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 <stdarg.h>
  10 #include <string.h>
  11 #include <libdevmapper.h>
  12 #include <ctype.h>
  13 #include <linux/kdev_t.h>
  14 #include <unistd.h>
  15 #include <errno.h>
  16
  17 #include "checkers.h"
  18 #include "vector.h"
  19 #include "structs.h"
  20 #include "debug.h"
  21 #include "memory.h"
  22 #include "devmapper.h"
  23 #include "config.h"
  24
  25 #include "log_pthread.h"
  26 #include <sys/types.h>
  27 #include <time.h>
  28
  29 #define MAX_WAIT 5
  30 #define LOOPS_PER_SEC 5
  31
  32 #define UUID_PREFIX "mpath-"
  33 #define UUID_PREFIX_LEN 6
  34
  35 static void
  36 dm_write_log (int level, const char *file, int line, const char *f, ...)
  37 {
  38         va_list ap;
  39         int thres;
  40
  41         if (level > 6)
  42                 level = 6;
  43
  44         thres = (conf) ? conf->verbosity : 0;
  45         if (thres <= 3 || level > thres)
  46                 return;
  47
  48         va_start(ap, f);
  49         if (!logsink) {
  50                 time_t t = time(NULL);
  51                 struct tm *tb = localtime(&t);
  52                 char buff[16];
  53
  54                 strftime(buff, sizeof(buff), "%b %d %H:%M:%S", tb);
  55                 buff[sizeof(buff)-1] = '\0';
  56
  57                 fprintf(stdout, "%s | ", buff);
  58                 fprintf(stdout, "libdevmapper: %s(%i): ", file, line);
  59                 vfprintf(stdout, f, ap);
  60                 fprintf(stdout, "\n");
  61         } else {
  62                 condlog(level, "libdevmapper: %s(%i): ", file, line);
  63                 log_safe(level + 3, f, ap);
  64         }
  65         va_end(ap);
  66
  67         return;
  68 }
  69
  70 extern void
  71 dm_init(void) {
  72         dm_log_init(&dm_write_log);
  73         dm_log_init_verbose(conf ? conf->verbosity + 3 : 0);
  74 }
  75
  76 static int
  77 dm_libprereq (void)
  78 {
  79         char version[64];
  80         int v[3];
  81         int minv[3] = {1, 2, 8};
  82
  83         dm_get_library_version(version, sizeof(version));
  84         condlog(3, "libdevmapper version %s", version);
  85         sscanf(version, "%d.%d.%d ", &v[0], &v[1], &v[2]);
  86
  87         if ((v[0] > minv[0]) ||
  88             ((v[0] ==  minv[0]) && (v[1] > minv[1])) ||
  89             ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2])))
  90                 return 0;
  91         condlog(0, "libdevmapper version must be >= %d.%.2d.%.2d",
  92                 minv[0], minv[1], minv[2]);
  93         return 1;
  94 }
  95
  96 static int
  97 dm_drvprereq (char * str)
  98 {
  99         int r = 2;
 100         struct dm_task *dmt;
 101         struct dm_versions *target;
 102         struct dm_versions *last_target;
 103         int minv[3] = {1, 0, 3};
 104         unsigned int *v;
 105
 106         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 107                 return 3;
 108
 109         dm_task_no_open_count(dmt);
 110
 111         if (!dm_task_run(dmt)) {
 112                 condlog(0, "Can not communicate with kernel DM");
 113                 goto out;
 114         }
 115         target = dm_task_get_versions(dmt);
 116
 117         do {
 118                 last_target = target;
 119                 if (!strncmp(str, target->name, strlen(str))) {
 120                         r = 1;
 121                         break;
 122                 }
 123                 target = (void *) target + target->next;
 124         } while (last_target != target);
 125
 126         if (r == 2) {
 127                 condlog(0, "DM multipath kernel driver not loaded");
 128                 goto out;
 129         }
 130         v = target->version;
 131         if ((v[0] > minv[0]) ||
 132             ((v[0] == minv[0]) && (v[1] > minv[1])) ||
 133             ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2]))) {
 134                 r = 0;
 135                 goto out;
 136         }
 137         condlog(0, "DM multipath kernel driver must be >= %u.%.2u.%.2u",
