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 #ifndef LIBDM_API_COOKIE
  35 static inline int dm_task_set_cookie(struct dm_task *dmt, uint32_t *c, int a)
  36 {
  37         return 1;
  38 }
  39
  40 void udev_wait(unsigned int c)
  41 {
  42 }
  43
  44 void udev_set_sync_support(int c)
  45 {
  46 }
  47 #else
  48 void udev_wait(unsigned int c)
  49 {
  50         dm_udev_wait(c);
  51 }
  52
  53 void udev_set_sync_support(int c)
  54 {
  55         dm_udev_set_sync_support(c);
  56 }
  57 #endif
  58
  59 static void
  60 dm_write_log (int level, const char *file, int line, const char *f, ...)
  61 {
  62         va_list ap;
  63         int thres;
  64
  65         if (level > 6)
  66                 level = 6;
  67
  68         thres = (conf) ? conf->verbosity : 0;
  69         if (thres <= 3 || level > thres)
  70                 return;
  71
  72         va_start(ap, f);
  73         if (!logsink) {
  74                 time_t t = time(NULL);
  75                 struct tm *tb = localtime(&t);
  76                 char buff[16];
  77
  78                 strftime(buff, sizeof(buff), "%b %d %H:%M:%S", tb);
  79                 buff[sizeof(buff)-1] = '\0';
  80
  81                 fprintf(stdout, "%s | ", buff);
  82                 fprintf(stdout, "libdevmapper: %s(%i): ", file, line);
  83                 vfprintf(stdout, f, ap);
  84                 fprintf(stdout, "\n");
  85         } else {
  86                 condlog(level, "libdevmapper: %s(%i): ", file, line);
  87                 log_safe(level + 3, f, ap);
  88         }
  89         va_end(ap);
  90
  91         return;
  92 }
  93
  94 extern void
  95 dm_init(void) {
  96         dm_log_init(&dm_write_log);
  97         dm_log_init_verbose(conf ? conf->verbosity + 3 : 0);
  98 }
  99
 100 #define VERSION_GE(v, minv) ( \
 101  (v[0] > minv[0]) || \
 102  ((v[0] == minv[0]) && (v[1] > minv[1])) || \
 103  ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2])) \
 104 )
 105
 106 static int
 107 dm_lib_prereq (void)
 108 {
 109         char version[64];
 110         int v[3];
 111 #ifdef LIBDM_API_COOKIE
 112         int minv[3] = {1, 2, 38};
 113 #else
 114         int minv[3] = {1, 2, 8};
 115 #endif
 116
 117         dm_get_library_version(version, sizeof(version));
 118         condlog(3, "libdevmapper version %s", version);
 119         sscanf(version, "%d.%d.%d ", &v[0], &v[1], &v[2]);
 120
 121         if VERSION_GE(v, minv)
 122                 return 0;
 123         condlog(0, "libdevmapper version must be >= %d.%.2d.%.2d",
 124                 minv[0], minv[1], minv[2]);
 125         return 1;
 126 }
 127
 128 static int
 129 dm_drv_version (unsigned int * version, char * str)
 130 {
 131         int r = 2;
 132         struct dm_task *dmt;
 133         struct dm_versions *target;
 134         struct dm_versions *last_target;
 135         unsigned int *v;
 136
 137         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 138                 return 1;
 139
 140         dm_task_no_open_count(dmt);
 141
 142         if (!dm_task_run(dmt)) {
 143                 condlog(0, "Can not communicate with kernel DM");
 144                 goto out;
 145         }
 146         target = dm_task_get_versions(dmt);
 147
 148         do {
 149                 last_target = target;
 150                 if (!strncmp(str, target->name, strlen(str))) {
 151                         r = 1;
 152                         break;
 153                 }
 154                 target = (void *) target + target->next;
 155         } while (last_target != target);
 156
 157         if (r == 2) {
 158                 condlog(0, "DM %s kernel driver not loaded", str);
 159                 goto out;
 160         }
 161         v = target->version;
 162         version[0] = v[0];
 163         version[1] = v[1];
 164         version[2] = v[2];
 165         r = 0;
 166 out:
 167         dm_task_destroy(dmt);
 168         return r;
 169 }
 170
 171 int
 172 dm_drv_get_rq (void)
 173 {
 174         unsigned int minv_dmrq[3] = {1, 1, 0};
 175         unsigned int version[3] = {0, 0, 0};
 176         unsigned int * v = version;
 177
 178         if (dm_drv_version(v, TGT_MPATH)) {
 179                 /* in doubt return least capable */
 180                 return 0;
 181         }
 182
 183         /* test request based multipath capability */
 184         if VERSION_GE(v, minv_dmrq) {
 185                 condlog(3, "activate request-based multipathing mode "
 186                            "(driver >= v%u.%u.%u)",
 187                         minv_dmrq[0], minv_dmrq[1], minv_dmrq[2]);
 188                 return 1;
 189         }
 190         return 0;
 191 }
