lib/activate/activate.c

   1 /*
   2  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   3  * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
   4  *
   5  * This file is part of LVM2.
   6  *
   7  * This copyrighted material is made available to anyone wishing to use,
   8  * modify, copy, or redistribute it subject to the terms and conditions
   9  * of the GNU Lesser General Public License v.2.1.
  10  *
  11  * You should have received a copy of the GNU Lesser General Public License
  12  * along with this program; if not, write to the Free Software Foundation,
  13  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  14  */
  15
  16 #include "lib.h"
  17 #include "metadata.h"
  18 #include "activate.h"
  19 #include "memlock.h"
  20 #include "display.h"
  21 #include "fs.h"
  22 #include "lvm-exec.h"
  23 #include "lvm-file.h"
  24 #include "lvm-string.h"
  25 #include "toolcontext.h"
  26 #include "dev_manager.h"
  27 #include "str_list.h"
  28 #include "config.h"
  29 #include "filter.h"
  30 #include "segtype.h"
  31 #include "sharedlib.h"
  32
  33 #include <limits.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36
  37 #define _skip(fmt, args...) log_very_verbose("Skipping: " fmt , ## args)
  38
  39 int lvm1_present(struct cmd_context *cmd)
  40 {
  41         char path[PATH_MAX];
  42
  43         if (dm_snprintf(path, sizeof(path), "%s/lvm/global", cmd->proc_dir)
  44             < 0) {
  45                 log_error("LVM1 proc global snprintf failed");
  46                 return 0;
  47         }
  48
  49         if (path_exists(path))
  50                 return 1;
  51         else
  52                 return 0;
  53 }
  54
  55 int list_segment_modules(struct dm_pool *mem, const struct lv_segment *seg,
  56                          struct dm_list *modules)
  57 {
  58         unsigned int s;
  59         struct lv_segment *seg2, *snap_seg;
  60         struct dm_list *snh;
  61
  62         if (seg->segtype->ops->modules_needed &&
  63             !seg->segtype->ops->modules_needed(mem, seg, modules)) {
  64                 log_error("module string allocation failed");
  65                 return 0;
  66         }
  67
  68         if (lv_is_origin(seg->lv))
  69                 dm_list_iterate(snh, &seg->lv->snapshot_segs)
  70                         if (!list_lv_modules(mem,
  71                                              dm_list_struct_base(snh,
  72                                                               struct lv_segment,
  73                                                               origin_list)->cow,
  74                                              modules))
  75                                 return_0;
  76
  77         if (lv_is_cow(seg->lv)) {
  78                 snap_seg = find_cow(seg->lv);
  79                 if (snap_seg->segtype->ops->modules_needed &&
  80                     !snap_seg->segtype->ops->modules_needed(mem, snap_seg,
  81                                                             modules)) {
  82                         log_error("snap_seg module string allocation failed");
  83                         return 0;
  84                 }
  85         }
  86
  87         for (s = 0; s < seg->area_count; s++) {
  88                 switch (seg_type(seg, s)) {
  89                 case AREA_LV:
  90                         seg2 = find_seg_by_le(seg_lv(seg, s), seg_le(seg, s));
  91                         if (seg2 && !list_segment_modules(mem, seg2, modules))
  92                                 return_0;
  93                         break;
  94                 case AREA_PV:
  95                 case AREA_UNASSIGNED:
  96                         ;
  97                 }
  98         }
  99
 100         return 1;
 101 }
 102
 103 int list_lv_modules(struct dm_pool *mem, const struct logical_volume *lv,
 104                     struct dm_list *modules)
 105 {
 106         struct lv_segment *seg;
 107
 108         dm_list_iterate_items(seg, &lv->segments)
 109                 if (!list_segment_modules(mem, seg, modules))
 110                         return_0;
 111
 112         return 1;
 113 }
 114
 115 #ifndef DEVMAPPER_SUPPORT
 116 void set_activation(int act)
 117 {
 118         static int warned = 0;
 119
 120         if (warned || !act)
 121                 return;
 122
 123         log_error("Compiled without libdevmapper support. "
 124                   "Can't enable activation.");
 125
 126         warned = 1;
 127 }
 128 int activation(void)
 129 {
 130         return 0;
 131 }
 132 int library_version(char *version, size_t size)
 133 {
 134         return 0;
 135 }
 136 int driver_version(char *version, size_t size)
 137 {
 138         return 0;
 139 }
 140 int target_version(const char *target_name, uint32_t *maj,
 141                    uint32_t *min, uint32_t *patchlevel)
 142 {
 143         return 0;
 144 }
 145 int target_present(struct cmd_context *cmd, const char *target_name,
 146                    int use_modprobe)
 147 {
 148         return 0;
 149 }
 150 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, unsigned origin_only,
 151             struct lvinfo *info, int with_open_count, int with_read_ahead)
 152 {
 153         return 0;
 154 }
 155 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 156                     unsigned origin_only,
 157                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 158 {
 159         return 0;
 160 }
 161 int lv_snapshot_percent(const struct logical_volume *lv, percent_t *percent)
 162 {
 163         return 0;
 164 }
 165 int lv_mirror_percent(struct cmd_context *cmd, const struct logical_volume *lv,
 166                       int wait, percent_t *percent, uint32_t *event_nr)
 167 {
 168         return 0;
 169 }
 170 int lvs_in_vg_activated(struct volume_group *vg)
 171 {
 172         return 0;
 173 }
 174 int lvs_in_vg_opened(const struct volume_group *vg)
 175 {
 176         return 0;
 177 }
 178 /******
 179 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
 180 {
 181         return 1;
 182 }
 183 *******/
 184 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
 185 {
 186         return 1;
 187 }
 188 int lv_resume(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
 189 {
 190         return 1;
 191 }
 192 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s,
 193                         unsigned origin_only, unsigned exclusive)
 194 {
 195         return 1;
 196 }
 197 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
 198 {
 199         return 1;
 200 }
 201 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
 202                          int *activate_lv)
 203 {
 204         return 1;
 205 }
 206 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
 207 {
 208         return 1;
 209 }
 210 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
 211 {
 212         return 1;
 213 }
 214 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
 215 {
 216         return 1;
 217 }
 218 int pv_uses_vg(struct physical_volume *pv,
 219                struct volume_group *vg)
 220 {
 221         return 0;
 222 }
 223 void activation_release(void)
 224 {
 225 }
 226 void activation_exit(void)
 227 {
 228 }
 229 int lv_is_active(struct logical_volume *lv)
 230 {
 231         return 0;
 232 }
 233 int lv_is_active_exclusive_locally(struct logical_volume *lv)
 234 {
 235         return 0;
 236 }
 237 int lv_is_active_exclusive_remotely(struct logical_volume *lv)
 238 {
 239         return 0;
 240 }
 241 int lv_check_transient(struct logical_volume *lv)
 242 {
 243         return 1;
 244 }
 245 int monitor_dev_for_events(struct cmd_context *cmd, struct logical_volume *lv,
 246                            struct lv_activate_opts *laopts, int monitor)
 247 {
 248         return 1;
 249 }
 250 #else                           /* DEVMAPPER_SUPPORT */
 251
 252 static int _activation = 1;
 253
 254 void set_activation(int act)
 255 {
 256         if (act == _activation)
 257                 return;
 258
 259         _activation = act;
