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 <unistd.h>
  14 #include <errno.h>
  15
  16 #include "checkers.h"
  17 #include "vector.h"
  18 #include "structs.h"
  19 #include "debug.h"
  20 #include "memory.h"
  21 #include "devmapper.h"
  22 #include "config.h"
  23
  24 #include "log_pthread.h"
  25 #include <sys/types.h>
  26 #include <time.h>
  27
  28 #define MAX_WAIT 5
  29 #define LOOPS_PER_SEC 5
  30
  31 #define UUID_PREFIX "mpath-"
  32 #define UUID_PREFIX_LEN 6
  33
  34 static void
  35 dm_write_log (int level, const char *file, int line, const char *f, ...)
  36 {
  37         va_list ap;
  38         int thres;
  39
  40         if (level > 6)
  41                 level = 6;
  42
  43         thres = (conf) ? conf->verbosity : 0;
  44         if (thres <= 3 || level > thres)
  45                 return;
  46
  47         va_start(ap, f);
  48         if (!logsink) {
  49                 time_t t = time(NULL);
  50                 struct tm *tb = localtime(&t);
  51                 char buff[16];
  52
  53                 strftime(buff, sizeof(buff), "%b %d %H:%M:%S", tb);
  54                 buff[sizeof(buff)-1] = '\0';
  55
  56                 fprintf(stdout, "%s | ", buff);
  57                 fprintf(stdout, "libdevmapper: %s(%i): ", file, line);
  58                 vfprintf(stdout, f, ap);
  59                 fprintf(stdout, "\n");
  60         } else {
  61                 condlog(level, "libdevmapper: %s(%i): ", file, line);
  62                 log_safe(level + 3, f, ap);
  63         }
  64         va_end(ap);
  65
  66         return;
  67 }
  68
  69 extern void
  70 dm_init(void) {
  71         dm_log_init(&dm_write_log);
  72         dm_log_init_verbose(conf ? conf->verbosity + 3 : 0);
  73 }
  74
  75 static int
  76 dm_libprereq (void)
  77 {
  78         char version[64];
  79         int v[3];
  80         int minv[3] = {1, 2, 8};
  81
  82         dm_get_library_version(version, sizeof(version));
  83         condlog(3, "libdevmapper version %s", version);
  84         sscanf(version, "%d.%d.%d ", &v[0], &v[1], &v[2]);
  85
  86         if ((v[0] > minv[0]) ||
  87             ((v[0] ==  minv[0]) && (v[1] > minv[1])) ||
  88             ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2])))
  89                 return 0;
  90         condlog(0, "libdevmapper version must be >= %d.%.2d.%.2d",
  91                 minv[0], minv[1], minv[2]);
  92         return 1;
  93 }
  94
  95 static int
  96 dm_drvprereq (char * str)
  97 {
  98         int r = 2;
  99         struct dm_task *dmt;
 100         struct dm_versions *target;
 101         struct dm_versions *last_target;
 102         int minv[3] = {1, 0, 3};
 103         unsigned int *v;
 104
 105         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 106                 return 3;
 107
 108         dm_task_no_open_count(dmt);
 109
 110         if (!dm_task_run(dmt)) {
 111                 condlog(0, "Can not communicate with kernel DM");
 112                 goto out;
 113         }
 114         target = dm_task_get_versions(dmt);
 115
 116         do {
 117                 last_target = target;
 118                 if (!strncmp(str, target->name, strlen(str))) {
 119                         r = 1;
 120                         break;
 121                 }
 122                 target = (void *) target + target->next;
 123         } while (last_target != target);
 124
 125         if (r == 2) {
 126                 condlog(0, "DM multipath kernel driver not loaded");
 127                 goto out;
 128         }
 129         v = target->version;
