direct/yaffs_fileem2k.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 /*
  15  * This provides a YAFFS nand emulation on a file for emulating 2kB pages.
  16  * This is only intended as test code to test persistence etc.
  17  */
  18
  19 const char *yaffs_flashif2_c_version = "$Id: yaffs_fileem2k.c,v 1.20 2009-10-15 00:45:46 charles Exp $";
  20
  21
  22 #include "yportenv.h"
  23
  24 #include "yaffs_flashif2.h"
  25 #include "yaffs_guts.h"
  26 #include "devextras.h"
  27
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <unistd.h>
  32
  33 #include "yaffs_fileem2k.h"
  34 #include "yaffs_packedtags2.h"
  35
  36
  37
  38 #define REPORT_ERROR 0
  39
  40 typedef struct
  41 {
  42         __u8 data[PAGE_SIZE]; // Data + spare
  43 } yflash_Page;
  44
  45 typedef struct
  46 {
  47         yflash_Page page[PAGES_PER_BLOCK]; // The pages in the block
  48
  49 } yflash_Block;
  50
  51
  52
  53 #define MAX_HANDLES 20
  54 #define BLOCKS_PER_HANDLE (32*8)
  55
  56 typedef struct
  57 {
  58         int handle[MAX_HANDLES];
  59         int nBlocks;
  60 } yflash_Device;
  61
  62 static yflash_Device filedisk;
  63
  64 int yaffs_testPartialWrite = 0;
  65
  66 extern int random_seed;
  67 extern int simulate_power_failure;
  68 static int initialised = 0;
  69 static int remaining_ops;
  70 static int nops_so_far;
  71
  72 int ops_multiplier;
  73
  74
  75 static void yflash2_MaybePowerFail(unsigned int chunkInNAND, int failPoint)
  76 {
  77
  78    nops_so_far++;
  79
  80
  81    remaining_ops--;
  82    if(simulate_power_failure &&
  83       remaining_ops < 1){
  84        printf("Simulated power failure after %d operations\n",nops_so_far);
  85        printf("  Fail simulated on chunkInNAND %d, at fail point %d\n",
  86                         chunkInNAND, failPoint);
  87         exit(0);
  88   }
  89 }
  90
  91
  92
  93
  94
  95 static __u8 localBuffer[PAGE_SIZE];
  96
  97 static char *NToName(char *buf,int n)
  98 {
  99         sprintf(buf,"emfile-2k-%d",n);
 100         return buf;
 101 }
 102
 103 static char dummyBuffer[BLOCK_SIZE];
 104
 105 static int GetBlockFileHandle(int n)
 106 {
 107         int h;
 108         int requiredSize;
 109
 110         char name[40];
 111         NToName(name,n);
 112         int fSize;
 113         int i;
 114
 115         h =  open(name, O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
 116         if(h >= 0){
 117                 fSize = lseek(h,0,SEEK_END);
 118                 requiredSize = BLOCKS_PER_HANDLE * BLOCK_SIZE;
 119                 if(fSize < requiredSize){
 120                    for(i = 0; i < BLOCKS_PER_HANDLE; i++)
 121                         if(write(h,dummyBuffer,BLOCK_SIZE) != BLOCK_SIZE)
 122                                 return -1;
 123
 124                 }
 125         }
 126
 127         return h;
 128
 129 }
 130
 131 static int  CheckInit(void)
 132 {
 133         static int initialised = 0;
 134         int i;
 135
 136         int blk;
 137
 138
 139         if(initialised)
 140         {
 141                 return YAFFS_OK;
 142         }
 143
 144         initialised = 1;
 145
 146
 147         srand(random_seed);
 148         remaining_ops = (rand() % 1000) * 5;
 149         memset(dummyBuffer,0xff,sizeof(dummyBuffer));
 150
 151
 152
 153         filedisk.nBlocks = SIZE_IN_MB * BLOCKS_PER_MB;
 154
 155         for(i = 0; i <  MAX_HANDLES; i++)
 156                 filedisk.handle[i] = -1;
 157
 158         for(i = 0,blk = 0; blk < filedisk.nBlocks; blk+=BLOCKS_PER_HANDLE,i++)
 159                 filedisk.handle[i] = GetBlockFileHandle(i);
 160
 161
 162         return 1;
 163 }
 164
 165
 166 int yflash2_GetNumberOfBlocks(void)
 167 {
 168         CheckInit();
 169
 170         return filedisk.nBlocks;
 171 }
 172
 173 int yflash2_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
 174 {
 175         int written;
 176         int pos;
 177         int h;
 178         int i;
 179         int nRead;
 180         int error;
 181
 182         T(YAFFS_TRACE_MTD,(TSTR("write chunk %d data %x tags %x" TENDSTR),chunkInNAND,(unsigned)data, (unsigned)tags));
 183
 184         CheckInit();
 185
 186
 187         if(dev->inbandTags){
 188
 189                 yaffs_PackedTags2TagsPart * pt2tp;
 190                 pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
 191                 yaffs_PackTags2TagsPart(pt2tp,tags);
 192
 193                 pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
 194                 h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 195
 196                 lseek(h,pos,SEEK_SET);
 197                 written = write(h,data,dev->totalBytesPerChunk);
 198
 199
 200                 if(yaffs_testPartialWrite){
 201                         close(h);
 202                         exit(1);
 203                 }
 204
 205                 if(written != dev->totalBytesPerChunk) return YAFFS_FAIL;
 206
 207
 208         }
 209
 210         else {
 211                 /* First do a write of a partial page */
