yaffs_guts.c

   1
   2 /*
   3  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   6  *   for Toby Churchill Ltd and Brightstar Engineering
   7  *
   8  * Created by Charles Manning <charles@aleph1.co.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15  //yaffs_guts.c
  16
  17 const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.9 2005-07-18 23:16:04 charles Exp $";
  18
  19 #include "yportenv.h"
  20
  21 #include "yaffsinterface.h"
  22 #include "yaffs_guts.h"
  23 #include "yaffs_tagsvalidity.h"
  24
  25
  26 #include "yaffs_tagscompat.h"
  27
  28 #ifdef CONFIG_YAFFS_WINCE
  29 void yfsd_LockYAFFS(BOOL fsLockOnly);
  30 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
  31 #endif
  32
  33 #define YAFFS_PASSIVE_GC_CHUNKS 2
  34
  35 #if 0
  36 // Use Steven Hill's ECC struff instead
  37 // External functions for ECC on data
  38 void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);
  39 int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);
  40 #define yaffs_ECCCalculate(data,ecc) nand_calculate_ecc(data,ecc)
  41 #define yaffs_ECCCorrect(data,read_ecc,calc_ecc) nand_correct_ecc(data,read_ecc,calc_ecc)
  42 #else
  43 #include "yaffs_ecc.h"
  44 #endif
  45
  46 #if 0
  47 // countBits is a quick way of counting the number of bits in a byte.
  48 // ie. countBits[n] holds the number of 1 bits in a byte with the value n.
  49
  50 static const char yaffs_countBitsTable[256] =
  51 {
  52 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
  53 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  54 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  55 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  56 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  57 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  58 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  59 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  60 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  61 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  62 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  63 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  64 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  65 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  66 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  67 4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
  68 };
  69
  70 static int yaffs_CountBits(__u8 x)
  71 {
  72         int retVal;
  73         retVal = yaffs_countBitsTable[x];
  74         return retVal;
  75 }
  76
  77 #endif
  78
  79
  80 #if 0
  81 // Stuff using yea olde tags
  82 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);
  83 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);
  84
  85 static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);
  86 static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);
  87 #else
  88 #endif
  89
  90 // NAND access
  91
  92
  93 static Y_INLINE int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags);
  94 static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags);
  95 static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo);
  96 static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state,unsigned *sequenceNumber);
  97 // Local prototypes
  98 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve);
  99 #if 0
 100 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);
 101 #endif
 102 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan);
 103
 104 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type);
 105 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj);
 106 static int yaffs_UpdateObjectHeader(yaffs_Object *in,const YCHAR *name, int force,int isShrink);
 107 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
 108 static int yaffs_CheckStructures(void);
 109 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit);
 110 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
 111
 112 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo);
 113
 114 static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo);
 115 static void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo);
 116
 117
 118 // Robustification (if it ever comes about...)
 119 static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);
 120 #if 0
 121 static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
 122 #endif
 123 static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
 124 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags);
 125 static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND,  const yaffs_ExtendedTags *tags);
 126
 127 static int  yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);
 128
 129 static int yaffs_UnlinkWorker(yaffs_Object *obj);
 130 static void yaffs_DestroyObject(yaffs_Object *obj);
 131
 132 #if 0
 133 static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize);
 134 #endif
 135
 136 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject);
 137
 138
 139 loff_t yaffs_GetFileSize(yaffs_Object *obj);
 140
 141
 142 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve);
 143
 144 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
 145
 146 #ifdef YAFFS_PARANOID
 147 static int yaffs_CheckFileSanity(yaffs_Object *in);
 148 #else
 149 #define yaffs_CheckFileSanity(in)
 150 #endif
 151
 152 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 153 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 154
 155 static int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags)
 156 {
 157         chunkInNAND -= dev->chunkOffset;
 158
 159         if(dev->readChunkWithTagsFromNAND)
 160                 return dev->readChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
 161         else
 162                 return yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
 163 }
 164
 165 static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_ExtendedTags *tags)
 166 {
 167         chunkInNAND -= dev->chunkOffset;
 168
 169         if(tags)
 170         {
 171                 tags->sequenceNumber = dev->sequenceNumber;
 172                 tags->chunkUsed = 1;
 173                 if(!yaffs_ValidateTags(tags))
 174                 {
 175                         T(YAFFS_TRACE_ERROR,(TSTR("Writing uninitialised tags" TENDSTR)));
 176                         YBUG();
 177                 }
 178                 T(YAFFS_TRACE_WRITE,(TSTR("Writing chunk %d tags %d %d"TENDSTR),chunkInNAND,tags->objectId,tags->chunkId));
 179         }
 180         else
 181         {
 182                         T(YAFFS_TRACE_ERROR,(TSTR("Writing with no tags" TENDSTR)));
 183                         YBUG();
 184         }
 185
 186         if(dev->writeChunkWithTagsToNAND)
 187                 return dev->writeChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
 188         else
 189                 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
 190 }
 191
 192 static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo)
 193 {
 194         blockNo -= dev->blockOffset;
 195
 196         if(dev->markNANDBlockBad)
 197                 return dev->markNANDBlockBad(dev,blockNo);
 198         else
 199                 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev,blockNo);
 200 }
 201 static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state, unsigned *sequenceNumber)
 202 {
 203         blockNo -= dev->blockOffset;
 204
 205         if(dev->queryNANDBlock)
 206                 return dev->queryNANDBlock(dev,blockNo,state,sequenceNumber);
 207         else
 208                 return yaffs_TagsCompatabilityQueryNANDBlock(dev,blockNo,state,sequenceNumber);
 209 }
 210
 211 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
 212 {
 213         int result;
 214
 215         blockInNAND -= dev->blockOffset;
 216
 217         dev->nBlockErasures++;
 218         result = dev->eraseBlockInNAND(dev,blockInNAND);
 219
 220         if(!result)result = dev->eraseBlockInNAND(dev,blockInNAND); // If at first we don't succeed, try again *once*.
 221         return result;
 222 }
 223
 224 static int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 225 {
 226         return dev->initialiseNAND(dev);
 227 }
 228
 229
 230
 231
 232 // Temporary buffer manipulations
 233
 234 static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo)
 235 {
 236         int i,j;
 237         for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
 238         {
 239                 if(dev->tempBuffer[i].line == 0)
 240                 {
 241                         dev->tempBuffer[i].line = lineNo;
 242                         if((i+1) > dev->maxTemp)
 243                         {
 244                                 dev->maxTemp = i + 1;
 245                                 for(j = 0; j <= i; j++)
 246                                         dev->tempBuffer[j].maxLine = dev->tempBuffer[j].line;
 247                         }
 248
 249                         return dev->tempBuffer[i].buffer;
 250                 }
 251         }
 252
 253         T(YAFFS_TRACE_BUFFERS,(TSTR("Out of temp buffers at line %d, other held by lines:"),lineNo));
 254         for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
 255         {
 256                 T(YAFFS_TRACE_BUFFERS,(TSTR(" %d "),dev->tempBuffer[i].line));
 257         }
 258         T(YAFFS_TRACE_BUFFERS,(TSTR(" "TENDSTR)));
 259
 260         dev->unmanagedTempAllocations++;
 261         // Get an unmanaged one
 262         return YMALLOC(dev->nBytesPerChunk);
 263
 264
 265 }
 266
 267 static void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo)
 268 {
 269         int i;
 270         for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
 271         {
 272                 if(dev->tempBuffer[i].buffer == buffer)
 273                 {
 274                         dev->tempBuffer[i].line = 0;
 275                         return;
 276                 }
 277         }
 278
 279         if(buffer)
 280         {
 281                 // assume it is an unmanaged one.
 282                 T(YAFFS_TRACE_BUFFERS,(TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),lineNo));
 283                 YFREE(buffer);
 284                 dev->unmanagedTempDeallocations++;
 285         }
 286
 287 }
 288
 289
 290 // Chunk bitmap manipulations
 291
 292 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
 293 {
 294         if(blk < dev->internalStartBlock || blk > dev->internalEndBlock)
 295         {
 296                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),blk));
 297                 YBUG();
 298         }
 299         return dev->chunkBits + (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 300 }
 301
 302 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev,int blk)
 303 {
 304         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 305
 306          memset(blkBits,0,dev->chunkBitmapStride);
 307 }
 308
 309 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev,int blk,int chunk)
 310 {
 311         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 312
 313         blkBits[chunk/8] &=  ~ (1<<(chunk & 7));
 314 }
 315
 316 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev,int blk,int chunk)
 317 {
 318         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 319
 320         blkBits[chunk/8] |=   (1<<(chunk & 7));
 321 }
 322
 323 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev,int blk,int chunk)
 324 {
 325         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 326         return (blkBits[chunk/8] &  (1<<(chunk & 7))) ? 1 :0;
 327 }
 328
 329 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev,int blk)
 330 {
 331         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 332         int i;
 333         for(i = 0; i < dev->chunkBitmapStride; i++)
 334         {
 335                 if(*blkBits) return 1;
 336                 blkBits++;
 337         }
 338         return 0;
 339 }
 340
 341
 342 static  Y_INLINE int yaffs_HashFunction(int n)
 343 {
 344         return (n % YAFFS_NOBJECT_BUCKETS);
 345 }
 346
 347
 348 yaffs_Object *yaffs_Root(yaffs_Device *dev)
 349 {
 350         return dev->rootDir;
 351 }
 352
 353 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 354 {
 355         return dev->lostNFoundDir;
 356 }
 357
 358
 359
 360
 361 int yaffs_CheckFF(__u8 *buffer,int nBytes)
 362 {
 363         //Horrible, slow implementation
 364         while(nBytes--)
 365         {
 366                 if(*buffer != 0xFF) return 0;
 367                 buffer++;
 368         }
 369         return 1;
 370 }
 371
 372 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)
 373 {
 374
 375         int retval = YAFFS_OK;
 376         __u8 *data = yaffs_GetTempBuffer(dev,__LINE__);
 377         yaffs_ExtendedTags tags;
 378
 379 // NCB          dev->readChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
 380         yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
 381
 382         if(!yaffs_CheckFF(data,dev->nBytesPerChunk) || tags.chunkUsed)
 383         {
 384                 T(YAFFS_TRACE_NANDACCESS,(TSTR("Chunk %d not erased" TENDSTR),chunkInNAND));
 385                 retval = YAFFS_FAIL;
 386         }
 387
 388         yaffs_ReleaseTempBuffer(dev,data,__LINE__);
 389
 390         return retval;
 391
 392 }
 393
 394
 395
 396 #if 1
 397 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_ExtendedTags *tags,int useReserve)
 398 {
 399         int chunk;
 400
 401         int writeOk = 1;
 402         int attempts = 0;
 403
 404
 405
 406         do{
 407                 chunk = yaffs_AllocateChunk(dev,useReserve);
 408
 409                 if(chunk >= 0)
 410                 {
 411
 412                         // First check this chunk is erased...
 413 #ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
 414                         writeOk = yaffs_CheckChunkErased(dev,chunk);
 415 #endif
 416                         if(!writeOk)
 417                         {
 418                                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
 419                         }
 420                         else
 421                         {
 422                                 writeOk =  yaffs_WriteChunkWithTagsToNAND(dev,chunk,data,tags);
 423                         }
 424                         attempts++;
 425
 426                         if(writeOk)
 427                         {
 428                                 // Copy the data into the robustification buffer.
 429                                 // NB We do this at the end to prevent duplicates in the case of a write error.
 430                                 //Todo
 431                                 yaffs_HandleWriteChunkOk(dev,chunk,data,tags);
 432                         }
 433                         else
 434                         {
 435                                 yaffs_HandleWriteChunkError(dev,chunk);
 436                         }
 437                 }
 438
 439         } while(chunk >= 0 && ! writeOk);
 440
 441         if(attempts > 1)
 442         {
 443                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
 444                 dev->nRetriedWrites+= (attempts - 1);
 445         }
 446
 447
 448
 449         return chunk;
 450 }
 451 #endif
 452
 453
 454 ///
 455 // Functions for robustisizing
 456 //
 457 //
 458
 459 static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
 460 {
 461
 462         yaffs_MarkBlockBad(dev,blockInNAND);
 463
 464         yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
 465
 466         dev->nRetiredBlocks++;
 467 }
 468
 469
 470 #if 0
 471 static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
 472 {
 473         dev->doingBufferedBlockRewrite = 1;
 474         //
 475         //      Remove erased chunks
 476         //  Rewrite existing chunks to a new block
 477         //      Set current write block to the new block
 478
 479         dev->doingBufferedBlockRewrite = 0;
 480
 481         return 1;
 482 }
 483
 484
 485 static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
 486 {
 487         int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
 488
 489         // Mark the block for retirement
 490         yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
 491         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
 492
 493
 494         //TODO
 495         // Just do a garbage collection on the affected block then retire the block
 496         // NB recursion
 497 }
 498
 499
 500 static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
 501 {
 502 }
 503
 504 #endif
 505
 506 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
 507 {
 508 }
 509
 510 static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_ExtendedTags *tags)
 511 {
 512 }
 513
 514 static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
 515 {
 516         int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
 517
 518         // Mark the block for retirement
 519         yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
 520         // Delete the chunk
 521         yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
 522 }
 523
 524
 525
 526 #if 0
 527 static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize)
 528 {
 529
 530
 531         if( memcmp(d0,d1,dataSize) != 0 ||
 532                 s0->tagByte0 != s1->tagByte0 ||
 533                 s0->tagByte1 != s1->tagByte1 ||
 534                 s0->tagByte2 != s1->tagByte2 ||
 535                 s0->tagByte3 != s1->tagByte3 ||
 536                 s0->tagByte4 != s1->tagByte4 ||
 537                 s0->tagByte5 != s1->tagByte5 ||
 538                 s0->tagByte6 != s1->tagByte6 ||
 539                 s0->tagByte7 != s1->tagByte7 ||
 540                 s0->ecc1[0]  != s1->ecc1[0]  ||
 541                 s0->ecc1[1]  != s1->ecc1[1]  ||
 542                 s0->ecc1[2]  != s1->ecc1[2]  ||
 543                 s0->ecc2[0]  != s1->ecc2[0]  ||
 544                 s0->ecc2[1]  != s1->ecc2[1]  ||
 545                 s0->ecc2[2]  != s1->ecc2[2] )
 546                 {
 547                         return 0;
 548                 }
 549
 550         return 1;
 551 }
 552 #endif
 553
 554
 555 ///////////////////////// Object management //////////////////
 556 // List of spare objects
 557 // The list is hooked together using the first pointer
 558 // in the object
 559
 560 // static yaffs_Object *yaffs_freeObjects = NULL;
 561
 562 // static int yaffs_nFreeObjects;
 563
 564 // static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;
 565
 566 // static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];
 567
 568
 569 static __u16 yaffs_CalcNameSum(const YCHAR *name)
 570 {
 571         __u16 sum = 0;
 572         __u16 i = 1;
 573
 574         YUCHAR *bname = (YUCHAR *)name;
 575         if(bname)
 576         {
 577                 while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))
 578                 {
 579
 580 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
 581                         sum += yaffs_toupper(*bname) * i;
 582 #else
 583                         sum += (*bname) * i;
 584 #endif
 585                         i++;
 586                         bname++;
 587                 }
 588         }
 589         return sum;
 590 }
 591
 592 void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
 593 {
 594 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
 595                                         if(name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
 596                                         {
 597                                                 yaffs_strcpy(obj->shortName,name);
 598                                         }
 599                                         else
 600                                         {
 601                                                 obj->shortName[0]=_Y('\0');
 602                                         }
 603 #endif
 604                                         obj->sum = yaffs_CalcNameSum(name);
 605 }
 606
 607 #if 0
 608 void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
 609 {
 610         yaffs_ECCCalculate(data , spare->ecc1);
 611         yaffs_ECCCalculate(&data[256] , spare->ecc2);
 612 }
 613 #endif
 614
 615
 616 ///////////////////////// TNODES ///////////////////////
 617
 618 // List of spare tnodes
 619 // The list is hooked together using the first pointer
 620 // in the tnode.
 621
 622 //static yaffs_Tnode *yaffs_freeTnodes = NULL;
 623
 624 // static int yaffs_nFreeTnodes;
 625
 626 //static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;
 627
 628
 629
 630 // yaffs_CreateTnodes creates a bunch more tnodes and
 631 // adds them to the tnode free list.
 632 // Don't use this function directly
 633
 634 static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes)
 635 {
 636     int i;
 637     yaffs_Tnode *newTnodes;
 638     yaffs_TnodeList *tnl;
 639
 640     if(nTnodes < 1) return YAFFS_OK;
 641
 642         // make these things
 643
 644     newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
 645
 646     if (!newTnodes)
 647     {
 648                 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));
 649                 return YAFFS_FAIL;
 650     }
 651
 652     // Hook them into the free list
 653     for(i = 0; i < nTnodes - 1; i++)
 654     {
 655         newTnodes[i].internal[0] = &newTnodes[i+1];
 656 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 657         newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = 1;
 658 #endif
 659     }
 660
 661         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
 662 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 663         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = 1;
 664 #endif
 665         dev->freeTnodes = newTnodes;
 666         dev->nFreeTnodes+= nTnodes;
 667         dev->nTnodesCreated += nTnodes;
 668
 669         // Now add this bunch of tnodes to a list for freeing up.
 670         // NB If we can't add this to the management list it isn't fatal
 671         // but it just means we can't free this bunch of tnodes later.
 672         tnl = YMALLOC(sizeof(yaffs_TnodeList));
 673         if(!tnl)
 674         {
 675                 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR)));
 676
 677         }
 678         else
 679         {
 680                 tnl->tnodes = newTnodes;
 681                 tnl->next = dev->allocatedTnodeList;
 682                 dev->allocatedTnodeList = tnl;
 683         }
 684
 685
 686         T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));
 687
 688
 689         return YAFFS_OK;
 690 }
 691
 692
 693 // GetTnode gets us a clean tnode. Tries to make allocate more if we run out
 694 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
 695 {
 696         yaffs_Tnode *tn = NULL;
 697
 698         // If there are none left make more
 699         if(!dev->freeTnodes)
 700         {
 701                 yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES);
 702         }
 703
 704         if(dev->freeTnodes)
 705         {
 706                 tn = dev->freeTnodes;
 707 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 708         if(tn->internal[YAFFS_NTNODES_INTERNAL] != 1)
 709                 {
 710                         // Hoosterman, this thing looks like it isn't in the list
 711                                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 1" TENDSTR)));
 712                 }
 713 #endif
 714                 dev->freeTnodes = dev->freeTnodes->internal[0];
 715                 dev->nFreeTnodes--;
 716                 // zero out
 717                 memset(tn,0,sizeof(yaffs_Tnode));
 718         }
 719
 720
 721         return tn;
 722 }
 723
 724
 725 // FreeTnode frees up a tnode and puts it back on the free list
 726 static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn)
 727 {
 728         if(tn)
 729         {
 730 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 731         if(tn->internal[YAFFS_NTNODES_INTERNAL] != 0)
 732                 {
 733                         // Hoosterman, this thing looks like it is already in the list
 734                                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 2" TENDSTR)));
 735                 }
 736                 tn->internal[YAFFS_NTNODES_INTERNAL] = 1;
 737 #endif
 738                 tn->internal[0] = dev->freeTnodes;
 739                 dev->freeTnodes = tn;
 740                 dev->nFreeTnodes++;
 741         }
 742 }
 743
 744
 745 static void yaffs_DeinitialiseTnodes(yaffs_Device*dev)
 746 {
 747         // Free the list of allocated tnodes
 748         yaffs_TnodeList *tmp;
 749
 750         while(dev->allocatedTnodeList)
 751         {
 752                 tmp =  dev->allocatedTnodeList->next;
 753
 754                 YFREE(dev->allocatedTnodeList->tnodes);
 755                 YFREE(dev->allocatedTnodeList);
 756                 dev->allocatedTnodeList = tmp;
 757
 758         }
 759
 760         dev->freeTnodes = NULL;
 761         dev->nFreeTnodes = 0;
 762 }
 763
 764 static void yaffs_InitialiseTnodes(yaffs_Device*dev)
 765 {
 766         dev->allocatedTnodeList = NULL;
 767         dev->freeTnodes = NULL;
 768         dev->nFreeTnodes = 0;
 769         dev->nTnodesCreated = 0;
 770
 771 }
 772
 773 #if 0
 774 void yaffs_TnodeTest(yaffs_Device *dev)
 775 {
 776
 777         int i;
 778         int j;
 779         yaffs_Tnode *tn[1000];
 780
 781         YINFO("Testing TNodes");
 782
 783         for(j = 0; j < 50; j++)
 784         {
 785                 for(i = 0; i < 1000; i++)
 786                 {
 787                         tn[i] = yaffs_GetTnode(dev);
 788                         if(!tn[i])
 789                         {
 790                                 YALERT("Getting tnode failed");
 791                         }
 792                 }
 793                 for(i = 0; i < 1000; i+=3)
 794                 {
 795                         yaffs_FreeTnode(dev,tn[i]);
 796                         tn[i] = NULL;
 797                 }
 798
 799         }
 800 }
 801 #endif
 802
 803
 804 ////////////////// END OF TNODE MANIPULATION ///////////////////////////
 805
 806 /////////////// Functions to manipulate the look-up tree (made up of tnodes)
 807 // The look up tree is represented by the top tnode and the number of topLevel
 808 // in the tree. 0 means only the level 0 tnode is in the tree.
 809
 810
 811 // FindLevel0Tnode finds the level 0 tnode, if one exists.
 812 // Used when reading.....
 813 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId)
 814 {
 815
 816         yaffs_Tnode *tn = fStruct->top;
 817         __u32 i;
 818         int requiredTallness;
 819         int level = fStruct->topLevel;
 820
 821         // Check sane level and chunk Id
 822         if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
 823         {
 824 //              char str[50];
 825 //              sprintf(str,"Bad level %d",level);
 826 //              YALERT(str);
 827                 return NULL;
 828         }
 829
 830         if(chunkId > YAFFS_MAX_CHUNK_ID)
 831         {
 832 //              char str[50];
 833 //              sprintf(str,"Bad chunkId %d",chunkId);
 834 //              YALERT(str);
 835                 return NULL;
 836         }
 837
 838         // First check we're tall enough (ie enough topLevel)
 839
 840         i = chunkId >> (/*dev->chunkGroupBits  + */YAFFS_TNODES_LEVEL0_BITS);
 841         requiredTallness = 0;
 842         while(i)
 843         {
 844                 i >>= YAFFS_TNODES_INTERNAL_BITS;
 845                 requiredTallness++;
 846         }
 847
 848
 849         if(requiredTallness > fStruct->topLevel)
 850         {
 851                 // Not tall enough, so we can't find it, return NULL.
