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 #include "sysfs.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 #ifndef LIBDM_API_COOKIE
  36 static inline int dm_task_set_cookie(struct dm_task *dmt, uint32_t *c, int a)
  37 {
  38         return 1;
  39 }
  40
  41 void udev_wait(unsigned int c)
  42 {
  43 }
  44
  45 void udev_set_sync_support(int c)
  46 {
  47 }
  48 #else
  49 void udev_wait(unsigned int c)
  50 {
  51         dm_udev_wait(c);
  52 }
  53
  54 void udev_set_sync_support(int c)
  55 {
  56         dm_udev_set_sync_support(c);
  57 }
  58 #endif
  59
  60 static void
  61 dm_write_log (int level, const char *file, int line, const char *f, ...)
  62 {
  63         va_list ap;
  64         int thres;
  65
  66         if (level > 6)
  67                 level = 6;
  68
  69         thres = (conf) ? conf->verbosity : 0;
  70         if (thres <= 3 || level > thres)
  71                 return;
  72
  73         va_start(ap, f);
  74         if (logsink < 1) {
  75                 if (logsink == 0) {
  76                         time_t t = time(NULL);
  77                         struct tm *tb = localtime(&t);
  78                         char buff[16];
  79
  80                         strftime(buff, sizeof(buff), "%b %d %H:%M:%S", tb);
  81                         buff[sizeof(buff)-1] = '\0';
  82
  83                         fprintf(stdout, "%s | ", buff);
  84                 }
  85                 fprintf(stdout, "libdevmapper: %s(%i): ", file, line);
  86                 vfprintf(stdout, f, ap);
  87                 fprintf(stdout, "\n");
  88         } else {
  89                 condlog(level, "libdevmapper: %s(%i): ", file, line);
  90                 log_safe(level + 3, f, ap);
  91         }
  92         va_end(ap);
  93
  94         return;
  95 }
  96
  97 extern void
  98 dm_init(void) {
  99         dm_log_init(&dm_write_log);
 100         dm_log_init_verbose(conf ? conf->verbosity + 3 : 0);
 101 }
 102
 103 static int
 104 dm_lib_prereq (void)
 105 {
 106         char version[64];
 107         int v[3];
 108 #ifdef LIBDM_API_COOKIE
 109         int minv[3] = {1, 2, 38};
 110 #else
 111         int minv[3] = {1, 2, 8};
 112 #endif
 113
 114         dm_get_library_version(version, sizeof(version));
 115         condlog(3, "libdevmapper version %s", version);
 116         sscanf(version, "%d.%d.%d ", &v[0], &v[1], &v[2]);
 117
 118         if VERSION_GE(v, minv)
 119                 return 0;
 120         condlog(0, "libdevmapper version must be >= %d.%.2d.%.2d",
 121                 minv[0], minv[1], minv[2]);
 122         return 1;
 123 }
 124
 125 int
 126 dm_drv_version (unsigned int * version, char * str)
 127 {
 128         int r = 2;
 129         struct dm_task *dmt;
 130         struct dm_versions *target;
 131         struct dm_versions *last_target;
 132         unsigned int *v;
 133
 134         version[0] = 0;
 135         version[1] = 0;
 136         version[2] = 0;
 137
 138         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 139                 return 1;
 140
 141         dm_task_no_open_count(dmt);
 142
 143         if (!dm_task_run(dmt)) {
 144                 condlog(0, "Can not communicate with kernel DM");
 145                 goto out;
 146         }
 147         target = dm_task_get_versions(dmt);
 148
 149         do {
 150                 last_target = target;
 151                 if (!strncmp(str, target->name, strlen(str))) {
 152                         r = 1;
 153                         break;
 154                 }
 155                 target = (void *) target + target->next;
 156         } while (last_target != target);
 157
 158         if (r == 2) {
 159                 condlog(0, "DM %s kernel driver not loaded", str);
 160                 goto out;
 161         }
 162         v = target->version;
 163         version[0] = v[0];
 164         version[1] = v[1];
 165         version[2] = v[2];
 166         r = 0;
 167 out:
 168         dm_task_destroy(dmt);
 169         return r;
 170 }
 171
 172 static int
 173 dm_drv_prereq (void)
 174 {
 175         unsigned int minv[3] = {1, 0, 3};
 176         unsigned int version[3] = {0, 0, 0};
 177         unsigned int * v = version;
 178
 179         if (dm_drv_version(v, TGT_MPATH)) {
 180                 /* in doubt return not capable */
 181                 return 1;
 182         }
 183
 184         /* test request based multipath capability */