 138                 minv[0], minv[1], minv[2]);
 139 out:
 140         dm_task_destroy(dmt);
 141         return r;
 142 }
 143
 144 extern int
 145 dm_prereq (char * str)
 146 {
 147         if (dm_libprereq())
 148                 return 1;
 149         return dm_drvprereq(str);
 150 }
 151
 152 extern int
 153 dm_simplecmd (int task, const char *name) {
 154         int r = 0;
 155         struct dm_task *dmt;
 156
 157         if (!(dmt = dm_task_create (task)))
 158                 return 0;
 159
 160         if (!dm_task_set_name (dmt, name))
 161                 goto out;
 162
 163         dm_task_no_open_count(dmt);
 164         dm_task_skip_lockfs(dmt);       /* for DM_DEVICE_RESUME */
 165 #ifdef LIBDM_API_FLUSH
 166         dm_task_no_flush(dmt);          /* for DM_DEVICE_SUSPEND/RESUME */
 167 #endif
 168
 169         r = dm_task_run (dmt);
 170
 171         out:
 172         dm_task_destroy (dmt);
 173         return r;
 174 }
 175
 176 extern int
 177 dm_addmap (int task, const char *name, const char *target,
 178            const char *params, unsigned long long size, const char *uuid) {
 179         int r = 0;
 180         struct dm_task *dmt;
 181         char *prefixed_uuid = NULL;
 182
 183         if (!(dmt = dm_task_create (task)))
 184                 return 0;
 185
 186         if (!dm_task_set_name (dmt, name))
 187                 goto addout;
 188
 189         if (!dm_task_add_target (dmt, 0, size, target, params))
 190                 goto addout;
 191
 192         if (uuid){
 193                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
 194                 if (!prefixed_uuid) {
 195                         condlog(0, "cannot create prefixed uuid : %s\n",
 196                                 strerror(errno));
 197                         goto addout;
 198                 }
 199                 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
 200                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 201                         goto freeout;
 202         }
 203
 204         dm_task_no_open_count(dmt);
 205
 206         r = dm_task_run (dmt);
 207
 208         freeout:
 209         if (prefixed_uuid)
 210                 free(prefixed_uuid);
 211
 212         addout:
 213         dm_task_destroy (dmt);
 214         return r;
 215 }
 216
 217 extern int
 218 dm_map_present (char * str)
 219 {
 220         int r = 0;
 221         struct dm_task *dmt;
 222         struct dm_info info;
 223
 224         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 225                 return 0;
 226
 227         if (!dm_task_set_name(dmt, str))
 228                 goto out;
 229
 230         dm_task_no_open_count(dmt);
 231
 232         if (!dm_task_run(dmt))
 233                 goto out;
 234
 235         if (!dm_task_get_info(dmt, &info))
 236                 goto out;
 237
 238         if (info.exists)
 239                 r = 1;
 240 out:
 241         dm_task_destroy(dmt);
 242         return r;
 243 }
 244
 245 extern int
 246 dm_get_map(char * name, unsigned long long * size, char * outparams)
 247 {
 248         int r = 1;
 249         struct dm_task *dmt;
 250         void *next = NULL;
 251         uint64_t start, length;
 252         char *target_type = NULL;
 253         char *params = NULL;
 254
 255         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 256                 return 1;
 257
 258         if (!dm_task_set_name(dmt, name))
 259                 goto out;
 260
 261         dm_task_no_open_count(dmt);
 262
 263         if (!dm_task_run(dmt))
 264                 goto out;
 265
 266         /* Fetch 1st target */
 267         next = dm_get_next_target(dmt, next, &start, &length,
 268                                   &target_type, &params);
 269
 270         if (size)
 271                 *size = length;
 272
 273         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 274                 r = 0;
 275 out:
 276         dm_task_destroy(dmt);
 277         return r;
 278 }
 279
 280 extern int
 281 dm_get_uuid(char *name, char *uuid)
