lib/activate/activate.c

   1 /*
   2  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   3  * Copyright (C) 2004-2012 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         static 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 lvm_dm_prefix_check(const char *sysfs_dir, int major, int minor, const char *prefix)
 151 {
 152         return 0;
 153 }
 154 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, unsigned origin_only,
 155             struct lvinfo *info, int with_open_count, int with_read_ahead)
 156 {
 157         return 0;
 158 }
 159 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 160                     unsigned origin_only,
 161                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 162 {
 163         return 0;
 164 }
 165 int lv_snapshot_percent(const struct logical_volume *lv, percent_t *percent)
 166 {
 167         return 0;
 168 }
 169 int lv_mirror_percent(struct cmd_context *cmd, const struct logical_volume *lv,
 170                       int wait, percent_t *percent, uint32_t *event_nr)
 171 {
 172         return 0;
 173 }
 174 int lvs_in_vg_activated(struct volume_group *vg)
 175 {
 176         return 0;
 177 }
 178 int lvs_in_vg_opened(const struct volume_group *vg)
 179 {
 180         return 0;
 181 }
 182 /******
 183 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
 184 {
 185         return 1;
 186 }
 187 *******/
 188 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
 189 {
 190         return 1;
 191 }
 192 int lv_resume(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
 193 {
 194         return 1;
 195 }
 196 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s,
 197                         unsigned origin_only, unsigned exclusive, unsigned revert)
 198 {
 199         return 1;
 200 }
 201 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
 202 {
 203         return 1;
 204 }
 205 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
 206                          int *activate_lv)
 207 {
 208         return 1;
 209 }
 210 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
 211 {
 212         return 1;
 213 }
 214 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
 215 {
 216         return 1;
 217 }
 218 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
 219 {
 220         return 1;
 221 }
 222 int lv_send_message(const struct logical_volume *lv, const char *message)
 223 {
 224         return 0;
 225 }
 226 int pv_uses_vg(struct physical_volume *pv,
 227                struct volume_group *vg)
 228 {
 229         return 0;
 230 }
 231 void activation_release(void)
 232 {
 233 }
 234 void activation_exit(void)
 235 {
 236 }
 237
 238 int lv_is_active(struct logical_volume *lv)
 239 {
 240         return 0;
 241 }
 242 int lv_is_active_but_not_locally(struct logical_volume *lv)
 243 {
 244         return 0;
 245 }
 246 int lv_is_active_exclusive(struct logical_volume *lv)
 247 {
 248         return 0;
 249 }
 250 int lv_is_active_exclusive_locally(struct logical_volume *lv)
 251 {
 252         return 0;
 253 }
 254 int lv_is_active_exclusive_remotely(struct logical_volume *lv)
 255 {
 256         return 0;
 257 }
 258
 259 int lv_check_transient(struct logical_volume *lv)
 260 {
 261         return 1;
 262 }
 263 int monitor_dev_for_events(struct cmd_context *cmd, struct logical_volume *lv,
 264                            struct lv_activate_opts *laopts, int monitor)
 265 {
 266         return 1;
 267 }
 268 #else                           /* DEVMAPPER_SUPPORT */
 269
 270 static int _activation = 1;
 271
 272 void set_activation(int act)
 273 {
 274         if (act == _activation)
 275                 return;
 276
 277         _activation = act;
 278         if (_activation)
 279                 log_verbose("Activation enabled. Device-mapper kernel "
 280                             "driver will be used.");
 281         else
 282                 log_warn("WARNING: Activation disabled. No device-mapper "
 283                           "interaction will be attempted.");
 284 }
 285
 286 int activation(void)
 287 {
 288         return _activation;
 289 }
 290
 291 static int _passes_volumes_filter(struct cmd_context *cmd,
 292                                   struct logical_volume *lv,
 293                                   const struct dm_config_node *cn,
 294                                   const char *config_path)
 295 {
 296         const struct dm_config_value *cv;
 297         const char *str;
 298         static char path[PATH_MAX];
 299
 300         log_verbose("%s configuration setting defined: "
 301                     "Checking the list to match %s/%s",
 302                     config_path, lv->vg->name, lv->name);
 303
 304         for (cv = cn->v; cv; cv = cv->next) {
 305                 if (cv->type != DM_CFG_STRING) {
 306                         log_error("Ignoring invalid string in config file %s",
 307                                   config_path);
 308                         continue;
 309                 }
 310                 str = cv->v.str;
 311                 if (!*str) {
 312                         log_error("Ignoring empty string in config file %s",
 313                                   config_path);
 314                         continue;
 315                 }
 316
 317
 318                 /* Tag? */
 319                 if (*str == '@') {
 320                         str++;
 321                         if (!*str) {
 322                                 log_error("Ignoring empty tag in config file "
 323                                           "%s", config_path);
 324                                 continue;
 325                         }
 326                         /* If any host tag matches any LV or VG tag, activate */
 327                         if (!strcmp(str, "*")) {
 328                                 if (str_list_match_list(&cmd->tags, &lv->tags, NULL)
 329                                     || str_list_match_list(&cmd->tags,
 330                                                            &lv->vg->tags, NULL))
 331                                             return 1;
 332                                 else
 333                                         continue;
 334                         }
 335                         /* If supplied tag matches LV or VG tag, activate */
 336                         if (str_list_match_item(&lv->tags, str) ||
 337                             str_list_match_item(&lv->vg->tags, str))
 338                                 return 1;
 339                         else
 340                                 continue;
 341                 }
 342                 if (!strchr(str, '/')) {
 343                         /* vgname supplied */
 344                         if (!strcmp(str, lv->vg->name))
 345                                 return 1;
 346                         else
 347                                 continue;
 348                 }
 349                 /* vgname/lvname */
 350                 if (dm_snprintf(path, sizeof(path), "%s/%s", lv->vg->name,
 351                                  lv->name) < 0) {
 352                         log_error("dm_snprintf error from %s/%s", lv->vg->name,
 353                                   lv->name);
 354                         continue;
 355                 }
 356                 if (!strcmp(path, str))
 357                         return 1;
 358         }
 359
 360         log_verbose("No item supplied in %s configuration setting "
 361                     "matches %s/%s", config_path, lv->vg->name, lv->name);
 362
 363         return 0;
 364 }
 365
 366 static int _passes_activation_filter(struct cmd_context *cmd,
 367                                      struct logical_volume *lv)
 368 {
 369         const struct dm_config_node *cn;
 370
 371         if (!(cn = find_config_tree_node(cmd, "activation/volume_list"))) {
 372                 log_verbose("activation/volume_list configuration setting "
 373                             "not defined: Checking only host tags for %s/%s",
 374                             lv->vg->name, lv->name);
 375
 376                 /* If no host tags defined, activate */
 377                 if (dm_list_empty(&cmd->tags))
 378                         return 1;
 379
 380                 /* If any host tag matches any LV or VG tag, activate */
