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 <unistd.h>
  14 #include <errno.h>
  15
  16 #include "checkers.h"
  17 #include "vector.h"
  18 #include "structs.h"
  19 #include "debug.h"
  20 #include "memory.h"
  21 #include "devmapper.h"
  22 #include "config.h"
  23
  24 #include "log_pthread.h"
  25 #include <sys/types.h>
  26 #include <time.h>
  27
  28 #define MAX_WAIT 5
  29 #define LOOPS_PER_SEC 5
  30
  31 #define UUID_PREFIX "mpath-"
  32 #define UUID_PREFIX_LEN 6
  33
  34 static void
  35 dm_write_log (int level, const char *file, int line, const char *f, ...)
  36 {
  37         va_list ap;
  38         int thres;
  39
  40         if (level > 6)
  41                 level = 6;
  42
  43         thres = (conf) ? conf->verbosity : 0;
  44         if (thres <= 3 || level > thres)
  45                 return;
  46
  47         va_start(ap, f);
  48         if (!logsink) {
  49                 time_t t = time(NULL);
  50                 struct tm *tb = localtime(&t);
  51                 char buff[16];
  52
  53                 strftime(buff, sizeof(buff), "%b %d %H:%M:%S", tb);
  54                 buff[sizeof(buff)-1] = '\0';
  55
  56                 fprintf(stdout, "%s | ", buff);
  57                 fprintf(stdout, "libdevmapper: %s(%i): ", file, line);
  58                 vfprintf(stdout, f, ap);
  59                 fprintf(stdout, "\n");
  60         } else {
  61                 condlog(level, "libdevmapper: %s(%i): ", file, line);
  62                 log_safe(level + 3, f, ap);
  63         }
  64         va_end(ap);
  65
  66         return;
  67 }
  68
  69 extern void
  70 dm_init(void) {
  71         dm_log_init(&dm_write_log);
  72         dm_log_init_verbose(conf ? conf->verbosity + 3 : 0);
  73 }
  74
  75 static int
  76 dm_libprereq (void)
  77 {
  78         char version[64];
  79         int v[3];
  80         int minv[3] = {1, 2, 8};
  81
  82         dm_get_library_version(version, sizeof(version));
  83         condlog(3, "libdevmapper version %s", version);
  84         sscanf(version, "%d.%d.%d ", &v[0], &v[1], &v[2]);
  85
  86         if ((v[0] > minv[0]) ||
  87             ((v[0] ==  minv[0]) && (v[1] > minv[1])) ||
  88             ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2])))
  89                 return 0;
  90         condlog(0, "libdevmapper version must be >= %d.%.2d.%.2d",
  91                 minv[0], minv[1], minv[2]);
  92         return 1;
  93 }
  94
  95 static int
  96 dm_drvprereq (char * str)
  97 {
  98         int r = 2;
  99         struct dm_task *dmt;
 100         struct dm_versions *target;
 101         struct dm_versions *last_target;
 102         int minv[3] = {1, 0, 3};
 103         unsigned int *v;
 104
 105         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 106                 return 3;
 107
 108         dm_task_no_open_count(dmt);
 109
 110         if (!dm_task_run(dmt)) {
 111                 condlog(0, "Can not communicate with kernel DM");
 112                 goto out;
 113         }
 114         target = dm_task_get_versions(dmt);
 115
 116         do {
 117                 last_target = target;
 118                 if (!strncmp(str, target->name, strlen(str))) {
 119                         r = 1;
 120                         break;
 121                 }
 122                 target = (void *) target + target->next;
 123         } while (last_target != target);
 124
 125         if (r == 2) {
 126                 condlog(0, "DM multipath kernel driver not loaded");
 127                 goto out;
 128         }
 129         v = target->version;
 130         if ((v[0] > minv[0]) ||
 131             ((v[0] == minv[0]) && (v[1] > minv[1])) ||
 132             ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2]))) {
 133                 r = 0;
 134                 goto out;
 135         }
 136         condlog(0, "DM multipath kernel driver must be >= %u.%.2u.%.2u",
 137                 minv[0], minv[1], minv[2]);
 138 out:
 139         dm_task_destroy(dmt);
 140         return r;
 141 }
 142
 143 extern int
 144 dm_prereq (void)
 145 {
 146         if (dm_libprereq())
 147                 return 1;
 148         return dm_drvprereq(TGT_MPATH);
 149 }
 150
 151 static int
 152 dm_simplecmd (int task, const char *name, int no_flush) {
 153         int r = 0;
 154         struct dm_task *dmt;
 155
