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 static int
 153 dm_simplecmd (int task, const char *name, int no_flush) {
 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         if (no_flush)
 167                 dm_task_no_flush(dmt);          /* for DM_DEVICE_SUSPEND/RESUME */
 168 #endif
 169
 170         r = dm_task_run (dmt);
 171
 172         out:
 173         dm_task_destroy (dmt);
 174         return r;
 175 }
 176
 177 extern int
 178 dm_simplecmd_flush (int task, const char *name) {
 179         return dm_simplecmd(task, name, 0);
 180 }
 181
 182 extern int
 183 dm_simplecmd_noflush (int task, const char *name) {
 184         return dm_simplecmd(task, name, 1);
 185 }
 186
 187 extern int
 188 dm_addmap (int task, const char *name, const char *target,
 189            const char *params, unsigned long long size, const char *uuid,
 190            int ro) {
 191         int r = 0;
 192         struct dm_task *dmt;
 193         char *prefixed_uuid = NULL;
 194
 195         if (!(dmt = dm_task_create (task)))
 196                 return 0;
 197
 198         if (!dm_task_set_name (dmt, name))
 199                 goto addout;
 200
 201         if (!dm_task_add_target (dmt, 0, size, target, params))
 202                 goto addout;
 203
 204         if (ro)
 205                 dm_task_set_ro(dmt);
 206
 207         if (uuid){
 208                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
 209                 if (!prefixed_uuid) {
 210                         condlog(0, "cannot create prefixed uuid : %s\n",
 211                                 strerror(errno));
 212                         goto addout;
 213                 }
 214                 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
 215                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 216                         goto freeout;
 217         }
 218
 219         dm_task_no_open_count(dmt);
 220
 221         r = dm_task_run (dmt);
 222
 223         freeout:
 224         if (prefixed_uuid)
 225                 FREE(prefixed_uuid);
 226
 227         addout:
 228         dm_task_destroy (dmt);
 229
 230         return r;
 231 }
 232
 233 static int
 234 _dm_addmap_create (const char *name, const char *params,
 235                   unsigned long long size, const char *uuid, int ro) {
 236         int r;
 237         r = dm_addmap(DM_DEVICE_CREATE, name, TGT_MPATH, params, size, uuid,
 238                       ro);
 239         /*
 240          * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
 241          * Failing the second part leaves an empty map. Clean it up.
 242          */
 243         if (!r && dm_map_present(name)) {
 244                 condlog(3, "%s: failed to load map (a path might be in use)",
 245                         name);
 246                 dm_flush_map(name);
 247         }
 248         return r;
 249 }
 250
 251 #define ADDMAP_RW 0
 252 #define ADDMAP_RO 1
 253
 254 extern int
 255 dm_addmap_create (const char *name, const char *params,
 256                   unsigned long long size, const char *uuid) {
 257         return _dm_addmap_create(name, params, size, uuid, ADDMAP_RW);
 258 }
 259
 260 extern int
 261 dm_addmap_create_ro (const char *name, const char *params,
 262                   unsigned long long size, const char *uuid) {
 263         return _dm_addmap_create(name, params, size, uuid, ADDMAP_RO);
 264 }
 265
 266 extern int
 267 dm_addmap_reload (const char *name, const char *params,
 268                   unsigned long long size, const char *uuid) {
 269         return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
 270                          ADDMAP_RW);
 271 }
 272
 273 extern int
 274 dm_addmap_reload_ro (const char *name, const char *params,
 275                      unsigned long long size, const char *uuid) {
 276         return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
 277                          ADDMAP_RO);
 278 }
 279
 280 extern int
 281 dm_map_present (const char * str)
 282 {
 283         int r = 0;
 284         struct dm_task *dmt;
 285         struct dm_info info;
 286
 287         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 288                 return 0;
 289
 290         if (!dm_task_set_name(dmt, str))
 291                 goto out;
 292
 293         dm_task_no_open_count(dmt);
 294
 295         if (!dm_task_run(dmt))
 296                 goto out;
