yaffs_guts.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffs_guts.c  The main guts of YAFFS
   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 1.28 2003-08-20 03:53:39 charles Exp $";
  18
  19 #include "yportenv.h"
  20
  21 #include "yaffsinterface.h"
  22 #include "yaffs_guts.h"
  23
  24 #define YAFFS_PASSIVE_GC_CHUNKS 2
  25
  26 #if 0
  27 // Use Steven Hill's ECC struff instead
  28 // External functions for ECC on data
  29 void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);
  30 int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);
  31 #define yaffs_ECCCalculate(data,ecc) nand_calculate_ecc(data,ecc)
  32 #define yaffs_ECCCorrect(data,read_ecc,calc_ecc) nand_correct_ecc(data,read_ecc,calc_ecc)
  33 #else
  34 #include "yaffs_ecc.h"
  35 #endif
  36
  37 // countBits is a quick way of counting the number of bits in a byte.
  38 // ie. countBits[n] holds the number of 1 bits in a byte with the value n.
  39
  40 static const char yaffs_countBitsTable[256] =
  41 {
  42 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
  43 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  44 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  45 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  46 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  47 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  48 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  49 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  50 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  51 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  52 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  53 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  54 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  55 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  56 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  57 4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
  58 };
  59
  60 static int yaffs_CountBits(__u8 x)
  61 {
  62         int retVal;
  63         retVal = yaffs_countBitsTable[x];
  64         return retVal;
  65 }
  66
  67
  68
  69 // Local prototypes
  70 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);
  71 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);
  72 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);
  73 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan);
  74
  75 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type);
  76 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj);
  77 static int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force);
  78 static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND);
  79 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
  80 static int yaffs_CheckStructures(void);
  81 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit);
  82 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
  83
  84 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo);
  85
  86 // Robustification
  87 static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);
  88 static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
  89 static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
  90 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare);
  91 static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare);
  92
  93 static int  yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);
  94
  95 static int yaffs_UnlinkWorker(yaffs_Object *obj);
  96 static void yaffs_AbortHalfCreatedObject(yaffs_Object *obj);
  97
  98 static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1);
  99
 100
 101
 102 loff_t yaffs_GetFileSize(yaffs_Object *obj);
 103
 104 static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);
 105 static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);
 106
 107
 108 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve);
 109
 110 #ifdef YAFFS_PARANOID
 111 static int yaffs_CheckFileSanity(yaffs_Object *in);
 112 #else
 113 #define yaffs_CheckFileSanity(in)
 114 #endif
 115
 116 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 117 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 118
 119 // Chunk bitmap manipulations
 120
 121 static __inline __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
 122 {
 123         if(blk < dev->startBlock || blk > dev->endBlock)
 124         {
 125                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),blk));
 126                 YBUG();
 127         }
 128         return dev->chunkBits + (dev->chunkBitmapStride * (blk - dev->startBlock));
 129 }
 130
 131 static __inline__ void yaffs_ClearChunkBits(yaffs_Device *dev,int blk)
 132 {
 133         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 134
 135          memset(blkBits,0,dev->chunkBitmapStride);
 136 }
 137
 138 static __inline__ void yaffs_ClearChunkBit(yaffs_Device *dev,int blk,int chunk)
 139 {
 140         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 141
 142         blkBits[chunk/8] &=  ~ (1<<(chunk & 7));
 143 }
 144
 145 static __inline__ void yaffs_SetChunkBit(yaffs_Device *dev,int blk,int chunk)
 146 {
 147         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 148
 149         blkBits[chunk/8] |=   (1<<(chunk & 7));
 150 }
 151
 152 static __inline__ int yaffs_CheckChunkBit(yaffs_Device *dev,int blk,int chunk)
 153 {
 154         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 155         return (blkBits[chunk/8] &  (1<<(chunk & 7))) ? 1 :0;
 156 }
 157
 158 static __inline__ int yaffs_StillSomeChunkBits(yaffs_Device *dev,int blk)
 159 {
 160         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 161         int i;
 162         for(i = 0; i < dev->chunkBitmapStride; i++)
 163         {
 164                 if(*blkBits) return 1;
 165                 blkBits++;
 166         }
 167         return 0;
 168 }
 169
 170 // Function to manipulate block info
 171 static  __inline__ yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk)
 172 {
 173         if(blk < dev->startBlock || blk > dev->endBlock)
 174         {
 175                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),blk));
 176                 YBUG();
 177         }
 178         return &dev->blockInfo[blk - dev->startBlock];
 179 }
 180
 181
 182 static  __inline__ int yaffs_HashFunction(int n)
 183 {
 184         return (n % YAFFS_NOBJECT_BUCKETS);
 185 }
 186
 187
 188 yaffs_Object *yaffs_Root(yaffs_Device *dev)
 189 {
 190         return dev->rootDir;
 191 }
 192
 193 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 194 {
 195         return dev->lostNFoundDir;
 196 }
 197
 198
 199 static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare)
 200 {
 201         if(chunkInNAND < dev->startBlock * dev->nChunksPerBlock)
 202         {
 203                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND));
 204                 return YAFFS_FAIL;
 205         }
 206
 207         dev->nPageWrites++;
 208         return dev->writeChunkToNAND(dev,chunkInNAND,data,spare);
 209 }
 210
 211
 212
 213 int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
 214                                                         int chunkInNAND,
 215                                                         __u8 *data,
 216                                                         yaffs_Spare *spare,
 217                                                         int doErrorCorrection)
 218 {
 219         int retVal;
 220         yaffs_Spare localSpare;
 221
 222         dev->nPageReads++;
 223
 224
 225
 226
 227         if(!spare && data)
 228         {
 229                 // If we don't have a real spare, then we use a local one.
 230                 // Need this for the calculation of the ecc
 231                 spare = &localSpare;
 232         }
 233
 234
 235         if(!dev->useNANDECC)
 236         {
 237                 retVal  = dev->readChunkFromNAND(dev,chunkInNAND,data,spare);
 238                 if(data && doErrorCorrection)
 239                 {
 240                         // Do ECC correction
 241                         //Todo handle any errors
 242                 int eccResult1,eccResult2;
 243                 __u8 calcEcc[3];
 244
 245                         yaffs_ECCCalculate(data,calcEcc);
 246                         eccResult1 = yaffs_ECCCorrect (data,spare->ecc1, calcEcc);
 247                         yaffs_ECCCalculate(&data[256],calcEcc);
 248                         eccResult2 = yaffs_ECCCorrect(&data[256],spare->ecc2, calcEcc);
 249
 250                         if(eccResult1>0)
 251                         {
 252                                 T(YAFFS_TRACE_ERROR, (TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
 253                                 dev->eccFixed++;
 254                         }
 255                         else if(eccResult1<0)
 256                         {
 257                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
 258                                 dev->eccUnfixed++;
 259                         }
 260
 261                         if(eccResult2>0)
 262                         {
 263                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
 264                                 dev->eccFixed++;
 265                         }
 266                         else if(eccResult2<0)
 267                         {
 268                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
 269                                 dev->eccUnfixed++;
 270                         }
 271
 272                         if(eccResult1 || eccResult2)
 273                         {
 274                                 // Hoosterman, we had a data problem on this page
 275                                 yaffs_HandleReadDataError(dev,chunkInNAND);
 276                         }
 277                 }
 278         }
 279         else
 280         {
 281         // Must allocate enough memory for spare+2*sizeof(int) for ecc results from device.
 282         struct yaffs_NANDSpare nspare;
 283                 retVal  = dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare*)&nspare);
 284                 memcpy (spare, &nspare, sizeof(yaffs_Spare));
 285                 if(data && doErrorCorrection)
 286                 {
 287                         if(nspare.eccres1>0)
 288                         {
 289                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
 290                         }
 291                         else if(nspare.eccres1<0)
 292                         {
 293                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
 294                         }
 295
 296                         if(nspare.eccres2>0)
 297                         {
 298                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
 299                         }
 300                         else if(nspare.eccres2<0)
 301                         {
 302                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
 303                         }
 304
 305                         if(nspare.eccres1 || nspare.eccres2)
 306                         {
 307                                 // Hoosterman, we had a data problem on this page
 308                                 yaffs_HandleReadDataError(dev,chunkInNAND);
 309                         }
 310
 311                 }
 312         }
 313         return retVal;
 314 }
 315
 316
 317 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)
 318 {
 319
 320         static int init = 0;
 321         static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
 322         static __u8 data[YAFFS_BYTES_PER_CHUNK];
 323     // Might as well always allocate the larger size for dev->useNANDECC == true;
 324         static __u8 spare[sizeof(struct yaffs_NANDSpare)];
 325
 326         dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare);
 327
 328         if(!init)
 329         {
 330                 memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK);
 331                 init = 1;
 332         }
 333
 334         if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) return  YAFFS_FAIL;
 335         if(memcmp(cmpbuf,spare,16)) return YAFFS_FAIL;
 336
 337
 338         return YAFFS_OK;
 339
 340 }
 341
 342
 343
 344 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
 345 {
 346         dev->nBlockErasures++;
 347         return dev->eraseBlockInNAND(dev,blockInNAND);
 348 }
 349
 350 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 351 {
 352         return dev->initialiseNAND(dev);
 353 }
 354
 355 static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve)
 356 {
 357         int chunk;
 358
 359         int writeOk = 1;
 360         int attempts = 0;
 361
 362         unsigned char rbData[YAFFS_BYTES_PER_CHUNK];
 363         yaffs_Spare rbSpare;
 364
 365         do{
 366                 chunk = yaffs_AllocateChunk(dev,useReserve);
 367
 368                 if(chunk >= 0)
 369                 {
 370
 371                         // First check this chunk is erased...
 372 #ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
 373                         writeOk = yaffs_CheckChunkErased(dev,chunk);
 374 #endif
 375                         if(!writeOk)
 376                         {
 377                                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
 378                         }
 379                         else
 380                         {
 381                                 writeOk =  yaffs_WriteChunkToNAND(dev,chunk,data,spare);
 382                         }
 383                         attempts++;
 384                         if(writeOk)
 385                         {
 386                                 // Readback & verify
 387                                 // If verify fails, then delete this chunk and try again
 388                                 // To verify we compare everything except the block and
 389                                 // page status bytes.
 390                                 // NB We check a raw read without ECC correction applied
 391                                 yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare,0);
 392
 393 #ifndef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
 394                                 if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare))
 395                                 {
 396                                         // Didn't verify
 397                                         T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write verify failed on chunk %d" TENDSTR), chunk));
 398
 399                                         writeOk = 0;
 400                                 }
 401 #endif
 402
 403                         }
 404                         if(writeOk)
 405                         {
 406                                 // Copy the data into the write buffer.
 407                                 // NB We do this at the end to prevent duplicates in the case of a write error.
 408                                 //Todo
 409                                 yaffs_HandleWriteChunkOk(dev,chunk,data,spare);
 410                         }
 411                         else
 412                         {
 413                                 yaffs_HandleWriteChunkError(dev,chunk);
 414                         }
 415                 }
 416
 417         } while(chunk >= 0 && ! writeOk);
 418
 419         if(attempts > 1)
 420         {
 421                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
 422                 dev->nRetriedWrites+= (attempts - 1);
 423         }
 424
 425         return chunk;
 426 }
 427
 428 ///
 429 // Functions for robustisizing
 430 //
 431 //
 432
 433 static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
 434 {
 435         // Ding the blockStatus in the first two pages of the block.
 436
 437         yaffs_Spare spare;
 438
 439         memset(&spare, 0xff,sizeof(yaffs_Spare));
 440
 441         spare.blockStatus = 0;
 442
 443         // TODO change this retirement marking for other NAND types
 444         yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL , &spare);
 445         yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1, NULL , &spare);
 446
 447         yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
 448         dev->nRetiredBlocks++;
 449 }
 450
 451
 452
 453 static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
 454 {
 455         dev->doingBufferedBlockRewrite = 1;
 456         //
 457         //      Remove erased chunks
 458         //  Rewrite existing chunks to a new block
 459         //      Set current write block to the new block
 460
 461         dev->doingBufferedBlockRewrite = 0;
 462
 463         return 1;
 464 }
 465
 466
 467 static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
 468 {
 469         int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
 470
 471         // Mark the block for retirement
 472         yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
 473         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
 474
 475
 476         //TODO
 477         // Just do a garbage collection on the affected block then retire the block
 478         // NB recursion
 479 }
 480
 481
 482 static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
 483 {
 484 }
 485
 486 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
 487 {
 488 }
 489
 490 static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare)
 491 {
 492 }
 493
 494 static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
 495 {
 496         int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
 497
 498         // Mark the block for retirement
 499         yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
 500         // Delete the chunk
 501         yaffs_DeleteChunk(dev,chunkInNAND,1);
 502 }
 503
 504
 505
 506
 507 static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1)
 508 {
 509
 510
 511         if( memcmp(d0,d1,YAFFS_BYTES_PER_CHUNK) != 0 ||
 512                 s0->tagByte0 != s1->tagByte0 ||
 513                 s0->tagByte1 != s1->tagByte1 ||
 514                 s0->tagByte2 != s1->tagByte2 ||
 515                 s0->tagByte3 != s1->tagByte3 ||
 516                 s0->tagByte4 != s1->tagByte4 ||
 517                 s0->tagByte5 != s1->tagByte5 ||
 518                 s0->tagByte6 != s1->tagByte6 ||
 519                 s0->tagByte7 != s1->tagByte7 ||
 520                 s0->ecc1[0]  != s1->ecc1[0]  ||
 521                 s0->ecc1[1]  != s1->ecc1[1]  ||
 522                 s0->ecc1[2]  != s1->ecc1[2]  ||
 523                 s0->ecc2[0]  != s1->ecc2[0]  ||
 524                 s0->ecc2[1]  != s1->ecc2[1]  ||
 525                 s0->ecc2[2]  != s1->ecc2[2] )
 526                 {
 527                         return 0;
 528                 }
 529
 530         return 1;
 531 }
 532
 533
 534 ///////////////////////// Object management //////////////////
 535 // List of spare objects
 536 // The list is hooked together using the first pointer
 537 // in the object
 538
 539 // static yaffs_Object *yaffs_freeObjects = NULL;
 540
 541 // static int yaffs_nFreeObjects;
 542
 543 // static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;
 544
 545 // static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];
 546
 547
 548 static __u16 yaffs_CalcNameSum(const char *name)
 549 {
 550         __u16 sum = 0;
 551         __u16 i = 1;
 552
 553         __u8 *bname = (__u8 *)name;
 554         if(bname)
 555         {
 556                 while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))
 557                 {
 558
 559 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
 560                         sum += toupper(*bname) * i;
 561 #else
 562                         sum += (*bname) * i;
 563 #endif
 564                         i++;
 565                         bname++;
 566                 }
 567         }
 568         return sum;
 569 }
 570
 571 void yaffs_SetObjectName(yaffs_Object *obj, const char *name)
 572 {
 573 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
 574                                         if(name && strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
 575                                         {
 576                                                 strcpy(obj->shortName,name);
 577                                         }
 578                                         else
 579                                         {
 580                                                 obj->shortName[0]='\0';
 581                                         }
 582 #endif
 583                                         obj->sum = yaffs_CalcNameSum(name);
 584 }
 585
 586 void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
 587 {
 588         yaffs_ECCCalculate(data , spare->ecc1);
 589         yaffs_ECCCalculate(&data[256] , spare->ecc2);
 590 }
 591
 592 void yaffs_CalcTagsECC(yaffs_Tags *tags)
 593 {
 594         // Calculate an ecc
 595
 596         unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
 597         unsigned  i,j;
 598         unsigned  ecc = 0;
 599         unsigned bit = 0;
 600
 601         tags->ecc = 0;
 602
 603         for(i = 0; i < 8; i++)
 604         {
 605                 for(j = 1; j &0xff; j<<=1)
 606                 {
 607                         bit++;
 608                         if(b[i] & j)
 609                         {
 610                                 ecc ^= bit;
 611                         }
 612                 }
 613         }
 614
 615         tags->ecc = ecc;
 616
 617
 618 }
 619
 620 int  yaffs_CheckECCOnTags(yaffs_Tags *tags)
 621 {
 622         unsigned ecc = tags->ecc;
 623
 624         yaffs_CalcTagsECC(tags);
 625
 626         ecc ^= tags->ecc;
 627
 628         if(ecc && ecc <= 64)
 629         {
 630                 // TODO: Handle the failure better. Retire?
 631                 unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
 632
 633                 ecc--;
 634
 635                 b[ecc / 8] ^= (1 << (ecc & 7));
 636
 637                 // Now recvalc the ecc
 638                 yaffs_CalcTagsECC(tags);
 639
 640                 return 1; // recovered error
 641         }
 642         else if(ecc)
 643         {
 644                 // Wierd ecc failure value
 645                 // TODO Need to do somethiong here
 646                 return -1; //unrecovered error
 647         }
 648
 649         return 0;
 650 }
 651
 652
 653 ///////////////////////// TNODES ///////////////////////
 654
 655 // List of spare tnodes
 656 // The list is hooked together using the first pointer
 657 // in the tnode.
 658
 659 //static yaffs_Tnode *yaffs_freeTnodes = NULL;
 660
 661 // static int yaffs_nFreeTnodes;
 662
 663 //static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;
 664
 665
 666
 667 // yaffs_CreateTnodes creates a bunch more tnodes and
 668 // adds them to the tnode free list.
