lib/activate/activate.c

   1 /*
   2  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   3  * Copyright (C) 2004-2009 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
  32 #include <limits.h>
  33 #include <fcntl.h>
  34 #include <unistd.h>
  35
  36 #define _skip(fmt, args...) log_very_verbose("Skipping: " fmt , ## args)
  37
  38 int lvm1_present(struct cmd_context *cmd)
  39 {
  40         char path[PATH_MAX];
  41
  42         if (dm_snprintf(path, sizeof(path), "%s/lvm/global", cmd->proc_dir)
  43             < 0) {
  44                 log_error("LVM1 proc global snprintf failed");
  45                 return 0;
  46         }
  47
  48         if (path_exists(path))
  49                 return 1;
  50         else
  51                 return 0;
  52 }
  53
  54 int list_segment_modules(struct dm_pool *mem, const struct lv_segment *seg,
  55                          struct dm_list *modules)
  56 {
  57         unsigned int s;
  58         struct lv_segment *seg2, *snap_seg;
  59         struct dm_list *snh;
  60
  61         if (seg->segtype->ops->modules_needed &&
  62             !seg->segtype->ops->modules_needed(mem, seg, modules)) {
  63                 log_error("module string allocation failed");
  64                 return 0;
  65         }
  66
  67         if (lv_is_origin(seg->lv))
  68                 dm_list_iterate(snh, &seg->lv->snapshot_segs)
  69                         if (!list_lv_modules(mem,
  70                                              dm_list_struct_base(snh,
  71                                                               struct lv_segment,
  72                                                               origin_list)->cow,
  73                                              modules))
  74                                 return_0;
  75
  76         if (lv_is_cow(seg->lv)) {
  77                 snap_seg = find_cow(seg->lv);
  78                 if (snap_seg->segtype->ops->modules_needed &&
  79                     !snap_seg->segtype->ops->modules_needed(mem, snap_seg,
  80                                                             modules)) {
  81                         log_error("snap_seg module string allocation failed");
  82                         return 0;
  83                 }
  84         }
  85
  86         for (s = 0; s < seg->area_count; s++) {
  87                 switch (seg_type(seg, s)) {
  88                 case AREA_LV:
  89                         seg2 = find_seg_by_le(seg_lv(seg, s), seg_le(seg, s));
  90                         if (seg2 && !list_segment_modules(mem, seg2, modules))
  91                                 return_0;
  92                         break;
  93                 case AREA_PV:
  94                 case AREA_UNASSIGNED:
  95                         ;
  96                 }
  97         }
  98
  99         return 1;
 100 }
 101
 102 int list_lv_modules(struct dm_pool *mem, const struct logical_volume *lv,
 103                     struct dm_list *modules)
 104 {
 105         struct lv_segment *seg;
 106
 107         dm_list_iterate_items(seg, &lv->segments)
 108                 if (!list_segment_modules(mem, seg, modules))
 109                         return_0;
 110
 111         return 1;
 112 }
 113
 114 #ifndef DEVMAPPER_SUPPORT
 115 void set_activation(int act)
 116 {
 117         static int warned = 0;
 118
 119         if (warned || !act)
 120                 return;
 121
 122         log_error("Compiled without libdevmapper support. "
 123                   "Can't enable activation.");
 124
 125         warned = 1;
 126 }
 127 int activation(void)
 128 {
 129         return 0;
 130 }
 131 int library_version(char *version, size_t size)
 132 {
 133         return 0;
 134 }
 135 int driver_version(char *version, size_t size)
 136 {
 137         return 0;
 138 }
 139 int target_version(const char *target_name, uint32_t *maj,
 140                    uint32_t *min, uint32_t *patchlevel)
 141 {
 142         return 0;
 143 }
 144 int target_present(struct cmd_context *cmd, const char *target_name,
 145                    int use_modprobe)
 146 {
 147         return 0;
 148 }
 149 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, struct lvinfo *info,
 150             int with_open_count, int with_read_ahead)
 151 {
 152         return 0;
 153 }
 154 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 155                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 156 {
 157         return 0;
 158 }
 159 int lv_snapshot_percent(const struct logical_volume *lv, float *percent,
 160                         percent_range_t *percent_range)
 161 {
 162         return 0;
 163 }
 164 int lv_mirror_percent(struct cmd_context *cmd, struct logical_volume *lv,
 165                       int wait, float *percent, percent_range_t *percent_range,
 166                       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_activated_by_uuid_only(struct volume_group *vg)
 175 {
 176         return 0;
 177 }
 178 int lvs_in_vg_opened(struct volume_group *vg)
 179 {
 180         return 0;
 181 }
 182 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
 183 {
 184         return 1;
 185 }
 186 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s)
 187 {
 188         return 1;
 189 }