 297
 298         if (!dm_task_get_info(dmt, &info))
 299                 goto out;
 300
 301         if (info.exists)
 302                 r = 1;
 303 out:
 304         dm_task_destroy(dmt);
 305         return r;
 306 }
 307
 308 extern int
 309 dm_get_map(char * name, unsigned long long * size, char * outparams)
 310 {
 311         int r = 1;
 312         struct dm_task *dmt;
 313         void *next = NULL;
 314         uint64_t start, length;
 315         char *target_type = NULL;
 316         char *params = NULL;
 317
 318         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 319                 return 1;
 320
 321         if (!dm_task_set_name(dmt, name))
 322                 goto out;
 323
 324         dm_task_no_open_count(dmt);
 325
 326         if (!dm_task_run(dmt))
 327                 goto out;
 328
 329         /* Fetch 1st target */
 330         next = dm_get_next_target(dmt, next, &start, &length,
 331                                   &target_type, &params);
 332
 333         if (size)
 334                 *size = length;
 335
 336         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 337                 r = 0;
 338 out:
 339         dm_task_destroy(dmt);
 340         return r;
 341 }
 342
 343 extern int
 344 dm_get_uuid(char *name, char *uuid)
 345 {
 346         struct dm_task *dmt;
 347         const char *uuidtmp;
 348         int r = 1;
 349
 350         dmt = dm_task_create(DM_DEVICE_INFO);
 351         if (!dmt)
 352                 return 1;
 353
 354         if (!dm_task_set_name (dmt, name))
 355                 goto uuidout;
 356
 357         if (!dm_task_run(dmt))
 358                 goto uuidout;
 359
 360         uuidtmp = dm_task_get_uuid(dmt);
 361         if (uuidtmp) {
 362                 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 363                         strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 364                 else
 365                         strcpy(uuid, uuidtmp);
 366         }
 367         else
 368                 uuid[0] = '\0';
 369
 370         r = 0;
 371 uuidout:
 372         dm_task_destroy(dmt);
 373         return r;
 374 }
 375
 376 extern int
 377 dm_get_status(char * name, char * outstatus)
 378 {
 379         int r = 1;
 380         struct dm_task *dmt;
 381         void *next = NULL;
 382         uint64_t start, length;
 383         char *target_type;
 384         char *status;
 385
 386         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 387                 return 1;
 388
 389         if (!dm_task_set_name(dmt, name))
 390                 goto out;
 391
 392         dm_task_no_open_count(dmt);
 393
 394         if (!dm_task_run(dmt))
 395                 goto out;
 396
 397         /* Fetch 1st target */
 398         next = dm_get_next_target(dmt, next, &start, &length,
 399                                   &target_type, &status);
 400
 401         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 402                 r = 0;
 403 out:
 404         if (r)
 405                 condlog(0, "%s: error getting map status string", name);
 406
 407         dm_task_destroy(dmt);
 408         return r;
 409 }
 410
 411 /*
 412  * returns:
 413  *    1 : match
 414  *    0 : no match
 415  *   -1 : empty map
 416  */
 417 extern int
 418 dm_type(const char * name, char * type)
 419 {
 420         int r = 0;
 421         struct dm_task *dmt;
 422         void *next = NULL;
 423         uint64_t start, length;
 424         char *target_type = NULL;
 425         char *params;
 426
 427         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 428                 return 0;
 429
 430         if (!dm_task_set_name(dmt, name))
 431                 goto out;
 432
 433         dm_task_no_open_count(dmt);
 434
 435         if (!dm_task_run(dmt))
 436                 goto out;
 437
 438         /* Fetch 1st target */
 439         next = dm_get_next_target(dmt, next, &start, &length,
 440                                   &target_type, &params);
 441
 442         if (!target_type)
 443                 r = -1;
 444         else if (!strcmp(target_type, type))
 445                 r = 1;
 446
 447 out:
 448         dm_task_destroy(dmt);
 449         return r;
 450 }
 451
 452 static int
 453 dm_dev_t (const char * mapname, char * dev_t, int len)
 454 {
 455         int r = 1;
 456         struct dm_task *dmt;
 457         struct dm_info info;
