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, 2017 by Delphix. All rights reserved.
24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
26 * Copyright 2013 Saso Kiselkov. All rights reserved.
27 * Copyright (c) 2014 Integros [integros.com]
28 * Copyright (c) 2017 Datto Inc.
31 #include <sys/zfs_context.h>
32 #include <sys/spa_impl.h>
33 #include <sys/spa_boot.h>
35 #include <sys/zio_checksum.h>
36 #include <sys/zio_compress.h>
38 #include <sys/dmu_tx.h>
41 #include <sys/vdev_impl.h>
42 #include <sys/metaslab.h>
43 #include <sys/uberblock_impl.h>
46 #include <sys/unique.h>
47 #include <sys/dsl_pool.h>
48 #include <sys/dsl_dir.h>
49 #include <sys/dsl_prop.h>
50 #include <sys/dsl_scan.h>
51 #include <sys/fs/zfs.h>
52 #include <sys/metaslab_impl.h>
56 #include <sys/zfeature.h>
61 * There are four basic locks for managing spa_t structures:
63 * spa_namespace_lock (global mutex)
65 * This lock must be acquired to do any of the following:
67 * - Lookup a spa_t by name
68 * - Add or remove a spa_t from the namespace
69 * - Increase spa_refcount from non-zero
70 * - Check if spa_refcount is zero
72 * - add/remove/attach/detach devices
73 * - Held for the duration of create/destroy/import/export
75 * It does not need to handle recursion. A create or destroy may
76 * reference objects (files or zvols) in other pools, but by
77 * definition they must have an existing reference, and will never need
78 * to lookup a spa_t by name.
80 * spa_refcount (per-spa refcount_t protected by mutex)
82 * This reference count keep track of any active users of the spa_t. The
83 * spa_t cannot be destroyed or freed while this is non-zero. Internally,
84 * the refcount is never really 'zero' - opening a pool implicitly keeps
85 * some references in the DMU. Internally we check against spa_minref, but
86 * present the image of a zero/non-zero value to consumers.
88 * spa_config_lock[] (per-spa array of rwlocks)
90 * This protects the spa_t from config changes, and must be held in
91 * the following circumstances:
93 * - RW_READER to perform I/O to the spa
94 * - RW_WRITER to change the vdev config
96 * The locking order is fairly straightforward:
98 * spa_namespace_lock -> spa_refcount
100 * The namespace lock must be acquired to increase the refcount from 0
101 * or to check if it is zero.
103 * spa_refcount -> spa_config_lock[]
105 * There must be at least one valid reference on the spa_t to acquire
108 * spa_namespace_lock -> spa_config_lock[]
110 * The namespace lock must always be taken before the config lock.
113 * The spa_namespace_lock can be acquired directly and is globally visible.
115 * The namespace is manipulated using the following functions, all of which
116 * require the spa_namespace_lock to be held.
118 * spa_lookup() Lookup a spa_t by name.
120 * spa_add() Create a new spa_t in the namespace.
122 * spa_remove() Remove a spa_t from the namespace. This also
123 * frees up any memory associated with the spa_t.
125 * spa_next() Returns the next spa_t in the system, or the
126 * first if NULL is passed.
128 * spa_evict_all() Shutdown and remove all spa_t structures in
131 * spa_guid_exists() Determine whether a pool/device guid exists.
133 * The spa_refcount is manipulated using the following functions:
135 * spa_open_ref() Adds a reference to the given spa_t. Must be
136 * called with spa_namespace_lock held if the
137 * refcount is currently zero.
139 * spa_close() Remove a reference from the spa_t. This will
140 * not free the spa_t or remove it from the
141 * namespace. No locking is required.
143 * spa_refcount_zero() Returns true if the refcount is currently
144 * zero. Must be called with spa_namespace_lock
147 * The spa_config_lock[] is an array of rwlocks, ordered as follows:
148 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
149 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
151 * To read the configuration, it suffices to hold one of these locks as reader.
152 * To modify the configuration, you must hold all locks as writer. To modify
153 * vdev state without altering the vdev tree's topology (e.g. online/offline),
154 * you must hold SCL_STATE and SCL_ZIO as writer.
156 * We use these distinct config locks to avoid recursive lock entry.
157 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
158 * block allocations (SCL_ALLOC), which may require reading space maps
159 * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
161 * The spa config locks cannot be normal rwlocks because we need the
162 * ability to hand off ownership. For example, SCL_ZIO is acquired
163 * by the issuing thread and later released by an interrupt thread.
164 * They do, however, obey the usual write-wanted semantics to prevent
165 * writer (i.e. system administrator) starvation.
167 * The lock acquisition rules are as follows:
170 * Protects changes to the vdev tree topology, such as vdev
171 * add/remove/attach/detach. Protects the dirty config list
172 * (spa_config_dirty_list) and the set of spares and l2arc devices.
175 * Protects changes to pool state and vdev state, such as vdev
176 * online/offline/fault/degrade/clear. Protects the dirty state list
177 * (spa_state_dirty_list) and global pool state (spa_state).
180 * Protects changes to metaslab groups and classes.
181 * Held as reader by metaslab_alloc() and metaslab_claim().
184 * Held by bp-level zios (those which have no io_vd upon entry)
185 * to prevent changes to the vdev tree. The bp-level zio implicitly
186 * protects all of its vdev child zios, which do not hold SCL_ZIO.
189 * Protects changes to metaslab groups and classes.
190 * Held as reader by metaslab_free(). SCL_FREE is distinct from
191 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
192 * blocks in zio_done() while another i/o that holds either
193 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
196 * Held as reader to prevent changes to the vdev tree during trivial
197 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
198 * other locks, and lower than all of them, to ensure that it's safe
199 * to acquire regardless of caller context.
201 * In addition, the following rules apply:
203 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
204 * The lock ordering is SCL_CONFIG > spa_props_lock.
206 * (b) I/O operations on leaf vdevs. For any zio operation that takes
207 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
208 * or zio_write_phys() -- the caller must ensure that the config cannot
209 * cannot change in the interim, and that the vdev cannot be reopened.
210 * SCL_STATE as reader suffices for both.
212 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
214 * spa_vdev_enter() Acquire the namespace lock and the config lock
217 * spa_vdev_exit() Release the config lock, wait for all I/O
218 * to complete, sync the updated configs to the
219 * cache, and release the namespace lock.
221 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
222 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
223 * locking is, always, based on spa_namespace_lock and spa_config_lock[].
225 * spa_rename() is also implemented within this file since it requires
226 * manipulation of the namespace.
229 static avl_tree_t spa_namespace_avl
;
230 kmutex_t spa_namespace_lock
;
231 static kcondvar_t spa_namespace_cv
;
232 static int spa_active_count
;
233 int spa_max_replication_override
= SPA_DVAS_PER_BP
;
235 static kmutex_t spa_spare_lock
;
236 static avl_tree_t spa_spare_avl
;
237 static kmutex_t spa_l2cache_lock
;
238 static avl_tree_t spa_l2cache_avl
;
240 kmem_cache_t
*spa_buffer_pool
;
244 /* Everything except dprintf and spa is on by default in debug builds */
245 int zfs_flags
= ~(ZFS_DEBUG_DPRINTF
| ZFS_DEBUG_SPA
);
251 * zfs_recover can be set to nonzero to attempt to recover from
252 * otherwise-fatal errors, typically caused by on-disk corruption. When
253 * set, calls to zfs_panic_recover() will turn into warning messages.
