libmultipath/devmapper.c

   1 /*
   2  * snippets copied from device-mapper dmsetup.c
   3  * Copyright (c) 2004, 2005 Christophe Varoqui
   4  * Copyright (c) 2005 Kiyoshi Ueda, NEC
   5  * Copyright (c) 2005 Patrick Caulfield, Redhat
   6  */
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <libdevmapper.h>
  11 #include <ctype.h>
  12 #include <linux/kdev_t.h>
  13 #include <unistd.h>
  14 #include <errno.h>
  15
  16 #include <checkers.h>
  17
  18 #include "vector.h"
  19 #include "structs.h"
  20 #include "debug.h"
  21 #include "memory.h"
  22 #include "devmapper.h"
  23
  24 #define MAX_WAIT 5
  25 #define LOOPS_PER_SEC 5
  26
  27 #define UUID_PREFIX "mpath-"
  28 #define UUID_PREFIX_LEN 6
  29
  30
  31 static void
  32 dm_dummy_log (int level, const char *file, int line, const char *f, ...)
  33 {
  34         return;
  35 }
  36
  37 void
  38 dm_restore_log (void)
  39 {
  40         dm_log_init(NULL);
  41 }
  42
  43 void
  44 dm_shut_log (void)
  45 {
  46         dm_log_init(&dm_dummy_log);
  47 }
  48
  49 extern int
  50 dm_prereq (char * str, int x, int y, int z)
  51 {
  52         int r = 2;
  53         struct dm_task *dmt;
  54         struct dm_versions *target;
  55         struct dm_versions *last_target;
  56
  57         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
  58                 return 3;
  59
  60         dm_task_no_open_count(dmt);
  61
  62         if (!dm_task_run(dmt)) {
  63                 condlog(0, "Can not communicate with kernel DM");
  64                 goto out;
  65         }
  66
  67         target = dm_task_get_versions(dmt);
  68
  69         do {
  70                 last_target = target;
  71
  72                 if (!strncmp(str, target->name, strlen(str))) {
  73                         r--;
  74
  75                         if (target->version[0] >= x &&
  76                             target->version[1] >= y &&
  77                             target->version[2] >= z)
  78                                 r--;
  79
  80                         break;
  81                 }
  82
  83                 target = (void *) target + target->next;
  84         } while (last_target != target);
  85
  86         if (r == 2)
  87                 condlog(0, "DM multipath kernel driver not loaded");
  88         else if (r == 1)
  89                 condlog(0, "DM multipath kernel driver version too old");
  90
  91 out:
  92         dm_task_destroy(dmt);
  93         return r;
  94 }
  95
  96 extern int
  97 dm_simplecmd (int task, const char *name) {
  98         int r = 0;
  99         struct dm_task *dmt;
 100
 101         if (!(dmt = dm_task_create (task)))
 102                 return 0;
 103
 104         if (!dm_task_set_name (dmt, name))
 105                 goto out;
 106
 107         dm_task_no_open_count(dmt);
 108         dm_task_skip_lockfs(dmt);       /* for DM_DEVICE_RESUME */
 109
 110         r = dm_task_run (dmt);
 111
 112         out:
 113         dm_task_destroy (dmt);
 114         return r;
 115 }
 116
 117 extern int
 118 dm_addmap (int task, const char *name, const char *target,
 119            const char *params, unsigned long long size, const char *uuid) {
 120         int r = 0;
 121         struct dm_task *dmt;
 122         char *prefixed_uuid = NULL;
 123
 124         if (!(dmt = dm_task_create (task)))
 125                 return 0;
 126
 127         if (!dm_task_set_name (dmt, name))
 128                 goto addout;
 129
 130         if (!dm_task_add_target (dmt, 0, size, target, params))
 131                 goto addout;
 132
 133         if (uuid){
 134                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
 135                 if (!prefixed_uuid) {
 136                         condlog(0, "cannot create prefixed uuid : %s\n",
 137                                 strerror(errno));
 138                         goto addout;
 139                 }
 140                 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
 141                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 142                         goto freeout;
 143         }
 144
 145         dm_task_no_open_count(dmt);
 146
 147         r = dm_task_run (dmt);
 148
 149         freeout:
 150         if (prefixed_uuid)
 151                 free(prefixed_uuid);
 152
 153         addout:
 154         dm_task_destroy (dmt);
 155         return r;
 156 }
 157
 158 extern int
 159 dm_map_present (char * str)