 260         if (_activation)
 261                 log_verbose("Activation enabled. Device-mapper kernel "
 262                             "driver will be used.");
 263         else
 264                 log_warn("WARNING: Activation disabled. No device-mapper "
 265                           "interaction will be attempted.");
 266 }
 267
 268 int activation(void)
 269 {
 270         return _activation;
 271 }
 272
 273 static int _passes_activation_filter(struct cmd_context *cmd,
 274                                      struct logical_volume *lv)
 275 {
 276         const struct config_node *cn;
 277         const struct config_value *cv;
 278         const char *str;
 279         char path[PATH_MAX];
 280
 281         if (!(cn = find_config_tree_node(cmd, "activation/volume_list"))) {
 282                 log_verbose("activation/volume_list configuration setting "
 283                             "not defined, checking only host tags for %s/%s",
 284                             lv->vg->name, lv->name);
 285
 286                 /* If no host tags defined, activate */
 287                 if (dm_list_empty(&cmd->tags))
 288                         return 1;
 289
 290                 /* If any host tag matches any LV or VG tag, activate */
 291                 if (str_list_match_list(&cmd->tags, &lv->tags, NULL) ||
 292                     str_list_match_list(&cmd->tags, &lv->vg->tags, NULL))
 293                         return 1;
 294
 295                 log_verbose("No host tag matches %s/%s",
 296                             lv->vg->name, lv->name);
 297
 298                 /* Don't activate */
 299                 return 0;
 300         }
 301         else
 302                 log_verbose("activation/volume_list configuration setting "
 303                             "defined, checking the list to match %s/%s",
 304                             lv->vg->name, lv->name);
 305
 306         for (cv = cn->v; cv; cv = cv->next) {
 307                 if (cv->type != CFG_STRING) {
 308                         log_error("Ignoring invalid string in config file "
 309                                   "activation/volume_list");
 310                         continue;
 311                 }
 312                 str = cv->v.str;
 313                 if (!*str) {
 314                         log_error("Ignoring empty string in config file "
 315                                   "activation/volume_list");
 316                         continue;
 317                 }
 318
 319
 320                 /* Tag? */
 321                 if (*str == '@') {
 322                         str++;
 323                         if (!*str) {
 324                                 log_error("Ignoring empty tag in config file "
 325                                           "activation/volume_list");
 326                                 continue;
 327                         }
 328                         /* If any host tag matches any LV or VG tag, activate */
 329                         if (!strcmp(str, "*")) {
 330                                 if (str_list_match_list(&cmd->tags, &lv->tags, NULL)
 331                                     || str_list_match_list(&cmd->tags,
 332                                                            &lv->vg->tags, NULL))
 333                                             return 1;
 334                                 else
 335                                         continue;
 336                         }
 337                         /* If supplied tag matches LV or VG tag, activate */
 338                         if (str_list_match_item(&lv->tags, str) ||
 339                             str_list_match_item(&lv->vg->tags, str))
 340                                 return 1;
 341                         else
 342                                 continue;
 343                 }
 344                 if (!strchr(str, '/')) {
 345                         /* vgname supplied */
 346                         if (!strcmp(str, lv->vg->name))
 347                                 return 1;
 348                         else
 349                                 continue;
 350                 }
 351                 /* vgname/lvname */
 352                 if (dm_snprintf(path, sizeof(path), "%s/%s", lv->vg->name,
 353                                  lv->name) < 0) {
 354                         log_error("dm_snprintf error from %s/%s", lv->vg->name,
 355                                   lv->name);
 356                         continue;
 357                 }
 358                 if (!strcmp(path, str))
 359                         return 1;
 360         }
 361
 362         log_verbose("No item supplied in activation/volume_list configuration "
 363                     "setting matches %s/%s", lv->vg->name, lv->name);
 364
 365         return 0;
 366 }
 367
 368 int library_version(char *version, size_t size)
 369 {
 370         if (!activation())
 371                 return 0;
 372
 373         return dm_get_library_version(version, size);
 374 }
 375
 376 int driver_version(char *version, size_t size)
 377 {
 378         if (!activation())
 379                 return 0;
 380
 381         log_very_verbose("Getting driver version");
 382
 383         return dm_driver_version(version, size);
 384 }
 385
 386 int target_version(const char *target_name, uint32_t *maj,
 387                    uint32_t *min, uint32_t *patchlevel)
 388 {
 389         int r = 0;
 390         struct dm_task *dmt;
 391         struct dm_versions *target, *last_target;
 392
 393         log_very_verbose("Getting target version for %s", target_name);
 394         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 395                 return_0;
 396
 397         if (!dm_task_run(dmt)) {
 398                 log_debug("Failed to get %s target version", target_name);
 399                 /* Assume this was because LIST_VERSIONS isn't supported */
 400                 return 1;
 401         }
 402
 403         target = dm_task_get_versions(dmt);
 404
 405         do {
 406                 last_target = target;
 407
 408                 if (!strcmp(target_name, target->name)) {
 409                         r = 1;
 410                         *maj = target->version[0];
 411                         *min = target->version[1];
 412                         *patchlevel = target->version[2];
 413                         goto out;
 414                 }
 415
 416                 target = (struct dm_versions *)((char *) target + target->next);
 417         } while (last_target != target);
 418
 419       out:
 420         dm_task_destroy(dmt);
 421
 422         return r;
 423 }
 424
 425 int module_present(struct cmd_context *cmd, const char *target_name)
 426 {
 427         int ret = 0;
 428 #ifdef MODPROBE_CMD
 429         char module[128];
 430         const char *argv[3];
 431
 432         if (dm_snprintf(module, sizeof(module), "dm-%s", target_name) < 0) {
 433                 log_error("module_present module name too long: %s",
 434                           target_name);
 435                 return 0;
 436         }
 437
 438         argv[0] = MODPROBE_CMD;
 439         argv[1] = module;
 440         argv[2] = NULL;
 441
 442         ret = exec_cmd(cmd, argv, NULL, 0);
 443 #endif
 444         return ret;
 445 }
 446
 447 int target_present(struct cmd_context *cmd, const char *target_name,
 448                    int use_modprobe)
 449 {
 450         uint32_t maj, min, patchlevel;
 451
 452         if (!activation())
 453                 return 0;
 454
 455 #ifdef MODPROBE_CMD
 456         if (use_modprobe) {
 457                 if (target_version(target_name, &maj, &min, &patchlevel))
 458                         return 1;
 459
 460                 if (!module_present(cmd, target_name))
 461                         return_0;
 462         }
 463 #endif
 464
 465         return target_version(target_name, &maj, &min, &patchlevel);
 466 }
 467
 468 /*
 469  * Returns 1 if info structure populated, else 0 on failure.