 282 {
 283         struct dm_task *dmt;
 284         const char *uuidtmp;
 285         int r = 1;
 286
 287         dmt = dm_task_create(DM_DEVICE_INFO);
 288         if (!dmt)
 289                 return 1;
 290
 291         if (!dm_task_set_name (dmt, name))
 292                 goto uuidout;
 293
 294         if (!dm_task_run(dmt))
 295                 goto uuidout;
 296
 297         uuidtmp = dm_task_get_uuid(dmt);
 298         if (uuidtmp) {
 299                 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 300                         strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 301                 else
 302                         strcpy(uuid, uuidtmp);
 303         }
 304         else
 305                 uuid[0] = '\0';
 306
 307         r = 0;
 308 uuidout:
 309         dm_task_destroy(dmt);
 310         return r;
 311 }
 312
 313 extern int
 314 dm_get_status(char * name, char * outstatus)
 315 {
 316         int r = 1;
 317         struct dm_task *dmt;
 318         void *next = NULL;
 319         uint64_t start, length;
 320         char *target_type;
 321         char *status;
 322
 323         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 324                 return 1;
 325
 326         if (!dm_task_set_name(dmt, name))
 327                 goto out;
 328
 329         dm_task_no_open_count(dmt);
 330
 331         if (!dm_task_run(dmt))
 332                 goto out;
 333
 334         /* Fetch 1st target */
 335         next = dm_get_next_target(dmt, next, &start, &length,
 336                                   &target_type, &status);
 337
 338         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 339                 r = 0;
 340 out:
 341         if (r)
 342                 condlog(0, "%s: error getting map status string", name);
 343
 344         dm_task_destroy(dmt);
 345         return r;
 346 }
 347
 348 /*
 349  * returns:
 350  *    1 : match
 351  *    0 : no match
 352  *   -1 : empty map
 353  */
 354 extern int
 355 dm_type(char * name, char * type)
 356 {
 357         int r = 0;
 358         struct dm_task *dmt;
 359         void *next = NULL;
 360         uint64_t start, length;
 361         char *target_type = NULL;
 362         char *params;
 363
 364         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 365                 return 0;
 366
 367         if (!dm_task_set_name(dmt, name))
 368                 goto out;
 369
 370         dm_task_no_open_count(dmt);
 371
 372         if (!dm_task_run(dmt))
 373                 goto out;
 374
 375         /* Fetch 1st target */
 376         next = dm_get_next_target(dmt, next, &start, &length,
 377                                   &target_type, &params);
 378
 379         if (!target_type)
 380                 r = -1;
 381         else if (!strcmp(target_type, type))
 382                 r = 1;
 383
 384 out:
 385         dm_task_destroy(dmt);
 386         return r;
 387 }
 388
 389 static int
 390 dm_dev_t (char * mapname, char * dev_t, int len)
 391 {
 392         int r = 1;
 393         struct dm_task *dmt;
 394         struct dm_info info;
 395
 396         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 397                 return 0;
 398
 399         if (!dm_task_set_name(dmt, mapname))
 400                 goto out;
 401
 402         if (!dm_task_run(dmt))
 403                 goto out;
 404
 405         if (!dm_task_get_info(dmt, &info))
 406                 goto out;
 407
 408         r = info.open_count;
 409         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 410                     goto out;
 411
 412         r = 0;
 413 out:
 414         dm_task_destroy(dmt);
 415         return r;
 416 }
 417
 418 int
 419 dm_get_opencount (char * mapname)
 420 {
 421         int r = -1;
 422         struct dm_task *dmt;
 423         struct dm_info info;
 424
 425         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 426                 return 0;
 427
 428         if (!dm_task_set_name(dmt, mapname))
 429                 goto out;
 430
 431         if (!dm_task_run(dmt))
