                 }
2813
2814         } else {
2815                 /* T(("Bad news deleting chunk %d\n",chunkId)); */
2816         }
2817
2818 }
2819
2820 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
2821                                         const __u8 * buffer, int nBytes,
2822                                         int useReserve)
2823 {
2824         /* Find old chunk Need to do this to get serial number
2825          * Write new one and patch into tree.
2826          * Invalidate old tags.
2827          */
2828
2829         int prevChunkId;
2830         yaffs_ExtendedTags prevTags;
2831
2832         int newChunkId;
2833         yaffs_ExtendedTags newTags;
2834
2835         yaffs_Device *dev = in->myDev;
2836
2837         yaffs_CheckGarbageCollection(dev);
2838
2839         /* Get the previous chunk at this location in the file if it exists */
2840         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
2841
2842         /* Set up new tags */
2843         yaffs_InitialiseTags(&newTags);
2844
2845         newTags.chunkId = chunkInInode;
2846         newTags.objectId = in->objectId;
2847         newTags.serialNumber =
2848             (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
2849         newTags.byteCount = nBytes;
2850
2851         newChunkId =
2852             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2853                                               useReserve);
2854
2855         if (newChunkId >= 0) {
2856                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
2857
2858                 if (prevChunkId >= 0) {
2859                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
2860
2861                 }
2862
2863                 yaffs_CheckFileSanity(in);
2864         }
2865         return newChunkId;
2866
2867 }
2868
2869 /* UpdateObjectHeader updates the header on NAND for an object.
2870  * If name is not NULL, then that new name is used.
2871  */
2872 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
2873                              int isShrink, int shadows)
2874 {
2875
2876         yaffs_BlockInfo *bi;
2877
2878         yaffs_Device *dev = in->myDev;
2879
2880         int prevChunkId;
2881         int retVal = 0;
2882
2883         int newChunkId;
2884         yaffs_ExtendedTags newTags;
2885
2886         __u8 *buffer = NULL;
2887         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
2888
2889         yaffs_ObjectHeader *oh = NULL;
2890
2891         if (!in->fake || force) {
2892
2893                 yaffs_CheckGarbageCollection(dev);
2894
2895                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
2896                 oh = (yaffs_ObjectHeader *) buffer;
2897
2898                 prevChunkId = in->chunkId;
2899
2900                 if (prevChunkId >= 0) {
2901                         yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
2902                                                         buffer, NULL);
2903                         memcpy(oldName, oh->name, sizeof(oh->name));
2904                 }
2905
2906                 memset(buffer, 0xFF, dev->nBytesPerChunk);
2907
2908                 oh->type = in->variantType;
2909                 oh->yst_mode = in->yst_mode;
2910                 oh->shadowsObject = shadows;
2911
2912 #ifdef CONFIG_YAFFS_WINCE
2913                 oh->win_atime[0] = in->win_atime[0];
2914                 oh->win_ctime[0] = in->win_ctime[0];
2915                 oh->win_mtime[0] = in->win_mtime[0];
2916                 oh->win_atime[1] = in->win_atime[1];
2917                 oh->win_ctime[1] = in->win_ctime[1];
2918                 oh->win_mtime[1] = in->win_mtime[1];
2919 #else
2920                 oh->yst_uid = in->yst_uid;
2921                 oh->yst_gid = in->yst_gid;
2922                 oh->yst_atime = in->yst_atime;
2923                 oh->yst_mtime = in->yst_mtime;
2924                 oh->yst_ctime = in->yst_ctime;
2925                 oh->yst_rdev = in->yst_rdev;
2926 #endif
2927                 if (in->parent) {
2928                         oh->parentObjectId = in->parent->objectId;
2929                 } else {
2930                         oh->parentObjectId = 0;
2931                 }
2932
2933                 if (name && *name) {
2934                         memset(oh->name, 0, sizeof(oh->name));
2935                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
2936                 } else if (prevChunkId) {
2937                         memcpy(oh->name, oldName, sizeof(oh->name));
2938                 } else {
2939                         memset(oh->name, 0, sizeof(oh->name));
2940                 }
2941
2942                 oh->isShrink = isShrink;
2943
2944                 switch (in->variantType) {
2945                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2946                         /* Should not happen */
2947                         break;
2948                 case YAFFS_OBJECT_TYPE_FILE:
2949                         oh->fileSize =
2950                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
2951                              || oh->parentObjectId ==
2952                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
2953                             fileVariant.fileSize;
2954                         break;
2955                 case YAFFS_OBJECT_TYPE_HARDLINK:
2956                         oh->equivalentObjectId =
2957                             in->variant.hardLinkVariant.equivalentObjectId;
2958                         break;
2959                 case YAFFS_OBJECT_TYPE_SPECIAL:
2960                         /* Do nothing */
2961                         break;
2962                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2963                         /* Do nothing */
2964                         break;
2965                 case YAFFS_OBJECT_TYPE_SYMLINK:
2966                         yaffs_strncpy(oh->alias,
2967                                       in->variant.symLinkVariant.alias,
2968                                       YAFFS_MAX_ALIAS_LENGTH);
2969                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
2970                         break;
2971                 }
2972
2973                 /* Tags */
2974                 yaffs_InitialiseTags(&newTags);
2975                 in->serial++;
2976                 newTags.chunkId = 0;
2977                 newTags.objectId = in->objectId;
2978                 newTags.serialNumber = in->serial;
2979
2980                 /* Add extra info for file header */
2981
2982                 newTags.extraHeaderInfoAvailable = 1;
2983                 newTags.extraParentObjectId = oh->parentObjectId;
2984                 newTags.extraFileLength = oh->fileSize;
2985                 newTags.extraIsShrinkHeader = oh->isShrink;
2986                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
2987                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
2988                 newTags.extraObjectType = in->variantType;
2989
2990                 /* Create new chunk in NAND */
2991                 newChunkId =
2992                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2993                                                       (prevChunkId >= 0) ? 1 : 0);
2994
2995                 if (newChunkId >= 0) {
2996
2997                         in->chunkId = newChunkId;
2998
2999                         if (prevChunkId >= 0) {
3000                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
3001                                                   __LINE__);
3002                         }
3003
3004                         if(!yaffs_ObjectHasCachedWriteData(in))
3005                                 in->dirty = 0;
3006
3007                         /* If this was a shrink, then mark the block that the chunk lives on */
3008                         if (isShrink) {
3009                                 bi = yaffs_GetBlockInfo(in->myDev,
3010                                                         newChunkId /in->myDev-> nChunksPerBlock);
3011                                 bi->hasShrinkHeader = 1;
3012                         }
3013
3014                 }
3015
3016                 retVal = newChunkId;
3017
3018         }
3019
3020         if (buffer)
3021                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3022
3023         return retVal;
3024 }
3025
3026 /*------------------------ Short Operations Cache ----------------------------------------
3027  *   In many situations where there is no high level buffering (eg WinCE) a lot of
3028  *   reads might be short sequential reads, and a lot of writes may be short
3029  *   sequential writes. eg. scanning/writing a jpeg file.
3030  *   In these cases, a short read/write cache can provide a huge perfomance benefit
3031  *   with dumb-as-a-rock code.
3032  *   In Linux, the page cache provides read buffering aand the short op cache provides write
3033  *   buffering.
3034  *
3035  *   There are a limited number (~10) of cache chunks per device so that we don't
3036  *   need a very intelligent search.
3037  */
3038
3039 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3040 {
3041         yaffs_Device *dev = obj->myDev;
3042         int i;
3043         yaffs_ChunkCache *cache;
3044         int nCaches = obj->myDev->nShortOpCaches;
3045
3046         if(nCaches > 0){
3047                 for(i = 0; i < nCaches; i++){
3048                         if (dev->srCache[i].object == obj &&
3049                                     dev->srCache[i].dirty)
3050                                         return 1;
3051                 }
3052         }
3053
3054         return 0;
3055 }
3056
3057
3058 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
3059 {
3060         yaffs_Device *dev = obj->myDev;
3061         int lowest = -99;       /* Stop compiler whining. */
3062         int i;
3063         yaffs_ChunkCache *cache;
3064         int chunkWritten = 0;
3065         int nCaches = obj->myDev->nShortOpCaches;
3066
3067         if (nCaches > 0) {
3068                 do {
3069                         cache = NULL;
3070
3071                         /* Find the dirty cache for this object with the lowest chunk id. */
3072                         for (i = 0; i < nCaches; i++) {
3073                                 if (dev->srCache[i].object == obj &&
3074                                     dev->srCache[i].dirty) {
3075                                         if (!cache
3076                                             || dev->srCache[i].chunkId <
3077                                             lowest) {
3078                                                 cache = &dev->srCache[i];
3079                                                 lowest = cache->chunkId;
3080                                         }
3081                                 }
3082                         }
3083
3084                         if (cache && !cache->locked) {
3085                                 /* Write it out and free it up */
3086
3087                                 chunkWritten =
3088                                     yaffs_WriteChunkDataToObject(cache->object,
3089                                                                  cache->chunkId,
3090                                                                  cache->data,
3091                                                                  cache->nBytes,
3092                                                                  1);
3093                                 cache->dirty = 0;
3094                                 cache->object = NULL;
3095                         }
3096
3097                 } while (cache && chunkWritten > 0);
3098
3099                 if (cache) {
3100                         /* Hoosterman, disk full while writing cache out. */
3101                         T(YAFFS_TRACE_ERROR,
3102                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3103
3104                 }
3105         }
3106
3107 }
3108
3109 /*yaffs_FlushEntireDeviceCache(dev)
3110  *
3111  *
3112  */
3113
3114 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3115 {
3116         yaffs_Object *obj;
3117         int nCaches = dev->nShortOpCaches;
3118         int i;
3119
3120         /* Find a dirty object in the cache and flush it...
3121          * until there are no further dirty objects.
3122          */
3123         do {
3124                 obj = NULL;
3125                 for( i = 0; i < nCaches && !obj; i++) {
3126                         if (dev->srCache[i].object &&
3127                             dev->srCache[i].dirty)
3128                                 obj = dev->srCache[i].object;
3129
3130                 }
3131                 if(obj)
3132                         yaffs_FlushFilesChunkCache(obj);
3133
3134         } while(obj);
3135
3136 }
3137
3138
3139 /* Grab us a cache chunk for use.
3140  * First look for an empty one.
3141  * Then look for the least recently used non-dirty one.
3142  * Then look for the least recently used dirty one...., flush and look again.
3143  */
3144 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3145 {
3146         int i;
3147         int usage;
3148         int theOne;
3149
3150         if (dev->nShortOpCaches > 0) {
3151                 for (i = 0; i < dev->nShortOpCaches; i++) {
3152                         if (!dev->srCache[i].object)
3153                                 return &dev->srCache[i];
3154                 }
3155
3156                 return NULL;
3157
3158                 theOne = -1;
3159                 usage = 0;      /* just to stop the compiler grizzling */
3160
3161                 for (i = 0; i < dev->nShortOpCaches; i++) {
3162                         if (!dev->srCache[i].dirty &&
3163                             ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3164                              theOne < 0)) {
3165                                 usage = dev->srCache[i].lastUse;
3166                                 theOne = i;
3167                         }
3168                 }
3169
3170
3171                 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3172         } else {
3173                 return NULL;
3174         }
3175
3176 }
3177
3178 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3179 {
3180         yaffs_ChunkCache *cache;
3181         yaffs_Object *theObj;
3182         int usage;
3183         int i;
3184         int pushout;
3185
3186         if (dev->nShortOpCaches > 0) {
3187                 /* Try find a non-dirty one... */
3188
3189                 cache = yaffs_GrabChunkCacheWorker(dev);
3190
3191                 if (!cache) {
3192                         /* They were all dirty, find the last recently used object and flush
3193                          * its cache, then  find again.
3194                          * NB what's here is not very accurate, we actually flush the object
3195                          * the last recently used page.
3196                          */
3197
3198                         /* With locking we can't assume we can use entry zero */
3199
3200                         theObj = NULL;
3201                         usage = -1;
3202                         cache = NULL;
3203                         pushout = -1;
3204
3205                         for (i = 0; i < dev->nShortOpCaches; i++) {
3206                                 if (dev->srCache[i].object &&
3207                                     !dev->srCache[i].locked &&
3208                                     (dev->srCache[i].lastUse < usage || !cache))
3209                                 {
3210                                         usage = dev->srCache[i].lastUse;
3211                                         theObj = dev->srCache[i].object;
3212                                         cache = &dev->srCache[i];
3213                                         pushout = i;
3214                                 }
3215                         }
3216
3217                         if (!cache || cache->dirty) {
3218                                 /* Flush and try again */
3219                                 yaffs_FlushFilesChunkCache(theObj);
3220                                 cache = yaffs_GrabChunkCacheWorker(dev);
3221                         }
3222
3223                 }
3224                 return cache;
3225         } else
3226                 return NULL;
3227
3228 }
3229
3230 /* Find a cached chunk */
3231 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3232                                               int chunkId)
3233 {
3234         yaffs_Device *dev = obj->myDev;
3235         int i;
3236         if (dev->nShortOpCaches > 0) {
3237                 for (i = 0; i < dev->nShortOpCaches; i++) {
3238                         if (dev->srCache[i].object == obj &&
3239                             dev->srCache[i].chunkId == chunkId) {
3240                                 dev->cacheHits++;
3241
3242                                 return &dev->srCache[i];
3243                         }
3244                 }
3245         }
3246         return NULL;
3247 }
3248
3249 /* Mark the chunk for the least recently used algorithym */
3250 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3251                                 int isAWrite)
3252 {
3253
3254         if (dev->nShortOpCaches > 0) {
3255                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3256                         /* Reset the cache usages */
3257                         int i;
3258                         for (i = 1; i < dev->nShortOpCaches; i++) {
3259                                 dev->srCache[i].lastUse = 0;
3260                         }
3261                         dev->srLastUse = 0;
3262                 }
3263
3264                 dev->srLastUse++;
3265
3266                 cache->lastUse = dev->srLastUse;
3267
3268                 if (isAWrite) {
3269                         cache->dirty = 1;
3270                 }
3271         }
3272 }
3273
3274 /* Invalidate a single cache page.
3275  * Do this when a whole page gets written,
3276  * ie the short cache for this page is no longer valid.
3277  */
3278 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
3279 {
3280         if (object->myDev->nShortOpCaches > 0) {
3281                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3282
3283                 if (cache) {
3284                         cache->object = NULL;
3285                 }
3286         }
3287 }
3288
3289 /* Invalidate all the cache pages associated with this object
3290  * Do this whenever ther file is deleted or resized.
