contrib/lvm2/dist/lib/cache/lvmcache.c

   1 /*      $NetBSD: lvmcache.c,v 1.1.1.3 2009/12/02 00:26:21 haad Exp $    */
   2
   3 /*
   4  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is part of LVM2.
   8  *
   9  * This copyrighted material is made available to anyone wishing to use,
  10  * modify, copy, or redistribute it subject to the terms and conditions
  11  * of the GNU Lesser General Public License v.2.1.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #include "lib.h"
  19 #include "lvmcache.h"
  20 #include "toolcontext.h"
  21 #include "dev-cache.h"
  22 #include "locking.h"
  23 #include "metadata.h"
  24 #include "filter.h"
  25 #include "filter-persistent.h"
  26 #include "memlock.h"
  27 #include "str_list.h"
  28 #include "format-text.h"
  29 #include "format_pool.h"
  30 #include "format1.h"
  31
  32 static struct dm_hash_table *_pvid_hash = NULL;
  33 static struct dm_hash_table *_vgid_hash = NULL;
  34 static struct dm_hash_table *_vgname_hash = NULL;
  35 static struct dm_hash_table *_lock_hash = NULL;
  36 static struct dm_list _vginfos;
  37 static int _scanning_in_progress = 0;
  38 static int _has_scanned = 0;
  39 static int _vgs_locked = 0;
  40 static int _vg_global_lock_held = 0;    /* Global lock held when cache wiped? */
  41
  42 int lvmcache_init(void)
  43 {
  44         dm_list_init(&_vginfos);
  45
  46         if (!(_vgname_hash = dm_hash_create(128)))
  47                 return 0;
  48
  49         if (!(_vgid_hash = dm_hash_create(128)))
  50                 return 0;
  51
  52         if (!(_pvid_hash = dm_hash_create(128)))
  53                 return 0;
  54
  55         if (!(_lock_hash = dm_hash_create(128)))
  56                 return 0;
  57
  58         /*
  59          * Reinitialising the cache clears the internal record of
  60          * which locks are held.  The global lock can be held during
  61          * this operation so its state must be restored afterwards.
  62          */
  63         if (_vg_global_lock_held) {
  64                 lvmcache_lock_vgname(VG_GLOBAL, 0);
  65                 _vg_global_lock_held = 0;
  66         }
  67
  68         return 1;
  69 }
  70
  71 /* Volume Group metadata cache functions */
  72 static void _free_cached_vgmetadata(struct lvmcache_vginfo *vginfo)
  73 {
  74         if (!vginfo || !vginfo->vgmetadata)
  75                 return;
  76
  77         dm_free(vginfo->vgmetadata);
  78
  79         vginfo->vgmetadata = NULL;
  80
  81         log_debug("Metadata cache: VG %s wiped.", vginfo->vgname);
  82 }
  83
  84 /*
  85  * Cache VG metadata against the vginfo with matching vgid.
  86  */
  87 static void _store_metadata(struct volume_group *vg, unsigned precommitted)
  88 {
  89         char uuid[64] __attribute((aligned(8)));
  90         struct lvmcache_vginfo *vginfo;
  91         int size;
  92
  93         if (!(vginfo = vginfo_from_vgid((const char *)&vg->id))) {
  94                 stack;
  95                 return;
  96         }
  97
  98         if (vginfo->vgmetadata)
  99                 _free_cached_vgmetadata(vginfo);
 100
 101         if (!(size = export_vg_to_buffer(vg, &vginfo->vgmetadata))) {
 102                 stack;
 103                 return;
 104         }
 105
 106         vginfo->precommitted = precommitted;
 107
 108         if (!id_write_format((const struct id *)vginfo->vgid, uuid, sizeof(uuid))) {
 109                 stack;
 110                 return;
 111         }
 112
 113         log_debug("Metadata cache: VG %s (%s) stored (%d bytes%s).",
 114                   vginfo->vgname, uuid, size,
 115                   precommitted ? ", precommitted" : "");
 116 }
 117
 118 static void _update_cache_info_lock_state(struct lvmcache_info *info,
 119                                           int locked,
 120                                           int *cached_vgmetadata_valid)
 121 {
 122         int was_locked = (info->status & CACHE_LOCKED) ? 1 : 0;
 123
 124         /*
 125          * Cache becomes invalid whenever lock state changes unless
 126          * exclusive VG_GLOBAL is held (i.e. while scanning).
 127          */
 128         if (!vgname_is_locked(VG_GLOBAL) && (was_locked != locked)) {
 129                 info->status |= CACHE_INVALID;
 130                 *cached_vgmetadata_valid = 0;
 131         }
 132
 133         if (locked)
 134                 info->status |= CACHE_LOCKED;
 135         else
 136                 info->status &= ~CACHE_LOCKED;
 137 }
 138
 139 static void _update_cache_vginfo_lock_state(struct lvmcache_vginfo *vginfo,
 140                                             int locked)
 141 {
 142         struct lvmcache_info *info;
 143         int cached_vgmetadata_valid = 1;
 144
 145         dm_list_iterate_items(info, &vginfo->infos)
 146                 _update_cache_info_lock_state(info, locked,
 147                                               &cached_vgmetadata_valid);
 148
 149         if (!cached_vgmetadata_valid)
 150                 _free_cached_vgmetadata(vginfo);
 151 }
 152
 153 static void _update_cache_lock_state(const char *vgname, int locked)
 154 {
 155         struct lvmcache_vginfo *vginfo;
 156
 157         if (!(vginfo = vginfo_from_vgname(vgname, NULL)))
 158                 return;
 159
 160         _update_cache_vginfo_lock_state(vginfo, locked);
 161 }
 162
 163 static void _drop_metadata(const char *vgname)
 164 {
 165         struct lvmcache_vginfo *vginfo;
 166         struct lvmcache_info *info;
 167
 168         if (!(vginfo = vginfo_from_vgname(vgname, NULL)))
 169                 return;
 170
 171         /*
 172          * Invalidate cached PV labels.
 173          * If cached precommitted metadata exists that means we
 174          * already invalidated the PV labels (before caching it)
 175          * and we must not do it again.
