module/zfs/spa_config.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
  25  * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
  26  * Copyright 2017 Joyent, Inc.
  27  */
  28
  29 #include <sys/spa.h>
  30 #include <sys/fm/fs/zfs.h>
  31 #include <sys/spa_impl.h>
  32 #include <sys/nvpair.h>
  33 #include <sys/uio.h>
  34 #include <sys/fs/zfs.h>
  35 #include <sys/vdev_impl.h>
  36 #include <sys/zfs_ioctl.h>
  37 #include <sys/systeminfo.h>
  38 #include <sys/sunddi.h>
  39 #include <sys/zfeature.h>
  40 #ifdef _KERNEL
  41 #include <sys/kobj.h>
  42 #include <sys/zone.h>
  43 #endif
  44
  45 /*
  46  * Pool configuration repository.
  47  *
  48  * Pool configuration is stored as a packed nvlist on the filesystem.  By
  49  * default, all pools are stored in /etc/zfs/zpool.cache and loaded on boot
  50  * (when the ZFS module is loaded).  Pools can also have the 'cachefile'
  51  * property set that allows them to be stored in an alternate location until
  52  * the control of external software.
  53  *
  54  * For each cache file, we have a single nvlist which holds all the
  55  * configuration information.  When the module loads, we read this information
  56  * from /etc/zfs/zpool.cache and populate the SPA namespace.  This namespace is
  57  * maintained independently in spa.c.  Whenever the namespace is modified, or
  58  * the configuration of a pool is changed, we call spa_write_cachefile(), which
  59  * walks through all the active pools and writes the configuration to disk.
  60  */
  61
  62 static uint64_t spa_config_generation = 1;
  63
  64 /*
  65  * This can be overridden in userland to preserve an alternate namespace for
  66  * userland pools when doing testing.
  67  */
  68 char *spa_config_path = ZPOOL_CACHE;
  69 int zfs_autoimport_disable = 1;
  70
  71 /*
  72  * Called when the module is first loaded, this routine loads the configuration
  73  * file into the SPA namespace.  It does not actually open or load the pools; it
  74  * only populates the namespace.
  75  */
  76 void
  77 spa_config_load(void)
  78 {
  79         void *buf = NULL;
  80         nvlist_t *nvlist, *child;
  81         nvpair_t *nvpair;
  82         char *pathname;
  83         struct _buf *file;
  84         uint64_t fsize;
  85
  86 #ifdef _KERNEL
  87         if (zfs_autoimport_disable)
  88                 return;
  89 #endif
  90
  91         /*
  92          * Open the configuration file.
  93          */
  94         pathname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
  95
  96         (void) snprintf(pathname, MAXPATHLEN, "%s%s",
  97             (rootdir != NULL) ? "./" : "", spa_config_path);
  98
  99         file = kobj_open_file(pathname);
 100
 101         kmem_free(pathname, MAXPATHLEN);
 102
 103         if (file == (struct _buf *)-1)
 104                 return;
 105
 106         if (kobj_get_filesize(file, &fsize) != 0)
 107                 goto out;
 108
 109         buf = kmem_alloc(fsize, KM_SLEEP);
 110
 111         /*
 112          * Read the nvlist from the file.
 113          */
 114         if (kobj_read_file(file, buf, fsize, 0) < 0)
 115                 goto out;
 116
 117         /*
 118          * Unpack the nvlist.
 119          */
 120         if (nvlist_unpack(buf, fsize, &nvlist, KM_SLEEP) != 0)
 121                 goto out;
 122
 123         /*
 124          * Iterate over all elements in the nvlist, creating a new spa_t for
 125          * each one with the specified configuration.
