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 int lv_is_active_but_not_locally(struct logical_volume *lv)
 827 {
 828         int l;
 829         return _lv_is_active(lv, &l, NULL) && !l;
 830 }
 831
 832 int lv_is_active_exclusive_locally(struct logical_volume *lv)
 833 {
 834         int l, e;
 835
 836         return _lv_is_active(lv, &l, &e) && l && e;
 837 }
 838
 839 int lv_is_active_exclusive_remotely(struct logical_volume *lv)
 840 {
 841         int l, e;
 842
 843         return _lv_is_active(lv, &l, &e) && !l && e;
 844 }
 845
 846 #ifdef DMEVENTD
 847 static struct dm_event_handler *_create_dm_event_handler(struct cmd_context *cmd, const char *dmuuid, const char *dso,
 848                                                          const int timeout, enum dm_event_mask mask)
 849 {
 850         struct dm_event_handler *dmevh;
 851
 852         if (!(dmevh = dm_event_handler_create()))
 853                 return_NULL;
 854
 855         if (dm_event_handler_set_dmeventd_path(dmevh, find_config_tree_str(cmd, "dmeventd/executable", NULL)))
 856                 goto_bad;
 857
 858         if (dm_event_handler_set_dso(dmevh, dso))
 859                 goto_bad;
 860
 861         if (dm_event_handler_set_uuid(dmevh, dmuuid))
 862                 goto_bad;
 863
 864         dm_event_handler_set_timeout(dmevh, timeout);
 865         dm_event_handler_set_event_mask(dmevh, mask);
 866
 867         return dmevh;
 868
 869 bad:
 870         dm_event_handler_destroy(dmevh);
 871         return NULL;
 872 }
 873
 874 char *get_monitor_dso_path(struct cmd_context *cmd, const char *libpath)
 875 {
 876         char *path;
 877
 878         if (!(path = dm_pool_alloc(cmd->mem, PATH_MAX))) {
 879                 log_error("Failed to allocate dmeventd library path.");
 880                 return NULL;
 881         }
 882
 883         get_shared_library_path(cmd, libpath, path, PATH_MAX);
 884
 885         return path;
 886 }
 887
 888 int target_registered_with_dmeventd(struct cmd_context *cmd, const char *dso,
 889                                     struct logical_volume *lv, int *pending)
 890 {
 891         char *uuid;
 892         enum dm_event_mask evmask = 0;
 893         struct dm_event_handler *dmevh;
 894
 895         *pending = 0;
 896
 897         if (!dso)
 898                 return_0;
 899
 900         /* We always monitor the "real" device, never the "snapshot-origin" itself. */
 901         if (!(uuid = build_dm_uuid(cmd->mem, lv->lvid.s, lv_is_origin(lv) ? "real" : NULL)))
 902                 return_0;
 903
 904         if (!(dmevh = _create_dm_event_handler(cmd, uuid, dso, 0, DM_EVENT_ALL_ERRORS)))
 905                 return_0;
 906
 907         if (dm_event_get_registered_device(dmevh, 0)) {
 908                 dm_event_handler_destroy(dmevh);
 909                 return 0;
 910         }
 911
 912         evmask = dm_event_handler_get_event_mask(dmevh);
 913         if (evmask & DM_EVENT_REGISTRATION_PENDING) {
 914                 *pending = 1;
 915                 evmask &= ~DM_EVENT_REGISTRATION_PENDING;
 916         }
 917
 918         dm_event_handler_destroy(dmevh);
 919
 920         return evmask;
 921 }
 922
 923 int target_register_events(struct cmd_context *cmd, const char *dso, struct logical_volume *lv,
 924                             int evmask __attribute__((unused)), int set, int timeout)
 925 {
 926         char *uuid;
 927         struct dm_event_handler *dmevh;
 928         int r;
 929
 930         if (!dso)
 931                 return_0;
 932
 933         /* We always monitor the "real" device, never the "snapshot-origin" itself. */
 934         if (!(uuid = build_dm_uuid(cmd->mem, lv->lvid.s, lv_is_origin(lv) ? "real" : NULL)))
 935                 return_0;
 936
 937         if (!(dmevh = _create_dm_event_handler(cmd, uuid, dso, timeout,
 938                                                DM_EVENT_ALL_ERRORS | (timeout ? DM_EVENT_TIMEOUT : 0))))
 939                 return_0;
 940
 941         r = set ? dm_event_register_handler(dmevh) : dm_event_unregister_handler(dmevh);
 942
 943         dm_event_handler_destroy(dmevh);
 944
 945         if (!r)
 946                 return_0;
 947
 948         log_info("%s %s for events", set ? "Monitored" : "Unmonitored", uuid);
 949
 950         return 1;
 951 }
 952
 953 #endif
 954
 955 /*
 956  * Returns 0 if an attempt to (un)monitor the device failed.