 176          */
 177
 178         if (!vginfo->precommitted)
 179                 dm_list_iterate_items(info, &vginfo->infos)
 180                         info->status |= CACHE_INVALID;
 181
 182         _free_cached_vgmetadata(vginfo);
 183 }
 184
 185 void lvmcache_drop_metadata(const char *vgname)
 186 {
 187         /* For VG_ORPHANS, we need to invalidate all labels on orphan PVs. */
 188         if (!strcmp(vgname, VG_ORPHANS)) {
 189                 _drop_metadata(FMT_TEXT_ORPHAN_VG_NAME);
 190                 _drop_metadata(FMT_LVM1_ORPHAN_VG_NAME);
 191                 _drop_metadata(FMT_POOL_ORPHAN_VG_NAME);
 192
 193                 /* Indicate that PVs could now be missing from the cache */
 194                 init_full_scan_done(0);
 195         } else if (!vgname_is_locked(VG_GLOBAL))
 196                 _drop_metadata(vgname);
 197 }
 198
 199 /*
 200  * Ensure vgname2 comes after vgname1 alphabetically.
 201  * Special VG names beginning with '#' don't count.
 202  */
 203 static int _vgname_order_correct(const char *vgname1, const char *vgname2)
 204 {
 205         if ((*vgname1 == '#') || (*vgname2 == '#'))
 206                 return 1;
 207
 208         if (strcmp(vgname1, vgname2) < 0)
 209                 return 1;
 210
 211         return 0;
 212 }
 213
 214 /*
 215  * Ensure VG locks are acquired in alphabetical order.
 216  */
 217 int lvmcache_verify_lock_order(const char *vgname)
 218 {
 219         struct dm_hash_node *n;
 220         const char *vgname2;
 221
 222         if (!_lock_hash)
 223                 return_0;
 224
 225         dm_hash_iterate(n, _lock_hash) {
 226                 if (!dm_hash_get_data(_lock_hash, n))
 227                         return_0;
 228
 229                 vgname2 = dm_hash_get_key(_lock_hash, n);
 230
 231                 if (!_vgname_order_correct(vgname2, vgname)) {
 232                         log_errno(EDEADLK, "Internal error: VG lock %s must "
 233                                   "be requested before %s, not after.",
 234                                   vgname, vgname2);
 235                         return_0;
 236                 }
 237         }
 238
 239         return 1;
 240 }
 241
 242 void lvmcache_lock_vgname(const char *vgname, int read_only __attribute((unused)))
 243 {
 244         if (!_lock_hash && !lvmcache_init()) {
 245                 log_error("Internal cache initialisation failed");
 246                 return;
 247         }
 248
 249         if (dm_hash_lookup(_lock_hash, vgname))
 250                 log_error("Internal error: Nested locking attempted on VG %s.",
 251                           vgname);
 252
 253         if (!dm_hash_insert(_lock_hash, vgname, (void *) 1))
 254                 log_error("Cache locking failure for %s", vgname);
 255
 256         _update_cache_lock_state(vgname, 1);
 257
 258         if (strcmp(vgname, VG_GLOBAL))
 259                 _vgs_locked++;
 260 }
 261
 262 int vgname_is_locked(const char *vgname)
 263 {
 264         if (!_lock_hash)
 265                 return 0;
 266
 267         return dm_hash_lookup(_lock_hash, vgname) ? 1 : 0;
 268 }
 269
 270 void lvmcache_unlock_vgname(const char *vgname)
 271 {
 272         if (!dm_hash_lookup(_lock_hash, vgname))
 273                 log_error("Internal error: Attempt to unlock unlocked VG %s.",
 274                           vgname);
 275
 276         _update_cache_lock_state(vgname, 0);
 277
 278         dm_hash_remove(_lock_hash, vgname);
 279
 280         /* FIXME Do this per-VG */
 281         if (strcmp(vgname, VG_GLOBAL) && !--_vgs_locked)
 282                 dev_close_all();
 283 }
 284
 285 int vgs_locked(void)
 286 {
 287         return _vgs_locked;
 288 }
 289
 290 static void _vginfo_attach_info(struct lvmcache_vginfo *vginfo,
 291                                 struct lvmcache_info *info)
 292 {
 293         if (!vginfo)
 294                 return;
 295
 296         info->vginfo = vginfo;
 297         dm_list_add(&vginfo->infos, &info->list);
 298 }
 299
 300 static void _vginfo_detach_info(struct lvmcache_info *info)
 301 {
 302         if (!dm_list_empty(&info->list)) {
 303                 dm_list_del(&info->list);
 304                 dm_list_init(&info->list);
 305         }
 306
 307         info->vginfo = NULL;
 308 }
 309
 310 /* If vgid supplied, require a match. */
 311 struct lvmcache_vginfo *vginfo_from_vgname(const char *vgname, const char *vgid)
 312 {
 313         struct lvmcache_vginfo *vginfo;
 314
 315         if (!vgname)
 316                 return vginfo_from_vgid(vgid);
 317
 318         if (!_vgname_hash)
 319                 return NULL;
 320
 321         if (!(vginfo = dm_hash_lookup(_vgname_hash, vgname)))
 322                 return NULL;
 323
 324         if (vgid)
 325                 do
 326                         if (!strncmp(vgid, vginfo->vgid, ID_LEN))
 327                                 return vginfo;
 328                 while ((vginfo = vginfo->next));
 329
 330         return vginfo;
 331 }
 332
 333 const struct format_type *fmt_from_vgname(const char *vgname, const char *vgid)
 334 {
 335         struct lvmcache_vginfo *vginfo;
 336         struct lvmcache_info *info;
 337         struct label *label;
 338         struct dm_list *devh, *tmp;
 339         struct dm_list devs;
 340         struct device_list *devl;
 341         char vgid_found[ID_LEN + 1] __attribute((aligned(8)));
 342
 343         if (!(vginfo = vginfo_from_vgname(vgname, vgid)))
 344                 return NULL;
 345
 346         /* This function is normally called before reading metadata so
 347          * we check cached labels here. Unfortunately vginfo is volatile. */
 348         dm_list_init(&devs);
 349         dm_list_iterate_items(info, &vginfo->infos) {
 350                 if (!(devl = dm_malloc(sizeof(*devl)))) {
 351                         log_error("device_list element allocation failed");
 352                         return NULL;
 353                 }
 354                 devl->dev = info->dev;
 355                 dm_list_add(&devs, &devl->list);
 356         }
 357
 358         memcpy(vgid_found, vginfo->vgid, sizeof(vgid_found));
 359
 360         dm_list_iterate_safe(devh, tmp, &devs) {
 361                 devl = dm_list_item(devh, struct device_list);
 362                 label_read(devl->dev, &label, UINT64_C(0));
 363                 dm_list_del(&devl->list);
 364                 dm_free(devl);
 365         }
 366
 367         /* If vginfo changed, caller needs to rescan */
 368         if (!(vginfo = vginfo_from_vgname(vgname, vgid_found)) ||
 369             strncmp(vginfo->vgid, vgid_found, ID_LEN))
 370                 return NULL;
 371
 372         return vginfo->fmt;
 373 }
 374
 375 struct lvmcache_vginfo *vginfo_from_vgid(const char *vgid)
 376 {
 377         struct lvmcache_vginfo *vginfo;
 378         char id[ID_LEN + 1] __attribute((aligned(8)));
 379
 380         if (!_vgid_hash || !vgid)
 381                 return NULL;
 382
 383         /* vgid not necessarily NULL-terminated */
 384         strncpy(&id[0], vgid, ID_LEN);
 385         id[ID_LEN] = '\0';
 386
 387         if (!(vginfo = dm_hash_lookup(_vgid_hash, id)))
 388                 return NULL;
 389
 390         return vginfo;
 391 }
 392
 393 const char *vgname_from_vgid(struct dm_pool *mem, const char *vgid)
 394 {
 395         struct lvmcache_vginfo *vginfo;
 396         const char *vgname = NULL;
 397
 398         if ((vginfo = vginfo_from_vgid(vgid)))
 399                 vgname = vginfo->vgname;
 400
 401         if (mem && vgname)
 402                 return dm_pool_strdup(mem, vgname);
 403
 404         return vgname;
 405 }
 406
 407 static int _info_is_valid(struct lvmcache_info *info)
 408 {
 409         if (info->status & CACHE_INVALID)
 410                 return 0;
 411
 412         /*
 413          * The caller must hold the VG lock to manipulate metadata.