 852                 return NULL;
 853         }
 854
 855
 856         // Traverse down to level 0
 857         while (level > 0 && tn)
 858         {
 859             tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) &
 860                                YAFFS_TNODES_INTERNAL_MASK];
 861                 level--;
 862
 863         }
 864
 865         return tn;
 866 }
 867
 868 // AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
 869 // This happens in two steps:
 870 //  1. If the tree isn't tall enough, then make it taller.
 871 //  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
 872 //
 873 // Used when modifying the tree.
 874 //
 875 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
 876 {
 877
 878         yaffs_Tnode *tn;
 879
 880         int requiredTallness;
 881         int i;
 882         int l;
 883
 884         __u32 x;
 885
 886
 887         //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
 888
 889         // Check sane level and page Id
 890         if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
 891         {
 892 //              char str[50];
 893 //              sprintf(str,"Bad level %d",fStruct->topLevel);
 894 //              YALERT(str);
 895                 return NULL;
 896         }
 897
 898         if(chunkId > YAFFS_MAX_CHUNK_ID)
 899         {
 900 //              char str[50];
 901 //              sprintf(str,"Bad chunkId %d",chunkId);
 902 //              YALERT(str);
 903                 return NULL;
 904         }
 905
 906         // First check we're tall enough (ie enough topLevel)
 907
 908         x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
 909         requiredTallness = 0;
 910         while(x)
 911         {
 912                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 913                 requiredTallness++;
 914         }
 915
 916         //T((TSTR(" required=%d"),requiredTallness));
 917
 918
 919         if(requiredTallness > fStruct->topLevel)
 920         {
 921                 // Not tall enough,gotta make the tree taller
 922                 for(i = fStruct->topLevel; i < requiredTallness; i++)
 923                 {
 924                         //T((TSTR(" add new top")));
 925
 926                         tn = yaffs_GetTnode(dev);
 927
 928                         if(tn)
 929                         {
 930                                 tn->internal[0] = fStruct->top;
 931                                 fStruct->top = tn;
 932                         }
 933                         else
 934                         {
 935                                         T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));
 936                         }
 937                 }
 938
 939                 fStruct->topLevel = requiredTallness;
 940         }
 941
 942
 943         // Traverse down to level 0, adding anything we need
 944
 945         l = fStruct->topLevel;
 946         tn = fStruct->top;
 947         while (l > 0 && tn)
 948         {
 949                 x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
 950                                YAFFS_TNODES_INTERNAL_MASK;
 951
 952                 //T((TSTR(" [%d:%d]"),l,i));
 953
 954             if(!tn->internal[x])
 955             {
 956                 //T((TSTR(" added")));
 957
 958                 tn->internal[x] = yaffs_GetTnode(dev);
 959             }
 960
 961             tn =        tn->internal[x];
 962                 l--;
 963
 964         }
 965
 966         //TSTR(TENDSTR)));
 967
 968         return tn;
 969 }
 970
 971
 972 int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk, yaffs_ExtendedTags *tags, int objectId, int chunkInInode)
 973 {
 974         int j;
 975
 976
 977         for(j = 0; theChunk && j < dev->chunkGroupSize; j++)
 978         {
 979                 if(yaffs_CheckChunkBit(dev,theChunk / dev->nChunksPerBlock,theChunk % dev->nChunksPerBlock))
 980                 {
 981                         yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL,tags);
 982                         if(yaffs_TagsMatch(tags,objectId,chunkInInode))
 983                         {
 984                                 // found it;
 985                                 return theChunk;
 986
 987                         }
 988                 }
 989                 theChunk++;
 990         }
 991         return -1;
 992 }
 993
 994 // DeleteWorker scans backwards through the tnode tree and deletes all the
 995 // chunks and tnodes in the file
 996 // Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
 997
 998 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit)
 999 {
1000         int i;
1001         int chunkInInode;
1002         int theChunk;
1003         yaffs_ExtendedTags tags;
1004         int foundChunk;
1005         yaffs_Device *dev = in->myDev;
1006
1007         int allDone = 1;
1008
1009
1010         if(tn)
1011         {
1012                 if(level > 0)
1013                 {
1014
1015                         for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1016                         {
1017                             if(tn->internal[i])
1018                         {
1019                                         if(limit && (*limit) < 0)
1020                                         {
1021                                                 allDone = 0;
1022                                         }
1023                                         else
1024                                         {
1025                                                 allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1,
1026                                                                                 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit);
1027                                         }
1028                                         if(allDone)
1029                                         {
1030                                                 yaffs_FreeTnode(dev,tn->internal[i]);
1031                                         tn->internal[i] = NULL;
1032                                         }
1033                             }
1034
1035                         }
1036                         return (allDone) ? 1 : 0;
1037                 }
1038                 else if(level == 0)
1039                 {
1040                         int hitLimit = 0;
1041
1042                         for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0 && !hitLimit; i--)
1043                         {
1044                             if(tn->level0[i])
1045                         {
1046
1047                                         chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
1048
1049                                         theChunk =  tn->level0[i] << dev->chunkGroupBits;
1050
1051                                         foundChunk = yaffs_FindChunkInGroup(dev,theChunk,&tags,in->objectId,chunkInInode);
1052
1053                                         if(foundChunk > 0)
1054                                         {
1055                                                 yaffs_DeleteChunk(dev,foundChunk,1,__LINE__);
1056                                                 in->nDataChunks--;
1057                                                 if(limit)
1058                                                 {
1059                                                         *limit = *limit-1;
1060                                                         if(*limit <= 0)
1061                                                         {
1062                                                                 hitLimit = 1;
1063                                                         }
1064                                                 }
1065
1066                                         }
1067
1068                                 tn->level0[i] = 0;
1069                             }
1070
1071                         }
1072                         return (i < 0) ? 1 : 0;
1073
1074
1075                 }
1076
1077         }
1078
1079         return 1;
1080
1081 }
1082
1083
1084 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1085 {
1086
1087         yaffs_BlockInfo *theBlock;
1088
1089         T(YAFFS_TRACE_DELETION,(TSTR("soft delete chunk %d" TENDSTR),chunk));
1090
1091         theBlock =      yaffs_GetBlockInfo(dev,  chunk/dev->nChunksPerBlock);
1092         if(theBlock)
1093         {
1094                 theBlock->softDeletions++;
1095                 dev->nFreeChunks++;
1096         }
1097 }
1098
1099 // SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1100 // All soft deleting does is increment the block's softdelete count and pulls the chunk out
1101 // of the tnode.
1102 // THus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1103 //
1104 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset)
1105 {
1106         int i;
1107         int theChunk;
1108         int allDone = 1;
1109         yaffs_Device *dev = in->myDev;
1110
1111
1112         if(tn)
1113         {
1114                 if(level > 0)
1115                 {
1116
1117                         for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1118                         {
1119                             if(tn->internal[i])
1120                         {
1121                                                 allDone = yaffs_SoftDeleteWorker(in,tn->internal[i],level - 1,
1122                                                                                 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i);
1123                                         if(allDone)
1124                                         {
1125                                                 yaffs_FreeTnode(dev,tn->internal[i]);
1126                                         tn->internal[i] = NULL;
1127                                         }
1128                                         else
1129                                         {
1130                                                 //Hoosterman... how could this happen.
1131                                         }
1132                                 }
1133                         }
1134                         return (allDone) ? 1 : 0;
1135                 }
1136                 else if(level == 0)
1137                 {
1138
1139                         for(i = YAFFS_NTNODES_LEVEL0 -1; i >=0; i--)
1140                         {
1141                             if(tn->level0[i])
1142                         {
1143                                         // Note this does not find the real chunk, only the chunk group.
1144                                         // We make an assumption that a chunk group is niot larger than a block.
1145                                         theChunk =  (tn->level0[i] << dev->chunkGroupBits);
1146
1147                                         yaffs_SoftDeleteChunk(dev,theChunk);
1148                                 tn->level0[i] = 0;
1149                             }
1150
1151                         }
1152                         return 1;
1153
1154                 }
1155
1156         }
1157
1158         return 1;
1159
1160 }
1161
1162
1163
1164 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1165 {
1166         if(obj->deleted &&
1167            obj->variantType == YAFFS_OBJECT_TYPE_FILE &&
1168            !obj->softDeleted)
1169         {
1170                 if(obj->nDataChunks <= 0)
1171                 {
1172                                 // Empty file with no duplicate object headers, just delete it immediately
1173                                 yaffs_FreeTnode(obj->myDev,obj->variant.fileVariant.top);
1174                                 obj->variant.fileVariant.top = NULL;
1175                                 T(YAFFS_TRACE_TRACING,(TSTR("yaffs: Deleting empty file %d" TENDSTR),obj->objectId));
1176                                 yaffs_DoGenericObjectDeletion(obj);
1177                 }
1178                 else
1179                 {
1180                         yaffs_SoftDeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0);
1181                         obj->softDeleted = 1;
1182                 }
1183         }
1184 }
1185
1186
1187
1188
1189
1190 // Pruning removes any part of the file structure tree that is beyond the
1191 // bounds of the file (ie that does not point to chunks).
1192 //
1193 // A file should only get pruned when its size is reduced.
1194 //
1195 // Before pruning, the chunks must be pulled from the tree and the
1196 // level 0 tnode entries must be zeroed out.
1197 // Could also use this for file deletion, but that's probably better handled
1198 // by a special case.
1199
1200 // yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
1201
1202 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
1203 {
1204         int i;
1205         int hasData;
1206
1207         if(tn)
1208         {
1209                 hasData = 0;
1210
1211                 for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
1212                 {
1213                     if(tn->internal[i] && level > 0)
1214                     {
1215                         tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
1216                     }
1217
1218                     if(tn->internal[i])
1219                     {
1220                         hasData++;
1221                         }
1222                 }
1223
1224                 if(hasData == 0 && del0)
1225                 {
1226                         // Free and return NULL
1227
1228                         yaffs_FreeTnode(dev,tn);
1229                         tn = NULL;
1230                 }
1231
1232         }
1233
1234         return tn;
1235
1236 }
1237
1238 static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)
1239 {
1240         int i;
1241         int hasData;
1242         int done = 0;
1243         yaffs_Tnode *tn;
1244
1245         if(fStruct->topLevel > 0)
1246         {
1247                 fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);
1248
1249                 // Now we have a tree with all the non-zero branches NULL but the height
1250                 // is the same as it was.
1251                 // Let's see if we can trim internal tnodes to shorten the tree.
1252                 // We can do this if only the 0th element in the tnode is in use
1253                 // (ie all the non-zero are NULL)
1254
1255                 while(fStruct->topLevel && !done)
1256                 {
1257                         tn = fStruct->top;
1258
1259                         hasData = 0;
1260                         for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)
1261                         {
1262                                 if(tn->internal[i])
1263                         {
1264                                 hasData++;
1265                                 }
1266                         }
1267
1268                         if(!hasData)
1269                         {
1270                                 fStruct->top = tn->internal[0];
1271                                 fStruct->topLevel--;
1272                                 yaffs_FreeTnode(dev,tn);
1273                         }
1274                         else
1275                         {
1276                                 done = 1;
1277                         }
1278                 }
1279         }
1280
1281         return YAFFS_OK;
1282 }
1283
1284
1285
1286
1287
1288 /////////////////////// End of File Structure functions. /////////////////
1289
1290 // yaffs_CreateFreeObjects creates a bunch more objects and
1291 // adds them to the object free list.
1292 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1293 {
1294     int i;
1295     yaffs_Object *newObjects;
1296     yaffs_ObjectList *list;
1297
1298     if(nObjects < 1) return YAFFS_OK;
1299
1300         // make these things
1301
1302     newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1303
1304     if (!newObjects)
1305     {
1306                 T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1307                 return YAFFS_FAIL;
1308     }
1309
1310     // Hook them into the free list
1311     for(i = 0; i < nObjects - 1; i++)
1312     {
1313         newObjects[i].siblings.next = (struct list_head *)(&newObjects[i+1]);
1314     }
1315
1316         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1317         dev->freeObjects = newObjects;
1318         dev->nFreeObjects+= nObjects;
1319         dev->nObjectsCreated+= nObjects;
1320
1321         // Now add this bunch of Objects to a list for freeing up.
1322
1323         list = YMALLOC(sizeof(yaffs_ObjectList));
1324         if(!list)
1325         {
1326                 T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
1327         }
1328         else
1329         {
1330                 list->objects = newObjects;
1331                 list->next = dev->allocatedObjectList;
1332                 dev->allocatedObjectList = list;
1333         }
1334
1335
1336
1337         return YAFFS_OK;
1338 }
1339
1340
1341 // AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
1342 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1343 {
1344         yaffs_Object *tn = NULL;
1345
1346         // If there are none left make more
1347         if(!dev->freeObjects)
1348         {
1349                 yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);
1350         }
1351
1352         if(dev->freeObjects)
1353         {
1354                 tn = dev->freeObjects;
1355                 dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);
1356                 dev->nFreeObjects--;
1357
1358                 // Now sweeten it up...
1359
1360                 memset(tn,0,sizeof(yaffs_Object));
1361                 tn->myDev = dev;
1362                 tn->chunkId = -1;
1363                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1364                 INIT_LIST_HEAD(&(tn->hardLinks));
1365                 INIT_LIST_HEAD(&(tn->hashLink));
1366                 INIT_LIST_HEAD(&tn->siblings);
1367
1368                 // Add it to the lost and found directory.
1369                 // NB Can't put root or lostNFound in lostNFound so
1370                 // check if lostNFound exists first
1371                 if(dev->lostNFoundDir)
1372                 {
1373                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn);
1374                 }
1375         }
1376
1377
1378         return tn;
1379 }
1380
1381 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
1382 {
1383
1384         yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
1385         if(obj)
1386         {
1387                 obj->fake = 1;                  // it is fake so it has no NAND presence...
1388                 obj->renameAllowed= 0;  // ... and we're not allowed to rename it...
1389                 obj->unlinkAllowed= 0;  // ... or unlink it
1390                 obj->deleted = 0;
1391                 obj->unlinked = 0;
1392                 obj->yst_mode = mode;
1393                 obj->myDev = dev;
1394                 obj->chunkId = 0; // Not a valid chunk.
1395         }
1396
1397         return obj;
1398
1399 }
1400
1401
1402 static void yaffs_UnhashObject(yaffs_Object *tn)
1403 {
1404         int bucket;
1405         yaffs_Device *dev = tn->myDev;
1406
1407
1408         // If it is still linked into the bucket list, free from the list
1409         if(!list_empty(&tn->hashLink))
1410         {
1411                 list_del_init(&tn->hashLink);
1412                 bucket =  yaffs_HashFunction(tn->objectId);
1413                 dev->objectBucket[bucket].count--;
1414         }
1415
1416 }
1417
1418
1419 // FreeObject frees up a Object and puts it back on the free list
1420 static void yaffs_FreeObject(yaffs_Object *tn)
1421 {
1422
1423         yaffs_Device *dev = tn->myDev;
1424
1425 #ifdef  __KERNEL__
1426         if(tn->myInode)
1427         {
1428                 // We're still hooked up to a cached inode.
1429                 // Don't delete now, but mark for later deletion
1430                 tn->deferedFree = 1;
1431                 return;
1432         }
1433 #endif
1434
1435         yaffs_UnhashObject(tn);
1436
1437         // Link into the free list.
1438         tn->siblings.next = (struct list_head *)(dev->freeObjects);
1439         dev->freeObjects = tn;
1440         dev->nFreeObjects++;
1441 }
1442
1443
1444
1445 #ifdef __KERNEL__
1446
1447 void yaffs_HandleDeferedFree(yaffs_Object *obj)
1448 {
1449         if(obj->deferedFree)
1450         {
1451            yaffs_FreeObject(obj);
1452         }
1453 }
1454
1455 #endif
1456
1457
1458
1459 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
1460 {
1461         // Free the list of allocated Objects
1462
1463         yaffs_ObjectList *tmp;
1464
1465         while( dev->allocatedObjectList)
1466         {
1467                 tmp =  dev->allocatedObjectList->next;
1468                 YFREE(dev->allocatedObjectList->objects);
1469                 YFREE(dev->allocatedObjectList);
1470
1471                 dev->allocatedObjectList =  tmp;
1472         }
1473
1474         dev->freeObjects = NULL;
1475         dev->nFreeObjects = 0;
1476 }
1477
1478 static void yaffs_InitialiseObjects(yaffs_Device *dev)
1479 {
1480         int i;
1481
1482         dev->allocatedObjectList = NULL;
1483         dev->freeObjects = NULL;
1484         dev->nFreeObjects = 0;
1485
1486         for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)
1487         {
1488                 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1489                 dev->objectBucket[i].count = 0;
1490         }
1491
1492 }
1493
1494
1495
1496
1497
1498
1499 int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
1500 {
1501         static int x = 0;
1502         int i;
1503         int l = 999;
1504         int lowest = 999999;
1505
1506
1507         // First let's see if we can find one that's empty.
1508
1509         for(i = 0; i < 10 && lowest > 0; i++)
1510          {
1511                 x++;
1512                 x %=  YAFFS_NOBJECT_BUCKETS;
1513                 if(dev->objectBucket[x].count < lowest)
1514                 {
1515                         lowest = dev->objectBucket[x].count;
1516                         l = x;
1517                 }
1518
1519         }
1520
1521         // If we didn't find an empty list, then try
1522         // looking a bit further for a short one
1523
1524         for(i = 0; i < 10 && lowest > 3; i++)
1525          {
1526                 x++;
1527                 x %=  YAFFS_NOBJECT_BUCKETS;
1528                 if(dev->objectBucket[x].count < lowest)
1529                 {
1530                         lowest = dev->objectBucket[x].count;
1531                         l = x;
1532                 }
1533
1534         }
1535
1536         return l;
1537 }
1538
1539 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
1540 {
1541         int bucket = yaffs_FindNiceObjectBucket(dev);
1542
1543         // Now find an object value that has not already been taken
1544         // by scanning the list.
1545
1546         int found = 0;
1547         struct list_head *i;
1548
1549         __u32 n = (__u32)bucket;
1550
1551         //yaffs_CheckObjectHashSanity();
1552
1553         while(!found)
1554         {
1555                 found = 1;
1556                 n +=  YAFFS_NOBJECT_BUCKETS;
1557                 if(1 ||dev->objectBucket[bucket].count > 0)
1558                 {
1559                         list_for_each(i,&dev->objectBucket[bucket].list)
1560                         {
1561                                 // If there is already one in the list
1562                                 if(i && list_entry(i, yaffs_Object,hashLink)->objectId == n)
1563                                 {
1564                                         found = 0;
1565                                 }
1566                         }
1567                 }
1568         }
1569
1570         //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
1571
1572         return n;
1573 }
1574
1575 void yaffs_HashObject(yaffs_Object *in)
1576 {
1577         int bucket = yaffs_HashFunction(in->objectId);
1578         yaffs_Device *dev = in->myDev;
1579
1580         if(!list_empty(&in->hashLink))
1581         {
1582                 //YINFO("!!!");
1583         }
1584
1585
1586         list_add(&in->hashLink,&dev->objectBucket[bucket].list);
1587         dev->objectBucket[bucket].count++;
1588
1589 }
1590
1591 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)
1592 {
1593         int bucket = yaffs_HashFunction(number);
1594         struct list_head *i;
1595         yaffs_Object *in;
1596
1597         list_for_each(i,&dev->objectBucket[bucket].list)
1598         {
1599                 // Look if it is in the list
1600                 if(i)
1601                 {
1602                         in = list_entry(i, yaffs_Object,hashLink);
1603                         if(in->objectId == number)
1604                         {
1605 #ifdef __KERNEL__
1606                                 // Don't tell the VFS about this one if it is defered free
1607                                 if(in->deferedFree)
1608                                   return NULL;
1609 #endif
1610
1611                                 return in;
1612                         }
1613                 }
1614         }
1615
1616         return NULL;
1617 }
1618
1619
1620
1621 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
1622 {
1623
1624         yaffs_Object *theObject;
1625
1626         if(number < 0)
1627         {
1628                 number = yaffs_CreateNewObjectNumber(dev);
1629         }
1630
1631         theObject = yaffs_AllocateEmptyObject(dev);
1632
1633         if(theObject)
1634         {
1635                 theObject->fake = 0;
1636                 theObject->renameAllowed = 1;
1637                 theObject->unlinkAllowed = 1;
1638                 theObject->objectId = number;
1639                 yaffs_HashObject(theObject);
1640                 theObject->variantType = type;
1641 #ifdef CONFIG_YAFFS_WINCE
1642                 yfsd_WinFileTimeNow(theObject->win_atime);
1643                 theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];
1644                 theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];
1645
1646 #else
1647
1648                 theObject->yst_atime = theObject->yst_mtime = theObject->yst_ctime = Y_CURRENT_TIME;
1649 #endif
1650                 switch(type)
1651                 {
1652                         case YAFFS_OBJECT_TYPE_FILE:
1653                                 theObject->variant.fileVariant.fileSize = 0;
1654                                 theObject->variant.fileVariant.scannedFileSize = 0;
1655                                 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; // max __u32
1656                                 theObject->variant.fileVariant.topLevel = 0;
1657                                 theObject->variant.fileVariant.top  = yaffs_GetTnode(dev);
1658                                 break;
1659                         case YAFFS_OBJECT_TYPE_DIRECTORY:
1660                                 INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
1661                                 break;
1662                         case YAFFS_OBJECT_TYPE_SYMLINK:
1663                                 // No action required
1664                                 break;
1665                         case YAFFS_OBJECT_TYPE_HARDLINK:
1666                                 // No action required
1667                                 break;
1668                         case YAFFS_OBJECT_TYPE_SPECIAL:
1669                                 // No action required
1670                                 break;
1671                         case YAFFS_OBJECT_TYPE_UNKNOWN:
1672                                 // todo this should not happen
1673                                 break;
1674                 }
1675         }
1676
1677         return theObject;
1678 }
1679
1680 yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)
1681 {
1682         yaffs_Object *theObject = NULL;
1683
1684         if(number > 0)
1685         {
1686                 theObject = yaffs_FindObjectByNumber(dev,number);
1687         }
1688
1689         if(!theObject)
1690         {
1691                 theObject = yaffs_CreateNewObject(dev,number,type);
1692         }
1693
1694         return theObject;
1695
1696 }
1697
1698 YCHAR *yaffs_CloneString(const YCHAR *str)
1699 {
1700         YCHAR *newStr = NULL;
1701
1702         if(str && *str)
1703         {
1704                 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
1705                 yaffs_strcpy(newStr,str);
1706         }
1707
1708         return newStr;
1709
1710 }
1711
1712 //
1713 // Mknod (create) a new object.
1714 // equivalentObject only has meaning for a hard link;
1715 // aliasString only has meaning for a sumlink.
1716 // rdev only has meaning for devices (a subset of special objects)
1717 yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,
1718                                                                  yaffs_Object *parent,
1719                                                                  const YCHAR *name,
1720                                                                  __u32 mode,
1721                                                                  __u32 uid,
1722                                                                  __u32 gid,
1723                                                                  yaffs_Object *equivalentObject,
1724                                                                  const YCHAR *aliasString,
1725                                                                  __u32 rdev)
1726 {
1727         yaffs_Object *in;
1728
1729         yaffs_Device *dev = parent->myDev;
1730
1731         // Check if the entry exists. If it does then fail the call since we don't want a dup.
