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) 2011, 2015 by Delphix. All rights reserved.
24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
28 #include <sys/zfs_context.h>
29 #include <sys/spa_impl.h>
30 #include <sys/spa_boot.h>
32 #include <sys/zio_checksum.h>
33 #include <sys/zio_compress.h>
35 #include <sys/dmu_tx.h>
38 #include <sys/vdev_impl.h>
39 #include <sys/metaslab.h>
40 #include <sys/uberblock_impl.h>
43 #include <sys/unique.h>
44 #include <sys/dsl_pool.h>
45 #include <sys/dsl_dir.h>
46 #include <sys/dsl_prop.h>
47 #include <sys/dsl_scan.h>
48 #include <sys/fs/zfs.h>
49 #include <sys/metaslab_impl.h>
53 #include "zfeature_common.h"
58 * There are four basic locks for managing spa_t structures:
60 * spa_namespace_lock (global mutex)
62 * This lock must be acquired to do any of the following:
64 * - Lookup a spa_t by name
65 * - Add or remove a spa_t from the namespace
66 * - Increase spa_refcount from non-zero
67 * - Check if spa_refcount is zero
69 * - add/remove/attach/detach devices
70 * - Held for the duration of create/destroy/import/export
72 * It does not need to handle recursion. A create or destroy may
73 * reference objects (files or zvols) in other pools, but by
74 * definition they must have an existing reference, and will never need
75 * to lookup a spa_t by name.
77 * spa_refcount (per-spa refcount_t protected by mutex)
79 * This reference count keep track of any active users of the spa_t. The
80 * spa_t cannot be destroyed or freed while this is non-zero. Internally,
81 * the refcount is never really 'zero' - opening a pool implicitly keeps
82 * some references in the DMU. Internally we check against spa_minref, but
83 * present the image of a zero/non-zero value to consumers.
85 * spa_config_lock[] (per-spa array of rwlocks)
87 * This protects the spa_t from config changes, and must be held in
88 * the following circumstances:
90 * - RW_READER to perform I/O to the spa
91 * - RW_WRITER to change the vdev config
93 * The locking order is fairly straightforward:
95 * spa_namespace_lock -> spa_refcount
97 * The namespace lock must be acquired to increase the refcount from 0
98 * or to check if it is zero.
100 * spa_refcount -> spa_config_lock[]
102 * There must be at least one valid reference on the spa_t to acquire
105 * spa_namespace_lock -> spa_config_lock[]
107 * The namespace lock must always be taken before the config lock.
110 * The spa_namespace_lock can be acquired directly and is globally visible.
112 * The namespace is manipulated using the following functions, all of which
113 * require the spa_namespace_lock to be held.
115 * spa_lookup() Lookup a spa_t by name.
117 * spa_add() Create a new spa_t in the namespace.
119 * spa_remove() Remove a spa_t from the namespace. This also
120 * frees up any memory associated with the spa_t.
122 * spa_next() Returns the next spa_t in the system, or the
123 * first if NULL is passed.
125 * spa_evict_all() Shutdown and remove all spa_t structures in
128 * spa_guid_exists() Determine whether a pool/device guid exists.
130 * The spa_refcount is manipulated using the following functions:
132 * spa_open_ref() Adds a reference to the given spa_t. Must be
133 * called with spa_namespace_lock held if the
134 * refcount is currently zero.
136 * spa_close() Remove a reference from the spa_t. This will
137 * not free the spa_t or remove it from the
138 * namespace. No locking is required.
140 * spa_refcount_zero() Returns true if the refcount is currently
141 * zero. Must be called with spa_namespace_lock
144 * The spa_config_lock[] is an array of rwlocks, ordered as follows:
145 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
146 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
148 * To read the configuration, it suffices to hold one of these locks as reader.
149 * To modify the configuration, you must hold all locks as writer. To modify
150 * vdev state without altering the vdev tree's topology (e.g. online/offline),
151 * you must hold SCL_STATE and SCL_ZIO as writer.
153 * We use these distinct config locks to avoid recursive lock entry.
154 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
155 * block allocations (SCL_ALLOC), which may require reading space maps
156 * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
158 * The spa config locks cannot be normal rwlocks because we need the
159 * ability to hand off ownership. For example, SCL_ZIO is acquired
160 * by the issuing thread and later released by an interrupt thread.
161 * They do, however, obey the usual write-wanted semantics to prevent
162 * writer (i.e. system administrator) starvation.
164 * The lock acquisition rules are as follows:
167 * Protects changes to the vdev tree topology, such as vdev
168 * add/remove/attach/detach. Protects the dirty config list
169 * (spa_config_dirty_list) and the set of spares and l2arc devices.
172 * Protects changes to pool state and vdev state, such as vdev
173 * online/offline/fault/degrade/clear. Protects the dirty state list
174 * (spa_state_dirty_list) and global pool state (spa_state).
177 * Protects changes to metaslab groups and classes.
178 * Held as reader by metaslab_alloc() and metaslab_claim().
181 * Held by bp-level zios (those which have no io_vd upon entry)
182 * to prevent changes to the vdev tree. The bp-level zio implicitly
183 * protects all of its vdev child zios, which do not hold SCL_ZIO.
186 * Protects changes to metaslab groups and classes.
187 * Held as reader by metaslab_free(). SCL_FREE is distinct from
188 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
189 * blocks in zio_done() while another i/o that holds either
190 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
193 * Held as reader to prevent changes to the vdev tree during trivial
194 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
195 * other locks, and lower than all of them, to ensure that it's safe
196 * to acquire regardless of caller context.
198 * In addition, the following rules apply:
200 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
201 * The lock ordering is SCL_CONFIG > spa_props_lock.
203 * (b) I/O operations on leaf vdevs. For any zio operation that takes
204 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
205 * or zio_write_phys() -- the caller must ensure that the config cannot
206 * cannot change in the interim, and that the vdev cannot be reopened.
207 * SCL_STATE as reader suffices for both.
209 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
211 * spa_vdev_enter() Acquire the namespace lock and the config lock
214 * spa_vdev_exit() Release the config lock, wait for all I/O
215 * to complete, sync the updated configs to the
216 * cache, and release the namespace lock.
218 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
219 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
220 * locking is, always, based on spa_namespace_lock and spa_config_lock[].
222 * spa_rename() is also implemented within this file since it requires
223 * manipulation of the namespace.
226 static avl_tree_t spa_namespace_avl
;
227 kmutex_t spa_namespace_lock
;
228 static kcondvar_t spa_namespace_cv
;
229 static int spa_active_count
;
230 int spa_max_replication_override
= SPA_DVAS_PER_BP
;
232 static kmutex_t spa_spare_lock
;
233 static avl_tree_t spa_spare_avl
;
234 static kmutex_t spa_l2cache_lock
;
235 static avl_tree_t spa_l2cache_avl
;
237 kmem_cache_t
*spa_buffer_pool
;
241 /* Everything except dprintf and spa is on by default in debug builds */
242 int zfs_flags
= ~(ZFS_DEBUG_DPRINTF
| ZFS_DEBUG_SPA
);
248 * zfs_recover can be set to nonzero to attempt to recover from
249 * otherwise-fatal errors, typically caused by on-disk corruption. When
250 * set, calls to zfs_panic_recover() will turn into warning messages.
