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.
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.
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]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
27 #include <sys/zfs_context.h>
28 #include <sys/spa_impl.h>
30 #include <sys/zio_checksum.h>
31 #include <sys/zio_compress.h>
33 #include <sys/dmu_tx.h>
36 #include <sys/vdev_impl.h>
37 #include <sys/metaslab.h>
38 #include <sys/uberblock_impl.h>
41 #include <sys/unique.h>
42 #include <sys/dsl_pool.h>
43 #include <sys/dsl_dir.h>
44 #include <sys/dsl_prop.h>
45 #include <sys/fm/util.h>
46 #include <sys/dsl_scan.h>
47 #include <sys/fs/zfs.h>
48 #include <sys/metaslab_impl.h>
52 #include "zfeature_common.h"
57 * There are four basic locks for managing spa_t structures:
59 * spa_namespace_lock (global mutex)
61 * This lock must be acquired to do any of the following:
63 * - Lookup a spa_t by name
64 * - Add or remove a spa_t from the namespace
65 * - Increase spa_refcount from non-zero
66 * - Check if spa_refcount is zero
68 * - add/remove/attach/detach devices
69 * - Held for the duration of create/destroy/import/export
71 * It does not need to handle recursion. A create or destroy may
72 * reference objects (files or zvols) in other pools, but by
73 * definition they must have an existing reference, and will never need
74 * to lookup a spa_t by name.
76 * spa_refcount (per-spa refcount_t protected by mutex)
78 * This reference count keep track of any active users of the spa_t. The
79 * spa_t cannot be destroyed or freed while this is non-zero. Internally,
80 * the refcount is never really 'zero' - opening a pool implicitly keeps
81 * some references in the DMU. Internally we check against spa_minref, but
82 * present the image of a zero/non-zero value to consumers.
84 * spa_config_lock[] (per-spa array of rwlocks)
86 * This protects the spa_t from config changes, and must be held in
87 * the following circumstances:
89 * - RW_READER to perform I/O to the spa
90 * - RW_WRITER to change the vdev config
92 * The locking order is fairly straightforward:
94 * spa_namespace_lock -> spa_refcount
96 * The namespace lock must be acquired to increase the refcount from 0
97 * or to check if it is zero.
99 * spa_refcount -> spa_config_lock[]
101 * There must be at least one valid reference on the spa_t to acquire
104 * spa_namespace_lock -> spa_config_lock[]
106 * The namespace lock must always be taken before the config lock.
109 * The spa_namespace_lock can be acquired directly and is globally visible.
111 * The namespace is manipulated using the following functions, all of which
112 * require the spa_namespace_lock to be held.
114 * spa_lookup() Lookup a spa_t by name.
116 * spa_add() Create a new spa_t in the namespace.
118 * spa_remove() Remove a spa_t from the namespace. This also
119 * frees up any memory associated with the spa_t.
121 * spa_next() Returns the next spa_t in the system, or the
122 * first if NULL is passed.
124 * spa_evict_all() Shutdown and remove all spa_t structures in
127 * spa_guid_exists() Determine whether a pool/device guid exists.
129 * The spa_refcount is manipulated using the following functions:
131 * spa_open_ref() Adds a reference to the given spa_t. Must be
132 * called with spa_namespace_lock held if the
133 * refcount is currently zero.
135 * spa_close() Remove a reference from the spa_t. This will
136 * not free the spa_t or remove it from the
137 * namespace. No locking is required.
139 * spa_refcount_zero() Returns true if the refcount is currently
140 * zero. Must be called with spa_namespace_lock
143 * The spa_config_lock[] is an array of rwlocks, ordered as follows:
144 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
145 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
147 * To read the configuration, it suffices to hold one of these locks as reader.
148 * To modify the configuration, you must hold all locks as writer. To modify
149 * vdev state without altering the vdev tree's topology (e.g. online/offline),
150 * you must hold SCL_STATE and SCL_ZIO as writer.
152 * We use these distinct config locks to avoid recursive lock entry.
153 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
154 * block allocations (SCL_ALLOC), which may require reading space maps
155 * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
157 * The spa config locks cannot be normal rwlocks because we need the
158 * ability to hand off ownership. For example, SCL_ZIO is acquired
159 * by the issuing thread and later released by an interrupt thread.
160 * They do, however, obey the usual write-wanted semantics to prevent
161 * writer (i.e. system administrator) starvation.
163 * The lock acquisition rules are as follows:
166 * Protects changes to the vdev tree topology, such as vdev
167 * add/remove/attach/detach. Protects the dirty config list
168 * (spa_config_dirty_list) and the set of spares and l2arc devices.
171 * Protects changes to pool state and vdev state, such as vdev
172 * online/offline/fault/degrade/clear. Protects the dirty state list
173 * (spa_state_dirty_list) and global pool state (spa_state).
176 * Protects changes to metaslab groups and classes.
177 * Held as reader by metaslab_alloc() and metaslab_claim().
180 * Held by bp-level zios (those which have no io_vd upon entry)
181 * to prevent changes to the vdev tree. The bp-level zio implicitly
182 * protects all of its vdev child zios, which do not hold SCL_ZIO.
185 * Protects changes to metaslab groups and classes.
186 * Held as reader by metaslab_free(). SCL_FREE is distinct from
187 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
188 * blocks in zio_done() while another i/o that holds either
189 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
192 * Held as reader to prevent changes to the vdev tree during trivial
193 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
194 * other locks, and lower than all of them, to ensure that it's safe
195 * to acquire regardless of caller context.