254 * This should only be used as a last resort, as it typically results
255 * in leaked space, or worse.
257 boolean_t zfs_recover
= B_FALSE
;
260 * If destroy encounters an EIO while reading metadata (e.g. indirect
261 * blocks), space referenced by the missing metadata can not be freed.
262 * Normally this causes the background destroy to become "stalled", as
263 * it is unable to make forward progress. While in this stalled state,
264 * all remaining space to free from the error-encountering filesystem is
265 * "temporarily leaked". Set this flag to cause it to ignore the EIO,
266 * permanently leak the space from indirect blocks that can not be read,
267 * and continue to free everything else that it can.
269 * The default, "stalling" behavior is useful if the storage partially
270 * fails (i.e. some but not all i/os fail), and then later recovers. In
271 * this case, we will be able to continue pool operations while it is
272 * partially failed, and when it recovers, we can continue to free the
273 * space, with no leaks. However, note that this case is actually
276 * Typically pools either (a) fail completely (but perhaps temporarily,
277 * e.g. a top-level vdev going offline), or (b) have localized,
278 * permanent errors (e.g. disk returns the wrong data due to bit flip or
279 * firmware bug). In case (a), this setting does not matter because the
280 * pool will be suspended and the sync thread will not be able to make
281 * forward progress regardless. In case (b), because the error is
282 * permanent, the best we can do is leak the minimum amount of space,
283 * which is what setting this flag will do. Therefore, it is reasonable
284 * for this flag to normally be set, but we chose the more conservative
285 * approach of not setting it, so that there is no possibility of
286 * leaking space in the "partial temporary" failure case.
288 boolean_t zfs_free_leak_on_eio
= B_FALSE
;
291 * Expiration time in milliseconds. This value has two meanings. First it is
292 * used to determine when the spa_deadman() logic should fire. By default the
293 * spa_deadman() will fire if spa_sync() has not completed in 1000 seconds.
294 * Secondly, the value determines if an I/O is considered "hung". Any I/O that
295 * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting
298 uint64_t zfs_deadman_synctime_ms
= 1000000ULL;
301 * Check time in milliseconds. This defines the frequency at which we check
304 uint64_t zfs_deadman_checktime_ms
= 5000ULL;
307 * Override the zfs deadman behavior via /etc/system. By default the
308 * deadman is enabled except on VMware and sparc deployments.
310 int zfs_deadman_enabled
= -1;
313 * The worst case is single-sector max-parity RAID-Z blocks, in which
314 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
315 * times the size; so just assume that. Add to this the fact that
316 * we can have up to 3 DVAs per bp, and one more factor of 2 because
317 * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together,
319 * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
321 int spa_asize_inflation
= 24;
324 * Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in
325 * the pool to be consumed. This ensures that we don't run the pool
326 * completely out of space, due to unaccounted changes (e.g. to the MOS).
327 * It also limits the worst-case time to allocate space. If we have
328 * less than this amount of free space, most ZPL operations (e.g. write,
329 * create) will return ENOSPC.
331 * Certain operations (e.g. file removal, most administrative actions) can
332 * use half the slop space. They will only return ENOSPC if less than half
333 * the slop space is free. Typically, once the pool has less than the slop
334 * space free, the user will use these operations to free up space in the pool.
335 * These are the operations that call dsl_pool_adjustedsize() with the netfree
336 * argument set to TRUE.
338 * A very restricted set of operations are always permitted, regardless of
339 * the amount of free space. These are the operations that call
340 * dsl_sync_task(ZFS_SPACE_CHECK_NONE), e.g. "zfs destroy". If these
341 * operations result in a net increase in the amount of space used,
342 * it is possible to run the pool completely out of space, causing it to
343 * be permanently read-only.
345 * Note that on very small pools, the slop space will be larger than
346 * 3.2%, in an effort to have it be at least spa_min_slop (128MB),
347 * but we never allow it to be more than half the pool size.
349 * See also the comments in zfs_space_check_t.
351 int spa_slop_shift
= 5;
352 uint64_t spa_min_slop
= 128 * 1024 * 1024;
355 * ==========================================================================
357 * ==========================================================================
360 spa_config_lock_init(spa_t
*spa
)
362 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
363 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
364 mutex_init(&scl
->scl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
365 cv_init(&scl
->scl_cv
, NULL
, CV_DEFAULT
, NULL
);
366 refcount_create_untracked(&scl
->scl_count
);
367 scl
->scl_writer
= NULL
;
368 scl
->scl_write_wanted
= 0;
373 spa_config_lock_destroy(spa_t
*spa
)
375 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
376 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
377 mutex_destroy(&scl
->scl_lock
);
378 cv_destroy(&scl
->scl_cv
);
379 refcount_destroy(&scl
->scl_count
);
380 ASSERT(scl
->scl_writer
== NULL
);
381 ASSERT(scl
->scl_write_wanted
== 0);
386 spa_config_tryenter(spa_t
*spa
, int locks
, void *tag
, krw_t rw
)
388 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
389 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
390 if (!(locks
& (1 << i
)))
392 mutex_enter(&scl
->scl_lock
);
393 if (rw
== RW_READER
) {
394 if (scl
->scl_writer
|| scl
->scl_write_wanted
) {
395 mutex_exit(&scl
->scl_lock
);
396 spa_config_exit(spa
, locks
& ((1 << i
) - 1),
401 ASSERT(scl
->scl_writer
!= curthread
);
402 if (!refcount_is_zero(&scl
->scl_count
)) {
403 mutex_exit(&scl
->scl_lock
);
404 spa_config_exit(spa
, locks
& ((1 << i
) - 1),
408 scl
->scl_writer
= curthread
;
410 (void) refcount_add(&scl
->scl_count
, tag
);
411 mutex_exit(&scl
->scl_lock
);
417 spa_config_enter(spa_t
*spa
, int locks
, void *tag
, krw_t rw
)
421 ASSERT3U(SCL_LOCKS
, <, sizeof (wlocks_held
) * NBBY
);
423 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
424 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
425 if (scl
->scl_writer
== curthread
)
426 wlocks_held
|= (1 << i
);
427 if (!(locks
& (1 << i
)))
429 mutex_enter(&scl
->scl_lock
);
430 if (rw
== RW_READER
) {
431 while (scl
->scl_writer
|| scl
->scl_write_wanted
) {
432 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
435 ASSERT(scl
->scl_writer
!= curthread
);
436 while (!refcount_is_zero(&scl
->scl_count
)) {
437 scl
->scl_write_wanted
++;
438 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
439 scl
->scl_write_wanted
--;
441 scl
->scl_writer
= curthread
;
443 (void) refcount_add(&scl
->scl_count
, tag
);
444 mutex_exit(&scl
->scl_lock
);
446 ASSERT(wlocks_held
<= locks
);
450 spa_config_exit(spa_t
*spa
, int locks
, void *tag
)
452 for (int i
= SCL_LOCKS
- 1; i
>= 0; i
--) {
453 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
454 if (!(locks
& (1 << i
)))
456 mutex_enter(&scl
->scl_lock
);
457 ASSERT(!refcount_is_zero(&scl
->scl_count
));
458 if (refcount_remove(&scl
->scl_count
, tag
) == 0) {
459 ASSERT(scl
->scl_writer
== NULL
||
460 scl
->scl_writer
== curthread
);
461 scl
->scl_writer
= NULL
; /* OK in either case */
462 cv_broadcast(&scl
->scl_cv
);
464 mutex_exit(&scl
->scl_lock
);
469 spa_config_held(spa_t
*spa
, int locks
, krw_t rw
)
473 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
474 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
475 if (!(locks
& (1 << i
)))
477 if ((rw
== RW_READER
&& !refcount_is_zero(&scl
->scl_count
)) ||
478 (rw
== RW_WRITER
&& scl
->scl_writer
== curthread
))
479 locks_held
|= 1 << i
;
486 * ==========================================================================
487 * SPA namespace functions
488 * ==========================================================================
492 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
493 * Returns NULL if no matching spa_t is found.