251 * This should only be used as a last resort, as it typically results
252 * in leaked space, or worse.
254 boolean_t zfs_recover
= B_FALSE
;
257 * If destroy encounters an EIO while reading metadata (e.g. indirect
258 * blocks), space referenced by the missing metadata can not be freed.
259 * Normally this causes the background destroy to become "stalled", as
260 * it is unable to make forward progress. While in this stalled state,
261 * all remaining space to free from the error-encountering filesystem is
262 * "temporarily leaked". Set this flag to cause it to ignore the EIO,
263 * permanently leak the space from indirect blocks that can not be read,
264 * and continue to free everything else that it can.
266 * The default, "stalling" behavior is useful if the storage partially
267 * fails (i.e. some but not all i/os fail), and then later recovers. In
268 * this case, we will be able to continue pool operations while it is
269 * partially failed, and when it recovers, we can continue to free the
270 * space, with no leaks. However, note that this case is actually
273 * Typically pools either (a) fail completely (but perhaps temporarily,
274 * e.g. a top-level vdev going offline), or (b) have localized,
275 * permanent errors (e.g. disk returns the wrong data due to bit flip or
276 * firmware bug). In case (a), this setting does not matter because the
277 * pool will be suspended and the sync thread will not be able to make
278 * forward progress regardless. In case (b), because the error is
279 * permanent, the best we can do is leak the minimum amount of space,
280 * which is what setting this flag will do. Therefore, it is reasonable
281 * for this flag to normally be set, but we chose the more conservative
282 * approach of not setting it, so that there is no possibility of
283 * leaking space in the "partial temporary" failure case.
285 boolean_t zfs_free_leak_on_eio
= B_FALSE
;
288 * Expiration time in milliseconds. This value has two meanings. First it is
289 * used to determine when the spa_deadman() logic should fire. By default the
290 * spa_deadman() will fire if spa_sync() has not completed in 1000 seconds.
291 * Secondly, the value determines if an I/O is considered "hung". Any I/O that
292 * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting
295 uint64_t zfs_deadman_synctime_ms
= 1000000ULL;
298 * Check time in milliseconds. This defines the frequency at which we check
301 uint64_t zfs_deadman_checktime_ms
= 5000ULL;
304 * Override the zfs deadman behavior via /etc/system. By default the
305 * deadman is enabled except on VMware and sparc deployments.
307 int zfs_deadman_enabled
= -1;
310 * The worst case is single-sector max-parity RAID-Z blocks, in which
311 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
312 * times the size; so just assume that. Add to this the fact that
313 * we can have up to 3 DVAs per bp, and one more factor of 2 because
314 * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together,
316 * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
318 int spa_asize_inflation
= 24;
321 * Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in
322 * the pool to be consumed. This ensures that we don't run the pool
323 * completely out of space, due to unaccounted changes (e.g. to the MOS).
324 * It also limits the worst-case time to allocate space. If we have
325 * less than this amount of free space, most ZPL operations (e.g. write,
326 * create) will return ENOSPC.
328 * Certain operations (e.g. file removal, most administrative actions) can
329 * use half the slop space. They will only return ENOSPC if less than half
330 * the slop space is free. Typically, once the pool has less than the slop
331 * space free, the user will use these operations to free up space in the pool.
332 * These are the operations that call dsl_pool_adjustedsize() with the netfree
333 * argument set to TRUE.
335 * A very restricted set of operations are always permitted, regardless of
336 * the amount of free space. These are the operations that call
337 * dsl_sync_task(ZFS_SPACE_CHECK_NONE), e.g. "zfs destroy". If these
338 * operations result in a net increase in the amount of space used,
339 * it is possible to run the pool completely out of space, causing it to
340 * be permanently read-only.
342 * See also the comments in zfs_space_check_t.
344 int spa_slop_shift
= 5;
347 * ==========================================================================
349 * ==========================================================================
352 spa_config_lock_init(spa_t
*spa
)
354 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
355 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
356 mutex_init(&scl
->scl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
357 cv_init(&scl
->scl_cv
, NULL
, CV_DEFAULT
, NULL
);
358 refcount_create_untracked(&scl
->scl_count
);
359 scl
->scl_writer
= NULL
;
360 scl
->scl_write_wanted
= 0;
365 spa_config_lock_destroy(spa_t
*spa
)
367 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
368 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
369 mutex_destroy(&scl
->scl_lock
);
370 cv_destroy(&scl
->scl_cv
);
371 refcount_destroy(&scl
->scl_count
);
372 ASSERT(scl
->scl_writer
== NULL
);
373 ASSERT(scl
->scl_write_wanted
== 0);
378 spa_config_tryenter(spa_t
*spa
, int locks
, void *tag
, krw_t rw
)
380 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
381 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
382 if (!(locks
& (1 << i
)))
384 mutex_enter(&scl
->scl_lock
);
385 if (rw
== RW_READER
) {
386 if (scl
->scl_writer
|| scl
->scl_write_wanted
) {
387 mutex_exit(&scl
->scl_lock
);
388 spa_config_exit(spa
, locks
^ (1 << i
), tag
);
392 ASSERT(scl
->scl_writer
!= curthread
);
393 if (!refcount_is_zero(&scl
->scl_count
)) {
394 mutex_exit(&scl
->scl_lock
);
395 spa_config_exit(spa
, locks
^ (1 << i
), tag
);
398 scl
->scl_writer
= curthread
;
400 (void) refcount_add(&scl
->scl_count
, tag
);
401 mutex_exit(&scl
->scl_lock
);
407 spa_config_enter(spa_t
*spa
, int locks
, void *tag
, krw_t rw
)
411 ASSERT3U(SCL_LOCKS
, <, sizeof (wlocks_held
) * NBBY
);
413 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
414 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
415 if (scl
->scl_writer
== curthread
)
416 wlocks_held
|= (1 << i
);
417 if (!(locks
& (1 << i
)))
419 mutex_enter(&scl
->scl_lock
);
420 if (rw
== RW_READER
) {
421 while (scl
->scl_writer
|| scl
->scl_write_wanted
) {
422 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
425 ASSERT(scl
->scl_writer
!= curthread
);
426 while (!refcount_is_zero(&scl
->scl_count
)) {
427 scl
->scl_write_wanted
++;
428 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
429 scl
->scl_write_wanted
--;
431 scl
->scl_writer
= curthread
;
433 (void) refcount_add(&scl
->scl_count
, tag
);
434 mutex_exit(&scl
->scl_lock
);
436 ASSERT(wlocks_held
<= locks
);
440 spa_config_exit(spa_t
*spa
, int locks
, void *tag
)
442 for (int i
= SCL_LOCKS
- 1; i
>= 0; i
--) {
443 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
444 if (!(locks
& (1 << i
)))
446 mutex_enter(&scl
->scl_lock
);
447 ASSERT(!refcount_is_zero(&scl
->scl_count
));
448 if (refcount_remove(&scl
->scl_count
, tag
) == 0) {
449 ASSERT(scl
->scl_writer
== NULL
||
450 scl
->scl_writer
== curthread
);
451 scl
->scl_writer
= NULL
; /* OK in either case */
452 cv_broadcast(&scl
->scl_cv
);
454 mutex_exit(&scl
->scl_lock
);
459 spa_config_held(spa_t
*spa
, int locks
, krw_t rw
)
463 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
464 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
465 if (!(locks
& (1 << i
)))
467 if ((rw
== RW_READER
&& !refcount_is_zero(&scl
->scl_count
)) ||
468 (rw
== RW_WRITER
&& scl
->scl_writer
== curthread
))
469 locks_held
|= 1 << i
;
476 * ==========================================================================
477 * SPA namespace functions
478 * ==========================================================================
482 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
483 * Returns NULL if no matching spa_t is found.