 126          */
 127         mutex_enter(&spa_namespace_lock);
 128         nvpair = NULL;
 129         while ((nvpair = nvlist_next_nvpair(nvlist, nvpair)) != NULL) {
 130                 if (nvpair_type(nvpair) != DATA_TYPE_NVLIST)
 131                         continue;
 132
 133                 child = fnvpair_value_nvlist(nvpair);
 134
 135                 if (spa_lookup(nvpair_name(nvpair)) != NULL)
 136                         continue;
 137                 (void) spa_add(nvpair_name(nvpair), child, NULL);
 138         }
 139         mutex_exit(&spa_namespace_lock);
 140
 141         nvlist_free(nvlist);
 142
 143 out:
 144         if (buf != NULL)
 145                 kmem_free(buf, fsize);
 146
 147         kobj_close_file(file);
 148 }
 149
 150 static int
 151 spa_config_remove(spa_config_dirent_t *dp)
 152 {
 153 #if defined(__linux__) && defined(_KERNEL)
 154         int error, flags = FWRITE | FTRUNC;
 155         uio_seg_t seg = UIO_SYSSPACE;
 156         vnode_t *vp;
 157
 158         error = vn_open(dp->scd_path, seg, flags, 0644, &vp, 0, 0);
 159         if (error == 0) {
 160                 (void) VOP_FSYNC(vp, FSYNC, kcred, NULL);
 161                 (void) VOP_CLOSE(vp, 0, 1, 0, kcred, NULL);
 162         }
 163
 164         return (error);
 165 #else
 166         return (vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE));
 167 #endif
 168 }
 169
 170 static int
 171 spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
 172 {
 173         size_t buflen;
 174         char *buf;
 175         vnode_t *vp;
 176         int oflags = FWRITE | FTRUNC | FCREAT | FOFFMAX;
 177         char *temp;
 178         int err;
 179
 180         /*
 181          * If the nvlist is empty (NULL), then remove the old cachefile.
 182          */
 183         if (nvl == NULL) {
 184                 err = spa_config_remove(dp);
 185                 if (err == ENOENT)
 186                         err = 0;
 187
 188                 return (err);
 189         }
 190
 191         /*
 192          * Pack the configuration into a buffer.
 193          */
 194         buf = fnvlist_pack(nvl, &buflen);
 195         temp = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
 196
 197 #if defined(__linux__) && defined(_KERNEL)
 198         /*
 199          * Write the configuration to disk.  Due to the complexity involved
 200          * in performing a rename and remove from within the kernel the file
 201          * is instead truncated and overwritten in place.  This way we always
 202          * have a consistent view of the data or a zero length file.
 203          */
 204         err = vn_open(dp->scd_path, UIO_SYSSPACE, oflags, 0644, &vp, 0, 0);
 205         if (err == 0) {
 206                 err = vn_rdwr(UIO_WRITE, vp, buf, buflen, 0,
 207                     UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, NULL);
 208                 if (err == 0)
 209                         err = VOP_FSYNC(vp, FSYNC, kcred, NULL);
 210
 211                 (void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL);
 212                 if (err)
 213                         (void) spa_config_remove(dp);
 214         }
 215 #else
 216         /*
 217          * Write the configuration to disk.  We need to do the traditional
 218          * 'write to temporary file, sync, move over original' to make sure we
 219          * always have a consistent view of the data.
 220          */
 221         (void) snprintf(temp, MAXPATHLEN, "%s.tmp", dp->scd_path);
 222
 223         err = vn_open(temp, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0);
 224         if (err == 0) {
 225                 err = vn_rdwr(UIO_WRITE, vp, buf, buflen, 0, UIO_SYSSPACE,
 226                     0, RLIM64_INFINITY, kcred, NULL);
 227                 if (err == 0)
 228                         err = VOP_FSYNC(vp, FSYNC, kcred, NULL);
 229                 if (err == 0)
 230                         err = vn_rename(temp, dp->scd_path, UIO_SYSSPACE);
 231                 (void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL);
 232         }
 233
 234         (void) vn_remove(temp, UIO_SYSSPACE, RMFILE);
 235 #endif
 236
 237         fnvlist_pack_free(buf, buflen);
 238         kmem_free(temp, MAXPATHLEN);
 239         return (err);
 240 }
 241
 242 /*
 243  * Synchronize pool configuration to disk.  This must be called with the
 244  * namespace lock held. Synchronizing the pool cache is typically done after
 245  * the configuration has been synced to the MOS. This exposes a window where
 246  * the MOS config will have been updated but the cache file has not. If
 247  * the system were to crash at that instant then the cached config may not
 248  * contain the correct information to open the pool and an explicit import
 249  * would be required.
