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 #include "sharedlib.h"
  32
  33 #include <limits.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36
  37 #define _skip(fmt, args...) log_very_verbose("Skipping: " fmt , ## args)
  38
  39 int lvm1_present(struct cmd_context *cmd)
  40 {
  41         char path[PATH_MAX];
  42
  43         if (dm_snprintf(path, sizeof(path), "%s/lvm/global", cmd->proc_dir)
  44             < 0) {
  45                 log_error("LVM1 proc global snprintf failed");
  46                 return 0;
  47         }
  48
  49         if (path_exists(path))
  50                 return 1;
  51         else
  52                 return 0;
  53 }
  54
  55 int list_segment_modules(struct dm_pool *mem, const struct lv_segment *seg,
  56                          struct dm_list *modules)
  57 {
  58         unsigned int s;
  59         struct lv_segment *seg2, *snap_seg;
  60         struct dm_list *snh;
  61
  62         if (seg->segtype->ops->modules_needed &&
  63             !seg->segtype->ops->modules_needed(mem, seg, modules)) {
  64                 log_error("module string allocation failed");
  65                 return 0;
  66         }
  67
  68         if (lv_is_origin(seg->lv))
  69                 dm_list_iterate(snh, &seg->lv->snapshot_segs)
  70                         if (!list_lv_modules(mem,
  71                                              dm_list_struct_base(snh,
  72                                                               struct lv_segment,
  73                                                               origin_list)->cow,
  74                                              modules))
  75                                 return_0;
  76
  77         if (lv_is_cow(seg->lv)) {
  78                 snap_seg = find_cow(seg->lv);
  79                 if (snap_seg->segtype->ops->modules_needed &&
  80                     !snap_seg->segtype->ops->modules_needed(mem, snap_seg,
  81                                                             modules)) {
  82                         log_error("snap_seg module string allocation failed");
  83                         return 0;
  84                 }
  85         }
  86
  87         for (s = 0; s < seg->area_count; s++) {
  88                 switch (seg_type(seg, s)) {
  89                 case AREA_LV:
  90                         seg2 = find_seg_by_le(seg_lv(seg, s), seg_le(seg, s));
  91                         if (seg2 && !list_segment_modules(mem, seg2, modules))
  92                                 return_0;
  93                         break;
  94                 case AREA_PV:
  95                 case AREA_UNASSIGNED:
  96                         ;
  97                 }
  98         }
  99
 100         return 1;
 101 }
 102
 103 int list_lv_modules(struct dm_pool *mem, const struct logical_volume *lv,
 104                     struct dm_list *modules)
 105 {
 106         struct lv_segment *seg;
 107
 108         dm_list_iterate_items(seg, &lv->segments)
 109                 if (!list_segment_modules(mem, seg, modules))
 110                         return_0;
 111
 112         return 1;
 113 }
 114
 115 #ifndef DEVMAPPER_SUPPORT
 116 void set_activation(int act)
 117 {
 118         static int warned = 0;
 119
 120         if (warned || !act)
 121                 return;
 122
 123         log_error("Compiled without libdevmapper support. "
 124                   "Can't enable activation.");
 125
 126         warned = 1;
 127 }
 128 int activation(void)
 129 {
 130         return 0;
 131 }
 132 int library_version(char *version, size_t size)
 133 {
 134         return 0;
 135 }
 136 int driver_version(char *version, size_t size)
 137 {
 138         return 0;
 139 }
 140 int target_version(const char *target_name, uint32_t *maj,
 141                    uint32_t *min, uint32_t *patchlevel)
 142 {
 143         return 0;
 144 }
 145 int target_present(struct cmd_context *cmd, const char *target_name,
 146                    int use_modprobe)
 147 {
 148         return 0;
 149 }
 150 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, unsigned origin_only,
 151             struct lvinfo *info, int with_open_count, int with_read_ahead)
 152 {
 153         return 0;
 154 }
 155 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 156                     unsigned origin_only,
 157                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 158 {
 159         return 0;
 160 }
 161 int lv_snapshot_percent(const struct logical_volume *lv, percent_t *percent)
 162 {
 163         return 0;
 164 }
 165 int lv_mirror_percent(struct cmd_context *cmd, struct logical_volume *lv,
 166                       int wait, percent_t *percent, uint32_t *event_nr)
 167 {
 168         return 0;
 169 }
 170 int lvs_in_vg_activated(struct volume_group *vg)
 171 {
 172         return 0;
 173 }
 174 int lvs_in_vg_opened(struct volume_group *vg)
 175 {
 176         return 0;
 177 }
 178 /******
 179 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
 180 {
 181         return 1;
 182 }
 183 *******/
 184 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s)
 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                 log_verbose("activation/volume_list configuration setting "
 268                             "not defined, checking only host tags for %s/%s",
 269                             lv->vg->name, lv->name);
 270
 271                 /* If no host tags defined, activate */
 272                 if (dm_list_empty(&cmd->tags))
 273                         return 1;
 274
 275                 /* If any host tag matches any LV or VG tag, activate */
 276                 if (str_list_match_list(&cmd->tags, &lv->tags, NULL) ||
 277                     str_list_match_list(&cmd->tags, &lv->vg->tags, NULL))
 278                         return 1;
 279
 280                 log_verbose("No host tag matches %s/%s",
 281                             lv->vg->name, lv->name);
 282
 283                 /* Don't activate */
 284                 return 0;
 285         }
 286         else
 287                 log_verbose("activation/volume_list configuration setting "
 288                             "defined, checking the list to match %s/%s",