 156         if (!(dmt = dm_task_create (task)))
 157                 return 0;
 158
 159         if (!dm_task_set_name (dmt, name))
 160                 goto out;
 161
 162         dm_task_no_open_count(dmt);
 163         dm_task_skip_lockfs(dmt);       /* for DM_DEVICE_RESUME */
 164 #ifdef LIBDM_API_FLUSH
 165         if (no_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_simplecmd_flush (int task, const char *name) {
 178         return dm_simplecmd(task, name, 0);
 179 }
 180
 181 extern int
 182 dm_simplecmd_noflush (int task, const char *name) {
 183         return dm_simplecmd(task, name, 1);
 184 }
 185
 186 extern int
 187 dm_addmap (int task, const char *name, const char *target,
 188            const char *params, unsigned long long size, const char *uuid,
 189            int ro) {
 190         int r = 0;
 191         struct dm_task *dmt;
 192         char *prefixed_uuid = NULL;
 193
 194         if (!(dmt = dm_task_create (task)))
 195                 return 0;
 196
 197         if (!dm_task_set_name (dmt, name))
 198                 goto addout;
 199
 200         if (!dm_task_add_target (dmt, 0, size, target, params))
 201                 goto addout;
 202
 203         if (ro)
 204                 dm_task_set_ro(dmt);
 205
 206         if (uuid){
 207                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
 208                 if (!prefixed_uuid) {
 209                         condlog(0, "cannot create prefixed uuid : %s\n",
 210                                 strerror(errno));
 211                         goto addout;
 212                 }
 213                 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
 214                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 215                         goto freeout;
 216         }
 217
 218         dm_task_no_open_count(dmt);
 219
 220         r = dm_task_run (dmt);
 221
 222         freeout:
 223         if (prefixed_uuid)
 224                 FREE(prefixed_uuid);
 225
 226         addout:
 227         dm_task_destroy (dmt);
 228
 229         return r;
 230 }
 231
 232 static int
 233 _dm_addmap_create (const char *name, const char *params,
 234                   unsigned long long size, const char *uuid, int ro) {
 235         int r;
 236         r = dm_addmap(DM_DEVICE_CREATE, name, TGT_MPATH, params, size, uuid,
 237                       ro);
 238         /*
 239          * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
 240          * Failing the second part leaves an empty map. Clean it up.
 241          */
 242         if (!r && dm_map_present(name)) {
 243                 condlog(3, "%s: failed to load map (a path might be in use)",
 244                         name);
 245                 dm_flush_map(name);
 246         }
 247         return r;
 248 }
 249
 250 #define ADDMAP_RW 0
 251 #define ADDMAP_RO 1
 252
 253 extern int
 254 dm_addmap_create (const char *name, const char *params,
 255                   unsigned long long size, const char *uuid) {
 256         return _dm_addmap_create(name, params, size, uuid, ADDMAP_RW);
 257 }
 258
 259 extern int
 260 dm_addmap_create_ro (const char *name, const char *params,
 261                   unsigned long long size, const char *uuid) {
 262         return _dm_addmap_create(name, params, size, uuid, ADDMAP_RO);
 263 }
 264
 265 extern int
 266 dm_addmap_reload (const char *name, const char *params,
 267                   unsigned long long size, const char *uuid) {
 268         return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
 269                          ADDMAP_RW);
 270 }
 271
 272 extern int
 273 dm_addmap_reload_ro (const char *name, const char *params,
 274                      unsigned long long size, const char *uuid) {
 275         return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
 276                          ADDMAP_RO);
 277 }
 278
 279 extern int
 280 dm_map_present (const char * str)
 281 {
 282         int r = 0;
 283         struct dm_task *dmt;
 284         struct dm_info info;
 285
 286         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 287                 return 0;
 288
 289         if (!dm_task_set_name(dmt, str))
 290                 goto out;
 291
 292         dm_task_no_open_count(dmt);
 293
 294         if (!dm_task_run(dmt))
 295                 goto out;
 296
 297         if (!dm_task_get_info(dmt, &info))
 298                 goto out;