3291  */
3292 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
3293 {
3294         int i;
3295         yaffs_Device *dev = in->myDev;
3296
3297         if (dev->nShortOpCaches > 0) {
3298                 /* Invalidate it. */
3299                 for (i = 0; i < dev->nShortOpCaches; i++) {
3300                         if (dev->srCache[i].object == in) {
3301                                 dev->srCache[i].object = NULL;
3302                         }
3303                 }
3304         }
3305 }
3306
3307 /*--------------------- Checkpointing --------------------*/
3308
3309
3310 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
3311 {
3312         yaffs_CheckpointValidity cp;
3313         cp.structType = sizeof(cp);
3314         cp.magic = YAFFS_MAGIC;
3315         cp.version = 1;
3316         cp.head = (head) ? 1 : 0;
3317
3318         return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
3319                 1 : 0;
3320 }
3321
3322 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
3323 {
3324         yaffs_CheckpointValidity cp;
3325         int ok;
3326
3327         ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3328
3329         if(ok)
3330                 ok = (cp.structType == sizeof(cp)) &&
3331                      (cp.magic == YAFFS_MAGIC) &&
3332                      (cp.version == 1) &&
3333                      (cp.head == ((head) ? 1 : 0));
3334         return ok ? 1 : 0;
3335 }
3336
3337 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
3338                                            yaffs_Device *dev)
3339 {
3340         cp->nErasedBlocks = dev->nErasedBlocks;
3341         cp->allocationBlock = dev->allocationBlock;
3342         cp->allocationPage = dev->allocationPage;
3343         cp->nFreeChunks = dev->nFreeChunks;
3344
3345         cp->nDeletedFiles = dev->nDeletedFiles;
3346         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
3347         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
3348         cp->sequenceNumber = dev->sequenceNumber;
3349         cp->oldestDirtySequence = dev->oldestDirtySequence;
3350
3351 }
3352
3353 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
3354                                            yaffs_CheckpointDevice *cp)
3355 {
3356         dev->nErasedBlocks = cp->nErasedBlocks;
3357         dev->allocationBlock = cp->allocationBlock;
3358         dev->allocationPage = cp->allocationPage;
3359         dev->nFreeChunks = cp->nFreeChunks;
3360
3361         dev->nDeletedFiles = cp->nDeletedFiles;
3362         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
3363         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
3364         dev->sequenceNumber = cp->sequenceNumber;
3365         dev->oldestDirtySequence = cp->oldestDirtySequence;
3366 }
3367
3368
3369 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
3370 {
3371         yaffs_CheckpointDevice cp;
3372         __u32 nBytes;
3373         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3374
3375         int ok;
3376
3377         /* Write device runtime values*/
3378         yaffs_DeviceToCheckpointDevice(&cp,dev);
3379         cp.structType = sizeof(cp);
3380
3381         ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3382
3383         /* Write block info */
3384         if(ok) {
3385                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3386                 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
3387         }
3388
3389         /* Write chunk bits */
3390         if(ok) {
3391                 nBytes = nBlocks * dev->chunkBitmapStride;
3392                 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
3393         }
3394         return   ok ? 1 : 0;
3395
3396 }
3397
3398 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
3399 {
3400         yaffs_CheckpointDevice cp;
3401         __u32 nBytes;
3402         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3403
3404         int ok;
3405
3406         ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3407         if(!ok)
3408                 return 0;
3409
3410         if(cp.structType != sizeof(cp))
3411                 return 0;
3412
3413
3414         yaffs_CheckpointDeviceToDevice(dev,&cp);
3415
3416         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3417
3418         ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
3419
3420         if(!ok)
3421                 return 0;
3422         nBytes = nBlocks * dev->chunkBitmapStride;
3423
3424         ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
3425
3426         return ok ? 1 : 0;
3427 }
3428
3429 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
3430                                            yaffs_Object *obj)
3431 {
3432
3433         cp->objectId = obj->objectId;
3434         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
3435         cp->chunkId = obj->chunkId;
3436         cp->variantType = obj->variantType;
3437         cp->deleted = obj->deleted;
3438         cp->softDeleted = obj->softDeleted;
3439         cp->unlinked = obj->unlinked;
3440         cp->fake = obj->fake;
3441         cp->renameAllowed = obj->renameAllowed;
3442         cp->unlinkAllowed = obj->unlinkAllowed;
3443         cp->serial = obj->serial;
3444         cp->nDataChunks = obj->nDataChunks;
3445
3446         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
3447                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
3448         else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3449                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
3450 }
3451
3452 static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
3453 {
3454
3455         yaffs_Object *parent;
3456
3457         obj->objectId = cp->objectId;
3458
3459         if(cp->parentId)
3460                 parent = yaffs_FindOrCreateObjectByNumber(
3461                                         obj->myDev,
3462                                         cp->parentId,
3463                                         YAFFS_OBJECT_TYPE_DIRECTORY);
3464         else
3465                 parent = NULL;
3466
3467         if(parent)
3468                 yaffs_AddObjectToDirectory(parent, obj);
3469
3470         obj->chunkId = cp->chunkId;
3471         obj->variantType = cp->variantType;
3472         obj->deleted = cp->deleted;
3473         obj->softDeleted = cp->softDeleted;
3474         obj->unlinked = cp->unlinked;
3475         obj->fake = cp->fake;
3476         obj->renameAllowed = cp->renameAllowed;
3477         obj->unlinkAllowed = cp->unlinkAllowed;
3478         obj->serial = cp->serial;
3479         obj->nDataChunks = cp->nDataChunks;
3480
3481         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
3482                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
3483         else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3484                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
3485
3486         if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
3487                 obj->lazyLoaded = 1;
3488 }
3489
3490
3491
3492 static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
3493                                         __u32 level, int chunkOffset)
3494 {
3495         int i;
3496         yaffs_Device *dev = in->myDev;
3497         int ok = 1;
3498         int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
3499
3500         if (tn) {
3501                 if (level > 0) {
3502
3503                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
3504                                 if (tn->internal[i]) {
3505                                         ok = yaffs_CheckpointTnodeWorker(in,
3506                                                         tn->internal[i],
3507                                                         level - 1,
3508                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
3509                                 }
3510                         }
3511                 } else if (level == 0) {
3512                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
3513                         /* printf("write tnode at %d\n",baseOffset); */
3514                         ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
3515                         if(ok)
3516                                 ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
3517                 }
3518         }
3519
3520         return ok;
3521
3522 }
3523
3524 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
3525 {
3526         __u32 endMarker = ~0;
3527         int ok = 1;
3528
3529         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
3530                 ok = yaffs_CheckpointTnodeWorker(obj,
3531                                             obj->variant.fileVariant.top,
3532                                             obj->variant.fileVariant.topLevel,
3533                                             0);
3534                 if(ok)
3535                         ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
3536                                 sizeof(endMarker));
3537         }
3538
3539         return ok ? 1 : 0;
3540 }
3541
3542 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
3543 {
3544         __u32 baseChunk;
3545         int ok = 1;
3546         yaffs_Device *dev = obj->myDev;
3547         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
3548         yaffs_Tnode *tn;
3549
3550         ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
3551
3552         while(ok && (~baseChunk)){
3553                 /* Read level 0 tnode */
3554
3555                 /* printf("read  tnode at %d\n",baseChunk); */
3556                 tn = yaffs_GetTnodeRaw(dev);
3557                 if(tn)
3558                         ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
3559                               (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
3560                 else
3561                         ok = 0;
3562
3563                 if(tn && ok){
3564                         ok = yaffs_AddOrFindLevel0Tnode(dev,
3565                                                         fileStructPtr,
3566                                                         baseChunk,
3567                                                         tn) ? 1 : 0;
3568                 }
3569
3570                 if(ok)
3571                         ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
3572
3573         }
3574
3575         return ok ? 1 : 0;
3576 }
3577
3578
3579 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
3580 {
3581         yaffs_Object *obj;
3582         yaffs_CheckpointObject cp;
3583         int i;
3584         int ok = 1;
3585         struct list_head *lh;
3586
3587
3588         /* Iterate through the objects in each hash entry,
3589          * dumping them to the checkpointing stream.
3590          */
3591
3592          for(i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++){
3593                 list_for_each(lh, &dev->objectBucket[i].list) {
3594                         if (lh) {
3595                                 obj = list_entry(lh, yaffs_Object, hashLink);
3596                                 if (!obj->deferedFree) {
3597                                         yaffs_ObjectToCheckpointObject(&cp,obj);
3598                                         cp.structType = sizeof(cp);
3599                                         /* printf("Write out object %d type %d\n",obj->objectId,obj->variantType); */
3600                                         ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3601
3602                                         if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
3603                                                 ok = yaffs_WriteCheckpointTnodes(obj);
3604                                         }
3605                                 }
3606                         }
3607                 }
3608          }
3609
3610          /* Dump end of list */
3611         memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
3612         cp.structType = sizeof(cp);
3613
3614         if(ok)
3615                 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3616
3617         return ok ? 1 : 0;
3618 }
3619
3620 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
3621 {
3622         yaffs_Object *obj;
3623         yaffs_CheckpointObject cp;
3624         int ok = 1;
3625         int done = 0;
3626         yaffs_Object *hardList = NULL;
3627
3628         while(ok && !done) {
3629                 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3630                 if(cp.structType != sizeof(cp)) {
3631                         /* printf("structure parsing failed\n"); */
3632                         ok = 0;
3633                 }
3634
3635                 if(ok && cp.objectId == ~0)
3636                         done = 1;
3637                 else if(ok){
3638                         T(YAFFS_TRACE_CHECKPOINT,(TSTR("Read object %d parent %d type %d" TENDSTR),
3639                                 cp.objectId,cp.parentId,cp.variantType));
3640                         obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
3641                         if(obj) {
3642                                 yaffs_CheckpointObjectToObject(obj,&cp);
3643                                 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
3644                                         ok = yaffs_ReadCheckpointTnodes(obj);
3645                                 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
3646                                         obj->hardLinks.next =
3647                                                     (struct list_head *)
3648                                                     hardList;
3649                                         hardList = obj;
3650                                 }
3651
3652                         }
3653                 }
3654         }
3655
3656         if(ok)
3657                 yaffs_HardlinkFixup(dev,hardList);
3658
3659         return ok ? 1 : 0;
3660 }
3661
3662 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
3663 {
3664
3665         int ok;
3666
3667         ok = yaffs_CheckpointOpen(dev,1);
3668
3669         if(ok)
3670                 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
3671         if(ok)
3672                 ok = yaffs_WriteCheckpointDevice(dev);
3673         if(ok)
3674                 ok = yaffs_WriteCheckpointObjects(dev);
3675         if(ok)
3676                 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
3677
3678         if(!yaffs_CheckpointClose(dev))
3679                  ok = 0;
3680
3681         if(ok)
3682                 dev->isCheckpointed = 1;
3683          else
3684                 dev->isCheckpointed = 0;
3685
3686         return dev->isCheckpointed;
3687 }
3688
3689 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
3690 {
3691         int ok;
3692
3693         ok = yaffs_CheckpointOpen(dev,0); /* open for read */
3694
3695         if(ok)
3696                 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
3697         if(ok)
3698                 ok = yaffs_ReadCheckpointDevice(dev);
3699         if(ok)
3700                 ok = yaffs_ReadCheckpointObjects(dev);
3701         if(ok)
3702                 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
3703
3704
3705
3706         if(!yaffs_CheckpointClose(dev))
3707                 ok = 0;
3708
3709         if(ok)
3710                 dev->isCheckpointed = 1;
3711          else
3712                 dev->isCheckpointed = 0;
3713
3714         return ok ? 1 : 0;
3715
3716 }
3717
3718 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
3719 {
3720         if(dev->isCheckpointed ||
3721            dev->blocksInCheckpoint > 0){
3722                 dev->isCheckpointed = 0;
3723                 yaffs_CheckpointInvalidateStream(dev);
3724                 if(dev->superBlock && dev->markSuperBlockDirty)
3725                         dev->markSuperBlockDirty(dev->superBlock);
3726         }
3727 }
3728
3729
3730 int yaffs_CheckpointSave(yaffs_Device *dev)
3731 {
3732         T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
3733
3734         if(!dev->isCheckpointed)
3735                 yaffs_WriteCheckpointData(dev);
3736
3737         T(YAFFS_TRACE_CHECKPOINT,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
3738
3739         return dev->isCheckpointed;
3740 }
3741
3742 int yaffs_CheckpointRestore(yaffs_Device *dev)
3743 {
3744         int retval;
3745         T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
3746
3747         retval = yaffs_ReadCheckpointData(dev);
3748
3749         T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
3750
3751         return retval;
3752 }
3753
3754 /*--------------------- File read/write ------------------------
3755  * Read and write have very similar structures.
3756  * In general the read/write has three parts to it
3757  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3758  * Some complete chunks
3759  * An incomplete chunk to end off with
3760  *
3761  * Curve-balls: the first chunk might also be the last chunk.
3762  */
3763
3764 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, __u32 offset,
3765                            int nBytes)
3766 {
3767
3768         int chunk;
3769         int start;
3770         int nToCopy;
3771         int n = nBytes;
3772         int nDone = 0;
3773         yaffs_ChunkCache *cache;
3774
3775         yaffs_Device *dev;
3776
3777         dev = in->myDev;
3778
3779         while (n > 0) {
3780                 chunk = offset / dev->nBytesPerChunk + 1;   /* The first chunk is 1 */
3781                 start = offset % dev->nBytesPerChunk;
3782
3783                 /* OK now check for the curveball where the start and end are in
3784                  * the same chunk.
3785                  */
3786                 if ((start + n) < dev->nBytesPerChunk) {
3787                         nToCopy = n;
3788                 } else {
3789                         nToCopy = dev->nBytesPerChunk - start;
3790                 }
3791
3792                 cache = yaffs_FindChunkCache(in, chunk);
3793
3794                 /* If the chunk is already in the cache or it is less than a whole chunk
3795                  * then use the cache (if there is caching)
3796                  * else bypass the cache.
