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, 1);
 180 }
 181
 182 extern int
 183 dm_simplecmd_noflush (int task, const char *name) {
 184         return dm_simplecmd(task, name, 0);
 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 (ro)
 208                 dm_task_set_ro(dmt);
 209
 210         if (uuid){
 211                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
 212                 if (!prefixed_uuid) {
 213                         condlog(0, "cannot create prefixed uuid : %s\n",
 214                                 strerror(errno));
 215                         goto addout;
 216                 }
 217                 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
 218                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 219                         goto freeout;
 220         }
 221
 222         dm_task_no_open_count(dmt);
 223
 224         r = dm_task_run (dmt);
 225
 226         freeout:
 227         if (prefixed_uuid)
 228                 FREE(prefixed_uuid);
 229
 230         addout:
 231         dm_task_destroy (dmt);
 232
 233         return r;
 234 }
 235
 236 static int
 237 _dm_addmap_create (const char *name, const char *params,
 238                   unsigned long long size, const char *uuid, int ro) {
 239         int r;
 240         r = dm_addmap(DM_DEVICE_CREATE, name, TGT_MPATH, params, size, uuid,
 241                       ro);
 242         /*
 243          * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
 244          * Failing the second part leaves an empty map. Clean it up.
 245          */
 246         if (!r && dm_map_present(name)) {
 247                 condlog(3, "%s: failed to load map (a path might be in use)",
 248                         name);
 249                 dm_flush_map(name);
 250         }
 251         return r;
 252 }
 253
 254 #define ADDMAP_RW 0
 255 #define ADDMAP_RO 1
 256
 257 extern int
 258 dm_addmap_create (const char *name, const char *params,
 259                   unsigned long long size, const char *uuid) {
 260         return _dm_addmap_create(name, params, size, uuid, ADDMAP_RW);
 261 }
 262
 263 extern int
 264 dm_addmap_create_ro (const char *name, const char *params,
 265                   unsigned long long size, const char *uuid) {
 266         return _dm_addmap_create(name, params, size, uuid, ADDMAP_RO);
 267 }
 268
 269 extern int
 270 dm_addmap_reload (const char *name, const char *params,
 271                   unsigned long long size, const char *uuid) {
 272         return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
 273                          ADDMAP_RW);
 274 }
 275
 276 extern int
 277 dm_addmap_reload_ro (const char *name, const char *params,
 278                      unsigned long long size, const char *uuid) {
 279         return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
 280                          ADDMAP_RO);
 281 }
 282
 283 extern int
 284 dm_map_present (const char * str)
 285 {
 286         int r = 0;
 287         struct dm_task *dmt;
 288         struct dm_info info;
 289
 290         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 291                 return 0;
 292
 293         if (!dm_task_set_name(dmt, str))
 294                 goto out;
 295
 296         dm_task_no_open_count(dmt);
 297
 298         if (!dm_task_run(dmt))
 299                 goto out;
 300
 301         if (!dm_task_get_info(dmt, &info))
 302                 goto out;
 303
 304         if (info.exists)
 305                 r = 1;
 306 out:
 307         dm_task_destroy(dmt);
 308         return r;
 309 }
 310
 311 extern int
 312 dm_get_map(char * name, unsigned long long * size, char * outparams)
 313 {
 314         int r = 1;
 315         struct dm_task *dmt;
 316         void *next = NULL;
 317         uint64_t start, length;
 318         char *target_type = NULL;
 319         char *params = NULL;
 320
 321         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 322                 return 1;
 323
 324         if (!dm_task_set_name(dmt, name))
 325                 goto out;
 326
 327         dm_task_no_open_count(dmt);
 328
 329         if (!dm_task_run(dmt))
 330                 goto out;