 212                 int n_partials;
 213                 int bpos;
 214
 215                 if(data)
 216                 {
 217                         pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
 218                         h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 219
 220
 221                         memcpy(localBuffer,data, dev->nDataBytesPerChunk);
 222
 223                         n_partials = rand()%20;
 224
 225                         for(i = 0; i < n_partials; i++){
 226                                 bpos = rand() % dev->nDataBytesPerChunk;
 227
 228                                 localBuffer[bpos] |= (1 << (rand() & 7));
 229                         }
 230
 231                         if(REPORT_ERROR && memcmp(localBuffer,data,dev->nDataBytesPerChunk))
 232                                 printf("nand simulator: data does not match\n");
 233
 234                         lseek(h,pos,SEEK_SET);
 235                         written = write(h,localBuffer,dev->nDataBytesPerChunk);
 236
 237                         if(yaffs_testPartialWrite){
 238                                 close(h);
 239                                 exit(1);
 240                         }
 241
 242
 243                         if(written != dev->nDataBytesPerChunk) return YAFFS_FAIL;
 244                 }
 245                 // yflash2_MaybePowerFail(chunkInNAND,1);
 246
 247                 if(tags)
 248                 {
 249                         pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE ;
 250                         h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 251
 252                         lseek(h,pos,SEEK_SET);
 253
 254                         if( 0 && dev->isYaffs2)
 255                         {
 256
 257                                 written = write(h,tags,sizeof(yaffs_ExtendedTags));
 258                                 if(written != sizeof(yaffs_ExtendedTags)) return YAFFS_FAIL;
 259                         }
 260                         else
 261                         {
 262                                 yaffs_PackedTags2 pt;
 263                                 yaffs_PackTags2(dev,&pt,tags);
 264                                 __u8 * ptab = (__u8 *)&pt;
 265
 266                                 nRead = read(h,localBuffer,sizeof(pt));
 267                                 for(i = error = 0; REPORT_ERROR && i < sizeof(pt) && !error; i++){
 268                                         if(localBuffer[i] != 0xFF){
 269                                                 printf("nand simulation: chunk %d oob byte %d was %0x2\n",
 270                                                         chunkInNAND,i,localBuffer[i]);
 271                                                         error = 1;
 272                                         }
 273                                 }
 274
 275                                 for(i = 0; i < sizeof(pt); i++)
 276                                 localBuffer[i] &= ptab[i];
 277
 278                                 n_partials = rand()% sizeof(pt);
 279
 280                                 for(i = 0; i < n_partials; i++){
 281                                         bpos = rand() % sizeof(pt);
 282
 283                                         localBuffer[bpos] |= (1 << (rand() & 7));
 284                                 }
 285
 286                                 if(REPORT_ERROR && memcmp(localBuffer,&pt,sizeof(pt)))
 287                                         printf("nand sim: tags corruption\n");
 288
 289                                 lseek(h,pos,SEEK_SET);
 290
 291                                 written = write(h,localBuffer,sizeof(pt));
 292                                 if(written != sizeof(pt)) return YAFFS_FAIL;
 293                         }
 294                 }
 295
 296                 //yflash2_MaybePowerFail(chunkInNAND,2);
 297
 298                 /* Next do the whole write */
 299                 if(data)
 300                 {
 301                         pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
 302                         h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 303
 304
 305                         memset(localBuffer,0xFF, PAGE_SIZE);
 306                         for(i = 0; i < dev->nDataBytesPerChunk; i++){
 307                                 localBuffer[i] &= data[i];
 308                         }
 309
 310                         if(REPORT_ERROR && memcmp(localBuffer,data,dev->nDataBytesPerChunk))
 311                                 printf("nand simulator: data does not match\n");
 312
 313                         lseek(h,pos,SEEK_SET);
 314                         written = write(h,localBuffer,dev->nDataBytesPerChunk);
 315
 316                         if(yaffs_testPartialWrite){
 317                                 close(h);
 318                                 exit(1);
 319                         }
 320
 321
 322                         if(written != dev->nDataBytesPerChunk) return YAFFS_FAIL;