1732         if(yaffs_FindObjectByName(parent,name))
1733         {
1734                 return NULL;
1735         }
1736
1737         in = yaffs_CreateNewObject(dev,-1,type);
1738
1739         if(in)
1740         {
1741                 in->chunkId = -1;
1742                 in->valid = 1;
1743                 in->variantType = type;
1744
1745                 in->yst_mode  = mode;
1746
1747 #ifdef CONFIG_YAFFS_WINCE
1748                 yfsd_WinFileTimeNow(in->win_atime);
1749                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1750                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1751
1752 #else
1753                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1754
1755                 in->yst_rdev  = rdev;
1756                 in->yst_uid   = uid;
1757                 in->yst_gid   = gid;
1758 #endif
1759                 in->nDataChunks = 0;
1760
1761                 yaffs_SetObjectName(in,name);
1762                 in->dirty = 1;
1763
1764                 yaffs_AddObjectToDirectory(parent,in);
1765
1766                 in->myDev = parent->myDev;
1767
1768
1769                 switch(type)
1770                 {
1771                         case YAFFS_OBJECT_TYPE_SYMLINK:
1772                                 in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);
1773                                 break;
1774                         case YAFFS_OBJECT_TYPE_HARDLINK:
1775                                 in->variant.hardLinkVariant.equivalentObject = equivalentObject;
1776                                 in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
1777                                 list_add(&in->hardLinks,&equivalentObject->hardLinks);
1778                                 break;
1779                         case YAFFS_OBJECT_TYPE_FILE: // do nothing
1780                         case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
1781                         case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
1782                         case YAFFS_OBJECT_TYPE_UNKNOWN:
1783                                 break;
1784                 }
1785
1786                 if(/*yaffs_GetNumberOfFreeChunks(dev) <= 0 || */
1787                    yaffs_UpdateObjectHeader(in,name,0,0) < 0)
1788                 {
1789                         // Could not create the object header, fail the creation
1790                         yaffs_DestroyObject(in);
1791                         in = NULL;
1792                 }
1793
1794         }
1795
1796         return in;
1797 }
1798
1799 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid)
1800 {
1801         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0);
1802 }
1803
1804 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid)
1805 {
1806         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);
1807 }
1808
1809 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1810 {
1811         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL,parent,name,mode,uid,gid,NULL,NULL,rdev);
1812 }
1813
1814 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid,const YCHAR *alias)
1815 {
1816         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0);
1817 }
1818
1819 // NB yaffs_Link returns the object id of the equivalent object.
1820 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, yaffs_Object *equivalentObject)
1821 {
1822         // Get the real object in case we were fed a hard link as an equivalent object
1823         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1824
1825         if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0))
1826         {
1827                 return equivalentObject;
1828         }
1829         else
1830         {
1831                 return NULL;
1832         }
1833
1834 }
1835
1836
1837 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const YCHAR *newName,int force)
1838 {
1839         int unlinkOp;
1840         int deleteOp;
1841
1842         if(newDir == NULL)
1843         {
1844                 newDir = obj->parent; // use the old directory
1845         }
1846
1847         if(newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
1848         {
1849                 T(YAFFS_TRACE_ALWAYS,(TSTR("tragendy: yaffs_ChangeObjectName: newDir is not a directory"TENDSTR)));
1850                 YBUG();
1851         }
1852
1853         // TODO: Do we need this different handling for YAFFS2 and YAFFS1??
1854         if(obj->myDev->isYaffs2)
1855         {
1856                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
1857         }
1858         else
1859         {
1860                 unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1861         }
1862
1863         deleteOp = (newDir == obj->myDev->deletedDir);
1864
1865         // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since
1866         // duplicate names are allowed.
1867         // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.
1868         if( (unlinkOp||
1869                  deleteOp ||
1870                  force ||
1871                  !yaffs_FindObjectByName(newDir,newName))  &&
1872              newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1873         {
1874                 yaffs_SetObjectName(obj,newName);
1875                 obj->dirty = 1;
1876
1877                 yaffs_AddObjectToDirectory(newDir,obj);
1878
1879                 if(unlinkOp) obj->unlinked = 1;
1880
1881                 // If it is a deletion then we mark it as a shrink for gc purposes.
1882                 if(yaffs_UpdateObjectHeader(obj,newName,0,deleteOp) >= 0)
1883                 {
1884                         return YAFFS_OK;
1885                 }
1886         }
1887
1888         return YAFFS_FAIL;
1889 }
1890
1891
1892
1893 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, yaffs_Object *newDir, const YCHAR *newName)
1894 {
1895         yaffs_Object *obj;
1896         int force = 0;
1897
1898 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1899         // Special case for case insemsitive systems (eg. WinCE).
1900         // While look-up is case insensitive, the name isn't.
1901         // THerefore we might want to change x.txt to X.txt
1902         if(oldDir == newDir && yaffs_strcmp(oldName,newName) == 0)
1903         {
1904                 force = 1;
1905         }
1906 #endif
1907
1908         obj = yaffs_FindObjectByName(oldDir,oldName);
1909         if(obj && obj->renameAllowed)
1910         {
1911                 return yaffs_ChangeObjectName(obj,newDir,newName,force);
1912         }
1913         return YAFFS_FAIL;
1914 }
1915
1916
1917 #if 0
1918
1919 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
1920 {
1921         // Scan the buckets and check that the lists
1922         // have as many members as the count says there are
1923         int bucket;
1924         int countEm;
1925         struct list_head *j;
1926         int ok = YAFFS_OK;
1927
1928         for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
1929         {
1930                 countEm = 0;
1931
1932                 list_for_each(j,&dev->objectBucket[bucket].list)
1933                 {
1934                         countEm++;
1935                 }
1936
1937                 if(countEm != dev->objectBucket[bucket].count)
1938                 {
1939                         T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
1940                         ok = YAFFS_FAIL;
1941                 }
1942         }
1943
1944         return ok;
1945 }
1946
1947
1948 void yaffs_ObjectTest(yaffs_Device *dev)
1949 {
1950         yaffs_Object *in[1000];
1951         int inNo[1000];
1952         yaffs_Object *inold[1000];
1953         int i;
1954         int j;
1955
1956         memset(in,0,1000*sizeof(yaffs_Object *));
1957         memset(inold,0,1000*sizeof(yaffs_Object *));
1958
1959         yaffs_CheckObjectHashSanity(dev);
1960
1961         for(j = 0; j < 10; j++)
1962         {
1963                 //T(("%d\n",j));
1964
1965                 for(i = 0; i < 1000; i++)
1966                 {
1967                         in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
1968                         if(!in[i])
1969                         {
1970                                 YINFO("No more inodes");
1971                         }
1972                         else
1973                         {
1974                                 inNo[i] = in[i]->objectId;
1975                         }
1976                 }
1977
1978                 for(i = 0; i < 1000; i++)
1979                 {
1980                         if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
1981                         {
1982                                 //T(("Differnce in look up test\n"));
1983                         }
1984                         else
1985                         {
1986                                 // T(("Look up ok\n"));
1987                         }
1988                 }
1989
1990                 yaffs_CheckObjectHashSanity(dev);
1991
1992                 for(i = 0; i < 1000; i+=3)
1993                 {
1994                         yaffs_FreeObject(in[i]);
1995                         in[i] = NULL;
1996                 }
1997
1998
1999                 yaffs_CheckObjectHashSanity(dev);
2000         }
2001
2002 }
2003
2004 #endif
2005
2006 /////////////////////////// Block Management and Page Allocation ///////////////////
2007
2008
2009 static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
2010 {
2011         dev->allocationBlock = -1; // force it to get a new one
2012         //Todo we're assuming the malloc will pass.
2013         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2014         // Set up dynamic blockinfo stuff.
2015         dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8;
2016         dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2017         if(dev->blockInfo && dev->chunkBits)
2018         {
2019                 memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));
2020                 memset(dev->chunkBits,0,dev->chunkBitmapStride * nBlocks);
2021                 return YAFFS_OK;
2022         }
2023
2024         return YAFFS_FAIL;
2025
2026 }
2027
2028 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2029 {
2030         YFREE(dev->blockInfo);
2031         dev->blockInfo = NULL;
2032         YFREE(dev->chunkBits);
2033         dev->chunkBits = NULL;
2034 }
2035
2036
2037 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev, yaffs_BlockInfo *bi)
2038 {
2039         int i;
2040         __u32 seq;
2041         yaffs_BlockInfo *b;
2042
2043         if(!dev->isYaffs2) return 1; // disqualification only applies to yaffs2.
2044
2045         if(!bi->hasShrinkHeader) return 1; // can gc
2046
2047
2048         // Find the oldest dirty sequence number if we don't know it and save it
2049         // so we don't have to keep recomputing it.
2050         if(!dev->oldestDirtySequence)
2051         {
2052                 seq = dev->sequenceNumber;
2053
2054                 for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++)
2055                 {
2056                         b = yaffs_GetBlockInfo(dev,i);
2057                         if(b->blockState == YAFFS_BLOCK_STATE_FULL &&
2058                         (b->pagesInUse - b->softDeletions )< dev->nChunksPerBlock &&
2059                         b->sequenceNumber < seq)
2060                         {
2061                                 seq = b->sequenceNumber;
2062                         }
2063                 }
2064                 dev->oldestDirtySequence = seq;
2065         }
2066
2067
2068         // Can't do gc of this block if there are any blocks older than this one that have
2069         // discarded pages.
2070         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2071
2072
2073         return 1;
2074
2075 }
2076
2077 // FindDiretiestBlock is used to select the dirtiest block (or close enough)
2078 // for garbage collection.
2079 //
2080
2081
2082
2083 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,int aggressive)
2084 {
2085
2086         int b = dev->currentDirtyChecker;
2087
2088         int i;
2089         int iterations;
2090         int dirtiest = -1;
2091         int pagesInUse;
2092         yaffs_BlockInfo *bi;
2093         static int  nonAggressiveSkip = 0;
2094
2095         // If we're doing aggressive GC then we are happy to take a less-dirty block, and
2096         // search harder.
2097         // else (we're doing a leasurely gc), then we only bother to do this if the
2098         // block has only a few pages in use.
2099
2100
2101         nonAggressiveSkip--;
2102
2103         if(!aggressive &&(nonAggressiveSkip > 0))
2104         {
2105                 return -1;
2106         }
2107
2108         pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2109
2110         if(aggressive)
2111         {
2112                 iterations = dev->internalEndBlock - dev->internalStartBlock + 1;
2113         }
2114         else
2115         {
2116                 iterations = dev->internalEndBlock - dev->internalStartBlock + 1;
2117                 iterations = iterations / 16;
2118                 if(iterations > 200)
2119                 {
2120                         iterations = 200;
2121                 }
2122         }
2123
2124         for(i = 0; i <= iterations && pagesInUse > 0 ; i++)
2125         {
2126                 b++;
2127                 if ( b < dev->internalStartBlock || b > dev->internalEndBlock)
2128                 {
2129                         b =  dev->internalStartBlock;
2130                 }
2131
2132                 if(b < dev->internalStartBlock || b > dev->internalEndBlock)
2133                 {
2134                         T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));
2135                         YBUG();
2136                 }
2137
2138                 bi = yaffs_GetBlockInfo(dev,b);
2139
2140                 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2141                    (bi->pagesInUse - bi->softDeletions )< pagesInUse &&
2142                    yaffs_BlockNotDisqualifiedFromGC(dev,bi))
2143                 {
2144                         dirtiest = b;
2145                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2146                 }
2147         }
2148
2149         dev->currentDirtyChecker = b;
2150
2151         if(dirtiest > 0)
2152         {
2153                 T(YAFFS_TRACE_GC,(TSTR("GC Selected block %d with %d free" TENDSTR),dirtiest,dev->nChunksPerBlock - pagesInUse));
2154         }
2155
2156         dev->oldestDirtySequence = 0; // clear this
2157
2158         if(dirtiest > 0)
2159         {
2160                 nonAggressiveSkip = 4;
2161         }
2162
2163         return dirtiest;
2164 }
2165
2166
2167 static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
2168 {
2169         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);
2170
2171         int erasedOk = 0;
2172
2173         // If the block is still healthy erase it and mark as clean.
2174         // If the block has had a data failure, then retire it.
2175         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2176
2177         if(!bi->needsRetiring)
2178         {
2179                 erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
2180                 if(!erasedOk)
2181                 {
2182                         dev->nErasureFailures++;
2183                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
2184                 }
2185         }
2186
2187         if(erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE))
2188         {
2189                         int i;
2190                         for(i = 0; i < dev->nChunksPerBlock; i++)
2191                         {
2192                                         if(!yaffs_CheckChunkErased(dev,blockNo * dev->nChunksPerBlock + i))
2193                                         {
2194                                                 T(YAFFS_TRACE_ERROR,(TSTR(">>Block %d erasure supposedly OK, but chunk %d not erased" TENDSTR),blockNo,i));
2195                                         }
2196                         }
2197         }
2198
2199         if( erasedOk )
2200         {
2201                 // Clean it up...
2202                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2203                 dev->nErasedBlocks++;
2204                 bi->pagesInUse = 0;
2205                 bi->softDeletions = 0;
2206                 bi->hasShrinkHeader=0;
2207                 yaffs_ClearChunkBits(dev,blockNo);
2208
2209                 T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
2210         }
2211         else
2212         {
2213                 dev->nFreeChunks -= dev->nChunksPerBlock; // We lost a block of free space
2214
2215                 yaffs_RetireBlock(dev,blockNo);
2216                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));
2217         }
2218 }
2219
2220 #if 0
2221 static void yaffs_DumpBlockStats(yaffs_Device *dev)
2222 {
2223         int i,j;
2224         yaffs_BlockInfo *bi;
2225
2226         for(i= dev->internalStartBlock; i <=dev->internalEndBlock; i++)
2227         {
2228                 bi = yaffs_GetBlockInfo(dev,i);
2229                 T(YAFFS_TRACE_ALLOCATE,(TSTR("%3d state %d shrink %d inuse %d/%d seq %d pages"),i,
2230                 bi->blockState,bi->hasShrinkHeader,bi->pagesInUse,bi->softDeletions,bi->sequenceNumber));
2231
2232                 for(j = 0; j < dev->nChunksPerBlock; j++)
2233                 {
2234                         if(yaffs_CheckChunkBit(dev,i,j))
2235                         {
2236                                 T(YAFFS_TRACE_ALLOCATE,(TSTR(" %d"),j));
2237
2238                         }
2239                 }
2240                 T(YAFFS_TRACE_ALLOCATE,(TSTR(" " TENDSTR)));
2241
2242         }
2243 }
2244 #endif
2245
2246
2247 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2248 {
2249         int i;
2250
2251         yaffs_BlockInfo *bi;
2252
2253 #if 0
2254         static int j = 0;
2255         j++;
2256         if(j < 0 || j > 100)
2257         {
2258                 j = 0;
2259                 yaffs_DumpBlockStats(dev);
2260         }
2261
2262 #endif
2263
2264         if(dev->nErasedBlocks < 1)
2265         {
2266                 // Hoosterman we've got a problem.
2267                 // Can't get space to gc
2268                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2269
2270                 return -1;
2271         }
2272
2273         // Find an empty block.
2274
2275         for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++)
2276         {
2277                 dev->allocationBlockFinder++;
2278                 if(dev->allocationBlockFinder < dev->internalStartBlock || dev->allocationBlockFinder> dev->internalEndBlock)
2279                 {
2280                         dev->allocationBlockFinder = dev->internalStartBlock;
2281                 }
2282
2283                 bi = yaffs_GetBlockInfo(dev,dev->allocationBlockFinder);
2284
2285                 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
2286                 {
2287                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2288                         dev->sequenceNumber++;
2289                         bi->sequenceNumber = dev->sequenceNumber;
2290                         dev->nErasedBlocks--;
2291                         T(YAFFS_TRACE_ALLOCATE,(TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),dev->allocationBlockFinder,dev->sequenceNumber, dev->nErasedBlocks));
2292                         return dev->allocationBlockFinder;
2293                 }
2294         }
2295
2296
2297         T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs tragedy: no more eraased blocks, but there should have been %d" TENDSTR),dev->nErasedBlocks));
2298
2299
2300
2301
2302
2303         return -1;
2304 }
2305
2306
2307 // To determine if we have enough space we just look at the
2308 // number of erased blocks.
2309
2310 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
2311 {
2312         int reservedChunks = (dev->nReservedBlocks * dev->nChunksPerBlock);
2313         return (dev->nFreeChunks > reservedChunks);
2314 }
2315
2316
2317 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
2318 {
2319         int retVal;
2320         yaffs_BlockInfo *bi;
2321
2322         if(dev->allocationBlock < 0)
2323         {
2324                 // Get next block to allocate off
2325                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2326                 dev->allocationPage = 0;
2327         }
2328
2329         if(!useReserve &&  !yaffs_CheckSpaceForAllocation(dev))
2330         {
2331                 // Not enough space to allocate unless we're allowed to use the reserve.
2332                 return -1;
2333         }
2334
2335         if(dev->nErasedBlocks < dev->nReservedBlocks && dev->allocationPage == 0)
2336         {
2337                 T(YAFFS_TRACE_ALLOCATE,(TSTR("Allocating reserve" TENDSTR)));
2338         }
2339
2340
2341         // Next page please....
2342         if(dev->allocationBlock >= 0)
2343         {
2344                 bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);
2345
2346                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2347                                   dev->allocationPage;
2348                 bi->pagesInUse++;
2349                 yaffs_SetChunkBit(dev,dev->allocationBlock,dev->allocationPage);
2350
2351                 dev->allocationPage++;
2352
2353                 dev->nFreeChunks--;
2354
2355                 // If the block is full set the state to full
2356                 if(dev->allocationPage >= dev->nChunksPerBlock)
2357                 {
2358                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2359                         dev->allocationBlock = -1;
2360                 }
2361
2362
2363                 return retVal;
2364
2365         }
2366         T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2367
2368         return -1;
2369 }
2370
2371
2372
2373
2374 static int yaffs_GetErasedChunks(yaffs_Device *dev)
2375 {
2376                 int n;
2377
2378                 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2379
2380                 if(dev->allocationBlock> 0)
2381                 {
2382                         n += (dev->nChunksPerBlock - dev->allocationPage);
2383                 }
2384
2385                 return n;
2386
2387 }
2388
2389 int  yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)
2390 {
2391         int oldChunk;
2392         int newChunk;
2393         int chunkInBlock;
2394         int markNAND;
2395         int retVal = YAFFS_OK;
2396         int cleanups = 0;
2397         int i;
2398
2399         int chunksBefore = yaffs_GetErasedChunks(dev);
2400         int chunksAfter;
2401
2402         yaffs_ExtendedTags  tags;
2403
2404         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
2405
2406         yaffs_Object *object;
2407
2408         bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2409
2410         T(YAFFS_TRACE_TRACING,(TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR),block,bi->pagesInUse,bi->hasShrinkHeader));
2411         //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
2412
2413         //yaffs_VerifyFreeChunks(dev);
2414
2415         bi->hasShrinkHeader = 0; // clear the flag so that the block can erase
2416
2417         dev->nFreeChunks -= bi->softDeletions;  // Take off the number of soft deleted entries because
2418                                                 // they're going to get really deleted during GC.
2419
2420
2421         if(!yaffs_StillSomeChunkBits(dev,block))
2422         {
2423                 T(YAFFS_TRACE_TRACING,(TSTR("Collecting block %d that has no chunks in use" TENDSTR),block));
2424                 yaffs_BlockBecameDirty(dev,block);
2425         }
2426         else
2427         {
2428
2429         __u8  *buffer = yaffs_GetTempBuffer(dev,__LINE__);
2430
2431         for(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock;
2432             chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block);
2433             chunkInBlock++, oldChunk++ )
2434         {
2435                 if(yaffs_CheckChunkBit(dev,block,chunkInBlock))
2436                 {
2437
2438                         // This page is in use and might need to be copied off
2439
2440                         markNAND = 1;
2441
2442                         //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
2443
2444                         yaffs_InitialiseTags(&tags);
2445
2446                         yaffs_ReadChunkWithTagsFromNAND(dev,oldChunk,buffer, &tags);
2447
2448                         object = yaffs_FindObjectByNumber(dev,tags.objectId);
2449
2450                         T(YAFFS_TRACE_GC_DETAIL,(TSTR("Collecting page %d, %d %d %d " TENDSTR),chunkInBlock,tags.objectId,tags.chunkId,tags.byteCount));
2451
2452                         if(!object)
2453                         {
2454                                 T(YAFFS_TRACE_ERROR,(TSTR("page %d in gc has no object " TENDSTR),oldChunk));
2455                         }
2456
2457                         if(object && object->deleted && tags.chunkId != 0)
2458                         {
2459                                 // Data chunk in a deleted file, throw it away
2460                                 // It's a soft deleted data chunk,
2461                                 // No need to copy this, just forget about it and fix up the
2462                                 // object.
2463
2464                                 //yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
2465                                 object->nDataChunks--;
2466
2467                                 if(object->nDataChunks <= 0)
2468                                 {
2469                                         // remeber to clean up the object
2470                                         dev->gcCleanupList[cleanups] = tags.objectId;
2471                                         cleanups++;
2472                                 }
2473                                 markNAND = 0;
2474                         }
2475                         else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */)
2476                         {
2477                                 // Deleted object header with no data chunks.
2478                                 // Can be discarded and the file deleted.
2479                                 object->chunkId = 0;
2480                                 yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
2481                                 object->variant.fileVariant.top = NULL;
2482                                 yaffs_DoGenericObjectDeletion(object);
2483
2484                         }
2485                         else if(object)
2486                         {
2487                                 // It's either a data chunk in a live file or
2488                                 // an ObjectHeader, so we're interested in it.
2489                                 // NB Need to keep the ObjectHeaders of deleted files
2490                                 // until the whole file has been deleted off
2491                                 tags.serialNumber++;
2492
2493                                 dev->nGCCopies++;
2494
2495                                 newChunk = yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags,1);
2496
2497                                 if(newChunk < 0)
2498                                 {
2499                                         retVal =  YAFFS_FAIL;
2500                                 }
2501                                 else
2502                                 {
2503
2504                                         // Ok, now fix up the Tnodes etc.