 192
 193 static int
 194 dm_drv_prereq (void)
 195 {
 196         unsigned int minv[3] = {1, 0, 3};
 197         unsigned int version[3] = {0, 0, 0};
 198         unsigned int * v = version;
 199
 200         if (dm_drv_version(v, TGT_MPATH)) {
 201                 /* in doubt return not capable */
 202                 return 1;
 203         }
 204
 205         /* test request based multipath capability */
 206         condlog(3, "DM multipath kernel driver v%u.%u.%u",
 207                 v[0], v[1], v[2]);
 208
 209         if VERSION_GE(v, minv)
 210                 return 0;
 211
 212         condlog(0, "DM multipath kernel driver must be >= v%u.%u.%u",
 213                 minv[0], minv[1], minv[2]);
 214         return 1;
 215 }
 216
 217 extern int
 218 dm_prereq (void)
 219 {
 220         if (dm_lib_prereq())
 221                 return 1;
 222         return dm_drv_prereq();
 223 }
 224
 225 static int
 226 dm_simplecmd (int task, const char *name, int no_flush, int need_sync) {
 227         int r = 0;
 228         int udev_wait_flag = (need_sync && (task == DM_DEVICE_RESUME ||
 229                                             task == DM_DEVICE_REMOVE));
 230         struct dm_task *dmt;
 231
 232         if (!(dmt = dm_task_create (task)))
 233                 return 0;
 234
 235         if (!dm_task_set_name (dmt, name))
 236                 goto out;
 237
 238         dm_task_no_open_count(dmt);
 239         dm_task_skip_lockfs(dmt);       /* for DM_DEVICE_RESUME */
 240 #ifdef LIBDM_API_FLUSH
 241         if (no_flush)
 242                 dm_task_no_flush(dmt);          /* for DM_DEVICE_SUSPEND/RESUME */
 243 #endif
 244
 245         if (udev_wait_flag && !dm_task_set_cookie(dmt, &conf->cookie, 0))
 246                 goto out;
 247         r = dm_task_run (dmt);
 248
 249         out:
 250         dm_task_destroy (dmt);
 251         return r;
 252 }
 253
 254 extern int
 255 dm_simplecmd_flush (int task, const char *name, int needsync) {
 256         return dm_simplecmd(task, name, 0, needsync);
 257 }
 258
 259 extern int
 260 dm_simplecmd_noflush (int task, const char *name) {
 261         return dm_simplecmd(task, name, 1, 1);
 262 }
 263
 264 extern int
 265 dm_addmap (int task, const char *target, struct multipath *mpp, char * params,
 266            int use_uuid, int ro) {
 267         int r = 0;
 268         struct dm_task *dmt;
 269         char *prefixed_uuid = NULL;
 270
 271         if (!(dmt = dm_task_create (task)))
 272                 return 0;
 273
 274         if (!dm_task_set_name (dmt, mpp->alias))
 275                 goto addout;
 276
 277         if (!dm_task_add_target (dmt, 0, mpp->size, target, params))
 278                 goto addout;
 279
 280         if (ro)
 281                 dm_task_set_ro(dmt);
 282
 283         if (use_uuid && mpp->wwid){
 284                 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(mpp->wwid) + 1);
 285                 if (!prefixed_uuid) {
 286                         condlog(0, "cannot create prefixed uuid : %s\n",
 287                                 strerror(errno));
 288                         goto addout;
 289                 }
 290                 sprintf(prefixed_uuid, UUID_PREFIX "%s", mpp->wwid);
 291                 if (!dm_task_set_uuid(dmt, prefixed_uuid))
 292                         goto freeout;
 293         }
 294
 295         if (mpp->attribute_flags & (1 << ATTR_MODE) &&
 296             !dm_task_set_mode(dmt, mpp->mode))
 297                 goto freeout;
 298         if (mpp->attribute_flags & (1 << ATTR_UID) &&
 299             !dm_task_set_uid(dmt, mpp->uid))
 300                 goto freeout;
 301         if (mpp->attribute_flags & (1 << ATTR_GID) &&
 302             !dm_task_set_gid(dmt, mpp->gid))
 303                 goto freeout;
 304         condlog(4, "%s: addmap [0 %llu %s %s]\n", mpp->alias, mpp->size,
 305                 target, params);
 306
 307         dm_task_no_open_count(dmt);
 308
 309         if (task == DM_DEVICE_CREATE &&
 310             !dm_task_set_cookie(dmt, &conf->cookie, 0))
 311                 goto freeout;
 312         r = dm_task_run (dmt);
 313
 314         freeout:
 315         if (prefixed_uuid)
 316                 FREE(prefixed_uuid);
 317
 318         addout:
 319         dm_task_destroy (dmt);
 320
 321         return r;
 322 }
 323
 324 static int
 325 _dm_addmap_create (struct multipath *mpp, char * params, int ro) {
 326         int r;
 327         r = dm_addmap(DM_DEVICE_CREATE, TGT_MPATH, mpp, params, 1, ro);
 328         /*
 329          * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
 330          * Failing the second part leaves an empty map. Clean it up.