 669 // Don't use this function directly
 670
 671 static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes)
 672 {
 673     int i;
 674     yaffs_Tnode *newTnodes;
 675     yaffs_TnodeList *tnl;
 676
 677     if(nTnodes < 1) return YAFFS_OK;
 678
 679         // make these things
 680
 681     newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
 682
 683     if (!newTnodes)
 684     {
 685                 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));
 686                 return YAFFS_FAIL;
 687     }
 688
 689     // Hook them into the free list
 690     for(i = 0; i < nTnodes - 1; i++)
 691     {
 692         newTnodes[i].internal[0] = &newTnodes[i+1];
 693 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 694         newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = 1;
 695 #endif
 696     }
 697
 698         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
 699 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 700         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = 1;
 701 #endif
 702         dev->freeTnodes = newTnodes;
 703         dev->nFreeTnodes+= nTnodes;
 704         dev->nTnodesCreated += nTnodes;
 705
 706         // Now add this bunch of tnodes to a list for freeing up.
 707         // NB If we can't add this to the management list it isn't fatal
 708         // but it just means we can't free this bunch of tnodes later.
 709         tnl = YMALLOC(sizeof(yaffs_TnodeList));
 710         if(!tnl)
 711         {
 712                 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR)));
 713
 714         }
 715         else
 716         {
 717                 tnl->tnodes = newTnodes;
 718                 tnl->next = dev->allocatedTnodeList;
 719                 dev->allocatedTnodeList = tnl;
 720         }
 721
 722
 723         T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));
 724
 725
 726         return YAFFS_OK;
 727 }
 728
 729
 730 // GetTnode gets us a clean tnode. Tries to make allocate more if we run out
 731 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
 732 {
 733         yaffs_Tnode *tn = NULL;
 734
 735         // If there are none left make more
 736         if(!dev->freeTnodes)
 737         {
 738                 yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES);
 739         }
 740
 741         if(dev->freeTnodes)
 742         {
 743                 tn = dev->freeTnodes;
 744 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 745         if(tn->internal[YAFFS_NTNODES_INTERNAL] != 1)
 746                 {
 747                         // Hoosterman, this thing looks like it isn't in the list
 748                                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 1" TENDSTR)));
 749                 }
 750 #endif
 751                 dev->freeTnodes = dev->freeTnodes->internal[0];
 752                 dev->nFreeTnodes--;
 753                 // zero out
 754                 memset(tn,0,sizeof(yaffs_Tnode));
 755         }
 756
 757
 758         return tn;
 759 }
 760
 761
 762 // FreeTnode frees up a tnode and puts it back on the free list
 763 static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn)
 764 {
 765         if(tn)
 766         {
 767 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 768         if(tn->internal[YAFFS_NTNODES_INTERNAL] != 0)
 769                 {
 770                         // Hoosterman, this thing looks like it is already in the list
 771                                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 2" TENDSTR)));
 772                 }
 773                 tn->internal[YAFFS_NTNODES_INTERNAL] = 1;
 774 #endif
 775                 tn->internal[0] = dev->freeTnodes;
 776                 dev->freeTnodes = tn;
 777                 dev->nFreeTnodes++;
 778         }
 779 }
 780
 781
 782 static void yaffs_DeinitialiseTnodes(yaffs_Device*dev)
 783 {
 784         // Free the list of allocated tnodes
 785         yaffs_TnodeList *tmp;
 786
 787         while(dev->allocatedTnodeList)
 788         {
 789                 tmp =  dev->allocatedTnodeList->next;
 790
 791                 YFREE(dev->allocatedTnodeList->tnodes);
 792                 YFREE(dev->allocatedTnodeList);
 793                 dev->allocatedTnodeList = tmp;
 794
 795         }
 796
 797         dev->freeTnodes = NULL;
 798         dev->nFreeTnodes = 0;
 799 }
 800
 801 static void yaffs_InitialiseTnodes(yaffs_Device*dev)
 802 {
 803         dev->allocatedTnodeList = NULL;
 804         dev->freeTnodes = NULL;
 805         dev->nFreeTnodes = 0;
 806         dev->nTnodesCreated = 0;
 807
 808 }
 809
 810 #if 0
 811 void yaffs_TnodeTest(yaffs_Device *dev)
 812 {
 813
 814         int i;
 815         int j;
 816         yaffs_Tnode *tn[1000];
 817
 818         YINFO("Testing TNodes");
 819
 820         for(j = 0; j < 50; j++)
 821         {
 822                 for(i = 0; i < 1000; i++)
 823                 {
 824                         tn[i] = yaffs_GetTnode(dev);
 825                         if(!tn[i])
 826                         {
 827                                 YALERT("Getting tnode failed");
 828                         }
 829                 }
 830                 for(i = 0; i < 1000; i+=3)
 831                 {
 832                         yaffs_FreeTnode(dev,tn[i]);
 833                         tn[i] = NULL;
 834                 }
 835
 836         }
 837 }
 838 #endif
 839
 840
 841 ////////////////// END OF TNODE MANIPULATION ///////////////////////////
 842
 843 /////////////// Functions to manipulate the look-up tree (made up of tnodes)
 844 // The look up tree is represented by the top tnode and the number of topLevel
 845 // in the tree. 0 means only the level 0 tnode is in the tree.
 846
 847
 848 // FindLevel0Tnode finds the level 0 tnode, if one exists.
 849 // Used when reading.....
 850 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId)
 851 {
 852
 853         yaffs_Tnode *tn = fStruct->top;
 854         __u32 i;
 855         int requiredTallness;
 856         int level = fStruct->topLevel;
 857
 858         // Check sane level and chunk Id
 859         if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
 860         {
 861 //              char str[50];
 862 //              sprintf(str,"Bad level %d",level);
 863 //              YALERT(str);
 864                 return NULL;
 865         }
 866
 867         if(chunkId > YAFFS_MAX_CHUNK_ID)
 868         {
 869 //              char str[50];
 870 //              sprintf(str,"Bad chunkId %d",chunkId);
 871 //              YALERT(str);
 872                 return NULL;
 873         }
 874
 875         // First check we're tall enough (ie enough topLevel)
 876
 877         i = chunkId >> (/*dev->chunkGroupBits  + */YAFFS_TNODES_LEVEL0_BITS);
 878         requiredTallness = 0;
 879         while(i)
 880         {
 881                 i >>= YAFFS_TNODES_INTERNAL_BITS;
 882                 requiredTallness++;
 883         }
 884
 885
 886         if(requiredTallness > fStruct->topLevel)
 887         {
 888                 // Not tall enough, so we can't find it, return NULL.
 889                 return NULL;
 890         }
 891
 892
 893         // Traverse down to level 0
 894         while (level > 0 && tn)
 895         {
 896             tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) &
 897                                YAFFS_TNODES_INTERNAL_MASK];
 898                 level--;
 899
 900         }
 901
 902         return tn;
 903 }
 904
 905 // AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
 906 // This happens in two steps:
 907 //  1. If the tree isn't tall enough, then make it taller.
 908 //  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
 909 //
 910 // Used when modifying the tree.
 911 //
 912 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
 913 {
 914
 915         yaffs_Tnode *tn;
 916
 917         int requiredTallness;
 918         int i;
 919         int l;
 920
 921         __u32 x;
 922
 923
 924         //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
 925
 926         // Check sane level and page Id
 927         if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
 928         {
 929 //              char str[50];
 930 //              sprintf(str,"Bad level %d",fStruct->topLevel);
 931 //              YALERT(str);
 932                 return NULL;
 933         }
 934
 935         if(chunkId > YAFFS_MAX_CHUNK_ID)
 936         {
 937 //              char str[50];
 938 //              sprintf(str,"Bad chunkId %d",chunkId);
 939 //              YALERT(str);
 940                 return NULL;
 941         }
 942
 943         // First check we're tall enough (ie enough topLevel)
 944
 945         x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
 946         requiredTallness = 0;
 947         while(x)
 948         {
 949                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 950                 requiredTallness++;
 951         }
 952
 953         //T((TSTR(" required=%d"),requiredTallness));
 954
 955
 956         if(requiredTallness > fStruct->topLevel)
 957         {
 958                 // Not tall enough,gotta make the tree taller
 959                 for(i = fStruct->topLevel; i < requiredTallness; i++)
 960                 {
 961                         //T((TSTR(" add new top")));
 962
 963                         tn = yaffs_GetTnode(dev);
 964
 965                         if(tn)
 966                         {
 967                                 tn->internal[0] = fStruct->top;
 968                                 fStruct->top = tn;
 969                         }
 970                         else
 971                         {
 972                                         T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));
 973                         }
 974                 }
 975
 976                 fStruct->topLevel = requiredTallness;
 977         }
 978
 979
 980         // Traverse down to level 0, adding anything we need
 981
 982         l = fStruct->topLevel;
 983         tn = fStruct->top;
 984         while (l > 0 && tn)
 985         {
 986                 x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
 987                                YAFFS_TNODES_INTERNAL_MASK;
 988
 989                 //T((TSTR(" [%d:%d]"),l,i));
 990
 991             if(!tn->internal[x])
 992             {
 993                 //T((TSTR(" added")));
 994
 995                 tn->internal[x] = yaffs_GetTnode(dev);
 996             }
 997
 998             tn =        tn->internal[x];
 999                 l--;
1000
1001         }
1002
1003         //TSTR(TENDSTR)));
1004
1005         return tn;
1006 }
1007
1008 // DeleteWorker scans backwards through the tnode tree and deletes all the
1009 // chunks and tnodes in the file
1010 // Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1011
1012 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit)
1013 {
1014         int i;
1015         int chunkInInode;
1016         int theChunk;
1017         yaffs_Tags tags;
1018         int found;
1019         int chunkDeleted;
1020         int allDone = 1;
1021
1022
1023         if(tn)
1024         {
1025                 if(level > 0)
1026                 {
1027
1028                         for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1029                         {
1030                             if(tn->internal[i])
1031                         {
1032                                         if(limit && (*limit) < 0)
1033                                         {
1034                                                 allDone = 0;
1035                                         }
1036                                         else
1037                                         {
1038                                                 allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1,
1039                                                                                 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit);
1040                                         }
1041                                         if(allDone)
1042                                         {
1043                                                 yaffs_FreeTnode(in->myDev,tn->internal[i]);
1044                                         tn->internal[i] = NULL;
1045                                         }
1046                             }
1047
1048                         }
1049                         return (allDone) ? 1 : 0;
1050                 }
1051                 else if(level == 0)
1052                 {
1053                         int hitLimit = 0;
1054
1055                         for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0 && !hitLimit; i--)
1056                         {
1057                             if(tn->level0[i])
1058                         {
1059                                         int j;
1060
1061                                         chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
1062
1063                                         theChunk =  tn->level0[i] << in->myDev->chunkGroupBits;
1064
1065                                         // Now we need to search for it
1066                                         for(j = 0,found = 0; theChunk && j < in->myDev->chunkGroupSize && !found; j++)
1067                                         {
1068                                                 yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,&tags,&chunkDeleted);
1069                                                 if(yaffs_TagsMatch(&tags,in->objectId,chunkInInode,chunkDeleted))
1070                                                 {
1071                                                         // found it;
1072                                                         found = 1;
1073
1074                                                 }
1075                                                 else
1076                                                 {
1077                                                         theChunk++;
1078                                                 }
1079                                         }
1080
1081                                         if(found)
1082                                         {
1083                                                 yaffs_DeleteChunk(in->myDev,theChunk,1);
1084                                                 in->nDataChunks--;
1085                                                 if(limit)
1086                                                 {
1087                                                         *limit = *limit-1;
1088                                                         if(limit <= 0)
1089                                                         {
1090                                                                 hitLimit = 1;
1091                                                         }
1092                                                 }
1093
1094                                         }
1095
1096                                 tn->level0[i] = 0;
1097                             }
1098
1099                         }
1100                         return (i < 0) ? 1 : 0;
1101
1102
1103                 }
1104
1105         }
1106
1107         return 1;
1108
1109 }
1110
1111 // SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1112 // All soft deleting does is increment the block's softdelete count and pulls the chunk out
1113 // of the tnode.
1114 // THus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1115 //
1116 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset)
1117 {
1118         int i;
1119         int chunkInInode;
1120         int theChunk;
1121         yaffs_BlockInfo *theBlock;
1122         yaffs_Tags tags;
1123         int found;
1124         int chunkDeleted;
1125         int allDone = 1;
1126
1127
1128         if(tn)
1129         {
1130                 if(level > 0)
1131                 {
1132
1133                         for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1134                         {
1135                             if(tn->internal[i])
1136                         {
1137                                                 allDone = yaffs_SoftDeleteWorker(in,tn->internal[i],level - 1,
1138                                                                                 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i);
1139                                         if(allDone)
1140                                         {
1141                                                 yaffs_FreeTnode(in->myDev,tn->internal[i]);
1142                                         tn->internal[i] = NULL;
1143                                         }
1144                                         else
1145                                         {
1146                                                 //Hoosterman... how could this happen.
1147                                         }
1148                                 }
1149                         }
1150                         return (allDone) ? 1 : 0;
1151                 }
1152                 else if(level == 0)
1153                 {
1154
1155                         for(i = YAFFS_NTNODES_LEVEL0 -1; i >=0; i--)
1156                         {
1157                             if(tn->level0[i])
1158                         {
1159                                         theChunk =  (tn->level0[i] << in->myDev->chunkGroupBits);
1160                                         T(YAFFS_TRACE_SCAN,(TSTR("soft delete tch %d cgb %d chunk %d" TENDSTR),
1161                                                 tn->level0[i],in->myDev->chunkGroupBits,theChunk));
1162
1163                                         theBlock =      yaffs_GetBlockInfo(in->myDev,  theChunk/in->myDev->nChunksPerBlock);
1164                                         if(theBlock)
1165                                         {
1166                                                 theBlock->softDeletions++;
1167                                         }
1168                                 tn->level0[i] = 0;
1169                             }
1170
1171                         }
1172                         return 1;
1173
1174                 }
1175
1176         }
1177
1178         return 1;
1179
1180 }
1181
1182
1183
1184 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1185 {
1186         if(obj->deleted &&
1187            obj->variantType == YAFFS_OBJECT_TYPE_FILE &&
1188            !obj->softDeleted)
1189         {
1190                 if(obj->nDataChunks <= 0)
1191                 {
1192                                 // Empty file, just delete it immediately
1193                                 yaffs_FreeTnode(obj->myDev,obj->variant.fileVariant.top);
1194                                 obj->variant.fileVariant.top = NULL;
1195                                 T(YAFFS_TRACE_TRACING,(TSTR("yaffs: Deleting empty file %d" TENDSTR),obj->objectId));
1196                                 yaffs_DoGenericObjectDeletion(obj);
1197                 }
1198                 else
1199                 {
1200                         yaffs_SoftDeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0);
1201                         obj->softDeleted = 1;
1202                 }
1203         }
1204 }
1205
1206
1207
1208
1209
1210 // Pruning removes any part of the file structure tree that is beyond the
1211 // bounds of the file (ie that does not point to chunks).
1212 //
1213 // A file should only get pruned when its size is reduced.
1214 //
1215 // Before pruning, the chunks must be pulled from the tree and the
1216 // level 0 tnode entries must be zeroed out.
1217 // Could also use this for file deletion, but that's probably better handled
1218 // by a special case.
1219
1220 // yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
1221
1222 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
1223 {
1224         int i;
1225         int hasData;
1226
1227         if(tn)
1228         {
1229                 hasData = 0;
1230
1231                 for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
1232                 {
1233                     if(tn->internal[i] && level > 0)
1234                     {
1235                         tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
1236                     }
1237
1238                     if(tn->internal[i])
1239                     {
1240                         hasData++;
1241                         }
1242                 }
1243
1244                 if(hasData == 0 && del0)
1245                 {
1246                         // Free and return NULL
1247
1248                         yaffs_FreeTnode(dev,tn);
1249                         tn = NULL;
1250                 }
1251
1252         }
1253
1254         return tn;
1255
1256 }
1257
1258 static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)
1259 {
1260         int i;
1261         int hasData;
1262         int done = 0;
1263         yaffs_Tnode *tn;
1264
1265         if(fStruct->topLevel > 0)
1266         {
1267                 fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);
1268
1269                 // Now we have a tree with all the non-zero branches NULL but the height
1270                 // is the same as it was.
1271                 // Let's see if we can trim internal tnodes to shorten the tree.
1272                 // We can do this if only the 0th element in the tnode is in use
1273                 // (ie all the non-zero are NULL)
1274
1275                 while(fStruct->topLevel && !done)
1276                 {
1277                         tn = fStruct->top;
1278
1279                         hasData = 0;
1280                         for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)
1281                         {
1282                                 if(tn->internal[i])
1283                         {
1284                                 hasData++;
1285                                 }
1286                         }
1287
1288                         if(!hasData)
1289                         {
1290                                 fStruct->top = tn->internal[0];
1291                                 fStruct->topLevel--;
1292                                 yaffs_FreeTnode(dev,tn);
1293                         }
1294                         else
1295                         {
1296                                 done = 1;
1297                         }
1298                 }
1299         }
1300
1301         return YAFFS_OK;
1302 }
1303
1304
1305
1306
1307
1308 /////////////////////// End of File Structure functions. /////////////////
1309
1310 // yaffs_CreateFreeObjects creates a bunch more objects and
1311 // adds them to the object free list.