 250  */
 251 void
 252 spa_write_cachefile(spa_t *target, boolean_t removing, boolean_t postsysevent)
 253 {
 254         spa_config_dirent_t *dp, *tdp;
 255         nvlist_t *nvl;
 256         char *pool_name;
 257         boolean_t ccw_failure;
 258         int error = 0;
 259
 260         ASSERT(MUTEX_HELD(&spa_namespace_lock));
 261
 262         if (rootdir == NULL || !(spa_mode_global & FWRITE))
 263                 return;
 264
 265         /*
 266          * Iterate over all cachefiles for the pool, past or present.  When the
 267          * cachefile is changed, the new one is pushed onto this list, allowing
 268          * us to update previous cachefiles that no longer contain this pool.
 269          */
 270         ccw_failure = B_FALSE;
 271         for (dp = list_head(&target->spa_config_list); dp != NULL;
 272             dp = list_next(&target->spa_config_list, dp)) {
 273                 spa_t *spa = NULL;
 274                 if (dp->scd_path == NULL)
 275                         continue;
 276
 277                 /*
 278                  * Iterate over all pools, adding any matching pools to 'nvl'.
 279                  */
 280                 nvl = NULL;
 281                 while ((spa = spa_next(spa)) != NULL) {
 282                         /*
 283                          * Skip over our own pool if we're about to remove
 284                          * ourselves from the spa namespace or any pool that
 285                          * is readonly. Since we cannot guarantee that a
 286                          * readonly pool would successfully import upon reboot,
 287                          * we don't allow them to be written to the cache file.
 288                          */
 289                         if ((spa == target && removing) ||
 290                             !spa_writeable(spa))
 291                                 continue;
 292
 293                         mutex_enter(&spa->spa_props_lock);
 294                         tdp = list_head(&spa->spa_config_list);
 295                         if (spa->spa_config == NULL ||
 296                             tdp == NULL ||
 297                             tdp->scd_path == NULL ||
 298                             strcmp(tdp->scd_path, dp->scd_path) != 0) {
 299                                 mutex_exit(&spa->spa_props_lock);
 300                                 continue;
 301                         }
 302
 303                         if (nvl == NULL)
 304                                 nvl = fnvlist_alloc();
 305
 306                         if (spa->spa_import_flags & ZFS_IMPORT_TEMP_NAME)
 307                                 pool_name = fnvlist_lookup_string(
 308                                     spa->spa_config, ZPOOL_CONFIG_POOL_NAME);
 309                         else
 310                                 pool_name = spa_name(spa);
 311
 312                         fnvlist_add_nvlist(nvl, pool_name, spa->spa_config);
 313                         mutex_exit(&spa->spa_props_lock);
 314                 }
 315
 316                 error = spa_config_write(dp, nvl);
 317                 if (error != 0)
 318                         ccw_failure = B_TRUE;
 319                 nvlist_free(nvl);
 320         }
 321
 322         if (ccw_failure) {
 323                 /*
 324                  * Keep trying so that configuration data is
 325                  * written if/when any temporary filesystem
 326                  * resource issues are resolved.
 327                  */
 328                 if (target->spa_ccw_fail_time == 0) {
 329                         zfs_ereport_post(FM_EREPORT_ZFS_CONFIG_CACHE_WRITE,
 330                             target, NULL, NULL, NULL, 0, 0);
 331                 }
 332                 target->spa_ccw_fail_time = gethrtime();
 333                 spa_async_request(target, SPA_ASYNC_CONFIG_UPDATE);
 334         } else {
 335                 /*
 336                  * Do not rate limit future attempts to update
 337                  * the config cache.