2505
2506                                         if(tags.chunkId == 0)
2507                                         {
2508                                                 // It's a header
2509                                                 object->chunkId = newChunk;
2510                                                 object->serial = tags.serialNumber;
2511                                         }
2512                                         else
2513                                         {
2514                                                 // It's a data chunk
2515                                                 yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);
2516                                         }
2517                                 }
2518                         }
2519
2520                         yaffs_DeleteChunk(dev,oldChunk,markNAND,__LINE__);
2521
2522                 }
2523         }
2524
2525         yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
2526
2527         //yaffs_VerifyFreeChunks(dev);
2528
2529         // Do any required cleanups
2530         for(i = 0; i < cleanups; i++)
2531         {
2532                 // Time to delete the file too
2533                 object =  yaffs_FindObjectByNumber(dev,dev->gcCleanupList[i]);
2534                 if(object)
2535                 {
2536                         yaffs_FreeTnode(dev,object->variant.fileVariant.top);
2537                         object->variant.fileVariant.top = NULL;
2538                         T(YAFFS_TRACE_GC,(TSTR("yaffs: About to finally delete object %d" TENDSTR),object->objectId));
2539                         yaffs_DoGenericObjectDeletion(object);
2540                 }
2541
2542         }
2543
2544         }
2545
2546         if(chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev)))
2547         {
2548                         T(YAFFS_TRACE_GC,(TSTR("gc did not increase free chunks before %d after %d" TENDSTR),chunksBefore,chunksAfter));
2549         }
2550
2551
2552         //yaffs_VerifyFreeChunks(dev);
2553
2554         return YAFFS_OK;
2555 }
2556
2557 #if 0
2558 static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
2559 {
2560         // find a file to delete
2561         struct list_head *i;
2562         yaffs_Object *l;
2563
2564
2565         //Scan the unlinked files looking for one to delete
2566         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
2567         {
2568                 if(i)
2569                 {
2570                         l = list_entry(i, yaffs_Object,siblings);
2571                         if(l->deleted)
2572                         {
2573                                 return l;
2574                         }
2575                 }
2576         }
2577         return NULL;
2578 }
2579
2580
2581 static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
2582 {
2583         // This does background deletion on unlinked files.. only deleted ones.
2584         // If we don't have a file we're working on then find one
2585         if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
2586         {
2587                 dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
2588         }
2589
2590         // OK, we're working on a file...
2591         if(dev->unlinkedDeletion)
2592         {
2593                 yaffs_Object *obj = dev->unlinkedDeletion;
2594                 int delresult;
2595                 int limit; // Number of chunks to delete in a file.
2596                                    // NB this can be exceeded, but not by much.
2597
2598                 limit = -1;
2599
2600                 delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
2601
2602                 if(obj->nDataChunks == 0)
2603                 {
2604                         // Done all the deleting of data chunks.
2605                         // Now dump the header and clean up
2606                         yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
2607                         obj->variant.fileVariant.top = NULL;
2608                         yaffs_DoGenericObjectDeletion(obj);
2609                         dev->nDeletedFiles--;
2610                         dev->nUnlinkedFiles--;
2611                         dev->nBackgroundDeletions++;
2612                         dev->unlinkedDeletion = NULL;
2613                 }
2614         }
2615 }
2616
2617 #endif
2618
2619
2620
2621 // New garbage collector
2622 // If we're very low on erased blocks then we do aggressive garbage collection
2623 // otherwise we do "leasurely" garbage collection.
2624 // Aggressive gc looks further (whole array) and will accept dirtier blocks.
2625 // Passive gc only inspects smaller areas and will only accept cleaner blocks.
2626 //
2627 // The idea is to help clear out space in a more spread-out manner.
2628 // Dunno if it really does anything useful.
2629 //
2630 int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2631 {
2632         int block;
2633         int aggressive;
2634         int gcOk = YAFFS_OK;
2635         int maxTries = 0;
2636
2637         //yaffs_DoUnlinkedFileDeletion(dev);
2638
2639         //yaffs_VerifyFreeChunks(dev);
2640
2641         // This loop should pass the first time.
2642         // We'll only see looping here if the erase of the collected block fails.
2643
2644         do{
2645                 maxTries++;
2646                 if(dev->nErasedBlocks < dev->nReservedBlocks)
2647                 {
2648                         // We need a block soon...
2649                         aggressive = 1;
2650                 }
2651                 else
2652                 {
2653                         // We're in no hurry
2654                         aggressive = 0;
2655                 }
2656
2657                 block = yaffs_FindBlockForGarbageCollection(dev,aggressive);
2658
2659                 if(block > 0)
2660                 {
2661                         dev->garbageCollections++;
2662                         if(!aggressive)
2663                         {
2664                                 dev->passiveGarbageCollections++;
2665                         }
2666
2667                         T(YAFFS_TRACE_GC,(TSTR("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),dev->nErasedBlocks,aggressive));
2668
2669                         gcOk =  yaffs_GarbageCollectBlock(dev,block);
2670                 }
2671
2672                 if(dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0)
2673                 {
2674                         T(YAFFS_TRACE_GC,(TSTR("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d" TENDSTR),dev->nErasedBlocks,maxTries,block));
2675                 }
2676         } while((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0) && (maxTries < 2));
2677
2678         return aggressive ? gcOk: YAFFS_OK;
2679 }
2680
2681
2682 //////////////////////////// TAGS ///////////////////////////////////////
2683
2684
2685
2686 #if 0
2687
2688 void yaffs_CalcTagsECC(yaffs_Tags *tags)
2689 {
2690         // Calculate an ecc
2691
2692         unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
2693         unsigned  i,j;
2694         unsigned  ecc = 0;
2695         unsigned bit = 0;
2696
2697         tags->ecc = 0;
2698
2699         for(i = 0; i < 8; i++)
2700         {
2701                 for(j = 1; j &0xff; j<<=1)
2702                 {
2703                         bit++;
2704                         if(b[i] & j)
2705                         {
2706                                 ecc ^= bit;
2707                         }
2708                 }
2709         }
2710
2711         tags->ecc = ecc;
2712
2713
2714 }
2715
2716 int  yaffs_CheckECCOnTags(yaffs_Tags *tags)
2717 {
2718         unsigned ecc = tags->ecc;
2719
2720         yaffs_CalcTagsECC(tags);
2721
2722         ecc ^= tags->ecc;
2723
2724         if(ecc && ecc <= 64)
2725         {
2726                 // TODO: Handle the failure better. Retire?
2727                 unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
2728
2729                 ecc--;
2730
2731                 b[ecc / 8] ^= (1 << (ecc & 7));
2732
2733                 // Now recvalc the ecc
2734                 yaffs_CalcTagsECC(tags);
2735
2736                 return 1; // recovered error
2737         }
2738         else if(ecc)
2739         {
2740                 // Wierd ecc failure value
2741                 // TODO Need to do somethiong here
2742                 return -1; //unrecovered error
2743         }
2744
2745         return 0;
2746 }
2747
2748 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
2749 {
2750         yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2751
2752         yaffs_CalcTagsECC(tagsPtr);
2753
2754         sparePtr->tagByte0 = tu->asBytes[0];
2755         sparePtr->tagByte1 = tu->asBytes[1];
2756         sparePtr->tagByte2 = tu->asBytes[2];
2757         sparePtr->tagByte3 = tu->asBytes[3];
2758         sparePtr->tagByte4 = tu->asBytes[4];
2759         sparePtr->tagByte5 = tu->asBytes[5];
2760         sparePtr->tagByte6 = tu->asBytes[6];
2761         sparePtr->tagByte7 = tu->asBytes[7];
2762 }
2763
2764 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
2765 {
2766         yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2767         int result;
2768
2769         tu->asBytes[0]= sparePtr->tagByte0;
2770         tu->asBytes[1]= sparePtr->tagByte1;
2771         tu->asBytes[2]= sparePtr->tagByte2;
2772         tu->asBytes[3]= sparePtr->tagByte3;
2773         tu->asBytes[4]= sparePtr->tagByte4;
2774         tu->asBytes[5]= sparePtr->tagByte5;
2775         tu->asBytes[6]= sparePtr->tagByte6;
2776         tu->asBytes[7]= sparePtr->tagByte7;
2777
2778         result =  yaffs_CheckECCOnTags(tagsPtr);
2779         if(result> 0)
2780         {
2781                 dev->tagsEccFixed++;
2782         }
2783         else if(result <0)
2784         {
2785                 dev->tagsEccUnfixed++;
2786         }
2787 }
2788
2789 static void yaffs_SpareInitialise(yaffs_Spare *spare)
2790 {
2791         memset(spare,0xFF,sizeof(yaffs_Spare));
2792 }
2793
2794 #endif
2795
2796 #if 0
2797 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve)
2798 {
2799         // NB There must be tags, data is optional
2800         // If there is data, then an ECC is calculated on it.
2801
2802         yaffs_Spare spare;
2803
2804         if(!tags)
2805         {
2806                 return YAFFS_FAIL;
2807         }
2808
2809         //yaffs_SpareInitialise(&spare);
2810
2811         //if(!dev->useNANDECC && buffer)
2812         //{
2813         //      yaffs_CalcECC(buffer,&spare);
2814         //}
2815
2816         //yaffs_LoadTagsIntoSpare(&spare,tags);
2817
2818         return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
2819
2820 }
2821 #endif
2822
2823 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject)
2824 {
2825         return  (  tags->chunkId == chunkInObject &&
2826                            tags->objectId == objectId &&
2827                            !tags->chunkDeleted) ? 1 : 0;
2828
2829 }
2830
2831 /////////////////////////////////////////////////////////////////////////////////////////////////////////
2832
2833
2834 int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_ExtendedTags *tags)
2835 {
2836         //Get the Tnode, then get the level 0 offset chunk offset
2837     yaffs_Tnode *tn;
2838     int theChunk = -1;
2839     yaffs_ExtendedTags localTags;
2840     int retVal = -1;
2841
2842     yaffs_Device *dev = in->myDev;
2843
2844
2845     if(!tags)
2846     {
2847         // Passed a NULL, so use our own tags space
2848         tags = &localTags;
2849     }
2850
2851     tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2852
2853     if(tn)
2854     {
2855                 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2856
2857                 retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
2858     }
2859     return retVal;
2860 }
2861
2862 int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_ExtendedTags *tags)
2863 {
2864         //Get the Tnode, then get the level 0 offset chunk offset
2865     yaffs_Tnode *tn;
2866     int theChunk = -1;
2867     yaffs_ExtendedTags localTags;
2868
2869     yaffs_Device *dev = in->myDev;
2870     int retVal = -1;
2871
2872     if(!tags)
2873     {
2874         // Passed a NULL, so use our own tags space
2875         tags = &localTags;
2876     }
2877
2878     tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2879
2880     if(tn)
2881     {
2882
2883                 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2884
2885                 retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
2886
2887                 // Delete the entry in the filestructure (if found)
2888                 if(retVal != -1)
2889                 {
2890                         tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
2891                 }
2892     }
2893     else
2894     {
2895         //T(("No level 0 found for %d\n", chunkInInode));
2896     }
2897
2898     if(retVal == -1)
2899     {
2900         //T(("Could not find %d to delete\n",chunkInInode));
2901     }
2902     return retVal;
2903 }
2904
2905
2906 #ifdef YAFFS_PARANOID
2907
2908 static int yaffs_CheckFileSanity(yaffs_Object *in)
2909 {
2910         int chunk;
2911         int nChunks;
2912         int fSize;
2913         int failed = 0;
2914         int objId;
2915         yaffs_Tnode *tn;
2916     yaffs_Tags localTags;
2917     yaffs_Tags *tags = &localTags;
2918     int theChunk;
2919     int chunkDeleted;
2920
2921
2922         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
2923         {
2924                 //T(("Object not a file\n"));
2925                 return YAFFS_FAIL;
2926         }
2927
2928         objId = in->objectId;
2929         fSize  = in->variant.fileVariant.fileSize;
2930         nChunks = (fSize + in->myDev->nBytesPerChunk -1)/in->myDev->nBytesPerChunk;
2931
2932         for(chunk = 1; chunk <= nChunks; chunk++)
2933         {
2934                 tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
2935
2936                 if(tn)
2937                 {
2938
2939                         theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
2940
2941                 if(yaffs_CheckChunkBits(dev,theChunk/dev->nChunksPerBlock,theChunk%dev->nChunksPerBlock))
2942                         {
2943
2944
2945                                 yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);
2946                                 if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))
2947                                 {
2948                                         // found it;
2949
2950                                 }
2951                         }
2952                         else
2953                         {
2954                                 //T(("File problem file [%d,%d] NAND %d  tags[%d,%d]\n",
2955                                 //              objId,chunk,theChunk,tags->chunkId,tags->objectId);
2956
2957                                 failed = 1;
2958
2959                         }
2960
2961                 }
2962                 else
2963                 {
2964                         //T(("No level 0 found for %d\n", chunk));
2965                 }
2966         }
2967
2968         return failed ? YAFFS_FAIL : YAFFS_OK;
2969 }
2970
2971 #endif
2972
2973 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan)
2974 {
2975         // NB inScan is zero unless scanning. For forward scanning, inScan is > 0; for backward scanning inScan is < 0
2976         yaffs_Tnode *tn;
2977         yaffs_Device *dev = in->myDev;
2978         int existingChunk;
2979         yaffs_ExtendedTags existingTags;
2980         yaffs_ExtendedTags newTags;
2981         unsigned existingSerial, newSerial;
2982
2983         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
2984         {
2985                 // Just ignore an attempt at putting a chunk into a non-file during scanning
2986                 // If it is not during Scanning then something went wrong!
2987                 if(!inScan)
2988                 {
2989                         T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy:attempt to put data chunk into a non-file" TENDSTR)));
2990                         YBUG();
2991                 }
2992
2993                 yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
2994                 return YAFFS_OK;
2995         }
2996
2997         tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2998         if(!tn)
2999         {
3000                 return YAFFS_FAIL;
3001         }
3002
3003         existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
3004
3005         if(inScan != 0)
3006         {
3007                 // If we're scanning then we need to test for duplicates
3008                 // NB This does not need to be efficient since it should only ever
3009                 // happen when the power fails during a write, then only one
3010                 // chunk should ever be affected.
3011                 //
3012                 // Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3013                 // Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3014
3015
3016
3017                 if(existingChunk != 0)
3018                 {
3019                         // NB Right now existing chunk will not be real chunkId if the device >= 32MB
3020                         //    thus we have to do a FindChunkInFile to get the real chunk id.
3021                         //
3022                         // We have a duplicate now we need to decide which one to use:
3023                         //
3024                         // Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3025                         // Forward scanning YAFFS2: The new one is what we use, dump the old one.
3026                         // YAFFS1: Get both sets of tags and compare serial numbers.
3027                         //
3028                         //
3029
3030                         if(inScan > 0)
3031                         {
3032                                 // Only do this for forward scanning
3033                                 yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND, NULL,&newTags);
3034
3035
3036                                 // Do a proper find
3037                                 existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags);
3038                         }
3039
3040                         if(existingChunk <=0)
3041                         {
3042                                 //Hoosterman - how did this happen?
3043
3044                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: existing chunk < 0 in scan" TENDSTR)));
3045
3046                         }
3047
3048
3049                         // NB The deleted flags should be false, otherwise the chunks will
3050                         // not be loaded during a scan
3051
3052                         newSerial = newTags.serialNumber;
3053                         existingSerial = existingTags.serialNumber;
3054
3055                         if( (inScan > 0) &&
3056                             ( in->myDev->isYaffs2  ||
3057                               existingChunk <= 0 ||
3058                              ((existingSerial+1) & 3) == newSerial))
3059                         {
3060                                 // Forward scanning.
3061                                 // Use new
3062                                 // Delete the old one and drop through to update the tnode
3063                                 yaffs_DeleteChunk(dev,existingChunk,1,__LINE__);
3064                         }
3065                         else
3066                         {
3067                                 // Backward scanning or we want to use the existing one
3068                                 // Use existing.
3069                                 // Delete the new one and return early so that the tnode isn't changed
3070                                 yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
3071                                 return YAFFS_OK;
3072                         }
3073                 }
3074
3075         }
3076
3077         if(existingChunk == 0)
3078         {
3079                 in->nDataChunks++;
3080         }
3081
3082         tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
3083
3084         return YAFFS_OK;
3085 }
3086
3087
3088
3089 int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer)
3090 {
3091     int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL);
3092
3093     if(chunkInNAND >= 0)
3094     {
3095                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev,chunkInNAND,buffer,NULL);
3096         }
3097         else
3098         {
3099                 T(YAFFS_TRACE_NANDACCESS,(TSTR("Chunk %d not found zero instead" TENDSTR),chunkInNAND));
3100
3101                 memset(buffer,0,in->myDev->nBytesPerChunk); // get sane data if you read a hole
3102                 return 0;
3103         }
3104
3105 }
3106
3107
3108 void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND,int lyn)
3109 {
3110         int block;
3111         int page;
3112         yaffs_ExtendedTags tags;
3113         yaffs_BlockInfo *bi;
3114
3115         if(chunkId <= 0) return;
3116
3117         dev->nDeletions++;
3118         block = chunkId / dev->nChunksPerBlock;
3119         page = chunkId % dev->nChunksPerBlock;
3120
3121         bi = yaffs_GetBlockInfo(dev,block);
3122
3123         T(YAFFS_TRACE_DELETION,(TSTR("line %d delete of chunk %d" TENDSTR),lyn,chunkId));
3124
3125         if(markNAND &&
3126           bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
3127           !dev->isYaffs2)
3128         {
3129 //              yaffs_SpareInitialise(&spare);
3130
3131 #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
3132
3133                 //read data before write, to ensure correct ecc
3134                 //if we're using MTD verification under Linux
3135                 yaffs_ReadChunkFromNAND(dev,chunkId,NULL,&spare,0);
3136 #endif
3137
3138                 yaffs_InitialiseTags(&tags);
3139
3140                 tags.chunkDeleted = 1;
3141
3142
3143                 yaffs_WriteChunkWithTagsToNAND(dev,chunkId,NULL,&tags);
3144                 yaffs_HandleUpdateChunk(dev,chunkId,&tags);
3145         }
3146         else
3147         {
3148                         dev->nUnmarkedDeletions++;
3149         }
3150
3151
3152         // Pull out of the management area.
3153         // If the whole block became dirty, this will kick off an erasure.
3154         if(     bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3155             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3156             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3157             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING)
3158         {
3159                 dev->nFreeChunks++;
3160
3161                 yaffs_ClearChunkBit(dev,block,page);
3162
3163                 bi->pagesInUse--;
3164
3165                 if(bi->pagesInUse == 0 &&
3166                    !bi->hasShrinkHeader &&
3167                bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3168                bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING)
3169             {
3170                 yaffs_BlockBecameDirty(dev,block);
3171             }
3172
3173         }
3174         else
3175         {
3176                 // T(("Bad news deleting chunk %d\n",chunkId));
3177         }
3178
3179 }
3180
3181
3182
3183
3184 int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)
3185 {
3186         // Find old chunk Need to do this to get serial number
3187         // Write new one and patch into tree.
3188         // Invalidate old tags.
3189
3190     int prevChunkId;
3191     yaffs_ExtendedTags prevTags;
3192
3193     int newChunkId;
3194     yaffs_ExtendedTags newTags;
3195
3196     yaffs_Device *dev = in->myDev;
3197
3198         yaffs_CheckGarbageCollection(dev);
3199
3200         // Get the previous chunk at this location in the file if it exists
3201     prevChunkId  = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);
3202
3203     // Set up new tags
3204     yaffs_InitialiseTags(&newTags);
3205
3206         newTags.chunkId = chunkInInode;
3207         newTags.objectId = in->objectId;
3208         newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3209         newTags.byteCount = nBytes;
3210
3211 //      yaffs_CalcTagsECC(&newTags);
3212
3213         newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve);
3214
3215         if(newChunkId >= 0)
3216         {
3217                 yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0);
3218
3219
3220                 if(prevChunkId >= 0)
3221                 {
3222                         yaffs_DeleteChunk(dev,prevChunkId,1,__LINE__);
3223
3224                 }
3225
3226                 yaffs_CheckFileSanity(in);
3227         }
3228         return newChunkId;
3229
3230
3231
3232
3233
3234 }
3235
3236
3237 // UpdateObjectHeader updates the header on NAND for an object.
3238 // If name is not NULL, then that new name is used.
3239 //
3240 int yaffs_UpdateObjectHeader(yaffs_Object *in,const YCHAR *name, int force,int isShrink)
3241 {
3242
3243         yaffs_BlockInfo *bi;
3244
3245         yaffs_Device *dev = in->myDev;
3246
3247     int prevChunkId;
3248     int retVal = 0;
3249
3250     int newChunkId;
3251     yaffs_ExtendedTags newTags;
3252
3253     __u8 *buffer = NULL;
3254     YCHAR oldName[YAFFS_MAX_NAME_LENGTH+1];
3255
3256    // __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
3257
3258     yaffs_ObjectHeader *oh = NULL;
3259     // yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
3260
3261
3262     if(!in->fake || force)
3263     {
3264
3265                 yaffs_CheckGarbageCollection(dev);
3266
3267             buffer = yaffs_GetTempBuffer(in->myDev,__LINE__);
3268             oh  = (yaffs_ObjectHeader *)buffer;
3269
3270                 prevChunkId = in->chunkId;
3271
3272                 if(prevChunkId >= 0)
3273                 {
3274                         yaffs_ReadChunkWithTagsFromNAND(dev,prevChunkId,buffer,NULL);
3275                         memcpy(oldName,oh->name,sizeof(oh->name));
3276                 }
3277
3278                 memset(buffer,0xFF,dev->nBytesPerChunk);
3279
3280                 // Header data
3281                 oh->type = in->variantType;
3282
3283                 oh->yst_mode = in->yst_mode;
3284
3285 #ifdef CONFIG_YAFFS_WINCE
3286                 oh->win_atime[0] = in->win_atime[0];
3287                 oh->win_ctime[0] = in->win_ctime[0];
3288                 oh->win_mtime[0] = in->win_mtime[0];
3289                 oh->win_atime[1] = in->win_atime[1];
3290                 oh->win_ctime[1] = in->win_ctime[1];
3291                 oh->win_mtime[1] = in->win_mtime[1];
3292 #else
3293                 oh->yst_uid = in->yst_uid;
3294                 oh->yst_gid = in->yst_gid;
3295                 oh->yst_atime = in->yst_atime;
3296                 oh->yst_mtime = in->yst_mtime;
3297                 oh->yst_ctime = in->yst_ctime;
3298                 oh->yst_rdev = in->yst_rdev;
3299 #endif
3300                 if(in->parent)
3301                 {
3302                         oh->parentObjectId = in->parent->objectId;
3303                 }
3304                 else
3305                 {
3306                         oh->parentObjectId = 0;
3307                 }
3308
3309                 //oh->sum = in->sum;
3310                 if(name && *name)
3311                 {
3312                         memset(oh->name,0,sizeof(oh->name));
3313                         yaffs_strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
3314                 }
3315                 else if(prevChunkId)
3316                 {
3317                         memcpy(oh->name, oldName,sizeof(oh->name));
3318                 }
3319                 else
3320                 {
3321                         memset(oh->name,0,sizeof(oh->name));
3322                 }
3323
3324                 oh->isShrink = isShrink;
3325
3326                 switch(in->variantType)
3327                 {
3328                         case YAFFS_OBJECT_TYPE_UNKNOWN:
3329                                 // Should not happen
3330                                 break;
3331                         case YAFFS_OBJECT_TYPE_FILE:
3332                                 oh->fileSize = (oh->parentObjectId == YAFFS_OBJECTID_DELETED ||
3333                                                 oh->parentObjectId == YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.fileVariant.fileSize;
3334                                 break;
3335                         case YAFFS_OBJECT_TYPE_HARDLINK:
3336                                 oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId;
3337                                 break;
3338                         case YAFFS_OBJECT_TYPE_SPECIAL:
3339                                 // Do nothing
3340                                 break;
3341                         case YAFFS_OBJECT_TYPE_DIRECTORY:
3342                                 // Do nothing
3343                                 break;
3344                         case YAFFS_OBJECT_TYPE_SYMLINK:
3345                                 yaffs_strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
3346                                 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3347                                 break;
3348                 }
3349
3350                 // Tags
3351                 yaffs_InitialiseTags(&newTags);
3352                 in->serial++;
3353                 newTags.chunkId = 0;
3354                 newTags.objectId = in->objectId;
3355                 newTags.serialNumber = in->serial;
3356
3357                 // Add extra info for file header
3358
3359                 newTags.extraHeaderInfoAvailable = 1;
3360                 newTags.extraParentObjectId = oh->parentObjectId;
3361                 newTags.extraFileLength = oh->fileSize;
3362                 newTags.extraIsShrinkHeader = oh->isShrink;
3363                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3364                 newTags.extraObjectType  = in->variantType;
3365
3366                 // Create new chunk in NAND
3367                 newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags, (prevChunkId >= 0) ? 1 : 0 );
3368
3369                 if(newChunkId >= 0)
3370                 {
3371
3372                         in->chunkId = newChunkId;
3373
3374                         if(prevChunkId >= 0)
3375                         {
3376                                 yaffs_DeleteChunk(dev,prevChunkId,1,__LINE__);
3377                         }
3378
3379                         in->dirty = 0;
3380
3381                         // If this was a shrink, then mark the block that the chunk lives on
3382                         if(isShrink)
3383                         {
3384                                 bi = yaffs_GetBlockInfo(in->myDev,newChunkId / in->myDev->nChunksPerBlock);
3385                                 bi->hasShrinkHeader = 1;
3386                         }
3387
3388                 }
3389
3390                 retVal =  newChunkId;
3391
3392     }
3393
3394         if(buffer)
3395                 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
3396
3397     return retVal;
3398 }
3399
3400
3401 /////////////////////// Short Operations Cache ////////////////////////////////
3402 //      In many siturations where there is no high level buffering (eg WinCE) a lot of
3403 //      reads might be short sequential reads, and a lot of writes may be short
3404 //  sequential writes. eg. scanning/writing a jpeg file.