 470  */
 471 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, unsigned origin_only,
 472             struct lvinfo *info, int with_open_count, int with_read_ahead)
 473 {
 474         struct dm_info dminfo;
 475
 476         if (!activation())
 477                 return 0;
 478         /*
 479          * If open_count info is requested and we have to be sure our own udev
 480          * transactions are finished
 481          * For non-clustered locking type we are only interested for non-delete operation
 482          * in progress - as only those could lead to opened files
 483          */
 484         if (with_open_count) {
 485                 if (locking_is_clustered())
 486                         sync_local_dev_names(cmd); /* Wait to have udev in sync */
 487                 else if (fs_has_non_delete_ops())
 488                         fs_unlock(); /* For non clustered - wait if there are non-delete ops */
 489         }
 490
 491         if (!dev_manager_info(lv->vg->cmd->mem, lv, origin_only ? "real" : NULL, with_open_count,
 492                               with_read_ahead, &dminfo, &info->read_ahead))
 493                 return_0;
 494
 495         info->exists = dminfo.exists;
 496         info->suspended = dminfo.suspended;
 497         info->open_count = dminfo.open_count;
 498         info->major = dminfo.major;
 499         info->minor = dminfo.minor;
 500         info->read_only = dminfo.read_only;
 501         info->live_table = dminfo.live_table;
 502         info->inactive_table = dminfo.inactive_table;
 503
 504         return 1;
 505 }
 506
 507 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 508                     unsigned origin_only,
 509                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 510 {
 511         int r;
 512         struct logical_volume *lv;
 513
 514         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 515                 return 0;
 516
 517         if (!lv_is_origin(lv))
 518                 origin_only = 0;
 519
 520         r = lv_info(cmd, lv, origin_only, info, with_open_count, with_read_ahead);
 521         free_vg(lv->vg);
 522
 523         return r;
 524 }
 525
 526 /*
 527  * Returns 1 if percent set, else 0 on failure.
 528  */
 529 int lv_check_transient(struct logical_volume *lv)
 530 {
 531         int r;
 532         struct dev_manager *dm;
 533
 534         if (!activation())
 535                 return 0;
 536
 537         log_debug("Checking transient status for LV %s/%s", lv->vg->name, lv->name);
 538
 539         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 540                 return_0;
 541
 542         if (!(r = dev_manager_transient(dm, lv)))
 543                 stack;
 544
 545         dev_manager_destroy(dm);
 546
 547         return r;
 548 }
 549
 550 /*
 551  * Returns 1 if percent set, else 0 on failure.
 552  */
 553 int lv_snapshot_percent(const struct logical_volume *lv, percent_t *percent)
 554 {
 555         int r;
 556         struct dev_manager *dm;
 557
 558         if (!activation())
 559                 return 0;
 560
 561         log_debug("Checking snapshot percent for LV %s/%s", lv->vg->name, lv->name);
 562
 563         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 564                 return_0;
 565
 566         if (!(r = dev_manager_snapshot_percent(dm, lv, percent)))
 567                 stack;
 568
 569         dev_manager_destroy(dm);
 570
 571         return r;
 572 }
 573
 574 /* FIXME Merge with snapshot_percent */
 575 int lv_mirror_percent(struct cmd_context *cmd, const struct logical_volume *lv,
 576                       int wait, percent_t *percent, uint32_t *event_nr)
 577 {
 578         int r;
 579         struct dev_manager *dm;
 580         struct lvinfo info;
 581
 582         /* If mirrored LV is temporarily shrinked to 1 area (= linear),
 583          * it should be considered in-sync. */
 584         if (dm_list_size(&lv->segments) == 1 && first_seg(lv)->area_count == 1) {
 585                 *percent = PERCENT_100;
 586                 return 1;
 587         }
 588
 589         if (!activation())
 590                 return 0;
 591
 592         log_debug("Checking mirror percent for LV %s/%s", lv->vg->name, lv->name);
 593
 594         if (!lv_info(cmd, lv, 0, &info, 0, 0))
 595                 return_0;
 596
 597         if (!info.exists)
 598                 return 0;
 599
 600         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 601                 return_0;
 602
 603         if (!(r = dev_manager_mirror_percent(dm, lv, wait, percent, event_nr)))
 604                 stack;
 605
 606         dev_manager_destroy(dm);
 607
 608         return r;
 609 }
 610
 611 static int _lv_active(struct cmd_context *cmd, struct logical_volume *lv)
 612 {
 613         struct lvinfo info;
 614
 615         if (!lv_info(cmd, lv, 0, &info, 0, 0)) {
 616                 stack;
 617                 return -1;
 618         }
 619
 620         return info.exists;
 621 }
 622
 623 static int _lv_open_count(struct cmd_context *cmd, struct logical_volume *lv)
 624 {
 625         struct lvinfo info;
 626
 627         if (!lv_info(cmd, lv, 0, &info, 1, 0)) {
 628                 stack;
 629                 return -1;
 630         }
 631
 632         return info.open_count;
 633 }
 634
 635 static int _lv_activate_lv(struct logical_volume *lv, struct lv_activate_opts *laopts)
 636 {
 637         int r;
 638         struct dev_manager *dm;
 639
 640         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, (lv->status & PVMOVE) ? 0 : 1)))
 641                 return_0;
 642
 643         if (!(r = dev_manager_activate(dm, lv, laopts)))
 644                 stack;
 645
 646         dev_manager_destroy(dm);
 647         return r;
 648 }
 649
 650 static int _lv_preload(struct logical_volume *lv, struct lv_activate_opts *laopts,
 651                        int *flush_required)
 652 {
 653         int r;
 654         struct dev_manager *dm;
 655
 656         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, (lv->status & PVMOVE) ? 0 : 1)))
 657                 return_0;
 658
 659         if (!(r = dev_manager_preload(dm, lv, laopts, flush_required)))
 660                 stack;
 661
 662         dev_manager_destroy(dm);
 663         return r;
 664 }
 665
 666 static int _lv_deactivate(struct logical_volume *lv)
 667 {
 668         int r;
 669         struct dev_manager *dm;
 670
 671         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 672                 return_0;
 673
 674         if (!(r = dev_manager_deactivate(dm, lv)))
 675                 stack;
 676
 677         dev_manager_destroy(dm);
 678         return r;
 679 }
 680
 681 static int _lv_suspend_lv(struct logical_volume *lv, struct lv_activate_opts *laopts,
 682                           int lockfs, int flush_required)
 683 {
 684         int r;
 685         struct dev_manager *dm;
 686
 687         /*
 688          * When we are asked to manipulate (normally suspend/resume) the PVMOVE
 689          * device directly, we don't want to touch the devices that use it.
