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 (void)
 146 {
 147         if (dm_libprereq())
 148                 return 1;
 149         return dm_drvprereq(TGT_MPATH);
 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 ro) {
 180         int r = 0;
 181         struct dm_task *dmt;
 182         char *prefixed_uuid = NULL;
 183
 184         if (!(dmt = dm_task_create (task)))
 185                 return 0;
 186
 187         if (!dm_task_set_name (dmt, name))
 188                 goto addout;
 189
 190         if (!dm_task_add_target (dmt, 0, size, target, params))
 191                 goto addout;
 192
 193         if (ro)
 194                 dm_task_set_ro(dmt);
 195
 196         if (uuid){
 197                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
 198                 if (!prefixed_uuid) {
 199                         condlog(0, "cannot create prefixed uuid : %s\n",
 200                                 strerror(errno));
 201                         goto addout;
 202                 }
 203                 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
 204                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 205                         goto freeout;
 206         }
 207
 208         dm_task_no_open_count(dmt);
 209
 210         r = dm_task_run (dmt);
 211
 212         freeout:
 213         if (prefixed_uuid)
 214                 FREE(prefixed_uuid);
 215
 216         addout:
 217         dm_task_destroy (dmt);
 218
 219         return r;
 220 }
 221
 222 static int
 223 _dm_addmap_create (const char *name, const char *params,
 224                   unsigned long long size, const char *uuid, int ro) {
 225         int r;
 226         r = dm_addmap(DM_DEVICE_CREATE, name, TGT_MPATH, params, size, uuid,
 227                       ro);
 228         /*
 229          * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
 230          * Failing the second part leaves an empty map. Clean it up.
 231          */
 232         if (!r && dm_map_present(name)) {
 233                 condlog(3, "%s: failed to load map (a path might be in use)",
 234                         name);
 235                 dm_flush_map(name);
 236         }
 237         return r;
 238 }
 239
 240 #define ADDMAP_RW 0
 241 #define ADDMAP_RO 1
 242
 243 extern int
 244 dm_addmap_create (const char *name, const char *params,
 245                   unsigned long long size, const char *uuid) {
 246         return _dm_addmap_create(name, params, size, uuid, ADDMAP_RW);
 247 }
 248
 249 extern int
 250 dm_addmap_create_ro (const char *name, const char *params,
 251                   unsigned long long size, const char *uuid) {
 252         return _dm_addmap_create(name, params, size, uuid, ADDMAP_RO);
 253 }
 254
 255 extern int
 256 dm_addmap_reload (const char *name, const char *params,
 257                   unsigned long long size, const char *uuid) {
 258         return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
 259                          ADDMAP_RW);
 260 }
 261
 262 extern int
 263 dm_addmap_reload_ro (const char *name, const char *params,
 264                      unsigned long long size, const char *uuid) {
 265         return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
 266                          ADDMAP_RO);
 267 }
 268
 269 extern int
 270 dm_map_present (const char * str)
 271 {
 272         int r = 0;
 273         struct dm_task *dmt;
 274         struct dm_info info;
 275
 276         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 277                 return 0;
 278
 279         if (!dm_task_set_name(dmt, str))
 280                 goto out;
 281
 282         dm_task_no_open_count(dmt);
 283
 284         if (!dm_task_run(dmt))
 285                 goto out;
 286
 287         if (!dm_task_get_info(dmt, &info))
 288                 goto out;
 289
 290         if (info.exists)
 291                 r = 1;
 292 out:
 293         dm_task_destroy(dmt);
 294         return r;
 295 }
 296
 297 extern int
 298 dm_get_map(char * name, unsigned long long * size, char * outparams)
 299 {
 300         int r = 1;
 301         struct dm_task *dmt;
 302         void *next = NULL;
 303         uint64_t start, length;
 304         char *target_type = NULL;
 305         char *params = NULL;