3405 //      In these cases, a short read/write cache can provide a huge perfomance benefit
3406 //  with dumb-as-a-rock code.
3407 //  There are a limited number (~10) of cache chunks per device so that we don't
3408 //  need a very intelligent search.
3409
3410
3411
3412
3413
3414 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3415 {
3416         yaffs_Device *dev = obj->myDev;
3417         int lowest;
3418         int i;
3419         yaffs_ChunkCache *cache;
3420         int chunkWritten = 0;
3421         //int nBytes;
3422         int nCaches = obj->myDev->nShortOpCaches;
3423
3424         if  (nCaches > 0)
3425         {
3426                 do{
3427                         cache = NULL;
3428
3429                         // Find the dirty cache for this object with the lowest chunk id.
3430                         for(i = 0; i < nCaches; i++)
3431                         {
3432                                 if(dev->srCache[i].object == obj &&
3433                                    dev->srCache[i].dirty)
3434                                 {
3435                                         if(!cache ||  dev->srCache[i].chunkId < lowest)
3436                                         {
3437                                                 cache = &dev->srCache[i];
3438                                                 lowest = cache->chunkId;
3439                                         }
3440                                 }
3441                         }
3442
3443                         if(cache && !cache->locked)
3444                         {
3445                                 //Write it out and free it up
3446
3447 #if 0
3448                                 nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
3449
3450                                 if(nBytes > YAFFS_BYTES_PER_CHUNK)
3451                                 {
3452                                         nBytes= YAFFS_BYTES_PER_CHUNK;
3453                                 }
3454 #endif
3455                                 chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
3456                                                                                                                         cache->chunkId,
3457                                                                                                                         cache->data,
3458                                                                                                                         cache->nBytes,1);
3459
3460                                 cache->dirty = 0;
3461                                 cache->object = NULL;
3462                         }
3463
3464                 } while(cache && chunkWritten > 0);
3465
3466                 if(cache)
3467                 {
3468                         //Hoosterman, disk full while writing cache out.
3469                         T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3470
3471                 }
3472         }
3473
3474 }
3475
3476
3477 // Grab us a chunk for use.
3478 // First look for an empty one.
3479 // Then look for the least recently used non-dirty one.
3480 // Then look for the least recently used dirty one...., flush and look again.
3481 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3482 {
3483         int i;
3484         int usage;
3485         int theOne;
3486
3487         if(dev->nShortOpCaches > 0)
3488         {
3489                 for(i = 0; i < dev->nShortOpCaches; i++)
3490                 {
3491                         if(!dev->srCache[i].object)
3492                         {
3493                                 //T(("Grabbing empty %d\n",i));
3494
3495                                 //printf("Grabbing empty %d\n",i);
3496
3497                                 return &dev->srCache[i];
3498                         }
3499                 }
3500
3501                 return NULL;
3502
3503                 theOne = -1;
3504                 usage = 0; // just to stop the compiler grizzling
3505
3506                 for(i = 0; i < dev->nShortOpCaches; i++)
3507                 {
3508                         if(!dev->srCache[i].dirty &&
3509                         ((dev->srCache[i].lastUse < usage  && theOne >= 0)||
3510                                 theOne < 0))
3511                         {
3512                                 usage = dev->srCache[i].lastUse;
3513                                 theOne = i;
3514                         }
3515                 }
3516
3517                 //T(("Grabbing non-empty %d\n",theOne));
3518
3519                 //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne);
3520
3521                 return  theOne >= 0 ?  &dev->srCache[theOne] : NULL;
3522         }
3523         else
3524         {
3525                 return NULL;
3526         }
3527
3528 }
3529
3530
3531 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3532 {
3533         yaffs_ChunkCache *cache;
3534         yaffs_Object *theObj;
3535         int usage;
3536         int i;
3537         int pushout;
3538
3539         if(dev->nShortOpCaches > 0)
3540         {
3541                 // Try find a non-dirty one...
3542
3543                 cache = yaffs_GrabChunkCacheWorker(dev);
3544
3545                 if(!cache)
3546                 {
3547                         // They were all dirty, find the last recently used object and flush
3548                         // its cache, then  find again.
3549                         // NB what's here is not very accurate, we actually flush the object
3550                         // the last recently used page.
3551
3552                         // With locking we can't assume we can use entry zero
3553
3554
3555                         theObj = NULL;
3556                         usage = -1;
3557                         cache = NULL;
3558                         pushout = -1;
3559
3560                         for(i = 0; i < dev->nShortOpCaches; i++)
3561                         {
3562                                 if( dev->srCache[i].object &&
3563                                         !dev->srCache[i].locked &&
3564                                         (dev->srCache[i].lastUse < usage || !cache))
3565                                 {
3566                                         usage  = dev->srCache[i].lastUse;
3567                                         theObj = dev->srCache[i].object;
3568                                         cache = &dev->srCache[i];
3569                                         pushout = i;
3570                                 }
3571                         }
3572
3573                         if(!cache || cache->dirty)
3574                         {
3575
3576                                 //printf("Dirty ");
3577                                 yaffs_FlushFilesChunkCache(theObj);
3578
3579                                 // Try again
3580                                 cache = yaffs_GrabChunkCacheWorker(dev);
3581                         }
3582                         else
3583                         {
3584                                 //printf(" pushout %d\n",pushout);
3585                         }
3586
3587                 }
3588                 return cache;
3589         }
3590         else
3591                 return NULL;
3592
3593 }
3594
3595
3596 // Find a cached chunk
3597 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)
3598 {
3599         yaffs_Device *dev = obj->myDev;
3600         int i;
3601         if(dev->nShortOpCaches > 0)
3602         {
3603                 for(i = 0; i < dev->nShortOpCaches; i++)
3604                 {
3605                         if(dev->srCache[i].object == obj &&
3606                         dev->srCache[i].chunkId == chunkId)
3607                         {
3608                                 dev->cacheHits++;
3609
3610                                 return &dev->srCache[i];
3611                         }
3612                 }
3613         }
3614         return NULL;
3615 }
3616
3617 // Mark the chunk for the least recently used algorithym
3618 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)
3619 {
3620
3621         if(dev->nShortOpCaches > 0)
3622         {
3623                 if( dev->srLastUse < 0 ||
3624                         dev->srLastUse > 100000000)
3625                 {
3626                         // Reset the cache usages
3627                         int i;
3628                         for(i = 1; i < dev->nShortOpCaches; i++)
3629                         {
3630                                 dev->srCache[i].lastUse = 0;
3631                         }
3632                         dev->srLastUse = 0;
3633                 }
3634
3635                 dev->srLastUse++;
3636
3637                 cache->lastUse = dev->srLastUse;
3638
3639                 if(isAWrite)
3640                 {
3641                         cache->dirty = 1;
3642                 }
3643         }
3644 }
3645
3646 // Invalidate a single cache page.
3647 // Do this when a whole page gets written,
3648 // ie the short cache for this page is no longer valid.
3649 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
3650 {
3651         if(object->myDev->nShortOpCaches > 0)
3652         {
3653                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);
3654
3655                 if(cache)
3656                 {
3657                         cache->object = NULL;
3658                 }
3659         }
3660 }
3661
3662
3663 // Invalidate all the cache pages associated with this object
3664 // Do this whenever ther file is deleted or resized.
3665 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
3666 {
3667         int i;
3668         yaffs_Device *dev = in->myDev;
3669
3670         if(dev->nShortOpCaches > 0)
3671         {
3672                 // Now invalidate it.
3673                 for(i = 0; i < dev->nShortOpCaches; i++)
3674                 {
3675                         if(dev->srCache[i].object == in)
3676                         {
3677                                 dev->srCache[i].object = NULL;
3678                         }
3679                 }
3680         }
3681 }
3682
3683
3684
3685
3686
3687 ///////////////////////// File read/write ///////////////////////////////
3688 // Read and write have very similar structures.
3689 // In general the read/write has three parts to it
3690 // * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3691 // * Some complete chunks
3692 // * An incomplete chunk to end off with
3693 //
3694 // Curve-balls: the first chunk might also be the last chunk.
3695
3696 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)
3697 {
3698
3699
3700         int chunk;
3701         int start;
3702         int nToCopy;
3703         int n = nBytes;
3704         int nDone = 0;
3705         yaffs_ChunkCache *cache;
3706
3707         yaffs_Device *dev;
3708
3709         dev = in->myDev;
3710
3711         while(n > 0)
3712         {
3713                 chunk = offset / dev->nBytesPerChunk + 1; // The first chunk is 1
3714                 start = offset % dev->nBytesPerChunk;
3715
3716                 // OK now check for the curveball where the start and end are in
3717                 // the same chunk.
3718                 if(     (start + n) < dev->nBytesPerChunk)
3719                 {
3720                         nToCopy = n;
3721                 }
3722                 else
3723                 {
3724                         nToCopy = dev->nBytesPerChunk - start;
3725                 }
3726
3727                 cache = yaffs_FindChunkCache(in,chunk);
3728
3729                 // If the chunk is already in the cache or it is less than a whole chunk
3730                 // then use the cache (if there is caching)
3731                 // else bypass the cache.
3732                 if( cache || nToCopy != dev->nBytesPerChunk)
3733                 {
3734                         if(dev->nShortOpCaches > 0)
3735                         {
3736
3737                                 // If we can't find the data in the cache, then load it up.
3738
3739                                 if(!cache)
3740                                 {
3741                                         cache = yaffs_GrabChunkCache(in->myDev);
3742                                         cache->object = in;
3743                                         cache->chunkId = chunk;
3744                                         cache->dirty = 0;
3745                                         cache->locked = 0;
3746                                         yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3747                                         cache->nBytes = 0;
3748                                 }
3749
3750                                 yaffs_UseChunkCache(dev,cache,0);
3751
3752                                 cache->locked = 1;
3753
3754 #ifdef CONFIG_YAFFS_WINCE
3755                                 yfsd_UnlockYAFFS(TRUE);
3756 #endif
3757                                 memcpy(buffer,&cache->data[start],nToCopy);
3758
3759 #ifdef CONFIG_YAFFS_WINCE
3760                                 yfsd_LockYAFFS(TRUE);
3761 #endif
3762                                 cache->locked = 0;
3763                         }
3764                         else
3765                         {
3766                                 // Read into the local buffer then copy...
3767
3768                                 __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
3769                                 yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
3770 #ifdef CONFIG_YAFFS_WINCE
3771                                 yfsd_UnlockYAFFS(TRUE);
3772 #endif
3773                                 memcpy(buffer,&localBuffer[start],nToCopy);
3774
3775 #ifdef CONFIG_YAFFS_WINCE
3776                                 yfsd_LockYAFFS(TRUE);
3777 #endif
3778                                 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
3779                         }
3780
3781                 }
3782                 else
3783                 {
3784 #ifdef CONFIG_YAFFS_WINCE
3785                         __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
3786
3787                         // Under WinCE can't do direct transfer. Need to use a local buffer.
3788                         // This is because we otherwise screw up WinCE's memory mapper
3789                         yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
3790
3791 #ifdef CONFIG_YAFFS_WINCE
3792                                 yfsd_UnlockYAFFS(TRUE);
3793 #endif
3794                         memcpy(buffer,localBuffer,dev->nBytesPerChunk);
3795
3796 #ifdef CONFIG_YAFFS_WINCE
3797                                 yfsd_LockYAFFS(TRUE);
3798                                 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
3799 #endif
3800
3801 #else
3802                         // A full chunk. Read directly into the supplied buffer.
3803                         yaffs_ReadChunkDataFromObject(in,chunk,buffer);
3804 #endif
3805                 }
3806
3807                 n -= nToCopy;
3808                 offset += nToCopy;
3809                 buffer += nToCopy;
3810                 nDone += nToCopy;
3811
3812         }
3813
3814         return nDone;
3815 }
3816
3817
3818
3819 int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes, int writeThrough)
3820 {
3821
3822         int chunk;
3823         int start;
3824         int nToCopy;
3825         int n = nBytes;
3826         int nDone = 0;
3827         int nToWriteBack;
3828         int startOfWrite = offset;
3829         int chunkWritten = 0;
3830         int nBytesRead;
3831
3832         yaffs_Device *dev;
3833
3834         dev = in->myDev;
3835
3836
3837         while(n > 0 && chunkWritten >= 0)
3838         {
3839                 chunk = offset / dev->nBytesPerChunk + 1;
3840                 start = offset % dev->nBytesPerChunk;
3841
3842
3843                 // OK now check for the curveball where the start and end are in
3844                 // the same chunk.
3845
3846                 if((start + n) < dev->nBytesPerChunk)
3847                 {
3848                         nToCopy = n;
3849
3850                         // Now folks, to calculate how many bytes to write back....
3851                         // If we're overwriting and not writing to then end of file then
3852                         // we need to write back as much as was there before.
3853
3854                         nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * dev->nBytesPerChunk);
3855
3856                         if(nBytesRead > dev->nBytesPerChunk)
3857                         {
3858                                 nBytesRead = dev->nBytesPerChunk;
3859                         }
3860
3861                         nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
3862
3863                 }
3864                 else
3865                 {
3866                         nToCopy = dev->nBytesPerChunk - start;
3867                         nToWriteBack = dev->nBytesPerChunk;
3868                 }
3869
3870                 if(nToCopy != dev->nBytesPerChunk)
3871                 {
3872                         // An incomplete start or end chunk (or maybe both start and end chunk)
3873                         if(dev->nShortOpCaches > 0)
3874                            {
3875                                 yaffs_ChunkCache *cache;
3876                                 // If we can't find the data in the cache, then load it up.
3877                                 cache = yaffs_FindChunkCache(in,chunk);
3878                                 if(!cache && yaffs_CheckSpaceForAllocation(in->myDev))
3879                                 {
3880                                         cache = yaffs_GrabChunkCache(in->myDev);
3881                                         cache->object = in;
3882                                         cache->chunkId = chunk;
3883                                         cache->dirty = 0;
3884                                         cache->locked = 0;
3885                                         yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3886                                 }
3887
3888                                 if(cache)
3889                                 {
3890                                         yaffs_UseChunkCache(dev,cache,1);
3891                                         cache->locked = 1;
3892 #ifdef CONFIG_YAFFS_WINCE
3893                                 yfsd_UnlockYAFFS(TRUE);
3894 #endif
3895
3896                                         memcpy(&cache->data[start],buffer,nToCopy);
3897
3898 #ifdef CONFIG_YAFFS_WINCE
3899                                 yfsd_LockYAFFS(TRUE);
3900 #endif
3901                                         cache->locked = 0;
3902                                         cache->nBytes = nToWriteBack;
3903
3904                                         if(writeThrough)
3905                                         {
3906                                                 chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
3907                                                                                             cache->chunkId,
3908                                                                                             cache->data,
3909                                                                                             cache->nBytes,1);
3910                                                 cache->dirty = 0;
3911                                         }
3912
3913                                 }
3914                                 else
3915                                 {
3916                                         chunkWritten = -1; // fail the write
3917                                 }
3918                         }
3919                         else
3920                         {
3921                                 // An incomplete start or end chunk (or maybe both start and end chunk)
3922                                 // Read into the local buffer then copy, then copy over and write back.
3923
3924                                 __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
3925
3926                                 yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
3927
3928 #ifdef CONFIG_YAFFS_WINCE
3929                                 yfsd_UnlockYAFFS(TRUE);
3930 #endif
3931
3932                                 memcpy(&localBuffer[start],buffer,nToCopy);
3933
3934 #ifdef CONFIG_YAFFS_WINCE
3935                                 yfsd_LockYAFFS(TRUE);
3936 #endif
3937                                 chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0);
3938
3939                                 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
3940
3941                                 //T(("Write with readback to chunk %d %d  start %d  copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
3942                         }
3943
3944                 }
3945                 else
3946                 {
3947
3948 #ifdef CONFIG_YAFFS_WINCE
3949                         // Under WinCE can't do direct transfer. Need to use a local buffer.
3950                         // This is because we otherwise screw up WinCE's memory mapper
3951                                 __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
3952 #ifdef CONFIG_YAFFS_WINCE
3953                                 yfsd_UnlockYAFFS(TRUE);
3954 #endif
3955                         memcpy(localBuffer,buffer,dev->nBytesPerChunk);
3956 #ifdef CONFIG_YAFFS_WINCE
3957                                 yfsd_LockYAFFS(TRUE);
3958 #endif
3959                         chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,dev->nBytesPerChunk,0);
3960                         yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
3961 #else
3962                         // A full chunk. Write directly from the supplied buffer.
3963                         chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,dev->nBytesPerChunk,0);
3964 #endif
3965                         // Since we've overwritten the cached data, we better invalidate it.
3966                         yaffs_InvalidateChunkCache(in,chunk);
3967                         //T(("Write to chunk %d %d\n",chunk,chunkWritten));
3968                 }
3969
3970                 if(chunkWritten >= 0)
3971                 {
3972                         n -= nToCopy;
3973                         offset += nToCopy;
3974                         buffer += nToCopy;
3975                         nDone += nToCopy;
3976                 }
3977
3978         }
3979
3980         // Update file object
3981
3982         if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
3983         {
3984                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3985         }
3986
3987         in->dirty = 1;
3988
3989         return nDone;
3990 }
3991
3992 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
3993 {
3994
3995         yaffs_Device *dev = in->myDev;
3996         int oldFileSize = in->variant.fileVariant.fileSize;
3997
3998
3999         int lastDel = 1 + (oldFileSize-1)/dev->nBytesPerChunk;
4000
4001         int startDel = 1 + (newSize + dev->nBytesPerChunk - 1)/
4002                                                 dev->nBytesPerChunk;
4003         int i;
4004         int chunkId;
4005
4006         // Delete backwards so that we don't end up with holes if
4007         // power is lost part-way through the operation.
4008         for(i = lastDel; i >= startDel; i--)
4009         {
4010                 // NB this could be optimised somewhat,
4011                 // eg. could retrieve the tags and write them without
4012                 // using yaffs_DeleteChunk
4013
4014                 chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);
4015                 if(chunkId > 0)
4016                 {
4017                         if(chunkId < (dev->internalStartBlock * dev->nChunksPerBlock) ||
4018                        chunkId >= ((dev->internalEndBlock+1) * dev->nChunksPerBlock))
4019                         {
4020                                 T(YAFFS_TRACE_ALWAYS,(TSTR("Found daft chunkId %d for %d"TENDSTR),chunkId,i));
4021                         }
4022                         else
4023                         {
4024                                 in->nDataChunks--;
4025                                 yaffs_DeleteChunk(dev,chunkId,1,__LINE__);
4026                         }
4027                 }
4028         }
4029
4030 }
4031
4032 int yaffs_ResizeFile(yaffs_Object *in, int newSize)
4033 {
4034
4035         int oldFileSize = in->variant.fileVariant.fileSize;
4036         int sizeOfPartialChunk;
4037         yaffs_Device *dev = in->myDev;
4038
4039          sizeOfPartialChunk  = newSize % dev->nBytesPerChunk;
4040
4041
4042         yaffs_FlushFilesChunkCache(in);
4043         yaffs_InvalidateWholeChunkCache(in);
4044
4045         yaffs_CheckGarbageCollection(dev);
4046
4047         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
4048         {
4049                 return yaffs_GetFileSize(in);
4050         }
4051
4052         if(newSize < oldFileSize)
4053         {
4054
4055                 yaffs_PruneResizedChunks(in,newSize);
4056
4057                 if(sizeOfPartialChunk != 0)
4058                 {
4059                         int lastChunk = 1+ newSize/dev->nBytesPerChunk;
4060                         __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
4061
4062                         // Got to read and rewrite the last chunk with its new size and zero pad
4063                         yaffs_ReadChunkDataFromObject(in,lastChunk,localBuffer);
4064
4065                         memset(localBuffer + sizeOfPartialChunk,0, dev->nBytesPerChunk - sizeOfPartialChunk);
4066
4067                         yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfPartialChunk,1);
4068
4069                         yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
4070                 }
4071
4072                 in->variant.fileVariant.fileSize = newSize;
4073
4074                 yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
4075
4076                 // Write a new object header to show we've shrunk the file
4077                 // Do this only if the file is not in the deleted directories.