496 spa_lookup(const char *name
)
498 static spa_t search
; /* spa_t is large; don't allocate on stack */
503 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
505 (void) strlcpy(search
.spa_name
, name
, sizeof (search
.spa_name
));
508 * If it's a full dataset name, figure out the pool name and
511 cp
= strpbrk(search
.spa_name
, "/@#");
515 spa
= avl_find(&spa_namespace_avl
, &search
, &where
);
521 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
522 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues
523 * looking for potentially hung I/Os.
526 spa_deadman(void *arg
)
531 * Disable the deadman timer if the pool is suspended.
533 if (spa_suspended(spa
)) {
534 VERIFY(cyclic_reprogram(spa
->spa_deadman_cycid
, CY_INFINITY
));
538 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
539 (gethrtime() - spa
->spa_sync_starttime
) / NANOSEC
,
540 ++spa
->spa_deadman_calls
);
541 if (zfs_deadman_enabled
)
542 vdev_deadman(spa
->spa_root_vdev
);
546 * Create an uninitialized spa_t with the given name. Requires
547 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
548 * exist by calling spa_lookup() first.
551 spa_add(const char *name
, nvlist_t
*config
, const char *altroot
)
554 spa_config_dirent_t
*dp
;
558 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
560 spa
= kmem_zalloc(sizeof (spa_t
), KM_SLEEP
);
562 mutex_init(&spa
->spa_async_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
563 mutex_init(&spa
->spa_errlist_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
564 mutex_init(&spa
->spa_errlog_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
565 mutex_init(&spa
->spa_evicting_os_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
566 mutex_init(&spa
->spa_history_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
567 mutex_init(&spa
->spa_proc_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
568 mutex_init(&spa
->spa_props_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
569 mutex_init(&spa
->spa_cksum_tmpls_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
570 mutex_init(&spa
->spa_scrub_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
571 mutex_init(&spa
->spa_suspend_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
572 mutex_init(&spa
->spa_vdev_top_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
573 mutex_init(&spa
->spa_iokstat_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
574 mutex_init(&spa
->spa_alloc_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
576 cv_init(&spa
->spa_async_cv
, NULL
, CV_DEFAULT
, NULL
);
577 cv_init(&spa
->spa_evicting_os_cv
, NULL
, CV_DEFAULT
, NULL
);
578 cv_init(&spa
->spa_proc_cv
, NULL
, CV_DEFAULT
, NULL
);
579 cv_init(&spa
->spa_scrub_io_cv
, NULL
, CV_DEFAULT
, NULL
);
580 cv_init(&spa
->spa_suspend_cv
, NULL
, CV_DEFAULT
, NULL
);
582 for (int t
= 0; t
< TXG_SIZE
; t
++)
583 bplist_create(&spa
->spa_free_bplist
[t
]);
585 (void) strlcpy(spa
->spa_name
, name
, sizeof (spa
->spa_name
));
586 spa
->spa_state
= POOL_STATE_UNINITIALIZED
;
587 spa
->spa_freeze_txg
= UINT64_MAX
;
588 spa
->spa_final_txg
= UINT64_MAX
;
589 spa
->spa_load_max_txg
= UINT64_MAX
;
591 spa
->spa_proc_state
= SPA_PROC_NONE
;
593 hdlr
.cyh_func
= spa_deadman
;
595 hdlr
.cyh_level
= CY_LOW_LEVEL
;
597 spa
->spa_deadman_synctime
= MSEC2NSEC(zfs_deadman_synctime_ms
);
600 * This determines how often we need to check for hung I/Os after
601 * the cyclic has already fired. Since checking for hung I/Os is
602 * an expensive operation we don't want to check too frequently.
603 * Instead wait for 5 seconds before checking again.
605 when
.cyt_interval
= MSEC2NSEC(zfs_deadman_checktime_ms
);
606 when
.cyt_when
= CY_INFINITY
;
607 mutex_enter(&cpu_lock
);
608 spa
->spa_deadman_cycid
= cyclic_add(&hdlr
, &when
);
609 mutex_exit(&cpu_lock
);
611 refcount_create(&spa
->spa_refcount
);
612 spa_config_lock_init(spa
);
614 avl_add(&spa_namespace_avl
, spa
);
617 * Set the alternate root, if there is one.
620 spa
->spa_root
= spa_strdup(altroot
);
624 avl_create(&spa
->spa_alloc_tree
, zio_bookmark_compare
,
625 sizeof (zio_t
), offsetof(zio_t
, io_alloc_node
));
628 * Every pool starts with the default cachefile
630 list_create(&spa
->spa_config_list
, sizeof (spa_config_dirent_t
),
631 offsetof(spa_config_dirent_t
, scd_link
));
633 dp
= kmem_zalloc(sizeof (spa_config_dirent_t
), KM_SLEEP
);
634 dp
->scd_path
= altroot
? NULL
: spa_strdup(spa_config_path
);
635 list_insert_head(&spa
->spa_config_list
, dp
);
637 VERIFY(nvlist_alloc(&spa
->spa_load_info
, NV_UNIQUE_NAME
,
640 if (config
!= NULL
) {
643 if (nvlist_lookup_nvlist(config
, ZPOOL_CONFIG_FEATURES_FOR_READ
,
645 VERIFY(nvlist_dup(features
, &spa
->spa_label_features
,
649 VERIFY(nvlist_dup(config
, &spa
->spa_config
, 0) == 0);
652 if (spa
->spa_label_features
== NULL
) {
653 VERIFY(nvlist_alloc(&spa
->spa_label_features
, NV_UNIQUE_NAME
,
657 spa
->spa_iokstat
= kstat_create("zfs", 0, name
,
658 "disk", KSTAT_TYPE_IO
, 1, 0);
659 if (spa
->spa_iokstat
) {
660 spa
->spa_iokstat
->ks_lock
= &spa
->spa_iokstat_lock
;
661 kstat_install(spa
->spa_iokstat
);
664 spa
->spa_debug
= ((zfs_flags
& ZFS_DEBUG_SPA
) != 0);
666 spa
->spa_min_ashift
= INT_MAX
;
667 spa
->spa_max_ashift
= 0;
670 * As a pool is being created, treat all features as disabled by
671 * setting SPA_FEATURE_DISABLED for all entries in the feature
674 for (int i
= 0; i
< SPA_FEATURES
; i
++) {
675 spa
->spa_feat_refcount_cache
[i
] = SPA_FEATURE_DISABLED
;
682 * Removes a spa_t from the namespace, freeing up any memory used. Requires
683 * spa_namespace_lock. This is called only after the spa_t has been closed and
687 spa_remove(spa_t
*spa
)
689 spa_config_dirent_t
*dp
;
691 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
692 ASSERT(spa
->spa_state
== POOL_STATE_UNINITIALIZED
