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_message(char * mapname, char * message)
 469 {
 470         int r = 1;
 471         struct dm_task *dmt;
 472
 473         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 474                 return 1;
 475
 476         if (!dm_task_set_name(dmt, mapname))
 477                 goto out;
 478
 479         if (!dm_task_set_sector(dmt, 0))
 480                 goto out;
 481
 482         if (!dm_task_set_message(dmt, message))
 483                 goto out;
 484
 485         dm_task_no_open_count(dmt);
 486
 487         if (!dm_task_run(dmt))
 488                 goto out;
 489
 490         r = 0;
 491 out:
 492         if (r)
 493                 condlog(0, "DM message failed [%s]", message);
 494
 495         dm_task_destroy(dmt);
 496         return r;
 497 }
 498
 499 int
 500 dm_fail_path(char * mapname, char * path)
 501 {
 502         char message[32];
 503
 504         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 505                 return 1;
 506
 507         return dm_message(mapname, message);
 508 }
 509
 510 int
 511 dm_reinstate_path(char * mapname, char * path)
 512 {
 513         char message[32];
 514
 515         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 516                 return 1;
 517
 518         return dm_message(mapname, message);
 519 }
 520
 521 int
 522 dm_queue_if_no_path(char *mapname, int enable)
 523 {
 524         char *message;
 525
 526         if (enable)
 527                 message = "queue_if_no_path\n";
 528         else
 529                 message = "fail_if_no_path\n";
 530
 531         return dm_message(mapname, message);
 532 }
 533
 534 static int
 535 dm_groupmsg (char * msg, char * mapname, int index)
 536 {
 537         char message[32];
 538
 539         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 540                 return 1;
 541
 542         return dm_message(mapname, message);
 543 }
 544
 545 int
 546 dm_switchgroup(char * mapname, int index)
 547 {
 548         return dm_groupmsg("switch", mapname, index);
 549 }
 550
 551 int
 552 dm_enablegroup(char * mapname, int index)
 553 {
 554         return dm_groupmsg("enable", mapname, index);
 555 }
 556
 557 int
 558 dm_disablegroup(char * mapname, int index)
 559 {
 560         return dm_groupmsg("disable", mapname, index);
 561 }
 562
 563 int
 564 dm_get_maps (vector mp, char * type)
 565 {
 566         struct multipath * mpp;
 567         int r = 1;
 568         int info;
 569         struct dm_task *dmt;
 570         struct dm_names *names;
 571         unsigned next = 0;
 572
 573         if (!type || !mp)
 574                 return 1;
 575
 576         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 577                 return 1;
 578
 579         dm_task_no_open_count(dmt);
 580
 581         if (!dm_task_run(dmt))
 582                 goto out;
 583
 584         if (!(names = dm_task_get_names(dmt)))
 585                 goto out;
 586
 587         if (!names->dev) {
 588                 r = 0; /* this is perfectly valid */
 589                 goto out;
 590         }
 591
 592         do {
 593                 info = dm_type(names->name, type);
 594
 595                 if (!info)
 596                         goto next;
 597
 598                 mpp = alloc_multipath();
 599
 600                 if (!mpp)
 601                         goto out;
 602
 603                 mpp->alias = STRDUP(names->name);
 604
 605                 if (!mpp->alias)
 606                         goto out1;
 607
 608                 if (info > 0) {
 609                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 610                                 goto out1;
 611
 612                         if (dm_get_status(names->name, mpp->status))
 613                                 goto out1;
 614
 615                         dm_get_uuid(names->name, mpp->wwid);
 616                         dm_get_state(names->name, &mpp->dmstate);
 617                 }
 618
 619                 if (!vector_alloc_slot(mp))
 620                         goto out1;
 621
 622                 vector_set_slot(mp, mpp);
 623                 mpp = NULL;
 624 next:
 625                 next = names->next;
 626                 names = (void *) names + next;
 627         } while (next);
 628
 629         r = 0;
 630         goto out;
 631 out1:
 632         free_multipath(mpp, KEEP_PATHS);
 633 out:
 634         dm_task_destroy (dmt);
 635         return r;
 636 }
 637
 638 int
 639 dm_geteventnr (char *name)
 640 {
 641         struct dm_task *dmt;
 642         struct dm_info info;
 643
 644         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 645                 return 0;
 646
 647         if (!dm_task_set_name(dmt, name))
 648                 goto out;
 649
 650         dm_task_no_open_count(dmt);
 651
 652         if (!dm_task_run(dmt))
 653                 goto out;
 654