 299
 300         if (info.exists)
 301                 r = 1;
 302 out:
 303         dm_task_destroy(dmt);
 304         return r;
 305 }
 306
 307 extern int
 308 dm_get_map(char * name, unsigned long long * size, char * outparams)
 309 {
 310         int r = 1;
 311         struct dm_task *dmt;
 312         void *next = NULL;
 313         uint64_t start, length;
 314         char *target_type = NULL;
 315         char *params = NULL;
 316
 317         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 318                 return 1;
 319
 320         if (!dm_task_set_name(dmt, name))
 321                 goto out;
 322
 323         dm_task_no_open_count(dmt);
 324
 325         if (!dm_task_run(dmt))
 326                 goto out;
 327
 328         /* Fetch 1st target */
 329         next = dm_get_next_target(dmt, next, &start, &length,
 330                                   &target_type, &params);
 331
 332         if (size)
 333                 *size = length;
 334
 335         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 336                 r = 0;
 337 out:
 338         dm_task_destroy(dmt);
 339         return r;
 340 }
 341
 342 extern int
 343 dm_get_uuid(char *name, char *uuid)
 344 {
 345         struct dm_task *dmt;
 346         const char *uuidtmp;
 347         int r = 1;
 348
 349         dmt = dm_task_create(DM_DEVICE_INFO);
 350         if (!dmt)
 351                 return 1;
 352
 353         if (!dm_task_set_name (dmt, name))
 354                 goto uuidout;
 355
 356         if (!dm_task_run(dmt))
 357                 goto uuidout;
 358
 359         uuidtmp = dm_task_get_uuid(dmt);
 360         if (uuidtmp) {
 361                 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 362                         strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 363                 else
 364                         strcpy(uuid, uuidtmp);
 365         }
 366         else
 367                 uuid[0] = '\0';
 368
 369         r = 0;
 370 uuidout:
 371         dm_task_destroy(dmt);
 372         return r;
 373 }
 374
 375 extern int
 376 dm_get_status(char * name, char * outstatus)
 377 {
 378         int r = 1;
 379         struct dm_task *dmt;
 380         void *next = NULL;
 381         uint64_t start, length;
 382         char *target_type;
 383         char *status;
 384
 385         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 386                 return 1;
 387
 388         if (!dm_task_set_name(dmt, name))
 389                 goto out;
 390
 391         dm_task_no_open_count(dmt);
 392
 393         if (!dm_task_run(dmt))
 394                 goto out;
 395
 396         /* Fetch 1st target */
 397         next = dm_get_next_target(dmt, next, &start, &length,
 398                                   &target_type, &status);
 399
 400         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 401                 r = 0;
 402 out:
 403         if (r)
 404                 condlog(0, "%s: error getting map status string", name);
 405
 406         dm_task_destroy(dmt);
 407         return r;
 408 }
 409
 410 /*
 411  * returns:
 412  *    1 : match
 413  *    0 : no match
 414  *   -1 : empty map
 415  */
 416 extern int
 417 dm_type(const char * name, char * type)
 418 {
 419         int r = 0;
 420         struct dm_task *dmt;
 421         void *next = NULL;
 422         uint64_t start, length;
 423         char *target_type = NULL;
 424         char *params;
 425
 426         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 427                 return 0;
 428
 429         if (!dm_task_set_name(dmt, name))
 430                 goto out;
 431
 432         dm_task_no_open_count(dmt);
 433
 434         if (!dm_task_run(dmt))
 435                 goto out;
 436
 437         /* Fetch 1st target */
 438         next = dm_get_next_target(dmt, next, &start, &length,
 439                                   &target_type, &params);
 440
 441         if (!target_type)
 442                 r = -1;
 443         else if (!strcmp(target_type, type))
 444                 r = 1;
 445
 446 out:
 447         dm_task_destroy(dmt);
 448         return r;
 449 }
 450
 451 static int
 452 dm_dev_t (const char * mapname, char * dev_t, int len)
 453 {
 454         int r = 1;
 455         struct dm_task *dmt;
 456         struct dm_info info;
 457