 414          * In a cluster, remote nodes sometimes read metadata in the
 415          * knowledge that the controlling node is holding the lock.
 416          * So if the VG appears to be unlocked here, it should be safe
 417          * to use the cached value.
 418          */
 419         if (info->vginfo && !vgname_is_locked(info->vginfo->vgname))
 420                 return 1;
 421
 422         if (!(info->status & CACHE_LOCKED))
 423                 return 0;
 424
 425         return 1;
 426 }
 427
 428 static int _vginfo_is_valid(struct lvmcache_vginfo *vginfo)
 429 {
 430         struct lvmcache_info *info;
 431
 432         /* Invalid if any info is invalid */
 433         dm_list_iterate_items(info, &vginfo->infos)
 434                 if (!_info_is_valid(info))
 435                         return 0;
 436
 437         return 1;
 438 }
 439
 440 /* vginfo is invalid if it does not contain at least one valid info */
 441 static int _vginfo_is_invalid(struct lvmcache_vginfo *vginfo)
 442 {
 443         struct lvmcache_info *info;
 444
 445         dm_list_iterate_items(info, &vginfo->infos)
 446                 if (_info_is_valid(info))
 447                         return 0;
 448
 449         return 1;
 450 }
 451
 452 /*
 453  * If valid_only is set, data will only be returned if the cached data is
 454  * known still to be valid.
 455  */
 456 struct lvmcache_info *info_from_pvid(const char *pvid, int valid_only)
 457 {
 458         struct lvmcache_info *info;
 459         char id[ID_LEN + 1] __attribute((aligned(8)));
 460
 461         if (!_pvid_hash || !pvid)
 462                 return NULL;
 463
 464         strncpy(&id[0], pvid, ID_LEN);
 465         id[ID_LEN] = '\0';
 466
 467         if (!(info = dm_hash_lookup(_pvid_hash, id)))
 468                 return NULL;
 469
 470         if (valid_only && !_info_is_valid(info))
 471                 return NULL;
 472
 473         return info;
 474 }
 475
 476 static void _rescan_entry(struct lvmcache_info *info)
 477 {
 478         struct label *label;
 479
 480         if (info->status & CACHE_INVALID)
 481                 label_read(info->dev, &label, UINT64_C(0));
 482 }
 483
 484 static int _scan_invalid(void)
 485 {
 486         dm_hash_iter(_pvid_hash, (dm_hash_iterate_fn) _rescan_entry);
 487
 488         return 1;
 489 }
 490
 491 int lvmcache_label_scan(struct cmd_context *cmd, int full_scan)
 492 {
 493         struct label *label;
 494         struct dev_iter *iter;
 495         struct device *dev;
 496         struct format_type *fmt;
 497
 498         int r = 0;
 499
 500         /* Avoid recursion when a PVID can't be found! */
 501         if (_scanning_in_progress)
 502                 return 0;
 503
 504         _scanning_in_progress = 1;
 505
 506         if (!_vgname_hash && !lvmcache_init()) {
 507                 log_error("Internal cache initialisation failed");
 508                 goto out;
 509         }
 510
 511         if (_has_scanned && !full_scan) {
 512                 r = _scan_invalid();
 513                 goto out;
 514         }
 515
 516         if (full_scan == 2 && !refresh_filters(cmd)) {
 517                 log_error("refresh filters failed");
 518                 goto out;
 519         }
 520
 521         if (!(iter = dev_iter_create(cmd->filter, (full_scan == 2) ? 1 : 0))) {
 522                 log_error("dev_iter creation failed");
 523                 goto out;
 524         }
 525
 526         while ((dev = dev_iter_get(iter)))
 527                 label_read(dev, &label, UINT64_C(0));
 528
 529         dev_iter_destroy(iter);
 530
 531         _has_scanned = 1;
 532
 533         /* Perform any format-specific scanning e.g. text files */
 534         dm_list_iterate_items(fmt, &cmd->formats) {
 535                 if (fmt->ops->scan && !fmt->ops->scan(fmt))
 536                         goto out;
 537         }
 538
 539         /*
 540          * If we are a long-lived process, write out the updated persistent
 541          * device cache for the benefit of short-lived processes.
 542          */
 543         if (full_scan == 2 && cmd->is_long_lived && cmd->dump_filter)
 544                 persistent_filter_dump(cmd->filter);
 545
 546         r = 1;
 547
 548       out:
 549         _scanning_in_progress = 0;
 550
 551         return r;
 552 }
 553
 554 struct volume_group *lvmcache_get_vg(const char *vgid, unsigned precommitted)
 555 {
 556         struct lvmcache_vginfo *vginfo;
 557         struct volume_group *vg;
 558         struct format_instance *fid;
 559
 560         if (!vgid || !(vginfo = vginfo_from_vgid(vgid)) || !vginfo->vgmetadata)
 561                 return NULL;
 562
 563         if (!_vginfo_is_valid(vginfo))
 564                 return NULL;
 565
 566         /*
 567          * Don't return cached data if either:
 568          * (i)  precommitted metadata is requested but we don't have it cached
 569          *      - caller should read it off disk;
 570          * (ii) live metadata is requested but we have precommitted metadata cached
 571          *      and no devices are suspended so caller may read it off disk.