 458
 459         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 460                 return 0;
 461
 462         if (!dm_task_set_name(dmt, mapname))
 463                 goto out;
 464
 465         if (!dm_task_run(dmt))
 466                 goto out;
 467
 468         if (!dm_task_get_info(dmt, &info))
 469                 goto out;
 470
 471         r = info.open_count;
 472         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 473                     goto out;
 474
 475         r = 0;
 476 out:
 477         dm_task_destroy(dmt);
 478         return r;
 479 }
 480
 481 int
 482 dm_get_opencount (const char * mapname)
 483 {
 484         int r = -1;
 485         struct dm_task *dmt;
 486         struct dm_info info;
 487
 488         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 489                 return 0;
 490
 491         if (!dm_task_set_name(dmt, mapname))
 492                 goto out;
 493
 494         if (!dm_task_run(dmt))
 495                 goto out;
 496
 497         if (!dm_task_get_info(dmt, &info))
 498                 goto out;
 499
 500         r = info.open_count;
 501 out:
 502         dm_task_destroy(dmt);
 503         return r;
 504 }
 505
 506 int
 507 dm_get_minor (char * mapname)
 508 {
 509         int r = -1;
 510         struct dm_task *dmt;
 511         struct dm_info info;
 512
 513         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 514                 return 0;
 515
 516         if (!dm_task_set_name(dmt, mapname))
 517                 goto out;
 518
 519         if (!dm_task_run(dmt))
 520                 goto out;
 521
 522         if (!dm_task_get_info(dmt, &info))
 523                 goto out;
 524
 525         r = info.minor;
 526 out:
 527         dm_task_destroy(dmt);
 528         return r;
 529 }
 530
 531 extern int
 532 dm_flush_map (const char * mapname)
 533 {
 534         int r;
 535
 536         if (!dm_map_present(mapname))
 537                 return 0;
 538
 539         if (dm_type(mapname, TGT_MPATH) <= 0)
 540                 return 0; /* nothing to do */
 541
 542         if (dm_remove_partmaps(mapname))
 543                 return 1;
 544
 545         if (dm_get_opencount(mapname)) {
 546                 condlog(2, "%s: map in use", mapname);
 547                 return 1;
 548         }
 549
 550         r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname);
 551
 552         if (r) {
 553                 condlog(4, "multipath map %s removed", mapname);
 554                 return 0;
 555         }
 556         return 1;
 557 }
 558
 559 extern int
 560 dm_flush_maps (void)
 561 {
 562         int r = 0;
 563         struct dm_task *dmt;
 564         struct dm_names *names;
 565         unsigned next = 0;
 566
 567         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 568                 return 0;
 569
 570         dm_task_no_open_count(dmt);
 571
 572         if (!dm_task_run (dmt))
 573                 goto out;
 574
 575         if (!(names = dm_task_get_names (dmt)))
 576                 goto out;
 577
 578         if (!names->dev)
 579                 goto out;
 580
 581         do {
 582                 r |= dm_flush_map(names->name);
 583                 next = names->next;
 584                 names = (void *) names + next;
 585         } while (next);
 586
 587         out:
 588         dm_task_destroy (dmt);
 589         return r;
 590 }
 591
 592 int
 593 dm_message(char * mapname, char * message)
 594 {
 595         int r = 1;
 596         struct dm_task *dmt;
 597
 598         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 599                 return 1;
 600
 601         if (!dm_task_set_name(dmt, mapname))
 602                 goto out;
 603
 604         if (!dm_task_set_sector(dmt, 0))
 605                 goto out;
 606
 607         if (!dm_task_set_message(dmt, message))
 608                 goto out;
 609
 610         dm_task_no_open_count(dmt);
 611
 612         if (!dm_task_run(dmt))
 613                 goto out;
 614
 615         r = 0;
 616 out:
 617         if (r)
 618                 condlog(0, "DM message failed [%s]", message);
 619
 620         dm_task_destroy(dmt);
 621         return r;
 622 }
 623
 624 int
 625 dm_fail_path(char * mapname, char * path)
 626 {
 627         char message[32];
 628
 629         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 630                 return 1;
 631