 185         condlog(3, "DM multipath kernel driver v%u.%u.%u",
 186                 v[0], v[1], v[2]);
 187
 188         if VERSION_GE(v, minv)
 189                 return 0;
 190
 191         condlog(0, "DM multipath kernel driver must be >= v%u.%u.%u",
 192                 minv[0], minv[1], minv[2]);
 193         return 1;
 194 }
 195
 196 extern int
 197 dm_prereq (void)
 198 {
 199         if (dm_lib_prereq())
 200                 return 1;
 201         return dm_drv_prereq();
 202 }
 203
 204 static int
 205 dm_simplecmd (int task, const char *name, int no_flush, int need_sync) {
 206         int r = 0;
 207         int udev_wait_flag = (need_sync && (task == DM_DEVICE_RESUME ||
 208                                             task == DM_DEVICE_REMOVE));
 209         struct dm_task *dmt;
 210
 211         if (!(dmt = dm_task_create (task)))
 212                 return 0;
 213
 214         if (!dm_task_set_name (dmt, name))
 215                 goto out;
 216
 217         dm_task_no_open_count(dmt);
 218         dm_task_skip_lockfs(dmt);       /* for DM_DEVICE_RESUME */
 219 #ifdef LIBDM_API_FLUSH
 220         if (no_flush)
 221                 dm_task_no_flush(dmt);          /* for DM_DEVICE_SUSPEND/RESUME */
 222 #endif
 223
 224         if (udev_wait_flag && !dm_task_set_cookie(dmt, &conf->cookie, (conf->daemon)? DM_UDEV_DISABLE_LIBRARY_FALLBACK : 0))
 225                 goto out;
 226         r = dm_task_run (dmt);
 227
 228         out:
 229         dm_task_destroy (dmt);
 230         return r;
 231 }
 232
 233 extern int
 234 dm_simplecmd_flush (int task, const char *name, int needsync) {
 235         return dm_simplecmd(task, name, 0, needsync);
 236 }
 237
 238 extern int
 239 dm_simplecmd_noflush (int task, const char *name) {
 240         return dm_simplecmd(task, name, 1, 1);
 241 }
 242
 243 extern int
 244 dm_addmap (int task, const char *target, struct multipath *mpp, char * params,
 245            int use_uuid, int ro) {
 246         int r = 0;
 247         struct dm_task *dmt;
 248         char *prefixed_uuid = NULL;
 249
 250         if (!(dmt = dm_task_create (task)))
 251                 return 0;
 252
 253         if (!dm_task_set_name (dmt, mpp->alias))
 254                 goto addout;
 255
 256         if (!dm_task_add_target (dmt, 0, mpp->size, target, params))
 257                 goto addout;
 258
 259         if (ro)
 260                 dm_task_set_ro(dmt);
 261
 262         if (use_uuid && strlen(mpp->wwid) > 0){
 263                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(mpp->wwid) + 1);
 264                 if (!prefixed_uuid) {
 265                         condlog(0, "cannot create prefixed uuid : %s",
 266                                 strerror(errno));
 267                         goto addout;
 268                 }
 269                 sprintf(prefixed_uuid, UUID_PREFIX "%s", mpp->wwid);
 270                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 271                         goto freeout;
 272         }
 273
 274         if (mpp->attribute_flags & (1 << ATTR_MODE) &&
 275             !dm_task_set_mode(dmt, mpp->mode))
 276                 goto freeout;
 277         if (mpp->attribute_flags & (1 << ATTR_UID) &&
 278             !dm_task_set_uid(dmt, mpp->uid))
 279                 goto freeout;
 280         if (mpp->attribute_flags & (1 << ATTR_GID) &&
 281             !dm_task_set_gid(dmt, mpp->gid))
 282                 goto freeout;
 283         condlog(4, "%s: addmap [0 %llu %s %s]", mpp->alias, mpp->size,
 284                 target, params);
 285
 286         dm_task_no_open_count(dmt);
 287
 288         if (task == DM_DEVICE_CREATE &&
 289             !dm_task_set_cookie(dmt, &conf->cookie, (conf->daemon)? DM_UDEV_DISABLE_LIBRARY_FALLBACK : 0))
 290                 goto freeout;
 291         r = dm_task_run (dmt);
 292
 293         freeout:
 294         if (prefixed_uuid)
 295                 FREE(prefixed_uuid);
 296
 297         addout:
 298         dm_task_destroy (dmt);
 299
 300         return r;
 301 }
 302
 303 static int
 304 _dm_addmap_create (struct multipath *mpp, char * params, int ro) {
 305         int r;
 306         r = dm_addmap(DM_DEVICE_CREATE, TGT_MPATH, mpp, params, 1, ro);
 307         /*
 308          * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
 309          * Failing the second part leaves an empty map. Clean it up.