 331
 332         /* Fetch 1st target */
 333         next = dm_get_next_target(dmt, next, &start, &length,
 334                                   &target_type, &params);
 335
 336         if (size)
 337                 *size = length;
 338
 339         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 340                 r = 0;
 341 out:
 342         dm_task_destroy(dmt);
 343         return r;
 344 }
 345
 346 extern int
 347 dm_get_uuid(char *name, char *uuid)
 348 {
 349         struct dm_task *dmt;
 350         const char *uuidtmp;
 351         int r = 1;
 352
 353         dmt = dm_task_create(DM_DEVICE_INFO);
 354         if (!dmt)
 355                 return 1;
 356
 357         if (!dm_task_set_name (dmt, name))
 358                 goto uuidout;
 359
 360         if (!dm_task_run(dmt))
 361                 goto uuidout;
 362
 363         uuidtmp = dm_task_get_uuid(dmt);
 364         if (uuidtmp) {
 365                 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 366                         strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 367                 else
 368                         strcpy(uuid, uuidtmp);
 369         }
 370         else
 371                 uuid[0] = '\0';
 372
 373         r = 0;
 374 uuidout:
 375         dm_task_destroy(dmt);
 376         return r;
 377 }
 378
 379 extern int
 380 dm_get_status(char * name, char * outstatus)
 381 {
 382         int r = 1;
 383         struct dm_task *dmt;
 384         void *next = NULL;
 385         uint64_t start, length;
 386         char *target_type;
 387         char *status;
 388
 389         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 390                 return 1;
 391
 392         if (!dm_task_set_name(dmt, name))
 393                 goto out;
 394
 395         dm_task_no_open_count(dmt);
 396
 397         if (!dm_task_run(dmt))
 398                 goto out;
 399
 400         /* Fetch 1st target */
 401         next = dm_get_next_target(dmt, next, &start, &length,
 402                                   &target_type, &status);
 403
 404         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 405                 r = 0;
 406 out:
 407         if (r)
 408                 condlog(0, "%s: error getting map status string", name);
 409
 410         dm_task_destroy(dmt);
 411         return r;
 412 }
 413
 414 /*
 415  * returns:
 416  *    1 : match
 417  *    0 : no match
 418  *   -1 : empty map
 419  */
 420 extern int
 421 dm_type(const char * name, char * type)
 422 {
 423         int r = 0;
 424         struct dm_task *dmt;
 425         void *next = NULL;
 426         uint64_t start, length;
 427         char *target_type = NULL;
 428         char *params;
 429
 430         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 431                 return 0;
 432
 433         if (!dm_task_set_name(dmt, name))
 434                 goto out;
 435
 436         dm_task_no_open_count(dmt);
 437
 438         if (!dm_task_run(dmt))
 439                 goto out;
 440
 441         /* Fetch 1st target */
 442         next = dm_get_next_target(dmt, next, &start, &length,
 443                                   &target_type, &params);
 444
 445         if (!target_type)
 446                 r = -1;
 447         else if (!strcmp(target_type, type))
 448                 r = 1;
 449
 450 out:
 451         dm_task_destroy(dmt);
 452         return r;
 453 }
 454
 455 static int
 456 dm_dev_t (const char * mapname, char * dev_t, int len)
 457 {
 458         int r = 1;
 459         struct dm_task *dmt;
 460         struct dm_info info;
 461
 462         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 463                 return 0;
 464
 465         if (!dm_task_set_name(dmt, mapname))
 466                 goto out;
 467
 468         if (!dm_task_run(dmt))
 469                 goto out;
 470
 471         if (!dm_task_get_info(dmt, &info))
 472                 goto out;
 473
 474         r = info.open_count;
 475         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 476                     goto out;
 477
 478         r = 0;
 479 out:
 480         dm_task_destroy(dmt);
 481         return r;
 482 }
 483
 484 int