 130         if ((v[0] > minv[0]) ||
 131             ((v[0] == minv[0]) && (v[1] > minv[1])) ||
 132             ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2]))) {
 133                 r = 0;
 134                 goto out;
 135         }
 136         condlog(0, "DM multipath kernel driver must be >= %u.%.2u.%.2u",
 137                 minv[0], minv[1], minv[2]);
 138 out:
 139         dm_task_destroy(dmt);
 140         return r;
 141 }
 142
 143 extern int
 144 dm_prereq (void)
 145 {
 146         if (dm_libprereq())
 147                 return 1;
 148         return dm_drvprereq(TGT_MPATH);
 149 }
 150
 151 static int
 152 dm_simplecmd (int task, const char *name, int no_flush) {
 153         int r = 0;
 154         struct dm_task *dmt;
 155
 156         if (!(dmt = dm_task_create (task)))
 157                 return 0;
 158
 159         if (!dm_task_set_name (dmt, name))
 160                 goto out;
 161
 162         dm_task_no_open_count(dmt);
 163         dm_task_skip_lockfs(dmt);       /* for DM_DEVICE_RESUME */
 164 #ifdef LIBDM_API_FLUSH
 165         if (no_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_simplecmd_flush (int task, const char *name) {
 178         return dm_simplecmd(task, name, 0);
 179 }
 180
 181 extern int
 182 dm_simplecmd_noflush (int task, const char *name) {
 183         return dm_simplecmd(task, name, 1);
 184 }
 185
 186 extern int
 187 dm_addmap (int task, const char *target, struct multipath *mpp, int use_uuid,
 188            int ro) {
 189         int r = 0;
 190         struct dm_task *dmt;
 191         char *prefixed_uuid = NULL;
 192
 193         if (!(dmt = dm_task_create (task)))
 194                 return 0;
 195
 196         if (!dm_task_set_name (dmt, mpp->alias))
 197                 goto addout;
 198
 199         if (!dm_task_add_target (dmt, 0, mpp->size, target, mpp->params))
 200                 goto addout;
 201
 202         if (ro)
 203                 dm_task_set_ro(dmt);
 204
 205         if (use_uuid && mpp->wwid){
 206                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(mpp->wwid) + 1);
 207                 if (!prefixed_uuid) {
 208                         condlog(0, "cannot create prefixed uuid : %s\n",
 209                                 strerror(errno));
 210                         goto addout;
 211                 }
 212                 sprintf(prefixed_uuid, UUID_PREFIX "%s", mpp->wwid);
 213                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 214                         goto freeout;
 215         }
 216
 217         if (mpp->attribute_flags & (1 << ATTR_MODE) &&
 218             !dm_task_set_mode(dmt, mpp->mode))
 219                 goto freeout;
 220         if (mpp->attribute_flags & (1 << ATTR_UID) &&
 221             !dm_task_set_uid(dmt, mpp->uid))
 222                 goto freeout;
 223         if (mpp->attribute_flags & (1 << ATTR_GID) &&
 224             !dm_task_set_gid(dmt, mpp->gid))
 225                 goto freeout;
 226
 227         dm_task_no_open_count(dmt);
 228
 229         r = dm_task_run (dmt);
 230
 231         freeout:
 232         if (prefixed_uuid)
 233                 FREE(prefixed_uuid);
 234
 235         addout:
 236         dm_task_destroy (dmt);
 237
 238         return r;
 239 }
 240
 241 static int
 242 _dm_addmap_create (struct multipath *mpp, int ro) {
 243         int r;
 244         r = dm_addmap(DM_DEVICE_CREATE, TGT_MPATH, mpp, 1, ro);
 245         /*
 246          * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
 247          * Failing the second part leaves an empty map. Clean it up.
