fs/yaffs2/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 /* XXX U-BOOT XXX */
  15 #include <common.h>
  16
  17 const char *yaffs_guts_c_version =
  18     "$Id: yaffs_guts.c,v 1.52 2007/10/16 00:45:05 charles Exp $";
  19
  20 #include "yportenv.h"
  21 #include "linux/stat.h"
  22
  23 #include "yaffsinterface.h"
  24 #include "yaffsfs.h"
  25 #include "yaffs_guts.h"
  26 #include "yaffs_tagsvalidity.h"
  27
  28 #include "yaffs_tagscompat.h"
  29 #ifndef  CONFIG_YAFFS_USE_OWN_SORT
  30 #include "yaffs_qsort.h"
  31 #endif
  32 #include "yaffs_nand.h"
  33
  34 #include "yaffs_checkptrw.h"
  35
  36 #include "yaffs_nand.h"
  37 #include "yaffs_packedtags2.h"
  38
  39 #include "malloc.h"
  40
  41 #ifdef CONFIG_YAFFS_WINCE
  42 void yfsd_LockYAFFS(BOOL fsLockOnly);
  43 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
  44 #endif
  45
  46 #define YAFFS_PASSIVE_GC_CHUNKS 2
  47
  48 #include "yaffs_ecc.h"
  49
  50
  51 /* Robustification (if it ever comes about...) */
  52 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
  53 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
  54 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
  55                                      const __u8 * data,
  56                                      const yaffs_ExtendedTags * tags);
  57 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
  58                                     const yaffs_ExtendedTags * tags);
  59
  60 /* Other local prototypes */
  61 static int yaffs_UnlinkObject( yaffs_Object *obj);
  62 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
  63
  64 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
  65
  66 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
  67                                              const __u8 * buffer,
  68                                              yaffs_ExtendedTags * tags,
  69                                              int useReserve);
  70 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
  71                                   int chunkInNAND, int inScan);
  72
  73 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
  74                                            yaffs_ObjectType type);
  75 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
  76                                        yaffs_Object * obj);
  77 static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
  78                                     int force, int isShrink, int shadows);
  79 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
  80 static int yaffs_CheckStructures(void);
  81 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
  82
  83 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
  84
  85 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
  86 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
  87                                     int lineNo);
  88
  89 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
  90                                   int chunkInNAND);
  91
  92 static int yaffs_UnlinkWorker(yaffs_Object * obj);
  93 static void yaffs_DestroyObject(yaffs_Object * obj);
  94
  95 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
  96                            int chunkInObject);
  97
  98 loff_t yaffs_GetFileSize(yaffs_Object * obj);
  99
 100 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
 101
 102 static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
 103
 104 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
 105
 106 #ifdef YAFFS_PARANOID
 107 static int yaffs_CheckFileSanity(yaffs_Object * in);
 108 #else
 109 #define yaffs_CheckFileSanity(in)
 110 #endif
 111
 112 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
 113 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
 114
 115 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
 116
 117 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
 118                                  yaffs_ExtendedTags * tags);
 119
 120 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
 121 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
 122                                           yaffs_FileStructure * fStruct,
 123                                           __u32 chunkId);
 124
 125
 126 /* Function to calculate chunk and offset */
 127
 128 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
 129 {
 130         if(dev->chunkShift){
 131                 /* Easy-peasy power of 2 case */
 132                 *chunk  = (__u32)(addr >> dev->chunkShift);
 133                 *offset = (__u32)(addr & dev->chunkMask);
 134         }
 135         else if(dev->crumbsPerChunk)
 136         {
 137                 /* Case where we're using "crumbs" */
 138                 *offset = (__u32)(addr & dev->crumbMask);
 139                 addr >>= dev->crumbShift;
 140                 *chunk = ((__u32)addr)/dev->crumbsPerChunk;
 141                 *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
 142         }
 143         else
 144                 YBUG();
 145 }
 146
 147 /* Function to return the number of shifts for a power of 2 greater than or equal
 148  * to the given number
 149  * Note we don't try to cater for all possible numbers and this does not have to
 150  * be hellishly efficient.
 151  */
 152
 153 static __u32 ShiftsGE(__u32 x)
 154 {
 155         int extraBits;
 156         int nShifts;
 157
 158         nShifts = extraBits = 0;
 159
 160         while(x>1){
 161                 if(x & 1) extraBits++;
 162                 x>>=1;
 163                 nShifts++;
 164         }
 165
 166         if(extraBits)
 167                 nShifts++;
 168
 169         return nShifts;
 170 }
 171
 172 /* Function to return the number of shifts to get a 1 in bit 0
 173  */
 174
 175 static __u32 ShiftDiv(__u32 x)
 176 {
 177         int nShifts;
 178
 179         nShifts =  0;
 180
 181         if(!x) 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->nDataBytesPerChunk);
 208         }
 209
 210         return buf ? YAFFS_OK : YAFFS_FAIL;
 211
 212 }
 213
 214 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
 215 {
 216         int i, j;
 217         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 218                 if (dev->tempBuffer[i].line == 0) {
 219                         dev->tempBuffer[i].line = lineNo;
 220                         if ((i + 1) > dev->maxTemp) {
 221                                 dev->maxTemp = i + 1;
 222                                 for (j = 0; j <= i; j++)
 223                                         dev->tempBuffer[j].maxLine =
 224                                             dev->tempBuffer[j].line;
 225                         }
 226
 227                         return dev->tempBuffer[i].buffer;
 228                 }
 229         }
 230
 231         T(YAFFS_TRACE_BUFFERS,
 232           (TSTR("Out of temp buffers at line %d, other held by lines:"),
 233            lineNo));
 234         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 235                 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
 236         }
 237         T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 238
 239         /*
 240          * If we got here then we have to allocate an unmanaged one
 241          * This is not good.
 242          */
 243
 244         dev->unmanagedTempAllocations++;
 245         return YMALLOC(dev->nDataBytesPerChunk);
 246
 247 }
 248
 249 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
 250                                     int lineNo)
 251 {
 252         int i;
 253         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 254                 if (dev->tempBuffer[i].buffer == buffer) {
 255                         dev->tempBuffer[i].line = 0;
 256                         return;
 257                 }
 258         }
 259
 260         if (buffer) {
 261                 /* assume it is an unmanaged one. */
 262                 T(YAFFS_TRACE_BUFFERS,
 263                   (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
 264                    lineNo));
 265                 YFREE(buffer);
 266                 dev->unmanagedTempDeallocations++;
 267         }
 268
 269 }
 270
 271 /*
 272  * Determine if we have a managed buffer.
 273  */
 274 int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
 275 {
 276         int i;
 277         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 278                 if (dev->tempBuffer[i].buffer == buffer)
 279                         return 1;
 280
 281         }
 282
 283     for (i = 0; i < dev->nShortOpCaches; i++) {
 284         if( dev->srCache[i].data == buffer )
 285             return 1;
 286
 287     }
 288
 289     if (buffer == dev->checkpointBuffer)
 290       return 1;
 291
 292     T(YAFFS_TRACE_ALWAYS,
 293           (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
 294     return 0;
 295 }
 296
 297
 298
 299 /*
 300  * Chunk bitmap manipulations
 301  */
 302
 303 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
 304 {
 305         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
 306                 T(YAFFS_TRACE_ERROR,
 307                   (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
 308                    blk));
 309                 YBUG();
 310         }
 311         return dev->chunkBits +
 312             (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 313 }
 314
 315 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
 316 {
 317         if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
 318            chunk < 0 || chunk >= dev->nChunksPerBlock) {
 319            T(YAFFS_TRACE_ERROR,
 320             (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
 321             YBUG();
 322         }
 323 }
 324
 325 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
 326 {
 327         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 328
 329         memset(blkBits, 0, dev->chunkBitmapStride);
 330 }
 331
 332 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
 333 {
 334         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 335
 336         yaffs_VerifyChunkBitId(dev,blk,chunk);
 337
 338         blkBits[chunk / 8] &= ~(1 << (chunk & 7));
 339 }
 340
 341 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
 342 {
 343         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 344
 345         yaffs_VerifyChunkBitId(dev,blk,chunk);
 346
 347         blkBits[chunk / 8] |= (1 << (chunk & 7));
 348 }
 349
 350 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
 351 {
 352         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 353         yaffs_VerifyChunkBitId(dev,blk,chunk);
 354
 355         return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
 356 }
 357
 358 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
 359 {
 360         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 361         int i;
 362         for (i = 0; i < dev->chunkBitmapStride; i++) {
 363                 if (*blkBits)
 364                         return 1;
 365                 blkBits++;
 366         }
 367         return 0;
 368 }
 369
 370 static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
 371 {
 372         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 373         int i;
 374         int n = 0;
 375         for (i = 0; i < dev->chunkBitmapStride; i++) {
 376                 __u8 x = *blkBits;
 377                 while(x){
 378                         if(x & 1)
 379                                 n++;
 380                         x >>=1;
 381                 }
 382
 383                 blkBits++;
 384         }
 385         return n;
 386 }
 387
 388 /*
 389  * Verification code
 390  */
 391
 392 static Y_INLINE int yaffs_SkipVerification(yaffs_Device *dev)
 393 {
 394         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
 395 }
 396
 397 static Y_INLINE int yaffs_SkipFullVerification(yaffs_Device *dev)
 398 {
 399         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
 400 }
 401
 402 static Y_INLINE int yaffs_SkipNANDVerification(yaffs_Device *dev)
 403 {
 404         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
 405 }
 406
 407 static const char * blockStateName[] = {
 408 "Unknown",
 409 "Needs scanning",
 410 "Scanning",
 411 "Empty",
 412 "Allocating",
 413 "Full",
 414 "Dirty",
 415 "Checkpoint",
 416 "Collecting",
 417 "Dead"
 418 };
 419
 420 static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
 421 {
 422         int actuallyUsed;
 423         int inUse;
 424
 425         if(yaffs_SkipVerification(dev))
 426                 return;
 427
 428         /* Report illegal runtime states */
 429         if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
 430                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
 431
 432         switch(bi->blockState){
 433          case YAFFS_BLOCK_STATE_UNKNOWN:
 434          case YAFFS_BLOCK_STATE_SCANNING:
 435          case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
 436                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
 437                 n,blockStateName[bi->blockState]));
 438         }
 439
 440         /* Check pages in use and soft deletions are legal */
 441
 442         actuallyUsed = bi->pagesInUse - bi->softDeletions;
 443
 444         if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
 445            bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
 446            actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
 447                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
 448                 n,bi->pagesInUse,bi->softDeletions));
 449
 450
 451         /* Check chunk bitmap legal */
 452         inUse = yaffs_CountChunkBits(dev,n);
 453         if(inUse != bi->pagesInUse)
 454                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
 455                         n,bi->pagesInUse,inUse));
 456
 457         /* Check that the sequence number is valid.
 458          * Ten million is legal, but is very unlikely
 459          */
 460         if(dev->isYaffs2 &&
 461            (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
 462            (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
 463                 T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
 464                 n,bi->sequenceNumber));
 465
 466 }
 467
 468 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
 469 {
 470         yaffs_VerifyBlock(dev,bi,n);
 471
 472         /* After collection the block should be in the erased state */
 473         /* TODO: This will need to change if we do partial gc */
 474
 475         if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
 476                 T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
 477                         n,bi->blockState));
 478         }
 479 }
 480
 481 static void yaffs_VerifyBlocks(yaffs_Device *dev)
 482 {
 483         int i;
 484         int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
 485         int nIllegalBlockStates = 0;
 486
 487
 488         if(yaffs_SkipVerification(dev))
 489                 return;
 490
 491         memset(nBlocksPerState,0,sizeof(nBlocksPerState));
 492
 493
 494         for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
 495                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
 496                 yaffs_VerifyBlock(dev,bi,i);
 497
 498                 if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
 499                         nBlocksPerState[bi->blockState]++;
 500                 else
 501                         nIllegalBlockStates++;
 502
 503         }
 504
 505         T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
 506         T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
 507
 508         T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
 509         if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
 510                 T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
 511
 512         for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
 513                 T(YAFFS_TRACE_VERIFY,
 514                   (TSTR("%s %d blocks"TENDSTR),
 515                   blockStateName[i],nBlocksPerState[i]));
 516
 517         if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
 518                 T(YAFFS_TRACE_VERIFY,
 519                  (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
 520                  dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
 521
 522         if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
 523                 T(YAFFS_TRACE_VERIFY,
 524                  (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
 525                  dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
 526
 527         if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
 528                 T(YAFFS_TRACE_VERIFY,
 529                  (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
 530                  nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
 531
 532         T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
 533
 534 }
 535
 536 /*
 537  * Verify the object header. oh must be valid, but obj and tags may be NULL in which
 538  * case those tests will not be performed.
 539  */
 540 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
 541 {
 542         if(yaffs_SkipVerification(obj->myDev))
 543                 return;
 544
 545         if(!(tags && obj && oh)){
 546                 T(YAFFS_TRACE_VERIFY,
 547                                 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
 548                                 (__u32)tags,(__u32)obj,(__u32)oh));
 549                 return;
 550         }
 551
 552         if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
 553            oh->type > YAFFS_OBJECT_TYPE_MAX)
 554                 T(YAFFS_TRACE_VERIFY,
 555                  (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
 556                  tags->objectId, oh->type));
 557
 558         if(tags->objectId != obj->objectId)
 559                 T(YAFFS_TRACE_VERIFY,
 560                  (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
 561                  tags->objectId, obj->objectId));
 562
 563
 564         /*
 565          * Check that the object's parent ids match if parentCheck requested.
 566          *
 567          * Tests do not apply to the root object.
 568          */
 569
 570         if(parentCheck && tags->objectId > 1 && !obj->parent)
 571                 T(YAFFS_TRACE_VERIFY,
 572                  (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
 573                  tags->objectId, oh->parentObjectId));
 574
 575
 576         if(parentCheck && obj->parent &&
 577            oh->parentObjectId != obj->parent->objectId &&
 578            (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
 579             obj->parent->objectId != YAFFS_OBJECTID_DELETED))
 580                 T(YAFFS_TRACE_VERIFY,
 581                  (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
 582                  tags->objectId, oh->parentObjectId, obj->parent->objectId));
 583
 584
 585         if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
 586                 T(YAFFS_TRACE_VERIFY,
 587                 (TSTR("Obj %d header name is NULL"TENDSTR),
 588                  obj->objectId));
 589
 590         if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
 591                 T(YAFFS_TRACE_VERIFY,
 592                 (TSTR("Obj %d header name is 0xFF"TENDSTR),
 593                  obj->objectId));
 594 }
 595
 596 static void yaffs_VerifyFile(yaffs_Object *obj)
 597 {
 598         int requiredTallness;
 599         int actualTallness;
 600         __u32 lastChunk;
 601         __u32 x;
 602         __u32 i;
 603         yaffs_Device *dev;
 604         yaffs_ExtendedTags tags;
 605         yaffs_Tnode *tn;
 606         __u32 objectId;
 607
 608         if(obj && yaffs_SkipVerification(obj->myDev))
 609                 return;
 610
 611         dev = obj->myDev;
 612         objectId = obj->objectId;
 613
 614         /* Check file size is consistent with tnode depth */
 615         lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
 616         x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
 617         requiredTallness = 0;
 618         while (x> 0) {
 619                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 620                 requiredTallness++;
 621         }
 622
 623         actualTallness = obj->variant.fileVariant.topLevel;
 624
 625         if(requiredTallness > actualTallness )
 626                 T(YAFFS_TRACE_VERIFY,
 627                 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
 628                  obj->objectId,actualTallness, requiredTallness));
 629
 630
 631         /* Check that the chunks in the tnode tree are all correct.
 632          * We do this by scanning through the tnode tree and
 633          * checking the tags for every chunk match.
 634          */
 635
 636         if(yaffs_SkipNANDVerification(dev))
 637                 return;
 638
 639         for(i = 1; i <= lastChunk; i++){
 640                 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
 641
 642                 if (tn) {
 643                         __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
 644                         if(theChunk > 0){
 645                                 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
 646                                 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
 647                                 if(tags.objectId != objectId || tags.chunkId != i){
 648                                         T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 649                                                 objectId, i, theChunk,
 650                                                 tags.objectId, tags.chunkId));
 651                                 }
 652                         }
 653                 }
 654
 655         }
 656
 657 }
 658
 659 static void yaffs_VerifyDirectory(yaffs_Object *obj)
 660 {
 661         if(obj && yaffs_SkipVerification(obj->myDev))
 662                 return;
 663
 664 }
 665
 666 static void yaffs_VerifyHardLink(yaffs_Object *obj)
 667 {
 668         if(obj && yaffs_SkipVerification(obj->myDev))
 669                 return;
 670
 671         /* Verify sane equivalent object */
 672 }
 673
 674 static void yaffs_VerifySymlink(yaffs_Object *obj)
 675 {
 676         if(obj && yaffs_SkipVerification(obj->myDev))
 677                 return;
 678
 679         /* Verify symlink string */
 680 }
 681
 682 static void yaffs_VerifySpecial(yaffs_Object *obj)
 683 {
 684         if(obj && yaffs_SkipVerification(obj->myDev))
 685                 return;
 686 }
 687
 688 static void yaffs_VerifyObject(yaffs_Object *obj)
 689 {
 690         yaffs_Device *dev;
 691
 692         __u32 chunkMin;
 693         __u32 chunkMax;
 694
 695         __u32 chunkIdOk;
 696         __u32 chunkIsLive;
 697
 698         if(!obj)
 699                 return;
 700
 701         dev = obj->myDev;
 702
 703         if(yaffs_SkipVerification(dev))
 704                 return;
 705
 706         /* Check sane object header chunk */
 707
 708         chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
 709         chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
 710
 711         chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
 712         chunkIsLive = chunkIdOk &&
 713                         yaffs_CheckChunkBit(dev,
 714                                             obj->chunkId / dev->nChunksPerBlock,
 715                                             obj->chunkId % dev->nChunksPerBlock);
 716         if(!obj->fake &&
 717             (!chunkIdOk || !chunkIsLive)) {
 718            T(YAFFS_TRACE_VERIFY,
 719            (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
 720            obj->objectId,obj->chunkId,
 721            chunkIdOk ? "" : ",out of range",
 722            chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
 723         }
 724
 725         if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
 726                 yaffs_ExtendedTags tags;
 727                 yaffs_ObjectHeader *oh;
 728                 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
 729
 730                 oh = (yaffs_ObjectHeader *)buffer;
 731
 732                 yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
 733
 734                 yaffs_VerifyObjectHeader(obj,oh,&tags,1);
 735
 736                 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
 737         }
 738
 739         /* Verify it has a parent */
 740         if(obj && !obj->fake &&
 741            (!obj->parent || obj->parent->myDev != dev)){
 742            T(YAFFS_TRACE_VERIFY,
 743            (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
 744            obj->objectId,obj->parent));
 745         }
 746
 747         /* Verify parent is a directory */
 748         if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
 749            T(YAFFS_TRACE_VERIFY,
 750            (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
 751            obj->objectId,obj->parent->variantType));
 752         }
 753
 754         switch(obj->variantType){
 755         case YAFFS_OBJECT_TYPE_FILE:
 756                 yaffs_VerifyFile(obj);
 757                 break;
 758         case YAFFS_OBJECT_TYPE_SYMLINK:
 759                 yaffs_VerifySymlink(obj);
 760                 break;
 761         case YAFFS_OBJECT_TYPE_DIRECTORY:
 762                 yaffs_VerifyDirectory(obj);
 763                 break;
 764         case YAFFS_OBJECT_TYPE_HARDLINK:
 765                 yaffs_VerifyHardLink(obj);
 766                 break;
 767         case YAFFS_OBJECT_TYPE_SPECIAL:
 768                 yaffs_VerifySpecial(obj);
 769                 break;
 770         case YAFFS_OBJECT_TYPE_UNKNOWN:
 771         default:
 772                 T(YAFFS_TRACE_VERIFY,
 773                 (TSTR("Obj %d has illegaltype %d"TENDSTR),
 774                 obj->objectId,obj->variantType));
 775                 break;
 776         }
 777
 778
 779 }
 780
 781 static void yaffs_VerifyObjects(yaffs_Device *dev)
 782 {
 783         yaffs_Object *obj;
 784         int i;
 785         struct list_head *lh;
 786
 787         if(yaffs_SkipVerification(dev))
 788                 return;
 789
 790         /* Iterate through the objects in each hash entry */
 791
 792          for(i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++){
 793                 list_for_each(lh, &dev->objectBucket[i].list) {
 794                         if (lh) {
 795                                 obj = list_entry(lh, yaffs_Object, hashLink);
 796                                 yaffs_VerifyObject(obj);
 797                         }
 798                 }
 799          }
 800
 801 }
 802
 803
 804 /*
 805  *  Simple hash function. Needs to have a reasonable spread
 806  */
 807
 808 static Y_INLINE int yaffs_HashFunction(int n)
 809 {
 810 /* XXX U-BOOT XXX */
 811         /*n = abs(n); */
 812         if (n < 0)
 813                 n = -n;
 814         return (n % YAFFS_NOBJECT_BUCKETS);
 815 }
 816
 817 /*
 818  * Access functions to useful fake objects
 819  */
 820
 821 yaffs_Object *yaffs_Root(yaffs_Device * dev)
 822 {
 823         return dev->rootDir;
 824 }
 825
 826 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
 827 {
 828         return dev->lostNFoundDir;
 829 }
 830
 831
 832 /*
 833  *  Erased NAND checking functions
 834  */
 835
 836 int yaffs_CheckFF(__u8 * buffer, int nBytes)
 837 {
 838         /* Horrible, slow implementation */
 839         while (nBytes--) {
 840                 if (*buffer != 0xFF)
 841                         return 0;
 842                 buffer++;
 843         }
 844         return 1;
 845 }
 846
 847 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 848                                   int chunkInNAND)
 849 {
 850
 851         int retval = YAFFS_OK;
 852         __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
 853         yaffs_ExtendedTags tags;
 854         int result;
 855
 856         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 857
 858         if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
 859                 retval = YAFFS_FAIL;
 860
 861
 862         if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
 863                 T(YAFFS_TRACE_NANDACCESS,
 864                   (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
 865                 retval = YAFFS_FAIL;
 866         }
 867
 868         yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 869
 870         return retval;
 871
 872 }
 873
 874 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 875                                              const __u8 * data,
 876                                              yaffs_ExtendedTags * tags,
 877                                              int useReserve)
 878 {
 879         int attempts = 0;
 880         int writeOk = 0;
 881         int chunk;
 882
 883         yaffs_InvalidateCheckpoint(dev);
 884
 885         do {
 886                 yaffs_BlockInfo *bi = 0;
 887                 int erasedOk = 0;
 888
 889                 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
 890                 if (chunk < 0) {
 891                         /* no space */
 892                         break;
 893                 }
 894
 895                 /* First check this chunk is erased, if it needs
 896                  * checking.  The checking policy (unless forced
 897                  * always on) is as follows:
 898                  *
 899                  * Check the first page we try to write in a block.
 900                  * If the check passes then we don't need to check any
 901                  * more.        If the check fails, we check again...
 902                  * If the block has been erased, we don't need to check.
 903                  *
 904                  * However, if the block has been prioritised for gc,
 905                  * then we think there might be something odd about
 906                  * this block and stop using it.
 907                  *
 908                  * Rationale: We should only ever see chunks that have
 909                  * not been erased if there was a partially written
 910                  * chunk due to power loss.  This checking policy should
 911                  * catch that case with very few checks and thus save a
 912                  * lot of checks that are most likely not needed.
 913                  */
 914                 if (bi->gcPrioritise) {
 915                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
 916                         /* try another chunk */
 917                         continue;
 918                 }
 919
 920                 /* let's give it a try */
 921                 attempts++;
 922
 923 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
 924                 bi->skipErasedCheck = 0;
 925 #endif
 926                 if (!bi->skipErasedCheck) {
 927                         erasedOk = yaffs_CheckChunkErased(dev, chunk);
 928                         if (erasedOk != YAFFS_OK) {
 929                                 T(YAFFS_TRACE_ERROR,
 930                                 (TSTR ("**>> yaffs chunk %d was not erased"
 931                                 TENDSTR), chunk));
 932
 933                                 /* try another chunk */
 934                                 continue;
 935                         }
 936                         bi->skipErasedCheck = 1;
 937                 }
 938
 939                 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
 940                                 data, tags);
 941                 if (writeOk != YAFFS_OK) {
 942                         yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
 943                         /* try another chunk */
 944                         continue;
 945                 }
 946
 947                 /* Copy the data into the robustification buffer */
 948                 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
 949
 950         } while (writeOk != YAFFS_OK &&
 951                 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
 952
 953         if(!writeOk)
 954                 chunk = -1;
 955
 956         if (attempts > 1) {
 957                 T(YAFFS_TRACE_ERROR,
 958                         (TSTR("**>> yaffs write required %d attempts" TENDSTR),
 959                         attempts));
 960
 961                 dev->nRetriedWrites += (attempts - 1);
 962         }
 963
 964         return chunk;
 965 }
 966
 967 /*
 968  * Block retiring for handling a broken block.
 969  */
 970
 971 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
 972 {
 973         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
 974
 975         yaffs_InvalidateCheckpoint(dev);
 976
 977         yaffs_MarkBlockBad(dev, blockInNAND);
 978
 979         bi->blockState = YAFFS_BLOCK_STATE_DEAD;
 980         bi->gcPrioritise = 0;
 981         bi->needsRetiring = 0;
 982
 983         dev->nRetiredBlocks++;
 984 }
 985
 986 /*
 987  * Functions for robustisizing TODO
 988  *
 989  */
 990
 991 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
 992                                      const __u8 * data,
 993                                      const yaffs_ExtendedTags * tags)
 994 {
 995 }
 996
 997 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
 998                                     const yaffs_ExtendedTags * tags)
 999 {
1000 }
1001
1002 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1003 {
1004         if(!bi->gcPrioritise){
1005                 bi->gcPrioritise = 1;
1006                 dev->hasPendingPrioritisedGCs = 1;
1007                 bi->chunkErrorStrikes ++;
1008
1009                 if(bi->chunkErrorStrikes > 3){
1010                         bi->needsRetiring = 1; /* Too many stikes, so retire this */
1011                         T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1012
1013                 }
1014
1015         }
1016 }
1017
1018 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
1019 {
1020
1021         int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1022         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1023
1024         yaffs_HandleChunkError(dev,bi);
1025
1026
1027         if(erasedOk ) {
1028                 /* Was an actual write failure, so mark the block for retirement  */
1029                 bi->needsRetiring = 1;
1030                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1031                   (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1032
1033
1034         }
1035
1036         /* Delete the chunk */
1037         yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1038 }
1039
1040
1041 /*---------------- Name handling functions ------------*/
1042
1043 static __u16 yaffs_CalcNameSum(const YCHAR * name)
1044 {
1045         __u16 sum = 0;
1046         __u16 i = 1;
1047
1048         YUCHAR *bname = (YUCHAR *) name;
1049         if (bname) {
1050                 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1051
1052 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1053                         sum += yaffs_toupper(*bname) * i;
1054 #else
1055                         sum += (*bname) * i;
1056 #endif
1057                         i++;
1058                         bname++;
1059                 }
1060         }
1061         return sum;
1062 }
1063
1064 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
1065 {
1066 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1067         if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
1068                 yaffs_strcpy(obj->shortName, name);
1069         } else {
1070                 obj->shortName[0] = _Y('\0');
1071         }
1072 #endif
1073         obj->sum = yaffs_CalcNameSum(name);
1074 }
1075
1076 /*-------------------- TNODES -------------------
1077
1078  * List of spare tnodes
1079  * The list is hooked together using the first pointer
1080  * in the tnode.