 432                 goto out;
 433
 434         if (!dm_task_get_info(dmt, &info))
 435                 goto out;
 436
 437         r = info.open_count;
 438 out:
 439         dm_task_destroy(dmt);
 440         return r;
 441 }
 442
 443 int
 444 dm_get_minor (char * mapname)
 445 {
 446         int r = -1;
 447         struct dm_task *dmt;
 448         struct dm_info info;
 449
 450         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 451                 return 0;
 452
 453         if (!dm_task_set_name(dmt, mapname))
 454                 goto out;
 455
 456         if (!dm_task_run(dmt))
 457                 goto out;
 458
 459         if (!dm_task_get_info(dmt, &info))
 460                 goto out;
 461
 462         r = info.minor;
 463 out:
 464         dm_task_destroy(dmt);
 465         return r;
 466 }
 467
 468 extern int
 469 dm_flush_map (char * mapname, char * type)
 470 {
 471         int r;
 472
 473         if (!dm_map_present(mapname))
 474                 return 0;
 475
 476         if (dm_type(mapname, type) <= 0)
 477                 return 1;
 478
 479         if (dm_remove_partmaps(mapname))
 480                 return 1;
 481
 482         if (dm_get_opencount(mapname)) {
 483                 condlog(2, "%s: map in use", mapname);
 484                 return 1;
 485         }
 486
 487         r = dm_simplecmd(DM_DEVICE_REMOVE, mapname);
 488
 489         if (r) {
 490                 condlog(4, "multipath map %s removed", mapname);
 491                 return 0;
 492         }
 493         return 1;
 494 }
 495
 496 extern int
 497 dm_flush_maps (char * type)
 498 {
 499         int r = 0;
 500         struct dm_task *dmt;
 501         struct dm_names *names;
 502         unsigned next = 0;
 503
 504         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 505                 return 0;
 506
 507         dm_task_no_open_count(dmt);
 508
 509         if (!dm_task_run (dmt))
 510                 goto out;
 511
 512         if (!(names = dm_task_get_names (dmt)))
 513                 goto out;
 514
 515         if (!names->dev)
 516                 goto out;
 517
 518         do {
 519                 r += dm_flush_map(names->name, type);
 520                 next = names->next;
 521                 names = (void *) names + next;
 522         } while (next);
 523
 524         out:
 525         dm_task_destroy (dmt);
 526         return r;
 527 }
 528
 529 int
 530 dm_message(char * mapname, char * message)
 531 {
 532         int r = 1;
 533         struct dm_task *dmt;
 534
 535         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 536                 return 1;
 537
 538         if (!dm_task_set_name(dmt, mapname))
 539                 goto out;
 540
 541         if (!dm_task_set_sector(dmt, 0))
 542                 goto out;
 543
 544         if (!dm_task_set_message(dmt, message))
 545                 goto out;
 546
 547         dm_task_no_open_count(dmt);
 548
 549         if (!dm_task_run(dmt))
 550                 goto out;
 551
 552         r = 0;
 553 out:
 554         if (r)
 555                 condlog(0, "DM message failed [%s]", message);
 556
 557         dm_task_destroy(dmt);
 558         return r;
 559 }
 560
 561 int
 562 dm_fail_path(char * mapname, char * path)
 563 {
 564         char message[32];
 565
 566         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 567                 return 1;
 568
 569         return dm_message(mapname, message);
 570 }
 571
 572 int
 573 dm_reinstate_path(char * mapname, char * path)
 574 {
 575         char message[32];
 576
 577         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 578                 return 1;
 579
 580         return dm_message(mapname, message);
 581 }
 582
 583 int
 584 dm_queue_if_no_path(char *mapname, int enable)
 585 {
 586         char *message;
 587
 588         if (enable)
 589                 message = "queue_if_no_path\n";
 590         else
 591                 message = "fail_if_no_path\n";
 592
 593         return dm_message(mapname, message);
 594 }