 655         if (!dm_task_get_info(dmt, &info)) {
 656                 info.event_nr = 0;
 657                 goto out;
 658         }
 659
 660         if (!info.exists) {
 661                 info.event_nr = 0;
 662                 goto out;
 663         }
 664
 665 out:
 666         dm_task_destroy(dmt);
 667
 668         return info.event_nr;
 669 }
 670
 671 char *
 672 dm_mapname(int major, int minor)
 673 {
 674         char * response;
 675         struct dm_task *dmt;
 676         int r;
 677         int loop = MAX_WAIT * LOOPS_PER_SEC;
 678
 679         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 680                 return NULL;
 681
 682         if (!dm_task_set_major(dmt, major) ||
 683             !dm_task_set_minor(dmt, minor))
 684                 goto bad;
 685
 686         dm_task_no_open_count(dmt);
 687
 688         /*
 689          * device map might not be ready when we get here from
 690          * daemon uev_trigger -> uev_add_map
 691          */
 692         while (--loop) {
 693                 dm_shut_log();
 694                 r = dm_task_run(dmt);
 695                 dm_restore_log();
 696
 697                 if (r)
 698                         break;
 699
 700                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 701         }
 702
 703         if (!r) {
 704                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 705                 goto bad;
 706         }
 707
 708         response = STRDUP((char *)dm_task_get_name(dmt));
 709         dm_task_destroy(dmt);
 710         return response;
 711 bad:
 712         dm_task_destroy(dmt);
 713         condlog(0, "%i:%i: error fetching map name", major, minor);
 714         return NULL;
 715 }
 716
 717 int
 718 dm_remove_partmaps (char * mapname)
 719 {
 720         struct dm_task *dmt;
 721         struct dm_names *names;
 722         unsigned next = 0;
 723         char params[PARAMS_SIZE];
 724         unsigned long long size;
 725         char dev_t[32];
 726         int r = 1;
 727
 728         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 729                 return 1;
 730
 731         dm_task_no_open_count(dmt);
 732
 733         if (!dm_task_run(dmt))
 734                 goto out;
 735
 736         if (!(names = dm_task_get_names(dmt)))
 737                 goto out;
 738
 739         if (!names->dev) {
 740                 r = 0; /* this is perfectly valid */
 741                 goto out;
 742         }
 743
 744         if (dm_dev_t(mapname, &dev_t[0], 32))
 745                 goto out;
 746
 747         do {
 748                 if (
 749                     /*
 750                      * if devmap target is "linear"
 751                      */
 752                     dm_type(names->name, "linear") &&
 753
 754                     /*
 755                      * and the multipath mapname and the part mapname start
 756                      * the same
 757                      */
 758                     !strncmp(names->name, mapname, strlen(mapname)) &&
 759
 760                     /*
 761                      * and the opencount is 0 for us to allow removal
 762                      */
 763                     !dm_get_opencount(names->name) &&
 764
 765                     /*
 766                      * and we can fetch the map table from the kernel
 767                      */
 768                     !dm_get_map(names->name, &size, &params[0]) &&
 769
 770                     /*
 771                      * and the table maps over the multipath map
 772                      */
 773                     strstr(params, dev_t)
 774                    ) {
 775                                 /*
 776                                  * then it's a kpartx generated partition.
 777                                  * remove it.
 778                                  */
 779                                 condlog(4, "partition map %s removed",
 780                                         names->name);
 781                                 dm_simplecmd(DM_DEVICE_REMOVE, names->name);
 782                    }
 783
 784                 next = names->next;
 785                 names = (void *) names + next;
 786         } while (next);
 787
 788         r = 0;
 789 out:
 790         dm_task_destroy (dmt);
 791         return r;
 792 }
 793
 794 #if 0
 795 int
 796 dm_rename (char * old, char * new)
 797 {
 798         int r = 1;
 799         struct dm_task *dmt;
 800
 801         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
 802                 return 0;
 803
 804         if (!dm_task_set_name(dmt, old))
 805                 goto out;
 806
 807         if (!dm_task_set_newname(dmt, new))
 808                 goto out;
 809
 810         dm_task_no_open_count(dmt);
 811
 812         if (!dm_task_run(dmt))
 813                 goto out;
 814
 815         r = 0;
 816 out:
 817         dm_task_destroy(dmt);
 818         return r;
 819 }
 820 #endif