 331          */
 332         if (!r && dm_map_present(mpp->alias)) {
 333                 condlog(3, "%s: failed to load map (a path might be in use)",
 334                         mpp->alias);
 335                 dm_flush_map_nosync(mpp->alias);
 336         }
 337         return r;
 338 }
 339
 340 #define ADDMAP_RW 0
 341 #define ADDMAP_RO 1
 342
 343 extern int
 344 dm_addmap_create (struct multipath *mpp, char *params) {
 345         return _dm_addmap_create(mpp, params, ADDMAP_RW);
 346 }
 347
 348 extern int
 349 dm_addmap_create_ro (struct multipath *mpp, char *params) {
 350         return _dm_addmap_create(mpp, params, ADDMAP_RO);
 351 }
 352
 353 extern int
 354 dm_addmap_reload (struct multipath *mpp, char *params) {
 355         return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, params, 0, ADDMAP_RW);
 356 }
 357
 358 extern int
 359 dm_addmap_reload_ro (struct multipath *mpp, char *params) {
 360         return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, params, 0, ADDMAP_RO);
 361 }
 362
 363 extern int
 364 dm_map_present (const char * str)
 365 {
 366         int r = 0;
 367         struct dm_task *dmt;
 368         struct dm_info info;
 369
 370         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 371                 return 0;
 372
 373         if (!dm_task_set_name(dmt, str))
 374                 goto out;
 375
 376         dm_task_no_open_count(dmt);
 377
 378         if (!dm_task_run(dmt))
 379                 goto out;
 380
 381         if (!dm_task_get_info(dmt, &info))
 382                 goto out;
 383
 384         if (info.exists)
 385                 r = 1;
 386 out:
 387         dm_task_destroy(dmt);
 388         return r;
 389 }
 390
 391 extern int
 392 dm_get_map(char * name, unsigned long long * size, char * outparams)
 393 {
 394         int r = 1;
 395         struct dm_task *dmt;
 396         void *next = NULL;
 397         uint64_t start, length;
 398         char *target_type = NULL;
 399         char *params = NULL;
 400
 401         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 402                 return 1;
 403
 404         if (!dm_task_set_name(dmt, name))
 405                 goto out;
 406
 407         dm_task_no_open_count(dmt);
 408
 409         if (!dm_task_run(dmt))
 410                 goto out;
 411
 412         /* Fetch 1st target */
 413         next = dm_get_next_target(dmt, next, &start, &length,
 414                                   &target_type, &params);
 415
 416         if (size)
 417                 *size = length;
 418
 419         if (!outparams) {
 420                 r = 0;
 421                 goto out;
 422         }
 423         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 424                 r = 0;
 425 out:
 426         dm_task_destroy(dmt);
 427         return r;
 428 }
 429
 430 static int
 431 dm_get_prefixed_uuid(const char *name, char *uuid)
 432 {
 433         struct dm_task *dmt;
 434         const char *uuidtmp;
 435         int r = 1;
 436
 437         dmt = dm_task_create(DM_DEVICE_INFO);
 438         if (!dmt)
 439                 return 1;
 440
 441         if (!dm_task_set_name (dmt, name))
 442                 goto uuidout;
 443
 444         if (!dm_task_run(dmt))
 445                 goto uuidout;
 446
 447         uuidtmp = dm_task_get_uuid(dmt);
 448         if (uuidtmp)
 449                 strcpy(uuid, uuidtmp);
 450         else
 451                 uuid[0] = '\0';
 452
 453         r = 0;
 454 uuidout:
 455         dm_task_destroy(dmt);
 456         return r;
 457 }
 458
 459 extern int
 460 dm_get_uuid(char *name, char *uuid)
 461 {
 462         char uuidtmp[WWID_SIZE];
 463
 464         if (dm_get_prefixed_uuid(name, uuidtmp))
 465                 return 1;
 466
 467         if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
 468                 strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
 469         else
 470                 strcpy(uuid, uuidtmp);
 471
 472         return 0;
 473 }
 474
 475 /*
 476  * returns:
 477  *    0 : if both uuids end with same suffix which starts with UUID_PREFIX
 478  *    1 : otherwise
 479  */
 480 int
 481 dm_compare_uuid(const char* mapname1, const char* mapname2)
 482 {
 483         char *p1, *p2;
 484         char uuid1[WWID_SIZE], uuid2[WWID_SIZE];
 485
 486         if (dm_get_prefixed_uuid(mapname1, uuid1))
 487                 return 1;
 488
 489         if (dm_get_prefixed_uuid(mapname2, uuid2))
 490                 return 1;
 491
 492         p1 = strstr(uuid1, UUID_PREFIX);
 493         p2 = strstr(uuid2, UUID_PREFIX);
 494         if (p1 && p2 && !strcmp(p1, p2))
