yaffs_guts.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 const char *yaffs_guts_c_version =
  15     "$Id: yaffs_guts.c,v 1.91 2009-10-15 00:45:46 charles Exp $";
  16
  17 #include "yportenv.h"
  18
  19 #include "yaffsinterface.h"
  20 #include "yaffs_guts.h"
  21 #include "yaffs_tagsvalidity.h"
  22 #include "yaffs_getblockinfo.h"
  23
  24 #include "yaffs_tagscompat.h"
  25 #ifndef CONFIG_YAFFS_USE_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 #include "yaffs_packedtags2.h"
  34
  35
  36 #define YAFFS_PASSIVE_GC_CHUNKS 2
  37
  38 #include "yaffs_ecc.h"
  39
  40
  41 /* Robustification (if it ever comes about...) */
  42 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
  43 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
  44                 int erasedOk);
  45 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
  46                                 const __u8 *data,
  47                                 const yaffs_ExtendedTags *tags);
  48 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
  49                                 const yaffs_ExtendedTags *tags);
  50
  51 /* Other local prototypes */
  52 static void yaffs_UpdateParent(yaffs_Object *obj);
  53 static int yaffs_UnlinkObject(yaffs_Object *obj);
  54 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
  55
  56 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
  57
  58 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
  59                                         const __u8 *buffer,
  60                                         yaffs_ExtendedTags *tags,
  61                                         int useReserve);
  62 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
  63                                 int chunkInNAND, int inScan);
  64
  65 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
  66                                         yaffs_ObjectType type);
  67 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
  68                                 yaffs_Object *obj);
  69 static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
  70                                 int force, int isShrink, int shadows);
  71 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
  72 static int yaffs_CheckStructures(void);
  73 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
  74                         int chunkOffset, int *limit);
  75 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
  76
  77 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
  78
  79
  80 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
  81                                 int chunkInNAND);
  82
  83 static int yaffs_UnlinkWorker(yaffs_Object *obj);
  84
  85 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
  86                         int chunkInObject);
  87
  88 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
  89                                 yaffs_BlockInfo **blockUsedPtr);
  90
  91 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
  92
  93 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
  94
  95 static void yaffs_VerifyDirectory(yaffs_Object *directory);
  96 #ifdef YAFFS_PARANOID
  97 static int yaffs_CheckFileSanity(yaffs_Object *in);
  98 #else
  99 #define yaffs_CheckFileSanity(in)
 100 #endif
 101
 102 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 103 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 104
 105 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
 106
 107 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
 108                                 yaffs_ExtendedTags *tags);
 109
 110 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
 111                 unsigned pos);
 112 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
 113                                         yaffs_FileStructure *fStruct,
 114                                         __u32 chunkId);
 115
 116
 117 /* Function to calculate chunk and offset */
 118
 119 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
 120                 __u32 *offsetOut)
 121 {
 122         int chunk;
 123         __u32 offset;
 124
 125         chunk  = (__u32)(addr >> dev->chunkShift);
 126
 127         if (dev->chunkDiv == 1) {
 128                 /* easy power of 2 case */
 129                 offset = (__u32)(addr & dev->chunkMask);
 130         } else {
 131                 /* Non power-of-2 case */
 132
 133                 loff_t chunkBase;
 134
 135                 chunk /= dev->chunkDiv;
 136
 137                 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
 138                 offset = (__u32)(addr - chunkBase);
 139         }
 140
 141         *chunkOut = chunk;
 142         *offsetOut = offset;
 143 }
 144
 145 /* Function to return the number of shifts for a power of 2 greater than or
 146  * equal to the given number
 147  * Note we don't try to cater for all possible numbers and this does not have to
 148  * be hellishly efficient.
 149  */
 150
 151 static __u32 ShiftsGE(__u32 x)
 152 {
 153         int extraBits;
 154         int nShifts;
 155
 156         nShifts = extraBits = 0;
 157
 158         while (x > 1) {
 159                 if (x & 1)
 160                         extraBits++;
 161                 x >>= 1;
 162                 nShifts++;
 163         }
 164
 165         if (extraBits)
 166                 nShifts++;
 167
 168         return nShifts;
 169 }
 170
 171 /* Function to return the number of shifts to get a 1 in bit 0
 172  */
 173
 174 static __u32 Shifts(__u32 x)
 175 {
 176         int nShifts;
 177
 178         nShifts =  0;
 179
 180         if (!x)
 181                 return 0;
 182
 183         while (!(x&1)) {
 184                 x >>= 1;
 185                 nShifts++;
 186         }
 187
 188         return nShifts;
 189 }
 190
 191
 192
 193 /*
 194  * Temporary buffer manipulations.
 195  */
 196
 197 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
 198 {
 199         int i;
 200         __u8 *buf = (__u8 *)1;
 201
 202         memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
 203
 204         for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
 205                 dev->tempBuffer[i].line = 0;    /* not in use */
 206                 dev->tempBuffer[i].buffer = buf =
 207                     YMALLOC_DMA(dev->totalBytesPerChunk);
 208         }
 209
 210         return buf ? YAFFS_OK : YAFFS_FAIL;
 211 }
 212
 213 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
 214 {
 215         int i, j;
 216
 217         dev->tempInUse++;
 218         if (dev->tempInUse > dev->maxTemp)
 219                 dev->maxTemp = dev->tempInUse;
 220
 221         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 222                 if (dev->tempBuffer[i].line == 0) {
 223                         dev->tempBuffer[i].line = lineNo;
 224                         if ((i + 1) > dev->maxTemp) {
 225                                 dev->maxTemp = i + 1;
 226                                 for (j = 0; j <= i; j++)
 227                                         dev->tempBuffer[j].maxLine =
 228                                             dev->tempBuffer[j].line;
 229                         }
 230
 231                         return dev->tempBuffer[i].buffer;
 232                 }
 233         }
 234
 235         T(YAFFS_TRACE_BUFFERS,
 236           (TSTR("Out of temp buffers at line %d, other held by lines:"),
 237            lineNo));
 238         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
 239                 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
 240
 241         T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 242
 243         /*
 244          * If we got here then we have to allocate an unmanaged one
 245          * This is not good.
 246          */
 247
 248         dev->unmanagedTempAllocations++;
 249         return YMALLOC(dev->nDataBytesPerChunk);
 250
 251 }
 252
 253 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
 254                                     int lineNo)
 255 {
 256         int i;
 257
 258         dev->tempInUse--;
 259
 260         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 261                 if (dev->tempBuffer[i].buffer == buffer) {
 262                         dev->tempBuffer[i].line = 0;
 263                         return;
 264                 }
 265         }
 266
 267         if (buffer) {
 268                 /* assume it is an unmanaged one. */
 269                 T(YAFFS_TRACE_BUFFERS,
 270                   (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
 271                    lineNo));
 272                 YFREE(buffer);
 273                 dev->unmanagedTempDeallocations++;
 274         }
 275
 276 }
 277
 278 /*
 279  * Determine if we have a managed buffer.
 280  */
 281 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
 282 {
 283         int i;
 284
 285         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 286                 if (dev->tempBuffer[i].buffer == buffer)
 287                         return 1;
 288         }
 289
 290         for (i = 0; i < dev->nShortOpCaches; i++) {
 291                 if (dev->srCache[i].data == buffer)
 292                         return 1;
 293         }
 294
 295         if (buffer == dev->checkpointBuffer)
 296                 return 1;
 297
 298         T(YAFFS_TRACE_ALWAYS,
 299                 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
 300         return 0;
 301 }
 302
 303
 304
 305 /*
 306  * Chunk bitmap manipulations
 307  */
 308
 309 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
 310 {
 311         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
 312                 T(YAFFS_TRACE_ERROR,
 313                         (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
 314                         blk));
 315                 YBUG();
 316         }
 317         return dev->chunkBits +
 318                 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 319 }
 320
 321 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
 322 {
 323         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
 324                         chunk < 0 || chunk >= dev->nChunksPerBlock) {
 325                 T(YAFFS_TRACE_ERROR,
 326                 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
 327                         blk, chunk));
 328                 YBUG();
 329         }
 330 }
 331
 332 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
 333 {
 334         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 335
 336         memset(blkBits, 0, dev->chunkBitmapStride);
 337 }
 338
 339 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
 340 {
 341         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 342
 343         yaffs_VerifyChunkBitId(dev, blk, chunk);
 344
 345         blkBits[chunk / 8] &= ~(1 << (chunk & 7));
 346 }
 347
 348 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
 349 {
 350         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 351
 352         yaffs_VerifyChunkBitId(dev, blk, chunk);
 353
 354         blkBits[chunk / 8] |= (1 << (chunk & 7));
 355 }
 356
 357 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
 358 {
 359         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 360         yaffs_VerifyChunkBitId(dev, blk, chunk);
 361
 362         return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
 363 }
 364
 365 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
 366 {
 367         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 368         int i;
 369         for (i = 0; i < dev->chunkBitmapStride; i++) {
 370                 if (*blkBits)
 371                         return 1;
 372                 blkBits++;
 373         }
 374         return 0;
 375 }
 376
 377 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
 378 {
 379         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 380         int i;
 381         int n = 0;
 382         for (i = 0; i < dev->chunkBitmapStride; i++) {
 383                 __u8 x = *blkBits;
 384                 while (x) {
 385                         if (x & 1)
 386                                 n++;
 387                         x >>= 1;
 388                 }
 389
 390                 blkBits++;
 391         }
 392         return n;
 393 }
 394
 395 /*
 396  * Verification code
 397  */
 398
 399 static int yaffs_SkipVerification(yaffs_Device *dev)
 400 {
 401         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
 402 }
 403
 404 static int yaffs_SkipFullVerification(yaffs_Device *dev)
 405 {
 406         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
 407 }
 408
 409 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
 410 {
 411         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
 412 }
 413
 414 static const char *blockStateName[] = {
 415 "Unknown",
 416 "Needs scanning",
 417 "Scanning",
 418 "Empty",
 419 "Allocating",
 420 "Full",
 421 "Dirty",
 422 "Checkpoint",
 423 "Collecting",
 424 "Dead"
 425 };
 426
 427 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
 428 {
 429         int actuallyUsed;
 430         int inUse;
 431
 432         if (yaffs_SkipVerification(dev))
 433                 return;
 434
 435         /* Report illegal runtime states */
 436         if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
 437                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
 438
 439         switch (bi->blockState) {
 440         case YAFFS_BLOCK_STATE_UNKNOWN:
 441         case YAFFS_BLOCK_STATE_SCANNING:
 442         case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
 443                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
 444                 n, blockStateName[bi->blockState]));
 445         }
 446
 447         /* Check pages in use and soft deletions are legal */
 448
 449         actuallyUsed = bi->pagesInUse - bi->softDeletions;
 450
 451         if (bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
 452            bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
 453            actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
 454                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
 455                 n, bi->pagesInUse, bi->softDeletions));
 456
 457
 458         /* Check chunk bitmap legal */
 459         inUse = yaffs_CountChunkBits(dev, n);
 460         if (inUse != bi->pagesInUse)
 461                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
 462                         n, bi->pagesInUse, inUse));
 463
 464         /* Check that the sequence number is valid.
 465          * Ten million is legal, but is very unlikely
 466          */
 467         if (dev->isYaffs2 &&
 468            (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
 469            (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
 470                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
 471                 n, bi->sequenceNumber));
 472 }
 473
 474 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
 475                 int n)
 476 {
 477         yaffs_VerifyBlock(dev, bi, n);
 478
 479         /* After collection the block should be in the erased state */
 480         /* This will need to change if we do partial gc */
 481
 482         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
 483                         bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
 484                 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
 485                         n, bi->blockState));
 486         }
 487 }
 488
 489 static void yaffs_VerifyBlocks(yaffs_Device *dev)
 490 {
 491         int i;
 492         int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
 493         int nIllegalBlockStates = 0;
 494
 495         if (yaffs_SkipVerification(dev))
 496                 return;
 497
 498         memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
 499
 500         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
 501                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
 502                 yaffs_VerifyBlock(dev, bi, i);
 503
 504                 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
 505                         nBlocksPerState[bi->blockState]++;
 506                 else
 507                         nIllegalBlockStates++;
 508         }
 509
 510         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 511         T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
 512
 513         T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
 514         if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
 515                 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
 516
 517         for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
 518                 T(YAFFS_TRACE_VERIFY,
 519                   (TSTR("%s %d blocks"TENDSTR),
 520                   blockStateName[i], nBlocksPerState[i]));
 521
 522         if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
 523                 T(YAFFS_TRACE_VERIFY,
 524                  (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
 525                  dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
 526
 527         if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
 528                 T(YAFFS_TRACE_VERIFY,
 529                  (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
 530                  dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
 531
 532         if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
 533                 T(YAFFS_TRACE_VERIFY,
 534                  (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
 535                  nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
 536
 537         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 538
 539 }
 540
 541 /*
 542  * Verify the object header. oh must be valid, but obj and tags may be NULL in which
 543  * case those tests will not be performed.
 544  */
 545 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
 546 {
 547         if (obj && yaffs_SkipVerification(obj->myDev))
 548                 return;
 549
 550         if (!(tags && obj && oh)) {
 551                 T(YAFFS_TRACE_VERIFY,
 552                                 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
 553                                 (__u32)tags, (__u32)obj, (__u32)oh));
 554                 return;
 555         }
 556
 557         if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
 558                         oh->type > YAFFS_OBJECT_TYPE_MAX)
 559                 T(YAFFS_TRACE_VERIFY,
 560                         (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
 561                         tags->objectId, oh->type));
 562
 563         if (tags->objectId != obj->objectId)
 564                 T(YAFFS_TRACE_VERIFY,
 565                         (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
 566                         tags->objectId, obj->objectId));
 567
 568
 569         /*
 570          * Check that the object's parent ids match if parentCheck requested.
 571          *
 572          * Tests do not apply to the root object.
 573          */
 574
 575         if (parentCheck && tags->objectId > 1 && !obj->parent)
 576                 T(YAFFS_TRACE_VERIFY,
 577                         (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
 578                         tags->objectId, oh->parentObjectId));
 579
 580         if (parentCheck && obj->parent &&
 581                         oh->parentObjectId != obj->parent->objectId &&
 582                         (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
 583                         obj->parent->objectId != YAFFS_OBJECTID_DELETED))
 584                 T(YAFFS_TRACE_VERIFY,
 585                         (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
 586                         tags->objectId, oh->parentObjectId, obj->parent->objectId));
 587
 588         if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
 589                 T(YAFFS_TRACE_VERIFY,
 590                         (TSTR("Obj %d header name is NULL"TENDSTR),
 591                         obj->objectId));
 592
 593         if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
 594                 T(YAFFS_TRACE_VERIFY,
 595                         (TSTR("Obj %d header name is 0xFF"TENDSTR),
 596                         obj->objectId));
 597 }
 598
 599
 600
 601 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
 602                                         __u32 level, int chunkOffset)
 603 {
 604         int i;
 605         yaffs_Device *dev = obj->myDev;
 606         int ok = 1;
 607
 608         if (tn) {
 609                 if (level > 0) {
 610
 611                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
 612                                 if (tn->internal[i]) {
 613                                         ok = yaffs_VerifyTnodeWorker(obj,
 614                                                         tn->internal[i],
 615                                                         level - 1,
 616                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
 617                                 }
 618                         }
 619                 } else if (level == 0) {
 620                         yaffs_ExtendedTags tags;
 621                         __u32 objectId = obj->objectId;
 622
 623                         chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
 624
 625                         for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
 626                                 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 627
 628                                 if (theChunk > 0) {
 629                                         /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
 630                                         yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 631                                         if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
 632                                                 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 633                                                         objectId, chunkOffset, theChunk,
 634                                                         tags.objectId, tags.chunkId));
 635                                         }
 636                                 }
 637                                 chunkOffset++;
 638                         }
 639                 }
 640         }
 641
 642         return ok;
 643
 644 }
 645
 646
 647 static void yaffs_VerifyFile(yaffs_Object *obj)
 648 {
 649         int requiredTallness;
 650         int actualTallness;
 651         __u32 lastChunk;
 652         __u32 x;
 653         __u32 i;
 654         yaffs_Device *dev;
 655         yaffs_ExtendedTags tags;
 656         yaffs_Tnode *tn;
 657         __u32 objectId;
 658
 659         if (!obj)
 660                 return;
 661
 662         if (yaffs_SkipVerification(obj->myDev))
 663                 return;
 664
 665         dev = obj->myDev;
 666         objectId = obj->objectId;
 667
 668         /* Check file size is consistent with tnode depth */
 669         lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
 670         x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
 671         requiredTallness = 0;
 672         while (x > 0) {
 673                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 674                 requiredTallness++;
 675         }
 676
 677         actualTallness = obj->variant.fileVariant.topLevel;
 678
 679         if (requiredTallness > actualTallness)
 680                 T(YAFFS_TRACE_VERIFY,
 681                 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
 682                  obj->objectId, actualTallness, requiredTallness));
 683
 684
 685         /* Check that the chunks in the tnode tree are all correct.
 686          * We do this by scanning through the tnode tree and
 687          * checking the tags for every chunk match.
 688          */
 689
 690         if (yaffs_SkipNANDVerification(dev))
 691                 return;
 692
 693         for (i = 1; i <= lastChunk; i++) {
 694                 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
 695
 696                 if (tn) {
 697                         __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 698                         if (theChunk > 0) {
 699                                 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
 700                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 701                                 if (tags.objectId != objectId || tags.chunkId != i) {
 702                                         T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 703                                                 objectId, i, theChunk,
 704                                                 tags.objectId, tags.chunkId));
 705                                 }
 706                         }
 707                 }
 708         }
 709 }
 710
 711
 712 static void yaffs_VerifyHardLink(yaffs_Object *obj)
 713 {
 714         if (obj && yaffs_SkipVerification(obj->myDev))
 715                 return;
 716
 717         /* Verify sane equivalent object */
 718 }
 719
 720 static void yaffs_VerifySymlink(yaffs_Object *obj)
 721 {
 722         if (obj && yaffs_SkipVerification(obj->myDev))
 723                 return;
 724
 725         /* Verify symlink string */
 726 }
 727
 728 static void yaffs_VerifySpecial(yaffs_Object *obj)
 729 {
 730         if (obj && yaffs_SkipVerification(obj->myDev))
 731                 return;
 732 }
 733
 734 static void yaffs_VerifyObject(yaffs_Object *obj)
 735 {
 736         yaffs_Device *dev;
 737
 738         __u32 chunkMin;
 739         __u32 chunkMax;
 740
 741         __u32 chunkIdOk;
 742         __u32 chunkInRange;
 743         __u32 chunkShouldNotBeDeleted;
 744         __u32 chunkValid;
 745
 746         if (!obj)
 747                 return;
 748
 749         if (obj->beingCreated)
 750                 return;
 751
 752         dev = obj->myDev;
 753
 754         if (yaffs_SkipVerification(dev))
 755                 return;
 756
 757         /* Check sane object header chunk */
 758
 759         chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
 760         chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
 761
 762         chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
 763         chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
 764         chunkValid = chunkInRange &&
 765                         yaffs_CheckChunkBit(dev,
 766                                         obj->hdrChunk / dev->nChunksPerBlock,
 767                                         obj->hdrChunk % dev->nChunksPerBlock);
 768         chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
 769
 770         if (!obj->fake &&
 771                         (!chunkIdOk || chunkShouldNotBeDeleted)) {
 772                 T(YAFFS_TRACE_VERIFY,
 773                         (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
 774                         obj->objectId, obj->hdrChunk,
 775                         chunkIdOk ? "" : ",out of range",
 776                         chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
 777         }
 778
 779         if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
 780                 yaffs_ExtendedTags tags;
 781                 yaffs_ObjectHeader *oh;
 782                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 783
 784                 oh = (yaffs_ObjectHeader *)buffer;
 785
 786                 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
 787                                 &tags);
 788
 789                 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
 790
 791                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 792         }
 793
 794         /* Verify it has a parent */
 795         if (obj && !obj->fake &&
 796                         (!obj->parent || obj->parent->myDev != dev)) {
 797                 T(YAFFS_TRACE_VERIFY,
 798                         (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
 799                         obj->objectId, obj->parent));
 800         }
 801
 802         /* Verify parent is a directory */
 803         if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
 804                 T(YAFFS_TRACE_VERIFY,
 805                         (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
 806                         obj->objectId, obj->parent->variantType));
 807         }
 808
 809         switch (obj->variantType) {
 810         case YAFFS_OBJECT_TYPE_FILE:
 811                 yaffs_VerifyFile(obj);
 812                 break;
 813         case YAFFS_OBJECT_TYPE_SYMLINK:
 814                 yaffs_VerifySymlink(obj);
 815                 break;
 816         case YAFFS_OBJECT_TYPE_DIRECTORY:
 817                 yaffs_VerifyDirectory(obj);
 818                 break;
 819         case YAFFS_OBJECT_TYPE_HARDLINK:
 820                 yaffs_VerifyHardLink(obj);
 821                 break;
 822         case YAFFS_OBJECT_TYPE_SPECIAL:
 823                 yaffs_VerifySpecial(obj);
 824                 break;
 825         case YAFFS_OBJECT_TYPE_UNKNOWN:
 826         default:
 827                 T(YAFFS_TRACE_VERIFY,
 828                 (TSTR("Obj %d has illegaltype %d"TENDSTR),
 829                 obj->objectId, obj->variantType));
 830                 break;
 831         }
 832 }
 833
 834 static void yaffs_VerifyObjects(yaffs_Device *dev)
 835 {
 836         yaffs_Object *obj;
 837         int i;
 838         struct ylist_head *lh;
 839
 840         if (yaffs_SkipVerification(dev))
 841                 return;
 842
 843         /* Iterate through the objects in each hash entry */
 844
 845         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
 846                 ylist_for_each(lh, &dev->objectBucket[i].list) {
 847                         if (lh) {
 848                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
 849                                 yaffs_VerifyObject(obj);
 850                         }
 851                 }
 852         }
 853 }
 854
 855
 856 /*
 857  *  Simple hash function. Needs to have a reasonable spread
 858  */
 859
 860 static Y_INLINE int yaffs_HashFunction(int n)
 861 {
 862         n = abs(n);
 863         return n % YAFFS_NOBJECT_BUCKETS;
 864 }
 865
 866 /*
 867  * Access functions to useful fake objects.
 868  * Note that root might have a presence in NAND if permissions are set.
 869  */
 870
 871 yaffs_Object *yaffs_Root(yaffs_Device *dev)
 872 {
 873         return dev->rootDir;
 874 }
 875
 876 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 877 {
 878         return dev->lostNFoundDir;
 879 }
 880
 881
 882 /*
 883  *  Erased NAND checking functions
 884  */
 885
 886 int yaffs_CheckFF(__u8 *buffer, int nBytes)
 887 {
 888         /* Horrible, slow implementation */
 889         while (nBytes--) {
 890                 if (*buffer != 0xFF)
 891                         return 0;
 892                 buffer++;
 893         }
 894         return 1;
 895 }
 896
 897 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 898                                 int chunkInNAND)
 899 {
 900         int retval = YAFFS_OK;
 901         __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
 902         yaffs_ExtendedTags tags;
 903         int result;
 904
 905         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 906
 907         if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
 908                 retval = YAFFS_FAIL;
 909
 910         if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
 911                 T(YAFFS_TRACE_NANDACCESS,
 912                   (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
 913                 retval = YAFFS_FAIL;
 914         }
 915
 916         yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 917
 918         return retval;
 919
 920 }
 921
 922 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 923                                         const __u8 *data,
 924                                         yaffs_ExtendedTags *tags,
 925                                         int useReserve)
 926 {
 927         int attempts = 0;
 928         int writeOk = 0;
 929         int chunk;
 930
 931         yaffs_InvalidateCheckpoint(dev);
 932
 933         do {
 934                 yaffs_BlockInfo *bi = 0;
 935                 int erasedOk = 0;
 936
 937                 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
 938                 if (chunk < 0) {
 939                         /* no space */
 940                         break;
 941                 }
 942
 943                 /* First check this chunk is erased, if it needs
 944                  * checking.  The checking policy (unless forced
 945                  * always on) is as follows:
 946                  *
 947                  * Check the first page we try to write in a block.
 948                  * If the check passes then we don't need to check any
 949                  * more.        If the check fails, we check again...
 950                  * If the block has been erased, we don't need to check.
 951                  *
 952                  * However, if the block has been prioritised for gc,
 953                  * then we think there might be something odd about
 954                  * this block and stop using it.
 955                  *
 956                  * Rationale: We should only ever see chunks that have
 957                  * not been erased if there was a partially written
 958                  * chunk due to power loss.  This checking policy should
 959                  * catch that case with very few checks and thus save a
 960                  * lot of checks that are most likely not needed.
 961                  */
 962                 if (bi->gcPrioritise) {
 963                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
 964                         /* try another chunk */
 965                         continue;
 966                 }
 967
 968                 /* let's give it a try */
 969                 attempts++;
 970
 971 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
 972                 bi->skipErasedCheck = 0;
 973 #endif
 974                 if (!bi->skipErasedCheck) {
 975                         erasedOk = yaffs_CheckChunkErased(dev, chunk);
 976                         if (erasedOk != YAFFS_OK) {
 977                                 T(YAFFS_TRACE_ERROR,
 978                                 (TSTR("**>> yaffs chunk %d was not erased"
 979                                 TENDSTR), chunk));
 980
 981                                 /* try another chunk */
 982                                 continue;
 983                         }
 984                         bi->skipErasedCheck = 1;
 985                 }
 986
 987                 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
 988                                 data, tags);
 989                 if (writeOk != YAFFS_OK) {
 990                         yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
 991                         /* try another chunk */
 992                         continue;
 993                 }
 994
 995                 /* Copy the data into the robustification buffer */
 996                 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
 997
 998         } while (writeOk != YAFFS_OK &&
 999                 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1000
1001         if (!writeOk)
1002                 chunk = -1;
1003
1004         if (attempts > 1) {
1005                 T(YAFFS_TRACE_ERROR,
1006                         (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1007                         attempts));
1008
1009                 dev->nRetriedWrites += (attempts - 1);
1010         }
1011
1012         return chunk;
1013 }
1014
1015 /*
1016  * Block retiring for handling a broken block.
