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 extern int
 304 dm_addmap_create (struct multipath *mpp, char * params) {
 305         int ro;
 306
 307         for (ro = 0; ro <= 1; ro++) {
 308                 int err;
 309
 310                 if (dm_addmap(DM_DEVICE_CREATE, TGT_MPATH, mpp, params, 1, ro))
 311                         return 1;
 312                 /*
 313                  * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
 314                  * Failing the second part leaves an empty map. Clean it up.
 315                  */
 316                 err = errno;
 317                 if (dm_map_present(mpp->alias)) {
 318                         condlog(3, "%s: failed to load map (a path might be in use)", mpp->alias);
 319                         dm_flush_map_nosync(mpp->alias);
 320                 }
 321                 if (err != EROFS)
 322                         break;
 323         }
 324         return 0;
 325 }
 326
 327 #define ADDMAP_RW 0
 328 #define ADDMAP_RO 1
 329
 330 extern int
 331 dm_addmap_reload (struct multipath *mpp, char *params) {
 332         if (dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, params, 0, ADDMAP_RW))
 333                 return 1;
 334         if (errno != EROFS)
 335                 return 0;
 336         return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, params, 0, ADDMAP_RO);
 337 }
 338
 339 extern int
 340 dm_map_present (const char * str)
 341 {
 342         int r = 0;
 343         struct dm_task *dmt;
 344         struct dm_info info;
 345
 346         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 347                 return 0;
 348
 349         if (!dm_task_set_name(dmt, str))
 350                 goto out;
 351
 352         dm_task_no_open_count(dmt);
 353
 354         if (!dm_task_run(dmt))
 355                 goto out;
 356
 357         if (!dm_task_get_info(dmt, &info))
 358                 goto out;
 359
 360         if (info.exists)
 361                 r = 1;
 362 out:
 363         dm_task_destroy(dmt);
 364         return r;
 365 }
 366
 367 extern int
 368 dm_get_map(const char * name, unsigned long long * size, char * outparams)
 369 {
 370         int r = 1;
 371         struct dm_task *dmt;
 372         void *next = NULL;
 373         uint64_t start, length;
 374         char *target_type = NULL;
 375         char *params = NULL;
 376
 377         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 378                 return 1;
 379
 380         if (!dm_task_set_name(dmt, name))
 381                 goto out;
 382
 383         dm_task_no_open_count(dmt);
 384
 385         if (!dm_task_run(dmt))
 386                 goto out;
 387
 388         /* Fetch 1st target */
 389         next = dm_get_next_target(dmt, next, &start, &length,
 390                                   &target_type, &params);
 391
 392         if (size)
 393                 *size = length;
 394
 395         if (!outparams) {
 396                 r = 0;
 397                 goto out;
 398         }
 399         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 400                 r = 0;
 401 out:
 402         dm_task_destroy(dmt);
 403         return r;
 404 }
 405
 406 static int
 407 dm_get_prefixed_uuid(const char *name, char *uuid)
 408 {
 409         struct dm_task *dmt;
 410         const char *uuidtmp;
 411         int r = 1;
 412
 413         dmt = dm_task_create(DM_DEVICE_INFO);
 414         if (!dmt)
 415                 return 1;
 416
 417         if (!dm_task_set_name (dmt, name))
 418                 goto uuidout;
 419
 420         if (!dm_task_run(dmt))
 421                 goto uuidout;
 422
 423         uuidtmp = dm_task_get_uuid(dmt);
 424         if (uuidtmp)
 425                 strcpy(uuid, uuidtmp);
 426         else
 427                 uuid[0] = '\0';
 428
 429         r = 0;
 430 uuidout:
 431         dm_task_destroy(dmt);
 432         return r;
 433 }
 434
 435 extern int
 436 dm_get_uuid(char *name, char *uuid)
 437 {
 438         char uuidtmp[WWID_SIZE];
 439
 440         if (dm_get_prefixed_uuid(name, uuidtmp))
 441                 return 1;
 442
 443         if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 444                 strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 445         else
 446                 strcpy(uuid, uuidtmp);
 447
 448         return 0;
 449 }
 450
 451 /*
 452  * returns:
 453  *    0 : if both uuids end with same suffix which starts with UUID_PREFIX
 454  *    1 : otherwise
 455  */
 456 int
 457 dm_compare_uuid(const char* mapname1, const char* mapname2)
 458 {
 459         char *p1, *p2;