 690          */
 691         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, (lv->status & PVMOVE) ? 0 : 1)))
 692                 return_0;
 693
 694         if (!(r = dev_manager_suspend(dm, lv, laopts, lockfs, flush_required)))
 695                 stack;
 696
 697         dev_manager_destroy(dm);
 698         return r;
 699 }
 700
 701 /*
 702  * These two functions return the number of visible LVs in the state,
 703  * or -1 on error.  FIXME Check this.
 704  */
 705 int lvs_in_vg_activated(struct volume_group *vg)
 706 {
 707         struct lv_list *lvl;
 708         int count = 0;
 709
 710         if (!activation())
 711                 return 0;
 712
 713         dm_list_iterate_items(lvl, &vg->lvs)
 714                 if (lv_is_visible(lvl->lv))
 715                         count += (_lv_active(vg->cmd, lvl->lv) == 1);
 716
 717         log_debug("Counted %d active LVs in VG %s", count, vg->name);
 718
 719         return count;
 720 }
 721
 722 int lvs_in_vg_opened(const struct volume_group *vg)
 723 {
 724         const struct lv_list *lvl;
 725         int count = 0;
 726
 727         if (!activation())
 728                 return 0;
 729
 730         dm_list_iterate_items(lvl, &vg->lvs)
 731                 if (lv_is_visible(lvl->lv))
 732                         count += (_lv_open_count(vg->cmd, lvl->lv) > 0);
 733
 734         log_debug("Counted %d open LVs in VG %s", count, vg->name);
 735
 736         return count;
 737 }
 738
 739 /*
 740  * _lv_is_active
 741  * @lv:        logical volume being queried
 742  * @locally:   set if active locally (when provided)
 743  * @exclusive: set if active exclusively (when provided)
 744  *
 745  * Determine whether an LV is active locally or in a cluster.
 746  * In addition to the return code which indicates whether or
 747  * not the LV is active somewhere, two other values are set
 748  * to yield more information about the status of the activation:
 749  *      return  locally exclusively     status
 750  *      ======  ======= ===========     ======
 751  *         0       0        0           not active
 752  *         1       0        0           active remotely
 753  *         1       0        1           exclusive remotely
 754  *         1       1        0           active locally and possibly remotely
 755  *         1       1        1           exclusive locally (or local && !cluster)
 756  * The VG lock must be held to call this function.
 757  *
 758  * Returns: 0 or 1
 759  */
 760 static int _lv_is_active(struct logical_volume *lv,
 761                          int *locally, int *exclusive)
 762 {
 763         int r, l, e; /* remote, local, and exclusive */
 764
 765         r = l = e = 0;
 766
 767         if (_lv_active(lv->vg->cmd, lv))
 768                 l = 1;
 769
 770         if (!vg_is_clustered(lv->vg)) {
 771                 e = 1;  /* exclusive by definition */
 772                 goto out;
 773         }
 774
 775         /* Active locally, and the caller doesn't care about exclusive */
 776         if (l && !exclusive)
 777                 goto out;
 778
 779         if ((r = remote_lock_held(lv->lvid.s, &e)) >= 0)
 780                 goto out;
 781
 782         /*
 783          * If lock query is not supported (due to interfacing with old
 784          * code), then we cannot evaluate exclusivity properly.
 785          *
 786          * Old users of this function will never be affected by this,
 787          * since they are only concerned about active vs. not active.
 788          * New users of this function who specifically ask for 'exclusive'
 789          * will be given an error message.