 160 {
 161         int r = 0;
 162         struct dm_task *dmt;
 163         struct dm_info info;
 164
 165         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 166                 return 0;
 167
 168         if (!dm_task_set_name(dmt, str))
 169                 goto out;
 170
 171         dm_task_no_open_count(dmt);
 172
 173         if (!dm_task_run(dmt))
 174                 goto out;
 175
 176         if (!dm_task_get_info(dmt, &info))
 177                 goto out;
 178
 179         if (info.exists)
 180                 r = 1;
 181 out:
 182         dm_task_destroy(dmt);
 183         return r;
 184 }
 185
 186 extern int
 187 dm_get_map(char * name, unsigned long long * size, char * outparams)
 188 {
 189         int r = 1;
 190         struct dm_task *dmt;
 191         void *next = NULL;
 192         uint64_t start, length;
 193         char *target_type = NULL;
 194         char *params = NULL;
 195
 196         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 197                 return 1;
 198
 199         if (!dm_task_set_name(dmt, name))
 200                 goto out;
 201
 202         dm_task_no_open_count(dmt);
 203
 204         if (!dm_task_run(dmt))
 205                 goto out;
 206
 207         /* Fetch 1st target */
 208         next = dm_get_next_target(dmt, next, &start, &length,
 209                                   &target_type, &params);
 210
 211         if (size)
 212                 *size = length;
 213
 214         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 215                 r = 0;
 216 out:
 217         dm_task_destroy(dmt);
 218         return r;
 219 }
 220
 221 extern int
 222 dm_get_uuid(char *name, char *uuid)
 223 {
 224         struct dm_task *dmt;
 225         const char *uuidtmp;
 226         int r = 1;
 227
 228         dmt = dm_task_create(DM_DEVICE_INFO);
 229         if (!dmt)
 230                 return 1;
 231
 232         if (!dm_task_set_name (dmt, name))
 233                 goto uuidout;
 234
 235         if (!dm_task_run(dmt))
 236                 goto uuidout;
 237
 238         uuidtmp = dm_task_get_uuid(dmt);
 239         if (uuidtmp) {
 240                 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 241                         strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 242                 else
 243                         strcpy(uuid, uuidtmp);
 244         }
 245         else
 246                 uuid[0] = '\0';
 247
 248         r = 0;
 249 uuidout:
 250         dm_task_destroy(dmt);
 251         return r;
 252 }
 253
 254 extern int
 255 dm_get_status(char * name, char * outstatus)
 256 {
 257         int r = 1;
 258         struct dm_task *dmt;
 259         void *next = NULL;
 260         uint64_t start, length;
 261         char *target_type;
 262         char *status;
 263
 264         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 265                 return 1;
 266
 267         if (!dm_task_set_name(dmt, name))
 268                 goto out;
 269
 270         dm_task_no_open_count(dmt);
 271
 272         if (!dm_task_run(dmt))
 273                 goto out;
 274
 275         /* Fetch 1st target */
 276         next = dm_get_next_target(dmt, next, &start, &length,
 277                                   &target_type, &status);
 278
 279         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 280                 r = 0;
 281 out:
 282         if (r)
 283                 condlog(0, "%s: error getting map status string", name);
 284
 285         dm_task_destroy(dmt);
 286         return r;
 287 }
 288
 289 /*
 290  * returns:
 291  *    1 : match
 292  *    0 : no match
 293  *   -1 : empty map
 294  */
 295 extern int
 296 dm_type(char * name, char * type)
 297 {
 298         int r = 0;
 299         struct dm_task *dmt;
 300         void *next = NULL;
 301         uint64_t start, length;
 302         char *target_type = NULL;
 303         char *params;
 304
 305         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 306                 return 0;
 307
 308         if (!dm_task_set_name(dmt, name))
 309                 goto out;
 310
 311         dm_task_no_open_count(dmt);
 312
 313         if (!dm_task_run(dmt))
 314                 goto out;
 315
 316         /* Fetch 1st target */
 317         next = dm_get_next_target(dmt, next, &start, &length,
 318                                   &target_type, &params);
 319
 320         if (!target_type)
