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 {
 161         return 0;
 162 }
 163 int lv_mirror_percent(struct cmd_context *cmd, struct logical_volume *lv,
 164                       int wait, float *percent, uint32_t *event_nr)
 165 {
 166         return 0;
 167 }
 168 int lvs_in_vg_activated(struct volume_group *vg)
 169 {
 170         return 0;
 171 }
 172 int lvs_in_vg_activated_by_uuid_only(struct volume_group *vg)
 173 {
 174         return 0;
 175 }
 176 int lvs_in_vg_opened(struct volume_group *vg)
 177 {
 178         return 0;
 179 }
 180 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
 181 {
 182         return 1;
 183 }
 184 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s)
 185 {
 186         return 1;
 187 }
 188 int lv_resume(struct cmd_context *cmd, const char *lvid_s)
 189 {
 190         return 1;
 191 }
 192 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s)
 193 {
 194         return 1;
 195 }
 196 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
 197 {
 198         return 1;
 199 }
 200 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
 201                          int *activate_lv)
 202 {
 203         return 1;
 204 }
 205 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
 206 {
 207         return 1;
 208 }
 209 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
 210 {
 211         return 1;
 212 }
 213
 214 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
 215 {
 216         return 1;
 217 }
 218
 219 int pv_uses_vg(struct physical_volume *pv,
 220                struct volume_group *vg)
 221 {
 222         return 0;
 223 }
 224
 225 void activation_release(void)
 226 {
 227         return;
 228 }
 229
 230 void activation_exit(void)
 231 {
 232         return;
 233 }
 234
 235 #else                           /* DEVMAPPER_SUPPORT */
 236
 237 static int _activation = 1;
 238
 239 void set_activation(int act)
 240 {
 241         if (act == _activation)
 242                 return;
 243
 244         _activation = act;
 245         if (_activation)
 246                 log_verbose("Activation enabled. Device-mapper kernel "
 247                             "driver will be used.");
 248         else
 249                 log_warn("WARNING: Activation disabled. No device-mapper "
 250                           "interaction will be attempted.");
 251 }
 252
 253 int activation(void)
 254 {
 255         return _activation;
 256 }
 257
 258 static int _passes_activation_filter(struct cmd_context *cmd,
 259                                      struct logical_volume *lv)
 260 {
 261         const struct config_node *cn;
 262         struct config_value *cv;
 263         char *str;
 264         char path[PATH_MAX];
 265
 266         if (!(cn = find_config_tree_node(cmd, "activation/volume_list"))) {
 267                 /* If no host tags defined, activate */
 268                 if (dm_list_empty(&cmd->tags))
 269                         return 1;
 270
 271                 /* If any host tag matches any LV or VG tag, activate */
 272                 if (str_list_match_list(&cmd->tags, &lv->tags) ||
 273                     str_list_match_list(&cmd->tags, &lv->vg->tags))
 274                         return 1;
 275
 276                 /* Don't activate */
 277                 return 0;
 278         }
 279
 280         for (cv = cn->v; cv; cv = cv->next) {
 281                 if (cv->type != CFG_STRING) {
 282                         log_error("Ignoring invalid string in config file "
 283                                   "activation/volume_list");
 284                         continue;
 285                 }
 286                 str = cv->v.str;
 287                 if (!*str) {
 288                         log_error("Ignoring empty string in config file "
 289                                   "activation/volume_list");
 290                         continue;
 291                 }
 292
 293                 /* Tag? */
 294                 if (*str == '@') {
 295                         str++;
 296                         if (!*str) {
 297                                 log_error("Ignoring empty tag in config file "
 298                                           "activation/volume_list");
 299                                 continue;
 300                         }
 301                         /* If any host tag matches any LV or VG tag, activate */
 302                         if (!strcmp(str, "*")) {
 303                                 if (str_list_match_list(&cmd->tags, &lv->tags)
 304                                     || str_list_match_list(&cmd->tags,