 957  * Returns 1 otherwise.
 958  */
 959 int monitor_dev_for_events(struct cmd_context *cmd, struct logical_volume *lv,
 960                            const struct lv_activate_opts *laopts, int monitor)
 961 {
 962 #ifdef DMEVENTD
 963         int i, pending = 0, monitored;
 964         int r = 1;
 965         struct dm_list *tmp, *snh, *snht;
 966         struct lv_segment *seg;
 967         struct lv_segment *log_seg;
 968         int (*monitor_fn) (struct lv_segment *s, int e);
 969         uint32_t s;
 970         static const struct lv_activate_opts zlaopts = { 0 };
 971
 972         if (!laopts)
 973                 laopts = &zlaopts;
 974
 975         /* skip dmeventd code altogether */
 976         if (dmeventd_monitor_mode() == DMEVENTD_MONITOR_IGNORE)
 977                 return 1;
 978
 979         /*
 980          * Nothing to do if dmeventd configured not to be used.
 981          */
 982         if (monitor && !dmeventd_monitor_mode())
 983                 return 1;
 984
 985         /*
 986          * In case of a snapshot device, we monitor lv->snapshot->lv,
 987          * not the actual LV itself.
 988          */
 989         if (lv_is_cow(lv) && (laopts->no_merging || !lv_is_merging_cow(lv)))
 990                 return monitor_dev_for_events(cmd, lv->snapshot->lv, NULL, monitor);
 991
 992         /*
 993          * In case this LV is a snapshot origin, we instead monitor
 994          * each of its respective snapshots.  The origin itself may
 995          * also need to be monitored if it is a mirror, for example.
 996          */
 997         if (!laopts->origin_only && lv_is_origin(lv))
 998                 dm_list_iterate_safe(snh, snht, &lv->snapshot_segs)
 999                         if (!monitor_dev_for_events(cmd, dm_list_struct_base(snh,
1000                                     struct lv_segment, origin_list)->cow, NULL, monitor))
1001                                 r = 0;
1002
1003         /*
1004          * If the volume is mirrored and its log is also mirrored, monitor
1005          * the log volume as well.