 289                             lv->vg->name, lv->name);
 290
 291         for (cv = cn->v; cv; cv = cv->next) {
 292                 if (cv->type != CFG_STRING) {
 293                         log_error("Ignoring invalid string in config file "
 294                                   "activation/volume_list");
 295                         continue;
 296                 }
 297                 str = cv->v.str;
 298                 if (!*str) {
 299                         log_error("Ignoring empty string in config file "
 300                                   "activation/volume_list");
 301                         continue;
 302                 }
 303
 304
 305                 /* Tag? */
 306                 if (*str == '@') {
 307                         str++;
 308                         if (!*str) {
 309                                 log_error("Ignoring empty tag in config file "
 310                                           "activation/volume_list");
 311                                 continue;
 312                         }
 313                         /* If any host tag matches any LV or VG tag, activate */
 314                         if (!strcmp(str, "*")) {
 315                                 if (str_list_match_list(&cmd->tags, &lv->tags, NULL)
 316                                     || str_list_match_list(&cmd->tags,
 317                                                            &lv->vg->tags, NULL))
 318                                             return 1;
 319                                 else
 320                                         continue;
 321                         }
 322                         /* If supplied tag matches LV or VG tag, activate */
 323                         if (str_list_match_item(&lv->tags, str) ||
 324                             str_list_match_item(&lv->vg->tags, str))
 325                                 return 1;
 326                         else
 327                                 continue;
 328                 }
 329                 if (!strchr(str, '/')) {
 330                         /* vgname supplied */
 331                         if (!strcmp(str, lv->vg->name))
 332                                 return 1;
 333                         else
 334                                 continue;
 335                 }
 336                 /* vgname/lvname */
 337                 if (dm_snprintf(path, sizeof(path), "%s/%s", lv->vg->name,
 338                                  lv->name) < 0) {
 339                         log_error("dm_snprintf error from %s/%s", lv->vg->name,
 340                                   lv->name);
 341                         continue;
 342                 }
 343                 if (!strcmp(path, str))
 344                         return 1;
 345         }
 346
 347         log_verbose("No item supplied in activation/volume_list configuration "
 348                     "setting matches %s/%s", lv->vg->name, lv->name);
 349
 350         return 0;
 351 }
 352
 353 int library_version(char *version, size_t size)
 354 {
 355         if (!activation())
 356                 return 0;
 357
 358         return dm_get_library_version(version, size);
 359 }
 360
 361 int driver_version(char *version, size_t size)
 362 {
 363         if (!activation())
 364                 return 0;
 365
 366         log_very_verbose("Getting driver version");
 367
 368         return dm_driver_version(version, size);
 369 }
 370
 371 int target_version(const char *target_name, uint32_t *maj,
 372                    uint32_t *min, uint32_t *patchlevel)
 373 {
 374         int r = 0;
 375         struct dm_task *dmt;
 376         struct dm_versions *target, *last_target;
 377
 378         log_very_verbose("Getting target version for %s", target_name);
 379         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
 380                 return_0;
 381
 382         if (!dm_task_run(dmt)) {
 383                 log_debug("Failed to get %s target version", target_name);
 384                 /* Assume this was because LIST_VERSIONS isn't supported */
 385                 return 1;
 386         }
 387
 388         target = dm_task_get_versions(dmt);
 389
 390         do {
 391                 last_target = target;
 392
 393                 if (!strcmp(target_name, target->name)) {
 394                         r = 1;
 395                         *maj = target->version[0];
 396                         *min = target->version[1];
 397                         *patchlevel = target->version[2];
 398                         goto out;
 399                 }
 400
 401                 target = (void *) target + target->next;
 402         } while (last_target != target);
 403
 404       out:
 405         dm_task_destroy(dmt);
 406
 407         return r;
 408 }
 409
 410 int module_present(struct cmd_context *cmd, const char *target_name)
 411 {
 412         int ret = 0;
 413 #ifdef MODPROBE_CMD
 414         char module[128];
 415         const char *argv[3];
 416
 417         if (dm_snprintf(module, sizeof(module), "dm-%s", target_name) < 0) {
 418                 log_error("module_present module name too long: %s",
 419                           target_name);
 420                 return 0;
 421         }
 422
 423         argv[0] = MODPROBE_CMD;
 424         argv[1] = module;
 425         argv[2] = NULL;
 426
 427         ret = exec_cmd(cmd, argv, NULL);
 428 #endif
 429         return ret;
 430 }
 431
 432 int target_present(struct cmd_context *cmd, const char *target_name,
 433                    int use_modprobe)
 434 {
 435         uint32_t maj, min, patchlevel;
 436
 437         if (!activation())
 438                 return 0;
 439
 440 #ifdef MODPROBE_CMD
 441         if (use_modprobe) {
 442                 if (target_version(target_name, &maj, &min, &patchlevel))
 443                         return 1;
 444
 445                 if (!module_present(cmd, target_name))
 446                         return_0;
 447         }
 448 #endif
 449
 450         return target_version(target_name, &maj, &min, &patchlevel);
 451 }
 452
 453 /*
 454  * Returns 1 if info structure populated, else 0 on failure.