 495                 return 0;
 496
 497         return 1;
 498 }
 499
 500 extern int
 501 dm_get_status(char * name, char * outstatus)
 502 {
 503         int r = 1;
 504         struct dm_task *dmt;
 505         void *next = NULL;
 506         uint64_t start, length;
 507         char *target_type;
 508         char *status;
 509
 510         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 511                 return 1;
 512
 513         if (!dm_task_set_name(dmt, name))
 514                 goto out;
 515
 516         dm_task_no_open_count(dmt);
 517
 518         if (!dm_task_run(dmt))
 519                 goto out;
 520
 521         /* Fetch 1st target */
 522         next = dm_get_next_target(dmt, next, &start, &length,
 523                                   &target_type, &status);
 524
 525         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 526                 r = 0;
 527 out:
 528         if (r)
 529                 condlog(0, "%s: error getting map status string", name);
 530
 531         dm_task_destroy(dmt);
 532         return r;
 533 }
 534
 535 /*
 536  * returns:
 537  *    1 : match
 538  *    0 : no match
 539  *   -1 : empty map
 540  */
 541 extern int
 542 dm_type(const char * name, char * type)
 543 {
 544         int r = 0;
 545         struct dm_task *dmt;
 546         void *next = NULL;
 547         uint64_t start, length;
 548         char *target_type = NULL;
 549         char *params;
 550
 551         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 552                 return 0;
 553
 554         if (!dm_task_set_name(dmt, name))
 555                 goto out;
 556
 557         dm_task_no_open_count(dmt);
 558
 559         if (!dm_task_run(dmt))
 560                 goto out;
 561
 562         /* Fetch 1st target */
 563         next = dm_get_next_target(dmt, next, &start, &length,
 564                                   &target_type, &params);
 565
 566         if (!target_type)
 567                 r = -1;
 568         else if (!strcmp(target_type, type))
 569                 r = 1;
 570
 571 out:
 572         dm_task_destroy(dmt);
 573         return r;
 574 }
 575
 576 static int
 577 dm_dev_t (const char * mapname, char * dev_t, int len)
 578 {
 579         int r = 1;
 580         struct dm_task *dmt;
 581         struct dm_info info;
 582
 583         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 584                 return 0;
 585
 586         if (!dm_task_set_name(dmt, mapname))
 587                 goto out;
 588
 589         if (!dm_task_run(dmt))
 590                 goto out;
 591
 592         if (!dm_task_get_info(dmt, &info))
 593                 goto out;
 594
 595         r = info.open_count;
 596         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 597                     goto out;
 598
 599         r = 0;
 600 out:
 601         dm_task_destroy(dmt);
 602         return r;
 603 }
 604
 605 int
 606 dm_get_opencount (const char * mapname)
 607 {
 608         int r = -1;
 609         struct dm_task *dmt;
 610         struct dm_info info;
 611
 612         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 613                 return 0;
 614
 615         if (!dm_task_set_name(dmt, mapname))
 616                 goto out;
 617
 618         if (!dm_task_run(dmt))
 619                 goto out;
 620
 621         if (!dm_task_get_info(dmt, &info))
 622                 goto out;
 623
 624         r = info.open_count;
 625 out:
 626         dm_task_destroy(dmt);
 627         return r;
 628 }
 629
 630 int
 631 dm_get_minor (char * mapname)
 632 {
 633         int r = -1;
 634         struct dm_task *dmt;
 635         struct dm_info info;
 636
 637         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 638                 return 0;
 639
 640         if (!dm_task_set_name(dmt, mapname))
 641                 goto out;
 642
 643         if (!dm_task_run(dmt))
 644                 goto out;
 645
 646         if (!dm_task_get_info(dmt, &info))
 647                 goto out;
 648
 649         r = info.minor;
 650 out:
 651         dm_task_destroy(dmt);
 652         return r;
 653 }
 654
 655 extern int
 656 _dm_flush_map (const char * mapname, int need_sync)
 657 {
 658         int r;
 659
 660         if (!dm_map_present(mapname))
 661                 return 0;
 662
 663         if (dm_type(mapname, TGT_MPATH) <= 0)
 664                 return 0; /* nothing to do */
 665
 666         if (dm_remove_partmaps(mapname, need_sync))
 667                 return 1;
 668
 669         if (dm_get_opencount(mapname)) {
 670                 condlog(2, "%s: map in use", mapname);