1017  */
1018
1019 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1020 {
1021         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1022
1023         yaffs_InvalidateCheckpoint(dev);
1024
1025         if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1026                 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1027                         T(YAFFS_TRACE_ALWAYS, (TSTR(
1028                                 "yaffs: Failed to mark bad and erase block %d"
1029                                 TENDSTR), blockInNAND));
1030                 } else {
1031                         yaffs_ExtendedTags tags;
1032                         int chunkId = blockInNAND * dev->nChunksPerBlock;
1033
1034                         __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1035
1036                         memset(buffer, 0xff, dev->nDataBytesPerChunk);
1037                         yaffs_InitialiseTags(&tags);
1038                         tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1039                         if (dev->writeChunkWithTagsToNAND(dev, chunkId -
1040                                 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1041                                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1042                                         TCONT("write bad block marker to block %d")
1043                                         TENDSTR), blockInNAND));
1044
1045                         yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1046                 }
1047         }
1048
1049         bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1050         bi->gcPrioritise = 0;
1051         bi->needsRetiring = 0;
1052
1053         dev->nRetiredBlocks++;
1054 }
1055
1056 /*
1057  * Functions for robustisizing TODO
1058  *
1059  */
1060
1061 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1062                                 const __u8 *data,
1063                                 const yaffs_ExtendedTags *tags)
1064 {
1065 }
1066
1067 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1068                                 const yaffs_ExtendedTags *tags)
1069 {
1070 }
1071
1072 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1073 {
1074         if (!bi->gcPrioritise) {
1075                 bi->gcPrioritise = 1;
1076                 dev->hasPendingPrioritisedGCs = 1;
1077                 bi->chunkErrorStrikes++;
1078
1079                 if (bi->chunkErrorStrikes > 3) {
1080                         bi->needsRetiring = 1; /* Too many stikes, so retire this */
1081                         T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1082
1083                 }
1084         }
1085 }
1086
1087 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1088                 int erasedOk)
1089 {
1090         int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1091         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1092
1093         yaffs_HandleChunkError(dev, bi);
1094
1095         if (erasedOk) {
1096                 /* Was an actual write failure, so mark the block for retirement  */
1097                 bi->needsRetiring = 1;
1098                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1099                   (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1100         }
1101
1102         /* Delete the chunk */
1103         yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1104 }
1105
1106
1107 /*---------------- Name handling functions ------------*/
1108
1109 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1110 {
1111         __u16 sum = 0;
1112         __u16 i = 1;
1113
1114         const YUCHAR *bname = (const YUCHAR *) name;
1115         if (bname) {
1116                 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1117
1118 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1119                         sum += yaffs_toupper(*bname) * i;
1120 #else
1121                         sum += (*bname) * i;
1122 #endif
1123                         i++;
1124                         bname++;
1125                 }
1126         }
1127         return sum;
1128 }
1129
1130 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1131 {
1132 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1133         memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1134         if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
1135                 yaffs_strcpy(obj->shortName, name);
1136         else
1137                 obj->shortName[0] = _Y('\0');
1138 #endif
1139         obj->sum = yaffs_CalcNameSum(name);
1140 }
1141
1142 /*-------------------- TNODES -------------------
1143
1144  * List of spare tnodes
1145  * The list is hooked together using the first pointer
1146  * in the tnode.
1147  */
1148
1149 /* yaffs_CreateTnodes creates a bunch more tnodes and
1150  * adds them to the tnode free list.
1151  * Don't use this function directly
1152  */
1153
1154 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1155 {
1156         int i;
1157         int tnodeSize;
1158         yaffs_Tnode *newTnodes;
1159         __u8 *mem;
1160         yaffs_Tnode *curr;
1161         yaffs_Tnode *next;
1162         yaffs_TnodeList *tnl;
1163
1164         if (nTnodes < 1)
1165                 return YAFFS_OK;
1166
1167         /* Calculate the tnode size in bytes for variable width tnode support.
1168          * Must be a multiple of 32-bits  */
1169         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1170
1171         if (tnodeSize < sizeof(yaffs_Tnode))
1172                 tnodeSize = sizeof(yaffs_Tnode);
1173
1174         /* make these things */
1175
1176         newTnodes = YMALLOC(nTnodes * tnodeSize);
1177         mem = (__u8 *)newTnodes;
1178
1179         if (!newTnodes) {
1180                 T(YAFFS_TRACE_ERROR,
1181                         (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1182                 return YAFFS_FAIL;
1183         }
1184
1185         /* Hook them into the free list */
1186 #if 0
1187         for (i = 0; i < nTnodes - 1; i++) {
1188                 newTnodes[i].internal[0] = &newTnodes[i + 1];
1189 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1190                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1191 #endif
1192         }
1193
1194         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1195 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1196         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1197 #endif
1198         dev->freeTnodes = newTnodes;
1199 #else
1200         /* New hookup for wide tnodes */
1201         for (i = 0; i < nTnodes - 1; i++) {
1202                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1203                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1204                 curr->internal[0] = next;
1205         }
1206
1207         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1208         curr->internal[0] = dev->freeTnodes;
1209         dev->freeTnodes = (yaffs_Tnode *)mem;
1210
1211 #endif
1212
1213
1214         dev->nFreeTnodes += nTnodes;
1215         dev->nTnodesCreated += nTnodes;
1216
1217         /* Now add this bunch of tnodes to a list for freeing up.
1218          * NB If we can't add this to the management list it isn't fatal
1219          * but it just means we can't free this bunch of tnodes later.
1220          */
1221
1222         tnl = YMALLOC(sizeof(yaffs_TnodeList));
1223         if (!tnl) {
1224                 T(YAFFS_TRACE_ERROR,
1225                   (TSTR
1226                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
1227                    return YAFFS_FAIL;
1228         } else {
1229                 tnl->tnodes = newTnodes;
1230                 tnl->next = dev->allocatedTnodeList;
1231                 dev->allocatedTnodeList = tnl;
1232         }
1233
1234         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1235
1236         return YAFFS_OK;
1237 }
1238
1239 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1240
1241 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1242 {
1243         yaffs_Tnode *tn = NULL;
1244
1245         /* If there are none left make more */
1246         if (!dev->freeTnodes)
1247                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1248
1249         if (dev->freeTnodes) {
1250                 tn = dev->freeTnodes;
1251 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1252                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1253                         /* Hoosterman, this thing looks like it isn't in the list */
1254                         T(YAFFS_TRACE_ALWAYS,
1255                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1256                 }
1257 #endif
1258                 dev->freeTnodes = dev->freeTnodes->internal[0];
1259                 dev->nFreeTnodes--;
1260         }
1261
1262         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1263
1264         return tn;
1265 }
1266
1267 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1268 {
1269         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1270         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1271
1272         if (tnodeSize < sizeof(yaffs_Tnode))
1273                 tnodeSize = sizeof(yaffs_Tnode);
1274
1275         if (tn)
1276                 memset(tn, 0, tnodeSize);
1277
1278         return tn;
1279 }
1280
1281 /* FreeTnode frees up a tnode and puts it back on the free list */
1282 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1283 {
1284         if (tn) {
1285 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1286                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1287                         /* Hoosterman, this thing looks like it is already in the list */
1288                         T(YAFFS_TRACE_ALWAYS,
1289                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1290                 }
1291                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1292 #endif
1293                 tn->internal[0] = dev->freeTnodes;
1294                 dev->freeTnodes = tn;
1295                 dev->nFreeTnodes++;
1296         }
1297         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1298 }
1299
1300 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1301 {
1302         /* Free the list of allocated tnodes */
1303         yaffs_TnodeList *tmp;
1304
1305         while (dev->allocatedTnodeList) {
1306                 tmp = dev->allocatedTnodeList->next;
1307
1308                 YFREE(dev->allocatedTnodeList->tnodes);
1309                 YFREE(dev->allocatedTnodeList);
1310                 dev->allocatedTnodeList = tmp;
1311
1312         }
1313
1314         dev->freeTnodes = NULL;
1315         dev->nFreeTnodes = 0;
1316 }
1317
1318 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1319 {
1320         dev->allocatedTnodeList = NULL;
1321         dev->freeTnodes = NULL;
1322         dev->nFreeTnodes = 0;
1323         dev->nTnodesCreated = 0;
1324 }
1325
1326
1327 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1328                 unsigned val)
1329 {
1330         __u32 *map = (__u32 *)tn;
1331         __u32 bitInMap;
1332         __u32 bitInWord;
1333         __u32 wordInMap;
1334         __u32 mask;
1335
1336         pos &= YAFFS_TNODES_LEVEL0_MASK;
1337         val >>= dev->chunkGroupBits;
1338
1339         bitInMap = pos * dev->tnodeWidth;
1340         wordInMap = bitInMap / 32;
1341         bitInWord = bitInMap & (32 - 1);
1342
1343         mask = dev->tnodeMask << bitInWord;
1344
1345         map[wordInMap] &= ~mask;
1346         map[wordInMap] |= (mask & (val << bitInWord));
1347
1348         if (dev->tnodeWidth > (32 - bitInWord)) {
1349                 bitInWord = (32 - bitInWord);
1350                 wordInMap++;;
1351                 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1352                 map[wordInMap] &= ~mask;
1353                 map[wordInMap] |= (mask & (val >> bitInWord));
1354         }
1355 }
1356
1357 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1358                 unsigned pos)
1359 {
1360         __u32 *map = (__u32 *)tn;
1361         __u32 bitInMap;
1362         __u32 bitInWord;
1363         __u32 wordInMap;
1364         __u32 val;
1365
1366         pos &= YAFFS_TNODES_LEVEL0_MASK;
1367
1368         bitInMap = pos * dev->tnodeWidth;
1369         wordInMap = bitInMap / 32;
1370         bitInWord = bitInMap & (32 - 1);
1371
1372         val = map[wordInMap] >> bitInWord;
1373
1374         if      (dev->tnodeWidth > (32 - bitInWord)) {
1375                 bitInWord = (32 - bitInWord);
1376                 wordInMap++;;
1377                 val |= (map[wordInMap] << bitInWord);
1378         }
1379
1380         val &= dev->tnodeMask;
1381         val <<= dev->chunkGroupBits;
1382
1383         return val;
1384 }
1385
1386 /* ------------------- End of individual tnode manipulation -----------------*/
1387
1388 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1389  * The look up tree is represented by the top tnode and the number of topLevel
1390  * in the tree. 0 means only the level 0 tnode is in the tree.
1391  */
1392
1393 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1394 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1395                                         yaffs_FileStructure *fStruct,
1396                                         __u32 chunkId)
1397 {
1398         yaffs_Tnode *tn = fStruct->top;
1399         __u32 i;
1400         int requiredTallness;
1401         int level = fStruct->topLevel;
1402
1403         /* Check sane level and chunk Id */
1404         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1405                 return NULL;
1406
1407         if (chunkId > YAFFS_MAX_CHUNK_ID)
1408                 return NULL;
1409
1410         /* First check we're tall enough (ie enough topLevel) */
1411
1412         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1413         requiredTallness = 0;
1414         while (i) {
1415                 i >>= YAFFS_TNODES_INTERNAL_BITS;
1416                 requiredTallness++;
1417         }
1418
1419         if (requiredTallness > fStruct->topLevel)
1420                 return NULL; /* Not tall enough, so we can't find it */
1421
1422         /* Traverse down to level 0 */
1423         while (level > 0 && tn) {
1424                 tn = tn->internal[(chunkId >>
1425                         (YAFFS_TNODES_LEVEL0_BITS +
1426                                 (level - 1) *
1427                                 YAFFS_TNODES_INTERNAL_BITS)) &
1428                         YAFFS_TNODES_INTERNAL_MASK];
1429                 level--;
1430         }
1431
1432         return tn;
1433 }
1434
1435 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1436  * This happens in two steps:
1437  *  1. If the tree isn't tall enough, then make it taller.
1438  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1439  *
1440  * Used when modifying the tree.
1441  *
1442  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1443  *  be plugged into the ttree.
1444  */
1445
1446 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1447                                         yaffs_FileStructure *fStruct,
1448                                         __u32 chunkId,
1449                                         yaffs_Tnode *passedTn)
1450 {
1451         int requiredTallness;
1452         int i;
1453         int l;
1454         yaffs_Tnode *tn;
1455
1456         __u32 x;
1457
1458
1459         /* Check sane level and page Id */
1460         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1461                 return NULL;
1462
1463         if (chunkId > YAFFS_MAX_CHUNK_ID)
1464                 return NULL;
1465
1466         /* First check we're tall enough (ie enough topLevel) */
1467
1468         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1469         requiredTallness = 0;
1470         while (x) {
1471                 x >>= YAFFS_TNODES_INTERNAL_BITS;
1472                 requiredTallness++;
1473         }
1474
1475
1476         if (requiredTallness > fStruct->topLevel) {
1477                 /* Not tall enough, gotta make the tree taller */
1478                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1479
1480                         tn = yaffs_GetTnode(dev);
1481
1482                         if (tn) {
1483                                 tn->internal[0] = fStruct->top;
1484                                 fStruct->top = tn;
1485                         } else {
1486                                 T(YAFFS_TRACE_ERROR,
1487                                   (TSTR("yaffs: no more tnodes" TENDSTR)));
1488                         }
1489                 }
1490
1491                 fStruct->topLevel = requiredTallness;
1492         }
1493
1494         /* Traverse down to level 0, adding anything we need */
1495
1496         l = fStruct->topLevel;
1497         tn = fStruct->top;
1498
1499         if (l > 0) {
1500                 while (l > 0 && tn) {
1501                         x = (chunkId >>
1502                              (YAFFS_TNODES_LEVEL0_BITS +
1503                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1504                             YAFFS_TNODES_INTERNAL_MASK;
1505
1506
1507                         if ((l > 1) && !tn->internal[x]) {
1508                                 /* Add missing non-level-zero tnode */
1509                                 tn->internal[x] = yaffs_GetTnode(dev);
1510
1511                         } else if (l == 1) {
1512                                 /* Looking from level 1 at level 0 */
1513                                 if (passedTn) {
1514                                         /* If we already have one, then release it.*/
1515                                         if (tn->internal[x])
1516                                                 yaffs_FreeTnode(dev, tn->internal[x]);
1517                                         tn->internal[x] = passedTn;
1518
1519                                 } else if (!tn->internal[x]) {
1520                                         /* Don't have one, none passed in */
1521                                         tn->internal[x] = yaffs_GetTnode(dev);
1522                                 }
1523                         }
1524
1525                         tn = tn->internal[x];
1526                         l--;
1527                 }
1528         } else {
1529                 /* top is level 0 */
1530                 if (passedTn) {
1531                         memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1532                         yaffs_FreeTnode(dev, passedTn);
1533                 }
1534         }
1535
1536         return tn;
1537 }
1538
1539 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1540                                 yaffs_ExtendedTags *tags, int objectId,
1541                                 int chunkInInode)
1542 {
1543         int j;
1544
1545         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1546                 if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
1547                                 theChunk % dev->nChunksPerBlock)) {
1548
1549                         if(dev->chunkGroupSize == 1)
1550                                 return theChunk;
1551                         else {
1552                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1553                                                                 tags);
1554                                 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1555                                         /* found it; */
1556                                         return theChunk;
1557                                 }
1558                         }
1559                 }
1560                 theChunk++;
1561         }
1562         return -1;
1563 }
1564
1565
1566 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1567  * chunks and tnodes in the file
1568  * Returns 1 if the tree was deleted.
1569  * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1570  */
1571
1572 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1573                               int chunkOffset, int *limit)
1574 {
1575         int i;
1576         int chunkInInode;
1577         int theChunk;
1578         yaffs_ExtendedTags tags;
1579         int foundChunk;
1580         yaffs_Device *dev = in->myDev;
1581
1582         int allDone = 1;
1583
1584         if (tn) {
1585                 if (level > 0) {
1586                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1587                              i--) {
1588                                 if (tn->internal[i]) {
1589                                         if (limit && (*limit) < 0) {
1590                                                 allDone = 0;
1591                                         } else {
1592                                                 allDone =
1593                                                         yaffs_DeleteWorker(in,
1594                                                                 tn->
1595                                                                 internal
1596                                                                 [i],
1597                                                                 level -
1598                                                                 1,
1599                                                                 (chunkOffset
1600                                                                         <<
1601                                                                         YAFFS_TNODES_INTERNAL_BITS)
1602                                                                 + i,
1603                                                                 limit);
1604                                         }
1605                                         if (allDone) {
1606                                                 yaffs_FreeTnode(dev,
1607                                                                 tn->
1608                                                                 internal[i]);
1609                                                 tn->internal[i] = NULL;
1610                                         }
1611                                 }
1612                         }
1613                         return (allDone) ? 1 : 0;
1614                 } else if (level == 0) {
1615                         int hitLimit = 0;
1616
1617                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1618                                         i--) {
1619                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1620                                 if (theChunk) {
1621
1622                                         chunkInInode = (chunkOffset <<
1623                                                 YAFFS_TNODES_LEVEL0_BITS) + i;
1624
1625                                         foundChunk =
1626                                                 yaffs_FindChunkInGroup(dev,
1627                                                                 theChunk,
1628                                                                 &tags,
1629                                                                 in->objectId,
1630                                                                 chunkInInode);
1631
1632                                         if (foundChunk > 0) {
1633                                                 yaffs_DeleteChunk(dev,
1634                                                                   foundChunk, 1,
1635                                                                   __LINE__);
1636                                                 in->nDataChunks--;
1637                                                 if (limit) {
1638                                                         *limit = *limit - 1;
1639                                                         if (*limit <= 0)
1640                                                                 hitLimit = 1;
1641                                                 }
1642
1643                                         }
1644
1645                                         yaffs_PutLevel0Tnode(dev, tn, i, 0);
1646                                 }
1647
1648                         }
1649                         return (i < 0) ? 1 : 0;
1650
1651                 }
1652
1653         }
1654
1655         return 1;
1656
1657 }
1658
1659 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1660 {
1661         yaffs_BlockInfo *theBlock;
1662
1663         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1664
1665         theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1666         if (theBlock) {
1667                 theBlock->softDeletions++;
1668                 dev->nFreeChunks++;
1669         }
1670 }
1671
1672 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1673  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1674  * of the tnode.
1675  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1676  */
1677
1678 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1679                                   __u32 level, int chunkOffset)
1680 {
1681         int i;
1682         int theChunk;
1683         int allDone = 1;
1684         yaffs_Device *dev = in->myDev;
1685
1686         if (tn) {
1687                 if (level > 0) {
1688
1689                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1690                              i--) {
1691                                 if (tn->internal[i]) {
1692                                         allDone =
1693                                             yaffs_SoftDeleteWorker(in,
1694                                                                    tn->
1695                                                                    internal[i],
1696                                                                    level - 1,
1697                                                                    (chunkOffset
1698                                                                     <<
1699                                                                     YAFFS_TNODES_INTERNAL_BITS)
1700                                                                    + i);
1701                                         if (allDone) {
1702                                                 yaffs_FreeTnode(dev,
1703                                                                 tn->
1704                                                                 internal[i]);
1705                                                 tn->internal[i] = NULL;
1706                                         } else {
1707                                                 /* Hoosterman... how could this happen? */
1708                                         }
1709                                 }
1710                         }
1711                         return (allDone) ? 1 : 0;
1712                 } else if (level == 0) {
1713
1714                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1715                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1716                                 if (theChunk) {
1717                                         /* Note this does not find the real chunk, only the chunk group.
1718                                          * We make an assumption that a chunk group is not larger than
1719                                          * a block.
1720                                          */
1721                                         yaffs_SoftDeleteChunk(dev, theChunk);
1722                                         yaffs_PutLevel0Tnode(dev, tn, i, 0);
1723                                 }
1724
1725                         }
1726                         return 1;
1727
1728                 }
1729
1730         }
1731
1732         return 1;
1733
1734 }
1735
1736 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1737 {
1738         if (obj->deleted &&
1739             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1740                 if (obj->nDataChunks <= 0) {
1741                         /* Empty file with no duplicate object headers, just delete it immediately */
1742                         yaffs_FreeTnode(obj->myDev,
1743                                         obj->variant.fileVariant.top);
1744                         obj->variant.fileVariant.top = NULL;
1745                         T(YAFFS_TRACE_TRACING,
1746                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1747                            obj->objectId));
1748                         yaffs_DoGenericObjectDeletion(obj);
1749                 } else {
1750                         yaffs_SoftDeleteWorker(obj,
1751                                                obj->variant.fileVariant.top,
1752                                                obj->variant.fileVariant.
1753                                                topLevel, 0);
1754                         obj->softDeleted = 1;
1755                 }
1756         }
1757 }
1758
1759 /* Pruning removes any part of the file structure tree that is beyond the
1760  * bounds of the file (ie that does not point to chunks).
1761  *
1762  * A file should only get pruned when its size is reduced.
1763  *
1764  * Before pruning, the chunks must be pulled from the tree and the
1765  * level 0 tnode entries must be zeroed out.
1766  * Could also use this for file deletion, but that's probably better handled
1767  * by a special case.
1768  */
1769
1770 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1771                                 __u32 level, int del0)
1772 {
1773         int i;
1774         int hasData;
1775
1776         if (tn) {
1777                 hasData = 0;
1778
1779                 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1780                         if (tn->internal[i] && level > 0) {
1781                                 tn->internal[i] =
1782                                     yaffs_PruneWorker(dev, tn->internal[i],
1783                                                       level - 1,
1784                                                       (i == 0) ? del0 : 1);
1785                         }
1786
1787                         if (tn->internal[i])
1788                                 hasData++;
1789                 }
1790
1791                 if (hasData == 0 && del0) {
1792                         /* Free and return NULL */
1793
1794                         yaffs_FreeTnode(dev, tn);
1795                         tn = NULL;
1796                 }
1797
1798         }
1799
1800         return tn;
1801
1802 }
1803
1804 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1805                                 yaffs_FileStructure *fStruct)
1806 {
1807         int i;
1808         int hasData;
1809         int done = 0;
1810         yaffs_Tnode *tn;
1811
1812         if (fStruct->topLevel > 0) {
1813                 fStruct->top =
1814                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1815
1816                 /* Now we have a tree with all the non-zero branches NULL but the height
1817                  * is the same as it was.
1818                  * Let's see if we can trim internal tnodes to shorten the tree.
1819                  * We can do this if only the 0th element in the tnode is in use
1820                  * (ie all the non-zero are NULL)
1821                  */
1822
1823                 while (fStruct->topLevel && !done) {
1824                         tn = fStruct->top;
1825
1826                         hasData = 0;
1827                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1828                                 if (tn->internal[i])
1829                                         hasData++;
1830                         }
1831
1832                         if (!hasData) {
1833                                 fStruct->top = tn->internal[0];
1834                                 fStruct->topLevel--;
1835                                 yaffs_FreeTnode(dev, tn);
1836                         } else {
1837                                 done = 1;
1838                         }
1839                 }
1840         }
1841
1842         return YAFFS_OK;
1843 }
1844
1845 /*-------------------- End of File Structure functions.-------------------*/
1846
1847 /* yaffs_CreateFreeObjects creates a bunch more objects and
1848  * adds them to the object free list.
1849  */
1850 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1851 {
1852         int i;
1853         yaffs_Object *newObjects;
1854         yaffs_ObjectList *list;
1855
1856         if (nObjects < 1)
1857                 return YAFFS_OK;
1858
1859         /* make these things */
1860         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1861         list = YMALLOC(sizeof(yaffs_ObjectList));
1862
1863         if (!newObjects || !list) {
1864                 if (newObjects)
1865                         YFREE(newObjects);
1866                 if (list)
1867                         YFREE(list);
1868                 T(YAFFS_TRACE_ALLOCATE,
1869                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1870                 return YAFFS_FAIL;
1871         }
1872
1873         /* Hook them into the free list */
1874         for (i = 0; i < nObjects - 1; i++) {
1875                 newObjects[i].siblings.next =
1876                                 (struct ylist_head *)(&newObjects[i + 1]);
1877         }
1878
1879         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1880         dev->freeObjects = newObjects;
1881         dev->nFreeObjects += nObjects;
1882         dev->nObjectsCreated += nObjects;
1883
1884         /* Now add this bunch of Objects to a list for freeing up. */
1885
1886         list->objects = newObjects;
1887         list->next = dev->allocatedObjectList;
1888         dev->allocatedObjectList = list;
1889
1890         return YAFFS_OK;
1891 }
1892
1893
1894 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1895 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1896 {
1897         yaffs_Object *tn = NULL;
1898
1899 #ifdef VALGRIND_TEST
1900         tn = YMALLOC(sizeof(yaffs_Object));
1901 #else
1902         /* If there are none left make more */
1903         if (!dev->freeObjects)
1904                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1905
1906         if (dev->freeObjects) {
1907                 tn = dev->freeObjects;
1908                 dev->freeObjects =
1909                         (yaffs_Object *) (dev->freeObjects->siblings.next);
1910                 dev->nFreeObjects--;
1911         }
1912 #endif
1913         if (tn) {
1914                 /* Now sweeten it up... */
1915
1916                 memset(tn, 0, sizeof(yaffs_Object));
1917                 tn->beingCreated = 1;
1918
1919                 tn->myDev = dev;
1920                 tn->hdrChunk = 0;
1921                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1922                 YINIT_LIST_HEAD(&(tn->hardLinks));
1923                 YINIT_LIST_HEAD(&(tn->hashLink));
1924                 YINIT_LIST_HEAD(&tn->siblings);
1925
1926
1927                 /* Now make the directory sane */
1928                 if (dev->rootDir) {
1929                         tn->parent = dev->rootDir;
1930                         ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
1931                 }
1932
1933                 /* Add it to the lost and found directory.
1934                  * NB Can't put root or lostNFound in lostNFound so
1935                  * check if lostNFound exists first
1936                  */
1937                 if (dev->lostNFoundDir)
1938                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1939
1940                 tn->beingCreated = 0;
1941         }
1942
1943         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1944
1945         return tn;
1946 }
1947
1948 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
1949                                                __u32 mode)
1950 {
1951
1952         yaffs_Object *obj =
1953             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1954         if (obj) {
1955                 obj->fake = 1;          /* it is fake so it might have no NAND presence... */
1956                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1957                 obj->unlinkAllowed = 0; /* ... or unlink it */
1958                 obj->deleted = 0;
1959                 obj->unlinked = 0;
1960                 obj->yst_mode = mode;
1961                 obj->myDev = dev;
1962                 obj->hdrChunk = 0;      /* Not a valid chunk. */
1963         }
1964
1965         return obj;
1966
1967 }
1968
1969 static void yaffs_UnhashObject(yaffs_Object *tn)
1970 {
1971         int bucket;
1972         yaffs_Device *dev = tn->myDev;
1973
1974         /* If it is still linked into the bucket list, free from the list */
1975         if (!ylist_empty(&tn->hashLink)) {
1976                 ylist_del_init(&tn->hashLink);
1977                 bucket = yaffs_HashFunction(tn->objectId);
1978                 dev->objectBucket[bucket].count--;
1979         }
1980 }
1981
1982 /*  FreeObject frees up a Object and puts it back on the free list */
1983 static void yaffs_FreeObject(yaffs_Object *tn)
1984 {
1985         yaffs_Device *dev = tn->myDev;
1986
1987 #ifdef __KERNEL__
1988         T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
1989 #endif
1990
1991         if (tn->parent)
1992                 YBUG();
1993         if (!ylist_empty(&tn->siblings))
1994                 YBUG();
1995
1996
1997 #ifdef __KERNEL__
1998         if (tn->myInode) {
1999                 /* We're still hooked up to a cached inode.