486 spa_lookup(const char *name
)
488 static spa_t search
; /* spa_t is large; don't allocate on stack */
493 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
495 (void) strlcpy(search
.spa_name
, name
, sizeof (search
.spa_name
));
498 * If it's a full dataset name, figure out the pool name and
501 cp
= strpbrk(search
.spa_name
, "/@#");
505 spa
= avl_find(&spa_namespace_avl
, &search
, &where
);
511 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
512 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues
513 * looking for potentially hung I/Os.
516 spa_deadman(void *arg
)
521 * Disable the deadman timer if the pool is suspended.
523 if (spa_suspended(spa
)) {
524 VERIFY(cyclic_reprogram(spa
->spa_deadman_cycid
, CY_INFINITY
));
528 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
529 (gethrtime() - spa
->spa_sync_starttime
) / NANOSEC
,
530 ++spa
->spa_deadman_calls
);
531 if (zfs_deadman_enabled
)
532 vdev_deadman(spa
->spa_root_vdev
);
536 * Create an uninitialized spa_t with the given name. Requires
537 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
538 * exist by calling spa_lookup() first.
541 spa_add(const char *name
, nvlist_t
*config
, const char *altroot
)
544 spa_config_dirent_t
*dp
;
548 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
550 spa
= kmem_zalloc(sizeof (spa_t
), KM_SLEEP
);
552 mutex_init(&spa
->spa_async_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
553 mutex_init(&spa
->spa_errlist_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
554 mutex_init(&spa
->spa_errlog_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
555 mutex_init(&spa
->spa_evicting_os_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
556 mutex_init(&spa
->spa_history_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
557 mutex_init(&spa
->spa_proc_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
558 mutex_init(&spa
->spa_props_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
559 mutex_init(&spa
->spa_scrub_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
560 mutex_init(&spa
->spa_suspend_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
561 mutex_init(&spa
->spa_vdev_top_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
562 mutex_init(&spa
->spa_iokstat_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
564 cv_init(&spa
->spa_async_cv
, NULL
, CV_DEFAULT
, NULL
);
565 cv_init(&spa
->spa_evicting_os_cv
, NULL
, CV_DEFAULT
, NULL
);
566 cv_init(&spa
->spa_proc_cv
, NULL
, CV_DEFAULT
, NULL
);
567 cv_init(&spa
->spa_scrub_io_cv
, NULL
, CV_DEFAULT
, NULL
);
568 cv_init(&spa
->spa_suspend_cv
, NULL
, CV_DEFAULT
, NULL
);
570 for (int t
= 0; t
< TXG_SIZE
; t
++)
571 bplist_create(&spa
->spa_free_bplist
[t
]);
573 (void) strlcpy(spa
->spa_name
, name
, sizeof (spa
->spa_name
));
574 spa
->spa_state
= POOL_STATE_UNINITIALIZED
;
575 spa
->spa_freeze_txg
= UINT64_MAX
;
576 spa
->spa_final_txg
= UINT64_MAX
;
577 spa
->spa_load_max_txg
= UINT64_MAX
;
579 spa
->spa_proc_state
= SPA_PROC_NONE
;
581 hdlr
.cyh_func
= spa_deadman
;
583 hdlr
.cyh_level
= CY_LOW_LEVEL
;
585 spa
->spa_deadman_synctime
= MSEC2NSEC(zfs_deadman_synctime_ms
);
588 * This determines how often we need to check for hung I/Os after
589 * the cyclic has already fired. Since checking for hung I/Os is
590 * an expensive operation we don't want to check too frequently.
591 * Instead wait for 5 seconds before checking again.
593 when
.cyt_interval
= MSEC2NSEC(zfs_deadman_checktime_ms
);
594 when
.cyt_when
= CY_INFINITY
;
595 mutex_enter(&cpu_lock
);
596 spa
->spa_deadman_cycid
= cyclic_add(&hdlr
, &when
);
597 mutex_exit(&cpu_lock
);
599 refcount_create(&spa
->spa_refcount
);
600 spa_config_lock_init(spa
);
602 avl_add(&spa_namespace_avl
, spa
);
605 * Set the alternate root, if there is one.
608 spa
->spa_root
= spa_strdup(altroot
);
613 * Every pool starts with the default cachefile
615 list_create(&spa
->spa_config_list
, sizeof (spa_config_dirent_t
),
616 offsetof(spa_config_dirent_t
, scd_link
));
618 dp
= kmem_zalloc(sizeof (spa_config_dirent_t
), KM_SLEEP
);
619 dp
->scd_path
= altroot
? NULL
: spa_strdup(spa_config_path
);
620 list_insert_head(&spa
->spa_config_list
, dp
);
622 VERIFY(nvlist_alloc(&spa
->spa_load_info
, NV_UNIQUE_NAME
,
625 if (config
!= NULL
) {
628 if (nvlist_lookup_nvlist(config
, ZPOOL_CONFIG_FEATURES_FOR_READ
,
630 VERIFY(nvlist_dup(features
, &spa
->spa_label_features
,
634 VERIFY(nvlist_dup(config
, &spa
->spa_config
, 0) == 0);
637 if (spa
->spa_label_features
== NULL
) {
638 VERIFY(nvlist_alloc(&spa
->spa_label_features
, NV_UNIQUE_NAME
,
642 spa
->spa_iokstat
= kstat_create("zfs", 0, name
,
643 "disk", KSTAT_TYPE_IO
, 1, 0);
644 if (spa
->spa_iokstat
) {
645 spa
->spa_iokstat
->ks_lock
= &spa
->spa_iokstat_lock
;
646 kstat_install(spa
->spa_iokstat
);
649 spa
->spa_debug
= ((zfs_flags
& ZFS_DEBUG_SPA
) != 0);
651 spa
->spa_min_ashift
= INT_MAX
;
652 spa
->spa_max_ashift
= 0;
655 * As a pool is being created, treat all features as disabled by
656 * setting SPA_FEATURE_DISABLED for all entries in the feature
659 for (int i
= 0; i
< SPA_FEATURES
; i
++) {
660 spa
->spa_feat_refcount_cache
[i
] = SPA_FEATURE_DISABLED
;
667 * Removes a spa_t from the namespace, freeing up any memory used. Requires
668 * spa_namespace_lock. This is called only after the spa_t has been closed and
672 spa_remove(spa_t
*spa
)
674 spa_config_dirent_t
*dp
;
676 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
677 ASSERT(spa
->spa_state
== POOL_STATE_UNINITIALIZED
);
678 ASSERT3U(refcount_count(&spa
->spa_refcount
), ==, 0);