 458         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 459                 return 0;
 460
 461         if (!dm_task_set_name(dmt, mapname))
 462                 goto out;
 463
 464         if (!dm_task_run(dmt))
 465                 goto out;
 466
 467         if (!dm_task_get_info(dmt, &info))
 468                 goto out;
 469
 470         r = info.open_count;
 471         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 472                     goto out;
 473
 474         r = 0;
 475 out:
 476         dm_task_destroy(dmt);
 477         return r;
 478 }
 479
 480 int
 481 dm_get_opencount (const char * mapname)
 482 {
 483         int r = -1;
 484         struct dm_task *dmt;
 485         struct dm_info info;
 486
 487         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 488                 return 0;
 489
 490         if (!dm_task_set_name(dmt, mapname))
 491                 goto out;
 492
 493         if (!dm_task_run(dmt))
 494                 goto out;
 495
 496         if (!dm_task_get_info(dmt, &info))
 497                 goto out;
 498
 499         r = info.open_count;
 500 out:
 501         dm_task_destroy(dmt);
 502         return r;
 503 }
 504
 505 int
 506 dm_get_minor (char * mapname)
 507 {
 508         int r = -1;
 509         struct dm_task *dmt;
 510         struct dm_info info;
 511
 512         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 513                 return 0;
 514
 515         if (!dm_task_set_name(dmt, mapname))
 516                 goto out;
 517
 518         if (!dm_task_run(dmt))
 519                 goto out;
 520
 521         if (!dm_task_get_info(dmt, &info))
 522                 goto out;
 523
 524         r = info.minor;
 525 out:
 526         dm_task_destroy(dmt);
 527         return r;
 528 }
 529
 530 extern int
 531 dm_flush_map (const char * mapname)
 532 {
 533         int r;
 534
 535         if (!dm_map_present(mapname))
 536                 return 0;
 537
 538         if (dm_type(mapname, TGT_MPATH) <= 0)
 539                 return 0; /* nothing to do */
 540
 541         if (dm_remove_partmaps(mapname))
 542                 return 1;
 543
 544         if (dm_get_opencount(mapname)) {
 545                 condlog(2, "%s: map in use", mapname);
 546                 return 1;
 547         }
 548
 549         r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname);
 550
 551         if (r) {
 552                 condlog(4, "multipath map %s removed", mapname);
 553                 return 0;
 554         }
 555         return 1;
 556 }
 557
 558 extern int
 559 dm_flush_maps (void)
 560 {
 561         int r = 0;
 562         struct dm_task *dmt;
 563         struct dm_names *names;
 564         unsigned next = 0;
 565
 566         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 567                 return 0;
 568
 569         dm_task_no_open_count(dmt);
 570
 571         if (!dm_task_run (dmt))
 572                 goto out;
 573
 574         if (!(names = dm_task_get_names (dmt)))
 575                 goto out;
 576
 577         if (!names->dev)
 578                 goto out;
 579
 580         do {
 581                 r |= dm_flush_map(names->name);
 582                 next = names->next;
 583                 names = (void *) names + next;
 584         } while (next);
 585
 586         out:
 587         dm_task_destroy (dmt);
 588         return r;
 589 }
 590
 591 int
 592 dm_message(char * mapname, char * message)
 593 {
 594         int r = 1;
 595         struct dm_task *dmt;
 596
 597         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 598                 return 1;
 599
 600         if (!dm_task_set_name(dmt, mapname))
 601                 goto out;
 602
 603         if (!dm_task_set_sector(dmt, 0))
 604                 goto out;
 605
 606         if (!dm_task_set_message(dmt, message))
 607                 goto out;
 608
 609         dm_task_no_open_count(dmt);
 610
 611         if (!dm_task_run(dmt))
 612                 goto out;
 613
 614         r = 0;
 615 out:
 616         if (r)
 617                 condlog(0, "DM message failed [%s]", message);
 618
 619         dm_task_destroy(dmt);
 620         return r;
 621 }
 622
 623 int
 624 dm_fail_path(char * mapname, char * path)
 625 {
 626         char message[32];
 627
 628         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 629                 return 1;
 630
 631         return dm_message(mapname, message);