 381                 if (str_list_match_list(&cmd->tags, &lv->tags, NULL) ||
 382                     str_list_match_list(&cmd->tags, &lv->vg->tags, NULL))
 383                         return 1;
 384
 385                 log_verbose("No host tag matches %s/%s",
 386                             lv->vg->name, lv->name);
 387
 388                 /* Don't activate */
 389                 return 0;
 390         }
 391
 392         return _passes_volumes_filter(cmd, lv, cn, "activation/volume_list");
 393 }
 394
 395 static int _passes_readonly_filter(struct cmd_context *cmd,
 396                                    struct logical_volume *lv)
 397 {
 398         struct dm_config_node *cn;
 399
 400         if (!(cn = find_config_tree_node(cmd, "activation/read_only_volume_list")))
 401                 return 0;
 402
 403         return _passes_volumes_filter(cmd, lv, cn, "activation/read_only_volume_list");
 404 }
 405
 406 int library_version(char *version, size_t size)
 407 {
 408         if (!activation())
 409                 return 0;
 410
 411         return dm_get_library_version(version, size);
 412 }
 413
 414 int driver_version(char *version, size_t size)
 415 {
 416         if (!activation())
 417                 return 0;
 418
 419         log_very_verbose("Getting driver version");
 420
 421         return dm_driver_version(version, size);
 422 }
 423
 424 int target_version(const char *target_name, uint32_t *maj,
 425                    uint32_t *min, uint32_t *patchlevel)
 426 {
 427         int r = 0;
 428         struct dm_task *dmt;
 429         struct dm_versions *target, *last_target;
 430
 431         log_very_verbose("Getting target version for %s", target_name);
 432         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 433                 return_0;
 434
 435         if (activation_checks() && !dm_task_enable_checks(dmt))
 436                 goto_out;
 437
 438         if (!dm_task_run(dmt)) {
 439                 log_debug("Failed to get %s target version", target_name);
 440                 /* Assume this was because LIST_VERSIONS isn't supported */
 441                 return 1;
 442         }
 443
 444         target = dm_task_get_versions(dmt);
 445
 446         do {
 447                 last_target = target;
 448
 449                 if (!strcmp(target_name, target->name)) {
 450                         r = 1;
 451                         *maj = target->version[0];
 452                         *min = target->version[1];
 453                         *patchlevel = target->version[2];
 454                         goto out;
 455                 }
 456
 457                 target = (struct dm_versions *)((char *) target + target->next);
 458         } while (last_target != target);
 459
 460       out:
 461         dm_task_destroy(dmt);
 462
 463         return r;
 464 }
 465
 466 int lvm_dm_prefix_check(int major, int minor, const char *prefix)
 467 {
 468         struct dm_task *dmt;
 469         const char *uuid;
 470         int r;
 471
 472         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 473                 return_0;
 474
 475         if (!dm_task_set_minor(dmt, minor) ||
 476             !dm_task_set_major(dmt, major) ||
 477             !dm_task_run(dmt) ||
 478             !(uuid = dm_task_get_uuid(dmt))) {
 479                 dm_task_destroy(dmt);
 480                 return 0;
 481         }
 482
 483         r = strncasecmp(uuid, prefix, strlen(prefix));
 484         dm_task_destroy(dmt);
 485
 486         return r ? 0 : 1;
 487 }
 488
 489 int module_present(struct cmd_context *cmd, const char *target_name)
 490 {
 491         int ret = 0;
 492 #ifdef MODPROBE_CMD
 493         char module[128];
 494         const char *argv[3];
 495
 496         if (dm_snprintf(module, sizeof(module), "dm-%s", target_name) < 0) {
 497                 log_error("module_present module name too long: %s",
 498                           target_name);
 499                 return 0;
 500         }
 501
 502         argv[0] = MODPROBE_CMD;
 503         argv[1] = module;
 504         argv[2] = NULL;
 505
 506         ret = exec_cmd(cmd, argv, NULL, 0);
 507 #endif
 508         return ret;
 509 }
 510
 511 int target_present(struct cmd_context *cmd, const char *target_name,
 512                    int use_modprobe)
 513 {
 514         uint32_t maj, min, patchlevel;
 515
 516         if (!activation())
 517                 return 0;
 518
 519 #ifdef MODPROBE_CMD
 520         if (use_modprobe) {
 521                 if (target_version(target_name, &maj, &min, &patchlevel))
 522                         return 1;
 523
 524                 if (!module_present(cmd, target_name))
 525                         return_0;
 526         }
 527 #endif
 528
 529         return target_version(target_name, &maj, &min, &patchlevel);
 530 }
 531
 532 /*
 533  * Returns 1 if info structure populated, else 0 on failure.
 534  */
 535 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, unsigned origin_only,
 536             struct lvinfo *info, int with_open_count, int with_read_ahead)
 537 {
 538         struct dm_info dminfo;
 539
 540         if (!activation())
 541                 return 0;
 542         /*
 543          * If open_count info is requested and we have to be sure our own udev
 544          * transactions are finished
 545          * For non-clustered locking type we are only interested for non-delete operation
 546          * in progress - as only those could lead to opened files
 547          */
 548         if (with_open_count) {
 549                 if (locking_is_clustered())
 550                         sync_local_dev_names(cmd); /* Wait to have udev in sync */
 551                 else if (fs_has_non_delete_ops())
 552                         fs_unlock(); /* For non clustered - wait if there are non-delete ops */
 553         }
 554
 555         if (!dev_manager_info(lv->vg->cmd->mem, lv, origin_only ? "real" : NULL, with_open_count,
 556                               with_read_ahead, &dminfo, &info->read_ahead))
 557                 return_0;
 558
 559         info->exists = dminfo.exists;
 560         info->suspended = dminfo.suspended;
 561         info->open_count = dminfo.open_count;
 562         info->major = dminfo.major;
 563         info->minor = dminfo.minor;
 564         info->read_only = dminfo.read_only;
 565         info->live_table = dminfo.live_table;
 566         info->inactive_table = dminfo.inactive_table;
 567
 568         return 1;
 569 }
 570
 571 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 572                     unsigned origin_only,
 573                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 574 {
 575         int r;
 576         struct logical_volume *lv;
 577
 578         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 579                 return 0;
 580
 581         if (!lv_is_origin(lv))
 582                 origin_only = 0;
 583
 584         r = lv_info(cmd, lv, origin_only, info, with_open_count, with_read_ahead);
 585         release_vg(lv->vg);
 586
 587         return r;
 588 }
 589
 590 int lv_check_not_in_use(struct cmd_context *cmd __attribute__((unused)),
 591                         struct logical_volume *lv, struct lvinfo *info)
 592 {
 593         if (!info->exists)
 594                 return 1;
 595
 596         /* If sysfs is not used, use open_count information only. */
 597         if (!*dm_sysfs_dir()) {
 598                 if (info->open_count) {
 599                         log_error("Logical volume %s/%s in use.",
 600                                   lv->vg->name, lv->name);
 601                         return 0;
 602                 }
 603
 604                 return 1;
 605         }
 606
 607         if (dm_device_has_holders(info->major, info->minor)) {
 608                 log_error("Logical volume %s/%s is used by another device.",
 609                           lv->vg->name, lv->name);
 610                 return 0;
 611         }
 612
 613         if (dm_device_has_mounted_fs(info->major, info->minor)) {
 614                 log_error("Logical volume %s/%s contains a filesystem in use.",
 615                           lv->vg->name, lv->name);
 616                 return 0;
 617         }
 618
 619         return 1;
 620 }
 621
 622 /*
 623  * Returns 1 if percent set, else 0 on failure.
