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 static void
  25 dm_restore_log (void)
  26 {
  27         dm_log_init(NULL);
  28 }
  29
  30 static 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_status(char * name, char * outstatus)
 223 {
 224         int r = 1;
 225         struct dm_task *dmt;
 226         void *next = NULL;
 227         uint64_t start, length;
 228         char *target_type;
 229         char *status;
 230
 231         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 232                 return 1;
 233
 234         if (!dm_task_set_name(dmt, name))
 235                 goto out;
 236
 237         dm_task_no_open_count(dmt);
 238
 239         if (!dm_task_run(dmt))
 240                 goto out;
 241
 242         /* Fetch 1st target */
 243         next = dm_get_next_target(dmt, next, &start, &length,
 244                                   &target_type, &status);
 245
 246         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 247                 r = 0;
 248 out:
 249         if (r)
 250                 condlog(0, "%s: error getting map status string", name);
 251
 252         dm_task_destroy(dmt);
 253         return r;
 254 }
 255
 256 extern int
 257 dm_type(char * name, char * type)
 258 {
 259         int r = 0;
 260         struct dm_task *dmt;
 261         void *next = NULL;
 262         uint64_t start, length;
 263         char *target_type = NULL;
 264         char *params;
 265
 266         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 267                 return 0;
 268
 269         if (!dm_task_set_name(dmt, name))
 270                 goto out;
 271
 272         dm_task_no_open_count(dmt);
 273
 274         if (!dm_task_run(dmt))
 275                 goto out;
 276
 277         /* Fetch 1st target */
 278         next = dm_get_next_target(dmt, next, &start, &length,
 279                                   &target_type, &params);
 280
 281         if (0 == strcmp(target_type, type))
 282                 r = 1;
 283
 284 out:
 285         dm_task_destroy(dmt);
 286         return r;
 287 }
 288
 289 static int
 290 dm_dev_t (char * mapname, char * dev_t, int len)
 291 {
 292         int r = 1;
 293         struct dm_task *dmt;
 294         struct dm_info info;
 295
 296         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 297                 return 0;
 298
 299         if (!dm_task_set_name(dmt, mapname))
 300                 goto out;
 301
 302         if (!dm_task_run(dmt))
 303                 goto out;
 304
 305         if (!dm_task_get_info(dmt, &info))
 306                 goto out;
 307
 308         r = info.open_count;
 309         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 310                     goto out;
 311
 312         r = 0;
 313 out:
 314         dm_task_destroy(dmt);
 315         return r;
 316 }
 317
 318 int
 319 dm_get_opencount (char * mapname)
 320 {
 321         int r = -1;
 322         struct dm_task *dmt;
 323         struct dm_info info;
 324
 325         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 326                 return 0;
 327
 328         if (!dm_task_set_name(dmt, mapname))
 329                 goto out;
 330
 331         if (!dm_task_run(dmt))
 332                 goto out;
 333
 334         if (!dm_task_get_info(dmt, &info))
 335                 goto out;
 336
 337         r = info.open_count;
 338 out:
 339         dm_task_destroy(dmt);
 340         return r;
 341 }
 342
 343 int
 344 dm_get_minor (char * mapname)
 345 {
 346         int r = -1;
 347         struct dm_task *dmt;
 348         struct dm_info info;
 349
 350         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 351                 return 0;
 352
 353         if (!dm_task_set_name(dmt, mapname))
 354                 goto out;
 355
 356         if (!dm_task_run(dmt))
 357                 goto out;
 358
 359         if (!dm_task_get_info(dmt, &info))
 360                 goto out;
 361
 362         r = info.minor;
 363 out:
 364         dm_task_destroy(dmt);
 365         return r;
 366 }
 367
 368 extern int
 369 dm_flush_map (char * mapname, char * type)
 370 {
 371         int r;
 372
 373         if (!dm_map_present(mapname))
 374                 return 0;
 375
 376         if (!dm_type(mapname, type))
 377                 return 1;
 378
 379         if (dm_remove_partmaps(mapname))
 380                 return 1;
 381
 382         if (dm_get_opencount(mapname))
 383                 return 1;
 384
 385         r = dm_simplecmd(DM_DEVICE_REMOVE, mapname);
 386
 387         if (r) {
 388                 condlog(4, "multipath map %s removed", mapname);
 389                 return 0;
 390         }
 391         return 1;
 392 }
 393
 394 extern int
 395 dm_flush_maps (char * type)
 396 {
 397         int r = 0;
 398         struct dm_task *dmt;
 399         struct dm_names *names;
 400         unsigned next = 0;
 401
 402         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 403                 return 0;
 404
 405         dm_task_no_open_count(dmt);
 406
 407         if (!dm_task_run (dmt))
 408                 goto out;
 409
 410         if (!(names = dm_task_get_names (dmt)))
 411                 goto out;
 412
 413         if (!names->dev)
 414                 goto out;
 415
 416         do {
 417                 r += dm_flush_map(names->name, type);