 632 }
 633
 634 int
 635 dm_reinstate_path(char * mapname, char * path)
 636 {
 637         char message[32];
 638
 639         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 640                 return 1;
 641
 642         return dm_message(mapname, message);
 643 }
 644
 645 int
 646 dm_queue_if_no_path(char *mapname, int enable)
 647 {
 648         char *message;
 649
 650         if (enable)
 651                 message = "queue_if_no_path\n";
 652         else
 653                 message = "fail_if_no_path\n";
 654
 655         return dm_message(mapname, message);
 656 }
 657
 658 int
 659 dm_set_pg_timeout(char *mapname, int timeout_val)
 660 {
 661         char message[24];
 662
 663         if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
 664                 return 1;
 665         return dm_message(mapname, message);
 666 }
 667
 668 static int
 669 dm_groupmsg (char * msg, char * mapname, int index)
 670 {
 671         char message[32];
 672
 673         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 674                 return 1;
 675
 676         return dm_message(mapname, message);
 677 }
 678
 679 int
 680 dm_switchgroup(char * mapname, int index)
 681 {
 682         return dm_groupmsg("switch", mapname, index);
 683 }
 684
 685 int
 686 dm_enablegroup(char * mapname, int index)
 687 {
 688         return dm_groupmsg("enable", mapname, index);
 689 }
 690
 691 int
 692 dm_disablegroup(char * mapname, int index)
 693 {
 694         return dm_groupmsg("disable", mapname, index);
 695 }
 696
 697 int
 698 dm_get_maps (vector mp)
 699 {
 700         struct multipath * mpp;
 701         int r = 1;
 702         int info;
 703         struct dm_task *dmt;
 704         struct dm_names *names;
 705         unsigned next = 0;
 706
 707         if (!mp)
 708                 return 1;
 709
 710         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 711                 return 1;
 712
 713         dm_task_no_open_count(dmt);
 714
 715         if (!dm_task_run(dmt))
 716                 goto out;
 717
 718         if (!(names = dm_task_get_names(dmt)))
 719                 goto out;
 720
 721         if (!names->dev) {
 722                 r = 0; /* this is perfectly valid */
 723                 goto out;
 724         }
 725
 726         do {
 727                 info = dm_type(names->name, TGT_MPATH);
 728
 729                 if (info <= 0)
 730                         goto next;
 731
 732                 mpp = alloc_multipath();
 733
 734                 if (!mpp)
 735                         goto out;
 736
 737                 mpp->alias = STRDUP(names->name);
 738
 739                 if (!mpp->alias)
 740                         goto out1;
 741
 742                 if (info > 0) {
 743                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 744                                 goto out1;
 745
 746                         if (dm_get_status(names->name, mpp->status))
 747                                 goto out1;
 748
 749                         dm_get_uuid(names->name, mpp->wwid);
 750                         dm_get_info(names->name, &mpp->dmi);
 751                 }
 752
 753                 if (!vector_alloc_slot(mp))
 754                         goto out1;
 755
 756                 vector_set_slot(mp, mpp);
 757                 mpp = NULL;
 758 next:
 759                 next = names->next;
 760                 names = (void *) names + next;
 761         } while (next);
 762
 763         r = 0;
 764         goto out;
 765 out1:
 766         free_multipath(mpp, KEEP_PATHS);
 767 out:
 768         dm_task_destroy (dmt);
 769         return r;
 770 }
 771
 772 extern int
 773 dm_get_name(char *uuid, char *name)
 774 {
 775         vector vec;
 776         struct multipath *mpp;
 777         int i, rc = 0;
 778
 779         vec = vector_alloc();
 780
 781         if (!vec)
 782                 return 0;
 783
 784         if (dm_get_maps(vec)) {
 785                 goto out;
 786         }
 787
 788         vector_foreach_slot(vec, mpp, i) {
 789                 if (!strcmp(uuid, mpp->wwid)) {
 790                         strcpy(name, mpp->alias);
 791                         rc=1;
 792                         break;
 793                 }
 794         }
 795 out:
 796         vector_foreach_slot(vec, mpp, i) {
 797                 free_multipath(mpp, KEEP_PATHS);