 248          */
 249         if (!r && dm_map_present(mpp->alias)) {
 250                 condlog(3, "%s: failed to load map (a path might be in use)",
 251                         mpp->alias);
 252                 dm_flush_map(mpp->alias);
 253         }
 254         return r;
 255 }
 256
 257 #define ADDMAP_RW 0
 258 #define ADDMAP_RO 1
 259
 260 extern int
 261 dm_addmap_create (struct multipath *mpp) {
 262         return _dm_addmap_create(mpp, ADDMAP_RW);
 263 }
 264
 265 extern int
 266 dm_addmap_create_ro (struct multipath *mpp) {
 267         return _dm_addmap_create(mpp, ADDMAP_RO);
 268 }
 269
 270 extern int
 271 dm_addmap_reload (struct multipath *mpp) {
 272         return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, 0, ADDMAP_RW);
 273 }
 274
 275 extern int
 276 dm_addmap_reload_ro (struct multipath *mpp) {
 277         return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, 0, ADDMAP_RO);
 278 }
 279
 280 extern int
 281 dm_map_present (const char * str)
 282 {
 283         int r = 0;
 284         struct dm_task *dmt;
 285         struct dm_info info;
 286
 287         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 288                 return 0;
 289
 290         if (!dm_task_set_name(dmt, str))
 291                 goto out;
 292
 293         dm_task_no_open_count(dmt);
 294
 295         if (!dm_task_run(dmt))
 296                 goto out;
 297
 298         if (!dm_task_get_info(dmt, &info))
 299                 goto out;
 300
 301         if (info.exists)
 302                 r = 1;
 303 out:
 304         dm_task_destroy(dmt);
 305         return r;
 306 }
 307
 308 extern int
 309 dm_get_map(char * name, unsigned long long * size, char * outparams)
 310 {
 311         int r = 1;
 312         struct dm_task *dmt;
 313         void *next = NULL;
 314         uint64_t start, length;
 315         char *target_type = NULL;
 316         char *params = NULL;
 317
 318         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 319                 return 1;
 320
 321         if (!dm_task_set_name(dmt, name))
 322                 goto out;
 323
 324         dm_task_no_open_count(dmt);
 325
 326         if (!dm_task_run(dmt))
 327                 goto out;
 328
 329         /* Fetch 1st target */
 330         next = dm_get_next_target(dmt, next, &start, &length,
 331                                   &target_type, &params);
 332
 333         if (size)
 334                 *size = length;
 335
 336         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 337                 r = 0;
 338 out:
 339         dm_task_destroy(dmt);
 340         return r;
 341 }
 342
 343 extern int
 344 dm_get_uuid(char *name, char *uuid)
 345 {
 346         struct dm_task *dmt;
 347         const char *uuidtmp;
 348         int r = 1;
 349
 350         dmt = dm_task_create(DM_DEVICE_INFO);
 351         if (!dmt)
 352                 return 1;
 353
 354         if (!dm_task_set_name (dmt, name))
 355                 goto uuidout;
 356
 357         if (!dm_task_run(dmt))
 358                 goto uuidout;
 359
 360         uuidtmp = dm_task_get_uuid(dmt);
 361         if (uuidtmp) {
 362                 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 363                         strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 364                 else
 365                         strcpy(uuid, uuidtmp);
 366         }
 367         else
 368                 uuid[0] = '\0';
 369
 370         r = 0;
 371 uuidout:
 372         dm_task_destroy(dmt);
 373         return r;
 374 }
 375
 376 extern int
 377 dm_get_status(char * name, char * outstatus)
 378 {
 379         int r = 1;
 380         struct dm_task *dmt;
 381         void *next = NULL;
 382         uint64_t start, length;
 383         char *target_type;
 384         char *status;
 385
 386         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 387                 return 1;
 388
 389         if (!dm_task_set_name(dmt, name))
 390                 goto out;
 391
 392         dm_task_no_open_count(dmt);
 393
 394         if (!dm_task_run(dmt))
 395                 goto out;
 396
 397         /* Fetch 1st target */
 398         next = dm_get_next_target(dmt, next, &start, &length,
 399                                   &target_type, &status);
 400
 401         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 402                 r = 0;
 403 out:
 404         if (r)
 405                 condlog(0, "%s: error getting map status string", name);
 406
 407         dm_task_destroy(dmt);
 408         return r;
 409 }
 410
 411 /*
 412  * returns:
 413  *    1 : match
 414  *    0 : no match
 415  *   -1 : empty map
 416  */
 417 extern int
 418 dm_type(const char * name, char * type)
 419 {
 420         int r = 0;