3797                  */
3798                 if (cache || nToCopy != dev->nBytesPerChunk) {
3799                         if (dev->nShortOpCaches > 0) {
3800
3801                                 /* If we can't find the data in the cache, then load it up. */
3802
3803                                 if (!cache) {
3804                                         cache = yaffs_GrabChunkCache(in->myDev);
3805                                         cache->object = in;
3806                                         cache->chunkId = chunk;
3807                                         cache->dirty = 0;
3808                                         cache->locked = 0;
3809                                         yaffs_ReadChunkDataFromObject(in, chunk,
3810                                                                       cache->
3811                                                                       data);
3812                                         cache->nBytes = 0;
3813                                 }
3814
3815                                 yaffs_UseChunkCache(dev, cache, 0);
3816
3817                                 cache->locked = 1;
3818
3819 #ifdef CONFIG_YAFFS_WINCE
3820                                 yfsd_UnlockYAFFS(TRUE);
3821 #endif
3822                                 memcpy(buffer, &cache->data[start], nToCopy);
3823
3824 #ifdef CONFIG_YAFFS_WINCE
3825                                 yfsd_LockYAFFS(TRUE);
3826 #endif
3827                                 cache->locked = 0;
3828                         } else {
3829                                 /* Read into the local buffer then copy..*/
3830
3831                                 __u8 *localBuffer =
3832                                     yaffs_GetTempBuffer(dev, __LINE__);
3833                                 yaffs_ReadChunkDataFromObject(in, chunk,
3834                                                               localBuffer);
3835 #ifdef CONFIG_YAFFS_WINCE
3836                                 yfsd_UnlockYAFFS(TRUE);
3837 #endif
3838                                 memcpy(buffer, &localBuffer[start], nToCopy);
3839
3840 #ifdef CONFIG_YAFFS_WINCE
3841                                 yfsd_LockYAFFS(TRUE);
3842 #endif
3843                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
3844                                                         __LINE__);
3845                         }
3846
3847                 } else {
3848 #ifdef CONFIG_YAFFS_WINCE
3849                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3850
3851                         /* Under WinCE can't do direct transfer. Need to use a local buffer.
3852                          * This is because we otherwise screw up WinCE's memory mapper
3853                          */
3854                         yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
3855
3856 #ifdef CONFIG_YAFFS_WINCE
3857                         yfsd_UnlockYAFFS(TRUE);
3858 #endif
3859                         memcpy(buffer, localBuffer, dev->nBytesPerChunk);
3860
3861 #ifdef CONFIG_YAFFS_WINCE
3862                         yfsd_LockYAFFS(TRUE);
3863                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3864 #endif
3865
3866 #else
3867                         /* A full chunk. Read directly into the supplied buffer. */
3868                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
3869 #endif
3870                 }
3871
3872                 n -= nToCopy;
3873                 offset += nToCopy;
3874                 buffer += nToCopy;
3875                 nDone += nToCopy;
3876
3877         }
3878
3879         return nDone;
3880 }
3881
3882 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, __u32 offset,
3883                           int nBytes, int writeThrough)
3884 {
3885
3886         int chunk;
3887         int start;
3888         int nToCopy;
3889         int n = nBytes;
3890         int nDone = 0;
3891         int nToWriteBack;
3892         int startOfWrite = offset;
3893         int chunkWritten = 0;
3894         int nBytesRead;
3895
3896         yaffs_Device *dev;
3897
3898         dev = in->myDev;
3899
3900         while (n > 0 && chunkWritten >= 0) {
3901                 chunk = offset / dev->nBytesPerChunk + 1;
3902                 start = offset % dev->nBytesPerChunk;
3903
3904                 /* OK now check for the curveball where the start and end are in
3905                  * the same chunk.
3906                  */
3907
3908                 if ((start + n) < dev->nBytesPerChunk) {
3909                         nToCopy = n;
3910
3911                         /* Now folks, to calculate how many bytes to write back....
3912                          * If we're overwriting and not writing to then end of file then
3913                          * we need to write back as much as was there before.
3914                          */
3915
3916                         nBytesRead =
3917                             in->variant.fileVariant.fileSize -
3918                             ((chunk - 1) * dev->nBytesPerChunk);
3919
3920                         if (nBytesRead > dev->nBytesPerChunk) {
3921                                 nBytesRead = dev->nBytesPerChunk;
3922                         }
3923
3924                         nToWriteBack =
3925                             (nBytesRead >
3926                              (start + n)) ? nBytesRead : (start + n);
3927
3928                 } else {
3929                         nToCopy = dev->nBytesPerChunk - start;
3930                         nToWriteBack = dev->nBytesPerChunk;
3931                 }
3932
3933                 if (nToCopy != dev->nBytesPerChunk) {
3934                         /* An incomplete start or end chunk (or maybe both start and end chunk) */
3935                         if (dev->nShortOpCaches > 0) {
3936                                 yaffs_ChunkCache *cache;
3937                                 /* If we can't find the data in the cache, then load the cache */
3938                                 cache = yaffs_FindChunkCache(in, chunk);
3939
3940                                 if (!cache
3941                                     && yaffs_CheckSpaceForAllocation(in->
3942                                                                      myDev)) {
3943                                         cache = yaffs_GrabChunkCache(in->myDev);
3944                                         cache->object = in;
3945                                         cache->chunkId = chunk;
3946                                         cache->dirty = 0;
3947                                         cache->locked = 0;
3948                                         yaffs_ReadChunkDataFromObject(in, chunk,
3949                                                                       cache->
3950                                                                       data);
3951                                 }
3952                                 else if(cache &&
3953                                         !cache->dirty &&
3954                                         !yaffs_CheckSpaceForAllocation(in->myDev)){
3955                                         /* Drop the cache if it was a read cache item and
3956                                          * no space check has been made for it.
3957                                          */
3958                                          cache = NULL;
3959                                 }
3960
3961                                 if (cache) {
3962                                         yaffs_UseChunkCache(dev, cache, 1);
3963                                         cache->locked = 1;
3964 #ifdef CONFIG_YAFFS_WINCE
3965                                         yfsd_UnlockYAFFS(TRUE);
3966 #endif
3967
3968                                         memcpy(&cache->data[start], buffer,
3969                                                nToCopy);
3970
3971 #ifdef CONFIG_YAFFS_WINCE
3972                                         yfsd_LockYAFFS(TRUE);
3973 #endif
3974                                         cache->locked = 0;
3975                                         cache->nBytes = nToWriteBack;
3976
3977                                         if (writeThrough) {
3978                                                 chunkWritten =
3979                                                     yaffs_WriteChunkDataToObject
3980                                                     (cache->object,
3981                                                      cache->chunkId,
3982                                                      cache->data, cache->nBytes,
3983                                                      1);
3984                                                 cache->dirty = 0;
3985                                         }
3986
3987                                 } else {
3988                                         chunkWritten = -1;      /* fail the write */
3989                                 }
3990                         } else {
3991                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
3992                                  * Read into the local buffer then copy, then copy over and write back.
3993                                  */
3994
3995                                 __u8 *localBuffer =
3996                                     yaffs_GetTempBuffer(dev, __LINE__);
3997
3998                                 yaffs_ReadChunkDataFromObject(in, chunk,
3999                                                               localBuffer);
4000
4001 #ifdef CONFIG_YAFFS_WINCE
4002                                 yfsd_UnlockYAFFS(TRUE);
4003 #endif
4004
4005                                 memcpy(&localBuffer[start], buffer, nToCopy);
4006
4007 #ifdef CONFIG_YAFFS_WINCE
4008                                 yfsd_LockYAFFS(TRUE);
4009 #endif
4010                                 chunkWritten =
4011                                     yaffs_WriteChunkDataToObject(in, chunk,
4012                                                                  localBuffer,
4013                                                                  nToWriteBack,
4014                                                                  0);
4015
4016                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4017                                                         __LINE__);
4018
4019                         }
4020
4021                 } else {
4022
4023 #ifdef CONFIG_YAFFS_WINCE
4024                         /* Under WinCE can't do direct transfer. Need to use a local buffer.
4025                          * This is because we otherwise screw up WinCE's memory mapper
4026                          */
4027                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4028 #ifdef CONFIG_YAFFS_WINCE
4029                         yfsd_UnlockYAFFS(TRUE);
4030 #endif
4031                         memcpy(localBuffer, buffer, dev->nBytesPerChunk);
4032 #ifdef CONFIG_YAFFS_WINCE
4033                         yfsd_LockYAFFS(TRUE);
4034 #endif
4035                         chunkWritten =
4036                             yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
4037                                                          dev->nBytesPerChunk,
4038                                                          0);
4039                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4040 #else
4041                         /* A full chunk. Write directly from the supplied buffer. */
4042                         chunkWritten =
4043                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
4044                                                          dev->nBytesPerChunk,
4045                                                          0);
4046 #endif
4047                         /* Since we've overwritten the cached data, we better invalidate it. */
4048                         yaffs_InvalidateChunkCache(in, chunk);
4049                 }
4050
4051                 if (chunkWritten >= 0) {
4052                         n -= nToCopy;
4053                         offset += nToCopy;
4054                         buffer += nToCopy;
4055                         nDone += nToCopy;
4056                 }
4057
4058         }
4059
4060         /* Update file object */
4061
4062         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
4063                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4064         }
4065
4066         in->dirty = 1;
4067
4068         return nDone;
4069 }
4070
4071
4072 /* ---------------------- File resizing stuff ------------------ */
4073
4074 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
4075 {
4076
4077         yaffs_Device *dev = in->myDev;
4078         int oldFileSize = in->variant.fileVariant.fileSize;
4079
4080         int lastDel = 1 + (oldFileSize - 1) / dev->nBytesPerChunk;
4081
4082         int startDel = 1 + (newSize + dev->nBytesPerChunk - 1) /
4083             dev->nBytesPerChunk;
4084         int i;
4085         int chunkId;
4086
4087         /* Delete backwards so that we don't end up with holes if
4088          * power is lost part-way through the operation.
4089          */
4090         for (i = lastDel; i >= startDel; i--) {
4091                 /* NB this could be optimised somewhat,
4092                  * eg. could retrieve the tags and write them without
4093                  * using yaffs_DeleteChunk
4094                  */
4095
4096                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4097                 if (chunkId > 0) {
4098                         if (chunkId <
4099                             (dev->internalStartBlock * dev->nChunksPerBlock)
4100                             || chunkId >=
4101                             ((dev->internalEndBlock +
4102                               1) * dev->nChunksPerBlock)) {
4103                                 T(YAFFS_TRACE_ALWAYS,
4104                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
4105                                    chunkId, i));
4106                         } else {
4107                                 in->nDataChunks--;
4108                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4109                         }
4110                 }
4111         }
4112
4113 }
4114
4115 int yaffs_ResizeFile(yaffs_Object * in, int newSize)
4116 {
4117
4118         int oldFileSize = in->variant.fileVariant.fileSize;
4119         int sizeOfPartialChunk;
4120         yaffs_Device *dev = in->myDev;
4121
4122         sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
4123
4124         yaffs_FlushFilesChunkCache(in);
4125         yaffs_InvalidateWholeChunkCache(in);
4126
4127         yaffs_CheckGarbageCollection(dev);
4128
4129         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
4130                 return yaffs_GetFileSize(in);
4131         }
4132
4133         if (newSize == oldFileSize) {
4134                 return oldFileSize;
4135         }
4136
4137         if (newSize < oldFileSize) {
4138
4139                 yaffs_PruneResizedChunks(in, newSize);
4140
4141                 if (sizeOfPartialChunk != 0) {
4142                         int lastChunk = 1 + newSize / dev->nBytesPerChunk;
4143                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4144
4145                         /* Got to read and rewrite the last chunk with its new size and zero pad */
4146                         yaffs_ReadChunkDataFromObject(in, lastChunk,
4147                                                       localBuffer);
4148
4149                         memset(localBuffer + sizeOfPartialChunk, 0,
4150                                dev->nBytesPerChunk - sizeOfPartialChunk);
4151
4152                         yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
4153                                                      sizeOfPartialChunk, 1);
4154
4155                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4156                 }
4157
4158                 in->variant.fileVariant.fileSize = newSize;
4159
4160                 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
4161         }
4162         /* Write a new object header.
4163          * show we've shrunk the file, if need be
4164          * Do this only if the file is not in the deleted directories.
4165          */
4166         if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
4167             in->parent->objectId != YAFFS_OBJECTID_DELETED) {
4168                 yaffs_UpdateObjectHeader(in, NULL, 0,
4169                                          (newSize < oldFileSize) ? 1 : 0, 0);
4170         }
4171
4172         return newSize;
4173 }
4174
4175 loff_t yaffs_GetFileSize(yaffs_Object * obj)
4176 {
4177         obj = yaffs_GetEquivalentObject(obj);
4178
4179         switch (obj->variantType) {
4180         case YAFFS_OBJECT_TYPE_FILE:
4181                 return obj->variant.fileVariant.fileSize;
4182         case YAFFS_OBJECT_TYPE_SYMLINK:
4183                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
4184         default:
4185                 return 0;
4186         }
4187 }
4188
4189
4190
4191 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
4192 {
4193         int retVal;
4194         if (in->dirty) {
4195                 yaffs_FlushFilesChunkCache(in);
4196                 if (updateTime) {
4197 #ifdef CONFIG_YAFFS_WINCE
4198                         yfsd_WinFileTimeNow(in->win_mtime);
4199 #else
4200
4201                         in->yst_mtime = Y_CURRENT_TIME;
4202
4203 #endif
4204                 }
4205
4206                 retVal =
4207                     (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
4208                      0) ? YAFFS_OK : YAFFS_FAIL;
4209         } else {
4210                 retVal = YAFFS_OK;
4211         }
4212
4213         return retVal;
4214
4215 }
4216
4217 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
4218 {
4219
4220         /* First off, invalidate the file's data in the cache, without flushing. */
4221         yaffs_InvalidateWholeChunkCache(in);
4222
4223         if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
4224                 /* Move to the unlinked directory so we have a record that it was deleted. */
4225                 yaffs_ChangeObjectName(in, in->myDev->deletedDir, NULL, 0, 0);
4226
4227         }
4228
4229         yaffs_RemoveObjectFromDirectory(in);
4230         yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
4231         in->chunkId = -1;
4232
4233         yaffs_FreeObject(in);
4234         return YAFFS_OK;
4235
4236 }
4237
4238 /* yaffs_DeleteFile deletes the whole file data
4239  * and the inode associated with the file.
4240  * It does not delete the links associated with the file.
