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