 632         return dm_message(mapname, message);
 633 }
 634
 635 int
 636 dm_reinstate_path(char * mapname, char * path)
 637 {
 638         char message[32];
 639
 640         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 641                 return 1;
 642
 643         return dm_message(mapname, message);
 644 }
 645
 646 int
 647 dm_queue_if_no_path(char *mapname, int enable)
 648 {
 649         char *message;
 650
 651         if (enable)
 652                 message = "queue_if_no_path\n";
 653         else
 654                 message = "fail_if_no_path\n";
 655
 656         return dm_message(mapname, message);
 657 }
 658
 659 int
 660 dm_set_pg_timeout(char *mapname, int timeout_val)
 661 {
 662         char message[24];
 663
 664         if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
 665                 return 1;
 666         return dm_message(mapname, message);
 667 }
 668
 669 static int
 670 dm_groupmsg (char * msg, char * mapname, int index)
 671 {
 672         char message[32];
 673
 674         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 675                 return 1;
 676
 677         return dm_message(mapname, message);
 678 }
 679
 680 int
 681 dm_switchgroup(char * mapname, int index)
 682 {
 683         return dm_groupmsg("switch", mapname, index);
 684 }
 685
 686 int
 687 dm_enablegroup(char * mapname, int index)
 688 {
 689         return dm_groupmsg("enable", mapname, index);
 690 }
 691
 692 int
 693 dm_disablegroup(char * mapname, int index)
 694 {
 695         return dm_groupmsg("disable", mapname, index);
 696 }
 697
 698 int
 699 dm_get_maps (vector mp)
 700 {
 701         struct multipath * mpp;
 702         int r = 1;
 703         int info;
 704         struct dm_task *dmt;
 705         struct dm_names *names;
 706         unsigned next = 0;
 707
 708         if (!mp)
 709                 return 1;
 710
 711         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 712                 return 1;
 713
 714         dm_task_no_open_count(dmt);
 715
 716         if (!dm_task_run(dmt))
 717                 goto out;
 718
 719         if (!(names = dm_task_get_names(dmt)))
 720                 goto out;
 721
 722         if (!names->dev) {
 723                 r = 0; /* this is perfectly valid */
 724                 goto out;
 725         }
 726
 727         do {
 728                 info = dm_type(names->name, TGT_MPATH);
 729
 730                 if (info <= 0)
 731                         goto next;
 732
 733                 mpp = alloc_multipath();
 734
 735                 if (!mpp)
 736                         goto out;
 737
 738                 mpp->alias = STRDUP(names->name);
 739
 740                 if (!mpp->alias)
 741                         goto out1;
 742
 743                 if (info > 0) {
 744                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 745                                 goto out1;
 746
 747                         if (dm_get_status(names->name, mpp->status))
 748                                 goto out1;
 749
 750                         dm_get_uuid(names->name, mpp->wwid);
 751                         dm_get_info(names->name, &mpp->dmi);
 752                 }
 753
 754                 if (!vector_alloc_slot(mp))
 755                         goto out1;
 756
 757                 vector_set_slot(mp, mpp);
 758                 mpp = NULL;
 759 next:
 760                 next = names->next;
 761                 names = (void *) names + next;
 762         } while (next);
 763
 764         r = 0;
 765         goto out;
 766 out1:
 767         free_multipath(mpp, KEEP_PATHS);
 768 out:
 769         dm_task_destroy (dmt);
 770         return r;
 771 }
 772
 773 extern int
 774 dm_get_name(char *uuid, char *name)
 775 {
 776         vector vec;
 777         struct multipath *mpp;
 778         int i, rc = 0;
 779
 780         vec = vector_alloc();
 781
 782         if (!vec)
 783                 return 0;
 784
 785         if (dm_get_maps(vec)) {
 786                 goto out;
 787         }
 788
 789         vector_foreach_slot(vec, mpp, i) {
 790                 if (!strcmp(uuid, mpp->wwid)) {
 791                         strcpy(name, mpp->alias);
 792                         rc=1;
 793                         break;
 794                 }
 795         }
 796 out:
 797         vector_foreach_slot(vec, mpp, i) {
 798                 free_multipath(mpp, KEEP_PATHS);