1312 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1313 {
1314     int i;
1315     yaffs_Object *newObjects;
1316     yaffs_ObjectList *list;
1317
1318     if(nObjects < 1) return YAFFS_OK;
1319
1320         // make these things
1321
1322     newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1323
1324     if (!newObjects)
1325     {
1326                 T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1327                 return YAFFS_FAIL;
1328     }
1329
1330     // Hook them into the free list
1331     for(i = 0; i < nObjects - 1; i++)
1332     {
1333         newObjects[i].siblings.next = (struct list_head *)(&newObjects[i+1]);
1334     }
1335
1336         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1337         dev->freeObjects = newObjects;
1338         dev->nFreeObjects+= nObjects;
1339         dev->nObjectsCreated+= nObjects;
1340
1341         // Now add this bunch of Objects to a list for freeing up.
1342
1343         list = YMALLOC(sizeof(yaffs_ObjectList));
1344         if(!list)
1345         {
1346                 T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
1347         }
1348         else
1349         {
1350                 list->objects = newObjects;
1351                 list->next = dev->allocatedObjectList;
1352                 dev->allocatedObjectList = list;
1353         }
1354
1355
1356
1357         return YAFFS_OK;
1358 }
1359
1360
1361 // AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
1362 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1363 {
1364         yaffs_Object *tn = NULL;
1365
1366         // If there are none left make more
1367         if(!dev->freeObjects)
1368         {
1369                 yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);
1370         }
1371
1372         if(dev->freeObjects)
1373         {
1374                 tn = dev->freeObjects;
1375                 dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);
1376                 dev->nFreeObjects--;
1377
1378                 // Now sweeten it up...
1379
1380                 memset(tn,0,sizeof(yaffs_Object));
1381                 tn->myDev = dev;
1382                 tn->chunkId = -1;
1383                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1384                 INIT_LIST_HEAD(&(tn->hardLinks));
1385                 INIT_LIST_HEAD(&(tn->hashLink));
1386                 INIT_LIST_HEAD(&tn->siblings);
1387
1388                 // Add it to the lost and found directory.
1389                 // NB Can't put root or lostNFound in lostNFound so
1390                 // check if lostNFound exists first
1391                 if(dev->lostNFoundDir)
1392                 {
1393                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn);
1394                 }
1395         }
1396
1397
1398         return tn;
1399 }
1400
1401 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
1402 {
1403
1404         yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
1405         if(obj)
1406         {
1407                 obj->fake = 1;                  // it is fake so it has no NAND presence...
1408                 obj->renameAllowed= 0;  // ... and we're not allowed to rename it...
1409                 obj->unlinkAllowed= 0;  // ... or unlink it
1410                 obj->deleted = 0;
1411                 obj->unlinked = 0;
1412                 obj->st_mode = mode;
1413                 obj->myDev = dev;
1414                 obj->chunkId = 0; // Not a valid chunk.
1415         }
1416
1417         return obj;
1418
1419 }
1420
1421
1422 static void yaffs_UnhashObject(yaffs_Object *tn)
1423 {
1424         int bucket;
1425         yaffs_Device *dev = tn->myDev;
1426
1427
1428         // If it is still linked into the bucket list, free from the list
1429         if(!list_empty(&tn->hashLink))
1430         {
1431                 list_del_init(&tn->hashLink);
1432                 bucket =  yaffs_HashFunction(tn->objectId);
1433                 dev->objectBucket[bucket].count--;
1434         }
1435
1436 }
1437
1438
1439 // FreeObject frees up a Object and puts it back on the free list
1440 static void yaffs_FreeObject(yaffs_Object *tn)
1441 {
1442
1443         yaffs_Device *dev = tn->myDev;
1444
1445         yaffs_UnhashObject(tn);
1446
1447         // Link into the free list.
1448         tn->siblings.next = (struct list_head *)(dev->freeObjects);
1449         dev->freeObjects = tn;
1450         dev->nFreeObjects++;
1451 }
1452
1453
1454
1455
1456 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
1457 {
1458         // Free the list of allocated Objects
1459
1460         yaffs_ObjectList *tmp;
1461
1462         while( dev->allocatedObjectList)
1463         {
1464                 tmp =  dev->allocatedObjectList->next;
1465                 YFREE(dev->allocatedObjectList->objects);
1466                 YFREE(dev->allocatedObjectList);
1467
1468                 dev->allocatedObjectList =  tmp;
1469         }
1470
1471         dev->freeObjects = NULL;
1472         dev->nFreeObjects = 0;
1473 }
1474
1475 static void yaffs_InitialiseObjects(yaffs_Device *dev)
1476 {
1477         int i;
1478
1479         dev->allocatedObjectList = NULL;
1480         dev->freeObjects = NULL;
1481         dev->nFreeObjects = 0;
1482
1483         for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)
1484         {
1485                 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1486                 dev->objectBucket[i].count = 0;
1487         }
1488
1489 }
1490
1491
1492
1493
1494
1495
1496 int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
1497 {
1498         static int x = 0;
1499         int i;
1500         int l = 999;
1501         int lowest = 999999;
1502
1503
1504         // First let's see if we can find one that's empty.
1505
1506         for(i = 0; i < 10 && lowest > 0; i++)
1507          {
1508                 x++;
1509                 x %=  YAFFS_NOBJECT_BUCKETS;
1510                 if(dev->objectBucket[x].count < lowest)
1511                 {
1512                         lowest = dev->objectBucket[x].count;
1513                         l = x;
1514                 }
1515
1516         }
1517
1518         // If we didn't find an empty list, then try
1519         // looking a bit further for a short one
1520
1521         for(i = 0; i < 10 && lowest > 3; i++)
1522          {
1523                 x++;
1524                 x %=  YAFFS_NOBJECT_BUCKETS;
1525                 if(dev->objectBucket[x].count < lowest)
1526                 {
1527                         lowest = dev->objectBucket[x].count;
1528                         l = x;
1529                 }
1530
1531         }
1532
1533         return l;
1534 }
1535
1536 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
1537 {
1538         int bucket = yaffs_FindNiceObjectBucket(dev);
1539
1540         // Now find an object value that has not already been taken
1541         // by scanning the list.
1542
1543         int found = 0;
1544         struct list_head *i;
1545
1546         __u32 n = (__u32)bucket;
1547
1548         //yaffs_CheckObjectHashSanity();
1549
1550         while(!found)
1551         {
1552                 found = 1;
1553                 n +=  YAFFS_NOBJECT_BUCKETS;
1554                 if(1 ||dev->objectBucket[bucket].count > 0)
1555                 {
1556                         list_for_each(i,&dev->objectBucket[bucket].list)
1557                         {
1558                                 // If there is already one in the list
1559                                 if(i && list_entry(i, yaffs_Object,hashLink)->objectId == n)
1560                                 {
1561                                         found = 0;
1562                                 }
1563                         }
1564                 }
1565         }
1566
1567         //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
1568
1569         return n;
1570 }
1571
1572 void yaffs_HashObject(yaffs_Object *in)
1573 {
1574         int bucket = yaffs_HashFunction(in->objectId);
1575         yaffs_Device *dev = in->myDev;
1576
1577         if(!list_empty(&in->hashLink))
1578         {
1579                 //YINFO("!!!");
1580         }
1581
1582
1583         list_add(&in->hashLink,&dev->objectBucket[bucket].list);
1584         dev->objectBucket[bucket].count++;
1585
1586 }
1587
1588 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)
1589 {
1590         int bucket = yaffs_HashFunction(number);
1591         struct list_head *i;
1592         yaffs_Object *in;
1593
1594         list_for_each(i,&dev->objectBucket[bucket].list)
1595         {
1596                 // Look if it is in the list
1597                 if(i)
1598                 {
1599                         in = list_entry(i, yaffs_Object,hashLink);
1600                         if(in->objectId == number)
1601                         {
1602                                 return in;
1603                         }
1604                 }
1605         }
1606
1607         return NULL;
1608 }
1609
1610
1611
1612 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
1613 {
1614
1615         yaffs_Object *theObject;
1616
1617         if(number < 0)
1618         {
1619                 number = yaffs_CreateNewObjectNumber(dev);
1620         }
1621
1622         theObject = yaffs_AllocateEmptyObject(dev);
1623
1624         if(theObject)
1625         {
1626                 theObject->fake = 0;
1627                 theObject->renameAllowed = 1;
1628                 theObject->unlinkAllowed = 1;
1629                 theObject->objectId = number;
1630                 yaffs_HashObject(theObject);
1631                 theObject->variantType = type;
1632 #ifdef CONFIG_YAFFS_WINCE
1633                 yfsd_WinFileTimeNow(theObject->win_atime);
1634                 theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];
1635                 theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];
1636
1637 #else
1638
1639 #if defined(CONFIG_KERNEL_2_5)
1640                 theObject->st_atime = theObject->st_mtime =     theObject->st_ctime = CURRENT_TIME.tv_sec;
1641 #else
1642                 theObject->st_atime = theObject->st_mtime =     theObject->st_ctime = CURRENT_TIME;
1643 #endif
1644 #endif
1645                 switch(type)
1646                 {
1647                         case YAFFS_OBJECT_TYPE_FILE:
1648                                 theObject->variant.fileVariant.fileSize = 0;
1649                                 theObject->variant.fileVariant.scannedFileSize = 0;
1650                                 theObject->variant.fileVariant.topLevel = 0;
1651                                 theObject->variant.fileVariant.top  = yaffs_GetTnode(dev);
1652                                 break;
1653                         case YAFFS_OBJECT_TYPE_DIRECTORY:
1654                                 INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
1655                                 break;
1656                         case YAFFS_OBJECT_TYPE_SYMLINK:
1657                                 // No action required
1658                                 break;
1659                         case YAFFS_OBJECT_TYPE_HARDLINK:
1660                                 // No action required
1661                                 break;
1662                         case YAFFS_OBJECT_TYPE_SPECIAL:
1663                                 // No action required
1664                                 break;
1665                         case YAFFS_OBJECT_TYPE_UNKNOWN:
1666                                 // todo this should not happen
1667                                 break;
1668                 }
1669         }
1670
1671         return theObject;
1672 }
1673
1674 yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)
1675 {
1676         yaffs_Object *theObject = NULL;
1677
1678         if(number > 0)
1679         {
1680                 theObject = yaffs_FindObjectByNumber(dev,number);
1681         }
1682
1683         if(!theObject)
1684         {
1685                 theObject = yaffs_CreateNewObject(dev,number,type);
1686         }
1687
1688         return theObject;
1689
1690 }
1691
1692 char *yaffs_CloneString(const char *str)
1693 {
1694         char *newStr = NULL;
1695
1696         if(str && *str)
1697         {
1698                 newStr = YMALLOC(strlen(str) + 1);
1699                 strcpy(newStr,str);
1700         }
1701
1702         return newStr;
1703
1704 }
1705
1706 //
1707 // Mknod (create) a new object.
1708 // equivalentObject only has meaning for a hard link;
1709 // aliasString only has meaning for a sumlink.
1710 // rdev only has meaning for devices (a subset of special objects)
1711 yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,
1712                                                                  yaffs_Object *parent,
1713                                                                  const char *name,
1714                                                                  __u32 mode,
1715                                                                  __u32 uid,
1716                                                                  __u32 gid,
1717                                                                  yaffs_Object *equivalentObject,
1718                                                                  const char *aliasString,
1719                                                                  __u32 rdev)
1720 {
1721         yaffs_Object *in;
1722
1723         yaffs_Device *dev = parent->myDev;
1724
1725         // Check if the entry exists. If it does then fail the call since we don't want a dup.
1726         if(yaffs_FindObjectByName(parent,name))
1727         {
1728                 return NULL;
1729         }
1730
1731         in = yaffs_CreateNewObject(dev,-1,type);
1732
1733         if(in)
1734         {
1735                 in->chunkId = -1;
1736                 in->valid = 1;
1737                 in->variantType = type;
1738
1739                 in->st_mode  = mode;
1740
1741 #ifdef CONFIG_YAFFS_WINCE
1742                 yfsd_WinFileTimeNow(in->win_atime);
1743                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1744                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[0];
1745
1746 #else
1747 #if defined(CONFIG_KERNEL_2_5)
1748                 in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME.tv_sec;
1749 #else
1750                 in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME;
1751 #endif
1752                 in->st_rdev  = rdev;
1753                 in->st_uid   = uid;
1754                 in->st_gid   = gid;
1755 #endif
1756                 in->nDataChunks = 0;
1757
1758                 yaffs_SetObjectName(in,name);
1759                 in->dirty = 1;
1760
1761                 yaffs_AddObjectToDirectory(parent,in);
1762
1763                 in->myDev = parent->myDev;
1764
1765
1766                 switch(type)
1767                 {
1768                         case YAFFS_OBJECT_TYPE_SYMLINK:
1769                                 in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);
1770                                 break;
1771                         case YAFFS_OBJECT_TYPE_HARDLINK:
1772                                 in->variant.hardLinkVariant.equivalentObject = equivalentObject;
1773                                 in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
1774                                 list_add(&in->hardLinks,&equivalentObject->hardLinks);
1775                                 break;
1776                         case YAFFS_OBJECT_TYPE_FILE: // do nothing
1777                         case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
1778                         case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
1779                         case YAFFS_OBJECT_TYPE_UNKNOWN:
1780                                 break;
1781                 }
1782
1783                 if(/*yaffs_GetNumberOfFreeChunks(dev) <= 0 || */
1784                    yaffs_UpdateObjectHeader(in,name,0) < 0)
1785                 {
1786                         // Could not create the object header, fail the creation
1787                         yaffs_AbortHalfCreatedObject(in);
1788                         in = NULL;
1789                 }
1790
1791         }
1792
1793         return in;
1794 }
1795
1796 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)
1797 {
1798         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0);
1799 }
1800
1801 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)
1802 {
1803         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);
1804 }
1805
1806 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1807 {
1808         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,rdev);
1809 }
1810
1811 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias)
1812 {
1813         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0);
1814 }
1815
1816 // NB yaffs_Link returns the object id of the equivalent object.
1817 yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject)
1818 {
1819         // Get the real object in case we were fed a hard link as an equivalent object
1820         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1821
1822         if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0))
1823         {
1824                 return equivalentObject;
1825         }
1826         else
1827         {
1828                 return NULL;
1829         }
1830
1831 }
1832
1833
1834 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName,int force)
1835 {
1836         int unlinkOp;
1837
1838         if(newDir == NULL)
1839         {
1840                 newDir = obj->parent; // use the old directory
1841         }
1842
1843         unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1844
1845         // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since
1846         // duplicate names are allowed.
1847         // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.
1848         if( (unlinkOp||
1849                  force ||
1850                  !yaffs_FindObjectByName(newDir,newName))  &&
1851              newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1852         {
1853                 yaffs_SetObjectName(obj,newName);
1854                 obj->dirty = 1;
1855
1856                 yaffs_AddObjectToDirectory(newDir,obj);
1857
1858                 if(unlinkOp) obj->unlinked = 1;
1859
1860
1861                 if(yaffs_UpdateObjectHeader(obj,newName,0) >= 0)
1862                 {
1863                         return YAFFS_OK;
1864                 }
1865         }
1866
1867         return YAFFS_FAIL;
1868 }
1869
1870
1871
1872 int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName)
1873 {
1874         yaffs_Object *obj;
1875         int force = 0;
1876
1877 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1878         // Special case for WinCE.
1879         // While look-up is case insensitive, the name isn't.
1880         // THerefore we might want to change x.txt to X.txt
1881         if(oldDir == newDir && _stricmp(oldName,newName) == 0)
1882         {
1883                 force = 1;
1884         }
1885 #endif
1886
1887         obj = yaffs_FindObjectByName(oldDir,oldName);
1888         if(obj && obj->renameAllowed)
1889         {
1890                 return yaffs_ChangeObjectName(obj,newDir,newName,force);
1891         }
1892         return YAFFS_FAIL;
1893 }
1894
1895
1896
1897 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
1898 {
1899         // Scan the buckets and check that the lists
1900         // have as many members as the count says there are
1901         int bucket;
1902         int countEm;
1903         struct list_head *j;
1904         int ok = YAFFS_OK;
1905
1906         for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
1907         {
1908                 countEm = 0;
1909
1910                 list_for_each(j,&dev->objectBucket[bucket].list)
1911                 {
1912                         countEm++;
1913                 }
1914
1915                 if(countEm != dev->objectBucket[bucket].count)
1916                 {
1917                         T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
1918                         ok = YAFFS_FAIL;
1919                 }
1920         }
1921
1922         return ok;
1923 }
1924
1925 #if 0
1926 void yaffs_ObjectTest(yaffs_Device *dev)
1927 {
1928         yaffs_Object *in[1000];
1929         int inNo[1000];
1930         yaffs_Object *inold[1000];
1931         int i;
1932         int j;
1933
1934         memset(in,0,1000*sizeof(yaffs_Object *));
1935         memset(inold,0,1000*sizeof(yaffs_Object *));
1936
1937         yaffs_CheckObjectHashSanity(dev);
1938
1939         for(j = 0; j < 10; j++)
1940         {
1941                 //T(("%d\n",j));
1942
1943                 for(i = 0; i < 1000; i++)
1944                 {
1945                         in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
1946                         if(!in[i])
1947                         {
1948                                 YINFO("No more inodes");
1949                         }
1950                         else
1951                         {
1952                                 inNo[i] = in[i]->objectId;
1953                         }
1954                 }
1955
1956                 for(i = 0; i < 1000; i++)
1957                 {
1958                         if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
1959                         {
1960                                 //T(("Differnce in look up test\n"));
1961                         }
1962                         else
1963                         {
1964                                 // T(("Look up ok\n"));
1965                         }
1966                 }
1967
1968                 yaffs_CheckObjectHashSanity(dev);
1969
1970                 for(i = 0; i < 1000; i+=3)
1971                 {
1972                         yaffs_FreeObject(in[i]);
1973                         in[i] = NULL;
1974                 }
1975
1976
1977                 yaffs_CheckObjectHashSanity(dev);
1978         }
1979
1980 }
1981
1982 #endif
1983
1984 /////////////////////////// Block Management and Page Allocation ///////////////////
1985
1986
1987 static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
1988 {
1989         dev->allocationBlock = -1; // force it to get a new one
1990         //Todo we're assuming the malloc will pass.