680 nvlist_free(spa
->spa_config_splitting
);
682 avl_remove(&spa_namespace_avl
, spa
);
683 cv_broadcast(&spa_namespace_cv
);
686 spa_strfree(spa
->spa_root
);
690 while ((dp
= list_head(&spa
->spa_config_list
)) != NULL
) {
691 list_remove(&spa
->spa_config_list
, dp
);
692 if (dp
->scd_path
!= NULL
)
693 spa_strfree(dp
->scd_path
);
694 kmem_free(dp
, sizeof (spa_config_dirent_t
));
697 list_destroy(&spa
->spa_config_list
);
699 nvlist_free(spa
->spa_label_features
);
700 nvlist_free(spa
->spa_load_info
);
701 spa_config_set(spa
, NULL
);
703 mutex_enter(&cpu_lock
);
704 if (spa
->spa_deadman_cycid
!= CYCLIC_NONE
)
705 cyclic_remove(spa
->spa_deadman_cycid
);
706 mutex_exit(&cpu_lock
);
707 spa
->spa_deadman_cycid
= CYCLIC_NONE
;
709 refcount_destroy(&spa
->spa_refcount
);
711 spa_config_lock_destroy(spa
);
713 kstat_delete(spa
->spa_iokstat
);
714 spa
->spa_iokstat
= NULL
;
716 for (int t
= 0; t
< TXG_SIZE
; t
++)
717 bplist_destroy(&spa
->spa_free_bplist
[t
]);
719 cv_destroy(&spa
->spa_async_cv
);
720 cv_destroy(&spa
->spa_evicting_os_cv
);
721 cv_destroy(&spa
->spa_proc_cv
);
722 cv_destroy(&spa
->spa_scrub_io_cv
);
723 cv_destroy(&spa
->spa_suspend_cv
);
725 mutex_destroy(&spa
->spa_async_lock
);
726 mutex_destroy(&spa
->spa_errlist_lock
);
727 mutex_destroy(&spa
->spa_errlog_lock
);
728 mutex_destroy(&spa
->spa_evicting_os_lock
);
729 mutex_destroy(&spa
->spa_history_lock
);
730 mutex_destroy(&spa
->spa_proc_lock
);
731 mutex_destroy(&spa
->spa_props_lock
);
732 mutex_destroy(&spa
->spa_scrub_lock
);
733 mutex_destroy(&spa
->spa_suspend_lock
);
734 mutex_destroy(&spa
->spa_vdev_top_lock
);
735 mutex_destroy(&spa
->spa_iokstat_lock
);
737 kmem_free(spa
, sizeof (spa_t
));
741 * Given a pool, return the next pool in the namespace, or NULL if there is
742 * none. If 'prev' is NULL, return the first pool.
745 spa_next(spa_t
*prev
)
747 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
750 return (AVL_NEXT(&spa_namespace_avl
, prev
));
752 return (avl_first(&spa_namespace_avl
));
756 * ==========================================================================
757 * SPA refcount functions
758 * ==========================================================================
762 * Add a reference to the given spa_t. Must have at least one reference, or
763 * have the namespace lock held.
766 spa_open_ref(spa_t
*spa
, void *tag
)
768 ASSERT(refcount_count(&spa
->spa_refcount
) >= spa
->spa_minref
||
769 MUTEX_HELD(&spa_namespace_lock
));
770 (void) refcount_add(&spa
->spa_refcount
, tag
);
774 * Remove a reference to the given spa_t. Must have at least one reference, or
775 * have the namespace lock held.
778 spa_close(spa_t
*spa
, void *tag
)
780 ASSERT(refcount_count(&spa
->spa_refcount
) > spa
->spa_minref
||
781 MUTEX_HELD(&spa_namespace_lock
));
782 (void) refcount_remove(&spa
->spa_refcount
, tag
);
786 * Remove a reference to the given spa_t held by a dsl dir that is
787 * being asynchronously released. Async releases occur from a taskq
788 * performing eviction of dsl datasets and dirs. The namespace lock
789 * isn't held and the hold by the object being evicted may contribute to
790 * spa_minref (e.g. dataset or directory released during pool export),
791 * so the asserts in spa_close() do not apply.
794 spa_async_close(spa_t
*spa
, void *tag
)
796 (void) refcount_remove(&spa
->spa_refcount
, tag
);
800 * Check to see if the spa refcount is zero. Must be called with
801 * spa_namespace_lock held. We really compare against spa_minref, which is the
802 * number of references acquired when opening a pool
805 spa_refcount_zero(spa_t
*spa
)
807 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
809 return (refcount_count(&spa
->spa_refcount
) == spa
->spa_minref
);
813 * ==========================================================================
814 * SPA spare and l2cache tracking
815 * ==========================================================================
819 * Hot spares and cache devices are tracked using the same code below,
820 * for 'auxiliary' devices.
823 typedef struct spa_aux
{
831 spa_aux_compare(const void *a
, const void *b
)
833 const spa_aux_t
*sa
= a
;
834 const spa_aux_t
*sb
= b
;
836 if (sa
->aux_guid
< sb
->aux_guid
)
838 else if (sa
->aux_guid
> sb
->aux_guid
)
845 spa_aux_add(vdev_t
*vd
, avl_tree_t
*avl
)
851 search
.aux_guid
= vd
->vdev_guid
;
852 if ((aux
= avl_find(avl
, &search
, &where
)) != NULL
) {
855 aux
= kmem_zalloc(sizeof (spa_aux_t
), KM_SLEEP
);
856 aux
->aux_guid
= vd
->vdev_guid
;
858 avl_insert(avl
, aux
, where
);
863 spa_aux_remove(vdev_t
*vd
, avl_tree_t
*avl
)
869 search
.aux_guid
= vd
->vdev_guid
;
870 aux
= avl_find(avl
, &search
, &where
);
874 if (--aux
->aux_count
== 0) {
875 avl_remove(avl
, aux
);
876 kmem_free(aux
, sizeof (spa_aux_t
));
877 } else if (aux
->aux_pool
== spa_guid(vd
->vdev_spa
)) {
878 aux
->aux_pool
= 0ULL;
883 spa_aux_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
, avl_tree_t
*avl
)
885 spa_aux_t search
, *found
;
887 search
.aux_guid
= guid
;
888 found
= avl_find(avl
, &search
, NULL
);
892 *pool
= found
->aux_pool
;
899 *refcnt
= found
->aux_count
;
904 return (found
!= NULL
);
908 spa_aux_activate(vdev_t
*vd
, avl_tree_t
*avl
)
910 spa_aux_t search
, *found
;
913 search
.aux_guid
= vd
->vdev_guid
;
914 found
= avl_find(avl
, &search
, &where
);
915 ASSERT(found
!= NULL
);
916 ASSERT(found
->aux_pool
== 0ULL);
918 found
->aux_pool
= spa_guid(vd
->vdev_spa
);
922 * Spares are tracked globally due to the following constraints:
924 * - A spare may be part of multiple pools.