 306
 307         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 308                 return 1;
 309
 310         if (!dm_task_set_name(dmt, name))
 311                 goto out;
 312
 313         dm_task_no_open_count(dmt);
 314
 315         if (!dm_task_run(dmt))
 316                 goto out;
 317
 318         /* Fetch 1st target */
 319         next = dm_get_next_target(dmt, next, &start, &length,
 320                                   &target_type, &params);
 321
 322         if (size)
 323                 *size = length;
 324
 325         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 326                 r = 0;
 327 out:
 328         dm_task_destroy(dmt);
 329         return r;
 330 }
 331
 332 extern int
 333 dm_get_uuid(char *name, char *uuid)
 334 {
 335         struct dm_task *dmt;
 336         const char *uuidtmp;
 337         int r = 1;
 338
 339         dmt = dm_task_create(DM_DEVICE_INFO);
 340         if (!dmt)
 341                 return 1;
 342
 343         if (!dm_task_set_name (dmt, name))
 344                 goto uuidout;
 345
 346         if (!dm_task_run(dmt))
 347                 goto uuidout;
 348
 349         uuidtmp = dm_task_get_uuid(dmt);
 350         if (uuidtmp) {
 351                 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 352                         strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 353                 else
 354                         strcpy(uuid, uuidtmp);
 355         }
 356         else
 357                 uuid[0] = '\0';
 358
 359         r = 0;
 360 uuidout:
 361         dm_task_destroy(dmt);
 362         return r;
 363 }
 364
 365 extern int
 366 dm_get_status(char * name, char * outstatus)
 367 {
 368         int r = 1;
 369         struct dm_task *dmt;
 370         void *next = NULL;
 371         uint64_t start, length;
 372         char *target_type;
 373         char *status;
 374
 375         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 376                 return 1;
 377
 378         if (!dm_task_set_name(dmt, name))
 379                 goto out;
 380
 381         dm_task_no_open_count(dmt);
 382
 383         if (!dm_task_run(dmt))
 384                 goto out;
 385
 386         /* Fetch 1st target */
 387         next = dm_get_next_target(dmt, next, &start, &length,
 388                                   &target_type, &status);
 389
 390         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 391                 r = 0;
 392 out:
 393         if (r)
 394                 condlog(0, "%s: error getting map status string", name);
 395
 396         dm_task_destroy(dmt);
 397         return r;
 398 }
 399
 400 /*
 401  * returns:
 402  *    1 : match
 403  *    0 : no match
 404  *   -1 : empty map
 405  */
 406 extern int
 407 dm_type(const char * name, char * type)
 408 {
 409         int r = 0;
 410         struct dm_task *dmt;
 411         void *next = NULL;
 412         uint64_t start, length;
 413         char *target_type = NULL;
 414         char *params;
 415
 416         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 417                 return 0;
 418
 419         if (!dm_task_set_name(dmt, name))
 420                 goto out;
 421
 422         dm_task_no_open_count(dmt);
 423
 424         if (!dm_task_run(dmt))
 425                 goto out;
 426
 427         /* Fetch 1st target */
 428         next = dm_get_next_target(dmt, next, &start, &length,
 429                                   &target_type, &params);
 430
 431         if (!target_type)
 432                 r = -1;
 433         else if (!strcmp(target_type, type))
 434                 r = 1;
 435
 436 out:
 437         dm_task_destroy(dmt);
 438         return r;
 439 }
 440
 441 static int
 442 dm_dev_t (const char * mapname, char * dev_t, int len)
 443 {
 444         int r = 1;
 445         struct dm_task *dmt;
 446         struct dm_info info;
 447
 448         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 449                 return 0;
 450
 451         if (!dm_task_set_name(dmt, mapname))
 452                 goto out;
 453
 454         if (!dm_task_run(dmt))
 455                 goto out;
 456
 457         if (!dm_task_get_info(dmt, &info))
 458                 goto out;
 459
 460         r = info.open_count;