 455  */
 456 int lv_info(struct cmd_context *cmd, const struct logical_volume *lv, unsigned origin_only,
 457             struct lvinfo *info, int with_open_count, int with_read_ahead)
 458 {
 459         struct dm_info dminfo;
 460
 461         if (!activation())
 462                 return 0;
 463
 464         if (!dev_manager_info(lv->vg->cmd->mem, lv, origin_only ? "real" : NULL, with_open_count,
 465                               with_read_ahead, &dminfo, &info->read_ahead))
 466                 return_0;
 467
 468         info->exists = dminfo.exists;
 469         info->suspended = dminfo.suspended;
 470         info->open_count = dminfo.open_count;
 471         info->major = dminfo.major;
 472         info->minor = dminfo.minor;
 473         info->read_only = dminfo.read_only;
 474         info->live_table = dminfo.live_table;
 475         info->inactive_table = dminfo.inactive_table;
 476
 477         return 1;
 478 }
 479
 480 int lv_info_by_lvid(struct cmd_context *cmd, const char *lvid_s,
 481                     unsigned origin_only,
 482                     struct lvinfo *info, int with_open_count, int with_read_ahead)
 483 {
 484         int r;
 485         struct logical_volume *lv;
 486
 487         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 488                 return 0;
 489
 490         if (!lv_is_origin(lv))
 491                 origin_only = 0;
 492
 493         r = lv_info(cmd, lv, origin_only, info, with_open_count, with_read_ahead);
 494         free_vg(lv->vg);
 495
 496         return r;
 497 }
 498
 499 /*
 500  * Returns 1 if percent set, else 0 on failure.
 501  */
 502 int lv_check_transient(struct logical_volume *lv)
 503 {
 504         int r;
 505         struct dev_manager *dm;
 506
 507         if (!activation())
 508                 return 0;
 509
 510         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 511                 return_0;
 512
 513         if (!(r = dev_manager_transient(dm, lv)))
 514                 stack;
 515
 516         dev_manager_destroy(dm);
 517
 518         return r;
 519 }
 520
 521 /*
 522  * Returns 1 if percent set, else 0 on failure.
 523  */
 524 int lv_snapshot_percent(const struct logical_volume *lv, percent_t *percent)
 525 {
 526         int r;
 527         struct dev_manager *dm;
 528
 529         if (!activation())
 530                 return 0;
 531
 532         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 533                 return_0;
 534
 535         if (!(r = dev_manager_snapshot_percent(dm, lv, percent)))
 536                 stack;
 537
 538         dev_manager_destroy(dm);
 539
 540         return r;
 541 }
 542
 543 /* FIXME Merge with snapshot_percent */
 544 int lv_mirror_percent(struct cmd_context *cmd, struct logical_volume *lv,
 545                       int wait, percent_t *percent, uint32_t *event_nr)
 546 {
 547         int r;
 548         struct dev_manager *dm;
 549         struct lvinfo info;
 550
 551         /* If mirrored LV is temporarily shrinked to 1 area (= linear),
 552          * it should be considered in-sync. */
 553         if (dm_list_size(&lv->segments) == 1 && first_seg(lv)->area_count == 1) {
 554                 *percent = PERCENT_100;
 555                 return 1;
 556         }
 557
 558         if (!activation())
 559                 return 0;
 560
 561         if (!lv_info(cmd, lv, 0, &info, 0, 0))
 562                 return_0;
 563
 564         if (!info.exists)
 565                 return 0;
 566
 567         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 568                 return_0;
 569
 570         if (!(r = dev_manager_mirror_percent(dm, lv, wait, percent, event_nr)))
 571                 stack;
 572
 573         dev_manager_destroy(dm);
 574
 575         return r;
 576 }
 577
 578 static int _lv_active(struct cmd_context *cmd, struct logical_volume *lv)
 579 {
 580         struct lvinfo info;
 581
 582         if (!lv_info(cmd, lv, 0, &info, 0, 0)) {
 583                 stack;
 584                 return -1;
 585         }
 586
 587         return info.exists;
 588 }
 589
 590 static int _lv_open_count(struct cmd_context *cmd, struct logical_volume *lv)
 591 {
 592         struct lvinfo info;
 593
 594         if (!lv_info(cmd, lv, 0, &info, 1, 0)) {
 595                 stack;
 596                 return -1;
 597         }
 598
 599         return info.open_count;
 600 }
 601
 602 static int _lv_activate_lv(struct logical_volume *lv, unsigned origin_only)
 603 {
 604         int r;
 605         struct dev_manager *dm;
 606
 607         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 608                 return_0;
 609
 610         if (!(r = dev_manager_activate(dm, lv, origin_only)))
 611                 stack;
 612
 613         dev_manager_destroy(dm);
 614         return r;
 615 }
 616
 617 static int _lv_preload(struct logical_volume *lv, unsigned origin_only, int *flush_required)
 618 {
 619         int r;
 620         struct dev_manager *dm;
 621
 622         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 623                 return_0;
 624
 625         if (!(r = dev_manager_preload(dm, lv, origin_only, flush_required)))
 626                 stack;
 627
 628         dev_manager_destroy(dm);
 629         return r;
 630 }
 631
 632 static int _lv_deactivate(struct logical_volume *lv)
 633 {
 634         int r;
 635         struct dev_manager *dm;
 636
 637         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 638                 return_0;
 639
 640         if (!(r = dev_manager_deactivate(dm, lv)))
 641                 stack;
 642
 643         dev_manager_destroy(dm);
 644         return r;
 645 }
 646
 647 static int _lv_suspend_lv(struct logical_volume *lv, unsigned origin_only, int lockfs, int flush_required)
 648 {
 649         int r;
 650         struct dev_manager *dm;
 651
 652         if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name)))
 653                 return_0;
 654
 655         if (!(r = dev_manager_suspend(dm, lv, origin_only, lockfs, flush_required)))
 656                 stack;
 657
 658         dev_manager_destroy(dm);
 659         return r;
 660 }
 661
 662 /*
 663  * These two functions return the number of visible LVs in the state,
 664  * or -1 on error.