 190 int lv_resume(struct cmd_context *cmd, const char *lvid_s)
 191 {
 192         return 1;
 193 }
 194 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s)
 195 {
 196         return 1;
 197 }
 198 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
 199 {
 200         return 1;
 201 }
 202 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
 203                          int *activate_lv)
 204 {
 205         return 1;
 206 }
 207 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
 208 {
 209         return 1;
 210 }
 211 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
 212 {
 213         return 1;
 214 }
 215
 216 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
 217 {
 218         return 1;
 219 }
 220
 221 int pv_uses_vg(struct physical_volume *pv,
 222                struct volume_group *vg)
 223 {
 224         return 0;
 225 }
 226
 227 void activation_release(void)
 228 {
 229         return;
 230 }
 231
 232 void activation_exit(void)
 233 {
 234         return;
 235 }
 236
 237 #else                           /* DEVMAPPER_SUPPORT */
 238
 239 static int _activation = 1;
 240
 241 void set_activation(int act)
 242 {
 243         if (act == _activation)
 244                 return;
 245
 246         _activation = act;
 247         if (_activation)
 248                 log_verbose("Activation enabled. Device-mapper kernel "
 249                             "driver will be used.");
 250         else
 251                 log_warn("WARNING: Activation disabled. No device-mapper "
 252                           "interaction will be attempted.");
 253 }
 254
 255 int activation(void)
 256 {
 257         return _activation;
 258 }
 259
 260 static int _passes_activation_filter(struct cmd_context *cmd,
 261                                      struct logical_volume *lv)
 262 {
 263         const struct config_node *cn;
 264         struct config_value *cv;
 265         char *str;
 266         char path[PATH_MAX];
 267
 268         if (!(cn = find_config_tree_node(cmd, "activation/volume_list"))) {
 269                 /* If no host tags defined, activate */
 270                 if (dm_list_empty(&cmd->tags))
 271                         return 1;
 272
 273                 /* If any host tag matches any LV or VG tag, activate */
 274                 if (str_list_match_list(&cmd->tags, &lv->tags) ||
 275                     str_list_match_list(&cmd->tags, &lv->vg->tags))
 276                         return 1;
 277
 278                 /* Don't activate */
 279                 return 0;
 280         }
 281
 282         for (cv = cn->v; cv; cv = cv->next) {
 283                 if (cv->type != CFG_STRING) {
 284                         log_error("Ignoring invalid string in config file "
 285                                   "activation/volume_list");
 286                         continue;
 287                 }
 288                 str = cv->v.str;
 289                 if (!*str) {
 290                         log_error("Ignoring empty string in config file "
 291                                   "activation/volume_list");
 292                         continue;
 293                 }
 294
 295                 /* Tag? */
 296                 if (*str == '@') {
 297                         str++;
 298                         if (!*str) {
 299                                 log_error("Ignoring empty tag in config file "
 300                                           "activation/volume_list");
 301                                 continue;
 302                         }
 303                         /* If any host tag matches any LV or VG tag, activate */
 304                         if (!strcmp(str, "*")) {
 305                                 if (str_list_match_list(&cmd->tags, &lv->tags)
 306                                     || str_list_match_list(&cmd->tags,
 307                                                            &lv->vg->tags))
 308                                             return 1;
 309                                 else
 310                                         continue;
 311                         }
 312                         /* If supplied tag matches LV or VG tag, activate */
 313                         if (str_list_match_item(&lv->tags, str) ||
 314                             str_list_match_item(&lv->vg->tags, str))
 315                                 return 1;
 316                         else
 317                                 continue;
 318                 }
 319                 if (!strchr(str, '/')) {
 320                         /* vgname supplied */
 321                         if (!strcmp(str, lv->vg->name))
 322                                 return 1;
 323                         else
 324                                 continue;
 325                 }
 326                 /* vgname/lvname */
 327                 if (dm_snprintf(path, sizeof(path), "%s/%s", lv->vg->name,
 328                                  lv->name) < 0) {
 329                         log_error("dm_snprintf error from %s/%s", lv->vg->name,
 330                                   lv->name);
 331                         continue;
 332                 }
 333                 if (!strcmp(path, str))
 334                         return 1;
 335         }
 336
 337         return 0;