197 * In addition, the following rules apply:
199 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
200 * The lock ordering is SCL_CONFIG > spa_props_lock.
202 * (b) I/O operations on leaf vdevs. For any zio operation that takes
203 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
204 * or zio_write_phys() -- the caller must ensure that the config cannot
205 * cannot change in the interim, and that the vdev cannot be reopened.
206 * SCL_STATE as reader suffices for both.
208 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
210 * spa_vdev_enter() Acquire the namespace lock and the config lock
213 * spa_vdev_exit() Release the config lock, wait for all I/O
214 * to complete, sync the updated configs to the
215 * cache, and release the namespace lock.
217 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
218 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
219 * locking is, always, based on spa_namespace_lock and spa_config_lock[].
221 * spa_rename() is also implemented within this file since it requires
222 * manipulation of the namespace.
225 static avl_tree_t spa_namespace_avl;
226 kmutex_t spa_namespace_lock;
227 static kcondvar_t spa_namespace_cv;
228 static int spa_active_count;
229 int spa_max_replication_override = SPA_DVAS_PER_BP;
231 static kmutex_t spa_spare_lock;
232 static avl_tree_t spa_spare_avl;
233 static kmutex_t spa_l2cache_lock;
234 static avl_tree_t spa_l2cache_avl;
236 kmem_cache_t *spa_buffer_pool;
240 * ==========================================================================
242 * ==========================================================================
245 spa_config_lock_init(spa_t *spa)
249 for (i = 0; i < SCL_LOCKS; i++) {
250 spa_config_lock_t *scl = &spa->spa_config_lock[i];
251 mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL);
252 cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL);
253 refcount_create(&scl->scl_count);
254 scl->scl_writer = NULL;
255 scl->scl_write_wanted = 0;
260 spa_config_lock_destroy(spa_t *spa)
264 for (i = 0; i < SCL_LOCKS; i++) {
265 spa_config_lock_t *scl = &spa->spa_config_lock[i];
266 mutex_destroy(&scl->scl_lock);
267 cv_destroy(&scl->scl_cv);
268 refcount_destroy(&scl->scl_count);
269 ASSERT(scl->scl_writer == NULL);
270 ASSERT(scl->scl_write_wanted == 0);
275 spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw)
279 for (i = 0; i < SCL_LOCKS; i++) {
280 spa_config_lock_t *scl = &spa->spa_config_lock[i];
281 if (!(locks & (1 << i)))
283 mutex_enter(&scl->scl_lock);
284 if (rw == RW_READER) {
285 if (scl->scl_writer || scl->scl_write_wanted) {
286 mutex_exit(&scl->scl_lock);
287 spa_config_exit(spa, locks ^ (1 << i), tag);
291 ASSERT(scl->scl_writer != curthread);
292 if (!refcount_is_zero(&scl->scl_count)) {
293 mutex_exit(&scl->scl_lock);
294 spa_config_exit(spa, locks ^ (1 << i), tag);
297 scl->scl_writer = curthread;
299 (void) refcount_add(&scl->scl_count, tag);
300 mutex_exit(&scl->scl_lock);
306 spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw)
311 for (i = 0; i < SCL_LOCKS; i++) {
312 spa_config_lock_t *scl = &spa->spa_config_lock[i];
313 if (scl->scl_writer == curthread)
314 wlocks_held |= (1 << i);
315 if (!(locks & (1 << i)))
317 mutex_enter(&scl->scl_lock);
318 if (rw == RW_READER) {
319 while (scl->scl_writer || scl->scl_write_wanted) {
320 cv_wait(&scl->scl_cv, &scl->scl_lock);
323 ASSERT(scl->scl_writer != curthread);
324 while (!refcount_is_zero(&scl->scl_count)) {
325 scl->scl_write_wanted++;
326 cv_wait(&scl->scl_cv, &scl->scl_lock);
327 scl->scl_write_wanted--;
329 scl->scl_writer = curthread;
331 (void) refcount_add(&scl->scl_count, tag);
332 mutex_exit(&scl->scl_lock);
334 ASSERT(wlocks_held <= locks);
338 spa_config_exit(spa_t *spa, int locks, void *tag)
342 for (i = SCL_LOCKS - 1; i >= 0; i--) {
343 spa_config_lock_t *scl = &spa->spa_config_lock[i];
344 if (!(locks & (1 << i)))
346 mutex_enter(&scl->scl_lock);
347 ASSERT(!refcount_is_zero(&scl->scl_count));
348 if (refcount_remove(&scl->scl_count, tag) == 0) {
349 ASSERT(scl->scl_writer == NULL ||
350 scl->scl_writer == curthread);
351 scl->scl_writer = NULL; /* OK in either case */
352 cv_broadcast(&scl->scl_cv);
354 mutex_exit(&scl->scl_lock);
359 spa_config_held(spa_t *spa, int locks, krw_t rw)
361 int i, locks_held = 0;
363 for (i = 0; i < SCL_LOCKS; i++) {
364 spa_config_lock_t *scl = &spa->spa_config_lock[i];
365 if (!(locks & (1 << i)))
367 if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) ||
368 (rw == RW_WRITER && scl->scl_writer == curthread))
369 locks_held |= 1 << i;
376 * ==========================================================================
377 * SPA namespace functions
378 * ==========================================================================
382 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
383 * Returns NULL if no matching spa_t is found.