 421         struct dm_task *dmt;
 422         void *next = NULL;
 423         uint64_t start, length;
 424         char *target_type = NULL;
 425         char *params;
 426
 427         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 428                 return 0;
 429
 430         if (!dm_task_set_name(dmt, name))
 431                 goto out;
 432
 433         dm_task_no_open_count(dmt);
 434
 435         if (!dm_task_run(dmt))
 436                 goto out;
 437
 438         /* Fetch 1st target */
 439         next = dm_get_next_target(dmt, next, &start, &length,
 440                                   &target_type, &params);
 441
 442         if (!target_type)
 443                 r = -1;
 444         else if (!strcmp(target_type, type))
 445                 r = 1;
 446
 447 out:
 448         dm_task_destroy(dmt);
 449         return r;
 450 }
 451
 452 static int
 453 dm_dev_t (const char * mapname, char * dev_t, int len)
 454 {
 455         int r = 1;
 456         struct dm_task *dmt;
 457         struct dm_info info;
 458
 459         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 460                 return 0;
 461
 462         if (!dm_task_set_name(dmt, mapname))
 463                 goto out;
 464
 465         if (!dm_task_run(dmt))
 466                 goto out;
 467
 468         if (!dm_task_get_info(dmt, &info))
 469                 goto out;
 470
 471         r = info.open_count;
 472         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 473                     goto out;
 474
 475         r = 0;
 476 out:
 477         dm_task_destroy(dmt);
 478         return r;
 479 }
 480
 481 int
 482 dm_get_opencount (const char * mapname)
 483 {
 484         int r = -1;
 485         struct dm_task *dmt;
 486         struct dm_info info;
 487
 488         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 489                 return 0;
 490
 491         if (!dm_task_set_name(dmt, mapname))
 492                 goto out;
 493
 494         if (!dm_task_run(dmt))
 495                 goto out;
 496
 497         if (!dm_task_get_info(dmt, &info))
 498                 goto out;
 499
 500         r = info.open_count;
 501 out:
 502         dm_task_destroy(dmt);
 503         return r;
 504 }
 505
 506 int
 507 dm_get_minor (char * mapname)
 508 {
 509         int r = -1;
 510         struct dm_task *dmt;
 511         struct dm_info info;
 512
 513         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 514                 return 0;
 515
 516         if (!dm_task_set_name(dmt, mapname))
 517                 goto out;
 518
 519         if (!dm_task_run(dmt))
 520                 goto out;
 521
 522         if (!dm_task_get_info(dmt, &info))
 523                 goto out;
 524
 525         r = info.minor;
 526 out:
 527         dm_task_destroy(dmt);
 528         return r;
 529 }
 530
 531 extern int
 532 dm_flush_map (const char * mapname)
 533 {
 534         int r;
 535
 536         if (!dm_map_present(mapname))
 537                 return 0;
 538
 539         if (dm_type(mapname, TGT_MPATH) <= 0)
 540                 return 0; /* nothing to do */
 541
 542         if (dm_remove_partmaps(mapname))
 543                 return 1;
 544
 545         if (dm_get_opencount(mapname)) {
 546                 condlog(2, "%s: map in use", mapname);
 547                 return 1;
 548         }
 549
 550         r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname);
 551
 552         if (r) {
 553                 condlog(4, "multipath map %s removed", mapname);
 554                 return 0;
 555         }
 556         return 1;
 557 }
 558
 559 extern int
 560 dm_flush_maps (void)
 561 {
 562         int r = 0;
 563         struct dm_task *dmt;
 564         struct dm_names *names;
 565         unsigned next = 0;
 566
 567         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 568                 return 0;
 569
 570         dm_task_no_open_count(dmt);
 571
 572         if (!dm_task_run (dmt))
 573                 goto out;
 574
 575         if (!(names = dm_task_get_names (dmt)))
 576                 goto out;
 577
 578         if (!names->dev)
 579                 goto out;
 580
 581         do {
 582                 r |= dm_flush_map(names->name);
 583                 next = names->next;
 584                 names = (void *) names + next;
 585         } while (next);
 586
 587         out:
 588         dm_task_destroy (dmt);
 589         return r;
 590 }
 591
 592 int
 593 dm_message(char * mapname, char * message)
 594 {
 595         int r = 1;
 596         struct dm_task *dmt;
 597
 598         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 599                 return 1;
 600
 601         if (!dm_task_set_name(dmt, mapname))
 602                 goto out;