2000                  * Don't delete now, but mark for later deletion
2001                  */
2002                 tn->deferedFree = 1;
2003                 return;
2004         }
2005 #endif
2006
2007         yaffs_UnhashObject(tn);
2008
2009 #ifdef VALGRIND_TEST
2010         YFREE(tn);
2011 #else
2012         /* Link into the free list. */
2013         tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2014         dev->freeObjects = tn;
2015         dev->nFreeObjects++;
2016 #endif
2017         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2018 }
2019
2020 #ifdef __KERNEL__
2021
2022 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2023 {
2024         if (obj->deferedFree)
2025                 yaffs_FreeObject(obj);
2026 }
2027
2028 #endif
2029
2030 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2031 {
2032         /* Free the list of allocated Objects */
2033
2034         yaffs_ObjectList *tmp;
2035
2036         while (dev->allocatedObjectList) {
2037                 tmp = dev->allocatedObjectList->next;
2038                 YFREE(dev->allocatedObjectList->objects);
2039                 YFREE(dev->allocatedObjectList);
2040
2041                 dev->allocatedObjectList = tmp;
2042         }
2043
2044         dev->freeObjects = NULL;
2045         dev->nFreeObjects = 0;
2046 }
2047
2048 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2049 {
2050         int i;
2051
2052         dev->allocatedObjectList = NULL;
2053         dev->freeObjects = NULL;
2054         dev->nFreeObjects = 0;
2055
2056         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2057                 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2058                 dev->objectBucket[i].count = 0;
2059         }
2060 }
2061
2062 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2063 {
2064         static int x;
2065         int i;
2066         int l = 999;
2067         int lowest = 999999;
2068
2069         /* First let's see if we can find one that's empty. */
2070
2071         for (i = 0; i < 10 && lowest > 0; i++) {
2072                 x++;
2073                 x %= YAFFS_NOBJECT_BUCKETS;
2074                 if (dev->objectBucket[x].count < lowest) {
2075                         lowest = dev->objectBucket[x].count;
2076                         l = x;
2077                 }
2078
2079         }
2080
2081         /* If we didn't find an empty list, then try
2082          * looking a bit further for a short one
2083          */
2084
2085         for (i = 0; i < 10 && lowest > 3; i++) {
2086                 x++;
2087                 x %= YAFFS_NOBJECT_BUCKETS;
2088                 if (dev->objectBucket[x].count < lowest) {
2089                         lowest = dev->objectBucket[x].count;
2090                         l = x;
2091                 }
2092
2093         }
2094
2095         return l;
2096 }
2097
2098 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2099 {
2100         int bucket = yaffs_FindNiceObjectBucket(dev);
2101
2102         /* Now find an object value that has not already been taken
2103          * by scanning the list.
2104          */
2105
2106         int found = 0;
2107         struct ylist_head *i;
2108
2109         __u32 n = (__u32) bucket;
2110
2111         /* yaffs_CheckObjectHashSanity();  */
2112
2113         while (!found) {
2114                 found = 1;
2115                 n += YAFFS_NOBJECT_BUCKETS;
2116                 if (1 || dev->objectBucket[bucket].count > 0) {
2117                         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2118                                 /* If there is already one in the list */
2119                                 if (i && ylist_entry(i, yaffs_Object,
2120                                                 hashLink)->objectId == n) {
2121                                         found = 0;
2122                                 }
2123                         }
2124                 }
2125         }
2126
2127         return n;
2128 }
2129
2130 static void yaffs_HashObject(yaffs_Object *in)
2131 {
2132         int bucket = yaffs_HashFunction(in->objectId);
2133         yaffs_Device *dev = in->myDev;
2134
2135         ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2136         dev->objectBucket[bucket].count++;
2137 }
2138
2139 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2140 {
2141         int bucket = yaffs_HashFunction(number);
2142         struct ylist_head *i;
2143         yaffs_Object *in;
2144
2145         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2146                 /* Look if it is in the list */
2147                 if (i) {
2148                         in = ylist_entry(i, yaffs_Object, hashLink);
2149                         if (in->objectId == number) {
2150 #ifdef __KERNEL__
2151                                 /* Don't tell the VFS about this one if it is defered free */
2152                                 if (in->deferedFree)
2153                                         return NULL;
2154 #endif
2155
2156                                 return in;
2157                         }
2158                 }
2159         }
2160
2161         return NULL;
2162 }
2163
2164 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2165                                     yaffs_ObjectType type)
2166 {
2167         yaffs_Object *theObject;
2168         yaffs_Tnode *tn = NULL;
2169
2170         if (number < 0)
2171                 number = yaffs_CreateNewObjectNumber(dev);
2172
2173         theObject = yaffs_AllocateEmptyObject(dev);
2174         if (!theObject)
2175                 return NULL;
2176
2177         if (type == YAFFS_OBJECT_TYPE_FILE) {
2178                 tn = yaffs_GetTnode(dev);
2179                 if (!tn) {
2180                         yaffs_FreeObject(theObject);
2181                         return NULL;
2182                 }
2183         }
2184
2185         if (theObject) {
2186                 theObject->fake = 0;
2187                 theObject->renameAllowed = 1;
2188                 theObject->unlinkAllowed = 1;
2189                 theObject->objectId = number;
2190                 yaffs_HashObject(theObject);
2191                 theObject->variantType = type;
2192 #ifdef CONFIG_YAFFS_WINCE
2193                 yfsd_WinFileTimeNow(theObject->win_atime);
2194                 theObject->win_ctime[0] = theObject->win_mtime[0] =
2195                     theObject->win_atime[0];
2196                 theObject->win_ctime[1] = theObject->win_mtime[1] =
2197                     theObject->win_atime[1];
2198
2199 #else
2200
2201                 theObject->yst_atime = theObject->yst_mtime =
2202                     theObject->yst_ctime = Y_CURRENT_TIME;
2203 #endif
2204                 switch (type) {
2205                 case YAFFS_OBJECT_TYPE_FILE:
2206                         theObject->variant.fileVariant.fileSize = 0;
2207                         theObject->variant.fileVariant.scannedFileSize = 0;
2208                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2209                         theObject->variant.fileVariant.topLevel = 0;
2210                         theObject->variant.fileVariant.top = tn;
2211                         break;
2212                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2213                         YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2214                                         children);
2215                         break;
2216                 case YAFFS_OBJECT_TYPE_SYMLINK:
2217                 case YAFFS_OBJECT_TYPE_HARDLINK:
2218                 case YAFFS_OBJECT_TYPE_SPECIAL:
2219                         /* No action required */
2220                         break;
2221                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2222                         /* todo this should not happen */
2223                         break;
2224                 }
2225         }
2226
2227         return theObject;
2228 }
2229
2230 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2231                                                       int number,
2232                                                       yaffs_ObjectType type)
2233 {
2234         yaffs_Object *theObject = NULL;
2235
2236         if (number > 0)
2237                 theObject = yaffs_FindObjectByNumber(dev, number);
2238
2239         if (!theObject)
2240                 theObject = yaffs_CreateNewObject(dev, number, type);
2241
2242         return theObject;
2243
2244 }
2245
2246
2247 static YCHAR *yaffs_CloneString(const YCHAR *str)
2248 {
2249         YCHAR *newStr = NULL;
2250
2251         if (str && *str) {
2252                 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2253                 if (newStr)
2254                         yaffs_strcpy(newStr, str);
2255         }
2256
2257         return newStr;
2258
2259 }
2260
2261 /*
2262  * Mknod (create) a new object.
2263  * equivalentObject only has meaning for a hard link;
2264  * aliasString only has meaning for a sumlink.
2265  * rdev only has meaning for devices (a subset of special objects)
2266  */
2267
2268 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2269                                        yaffs_Object *parent,
2270                                        const YCHAR *name,
2271                                        __u32 mode,
2272                                        __u32 uid,
2273                                        __u32 gid,
2274                                        yaffs_Object *equivalentObject,
2275                                        const YCHAR *aliasString, __u32 rdev)
2276 {
2277         yaffs_Object *in;
2278         YCHAR *str = NULL;
2279
2280         yaffs_Device *dev = parent->myDev;
2281
2282         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2283         if (yaffs_FindObjectByName(parent, name))
2284                 return NULL;
2285
2286         in = yaffs_CreateNewObject(dev, -1, type);
2287
2288         if (!in)
2289                 return YAFFS_FAIL;
2290
2291         if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2292                 str = yaffs_CloneString(aliasString);
2293                 if (!str) {
2294                         yaffs_FreeObject(in);
2295                         return NULL;
2296                 }
2297         }
2298
2299
2300
2301         if (in) {
2302                 in->hdrChunk = 0;
2303                 in->valid = 1;
2304                 in->variantType = type;
2305
2306                 in->yst_mode = mode;
2307
2308 #ifdef CONFIG_YAFFS_WINCE
2309                 yfsd_WinFileTimeNow(in->win_atime);
2310                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2311                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2312
2313 #else
2314                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2315
2316                 in->yst_rdev = rdev;
2317                 in->yst_uid = uid;
2318                 in->yst_gid = gid;
2319 #endif
2320                 in->nDataChunks = 0;
2321
2322                 yaffs_SetObjectName(in, name);
2323                 in->dirty = 1;
2324
2325                 yaffs_AddObjectToDirectory(parent, in);
2326
2327                 in->myDev = parent->myDev;
2328
2329                 switch (type) {
2330                 case YAFFS_OBJECT_TYPE_SYMLINK:
2331                         in->variant.symLinkVariant.alias = str;
2332                         break;
2333                 case YAFFS_OBJECT_TYPE_HARDLINK:
2334                         in->variant.hardLinkVariant.equivalentObject =
2335                                 equivalentObject;
2336                         in->variant.hardLinkVariant.equivalentObjectId =
2337                                 equivalentObject->objectId;
2338                         ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2339                         break;
2340                 case YAFFS_OBJECT_TYPE_FILE:
2341                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2342                 case YAFFS_OBJECT_TYPE_SPECIAL:
2343                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2344                         /* do nothing */
2345                         break;
2346                 }
2347
2348                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2349                         /* Could not create the object header, fail the creation */
2350                         yaffs_DeleteObject(in);
2351                         in = NULL;
2352                 }
2353
2354                 yaffs_UpdateParent(parent);
2355         }
2356
2357         return in;
2358 }
2359
2360 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2361                         __u32 mode, __u32 uid, __u32 gid)
2362 {
2363         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2364                                 uid, gid, NULL, NULL, 0);
2365 }
2366
2367 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2368                                 __u32 mode, __u32 uid, __u32 gid)
2369 {
2370         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2371                                  mode, uid, gid, NULL, NULL, 0);
2372 }
2373
2374 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2375                                 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2376 {
2377         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2378                                  uid, gid, NULL, NULL, rdev);
2379 }
2380
2381 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2382                                 __u32 mode, __u32 uid, __u32 gid,
2383                                 const YCHAR *alias)
2384 {
2385         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2386                                 uid, gid, NULL, alias, 0);
2387 }
2388
2389 /* yaffs_Link returns the object id of the equivalent object.*/
2390 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2391                         yaffs_Object *equivalentObject)
2392 {
2393         /* Get the real object in case we were fed a hard link as an equivalent object */
2394         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2395
2396         if (yaffs_MknodObject
2397             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2398              equivalentObject, NULL, 0)) {
2399                 return equivalentObject;
2400         } else {
2401                 return NULL;
2402         }
2403
2404 }
2405
2406 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2407                                 const YCHAR *newName, int force, int shadows)
2408 {
2409         int unlinkOp;
2410         int deleteOp;
2411
2412         yaffs_Object *existingTarget;
2413
2414         if (newDir == NULL)
2415                 newDir = obj->parent;   /* use the old directory */
2416
2417         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2418                 T(YAFFS_TRACE_ALWAYS,
2419                   (TSTR
2420                    ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2421                     TENDSTR)));
2422                 YBUG();
2423         }
2424
2425         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2426         if (obj->myDev->isYaffs2)
2427                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2428         else
2429                 unlinkOp = (newDir == obj->myDev->unlinkedDir
2430                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2431
2432         deleteOp = (newDir == obj->myDev->deletedDir);
2433
2434         existingTarget = yaffs_FindObjectByName(newDir, newName);
2435
2436         /* If the object is a file going into the unlinked directory,
2437          *   then it is OK to just stuff it in since duplicate names are allowed.
2438          *   else only proceed if the new name does not exist and if we're putting
2439          *   it into a directory.
2440          */
2441         if ((unlinkOp ||
2442              deleteOp ||
2443              force ||
2444              (shadows > 0) ||
2445              !existingTarget) &&
2446             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2447                 yaffs_SetObjectName(obj, newName);
2448                 obj->dirty = 1;
2449
2450                 yaffs_AddObjectToDirectory(newDir, obj);
2451
2452                 if (unlinkOp)
2453                         obj->unlinked = 1;
2454
2455                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2456                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2457                         return YAFFS_OK;
2458         }
2459
2460         return YAFFS_FAIL;
2461 }
2462
2463 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2464                 yaffs_Object *newDir, const YCHAR *newName)
2465 {
2466         yaffs_Object *obj = NULL;
2467         yaffs_Object *existingTarget = NULL;
2468         int force = 0;
2469         int result;
2470         yaffs_Device *dev;
2471
2472
2473         if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2474                 YBUG();
2475         if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2476                 YBUG();
2477
2478         dev = oldDir->myDev;
2479
2480 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2481         /* Special case for case insemsitive systems (eg. WinCE).
2482          * While look-up is case insensitive, the name isn't.
2483          * Therefore we might want to change x.txt to X.txt
2484         */
2485         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2486                 force = 1;
2487 #endif
2488
2489         if(yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2490                 /* ENAMETOOLONG */
2491                 return YAFFS_FAIL;
2492
2493         obj = yaffs_FindObjectByName(oldDir, oldName);
2494
2495         if (obj && obj->renameAllowed) {
2496
2497                 /* Now do the handling for an existing target, if there is one */
2498
2499                 existingTarget = yaffs_FindObjectByName(newDir, newName);
2500                 if (existingTarget &&
2501                         existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2502                         !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2503                         /* There is a target that is a non-empty directory, so we fail */
2504                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
2505                 } else if (existingTarget && existingTarget != obj) {
2506                         /* Nuke the target first, using shadowing,
2507                          * but only if it isn't the same object.
2508                          *
2509                          * Note we must disable gc otherwise it can mess up the shadowing.
2510                          *
2511                          */
2512                         dev->isDoingGC=1;
2513                         yaffs_ChangeObjectName(obj, newDir, newName, force,
2514                                                 existingTarget->objectId);
2515                         existingTarget->isShadowed = 1;
2516                         yaffs_UnlinkObject(existingTarget);
2517                         dev->isDoingGC=0;
2518                 }
2519
2520                 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2521
2522                 yaffs_UpdateParent(oldDir);
2523                 if(newDir != oldDir)
2524                         yaffs_UpdateParent(newDir);
2525
2526                 return result;
2527         }
2528         return YAFFS_FAIL;
2529 }
2530
2531 /*------------------------- Block Management and Page Allocation ----------------*/
2532
2533 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2534 {
2535         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2536
2537         dev->blockInfo = NULL;
2538         dev->chunkBits = NULL;
2539
2540         dev->allocationBlock = -1;      /* force it to get a new one */
2541
2542         /* If the first allocation strategy fails, thry the alternate one */
2543         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2544         if (!dev->blockInfo) {
2545                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2546                 dev->blockInfoAlt = 1;
2547         } else
2548                 dev->blockInfoAlt = 0;
2549
2550         if (dev->blockInfo) {
2551                 /* Set up dynamic blockinfo stuff. */
2552                 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2553                 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2554                 if (!dev->chunkBits) {
2555                         dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2556                         dev->chunkBitsAlt = 1;
2557                 } else
2558                         dev->chunkBitsAlt = 0;
2559         }
2560
2561         if (dev->blockInfo && dev->chunkBits) {
2562                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2563                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2564                 return YAFFS_OK;
2565         }
2566
2567         return YAFFS_FAIL;
2568 }
2569
2570 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2571 {
2572         if (dev->blockInfoAlt && dev->blockInfo)
2573                 YFREE_ALT(dev->blockInfo);
2574         else if (dev->blockInfo)
2575                 YFREE(dev->blockInfo);
2576
2577         dev->blockInfoAlt = 0;
2578
2579         dev->blockInfo = NULL;
2580
2581         if (dev->chunkBitsAlt && dev->chunkBits)
2582                 YFREE_ALT(dev->chunkBits);
2583         else if (dev->chunkBits)
2584                 YFREE(dev->chunkBits);
2585         dev->chunkBitsAlt = 0;
2586         dev->chunkBits = NULL;
2587 }
2588
2589 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2590                                         yaffs_BlockInfo *bi)
2591 {
2592         int i;
2593         __u32 seq;
2594         yaffs_BlockInfo *b;
2595
2596         if (!dev->isYaffs2)
2597                 return 1;       /* disqualification only applies to yaffs2. */
2598
2599         if (!bi->hasShrinkHeader)
2600                 return 1;       /* can gc */
2601
2602         /* Find the oldest dirty sequence number if we don't know it and save it
2603          * so we don't have to keep recomputing it.
2604          */
2605         if (!dev->oldestDirtySequence) {
2606                 seq = dev->sequenceNumber;
2607
2608                 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2609                                 i++) {
2610                         b = yaffs_GetBlockInfo(dev, i);
2611                         if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2612                             (b->pagesInUse - b->softDeletions) <
2613                             dev->nChunksPerBlock && b->sequenceNumber < seq) {
2614                                 seq = b->sequenceNumber;
2615                         }
2616                 }
2617                 dev->oldestDirtySequence = seq;
2618         }
2619
2620         /* Can't do gc of this block if there are any blocks older than this one that have
2621          * discarded pages.
2622          */
2623         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2624 }
2625
2626 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2627  * for garbage collection.
2628  */
2629
2630 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2631                                         int aggressive)
2632 {
2633         int b = dev->currentDirtyChecker;
2634
2635         int i;
2636         int iterations;
2637         int dirtiest = -1;
2638         int pagesInUse = 0;
2639         int prioritised = 0;
2640         yaffs_BlockInfo *bi;
2641         int pendingPrioritisedExist = 0;
2642
2643         /* First let's see if we need to grab a prioritised block */
2644         if (dev->hasPendingPrioritisedGCs) {
2645                 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2646
2647                         bi = yaffs_GetBlockInfo(dev, i);
2648                         /* yaffs_VerifyBlock(dev,bi,i); */
2649
2650                         if (bi->gcPrioritise) {
2651                                 pendingPrioritisedExist = 1;
2652                                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2653                                    yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2654                                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2655                                         dirtiest = i;
2656                                         prioritised = 1;
2657                                         aggressive = 1; /* Fool the non-aggressive skip logiv below */
2658                                 }
2659                         }
2660                 }
2661
2662                 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2663                         dev->hasPendingPrioritisedGCs = 0;
2664         }
2665
2666         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2667          * search harder.
2668          * else (we're doing a leasurely gc), then we only bother to do this if the
2669          * block has only a few pages in use.
2670          */
2671
2672         dev->nonAggressiveSkip--;
2673
2674         if (!aggressive && (dev->nonAggressiveSkip > 0))
2675                 return -1;
2676
2677         if (!prioritised)
2678                 pagesInUse =
2679                         (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2680
2681         if (aggressive)
2682                 iterations =
2683                     dev->internalEndBlock - dev->internalStartBlock + 1;
2684         else {
2685                 iterations =
2686                     dev->internalEndBlock - dev->internalStartBlock + 1;
2687                 iterations = iterations / 16;
2688                 if (iterations > 200)
2689                         iterations = 200;
2690         }
2691
2692         for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2693                 b++;
2694                 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2695                         b = dev->internalStartBlock;
2696
2697                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2698                         T(YAFFS_TRACE_ERROR,
2699                           (TSTR("**>> Block %d is not valid" TENDSTR), b));
2700                         YBUG();
2701                 }
2702
2703                 bi = yaffs_GetBlockInfo(dev, b);
2704
2705                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2706                         (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2707                                 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2708                         dirtiest = b;
2709                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2710                 }
2711         }
2712
2713         dev->currentDirtyChecker = b;
2714
2715         if (dirtiest > 0) {
2716                 T(YAFFS_TRACE_GC,
2717                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2718                    dev->nChunksPerBlock - pagesInUse, prioritised));
2719         }
2720
2721         dev->oldestDirtySequence = 0;
2722
2723         if (dirtiest > 0)
2724                 dev->nonAggressiveSkip = 4;
2725
2726         return dirtiest;
2727 }
2728
2729 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2730 {
2731         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2732
2733         int erasedOk = 0;
2734
2735         /* If the block is still healthy erase it and mark as clean.
2736          * If the block has had a data failure, then retire it.
2737          */
2738
2739         T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2740                 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2741                 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2742
2743         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2744
2745         if (!bi->needsRetiring) {
2746                 yaffs_InvalidateCheckpoint(dev);
2747                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2748                 if (!erasedOk) {
2749                         dev->nErasureFailures++;
2750                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2751                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2752                 }
2753         }
2754
2755         if (erasedOk &&
2756             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2757                 int i;
2758                 for (i = 0; i < dev->nChunksPerBlock; i++) {
2759                         if (!yaffs_CheckChunkErased
2760                             (dev, blockNo * dev->nChunksPerBlock + i)) {
2761                                 T(YAFFS_TRACE_ERROR,
2762                                   (TSTR
2763                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2764                                     TENDSTR), blockNo, i));
2765                         }
2766                 }
2767         }
2768
2769         if (erasedOk) {
2770                 /* Clean it up... */
2771                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2772                 dev->nErasedBlocks++;
2773                 bi->pagesInUse = 0;
2774                 bi->softDeletions = 0;
2775                 bi->hasShrinkHeader = 0;
2776                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2777                 bi->gcPrioritise = 0;
2778                 yaffs_ClearChunkBits(dev, blockNo);
2779
2780                 T(YAFFS_TRACE_ERASE,
2781                   (TSTR("Erased block %d" TENDSTR), blockNo));
2782         } else {
2783                 dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
2784
2785                 yaffs_RetireBlock(dev, blockNo);
2786                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2787                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2788         }
2789 }
2790
2791 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2792 {
2793         int i;
2794
2795         yaffs_BlockInfo *bi;
2796
2797         if (dev->nErasedBlocks < 1) {
2798                 /* Hoosterman we've got a problem.
2799                  * Can't get space to gc
2800                  */
2801                 T(YAFFS_TRACE_ERROR,
2802                   (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2803
2804                 return -1;
2805         }
2806
2807         /* Find an empty block. */
2808
2809         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2810                 dev->allocationBlockFinder++;
2811                 if (dev->allocationBlockFinder < dev->internalStartBlock
2812                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2813                         dev->allocationBlockFinder = dev->internalStartBlock;
2814                 }
2815
2816                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2817
2818                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2819                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2820                         dev->sequenceNumber++;
2821                         bi->sequenceNumber = dev->sequenceNumber;
2822                         dev->nErasedBlocks--;
2823                         T(YAFFS_TRACE_ALLOCATE,
2824                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2825                            dev->allocationBlockFinder, dev->sequenceNumber,
2826                            dev->nErasedBlocks));
2827                         return dev->allocationBlockFinder;
2828                 }
2829         }
2830
2831         T(YAFFS_TRACE_ALWAYS,
2832           (TSTR
2833            ("yaffs tragedy: no more erased blocks, but there should have been %d"
2834             TENDSTR), dev->nErasedBlocks));
2835
2836         return -1;
2837 }
2838
2839
2840
2841 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2842 {
2843         if (!dev->nCheckpointBlocksRequired &&
2844            dev->isYaffs2) {
2845                 /* Not a valid value so recalculate */
2846                 int nBytes = 0;
2847                 int nBlocks;
2848                 int devBlocks = (dev->endBlock - dev->startBlock + 1);
2849                 int tnodeSize;
2850
2851                 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
2852
2853                 if (tnodeSize < sizeof(yaffs_Tnode))
2854                         tnodeSize = sizeof(yaffs_Tnode);
2855
2856                 nBytes += sizeof(yaffs_CheckpointValidity);
2857                 nBytes += sizeof(yaffs_CheckpointDevice);
2858                 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2859                 nBytes += devBlocks * dev->chunkBitmapStride;
2860                 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2861                 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2862                 nBytes += sizeof(yaffs_CheckpointValidity);
2863                 nBytes += sizeof(__u32); /* checksum*/
2864
2865                 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2866
2867                 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
2868
2869                 dev->nCheckpointBlocksRequired = nBlocks;
2870         }
2871
2872         return dev->nCheckpointBlocksRequired;
2873 }
2874
2875 /*
2876  * Check if there's space to allocate...
2877  * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2878  */
2879 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
2880 {
2881         int reservedChunks;
2882         int reservedBlocks = dev->nReservedBlocks;
2883         int checkpointBlocks;
2884
2885         if (dev->isYaffs2) {
2886                 checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
2887                                     dev->blocksInCheckpoint;
2888                 if (checkpointBlocks < 0)
2889                         checkpointBlocks = 0;
2890         } else {
2891                 checkpointBlocks = 0;
2892         }
2893
2894         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2895
2896         return (dev->nFreeChunks > reservedChunks);
2897 }
2898
2899 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
2900                 yaffs_BlockInfo **blockUsedPtr)
2901 {
2902         int retVal;
2903         yaffs_BlockInfo *bi;
2904
2905         if (dev->allocationBlock < 0) {
2906                 /* Get next block to allocate off */
2907                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2908                 dev->allocationPage = 0;
2909         }
2910
2911         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2912                 /* Not enough space to allocate unless we're allowed to use the reserve. */
2913                 return -1;
2914         }
2915
2916         if (dev->nErasedBlocks < dev->nReservedBlocks
2917                         && dev->allocationPage == 0) {
2918                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2919         }
2920
2921         /* Next page please.... */
2922         if (dev->allocationBlock >= 0) {
2923                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2924
2925                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2926                         dev->allocationPage;
2927                 bi->pagesInUse++;
2928                 yaffs_SetChunkBit(dev, dev->allocationBlock,
2929                                 dev->allocationPage);
2930
2931                 dev->allocationPage++;
2932
2933                 dev->nFreeChunks--;
2934
2935                 /* If the block is full set the state to full */
2936                 if (dev->allocationPage >= dev->nChunksPerBlock) {
2937                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2938                         dev->allocationBlock = -1;
2939                 }
2940
2941                 if (blockUsedPtr)
2942                         *blockUsedPtr = bi;
2943
2944                 return retVal;
2945         }
2946
2947         T(YAFFS_TRACE_ERROR,
2948                         (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2949
2950         return -1;
2951 }
2952
2953 static int yaffs_GetErasedChunks(yaffs_Device *dev)
2954 {
2955         int n;
2956
2957         n = dev->nErasedBlocks * dev->nChunksPerBlock;
2958
2959         if (dev->allocationBlock > 0)
2960                 n += (dev->nChunksPerBlock - dev->allocationPage);
2961
2962         return n;
2963
2964 }
2965
2966 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
2967                 int wholeBlock)
2968 {
2969         int oldChunk;
2970         int newChunk;
2971         int markNAND;
2972         int retVal = YAFFS_OK;
2973         int cleanups = 0;
2974         int i;
2975         int isCheckpointBlock;
2976         int matchingChunk;
2977         int maxCopies;
2978
2979         int chunksBefore = yaffs_GetErasedChunks(dev);
2980         int chunksAfter;
2981
2982         yaffs_ExtendedTags tags;
2983
2984         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2985
2986         yaffs_Object *object;
2987
2988         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2989
2990
2991         T(YAFFS_TRACE_TRACING,
2992                         (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
2993                          block,
2994                          bi->pagesInUse,
2995                          bi->hasShrinkHeader,
2996                          wholeBlock));
2997
2998         /*yaffs_VerifyFreeChunks(dev); */
2999
3000         if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3001                 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3002
3003         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
3004
3005         /* Take off the number of soft deleted entries because
3006          * they're going to get really deleted during GC.