 624  */
 625 int lv_check_transient(struct logical_volume *lv)
 626 {
 627         int r;
 628         struct dev_manager *dm;
 629
 630         if (!activation())
 631                 return 0;
 632
 633         log_debug("Checking transient status for LV %s/%s", lv->vg->name, lv->name);
 634
 635         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 636                 return_0;
 637
 638         if (!(r = dev_manager_transient(dm, lv)))
 639                 stack;
 640
 641         dev_manager_destroy(dm);
 642
 643         return r;
 644 }
 645
 646 /*
 647  * Returns 1 if percent set, else 0 on failure.
 648  */
 649 int lv_snapshot_percent(const struct logical_volume *lv, percent_t *percent)
 650 {
 651         int r;
 652         struct dev_manager *dm;
 653
 654         if (!activation())
 655                 return 0;
 656
 657         log_debug("Checking snapshot percent for LV %s/%s", lv->vg->name, lv->name);
 658
 659         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 660                 return_0;
 661
 662         if (!(r = dev_manager_snapshot_percent(dm, lv, percent)))
 663                 stack;
 664
 665         dev_manager_destroy(dm);
 666
 667         return r;
 668 }
 669
 670 /* FIXME Merge with snapshot_percent */
 671 int lv_mirror_percent(struct cmd_context *cmd, const struct logical_volume *lv,
 672                       int wait, percent_t *percent, uint32_t *event_nr)
 673 {
 674         int r;
 675         struct dev_manager *dm;
 676         struct lvinfo info;
 677
 678         /* If mirrored LV is temporarily shrinked to 1 area (= linear),
 679          * it should be considered in-sync. */
 680         if (dm_list_size(&lv->segments) == 1 && first_seg(lv)->area_count == 1) {
 681                 *percent = PERCENT_100;
 682                 return 1;
 683         }
 684
 685         if (!activation())
 686                 return 0;
 687
 688         log_debug("Checking mirror percent for LV %s/%s", lv->vg->name, lv->name);
 689
 690         if (!lv_info(cmd, lv, 0, &info, 0, 0))
 691                 return_0;
 692
 693         if (!info.exists)
 694                 return 0;
 695
 696         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 697                 return_0;
 698
 699         if (!(r = dev_manager_mirror_percent(dm, lv, wait, percent, event_nr)))
 700                 stack;
 701
 702         dev_manager_destroy(dm);
 703
 704         return r;
 705 }
 706
 707 int lv_raid_percent(const struct logical_volume *lv, percent_t *percent)
 708 {
 709         return lv_mirror_percent(lv->vg->cmd, lv, 0, percent, NULL);
 710 }
 711
 712 /*
 713  * Returns 1 if percent set, else 0 on failure.
 714  */
 715 int lv_thin_pool_percent(const struct logical_volume *lv, percent_t *percent)
 716 {
 717         int r;
 718         struct dev_manager *dm;
 719
 720         if (!activation())
 721                 return 0;
 722
 723         log_debug("Checking thin pool percent for LV %s/%s", lv->vg->name, lv->name);
 724
 725         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 726                 return_0;
 727
 728         if (!(r = dev_manager_thin_pool_percent(dm, lv, percent)))
 729                 stack;
 730
 731         dev_manager_destroy(dm);
 732
 733         return r;
 734 }
 735
 736 static int _lv_active(struct cmd_context *cmd, struct logical_volume *lv)
 737 {
 738         struct lvinfo info;
 739
 740         if (!lv_info(cmd, lv, 0, &info, 0, 0)) {
 741                 stack;
 742                 return -1;
 743         }
 744
 745         return info.exists;
 746 }
 747
 748 static int _lv_open_count(struct cmd_context *cmd, struct logical_volume *lv)
 749 {
 750         struct lvinfo info;
 751
 752         if (!lv_info(cmd, lv, 0, &info, 1, 0)) {
 753                 stack;
 754                 return -1;
 755         }
 756
 757         return info.open_count;
 758 }
 759
 760 static int _lv_activate_lv(struct logical_volume *lv, struct lv_activate_opts *laopts)
 761 {
 762         int r;
 763         struct dev_manager *dm;
 764
 765         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, (lv->status & PVMOVE) ? 0 : 1)))
 766                 return_0;
 767
 768         if (!(r = dev_manager_activate(dm, lv, laopts)))
 769                 stack;
 770
 771         dev_manager_destroy(dm);
 772         return r;
 773 }
 774
 775 static int _lv_preload(struct logical_volume *lv, struct lv_activate_opts *laopts,
 776                        int *flush_required)
 777 {
 778         int r = 0;
 779         struct dev_manager *dm;
 780         int old_readonly = laopts->read_only;
 781
 782         laopts->read_only = _passes_readonly_filter(lv->vg->cmd, lv);
 783
 784         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, (lv->status & PVMOVE) ? 0 : 1)))
 785                 goto_out;
 786
 787         if (!(r = dev_manager_preload(dm, lv, laopts, flush_required)))
 788                 stack;
 789
 790         dev_manager_destroy(dm);
 791
 792         laopts->read_only = old_readonly;
 793 out:
 794         return r;
 795 }
 796
 797 static int _lv_deactivate(struct logical_volume *lv)
 798 {
 799         int r;
 800         struct dev_manager *dm;
 801
 802         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
 803                 return_0;
 804
 805         if (!(r = dev_manager_deactivate(dm, lv)))
 806                 stack;
 807
 808         dev_manager_destroy(dm);
 809         return r;
 810 }
 811
 812 static int _lv_suspend_lv(struct logical_volume *lv, struct lv_activate_opts *laopts,
 813                           int lockfs, int flush_required)
 814 {
 815         int r;
 816         struct dev_manager *dm;
 817
 818         laopts->read_only = _passes_readonly_filter(lv->vg->cmd, lv);
 819
 820         /*
 821          * When we are asked to manipulate (normally suspend/resume) the PVMOVE
 822          * device directly, we don't want to touch the devices that use it.