 595
 596 int
 597 dm_set_pg_timeout(char *mapname, int timeout_val)
 598 {
 599         char message[24];
 600
 601         if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
 602                 return 1;
 603         return dm_message(mapname, message);
 604 }
 605
 606 static int
 607 dm_groupmsg (char * msg, char * mapname, int index)
 608 {
 609         char message[32];
 610
 611         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 612                 return 1;
 613
 614         return dm_message(mapname, message);
 615 }
 616
 617 int
 618 dm_switchgroup(char * mapname, int index)
 619 {
 620         return dm_groupmsg("switch", mapname, index);
 621 }
 622
 623 int
 624 dm_enablegroup(char * mapname, int index)
 625 {
 626         return dm_groupmsg("enable", mapname, index);
 627 }
 628
 629 int
 630 dm_disablegroup(char * mapname, int index)
 631 {
 632         return dm_groupmsg("disable", mapname, index);
 633 }
 634
 635 int
 636 dm_get_maps (vector mp, char * type)
 637 {
 638         struct multipath * mpp;
 639         int r = 1;
 640         int info;
 641         struct dm_task *dmt;
 642         struct dm_names *names;
 643         unsigned next = 0;
 644
 645         if (!type || !mp)
 646                 return 1;
 647
 648         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 649                 return 1;
 650
 651         dm_task_no_open_count(dmt);
 652
 653         if (!dm_task_run(dmt))
 654                 goto out;
 655
 656         if (!(names = dm_task_get_names(dmt)))
 657                 goto out;
 658
 659         if (!names->dev) {
 660                 r = 0; /* this is perfectly valid */
 661                 goto out;
 662         }
 663
 664         do {
 665                 info = dm_type(names->name, type);
 666
 667                 if (info <= 0)
 668                         goto next;
 669
 670                 mpp = alloc_multipath();
 671
 672                 if (!mpp)
 673                         goto out;
 674
 675                 mpp->alias = STRDUP(names->name);
 676
 677                 if (!mpp->alias)
 678                         goto out1;
 679
 680                 if (info > 0) {
 681                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 682                                 goto out1;
 683
 684                         if (dm_get_status(names->name, mpp->status))
 685                                 goto out1;
 686
 687                         dm_get_uuid(names->name, mpp->wwid);
 688                         dm_get_info(names->name, &mpp->dmi);
 689                 }
 690
 691                 if (!vector_alloc_slot(mp))
 692                         goto out1;
 693
 694                 vector_set_slot(mp, mpp);
 695                 mpp = NULL;
 696 next:
 697                 next = names->next;
 698                 names = (void *) names + next;
 699         } while (next);
 700
 701         r = 0;
 702         goto out;
 703 out1:
 704         free_multipath(mpp, KEEP_PATHS);
 705 out:
 706         dm_task_destroy (dmt);
 707         return r;
 708 }
 709
 710 extern int
 711 dm_get_name(char *uuid, char *type, char *name)
 712 {
 713         vector vec;
 714         struct multipath *mpp;
 715         int i;
 716
 717         vec = vector_alloc();
 718
 719         if (!vec)
 720                 return 0;
 721
 722         if (dm_get_maps(vec, type)) {
 723                 vector_free(vec);
 724                 return 0;
 725         }
 726
 727         vector_foreach_slot(vec, mpp, i) {
 728                 if (!strcmp(uuid, mpp->wwid)) {
 729                         vector_free(vec);
 730                         strcpy(name, mpp->alias);
 731                         return 1;
 732                 }
 733         }
 734
 735         vector_free(vec);
 736         return 0;
 737 }
 738
 739 int
 740 dm_geteventnr (char *name)
 741 {
 742         struct dm_task *dmt;
 743         struct dm_info info;
 744
 745         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 746                 return 0;
 747