1006          */
1007         if ((seg = first_seg(lv)) != NULL && seg->log_lv != NULL &&
1008             (log_seg = first_seg(seg->log_lv)) != NULL &&
1009             seg_is_mirrored(log_seg))
1010                 if (!monitor_dev_for_events(cmd, seg->log_lv, NULL, monitor))
1011                         r = 0;
1012
1013         dm_list_iterate(tmp, &lv->segments) {
1014                 seg = dm_list_item(tmp, struct lv_segment);
1015
1016                 /* Recurse for AREA_LV */
1017                 for (s = 0; s < seg->area_count; s++) {
1018                         if (seg_type(seg, s) != AREA_LV)
1019                                 continue;
1020                         if (!monitor_dev_for_events(cmd, seg_lv(seg, s), NULL,
1021                                                     monitor)) {
1022                                 log_error("Failed to %smonitor %s",
1023                                           monitor ? "" : "un",
1024                                           seg_lv(seg, s)->name);
1025                                 r = 0;
1026                         }
1027                 }
1028
1029                 if (!seg_monitored(seg) || (seg->status & PVMOVE))
1030                         continue;
1031
1032                 monitor_fn = NULL;
1033
1034                 /* Check monitoring status */
1035                 if (seg->segtype->ops->target_monitored)
1036                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
1037                 else
1038                         continue;  /* segtype doesn't support registration */
1039
1040                 /*
1041                  * FIXME: We should really try again if pending
1042                  */
1043                 monitored = (pending) ? 0 : monitored;
1044
1045                 if (monitor) {
1046                         if (monitored)
1047                                 log_verbose("%s/%s already monitored.", lv->vg->name, lv->name);
1048                         else if (seg->segtype->ops->target_monitor_events)
1049                                 monitor_fn = seg->segtype->ops->target_monitor_events;
1050                 } else {
1051                         if (!monitored)
1052                                 log_verbose("%s/%s already not monitored.", lv->vg->name, lv->name);
1053                         else if (seg->segtype->ops->target_unmonitor_events)
1054                                 monitor_fn = seg->segtype->ops->target_unmonitor_events;
1055                 }
1056
1057                 /* Do [un]monitor */
1058                 if (!monitor_fn)
1059                         continue;
1060
1061                 log_verbose("%sonitoring %s/%s%s", monitor ? "M" : "Not m", lv->vg->name, lv->name,
1062                             test_mode() ? " [Test mode: skipping this]" : "");
1063
1064                 /* FIXME Test mode should really continue a bit further. */
1065                 if (test_mode())
1066                         continue;
1067
1068                 /* FIXME specify events */
1069                 if (!monitor_fn(seg, 0)) {
1070                         log_error("%s/%s: %s segment monitoring function failed.",
1071                                   lv->vg->name, lv->name, seg->segtype->name);
1072                         return 0;
1073                 }
1074
1075                 /* Check [un]monitor results */
1076                 /* Try a couple times if pending, but not forever... */
1077                 for (i = 0; i < 10; i++) {
1078                         pending = 0;
1079                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
1080                         if (pending ||
1081                             (!monitored && monitor) ||
1082                             (monitored && !monitor))
1083                                 log_very_verbose("%s/%s %smonitoring still pending: waiting...",
1084                                                  lv->vg->name, lv->name, monitor ? "" : "un");
1085                         else
1086                                 break;
1087                         sleep(1);
1088                 }
1089
1090                 if (r)
1091                         r = (monitored && monitor) || (!monitored && !monitor);
1092         }
1093
1094         return r;
1095 #else
1096         return 1;
1097 #endif
1098 }
1099
1100 struct detached_lv_data {
1101         struct logical_volume *lv_pre;
1102         struct lv_activate_opts *laopts;
1103         int *flush_required;
1104 };
1105
1106 static int _preload_detached_lv(struct cmd_context *cmd, struct logical_volume *lv, void *data)
1107 {
1108         struct detached_lv_data *detached = data;
1109         struct lv_list *lvl_pre;
1110
1111         if ((lvl_pre = find_lv_in_vg(detached->lv_pre->vg, lv->name))) {
1112                 if (lv_is_visible(lvl_pre->lv) && lv_is_active(lv) &&
1113                     !_lv_preload(lvl_pre->lv, detached->laopts, detached->flush_required))
1114                         return_0;
1115         }
1116
1117         return 1;