 790          */
 791         if (l) {
 792                 if (exclusive)
 793                         log_error("Unable to determine exclusivity of %s",
 794                                   lv->name);
 795                 goto out;
 796         }
 797
 798         /* FIXME: Is this fallback alright? */
 799         if (activate_lv_excl(lv->vg->cmd, lv)) {
 800                 if (!deactivate_lv(lv->vg->cmd, lv))
 801                         stack;
 802                 /* FIXME: locally & exclusive are undefined. */
 803                 return 0;
 804         }
 805         /* FIXME: Check exclusive value here. */
 806 out:
 807         if (locally)
 808                 *locally = l;
 809         if (exclusive)
 810                 *exclusive = e;
 811
 812         log_very_verbose("%s/%s is %sactive%s%s",
 813                          lv->vg->name, lv->name,
 814                          (r || l) ? "" : "not ",
 815                          (exclusive && e) ? " exclusive" : "",
 816                          e ? (l ? " locally" : " remotely") : "");
 817
 818         return r || l;
 819 }
 820
 821 int lv_is_active(struct logical_volume *lv)
 822 {
 823         return _lv_is_active(lv, NULL, NULL);
 824 }
 825
 826 /*
 827 int lv_is_active_locally(struct logical_volume *lv)
 828 {
 829         int l;
 830         return _lv_is_active(lv, &l, NULL) && l;
 831 }
 832 */
 833
 834 int lv_is_active_exclusive_locally(struct logical_volume *lv)
 835 {
 836         int l, e;
 837
 838         return _lv_is_active(lv, &l, &e) && l && e;
 839 }
 840
 841 int lv_is_active_exclusive_remotely(struct logical_volume *lv)
 842 {
 843         int l, e;
 844
 845         return _lv_is_active(lv, &l, &e) && !l && e;
 846 }
 847
 848 #ifdef DMEVENTD
 849 static struct dm_event_handler *_create_dm_event_handler(struct cmd_context *cmd, const char *dmuuid, const char *dso,
 850                                                          const int timeout, enum dm_event_mask mask)
 851 {
 852         struct dm_event_handler *dmevh;
 853
 854         if (!(dmevh = dm_event_handler_create()))
 855                 return_NULL;
 856
 857         if (dm_event_handler_set_dmeventd_path(dmevh, find_config_tree_str(cmd, "dmeventd/executable", NULL)))
 858                 goto_bad;
 859
 860         if (dm_event_handler_set_dso(dmevh, dso))
 861                 goto_bad;
 862
 863         if (dm_event_handler_set_uuid(dmevh, dmuuid))
 864                 goto_bad;
 865
 866         dm_event_handler_set_timeout(dmevh, timeout);
 867         dm_event_handler_set_event_mask(dmevh, mask);
 868
 869         return dmevh;
 870
 871 bad:
 872         dm_event_handler_destroy(dmevh);
 873         return NULL;
 874 }
 875
 876 char *get_monitor_dso_path(struct cmd_context *cmd, const char *libpath)
 877 {
 878         char *path;
 879
 880         if (!(path = dm_pool_alloc(cmd->mem, PATH_MAX))) {
 881                 log_error("Failed to allocate dmeventd library path.");
 882                 return NULL;
 883         }
 884
 885         get_shared_library_path(cmd, libpath, path, PATH_MAX);
 886
 887         return path;
 888 }
 889
 890 int target_registered_with_dmeventd(struct cmd_context *cmd, const char *dso,
 891                                     struct logical_volume *lv, int *pending)
 892 {
 893         char *uuid;
 894         enum dm_event_mask evmask = 0;
 895         struct dm_event_handler *dmevh;
 896
 897         *pending = 0;
 898
 899         if (!dso)
 900                 return_0;
 901
 902         /* We always monitor the "real" device, never the "snapshot-origin" itself. */
 903         if (!(uuid = build_dm_uuid(cmd->mem, lv->lvid.s, lv_is_origin(lv) ? "real" : NULL)))
 904                 return_0;
 905
 906         if (!(dmevh = _create_dm_event_handler(cmd, uuid, dso, 0, DM_EVENT_ALL_ERRORS)))
 907                 return_0;
 908
 909         if (dm_event_get_registered_device(dmevh, 0)) {
 910                 dm_event_handler_destroy(dmevh);
 911                 return 0;
 912         }
 913
 914         evmask = dm_event_handler_get_event_mask(dmevh);
 915         if (evmask & DM_EVENT_REGISTRATION_PENDING) {
 916                 *pending = 1;
 917                 evmask &= ~DM_EVENT_REGISTRATION_PENDING;
 918         }
 919
 920         dm_event_handler_destroy(dmevh);
 921
 922         return evmask;
 923 }
 924
 925 int target_register_events(struct cmd_context *cmd, const char *dso, struct logical_volume *lv,
 926                             int evmask __attribute__((unused)), int set, int timeout)
 927 {
 928         char *uuid;
 929         struct dm_event_handler *dmevh;
 930         int r;
 931
 932         if (!dso)
 933                 return_0;
 934
 935         /* We always monitor the "real" device, never the "snapshot-origin" itself. */
 936         if (!(uuid = build_dm_uuid(cmd->mem, lv->lvid.s, lv_is_origin(lv) ? "real" : NULL)))
 937                 return_0;
 938
 939         if (!(dmevh = _create_dm_event_handler(cmd, uuid, dso, timeout,
 940                                                DM_EVENT_ALL_ERRORS | (timeout ? DM_EVENT_TIMEOUT : 0))))
 941                 return_0;
 942
 943         r = set ? dm_event_register_handler(dmevh) : dm_event_unregister_handler(dmevh);
 944
 945         dm_event_handler_destroy(dmevh);
 946
 947         if (!r)
 948                 return_0;
 949
 950         log_info("%s %s for events", set ? "Monitored" : "Unmonitored", uuid);
 951
 952         return 1;
 953 }
 954
 955 #endif
 956
 957 /*
 958  * Returns 0 if an attempt to (un)monitor the device failed.
 959  * Returns 1 otherwise.
 960  */
 961 int monitor_dev_for_events(struct cmd_context *cmd, struct logical_volume *lv,
 962                            const struct lv_activate_opts *laopts, int monitor)
 963 {
 964 #ifdef DMEVENTD
 965         int i, pending = 0, monitored;
 966         int r = 1;
 967         struct dm_list *tmp, *snh, *snht;
 968         struct lv_segment *seg;
 969         struct lv_segment *log_seg;
 970         int (*monitor_fn) (struct lv_segment *s, int e);
 971         uint32_t s;
 972         static const struct lv_activate_opts zlaopts = { 0 };
 973
 974         if (!laopts)
 975                 laopts = &zlaopts;
 976
 977         /* skip dmeventd code altogether */
 978         if (dmeventd_monitor_mode() == DMEVENTD_MONITOR_IGNORE)
 979                 return 1;
 980
 981         /*
 982          * Nothing to do if dmeventd configured not to be used.
 983          */
 984         if (monitor && !dmeventd_monitor_mode())
 985                 return 1;
 986
 987         /*
 988          * In case of a snapshot device, we monitor lv->snapshot->lv,
 989          * not the actual LV itself.
 990          */
 991         if (lv_is_cow(lv) && (laopts->no_merging || !lv_is_merging_cow(lv)))
 992                 return monitor_dev_for_events(cmd, lv->snapshot->lv, NULL, monitor);
 993
 994         /*
 995          * In case this LV is a snapshot origin, we instead monitor
 996          * each of its respective snapshots.  The origin itself may
 997          * also need to be monitored if it is a mirror, for example.
 998          */
 999         if (!laopts->origin_only && lv_is_origin(lv))
1000                 dm_list_iterate_safe(snh, snht, &lv->snapshot_segs)
1001                         if (!monitor_dev_for_events(cmd, dm_list_struct_base(snh,
1002                                     struct lv_segment, origin_list)->cow, NULL, monitor))
1003                                 r = 0;
1004
1005         /*
1006          * If the volume is mirrored and its log is also mirrored, monitor
1007          * the log volume as well.