 321                 r = -1;
 322         else if (!strcmp(target_type, type))
 323                 r = 1;
 324
 325 out:
 326         dm_task_destroy(dmt);
 327         return r;
 328 }
 329
 330 static int
 331 dm_dev_t (char * mapname, char * dev_t, int len)
 332 {
 333         int r = 1;
 334         struct dm_task *dmt;
 335         struct dm_info info;
 336
 337         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 338                 return 0;
 339
 340         if (!dm_task_set_name(dmt, mapname))
 341                 goto out;
 342
 343         if (!dm_task_run(dmt))
 344                 goto out;
 345
 346         if (!dm_task_get_info(dmt, &info))
 347                 goto out;
 348
 349         r = info.open_count;
 350         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 351                     goto out;
 352
 353         r = 0;
 354 out:
 355         dm_task_destroy(dmt);
 356         return r;
 357 }
 358
 359 int
 360 dm_get_opencount (char * mapname)
 361 {
 362         int r = -1;
 363         struct dm_task *dmt;
 364         struct dm_info info;
 365
 366         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 367                 return 0;
 368
 369         if (!dm_task_set_name(dmt, mapname))
 370                 goto out;
 371
 372         if (!dm_task_run(dmt))
 373                 goto out;
 374
 375         if (!dm_task_get_info(dmt, &info))
 376                 goto out;
 377
 378         r = info.open_count;
 379 out:
 380         dm_task_destroy(dmt);
 381         return r;
 382 }
 383
 384 int
 385 dm_get_minor (char * mapname)
 386 {
 387         int r = -1;
 388         struct dm_task *dmt;
 389         struct dm_info info;
 390
 391         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 392                 return 0;
 393
 394         if (!dm_task_set_name(dmt, mapname))
 395                 goto out;
 396
 397         if (!dm_task_run(dmt))
 398                 goto out;
 399
 400         if (!dm_task_get_info(dmt, &info))
 401                 goto out;
 402
 403         r = info.minor;
 404 out:
 405         dm_task_destroy(dmt);
 406         return r;
 407 }
 408
 409 extern int
 410 dm_flush_map (char * mapname, char * type)
 411 {
 412         int r;
 413
 414         if (!dm_map_present(mapname))
 415                 return 0;
 416
 417         if (dm_type(mapname, type) <= 0)
 418                 return 1;
 419
 420         if (dm_remove_partmaps(mapname))
 421                 return 1;
 422
 423         if (dm_get_opencount(mapname)) {
 424                 condlog(2, "%s: map in use", mapname);
 425                 return 1;
 426         }
 427
 428         r = dm_simplecmd(DM_DEVICE_REMOVE, mapname);
 429
 430         if (r) {
 431                 condlog(4, "multipath map %s removed", mapname);
 432                 return 0;
 433         }
 434         return 1;
 435 }
 436
 437 extern int
 438 dm_flush_maps (char * type)
 439 {
 440         int r = 0;
 441         struct dm_task *dmt;
 442         struct dm_names *names;
 443         unsigned next = 0;
 444
 445         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 446                 return 0;
 447
 448         dm_task_no_open_count(dmt);
 449
 450         if (!dm_task_run (dmt))
 451                 goto out;
 452
 453         if (!(names = dm_task_get_names (dmt)))
 454                 goto out;
 455
 456         if (!names->dev)
 457                 goto out;
 458
 459         do {
 460                 r += dm_flush_map(names->name, type);
 461                 next = names->next;
 462                 names = (void *) names + next;
 463         } while (next);
 464
 465         out:
 466         dm_task_destroy (dmt);
 467         return r;
 468 }
 469
 470 int
 471 dm_message(char * mapname, char * message)
 472 {
 473         int r = 1;
 474         struct dm_task *dmt;
 475
 476         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 477                 return 1;
 478
 479         if (!dm_task_set_name(dmt, mapname))
 480                 goto out;
 481
 482         if (!dm_task_set_sector(dmt, 0))
 483                 goto out;
 484
 485         if (!dm_task_set_message(dmt, message))
 486                 goto out;
 487
 488         dm_task_no_open_count(dmt);
 489
 490         if (!dm_task_run(dmt))
 491                 goto out;
 492
 493         r = 0;
 494 out:
 495         if (r)
 496                 condlog(0, "DM message failed [%s]", message);
