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
 227         dmt = dm_task_create(DM_DEVICE_INFO);
 228         if (!dmt)
 229                 return 1;
 230
 231         if (!dm_task_set_name (dmt, name))
 232                 goto uuidout;
 233
 234         if (!dm_task_run(dmt))
 235                 goto uuidout;
 236
 237         uuidtmp = dm_task_get_uuid(dmt);
 238         if (uuidtmp) {
 239                 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 240                         strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 241                 else
 242                         strcpy(uuid, uuidtmp);
 243         }
 244         else
 245                 uuid[0] = '\0';
 246
 247 uuidout:
 248         dm_task_destroy(dmt);
 249
 250         return 0;
 251 }
 252
 253 extern int
 254 dm_get_status(char * name, char * outstatus)
 255 {
 256         int r = 1;
 257         struct dm_task *dmt;
 258         void *next = NULL;
 259         uint64_t start, length;
 260         char *target_type;
 261         char *status;
 262
 263         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 264                 return 1;
 265
 266         if (!dm_task_set_name(dmt, name))
 267                 goto out;
 268
 269         dm_task_no_open_count(dmt);
 270
 271         if (!dm_task_run(dmt))
 272                 goto out;
 273
 274         /* Fetch 1st target */
 275         next = dm_get_next_target(dmt, next, &start, &length,
 276                                   &target_type, &status);
 277
 278         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 279                 r = 0;
 280 out:
 281         if (r)
 282                 condlog(0, "%s: error getting map status string", name);
 283
 284         dm_task_destroy(dmt);
 285         return r;
 286 }
 287
 288 /*
 289  * returns:
 290  *    1 : match
 291  *    0 : no match
 292  *   -1 : empty map
 293  */
 294 extern int
 295 dm_type(char * name, char * type)
 296 {
 297         int r = 0;
 298         struct dm_task *dmt;
 299         void *next = NULL;
 300         uint64_t start, length;
 301         char *target_type = NULL;
 302         char *params;
 303
 304         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 305                 return 0;
 306
 307         if (!dm_task_set_name(dmt, name))
 308                 goto out;
 309
 310         dm_task_no_open_count(dmt);
 311
 312         if (!dm_task_run(dmt))
 313                 goto out;
 314
 315         /* Fetch 1st target */
 316         next = dm_get_next_target(dmt, next, &start, &length,
 317                                   &target_type, &params);
 318
 319         if (!target_type)
 320                 r = -1;
 321         else if (!strcmp(target_type, type))
 322                 r = 1;
 323
 324 out:
 325         dm_task_destroy(dmt);
 326         return r;
 327 }
 328
 329 static int
 330 dm_dev_t (char * mapname, char * dev_t, int len)
 331 {
 332         int r = 1;
 333         struct dm_task *dmt;
 334         struct dm_info info;
 335
 336         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 337                 return 0;
 338
 339         if (!dm_task_set_name(dmt, mapname))
 340                 goto out;
 341
 342         if (!dm_task_run(dmt))
 343                 goto out;
 344
 345         if (!dm_task_get_info(dmt, &info))
 346                 goto out;
 347
 348         r = info.open_count;
 349         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 350                     goto out;
 351
 352         r = 0;
 353 out:
 354         dm_task_destroy(dmt);
 355         return r;
 356 }
 357
 358 int
 359 dm_get_opencount (char * mapname)
 360 {
 361         int r = -1;
 362         struct dm_task *dmt;
 363         struct dm_info info;
 364
 365         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 366                 return 0;
 367
 368         if (!dm_task_set_name(dmt, mapname))
 369                 goto out;
 370
 371         if (!dm_task_run(dmt))
 372                 goto out;
 373
 374         if (!dm_task_get_info(dmt, &info))
 375                 goto out;
 376
 377         r = info.open_count;
 378 out:
 379         dm_task_destroy(dmt);
 380         return r;
 381 }
 382
 383 int
 384 dm_get_minor (char * mapname)
 385 {
 386         int r = -1;
 387         struct dm_task *dmt;
 388         struct dm_info info;
 389
 390         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 391                 return 0;
 392
 393         if (!dm_task_set_name(dmt, mapname))
 394                 goto out;
 395
 396         if (!dm_task_run(dmt))
 397                 goto out;
 398
 399         if (!dm_task_get_info(dmt, &info))
 400                 goto out;
 401
 402         r = info.minor;
 403 out:
 404         dm_task_destroy(dmt);
 405         return r;
 406 }
 407
 408 extern int
 409 dm_flush_map (char * mapname, char * type)
 410 {
 411         int r;
 412
 413         if (!dm_map_present(mapname))
 414                 return 0;
 415
 416         if (dm_type(mapname, type) <= 0)
 417                 return 1;
 418
 419         if (dm_remove_partmaps(mapname))
 420                 return 1;
 421
 422         if (dm_get_opencount(mapname)) {
 423                 condlog(2, "%s: map in use", mapname);
 424                 return 1;
