drivers/mtd/rfd_ftl.c

   1 /*
   2  * rfd_ftl.c -- resident flash disk (flash translation layer)
   3  *
   4  * Copyright © 2005  Sean Young <sean@mess.org>
   5  *
   6  * This type of flash translation layer (FTL) is used by the Embedded BIOS
   7  * by General Software. It is known as the Resident Flash Disk (RFD), see:
   8  *
   9  *      http://www.gensw.com/pages/prod/bios/rfd.htm
  10  *
  11  * based on ftl.c
  12  */
  13
  14 #include <linux/hdreg.h>
  15 #include <linux/init.h>
  16 #include <linux/mtd/blktrans.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/slab.h>
  20 #include <linux/jiffies.h>
  21 #include <linux/module.h>
  22
  23 #include <asm/types.h>
  24
  25 static int block_size = 0;
  26 module_param(block_size, int, 0);
  27 MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size");
  28
  29 #define PREFIX "rfd_ftl: "
  30
  31 /* This major has been assigned by device@lanana.org */
  32 #ifndef RFD_FTL_MAJOR
  33 #define RFD_FTL_MAJOR           256
  34 #endif
  35
  36 /* Maximum number of partitions in an FTL region */
  37 #define PART_BITS               4
  38
  39 /* An erase unit should start with this value */
  40 #define RFD_MAGIC               0x9193
  41
  42 /* the second value is 0xffff or 0xffc8; function unknown */
  43
  44 /* the third value is always 0xffff, ignored */
  45
  46 /* next is an array of mapping for each corresponding sector */
  47 #define HEADER_MAP_OFFSET       3
  48 #define SECTOR_DELETED          0x0000
  49 #define SECTOR_ZERO             0xfffe
  50 #define SECTOR_FREE             0xffff
  51
  52 #define SECTOR_SIZE             512
  53
  54 #define SECTORS_PER_TRACK       63
  55
  56 struct block {
  57         enum {
  58                 BLOCK_OK,
  59                 BLOCK_ERASING,
  60                 BLOCK_ERASED,
  61                 BLOCK_UNUSED,
  62                 BLOCK_FAILED
  63         } state;
  64         int free_sectors;
  65         int used_sectors;
  66         int erases;
  67         u_long offset;
  68 };
  69
  70 struct partition {
  71         struct mtd_blktrans_dev mbd;
  72
  73         u_int block_size;               /* size of erase unit */
  74         u_int total_blocks;             /* number of erase units */
  75         u_int header_sectors_per_block; /* header sectors in erase unit */
  76         u_int data_sectors_per_block;   /* data sectors in erase unit */
  77         u_int sector_count;             /* sectors in translated disk */
  78         u_int header_size;              /* bytes in header sector */
  79         int reserved_block;             /* block next up for reclaim */
  80         int current_block;              /* block to write to */
  81         u16 *header_cache;              /* cached header */
  82
  83         int is_reclaiming;
  84         int cylinders;
  85         int errors;
  86         u_long *sector_map;
  87         struct block *blocks;
  88 };
  89
  90 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf);
  91
  92 static int build_block_map(struct partition *part, int block_no)
  93 {
  94         struct block *block = &part->blocks[block_no];
  95         int i;
  96
  97         block->offset = part->block_size * block_no;
  98
  99         if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) {
 100                 block->state = BLOCK_UNUSED;
 101                 return -ENOENT;
 102         }
 103
 104         block->state = BLOCK_OK;
 105
 106         for (i=0; i<part->data_sectors_per_block; i++) {
 107                 u16 entry;
 108
 109                 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]);
 110
 111                 if (entry == SECTOR_DELETED)
 112                         continue;
 113
 114                 if (entry == SECTOR_FREE) {
 115                         block->free_sectors++;
 116                         continue;
 117                 }
 118
 119                 if (entry == SECTOR_ZERO)
 120                         entry = 0;
 121
 122                 if (entry >= part->sector_count) {
 123                         printk(KERN_WARNING PREFIX
 124                                 "'%s': unit #%d: entry %d corrupt, "
 125                                 "sector %d out of range\n",
 126                                 part->mbd.mtd->name, block_no, i, entry);
 127                         continue;
 128                 }
 129