 310          */
 311         if (!r && dm_map_present(mpp->alias)) {
 312                 condlog(3, "%s: failed to load map (a path might be in use)",
 313                         mpp->alias);
 314                 dm_flush_map_nosync(mpp->alias);
 315         }
 316         return r;
 317 }
 318
 319 #define ADDMAP_RW 0
 320 #define ADDMAP_RO 1
 321
 322 extern int
 323 dm_addmap_create (struct multipath *mpp, char *params) {
 324         return _dm_addmap_create(mpp, params, ADDMAP_RW);
 325 }
 326
 327 extern int
 328 dm_addmap_create_ro (struct multipath *mpp, char *params) {
 329         return _dm_addmap_create(mpp, params, ADDMAP_RO);
 330 }
 331
 332 extern int
 333 dm_addmap_reload (struct multipath *mpp, char *params) {
 334         return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, params, 0, ADDMAP_RW);
 335 }
 336
 337 extern int
 338 dm_addmap_reload_ro (struct multipath *mpp, char *params) {
 339         return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, params, 0, ADDMAP_RO);
 340 }
 341
 342 extern int
 343 dm_map_present (const char * str)
 344 {
 345         int r = 0;
 346         struct dm_task *dmt;
 347         struct dm_info info;
 348
 349         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 350                 return 0;
 351
 352         if (!dm_task_set_name(dmt, str))
 353                 goto out;
 354
 355         dm_task_no_open_count(dmt);
 356
 357         if (!dm_task_run(dmt))
 358                 goto out;
 359
 360         if (!dm_task_get_info(dmt, &info))
 361                 goto out;
 362
 363         if (info.exists)
 364                 r = 1;
 365 out:
 366         dm_task_destroy(dmt);
 367         return r;
 368 }
 369
 370 extern int
 371 dm_get_map(const char * name, unsigned long long * size, char * outparams)
 372 {
 373         int r = 1;
 374         struct dm_task *dmt;
 375         void *next = NULL;
 376         uint64_t start, length;
 377         char *target_type = NULL;
 378         char *params = NULL;
 379
 380         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 381                 return 1;
 382
 383         if (!dm_task_set_name(dmt, name))
 384                 goto out;
 385
 386         dm_task_no_open_count(dmt);
 387
 388         if (!dm_task_run(dmt))
 389                 goto out;
 390
 391         /* Fetch 1st target */
 392         next = dm_get_next_target(dmt, next, &start, &length,
 393                                   &target_type, &params);
 394
 395         if (size)
 396                 *size = length;
 397
 398         if (!outparams) {
 399                 r = 0;
 400                 goto out;
 401         }
 402         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 403                 r = 0;
 404 out:
 405         dm_task_destroy(dmt);
 406         return r;
 407 }
 408
 409 static int
 410 dm_get_prefixed_uuid(const char *name, char *uuid)
 411 {
 412         struct dm_task *dmt;
 413         const char *uuidtmp;
 414         int r = 1;
 415
 416         dmt = dm_task_create(DM_DEVICE_INFO);
 417         if (!dmt)
 418                 return 1;
 419
 420         if (!dm_task_set_name (dmt, name))
 421                 goto uuidout;
 422
 423         if (!dm_task_run(dmt))
 424                 goto uuidout;
 425
 426         uuidtmp = dm_task_get_uuid(dmt);
 427         if (uuidtmp)
 428                 strcpy(uuid, uuidtmp);
 429         else
 430                 uuid[0] = '\0';
 431
 432         r = 0;
 433 uuidout:
 434         dm_task_destroy(dmt);
 435         return r;
 436 }
 437
 438 extern int
 439 dm_get_uuid(char *name, char *uuid)
 440 {
 441         char uuidtmp[WWID_SIZE];
 442
 443         if (dm_get_prefixed_uuid(name, uuidtmp))
 444                 return 1;
 445
 446         if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 447                 strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 448         else
 449                 strcpy(uuid, uuidtmp);
 450
 451         return 0;
 452 }
 453
 454 /*
 455  * returns:
 456  *    0 : if both uuids end with same suffix which starts with UUID_PREFIX
 457  *    1 : otherwise
 458  */
 459 int
 460 dm_compare_uuid(const char* mapname1, const char* mapname2)
 461 {
 462         char *p1, *p2;
 463         char uuid1[WWID_SIZE], uuid2[WWID_SIZE];
 464
 465         if (dm_get_prefixed_uuid(mapname1, uuid1))
 466                 return 1;
 467
 468         if (dm_get_prefixed_uuid(mapname2, uuid2))
 469                 return 1;
 470
 471         p1 = strstr(uuid1, UUID_PREFIX);
 472         p2 = strstr(uuid2, UUID_PREFIX);
 473         if (p1 && p2 && !strcmp(p1, p2))
 474                 return 0;
 475
 476         return 1;
 477 }
 478
 479 extern int
 480 dm_get_status(char * name, char * outstatus)
 481 {
 482         int r = 1;
 483         struct dm_task *dmt;
 484         void *next = NULL;
 485         uint64_t start, length;
 486         char *target_type;
 487         char *status;
 488
 489         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 490                 return 1;
 491
 492         if (!dm_task_set_name(dmt, name))
 493                 goto out;
 494
 495         dm_task_no_open_count(dmt);
 496
 497         if (!dm_task_run(dmt))
 498                 goto out;
 499
 500         /* Fetch 1st target */
 501         next = dm_get_next_target(dmt, next, &start, &length,
 502                                   &target_type, &status);
 503
 504         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 505                 r = 0;
 506 out:
 507         if (r)