 798         }
 799         vector_free(vec);
 800         return rc;
 801 }
 802
 803 int
 804 dm_geteventnr (char *name)
 805 {
 806         struct dm_task *dmt;
 807         struct dm_info info;
 808
 809         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 810                 return 0;
 811
 812         if (!dm_task_set_name(dmt, name))
 813                 goto out;
 814
 815         dm_task_no_open_count(dmt);
 816
 817         if (!dm_task_run(dmt))
 818                 goto out;
 819
 820         if (!dm_task_get_info(dmt, &info)) {
 821                 info.event_nr = 0;
 822                 goto out;
 823         }
 824
 825         if (!info.exists) {
 826                 info.event_nr = 0;
 827                 goto out;
 828         }
 829
 830 out:
 831         dm_task_destroy(dmt);
 832
 833         return info.event_nr;
 834 }
 835
 836 char *
 837 dm_mapname(int major, int minor)
 838 {
 839         char * response = NULL;
 840         const char *map;
 841         struct dm_task *dmt;
 842         int r;
 843         int loop = MAX_WAIT * LOOPS_PER_SEC;
 844
 845         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 846                 return NULL;
 847
 848         if (!dm_task_set_major(dmt, major) ||
 849             !dm_task_set_minor(dmt, minor))
 850                 goto bad;
 851
 852         dm_task_no_open_count(dmt);
 853
 854         /*
 855          * device map might not be ready when we get here from
 856          * daemon uev_trigger -> uev_add_map
 857          */
 858         while (--loop) {
 859                 r = dm_task_run(dmt);
 860
 861                 if (r)
 862                         break;
 863
 864                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 865         }
 866
 867         if (!r) {
 868                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 869                 goto bad;
 870         }
 871
 872         map = dm_task_get_name(dmt);
 873         if (map && strlen(map))
 874                 response = STRDUP((char *)dm_task_get_name(dmt));
 875
 876         dm_task_destroy(dmt);
 877         return response;
 878 bad:
 879         dm_task_destroy(dmt);
 880         condlog(0, "%i:%i: error fetching map name", major, minor);
 881         return NULL;
 882 }
 883
 884 int
 885 dm_remove_partmaps (const char * mapname)
 886 {
 887         struct dm_task *dmt;
 888         struct dm_names *names;
 889         unsigned next = 0;
 890         char params[PARAMS_SIZE];
 891         unsigned long long size;
 892         char dev_t[32];
 893         int r = 1;
 894
 895         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 896                 return 1;
 897
 898         dm_task_no_open_count(dmt);
 899
 900         if (!dm_task_run(dmt))
 901                 goto out;
 902
 903         if (!(names = dm_task_get_names(dmt)))
 904                 goto out;
 905
 906         if (!names->dev) {
 907                 r = 0; /* this is perfectly valid */
 908                 goto out;
 909         }
 910
 911         if (dm_dev_t(mapname, &dev_t[0], 32))
 912                 goto out;
 913
 914         do {
 915                 if (
 916                     /*
 917                      * if devmap target is "linear"
 918                      */
 919                     (dm_type(names->name, TGT_PART) > 0) &&
 920
 921                     /*
 922                      * and the multipath mapname and the part mapname start
 923                      * the same
 924                      */
 925                     !strncmp(names->name, mapname, strlen(mapname)) &&
 926
 927                     /*
 928                      * and the opencount is 0 for us to allow removal
 929                      */
 930                     !dm_get_opencount(names->name) &&
 931
 932                     /*
 933                      * and we can fetch the map table from the kernel
 934                      */
 935                     !dm_get_map(names->name, &size, &params[0]) &&
 936
 937                     /*
 938                      * and the table maps over the multipath map
 939                      */
 940                     strstr(params, dev_t)
 941                    ) {
 942                                 /*
 943                                  * then it's a kpartx generated partition.
 944                                  * remove it.