 823          */
 824         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, (lv->status & PVMOVE) ? 0 : 1)))
 825                 return_0;
 826
 827         if (!(r = dev_manager_suspend(dm, lv, laopts, lockfs, flush_required)))
 828                 stack;
 829
 830         dev_manager_destroy(dm);
 831         return r;
 832 }
 833
 834 /*
 835  * These two functions return the number of visible LVs in the state,
 836  * or -1 on error.  FIXME Check this.
 837  */
 838 int lvs_in_vg_activated(struct volume_group *vg)
 839 {
 840         struct lv_list *lvl;
 841         int count = 0;
 842
 843         if (!activation())
 844                 return 0;
 845
 846         dm_list_iterate_items(lvl, &vg->lvs)
 847                 if (lv_is_visible(lvl->lv))
 848                         count += (_lv_active(vg->cmd, lvl->lv) == 1);
 849
 850         log_debug("Counted %d active LVs in VG %s", count, vg->name);
 851
 852         return count;
 853 }
 854
 855 int lvs_in_vg_opened(const struct volume_group *vg)
 856 {
 857         const struct lv_list *lvl;
 858         int count = 0;
 859
 860         if (!activation())
 861                 return 0;
 862
 863         dm_list_iterate_items(lvl, &vg->lvs)
 864                 if (lv_is_visible(lvl->lv))
 865                         count += (_lv_open_count(vg->cmd, lvl->lv) > 0);
 866
 867         log_debug("Counted %d open LVs in VG %s", count, vg->name);
 868
 869         return count;
 870 }
 871
 872 /*
 873  * _lv_is_active
 874  * @lv:        logical volume being queried
 875  * @locally:   set if active locally (when provided)
 876  * @exclusive: set if active exclusively (when provided)
 877  *
 878  * Determine whether an LV is active locally or in a cluster.
 879  * In addition to the return code which indicates whether or
 880  * not the LV is active somewhere, two other values are set
 881  * to yield more information about the status of the activation:
 882  *      return  locally exclusively     status
 883  *      ======  ======= ===========     ======
 884  *         0       0        0           not active
 885  *         1       0        0           active remotely
 886  *         1       0        1           exclusive remotely
 887  *         1       1        0           active locally and possibly remotely
 888  *         1       1        1           exclusive locally (or local && !cluster)
 889  * The VG lock must be held to call this function.
 890  *
 891  * Returns: 0 or 1
 892  */
 893 static int _lv_is_active(struct logical_volume *lv,
 894                          int *locally, int *exclusive)
 895 {
 896         int r, l, e; /* remote, local, and exclusive */
 897
 898         r = l = e = 0;
 899
 900         if (_lv_active(lv->vg->cmd, lv))
 901                 l = 1;
 902
 903         if (!vg_is_clustered(lv->vg)) {
 904                 e = 1;  /* exclusive by definition */
 905                 goto out;
 906         }
 907
 908         /* Active locally, and the caller doesn't care about exclusive */
 909         if (l && !exclusive)
 910                 goto out;
 911
 912         if ((r = remote_lock_held(lv->lvid.s, &e)) >= 0)
 913                 goto out;
 914
 915         /*
 916          * If lock query is not supported (due to interfacing with old
 917          * code), then we cannot evaluate exclusivity properly.
 918          *
 919          * Old users of this function will never be affected by this,
 920          * since they are only concerned about active vs. not active.
 921          * New users of this function who specifically ask for 'exclusive'
 922          * will be given an error message.
 923          */
 924         if (l) {
 925                 if (exclusive)
 926                         log_error("Unable to determine exclusivity of %s",
 927                                   lv->name);
 928                 goto out;
 929         }
 930
 931         /* FIXME: Is this fallback alright? */
 932         if (activate_lv_excl(lv->vg->cmd, lv)) {
 933                 if (!deactivate_lv(lv->vg->cmd, lv))
 934                         stack;
 935                 /* FIXME: locally & exclusive are undefined. */
 936                 return 0;
 937         }
 938         /* FIXME: Check exclusive value here. */
 939 out:
 940         if (locally)
 941                 *locally = l;
 942         if (exclusive)
 943                 *exclusive = e;
 944
 945         log_very_verbose("%s/%s is %sactive%s%s",
 946                          lv->vg->name, lv->name,
 947                          (r || l) ? "" : "not ",
 948                          (exclusive && e) ? " exclusive" : "",
 949                          e ? (l ? " locally" : " remotely") : "");
 950
 951         return r || l;
 952 }
 953
 954 int lv_is_active(struct logical_volume *lv)
 955 {
 956         return _lv_is_active(lv, NULL, NULL);
 957 }
 958
 959 int lv_is_active_but_not_locally(struct logical_volume *lv)
 960 {
 961         int l;
 962         return _lv_is_active(lv, &l, NULL) && !l;
 963 }
 964
 965 int lv_is_active_exclusive(struct logical_volume *lv)
 966 {
 967         int e;
 968
 969         return _lv_is_active(lv, NULL, &e) && e;
 970 }
 971
 972 int lv_is_active_exclusive_locally(struct logical_volume *lv)
 973 {
 974         int l, e;
 975
 976         return _lv_is_active(lv, &l, &e) && l && e;
 977 }
 978
 979 int lv_is_active_exclusive_remotely(struct logical_volume *lv)
 980 {
 981         int l, e;
 982
 983         return _lv_is_active(lv, &l, &e) && !l && e;
 984 }
 985
 986 #ifdef DMEVENTD
 987 static struct dm_event_handler *_create_dm_event_handler(struct cmd_context *cmd, const char *dmuuid, const char *dso,
 988                                                          const int timeout, enum dm_event_mask mask)
 989 {
 990         struct dm_event_handler *dmevh;
 991
 992         if (!(dmevh = dm_event_handler_create()))