 338                  */
 339                 target->spa_ccw_fail_time = 0;
 340         }
 341
 342         /*
 343          * Remove any config entries older than the current one.
 344          */
 345         dp = list_head(&target->spa_config_list);
 346         while ((tdp = list_next(&target->spa_config_list, dp)) != NULL) {
 347                 list_remove(&target->spa_config_list, tdp);
 348                 if (tdp->scd_path != NULL)
 349                         spa_strfree(tdp->scd_path);
 350                 kmem_free(tdp, sizeof (spa_config_dirent_t));
 351         }
 352
 353         spa_config_generation++;
 354
 355         if (postsysevent)
 356                 spa_event_notify(target, NULL, NULL, ESC_ZFS_CONFIG_SYNC);
 357 }
 358
 359 /*
 360  * Sigh.  Inside a local zone, we don't have access to /etc/zfs/zpool.cache,
 361  * and we don't want to allow the local zone to see all the pools anyway.
 362  * So we have to invent the ZFS_IOC_CONFIG ioctl to grab the configuration
 363  * information for all pool visible within the zone.
 364  */
 365 nvlist_t *
 366 spa_all_configs(uint64_t *generation)
 367 {
 368         nvlist_t *pools;
 369         spa_t *spa = NULL;
 370
 371         if (*generation == spa_config_generation)
 372                 return (NULL);
 373
 374         pools = fnvlist_alloc();
 375
 376         mutex_enter(&spa_namespace_lock);
 377         while ((spa = spa_next(spa)) != NULL) {
 378                 if (INGLOBALZONE(curproc) ||
 379                     zone_dataset_visible(spa_name(spa), NULL)) {
 380                         mutex_enter(&spa->spa_props_lock);
 381                         fnvlist_add_nvlist(pools, spa_name(spa),
 382                             spa->spa_config);
 383                         mutex_exit(&spa->spa_props_lock);
 384                 }
 385         }
 386         *generation = spa_config_generation;
 387         mutex_exit(&spa_namespace_lock);
 388
 389         return (pools);
 390 }
 391
 392 void
 393 spa_config_set(spa_t *spa, nvlist_t *config)
 394 {
 395         mutex_enter(&spa->spa_props_lock);
 396         if (spa->spa_config != NULL && spa->spa_config != config)
 397                 nvlist_free(spa->spa_config);
 398         spa->spa_config = config;
 399         mutex_exit(&spa->spa_props_lock);
 400 }
 401
 402 /*
 403  * Generate the pool's configuration based on the current in-core state.
 404  *
 405  * We infer whether to generate a complete config or just one top-level config
 406  * based on whether vd is the root vdev.
 407  */
 408 nvlist_t *
 409 spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg, int getstats)
 410 {
 411         nvlist_t *config, *nvroot;
 412         vdev_t *rvd = spa->spa_root_vdev;
 413         unsigned long hostid = 0;
 414         boolean_t locked = B_FALSE;
 415         uint64_t split_guid;
 416         char *pool_name;
 417
 418         if (vd == NULL) {
 419                 vd = rvd;
 420                 locked = B_TRUE;
 421                 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER);
 422         }
 423
 424         ASSERT(spa_config_held(spa, SCL_CONFIG | SCL_STATE, RW_READER) ==
 425             (SCL_CONFIG | SCL_STATE));
 426
 427         /*
 428          * If txg is -1, report the current value of spa->spa_config_txg.
 429          */
 430         if (txg == -1ULL)
 431                 txg = spa->spa_config_txg;
 432
 433         /*
 434          * Originally, users had to handle spa namespace collisions by either
 435          * exporting the already imported pool or by specifying a new name for
 436          * the pool with a conflicting name. In the case of root pools from
 437          * virtual guests, neither approach to collision resolution is
 438          * reasonable. This is addressed by extending the new name syntax with
 439          * an option to specify that the new name is temporary. When specified,
 440          * ZFS_IMPORT_TEMP_NAME will be set in spa->spa_import_flags to tell us
 441          * to use the previous name, which we do below.