 508                 condlog(0, "%s: error getting map status string", name);
 509
 510         dm_task_destroy(dmt);
 511         return r;
 512 }
 513
 514 /*
 515  * returns:
 516  *    1 : match
 517  *    0 : no match
 518  *   -1 : empty map
 519  */
 520 extern int
 521 dm_type(const char * name, char * type)
 522 {
 523         int r = 0;
 524         struct dm_task *dmt;
 525         void *next = NULL;
 526         uint64_t start, length;
 527         char *target_type = NULL;
 528         char *params;
 529
 530         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 531                 return 0;
 532
 533         if (!dm_task_set_name(dmt, name))
 534                 goto out;
 535
 536         dm_task_no_open_count(dmt);
 537
 538         if (!dm_task_run(dmt))
 539                 goto out;
 540
 541         /* Fetch 1st target */
 542         next = dm_get_next_target(dmt, next, &start, &length,
 543                                   &target_type, &params);
 544
 545         if (!target_type)
 546                 r = -1;
 547         else if (!strcmp(target_type, type))
 548                 r = 1;
 549
 550 out:
 551         dm_task_destroy(dmt);
 552         return r;
 553 }
 554
 555 static int
 556 dm_dev_t (const char * mapname, char * dev_t, int len)
 557 {
 558         int r = 1;
 559         struct dm_task *dmt;
 560         struct dm_info info;
 561
 562         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 563                 return 0;
 564
 565         if (!dm_task_set_name(dmt, mapname))
 566                 goto out;
 567
 568         if (!dm_task_run(dmt))
 569                 goto out;
 570
 571         if (!dm_task_get_info(dmt, &info))
 572                 goto out;
 573
 574         r = info.open_count;
 575         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 576                     goto out;
 577
 578         r = 0;
 579 out:
 580         dm_task_destroy(dmt);
 581         return r;
 582 }
 583
 584 int
 585 dm_get_opencount (const char * mapname)
 586 {
 587         int r = -1;
 588         struct dm_task *dmt;
 589         struct dm_info info;
 590
 591         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 592                 return 0;
 593
 594         if (!dm_task_set_name(dmt, mapname))
 595                 goto out;
 596
 597         if (!dm_task_run(dmt))
 598                 goto out;
 599
 600         if (!dm_task_get_info(dmt, &info))
 601                 goto out;
 602
 603         r = info.open_count;
 604 out:
 605         dm_task_destroy(dmt);
 606         return r;
 607 }
 608
 609 int
 610 dm_get_major (char * mapname)
 611 {
 612         int r = -1;
 613         struct dm_task *dmt;
 614         struct dm_info info;
 615
 616         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 617                 return 0;
 618
 619         if (!dm_task_set_name(dmt, mapname))
 620                 goto out;
 621
 622         if (!dm_task_run(dmt))
 623                 goto out;
 624
 625         if (!dm_task_get_info(dmt, &info))
 626                 goto out;
 627
 628         r = info.major;
 629 out:
 630         dm_task_destroy(dmt);
 631         return r;
 632 }
 633
 634 int
 635 dm_get_minor (char * mapname)
 636 {
 637         int r = -1;
 638         struct dm_task *dmt;
 639         struct dm_info info;
 640
 641         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 642                 return 0;
 643
 644         if (!dm_task_set_name(dmt, mapname))
 645                 goto out;
 646
 647         if (!dm_task_run(dmt))
 648                 goto out;
 649
 650         if (!dm_task_get_info(dmt, &info))
 651                 goto out;
 652
 653         r = info.minor;
 654 out:
 655         dm_task_destroy(dmt);
 656         return r;
 657 }
 658
 659 extern int
 660 _dm_flush_map (const char * mapname, int need_sync)
 661 {
 662         int r;
 663
 664         if (!dm_map_present(mapname))
 665                 return 0;
 666
 667         if (dm_type(mapname, TGT_MPATH) <= 0)
 668                 return 0; /* nothing to do */
 669
 670         if (dm_remove_partmaps(mapname, need_sync))
 671                 return 1;
 672
 673         if (dm_get_opencount(mapname)) {
 674                 condlog(2, "%s: map in use", mapname);
 675                 return 1;
 676         }
 677
 678         r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname, need_sync);
 679
 680         if (r) {
 681                 condlog(4, "multipath map %s removed", mapname);
 682                 return 0;
 683         }
 684         return 1;
 685 }
 686
 687 extern int
 688 dm_suspend_and_flush_map (const char * mapname)
 689 {
 690         int s = 0, queue_if_no_path = 0;
 691         unsigned long long mapsize;
 692         char params[PARAMS_SIZE] = {0};
 693
 694         if (!dm_map_present(mapname))
 695                 return 0;
 696
 697         if (dm_type(mapname, TGT_MPATH) <= 0)
 698                 return 0; /* nothing to do */
 699
 700         if (!dm_get_map(mapname, &mapsize, params)) {
 701                 if (strstr(params, "queue_if_no_path"))
 702                         queue_if_no_path = 1;
 703         }
 704
 705         if (queue_if_no_path)
 706                 s = dm_queue_if_no_path((char *)mapname, 0);
 707         /* Leave queue_if_no_path alone if unset failed */
 708         if (s)
 709                 queue_if_no_path = 0;
 710         else
 711                 s = dm_simplecmd_flush(DM_DEVICE_SUSPEND, mapname, 0);
 712
 713         if (!dm_flush_map(mapname)) {
 714                 condlog(4, "multipath map %s removed", mapname);