4241  */
4242 static int yaffs_UnlinkFile(yaffs_Object * in)
4243 {
4244
4245         int retVal;
4246         int immediateDeletion = 0;
4247
4248         if (1) {
4249 #ifdef __KERNEL__
4250                 if (!in->myInode) {
4251                         immediateDeletion = 1;
4252
4253                 }
4254 #else
4255                 if (in->inUse <= 0) {
4256                         immediateDeletion = 1;
4257
4258                 }
4259 #endif
4260                 if (immediateDeletion) {
4261                         retVal =
4262                             yaffs_ChangeObjectName(in, in->myDev->deletedDir,
4263                                                    NULL, 0, 0);
4264                         T(YAFFS_TRACE_TRACING,
4265                           (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
4266                            in->objectId));
4267                         in->deleted = 1;
4268                         in->myDev->nDeletedFiles++;
4269                         if (0 && in->myDev->isYaffs2) {
4270                                 yaffs_ResizeFile(in, 0);
4271                         }
4272                         yaffs_SoftDeleteFile(in);
4273                 } else {
4274                         retVal =
4275                             yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
4276                                                    NULL, 0, 0);
4277                 }
4278
4279         }
4280         return retVal;
4281 }
4282
4283 int yaffs_DeleteFile(yaffs_Object * in)
4284 {
4285         int retVal = YAFFS_OK;
4286
4287         if (in->nDataChunks > 0) {
4288                 /* Use soft deletion if there is data in the file */
4289                 if (!in->unlinked) {
4290                         retVal = yaffs_UnlinkFile(in);
4291                 }
4292                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
4293                         in->deleted = 1;
4294                         in->myDev->nDeletedFiles++;
4295                         yaffs_SoftDeleteFile(in);
4296                 }
4297                 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
4298         } else {
4299                 /* The file has no data chunks so we toss it immediately */
4300                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
4301                 in->variant.fileVariant.top = NULL;
4302                 yaffs_DoGenericObjectDeletion(in);
4303
4304                 return YAFFS_OK;
4305         }
4306 }
4307
4308 static int yaffs_DeleteDirectory(yaffs_Object * in)
4309 {
4310         /* First check that the directory is empty. */
4311         if (list_empty(&in->variant.directoryVariant.children)) {
4312                 return yaffs_DoGenericObjectDeletion(in);
4313         }
4314
4315         return YAFFS_FAIL;
4316
4317 }
4318
4319 static int yaffs_DeleteSymLink(yaffs_Object * in)
4320 {
4321         YFREE(in->variant.symLinkVariant.alias);
4322
4323         return yaffs_DoGenericObjectDeletion(in);
4324 }
4325
4326 static int yaffs_DeleteHardLink(yaffs_Object * in)
4327 {
4328         /* remove this hardlink from the list assocaited with the equivalent
4329          * object
4330          */
4331         list_del(&in->hardLinks);
4332         return yaffs_DoGenericObjectDeletion(in);
4333 }
4334
4335 static void yaffs_DestroyObject(yaffs_Object * obj)
4336 {
4337         switch (obj->variantType) {
4338         case YAFFS_OBJECT_TYPE_FILE:
4339                 yaffs_DeleteFile(obj);
4340                 break;
4341         case YAFFS_OBJECT_TYPE_DIRECTORY:
4342                 yaffs_DeleteDirectory(obj);
4343                 break;
4344         case YAFFS_OBJECT_TYPE_SYMLINK:
4345                 yaffs_DeleteSymLink(obj);
4346                 break;
4347         case YAFFS_OBJECT_TYPE_HARDLINK:
4348                 yaffs_DeleteHardLink(obj);
4349                 break;
4350         case YAFFS_OBJECT_TYPE_SPECIAL:
4351                 yaffs_DoGenericObjectDeletion(obj);
4352                 break;
4353         case YAFFS_OBJECT_TYPE_UNKNOWN:
4354                 break;          /* should not happen. */
4355         }
4356 }
4357
4358 static int yaffs_UnlinkWorker(yaffs_Object * obj)
4359 {
4360
4361         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4362                 return yaffs_DeleteHardLink(obj);
4363         } else if (!list_empty(&obj->hardLinks)) {
4364                 /* Curve ball: We're unlinking an object that has a hardlink.
4365                  *
4366                  * This problem arises because we are not strictly following
4367                  * The Linux link/inode model.
4368                  *
4369                  * We can't really delete the object.
4370                  * Instead, we do the following:
4371                  * - Select a hardlink.
4372                  * - Unhook it from the hard links
4373                  * - Unhook it from its parent directory (so that the rename can work)
4374                  * - Rename the object to the hardlink's name.
4375                  * - Delete the hardlink
4376                  */
4377
4378                 yaffs_Object *hl;
4379                 int retVal;
4380                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
4381
4382                 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
4383
4384                 list_del_init(&hl->hardLinks);
4385                 list_del_init(&hl->siblings);
4386
4387                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
4388
4389                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
4390
4391                 if (retVal == YAFFS_OK) {
4392                         retVal = yaffs_DoGenericObjectDeletion(hl);
4393                 }
4394                 return retVal;
4395
4396         } else {
4397                 switch (obj->variantType) {
4398                 case YAFFS_OBJECT_TYPE_FILE:
4399                         return yaffs_UnlinkFile(obj);
4400                         break;
4401                 case YAFFS_OBJECT_TYPE_DIRECTORY:
4402                         return yaffs_DeleteDirectory(obj);
4403                         break;
4404                 case YAFFS_OBJECT_TYPE_SYMLINK:
4405                         return yaffs_DeleteSymLink(obj);
4406                         break;
4407                 case YAFFS_OBJECT_TYPE_SPECIAL:
4408                         return yaffs_DoGenericObjectDeletion(obj);
4409                         break;
4410                 case YAFFS_OBJECT_TYPE_HARDLINK:
4411                 case YAFFS_OBJECT_TYPE_UNKNOWN:
4412                 default:
4413                         return YAFFS_FAIL;
4414                 }
4415         }
4416 }
4417
4418
4419 static int yaffs_UnlinkObject( yaffs_Object *obj)
4420 {
4421
4422         if (obj && obj->unlinkAllowed) {
4423                 return yaffs_UnlinkWorker(obj);
4424         }
4425
4426         return YAFFS_FAIL;
4427
4428 }
4429 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
4430 {
4431         yaffs_Object *obj;
4432
4433         obj = yaffs_FindObjectByName(dir, name);
4434         return yaffs_UnlinkObject(obj);
4435 }
4436
4437 /*----------------------- Initialisation Scanning ---------------------- */
4438
4439 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
4440                                        int backwardScanning)
4441 {
4442         yaffs_Object *obj;
4443
4444         if (!backwardScanning) {
4445                 /* Handle YAFFS1 forward scanning case
4446                  * For YAFFS1 we always do the deletion
4447                  */
4448
4449         } else {
4450                 /* Handle YAFFS2 case (backward scanning)
4451                  * If the shadowed object exists then ignore.
4452                  */
4453                 if (yaffs_FindObjectByNumber(dev, objId)) {
4454                         return;
4455                 }
4456         }
4457
4458         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
4459          * We put it in unlinked dir to be cleaned up after the scanning
4460          */
4461         obj =
4462             yaffs_FindOrCreateObjectByNumber(dev, objId,
4463                                              YAFFS_OBJECT_TYPE_FILE);
4464         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
4465         obj->variant.fileVariant.shrinkSize = 0;
4466         obj->valid = 1;         /* So that we don't read any other info for this file */
4467
4468 }
4469
4470 typedef struct {
4471         int seq;
4472         int block;
4473 } yaffs_BlockIndex;
4474
4475
4476 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
4477 {
4478         yaffs_Object *hl;
4479         yaffs_Object *in;
4480
4481         while (hardList) {
4482                 hl = hardList;
4483                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
4484
4485                 in = yaffs_FindObjectByNumber(dev,
4486                                               hl->variant.hardLinkVariant.
4487                                               equivalentObjectId);
4488
4489                 if (in) {
4490                         /* Add the hardlink pointers */
4491                         hl->variant.hardLinkVariant.equivalentObject = in;
4492                         list_add(&hl->hardLinks, &in->hardLinks);
4493                 } else {
4494                         /* Todo Need to report/handle this better.
4495                          * Got a problem... hardlink to a non-existant object
4496                          */
4497                         hl->variant.hardLinkVariant.equivalentObject = NULL;
4498                         INIT_LIST_HEAD(&hl->hardLinks);
4499
4500                 }
4501
4502         }
4503
4504 }
4505
4506
4507
4508
4509
4510 static int ybicmp(const void *a, const void *b){
4511     register int aseq = ((yaffs_BlockIndex *)a)->seq;
4512     register int bseq = ((yaffs_BlockIndex *)b)->seq;
4513     register int ablock = ((yaffs_BlockIndex *)a)->block;
4514     register int bblock = ((yaffs_BlockIndex *)b)->block;
4515     if( aseq == bseq )
4516         return ablock - bblock;
4517     else
4518         return aseq - bseq;
4519
4520 }
4521
4522 static int yaffs_Scan(yaffs_Device * dev)
4523 {
4524         yaffs_ExtendedTags tags;
4525         int blk;
4526         int blockIterator;
4527         int startIterator;
4528         int endIterator;
4529         int nBlocksToScan = 0;
4530
4531         int chunk;
4532         int c;
4533         int deleted;
4534         yaffs_BlockState state;
4535         yaffs_Object *hardList = NULL;
4536         yaffs_Object *hl;
4537         yaffs_BlockInfo *bi;
4538         int sequenceNumber;
4539         yaffs_ObjectHeader *oh;
4540         yaffs_Object *in;
4541         yaffs_Object *parent;
4542         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4543
4544         __u8 *chunkData;
4545
4546         yaffs_BlockIndex *blockIndex = NULL;
4547
4548         if (dev->isYaffs2) {
4549                 T(YAFFS_TRACE_SCAN,
4550                   (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
4551                 return YAFFS_FAIL;
4552         }
4553
4554         //TODO  Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
4555
4556         T(YAFFS_TRACE_SCAN,
4557           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
4558            dev->internalStartBlock, dev->internalEndBlock));
4559
4560         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4561
4562         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4563
4564         if (dev->isYaffs2) {
4565                 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4566         }
4567
4568         /* Scan all the blocks to determine their state */
4569         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
4570                 bi = yaffs_GetBlockInfo(dev, blk);
4571                 yaffs_ClearChunkBits(dev, blk);
4572                 bi->pagesInUse = 0;
4573                 bi->softDeletions = 0;
4574
4575                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
4576
4577                 bi->blockState = state;
4578                 bi->sequenceNumber = sequenceNumber;
4579
4580                 T(YAFFS_TRACE_SCAN_DEBUG,
4581                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
4582                    state, sequenceNumber));
4583
4584                 if (state == YAFFS_BLOCK_STATE_DEAD) {
4585                         T(YAFFS_TRACE_BAD_BLOCKS,
4586                           (TSTR("block %d is bad" TENDSTR), blk));
4587                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
4588                         T(YAFFS_TRACE_SCAN_DEBUG,
4589                           (TSTR("Block empty " TENDSTR)));
4590                         dev->nErasedBlocks++;
4591                         dev->nFreeChunks += dev->nChunksPerBlock;
4592                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4593
4594                         /* Determine the highest sequence number */
4595                         if (dev->isYaffs2 &&
4596                             sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4597                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
4598
4599                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
4600                                 blockIndex[nBlocksToScan].block = blk;
4601
4602                                 nBlocksToScan++;
4603
4604                                 if (sequenceNumber >= dev->sequenceNumber) {
4605                                         dev->sequenceNumber = sequenceNumber;
4606                                 }
4607                         } else if (dev->isYaffs2) {
4608                                 /* TODO: Nasty sequence number! */
4609                                 T(YAFFS_TRACE_SCAN,
4610                                   (TSTR
4611                                    ("Block scanning block %d has bad sequence number %d"
4612                                     TENDSTR), blk, sequenceNumber));
4613
4614                         }
4615                 }
4616         }
4617
4618         /* Sort the blocks
4619          * Dungy old bubble sort for now...
4620          */
4621         if (dev->isYaffs2) {
4622                 yaffs_BlockIndex temp;
4623                 int i;
4624                 int j;
4625
4626                 for (i = 0; i < nBlocksToScan; i++)
4627                         for (j = i + 1; j < nBlocksToScan; j++)
4628                                 if (blockIndex[i].seq > blockIndex[j].seq) {
4629                                         temp = blockIndex[j];
4630                                         blockIndex[j] = blockIndex[i];
4631                                         blockIndex[i] = temp;
4632                                 }
4633         }
4634
4635         /* Now scan the blocks looking at the data. */
4636         if (dev->isYaffs2) {
4637                 startIterator = 0;
4638                 endIterator = nBlocksToScan - 1;
4639                 T(YAFFS_TRACE_SCAN_DEBUG,
4640                   (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
4641         } else {
4642                 startIterator = dev->internalStartBlock;
4643                 endIterator = dev->internalEndBlock;
4644         }
4645
4646         /* For each block.... */
4647         for (blockIterator = startIterator; blockIterator <= endIterator;
4648              blockIterator++) {
4649
4650                 if (dev->isYaffs2) {
4651                         /* get the block to scan in the correct order */
4652                         blk = blockIndex[blockIterator].block;
4653                 } else {
4654                         blk = blockIterator;
4655                 }
4656
4657                 bi = yaffs_GetBlockInfo(dev, blk);
4658                 state = bi->blockState;
4659
4660                 deleted = 0;
4661
4662                 /* For each chunk in each block that needs scanning....*/
4663                 for (c = 0; c < dev->nChunksPerBlock &&
4664                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
4665                         /* Read the tags and decide what to do */
4666                         chunk = blk * dev->nChunksPerBlock + c;
4667
4668                         yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
4669                                                         &tags);
4670
4671                         /* Let's have a good look at this chunk... */
4672
4673                         if (!dev->isYaffs2 && tags.chunkDeleted) {
4674                                 /* YAFFS1 only...
4675                                  * A deleted chunk
4676                                  */
4677                                 deleted++;
4678                                 dev->nFreeChunks++;
4679                                 /*T((" %d %d deleted\n",blk,c)); */
4680                         } else if (!tags.chunkUsed) {
4681                                 /* An unassigned chunk in the block
4682                                  * This means that either the block is empty or
4683                                  * this is the one being allocated from
4684                                  */
4685
4686                                 if (c == 0) {
4687                                         /* We're looking at the first chunk in the block so the block is unused */
4688                                         state = YAFFS_BLOCK_STATE_EMPTY;
4689                                         dev->nErasedBlocks++;
4690                                 } else {
4691                                         /* this is the block being allocated from */
4692                                         T(YAFFS_TRACE_SCAN,
4693                                           (TSTR
4694                                            (" Allocating from %d %d" TENDSTR),
4695                                            blk, c));
4696                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
4697                                         dev->allocationBlock = blk;
4698                                         dev->allocationPage = c;
4699                                         dev->allocationBlockFinder = blk;
4700                                         /* Set it to here to encourage the allocator to go forth from here. */
4701
4702                                         /* Yaffs2 sanity check:
4703                                          * This should be the one with the highest sequence number
4704                                          */
4705                                         if (dev->isYaffs2
4706                                             && (dev->sequenceNumber !=
4707                                                 bi->sequenceNumber)) {
4708                                                 T(YAFFS_TRACE_ALWAYS,
4709                                                   (TSTR
4710                                                    ("yaffs: Allocation block %d was not highest sequence id:"
4711                                                     " block seq = %d, dev seq = %d"
4712                                                     TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
4713                                         }
4714                                 }
4715
4716                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4717                         } else if (tags.chunkId > 0) {
4718                                 /* chunkId > 0 so it is a data chunk... */
4719                                 unsigned int endpos;
4720
4721                                 yaffs_SetChunkBit(dev, blk, c);
4722                                 bi->pagesInUse++;
4723
4724                                 in = yaffs_FindOrCreateObjectByNumber(dev,
4725                                                                       tags.
