disk/part.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #include <common.h>
   8 #include <blk.h>
   9 #include <command.h>
  10 #include <env.h>
  11 #include <errno.h>
  12 #include <ide.h>
  13 #include <log.h>
  14 #include <malloc.h>
  15 #include <part.h>
  16 #include <ubifs_uboot.h>
  17
  18 #undef  PART_DEBUG
  19
  20 #ifdef  PART_DEBUG
  21 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  22 #else
  23 #define PRINTF(fmt,args...)
  24 #endif
  25
  26 /* Check all partition types */
  27 #define PART_TYPE_ALL           -1
  28
  29 static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
  30 {
  31         struct part_driver *drv =
  32                 ll_entry_start(struct part_driver, part_driver);
  33         const int n_ents = ll_entry_count(struct part_driver, part_driver);
  34         struct part_driver *entry;
  35
  36         if (dev_desc->part_type == PART_TYPE_UNKNOWN) {
  37                 for (entry = drv; entry != drv + n_ents; entry++) {
  38                         int ret;
  39
  40                         ret = entry->test(dev_desc);
  41                         if (!ret) {
  42                                 dev_desc->part_type = entry->part_type;
  43                                 return entry;
  44                         }
  45                 }
  46         } else {
  47                 for (entry = drv; entry != drv + n_ents; entry++) {
  48                         if (dev_desc->part_type == entry->part_type)
  49                                 return entry;
  50                 }
  51         }
  52
  53         /* Not found */
  54         return NULL;
  55 }
  56
  57 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  58 static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  59 {
  60         struct blk_desc *dev_desc;
  61         int ret;
  62
  63         dev_desc = blk_get_devnum_by_typename(ifname, dev);
  64         if (!dev_desc) {
  65                 debug("%s: No device for iface '%s', dev %d\n", __func__,
  66                       ifname, dev);
  67                 return NULL;
  68         }
  69         ret = blk_dselect_hwpart(dev_desc, hwpart);
  70         if (ret) {
  71                 debug("%s: Failed to select h/w partition: err-%d\n", __func__,
  72                       ret);
  73                 return NULL;
  74         }
  75
  76         return dev_desc;
  77 }
  78
  79 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  80 {
  81         return get_dev_hwpart(ifname, dev, 0);
  82 }
  83 #else
  84 struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  85 {
  86         return NULL;
  87 }
  88
  89 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  90 {
  91         return NULL;
  92 }
  93 #endif
  94
  95 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  96
  97 /* ------------------------------------------------------------------------- */
  98 /*
  99  * reports device info to the user
 100  */
 101
 102 #ifdef CONFIG_LBA48
 103 typedef uint64_t lba512_t;
 104 #else
 105 typedef lbaint_t lba512_t;
 106 #endif
 107
 108 /*
 109  * Overflowless variant of (block_count * mul_by / 2**right_shift)
 110  * when 2**right_shift > mul_by
 111  */
 112 static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by,
 113                               int right_shift)
 114 {
 115         lba512_t bc_quot, bc_rem;
 116
 117         /* x * m / d == x / d * m + (x % d) * m / d */
 118         bc_quot = block_count >> right_shift;
 119         bc_rem  = block_count - (bc_quot << right_shift);
 120         return bc_quot * mul_by + ((bc_rem * mul_by) >> right_shift);
 121 }
 122
 123 void dev_print (struct blk_desc *dev_desc)
 124 {
 125         lba512_t lba512; /* number of blocks if 512bytes block size */
 126
 127         if (dev_desc->type == DEV_TYPE_UNKNOWN) {
 128                 puts ("not available\n");
 129                 return;
 130         }
 131
 132         switch (dev_desc->if_type) {
 133         case IF_TYPE_SCSI:
 134                 printf ("(%d:%d) Vendor: %s Prod.: %s Rev: %s\n",
 135                         dev_desc->target,dev_desc->lun,
 136                         dev_desc->vendor,
 137                         dev_desc->product,
 138                         dev_desc->revision);
 139                 break;
 140         case IF_TYPE_ATAPI:
 141         case IF_TYPE_IDE:
 142         case IF_TYPE_SATA:
 143                 printf ("Model: %s Firm: %s Ser#: %s\n",
 144                         dev_desc->vendor,
 145                         dev_desc->revision,
 146                         dev_desc->product);
 147                 break;
 148         case IF_TYPE_SD:
 149         case IF_TYPE_MMC:
 150         case IF_TYPE_USB:
 151         case IF_TYPE_NVME:
 152         case IF_TYPE_PVBLOCK:
 153         case IF_TYPE_HOST:
 154                 printf ("Vendor: %s Rev: %s Prod: %s\n",
 155                         dev_desc->vendor,