4078                 if(in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
4079                    in->parent->objectId != YAFFS_OBJECTID_DELETED
4080                   )
4081                 {
4082                         yaffs_UpdateObjectHeader(in,NULL, 0, 1);
4083                 }
4084
4085
4086                 return newSize;
4087
4088         }
4089         else
4090         {
4091                 return oldFileSize;
4092         }
4093 }
4094
4095
4096 loff_t yaffs_GetFileSize(yaffs_Object *obj)
4097 {
4098         obj = yaffs_GetEquivalentObject(obj);
4099
4100         switch(obj->variantType)
4101         {
4102                 case YAFFS_OBJECT_TYPE_FILE:
4103                         return obj->variant.fileVariant.fileSize;
4104                 case YAFFS_OBJECT_TYPE_SYMLINK:
4105                         return yaffs_strlen(obj->variant.symLinkVariant.alias);
4106                 default:
4107                         return 0;
4108         }
4109 }
4110
4111
4112
4113 // yaffs_FlushFile() updates the file's
4114 // objectId in NAND
4115
4116 int yaffs_FlushFile(yaffs_Object *in, int updateTime)
4117 {
4118         int retVal;
4119         if(in->dirty)
4120         {
4121                 //T(("flushing object header\n"));
4122
4123                 yaffs_FlushFilesChunkCache(in);
4124                 if(updateTime)
4125                 {
4126 #ifdef CONFIG_YAFFS_WINCE
4127                         yfsd_WinFileTimeNow(in->win_mtime);
4128 #else
4129
4130                         in->yst_mtime = Y_CURRENT_TIME;
4131
4132 #endif
4133                 }
4134
4135                 retVal = (yaffs_UpdateObjectHeader(in,NULL,0,0) >= 0)? YAFFS_OK : YAFFS_FAIL;
4136         }
4137         else
4138         {
4139                 retVal = YAFFS_OK;
4140         }
4141
4142         return retVal;
4143
4144 }
4145
4146
4147 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
4148 {
4149
4150         // First off, invalidate the file's data in the cache, without flushing.
4151         yaffs_InvalidateWholeChunkCache(in);
4152
4153         if(in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir))
4154         {
4155                 // Move to the unlinked directory so we have a record that it was deleted.
4156                 yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0);
4157
4158         }
4159
4160
4161         yaffs_RemoveObjectFromDirectory(in);
4162         yaffs_DeleteChunk(in->myDev,in->chunkId,1,__LINE__);
4163         in->chunkId = -1;
4164 #if 0
4165 #ifdef __KERNEL__
4166         if(in->myInode)
4167         {
4168                 in->myInode->u.generic_ip = NULL;
4169                 in->myInode = 0;
4170         }
4171 #endif
4172 #endif
4173
4174         yaffs_FreeObject(in);
4175         return YAFFS_OK;
4176
4177 }
4178
4179 // yaffs_DeleteFile deletes the whole file data
4180 // and the inode associated with the file.
4181 // It does not delete the links associated with the file.
4182 static int yaffs_UnlinkFile(yaffs_Object *in)
4183 {
4184
4185 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
4186
4187         // Delete the file data & tnodes
4188
4189          yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
4190
4191
4192         yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
4193
4194         return  yaffs_DoGenericObjectDeletion(in);
4195 #else
4196         int retVal;
4197         int immediateDeletion=0;
4198
4199         if(1)
4200         {
4201                 //in->unlinked = 1;
4202                 //in->myDev->nUnlinkedFiles++;
4203                 //in->renameAllowed = 0;
4204 #ifdef __KERNEL__
4205                 if(!in->myInode)
4206                 {
4207                         immediateDeletion = 1;
4208
4209                 }
4210 #else
4211                 if(in->inUse <= 0)
4212                 {
4213                         immediateDeletion = 1;
4214
4215                 }
4216 #endif
4217                 if(immediateDeletion)
4218                 {
4219                         retVal = yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0);
4220                         T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
4221                         in->deleted=1;
4222                         in->myDev->nDeletedFiles++;
4223                         if( 0 && in->myDev->isYaffs2)
4224                         {
4225                                 yaffs_ResizeFile(in,0);
4226                         }
4227                         yaffs_SoftDeleteFile(in);
4228                 }
4229                 else
4230                 {
4231                         retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0);
4232                 }
4233
4234         }
4235         return retVal;
4236
4237
4238 #endif
4239 }
4240
4241 int yaffs_DeleteFile(yaffs_Object *in)
4242 {
4243         int retVal = YAFFS_OK;
4244
4245         if(in->nDataChunks > 0)
4246         {
4247                 // Use soft deletion
4248                 if(!in->unlinked)
4249                 {
4250                         retVal = yaffs_UnlinkFile(in);
4251                 }
4252                 if(retVal == YAFFS_OK &&
4253                 in->unlinked &&
4254                 !in->deleted)
4255                 {
4256                         in->deleted = 1;
4257                         in->myDev->nDeletedFiles++;
4258                         yaffs_SoftDeleteFile(in);
4259                 }
4260                 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
4261         }
4262         else
4263         {
4264                 // The file has no data chunks so we toss it immediately
4265                 yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
4266                 in->variant.fileVariant.top = NULL;
4267                 yaffs_DoGenericObjectDeletion(in);
4268
4269                 return YAFFS_OK;
4270         }
4271 }
4272
4273 static int yaffs_DeleteDirectory(yaffs_Object *in)
4274 {
4275         //First check that the directory is empty.
4276         if(list_empty(&in->variant.directoryVariant.children))
4277         {
4278                 return  yaffs_DoGenericObjectDeletion(in);
4279         }
4280
4281         return YAFFS_FAIL;
4282
4283 }
4284
4285 static int yaffs_DeleteSymLink(yaffs_Object *in)
4286 {
4287         YFREE(in->variant.symLinkVariant.alias);
4288
4289         return  yaffs_DoGenericObjectDeletion(in);
4290 }
4291
4292 static int yaffs_DeleteHardLink(yaffs_Object *in)
4293 {
4294         // remove this hardlink from the list assocaited with the equivalent
4295         // object
4296         list_del(&in->hardLinks);
4297         return  yaffs_DoGenericObjectDeletion(in);
4298 }
4299
4300
4301 static void yaffs_DestroyObject(yaffs_Object *obj)
4302 {
4303         switch(obj->variantType)
4304         {
4305                 case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break;
4306                 case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break;
4307                 case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break;
4308                 case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break;
4309                 case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break;
4310                 case YAFFS_OBJECT_TYPE_UNKNOWN: break; // should not happen.
4311         }
4312 }
4313
4314
4315 static int yaffs_UnlinkWorker(yaffs_Object *obj)
4316 {
4317
4318
4319         if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4320         {
4321                 return  yaffs_DeleteHardLink(obj);
4322         }
4323         else if(!list_empty(&obj->hardLinks))
4324         {
4325                 // Curve ball: We're unlinking an object that has a hardlink.
4326                 //
4327                 //      This problem arises because we are not strictly following
4328                 //  The Linux link/inode model.
4329                 //
4330                 // We can't really delete the object.
4331                 // Instead, we do the following:
4332                 // - Select a hardlink.
4333                 // - Unhook it from the hard links
4334                 // - Unhook it from its parent directory (so that the rename can work)
4335                 // - Rename the object to the hardlink's name.
4336                 // - Delete the hardlink
4337
4338
4339                 yaffs_Object *hl;
4340                 int retVal;
4341                 YCHAR name[YAFFS_MAX_NAME_LENGTH+1];
4342
4343                 hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);
4344
4345                 list_del_init(&hl->hardLinks);
4346                 list_del_init(&hl->siblings);
4347
4348                 yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);
4349
4350                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0);
4351
4352                 if(retVal == YAFFS_OK)
4353                 {
4354                         retVal = yaffs_DoGenericObjectDeletion(hl);
4355                 }
4356                 return retVal;
4357
4358         }
4359         else
4360         {
4361                 switch(obj->variantType)
4362                 {
4363                         case YAFFS_OBJECT_TYPE_FILE:
4364                                 return yaffs_UnlinkFile(obj);
4365                                 break;
4366                         case YAFFS_OBJECT_TYPE_DIRECTORY:
4367                                 return yaffs_DeleteDirectory(obj);
4368                                 break;
4369                         case YAFFS_OBJECT_TYPE_SYMLINK:
4370                                 return yaffs_DeleteSymLink(obj);
4371                                 break;
4372                         case YAFFS_OBJECT_TYPE_SPECIAL:
4373                                 return yaffs_DoGenericObjectDeletion(obj);
4374                                 break;
4375                         case YAFFS_OBJECT_TYPE_HARDLINK:
4376                         case YAFFS_OBJECT_TYPE_UNKNOWN:
4377                         default:
4378                                 return YAFFS_FAIL;
4379                 }
4380         }
4381 }
4382
4383 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
4384 {
4385         yaffs_Object *obj;
4386
4387          obj = yaffs_FindObjectByName(dir,name);
4388
4389          if(obj && obj->unlinkAllowed)
4390          {
4391                 return yaffs_UnlinkWorker(obj);
4392          }
4393
4394          return YAFFS_FAIL;
4395
4396 }
4397
4398 //////////////// Initialisation Scanning /////////////////
4399
4400
4401 #if 0
4402 // For now we use the SmartMedia check.
4403 // We look at the blockStatus byte in the first two chunks
4404 // These must be 0xFF to pass as OK.
4405 // todo: this function needs to be modifyable foir different NAND types
4406 // and different chunk sizes.  Suggest make this into a per-device configurable
4407 // function.
4408 static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
4409 {
4410         yaffsExtendedTags *tags;
4411
4412         yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock,NULL,&tags,1);
4413 #if 1
4414         if(yaffs_CountBits(spare.blockStatus) < 7)
4415         {
4416                 return 1;
4417         }
4418 #else
4419         if(spare.blockStatus != 0xFF)
4420         {
4421                 return 1;
4422         }
4423 #endif
4424         yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock + 1,NULL,&spare,1);
4425
4426 #if 1
4427         if(yaffs_CountBits(spare.blockStatus) < 7)
4428         {
4429                 return 1;
4430         }
4431 #else
4432         if(spare.blockStatus != 0xFF)
4433         {
4434                 return 1;
4435         }
4436 #endif
4437
4438         return 0;
4439
4440 }
4441
4442 #endif
4443
4444
4445 typedef struct
4446 {
4447         int seq;
4448         int block;
4449 } yaffs_BlockIndex;
4450
4451
4452
4453 static int yaffs_Scan(yaffs_Device *dev)
4454 {
4455         yaffs_ExtendedTags tags;
4456         int blk;
4457         int blockIterator;
4458         int startIterator;
4459         int endIterator;
4460         int nBlocksToScan = 0;
4461
4462         int chunk;
4463         int c;
4464         int deleted;
4465         yaffs_BlockState state;
4466         yaffs_Object *hardList = NULL;
4467         yaffs_Object *hl;
4468         yaffs_BlockInfo *bi;
4469         int sequenceNumber;
4470         yaffs_ObjectHeader *oh;
4471         yaffs_Object *in;
4472         yaffs_Object *parent;
4473         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4474
4475         __u8 *chunkData;
4476
4477         yaffs_BlockIndex *blockIndex = NULL;
4478
4479         T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),dev->internalStartBlock,dev->internalEndBlock));
4480
4481         chunkData = yaffs_GetTempBuffer(dev,__LINE__);
4482
4483
4484         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4485
4486         if(dev->isYaffs2)
4487         {
4488                 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4489         }
4490
4491
4492         // Scan all the blocks to determine their state
4493         for(blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++)
4494         {
4495                 bi = yaffs_GetBlockInfo(dev,blk);
4496                 yaffs_ClearChunkBits(dev,blk);
4497                 bi->pagesInUse = 0;
4498                 bi->softDeletions = 0;
4499
4500                 yaffs_QueryInitialBlockState(dev,blk,&state,&sequenceNumber);
4501
4502                 bi->blockState = state;
4503                 bi->sequenceNumber = sequenceNumber;
4504
4505                 T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block scanning block %d state %d seq %d" TENDSTR),blk,state,sequenceNumber));
4506
4507                 if(state == YAFFS_BLOCK_STATE_DEAD)
4508                 {
4509                         T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
4510                 }
4511                 else if(state == YAFFS_BLOCK_STATE_EMPTY)
4512                 {
4513                         T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block empty " TENDSTR)));
4514                         dev->nErasedBlocks++;
4515                         dev->nFreeChunks += dev->nChunksPerBlock;
4516                 }
4517                 else if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
4518                 {
4519
4520                         // Determine the highest sequence number
4521                         if( dev->isYaffs2 &&
4522                             sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4523                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER)
4524                          {
4525
4526                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
4527                                 blockIndex[nBlocksToScan].block = blk;
4528
4529                                 nBlocksToScan++;
4530
4531                                 if(sequenceNumber >= dev->sequenceNumber)
4532                                 {
4533                                         dev->sequenceNumber = sequenceNumber;
4534                                 }
4535                         }
4536                         else if(dev->isYaffs2)
4537                         {
4538                                 // TODO: Nasty sequence number!
4539                                 T(YAFFS_TRACE_SCAN,(TSTR("Block scanning block %d has bad sequence number %d" TENDSTR),blk,sequenceNumber));
4540
4541                         }
4542                 }
4543         }
4544
4545         // Sort the blocks
4546         // Dungy old bubble sort for now...
4547         if(dev->isYaffs2)
4548         {
4549                 yaffs_BlockIndex temp;
4550                 int i;
4551                 int j;
4552
4553                 for(i = 0; i < nBlocksToScan; i++)
4554                         for(j = i+1; j < nBlocksToScan; j++)
4555                          if(blockIndex[i].seq > blockIndex[j].seq)
4556                          {
4557                                 temp = blockIndex[j];
4558                                 blockIndex[j] = blockIndex[i];
4559                                 blockIndex[i] = temp;
4560                          }
4561         }
4562
4563
4564         // Now scan the blocks looking at the data.
4565         if(dev->isYaffs2)
4566         {
4567                 startIterator = 0;
4568                 endIterator = nBlocksToScan-1;
4569                 T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("%d blocks to be scanned" TENDSTR),nBlocksToScan));
4570         }
4571         else
4572         {
4573                 startIterator = dev->internalStartBlock;
4574                 endIterator = dev->internalEndBlock;
4575         }
4576
4577         // For each block....
4578         for(blockIterator = startIterator; blockIterator <= endIterator; blockIterator++)
4579         {
4580
4581                 if(dev->isYaffs2)
4582                 {
4583                         // get the block to scan in the correct order
4584                         blk = blockIndex[blockIterator].block;
4585                 }
4586                 else
4587                 {
4588                         blk = blockIterator;
4589                 }
4590
4591
4592                 bi = yaffs_GetBlockInfo(dev,blk);
4593                 state = bi->blockState;
4594
4595                 deleted = 0;
4596
4597                 // For each chunk in each block that needs scanning....
4598                 for(c = 0; c < dev->nChunksPerBlock &&
4599                                    state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++)
4600                 {
4601                         // Read the tags and decide what to do
4602                         chunk = blk * dev->nChunksPerBlock + c;
4603
4604                         yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
4605
4606                         // Let's have a good look at this chunk...
4607
4608
4609                         if(!dev->isYaffs2 && tags.chunkDeleted)
4610                         {
4611                                 // YAFFS1 only...
4612                                 // A deleted chunk
4613                                 deleted++;
4614                                 dev->nFreeChunks ++;
4615                                 //T((" %d %d deleted\n",blk,c));
4616                         }
4617                         else if(!tags.chunkUsed)
4618                         {
4619                                 // An unassigned chunk in the block
4620                                 // This means that either the block is empty or
4621                                 // this is the one being allocated from
4622
4623                                 if(c == 0)
4624                                 {
4625                                         // We're looking at the first chunk in the block so the block is unused
4626                                         state = YAFFS_BLOCK_STATE_EMPTY;
4627                                         dev->nErasedBlocks++;
4628                                 }
4629                                 else
4630                                 {
4631                                         // this is the block being allocated from
4632                                         T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
4633                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
4634                                         dev->allocationBlock = blk;
4635                                         dev->allocationPage = c;
4636                                         dev->allocationBlockFinder = blk; // Set it to here to encourage the allocator to
4637                                                                                                           // go forth from here.
4638                                         //Yaffs2 sanity check:
4639                                         // This should be the one with the highest sequence number
4640                                         if(dev->isYaffs2 && (dev->sequenceNumber != bi->sequenceNumber))
4641                                         {
4642                                                 T(YAFFS_TRACE_ALWAYS,
4643                                                                 (TSTR("yaffs: Allocation block %d was not highest sequence id: block seq = %d, dev seq = %d" TENDSTR),
4644                                                                 blk,bi->sequenceNumber,dev->sequenceNumber));
4645                                         }
4646                                 }
4647
4648                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4649                         }
4650                         else if(tags.chunkId > 0)
4651                         {
4652                                 // chunkId > 0 so it is a data chunk...
4653                                 unsigned int endpos;
4654
4655                                 yaffs_SetChunkBit(dev,blk,c);
4656                                 bi->pagesInUse++;
4657
4658                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
4659                                 // PutChunkIntoFile checks for a clash (two data chunks with
4660                                 // the same chunkId).
4661                                 yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
4662                                 endpos = (tags.chunkId - 1)* dev->nBytesPerChunk + tags.byteCount;
4663                                 if(in->variantType == YAFFS_OBJECT_TYPE_FILE && in->variant.fileVariant.scannedFileSize <endpos)
4664                                 {
4665                                         in->variant.fileVariant.scannedFileSize = endpos;
4666                                         if(!dev->useHeaderFileSize)
4667                                         {
4668                                                         in->variant.fileVariant.fileSize = in->variant.fileVariant.scannedFileSize;
4669                                         }
4670
4671                                 }
4672                                 //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
4673                         }
4674                         else
4675                         {
4676                                 // chunkId == 0, so it is an ObjectHeader.
4677                                 // Thus, we read in the object header and make the object
4678                                 yaffs_SetChunkBit(dev,blk,c);
4679                                 bi->pagesInUse++;
4680
4681                                 yaffs_ReadChunkWithTagsFromNAND(dev,chunk,chunkData,NULL);
4682
4683                                 oh = (yaffs_ObjectHeader *)chunkData;
4684
4685                                 in = yaffs_FindObjectByNumber(dev,tags.objectId);
4686                                 if(in && in->variantType != oh->type)
4687                                 {
4688                                         // This should not happen, but somehow
4689                                         // Wev'e ended up with an objectId that has been reused but not yet
4690                                         // deleted, and worse still it has changed type. Delete the old object.
4691
4692                                         yaffs_DestroyObject(in);
4693
4694                                         in = 0;
4695                                 }
4696
4697                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
4698
4699                                 if(in->valid)
4700                                 {
4701                                         // We have already filled this one. We have a duplicate and need to resolve it.
4702
4703                                         unsigned existingSerial = in->serial;
4704                                         unsigned newSerial = tags.serialNumber;
4705
4706                                         if( dev->isYaffs2 ||
4707                                             ((existingSerial+1) & 3) == newSerial)
4708                                         {
4709                                                 // Use new one - destroy the exisiting one
4710                                                 yaffs_DeleteChunk(dev,in->chunkId,1,__LINE__);
4711                                                 in->valid = 0;
4712                                         }
4713                                         else
4714                                         {
4715                                                 // Use existing - destroy this one.
4716                                                 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
4717                                         }
4718                                 }
4719
4720                                 if(!in->valid &&
4721                                    (tags.objectId == YAFFS_OBJECTID_ROOT ||
4722                                     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
4723                                 {
4724                                         // We only load some info, don't fiddle with directory structure
4725                                         in->valid = 1;
4726                                         in->variantType = oh->type;
4727
4728                                         in->yst_mode  = oh->yst_mode;
4729 #ifdef CONFIG_YAFFS_WINCE
4730                                         in->win_atime[0] = oh->win_atime[0];
4731                                         in->win_ctime[0] = oh->win_ctime[0];
4732                                         in->win_mtime[0] = oh->win_mtime[0];
4733                                         in->win_atime[1] = oh->win_atime[1];
4734                                         in->win_ctime[1] = oh->win_ctime[1];
4735                                         in->win_mtime[1] = oh->win_mtime[1];
4736 #else
4737                                         in->yst_uid   = oh->yst_uid;
4738                                         in->yst_gid   = oh->yst_gid;
4739                                         in->yst_atime = oh->yst_atime;
4740                                         in->yst_mtime = oh->yst_mtime;
4741                                         in->yst_ctime = oh->yst_ctime;
4742                                         in->yst_rdev = oh->yst_rdev;
4743 #endif
4744                                         in->chunkId  = chunk;
4745
4746                                 }
4747                                 else if(!in->valid)
4748                                 {
4749                                         // we need to load this info
4750
4751                                         in->valid = 1;
4752                                         in->variantType = oh->type;
4753
4754                                         in->yst_mode  = oh->yst_mode;
4755 #ifdef CONFIG_YAFFS_WINCE
4756                                         in->win_atime[0] = oh->win_atime[0];
4757                                         in->win_ctime[0] = oh->win_ctime[0];
4758                                         in->win_mtime[0] = oh->win_mtime[0];
4759                                         in->win_atime[1] = oh->win_atime[1];
4760                                         in->win_ctime[1] = oh->win_ctime[1];
4761                                         in->win_mtime[1] = oh->win_mtime[1];
4762 #else
4763                                         in->yst_uid   = oh->yst_uid;
4764                                         in->yst_gid   = oh->yst_gid;
4765                                         in->yst_atime = oh->yst_atime;
4766                                         in->yst_mtime = oh->yst_mtime;
4767                                         in->yst_ctime = oh->yst_ctime;
4768                                         in->yst_rdev = oh->yst_rdev;
4769 #endif
4770                                         in->chunkId  = chunk;
4771
4772                                         yaffs_SetObjectName(in,oh->name);
4773                                         in->dirty = 0;
4774
4775                                         // directory stuff...
4776                                         // hook up to parent
4777
4778                                         parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
4779                                         if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
4780                                         {
4781                                                 // Set up as a directory
4782                                                 parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
4783                                                 INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
4784                                         }
4785                                         else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
4786                                         {
4787                                                 // Hoosterman, another problem....
4788                                                 // We're trying to use a non-directory as a directory
4789
4790                                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR)));
4791                                                 parent = dev->lostNFoundDir;
4792                                         }
4793
4794                                         yaffs_AddObjectToDirectory(parent,in);
4795
4796                                         if(0 && (parent == dev->deletedDir ||
4797                                            parent == dev->unlinkedDir))
4798                                         {
4799                                                 in->deleted = 1; // If it is unlinked at start up then it wants deleting
4800                                                 dev->nDeletedFiles++;
4801                                         }
4802
4803                                         // Note re hardlinks.