);
693 ASSERT3U(refcount_count(&spa
->spa_refcount
), ==, 0);
695 nvlist_free(spa
->spa_config_splitting
);
697 avl_remove(&spa_namespace_avl
, spa
);
698 cv_broadcast(&spa_namespace_cv
);
701 spa_strfree(spa
->spa_root
);
705 while ((dp
= list_head(&spa
->spa_config_list
)) != NULL
) {
706 list_remove(&spa
->spa_config_list
, dp
);
707 if (dp
->scd_path
!= NULL
)
708 spa_strfree(dp
->scd_path
);
709 kmem_free(dp
, sizeof (spa_config_dirent_t
));
712 avl_destroy(&spa
->spa_alloc_tree
);
713 list_destroy(&spa
->spa_config_list
);
715 nvlist_free(spa
->spa_label_features
);
716 nvlist_free(spa
->spa_load_info
);
717 spa_config_set(spa
, NULL
);
719 mutex_enter(&cpu_lock
);
720 if (spa
->spa_deadman_cycid
!= CYCLIC_NONE
)
721 cyclic_remove(spa
->spa_deadman_cycid
);
722 mutex_exit(&cpu_lock
);
723 spa
->spa_deadman_cycid
= CYCLIC_NONE
;
725 refcount_destroy(&spa
->spa_refcount
);
727 spa_config_lock_destroy(spa
);
729 kstat_delete(spa
->spa_iokstat
);
730 spa
->spa_iokstat
= NULL
;
732 for (int t
= 0; t
< TXG_SIZE
; t
++)
733 bplist_destroy(&spa
->spa_free_bplist
[t
]);
735 zio_checksum_templates_free(spa
);
737 cv_destroy(&spa
->spa_async_cv
);
738 cv_destroy(&spa
->spa_evicting_os_cv
);
739 cv_destroy(&spa
->spa_proc_cv
);
740 cv_destroy(&spa
->spa_scrub_io_cv
);
741 cv_destroy(&spa
->spa_suspend_cv
);
743 mutex_destroy(&spa
->spa_alloc_lock
);
744 mutex_destroy(&spa
->spa_async_lock
);
745 mutex_destroy(&spa
->spa_errlist_lock
);
746 mutex_destroy(&spa
->spa_errlog_lock
);
747 mutex_destroy(&spa
->spa_evicting_os_lock
);
748 mutex_destroy(&spa
->spa_history_lock
);
749 mutex_destroy(&spa
->spa_proc_lock
);
750 mutex_destroy(&spa
->spa_props_lock
);
751 mutex_destroy(&spa
->spa_cksum_tmpls_lock
);
752 mutex_destroy(&spa
->spa_scrub_lock
);
753 mutex_destroy(&spa
->spa_suspend_lock
);
754 mutex_destroy(&spa
->spa_vdev_top_lock
);
755 mutex_destroy(&spa
->spa_iokstat_lock
);
757 kmem_free(spa
, sizeof (spa_t
));
761 * Given a pool, return the next pool in the namespace, or NULL if there is
762 * none. If 'prev' is NULL, return the first pool.
765 spa_next(spa_t
*prev
)
767 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
770 return (AVL_NEXT(&spa_namespace_avl
, prev
));
772 return (avl_first(&spa_namespace_avl
));
776 * ==========================================================================
777 * SPA refcount functions
778 * ==========================================================================
782 * Add a reference to the given spa_t. Must have at least one reference, or
783 * have the namespace lock held.
786 spa_open_ref(spa_t
*spa
, void *tag
)
788 ASSERT(refcount_count(&spa
->spa_refcount
) >= spa
->spa_minref
||
789 MUTEX_HELD(&spa_namespace_lock
));
790 (void) refcount_add(&spa
->spa_refcount
, tag
);
794 * Remove a reference to the given spa_t. Must have at least one reference, or
795 * have the namespace lock held.
798 spa_close(spa_t
*spa
, void *tag
)
800 ASSERT(refcount_count(&spa
->spa_refcount
) > spa
->spa_minref
||
801 MUTEX_HELD(&spa_namespace_lock
));
802 (void) refcount_remove(&spa
->spa_refcount
, tag
);
806 * Remove a reference to the given spa_t held by a dsl dir that is
807 * being asynchronously released. Async releases occur from a taskq
808 * performing eviction of dsl datasets and dirs. The namespace lock
809 * isn't held and the hold by the object being evicted may contribute to
810 * spa_minref (e.g. dataset or directory released during pool export),
811 * so the asserts in spa_close() do not apply.
814 spa_async_close(spa_t
*spa
, void *tag
)
816 (void) refcount_remove(&spa
->spa_refcount
, tag
);
820 * Check to see if the spa refcount is zero. Must be called with
821 * spa_namespace_lock held. We really compare against spa_minref, which is the
822 * number of references acquired when opening a pool
825 spa_refcount_zero(spa_t
*spa
)
827 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
829 return (refcount_count(&spa
->spa_refcount
) == spa
->spa_minref
);
833 * ==========================================================================
834 * SPA spare and l2cache tracking
835 * ==========================================================================
839 * Hot spares and cache devices are tracked using the same code below,
840 * for 'auxiliary' devices.
843 typedef struct spa_aux
{
851 spa_aux_compare(const void *a
, const void *b
)
853 const spa_aux_t
*sa
= a
;
854 const spa_aux_t
*sb
= b
;
856 if (sa
->aux_guid
< sb
->aux_guid
)
858 else if (sa
->aux_guid
> sb
->aux_guid
)
865 spa_aux_add(vdev_t
*vd
, avl_tree_t
*avl
)
871 search
.aux_guid
= vd
->vdev_guid
;
872 if ((aux
= avl_find(avl
, &search
, &where
)) != NULL
) {
875 aux
= kmem_zalloc(sizeof (spa_aux_t
), KM_SLEEP
);
876 aux
->aux_guid
= vd
->vdev_guid
;
878 avl_insert(avl
, aux
, where
);
883 spa_aux_remove(vdev_t
*vd
, avl_tree_t
*avl
)
889 search
.aux_guid
= vd
->vdev_guid
;
890 aux
= avl_find(avl
, &search
, &where
);
894 if (--aux
->aux_count
== 0) {
895 avl_remove(avl
, aux
);
896 kmem_free(aux
, sizeof (spa_aux_t
));
897 } else if (aux
->aux_pool
== spa_guid(vd
->vdev_spa
)) {
898 aux
->aux_pool
= 0ULL;
903 spa_aux_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
, avl_tree_t
*avl
)
905 spa_aux_t search
, *found
;
907 search
.aux_guid
= guid
;
908 found
= avl_find(avl
, &search
, NULL
);
912 *pool
= found
->aux_pool
;
919 *refcnt
= found
->aux_count
;
924 return (found
!= NULL
);
928 spa_aux_activate(vdev_t
*vd
, avl_tree_t
*avl
)
930 spa_aux_t search
, *found
;
933 search
.aux_guid
= vd
->vdev_guid
;
934 found
= avl_find(avl
, &search
, &where
);
935 ASSERT(found
!= NULL
);
936 ASSERT(found
->aux_pool
== 0ULL);
938 found
->aux_pool
= spa_guid(vd
->vdev_spa
);
942 * Spares are tracked globally due to the following constraints:
944 * - A spare may be part of multiple pools.