 497
 498         dm_task_destroy(dmt);
 499         return r;
 500 }
 501
 502 int
 503 dm_fail_path(char * mapname, char * path)
 504 {
 505         char message[32];
 506
 507         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 508                 return 1;
 509
 510         return dm_message(mapname, message);
 511 }
 512
 513 int
 514 dm_reinstate_path(char * mapname, char * path)
 515 {
 516         char message[32];
 517
 518         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 519                 return 1;
 520
 521         return dm_message(mapname, message);
 522 }
 523
 524 int
 525 dm_queue_if_no_path(char *mapname, int enable)
 526 {
 527         char *message;
 528
 529         if (enable)
 530                 message = "queue_if_no_path\n";
 531         else
 532                 message = "fail_if_no_path\n";
 533
 534         return dm_message(mapname, message);
 535 }
 536
 537 static int
 538 dm_groupmsg (char * msg, char * mapname, int index)
 539 {
 540         char message[32];
 541
 542         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 543                 return 1;
 544
 545         return dm_message(mapname, message);
 546 }
 547
 548 int
 549 dm_switchgroup(char * mapname, int index)
 550 {
 551         return dm_groupmsg("switch", mapname, index);
 552 }
 553
 554 int
 555 dm_enablegroup(char * mapname, int index)
 556 {
 557         return dm_groupmsg("enable", mapname, index);
 558 }
 559
 560 int
 561 dm_disablegroup(char * mapname, int index)
 562 {
 563         return dm_groupmsg("disable", mapname, index);
 564 }
 565
 566 int
 567 dm_get_maps (vector mp, char * type)
 568 {
 569         struct multipath * mpp;
 570         int r = 1;
 571         int info;
 572         struct dm_task *dmt;
 573         struct dm_names *names;
 574         unsigned next = 0;
 575
 576         if (!type || !mp)
 577                 return 1;
 578
 579         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 580                 return 1;
 581
 582         dm_task_no_open_count(dmt);
 583
 584         if (!dm_task_run(dmt))
 585                 goto out;
 586
 587         if (!(names = dm_task_get_names(dmt)))
 588                 goto out;
 589
 590         if (!names->dev) {
 591                 r = 0; /* this is perfectly valid */
 592                 goto out;
 593         }
 594
 595         do {
 596                 info = dm_type(names->name, type);
 597
 598                 if (info <= 0)
 599                         goto next;
 600
 601                 mpp = alloc_multipath();
 602
 603                 if (!mpp)
 604                         goto out;
 605
 606                 mpp->alias = STRDUP(names->name);
 607
 608                 if (!mpp->alias)
 609                         goto out1;
 610
 611                 if (info > 0) {
 612                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 613                                 goto out1;
 614
 615                         if (dm_get_status(names->name, mpp->status))
 616                                 goto out1;
 617
 618                         dm_get_uuid(names->name, mpp->wwid);
 619                         dm_get_info(names->name, &mpp->dmi);
 620                 }
 621
 622                 if (!vector_alloc_slot(mp))
 623                         goto out1;
 624
 625                 vector_set_slot(mp, mpp);
 626                 mpp = NULL;
 627 next:
 628                 next = names->next;
 629                 names = (void *) names + next;
 630         } while (next);
 631
 632         r = 0;
 633         goto out;
 634 out1:
 635         free_multipath(mpp, KEEP_PATHS);
 636 out:
 637         dm_task_destroy (dmt);
 638         return r;
 639 }
 640
 641 extern int
 642 dm_get_name(char *uuid, char *type, char *name)
 643 {
 644         vector vec;
 645         struct multipath *mpp;
 646         int i;
 647
 648         vec = vector_alloc();
 649
 650         if (!vec)
 651                 return 0;
 652
 653         if (dm_get_maps(vec, type)) {
 654                 vector_free(vec);
 655                 return 0;
 656         }
 657
 658         vector_foreach_slot(vec, mpp, i) {
 659                 if (!strcmp(uuid, mpp->wwid)) {
 660                         vector_free(vec);
 661                         strcpy(name, mpp->alias);
 662                         return 1;
 663                 }
 664         }
 665
