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 https://opensource.org/licenses/CDDL-1.0.
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, 2019 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) 2017 Datto Inc.
28 * Copyright (c) 2017, Intel Corporation.
29 * Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
32 #include <sys/zfs_context.h>
33 #include <sys/zfs_chksum.h>
34 #include <sys/spa_impl.h>
36 #include <sys/zio_checksum.h>
37 #include <sys/zio_compress.h>
39 #include <sys/dmu_tx.h>
42 #include <sys/vdev_impl.h>
43 #include <sys/vdev_initialize.h>
44 #include <sys/vdev_trim.h>
45 #include <sys/vdev_file.h>
46 #include <sys/vdev_raidz.h>
47 #include <sys/metaslab.h>
48 #include <sys/uberblock_impl.h>
51 #include <sys/unique.h>
52 #include <sys/dsl_pool.h>
53 #include <sys/dsl_dir.h>
54 #include <sys/dsl_prop.h>
55 #include <sys/fm/util.h>
56 #include <sys/dsl_scan.h>
57 #include <sys/fs/zfs.h>
58 #include <sys/metaslab_impl.h>
61 #include <sys/kstat.h>
63 #include <sys/btree.h>
64 #include <sys/zfeature.h>
66 #include <sys/zstd/zstd.h>
71 * There are three basic locks for managing spa_t structures:
73 * spa_namespace_lock (global mutex)
75 * This lock must be acquired to do any of the following:
77 * - Lookup a spa_t by name
78 * - Add or remove a spa_t from the namespace
79 * - Increase spa_refcount from non-zero
80 * - Check if spa_refcount is zero
82 * - add/remove/attach/detach devices
83 * - Held for the duration of create/destroy/import/export
85 * It does not need to handle recursion. A create or destroy may
86 * reference objects (files or zvols) in other pools, but by
87 * definition they must have an existing reference, and will never need
88 * to lookup a spa_t by name.
90 * spa_refcount (per-spa zfs_refcount_t protected by mutex)
92 * This reference count keep track of any active users of the spa_t. The
93 * spa_t cannot be destroyed or freed while this is non-zero. Internally,
94 * the refcount is never really 'zero' - opening a pool implicitly keeps
95 * some references in the DMU. Internally we check against spa_minref, but
96 * present the image of a zero/non-zero value to consumers.
98 * spa_config_lock[] (per-spa array of rwlocks)
100 * This protects the spa_t from config changes, and must be held in
101 * the following circumstances:
103 * - RW_READER to perform I/O to the spa
104 * - RW_WRITER to change the vdev config
106 * The locking order is fairly straightforward:
108 * spa_namespace_lock -> spa_refcount
110 * The namespace lock must be acquired to increase the refcount from 0
111 * or to check if it is zero.
113 * spa_refcount -> spa_config_lock[]
115 * There must be at least one valid reference on the spa_t to acquire
118 * spa_namespace_lock -> spa_config_lock[]
120 * The namespace lock must always be taken before the config lock.
123 * The spa_namespace_lock can be acquired directly and is globally visible.
125 * The namespace is manipulated using the following functions, all of which
126 * require the spa_namespace_lock to be held.
128 * spa_lookup() Lookup a spa_t by name.
130 * spa_add() Create a new spa_t in the namespace.
132 * spa_remove() Remove a spa_t from the namespace. This also
133 * frees up any memory associated with the spa_t.
135 * spa_next() Returns the next spa_t in the system, or the
136 * first if NULL is passed.
138 * spa_evict_all() Shutdown and remove all spa_t structures in
141 * spa_guid_exists() Determine whether a pool/device guid exists.
143 * The spa_refcount is manipulated using the following functions:
145 * spa_open_ref() Adds a reference to the given spa_t. Must be
146 * called with spa_namespace_lock held if the
147 * refcount is currently zero.
149 * spa_close() Remove a reference from the spa_t. This will
150 * not free the spa_t or remove it from the
151 * namespace. No locking is required.
153 * spa_refcount_zero() Returns true if the refcount is currently
154 * zero. Must be called with spa_namespace_lock
157 * The spa_config_lock[] is an array of rwlocks, ordered as follows:
158 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
159 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
161 * To read the configuration, it suffices to hold one of these locks as reader.
162 * To modify the configuration, you must hold all locks as writer. To modify
163 * vdev state without altering the vdev tree's topology (e.g. online/offline),
164 * you must hold SCL_STATE and SCL_ZIO as writer.
166 * We use these distinct config locks to avoid recursive lock entry.