945 * - A spare may be added to a pool even if it's actively in use within
947 * - A spare in use in any pool can only be the source of a replacement if
948 * the target is a spare in the same pool.
950 * We keep track of all spares on the system through the use of a reference
951 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
952 * spare, then we bump the reference count in the AVL tree. In addition, we set
953 * the 'vdev_isspare' member to indicate that the device is a spare (active or
954 * inactive). When a spare is made active (used to replace a device in the
955 * pool), we also keep track of which pool its been made a part of.
957 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
958 * called under the spa_namespace lock as part of vdev reconfiguration. The
959 * separate spare lock exists for the status query path, which does not need to
960 * be completely consistent with respect to other vdev configuration changes.
964 spa_spare_compare(const void *a
, const void *b
)
966 return (spa_aux_compare(a
, b
));
970 spa_spare_add(vdev_t
*vd
)
972 mutex_enter(&spa_spare_lock
);
973 ASSERT(!vd
->vdev_isspare
);
974 spa_aux_add(vd
, &spa_spare_avl
);
975 vd
->vdev_isspare
= B_TRUE
;
976 mutex_exit(&spa_spare_lock
);
980 spa_spare_remove(vdev_t
*vd
)
982 mutex_enter(&spa_spare_lock
);
983 ASSERT(vd
->vdev_isspare
);
984 spa_aux_remove(vd
, &spa_spare_avl
);
985 vd
->vdev_isspare
= B_FALSE
;
986 mutex_exit(&spa_spare_lock
);
990 spa_spare_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
)
994 mutex_enter(&spa_spare_lock
);
995 found
= spa_aux_exists(guid
, pool
, refcnt
, &spa_spare_avl
);
996 mutex_exit(&spa_spare_lock
);
1002 spa_spare_activate(vdev_t
*vd
)
1004 mutex_enter(&spa_spare_lock
);
1005 ASSERT(vd
->vdev_isspare
);
1006 spa_aux_activate(vd
, &spa_spare_avl
);
1007 mutex_exit(&spa_spare_lock
);
1011 * Level 2 ARC devices are tracked globally for the same reasons as spares.
1012 * Cache devices currently only support one pool per cache device, and so
1013 * for these devices the aux reference count is currently unused beyond 1.
1017 spa_l2cache_compare(const void *a
, const void *b
)
1019 return (spa_aux_compare(a
, b
));
1023 spa_l2cache_add(vdev_t
*vd
)
1025 mutex_enter(&spa_l2cache_lock
);
1026 ASSERT(!vd
->vdev_isl2cache
);
1027 spa_aux_add(vd
, &spa_l2cache_avl
);
1028 vd
->vdev_isl2cache
= B_TRUE
;
1029 mutex_exit(&spa_l2cache_lock
);
1033 spa_l2cache_remove(vdev_t
*vd
)
1035 mutex_enter(&spa_l2cache_lock
);
1036 ASSERT(vd
->vdev_isl2cache
);
1037 spa_aux_remove(vd
, &spa_l2cache_avl
);
1038 vd
->vdev_isl2cache
= B_FALSE
;
1039 mutex_exit(&spa_l2cache_lock
);
1043 spa_l2cache_exists(uint64_t guid
, uint64_t *pool
)
1047 mutex_enter(&spa_l2cache_lock
);
1048 found
= spa_aux_exists(guid
, pool
, NULL
, &spa_l2cache_avl
);
1049 mutex_exit(&spa_l2cache_lock
);
1055 spa_l2cache_activate(vdev_t
*vd
)
1057 mutex_enter(&spa_l2cache_lock
);
1058 ASSERT(vd
->vdev_isl2cache
);
1059 spa_aux_activate(vd
, &spa_l2cache_avl
);
1060 mutex_exit(&spa_l2cache_lock
);
1064 * ==========================================================================
1066 * ==========================================================================
1070 * Lock the given spa_t for the purpose of adding or removing a vdev.
1071 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
1072 * It returns the next transaction group for the spa_t.
1075 spa_vdev_enter(spa_t
*spa
)
1077 mutex_enter(&spa
->spa_vdev_top_lock
);
1078 mutex_enter(&spa_namespace_lock
);
1079 return (spa_vdev_config_enter(spa
));
1083 * Internal implementation for spa_vdev_enter(). Used when a vdev
1084 * operation requires multiple syncs (i.e. removing a device) while
1085 * keeping the spa_namespace_lock held.
1088 spa_vdev_config_enter(spa_t
*spa
)
1090 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1092 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1094 return (spa_last_synced_txg(spa
) + 1);
1098 * Used in combination with spa_vdev_config_enter() to allow the syncing
1099 * of multiple transactions without releasing the spa_namespace_lock.
1102 spa_vdev_config_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
, char *tag
)
1104 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1106 int config_changed
= B_FALSE
;
1108 ASSERT(txg
> spa_last_synced_txg(spa
));
1110 spa
->spa_pending_vdev
= NULL
;
1113 * Reassess the DTLs.
1115 vdev_dtl_reassess(spa
->spa_root_vdev
, 0, 0, B_FALSE
);
1117 if (error
== 0 && !list_is_empty(&spa
->spa_config_dirty_list
)) {
1118 config_changed
= B_TRUE
;
1119 spa
->spa_config_generation
++;
1123 * Verify the metaslab classes.
1125 ASSERT(metaslab_class_validate(spa_normal_class(spa
)) == 0);
1126 ASSERT(metaslab_class_validate(spa_log_class(spa
)) == 0);
1128 spa_config_exit(spa
, SCL_ALL
, spa
);
1131 * Panic the system if the specified tag requires it. This
1132 * is useful for ensuring that configurations are updated
1135 if (zio_injection_enabled
)
1136 zio_handle_panic_injection(spa
, tag
, 0);
1139 * Note: this txg_wait_synced() is important because it ensures
1140 * that there won't be more than one config change per txg.
1141 * This allows us to use the txg as the generation number.
1144 txg_wait_synced(spa
->spa_dsl_pool
, txg
);
1147 ASSERT(!vd
->vdev_detached
|| vd
->vdev_dtl_sm
== NULL
);
1148 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1150 spa_config_exit(spa
, SCL_ALL
, spa
);
1154 * If the config changed, update the config cache.
1157 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1161 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
1162 * locking of spa_vdev_enter(), we also want make sure the transactions have
1163 * synced to disk, and then update the global configuration cache with the new
1167 spa_vdev_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
)
1169 spa_vdev_config_exit(spa
, vd
, txg
, error
, FTAG
);
1170 mutex_exit(&spa_namespace_lock
);
1171 mutex_exit(&spa
->spa_vdev_top_lock
);
1177 * Lock the given spa_t for the purpose of changing vdev state.
1180 spa_vdev_state_enter(spa_t
*spa
, int oplocks
)
1182 int locks
= SCL_STATE_ALL
| oplocks
;
1185 * Root pools may need to read of the underlying devfs filesystem
1186 * when opening up a vdev. Unfortunately if we're holding the
1187 * SCL_ZIO lock it will result in a deadlock when we try to issue
1188 * the read from the root filesystem. Instead we "prefetch"
1189 * the associated vnodes that we need prior to opening the
1190 * underlying devices and cache them so that we can prevent
1191 * any I/O when we are doing the actual open.