1991         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
1992         // Set up dynamic blockinfo stuff.
1993         dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8;
1994         dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
1995         if(dev->blockInfo && dev->chunkBits)
1996         {
1997                 memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));
1998                 memset(dev->chunkBits,0,dev->chunkBitmapStride * nBlocks);
1999                 return YAFFS_OK;
2000         }
2001
2002         return YAFFS_FAIL;
2003
2004 }
2005
2006 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2007 {
2008         YFREE(dev->blockInfo);
2009         dev->blockInfo = NULL;
2010         YFREE(dev->chunkBits);
2011         dev->chunkBits = NULL;
2012 }
2013
2014 // FindDiretiestBlock is used to select the dirtiest block (or close enough)
2015 // for garbage collection.
2016
2017 static int yaffs_FindDirtiestBlock(yaffs_Device *dev,int aggressive)
2018 {
2019
2020         int b = dev->currentDirtyChecker;
2021
2022         int i;
2023         int iterations;
2024         int dirtiest = -1;
2025         int pagesInUse;
2026         yaffs_BlockInfo *bi;
2027
2028         // If we're doing aggressive GC then we are happy to take a less-dirty block, and
2029         // search further.
2030
2031         pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2032         if(aggressive)
2033         {
2034                 iterations = dev->endBlock - dev->startBlock + 1;
2035         }
2036         else
2037         {
2038                 iterations = dev->endBlock - dev->startBlock + 1;
2039                 iterations = iterations / 16;
2040                 if(iterations > 200)
2041                 {
2042                         iterations = 200;
2043                 }
2044         }
2045
2046         for(i = 0; i <= iterations && pagesInUse > 0 ; i++)
2047         {
2048                 b++;
2049                 if ( b < dev->startBlock || b > dev->endBlock)
2050                 {
2051                         b =  dev->startBlock;
2052                 }
2053
2054                 if(b < dev->startBlock || b > dev->endBlock)
2055                 {
2056                         T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));
2057                         YBUG();
2058                 }
2059
2060                 bi = yaffs_GetBlockInfo(dev,b);
2061
2062                 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2063                    (bi->pagesInUse - bi->softDeletions )< pagesInUse)
2064                 {
2065                         dirtiest = b;
2066                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2067                 }
2068         }
2069
2070         dev->currentDirtyChecker = b;
2071
2072         return dirtiest;
2073 }
2074
2075
2076 static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
2077 {
2078         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);
2079
2080         int erasedOk = 0;
2081
2082         // If the block is still healthy erase it and mark as clean.
2083         // If the block has had a data failure, then retire it.
2084         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2085
2086         if(!bi->needsRetiring)
2087         {
2088                 erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
2089                 if(!erasedOk)
2090                 {
2091                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
2092                 }
2093         }
2094
2095         if( erasedOk )
2096         {
2097                 // Clean it up...
2098                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2099                 dev->nErasedBlocks++;
2100                 bi->pagesInUse = 0;
2101                 bi->softDeletions = 0;
2102                 yaffs_ClearChunkBits(dev,blockNo);
2103
2104                 T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
2105         }
2106         else
2107         {
2108                 yaffs_RetireBlock(dev,blockNo);
2109                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));
2110         }
2111 }
2112
2113
2114 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2115 {
2116         int i;
2117
2118         yaffs_BlockInfo *bi;
2119
2120         if(dev->nErasedBlocks < 1)
2121         {
2122                 // Hoosterman we've got a problem.
2123                 // Can't get space to gc
2124                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during gc" TENDSTR)));
2125
2126                 return -1;
2127         }
2128
2129         // Find an empty block.
2130
2131         for(i = dev->startBlock; i <= dev->endBlock; i++)
2132         {
2133                 dev->allocationBlockFinder++;
2134                 if(dev->allocationBlockFinder <dev->startBlock || dev->allocationBlockFinder> dev->endBlock)
2135                 {
2136                         dev->allocationBlockFinder = dev->startBlock;
2137                 }
2138
2139                 bi = yaffs_GetBlockInfo(dev,dev->allocationBlockFinder);
2140
2141                 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
2142                 {
2143                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2144                         dev->nErasedBlocks--;
2145                         return dev->allocationBlockFinder;
2146                 }
2147         }
2148
2149         return -1;
2150 }
2151
2152
2153
2154 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
2155 {
2156         int retVal;
2157         yaffs_BlockInfo *bi;
2158
2159         if(dev->allocationBlock < 0)
2160         {
2161                 // Get next block to allocate off
2162                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2163                 dev->allocationPage = 0;
2164         }
2165
2166         if(!useReserve &&  dev->nErasedBlocks <= dev->nReservedBlocks)
2167         {
2168                 // Not enough space to allocate unless we're allowed to use the reserve.
2169                 return -1;
2170         }
2171
2172         // Next page please....
2173         if(dev->allocationBlock >= 0)
2174         {
2175                 bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);
2176
2177                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2178                                   dev->allocationPage;
2179                 bi->pagesInUse++;
2180                 yaffs_SetChunkBit(dev,dev->allocationBlock,dev->allocationPage);
2181
2182                 dev->allocationPage++;
2183
2184                 dev->nFreeChunks--;
2185
2186                 // If the block is full set the state to full
2187                 if(dev->allocationPage >= dev->nChunksPerBlock)
2188                 {
2189                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2190                         dev->allocationBlock = -1;
2191                 }
2192
2193
2194                 return retVal;
2195
2196         }
2197         T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2198
2199         return -1;
2200 }
2201
2202 // To determine if we have enough space we just look at the
2203 // number of erased blocks.
2204 // The cache is allowed to use reserved blocks.
2205
2206 static int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev)
2207 {
2208         return (dev->nErasedBlocks >= dev->nReservedBlocks);
2209 }
2210
2211
2212 static int  yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)
2213 {
2214         int oldChunk;
2215         int newChunk;
2216         int chunkInBlock;
2217         int markNAND;
2218
2219
2220         yaffs_Spare spare;
2221         yaffs_Tags  tags;
2222         __u8  buffer[YAFFS_BYTES_PER_CHUNK];
2223
2224 //      yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
2225
2226         yaffs_Object *object;
2227
2228         //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
2229
2230         for(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock;
2231             chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block);
2232             chunkInBlock++, oldChunk++ )
2233         {
2234                 if(yaffs_CheckChunkBit(dev,block,chunkInBlock))
2235                 {
2236
2237                         // This page is in use and might need to be copied off
2238
2239                         markNAND = 1;
2240
2241                         //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
2242
2243                         yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare,1);
2244
2245                         yaffs_GetTagsFromSpare(dev,&spare,&tags);
2246
2247                         object = yaffs_FindObjectByNumber(dev,tags.objectId);
2248
2249                         if(object && object->deleted && tags.chunkId != 0)
2250                         {
2251                                 // Data chunk in a deleted file, throw it away
2252                                 // It's a deleted data chunk,
2253                                 // No need to copy this, just forget about it and fix up the
2254                                 // object.
2255
2256                                 //yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
2257                                 object->nDataChunks--;
2258
2259                                 if(object->nDataChunks <= 0)
2260                                 {
2261                                         // Time to delete the file too
2262                                         yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
2263                                         object->variant.fileVariant.top = NULL;
2264                                         T(YAFFS_TRACE_TRACING,(TSTR("yaffs: About to finally delete object %d" TENDSTR),object->objectId));
2265                                         yaffs_DoGenericObjectDeletion(object);
2266                                 }
2267                                 markNAND = 0;
2268                         }
2269                         else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */)
2270                         {
2271                                 // Deleted object header with no data chunks.
2272                                 // Can be discarded and the file deleted.
2273                                 object->chunkId = 0;
2274                                 yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
2275                                 object->variant.fileVariant.top = NULL;
2276                                 yaffs_DoGenericObjectDeletion(object);
2277
2278                         }
2279                         else if(object)
2280                         {
2281                                 // It's either a data chunk in a live file or
2282                                 // an ObjectHeader, so we're interested in it.
2283                                 // NB Need to keep the ObjectHeaders of deleted files
2284                                 // until the whole file has been deleted off
2285                                 tags.serialNumber++;
2286                                 yaffs_LoadTagsIntoSpare(&spare,&tags);
2287
2288                                 dev->nGCCopies++;
2289
2290                                 newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1);
2291
2292                                 if(newChunk < 0)
2293                                 {
2294                                         return YAFFS_FAIL;
2295                                 }
2296
2297                                 // Ok, now fix up the Tnodes etc.
2298
2299                                 if(tags.chunkId == 0)
2300                                 {
2301                                         // It's a header
2302                                         object->chunkId = newChunk;
2303                                 }
2304                                 else
2305                                 {
2306                                         // It's a data chunk
2307                                         yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);
2308                                 }
2309                         }
2310
2311                         yaffs_DeleteChunk(dev,oldChunk,markNAND);
2312
2313                 }
2314         }
2315
2316         return YAFFS_OK;
2317 }
2318
2319
2320 static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
2321 {
2322         // find a file to delete
2323         struct list_head *i;
2324         yaffs_Object *l;
2325
2326
2327         //Scan the unlinked files looking for one to delete
2328         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
2329         {
2330                 if(i)
2331                 {
2332                         l = list_entry(i, yaffs_Object,siblings);
2333                         if(l->deleted)
2334                         {
2335                                 return l;
2336                         }
2337                 }
2338         }
2339         return NULL;
2340 }
2341
2342
2343 static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
2344 {
2345         // This does background deletion on unlinked files.. only deleted ones.
2346         // If we don't have a file we're working on then find one
2347         if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
2348         {
2349                 dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
2350         }
2351
2352         // OK, we're working on a file...
2353         if(dev->unlinkedDeletion)
2354         {
2355                 yaffs_Object *obj = dev->unlinkedDeletion;
2356                 int delresult;
2357                 int limit; // Number of chunks to delete in a file.
2358                                    // NB this can be exceeded, but not by much.
2359
2360                 limit = -1;
2361
2362                 delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
2363
2364                 if(obj->nDataChunks == 0)
2365                 {
2366                         // Done all the deleting of data chunks.
2367                         // Now dump the header and clean up
2368                         yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
2369                         obj->variant.fileVariant.top = NULL;
2370                         yaffs_DoGenericObjectDeletion(obj);
2371                         dev->nDeletedFiles--;
2372                         dev->nUnlinkedFiles--;
2373                         dev->nBackgroundDeletions++;
2374                         dev->unlinkedDeletion = NULL;
2375                 }
2376         }
2377 }
2378
2379
2380 #if 0
2381 #define YAFFS_GARBAGE_COLLECT_LOW_WATER 2
2382 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2383 {
2384         int block;
2385         int aggressive=0;
2386
2387         //yaffs_DoUnlinkedFileDeletion(dev);
2388
2389         if(dev->nErasedBlocks <= (dev->nReservedBlocks + YAFFS_GARBAGE_COLLECT_LOW_WATER))
2390         {
2391                 aggressive = 1;
2392         }
2393
2394         if(aggressive)
2395         {
2396                 block = yaffs_FindDirtiestBlock(dev,aggressive);
2397
2398                 if(block >= 0)
2399                 {
2400                         dev->garbageCollections++;
2401                         return yaffs_GarbageCollectBlock(dev,block);
2402                 }
2403                 else
2404                 {
2405                         return YAFFS_FAIL;
2406                 }
2407         }
2408
2409         return YAFFS_OK;
2410 }
2411 #endif
2412
2413 // New garbage collector
2414 // If we're very low on erased blocks then we do aggressive garbage collection
2415 // otherwise we do "passive" garbage collection.
2416 // Aggressive gc looks further (whole array) and will accept dirtier blocks.
2417 // Passive gc only inspects smaller areas and will only accept cleaner blocks.
2418 //
2419 // The idea is to help clear out space in a more spread-out manner.
2420 // Dunno if it really does anything useful.
2421 //
2422 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2423 {
2424         int block;
2425         int aggressive=0;
2426
2427         //yaffs_DoUnlinkedFileDeletion(dev);
2428
2429         if(dev->nErasedBlocks <= (dev->nReservedBlocks + 1))
2430         {
2431                 aggressive = 1;
2432         }
2433
2434         block = yaffs_FindDirtiestBlock(dev,aggressive);
2435
2436         if(block >= 0)
2437         {
2438                 dev->garbageCollections++;
2439                 if(!aggressive)
2440                 {
2441                         dev->passiveGarbageCollections++;
2442                 }
2443
2444                 T(YAFFS_TRACE_GC,(TSTR("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),dev->nErasedBlocks,aggressive));
2445
2446                 return yaffs_GarbageCollectBlock(dev,block);
2447         }
2448
2449         return aggressive ? YAFFS_FAIL : YAFFS_OK;
2450 }
2451
2452
2453 //////////////////////////// TAGS ///////////////////////////////////////
2454
2455 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
2456 {
2457         yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2458
2459         yaffs_CalcTagsECC(tagsPtr);
2460
2461         sparePtr->tagByte0 = tu->asBytes[0];
2462         sparePtr->tagByte1 = tu->asBytes[1];
2463         sparePtr->tagByte2 = tu->asBytes[2];
2464         sparePtr->tagByte3 = tu->asBytes[3];
2465         sparePtr->tagByte4 = tu->asBytes[4];
2466         sparePtr->tagByte5 = tu->asBytes[5];
2467         sparePtr->tagByte6 = tu->asBytes[6];
2468         sparePtr->tagByte7 = tu->asBytes[7];
2469 }
2470
2471 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
2472 {
2473         yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2474         int result;
2475
2476         tu->asBytes[0]= sparePtr->tagByte0;
2477         tu->asBytes[1]= sparePtr->tagByte1;
2478         tu->asBytes[2]= sparePtr->tagByte2;
2479         tu->asBytes[3]= sparePtr->tagByte3;
2480         tu->asBytes[4]= sparePtr->tagByte4;
2481         tu->asBytes[5]= sparePtr->tagByte5;
2482         tu->asBytes[6]= sparePtr->tagByte6;
2483         tu->asBytes[7]= sparePtr->tagByte7;
2484
2485         result =  yaffs_CheckECCOnTags(tagsPtr);
2486         if(result> 0)
2487         {
2488                 dev->tagsEccFixed++;
2489         }
2490         else if(result <0)
2491         {
2492                 dev->tagsEccUnfixed++;
2493         }
2494 }
2495
2496 static void yaffs_SpareInitialise(yaffs_Spare *spare)
2497 {
2498         memset(spare,0xFF,sizeof(yaffs_Spare));
2499 }
2500
2501 static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted)
2502 {
2503         if(tags)
2504         {
2505                 yaffs_Spare spare;
2506                 if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare,1) == YAFFS_OK)
2507                 {
2508                         *chunkDeleted = (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;
2509                         yaffs_GetTagsFromSpare(dev,&spare,tags);
2510                         return YAFFS_OK;
2511                 }
2512                 else
2513                 {
2514                         return YAFFS_FAIL;
2515                 }
2516         }
2517
2518         return YAFFS_OK;
2519 }
2520
2521 #if 0
2522 static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags)
2523 {
2524         // NB There must be tags, data is optional
2525         // If there is data, then an ECC is calculated on it.
2526
2527         yaffs_Spare spare;
2528
2529         if(!tags)
2530         {
2531                 return YAFFS_FAIL;
2532         }
2533
2534         yaffs_SpareInitialise(&spare);
2535
2536         if(!dev->useNANDECC && buffer)
2537         {
2538                 yaffs_CalcECC(buffer,&spare);
2539         }
2540
2541         yaffs_LoadTagsIntoSpare(&spare,tags);
2542
2543         return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare);
2544
2545 }
2546 #endif
2547
2548
2549 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve)
2550 {
2551         // NB There must be tags, data is optional
2552         // If there is data, then an ECC is calculated on it.