 130                 if (part->sector_map[entry] != -1) {
 131                         printk(KERN_WARNING PREFIX
 132                                 "'%s': more than one entry for sector %d\n",
 133                                 part->mbd.mtd->name, entry);
 134                         part->errors = 1;
 135                         continue;
 136                 }
 137
 138                 part->sector_map[entry] = block->offset +
 139                         (i + part->header_sectors_per_block) * SECTOR_SIZE;
 140
 141                 block->used_sectors++;
 142         }
 143
 144         if (block->free_sectors == part->data_sectors_per_block)
 145                 part->reserved_block = block_no;
 146
 147         return 0;
 148 }
 149
 150 static int scan_header(struct partition *part)
 151 {
 152         int sectors_per_block;
 153         int i, rc = -ENOMEM;
 154         int blocks_found;
 155         size_t retlen;
 156
 157         sectors_per_block = part->block_size / SECTOR_SIZE;
 158         part->total_blocks = (u32)part->mbd.mtd->size / part->block_size;
 159
 160         if (part->total_blocks < 2)
 161                 return -ENOENT;
 162
 163         /* each erase block has three bytes header, followed by the map */
 164         part->header_sectors_per_block =
 165                         ((HEADER_MAP_OFFSET + sectors_per_block) *
 166                         sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE;
 167
 168         part->data_sectors_per_block = sectors_per_block -
 169                         part->header_sectors_per_block;
 170
 171         part->header_size = (HEADER_MAP_OFFSET +
 172                         part->data_sectors_per_block) * sizeof(u16);
 173
 174         part->cylinders = (part->data_sectors_per_block *
 175                         (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK;
 176
 177         part->sector_count = part->cylinders * SECTORS_PER_TRACK;
 178
 179         part->current_block = -1;
 180         part->reserved_block = -1;
 181         part->is_reclaiming = 0;
 182
 183         part->header_cache = kmalloc(part->header_size, GFP_KERNEL);
 184         if (!part->header_cache)
 185                 goto err;
 186
 187         part->blocks = kcalloc(part->total_blocks, sizeof(struct block),
 188                         GFP_KERNEL);
 189         if (!part->blocks)
 190                 goto err;
 191
 192         part->sector_map = vmalloc(array_size(sizeof(u_long),
 193                                               part->sector_count));
 194         if (!part->sector_map) {
 195                 printk(KERN_ERR PREFIX "'%s': unable to allocate memory for "
 196                         "sector map", part->mbd.mtd->name);
 197                 goto err;
 198         }
 199
 200         for (i=0; i<part->sector_count; i++)
 201                 part->sector_map[i] = -1;
 202
 203         for (i=0, blocks_found=0; i<part->total_blocks; i++) {
 204                 rc = mtd_read(part->mbd.mtd, i * part->block_size,
 205                               part->header_size, &retlen,
 206                               (u_char *)part->header_cache);
 207
 208                 if (!rc && retlen != part->header_size)
 209                         rc = -EIO;
 210
 211                 if (rc)
 212                         goto err;
 213
 214                 if (!build_block_map(part, i))
 215                         blocks_found++;
 216         }
 217
 218         if (blocks_found == 0) {
 219                 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n",
 220                                 part->mbd.mtd->name);
 221                 rc = -ENOENT;
 222                 goto err;
 223         }
 224
 225         if (part->reserved_block == -1) {
 226                 printk(KERN_WARNING PREFIX "'%s': no empty erase unit found\n",
 227                                 part->mbd.mtd->name);
 228
 229                 part->errors = 1;
 230         }
 231
 232         return 0;
 233
 234 err:
 235         vfree(part->sector_map);
 236         kfree(part->header_cache);
 237         kfree(part->blocks);
 238
 239         return rc;
 240 }
 241
 242 static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
 243 {
 244         struct partition *part = (struct partition*)dev;
 245         u_long addr;
 246         size_t retlen;
 247         int rc;
 248