1193 if (spa_is_root(spa
)) {
1194 int low
= locks
& ~(SCL_ZIO
- 1);
1195 int high
= locks
& ~low
;
1197 spa_config_enter(spa
, high
, spa
, RW_WRITER
);
1198 vdev_hold(spa
->spa_root_vdev
);
1199 spa_config_enter(spa
, low
, spa
, RW_WRITER
);
1201 spa_config_enter(spa
, locks
, spa
, RW_WRITER
);
1203 spa
->spa_vdev_locks
= locks
;
1207 spa_vdev_state_exit(spa_t
*spa
, vdev_t
*vd
, int error
)
1209 boolean_t config_changed
= B_FALSE
;
1211 if (vd
!= NULL
|| error
== 0)
1212 vdev_dtl_reassess(vd
? vd
->vdev_top
: spa
->spa_root_vdev
,
1216 vdev_state_dirty(vd
->vdev_top
);
1217 config_changed
= B_TRUE
;
1218 spa
->spa_config_generation
++;
1221 if (spa_is_root(spa
))
1222 vdev_rele(spa
->spa_root_vdev
);
1224 ASSERT3U(spa
->spa_vdev_locks
, >=, SCL_STATE_ALL
);
1225 spa_config_exit(spa
, spa
->spa_vdev_locks
, spa
);
1228 * If anything changed, wait for it to sync. This ensures that,
1229 * from the system administrator's perspective, zpool(8) commands
1230 * are synchronous. This is important for things like zpool offline:
1231 * when the command completes, you expect no further I/O from ZFS.
1234 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1237 * If the config changed, update the config cache.
1239 if (config_changed
) {
1240 mutex_enter(&spa_namespace_lock
);
1241 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1242 mutex_exit(&spa_namespace_lock
);
1249 * ==========================================================================
1250 * Miscellaneous functions
1251 * ==========================================================================
1255 spa_activate_mos_feature(spa_t
*spa
, const char *feature
, dmu_tx_t
*tx
)
1257 if (!nvlist_exists(spa
->spa_label_features
, feature
)) {
1258 fnvlist_add_boolean(spa
->spa_label_features
, feature
);
1260 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't
1261 * dirty the vdev config because lock SCL_CONFIG is not held.
1262 * Thankfully, in this case we don't need to dirty the config
1263 * because it will be written out anyway when we finish
1264 * creating the pool.
1266 if (tx
->tx_txg
!= TXG_INITIAL
)
1267 vdev_config_dirty(spa
->spa_root_vdev
);
1272 spa_deactivate_mos_feature(spa_t
*spa
, const char *feature
)
1274 if (nvlist_remove_all(spa
->spa_label_features
, feature
) == 0)
1275 vdev_config_dirty(spa
->spa_root_vdev
);
1282 spa_rename(const char *name
, const char *newname
)
1288 * Lookup the spa_t and grab the config lock for writing. We need to
1289 * actually open the pool so that we can sync out the necessary labels.
1290 * It's OK to call spa_open() with the namespace lock held because we
1291 * allow recursive calls for other reasons.
1293 mutex_enter(&spa_namespace_lock
);
1294 if ((err
= spa_open(name
, &spa
, FTAG
)) != 0) {
1295 mutex_exit(&spa_namespace_lock
);
1299 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1301 avl_remove(&spa_namespace_avl
, spa
);
1302 (void) strlcpy(spa
->spa_name
, newname
, sizeof (spa
->spa_name
));
1303 avl_add(&spa_namespace_avl
, spa
);
1306 * Sync all labels to disk with the new names by marking the root vdev
1307 * dirty and waiting for it to sync. It will pick up the new pool name
1310 vdev_config_dirty(spa
->spa_root_vdev
);
1312 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1314 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1317 * Sync the updated config cache.
1319 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1321 spa_close(spa
, FTAG
);
1323 mutex_exit(&spa_namespace_lock
);
1329 * Return the spa_t associated with given pool_guid, if it exists. If
1330 * device_guid is non-zero, determine whether the pool exists *and* contains
1331 * a device with the specified device_guid.
1334 spa_by_guid(uint64_t pool_guid
, uint64_t device_guid
)
1337 avl_tree_t
*t
= &spa_namespace_avl
;
1339 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1341 for (spa
= avl_first(t
); spa
!= NULL
; spa
= AVL_NEXT(t
, spa
)) {
1342 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1344 if (spa
->spa_root_vdev
== NULL
)
1346 if (spa_guid(spa
) == pool_guid
) {
1347 if (device_guid
== 0)
1350 if (vdev_lookup_by_guid(spa
->spa_root_vdev
,
1351 device_guid
) != NULL
)
1355 * Check any devices we may be in the process of adding.
1357 if (spa
->spa_pending_vdev
) {
1358 if (vdev_lookup_by_guid(spa
->spa_pending_vdev
,
1359 device_guid
) != NULL
)
1369 * Determine whether a pool with the given pool_guid exists.
1372 spa_guid_exists(uint64_t pool_guid
, uint64_t device_guid
)
1374 return (spa_by_guid(pool_guid
, device_guid
) != NULL
);
1378 spa_strdup(const char *s
)
1384 new = kmem_alloc(len
+ 1, KM_SLEEP
);
1392 spa_strfree(char *s
)
1394 kmem_free(s
, strlen(s
) + 1);
1398 spa_get_random(uint64_t range
)
1404 (void) random_get_pseudo_bytes((void *)&r
, sizeof (uint64_t));
1410 spa_generate_guid(spa_t
*spa
)
1412 uint64_t guid
= spa_get_random(-1ULL);
1415 while (guid
== 0 || spa_guid_exists(spa_guid(spa
), guid
))
1416 guid
= spa_get_random(-1ULL);
1418 while (guid
== 0 || spa_guid_exists(guid
, 0))
1419 guid
= spa_get_random(-1ULL);
1426 snprintf_blkptr(char *buf
, size_t buflen
, const blkptr_t
*bp
)
1429 char *checksum
= NULL
;
1430 char *compress
= NULL
;
1433 if (BP_GET_TYPE(bp
) & DMU_OT_NEWTYPE
) {
1434 dmu_object_byteswap_t bswap
=
1435 DMU_OT_BYTESWAP(BP_GET_TYPE(bp
));
1436 (void) snprintf(type
, sizeof (type
), "bswap %s %s",
1437 DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) ?
1438 "metadata" : "data",
1439 dmu_ot_byteswap
[bswap
].ob_name
);
1441 (void) strlcpy(type
, dmu_ot
[BP_GET_TYPE(bp
)].ot_name
,
1444 if (!BP_IS_EMBEDDED(bp
)) {
1446 zio_checksum_table
[BP_GET_CHECKSUM(bp
)].ci_name
;
1448 compress
= zio_compress_table
[BP_GET_COMPRESS(bp
)].ci_name
;
1451 SNPRINTF_BLKPTR(snprintf
, ' ', buf
, buflen
, bp
, type
, checksum
,
1456 spa_freeze(spa_t
*spa
)
1458 uint64_t freeze_txg
= 0;
1460 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1461 if (spa
->spa_freeze_txg
== UINT64_MAX
) {
1462 freeze_txg
= spa_last_synced_txg(spa
) + TXG_SIZE
;
1463 spa
->spa_freeze_txg
= freeze_txg
;
1465 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1466 if (freeze_txg
!= 0)
1467 txg_wait_synced(spa_get_dsl(spa
), freeze_txg
);
1471 zfs_panic_recover(const char *fmt
, ...)