 442          */
 443         if (spa->spa_import_flags & ZFS_IMPORT_TEMP_NAME) {
 444                 VERIFY0(nvlist_lookup_string(spa->spa_config,
 445                     ZPOOL_CONFIG_POOL_NAME, &pool_name));
 446         } else
 447                 pool_name = spa_name(spa);
 448
 449         config = fnvlist_alloc();
 450
 451         fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, spa_version(spa));
 452         fnvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, pool_name);
 453         fnvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, spa_state(spa));
 454         fnvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, txg);
 455         fnvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, spa_guid(spa));
 456         fnvlist_add_uint64(config, ZPOOL_CONFIG_ERRATA, spa->spa_errata);
 457         if (spa->spa_comment != NULL)
 458                 fnvlist_add_string(config, ZPOOL_CONFIG_COMMENT,
 459                     spa->spa_comment);
 460
 461         hostid = spa_get_hostid();
 462         if (hostid != 0)
 463                 fnvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, hostid);
 464         fnvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, utsname()->nodename);
 465
 466         int config_gen_flags = 0;
 467         if (vd != rvd) {
 468                 fnvlist_add_uint64(config, ZPOOL_CONFIG_TOP_GUID,
 469                     vd->vdev_top->vdev_guid);
 470                 fnvlist_add_uint64(config, ZPOOL_CONFIG_GUID,
 471                     vd->vdev_guid);
 472                 if (vd->vdev_isspare)
 473                         fnvlist_add_uint64(config,
 474                             ZPOOL_CONFIG_IS_SPARE, 1ULL);
 475                 if (vd->vdev_islog)
 476                         fnvlist_add_uint64(config,
 477                             ZPOOL_CONFIG_IS_LOG, 1ULL);
 478                 vd = vd->vdev_top;              /* label contains top config */
 479         } else {
 480                 /*
 481                  * Only add the (potentially large) split information
 482                  * in the mos config, and not in the vdev labels
 483                  */
 484                 if (spa->spa_config_splitting != NULL)
 485                         fnvlist_add_nvlist(config, ZPOOL_CONFIG_SPLIT,
 486                             spa->spa_config_splitting);
 487
 488                 fnvlist_add_boolean(config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS);
 489
 490                 config_gen_flags |= VDEV_CONFIG_MOS;
 491         }
 492
 493         /*
 494          * Add the top-level config.  We even add this on pools which
 495          * don't support holes in the namespace.
 496          */
 497         vdev_top_config_generate(spa, config);
 498
 499         /*
 500          * If we're splitting, record the original pool's guid.
 501          */
 502         if (spa->spa_config_splitting != NULL &&
 503             nvlist_lookup_uint64(spa->spa_config_splitting,
 504             ZPOOL_CONFIG_SPLIT_GUID, &split_guid) == 0) {
 505                 fnvlist_add_uint64(config, ZPOOL_CONFIG_SPLIT_GUID, split_guid);
 506         }
 507
 508         nvroot = vdev_config_generate(spa, vd, getstats, config_gen_flags);
 509         fnvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot);
 510         nvlist_free(nvroot);
 511
 512         /*
 513          * Store what's necessary for reading the MOS in the label.