 665  */
 666 int lvs_in_vg_activated(struct volume_group *vg)
 667 {
 668         struct lv_list *lvl;
 669         int count = 0;
 670
 671         if (!activation())
 672                 return 0;
 673
 674         dm_list_iterate_items(lvl, &vg->lvs) {
 675                 if (lv_is_visible(lvl->lv))
 676                         count += (_lv_active(vg->cmd, lvl->lv) == 1);
 677         }
 678
 679         return count;
 680 }
 681
 682 int lvs_in_vg_opened(const struct volume_group *vg)
 683 {
 684         const struct lv_list *lvl;
 685         int count = 0;
 686
 687         if (!activation())
 688                 return 0;
 689
 690         dm_list_iterate_items(lvl, &vg->lvs) {
 691                 if (lv_is_visible(lvl->lv))
 692                         count += (_lv_open_count(vg->cmd, lvl->lv) > 0);
 693         }
 694
 695         return count;
 696 }
 697
 698 /*
 699  * Determine whether an LV is active locally or in a cluster.
 700  * Assumes vg lock held.
 701  * Returns:
 702  * 0 - not active locally or on any node in cluster
 703  * 1 - active either locally or some node in the cluster
 704  */
 705 int lv_is_active(struct logical_volume *lv)
 706 {
 707         int ret;
 708
 709         if (_lv_active(lv->vg->cmd, lv))
 710                 return 1;
 711
 712         if (!vg_is_clustered(lv->vg))
 713                 return 0;
 714
 715         if ((ret = remote_lock_held(lv->lvid.s)) >= 0)
 716                 return ret;
 717
 718         /*
 719          * Old compatibility code if locking doesn't support lock query
 720          * FIXME: check status to not deactivate already activate device
 721          */
 722         if (activate_lv_excl(lv->vg->cmd, lv)) {
 723                 if (!deactivate_lv(lv->vg->cmd, lv))
 724                         stack;
 725                 return 0;
 726         }
 727
 728         /*
 729          * Exclusive local activation failed so assume it is active elsewhere.
 730          */
 731         return 1;
 732 }
 733
 734 #ifdef DMEVENTD
 735 static struct dm_event_handler *_create_dm_event_handler(struct cmd_context *cmd, const char *dmuuid, const char *dso,
 736                                                          const int timeout, enum dm_event_mask mask)
 737 {
 738         struct dm_event_handler *dmevh;
 739
 740         if (!(dmevh = dm_event_handler_create()))
 741                 return_NULL;
 742
 743         if (dm_event_handler_set_dmeventd_path(dmevh, find_config_tree_str(cmd, "dmeventd/executable", NULL)))
 744                 goto_bad;
 745
 746         if (dm_event_handler_set_dso(dmevh, dso))
 747                 goto_bad;
 748
 749         if (dm_event_handler_set_uuid(dmevh, dmuuid))
 750                 goto_bad;
 751
 752         dm_event_handler_set_timeout(dmevh, timeout);
 753         dm_event_handler_set_event_mask(dmevh, mask);
 754
 755         return dmevh;
 756
 757 bad:
 758         dm_event_handler_destroy(dmevh);
 759         return NULL;
 760 }
 761
 762 char *get_monitor_dso_path(struct cmd_context *cmd, const char *libpath)
 763 {
 764         char *path;
 765
 766         if (!(path = dm_pool_alloc(cmd->mem, PATH_MAX))) {
 767                 log_error("Failed to allocate dmeventd library path.");
 768                 return NULL;
 769         }
 770
 771         get_shared_library_path(cmd, libpath, path, PATH_MAX);
 772
 773         return path;
 774 }
 775
 776 int target_registered_with_dmeventd(struct cmd_context *cmd, const char *dso,
 777                                     struct logical_volume *lv, int *pending)
 778 {
 779         char *uuid;
 780         enum dm_event_mask evmask = 0;
 781         struct dm_event_handler *dmevh;
 782
 783         *pending = 0;
 784
 785         if (!dso)
 786                 return_0;
 787
 788         /* We always monitor the "real" device, never the "snapshot-origin" itself. */