 572          *
 573          * If live metadata is requested but we have precommitted metadata cached
 574          * and devices are suspended, we assume this precommitted metadata has
 575          * already been preloaded and committed so it's OK to return it as live.
 576          * Note that we do not clear the PRECOMMITTED flag.
 577          */
 578         if ((precommitted && !vginfo->precommitted) ||
 579             (!precommitted && vginfo->precommitted && !memlock()))
 580                 return NULL;
 581
 582         if (!(fid =  vginfo->fmt->ops->create_instance(vginfo->fmt,
 583                                                        vginfo->vgname,
 584                                                        vgid, NULL)))
 585                 return_NULL;
 586
 587         if (!(vg = import_vg_from_buffer(vginfo->vgmetadata, fid)) ||
 588             !vg_validate(vg)) {
 589                 _free_cached_vgmetadata(vginfo);
 590                 vg_release(vg);
 591                 return_NULL;
 592         }
 593
 594         log_debug("Using cached %smetadata for VG %s.",
 595                   vginfo->precommitted ? "pre-committed" : "", vginfo->vgname);
 596
 597         return vg;
 598 }
 599
 600 struct dm_list *lvmcache_get_vgids(struct cmd_context *cmd, int full_scan)
 601 {
 602         struct dm_list *vgids;
 603         struct lvmcache_vginfo *vginfo;
 604
 605         lvmcache_label_scan(cmd, full_scan);
 606
 607         if (!(vgids = str_list_create(cmd->mem))) {
 608                 log_error("vgids list allocation failed");
 609                 return NULL;
 610         }
 611
 612         dm_list_iterate_items(vginfo, &_vginfos) {
 613                 if (!str_list_add(cmd->mem, vgids,
 614                                   dm_pool_strdup(cmd->mem, vginfo->vgid))) {
 615                         log_error("strlist allocation failed");
 616                         return NULL;
 617                 }
 618         }
 619
 620         return vgids;
 621 }
 622
 623 struct dm_list *lvmcache_get_vgnames(struct cmd_context *cmd, int full_scan)
 624 {
 625         struct dm_list *vgnames;
 626         struct lvmcache_vginfo *vginfo;
 627
 628         lvmcache_label_scan(cmd, full_scan);
 629
 630         if (!(vgnames = str_list_create(cmd->mem))) {
 631                 log_errno(ENOMEM, "vgnames list allocation failed");
 632                 return NULL;
 633         }
 634
 635         dm_list_iterate_items(vginfo, &_vginfos) {
 636                 if (!str_list_add(cmd->mem, vgnames,
 637                                   dm_pool_strdup(cmd->mem, vginfo->vgname))) {
 638                         log_errno(ENOMEM, "strlist allocation failed");
 639                         return NULL;
 640                 }
 641         }
 642
 643         return vgnames;
 644 }
 645
 646 struct dm_list *lvmcache_get_pvids(struct cmd_context *cmd, const char *vgname,
 647                                 const char *vgid)
 648 {
 649         struct dm_list *pvids;
 650         struct lvmcache_vginfo *vginfo;
 651         struct lvmcache_info *info;
 652
 653         if (!(pvids = str_list_create(cmd->mem))) {
 654                 log_error("pvids list allocation failed");
 655                 return NULL;
 656         }
 657
 658         if (!(vginfo = vginfo_from_vgname(vgname, vgid)))
 659                 return pvids;
 660
 661         dm_list_iterate_items(info, &vginfo->infos) {
 662                 if (!str_list_add(cmd->mem, pvids,
 663                                   dm_pool_strdup(cmd->mem, info->dev->pvid))) {
 664                         log_error("strlist allocation failed");
 665                         return NULL;
 666                 }
 667         }
 668
 669         return pvids;
 670 }
 671
 672 struct device *device_from_pvid(struct cmd_context *cmd, struct id *pvid)
 673 {
 674         struct label *label;
 675         struct lvmcache_info *info;
 676
 677         /* Already cached ? */
 678         if ((info = info_from_pvid((char *) pvid, 0))) {
 679                 if (label_read(info->dev, &label, UINT64_C(0))) {
 680                         info = (struct lvmcache_info *) label->info;
 681                         if (id_equal(pvid, (struct id *) &info->dev->pvid))
 682                                 return info->dev;
 683                 }
 684         }
 685
 686         lvmcache_label_scan(cmd, 0);
 687
 688         /* Try again */
 689         if ((info = info_from_pvid((char *) pvid, 0))) {
 690                 if (label_read(info->dev, &label, UINT64_C(0))) {
 691                         info = (struct lvmcache_info *) label->info;
 692                         if (id_equal(pvid, (struct id *) &info->dev->pvid))
 693                                 return info->dev;
 694                 }
 695         }
 696
 697         if (memlock())
 698                 return NULL;
 699
 700         lvmcache_label_scan(cmd, 2);
 701
 702         /* Try again */
 703         if ((info = info_from_pvid((char *) pvid, 0))) {
 704                 if (label_read(info->dev, &label, UINT64_C(0))) {
 705                         info = (struct lvmcache_info *) label->info;
 706                         if (id_equal(pvid, (struct id *) &info->dev->pvid))
 707                                 return info->dev;
 708                 }
 709         }
 710
 711         return NULL;
 712 }
 713
 714 static int _free_vginfo(struct lvmcache_vginfo *vginfo)
 715 {
 716         struct lvmcache_vginfo *primary_vginfo, *vginfo2;
 717         int r = 1;
 718
 719         _free_cached_vgmetadata(vginfo);
 720
 721         vginfo2 = primary_vginfo = vginfo_from_vgname(vginfo->vgname, NULL);