 418                 next = names->next;
 419                 names = (void *) names + next;
 420         } while (next);
 421
 422         out:
 423         dm_task_destroy (dmt);
 424         return r;
 425 }
 426
 427 int
 428 dm_fail_path(char * mapname, char * path)
 429 {
 430         int r = 1;
 431         struct dm_task *dmt;
 432         char str[32];
 433
 434         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 435                 return 1;
 436
 437         if (!dm_task_set_name(dmt, mapname))
 438                 goto out;
 439
 440         if (!dm_task_set_sector(dmt, 0))
 441                 goto out;
 442
 443         if (snprintf(str, 32, "fail_path %s\n", path) > 32)
 444                 goto out;
 445
 446         if (!dm_task_set_message(dmt, str))
 447                 goto out;
 448
 449         dm_task_no_open_count(dmt);
 450
 451         if (!dm_task_run(dmt))
 452                 goto out;
 453
 454         r = 0;
 455 out:
 456         dm_task_destroy(dmt);
 457         return r;
 458 }
 459
 460 int
 461 dm_reinstate(char * mapname, char * path)
 462 {
 463         int r = 1;
 464         struct dm_task *dmt;
 465         char str[32];
 466
 467         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 468                 return 1;
 469
 470         if (!dm_task_set_name(dmt, mapname))
 471                 goto out;
 472
 473         if (!dm_task_set_sector(dmt, 0))
 474                 goto out;
 475
 476         if (snprintf(str, 32, "reinstate_path %s\n", path) > 32)
 477                 goto out;
 478
 479         if (!dm_task_set_message(dmt, str))
 480                 goto out;
 481
 482         dm_task_no_open_count(dmt);
 483
 484         if (!dm_task_run(dmt))
 485                 goto out;
 486
 487         r = 0;
 488 out:
 489         dm_task_destroy(dmt);
 490         return r;
 491 }
 492
 493 static int
 494 dm_groupmsg (char * msg, char * mapname, int index)
 495 {
 496         int r = 0;
 497         struct dm_task *dmt;
 498         char str[24];
 499
 500         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 501                 return 0;
 502
 503         if (!dm_task_set_name(dmt, mapname))
 504                 goto out;
 505
 506         if (!dm_task_set_sector(dmt, 0))
 507                 goto out;
 508
 509         snprintf(str, 24, "%s_group %i\n", msg, index);
 510
 511         if (!dm_task_set_message(dmt, str))
 512                 goto out;
 513
 514         dm_task_no_open_count(dmt);
 515
 516         if (!dm_task_run(dmt))
 517                 goto out;
 518
 519         condlog(3, "message %s 0 %s", mapname, str);
 520         r = 1;
 521
 522         out:
 523         if (!r)
 524                 condlog(3, "message %s 0 %s failed", mapname, str);
 525
 526         dm_task_destroy(dmt);
 527
 528         return r;
 529 }
 530
 531 int
 532 dm_switchgroup(char * mapname, int index)
 533 {
 534         return dm_groupmsg("switch", mapname,index);
 535 }
 536
 537 int
 538 dm_enablegroup(char * mapname, int index)
 539 {
 540         return dm_groupmsg("enable", mapname,index);
 541 }
 542
 543 int
 544 dm_disablegroup(char * mapname, int index)
 545 {
 546         return dm_groupmsg("disable", mapname,index);
 547 }
 548
 549 int
 550 dm_get_maps (vector mp, char * type)
 551 {
 552         struct multipath * mpp;
 553         int r = 1;
 554         struct dm_task *dmt;
 555         struct dm_names *names;
 556         unsigned next = 0;
 557
 558         if (!type || !mp)
 559                 return 1;
 560
 561         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 562                 return 1;
 563
 564         dm_task_no_open_count(dmt);
 565
 566         if (!dm_task_run(dmt))
 567                 goto out;
 568
 569         if (!(names = dm_task_get_names(dmt)))
 570                 goto out;
 571
 572         if (!names->dev) {
 573                 r = 0; /* this is perfectly valid */
 574                 goto out;
 575         }
 576
 577         do {
 578                 if (dm_type(names->name, type)) {
 579                         mpp = alloc_multipath();
 580
 581                         if (!mpp)
 582                                 goto out;
 583
 584                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 585                                 goto out1;
 586
 587                         if (dm_get_status(names->name, mpp->status))
 588                                 goto out1;
 589
 590                         dm_get_uuid(names->name, mpp->wwid);
 591
 592                         mpp->alias = MALLOC(strlen(names->name) + 1);
 593
 594                         if (!mpp->alias)
 595                                 goto out1;
 596
 597                         strncat(mpp->alias, names->name, strlen(names->name));
 598
 599                         if (!vector_alloc_slot(mp))
 600                                 goto out1;
 601
 602                         vector_set_slot(mp, mpp);
 603                         mpp = NULL;
 604                 }
 605                 next = names->next;
 606                 names = (void *) names + next;
 607         } while (next);
 608
 609         r = 0;
 610         goto out;
 611 out1:
 612         free_multipath(mpp, KEEP_PATHS);
 613 out:
 614         dm_task_destroy (dmt);
 615         return r;
 616 }
 617
 618 int
 619 dm_geteventnr (char *name)