1081  */
1082
1083 /* yaffs_CreateTnodes creates a bunch more tnodes and
1084  * adds them to the tnode free list.
1085  * Don't use this function directly
1086  */
1087
1088 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
1089 {
1090         int i;
1091         int tnodeSize;
1092         yaffs_Tnode *newTnodes;
1093         __u8 *mem;
1094         yaffs_Tnode *curr;
1095         yaffs_Tnode *next;
1096         yaffs_TnodeList *tnl;
1097
1098         if (nTnodes < 1)
1099                 return YAFFS_OK;
1100
1101         /* Calculate the tnode size in bytes for variable width tnode support.
1102          * Must be a multiple of 32-bits  */
1103         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1104
1105         /* make these things */
1106
1107         newTnodes = YMALLOC(nTnodes * tnodeSize);
1108         mem = (__u8 *)newTnodes;
1109
1110         if (!newTnodes) {
1111                 T(YAFFS_TRACE_ERROR,
1112                   (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1113                 return YAFFS_FAIL;
1114         }
1115
1116         /* Hook them into the free list */
1117 #if 0
1118         for (i = 0; i < nTnodes - 1; i++) {
1119                 newTnodes[i].internal[0] = &newTnodes[i + 1];
1120 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1121                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1122 #endif
1123         }
1124
1125         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1126 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1127         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1128 #endif
1129         dev->freeTnodes = newTnodes;
1130 #else
1131         /* New hookup for wide tnodes */
1132         for(i = 0; i < nTnodes -1; i++) {
1133                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1134                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1135                 curr->internal[0] = next;
1136         }
1137
1138         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1139         curr->internal[0] = dev->freeTnodes;
1140         dev->freeTnodes = (yaffs_Tnode *)mem;
1141
1142 #endif
1143
1144
1145         dev->nFreeTnodes += nTnodes;
1146         dev->nTnodesCreated += nTnodes;
1147
1148         /* Now add this bunch of tnodes to a list for freeing up.
1149          * NB If we can't add this to the management list it isn't fatal
1150          * but it just means we can't free this bunch of tnodes later.
1151          */
1152
1153         tnl = YMALLOC(sizeof(yaffs_TnodeList));
1154         if (!tnl) {
1155                 T(YAFFS_TRACE_ERROR,
1156                   (TSTR
1157                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
1158                    return YAFFS_FAIL;
1159
1160         } else {
1161                 tnl->tnodes = newTnodes;
1162                 tnl->next = dev->allocatedTnodeList;
1163                 dev->allocatedTnodeList = tnl;
1164         }
1165
1166         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1167
1168         return YAFFS_OK;
1169 }
1170
1171 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1172
1173 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
1174 {
1175         yaffs_Tnode *tn = NULL;
1176
1177         /* If there are none left make more */
1178         if (!dev->freeTnodes) {
1179                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1180         }
1181
1182         if (dev->freeTnodes) {
1183                 tn = dev->freeTnodes;
1184 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1185                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1186                         /* Hoosterman, this thing looks like it isn't in the list */
1187                         T(YAFFS_TRACE_ALWAYS,
1188                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1189                 }
1190 #endif
1191                 dev->freeTnodes = dev->freeTnodes->internal[0];
1192                 dev->nFreeTnodes--;
1193         }
1194
1195         return tn;
1196 }
1197
1198 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
1199 {
1200         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1201
1202         if(tn)
1203                 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1204
1205         return tn;
1206 }
1207
1208 /* FreeTnode frees up a tnode and puts it back on the free list */
1209 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
1210 {
1211         if (tn) {
1212 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1213                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1214                         /* Hoosterman, this thing looks like it is already in the list */
1215                         T(YAFFS_TRACE_ALWAYS,
1216                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1217                 }
1218                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1219 #endif
1220                 tn->internal[0] = dev->freeTnodes;
1221                 dev->freeTnodes = tn;
1222                 dev->nFreeTnodes++;
1223         }
1224 }
1225
1226 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
1227 {
1228         /* Free the list of allocated tnodes */
1229         yaffs_TnodeList *tmp;
1230
1231         while (dev->allocatedTnodeList) {
1232                 tmp = dev->allocatedTnodeList->next;
1233
1234                 YFREE(dev->allocatedTnodeList->tnodes);
1235                 YFREE(dev->allocatedTnodeList);
1236                 dev->allocatedTnodeList = tmp;
1237
1238         }
1239
1240         dev->freeTnodes = NULL;
1241         dev->nFreeTnodes = 0;
1242 }
1243
1244 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
1245 {
1246         dev->allocatedTnodeList = NULL;
1247         dev->freeTnodes = NULL;
1248         dev->nFreeTnodes = 0;
1249         dev->nTnodesCreated = 0;
1250
1251 }
1252
1253
1254 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
1255 {
1256   __u32 *map = (__u32 *)tn;
1257   __u32 bitInMap;
1258   __u32 bitInWord;
1259   __u32 wordInMap;
1260   __u32 mask;
1261
1262   pos &= YAFFS_TNODES_LEVEL0_MASK;
1263   val >>= dev->chunkGroupBits;
1264
1265   bitInMap = pos * dev->tnodeWidth;
1266   wordInMap = bitInMap /32;
1267   bitInWord = bitInMap & (32 -1);
1268
1269   mask = dev->tnodeMask << bitInWord;
1270
1271   map[wordInMap] &= ~mask;
1272   map[wordInMap] |= (mask & (val << bitInWord));
1273
1274   if(dev->tnodeWidth > (32-bitInWord)) {
1275     bitInWord = (32 - bitInWord);
1276     wordInMap++;;
1277     mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1278     map[wordInMap] &= ~mask;
1279     map[wordInMap] |= (mask & (val >> bitInWord));
1280   }
1281 }
1282
1283 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
1284 {
1285   __u32 *map = (__u32 *)tn;
1286   __u32 bitInMap;
1287   __u32 bitInWord;
1288   __u32 wordInMap;
1289   __u32 val;
1290
1291   pos &= YAFFS_TNODES_LEVEL0_MASK;
1292
1293   bitInMap = pos * dev->tnodeWidth;
1294   wordInMap = bitInMap /32;
1295   bitInWord = bitInMap & (32 -1);
1296
1297   val = map[wordInMap] >> bitInWord;
1298
1299   if(dev->tnodeWidth > (32-bitInWord)) {
1300     bitInWord = (32 - bitInWord);
1301     wordInMap++;;
1302     val |= (map[wordInMap] << bitInWord);
1303   }
1304
1305   val &= dev->tnodeMask;
1306   val <<= dev->chunkGroupBits;
1307
1308   return val;
1309 }
1310
1311 /* ------------------- End of individual tnode manipulation -----------------*/
1312
1313 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1314  * The look up tree is represented by the top tnode and the number of topLevel
1315  * in the tree. 0 means only the level 0 tnode is in the tree.
1316  */
1317
1318 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1319 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
1320                                           yaffs_FileStructure * fStruct,
1321                                           __u32 chunkId)
1322 {
1323
1324         yaffs_Tnode *tn = fStruct->top;
1325         __u32 i;
1326         int requiredTallness;
1327         int level = fStruct->topLevel;
1328
1329         /* Check sane level and chunk Id */
1330         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
1331                 return NULL;
1332         }
1333
1334         if (chunkId > YAFFS_MAX_CHUNK_ID) {
1335                 return NULL;
1336         }
1337
1338         /* First check we're tall enough (ie enough topLevel) */
1339
1340         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1341         requiredTallness = 0;
1342         while (i) {
1343                 i >>= YAFFS_TNODES_INTERNAL_BITS;
1344                 requiredTallness++;
1345         }
1346
1347         if (requiredTallness > fStruct->topLevel) {
1348                 /* Not tall enough, so we can't find it, return NULL. */
1349                 return NULL;
1350         }
1351
1352         /* Traverse down to level 0 */
1353         while (level > 0 && tn) {
1354                 tn = tn->
1355                     internal[(chunkId >>
1356                                ( YAFFS_TNODES_LEVEL0_BITS +
1357                                  (level - 1) *
1358                                  YAFFS_TNODES_INTERNAL_BITS)
1359                               ) &
1360                              YAFFS_TNODES_INTERNAL_MASK];
1361                 level--;
1362
1363         }
1364
1365         return tn;
1366 }
1367
1368 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1369  * This happens in two steps:
1370  *  1. If the tree isn't tall enough, then make it taller.
1371  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1372  *
1373  * Used when modifying the tree.
1374  *
1375  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1376  *  be plugged into the ttree.
1377  */
1378
1379 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
1380                                                yaffs_FileStructure * fStruct,
1381                                                __u32 chunkId,
1382                                                yaffs_Tnode *passedTn)
1383 {
1384
1385         int requiredTallness;
1386         int i;
1387         int l;
1388         yaffs_Tnode *tn;
1389
1390         __u32 x;
1391
1392
1393         /* Check sane level and page Id */
1394         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
1395                 return NULL;
1396         }
1397
1398         if (chunkId > YAFFS_MAX_CHUNK_ID) {
1399                 return NULL;
1400         }
1401
1402         /* First check we're tall enough (ie enough topLevel) */
1403
1404         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1405         requiredTallness = 0;
1406         while (x) {
1407                 x >>= YAFFS_TNODES_INTERNAL_BITS;
1408                 requiredTallness++;
1409         }
1410
1411
1412         if (requiredTallness > fStruct->topLevel) {
1413                 /* Not tall enough,gotta make the tree taller */
1414                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1415
1416                         tn = yaffs_GetTnode(dev);
1417
1418                         if (tn) {
1419                                 tn->internal[0] = fStruct->top;
1420                                 fStruct->top = tn;
1421                         } else {
1422                                 T(YAFFS_TRACE_ERROR,
1423                                   (TSTR("yaffs: no more tnodes" TENDSTR)));
1424                         }
1425                 }
1426
1427                 fStruct->topLevel = requiredTallness;
1428         }
1429
1430         /* Traverse down to level 0, adding anything we need */
1431
1432         l = fStruct->topLevel;
1433         tn = fStruct->top;
1434
1435         if(l > 0) {
1436                 while (l > 0 && tn) {
1437                         x = (chunkId >>
1438                              ( YAFFS_TNODES_LEVEL0_BITS +
1439                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1440                             YAFFS_TNODES_INTERNAL_MASK;
1441
1442
1443                         if((l>1) && !tn->internal[x]){
1444                                 /* Add missing non-level-zero tnode */
1445                                 tn->internal[x] = yaffs_GetTnode(dev);
1446
1447                         } else if(l == 1) {
1448                                 /* Looking from level 1 at level 0 */
1449                                 if (passedTn) {
1450                                         /* If we already have one, then release it.*/
1451                                         if(tn->internal[x])
1452                                                 yaffs_FreeTnode(dev,tn->internal[x]);
1453                                         tn->internal[x] = passedTn;
1454
1455                                 } else if(!tn->internal[x]) {
1456                                         /* Don't have one, none passed in */
1457                                         tn->internal[x] = yaffs_GetTnode(dev);
1458                                 }
1459                         }
1460
1461                         tn = tn->internal[x];
1462                         l--;
1463                 }
1464         } else {
1465                 /* top is level 0 */
1466                 if(passedTn) {
1467                         memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1468                         yaffs_FreeTnode(dev,passedTn);
1469                 }
1470         }
1471
1472         return tn;
1473 }
1474
1475 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
1476                                   yaffs_ExtendedTags * tags, int objectId,
1477                                   int chunkInInode)
1478 {
1479         int j;
1480
1481         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1482                 if (yaffs_CheckChunkBit
1483                     (dev, theChunk / dev->nChunksPerBlock,
1484                      theChunk % dev->nChunksPerBlock)) {
1485                         yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1486                                                         tags);
1487                         if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1488                                 /* found it; */
1489                                 return theChunk;
1490
1491                         }
1492                 }
1493                 theChunk++;
1494         }
1495         return -1;
1496 }
1497
1498 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1499 {
1500
1501         yaffs_BlockInfo *theBlock;
1502
1503         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1504
1505         theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1506         if (theBlock) {
1507                 theBlock->softDeletions++;
1508                 dev->nFreeChunks++;
1509         }
1510 }
1511
1512 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1513  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1514  * of the tnode.
1515  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1516  */
1517
1518 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1519                                   __u32 level, int chunkOffset)
1520 {
1521         int i;
1522         int theChunk;
1523         int allDone = 1;
1524         yaffs_Device *dev = in->myDev;
1525
1526         if (tn) {
1527                 if (level > 0) {
1528
1529                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1530                              i--) {
1531                                 if (tn->internal[i]) {
1532                                         allDone =
1533                                             yaffs_SoftDeleteWorker(in,
1534                                                                    tn->
1535                                                                    internal[i],
1536                                                                    level - 1,
1537                                                                    (chunkOffset
1538                                                                     <<
1539                                                                     YAFFS_TNODES_INTERNAL_BITS)
1540                                                                    + i);
1541                                         if (allDone) {
1542                                                 yaffs_FreeTnode(dev,
1543                                                                 tn->
1544                                                                 internal[i]);
1545                                                 tn->internal[i] = NULL;
1546                                         } else {
1547                                                 /* Hoosterman... how could this happen? */
1548                                         }
1549                                 }
1550                         }
1551                         return (allDone) ? 1 : 0;
1552                 } else if (level == 0) {
1553
1554                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1555                                 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1556                                 if (theChunk) {
1557                                         /* Note this does not find the real chunk, only the chunk group.
1558                                          * We make an assumption that a chunk group is not larger than
1559                                          * a block.
1560                                          */
1561                                         yaffs_SoftDeleteChunk(dev, theChunk);
1562                                         yaffs_PutLevel0Tnode(dev,tn,i,0);
1563                                 }
1564
1565                         }
1566                         return 1;
1567
1568                 }
1569
1570         }
1571
1572         return 1;
1573
1574 }
1575
1576 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1577 {
1578         if (obj->deleted &&
1579             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1580                 if (obj->nDataChunks <= 0) {
1581                         /* Empty file with no duplicate object headers, just delete it immediately */
1582                         yaffs_FreeTnode(obj->myDev,
1583                                         obj->variant.fileVariant.top);
1584                         obj->variant.fileVariant.top = NULL;
1585                         T(YAFFS_TRACE_TRACING,
1586                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1587                            obj->objectId));
1588                         yaffs_DoGenericObjectDeletion(obj);
1589                 } else {
1590                         yaffs_SoftDeleteWorker(obj,
1591                                                obj->variant.fileVariant.top,
1592                                                obj->variant.fileVariant.
1593                                                topLevel, 0);
1594                         obj->softDeleted = 1;
1595                 }
1596         }
1597 }
1598
1599 /* Pruning removes any part of the file structure tree that is beyond the
1600  * bounds of the file (ie that does not point to chunks).
1601  *
1602  * A file should only get pruned when its size is reduced.
1603  *
1604  * Before pruning, the chunks must be pulled from the tree and the
1605  * level 0 tnode entries must be zeroed out.
1606  * Could also use this for file deletion, but that's probably better handled
1607  * by a special case.
1608  */
1609
1610 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1611                                       __u32 level, int del0)
1612 {
1613         int i;
1614         int hasData;
1615
1616         if (tn) {
1617                 hasData = 0;
1618
1619                 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1620                         if (tn->internal[i] && level > 0) {
1621                                 tn->internal[i] =
1622                                     yaffs_PruneWorker(dev, tn->internal[i],
1623                                                       level - 1,
1624                                                       (i == 0) ? del0 : 1);
1625                         }
1626
1627                         if (tn->internal[i]) {
1628                                 hasData++;
1629                         }
1630                 }
1631
1632                 if (hasData == 0 && del0) {
1633                         /* Free and return NULL */
1634
1635                         yaffs_FreeTnode(dev, tn);
1636                         tn = NULL;
1637                 }
1638
1639         }
1640
1641         return tn;
1642
1643 }
1644
1645 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1646                                     yaffs_FileStructure * fStruct)
1647 {
1648         int i;
1649         int hasData;
1650         int done = 0;
1651         yaffs_Tnode *tn;
1652
1653         if (fStruct->topLevel > 0) {
1654                 fStruct->top =
1655                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1656
1657                 /* Now we have a tree with all the non-zero branches NULL but the height
1658                  * is the same as it was.
1659                  * Let's see if we can trim internal tnodes to shorten the tree.
1660                  * We can do this if only the 0th element in the tnode is in use
1661                  * (ie all the non-zero are NULL)
1662                  */
1663
1664                 while (fStruct->topLevel && !done) {
1665                         tn = fStruct->top;
1666
1667                         hasData = 0;
1668                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1669                                 if (tn->internal[i]) {
1670                                         hasData++;
1671                                 }
1672                         }
1673
1674                         if (!hasData) {
1675                                 fStruct->top = tn->internal[0];
1676                                 fStruct->topLevel--;
1677                                 yaffs_FreeTnode(dev, tn);
1678                         } else {
1679                                 done = 1;
1680                         }
1681                 }
1682         }
1683
1684         return YAFFS_OK;
1685 }
1686
1687 /*-------------------- End of File Structure functions.-------------------*/
1688
1689 /* yaffs_CreateFreeObjects creates a bunch more objects and
1690  * adds them to the object free list.
1691  */
1692 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1693 {
1694         int i;
1695         yaffs_Object *newObjects;
1696         yaffs_ObjectList *list;
1697
1698         if (nObjects < 1)
1699                 return YAFFS_OK;
1700
1701         /* make these things */
1702         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1703         list = YMALLOC(sizeof(yaffs_ObjectList));
1704
1705         if (!newObjects || !list) {
1706                 if(newObjects)
1707                         YFREE(newObjects);
1708                 if(list)
1709                         YFREE(list);
1710                 T(YAFFS_TRACE_ALLOCATE,
1711                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1712                 return YAFFS_FAIL;
1713         }
1714
1715         /* Hook them into the free list */
1716         for (i = 0; i < nObjects - 1; i++) {
1717                 newObjects[i].siblings.next =
1718                     (struct list_head *)(&newObjects[i + 1]);
1719         }
1720
1721         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1722         dev->freeObjects = newObjects;
1723         dev->nFreeObjects += nObjects;
1724         dev->nObjectsCreated += nObjects;
1725
1726         /* Now add this bunch of Objects to a list for freeing up. */
1727
1728         list->objects = newObjects;
1729         list->next = dev->allocatedObjectList;
1730         dev->allocatedObjectList = list;
1731
1732         return YAFFS_OK;
1733 }
1734
1735
1736 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1737 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1738 {
1739         yaffs_Object *tn = NULL;
1740
1741         /* If there are none left make more */
1742         if (!dev->freeObjects) {
1743                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1744         }
1745
1746         if (dev->freeObjects) {
1747                 tn = dev->freeObjects;
1748                 dev->freeObjects =
1749                     (yaffs_Object *) (dev->freeObjects->siblings.next);
1750                 dev->nFreeObjects--;
1751
1752                 /* Now sweeten it up... */
1753
1754                 memset(tn, 0, sizeof(yaffs_Object));
1755                 tn->myDev = dev;
1756                 tn->chunkId = -1;
1757                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1758                 INIT_LIST_HEAD(&(tn->hardLinks));
1759                 INIT_LIST_HEAD(&(tn->hashLink));
1760                 INIT_LIST_HEAD(&tn->siblings);
1761
1762                 /* Add it to the lost and found directory.
1763                  * NB Can't put root or lostNFound in lostNFound so
1764                  * check if lostNFound exists first
1765                  */
1766                 if (dev->lostNFoundDir) {
1767                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1768                 }
1769         }
1770
1771         return tn;
1772 }
1773
1774 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1775                                                __u32 mode)
1776 {
1777
1778         yaffs_Object *obj =
1779             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1780         if (obj) {
1781                 obj->fake = 1;          /* it is fake so it has no NAND presence... */
1782                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1783                 obj->unlinkAllowed = 0; /* ... or unlink it */
1784                 obj->deleted = 0;
1785                 obj->unlinked = 0;
1786                 obj->yst_mode = mode;
1787                 obj->myDev = dev;
1788                 obj->chunkId = 0;       /* Not a valid chunk. */
1789         }
1790
1791         return obj;
1792
1793 }
1794
1795 static void yaffs_UnhashObject(yaffs_Object * tn)
1796 {
1797         int bucket;
1798         yaffs_Device *dev = tn->myDev;
1799
1800         /* If it is still linked into the bucket list, free from the list */
1801         if (!list_empty(&tn->hashLink)) {
1802                 list_del_init(&tn->hashLink);
1803                 bucket = yaffs_HashFunction(tn->objectId);
1804                 dev->objectBucket[bucket].count--;
1805         }
1806
1807 }
1808
1809 /*  FreeObject frees up a Object and puts it back on the free list */
1810 static void yaffs_FreeObject(yaffs_Object * tn)
1811 {
1812
1813         yaffs_Device *dev = tn->myDev;
1814
1815 /* XXX U-BOOT XXX */
1816 #if 0
1817 #ifdef  __KERNEL__
1818         if (tn->myInode) {
1819                 /* We're still hooked up to a cached inode.
1820                  * Don't delete now, but mark for later deletion
1821                  */
1822                 tn->deferedFree = 1;
1823                 return;
1824         }
1825 #endif
1826 #endif
1827         yaffs_UnhashObject(tn);
1828
1829         /* Link into the free list. */
1830         tn->siblings.next = (struct list_head *)(dev->freeObjects);
1831         dev->freeObjects = tn;
1832         dev->nFreeObjects++;
1833 }
1834
1835 /* XXX U-BOOT XXX */
1836 #if 0
1837 #ifdef __KERNEL__
1838
1839 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1840 {
1841         if (obj->deferedFree) {
1842                 yaffs_FreeObject(obj);
1843         }
1844 }
1845
1846 #endif
1847 #endif
1848
1849 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1850 {
1851         /* Free the list of allocated Objects */
1852
1853         yaffs_ObjectList *tmp;
1854
1855         while (dev->allocatedObjectList) {
1856                 tmp = dev->allocatedObjectList->next;
1857                 YFREE(dev->allocatedObjectList->objects);
1858                 YFREE(dev->allocatedObjectList);
1859
1860                 dev->allocatedObjectList = tmp;
1861         }
1862
1863         dev->freeObjects = NULL;
1864         dev->nFreeObjects = 0;
1865 }
1866
1867 static void yaffs_InitialiseObjects(yaffs_Device * dev)
1868 {
1869         int i;
1870
1871         dev->allocatedObjectList = NULL;
1872         dev->freeObjects = NULL;
1873         dev->nFreeObjects = 0;
1874
1875         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1876                 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1877                 dev->objectBucket[i].count = 0;
1878         }
1879
1880 }
1881
1882 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
1883 {
1884         static int x = 0;
1885         int i;
1886         int l = 999;
1887         int lowest = 999999;
1888
1889         /* First let's see if we can find one that's empty. */
1890
1891         for (i = 0; i < 10 && lowest > 0; i++) {
1892                 x++;
1893                 x %= YAFFS_NOBJECT_BUCKETS;
1894                 if (dev->objectBucket[x].count < lowest) {
1895                         lowest = dev->objectBucket[x].count;
1896                         l = x;
1897                 }
1898
1899         }
1900
1901         /* If we didn't find an empty list, then try
1902          * looking a bit further for a short one
1903          */
1904
1905         for (i = 0; i < 10 && lowest > 3; i++) {
1906                 x++;
1907                 x %= YAFFS_NOBJECT_BUCKETS;
1908                 if (dev->objectBucket[x].count < lowest) {
1909                         lowest = dev->objectBucket[x].count;
1910                         l = x;
1911                 }
1912
1913         }
1914
1915         return l;
1916 }
1917
1918 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
1919 {
1920         int bucket = yaffs_FindNiceObjectBucket(dev);
1921
1922         /* Now find an object value that has not already been taken
1923          * by scanning the list.