386 spa_lookup(const char *name)
388 static spa_t search; /* spa_t is large; don't allocate on stack */
394 ASSERT(MUTEX_HELD(&spa_namespace_lock));
397 * If it's a full dataset name, figure out the pool name and
400 cp = strpbrk(name, "/@");
406 (void) strlcpy(search.spa_name, name, sizeof (search.spa_name));
407 spa = avl_find(&spa_namespace_avl, &search, &where);
416 * Create an uninitialized spa_t with the given name. Requires
417 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
418 * exist by calling spa_lookup() first.
421 spa_add(const char *name, nvlist_t *config, const char *altroot)
424 spa_config_dirent_t *dp;
427 ASSERT(MUTEX_HELD(&spa_namespace_lock));
429 spa = kmem_zalloc(sizeof (spa_t), KM_PUSHPAGE | KM_NODEBUG);
431 mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
432 mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
433 mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL);
434 mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL);
435 mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL);
436 mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL);
437 mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL);
438 mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL);
439 mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL);
441 cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL);
442 cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL);
443 cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL);
444 cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL);
446 for (t = 0; t < TXG_SIZE; t++)
447 bplist_create(&spa->spa_free_bplist[t]);
449 (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name));
450 spa->spa_state = POOL_STATE_UNINITIALIZED;
451 spa->spa_freeze_txg = UINT64_MAX;
452 spa->spa_final_txg = UINT64_MAX;
453 spa->spa_load_max_txg = UINT64_MAX;
455 spa->spa_proc_state = SPA_PROC_NONE;
457 refcount_create(&spa->spa_refcount);
458 spa_config_lock_init(spa);
460 avl_add(&spa_namespace_avl, spa);
463 * Set the alternate root, if there is one.
466 spa->spa_root = spa_strdup(altroot);
471 * Every pool starts with the default cachefile
473 list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t),
474 offsetof(spa_config_dirent_t, scd_link));
476 dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_PUSHPAGE);
477 dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path);
478 list_insert_head(&spa->spa_config_list, dp);
480 VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME,
483 if (config != NULL) {
486 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ,
488 VERIFY(nvlist_dup(features, &spa->spa_label_features,
492 VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0);
495 if (spa->spa_label_features == NULL) {
496 VERIFY(nvlist_alloc(&spa->spa_label_features, NV_UNIQUE_NAME,
504 * Removes a spa_t from the namespace, freeing up any memory used. Requires
505 * spa_namespace_lock. This is called only after the spa_t has been closed and
509 spa_remove(spa_t *spa)
511 spa_config_dirent_t *dp;
514 ASSERT(MUTEX_HELD(&spa_namespace_lock));
515 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
517 nvlist_free(spa->spa_config_splitting);
519 avl_remove(&spa_namespace_avl, spa);
520 cv_broadcast(&spa_namespace_cv);
523 spa_strfree(spa->spa_root);
527 while ((dp = list_head(&spa->spa_config_list)) != NULL) {
528 list_remove(&spa->spa_config_list, dp);
529 if (dp->scd_path != NULL)
530 spa_strfree(dp->scd_path);
531 kmem_free(dp, sizeof (spa_config_dirent_t));
534 list_destroy(&spa->spa_config_list);
536 nvlist_free(spa->spa_label_features);
537 nvlist_free(spa->spa_load_info);
538 spa_config_set(spa, NULL);
540 refcount_destroy(&spa->spa_refcount);
542 spa_config_lock_destroy(spa);
544 for (t = 0; t < TXG_SIZE; t++)
545 bplist_destroy(&spa->spa_free_bplist[t]);
547 cv_destroy(&spa->spa_async_cv);
548 cv_destroy(&spa->spa_proc_cv);
549 cv_destroy(&spa->spa_scrub_io_cv);
550 cv_destroy(&spa->spa_suspend_cv);
552 mutex_destroy(&spa->spa_async_lock);
553 mutex_destroy(&spa->spa_errlist_lock);
554 mutex_destroy(&spa->spa_errlog_lock);
555 mutex_destroy(&spa->spa_history_lock);
556 mutex_destroy(&spa->spa_proc_lock);
557 mutex_destroy(&spa->spa_props_lock);
558 mutex_destroy(&spa->spa_scrub_lock);
559 mutex_destroy(&spa->spa_suspend_lock);
560 mutex_destroy(&spa->spa_vdev_top_lock);
562 kmem_free(spa, sizeof (spa_t));
566 * Given a pool, return the next pool in the namespace, or NULL if there is
567 * none. If 'prev' is NULL, return the first pool.
570 spa_next(spa_t *prev)
572 ASSERT(MUTEX_HELD(&spa_namespace_lock));
575 return (AVL_NEXT(&spa_namespace_avl, prev));
577 return (avl_first(&spa_namespace_avl));
581 * ==========================================================================
582 * SPA refcount functions
583 * ==========================================================================
587 * Add a reference to the given spa_t. Must have at least one reference, or
588 * have the namespace lock held.
591 spa_open_ref(spa_t *spa, void *tag)
593 ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref ||
594 MUTEX_HELD(&spa_namespace_lock));
595 (void) refcount_add(&spa->spa_refcount, tag);
599 * Remove a reference to the given spa_t. Must have at least one reference, or
600 * have the namespace lock held.
603 spa_close(spa_t *spa, void *tag)
605 ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref ||
606 MUTEX_HELD(&spa_namespace_lock));
607 (void) refcount_remove(&spa->spa_refcount, tag);
611 * Check to see if the spa refcount is zero. Must be called with
612 * spa_namespace_lock held. We really compare against spa_minref, which is the
613 * number of references acquired when opening a pool
616 spa_refcount_zero(spa_t *spa)
618 ASSERT(MUTEX_HELD(&spa_namespace_lock));
620 return (refcount_count(&spa->spa_refcount) == spa->spa_minref);
624 * ==========================================================================
625 * SPA spare and l2cache tracking
626 * ==========================================================================
630 * Hot spares and cache devices are tracked using the same code below,
631 * for 'auxiliary' devices.