 789         if (!(uuid = build_dm_uuid(cmd->mem, lv->lvid.s, lv_is_origin(lv) ? "real" : NULL)))
 790                 return_0;
 791
 792         if (!(dmevh = _create_dm_event_handler(cmd, uuid, dso, 0, DM_EVENT_ALL_ERRORS)))
 793                 return_0;
 794
 795         if (dm_event_get_registered_device(dmevh, 0)) {
 796                 dm_event_handler_destroy(dmevh);
 797                 return 0;
 798         }
 799
 800         evmask = dm_event_handler_get_event_mask(dmevh);
 801         if (evmask & DM_EVENT_REGISTRATION_PENDING) {
 802                 *pending = 1;
 803                 evmask &= ~DM_EVENT_REGISTRATION_PENDING;
 804         }
 805
 806         dm_event_handler_destroy(dmevh);
 807
 808         return evmask;
 809 }
 810
 811 int target_register_events(struct cmd_context *cmd, const char *dso, struct logical_volume *lv,
 812                             int evmask __attribute__((unused)), int set, int timeout)
 813 {
 814         char *uuid;
 815         struct dm_event_handler *dmevh;
 816         int r;
 817
 818         if (!dso)
 819                 return_0;
 820
 821         /* We always monitor the "real" device, never the "snapshot-origin" itself. */
 822         if (!(uuid = build_dm_uuid(cmd->mem, lv->lvid.s, lv_is_origin(lv) ? "real" : NULL)))
 823                 return_0;
 824
 825         if (!(dmevh = _create_dm_event_handler(cmd, uuid, dso, timeout,
 826                                                DM_EVENT_ALL_ERRORS | (timeout ? DM_EVENT_TIMEOUT : 0))))
 827                 return_0;
 828
 829         r = set ? dm_event_register_handler(dmevh) : dm_event_unregister_handler(dmevh);
 830
 831         dm_event_handler_destroy(dmevh);
 832
 833         if (!r)
 834                 return_0;
 835
 836         log_info("%s %s for events", set ? "Monitored" : "Unmonitored", uuid);
 837
 838         return 1;
 839 }
 840
 841 #endif
 842
 843 /*
 844  * Returns 0 if an attempt to (un)monitor the device failed.
 845  * Returns 1 otherwise.
 846  */
 847 int monitor_dev_for_events(struct cmd_context *cmd, struct logical_volume *lv,
 848                            unsigned origin_only, int monitor)
 849 {
 850 #ifdef DMEVENTD
 851         int i, pending = 0, monitored;
 852         int r = 1;
 853         struct dm_list *tmp, *snh, *snht;
 854         struct lv_segment *seg;
 855         struct lv_segment *log_seg;
 856         int (*monitor_fn) (struct lv_segment *s, int e);
 857         uint32_t s;
 858
 859         /* skip dmeventd code altogether */
 860         if (dmeventd_monitor_mode() == DMEVENTD_MONITOR_IGNORE)
 861                 return 1;
 862
 863         /*
 864          * Nothing to do if dmeventd configured not to be used.
 865          */
 866         if (monitor && !dmeventd_monitor_mode())
 867                 return 1;
 868
 869         /*
 870          * In case of a snapshot device, we monitor lv->snapshot->lv,
 871          * not the actual LV itself.
 872          */
 873         if (lv_is_cow(lv) && !lv_is_merging_cow(lv))
 874                 return monitor_dev_for_events(cmd, lv->snapshot->lv, 0, monitor);
 875
 876         /*
 877          * In case this LV is a snapshot origin, we instead monitor
 878          * each of its respective snapshots.  The origin itself may
 879          * also need to be monitored if it is a mirror, for example.
 880          */
 881         if (!origin_only && lv_is_origin(lv))
 882                 dm_list_iterate_safe(snh, snht, &lv->snapshot_segs)
 883                         if (!monitor_dev_for_events(cmd, dm_list_struct_base(snh,
 884                                     struct lv_segment, origin_list)->cow, 0, monitor))
 885                                 r = 0;
 886
 887         /*
 888          * If the volume is mirrored and its log is also mirrored, monitor
 889          * the log volume as well.