167 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
168 * block allocations (SCL_ALLOC), which may require reading space maps
169 * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
171 * The spa config locks cannot be normal rwlocks because we need the
172 * ability to hand off ownership. For example, SCL_ZIO is acquired
173 * by the issuing thread and later released by an interrupt thread.
174 * They do, however, obey the usual write-wanted semantics to prevent
175 * writer (i.e. system administrator) starvation.
177 * The lock acquisition rules are as follows:
180 * Protects changes to the vdev tree topology, such as vdev
181 * add/remove/attach/detach. Protects the dirty config list
182 * (spa_config_dirty_list) and the set of spares and l2arc devices.
185 * Protects changes to pool state and vdev state, such as vdev
186 * online/offline/fault/degrade/clear. Protects the dirty state list
187 * (spa_state_dirty_list) and global pool state (spa_state).
190 * Protects changes to metaslab groups and classes.
191 * Held as reader by metaslab_alloc() and metaslab_claim().
194 * Held by bp-level zios (those which have no io_vd upon entry)
195 * to prevent changes to the vdev tree. The bp-level zio implicitly
196 * protects all of its vdev child zios, which do not hold SCL_ZIO.
199 * Protects changes to metaslab groups and classes.
200 * Held as reader by metaslab_free(). SCL_FREE is distinct from
201 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
202 * blocks in zio_done() while another i/o that holds either
203 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
206 * Held as reader to prevent changes to the vdev tree during trivial
207 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
208 * other locks, and lower than all of them, to ensure that it's safe
209 * to acquire regardless of caller context.
211 * In addition, the following rules apply:
213 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
214 * The lock ordering is SCL_CONFIG > spa_props_lock.
216 * (b) I/O operations on leaf vdevs. For any zio operation that takes
217 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
218 * or zio_write_phys() -- the caller must ensure that the config cannot
219 * cannot change in the interim, and that the vdev cannot be reopened.
220 * SCL_STATE as reader suffices for both.
222 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
224 * spa_vdev_enter() Acquire the namespace lock and the config lock
227 * spa_vdev_exit() Release the config lock, wait for all I/O
228 * to complete, sync the updated configs to the
229 * cache, and release the namespace lock.
231 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
232 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
233 * locking is, always, based on spa_namespace_lock and spa_config_lock[].
236 static avl_tree_t spa_namespace_avl
;
237 kmutex_t spa_namespace_lock
;
238 static kcondvar_t spa_namespace_cv
;
239 static const int spa_max_replication_override
= SPA_DVAS_PER_BP
;
241 static kmutex_t spa_spare_lock
;
242 static avl_tree_t spa_spare_avl
;
243 static kmutex_t spa_l2cache_lock
;
244 static avl_tree_t spa_l2cache_avl
;
246 spa_mode_t spa_mode_global
= SPA_MODE_UNINIT
;
250 * Everything except dprintf, set_error, spa, and indirect_remap is on
251 * by default in debug builds.
253 int zfs_flags
= ~(ZFS_DEBUG_DPRINTF
| ZFS_DEBUG_SET_ERROR
|
254 ZFS_DEBUG_INDIRECT_REMAP
);
260 * zfs_recover can be set to nonzero to attempt to recover from
261 * otherwise-fatal errors, typically caused by on-disk corruption. When
262 * set, calls to zfs_panic_recover() will turn into warning messages.
263 * This should only be used as a last resort, as it typically results
264 * in leaked space, or worse.
266 int zfs_recover
= B_FALSE
;
269 * If destroy encounters an EIO while reading metadata (e.g. indirect
270 * blocks), space referenced by the missing metadata can not be freed.
271 * Normally this causes the background destroy to become "stalled", as
272 * it is unable to make forward progress. While in this stalled state,
273 * all remaining space to free from the error-encountering filesystem is
274 * "temporarily leaked". Set this flag to cause it to ignore the EIO,
275 * permanently leak the space from indirect blocks that can not be read,
276 * and continue to free everything else that it can.
278 * The default, "stalling" behavior is useful if the storage partially
279 * fails (i.e. some but not all i/os fail), and then later recovers. In
280 * this case, we will be able to continue pool operations while it is
281 * partially failed, and when it recovers, we can continue to free the
282 * space, with no leaks. However, note that this case is actually
285 * Typically pools either (a) fail completely (but perhaps temporarily,
286 * e.g. a top-level vdev going offline), or (b) have localized,
287 * permanent errors (e.g. disk returns the wrong data due to bit flip or
288 * firmware bug). In case (a), this setting does not matter because the
289 * pool will be suspended and the sync thread will not be able to make
290 * forward progress regardless. In case (b), because the error is
291 * permanent, the best we can do is leak the minimum amount of space,
292 * which is what setting this flag will do. Therefore, it is reasonable
293 * for this flag to normally be set, but we chose the more conservative
294 * approach of not setting it, so that there is no possibility of
295 * leaking space in the "partial temporary" failure case.