 722
 723         if (vginfo == primary_vginfo) {
 724                 dm_hash_remove(_vgname_hash, vginfo->vgname);
 725                 if (vginfo->next && !dm_hash_insert(_vgname_hash, vginfo->vgname,
 726                                                     vginfo->next)) {
 727                         log_error("_vgname_hash re-insertion for %s failed",
 728                                   vginfo->vgname);
 729                         r = 0;
 730                 }
 731         } else do
 732                 if (vginfo2->next == vginfo) {
 733                         vginfo2->next = vginfo->next;
 734                         break;
 735                 }
 736         while ((vginfo2 = primary_vginfo->next));
 737
 738         if (vginfo->vgname)
 739                 dm_free(vginfo->vgname);
 740
 741         if (vginfo->creation_host)
 742                 dm_free(vginfo->creation_host);
 743
 744         if (*vginfo->vgid && _vgid_hash &&
 745             vginfo_from_vgid(vginfo->vgid) == vginfo)
 746                 dm_hash_remove(_vgid_hash, vginfo->vgid);
 747
 748         dm_list_del(&vginfo->list);
 749
 750         dm_free(vginfo);
 751
 752         return r;
 753 }
 754
 755 /*
 756  * vginfo must be info->vginfo unless info is NULL
 757  */
 758 static int _drop_vginfo(struct lvmcache_info *info, struct lvmcache_vginfo *vginfo)
 759 {
 760         if (info)
 761                 _vginfo_detach_info(info);
 762
 763         /* vginfo still referenced? */
 764         if (!vginfo || is_orphan_vg(vginfo->vgname) ||
 765             !dm_list_empty(&vginfo->infos))
 766                 return 1;
 767
 768         if (!_free_vginfo(vginfo))
 769                 return_0;
 770
 771         return 1;
 772 }
 773
 774 /* Unused
 775 void lvmcache_del(struct lvmcache_info *info)
 776 {
 777         if (info->dev->pvid[0] && _pvid_hash)
 778                 dm_hash_remove(_pvid_hash, info->dev->pvid);
 779
 780         _drop_vginfo(info, info->vginfo);
 781
 782         info->label->labeller->ops->destroy_label(info->label->labeller,
 783                                                 info->label);
 784         dm_free(info);
 785
 786         return;
 787 } */
 788
 789 static int _lvmcache_update_pvid(struct lvmcache_info *info, const char *pvid)
 790 {
 791         /*
 792          * Nothing to do if already stored with same pvid.
 793          */
 794         if (((dm_hash_lookup(_pvid_hash, pvid)) == info) &&
 795             !strcmp(info->dev->pvid, pvid))
 796                 return 1;
 797         if (*info->dev->pvid)
 798                 dm_hash_remove(_pvid_hash, info->dev->pvid);
 799         strncpy(info->dev->pvid, pvid, sizeof(info->dev->pvid));
 800         if (!dm_hash_insert(_pvid_hash, pvid, info)) {
 801                 log_error("_lvmcache_update: pvid insertion failed: %s", pvid);
 802                 return 0;
 803         }
 804
 805         return 1;
 806 }
 807
 808 /*
 809  * vginfo must be info->vginfo unless info is NULL (orphans)
 810  */
 811 static int _lvmcache_update_vgid(struct lvmcache_info *info,
 812                                  struct lvmcache_vginfo *vginfo,
 813                                  const char *vgid)
 814 {
 815         if (!vgid || !vginfo ||
 816             !strncmp(vginfo->vgid, vgid, ID_LEN))
 817                 return 1;
 818
 819         if (vginfo && *vginfo->vgid)
 820                 dm_hash_remove(_vgid_hash, vginfo->vgid);
 821         if (!vgid) {
 822                 log_debug("lvmcache: %s: clearing VGID", info ? dev_name(info->dev) : vginfo->vgname);
 823                 return 1;
 824         }
 825
 826         strncpy(vginfo->vgid, vgid, ID_LEN);
 827         vginfo->vgid[ID_LEN] = '\0';
 828         if (!dm_hash_insert(_vgid_hash, vginfo->vgid, vginfo)) {
 829                 log_error("_lvmcache_update: vgid hash insertion failed: %s",
 830                           vginfo->vgid);
 831                 return 0;
 832         }
 833
 834         if (!is_orphan_vg(vginfo->vgname))
 835                 log_debug("lvmcache: %s: setting %s VGID to %s",
 836                           dev_name(info->dev), vginfo->vgname,
 837                           vginfo->vgid);
 838
 839         return 1;
 840 }
 841
 842 static int _insert_vginfo(struct lvmcache_vginfo *new_vginfo, const char *vgid,
 843                           uint32_t vgstatus, const char *creation_host,
 844                           struct lvmcache_vginfo *primary_vginfo)
 845 {
 846         struct lvmcache_vginfo *last_vginfo = primary_vginfo;
 847         char uuid_primary[64] __attribute((aligned(8)));
 848         char uuid_new[64] __attribute((aligned(8)));
 849         int use_new = 0;
 850
 851         /* Pre-existing VG takes precedence. Unexported VG takes precedence. */
 852         if (primary_vginfo) {
 853                 if (!id_write_format((const struct id *)vgid, uuid_new, sizeof(uuid_new)))
 854                         return_0;
 855
 856                 if (!id_write_format((const struct id *)&primary_vginfo->vgid, uuid_primary,
 857                                      sizeof(uuid_primary)))
 858                         return_0;
 859
 860                 /*
 861                  * If   Primary not exported, new exported => keep
 862                  * Else Primary exported, new not exported => change
 863                  * Else Primary has hostname for this machine => keep
 864                  * Else Primary has no hostname, new has one => change
 865                  * Else New has hostname for this machine => change
 866                  * Else Keep primary.