 620 {
 621         struct dm_task *dmt;
 622         struct dm_info info;
 623
 624         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 625                 return 0;
 626
 627         if (!dm_task_set_name(dmt, name))
 628                 goto out;
 629
 630         dm_task_no_open_count(dmt);
 631
 632         if (!dm_task_run(dmt))
 633                 goto out;
 634
 635         if (!dm_task_get_info(dmt, &info)) {
 636                 info.event_nr = 0;
 637                 goto out;
 638         }
 639
 640         if (!info.exists) {
 641                 info.event_nr = 0;
 642                 goto out;
 643         }
 644
 645 out:
 646         dm_task_destroy(dmt);
 647
 648         return info.event_nr;
 649 }
 650
 651 char *
 652 dm_mapname(int major, int minor)
 653 {
 654         char * response;
 655         struct dm_task *dmt;
 656         int r;
 657         int loop = MAX_WAIT * LOOPS_PER_SEC;
 658
 659         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 660                 return NULL;
 661
 662         if (!dm_task_set_major(dmt, major) ||
 663             !dm_task_set_minor(dmt, minor))
 664                 goto bad;
 665
 666         dm_task_no_open_count(dmt);
 667
 668         /*
 669          * device map might not be ready when we get here from
 670          * daemon uev_trigger -> uev_add_map
 671          */
 672         while (--loop) {
 673                 dm_shut_log();
 674                 r = dm_task_run(dmt);
 675                 dm_restore_log();
 676
 677                 if (r)
 678                         break;
 679
 680                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 681         }
 682
 683         if (!r) {
 684                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 685                 goto bad;
 686         }
 687
 688         response = STRDUP((char *)dm_task_get_name(dmt));
 689         dm_task_destroy(dmt);
 690         return response;
 691 bad:
 692         dm_task_destroy(dmt);
 693         condlog(0, "%i:%i: error fetching map name", major, minor);
 694         return NULL;
 695 }
 696
 697 int
 698 dm_remove_partmaps (char * mapname)
 699 {
 700         struct dm_task *dmt;
 701         struct dm_names *names;
 702         unsigned next = 0;
 703         char params[PARAMS_SIZE];
 704         unsigned long long size;
 705         char dev_t[32];
 706         int r = 1;
 707
 708         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 709                 return 1;
 710
 711         dm_task_no_open_count(dmt);
 712
 713         if (!dm_task_run(dmt))
 714                 goto out;
 715
 716         if (!(names = dm_task_get_names(dmt)))
 717                 goto out;
 718
 719         if (!names->dev) {
 720                 r = 0; /* this is perfectly valid */
 721                 goto out;
 722         }
 723
 724         if (dm_dev_t(mapname, &dev_t[0], 32))
 725                 goto out;
 726
 727         do {
 728                 if (
 729                     /*
 730                      * if devmap target is "linear"
 731                      */
 732                     dm_type(names->name, "linear") &&
 733
 734                     /*
 735                      * and the multipath mapname and the part mapname start
 736                      * the same
 737                      */
 738                     !strncmp(names->name, mapname, strlen(mapname)) &&
 739
 740                     /*
 741                      * and the opencount is 0 for us to allow removal
 742                      */
 743                     !dm_get_opencount(names->name) &&
 744
 745                     /*
 746                      * and we can fetch the map table from the kernel
 747                      */
 748                     !dm_get_map(names->name, &size, &params[0]) &&
 749
 750                     /*
 751                      * and the table maps over the multipath map
 752                      */
 753                     strstr(params, dev_t)
 754                    ) {
 755                                 /*
 756                                  * then it's a kpartx generated partition.
 757                                  * remove it.
 758                                  */
 759                                 condlog(4, "partition map %s removed",
 760                                         names->name);
 761                                 dm_simplecmd(DM_DEVICE_REMOVE, names->name);
 762                    }
 763
 764                 next = names->next;
 765                 names = (void *) names + next;
 766         } while (next);
 767
 768         r = 0;
 769 out:
 770         dm_task_destroy (dmt);
 771         return r;
 772 }
 773
 774 #if 0
 775 int
 776 dm_rename (char * old, char * new)
 777 {
 778         int r = 1;
 779         struct dm_task *dmt;
 780
 781         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
 782                 return 0;
 783
 784         if (!dm_task_set_name(dmt, old))
 785                 goto out;
 786
 787         if (!dm_task_set_newname(dmt, new))
 788                 goto out;
 789
 790         dm_task_no_open_count(dmt);
 791
 792         if (!dm_task_run(dmt))
 793                 goto out;
 794
 795         r = 0;
 796 out:
 797         dm_task_destroy(dmt);
 798         return r;
 799 }
 800 #endif