 305                                                            &lv->vg->tags))
 306                                             return 1;
 307                                 else
 308                                         continue;
 309                         }
 310                         /* If supplied tag matches LV or VG tag, activate */
 311                         if (str_list_match_item(&lv->tags, str) ||
 312                             str_list_match_item(&lv->vg->tags, str))
 313                                 return 1;
 314                         else
 315                                 continue;
 316                 }
 317                 if (!strchr(str, '/')) {
 318                         /* vgname supplied */
 319                         if (!strcmp(str, lv->vg->name))
 320                                 return 1;
 321                         else
 322                                 continue;
 323                 }
 324                 /* vgname/lvname */
 325                 if (dm_snprintf(path, sizeof(path), "%s/%s", lv->vg->name,
 326                                  lv->name) < 0) {
 327                         log_error("dm_snprintf error from %s/%s", lv->vg->name,
 328                                   lv->name);
 329                         continue;
 330                 }
 331                 if (!strcmp(path, str))
 332                         return 1;
 333         }
 334
 335         return 0;
 336 }
 337
 338 int library_version(char *version, size_t size)
 339 {
 340         if (!activation())
 341                 return 0;
 342
 343         return dm_get_library_version(version, size);
 344 }
 345
 346 int driver_version(char *version, size_t size)
 347 {
 348         if (!activation())
 349                 return 0;
 350
 351         log_very_verbose("Getting driver version");
 352
 353         return dm_driver_version(version, size);
 354 }
 355
 356 int target_version(const char *target_name, uint32_t *maj,
 357                    uint32_t *min, uint32_t *patchlevel)
 358 {
 359         int r = 0;
 360         struct dm_task *dmt;
 361         struct dm_versions *target, *last_target;
 362
 363         log_very_verbose("Getting target version for %s", target_name);
 364         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 365                 return_0;
 366
 367         if (!dm_task_run(dmt)) {
 368                 log_debug("Failed to get %s target version", target_name);
 369                 /* Assume this was because LIST_VERSIONS isn't supported */
 370                 return 1;
 371         }
 372
 373         target = dm_task_get_versions(dmt);
 374
 375         do {
 376                 last_target = target;
 377
 378                 if (!strcmp(target_name, target->name)) {
 379                         r = 1;
 380                         *maj = target->version[0];
 381                         *min = target->version[1];
 382                         *patchlevel = target->version[2];
 383                         goto out;
 384                 }
 385
 386                 target = (void *) target + target->next;
 387         } while (last_target != target);
 388
 389       out:
 390         dm_task_destroy(dmt);
 391
 392         return r;
 393 }
 394
 395 int module_present(struct cmd_context *cmd, const char *target_name)
 396 {
 397         int ret = 0;
 398 #ifdef MODPROBE_CMD
 399         char module[128];
 400         const char *argv[3];
 401
 402         if (dm_snprintf(module, sizeof(module), "dm-%s", target_name) < 0) {
 403                 log_error("module_present module name too long: %s",
 404                           target_name);
 405                 return 0;
 406         }
 407
 408         argv[0] = MODPROBE_CMD;
 409         argv[1] = module;
 410         argv[2] = NULL;
 411
 412         ret = exec_cmd(cmd, argv);
 413 #endif
 414         return ret;
 415 }
 416
 417 int target_present(struct cmd_context *cmd, const char *target_name,
 418                    int use_modprobe)
 419 {
 420         uint32_t maj, min, patchlevel;
 421
 422         if (!activation())
 423                 return 0;
 424
 425 #ifdef MODPROBE_CMD
 426         if (use_modprobe) {
 427                 if (target_version(target_name, &maj, &min, &patchlevel))
 428                         return 1;
 429
 430                 if (!module_present(cmd, target_name))
 431                         return_0;
 432         }
 433 #endif
 434
 435         return target_version(target_name, &maj, &min, &patchlevel);
 436 }
 437
 438 /*
 439  * Returns 1 if info structure populated, else 0 on failure.