 671                 return 1;
 672         }
 673
 674         r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname, need_sync);
 675
 676         if (r) {
 677                 condlog(4, "multipath map %s removed", mapname);
 678                 return 0;
 679         }
 680         return 1;
 681 }
 682
 683 extern int
 684 dm_flush_maps (void)
 685 {
 686         int r = 0;
 687         struct dm_task *dmt;
 688         struct dm_names *names;
 689         unsigned next = 0;
 690
 691         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 692                 return 0;
 693
 694         dm_task_no_open_count(dmt);
 695
 696         if (!dm_task_run (dmt))
 697                 goto out;
 698
 699         if (!(names = dm_task_get_names (dmt)))
 700                 goto out;
 701
 702         if (!names->dev)
 703                 goto out;
 704
 705         do {
 706                 r |= dm_flush_map(names->name);
 707                 next = names->next;
 708                 names = (void *) names + next;
 709         } while (next);
 710
 711         out:
 712         dm_task_destroy (dmt);
 713         return r;
 714 }
 715
 716 int
 717 dm_message(char * mapname, char * message)
 718 {
 719         int r = 1;
 720         struct dm_task *dmt;
 721
 722         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 723                 return 1;
 724
 725         if (!dm_task_set_name(dmt, mapname))
 726                 goto out;
 727
 728         if (!dm_task_set_sector(dmt, 0))
 729                 goto out;
 730
 731         if (!dm_task_set_message(dmt, message))
 732                 goto out;
 733
 734         dm_task_no_open_count(dmt);
 735
 736         if (!dm_task_run(dmt))
 737                 goto out;
 738
 739         r = 0;
 740 out:
 741         if (r)
 742                 condlog(0, "DM message failed [%s]", message);
 743
 744         dm_task_destroy(dmt);
 745         return r;
 746 }
 747
 748 int
 749 dm_fail_path(char * mapname, char * path)
 750 {
 751         char message[32];
 752
 753         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 754                 return 1;
 755
 756         return dm_message(mapname, message);
 757 }
 758
 759 int
 760 dm_reinstate_path(char * mapname, char * path)
 761 {
 762         char message[32];
 763
 764         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 765                 return 1;
 766
 767         return dm_message(mapname, message);
 768 }
 769
 770 int
 771 dm_queue_if_no_path(char *mapname, int enable)
 772 {
 773         char *message;
 774
 775         if (enable)
 776                 message = "queue_if_no_path\n";
 777         else
 778                 message = "fail_if_no_path\n";
 779
 780         return dm_message(mapname, message);
 781 }
 782
 783 int
 784 dm_set_pg_timeout(char *mapname, int timeout_val)
 785 {
 786         char message[24];
 787
 788         if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
 789                 return 1;
 790         return dm_message(mapname, message);
 791 }
 792
 793 static int
 794 dm_groupmsg (char * msg, char * mapname, int index)
 795 {
 796         char message[32];
 797
 798         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 799                 return 1;
 800
 801         return dm_message(mapname, message);
 802 }
 803
 804 int
 805 dm_switchgroup(char * mapname, int index)
 806 {
 807         return dm_groupmsg("switch", mapname, index);
 808 }
 809
 810 int
 811 dm_enablegroup(char * mapname, int index)
 812 {
 813         return dm_groupmsg("enable", mapname, index);
 814 }
 815
 816 int
 817 dm_disablegroup(char * mapname, int index)
 818 {
 819         return dm_groupmsg("disable", mapname, index);
 820 }
 821
 822 int
 823 dm_get_maps (vector mp)
 824 {
 825         struct multipath * mpp;
 826         int r = 1;
 827         int info;
 828         struct dm_task *dmt;
 829         struct dm_names *names;
 830         unsigned next = 0;
 831
 832         if (!mp)
 833                 return 1;
 834
 835         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 836                 return 1;
 837
 838         dm_task_no_open_count(dmt);
 839
 840         if (!dm_task_run(dmt))
 841                 goto out;
 842
 843         if (!(names = dm_task_get_names(dmt)))
 844                 goto out;
 845
 846         if (!names->dev) {
 847                 r = 0; /* this is perfectly valid */
 848                 goto out;
 849         }
 850
 851         do {
 852                 info = dm_type(names->name, TGT_MPATH);
 853
 854                 if (info <= 0)
 855                         goto next;