1008          */
1009         if ((seg = first_seg(lv)) != NULL && seg->log_lv != NULL &&
1010             (log_seg = first_seg(seg->log_lv)) != NULL &&
1011             seg_is_mirrored(log_seg))
1012                 if (!monitor_dev_for_events(cmd, seg->log_lv, NULL, monitor))
1013                         r = 0;
1014
1015         dm_list_iterate(tmp, &lv->segments) {
1016                 seg = dm_list_item(tmp, struct lv_segment);
1017
1018                 /* Recurse for AREA_LV */
1019                 for (s = 0; s < seg->area_count; s++) {
1020                         if (seg_type(seg, s) != AREA_LV)
1021                                 continue;
1022                         if (!monitor_dev_for_events(cmd, seg_lv(seg, s), NULL,
1023                                                     monitor)) {
1024                                 log_error("Failed to %smonitor %s",
1025                                           monitor ? "" : "un",
1026                                           seg_lv(seg, s)->name);
1027                                 r = 0;
1028                         }
1029                 }
1030
1031                 if (!seg_monitored(seg) || (seg->status & PVMOVE))
1032                         continue;
1033
1034                 monitor_fn = NULL;
1035
1036                 /* Check monitoring status */
1037                 if (seg->segtype->ops->target_monitored)
1038                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
1039                 else
1040                         continue;  /* segtype doesn't support registration */
1041
1042                 /*
1043                  * FIXME: We should really try again if pending
1044                  */
1045                 monitored = (pending) ? 0 : monitored;
1046
1047                 if (monitor) {
1048                         if (monitored)
1049                                 log_verbose("%s/%s already monitored.", lv->vg->name, lv->name);
1050                         else if (seg->segtype->ops->target_monitor_events)
1051                                 monitor_fn = seg->segtype->ops->target_monitor_events;
1052                 } else {
1053                         if (!monitored)
1054                                 log_verbose("%s/%s already not monitored.", lv->vg->name, lv->name);
1055                         else if (seg->segtype->ops->target_unmonitor_events)
1056                                 monitor_fn = seg->segtype->ops->target_unmonitor_events;
1057                 }
1058
1059                 /* Do [un]monitor */
1060                 if (!monitor_fn)
1061                         continue;
1062
1063                 log_verbose("%sonitoring %s/%s%s", monitor ? "M" : "Not m", lv->vg->name, lv->name,
1064                             test_mode() ? " [Test mode: skipping this]" : "");
1065
1066                 /* FIXME Test mode should really continue a bit further. */
1067                 if (test_mode())
1068                         continue;
1069
1070                 /* FIXME specify events */
1071                 if (!monitor_fn(seg, 0)) {
1072                         log_error("%s/%s: %s segment monitoring function failed.",
1073                                   lv->vg->name, lv->name, seg->segtype->name);
1074                         return 0;
1075                 }
1076
1077                 /* Check [un]monitor results */
1078                 /* Try a couple times if pending, but not forever... */
1079                 for (i = 0; i < 10; i++) {
1080                         pending = 0;
1081                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
1082                         if (pending ||
1083                             (!monitored && monitor) ||
1084                             (monitored && !monitor))
1085                                 log_very_verbose("%s/%s %smonitoring still pending: waiting...",
1086                                                  lv->vg->name, lv->name, monitor ? "" : "un");
1087                         else
1088                                 break;
1089                         sleep(1);
1090                 }
1091
1092                 if (r)
1093                         r = (monitored && monitor) || (!monitored && !monitor);
1094         }
1095
1096         return r;
1097 #else
1098         return 1;
1099 #endif
1100 }
1101
1102 static int _lv_suspend(struct cmd_context *cmd, const char *lvid_s,
1103                        struct lv_activate_opts *laopts, int error_if_not_suspended)
1104 {
1105         struct logical_volume *lv = NULL, *lv_pre = NULL, *pvmove_lv = NULL;
1106         struct lv_list *lvl_pre;
1107         struct seg_list *sl;
1108         struct lvinfo info;
1109         int r = 0, lockfs = 0, flush_required = 0;
1110
1111         if (!activation())
1112                 return 1;
1113
1114         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1115                 goto_out;
1116
1117         /* Use precommitted metadata if present */
1118         if (!(lv_pre = lv_from_lvid(cmd, lvid_s, 1)))
1119                 goto_out;
1120
1121         /* Ignore origin_only unless LV is origin in both old and new metadata */
1122         if (!lv_is_origin(lv) || !lv_is_origin(lv_pre))
1123                 laopts->origin_only = 0;
1124
1125         if (test_mode()) {
1126                 _skip("Suspending %s%s.", lv->name, laopts->origin_only ? " origin without snapshots" : "");
1127                 r = 1;
1128                 goto out;
1129         }
1130
1131         if (!lv_info(cmd, lv, laopts->origin_only, &info, 0, 0))
1132                 goto_out;
1133
1134         if (!info.exists || info.suspended) {
1135                 if (!error_if_not_suspended) {
1136                         r = 1;
1137                         if (info.suspended)
1138                                 critical_section_inc(cmd, "already suspended");
1139                 }
1140                 goto out;
1141         }
1142
1143         if (!lv_read_replicator_vgs(lv))
1144                 goto_out;
1145
1146         lv_calculate_readahead(lv, NULL);
1147
1148         /*
1149          * If VG was precommitted, preload devices for the LV.
1150          * If the PVMOVE LV is being removed, it's only present in the old
1151          * metadata and not the new, so we must explicitly add the new
1152          * tables for all the changed LVs here, as the relationships
1153          * are not found by walking the new metadata.