634 typedef struct spa_aux {
642 spa_aux_compare(const void *a, const void *b)
644 const spa_aux_t *sa = a;
645 const spa_aux_t *sb = b;
647 if (sa->aux_guid < sb->aux_guid)
649 else if (sa->aux_guid > sb->aux_guid)
656 spa_aux_add(vdev_t *vd, avl_tree_t *avl)
662 search.aux_guid = vd->vdev_guid;
663 if ((aux = avl_find(avl, &search, &where)) != NULL) {
666 aux = kmem_zalloc(sizeof (spa_aux_t), KM_PUSHPAGE);
667 aux->aux_guid = vd->vdev_guid;
669 avl_insert(avl, aux, where);
674 spa_aux_remove(vdev_t *vd, avl_tree_t *avl)
680 search.aux_guid = vd->vdev_guid;
681 aux = avl_find(avl, &search, &where);
685 if (--aux->aux_count == 0) {
686 avl_remove(avl, aux);
687 kmem_free(aux, sizeof (spa_aux_t));
688 } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) {
689 aux->aux_pool = 0ULL;
694 spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl)
696 spa_aux_t search, *found;
698 search.aux_guid = guid;
699 found = avl_find(avl, &search, NULL);
703 *pool = found->aux_pool;
710 *refcnt = found->aux_count;
715 return (found != NULL);
719 spa_aux_activate(vdev_t *vd, avl_tree_t *avl)
721 spa_aux_t search, *found;
724 search.aux_guid = vd->vdev_guid;
725 found = avl_find(avl, &search, &where);
726 ASSERT(found != NULL);
727 ASSERT(found->aux_pool == 0ULL);
729 found->aux_pool = spa_guid(vd->vdev_spa);
733 * Spares are tracked globally due to the following constraints:
735 * - A spare may be part of multiple pools.
736 * - A spare may be added to a pool even if it's actively in use within
738 * - A spare in use in any pool can only be the source of a replacement if
739 * the target is a spare in the same pool.
741 * We keep track of all spares on the system through the use of a reference
742 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
743 * spare, then we bump the reference count in the AVL tree. In addition, we set
744 * the 'vdev_isspare' member to indicate that the device is a spare (active or
745 * inactive). When a spare is made active (used to replace a device in the
746 * pool), we also keep track of which pool its been made a part of.
748 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
749 * called under the spa_namespace lock as part of vdev reconfiguration. The
750 * separate spare lock exists for the status query path, which does not need to
751 * be completely consistent with respect to other vdev configuration changes.
755 spa_spare_compare(const void *a, const void *b)
757 return (spa_aux_compare(a, b));
761 spa_spare_add(vdev_t *vd)
763 mutex_enter(&spa_spare_lock);
764 ASSERT(!vd->vdev_isspare);
765 spa_aux_add(vd, &spa_spare_avl);
766 vd->vdev_isspare = B_TRUE;
767 mutex_exit(&spa_spare_lock);
771 spa_spare_remove(vdev_t *vd)
773 mutex_enter(&spa_spare_lock);
774 ASSERT(vd->vdev_isspare);
775 spa_aux_remove(vd, &spa_spare_avl);
776 vd->vdev_isspare = B_FALSE;
777 mutex_exit(&spa_spare_lock);
781 spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt)
785 mutex_enter(&spa_spare_lock);
786 found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl);
787 mutex_exit(&spa_spare_lock);
793 spa_spare_activate(vdev_t *vd)
795 mutex_enter(&spa_spare_lock);
796 ASSERT(vd->vdev_isspare);
797 spa_aux_activate(vd, &spa_spare_avl);
798 mutex_exit(&spa_spare_lock);
802 * Level 2 ARC devices are tracked globally for the same reasons as spares.
803 * Cache devices currently only support one pool per cache device, and so
804 * for these devices the aux reference count is currently unused beyond 1.
808 spa_l2cache_compare(const void *a, const void *b)
810 return (spa_aux_compare(a, b));
814 spa_l2cache_add(vdev_t *vd)
816 mutex_enter(&spa_l2cache_lock);
817 ASSERT(!vd->vdev_isl2cache);
818 spa_aux_add(vd, &spa_l2cache_avl);
819 vd->vdev_isl2cache = B_TRUE;
820 mutex_exit(&spa_l2cache_lock);
824 spa_l2cache_remove(vdev_t *vd)
826 mutex_enter(&spa_l2cache_lock);
827 ASSERT(vd->vdev_isl2cache);
828 spa_aux_remove(vd, &spa_l2cache_avl);
829 vd->vdev_isl2cache = B_FALSE;
830 mutex_exit(&spa_l2cache_lock);
834 spa_l2cache_exists(uint64_t guid, uint64_t *pool)
838 mutex_enter(&spa_l2cache_lock);
839 found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl);
840 mutex_exit(&spa_l2cache_lock);
846 spa_l2cache_activate(vdev_t *vd)
848 mutex_enter(&spa_l2cache_lock);
849 ASSERT(vd->vdev_isl2cache);
850 spa_aux_activate(vd, &spa_l2cache_avl);
851 mutex_exit(&spa_l2cache_lock);
855 * ==========================================================================
857 * ==========================================================================
861 * Lock the given spa_t for the purpose of adding or removing a vdev.
862 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
863 * It returns the next transaction group for the spa_t.