1924          */
1925
1926         int found = 0;
1927         struct list_head *i;
1928
1929         __u32 n = (__u32) bucket;
1930
1931         /* yaffs_CheckObjectHashSanity();  */
1932
1933         while (!found) {
1934                 found = 1;
1935                 n += YAFFS_NOBJECT_BUCKETS;
1936                 if (1 || dev->objectBucket[bucket].count > 0) {
1937                         list_for_each(i, &dev->objectBucket[bucket].list) {
1938                                 /* If there is already one in the list */
1939                                 if (i
1940                                     && list_entry(i, yaffs_Object,
1941                                                   hashLink)->objectId == n) {
1942                                         found = 0;
1943                                 }
1944                         }
1945                 }
1946         }
1947
1948
1949         return n;
1950 }
1951
1952 static void yaffs_HashObject(yaffs_Object * in)
1953 {
1954         int bucket = yaffs_HashFunction(in->objectId);
1955         yaffs_Device *dev = in->myDev;
1956
1957         list_add(&in->hashLink, &dev->objectBucket[bucket].list);
1958         dev->objectBucket[bucket].count++;
1959
1960 }
1961
1962 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
1963 {
1964         int bucket = yaffs_HashFunction(number);
1965         struct list_head *i;
1966         yaffs_Object *in;
1967
1968         list_for_each(i, &dev->objectBucket[bucket].list) {
1969                 /* Look if it is in the list */
1970                 if (i) {
1971                         in = list_entry(i, yaffs_Object, hashLink);
1972                         if (in->objectId == number) {
1973 /* XXX U-BOOT XXX */
1974 #if 0
1975 #ifdef __KERNEL__
1976                                 /* Don't tell the VFS about this one if it is defered free */
1977                                 if (in->deferedFree)
1978                                         return NULL;
1979 #endif
1980 #endif
1981                                 return in;
1982                         }
1983                 }
1984         }
1985
1986         return NULL;
1987 }
1988
1989 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
1990                                     yaffs_ObjectType type)
1991 {
1992
1993         yaffs_Object *theObject;
1994         yaffs_Tnode *tn = NULL;
1995
1996         if (number < 0) {
1997                 number = yaffs_CreateNewObjectNumber(dev);
1998         }
1999
2000         theObject = yaffs_AllocateEmptyObject(dev);
2001         if(!theObject)
2002                 return NULL;
2003
2004         if(type == YAFFS_OBJECT_TYPE_FILE){
2005                 tn = yaffs_GetTnode(dev);
2006                 if(!tn){
2007                         yaffs_FreeObject(theObject);
2008                         return NULL;
2009                 }
2010         }
2011
2012
2013
2014         if (theObject) {
2015                 theObject->fake = 0;
2016                 theObject->renameAllowed = 1;
2017                 theObject->unlinkAllowed = 1;
2018                 theObject->objectId = number;
2019                 yaffs_HashObject(theObject);
2020                 theObject->variantType = type;
2021 #ifdef CONFIG_YAFFS_WINCE
2022                 yfsd_WinFileTimeNow(theObject->win_atime);
2023                 theObject->win_ctime[0] = theObject->win_mtime[0] =
2024                     theObject->win_atime[0];
2025                 theObject->win_ctime[1] = theObject->win_mtime[1] =
2026                     theObject->win_atime[1];
2027
2028 #else
2029
2030                 theObject->yst_atime = theObject->yst_mtime =
2031                     theObject->yst_ctime = Y_CURRENT_TIME;
2032 #endif
2033                 switch (type) {
2034                 case YAFFS_OBJECT_TYPE_FILE:
2035                         theObject->variant.fileVariant.fileSize = 0;
2036                         theObject->variant.fileVariant.scannedFileSize = 0;
2037                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2038                         theObject->variant.fileVariant.topLevel = 0;
2039                         theObject->variant.fileVariant.top = tn;
2040                         break;
2041                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2042                         INIT_LIST_HEAD(&theObject->variant.directoryVariant.
2043                                        children);
2044                         break;
2045                 case YAFFS_OBJECT_TYPE_SYMLINK:
2046                 case YAFFS_OBJECT_TYPE_HARDLINK:
2047                 case YAFFS_OBJECT_TYPE_SPECIAL:
2048                         /* No action required */
2049                         break;
2050                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2051                         /* todo this should not happen */
2052                         break;
2053                 }
2054         }
2055
2056         return theObject;
2057 }
2058
2059 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
2060                                                       int number,
2061                                                       yaffs_ObjectType type)
2062 {
2063         yaffs_Object *theObject = NULL;
2064
2065         if (number > 0) {
2066                 theObject = yaffs_FindObjectByNumber(dev, number);
2067         }
2068
2069         if (!theObject) {
2070                 theObject = yaffs_CreateNewObject(dev, number, type);
2071         }
2072
2073         return theObject;
2074
2075 }
2076
2077
2078 static YCHAR *yaffs_CloneString(const YCHAR * str)
2079 {
2080         YCHAR *newStr = NULL;
2081
2082         if (str && *str) {
2083                 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2084                 if(newStr)
2085                         yaffs_strcpy(newStr, str);
2086         }
2087
2088         return newStr;
2089
2090 }
2091
2092 /*
2093  * Mknod (create) a new object.
2094  * equivalentObject only has meaning for a hard link;
2095  * aliasString only has meaning for a sumlink.
2096  * rdev only has meaning for devices (a subset of special objects)
2097  */
2098
2099 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2100                                        yaffs_Object * parent,
2101                                        const YCHAR * name,
2102                                        __u32 mode,
2103                                        __u32 uid,
2104                                        __u32 gid,
2105                                        yaffs_Object * equivalentObject,
2106                                        const YCHAR * aliasString, __u32 rdev)
2107 {
2108         yaffs_Object *in;
2109         YCHAR *str = NULL;
2110
2111         yaffs_Device *dev = parent->myDev;
2112
2113         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2114         if (yaffs_FindObjectByName(parent, name)) {
2115                 return NULL;
2116         }
2117
2118         in = yaffs_CreateNewObject(dev, -1, type);
2119
2120         if(type == YAFFS_OBJECT_TYPE_SYMLINK){
2121                 str = yaffs_CloneString(aliasString);
2122                 if(!str){
2123                         yaffs_FreeObject(in);
2124                         return NULL;
2125                 }
2126         }
2127
2128
2129
2130         if (in) {
2131                 in->chunkId = -1;
2132                 in->valid = 1;
2133                 in->variantType = type;
2134
2135                 in->yst_mode = mode;
2136
2137 #ifdef CONFIG_YAFFS_WINCE
2138                 yfsd_WinFileTimeNow(in->win_atime);
2139                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2140                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2141
2142 #else
2143                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2144
2145                 in->yst_rdev = rdev;
2146                 in->yst_uid = uid;
2147                 in->yst_gid = gid;
2148 #endif
2149                 in->nDataChunks = 0;
2150
2151                 yaffs_SetObjectName(in, name);
2152                 in->dirty = 1;
2153
2154                 yaffs_AddObjectToDirectory(parent, in);
2155
2156                 in->myDev = parent->myDev;
2157
2158                 switch (type) {
2159                 case YAFFS_OBJECT_TYPE_SYMLINK:
2160                         in->variant.symLinkVariant.alias = str;
2161                         break;
2162                 case YAFFS_OBJECT_TYPE_HARDLINK:
2163                         in->variant.hardLinkVariant.equivalentObject =
2164                             equivalentObject;
2165                         in->variant.hardLinkVariant.equivalentObjectId =
2166                             equivalentObject->objectId;
2167                         list_add(&in->hardLinks, &equivalentObject->hardLinks);
2168                         break;
2169                 case YAFFS_OBJECT_TYPE_FILE:
2170                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2171                 case YAFFS_OBJECT_TYPE_SPECIAL:
2172                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2173                         /* do nothing */
2174                         break;
2175                 }
2176
2177                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2178                         /* Could not create the object header, fail the creation */
2179                         yaffs_DestroyObject(in);
2180                         in = NULL;
2181                 }
2182
2183         }
2184
2185         return in;
2186 }
2187
2188 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
2189                               __u32 mode, __u32 uid, __u32 gid)
2190 {
2191         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2192                                  uid, gid, NULL, NULL, 0);
2193 }
2194
2195 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
2196                                    __u32 mode, __u32 uid, __u32 gid)
2197 {
2198         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2199                                  mode, uid, gid, NULL, NULL, 0);
2200 }
2201
2202 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
2203                                  __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2204 {
2205         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2206                                  uid, gid, NULL, NULL, rdev);
2207 }
2208
2209 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
2210                                  __u32 mode, __u32 uid, __u32 gid,
2211                                  const YCHAR * alias)
2212 {
2213         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2214                                  uid, gid, NULL, alias, 0);
2215 }
2216
2217 /* yaffs_Link returns the object id of the equivalent object.*/
2218 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
2219                          yaffs_Object * equivalentObject)
2220 {
2221         /* Get the real object in case we were fed a hard link as an equivalent object */
2222         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2223
2224         if (yaffs_MknodObject
2225             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2226              equivalentObject, NULL, 0)) {
2227                 return equivalentObject;
2228         } else {
2229                 return NULL;
2230         }
2231
2232 }
2233
2234 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
2235                                   const YCHAR * newName, int force, int shadows)
2236 {
2237         int unlinkOp;
2238         int deleteOp;
2239
2240         yaffs_Object *existingTarget;
2241
2242         if (newDir == NULL) {
2243                 newDir = obj->parent;   /* use the old directory */
2244         }
2245
2246         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2247                 T(YAFFS_TRACE_ALWAYS,
2248                   (TSTR
2249                    ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
2250                     TENDSTR)));
2251                 YBUG();
2252         }
2253
2254         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2255         if (obj->myDev->isYaffs2) {
2256                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2257         } else {
2258                 unlinkOp = (newDir == obj->myDev->unlinkedDir
2259                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2260         }
2261
2262         deleteOp = (newDir == obj->myDev->deletedDir);
2263
2264         existingTarget = yaffs_FindObjectByName(newDir, newName);
2265
2266         /* If the object is a file going into the unlinked directory,
2267          *   then it is OK to just stuff it in since duplicate names are allowed.
2268          *   else only proceed if the new name does not exist and if we're putting
2269          *   it into a directory.
2270          */
2271         if ((unlinkOp ||
2272              deleteOp ||
2273              force ||
2274              (shadows > 0) ||
2275              !existingTarget) &&
2276             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2277                 yaffs_SetObjectName(obj, newName);
2278                 obj->dirty = 1;
2279
2280                 yaffs_AddObjectToDirectory(newDir, obj);
2281
2282                 if (unlinkOp)
2283                         obj->unlinked = 1;
2284
2285                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2286                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
2287                         return YAFFS_OK;
2288         }
2289
2290         return YAFFS_FAIL;
2291 }
2292
2293 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
2294                        yaffs_Object * newDir, const YCHAR * newName)
2295 {
2296         yaffs_Object *obj;
2297         yaffs_Object *existingTarget;
2298         int force = 0;
2299
2300 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2301         /* Special case for case insemsitive systems (eg. WinCE).
2302          * While look-up is case insensitive, the name isn't.
2303          * Therefore we might want to change x.txt to X.txt
2304         */
2305         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
2306                 force = 1;
2307         }
2308 #endif
2309
2310         obj = yaffs_FindObjectByName(oldDir, oldName);
2311         /* Check new name to long. */
2312         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
2313             yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
2314           /* ENAMETOOLONG */
2315           return YAFFS_FAIL;
2316         else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
2317                  yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2318           /* ENAMETOOLONG */
2319           return YAFFS_FAIL;
2320
2321         if (obj && obj->renameAllowed) {
2322
2323                 /* Now do the handling for an existing target, if there is one */
2324
2325                 existingTarget = yaffs_FindObjectByName(newDir, newName);
2326                 if (existingTarget &&
2327                     existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2328                     !list_empty(&existingTarget->variant.directoryVariant.children)) {
2329                         /* There is a target that is a non-empty directory, so we fail */
2330                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
2331                 } else if (existingTarget && existingTarget != obj) {
2332                         /* Nuke the target first, using shadowing,
2333                          * but only if it isn't the same object
2334                          */
2335                         yaffs_ChangeObjectName(obj, newDir, newName, force,
2336                                                existingTarget->objectId);
2337                         yaffs_UnlinkObject(existingTarget);
2338                 }
2339
2340                 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2341         }
2342         return YAFFS_FAIL;
2343 }
2344
2345 /*------------------------- Block Management and Page Allocation ----------------*/
2346
2347 static int yaffs_InitialiseBlocks(yaffs_Device * dev)
2348 {
2349         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2350
2351         dev->blockInfo = NULL;
2352         dev->chunkBits = NULL;
2353
2354         dev->allocationBlock = -1;      /* force it to get a new one */
2355
2356         /* If the first allocation strategy fails, thry the alternate one */
2357         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2358         if(!dev->blockInfo){
2359                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2360                 dev->blockInfoAlt = 1;
2361         }
2362         else
2363                 dev->blockInfoAlt = 0;
2364
2365         if(dev->blockInfo){
2366
2367                 /* Set up dynamic blockinfo stuff. */
2368                 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2369                 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2370                 if(!dev->chunkBits){
2371                         dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2372                         dev->chunkBitsAlt = 1;
2373                 }
2374                 else
2375                         dev->chunkBitsAlt = 0;
2376         }
2377
2378         if (dev->blockInfo && dev->chunkBits) {
2379                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2380                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2381                 return YAFFS_OK;
2382         }
2383
2384         return YAFFS_FAIL;
2385
2386 }
2387
2388 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
2389 {
2390         if(dev->blockInfoAlt && dev->blockInfo)
2391                 YFREE_ALT(dev->blockInfo);
2392         else if(dev->blockInfo)
2393                 YFREE(dev->blockInfo);
2394
2395         dev->blockInfoAlt = 0;
2396
2397         dev->blockInfo = NULL;
2398
2399         if(dev->chunkBitsAlt && dev->chunkBits)
2400                 YFREE_ALT(dev->chunkBits);
2401         else if(dev->chunkBits)
2402                 YFREE(dev->chunkBits);
2403         dev->chunkBitsAlt = 0;
2404         dev->chunkBits = NULL;
2405 }
2406
2407 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
2408                                             yaffs_BlockInfo * bi)
2409 {
2410         int i;
2411         __u32 seq;
2412         yaffs_BlockInfo *b;
2413
2414         if (!dev->isYaffs2)
2415                 return 1;       /* disqualification only applies to yaffs2. */
2416
2417         if (!bi->hasShrinkHeader)
2418                 return 1;       /* can gc */
2419
2420         /* Find the oldest dirty sequence number if we don't know it and save it
2421          * so we don't have to keep recomputing it.
2422          */
2423         if (!dev->oldestDirtySequence) {
2424                 seq = dev->sequenceNumber;
2425
2426                 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2427                      i++) {
2428                         b = yaffs_GetBlockInfo(dev, i);
2429                         if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2430                             (b->pagesInUse - b->softDeletions) <
2431                             dev->nChunksPerBlock && b->sequenceNumber < seq) {
2432                                 seq = b->sequenceNumber;
2433                         }
2434                 }
2435                 dev->oldestDirtySequence = seq;
2436         }
2437
2438         /* Can't do gc of this block if there are any blocks older than this one that have
2439          * discarded pages.
2440          */
2441         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2442
2443 }
2444
2445 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2446  * for garbage collection.
2447  */
2448
2449 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
2450                                                int aggressive)
2451 {
2452
2453         int b = dev->currentDirtyChecker;
2454
2455         int i;
2456         int iterations;
2457         int dirtiest = -1;
2458         int pagesInUse = 0;
2459         int prioritised=0;
2460         yaffs_BlockInfo *bi;
2461         int pendingPrioritisedExist = 0;
2462
2463         /* First let's see if we need to grab a prioritised block */
2464         if(dev->hasPendingPrioritisedGCs){
2465                 for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
2466
2467                         bi = yaffs_GetBlockInfo(dev, i);
2468                         //yaffs_VerifyBlock(dev,bi,i);
2469
2470                         if(bi->gcPrioritise) {
2471                                 pendingPrioritisedExist = 1;
2472                                 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2473                                    yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
2474                                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2475                                         dirtiest = i;
2476                                         prioritised = 1;
2477                                         aggressive = 1; /* Fool the non-aggressive skip logiv below */
2478                                 }
2479                         }
2480                 }
2481
2482                 if(!pendingPrioritisedExist) /* None found, so we can clear this */
2483                         dev->hasPendingPrioritisedGCs = 0;
2484         }
2485
2486         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2487          * search harder.
2488          * else (we're doing a leasurely gc), then we only bother to do this if the
2489          * block has only a few pages in use.
2490          */
2491
2492         dev->nonAggressiveSkip--;
2493
2494         if (!aggressive && (dev->nonAggressiveSkip > 0)) {
2495                 return -1;
2496         }
2497
2498         if(!prioritised)
2499                 pagesInUse =
2500                         (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2501
2502         if (aggressive) {
2503                 iterations =
2504                     dev->internalEndBlock - dev->internalStartBlock + 1;
2505         } else {
2506                 iterations =
2507                     dev->internalEndBlock - dev->internalStartBlock + 1;
2508                 iterations = iterations / 16;
2509                 if (iterations > 200) {
2510                         iterations = 200;
2511                 }
2512         }
2513
2514         for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2515                 b++;
2516                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2517                         b = dev->internalStartBlock;
2518                 }
2519
2520                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2521                         T(YAFFS_TRACE_ERROR,
2522                           (TSTR("**>> Block %d is not valid" TENDSTR), b));
2523                         YBUG();
2524                 }
2525
2526                 bi = yaffs_GetBlockInfo(dev, b);
2527
2528 #if 0
2529                 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
2530                         dirtiest = b;
2531                         pagesInUse = 0;
2532                 }
2533                 else
2534 #endif
2535
2536                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2537                        (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2538                         yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2539                         dirtiest = b;
2540                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2541                 }
2542         }
2543
2544         dev->currentDirtyChecker = b;
2545
2546         if (dirtiest > 0) {
2547                 T(YAFFS_TRACE_GC,
2548                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2549                    dev->nChunksPerBlock - pagesInUse,prioritised));
2550         }
2551
2552         dev->oldestDirtySequence = 0;
2553
2554         if (dirtiest > 0) {
2555                 dev->nonAggressiveSkip = 4;
2556         }
2557
2558         return dirtiest;
2559 }
2560
2561 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
2562 {
2563         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2564
2565         int erasedOk = 0;
2566
2567         /* If the block is still healthy erase it and mark as clean.
2568          * If the block has had a data failure, then retire it.
2569          */
2570
2571         T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2572                 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2573                 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2574
2575         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2576
2577         if (!bi->needsRetiring) {
2578                 yaffs_InvalidateCheckpoint(dev);
2579                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2580                 if (!erasedOk) {
2581                         dev->nErasureFailures++;
2582                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2583                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2584                 }
2585         }
2586
2587         if (erasedOk &&
2588             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2589                 int i;
2590                 for (i = 0; i < dev->nChunksPerBlock; i++) {
2591                         if (!yaffs_CheckChunkErased
2592                             (dev, blockNo * dev->nChunksPerBlock + i)) {
2593                                 T(YAFFS_TRACE_ERROR,
2594                                   (TSTR
2595                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2596                                     TENDSTR), blockNo, i));
2597                         }
2598                 }
2599         }
2600
2601         if (erasedOk) {
2602                 /* Clean it up... */
2603                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2604                 dev->nErasedBlocks++;
2605                 bi->pagesInUse = 0;
2606                 bi->softDeletions = 0;
2607                 bi->hasShrinkHeader = 0;
2608                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2609                 bi->gcPrioritise = 0;
2610                 yaffs_ClearChunkBits(dev, blockNo);
2611
2612                 T(YAFFS_TRACE_ERASE,
2613                   (TSTR("Erased block %d" TENDSTR), blockNo));
2614         } else {
2615                 dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
2616
2617                 yaffs_RetireBlock(dev, blockNo);
2618                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2619                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2620         }
2621 }
2622
2623 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2624 {
2625         int i;
2626
2627         yaffs_BlockInfo *bi;
2628
2629         if (dev->nErasedBlocks < 1) {
2630                 /* Hoosterman we've got a problem.
2631                  * Can't get space to gc
2632                  */
2633                 T(YAFFS_TRACE_ERROR,
2634                   (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2635
2636                 return -1;
2637         }
2638
2639         /* Find an empty block. */
2640
2641         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2642                 dev->allocationBlockFinder++;
2643                 if (dev->allocationBlockFinder < dev->internalStartBlock
2644                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2645                         dev->allocationBlockFinder = dev->internalStartBlock;
2646                 }
2647
2648                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2649
2650                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2651                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2652                         dev->sequenceNumber++;
2653                         bi->sequenceNumber = dev->sequenceNumber;
2654                         dev->nErasedBlocks--;
2655                         T(YAFFS_TRACE_ALLOCATE,
2656                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2657                            dev->allocationBlockFinder, dev->sequenceNumber,
2658                            dev->nErasedBlocks));
2659                         return dev->allocationBlockFinder;
2660                 }
2661         }
2662
2663         T(YAFFS_TRACE_ALWAYS,
2664           (TSTR
2665            ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2666             TENDSTR), dev->nErasedBlocks));
2667
2668         return -1;
2669 }
2670
2671
2672 // Check if there's space to allocate...
2673 // Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2674 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2675 {
2676         int reservedChunks;
2677         int reservedBlocks = dev->nReservedBlocks;
2678         int checkpointBlocks;
2679
2680         checkpointBlocks =  dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
2681         if(checkpointBlocks < 0)
2682                 checkpointBlocks = 0;
2683
2684         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2685
2686         return (dev->nFreeChunks > reservedChunks);
2687 }
2688
2689 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
2690 {
2691         int retVal;
2692         yaffs_BlockInfo *bi;
2693
2694         if (dev->allocationBlock < 0) {
2695                 /* Get next block to allocate off */
2696                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2697                 dev->allocationPage = 0;
2698         }
2699
2700         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2701                 /* Not enough space to allocate unless we're allowed to use the reserve. */
2702                 return -1;
2703         }
2704
2705         if (dev->nErasedBlocks < dev->nReservedBlocks
2706             && dev->allocationPage == 0) {
2707                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2708         }
2709
2710         /* Next page please.... */
2711         if (dev->allocationBlock >= 0) {
2712                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2713
2714                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2715                     dev->allocationPage;
2716                 bi->pagesInUse++;
2717                 yaffs_SetChunkBit(dev, dev->allocationBlock,
2718                                   dev->allocationPage);
2719
2720                 dev->allocationPage++;
2721
2722                 dev->nFreeChunks--;
2723
2724                 /* If the block is full set the state to full */
2725                 if (dev->allocationPage >= dev->nChunksPerBlock) {
2726                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2727                         dev->allocationBlock = -1;
2728                 }
2729
2730                 if(blockUsedPtr)
2731                         *blockUsedPtr = bi;
2732
2733                 return retVal;
2734         }
2735
2736         T(YAFFS_TRACE_ERROR,
2737           (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2738
2739         return -1;
2740 }
2741
2742 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2743 {
2744         int n;
2745
2746         n = dev->nErasedBlocks * dev->nChunksPerBlock;
2747
2748         if (dev->allocationBlock > 0) {
2749                 n += (dev->nChunksPerBlock - dev->allocationPage);
2750         }
2751
2752         return n;
2753
2754 }
2755
2756 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2757 {
2758         int oldChunk;
2759         int newChunk;
2760         int chunkInBlock;
2761         int markNAND;
2762         int retVal = YAFFS_OK;
2763         int cleanups = 0;
2764         int i;
2765         int isCheckpointBlock;
2766         int matchingChunk;
2767
2768         int chunksBefore = yaffs_GetErasedChunks(dev);
2769         int chunksAfter;
2770
2771         yaffs_ExtendedTags tags;
2772
2773         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2774
2775         yaffs_Object *object;
2776
2777         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2778
2779         bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2780
2781         T(YAFFS_TRACE_TRACING,
2782           (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2783            bi->pagesInUse, bi->hasShrinkHeader));
2784
2785         /*yaffs_VerifyFreeChunks(dev); */
2786
2787         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
2788
2789         /* Take off the number of soft deleted entries because
2790          * they're going to get really deleted during GC.
2791          */
2792         dev->nFreeChunks -= bi->softDeletions;
2793
2794         dev->isDoingGC = 1;
2795
2796         if (isCheckpointBlock ||
2797             !yaffs_StillSomeChunkBits(dev, block)) {
2798                 T(YAFFS_TRACE_TRACING,
2799                   (TSTR
2800                    ("Collecting block %d that has no chunks in use" TENDSTR),
2801                    block));
2802                 yaffs_BlockBecameDirty(dev, block);
2803         } else {
2804
2805                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2806
2807                 yaffs_VerifyBlock(dev,bi,block);
2808
2809                 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2810                      chunkInBlock < dev->nChunksPerBlock
2811                      && yaffs_StillSomeChunkBits(dev, block);
2812                      chunkInBlock++, oldChunk++) {
2813                         if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2814
2815                                 /* This page is in use and might need to be copied off */
2816
2817                                 markNAND = 1;
2818
2819                                 yaffs_InitialiseTags(&tags);
2820
2821                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2822                                                                 buffer, &tags);
2823
2824                                 object =
2825                                     yaffs_FindObjectByNumber(dev,
2826                                                              tags.objectId);
2827
2828                                 T(YAFFS_TRACE_GC_DETAIL,
2829                                   (TSTR
2830                                    ("Collecting page %d, %d %d %d " TENDSTR),
2831                                    chunkInBlock, tags.objectId, tags.chunkId,
2832                                    tags.byteCount));
2833
2834                                 if(object && !yaffs_SkipVerification(dev)){
2835                                         if(tags.chunkId == 0)
2836                                                 matchingChunk = object->chunkId;
2837                                         else if(object->softDeleted)
2838                                                 matchingChunk = oldChunk; /* Defeat the test */
2839                                         else
2840                                                 matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
2841
2842                                         if(oldChunk != matchingChunk)
2843                                                 T(YAFFS_TRACE_ERROR,
2844                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2845                                                   oldChunk,matchingChunk,tags.objectId, tags.chunkId));
2846
2847                                 }
2848
2849                                 if (!object) {
2850                                         T(YAFFS_TRACE_ERROR,
2851                                           (TSTR
2852                                            ("page %d in gc has no object: %d %d %d "
2853                                             TENDSTR), oldChunk,
2854                                             tags.objectId, tags.chunkId, tags.byteCount));
2855                                 }
2856
2857                                 if (object && object->deleted
2858                                     && tags.chunkId != 0) {
2859                                         /* Data chunk in a deleted file, throw it away
2860                                          * It's a soft deleted data chunk,
2861                                          * No need to copy this, just forget about it and
2862                                          * fix up the object.
2863                                          */
2864
2865                                         object->nDataChunks--;
2866
2867                                         if (object->nDataChunks <= 0) {
2868                                                 /* remeber to clean up the object */
2869                                                 dev->gcCleanupList[cleanups] =
2870                                                     tags.objectId;
2871                                                 cleanups++;
2872                                         }
2873                                         markNAND = 0;
2874                                 } else if (0
2875                                            /* Todo object && object->deleted && object->nDataChunks == 0 */
2876                                            ) {
2877                                         /* Deleted object header with no data chunks.
2878                                          * Can be discarded and the file deleted.
2879                                          */
2880                                         object->chunkId = 0;
2881                                         yaffs_FreeTnode(object->myDev,
2882                                                         object->variant.
2883                                                         fileVariant.top);
2884                                         object->variant.fileVariant.top = NULL;
2885                                         yaffs_DoGenericObjectDeletion(object);
2886
2887                                 } else if (object) {
2888                                         /* It's either a data chunk in a live file or
2889                                          * an ObjectHeader, so we're interested in it.
2890                                          * NB Need to keep the ObjectHeaders of deleted files
2891                                          * until the whole file has been deleted off
2892                                          */
2893                                         tags.serialNumber++;
2894
2895                                         dev->nGCCopies++;
2896
2897                                         if (tags.chunkId == 0) {
2898                                                 /* It is an object Id,
2899                                                  * We need to nuke the shrinkheader flags first
2900                                                  * We no longer want the shrinkHeader flag since its work is done
2901                                                  * and if it is left in place it will mess up scanning.