 156                         dev_desc->revision,
 157                         dev_desc->product);
 158                 break;
 159         case IF_TYPE_VIRTIO:
 160                 printf("%s VirtIO Block Device\n", dev_desc->vendor);
 161                 break;
 162         case IF_TYPE_DOC:
 163                 puts("device type DOC\n");
 164                 return;
 165         case IF_TYPE_UNKNOWN:
 166                 puts("device type unknown\n");
 167                 return;
 168         default:
 169                 printf("Unhandled device type: %i\n", dev_desc->if_type);
 170                 return;
 171         }
 172         puts ("            Type: ");
 173         if (dev_desc->removable)
 174                 puts ("Removable ");
 175         switch (dev_desc->type & 0x1F) {
 176         case DEV_TYPE_HARDDISK:
 177                 puts ("Hard Disk");
 178                 break;
 179         case DEV_TYPE_CDROM:
 180                 puts ("CD ROM");
 181                 break;
 182         case DEV_TYPE_OPDISK:
 183                 puts ("Optical Device");
 184                 break;
 185         case DEV_TYPE_TAPE:
 186                 puts ("Tape");
 187                 break;
 188         default:
 189                 printf ("# %02X #", dev_desc->type & 0x1F);
 190                 break;
 191         }
 192         puts ("\n");
 193         if (dev_desc->lba > 0L && dev_desc->blksz > 0L) {
 194                 ulong mb, mb_quot, mb_rem, gb, gb_quot, gb_rem;
 195                 lbaint_t lba;
 196
 197                 lba = dev_desc->lba;
 198
 199                 lba512 = (lba * (dev_desc->blksz/512));
 200                 /* round to 1 digit */
 201                 /* 2048 = (1024 * 1024) / 512 MB */
 202                 mb = lba512_muldiv(lba512, 10, 11);
 203
 204                 mb_quot = mb / 10;
 205                 mb_rem  = mb - (10 * mb_quot);
 206
 207                 gb = mb / 1024;
 208                 gb_quot = gb / 10;
 209                 gb_rem  = gb - (10 * gb_quot);
 210 #ifdef CONFIG_LBA48
 211                 if (dev_desc->lba48)
 212                         printf ("            Supports 48-bit addressing\n");
 213 #endif
 214 #if defined(CONFIG_SYS_64BIT_LBA)
 215                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%llu x %lu)\n",
 216                         mb_quot, mb_rem,
 217                         gb_quot, gb_rem,
 218                         lba,
 219                         dev_desc->blksz);
 220 #else
 221                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%lu x %lu)\n",
 222                         mb_quot, mb_rem,
 223                         gb_quot, gb_rem,
 224                         (ulong)lba,
 225                         dev_desc->blksz);
 226 #endif
 227         } else {
 228                 puts ("            Capacity: not available\n");
 229         }
 230 }
 231 #endif
 232
 233 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 234
 235 void part_init(struct blk_desc *dev_desc)
 236 {
 237         struct part_driver *drv =
 238                 ll_entry_start(struct part_driver, part_driver);
 239         const int n_ents = ll_entry_count(struct part_driver, part_driver);
 240         struct part_driver *entry;
 241
 242         blkcache_invalidate(dev_desc->if_type, dev_desc->devnum);
 243
 244         dev_desc->part_type = PART_TYPE_UNKNOWN;
 245         for (entry = drv; entry != drv + n_ents; entry++) {
 246                 int ret;
 247
 248                 ret = entry->test(dev_desc);
 249                 debug("%s: try '%s': ret=%d\n", __func__, entry->name, ret);
 250                 if (!ret) {
 251                         dev_desc->part_type = entry->part_type;
 252                         break;
 253                 }
 254         }
 255 }
 256
 257 static void print_part_header(const char *type, struct blk_desc *dev_desc)
 258 {
 259 #if CONFIG_IS_ENABLED(MAC_PARTITION) || \
 260         CONFIG_IS_ENABLED(DOS_PARTITION) || \
 261         CONFIG_IS_ENABLED(ISO_PARTITION) || \
 262         CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
 263         CONFIG_IS_ENABLED(EFI_PARTITION)
 264         puts ("\nPartition Map for ");
 265         switch (dev_desc->if_type) {
 266         case IF_TYPE_IDE:
 267                 puts ("IDE");
 268                 break;
 269         case IF_TYPE_SATA:
 270                 puts ("SATA");
 271                 break;
 272         case IF_TYPE_SCSI:
 273                 puts ("SCSI");
 274                 break;
 275         case IF_TYPE_ATAPI:
 276                 puts ("ATAPI");
 277                 break;
 278         case IF_TYPE_USB:
 279                 puts ("USB");
 280                 break;
 281         case IF_TYPE_DOC:
 282                 puts ("DOC");
 283                 break;
 284         case IF_TYPE_MMC:
 285                 puts ("MMC");
 286                 break;