 945                                  */
 946                                 condlog(4, "partition map %s removed",
 947                                         names->name);
 948                                 dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name);
 949                    }
 950
 951                 next = names->next;
 952                 names = (void *) names + next;
 953         } while (next);
 954
 955         r = 0;
 956 out:
 957         dm_task_destroy (dmt);
 958         return r;
 959 }
 960
 961 static struct dm_info *
 962 alloc_dminfo (void)
 963 {
 964         return MALLOC(sizeof(struct dm_info));
 965 }
 966
 967 int
 968 dm_get_info (char * mapname, struct dm_info ** dmi)
 969 {
 970         int r = 1;
 971         struct dm_task *dmt = NULL;
 972
 973         if (!mapname)
 974                 return 1;
 975
 976         if (!*dmi)
 977                 *dmi = alloc_dminfo();
 978
 979         if (!*dmi)
 980                 return 1;
 981
 982         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 983                 goto out;
 984
 985         if (!dm_task_set_name(dmt, mapname))
 986                 goto out;
 987
 988         dm_task_no_open_count(dmt);
 989
 990         if (!dm_task_run(dmt))
 991                 goto out;
 992
 993         if (!dm_task_get_info(dmt, *dmi))
 994                 goto out;
 995
 996         r = 0;
 997 out:
 998         if (r) {
 999                 memset(*dmi, 0, sizeof(struct dm_info));
1000                 FREE(*dmi);
1001                 *dmi = NULL;
1002         }
1003
1004         if (dmt)
1005                 dm_task_destroy(dmt);
1006
1007         return r;
1008 }
1009
1010 int
1011 dm_rename_partmaps (char * old, char * new)
1012 {
1013         struct dm_task *dmt;
1014         struct dm_names *names;
1015         unsigned next = 0;
1016         char buff[PARAMS_SIZE];
1017         unsigned long long size;
1018         char dev_t[32];
1019         int r = 1;
1020
1021         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1022                 return 1;
1023
1024         dm_task_no_open_count(dmt);
1025
1026         if (!dm_task_run(dmt))
1027                 goto out;
1028
1029         if (!(names = dm_task_get_names(dmt)))
1030                 goto out;
1031
1032         if (!names->dev) {
1033                 r = 0; /* this is perfectly valid */
1034                 goto out;
1035         }
1036
1037         if (dm_dev_t(old, &dev_t[0], 32))
1038                 goto out;
1039
1040         do {
1041                 if (
1042                     /*
1043                      * if devmap target is "linear"
1044                      */
1045                     (dm_type(names->name, TGT_PART) > 0) &&
1046
1047                     /*
1048                      * and the multipath mapname and the part mapname start
1049                      * the same
1050                      */
1051                     !strncmp(names->name, old, strlen(old)) &&
1052
1053                     /*
1054                      * and we can fetch the map table from the kernel
1055                      */
1056                     !dm_get_map(names->name, &size, &buff[0]) &&
1057
1058                     /*
1059                      * and the table maps over the multipath map
1060                      */
1061                     strstr(buff, dev_t)
1062                    ) {
1063                                 /*
1064                                  * then it's a kpartx generated partition.
1065                                  * Rename it.
1066                                  */
1067                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1068                                          new, names->name + strlen(old));
1069                                 dm_rename(names->name, buff);
1070                                 condlog(4, "partition map %s renamed",
1071                                         names->name);
1072                    }
1073
1074                 next = names->next;
1075                 names = (void *) names + next;
1076         } while (next);
1077
1078         r = 0;
1079 out:
1080         dm_task_destroy (dmt);
1081         return r;
1082 }
1083
1084 int
1085 dm_rename (char * old, char * new)
1086 {
1087         int r = 0;
1088         struct dm_task *dmt;
1089
1090         if (dm_rename_partmaps(old, new))
1091                 return r;
1092
1093         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1094                 return r;
1095
1096         if (!dm_task_set_name(dmt, old))
1097                 goto out;
1098
1099         if (!dm_task_set_newname(dmt, new))
1100                 goto out;
1101
1102         dm_task_no_open_count(dmt);
1103
1104         if (!dm_task_run(dmt))
1105                 goto out;
1106
1107         r = 1;
1108 out:
1109         dm_task_destroy(dmt);
1110         return r;
1111 }