2902                                                  * Also, clear out any shadowing stuff
2903                                                  */
2904
2905                                                 yaffs_ObjectHeader *oh;
2906                                                 oh = (yaffs_ObjectHeader *)buffer;
2907                                                 oh->isShrink = 0;
2908                                                 oh->shadowsObject = -1;
2909                                                 tags.extraShadows = 0;
2910                                                 tags.extraIsShrinkHeader = 0;
2911
2912                                                 yaffs_VerifyObjectHeader(object,oh,&tags,1);
2913                                         }
2914
2915                                         newChunk =
2916                                             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2917
2918                                         if (newChunk < 0) {
2919                                                 retVal = YAFFS_FAIL;
2920                                         } else {
2921
2922                                                 /* Ok, now fix up the Tnodes etc. */
2923
2924                                                 if (tags.chunkId == 0) {
2925                                                         /* It's a header */
2926                                                         object->chunkId =  newChunk;
2927                                                         object->serial =   tags.serialNumber;
2928                                                 } else {
2929                                                         /* It's a data chunk */
2930                                                         yaffs_PutChunkIntoFile
2931                                                             (object,
2932                                                              tags.chunkId,
2933                                                              newChunk, 0);
2934                                                 }
2935                                         }
2936                                 }
2937
2938                                 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2939
2940                         }
2941                 }
2942
2943                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2944
2945
2946                 /* Do any required cleanups */
2947                 for (i = 0; i < cleanups; i++) {
2948                         /* Time to delete the file too */
2949                         object =
2950                             yaffs_FindObjectByNumber(dev,
2951                                                      dev->gcCleanupList[i]);
2952                         if (object) {
2953                                 yaffs_FreeTnode(dev,
2954                                                 object->variant.fileVariant.
2955                                                 top);
2956                                 object->variant.fileVariant.top = NULL;
2957                                 T(YAFFS_TRACE_GC,
2958                                   (TSTR
2959                                    ("yaffs: About to finally delete object %d"
2960                                     TENDSTR), object->objectId));
2961                                 yaffs_DoGenericObjectDeletion(object);
2962                                 object->myDev->nDeletedFiles--;
2963                         }
2964
2965                 }
2966
2967         }
2968
2969         yaffs_VerifyCollectedBlock(dev,bi,block);
2970
2971         if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
2972                 T(YAFFS_TRACE_GC,
2973                   (TSTR
2974                    ("gc did not increase free chunks before %d after %d"
2975                     TENDSTR), chunksBefore, chunksAfter));
2976         }
2977
2978         dev->isDoingGC = 0;
2979
2980         return YAFFS_OK;
2981 }
2982
2983 /* New garbage collector
2984  * If we're very low on erased blocks then we do aggressive garbage collection
2985  * otherwise we do "leasurely" garbage collection.
2986  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2987  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2988  *
2989  * The idea is to help clear out space in a more spread-out manner.
2990  * Dunno if it really does anything useful.
2991  */
2992 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
2993 {
2994         int block;
2995         int aggressive;
2996         int gcOk = YAFFS_OK;
2997         int maxTries = 0;
2998
2999         int checkpointBlockAdjust;
3000
3001         if (dev->isDoingGC) {
3002                 /* Bail out so we don't get recursive gc */
3003                 return YAFFS_OK;
3004         }
3005
3006         /* This loop should pass the first time.
3007          * We'll only see looping here if the erase of the collected block fails.
3008          */
3009
3010         do {
3011                 maxTries++;
3012
3013                 checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
3014                 if(checkpointBlockAdjust < 0)
3015                         checkpointBlockAdjust = 0;
3016
3017                 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3018                         /* We need a block soon...*/
3019                         aggressive = 1;
3020                 } else {
3021                         /* We're in no hurry */
3022                         aggressive = 0;
3023                 }
3024
3025                 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3026
3027                 if (block > 0) {
3028                         dev->garbageCollections++;
3029                         if (!aggressive) {
3030                                 dev->passiveGarbageCollections++;
3031                         }
3032
3033                         T(YAFFS_TRACE_GC,
3034                           (TSTR
3035                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3036                            dev->nErasedBlocks, aggressive));
3037
3038                         gcOk = yaffs_GarbageCollectBlock(dev, block);
3039                 }
3040
3041                 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3042                         T(YAFFS_TRACE_GC,
3043                           (TSTR
3044                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3045                             TENDSTR), dev->nErasedBlocks, maxTries, block));
3046                 }
3047         } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
3048                  && (maxTries < 2));
3049
3050         return aggressive ? gcOk : YAFFS_OK;
3051 }
3052
3053 /*-------------------------  TAGS --------------------------------*/
3054
3055 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
3056                            int chunkInObject)
3057 {
3058         return (tags->chunkId == chunkInObject &&
3059                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3060
3061 }
3062
3063
3064 /*-------------------- Data file manipulation -----------------*/
3065
3066 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
3067                                  yaffs_ExtendedTags * tags)
3068 {
3069         /*Get the Tnode, then get the level 0 offset chunk offset */
3070         yaffs_Tnode *tn;
3071         int theChunk = -1;
3072         yaffs_ExtendedTags localTags;
3073         int retVal = -1;
3074
3075         yaffs_Device *dev = in->myDev;
3076
3077         if (!tags) {
3078                 /* Passed a NULL, so use our own tags space */
3079                 tags = &localTags;
3080         }
3081
3082         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3083
3084         if (tn) {
3085                 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3086
3087                 retVal =
3088                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3089                                            chunkInInode);
3090         }
3091         return retVal;
3092 }
3093
3094 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
3095                                           yaffs_ExtendedTags * tags)
3096 {
3097         /* Get the Tnode, then get the level 0 offset chunk offset */
3098         yaffs_Tnode *tn;
3099         int theChunk = -1;
3100         yaffs_ExtendedTags localTags;
3101
3102         yaffs_Device *dev = in->myDev;
3103         int retVal = -1;
3104
3105         if (!tags) {
3106                 /* Passed a NULL, so use our own tags space */
3107                 tags = &localTags;
3108         }
3109
3110         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3111
3112         if (tn) {
3113
3114                 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3115
3116                 retVal =
3117                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3118                                            chunkInInode);
3119
3120                 /* Delete the entry in the filestructure (if found) */
3121                 if (retVal != -1) {
3122                         yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
3123                 }
3124         } else {
3125                 /*T(("No level 0 found for %d\n", chunkInInode)); */
3126         }
3127
3128         if (retVal == -1) {
3129                 /* T(("Could not find %d to delete\n",chunkInInode)); */
3130         }
3131         return retVal;
3132 }
3133
3134 #ifdef YAFFS_PARANOID
3135
3136 static int yaffs_CheckFileSanity(yaffs_Object * in)
3137 {
3138         int chunk;
3139         int nChunks;
3140         int fSize;
3141         int failed = 0;
3142         int objId;
3143         yaffs_Tnode *tn;
3144         yaffs_Tags localTags;
3145         yaffs_Tags *tags = &localTags;
3146         int theChunk;
3147         int chunkDeleted;
3148
3149         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3150                 /* T(("Object not a file\n")); */
3151                 return YAFFS_FAIL;
3152         }
3153
3154         objId = in->objectId;
3155         fSize = in->variant.fileVariant.fileSize;
3156         nChunks =
3157             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3158
3159         for (chunk = 1; chunk <= nChunks; chunk++) {
3160                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3161                                            chunk);
3162
3163                 if (tn) {
3164
3165                         theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
3166
3167                         if (yaffs_CheckChunkBits
3168                             (dev, theChunk / dev->nChunksPerBlock,
3169                              theChunk % dev->nChunksPerBlock)) {
3170
3171                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3172                                                             tags,
3173                                                             &chunkDeleted);
3174                                 if (yaffs_TagsMatch
3175                                     (tags, in->objectId, chunk, chunkDeleted)) {
3176                                         /* found it; */
3177
3178                                 }
3179                         } else {
3180
3181                                 failed = 1;
3182                         }
3183
3184                 } else {
3185                         /* T(("No level 0 found for %d\n", chunk)); */
3186                 }
3187         }
3188
3189         return failed ? YAFFS_FAIL : YAFFS_OK;
3190 }
3191
3192 #endif
3193
3194 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
3195                                   int chunkInNAND, int inScan)
3196 {
3197         /* NB inScan is zero unless scanning.
3198          * For forward scanning, inScan is > 0;
3199          * for backward scanning inScan is < 0
3200          */
3201
3202         yaffs_Tnode *tn;
3203         yaffs_Device *dev = in->myDev;
3204         int existingChunk;
3205         yaffs_ExtendedTags existingTags;
3206         yaffs_ExtendedTags newTags;
3207         unsigned existingSerial, newSerial;
3208
3209         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3210                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3211                  * If it is not during Scanning then something went wrong!
3212                  */
3213                 if (!inScan) {
3214                         T(YAFFS_TRACE_ERROR,
3215                           (TSTR
3216                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3217                             TENDSTR)));
3218                         YBUG();
3219                 }
3220
3221                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3222                 return YAFFS_OK;
3223         }
3224
3225         tn = yaffs_AddOrFindLevel0Tnode(dev,
3226                                         &in->variant.fileVariant,
3227                                         chunkInInode,
3228                                         NULL);
3229         if (!tn) {
3230                 return YAFFS_FAIL;
3231         }
3232
3233         existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
3234
3235         if (inScan != 0) {
3236                 /* If we're scanning then we need to test for duplicates
3237                  * NB This does not need to be efficient since it should only ever
3238                  * happen when the power fails during a write, then only one
3239                  * chunk should ever be affected.
3240                  *
3241                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3242                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3243                  */
3244
3245                 if (existingChunk != 0) {
3246                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3247                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3248                          *
3249                          * We have a duplicate now we need to decide which one to use:
3250                          *
3251                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3252                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3253                          * YAFFS1: Get both sets of tags and compare serial numbers.
3254                          */
3255
3256                         if (inScan > 0) {
3257                                 /* Only do this for forward scanning */
3258                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3259                                                                 chunkInNAND,
3260                                                                 NULL, &newTags);
3261
3262                                 /* Do a proper find */
3263                                 existingChunk =
3264                                     yaffs_FindChunkInFile(in, chunkInInode,
3265                                                           &existingTags);
3266                         }
3267
3268                         if (existingChunk <= 0) {
3269                                 /*Hoosterman - how did this happen? */
3270
3271                                 T(YAFFS_TRACE_ERROR,
3272                                   (TSTR
3273                                    ("yaffs tragedy: existing chunk < 0 in scan"
3274                                     TENDSTR)));
3275
3276                         }
3277
3278                         /* NB The deleted flags should be false, otherwise the chunks will
3279                          * not be loaded during a scan
3280                          */
3281
3282                         newSerial = newTags.serialNumber;
3283                         existingSerial = existingTags.serialNumber;
3284
3285                         if ((inScan > 0) &&
3286                             (in->myDev->isYaffs2 ||
3287                              existingChunk <= 0 ||
3288                              ((existingSerial + 1) & 3) == newSerial)) {
3289                                 /* Forward scanning.
3290                                  * Use new
3291                                  * Delete the old one and drop through to update the tnode
3292                                  */
3293                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3294                                                   __LINE__);
3295                         } else {
3296                                 /* Backward scanning or we want to use the existing one
3297                                  * Use existing.
3298                                  * Delete the new one and return early so that the tnode isn't changed
3299                                  */
3300                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3301                                                   __LINE__);
3302                                 return YAFFS_OK;
3303                         }
3304                 }
3305
3306         }
3307
3308         if (existingChunk == 0) {
3309                 in->nDataChunks++;
3310         }
3311
3312         yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
3313
3314         return YAFFS_OK;
3315 }
3316
3317 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
3318                                          __u8 * buffer)
3319 {
3320         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3321
3322         if (chunkInNAND >= 0) {
3323                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3324                                                        buffer,NULL);
3325         } else {
3326                 T(YAFFS_TRACE_NANDACCESS,
3327                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3328                    chunkInNAND));
3329                 /* get sane (zero) data if you read a hole */
3330                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3331                 return 0;
3332         }
3333
3334 }
3335
3336 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
3337 {
3338         int block;
3339         int page;
3340         yaffs_ExtendedTags tags;
3341         yaffs_BlockInfo *bi;
3342
3343         if (chunkId <= 0)
3344                 return;
3345
3346
3347         dev->nDeletions++;
3348         block = chunkId / dev->nChunksPerBlock;
3349         page = chunkId % dev->nChunksPerBlock;
3350
3351
3352         if(!yaffs_CheckChunkBit(dev,block,page))
3353                 T(YAFFS_TRACE_VERIFY,
3354                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3355                          chunkId));
3356
3357         bi = yaffs_GetBlockInfo(dev, block);
3358
3359         T(YAFFS_TRACE_DELETION,
3360           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3361
3362         if (markNAND &&
3363             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3364
3365                 yaffs_InitialiseTags(&tags);
3366
3367                 tags.chunkDeleted = 1;
3368
3369                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3370                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3371         } else {
3372                 dev->nUnmarkedDeletions++;
3373         }
3374
3375         /* Pull out of the management area.
3376          * If the whole block became dirty, this will kick off an erasure.
3377          */
3378         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3379             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3380             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3381             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3382                 dev->nFreeChunks++;
3383
3384                 yaffs_ClearChunkBit(dev, block, page);
3385
3386                 bi->pagesInUse--;
3387
3388                 if (bi->pagesInUse == 0 &&
3389                     !bi->hasShrinkHeader &&
3390                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3391                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3392                         yaffs_BlockBecameDirty(dev, block);
3393                 }
3394
3395         } else {
3396                 /* T(("Bad news deleting chunk %d\n",chunkId)); */
3397         }
3398
3399 }
3400
3401 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
3402                                         const __u8 * buffer, int nBytes,
3403                                         int useReserve)
3404 {
3405         /* Find old chunk Need to do this to get serial number
3406          * Write new one and patch into tree.
3407          * Invalidate old tags.
3408          */
3409
3410         int prevChunkId;
3411         yaffs_ExtendedTags prevTags;
3412
3413         int newChunkId;
3414         yaffs_ExtendedTags newTags;
3415
3416         yaffs_Device *dev = in->myDev;
3417
3418         yaffs_CheckGarbageCollection(dev);
3419
3420         /* Get the previous chunk at this location in the file if it exists */
3421         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3422
3423         /* Set up new tags */
3424         yaffs_InitialiseTags(&newTags);
3425
3426         newTags.chunkId = chunkInInode;
3427         newTags.objectId = in->objectId;
3428         newTags.serialNumber =
3429             (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3430         newTags.byteCount = nBytes;
3431
3432         newChunkId =
3433             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3434                                               useReserve);
3435
3436         if (newChunkId >= 0) {
3437                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3438
3439                 if (prevChunkId >= 0) {
3440                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3441
3442                 }
3443
3444                 yaffs_CheckFileSanity(in);
3445         }
3446         return newChunkId;
3447
3448 }
3449
3450 /* UpdateObjectHeader updates the header on NAND for an object.
3451  * If name is not NULL, then that new name is used.
3452  */
3453 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
3454                              int isShrink, int shadows)
3455 {
3456
3457         yaffs_BlockInfo *bi;
3458
3459         yaffs_Device *dev = in->myDev;
3460
3461         int prevChunkId;
3462         int retVal = 0;
3463         int result = 0;
3464
3465         int newChunkId;
3466         yaffs_ExtendedTags newTags;
3467         yaffs_ExtendedTags oldTags;
3468
3469         __u8 *buffer = NULL;
3470         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3471
3472         yaffs_ObjectHeader *oh = NULL;
3473
3474         yaffs_strcpy(oldName,"silly old name");
3475
3476         if (!in->fake || force) {
3477
3478                 yaffs_CheckGarbageCollection(dev);
3479                 yaffs_CheckObjectDetailsLoaded(in);
3480
3481                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3482                 oh = (yaffs_ObjectHeader *) buffer;
3483
3484                 prevChunkId = in->chunkId;
3485
3486                 if (prevChunkId >= 0) {
3487                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3488                                                         buffer, &oldTags);
3489
3490                         yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
3491
3492                         memcpy(oldName, oh->name, sizeof(oh->name));
3493                 }
3494
3495                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3496
3497                 oh->type = in->variantType;
3498                 oh->yst_mode = in->yst_mode;
3499                 oh->shadowsObject = shadows;
3500
3501 #ifdef CONFIG_YAFFS_WINCE
3502                 oh->win_atime[0] = in->win_atime[0];
3503                 oh->win_ctime[0] = in->win_ctime[0];
3504                 oh->win_mtime[0] = in->win_mtime[0];
3505                 oh->win_atime[1] = in->win_atime[1];
3506                 oh->win_ctime[1] = in->win_ctime[1];
3507                 oh->win_mtime[1] = in->win_mtime[1];
3508 #else
3509                 oh->yst_uid = in->yst_uid;
3510                 oh->yst_gid = in->yst_gid;
3511                 oh->yst_atime = in->yst_atime;
3512                 oh->yst_mtime = in->yst_mtime;
3513                 oh->yst_ctime = in->yst_ctime;
3514                 oh->yst_rdev = in->yst_rdev;
3515 #endif
3516                 if (in->parent) {
3517                         oh->parentObjectId = in->parent->objectId;
3518                 } else {
3519                         oh->parentObjectId = 0;
3520                 }
3521
3522                 if (name && *name) {
3523                         memset(oh->name, 0, sizeof(oh->name));
3524                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3525                 } else if (prevChunkId>=0) {
3526                         memcpy(oh->name, oldName, sizeof(oh->name));
3527                 } else {
3528                         memset(oh->name, 0, sizeof(oh->name));
3529                 }
3530
3531                 oh->isShrink = isShrink;
3532
3533                 switch (in->variantType) {
3534                 case YAFFS_OBJECT_TYPE_UNKNOWN:
3535                         /* Should not happen */
3536                         break;
3537                 case YAFFS_OBJECT_TYPE_FILE:
3538                         oh->fileSize =
3539                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3540                              || oh->parentObjectId ==
3541                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3542                             fileVariant.fileSize;
3543                         break;
3544                 case YAFFS_OBJECT_TYPE_HARDLINK:
3545                         oh->equivalentObjectId =
3546                             in->variant.hardLinkVariant.equivalentObjectId;
3547                         break;
3548                 case YAFFS_OBJECT_TYPE_SPECIAL:
3549                         /* Do nothing */
3550                         break;
3551                 case YAFFS_OBJECT_TYPE_DIRECTORY:
3552                         /* Do nothing */
3553                         break;
3554                 case YAFFS_OBJECT_TYPE_SYMLINK:
3555                         yaffs_strncpy(oh->alias,
3556                                       in->variant.symLinkVariant.alias,
3557                                       YAFFS_MAX_ALIAS_LENGTH);
3558                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3559                         break;
3560                 }
3561
3562                 /* Tags */
3563                 yaffs_InitialiseTags(&newTags);
3564                 in->serial++;
3565                 newTags.chunkId = 0;
3566                 newTags.objectId = in->objectId;
3567                 newTags.serialNumber = in->serial;
3568
3569                 /* Add extra info for file header */
3570
3571                 newTags.extraHeaderInfoAvailable = 1;
3572                 newTags.extraParentObjectId = oh->parentObjectId;
3573                 newTags.extraFileLength = oh->fileSize;
3574                 newTags.extraIsShrinkHeader = oh->isShrink;
3575                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3576                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3577                 newTags.extraObjectType = in->variantType;
3578
3579                 yaffs_VerifyObjectHeader(in,oh,&newTags,1);
3580
3581                 /* Create new chunk in NAND */
3582                 newChunkId =
3583                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3584                                                       (prevChunkId >= 0) ? 1 : 0);
3585
3586                 if (newChunkId >= 0) {
3587
3588                         in->chunkId = newChunkId;
3589
3590                         if (prevChunkId >= 0) {
3591                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
3592                                                   __LINE__);
3593                         }
3594
3595                         if(!yaffs_ObjectHasCachedWriteData(in))
3596                                 in->dirty = 0;
3597
3598                         /* If this was a shrink, then mark the block that the chunk lives on */
3599                         if (isShrink) {
3600                                 bi = yaffs_GetBlockInfo(in->myDev,
3601                                                         newChunkId /in->myDev-> nChunksPerBlock);
3602                                 bi->hasShrinkHeader = 1;
3603                         }
3604
3605                 }
3606
3607                 retVal = newChunkId;
3608
3609         }
3610
3611         if (buffer)
3612                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3613
3614         return retVal;
3615 }
3616
3617 /*------------------------ Short Operations Cache ----------------------------------------
3618  *   In many situations where there is no high level buffering (eg WinCE) a lot of
3619  *   reads might be short sequential reads, and a lot of writes may be short
3620  *   sequential writes. eg. scanning/writing a jpeg file.
3621  *   In these cases, a short read/write cache can provide a huge perfomance benefit
3622  *   with dumb-as-a-rock code.
3623  *   In Linux, the page cache provides read buffering aand the short op cache provides write
3624  *   buffering.
3625  *
3626  *   There are a limited number (~10) of cache chunks per device so that we don't
3627  *   need a very intelligent search.
3628  */
3629
3630 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3631 {
3632         yaffs_Device *dev = obj->myDev;
3633         int i;
3634         yaffs_ChunkCache *cache;
3635         int nCaches = obj->myDev->nShortOpCaches;
3636
3637         for(i = 0; i < nCaches; i++){
3638                 cache = &dev->srCache[i];
3639                 if (cache->object == obj &&
3640                     cache->dirty)
3641                         return 1;
3642         }
3643
3644         return 0;
3645 }
3646
3647
3648 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
3649 {
3650         yaffs_Device *dev = obj->myDev;
3651         int lowest = -99;       /* Stop compiler whining. */
3652         int i;
3653         yaffs_ChunkCache *cache;
3654         int chunkWritten = 0;
3655         int nCaches = obj->myDev->nShortOpCaches;
3656
3657         if (nCaches > 0) {
3658                 do {
3659                         cache = NULL;
3660
3661                         /* Find the dirty cache for this object with the lowest chunk id. */
3662                         for (i = 0; i < nCaches; i++) {
3663                                 if (dev->srCache[i].object == obj &&
3664                                     dev->srCache[i].dirty) {
3665                                         if (!cache
3666                                             || dev->srCache[i].chunkId <
3667                                             lowest) {
3668                                                 cache = &dev->srCache[i];
3669                                                 lowest = cache->chunkId;
3670                                         }
3671                                 }
3672                         }
3673
3674                         if (cache && !cache->locked) {
3675                                 /* Write it out and free it up */
3676
3677                                 chunkWritten =
3678                                     yaffs_WriteChunkDataToObject(cache->object,
3679                                                                  cache->chunkId,
3680                                                                  cache->data,
3681                                                                  cache->nBytes,
3682                                                                  1);
3683                                 cache->dirty = 0;
3684                                 cache->object = NULL;
3685                         }
3686
3687                 } while (cache && chunkWritten > 0);
3688
3689                 if (cache) {
3690                         /* Hoosterman, disk full while writing cache out. */
3691                         T(YAFFS_TRACE_ERROR,
3692                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3693
3694                 }
3695         }
3696
3697 }
3698
3699 /*yaffs_FlushEntireDeviceCache(dev)
3700  *
3701  *
3702  */
3703
3704 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3705 {
3706         yaffs_Object *obj;
3707         int nCaches = dev->nShortOpCaches;
3708         int i;
3709
3710         /* Find a dirty object in the cache and flush it...
3711          * until there are no further dirty objects.
3712          */
3713         do {
3714                 obj = NULL;
3715                 for( i = 0; i < nCaches && !obj; i++) {
3716                         if (dev->srCache[i].object &&
3717                             dev->srCache[i].dirty)
3718                                 obj = dev->srCache[i].object;
3719
3720                 }
3721                 if(obj)
3722                         yaffs_FlushFilesChunkCache(obj);
3723
3724         } while(obj);
3725
3726 }
3727
3728
3729 /* Grab us a cache chunk for use.
3730  * First look for an empty one.
3731  * Then look for the least recently used non-dirty one.
3732  * Then look for the least recently used dirty one...., flush and look again.
3733  */
3734 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3735 {
3736         int i;
3737         int usage;
3738         int theOne;
3739
3740         if (dev->nShortOpCaches > 0) {
3741                 for (i = 0; i < dev->nShortOpCaches; i++) {
3742                         if (!dev->srCache[i].object)
3743                                 return &dev->srCache[i];
3744                 }
3745
3746                 return NULL;
3747
3748                 theOne = -1;
3749                 usage = 0;      /* just to stop the compiler grizzling */
3750
3751                 for (i = 0; i < dev->nShortOpCaches; i++) {
3752                         if (!dev->srCache[i].dirty &&
3753                             ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3754                              theOne < 0)) {
3755                                 usage = dev->srCache[i].lastUse;
3756                                 theOne = i;
3757                         }
3758                 }
3759
3760
3761                 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3762         } else {
3763                 return NULL;
3764         }
3765
3766 }
3767
3768 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3769 {
3770         yaffs_ChunkCache *cache;
3771         yaffs_Object *theObj;
3772         int usage;
3773         int i;
3774         int pushout;
3775
3776         if (dev->nShortOpCaches > 0) {
3777                 /* Try find a non-dirty one... */
3778
3779                 cache = yaffs_GrabChunkCacheWorker(dev);
3780
3781                 if (!cache) {
3782                         /* They were all dirty, find the last recently used object and flush
3783                          * its cache, then  find again.
3784                          * NB what's here is not very accurate, we actually flush the object
3785                          * the last recently used page.
3786                          */
3787
3788                         /* With locking we can't assume we can use entry zero */
3789
3790                         theObj = NULL;
3791                         usage = -1;
3792                         cache = NULL;
3793                         pushout = -1;
3794
3795                         for (i = 0; i < dev->nShortOpCaches; i++) {
3796                                 if (dev->srCache[i].object &&
3797                                     !dev->srCache[i].locked &&
3798                                     (dev->srCache[i].lastUse < usage || !cache))
3799                                 {
3800                                         usage = dev->srCache[i].lastUse;
3801                                         theObj = dev->srCache[i].object;
3802                                         cache = &dev->srCache[i];
3803                                         pushout = i;
3804                                 }
3805                         }
3806
3807                         if (!cache || cache->dirty) {
3808                                 /* Flush and try again */
3809                                 yaffs_FlushFilesChunkCache(theObj);
3810                                 cache = yaffs_GrabChunkCacheWorker(dev);
3811                         }
3812
3813                 }
3814                 return cache;
3815         } else
3816                 return NULL;
3817
3818 }
3819
3820 /* Find a cached chunk */
3821 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3822                                               int chunkId)
3823 {
3824         yaffs_Device *dev = obj->myDev;
3825         int i;
3826         if (dev->nShortOpCaches > 0) {
3827                 for (i = 0; i < dev->nShortOpCaches; i++) {
3828                         if (dev->srCache[i].object == obj &&
3829                             dev->srCache[i].chunkId == chunkId) {
3830                                 dev->cacheHits++;
3831
3832                                 return &dev->srCache[i];
3833                         }
3834                 }
3835         }
3836         return NULL;
3837 }
3838
3839 /* Mark the chunk for the least recently used algorithym */
3840 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3841                                 int isAWrite)
3842 {
3843
3844         if (dev->nShortOpCaches > 0) {
3845                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3846                         /* Reset the cache usages */
3847                         int i;
3848                         for (i = 1; i < dev->nShortOpCaches; i++) {
3849                                 dev->srCache[i].lastUse = 0;
3850                         }
3851                         dev->srLastUse = 0;
3852                 }
3853
3854                 dev->srLastUse++;
3855
3856                 cache->lastUse = dev->srLastUse;
3857
3858                 if (isAWrite) {
3859                         cache->dirty = 1;
3860                 }
3861         }
3862 }
3863
3864 /* Invalidate a single cache page.