4726                                                                       objectId,
4727                                                                       YAFFS_OBJECT_TYPE_FILE);
4728                                 /* PutChunkIntoFile checks for a clash (two data chunks with
4729                                  * the same chunkId).
4730                                  */
4731                                 yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,
4732                                                        1);
4733                                 endpos =
4734                                     (tags.chunkId - 1) * dev->nBytesPerChunk +
4735                                     tags.byteCount;
4736                                 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
4737                                     && in->variant.fileVariant.scannedFileSize <
4738                                     endpos) {
4739                                         in->variant.fileVariant.
4740                                             scannedFileSize = endpos;
4741                                         if (!dev->useHeaderFileSize) {
4742                                                 in->variant.fileVariant.
4743                                                     fileSize =
4744                                                     in->variant.fileVariant.
4745                                                     scannedFileSize;
4746                                         }
4747
4748                                 }
4749                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
4750                         } else {
4751                                 /* chunkId == 0, so it is an ObjectHeader.
4752                                  * Thus, we read in the object header and make the object
4753                                  */
4754                                 yaffs_SetChunkBit(dev, blk, c);
4755                                 bi->pagesInUse++;
4756
4757                                 yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
4758                                                                 chunkData,
4759                                                                 NULL);
4760
4761                                 oh = (yaffs_ObjectHeader *) chunkData;
4762
4763                                 in = yaffs_FindObjectByNumber(dev,
4764                                                               tags.objectId);
4765                                 if (in && in->variantType != oh->type) {
4766                                         /* This should not happen, but somehow
4767                                          * Wev'e ended up with an objectId that has been reused but not yet
4768                                          * deleted, and worse still it has changed type. Delete the old object.
4769                                          */
4770
4771                                         yaffs_DestroyObject(in);
4772
4773                                         in = 0;
4774                                 }
4775
4776                                 in = yaffs_FindOrCreateObjectByNumber(dev,
4777                                                                       tags.
4778                                                                       objectId,
4779                                                                       oh->type);
4780
4781                                 if (oh->shadowsObject > 0) {
4782                                         yaffs_HandleShadowedObject(dev,
4783                                                                    oh->
4784                                                                    shadowsObject,
4785                                                                    0);
4786                                 }
4787
4788                                 if (in->valid) {
4789                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
4790
4791                                         unsigned existingSerial = in->serial;
4792                                         unsigned newSerial = tags.serialNumber;
4793
4794                                         if (dev->isYaffs2 ||
4795                                             ((existingSerial + 1) & 3) ==
4796                                             newSerial) {
4797                                                 /* Use new one - destroy the exisiting one */
4798                                                 yaffs_DeleteChunk(dev,
4799                                                                   in->chunkId,
4800                                                                   1, __LINE__);
4801                                                 in->valid = 0;
4802                                         } else {
4803                                                 /* Use existing - destroy this one. */
4804                                                 yaffs_DeleteChunk(dev, chunk, 1,
4805                                                                   __LINE__);
4806                                         }
4807                                 }
4808
4809                                 if (!in->valid &&
4810                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
4811                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
4812                                         /* We only load some info, don't fiddle with directory structure */
4813                                         in->valid = 1;
4814                                         in->variantType = oh->type;
4815
4816                                         in->yst_mode = oh->yst_mode;
4817 #ifdef CONFIG_YAFFS_WINCE
4818                                         in->win_atime[0] = oh->win_atime[0];
4819                                         in->win_ctime[0] = oh->win_ctime[0];
4820                                         in->win_mtime[0] = oh->win_mtime[0];
4821                                         in->win_atime[1] = oh->win_atime[1];
4822                                         in->win_ctime[1] = oh->win_ctime[1];
4823                                         in->win_mtime[1] = oh->win_mtime[1];
4824 #else
4825                                         in->yst_uid = oh->yst_uid;
4826                                         in->yst_gid = oh->yst_gid;
4827                                         in->yst_atime = oh->yst_atime;
4828                                         in->yst_mtime = oh->yst_mtime;
4829                                         in->yst_ctime = oh->yst_ctime;
4830                                         in->yst_rdev = oh->yst_rdev;
4831 #endif
4832                                         in->chunkId = chunk;
4833
4834                                 } else if (!in->valid) {
4835                                         /* we need to load this info */
4836
4837                                         in->valid = 1;
4838                                         in->variantType = oh->type;
4839
4840                                         in->yst_mode = oh->yst_mode;
4841 #ifdef CONFIG_YAFFS_WINCE
4842                                         in->win_atime[0] = oh->win_atime[0];
4843                                         in->win_ctime[0] = oh->win_ctime[0];
4844                                         in->win_mtime[0] = oh->win_mtime[0];
4845                                         in->win_atime[1] = oh->win_atime[1];
4846                                         in->win_ctime[1] = oh->win_ctime[1];
4847                                         in->win_mtime[1] = oh->win_mtime[1];
4848 #else
4849                                         in->yst_uid = oh->yst_uid;
4850                                         in->yst_gid = oh->yst_gid;
4851                                         in->yst_atime = oh->yst_atime;
4852                                         in->yst_mtime = oh->yst_mtime;
4853                                         in->yst_ctime = oh->yst_ctime;
4854                                         in->yst_rdev = oh->yst_rdev;
4855 #endif
4856                                         in->chunkId = chunk;
4857
4858                                         yaffs_SetObjectName(in, oh->name);
4859                                         in->dirty = 0;
4860
4861                                         /* directory stuff...
4862                                          * hook up to parent
4863                                          */
4864
4865                                         parent =
4866                                             yaffs_FindOrCreateObjectByNumber
4867                                             (dev, oh->parentObjectId,
4868                                              YAFFS_OBJECT_TYPE_DIRECTORY);
4869                                         if (parent->variantType ==
4870                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
4871                                                 /* Set up as a directory */
4872                                                 parent->variantType =
4873                                                     YAFFS_OBJECT_TYPE_DIRECTORY;
4874                                                 INIT_LIST_HEAD(&parent->variant.
4875                                                                directoryVariant.
4876                                                                children);
4877                                         } else if (parent->variantType !=
4878                                                    YAFFS_OBJECT_TYPE_DIRECTORY)
4879                                         {
4880                                                 /* Hoosterman, another problem....
4881                                                  * We're trying to use a non-directory as a directory
4882                                                  */
4883
4884                                                 T(YAFFS_TRACE_ERROR,
4885                                                   (TSTR
4886                                                    ("yaffs tragedy: attempting to use non-directory as"
4887                                                     " a directory in scan. Put in lost+found."
4888                                                     TENDSTR)));
4889                                                 parent = dev->lostNFoundDir;
4890                                         }
4891
4892                                         yaffs_AddObjectToDirectory(parent, in);
4893
4894                                         if (0 && (parent == dev->deletedDir ||
4895                                                   parent == dev->unlinkedDir)) {
4896                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
4897                                                 dev->nDeletedFiles++;
4898                                         }
4899                                         /* Note re hardlinks.
4900                                          * Since we might scan a hardlink before its equivalent object is scanned
4901                                          * we put them all in a list.
4902                                          * After scanning is complete, we should have all the objects, so we run through this
4903                                          * list and fix up all the chains.
4904                                          */
4905
4906                                         switch (in->variantType) {
4907                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
4908                                                 /* Todo got a problem */
4909                                                 break;
4910                                         case YAFFS_OBJECT_TYPE_FILE:
4911                                                 if (dev->isYaffs2
4912                                                     && oh->isShrink) {
4913                                                         /* Prune back the shrunken chunks */
4914                                                         yaffs_PruneResizedChunks
4915                                                             (in, oh->fileSize);
4916                                                         /* Mark the block as having a shrinkHeader */
4917                                                         bi->hasShrinkHeader = 1;
4918                                                 }
4919
4920                                                 if (dev->useHeaderFileSize)
4921
4922                                                         in->variant.fileVariant.
4923                                                             fileSize =
4924                                                             oh->fileSize;
4925
4926                                                 break;
4927                                         case YAFFS_OBJECT_TYPE_HARDLINK:
4928                                                 in->variant.hardLinkVariant.
4929                                                     equivalentObjectId =
4930                                                     oh->equivalentObjectId;
4931                                                 in->hardLinks.next =
4932                                                     (struct list_head *)
4933                                                     hardList;
4934                                                 hardList = in;
4935                                                 break;
4936                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
4937                                                 /* Do nothing */
4938                                                 break;
4939                                         case YAFFS_OBJECT_TYPE_SPECIAL:
4940                                                 /* Do nothing */
4941                                                 break;
4942                                         case YAFFS_OBJECT_TYPE_SYMLINK:
4943                                                 in->variant.symLinkVariant.
4944                                                     alias =
4945                                                     yaffs_CloneString(oh->alias);
4946                                                 break;
4947                                         }
4948
4949                                         if (parent == dev->deletedDir) {
4950                                                 yaffs_DestroyObject(in);
4951                                                 bi->hasShrinkHeader = 1;
4952                                         }
4953                                 }
4954                         }
4955                 }
4956
4957                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4958                         /* If we got this far while scanning, then the block is fully allocated.*/
4959                         state = YAFFS_BLOCK_STATE_FULL;
4960                 }
4961
4962                 bi->blockState = state;
4963
4964                 /* Now let's see if it was dirty */
4965                 if (bi->pagesInUse == 0 &&
4966                     !bi->hasShrinkHeader &&
4967                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
4968                         yaffs_BlockBecameDirty(dev, blk);
4969                 }
4970
4971         }
4972
4973         if (blockIndex) {
4974                 YFREE(blockIndex);
4975         }
4976
4977
4978         /* Ok, we've done all the scanning.
4979          * Fix up the hard link chains.
4980          * We should now have scanned all the objects, now it's time to add these
4981          * hardlinks.
4982          */
4983
4984         yaffs_HardlinkFixup(dev,hardList);
4985
4986         /* Handle the unlinked files. Since they were left in an unlinked state we should
4987          * just delete them.
4988          */
4989         {
4990                 struct list_head *i;
4991                 struct list_head *n;
4992
4993                 yaffs_Object *l;
4994                 /* Soft delete all the unlinked files */
4995                 list_for_each_safe(i, n,
4996                                    &dev->unlinkedDir->variant.directoryVariant.
4997                                    children) {
4998                         if (i) {
4999                                 l = list_entry(i, yaffs_Object, siblings);
5000                                 yaffs_DestroyObject(l);
5001                         }
5002                 }
5003         }
5004
5005         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5006
5007         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5008
5009         return YAFFS_OK;
5010 }
5011
5012 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5013 {
5014         __u8 *chunkData;
5015         yaffs_ObjectHeader *oh;
5016         yaffs_Device *dev = in->myDev;
5017
5018         if(in->lazyLoaded){
5019                 in->lazyLoaded = 0;
5020                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5021
5022                 yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,NULL);
5023                 oh = (yaffs_ObjectHeader *) chunkData;
5024
5025                 in->yst_mode = oh->yst_mode;
5026 #ifdef CONFIG_YAFFS_WINCE
5027                 in->win_atime[0] = oh->win_atime[0];
5028                 in->win_ctime[0] = oh->win_ctime[0];
5029                 in->win_mtime[0] = oh->win_mtime[0];
5030                 in->win_atime[1] = oh->win_atime[1];
5031                 in->win_ctime[1] = oh->win_ctime[1];
5032                 in->win_mtime[1] = oh->win_mtime[1];
5033 #else
5034                 in->yst_uid = oh->yst_uid;
5035                 in->yst_gid = oh->yst_gid;
5036                 in->yst_atime = oh->yst_atime;
5037                 in->yst_mtime = oh->yst_mtime;
5038                 in->yst_ctime = oh->yst_ctime;
5039                 in->yst_rdev = oh->yst_rdev;
5040
5041 #endif
5042                 yaffs_SetObjectName(in, oh->name);
5043
5044                 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
5045                          in->variant.symLinkVariant.alias =
5046                                                     yaffs_CloneString(oh->alias);
5047
5048                 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
5049         }
5050 }
5051
5052 static int yaffs_ScanBackwards(yaffs_Device * dev)
5053 {
5054         yaffs_ExtendedTags tags;
5055         int blk;
5056         int blockIterator;
5057         int startIterator;
5058         int endIterator;
5059         int nBlocksToScan = 0;
5060
5061         int chunk;
5062         int c;
5063         int deleted;
5064         yaffs_BlockState state;
5065         yaffs_Object *hardList = NULL;
5066         yaffs_BlockInfo *bi;
5067         int sequenceNumber;
5068         yaffs_ObjectHeader *oh;
5069         yaffs_Object *in;
5070         yaffs_Object *parent;
5071         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5072         int itsUnlinked;
5073         __u8 *chunkData;
5074
5075         int fileSize;
5076         int isShrink;
5077         int foundChunksInBlock;
5078         int equivalentObjectId;
5079
5080
5081         yaffs_BlockIndex *blockIndex = NULL;
5082         int altBlockIndex = 0;
5083
5084         if (!dev->isYaffs2) {
5085                 T(YAFFS_TRACE_SCAN,
5086                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5087                 return YAFFS_FAIL;
5088         }
5089
5090         T(YAFFS_TRACE_SCAN,
5091           (TSTR
5092            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
5093             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5094
5095
5096         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5097
5098         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5099
5100         if(!blockIndex) {
5101                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
5102                 altBlockIndex = 1;
5103         }
5104
5105         if(!blockIndex) {
5106                 T(YAFFS_TRACE_SCAN,
5107                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
5108                 return YAFFS_FAIL;
5109         }
5110
5111         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5112
5113         /* Scan all the blocks to determine their state */
5114         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5115                 bi = yaffs_GetBlockInfo(dev, blk);
5116                 yaffs_ClearChunkBits(dev, blk);
5117                 bi->pagesInUse = 0;
5118                 bi->softDeletions = 0;
5119
5120                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5121
5122                 bi->blockState = state;
5123                 bi->sequenceNumber = sequenceNumber;
5124
5125                 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
5126                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
5127
5128                 T(YAFFS_TRACE_SCAN_DEBUG,
5129                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5130                    state, sequenceNumber));
5131
5132
5133                 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
5134                         /* todo .. fix free space ? */
5135
5136                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
5137                         T(YAFFS_TRACE_BAD_BLOCKS,
5138                           (TSTR("block %d is bad" TENDSTR), blk));
5139                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5140                         T(YAFFS_TRACE_SCAN_DEBUG,
5141                           (TSTR("Block empty " TENDSTR)));
5142                         dev->nErasedBlocks++;
5143                         dev->nFreeChunks += dev->nChunksPerBlock;
5144                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5145
5146                         /* Determine the highest sequence number */
5147                         if (dev->isYaffs2 &&
5148                             sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5149                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5150
5151                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
5152                                 blockIndex[nBlocksToScan].block = blk;
5153
5154                                 nBlocksToScan++;
5155
5156                                 if (sequenceNumber >= dev->sequenceNumber) {
5157                                         dev->sequenceNumber = sequenceNumber;
5158                                 }
5159                         } else if (dev->isYaffs2) {
5160                                 /* TODO: Nasty sequence number! */
5161                                 T(YAFFS_TRACE_SCAN,
5162                                   (TSTR
5163                                    ("Block scanning block %d has bad sequence number %d"
5164                                     TENDSTR), blk, sequenceNumber));
5165
5166                         }
5167                 }
5168         }
5169
5170         T(YAFFS_TRACE_SCAN,
5171         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
5172
5173
5174
5175         YYIELD();
5176
5177         /* Sort the blocks */
5178 #ifndef CONFIG_YAFFS_USE_OWN_SORT
5179         {
5180                 /* Use qsort now. */
5181                 qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
5182         }
5183 #else
5184         {
5185                 /* Dungy old bubble sort... */
5186
5187                 yaffs_BlockIndex temp;
5188                 int i;
5189                 int j;
5190
5191                 for (i = 0; i < nBlocksToScan; i++)
5192                         for (j = i + 1; j < nBlocksToScan; j++)
5193                                 if (blockIndex[i].seq > blockIndex[j].seq) {
5194                                         temp = blockIndex[j];
5195                                         blockIndex[j] = blockIndex[i];
5196                                         blockIndex[i] = temp;
5197                                 }
5198         }
5199 #endif
5200
5201         YYIELD();
5202
5203         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
5204
5205         /* Now scan the blocks looking at the data. */
5206         startIterator = 0;
5207         endIterator = nBlocksToScan - 1;
5208         T(YAFFS_TRACE_SCAN_DEBUG,
5209           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5210
5211         /* For each block.... backwards */
5212         for (blockIterator = endIterator; blockIterator >= startIterator;
5213              blockIterator--) {
5214                 /* Cooperative multitasking! This loop can run for so
5215                    long that watchdog timers expire. */
5216                 YYIELD();
5217
5218                 /* get the block to scan in the correct order */
5219                 blk = blockIndex[blockIterator].block;
5220
5221                 bi = yaffs_GetBlockInfo(dev, blk);
5222                 state = bi->blockState;
5223
5224                 deleted = 0;
5225
5226                 /* For each chunk in each block that needs scanning.... */
5227                 foundChunksInBlock = 0;
5228                 for (c = dev->nChunksPerBlock - 1; c >= 0 &&
5229                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
5230                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
5231                         /* Scan backwards...