 485 dm_get_opencount (const char * mapname)
 486 {
 487         int r = -1;
 488         struct dm_task *dmt;
 489         struct dm_info info;
 490
 491         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 492                 return 0;
 493
 494         if (!dm_task_set_name(dmt, mapname))
 495                 goto out;
 496
 497         if (!dm_task_run(dmt))
 498                 goto out;
 499
 500         if (!dm_task_get_info(dmt, &info))
 501                 goto out;
 502
 503         r = info.open_count;
 504 out:
 505         dm_task_destroy(dmt);
 506         return r;
 507 }
 508
 509 int
 510 dm_get_minor (char * mapname)
 511 {
 512         int r = -1;
 513         struct dm_task *dmt;
 514         struct dm_info info;
 515
 516         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 517                 return 0;
 518
 519         if (!dm_task_set_name(dmt, mapname))
 520                 goto out;
 521
 522         if (!dm_task_run(dmt))
 523                 goto out;
 524
 525         if (!dm_task_get_info(dmt, &info))
 526                 goto out;
 527
 528         r = info.minor;
 529 out:
 530         dm_task_destroy(dmt);
 531         return r;
 532 }
 533
 534 extern int
 535 dm_flush_map (const char * mapname)
 536 {
 537         int r;
 538
 539         if (!dm_map_present(mapname))
 540                 return 0;
 541
 542         if (dm_type(mapname, TGT_MPATH) <= 0)
 543                 return 0; /* nothing to do */
 544
 545         if (dm_remove_partmaps(mapname))
 546                 return 1;
 547
 548         if (dm_get_opencount(mapname)) {
 549                 condlog(2, "%s: map in use", mapname);
 550                 return 1;
 551         }
 552
 553         r = dm_simplecmd_noflush(DM_DEVICE_REMOVE, mapname);
 554
 555         if (r) {
 556                 condlog(4, "multipath map %s removed", mapname);
 557                 return 0;
 558         }
 559         return 1;
 560 }
 561
 562 extern int
 563 dm_flush_maps (void)
 564 {
 565         int r = 0;
 566         struct dm_task *dmt;
 567         struct dm_names *names;
 568         unsigned next = 0;
 569
 570         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 571                 return 0;
 572
 573         dm_task_no_open_count(dmt);
 574
 575         if (!dm_task_run (dmt))
 576                 goto out;
 577
 578         if (!(names = dm_task_get_names (dmt)))
 579                 goto out;
 580
 581         if (!names->dev)
 582                 goto out;
 583
 584         do {
 585                 r |= dm_flush_map(names->name);
 586                 next = names->next;
 587                 names = (void *) names + next;
 588         } while (next);
 589
 590         out:
 591         dm_task_destroy (dmt);
 592         return r;
 593 }
 594
 595 int
 596 dm_message(char * mapname, char * message)
 597 {
 598         int r = 1;
 599         struct dm_task *dmt;
 600
 601         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 602                 return 1;
 603
 604         if (!dm_task_set_name(dmt, mapname))
 605                 goto out;
 606
 607         if (!dm_task_set_sector(dmt, 0))
 608                 goto out;
 609
 610         if (!dm_task_set_message(dmt, message))
 611                 goto out;
 612
 613         dm_task_no_open_count(dmt);
 614
 615         if (!dm_task_run(dmt))
 616                 goto out;
 617
 618         r = 0;
 619 out:
 620         if (r)
 621                 condlog(0, "DM message failed [%s]", message);
 622
 623         dm_task_destroy(dmt);
 624         return r;
 625 }
 626
 627 int
 628 dm_fail_path(char * mapname, char * path)
 629 {
 630         char message[32];
 631
 632         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 633                 return 1;
 634
 635         return dm_message(mapname, message);
 636 }
 637
 638 int
 639 dm_reinstate_path(char * mapname, char * path)
 640 {
 641         char message[32];
 642
 643         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 644                 return 1;
 645
 646         return dm_message(mapname, message);
 647 }
 648
 649 int
 650 dm_queue_if_no_path(char *mapname, int enable)
 651 {
 652         char *message;