 460         char uuid1[WWID_SIZE], uuid2[WWID_SIZE];
 461
 462         if (dm_get_prefixed_uuid(mapname1, uuid1))
 463                 return 1;
 464
 465         if (dm_get_prefixed_uuid(mapname2, uuid2))
 466                 return 1;
 467
 468         p1 = strstr(uuid1, UUID_PREFIX);
 469         p2 = strstr(uuid2, UUID_PREFIX);
 470         if (p1 && p2 && !strcmp(p1, p2))
 471                 return 0;
 472
 473         return 1;
 474 }
 475
 476 extern int
 477 dm_get_status(char * name, char * outstatus)
 478 {
 479         int r = 1;
 480         struct dm_task *dmt;
 481         void *next = NULL;
 482         uint64_t start, length;
 483         char *target_type;
 484         char *status;
 485
 486         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 487                 return 1;
 488
 489         if (!dm_task_set_name(dmt, name))
 490                 goto out;
 491
 492         dm_task_no_open_count(dmt);
 493
 494         if (!dm_task_run(dmt))
 495                 goto out;
 496
 497         /* Fetch 1st target */
 498         next = dm_get_next_target(dmt, next, &start, &length,
 499                                   &target_type, &status);
 500
 501         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 502                 r = 0;
 503 out:
 504         if (r)
 505                 condlog(0, "%s: error getting map status string", name);
 506
 507         dm_task_destroy(dmt);
 508         return r;
 509 }
 510
 511 /*
 512  * returns:
 513  *    1 : match
 514  *    0 : no match
 515  *   -1 : empty map
 516  */
 517 extern int
 518 dm_type(const char * name, char * type)
 519 {
 520         int r = 0;
 521         struct dm_task *dmt;
 522         void *next = NULL;
 523         uint64_t start, length;
 524         char *target_type = NULL;
 525         char *params;
 526
 527         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 528                 return 0;
 529
 530         if (!dm_task_set_name(dmt, name))
 531                 goto out;
 532
 533         dm_task_no_open_count(dmt);
 534
 535         if (!dm_task_run(dmt))
 536                 goto out;
 537
 538         /* Fetch 1st target */
 539         next = dm_get_next_target(dmt, next, &start, &length,
 540                                   &target_type, &params);
 541
 542         if (!target_type)
 543                 r = -1;
 544         else if (!strcmp(target_type, type))
 545                 r = 1;
 546
 547 out:
 548         dm_task_destroy(dmt);
 549         return r;
 550 }
 551
 552 static int
 553 dm_dev_t (const char * mapname, char * dev_t, int len)
 554 {
 555         int r = 1;
 556         struct dm_task *dmt;
 557         struct dm_info info;
 558
 559         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 560                 return 0;
 561
 562         if (!dm_task_set_name(dmt, mapname))
 563                 goto out;
 564
 565         if (!dm_task_run(dmt))
 566                 goto out;
 567
 568         if (!dm_task_get_info(dmt, &info))
 569                 goto out;
 570
 571         r = info.open_count;
 572         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 573                     goto out;
 574
 575         r = 0;
 576 out:
 577         dm_task_destroy(dmt);
 578         return r;
 579 }
 580
 581 int
 582 dm_get_opencount (const char * mapname)
 583 {
 584         int r = -1;
 585         struct dm_task *dmt;
 586         struct dm_info info;
 587
 588         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 589                 return 0;
 590
 591         if (!dm_task_set_name(dmt, mapname))
 592                 goto out;
 593
 594         if (!dm_task_run(dmt))
 595                 goto out;
 596
 597         if (!dm_task_get_info(dmt, &info))
 598                 goto out;
 599
 600         r = info.open_count;
 601 out:
 602         dm_task_destroy(dmt);
 603         return r;
 604 }
 605
 606 int
 607 dm_get_major (char * mapname)
 608 {
 609         int r = -1;
 610         struct dm_task *dmt;
 611         struct dm_info info;
 612
 613         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 614                 return 0;
 615
 616         if (!dm_task_set_name(dmt, mapname))
 617                 goto out;
 618
 619         if (!dm_task_run(dmt))
 620                 goto out;
 621
 622         if (!dm_task_get_info(dmt, &info))
 623                 goto out;
 624
 625         r = info.major;
 626 out:
 627         dm_task_destroy(dmt);
 628         return r;
 629 }
 630
 631 int
 632 dm_get_minor (char * mapname)
 633 {
 634         int r = -1;
 635         struct dm_task *dmt;