297 int zfs_free_leak_on_eio
= B_FALSE
;
300 * Expiration time in milliseconds. This value has two meanings. First it is
301 * used to determine when the spa_deadman() logic should fire. By default the
302 * spa_deadman() will fire if spa_sync() has not completed in 600 seconds.
303 * Secondly, the value determines if an I/O is considered "hung". Any I/O that
304 * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting
305 * in one of three behaviors controlled by zfs_deadman_failmode.
307 uint64_t zfs_deadman_synctime_ms
= 600000UL; /* 10 min. */
310 * This value controls the maximum amount of time zio_wait() will block for an
311 * outstanding IO. By default this is 300 seconds at which point the "hung"
312 * behavior will be applied as described for zfs_deadman_synctime_ms.
314 uint64_t zfs_deadman_ziotime_ms
= 300000UL; /* 5 min. */
317 * Check time in milliseconds. This defines the frequency at which we check
320 uint64_t zfs_deadman_checktime_ms
= 60000UL; /* 1 min. */
323 * By default the deadman is enabled.
325 int zfs_deadman_enabled
= B_TRUE
;
328 * Controls the behavior of the deadman when it detects a "hung" I/O.
329 * Valid values are zfs_deadman_failmode=<wait|continue|panic>.
331 * wait - Wait for the "hung" I/O (default)
332 * continue - Attempt to recover from a "hung" I/O
333 * panic - Panic the system
335 const char *zfs_deadman_failmode
= "wait";
338 * The worst case is single-sector max-parity RAID-Z blocks, in which
339 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
340 * times the size; so just assume that. Add to this the fact that
341 * we can have up to 3 DVAs per bp, and one more factor of 2 because
342 * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together,
344 * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
346 uint_t spa_asize_inflation
= 24;
349 * Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in
350 * the pool to be consumed (bounded by spa_max_slop). This ensures that we
351 * don't run the pool completely out of space, due to unaccounted changes (e.g.
352 * to the MOS). It also limits the worst-case time to allocate space. If we
353 * have less than this amount of free space, most ZPL operations (e.g. write,
354 * create) will return ENOSPC. The ZIL metaslabs (spa_embedded_log_class) are
355 * also part of this 3.2% of space which can't be consumed by normal writes;
356 * the slop space "proper" (spa_get_slop_space()) is decreased by the embedded
359 * Certain operations (e.g. file removal, most administrative actions) can
360 * use half the slop space. They will only return ENOSPC if less than half
361 * the slop space is free. Typically, once the pool has less than the slop
362 * space free, the user will use these operations to free up space in the pool.
363 * These are the operations that call dsl_pool_adjustedsize() with the netfree
364 * argument set to TRUE.
366 * Operations that are almost guaranteed to free up space in the absence of
367 * a pool checkpoint can use up to three quarters of the slop space
370 * A very restricted set of operations are always permitted, regardless of
371 * the amount of free space. These are the operations that call
372 * dsl_sync_task(ZFS_SPACE_CHECK_NONE). If these operations result in a net
373 * increase in the amount of space used, it is possible to run the pool
374 * completely out of space, causing it to be permanently read-only.
376 * Note that on very small pools, the slop space will be larger than
377 * 3.2%, in an effort to have it be at least spa_min_slop (128MB),
378 * but we never allow it to be more than half the pool size.
380 * Further, on very large pools, the slop space will be smaller than
381 * 3.2%, to avoid reserving much more space than we actually need; bounded
382 * by spa_max_slop (128GB).
384 * See also the comments in zfs_space_check_t.
386 uint_t spa_slop_shift
= 5;
387 static const uint64_t spa_min_slop
= 128ULL * 1024 * 1024;
388 static const uint64_t spa_max_slop
= 128ULL * 1024 * 1024 * 1024;
389 static const int spa_allocators
= 4;
393 spa_load_failed(spa_t
*spa
, const char *fmt
, ...)
399 (void) vsnprintf(buf
, sizeof (buf
), fmt
, adx
);
402 zfs_dbgmsg("spa_load(%s, config %s): FAILED: %s", spa
->spa_name
,
403 spa
->spa_trust_config
? "trusted" : "untrusted", buf
);
407 spa_load_note(spa_t
*spa
, const char *fmt
, ...)