 603
 604         if (!dm_task_set_sector(dmt, 0))
 605                 goto out;
 606
 607         if (!dm_task_set_message(dmt, message))
 608                 goto out;
 609
 610         dm_task_no_open_count(dmt);
 611
 612         if (!dm_task_run(dmt))
 613                 goto out;
 614
 615         r = 0;
 616 out:
 617         if (r)
 618                 condlog(0, "DM message failed [%s]", message);
 619
 620         dm_task_destroy(dmt);
 621         return r;
 622 }
 623
 624 int
 625 dm_fail_path(char * mapname, char * path)
 626 {
 627         char message[32];
 628
 629         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 630                 return 1;
 631
 632         return dm_message(mapname, message);
 633 }
 634
 635 int
 636 dm_reinstate_path(char * mapname, char * path)
 637 {
 638         char message[32];
 639
 640         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 641                 return 1;
 642
 643         return dm_message(mapname, message);
 644 }
 645
 646 int
 647 dm_queue_if_no_path(char *mapname, int enable)
 648 {
 649         char *message;
 650
 651         if (enable)
 652                 message = "queue_if_no_path\n";
 653         else
 654                 message = "fail_if_no_path\n";
 655
 656         return dm_message(mapname, message);
 657 }
 658
 659 int
 660 dm_set_pg_timeout(char *mapname, int timeout_val)
 661 {
 662         char message[24];
 663
 664         if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
 665                 return 1;
 666         return dm_message(mapname, message);
 667 }
 668
 669 static int
 670 dm_groupmsg (char * msg, char * mapname, int index)
 671 {
 672         char message[32];
 673
 674         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 675                 return 1;
 676
 677         return dm_message(mapname, message);
 678 }
 679
 680 int
 681 dm_switchgroup(char * mapname, int index)
 682 {
 683         return dm_groupmsg("switch", mapname, index);
 684 }
 685
 686 int
 687 dm_enablegroup(char * mapname, int index)
 688 {
 689         return dm_groupmsg("enable", mapname, index);
 690 }
 691
 692 int
 693 dm_disablegroup(char * mapname, int index)
 694 {
 695         return dm_groupmsg("disable", mapname, index);
 696 }
 697
 698 int
 699 dm_get_maps (vector mp)
 700 {
 701         struct multipath * mpp;
 702         int r = 1;
 703         int info;
 704         struct dm_task *dmt;
 705         struct dm_names *names;
 706         unsigned next = 0;
 707
 708         if (!mp)
 709                 return 1;
 710
 711         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 712                 return 1;
 713
 714         dm_task_no_open_count(dmt);
 715
 716         if (!dm_task_run(dmt))
 717                 goto out;
 718
 719         if (!(names = dm_task_get_names(dmt)))
 720                 goto out;
 721
 722         if (!names->dev) {
 723                 r = 0; /* this is perfectly valid */
 724                 goto out;
 725         }
 726
 727         do {
 728                 info = dm_type(names->name, TGT_MPATH);
 729
 730                 if (info <= 0)
 731                         goto next;
 732
 733                 mpp = alloc_multipath();
 734
 735                 if (!mpp)
 736                         goto out;
 737
 738                 mpp->alias = STRDUP(names->name);
 739
 740                 if (!mpp->alias)
 741                         goto out1;
 742
 743                 if (info > 0) {
 744                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 745                                 goto out1;
 746
 747                         if (dm_get_status(names->name, mpp->status))
 748                                 goto out1;
 749
 750                         dm_get_uuid(names->name, mpp->wwid);
 751                         dm_get_info(names->name, &mpp->dmi);
 752                 }
 753
 754                 if (!vector_alloc_slot(mp))
 755                         goto out1;
 756
 757                 vector_set_slot(mp, mpp);
 758                 mpp = NULL;
 759 next:
 760                 next = names->next;
 761                 names = (void *) names + next;
 762         } while (next);
 763
 764         r = 0;
 765         goto out;
 766 out1:
 767         free_multipath(mpp, KEEP_PATHS);
 768 out:
 769         dm_task_destroy (dmt);
 770         return r;
 771 }
 772
 773 extern int
 774 dm_get_name(char *uuid, char *name)
 775 {
 776         vector vec;
 777         struct multipath *mpp;
 778         int i, rc = 0;
 779
 780         vec = vector_alloc();
 781
 782         if (!vec)
 783                 return 0;
 784
 785         if (dm_get_maps(vec)) {
 786                 goto out;
 787         }
 788