 636         struct dm_info info;
 637
 638         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 639                 return 0;
 640
 641         if (!dm_task_set_name(dmt, mapname))
 642                 goto out;
 643
 644         if (!dm_task_run(dmt))
 645                 goto out;
 646
 647         if (!dm_task_get_info(dmt, &info))
 648                 goto out;
 649
 650         r = info.minor;
 651 out:
 652         dm_task_destroy(dmt);
 653         return r;
 654 }
 655
 656 extern int
 657 _dm_flush_map (const char * mapname, int need_sync)
 658 {
 659         int r;
 660
 661         if (!dm_map_present(mapname))
 662                 return 0;
 663
 664         if (dm_type(mapname, TGT_MPATH) <= 0)
 665                 return 0; /* nothing to do */
 666
 667         if (dm_remove_partmaps(mapname, need_sync))
 668                 return 1;
 669
 670         if (dm_get_opencount(mapname)) {
 671                 condlog(2, "%s: map in use", mapname);
 672                 return 1;
 673         }
 674
 675         r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname, need_sync);
 676
 677         if (r) {
 678                 condlog(4, "multipath map %s removed", mapname);
 679                 return 0;
 680         }
 681         return 1;
 682 }
 683
 684 extern int
 685 dm_suspend_and_flush_map (const char * mapname)
 686 {
 687         int s = 0, queue_if_no_path = 0;
 688         unsigned long long mapsize;
 689         char params[PARAMS_SIZE] = {0};
 690
 691         if (!dm_map_present(mapname))
 692                 return 0;
 693
 694         if (dm_type(mapname, TGT_MPATH) <= 0)
 695                 return 0; /* nothing to do */
 696
 697         if (!dm_get_map(mapname, &mapsize, params)) {
 698                 if (strstr(params, "queue_if_no_path"))
 699                         queue_if_no_path = 1;
 700         }
 701
 702         if (queue_if_no_path)
 703                 s = dm_queue_if_no_path((char *)mapname, 0);
 704         /* Leave queue_if_no_path alone if unset failed */
 705         if (s)
 706                 queue_if_no_path = 0;
 707         else
 708                 s = dm_simplecmd_flush(DM_DEVICE_SUSPEND, mapname, 0);
 709
 710         if (!dm_flush_map(mapname)) {
 711                 condlog(4, "multipath map %s removed", mapname);
 712                 return 0;
 713         }
 714         condlog(2, "failed to remove multipath map %s", mapname);
 715         dm_simplecmd_noflush(DM_DEVICE_RESUME, mapname);
 716         if (queue_if_no_path)
 717                 s = dm_queue_if_no_path((char *)mapname, 1);
 718         return 1;
 719 }
 720
 721 extern int
 722 dm_flush_maps (void)
 723 {
 724         int r = 0;
 725         struct dm_task *dmt;
 726         struct dm_names *names;
 727         unsigned next = 0;
 728
 729         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 730                 return 0;
 731
 732         dm_task_no_open_count(dmt);
 733
 734         if (!dm_task_run (dmt))
 735                 goto out;
 736
 737         if (!(names = dm_task_get_names (dmt)))
 738                 goto out;
 739
 740         if (!names->dev)
 741                 goto out;
 742
 743         do {
 744                 r |= dm_suspend_and_flush_map(names->name);
 745                 next = names->next;
 746                 names = (void *) names + next;
 747         } while (next);
 748
 749         out:
 750         dm_task_destroy (dmt);
 751         return r;
 752 }
 753
 754 int
 755 dm_message(char * mapname, char * message)
 756 {
 757         int r = 1;
 758         struct dm_task *dmt;
 759
 760         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 761                 return 1;
 762
 763         if (!dm_task_set_name(dmt, mapname))
 764                 goto out;
 765
 766         if (!dm_task_set_sector(dmt, 0))
 767                 goto out;
 768
 769         if (!dm_task_set_message(dmt, message))
 770                 goto out;
 771
 772         dm_task_no_open_count(dmt);
 773
 774         if (!dm_task_run(dmt))
 775                 goto out;
 776
 777         r = 0;
 778 out:
 779         if (r)
 780                 condlog(0, "DM message failed [%s]", message);
 781
 782         dm_task_destroy(dmt);
 783         return r;
 784 }
 785
 786 int
 787 dm_fail_path(char * mapname, char * path)
 788 {
 789         char message[32];
 790
 791         if (snprintf(message, 32, "fail_path %s", path) > 32)
 792                 return 1;
 793
 794         return dm_message(mapname, message);
 795 }
 796
 797 int
 798 dm_reinstate_path(char * mapname, char * path)