 748         if (!dm_task_set_name(dmt, name))
 749                 goto out;
 750
 751         dm_task_no_open_count(dmt);
 752
 753         if (!dm_task_run(dmt))
 754                 goto out;
 755
 756         if (!dm_task_get_info(dmt, &info)) {
 757                 info.event_nr = 0;
 758                 goto out;
 759         }
 760
 761         if (!info.exists) {
 762                 info.event_nr = 0;
 763                 goto out;
 764         }
 765
 766 out:
 767         dm_task_destroy(dmt);
 768
 769         return info.event_nr;
 770 }
 771
 772 char *
 773 dm_mapname(int major, int minor)
 774 {
 775         char * response = NULL;
 776         const char *map;
 777         struct dm_task *dmt;
 778         int r;
 779         int loop = MAX_WAIT * LOOPS_PER_SEC;
 780
 781         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 782                 return NULL;
 783
 784         if (!dm_task_set_major(dmt, major) ||
 785             !dm_task_set_minor(dmt, minor))
 786                 goto bad;
 787
 788         dm_task_no_open_count(dmt);
 789
 790         /*
 791          * device map might not be ready when we get here from
 792          * daemon uev_trigger -> uev_add_map
 793          */
 794         while (--loop) {
 795                 r = dm_task_run(dmt);
 796
 797                 if (r)
 798                         break;
 799
 800                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 801         }
 802
 803         if (!r) {
 804                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 805                 goto bad;
 806         }
 807
 808         map = dm_task_get_name(dmt);
 809         if (map && strlen(map))
 810                 response = STRDUP((char *)dm_task_get_name(dmt));
 811
 812         dm_task_destroy(dmt);
 813         return response;
 814 bad:
 815         dm_task_destroy(dmt);
 816         condlog(0, "%i:%i: error fetching map name", major, minor);
 817         return NULL;
 818 }
 819
 820 int
 821 dm_remove_partmaps (char * mapname)
 822 {
 823         struct dm_task *dmt;
 824         struct dm_names *names;
 825         unsigned next = 0;
 826         char params[PARAMS_SIZE];
 827         unsigned long long size;
 828         char dev_t[32];
 829         int r = 1;
 830
 831         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 832                 return 1;
 833
 834         dm_task_no_open_count(dmt);
 835
 836         if (!dm_task_run(dmt))
 837                 goto out;
 838
 839         if (!(names = dm_task_get_names(dmt)))
 840                 goto out;
 841
 842         if (!names->dev) {
 843                 r = 0; /* this is perfectly valid */
 844                 goto out;
 845         }
 846
 847         if (dm_dev_t(mapname, &dev_t[0], 32))
 848                 goto out;
 849
 850         do {
 851                 if (
 852                     /*
 853                      * if devmap target is "linear"
 854                      */
 855                     (dm_type(names->name, "linear") > 0) &&
 856
 857                     /*
 858                      * and the multipath mapname and the part mapname start
 859                      * the same
 860                      */
 861                     !strncmp(names->name, mapname, strlen(mapname)) &&
 862
 863                     /*
 864                      * and the opencount is 0 for us to allow removal
 865                      */
 866                     !dm_get_opencount(names->name) &&
 867
 868                     /*
 869                      * and we can fetch the map table from the kernel
 870                      */
 871                     !dm_get_map(names->name, &size, &params[0]) &&
 872
 873                     /*
 874                      * and the table maps over the multipath map
 875                      */
 876                     strstr(params, dev_t)
 877                    ) {
 878                                 /*
 879                                  * then it's a kpartx generated partition.
 880                                  * remove it.