 287         case IF_TYPE_HOST:
 288                 puts ("HOST");
 289                 break;
 290         case IF_TYPE_NVME:
 291                 puts ("NVMe");
 292                 break;
 293         case IF_TYPE_PVBLOCK:
 294                 puts("PV BLOCK");
 295                 break;
 296         case IF_TYPE_VIRTIO:
 297                 puts("VirtIO");
 298                 break;
 299         default:
 300                 puts ("UNKNOWN");
 301                 break;
 302         }
 303         printf (" device %d  --   Partition Type: %s\n\n",
 304                         dev_desc->devnum, type);
 305 #endif /* any CONFIG_..._PARTITION */
 306 }
 307
 308 void part_print(struct blk_desc *dev_desc)
 309 {
 310         struct part_driver *drv;
 311
 312         drv = part_driver_lookup_type(dev_desc);
 313         if (!drv) {
 314                 printf("## Unknown partition table type %x\n",
 315                        dev_desc->part_type);
 316                 return;
 317         }
 318
 319         PRINTF("## Testing for valid %s partition ##\n", drv->name);
 320         print_part_header(drv->name, dev_desc);
 321         if (drv->print)
 322                 drv->print(dev_desc);
 323 }
 324
 325 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
 326
 327 int part_get_info(struct blk_desc *dev_desc, int part,
 328                        struct disk_partition *info)
 329 {
 330 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 331         struct part_driver *drv;
 332
 333 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 334         /* The common case is no UUID support */
 335         info->uuid[0] = 0;
 336 #endif
 337 #ifdef CONFIG_PARTITION_TYPE_GUID
 338         info->type_guid[0] = 0;
 339 #endif
 340
 341         drv = part_driver_lookup_type(dev_desc);
 342         if (!drv) {
 343                 debug("## Unknown partition table type %x\n",
 344                       dev_desc->part_type);
 345                 return -EPROTONOSUPPORT;
 346         }
 347         if (!drv->get_info) {
 348                 PRINTF("## Driver %s does not have the get_info() method\n",
 349                        drv->name);
 350                 return -ENOSYS;
 351         }
 352         if (drv->get_info(dev_desc, part, info) == 0) {
 353                 PRINTF("## Valid %s partition found ##\n", drv->name);
 354                 return 0;
 355         }
 356 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
 357
 358         return -ENOENT;
 359 }
 360
 361 int part_get_info_whole_disk(struct blk_desc *dev_desc,
 362                              struct disk_partition *info)
 363 {
 364         info->start = 0;
 365         info->size = dev_desc->lba;
 366         info->blksz = dev_desc->blksz;
 367         info->bootable = 0;
 368         strcpy((char *)info->type, BOOT_PART_TYPE);
 369         strcpy((char *)info->name, "Whole Disk");
 370 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 371         info->uuid[0] = 0;
 372 #endif
 373 #ifdef CONFIG_PARTITION_TYPE_GUID
 374         info->type_guid[0] = 0;
 375 #endif
 376
 377         return 0;
 378 }
 379
 380 int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str,
 381                           struct blk_desc **dev_desc)
 382 {
 383         char *ep;
 384         char *dup_str = NULL;
 385         const char *dev_str, *hwpart_str;
 386         int dev, hwpart;
 387
 388         hwpart_str = strchr(dev_hwpart_str, '.');
 389         if (hwpart_str) {
 390                 dup_str = strdup(dev_hwpart_str);
 391                 dup_str[hwpart_str - dev_hwpart_str] = 0;
 392                 dev_str = dup_str;
 393                 hwpart_str++;
 394         } else {
 395                 dev_str = dev_hwpart_str;
 396                 hwpart = 0;
 397         }
 398
 399         dev = simple_strtoul(dev_str, &ep, 16);
 400         if (*ep) {
 401                 printf("** Bad device specification %s %s **\n",
 402                        ifname, dev_str);
 403                 dev = -EINVAL;
 404                 goto cleanup;
 405         }
 406
 407         if (hwpart_str) {
 408                 hwpart = simple_strtoul(hwpart_str, &ep, 16);
 409                 if (*ep) {
 410                         printf("** Bad HW partition specification %s %s **\n",
 411                             ifname, hwpart_str);
 412                         dev = -EINVAL;
 413                         goto cleanup;
 414                 }
 415         }
 416
 417         *dev_desc = get_dev_hwpart(ifname, dev, hwpart);
 418         if (!(*dev_desc) || ((*dev_desc)->type == DEV_TYPE_UNKNOWN)) {
 419                 debug("** Bad device %s %s **\n", ifname, dev_hwpart_str);
 420                 dev = -ENODEV;
 421                 goto cleanup;
 422         }
 423
 424 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 425         /*
 426          * Updates the partition table for the specified hw partition.