 856
 857                 mpp = alloc_multipath();
 858
 859                 if (!mpp)
 860                         goto out;
 861
 862                 mpp->alias = STRDUP(names->name);
 863
 864                 if (!mpp->alias)
 865                         goto out1;
 866
 867                 if (info > 0) {
 868                         if (dm_get_map(names->name, &mpp->size, NULL))
 869                                 goto out1;
 870
 871                         dm_get_uuid(names->name, mpp->wwid);
 872                         dm_get_info(names->name, &mpp->dmi);
 873                 }
 874
 875                 if (!vector_alloc_slot(mp))
 876                         goto out1;
 877
 878                 vector_set_slot(mp, mpp);
 879                 mpp = NULL;
 880 next:
 881                 next = names->next;
 882                 names = (void *) names + next;
 883         } while (next);
 884
 885         r = 0;
 886         goto out;
 887 out1:
 888         free_multipath(mpp, KEEP_PATHS);
 889 out:
 890         dm_task_destroy (dmt);
 891         return r;
 892 }
 893
 894 extern char *
 895 dm_get_name(char *uuid)
 896 {
 897         struct dm_task *dmt;
 898         struct dm_info info;
 899         char *prefixed_uuid, *name = NULL;
 900         const char *nametmp;
 901
 902         dmt = dm_task_create(DM_DEVICE_INFO);
 903         if (!dmt)
 904                 return NULL;
 905
 906         prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
 907         if (!prefixed_uuid) {
 908                 condlog(0, "cannot create prefixed uuid : %s\n",
 909                         strerror(errno));
 910                 goto freeout;
 911         }
 912         sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
 913         if (!dm_task_set_uuid(dmt, prefixed_uuid))
 914                 goto freeout;
 915
 916         if (!dm_task_run(dmt))
 917                 goto freeout;
 918
 919         if (!dm_task_get_info(dmt, &info) || !info.exists)
 920                 goto freeout;
 921
 922         nametmp = dm_task_get_name(dmt);
 923         if (nametmp && strlen(nametmp)) {
 924                 name = MALLOC(strlen(nametmp) + 1);
 925                 if (name)
 926                         strcpy(name, nametmp);
 927         } else {
 928                 condlog(2, "%s: no device-mapper name found", uuid);
 929         }
 930
 931 freeout:
 932         if (prefixed_uuid)
 933                 FREE(prefixed_uuid);
 934         dm_task_destroy(dmt);
 935
 936         return name;
 937 }
 938
 939 int
 940 dm_geteventnr (char *name)
 941 {
 942         struct dm_task *dmt;
 943         struct dm_info info;
 944
 945         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 946                 return 0;
 947
 948         if (!dm_task_set_name(dmt, name))
 949                 goto out;
 950
 951         dm_task_no_open_count(dmt);
 952
 953         if (!dm_task_run(dmt))
 954                 goto out;
 955
 956         if (!dm_task_get_info(dmt, &info)) {
 957                 info.event_nr = 0;
 958                 goto out;
 959         }
 960
 961         if (!info.exists) {
 962                 info.event_nr = 0;
 963                 goto out;
 964         }
 965
 966 out:
 967         dm_task_destroy(dmt);
 968
 969         return info.event_nr;
 970 }
 971
 972 char *
 973 dm_mapname(int major, int minor)
 974 {
 975         char * response = NULL;
 976         const char *map;
 977         struct dm_task *dmt;
 978         int r;
 979         int loop = MAX_WAIT * LOOPS_PER_SEC;
 980
 981         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 982                 return NULL;
 983
 984         if (!dm_task_set_major(dmt, major) ||
 985             !dm_task_set_minor(dmt, minor))
 986                 goto bad;
 987
 988         dm_task_no_open_count(dmt);
 989
 990         /*
 991          * device map might not be ready when we get here from
 992          * daemon uev_trigger -> uev_add_map
 993          */
 994         while (--loop) {
 995                 r = dm_task_run(dmt);
 996
 997                 if (r)
 998                         break;
 999
1000                 usleep(1000 * 1000 / LOOPS_PER_SEC);
1001         }
1002
1003         if (!r) {
1004                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
1005                 goto bad;
1006         }
1007
1008         map = dm_task_get_name(dmt);
1009         if (map && strlen(map))
1010                 response = STRDUP((char *)dm_task_get_name(dmt));
1011
1012         dm_task_destroy(dmt);
1013         return response;
1014 bad:
1015         dm_task_destroy(dmt);