 461         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 462                     goto out;
 463
 464         r = 0;
 465 out:
 466         dm_task_destroy(dmt);
 467         return r;
 468 }
 469
 470 int
 471 dm_get_opencount (const char * mapname)
 472 {
 473         int r = -1;
 474         struct dm_task *dmt;
 475         struct dm_info info;
 476
 477         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 478                 return 0;
 479
 480         if (!dm_task_set_name(dmt, mapname))
 481                 goto out;
 482
 483         if (!dm_task_run(dmt))
 484                 goto out;
 485
 486         if (!dm_task_get_info(dmt, &info))
 487                 goto out;
 488
 489         r = info.open_count;
 490 out:
 491         dm_task_destroy(dmt);
 492         return r;
 493 }
 494
 495 int
 496 dm_get_minor (char * mapname)
 497 {
 498         int r = -1;
 499         struct dm_task *dmt;
 500         struct dm_info info;
 501
 502         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 503                 return 0;
 504
 505         if (!dm_task_set_name(dmt, mapname))
 506                 goto out;
 507
 508         if (!dm_task_run(dmt))
 509                 goto out;
 510
 511         if (!dm_task_get_info(dmt, &info))
 512                 goto out;
 513
 514         r = info.minor;
 515 out:
 516         dm_task_destroy(dmt);
 517         return r;
 518 }
 519
 520 extern int
 521 dm_flush_map (const char * mapname)
 522 {
 523         int r;
 524
 525         if (!dm_map_present(mapname))
 526                 return 0;
 527
 528         if (dm_type(mapname, TGT_MPATH) <= 0)
 529                 return 0; /* nothing to do */
 530
 531         if (dm_remove_partmaps(mapname))
 532                 return 1;
 533
 534         if (dm_get_opencount(mapname)) {
 535                 condlog(2, "%s: map in use", mapname);
 536                 return 1;
 537         }
 538
 539         r = dm_simplecmd(DM_DEVICE_REMOVE, mapname);
 540
 541         if (r) {
 542                 condlog(4, "multipath map %s removed", mapname);
 543                 return 0;
 544         }
 545         return 1;
 546 }
 547
 548 extern int
 549 dm_flush_maps (void)
 550 {
 551         int r = 0;
 552         struct dm_task *dmt;
 553         struct dm_names *names;
 554         unsigned next = 0;
 555
 556         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 557                 return 0;
 558
 559         dm_task_no_open_count(dmt);
 560
 561         if (!dm_task_run (dmt))
 562                 goto out;
 563
 564         if (!(names = dm_task_get_names (dmt)))
 565                 goto out;
 566
 567         if (!names->dev)
 568                 goto out;
 569
 570         do {
 571                 r |= dm_flush_map(names->name);
 572                 next = names->next;
 573                 names = (void *) names + next;
 574         } while (next);
 575
 576         out:
 577         dm_task_destroy (dmt);
 578         return r;
 579 }
 580
 581 int
 582 dm_message(char * mapname, char * message)
 583 {
 584         int r = 1;
 585         struct dm_task *dmt;
 586
 587         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 588                 return 1;
 589
 590         if (!dm_task_set_name(dmt, mapname))
 591                 goto out;
 592
 593         if (!dm_task_set_sector(dmt, 0))
 594                 goto out;
 595
 596         if (!dm_task_set_message(dmt, message))
 597                 goto out;
 598
 599         dm_task_no_open_count(dmt);
 600
 601         if (!dm_task_run(dmt))
 602                 goto out;
 603
 604         r = 0;
 605 out:
 606         if (r)
 607                 condlog(0, "DM message failed [%s]", message);
 608
 609         dm_task_destroy(dmt);
 610         return r;
 611 }
 612
 613 int
 614 dm_fail_path(char * mapname, char * path)
 615 {
 616         char message[32];
 617
 618         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 619                 return 1;
 620
 621         return dm_message(mapname, message);
 622 }
 623
 624 int
 625 dm_reinstate_path(char * mapname, char * path)
 626 {
 627         char message[32];
 628
 629         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 630                 return 1;
 631