4804                                         // Since we might scan a hardlink before its equivalent object is scanned
4805                                         // we put them all in a list.
4806                                         // After scanning is complete, we should have all the objects, so we run through this
4807                                         // list and fix up all the chains.
4808
4809                                         switch(in->variantType)
4810                                         {
4811                                                 case YAFFS_OBJECT_TYPE_UNKNOWN:         // Todo got a problem
4812                                                         break;
4813                                                 case YAFFS_OBJECT_TYPE_FILE:
4814                                                         if(dev->isYaffs2 && oh->isShrink)
4815                                                         {
4816                                                                 // Prune back the shrunken chunks
4817                                                                 yaffs_PruneResizedChunks(in,oh->fileSize);
4818                                                                 // Mark the block as having a shrinkHeader
4819                                                                 bi->hasShrinkHeader = 1;
4820                                                         }
4821
4822                                                         if(dev->useHeaderFileSize)
4823
4824                                                                 in->variant.fileVariant.fileSize = oh->fileSize;
4825
4826                                                         break;
4827                                                 case YAFFS_OBJECT_TYPE_HARDLINK:
4828                                                         in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
4829                                                         in->hardLinks.next = (struct list_head *)hardList;
4830                                                         hardList = in;
4831                                                         break;
4832                                                 case YAFFS_OBJECT_TYPE_DIRECTORY:       // Do nothing
4833                                                         break;
4834                                                 case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
4835                                                         break;
4836                                                 case YAFFS_OBJECT_TYPE_SYMLINK:         // Do nothing
4837                                                         in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
4838                                                         break;
4839                                         }
4840
4841                                         if(parent == dev->deletedDir)
4842                                         {
4843                                                 yaffs_DestroyObject(in);
4844                                                 bi->hasShrinkHeader = 1;
4845                                         }
4846                                         //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
4847                                 }
4848                         }
4849                 }
4850
4851                 if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
4852                 {
4853                         // If we got this far while scanning, then the block is fully allocated.
4854                         state = YAFFS_BLOCK_STATE_FULL;
4855                 }
4856
4857                 bi->blockState = state;
4858
4859                 // Now let's see if it was dirty
4860                 if(     bi->pagesInUse == 0 &&
4861                         !bi->hasShrinkHeader &&
4862                 bi->blockState == YAFFS_BLOCK_STATE_FULL)
4863             {
4864                 yaffs_BlockBecameDirty(dev,blk);
4865             }
4866
4867         }
4868
4869         if(blockIndex)
4870         {
4871                 YFREE(blockIndex);
4872         }
4873
4874         // Ok, we've done all the scanning.
4875
4876         // Fix up the hard link chains.
4877         // We should now have scanned all the objects, now it's time to add these
4878         // hardlinks.
4879         while(hardList)
4880         {
4881                 hl = hardList;
4882                 hardList = (yaffs_Object *)(hardList->hardLinks.next);
4883
4884                 in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
4885
4886                 if(in)
4887                 {
4888                         // Add the hardlink pointers
4889                         hl->variant.hardLinkVariant.equivalentObject=in;
4890                         list_add(&hl->hardLinks,&in->hardLinks);
4891                 }
4892                 else
4893                 {
4894                         //Todo Need to report/handle this better.
4895                         // Got a problem... hardlink to a non-existant object
4896                         hl->variant.hardLinkVariant.equivalentObject=NULL;
4897                         INIT_LIST_HEAD(&hl->hardLinks);
4898
4899                 }
4900
4901         }
4902
4903         {
4904                 struct list_head *i;
4905                 struct list_head *n;
4906
4907                 yaffs_Object *l;
4908                 // Soft delete all the unlinked files
4909                 list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
4910                 {
4911                         if(i)
4912                         {
4913                                 l = list_entry(i, yaffs_Object,siblings);
4914                                 yaffs_DestroyObject(l);
4915                         }
4916                 }
4917         }
4918
4919         yaffs_ReleaseTempBuffer(dev,chunkData,__LINE__);
4920
4921         T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan ends" TENDSTR)));
4922
4923         return YAFFS_OK;
4924 }
4925
4926
4927 static int yaffs_ScanBackwards(yaffs_Device *dev)
4928 {
4929         yaffs_ExtendedTags tags;
4930         int blk;
4931         int blockIterator;
4932         int startIterator;
4933         int endIterator;
4934         int nBlocksToScan = 0;
4935
4936         int chunk;
4937         int c;
4938         int deleted;
4939         yaffs_BlockState state;
4940         yaffs_Object *hardList = NULL;
4941         yaffs_Object *hl;
4942         yaffs_BlockInfo *bi;
4943         int sequenceNumber;
4944         yaffs_ObjectHeader *oh;
4945         yaffs_Object *in;
4946         yaffs_Object *parent;
4947         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4948
4949         __u8 *chunkData;
4950
4951         yaffs_BlockIndex *blockIndex = NULL;
4952
4953
4954         if(!dev->isYaffs2)
4955         {
4956                 T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
4957                 return YAFFS_FAIL;
4958         }
4959
4960         T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..." TENDSTR),dev->internalStartBlock,dev->internalEndBlock));
4961
4962         chunkData = yaffs_GetTempBuffer(dev,__LINE__);
4963
4964
4965         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4966
4967         if(dev->isYaffs2)
4968         {
4969                 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4970         }
4971
4972
4973         // Scan all the blocks to determine their state
4974         for(blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++)
4975         {
4976                 bi = yaffs_GetBlockInfo(dev,blk);
4977                 yaffs_ClearChunkBits(dev,blk);
4978                 bi->pagesInUse = 0;
4979                 bi->softDeletions = 0;
4980
4981                 yaffs_QueryInitialBlockState(dev,blk,&state,&sequenceNumber);
4982
4983                 bi->blockState = state;
4984                 bi->sequenceNumber = sequenceNumber;
4985
4986                 T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block scanning block %d state %d seq %d" TENDSTR),blk,state,sequenceNumber));
4987
4988                 if(state == YAFFS_BLOCK_STATE_DEAD)
4989                 {
4990                         T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
4991                 }
4992                 else if(state == YAFFS_BLOCK_STATE_EMPTY)
4993                 {
4994                         T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block empty " TENDSTR)));
4995                         dev->nErasedBlocks++;
4996                         dev->nFreeChunks += dev->nChunksPerBlock;
4997                 }
4998                 else if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
4999                 {
5000
5001                         // Determine the highest sequence number
5002                         if( dev->isYaffs2 &&
5003                             sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
5004                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER)
5005                          {
5006
5007                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
5008                                 blockIndex[nBlocksToScan].block = blk;
5009
5010                                 nBlocksToScan++;
5011
5012                                 if(sequenceNumber >= dev->sequenceNumber)
5013                                 {
5014                                         dev->sequenceNumber = sequenceNumber;
5015                                 }
5016                         }
5017                         else if(dev->isYaffs2)
5018                         {
5019                                 // TODO: Nasty sequence number!
5020                                 T(YAFFS_TRACE_SCAN,(TSTR("Block scanning block %d has bad sequence number %d" TENDSTR),blk,sequenceNumber));
5021
5022                         }
5023                 }
5024         }
5025
5026         // Sort the blocks
5027         // Dungy old bubble sort for now...
5028         if(dev->isYaffs2)
5029         {
5030                 yaffs_BlockIndex temp;
5031                 int i;
5032                 int j;
5033
5034                 for(i = 0; i < nBlocksToScan; i++)
5035                         for(j = i+1; j < nBlocksToScan; j++)
5036                          if(blockIndex[i].seq > blockIndex[j].seq)
5037                          {
5038                                 temp = blockIndex[j];
5039                                 blockIndex[j] = blockIndex[i];
5040                                 blockIndex[i] = temp;
5041                          }
5042         }
5043
5044
5045         // Now scan the blocks looking at the data.
5046         if(dev->isYaffs2)
5047         {
5048                 startIterator = 0;
5049                 endIterator = nBlocksToScan-1;
5050                 T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("%d blocks to be scanned" TENDSTR),nBlocksToScan));
5051         }
5052
5053
5054         // For each block.... backwards
5055         for(blockIterator = endIterator; blockIterator >= startIterator; blockIterator--)
5056         {
5057
5058                 // get the block to scan in the correct order
5059                 blk = blockIndex[blockIterator].block;
5060
5061
5062                 bi = yaffs_GetBlockInfo(dev,blk);
5063                 state = bi->blockState;
5064
5065                 deleted = 0;
5066
5067                 if( 0 && // Disable since this is redundant.
5068                     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
5069                 {
5070                         // Let's look at the first chunk in the block
5071                         chunk = blk * dev->nChunksPerBlock;
5072
5073                         yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
5074
5075                         // Let's have a good look at this chunk...
5076
5077                         if(!tags.chunkUsed)
5078                         {
5079                                 // An unassigned chunk in the block
5080                                 // This means that either the block is empty or
5081                                 // this is the one being allocated from
5082
5083                                 // We're looking at the first chunk in the block so the block is unused
5084                                 state = YAFFS_BLOCK_STATE_EMPTY;
5085                                 dev->nErasedBlocks++;
5086                                 dev->nFreeChunks += dev->nChunksPerBlock;
5087                         }
5088
5089                 }
5090
5091                 // For each chunk in each block that needs scanning....
5092                 for(c = dev->nChunksPerBlock-1; c >= 0 &&
5093                                   (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
5094                                    state == YAFFS_BLOCK_STATE_ALLOCATING); c--)
5095                 {
5096                         // Scan backwards...
5097                         // Read the tags and decide what to do
5098                         chunk = blk * dev->nChunksPerBlock + c;
5099
5100                         yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
5101
5102                         // Let's have a good look at this chunk...
5103
5104                         if(!tags.chunkUsed)
5105                         {
5106                                 // An unassigned chunk in the block
5107                                 // This means that either the block is empty or
5108                                 // this is the one being allocated from
5109
5110                                 if(c == 0)
5111                                 {
5112                                         // We're looking at the first chunk in the block so the block is unused
5113                                         state = YAFFS_BLOCK_STATE_EMPTY;
5114                                         dev->nErasedBlocks++;
5115                                 }
5116                                 else
5117                                 {
5118                                         // this is the block being allocated from
5119                                         if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
5120                                         {
5121                                           T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
5122                                         }
5123                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5124                                         dev->allocationBlock = blk;
5125                                         dev->allocationPage = c;
5126                                         dev->allocationBlockFinder = blk; // Set it to here to encourage the allocator to
5127                                                                                                           // go forth from here.
5128                                         //Yaffs2 sanity check:
5129                                         // This should be the one with the highest sequence number
5130                                         if(dev->isYaffs2 && (dev->sequenceNumber != bi->sequenceNumber))
5131                                         {
5132                                                 T(YAFFS_TRACE_ALWAYS,
5133                                                                 (TSTR("yaffs: Allocation block %d was not highest sequence id: block seq = %d, dev seq = %d" TENDSTR),
5134                                                                 blk,bi->sequenceNumber,dev->sequenceNumber));
5135                                         }
5136                                 }
5137
5138                                 dev->nFreeChunks ++;
5139                         }
5140                         else if(tags.chunkId > 0)
5141                         {
5142                                 // chunkId > 0 so it is a data chunk...
5143                                 unsigned int endpos;
5144
5145                                 __u32 chunkBase = (tags.chunkId - 1)* dev->nBytesPerChunk;
5146
5147                                 yaffs_SetChunkBit(dev,blk,c);
5148                                 bi->pagesInUse++;
5149
5150                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
5151                                 if(in->variantType == YAFFS_OBJECT_TYPE_FILE &&
5152                                    chunkBase < in->variant.fileVariant.shrinkSize)
5153                                 {
5154                                         // This has not been invalidated by a resize
5155                                         yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,-1);
5156
5157
5158                                         // File size is calculated by looking at the data chunks if we have not
5159                                         // seen an object header yet. Stop this practice once we find an object header.
5160                                         endpos = (tags.chunkId - 1)* dev->nBytesPerChunk + tags.byteCount;
5161                                         if(!in->valid && // have not got an object header yet
5162                                            in->variant.fileVariant.scannedFileSize <endpos)
5163                                         {
5164                                                 in->variant.fileVariant.scannedFileSize = endpos;
5165                                                 in->variant.fileVariant.fileSize = in->variant.fileVariant.scannedFileSize;
5166                                         }
5167
5168                                 }
5169                                 else
5170                                 {
5171                                         // This chunk has been invalidated by a resize, so delete
5172                                         yaffs_DeleteChunk(dev,chunk,1,__LINE__);
5173
5174
5175                                 }
5176                                 //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
5177                         }
5178                         else
5179                         {
5180                                 // chunkId == 0, so it is an ObjectHeader.
5181                                 // Thus, we read in the object header and make the object
5182                                 yaffs_SetChunkBit(dev,blk,c);
5183                                 bi->pagesInUse++;
5184
5185                                 oh = NULL;
5186                                 in = NULL;
5187
5188                                 if(tags.extraHeaderInfoAvailable)
5189                                 {
5190                                         in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,tags.extraObjectType);
5191                                 }
5192
5193
5194                                 if(!in || !in->valid)
5195                                 {
5196
5197                                         // If we don't have  valid info then we need to read the chunk
5198                                         // TODO In future we can probably defer reading the chunk and
5199                                         // living with invalid data until needed.
5200
5201                                         yaffs_ReadChunkWithTagsFromNAND(dev,chunk,chunkData,NULL);
5202
5203                                         oh = (yaffs_ObjectHeader *)chunkData;
5204
5205                                         if(!in)
5206                                            in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
5207
5208                                 }
5209
5210                                 if(!in)
5211                                 {
5212                                         // TODO Hoosterman we have a problem!
5213                                         T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: Could not make object for object  %d  at chunk %d during scan" TENDSTR),tags.objectId,chunk));
5214
5215                                 }
5216
5217                                 if(in->valid)
5218                                 {
5219                                         // We have already filled this one. We have a duplicate that will be discarded, but
5220                                         // we first have to suck out resize info if it is a file.
5221
5222                                         if( (in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
5223                                             ((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
5224                                             (tags.extraHeaderInfoAvailable && tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
5225                                            )
5226                                         {
5227                                                 __u32 thisSize = (oh) ? oh->fileSize : tags.extraFileLength;
5228                                                 __u32 parentObjectId = (oh) ? oh->parentObjectId : tags.extraParentObjectId;
5229                                                 unsigned isShrink = (oh)  ? oh->isShrink : tags.extraIsShrinkHeader;
5230
5231                                                 // If it is deleted (unlinked at start also means deleted)
5232                                                 // we treat the file size as being zeroed at this point.
5233                                                 if(parentObjectId == YAFFS_OBJECTID_DELETED ||
5234                                                    parentObjectId == YAFFS_OBJECTID_UNLINKED)
5235                                                 {
5236                                                         thisSize = 0;
5237                                                         isShrink = 1;
5238                                                 }
5239
5240                                                 if(in->variant.fileVariant.shrinkSize > thisSize)
5241                                                 {
5242                                                         in->variant.fileVariant.shrinkSize = thisSize;
5243                                                 }
5244
5245                                                 if(isShrink)
5246                                                 {
5247                                                         bi->hasShrinkHeader = 1;
5248                                                 }
5249
5250                                         }
5251                                         // Use existing - destroy this one.
5252                                         yaffs_DeleteChunk(dev,chunk,1,__LINE__);
5253
5254                                 }
5255
5256                                 if(!in->valid &&
5257                                    (tags.objectId == YAFFS_OBJECTID_ROOT ||
5258                                     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
5259                                 {
5260                                         // We only load some info, don't fiddle with directory structure
5261                                         in->valid = 1;
5262                                         in->variantType = oh->type;
5263
5264                                         in->yst_mode  = oh->yst_mode;
5265 #ifdef CONFIG_YAFFS_WINCE
5266                                         in->win_atime[0] = oh->win_atime[0];
5267                                         in->win_ctime[0] = oh->win_ctime[0];
5268                                         in->win_mtime[0] = oh->win_mtime[0];
5269                                         in->win_atime[1] = oh->win_atime[1];
5270                                         in->win_ctime[1] = oh->win_ctime[1];
5271                                         in->win_mtime[1] = oh->win_mtime[1];
5272 #else
5273                                         in->yst_uid   = oh->yst_uid;
5274                                         in->yst_gid   = oh->yst_gid;
5275                                         in->yst_atime = oh->yst_atime;
5276                                         in->yst_mtime = oh->yst_mtime;
5277                                         in->yst_ctime = oh->yst_ctime;
5278                                         in->yst_rdev = oh->yst_rdev;
5279 #endif
5280                                         in->chunkId  = chunk;
5281
5282                                 }
5283                                 else if(!in->valid)
5284                                 {
5285                                         // we need to load this info
5286
5287                                         in->valid = 1;
5288                                         in->variantType = oh->type;
5289
5290                                         in->yst_mode  = oh->yst_mode;
5291 #ifdef CONFIG_YAFFS_WINCE
5292                                         in->win_atime[0] = oh->win_atime[0];
5293                                         in->win_ctime[0] = oh->win_ctime[0];
5294                                         in->win_mtime[0] = oh->win_mtime[0];
5295                                         in->win_atime[1] = oh->win_atime[1];
5296                                         in->win_ctime[1] = oh->win_ctime[1];
5297                                         in->win_mtime[1] = oh->win_mtime[1];
5298 #else
5299                                         in->yst_uid   = oh->yst_uid;
5300                                         in->yst_gid   = oh->yst_gid;
5301                                         in->yst_atime = oh->yst_atime;
5302                                         in->yst_mtime = oh->yst_mtime;
5303                                         in->yst_ctime = oh->yst_ctime;
5304                                         in->yst_rdev = oh->yst_rdev;
5305 #endif
5306                                         in->chunkId  = chunk;
5307
5308                                         yaffs_SetObjectName(in,oh->name);
5309                                         in->dirty = 0;
5310
5311                                         // directory stuff...
5312                                         // hook up to parent
5313
5314                                         parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
5315                                         if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
5316                                         {
5317                                                 // Set up as a directory
5318                                                 parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
5319                                                 INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
5320                                         }
5321                                         else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5322                                         {
5323                                                 // Hoosterman, another problem....
5324                                                 // We're trying to use a non-directory as a directory
5325
5326                                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR)));
5327                                                 parent = dev->lostNFoundDir;
5328                                         }
5329
5330                                         yaffs_AddObjectToDirectory(parent,in);
5331
5332                                         if((parent == dev->deletedDir ||
5333                                            parent == dev->unlinkedDir))
5334                                         {
5335                                                 in->deleted = 1; // If it is unlinked at start up then it wants deleting
5336                                         }
5337
5338                                         if( oh->isShrink)
5339                                         {
5340                                                 // Mark the block as having a shrinkHeader
5341                                                 bi->hasShrinkHeader = 1;
5342                                         }
5343
5344
5345                                         // Note re hardlinks.
5346                                         // Since we might scan a hardlink before its equivalent object is scanned
5347                                         // we put them all in a list.
5348                                         // After scanning is complete, we should have all the objects, so we run through this
5349                                         // list and fix up all the chains.
5350
5351                                         switch(in->variantType)
5352                                         {
5353                                                 case YAFFS_OBJECT_TYPE_UNKNOWN:         // Todo got a problem
5354                                                         break;
5355                                                 case YAFFS_OBJECT_TYPE_FILE:
5356
5357
5358                                                         if(in->variant.fileVariant.scannedFileSize < oh->fileSize)
5359                                                         {
5360                                                                 in->variant.fileVariant.fileSize = oh->fileSize;
5361                                                                 in->variant.fileVariant.scannedFileSize = in->variant.fileVariant.fileSize;
5362                                                         }
5363
5364
5365
5366                                                         if(in->variant.fileVariant.shrinkSize > oh->fileSize)
5367                                                         {
5368                                                                 in->variant.fileVariant.shrinkSize = oh->fileSize;
5369                                                         }
5370
5371
5372                                                         break;
5373                                                 case YAFFS_OBJECT_TYPE_HARDLINK:
5374                                                         in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
5375                                                         in->hardLinks.next = (struct list_head *)hardList;
5376                                                         hardList = in;
5377                                                         break;
5378                                                 case YAFFS_OBJECT_TYPE_DIRECTORY:       // Do nothing
5379                                                         break;
5380                                                 case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
5381                                                         break;
5382                                                 case YAFFS_OBJECT_TYPE_SYMLINK:         // Do nothing
5383                                                         in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
5384                                                         break;
5385                                         }
5386
5387 #if 0
5388                                         if(parent == dev->deletedDir)
5389                                         {
5390                                                 yaffs_DestroyObject(in);
5391                                                 bi->hasShrinkHeader = 1;
5392                                         }
5393 #endif
5394                                         //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
5395                                 }
5396                         }
5397                 }
5398
5399                 if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
5400                 {
5401                         // If we got this far while scanning, then the block is fully allocated.
5402                         state = YAFFS_BLOCK_STATE_FULL;
5403                 }
5404
5405                 bi->blockState = state;
5406
5407                 // Now let's see if it was dirty
5408                 if(     bi->pagesInUse == 0 &&
5409                         !bi->hasShrinkHeader &&
5410                 bi->blockState == YAFFS_BLOCK_STATE_FULL)
5411             {
5412                 yaffs_BlockBecameDirty(dev,blk);
5413             }
5414
5415         }
5416
5417         if(blockIndex)
5418         {
5419                 YFREE(blockIndex);
5420         }
5421
5422         // Ok, we've done all the scanning.
5423
5424         // Fix up the hard link chains.
5425         // We should now have scanned all the objects, now it's time to add these
5426         // hardlinks.
5427         while(hardList)
5428         {
5429                 hl = hardList;
5430                 hardList = (yaffs_Object *)(hardList->hardLinks.next);
5431
5432                 in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
5433
5434                 if(in)
5435                 {
5436                         // Add the hardlink pointers
5437                         hl->variant.hardLinkVariant.equivalentObject=in;
5438                         list_add(&hl->hardLinks,&in->hardLinks);
5439                 }
5440                 else
5441                 {
5442                         //Todo Need to report/handle this better.