1016         condlog(0, "%i:%i: error fetching map name", major, minor);
1017         return NULL;
1018 }
1019
1020 int
1021 dm_remove_partmaps (const char * mapname, int need_sync)
1022 {
1023         struct dm_task *dmt;
1024         struct dm_names *names;
1025         unsigned next = 0;
1026         char params[PARAMS_SIZE];
1027         unsigned long long size;
1028         char dev_t[32];
1029         int r = 1;
1030
1031         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1032                 return 1;
1033
1034         dm_task_no_open_count(dmt);
1035
1036         if (!dm_task_run(dmt))
1037                 goto out;
1038
1039         if (!(names = dm_task_get_names(dmt)))
1040                 goto out;
1041
1042         if (!names->dev) {
1043                 r = 0; /* this is perfectly valid */
1044                 goto out;
1045         }
1046
1047         if (dm_dev_t(mapname, &dev_t[0], 32))
1048                 goto out;
1049
1050         do {
1051                 if (
1052                     /*
1053                      * if devmap target is "linear"
1054                      */
1055                     (dm_type(names->name, TGT_PART) > 0) &&
1056
1057                     /*
1058                      * and both uuid end with same suffix starting
1059                      * at UUID_PREFIX
1060                      */
1061                     (!dm_compare_uuid(names->name, mapname)) &&
1062
1063                     /*
1064                      * and we can fetch the map table from the kernel
1065                      */
1066                     !dm_get_map(names->name, &size, &params[0]) &&
1067
1068                     /*
1069                      * and the table maps over the multipath map
1070                      */
1071                     strstr(params, dev_t)
1072                    ) {
1073                         /*
1074                          * then it's a kpartx generated partition.
1075                          * remove it.
1076                          */
1077                         /*
1078                          * if the opencount is 0 maybe some other
1079                          * partitions depend on it.
1080                          */
1081                         if (dm_get_opencount(names->name)) {
1082                                 dm_remove_partmaps(names->name, need_sync);
1083                                 if (dm_get_opencount(names->name)) {
1084                                         condlog(2, "%s: map in use",
1085                                                 names->name);
1086                                         goto out;
1087                                 }
1088                         }
1089                         condlog(4, "partition map %s removed",
1090                                 names->name);
1091                         dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name,
1092                                            need_sync);
1093                 }
1094
1095                 next = names->next;
1096                 names = (void *) names + next;
1097         } while (next);
1098
1099         r = 0;
1100 out:
1101         dm_task_destroy (dmt);
1102         return r;
1103 }
1104
1105 static struct dm_info *
1106 alloc_dminfo (void)
1107 {
1108         return MALLOC(sizeof(struct dm_info));
1109 }
1110
1111 int
1112 dm_get_info (char * mapname, struct dm_info ** dmi)
1113 {
1114         int r = 1;
1115         struct dm_task *dmt = NULL;
1116
1117         if (!mapname)
1118                 return 1;
1119
1120         if (!*dmi)
1121                 *dmi = alloc_dminfo();
1122
1123         if (!*dmi)
1124                 return 1;
1125
1126         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
1127                 goto out;
1128
1129         if (!dm_task_set_name(dmt, mapname))
1130                 goto out;
1131
1132         dm_task_no_open_count(dmt);
1133
1134         if (!dm_task_run(dmt))
1135                 goto out;
1136
1137         if (!dm_task_get_info(dmt, *dmi))
1138                 goto out;
1139
1140         r = 0;
1141 out:
1142         if (r) {
1143                 memset(*dmi, 0, sizeof(struct dm_info));
1144                 FREE(*dmi);
1145                 *dmi = NULL;
1146         }
1147
1148         if (dmt)
1149                 dm_task_destroy(dmt);
1150
1151         return r;
1152 }
1153
1154 int
1155 dm_rename_partmaps (char * old, char * new)
1156 {
1157         struct dm_task *dmt;
1158         struct dm_names *names;
1159         unsigned next = 0;
1160         char buff[PARAMS_SIZE];
1161         unsigned long long size;