 427          * Always should be done, otherwise hw partition 0 will return stale
 428          * data after displaying a non-zero hw partition.
 429          */
 430         part_init(*dev_desc);
 431 #endif
 432
 433 cleanup:
 434         free(dup_str);
 435         return dev;
 436 }
 437
 438 #define PART_UNSPECIFIED -2
 439 #define PART_AUTO -1
 440 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 441                              struct blk_desc **dev_desc,
 442                              struct disk_partition *info, int allow_whole_dev)
 443 {
 444         int ret;
 445         const char *part_str;
 446         char *dup_str = NULL;
 447         const char *dev_str;
 448         int dev;
 449         char *ep;
 450         int p;
 451         int part;
 452         struct disk_partition tmpinfo;
 453
 454 #ifdef CONFIG_SANDBOX
 455         /*
 456          * Special-case a pseudo block device "hostfs", to allow access to the
 457          * host's own filesystem.
 458          */
 459         if (0 == strcmp(ifname, "hostfs")) {
 460                 *dev_desc = NULL;
 461                 info->start = 0;
 462                 info->size = 0;
 463                 info->blksz = 0;
 464                 info->bootable = 0;
 465                 strcpy((char *)info->type, BOOT_PART_TYPE);
 466                 strcpy((char *)info->name, "Sandbox host");
 467 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 468                 info->uuid[0] = 0;
 469 #endif
 470 #ifdef CONFIG_PARTITION_TYPE_GUID
 471                 info->type_guid[0] = 0;
 472 #endif
 473
 474                 return 0;
 475         }
 476 #endif
 477
 478 #ifdef CONFIG_CMD_UBIFS
 479         /*
 480          * Special-case ubi, ubi goes through a mtd, rather than through
 481          * a regular block device.
 482          */
 483         if (0 == strcmp(ifname, "ubi")) {
 484                 if (!ubifs_is_mounted()) {
 485                         printf("UBIFS not mounted, use ubifsmount to mount volume first!\n");
 486                         return -EINVAL;
 487                 }
 488
 489                 *dev_desc = NULL;
 490                 memset(info, 0, sizeof(*info));
 491                 strcpy((char *)info->type, BOOT_PART_TYPE);
 492                 strcpy((char *)info->name, "UBI");
 493 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 494                 info->uuid[0] = 0;
 495 #endif
 496                 return 0;
 497         }
 498 #endif
 499
 500         /* If no dev_part_str, use bootdevice environment variable */
 501         if (!dev_part_str || !strlen(dev_part_str) ||
 502             !strcmp(dev_part_str, "-"))
 503                 dev_part_str = env_get("bootdevice");
 504
 505         /* If still no dev_part_str, it's an error */
 506         if (!dev_part_str) {
 507                 printf("** No device specified **\n");
 508                 ret = -ENODEV;
 509                 goto cleanup;
 510         }
 511
 512         /* Separate device and partition ID specification */
 513         part_str = strchr(dev_part_str, ':');
 514         if (part_str) {
 515                 dup_str = strdup(dev_part_str);
 516                 dup_str[part_str - dev_part_str] = 0;
 517                 dev_str = dup_str;
 518                 part_str++;
 519         } else {
 520                 dev_str = dev_part_str;
 521         }
 522
 523         /* Look up the device */
 524         dev = blk_get_device_by_str(ifname, dev_str, dev_desc);
 525         if (dev < 0) {
 526                 ret = dev;
 527                 goto cleanup;
 528         }
 529
 530         /* Convert partition ID string to number */
 531         if (!part_str || !*part_str) {
 532                 part = PART_UNSPECIFIED;
 533         } else if (!strcmp(part_str, "auto")) {
 534                 part = PART_AUTO;
 535         } else {
 536                 /* Something specified -> use exactly that */
 537                 part = (int)simple_strtoul(part_str, &ep, 16);
 538                 /*
 539                  * Less than whole string converted,
 540                  * or request for whole device, but caller requires partition.