 715                 return 0;
 716         }
 717         condlog(2, "failed to remove multipath map %s", mapname);
 718         dm_simplecmd_noflush(DM_DEVICE_RESUME, mapname);
 719         if (queue_if_no_path)
 720                 s = dm_queue_if_no_path((char *)mapname, 1);
 721         return 1;
 722 }
 723
 724 extern int
 725 dm_flush_maps (void)
 726 {
 727         int r = 0;
 728         struct dm_task *dmt;
 729         struct dm_names *names;
 730         unsigned next = 0;
 731
 732         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 733                 return 0;
 734
 735         dm_task_no_open_count(dmt);
 736
 737         if (!dm_task_run (dmt))
 738                 goto out;
 739
 740         if (!(names = dm_task_get_names (dmt)))
 741                 goto out;
 742
 743         if (!names->dev)
 744                 goto out;
 745
 746         do {
 747                 r |= dm_suspend_and_flush_map(names->name);
 748                 next = names->next;
 749                 names = (void *) names + next;
 750         } while (next);
 751
 752         out:
 753         dm_task_destroy (dmt);
 754         return r;
 755 }
 756
 757 int
 758 dm_message(char * mapname, char * message)
 759 {
 760         int r = 1;
 761         struct dm_task *dmt;
 762
 763         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 764                 return 1;
 765
 766         if (!dm_task_set_name(dmt, mapname))
 767                 goto out;
 768
 769         if (!dm_task_set_sector(dmt, 0))
 770                 goto out;
 771
 772         if (!dm_task_set_message(dmt, message))
 773                 goto out;
 774
 775         dm_task_no_open_count(dmt);
 776
 777         if (!dm_task_run(dmt))
 778                 goto out;
 779
 780         r = 0;
 781 out:
 782         if (r)
 783                 condlog(0, "DM message failed [%s]", message);
 784
 785         dm_task_destroy(dmt);
 786         return r;
 787 }
 788
 789 int
 790 dm_fail_path(char * mapname, char * path)
 791 {
 792         char message[32];
 793
 794         if (snprintf(message, 32, "fail_path %s", path) > 32)
 795                 return 1;
 796
 797         return dm_message(mapname, message);
 798 }
 799
 800 int
 801 dm_reinstate_path(char * mapname, char * path)
 802 {
 803         char message[32];
 804
 805         if (snprintf(message, 32, "reinstate_path %s", path) > 32)
 806                 return 1;
 807
 808         return dm_message(mapname, message);
 809 }
 810
 811 int
 812 dm_queue_if_no_path(char *mapname, int enable)
 813 {
 814         char *message;
 815
 816         if (enable)
 817                 message = "queue_if_no_path";
 818         else
 819                 message = "fail_if_no_path";
 820
 821         return dm_message(mapname, message);
 822 }
 823
 824 static int
 825 dm_groupmsg (char * msg, char * mapname, int index)
 826 {
 827         char message[32];
 828
 829         if (snprintf(message, 32, "%s_group %i", msg, index) > 32)
 830                 return 1;
 831
 832         return dm_message(mapname, message);
 833 }
 834
 835 int
 836 dm_switchgroup(char * mapname, int index)
 837 {
 838         return dm_groupmsg("switch", mapname, index);
 839 }
 840
 841 int
 842 dm_enablegroup(char * mapname, int index)
 843 {
 844         return dm_groupmsg("enable", mapname, index);
 845 }
 846
 847 int
 848 dm_disablegroup(char * mapname, int index)
 849 {
 850         return dm_groupmsg("disable", mapname, index);
 851 }
 852
 853 int
 854 dm_get_maps (vector mp)
 855 {
 856         struct multipath * mpp;
 857         int r = 1;
 858         int info;
 859         struct dm_task *dmt;
 860         struct dm_names *names;
 861         unsigned next = 0;
 862
 863         if (!mp)
 864                 return 1;
 865
 866         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 867                 return 1;
 868
 869         dm_task_no_open_count(dmt);
 870
 871         if (!dm_task_run(dmt))
 872                 goto out;
 873
 874         if (!(names = dm_task_get_names(dmt)))
 875                 goto out;
 876
 877         if (!names->dev) {
 878                 r = 0; /* this is perfectly valid */
 879                 goto out;
 880         }
 881
 882         do {
 883                 info = dm_type(names->name, TGT_MPATH);
 884
 885                 if (info <= 0)
 886                         goto next;
 887
 888                 mpp = alloc_multipath();
 889
 890                 if (!mpp)
 891                         goto out;
 892
 893                 mpp->alias = STRDUP(names->name);
 894
 895                 if (!mpp->alias)
 896                         goto out1;
 897
 898                 if (info > 0) {
 899                         if (dm_get_map(names->name, &mpp->size, NULL))
 900                                 goto out1;
 901
 902                         dm_get_uuid(names->name, mpp->wwid);
 903                         dm_get_info(names->name, &mpp->dmi);
 904                 }
 905
 906                 if (!vector_alloc_slot(mp))
 907                         goto out1;
 908
 909                 vector_set_slot(mp, mpp);
 910                 mpp = NULL;
 911 next:
 912                 next = names->next;
 913                 names = (void *) names + next;
 914         } while (next);
 915
 916         r = 0;
 917         goto out;
 918 out1:
 919         free_multipath(mpp, KEEP_PATHS);
 920 out:
 921         dm_task_destroy (dmt);
 922         return r;
 923 }
 924
 925 extern char *
 926 dm_get_name(char *uuid)
 927 {