3007          */
3008         if(dev->gcChunk == 0) /* first time through for this block */
3009                 dev->nFreeChunks -= bi->softDeletions;
3010
3011         dev->isDoingGC = 1;
3012
3013         if (isCheckpointBlock ||
3014                         !yaffs_StillSomeChunkBits(dev, block)) {
3015                 T(YAFFS_TRACE_TRACING,
3016                                 (TSTR
3017                                  ("Collecting block %d that has no chunks in use" TENDSTR),
3018                                  block));
3019                 yaffs_BlockBecameDirty(dev, block);
3020         } else {
3021
3022                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3023
3024                 yaffs_VerifyBlock(dev, bi, block);
3025
3026                 maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
3027                 oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
3028
3029                 for (/* init already done */;
3030                      retVal == YAFFS_OK &&
3031                      dev->gcChunk < dev->nChunksPerBlock &&
3032                      (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3033                      maxCopies > 0;
3034                      dev->gcChunk++, oldChunk++) {
3035                         if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3036
3037                                 /* This page is in use and might need to be copied off */
3038
3039                                 maxCopies--;
3040
3041                                 markNAND = 1;
3042
3043                                 yaffs_InitialiseTags(&tags);
3044
3045                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3046                                                                 buffer, &tags);
3047
3048                                 object =
3049                                     yaffs_FindObjectByNumber(dev,
3050                                                              tags.objectId);
3051
3052                                 T(YAFFS_TRACE_GC_DETAIL,
3053                                   (TSTR
3054                                    ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3055                                    dev->gcChunk, tags.objectId, tags.chunkId,
3056                                    tags.byteCount));
3057
3058                                 if (object && !yaffs_SkipVerification(dev)) {
3059                                         if (tags.chunkId == 0)
3060                                                 matchingChunk = object->hdrChunk;
3061                                         else if (object->softDeleted)
3062                                                 matchingChunk = oldChunk; /* Defeat the test */
3063                                         else
3064                                                 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3065
3066                                         if (oldChunk != matchingChunk)
3067                                                 T(YAFFS_TRACE_ERROR,
3068                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3069                                                   oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3070
3071                                 }
3072
3073                                 if (!object) {
3074                                         T(YAFFS_TRACE_ERROR,
3075                                           (TSTR
3076                                            ("page %d in gc has no object: %d %d %d "
3077                                             TENDSTR), oldChunk,
3078                                             tags.objectId, tags.chunkId, tags.byteCount));
3079                                 }
3080
3081                                 if (object &&
3082                                     object->deleted &&
3083                                     object->softDeleted &&
3084                                     tags.chunkId != 0) {
3085                                         /* Data chunk in a soft deleted file, throw it away
3086                                          * It's a soft deleted data chunk,
3087                                          * No need to copy this, just forget about it and
3088                                          * fix up the object.
3089                                          */
3090
3091                                         object->nDataChunks--;
3092
3093                                         if (object->nDataChunks <= 0) {
3094                                                 /* remeber to clean up the object */
3095                                                 dev->gcCleanupList[cleanups] =
3096                                                     tags.objectId;
3097                                                 cleanups++;
3098                                         }
3099                                         markNAND = 0;
3100                                 } else if (0) {
3101                                         /* Todo object && object->deleted && object->nDataChunks == 0 */
3102                                         /* Deleted object header with no data chunks.
3103                                          * Can be discarded and the file deleted.
3104                                          */
3105                                         object->hdrChunk = 0;
3106                                         yaffs_FreeTnode(object->myDev,
3107                                                         object->variant.
3108                                                         fileVariant.top);
3109                                         object->variant.fileVariant.top = NULL;
3110                                         yaffs_DoGenericObjectDeletion(object);
3111
3112                                 } else if (object) {
3113                                         /* It's either a data chunk in a live file or
3114                                          * an ObjectHeader, so we're interested in it.
3115                                          * NB Need to keep the ObjectHeaders of deleted files
3116                                          * until the whole file has been deleted off
3117                                          */
3118                                         tags.serialNumber++;
3119
3120                                         dev->nGCCopies++;
3121
3122                                         if (tags.chunkId == 0) {
3123                                                 /* It is an object Id,
3124                                                  * We need to nuke the shrinkheader flags first
3125                                                  * We no longer want the shrinkHeader flag since its work is done
3126                                                  * and if it is left in place it will mess up scanning.
3127                                                  */
3128
3129                                                 yaffs_ObjectHeader *oh;
3130                                                 oh = (yaffs_ObjectHeader *)buffer;
3131                                                 oh->isShrink = 0;
3132                                                 tags.extraIsShrinkHeader = 0;
3133
3134                                                 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3135                                         }
3136
3137                                         newChunk =
3138                                             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3139
3140                                         if (newChunk < 0) {
3141                                                 retVal = YAFFS_FAIL;
3142                                         } else {
3143
3144                                                 /* Ok, now fix up the Tnodes etc. */
3145
3146                                                 if (tags.chunkId == 0) {
3147                                                         /* It's a header */
3148                                                         object->hdrChunk =  newChunk;
3149                                                         object->serial =   tags.serialNumber;
3150                                                 } else {
3151                                                         /* It's a data chunk */
3152                                                         yaffs_PutChunkIntoFile
3153                                                             (object,
3154                                                              tags.chunkId,
3155                                                              newChunk, 0);
3156                                                 }
3157                                         }
3158                                 }
3159
3160                                 if (retVal == YAFFS_OK)
3161                                         yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3162
3163                         }
3164                 }
3165
3166                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3167
3168
3169                 /* Do any required cleanups */
3170                 for (i = 0; i < cleanups; i++) {
3171                         /* Time to delete the file too */
3172                         object =
3173                             yaffs_FindObjectByNumber(dev,
3174                                                      dev->gcCleanupList[i]);
3175                         if (object) {
3176                                 yaffs_FreeTnode(dev,
3177                                                 object->variant.fileVariant.
3178                                                 top);
3179                                 object->variant.fileVariant.top = NULL;
3180                                 T(YAFFS_TRACE_GC,
3181                                   (TSTR
3182                                    ("yaffs: About to finally delete object %d"
3183                                     TENDSTR), object->objectId));
3184                                 yaffs_DoGenericObjectDeletion(object);
3185                                 object->myDev->nDeletedFiles--;
3186                         }
3187
3188                 }
3189
3190         }
3191
3192         yaffs_VerifyCollectedBlock(dev, bi, block);
3193
3194         chunksAfter = yaffs_GetErasedChunks(dev);
3195         if (chunksBefore >= chunksAfter) {
3196                 T(YAFFS_TRACE_GC,
3197                   (TSTR
3198                    ("gc did not increase free chunks before %d after %d"
3199                     TENDSTR), chunksBefore, chunksAfter));
3200         }
3201
3202         /* If the gc completed then clear the current gcBlock so that we find another. */
3203         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3204                 dev->gcBlock = -1;
3205                 dev->gcChunk = 0;
3206         }
3207
3208         dev->isDoingGC = 0;
3209
3210         return retVal;
3211 }
3212
3213 /* New garbage collector
3214  * If we're very low on erased blocks then we do aggressive garbage collection
3215  * otherwise we do "leasurely" garbage collection.
3216  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3217  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3218  *
3219  * The idea is to help clear out space in a more spread-out manner.
3220  * Dunno if it really does anything useful.
3221  */
3222 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3223 {
3224         int block;
3225         int aggressive;
3226         int gcOk = YAFFS_OK;
3227         int maxTries = 0;
3228
3229         int checkpointBlockAdjust;
3230
3231         if (dev->isDoingGC) {
3232                 /* Bail out so we don't get recursive gc */
3233                 return YAFFS_OK;
3234         }
3235
3236         /* This loop should pass the first time.
3237          * We'll only see looping here if the erase of the collected block fails.
3238          */
3239
3240         do {
3241                 maxTries++;
3242
3243                 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3244                 if (checkpointBlockAdjust < 0)
3245                         checkpointBlockAdjust = 0;
3246
3247                 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3248                         /* We need a block soon...*/
3249                         aggressive = 1;
3250                 } else {
3251                         /* We're in no hurry */
3252                         aggressive = 0;
3253                 }
3254
3255                 if (dev->gcBlock <= 0) {
3256                         dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3257                         dev->gcChunk = 0;
3258                 }
3259
3260                 block = dev->gcBlock;
3261
3262                 if (block > 0) {
3263                         dev->garbageCollections++;
3264                         if (!aggressive)
3265                                 dev->passiveGarbageCollections++;
3266
3267                         T(YAFFS_TRACE_GC,
3268                           (TSTR
3269                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3270                            dev->nErasedBlocks, aggressive));
3271
3272                         gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3273                 }
3274
3275                 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3276                         T(YAFFS_TRACE_GC,
3277                           (TSTR
3278                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3279                             TENDSTR), dev->nErasedBlocks, maxTries, block));
3280                 }
3281         } while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
3282                  (block > 0) &&
3283                  (maxTries < 2));
3284
3285         return aggressive ? gcOk : YAFFS_OK;
3286 }
3287
3288 /*-------------------------  TAGS --------------------------------*/
3289
3290 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3291                            int chunkInObject)
3292 {
3293         return (tags->chunkId == chunkInObject &&
3294                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3295
3296 }
3297
3298
3299 /*-------------------- Data file manipulation -----------------*/
3300
3301 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3302                                  yaffs_ExtendedTags *tags)
3303 {
3304         /*Get the Tnode, then get the level 0 offset chunk offset */
3305         yaffs_Tnode *tn;
3306         int theChunk = -1;
3307         yaffs_ExtendedTags localTags;
3308         int retVal = -1;
3309
3310         yaffs_Device *dev = in->myDev;
3311
3312         if (!tags) {
3313                 /* Passed a NULL, so use our own tags space */
3314                 tags = &localTags;
3315         }
3316
3317         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3318
3319         if (tn) {
3320                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3321
3322                 retVal =
3323                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3324                                            chunkInInode);
3325         }
3326         return retVal;
3327 }
3328
3329 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3330                                           yaffs_ExtendedTags *tags)
3331 {
3332         /* Get the Tnode, then get the level 0 offset chunk offset */
3333         yaffs_Tnode *tn;
3334         int theChunk = -1;
3335         yaffs_ExtendedTags localTags;
3336
3337         yaffs_Device *dev = in->myDev;
3338         int retVal = -1;
3339
3340         if (!tags) {
3341                 /* Passed a NULL, so use our own tags space */
3342                 tags = &localTags;
3343         }
3344
3345         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3346
3347         if (tn) {
3348
3349                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3350
3351                 retVal =
3352                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3353                                            chunkInInode);
3354
3355                 /* Delete the entry in the filestructure (if found) */
3356                 if (retVal != -1)
3357                         yaffs_PutLevel0Tnode(dev, tn, chunkInInode, 0);
3358         }
3359
3360         return retVal;
3361 }
3362
3363 #ifdef YAFFS_PARANOID
3364
3365 static int yaffs_CheckFileSanity(yaffs_Object *in)
3366 {
3367         int chunk;
3368         int nChunks;
3369         int fSize;
3370         int failed = 0;
3371         int objId;
3372         yaffs_Tnode *tn;
3373         yaffs_Tags localTags;
3374         yaffs_Tags *tags = &localTags;
3375         int theChunk;
3376         int chunkDeleted;
3377
3378         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3379                 return YAFFS_FAIL;
3380
3381         objId = in->objectId;
3382         fSize = in->variant.fileVariant.fileSize;
3383         nChunks =
3384             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3385
3386         for (chunk = 1; chunk <= nChunks; chunk++) {
3387                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3388                                            chunk);
3389
3390                 if (tn) {
3391
3392                         theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3393
3394                         if (yaffs_CheckChunkBits
3395                             (dev, theChunk / dev->nChunksPerBlock,
3396                              theChunk % dev->nChunksPerBlock)) {
3397
3398                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3399                                                             tags,
3400                                                             &chunkDeleted);
3401                                 if (yaffs_TagsMatch
3402                                     (tags, in->objectId, chunk, chunkDeleted)) {
3403                                         /* found it; */
3404
3405                                 }
3406                         } else {
3407
3408                                 failed = 1;
3409                         }
3410
3411                 } else {
3412                         /* T(("No level 0 found for %d\n", chunk)); */
3413                 }
3414         }
3415
3416         return failed ? YAFFS_FAIL : YAFFS_OK;
3417 }
3418
3419 #endif
3420
3421 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3422                                   int chunkInNAND, int inScan)
3423 {
3424         /* NB inScan is zero unless scanning.
3425          * For forward scanning, inScan is > 0;
3426          * for backward scanning inScan is < 0
3427          */
3428
3429         yaffs_Tnode *tn;
3430         yaffs_Device *dev = in->myDev;
3431         int existingChunk;
3432         yaffs_ExtendedTags existingTags;
3433         yaffs_ExtendedTags newTags;
3434         unsigned existingSerial, newSerial;
3435
3436         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3437                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3438                  * If it is not during Scanning then something went wrong!
3439                  */
3440                 if (!inScan) {
3441                         T(YAFFS_TRACE_ERROR,
3442                           (TSTR
3443                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3444                             TENDSTR)));
3445                         YBUG();
3446                 }
3447
3448                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3449                 return YAFFS_OK;
3450         }
3451
3452         tn = yaffs_AddOrFindLevel0Tnode(dev,
3453                                         &in->variant.fileVariant,
3454                                         chunkInInode,
3455                                         NULL);
3456         if (!tn)
3457                 return YAFFS_FAIL;
3458
3459         existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3460
3461         if (inScan != 0) {
3462                 /* If we're scanning then we need to test for duplicates
3463                  * NB This does not need to be efficient since it should only ever
3464                  * happen when the power fails during a write, then only one
3465                  * chunk should ever be affected.
3466                  *
3467                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3468                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3469                  */
3470
3471                 if (existingChunk > 0) {
3472                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3473                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3474                          *
3475                          * We have a duplicate now we need to decide which one to use:
3476                          *
3477                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3478                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3479                          * YAFFS1: Get both sets of tags and compare serial numbers.
3480                          */
3481
3482                         if (inScan > 0) {
3483                                 /* Only do this for forward scanning */
3484                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3485                                                                 chunkInNAND,
3486                                                                 NULL, &newTags);
3487
3488                                 /* Do a proper find */
3489                                 existingChunk =
3490                                     yaffs_FindChunkInFile(in, chunkInInode,
3491                                                           &existingTags);
3492                         }
3493
3494                         if (existingChunk <= 0) {
3495                                 /*Hoosterman - how did this happen? */
3496
3497                                 T(YAFFS_TRACE_ERROR,
3498                                   (TSTR
3499                                    ("yaffs tragedy: existing chunk < 0 in scan"
3500                                     TENDSTR)));
3501
3502                         }
3503
3504                         /* NB The deleted flags should be false, otherwise the chunks will
3505                          * not be loaded during a scan
3506                          */
3507
3508                         if (inScan > 0) {
3509                                 newSerial = newTags.serialNumber;
3510                                 existingSerial = existingTags.serialNumber;
3511                         }
3512
3513                         if ((inScan > 0) &&
3514                             (in->myDev->isYaffs2 ||
3515                              existingChunk <= 0 ||
3516                              ((existingSerial + 1) & 3) == newSerial)) {
3517                                 /* Forward scanning.
3518                                  * Use new
3519                                  * Delete the old one and drop through to update the tnode
3520                                  */
3521                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3522                                                   __LINE__);
3523                         } else {
3524                                 /* Backward scanning or we want to use the existing one
3525                                  * Use existing.
3526                                  * Delete the new one and return early so that the tnode isn't changed
3527                                  */
3528                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3529                                                   __LINE__);
3530                                 return YAFFS_OK;
3531                         }
3532                 }
3533
3534         }
3535
3536         if (existingChunk == 0)
3537                 in->nDataChunks++;
3538
3539         yaffs_PutLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3540
3541         return YAFFS_OK;
3542 }
3543
3544 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3545                                         __u8 *buffer)
3546 {
3547         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3548
3549         if (chunkInNAND >= 0)
3550                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3551                                                 buffer, NULL);
3552         else {
3553                 T(YAFFS_TRACE_NANDACCESS,
3554                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3555                    chunkInNAND));
3556                 /* get sane (zero) data if you read a hole */
3557                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3558                 return 0;
3559         }
3560
3561 }
3562
3563 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3564 {
3565         int block;
3566         int page;
3567         yaffs_ExtendedTags tags;
3568         yaffs_BlockInfo *bi;
3569
3570         if (chunkId <= 0)
3571                 return;
3572
3573         dev->nDeletions++;
3574         block = chunkId / dev->nChunksPerBlock;
3575         page = chunkId % dev->nChunksPerBlock;
3576
3577
3578         if (!yaffs_CheckChunkBit(dev, block, page))
3579                 T(YAFFS_TRACE_VERIFY,
3580                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3581                          chunkId));
3582
3583         bi = yaffs_GetBlockInfo(dev, block);
3584
3585         T(YAFFS_TRACE_DELETION,
3586           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3587
3588         if (markNAND &&
3589             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3590
3591                 yaffs_InitialiseTags(&tags);
3592
3593                 tags.chunkDeleted = 1;
3594
3595                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3596                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3597         } else {
3598                 dev->nUnmarkedDeletions++;
3599         }
3600
3601         /* Pull out of the management area.
3602          * If the whole block became dirty, this will kick off an erasure.
3603          */
3604         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3605             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3606             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3607             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3608                 dev->nFreeChunks++;
3609
3610                 yaffs_ClearChunkBit(dev, block, page);
3611
3612                 bi->pagesInUse--;
3613
3614                 if (bi->pagesInUse == 0 &&
3615                     !bi->hasShrinkHeader &&
3616                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3617                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3618                         yaffs_BlockBecameDirty(dev, block);
3619                 }
3620
3621         }
3622
3623 }
3624
3625 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3626                                         const __u8 *buffer, int nBytes,
3627                                         int useReserve)
3628 {
3629         /* Find old chunk Need to do this to get serial number
3630          * Write new one and patch into tree.
3631          * Invalidate old tags.
3632          */
3633
3634         int prevChunkId;
3635         yaffs_ExtendedTags prevTags;
3636
3637         int newChunkId;
3638         yaffs_ExtendedTags newTags;
3639
3640         yaffs_Device *dev = in->myDev;
3641
3642         yaffs_CheckGarbageCollection(dev);
3643
3644         /* Get the previous chunk at this location in the file if it exists */
3645         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3646
3647         /* Set up new tags */
3648         yaffs_InitialiseTags(&newTags);
3649
3650         newTags.chunkId = chunkInInode;
3651         newTags.objectId = in->objectId;
3652         newTags.serialNumber =
3653             (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3654         newTags.byteCount = nBytes;
3655
3656         if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
3657                 T(YAFFS_TRACE_ERROR,
3658                 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3659                 YBUG();
3660         }
3661
3662         newChunkId =
3663             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3664                                               useReserve);
3665
3666         if (newChunkId >= 0) {
3667                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3668
3669                 if (prevChunkId > 0)
3670                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3671
3672                 yaffs_CheckFileSanity(in);
3673         }
3674         return newChunkId;
3675
3676 }
3677
3678 /* UpdateObjectHeader updates the header on NAND for an object.
3679  * If name is not NULL, then that new name is used.
3680  */
3681 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3682                              int isShrink, int shadows)
3683 {
3684
3685         yaffs_BlockInfo *bi;
3686
3687         yaffs_Device *dev = in->myDev;
3688
3689         int prevChunkId;
3690         int retVal = 0;
3691         int result = 0;
3692
3693         int newChunkId;
3694         yaffs_ExtendedTags newTags;
3695         yaffs_ExtendedTags oldTags;
3696
3697         __u8 *buffer = NULL;
3698         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3699
3700         yaffs_ObjectHeader *oh = NULL;
3701
3702         yaffs_strcpy(oldName, _Y("silly old name"));
3703
3704
3705         if (!in->fake ||
3706                 in == dev->rootDir || /* The rootDir should also be saved */
3707                 force) {
3708
3709                 yaffs_CheckGarbageCollection(dev);
3710                 yaffs_CheckObjectDetailsLoaded(in);
3711
3712                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3713                 oh = (yaffs_ObjectHeader *) buffer;
3714
3715                 prevChunkId = in->hdrChunk;
3716
3717                 if (prevChunkId > 0) {
3718                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3719                                                         buffer, &oldTags);
3720
3721                         yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3722
3723                         memcpy(oldName, oh->name, sizeof(oh->name));
3724                 }
3725
3726                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3727
3728                 oh->type = in->variantType;
3729                 oh->yst_mode = in->yst_mode;
3730                 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3731
3732 #ifdef CONFIG_YAFFS_WINCE
3733                 oh->win_atime[0] = in->win_atime[0];
3734                 oh->win_ctime[0] = in->win_ctime[0];
3735                 oh->win_mtime[0] = in->win_mtime[0];
3736                 oh->win_atime[1] = in->win_atime[1];
3737                 oh->win_ctime[1] = in->win_ctime[1];
3738                 oh->win_mtime[1] = in->win_mtime[1];
3739 #else
3740                 oh->yst_uid = in->yst_uid;
3741                 oh->yst_gid = in->yst_gid;
3742                 oh->yst_atime = in->yst_atime;
3743                 oh->yst_mtime = in->yst_mtime;
3744                 oh->yst_ctime = in->yst_ctime;
3745                 oh->yst_rdev = in->yst_rdev;
3746 #endif
3747                 if (in->parent)
3748                         oh->parentObjectId = in->parent->objectId;
3749                 else
3750                         oh->parentObjectId = 0;
3751
3752                 if (name && *name) {
3753                         memset(oh->name, 0, sizeof(oh->name));
3754                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3755                 } else if (prevChunkId > 0)
3756                         memcpy(oh->name, oldName, sizeof(oh->name));
3757                 else
3758                         memset(oh->name, 0, sizeof(oh->name));
3759
3760                 oh->isShrink = isShrink;
3761
3762                 switch (in->variantType) {
3763                 case YAFFS_OBJECT_TYPE_UNKNOWN:
3764                         /* Should not happen */
3765                         break;
3766                 case YAFFS_OBJECT_TYPE_FILE:
3767                         oh->fileSize =
3768                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3769                              || oh->parentObjectId ==
3770                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3771                             fileVariant.fileSize;
3772                         break;
3773                 case YAFFS_OBJECT_TYPE_HARDLINK:
3774                         oh->equivalentObjectId =
3775                             in->variant.hardLinkVariant.equivalentObjectId;
3776                         break;
3777                 case YAFFS_OBJECT_TYPE_SPECIAL:
3778                         /* Do nothing */
3779                         break;
3780                 case YAFFS_OBJECT_TYPE_DIRECTORY:
3781                         /* Do nothing */
3782                         break;
3783                 case YAFFS_OBJECT_TYPE_SYMLINK:
3784                         yaffs_strncpy(oh->alias,
3785                                       in->variant.symLinkVariant.alias,
3786                                       YAFFS_MAX_ALIAS_LENGTH);
3787                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3788                         break;
3789                 }
3790
3791                 /* Tags */
3792                 yaffs_InitialiseTags(&newTags);
3793                 in->serial++;
3794                 newTags.chunkId = 0;
3795                 newTags.objectId = in->objectId;
3796                 newTags.serialNumber = in->serial;
3797
3798                 /* Add extra info for file header */
3799
3800                 newTags.extraHeaderInfoAvailable = 1;
3801                 newTags.extraParentObjectId = oh->parentObjectId;
3802                 newTags.extraFileLength = oh->fileSize;
3803                 newTags.extraIsShrinkHeader = oh->isShrink;
3804                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3805                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3806                 newTags.extraObjectType = in->variantType;
3807
3808                 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3809
3810                 /* Create new chunk in NAND */
3811                 newChunkId =
3812                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3813                                                       (prevChunkId > 0) ? 1 : 0);
3814
3815                 if (newChunkId >= 0) {
3816
3817                         in->hdrChunk = newChunkId;
3818
3819                         if (prevChunkId > 0) {
3820                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
3821                                                   __LINE__);
3822                         }
3823
3824                         if (!yaffs_ObjectHasCachedWriteData(in))
3825                                 in->dirty = 0;
3826
3827                         /* If this was a shrink, then mark the block that the chunk lives on */
3828                         if (isShrink) {
3829                                 bi = yaffs_GetBlockInfo(in->myDev,
3830                                         newChunkId / in->myDev->nChunksPerBlock);
3831                                 bi->hasShrinkHeader = 1;
3832                         }
3833
3834                 }
3835
3836                 retVal = newChunkId;
3837
3838         }
3839
3840         if (buffer)
3841                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3842
3843         return retVal;
3844 }
3845
3846 /*------------------------ Short Operations Cache ----------------------------------------
3847  *   In many situations where there is no high level buffering (eg WinCE) a lot of
3848  *   reads might be short sequential reads, and a lot of writes may be short
3849  *   sequential writes. eg. scanning/writing a jpeg file.
3850  *   In these cases, a short read/write cache can provide a huge perfomance benefit
3851  *   with dumb-as-a-rock code.
3852  *   In Linux, the page cache provides read buffering aand the short op cache provides write
3853  *   buffering.
3854  *
3855  *   There are a limited number (~10) of cache chunks per device so that we don't
3856  *   need a very intelligent search.
3857  */
3858
3859 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3860 {
3861         yaffs_Device *dev = obj->myDev;
3862         int i;
3863         yaffs_ChunkCache *cache;
3864         int nCaches = obj->myDev->nShortOpCaches;
3865
3866         for (i = 0; i < nCaches; i++) {
3867                 cache = &dev->srCache[i];
3868                 if (cache->object == obj &&
3869                     cache->dirty)
3870                         return 1;
3871         }
3872
3873         return 0;
3874 }
3875
3876
3877 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3878 {
3879         yaffs_Device *dev = obj->myDev;
3880         int lowest = -99;       /* Stop compiler whining. */
3881         int i;
3882         yaffs_ChunkCache *cache;
3883         int chunkWritten = 0;
3884         int nCaches = obj->myDev->nShortOpCaches;
3885
3886         if (nCaches > 0) {
3887                 do {
3888                         cache = NULL;
3889
3890                         /* Find the dirty cache for this object with the lowest chunk id. */
3891                         for (i = 0; i < nCaches; i++) {
3892                                 if (dev->srCache[i].object == obj &&
3893                                     dev->srCache[i].dirty) {
3894                                         if (!cache
3895                                             || dev->srCache[i].chunkId <
3896                                             lowest) {
3897                                                 cache = &dev->srCache[i];
3898                                                 lowest = cache->chunkId;
3899                                         }
3900                                 }
3901                         }
3902
3903                         if (cache && !cache->locked) {
3904                                 /* Write it out and free it up */
3905
3906                                 chunkWritten =
3907                                     yaffs_WriteChunkDataToObject(cache->object,
3908                                                                  cache->chunkId,
3909                                                                  cache->data,
3910                                                                  cache->nBytes,
3911                                                                  1);
3912                                 cache->dirty = 0;
3913                                 cache->object = NULL;
3914                         }
3915
3916                 } while (cache && chunkWritten > 0);
3917
3918                 if (cache) {
3919                         /* Hoosterman, disk full while writing cache out. */
3920                         T(YAFFS_TRACE_ERROR,
3921                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3922
3923                 }
3924         }
3925
3926 }
3927
3928 /*yaffs_FlushEntireDeviceCache(dev)
3929  *
3930  *
3931  */
3932
3933 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3934 {
3935         yaffs_Object *obj;
3936         int nCaches = dev->nShortOpCaches;
3937         int i;
3938
3939         /* Find a dirty object in the cache and flush it...