 425         }
 426
 427         r = dm_simplecmd(DM_DEVICE_REMOVE, mapname);
 428
 429         if (r) {
 430                 condlog(4, "multipath map %s removed", mapname);
 431                 return 0;
 432         }
 433         return 1;
 434 }
 435
 436 extern int
 437 dm_flush_maps (char * type)
 438 {
 439         int r = 0;
 440         struct dm_task *dmt;
 441         struct dm_names *names;
 442         unsigned next = 0;
 443
 444         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 445                 return 0;
 446
 447         dm_task_no_open_count(dmt);
 448
 449         if (!dm_task_run (dmt))
 450                 goto out;
 451
 452         if (!(names = dm_task_get_names (dmt)))
 453                 goto out;
 454
 455         if (!names->dev)
 456                 goto out;
 457
 458         do {
 459                 r += dm_flush_map(names->name, type);
 460                 next = names->next;
 461                 names = (void *) names + next;
 462         } while (next);
 463
 464         out:
 465         dm_task_destroy (dmt);
 466         return r;
 467 }
 468
 469 int
 470 dm_message(char * mapname, char * message)
 471 {
 472         int r = 1;
 473         struct dm_task *dmt;
 474
 475         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 476                 return 1;
 477
 478         if (!dm_task_set_name(dmt, mapname))
 479                 goto out;
 480
 481         if (!dm_task_set_sector(dmt, 0))
 482                 goto out;
 483
 484         if (!dm_task_set_message(dmt, message))
 485                 goto out;
 486
 487         dm_task_no_open_count(dmt);
 488
 489         if (!dm_task_run(dmt))
 490                 goto out;
 491
 492         r = 0;
 493 out:
 494         if (r)
 495                 condlog(0, "DM message failed [%s]", message);
 496
 497         dm_task_destroy(dmt);
 498         return r;
 499 }
 500
 501 int
 502 dm_fail_path(char * mapname, char * path)
 503 {
 504         char message[32];
 505
 506         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 507                 return 1;
 508
 509         return dm_message(mapname, message);
 510 }
 511
 512 int
 513 dm_reinstate_path(char * mapname, char * path)
 514 {
 515         char message[32];
 516
 517         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 518                 return 1;
 519
 520         return dm_message(mapname, message);
 521 }
 522
 523 int
 524 dm_queue_if_no_path(char *mapname, int enable)
 525 {
 526         char *message;
 527
 528         if (enable)
 529                 message = "queue_if_no_path\n";
 530         else
 531                 message = "fail_if_no_path\n";
 532
 533         return dm_message(mapname, message);
 534 }
 535
 536 static int
 537 dm_groupmsg (char * msg, char * mapname, int index)
 538 {
 539         char message[32];
 540
 541         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 542                 return 1;
 543
 544         return dm_message(mapname, message);
 545 }
 546
 547 int
 548 dm_switchgroup(char * mapname, int index)
 549 {
 550         return dm_groupmsg("switch", mapname, index);
 551 }
 552
 553 int
 554 dm_enablegroup(char * mapname, int index)
 555 {
 556         return dm_groupmsg("enable", mapname, index);
 557 }
 558
 559 int
 560 dm_disablegroup(char * mapname, int index)
 561 {
 562         return dm_groupmsg("disable", mapname, index);
 563 }
 564
 565 int
 566 dm_get_maps (vector mp, char * type)
 567 {
 568         struct multipath * mpp;
 569         int r = 1;
 570         int info;
 571         struct dm_task *dmt;
 572         struct dm_names *names;
 573         unsigned next = 0;
 574
 575         if (!type || !mp)
 576                 return 1;
 577
 578         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 579                 return 1;
 580
 581         dm_task_no_open_count(dmt);
 582
 583         if (!dm_task_run(dmt))
 584                 goto out;
 585
 586         if (!(names = dm_task_get_names(dmt)))
 587                 goto out;
 588
 589         if (!names->dev) {
 590                 r = 0; /* this is perfectly valid */
 591                 goto out;
 592         }
 593
 594         do {
 595                 info = dm_type(names->name, type);
 596
 597                 if (info <= 0)
 598                         goto next;
 599
 600                 mpp = alloc_multipath();
 601
 602                 if (!mpp)
 603                         goto out;
 604
 605                 mpp->alias = STRDUP(names->name);
 606
 607                 if (!mpp->alias)
 608                         goto out1;
 609
 610                 if (info > 0) {
 611                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 612                                 goto out1;
 613
 614                         if (dm_get_status(names->name, mpp->status))
 615                                 goto out1;
 616
 617                         dm_get_uuid(names->name, mpp->wwid);
 618                         dm_get_info(names->name, &mpp->dmi);
 619                 }
 620
 621                 if (!vector_alloc_slot(mp))
 622                         goto out1;
 623
 624                 vector_set_slot(mp, mpp);
 625                 mpp = NULL;
 626 next:
 627                 next = names->next;