 440  */
 441 static int _lv_info(struct cmd_context *cmd, const struct logical_volume *lv, int with_mknodes,
 442                     struct lvinfo *info, int with_open_count, int with_read_ahead, unsigned by_uuid_only)
 443 {
 444         struct dm_info dminfo;
 445         char *name = NULL;
 446
 447         if (!activation())
 448                 return 0;
 449
 450         if (!by_uuid_only &&
 451             !(name = build_dm_name(cmd->mem, lv->vg->name, lv->name, NULL)))
 452                 return_0;
 453
 454         log_debug("Getting device info for %s", name);
 455         if (!dev_manager_info(lv->vg->cmd->mem, name, lv, with_mknodes,
 456                               with_open_count, with_read_ahead, &dminfo,
 457                               &info->read_ahead)) {
 458                 if (name)
 459                         dm_pool_free(cmd->mem, name);
 460                 return_0;
 461         }
 462
 463         info->exists = dminfo.exists;
 464         info->suspended = dminfo.suspended;
 465         info->open_count = dminfo.open_count;
 466         info->major = dminfo.major;
 467         info->minor = dminfo.minor;
 468         info->read_only = dminfo.read_only;
 469         info->live_table = dminfo.live_table;
 470         info->inactive_table = dminfo.inactive_table;
 471
 472         /*
 473          * Cache read ahead value for PV devices now (before possible suspend)
 474          */
 475         (void)lv_calculate_readhead(lv);
 476
 477         if (name)
 478                 dm_pool_free(cmd->mem, name);
 479
 480         return 1;
 481 }
 482
 483 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, struct lvinfo *info,
 484             int with_open_count, int with_read_ahead)
 485 {
 486         return _lv_info(cmd, lv, 0, info, with_open_count, with_read_ahead, 0);
 487 }
 488
 489 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 490                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 491 {
 492         struct logical_volume *lv;
 493
 494         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 495                 return 0;
 496
 497         return _lv_info(cmd, lv, 0, info, with_open_count, with_read_ahead, 0);
 498 }
 499
 500 /*
 501  * Returns 1 if percent set, else 0 on failure.
 502  */
 503 int lv_snapshot_percent(const struct logical_volume *lv, float *percent)
 504 {
 505         int r;
 506         struct dev_manager *dm;
 507
 508         if (!activation())
 509                 return 0;
 510
 511         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 512                 return_0;
 513
 514         if (!(r = dev_manager_snapshot_percent(dm, lv, percent)))
 515                 stack;
 516
 517         dev_manager_destroy(dm);
 518
 519         return r;
 520 }
 521
 522 /* FIXME Merge with snapshot_percent */
 523 int lv_mirror_percent(struct cmd_context *cmd, struct logical_volume *lv,
 524                       int wait, float *percent, uint32_t *event_nr)
 525 {
 526         int r;
 527         struct dev_manager *dm;
 528         struct lvinfo info;
 529
 530         /* If mirrored LV is temporarily shrinked to 1 area (= linear),
 531          * it should be considered in-sync. */
 532         if (dm_list_size(&lv->segments) == 1 && first_seg(lv)->area_count == 1) {
 533                 *percent = 100.0;
 534                 return 1;
 535         }
 536
 537         if (!activation())
 538                 return 0;
 539
 540         if (!lv_info(cmd, lv, &info, 0, 0))
 541                 return_0;
 542
 543         if (!info.exists)
 544                 return 0;
 545
 546         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 547                 return_0;
 548
 549         if (!(r = dev_manager_mirror_percent(dm, lv, wait, percent, 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         /* If VG was precommitted, preload devices for the LV */
 883         if ((lv_pre->vg->status & PRECOMMITTED)) {
 884                 if (!_lv_preload(lv_pre, &flush_required)) {