3940          * until there are no further dirty objects.
3941          */
3942         do {
3943                 obj = NULL;
3944                 for (i = 0; i < nCaches && !obj; i++) {
3945                         if (dev->srCache[i].object &&
3946                             dev->srCache[i].dirty)
3947                                 obj = dev->srCache[i].object;
3948
3949                 }
3950                 if (obj)
3951                         yaffs_FlushFilesChunkCache(obj);
3952
3953         } while (obj);
3954
3955 }
3956
3957
3958 /* Grab us a cache chunk for use.
3959  * First look for an empty one.
3960  * Then look for the least recently used non-dirty one.
3961  * Then look for the least recently used dirty one...., flush and look again.
3962  */
3963 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3964 {
3965         int i;
3966
3967         if (dev->nShortOpCaches > 0) {
3968                 for (i = 0; i < dev->nShortOpCaches; i++) {
3969                         if (!dev->srCache[i].object)
3970                                 return &dev->srCache[i];
3971                 }
3972         }
3973
3974         return NULL;
3975 }
3976
3977 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3978 {
3979         yaffs_ChunkCache *cache;
3980         yaffs_Object *theObj;
3981         int usage;
3982         int i;
3983         int pushout;
3984
3985         if (dev->nShortOpCaches > 0) {
3986                 /* Try find a non-dirty one... */
3987
3988                 cache = yaffs_GrabChunkCacheWorker(dev);
3989
3990                 if (!cache) {
3991                         /* They were all dirty, find the last recently used object and flush
3992                          * its cache, then  find again.
3993                          * NB what's here is not very accurate, we actually flush the object
3994                          * the last recently used page.
3995                          */
3996
3997                         /* With locking we can't assume we can use entry zero */
3998
3999                         theObj = NULL;
4000                         usage = -1;
4001                         cache = NULL;
4002                         pushout = -1;
4003
4004                         for (i = 0; i < dev->nShortOpCaches; i++) {
4005                                 if (dev->srCache[i].object &&
4006                                     !dev->srCache[i].locked &&
4007                                     (dev->srCache[i].lastUse < usage || !cache)) {
4008                                         usage = dev->srCache[i].lastUse;
4009                                         theObj = dev->srCache[i].object;
4010                                         cache = &dev->srCache[i];
4011                                         pushout = i;
4012                                 }
4013                         }
4014
4015                         if (!cache || cache->dirty) {
4016                                 /* Flush and try again */
4017                                 yaffs_FlushFilesChunkCache(theObj);
4018                                 cache = yaffs_GrabChunkCacheWorker(dev);
4019                         }
4020
4021                 }
4022                 return cache;
4023         } else
4024                 return NULL;
4025
4026 }
4027
4028 /* Find a cached chunk */
4029 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4030                                               int chunkId)
4031 {
4032         yaffs_Device *dev = obj->myDev;
4033         int i;
4034         if (dev->nShortOpCaches > 0) {
4035                 for (i = 0; i < dev->nShortOpCaches; i++) {
4036                         if (dev->srCache[i].object == obj &&
4037                             dev->srCache[i].chunkId == chunkId) {
4038                                 dev->cacheHits++;
4039
4040                                 return &dev->srCache[i];
4041                         }
4042                 }
4043         }
4044         return NULL;
4045 }
4046
4047 /* Mark the chunk for the least recently used algorithym */
4048 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4049                                 int isAWrite)
4050 {
4051
4052         if (dev->nShortOpCaches > 0) {
4053                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4054                         /* Reset the cache usages */
4055                         int i;
4056                         for (i = 1; i < dev->nShortOpCaches; i++)
4057                                 dev->srCache[i].lastUse = 0;
4058
4059                         dev->srLastUse = 0;
4060                 }
4061
4062                 dev->srLastUse++;
4063
4064                 cache->lastUse = dev->srLastUse;
4065
4066                 if (isAWrite)
4067                         cache->dirty = 1;
4068         }
4069 }
4070
4071 /* Invalidate a single cache page.
4072  * Do this when a whole page gets written,
4073  * ie the short cache for this page is no longer valid.
4074  */
4075 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4076 {
4077         if (object->myDev->nShortOpCaches > 0) {
4078                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4079
4080                 if (cache)
4081                         cache->object = NULL;
4082         }
4083 }
4084
4085 /* Invalidate all the cache pages associated with this object
4086  * Do this whenever ther file is deleted or resized.
4087  */
4088 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4089 {
4090         int i;
4091         yaffs_Device *dev = in->myDev;
4092
4093         if (dev->nShortOpCaches > 0) {
4094                 /* Invalidate it. */
4095                 for (i = 0; i < dev->nShortOpCaches; i++) {
4096                         if (dev->srCache[i].object == in)
4097                                 dev->srCache[i].object = NULL;
4098                 }
4099         }
4100 }
4101
4102 /*--------------------- Checkpointing --------------------*/
4103
4104
4105 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4106 {
4107         yaffs_CheckpointValidity cp;
4108
4109         memset(&cp, 0, sizeof(cp));
4110
4111         cp.structType = sizeof(cp);
4112         cp.magic = YAFFS_MAGIC;
4113         cp.version = YAFFS_CHECKPOINT_VERSION;
4114         cp.head = (head) ? 1 : 0;
4115
4116         return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4117                 1 : 0;
4118 }
4119
4120 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4121 {
4122         yaffs_CheckpointValidity cp;
4123         int ok;
4124
4125         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4126
4127         if (ok)
4128                 ok = (cp.structType == sizeof(cp)) &&
4129                      (cp.magic == YAFFS_MAGIC) &&
4130                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4131                      (cp.head == ((head) ? 1 : 0));
4132         return ok ? 1 : 0;
4133 }
4134
4135 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4136                                            yaffs_Device *dev)
4137 {
4138         cp->nErasedBlocks = dev->nErasedBlocks;
4139         cp->allocationBlock = dev->allocationBlock;
4140         cp->allocationPage = dev->allocationPage;
4141         cp->nFreeChunks = dev->nFreeChunks;
4142
4143         cp->nDeletedFiles = dev->nDeletedFiles;
4144         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4145         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4146         cp->sequenceNumber = dev->sequenceNumber;
4147         cp->oldestDirtySequence = dev->oldestDirtySequence;
4148
4149 }
4150
4151 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4152                                            yaffs_CheckpointDevice *cp)
4153 {
4154         dev->nErasedBlocks = cp->nErasedBlocks;
4155         dev->allocationBlock = cp->allocationBlock;
4156         dev->allocationPage = cp->allocationPage;
4157         dev->nFreeChunks = cp->nFreeChunks;
4158
4159         dev->nDeletedFiles = cp->nDeletedFiles;
4160         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4161         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4162         dev->sequenceNumber = cp->sequenceNumber;
4163         dev->oldestDirtySequence = cp->oldestDirtySequence;
4164 }
4165
4166
4167 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4168 {
4169         yaffs_CheckpointDevice cp;
4170         __u32 nBytes;
4171         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4172
4173         int ok;
4174
4175         /* Write device runtime values*/
4176         yaffs_DeviceToCheckpointDevice(&cp, dev);
4177         cp.structType = sizeof(cp);
4178
4179         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4180
4181         /* Write block info */
4182         if (ok) {
4183                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4184                 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4185         }
4186
4187         /* Write chunk bits */
4188         if (ok) {
4189                 nBytes = nBlocks * dev->chunkBitmapStride;
4190                 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4191         }
4192         return   ok ? 1 : 0;
4193
4194 }
4195
4196 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4197 {
4198         yaffs_CheckpointDevice cp;
4199         __u32 nBytes;
4200         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4201
4202         int ok;
4203
4204         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4205         if (!ok)
4206                 return 0;
4207
4208         if (cp.structType != sizeof(cp))
4209                 return 0;
4210
4211
4212         yaffs_CheckpointDeviceToDevice(dev, &cp);
4213
4214         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4215
4216         ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4217
4218         if (!ok)
4219                 return 0;
4220         nBytes = nBlocks * dev->chunkBitmapStride;
4221
4222         ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4223
4224         return ok ? 1 : 0;
4225 }
4226
4227 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4228                                            yaffs_Object *obj)
4229 {
4230
4231         cp->objectId = obj->objectId;
4232         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4233         cp->hdrChunk = obj->hdrChunk;
4234         cp->variantType = obj->variantType;
4235         cp->deleted = obj->deleted;
4236         cp->softDeleted = obj->softDeleted;
4237         cp->unlinked = obj->unlinked;
4238         cp->fake = obj->fake;
4239         cp->renameAllowed = obj->renameAllowed;
4240         cp->unlinkAllowed = obj->unlinkAllowed;
4241         cp->serial = obj->serial;
4242         cp->nDataChunks = obj->nDataChunks;
4243
4244         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4245                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4246         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4247                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4248 }
4249
4250 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4251 {
4252
4253         yaffs_Object *parent;
4254
4255         if (obj->variantType != cp->variantType) {
4256                 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4257                         TCONT("chunk %d does not match existing object type %d")
4258                         TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4259                         obj->variantType));
4260                 return 0;
4261         }
4262
4263         obj->objectId = cp->objectId;
4264
4265         if (cp->parentId)
4266                 parent = yaffs_FindOrCreateObjectByNumber(
4267                                         obj->myDev,
4268                                         cp->parentId,
4269                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4270         else
4271                 parent = NULL;
4272
4273         if (parent) {
4274                 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4275                         T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4276                                 TCONT(" chunk %d Parent type, %d, not directory")
4277                                 TENDSTR),
4278                                 cp->objectId, cp->parentId, cp->variantType,
4279                                 cp->hdrChunk, parent->variantType));
4280                         return 0;
4281                 }
4282                 yaffs_AddObjectToDirectory(parent, obj);
4283         }
4284
4285         obj->hdrChunk = cp->hdrChunk;
4286         obj->variantType = cp->variantType;
4287         obj->deleted = cp->deleted;
4288         obj->softDeleted = cp->softDeleted;
4289         obj->unlinked = cp->unlinked;
4290         obj->fake = cp->fake;
4291         obj->renameAllowed = cp->renameAllowed;
4292         obj->unlinkAllowed = cp->unlinkAllowed;
4293         obj->serial = cp->serial;
4294         obj->nDataChunks = cp->nDataChunks;
4295
4296         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4297                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4298         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4299                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4300
4301         if (obj->hdrChunk > 0)
4302                 obj->lazyLoaded = 1;
4303         return 1;
4304 }
4305
4306
4307
4308 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4309                                         __u32 level, int chunkOffset)
4310 {
4311         int i;
4312         yaffs_Device *dev = in->myDev;
4313         int ok = 1;
4314         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4315
4316         if (tnodeSize < sizeof(yaffs_Tnode))
4317                 tnodeSize = sizeof(yaffs_Tnode);
4318
4319
4320         if (tn) {
4321                 if (level > 0) {
4322
4323                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4324                                 if (tn->internal[i]) {
4325                                         ok = yaffs_CheckpointTnodeWorker(in,
4326                                                         tn->internal[i],
4327                                                         level - 1,
4328                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4329                                 }
4330                         }
4331                 } else if (level == 0) {
4332                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4333                         ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4334                         if (ok)
4335                                 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4336                 }
4337         }
4338
4339         return ok;
4340
4341 }
4342
4343 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4344 {
4345         __u32 endMarker = ~0;
4346         int ok = 1;
4347
4348         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4349                 ok = yaffs_CheckpointTnodeWorker(obj,
4350                                             obj->variant.fileVariant.top,
4351                                             obj->variant.fileVariant.topLevel,
4352                                             0);
4353                 if (ok)
4354                         ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4355                                 sizeof(endMarker));
4356         }
4357
4358         return ok ? 1 : 0;
4359 }
4360
4361 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4362 {
4363         __u32 baseChunk;
4364         int ok = 1;
4365         yaffs_Device *dev = obj->myDev;
4366         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4367         yaffs_Tnode *tn;
4368         int nread = 0;
4369         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4370
4371         if (tnodeSize < sizeof(yaffs_Tnode))
4372                 tnodeSize = sizeof(yaffs_Tnode);
4373
4374         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4375
4376         while (ok && (~baseChunk)) {
4377                 nread++;
4378                 /* Read level 0 tnode */
4379
4380
4381                 tn = yaffs_GetTnodeRaw(dev);
4382                 if (tn)
4383                         ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4384                 else
4385                         ok = 0;
4386
4387                 if (tn && ok)
4388                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4389                                                         fileStructPtr,
4390                                                         baseChunk,
4391                                                         tn) ? 1 : 0;
4392
4393                 if (ok)
4394                         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4395
4396         }
4397
4398         T(YAFFS_TRACE_CHECKPOINT, (
4399                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4400                 nread, baseChunk, ok));
4401
4402         return ok ? 1 : 0;
4403 }
4404
4405
4406 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4407 {
4408         yaffs_Object *obj;
4409         yaffs_CheckpointObject cp;
4410         int i;
4411         int ok = 1;
4412         struct ylist_head *lh;
4413
4414
4415         /* Iterate through the objects in each hash entry,
4416          * dumping them to the checkpointing stream.
4417          */
4418
4419         for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
4420                 ylist_for_each(lh, &dev->objectBucket[i].list) {
4421                         if (lh) {
4422                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
4423                                 if (!obj->deferedFree) {
4424                                         yaffs_ObjectToCheckpointObject(&cp, obj);
4425                                         cp.structType = sizeof(cp);
4426
4427                                         T(YAFFS_TRACE_CHECKPOINT, (
4428                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4429                                                 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, (unsigned) obj));
4430
4431                                         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4432
4433                                         if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4434                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4435                                 }
4436                         }
4437                 }
4438         }
4439
4440         /* Dump end of list */
4441         memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4442         cp.structType = sizeof(cp);
4443
4444         if (ok)
4445                 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4446
4447         return ok ? 1 : 0;
4448 }
4449
4450 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4451 {
4452         yaffs_Object *obj;
4453         yaffs_CheckpointObject cp;
4454         int ok = 1;
4455         int done = 0;
4456         yaffs_Object *hardList = NULL;
4457
4458         while (ok && !done) {
4459                 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4460                 if (cp.structType != sizeof(cp)) {
4461                         T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4462                                 cp.structType, sizeof(cp), ok));
4463                         ok = 0;
4464                 }
4465
4466                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4467                         cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4468
4469                 if (ok && cp.objectId == ~0)
4470                         done = 1;
4471                 else if (ok) {
4472                         obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4473                         if (obj) {
4474                                 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4475                                 if (!ok)
4476                                         break;
4477                                 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4478                                         ok = yaffs_ReadCheckpointTnodes(obj);
4479                                 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4480                                         obj->hardLinks.next =
4481                                                 (struct ylist_head *) hardList;
4482                                         hardList = obj;
4483                                 }
4484                         } else
4485                                 ok = 0;
4486                 }
4487         }
4488
4489         if (ok)
4490                 yaffs_HardlinkFixup(dev, hardList);
4491
4492         return ok ? 1 : 0;
4493 }
4494
4495 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4496 {
4497         __u32 checkpointSum;
4498         int ok;
4499
4500         yaffs_GetCheckpointSum(dev, &checkpointSum);
4501
4502         ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4503
4504         if (!ok)
4505                 return 0;
4506
4507         return 1;
4508 }
4509
4510 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4511 {
4512         __u32 checkpointSum0;
4513         __u32 checkpointSum1;
4514         int ok;
4515
4516         yaffs_GetCheckpointSum(dev, &checkpointSum0);
4517
4518         ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4519
4520         if (!ok)
4521                 return 0;
4522
4523         if (checkpointSum0 != checkpointSum1)
4524                 return 0;
4525
4526         return 1;
4527 }
4528
4529
4530 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4531 {
4532         int ok = 1;
4533
4534         if (dev->skipCheckpointWrite || !dev->isYaffs2) {
4535                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4536                 ok = 0;
4537         }
4538
4539         if (ok)
4540                 ok = yaffs_CheckpointOpen(dev, 1);
4541
4542         if (ok) {
4543                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4544                 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4545         }
4546         if (ok) {
4547                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4548                 ok = yaffs_WriteCheckpointDevice(dev);
4549         }
4550         if (ok) {
4551                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4552                 ok = yaffs_WriteCheckpointObjects(dev);
4553         }
4554         if (ok) {
4555                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4556                 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4557         }
4558
4559         if (ok)
4560                 ok = yaffs_WriteCheckpointSum(dev);
4561
4562         if (!yaffs_CheckpointClose(dev))
4563                 ok = 0;
4564
4565         if (ok)
4566                 dev->isCheckpointed = 1;
4567         else
4568                 dev->isCheckpointed = 0;
4569
4570         return dev->isCheckpointed;
4571 }
4572
4573 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4574 {
4575         int ok = 1;
4576
4577         if (dev->skipCheckpointRead || !dev->isYaffs2) {
4578                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4579                 ok = 0;
4580         }
4581
4582         if (ok)
4583                 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4584
4585         if (ok) {
4586                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4587                 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4588         }
4589         if (ok) {
4590                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4591                 ok = yaffs_ReadCheckpointDevice(dev);
4592         }
4593         if (ok) {
4594                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4595                 ok = yaffs_ReadCheckpointObjects(dev);
4596         }
4597         if (ok) {
4598                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4599                 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4600         }
4601
4602         if (ok) {
4603                 ok = yaffs_ReadCheckpointSum(dev);
4604                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4605         }
4606
4607         if (!yaffs_CheckpointClose(dev))
4608                 ok = 0;
4609
4610         if (ok)
4611                 dev->isCheckpointed = 1;
4612         else
4613                 dev->isCheckpointed = 0;
4614
4615         return ok ? 1 : 0;
4616
4617 }
4618
4619 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4620 {
4621         if (dev->isCheckpointed ||
4622                         dev->blocksInCheckpoint > 0) {
4623                 dev->isCheckpointed = 0;
4624                 yaffs_CheckpointInvalidateStream(dev);
4625                 if (dev->superBlock && dev->markSuperBlockDirty)
4626                         dev->markSuperBlockDirty(dev->superBlock);
4627         }
4628 }
4629
4630
4631 int yaffs_CheckpointSave(yaffs_Device *dev)
4632 {
4633
4634         T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4635
4636         yaffs_VerifyObjects(dev);
4637         yaffs_VerifyBlocks(dev);
4638         yaffs_VerifyFreeChunks(dev);
4639
4640         if (!dev->isCheckpointed) {
4641                 yaffs_InvalidateCheckpoint(dev);
4642                 yaffs_WriteCheckpointData(dev);
4643         }
4644
4645         T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4646
4647         return dev->isCheckpointed;
4648 }
4649
4650 int yaffs_CheckpointRestore(yaffs_Device *dev)
4651 {
4652         int retval;
4653         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4654
4655         retval = yaffs_ReadCheckpointData(dev);
4656
4657         if (dev->isCheckpointed) {
4658                 yaffs_VerifyObjects(dev);
4659                 yaffs_VerifyBlocks(dev);
4660                 yaffs_VerifyFreeChunks(dev);
4661         }
4662
4663         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4664
4665         return retval;
4666 }
4667
4668 /*--------------------- File read/write ------------------------
4669  * Read and write have very similar structures.
4670  * In general the read/write has three parts to it
4671  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4672  * Some complete chunks
4673  * An incomplete chunk to end off with
4674  *
4675  * Curve-balls: the first chunk might also be the last chunk.
4676  */
4677
4678 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4679                         int nBytes)
4680 {
4681
4682         int chunk;
4683         __u32 start;
4684         int nToCopy;
4685         int n = nBytes;
4686         int nDone = 0;
4687         yaffs_ChunkCache *cache;
4688
4689         yaffs_Device *dev;
4690
4691         dev = in->myDev;
4692
4693         while (n > 0) {
4694                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4695                 /* start = offset % dev->nDataBytesPerChunk; */
4696                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4697                 chunk++;
4698
4699                 /* OK now check for the curveball where the start and end are in
4700                  * the same chunk.
4701                  */
4702                 if ((start + n) < dev->nDataBytesPerChunk)
4703                         nToCopy = n;
4704                 else
4705                         nToCopy = dev->nDataBytesPerChunk - start;
4706
4707                 cache = yaffs_FindChunkCache(in, chunk);
4708
4709                 /* If the chunk is already in the cache or it is less than a whole chunk
4710                  * or we're using inband tags then use the cache (if there is caching)
4711                  * else bypass the cache.
4712                  */
4713                 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4714                         if (dev->nShortOpCaches > 0) {
4715
4716                                 /* If we can't find the data in the cache, then load it up. */
4717
4718                                 if (!cache) {
4719                                         cache = yaffs_GrabChunkCache(in->myDev);
4720                                         cache->object = in;
4721                                         cache->chunkId = chunk;
4722                                         cache->dirty = 0;
4723                                         cache->locked = 0;
4724                                         yaffs_ReadChunkDataFromObject(in, chunk,
4725                                                                       cache->
4726                                                                       data);
4727                                         cache->nBytes = 0;
4728                                 }
4729
4730                                 yaffs_UseChunkCache(dev, cache, 0);
4731
4732                                 cache->locked = 1;
4733
4734
4735                                 memcpy(buffer, &cache->data[start], nToCopy);
4736
4737                                 cache->locked = 0;
4738                         } else {
4739                                 /* Read into the local buffer then copy..*/
4740
4741                                 __u8 *localBuffer =
4742                                     yaffs_GetTempBuffer(dev, __LINE__);
4743                                 yaffs_ReadChunkDataFromObject(in, chunk,
4744                                                               localBuffer);
4745
4746                                 memcpy(buffer, &localBuffer[start], nToCopy);
4747
4748
4749                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4750                                                         __LINE__);
4751                         }
4752
4753                 } else {
4754
4755                         /* A full chunk. Read directly into the supplied buffer. */
4756                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4757
4758                 }
4759
4760                 n -= nToCopy;
4761                 offset += nToCopy;
4762                 buffer += nToCopy;
4763                 nDone += nToCopy;
4764
4765         }
4766
4767         return nDone;
4768 }
4769
4770 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4771                         int nBytes, int writeThrough)
4772 {
4773
4774         int chunk;
4775         __u32 start;
4776         int nToCopy;
4777         int n = nBytes;
4778         int nDone = 0;
4779         int nToWriteBack;
4780         int startOfWrite = offset;
4781         int chunkWritten = 0;
4782         __u32 nBytesRead;
4783         __u32 chunkStart;
4784
4785         yaffs_Device *dev;
4786
4787         dev = in->myDev;
4788
4789         while (n > 0 && chunkWritten >= 0) {
4790                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4791                 /* start = offset % dev->nDataBytesPerChunk; */
4792                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4793
4794                 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4795                                 start >= dev->nDataBytesPerChunk) {
4796                         T(YAFFS_TRACE_ERROR, (
4797                            TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4798                            TENDSTR),
4799                            (int)offset, chunk, start));
4800                 }
4801                 chunk++;
4802
4803                 /* OK now check for the curveball where the start and end are in
4804                  * the same chunk.
4805                  */
4806
4807                 if ((start + n) < dev->nDataBytesPerChunk) {
4808                         nToCopy = n;
4809
4810                         /* Now folks, to calculate how many bytes to write back....
4811                          * If we're overwriting and not writing to then end of file then
4812                          * we need to write back as much as was there before.
4813                          */
4814
4815                         chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
4816
4817                         if (chunkStart > in->variant.fileVariant.fileSize)
4818                                 nBytesRead = 0; /* Past end of file */
4819                         else
4820                                 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
4821
4822                         if (nBytesRead > dev->nDataBytesPerChunk)
4823                                 nBytesRead = dev->nDataBytesPerChunk;
4824
4825                         nToWriteBack =
4826                             (nBytesRead >
4827                              (start + n)) ? nBytesRead : (start + n);
4828
4829                         if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
4830                                 YBUG();
4831
4832                 } else {
4833                         nToCopy = dev->nDataBytesPerChunk - start;
4834                         nToWriteBack = dev->nDataBytesPerChunk;
4835                 }
4836
4837                 if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4838                         /* An incomplete start or end chunk (or maybe both start and end chunk),
4839                          * or we're using inband tags, so we want to use the cache buffers.
4840                          */
4841                         if (dev->nShortOpCaches > 0) {
4842                                 yaffs_ChunkCache *cache;
4843                                 /* If we can't find the data in the cache, then load the cache */
4844                                 cache = yaffs_FindChunkCache(in, chunk);
4845
4846                                 if (!cache
4847                                     && yaffs_CheckSpaceForAllocation(in->
4848                                                                      myDev)) {
4849                                         cache = yaffs_GrabChunkCache(in->myDev);
4850                                         cache->object = in;
4851                                         cache->chunkId = chunk;
4852                                         cache->dirty = 0;
4853                                         cache->locked = 0;
4854                                         yaffs_ReadChunkDataFromObject(in, chunk,
4855                                                                       cache->
4856                                                                       data);
4857                                 } else if (cache &&
4858                                         !cache->dirty &&
4859                                         !yaffs_CheckSpaceForAllocation(in->myDev)) {
4860                                         /* Drop the cache if it was a read cache item and
4861                                          * no space check has been made for it.
4862                                          */
4863                                          cache = NULL;
4864                                 }
4865
4866                                 if (cache) {
4867                                         yaffs_UseChunkCache(dev, cache, 1);
4868                                         cache->locked = 1;
4869
4870
4871                                         memcpy(&cache->data[start], buffer,
4872                                                nToCopy);
4873
4874
4875                                         cache->locked = 0;
4876                                         cache->nBytes = nToWriteBack;
4877
4878                                         if (writeThrough) {
4879                                                 chunkWritten =
4880                                                     yaffs_WriteChunkDataToObject
4881                                                     (cache->object,
4882                                                      cache->chunkId,
4883                                                      cache->data, cache->nBytes,
4884                                                      1);
4885                                                 cache->dirty = 0;
4886                                         }
4887
4888                                 } else {
4889                                         chunkWritten = -1;      /* fail the write */
4890                                 }
4891                         } else {
4892                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
4893                                  * Read into the local buffer then copy, then copy over and write back.