5232                          * Read the tags and decide what to do
5233                          */
5234                         chunk = blk * dev->nChunksPerBlock + c;
5235
5236                         yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5237                                                         &tags);
5238
5239                         /* Let's have a good look at this chunk... */
5240
5241                         if (!tags.chunkUsed) {
5242                                 /* An unassigned chunk in the block.
5243                                  * If there are used chunks after this one, then
5244                                  * it is a chunk that was skipped due to failing the erased
5245                                  * check. Just skip it so that it can be deleted.
5246                                  * But, more typically, We get here when this is an unallocated
5247                                  * chunk and his means that either the block is empty or
5248                                  * this is the one being allocated from
5249                                  */
5250
5251                                 if(foundChunksInBlock)
5252                                 {
5253                                         /* This is a chunk that was skipped due to failing the erased check */
5254
5255                                 } else if (c == 0) {
5256                                         /* We're looking at the first chunk in the block so the block is unused */
5257                                         state = YAFFS_BLOCK_STATE_EMPTY;
5258                                         dev->nErasedBlocks++;
5259                                 } else {
5260                                         /* this is the block being allocated from */
5261                                         if (state ==
5262                                             YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5263                                                 T(YAFFS_TRACE_SCAN,
5264                                                   (TSTR
5265                                                    (" Allocating from %d %d"
5266                                                     TENDSTR), blk, c));
5267                                         }
5268                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5269                                         dev->allocationBlock = blk;
5270                                         dev->allocationPage = c;
5271                                         dev->allocationBlockFinder = blk;
5272                                         /* Set it to here to encourage the allocator to
5273                                          *  go forth from here.
5274                                          */
5275
5276                                         /* Yaffs2 sanity check:
5277                                          * This should be the one with the highest sequence number
5278                                          */
5279                                         if (dev->isYaffs2
5280                                             && (dev->sequenceNumber !=
5281                                                 bi->sequenceNumber)) {
5282                                                 T(YAFFS_TRACE_ALWAYS,
5283                                                   (TSTR
5284                                                    ("yaffs: Allocation block %d was not highest sequence "
5285                                                     "id: block seq = %d, dev seq = %d"
5286                                                     TENDSTR), blk,
5287                                                    bi->sequenceNumber,
5288                                                    dev->sequenceNumber));
5289                                         }
5290                                 }
5291
5292                                 dev->nFreeChunks++;
5293                         } else if (tags.chunkId > 0) {
5294                                 /* chunkId > 0 so it is a data chunk... */
5295                                 unsigned int endpos;
5296                                 __u32 chunkBase =
5297                                     (tags.chunkId - 1) * dev->nBytesPerChunk;
5298
5299                                 foundChunksInBlock = 1;
5300
5301
5302                                 yaffs_SetChunkBit(dev, blk, c);
5303                                 bi->pagesInUse++;
5304
5305                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5306                                                                       tags.
5307                                                                       objectId,
5308                                                                       YAFFS_OBJECT_TYPE_FILE);
5309                                 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
5310                                     && chunkBase <
5311                                     in->variant.fileVariant.shrinkSize) {
5312                                         /* This has not been invalidated by a resize */
5313                                         yaffs_PutChunkIntoFile(in, tags.chunkId,
5314                                                                chunk, -1);
5315
5316                                         /* File size is calculated by looking at the data chunks if we have not
5317                                          * seen an object header yet. Stop this practice once we find an object header.
5318                                          */
5319                                         endpos =
5320                                             (tags.chunkId -
5321                                              1) * dev->nBytesPerChunk +
5322                                             tags.byteCount;
5323
5324                                         if (!in->valid &&       /* have not got an object header yet */
5325                                             in->variant.fileVariant.
5326                                             scannedFileSize < endpos) {
5327                                                 in->variant.fileVariant.
5328                                                     scannedFileSize = endpos;
5329                                                 in->variant.fileVariant.
5330                                                     fileSize =
5331                                                     in->variant.fileVariant.
5332                                                     scannedFileSize;
5333                                         }
5334
5335                                 } else {
5336                                         /* This chunk has been invalidated by a resize, so delete */
5337                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
5338
5339                                 }
5340                         } else {
5341                                 /* chunkId == 0, so it is an ObjectHeader.
5342                                  * Thus, we read in the object header and make the object
5343                                  */
5344                                 foundChunksInBlock = 1;
5345
5346                                 yaffs_SetChunkBit(dev, blk, c);
5347                                 bi->pagesInUse++;
5348
5349                                 oh = NULL;
5350                                 in = NULL;
5351
5352                                 if (tags.extraHeaderInfoAvailable) {
5353                                         in = yaffs_FindOrCreateObjectByNumber
5354                                             (dev, tags.objectId,
5355                                              tags.extraObjectType);
5356                                 }
5357
5358                                 if (!in ||
5359 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
5360                                     !in->valid ||
5361 #endif
5362                                     tags.extraShadows ||
5363                                     (!in->valid &&
5364                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5365                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
5366                                     ) {
5367
5368                                         /* If we don't have  valid info then we need to read the chunk
5369                                          * TODO In future we can probably defer reading the chunk and
5370                                          * living with invalid data until needed.
5371                                          */
5372
5373                                         yaffs_ReadChunkWithTagsFromNAND(dev,
5374                                                                         chunk,
5375                                                                         chunkData,
5376                                                                         NULL);
5377
5378                                         oh = (yaffs_ObjectHeader *) chunkData;
5379
5380                                         if (!in)
5381                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
5382
5383                                 }
5384
5385                                 if (!in) {
5386                                         /* TODO Hoosterman we have a problem! */
5387                                         T(YAFFS_TRACE_ERROR,
5388                                           (TSTR
5389                                            ("yaffs tragedy: Could not make object for object  %d  "
5390                                             "at chunk %d during scan"
5391                                             TENDSTR), tags.objectId, chunk));
5392
5393                                 }
5394
5395                                 if (in->valid) {
5396                                         /* We have already filled this one.
5397                                          * We have a duplicate that will be discarded, but
5398                                          * we first have to suck out resize info if it is a file.
5399                                          */
5400
5401                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
5402                                              ((oh &&
5403                                                oh-> type == YAFFS_OBJECT_TYPE_FILE)||
5404                                               (tags.extraHeaderInfoAvailable  &&
5405                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
5406                                             ) {
5407                                                 __u32 thisSize =
5408                                                     (oh) ? oh->fileSize : tags.
5409                                                     extraFileLength;
5410                                                 __u32 parentObjectId =
5411                                                     (oh) ? oh->
5412                                                     parentObjectId : tags.
5413                                                     extraParentObjectId;
5414                                                 unsigned isShrink =
5415                                                     (oh) ? oh->isShrink : tags.
5416                                                     extraIsShrinkHeader;
5417
5418                                                 /* If it is deleted (unlinked at start also means deleted)
5419                                                  * we treat the file size as being zeroed at this point.
5420                                                  */
5421                                                 if (parentObjectId ==
5422                                                     YAFFS_OBJECTID_DELETED
5423                                                     || parentObjectId ==
5424                                                     YAFFS_OBJECTID_UNLINKED) {
5425                                                         thisSize = 0;
5426                                                         isShrink = 1;
5427                                                 }
5428
5429                                                 if (isShrink &&
5430                                                     in->variant.fileVariant.
5431                                                     shrinkSize > thisSize) {
5432                                                         in->variant.fileVariant.
5433                                                             shrinkSize =
5434                                                             thisSize;
5435                                                 }
5436
5437                                                 if (isShrink) {
5438                                                         bi->hasShrinkHeader = 1;
5439                                                 }
5440
5441                                         }
5442                                         /* Use existing - destroy this one. */
5443                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
5444
5445                                 }
5446
5447                                 if (!in->valid &&
5448                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5449                                      tags.objectId ==
5450                                      YAFFS_OBJECTID_LOSTNFOUND)) {
5451                                         /* We only load some info, don't fiddle with directory structure */
5452                                         in->valid = 1;
5453
5454                                         if(oh) {
5455                                                 in->variantType = oh->type;
5456
5457                                                 in->yst_mode = oh->yst_mode;
5458 #ifdef CONFIG_YAFFS_WINCE
5459                                                 in->win_atime[0] = oh->win_atime[0];
5460                                                 in->win_ctime[0] = oh->win_ctime[0];
5461                                                 in->win_mtime[0] = oh->win_mtime[0];
5462                                                 in->win_atime[1] = oh->win_atime[1];
5463                                                 in->win_ctime[1] = oh->win_ctime[1];
5464                                                 in->win_mtime[1] = oh->win_mtime[1];
5465 #else
5466                                                 in->yst_uid = oh->yst_uid;
5467                                                 in->yst_gid = oh->yst_gid;
5468                                                 in->yst_atime = oh->yst_atime;
5469                                                 in->yst_mtime = oh->yst_mtime;
5470                                                 in->yst_ctime = oh->yst_ctime;
5471                                                 in->yst_rdev = oh->yst_rdev;
5472
5473 #endif
5474                                         } else {
5475                                                 in->variantType = tags.extraObjectType;
5476                                                 in->lazyLoaded = 1;
5477                                         }
5478
5479                                         in->chunkId = chunk;
5480
5481                                 } else if (!in->valid) {
5482                                         /* we need to load this info */
5483
5484                                         in->valid = 1;
5485                                         in->chunkId = chunk;
5486
5487                                         if(oh) {
5488                                                 in->variantType = oh->type;
5489
5490                                                 in->yst_mode = oh->yst_mode;
5491 #ifdef CONFIG_YAFFS_WINCE
5492                                                 in->win_atime[0] = oh->win_atime[0];
5493                                                 in->win_ctime[0] = oh->win_ctime[0];
5494                                                 in->win_mtime[0] = oh->win_mtime[0];
5495                                                 in->win_atime[1] = oh->win_atime[1];
5496                                                 in->win_ctime[1] = oh->win_ctime[1];
5497                                                 in->win_mtime[1] = oh->win_mtime[1];
5498 #else
5499                                                 in->yst_uid = oh->yst_uid;
5500                                                 in->yst_gid = oh->yst_gid;
5501                                                 in->yst_atime = oh->yst_atime;
5502                                                 in->yst_mtime = oh->yst_mtime;
5503                                                 in->yst_ctime = oh->yst_ctime;
5504                                                 in->yst_rdev = oh->yst_rdev;
5505 #endif
5506
5507                                                 if (oh->shadowsObject > 0)
5508                                                         yaffs_HandleShadowedObject(dev,
5509                                                                            oh->
5510                                                                            shadowsObject,
5511                                                                            1);
5512
5513
5514                                                 yaffs_SetObjectName(in, oh->name);
5515                                                 parent =
5516                                                     yaffs_FindOrCreateObjectByNumber
5517                                                         (dev, oh->parentObjectId,
5518                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
5519
5520                                                  fileSize = oh->fileSize;
5521                                                  isShrink = oh->isShrink;
5522                                                  equivalentObjectId = oh->equivalentObjectId;
5523
5524                                         }
5525                                         else {
5526                                                 in->variantType = tags.extraObjectType;
5527                                                 parent =
5528                                                     yaffs_FindOrCreateObjectByNumber
5529                                                         (dev, tags.extraParentObjectId,
5530                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
5531                                                  fileSize = tags.extraFileLength;
5532                                                  isShrink = tags.extraIsShrinkHeader;
5533                                                  equivalentObjectId = tags.extraEquivalentObjectId;
5534                                                 in->lazyLoaded = 1;
5535
5536                                         }
5537                                         in->dirty = 0;
5538
5539                                         /* directory stuff...