 993                 return_NULL;
 994
 995         if (dm_event_handler_set_dmeventd_path(dmevh, find_config_tree_str(cmd, "dmeventd/executable", NULL)))
 996                 goto_bad;
 997
 998         if (dm_event_handler_set_dso(dmevh, dso))
 999                 goto_bad;
1000
1001         if (dm_event_handler_set_uuid(dmevh, dmuuid))
1002                 goto_bad;
1003
1004         dm_event_handler_set_timeout(dmevh, timeout);
1005         dm_event_handler_set_event_mask(dmevh, mask);
1006
1007         return dmevh;
1008
1009 bad:
1010         dm_event_handler_destroy(dmevh);
1011         return NULL;
1012 }
1013
1014 char *get_monitor_dso_path(struct cmd_context *cmd, const char *libpath)
1015 {
1016         char *path;
1017
1018         if (!(path = dm_pool_alloc(cmd->mem, PATH_MAX))) {
1019                 log_error("Failed to allocate dmeventd library path.");
1020                 return NULL;
1021         }
1022
1023         get_shared_library_path(cmd, libpath, path, PATH_MAX);
1024
1025         return path;
1026 }
1027
1028 static char *_build_target_uuid(struct cmd_context *cmd, struct logical_volume *lv)
1029 {
1030         const char *layer;
1031
1032         if (lv_is_thin_pool(lv))
1033                 layer = "tpool"; /* Monitor "tpool" for the "thin pool". */
1034         else if (lv_is_origin(lv))
1035                 layer = "real"; /* Monitor "real" for "snapshot-origin". */
1036         else
1037                 layer = NULL;
1038
1039         return build_dm_uuid(cmd->mem, lv->lvid.s, layer);
1040 }
1041
1042 int target_registered_with_dmeventd(struct cmd_context *cmd, const char *dso,
1043                                     struct logical_volume *lv, int *pending)
1044 {
1045         char *uuid;
1046         enum dm_event_mask evmask = 0;
1047         struct dm_event_handler *dmevh;
1048         *pending = 0;
1049
1050         if (!dso)
1051                 return_0;
1052
1053         if (!(uuid = _build_target_uuid(cmd, lv)))
1054                 return_0;
1055
1056         if (!(dmevh = _create_dm_event_handler(cmd, uuid, dso, 0, DM_EVENT_ALL_ERRORS)))
1057                 return_0;
1058
1059         if (dm_event_get_registered_device(dmevh, 0)) {
1060                 dm_event_handler_destroy(dmevh);
1061                 return 0;
1062         }
1063
1064         evmask = dm_event_handler_get_event_mask(dmevh);
1065         if (evmask & DM_EVENT_REGISTRATION_PENDING) {
1066                 *pending = 1;
1067                 evmask &= ~DM_EVENT_REGISTRATION_PENDING;
1068         }
1069
1070         dm_event_handler_destroy(dmevh);
1071
1072         return evmask;
1073 }
1074
1075 int target_register_events(struct cmd_context *cmd, const char *dso, struct logical_volume *lv,
1076                             int evmask __attribute__((unused)), int set, int timeout)
1077 {
1078         char *uuid;
1079         struct dm_event_handler *dmevh;
1080         int r;
1081
1082         if (!dso)
1083                 return_0;
1084
1085         /* We always monitor the "real" device, never the "snapshot-origin" itself. */
1086         if (!(uuid = _build_target_uuid(cmd, lv)))
1087                 return_0;
1088
1089         if (!(dmevh = _create_dm_event_handler(cmd, uuid, dso, timeout,
1090                                                DM_EVENT_ALL_ERRORS | (timeout ? DM_EVENT_TIMEOUT : 0))))
1091                 return_0;
1092
1093         r = set ? dm_event_register_handler(dmevh) : dm_event_unregister_handler(dmevh);
1094
1095         dm_event_handler_destroy(dmevh);
1096
1097         if (!r)
1098                 return_0;
1099
1100         log_info("%s %s for events", set ? "Monitored" : "Unmonitored", uuid);
1101
1102         return 1;
1103 }
1104
1105 #endif
1106
1107 /*
1108  * Returns 0 if an attempt to (un)monitor the device failed.
1109  * Returns 1 otherwise.
1110  */
1111 int monitor_dev_for_events(struct cmd_context *cmd, struct logical_volume *lv,
1112                            const struct lv_activate_opts *laopts, int monitor)
1113 {
1114 #ifdef DMEVENTD
1115         int i, pending = 0, monitored;
1116         int r = 1;
1117         struct dm_list *tmp, *snh, *snht;
1118         struct lv_segment *seg;
1119         struct lv_segment *log_seg;
1120         int (*monitor_fn) (struct lv_segment *s, int e);
1121         uint32_t s;
1122         static const struct lv_activate_opts zlaopts = { 0 };
1123
1124         if (!laopts)
1125                 laopts = &zlaopts;
1126
1127         /* skip dmeventd code altogether */
1128         if (dmeventd_monitor_mode() == DMEVENTD_MONITOR_IGNORE)
1129                 return 1;
1130
1131         /*
1132          * Nothing to do if dmeventd configured not to be used.
1133          */
1134         if (monitor && !dmeventd_monitor_mode())
1135                 return 1;
1136
1137         /*
1138          * In case of a snapshot device, we monitor lv->snapshot->lv,
1139          * not the actual LV itself.
1140          */
1141         if (lv_is_cow(lv) && (laopts->no_merging || !lv_is_merging_cow(lv)))
1142                 return monitor_dev_for_events(cmd, lv->snapshot->lv, NULL, monitor);
1143
1144         /*
1145          * In case this LV is a snapshot origin, we instead monitor
1146          * each of its respective snapshots.  The origin itself may
1147          * also need to be monitored if it is a mirror, for example.
1148          */
1149         if (!laopts->origin_only && lv_is_origin(lv))
1150                 dm_list_iterate_safe(snh, snht, &lv->snapshot_segs)
1151                         if (!monitor_dev_for_events(cmd, dm_list_struct_base(snh,
1152                                     struct lv_segment, origin_list)->cow, NULL, monitor))
1153                                 r = 0;
1154
1155         /*
1156          * If the volume is mirrored and its log is also mirrored, monitor
1157          * the log volume as well.
