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