libmultipath/devmapper.c

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