 653
 654         if (enable)
 655                 message = "queue_if_no_path\n";
 656         else
 657                 message = "fail_if_no_path\n";
 658
 659         return dm_message(mapname, message);
 660 }
 661
 662 int
 663 dm_set_pg_timeout(char *mapname, int timeout_val)
 664 {
 665         char message[24];
 666
 667         if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
 668                 return 1;
 669         return dm_message(mapname, message);
 670 }
 671
 672 static int
 673 dm_groupmsg (char * msg, char * mapname, int index)
 674 {
 675         char message[32];
 676
 677         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 678                 return 1;
 679
 680         return dm_message(mapname, message);
 681 }
 682
 683 int
 684 dm_switchgroup(char * mapname, int index)
 685 {
 686         return dm_groupmsg("switch", mapname, index);
 687 }
 688
 689 int
 690 dm_enablegroup(char * mapname, int index)
 691 {
 692         return dm_groupmsg("enable", mapname, index);
 693 }
 694
 695 int
 696 dm_disablegroup(char * mapname, int index)
 697 {
 698         return dm_groupmsg("disable", mapname, index);
 699 }
 700
 701 int
 702 dm_get_maps (vector mp)
 703 {
 704         struct multipath * mpp;
 705         int r = 1;
 706         int info;
 707         struct dm_task *dmt;
 708         struct dm_names *names;
 709         unsigned next = 0;
 710
 711         if (!mp)
 712                 return 1;
 713
 714         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 715                 return 1;
 716
 717         dm_task_no_open_count(dmt);
 718
 719         if (!dm_task_run(dmt))
 720                 goto out;
 721
 722         if (!(names = dm_task_get_names(dmt)))
 723                 goto out;
 724
 725         if (!names->dev) {
 726                 r = 0; /* this is perfectly valid */
 727                 goto out;
 728         }
 729
 730         do {
 731                 info = dm_type(names->name, TGT_MPATH);
 732
 733                 if (info <= 0)
 734                         goto next;
 735
 736                 mpp = alloc_multipath();
 737
 738                 if (!mpp)
 739                         goto out;
 740
 741                 mpp->alias = STRDUP(names->name);
 742
 743                 if (!mpp->alias)
 744                         goto out1;
 745
 746                 if (info > 0) {
 747                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 748                                 goto out1;
 749
 750                         if (dm_get_status(names->name, mpp->status))
 751                                 goto out1;
 752
 753                         dm_get_uuid(names->name, mpp->wwid);
 754                         dm_get_info(names->name, &mpp->dmi);
 755                 }
 756
 757                 if (!vector_alloc_slot(mp))
 758                         goto out1;
 759
 760                 vector_set_slot(mp, mpp);
 761                 mpp = NULL;
 762 next:
 763                 next = names->next;
 764                 names = (void *) names + next;
 765         } while (next);
 766
 767         r = 0;
 768         goto out;
 769 out1:
 770         free_multipath(mpp, KEEP_PATHS);
 771 out:
 772         dm_task_destroy (dmt);
 773         return r;
 774 }
 775
 776 extern int
 777 dm_get_name(char *uuid, char *name)
 778 {
 779         vector vec;
 780         struct multipath *mpp;
 781         int i, rc = 0;
 782
 783         vec = vector_alloc();
 784
 785         if (!vec)
 786                 return 0;
 787
 788         if (dm_get_maps(vec)) {
 789                 goto out;
 790         }
 791
 792         vector_foreach_slot(vec, mpp, i) {
 793                 if (!strcmp(uuid, mpp->wwid)) {
 794                         strcpy(name, mpp->alias);
 795                         rc=1;
 796                         break;
 797                 }
 798         }
 799 out:
 800         vector_foreach_slot(vec, mpp, i) {
 801                 free_multipath(mpp, KEEP_PATHS);
 802         }
 803         vector_free(vec);
 804         return rc;
 805 }
 806
 807 int
 808 dm_geteventnr (char *name)
 809 {
 810         struct dm_task *dmt;
 811         struct dm_info info;