 789         vector_foreach_slot(vec, mpp, i) {
 790                 if (!strcmp(uuid, mpp->wwid)) {
 791                         strcpy(name, mpp->alias);
 792                         rc=1;
 793                         break;
 794                 }
 795         }
 796 out:
 797         vector_foreach_slot(vec, mpp, i) {
 798                 free_multipath(mpp, KEEP_PATHS);
 799         }
 800         vector_free(vec);
 801         return rc;
 802 }
 803
 804 int
 805 dm_geteventnr (char *name)
 806 {
 807         struct dm_task *dmt;
 808         struct dm_info info;
 809
 810         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 811                 return 0;
 812
 813         if (!dm_task_set_name(dmt, name))
 814                 goto out;
 815
 816         dm_task_no_open_count(dmt);
 817
 818         if (!dm_task_run(dmt))
 819                 goto out;
 820
 821         if (!dm_task_get_info(dmt, &info)) {
 822                 info.event_nr = 0;
 823                 goto out;
 824         }
 825
 826         if (!info.exists) {
 827                 info.event_nr = 0;
 828                 goto out;
 829         }
 830
 831 out:
 832         dm_task_destroy(dmt);
 833
 834         return info.event_nr;
 835 }
 836
 837 char *
 838 dm_mapname(int major, int minor)
 839 {
 840         char * response = NULL;
 841         const char *map;
 842         struct dm_task *dmt;
 843         int r;
 844         int loop = MAX_WAIT * LOOPS_PER_SEC;
 845
 846         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 847                 return NULL;
 848
 849         if (!dm_task_set_major(dmt, major) ||
 850             !dm_task_set_minor(dmt, minor))
 851                 goto bad;
 852
 853         dm_task_no_open_count(dmt);
 854
 855         /*
 856          * device map might not be ready when we get here from
 857          * daemon uev_trigger -> uev_add_map
 858          */
 859         while (--loop) {
 860                 r = dm_task_run(dmt);
 861
 862                 if (r)
 863                         break;
 864
 865                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 866         }
 867
 868         if (!r) {
 869                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 870                 goto bad;
 871         }
 872
 873         map = dm_task_get_name(dmt);
 874         if (map && strlen(map))
 875                 response = STRDUP((char *)dm_task_get_name(dmt));
 876
 877         dm_task_destroy(dmt);
 878         return response;
 879 bad:
 880         dm_task_destroy(dmt);
 881         condlog(0, "%i:%i: error fetching map name", major, minor);
 882         return NULL;
 883 }
 884
 885 int
 886 dm_remove_partmaps (const char * mapname)
 887 {
 888         struct dm_task *dmt;
 889         struct dm_names *names;
 890         unsigned next = 0;
 891         char params[PARAMS_SIZE];
 892         unsigned long long size;
 893         char dev_t[32];
 894         int r = 1;
 895
 896         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 897                 return 1;
 898
 899         dm_task_no_open_count(dmt);
 900
 901         if (!dm_task_run(dmt))
 902                 goto out;
 903
 904         if (!(names = dm_task_get_names(dmt)))
 905                 goto out;
 906
 907         if (!names->dev) {
 908                 r = 0; /* this is perfectly valid */
 909                 goto out;
 910         }
 911
 912         if (dm_dev_t(mapname, &dev_t[0], 32))
 913                 goto out;
 914
 915         do {
 916                 if (
 917                     /*
 918                      * if devmap target is "linear"
 919                      */
 920                     (dm_type(names->name, TGT_PART) > 0) &&
 921
 922                     /*
 923                      * and the multipath mapname and the part mapname start
 924                      * the same
 925                      */
 926                     !strncmp(names->name, mapname, strlen(mapname)) &&
 927
 928                     /*
 929                      * and the opencount is 0 for us to allow removal
 930                      */
 931                     !dm_get_opencount(names->name) &&
 932
 933                     /*
 934                      * and we can fetch the map table from the kernel
 935                      */
 936                     !dm_get_map(names->name, &size, &params[0]) &&
 937
 938                     /*
 939                      * and the table maps over the multipath map
 940                      */
 941                     strstr(params, dev_t)
 942                    ) {
 943                                 /*
 944                                  * then it's a kpartx generated partition.
 945                                  * remove it.