 541                  */
 542                 if (*ep || (part == 0 && !allow_whole_dev)) {
 543                         printf("** Bad partition specification %s %s **\n",
 544                             ifname, dev_part_str);
 545                         ret = -ENOENT;
 546                         goto cleanup;
 547                 }
 548         }
 549
 550         /*
 551          * No partition table on device,
 552          * or user requested partition 0 (entire device).
 553          */
 554         if (((*dev_desc)->part_type == PART_TYPE_UNKNOWN) ||
 555             (part == 0)) {
 556                 if (!(*dev_desc)->lba) {
 557                         printf("** Bad device size - %s %s **\n", ifname,
 558                                dev_str);
 559                         ret = -EINVAL;
 560                         goto cleanup;
 561                 }
 562
 563                 /*
 564                  * If user specified a partition ID other than 0,
 565                  * or the calling command only accepts partitions,
 566                  * it's an error.
 567                  */
 568                 if ((part > 0) || (!allow_whole_dev)) {
 569                         printf("** No partition table - %s %s **\n", ifname,
 570                                dev_str);
 571                         ret = -EPROTONOSUPPORT;
 572                         goto cleanup;
 573                 }
 574
 575                 (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 576
 577                 part_get_info_whole_disk(*dev_desc, info);
 578
 579                 ret = 0;
 580                 goto cleanup;
 581         }
 582
 583         /*
 584          * Now there's known to be a partition table,
 585          * not specifying a partition means to pick partition 1.
 586          */
 587         if (part == PART_UNSPECIFIED)
 588                 part = 1;
 589
 590         /*
 591          * If user didn't specify a partition number, or did specify something
 592          * other than "auto", use that partition number directly.
 593          */
 594         if (part != PART_AUTO) {
 595                 ret = part_get_info(*dev_desc, part, info);
 596                 if (ret) {
 597                         printf("** Invalid partition %d **\n", part);
 598                         goto cleanup;
 599                 }
 600         } else {
 601                 /*
 602                  * Find the first bootable partition.
 603                  * If none are bootable, fall back to the first valid partition.
 604                  */
 605                 part = 0;
 606                 for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
 607                         ret = part_get_info(*dev_desc, p, info);
 608                         if (ret)
 609                                 continue;
 610
 611                         /*
 612                          * First valid partition, or new better partition?
 613                          * If so, save partition ID.
 614                          */
 615                         if (!part || info->bootable)
 616                                 part = p;
 617
 618                         /* Best possible partition? Stop searching. */
 619                         if (info->bootable)
 620                                 break;
 621
 622                         /*
 623                          * We now need to search further for best possible.
 624                          * If we what we just queried was the best so far,
 625                          * save the info since we over-write it next loop.
 626                          */
 627                         if (part == p)
 628                                 tmpinfo = *info;
 629                 }
 630                 /* If we found any acceptable partition */
 631                 if (part) {
 632                         /*
 633                          * If we searched all possible partition IDs,
 634                          * return the first valid partition we found.
 635                          */
 636                         if (p == MAX_SEARCH_PARTITIONS + 1)
 637                                 *info = tmpinfo;
 638                 } else {
 639                         printf("** No valid partitions found **\n");
 640                         goto cleanup;
 641                 }
 642         }
 643         if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
 644                 printf("** Invalid partition type \"%.32s\""
 645                         " (expect \"" BOOT_PART_TYPE "\")\n",
 646                         info->type);
 647                 ret  = -EINVAL;
 648                 goto cleanup;
 649         }
 650
 651         (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 652
 653         ret = part;
 654         goto cleanup;
 655
 656 cleanup:
 657         free(dup_str);
 658         return ret;
 659 }
 660
 661 int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
 662                                struct disk_partition *info, int part_type)
 663 {
 664         struct part_driver *part_drv;
 665         int ret;
 666         int i;
 667
 668         part_drv = part_driver_lookup_type(dev_desc);
 669         if (!part_drv)
 670                 return -1;
 671         for (i = 1; i < part_drv->max_entries; i++) {
 672                 ret = part_drv->get_info(dev_desc, i, info);
 673                 if (ret != 0) {
 674                         /* no more entries in table */
 675                         break;
 676                 }
 677                 if (strcmp(name, (const char *)info->name) == 0) {
 678                         /* matched */
 679                         return i;
 680                 }
 681         }
 682
 683         return -ENOENT;
 684 }
 685
 686 int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
 687                           struct disk_partition *info)
 688 {
 689         return part_get_info_by_name_type(dev_desc, name, info, PART_TYPE_ALL);
 690 }
 691
 692 /**
 693  * Get partition info from device number and partition name.