3865  * Do this when a whole page gets written,
3866  * ie the short cache for this page is no longer valid.
3867  */
3868 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
3869 {
3870         if (object->myDev->nShortOpCaches > 0) {
3871                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3872
3873                 if (cache) {
3874                         cache->object = NULL;
3875                 }
3876         }
3877 }
3878
3879 /* Invalidate all the cache pages associated with this object
3880  * Do this whenever ther file is deleted or resized.
3881  */
3882 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
3883 {
3884         int i;
3885         yaffs_Device *dev = in->myDev;
3886
3887         if (dev->nShortOpCaches > 0) {
3888                 /* Invalidate it. */
3889                 for (i = 0; i < dev->nShortOpCaches; i++) {
3890                         if (dev->srCache[i].object == in) {
3891                                 dev->srCache[i].object = NULL;
3892                         }
3893                 }
3894         }
3895 }
3896
3897 /*--------------------- Checkpointing --------------------*/
3898
3899
3900 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
3901 {
3902         yaffs_CheckpointValidity cp;
3903
3904         memset(&cp,0,sizeof(cp));
3905
3906         cp.structType = sizeof(cp);
3907         cp.magic = YAFFS_MAGIC;
3908         cp.version = YAFFS_CHECKPOINT_VERSION;
3909         cp.head = (head) ? 1 : 0;
3910
3911         return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
3912                 1 : 0;
3913 }
3914
3915 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
3916 {
3917         yaffs_CheckpointValidity cp;
3918         int ok;
3919
3920         ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3921
3922         if(ok)
3923                 ok = (cp.structType == sizeof(cp)) &&
3924                      (cp.magic == YAFFS_MAGIC) &&
3925                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
3926                      (cp.head == ((head) ? 1 : 0));
3927         return ok ? 1 : 0;
3928 }
3929
3930 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
3931                                            yaffs_Device *dev)
3932 {
3933         cp->nErasedBlocks = dev->nErasedBlocks;
3934         cp->allocationBlock = dev->allocationBlock;
3935         cp->allocationPage = dev->allocationPage;
3936         cp->nFreeChunks = dev->nFreeChunks;
3937
3938         cp->nDeletedFiles = dev->nDeletedFiles;
3939         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
3940         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
3941         cp->sequenceNumber = dev->sequenceNumber;
3942         cp->oldestDirtySequence = dev->oldestDirtySequence;
3943
3944 }
3945
3946 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
3947                                            yaffs_CheckpointDevice *cp)
3948 {
3949         dev->nErasedBlocks = cp->nErasedBlocks;
3950         dev->allocationBlock = cp->allocationBlock;
3951         dev->allocationPage = cp->allocationPage;
3952         dev->nFreeChunks = cp->nFreeChunks;
3953
3954         dev->nDeletedFiles = cp->nDeletedFiles;
3955         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
3956         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
3957         dev->sequenceNumber = cp->sequenceNumber;
3958         dev->oldestDirtySequence = cp->oldestDirtySequence;
3959 }
3960
3961
3962 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
3963 {
3964         yaffs_CheckpointDevice cp;
3965         __u32 nBytes;
3966         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3967
3968         int ok;
3969
3970         /* Write device runtime values*/
3971         yaffs_DeviceToCheckpointDevice(&cp,dev);
3972         cp.structType = sizeof(cp);
3973
3974         ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3975
3976         /* Write block info */
3977         if(ok) {
3978                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3979                 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
3980         }
3981
3982         /* Write chunk bits */
3983         if(ok) {
3984                 nBytes = nBlocks * dev->chunkBitmapStride;
3985                 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
3986         }
3987         return   ok ? 1 : 0;
3988
3989 }
3990
3991 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
3992 {
3993         yaffs_CheckpointDevice cp;
3994         __u32 nBytes;
3995         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3996
3997         int ok;
3998
3999         ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4000         if(!ok)
4001                 return 0;
4002
4003         if(cp.structType != sizeof(cp))
4004                 return 0;
4005
4006
4007         yaffs_CheckpointDeviceToDevice(dev,&cp);
4008
4009         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4010
4011         ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
4012
4013         if(!ok)
4014                 return 0;
4015         nBytes = nBlocks * dev->chunkBitmapStride;
4016
4017         ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
4018
4019         return ok ? 1 : 0;
4020 }
4021
4022 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4023                                            yaffs_Object *obj)
4024 {
4025
4026         cp->objectId = obj->objectId;
4027         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4028         cp->chunkId = obj->chunkId;
4029         cp->variantType = obj->variantType;
4030         cp->deleted = obj->deleted;
4031         cp->softDeleted = obj->softDeleted;
4032         cp->unlinked = obj->unlinked;
4033         cp->fake = obj->fake;
4034         cp->renameAllowed = obj->renameAllowed;
4035         cp->unlinkAllowed = obj->unlinkAllowed;
4036         cp->serial = obj->serial;
4037         cp->nDataChunks = obj->nDataChunks;
4038
4039         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4040                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4041         else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4042                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4043 }
4044
4045 static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
4046 {
4047
4048         yaffs_Object *parent;
4049
4050         obj->objectId = cp->objectId;
4051
4052         if(cp->parentId)
4053                 parent = yaffs_FindOrCreateObjectByNumber(
4054                                         obj->myDev,
4055                                         cp->parentId,
4056                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4057         else
4058                 parent = NULL;
4059
4060         if(parent)
4061                 yaffs_AddObjectToDirectory(parent, obj);
4062
4063         obj->chunkId = cp->chunkId;
4064         obj->variantType = cp->variantType;
4065         obj->deleted = cp->deleted;
4066         obj->softDeleted = cp->softDeleted;
4067         obj->unlinked = cp->unlinked;
4068         obj->fake = cp->fake;
4069         obj->renameAllowed = cp->renameAllowed;
4070         obj->unlinkAllowed = cp->unlinkAllowed;
4071         obj->serial = cp->serial;
4072         obj->nDataChunks = cp->nDataChunks;
4073
4074         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4075                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4076         else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4077                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4078
4079         if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
4080                 obj->lazyLoaded = 1;
4081 }
4082
4083
4084
4085 static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
4086                                         __u32 level, int chunkOffset)
4087 {
4088         int i;
4089         yaffs_Device *dev = in->myDev;
4090         int ok = 1;
4091         int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4092
4093         if (tn) {
4094                 if (level > 0) {
4095
4096                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
4097                                 if (tn->internal[i]) {
4098                                         ok = yaffs_CheckpointTnodeWorker(in,
4099                                                         tn->internal[i],
4100                                                         level - 1,
4101                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4102                                 }
4103                         }
4104                 } else if (level == 0) {
4105                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4106                         /* printf("write tnode at %d\n",baseOffset); */
4107                         ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
4108                         if(ok)
4109                                 ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
4110                 }
4111         }
4112
4113         return ok;
4114
4115 }
4116
4117 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4118 {
4119         __u32 endMarker = ~0;
4120         int ok = 1;
4121
4122         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4123                 ok = yaffs_CheckpointTnodeWorker(obj,
4124                                             obj->variant.fileVariant.top,
4125                                             obj->variant.fileVariant.topLevel,
4126                                             0);
4127                 if(ok)
4128                         ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
4129                                 sizeof(endMarker));
4130         }
4131
4132         return ok ? 1 : 0;
4133 }
4134
4135 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4136 {
4137         __u32 baseChunk;
4138         int ok = 1;
4139         yaffs_Device *dev = obj->myDev;
4140         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4141         yaffs_Tnode *tn;
4142         int nread = 0;
4143
4144         ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4145
4146         while(ok && (~baseChunk)){
4147                 nread++;
4148                 /* Read level 0 tnode */
4149
4150
4151                 /* printf("read  tnode at %d\n",baseChunk); */
4152                 tn = yaffs_GetTnodeRaw(dev);
4153                 if(tn)
4154                         ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
4155                               (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
4156                 else
4157                         ok = 0;
4158
4159                 if(tn && ok){
4160                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4161                                                         fileStructPtr,
4162                                                         baseChunk,
4163                                                         tn) ? 1 : 0;
4164
4165                 }
4166
4167                 if(ok)
4168                         ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
4169
4170         }
4171
4172         T(YAFFS_TRACE_CHECKPOINT,(
4173                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4174                 nread,baseChunk,ok));
4175
4176         return ok ? 1 : 0;
4177 }
4178
4179
4180 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4181 {
4182         yaffs_Object *obj;
4183         yaffs_CheckpointObject cp;
4184         int i;
4185         int ok = 1;
4186         struct list_head *lh;
4187
4188
4189         /* Iterate through the objects in each hash entry,
4190          * dumping them to the checkpointing stream.
4191          */
4192
4193          for(i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++){
4194                 list_for_each(lh, &dev->objectBucket[i].list) {
4195                         if (lh) {
4196                                 obj = list_entry(lh, yaffs_Object, hashLink);
4197                                 if (!obj->deferedFree) {
4198                                         yaffs_ObjectToCheckpointObject(&cp,obj);
4199                                         cp.structType = sizeof(cp);
4200
4201                                         T(YAFFS_TRACE_CHECKPOINT,(
4202                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4203                                                 cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
4204
4205                                         ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4206
4207                                         if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
4208                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4209                                         }
4210                                 }
4211                         }
4212                 }
4213          }
4214
4215          /* Dump end of list */
4216         memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
4217         cp.structType = sizeof(cp);
4218
4219         if(ok)
4220                 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
4221
4222         return ok ? 1 : 0;
4223 }
4224
4225 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4226 {
4227         yaffs_Object *obj;
4228         yaffs_CheckpointObject cp;
4229         int ok = 1;
4230         int done = 0;
4231         yaffs_Object *hardList = NULL;
4232
4233         while(ok && !done) {
4234                 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
4235                 if(cp.structType != sizeof(cp)) {
4236                         T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
4237                                 cp.structType,sizeof(cp),ok));
4238                         ok = 0;
4239                 }
4240
4241                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4242                         cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
4243
4244                 if(ok && cp.objectId == ~0)
4245                         done = 1;
4246                 else if(ok){
4247                         obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
4248                         if(obj) {
4249                                 yaffs_CheckpointObjectToObject(obj,&cp);
4250                                 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4251                                         ok = yaffs_ReadCheckpointTnodes(obj);
4252                                 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4253                                         obj->hardLinks.next =
4254                                                     (struct list_head *)
4255                                                     hardList;
4256                                         hardList = obj;
4257                                 }
4258
4259                         }
4260                 }
4261         }
4262
4263         if(ok)
4264                 yaffs_HardlinkFixup(dev,hardList);
4265
4266         return ok ? 1 : 0;
4267 }
4268
4269 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4270 {
4271         __u32 checkpointSum;
4272         int ok;
4273
4274         yaffs_GetCheckpointSum(dev,&checkpointSum);
4275
4276         ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
4277
4278         if(!ok)
4279                 return 0;
4280
4281         return 1;
4282 }
4283
4284 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4285 {
4286         __u32 checkpointSum0;
4287         __u32 checkpointSum1;
4288         int ok;
4289
4290         yaffs_GetCheckpointSum(dev,&checkpointSum0);
4291
4292         ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4293
4294         if(!ok)
4295                 return 0;
4296
4297         if(checkpointSum0 != checkpointSum1)
4298                 return 0;
4299
4300         return 1;
4301 }
4302
4303
4304 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4305 {
4306
4307         int ok = 1;
4308
4309         if(dev->skipCheckpointWrite || !dev->isYaffs2){
4310                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
4311                 ok = 0;
4312         }
4313
4314         if(ok)
4315                 ok = yaffs_CheckpointOpen(dev,1);
4316
4317         if(ok){
4318                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4319                 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
4320         }
4321         if(ok){
4322                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
4323                 ok = yaffs_WriteCheckpointDevice(dev);
4324         }
4325         if(ok){
4326                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
4327                 ok = yaffs_WriteCheckpointObjects(dev);
4328         }
4329         if(ok){
4330                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
4331                 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
4332         }
4333
4334         if(ok){
4335                 ok = yaffs_WriteCheckpointSum(dev);
4336         }
4337
4338
4339         if(!yaffs_CheckpointClose(dev))
4340                  ok = 0;
4341
4342         if(ok)
4343                 dev->isCheckpointed = 1;
4344          else
4345                 dev->isCheckpointed = 0;
4346
4347         return dev->isCheckpointed;
4348 }
4349
4350 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4351 {
4352         int ok = 1;
4353
4354         if(dev->skipCheckpointRead || !dev->isYaffs2){
4355                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
4356                 ok = 0;
4357         }
4358
4359         if(ok)
4360                 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
4361
4362         if(ok){
4363                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4364                 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
4365         }
4366         if(ok){
4367                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
4368                 ok = yaffs_ReadCheckpointDevice(dev);
4369         }
4370         if(ok){
4371                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
4372                 ok = yaffs_ReadCheckpointObjects(dev);
4373         }
4374         if(ok){
4375                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
4376                 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
4377         }
4378
4379         if(ok){
4380                 ok = yaffs_ReadCheckpointSum(dev);
4381                 T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
4382         }
4383
4384         if(!yaffs_CheckpointClose(dev))
4385                 ok = 0;
4386
4387         if(ok)
4388                 dev->isCheckpointed = 1;
4389          else
4390                 dev->isCheckpointed = 0;
4391
4392         return ok ? 1 : 0;
4393
4394 }
4395
4396 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4397 {
4398         if(dev->isCheckpointed ||
4399            dev->blocksInCheckpoint > 0){
4400                 dev->isCheckpointed = 0;
4401                 yaffs_CheckpointInvalidateStream(dev);
4402                 if(dev->superBlock && dev->markSuperBlockDirty)
4403                         dev->markSuperBlockDirty(dev->superBlock);
4404         }
4405 }
4406
4407
4408 int yaffs_CheckpointSave(yaffs_Device *dev)
4409 {
4410
4411         T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4412
4413         yaffs_VerifyObjects(dev);
4414         yaffs_VerifyBlocks(dev);
4415         yaffs_VerifyFreeChunks(dev);
4416
4417         if(!dev->isCheckpointed) {
4418                 yaffs_InvalidateCheckpoint(dev);
4419                 yaffs_WriteCheckpointData(dev);
4420         }
4421
4422         T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4423
4424         return dev->isCheckpointed;
4425 }
4426
4427 int yaffs_CheckpointRestore(yaffs_Device *dev)
4428 {
4429         int retval;
4430         T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4431
4432         retval = yaffs_ReadCheckpointData(dev);
4433
4434         if(dev->isCheckpointed){
4435                 yaffs_VerifyObjects(dev);
4436                 yaffs_VerifyBlocks(dev);
4437                 yaffs_VerifyFreeChunks(dev);
4438         }
4439
4440         T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
4441
4442         return retval;
4443 }
4444
4445 /*--------------------- File read/write ------------------------
4446  * Read and write have very similar structures.
4447  * In general the read/write has three parts to it
4448  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4449  * Some complete chunks
4450  * An incomplete chunk to end off with
4451  *
4452  * Curve-balls: the first chunk might also be the last chunk.
4453  */
4454
4455 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
4456                            int nBytes)
4457 {
4458
4459         __u32 chunk = 0;
4460         __u32 start = 0;
4461         int nToCopy;
4462         int n = nBytes;
4463         int nDone = 0;
4464         yaffs_ChunkCache *cache;
4465
4466         yaffs_Device *dev;
4467
4468         dev = in->myDev;
4469
4470         while (n > 0) {
4471                 //chunk = offset / dev->nDataBytesPerChunk + 1;
4472                 //start = offset % dev->nDataBytesPerChunk;
4473                 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4474                 chunk++;
4475
4476                 /* OK now check for the curveball where the start and end are in
4477                  * the same chunk.
4478                  */
4479                 if ((start + n) < dev->nDataBytesPerChunk) {
4480                         nToCopy = n;
4481                 } else {
4482                         nToCopy = dev->nDataBytesPerChunk - start;
4483                 }
4484
4485                 cache = yaffs_FindChunkCache(in, chunk);
4486
4487                 /* If the chunk is already in the cache or it is less than a whole chunk
4488                  * then use the cache (if there is caching)
4489                  * else bypass the cache.
4490                  */
4491                 if (cache || nToCopy != dev->nDataBytesPerChunk) {
4492                         if (dev->nShortOpCaches > 0) {
4493
4494                                 /* If we can't find the data in the cache, then load it up. */
4495
4496                                 if (!cache) {
4497                                         cache = yaffs_GrabChunkCache(in->myDev);
4498                                         cache->object = in;
4499                                         cache->chunkId = chunk;
4500                                         cache->dirty = 0;
4501                                         cache->locked = 0;
4502                                         yaffs_ReadChunkDataFromObject(in, chunk,
4503                                                                       cache->
4504                                                                       data);
4505                                         cache->nBytes = 0;
4506                                 }
4507
4508                                 yaffs_UseChunkCache(dev, cache, 0);
4509
4510                                 cache->locked = 1;
4511
4512 #ifdef CONFIG_YAFFS_WINCE
4513                                 yfsd_UnlockYAFFS(TRUE);
4514 #endif
4515                                 memcpy(buffer, &cache->data[start], nToCopy);
4516
4517 #ifdef CONFIG_YAFFS_WINCE
4518                                 yfsd_LockYAFFS(TRUE);
4519 #endif
4520                                 cache->locked = 0;
4521                         } else {
4522                                 /* Read into the local buffer then copy..*/
4523
4524                                 __u8 *localBuffer =
4525                                     yaffs_GetTempBuffer(dev, __LINE__);
4526                                 yaffs_ReadChunkDataFromObject(in, chunk,
4527                                                               localBuffer);
4528 #ifdef CONFIG_YAFFS_WINCE
4529                                 yfsd_UnlockYAFFS(TRUE);
4530 #endif
4531                                 memcpy(buffer, &localBuffer[start], nToCopy);
4532
4533 #ifdef CONFIG_YAFFS_WINCE
4534                                 yfsd_LockYAFFS(TRUE);
4535 #endif
4536                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4537                                                         __LINE__);
4538                         }
4539
4540                 } else {
4541 #ifdef CONFIG_YAFFS_WINCE
4542                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4543
4544                         /* Under WinCE can't do direct transfer. Need to use a local buffer.
4545                          * This is because we otherwise screw up WinCE's memory mapper
4546                          */
4547                         yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
4548
4549 #ifdef CONFIG_YAFFS_WINCE
4550                         yfsd_UnlockYAFFS(TRUE);
4551 #endif
4552                         memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
4553
4554 #ifdef CONFIG_YAFFS_WINCE
4555                         yfsd_LockYAFFS(TRUE);
4556                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4557 #endif
4558
4559 #else
4560                         /* A full chunk. Read directly into the supplied buffer. */
4561                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4562 #endif
4563                 }
4564
4565                 n -= nToCopy;
4566                 offset += nToCopy;
4567                 buffer += nToCopy;
4568                 nDone += nToCopy;
4569
4570         }
4571
4572         return nDone;
4573 }
4574
4575 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
4576                           int nBytes, int writeThrough)
4577 {
4578
4579         __u32 chunk = 0;
4580         __u32 start = 0;
4581         int nToCopy;
4582         int n = nBytes;
4583         int nDone = 0;
4584         int nToWriteBack;
4585         int startOfWrite = offset;
4586         int chunkWritten = 0;
4587         int nBytesRead;
4588
4589         yaffs_Device *dev;
4590
4591         dev = in->myDev;
4592
4593         while (n > 0 && chunkWritten >= 0) {
4594                 //chunk = offset / dev->nDataBytesPerChunk + 1;
4595                 //start = offset % dev->nDataBytesPerChunk;
4596                 yaffs_AddrToChunk(dev,offset,&chunk,&start);
4597                 chunk++;
4598
4599                 /* OK now check for the curveball where the start and end are in
4600                  * the same chunk.
4601                  */
4602
4603                 if ((start + n) < dev->nDataBytesPerChunk) {
4604                         nToCopy = n;
4605
4606                         /* Now folks, to calculate how many bytes to write back....
4607                          * If we're overwriting and not writing to then end of file then
4608                          * we need to write back as much as was there before.
4609                          */
4610
4611                         nBytesRead =
4612                             in->variant.fileVariant.fileSize -
4613                             ((chunk - 1) * dev->nDataBytesPerChunk);
4614
4615                         if (nBytesRead > dev->nDataBytesPerChunk) {
4616                                 nBytesRead = dev->nDataBytesPerChunk;
4617                         }
4618
4619                         nToWriteBack =
4620                             (nBytesRead >
4621                              (start + n)) ? nBytesRead : (start + n);
4622
4623                 } else {
4624                         nToCopy = dev->nDataBytesPerChunk - start;
4625                         nToWriteBack = dev->nDataBytesPerChunk;
4626                 }
4627
4628                 if (nToCopy != dev->nDataBytesPerChunk) {
4629                         /* An incomplete start or end chunk (or maybe both start and end chunk) */
4630                         if (dev->nShortOpCaches > 0) {
4631                                 yaffs_ChunkCache *cache;
4632                                 /* If we can't find the data in the cache, then load the cache */
4633                                 cache = yaffs_FindChunkCache(in, chunk);
4634
4635                                 if (!cache
4636                                     && yaffs_CheckSpaceForAllocation(in->
4637                                                                      myDev)) {
4638                                         cache = yaffs_GrabChunkCache(in->myDev);
4639                                         cache->object = in;
4640                                         cache->chunkId = chunk;
4641                                         cache->dirty = 0;
4642                                         cache->locked = 0;
4643                                         yaffs_ReadChunkDataFromObject(in, chunk,
4644                                                                       cache->
4645                                                                       data);
4646                                 }
4647                                 else if(cache &&
4648                                         !cache->dirty &&
4649                                         !yaffs_CheckSpaceForAllocation(in->myDev)){
4650                                         /* Drop the cache if it was a read cache item and
4651                                          * no space check has been made for it.
4652                                          */
4653                                          cache = NULL;
4654                                 }
4655
4656                                 if (cache) {
4657                                         yaffs_UseChunkCache(dev, cache, 1);
4658                                         cache->locked = 1;
4659 #ifdef CONFIG_YAFFS_WINCE
4660                                         yfsd_UnlockYAFFS(TRUE);
4661 #endif
4662
4663                                         memcpy(&cache->data[start], buffer,
4664                                                nToCopy);
4665
4666 #ifdef CONFIG_YAFFS_WINCE
4667                                         yfsd_LockYAFFS(TRUE);
4668 #endif
4669                                         cache->locked = 0;
4670                                         cache->nBytes = nToWriteBack;
4671
4672                                         if (writeThrough) {
4673                                                 chunkWritten =
4674                                                     yaffs_WriteChunkDataToObject
4675                                                     (cache->object,
4676                                                      cache->chunkId,
4677                                                      cache->data, cache->nBytes,
4678                                                      1);
4679                                                 cache->dirty = 0;
4680                                         }
4681
4682                                 } else {
4683                                         chunkWritten = -1;      /* fail the write */
4684                                 }
4685                         } else {
4686                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
4687                                  * Read into the local buffer then copy, then copy over and write back.
4688                                  */
4689
4690                                 __u8 *localBuffer =
4691                                     yaffs_GetTempBuffer(dev, __LINE__);
4692
4693                                 yaffs_ReadChunkDataFromObject(in, chunk,
4694                                                               localBuffer);
4695
4696 #ifdef CONFIG_YAFFS_WINCE
4697                                 yfsd_UnlockYAFFS(TRUE);
4698 #endif
4699
4700                                 memcpy(&localBuffer[start], buffer, nToCopy);
4701
4702 #ifdef CONFIG_YAFFS_WINCE
4703                                 yfsd_LockYAFFS(TRUE);
4704 #endif
4705                                 chunkWritten =
4706                                     yaffs_WriteChunkDataToObject(in, chunk,
4707                                                                  localBuffer,
4708                                                                  nToWriteBack,
4709                                                                  0);
4710
4711                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4712                                                         __LINE__);
4713
4714                         }
4715
4716                 } else {
4717
4718 #ifdef CONFIG_YAFFS_WINCE
4719                         /* Under WinCE can't do direct transfer. Need to use a local buffer.
4720                          * This is because we otherwise screw up WinCE's memory mapper
4721                          */
4722                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4723 #ifdef CONFIG_YAFFS_WINCE
4724                         yfsd_UnlockYAFFS(TRUE);
4725 #endif
4726                         memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
4727 #ifdef CONFIG_YAFFS_WINCE
4728                         yfsd_LockYAFFS(TRUE);
4729 #endif
4730                         chunkWritten =
4731                             yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
4732                                                          dev->nDataBytesPerChunk,
4733                                                          0);
4734                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4735 #else
4736                         /* A full chunk. Write directly from the supplied buffer. */
4737                         chunkWritten =
4738                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
4739                                                          dev->nDataBytesPerChunk,
4740                                                          0);
4741 #endif
4742                         /* Since we've overwritten the cached data, we better invalidate it. */
4743                         yaffs_InvalidateChunkCache(in, chunk);
4744                 }
4745
4746                 if (chunkWritten >= 0) {
4747                         n -= nToCopy;
4748                         offset += nToCopy;
4749                         buffer += nToCopy;
4750                         nDone += nToCopy;
4751                 }
4752
4753         }
4754
4755         /* Update file object */
4756
4757         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
4758                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4759         }
4760
4761         in->dirty = 1;
4762
4763         return nDone;
4764 }
4765
4766
4767 /* ---------------------- File resizing stuff ------------------ */
4768
4769 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
4770 {
4771
4772         yaffs_Device *dev = in->myDev;
4773         int oldFileSize = in->variant.fileVariant.fileSize;
4774
4775         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4776
4777         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4778             dev->nDataBytesPerChunk;
4779         int i;
4780         int chunkId;
4781
4782         /* Delete backwards so that we don't end up with holes if
4783          * power is lost part-way through the operation.