 799 {
 800         char message[32];
 801
 802         if (snprintf(message, 32, "reinstate_path %s", path) > 32)
 803                 return 1;
 804
 805         return dm_message(mapname, message);
 806 }
 807
 808 int
 809 dm_queue_if_no_path(char *mapname, int enable)
 810 {
 811         char *message;
 812
 813         if (enable)
 814                 message = "queue_if_no_path";
 815         else
 816                 message = "fail_if_no_path";
 817
 818         return dm_message(mapname, message);
 819 }
 820
 821 static int
 822 dm_groupmsg (char * msg, char * mapname, int index)
 823 {
 824         char message[32];
 825
 826         if (snprintf(message, 32, "%s_group %i", msg, index) > 32)
 827                 return 1;
 828
 829         return dm_message(mapname, message);
 830 }
 831
 832 int
 833 dm_switchgroup(char * mapname, int index)
 834 {
 835         return dm_groupmsg("switch", mapname, index);
 836 }
 837
 838 int
 839 dm_enablegroup(char * mapname, int index)
 840 {
 841         return dm_groupmsg("enable", mapname, index);
 842 }
 843
 844 int
 845 dm_disablegroup(char * mapname, int index)
 846 {
 847         return dm_groupmsg("disable", mapname, index);
 848 }
 849
 850 int
 851 dm_get_maps (vector mp)
 852 {
 853         struct multipath * mpp;
 854         int r = 1;
 855         int info;
 856         struct dm_task *dmt;
 857         struct dm_names *names;
 858         unsigned next = 0;
 859
 860         if (!mp)
 861                 return 1;
 862
 863         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 864                 return 1;
 865
 866         dm_task_no_open_count(dmt);
 867
 868         if (!dm_task_run(dmt))
 869                 goto out;
 870
 871         if (!(names = dm_task_get_names(dmt)))
 872                 goto out;
 873
 874         if (!names->dev) {
 875                 r = 0; /* this is perfectly valid */
 876                 goto out;
 877         }
 878
 879         do {
 880                 info = dm_type(names->name, TGT_MPATH);
 881
 882                 if (info <= 0)
 883                         goto next;
 884
 885                 mpp = alloc_multipath();
 886
 887                 if (!mpp)
 888                         goto out;
 889
 890                 mpp->alias = STRDUP(names->name);
 891
 892                 if (!mpp->alias)
 893                         goto out1;
 894
 895                 if (info > 0) {
 896                         if (dm_get_map(names->name, &mpp->size, NULL))
 897                                 goto out1;
 898
 899                         dm_get_uuid(names->name, mpp->wwid);
 900                         dm_get_info(names->name, &mpp->dmi);
 901                 }
 902
 903                 if (!vector_alloc_slot(mp))
 904                         goto out1;
 905
 906                 vector_set_slot(mp, mpp);
 907                 mpp = NULL;
 908 next:
 909                 next = names->next;
 910                 names = (void *) names + next;
 911         } while (next);
 912
 913         r = 0;
 914         goto out;
 915 out1:
 916         free_multipath(mpp, KEEP_PATHS);
 917 out:
 918         dm_task_destroy (dmt);
 919         return r;
 920 }
 921
 922 int
 923 dm_geteventnr (char *name)
 924 {
 925         struct dm_task *dmt;
 926         struct dm_info info;
 927         int event = -1;
 928
 929         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 930                 return -1;
 931
 932         if (!dm_task_set_name(dmt, name))
 933                 goto out;
 934
 935         dm_task_no_open_count(dmt);
 936
 937         if (!dm_task_run(dmt))
 938                 goto out;
 939
 940         if (!dm_task_get_info(dmt, &info))
 941                 goto out;
 942
 943         if (info.exists)
 944                 event = info.event_nr;
 945
 946 out:
 947         dm_task_destroy(dmt);
 948
 949         return event;
 950 }
 951
 952 char *
 953 dm_mapname(int major, int minor)
 954 {
 955         char * response = NULL;
 956         const char *map;
 957         struct dm_task *dmt;
 958         int r;
 959         int loop = MAX_WAIT * LOOPS_PER_SEC;
 960
 961         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 962                 return NULL;
 963
 964         if (!dm_task_set_major(dmt, major) ||
 965             !dm_task_set_minor(dmt, minor))
 966                 goto bad;
 967
 968         dm_task_no_open_count(dmt);
 969
 970         /*
 971          * device map might not be ready when we get here from
 972          * daemon uev_trigger -> uev_add_map
 973          */
 974         while (--loop) {