 666         vector_free(vec);
 667         return 0;
 668 }
 669
 670 int
 671 dm_geteventnr (char *name)
 672 {
 673         struct dm_task *dmt;
 674         struct dm_info info;
 675
 676         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 677                 return 0;
 678
 679         if (!dm_task_set_name(dmt, name))
 680                 goto out;
 681
 682         dm_task_no_open_count(dmt);
 683
 684         if (!dm_task_run(dmt))
 685                 goto out;
 686
 687         if (!dm_task_get_info(dmt, &info)) {
 688                 info.event_nr = 0;
 689                 goto out;
 690         }
 691
 692         if (!info.exists) {
 693                 info.event_nr = 0;
 694                 goto out;
 695         }
 696
 697 out:
 698         dm_task_destroy(dmt);
 699
 700         return info.event_nr;
 701 }
 702
 703 char *
 704 dm_mapname(int major, int minor)
 705 {
 706         char * response = NULL;
 707         const char *map;
 708         struct dm_task *dmt;
 709         int r;
 710         int loop = MAX_WAIT * LOOPS_PER_SEC;
 711
 712         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 713                 return NULL;
 714
 715         if (!dm_task_set_major(dmt, major) ||
 716             !dm_task_set_minor(dmt, minor))
 717                 goto bad;
 718
 719         dm_task_no_open_count(dmt);
 720
 721         /*
 722          * device map might not be ready when we get here from
 723          * daemon uev_trigger -> uev_add_map
 724          */
 725         while (--loop) {
 726                 dm_shut_log();
 727                 r = dm_task_run(dmt);
 728                 dm_restore_log();
 729
 730                 if (r)
 731                         break;
 732
 733                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 734         }
 735
 736         if (!r) {
 737                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 738                 goto bad;
 739         }
 740
 741         map = dm_task_get_name(dmt);
 742         if (map && strlen(map))
 743                 response = STRDUP((char *)dm_task_get_name(dmt));
 744
 745         dm_task_destroy(dmt);
 746         return response;
 747 bad:
 748         dm_task_destroy(dmt);
 749         condlog(0, "%i:%i: error fetching map name", major, minor);
 750         return NULL;
 751 }
 752
 753 int
 754 dm_remove_partmaps (char * mapname)
 755 {
 756         struct dm_task *dmt;
 757         struct dm_names *names;
 758         unsigned next = 0;
 759         char params[PARAMS_SIZE];
 760         unsigned long long size;
 761         char dev_t[32];
 762         int r = 1;
 763
 764         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 765                 return 1;
 766
 767         dm_task_no_open_count(dmt);
 768
 769         if (!dm_task_run(dmt))
 770                 goto out;
 771
 772         if (!(names = dm_task_get_names(dmt)))
 773                 goto out;
 774
 775         if (!names->dev) {
 776                 r = 0; /* this is perfectly valid */
 777                 goto out;
 778         }
 779
 780         if (dm_dev_t(mapname, &dev_t[0], 32))
 781                 goto out;
 782
 783         do {
 784                 if (
 785                     /*
 786                      * if devmap target is "linear"
 787                      */
 788                     (dm_type(names->name, "linear") > 0) &&
 789
 790                     /*
 791                      * and the multipath mapname and the part mapname start
 792                      * the same
 793                      */
 794                     !strncmp(names->name, mapname, strlen(mapname)) &&
 795
 796                     /*
 797                      * and the opencount is 0 for us to allow removal
 798                      */
 799                     !dm_get_opencount(names->name) &&
 800
 801                     /*
 802                      * and we can fetch the map table from the kernel
 803                      */
 804                     !dm_get_map(names->name, &size, &params[0]) &&
 805
 806                     /*
 807                      * and the table maps over the multipath map
 808                      */
 809                     strstr(params, dev_t)
 810                    ) {
 811                                 /*
 812                                  * then it's a kpartx generated partition.
 813                                  * remove it.