866 spa_vdev_enter(spa_t *spa)
868 mutex_enter(&spa->spa_vdev_top_lock);
869 mutex_enter(&spa_namespace_lock);
870 return (spa_vdev_config_enter(spa));
874 * Internal implementation for spa_vdev_enter(). Used when a vdev
875 * operation requires multiple syncs (i.e. removing a device) while
876 * keeping the spa_namespace_lock held.
879 spa_vdev_config_enter(spa_t *spa)
881 ASSERT(MUTEX_HELD(&spa_namespace_lock));
883 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
885 return (spa_last_synced_txg(spa) + 1);
889 * Used in combination with spa_vdev_config_enter() to allow the syncing
890 * of multiple transactions without releasing the spa_namespace_lock.
893 spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag)
895 int config_changed = B_FALSE;
897 ASSERT(MUTEX_HELD(&spa_namespace_lock));
898 ASSERT(txg > spa_last_synced_txg(spa));
900 spa->spa_pending_vdev = NULL;
905 vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE);
907 if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) {
908 config_changed = B_TRUE;
909 spa->spa_config_generation++;
913 * Verify the metaslab classes.
915 ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0);
916 ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0);
918 spa_config_exit(spa, SCL_ALL, spa);
921 * Panic the system if the specified tag requires it. This
922 * is useful for ensuring that configurations are updated
925 if (zio_injection_enabled)
926 zio_handle_panic_injection(spa, tag, 0);
929 * Note: this txg_wait_synced() is important because it ensures
930 * that there won't be more than one config change per txg.
931 * This allows us to use the txg as the generation number.
934 txg_wait_synced(spa->spa_dsl_pool, txg);
937 ASSERT(!vd->vdev_detached || vd->vdev_dtl_smo.smo_object == 0);
938 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
940 spa_config_exit(spa, SCL_ALL, spa);
944 * If the config changed, update the config cache.
947 spa_config_sync(spa, B_FALSE, B_TRUE);
951 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
952 * locking of spa_vdev_enter(), we also want make sure the transactions have
953 * synced to disk, and then update the global configuration cache with the new
957 spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error)
959 spa_vdev_config_exit(spa, vd, txg, error, FTAG);
960 mutex_exit(&spa_namespace_lock);
961 mutex_exit(&spa->spa_vdev_top_lock);
967 * Lock the given spa_t for the purpose of changing vdev state.
970 spa_vdev_state_enter(spa_t *spa, int oplocks)
972 int locks = SCL_STATE_ALL | oplocks;
975 * Root pools may need to read of the underlying devfs filesystem
976 * when opening up a vdev. Unfortunately if we're holding the
977 * SCL_ZIO lock it will result in a deadlock when we try to issue
978 * the read from the root filesystem. Instead we "prefetch"
979 * the associated vnodes that we need prior to opening the
980 * underlying devices and cache them so that we can prevent
981 * any I/O when we are doing the actual open.
983 if (spa_is_root(spa)) {
984 int low = locks & ~(SCL_ZIO - 1);
985 int high = locks & ~low;
987 spa_config_enter(spa, high, spa, RW_WRITER);
988 vdev_hold(spa->spa_root_vdev);
989 spa_config_enter(spa, low, spa, RW_WRITER);
991 spa_config_enter(spa, locks, spa, RW_WRITER);
993 spa->spa_vdev_locks = locks;
997 spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error)
999 boolean_t config_changed = B_FALSE;
1001 if (vd != NULL || error == 0)
1002 vdev_dtl_reassess(vd ? vd->vdev_top : spa->spa_root_vdev,
1006 vdev_state_dirty(vd->vdev_top);
1007 config_changed = B_TRUE;
1008 spa->spa_config_generation++;
1011 if (spa_is_root(spa))
1012 vdev_rele(spa->spa_root_vdev);
1014 ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL);
1015 spa_config_exit(spa, spa->spa_vdev_locks, spa);
1018 * If anything changed, wait for it to sync. This ensures that,
1019 * from the system administrator's perspective, zpool(1M) commands
1020 * are synchronous. This is important for things like zpool offline:
1021 * when the command completes, you expect no further I/O from ZFS.
1024 txg_wait_synced(spa->spa_dsl_pool, 0);
1027 * If the config changed, update the config cache.
1029 if (config_changed) {
1030 mutex_enter(&spa_namespace_lock);
1031 spa_config_sync(spa, B_FALSE, B_TRUE);
1032 mutex_exit(&spa_namespace_lock);
1039 * ==========================================================================
1040 * Miscellaneous functions
1041 * ==========================================================================
1045 spa_activate_mos_feature(spa_t *spa, const char *feature)
1047 (void) nvlist_add_boolean(spa->spa_label_features, feature);
1048 vdev_config_dirty(spa->spa_root_vdev);
1052 spa_deactivate_mos_feature(spa_t *spa, const char *feature)
1054 (void) nvlist_remove_all(spa->spa_label_features, feature);
1055 vdev_config_dirty(spa->spa_root_vdev);
1062 spa_rename(const char *name, const char *newname)
1068 * Lookup the spa_t and grab the config lock for writing. We need to
1069 * actually open the pool so that we can sync out the necessary labels.
1070 * It's OK to call spa_open() with the namespace lock held because we
1071 * allow recursive calls for other reasons.