 928         struct dm_task *dmt;
 929         struct dm_info info;
 930         char *prefixed_uuid, *name = NULL;
 931         const char *nametmp;
 932
 933         dmt = dm_task_create(DM_DEVICE_INFO);
 934         if (!dmt)
 935                 return NULL;
 936
 937         prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
 938         if (!prefixed_uuid) {
 939                 condlog(0, "cannot create prefixed uuid : %s",
 940                         strerror(errno));
 941                 goto freeout;
 942         }
 943         sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
 944         if (!dm_task_set_uuid(dmt, prefixed_uuid))
 945                 goto freeout;
 946
 947         if (!dm_task_run(dmt))
 948                 goto freeout;
 949
 950         if (!dm_task_get_info(dmt, &info) || !info.exists)
 951                 goto freeout;
 952
 953         nametmp = dm_task_get_name(dmt);
 954         if (nametmp && strlen(nametmp)) {
 955                 name = MALLOC(strlen(nametmp) + 1);
 956                 if (name)
 957                         strcpy(name, nametmp);
 958         } else {
 959                 condlog(2, "%s: no device-mapper name found", uuid);
 960         }
 961
 962 freeout:
 963         if (prefixed_uuid)
 964                 FREE(prefixed_uuid);
 965         dm_task_destroy(dmt);
 966
 967         return name;
 968 }
 969
 970 int
 971 dm_geteventnr (char *name)
 972 {
 973         struct dm_task *dmt;
 974         struct dm_info info;
 975         int event = -1;
 976
 977         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 978                 return -1;
 979
 980         if (!dm_task_set_name(dmt, name))
 981                 goto out;
 982
 983         dm_task_no_open_count(dmt);
 984
 985         if (!dm_task_run(dmt))
 986                 goto out;
 987
 988         if (!dm_task_get_info(dmt, &info))
 989                 goto out;
 990
 991         if (info.exists)
 992                 event = info.event_nr;
 993
 994 out:
 995         dm_task_destroy(dmt);
 996
 997         return event;
 998 }
 999
1000 char *
1001 dm_mapname(int major, int minor)
1002 {
1003         char * response = NULL;
1004         const char *map;
1005         struct dm_task *dmt;
1006         int r;
1007         int loop = MAX_WAIT * LOOPS_PER_SEC;
1008
1009         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
1010                 return NULL;
1011
1012         if (!dm_task_set_major(dmt, major) ||
1013             !dm_task_set_minor(dmt, minor))
1014                 goto bad;
1015
1016         dm_task_no_open_count(dmt);
1017
1018         /*
1019          * device map might not be ready when we get here from
1020          * daemon uev_trigger -> uev_add_map
1021          */
1022         while (--loop) {
1023                 r = dm_task_run(dmt);
1024
1025                 if (r)
1026                         break;
1027
1028                 usleep(1000 * 1000 / LOOPS_PER_SEC);
1029         }
1030
1031         if (!r) {
1032                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
1033                 goto bad;
1034         }
1035
1036         map = dm_task_get_name(dmt);
1037         if (map && strlen(map))
1038                 response = STRDUP((char *)dm_task_get_name(dmt));
1039
1040         dm_task_destroy(dmt);
1041         return response;
1042 bad:
1043         dm_task_destroy(dmt);
1044         condlog(0, "%i:%i: error fetching map name", major, minor);
1045         return NULL;
1046 }
1047
1048 int
1049 dm_remove_partmaps (const char * mapname, int need_sync)
1050 {
1051         struct dm_task *dmt;
1052         struct dm_names *names;
1053         unsigned next = 0;
1054         char params[PARAMS_SIZE];
1055         unsigned long long size;
1056         char dev_t[32];
1057         int r = 1;
1058
1059         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1060                 return 1;
1061
1062         dm_task_no_open_count(dmt);
1063
1064         if (!dm_task_run(dmt))
1065                 goto out;
1066
1067         if (!(names = dm_task_get_names(dmt)))
1068                 goto out;
1069
1070         if (!names->dev) {
1071                 r = 0; /* this is perfectly valid */
1072                 goto out;
1073         }
1074
1075         if (dm_dev_t(mapname, &dev_t[0], 32))
1076                 goto out;
1077
1078         do {
1079                 if (
1080                     /*
1081                      * if devmap target is "linear"
1082                      */
1083                     (dm_type(names->name, TGT_PART) > 0) &&
1084
1085                     /*
1086                      * and both uuid end with same suffix starting
1087                      * at UUID_PREFIX
1088                      */
1089                     (!dm_compare_uuid(names->name, mapname)) &&
1090
1091                     /*
1092                      * and we can fetch the map table from the kernel
1093                      */
1094                     !dm_get_map(names->name, &size, &params[0]) &&
1095
1096                     /*
1097                      * and the table maps over the multipath map
1098                      */
1099                     strstr(params, dev_t)
1100                    ) {
1101                         /*
1102                          * then it's a kpartx generated partition.
1103                          * remove it.
1104                          */
1105                         /*
1106                          * if the opencount is 0 maybe some other
1107                          * partitions depend on it.