 799         }
 800         vector_free(vec);
 801         return rc;
 802 }
 803
 804 int
 805 dm_geteventnr (char *name)
 806 {
 807         struct dm_task *dmt;
 808         struct dm_info info;
 809
 810         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 811                 return 0;
 812
 813         if (!dm_task_set_name(dmt, name))
 814                 goto out;
 815
 816         dm_task_no_open_count(dmt);
 817
 818         if (!dm_task_run(dmt))
 819                 goto out;
 820
 821         if (!dm_task_get_info(dmt, &info)) {
 822                 info.event_nr = 0;
 823                 goto out;
 824         }
 825
 826         if (!info.exists) {
 827                 info.event_nr = 0;
 828                 goto out;
 829         }
 830
 831 out:
 832         dm_task_destroy(dmt);
 833
 834         return info.event_nr;
 835 }
 836
 837 char *
 838 dm_mapname(int major, int minor)
 839 {
 840         char * response = NULL;
 841         const char *map;
 842         struct dm_task *dmt;
 843         int r;
 844         int loop = MAX_WAIT * LOOPS_PER_SEC;
 845
 846         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 847                 return NULL;
 848
 849         if (!dm_task_set_major(dmt, major) ||
 850             !dm_task_set_minor(dmt, minor))
 851                 goto bad;
 852
 853         dm_task_no_open_count(dmt);
 854
 855         /*
 856          * device map might not be ready when we get here from
 857          * daemon uev_trigger -> uev_add_map
 858          */
 859         while (--loop) {
 860                 r = dm_task_run(dmt);
 861
 862                 if (r)
 863                         break;
 864
 865                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 866         }
 867
 868         if (!r) {
 869                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 870                 goto bad;
 871         }
 872
 873         map = dm_task_get_name(dmt);
 874         if (map && strlen(map))
 875                 response = STRDUP((char *)dm_task_get_name(dmt));
 876
 877         dm_task_destroy(dmt);
 878         return response;
 879 bad:
 880         dm_task_destroy(dmt);
 881         condlog(0, "%i:%i: error fetching map name", major, minor);
 882         return NULL;
 883 }
 884
 885 int
 886 dm_remove_partmaps (const char * mapname)
 887 {
 888         struct dm_task *dmt;
 889         struct dm_names *names;
 890         unsigned next = 0;
 891         char params[PARAMS_SIZE];
 892         unsigned long long size;
 893         char dev_t[32];
 894         int r = 1;
 895
 896         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 897                 return 1;
 898
 899         dm_task_no_open_count(dmt);
 900
 901         if (!dm_task_run(dmt))
 902                 goto out;
 903
 904         if (!(names = dm_task_get_names(dmt)))
 905                 goto out;
 906
 907         if (!names->dev) {
 908                 r = 0; /* this is perfectly valid */
 909                 goto out;
 910         }
 911
 912         if (dm_dev_t(mapname, &dev_t[0], 32))
 913                 goto out;
 914
 915         do {
 916                 if (
 917                     /*
 918                      * if devmap target is "linear"
 919                      */
 920                     (dm_type(names->name, TGT_PART) > 0) &&
 921
 922                     /*
 923                      * and the multipath mapname and the part mapname start
 924                      * the same
 925                      */
 926                     !strncmp(names->name, mapname, strlen(mapname)) &&
 927
 928                     /*
 929                      * and the opencount is 0 for us to allow removal
 930                      */
 931                     !dm_get_opencount(names->name) &&
 932
 933                     /*
 934                      * and we can fetch the map table from the kernel
 935                      */
 936                     !dm_get_map(names->name, &size, &params[0]) &&
 937
 938                     /*
 939                      * and the table maps over the multipath map
 940                      */
 941                     strstr(params, dev_t)
 942                    ) {
 943                                 /*
 944                                  * then it's a kpartx generated partition.
 945                                  * remove it.