 338 }
 339
 340 int library_version(char *version, size_t size)
 341 {
 342         if (!activation())
 343                 return 0;
 344
 345         return dm_get_library_version(version, size);
 346 }
 347
 348 int driver_version(char *version, size_t size)
 349 {
 350         if (!activation())
 351                 return 0;
 352
 353         log_very_verbose("Getting driver version");
 354
 355         return dm_driver_version(version, size);
 356 }
 357
 358 int target_version(const char *target_name, uint32_t *maj,
 359                    uint32_t *min, uint32_t *patchlevel)
 360 {
 361         int r = 0;
 362         struct dm_task *dmt;
 363         struct dm_versions *target, *last_target;
 364
 365         log_very_verbose("Getting target version for %s", target_name);
 366         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 367                 return_0;
 368
 369         if (!dm_task_run(dmt)) {
 370                 log_debug("Failed to get %s target version", target_name);
 371                 /* Assume this was because LIST_VERSIONS isn't supported */
 372                 return 1;
 373         }
 374
 375         target = dm_task_get_versions(dmt);
 376
 377         do {
 378                 last_target = target;
 379
 380                 if (!strcmp(target_name, target->name)) {
 381                         r = 1;
 382                         *maj = target->version[0];
 383                         *min = target->version[1];
 384                         *patchlevel = target->version[2];
 385                         goto out;
 386                 }
 387
 388                 target = (void *) target + target->next;
 389         } while (last_target != target);
 390
 391       out:
 392         dm_task_destroy(dmt);
 393
 394         return r;
 395 }
 396
 397 int module_present(struct cmd_context *cmd, const char *target_name)
 398 {
 399         int ret = 0;
 400 #ifdef MODPROBE_CMD
 401         char module[128];
 402         const char *argv[3];
 403
 404         if (dm_snprintf(module, sizeof(module), "dm-%s", target_name) < 0) {
 405                 log_error("module_present module name too long: %s",
 406                           target_name);
 407                 return 0;
 408         }
 409
 410         argv[0] = MODPROBE_CMD;
 411         argv[1] = module;
 412         argv[2] = NULL;
 413
 414         ret = exec_cmd(cmd, argv);
 415 #endif
 416         return ret;
 417 }
 418
 419 int target_present(struct cmd_context *cmd, const char *target_name,
 420                    int use_modprobe)
 421 {
 422         uint32_t maj, min, patchlevel;
 423
 424         if (!activation())
 425                 return 0;
 426
 427 #ifdef MODPROBE_CMD
 428         if (use_modprobe) {
 429                 if (target_version(target_name, &maj, &min, &patchlevel))
 430                         return 1;
 431
 432                 if (!module_present(cmd, target_name))
 433                         return_0;
 434         }
 435 #endif
 436
 437         return target_version(target_name, &maj, &min, &patchlevel);
 438 }
 439
 440 /*
 441  * Returns 1 if info structure populated, else 0 on failure.
 442  */
 443 static int _lv_info(struct cmd_context *cmd, const struct logical_volume *lv, int with_mknodes,
 444                     struct lvinfo *info, int with_open_count, int with_read_ahead, unsigned by_uuid_only)
 445 {
 446         struct dm_info dminfo;
 447         char *name = NULL;
 448
 449         if (!activation())
 450                 return 0;
 451
 452         if (!by_uuid_only &&
 453             !(name = build_dm_name(cmd->mem, lv->vg->name, lv->name, NULL)))
 454                 return_0;
 455
 456         log_debug("Getting device info for %s", name);
 457         if (!dev_manager_info(lv->vg->cmd->mem, name, lv, with_mknodes,
 458                               with_open_count, with_read_ahead, &dminfo,
 459                               &info->read_ahead)) {
 460                 if (name)
 461                         dm_pool_free(cmd->mem, name);
 462                 return_0;
 463         }
 464
 465         info->exists = dminfo.exists;
 466         info->suspended = dminfo.suspended;
 467         info->open_count = dminfo.open_count;
 468         info->major = dminfo.major;
 469         info->minor = dminfo.minor;
 470         info->read_only = dminfo.read_only;
 471         info->live_table = dminfo.live_table;
 472         info->inactive_table = dminfo.inactive_table;
 473
 474         if (name)
 475                 dm_pool_free(cmd->mem, name);
 476
 477         return 1;
 478 }
 479
 480 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, struct lvinfo *info,
 481             int with_open_count, int with_read_ahead)
 482 {
 483         return _lv_info(cmd, lv, 0, info, with_open_count, with_read_ahead, 0);
 484 }
 485
 486 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 487                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 488 {
 489         struct logical_volume *lv;
 490
 491         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 492                 return 0;
 493
 494         return _lv_info(cmd, lv, 0, info, with_open_count, with_read_ahead, 0);
 495 }
 496
 497 /*
 498  * Returns 1 if percent set, else 0 on failure.