2553
2554         yaffs_Spare spare;
2555
2556         if(!tags)
2557         {
2558                 return YAFFS_FAIL;
2559         }
2560
2561         yaffs_SpareInitialise(&spare);
2562
2563         if(!dev->useNANDECC && buffer)
2564         {
2565                 yaffs_CalcECC(buffer,&spare);
2566         }
2567
2568         yaffs_LoadTagsIntoSpare(&spare,tags);
2569
2570         return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
2571
2572 }
2573
2574 static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted)
2575 {
2576         return  (  tags->chunkId == chunkInObject &&
2577                            tags->objectId == objectId &&
2578                            !chunkDeleted) ? 1 : 0;
2579
2580 }
2581
2582
2583
2584 int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)
2585 {
2586         //Get the Tnode, then get the level 0 offset chunk offset
2587     yaffs_Tnode *tn;
2588     int theChunk = -1;
2589     yaffs_Tags localTags;
2590     int i;
2591     int found = 0;
2592     int chunkDeleted;
2593
2594     yaffs_Device *dev = in->myDev;
2595
2596
2597     if(!tags)
2598     {
2599         // Passed a NULL, so use our own tags space
2600         tags = &localTags;
2601     }
2602
2603     tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2604
2605     if(tn)
2606     {
2607                 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2608
2609                 // Now we need to do the shifting etc and search for it
2610                 for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)
2611                 {
2612                         yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);
2613                         if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))
2614                         {
2615                                 // found it;
2616                                 found = 1;
2617                         }
2618                         else
2619                         {
2620                                 theChunk++;
2621                         }
2622                 }
2623     }
2624     return found ? theChunk : -1;
2625 }
2626
2627 int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)
2628 {
2629         //Get the Tnode, then get the level 0 offset chunk offset
2630     yaffs_Tnode *tn;
2631     int theChunk = -1;
2632     yaffs_Tags localTags;
2633     int i;
2634     int found = 0;
2635     yaffs_Device *dev = in->myDev;
2636     int chunkDeleted;
2637
2638     if(!tags)
2639     {
2640         // Passed a NULL, so use our own tags space
2641         tags = &localTags;
2642     }
2643
2644     tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2645
2646     if(tn)
2647     {
2648
2649                 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2650
2651                 // Now we need to do the shifting etc and search for it
2652                 for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)
2653                 {
2654                         yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);
2655                         if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))
2656                         {
2657                                 // found it;
2658                                 found = 1;
2659                         }
2660                         else
2661                         {
2662                                 theChunk++;
2663                         }
2664                 }
2665
2666                 // Delete the entry in the filestructure
2667                 if(found)
2668                 {
2669                         tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
2670                 }
2671     }
2672     else
2673     {
2674         //T(("No level 0 found for %d\n", chunkInInode));
2675     }
2676
2677     if(!found)
2678     {
2679         //T(("Could not find %d to delete\n",chunkInInode));
2680     }
2681     return found ? theChunk : -1;
2682 }
2683
2684
2685 #ifdef YAFFS_PARANOID
2686
2687 static int yaffs_CheckFileSanity(yaffs_Object *in)
2688 {
2689         int chunk;
2690         int nChunks;
2691         int fSize;
2692         int failed = 0;
2693         int objId;
2694         yaffs_Tnode *tn;
2695     yaffs_Tags localTags;
2696     yaffs_Tags *tags = &localTags;
2697     int theChunk;
2698     int chunkDeleted;
2699
2700
2701         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
2702         {
2703                 //T(("Object not a file\n"));
2704                 return YAFFS_FAIL;
2705         }
2706
2707         objId = in->objectId;
2708         fSize  = in->variant.fileVariant.fileSize;
2709         nChunks = (fSize + in->myDev->nBytesPerChunk -1)/in->myDev->nBytesPerChunk;
2710
2711         for(chunk = 1; chunk <= nChunks; chunk++)
2712         {
2713                 tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
2714
2715                 if(tn)
2716                 {
2717
2718                         theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
2719
2720
2721                                 yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);
2722                                 if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))
2723                                 {
2724                                         // found it;
2725
2726                                 }
2727                                 else
2728                                 {
2729                                         //T(("File problem file [%d,%d] NAND %d  tags[%d,%d]\n",
2730                                         //              objId,chunk,theChunk,tags->chunkId,tags->objectId);
2731
2732                                         failed = 1;
2733
2734                                 }
2735
2736                 }
2737                 else
2738                 {
2739                         //T(("No level 0 found for %d\n", chunk));
2740                 }
2741         }
2742
2743         return failed ? YAFFS_FAIL : YAFFS_OK;
2744 }
2745
2746 #endif
2747
2748 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan)
2749 {
2750         yaffs_Tnode *tn;
2751         yaffs_Device *dev = in->myDev;
2752         int existingChunk;
2753         yaffs_Tags existingTags;
2754         yaffs_Tags newTags;
2755         unsigned existingSerial, newSerial;
2756
2757         int newChunkDeleted;
2758
2759
2760         tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2761         if(!tn)
2762         {
2763                 return YAFFS_FAIL;
2764         }
2765
2766         existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
2767
2768         if(inScan)
2769         {
2770                 // If we're scanning then we need to test for duplicates
2771                 // NB This does not need to be efficient since it should only ever
2772                 // happen when the power fails during a write, then only one
2773                 // chunk should ever be affected.
2774
2775
2776                 if(existingChunk != 0)
2777                 {
2778                         // NB Right now existing chunk will not be real chunkId if the device >= 32MB
2779                         //    thus we have to do a FindChunkInFile to get the real chunk id.
2780                         //
2781                         // We have a duplicate now we need to decide which one to use
2782                         // To do this we get both sets of tags and compare serial numbers.
2783                         yaffs_ReadChunkTagsFromNAND(dev,chunkInNAND, &newTags,&newChunkDeleted);
2784
2785
2786                         // Do a proper find
2787                         existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags);
2788
2789                         if(existingChunk <=0)
2790                         {
2791                                 //Hoosterman - how did this happen?
2792
2793                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: existing chunk < 0 in scan" TENDSTR)));
2794
2795                         }
2796
2797
2798                         // NB The deleted flags should be false, otherwise the chunks will
2799                         // not be loaded during a scan
2800
2801                         newSerial = newTags.serialNumber;
2802                         existingSerial = existingTags.serialNumber;
2803
2804                         if( existingChunk <= 0 ||
2805                             ((existingSerial+1) & 3) == newSerial)
2806                         {
2807                                 // Use new
2808                                 // Delete the old one and drop through to update the tnode
2809                                 yaffs_DeleteChunk(dev,existingChunk,1);
2810                         }
2811                         else
2812                         {
2813                                 // Use existing.
2814                                 // Delete the new one and return early so that the tnode isn't changed
2815                                 yaffs_DeleteChunk(dev,chunkInNAND,1);
2816                                 return YAFFS_OK;
2817                         }
2818                 }
2819
2820         }
2821
2822         if(existingChunk == 0)
2823         {
2824                 in->nDataChunks++;
2825         }
2826
2827         tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
2828
2829         return YAFFS_OK;
2830 }
2831
2832
2833
2834 int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer)
2835 {
2836     int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL);
2837
2838     if(chunkInNAND >= 0)
2839     {
2840                 return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL,1);
2841         }
2842         else
2843         {
2844                 return 0;
2845         }
2846
2847 }
2848
2849
2850 static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND)
2851 {
2852         int block;
2853         int page;
2854         yaffs_Spare spare;
2855         yaffs_BlockInfo *bi;
2856
2857         if(chunkId <= 0) return;
2858
2859         dev->nDeletions++;
2860         block = chunkId / dev->nChunksPerBlock;
2861         page = chunkId % dev->nChunksPerBlock;
2862
2863         if(markNAND)
2864         {
2865                 yaffs_SpareInitialise(&spare);
2866
2867                 spare.pageStatus = 0; // To mark it as deleted.
2868
2869
2870                 yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare);
2871                 yaffs_HandleUpdateChunk(dev,chunkId,&spare);
2872         }
2873         else
2874         {
2875                         dev->nUnmarkedDeletions++;
2876         }
2877
2878         bi = yaffs_GetBlockInfo(dev,block);
2879
2880
2881         // Pull out of the management area.
2882         // If the whole block became dirty, this will kick off an erasure.
2883         if(     bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2884             bi->blockState == YAFFS_BLOCK_STATE_FULL)
2885         {
2886                 dev->nFreeChunks++;
2887
2888                 yaffs_ClearChunkBit(dev,block,page);
2889                 bi->pagesInUse--;
2890
2891                 if(bi->pagesInUse == 0 &&
2892                bi->blockState == YAFFS_BLOCK_STATE_FULL)
2893             {
2894                 yaffs_BlockBecameDirty(dev,block);
2895             }
2896
2897         }
2898         else
2899         {
2900                 // T(("Bad news deleting chunk %d\n",chunkId));
2901         }
2902
2903 }
2904
2905
2906
2907
2908 int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)
2909 {
2910         // Find old chunk Need to do this to get serial number
2911         // Write new one and patch into tree.
2912         // Invalidate old tags.
2913
2914     int prevChunkId;
2915     yaffs_Tags prevTags;
2916
2917     int newChunkId;
2918     yaffs_Tags newTags;
2919
2920     yaffs_Device *dev = in->myDev;
2921
2922         yaffs_CheckGarbageCollection(dev);
2923
2924         // Get the previous chunk at this location in the file if it exists
2925     prevChunkId  = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);
2926
2927     // Set up new tags
2928         newTags.chunkId = chunkInInode;
2929         newTags.objectId = in->objectId;
2930         newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
2931         newTags.byteCount = nBytes;
2932         newTags.unusedStuff = 0xFFFFFFFF;
2933
2934         yaffs_CalcTagsECC(&newTags);
2935
2936         newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve);
2937         if(newChunkId >= 0)
2938         {
2939                 yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0);
2940
2941
2942                 if(prevChunkId >= 0)
2943                 {
2944                         yaffs_DeleteChunk(dev,prevChunkId,1);
2945
2946                 }
2947
2948                 yaffs_CheckFileSanity(in);
2949         }
2950         return newChunkId;
2951
2952
2953
2954
2955
2956 }
2957
2958
2959 // UpdateObjectHeader updates the header on NAND for an object.
2960 // If name is not NULL, then that new name is used.
2961 //
2962 int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force)
2963 {
2964
2965         yaffs_Device *dev = in->myDev;
2966
2967     int prevChunkId;
2968
2969     int newChunkId;
2970     yaffs_Tags newTags;
2971     __u8 bufferNew[YAFFS_BYTES_PER_CHUNK];
2972     __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
2973
2974     yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew;
2975     yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
2976
2977
2978     if(!in->fake || force)
2979     {
2980
2981                 yaffs_CheckGarbageCollection(dev);
2982
2983                 memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK);
2984
2985                 prevChunkId = in->chunkId;
2986
2987                 if(prevChunkId >= 0)
2988                 {
2989                         yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL,1);
2990                 }
2991
2992                 // Header data
2993                 oh->type = in->variantType;
2994
2995                 oh->st_mode = in->st_mode;
2996
2997 #ifdef CONFIG_YAFFS_WINCE
2998                 oh->win_atime[0] = in->win_atime[0];
2999                 oh->win_ctime[0] = in->win_ctime[0];
3000                 oh->win_mtime[0] = in->win_mtime[0];
3001                 oh->win_atime[1] = in->win_atime[1];
3002                 oh->win_ctime[1] = in->win_ctime[1];
3003                 oh->win_mtime[1] = in->win_mtime[1];
3004 #else
3005                 oh->st_uid = in->st_uid;
3006                 oh->st_gid = in->st_gid;
3007                 oh->st_atime = in->st_atime;
3008                 oh->st_mtime = in->st_mtime;
3009                 oh->st_ctime = in->st_ctime;
3010                 oh->st_rdev = in->st_rdev;
3011 #endif
3012                 if(in->parent)
3013                 {
3014                         oh->parentObjectId = in->parent->objectId;
3015                 }
3016                 else
3017                 {
3018                         oh->parentObjectId = 0;
3019                 }
3020
3021                 //oh->sum = in->sum;
3022                 if(name && *name)
3023                 {
3024                         memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);
3025                         strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
3026                 }
3027                 else if(prevChunkId)
3028                 {
3029                         memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1);
3030                 }
3031                 else
3032                 {
3033                         memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);
3034                 }
3035
3036                 switch(in->variantType)
3037                 {
3038                         case YAFFS_OBJECT_TYPE_UNKNOWN:
3039                                 // Should not happen
3040                                 break;
3041                         case YAFFS_OBJECT_TYPE_FILE:
3042                                 oh->fileSize = in->variant.fileVariant.fileSize;
3043                                 break;
3044                         case YAFFS_OBJECT_TYPE_HARDLINK:
3045                                 oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId;
3046                                 break;
3047                         case YAFFS_OBJECT_TYPE_SPECIAL:
3048                                 // Do nothing
3049                                 break;
3050                         case YAFFS_OBJECT_TYPE_DIRECTORY:
3051                                 // Do nothing
3052                                 break;
3053                         case YAFFS_OBJECT_TYPE_SYMLINK:
3054                                 strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
3055                                 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3056                                 break;
3057                 }
3058
3059                 // Tags
3060                 in->serial++;
3061                 newTags.chunkId = 0;
3062                 newTags.objectId = in->objectId;
3063                 newTags.serialNumber = in->serial;
3064                 newTags.byteCount =   0xFFFFFFFF;
3065                 newTags.unusedStuff = 0xFFFFFFFF;
3066
3067                 yaffs_CalcTagsECC(&newTags);
3068
3069
3070                 // Create new chunk in NAND
3071                 newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags, (prevChunkId >= 0) ? 1 : 0 );
3072
3073                 if(newChunkId >= 0)
3074                 {
3075
3076                         in->chunkId = newChunkId;
3077
3078                         if(prevChunkId >= 0)
3079                         {
3080                                 yaffs_DeleteChunk(dev,prevChunkId,1);
3081                         }
3082
3083                         in->dirty = 0;
3084                 }
3085
3086                 return newChunkId;
3087
3088     }
3089     return 0;
3090 }
3091
3092
3093 /////////////////////// Short Operations Cache ////////////////////////////////
3094 //      In many siturations where there is no high level buffering (eg WinCE) a lot of
3095 //      reads might be short sequential reads, and a lot of writes may be short
3096 //  sequential writes. eg. scanning/writing a jpeg file.
3097 //      In these cases, a short read/write cache can provide a huge perfomance benefit
3098 //  with dumb-as-a-rock code.
3099 //  There are a limited number (~10) of cache chunks per device so that we don't
3100 //  need a very intelligent search.
3101
3102
3103
3104
3105
3106 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3107 {
3108         yaffs_Device *dev = obj->myDev;
3109         int lowest;
3110         int i;
3111         yaffs_ChunkCache *cache;
3112         int chunkWritten;
3113         int nBytes;
3114         int nCaches = obj->myDev->nShortOpCaches;
3115
3116         if  (nCaches > 0)
3117         {
3118                 do{
3119                         cache = NULL;
3120
3121                         // Find the dirty cache for this object with the lowest chunk id.
3122                         for(i = 0; i < nCaches; i++)
3123                         {
3124                                 if(dev->srCache[i].object == obj &&
3125                                 dev->srCache[i].dirty)
3126                                 {
3127                                         if(!cache ||  dev->srCache[i].chunkId < lowest)
3128                                         {
3129                                                 cache = &dev->srCache[i];
3130                                                 lowest = cache->chunkId;
3131                                         }
3132                                 }
3133                         }
3134
3135                         if(cache)
3136                         {
3137                                 //Write it out
3138
3139 #if 0
3140                                 nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
3141
3142                                 if(nBytes > YAFFS_BYTES_PER_CHUNK)
3143                                 {
3144                                         nBytes= YAFFS_BYTES_PER_CHUNK;
3145                                 }
3146 #endif
3147                                 chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
3148                                                                                                                         cache->chunkId,
3149                                                                                                                         cache->data,
3150                                                                                                                         cache->nBytes,1);
3151
3152                                 cache->dirty = 0;
3153                                 cache->object = NULL;
3154                         }
3155
3156                 } while(cache && chunkWritten > 0);
3157
3158                 if(cache)
3159                 {
3160                         //Hoosterman, disk full while writing cache out.
3161                         T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3162
3163                 }
3164         }
3165
3166 }
3167
3168
3169 // Grab us a chunk for use.
3170 // First look for an empty one.
3171 // Then look for the least recently used non-dirty one.
3172 // Then look for the least recently used dirty one...., flush and look again.
3173 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3174 {
3175         int i;
3176         int usage;
3177         int theOne;
3178
3179         if(dev->nShortOpCaches > 0)
3180         {
3181                 for(i = 0; i < dev->nShortOpCaches; i++)
3182                 {
3183                         if(!dev->srCache[i].object)
3184                         {
3185                                 //T(("Grabbing empty %d\n",i));
3186
3187                                 //printf("Grabbing empty %d\n",i);
3188
3189                                 return &dev->srCache[i];
3190                         }
3191                 }
3192
3193                 return NULL;
3194
3195                 theOne = -1;
3196                 usage = 0; // just to stop the compiler grizzling
3197
3198                 for(i = 0; i < dev->nShortOpCaches; i++)
3199                 {
3200                         if(!dev->srCache[i].dirty &&
3201                         ((dev->srCache[i].lastUse < usage  && theOne >= 0)||
3202                                 theOne < 0))
3203                         {
3204                                 usage = dev->srCache[i].lastUse;
3205                                 theOne = i;
3206                         }
3207                 }
3208
3209                 //T(("Grabbing non-empty %d\n",theOne));
3210
3211                 //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne);
3212
3213                 return  theOne >= 0 ?  &dev->srCache[theOne] : NULL;
3214         }
3215         else
3216         {
3217                 return NULL;
3218         }
3219
3220 }
3221
3222
3223 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3224 {
3225         yaffs_ChunkCache *cache;
3226         yaffs_Object *theObj;
3227         int usage;
3228         int i;
3229         int pushout;
3230
3231         if(dev->nShortOpCaches > 0)
3232         {
3233                 // Try find a non-dirty one...