1158          */
1159         if ((seg = first_seg(lv)) != NULL && seg->log_lv != NULL &&
1160             (log_seg = first_seg(seg->log_lv)) != NULL &&
1161             seg_is_mirrored(log_seg))
1162                 if (!monitor_dev_for_events(cmd, seg->log_lv, NULL, monitor))
1163                         r = 0;
1164
1165         dm_list_iterate(tmp, &lv->segments) {
1166                 seg = dm_list_item(tmp, struct lv_segment);
1167
1168                 /* Recurse for AREA_LV */
1169                 for (s = 0; s < seg->area_count; s++) {
1170                         if (seg_type(seg, s) != AREA_LV)
1171                                 continue;
1172                         if (!monitor_dev_for_events(cmd, seg_lv(seg, s), NULL,
1173                                                     monitor)) {
1174                                 log_error("Failed to %smonitor %s",
1175                                           monitor ? "" : "un",
1176                                           seg_lv(seg, s)->name);
1177                                 r = 0;
1178                         }
1179                 }
1180
1181                 if (!seg_monitored(seg) || (seg->status & PVMOVE))
1182                         continue;
1183
1184                 monitor_fn = NULL;
1185
1186                 /* Check monitoring status */
1187                 if (seg->segtype->ops->target_monitored)
1188                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
1189                 else
1190                         continue;  /* segtype doesn't support registration */
1191
1192                 /*
1193                  * FIXME: We should really try again if pending
1194                  */
1195                 monitored = (pending) ? 0 : monitored;
1196
1197                 if (monitor) {
1198                         if (monitored)
1199                                 log_verbose("%s/%s already monitored.", lv->vg->name, lv->name);
1200                         else if (seg->segtype->ops->target_monitor_events)
1201                                 monitor_fn = seg->segtype->ops->target_monitor_events;
1202                 } else {
1203                         if (!monitored)
1204                                 log_verbose("%s/%s already not monitored.", lv->vg->name, lv->name);
1205                         else if (seg->segtype->ops->target_unmonitor_events)
1206                                 monitor_fn = seg->segtype->ops->target_unmonitor_events;
1207                 }
1208
1209                 /* Do [un]monitor */
1210                 if (!monitor_fn)
1211                         continue;
1212
1213                 log_verbose("%sonitoring %s/%s%s", monitor ? "M" : "Not m", lv->vg->name, lv->name,
1214                             test_mode() ? " [Test mode: skipping this]" : "");
1215
1216                 /* FIXME Test mode should really continue a bit further. */
1217                 if (test_mode())
1218                         continue;
1219
1220                 /* FIXME specify events */
1221                 if (!monitor_fn(seg, 0)) {
1222                         log_error("%s/%s: %s segment monitoring function failed.",
1223                                   lv->vg->name, lv->name, seg->segtype->name);
1224                         return 0;
1225                 }
1226
1227                 /* Check [un]monitor results */
1228                 /* Try a couple times if pending, but not forever... */
1229                 for (i = 0; i < 10; i++) {
1230                         pending = 0;
1231                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
1232                         if (pending ||
1233                             (!monitored && monitor) ||
1234                             (monitored && !monitor))
1235                                 log_very_verbose("%s/%s %smonitoring still pending: waiting...",
1236                                                  lv->vg->name, lv->name, monitor ? "" : "un");
1237                         else
1238                                 break;
1239                         sleep(1);
1240                 }
1241
1242                 if (r)
1243                         r = (monitored && monitor) || (!monitored && !monitor);
1244         }
1245
1246         return r;
1247 #else
1248         return 1;
1249 #endif
1250 }
1251
1252 struct detached_lv_data {
1253         struct logical_volume *lv_pre;
1254         struct lv_activate_opts *laopts;
1255         int *flush_required;
1256 };
1257
1258 static int _preload_detached_lv(struct cmd_context *cmd, struct logical_volume *lv, void *data)
1259 {
1260         struct detached_lv_data *detached = data;
1261         struct lv_list *lvl_pre;
1262
1263         if ((lvl_pre = find_lv_in_vg(detached->lv_pre->vg, lv->name))) {
1264                 if (lv_is_visible(lvl_pre->lv) && lv_is_active(lv) && (!lv_is_cow(lv) || !lv_is_cow(lvl_pre->lv)) &&
1265                     !_lv_preload(lvl_pre->lv, detached->laopts, detached->flush_required))
1266                         return_0;
1267         }
1268
1269         return 1;
1270 }
1271
1272 static int _lv_suspend(struct cmd_context *cmd, const char *lvid_s,
1273                        struct lv_activate_opts *laopts, int error_if_not_suspended)
1274 {
1275         struct logical_volume *lv = NULL, *lv_pre = NULL, *pvmove_lv = NULL;
1276         struct lv_list *lvl_pre;
1277         struct seg_list *sl;
1278         struct lv_segment *snap_seg;
1279         struct lvinfo info;
1280         int r = 0, lockfs = 0, flush_required = 0;
1281         struct detached_lv_data detached;
1282
1283         if (!activation())
1284                 return 1;
1285
1286         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1287                 goto_out;
1288
1289         /* Use precommitted metadata if present */
1290         if (!(lv_pre = lv_from_lvid(cmd, lvid_s, 1)))
1291                 goto_out;
1292
1293         /* Ignore origin_only unless LV is origin in both old and new metadata */
1294         if (!lv_is_origin(lv) || !lv_is_origin(lv_pre))
1295                 laopts->origin_only = 0;
1296
1297         if (test_mode()) {
1298                 _skip("Suspending %s%s.", lv->name, laopts->origin_only ? " origin without snapshots" : "");
1299                 r = 1;
1300                 goto out;
1301         }
1302
1303         if (!lv_info(cmd, lv, laopts->origin_only, &info, 0, 0))
1304                 goto_out;
1305
1306         if (!info.exists || info.suspended) {
1307                 if (!error_if_not_suspended) {
1308                         r = 1;
1309                         if (info.suspended)
1310                                 critical_section_inc(cmd, "already suspended");
1311                 }
1312                 goto out;
1313         }
1314
1315         if (!lv_read_replicator_vgs(lv))
1316                 goto_out;
1317
1318         lv_calculate_readahead(lv, NULL);
1319
1320         /*
1321          * Preload devices for the LV.
1322          * If the PVMOVE LV is being removed, it's only present in the old
1323          * metadata and not the new, so we must explicitly add the new
1324          * tables for all the changed LVs here, as the relationships
1325          * are not found by walking the new metadata.
1326          */
1327         if (!(lv_pre->status & LOCKED) &&
1328             (lv->status & LOCKED) &&
1329             (pvmove_lv = find_pvmove_lv_in_lv(lv))) {
1330                 /* Preload all the LVs above the PVMOVE LV */
1331                 dm_list_iterate_items(sl, &pvmove_lv->segs_using_this_lv) {
1332                         if (!(lvl_pre = find_lv_in_vg(lv_pre->vg, sl->seg->lv->name))) {
1333                                 log_error(INTERNAL_ERROR "LV %s missing from preload metadata", sl->seg->lv->name);
1334                                 goto out;
1335                         }
1336                         if (!_lv_preload(lvl_pre->lv, laopts, &flush_required))
1337                                 goto_out;
1338                 }
1339                 /* Now preload the PVMOVE LV itself */
1340                 if (!(lvl_pre = find_lv_in_vg(lv_pre->vg, pvmove_lv->name))) {
1341                         log_error(INTERNAL_ERROR "LV %s missing from preload metadata", pvmove_lv->name);
1342                         goto out;
1343                 }
1344                 if (!_lv_preload(lvl_pre->lv, laopts, &flush_required))
1345                         goto_out;
1346         } else {
1347                 if (!_lv_preload(lv_pre, laopts, &flush_required))
1348                         /* FIXME Revert preloading */
1349                         goto_out;
1350
1351                 /*
1352                  * Search for existing LVs that have become detached and preload them.
1353                  */
1354                 detached.lv_pre = lv_pre;
1355                 detached.laopts = laopts;
1356                 detached.flush_required = &flush_required;
1357
1358                 if (!for_each_sub_lv(cmd, lv, &_preload_detached_lv, &detached))
1359                         goto_out;
1360
1361                 /*
1362                  * Preload any snapshots that are being removed.