 867                  */
 868                 if (!(primary_vginfo->status & EXPORTED_VG) &&
 869                     (vgstatus & EXPORTED_VG))
 870                         log_error("WARNING: Duplicate VG name %s: "
 871                                   "Existing %s takes precedence over "
 872                                   "exported %s", new_vginfo->vgname,
 873                                   uuid_primary, uuid_new);
 874                 else if ((primary_vginfo->status & EXPORTED_VG) &&
 875                            !(vgstatus & EXPORTED_VG)) {
 876                         log_error("WARNING: Duplicate VG name %s: "
 877                                   "%s takes precedence over exported %s",
 878                                   new_vginfo->vgname, uuid_new,
 879                                   uuid_primary);
 880                         use_new = 1;
 881                 } else if (primary_vginfo->creation_host &&
 882                            !strcmp(primary_vginfo->creation_host,
 883                                    primary_vginfo->fmt->cmd->hostname))
 884                         log_error("WARNING: Duplicate VG name %s: "
 885                                   "Existing %s (created here) takes precedence "
 886                                   "over %s", new_vginfo->vgname, uuid_primary,
 887                                   uuid_new);
 888                 else if (!primary_vginfo->creation_host && creation_host) {
 889                         log_error("WARNING: Duplicate VG name %s: "
 890                                   "%s (with creation_host) takes precedence over %s",
 891                                   new_vginfo->vgname, uuid_new,
 892                                   uuid_primary);
 893                         use_new = 1;
 894                 } else if (creation_host &&
 895                            !strcmp(creation_host,
 896                                    primary_vginfo->fmt->cmd->hostname)) {
 897                         log_error("WARNING: Duplicate VG name %s: "
 898                                   "%s (created here) takes precedence over %s",
 899                                   new_vginfo->vgname, uuid_new,
 900                                   uuid_primary);
 901                         use_new = 1;
 902                 }
 903
 904                 if (!use_new) {
 905                         while (last_vginfo->next)
 906                                 last_vginfo = last_vginfo->next;
 907                         last_vginfo->next = new_vginfo;
 908                         return 1;
 909                 }
 910
 911                 dm_hash_remove(_vgname_hash, primary_vginfo->vgname);
 912         }
 913
 914         if (!dm_hash_insert(_vgname_hash, new_vginfo->vgname, new_vginfo)) {
 915                 log_error("cache_update: vg hash insertion failed: %s",
 916                         new_vginfo->vgname);
 917                 return 0;
 918         }
 919
 920         if (primary_vginfo)
 921                 new_vginfo->next = primary_vginfo;
 922
 923         return 1;
 924 }
 925
 926 static int _lvmcache_update_vgname(struct lvmcache_info *info,
 927                                    const char *vgname, const char *vgid,
 928                                    uint32_t vgstatus, const char *creation_host,
 929                                    const struct format_type *fmt)
 930 {
 931         struct lvmcache_vginfo *vginfo, *primary_vginfo, *orphan_vginfo;
 932         struct lvmcache_info *info2, *info3;
 933         char mdabuf[32];
 934         // struct lvmcache_vginfo  *old_vginfo, *next;
 935
 936         if (!vgname || (info && info->vginfo && !strcmp(info->vginfo->vgname, vgname)))
 937                 return 1;
 938
 939         /* Remove existing vginfo entry */
 940         if (info)
 941                 _drop_vginfo(info, info->vginfo);
 942
 943         /* Get existing vginfo or create new one */
 944         if (!(vginfo = vginfo_from_vgname(vgname, vgid))) {
 945 /*** FIXME - vginfo ends up duplicated instead of renamed.
 946                 // Renaming?  This lookup fails.
 947                 if ((vginfo = vginfo_from_vgid(vgid))) {
 948                         next = vginfo->next;
 949                         old_vginfo = vginfo_from_vgname(vginfo->vgname, NULL);
 950                         if (old_vginfo == vginfo) {
 951                                 dm_hash_remove(_vgname_hash, old_vginfo->vgname);
 952                                 if (old_vginfo->next) {
 953                                         if (!dm_hash_insert(_vgname_hash, old_vginfo->vgname, old_vginfo->next)) {
 954                                                 log_error("vg hash re-insertion failed: %s",
 955                                                           old_vginfo->vgname);
 956                                                 return 0;
 957                                         }
 958                                 }
 959                         } else do {
 960                                 if (old_vginfo->next == vginfo) {
 961                                         old_vginfo->next = vginfo->next;
 962                                         break;
 963                                 }
 964                         } while ((old_vginfo = old_vginfo->next));
 965                         vginfo->next = NULL;
 966
 967                         dm_free(vginfo->vgname);
 968                         if (!(vginfo->vgname = dm_strdup(vgname))) {
 969                                 log_error("cache vgname alloc failed for %s", vgname);
 970                                 return 0;
 971                         }
 972
 973                         // Rename so can assume new name does not already exist
 974                         if (!dm_hash_insert(_vgname_hash, vginfo->vgname, vginfo->next)) {
 975                                 log_error("vg hash re-insertion failed: %s",
 976                                           vginfo->vgname);
 977                                 return 0;
 978                         }
 979                 } else {
 980 ***/
 981                 if (!(vginfo = dm_malloc(sizeof(*vginfo)))) {
 982                         log_error("lvmcache_update_vgname: list alloc failed");
 983                         return 0;
 984                 }
 985                 memset(vginfo, 0, sizeof(*vginfo));
 986                 if (!(vginfo->vgname = dm_strdup(vgname))) {
 987                         dm_free(vginfo);
 988                         log_error("cache vgname alloc failed for %s", vgname);
 989                         return 0;
 990                 }
 991                 dm_list_init(&vginfo->infos);
 992
 993                 /*
 994                  * If we're scanning and there's an invalidated entry, remove it.
 995                  * Otherwise we risk bogus warnings of duplicate VGs.