 628                 names = (void *) names + next;
 629         } while (next);
 630
 631         r = 0;
 632         goto out;
 633 out1:
 634         free_multipath(mpp, KEEP_PATHS);
 635 out:
 636         dm_task_destroy (dmt);
 637         return r;
 638 }
 639
 640 extern int
 641 dm_get_name(char *uuid, char *type, char *name)
 642 {
 643         vector vec;
 644         struct multipath *mpp;
 645         int i;
 646
 647         vec = vector_alloc();
 648
 649         if (!vec)
 650                 return 0;
 651
 652         if (dm_get_maps(vec, type)) {
 653                 vector_free(vec);
 654                 return 0;
 655         }
 656
 657         vector_foreach_slot(vec, mpp, i) {
 658                 if (!strcmp(uuid, mpp->wwid)) {
 659                         vector_free(vec);
 660                         strcpy(name, mpp->alias);
 661                         return 1;
 662                 }
 663         }
 664
 665         vector_free(vec);
 666         return 0;
 667 }
 668
 669 int
 670 dm_geteventnr (char *name)
 671 {
 672         struct dm_task *dmt;
 673         struct dm_info info;
 674
 675         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 676                 return 0;
 677
 678         if (!dm_task_set_name(dmt, name))
 679                 goto out;
 680
 681         dm_task_no_open_count(dmt);
 682
 683         if (!dm_task_run(dmt))
 684                 goto out;
 685
 686         if (!dm_task_get_info(dmt, &info)) {
 687                 info.event_nr = 0;
 688                 goto out;
 689         }
 690
 691         if (!info.exists) {
 692                 info.event_nr = 0;
 693                 goto out;
 694         }
 695
 696 out:
 697         dm_task_destroy(dmt);
 698
 699         return info.event_nr;
 700 }
 701
 702 char *
 703 dm_mapname(int major, int minor)
 704 {
 705         char * response = NULL;
 706         const char *map;
 707         struct dm_task *dmt;
 708         int r;
 709         int loop = MAX_WAIT * LOOPS_PER_SEC;
 710
 711         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 712                 return NULL;
 713
 714         if (!dm_task_set_major(dmt, major) ||
 715             !dm_task_set_minor(dmt, minor))
 716                 goto bad;
 717
 718         dm_task_no_open_count(dmt);
 719
 720         /*
 721          * device map might not be ready when we get here from
 722          * daemon uev_trigger -> uev_add_map
 723          */
 724         while (--loop) {
 725                 dm_shut_log();
 726                 r = dm_task_run(dmt);
 727                 dm_restore_log();
 728
 729                 if (r)
 730                         break;
 731
 732                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 733         }
 734
 735         if (!r) {
 736                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 737                 goto bad;
 738         }
 739
 740         map = dm_task_get_name(dmt);
 741         if (map && strlen(map))
 742                 response = STRDUP((char *)dm_task_get_name(dmt));
 743
 744         dm_task_destroy(dmt);
 745         return response;
 746 bad:
 747         dm_task_destroy(dmt);
 748         condlog(0, "%i:%i: error fetching map name", major, minor);
 749         return NULL;
 750 }
 751
 752 int
 753 dm_remove_partmaps (char * mapname)
 754 {
 755         struct dm_task *dmt;
 756         struct dm_names *names;
 757         unsigned next = 0;
 758         char params[PARAMS_SIZE];
 759         unsigned long long size;
 760         char dev_t[32];
 761         int r = 1;
 762
 763         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 764                 return 1;
 765
 766         dm_task_no_open_count(dmt);
 767
 768         if (!dm_task_run(dmt))
 769                 goto out;
 770
 771         if (!(names = dm_task_get_names(dmt)))
 772                 goto out;
 773
 774         if (!names->dev) {
 775                 r = 0; /* this is perfectly valid */
 776                 goto out;
 777         }
 778
 779         if (dm_dev_t(mapname, &dev_t[0], 32))
 780                 goto out;
 781
 782         do {
 783                 if (
 784                     /*
 785                      * if devmap target is "linear"
 786                      */
 787                     (dm_type(names->name, "linear") > 0) &&
 788
 789                     /*
 790                      * and the multipath mapname and the part mapname start
 791                      * the same
 792                      */
 793                     !strncmp(names->name, mapname, strlen(mapname)) &&
 794
 795                     /*
 796                      * and the opencount is 0 for us to allow removal
 797                      */
 798                     !dm_get_opencount(names->name) &&
 799
 800                     /*
 801                      * and we can fetch the map table from the kernel
 802                      */
 803                     !dm_get_map(names->name, &size, &params[0]) &&
 804
 805                     /*
 806                      * and the table maps over the multipath map
 807                      */
 808                     strstr(params, dev_t)
 809                    ) {
 810                                 /*
 811                                  * then it's a kpartx generated partition.