 499  */
 500 int lv_snapshot_percent(const struct logical_volume *lv, float *percent,
 501                         percent_range_t *percent_range)
 502 {
 503         int r;
 504         struct dev_manager *dm;
 505
 506         if (!activation())
 507                 return 0;
 508
 509         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 510                 return_0;
 511
 512         if (!(r = dev_manager_snapshot_percent(dm, lv, percent, percent_range)))
 513                 stack;
 514
 515         dev_manager_destroy(dm);
 516
 517         return r;
 518 }
 519
 520 /* FIXME Merge with snapshot_percent */
 521 int lv_mirror_percent(struct cmd_context *cmd, struct logical_volume *lv,
 522                       int wait, float *percent, percent_range_t *percent_range,
 523                       uint32_t *event_nr)
 524 {
 525         int r;
 526         struct dev_manager *dm;
 527         struct lvinfo info;
 528
 529         /* If mirrored LV is temporarily shrinked to 1 area (= linear),
 530          * it should be considered in-sync. */
 531         if (dm_list_size(&lv->segments) == 1 && first_seg(lv)->area_count == 1) {
 532                 *percent = 100.0;
 533                 return 1;
 534         }
 535
 536         if (!activation())
 537                 return 0;
 538
 539         if (!lv_info(cmd, lv, &info, 0, 0))
 540                 return_0;
 541
 542         if (!info.exists)
 543                 return 0;
 544
 545         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 546                 return_0;
 547
 548         if (!(r = dev_manager_mirror_percent(dm, lv, wait, percent,
 549                                              percent_range, event_nr)))
 550                 stack;
 551
 552         dev_manager_destroy(dm);
 553
 554         return r;
 555 }
 556
 557 static int _lv_active(struct cmd_context *cmd, struct logical_volume *lv,
 558                       unsigned by_uuid_only)
 559 {
 560         struct lvinfo info;
 561
 562         if (!_lv_info(cmd, lv, 0, &info, 0, 0, by_uuid_only)) {
 563                 stack;
 564                 return -1;
 565         }
 566
 567         return info.exists;
 568 }
 569
 570 static int _lv_open_count(struct cmd_context *cmd, struct logical_volume *lv)
 571 {
 572         struct lvinfo info;
 573
 574         if (!lv_info(cmd, lv, &info, 1, 0)) {
 575                 stack;
 576                 return -1;
 577         }
 578
 579         return info.open_count;
 580 }
 581
 582 static int _lv_activate_lv(struct logical_volume *lv)
 583 {
 584         int r;
 585         struct dev_manager *dm;
 586
 587         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 588                 return_0;
 589
 590         if (!(r = dev_manager_activate(dm, lv)))
 591                 stack;
 592
 593         dev_manager_destroy(dm);
 594         return r;
 595 }
 596
 597 static int _lv_preload(struct logical_volume *lv, int *flush_required)
 598 {
 599         int r;
 600         struct dev_manager *dm;
 601
 602         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 603                 return_0;
 604
 605         if (!(r = dev_manager_preload(dm, lv, flush_required)))
 606                 stack;
 607
 608         dev_manager_destroy(dm);
 609         return r;
 610 }
 611
 612 static int _lv_deactivate(struct logical_volume *lv)
 613 {
 614         int r;
 615         struct dev_manager *dm;
 616
 617         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 618                 return_0;
 619
 620         if (!(r = dev_manager_deactivate(dm, lv)))
 621                 stack;
 622
 623         dev_manager_destroy(dm);
 624         return r;
 625 }
 626
 627 static int _lv_suspend_lv(struct logical_volume *lv, int lockfs, int flush_required)
 628 {
 629         int r;
 630         struct dev_manager *dm;
 631
 632         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 633                 return_0;
 634
 635         if (!(r = dev_manager_suspend(dm, lv, lockfs, flush_required)))
 636                 stack;
 637
 638         dev_manager_destroy(dm);
 639         return r;
 640 }
 641
 642 /*
 643  * These two functions return the number of visible LVs in the state,
 644  * or -1 on error.