1476 vcmn_err(zfs_recover
? CE_WARN
: CE_PANIC
, fmt
, adx
);
1481 * This is a stripped-down version of strtoull, suitable only for converting
1482 * lowercase hexadecimal numbers that don't overflow.
1485 zfs_strtonum(const char *str
, char **nptr
)
1491 while ((c
= *str
) != '\0') {
1492 if (c
>= '0' && c
<= '9')
1494 else if (c
>= 'a' && c
<= 'f')
1495 digit
= 10 + c
- 'a';
1506 *nptr
= (char *)str
;
1512 * ==========================================================================
1513 * Accessor functions
1514 * ==========================================================================
1518 spa_shutting_down(spa_t
*spa
)
1520 return (spa
->spa_async_suspended
);
1524 spa_get_dsl(spa_t
*spa
)
1526 return (spa
->spa_dsl_pool
);
1530 spa_is_initializing(spa_t
*spa
)
1532 return (spa
->spa_is_initializing
);
1536 spa_get_rootblkptr(spa_t
*spa
)
1538 return (&spa
->spa_ubsync
.ub_rootbp
);
1542 spa_set_rootblkptr(spa_t
*spa
, const blkptr_t
*bp
)
1544 spa
->spa_uberblock
.ub_rootbp
= *bp
;
1548 spa_altroot(spa_t
*spa
, char *buf
, size_t buflen
)
1550 if (spa
->spa_root
== NULL
)
1553 (void) strncpy(buf
, spa
->spa_root
, buflen
);
1557 spa_sync_pass(spa_t
*spa
)
1559 return (spa
->spa_sync_pass
);
1563 spa_name(spa_t
*spa
)
1565 return (spa
->spa_name
);
1569 spa_guid(spa_t
*spa
)
1571 dsl_pool_t
*dp
= spa_get_dsl(spa
);
1575 * If we fail to parse the config during spa_load(), we can go through
1576 * the error path (which posts an ereport) and end up here with no root
1577 * vdev. We stash the original pool guid in 'spa_config_guid' to handle
1580 if (spa
->spa_root_vdev
== NULL
)
1581 return (spa
->spa_config_guid
);
1583 guid
= spa
->spa_last_synced_guid
!= 0 ?
1584 spa
->spa_last_synced_guid
: spa
->spa_root_vdev
->vdev_guid
;
1587 * Return the most recently synced out guid unless we're
1588 * in syncing context.
1590 if (dp
&& dsl_pool_sync_context(dp
))
1591 return (spa
->spa_root_vdev
->vdev_guid
);
1597 spa_load_guid(spa_t
*spa
)
1600 * This is a GUID that exists solely as a reference for the
1601 * purposes of the arc. It is generated at load time, and
1602 * is never written to persistent storage.
1604 return (spa
->spa_load_guid
);
1608 spa_last_synced_txg(spa_t
*spa
)
1610 return (spa
->spa_ubsync
.ub_txg
);
1614 spa_first_txg(spa_t
*spa
)
1616 return (spa
->spa_first_txg
);
1620 spa_syncing_txg(spa_t
*spa
)
1622 return (spa
->spa_syncing_txg
);
1626 * Return the last txg where data can be dirtied. The final txgs
1627 * will be used to just clear out any deferred frees that remain.
1630 spa_final_dirty_txg(spa_t
*spa
)
1632 return (spa
->spa_final_txg
- TXG_DEFER_SIZE
);
1636 spa_state(spa_t
*spa
)
1638 return (spa
->spa_state
);
1642 spa_load_state(spa_t
*spa
)
1644 return (spa
->spa_load_state
);
1648 spa_freeze_txg(spa_t
*spa
)
1650 return (spa
->spa_freeze_txg
);
1655 spa_get_worst_case_asize(spa_t
*spa
, uint64_t lsize
)
1657 return (lsize
* spa_asize_inflation
);
1661 * Return the amount of slop space in bytes. It is 1/32 of the pool (3.2%),
1662 * or at least 128MB, unless that would cause it to be more than half the
1665 * See the comment above spa_slop_shift for details.
1668 spa_get_slop_space(spa_t
*spa
)
1670 uint64_t space
= spa_get_dspace(spa
);
1671 return (MAX(space
>> spa_slop_shift
, MIN(space
>> 1, spa_min_slop
)));
1675 spa_get_dspace(spa_t
*spa
)
1677 return (spa
->spa_dspace
);
1681 spa_update_dspace(spa_t
*spa
)
1683 spa
->spa_dspace
= metaslab_class_get_dspace(spa_normal_class(spa
)) +
1684 ddt_get_dedup_dspace(spa
);
1688 * Return the failure mode that has been set to this pool. The default
1689 * behavior will be to block all I/Os when a complete failure occurs.
1692 spa_get_failmode(spa_t
*spa
)
1694 return (spa
->spa_failmode
);
1698 spa_suspended(spa_t
*spa
)
1700 return (spa
->spa_suspended
);
1704 spa_version(spa_t
*spa
)
1706 return (spa
->spa_ubsync
.ub_version
);
1710 spa_deflate(spa_t
*spa
)
1712 return (spa
->spa_deflate
);
1716 spa_normal_class(spa_t
*spa
)
1718 return (spa
->spa_normal_class
);
1722 spa_log_class(spa_t
*spa
)
1724 return (spa
->spa_log_class
);
1728 spa_evicting_os_register(spa_t
*spa
, objset_t
*os
)
1730 mutex_enter(&spa
->spa_evicting_os_lock
);
1731 list_insert_head(&spa
->spa_evicting_os_list
, os
);
1732 mutex_exit(&spa
->spa_evicting_os_lock
);
1736 spa_evicting_os_deregister(spa_t
*spa
, objset_t
*os
)
1738 mutex_enter(&spa
->spa_evicting_os_lock
);
1739 list_remove(&spa
->spa_evicting_os_list
, os
);
1740 cv_broadcast(&spa
->spa_evicting_os_cv
);
1741 mutex_exit(&spa
->spa_evicting_os_lock
);
1745 spa_evicting_os_wait(spa_t
*spa
)
1747 mutex_enter(&spa
->spa_evicting_os_lock
);
1748 while (!list_is_empty(&spa
->spa_evicting_os_list
))
1749 cv_wait(&spa
->spa_evicting_os_cv
, &spa
->spa_evicting_os_lock
);
1750 mutex_exit(&spa
->spa_evicting_os_lock
);
1752 dmu_buf_user_evict_wait();
1756 spa_max_replication(spa_t
*spa
)
1759 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
1760 * handle BPs with more than one DVA allocated. Set our max
1761 * replication level accordingly.