 694  *
 695  * Parse a device number and partition name string in the form of
 696  * "devicenum.hwpartnum#partition_name", for example "0.1#misc". devicenum and
 697  * hwpartnum are both optional, defaulting to 0. If the partition is found,
 698  * sets dev_desc and part_info accordingly with the information of the
 699  * partition with the given partition_name.
 700  *
 701  * @param[in] dev_iface Device interface
 702  * @param[in] dev_part_str Input string argument, like "0.1#misc"
 703  * @param[out] dev_desc Place to store the device description pointer
 704  * @param[out] part_info Place to store the partition information
 705  * @return 0 on success, or a negative on error
 706  */
 707 static int part_get_info_by_dev_and_name(const char *dev_iface,
 708                                          const char *dev_part_str,
 709                                          struct blk_desc **dev_desc,
 710                                          struct disk_partition *part_info)
 711 {
 712         char *dup_str = NULL;
 713         const char *dev_str, *part_str;
 714         int ret;
 715
 716         /* Separate device and partition name specification */
 717         if (dev_part_str)
 718                 part_str = strchr(dev_part_str, '#');
 719         else
 720                 part_str = NULL;
 721
 722         if (part_str) {
 723                 dup_str = strdup(dev_part_str);
 724                 dup_str[part_str - dev_part_str] = 0;
 725                 dev_str = dup_str;
 726                 part_str++;
 727         } else {
 728                 return -EINVAL;
 729         }
 730
 731         ret = blk_get_device_by_str(dev_iface, dev_str, dev_desc);
 732         if (ret < 0)
 733                 goto cleanup;
 734
 735         ret = part_get_info_by_name(*dev_desc, part_str, part_info);
 736         if (ret < 0)
 737                 printf("Could not find \"%s\" partition\n", part_str);
 738
 739 cleanup:
 740         free(dup_str);
 741         return ret;
 742 }
 743
 744 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 745                                          const char *dev_part_str,
 746                                          struct blk_desc **dev_desc,
 747                                          struct disk_partition *part_info,
 748                                          int allow_whole_dev)
 749 {
 750         int ret;
 751
 752         /* Split the part_name if passed as "$dev_num#part_name". */
 753         ret = part_get_info_by_dev_and_name(dev_iface, dev_part_str,
 754                                             dev_desc, part_info);
 755         if (ret >= 0)
 756                 return ret;
 757         /*
 758          * Couldn't lookup by name, try looking up the partition description
 759          * directly.
 760          */
 761         ret = blk_get_device_part_str(dev_iface, dev_part_str,
 762                                       dev_desc, part_info, allow_whole_dev);
 763         if (ret < 0)
 764                 printf("Couldn't find partition %s %s\n",
 765                        dev_iface, dev_part_str);
 766         return ret;
 767 }
 768
 769 void part_set_generic_name(const struct blk_desc *dev_desc,
 770         int part_num, char *name)
 771 {
 772         char *devtype;
 773
 774         switch (dev_desc->if_type) {
 775         case IF_TYPE_IDE:
 776         case IF_TYPE_SATA:
 777         case IF_TYPE_ATAPI:
 778                 devtype = "hd";
 779                 break;
 780         case IF_TYPE_SCSI:
 781                 devtype = "sd";
 782                 break;
 783         case IF_TYPE_USB:
 784                 devtype = "usbd";
 785                 break;
 786         case IF_TYPE_DOC:
 787                 devtype = "docd";
 788                 break;
 789         case IF_TYPE_MMC:
 790         case IF_TYPE_SD:
 791                 devtype = "mmcsd";
 792                 break;
 793         default:
 794                 devtype = "xx";
 795                 break;
 796         }
 797
 798         sprintf(name, "%s%c%d", devtype, 'a' + dev_desc->devnum, part_num);
 799 }