 645  */
 646 static int _lvs_in_vg_activated(struct volume_group *vg, unsigned by_uuid_only)
 647 {
 648         struct lv_list *lvl;
 649         int count = 0;
 650
 651         if (!activation())
 652                 return 0;
 653
 654         dm_list_iterate_items(lvl, &vg->lvs) {
 655                 if (lv_is_visible(lvl->lv))
 656                         count += (_lv_active(vg->cmd, lvl->lv, by_uuid_only) == 1);
 657         }
 658
 659         return count;
 660 }
 661
 662 int lvs_in_vg_activated_by_uuid_only(struct volume_group *vg)
 663 {
 664         return _lvs_in_vg_activated(vg, 1);
 665 }
 666
 667 int lvs_in_vg_activated(struct volume_group *vg)
 668 {
 669         return _lvs_in_vg_activated(vg, 0);
 670 }
 671
 672 int lvs_in_vg_opened(const struct volume_group *vg)
 673 {
 674         const struct lv_list *lvl;
 675         int count = 0;
 676
 677         if (!activation())
 678                 return 0;
 679
 680         dm_list_iterate_items(lvl, &vg->lvs) {
 681                 if (lv_is_visible(lvl->lv))
 682                         count += (_lv_open_count(vg->cmd, lvl->lv) > 0);
 683         }
 684
 685         return count;
 686 }
 687
 688 /*
 689  * Determine whether an LV is active locally or in a cluster.
 690  * Assumes vg lock held.
 691  * Returns:
 692  * 0 - not active locally or on any node in cluster
 693  * 1 - active either locally or some node in the cluster
 694  */
 695 int lv_is_active(struct logical_volume *lv)
 696 {
 697         int ret;
 698
 699         if (_lv_active(lv->vg->cmd, lv, 0))
 700                 return 1;
 701
 702         if (!vg_is_clustered(lv->vg))
 703                 return 0;
 704
 705         if ((ret = remote_lock_held(lv->lvid.s)) >= 0)
 706                 return ret;
 707
 708         /*
 709          * Old compatibility code if locking doesn't support lock query
 710          * FIXME: check status to not deactivate already activate device
 711          */
 712         if (activate_lv_excl(lv->vg->cmd, lv)) {
 713                 deactivate_lv(lv->vg->cmd, lv);
 714                 return 0;
 715         }
 716
 717         /*
 718          * Exclusive local activation failed so assume it is active elsewhere.
 719          */
 720         return 1;
 721 }
 722
 723 /*
 724  * Returns 0 if an attempt to (un)monitor the device failed.
 725  * Returns 1 otherwise.
 726  */
 727 int monitor_dev_for_events(struct cmd_context *cmd,
 728                             struct logical_volume *lv, int monitor)
 729 {
 730 #ifdef DMEVENTD
 731         int i, pending = 0, monitored;
 732         int r = 1;
 733         struct dm_list *tmp, *snh, *snht;
 734         struct lv_segment *seg;
 735         int (*monitor_fn) (struct lv_segment *s, int e);
 736         uint32_t s;
 737
 738         /* skip dmeventd code altogether */
 739         if (dmeventd_monitor_mode() == DMEVENTD_MONITOR_IGNORE)
 740                 return 1;
 741
 742         /*
 743          * Nothing to do if dmeventd configured not to be used.
 744          */
 745         if (monitor && !dmeventd_monitor_mode())
 746                 return 1;
 747
 748         /*
 749          * In case of a snapshot device, we monitor lv->snapshot->lv,
 750          * not the actual LV itself.
 751          */
 752         if (lv_is_cow(lv))
 753                 return monitor_dev_for_events(cmd, lv->snapshot->lv, monitor);
 754
 755         /*
 756          * In case this LV is a snapshot origin, we instead monitor
 757          * each of its respective snapshots (the origin itself does
 758          * not need to be monitored).
 759          *
 760          * TODO: This may change when snapshots of mirrors are allowed.