 975                 r = dm_task_run(dmt);
 976
 977                 if (r)
 978                         break;
 979
 980                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 981         }
 982
 983         if (!r) {
 984                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 985                 goto bad;
 986         }
 987
 988         map = dm_task_get_name(dmt);
 989         if (map && strlen(map))
 990                 response = STRDUP((char *)dm_task_get_name(dmt));
 991
 992         dm_task_destroy(dmt);
 993         return response;
 994 bad:
 995         dm_task_destroy(dmt);
 996         condlog(0, "%i:%i: error fetching map name", major, minor);
 997         return NULL;
 998 }
 999
1000 int
1001 dm_remove_partmaps (const char * mapname, int need_sync)
1002 {
1003         struct dm_task *dmt;
1004         struct dm_names *names;
1005         unsigned next = 0;
1006         char params[PARAMS_SIZE];
1007         unsigned long long size;
1008         char dev_t[32];
1009         int r = 1;
1010
1011         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1012                 return 1;
1013
1014         dm_task_no_open_count(dmt);
1015
1016         if (!dm_task_run(dmt))
1017                 goto out;
1018
1019         if (!(names = dm_task_get_names(dmt)))
1020                 goto out;
1021
1022         if (!names->dev) {
1023                 r = 0; /* this is perfectly valid */
1024                 goto out;
1025         }
1026
1027         if (dm_dev_t(mapname, &dev_t[0], 32))
1028                 goto out;
1029
1030         do {
1031                 if (
1032                     /*
1033                      * if devmap target is "linear"
1034                      */
1035                     (dm_type(names->name, TGT_PART) > 0) &&
1036
1037                     /*
1038                      * and both uuid end with same suffix starting
1039                      * at UUID_PREFIX
1040                      */
1041                     (!dm_compare_uuid(names->name, mapname)) &&
1042
1043                     /*
1044                      * and we can fetch the map table from the kernel
1045                      */
1046                     !dm_get_map(names->name, &size, &params[0]) &&
1047
1048                     /*
1049                      * and the table maps over the multipath map
1050                      */
1051                     strstr(params, dev_t)
1052                    ) {
1053                         /*
1054                          * then it's a kpartx generated partition.
1055                          * remove it.
1056                          */
1057                         /*
1058                          * if the opencount is 0 maybe some other
1059                          * partitions depend on it.
1060                          */
1061                         if (dm_get_opencount(names->name)) {
1062                                 dm_remove_partmaps(names->name, need_sync);
1063                                 if (dm_get_opencount(names->name)) {
1064                                         condlog(2, "%s: map in use",
1065                                                 names->name);
1066                                         goto out;
1067                                 }
1068                         }
1069                         condlog(4, "partition map %s removed",
1070                                 names->name);
1071                         dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name,
1072                                            need_sync);
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 static struct dm_info *
1086 alloc_dminfo (void)
1087 {
1088         return MALLOC(sizeof(struct dm_info));
1089 }
1090
1091 int
1092 dm_get_info (char * mapname, struct dm_info ** dmi)
1093 {
1094         int r = 1;
1095         struct dm_task *dmt = NULL;
1096
1097         if (!mapname)
1098                 return 1;
1099
1100         if (!*dmi)
1101                 *dmi = alloc_dminfo();
1102
1103         if (!*dmi)
1104                 return 1;
1105
1106         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
1107                 goto out;
1108
1109         if (!dm_task_set_name(dmt, mapname))
1110                 goto out;
1111
1112         dm_task_no_open_count(dmt);
1113
1114         if (!dm_task_run(dmt))
1115                 goto out;
1116
1117         if (!dm_task_get_info(dmt, *dmi))
1118                 goto out;
1119
1120         r = 0;
1121 out:
1122         if (r) {
1123                 memset(*dmi, 0, sizeof(struct dm_info));
1124                 FREE(*dmi);