 812
 813         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 814                 return 0;
 815
 816         if (!dm_task_set_name(dmt, name))
 817                 goto out;
 818
 819         dm_task_no_open_count(dmt);
 820
 821         if (!dm_task_run(dmt))
 822                 goto out;
 823
 824         if (!dm_task_get_info(dmt, &info)) {
 825                 info.event_nr = 0;
 826                 goto out;
 827         }
 828
 829         if (!info.exists) {
 830                 info.event_nr = 0;
 831                 goto out;
 832         }
 833
 834 out:
 835         dm_task_destroy(dmt);
 836
 837         return info.event_nr;
 838 }
 839
 840 char *
 841 dm_mapname(int major, int minor)
 842 {
 843         char * response = NULL;
 844         const char *map;
 845         struct dm_task *dmt;
 846         int r;
 847         int loop = MAX_WAIT * LOOPS_PER_SEC;
 848
 849         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 850                 return NULL;
 851
 852         if (!dm_task_set_major(dmt, major) ||
 853             !dm_task_set_minor(dmt, minor))
 854                 goto bad;
 855
 856         dm_task_no_open_count(dmt);
 857
 858         /*
 859          * device map might not be ready when we get here from
 860          * daemon uev_trigger -> uev_add_map
 861          */
 862         while (--loop) {
 863                 r = dm_task_run(dmt);
 864
 865                 if (r)
 866                         break;
 867
 868                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 869         }
 870
 871         if (!r) {
 872                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 873                 goto bad;
 874         }
 875
 876         map = dm_task_get_name(dmt);
 877         if (map && strlen(map))
 878                 response = STRDUP((char *)dm_task_get_name(dmt));
 879
 880         dm_task_destroy(dmt);
 881         return response;
 882 bad:
 883         dm_task_destroy(dmt);
 884         condlog(0, "%i:%i: error fetching map name", major, minor);
 885         return NULL;
 886 }
 887
 888 int
 889 dm_remove_partmaps (const char * mapname)
 890 {
 891         struct dm_task *dmt;
 892         struct dm_names *names;
 893         unsigned next = 0;
 894         char params[PARAMS_SIZE];
 895         unsigned long long size;
 896         char dev_t[32];
 897         int r = 1;
 898
 899         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 900                 return 1;
 901
 902         dm_task_no_open_count(dmt);
 903
 904         if (!dm_task_run(dmt))
 905                 goto out;
 906
 907         if (!(names = dm_task_get_names(dmt)))
 908                 goto out;
 909
 910         if (!names->dev) {
 911                 r = 0; /* this is perfectly valid */
 912                 goto out;
 913         }
 914
 915         if (dm_dev_t(mapname, &dev_t[0], 32))
 916                 goto out;
 917
 918         do {
 919                 if (
 920                     /*
 921                      * if devmap target is "linear"
 922                      */
 923                     (dm_type(names->name, TGT_PART) > 0) &&
 924
 925                     /*
 926                      * and the multipath mapname and the part mapname start
 927                      * the same
 928                      */
 929                     !strncmp(names->name, mapname, strlen(mapname)) &&
 930
 931                     /*
 932                      * and the opencount is 0 for us to allow removal
 933                      */
 934                     !dm_get_opencount(names->name) &&
 935
 936                     /*
 937                      * and we can fetch the map table from the kernel
 938                      */
 939                     !dm_get_map(names->name, &size, &params[0]) &&
 940
 941                     /*
 942                      * and the table maps over the multipath map
 943                      */
 944                     strstr(params, dev_t)
 945                    ) {
 946                                 /*
 947                                  * then it's a kpartx generated partition.
 948                                  * remove it.