1763 if (spa_version(spa
) < SPA_VERSION_DITTO_BLOCKS
)
1765 return (MIN(SPA_DVAS_PER_BP
, spa_max_replication_override
));
1769 spa_prev_software_version(spa_t
*spa
)
1771 return (spa
->spa_prev_software_version
);
1775 spa_deadman_synctime(spa_t
*spa
)
1777 return (spa
->spa_deadman_synctime
);
1781 dva_get_dsize_sync(spa_t
*spa
, const dva_t
*dva
)
1783 uint64_t asize
= DVA_GET_ASIZE(dva
);
1784 uint64_t dsize
= asize
;
1786 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
1788 if (asize
!= 0 && spa
->spa_deflate
) {
1789 vdev_t
*vd
= vdev_lookup_top(spa
, DVA_GET_VDEV(dva
));
1790 dsize
= (asize
>> SPA_MINBLOCKSHIFT
) * vd
->vdev_deflate_ratio
;
1797 bp_get_dsize_sync(spa_t
*spa
, const blkptr_t
*bp
)
1801 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
1802 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
1808 bp_get_dsize(spa_t
*spa
, const blkptr_t
*bp
)
1812 spa_config_enter(spa
, SCL_VDEV
, FTAG
, RW_READER
);
1814 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
1815 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
1817 spa_config_exit(spa
, SCL_VDEV
, FTAG
);
1823 * ==========================================================================
1824 * Initialization and Termination
1825 * ==========================================================================
1829 spa_name_compare(const void *a1
, const void *a2
)
1831 const spa_t
*s1
= a1
;
1832 const spa_t
*s2
= a2
;
1835 s
= strcmp(s1
->spa_name
, s2
->spa_name
);
1846 return (spa_active_count
);
1858 mutex_init(&spa_namespace_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1859 mutex_init(&spa_spare_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1860 mutex_init(&spa_l2cache_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1861 cv_init(&spa_namespace_cv
, NULL
, CV_DEFAULT
, NULL
);
1863 avl_create(&spa_namespace_avl
, spa_name_compare
, sizeof (spa_t
),
1864 offsetof(spa_t
, spa_avl
));
1866 avl_create(&spa_spare_avl
, spa_spare_compare
, sizeof (spa_aux_t
),
1867 offsetof(spa_aux_t
, aux_avl
));
1869 avl_create(&spa_l2cache_avl
, spa_l2cache_compare
, sizeof (spa_aux_t
),
1870 offsetof(spa_aux_t
, aux_avl
));
1872 spa_mode_global
= mode
;
1877 if (spa_mode_global
!= FREAD
&& dprintf_find_string("watch")) {
1878 arc_procfd
= open("/proc/self/ctl", O_WRONLY
);
1879 if (arc_procfd
== -1) {
1880 perror("could not enable watchpoints: "
1881 "opening /proc/self/ctl failed: ");
1891 metaslab_alloc_trace_init();
1895 vdev_cache_stat_init();
1898 zpool_feature_init();
1910 vdev_cache_stat_fini();
1914 metaslab_alloc_trace_fini();
1919 avl_destroy(&spa_namespace_avl
);
1920 avl_destroy(&spa_spare_avl
);
1921 avl_destroy(&spa_l2cache_avl
);
1923 cv_destroy(&spa_namespace_cv
);
1924 mutex_destroy(&spa_namespace_lock
);
1925 mutex_destroy(&spa_spare_lock
);
1926 mutex_destroy(&spa_l2cache_lock
);
1930 * Return whether this pool has slogs. No locking needed.
1931 * It's not a problem if the wrong answer is returned as it's only for
1932 * performance and not correctness
1935 spa_has_slogs(spa_t
*spa
)
1937 return (spa
->spa_log_class
->mc_rotor
!= NULL
);
1941 spa_get_log_state(spa_t
*spa
)
1943 return (spa
->spa_log_state
);
1947 spa_set_log_state(spa_t
*spa
, spa_log_state_t state
)
1949 spa
->spa_log_state
= state
;
1953 spa_is_root(spa_t
*spa
)
1955 return (spa
->spa_is_root
);
1959 spa_writeable(spa_t
*spa
)
1961 return (!!(spa
->spa_mode
& FWRITE
));
1965 * Returns true if there is a pending sync task in any of the current
1966 * syncing txg, the current quiescing txg, or the current open txg.
1969 spa_has_pending_synctask(spa_t
*spa
)
1971 return (!txg_all_lists_empty(&spa
->spa_dsl_pool
->dp_sync_tasks
));
1975 spa_mode(spa_t
*spa
)
1977 return (spa
->spa_mode
);
1981 spa_bootfs(spa_t
*spa
)
1983 return (spa
->spa_bootfs
);
1987 spa_delegation(spa_t
*spa
)
1989 return (spa
->spa_delegation
);
1993 spa_meta_objset(spa_t
*spa
)
1995 return (spa
->spa_meta_objset
);
1999 spa_dedup_checksum(spa_t
*spa
)
2001 return (spa
->spa_dedup_checksum
);
2005 * Reset pool scan stat per scan pass (or reboot).
2008 spa_scan_stat_init(spa_t
*spa
)
2010 /* data not stored on disk */
2011 spa
->spa_scan_pass_start
= gethrestime_sec();
2012 if (dsl_scan_is_paused_scrub(spa
->spa_dsl_pool
->dp_scan
))
2013 spa
->spa_scan_pass_scrub_pause
= spa
->spa_scan_pass_start
;
2015 spa
->spa_scan_pass_scrub_pause
= 0;
2016 spa
->spa_scan_pass_scrub_spent_paused
= 0;
2017 spa
->spa_scan_pass_exam
= 0;
2018 vdev_scan_stat_init(spa
->spa_root_vdev
);
2022 * Get scan stats for zpool status reports
2025 spa_scan_get_stats(spa_t
*spa
, pool_scan_stat_t
*ps
)
2027 dsl_scan_t
*scn
= spa
->spa_dsl_pool
? spa
->spa_dsl_pool
->dp_scan
: NULL
;
2029 if (scn
== NULL
|| scn
->scn_phys
.scn_func
== POOL_SCAN_NONE
)
2030 return (SET_ERROR(ENOENT
));
2031 bzero(ps
, sizeof (pool_scan_stat_t
));
2033 /* data stored on disk */
2034 ps
->pss_func
= scn
->scn_phys
.scn_func
;
2035 ps
->pss_start_time
= scn
->scn_phys
.scn_start_time
;
2036 ps
->pss_end_time
= scn
->scn_phys
.scn_end_time
;
2037 ps
->pss_to_examine
= scn
->scn_phys
.scn_to_examine
;
2038 ps
->pss_examined
= scn
->scn_phys
.scn_examined
;
2039 ps
->pss_to_process
= scn
->scn_phys
.scn_to_process
;
2040 ps
->pss_processed
= scn
->scn_phys
.scn_processed
;
2041 ps
->pss_errors
= scn
->scn_phys
.scn_errors
;
2042 ps
->pss_state
= scn
->scn_phys
.scn_state
;
2044 /* data not stored on disk */
2045 ps
->pss_pass_start
= spa
->spa_scan_pass_start
;
2046 ps
->pss_pass_exam
= spa
->spa_scan_pass_exam
;
2047 ps
->pss_pass_scrub_pause
= spa
->spa_scan_pass_scrub_pause
;
2048 ps
->pss_pass_scrub_spent_paused
= spa
->spa_scan_pass_scrub_spent_paused
;
2054 spa_debug_enabled(spa_t
*spa
)
2056 return (spa
->spa_debug
);
2060 spa_maxblocksize(spa_t
*spa
)
2062 if (spa_feature_is_enabled(spa
, SPA_FEATURE_LARGE_BLOCKS
))
2063 return (SPA_MAXBLOCKSIZE
);
2065 return (SPA_OLD_MAXBLOCKSIZE
);