 881                                  */
 882                                 condlog(4, "partition map %s removed",
 883                                         names->name);
 884                                 dm_simplecmd(DM_DEVICE_REMOVE, names->name);
 885                    }
 886
 887                 next = names->next;
 888                 names = (void *) names + next;
 889         } while (next);
 890
 891         r = 0;
 892 out:
 893         dm_task_destroy (dmt);
 894         return r;
 895 }
 896
 897 static struct dm_info *
 898 alloc_dminfo (void)
 899 {
 900         return MALLOC(sizeof(struct dm_info));
 901 }
 902
 903 int
 904 dm_get_info (char * mapname, struct dm_info ** dmi)
 905 {
 906         int r = 1;
 907         struct dm_task *dmt = NULL;
 908
 909         if (!mapname)
 910                 return 1;
 911
 912         if (!*dmi)
 913                 *dmi = alloc_dminfo();
 914
 915         if (!*dmi)
 916                 return 1;
 917
 918         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 919                 goto out;
 920
 921         if (!dm_task_set_name(dmt, mapname))
 922                 goto out;
 923
 924         dm_task_no_open_count(dmt);
 925
 926         if (!dm_task_run(dmt))
 927                 goto out;
 928
 929         if (!dm_task_get_info(dmt, *dmi))
 930                 goto out;
 931
 932         r = 0;
 933 out:
 934         if (r)
 935                 memset(*dmi, 0, sizeof(struct dm_info));
 936
 937         if (dmt)
 938                 dm_task_destroy(dmt);
 939
 940         return r;
 941 }
 942
 943 int
 944 dm_rename_partmaps (char * old, char * new)
 945 {
 946         struct dm_task *dmt;
 947         struct dm_names *names;
 948         unsigned next = 0;
 949         char buff[PARAMS_SIZE];
 950         unsigned long long size;
 951         char dev_t[32];
 952         int r = 1;
 953
 954         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 955                 return 1;
 956
 957         dm_task_no_open_count(dmt);
 958
 959         if (!dm_task_run(dmt))
 960                 goto out;
 961
 962         if (!(names = dm_task_get_names(dmt)))
 963                 goto out;
 964
 965         if (!names->dev) {
 966                 r = 0; /* this is perfectly valid */
 967                 goto out;
 968         }
 969
 970         if (dm_dev_t(old, &dev_t[0], 32))
 971                 goto out;
 972
 973         do {
 974                 if (
 975                     /*
 976                      * if devmap target is "linear"
 977                      */
 978                     (dm_type(names->name, "linear") > 0) &&
 979
 980                     /*
 981                      * and the multipath mapname and the part mapname start
 982                      * the same
 983                      */
 984                     !strncmp(names->name, old, strlen(old)) &&
 985
 986                     /*
 987                      * and we can fetch the map table from the kernel
 988                      */
 989                     !dm_get_map(names->name, &size, &buff[0]) &&
 990
 991                     /*
 992                      * and the table maps over the multipath map
 993                      */
 994                     strstr(buff, dev_t)
 995                    ) {
 996                                 /*
 997                                  * then it's a kpartx generated partition.
 998                                  * Rename it.
 999                                  */
1000                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1001                                          new, names->name + strlen(old));
1002                                 dm_rename(names->name, buff);
1003                                 condlog(4, "partition map %s renamed",
1004                                         names->name);
1005                    }
1006
1007                 next = names->next;
1008                 names = (void *) names + next;
1009         } while (next);
1010
1011         r = 0;
1012 out:
1013         dm_task_destroy (dmt);
1014         return r;
1015 }
1016
1017 int
1018 dm_rename (char * old, char * new)
1019 {
1020         int r = 0;
1021         struct dm_task *dmt;
1022
1023         if (dm_rename_partmaps(old, new))
1024                 return r;
1025
1026         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1027                 return r;
1028
1029         if (!dm_task_set_name(dmt, old))
1030                 goto out;
1031
1032         if (!dm_task_set_newname(dmt, new))
1033                 goto out;
1034
1035         dm_task_no_open_count(dmt);
1036
1037         if (!dm_task_run(dmt))
1038                 goto out;
1039
1040         r = 1;
1041 out:
1042         dm_task_destroy(dmt);
1043         return r;
1044 }