1118 }
1119
1120 static int _lv_suspend(struct cmd_context *cmd, const char *lvid_s,
1121                        struct lv_activate_opts *laopts, int error_if_not_suspended)
1122 {
1123         struct logical_volume *lv = NULL, *lv_pre = NULL, *pvmove_lv = NULL;
1124         struct lv_list *lvl_pre;
1125         struct seg_list *sl;
1126         struct lvinfo info;
1127         int r = 0, lockfs = 0, flush_required = 0;
1128         struct detached_lv_data detached;
1129
1130         if (!activation())
1131                 return 1;
1132
1133         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1134                 goto_out;
1135
1136         /* Use precommitted metadata if present */
1137         if (!(lv_pre = lv_from_lvid(cmd, lvid_s, 1)))
1138                 goto_out;
1139
1140         /* Ignore origin_only unless LV is origin in both old and new metadata */
1141         if (!lv_is_origin(lv) || !lv_is_origin(lv_pre))
1142                 laopts->origin_only = 0;
1143
1144         if (test_mode()) {
1145                 _skip("Suspending %s%s.", lv->name, laopts->origin_only ? " origin without snapshots" : "");
1146                 r = 1;
1147                 goto out;
1148         }
1149
1150         if (!lv_info(cmd, lv, laopts->origin_only, &info, 0, 0))
1151                 goto_out;
1152
1153         if (!info.exists || info.suspended) {
1154                 if (!error_if_not_suspended) {
1155                         r = 1;
1156                         if (info.suspended)
1157                                 critical_section_inc(cmd, "already suspended");
1158                 }
1159                 goto out;
1160         }
1161
1162         if (!lv_read_replicator_vgs(lv))
1163                 goto_out;
1164
1165         lv_calculate_readahead(lv, NULL);
1166
1167         /*
1168          * If VG was precommitted, preload devices for the LV.
1169          * If the PVMOVE LV is being removed, it's only present in the old
1170          * metadata and not the new, so we must explicitly add the new
1171          * tables for all the changed LVs here, as the relationships
1172          * are not found by walking the new metadata.
1173          */
1174         if ((lv_pre->vg->status & PRECOMMITTED)) {
1175                 if (!(lv_pre->status & LOCKED) &&
1176                     (lv->status & LOCKED) &&
1177                     (pvmove_lv = find_pvmove_lv_in_lv(lv))) {
1178                         /* Preload all the LVs above the PVMOVE LV */
1179                         dm_list_iterate_items(sl, &pvmove_lv->segs_using_this_lv) {
1180                                 if (!(lvl_pre = find_lv_in_vg(lv_pre->vg, sl->seg->lv->name))) {
1181                                         /* FIXME Internal error? */
1182                                         log_error("LV %s missing from preload metadata", sl->seg->lv->name);
1183                                         goto out;
1184                                 }
1185                                 if (!_lv_preload(lvl_pre->lv, laopts, &flush_required))
1186                                         goto_out;
1187                         }
1188                         /* Now preload the PVMOVE LV itself */
1189                         if (!(lvl_pre = find_lv_in_vg(lv_pre->vg, pvmove_lv->name))) {
1190                                 /* FIXME Internal error? */
1191                                 log_error("LV %s missing from preload metadata", pvmove_lv->name);
1192                                 goto out;
1193                         }
1194                         if (!_lv_preload(lvl_pre->lv, laopts, &flush_required))
1195                                 goto_out;
1196                 } else {
1197                         if (!_lv_preload(lv_pre, laopts, &flush_required))
1198                                 /* FIXME Revert preloading */
1199                                 goto_out;
1200
1201                         /*
1202                          * Search for existing LVs that have become detached and preload them.
1203                          */
1204                         detached.lv_pre = lv_pre;
1205                         detached.laopts = laopts;
1206                         detached.flush_required = &flush_required;
1207
1208                         if (!for_each_sub_lv(cmd, lv, &_preload_detached_lv, &detached))
1209                                 goto_out;
1210                 }
1211         }
1212
1213         if (!monitor_dev_for_events(cmd, lv, laopts, 0))
1214                 /* FIXME Consider aborting here */
1215                 stack;
1216
1217         critical_section_inc(cmd, "suspending");
1218         if (pvmove_lv)
1219                 critical_section_inc(cmd, "suspending pvmove LV");
1220
1221         if (!laopts->origin_only &&
1222             (lv_is_origin(lv_pre) || lv_is_cow(lv_pre)))
1223                 lockfs = 1;
1224
1225         /*
1226          * Suspending an LV directly above a PVMOVE LV also
1227          * suspends other LVs using that same PVMOVE LV.