1108                          */
1109                         if (dm_get_opencount(names->name)) {
1110                                 dm_remove_partmaps(names->name, need_sync);
1111                                 if (dm_get_opencount(names->name)) {
1112                                         condlog(2, "%s: map in use",
1113                                                 names->name);
1114                                         goto out;
1115                                 }
1116                         }
1117                         condlog(4, "partition map %s removed",
1118                                 names->name);
1119                         dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name,
1120                                            need_sync);
1121                 }
1122
1123                 next = names->next;
1124                 names = (void *) names + next;
1125         } while (next);
1126
1127         r = 0;
1128 out:
1129         dm_task_destroy (dmt);
1130         return r;
1131 }
1132
1133 static struct dm_info *
1134 alloc_dminfo (void)
1135 {
1136         return MALLOC(sizeof(struct dm_info));
1137 }
1138
1139 int
1140 dm_get_info (char * mapname, struct dm_info ** dmi)
1141 {
1142         int r = 1;
1143         struct dm_task *dmt = NULL;
1144
1145         if (!mapname)
1146                 return 1;
1147
1148         if (!*dmi)
1149                 *dmi = alloc_dminfo();
1150
1151         if (!*dmi)
1152                 return 1;
1153
1154         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
1155                 goto out;
1156
1157         if (!dm_task_set_name(dmt, mapname))
1158                 goto out;
1159
1160         dm_task_no_open_count(dmt);
1161
1162         if (!dm_task_run(dmt))
1163                 goto out;
1164
1165         if (!dm_task_get_info(dmt, *dmi))
1166                 goto out;
1167
1168         r = 0;
1169 out:
1170         if (r) {
1171                 memset(*dmi, 0, sizeof(struct dm_info));
1172                 FREE(*dmi);
1173                 *dmi = NULL;
1174         }
1175
1176         if (dmt)
1177                 dm_task_destroy(dmt);
1178
1179         return r;
1180 }
1181
1182 int
1183 dm_rename_partmaps (char * old, char * new)
1184 {
1185         struct dm_task *dmt;
1186         struct dm_names *names;
1187         unsigned next = 0;
1188         char buff[PARAMS_SIZE];
1189         unsigned long long size;
1190         char dev_t[32];
1191         int r = 1;
1192
1193         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1194                 return 1;
1195
1196         dm_task_no_open_count(dmt);
1197
1198         if (!dm_task_run(dmt))
1199                 goto out;
1200
1201         if (!(names = dm_task_get_names(dmt)))
1202                 goto out;
1203
1204         if (!names->dev) {
1205                 r = 0; /* this is perfectly valid */
1206                 goto out;
1207         }
1208
1209         if (dm_dev_t(old, &dev_t[0], 32))
1210                 goto out;
1211
1212         do {
1213                 if (
1214                     /*
1215                      * if devmap target is "linear"
1216                      */
1217                     (dm_type(names->name, TGT_PART) > 0) &&
1218
1219                     /*
1220                      * and the multipath mapname and the part mapname start
1221                      * the same
1222                      */
1223                     !strncmp(names->name, old, strlen(old)) &&
1224
1225                     /*
1226                      * and we can fetch the map table from the kernel
1227                      */
1228                     !dm_get_map(names->name, &size, &buff[0]) &&
1229
1230                     /*
1231                      * and the table maps over the multipath map
1232                      */
1233                     strstr(buff, dev_t)
1234                    ) {
1235                                 /*
1236                                  * then it's a kpartx generated partition.
1237                                  * Rename it.
1238                                  */
1239                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1240                                          new, names->name + strlen(old));
1241                                 dm_rename(names->name, buff);
1242                                 condlog(4, "partition map %s renamed",
1243                                         names->name);
1244                    }
1245
1246                 next = names->next;
1247                 names = (void *) names + next;
1248         } while (next);
1249
1250         r = 0;
1251 out:
1252         dm_task_destroy (dmt);
1253         return r;
1254 }
1255
1256 int
1257 dm_rename (char * old, char * new)
1258 {
1259         int r = 0;
1260         struct dm_task *dmt;
1261
1262         if (dm_rename_partmaps(old, new))
1263                 return r;
1264
1265         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1266                 return r;
1267
1268         if (!dm_task_set_name(dmt, old))
1269                 goto out;
1270
1271         if (!dm_task_set_newname(dmt, new))
1272                 goto out;
1273
1274         dm_task_no_open_count(dmt);
1275
1276         if (!dm_task_set_cookie(dmt, &conf->cookie, (conf->daemon)? DM_UDEV_DISABLE_LIBRARY_FALLBACK : 0))
1277                 goto out;
1278         if (!dm_task_run(dmt))
1279                 goto out;
1280
1281         r = 1;
1282 out:
1283         dm_task_destroy(dmt);
1284         return r;
1285 }
1286
1287 void dm_reassign_deps(char *table, char *dep, char *newdep)