 249         if (sector >= part->sector_count)
 250                 return -EIO;
 251
 252         addr = part->sector_map[sector];
 253         if (addr != -1) {
 254                 rc = mtd_read(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
 255                               (u_char *)buf);
 256                 if (!rc && retlen != SECTOR_SIZE)
 257                         rc = -EIO;
 258
 259                 if (rc) {
 260                         printk(KERN_WARNING PREFIX "error reading '%s' at "
 261                                 "0x%lx\n", part->mbd.mtd->name, addr);
 262                         return rc;
 263                 }
 264         } else
 265                 memset(buf, 0, SECTOR_SIZE);
 266
 267         return 0;
 268 }
 269
 270 static int erase_block(struct partition *part, int block)
 271 {
 272         struct erase_info *erase;
 273         int rc;
 274
 275         erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
 276         if (!erase)
 277                 return -ENOMEM;
 278
 279         erase->addr = part->blocks[block].offset;
 280         erase->len = part->block_size;
 281
 282         part->blocks[block].state = BLOCK_ERASING;
 283         part->blocks[block].free_sectors = 0;
 284
 285         rc = mtd_erase(part->mbd.mtd, erase);
 286         if (rc) {
 287                 printk(KERN_ERR PREFIX "erase of region %llx,%llx on '%s' "
 288                                 "failed\n", (unsigned long long)erase->addr,
 289                                 (unsigned long long)erase->len, part->mbd.mtd->name);
 290                 part->blocks[block].state = BLOCK_FAILED;
 291                 part->blocks[block].free_sectors = 0;
 292                 part->blocks[block].used_sectors = 0;
 293         } else {
 294                 u16 magic = cpu_to_le16(RFD_MAGIC);
 295                 size_t retlen;
 296
 297                 part->blocks[block].state = BLOCK_ERASED;
 298                 part->blocks[block].free_sectors = part->data_sectors_per_block;
 299                 part->blocks[block].used_sectors = 0;
 300                 part->blocks[block].erases++;
 301
 302                 rc = mtd_write(part->mbd.mtd, part->blocks[block].offset,
 303                                sizeof(magic), &retlen, (u_char *)&magic);
 304                 if (!rc && retlen != sizeof(magic))
 305                         rc = -EIO;
 306
 307                 if (rc) {
 308                         pr_err(PREFIX "'%s': unable to write RFD header at 0x%lx\n",
 309                                part->mbd.mtd->name, part->blocks[block].offset);
 310                         part->blocks[block].state = BLOCK_FAILED;
 311                 } else {
 312                         part->blocks[block].state = BLOCK_OK;
 313                 }
 314         }
 315
 316         kfree(erase);
 317
 318         return rc;
 319 }
 320
 321 static int move_block_contents(struct partition *part, int block_no, u_long *old_sector)
 322 {
 323         void *sector_data;
 324         u16 *map;
 325         size_t retlen;
 326         int i, rc = -ENOMEM;
 327
 328         part->is_reclaiming = 1;
 329
 330         sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL);
 331         if (!sector_data)
 332                 goto err3;
 333
 334         map = kmalloc(part->header_size, GFP_KERNEL);
 335         if (!map)
 336                 goto err2;
 337
 338         rc = mtd_read(part->mbd.mtd, part->blocks[block_no].offset,
 339                       part->header_size, &retlen, (u_char *)map);
 340
 341         if (!rc && retlen != part->header_size)
 342                 rc = -EIO;
 343
 344         if (rc) {
 345                 printk(KERN_ERR PREFIX "error reading '%s' at "
 346                         "0x%lx\n", part->mbd.mtd->name,
 347                         part->blocks[block_no].offset);
 348
 349                 goto err;
 350         }
 351
 352         for (i=0; i<part->data_sectors_per_block; i++) {
 353                 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]);
 354                 u_long addr;
 355
 356
 357                 if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
 358                         continue;
 359
 360                 if (entry == SECTOR_ZERO)
 361                         entry = 0;
 362
 363                 /* already warned about and ignored in build_block_map() */