5443                         // Got a problem... hardlink to a non-existant object
5444                         hl->variant.hardLinkVariant.equivalentObject=NULL;
5445                         INIT_LIST_HEAD(&hl->hardLinks);
5446
5447                 }
5448
5449         }
5450
5451         {
5452                 struct list_head *i;
5453                 struct list_head *n;
5454
5455                 yaffs_Object *l;
5456
5457                 // Soft delete all the unlinked files
5458                 list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
5459                 {
5460                         if(i)
5461                         {
5462                                 l = list_entry(i, yaffs_Object,siblings);
5463                                 yaffs_DestroyObject(l);
5464                         }
5465                 }
5466
5467                 // Soft delete all the deletedDir files
5468                 list_for_each_safe(i,n,&dev->deletedDir->variant.directoryVariant.children)
5469                 {
5470                         if(i)
5471                         {
5472                                 l = list_entry(i, yaffs_Object,siblings);
5473                                 yaffs_DestroyObject(l);
5474
5475                         }
5476                 }
5477         }
5478
5479         yaffs_ReleaseTempBuffer(dev,chunkData,__LINE__);
5480
5481         T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards ends" TENDSTR)));
5482
5483         return YAFFS_OK;
5484 }
5485
5486
5487
5488 ////////////////////////// Directory Functions /////////////////////////
5489
5490
5491 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
5492 {
5493
5494         if(!directory)
5495         {
5496                 T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: Trying to add an object to a null pointer directory" TENDSTR)));
5497                 YBUG();
5498         }
5499         if(directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5500         {
5501                 T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: Trying to add an object to a non-directory" TENDSTR)));
5502                 YBUG();
5503         }
5504
5505                 if(obj->siblings.prev == NULL)
5506         {
5507                 // Not initialised
5508                 INIT_LIST_HEAD(&obj->siblings);
5509
5510         }
5511         else if(!list_empty(&obj->siblings))
5512         {
5513                 // If it is holed up somewhere else, un hook it
5514                 list_del_init(&obj->siblings);
5515         }
5516         // Now add it
5517         list_add(&obj->siblings,&directory->variant.directoryVariant.children);
5518         obj->parent = directory;
5519
5520         if(directory == obj->myDev->unlinkedDir || directory == obj->myDev->deletedDir)
5521         {
5522                 obj->unlinked = 1;
5523                 obj->myDev->nUnlinkedFiles++;
5524                 obj->renameAllowed = 0;
5525         }
5526 }
5527
5528 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
5529 {
5530         list_del_init(&obj->siblings);
5531         obj->parent = NULL;
5532 }
5533
5534 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const YCHAR *name)
5535 {
5536         int sum;
5537
5538         struct list_head *i;
5539         YCHAR buffer[YAFFS_MAX_NAME_LENGTH+1];
5540
5541         yaffs_Object *l;
5542
5543
5544         if(!directory)
5545         {
5546                 T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: null pointer directory"TENDSTR)));
5547                 YBUG();
5548         }
5549         if(directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5550         {
5551                 T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: non-directory"TENDSTR)));
5552                 YBUG();
5553         }
5554
5555         sum = yaffs_CalcNameSum(name);
5556
5557         list_for_each(i,&directory->variant.directoryVariant.children)
5558         {
5559                 if(i)
5560                 {
5561                         l = list_entry(i, yaffs_Object,siblings);
5562
5563                         // Special case for lost-n-found
5564                         if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
5565                         {
5566                                 if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
5567                                 {
5568                                         return l;
5569                                 }
5570                         }
5571                         else if(yaffs_SumCompare(l->sum, sum)||
5572                                     l->chunkId <= 0) //LostnFound cunk called Objxxx
5573                         {
5574                                 // Do a real check
5575                                 yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
5576                                 if(yaffs_strcmp(name,buffer) == 0)
5577                                 {
5578                                         return l;
5579                                 }
5580
5581                         }
5582                 }
5583         }
5584
5585         return NULL;
5586 }
5587
5588
5589 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
5590 {
5591         struct list_head *i;
5592         yaffs_Object *l;
5593
5594
5595         if(!theDir)
5596         {
5597                 T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: null pointer directory"TENDSTR)));
5598                 YBUG();
5599         }
5600         if(theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5601         {
5602                 T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: non-directory"TENDSTR)));
5603                 YBUG();
5604         }
5605
5606         list_for_each(i,&theDir->variant.directoryVariant.children)
5607         {
5608                 if(i)
5609                 {
5610                         l = list_entry(i, yaffs_Object,siblings);
5611                         if(l && !fn(l))
5612                         {
5613                                 return YAFFS_FAIL;
5614                         }
5615                 }
5616         }
5617
5618         return YAFFS_OK;
5619
5620 }
5621
5622
5623 // GetEquivalentObject dereferences any hard links to get to the
5624 // actual object.
5625
5626 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
5627 {
5628         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
5629         {
5630                 // We want the object id of the equivalent object, not this one
5631                 obj = obj->variant.hardLinkVariant.equivalentObject;
5632         }
5633         return obj;
5634
5635 }
5636
5637 int yaffs_GetObjectName(yaffs_Object *obj,YCHAR *name,int buffSize)
5638 {
5639         memset(name,0,buffSize * sizeof(YCHAR));
5640
5641         if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)
5642         {
5643                 yaffs_strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);
5644         }
5645         else if(obj->chunkId <= 0)
5646         {
5647                 YCHAR locName[20];
5648                 // make up a name
5649                 yaffs_sprintf(locName,_Y("%s%d"),YAFFS_LOSTNFOUND_PREFIX,obj->objectId);
5650                 yaffs_strncpy(name,locName,buffSize - 1);
5651
5652         }
5653 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
5654         else if(obj->shortName[0])
5655         {
5656                 yaffs_strcpy(name,obj->shortName);
5657         }
5658 #endif
5659         else
5660         {
5661                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev,__LINE__);
5662
5663                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
5664
5665                 memset(buffer,0,obj->myDev->nBytesPerChunk);
5666
5667                 if(obj->chunkId >= 0)
5668                 {
5669                         yaffs_ReadChunkWithTagsFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
5670                 }
5671                 yaffs_strncpy(name,oh->name,buffSize - 1);
5672
5673                 yaffs_ReleaseTempBuffer(obj->myDev,buffer,__LINE__);
5674         }
5675
5676         return yaffs_strlen(name);
5677 }
5678
5679 int yaffs_GetObjectFileLength(yaffs_Object *obj)
5680 {
5681
5682         // Dereference any hard linking
5683         obj = yaffs_GetEquivalentObject(obj);
5684
5685         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
5686         {
5687                 return obj->variant.fileVariant.fileSize;
5688         }
5689         if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
5690         {
5691                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5692         }
5693         else
5694         {
5695                 // Only a directory should drop through to here
5696                 return obj->myDev->nBytesPerChunk;
5697         }
5698 }
5699
5700 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
5701 {
5702         int count = 0;
5703         struct list_head *i;
5704
5705         if(!obj->unlinked)
5706         {
5707                 count++;        // the object itself
5708         }
5709         list_for_each(i,&obj->hardLinks)
5710         {
5711                 count++;        // add the hard links;
5712         }
5713         return count;
5714
5715 }
5716
5717
5718 int yaffs_GetObjectInode(yaffs_Object *obj)
5719 {
5720         obj = yaffs_GetEquivalentObject(obj);
5721
5722         return obj->objectId;
5723 }
5724
5725 unsigned yaffs_GetObjectType(yaffs_Object *obj)
5726 {
5727         obj = yaffs_GetEquivalentObject(obj);
5728
5729         switch(obj->variantType)
5730         {
5731                 case YAFFS_OBJECT_TYPE_FILE:            return DT_REG; break;
5732                 case YAFFS_OBJECT_TYPE_DIRECTORY:       return DT_DIR; break;
5733                 case YAFFS_OBJECT_TYPE_SYMLINK:         return DT_LNK; break;
5734                 case YAFFS_OBJECT_TYPE_HARDLINK:        return DT_REG; break;
5735                 case YAFFS_OBJECT_TYPE_SPECIAL:
5736                         if(S_ISFIFO(obj->yst_mode)) return DT_FIFO;
5737                         if(S_ISCHR(obj->yst_mode)) return DT_CHR;
5738                         if(S_ISBLK(obj->yst_mode)) return DT_BLK;
5739                         if(S_ISSOCK(obj->yst_mode)) return DT_SOCK;
5740                 default: return DT_REG; break;
5741         }
5742 }
5743
5744 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
5745 {
5746         obj = yaffs_GetEquivalentObject(obj);
5747         if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
5748         {
5749                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
5750         }
5751         else
5752         {
5753                 return yaffs_CloneString(_Y(""));
5754         }
5755 }
5756
5757 #ifndef CONFIG_YAFFS_WINCE
5758
5759 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
5760 {
5761         unsigned int valid = attr->ia_valid;
5762
5763         if(valid & ATTR_MODE) obj->yst_mode = attr->ia_mode;
5764         if(valid & ATTR_UID) obj->yst_uid = attr->ia_uid;
5765         if(valid & ATTR_GID) obj->yst_gid = attr->ia_gid;
5766
5767         if(valid & ATTR_ATIME) obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
5768         if(valid & ATTR_CTIME) obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
5769         if(valid & ATTR_MTIME) obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
5770
5771         if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
5772
5773         yaffs_UpdateObjectHeader(obj,NULL,1,0);
5774
5775         return YAFFS_OK;
5776
5777 }
5778 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
5779 {
5780         unsigned int valid = 0;
5781
5782         attr->ia_mode = obj->yst_mode;  valid |= ATTR_MODE;
5783         attr->ia_uid = obj->yst_uid;            valid |= ATTR_UID;
5784         attr->ia_gid = obj->yst_gid;            valid |= ATTR_GID;
5785
5786         Y_TIME_CONVERT(attr->ia_atime)= obj->yst_atime; valid |= ATTR_ATIME;
5787         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;        valid |= ATTR_CTIME;
5788         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;        valid |= ATTR_MTIME;
5789
5790         attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
5791
5792         attr->ia_valid = valid;
5793
5794         return YAFFS_OK;
5795
5796 }
5797
5798 #endif
5799
5800 int yaffs_DumpObject(yaffs_Object *obj)
5801 {
5802 //      __u8 buffer[YAFFS_BYTES_PER_CHUNK];
5803         YCHAR name[257];
5804 //      yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
5805
5806 //      memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
5807
5808 //      if(obj->chunkId >= 0)
5809 //      {
5810 //              yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
5811 //      }
5812
5813         yaffs_GetObjectName(obj,name,256);
5814
5815         T(YAFFS_TRACE_ALWAYS,(TSTR("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n" TENDSTR),
5816                         obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial,
5817                         obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
5818
5819 #if 0
5820         YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
5821                         obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
5822                         obj->sum, obj->chunkId));
5823                 switch(obj->variantType)
5824         {
5825                 case YAFFS_OBJECT_TYPE_FILE:
5826                         YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
5827                         break;
5828                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5829                         YPRINTF((" DIRECTORY\n"));
5830                         break;
5831                 case YAFFS_OBJECT_TYPE_HARDLINK: //todo
5832                 case YAFFS_OBJECT_TYPE_SYMLINK:
5833                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5834                 default:
5835         }
5836 #endif
5837
5838         return YAFFS_OK;
5839 }
5840
5841
5842 ///////////////////////// Initialisation code ///////////////////////////
5843
5844
5845 int yaffs_CheckDevFunctions(const yaffs_Device *dev)
5846 {
5847
5848         // Common functions, gotta have
5849         if(!dev->eraseBlockInNAND ||
5850            !dev->initialiseNAND) return 0;
5851
5852 #ifdef CONFIG_YAFFS_YAFFS2
5853
5854         // Can use the "with tags" style interface for yaffs1 or yaffs2
5855         if(dev->writeChunkWithTagsToNAND &&
5856            dev->readChunkWithTagsFromNAND &&
5857            !dev->writeChunkToNAND &&
5858            !dev->readChunkFromNAND &&
5859            dev->markNANDBlockBad &&
5860            dev->queryNANDBlock) return 1;
5861 #endif
5862
5863         // Can use the "spare" style interface for yaffs1
5864         if(!dev->isYaffs2 &&
5865            !dev->writeChunkWithTagsToNAND &&
5866            !dev->readChunkWithTagsFromNAND &&
5867            dev->writeChunkToNAND &&
5868            dev->readChunkFromNAND &&
5869            !dev->markNANDBlockBad &&
5870            !dev->queryNANDBlock) return 1;
5871
5872         return 0; // bad
5873 }
5874
5875
5876 int yaffs_GutsInitialise(yaffs_Device *dev)
5877 {
5878         unsigned x;
5879         int bits;
5880         int extraBits;
5881         int nBlocks;
5882
5883         T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
5884         // Check stuff that must be set
5885
5886         if(!dev)
5887         {
5888                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Need a device" TENDSTR)));
5889                 return YAFFS_FAIL;
5890         }
5891
5892         dev->internalStartBlock = dev->startBlock;
5893         dev->internalEndBlock =  dev->endBlock;
5894         dev->blockOffset = 0;
5895         dev->chunkOffset = 0;
5896         dev->nFreeChunks = 0;
5897
5898         if(dev->startBlock == 0)
5899         {
5900                 dev->internalStartBlock = dev->startBlock + 1;
5901                 dev->internalEndBlock =  dev->endBlock + 1;
5902                 dev->blockOffset = 1;
5903                 dev->chunkOffset = dev->nChunksPerBlock;
5904         }
5905
5906         // Check geometry parameters.
5907
5908         if(     (dev->isYaffs2 && dev->nBytesPerChunk <1024)  ||
5909                 (!dev->isYaffs2 && dev->nBytesPerChunk !=512)  ||
5910                 dev->nChunksPerBlock < 2 ||
5911                 dev->nReservedBlocks < 2 ||
5912                 dev->internalStartBlock <= 0 ||
5913                 dev->internalEndBlock <= 0 ||
5914                 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
5915           )
5916         {
5917                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s " TENDSTR),
5918                    dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
5919                 return YAFFS_FAIL;
5920         }
5921
5922         if(yaffs_InitialiseNAND(dev) != YAFFS_OK)
5923         {
5924                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5925                 return YAFFS_FAIL;
5926         }
5927
5928         // Got the right mix of functions?
5929         //
5930         if(!yaffs_CheckDevFunctions(dev))
5931         {
5932                 //Function missing
5933                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5934
5935                 return YAFFS_FAIL;
5936         }
5937
5938         // This is really a compilation check.
5939         if(!yaffs_CheckStructures())
5940         {
5941                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
5942                 return YAFFS_FAIL;
5943         }
5944
5945         if(dev->isMounted)
5946         {
5947                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device already mounted\n" TENDSTR)));
5948                 return YAFFS_FAIL;
5949         }
5950
5951         //
5952         //
5953         // Finished with most checks. One or two more checks happen later on too.
5954         //
5955
5956         dev->isMounted = 1;
5957
5958
5959         nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5960
5961
5962
5963         // OK now calculate a few things for the device
5964         // Calculate chunkGroupBits.
5965         // We need to find the next power of 2 > than internalEndBlock
5966
5967         x = dev->nChunksPerBlock * (dev->internalEndBlock+1);
5968
5969         for(bits = extraBits = 0; x > 1; bits++)
5970         {
5971                 if(x & 1) extraBits++;
5972                 x >>= 1;
5973         }
5974
5975         if(extraBits > 0) bits++;
5976
5977
5978         // Level0 Tnodes are 16 bits, so if the bitwidth of the
5979         // chunk range we're using is greater than 16 we need
5980         // to figure out chunk shift and chunkGroupSize
5981         if(bits <= 16)
5982         {
5983                 dev->chunkGroupBits = 0;
5984         }
5985         else
5986         {
5987                 dev->chunkGroupBits = bits - 16;
5988         }
5989
5990         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
5991
5992         if(dev->nChunksPerBlock < dev->chunkGroupSize)
5993         {
5994                 // We have a problem because the soft delete won't work if
5995                 // the chunk group size > chunks per block.
5996                 // This can be remedied by using larger "virtual blocks".
5997                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: chunk group too large\n" TENDSTR)));
5998
5999                 return YAFFS_FAIL;
6000         }
6001
6002
6003         // OK, we've finished verifying the device, lets continue with initialisation
6004
6005         // More device initialisation
6006         dev->garbageCollections = 0;
6007         dev->passiveGarbageCollections = 0;
6008         dev->currentDirtyChecker = 0;
6009         dev->bufferedBlock = -1;
6010         dev->doingBufferedBlockRewrite = 0;
6011         dev->nDeletedFiles = 0;
6012         dev->nBackgroundDeletions=0;
6013         dev->nUnlinkedFiles = 0;
6014         dev->eccFixed=0;
6015         dev->eccUnfixed=0;
6016         dev->tagsEccFixed=0;
6017         dev->tagsEccUnfixed=0;
6018         dev->nErasureFailures = 0;
6019         dev->nErasedBlocks = 0;
6020
6021         //dev->localBuffer = YMALLOC(dev->nBytesPerChunk);
6022         // Initialise temporary buffers
6023         {
6024                 int i;
6025                 for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
6026                 {
6027                         dev->tempBuffer[i].line = 0; // not in use
6028                         dev->tempBuffer[i].buffer = YMALLOC(dev->nBytesPerChunk);
6029                 }
6030         }
6031
6032
6033
6034         yaffs_InitialiseBlocks(dev,nBlocks);
6035
6036         yaffs_InitialiseTnodes(dev);
6037
6038         yaffs_InitialiseObjects(dev);
6039
6040         dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
6041
6042         if(dev->nShortOpCaches > 0)
6043         {
6044                 int i;
6045
6046                 if(dev->nShortOpCaches >  YAFFS_MAX_SHORT_OP_CACHES)
6047                 {
6048                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
6049                 }
6050
6051                 dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
6052
6053                 for(i=0; i < dev->nShortOpCaches; i++)
6054                 {
6055                         dev->srCache[i].object = NULL;
6056                         dev->srCache[i].lastUse = 0;
6057                         dev->srCache[i].dirty = 0;
6058                         dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
6059                 }
6060                 dev->srLastUse = 0;
6061         }
6062
6063         dev->cacheHits = 0;
6064
6065
6066         // Initialise the unlinked, root and lost and found directories
6067         dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = dev->deletedDir = NULL;
6068
6069         dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
6070         dev->deletedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_DELETED, S_IFDIR);
6071
6072         dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
6073         dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
6074         yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
6075
6076         if(dev->isYaffs2)
6077         {
6078                 dev->useHeaderFileSize = 1;
6079         }
6080
6081         // Now scan the flash.
6082
6083         if(dev->isYaffs2)
6084                 yaffs_ScanBackwards(dev);
6085         else
6086                 yaffs_Scan(dev);
6087
6088         // Zero out stats
6089         dev->nPageReads = 0;
6090         dev->nPageWrites =  0;
6091         dev->nBlockErasures = 0;
6092         dev->nGCCopies = 0;
6093         dev->nRetriedWrites = 0;
6094
6095         dev->nRetiredBlocks = 0;
6096
6097         yaffs_VerifyFreeChunks(dev);
6098
6099         T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
6100         return YAFFS_OK;
6101
6102 }
6103
6104 void yaffs_Deinitialise(yaffs_Device *dev)
6105 {
6106         if(dev->isMounted)
6107         {
6108                 int i;
6109
6110                 yaffs_DeinitialiseBlocks(dev);
6111                 yaffs_DeinitialiseTnodes(dev);
6112                 yaffs_DeinitialiseObjects(dev);
6113                 if(dev->nShortOpCaches > 0)
6114                 {
6115
6116                         for(i=0; i < dev->nShortOpCaches; i++)
6117                         {
6118                                 YFREE(dev->srCache[i].data);
6119                         }
6120
6121                         YFREE(dev->srCache);
6122                 }
6123
6124                 YFREE(dev->gcCleanupList);
6125
6126                 for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
6127                 {
6128                         YFREE(dev->tempBuffer[i].buffer);
6129                 }
6130
6131                 dev->isMounted = 0;
6132         }
6133
6134 }
6135
6136 #if 0
6137
6138 int  yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
6139 {
6140         int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * YAFFS_RESERVED_BLOCKS);
6141
6142         struct list_head *i;
6143         yaffs_Object *l;
6144
6145
6146         // To the free chunks add the chunks that are in the deleted unlinked files.
6147         list_for_each(i,&dev->deletedDir->variant.directoryVariant.children)
6148         {
6149                 l = list_entry(i, yaffs_Object,siblings);
6150                 if(l->deleted)
6151                 {
6152                         nFree++;
6153                         nFree += l->nDataChunks;
6154                 }
6155         }
6156
6157
6158         // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree);
6159
6160         if(nFree < 0) nFree = 0;
6161
6162         return nFree;
6163
6164 }
6165
6166 #endif
6167
6168 static int  yaffs_CountFreeChunks(yaffs_Device *dev)
6169 {
6170         int nFree;
6171         int b;
6172
6173         yaffs_BlockInfo *blk;
6174
6175
6176         for(nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock; b++)
6177         {
6178                 blk = yaffs_GetBlockInfo(dev,b);
6179
6180                 switch(blk->blockState)
6181                 {
6182                         case YAFFS_BLOCK_STATE_EMPTY:
6183                         case YAFFS_BLOCK_STATE_ALLOCATING:
6184                         case YAFFS_BLOCK_STATE_COLLECTING:
6185                         case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse + blk->softDeletions); break;
6186                         default: break;
6187                 }
6188
6189         }
6190
6191         return nFree;
6192 }
6193
6194
6195
6196 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
6197 {
6198         // This is what we report to the outside world
6199
6200         int nFree;
6201         int nDirtyCacheChunks;
6202
6203 #if 1
6204         nFree = dev->nFreeChunks;
6205 #else
6206         nFree = yaffs_CountFreeChunks(dev);
6207 #endif
6208
6209         // Now count the number of dirty chunks in the cache and subtract those
6210
6211         {
6212                 int i;
6213                 for( nDirtyCacheChunks = 0,i = 0; i < dev->nShortOpCaches; i++)
6214                 {
6215                         if(dev->srCache[i].dirty) nDirtyCacheChunks++;
6216                 }
6217         }
6218
6219         nFree -= nDirtyCacheChunks;
6220
6221         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
6222
6223         if(nFree < 0) nFree = 0;
6224
6225         return nFree;
6226
6227 }
6228
6229 static int  yaffs_freeVerificationFailures;
6230
6231 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
6232 {
6233         int counted = yaffs_CountFreeChunks(dev);
6234
6235         int difference = dev->nFreeChunks - counted;
6236
6237         if(difference)
6238         {
6239                 T(YAFFS_TRACE_ALWAYS,(TSTR("Freechunks verification failure %d %d %d" TENDSTR),dev->nFreeChunks,counted,difference));
6240                 yaffs_freeVerificationFailures++;
6241         }
6242 }
6243
6244 /////////////////// YAFFS test code //////////////////////////////////
6245
6246 #define yaffs_CheckStruct(structure,syze, name) \
6247            if(sizeof(structure) != syze) \
6248                { \
6249                  T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \
6250                  return YAFFS_FAIL; \
6251                    }
6252
6253
6254 static int yaffs_CheckStructures(void)
6255 {
6256 //      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")
6257 //      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")
6258 //      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")
6259 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
6260         yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")
6261 #endif
6262         yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")
6263
6264
6265         return YAFFS_OK;
6266 }
6267
6268 #if 0
6269 void yaffs_GutsTest(yaffs_Device *dev)
6270 {
6271
6272         if(yaffs_CheckStructures() != YAFFS_OK)
6273         {
6274                 T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
6275                 return;
6276         }
6277
6278         yaffs_TnodeTest(dev);
6279         yaffs_ObjectTest(dev);
6280 }
6281 #endif
6282
6283