4784          */
4785         for (i = lastDel; i >= startDel; i--) {
4786                 /* NB this could be optimised somewhat,
4787                  * eg. could retrieve the tags and write them without
4788                  * using yaffs_DeleteChunk
4789                  */
4790
4791                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4792                 if (chunkId > 0) {
4793                         if (chunkId <
4794                             (dev->internalStartBlock * dev->nChunksPerBlock)
4795                             || chunkId >=
4796                             ((dev->internalEndBlock +
4797                               1) * dev->nChunksPerBlock)) {
4798                                 T(YAFFS_TRACE_ALWAYS,
4799                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
4800                                    chunkId, i));
4801                         } else {
4802                                 in->nDataChunks--;
4803                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4804                         }
4805                 }
4806         }
4807
4808 }
4809
4810 int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
4811 {
4812
4813         int oldFileSize = in->variant.fileVariant.fileSize;
4814         __u32 newSizeOfPartialChunk = 0;
4815         __u32 newFullChunks = 0;
4816
4817         yaffs_Device *dev = in->myDev;
4818
4819         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4820
4821         yaffs_FlushFilesChunkCache(in);
4822         yaffs_InvalidateWholeChunkCache(in);
4823
4824         yaffs_CheckGarbageCollection(dev);
4825
4826         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
4827                 return yaffs_GetFileSize(in);
4828         }
4829
4830         if (newSize == oldFileSize) {
4831                 return oldFileSize;
4832         }
4833
4834         if (newSize < oldFileSize) {
4835
4836                 yaffs_PruneResizedChunks(in, newSize);
4837
4838                 if (newSizeOfPartialChunk != 0) {
4839                         int lastChunk = 1 + newFullChunks;
4840
4841                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
4842
4843                         /* Got to read and rewrite the last chunk with its new size and zero pad */
4844                         yaffs_ReadChunkDataFromObject(in, lastChunk,
4845                                                       localBuffer);
4846
4847                         memset(localBuffer + newSizeOfPartialChunk, 0,
4848                                dev->nDataBytesPerChunk - newSizeOfPartialChunk);
4849
4850                         yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
4851                                                      newSizeOfPartialChunk, 1);
4852
4853                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
4854                 }
4855
4856                 in->variant.fileVariant.fileSize = newSize;
4857
4858                 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
4859         } else {
4860                 /* newsSize > oldFileSize */
4861                 in->variant.fileVariant.fileSize = newSize;
4862         }
4863
4864
4865
4866         /* Write a new object header.
4867          * show we've shrunk the file, if need be
4868          * Do this only if the file is not in the deleted directories.
4869          */
4870         if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
4871             in->parent->objectId != YAFFS_OBJECTID_DELETED) {
4872                 yaffs_UpdateObjectHeader(in, NULL, 0,
4873                                          (newSize < oldFileSize) ? 1 : 0, 0);
4874         }
4875
4876         return YAFFS_OK;
4877 }
4878
4879 loff_t yaffs_GetFileSize(yaffs_Object * obj)
4880 {
4881         obj = yaffs_GetEquivalentObject(obj);
4882
4883         switch (obj->variantType) {
4884         case YAFFS_OBJECT_TYPE_FILE:
4885                 return obj->variant.fileVariant.fileSize;
4886         case YAFFS_OBJECT_TYPE_SYMLINK:
4887                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
4888         default:
4889                 return 0;
4890         }
4891 }
4892
4893
4894
4895 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
4896 {
4897         int retVal;
4898         if (in->dirty) {
4899                 yaffs_FlushFilesChunkCache(in);
4900                 if (updateTime) {
4901 #ifdef CONFIG_YAFFS_WINCE
4902                         yfsd_WinFileTimeNow(in->win_mtime);
4903 #else
4904
4905                         in->yst_mtime = Y_CURRENT_TIME;
4906
4907 #endif
4908                 }
4909
4910                 retVal =
4911                     (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
4912                      0) ? YAFFS_OK : YAFFS_FAIL;
4913         } else {
4914                 retVal = YAFFS_OK;
4915         }
4916
4917         return retVal;
4918
4919 }
4920
4921 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
4922 {
4923
4924         /* First off, invalidate the file's data in the cache, without flushing. */
4925         yaffs_InvalidateWholeChunkCache(in);
4926
4927         if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
4928                 /* Move to the unlinked directory so we have a record that it was deleted. */
4929                 yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
4930
4931         }
4932
4933         yaffs_RemoveObjectFromDirectory(in);
4934         yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
4935         in->chunkId = -1;
4936
4937         yaffs_FreeObject(in);
4938         return YAFFS_OK;
4939
4940 }
4941
4942 /* yaffs_DeleteFile deletes the whole file data
4943  * and the inode associated with the file.
4944  * It does not delete the links associated with the file.
4945  */
4946 static int yaffs_UnlinkFile(yaffs_Object * in)
4947 {
4948
4949         int retVal;
4950         int immediateDeletion = 0;
4951
4952         if (1) {
4953 /* XXX U-BOOT XXX */
4954 #if 0
4955 #ifdef __KERNEL__
4956                 if (!in->myInode) {
4957                         immediateDeletion = 1;
4958
4959                 }
4960 #endif
4961 #else
4962                 if (in->inUse <= 0) {
4963                         immediateDeletion = 1;
4964
4965                 }
4966 #endif
4967                 if (immediateDeletion) {
4968                         retVal =
4969                             yaffs_ChangeObjectName(in, in->myDev->deletedDir,
4970                                                    "deleted", 0, 0);
4971                         T(YAFFS_TRACE_TRACING,
4972                           (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
4973                            in->objectId));
4974                         in->deleted = 1;
4975                         in->myDev->nDeletedFiles++;
4976                         if (0 && in->myDev->isYaffs2) {
4977                                 yaffs_ResizeFile(in, 0);
4978                         }
4979                         yaffs_SoftDeleteFile(in);
4980                 } else {
4981                         retVal =
4982                             yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
4983                                                    "unlinked", 0, 0);
4984                 }
4985
4986         }
4987         return retVal;
4988 }
4989
4990 int yaffs_DeleteFile(yaffs_Object * in)
4991 {
4992         int retVal = YAFFS_OK;
4993
4994         if (in->nDataChunks > 0) {
4995                 /* Use soft deletion if there is data in the file */
4996                 if (!in->unlinked) {
4997                         retVal = yaffs_UnlinkFile(in);
4998                 }
4999                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5000                         in->deleted = 1;
5001                         in->myDev->nDeletedFiles++;
5002                         yaffs_SoftDeleteFile(in);
5003                 }
5004                 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
5005         } else {
5006                 /* The file has no data chunks so we toss it immediately */
5007                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5008                 in->variant.fileVariant.top = NULL;
5009                 yaffs_DoGenericObjectDeletion(in);
5010
5011                 return YAFFS_OK;
5012         }
5013 }
5014
5015 static int yaffs_DeleteDirectory(yaffs_Object * in)
5016 {
5017         /* First check that the directory is empty. */
5018         if (list_empty(&in->variant.directoryVariant.children)) {
5019                 return yaffs_DoGenericObjectDeletion(in);
5020         }
5021
5022         return YAFFS_FAIL;
5023
5024 }
5025
5026 static int yaffs_DeleteSymLink(yaffs_Object * in)
5027 {
5028         YFREE(in->variant.symLinkVariant.alias);
5029
5030         return yaffs_DoGenericObjectDeletion(in);
5031 }
5032
5033 static int yaffs_DeleteHardLink(yaffs_Object * in)
5034 {
5035         /* remove this hardlink from the list assocaited with the equivalent
5036          * object
5037          */
5038         list_del(&in->hardLinks);
5039         return yaffs_DoGenericObjectDeletion(in);
5040 }
5041
5042 static void yaffs_DestroyObject(yaffs_Object * obj)
5043 {
5044         switch (obj->variantType) {
5045         case YAFFS_OBJECT_TYPE_FILE:
5046                 yaffs_DeleteFile(obj);
5047                 break;
5048         case YAFFS_OBJECT_TYPE_DIRECTORY:
5049                 yaffs_DeleteDirectory(obj);
5050                 break;
5051         case YAFFS_OBJECT_TYPE_SYMLINK:
5052                 yaffs_DeleteSymLink(obj);
5053                 break;
5054         case YAFFS_OBJECT_TYPE_HARDLINK:
5055                 yaffs_DeleteHardLink(obj);
5056                 break;
5057         case YAFFS_OBJECT_TYPE_SPECIAL:
5058                 yaffs_DoGenericObjectDeletion(obj);
5059                 break;
5060         case YAFFS_OBJECT_TYPE_UNKNOWN:
5061                 break;          /* should not happen. */
5062         }
5063 }
5064
5065 static int yaffs_UnlinkWorker(yaffs_Object * obj)
5066 {
5067
5068         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5069                 return yaffs_DeleteHardLink(obj);
5070         } else if (!list_empty(&obj->hardLinks)) {
5071                 /* Curve ball: We're unlinking an object that has a hardlink.
5072                  *
5073                  * This problem arises because we are not strictly following
5074                  * The Linux link/inode model.
5075                  *
5076                  * We can't really delete the object.
5077                  * Instead, we do the following:
5078                  * - Select a hardlink.
5079                  * - Unhook it from the hard links
5080                  * - Unhook it from its parent directory (so that the rename can work)
5081                  * - Rename the object to the hardlink's name.
5082                  * - Delete the hardlink
5083                  */
5084
5085                 yaffs_Object *hl;
5086                 int retVal;
5087                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5088
5089                 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5090
5091                 list_del_init(&hl->hardLinks);
5092                 list_del_init(&hl->siblings);
5093
5094                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5095
5096                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5097
5098                 if (retVal == YAFFS_OK) {
5099                         retVal = yaffs_DoGenericObjectDeletion(hl);
5100                 }
5101                 return retVal;
5102
5103         } else {
5104                 switch (obj->variantType) {
5105                 case YAFFS_OBJECT_TYPE_FILE:
5106                         return yaffs_UnlinkFile(obj);
5107                         break;
5108                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5109                         return yaffs_DeleteDirectory(obj);
5110                         break;
5111                 case YAFFS_OBJECT_TYPE_SYMLINK:
5112                         return yaffs_DeleteSymLink(obj);
5113                         break;
5114                 case YAFFS_OBJECT_TYPE_SPECIAL:
5115                         return yaffs_DoGenericObjectDeletion(obj);
5116                         break;
5117                 case YAFFS_OBJECT_TYPE_HARDLINK:
5118                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5119                 default:
5120                         return YAFFS_FAIL;
5121                 }
5122         }
5123 }
5124
5125
5126 static int yaffs_UnlinkObject( yaffs_Object *obj)
5127 {
5128
5129         if (obj && obj->unlinkAllowed) {
5130                 return yaffs_UnlinkWorker(obj);
5131         }
5132
5133         return YAFFS_FAIL;
5134
5135 }
5136 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
5137 {
5138         yaffs_Object *obj;
5139
5140         obj = yaffs_FindObjectByName(dir, name);
5141         return yaffs_UnlinkObject(obj);
5142 }
5143
5144 /*----------------------- Initialisation Scanning ---------------------- */
5145
5146 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
5147                                        int backwardScanning)
5148 {
5149         yaffs_Object *obj;
5150
5151         if (!backwardScanning) {
5152                 /* Handle YAFFS1 forward scanning case
5153                  * For YAFFS1 we always do the deletion
5154                  */
5155
5156         } else {
5157                 /* Handle YAFFS2 case (backward scanning)
5158                  * If the shadowed object exists then ignore.
5159                  */
5160                 if (yaffs_FindObjectByNumber(dev, objId)) {
5161                         return;
5162                 }
5163         }
5164
5165         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5166          * We put it in unlinked dir to be cleaned up after the scanning
5167          */
5168         obj =
5169             yaffs_FindOrCreateObjectByNumber(dev, objId,
5170                                              YAFFS_OBJECT_TYPE_FILE);
5171         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5172         obj->variant.fileVariant.shrinkSize = 0;
5173         obj->valid = 1;         /* So that we don't read any other info for this file */
5174
5175 }
5176
5177 typedef struct {
5178         int seq;
5179         int block;
5180 } yaffs_BlockIndex;
5181
5182
5183 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5184 {
5185         yaffs_Object *hl;
5186         yaffs_Object *in;
5187
5188         while (hardList) {
5189                 hl = hardList;
5190                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5191
5192                 in = yaffs_FindObjectByNumber(dev,
5193                                               hl->variant.hardLinkVariant.
5194                                               equivalentObjectId);
5195
5196                 if (in) {
5197                         /* Add the hardlink pointers */
5198                         hl->variant.hardLinkVariant.equivalentObject = in;
5199                         list_add(&hl->hardLinks, &in->hardLinks);
5200                 } else {
5201                         /* Todo Need to report/handle this better.
5202                          * Got a problem... hardlink to a non-existant object
5203                          */
5204                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5205                         INIT_LIST_HEAD(&hl->hardLinks);
5206
5207                 }
5208
5209         }
5210
5211 }
5212
5213
5214
5215
5216
5217 static int ybicmp(const void *a, const void *b){
5218     register int aseq = ((yaffs_BlockIndex *)a)->seq;
5219     register int bseq = ((yaffs_BlockIndex *)b)->seq;
5220     register int ablock = ((yaffs_BlockIndex *)a)->block;
5221     register int bblock = ((yaffs_BlockIndex *)b)->block;
5222     if( aseq == bseq )
5223         return ablock - bblock;
5224     else
5225         return aseq - bseq;
5226
5227 }
5228
5229 static int yaffs_Scan(yaffs_Device * dev)
5230 {
5231         yaffs_ExtendedTags tags;
5232         int blk;
5233         int blockIterator;
5234         int startIterator;
5235         int endIterator;
5236         int nBlocksToScan = 0;
5237         int result;
5238
5239         int chunk;
5240         int c;
5241         int deleted;
5242         yaffs_BlockState state;
5243         yaffs_Object *hardList = NULL;
5244         yaffs_BlockInfo *bi;
5245         int sequenceNumber;
5246         yaffs_ObjectHeader *oh;
5247         yaffs_Object *in;
5248         yaffs_Object *parent;
5249         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5250
5251         int alloc_failed = 0;
5252
5253
5254         __u8 *chunkData;
5255
5256         yaffs_BlockIndex *blockIndex = NULL;
5257
5258         if (dev->isYaffs2) {
5259                 T(YAFFS_TRACE_SCAN,
5260                   (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
5261                 return YAFFS_FAIL;
5262         }
5263
5264         //TODO  Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
5265
5266         T(YAFFS_TRACE_SCAN,
5267           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
5268            dev->internalStartBlock, dev->internalEndBlock));
5269
5270         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5271
5272         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5273
5274         if (dev->isYaffs2) {
5275                 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5276                 if(!blockIndex)
5277                         return YAFFS_FAIL;
5278         }
5279
5280         /* Scan all the blocks to determine their state */
5281         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5282                 bi = yaffs_GetBlockInfo(dev, blk);
5283                 yaffs_ClearChunkBits(dev, blk);
5284                 bi->pagesInUse = 0;
5285                 bi->softDeletions = 0;
5286
5287                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5288
5289                 bi->blockState = state;
5290                 bi->sequenceNumber = sequenceNumber;
5291
5292                 T(YAFFS_TRACE_SCAN_DEBUG,
5293                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5294                    state, sequenceNumber));
5295
5296                 if (state == YAFFS_BLOCK_STATE_DEAD) {
5297                         T(YAFFS_TRACE_BAD_BLOCKS,
5298                           (TSTR("block %d is bad" TENDSTR), blk));
5299                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5300                         T(YAFFS_TRACE_SCAN_DEBUG,
5301                           (TSTR("Block empty " TENDSTR)));
5302                         dev->nErasedBlocks++;
5303                         dev->nFreeChunks += dev->nChunksPerBlock;
5304                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5305
5306                         /* Determine the highest sequence number */
5307                         if (dev->isYaffs2 &&
5308                             sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5309                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5310
5311                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
5312                                 blockIndex[nBlocksToScan].block = blk;
5313
5314                                 nBlocksToScan++;
5315
5316                                 if (sequenceNumber >= dev->sequenceNumber) {
5317                                         dev->sequenceNumber = sequenceNumber;
5318                                 }
5319                         } else if (dev->isYaffs2) {
5320                                 /* TODO: Nasty sequence number! */
5321                                 T(YAFFS_TRACE_SCAN,
5322                                   (TSTR
5323                                    ("Block scanning block %d has bad sequence number %d"
5324                                     TENDSTR), blk, sequenceNumber));
5325
5326                         }
5327                 }
5328         }
5329
5330         /* Sort the blocks
5331          * Dungy old bubble sort for now...
5332          */
5333         if (dev->isYaffs2) {
5334                 yaffs_BlockIndex temp;
5335                 int i;
5336                 int j;
5337
5338                 for (i = 0; i < nBlocksToScan; i++)
5339                         for (j = i + 1; j < nBlocksToScan; j++)
5340                                 if (blockIndex[i].seq > blockIndex[j].seq) {
5341                                         temp = blockIndex[j];
5342                                         blockIndex[j] = blockIndex[i];
5343                                         blockIndex[i] = temp;
5344                                 }
5345         }
5346
5347         /* Now scan the blocks looking at the data. */
5348         if (dev->isYaffs2) {
5349                 startIterator = 0;
5350                 endIterator = nBlocksToScan - 1;
5351                 T(YAFFS_TRACE_SCAN_DEBUG,
5352                   (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5353         } else {
5354                 startIterator = dev->internalStartBlock;
5355                 endIterator = dev->internalEndBlock;
5356         }
5357
5358         /* For each block.... */
5359         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5360              blockIterator++) {
5361
5362                 if (dev->isYaffs2) {
5363                         /* get the block to scan in the correct order */
5364                         blk = blockIndex[blockIterator].block;
5365                 } else {
5366                         blk = blockIterator;
5367                 }
5368
5369                 bi = yaffs_GetBlockInfo(dev, blk);
5370                 state = bi->blockState;
5371
5372                 deleted = 0;
5373
5374                 /* For each chunk in each block that needs scanning....*/
5375                 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5376                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5377                         /* Read the tags and decide what to do */
5378                         chunk = blk * dev->nChunksPerBlock + c;
5379
5380                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5381                                                         &tags);
5382
5383                         /* Let's have a good look at this chunk... */
5384
5385                         if (!dev->isYaffs2 && tags.chunkDeleted) {
5386                                 /* YAFFS1 only...
5387                                  * A deleted chunk
5388                                  */
5389                                 deleted++;
5390                                 dev->nFreeChunks++;
5391                                 /*T((" %d %d deleted\n",blk,c)); */
5392                         } else if (!tags.chunkUsed) {
5393                                 /* An unassigned chunk in the block
5394                                  * This means that either the block is empty or
5395                                  * this is the one being allocated from
5396                                  */
5397
5398                                 if (c == 0) {
5399                                         /* We're looking at the first chunk in the block so the block is unused */
5400                                         state = YAFFS_BLOCK_STATE_EMPTY;
5401                                         dev->nErasedBlocks++;
5402                                 } else {
5403                                         /* this is the block being allocated from */
5404                                         T(YAFFS_TRACE_SCAN,
5405                                           (TSTR
5406                                            (" Allocating from %d %d" TENDSTR),
5407                                            blk, c));
5408                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5409                                         dev->allocationBlock = blk;
5410                                         dev->allocationPage = c;
5411                                         dev->allocationBlockFinder = blk;
5412                                         /* Set it to here to encourage the allocator to go forth from here. */
5413
5414                                         /* Yaffs2 sanity check:
5415                                          * This should be the one with the highest sequence number
5416                                          */
5417                                         if (dev->isYaffs2
5418                                             && (dev->sequenceNumber !=
5419                                                 bi->sequenceNumber)) {
5420                                                 T(YAFFS_TRACE_ALWAYS,
5421                                                   (TSTR
5422                                                    ("yaffs: Allocation block %d was not highest sequence id:"
5423                                                     " block seq = %d, dev seq = %d"
5424                                                     TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
5425                                         }
5426                                 }
5427
5428                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5429                         } else if (tags.chunkId > 0) {
5430                                 /* chunkId > 0 so it is a data chunk... */
5431                                 unsigned int endpos;
5432
5433                                 yaffs_SetChunkBit(dev, blk, c);
5434                                 bi->pagesInUse++;
5435
5436                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5437                                                                       tags.
5438                                                                       objectId,
5439                                                                       YAFFS_OBJECT_TYPE_FILE);
5440                                 /* PutChunkIntoFile checks for a clash (two data chunks with
5441                                  * the same chunkId).
5442                                  */
5443
5444                                 if(!in)
5445                                         alloc_failed = 1;
5446
5447                                 if(in){
5448                                         if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
5449                                                 alloc_failed = 1;
5450                                 }
5451
5452                                 endpos =
5453                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5454                                     tags.byteCount;
5455                                 if (in &&
5456                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
5457                                     && in->variant.fileVariant.scannedFileSize <
5458                                     endpos) {
5459                                         in->variant.fileVariant.
5460                                             scannedFileSize = endpos;
5461                                         if (!dev->useHeaderFileSize) {
5462                                                 in->variant.fileVariant.
5463                                                     fileSize =
5464                                                     in->variant.fileVariant.
5465                                                     scannedFileSize;
5466                                         }
5467
5468                                 }
5469                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
5470                         } else {
5471                                 /* chunkId == 0, so it is an ObjectHeader.
5472                                  * Thus, we read in the object header and make the object
5473                                  */
5474                                 yaffs_SetChunkBit(dev, blk, c);
5475                                 bi->pagesInUse++;
5476
5477                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5478                                                                 chunkData,
5479                                                                 NULL);
5480
5481                                 oh = (yaffs_ObjectHeader *) chunkData;
5482
5483                                 in = yaffs_FindObjectByNumber(dev,
5484                                                               tags.objectId);
5485                                 if (in && in->variantType != oh->type) {
5486                                         /* This should not happen, but somehow
5487                                          * Wev'e ended up with an objectId that has been reused but not yet
5488                                          * deleted, and worse still it has changed type. Delete the old object.
5489                                          */
5490
5491                                         yaffs_DestroyObject(in);
5492
5493                                         in = 0;
5494                                 }
5495
5496                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5497                                                                       tags.
5498                                                                       objectId,
5499                                                                       oh->type);
5500
5501                                 if(!in)
5502                                         alloc_failed = 1;
5503
5504                                 if (in && oh->shadowsObject > 0) {
5505                                         yaffs_HandleShadowedObject(dev,
5506                                                                    oh->
5507                                                                    shadowsObject,
5508                                                                    0);
5509                                 }
5510
5511                                 if (in && in->valid) {
5512                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
5513
5514                                         unsigned existingSerial = in->serial;
5515                                         unsigned newSerial = tags.serialNumber;
5516
5517                                         if (dev->isYaffs2 ||
5518                                             ((existingSerial + 1) & 3) ==
5519                                             newSerial) {
5520                                                 /* Use new one - destroy the exisiting one */
5521                                                 yaffs_DeleteChunk(dev,
5522                                                                   in->chunkId,
5523                                                                   1, __LINE__);
5524                                                 in->valid = 0;
5525                                         } else {
5526                                                 /* Use existing - destroy this one. */
5527                                                 yaffs_DeleteChunk(dev, chunk, 1,
5528                                                                   __LINE__);
5529                                         }
5530                                 }
5531
5532                                 if (in && !in->valid &&
5533                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5534                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5535                                         /* We only load some info, don't fiddle with directory structure */
5536                                         in->valid = 1;
5537                                         in->variantType = oh->type;
5538
5539                                         in->yst_mode = oh->yst_mode;
5540 #ifdef CONFIG_YAFFS_WINCE
5541                                         in->win_atime[0] = oh->win_atime[0];
5542                                         in->win_ctime[0] = oh->win_ctime[0];
5543                                         in->win_mtime[0] = oh->win_mtime[0];
5544                                         in->win_atime[1] = oh->win_atime[1];
5545                                         in->win_ctime[1] = oh->win_ctime[1];
5546                                         in->win_mtime[1] = oh->win_mtime[1];
5547 #else
5548                                         in->yst_uid = oh->yst_uid;
5549                                         in->yst_gid = oh->yst_gid;
5550                                         in->yst_atime = oh->yst_atime;
5551                                         in->yst_mtime = oh->yst_mtime;
5552                                         in->yst_ctime = oh->yst_ctime;
5553                                         in->yst_rdev = oh->yst_rdev;
5554 #endif
5555                                         in->chunkId = chunk;
5556
5557                                 } else if (in && !in->valid) {
5558                                         /* we need to load this info */
5559
5560                                         in->valid = 1;
5561                                         in->variantType = oh->type;
5562
5563                                         in->yst_mode = oh->yst_mode;
5564 #ifdef CONFIG_YAFFS_WINCE
5565                                         in->win_atime[0] = oh->win_atime[0];
5566                                         in->win_ctime[0] = oh->win_ctime[0];
5567                                         in->win_mtime[0] = oh->win_mtime[0];
5568                                         in->win_atime[1] = oh->win_atime[1];
5569                                         in->win_ctime[1] = oh->win_ctime[1];
5570                                         in->win_mtime[1] = oh->win_mtime[1];
5571 #else
5572                                         in->yst_uid = oh->yst_uid;
5573                                         in->yst_gid = oh->yst_gid;
5574                                         in->yst_atime = oh->yst_atime;
5575                                         in->yst_mtime = oh->yst_mtime;
5576                                         in->yst_ctime = oh->yst_ctime;
5577                                         in->yst_rdev = oh->yst_rdev;
5578 #endif
5579                                         in->chunkId = chunk;
5580
5581                                         yaffs_SetObjectName(in, oh->name);
5582                                         in->dirty = 0;
5583
5584                                         /* directory stuff...
5585                                          * hook up to parent
5586                                          */
5587
5588                                         parent =
5589                                             yaffs_FindOrCreateObjectByNumber
5590                                             (dev, oh->parentObjectId,
5591                                              YAFFS_OBJECT_TYPE_DIRECTORY);
5592                                         if (parent->variantType ==
5593                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
5594                                                 /* Set up as a directory */
5595                                                 parent->variantType =
5596                                                     YAFFS_OBJECT_TYPE_DIRECTORY;
5597                                                 INIT_LIST_HEAD(&parent->variant.
5598                                                                directoryVariant.
5599                                                                children);
5600                                         } else if (parent->variantType !=
5601                                                    YAFFS_OBJECT_TYPE_DIRECTORY)
5602                                         {
5603                                                 /* Hoosterman, another problem....