 814                                  */
 815                                 condlog(4, "partition map %s removed",
 816                                         names->name);
 817                                 dm_simplecmd(DM_DEVICE_REMOVE, names->name);
 818                    }
 819
 820                 next = names->next;
 821                 names = (void *) names + next;
 822         } while (next);
 823
 824         r = 0;
 825 out:
 826         dm_task_destroy (dmt);
 827         return r;
 828 }
 829
 830 static struct dm_info *
 831 alloc_dminfo (void)
 832 {
 833         return MALLOC(sizeof(struct dm_info));
 834 }
 835
 836 int
 837 dm_get_info (char * mapname, struct dm_info ** dmi)
 838 {
 839         int r = 1;
 840         struct dm_task *dmt = NULL;
 841
 842         if (!mapname)
 843                 return 1;
 844
 845         if (!*dmi)
 846                 *dmi = alloc_dminfo();
 847
 848         if (!*dmi)
 849                 return 1;
 850
 851         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 852                 goto out;
 853
 854         if (!dm_task_set_name(dmt, mapname))
 855                 goto out;
 856
 857         dm_task_no_open_count(dmt);
 858
 859         if (!dm_task_run(dmt))
 860                 goto out;
 861
 862         if (!dm_task_get_info(dmt, *dmi))
 863                 goto out;
 864
 865         r = 0;
 866 out:
 867         if (r)
 868                 memset(*dmi, 0, sizeof(struct dm_info));
 869
 870         if (dmt)
 871                 dm_task_destroy(dmt);
 872
 873         return r;
 874 }
 875
 876 int
 877 dm_rename_partmaps (char * old, char * new)
 878 {
 879         struct dm_task *dmt;
 880         struct dm_names *names;
 881         unsigned next = 0;
 882         char buff[PARAMS_SIZE];
 883         unsigned long long size;
 884         char dev_t[32];
 885         int r = 1;
 886
 887         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 888                 return 1;
 889
 890         dm_task_no_open_count(dmt);
 891
 892         if (!dm_task_run(dmt))
 893                 goto out;
 894
 895         if (!(names = dm_task_get_names(dmt)))
 896                 goto out;
 897
 898         if (!names->dev) {
 899                 r = 0; /* this is perfectly valid */
 900                 goto out;
 901         }
 902
 903         if (dm_dev_t(old, &dev_t[0], 32))
 904                 goto out;
 905
 906         do {
 907                 if (
 908                     /*
 909                      * if devmap target is "linear"
 910                      */
 911                     (dm_type(names->name, "linear") > 0) &&
 912
 913                     /*
 914                      * and the multipath mapname and the part mapname start
 915                      * the same
 916                      */
 917                     !strncmp(names->name, old, strlen(old)) &&
 918
 919                     /*
 920                      * and we can fetch the map table from the kernel
 921                      */
 922                     !dm_get_map(names->name, &size, &buff[0]) &&
 923
 924                     /*
 925                      * and the table maps over the multipath map
 926                      */
 927                     strstr(buff, dev_t)
 928                    ) {
 929                                 /*
 930                                  * then it's a kpartx generated partition.
 931                                  * Rename it.
 932                                  */
 933                                 snprintf(buff, PARAMS_SIZE, "%s%s",
 934                                          new, names->name + strlen(old));
 935                                 dm_rename(names->name, buff);
 936                                 condlog(4, "partition map %s renamed",
 937                                         names->name);
 938                    }
 939
 940                 next = names->next;
 941                 names = (void *) names + next;
 942         } while (next);
 943
 944         r = 0;
 945 out:
 946         dm_task_destroy (dmt);
 947         return r;
 948 }
 949
 950 int
 951 dm_rename (char * old, char * new)
 952 {
 953         int r = 0;
 954         struct dm_task *dmt;
 955
 956         if (dm_rename_partmaps(old, new))
 957                 return r;
 958
 959         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
 960                 return r;
 961
 962         if (!dm_task_set_name(dmt, old))
 963                 goto out;
 964
 965         if (!dm_task_set_newname(dmt, new))
 966                 goto out;
 967
 968         dm_task_no_open_count(dmt);
 969
 970         if (!dm_task_run(dmt))
 971                 goto out;
 972
 973         r = 1;
 974 out:
 975         dm_task_destroy(dmt);
 976         return r;
 977 }