 632         return dm_message(mapname, message);
 633 }
 634
 635 int
 636 dm_queue_if_no_path(char *mapname, int enable)
 637 {
 638         char *message;
 639
 640         if (enable)
 641                 message = "queue_if_no_path\n";
 642         else
 643                 message = "fail_if_no_path\n";
 644
 645         return dm_message(mapname, message);
 646 }
 647
 648 int
 649 dm_set_pg_timeout(char *mapname, int timeout_val)
 650 {
 651         char message[24];
 652
 653         if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
 654                 return 1;
 655         return dm_message(mapname, message);
 656 }
 657
 658 static int
 659 dm_groupmsg (char * msg, char * mapname, int index)
 660 {
 661         char message[32];
 662
 663         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 664                 return 1;
 665
 666         return dm_message(mapname, message);
 667 }
 668
 669 int
 670 dm_switchgroup(char * mapname, int index)
 671 {
 672         return dm_groupmsg("switch", mapname, index);
 673 }
 674
 675 int
 676 dm_enablegroup(char * mapname, int index)
 677 {
 678         return dm_groupmsg("enable", mapname, index);
 679 }
 680
 681 int
 682 dm_disablegroup(char * mapname, int index)
 683 {
 684         return dm_groupmsg("disable", mapname, index);
 685 }
 686
 687 int
 688 dm_get_maps (vector mp)
 689 {
 690         struct multipath * mpp;
 691         int r = 1;
 692         int info;
 693         struct dm_task *dmt;
 694         struct dm_names *names;
 695         unsigned next = 0;
 696
 697         if (!mp)
 698                 return 1;
 699
 700         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 701                 return 1;
 702
 703         dm_task_no_open_count(dmt);
 704
 705         if (!dm_task_run(dmt))
 706                 goto out;
 707
 708         if (!(names = dm_task_get_names(dmt)))
 709                 goto out;
 710
 711         if (!names->dev) {
 712                 r = 0; /* this is perfectly valid */
 713                 goto out;
 714         }
 715
 716         do {
 717                 info = dm_type(names->name, TGT_MPATH);
 718
 719                 if (info <= 0)
 720                         goto next;
 721
 722                 mpp = alloc_multipath();
 723
 724                 if (!mpp)
 725                         goto out;
 726
 727                 mpp->alias = STRDUP(names->name);
 728
 729                 if (!mpp->alias)
 730                         goto out1;
 731
 732                 if (info > 0) {
 733                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 734                                 goto out1;
 735
 736                         if (dm_get_status(names->name, mpp->status))
 737                                 goto out1;
 738
 739                         dm_get_uuid(names->name, mpp->wwid);
 740                         dm_get_info(names->name, &mpp->dmi);
 741                 }
 742
 743                 if (!vector_alloc_slot(mp))
 744                         goto out1;
 745
 746                 vector_set_slot(mp, mpp);
 747                 mpp = NULL;
 748 next:
 749                 next = names->next;
 750                 names = (void *) names + next;
 751         } while (next);
 752
 753         r = 0;
 754         goto out;
 755 out1:
 756         free_multipath(mpp, KEEP_PATHS);
 757 out:
 758         dm_task_destroy (dmt);
 759         return r;
 760 }
 761
 762 extern int
 763 dm_get_name(char *uuid, char *name)
 764 {
 765         vector vec;
 766         struct multipath *mpp;
 767         int i, rc = 0;
 768
 769         vec = vector_alloc();
 770
 771         if (!vec)
 772                 return 0;
 773
 774         if (dm_get_maps(vec)) {
 775                 goto out;
 776         }
 777
 778         vector_foreach_slot(vec, mpp, i) {
 779                 if (!strcmp(uuid, mpp->wwid)) {
 780                         strcpy(name, mpp->alias);
 781                         rc=1;
 782                         break;
 783                 }
 784         }
 785 out:
 786         vector_foreach_slot(vec, mpp, i) {
 787                 free_multipath(mpp, KEEP_PATHS);
 788         }
 789         vector_free(vec);
 790         return rc;
 791 }
 792
 793 int
 794 dm_geteventnr (char *name)