4894                                  */
4895
4896                                 __u8 *localBuffer =
4897                                     yaffs_GetTempBuffer(dev, __LINE__);
4898
4899                                 yaffs_ReadChunkDataFromObject(in, chunk,
4900                                                               localBuffer);
4901
4902
4903
4904                                 memcpy(&localBuffer[start], buffer, nToCopy);
4905
4906                                 chunkWritten =
4907                                     yaffs_WriteChunkDataToObject(in, chunk,
4908                                                                  localBuffer,
4909                                                                  nToWriteBack,
4910                                                                  0);
4911
4912                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4913                                                         __LINE__);
4914
4915                         }
4916
4917                 } else {
4918                         /* A full chunk. Write directly from the supplied buffer. */
4919
4920
4921
4922                         chunkWritten =
4923                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
4924                                                          dev->nDataBytesPerChunk,
4925                                                          0);
4926
4927                         /* Since we've overwritten the cached data, we better invalidate it. */
4928                         yaffs_InvalidateChunkCache(in, chunk);
4929                 }
4930
4931                 if (chunkWritten >= 0) {
4932                         n -= nToCopy;
4933                         offset += nToCopy;
4934                         buffer += nToCopy;
4935                         nDone += nToCopy;
4936                 }
4937
4938         }
4939
4940         /* Update file object */
4941
4942         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
4943                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4944
4945         in->dirty = 1;
4946
4947         return nDone;
4948 }
4949
4950
4951 /* ---------------------- File resizing stuff ------------------ */
4952
4953 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
4954 {
4955
4956         yaffs_Device *dev = in->myDev;
4957         int oldFileSize = in->variant.fileVariant.fileSize;
4958
4959         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4960
4961         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4962             dev->nDataBytesPerChunk;
4963         int i;
4964         int chunkId;
4965
4966         /* Delete backwards so that we don't end up with holes if
4967          * power is lost part-way through the operation.
4968          */
4969         for (i = lastDel; i >= startDel; i--) {
4970                 /* NB this could be optimised somewhat,
4971                  * eg. could retrieve the tags and write them without
4972                  * using yaffs_DeleteChunk
4973                  */
4974
4975                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4976                 if (chunkId > 0) {
4977                         if (chunkId <
4978                             (dev->internalStartBlock * dev->nChunksPerBlock)
4979                             || chunkId >=
4980                             ((dev->internalEndBlock +
4981                               1) * dev->nChunksPerBlock)) {
4982                                 T(YAFFS_TRACE_ALWAYS,
4983                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
4984                                    chunkId, i));
4985                         } else {
4986                                 in->nDataChunks--;
4987                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4988                         }
4989                 }
4990         }
4991
4992 }
4993
4994 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
4995 {
4996
4997         int oldFileSize = in->variant.fileVariant.fileSize;
4998         __u32 newSizeOfPartialChunk;
4999         int newFullChunks;
5000
5001         yaffs_Device *dev = in->myDev;
5002
5003         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5004
5005         yaffs_FlushFilesChunkCache(in);
5006         yaffs_InvalidateWholeChunkCache(in);
5007
5008         yaffs_CheckGarbageCollection(dev);
5009
5010         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5011                 return YAFFS_FAIL;
5012
5013         if (newSize == oldFileSize)
5014                 return YAFFS_OK;
5015
5016         if (newSize < oldFileSize) {
5017
5018                 yaffs_PruneResizedChunks(in, newSize);
5019
5020                 if (newSizeOfPartialChunk != 0) {
5021                         int lastChunk = 1 + newFullChunks;
5022
5023                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5024
5025                         /* Got to read and rewrite the last chunk with its new size and zero pad */
5026                         yaffs_ReadChunkDataFromObject(in, lastChunk,
5027                                                       localBuffer);
5028
5029                         memset(localBuffer + newSizeOfPartialChunk, 0,
5030                                dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5031
5032                         yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5033                                                      newSizeOfPartialChunk, 1);
5034
5035                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5036                 }
5037
5038                 in->variant.fileVariant.fileSize = newSize;
5039
5040                 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5041         } else {
5042                 /* newsSize > oldFileSize */
5043                 in->variant.fileVariant.fileSize = newSize;
5044         }
5045
5046
5047         /* Write a new object header to reflect the resize.
5048          * show we've shrunk the file, if need be
5049          * Do this only if the file is not in the deleted directories
5050          * and is not shadowed.
5051          */
5052         if (in->parent &&
5053             !in->isShadowed &&
5054             in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5055             in->parent->objectId != YAFFS_OBJECTID_DELETED)
5056                 yaffs_UpdateObjectHeader(in, NULL, 0,
5057                                          (newSize < oldFileSize) ? 1 : 0, 0);
5058
5059         return YAFFS_OK;
5060 }
5061
5062 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5063 {
5064         obj = yaffs_GetEquivalentObject(obj);
5065
5066         switch (obj->variantType) {
5067         case YAFFS_OBJECT_TYPE_FILE:
5068                 return obj->variant.fileVariant.fileSize;
5069         case YAFFS_OBJECT_TYPE_SYMLINK:
5070                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5071         default:
5072                 return 0;
5073         }
5074 }
5075
5076
5077
5078 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5079 {
5080         int retVal;
5081         if (in->dirty) {
5082                 yaffs_FlushFilesChunkCache(in);
5083                 if(dataSync) /* Only sync data */
5084                         retVal=YAFFS_OK;
5085                 else {
5086                         if (updateTime) {
5087 #ifdef CONFIG_YAFFS_WINCE
5088                                 yfsd_WinFileTimeNow(in->win_mtime);
5089 #else
5090
5091                                 in->yst_mtime = Y_CURRENT_TIME;
5092
5093 #endif
5094                         }
5095
5096                         retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5097                                 0) ? YAFFS_OK : YAFFS_FAIL;
5098                 }
5099         } else {
5100                 retVal = YAFFS_OK;
5101         }
5102
5103         return retVal;
5104
5105 }
5106
5107 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5108 {
5109
5110         /* First off, invalidate the file's data in the cache, without flushing. */
5111         yaffs_InvalidateWholeChunkCache(in);
5112
5113         if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5114                 /* Move to the unlinked directory so we have a record that it was deleted. */
5115                 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5116
5117         }
5118
5119         yaffs_RemoveObjectFromDirectory(in);
5120         yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5121         in->hdrChunk = 0;
5122
5123         yaffs_FreeObject(in);
5124         return YAFFS_OK;
5125
5126 }
5127
5128 /* yaffs_DeleteFile deletes the whole file data
5129  * and the inode associated with the file.
5130  * It does not delete the links associated with the file.
5131  */
5132 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5133 {
5134
5135         int retVal;
5136         int immediateDeletion = 0;
5137
5138 #ifdef __KERNEL__
5139         if (!in->myInode)
5140                 immediateDeletion = 1;
5141 #else
5142         if (in->inUse <= 0)
5143                 immediateDeletion = 1;
5144 #endif
5145
5146         if (immediateDeletion) {
5147                 retVal =
5148                     yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5149                                            _Y("deleted"), 0, 0);
5150                 T(YAFFS_TRACE_TRACING,
5151                   (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5152                    in->objectId));
5153                 in->deleted = 1;
5154                 in->myDev->nDeletedFiles++;
5155                 if (1 || in->myDev->isYaffs2)
5156                         yaffs_ResizeFile(in, 0);
5157                 yaffs_SoftDeleteFile(in);
5158         } else {
5159                 retVal =
5160                     yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5161                                            _Y("unlinked"), 0, 0);
5162         }
5163
5164
5165         return retVal;
5166 }
5167
5168 int yaffs_DeleteFile(yaffs_Object *in)
5169 {
5170         int retVal = YAFFS_OK;
5171         int deleted = in->deleted;
5172
5173         yaffs_ResizeFile(in, 0);
5174
5175         if (in->nDataChunks > 0) {
5176                 /* Use soft deletion if there is data in the file.
5177                  * That won't be the case if it has been resized to zero.
5178                  */
5179                 if (!in->unlinked)
5180                         retVal = yaffs_UnlinkFileIfNeeded(in);
5181
5182                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5183                         in->deleted = 1;
5184                         deleted = 1;
5185                         in->myDev->nDeletedFiles++;
5186                         yaffs_SoftDeleteFile(in);
5187                 }
5188                 return deleted ? YAFFS_OK : YAFFS_FAIL;
5189         } else {
5190                 /* The file has no data chunks so we toss it immediately */
5191                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5192                 in->variant.fileVariant.top = NULL;
5193                 yaffs_DoGenericObjectDeletion(in);
5194
5195                 return YAFFS_OK;
5196         }
5197 }
5198
5199 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5200 {
5201         return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5202                 !(ylist_empty(&obj->variant.directoryVariant.children));
5203 }
5204
5205 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5206 {
5207         /* First check that the directory is empty. */
5208         if (yaffs_IsNonEmptyDirectory(obj))
5209                 return YAFFS_FAIL;
5210
5211         return yaffs_DoGenericObjectDeletion(obj);
5212 }
5213
5214 static int yaffs_DeleteSymLink(yaffs_Object *in)
5215 {
5216         YFREE(in->variant.symLinkVariant.alias);
5217
5218         return yaffs_DoGenericObjectDeletion(in);
5219 }
5220
5221 static int yaffs_DeleteHardLink(yaffs_Object *in)
5222 {
5223         /* remove this hardlink from the list assocaited with the equivalent
5224          * object
5225          */
5226         ylist_del_init(&in->hardLinks);
5227         return yaffs_DoGenericObjectDeletion(in);
5228 }
5229
5230 int yaffs_DeleteObject(yaffs_Object *obj)
5231 {
5232 int retVal = -1;
5233         switch (obj->variantType) {
5234         case YAFFS_OBJECT_TYPE_FILE:
5235                 retVal = yaffs_DeleteFile(obj);
5236                 break;
5237         case YAFFS_OBJECT_TYPE_DIRECTORY:
5238                 return yaffs_DeleteDirectory(obj);
5239                 break;
5240         case YAFFS_OBJECT_TYPE_SYMLINK:
5241                 retVal = yaffs_DeleteSymLink(obj);
5242                 break;
5243         case YAFFS_OBJECT_TYPE_HARDLINK:
5244                 retVal = yaffs_DeleteHardLink(obj);
5245                 break;
5246         case YAFFS_OBJECT_TYPE_SPECIAL:
5247                 retVal = yaffs_DoGenericObjectDeletion(obj);
5248                 break;
5249         case YAFFS_OBJECT_TYPE_UNKNOWN:
5250                 retVal = 0;
5251                 break;          /* should not happen. */
5252         }
5253
5254         return retVal;
5255 }
5256
5257 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5258 {
5259
5260         int immediateDeletion = 0;
5261
5262 #ifdef __KERNEL__
5263         if (!obj->myInode)
5264                 immediateDeletion = 1;
5265 #else
5266         if (obj->inUse <= 0)
5267                 immediateDeletion = 1;
5268 #endif
5269
5270         if(obj)
5271                 yaffs_UpdateParent(obj->parent);
5272
5273         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5274                 return yaffs_DeleteHardLink(obj);
5275         } else if (!ylist_empty(&obj->hardLinks)) {
5276                 /* Curve ball: We're unlinking an object that has a hardlink.
5277                  *
5278                  * This problem arises because we are not strictly following
5279                  * The Linux link/inode model.
5280                  *
5281                  * We can't really delete the object.
5282                  * Instead, we do the following:
5283                  * - Select a hardlink.
5284                  * - Unhook it from the hard links
5285                  * - Unhook it from its parent directory (so that the rename can work)
5286                  * - Rename the object to the hardlink's name.
5287                  * - Delete the hardlink
5288                  */
5289
5290                 yaffs_Object *hl;
5291                 int retVal;
5292                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5293
5294                 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5295
5296                 ylist_del_init(&hl->hardLinks);
5297                 ylist_del_init(&hl->siblings);
5298
5299                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5300
5301                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5302
5303                 if (retVal == YAFFS_OK)
5304                         retVal = yaffs_DoGenericObjectDeletion(hl);
5305
5306                 return retVal;
5307
5308         } else if (immediateDeletion) {
5309                 switch (obj->variantType) {
5310                 case YAFFS_OBJECT_TYPE_FILE:
5311                         return yaffs_DeleteFile(obj);
5312                         break;
5313                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5314                         return yaffs_DeleteDirectory(obj);
5315                         break;
5316                 case YAFFS_OBJECT_TYPE_SYMLINK:
5317                         return yaffs_DeleteSymLink(obj);
5318                         break;
5319                 case YAFFS_OBJECT_TYPE_SPECIAL:
5320                         return yaffs_DoGenericObjectDeletion(obj);
5321                         break;
5322                 case YAFFS_OBJECT_TYPE_HARDLINK:
5323                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5324                 default:
5325                         return YAFFS_FAIL;
5326                 }
5327         } else if(yaffs_IsNonEmptyDirectory(obj))
5328                 return YAFFS_FAIL;
5329         else
5330                 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5331                                            _Y("unlinked"), 0, 0);
5332 }
5333
5334
5335 static int yaffs_UnlinkObject(yaffs_Object *obj)
5336 {
5337
5338         if (obj && obj->unlinkAllowed)
5339                 return yaffs_UnlinkWorker(obj);
5340
5341         return YAFFS_FAIL;
5342
5343 }
5344 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5345 {
5346         yaffs_Object *obj;
5347
5348         obj = yaffs_FindObjectByName(dir, name);
5349         return yaffs_UnlinkObject(obj);
5350 }
5351
5352 /*----------------------- Initialisation Scanning ---------------------- */
5353
5354 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5355                                 int backwardScanning)
5356 {
5357         yaffs_Object *obj;
5358
5359         if (!backwardScanning) {
5360                 /* Handle YAFFS1 forward scanning case
5361                  * For YAFFS1 we always do the deletion
5362                  */
5363
5364         } else {
5365                 /* Handle YAFFS2 case (backward scanning)
5366                  * If the shadowed object exists then ignore.
5367                  */
5368                 obj = yaffs_FindObjectByNumber(dev, objId);
5369                 if(obj)
5370                         return;
5371         }
5372
5373         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5374          * We put it in unlinked dir to be cleaned up after the scanning
5375          */
5376         obj =
5377             yaffs_FindOrCreateObjectByNumber(dev, objId,
5378                                              YAFFS_OBJECT_TYPE_FILE);
5379         if (!obj)
5380                 return;
5381         obj->isShadowed = 1;
5382         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5383         obj->variant.fileVariant.shrinkSize = 0;
5384         obj->valid = 1;         /* So that we don't read any other info for this file */
5385
5386 }
5387
5388 typedef struct {
5389         int seq;
5390         int block;
5391 } yaffs_BlockIndex;
5392
5393
5394 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5395 {
5396         yaffs_Object *hl;
5397         yaffs_Object *in;
5398
5399         while (hardList) {
5400                 hl = hardList;
5401                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5402
5403                 in = yaffs_FindObjectByNumber(dev,
5404                                               hl->variant.hardLinkVariant.
5405                                               equivalentObjectId);
5406
5407                 if (in) {
5408                         /* Add the hardlink pointers */
5409                         hl->variant.hardLinkVariant.equivalentObject = in;
5410                         ylist_add(&hl->hardLinks, &in->hardLinks);
5411                 } else {
5412                         /* Todo Need to report/handle this better.
5413                          * Got a problem... hardlink to a non-existant object
5414                          */
5415                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5416                         YINIT_LIST_HEAD(&hl->hardLinks);
5417
5418                 }
5419         }
5420 }
5421
5422
5423
5424
5425
5426 static int ybicmp(const void *a, const void *b)
5427 {
5428         register int aseq = ((yaffs_BlockIndex *)a)->seq;
5429         register int bseq = ((yaffs_BlockIndex *)b)->seq;
5430         register int ablock = ((yaffs_BlockIndex *)a)->block;
5431         register int bblock = ((yaffs_BlockIndex *)b)->block;
5432         if (aseq == bseq)
5433                 return ablock - bblock;
5434         else
5435                 return aseq - bseq;
5436 }
5437
5438
5439 struct yaffs_ShadowFixerStruct {
5440         int objectId;
5441         int shadowedId;
5442         struct yaffs_ShadowFixerStruct *next;
5443 };
5444
5445
5446 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5447 {
5448         /*
5449         *  Sort out state of unlinked and deleted objects after scanning.
5450         */
5451         struct ylist_head *i;
5452         struct ylist_head *n;
5453         yaffs_Object *l;
5454
5455         /* Soft delete all the unlinked files */
5456         ylist_for_each_safe(i, n,
5457                 &dev->unlinkedDir->variant.directoryVariant.children) {
5458                 if (i) {
5459                         l = ylist_entry(i, yaffs_Object, siblings);
5460                         yaffs_DeleteObject(l);
5461                 }
5462         }
5463
5464         ylist_for_each_safe(i, n,
5465                 &dev->deletedDir->variant.directoryVariant.children) {
5466                 if (i) {
5467                         l = ylist_entry(i, yaffs_Object, siblings);
5468                         yaffs_DeleteObject(l);
5469                 }
5470         }
5471
5472 }
5473
5474 static int yaffs_Scan(yaffs_Device *dev)
5475 {
5476         yaffs_ExtendedTags tags;
5477         int blk;
5478         int blockIterator;
5479         int startIterator;
5480         int endIterator;
5481         int result;
5482
5483         int chunk;
5484         int c;
5485         int deleted;
5486         yaffs_BlockState state;
5487         yaffs_Object *hardList = NULL;
5488         yaffs_BlockInfo *bi;
5489         __u32 sequenceNumber;
5490         yaffs_ObjectHeader *oh;
5491         yaffs_Object *in;
5492         yaffs_Object *parent;
5493
5494         int alloc_failed = 0;
5495
5496         struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5497
5498
5499         __u8 *chunkData;
5500
5501
5502
5503         T(YAFFS_TRACE_SCAN,
5504           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
5505            dev->internalStartBlock, dev->internalEndBlock));
5506
5507         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5508
5509         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5510
5511         /* Scan all the blocks to determine their state */
5512         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5513                 bi = yaffs_GetBlockInfo(dev, blk);
5514                 yaffs_ClearChunkBits(dev, blk);
5515                 bi->pagesInUse = 0;
5516                 bi->softDeletions = 0;
5517
5518                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5519
5520                 bi->blockState = state;
5521                 bi->sequenceNumber = sequenceNumber;
5522
5523                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5524                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5525
5526                 T(YAFFS_TRACE_SCAN_DEBUG,
5527                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5528                    state, sequenceNumber));
5529
5530                 if (state == YAFFS_BLOCK_STATE_DEAD) {
5531                         T(YAFFS_TRACE_BAD_BLOCKS,
5532                           (TSTR("block %d is bad" TENDSTR), blk));
5533                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5534                         T(YAFFS_TRACE_SCAN_DEBUG,
5535                           (TSTR("Block empty " TENDSTR)));
5536                         dev->nErasedBlocks++;
5537                         dev->nFreeChunks += dev->nChunksPerBlock;
5538                 }
5539         }
5540
5541         startIterator = dev->internalStartBlock;
5542         endIterator = dev->internalEndBlock;
5543
5544         /* For each block.... */
5545         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5546              blockIterator++) {
5547
5548                 YYIELD();
5549
5550                 YYIELD();
5551
5552                 blk = blockIterator;
5553
5554                 bi = yaffs_GetBlockInfo(dev, blk);
5555                 state = bi->blockState;
5556
5557                 deleted = 0;
5558
5559                 /* For each chunk in each block that needs scanning....*/
5560                 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5561                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5562                         /* Read the tags and decide what to do */
5563                         chunk = blk * dev->nChunksPerBlock + c;
5564
5565                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5566                                                         &tags);
5567
5568                         /* Let's have a good look at this chunk... */
5569
5570                         if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5571                                 /* YAFFS1 only...
5572                                  * A deleted chunk
5573                                  */
5574                                 deleted++;
5575                                 dev->nFreeChunks++;
5576                                 /*T((" %d %d deleted\n",blk,c)); */
5577                         } else if (!tags.chunkUsed) {
5578                                 /* An unassigned chunk in the block
5579                                  * This means that either the block is empty or
5580                                  * this is the one being allocated from
5581                                  */
5582
5583                                 if (c == 0) {
5584                                         /* We're looking at the first chunk in the block so the block is unused */
5585                                         state = YAFFS_BLOCK_STATE_EMPTY;
5586                                         dev->nErasedBlocks++;
5587                                 } else {
5588                                         /* this is the block being allocated from */
5589                                         T(YAFFS_TRACE_SCAN,
5590                                           (TSTR
5591                                            (" Allocating from %d %d" TENDSTR),
5592                                            blk, c));
5593                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5594                                         dev->allocationBlock = blk;
5595                                         dev->allocationPage = c;
5596                                         dev->allocationBlockFinder = blk;
5597                                         /* Set it to here to encourage the allocator to go forth from here. */
5598
5599                                 }
5600
5601                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5602                         } else if (tags.chunkId > 0) {
5603                                 /* chunkId > 0 so it is a data chunk... */
5604                                 unsigned int endpos;
5605
5606                                 yaffs_SetChunkBit(dev, blk, c);
5607                                 bi->pagesInUse++;
5608
5609                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5610                                                                       tags.
5611                                                                       objectId,
5612                                                                       YAFFS_OBJECT_TYPE_FILE);
5613                                 /* PutChunkIntoFile checks for a clash (two data chunks with
5614                                  * the same chunkId).
5615                                  */
5616
5617                                 if (!in)
5618                                         alloc_failed = 1;
5619
5620                                 if (in) {
5621                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5622                                                 alloc_failed = 1;
5623                                 }
5624
5625                                 endpos =
5626                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5627                                     tags.byteCount;
5628                                 if (in &&
5629                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
5630                                     && in->variant.fileVariant.scannedFileSize <
5631                                     endpos) {
5632                                         in->variant.fileVariant.
5633                                             scannedFileSize = endpos;
5634                                         if (!dev->useHeaderFileSize) {
5635                                                 in->variant.fileVariant.
5636                                                     fileSize =
5637                                                     in->variant.fileVariant.
5638                                                     scannedFileSize;
5639                                         }
5640
5641                                 }
5642                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
5643                         } else {
5644                                 /* chunkId == 0, so it is an ObjectHeader.
5645                                  * Thus, we read in the object header and make the object
5646                                  */
5647                                 yaffs_SetChunkBit(dev, blk, c);
5648                                 bi->pagesInUse++;
5649
5650                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5651                                                                 chunkData,
5652                                                                 NULL);
5653
5654                                 oh = (yaffs_ObjectHeader *) chunkData;
5655
5656                                 in = yaffs_FindObjectByNumber(dev,
5657                                                               tags.objectId);
5658                                 if (in && in->variantType != oh->type) {
5659                                         /* This should not happen, but somehow
5660                                          * Wev'e ended up with an objectId that has been reused but not yet
5661                                          * deleted, and worse still it has changed type. Delete the old object.
5662                                          */
5663
5664                                         yaffs_DeleteObject(in);
5665
5666                                         in = 0;
5667                                 }
5668
5669                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5670                                                                       tags.
5671                                                                       objectId,
5672                                                                       oh->type);
5673
5674                                 if (!in)
5675                                         alloc_failed = 1;
5676
5677                                 if (in && oh->shadowsObject > 0) {
5678
5679                                         struct yaffs_ShadowFixerStruct *fixer;
5680                                         fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5681                                         if (fixer) {
5682                                                 fixer->next = shadowFixerList;
5683                                                 shadowFixerList = fixer;
5684                                                 fixer->objectId = tags.objectId;
5685                                                 fixer->shadowedId = oh->shadowsObject;
5686                                         }
5687
5688                                 }
5689
5690                                 if (in && in->valid) {
5691                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
5692
5693                                         unsigned existingSerial = in->serial;
5694                                         unsigned newSerial = tags.serialNumber;
5695
5696                                         if (((existingSerial + 1) & 3) == newSerial) {
5697                                                 /* Use new one - destroy the exisiting one */
5698                                                 yaffs_DeleteChunk(dev,
5699                                                                   in->hdrChunk,
5700                                                                   1, __LINE__);
5701                                                 in->valid = 0;
5702                                         } else {
5703                                                 /* Use existing - destroy this one. */
5704                                                 yaffs_DeleteChunk(dev, chunk, 1,
5705                                                                   __LINE__);
5706                                         }
5707                                 }
5708
5709                                 if (in && !in->valid &&
5710                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5711                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5712                                         /* We only load some info, don't fiddle with directory structure */
5713                                         in->valid = 1;
5714                                         in->variantType = oh->type;
5715
5716                                         in->yst_mode = oh->yst_mode;
5717 #ifdef CONFIG_YAFFS_WINCE
5718                                         in->win_atime[0] = oh->win_atime[0];
5719                                         in->win_ctime[0] = oh->win_ctime[0];
5720                                         in->win_mtime[0] = oh->win_mtime[0];
5721                                         in->win_atime[1] = oh->win_atime[1];
5722                                         in->win_ctime[1] = oh->win_ctime[1];
5723                                         in->win_mtime[1] = oh->win_mtime[1];
5724 #else
5725                                         in->yst_uid = oh->yst_uid;
5726                                         in->yst_gid = oh->yst_gid;
5727                                         in->yst_atime = oh->yst_atime;
5728                                         in->yst_mtime = oh->yst_mtime;
5729                                         in->yst_ctime = oh->yst_ctime;
5730                                         in->yst_rdev = oh->yst_rdev;
5731 #endif
5732                                         in->hdrChunk = chunk;
5733                                         in->serial = tags.serialNumber;
5734
5735                                 } else if (in && !in->valid) {
5736                                         /* we need to load this info */
5737
5738                                         in->valid = 1;
5739                                         in->variantType = oh->type;
5740
5741                                         in->yst_mode = oh->yst_mode;
5742 #ifdef CONFIG_YAFFS_WINCE
5743                                         in->win_atime[0] = oh->win_atime[0];
5744                                         in->win_ctime[0] = oh->win_ctime[0];
5745                                         in->win_mtime[0] = oh->win_mtime[0];
5746                                         in->win_atime[1] = oh->win_atime[1];
5747                                         in->win_ctime[1] = oh->win_ctime[1];
5748                                         in->win_mtime[1] = oh->win_mtime[1];
5749 #else
5750                                         in->yst_uid = oh->yst_uid;
5751                                         in->yst_gid = oh->yst_gid;
5752                                         in->yst_atime = oh->yst_atime;
5753                                         in->yst_mtime = oh->yst_mtime;
5754                                         in->yst_ctime = oh->yst_ctime;
5755                                         in->yst_rdev = oh->yst_rdev;
5756 #endif
5757                                         in->hdrChunk = chunk;
5758                                         in->serial = tags.serialNumber;
5759
5760                                         yaffs_SetObjectName(in, oh->name);
5761                                         in->dirty = 0;
5762
5763                                         /* directory stuff...
5764                                          * hook up to parent
5765                                          */
5766
5767                                         parent =
5768                                             yaffs_FindOrCreateObjectByNumber
5769                                             (dev, oh->parentObjectId,
5770                                              YAFFS_OBJECT_TYPE_DIRECTORY);
5771                                         if (!parent)
5772                                                 alloc_failed = 1;
5773                                         if (parent && parent->variantType ==
5774                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
5775                                                 /* Set up as a directory */
5776                                                 parent->variantType =
5777                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
5778                                                 YINIT_LIST_HEAD(&parent->variant.
5779                                                                 directoryVariant.
5780                                                                 children);
5781                                         } else if (!parent || parent->variantType !=
5782                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
5783                                                 /* Hoosterman, another problem....
5784                                                  * We're trying to use a non-directory as a directory
5785                                                  */
5786
5787                                                 T(YAFFS_TRACE_ERROR,
5788                                                   (TSTR
5789                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
5790                                                     TENDSTR)));
5791                                                 parent = dev->lostNFoundDir;
5792                                         }
5793
5794                                         yaffs_AddObjectToDirectory(parent, in);
5795
5796                                         if (0 && (parent == dev->deletedDir ||
5797                                                   parent == dev->unlinkedDir)) {
5798                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
5799                                                 dev->nDeletedFiles++;
5800                                         }
5801                                         /* Note re hardlinks.