 946                                  */
 947                                 condlog(4, "partition map %s removed",
 948                                         names->name);
 949                                 dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name);
 950                    }
 951
 952                 next = names->next;
 953                 names = (void *) names + next;
 954         } while (next);
 955
 956         r = 0;
 957 out:
 958         dm_task_destroy (dmt);
 959         return r;
 960 }
 961
 962 static struct dm_info *
 963 alloc_dminfo (void)
 964 {
 965         return MALLOC(sizeof(struct dm_info));
 966 }
 967
 968 int
 969 dm_get_info (char * mapname, struct dm_info ** dmi)
 970 {
 971         int r = 1;
 972         struct dm_task *dmt = NULL;
 973
 974         if (!mapname)
 975                 return 1;
 976
 977         if (!*dmi)
 978                 *dmi = alloc_dminfo();
 979
 980         if (!*dmi)
 981                 return 1;
 982
 983         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 984                 goto out;
 985
 986         if (!dm_task_set_name(dmt, mapname))
 987                 goto out;
 988
 989         dm_task_no_open_count(dmt);
 990
 991         if (!dm_task_run(dmt))
 992                 goto out;
 993
 994         if (!dm_task_get_info(dmt, *dmi))
 995                 goto out;
 996
 997         r = 0;
 998 out:
 999         if (r) {
1000                 memset(*dmi, 0, sizeof(struct dm_info));
1001                 FREE(*dmi);
1002                 *dmi = NULL;
1003         }
1004
1005         if (dmt)
1006                 dm_task_destroy(dmt);
1007
1008         return r;
1009 }
1010
1011 int
1012 dm_rename_partmaps (char * old, char * new)
1013 {
1014         struct dm_task *dmt;
1015         struct dm_names *names;
1016         unsigned next = 0;
1017         char buff[PARAMS_SIZE];
1018         unsigned long long size;
1019         char dev_t[32];
1020         int r = 1;
1021
1022         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1023                 return 1;
1024
1025         dm_task_no_open_count(dmt);
1026
1027         if (!dm_task_run(dmt))
1028                 goto out;
1029
1030         if (!(names = dm_task_get_names(dmt)))
1031                 goto out;
1032
1033         if (!names->dev) {
1034                 r = 0; /* this is perfectly valid */
1035                 goto out;
1036         }
1037
1038         if (dm_dev_t(old, &dev_t[0], 32))
1039                 goto out;
1040
1041         do {
1042                 if (
1043                     /*
1044                      * if devmap target is "linear"
1045                      */
1046                     (dm_type(names->name, TGT_PART) > 0) &&
1047
1048                     /*
1049                      * and the multipath mapname and the part mapname start
1050                      * the same
1051                      */
1052                     !strncmp(names->name, old, strlen(old)) &&
1053
1054                     /*
1055                      * and we can fetch the map table from the kernel
1056                      */
1057                     !dm_get_map(names->name, &size, &buff[0]) &&
1058
1059                     /*
1060                      * and the table maps over the multipath map
1061                      */
1062                     strstr(buff, dev_t)
1063                    ) {
1064                                 /*
1065                                  * then it's a kpartx generated partition.
1066                                  * Rename it.
1067                                  */
1068                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1069                                          new, names->name + strlen(old));
1070                                 dm_rename(names->name, buff);
1071                                 condlog(4, "partition map %s renamed",
1072                                         names->name);
1073                    }
1074
1075                 next = names->next;
1076                 names = (void *) names + next;
1077         } while (next);
1078
1079         r = 0;
1080 out:
1081         dm_task_destroy (dmt);
1082         return r;
1083 }
1084
1085 int
1086 dm_rename (char * old, char * new)
1087 {
1088         int r = 0;
1089         struct dm_task *dmt;
1090
1091         if (dm_rename_partmaps(old, new))
1092                 return r;
1093
1094         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1095                 return r;
1096
1097         if (!dm_task_set_name(dmt, old))
1098                 goto out;
1099
1100         if (!dm_task_set_newname(dmt, new))
1101                 goto out;
1102
1103         dm_task_no_open_count(dmt);
1104
1105         if (!dm_task_run(dmt))
1106                 goto out;
1107
1108         r = 1;
1109 out:
1110         dm_task_destroy(dmt);
1111         return r;
1112 }