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