925 * - A spare may be added to a pool even if it's actively in use within
927 * - A spare in use in any pool can only be the source of a replacement if
928 * the target is a spare in the same pool.
930 * We keep track of all spares on the system through the use of a reference
931 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
932 * spare, then we bump the reference count in the AVL tree. In addition, we set
933 * the 'vdev_isspare' member to indicate that the device is a spare (active or
934 * inactive). When a spare is made active (used to replace a device in the
935 * pool), we also keep track of which pool its been made a part of.
937 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
938 * called under the spa_namespace lock as part of vdev reconfiguration. The
939 * separate spare lock exists for the status query path, which does not need to
940 * be completely consistent with respect to other vdev configuration changes.
944 spa_spare_compare(const void *a
, const void *b
)
946 return (spa_aux_compare(a
, b
));
950 spa_spare_add(vdev_t
*vd
)
952 mutex_enter(&spa_spare_lock
);
953 ASSERT(!vd
->vdev_isspare
);
954 spa_aux_add(vd
, &spa_spare_avl
);
955 vd
->vdev_isspare
= B_TRUE
;
956 mutex_exit(&spa_spare_lock
);
960 spa_spare_remove(vdev_t
*vd
)
962 mutex_enter(&spa_spare_lock
);
963 ASSERT(vd
->vdev_isspare
);
964 spa_aux_remove(vd
, &spa_spare_avl
);
965 vd
->vdev_isspare
= B_FALSE
;
966 mutex_exit(&spa_spare_lock
);
970 spa_spare_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
)
974 mutex_enter(&spa_spare_lock
);
975 found
= spa_aux_exists(guid
, pool
, refcnt
, &spa_spare_avl
);
976 mutex_exit(&spa_spare_lock
);
982 spa_spare_activate(vdev_t
*vd
)
984 mutex_enter(&spa_spare_lock
);
985 ASSERT(vd
->vdev_isspare
);
986 spa_aux_activate(vd
, &spa_spare_avl
);
987 mutex_exit(&spa_spare_lock
);
991 * Level 2 ARC devices are tracked globally for the same reasons as spares.
992 * Cache devices currently only support one pool per cache device, and so
993 * for these devices the aux reference count is currently unused beyond 1.
997 spa_l2cache_compare(const void *a
, const void *b
)
999 return (spa_aux_compare(a
, b
));
1003 spa_l2cache_add(vdev_t
*vd
)
1005 mutex_enter(&spa_l2cache_lock
);
1006 ASSERT(!vd
->vdev_isl2cache
);
1007 spa_aux_add(vd
, &spa_l2cache_avl
);
1008 vd
->vdev_isl2cache
= B_TRUE
;
1009 mutex_exit(&spa_l2cache_lock
);
1013 spa_l2cache_remove(vdev_t
*vd
)
1015 mutex_enter(&spa_l2cache_lock
);
1016 ASSERT(vd
->vdev_isl2cache
);
1017 spa_aux_remove(vd
, &spa_l2cache_avl
);
1018 vd
->vdev_isl2cache
= B_FALSE
;
1019 mutex_exit(&spa_l2cache_lock
);
1023 spa_l2cache_exists(uint64_t guid
, uint64_t *pool
)
1027 mutex_enter(&spa_l2cache_lock
);
1028 found
= spa_aux_exists(guid
, pool
, NULL
, &spa_l2cache_avl
);
1029 mutex_exit(&spa_l2cache_lock
);
1035 spa_l2cache_activate(vdev_t
*vd
)
1037 mutex_enter(&spa_l2cache_lock
);
1038 ASSERT(vd
->vdev_isl2cache
);
1039 spa_aux_activate(vd
, &spa_l2cache_avl
);
1040 mutex_exit(&spa_l2cache_lock
);
1044 * ==========================================================================
1046 * ==========================================================================
1050 * Lock the given spa_t for the purpose of adding or removing a vdev.
1051 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
1052 * It returns the next transaction group for the spa_t.
1055 spa_vdev_enter(spa_t
*spa
)
1057 mutex_enter(&spa
->spa_vdev_top_lock
);
1058 mutex_enter(&spa_namespace_lock
);
1059 return (spa_vdev_config_enter(spa
));
1063 * Internal implementation for spa_vdev_enter(). Used when a vdev
1064 * operation requires multiple syncs (i.e. removing a device) while
1065 * keeping the spa_namespace_lock held.
1068 spa_vdev_config_enter(spa_t
*spa
)
1070 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1072 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1074 return (spa_last_synced_txg(spa
) + 1);
1078 * Used in combination with spa_vdev_config_enter() to allow the syncing
1079 * of multiple transactions without releasing the spa_namespace_lock.
1082 spa_vdev_config_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
, char *tag
)
1084 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1086 int config_changed
= B_FALSE
;
1088 ASSERT(txg
> spa_last_synced_txg(spa
));
1090 spa
->spa_pending_vdev
= NULL
;
1093 * Reassess the DTLs.
1095 vdev_dtl_reassess(spa
->spa_root_vdev
, 0, 0, B_FALSE
);
1097 if (error
== 0 && !list_is_empty(&spa
->spa_config_dirty_list
)) {
1098 config_changed
= B_TRUE
;
1099 spa
->spa_config_generation
++;
1103 * Verify the metaslab classes.
1105 ASSERT(metaslab_class_validate(spa_normal_class(spa
)) == 0);
1106 ASSERT(metaslab_class_validate(spa_log_class(spa
)) == 0);
1108 spa_config_exit(spa
, SCL_ALL
, spa
);
1111 * Panic the system if the specified tag requires it. This
1112 * is useful for ensuring that configurations are updated
1115 if (zio_injection_enabled
)
1116 zio_handle_panic_injection(spa
, tag
, 0);
1119 * Note: this txg_wait_synced() is important because it ensures
1120 * that there won't be more than one config change per txg.
1121 * This allows us to use the txg as the generation number.
1124 txg_wait_synced(spa
->spa_dsl_pool
, txg
);
1127 ASSERT(!vd
->vdev_detached
|| vd
->vdev_dtl_sm
== NULL
);
1128 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1130 spa_config_exit(spa
, SCL_ALL
, spa
);
1134 * If the config changed, update the config cache.
1137 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1141 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
1142 * locking of spa_vdev_enter(), we also want make sure the transactions have
1143 * synced to disk, and then update the global configuration cache with the new
1147 spa_vdev_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
)
1149 spa_vdev_config_exit(spa
, vd
, txg
, error
, FTAG
);
1150 mutex_exit(&spa_namespace_lock
);
1151 mutex_exit(&spa
->spa_vdev_top_lock
);
1157 * Lock the given spa_t for the purpose of changing vdev state.