1073 mutex_enter(&spa_namespace_lock);
1074 if ((err = spa_open(name, &spa, FTAG)) != 0) {
1075 mutex_exit(&spa_namespace_lock);
1079 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1081 avl_remove(&spa_namespace_avl, spa);
1082 (void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name));
1083 avl_add(&spa_namespace_avl, spa);
1086 * Sync all labels to disk with the new names by marking the root vdev
1087 * dirty and waiting for it to sync. It will pick up the new pool name
1090 vdev_config_dirty(spa->spa_root_vdev);
1092 spa_config_exit(spa, SCL_ALL, FTAG);
1094 txg_wait_synced(spa->spa_dsl_pool, 0);
1097 * Sync the updated config cache.
1099 spa_config_sync(spa, B_FALSE, B_TRUE);
1101 spa_close(spa, FTAG);
1103 mutex_exit(&spa_namespace_lock);
1109 * Return the spa_t associated with given pool_guid, if it exists. If
1110 * device_guid is non-zero, determine whether the pool exists *and* contains
1111 * a device with the specified device_guid.
1114 spa_by_guid(uint64_t pool_guid, uint64_t device_guid)
1117 avl_tree_t *t = &spa_namespace_avl;
1119 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1121 for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) {
1122 if (spa->spa_state == POOL_STATE_UNINITIALIZED)
1124 if (spa->spa_root_vdev == NULL)
1126 if (spa_guid(spa) == pool_guid) {
1127 if (device_guid == 0)
1130 if (vdev_lookup_by_guid(spa->spa_root_vdev,
1131 device_guid) != NULL)
1135 * Check any devices we may be in the process of adding.
1137 if (spa->spa_pending_vdev) {
1138 if (vdev_lookup_by_guid(spa->spa_pending_vdev,
1139 device_guid) != NULL)
1149 * Determine whether a pool with the given pool_guid exists.
1152 spa_guid_exists(uint64_t pool_guid, uint64_t device_guid)
1154 return (spa_by_guid(pool_guid, device_guid) != NULL);
1158 spa_strdup(const char *s)
1164 new = kmem_alloc(len + 1, KM_PUSHPAGE);
1172 spa_strfree(char *s)
1174 kmem_free(s, strlen(s) + 1);
1178 spa_get_random(uint64_t range)
1184 (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t));
1190 spa_generate_guid(spa_t *spa)
1192 uint64_t guid = spa_get_random(-1ULL);
1195 while (guid == 0 || spa_guid_exists(spa_guid(spa), guid))
1196 guid = spa_get_random(-1ULL);
1198 while (guid == 0 || spa_guid_exists(guid, 0))
1199 guid = spa_get_random(-1ULL);
1206 sprintf_blkptr(char *buf, const blkptr_t *bp)
1209 char *checksum = NULL;
1210 char *compress = NULL;
1213 if (BP_GET_TYPE(bp) & DMU_OT_NEWTYPE) {
1214 dmu_object_byteswap_t bswap =
1215 DMU_OT_BYTESWAP(BP_GET_TYPE(bp));
1216 (void) snprintf(type, sizeof (type), "bswap %s %s",
1217 DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) ?
1218 "metadata" : "data",
1219 dmu_ot_byteswap[bswap].ob_name);
1221 (void) strlcpy(type, dmu_ot[BP_GET_TYPE(bp)].ot_name,
1224 checksum = zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name;
1225 compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name;
1228 SPRINTF_BLKPTR(snprintf, ' ', buf, bp, type, checksum, compress);
1232 spa_freeze(spa_t *spa)
1234 uint64_t freeze_txg = 0;
1236 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1237 if (spa->spa_freeze_txg == UINT64_MAX) {
1238 freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE;
1239 spa->spa_freeze_txg = freeze_txg;
1241 spa_config_exit(spa, SCL_ALL, FTAG);
1242 if (freeze_txg != 0)
1243 txg_wait_synced(spa_get_dsl(spa), freeze_txg);
1247 * This is a stripped-down version of strtoull, suitable only for converting
1248 * lowercase hexidecimal numbers that don't overflow.
1251 strtonum(const char *str, char **nptr)
1257 while ((c = *str) != '\0') {
1258 if (c >= '0' && c <= '9')
1260 else if (c >= 'a' && c <= 'f')
1261 digit = 10 + c - 'a';
1272 *nptr = (char *)str;
1278 * ==========================================================================
1279 * Accessor functions
1280 * ==========================================================================
1284 spa_shutting_down(spa_t *spa)
1286 return (spa->spa_async_suspended);
1290 spa_get_dsl(spa_t *spa)
1292 return (spa->spa_dsl_pool);
1296 spa_is_initializing(spa_t *spa)
1298 return (spa->spa_is_initializing);
1302 spa_get_rootblkptr(spa_t *spa)
1304 return (&spa->spa_ubsync.ub_rootbp);
1308 spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp)
1310 spa->spa_uberblock.ub_rootbp = *bp;
1314 spa_altroot(spa_t *spa, char *buf, size_t buflen)
1316 if (spa->spa_root == NULL)
1319 (void) strncpy(buf, spa->spa_root, buflen);
1323 spa_sync_pass(spa_t *spa)
1325 return (spa->spa_sync_pass);
1329 spa_name(spa_t *spa)
1331 return (spa->spa_name);
1335 spa_guid(spa_t *spa)
1338 * If we fail to parse the config during spa_load(), we can go through
1339 * the error path (which posts an ereport) and end up here with no root
1340 * vdev. We stash the original pool guid in 'spa_config_guid' to handle
1343 if (spa->spa_root_vdev != NULL)
1344 return (spa->spa_root_vdev->vdev_guid);
1346 return (spa->spa_config_guid);
1350 spa_load_guid(spa_t *spa)
1353 * This is a GUID that exists solely as a reference for the
1354 * purposes of the arc. It is generated at load time, and
1355 * is never written to persistent storage.