5604                                                  * We're trying to use a non-directory as a directory
5605                                                  */
5606
5607                                                 T(YAFFS_TRACE_ERROR,
5608                                                   (TSTR
5609                                                    ("yaffs tragedy: attempting to use non-directory as"
5610                                                     " a directory in scan. Put in lost+found."
5611                                                     TENDSTR)));
5612                                                 parent = dev->lostNFoundDir;
5613                                         }
5614
5615                                         yaffs_AddObjectToDirectory(parent, in);
5616
5617                                         if (0 && (parent == dev->deletedDir ||
5618                                                   parent == dev->unlinkedDir)) {
5619                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
5620                                                 dev->nDeletedFiles++;
5621                                         }
5622                                         /* Note re hardlinks.
5623                                          * Since we might scan a hardlink before its equivalent object is scanned
5624                                          * we put them all in a list.
5625                                          * After scanning is complete, we should have all the objects, so we run through this
5626                                          * list and fix up all the chains.
5627                                          */
5628
5629                                         switch (in->variantType) {
5630                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
5631                                                 /* Todo got a problem */
5632                                                 break;
5633                                         case YAFFS_OBJECT_TYPE_FILE:
5634                                                 if (dev->isYaffs2
5635                                                     && oh->isShrink) {
5636                                                         /* Prune back the shrunken chunks */
5637                                                         yaffs_PruneResizedChunks
5638                                                             (in, oh->fileSize);
5639                                                         /* Mark the block as having a shrinkHeader */
5640                                                         bi->hasShrinkHeader = 1;
5641                                                 }
5642
5643                                                 if (dev->useHeaderFileSize)
5644
5645                                                         in->variant.fileVariant.
5646                                                             fileSize =
5647                                                             oh->fileSize;
5648
5649                                                 break;
5650                                         case YAFFS_OBJECT_TYPE_HARDLINK:
5651                                                 in->variant.hardLinkVariant.
5652                                                     equivalentObjectId =
5653                                                     oh->equivalentObjectId;
5654                                                 in->hardLinks.next =
5655                                                     (struct list_head *)
5656                                                     hardList;
5657                                                 hardList = in;
5658                                                 break;
5659                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
5660                                                 /* Do nothing */
5661                                                 break;
5662                                         case YAFFS_OBJECT_TYPE_SPECIAL:
5663                                                 /* Do nothing */
5664                                                 break;
5665                                         case YAFFS_OBJECT_TYPE_SYMLINK:
5666                                                 in->variant.symLinkVariant.alias =
5667                                                     yaffs_CloneString(oh->alias);
5668                                                 if(!in->variant.symLinkVariant.alias)
5669                                                         alloc_failed = 1;
5670                                                 break;
5671                                         }
5672
5673                                         if (parent == dev->deletedDir) {
5674                                                 yaffs_DestroyObject(in);
5675                                                 bi->hasShrinkHeader = 1;
5676                                         }
5677                                 }
5678                         }
5679                 }
5680
5681                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5682                         /* If we got this far while scanning, then the block is fully allocated.*/
5683                         state = YAFFS_BLOCK_STATE_FULL;
5684                 }
5685
5686                 bi->blockState = state;
5687
5688                 /* Now let's see if it was dirty */
5689                 if (bi->pagesInUse == 0 &&
5690                     !bi->hasShrinkHeader &&
5691                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5692                         yaffs_BlockBecameDirty(dev, blk);
5693                 }
5694
5695         }
5696
5697         if (blockIndex) {
5698                 YFREE(blockIndex);
5699         }
5700
5701
5702         /* Ok, we've done all the scanning.
5703          * Fix up the hard link chains.
5704          * We should now have scanned all the objects, now it's time to add these
5705          * hardlinks.
5706          */
5707
5708         yaffs_HardlinkFixup(dev,hardList);
5709
5710         /* Handle the unlinked files. Since they were left in an unlinked state we should
5711          * just delete them.
5712          */
5713         {
5714                 struct list_head *i;
5715                 struct list_head *n;
5716
5717                 yaffs_Object *l;
5718                 /* Soft delete all the unlinked files */
5719                 list_for_each_safe(i, n,
5720                                    &dev->unlinkedDir->variant.directoryVariant.
5721                                    children) {
5722                         if (i) {
5723                                 l = list_entry(i, yaffs_Object, siblings);
5724                                 yaffs_DestroyObject(l);
5725                         }
5726                 }
5727         }
5728
5729         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5730
5731         if(alloc_failed){
5732                 return YAFFS_FAIL;
5733         }
5734
5735         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5736
5737
5738         return YAFFS_OK;
5739 }
5740
5741 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5742 {
5743         __u8 *chunkData;
5744         yaffs_ObjectHeader *oh;
5745         yaffs_Device *dev = in->myDev;
5746         yaffs_ExtendedTags tags;
5747         int result;
5748         int alloc_failed = 0;
5749
5750         if(!in)
5751                 return;
5752
5753 #if 0
5754         T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
5755                 in->objectId,
5756                 in->lazyLoaded ? "not yet" : "already"));
5757 #endif
5758
5759         if(in->lazyLoaded){
5760                 in->lazyLoaded = 0;
5761                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5762
5763                 result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
5764                 oh = (yaffs_ObjectHeader *) chunkData;
5765
5766                 in->yst_mode = oh->yst_mode;
5767 #ifdef CONFIG_YAFFS_WINCE
5768                 in->win_atime[0] = oh->win_atime[0];
5769                 in->win_ctime[0] = oh->win_ctime[0];
5770                 in->win_mtime[0] = oh->win_mtime[0];
5771                 in->win_atime[1] = oh->win_atime[1];
5772                 in->win_ctime[1] = oh->win_ctime[1];
5773                 in->win_mtime[1] = oh->win_mtime[1];
5774 #else
5775                 in->yst_uid = oh->yst_uid;
5776                 in->yst_gid = oh->yst_gid;
5777                 in->yst_atime = oh->yst_atime;
5778                 in->yst_mtime = oh->yst_mtime;
5779                 in->yst_ctime = oh->yst_ctime;
5780                 in->yst_rdev = oh->yst_rdev;
5781
5782 #endif
5783                 yaffs_SetObjectName(in, oh->name);
5784
5785                 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
5786                          in->variant.symLinkVariant.alias =
5787                                                     yaffs_CloneString(oh->alias);
5788                         if(!in->variant.symLinkVariant.alias)
5789                                 alloc_failed = 1; /* Not returned to caller */
5790                 }
5791
5792                 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
5793         }
5794 }
5795
5796 static int yaffs_ScanBackwards(yaffs_Device * dev)
5797 {
5798         yaffs_ExtendedTags tags;
5799         int blk;
5800         int blockIterator;
5801         int startIterator;
5802         int endIterator;
5803         int nBlocksToScan = 0;
5804
5805         int chunk;
5806         int result;
5807         int c;
5808         int deleted;
5809         yaffs_BlockState state;
5810         yaffs_Object *hardList = NULL;
5811         yaffs_BlockInfo *bi;
5812         int sequenceNumber;
5813         yaffs_ObjectHeader *oh;
5814         yaffs_Object *in;
5815         yaffs_Object *parent;
5816         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5817         int itsUnlinked;
5818         __u8 *chunkData;
5819
5820         int fileSize;
5821         int isShrink;
5822         int foundChunksInBlock;
5823         int equivalentObjectId;
5824         int alloc_failed = 0;
5825
5826
5827         yaffs_BlockIndex *blockIndex = NULL;
5828         int altBlockIndex = 0;
5829
5830         if (!dev->isYaffs2) {
5831                 T(YAFFS_TRACE_SCAN,
5832                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5833                 return YAFFS_FAIL;
5834         }
5835
5836         T(YAFFS_TRACE_SCAN,
5837           (TSTR
5838            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
5839             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5840
5841
5842         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5843
5844         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5845
5846         if(!blockIndex) {
5847                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
5848                 altBlockIndex = 1;
5849         }
5850
5851         if(!blockIndex) {
5852                 T(YAFFS_TRACE_SCAN,
5853                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
5854                 return YAFFS_FAIL;
5855         }
5856
5857         dev->blocksInCheckpoint = 0;
5858
5859         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5860
5861         /* Scan all the blocks to determine their state */
5862         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5863                 bi = yaffs_GetBlockInfo(dev, blk);
5864                 yaffs_ClearChunkBits(dev, blk);
5865                 bi->pagesInUse = 0;
5866                 bi->softDeletions = 0;
5867
5868                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5869
5870                 bi->blockState = state;
5871                 bi->sequenceNumber = sequenceNumber;
5872
5873                 if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
5874                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
5875
5876                 T(YAFFS_TRACE_SCAN_DEBUG,
5877                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5878                    state, sequenceNumber));
5879
5880
5881                 if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
5882                         dev->blocksInCheckpoint++;
5883
5884                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
5885                         T(YAFFS_TRACE_BAD_BLOCKS,
5886                           (TSTR("block %d is bad" TENDSTR), blk));
5887                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5888                         T(YAFFS_TRACE_SCAN_DEBUG,
5889                           (TSTR("Block empty " TENDSTR)));
5890                         dev->nErasedBlocks++;
5891                         dev->nFreeChunks += dev->nChunksPerBlock;
5892                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5893
5894                         /* Determine the highest sequence number */
5895                         if (dev->isYaffs2 &&
5896                             sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5897                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
5898
5899                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
5900                                 blockIndex[nBlocksToScan].block = blk;
5901
5902                                 nBlocksToScan++;
5903
5904                                 if (sequenceNumber >= dev->sequenceNumber) {
5905                                         dev->sequenceNumber = sequenceNumber;
5906                                 }
5907                         } else if (dev->isYaffs2) {
5908                                 /* TODO: Nasty sequence number! */
5909                                 T(YAFFS_TRACE_SCAN,
5910                                   (TSTR
5911                                    ("Block scanning block %d has bad sequence number %d"
5912                                     TENDSTR), blk, sequenceNumber));
5913
5914                         }
5915                 }
5916         }
5917
5918         T(YAFFS_TRACE_SCAN,
5919         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
5920
5921
5922
5923         YYIELD();
5924
5925         /* Sort the blocks */
5926 #ifndef CONFIG_YAFFS_USE_OWN_SORT
5927         {
5928                 /* Use qsort now. */
5929                 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
5930         }
5931 #else
5932         {
5933                 /* Dungy old bubble sort... */
5934
5935                 yaffs_BlockIndex temp;
5936                 int i;
5937                 int j;
5938
5939                 for (i = 0; i < nBlocksToScan; i++)
5940                         for (j = i + 1; j < nBlocksToScan; j++)
5941                                 if (blockIndex[i].seq > blockIndex[j].seq) {
5942                                         temp = blockIndex[j];
5943                                         blockIndex[j] = blockIndex[i];
5944                                         blockIndex[i] = temp;
5945                                 }
5946         }
5947 #endif
5948
5949         YYIELD();
5950
5951         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
5952
5953         /* Now scan the blocks looking at the data. */
5954         startIterator = 0;
5955         endIterator = nBlocksToScan - 1;
5956         T(YAFFS_TRACE_SCAN_DEBUG,
5957           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
5958
5959         /* For each block.... backwards */
5960         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
5961              blockIterator--) {
5962                 /* Cooperative multitasking! This loop can run for so
5963                    long that watchdog timers expire. */
5964                 YYIELD();
5965
5966                 /* get the block to scan in the correct order */
5967                 blk = blockIndex[blockIterator].block;
5968
5969                 bi = yaffs_GetBlockInfo(dev, blk);
5970
5971
5972                 state = bi->blockState;
5973
5974                 deleted = 0;
5975
5976                 /* For each chunk in each block that needs scanning.... */
5977                 foundChunksInBlock = 0;
5978                 for (c = dev->nChunksPerBlock - 1;
5979                      !alloc_failed && c >= 0 &&
5980                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
5981                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
5982                         /* Scan backwards...
5983                          * Read the tags and decide what to do
5984                          */
5985
5986                         chunk = blk * dev->nChunksPerBlock + c;
5987
5988                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5989                                                         &tags);
5990
5991                         /* Let's have a good look at this chunk... */
5992
5993                         if (!tags.chunkUsed) {
5994                                 /* An unassigned chunk in the block.
5995                                  * If there are used chunks after this one, then
5996                                  * it is a chunk that was skipped due to failing the erased
5997                                  * check. Just skip it so that it can be deleted.
5998                                  * But, more typically, We get here when this is an unallocated
5999                                  * chunk and his means that either the block is empty or
6000                                  * this is the one being allocated from
6001                                  */
6002
6003                                 if(foundChunksInBlock)
6004                                 {
6005                                         /* This is a chunk that was skipped due to failing the erased check */
6006
6007                                 } else if (c == 0) {
6008                                         /* We're looking at the first chunk in the block so the block is unused */
6009                                         state = YAFFS_BLOCK_STATE_EMPTY;
6010                                         dev->nErasedBlocks++;
6011                                 } else {
6012                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6013                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6014                                                 if(dev->sequenceNumber == bi->sequenceNumber) {
6015                                                         /* this is the block being allocated from */
6016
6017                                                         T(YAFFS_TRACE_SCAN,
6018                                                           (TSTR
6019                                                            (" Allocating from %d %d"
6020                                                             TENDSTR), blk, c));
6021
6022                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6023                                                         dev->allocationBlock = blk;
6024                                                         dev->allocationPage = c;
6025                                                         dev->allocationBlockFinder = blk;
6026                                                 }
6027                                                 else {
6028                                                         /* This is a partially written block that is not
6029                                                          * the current allocation block. This block must have
6030                                                          * had a write failure, so set up for retirement.
6031                                                          */
6032
6033                                                          bi->needsRetiring = 1;
6034                                                          bi->gcPrioritise = 1;
6035
6036                                                          T(YAFFS_TRACE_ALWAYS,
6037                                                          (TSTR("Partially written block %d being set for retirement" TENDSTR),
6038                                                          blk));
6039                                                 }
6040
6041                                         }
6042
6043                                 }
6044
6045                                 dev->nFreeChunks++;
6046
6047                         } else if (tags.chunkId > 0) {
6048                                 /* chunkId > 0 so it is a data chunk... */
6049                                 unsigned int endpos;
6050                                 __u32 chunkBase =
6051                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6052
6053                                 foundChunksInBlock = 1;
6054
6055
6056                                 yaffs_SetChunkBit(dev, blk, c);
6057                                 bi->pagesInUse++;
6058
6059                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6060                                                                       tags.
6061                                                                       objectId,
6062                                                                       YAFFS_OBJECT_TYPE_FILE);
6063                                 if(!in){
6064                                         /* Out of memory */
6065                                         alloc_failed = 1;
6066                                 }
6067
6068                                 if (in &&
6069                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6070                                     && chunkBase <
6071                                     in->variant.fileVariant.shrinkSize) {
6072                                         /* This has not been invalidated by a resize */
6073                                         if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
6074                                                                chunk, -1)){
6075                                                 alloc_failed = 1;
6076                                         }
6077
6078                                         /* File size is calculated by looking at the data chunks if we have not
6079                                          * seen an object header yet. Stop this practice once we find an object header.
6080                                          */
6081                                         endpos =
6082                                             (tags.chunkId -
6083                                              1) * dev->nDataBytesPerChunk +
6084                                             tags.byteCount;
6085
6086                                         if (!in->valid &&       /* have not got an object header yet */
6087                                             in->variant.fileVariant.
6088                                             scannedFileSize < endpos) {
6089                                                 in->variant.fileVariant.
6090                                                     scannedFileSize = endpos;
6091                                                 in->variant.fileVariant.
6092                                                     fileSize =
6093                                                     in->variant.fileVariant.
6094                                                     scannedFileSize;
6095                                         }
6096
6097                                 } else if(in) {
6098                                         /* This chunk has been invalidated by a resize, so delete */
6099                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6100
6101                                 }
6102                         } else {
6103                                 /* chunkId == 0, so it is an ObjectHeader.
6104                                  * Thus, we read in the object header and make the object
6105                                  */
6106                                 foundChunksInBlock = 1;
6107
6108                                 yaffs_SetChunkBit(dev, blk, c);
6109                                 bi->pagesInUse++;
6110
6111                                 oh = NULL;
6112                                 in = NULL;
6113
6114                                 if (tags.extraHeaderInfoAvailable) {
6115                                         in = yaffs_FindOrCreateObjectByNumber
6116                                             (dev, tags.objectId,
6117                                              tags.extraObjectType);
6118                                 }
6119
6120                                 if (!in ||
6121 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6122                                     !in->valid ||
6123 #endif
6124                                     tags.extraShadows ||
6125                                     (!in->valid &&
6126                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6127                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
6128                                     ) {
6129
6130                                         /* If we don't have  valid info then we need to read the chunk
6131                                          * TODO In future we can probably defer reading the chunk and
6132                                          * living with invalid data until needed.
6133                                          */
6134
6135                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6136                                                                         chunk,
6137                                                                         chunkData,
6138                                                                         NULL);
6139
6140                                         oh = (yaffs_ObjectHeader *) chunkData;
6141
6142                                         if (!in)
6143                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6144
6145                                 }
6146
6147                                 if (!in) {
6148                                         /* TODO Hoosterman we have a problem! */
6149                                         T(YAFFS_TRACE_ERROR,
6150                                           (TSTR
6151                                            ("yaffs tragedy: Could not make object for object  %d  "
6152                                             "at chunk %d during scan"
6153                                             TENDSTR), tags.objectId, chunk));
6154
6155                                 }
6156
6157                                 if (in->valid) {
6158                                         /* We have already filled this one.
6159                                          * We have a duplicate that will be discarded, but
6160                                          * we first have to suck out resize info if it is a file.
6161                                          */
6162
6163                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6164                                              ((oh &&
6165                                                oh-> type == YAFFS_OBJECT_TYPE_FILE)||
6166                                               (tags.extraHeaderInfoAvailable  &&
6167                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
6168                                             ) {
6169                                                 __u32 thisSize =
6170                                                     (oh) ? oh->fileSize : tags.
6171                                                     extraFileLength;
6172                                                 __u32 parentObjectId =
6173                                                     (oh) ? oh->
6174                                                     parentObjectId : tags.
6175                                                     extraParentObjectId;
6176                                                 unsigned isShrink =
6177                                                     (oh) ? oh->isShrink : tags.
6178                                                     extraIsShrinkHeader;
6179
6180                                                 /* If it is deleted (unlinked at start also means deleted)
6181                                                  * we treat the file size as being zeroed at this point.
6182                                                  */
6183                                                 if (parentObjectId ==
6184                                                     YAFFS_OBJECTID_DELETED
6185                                                     || parentObjectId ==
6186                                                     YAFFS_OBJECTID_UNLINKED) {
6187                                                         thisSize = 0;
6188                                                         isShrink = 1;
6189                                                 }
6190
6191                                                 if (isShrink &&
6192                                                     in->variant.fileVariant.
6193                                                     shrinkSize > thisSize) {
6194                                                         in->variant.fileVariant.
6195                                                             shrinkSize =
6196                                                             thisSize;
6197                                                 }
6198
6199                                                 if (isShrink) {
6200                                                         bi->hasShrinkHeader = 1;
6201                                                 }
6202
6203                                         }
6204                                         /* Use existing - destroy this one. */
6205                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6206
6207                                 }
6208
6209                                 if (!in->valid &&
6210                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6211                                      tags.objectId ==
6212                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6213                                         /* We only load some info, don't fiddle with directory structure */
6214                                         in->valid = 1;
6215
6216                                         if(oh) {
6217                                                 in->variantType = oh->type;
6218
6219                                                 in->yst_mode = oh->yst_mode;
6220 #ifdef CONFIG_YAFFS_WINCE
6221                                                 in->win_atime[0] = oh->win_atime[0];
6222                                                 in->win_ctime[0] = oh->win_ctime[0];
6223                                                 in->win_mtime[0] = oh->win_mtime[0];
6224                                                 in->win_atime[1] = oh->win_atime[1];
6225                                                 in->win_ctime[1] = oh->win_ctime[1];
6226                                                 in->win_mtime[1] = oh->win_mtime[1];
6227 #else
6228                                                 in->yst_uid = oh->yst_uid;
6229                                                 in->yst_gid = oh->yst_gid;
6230                                                 in->yst_atime = oh->yst_atime;
6231                                                 in->yst_mtime = oh->yst_mtime;
6232                                                 in->yst_ctime = oh->yst_ctime;
6233                                                 in->yst_rdev = oh->yst_rdev;
6234
6235 #endif
6236                                         } else {
6237                                                 in->variantType = tags.extraObjectType;
6238                                                 in->lazyLoaded = 1;
6239                                         }
6240
6241                                         in->chunkId = chunk;
6242
6243                                 } else if (!in->valid) {
6244                                         /* we need to load this info */
6245
6246                                         in->valid = 1;
6247                                         in->chunkId = chunk;
6248
6249                                         if(oh) {
6250                                                 in->variantType = oh->type;
6251
6252                                                 in->yst_mode = oh->yst_mode;
6253 #ifdef CONFIG_YAFFS_WINCE
6254                                                 in->win_atime[0] = oh->win_atime[0];
6255                                                 in->win_ctime[0] = oh->win_ctime[0];
6256                                                 in->win_mtime[0] = oh->win_mtime[0];
6257                                                 in->win_atime[1] = oh->win_atime[1];
6258                                                 in->win_ctime[1] = oh->win_ctime[1];
6259                                                 in->win_mtime[1] = oh->win_mtime[1];
6260 #else
6261                                                 in->yst_uid = oh->yst_uid;
6262                                                 in->yst_gid = oh->yst_gid;
6263                                                 in->yst_atime = oh->yst_atime;
6264                                                 in->yst_mtime = oh->yst_mtime;
6265                                                 in->yst_ctime = oh->yst_ctime;
6266                                                 in->yst_rdev = oh->yst_rdev;
6267 #endif
6268
6269                                                 if (oh->shadowsObject > 0)
6270                                                         yaffs_HandleShadowedObject(dev,
6271                                                                            oh->
6272                                                                            shadowsObject,
6273                                                                            1);
6274
6275
6276                                                 yaffs_SetObjectName(in, oh->name);
6277                                                 parent =
6278                                                     yaffs_FindOrCreateObjectByNumber
6279                                                         (dev, oh->parentObjectId,
6280                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6281
6282                                                  fileSize = oh->fileSize;
6283                                                  isShrink = oh->isShrink;
6284                                                  equivalentObjectId = oh->equivalentObjectId;
6285
6286                                         }
6287                                         else {
6288                                                 in->variantType = tags.extraObjectType;
6289                                                 parent =
6290                                                     yaffs_FindOrCreateObjectByNumber
6291                                                         (dev, tags.extraParentObjectId,
6292                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6293                                                  fileSize = tags.extraFileLength;
6294                                                  isShrink = tags.extraIsShrinkHeader;
6295                                                  equivalentObjectId = tags.extraEquivalentObjectId;
6296                                                 in->lazyLoaded = 1;
6297
6298                                         }
6299                                         in->dirty = 0;
6300
6301                                         /* directory stuff...
6302                                          * hook up to parent
6303                                          */
6304
6305                                         if (parent->variantType ==
6306                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6307                                                 /* Set up as a directory */
6308                                                 parent->variantType =
6309                                                     YAFFS_OBJECT_TYPE_DIRECTORY;
6310                                                 INIT_LIST_HEAD(&parent->variant.
6311                                                                directoryVariant.
6312                                                                children);
6313                                         } else if (parent->variantType !=
6314                                                    YAFFS_OBJECT_TYPE_DIRECTORY)
6315                                         {
6316                                                 /* Hoosterman, another problem....
6317                                                  * We're trying to use a non-directory as a directory
6318                                                  */
6319
6320                                                 T(YAFFS_TRACE_ERROR,
6321                                                   (TSTR
6322                                                    ("yaffs tragedy: attempting to use non-directory as"
6323                                                     " a directory in scan. Put in lost+found."
6324                                                     TENDSTR)));
6325                                                 parent = dev->lostNFoundDir;
6326                                         }
6327
6328                                         yaffs_AddObjectToDirectory(parent, in);
6329
6330                                         itsUnlinked = (parent == dev->deletedDir) ||
6331                                                       (parent == dev->unlinkedDir);
6332
6333                                         if (isShrink) {
6334                                                 /* Mark the block as having a shrinkHeader */
6335                                                 bi->hasShrinkHeader = 1;
6336                                         }
6337
6338                                         /* Note re hardlinks.
6339                                          * Since we might scan a hardlink before its equivalent object is scanned
6340                                          * we put them all in a list.
6341                                          * After scanning is complete, we should have all the objects, so we run
6342                                          * through this list and fix up all the chains.
6343                                          */
6344
6345                                         switch (in->variantType) {
6346                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6347                                                 /* Todo got a problem */
6348                                                 break;
6349                                         case YAFFS_OBJECT_TYPE_FILE:
6350
6351                                                 if (in->variant.fileVariant.
6352                                                     scannedFileSize < fileSize) {
6353                                                         /* This covers the case where the file size is greater
6354                                                          * than where the data is
6355                                                          * This will happen if the file is resized to be larger
6356                                                          * than its current data extents.
6357                                                          */
6358                                                         in->variant.fileVariant.fileSize = fileSize;
6359                                                         in->variant.fileVariant.scannedFileSize =
6360                                                             in->variant.fileVariant.fileSize;
6361                                                 }
6362
6363                                                 if (isShrink &&
6364                                                     in->variant.fileVariant.shrinkSize > fileSize) {
6365                                                         in->variant.fileVariant.shrinkSize = fileSize;
6366                                                 }
6367
6368                                                 break;
6369                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6370                                                 if(!itsUnlinked) {
6371                                                   in->variant.hardLinkVariant.equivalentObjectId =
6372                                                     equivalentObjectId;
6373                                                   in->hardLinks.next =
6374                                                     (struct list_head *) hardList;
6375                                                   hardList = in;
6376                                                 }
6377                                                 break;
6378                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6379                                                 /* Do nothing */
6380                                                 break;
6381                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6382                                                 /* Do nothing */
6383                                                 break;
6384                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6385                                                 if(oh){
6386                                                    in->variant.symLinkVariant.alias =
6387                                                     yaffs_CloneString(oh->
6388                                                                       alias);
6389                                                    if(!in->variant.symLinkVariant.alias)
6390                                                         alloc_failed = 1;
6391                                                 }
6392                                                 break;
6393                                         }
6394
6395                                 }
6396
6397                         }
6398
6399                 } /* End of scanning for each chunk */
6400
6401                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6402                         /* If we got this far while scanning, then the block is fully allocated. */
6403                         state = YAFFS_BLOCK_STATE_FULL;
6404                 }
6405
6406                 bi->blockState = state;
6407
6408                 /* Now let's see if it was dirty */
6409                 if (bi->pagesInUse == 0 &&
6410                     !bi->hasShrinkHeader &&
6411                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6412                         yaffs_BlockBecameDirty(dev, blk);
6413                 }
6414
6415         }
6416
6417         if (altBlockIndex)
6418                 YFREE_ALT(blockIndex);
6419         else
6420                 YFREE(blockIndex);
6421
6422         /* Ok, we've done all the scanning.