1160 spa_vdev_state_enter(spa_t
*spa
, int oplocks
)
1162 int locks
= SCL_STATE_ALL
| oplocks
;
1165 * Root pools may need to read of the underlying devfs filesystem
1166 * when opening up a vdev. Unfortunately if we're holding the
1167 * SCL_ZIO lock it will result in a deadlock when we try to issue
1168 * the read from the root filesystem. Instead we "prefetch"
1169 * the associated vnodes that we need prior to opening the
1170 * underlying devices and cache them so that we can prevent
1171 * any I/O when we are doing the actual open.
1173 if (spa_is_root(spa
)) {
1174 int low
= locks
& ~(SCL_ZIO
- 1);
1175 int high
= locks
& ~low
;
1177 spa_config_enter(spa
, high
, spa
, RW_WRITER
);
1178 vdev_hold(spa
->spa_root_vdev
);
1179 spa_config_enter(spa
, low
, spa
, RW_WRITER
);
1181 spa_config_enter(spa
, locks
, spa
, RW_WRITER
);
1183 spa
->spa_vdev_locks
= locks
;
1187 spa_vdev_state_exit(spa_t
*spa
, vdev_t
*vd
, int error
)
1189 boolean_t config_changed
= B_FALSE
;
1191 if (vd
!= NULL
|| error
== 0)
1192 vdev_dtl_reassess(vd
? vd
->vdev_top
: spa
->spa_root_vdev
,
1196 vdev_state_dirty(vd
->vdev_top
);
1197 config_changed
= B_TRUE
;
1198 spa
->spa_config_generation
++;
1201 if (spa_is_root(spa
))
1202 vdev_rele(spa
->spa_root_vdev
);
1204 ASSERT3U(spa
->spa_vdev_locks
, >=, SCL_STATE_ALL
);
1205 spa_config_exit(spa
, spa
->spa_vdev_locks
, spa
);
1208 * If anything changed, wait for it to sync. This ensures that,
1209 * from the system administrator's perspective, zpool(1M) commands
1210 * are synchronous. This is important for things like zpool offline:
1211 * when the command completes, you expect no further I/O from ZFS.
1214 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1217 * If the config changed, update the config cache.
1219 if (config_changed
) {
1220 mutex_enter(&spa_namespace_lock
);
1221 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1222 mutex_exit(&spa_namespace_lock
);
1229 * ==========================================================================
1230 * Miscellaneous functions
1231 * ==========================================================================
1235 spa_activate_mos_feature(spa_t
*spa
, const char *feature
, dmu_tx_t
*tx
)
1237 if (!nvlist_exists(spa
->spa_label_features
, feature
)) {
1238 fnvlist_add_boolean(spa
->spa_label_features
, feature
);
1240 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't
1241 * dirty the vdev config because lock SCL_CONFIG is not held.
1242 * Thankfully, in this case we don't need to dirty the config
1243 * because it will be written out anyway when we finish
1244 * creating the pool.
1246 if (tx
->tx_txg
!= TXG_INITIAL
)
1247 vdev_config_dirty(spa
->spa_root_vdev
);
1252 spa_deactivate_mos_feature(spa_t
*spa
, const char *feature
)
1254 if (nvlist_remove_all(spa
->spa_label_features
, feature
) == 0)
1255 vdev_config_dirty(spa
->spa_root_vdev
);
1262 spa_rename(const char *name
, const char *newname
)
1268 * Lookup the spa_t and grab the config lock for writing. We need to
1269 * actually open the pool so that we can sync out the necessary labels.
1270 * It's OK to call spa_open() with the namespace lock held because we
1271 * allow recursive calls for other reasons.
1273 mutex_enter(&spa_namespace_lock
);
1274 if ((err
= spa_open(name
, &spa
, FTAG
)) != 0) {
1275 mutex_exit(&spa_namespace_lock
);
1279 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1281 avl_remove(&spa_namespace_avl
, spa
);
1282 (void) strlcpy(spa
->spa_name
, newname
, sizeof (spa
->spa_name
));
1283 avl_add(&spa_namespace_avl
, spa
);
1286 * Sync all labels to disk with the new names by marking the root vdev
1287 * dirty and waiting for it to sync. It will pick up the new pool name
1290 vdev_config_dirty(spa
->spa_root_vdev
);
1292 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1294 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1297 * Sync the updated config cache.
1299 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1301 spa_close(spa
, FTAG
);
1303 mutex_exit(&spa_namespace_lock
);
1309 * Return the spa_t associated with given pool_guid, if it exists. If
1310 * device_guid is non-zero, determine whether the pool exists *and* contains
1311 * a device with the specified device_guid.
1314 spa_by_guid(uint64_t pool_guid
, uint64_t device_guid
)
1317 avl_tree_t
*t
= &spa_namespace_avl
;
1319 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1321 for (spa
= avl_first(t
); spa
!= NULL
; spa
= AVL_NEXT(t
, spa
)) {
1322 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1324 if (spa
->spa_root_vdev
== NULL
)
1326 if (spa_guid(spa
) == pool_guid
) {
1327 if (device_guid
== 0)
1330 if (vdev_lookup_by_guid(spa
->spa_root_vdev
,
1331 device_guid
) != NULL
)
1335 * Check any devices we may be in the process of adding.
1337 if (spa
->spa_pending_vdev
) {
1338 if (vdev_lookup_by_guid(spa
->spa_pending_vdev
,
1339 device_guid
) != NULL
)
1349 * Determine whether a pool with the given pool_guid exists.
1352 spa_guid_exists(uint64_t pool_guid
, uint64_t device_guid
)
1354 return (spa_by_guid(pool_guid
, device_guid
) != NULL
);
1358 spa_strdup(const char *s
)
1364 new = kmem_alloc(len
+ 1, KM_SLEEP
);
1372 spa_strfree(char *s
)
1374 kmem_free(s
, strlen(s
) + 1);
1378 spa_get_random(uint64_t range
)
1384 (void) random_get_pseudo_bytes((void *)&r
, sizeof (uint64_t));
1390 spa_generate_guid(spa_t
*spa
)
1392 uint64_t guid
= spa_get_random(-1ULL);
1395 while (guid
== 0 || spa_guid_exists(spa_guid(spa
), guid
))
1396 guid
= spa_get_random(-1ULL);
1398 while (guid
== 0 || spa_guid_exists(guid
, 0))
1399 guid
= spa_get_random(-1ULL);
1406 snprintf_blkptr(char *buf
, size_t buflen
, const blkptr_t
*bp
)
1409 char *checksum
= NULL
;
1410 char *compress
= NULL
;
1413 if (BP_GET_TYPE(bp
) & DMU_OT_NEWTYPE
) {
1414 dmu_object_byteswap_t bswap
=
1415 DMU_OT_BYTESWAP(BP_GET_TYPE(bp
));
1416 (void) snprintf(type
, sizeof (type
), "bswap %s %s",
1417 DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) ?
1418 "metadata" : "data",
1419 dmu_ot_byteswap
[bswap
].ob_name
);
1421 (void) strlcpy(type
, dmu_ot
[BP_GET_TYPE(bp
)].ot_name
,
1424 if (!BP_IS_EMBEDDED(bp
)) {
1426 zio_checksum_table
[BP_GET_CHECKSUM(bp
)].ci_name
;
1428 compress
= zio_compress_table
[BP_GET_COMPRESS(bp
)].ci_name
;
1431 SNPRINTF_BLKPTR(snprintf
, ' ', buf
, buflen
, bp
, type
, checksum
,
1436 spa_freeze(spa_t
*spa
)
1438 uint64_t freeze_txg
= 0;
1440 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1441 if (spa
->spa_freeze_txg
== UINT64_MAX
) {
1442 freeze_txg
= spa_last_synced_txg(spa
) + TXG_SIZE
;
1443 spa
->spa_freeze_txg
= freeze_txg
;
1445 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1446 if (freeze_txg
!= 0)
1447 txg_wait_synced(spa_get_dsl(spa
), freeze_txg
);
1451 zfs_panic_recover(const char *fmt
, ...)