 812                                  * remove it.
 813                                  */
 814                                 condlog(4, "partition map %s removed",
 815                                         names->name);
 816                                 dm_simplecmd(DM_DEVICE_REMOVE, names->name);
 817                    }
 818
 819                 next = names->next;
 820                 names = (void *) names + next;
 821         } while (next);
 822
 823         r = 0;
 824 out:
 825         dm_task_destroy (dmt);
 826         return r;
 827 }
 828
 829 static struct dm_info *
 830 alloc_dminfo (void)
 831 {
 832         return MALLOC(sizeof(struct dm_info));
 833 }
 834
 835 int
 836 dm_get_info (char * mapname, struct dm_info ** dmi)
 837 {
 838         int r = 1;
 839         struct dm_task *dmt = NULL;
 840
 841         if (!mapname)
 842                 return 1;
 843
 844         if (!*dmi)
 845                 *dmi = alloc_dminfo();
 846
 847         if (!*dmi)
 848                 return 1;
 849
 850         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 851                 goto out;
 852
 853         if (!dm_task_set_name(dmt, mapname))
 854                 goto out;
 855
 856         dm_task_no_open_count(dmt);
 857
 858         if (!dm_task_run(dmt))
 859                 goto out;
 860
 861         if (!dm_task_get_info(dmt, *dmi))
 862                 goto out;
 863
 864         r = 0;
 865 out:
 866         if (r)
 867                 memset(*dmi, 0, sizeof(struct dm_info));
 868
 869         if (dmt)
 870                 dm_task_destroy(dmt);
 871
 872         return r;
 873 }
 874
 875 int
 876 dm_rename_partmaps (char * old, char * new)
 877 {
 878         struct dm_task *dmt;
 879         struct dm_names *names;
 880         unsigned next = 0;
 881         char buff[PARAMS_SIZE];
 882         unsigned long long size;
 883         char dev_t[32];
 884         int r = 1;
 885
 886         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 887                 return 1;
 888
 889         dm_task_no_open_count(dmt);
 890
 891         if (!dm_task_run(dmt))
 892                 goto out;
 893
 894         if (!(names = dm_task_get_names(dmt)))
 895                 goto out;
 896
 897         if (!names->dev) {
 898                 r = 0; /* this is perfectly valid */
 899                 goto out;
 900         }
 901
 902         if (dm_dev_t(old, &dev_t[0], 32))
 903                 goto out;
 904
 905         do {
 906                 if (
 907                     /*
 908                      * if devmap target is "linear"
 909                      */
 910                     (dm_type(names->name, "linear") > 0) &&
 911
 912                     /*
 913                      * and the multipath mapname and the part mapname start
 914                      * the same
 915                      */
 916                     !strncmp(names->name, old, strlen(old)) &&
 917
 918                     /*
 919                      * and we can fetch the map table from the kernel
 920                      */
 921                     !dm_get_map(names->name, &size, &buff[0]) &&
 922
 923                     /*
 924                      * and the table maps over the multipath map
 925                      */
 926                     strstr(buff, dev_t)
 927                    ) {
 928                                 /*
 929                                  * then it's a kpartx generated partition.
 930                                  * Rename it.
 931                                  */
 932                                 snprintf(buff, PARAMS_SIZE, "%s%s",
 933                                          new, names->name + strlen(old));
 934                                 dm_rename(names->name, buff);
 935                                 condlog(4, "partition map %s renamed",
 936                                         names->name);
 937                    }
 938
 939                 next = names->next;
 940                 names = (void *) names + next;
 941         } while (next);
 942
 943         r = 0;
 944 out:
 945         dm_task_destroy (dmt);
 946         return r;
 947 }
 948
 949 int
 950 dm_rename (char * old, char * new)
 951 {
 952         int r = 0;
 953         struct dm_task *dmt;
 954
 955         if (dm_rename_partmaps(old, new))
 956                 return r;
 957
 958         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
 959                 return r;
 960
 961         if (!dm_task_set_name(dmt, old))
 962                 goto out;
 963
 964         if (!dm_task_set_newname(dmt, new))
 965                 goto out;
 966
 967         dm_task_no_open_count(dmt);
 968
 969         if (!dm_task_run(dmt))
 970                 goto out;
 971
 972         r = 1;
 973 out:
 974         dm_task_destroy(dmt);
 975         return r;
 976 }