 323                 }
 324
 325                 if(tags)
 326                 {
 327                         pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE ;
 328                         h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 329
 330                         lseek(h,pos,SEEK_SET);
 331
 332                         if( 0 && dev->isYaffs2)
 333                         {
 334
 335                                 written = write(h,tags,sizeof(yaffs_ExtendedTags));
 336                                 if(written != sizeof(yaffs_ExtendedTags)) return YAFFS_FAIL;
 337                         }
 338                         else
 339                         {
 340                                 yaffs_PackedTags2 pt;
 341                                 yaffs_PackTags2(dev,&pt,tags);
 342                                 __u8 * ptab = (__u8 *)&pt;
 343
 344                                 nRead = read(h,localBuffer,sizeof(pt));
 345                                 for(i = error = 0; REPORT_ERROR && i < sizeof(pt) && !error; i++){
 346                                         if(localBuffer[i] != 0xFF){
 347                                                 printf("nand simulation: chunk %d oob byte %d was %0x2\n",
 348                                                         chunkInNAND,i,localBuffer[i]);
 349                                                         error = 1;
 350                                         }
 351                                 }
 352
 353                                 for(i = 0; i < sizeof(pt); i++)
 354                                 localBuffer[i] &= ptab[i];
 355
 356                                 if(REPORT_ERROR && memcmp(localBuffer,&pt,sizeof(pt)))
 357                                         printf("nand sim: tags corruption\n");
 358
 359                                 lseek(h,pos,SEEK_SET);
 360
 361                                 written = write(h,localBuffer,sizeof(pt));
 362                                 if(written != sizeof(pt)) return YAFFS_FAIL;
 363                         }
 364                 }
 365
 366                 yflash2_MaybePowerFail(chunkInNAND,3);
 367
 368         }
 369         return YAFFS_OK;
 370
 371 }
 372
 373 int yaffs_CheckAllFF(const __u8 *ptr, int n)
 374 {
 375         while(n)
 376         {
 377                 n--;
 378                 if(*ptr!=0xFF) return 0;
 379                 ptr++;
 380         }
 381         return 1;
 382 }
 383
 384
 385 static int fail300 = 1;
 386 static int fail320 = 1;
 387
 388 static int failRead10 = 2;
 389
 390 int yflash2_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
 391 {
 392         int nread;
 393         int pos;
 394         int h;
 395         int localData = 0;
 396         int retval = YAFFS_OK;
 397         int nRead;
 398
 399         T(YAFFS_TRACE_MTD,(TSTR("read chunk %d data %x tags %x" TENDSTR),chunkInNAND,(unsigned)data, (unsigned)tags));
 400
 401         CheckInit();
 402
 403
 404
 405
 406         if(dev->inbandTags){
 407                 /* Got to suck the tags out of the data area */
 408                 if(!data) {
 409                         localData=1;
 410                         data = yaffs_GetTempBuffer(dev,__LINE__);
 411                 }
 412
 413
 414                 yaffs_PackedTags2TagsPart * pt2tp;
 415                 pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
 416
 417
 418                 pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
 419                 h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 420
 421                 lseek(h,pos,SEEK_SET);
 422
 423                 nRead = read(h, data,dev->totalBytesPerChunk);
 424
 425                 yaffs_UnpackTags2TagsPart(tags,pt2tp);
 426
 427                 if(nread != dev->totalBytesPerChunk)
 428                         retval = YAFFS_FAIL;
 429
 430                 if(localData)
 431                         yaffs_ReleaseTempBuffer(dev,data,__LINE__);
 432
 433
 434
 435         }
 436
 437         else {
 438
 439                 if(data)
 440                 {
 441
 442                         pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
 443                         h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 444                         lseek(h,pos,SEEK_SET);
 445                         nread = read(h,data,dev->nDataBytesPerChunk);
 446
 447
 448                         if(nread != dev->nDataBytesPerChunk)
 449                                 retval = YAFFS_FAIL;
 450                 }
 451
 452                 if(tags)
 453                 {
 454                         pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
 455                         h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 456                         lseek(h,pos,SEEK_SET);
 457
 458                         if(0 && dev->isYaffs2)
 459                         {
 460                                 nread= read(h,tags,sizeof(yaffs_ExtendedTags));