1456 vcmn_err(zfs_recover
? CE_WARN
: CE_PANIC
, fmt
, adx
);
1461 * This is a stripped-down version of strtoull, suitable only for converting
1462 * lowercase hexadecimal numbers that don't overflow.
1465 strtonum(const char *str
, char **nptr
)
1471 while ((c
= *str
) != '\0') {
1472 if (c
>= '0' && c
<= '9')
1474 else if (c
>= 'a' && c
<= 'f')
1475 digit
= 10 + c
- 'a';
1486 *nptr
= (char *)str
;
1492 * ==========================================================================
1493 * Accessor functions
1494 * ==========================================================================
1498 spa_shutting_down(spa_t
*spa
)
1500 return (spa
->spa_async_suspended
);
1504 spa_get_dsl(spa_t
*spa
)
1506 return (spa
->spa_dsl_pool
);
1510 spa_is_initializing(spa_t
*spa
)
1512 return (spa
->spa_is_initializing
);
1516 spa_get_rootblkptr(spa_t
*spa
)
1518 return (&spa
->spa_ubsync
.ub_rootbp
);
1522 spa_set_rootblkptr(spa_t
*spa
, const blkptr_t
*bp
)
1524 spa
->spa_uberblock
.ub_rootbp
= *bp
;
1528 spa_altroot(spa_t
*spa
, char *buf
, size_t buflen
)
1530 if (spa
->spa_root
== NULL
)
1533 (void) strncpy(buf
, spa
->spa_root
, buflen
);
1537 spa_sync_pass(spa_t
*spa
)
1539 return (spa
->spa_sync_pass
);
1543 spa_name(spa_t
*spa
)
1545 return (spa
->spa_name
);
1549 spa_guid(spa_t
*spa
)
1551 dsl_pool_t
*dp
= spa_get_dsl(spa
);
1555 * If we fail to parse the config during spa_load(), we can go through
1556 * the error path (which posts an ereport) and end up here with no root
1557 * vdev. We stash the original pool guid in 'spa_config_guid' to handle
1560 if (spa
->spa_root_vdev
== NULL
)
1561 return (spa
->spa_config_guid
);
1563 guid
= spa
->spa_last_synced_guid
!= 0 ?
1564 spa
->spa_last_synced_guid
: spa
->spa_root_vdev
->vdev_guid
;
1567 * Return the most recently synced out guid unless we're
1568 * in syncing context.
1570 if (dp
&& dsl_pool_sync_context(dp
))
1571 return (spa
->spa_root_vdev
->vdev_guid
);
1577 spa_load_guid(spa_t
*spa
)
1580 * This is a GUID that exists solely as a reference for the
1581 * purposes of the arc. It is generated at load time, and
1582 * is never written to persistent storage.
1584 return (spa
->spa_load_guid
);
1588 spa_last_synced_txg(spa_t
*spa
)
1590 return (spa
->spa_ubsync
.ub_txg
);
1594 spa_first_txg(spa_t
*spa
)
1596 return (spa
->spa_first_txg
);
1600 spa_syncing_txg(spa_t
*spa
)
1602 return (spa
->spa_syncing_txg
);
1606 spa_state(spa_t
*spa
)
1608 return (spa
->spa_state
);
1612 spa_load_state(spa_t
*spa
)
1614 return (spa
->spa_load_state
);
1618 spa_freeze_txg(spa_t
*spa
)
1620 return (spa
->spa_freeze_txg
);
1625 spa_get_asize(spa_t
*spa
, uint64_t lsize
)
1627 return (lsize
* spa_asize_inflation
);
1631 * Return the amount of slop space in bytes. It is 1/32 of the pool (3.2%),
1634 * See the comment above spa_slop_shift for details.
1637 spa_get_slop_space(spa_t
*spa
) {
1638 uint64_t space
= spa_get_dspace(spa
);
1639 return (MAX(space
>> spa_slop_shift
, SPA_MINDEVSIZE
>> 1));
1643 spa_get_dspace(spa_t
*spa
)
1645 return (spa
->spa_dspace
);
1649 spa_update_dspace(spa_t
*spa
)
1651 spa
->spa_dspace
= metaslab_class_get_dspace(spa_normal_class(spa
)) +
1652 ddt_get_dedup_dspace(spa
);
1656 * Return the failure mode that has been set to this pool. The default
1657 * behavior will be to block all I/Os when a complete failure occurs.
1660 spa_get_failmode(spa_t
*spa
)
1662 return (spa
->spa_failmode
);
1666 spa_suspended(spa_t
*spa
)
1668 return (spa
->spa_suspended
);
1672 spa_version(spa_t
*spa
)
1674 return (spa
->spa_ubsync
.ub_version
);
1678 spa_deflate(spa_t
*spa
)
1680 return (spa
->spa_deflate
);
1684 spa_normal_class(spa_t
*spa
)
1686 return (spa
->spa_normal_class
);
1690 spa_log_class(spa_t
*spa
)
1692 return (spa
->spa_log_class
);
1696 spa_evicting_os_register(spa_t
*spa
, objset_t
*os
)
1698 mutex_enter(&spa
->spa_evicting_os_lock
);
1699 list_insert_head(&spa
->spa_evicting_os_list
, os
);
1700 mutex_exit(&spa
->spa_evicting_os_lock
);
1704 spa_evicting_os_deregister(spa_t
*spa
, objset_t
*os
)
1706 mutex_enter(&spa
->spa_evicting_os_lock
);
1707 list_remove(&spa
->spa_evicting_os_list
, os
);
1708 cv_broadcast(&spa
->spa_evicting_os_cv
);
1709 mutex_exit(&spa
->spa_evicting_os_lock
);
1713 spa_evicting_os_wait(spa_t
*spa
)
1715 mutex_enter(&spa
->spa_evicting_os_lock
);
1716 while (!list_is_empty(&spa
->spa_evicting_os_list
))
1717 cv_wait(&spa
->spa_evicting_os_cv
, &spa
->spa_evicting_os_lock
);
1718 mutex_exit(&spa
->spa_evicting_os_lock
);
1720 dmu_buf_user_evict_wait();
1724 spa_max_replication(spa_t
*spa
)
1727 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
1728 * handle BPs with more than one DVA allocated. Set our max
1729 * replication level accordingly.