1288 {
1289         char *p, *n;
1290         char newtable[PARAMS_SIZE];
1291
1292         strcpy(newtable, table);
1293         p = strstr(newtable, dep);
1294         n = table + (p - newtable);
1295         strcpy(n, newdep);
1296         n += strlen(newdep);
1297         p += strlen(dep);
1298         strcat(n, p);
1299 }
1300
1301 int dm_reassign_table(const char *name, char *old, char *new)
1302 {
1303         int r, modified = 0;
1304         uint64_t start, length;
1305         struct dm_task *dmt, *reload_dmt;
1306         char *target, *params = NULL;
1307         char buff[PARAMS_SIZE];
1308         void *next = NULL;
1309
1310         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
1311                 return 0;
1312
1313         if (!dm_task_set_name(dmt, name))
1314                 goto out;
1315
1316         dm_task_no_open_count(dmt);
1317
1318         if (!dm_task_run(dmt))
1319                 goto out;
1320         if (!(reload_dmt = dm_task_create(DM_DEVICE_RELOAD)))
1321                 goto out;
1322         if (!dm_task_set_name(reload_dmt, name))
1323                 goto out_reload;
1324
1325         do {
1326                 next = dm_get_next_target(dmt, next, &start, &length,
1327                                           &target, &params);
1328                 memset(buff, 0, PARAMS_SIZE);
1329                 strcpy(buff, params);
1330                 if (strcmp(target, TGT_MPATH) && strstr(params, old)) {
1331                         condlog(3, "%s: replace target %s %s",
1332                                 name, target, buff);
1333                         dm_reassign_deps(buff, old, new);
1334                         condlog(3, "%s: with target %s %s",
1335                                 name, target, buff);
1336                         modified++;
1337                 }
1338                 dm_task_add_target(reload_dmt, start, length, target, buff);
1339         } while (next);
1340
1341         if (modified) {
1342                 dm_task_no_open_count(reload_dmt);
1343
1344                 if (!dm_task_run(reload_dmt)) {
1345                         condlog(3, "%s: failed to reassign targets", name);
1346                         goto out_reload;
1347                 }
1348                 dm_simplecmd_noflush(DM_DEVICE_RESUME, name);
1349         }
1350         r = 1;
1351
1352 out_reload:
1353         dm_task_destroy(reload_dmt);
1354 out:
1355         dm_task_destroy(dmt);
1356         return r;
1357 }
1358
1359
1360 /*
1361  * Reassign existing device-mapper table(s) to not use
1362  * the block devices but point to the multipathed
1363  * device instead
1364  */
1365 int dm_reassign(const char *mapname)
1366 {
1367         struct dm_deps *deps;
1368         struct dm_task *dmt;
1369         struct dm_info info;
1370         char dev_t[32], dm_dep[32];
1371         int r = 0, i;
1372
1373         if (dm_dev_t(mapname, &dev_t[0], 32)) {
1374                 condlog(3, "%s: failed to get device number", mapname);
1375                 return 1;
1376         }
1377
1378         if (!(dmt = dm_task_create(DM_DEVICE_DEPS))) {
1379                 condlog(3, "%s: couldn't make dm task", mapname);
1380                 return 0;
1381         }
1382
1383         if (!dm_task_set_name(dmt, mapname))
1384                 goto out;
1385
1386         dm_task_no_open_count(dmt);
1387
1388         if (!dm_task_run(dmt))
1389                 goto out;
1390
1391         if (!dm_task_get_info(dmt, &info))
1392                 goto out;
1393
1394         if (!(deps = dm_task_get_deps(dmt)))
1395                 goto out;
1396
1397         if (!info.exists)
1398                 goto out;
1399
1400         for (i = 0; i < deps->count; i++) {
1401                 sprintf(dm_dep, "%d:%d",
1402                         major(deps->device[i]),
1403                         minor(deps->device[i]));
1404                 sysfs_check_holders(dm_dep, dev_t);
1405         }
1406
1407         dm_task_destroy (dmt);
1408
1409         r = 1;
1410 out:
1411         return r;
1412 }
1413
1414 int dm_setgeometry(struct multipath *mpp)
1415 {
1416         struct dm_task *dmt;
1417         struct path *pp;
1418         char heads[4], sectors[4];
1419         char cylinders[10], start[32];
1420         int r = 0;
1421
1422         if (!mpp)
1423                 return 1;
1424
1425         pp = first_path(mpp);
1426         if (!pp) {
1427                 condlog(3, "%s: no path for geometry", mpp->alias);
1428                 return 1;
1429         }
1430         if (pp->geom.cylinders == 0 ||
1431             pp->geom.heads == 0 ||
1432             pp->geom.sectors == 0) {
1433                 condlog(3, "%s: invalid geometry on %s", mpp->alias, pp->dev);
1434                 return 1;
1435         }
1436
1437         if (!(dmt = dm_task_create(DM_DEVICE_SET_GEOMETRY)))
1438                 return 0;
1439
1440         if (!dm_task_set_name(dmt, mpp->alias))
1441                 goto out;
1442
1443         dm_task_no_open_count(dmt);
1444
1445         /* What a sick interface ... */
1446         snprintf(heads, 4, "%u", pp->geom.heads);
1447         snprintf(sectors, 4, "%u", pp->geom.sectors);
1448         snprintf(cylinders, 10, "%u", pp->geom.cylinders);
1449         snprintf(start, 32, "%lu", pp->geom.start);
1450         if (!dm_task_set_geometry(dmt, cylinders, heads, sectors, start)) {
1451                 condlog(3, "%s: Failed to set geometry", mpp->alias);
1452                 goto out;
1453         }
1454
1455         r = dm_task_run(dmt);
1456 out:
1457         dm_task_destroy(dmt);
1458
1459         return r;
1460 }