 795 {
 796         struct dm_task *dmt;
 797         struct dm_info info;
 798
 799         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 800                 return 0;
 801
 802         if (!dm_task_set_name(dmt, name))
 803                 goto out;
 804
 805         dm_task_no_open_count(dmt);
 806
 807         if (!dm_task_run(dmt))
 808                 goto out;
 809
 810         if (!dm_task_get_info(dmt, &info)) {
 811                 info.event_nr = 0;
 812                 goto out;
 813         }
 814
 815         if (!info.exists) {
 816                 info.event_nr = 0;
 817                 goto out;
 818         }
 819
 820 out:
 821         dm_task_destroy(dmt);
 822
 823         return info.event_nr;
 824 }
 825
 826 char *
 827 dm_mapname(int major, int minor)
 828 {
 829         char * response = NULL;
 830         const char *map;
 831         struct dm_task *dmt;
 832         int r;
 833         int loop = MAX_WAIT * LOOPS_PER_SEC;
 834
 835         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 836                 return NULL;
 837
 838         if (!dm_task_set_major(dmt, major) ||
 839             !dm_task_set_minor(dmt, minor))
 840                 goto bad;
 841
 842         dm_task_no_open_count(dmt);
 843
 844         /*
 845          * device map might not be ready when we get here from
 846          * daemon uev_trigger -> uev_add_map
 847          */
 848         while (--loop) {
 849                 r = dm_task_run(dmt);
 850
 851                 if (r)
 852                         break;
 853
 854                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 855         }
 856
 857         if (!r) {
 858                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 859                 goto bad;
 860         }
 861
 862         map = dm_task_get_name(dmt);
 863         if (map && strlen(map))
 864                 response = STRDUP((char *)dm_task_get_name(dmt));
 865
 866         dm_task_destroy(dmt);
 867         return response;
 868 bad:
 869         dm_task_destroy(dmt);
 870         condlog(0, "%i:%i: error fetching map name", major, minor);
 871         return NULL;
 872 }
 873
 874 int
 875 dm_remove_partmaps (const char * mapname)
 876 {
 877         struct dm_task *dmt;
 878         struct dm_names *names;
 879         unsigned next = 0;
 880         char params[PARAMS_SIZE];
 881         unsigned long long size;
 882         char dev_t[32];
 883         int r = 1;
 884
 885         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 886                 return 1;
 887
 888         dm_task_no_open_count(dmt);
 889
 890         if (!dm_task_run(dmt))
 891                 goto out;
 892
 893         if (!(names = dm_task_get_names(dmt)))
 894                 goto out;
 895
 896         if (!names->dev) {
 897                 r = 0; /* this is perfectly valid */
 898                 goto out;
 899         }
 900
 901         if (dm_dev_t(mapname, &dev_t[0], 32))
 902                 goto out;
 903
 904         do {
 905                 if (
 906                     /*
 907                      * if devmap target is "linear"
 908                      */
 909                     (dm_type(names->name, TGT_PART) > 0) &&
 910
 911                     /*
 912                      * and the multipath mapname and the part mapname start
 913                      * the same
 914                      */
 915                     !strncmp(names->name, mapname, strlen(mapname)) &&
 916
 917                     /*
 918                      * and the opencount is 0 for us to allow removal
 919                      */
 920                     !dm_get_opencount(names->name) &&
 921
 922                     /*
 923                      * and we can fetch the map table from the kernel
 924                      */
 925                     !dm_get_map(names->name, &size, &params[0]) &&
 926
 927                     /*
 928                      * and the table maps over the multipath map
 929                      */
 930                     strstr(params, dev_t)
 931                    ) {
 932                                 /*
 933                                  * then it's a kpartx generated partition.
 934                                  * remove it.