3234
3235                 cache = yaffs_GrabChunkCacheWorker(dev);
3236
3237                 if(!cache)
3238                 {
3239                         // They were all dirty, find the last recently used object and flush
3240                         // its cache, then  find again.
3241                         // NB what's here is not very accurate, we actually flush the object
3242                         // the last recently used page.
3243
3244                         theObj = dev->srCache[0].object;
3245                         usage = dev->srCache[0].lastUse;
3246                         cache = &dev->srCache[0];
3247                         pushout = 0;
3248
3249                         for(i = 1; i < dev->nShortOpCaches; i++)
3250                         {
3251                                 if( dev->srCache[i].object &&
3252                                         dev->srCache[i].lastUse < usage)
3253                                 {
3254                                         usage  = dev->srCache[i].lastUse;
3255                                         theObj = dev->srCache[i].object;
3256                                         cache = &dev->srCache[i];
3257                                         pushout = i;
3258                                 }
3259                         }
3260
3261                         if(!cache || cache->dirty)
3262                         {
3263
3264                                 //printf("Dirty ");
3265                                 yaffs_FlushFilesChunkCache(theObj);
3266
3267                                 // Try again
3268                                 cache = yaffs_GrabChunkCacheWorker(dev);
3269                         }
3270                         else
3271                         {
3272                                 //printf(" pushout %d\n",pushout);
3273                         }
3274
3275                 }
3276
3277                 return cache;
3278         }
3279         else
3280                 return NULL;
3281
3282 }
3283
3284
3285 // Find a cached chunk
3286 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)
3287 {
3288         yaffs_Device *dev = obj->myDev;
3289         int i;
3290         if(dev->nShortOpCaches > 0)
3291         {
3292                 for(i = 0; i < dev->nShortOpCaches; i++)
3293                 {
3294                         if(dev->srCache[i].object == obj &&
3295                         dev->srCache[i].chunkId == chunkId)
3296                         {
3297                                 dev->cacheHits++;
3298
3299                                 return &dev->srCache[i];
3300                         }
3301                 }
3302         }
3303         return NULL;
3304 }
3305
3306 // Mark the chunk for the least recently used algorithym
3307 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)
3308 {
3309
3310         if(dev->nShortOpCaches > 0)
3311         {
3312                 if( dev->srLastUse < 0 ||
3313                         dev->srLastUse > 100000000)
3314                 {
3315                         // Reset the cache usages
3316                         int i;
3317                         for(i = 1; i < dev->nShortOpCaches; i++)
3318                         {
3319                                 dev->srCache[i].lastUse = 0;
3320                         }
3321                         dev->srLastUse = 0;
3322                 }
3323
3324                 dev->srLastUse++;
3325
3326                 cache->lastUse = dev->srLastUse;
3327
3328                 if(isAWrite)
3329                 {
3330                         cache->dirty = 1;
3331                 }
3332         }
3333 }
3334
3335 // Invalidate a single cache page.
3336 // Do this when a whole page gets written,
3337 // ie the short cache for this page is no longer valid.
3338 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
3339 {
3340         if(object->myDev->nShortOpCaches > 0)
3341         {
3342                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);
3343
3344                 if(cache)
3345                 {
3346                         cache->object = NULL;
3347                 }
3348         }
3349 }
3350
3351
3352 // Invalidate all the cache pages associated with this object
3353 // Do this whenever ther file is deleted or resized.
3354 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
3355 {
3356         int i;
3357         yaffs_Device *dev = in->myDev;
3358
3359         if(dev->nShortOpCaches > 0)
3360         {
3361                 // Now invalidate it.
3362                 for(i = 0; i < dev->nShortOpCaches; i++)
3363                 {
3364                         if(dev->srCache[i].object == in)
3365                         {
3366                                 dev->srCache[i].object = NULL;
3367                         }
3368                 }
3369         }
3370 }
3371
3372
3373
3374
3375
3376 ///////////////////////// File read/write ///////////////////////////////
3377 // Read and write have very similar structures.
3378 // In general the read/write has three parts to it
3379 // * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3380 // * Some complete chunks
3381 // * An incomplete chunk to end off with
3382 //
3383 // Curve-balls: the first chunk might also be the last chunk.
3384
3385 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)
3386 {
3387
3388
3389         int chunk;
3390         int start;
3391         int nToCopy;
3392         int n = nBytes;
3393         int nDone = 0;
3394         yaffs_ChunkCache *cache;
3395
3396         yaffs_Device *dev;
3397
3398         dev = in->myDev;
3399
3400         while(n > 0)
3401         {
3402                 chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1
3403                 start = offset % YAFFS_BYTES_PER_CHUNK;
3404
3405                 // OK now check for the curveball where the start and end are in
3406                 // the same chunk.
3407                 if(     (start + n) < YAFFS_BYTES_PER_CHUNK)
3408                 {
3409                         nToCopy = n;
3410                 }
3411                 else
3412                 {
3413                         nToCopy = YAFFS_BYTES_PER_CHUNK - start;
3414                 }
3415
3416                 cache = yaffs_FindChunkCache(in,chunk);
3417
3418                 // If the chunk is already in the cache or it is less than a whole chunk
3419                 // then use the cache (if there is caching)
3420                 // else bypass the cache.
3421                 if( cache || nToCopy != YAFFS_BYTES_PER_CHUNK)
3422                 {
3423                         if(dev->nShortOpCaches > 0)
3424                         {
3425
3426                                 // If we can't find the data in the cache, then load it up.
3427
3428                                 if(!cache)
3429                                 {
3430                                         cache = yaffs_GrabChunkCache(in->myDev);
3431                                         cache->object = in;
3432                                         cache->chunkId = chunk;
3433                                         cache->dirty = 0;
3434                                         yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3435                                         cache->nBytes = 0;
3436                                 }
3437
3438                                 yaffs_UseChunkCache(dev,cache,0);
3439
3440                                 memcpy(buffer,&cache->data[start],nToCopy);
3441                         }
3442                         else
3443                         {
3444                                 // Read into the local buffer then copy...
3445                                 yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3446                                 memcpy(buffer,&dev->localBuffer[start],nToCopy);
3447                         }
3448
3449                 }
3450                 else
3451                 {
3452 #ifdef CONFIG_YAFFS_WINCE
3453
3454                         // Under WinCE can't do direct transfer. Need to use a local buffer.
3455                         // This is because we otherwise screw up WinCE's memory mapper
3456                         yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3457                         memcpy(buffer,dev->localBuffer,YAFFS_BYTES_PER_CHUNK);
3458 #else
3459                         // A full chunk. Read directly into the supplied buffer.
3460                         yaffs_ReadChunkDataFromObject(in,chunk,buffer);
3461 #endif
3462                 }
3463
3464                 n -= nToCopy;
3465                 offset += nToCopy;
3466                 buffer += nToCopy;
3467                 nDone += nToCopy;
3468
3469         }
3470
3471         return nDone;
3472 }
3473
3474
3475
3476 int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes)
3477 {
3478
3479         int chunk;
3480         int start;
3481         int nToCopy;
3482         int n = nBytes;
3483         int nDone = 0;
3484         int nToWriteBack;
3485         int startOfWrite = offset;
3486         int chunkWritten = 0;
3487         int nBytesRead;
3488
3489         yaffs_Device *dev;
3490
3491         dev = in->myDev;
3492
3493
3494         while(n > 0 && chunkWritten >= 0)
3495         {
3496                 chunk = offset / YAFFS_BYTES_PER_CHUNK + 1;
3497                 start = offset % YAFFS_BYTES_PER_CHUNK;
3498
3499
3500                 // OK now check for the curveball where the start and end are in
3501                 // the same chunk.
3502
3503                 if(     (start + n) < YAFFS_BYTES_PER_CHUNK)
3504                 {
3505                         nToCopy = n;
3506
3507                         // Now folks, to calculate how many bytes to write back....
3508                         // If we're overwriting and not writing to then end of file then
3509                         // we need to write back as much as was there before.
3510
3511                         nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * YAFFS_BYTES_PER_CHUNK);
3512
3513                         if(nBytesRead > YAFFS_BYTES_PER_CHUNK)
3514                         {
3515                                 nBytesRead = YAFFS_BYTES_PER_CHUNK;
3516                         }
3517
3518                         nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
3519
3520                 }
3521                 else
3522                 {
3523                         nToCopy = YAFFS_BYTES_PER_CHUNK - start;
3524                         nToWriteBack = YAFFS_BYTES_PER_CHUNK;
3525                 }
3526
3527                 if(nToCopy != YAFFS_BYTES_PER_CHUNK)
3528                 {
3529                         // An incomplete start or end chunk (or maybe both start and end chunk)
3530                         if(dev->nShortOpCaches > 0)
3531                         {
3532                                 yaffs_ChunkCache *cache;
3533                                 // If we can't find the data in the cache, then load it up.
3534                                 cache = yaffs_FindChunkCache(in,chunk);
3535                                 if(!cache && yaffs_CheckSpaceForChunkCache(in->myDev))
3536                                 {
3537                                         cache = yaffs_GrabChunkCache(in->myDev);
3538                                         cache->object = in;
3539                                         cache->chunkId = chunk;
3540                                         cache->dirty = 0;
3541                                         yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3542                                 }
3543
3544                                 if(cache)
3545                                 {
3546                                         yaffs_UseChunkCache(dev,cache,1);
3547                                         memcpy(&cache->data[start],buffer,nToCopy);
3548                                         cache->nBytes = nToWriteBack;
3549                                 }
3550                                 else
3551                                 {
3552                                         chunkWritten = -1; // fail the write
3553                                 }
3554                         }
3555                         else
3556                         {
3557                                 // An incomplete start or end chunk (or maybe both start and end chunk)
3558                                 // Read into the local buffer then copy, then copy over and write back.
3559
3560                                 yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3561
3562                                 memcpy(&dev->localBuffer[start],buffer,nToCopy);
3563
3564                                 chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,nToWriteBack,0);
3565
3566                                 //T(("Write with readback to chunk %d %d  start %d  copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
3567                         }
3568
3569                 }
3570                 else
3571                 {
3572
3573 #ifdef CONFIG_YAFFS_WINCE
3574                         // Under WinCE can't do direct transfer. Need to use a local buffer.
3575                         // This is because we otherwise screw up WinCE's memory mapper
3576                         memcpy(dev->localBuffer,buffer,YAFFS_BYTES_PER_CHUNK);
3577                         chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,YAFFS_BYTES_PER_CHUNK,0);
3578 #else
3579                         // A full chunk. Write directly from the supplied buffer.
3580                         chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0);
3581 #endif
3582                         // Since we've overwritten the cached data, we better invalidate it.
3583                         yaffs_InvalidateChunkCache(in,chunk);
3584                         //T(("Write to chunk %d %d\n",chunk,chunkWritten));
3585                 }
3586
3587                 if(chunkWritten >= 0)
3588                 {
3589                         n -= nToCopy;
3590                         offset += nToCopy;
3591                         buffer += nToCopy;
3592                         nDone += nToCopy;
3593                 }
3594
3595         }
3596
3597         // Update file object
3598
3599         if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
3600         {
3601                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3602         }
3603
3604         in->dirty = 1;
3605
3606         return nDone;
3607 }
3608
3609
3610 int yaffs_ResizeFile(yaffs_Object *in, int newSize)
3611 {
3612         int i;
3613         int chunkId;
3614         int oldFileSize = in->variant.fileVariant.fileSize;
3615         int sizeOfPartialChunk = newSize % YAFFS_BYTES_PER_CHUNK;
3616
3617         yaffs_Device *dev = in->myDev;
3618
3619
3620         yaffs_FlushFilesChunkCache(in);
3621         yaffs_InvalidateWholeChunkCache(in);
3622
3623         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
3624         {
3625                 return yaffs_GetFileSize(in);
3626         }
3627
3628         if(newSize < oldFileSize)
3629         {
3630
3631                 int lastDel = 1 + (oldFileSize-1)/YAFFS_BYTES_PER_CHUNK;
3632
3633                 int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/
3634                                                         YAFFS_BYTES_PER_CHUNK;
3635
3636                 // Delete backwards so that we don't end up with holes if
3637                 // power is lost part-way through the operation.
3638                 for(i = lastDel; i >= startDel; i--)
3639                 {
3640                         // NB this could be optimised somewhat,
3641                         // eg. could retrieve the tags and write them without
3642                         // using yaffs_DeleteChunk
3643
3644                         chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);
3645                         if(chunkId < (dev->startBlock * 32) || chunkId >= ((dev->endBlock+1) * 32))
3646                         {
3647                                 //T(("Found daft chunkId %d for %d\n",chunkId,i));
3648                         }
3649                         else
3650                         {
3651                                 in->nDataChunks--;
3652                                 yaffs_DeleteChunk(dev,chunkId,1);
3653                         }
3654                 }
3655
3656
3657                 if(sizeOfPartialChunk != 0)
3658                 {
3659                         int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK;
3660
3661                         // Got to read and rewrite the last chunk with its new size.
3662                         yaffs_ReadChunkDataFromObject(in,lastChunk,dev->localBuffer);
3663
3664                         yaffs_WriteChunkDataToObject(in,lastChunk,dev->localBuffer,sizeOfPartialChunk,1);
3665
3666                 }
3667
3668                 in->variant.fileVariant.fileSize = newSize;
3669
3670                 yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
3671
3672                 return newSize;
3673
3674         }
3675         else
3676         {
3677                 return oldFileSize;
3678         }
3679 }
3680
3681
3682 loff_t yaffs_GetFileSize(yaffs_Object *obj)
3683 {
3684         obj = yaffs_GetEquivalentObject(obj);
3685
3686         switch(obj->variantType)
3687         {
3688                 case YAFFS_OBJECT_TYPE_FILE:
3689                         return obj->variant.fileVariant.fileSize;
3690                 case YAFFS_OBJECT_TYPE_SYMLINK:
3691                         return strlen(obj->variant.symLinkVariant.alias);
3692                 default:
3693                         return 0;
3694         }
3695 }
3696
3697
3698
3699 // yaffs_FlushFile() updates the file's
3700 // objectId in NAND
3701
3702 int yaffs_FlushFile(yaffs_Object *in, int updateTime)
3703 {
3704         int retVal;
3705         if(in->dirty)
3706         {
3707                 //T(("flushing object header\n"));
3708
3709                 yaffs_FlushFilesChunkCache(in);
3710                 if(updateTime)
3711                 {
3712 #ifdef CONFIG_YAFFS_WINCE
3713                         yfsd_WinFileTimeNow(in->win_mtime);
3714 #else
3715 #if defined(CONFIG_KERNEL_2_5)
3716                         in->st_mtime = CURRENT_TIME.tv_sec;
3717 #else
3718                         in->st_mtime = CURRENT_TIME;
3719 #endif
3720 #endif
3721                 }
3722
3723                 retVal = (yaffs_UpdateObjectHeader(in,NULL,0) >= 0)? YAFFS_OK : YAFFS_FAIL;
3724         }
3725         else
3726         {
3727                 retVal = YAFFS_OK;
3728         }
3729
3730         return retVal;
3731
3732 }
3733
3734
3735 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
3736 {
3737
3738         // First off, invalidate the file's data in the cache, without flushing.
3739         yaffs_InvalidateWholeChunkCache(in);
3740
3741         yaffs_RemoveObjectFromDirectory(in);
3742         yaffs_DeleteChunk(in->myDev,in->chunkId,1);
3743 #ifdef __KERNEL__
3744         if(in->myInode)
3745         {
3746                 in->myInode->u.generic_ip = NULL;
3747                 in->myInode = 0;
3748         }
3749 #endif
3750         yaffs_FreeObject(in);
3751         return YAFFS_OK;
3752
3753 }
3754
3755 // yaffs_DeleteFile deletes the whole file data
3756 // and the inode associated with the file.
3757 // It does not delete the links associated with the file.
3758 static int yaffs_UnlinkFile(yaffs_Object *in)
3759 {
3760
3761 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
3762
3763         // Delete the file data & tnodes
3764
3765          yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
3766
3767
3768         yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
3769
3770         return  yaffs_DoGenericObjectDeletion(in);
3771 #else
3772         int retVal;
3773         int immediateDeletion=0;
3774         retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0);
3775         if(1 || // Ignore the result of the change name. This will only fail
3776                         // if the disk was completely full (an error condition)
3777                         // We ignore the error so we can delete files to recover the disk
3778            retVal == YAFFS_OK)
3779         {
3780                 //in->unlinked = 1;
3781                 //in->myDev->nUnlinkedFiles++;
3782                 //in->renameAllowed = 0;
3783 #ifdef __KERNEL__
3784                 if(!in->myInode)
3785                 {
3786                         immediateDeletion = 1;
3787
3788                 }
3789 #else
3790                 if(in->inUse <= 0)
3791                 {
3792                         immediateDeletion = 1;
3793
3794                 }
3795 #endif
3796
3797                 if(immediateDeletion)
3798                 {
3799                         T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
3800                         in->deleted=1;
3801                         in->myDev->nDeletedFiles++;
3802                         yaffs_SoftDeleteFile(in);
3803                 }
3804
3805         }
3806         return retVal;
3807
3808
3809 #endif
3810 }
3811
3812 int yaffs_DeleteFile(yaffs_Object *in)
3813 {
3814         int retVal = YAFFS_OK;
3815
3816         if(in->nDataChunks > 0)
3817         {
3818                 // Use soft deletion
3819                 if(!in->unlinked)
3820                 {
3821                         retVal = yaffs_UnlinkFile(in);
3822                 }
3823                 if(retVal == YAFFS_OK &&
3824                 in->unlinked &&
3825                 !in->deleted)
3826                 {
3827                         in->deleted = 1;
3828                         in->myDev->nDeletedFiles++;
3829                         yaffs_SoftDeleteFile(in);
3830                 }
3831                 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
3832         }
3833         else
3834         {
3835                 // The file has no data chunks so we toss it immediately
3836                 yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
3837                 in->variant.fileVariant.top = NULL;
3838                 yaffs_DoGenericObjectDeletion(in);
3839
3840                 return YAFFS_OK;
3841         }
3842 }
3843
3844 static int yaffs_DeleteDirectory(yaffs_Object *in)
3845 {
3846         //First check that the directory is empty.