 885                         /* FIXME Revert preloading */
 886                         goto_out;
 887                 }
 888         }
 889
 890         if (!monitor_dev_for_events(cmd, lv, 0))
 891                 /* FIXME Consider aborting here */
 892                 stack;
 893
 894         memlock_inc();
 895
 896         if (lv_is_origin(lv_pre) || lv_is_cow(lv_pre))
 897                 lockfs = 1;
 898
 899         if (!_lv_suspend_lv(lv, lockfs, flush_required)) {
 900                 memlock_dec();
 901                 fs_unlock();
 902                 goto out;
 903         }
 904
 905         r = 1;
 906 out:
 907         if (lv_pre)
 908                 vg_release(lv_pre->vg);
 909         if (lv)
 910                 vg_release(lv->vg);
 911
 912         return r;
 913 }
 914
 915 /* Returns success if the device is not active */
 916 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s)
 917 {
 918         return _lv_suspend(cmd, lvid_s, 0);
 919 }
 920
 921 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
 922 {
 923         return _lv_suspend(cmd, lvid_s, 1);
 924 }
 925
 926 static int _lv_resume(struct cmd_context *cmd, const char *lvid_s,
 927                       int error_if_not_active)
 928 {
 929         struct logical_volume *lv;
 930         struct lvinfo info;
 931         int r = 0;
 932
 933         if (!activation())
 934                 return 1;
 935
 936         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 937                 goto out;
 938
 939         if (test_mode()) {
 940                 _skip("Resuming '%s'.", lv->name);
 941                 r = 1;
 942                 goto out;
 943         }
 944
 945         if (!lv_info(cmd, lv, &info, 0, 0))
 946                 goto_out;
 947
 948         if (!info.exists || !info.suspended) {
 949                 r = error_if_not_active ? 0 : 1;
 950                 goto out;
 951         }
 952
 953         if (!_lv_activate_lv(lv))
 954                 goto out;
 955
 956         memlock_dec();
 957         fs_unlock();
 958
 959         if (!monitor_dev_for_events(cmd, lv, 1))
 960                 stack;
 961
 962         r = 1;
 963 out:
 964         if (lv)
 965                 vg_release(lv->vg);
 966
 967         return r;
 968 }
 969
 970 /* Returns success if the device is not active */
 971 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s)
 972 {
 973         return _lv_resume(cmd, lvid_s, 0);
 974 }
 975
 976 int lv_resume(struct cmd_context *cmd, const char *lvid_s)
 977 {
 978         return _lv_resume(cmd, lvid_s, 1);
 979 }
 980
 981 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
 982 {
 983         struct logical_volume *lv;
 984         struct lvinfo info;
 985         int r = 0;
 986
 987         if (!activation())
 988                 return 1;
 989
 990         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 991                 goto out;
 992
 993         if (test_mode()) {
 994                 _skip("Deactivating '%s'.", lv->name);
 995                 r = 1;
 996                 goto out;
 997         }
 998
 999         if (!lv_info(cmd, lv, &info, 1, 0))
1000                 goto_out;
1001
1002         if (!info.exists) {
1003                 r = 1;
1004                 goto out;
1005         }
1006
1007         if (info.open_count && lv_is_visible(lv)) {
1008                 log_error("LV %s/%s in use: not deactivating", lv->vg->name,
1009                           lv->name);
1010                 goto out;
1011         }
1012
1013         if (!monitor_dev_for_events(cmd, lv, 0))
1014                 stack;
1015
1016         memlock_inc();
1017         r = _lv_deactivate(lv);
1018         memlock_dec();
1019         fs_unlock();
1020
1021 out:
1022         if (lv)
1023                 vg_release(lv->vg);
1024
1025         return r;
1026 }
1027
1028 /* Test if LV passes filter */
1029 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
1030                          int *activate_lv)
1031 {
1032         struct logical_volume *lv;