1125                 *dmi = NULL;
1126         }
1127
1128         if (dmt)
1129                 dm_task_destroy(dmt);
1130
1131         return r;
1132 }
1133
1134 int
1135 dm_rename_partmaps (char * old, char * new)
1136 {
1137         struct dm_task *dmt;
1138         struct dm_names *names;
1139         unsigned next = 0;
1140         char buff[PARAMS_SIZE];
1141         unsigned long long size;
1142         char dev_t[32];
1143         int r = 1;
1144
1145         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1146                 return 1;
1147
1148         dm_task_no_open_count(dmt);
1149
1150         if (!dm_task_run(dmt))
1151                 goto out;
1152
1153         if (!(names = dm_task_get_names(dmt)))
1154                 goto out;
1155
1156         if (!names->dev) {
1157                 r = 0; /* this is perfectly valid */
1158                 goto out;
1159         }
1160
1161         if (dm_dev_t(old, &dev_t[0], 32))
1162                 goto out;
1163
1164         do {
1165                 if (
1166                     /*
1167                      * if devmap target is "linear"
1168                      */
1169                     (dm_type(names->name, TGT_PART) > 0) &&
1170
1171                     /*
1172                      * and the multipath mapname and the part mapname start
1173                      * the same
1174                      */
1175                     !strncmp(names->name, old, strlen(old)) &&
1176
1177                     /*
1178                      * and we can fetch the map table from the kernel
1179                      */
1180                     !dm_get_map(names->name, &size, &buff[0]) &&
1181
1182                     /*
1183                      * and the table maps over the multipath map
1184                      */
1185                     strstr(buff, dev_t)
1186                    ) {
1187                                 /*
1188                                  * then it's a kpartx generated partition.
1189                                  * Rename it.
1190                                  */
1191                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1192                                          new, names->name + strlen(old));
1193                                 dm_rename(names->name, buff);
1194                                 condlog(4, "partition map %s renamed",
1195                                         names->name);
1196                    }
1197
1198                 next = names->next;
1199                 names = (void *) names + next;
1200         } while (next);
1201
1202         r = 0;
1203 out:
1204         dm_task_destroy (dmt);
1205         return r;
1206 }
1207
1208 int
1209 dm_rename (char * old, char * new)
1210 {
1211         int r = 0;
1212         struct dm_task *dmt;
1213
1214         if (dm_rename_partmaps(old, new))
1215                 return r;
1216
1217         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1218                 return r;
1219
1220         if (!dm_task_set_name(dmt, old))
1221                 goto out;
1222
1223         if (!dm_task_set_newname(dmt, new))
1224                 goto out;
1225
1226         dm_task_no_open_count(dmt);
1227
1228         if (!dm_task_set_cookie(dmt, &conf->cookie, (conf->daemon)? DM_UDEV_DISABLE_LIBRARY_FALLBACK : 0))
1229                 goto out;
1230         if (!dm_task_run(dmt))
1231                 goto out;
1232
1233         r = 1;
1234 out:
1235         dm_task_destroy(dmt);
1236         return r;
1237 }
1238
1239 void dm_reassign_deps(char *table, char *dep, char *newdep)
1240 {
1241         char *p, *n;
1242         char newtable[PARAMS_SIZE];
1243
1244         strcpy(newtable, table);
1245         p = strstr(newtable, dep);
1246         n = table + (p - newtable);
1247         strcpy(n, newdep);
1248         n += strlen(newdep);
1249         p += strlen(dep);
1250         strcat(n, p);
1251 }
1252
1253 int dm_reassign_table(const char *name, char *old, char *new)
1254 {
1255         int r, modified = 0;
1256         uint64_t start, length;
1257         struct dm_task *dmt, *reload_dmt;
1258         char *target, *params = NULL;
1259         char buff[PARAMS_SIZE];
1260         void *next = NULL;
1261
1262         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
1263                 return 0;
1264
1265         if (!dm_task_set_name(dmt, name))
1266                 goto out;
1267
1268         dm_task_no_open_count(dmt);
1269
1270         if (!dm_task_run(dmt))
1271                 goto out;
1272         if (!(reload_dmt = dm_task_create(DM_DEVICE_RELOAD)))