1363                  */
1364                 if (!laopts->origin_only && lv_is_origin(lv)) {
1365                         dm_list_iterate_items_gen(snap_seg, &lv->snapshot_segs, origin_list) {
1366                                 if (!(lvl_pre = find_lv_in_vg_by_lvid(lv_pre->vg, &snap_seg->cow->lvid))) {
1367                                         log_error(INTERNAL_ERROR "LV %s (%s) missing from preload metadata",
1368                                                   snap_seg->cow->name, snap_seg->cow->lvid.id[1].uuid);
1369                                         goto out;
1370                                 }
1371                                 if (!lv_is_cow(lvl_pre->lv) &&
1372                                     !_lv_preload(lvl_pre->lv, laopts, &flush_required))
1373                                         goto_out;
1374                         }
1375                 }
1376         }
1377
1378         if (!monitor_dev_for_events(cmd, lv, laopts, 0))
1379                 /* FIXME Consider aborting here */
1380                 stack;
1381
1382         critical_section_inc(cmd, "suspending");
1383         if (pvmove_lv)
1384                 critical_section_inc(cmd, "suspending pvmove LV");
1385
1386         if (!laopts->origin_only &&
1387             (lv_is_origin(lv_pre) || lv_is_cow(lv_pre)))
1388                 lockfs = 1;
1389
1390         /*
1391          * Suspending an LV directly above a PVMOVE LV also
1392          * suspends other LVs using that same PVMOVE LV.
1393          * FIXME Remove this and delay the 'clear node' until
1394          * after the code knows whether there's a different
1395          * inactive table to load or not instead so lv_suspend
1396          * can be called separately for each LV safely.
1397          */
1398         if ((lv_pre->vg->status & PRECOMMITTED) &&
1399             (lv_pre->status & LOCKED) && find_pvmove_lv_in_lv(lv_pre)) {
1400                 if (!_lv_suspend_lv(lv_pre, laopts, lockfs, flush_required)) {
1401                         critical_section_dec(cmd, "failed precommitted suspend");
1402                         if (pvmove_lv)
1403                                 critical_section_dec(cmd, "failed precommitted suspend (pvmove)");
1404                         goto_out;
1405                 }
1406         } else {
1407                 /* Normal suspend */
1408                 if (!_lv_suspend_lv(lv, laopts, lockfs, flush_required)) {
1409                         critical_section_dec(cmd, "failed suspend");
1410                         if (pvmove_lv)
1411                                 critical_section_dec(cmd, "failed suspend (pvmove)");
1412                         goto_out;
1413                 }
1414         }
1415
1416         r = 1;
1417 out:
1418         if (lv_pre)
1419                 release_vg(lv_pre->vg);
1420         if (lv) {
1421                 lv_release_replicator_vgs(lv);
1422                 release_vg(lv->vg);
1423         }
1424
1425         return r;
1426 }
1427
1428 /* Returns success if the device is not active */
1429 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1430 {
1431         struct lv_activate_opts laopts = { .origin_only = origin_only };
1432
1433         return _lv_suspend(cmd, lvid_s, &laopts, 0);
1434 }
1435
1436 /* No longer used */
1437 /***********
1438 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
1439 {
1440         return _lv_suspend(cmd, lvid_s, 1);
1441 }
1442 ***********/
1443
1444  /*
1445   * _lv_resume
1446   * @cmd
1447   * @lvid_s
1448   * @origin_only
1449   * @exclusive:  This parameter only has an affect in cluster-context.
1450   *              It forces local target type to be used (instead of
1451   *              cluster-aware type).
1452   * @error_if_not_active
1453   */
1454 static int _lv_resume(struct cmd_context *cmd, const char *lvid_s,
1455                       struct lv_activate_opts *laopts, int error_if_not_active)
1456 {
1457         struct logical_volume *lv;
1458         struct lvinfo info;
1459         int r = 0;
1460
1461         if (!activation())
1462                 return 1;
1463
1464         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1465                 goto_out;
1466
1467         if (!lv_is_origin(lv))
1468                 laopts->origin_only = 0;
1469
1470         if (test_mode()) {
1471                 _skip("Resuming %s%s%s.", lv->name, laopts->origin_only ? " without snapshots" : "",
1472                       laopts->revert ? " (reverting)" : "");
1473                 r = 1;
1474                 goto out;
1475         }
1476
1477         log_debug("Resuming LV %s/%s%s%s%s.", lv->vg->name, lv->name,
1478                   error_if_not_active ? "" : " if active",
1479                   laopts->origin_only ? " without snapshots" : "",
1480                   laopts->revert ? " (reverting)" : "");
1481
1482         if (!lv_info(cmd, lv, laopts->origin_only, &info, 0, 0))
1483                 goto_out;
1484
1485         if (!info.exists || !info.suspended) {
1486                 if (error_if_not_active)
1487                         goto_out;
1488                 r = 1;
1489                 if (!info.suspended)
1490                         critical_section_dec(cmd, "already resumed");
1491                 goto out;
1492         }
1493
1494         laopts->read_only = _passes_readonly_filter(cmd, lv);
1495
1496         if (!_lv_activate_lv(lv, laopts))
1497                 goto_out;
1498
1499         critical_section_dec(cmd, "resumed");
1500
1501         if (!monitor_dev_for_events(cmd, lv, laopts, 1))
1502                 stack;
1503
1504         r = 1;
1505 out:
1506         if (lv)
1507                 release_vg(lv->vg);
1508
1509         return r;
1510 }
1511
1512 /* Returns success if the device is not active */
1513 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s,
1514                         unsigned origin_only, unsigned exclusive, unsigned revert)
1515 {
1516         struct lv_activate_opts laopts = {
1517                 .origin_only = origin_only,
1518                 /*
1519                  * When targets are activated exclusively in a cluster, the
1520                  * non-clustered target should be used.  This only happens
1521                  * if exclusive is set.