 890          */
 891         if ((seg = first_seg(lv)) != NULL && seg->log_lv != NULL &&
 892             (log_seg = first_seg(seg->log_lv)) != NULL &&
 893             seg_is_mirrored(log_seg))
 894                 if (!monitor_dev_for_events(cmd, seg->log_lv, 0, monitor))
 895                         r = 0;
 896
 897         dm_list_iterate(tmp, &lv->segments) {
 898                 seg = dm_list_item(tmp, struct lv_segment);
 899
 900                 /* Recurse for AREA_LV */
 901                 for (s = 0; s < seg->area_count; s++) {
 902                         if (seg_type(seg, s) != AREA_LV)
 903                                 continue;
 904                         if (!monitor_dev_for_events(cmd, seg_lv(seg, s), 0,
 905                                                     monitor)) {
 906                                 log_error("Failed to %smonitor %s",
 907                                           monitor ? "" : "un",
 908                                           seg_lv(seg, s)->name);
 909                                 r = 0;
 910                         }
 911                 }
 912
 913                 if (!seg_monitored(seg) || (seg->status & PVMOVE))
 914                         continue;
 915
 916                 monitor_fn = NULL;
 917
 918                 /* Check monitoring status */
 919                 if (seg->segtype->ops->target_monitored)
 920                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
 921                 else
 922                         continue;  /* segtype doesn't support registration */
 923
 924                 /*
 925                  * FIXME: We should really try again if pending
 926                  */
 927                 monitored = (pending) ? 0 : monitored;
 928
 929                 if (monitor) {
 930                         if (monitored)
 931                                 log_verbose("%s/%s already monitored.", lv->vg->name, lv->name);
 932                         else if (seg->segtype->ops->target_monitor_events)
 933                                 monitor_fn = seg->segtype->ops->target_monitor_events;
 934                 } else {
 935                         if (!monitored)
 936                                 log_verbose("%s/%s already not monitored.", lv->vg->name, lv->name);
 937                         else if (seg->segtype->ops->target_unmonitor_events)
 938                                 monitor_fn = seg->segtype->ops->target_unmonitor_events;
 939                 }
 940
 941                 /* Do [un]monitor */
 942                 if (!monitor_fn)
 943                         continue;
 944
 945                 log_verbose("%sonitoring %s/%s%s", monitor ? "M" : "Not m", lv->vg->name, lv->name,
 946                             test_mode() ? " [Test mode: skipping this]" : "");
 947
 948                 /* FIXME Test mode should really continue a bit further. */
 949                 if (test_mode())
 950                         continue;
 951
 952                 /* FIXME specify events */
 953                 if (!monitor_fn(seg, 0)) {
 954                         log_error("%s/%s: %s segment monitoring function failed.",
 955                                   lv->vg->name, lv->name, seg->segtype->name);
 956                         return 0;
 957                 }
 958
 959                 /* Check [un]monitor results */
 960                 /* Try a couple times if pending, but not forever... */
 961                 for (i = 0; i < 10; i++) {
 962                         pending = 0;
 963                         monitored = seg->segtype->ops->target_monitored(seg, &pending);
 964                         if (pending ||
 965                             (!monitored && monitor) ||
 966                             (monitored && !monitor))
 967                                 log_very_verbose("%s/%s %smonitoring still pending: waiting...",
 968                                                  lv->vg->name, lv->name, monitor ? "" : "un");
 969                         else
 970                                 break;
 971                         sleep(1);
 972                 }
 973
 974                 if (r)
 975                         r = (monitored && monitor) || (!monitored && !monitor);
 976         }
 977
 978         return r;
 979 #else
 980         return 1;
 981 #endif
 982 }
 983
 984 static int _lv_suspend(struct cmd_context *cmd, const char *lvid_s,
 985                        unsigned origin_only, int error_if_not_suspended)
 986 {
 987         struct logical_volume *lv = NULL, *lv_pre = NULL;
 988         struct lvinfo info;
 989         int r = 0, lockfs = 0, flush_required = 0;
 990
 991         if (!activation())
 992                 return 1;
 993
 994         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
 995                 goto_out;
 996
 997         /* Use precommitted metadata if present */
 998         if (!(lv_pre = lv_from_lvid(cmd, lvid_s, 1)))
 999                 goto_out;
1000
1001         /* Ignore origin_only unless LV is origin in both old and new metadata */
1002         if (!lv_is_origin(lv) || !lv_is_origin(lv_pre))
1003                 origin_only = 0;
1004
1005         if (test_mode()) {
1006                 _skip("Suspending %s%s.", lv->name, origin_only ? " origin without snapshots" : "");
1007                 r = 1;
1008                 goto out;
1009         }
1010
1011         if (!lv_info(cmd, lv, origin_only, &info, 0, 0))
1012                 goto_out;
1013
1014         if (!info.exists || info.suspended) {