 949                                  */
 950                                 condlog(4, "partition map %s removed",
 951                                         names->name);
 952                                 dm_simplecmd_noflush(DM_DEVICE_REMOVE, names->name);
 953                    }
 954
 955                 next = names->next;
 956                 names = (void *) names + next;
 957         } while (next);
 958
 959         r = 0;
 960 out:
 961         dm_task_destroy (dmt);
 962         return r;
 963 }
 964
 965 static struct dm_info *
 966 alloc_dminfo (void)
 967 {
 968         return MALLOC(sizeof(struct dm_info));
 969 }
 970
 971 int
 972 dm_get_info (char * mapname, struct dm_info ** dmi)
 973 {
 974         int r = 1;
 975         struct dm_task *dmt = NULL;
 976
 977         if (!mapname)
 978                 return 1;
 979
 980         if (!*dmi)
 981                 *dmi = alloc_dminfo();
 982
 983         if (!*dmi)
 984                 return 1;
 985
 986         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 987                 goto out;
 988
 989         if (!dm_task_set_name(dmt, mapname))
 990                 goto out;
 991
 992         dm_task_no_open_count(dmt);
 993
 994         if (!dm_task_run(dmt))
 995                 goto out;
 996
 997         if (!dm_task_get_info(dmt, *dmi))
 998                 goto out;
 999
1000         r = 0;
1001 out:
1002         if (r)
1003                 memset(*dmi, 0, sizeof(struct dm_info));
1004
1005         if (dmt)
1006                 dm_task_destroy(dmt);
1007
1008         return r;
1009 }
1010
1011 int
1012 dm_rename_partmaps (char * old, char * new)
1013 {
1014         struct dm_task *dmt;
1015         struct dm_names *names;
1016         unsigned next = 0;
1017         char buff[PARAMS_SIZE];
1018         unsigned long long size;
1019         char dev_t[32];
1020         int r = 1;
1021
1022         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1023                 return 1;
1024
1025         dm_task_no_open_count(dmt);
1026
1027         if (!dm_task_run(dmt))
1028                 goto out;
1029
1030         if (!(names = dm_task_get_names(dmt)))
1031                 goto out;
1032
1033         if (!names->dev) {
1034                 r = 0; /* this is perfectly valid */
1035                 goto out;
1036         }
1037
1038         if (dm_dev_t(old, &dev_t[0], 32))
1039                 goto out;
1040
1041         do {
1042                 if (
1043                     /*
1044                      * if devmap target is "linear"
1045                      */
1046                     (dm_type(names->name, TGT_PART) > 0) &&
1047
1048                     /*
1049                      * and the multipath mapname and the part mapname start
1050                      * the same
1051                      */
1052                     !strncmp(names->name, old, strlen(old)) &&
1053
1054                     /*
1055                      * and we can fetch the map table from the kernel
1056                      */
1057                     !dm_get_map(names->name, &size, &buff[0]) &&
1058
1059                     /*
1060                      * and the table maps over the multipath map
1061                      */
1062                     strstr(buff, dev_t)
1063                    ) {
1064                                 /*
1065                                  * then it's a kpartx generated partition.
1066                                  * Rename it.
1067                                  */
1068                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1069                                          new, names->name + strlen(old));
1070                                 dm_rename(names->name, buff);
1071                                 condlog(4, "partition map %s renamed",
1072                                         names->name);
1073                    }
1074
1075                 next = names->next;
1076                 names = (void *) names + next;
1077         } while (next);
1078
1079         r = 0;
1080 out:
1081         dm_task_destroy (dmt);
1082         return r;
1083 }
1084
1085 int
1086 dm_rename (char * old, char * new)
1087 {
1088         int r = 0;
1089         struct dm_task *dmt;
1090
1091         if (dm_rename_partmaps(old, new))
1092                 return r;
1093
1094         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1095                 return r;
1096
1097         if (!dm_task_set_name(dmt, old))
1098                 goto out;
1099
1100         if (!dm_task_set_newname(dmt, new))
1101                 goto out;
1102
1103         dm_task_no_open_count(dmt);
1104
1105         if (!dm_task_run(dmt))
1106                 goto out;
1107
1108         r = 1;
1109 out:
1110         dm_task_destroy(dmt);
1111         return r;
1112 }