5540                                          * hook up to parent
5541                                          */
5542
5543                                         if (parent->variantType ==
5544                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
5545                                                 /* Set up as a directory */
5546                                                 parent->variantType =
5547                                                     YAFFS_OBJECT_TYPE_DIRECTORY;
5548                                                 INIT_LIST_HEAD(&parent->variant.
5549                                                                directoryVariant.
5550                                                                children);
5551                                         } else if (parent->variantType !=
5552                                                    YAFFS_OBJECT_TYPE_DIRECTORY)
5553                                         {
5554                                                 /* Hoosterman, another problem....
5555                                                  * We're trying to use a non-directory as a directory
5556                                                  */
5557
5558                                                 T(YAFFS_TRACE_ERROR,
5559                                                   (TSTR
5560                                                    ("yaffs tragedy: attempting to use non-directory as"
5561                                                     " a directory in scan. Put in lost+found."
5562                                                     TENDSTR)));
5563                                                 parent = dev->lostNFoundDir;
5564                                         }
5565
5566                                         yaffs_AddObjectToDirectory(parent, in);
5567
5568                                         itsUnlinked = (parent == dev->deletedDir) ||
5569                                                       (parent == dev->unlinkedDir);
5570
5571                                         if (isShrink) {
5572                                                 /* Mark the block as having a shrinkHeader */
5573                                                 bi->hasShrinkHeader = 1;
5574                                         }
5575
5576                                         /* Note re hardlinks.
5577                                          * Since we might scan a hardlink before its equivalent object is scanned
5578                                          * we put them all in a list.
5579                                          * After scanning is complete, we should have all the objects, so we run
5580                                          * through this list and fix up all the chains.
5581                                          */
5582
5583                                         switch (in->variantType) {
5584                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
5585                                                 /* Todo got a problem */
5586                                                 break;
5587                                         case YAFFS_OBJECT_TYPE_FILE:
5588
5589                                                 if (in->variant.fileVariant.
5590                                                     scannedFileSize < fileSize) {
5591                                                         /* This covers the case where the file size is greater
5592                                                          * than where the data is
5593                                                          * This will happen if the file is resized to be larger
5594                                                          * than its current data extents.
5595                                                          */
5596                                                         in->variant.fileVariant.fileSize = fileSize;
5597                                                         in->variant.fileVariant.scannedFileSize =
5598                                                             in->variant.fileVariant.fileSize;
5599                                                 }
5600
5601                                                 if (isShrink &&
5602                                                     in->variant.fileVariant.shrinkSize > fileSize) {
5603                                                         in->variant.fileVariant.shrinkSize = fileSize;
5604                                                 }
5605
5606                                                 break;
5607                                         case YAFFS_OBJECT_TYPE_HARDLINK:
5608                                                 if(!itsUnlinked) {
5609                                                   in->variant.hardLinkVariant.equivalentObjectId =
5610                                                     equivalentObjectId;
5611                                                   in->hardLinks.next =
5612                                                     (struct list_head *) hardList;
5613                                                   hardList = in;
5614                                                 }
5615                                                 break;
5616                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
5617                                                 /* Do nothing */
5618                                                 break;
5619                                         case YAFFS_OBJECT_TYPE_SPECIAL:
5620                                                 /* Do nothing */
5621                                                 break;
5622                                         case YAFFS_OBJECT_TYPE_SYMLINK:
5623                                                 if(oh)
5624                                                    in->variant.symLinkVariant.alias =
5625                                                     yaffs_CloneString(oh->
5626                                                                       alias);
5627                                                 break;
5628                                         }
5629
5630                                 }
5631                         }
5632                 }
5633
5634                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5635                         /* If we got this far while scanning, then the block is fully allocated. */
5636                         state = YAFFS_BLOCK_STATE_FULL;
5637                 }
5638
5639                 bi->blockState = state;
5640
5641                 /* Now let's see if it was dirty */
5642                 if (bi->pagesInUse == 0 &&
5643                     !bi->hasShrinkHeader &&
5644                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5645                         yaffs_BlockBecameDirty(dev, blk);
5646                 }
5647
5648         }
5649
5650         if (altBlockIndex)
5651                 YFREE_ALT(blockIndex);
5652         else
5653                 YFREE(blockIndex);
5654
5655         /* Ok, we've done all the scanning.
5656          * Fix up the hard link chains.
5657          * We should now have scanned all the objects, now it's time to add these
5658          * hardlinks.
5659          */
5660         yaffs_HardlinkFixup(dev,hardList);
5661
5662
5663         /*
5664         *  Sort out state of unlinked and deleted objects.
5665         */
5666         {
5667                 struct list_head *i;
5668                 struct list_head *n;
5669
5670                 yaffs_Object *l;
5671
5672                 /* Soft delete all the unlinked files */
5673                 list_for_each_safe(i, n,
5674                                    &dev->unlinkedDir->variant.directoryVariant.
5675                                    children) {
5676                         if (i) {
5677                                 l = list_entry(i, yaffs_Object, siblings);
5678                                 yaffs_DestroyObject(l);
5679                         }
5680                 }
5681
5682                 /* Soft delete all the deletedDir files */
5683                 list_for_each_safe(i, n,
5684                                    &dev->deletedDir->variant.directoryVariant.
5685                                    children) {
5686                         if (i) {
5687                                 l = list_entry(i, yaffs_Object, siblings);
5688                                 yaffs_DestroyObject(l);
5689
5690                         }
5691                 }
5692         }
5693
5694         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5695
5696         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
5697
5698         return YAFFS_OK;
5699 }
5700
5701 /*------------------------------  Directory Functions ----------------------------- */
5702
5703 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
5704 {
5705         yaffs_Device *dev = obj->myDev;
5706
5707         if(dev && dev->removeObjectCallback)
5708                 dev->removeObjectCallback(obj);
5709
5710         list_del_init(&obj->siblings);
5711         obj->parent = NULL;
5712 }
5713
5714
5715 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
5716                                        yaffs_Object * obj)
5717 {
5718
5719         if (!directory) {
5720                 T(YAFFS_TRACE_ALWAYS,
5721                   (TSTR
5722                    ("tragedy: Trying to add an object to a null pointer directory"
5723                     TENDSTR)));
5724                 YBUG();
5725         }
5726         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5727                 T(YAFFS_TRACE_ALWAYS,
5728                   (TSTR
5729                    ("tragedy: Trying to add an object to a non-directory"
5730                     TENDSTR)));
5731                 YBUG();
5732         }
5733
5734         if (obj->siblings.prev == NULL) {
5735                 /* Not initialised */
5736                 INIT_LIST_HEAD(&obj->siblings);
5737
5738         } else if (!list_empty(&obj->siblings)) {
5739                 /* If it is holed up somewhere else, un hook it */
5740                 yaffs_RemoveObjectFromDirectory(obj);
5741         }
5742         /* Now add it */
5743         list_add(&obj->siblings, &directory->variant.directoryVariant.children);
5744         obj->parent = directory;
5745
5746         if (directory == obj->myDev->unlinkedDir
5747             || directory == obj->myDev->deletedDir) {
5748                 obj->unlinked = 1;
5749                 obj->myDev->nUnlinkedFiles++;
5750                 obj->renameAllowed = 0;
5751         }
5752 }
5753
5754 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
5755                                      const YCHAR * name)
5756 {
5757         int sum;
5758
5759         struct list_head *i;
5760         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
5761
5762         yaffs_Object *l;
5763
5764         if (!name) {
5765                 return NULL;
5766         }
5767
5768         if (!directory) {
5769                 T(YAFFS_TRACE_ALWAYS,
5770                   (TSTR
5771                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
5772                     TENDSTR)));
5773                 YBUG();
5774         }
5775         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5776                 T(YAFFS_TRACE_ALWAYS,
5777                   (TSTR
5778                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5779                 YBUG();
5780         }
5781
5782         sum = yaffs_CalcNameSum(name);
5783
5784         list_for_each(i, &directory->variant.directoryVariant.children) {
5785                 if (i) {
5786                         l = list_entry(i, yaffs_Object, siblings);
5787
5788                         yaffs_CheckObjectDetailsLoaded(l);
5789
5790                         /* Special case for lost-n-found */
5791                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5792                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
5793                                         return l;
5794                                 }
5795                         } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
5796                         {
5797                                 /* LostnFound cunk called Objxxx
5798                                  * Do a real check
5799                                  */
5800                                 yaffs_GetObjectName(l, buffer,
5801                                                     YAFFS_MAX_NAME_LENGTH);
5802                                 if (yaffs_strcmp(name, buffer) == 0) {
5803                                         return l;
5804                                 }
5805
5806                         }
5807                 }
5808         }
5809
5810         return NULL;
5811 }
5812
5813
5814 #if 0
5815 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
5816                                    int (*fn) (yaffs_Object *))
5817 {
5818         struct list_head *i;
5819         yaffs_Object *l;
5820
5821         if (!theDir) {
5822                 T(YAFFS_TRACE_ALWAYS,
5823                   (TSTR
5824                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
5825                     TENDSTR)));
5826                 YBUG();
5827         }
5828         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5829                 T(YAFFS_TRACE_ALWAYS,
5830                   (TSTR
5831                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5832                 YBUG();
5833         }
5834
5835         list_for_each(i, &theDir->variant.directoryVariant.children) {
5836                 if (i) {
5837                         l = list_entry(i, yaffs_Object, siblings);
5838                         if (l && !fn(l)) {
5839                                 return YAFFS_FAIL;
5840                         }
5841                 }
5842         }
5843
5844         return YAFFS_OK;
5845
5846 }
5847 #endif
5848
5849 /* GetEquivalentObject dereferences any hard links to get to the
5850  * actual object.
5851  */
5852
5853 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
5854 {
5855         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5856                 /* We want the object id of the equivalent object, not this one */
5857                 obj = obj->variant.hardLinkVariant.equivalentObject;
5858         }
5859         return obj;
5860
5861 }
5862
5863 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
5864 {
5865         memset(name, 0, buffSize * sizeof(YCHAR));
5866
5867         yaffs_CheckObjectDetailsLoaded(obj);
5868
5869         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5870                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
5871         } else if (obj->chunkId <= 0) {
5872                 YCHAR locName[20];
5873                 /* make up a name */
5874                 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
5875                               obj->objectId);
5876                 yaffs_strncpy(name, locName, buffSize - 1);
5877
5878         }
5879 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
5880         else if (obj->shortName[0]) {
5881                 yaffs_strcpy(name, obj->shortName);
5882         }
5883 #endif
5884         else {
5885                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
5886
5887                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
5888
5889                 memset(buffer, 0, obj->myDev->nBytesPerChunk);
5890
5891                 if (obj->chunkId >= 0) {
5892                         yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
5893                                                         obj->chunkId, buffer,
5894                                                         NULL);
5895                 }
5896                 yaffs_strncpy(name, oh->name, buffSize - 1);
5897
5898                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
5899         }
5900
5901         return yaffs_strlen(name);
5902 }
5903
5904 int yaffs_GetObjectFileLength(yaffs_Object * obj)
5905 {
5906
5907         /* Dereference any hard linking */
5908         obj = yaffs_GetEquivalentObject(obj);
5909
5910         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
5911                 return obj->variant.fileVariant.fileSize;
5912         }
5913         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5914                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5915         } else {
5916                 /* Only a directory should drop through to here */
5917                 return obj->myDev->nBytesPerChunk;
5918         }
5919 }
5920
5921 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
5922 {
5923         int count = 0;
5924         struct list_head *i;
5925
5926         if (!obj->unlinked) {
5927                 count++;        /* the object itself */
5928         }
5929         list_for_each(i, &obj->hardLinks) {
5930                 count++;        /* add the hard links; */
5931         }
5932         return count;
5933
5934 }
5935
5936 int yaffs_GetObjectInode(yaffs_Object * obj)
5937 {
5938         obj = yaffs_GetEquivalentObject(obj);
5939
5940         return obj->objectId;
5941 }
5942
5943 unsigned yaffs_GetObjectType(yaffs_Object * obj)
5944 {
5945         obj = yaffs_GetEquivalentObject(obj);
5946
5947         switch (obj->variantType) {
5948         case YAFFS_OBJECT_TYPE_FILE:
5949                 return DT_REG;
5950                 break;
5951         case YAFFS_OBJECT_TYPE_DIRECTORY:
5952                 return DT_DIR;
5953                 break;
5954         case YAFFS_OBJECT_TYPE_SYMLINK:
5955                 return DT_LNK;
5956                 break;
5957         case YAFFS_OBJECT_TYPE_HARDLINK:
5958                 return DT_REG;
5959                 break;
5960         case YAFFS_OBJECT_TYPE_SPECIAL:
5961                 if (S_ISFIFO(obj->yst_mode))
5962                         return DT_FIFO;
5963                 if (S_ISCHR(obj->yst_mode))
5964                         return DT_CHR;
5965                 if (S_ISBLK(obj->yst_mode))
5966                         return DT_BLK;
5967                 if (S_ISSOCK(obj->yst_mode))
5968                         return DT_SOCK;
5969         default:
5970                 return DT_REG;