 996                  */
 997                 while ((primary_vginfo = vginfo_from_vgname(vgname, NULL)) &&
 998                        _scanning_in_progress && _vginfo_is_invalid(primary_vginfo))
 999                         dm_list_iterate_items_safe(info2, info3, &primary_vginfo->infos) {
1000                                 orphan_vginfo = vginfo_from_vgname(primary_vginfo->fmt->orphan_vg_name, NULL);
1001                                 _drop_vginfo(info2, primary_vginfo);
1002                                 _vginfo_attach_info(orphan_vginfo, info2);
1003                                 if (info2->mdas.n)
1004                                         sprintf(mdabuf, " with %u mdas",
1005                                                 dm_list_size(&info2->mdas));
1006                                 else
1007                                         mdabuf[0] = '\0';
1008                                 log_debug("lvmcache: %s: now in VG %s%s%s%s%s",
1009                                           dev_name(info2->dev),
1010                                           vgname, orphan_vginfo->vgid[0] ? " (" : "",
1011                                           orphan_vginfo->vgid[0] ? orphan_vginfo->vgid : "",
1012                                           orphan_vginfo->vgid[0] ? ")" : "", mdabuf);
1013                 }
1014
1015                 if (!_insert_vginfo(vginfo, vgid, vgstatus, creation_host,
1016                                     primary_vginfo)) {
1017                         dm_free(vginfo->vgname);
1018                         dm_free(vginfo);
1019                         return 0;
1020                 }
1021                 /* Ensure orphans appear last on list_iterate */
1022                 if (is_orphan_vg(vgname))
1023                         dm_list_add(&_vginfos, &vginfo->list);
1024                 else
1025                         dm_list_add_h(&_vginfos, &vginfo->list);
1026 /***
1027                 }
1028 ***/
1029         }
1030
1031         if (info)
1032                 _vginfo_attach_info(vginfo, info);
1033         else if (!_lvmcache_update_vgid(NULL, vginfo, vgid)) /* Orphans */
1034                 return_0;
1035
1036         _update_cache_vginfo_lock_state(vginfo, vgname_is_locked(vgname));
1037
1038         /* FIXME Check consistency of list! */
1039         vginfo->fmt = fmt;
1040
1041         if (info) {
1042                 if (info->mdas.n)
1043                         sprintf(mdabuf, " with %u mdas", dm_list_size(&info->mdas));
1044                 else
1045                         mdabuf[0] = '\0';
1046                 log_debug("lvmcache: %s: now in VG %s%s%s%s%s",
1047                           dev_name(info->dev),
1048                           vgname, vginfo->vgid[0] ? " (" : "",
1049                           vginfo->vgid[0] ? vginfo->vgid : "",
1050                           vginfo->vgid[0] ? ")" : "", mdabuf);
1051         } else
1052                 log_debug("lvmcache: initialised VG %s", vgname);
1053
1054         return 1;
1055 }
1056
1057 static int _lvmcache_update_vgstatus(struct lvmcache_info *info, uint32_t vgstatus,
1058                                      const char *creation_host)
1059 {
1060         if (!info || !info->vginfo)
1061                 return 1;
1062
1063         if ((info->vginfo->status & EXPORTED_VG) != (vgstatus & EXPORTED_VG))
1064                 log_debug("lvmcache: %s: VG %s %s exported",
1065                           dev_name(info->dev), info->vginfo->vgname,
1066                           vgstatus & EXPORTED_VG ? "now" : "no longer");
1067
1068         info->vginfo->status = vgstatus;
1069
1070         if (!creation_host)
1071                 return 1;
1072
1073         if (info->vginfo->creation_host && !strcmp(creation_host,
1074                                                    info->vginfo->creation_host))
1075                 return 1;
1076
1077         if (info->vginfo->creation_host)
1078                 dm_free(info->vginfo->creation_host);
1079
1080         if (!(info->vginfo->creation_host = dm_strdup(creation_host))) {
1081                 log_error("cache creation host alloc failed for %s",
1082                           creation_host);
1083                 return 0;
1084         }
1085
1086         log_debug("lvmcache: %s: VG %s: Set creation host to %s.",
1087                   dev_name(info->dev), info->vginfo->vgname, creation_host);
1088
1089         return 1;
1090 }
1091
1092 int lvmcache_add_orphan_vginfo(const char *vgname, struct format_type *fmt)
1093 {
1094         if (!_lock_hash && !lvmcache_init()) {
1095                 log_error("Internal cache initialisation failed");
1096                 return 0;
1097         }
1098
1099         return _lvmcache_update_vgname(NULL, vgname, vgname, 0, "", fmt);
1100 }
1101
1102 int lvmcache_update_vgname_and_id(struct lvmcache_info *info,
1103                                   const char *vgname, const char *vgid,
1104                                   uint32_t vgstatus, const char *creation_host)
1105 {
1106         if (!vgname && !info->vginfo) {
1107                 log_error("Internal error: NULL vgname handed to cache");
1108                 /* FIXME Remove this */
1109                 vgname = info->fmt->orphan_vg_name;
1110                 vgid = vgname;
1111         }
1112
1113         /* If PV without mdas is already in a real VG, don't make it orphan */
1114         if (is_orphan_vg(vgname) && info->vginfo && !dm_list_size(&info->mdas) &&
1115             !is_orphan_vg(info->vginfo->vgname) && memlock())
1116                 return 1;
1117
1118         /* If moving PV from orphan to real VG, always mark it valid */
1119         if (!is_orphan_vg(vgname))
1120                 info->status &= ~CACHE_INVALID;
1121
1122         if (!_lvmcache_update_vgname(info, vgname, vgid, vgstatus,
1123                                      creation_host, info->fmt) ||
1124             !_lvmcache_update_vgid(info, info->vginfo, vgid) ||
1125             !_lvmcache_update_vgstatus(info, vgstatus, creation_host))
1126                 return_0;
1127
1128         return 1;
1129 }
1130
1131 int lvmcache_update_vg(struct volume_group *vg, unsigned precommitted)
1132 {
1133         struct pv_list *pvl;
1134         struct lvmcache_info *info;
1135         char pvid_s[ID_LEN + 1] __attribute((aligned(8)));
1136
1137         pvid_s[sizeof(pvid_s) - 1] = '\0';
1138
1139         dm_list_iterate_items(pvl, &vg->pvs) {
1140                 strncpy(pvid_s, (char *) &pvl->pv->id, sizeof(pvid_s) - 1);
1141                 /* FIXME Could pvl->pv->dev->pvid ever be different? */
1142                 if ((info = info_from_pvid(pvid_s, 0)) &&
1143                     !lvmcache_update_vgname_and_id(info, vg->name,
1144                                                    (char *) &vg->id,
1145                                                    vg->status, NULL))
1146                         return_0;
1147         }
1148
1149         /* store text representation of vg to cache */
1150         if (vg->cmd->current_settings.cache_vgmetadata)
1151                 _store_metadata(vg, precommitted);
1152
1153         return 1;
1154 }
1155
1156 struct lvmcache_info *lvmcache_add(struct labeller *labeller, const char *pvid,
1157                                    struct device *dev,
1158                                    const char *vgname, const char *vgid,
1159                                    uint32_t vgstatus)
1160 {
1161         struct label *label;
1162         struct lvmcache_info *existing, *info;
1163         char pvid_s[ID_LEN + 1] __attribute((aligned(8)));
1164
1165         if (!_vgname_hash && !lvmcache_init()) {
1166                 log_error("Internal cache initialisation failed");
1167                 return NULL;
1168         }
1169
1170         strncpy(pvid_s, pvid, sizeof(pvid_s));