 364                 if (entry >= part->sector_count)
 365                         continue;
 366
 367                 addr = part->blocks[block_no].offset +
 368                         (i + part->header_sectors_per_block) * SECTOR_SIZE;
 369
 370                 if (*old_sector == addr) {
 371                         *old_sector = -1;
 372                         if (!part->blocks[block_no].used_sectors--) {
 373                                 rc = erase_block(part, block_no);
 374                                 break;
 375                         }
 376                         continue;
 377                 }
 378                 rc = mtd_read(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
 379                               sector_data);
 380
 381                 if (!rc && retlen != SECTOR_SIZE)
 382                         rc = -EIO;
 383
 384                 if (rc) {
 385                         printk(KERN_ERR PREFIX "'%s': Unable to "
 386                                 "read sector for relocation\n",
 387                                 part->mbd.mtd->name);
 388
 389                         goto err;
 390                 }
 391
 392                 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part,
 393                                 entry, sector_data);
 394
 395                 if (rc)
 396                         goto err;
 397         }
 398
 399 err:
 400         kfree(map);
 401 err2:
 402         kfree(sector_data);
 403 err3:
 404         part->is_reclaiming = 0;
 405
 406         return rc;
 407 }
 408
 409 static int reclaim_block(struct partition *part, u_long *old_sector)
 410 {
 411         int block, best_block, score, old_sector_block;
 412         int rc;
 413
 414         /* we have a race if sync doesn't exist */
 415         mtd_sync(part->mbd.mtd);
 416
 417         score = 0x7fffffff; /* MAX_INT */
 418         best_block = -1;
 419         if (*old_sector != -1)
 420                 old_sector_block = *old_sector / part->block_size;
 421         else
 422                 old_sector_block = -1;
 423
 424         for (block=0; block<part->total_blocks; block++) {
 425                 int this_score;
 426
 427                 if (block == part->reserved_block)
 428                         continue;
 429
 430                 /*
 431                  * Postpone reclaiming if there is a free sector as
 432                  * more removed sectors is more efficient (have to move
 433                  * less).
 434                  */
 435                 if (part->blocks[block].free_sectors)
 436                         return 0;
 437
 438                 this_score = part->blocks[block].used_sectors;
 439
 440                 if (block == old_sector_block)
 441                         this_score--;
 442                 else {
 443                         /* no point in moving a full block */
 444                         if (part->blocks[block].used_sectors ==
 445                                         part->data_sectors_per_block)
 446                                 continue;
 447                 }
 448
 449                 this_score += part->blocks[block].erases;
 450
 451                 if (this_score < score) {
 452                         best_block = block;
 453                         score = this_score;
 454                 }
 455         }
 456
 457         if (best_block == -1)
 458                 return -ENOSPC;
 459
 460         part->current_block = -1;
 461         part->reserved_block = best_block;
 462
 463         pr_debug("reclaim_block: reclaiming block #%d with %d used "
 464                  "%d free sectors\n", best_block,
 465                  part->blocks[best_block].used_sectors,
 466                  part->blocks[best_block].free_sectors);
 467
 468         if (part->blocks[best_block].used_sectors)
 469                 rc = move_block_contents(part, best_block, old_sector);
 470         else
 471                 rc = erase_block(part, best_block);
 472
 473         return rc;
 474 }
 475
 476 /*
 477  * IMPROVE: It would be best to choose the block with the most deleted sectors,
 478  * because if we fill that one up first it'll have the most chance of having
 479  * the least live sectors at reclaim.
 480  */
 481 static int find_free_block(struct partition *part)
 482 {
 483         int block, stop;
 484
 485         block = part->current_block == -1 ?