1162         char dev_t[32];
1163         int r = 1;
1164
1165         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1166                 return 1;
1167
1168         dm_task_no_open_count(dmt);
1169
1170         if (!dm_task_run(dmt))
1171                 goto out;
1172
1173         if (!(names = dm_task_get_names(dmt)))
1174                 goto out;
1175
1176         if (!names->dev) {
1177                 r = 0; /* this is perfectly valid */
1178                 goto out;
1179         }
1180
1181         if (dm_dev_t(old, &dev_t[0], 32))
1182                 goto out;
1183
1184         do {
1185                 if (
1186                     /*
1187                      * if devmap target is "linear"
1188                      */
1189                     (dm_type(names->name, TGT_PART) > 0) &&
1190
1191                     /*
1192                      * and the multipath mapname and the part mapname start
1193                      * the same
1194                      */
1195                     !strncmp(names->name, old, strlen(old)) &&
1196
1197                     /*
1198                      * and we can fetch the map table from the kernel
1199                      */
1200                     !dm_get_map(names->name, &size, &buff[0]) &&
1201
1202                     /*
1203                      * and the table maps over the multipath map
1204                      */
1205                     strstr(buff, dev_t)
1206                    ) {
1207                                 /*
1208                                  * then it's a kpartx generated partition.
1209                                  * Rename it.
1210                                  */
1211                                 snprintf(buff, PARAMS_SIZE, "%s%s",
1212                                          new, names->name + strlen(old));
1213                                 dm_rename(names->name, buff);
1214                                 condlog(4, "partition map %s renamed",
1215                                         names->name);
1216                    }
1217
1218                 next = names->next;
1219                 names = (void *) names + next;
1220         } while (next);
1221
1222         r = 0;
1223 out:
1224         dm_task_destroy (dmt);
1225         return r;
1226 }
1227
1228 int
1229 dm_rename (char * old, char * new)
1230 {
1231         int r = 0;
1232         struct dm_task *dmt;
1233
1234         if (dm_rename_partmaps(old, new))
1235                 return r;
1236
1237         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1238                 return r;
1239
1240         if (!dm_task_set_name(dmt, old))
1241                 goto out;
1242
1243         if (!dm_task_set_newname(dmt, new))
1244                 goto out;
1245
1246         dm_task_no_open_count(dmt);
1247
1248         if (!dm_task_set_cookie(dmt, &conf->cookie, 0))
1249                 goto out;
1250         if (!dm_task_run(dmt))
1251                 goto out;
1252
1253         r = 1;
1254 out:
1255         dm_task_destroy(dmt);
1256         return r;
1257 }
1258
1259 int dm_setgeometry(struct multipath *mpp)
1260 {
1261         struct dm_task *dmt;
1262         struct path *pp;
1263         char heads[4], sectors[4];
1264         char cylinders[10], start[32];
1265         int r = 0;
1266
1267         if (!mpp)
1268                 return 1;
1269
1270         pp = first_path(mpp);
1271         if (!pp) {
1272                 condlog(3, "%s: no path for geometry", mpp->alias);
1273                 return 1;
1274         }
1275         if (pp->geom.cylinders == 0 ||
1276             pp->geom.heads == 0 ||
1277             pp->geom.sectors == 0) {
1278                 condlog(3, "%s: invalid geometry on %s", mpp->alias, pp->dev);
1279                 return 1;
1280         }
1281
1282         if (!(dmt = dm_task_create(DM_DEVICE_SET_GEOMETRY)))
1283                 return 0;
1284
1285         if (!dm_task_set_name(dmt, mpp->alias))
1286                 goto out;
1287
1288         dm_task_no_open_count(dmt);
1289
1290         /* What a sick interface ... */
1291         snprintf(heads, 4, "%u", pp->geom.heads);
1292         snprintf(sectors, 4, "%u", pp->geom.sectors);
1293         snprintf(cylinders, 10, "%u", pp->geom.cylinders);
1294         snprintf(start, 32, "%lu", pp->geom.start);
1295         if (!dm_task_set_geometry(dmt, cylinders, heads, sectors, start)) {
1296                 condlog(3, "%s: Failed to set geometry", mpp->alias);
1297                 goto out;
1298         }
1299
1300         r = dm_task_run(dmt);
1301 out:
1302         dm_task_destroy(dmt);
1303
1304         return r;
1305 }