 761          */
 762         if (lv_is_origin(lv)) {
 763                 dm_list_iterate_safe(snh, snht, &lv->snapshot_segs)
 764                         if (!monitor_dev_for_events(cmd, dm_list_struct_base(snh,
 765                                     struct lv_segment, origin_list)->cow, monitor))
 766                                 r = 0;
 767                 return r;
 768         }
 769
 770         dm_list_iterate(tmp, &lv->segments) {
 771                 seg = dm_list_item(tmp, struct lv_segment);
 772
 773                 /* Recurse for AREA_LV */
 774                 for (s = 0; s < seg->area_count; s++) {
 775                         if (seg_type(seg, s) != AREA_LV)
 776                                 continue;
 777                         if (!monitor_dev_for_events(cmd, seg_lv(seg, s),
 778                                                     monitor)) {
 779                                 log_error("Failed to %smonitor %s",
 780                                           monitor ? "" : "un",
 781                                           seg_lv(seg, s)->name);
 782                                 r = 0;
 783                         }
 784                 }
 785
 786                 if (!seg_monitored(seg) || (seg->status & PVMOVE))
 787                         continue;
 788
 789                 monitor_fn = NULL;
 790
 791                 /* Check monitoring status */
 792                 if (seg->segtype->ops->target_monitored)
 793                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
 794                 else
 795                         continue;  /* segtype doesn't support registration */
 796
 797                 /*
 798                  * FIXME: We should really try again if pending
 799                  */
 800                 monitored = (pending) ? 0 : monitored;
 801
 802                 if (monitor) {
 803                         if (monitored)
 804                                 log_verbose("%s/%s already monitored.", lv->vg->name, lv->name);
 805                         else if (seg->segtype->ops->target_monitor_events)
 806                                 monitor_fn = seg->segtype->ops->target_monitor_events;
 807                 } else {
 808                         if (!monitored)
 809                                 log_verbose("%s/%s already not monitored.", lv->vg->name, lv->name);
 810                         else if (seg->segtype->ops->target_unmonitor_events)
 811                                 monitor_fn = seg->segtype->ops->target_unmonitor_events;
 812                 }
 813
 814                 /* Do [un]monitor */
 815                 if (!monitor_fn)
 816                         continue;
 817
 818                 log_verbose("%sonitoring %s/%s", monitor ? "M" : "Not m", lv->vg->name, lv->name);
 819
 820                 /* FIXME specify events */
 821                 if (!monitor_fn(seg, 0)) {
 822                         log_error("%s/%s: %s segment monitoring function failed.",
 823                                   lv->vg->name, lv->name, seg->segtype->name);
 824                         return 0;
 825                 }
 826
 827                 /* Check [un]monitor results */
 828                 /* Try a couple times if pending, but not forever... */
 829                 for (i = 0; i < 10; i++) {
 830                         pending = 0;
 831                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
 832                         if (pending ||
 833                             (!monitored && monitor) ||
 834                             (monitored && !monitor))
 835                                 log_very_verbose("%s/%s %smonitoring still pending: waiting...",
 836                                                  lv->vg->name, lv->name, monitor ? "" : "un");
 837                         else
 838                                 break;
 839                         sleep(1);
 840                 }
 841
 842                 r = (monitored && monitor) || (!monitored && !monitor);
 843         }
 844
 845         return r;
 846 #else
 847         return 1;
 848 #endif
 849 }
 850
 851 static int _lv_suspend(struct cmd_context *cmd, const char *lvid_s,
 852                        int error_if_not_suspended)
 853 {
 854         struct logical_volume *lv = NULL, *lv_pre = NULL;
 855         struct lvinfo info;
 856         int r = 0, lockfs = 0, flush_required = 0;
 857
 858         if (!activation())
 859                 return 1;
 860
 861         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 862                 goto_out;
 863
 864         /* Use precommitted metadata if present */
 865         if (!(lv_pre = lv_from_lvid(cmd, lvid_s, 1)))
 866                 goto_out;
 867
 868         if (test_mode()) {
 869                 _skip("Suspending '%s'.", lv->name);
 870                 r = 1;
 871                 goto out;
 872         }