 461                                 if(nread != sizeof(yaffs_ExtendedTags))
 462                                          retval =  YAFFS_FAIL;
 463                                 if(yaffs_CheckAllFF((__u8 *)tags,sizeof(yaffs_ExtendedTags)))
 464                                 {
 465                                         yaffs_InitialiseTags(tags);
 466                                 }
 467                                 else
 468                                 {
 469                                         tags->chunkUsed = 1;
 470                                 }
 471                         }
 472                         else
 473                         {
 474                                 yaffs_PackedTags2 pt;
 475                                 nread= read(h,&pt,sizeof(pt));
 476                                 yaffs_UnpackTags2(dev,tags,&pt);
 477 #ifdef SIMULATE_FAILURES
 478                                 if((chunkInNAND >> 6) == 100) {
 479                                         if(fail300 && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR){
 480                                                 tags->eccResult = YAFFS_ECC_RESULT_FIXED;
 481                                                 fail300 = 0;
 482                                         }
 483                                 }
 484
 485                                 if((chunkInNAND >> 6) == 110) {
 486                                         if(fail320 && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR){
 487                                                 tags->eccResult = YAFFS_ECC_RESULT_FIXED;
 488                                                 fail320 = 0;
 489                                         }
 490                                 }
 491 #endif
 492                                 if(failRead10>0 && chunkInNAND == 10){
 493                                         failRead10--;
 494                                         nread = 0;
 495                                 }
 496
 497                                 if(nread != sizeof(pt))
 498                                         retval = YAFFS_FAIL;
 499                         }
 500                 }
 501         }
 502
 503
 504
 505         return retval;
 506
 507 }
 508
 509
 510 int yflash2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 511 {
 512         int written;
 513         int h;
 514
 515         yaffs_PackedTags2 pt;
 516
 517         CheckInit();
 518
 519         memset(&pt,0,sizeof(pt));
 520         h = filedisk.handle[(blockNo / ( BLOCKS_PER_HANDLE))];
 521         lseek(h,((blockNo % BLOCKS_PER_HANDLE) * dev->nChunksPerBlock) * PAGE_SIZE + PAGE_DATA_SIZE,SEEK_SET);
 522         written = write(h,&pt,sizeof(pt));
 523
 524         if(written != sizeof(pt)) return YAFFS_FAIL;
 525
 526
 527         return YAFFS_OK;
 528
 529 }
 530
 531 int yflash2_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 532 {
 533
 534         int i;
 535         int h;
 536
 537         CheckInit();
 538
 539         printf("erase block %d\n",blockNumber);
 540
 541         if(blockNumber == 320)
 542                 fail320 = 1;
 543
 544         if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
 545         {
 546                 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
 547                 return YAFFS_FAIL;
 548         }
 549         else
 550         {
 551
 552                 __u8 pg[PAGE_SIZE];
 553                 int syz = PAGE_SIZE;
 554                 int pos;
 555
 556                 memset(pg,0xff,syz);
 557
 558
 559                 h = filedisk.handle[(blockNumber / ( BLOCKS_PER_HANDLE))];
 560                 lseek(h,((blockNumber % BLOCKS_PER_HANDLE) * dev->nChunksPerBlock) * PAGE_SIZE,SEEK_SET);
 561                 for(i = 0; i < dev->nChunksPerBlock; i++)
 562                 {
 563                         write(h,pg,PAGE_SIZE);
 564                 }
 565                 pos = lseek(h, 0,SEEK_CUR);
 566
 567                 return YAFFS_OK;
 568         }
 569
 570 }
 571
 572 int yflash2_InitialiseNAND(yaffs_Device *dev)
 573 {
 574         CheckInit();
 575
 576         return YAFFS_OK;
 577 }
 578
 579
 580
 581
 582 int yflash2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, __u32 *sequenceNumber)
 583 {
 584         yaffs_ExtendedTags tags;
 585         int chunkNo;
 586
 587         *sequenceNumber = 0;
 588
 589         chunkNo = blockNo * dev->nChunksPerBlock;
 590
 591         yflash2_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
 592         if(tags.blockBad)
 593         {
 594                 *state = YAFFS_BLOCK_STATE_DEAD;
 595         }
 596         else if(!tags.chunkUsed)
 597         {
 598                 *state = YAFFS_BLOCK_STATE_EMPTY;
 599         }
 600         else if(tags.chunkUsed)
 601         {
 602                 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
 603                 *sequenceNumber = tags.sequenceNumber;
 604         }
 605         return YAFFS_OK;
 606 }
 607