1154          */
1155         if ((lv_pre->vg->status & PRECOMMITTED)) {
1156                 if (!(lv_pre->status & LOCKED) &&
1157                     (lv->status & LOCKED) &&
1158                     (pvmove_lv = find_pvmove_lv_in_lv(lv))) {
1159                         /* Preload all the LVs above the PVMOVE LV */
1160                         dm_list_iterate_items(sl, &pvmove_lv->segs_using_this_lv) {
1161                                 if (!(lvl_pre = find_lv_in_vg(lv_pre->vg, sl->seg->lv->name))) {
1162                                         /* FIXME Internal error? */
1163                                         log_error("LV %s missing from preload metadata", sl->seg->lv->name);
1164                                         goto out;
1165                                 }
1166                                 if (!_lv_preload(lvl_pre->lv, laopts, &flush_required))
1167                                         goto_out;
1168                         }
1169                         /* Now preload the PVMOVE LV itself */
1170                         if (!(lvl_pre = find_lv_in_vg(lv_pre->vg, pvmove_lv->name))) {
1171                                 /* FIXME Internal error? */
1172                                 log_error("LV %s missing from preload metadata", pvmove_lv->name);
1173                                 goto out;
1174                         }
1175                         if (!_lv_preload(lvl_pre->lv, laopts, &flush_required))
1176                                 goto_out;
1177                 } else if (!_lv_preload(lv_pre, laopts, &flush_required))
1178                         /* FIXME Revert preloading */
1179                         goto_out;
1180         }
1181
1182         if (!monitor_dev_for_events(cmd, lv, laopts, 0))
1183                 /* FIXME Consider aborting here */
1184                 stack;
1185
1186         critical_section_inc(cmd, "suspending");
1187         if (pvmove_lv)
1188                 critical_section_inc(cmd, "suspending pvmove LV");
1189
1190         if (!laopts->origin_only &&
1191             (lv_is_origin(lv_pre) || lv_is_cow(lv_pre)))
1192                 lockfs = 1;
1193
1194         /*
1195          * Suspending an LV directly above a PVMOVE LV also
1196          * suspends other LVs using that same PVMOVE LV.
1197          * FIXME Remove this and delay the 'clear node' until
1198          * after the code knows whether there's a different
1199          * inactive table to load or not instead so lv_suspend
1200          * can be called separately for each LV safely.
1201          */
1202         if ((lv_pre->vg->status & PRECOMMITTED) &&
1203             (lv_pre->status & LOCKED) && find_pvmove_lv_in_lv(lv_pre)) {
1204                 if (!_lv_suspend_lv(lv_pre, laopts, lockfs, flush_required)) {
1205                         critical_section_dec(cmd, "failed precommitted suspend");
1206                         if (pvmove_lv)
1207                                 critical_section_dec(cmd, "failed precommitted suspend (pvmove)");
1208                         goto_out;
1209                 }
1210         } else {
1211                 /* Normal suspend */
1212                 if (!_lv_suspend_lv(lv, laopts, lockfs, flush_required)) {
1213                         critical_section_dec(cmd, "failed suspend");
1214                         if (pvmove_lv)
1215                                 critical_section_dec(cmd, "failed suspend (pvmove)");
1216                         goto_out;
1217                 }
1218         }
1219
1220         r = 1;
1221 out:
1222         if (lv_pre)
1223                 free_vg(lv_pre->vg);
1224         if (lv) {
1225                 lv_release_replicator_vgs(lv);
1226                 free_vg(lv->vg);
1227         }
1228
1229         return r;
1230 }
1231
1232 /* Returns success if the device is not active */
1233 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1234 {
1235         struct lv_activate_opts laopts = { .origin_only = origin_only };
1236
1237         return _lv_suspend(cmd, lvid_s, &laopts, 0);
1238 }
1239
1240 /* No longer used */
1241 /***********
1242 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
1243 {
1244         return _lv_suspend(cmd, lvid_s, 1);
1245 }
1246 ***********/
1247
1248  /*
1249   * _lv_resume
1250   * @cmd
1251   * @lvid_s
1252   * @origin_only
1253   * @exclusive:  This parameter only has an affect in cluster-context.
1254   *              It forces local target type to be used (instead of
1255   *              cluster-aware type).
1256   * @error_if_not_active
1257   */
1258 static int _lv_resume(struct cmd_context *cmd, const char *lvid_s,
1259                       struct lv_activate_opts *laopts, int error_if_not_active)
1260 {
1261         struct logical_volume *lv;
1262         struct lvinfo info;
1263         int r = 0;
1264
1265         if (!activation())
1266                 return 1;
1267
1268         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1269                 goto_out;
1270
1271         if (!lv_is_origin(lv))
1272                 laopts->origin_only = 0;
1273
1274         if (test_mode()) {
1275                 _skip("Resuming %s%s.", lv->name, laopts->origin_only ? " without snapshots" : "");
1276                 r = 1;
1277                 goto out;
1278         }
1279
1280         log_debug("Resuming LV %s/%s%s%s.", lv->vg->name, lv->name,
1281                   error_if_not_active ? "" : " if active",
1282                   laopts->origin_only ? " without snapshots" : "");
1283
1284         if (!lv_info(cmd, lv, laopts->origin_only, &info, 0, 0))
1285                 goto_out;
1286
1287         if (!info.exists || !info.suspended) {
1288                 if (error_if_not_active)
1289                         goto_out;
1290                 r = 1;
1291                 if (!info.suspended)
1292                         critical_section_dec(cmd, "already resumed");
1293                 goto out;
1294         }
1295
1296         if (!_lv_activate_lv(lv, laopts))
1297                 goto_out;
1298
1299         critical_section_dec(cmd, "resumed");
1300
1301         if (!monitor_dev_for_events(cmd, lv, laopts, 1))
1302                 stack;
1303
1304         r = 1;
1305 out:
1306         if (lv)
1307                 free_vg(lv->vg);
1308
1309         return r;
1310 }
1311
1312 /* Returns success if the device is not active */
1313 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s,
1314                         unsigned origin_only, unsigned exclusive)
1315 {
1316         struct lv_activate_opts laopts = {
1317                 .origin_only = origin_only,
1318                 /*
1319                  * When targets are activated exclusively in a cluster, the
1320                  * non-clustered target should be used.  This only happens
1321                  * if exclusive is set.