3847         if(list_empty(&in->variant.directoryVariant.children))
3848         {
3849                 return  yaffs_DoGenericObjectDeletion(in);
3850         }
3851
3852         return YAFFS_FAIL;
3853
3854 }
3855
3856 static int yaffs_DeleteSymLink(yaffs_Object *in)
3857 {
3858         YFREE(in->variant.symLinkVariant.alias);
3859
3860         return  yaffs_DoGenericObjectDeletion(in);
3861 }
3862
3863 static int yaffs_DeleteHardLink(yaffs_Object *in)
3864 {
3865         // remove this hardlink from the list assocaited with the equivalent
3866         // object
3867         list_del(&in->hardLinks);
3868         return  yaffs_DoGenericObjectDeletion(in);
3869 }
3870
3871
3872 static void yaffs_AbortHalfCreatedObject(yaffs_Object *obj)
3873 {
3874         switch(obj->variantType)
3875         {
3876                 case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break;
3877                 case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break;
3878                 case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break;
3879                 case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break;
3880                 case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break;
3881                 case YAFFS_OBJECT_TYPE_UNKNOWN: break; // should not happen.
3882         }
3883 }
3884
3885
3886 static int yaffs_UnlinkWorker(yaffs_Object *obj)
3887 {
3888
3889
3890         if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3891         {
3892                 return  yaffs_DeleteHardLink(obj);
3893         }
3894         else if(!list_empty(&obj->hardLinks))
3895         {
3896                 // Curve ball: We're unlinking an object that has a hardlink.
3897                 //
3898                 //      This problem arises because we are not strictly following
3899                 //  The Linux link/inode model.
3900                 //
3901                 // We can't really delete the object.
3902                 // Instead, we do the following:
3903                 // - Select a hardlink.
3904                 // - Unhook it from the hard links
3905                 // - Unhook it from its parent directory (so that the rename can work)
3906                 // - Rename the object to the hardlink's name.
3907                 // - Delete the hardlink
3908
3909
3910                 yaffs_Object *hl;
3911                 int retVal;
3912                 char name[YAFFS_MAX_NAME_LENGTH+1];
3913
3914                 hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);
3915
3916                 list_del_init(&hl->hardLinks);
3917                 list_del_init(&hl->siblings);
3918
3919                 yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);
3920
3921                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0);
3922
3923                 if(retVal == YAFFS_OK)
3924                 {
3925                         retVal = yaffs_DoGenericObjectDeletion(hl);
3926                 }
3927                 return retVal;
3928
3929         }
3930         else
3931         {
3932                 switch(obj->variantType)
3933                 {
3934                         case YAFFS_OBJECT_TYPE_FILE:
3935                                 return yaffs_UnlinkFile(obj);
3936                                 break;
3937                         case YAFFS_OBJECT_TYPE_DIRECTORY:
3938                                 return yaffs_DeleteDirectory(obj);
3939                                 break;
3940                         case YAFFS_OBJECT_TYPE_SYMLINK:
3941                                 return yaffs_DeleteSymLink(obj);
3942                                 break;
3943                         case YAFFS_OBJECT_TYPE_HARDLINK:
3944                         case YAFFS_OBJECT_TYPE_UNKNOWN:
3945                         default:
3946                                 return YAFFS_FAIL;
3947                 }
3948         }
3949 }
3950
3951 int yaffs_Unlink(yaffs_Object *dir, const char *name)
3952 {
3953         yaffs_Object *obj;
3954
3955          obj = yaffs_FindObjectByName(dir,name);
3956
3957          if(obj && obj->unlinkAllowed)
3958          {
3959                 return yaffs_UnlinkWorker(obj);
3960          }
3961
3962          return YAFFS_FAIL;
3963
3964 }
3965
3966 //////////////// Initialisation Scanning /////////////////
3967
3968
3969
3970 // For now we use the SmartMedia check.
3971 // We look at the blockStatus byte in the first two chunks
3972 // These must be 0xFF to pass as OK.
3973 // todo: this function needs to be modifyable foir different NAND types
3974 // and different chunk sizes.  Suggest make this into a per-device configurable
3975 // function.
3976 static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
3977 {
3978         yaffs_Spare spare;
3979
3980         yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock,NULL,&spare,1);
3981 #if 1
3982         if(yaffs_CountBits(spare.blockStatus) < 7)
3983         {
3984                 return 1;
3985         }
3986 #else
3987         if(spare.blockStatus != 0xFF)
3988         {
3989                 return 1;
3990         }
3991 #endif
3992         yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock + 1,NULL,&spare,1);
3993
3994 #if 1
3995         if(yaffs_CountBits(spare.blockStatus) < 7)
3996         {
3997                 return 1;
3998         }
3999 #else
4000         if(spare.blockStatus != 0xFF)
4001         {
4002                 return 1;
4003         }
4004 #endif
4005
4006         return 0;
4007
4008 }
4009
4010 static int yaffs_Scan(yaffs_Device *dev)
4011 {
4012         yaffs_Spare spare;
4013         yaffs_Tags tags;
4014         int blk;
4015         int chunk;
4016         int c;
4017         int deleted;
4018         yaffs_BlockState state;
4019         yaffs_Object *hardList = NULL;
4020         yaffs_Object *hl;
4021         yaffs_BlockInfo *bi;
4022
4023
4024         yaffs_ObjectHeader *oh;
4025         yaffs_Object *in;
4026         yaffs_Object *parent;
4027
4028         __u8 chunkData[YAFFS_BYTES_PER_CHUNK];
4029
4030
4031         // Scan all the blocks...
4032
4033         for(blk = dev->startBlock; blk <= dev->endBlock; blk++)
4034         {
4035                 deleted = 0;
4036                 bi = yaffs_GetBlockInfo(dev,blk);
4037                 yaffs_ClearChunkBits(dev,blk);
4038                 bi->pagesInUse = 0;
4039                 bi->softDeletions = 0;
4040                 state = YAFFS_BLOCK_STATE_SCANNING;
4041
4042
4043                 if(yaffs_IsBlockBad(dev,blk))
4044                 {
4045                         state = YAFFS_BLOCK_STATE_DEAD;
4046                         T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
4047                 }
4048
4049                 // Read each chunk in the block.
4050
4051                 for(c = 0; c < dev->nChunksPerBlock &&
4052                                    state == YAFFS_BLOCK_STATE_SCANNING; c++)
4053                 {
4054                         // Read the spare area and decide what to do
4055                         chunk = blk * dev->nChunksPerBlock + c;
4056
4057                         yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare,1);
4058
4059
4060                         // This block looks ok, now what's in this chunk?
4061                         yaffs_GetTagsFromSpare(dev,&spare,&tags);
4062
4063                         if(yaffs_CountBits(spare.pageStatus) < 6)
4064                         {
4065                                 // A deleted chunk
4066                                 deleted++;
4067                                 dev->nFreeChunks ++;
4068                                 //T((" %d %d deleted\n",blk,c));
4069                         }
4070                         else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID)
4071                         {
4072                                 // An unassigned chunk in the block
4073                                 // This means that either the block is empty or
4074                                 // this is the one being allocated from
4075
4076                                 if(c == 0)
4077                                 {
4078                                         // the block is unused
4079                                         state = YAFFS_BLOCK_STATE_EMPTY;
4080                                         dev->nErasedBlocks++;
4081                                 }
4082                                 else
4083                                 {
4084                                         // this is the block being allocated from
4085                                         T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
4086                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
4087                                         dev->allocationBlock = blk;
4088                                         dev->allocationPage = c;
4089                                 }
4090
4091                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4092                         }
4093                         else if(tags.chunkId > 0)
4094                         {
4095                                 int endpos;
4096                                 // A data chunk.
4097                                 yaffs_SetChunkBit(dev,blk,c);
4098                                 bi->pagesInUse++;
4099
4100                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
4101                                 // PutChunkIntoFIle checks for a clash (two data chunks with
4102                                 // the same chunkId).
4103                                 yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
4104                                 endpos = (tags.chunkId - 1)* YAFFS_BYTES_PER_CHUNK + tags.byteCount;
4105                                 if(in->variant.fileVariant.scannedFileSize <endpos)
4106                                 {
4107                                         in->variant.fileVariant.scannedFileSize = endpos;
4108 #ifndef CONFIG_YAFFS_USE_HEADER_FILE_SIZE
4109                                                 in->variant.fileVariant.fileSize =
4110                                                         in->variant.fileVariant.scannedFileSize;
4111 #endif
4112
4113                                 }
4114                                 //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
4115                         }
4116                         else
4117                         {
4118                                 // chunkId == 0, so it is an ObjectHeader.
4119                                 // Thus, we read in the object header and make the object
4120                                 yaffs_SetChunkBit(dev,blk,c);
4121                                 bi->pagesInUse++;
4122
4123                                 yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL,1);
4124
4125                                 oh = (yaffs_ObjectHeader *)chunkData;
4126
4127                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
4128
4129                                 if(in->valid)
4130                                 {
4131                                         // We have already filled this one. We have a duplicate and need to resolve it.
4132
4133                                         unsigned existingSerial = in->serial;
4134                                         unsigned newSerial = tags.serialNumber;
4135
4136                                         if(((existingSerial+1) & 3) == newSerial)
4137                                         {
4138                                                 // Use new one - destroy the exisiting one
4139                                                 yaffs_DeleteChunk(dev,in->chunkId,1);
4140                                                 in->valid = 0;
4141                                         }
4142                                         else
4143                                         {
4144                                                 // Use existing - destroy this one.
4145                                                 yaffs_DeleteChunk(dev,chunk,1);
4146                                         }
4147                                 }
4148
4149                                 if(!in->valid &&
4150                                    (tags.objectId == YAFFS_OBJECTID_ROOT ||
4151                                     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
4152                                 {
4153                                         // We only load some info, don't fiddle with directory structure
4154                                         in->valid = 1;
4155                                         in->variantType = oh->type;
4156
4157                                         in->st_mode  = oh->st_mode;
4158 #ifdef CONFIG_YAFFS_WINCE
4159                                         in->win_atime[0] = oh->win_atime[0];
4160                                         in->win_ctime[0] = oh->win_ctime[0];
4161                                         in->win_mtime[0] = oh->win_mtime[0];
4162                                         in->win_atime[1] = oh->win_atime[1];
4163                                         in->win_ctime[1] = oh->win_ctime[1];
4164                                         in->win_mtime[1] = oh->win_mtime[1];
4165 #else
4166                                         in->st_uid   = oh->st_uid;
4167                                         in->st_gid   = oh->st_gid;
4168                                         in->st_atime = oh->st_atime;
4169                                         in->st_mtime = oh->st_mtime;
4170                                         in->st_ctime = oh->st_ctime;
4171                                         in->st_rdev = oh->st_rdev;
4172 #endif
4173                                         in->chunkId  = chunk;
4174
4175                                 }
4176                                 else if(!in->valid)
4177                                 {
4178                                         // we need to load this info
4179
4180                                         in->valid = 1;
4181                                         in->variantType = oh->type;
4182
4183                                         in->st_mode  = oh->st_mode;
4184 #ifdef CONFIG_YAFFS_WINCE
4185                                         in->win_atime[0] = oh->win_atime[0];
4186                                         in->win_ctime[0] = oh->win_ctime[0];
4187                                         in->win_mtime[0] = oh->win_mtime[0];
4188                                         in->win_atime[1] = oh->win_atime[1];
4189                                         in->win_ctime[1] = oh->win_ctime[1];
4190                                         in->win_mtime[1] = oh->win_mtime[1];
4191 #else
4192                                         in->st_uid   = oh->st_uid;
4193                                         in->st_gid   = oh->st_gid;
4194                                         in->st_atime = oh->st_atime;
4195                                         in->st_mtime = oh->st_mtime;
4196                                         in->st_ctime = oh->st_ctime;
4197                                         in->st_rdev = oh->st_rdev;
4198 #endif
4199                                         in->chunkId  = chunk;
4200
4201                                         yaffs_SetObjectName(in,oh->name);
4202                                         in->dirty = 0;
4203
4204                                         // directory stuff...
4205                                         // hook up to parent
4206
4207                                         parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
4208                                         if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
4209                                         {
4210                                                 // Set up as a directory
4211                                                 parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
4212                                                 INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
4213                                         }
4214                                         else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
4215                                         {
4216                                                 // Hoosterman, another problem....
4217                                                 // We're trying to use a non-directory as a directory
4218                                                 // Todo ... handle
4219                                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan" TENDSTR)));
4220
4221                                         }
4222
4223                                         yaffs_AddObjectToDirectory(parent,in);
4224                                         if(parent == dev->unlinkedDir)
4225                                         {
4226                                                 in->deleted = 1; // If it is unlinked at start up then it wants deleting
4227                                                 dev->nDeletedFiles++;
4228                                         }
4229
4230                                         // Note re hardlinks.
4231                                         // Since we might scan a hardlink before its equivalent object is scanned
4232                                         // we put them all in a list.
4233                                         // After scanning is complete, we should have all the objects, so we run through this
4234                                         // list and fix up all the chains.
4235
4236                                         switch(in->variantType)
4237                                         {
4238                                                 case YAFFS_OBJECT_TYPE_UNKNOWN:         // Todo got a problem
4239                                                         break;
4240                                                 case YAFFS_OBJECT_TYPE_FILE:
4241 #ifdef CONFIG_YAFFS_USE_HEADER_FILE_SIZE
4242                                                         in->variant.fileVariant.fileSize = oh->fileSize;
4243 #endif
4244                                                         break;
4245                                                 case YAFFS_OBJECT_TYPE_HARDLINK:
4246                                                         in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
4247                                                         in->hardLinks.next = (struct list_head *)hardList;
4248                                                         hardList = in;
4249                                                         break;
4250                                                 case YAFFS_OBJECT_TYPE_DIRECTORY:       // Do nothing
4251                                                         break;
4252                                                 case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
4253                                                         break;
4254                                                 case YAFFS_OBJECT_TYPE_SYMLINK:         // Do nothing
4255                                                         in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
4256                                                         break;
4257                                         }
4258                                         //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
4259                                 }
4260                         }
4261                 }
4262
4263                 if(state == YAFFS_BLOCK_STATE_SCANNING)
4264                 {
4265                         // If we got this far while scanning, then the block is fully allocated.
4266                         state = YAFFS_BLOCK_STATE_FULL;
4267                 }
4268
4269                 bi->blockState = state;
4270
4271                 // Now let's see if it was dirty
4272                 if(     bi->pagesInUse == 0 &&
4273                 bi->blockState == YAFFS_BLOCK_STATE_FULL)
4274             {
4275                 yaffs_BlockBecameDirty(dev,blk);
4276             }
4277
4278         }
4279
4280         // Fix up the hard link chains.
4281         // We should now have scanned all the objects, now it's time to add these
4282         // hardlinks.
4283         while(hardList)
4284         {
4285                 hl = hardList;
4286                 hardList = (yaffs_Object *)(hardList->hardLinks.next);
4287
4288                 in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
4289
4290                 if(in)
4291                 {
4292                         // Add the hardlink pointers
4293                         hl->variant.hardLinkVariant.equivalentObject=in;
4294                         list_add(&hl->hardLinks,&in->hardLinks);
4295                 }
4296                 else
4297                 {
4298                         //Todo Need to report/handle this better.