5971                 break;
5972         }
5973 }
5974
5975 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
5976 {
5977         obj = yaffs_GetEquivalentObject(obj);
5978         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5979                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
5980         } else {
5981                 return yaffs_CloneString(_Y(""));
5982         }
5983 }
5984
5985 #ifndef CONFIG_YAFFS_WINCE
5986
5987 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
5988 {
5989         unsigned int valid = attr->ia_valid;
5990
5991         if (valid & ATTR_MODE)
5992                 obj->yst_mode = attr->ia_mode;
5993         if (valid & ATTR_UID)
5994                 obj->yst_uid = attr->ia_uid;
5995         if (valid & ATTR_GID)
5996                 obj->yst_gid = attr->ia_gid;
5997
5998         if (valid & ATTR_ATIME)
5999                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
6000         if (valid & ATTR_CTIME)
6001                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
6002         if (valid & ATTR_MTIME)
6003                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
6004
6005         if (valid & ATTR_SIZE)
6006                 yaffs_ResizeFile(obj, attr->ia_size);
6007
6008         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6009
6010         return YAFFS_OK;
6011
6012 }
6013 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
6014 {
6015         unsigned int valid = 0;
6016
6017         attr->ia_mode = obj->yst_mode;
6018         valid |= ATTR_MODE;
6019         attr->ia_uid = obj->yst_uid;
6020         valid |= ATTR_UID;
6021         attr->ia_gid = obj->yst_gid;
6022         valid |= ATTR_GID;
6023
6024         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
6025         valid |= ATTR_ATIME;
6026         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
6027         valid |= ATTR_CTIME;
6028         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
6029         valid |= ATTR_MTIME;
6030
6031         attr->ia_size = yaffs_GetFileSize(obj);
6032         valid |= ATTR_SIZE;
6033
6034         attr->ia_valid = valid;
6035
6036         return YAFFS_OK;
6037
6038 }
6039
6040 #endif
6041
6042 #if 0
6043 int yaffs_DumpObject(yaffs_Object * obj)
6044 {
6045         YCHAR name[257];
6046
6047         yaffs_GetObjectName(obj, name, 256);
6048
6049         T(YAFFS_TRACE_ALWAYS,
6050           (TSTR
6051            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
6052             " chunk %d type %d size %d\n"
6053             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
6054            obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
6055            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
6056
6057         return YAFFS_OK;
6058 }
6059 #endif
6060
6061 /*---------------------------- Initialisation code -------------------------------------- */
6062
6063 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
6064 {
6065
6066         /* Common functions, gotta have */
6067         if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
6068                 return 0;
6069
6070 #ifdef CONFIG_YAFFS_YAFFS2
6071
6072         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
6073         if (dev->writeChunkWithTagsToNAND &&
6074             dev->readChunkWithTagsFromNAND &&
6075             !dev->writeChunkToNAND &&
6076             !dev->readChunkFromNAND &&
6077             dev->markNANDBlockBad && dev->queryNANDBlock)
6078                 return 1;
6079 #endif
6080
6081         /* Can use the "spare" style interface for yaffs1 */
6082         if (!dev->isYaffs2 &&
6083             !dev->writeChunkWithTagsToNAND &&
6084             !dev->readChunkWithTagsFromNAND &&
6085             dev->writeChunkToNAND &&
6086             dev->readChunkFromNAND &&
6087             !dev->markNANDBlockBad && !dev->queryNANDBlock)
6088                 return 1;
6089
6090         return 0;               /* bad */
6091 }
6092
6093
6094 static void yaffs_CreateInitialDirectories(yaffs_Device *dev)
6095 {
6096         /* Initialise the unlinked, deleted, root and lost and found directories */
6097
6098         dev->lostNFoundDir = dev->rootDir =  NULL;
6099         dev->unlinkedDir = dev->deletedDir = NULL;
6100
6101         dev->unlinkedDir =
6102             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
6103         dev->deletedDir =
6104             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
6105
6106         dev->rootDir =
6107             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
6108                                       YAFFS_ROOT_MODE | S_IFDIR);
6109         dev->lostNFoundDir =
6110             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
6111                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
6112         yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
6113 }
6114
6115 int yaffs_GutsInitialise(yaffs_Device * dev)
6116 {
6117         unsigned x;
6118         int bits;
6119         int extraBits;
6120
6121         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
6122
6123         /* Check stuff that must be set */
6124
6125         if (!dev) {
6126                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
6127                 return YAFFS_FAIL;
6128         }
6129
6130         dev->internalStartBlock = dev->startBlock;
6131         dev->internalEndBlock = dev->endBlock;
6132         dev->blockOffset = 0;
6133         dev->chunkOffset = 0;
6134         dev->nFreeChunks = 0;
6135
6136         if (dev->startBlock == 0) {
6137                 dev->internalStartBlock = dev->startBlock + 1;
6138                 dev->internalEndBlock = dev->endBlock + 1;
6139                 dev->blockOffset = 1;
6140                 dev->chunkOffset = dev->nChunksPerBlock;
6141         }
6142
6143         /* Check geometry parameters. */
6144
6145         if ((dev->isYaffs2 && dev->nBytesPerChunk < 1024) ||
6146             (!dev->isYaffs2 && dev->nBytesPerChunk != 512) ||
6147              dev->nChunksPerBlock < 2 ||
6148              dev->nReservedBlocks < 2 ||
6149              dev->internalStartBlock <= 0 ||
6150              dev->internalEndBlock <= 0 ||
6151              dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)      // otherwise it is too small
6152             ) {
6153                 T(YAFFS_TRACE_ALWAYS,
6154                   (TSTR
6155                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
6156                     TENDSTR), dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
6157                 return YAFFS_FAIL;
6158         }
6159
6160         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
6161                 T(YAFFS_TRACE_ALWAYS,
6162                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
6163                 return YAFFS_FAIL;
6164         }
6165
6166         /* Got the right mix of functions? */
6167         if (!yaffs_CheckDevFunctions(dev)) {
6168                 /* Function missing */
6169                 T(YAFFS_TRACE_ALWAYS,
6170                   (TSTR
6171                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
6172
6173                 return YAFFS_FAIL;
6174         }
6175
6176         /* This is really a compilation check. */
6177         if (!yaffs_CheckStructures()) {
6178                 T(YAFFS_TRACE_ALWAYS,
6179                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
6180                 return YAFFS_FAIL;
6181         }
6182
6183         if (dev->isMounted) {
6184                 T(YAFFS_TRACE_ALWAYS,
6185                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
6186                 return YAFFS_FAIL;
6187         }
6188
6189         /* Finished with most checks. One or two more checks happen later on too. */
6190
6191         dev->isMounted = 1;
6192
6193
6194
6195         /* OK now calculate a few things for the device
6196          * Calculate chunkGroupBits.
6197          * We need to find the next power of 2 > than internalEndBlock
6198          */
6199
6200         x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
6201
6202         for (bits = extraBits = 0; x > 1; bits++) {
6203                 if (x & 1)
6204                         extraBits++;
6205                 x >>= 1;
6206         }
6207
6208         if (extraBits > 0)
6209                 bits++;
6210
6211         /* Set up tnode width if wide tnodes are enabled. */
6212         if(!dev->wideTnodesDisabled){
6213                 /* bits must be even so that we end up with 32-bit words */
6214                 if(bits & 1)
6215                         bits++;
6216                 if(bits < 16)
6217                         dev->tnodeWidth = 16;
6218                 else
6219                         dev->tnodeWidth = bits;
6220         }
6221         else
6222                 dev->tnodeWidth = 16;
6223
6224         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
6225
6226         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
6227          * so if the bitwidth of the
6228          * chunk range we're using is greater than 16 we need
6229          * to figure out chunk shift and chunkGroupSize
6230          */
6231
6232         if (bits <= dev->tnodeWidth)
6233                 dev->chunkGroupBits = 0;
6234         else
6235                 dev->chunkGroupBits = bits - dev->tnodeWidth;
6236
6237
6238         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
6239
6240         if (dev->nChunksPerBlock < dev->chunkGroupSize) {
6241                 /* We have a problem because the soft delete won't work if
6242                  * the chunk group size > chunks per block.
6243                  * This can be remedied by using larger "virtual blocks".
6244                  */
6245                 T(YAFFS_TRACE_ALWAYS,
6246                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
6247
6248                 return YAFFS_FAIL;
6249         }
6250
6251         /* OK, we've finished verifying the device, lets continue with initialisation */
6252
6253         /* More device initialisation */
6254         dev->garbageCollections = 0;
6255         dev->passiveGarbageCollections = 0;
6256         dev->currentDirtyChecker = 0;
6257         dev->bufferedBlock = -1;
6258         dev->doingBufferedBlockRewrite = 0;
6259         dev->nDeletedFiles = 0;
6260         dev->nBackgroundDeletions = 0;
6261         dev->nUnlinkedFiles = 0;
6262         dev->eccFixed = 0;
6263         dev->eccUnfixed = 0;
6264         dev->tagsEccFixed = 0;
6265         dev->tagsEccUnfixed = 0;
6266         dev->nErasureFailures = 0;
6267         dev->nErasedBlocks = 0;
6268         dev->isDoingGC = 0;
6269
6270         /* Initialise temporary buffers and caches. */
6271         {
6272                 int i;
6273                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
6274                         dev->tempBuffer[i].line = 0;    /* not in use */
6275                         dev->tempBuffer[i].buffer =
6276                             YMALLOC_DMA(dev->nBytesPerChunk);
6277                 }
6278         }
6279
6280         if (dev->nShortOpCaches > 0) {
6281                 int i;
6282
6283                 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
6284                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
6285                 }
6286
6287                 dev->srCache =
6288                     YMALLOC(dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
6289
6290                 for (i = 0; i < dev->nShortOpCaches; i++) {
6291                         dev->srCache[i].object = NULL;
6292                         dev->srCache[i].lastUse = 0;
6293                         dev->srCache[i].dirty = 0;
6294                         dev->srCache[i].data = YMALLOC_DMA(dev->nBytesPerChunk);
6295                 }
6296                 dev->srLastUse = 0;
6297         }
6298
6299         dev->cacheHits = 0;
6300
6301         dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
6302
6303         if (dev->isYaffs2) {
6304                 dev->useHeaderFileSize = 1;
6305         }
6306
6307         yaffs_InitialiseBlocks(dev);
6308         yaffs_InitialiseTnodes(dev);
6309         yaffs_InitialiseObjects(dev);
6310
6311         yaffs_CreateInitialDirectories(dev);
6312
6313
6314         /* Now scan the flash. */
6315         if (dev->isYaffs2) {
6316                 if(yaffs_CheckpointRestore(dev)) {
6317                         T(YAFFS_TRACE_ALWAYS,
6318                           (TSTR("yaffs: restored from checkpoint" TENDSTR)));
6319                 } else {
6320
6321                         /* Clean up the mess caused by an aborted checkpoint load
6322                          * and scan backwards.
6323                          */
6324                         yaffs_DeinitialiseBlocks(dev);
6325                         yaffs_DeinitialiseTnodes(dev);
6326                         yaffs_DeinitialiseObjects(dev);
6327                         yaffs_InitialiseBlocks(dev);
6328                         yaffs_InitialiseTnodes(dev);
6329                         yaffs_InitialiseObjects(dev);
6330                         yaffs_CreateInitialDirectories(dev);
6331
6332                         yaffs_ScanBackwards(dev);
6333                 }
6334         }else
6335                 yaffs_Scan(dev);
6336
6337         /* Zero out stats */
6338         dev->nPageReads = 0;
6339         dev->nPageWrites = 0;
6340         dev->nBlockErasures = 0;
6341         dev->nGCCopies = 0;
6342         dev->nRetriedWrites = 0;
6343
6344         dev->nRetiredBlocks = 0;
6345
6346         yaffs_VerifyFreeChunks(dev);
6347
6348         T(YAFFS_TRACE_TRACING,
6349           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
6350         return YAFFS_OK;
6351
6352 }
6353
6354 void yaffs_Deinitialise(yaffs_Device * dev)
6355 {
6356         if (dev->isMounted) {
6357                 int i;
6358
6359                 yaffs_DeinitialiseBlocks(dev);
6360                 yaffs_DeinitialiseTnodes(dev);
6361                 yaffs_DeinitialiseObjects(dev);
6362                 if (dev->nShortOpCaches > 0) {
6363
6364                         for (i = 0; i < dev->nShortOpCaches; i++) {
6365                                 YFREE(dev->srCache[i].data);
6366                         }
6367
6368                         YFREE(dev->srCache);
6369                 }
6370
6371                 YFREE(dev->gcCleanupList);
6372
6373                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
6374                         YFREE(dev->tempBuffer[i].buffer);
6375                 }
6376
6377                 dev->isMounted = 0;
6378         }
6379
6380 }
6381
6382 static int yaffs_CountFreeChunks(yaffs_Device * dev)
6383 {
6384         int nFree;
6385         int b;
6386
6387         yaffs_BlockInfo *blk;
6388
6389         for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
6390              b++) {
6391                 blk = yaffs_GetBlockInfo(dev, b);
6392
6393                 switch (blk->blockState) {
6394                 case YAFFS_BLOCK_STATE_EMPTY:
6395                 case YAFFS_BLOCK_STATE_ALLOCATING:
6396                 case YAFFS_BLOCK_STATE_COLLECTING:
6397                 case YAFFS_BLOCK_STATE_FULL:
6398                         nFree +=
6399                             (dev->nChunksPerBlock - blk->pagesInUse +
6400                              blk->softDeletions);
6401                         break;
6402                 default:
6403                         break;
6404                 }
6405
6406         }
6407
6408         return nFree;
6409 }
6410
6411 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
6412 {
6413         /* This is what we report to the outside world */
6414
6415         int nFree;
6416         int nDirtyCacheChunks;
6417         int blocksForCheckpoint;
6418
6419 #if 1
6420         nFree = dev->nFreeChunks;
6421 #else
6422         nFree = yaffs_CountFreeChunks(dev);
6423 #endif
6424
6425         nFree += dev->nDeletedFiles;
6426
6427         /* Now count the number of dirty chunks in the cache and subtract those */
6428
6429         {
6430                 int i;
6431                 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
6432                         if (dev->srCache[i].dirty)
6433                                 nDirtyCacheChunks++;
6434                 }
6435         }
6436
6437         nFree -= nDirtyCacheChunks;
6438
6439         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
6440
6441         /* Now we figure out how much to reserve for the checkpoint and report that... */
6442         blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
6443         if(blocksForCheckpoint < 0)
6444                 blocksForCheckpoint = 0;
6445
6446         nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
6447
6448         if (nFree < 0)
6449                 nFree = 0;
6450
6451         return nFree;
6452
6453 }
6454
6455 static int yaffs_freeVerificationFailures;
6456
6457 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
6458 {
6459         int counted = yaffs_CountFreeChunks(dev);
6460
6461         int difference = dev->nFreeChunks - counted;
6462
6463         if (difference) {
6464                 T(YAFFS_TRACE_ALWAYS,
6465                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
6466                    dev->nFreeChunks, counted, difference));
6467                 yaffs_freeVerificationFailures++;
6468         }
6469 }
6470
6471 /*---------------------------------------- YAFFS test code ----------------------*/
6472
6473 #define yaffs_CheckStruct(structure,syze, name) \
6474            if(sizeof(structure) != syze) \
6475                { \
6476                  T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
6477                  name,syze,sizeof(structure))); \
6478                  return YAFFS_FAIL; \
6479                 }
6480
6481 static int yaffs_CheckStructures(void)
6482 {
6483 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
6484 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
6485 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
6486 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
6487         yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
6488 #endif
6489             yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
6490
6491             return YAFFS_OK;
6492 }