1322                  */
1323                 .exclusive = exclusive
1324         };
1325
1326         return _lv_resume(cmd, lvid_s, &laopts, 0);
1327 }
1328
1329 int lv_resume(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1330 {
1331         struct lv_activate_opts laopts = { .origin_only = origin_only, };
1332
1333         return _lv_resume(cmd, lvid_s, &laopts, 1);
1334 }
1335
1336 static int _lv_has_open_snapshots(struct logical_volume *lv)
1337 {
1338         struct lv_segment *snap_seg;
1339         struct lvinfo info;
1340         int r = 0;
1341
1342         dm_list_iterate_items_gen(snap_seg, &lv->snapshot_segs, origin_list) {
1343                 if (!lv_info(lv->vg->cmd, snap_seg->cow, 0, &info, 1, 0)) {
1344                         r = 1;
1345                         continue;
1346                 }
1347
1348                 if (info.exists && info.open_count) {
1349                         log_error("LV %s/%s has open snapshot %s: "
1350                                   "not deactivating", lv->vg->name, lv->name,
1351                                   snap_seg->cow->name);
1352                         r = 1;
1353                 }
1354         }
1355
1356         return r;
1357 }
1358
1359 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
1360 {
1361         struct logical_volume *lv;
1362         struct lvinfo info;
1363         int r = 0;
1364
1365         if (!activation())
1366                 return 1;
1367
1368         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1369                 goto out;
1370
1371         if (test_mode()) {
1372                 _skip("Deactivating '%s'.", lv->name);
1373                 r = 1;
1374                 goto out;
1375         }
1376
1377         log_debug("Deactivating %s/%s.", lv->vg->name, lv->name);
1378
1379         if (!lv_info(cmd, lv, 0, &info, 1, 0))
1380                 goto_out;
1381
1382         if (!info.exists) {
1383                 r = 1;
1384                 goto out;
1385         }
1386
1387         if (lv_is_visible(lv)) {
1388                 if (info.open_count) {
1389                         log_error("LV %s/%s in use: not deactivating",
1390                                   lv->vg->name, lv->name);
1391                         goto out;
1392                 }
1393                 if (lv_is_origin(lv) && _lv_has_open_snapshots(lv))
1394                         goto_out;
1395         }
1396
1397         if (!lv_read_replicator_vgs(lv))
1398                 goto_out;
1399
1400         lv_calculate_readahead(lv, NULL);
1401
1402         if (!monitor_dev_for_events(cmd, lv, NULL, 0))
1403                 stack;
1404
1405         critical_section_inc(cmd, "deactivating");
1406         r = _lv_deactivate(lv);
1407         critical_section_dec(cmd, "deactivated");
1408
1409         if (!lv_info(cmd, lv, 0, &info, 0, 0) || info.exists)
1410                 r = 0;
1411 out:
1412         if (lv) {
1413                 lv_release_replicator_vgs(lv);
1414                 free_vg(lv->vg);
1415         }
1416
1417         return r;
1418 }
1419
1420 /* Test if LV passes filter */
1421 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
1422                          int *activate_lv)
1423 {
1424         struct logical_volume *lv;
1425         int r = 0;
1426
1427         if (!activation()) {
1428                 *activate_lv = 1;
1429                 return 1;
1430         }
1431
1432         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1433                 goto out;
1434
1435         if (!_passes_activation_filter(cmd, lv)) {
1436                 log_verbose("Not activating %s/%s since it does not pass "
1437                             "activation filter.", lv->vg->name, lv->name);
1438                 *activate_lv = 0;
1439         } else
1440                 *activate_lv = 1;
1441         r = 1;
1442 out:
1443         if (lv)
1444                 free_vg(lv->vg);
1445
1446         return r;
1447 }
1448
1449 static int _lv_activate(struct cmd_context *cmd, const char *lvid_s,
1450                         struct lv_activate_opts *laopts, int filter)
1451 {
1452         struct logical_volume *lv;
1453         struct lvinfo info;
1454         int r = 0;
1455
1456         if (!activation())
1457                 return 1;
1458
1459         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1460                 goto out;
1461
1462         if (filter && !_passes_activation_filter(cmd, lv)) {
1463                 log_error("Not activating %s/%s since it does not pass "
1464                           "activation filter.", lv->vg->name, lv->name);
1465                 goto out;
1466         }
1467
1468         if ((!lv->vg->cmd->partial_activation) && (lv->status & PARTIAL_LV)) {
1469                 log_error("Refusing activation of partial LV %s. Use --partial to override.",
1470                           lv->name);
1471                 goto_out;
1472         }
1473
1474         if (lv_has_unknown_segments(lv)) {
1475                 log_error("Refusing activation of LV %s containing "
1476                           "an unrecognised segment.", lv->name);
1477                 goto_out;
1478         }
1479
1480         if (test_mode()) {
1481                 _skip("Activating '%s'.", lv->name);
1482                 r = 1;
1483                 goto out;
1484         }
1485
1486         log_debug("Activating %s/%s%s.", lv->vg->name, lv->name,
1487                   laopts->exclusive ? " exclusively" : "");
1488
1489         if (!lv_info(cmd, lv, 0, &info, 0, 0))
1490                 goto_out;
1491
1492         if (info.exists && !info.suspended && info.live_table) {
1493                 r = 1;
1494                 goto out;
1495         }
1496
1497         if (!lv_read_replicator_vgs(lv))
1498                 goto_out;
1499
1500         lv_calculate_readahead(lv, NULL);
1501
1502         critical_section_inc(cmd, "activating");
1503         if (!(r = _lv_activate_lv(lv, laopts)))
1504                 stack;
1505         critical_section_dec(cmd, "activated");
1506
1507         if (r && !monitor_dev_for_events(cmd, lv, laopts, 1))
1508                 stack;
1509
1510 out:
1511         if (lv) {
1512                 lv_release_replicator_vgs(lv);
1513                 free_vg(lv->vg);
1514         }
1515
1516         return r;
1517 }
1518
1519 /* Activate LV */
1520 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1521 {
1522         struct lv_activate_opts laopts = { .exclusive = exclusive };
1523
1524         if (!_lv_activate(cmd, lvid_s, &laopts, 0))
1525                 return_0;
1526
1527         return 1;
1528 }
1529
1530 /* Activate LV only if it passes filter */
1531 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1532 {
1533         struct lv_activate_opts laopts = { .exclusive = exclusive };
1534
1535         if (!_lv_activate(cmd, lvid_s, &laopts, 1))
1536                 return_0;
1537
1538         return 1;
1539 }
1540
1541 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
1542 {
1543         int r = 1;
1544
1545         if (!lv) {
1546                 r = dm_mknodes(NULL);
1547                 fs_unlock();
1548                 return r;
1549         }
1550
1551         if (!activation())
1552                 return 1;
1553
1554         r = dev_manager_mknodes(lv);
1555
1556         fs_unlock();
1557
1558         return r;
1559 }
1560
1561 /*
1562  * Does PV use VG somewhere in its construction?
1563  * Returns 1 on failure.
1564  */
1565 int pv_uses_vg(struct physical_volume *pv,
1566                struct volume_group *vg)
1567 {
1568         if (!activation())
1569                 return 0;
1570
1571         if (!dm_is_dm_major(MAJOR(pv->dev->dev)))
1572                 return 0;
1573
1574         return dev_manager_device_uses_vg(pv->dev, vg);
1575 }
1576
1577 void activation_release(void)
1578 {
1579         dev_manager_release();
1580 }
1581
1582 void activation_exit(void)
1583 {
1584         dev_manager_exit();
1585 }
1586 #endif