1522                  */
1523                 .exclusive = exclusive,
1524                 .revert = revert
1525         };
1526
1527         return _lv_resume(cmd, lvid_s, &laopts, 0);
1528 }
1529
1530 int lv_resume(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1531 {
1532         struct lv_activate_opts laopts = { .origin_only = origin_only, };
1533
1534         return _lv_resume(cmd, lvid_s, &laopts, 1);
1535 }
1536
1537 static int _lv_has_open_snapshots(struct logical_volume *lv)
1538 {
1539         struct lv_segment *snap_seg;
1540         struct lvinfo info;
1541         int r = 0;
1542
1543         dm_list_iterate_items_gen(snap_seg, &lv->snapshot_segs, origin_list) {
1544                 if (!lv_info(lv->vg->cmd, snap_seg->cow, 0, &info, 1, 0)) {
1545                         r = 1;
1546                         continue;
1547                 }
1548
1549                 if (info.exists && info.open_count) {
1550                         log_error("LV %s/%s has open snapshot %s: "
1551                                   "not deactivating", lv->vg->name, lv->name,
1552                                   snap_seg->cow->name);
1553                         r = 1;
1554                 }
1555         }
1556
1557         return r;
1558 }
1559
1560 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
1561 {
1562         struct logical_volume *lv;
1563         struct lvinfo info;
1564         int r = 0;
1565
1566         if (!activation())
1567                 return 1;
1568
1569         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1570                 goto out;
1571
1572         if (test_mode()) {
1573                 _skip("Deactivating '%s'.", lv->name);
1574                 r = 1;
1575                 goto out;
1576         }
1577
1578         log_debug("Deactivating %s/%s.", lv->vg->name, lv->name);
1579
1580         if (!lv_info(cmd, lv, 0, &info, 1, 0))
1581                 goto_out;
1582
1583         if (!info.exists) {
1584                 r = 1;
1585                 goto out;
1586         }
1587
1588         if (lv_is_visible(lv)) {
1589                 if (!lv_check_not_in_use(cmd, lv, &info))
1590                         goto_out;
1591
1592                 if (lv_is_origin(lv) && _lv_has_open_snapshots(lv))
1593                         goto_out;
1594         }
1595
1596         if (!lv_read_replicator_vgs(lv))
1597                 goto_out;
1598
1599         lv_calculate_readahead(lv, NULL);
1600
1601         if (!monitor_dev_for_events(cmd, lv, NULL, 0))
1602                 stack;
1603
1604         critical_section_inc(cmd, "deactivating");
1605         r = _lv_deactivate(lv);
1606         critical_section_dec(cmd, "deactivated");
1607
1608         if (!lv_info(cmd, lv, 0, &info, 0, 0) || info.exists)
1609                 r = 0;
1610 out:
1611         if (lv) {
1612                 lv_release_replicator_vgs(lv);
1613                 release_vg(lv->vg);
1614         }
1615
1616         return r;
1617 }
1618
1619 /* Test if LV passes filter */
1620 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
1621                          int *activate_lv)
1622 {
1623         struct logical_volume *lv;
1624         int r = 0;
1625
1626         if (!activation()) {
1627                 *activate_lv = 1;
1628                 return 1;
1629         }
1630
1631         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1632                 goto out;
1633
1634         if (!_passes_activation_filter(cmd, lv)) {
1635                 log_verbose("Not activating %s/%s since it does not pass "
1636                             "activation filter.", lv->vg->name, lv->name);
1637                 *activate_lv = 0;
1638         } else
1639                 *activate_lv = 1;
1640         r = 1;
1641 out:
1642         if (lv)
1643                 release_vg(lv->vg);
1644
1645         return r;
1646 }
1647
1648 static int _lv_activate(struct cmd_context *cmd, const char *lvid_s,
1649                         struct lv_activate_opts *laopts, int filter)
1650 {
1651         struct logical_volume *lv;
1652         struct lvinfo info;
1653         int r = 0;
1654
1655         if (!activation())
1656                 return 1;
1657
1658         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1659                 goto out;
1660
1661         if (filter && !_passes_activation_filter(cmd, lv)) {
1662                 log_error("Not activating %s/%s since it does not pass "
1663                           "activation filter.", lv->vg->name, lv->name);
1664                 goto out;
1665         }
1666
1667         if ((!lv->vg->cmd->partial_activation) && (lv->status & PARTIAL_LV)) {
1668                 log_error("Refusing activation of partial LV %s. Use --partial to override.",
1669                           lv->name);
1670                 goto_out;
1671         }
1672
1673         if (lv_has_unknown_segments(lv)) {
1674                 log_error("Refusing activation of LV %s containing "
1675                           "an unrecognised segment.", lv->name);
1676                 goto_out;
1677         }
1678
1679         if (test_mode()) {
1680                 _skip("Activating '%s'.", lv->name);
1681                 r = 1;
1682                 goto out;
1683         }
1684
1685         if (filter)
1686                 laopts->read_only = _passes_readonly_filter(cmd, lv);
1687
1688         log_debug("Activating %s/%s%s%s.", lv->vg->name, lv->name,
1689                   laopts->exclusive ? " exclusively" : "",
1690                   laopts->read_only ? " read-only" : "");
1691
1692         if (!lv_info(cmd, lv, 0, &info, 0, 0))
1693                 goto_out;
1694
1695         /*
1696          * Nothing to do?
1697          */
1698         if (info.exists && !info.suspended && info.live_table &&
1699             (info.read_only == read_only_lv(lv, laopts))) {
1700                 r = 1;
1701                 goto out;
1702         }
1703
1704         if (!lv_read_replicator_vgs(lv))
1705                 goto_out;
1706
1707         lv_calculate_readahead(lv, NULL);
1708
1709         critical_section_inc(cmd, "activating");
1710         if (!(r = _lv_activate_lv(lv, laopts)))
1711                 stack;
1712         critical_section_dec(cmd, "activated");
1713
1714         if (r && !monitor_dev_for_events(cmd, lv, laopts, 1))
1715                 stack;
1716
1717 out:
1718         if (lv) {
1719                 lv_release_replicator_vgs(lv);
1720                 release_vg(lv->vg);
1721         }
1722
1723         return r;
1724 }
1725
1726 /* Activate LV */
1727 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1728 {
1729         struct lv_activate_opts laopts = { .exclusive = exclusive };
1730
1731         if (!_lv_activate(cmd, lvid_s, &laopts, 0))
1732                 return_0;
1733
1734         return 1;
1735 }
1736
1737 /* Activate LV only if it passes filter */
1738 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1739 {
1740         struct lv_activate_opts laopts = { .exclusive = exclusive };
1741
1742         if (!_lv_activate(cmd, lvid_s, &laopts, 1))
1743                 return_0;
1744
1745         return 1;
1746 }
1747
1748 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
1749 {
1750         int r = 1;
1751
1752         if (!lv) {
1753                 r = dm_mknodes(NULL);
1754                 fs_unlock();
1755                 return r;
1756         }
1757
1758         if (!activation())
1759                 return 1;
1760
1761         r = dev_manager_mknodes(lv);
1762
1763         fs_unlock();
1764
1765         return r;
1766 }
1767
1768 /*
1769  * Does PV use VG somewhere in its construction?
1770  * Returns 1 on failure.
1771  */
1772 int pv_uses_vg(struct physical_volume *pv,
1773                struct volume_group *vg)
1774 {
1775         if (!activation())
1776                 return 0;
1777
1778         if (!dm_is_dm_major(MAJOR(pv->dev->dev)))
1779                 return 0;
1780
1781         return dev_manager_device_uses_vg(pv->dev, vg);
1782 }
1783
1784 void activation_release(void)
1785 {
1786         dev_manager_release();
1787 }
1788
1789 void activation_exit(void)
1790 {
1791         dev_manager_exit();
1792 }
1793 #endif