1357 return (spa->spa_load_guid);
1361 spa_last_synced_txg(spa_t *spa)
1363 return (spa->spa_ubsync.ub_txg);
1367 spa_first_txg(spa_t *spa)
1369 return (spa->spa_first_txg);
1373 spa_syncing_txg(spa_t *spa)
1375 return (spa->spa_syncing_txg);
1379 spa_state(spa_t *spa)
1381 return (spa->spa_state);
1385 spa_load_state(spa_t *spa)
1387 return (spa->spa_load_state);
1391 spa_freeze_txg(spa_t *spa)
1393 return (spa->spa_freeze_txg);
1398 spa_get_asize(spa_t *spa, uint64_t lsize)
1401 * The worst case is single-sector max-parity RAID-Z blocks, in which
1402 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
1403 * times the size; so just assume that. Add to this the fact that
1404 * we can have up to 3 DVAs per bp, and one more factor of 2 because
1405 * the block may be dittoed with up to 3 DVAs by ddt_sync().
1407 return (lsize * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2);
1411 spa_get_dspace(spa_t *spa)
1413 return (spa->spa_dspace);
1417 spa_update_dspace(spa_t *spa)
1419 spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) +
1420 ddt_get_dedup_dspace(spa);
1424 * Return the failure mode that has been set to this pool. The default
1425 * behavior will be to block all I/Os when a complete failure occurs.
1428 spa_get_failmode(spa_t *spa)
1430 return (spa->spa_failmode);
1434 spa_suspended(spa_t *spa)
1436 return (spa->spa_suspended);
1440 spa_version(spa_t *spa)
1442 return (spa->spa_ubsync.ub_version);
1446 spa_deflate(spa_t *spa)
1448 return (spa->spa_deflate);
1452 spa_normal_class(spa_t *spa)
1454 return (spa->spa_normal_class);
1458 spa_log_class(spa_t *spa)
1460 return (spa->spa_log_class);
1464 spa_max_replication(spa_t *spa)
1467 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
1468 * handle BPs with more than one DVA allocated. Set our max
1469 * replication level accordingly.
1471 if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS)
1473 return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override));
1477 spa_prev_software_version(spa_t *spa)
1479 return (spa->spa_prev_software_version);
1483 dva_get_dsize_sync(spa_t *spa, const dva_t *dva)
1485 uint64_t asize = DVA_GET_ASIZE(dva);
1486 uint64_t dsize = asize;
1488 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
1490 if (asize != 0 && spa->spa_deflate) {
1491 vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));
1492 dsize = (asize >> SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio;
1499 bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp)
1504 for (d = 0; d < SPA_DVAS_PER_BP; d++)
1505 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
1511 bp_get_dsize(spa_t *spa, const blkptr_t *bp)
1516 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
1518 for (d = 0; d < SPA_DVAS_PER_BP; d++)
1519 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
1521 spa_config_exit(spa, SCL_VDEV, FTAG);
1527 * ==========================================================================
1528 * Initialization and Termination
1529 * ==========================================================================
1533 spa_name_compare(const void *a1, const void *a2)
1535 const spa_t *s1 = a1;
1536 const spa_t *s2 = a2;
1539 s = strcmp(s1->spa_name, s2->spa_name);
1556 mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL);
1557 mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL);
1558 mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL);
1559 cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL);
1561 avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t),
1562 offsetof(spa_t, spa_avl));
1564 avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t),
1565 offsetof(spa_aux_t, aux_avl));
1567 avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t),
1568 offsetof(spa_aux_t, aux_avl));
1570 spa_mode_global = mode;
1578 vdev_cache_stat_init();
1581 zpool_feature_init();
1593 vdev_cache_stat_fini();
1601 avl_destroy(&spa_namespace_avl);
1602 avl_destroy(&spa_spare_avl);
1603 avl_destroy(&spa_l2cache_avl);
1605 cv_destroy(&spa_namespace_cv);
1606 mutex_destroy(&spa_namespace_lock);
1607 mutex_destroy(&spa_spare_lock);
1608 mutex_destroy(&spa_l2cache_lock);
1612 * Return whether this pool has slogs. No locking needed.
1613 * It's not a problem if the wrong answer is returned as it's only for
1614 * performance and not correctness
1617 spa_has_slogs(spa_t *spa)
1619 return (spa->spa_log_class->mc_rotor != NULL);
1623 spa_get_log_state(spa_t *spa)
1625 return (spa->spa_log_state);
1629 spa_set_log_state(spa_t *spa, spa_log_state_t state)
1631 spa->spa_log_state = state;
1635 spa_is_root(spa_t *spa)
1637 return (spa->spa_is_root);
1641 spa_writeable(spa_t *spa)
1643 return (!!(spa->spa_mode & FWRITE));
1647 spa_mode(spa_t *spa)
1649 return (spa->spa_mode);
1653 spa_bootfs(spa_t *spa)
1655 return (spa->spa_bootfs);
1659 spa_delegation(spa_t *spa)
1661 return (spa->spa_delegation);
1665 spa_meta_objset(spa_t *spa)
1667 return (spa->spa_meta_objset);
1671 spa_dedup_checksum(spa_t *spa)
1673 return (spa->spa_dedup_checksum);
1677 * Reset pool scan stat per scan pass (or reboot).