1731 if (spa_version(spa
) < SPA_VERSION_DITTO_BLOCKS
)
1733 return (MIN(SPA_DVAS_PER_BP
, spa_max_replication_override
));
1737 spa_prev_software_version(spa_t
*spa
)
1739 return (spa
->spa_prev_software_version
);
1743 spa_deadman_synctime(spa_t
*spa
)
1745 return (spa
->spa_deadman_synctime
);
1749 dva_get_dsize_sync(spa_t
*spa
, const dva_t
*dva
)
1751 uint64_t asize
= DVA_GET_ASIZE(dva
);
1752 uint64_t dsize
= asize
;
1754 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
1756 if (asize
!= 0 && spa
->spa_deflate
) {
1757 vdev_t
*vd
= vdev_lookup_top(spa
, DVA_GET_VDEV(dva
));
1758 dsize
= (asize
>> SPA_MINBLOCKSHIFT
) * vd
->vdev_deflate_ratio
;
1765 bp_get_dsize_sync(spa_t
*spa
, const blkptr_t
*bp
)
1769 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
1770 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
1776 bp_get_dsize(spa_t
*spa
, const blkptr_t
*bp
)
1780 spa_config_enter(spa
, SCL_VDEV
, FTAG
, RW_READER
);
1782 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
1783 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
1785 spa_config_exit(spa
, SCL_VDEV
, FTAG
);
1791 * ==========================================================================
1792 * Initialization and Termination
1793 * ==========================================================================
1797 spa_name_compare(const void *a1
, const void *a2
)
1799 const spa_t
*s1
= a1
;
1800 const spa_t
*s2
= a2
;
1803 s
= strcmp(s1
->spa_name
, s2
->spa_name
);
1814 return (spa_active_count
);
1826 mutex_init(&spa_namespace_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1827 mutex_init(&spa_spare_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1828 mutex_init(&spa_l2cache_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1829 cv_init(&spa_namespace_cv
, NULL
, CV_DEFAULT
, NULL
);
1831 avl_create(&spa_namespace_avl
, spa_name_compare
, sizeof (spa_t
),
1832 offsetof(spa_t
, spa_avl
));
1834 avl_create(&spa_spare_avl
, spa_spare_compare
, sizeof (spa_aux_t
),
1835 offsetof(spa_aux_t
, aux_avl
));
1837 avl_create(&spa_l2cache_avl
, spa_l2cache_compare
, sizeof (spa_aux_t
),
1838 offsetof(spa_aux_t
, aux_avl
));
1840 spa_mode_global
= mode
;
1845 if (spa_mode_global
!= FREAD
&& dprintf_find_string("watch")) {
1846 arc_procfd
= open("/proc/self/ctl", O_WRONLY
);
1847 if (arc_procfd
== -1) {
1848 perror("could not enable watchpoints: "
1849 "opening /proc/self/ctl failed: ");
1862 vdev_cache_stat_init();
1865 zpool_feature_init();
1877 vdev_cache_stat_fini();
1885 avl_destroy(&spa_namespace_avl
);
1886 avl_destroy(&spa_spare_avl
);
1887 avl_destroy(&spa_l2cache_avl
);
1889 cv_destroy(&spa_namespace_cv
);
1890 mutex_destroy(&spa_namespace_lock
);
1891 mutex_destroy(&spa_spare_lock
);
1892 mutex_destroy(&spa_l2cache_lock
);
1896 * Return whether this pool has slogs. No locking needed.
1897 * It's not a problem if the wrong answer is returned as it's only for
1898 * performance and not correctness
1901 spa_has_slogs(spa_t
*spa
)
1903 return (spa
->spa_log_class
->mc_rotor
!= NULL
);
1907 spa_get_log_state(spa_t
*spa
)
1909 return (spa
->spa_log_state
);
1913 spa_set_log_state(spa_t
*spa
, spa_log_state_t state
)
1915 spa
->spa_log_state
= state
;
1919 spa_is_root(spa_t
*spa
)
1921 return (spa
->spa_is_root
);
1925 spa_writeable(spa_t
*spa
)
1927 return (!!(spa
->spa_mode
& FWRITE
));
1931 * Returns true if there is a pending sync task in any of the current
1932 * syncing txg, the current quiescing txg, or the current open txg.
1935 spa_has_pending_synctask(spa_t
*spa
)
1937 return (!txg_all_lists_empty(&spa
->spa_dsl_pool
->dp_sync_tasks
));
1941 spa_mode(spa_t
*spa
)
1943 return (spa
->spa_mode
);
1947 spa_bootfs(spa_t
*spa
)
1949 return (spa
->spa_bootfs
);
1953 spa_delegation(spa_t
*spa
)
1955 return (spa
->spa_delegation
);
1959 spa_meta_objset(spa_t
*spa
)
1961 return (spa
->spa_meta_objset
);
1965 spa_dedup_checksum(spa_t
*spa
)
1967 return (spa
->spa_dedup_checksum
);
1971 * Reset pool scan stat per scan pass (or reboot).
1974 spa_scan_stat_init(spa_t
*spa
)
1976 /* data not stored on disk */
1977 spa
->spa_scan_pass_start
= gethrestime_sec();
1978 spa
->spa_scan_pass_exam
= 0;
1979 vdev_scan_stat_init(spa
->spa_root_vdev
);
1983 * Get scan stats for zpool status reports
1986 spa_scan_get_stats(spa_t
*spa
, pool_scan_stat_t
*ps
)
1988 dsl_scan_t
*scn
= spa
->spa_dsl_pool
? spa
->spa_dsl_pool
->dp_scan
: NULL
;
1990 if (scn
== NULL
|| scn
->scn_phys
.scn_func
== POOL_SCAN_NONE
)
1991 return (SET_ERROR(ENOENT
));
1992 bzero(ps
, sizeof (pool_scan_stat_t
));
1994 /* data stored on disk */
1995 ps
->pss_func
= scn
->scn_phys
.scn_func
;
1996 ps
->pss_start_time
= scn
->scn_phys
.scn_start_time
;
1997 ps
->pss_end_time
= scn
->scn_phys
.scn_end_time
;
1998 ps
->pss_to_examine
= scn
->scn_phys
.scn_to_examine
;
1999 ps
->pss_examined
= scn
->scn_phys
.scn_examined
;
2000 ps
->pss_to_process
= scn
->scn_phys
.scn_to_process
;
2001 ps
->pss_processed
= scn
->scn_phys
.scn_processed
;
2002 ps
->pss_errors
= scn
->scn_phys
.scn_errors
;
2003 ps
->pss_state
= scn
->scn_phys
.scn_state
;
2005 /* data not stored on disk */
2006 ps
->pss_pass_start
= spa
->spa_scan_pass_start
;
2007 ps
->pss_pass_exam
= spa
->spa_scan_pass_exam
;
2013 spa_debug_enabled(spa_t
*spa
)
2015 return (spa
->spa_debug
);
2019 spa_maxblocksize(spa_t
*spa
)
2021 if (spa_feature_is_enabled(spa
, SPA_FEATURE_LARGE_BLOCKS
))
2022 return (SPA_MAXBLOCKSIZE
);
2024 return (SPA_OLD_MAXBLOCKSIZE
);