1228          * FIXME Remove this and delay the 'clear node' until
1229          * after the code knows whether there's a different
1230          * inactive table to load or not instead so lv_suspend
1231          * can be called separately for each LV safely.
1232          */
1233         if ((lv_pre->vg->status & PRECOMMITTED) &&
1234             (lv_pre->status & LOCKED) && find_pvmove_lv_in_lv(lv_pre)) {
1235                 if (!_lv_suspend_lv(lv_pre, laopts, lockfs, flush_required)) {
1236                         critical_section_dec(cmd, "failed precommitted suspend");
1237                         if (pvmove_lv)
1238                                 critical_section_dec(cmd, "failed precommitted suspend (pvmove)");
1239                         goto_out;
1240                 }
1241         } else {
1242                 /* Normal suspend */
1243                 if (!_lv_suspend_lv(lv, laopts, lockfs, flush_required)) {
1244                         critical_section_dec(cmd, "failed suspend");
1245                         if (pvmove_lv)
1246                                 critical_section_dec(cmd, "failed suspend (pvmove)");
1247                         goto_out;
1248                 }
1249         }
1250
1251         r = 1;
1252 out:
1253         if (lv_pre)
1254                 free_vg(lv_pre->vg);
1255         if (lv) {
1256                 lv_release_replicator_vgs(lv);
1257                 free_vg(lv->vg);
1258         }
1259
1260         return r;
1261 }
1262
1263 /* Returns success if the device is not active */
1264 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1265 {
1266         struct lv_activate_opts laopts = { .origin_only = origin_only };
1267
1268         return _lv_suspend(cmd, lvid_s, &laopts, 0);
1269 }
1270
1271 /* No longer used */
1272 /***********
1273 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
1274 {
1275         return _lv_suspend(cmd, lvid_s, 1);
1276 }
1277 ***********/
1278
1279  /*
1280   * _lv_resume
1281   * @cmd
1282   * @lvid_s
1283   * @origin_only
1284   * @exclusive:  This parameter only has an affect in cluster-context.
1285   *              It forces local target type to be used (instead of
1286   *              cluster-aware type).
1287   * @error_if_not_active
1288   */
1289 static int _lv_resume(struct cmd_context *cmd, const char *lvid_s,
1290                       struct lv_activate_opts *laopts, int error_if_not_active)
1291 {
1292         struct logical_volume *lv;
1293         struct lvinfo info;
1294         int r = 0;
1295
1296         if (!activation())
1297                 return 1;
1298
1299         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1300                 goto_out;
1301
1302         if (!lv_is_origin(lv))
1303                 laopts->origin_only = 0;
1304
1305         if (test_mode()) {
1306                 _skip("Resuming %s%s.", lv->name, laopts->origin_only ? " without snapshots" : "");
1307                 r = 1;
1308                 goto out;
1309         }
1310
1311         log_debug("Resuming LV %s/%s%s%s.", lv->vg->name, lv->name,
1312                   error_if_not_active ? "" : " if active",
1313                   laopts->origin_only ? " without snapshots" : "");
1314
1315         if (!lv_info(cmd, lv, laopts->origin_only, &info, 0, 0))
1316                 goto_out;
1317
1318         if (!info.exists || !info.suspended) {
1319                 if (error_if_not_active)
1320                         goto_out;
1321                 r = 1;
1322                 if (!info.suspended)
1323                         critical_section_dec(cmd, "already resumed");
1324                 goto out;
1325         }
1326
1327         if (!_lv_activate_lv(lv, laopts))
1328                 goto_out;
1329
1330         critical_section_dec(cmd, "resumed");
1331
1332         if (!monitor_dev_for_events(cmd, lv, laopts, 1))
1333                 stack;
1334
1335         r = 1;
1336 out:
1337         if (lv)
1338                 free_vg(lv->vg);
1339
1340         return r;
1341 }
1342
1343 /* Returns success if the device is not active */
1344 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s,
1345                         unsigned origin_only, unsigned exclusive)
1346 {
1347         struct lv_activate_opts laopts = {
1348                 .origin_only = origin_only,
1349                 /*
1350                  * When targets are activated exclusively in a cluster, the
1351                  * non-clustered target should be used.  This only happens
1352                  * if exclusive is set.