 935                                  */
 936                                 condlog(4, "partition map %s removed",
 937                                         names->name);
 938                                 dm_simplecmd(DM_DEVICE_REMOVE, names->name);
 939                    }
 940
 941                 next = names->next;
 942                 names = (void *) names + next;
 943         } while (next);
 944
 945         r = 0;
 946 out:
 947         dm_task_destroy (dmt);
 948         return r;
 949 }
 950
 951 static struct dm_info *
 952 alloc_dminfo (void)
 953 {
 954         return MALLOC(sizeof(struct dm_info));
 955 }
 956
 957 int
 958 dm_get_info (char * mapname, struct dm_info ** dmi)
 959 {
 960         int r = 1;
 961         struct dm_task *dmt = NULL;
 962
 963         if (!mapname)
 964                 return 1;
 965
 966         if (!*dmi)
 967                 *dmi = alloc_dminfo();
 968
 969         if (!*dmi)
 970                 return 1;
 971
 972         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 973                 goto out;
 974
 975         if (!dm_task_set_name(dmt, mapname))
 976                 goto out;
 977
 978         dm_task_no_open_count(dmt);
 979
 980         if (!dm_task_run(dmt))
 981                 goto out;
 982
 983         if (!dm_task_get_info(dmt, *dmi))
 984                 goto out;
 985
 986         r = 0;
 987 out:
 988         if (r)
 989                 memset(*dmi, 0, sizeof(struct dm_info));
 990
 991         if (dmt)
 992                 dm_task_destroy(dmt);
 993
 994         return r;
 995 }
 996
 997 int
 998 dm_rename_partmaps (char * old, char * new)
 999 {
1000         struct dm_task *dmt;
1001         struct dm_names *names;
1002         unsigned next = 0;
1003         char buff[PARAMS_SIZE];
1004         unsigned long long size;
1005         char dev_t[32];
1006         int r = 1;
1007
1008         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1009                 return 1;
1010
1011         dm_task_no_open_count(dmt);
1012
1013         if (!dm_task_run(dmt))
1014                 goto out;
1015
1016         if (!(names = dm_task_get_names(dmt)))
1017                 goto out;
1018
1019         if (!names->dev) {
1020                 r = 0; /* this is perfectly valid */
1021                 goto out;
1022         }
1023
1024         if (dm_dev_t(old, &dev_t[0], 32))
1025                 goto out;
1026
1027         do {
1028                 if (
1029                     /*
1030                      * if devmap target is "linear"
1031                      */
1032                     (dm_type(names->name, TGT_PART) > 0) &&
1033
1034                     /*
1035                      * and the multipath mapname and the part mapname start
1036                      * the same
1037                      */
1038                     !strncmp(names->name, old, strlen(old)) &&
1039
1040                     /*
1041                      * and we can fetch the map table from the kernel
1042                      */
1043                     !dm_get_map(names->name, &size, &buff[0]) &&
1044
1045                     /*
1046                      * and the table maps over the multipath map
1047                      */
1048                     strstr(buff, dev_t)
1049                    ) {
1050                                 /*
1051                                  * then it's a kpartx generated partition.
1052                                  * Rename it.
1053                                  */
1054                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1055                                          new, names->name + strlen(old));
1056                                 dm_rename(names->name, buff);
1057                                 condlog(4, "partition map %s renamed",
1058                                         names->name);
1059                    }
1060
1061                 next = names->next;
1062                 names = (void *) names + next;
1063         } while (next);
1064
1065         r = 0;
1066 out:
1067         dm_task_destroy (dmt);
1068         return r;
1069 }
1070
1071 int
1072 dm_rename (char * old, char * new)
1073 {
1074         int r = 0;
1075         struct dm_task *dmt;
1076
1077         if (dm_rename_partmaps(old, new))
1078                 return r;
1079
1080         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1081                 return r;
1082
1083         if (!dm_task_set_name(dmt, old))
1084                 goto out;
1085
1086         if (!dm_task_set_newname(dmt, new))
1087                 goto out;
1088
1089         dm_task_no_open_count(dmt);
1090
1091         if (!dm_task_run(dmt))
1092                 goto out;
1093
1094         r = 1;
1095 out:
1096         dm_task_destroy(dmt);
1097         return r;
1098 }