4299                         // Got a problem... hardlink to a non-existant object
4300                         hl->variant.hardLinkVariant.equivalentObject=NULL;
4301                         INIT_LIST_HEAD(&hl->hardLinks);
4302
4303                 }
4304
4305         }
4306
4307         {
4308                 struct list_head *i;
4309                 struct list_head *n;
4310
4311                 yaffs_Object *l;
4312                 // Soft delete all the unlinked files
4313                 list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
4314                 {
4315                         if(i)
4316                         {
4317                                 l = list_entry(i, yaffs_Object,siblings);
4318                                 if(l->deleted)
4319                                 {
4320                                         yaffs_SoftDeleteFile(l);
4321                                 }
4322                         }
4323                 }
4324         }
4325
4326
4327         return YAFFS_OK;
4328 }
4329
4330
4331 ////////////////////////// Directory Functions /////////////////////////
4332
4333
4334 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
4335 {
4336
4337         if(obj->siblings.prev == NULL)
4338         {
4339                 // Not initialised
4340                 INIT_LIST_HEAD(&obj->siblings);
4341
4342         }
4343         else if(!list_empty(&obj->siblings))
4344         {
4345                 // If it is holed up somewhere else, un hook it
4346                 list_del_init(&obj->siblings);
4347         }
4348         // Now add it
4349         list_add(&obj->siblings,&directory->variant.directoryVariant.children);
4350         obj->parent = directory;
4351
4352         if(directory == obj->myDev->unlinkedDir)
4353         {
4354                 obj->unlinked = 1;
4355                 obj->myDev->nUnlinkedFiles++;
4356                 obj->renameAllowed = 0;
4357         }
4358 }
4359
4360 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
4361 {
4362         list_del_init(&obj->siblings);
4363         obj->parent = NULL;
4364 }
4365
4366 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name)
4367 {
4368         int sum;
4369
4370         struct list_head *i;
4371         char buffer[YAFFS_MAX_NAME_LENGTH+1];
4372
4373         yaffs_Object *l;
4374
4375         sum = yaffs_CalcNameSum(name);
4376
4377         list_for_each(i,&directory->variant.directoryVariant.children)
4378         {
4379                 if(i)
4380                 {
4381                         l = list_entry(i, yaffs_Object,siblings);
4382
4383                         // Special case for lost-n-found
4384                         if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
4385                         {
4386                                 if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
4387                                 {
4388                                         return l;
4389                                 }
4390                         }
4391                         else if(yaffs_SumCompare(l->sum, sum))
4392                         {
4393                                 // Do a real check
4394                                 yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
4395                                 if(yaffs_strcmp(name,buffer) == 0)
4396                                 {
4397                                         return l;
4398                                 }
4399
4400                         }
4401                 }
4402         }
4403
4404         return NULL;
4405 }
4406
4407
4408 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
4409 {
4410         struct list_head *i;
4411         yaffs_Object *l;
4412
4413
4414         list_for_each(i,&theDir->variant.directoryVariant.children)
4415         {
4416                 if(i)
4417                 {
4418                         l = list_entry(i, yaffs_Object,siblings);
4419                         if(l && !fn(l))
4420                         {
4421                                 return YAFFS_FAIL;
4422                         }
4423                 }
4424         }
4425
4426         return YAFFS_OK;
4427
4428 }
4429
4430
4431 // GetEquivalentObject dereferences any hard links to get to the
4432 // actual object.
4433
4434 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
4435 {
4436         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4437         {
4438                 // We want the object id of the equivalent object, not this one
4439                 obj = obj->variant.hardLinkVariant.equivalentObject;
4440         }
4441         return obj;
4442
4443 }
4444
4445 int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize)
4446 {
4447         memset(name,0,buffSize);
4448
4449         if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)
4450         {
4451                 strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);
4452         }
4453         else if(obj->chunkId <= 0)
4454         {
4455                 char locName[20];
4456                 // make up a name
4457                 sprintf(locName,"%s%d",YAFFS_LOSTNFOUND_PREFIX,obj->objectId);
4458                 strncpy(name,locName,buffSize - 1);
4459
4460         }
4461 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
4462         else if(obj->shortName[0])
4463         {
4464                 strcpy(name,obj->shortName);
4465         }
4466 #endif
4467         else
4468         {
4469                 __u8 buffer[YAFFS_BYTES_PER_CHUNK];
4470                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
4471
4472                 memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
4473
4474                 if(obj->chunkId >= 0)
4475                 {
4476                         yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL,1);
4477                 }
4478                 strncpy(name,oh->name,buffSize - 1);
4479         }
4480
4481         return strlen(name);
4482 }
4483
4484 int yaffs_GetObjectFileLength(yaffs_Object *obj)
4485 {
4486
4487         // Dereference any hard linking
4488         obj = yaffs_GetEquivalentObject(obj);
4489
4490         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4491         {
4492                 return obj->variant.fileVariant.fileSize;
4493         }
4494         if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4495         {
4496                 return strlen(obj->variant.symLinkVariant.alias);
4497         }
4498         else
4499         {
4500                 // Only a directory should drop through to here
4501                 return YAFFS_BYTES_PER_CHUNK;
4502         }
4503 }
4504
4505 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
4506 {
4507         int count = 0;
4508         struct list_head *i;
4509
4510         if(!obj->unlinked)
4511         {
4512                 count++;        // the object itself
4513         }
4514         list_for_each(i,&obj->hardLinks)
4515         {
4516                 count++;        // add the hard links;
4517         }
4518         return count;
4519
4520 }
4521
4522
4523 int yaffs_GetObjectInode(yaffs_Object *obj)
4524 {
4525         obj = yaffs_GetEquivalentObject(obj);
4526
4527         return obj->objectId;
4528 }
4529
4530 unsigned yaffs_GetObjectType(yaffs_Object *obj)
4531 {
4532         obj = yaffs_GetEquivalentObject(obj);
4533
4534         switch(obj->variantType)
4535         {
4536                 case YAFFS_OBJECT_TYPE_FILE:            return DT_REG; break;
4537                 case YAFFS_OBJECT_TYPE_DIRECTORY:       return DT_DIR; break;
4538                 case YAFFS_OBJECT_TYPE_SYMLINK:         return DT_LNK; break;
4539                 case YAFFS_OBJECT_TYPE_HARDLINK:        return DT_REG; break;
4540                 case YAFFS_OBJECT_TYPE_SPECIAL:
4541                         if(S_ISFIFO(obj->st_mode)) return DT_FIFO;
4542                         if(S_ISCHR(obj->st_mode)) return DT_CHR;
4543                         if(S_ISBLK(obj->st_mode)) return DT_BLK;
4544                         if(S_ISSOCK(obj->st_mode)) return DT_SOCK;
4545                 default: return DT_REG; break;
4546         }
4547 }
4548
4549 char *yaffs_GetSymlinkAlias(yaffs_Object *obj)
4550 {
4551         obj = yaffs_GetEquivalentObject(obj);
4552         if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4553         {
4554                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
4555         }
4556         else
4557         {
4558                 return yaffs_CloneString("");
4559         }
4560 }
4561
4562 #ifndef CONFIG_YAFFS_WINCE
4563
4564 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
4565 {
4566         unsigned int valid = attr->ia_valid;
4567
4568         if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode;
4569         if(valid & ATTR_UID) obj->st_uid = attr->ia_uid;
4570         if(valid & ATTR_GID) obj->st_gid = attr->ia_gid;
4571
4572 #if defined(CONFIG_KERNEL_2_5)
4573         if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime.tv_sec;
4574         if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime.tv_sec;
4575         if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime.tv_sec;
4576 #else
4577         if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime;
4578         if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime;
4579         if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime;
4580 #endif
4581
4582         if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
4583
4584         yaffs_UpdateObjectHeader(obj,NULL,1);
4585
4586         return YAFFS_OK;
4587
4588 }
4589 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
4590 {
4591         unsigned int valid = 0;
4592
4593         attr->ia_mode = obj->st_mode;   valid |= ATTR_MODE;
4594         attr->ia_uid = obj->st_uid;             valid |= ATTR_UID;
4595         attr->ia_gid = obj->st_gid;             valid |= ATTR_GID;
4596
4597 #if defined(CONFIG_KERNEL_2_5)
4598         attr->ia_atime.tv_sec = obj->st_atime;  valid |= ATTR_ATIME;
4599         attr->ia_ctime.tv_sec = obj->st_ctime;  valid |= ATTR_CTIME;
4600         attr->ia_mtime.tv_sec = obj->st_mtime;  valid |= ATTR_MTIME;
4601 #else
4602         attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME;
4603         attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME;
4604         attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME;
4605 #endif
4606         attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
4607
4608         attr->ia_valid = valid;
4609
4610         return YAFFS_OK;
4611
4612 }
4613
4614 #endif
4615
4616 int yaffs_DumpObject(yaffs_Object *obj)
4617 {
4618 //      __u8 buffer[YAFFS_BYTES_PER_CHUNK];
4619         char name[257];
4620 //      yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
4621
4622 //      memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
4623
4624 //      if(obj->chunkId >= 0)
4625 //      {
4626 //              yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
4627 //      }
4628
4629         yaffs_GetObjectName(obj,name,256);
4630
4631         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),
4632                         obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial,
4633                         obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
4634
4635 #if 0
4636         YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
4637                         obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
4638                         obj->sum, obj->chunkId));
4639                 switch(obj->variantType)
4640         {
4641                 case YAFFS_OBJECT_TYPE_FILE:
4642                         YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
4643                         break;
4644                 case YAFFS_OBJECT_TYPE_DIRECTORY:
4645                         YPRINTF((" DIRECTORY\n"));
4646                         break;
4647                 case YAFFS_OBJECT_TYPE_HARDLINK: //todo
4648                 case YAFFS_OBJECT_TYPE_SYMLINK:
4649                 case YAFFS_OBJECT_TYPE_UNKNOWN:
4650                 default:
4651         }
4652 #endif
4653
4654         return YAFFS_OK;
4655 }
4656
4657
4658 ///////////////////////// Initialisation code ///////////////////////////
4659
4660
4661
4662 int yaffs_GutsInitialise(yaffs_Device *dev)
4663 {
4664         unsigned x;
4665         int bits;
4666         int extraBits;
4667         int nBlocks;
4668
4669         if(     dev->nBytesPerChunk != YAFFS_BYTES_PER_CHUNK ||
4670
4671                 dev->nChunksPerBlock < 2 ||
4672                 dev->nReservedBlocks < 2 ||
4673                 dev->startBlock <= 0 ||
4674                 dev->endBlock <= 0 ||
4675                 dev->endBlock <= (dev->startBlock + dev->nReservedBlocks)
4676           )
4677         {
4678                 //these parameters must be set before stating yaffs
4679                 // Other parameters startBlock,
4680                 return YAFFS_FAIL;
4681         }
4682
4683
4684
4685         if(!yaffs_CheckStructures())
4686         {
4687                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
4688                 return YAFFS_FAIL;
4689         }
4690
4691         if(dev->isMounted)
4692         {
4693                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device already mounted\n" TENDSTR)));
4694                 return YAFFS_FAIL;
4695         }
4696
4697         dev->isMounted = 1;
4698
4699         if(dev->startBlock <= 0 ||
4700            (dev->endBlock - dev->startBlock) < 10)
4701         {
4702                 T(YAFFS_TRACE_ALWAYS,(TSTR("startBlock %d or endBlock %d invalid\n" TENDSTR),
4703                                 dev->startBlock, dev->endBlock));
4704                 return YAFFS_FAIL;
4705         }
4706
4707         nBlocks = dev->endBlock - dev->startBlock + 1;
4708
4709
4710
4711         // OK now calculate a few things for the device
4712         // Calculate chunkGroupBits.
4713         // We need to find the next power of 2 > than endBlock
4714
4715         x = dev->nChunksPerBlock * (dev->endBlock+1);
4716
4717         for(bits = extraBits = 0; x > 1; bits++)
4718         {
4719                 if(x & 1) extraBits++;
4720                 x >>= 1;
4721         }
4722
4723         if(extraBits > 0) bits++;
4724
4725
4726         // Level0 Tnodes are 16 bits, so if the bitwidth of the
4727         // chunk range we're using is greater than 16 we need
4728         // to figure out chunk shift and chunkGroupSize
4729         if(bits <= 16)
4730         {
4731                 dev->chunkGroupBits = 0;
4732         }
4733         else
4734         {
4735                 dev->chunkGroupBits = bits - 16;
4736         }
4737         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
4738
4739
4740
4741         // More device initialisation
4742         dev->garbageCollections = 0;
4743         dev->passiveGarbageCollections = 0;
4744         dev->currentDirtyChecker = 0;
4745         dev->bufferedBlock = -1;
4746         dev->doingBufferedBlockRewrite = 0;
4747         dev->nDeletedFiles = 0;
4748         dev->nBackgroundDeletions=0;
4749         dev->nUnlinkedFiles = 0;
4750         dev->eccFixed=0;
4751         dev->eccUnfixed=0;
4752         dev->tagsEccFixed=0;
4753         dev->tagsEccUnfixed=0;
4754
4755         dev->localBuffer = YMALLOC(dev->nBytesPerChunk);
4756
4757
4758
4759
4760         yaffs_InitialiseBlocks(dev,nBlocks);
4761
4762         yaffs_InitialiseTnodes(dev);
4763
4764         yaffs_InitialiseObjects(dev);
4765
4766         if(dev->nShortOpCaches > 0)
4767         {
4768                 int i;
4769
4770                 if(dev->nShortOpCaches >  YAFFS_MAX_SHORT_OP_CACHES)
4771                 {
4772                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
4773                 }
4774
4775                 dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
4776
4777                 for(i=0; i < dev->nShortOpCaches; i++)
4778                 {
4779                         dev->srCache[i].object = NULL;
4780                         dev->srCache[i].lastUse = 0;
4781                         dev->srCache[i].dirty = 0;
4782                 }
4783                 dev->srLastUse = 0;
4784         }
4785
4786         dev->cacheHits = 0;
4787
4788
4789         // Initialise the unlinked, root and lost and found directories
4790         dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = NULL;
4791
4792         dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4793
4794         dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
4795         dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
4796         yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
4797
4798
4799         // Now scan the flash.
4800         yaffs_Scan(dev);
4801
4802         // Zero out stats
4803         dev->nPageReads = 0;
4804     dev->nPageWrites =  0;
4805         dev->nBlockErasures = 0;
4806         dev->nGCCopies = 0;
4807         dev->nRetriedWrites = 0;
4808         dev->nRetiredBlocks = 0;
4809
4810
4811         return YAFFS_OK;
4812
4813 }
4814
4815 void yaffs_Deinitialise(yaffs_Device *dev)
4816 {
4817         if(dev->isMounted)
4818         {
4819
4820                 yaffs_DeinitialiseBlocks(dev);
4821                 yaffs_DeinitialiseTnodes(dev);
4822                 yaffs_DeinitialiseObjects(dev);
4823                 YFREE(dev->localBuffer);
4824         }
4825
4826 }
4827
4828 #if 0
4829
4830 int  yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
4831 {
4832         int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * YAFFS_RESERVED_BLOCKS);
4833
4834         struct list_head *i;
4835         yaffs_Object *l;
4836
4837
4838         // To the free chunks add the chunks that are in the deleted unlinked files.
4839         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
4840         {
4841                 l = list_entry(i, yaffs_Object,siblings);
4842                 if(l->deleted)
4843                 {
4844                         nFree++;
4845                         nFree += l->nDataChunks;
4846                 }
4847         }
4848
4849
4850         // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree);
4851
4852         if(nFree < 0) nFree = 0;
4853
4854         return nFree;
4855
4856 }
4857
4858 #endif
4859
4860 int  yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
4861 {
4862         int nFree;
4863         int pending;
4864         int b;
4865         int nDirtyCacheChunks=0;
4866
4867         yaffs_BlockInfo *blk;
4868
4869         struct list_head *i;
4870         yaffs_Object *l;
4871
4872         for(nFree = 0, b = dev->startBlock; b <= dev->endBlock; b++)
4873         {
4874                 blk = yaffs_GetBlockInfo(dev,b);
4875
4876                 switch(blk->blockState)
4877                 {
4878                         case YAFFS_BLOCK_STATE_EMPTY:
4879                         case YAFFS_BLOCK_STATE_ALLOCATING:
4880                         case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse); break;
4881                         default: break;
4882                 }
4883         }
4884
4885
4886         pending = 0;
4887
4888         // To the free chunks add the chunks that are in the deleted unlinked files.
4889         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
4890         {
4891                 if(i)
4892                 {
4893                         l = list_entry(i, yaffs_Object,siblings);
4894                         if(l->deleted)
4895                         {
4896                                 pending++;
4897                                 pending += l->nDataChunks;
4898                         }
4899                 }
4900         }
4901
4902
4903
4904         //printf("___________ really free is %d, pending %d, nFree is %d\n",nFree,pending, nFree+pending);
4905
4906         if(nFree != dev->nFreeChunks)
4907         {
4908         //      printf("___________Different! really free is %d, nFreeChunks %d\n",nFree dev->nFreeChunks);
4909         }
4910
4911         nFree += pending;
4912
4913         // Now count the number of dirty chunks in the cache and subtract those
4914
4915         {
4916                 int i;
4917                 for(i = 0; i < dev->nShortOpCaches; i++)
4918                 {
4919                         if(dev->srCache[i].dirty) nDirtyCacheChunks++;
4920                 }
4921         }
4922
4923         nFree -= nDirtyCacheChunks;
4924
4925         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
4926
4927         if(nFree < 0) nFree = 0;
4928
4929         return nFree;
4930
4931 }
4932
4933
4934
4935 /////////////////// YAFFS test code //////////////////////////////////
4936
4937 #define yaffs_CheckStruct(structure,syze, name) \
4938            if(sizeof(structure) != syze) \
4939                { \
4940                  T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \
4941                  return YAFFS_FAIL; \
4942                    }
4943
4944
4945 static int yaffs_CheckStructures(void)
4946 {
4947         yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")
4948         yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")
4949         yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")
4950 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
4951         yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")
4952 #endif
4953         yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")
4954
4955
4956         return YAFFS_OK;
4957 }
4958
4959 #if 0
4960 void yaffs_GutsTest(yaffs_Device *dev)
4961 {
4962
4963         if(yaffs_CheckStructures() != YAFFS_OK)
4964         {
4965                 T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
4966                 return;
4967         }
4968
4969         yaffs_TnodeTest(dev);
4970         yaffs_ObjectTest(dev);
4971 }
4972 #endif
4973
4974
4975