1353                  */
1354                 .exclusive = exclusive
1355         };
1356
1357         return _lv_resume(cmd, lvid_s, &laopts, 0);
1358 }
1359
1360 int lv_resume(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1361 {
1362         struct lv_activate_opts laopts = { .origin_only = origin_only, };
1363
1364         return _lv_resume(cmd, lvid_s, &laopts, 1);
1365 }
1366
1367 static int _lv_has_open_snapshots(struct logical_volume *lv)
1368 {
1369         struct lv_segment *snap_seg;
1370         struct lvinfo info;
1371         int r = 0;
1372
1373         dm_list_iterate_items_gen(snap_seg, &lv->snapshot_segs, origin_list) {
1374                 if (!lv_info(lv->vg->cmd, snap_seg->cow, 0, &info, 1, 0)) {
1375                         r = 1;
1376                         continue;
1377                 }
1378
1379                 if (info.exists && info.open_count) {
1380                         log_error("LV %s/%s has open snapshot %s: "
1381                                   "not deactivating", lv->vg->name, lv->name,
1382                                   snap_seg->cow->name);
1383                         r = 1;
1384                 }
1385         }
1386
1387         return r;
1388 }
1389
1390 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
1391 {
1392         struct logical_volume *lv;
1393         struct lvinfo info;
1394         int r = 0;
1395
1396         if (!activation())
1397                 return 1;
1398
1399         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1400                 goto out;
1401
1402         if (test_mode()) {
1403                 _skip("Deactivating '%s'.", lv->name);
1404                 r = 1;
1405                 goto out;
1406         }
1407
1408         log_debug("Deactivating %s/%s.", lv->vg->name, lv->name);
1409
1410         if (!lv_info(cmd, lv, 0, &info, 1, 0))
1411                 goto_out;
1412
1413         if (!info.exists) {
1414                 r = 1;
1415                 goto out;
1416         }
1417
1418         if (lv_is_visible(lv)) {
1419                 if (info.open_count) {
1420                         log_error("LV %s/%s in use: not deactivating",
1421                                   lv->vg->name, lv->name);
1422                         goto out;
1423                 }
1424                 if (lv_is_origin(lv) && _lv_has_open_snapshots(lv))
1425                         goto_out;
1426         }
1427
1428         if (!lv_read_replicator_vgs(lv))
1429                 goto_out;
1430
1431         lv_calculate_readahead(lv, NULL);
1432
1433         if (!monitor_dev_for_events(cmd, lv, NULL, 0))
1434                 stack;
1435
1436         critical_section_inc(cmd, "deactivating");
1437         r = _lv_deactivate(lv);
1438         critical_section_dec(cmd, "deactivated");
1439
1440         if (!lv_info(cmd, lv, 0, &info, 0, 0) || info.exists)
1441                 r = 0;
1442 out:
1443         if (lv) {
1444                 lv_release_replicator_vgs(lv);
1445                 free_vg(lv->vg);
1446         }
1447
1448         return r;
1449 }
1450
1451 /* Test if LV passes filter */
1452 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
1453                          int *activate_lv)
1454 {
1455         struct logical_volume *lv;
1456         int r = 0;
1457
1458         if (!activation()) {
1459                 *activate_lv = 1;
1460                 return 1;
1461         }
1462
1463         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1464                 goto out;
1465
1466         if (!_passes_activation_filter(cmd, lv)) {
1467                 log_verbose("Not activating %s/%s since it does not pass "
1468                             "activation filter.", lv->vg->name, lv->name);
1469                 *activate_lv = 0;
1470         } else
1471                 *activate_lv = 1;
1472         r = 1;
1473 out:
1474         if (lv)
1475                 free_vg(lv->vg);
1476
1477         return r;
1478 }
1479