 873
 874         if (!lv_info(cmd, lv, &info, 0, 0))
 875                 goto_out;
 876
 877         if (!info.exists || info.suspended) {
 878                 r = error_if_not_suspended ? 0 : 1;
 879                 goto out;
 880         }
 881
 882         lv_calculate_readahead(lv, NULL);
 883
 884         /* If VG was precommitted, preload devices for the LV */
 885         if ((lv_pre->vg->status & PRECOMMITTED)) {
 886                 if (!_lv_preload(lv_pre, &flush_required)) {
 887                         /* FIXME Revert preloading */
 888                         goto_out;
 889                 }
 890         }
 891
 892         if (!monitor_dev_for_events(cmd, lv, 0))
 893                 /* FIXME Consider aborting here */
 894                 stack;
 895
 896         memlock_inc();
 897
 898         if (lv_is_origin(lv_pre) || lv_is_cow(lv_pre))
 899                 lockfs = 1;
 900
 901         if (!_lv_suspend_lv(lv, lockfs, flush_required)) {
 902                 memlock_dec();
 903                 fs_unlock();
 904                 goto out;
 905         }
 906
 907         r = 1;
 908 out:
 909         if (lv_pre)
 910                 vg_release(lv_pre->vg);
 911         if (lv)
 912                 vg_release(lv->vg);
 913
 914         return r;
 915 }
 916
 917 /* Returns success if the device is not active */
 918 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s)
 919 {
 920         return _lv_suspend(cmd, lvid_s, 0);
 921 }
 922
 923 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
 924 {
 925         return _lv_suspend(cmd, lvid_s, 1);
 926 }
 927
 928 static int _lv_resume(struct cmd_context *cmd, const char *lvid_s,
 929                       int error_if_not_active)
 930 {
 931         struct logical_volume *lv;
 932         struct lvinfo info;
 933         int r = 0;
 934
 935         if (!activation())
 936                 return 1;
 937
 938         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 939                 goto out;
 940
 941         if (test_mode()) {
 942                 _skip("Resuming '%s'.", lv->name);
 943                 r = 1;
 944                 goto out;
 945         }
 946
 947         if (!lv_info(cmd, lv, &info, 0, 0))
 948                 goto_out;
 949
 950         if (!info.exists || !info.suspended) {
 951                 r = error_if_not_active ? 0 : 1;
 952                 goto out;
 953         }
 954
 955         if (!_lv_activate_lv(lv))
 956                 goto out;
 957
 958         memlock_dec();
 959         fs_unlock();
 960
 961         if (!monitor_dev_for_events(cmd, lv, 1))
 962                 stack;
 963
 964         r = 1;
 965 out:
 966         if (lv)
 967                 vg_release(lv->vg);
 968
 969         return r;
 970 }
 971
 972 /* Returns success if the device is not active */
 973 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s)
 974 {
 975         return _lv_resume(cmd, lvid_s, 0);
 976 }
 977
 978 int lv_resume(struct cmd_context *cmd, const char *lvid_s)
 979 {
 980         return _lv_resume(cmd, lvid_s, 1);
 981 }
 982
 983 static int _lv_has_open_snapshots(struct logical_volume *lv)
 984 {
 985         struct lv_segment *snap_seg;
 986         struct lvinfo info;
 987         int r = 0;
 988
 989         dm_list_iterate_items_gen(snap_seg, &lv->snapshot_segs, origin_list) {
 990                 if (!lv_info(lv->vg->cmd, snap_seg->cow, &info, 1, 0)) {
 991                         r = 1;
 992                         continue;
 993                 }
 994
 995                 if (info.exists && info.open_count) {
 996                         log_error("LV %s/%s has open snapshot %s: "
 997                                   "not deactivating", lv->vg->name, lv->name,
 998                                   snap_seg->cow->name);
 999                         r = 1;
1000                 }
1001         }
1002
1003         return r;
1004 }
1005
1006 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
1007 {
1008         struct logical_volume *lv;
1009         struct lvinfo info;
1010         int r = 0;
1011
1012         if (!activation())
1013                 return 1;
1014
1015         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1016                 goto out;
1017
1018         if (test_mode()) {
1019                 _skip("Deactivating '%s'.", lv->name);
1020                 r = 1;
1021                 goto out;
1022         }
1023
1024         if (!lv_info(cmd, lv, &info, 1, 0))
1025                 goto_out;
1026
1027         if (!info.exists) {
1028                 r = 1;
1029                 goto out;
1030         }
1031
1032         if (lv_is_visible(lv)) {
1033                 if (info.open_count) {
1034                         log_error("LV %s/%s in use: not deactivating",
1035                                   lv->vg->name, lv->name);
1036                         goto out;
1037                 }