1015                 if (!error_if_not_suspended) {
1016                         r = 1;
1017                         if (info.suspended)
1018                                 memlock_inc(cmd);
1019                 }
1020                 goto out;
1021         }
1022
1023         if (!lv_read_replicator_vgs(lv))
1024                 goto_out;
1025
1026         lv_calculate_readahead(lv, NULL);
1027
1028         /* If VG was precommitted, preload devices for the LV */
1029         if ((lv_pre->vg->status & PRECOMMITTED)) {
1030                 if (!_lv_preload(lv_pre, origin_only, &flush_required)) {
1031                         /* FIXME Revert preloading */
1032                         goto_out;
1033                 }
1034         }
1035
1036         if (!monitor_dev_for_events(cmd, lv, origin_only, 0))
1037                 /* FIXME Consider aborting here */
1038                 stack;
1039
1040         memlock_inc(cmd);
1041
1042         if (!origin_only &&
1043             (lv_is_origin(lv_pre) || lv_is_cow(lv_pre)))
1044                 lockfs = 1;
1045
1046         if (!_lv_suspend_lv(lv, origin_only, lockfs, flush_required)) {
1047                 memlock_dec(cmd);
1048                 fs_unlock();
1049                 goto out;
1050         }
1051
1052         r = 1;
1053 out:
1054         if (lv_pre)
1055                 free_vg(lv_pre->vg);
1056         if (lv) {
1057                 lv_release_replicator_vgs(lv);
1058                 free_vg(lv->vg);
1059         }
1060
1061         return r;
1062 }
1063
1064 /* Returns success if the device is not active */
1065 int lv_suspend_if_active(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1066 {
1067         return _lv_suspend(cmd, lvid_s, origin_only, 0);
1068 }
1069
1070 /* No longer used */
1071 /***********
1072 int lv_suspend(struct cmd_context *cmd, const char *lvid_s)
1073 {
1074         return _lv_suspend(cmd, lvid_s, 1);
1075 }
1076 ***********/
1077
1078 static int _lv_resume(struct cmd_context *cmd, const char *lvid_s,
1079                       unsigned origin_only,
1080                       int error_if_not_active)
1081 {
1082         struct logical_volume *lv;
1083         struct lvinfo info;
1084         int r = 0;
1085
1086         if (!activation())
1087                 return 1;
1088
1089         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1090                 goto_out;
1091
1092         if (!lv_is_origin(lv))
1093                 origin_only = 0;
1094
1095         if (test_mode()) {
1096                 _skip("Resuming %s%s.", lv->name, origin_only ? " without snapshots" : "");
1097                 r = 1;
1098                 goto out;
1099         }
1100
1101         if (!lv_info(cmd, lv, origin_only, &info, 0, 0))
1102                 goto_out;
1103
1104         if (!info.exists || !info.suspended) {
1105                 if (error_if_not_active)
1106                         goto_out;
1107                 r = 1;
1108                 goto out;
1109         }
1110
1111         if (!_lv_activate_lv(lv, origin_only))
1112                 goto_out;
1113
1114         memlock_dec(cmd);
1115         fs_unlock();
1116
1117         if (!monitor_dev_for_events(cmd, lv, origin_only, 1))
1118                 stack;
1119
1120         r = 1;
1121 out:
1122         if (lv)
1123                 free_vg(lv->vg);
1124
1125         return r;
1126 }
1127
1128 /* Returns success if the device is not active */
1129 int lv_resume_if_active(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1130 {
1131         return _lv_resume(cmd, lvid_s, origin_only, 0);
1132 }
1133
1134 int lv_resume(struct cmd_context *cmd, const char *lvid_s, unsigned origin_only)
1135 {
1136         return _lv_resume(cmd, lvid_s, origin_only, 1);
1137 }
1138
1139 static int _lv_has_open_snapshots(struct logical_volume *lv)
1140 {
1141         struct lv_segment *snap_seg;
1142         struct lvinfo info;
1143         int r = 0;
1144
1145         dm_list_iterate_items_gen(snap_seg, &lv->snapshot_segs, origin_list) {
1146                 if (!lv_info(lv->vg->cmd, snap_seg->cow, 0, &info, 1, 0)) {
1147                         r = 1;
1148                         continue;
1149                 }
1150
1151                 if (info.exists && info.open_count) {
1152                         log_error("LV %s/%s has open snapshot %s: "
1153                                   "not deactivating", lv->vg->name, lv->name,
1154                                   snap_seg->cow->name);
1155                         r = 1;
1156                 }
1157         }
1158
1159         return r;
1160 }
1161
1162 int lv_deactivate(struct cmd_context *cmd, const char *lvid_s)
1163 {
1164         struct logical_volume *lv;
1165         struct lvinfo info;
1166         int r = 0;
1167
1168         if (!activation())
1169                 return 1;
1170
1171         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1172                 goto out;
1173
1174         if (test_mode()) {
1175                 _skip("Deactivating '%s'.", lv->name);
1176                 r = 1;
1177                 goto out;
1178         }
1179
1180         if (!lv_info(cmd, lv, 0, &info, 1, 0))
1181                 goto_out;
1182
1183         if (!info.exists) {
1184                 r = 1;
1185                 goto out;
1186         }
1187
1188         if (lv_is_visible(lv)) {
1189                 if (info.open_count) {
1190                         log_error("LV %s/%s in use: not deactivating",
1191                                   lv->vg->name, lv->name);