 486                         jiffies % part->total_blocks : part->current_block;
 487         stop = block;
 488
 489         do {
 490                 if (part->blocks[block].free_sectors &&
 491                                 block != part->reserved_block)
 492                         return block;
 493
 494                 if (part->blocks[block].state == BLOCK_UNUSED)
 495                         erase_block(part, block);
 496
 497                 if (++block >= part->total_blocks)
 498                         block = 0;
 499
 500         } while (block != stop);
 501
 502         return -1;
 503 }
 504
 505 static int find_writable_block(struct partition *part, u_long *old_sector)
 506 {
 507         int rc, block;
 508         size_t retlen;
 509
 510         block = find_free_block(part);
 511
 512         if (block == -1) {
 513                 if (!part->is_reclaiming) {
 514                         rc = reclaim_block(part, old_sector);
 515                         if (rc)
 516                                 goto err;
 517
 518                         block = find_free_block(part);
 519                 }
 520
 521                 if (block == -1) {
 522                         rc = -ENOSPC;
 523                         goto err;
 524                 }
 525         }
 526
 527         rc = mtd_read(part->mbd.mtd, part->blocks[block].offset,
 528                       part->header_size, &retlen,
 529                       (u_char *)part->header_cache);
 530
 531         if (!rc && retlen != part->header_size)
 532                 rc = -EIO;
 533
 534         if (rc) {
 535                 printk(KERN_ERR PREFIX "'%s': unable to read header at "
 536                                 "0x%lx\n", part->mbd.mtd->name,
 537                                 part->blocks[block].offset);
 538                 goto err;
 539         }
 540
 541         part->current_block = block;
 542
 543 err:
 544         return rc;
 545 }
 546
 547 static int mark_sector_deleted(struct partition *part, u_long old_addr)
 548 {
 549         int block, offset, rc;
 550         u_long addr;
 551         size_t retlen;
 552         u16 del = cpu_to_le16(SECTOR_DELETED);
 553
 554         block = old_addr / part->block_size;
 555         offset = (old_addr % part->block_size) / SECTOR_SIZE -
 556                 part->header_sectors_per_block;
 557
 558         addr = part->blocks[block].offset +
 559                         (HEADER_MAP_OFFSET + offset) * sizeof(u16);
 560         rc = mtd_write(part->mbd.mtd, addr, sizeof(del), &retlen,
 561                        (u_char *)&del);
 562
 563         if (!rc && retlen != sizeof(del))
 564                 rc = -EIO;
 565
 566         if (rc) {
 567                 printk(KERN_ERR PREFIX "error writing '%s' at "
 568                         "0x%lx\n", part->mbd.mtd->name, addr);
 569                 goto err;
 570         }
 571         if (block == part->current_block)
 572                 part->header_cache[offset + HEADER_MAP_OFFSET] = del;
 573
 574         part->blocks[block].used_sectors--;
 575
 576         if (!part->blocks[block].used_sectors &&
 577             !part->blocks[block].free_sectors)
 578                 rc = erase_block(part, block);
 579
 580 err:
 581         return rc;
 582 }
 583
 584 static int find_free_sector(const struct partition *part, const struct block *block)
 585 {
 586         int i, stop;
 587
 588         i = stop = part->data_sectors_per_block - block->free_sectors;
 589
 590         do {
 591                 if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i])
 592                                 == SECTOR_FREE)
 593                         return i;
 594
 595                 if (++i == part->data_sectors_per_block)
 596                         i = 0;
 597         }
 598         while(i != stop);
 599
 600         return -1;
 601 }
 602
 603 static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr)
 604 {
 605         struct partition *part = (struct partition*)dev;
 606         struct block *block;
 607         u_long addr;
 608         int i;
 609         int rc;
 610         size_t retlen;
 611         u16 entry;
 612
 613         if (part->current_block == -1 ||
 614                 !part->blocks[part->current_block].free_sectors) {
 615
 616                 rc = find_writable_block(part, old_addr);
 617                 if (rc)
 618                         goto err;
 619         }
 620
 621         block = &part->blocks[part->current_block];
 622
 623         i = find_free_sector(part, block);
 624
 625         if (i < 0) {
 626                 rc = -ENOSPC;
 627                 goto err;
 628         }
 629
 630         addr = (i + part->header_sectors_per_block) * SECTOR_SIZE +
 631                 block->offset;
 632         rc = mtd_write(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
 633                        (u_char *)buf);
 634
 635         if (!rc && retlen != SECTOR_SIZE)
 636                 rc = -EIO;
 637
 638         if (rc) {
 639                 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
 640                                 part->mbd.mtd->name, addr);
 641                 goto err;
 642         }
 643
 644         part->sector_map[sector] = addr;
 645
 646         entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector);
 647
 648         part->header_cache[i + HEADER_MAP_OFFSET] = entry;