1033         int r = 0;
1034
1035         if (!activation()) {
1036                 *activate_lv = 1;
1037                 return 1;
1038         }
1039
1040         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1041                 goto out;
1042
1043         if (!_passes_activation_filter(cmd, lv)) {
1044                 log_verbose("Not activating %s/%s due to config file settings",
1045                             lv->vg->name, lv->name);
1046                 *activate_lv = 0;
1047         } else
1048                 *activate_lv = 1;
1049         r = 1;
1050 out:
1051         if (lv)
1052                 vg_release(lv->vg);
1053
1054         return r;
1055 }
1056
1057 static int _lv_activate(struct cmd_context *cmd, const char *lvid_s,
1058                         int exclusive, int filter)
1059 {
1060         struct logical_volume *lv;
1061         struct lvinfo info;
1062         int r = 0;
1063
1064         if (!activation())
1065                 return 1;
1066
1067         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1068                 goto out;
1069
1070         if (filter && !_passes_activation_filter(cmd, lv)) {
1071                 log_verbose("Not activating %s/%s due to config file settings",
1072                             lv->vg->name, lv->name);
1073                 goto out;
1074         }
1075
1076         if ((!lv->vg->cmd->partial_activation) && (lv->status & PARTIAL_LV)) {
1077                 log_error("Refusing activation of partial LV %s. Use --partial to override.",
1078                           lv->name);
1079                 goto_out;
1080         }
1081
1082         if (test_mode()) {
1083                 _skip("Activating '%s'.", lv->name);
1084                 r = 1;
1085                 goto out;
1086         }
1087
1088         if (!lv_info(cmd, lv, &info, 0, 0))
1089                 goto_out;
1090
1091         if (info.exists && !info.suspended && info.live_table) {
1092                 r = 1;
1093                 goto out;
1094         }
1095
1096         if (exclusive)
1097                 lv->status |= ACTIVATE_EXCL;
1098
1099         memlock_inc();
1100         r = _lv_activate_lv(lv);
1101         memlock_dec();
1102         fs_unlock();
1103
1104         if (r && !monitor_dev_for_events(cmd, lv, 1))
1105                 stack;
1106
1107 out:
1108         if (lv)
1109                 vg_release(lv->vg);
1110
1111         return r;
1112 }
1113
1114 /* Activate LV */
1115 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1116 {
1117         return _lv_activate(cmd, lvid_s, exclusive, 0);
1118 }
1119
1120 /* Activate LV only if it passes filter */
1121 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1122 {
1123         return _lv_activate(cmd, lvid_s, exclusive, 1);
1124 }
1125
1126 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
1127 {
1128         struct lvinfo info;
1129         int r = 1;
1130
1131         if (!lv) {
1132                 r = dm_mknodes(NULL);
1133                 fs_unlock();
1134                 return r;
1135         }
1136
1137         if (!_lv_info(cmd, lv, 1, &info, 0, 0, 0))
1138                 return_0;
1139
1140         if (info.exists) {
1141                 if (lv_is_visible(lv))
1142                         r = dev_manager_lv_mknodes(lv);
1143         } else
1144                 r = dev_manager_lv_rmnodes(lv);
1145
1146         fs_unlock();
1147
1148         return r;
1149 }
1150
1151 /*
1152  * Does PV use VG somewhere in its construction?
1153  * Returns 1 on failure.
1154  */
1155 int pv_uses_vg(struct physical_volume *pv,
1156                struct volume_group *vg)
1157 {
1158         if (!activation())
1159                 return 0;
1160
1161         if (!dm_is_dm_major(MAJOR(pv->dev->dev)))
1162                 return 0;
1163
1164         return dev_manager_device_uses_vg(pv->dev, vg);
1165 }
1166
1167 void activation_release(void)
1168 {
1169         dev_manager_release();
1170 }
1171
1172 void activation_exit(void)
1173 {
1174         dev_manager_exit();
1175 }
1176 #endif