1273                 goto out;
1274         if (!dm_task_set_name(reload_dmt, name))
1275                 goto out_reload;
1276
1277         do {
1278                 next = dm_get_next_target(dmt, next, &start, &length,
1279                                           &target, &params);
1280                 memset(buff, 0, PARAMS_SIZE);
1281                 strcpy(buff, params);
1282                 if (strcmp(target, TGT_MPATH) && strstr(params, old)) {
1283                         condlog(3, "%s: replace target %s %s",
1284                                 name, target, buff);
1285                         dm_reassign_deps(buff, old, new);
1286                         condlog(3, "%s: with target %s %s",
1287                                 name, target, buff);
1288                         modified++;
1289                 }
1290                 dm_task_add_target(reload_dmt, start, length, target, buff);
1291         } while (next);
1292
1293         if (modified) {
1294                 dm_task_no_open_count(reload_dmt);
1295
1296                 if (!dm_task_run(reload_dmt)) {
1297                         condlog(3, "%s: failed to reassign targets", name);
1298                         goto out_reload;
1299                 }
1300                 dm_simplecmd_noflush(DM_DEVICE_RESUME, name);
1301         }
1302         r = 1;
1303
1304 out_reload:
1305         dm_task_destroy(reload_dmt);
1306 out:
1307         dm_task_destroy(dmt);
1308         return r;
1309 }
1310
1311
1312 /*
1313  * Reassign existing device-mapper table(s) to not use
1314  * the block devices but point to the multipathed
1315  * device instead
1316  */
1317 int dm_reassign(const char *mapname)
1318 {
1319         struct dm_deps *deps;
1320         struct dm_task *dmt;
1321         struct dm_info info;
1322         char dev_t[32], dm_dep[32];
1323         int r = 0, i;
1324
1325         if (dm_dev_t(mapname, &dev_t[0], 32)) {
1326                 condlog(3, "%s: failed to get device number", mapname);
1327                 return 1;
1328         }
1329
1330         if (!(dmt = dm_task_create(DM_DEVICE_DEPS))) {
1331                 condlog(3, "%s: couldn't make dm task", mapname);
1332                 return 0;
1333         }
1334
1335         if (!dm_task_set_name(dmt, mapname))
1336                 goto out;
1337
1338         dm_task_no_open_count(dmt);
1339
1340         if (!dm_task_run(dmt))
1341                 goto out;
1342
1343         if (!dm_task_get_info(dmt, &info))
1344                 goto out;
1345
1346         if (!(deps = dm_task_get_deps(dmt)))
1347                 goto out;
1348
1349         if (!info.exists)
1350                 goto out;
1351
1352         for (i = 0; i < deps->count; i++) {
1353                 sprintf(dm_dep, "%d:%d",
1354                         major(deps->device[i]),
1355                         minor(deps->device[i]));
1356                 sysfs_check_holders(dm_dep, dev_t);
1357         }
1358
1359         dm_task_destroy (dmt);
1360
1361         r = 1;
1362 out:
1363         return r;
1364 }
1365
1366 int dm_setgeometry(struct multipath *mpp)
1367 {
1368         struct dm_task *dmt;
1369         struct path *pp;
1370         char heads[4], sectors[4];
1371         char cylinders[10], start[32];
1372         int r = 0;
1373
1374         if (!mpp)
1375                 return 1;
1376
1377         pp = first_path(mpp);
1378         if (!pp) {
1379                 condlog(3, "%s: no path for geometry", mpp->alias);
1380                 return 1;
1381         }
1382         if (pp->geom.cylinders == 0 ||
1383             pp->geom.heads == 0 ||
1384             pp->geom.sectors == 0) {
1385                 condlog(3, "%s: invalid geometry on %s", mpp->alias, pp->dev);
1386                 return 1;
1387         }
1388
1389         if (!(dmt = dm_task_create(DM_DEVICE_SET_GEOMETRY)))
1390                 return 0;
1391
1392         if (!dm_task_set_name(dmt, mpp->alias))
1393                 goto out;
1394
1395         dm_task_no_open_count(dmt);
1396
1397         /* What a sick interface ... */
1398         snprintf(heads, 4, "%u", pp->geom.heads);
1399         snprintf(sectors, 4, "%u", pp->geom.sectors);
1400         snprintf(cylinders, 10, "%u", pp->geom.cylinders);
1401         snprintf(start, 32, "%lu", pp->geom.start);
1402         if (!dm_task_set_geometry(dmt, cylinders, heads, sectors, start)) {
1403                 condlog(3, "%s: Failed to set geometry", mpp->alias);
1404                 goto out;
1405         }
1406
1407         r = dm_task_run(dmt);
1408 out:
1409         dm_task_destroy(dmt);
1410
1411         return r;
1412 }