1480 static int _lv_activate(struct cmd_context *cmd, const char *lvid_s,
1481                         struct lv_activate_opts *laopts, int filter)
1482 {
1483         struct logical_volume *lv;
1484         struct lvinfo info;
1485         int r = 0;
1486
1487         if (!activation())
1488                 return 1;
1489
1490         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1491                 goto out;
1492
1493         if (filter && !_passes_activation_filter(cmd, lv)) {
1494                 log_error("Not activating %s/%s since it does not pass "
1495                           "activation filter.", lv->vg->name, lv->name);
1496                 goto out;
1497         }
1498
1499         if ((!lv->vg->cmd->partial_activation) && (lv->status & PARTIAL_LV)) {
1500                 log_error("Refusing activation of partial LV %s. Use --partial to override.",
1501                           lv->name);
1502                 goto_out;
1503         }
1504
1505         if (lv_has_unknown_segments(lv)) {
1506                 log_error("Refusing activation of LV %s containing "
1507                           "an unrecognised segment.", lv->name);
1508                 goto_out;
1509         }
1510
1511         if (test_mode()) {
1512                 _skip("Activating '%s'.", lv->name);
1513                 r = 1;
1514                 goto out;
1515         }
1516
1517         log_debug("Activating %s/%s%s.", lv->vg->name, lv->name,
1518                   laopts->exclusive ? " exclusively" : "");
1519
1520         if (!lv_info(cmd, lv, 0, &info, 0, 0))
1521                 goto_out;
1522
1523         if (info.exists && !info.suspended && info.live_table) {
1524                 r = 1;
1525                 goto out;
1526         }
1527
1528         if (!lv_read_replicator_vgs(lv))
1529                 goto_out;
1530
1531         lv_calculate_readahead(lv, NULL);
1532
1533         critical_section_inc(cmd, "activating");
1534         if (!(r = _lv_activate_lv(lv, laopts)))
1535                 stack;
1536         critical_section_dec(cmd, "activated");
1537
1538         if (r && !monitor_dev_for_events(cmd, lv, laopts, 1))
1539                 stack;
1540
1541 out:
1542         if (lv) {
1543                 lv_release_replicator_vgs(lv);
1544                 free_vg(lv->vg);
1545         }
1546
1547         return r;
1548 }
1549
1550 /* Activate LV */
1551 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1552 {
1553         struct lv_activate_opts laopts = { .exclusive = exclusive };
1554
1555         if (!_lv_activate(cmd, lvid_s, &laopts, 0))
1556                 return_0;
1557
1558         return 1;
1559 }
1560
1561 /* Activate LV only if it passes filter */
1562 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1563 {
1564         struct lv_activate_opts laopts = { .exclusive = exclusive };
1565
1566         if (!_lv_activate(cmd, lvid_s, &laopts, 1))
1567                 return_0;
1568
1569         return 1;
1570 }
1571
1572 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
1573 {
1574         int r = 1;
1575
1576         if (!lv) {
1577                 r = dm_mknodes(NULL);
1578                 fs_unlock();
1579                 return r;
1580         }
1581
1582         if (!activation())
1583                 return 1;
1584
1585         r = dev_manager_mknodes(lv);
1586
1587         fs_unlock();
1588
1589         return r;
1590 }
1591
1592 /*
1593  * Does PV use VG somewhere in its construction?
1594  * Returns 1 on failure.
1595  */
1596 int pv_uses_vg(struct physical_volume *pv,
1597                struct volume_group *vg)
1598 {
1599         if (!activation())
1600                 return 0;
1601
1602         if (!dm_is_dm_major(MAJOR(pv->dev->dev)))
1603                 return 0;
1604
1605         return dev_manager_device_uses_vg(pv->dev, vg);
1606 }
1607
1608 void activation_release(void)
1609 {
1610         dev_manager_release();
1611 }
1612
1613 void activation_exit(void)
1614 {
1615         dev_manager_exit();
1616 }
1617 #endif