1192                         goto out;
1193                 }
1194                 if (lv_is_origin(lv) && _lv_has_open_snapshots(lv))
1195                         goto_out;
1196         }
1197
1198         if (!lv_read_replicator_vgs(lv))
1199                 goto_out;
1200
1201         lv_calculate_readahead(lv, NULL);
1202
1203         if (!monitor_dev_for_events(cmd, lv, 0, 0))
1204                 stack;
1205
1206         memlock_inc(cmd);
1207         r = _lv_deactivate(lv);
1208         memlock_dec(cmd);
1209         fs_unlock();
1210
1211         if (!lv_info(cmd, lv, 0, &info, 1, 0) || info.exists)
1212                 r = 0;
1213 out:
1214         if (lv) {
1215                 lv_release_replicator_vgs(lv);
1216                 free_vg(lv->vg);
1217         }
1218
1219         return r;
1220 }
1221
1222 /* Test if LV passes filter */
1223 int lv_activation_filter(struct cmd_context *cmd, const char *lvid_s,
1224                          int *activate_lv)
1225 {
1226         struct logical_volume *lv;
1227         int r = 0;
1228
1229         if (!activation()) {
1230                 *activate_lv = 1;
1231                 return 1;
1232         }
1233
1234         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1235                 goto out;
1236
1237         if (!_passes_activation_filter(cmd, lv)) {
1238                 log_verbose("Not activating %s/%s since it does not pass "
1239                             "activation filter.", lv->vg->name, lv->name);
1240                 *activate_lv = 0;
1241         } else
1242                 *activate_lv = 1;
1243         r = 1;
1244 out:
1245         if (lv)
1246                 free_vg(lv->vg);
1247
1248         return r;
1249 }
1250
1251 static int _lv_activate(struct cmd_context *cmd, const char *lvid_s,
1252                         int exclusive, int filter)
1253 {
1254         struct logical_volume *lv;
1255         struct lvinfo info;
1256         int r = 0;
1257
1258         if (!activation())
1259                 return 1;
1260
1261         if (!(lv = lv_from_lvid(cmd, lvid_s, 0)))
1262                 goto out;
1263
1264         if (filter && !_passes_activation_filter(cmd, lv)) {
1265                 log_error("Not activating %s/%s since it does not pass "
1266                           "activation filter.", lv->vg->name, lv->name);
1267                 goto out;
1268         }
1269
1270         if ((!lv->vg->cmd->partial_activation) && (lv->status & PARTIAL_LV)) {
1271                 log_error("Refusing activation of partial LV %s. Use --partial to override.",
1272                           lv->name);
1273                 goto_out;
1274         }
1275
1276         if (lv_has_unknown_segments(lv)) {
1277                 log_error("Refusing activation of LV %s containing "
1278                           "an unrecognised segment.", lv->name);
1279                 goto_out;
1280         }
1281
1282         if (test_mode()) {
1283                 _skip("Activating '%s'.", lv->name);
1284                 r = 1;
1285                 goto out;
1286         }
1287
1288         if (!lv_info(cmd, lv, 0, &info, 0, 0))
1289                 goto_out;
1290
1291         if (info.exists && !info.suspended && info.live_table) {
1292                 r = 1;
1293                 goto out;
1294         }
1295
1296         if (!lv_read_replicator_vgs(lv))
1297                 goto_out;
1298
1299         lv_calculate_readahead(lv, NULL);
1300
1301         if (exclusive)
1302                 lv->status |= ACTIVATE_EXCL;
1303
1304         memlock_inc(cmd);
1305         if (!(r = _lv_activate_lv(lv, 0)))
1306                 stack;
1307         memlock_dec(cmd);
1308         fs_unlock();
1309
1310         if (r && !monitor_dev_for_events(cmd, lv, 0, 1))
1311                 stack;
1312
1313 out:
1314         if (lv) {
1315                 lv_release_replicator_vgs(lv);
1316                 free_vg(lv->vg);
1317         }
1318
1319         return r;
1320 }
1321
1322 /* Activate LV */
1323 int lv_activate(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1324 {
1325         if (!_lv_activate(cmd, lvid_s, exclusive, 0))
1326                 return_0;
1327
1328         return 1;
1329 }
1330
1331 /* Activate LV only if it passes filter */
1332 int lv_activate_with_filter(struct cmd_context *cmd, const char *lvid_s, int exclusive)
1333 {
1334         if (!_lv_activate(cmd, lvid_s, exclusive, 1))
1335                 return_0;
1336
1337         return 1;
1338 }
1339
1340 int lv_mknodes(struct cmd_context *cmd, const struct logical_volume *lv)
1341 {
1342         int r = 1;
1343
1344         if (!lv) {
1345                 r = dm_mknodes(NULL);
1346                 fs_unlock();
1347                 return r;
1348         }
1349
1350         if (!activation())
1351                 return 1;
1352
1353         r = dev_manager_mknodes(lv);
1354
1355         fs_unlock();
1356
1357         return r;
1358 }
1359
1360 /*
1361  * Does PV use VG somewhere in its construction?
1362  * Returns 1 on failure.
1363  */
1364 int pv_uses_vg(struct physical_volume *pv,
1365                struct volume_group *vg)
1366 {
1367         if (!activation())
1368                 return 0;
1369
1370         if (!dm_is_dm_major(MAJOR(pv->dev->dev)))
1371                 return 0;
1372
1373         return dev_manager_device_uses_vg(pv->dev, vg);
1374 }
1375
1376 void activation_release(void)
1377 {
1378         dev_manager_release();
1379 }
1380
1381 void activation_exit(void)
1382 {
1383         dev_manager_exit();
1384 }
1385 #endif