5802                                          * Since we might scan a hardlink before its equivalent object is scanned
5803                                          * we put them all in a list.
5804                                          * After scanning is complete, we should have all the objects, so we run through this
5805                                          * list and fix up all the chains.
5806                                          */
5807
5808                                         switch (in->variantType) {
5809                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
5810                                                 /* Todo got a problem */
5811                                                 break;
5812                                         case YAFFS_OBJECT_TYPE_FILE:
5813                                                 if (dev->useHeaderFileSize)
5814
5815                                                         in->variant.fileVariant.
5816                                                             fileSize =
5817                                                             oh->fileSize;
5818
5819                                                 break;
5820                                         case YAFFS_OBJECT_TYPE_HARDLINK:
5821                                                 in->variant.hardLinkVariant.
5822                                                         equivalentObjectId =
5823                                                         oh->equivalentObjectId;
5824                                                 in->hardLinks.next =
5825                                                         (struct ylist_head *)
5826                                                         hardList;
5827                                                 hardList = in;
5828                                                 break;
5829                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
5830                                                 /* Do nothing */
5831                                                 break;
5832                                         case YAFFS_OBJECT_TYPE_SPECIAL:
5833                                                 /* Do nothing */
5834                                                 break;
5835                                         case YAFFS_OBJECT_TYPE_SYMLINK:
5836                                                 in->variant.symLinkVariant.alias =
5837                                                     yaffs_CloneString(oh->alias);
5838                                                 if (!in->variant.symLinkVariant.alias)
5839                                                         alloc_failed = 1;
5840                                                 break;
5841                                         }
5842
5843 /*
5844                                         if (parent == dev->deletedDir) {
5845                                                 yaffs_DestroyObject(in);
5846                                                 bi->hasShrinkHeader = 1;
5847                                         }
5848 */
5849                                 }
5850                         }
5851                 }
5852
5853                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5854                         /* If we got this far while scanning, then the block is fully allocated.*/
5855                         state = YAFFS_BLOCK_STATE_FULL;
5856                 }
5857
5858                 bi->blockState = state;
5859
5860                 /* Now let's see if it was dirty */
5861                 if (bi->pagesInUse == 0 &&
5862                     !bi->hasShrinkHeader &&
5863                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5864                         yaffs_BlockBecameDirty(dev, blk);
5865                 }
5866
5867         }
5868
5869
5870         /* Ok, we've done all the scanning.
5871          * Fix up the hard link chains.
5872          * We should now have scanned all the objects, now it's time to add these
5873          * hardlinks.
5874          */
5875
5876         yaffs_HardlinkFixup(dev, hardList);
5877
5878         /* Fix up any shadowed objects */
5879         {
5880                 struct yaffs_ShadowFixerStruct *fixer;
5881                 yaffs_Object *obj;
5882
5883                 while (shadowFixerList) {
5884                         fixer = shadowFixerList;
5885                         shadowFixerList = fixer->next;
5886                         /* Complete the rename transaction by deleting the shadowed object
5887                          * then setting the object header to unshadowed.
5888                          */
5889                         obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
5890                         if (obj)
5891                                 yaffs_DeleteObject(obj);
5892
5893                         obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
5894
5895                         if (obj)
5896                                 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
5897
5898                         YFREE(fixer);
5899                 }
5900         }
5901
5902         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5903
5904         if (alloc_failed)
5905                 return YAFFS_FAIL;
5906
5907         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5908
5909
5910         return YAFFS_OK;
5911 }
5912
5913 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5914 {
5915         __u8 *chunkData;
5916         yaffs_ObjectHeader *oh;
5917         yaffs_Device *dev;
5918         yaffs_ExtendedTags tags;
5919         int result;
5920         int alloc_failed = 0;
5921
5922         if (!in)
5923                 return;
5924
5925         dev = in->myDev;
5926
5927 #if 0
5928         T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
5929                 in->objectId,
5930                 in->lazyLoaded ? "not yet" : "already"));
5931 #endif
5932
5933         if (in->lazyLoaded && in->hdrChunk > 0) {
5934                 in->lazyLoaded = 0;
5935                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5936
5937                 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
5938                 oh = (yaffs_ObjectHeader *) chunkData;
5939
5940                 in->yst_mode = oh->yst_mode;
5941 #ifdef CONFIG_YAFFS_WINCE
5942                 in->win_atime[0] = oh->win_atime[0];
5943                 in->win_ctime[0] = oh->win_ctime[0];
5944                 in->win_mtime[0] = oh->win_mtime[0];
5945                 in->win_atime[1] = oh->win_atime[1];
5946                 in->win_ctime[1] = oh->win_ctime[1];
5947                 in->win_mtime[1] = oh->win_mtime[1];
5948 #else
5949                 in->yst_uid = oh->yst_uid;
5950                 in->yst_gid = oh->yst_gid;
5951                 in->yst_atime = oh->yst_atime;
5952                 in->yst_mtime = oh->yst_mtime;
5953                 in->yst_ctime = oh->yst_ctime;
5954                 in->yst_rdev = oh->yst_rdev;
5955
5956 #endif
5957                 yaffs_SetObjectName(in, oh->name);
5958
5959                 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5960                         in->variant.symLinkVariant.alias =
5961                                                     yaffs_CloneString(oh->alias);
5962                         if (!in->variant.symLinkVariant.alias)
5963                                 alloc_failed = 1; /* Not returned to caller */
5964                 }
5965
5966                 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5967         }
5968 }
5969
5970 static int yaffs_ScanBackwards(yaffs_Device *dev)
5971 {
5972         yaffs_ExtendedTags tags;
5973         int blk;
5974         int blockIterator;
5975         int startIterator;
5976         int endIterator;
5977         int nBlocksToScan = 0;
5978
5979         int chunk;
5980         int result;
5981         int c;
5982         int deleted;
5983         yaffs_BlockState state;
5984         yaffs_Object *hardList = NULL;
5985         yaffs_BlockInfo *bi;
5986         __u32 sequenceNumber;
5987         yaffs_ObjectHeader *oh;
5988         yaffs_Object *in;
5989         yaffs_Object *parent;
5990         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5991         int itsUnlinked;
5992         __u8 *chunkData;
5993
5994         int fileSize;
5995         int isShrink;
5996         int foundChunksInBlock;
5997         int equivalentObjectId;
5998         int alloc_failed = 0;
5999
6000
6001         yaffs_BlockIndex *blockIndex = NULL;
6002         int altBlockIndex = 0;
6003
6004         if (!dev->isYaffs2) {
6005                 T(YAFFS_TRACE_SCAN,
6006                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6007                 return YAFFS_FAIL;
6008         }
6009
6010         T(YAFFS_TRACE_SCAN,
6011           (TSTR
6012            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
6013             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6014
6015
6016         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6017
6018         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6019
6020         if (!blockIndex) {
6021                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6022                 altBlockIndex = 1;
6023         }
6024
6025         if (!blockIndex) {
6026                 T(YAFFS_TRACE_SCAN,
6027                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6028                 return YAFFS_FAIL;
6029         }
6030
6031         dev->blocksInCheckpoint = 0;
6032
6033         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6034
6035         /* Scan all the blocks to determine their state */
6036         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6037                 bi = yaffs_GetBlockInfo(dev, blk);
6038                 yaffs_ClearChunkBits(dev, blk);
6039                 bi->pagesInUse = 0;
6040                 bi->softDeletions = 0;
6041
6042                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6043
6044                 bi->blockState = state;
6045                 bi->sequenceNumber = sequenceNumber;
6046
6047                 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6048                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6049                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6050                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6051
6052                 T(YAFFS_TRACE_SCAN_DEBUG,
6053                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6054                    state, sequenceNumber));
6055
6056
6057                 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6058                         dev->blocksInCheckpoint++;
6059
6060                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6061                         T(YAFFS_TRACE_BAD_BLOCKS,
6062                           (TSTR("block %d is bad" TENDSTR), blk));
6063                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6064                         T(YAFFS_TRACE_SCAN_DEBUG,
6065                           (TSTR("Block empty " TENDSTR)));
6066                         dev->nErasedBlocks++;
6067                         dev->nFreeChunks += dev->nChunksPerBlock;
6068                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6069
6070                         /* Determine the highest sequence number */
6071                         if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6072                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6073
6074                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
6075                                 blockIndex[nBlocksToScan].block = blk;
6076
6077                                 nBlocksToScan++;
6078
6079                                 if (sequenceNumber >= dev->sequenceNumber)
6080                                         dev->sequenceNumber = sequenceNumber;
6081                         } else {
6082                                 /* TODO: Nasty sequence number! */
6083                                 T(YAFFS_TRACE_SCAN,
6084                                   (TSTR
6085                                    ("Block scanning block %d has bad sequence number %d"
6086                                     TENDSTR), blk, sequenceNumber));
6087
6088                         }
6089                 }
6090         }
6091
6092         T(YAFFS_TRACE_SCAN,
6093         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6094
6095
6096
6097         YYIELD();
6098
6099         /* Sort the blocks */
6100 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6101         {
6102                 /* Use qsort now. */
6103                 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6104         }
6105 #else
6106         {
6107                 /* Dungy old bubble sort... */
6108
6109                 yaffs_BlockIndex temp;
6110                 int i;
6111                 int j;
6112
6113                 for (i = 0; i < nBlocksToScan; i++)
6114                         for (j = i + 1; j < nBlocksToScan; j++)
6115                                 if (blockIndex[i].seq > blockIndex[j].seq) {
6116                                         temp = blockIndex[j];
6117                                         blockIndex[j] = blockIndex[i];
6118                                         blockIndex[i] = temp;
6119                                 }
6120         }
6121 #endif
6122
6123         YYIELD();
6124
6125         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6126
6127         /* Now scan the blocks looking at the data. */
6128         startIterator = 0;
6129         endIterator = nBlocksToScan - 1;
6130         T(YAFFS_TRACE_SCAN_DEBUG,
6131           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6132
6133         /* For each block.... backwards */
6134         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6135                         blockIterator--) {
6136                 /* Cooperative multitasking! This loop can run for so
6137                    long that watchdog timers expire. */
6138                 YYIELD();
6139
6140                 /* get the block to scan in the correct order */
6141                 blk = blockIndex[blockIterator].block;
6142
6143                 bi = yaffs_GetBlockInfo(dev, blk);
6144
6145
6146                 state = bi->blockState;
6147
6148                 deleted = 0;
6149
6150                 /* For each chunk in each block that needs scanning.... */
6151                 foundChunksInBlock = 0;
6152                 for (c = dev->nChunksPerBlock - 1;
6153                      !alloc_failed && c >= 0 &&
6154                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6155                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6156                         /* Scan backwards...
6157                          * Read the tags and decide what to do
6158                          */
6159
6160                         chunk = blk * dev->nChunksPerBlock + c;
6161
6162                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6163                                                         &tags);
6164
6165                         /* Let's have a good look at this chunk... */
6166
6167                         if (!tags.chunkUsed) {
6168                                 /* An unassigned chunk in the block.
6169                                  * If there are used chunks after this one, then
6170                                  * it is a chunk that was skipped due to failing the erased
6171                                  * check. Just skip it so that it can be deleted.
6172                                  * But, more typically, We get here when this is an unallocated
6173                                  * chunk and his means that either the block is empty or
6174                                  * this is the one being allocated from
6175                                  */
6176
6177                                 if (foundChunksInBlock) {
6178                                         /* This is a chunk that was skipped due to failing the erased check */
6179                                 } else if (c == 0) {
6180                                         /* We're looking at the first chunk in the block so the block is unused */
6181                                         state = YAFFS_BLOCK_STATE_EMPTY;
6182                                         dev->nErasedBlocks++;
6183                                 } else {
6184                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6185                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6186                                                 if (dev->sequenceNumber == bi->sequenceNumber) {
6187                                                         /* this is the block being allocated from */
6188
6189                                                         T(YAFFS_TRACE_SCAN,
6190                                                           (TSTR
6191                                                            (" Allocating from %d %d"
6192                                                             TENDSTR), blk, c));
6193
6194                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6195                                                         dev->allocationBlock = blk;
6196                                                         dev->allocationPage = c;
6197                                                         dev->allocationBlockFinder = blk;
6198                                                 } else {
6199                                                         /* This is a partially written block that is not
6200                                                          * the current allocation block. This block must have
6201                                                          * had a write failure, so set up for retirement.
6202                                                          */
6203
6204                                                          /* bi->needsRetiring = 1; ??? TODO */
6205                                                          bi->gcPrioritise = 1;
6206
6207                                                          T(YAFFS_TRACE_ALWAYS,
6208                                                          (TSTR("Partially written block %d detected" TENDSTR),
6209                                                          blk));
6210                                                 }
6211                                         }
6212                                 }
6213
6214                                 dev->nFreeChunks++;
6215
6216                         } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6217                                 T(YAFFS_TRACE_SCAN,
6218                                   (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6219                                   blk, c));
6220
6221                                   dev->nFreeChunks++;
6222
6223                         } else if (tags.chunkId > 0) {
6224                                 /* chunkId > 0 so it is a data chunk... */
6225                                 unsigned int endpos;
6226                                 __u32 chunkBase =
6227                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6228
6229                                 foundChunksInBlock = 1;
6230
6231
6232                                 yaffs_SetChunkBit(dev, blk, c);
6233                                 bi->pagesInUse++;
6234
6235                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6236                                                                       tags.
6237                                                                       objectId,
6238                                                                       YAFFS_OBJECT_TYPE_FILE);
6239                                 if (!in) {
6240                                         /* Out of memory */
6241                                         alloc_failed = 1;
6242                                 }
6243
6244                                 if (in &&
6245                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6246                                     && chunkBase <
6247                                     in->variant.fileVariant.shrinkSize) {
6248                                         /* This has not been invalidated by a resize */
6249                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
6250                                                                chunk, -1)) {
6251                                                 alloc_failed = 1;
6252                                         }
6253
6254                                         /* File size is calculated by looking at the data chunks if we have not
6255                                          * seen an object header yet. Stop this practice once we find an object header.
6256                                          */
6257                                         endpos =
6258                                             (tags.chunkId -
6259                                              1) * dev->nDataBytesPerChunk +
6260                                             tags.byteCount;
6261
6262                                         if (!in->valid &&       /* have not got an object header yet */
6263                                             in->variant.fileVariant.
6264                                             scannedFileSize < endpos) {
6265                                                 in->variant.fileVariant.
6266                                                     scannedFileSize = endpos;
6267                                                 in->variant.fileVariant.
6268                                                     fileSize =
6269                                                     in->variant.fileVariant.
6270                                                     scannedFileSize;
6271                                         }
6272
6273                                 } else if (in) {
6274                                         /* This chunk has been invalidated by a resize, so delete */
6275                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6276
6277                                 }
6278                         } else {
6279                                 /* chunkId == 0, so it is an ObjectHeader.
6280                                  * Thus, we read in the object header and make the object
6281                                  */
6282                                 foundChunksInBlock = 1;
6283
6284                                 yaffs_SetChunkBit(dev, blk, c);
6285                                 bi->pagesInUse++;
6286
6287                                 oh = NULL;
6288                                 in = NULL;
6289
6290                                 if (tags.extraHeaderInfoAvailable) {
6291                                         in = yaffs_FindOrCreateObjectByNumber
6292                                             (dev, tags.objectId,
6293                                              tags.extraObjectType);
6294                                         if (!in)
6295                                                 alloc_failed = 1;
6296                                 }
6297
6298                                 if (!in ||
6299                                     (!in->valid && dev->disableLazyLoad) ||
6300                                     tags.extraShadows ||
6301                                     (!in->valid &&
6302                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6303                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6304
6305                                         /* If we don't have  valid info then we need to read the chunk
6306                                          * TODO In future we can probably defer reading the chunk and
6307                                          * living with invalid data until needed.
6308                                          */
6309
6310                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6311                                                                         chunk,
6312                                                                         chunkData,
6313                                                                         NULL);
6314
6315                                         oh = (yaffs_ObjectHeader *) chunkData;
6316
6317                                         if (dev->inbandTags) {
6318                                                 /* Fix up the header if they got corrupted by inband tags */
6319                                                 oh->shadowsObject = oh->inbandShadowsObject;
6320                                                 oh->isShrink = oh->inbandIsShrink;
6321                                         }
6322
6323                                         if (!in) {
6324                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6325                                                 if (!in)
6326                                                         alloc_failed = 1;
6327                                         }
6328
6329                                 }
6330
6331                                 if (!in) {
6332                                         /* TODO Hoosterman we have a problem! */
6333                                         T(YAFFS_TRACE_ERROR,
6334                                           (TSTR
6335                                            ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
6336                                             TENDSTR), tags.objectId, chunk));
6337                                         continue;
6338                                 }
6339
6340                                 if (in->valid) {
6341                                         /* We have already filled this one.
6342                                          * We have a duplicate that will be discarded, but
6343                                          * we first have to suck out resize info if it is a file.
6344                                          */
6345
6346                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6347                                              ((oh &&
6348                                                oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6349                                               (tags.extraHeaderInfoAvailable  &&
6350                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6351                                                 __u32 thisSize =
6352                                                     (oh) ? oh->fileSize : tags.
6353                                                     extraFileLength;
6354                                                 __u32 parentObjectId =
6355                                                     (oh) ? oh->
6356                                                     parentObjectId : tags.
6357                                                     extraParentObjectId;
6358
6359
6360                                                 isShrink =
6361                                                     (oh) ? oh->isShrink : tags.
6362                                                     extraIsShrinkHeader;
6363
6364                                                 /* If it is deleted (unlinked at start also means deleted)
6365                                                  * we treat the file size as being zeroed at this point.
6366                                                  */
6367                                                 if (parentObjectId ==
6368                                                     YAFFS_OBJECTID_DELETED
6369                                                     || parentObjectId ==
6370                                                     YAFFS_OBJECTID_UNLINKED) {
6371                                                         thisSize = 0;
6372                                                         isShrink = 1;
6373                                                 }
6374
6375                                                 if (isShrink &&
6376                                                     in->variant.fileVariant.
6377                                                     shrinkSize > thisSize) {
6378                                                         in->variant.fileVariant.
6379                                                             shrinkSize =
6380                                                             thisSize;
6381                                                 }
6382
6383                                                 if (isShrink)
6384                                                         bi->hasShrinkHeader = 1;
6385
6386                                         }
6387                                         /* Use existing - destroy this one. */
6388                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6389
6390                                 }
6391
6392                                 if (!in->valid && in->variantType !=
6393                                     (oh ? oh->type : tags.extraObjectType))
6394                                         T(YAFFS_TRACE_ERROR, (
6395                                                 TSTR("yaffs tragedy: Bad object type, "
6396                                             TCONT("%d != %d, for object %d at chunk ")
6397                                             TCONT("%d during scan")
6398                                                 TENDSTR), oh ?
6399                                             oh->type : tags.extraObjectType,
6400                                             in->variantType, tags.objectId,
6401                                             chunk));
6402
6403                                 if (!in->valid &&
6404                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6405                                      tags.objectId ==
6406                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6407                                         /* We only load some info, don't fiddle with directory structure */
6408                                         in->valid = 1;
6409
6410                                         if (oh) {
6411                                                 in->variantType = oh->type;
6412
6413                                                 in->yst_mode = oh->yst_mode;
6414 #ifdef CONFIG_YAFFS_WINCE
6415                                                 in->win_atime[0] = oh->win_atime[0];
6416                                                 in->win_ctime[0] = oh->win_ctime[0];
6417                                                 in->win_mtime[0] = oh->win_mtime[0];
6418                                                 in->win_atime[1] = oh->win_atime[1];
6419                                                 in->win_ctime[1] = oh->win_ctime[1];
6420                                                 in->win_mtime[1] = oh->win_mtime[1];
6421 #else
6422                                                 in->yst_uid = oh->yst_uid;
6423                                                 in->yst_gid = oh->yst_gid;
6424                                                 in->yst_atime = oh->yst_atime;
6425                                                 in->yst_mtime = oh->yst_mtime;
6426                                                 in->yst_ctime = oh->yst_ctime;
6427                                                 in->yst_rdev = oh->yst_rdev;
6428
6429 #endif
6430                                         } else {
6431                                                 in->variantType = tags.extraObjectType;
6432                                                 in->lazyLoaded = 1;
6433                                         }
6434
6435                                         in->hdrChunk = chunk;
6436
6437                                 } else if (!in->valid) {
6438                                         /* we need to load this info */
6439
6440                                         in->valid = 1;
6441                                         in->hdrChunk = chunk;
6442
6443                                         if (oh) {
6444                                                 in->variantType = oh->type;
6445
6446                                                 in->yst_mode = oh->yst_mode;
6447 #ifdef CONFIG_YAFFS_WINCE
6448                                                 in->win_atime[0] = oh->win_atime[0];
6449                                                 in->win_ctime[0] = oh->win_ctime[0];
6450                                                 in->win_mtime[0] = oh->win_mtime[0];
6451                                                 in->win_atime[1] = oh->win_atime[1];
6452                                                 in->win_ctime[1] = oh->win_ctime[1];
6453                                                 in->win_mtime[1] = oh->win_mtime[1];
6454 #else
6455                                                 in->yst_uid = oh->yst_uid;
6456                                                 in->yst_gid = oh->yst_gid;
6457                                                 in->yst_atime = oh->yst_atime;
6458                                                 in->yst_mtime = oh->yst_mtime;
6459                                                 in->yst_ctime = oh->yst_ctime;
6460                                                 in->yst_rdev = oh->yst_rdev;
6461 #endif
6462
6463                                                 if (oh->shadowsObject > 0)
6464                                                         yaffs_HandleShadowedObject(dev,
6465                                                                            oh->
6466                                                                            shadowsObject,
6467                                                                            1);
6468
6469
6470                                                 yaffs_SetObjectName(in, oh->name);
6471                                                 parent =
6472                                                     yaffs_FindOrCreateObjectByNumber
6473                                                         (dev, oh->parentObjectId,
6474                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6475
6476                                                  fileSize = oh->fileSize;
6477                                                  isShrink = oh->isShrink;
6478                                                  equivalentObjectId = oh->equivalentObjectId;
6479
6480                                         } else {
6481                                                 in->variantType = tags.extraObjectType;
6482                                                 parent =
6483                                                     yaffs_FindOrCreateObjectByNumber
6484                                                         (dev, tags.extraParentObjectId,
6485                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6486                                                  fileSize = tags.extraFileLength;
6487                                                  isShrink = tags.extraIsShrinkHeader;
6488                                                  equivalentObjectId = tags.extraEquivalentObjectId;
6489                                                 in->lazyLoaded = 1;
6490
6491                                         }
6492                                         in->dirty = 0;
6493
6494                                         if (!parent)
6495                                                 alloc_failed = 1;
6496
6497                                         /* directory stuff...
6498                                          * hook up to parent
6499                                          */
6500
6501                                         if (parent && parent->variantType ==
6502                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6503                                                 /* Set up as a directory */
6504                                                 parent->variantType =
6505                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6506                                                 YINIT_LIST_HEAD(&parent->variant.
6507                                                         directoryVariant.
6508                                                         children);
6509                                         } else if (!parent || parent->variantType !=
6510                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6511                                                 /* Hoosterman, another problem....
6512                                                  * We're trying to use a non-directory as a directory
6513                                                  */
6514
6515                                                 T(YAFFS_TRACE_ERROR,
6516                                                   (TSTR
6517                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6518                                                     TENDSTR)));
6519                                                 parent = dev->lostNFoundDir;
6520                                         }
6521
6522                                         yaffs_AddObjectToDirectory(parent, in);
6523
6524                                         itsUnlinked = (parent == dev->deletedDir) ||
6525                                                       (parent == dev->unlinkedDir);
6526
6527                                         if (isShrink) {
6528                                                 /* Mark the block as having a shrinkHeader */
6529                                                 bi->hasShrinkHeader = 1;
6530                                         }
6531
6532                                         /* Note re hardlinks.
6533                                          * Since we might scan a hardlink before its equivalent object is scanned
6534                                          * we put them all in a list.
6535                                          * After scanning is complete, we should have all the objects, so we run
6536                                          * through this list and fix up all the chains.
6537                                          */
6538
6539                                         switch (in->variantType) {
6540                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6541                                                 /* Todo got a problem */
6542                                                 break;
6543                                         case YAFFS_OBJECT_TYPE_FILE:
6544
6545                                                 if (in->variant.fileVariant.
6546                                                     scannedFileSize < fileSize) {
6547                                                         /* This covers the case where the file size is greater
6548                                                          * than where the data is
6549                                                          * This will happen if the file is resized to be larger
6550                                                          * than its current data extents.
6551                                                          */
6552                                                         in->variant.fileVariant.fileSize = fileSize;
6553                                                         in->variant.fileVariant.scannedFileSize =
6554                                                             in->variant.fileVariant.fileSize;
6555                                                 }
6556
6557                                                 if (isShrink &&
6558                                                     in->variant.fileVariant.shrinkSize > fileSize) {
6559                                                         in->variant.fileVariant.shrinkSize = fileSize;
6560                                                 }
6561
6562                                                 break;
6563                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6564                                                 if (!itsUnlinked) {
6565                                                         in->variant.hardLinkVariant.equivalentObjectId =
6566                                                                 equivalentObjectId;
6567                                                         in->hardLinks.next =
6568                                                                 (struct ylist_head *) hardList;
6569                                                         hardList = in;
6570                                                 }
6571                                                 break;
6572                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6573                                                 /* Do nothing */
6574                                                 break;
6575                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6576                                                 /* Do nothing */
6577                                                 break;
6578                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6579                                                 if (oh) {
6580                                                         in->variant.symLinkVariant.alias =
6581                                                                 yaffs_CloneString(oh->alias);
6582                                                         if (!in->variant.symLinkVariant.alias)
6583                                                                 alloc_failed = 1;
6584                                                 }
6585                                                 break;
6586                                         }
6587
6588                                 }
6589
6590                         }
6591
6592                 } /* End of scanning for each chunk */
6593
6594                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6595                         /* If we got this far while scanning, then the block is fully allocated. */
6596                         state = YAFFS_BLOCK_STATE_FULL;
6597                 }
6598
6599                 bi->blockState = state;
6600
6601                 /* Now let's see if it was dirty */
6602                 if (bi->pagesInUse == 0 &&
6603                     !bi->hasShrinkHeader &&
6604                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6605                         yaffs_BlockBecameDirty(dev, blk);
6606                 }
6607
6608         }
6609
6610         if (altBlockIndex)
6611                 YFREE_ALT(blockIndex);
6612         else
6613                 YFREE(blockIndex);
6614
6615         /* Ok, we've done all the scanning.
6616          * Fix up the hard link chains.
6617          * We should now have scanned all the objects, now it's time to add these
6618          * hardlinks.