 649
 650         addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16);
 651         rc = mtd_write(part->mbd.mtd, addr, sizeof(entry), &retlen,
 652                        (u_char *)&entry);
 653
 654         if (!rc && retlen != sizeof(entry))
 655                 rc = -EIO;
 656
 657         if (rc) {
 658                 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
 659                                 part->mbd.mtd->name, addr);
 660                 goto err;
 661         }
 662         block->used_sectors++;
 663         block->free_sectors--;
 664
 665 err:
 666         return rc;
 667 }
 668
 669 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
 670 {
 671         struct partition *part = (struct partition*)dev;
 672         u_long old_addr;
 673         int i;
 674         int rc = 0;
 675
 676         pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector);
 677
 678         if (part->reserved_block == -1) {
 679                 rc = -EACCES;
 680                 goto err;
 681         }
 682
 683         if (sector >= part->sector_count) {
 684                 rc = -EIO;
 685                 goto err;
 686         }
 687
 688         old_addr = part->sector_map[sector];
 689
 690         for (i=0; i<SECTOR_SIZE; i++) {
 691                 if (!buf[i])
 692                         continue;
 693
 694                 rc = do_writesect(dev, sector, buf, &old_addr);
 695                 if (rc)
 696                         goto err;
 697                 break;
 698         }
 699
 700         if (i == SECTOR_SIZE)
 701                 part->sector_map[sector] = -1;
 702
 703         if (old_addr != -1)
 704                 rc = mark_sector_deleted(part, old_addr);
 705
 706 err:
 707         return rc;
 708 }
 709
 710 static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
 711 {
 712         struct partition *part = (struct partition*)dev;
 713
 714         geo->heads = 1;
 715         geo->sectors = SECTORS_PER_TRACK;
 716         geo->cylinders = part->cylinders;
 717
 718         return 0;
 719 }
 720
 721 static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
 722 {
 723         struct partition *part;
 724
 725         if (mtd->type != MTD_NORFLASH || mtd->size > UINT_MAX)
 726                 return;
 727
 728         part = kzalloc(sizeof(struct partition), GFP_KERNEL);
 729         if (!part)
 730                 return;
 731
 732         part->mbd.mtd = mtd;
 733
 734         if (block_size)
 735                 part->block_size = block_size;
 736         else {
 737                 if (!mtd->erasesize) {
 738                         printk(KERN_WARNING PREFIX "please provide block_size");
 739                         goto out;
 740                 } else
 741                         part->block_size = mtd->erasesize;
 742         }
 743
 744         if (scan_header(part) == 0) {
 745                 part->mbd.size = part->sector_count;
 746                 part->mbd.tr = tr;
 747                 part->mbd.devnum = -1;
 748                 if (!(mtd->flags & MTD_WRITEABLE))
 749                         part->mbd.readonly = 1;
 750                 else if (part->errors) {
 751                         printk(KERN_WARNING PREFIX "'%s': errors found, "
 752                                         "setting read-only\n", mtd->name);
 753                         part->mbd.readonly = 1;
 754                 }
 755
 756                 printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n",
 757                                 mtd->name, mtd->type, mtd->flags);
 758
 759                 if (!add_mtd_blktrans_dev((void*)part))
 760                         return;
 761         }
 762 out:
 763         kfree(part);
 764 }
 765
 766 static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev)
 767 {
 768         struct partition *part = (struct partition*)dev;
 769         int i;
 770
 771         for (i=0; i<part->total_blocks; i++) {
 772                 pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n",
 773                         part->mbd.mtd->name, i, part->blocks[i].erases);
 774         }
 775
 776         del_mtd_blktrans_dev(dev);
 777         vfree(part->sector_map);
 778         kfree(part->header_cache);
 779         kfree(part->blocks);
 780 }
 781
 782 static struct mtd_blktrans_ops rfd_ftl_tr = {
 783         .name           = "rfd",
 784         .major          = RFD_FTL_MAJOR,
 785         .part_bits      = PART_BITS,
 786         .blksize        = SECTOR_SIZE,
 787
 788         .readsect       = rfd_ftl_readsect,
 789         .writesect      = rfd_ftl_writesect,
 790         .getgeo         = rfd_ftl_getgeo,
 791         .add_mtd        = rfd_ftl_add_mtd,
 792         .remove_dev     = rfd_ftl_remove_dev,
 793         .owner          = THIS_MODULE,
 794 };
 795
 796 static int __init init_rfd_ftl(void)
 797 {
 798         return register_mtd_blktrans(&rfd_ftl_tr);
 799 }
 800
 801 static void __exit cleanup_rfd_ftl(void)
 802 {
 803         deregister_mtd_blktrans(&rfd_ftl_tr);
 804 }
 805
 806 module_init(init_rfd_ftl);
 807 module_exit(cleanup_rfd_ftl);
 808
 809 MODULE_LICENSE("GPL");
 810 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 811 MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, "
 812                 "used by General Software's Embedded BIOS");
 813