1038                 if (lv_is_origin(lv) && _lv_has_open_snapshots(lv))
1039                         goto_out;
1040         }
1041
1042         lv_calculate_readahead(lv, NULL);
1043
1044         if (!monitor_dev_for_events(cmd, lv, 0))
1045                 stack;
1046
1047         memlock_inc();
1048         r = _lv_deactivate(lv);
1049         memlock_dec();
1050         fs_unlock();
1051
1052         if (!lv_info(cmd, lv, &info, 1, 0) || info.exists)
1053                 r = 0;
1054 out:
1055         if (lv)
1056                 vg_release(lv->vg);
1057
1058         return r;
1059 }
1060
1061 /* Test if LV passes filter */
1062 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
1063                          int *activate_lv)
1064 {
1065         struct logical_volume *lv;
1066         int r = 0;
1067
1068         if (!activation()) {
1069                 *activate_lv = 1;
1070                 return 1;
1071         }
1072
1073         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1074                 goto out;
1075
1076         if (!_passes_activation_filter(cmd, lv)) {
1077                 log_verbose("Not activating %s/%s due to config file settings",
1078                             lv->vg->name, lv->name);
1079                 *activate_lv = 0;
1080         } else
1081                 *activate_lv = 1;
1082         r = 1;
1083 out:
1084         if (lv)
1085                 vg_release(lv->vg);
1086
1087         return r;
1088 }
1089
1090 static int _lv_activate(struct cmd_context *cmd, const char *lvid_s,
1091                         int exclusive, int filter)
1092 {
1093         struct logical_volume *lv;
1094         struct lvinfo info;
1095         int r = 0;
1096
1097         if (!activation())
1098                 return 1;
1099
1100         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1101                 goto out;
1102
1103         if (filter && !_passes_activation_filter(cmd, lv)) {
1104                 log_verbose("Not activating %s/%s due to config file settings",
1105                             lv->vg->name, lv->name);
1106                 goto out;
1107         }
1108
1109         if ((!lv->vg->cmd->partial_activation) && (lv->status & PARTIAL_LV)) {
1110                 log_error("Refusing activation of partial LV %s. Use --partial to override.",
1111                           lv->name);
1112                 goto_out;
1113         }
1114
1115         if (test_mode()) {
1116                 _skip("Activating '%s'.", lv->name);
1117                 r = 1;
1118                 goto out;
1119         }
1120
1121         if (!lv_info(cmd, lv, &info, 0, 0))
1122                 goto_out;
1123
1124         if (info.exists && !info.suspended && info.live_table) {
1125                 r = 1;
1126                 goto out;
1127         }
1128
1129         lv_calculate_readahead(lv, NULL);
1130
1131         if (exclusive)
1132                 lv->status |= ACTIVATE_EXCL;
1133
1134         memlock_inc();
1135         r = _lv_activate_lv(lv);
1136         memlock_dec();
1137         fs_unlock();
1138
1139         if (r && !monitor_dev_for_events(cmd, lv, 1))
1140                 stack;
1141
1142 out:
1143         if (lv)
1144                 vg_release(lv->vg);
1145
1146         return r;
1147 }
1148
1149 /* Activate LV */
1150 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1151 {
1152         return _lv_activate(cmd, lvid_s, exclusive, 0);
1153 }
1154
1155 /* Activate LV only if it passes filter */
1156 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1157 {
1158         return _lv_activate(cmd, lvid_s, exclusive, 1);
1159 }
1160
1161 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
1162 {
1163         struct lvinfo info;
1164         int r = 1;
1165
1166         if (!lv) {
1167                 r = dm_mknodes(NULL);
1168                 fs_unlock();
1169                 return r;
1170         }
1171
1172         if (!_lv_info(cmd, lv, 1, &info, 0, 0, 0))
1173                 return_0;
1174
1175         if (info.exists) {
1176                 if (lv_is_visible(lv))
1177                         r = dev_manager_lv_mknodes(lv);
1178         } else
1179                 r = dev_manager_lv_rmnodes(lv);
1180
1181         fs_unlock();
1182
1183         return r;
1184 }
1185
1186 /*
1187  * Does PV use VG somewhere in its construction?
1188  * Returns 1 on failure.
1189  */
1190 int pv_uses_vg(struct physical_volume *pv,
1191                struct volume_group *vg)
1192 {
1193         if (!activation())
1194                 return 0;
1195
1196         if (!dm_is_dm_major(MAJOR(pv->dev->dev)))
1197                 return 0;
1198
1199         return dev_manager_device_uses_vg(pv->dev, vg);
1200 }
1201
1202 void activation_release(void)
1203 {
1204         dev_manager_release();
1205 }
1206
1207 void activation_exit(void)
1208 {
1209         dev_manager_exit();
1210 }
1211 #endif