 514          */
 515         fnvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ,
 516             spa->spa_label_features);
 517
 518         if (getstats && spa_load_state(spa) == SPA_LOAD_NONE) {
 519                 ddt_histogram_t *ddh;
 520                 ddt_stat_t *dds;
 521                 ddt_object_t *ddo;
 522
 523                 ddh = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP);
 524                 ddt_get_dedup_histogram(spa, ddh);
 525                 fnvlist_add_uint64_array(config,
 526                     ZPOOL_CONFIG_DDT_HISTOGRAM,
 527                     (uint64_t *)ddh, sizeof (*ddh) / sizeof (uint64_t));
 528                 kmem_free(ddh, sizeof (ddt_histogram_t));
 529
 530                 ddo = kmem_zalloc(sizeof (ddt_object_t), KM_SLEEP);
 531                 ddt_get_dedup_object_stats(spa, ddo);
 532                 fnvlist_add_uint64_array(config,
 533                     ZPOOL_CONFIG_DDT_OBJ_STATS,
 534                     (uint64_t *)ddo, sizeof (*ddo) / sizeof (uint64_t));
 535                 kmem_free(ddo, sizeof (ddt_object_t));
 536
 537                 dds = kmem_zalloc(sizeof (ddt_stat_t), KM_SLEEP);
 538                 ddt_get_dedup_stats(spa, dds);
 539                 fnvlist_add_uint64_array(config,
 540                     ZPOOL_CONFIG_DDT_STATS,
 541                     (uint64_t *)dds, sizeof (*dds) / sizeof (uint64_t));
 542                 kmem_free(dds, sizeof (ddt_stat_t));
 543         }
 544
 545         if (locked)
 546                 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG);
 547
 548         return (config);
 549 }
 550
 551 /*
 552  * Update all disk labels, generate a fresh config based on the current
 553  * in-core state, and sync the global config cache (do not sync the config
 554  * cache if this is a booting rootpool).
 555  */
 556 void
 557 spa_config_update(spa_t *spa, int what)
 558 {
 559         vdev_t *rvd = spa->spa_root_vdev;
 560         uint64_t txg;
 561         int c;
 562
 563         ASSERT(MUTEX_HELD(&spa_namespace_lock));
 564
 565         spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
 566         txg = spa_last_synced_txg(spa) + 1;
 567         if (what == SPA_CONFIG_UPDATE_POOL) {
 568                 vdev_config_dirty(rvd);
 569         } else {
 570                 /*
 571                  * If we have top-level vdevs that were added but have
 572                  * not yet been prepared for allocation, do that now.
 573                  * (It's safe now because the config cache is up to date,
 574                  * so it will be able to translate the new DVAs.)
 575                  * See comments in spa_vdev_add() for full details.
 576                  */
 577                 for (c = 0; c < rvd->vdev_children; c++) {
 578                         vdev_t *tvd = rvd->vdev_child[c];
 579                         if (tvd->vdev_ms_array == 0)
 580                                 vdev_metaslab_set_size(tvd);
 581                         vdev_expand(tvd, txg);
 582                 }
 583         }
 584         spa_config_exit(spa, SCL_ALL, FTAG);
 585
 586         /*
 587          * Wait for the mosconfig to be regenerated and synced.
 588          */
 589         txg_wait_synced(spa->spa_dsl_pool, txg);
 590
 591         /*
 592          * Update the global config cache to reflect the new mosconfig.
 593          */
 594         if (!spa->spa_is_root) {
 595                 spa_write_cachefile(spa, B_FALSE,
 596                     what != SPA_CONFIG_UPDATE_POOL);
 597         }
 598
 599         if (what == SPA_CONFIG_UPDATE_POOL)
 600                 spa_config_update(spa, SPA_CONFIG_UPDATE_VDEVS);
 601 }
 602
 603 #if defined(_KERNEL)
 604 EXPORT_SYMBOL(spa_config_load);
 605 EXPORT_SYMBOL(spa_all_configs);
 606 EXPORT_SYMBOL(spa_config_set);
 607 EXPORT_SYMBOL(spa_config_generate);
 608 EXPORT_SYMBOL(spa_config_update);
 609
 610 module_param(spa_config_path, charp, 0444);
 611 MODULE_PARM_DESC(spa_config_path, "SPA config file (/etc/zfs/zpool.cache)");
 612
 613 module_param(zfs_autoimport_disable, int, 0644);
 614 MODULE_PARM_DESC(zfs_autoimport_disable, "Disable pool import at module load");
 615
 616 #endif