6619          */
6620         yaffs_HardlinkFixup(dev, hardList);
6621
6622
6623         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6624
6625         if (alloc_failed)
6626                 return YAFFS_FAIL;
6627
6628         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6629
6630         return YAFFS_OK;
6631 }
6632
6633 /*------------------------------  Directory Functions ----------------------------- */
6634
6635 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6636 {
6637         struct ylist_head *lh;
6638         yaffs_Object *listObj;
6639
6640         int count = 0;
6641
6642         if (!obj) {
6643                 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6644                 YBUG();
6645                 return;
6646         }
6647
6648         if (yaffs_SkipVerification(obj->myDev))
6649                 return;
6650
6651         if (!obj->parent) {
6652                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6653                 YBUG();
6654                 return;
6655         }
6656
6657         if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6658                 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6659                 YBUG();
6660         }
6661
6662         /* Iterate through the objects in each hash entry */
6663
6664         ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6665                 if (lh) {
6666                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6667                         yaffs_VerifyObject(listObj);
6668                         if (obj == listObj)
6669                                 count++;
6670                 }
6671          }
6672
6673         if (count != 1) {
6674                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6675                 YBUG();
6676         }
6677 }
6678
6679 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6680 {
6681         struct ylist_head *lh;
6682         yaffs_Object *listObj;
6683
6684         if (!directory) {
6685                 YBUG();
6686                 return;
6687         }
6688
6689         if (yaffs_SkipFullVerification(directory->myDev))
6690                 return;
6691
6692         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6693                 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6694                 YBUG();
6695         }
6696
6697         /* Iterate through the objects in each hash entry */
6698
6699         ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6700                 if (lh) {
6701                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6702                         if (listObj->parent != directory) {
6703                                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6704                                 YBUG();
6705                         }
6706                         yaffs_VerifyObjectInDirectory(listObj);
6707                 }
6708         }
6709 }
6710
6711 /*
6712  *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6713  * link (ie. name) is created or deleted in the directory.
6714  *
6715  * ie.
6716  *   create dir/a : update dir's mtime/ctime
6717  *   rm dir/a:   update dir's mtime/ctime
6718  *   modify dir/a: don't update dir's mtimme/ctime
6719  */
6720
6721 static void yaffs_UpdateParent(yaffs_Object *obj)
6722 {
6723         if(!obj)
6724                 return;
6725
6726         obj->dirty = 1;
6727         obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
6728
6729         yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
6730 }
6731
6732 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
6733 {
6734         yaffs_Device *dev = obj->myDev;
6735         yaffs_Object *parent;
6736
6737         yaffs_VerifyObjectInDirectory(obj);
6738         parent = obj->parent;
6739
6740         yaffs_VerifyDirectory(parent);
6741
6742         if (dev && dev->removeObjectCallback)
6743                 dev->removeObjectCallback(obj);
6744
6745
6746         ylist_del_init(&obj->siblings);
6747         obj->parent = NULL;
6748
6749         yaffs_VerifyDirectory(parent);
6750 }
6751
6752 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
6753                                         yaffs_Object *obj)
6754 {
6755         if (!directory) {
6756                 T(YAFFS_TRACE_ALWAYS,
6757                   (TSTR
6758                    ("tragedy: Trying to add an object to a null pointer directory"
6759                     TENDSTR)));
6760                 YBUG();
6761                 return;
6762         }
6763         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6764                 T(YAFFS_TRACE_ALWAYS,
6765                   (TSTR
6766                    ("tragedy: Trying to add an object to a non-directory"
6767                     TENDSTR)));
6768                 YBUG();
6769         }
6770
6771         if (obj->siblings.prev == NULL) {
6772                 /* Not initialised */
6773                 YBUG();
6774         }
6775
6776
6777         yaffs_VerifyDirectory(directory);
6778
6779         yaffs_RemoveObjectFromDirectory(obj);
6780
6781
6782         /* Now add it */
6783         ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
6784         obj->parent = directory;
6785
6786         if (directory == obj->myDev->unlinkedDir
6787                         || directory == obj->myDev->deletedDir) {
6788                 obj->unlinked = 1;
6789                 obj->myDev->nUnlinkedFiles++;
6790                 obj->renameAllowed = 0;
6791         }
6792
6793         yaffs_VerifyDirectory(directory);
6794         yaffs_VerifyObjectInDirectory(obj);
6795 }
6796
6797 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
6798                                      const YCHAR *name)
6799 {
6800         int sum;
6801
6802         struct ylist_head *i;
6803         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6804
6805         yaffs_Object *l;
6806
6807         if (!name)
6808                 return NULL;
6809
6810         if (!directory) {
6811                 T(YAFFS_TRACE_ALWAYS,
6812                   (TSTR
6813                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6814                     TENDSTR)));
6815                 YBUG();
6816                 return NULL;
6817         }
6818         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6819                 T(YAFFS_TRACE_ALWAYS,
6820                   (TSTR
6821                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6822                 YBUG();
6823         }
6824
6825         sum = yaffs_CalcNameSum(name);
6826
6827         ylist_for_each(i, &directory->variant.directoryVariant.children) {
6828                 if (i) {
6829                         l = ylist_entry(i, yaffs_Object, siblings);
6830
6831                         if (l->parent != directory)
6832                                 YBUG();
6833
6834                         yaffs_CheckObjectDetailsLoaded(l);
6835
6836                         /* Special case for lost-n-found */
6837                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6838                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
6839                                         return l;
6840                         } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
6841                                 /* LostnFound chunk called Objxxx
6842                                  * Do a real check
6843                                  */
6844                                 yaffs_GetObjectName(l, buffer,
6845                                                     YAFFS_MAX_NAME_LENGTH + 1);
6846                                 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
6847                                         return l;
6848                         }
6849                 }
6850         }
6851
6852         return NULL;
6853 }
6854
6855
6856 #if 0
6857 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
6858                                         int (*fn) (yaffs_Object *))
6859 {
6860         struct ylist_head *i;
6861         yaffs_Object *l;
6862
6863         if (!theDir) {
6864                 T(YAFFS_TRACE_ALWAYS,
6865                   (TSTR
6866                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6867                     TENDSTR)));
6868                 YBUG();
6869                 return YAFFS_FAIL;
6870         }
6871         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6872                 T(YAFFS_TRACE_ALWAYS,
6873                   (TSTR
6874                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6875                 YBUG();
6876                 return YAFFS_FAIL;
6877         }
6878
6879         ylist_for_each(i, &theDir->variant.directoryVariant.children) {
6880                 if (i) {
6881                         l = ylist_entry(i, yaffs_Object, siblings);
6882                         if (l && !fn(l))
6883                                 return YAFFS_FAIL;
6884                 }
6885         }
6886
6887         return YAFFS_OK;
6888
6889 }
6890 #endif
6891
6892 /* GetEquivalentObject dereferences any hard links to get to the
6893  * actual object.
6894  */
6895
6896 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
6897 {
6898         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6899                 /* We want the object id of the equivalent object, not this one */
6900                 obj = obj->variant.hardLinkVariant.equivalentObject;
6901                 yaffs_CheckObjectDetailsLoaded(obj);
6902         }
6903         return obj;
6904 }
6905
6906 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
6907 {
6908         memset(name, 0, buffSize * sizeof(YCHAR));
6909
6910         yaffs_CheckObjectDetailsLoaded(obj);
6911
6912         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6913                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6914         } else if (obj->hdrChunk <= 0) {
6915                 YCHAR locName[20];
6916                 YCHAR numString[20];
6917                 YCHAR *x = &numString[19];
6918                 unsigned v = obj->objectId;
6919                 numString[19] = 0;
6920                 while (v > 0) {
6921                         x--;
6922                         *x = '0' + (v % 10);
6923                         v /= 10;
6924                 }
6925                 /* make up a name */
6926                 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
6927                 yaffs_strcat(locName, x);
6928                 yaffs_strncpy(name, locName, buffSize - 1);
6929
6930         }
6931 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6932         else if (obj->shortName[0])
6933                 yaffs_strcpy(name, obj->shortName);
6934 #endif
6935         else {
6936                 int result;
6937                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6938
6939                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6940
6941                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6942
6943                 if (obj->hdrChunk > 0) {
6944                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6945                                                         obj->hdrChunk, buffer,
6946                                                         NULL);
6947                 }
6948                 yaffs_strncpy(name, oh->name, buffSize - 1);
6949
6950                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6951         }
6952
6953         return yaffs_strlen(name);
6954 }
6955
6956 int yaffs_GetObjectFileLength(yaffs_Object *obj)
6957 {
6958         /* Dereference any hard linking */
6959         obj = yaffs_GetEquivalentObject(obj);
6960
6961         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
6962                 return obj->variant.fileVariant.fileSize;
6963         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
6964                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6965         else {
6966                 /* Only a directory should drop through to here */
6967                 return obj->myDev->nDataBytesPerChunk;
6968         }
6969 }
6970
6971 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
6972 {
6973         int count = 0;
6974         struct ylist_head *i;
6975
6976         if (!obj->unlinked)
6977                 count++;                /* the object itself */
6978
6979         ylist_for_each(i, &obj->hardLinks)
6980                 count++;                /* add the hard links; */
6981
6982         return count;
6983 }
6984
6985 int yaffs_GetObjectInode(yaffs_Object *obj)
6986 {
6987         obj = yaffs_GetEquivalentObject(obj);
6988
6989         return obj->objectId;
6990 }
6991
6992 unsigned yaffs_GetObjectType(yaffs_Object *obj)
6993 {
6994         obj = yaffs_GetEquivalentObject(obj);
6995
6996         switch (obj->variantType) {
6997         case YAFFS_OBJECT_TYPE_FILE:
6998                 return DT_REG;
6999                 break;
7000         case YAFFS_OBJECT_TYPE_DIRECTORY:
7001                 return DT_DIR;
7002                 break;
7003         case YAFFS_OBJECT_TYPE_SYMLINK:
7004                 return DT_LNK;
7005                 break;
7006         case YAFFS_OBJECT_TYPE_HARDLINK:
7007                 return DT_REG;
7008                 break;
7009         case YAFFS_OBJECT_TYPE_SPECIAL:
7010                 if (S_ISFIFO(obj->yst_mode))
7011                         return DT_FIFO;
7012                 if (S_ISCHR(obj->yst_mode))
7013                         return DT_CHR;
7014                 if (S_ISBLK(obj->yst_mode))
7015                         return DT_BLK;
7016                 if (S_ISSOCK(obj->yst_mode))
7017                         return DT_SOCK;
7018         default:
7019                 return DT_REG;
7020                 break;
7021         }
7022 }
7023
7024 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7025 {
7026         obj = yaffs_GetEquivalentObject(obj);
7027         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7028                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7029         else
7030                 return yaffs_CloneString(_Y(""));
7031 }
7032
7033 #ifndef CONFIG_YAFFS_WINCE
7034
7035 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7036 {
7037         unsigned int valid = attr->ia_valid;
7038
7039         if (valid & ATTR_MODE)
7040                 obj->yst_mode = attr->ia_mode;
7041         if (valid & ATTR_UID)
7042                 obj->yst_uid = attr->ia_uid;
7043         if (valid & ATTR_GID)
7044                 obj->yst_gid = attr->ia_gid;
7045
7046         if (valid & ATTR_ATIME)
7047                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7048         if (valid & ATTR_CTIME)
7049                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7050         if (valid & ATTR_MTIME)
7051                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7052
7053         if (valid & ATTR_SIZE)
7054                 yaffs_ResizeFile(obj, attr->ia_size);
7055
7056         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7057
7058         return YAFFS_OK;
7059
7060 }
7061 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7062 {
7063         unsigned int valid = 0;
7064
7065         attr->ia_mode = obj->yst_mode;
7066         valid |= ATTR_MODE;
7067         attr->ia_uid = obj->yst_uid;
7068         valid |= ATTR_UID;
7069         attr->ia_gid = obj->yst_gid;
7070         valid |= ATTR_GID;
7071
7072         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7073         valid |= ATTR_ATIME;
7074         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7075         valid |= ATTR_CTIME;
7076         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7077         valid |= ATTR_MTIME;
7078
7079         attr->ia_size = yaffs_GetFileSize(obj);
7080         valid |= ATTR_SIZE;
7081
7082         attr->ia_valid = valid;
7083
7084         return YAFFS_OK;
7085 }
7086
7087 #endif
7088
7089 #if 0
7090 int yaffs_DumpObject(yaffs_Object *obj)
7091 {
7092         YCHAR name[257];
7093
7094         yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7095
7096         T(YAFFS_TRACE_ALWAYS,
7097           (TSTR
7098            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7099             " chunk %d type %d size %d\n"
7100             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7101            obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7102            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7103
7104         return YAFFS_OK;
7105 }
7106 #endif
7107
7108 /*---------------------------- Initialisation code -------------------------------------- */
7109
7110 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7111 {
7112
7113         /* Common functions, gotta have */
7114         if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
7115                 return 0;
7116
7117 #ifdef CONFIG_YAFFS_YAFFS2
7118
7119         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7120         if (dev->writeChunkWithTagsToNAND &&
7121             dev->readChunkWithTagsFromNAND &&
7122             !dev->writeChunkToNAND &&
7123             !dev->readChunkFromNAND &&
7124             dev->markNANDBlockBad && dev->queryNANDBlock)
7125                 return 1;
7126 #endif
7127
7128         /* Can use the "spare" style interface for yaffs1 */
7129         if (!dev->isYaffs2 &&
7130             !dev->writeChunkWithTagsToNAND &&
7131             !dev->readChunkWithTagsFromNAND &&
7132             dev->writeChunkToNAND &&
7133             dev->readChunkFromNAND &&
7134             !dev->markNANDBlockBad && !dev->queryNANDBlock)
7135                 return 1;
7136
7137         return 0;               /* bad */
7138 }
7139
7140
7141 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7142 {
7143         /* Initialise the unlinked, deleted, root and lost and found directories */
7144
7145         dev->lostNFoundDir = dev->rootDir =  NULL;
7146         dev->unlinkedDir = dev->deletedDir = NULL;
7147
7148         dev->unlinkedDir =
7149             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7150
7151         dev->deletedDir =
7152             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7153
7154         dev->rootDir =
7155             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7156                                       YAFFS_ROOT_MODE | S_IFDIR);
7157         dev->lostNFoundDir =
7158             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7159                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7160
7161         if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7162                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7163                 return YAFFS_OK;
7164         }
7165
7166         return YAFFS_FAIL;
7167 }
7168
7169 int yaffs_GutsInitialise(yaffs_Device *dev)
7170 {
7171         int init_failed = 0;
7172         unsigned x;
7173         int bits;
7174
7175         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7176
7177         /* Check stuff that must be set */
7178
7179         if (!dev) {
7180                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7181                 return YAFFS_FAIL;
7182         }
7183
7184         dev->internalStartBlock = dev->startBlock;
7185         dev->internalEndBlock = dev->endBlock;
7186         dev->blockOffset = 0;
7187         dev->chunkOffset = 0;
7188         dev->nFreeChunks = 0;
7189
7190         dev->gcBlock = -1;
7191
7192         if (dev->startBlock == 0) {
7193                 dev->internalStartBlock = dev->startBlock + 1;
7194                 dev->internalEndBlock = dev->endBlock + 1;
7195                 dev->blockOffset = 1;
7196                 dev->chunkOffset = dev->nChunksPerBlock;
7197         }
7198
7199         /* Check geometry parameters. */
7200
7201         if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
7202             (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
7203             (dev->inbandTags && !dev->isYaffs2) ||
7204              dev->nChunksPerBlock < 2 ||
7205              dev->nReservedBlocks < 2 ||
7206              dev->internalStartBlock <= 0 ||
7207              dev->internalEndBlock <= 0 ||
7208              dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) {   /* otherwise it is too small */
7209                 T(YAFFS_TRACE_ALWAYS,
7210                   (TSTR
7211                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7212                     TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
7213                 return YAFFS_FAIL;
7214         }
7215
7216         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7217                 T(YAFFS_TRACE_ALWAYS,
7218                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7219                 return YAFFS_FAIL;
7220         }
7221
7222         /* Sort out space for inband tags, if required */
7223         if (dev->inbandTags)
7224                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7225         else
7226                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
7227
7228         /* Got the right mix of functions? */
7229         if (!yaffs_CheckDevFunctions(dev)) {
7230                 /* Function missing */
7231                 T(YAFFS_TRACE_ALWAYS,
7232                   (TSTR
7233                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7234
7235                 return YAFFS_FAIL;
7236         }
7237
7238         /* This is really a compilation check. */
7239         if (!yaffs_CheckStructures()) {
7240                 T(YAFFS_TRACE_ALWAYS,
7241                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7242                 return YAFFS_FAIL;
7243         }
7244
7245         if (dev->isMounted) {
7246                 T(YAFFS_TRACE_ALWAYS,
7247                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
7248                 return YAFFS_FAIL;
7249         }
7250
7251         /* Finished with most checks. One or two more checks happen later on too. */
7252
7253         dev->isMounted = 1;
7254
7255         /* OK now calculate a few things for the device */
7256
7257         /*
7258          *  Calculate all the chunk size manipulation numbers:
7259          */
7260         x = dev->nDataBytesPerChunk;
7261         /* We always use dev->chunkShift and dev->chunkDiv */
7262         dev->chunkShift = Shifts(x);
7263         x >>= dev->chunkShift;
7264         dev->chunkDiv = x;
7265         /* We only use chunk mask if chunkDiv is 1 */
7266         dev->chunkMask = (1<<dev->chunkShift) - 1;
7267
7268         /*
7269          * Calculate chunkGroupBits.
7270          * We need to find the next power of 2 > than internalEndBlock
7271          */
7272
7273         x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7274
7275         bits = ShiftsGE(x);
7276
7277         /* Set up tnode width if wide tnodes are enabled. */
7278         if (!dev->wideTnodesDisabled) {
7279                 /* bits must be even so that we end up with 32-bit words */
7280                 if (bits & 1)
7281                         bits++;
7282                 if (bits < 16)
7283                         dev->tnodeWidth = 16;
7284                 else
7285                         dev->tnodeWidth = bits;
7286         } else
7287                 dev->tnodeWidth = 16;
7288
7289         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7290
7291         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7292          * so if the bitwidth of the
7293          * chunk range we're using is greater than 16 we need
7294          * to figure out chunk shift and chunkGroupSize
7295          */
7296
7297         if (bits <= dev->tnodeWidth)
7298                 dev->chunkGroupBits = 0;
7299         else
7300                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7301
7302
7303         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7304
7305         if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7306                 /* We have a problem because the soft delete won't work if
7307                  * the chunk group size > chunks per block.
7308                  * This can be remedied by using larger "virtual blocks".
7309                  */
7310                 T(YAFFS_TRACE_ALWAYS,
7311                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7312
7313                 return YAFFS_FAIL;
7314         }
7315
7316         /* OK, we've finished verifying the device, lets continue with initialisation */
7317
7318         /* More device initialisation */
7319         dev->garbageCollections = 0;
7320         dev->passiveGarbageCollections = 0;
7321         dev->currentDirtyChecker = 0;
7322         dev->bufferedBlock = -1;
7323         dev->doingBufferedBlockRewrite = 0;
7324         dev->nDeletedFiles = 0;
7325         dev->nBackgroundDeletions = 0;
7326         dev->nUnlinkedFiles = 0;
7327         dev->eccFixed = 0;
7328         dev->eccUnfixed = 0;
7329         dev->tagsEccFixed = 0;
7330         dev->tagsEccUnfixed = 0;
7331         dev->nErasureFailures = 0;
7332         dev->nErasedBlocks = 0;
7333         dev->isDoingGC = 0;
7334         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7335
7336         /* Initialise temporary buffers and caches. */
7337         if (!yaffs_InitialiseTempBuffers(dev))
7338                 init_failed = 1;
7339
7340         dev->srCache = NULL;
7341         dev->gcCleanupList = NULL;
7342
7343
7344         if (!init_failed &&
7345             dev->nShortOpCaches > 0) {
7346                 int i;
7347                 void *buf;
7348                 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7349
7350                 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7351                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7352
7353                 dev->srCache =  YMALLOC(srCacheBytes);
7354
7355                 buf = (__u8 *) dev->srCache;
7356
7357                 if (dev->srCache)
7358                         memset(dev->srCache, 0, srCacheBytes);
7359
7360                 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7361                         dev->srCache[i].object = NULL;
7362                         dev->srCache[i].lastUse = 0;
7363                         dev->srCache[i].dirty = 0;
7364                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
7365                 }
7366                 if (!buf)
7367                         init_failed = 1;
7368
7369                 dev->srLastUse = 0;
7370         }
7371
7372         dev->cacheHits = 0;
7373
7374         if (!init_failed) {
7375                 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7376                 if (!dev->gcCleanupList)
7377                         init_failed = 1;
7378         }
7379
7380         if (dev->isYaffs2)
7381                 dev->useHeaderFileSize = 1;
7382
7383         if (!init_failed && !yaffs_InitialiseBlocks(dev))
7384                 init_failed = 1;
7385
7386         yaffs_InitialiseTnodes(dev);
7387         yaffs_InitialiseObjects(dev);
7388
7389         if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7390                 init_failed = 1;
7391
7392
7393         if (!init_failed) {
7394                 /* Now scan the flash. */
7395                 if (dev->isYaffs2) {
7396                         if (yaffs_CheckpointRestore(dev)) {
7397                                 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7398                                 T(YAFFS_TRACE_ALWAYS,
7399                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7400                         } else {
7401
7402                                 /* Clean up the mess caused by an aborted checkpoint load
7403                                  * and scan backwards.
7404                                  */
7405                                 yaffs_DeinitialiseBlocks(dev);
7406                                 yaffs_DeinitialiseTnodes(dev);
7407                                 yaffs_DeinitialiseObjects(dev);
7408
7409
7410                                 dev->nErasedBlocks = 0;
7411                                 dev->nFreeChunks = 0;
7412                                 dev->allocationBlock = -1;
7413                                 dev->allocationPage = -1;
7414                                 dev->nDeletedFiles = 0;
7415                                 dev->nUnlinkedFiles = 0;
7416                                 dev->nBackgroundDeletions = 0;
7417                                 dev->oldestDirtySequence = 0;
7418
7419                                 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7420                                         init_failed = 1;
7421
7422                                 yaffs_InitialiseTnodes(dev);
7423                                 yaffs_InitialiseObjects(dev);
7424
7425                                 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7426                                         init_failed = 1;
7427
7428                                 if (!init_failed && !yaffs_ScanBackwards(dev))
7429                                         init_failed = 1;
7430                         }
7431                 } else if (!yaffs_Scan(dev))
7432                                 init_failed = 1;
7433
7434                 yaffs_StripDeletedObjects(dev);
7435         }
7436
7437         if (init_failed) {
7438                 /* Clean up the mess */
7439                 T(YAFFS_TRACE_TRACING,
7440                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7441
7442                 yaffs_Deinitialise(dev);
7443                 return YAFFS_FAIL;
7444         }
7445
7446         /* Zero out stats */
7447         dev->nPageReads = 0;
7448         dev->nPageWrites = 0;
7449         dev->nBlockErasures = 0;
7450         dev->nGCCopies = 0;
7451         dev->nRetriedWrites = 0;
7452
7453         dev->nRetiredBlocks = 0;
7454
7455         yaffs_VerifyFreeChunks(dev);
7456         yaffs_VerifyBlocks(dev);
7457
7458
7459         T(YAFFS_TRACE_TRACING,
7460           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7461         return YAFFS_OK;
7462
7463 }
7464
7465 void yaffs_Deinitialise(yaffs_Device *dev)
7466 {
7467         if (dev->isMounted) {
7468                 int i;
7469
7470                 yaffs_DeinitialiseBlocks(dev);
7471                 yaffs_DeinitialiseTnodes(dev);
7472                 yaffs_DeinitialiseObjects(dev);
7473                 if (dev->nShortOpCaches > 0 &&
7474                     dev->srCache) {
7475
7476                         for (i = 0; i < dev->nShortOpCaches; i++) {
7477                                 if (dev->srCache[i].data)
7478                                         YFREE(dev->srCache[i].data);
7479                                 dev->srCache[i].data = NULL;
7480                         }
7481
7482                         YFREE(dev->srCache);
7483                         dev->srCache = NULL;
7484                 }
7485
7486                 YFREE(dev->gcCleanupList);
7487
7488                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7489                         YFREE(dev->tempBuffer[i].buffer);
7490
7491                 dev->isMounted = 0;
7492
7493                 if (dev->deinitialiseNAND)
7494                         dev->deinitialiseNAND(dev);
7495         }
7496 }
7497
7498 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7499 {
7500         int nFree;
7501         int b;
7502
7503         yaffs_BlockInfo *blk;
7504
7505         for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7506                         b++) {
7507                 blk = yaffs_GetBlockInfo(dev, b);
7508
7509                 switch (blk->blockState) {
7510                 case YAFFS_BLOCK_STATE_EMPTY:
7511                 case YAFFS_BLOCK_STATE_ALLOCATING:
7512                 case YAFFS_BLOCK_STATE_COLLECTING:
7513                 case YAFFS_BLOCK_STATE_FULL:
7514                         nFree +=
7515                             (dev->nChunksPerBlock - blk->pagesInUse +
7516                              blk->softDeletions);
7517                         break;
7518                 default:
7519                         break;
7520                 }
7521         }
7522
7523         return nFree;
7524 }
7525
7526 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7527 {
7528         /* This is what we report to the outside world */
7529
7530         int nFree;
7531         int nDirtyCacheChunks;
7532         int blocksForCheckpoint;
7533         int i;
7534
7535 #if 1
7536         nFree = dev->nFreeChunks;
7537 #else
7538         nFree = yaffs_CountFreeChunks(dev);
7539 #endif
7540
7541         nFree += dev->nDeletedFiles;
7542
7543         /* Now count the number of dirty chunks in the cache and subtract those */
7544
7545         for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7546                 if (dev->srCache[i].dirty)
7547                         nDirtyCacheChunks++;
7548         }
7549
7550         nFree -= nDirtyCacheChunks;
7551
7552         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7553
7554         /* Now we figure out how much to reserve for the checkpoint and report that... */
7555         blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7556         if (blocksForCheckpoint < 0)
7557                 blocksForCheckpoint = 0;
7558
7559         nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7560
7561         if (nFree < 0)
7562                 nFree = 0;
7563
7564         return nFree;
7565
7566 }
7567
7568 static int yaffs_freeVerificationFailures;
7569
7570 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7571 {
7572         int counted;
7573         int difference;
7574
7575         if (yaffs_SkipVerification(dev))
7576                 return;
7577
7578         counted = yaffs_CountFreeChunks(dev);
7579
7580         difference = dev->nFreeChunks - counted;
7581
7582         if (difference) {
7583                 T(YAFFS_TRACE_ALWAYS,
7584                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7585                    dev->nFreeChunks, counted, difference));
7586                 yaffs_freeVerificationFailures++;
7587         }
7588 }
7589
7590 /*---------------------------------------- YAFFS test code ----------------------*/
7591
7592 #define yaffs_CheckStruct(structure, syze, name) \
7593         do { \
7594                 if (sizeof(structure) != syze) { \
7595                         T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7596                                 name, syze, sizeof(structure))); \
7597                         return YAFFS_FAIL; \
7598                 } \
7599         } while (0)
7600
7601 static int yaffs_CheckStructures(void)
7602 {
7603 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7604 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7605 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7606 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7607         yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode");
7608 #endif
7609 #ifndef CONFIG_YAFFS_WINCE
7610         yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
7611 #endif
7612         return YAFFS_OK;
7613 }