6423          * Fix up the hard link chains.
6424          * We should now have scanned all the objects, now it's time to add these
6425          * hardlinks.
6426          */
6427         yaffs_HardlinkFixup(dev,hardList);
6428
6429
6430         /*
6431         *  Sort out state of unlinked and deleted objects.
6432         */
6433         {
6434                 struct list_head *i;
6435                 struct list_head *n;
6436
6437                 yaffs_Object *l;
6438
6439                 /* Soft delete all the unlinked files */
6440                 list_for_each_safe(i, n,
6441                                    &dev->unlinkedDir->variant.directoryVariant.
6442                                    children) {
6443                         if (i) {
6444                                 l = list_entry(i, yaffs_Object, siblings);
6445                                 yaffs_DestroyObject(l);
6446                         }
6447                 }
6448
6449                 /* Soft delete all the deletedDir files */
6450                 list_for_each_safe(i, n,
6451                                    &dev->deletedDir->variant.directoryVariant.
6452                                    children) {
6453                         if (i) {
6454                                 l = list_entry(i, yaffs_Object, siblings);
6455                                 yaffs_DestroyObject(l);
6456
6457                         }
6458                 }
6459         }
6460
6461         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6462
6463         if(alloc_failed){
6464                 return YAFFS_FAIL;
6465         }
6466
6467         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6468
6469         return YAFFS_OK;
6470 }
6471
6472 /*------------------------------  Directory Functions ----------------------------- */
6473
6474 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
6475 {
6476         yaffs_Device *dev = obj->myDev;
6477
6478         if(dev && dev->removeObjectCallback)
6479                 dev->removeObjectCallback(obj);
6480
6481         list_del_init(&obj->siblings);
6482         obj->parent = NULL;
6483 }
6484
6485
6486 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
6487                                        yaffs_Object * obj)
6488 {
6489
6490         if (!directory) {
6491                 T(YAFFS_TRACE_ALWAYS,
6492                   (TSTR
6493                    ("tragedy: Trying to add an object to a null pointer directory"
6494                     TENDSTR)));
6495                 YBUG();
6496         }
6497         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6498                 T(YAFFS_TRACE_ALWAYS,
6499                   (TSTR
6500                    ("tragedy: Trying to add an object to a non-directory"
6501                     TENDSTR)));
6502                 YBUG();
6503         }
6504
6505         if (obj->siblings.prev == NULL) {
6506                 /* Not initialised */
6507                 INIT_LIST_HEAD(&obj->siblings);
6508
6509         } else if (!list_empty(&obj->siblings)) {
6510                 /* If it is holed up somewhere else, un hook it */
6511                 yaffs_RemoveObjectFromDirectory(obj);
6512         }
6513         /* Now add it */
6514         list_add(&obj->siblings, &directory->variant.directoryVariant.children);
6515         obj->parent = directory;
6516
6517         if (directory == obj->myDev->unlinkedDir
6518             || directory == obj->myDev->deletedDir) {
6519                 obj->unlinked = 1;
6520                 obj->myDev->nUnlinkedFiles++;
6521                 obj->renameAllowed = 0;
6522         }
6523 }
6524
6525 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
6526                                      const YCHAR * name)
6527 {
6528         int sum;
6529
6530         struct list_head *i;
6531         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6532
6533         yaffs_Object *l;
6534
6535         if (!name) {
6536                 return NULL;
6537         }
6538
6539         if (!directory) {
6540                 T(YAFFS_TRACE_ALWAYS,
6541                   (TSTR
6542                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6543                     TENDSTR)));
6544                 YBUG();
6545         }
6546         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6547                 T(YAFFS_TRACE_ALWAYS,
6548                   (TSTR
6549                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6550                 YBUG();
6551         }
6552
6553         sum = yaffs_CalcNameSum(name);
6554
6555         list_for_each(i, &directory->variant.directoryVariant.children) {
6556                 if (i) {
6557                         l = list_entry(i, yaffs_Object, siblings);
6558
6559                         yaffs_CheckObjectDetailsLoaded(l);
6560
6561                         /* Special case for lost-n-found */
6562                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6563                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
6564                                         return l;
6565                                 }
6566                         } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
6567                         {
6568                                 /* LostnFound cunk called Objxxx
6569                                  * Do a real check
6570                                  */
6571                                 yaffs_GetObjectName(l, buffer,
6572                                                     YAFFS_MAX_NAME_LENGTH);
6573                                 if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
6574                                         return l;
6575                                 }
6576
6577                         }
6578                 }
6579         }
6580
6581         return NULL;
6582 }
6583
6584
6585 #if 0
6586 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
6587                                    int (*fn) (yaffs_Object *))
6588 {
6589         struct list_head *i;
6590         yaffs_Object *l;
6591
6592         if (!theDir) {
6593                 T(YAFFS_TRACE_ALWAYS,
6594                   (TSTR
6595                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6596                     TENDSTR)));
6597                 YBUG();
6598         }
6599         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6600                 T(YAFFS_TRACE_ALWAYS,
6601                   (TSTR
6602                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6603                 YBUG();
6604         }
6605
6606         list_for_each(i, &theDir->variant.directoryVariant.children) {
6607                 if (i) {
6608                         l = list_entry(i, yaffs_Object, siblings);
6609                         if (l && !fn(l)) {
6610                                 return YAFFS_FAIL;
6611                         }
6612                 }
6613         }
6614
6615         return YAFFS_OK;
6616
6617 }
6618 #endif
6619
6620 /* GetEquivalentObject dereferences any hard links to get to the
6621  * actual object.
6622  */
6623
6624 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
6625 {
6626         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6627                 /* We want the object id of the equivalent object, not this one */
6628                 obj = obj->variant.hardLinkVariant.equivalentObject;
6629                 yaffs_CheckObjectDetailsLoaded(obj);
6630         }
6631         return obj;
6632
6633 }
6634
6635 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
6636 {
6637         memset(name, 0, buffSize * sizeof(YCHAR));
6638
6639         yaffs_CheckObjectDetailsLoaded(obj);
6640
6641         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6642                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6643         } else if (obj->chunkId <= 0) {
6644                 YCHAR locName[20];
6645                 /* make up a name */
6646                 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
6647                               obj->objectId);
6648                 yaffs_strncpy(name, locName, buffSize - 1);
6649
6650         }
6651 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6652         else if (obj->shortName[0]) {
6653                 yaffs_strcpy(name, obj->shortName);
6654         }
6655 #endif
6656         else {
6657                 int result;
6658                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6659
6660                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6661
6662                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6663
6664                 if (obj->chunkId >= 0) {
6665                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6666                                                         obj->chunkId, buffer,
6667                                                         NULL);
6668                 }
6669                 yaffs_strncpy(name, oh->name, buffSize - 1);
6670
6671                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6672         }
6673
6674         return yaffs_strlen(name);
6675 }
6676
6677 int yaffs_GetObjectFileLength(yaffs_Object * obj)
6678 {
6679
6680         /* Dereference any hard linking */
6681         obj = yaffs_GetEquivalentObject(obj);
6682
6683         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
6684                 return obj->variant.fileVariant.fileSize;
6685         }
6686         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6687                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6688         } else {
6689                 /* Only a directory should drop through to here */
6690                 return obj->myDev->nDataBytesPerChunk;
6691         }
6692 }
6693
6694 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
6695 {
6696         int count = 0;
6697         struct list_head *i;
6698
6699         if (!obj->unlinked) {
6700                 count++;        /* the object itself */
6701         }
6702         list_for_each(i, &obj->hardLinks) {
6703                 count++;        /* add the hard links; */
6704         }
6705         return count;
6706
6707 }
6708
6709 int yaffs_GetObjectInode(yaffs_Object * obj)
6710 {
6711         obj = yaffs_GetEquivalentObject(obj);
6712
6713         return obj->objectId;
6714 }
6715
6716 unsigned yaffs_GetObjectType(yaffs_Object * obj)
6717 {
6718         obj = yaffs_GetEquivalentObject(obj);
6719
6720         switch (obj->variantType) {
6721         case YAFFS_OBJECT_TYPE_FILE:
6722                 return DT_REG;
6723                 break;
6724         case YAFFS_OBJECT_TYPE_DIRECTORY:
6725                 return DT_DIR;
6726                 break;
6727         case YAFFS_OBJECT_TYPE_SYMLINK:
6728                 return DT_LNK;
6729                 break;
6730         case YAFFS_OBJECT_TYPE_HARDLINK:
6731                 return DT_REG;
6732                 break;
6733         case YAFFS_OBJECT_TYPE_SPECIAL:
6734                 if (S_ISFIFO(obj->yst_mode))
6735                         return DT_FIFO;
6736                 if (S_ISCHR(obj->yst_mode))
6737                         return DT_CHR;
6738                 if (S_ISBLK(obj->yst_mode))
6739                         return DT_BLK;
6740                 if (S_ISSOCK(obj->yst_mode))
6741                         return DT_SOCK;
6742         default:
6743                 return DT_REG;
6744                 break;
6745         }
6746 }
6747
6748 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
6749 {
6750         obj = yaffs_GetEquivalentObject(obj);
6751         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6752                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
6753         } else {
6754                 return yaffs_CloneString(_Y(""));
6755         }
6756 }
6757
6758 #ifndef CONFIG_YAFFS_WINCE
6759
6760 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
6761 {
6762         unsigned int valid = attr->ia_valid;
6763
6764         if (valid & ATTR_MODE)
6765                 obj->yst_mode = attr->ia_mode;
6766         if (valid & ATTR_UID)
6767                 obj->yst_uid = attr->ia_uid;
6768         if (valid & ATTR_GID)
6769                 obj->yst_gid = attr->ia_gid;
6770
6771         if (valid & ATTR_ATIME)
6772                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
6773         if (valid & ATTR_CTIME)
6774                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
6775         if (valid & ATTR_MTIME)
6776                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
6777
6778         if (valid & ATTR_SIZE)
6779                 yaffs_ResizeFile(obj, attr->ia_size);
6780
6781         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6782
6783         return YAFFS_OK;
6784
6785 }
6786 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
6787 {
6788         unsigned int valid = 0;
6789
6790         attr->ia_mode = obj->yst_mode;
6791         valid |= ATTR_MODE;
6792         attr->ia_uid = obj->yst_uid;
6793         valid |= ATTR_UID;
6794         attr->ia_gid = obj->yst_gid;
6795         valid |= ATTR_GID;
6796
6797         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
6798         valid |= ATTR_ATIME;
6799         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
6800         valid |= ATTR_CTIME;
6801         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
6802         valid |= ATTR_MTIME;
6803
6804         attr->ia_size = yaffs_GetFileSize(obj);
6805         valid |= ATTR_SIZE;
6806
6807         attr->ia_valid = valid;
6808
6809         return YAFFS_OK;
6810
6811 }
6812
6813 #endif
6814
6815 #if 0
6816 int yaffs_DumpObject(yaffs_Object * obj)
6817 {
6818         YCHAR name[257];
6819
6820         yaffs_GetObjectName(obj, name, 256);
6821
6822         T(YAFFS_TRACE_ALWAYS,
6823           (TSTR
6824            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
6825             " chunk %d type %d size %d\n"
6826             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
6827            obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
6828            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
6829
6830         return YAFFS_OK;
6831 }
6832 #endif
6833
6834 /*---------------------------- Initialisation code -------------------------------------- */
6835
6836 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
6837 {
6838
6839         /* Common functions, gotta have */
6840         if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
6841                 return 0;
6842
6843 #ifdef CONFIG_YAFFS_YAFFS2
6844
6845         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
6846         if (dev->writeChunkWithTagsToNAND &&
6847             dev->readChunkWithTagsFromNAND &&
6848             !dev->writeChunkToNAND &&
6849             !dev->readChunkFromNAND &&
6850             dev->markNANDBlockBad && dev->queryNANDBlock)
6851                 return 1;
6852 #endif
6853
6854         /* Can use the "spare" style interface for yaffs1 */
6855         if (!dev->isYaffs2 &&
6856             !dev->writeChunkWithTagsToNAND &&
6857             !dev->readChunkWithTagsFromNAND &&
6858             dev->writeChunkToNAND &&
6859             dev->readChunkFromNAND &&
6860             !dev->markNANDBlockBad && !dev->queryNANDBlock)
6861                 return 1;
6862
6863         return 0;               /* bad */
6864 }
6865
6866
6867 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
6868 {
6869         /* Initialise the unlinked, deleted, root and lost and found directories */
6870
6871         dev->lostNFoundDir = dev->rootDir =  NULL;
6872         dev->unlinkedDir = dev->deletedDir = NULL;
6873
6874         dev->unlinkedDir =
6875             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
6876
6877         dev->deletedDir =
6878             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
6879
6880         dev->rootDir =
6881             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
6882                                       YAFFS_ROOT_MODE | S_IFDIR);
6883         dev->lostNFoundDir =
6884             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
6885                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
6886
6887         if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
6888                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
6889                 return YAFFS_OK;
6890         }
6891
6892         return YAFFS_FAIL;
6893 }
6894
6895 int yaffs_GutsInitialise(yaffs_Device * dev)
6896 {
6897         int init_failed = 0;
6898         unsigned x;
6899         int bits;
6900
6901         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
6902
6903         /* Check stuff that must be set */
6904
6905         if (!dev) {
6906                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
6907                 return YAFFS_FAIL;
6908         }
6909
6910         dev->internalStartBlock = dev->startBlock;
6911         dev->internalEndBlock = dev->endBlock;
6912         dev->blockOffset = 0;
6913         dev->chunkOffset = 0;
6914         dev->nFreeChunks = 0;
6915
6916         if (dev->startBlock == 0) {
6917                 dev->internalStartBlock = dev->startBlock + 1;
6918                 dev->internalEndBlock = dev->endBlock + 1;
6919                 dev->blockOffset = 1;
6920                 dev->chunkOffset = dev->nChunksPerBlock;
6921         }
6922
6923         /* Check geometry parameters. */
6924
6925         if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
6926             (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
6927              dev->nChunksPerBlock < 2 ||
6928              dev->nReservedBlocks < 2 ||
6929              dev->internalStartBlock <= 0 ||
6930              dev->internalEndBlock <= 0 ||
6931              dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)      // otherwise it is too small
6932             ) {
6933                 T(YAFFS_TRACE_ALWAYS,
6934                   (TSTR
6935                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
6936                     TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
6937                 return YAFFS_FAIL;
6938         }
6939
6940         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
6941                 T(YAFFS_TRACE_ALWAYS,
6942                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
6943                 return YAFFS_FAIL;
6944         }
6945
6946         /* Got the right mix of functions? */
6947         if (!yaffs_CheckDevFunctions(dev)) {
6948                 /* Function missing */
6949                 T(YAFFS_TRACE_ALWAYS,
6950                   (TSTR
6951                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
6952
6953                 return YAFFS_FAIL;
6954         }
6955
6956         /* This is really a compilation check. */
6957         if (!yaffs_CheckStructures()) {
6958                 T(YAFFS_TRACE_ALWAYS,
6959                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
6960                 return YAFFS_FAIL;
6961         }
6962
6963         if (dev->isMounted) {
6964                 T(YAFFS_TRACE_ALWAYS,
6965                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
6966                 return YAFFS_FAIL;
6967         }
6968
6969         /* Finished with most checks. One or two more checks happen later on too. */
6970
6971         dev->isMounted = 1;
6972
6973
6974
6975         /* OK now calculate a few things for the device */
6976
6977         /*
6978          *  Calculate all the chunk size manipulation numbers:
6979          */
6980          /* Start off assuming it is a power of 2 */
6981          dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
6982          dev->chunkMask = (1<<dev->chunkShift) - 1;
6983
6984          if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
6985                 /* Yes it is a power of 2, disable crumbs */
6986                 dev->crumbMask = 0;
6987                 dev->crumbShift = 0;
6988                 dev->crumbsPerChunk = 0;
6989          } else {
6990                 /* Not a power of 2, use crumbs instead */
6991                 dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
6992                 dev->crumbMask = (1<<dev->crumbShift)-1;
6993                 dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
6994                 dev->chunkShift = 0;
6995                 dev->chunkMask = 0;
6996         }
6997
6998
6999         /*
7000          * Calculate chunkGroupBits.
7001          * We need to find the next power of 2 > than internalEndBlock
7002          */
7003
7004         x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7005
7006         bits = ShiftsGE(x);
7007
7008         /* Set up tnode width if wide tnodes are enabled. */
7009         if(!dev->wideTnodesDisabled){
7010                 /* bits must be even so that we end up with 32-bit words */
7011                 if(bits & 1)
7012                         bits++;
7013                 if(bits < 16)
7014                         dev->tnodeWidth = 16;
7015                 else
7016                         dev->tnodeWidth = bits;
7017         }
7018         else
7019                 dev->tnodeWidth = 16;
7020
7021         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7022
7023         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7024          * so if the bitwidth of the
7025          * chunk range we're using is greater than 16 we need
7026          * to figure out chunk shift and chunkGroupSize
7027          */
7028
7029         if (bits <= dev->tnodeWidth)
7030                 dev->chunkGroupBits = 0;
7031         else
7032                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7033
7034
7035         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7036
7037         if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7038                 /* We have a problem because the soft delete won't work if
7039                  * the chunk group size > chunks per block.
7040                  * This can be remedied by using larger "virtual blocks".
7041                  */
7042                 T(YAFFS_TRACE_ALWAYS,
7043                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7044
7045                 return YAFFS_FAIL;
7046         }
7047
7048         /* OK, we've finished verifying the device, lets continue with initialisation */
7049
7050         /* More device initialisation */
7051         dev->garbageCollections = 0;
7052         dev->passiveGarbageCollections = 0;
7053         dev->currentDirtyChecker = 0;
7054         dev->bufferedBlock = -1;
7055         dev->doingBufferedBlockRewrite = 0;
7056         dev->nDeletedFiles = 0;
7057         dev->nBackgroundDeletions = 0;
7058         dev->nUnlinkedFiles = 0;
7059         dev->eccFixed = 0;
7060         dev->eccUnfixed = 0;
7061         dev->tagsEccFixed = 0;
7062         dev->tagsEccUnfixed = 0;
7063         dev->nErasureFailures = 0;
7064         dev->nErasedBlocks = 0;
7065         dev->isDoingGC = 0;
7066         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7067
7068         /* Initialise temporary buffers and caches. */
7069         if(!yaffs_InitialiseTempBuffers(dev))
7070                 init_failed = 1;
7071
7072         dev->srCache = NULL;
7073         dev->gcCleanupList = NULL;
7074
7075
7076         if (!init_failed &&
7077             dev->nShortOpCaches > 0) {
7078                 int i;
7079                 __u8 *buf;
7080                 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7081
7082                 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
7083                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7084                 }
7085
7086                 dev->srCache = YMALLOC(srCacheBytes);
7087                 buf = (__u8 *)dev->srCache;
7088
7089                 if(dev->srCache)
7090                         memset(dev->srCache,0,srCacheBytes);
7091
7092                 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7093                         dev->srCache[i].object = NULL;
7094                         dev->srCache[i].lastUse = 0;
7095                         dev->srCache[i].dirty = 0;
7096                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
7097                 }
7098                 if(!buf)
7099                         init_failed = 1;
7100
7101                 dev->srLastUse = 0;
7102         }
7103
7104         dev->cacheHits = 0;
7105
7106         if(!init_failed){
7107                 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7108                 if(!dev->gcCleanupList)
7109                         init_failed = 1;
7110         }
7111
7112         if (dev->isYaffs2) {
7113                 dev->useHeaderFileSize = 1;
7114         }
7115         if(!init_failed && !yaffs_InitialiseBlocks(dev))
7116                 init_failed = 1;
7117
7118         yaffs_InitialiseTnodes(dev);
7119         yaffs_InitialiseObjects(dev);
7120
7121         if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7122                 init_failed = 1;
7123
7124
7125         if(!init_failed){
7126                 /* Now scan the flash. */
7127                 if (dev->isYaffs2) {
7128                         if(yaffs_CheckpointRestore(dev)) {
7129                                 T(YAFFS_TRACE_ALWAYS,
7130                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7131                         } else {
7132
7133                                 /* Clean up the mess caused by an aborted checkpoint load
7134                                  * and scan backwards.
7135                                  */
7136                                 yaffs_DeinitialiseBlocks(dev);
7137                                 yaffs_DeinitialiseTnodes(dev);
7138                                 yaffs_DeinitialiseObjects(dev);
7139
7140
7141                                 dev->nErasedBlocks = 0;
7142                                 dev->nFreeChunks = 0;
7143                                 dev->allocationBlock = -1;
7144                                 dev->allocationPage = -1;
7145                                 dev->nDeletedFiles = 0;
7146                                 dev->nUnlinkedFiles = 0;
7147                                 dev->nBackgroundDeletions = 0;
7148                                 dev->oldestDirtySequence = 0;
7149
7150                                 if(!init_failed && !yaffs_InitialiseBlocks(dev))
7151                                         init_failed = 1;
7152
7153                                 yaffs_InitialiseTnodes(dev);
7154                                 yaffs_InitialiseObjects(dev);
7155
7156                                 if(!init_failed && !yaffs_CreateInitialDirectories(dev))
7157                                         init_failed = 1;
7158
7159                                 if(!init_failed && !yaffs_ScanBackwards(dev))
7160                                         init_failed = 1;
7161                         }
7162                 }else
7163                         if(!yaffs_Scan(dev))
7164                                 init_failed = 1;
7165         }
7166
7167         if(init_failed){
7168                 /* Clean up the mess */
7169                 T(YAFFS_TRACE_TRACING,
7170                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7171
7172                 yaffs_Deinitialise(dev);
7173                 return YAFFS_FAIL;
7174         }
7175
7176         /* Zero out stats */
7177         dev->nPageReads = 0;
7178         dev->nPageWrites = 0;
7179         dev->nBlockErasures = 0;
7180         dev->nGCCopies = 0;
7181         dev->nRetriedWrites = 0;
7182
7183         dev->nRetiredBlocks = 0;
7184
7185         yaffs_VerifyFreeChunks(dev);
7186         yaffs_VerifyBlocks(dev);
7187
7188
7189         T(YAFFS_TRACE_TRACING,
7190           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7191         return YAFFS_OK;
7192
7193 }
7194
7195 void yaffs_Deinitialise(yaffs_Device * dev)
7196 {
7197         if (dev->isMounted) {
7198                 int i;
7199
7200                 yaffs_DeinitialiseBlocks(dev);
7201                 yaffs_DeinitialiseTnodes(dev);
7202                 yaffs_DeinitialiseObjects(dev);
7203                 if (dev->nShortOpCaches > 0 &&
7204                     dev->srCache) {
7205
7206                         for (i = 0; i < dev->nShortOpCaches; i++) {
7207                                 if(dev->srCache[i].data)
7208                                         YFREE(dev->srCache[i].data);
7209                                 dev->srCache[i].data = NULL;
7210                         }
7211
7212                         YFREE(dev->srCache);
7213                         dev->srCache = NULL;
7214                 }
7215
7216                 YFREE(dev->gcCleanupList);
7217
7218                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
7219                         YFREE(dev->tempBuffer[i].buffer);
7220                 }
7221
7222                 dev->isMounted = 0;
7223         }
7224
7225 }
7226
7227 static int yaffs_CountFreeChunks(yaffs_Device * dev)
7228 {
7229         int nFree;
7230         int b;
7231
7232         yaffs_BlockInfo *blk;
7233
7234         for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7235              b++) {
7236                 blk = yaffs_GetBlockInfo(dev, b);
7237
7238                 switch (blk->blockState) {
7239                 case YAFFS_BLOCK_STATE_EMPTY:
7240                 case YAFFS_BLOCK_STATE_ALLOCATING:
7241                 case YAFFS_BLOCK_STATE_COLLECTING:
7242                 case YAFFS_BLOCK_STATE_FULL:
7243                         nFree +=
7244                             (dev->nChunksPerBlock - blk->pagesInUse +
7245                              blk->softDeletions);
7246                         break;
7247                 default:
7248                         break;
7249                 }
7250
7251         }
7252
7253         return nFree;
7254 }
7255
7256 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
7257 {
7258         /* This is what we report to the outside world */
7259
7260         int nFree;
7261         int nDirtyCacheChunks;
7262         int blocksForCheckpoint;
7263
7264 #if 1
7265         nFree = dev->nFreeChunks;
7266 #else
7267         nFree = yaffs_CountFreeChunks(dev);
7268 #endif
7269
7270         nFree += dev->nDeletedFiles;
7271
7272         /* Now count the number of dirty chunks in the cache and subtract those */
7273
7274         {
7275                 int i;
7276                 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7277                         if (dev->srCache[i].dirty)
7278                                 nDirtyCacheChunks++;
7279                 }
7280         }
7281
7282         nFree -= nDirtyCacheChunks;
7283
7284         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7285
7286         /* Now we figure out how much to reserve for the checkpoint and report that... */
7287         blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
7288         if(blocksForCheckpoint < 0)
7289                 blocksForCheckpoint = 0;
7290
7291         nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7292
7293         if (nFree < 0)
7294                 nFree = 0;
7295
7296         return nFree;
7297
7298 }
7299
7300 static int yaffs_freeVerificationFailures;
7301
7302 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
7303 {
7304         int counted;
7305         int difference;
7306
7307         if(yaffs_SkipVerification(dev))
7308                 return;
7309
7310         counted = yaffs_CountFreeChunks(dev);
7311
7312         difference = dev->nFreeChunks - counted;
7313
7314         if (difference) {
7315                 T(YAFFS_TRACE_ALWAYS,
7316                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7317                    dev->nFreeChunks, counted, difference));
7318                 yaffs_freeVerificationFailures++;
7319         }
7320 }
7321
7322 /*---------------------------------------- YAFFS test code ----------------------*/
7323
7324 #define yaffs_CheckStruct(structure,syze, name) \
7325            if(sizeof(structure) != syze) \
7326                { \
7327                  T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
7328                  name,syze,sizeof(structure))); \
7329                  return YAFFS_FAIL; \
7330                 }
7331
7332 static int yaffs_CheckStructures(void)
7333 {
7334 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
7335 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
7336 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
7337 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7338         yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
7339 #endif
7340             yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
7341
7342             return YAFFS_OK;
7343 }