1171         pvid_s[sizeof(pvid_s) - 1] = '\0';
1172
1173         if (!(existing = info_from_pvid(pvid_s, 0)) &&
1174             !(existing = info_from_pvid(dev->pvid, 0))) {
1175                 if (!(label = label_create(labeller)))
1176                         return_NULL;
1177                 if (!(info = dm_malloc(sizeof(*info)))) {
1178                         log_error("lvmcache_info allocation failed");
1179                         label_destroy(label);
1180                         return NULL;
1181                 }
1182                 memset(info, 0, sizeof(*info));
1183
1184                 label->info = info;
1185                 info->label = label;
1186                 dm_list_init(&info->list);
1187                 info->dev = dev;
1188         } else {
1189                 if (existing->dev != dev) {
1190                         /* Is the existing entry a duplicate pvid e.g. md ? */
1191                         if (dev_subsystem_part_major(existing->dev) &&
1192                             !dev_subsystem_part_major(dev)) {
1193                                 log_very_verbose("Ignoring duplicate PV %s on "
1194                                                  "%s - using %s %s",
1195                                                  pvid, dev_name(dev),
1196                                                  dev_subsystem_name(existing->dev),
1197                                                  dev_name(existing->dev));
1198                                 return NULL;
1199                         } else if (dm_is_dm_major(MAJOR(existing->dev->dev)) &&
1200                                    !dm_is_dm_major(MAJOR(dev->dev))) {
1201                                 log_very_verbose("Ignoring duplicate PV %s on "
1202                                                  "%s - using dm %s",
1203                                                  pvid, dev_name(dev),
1204                                                  dev_name(existing->dev));
1205                                 return NULL;
1206                         } else if (!dev_subsystem_part_major(existing->dev) &&
1207                                    dev_subsystem_part_major(dev))
1208                                 log_very_verbose("Duplicate PV %s on %s - "
1209                                                  "using %s %s", pvid,
1210                                                  dev_name(existing->dev),
1211                                                  dev_subsystem_name(existing->dev),
1212                                                  dev_name(dev));
1213                         else if (!dm_is_dm_major(MAJOR(existing->dev->dev)) &&
1214                                  dm_is_dm_major(MAJOR(dev->dev)))
1215                                 log_very_verbose("Duplicate PV %s on %s - "
1216                                                  "using dm %s", pvid,
1217                                                  dev_name(existing->dev),
1218                                                  dev_name(dev));
1219                         /* FIXME If both dm, check dependencies */
1220                         //else if (dm_is_dm_major(MAJOR(existing->dev->dev)) &&
1221                                  //dm_is_dm_major(MAJOR(dev->dev)))
1222                                  //
1223                         else if (!strcmp(pvid_s, existing->dev->pvid))
1224                                 log_error("Found duplicate PV %s: using %s not "
1225                                           "%s", pvid, dev_name(dev),
1226                                           dev_name(existing->dev));
1227                 }
1228                 if (strcmp(pvid_s, existing->dev->pvid))
1229                         log_debug("Updating pvid cache to %s (%s) from %s (%s)",
1230                                   pvid_s, dev_name(dev),
1231                                   existing->dev->pvid, dev_name(existing->dev));
1232                 /* Switch over to new preferred device */
1233                 existing->dev = dev;
1234                 info = existing;
1235                 /* Has labeller changed? */
1236                 if (info->label->labeller != labeller) {
1237                         label_destroy(info->label);
1238                         if (!(info->label = label_create(labeller)))
1239                                 /* FIXME leaves info without label! */
1240                                 return_NULL;
1241                         info->label->info = info;
1242                 }
1243                 label = info->label;
1244         }
1245
1246         info->fmt = (const struct format_type *) labeller->private;
1247         info->status |= CACHE_INVALID;
1248
1249         if (!_lvmcache_update_pvid(info, pvid_s)) {
1250                 if (!existing) {
1251                         dm_free(info);
1252                         label_destroy(label);
1253                 }
1254                 return NULL;
1255         }
1256
1257         if (!lvmcache_update_vgname_and_id(info, vgname, vgid, vgstatus, NULL)) {
1258                 if (!existing) {
1259                         dm_hash_remove(_pvid_hash, pvid_s);
1260                         strcpy(info->dev->pvid, "");
1261                         dm_free(info);
1262                         label_destroy(label);
1263                 }
1264                 return NULL;
1265         }
1266
1267         return info;
1268 }
1269
1270 static void _lvmcache_destroy_entry(struct lvmcache_info *info)
1271 {
1272         _vginfo_detach_info(info);
1273         strcpy(info->dev->pvid, "");
1274         label_destroy(info->label);
1275         dm_free(info);
1276 }
1277
1278 static void _lvmcache_destroy_vgnamelist(struct lvmcache_vginfo *vginfo)
1279 {
1280         struct lvmcache_vginfo *next;
1281
1282         do {
1283                 next = vginfo->next;
1284                 if (!_free_vginfo(vginfo))
1285                         stack;
1286         } while ((vginfo = next));
1287 }
1288
1289 static void _lvmcache_destroy_lockname(struct dm_hash_node *n)
1290 {
1291         char *vgname;
1292
1293         if (!dm_hash_get_data(_lock_hash, n))
1294                 return;
1295
1296         vgname = dm_hash_get_key(_lock_hash, n);
1297
1298         if (!strcmp(vgname, VG_GLOBAL))
1299                 _vg_global_lock_held = 1;
1300         else
1301                 log_error("Internal error: Volume Group %s was not unlocked",
1302                           dm_hash_get_key(_lock_hash, n));
1303 }
1304
1305 void lvmcache_destroy(struct cmd_context *cmd, int retain_orphans)
1306 {
1307         struct dm_hash_node *n;
1308         log_verbose("Wiping internal VG cache");
1309
1310         _has_scanned = 0;
1311
1312         if (_vgid_hash) {
1313                 dm_hash_destroy(_vgid_hash);
1314                 _vgid_hash = NULL;
1315         }
1316
1317         if (_pvid_hash) {
1318                 dm_hash_iter(_pvid_hash, (dm_hash_iterate_fn) _lvmcache_destroy_entry);
1319                 dm_hash_destroy(_pvid_hash);
1320                 _pvid_hash = NULL;
1321         }
1322
1323         if (_vgname_hash) {
1324                 dm_hash_iter(_vgname_hash,
1325                           (dm_hash_iterate_fn) _lvmcache_destroy_vgnamelist);
1326                 dm_hash_destroy(_vgname_hash);
1327                 _vgname_hash = NULL;
1328         }
1329
1330         if (_lock_hash) {
1331                 dm_hash_iterate(n, _lock_hash)
1332                         _lvmcache_destroy_lockname(n);
1333                 dm_hash_destroy(_lock_hash);
1334                 _lock_hash = NULL;
1335         }
1336
1337         if (!dm_list_empty(&_vginfos))
1338                 log_error("Internal error: _vginfos list should be empty");
1339         dm_list_init(&_vginfos);
1340
1341         if (retain_orphans)
1342                 init_lvmcache_orphans(cmd);
1343 }