 946                                  */
 947                                 condlog(4, "partition map %s removed",
 948                                         names->name);
 949                                 dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name);
 950                    }
 951
 952                 next = names->next;
 953                 names = (void *) names + next;
 954         } while (next);
 955
 956         r = 0;
 957 out:
 958         dm_task_destroy (dmt);
 959         return r;
 960 }
 961
 962 static struct dm_info *
 963 alloc_dminfo (void)
 964 {
 965         return MALLOC(sizeof(struct dm_info));
 966 }
 967
 968 int
 969 dm_get_info (char * mapname, struct dm_info ** dmi)
 970 {
 971         int r = 1;
 972         struct dm_task *dmt = NULL;
 973
 974         if (!mapname)
 975                 return 1;
 976
 977         if (!*dmi)
 978                 *dmi = alloc_dminfo();
 979
 980         if (!*dmi)
 981                 return 1;
 982
 983         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 984                 goto out;
 985
 986         if (!dm_task_set_name(dmt, mapname))
 987                 goto out;
 988
 989         dm_task_no_open_count(dmt);
 990
 991         if (!dm_task_run(dmt))
 992                 goto out;
 993
 994         if (!dm_task_get_info(dmt, *dmi))
 995                 goto out;
 996
 997         r = 0;
 998 out:
 999         if (r)
1000                 memset(*dmi, 0, sizeof(struct dm_info));
1001
1002         if (dmt)
1003                 dm_task_destroy(dmt);
1004
1005         return r;
1006 }
1007
1008 int
1009 dm_rename_partmaps (char * old, char * new)
1010 {
1011         struct dm_task *dmt;
1012         struct dm_names *names;
1013         unsigned next = 0;
1014         char buff[PARAMS_SIZE];
1015         unsigned long long size;
1016         char dev_t[32];
1017         int r = 1;
1018
1019         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1020                 return 1;
1021
1022         dm_task_no_open_count(dmt);
1023
1024         if (!dm_task_run(dmt))
1025                 goto out;
1026
1027         if (!(names = dm_task_get_names(dmt)))
1028                 goto out;
1029
1030         if (!names->dev) {
1031                 r = 0; /* this is perfectly valid */
1032                 goto out;
1033         }
1034
1035         if (dm_dev_t(old, &dev_t[0], 32))
1036                 goto out;
1037
1038         do {
1039                 if (
1040                     /*
1041                      * if devmap target is "linear"
1042                      */
1043                     (dm_type(names->name, TGT_PART) > 0) &&
1044
1045                     /*
1046                      * and the multipath mapname and the part mapname start
1047                      * the same
1048                      */
1049                     !strncmp(names->name, old, strlen(old)) &&
1050
1051                     /*
1052                      * and we can fetch the map table from the kernel
1053                      */
1054                     !dm_get_map(names->name, &size, &buff[0]) &&
1055
1056                     /*
1057                      * and the table maps over the multipath map
1058                      */
1059                     strstr(buff, dev_t)
1060                    ) {
1061                                 /*
1062                                  * then it's a kpartx generated partition.
1063                                  * Rename it.
1064                                  */
1065                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1066                                          new, names->name + strlen(old));
1067                                 dm_rename(names->name, buff);
1068                                 condlog(4, "partition map %s renamed",
1069                                         names->name);
1070                    }
1071
1072                 next = names->next;
1073                 names = (void *) names + next;
1074         } while (next);
1075
1076         r = 0;
1077 out:
1078         dm_task_destroy (dmt);
1079         return r;
1080 }
1081
1082 int
1083 dm_rename (char * old, char * new)
1084 {
1085         int r = 0;
1086         struct dm_task *dmt;
1087
1088         if (dm_rename_partmaps(old, new))
1089                 return r;
1090
1091         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1092                 return r;
1093
1094         if (!dm_task_set_name(dmt, old))
1095                 goto out;
1096
1097         if (!dm_task_set_newname(dmt, new))
1098                 goto out;
1099
1100         dm_task_no_open_count(dmt);
1101
1102         if (!dm_task_run(dmt))
1103                 goto out;
1104
1105         r = 1;
1106 out:
1107         dm_task_destroy(dmt);
1108         return r;
1109 }