1680 spa_scan_stat_init(spa_t *spa)
1682 /* data not stored on disk */
1683 spa->spa_scan_pass_start = gethrestime_sec();
1684 spa->spa_scan_pass_exam = 0;
1685 vdev_scan_stat_init(spa->spa_root_vdev);
1689 * Get scan stats for zpool status reports
1692 spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps)
1694 dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL;
1696 if (scn == NULL || scn->scn_phys.scn_func == POOL_SCAN_NONE)
1698 bzero(ps, sizeof (pool_scan_stat_t));
1700 /* data stored on disk */
1701 ps->pss_func = scn->scn_phys.scn_func;
1702 ps->pss_start_time = scn->scn_phys.scn_start_time;
1703 ps->pss_end_time = scn->scn_phys.scn_end_time;
1704 ps->pss_to_examine = scn->scn_phys.scn_to_examine;
1705 ps->pss_examined = scn->scn_phys.scn_examined;
1706 ps->pss_to_process = scn->scn_phys.scn_to_process;
1707 ps->pss_processed = scn->scn_phys.scn_processed;
1708 ps->pss_errors = scn->scn_phys.scn_errors;
1709 ps->pss_state = scn->scn_phys.scn_state;
1711 /* data not stored on disk */
1712 ps->pss_pass_start = spa->spa_scan_pass_start;
1713 ps->pss_pass_exam = spa->spa_scan_pass_exam;
1719 spa_debug_enabled(spa_t *spa)
1721 return (spa->spa_debug);
1724 #if defined(_KERNEL) && defined(HAVE_SPL)
1725 /* Namespace manipulation */
1726 EXPORT_SYMBOL(spa_lookup);
1727 EXPORT_SYMBOL(spa_add);
1728 EXPORT_SYMBOL(spa_remove);
1729 EXPORT_SYMBOL(spa_next);
1731 /* Refcount functions */
1732 EXPORT_SYMBOL(spa_open_ref);
1733 EXPORT_SYMBOL(spa_close);
1734 EXPORT_SYMBOL(spa_refcount_zero);
1736 /* Pool configuration lock */
1737 EXPORT_SYMBOL(spa_config_tryenter);
1738 EXPORT_SYMBOL(spa_config_enter);
1739 EXPORT_SYMBOL(spa_config_exit);
1740 EXPORT_SYMBOL(spa_config_held);
1742 /* Pool vdev add/remove lock */
1743 EXPORT_SYMBOL(spa_vdev_enter);
1744 EXPORT_SYMBOL(spa_vdev_exit);
1746 /* Pool vdev state change lock */
1747 EXPORT_SYMBOL(spa_vdev_state_enter);
1748 EXPORT_SYMBOL(spa_vdev_state_exit);
1750 /* Accessor functions */
1751 EXPORT_SYMBOL(spa_shutting_down);
1752 EXPORT_SYMBOL(spa_get_dsl);
1753 EXPORT_SYMBOL(spa_get_rootblkptr);
1754 EXPORT_SYMBOL(spa_set_rootblkptr);
1755 EXPORT_SYMBOL(spa_altroot);
1756 EXPORT_SYMBOL(spa_sync_pass);
1757 EXPORT_SYMBOL(spa_name);
1758 EXPORT_SYMBOL(spa_guid);
1759 EXPORT_SYMBOL(spa_last_synced_txg);
1760 EXPORT_SYMBOL(spa_first_txg);
1761 EXPORT_SYMBOL(spa_syncing_txg);
1762 EXPORT_SYMBOL(spa_version);
1763 EXPORT_SYMBOL(spa_state);
1764 EXPORT_SYMBOL(spa_load_state);
1765 EXPORT_SYMBOL(spa_freeze_txg);
1766 EXPORT_SYMBOL(spa_get_asize);
1767 EXPORT_SYMBOL(spa_get_dspace);
1768 EXPORT_SYMBOL(spa_update_dspace);
1769 EXPORT_SYMBOL(spa_deflate);
1770 EXPORT_SYMBOL(spa_normal_class);
1771 EXPORT_SYMBOL(spa_log_class);
1772 EXPORT_SYMBOL(spa_max_replication);
1773 EXPORT_SYMBOL(spa_prev_software_version);
1774 EXPORT_SYMBOL(spa_get_failmode);
1775 EXPORT_SYMBOL(spa_suspended);
1776 EXPORT_SYMBOL(spa_bootfs);
1777 EXPORT_SYMBOL(spa_delegation);
1778 EXPORT_SYMBOL(spa_meta_objset);
1780 /* Miscellaneous support routines */
1781 EXPORT_SYMBOL(spa_rename);
1782 EXPORT_SYMBOL(spa_guid_exists);
1783 EXPORT_SYMBOL(spa_strdup);
1784 EXPORT_SYMBOL(spa_strfree);
1785 EXPORT_SYMBOL(spa_get_random);
1786 EXPORT_SYMBOL(spa_generate_guid);
1787 EXPORT_SYMBOL(sprintf_blkptr);
1788 EXPORT_SYMBOL(spa_freeze);
1789 EXPORT_SYMBOL(spa_upgrade);
1790 EXPORT_SYMBOL(spa_evict_all);
1791 EXPORT_SYMBOL(spa_lookup_by_guid);
1792 EXPORT_SYMBOL(spa_has_spare);
1793 EXPORT_SYMBOL(dva_get_dsize_sync);
1794 EXPORT_SYMBOL(bp_get_dsize_sync);
1795 EXPORT_SYMBOL(bp_get_dsize);
1796 EXPORT_SYMBOL(spa_has_slogs);
1797 EXPORT_SYMBOL(spa_is_root);
1798 EXPORT_SYMBOL(spa_writeable);
1799 EXPORT_SYMBOL(spa_mode);
1801 EXPORT_SYMBOL(spa_namespace_lock);