413 (void) vsnprintf(buf
, sizeof (buf
), fmt
, adx
);
416 zfs_dbgmsg("spa_load(%s, config %s): %s", spa
->spa_name
,
417 spa
->spa_trust_config
? "trusted" : "untrusted", buf
);
421 * By default dedup and user data indirects land in the special class
423 static int zfs_ddt_data_is_special
= B_TRUE
;
424 static int zfs_user_indirect_is_special
= B_TRUE
;
427 * The percentage of special class final space reserved for metadata only.
428 * Once we allocate 100 - zfs_special_class_metadata_reserve_pct we only
429 * let metadata into the class.
431 static uint_t zfs_special_class_metadata_reserve_pct
= 25;
434 * ==========================================================================
436 * ==========================================================================
439 spa_config_lock_init(spa_t
*spa
)
441 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
442 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
443 mutex_init(&scl
->scl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
444 cv_init(&scl
->scl_cv
, NULL
, CV_DEFAULT
, NULL
);
445 scl
->scl_writer
= NULL
;
446 scl
->scl_write_wanted
= 0;
452 spa_config_lock_destroy(spa_t
*spa
)
454 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
455 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
456 mutex_destroy(&scl
->scl_lock
);
457 cv_destroy(&scl
->scl_cv
);
458 ASSERT(scl
->scl_writer
== NULL
);
459 ASSERT(scl
->scl_write_wanted
== 0);
460 ASSERT(scl
->scl_count
== 0);
465 spa_config_tryenter(spa_t
*spa
, int locks
, const void *tag
, krw_t rw
)
467 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
468 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
469 if (!(locks
& (1 << i
)))
471 mutex_enter(&scl
->scl_lock
);
472 if (rw
== RW_READER
) {
473 if (scl
->scl_writer
|| scl
->scl_write_wanted
) {
474 mutex_exit(&scl
->scl_lock
);
475 spa_config_exit(spa
, locks
& ((1 << i
) - 1),
480 ASSERT(scl
->scl_writer
!= curthread
);
481 if (scl
->scl_count
!= 0) {
482 mutex_exit(&scl
->scl_lock
);
483 spa_config_exit(spa
, locks
& ((1 << i
) - 1),
487 scl
->scl_writer
= curthread
;
490 mutex_exit(&scl
->scl_lock
);
496 spa_config_enter(spa_t
*spa
, int locks
, const void *tag
, krw_t rw
)
501 ASSERT3U(SCL_LOCKS
, <, sizeof (wlocks_held
) * NBBY
);
503 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
504 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
505 if (scl
->scl_writer
== curthread
)
506 wlocks_held
|= (1 << i
);
507 if (!(locks
& (1 << i
)))
509 mutex_enter(&scl
->scl_lock
);
510 if (rw
== RW_READER
) {
511 while (scl
->scl_writer
|| scl
->scl_write_wanted
) {
512 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
515 ASSERT(scl
->scl_writer
!= curthread
);
516 while (scl
->scl_count
!= 0) {
517 scl
->scl_write_wanted
++;
518 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
519 scl
->scl_write_wanted
--;
521 scl
->scl_writer
= curthread
;
524 mutex_exit(&scl
->scl_lock
);
526 ASSERT3U(wlocks_held
, <=, locks
);
530 spa_config_exit(spa_t
*spa
, int locks
, const void *tag
)
533 for (int i
= SCL_LOCKS
- 1; i
>= 0; i
--) {
534 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
535 if (!(locks
& (1 << i
)))
537 mutex_enter(&scl
->scl_lock
);
538 ASSERT(scl
->scl_count
> 0);
539 if (--scl
->scl_count
== 0) {
540 ASSERT(scl
->scl_writer
== NULL
||
541 scl
->scl_writer
== curthread
);
542 scl
->scl_writer
= NULL
; /* OK in either case */
543 cv_broadcast(&scl
->scl_cv
);
545 mutex_exit(&scl
->scl_lock
);
550 spa_config_held(spa_t
*spa
, int locks
, krw_t rw
)
554 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
555 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
556 if (!(locks
& (1 << i
)))
558 if ((rw
== RW_READER
&& scl
->scl_count
!= 0) ||
559 (rw
== RW_WRITER
&& scl
->scl_writer
== curthread
))
560 locks_held
|= 1 << i
;
567 * ==========================================================================
568 * SPA namespace functions
569 * ==========================================================================
573 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
574 * Returns NULL if no matching spa_t is found.
577 spa_lookup(const char *name
)
579 static spa_t search
; /* spa_t is large; don't allocate on stack */
584 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
586 (void) strlcpy(search
.spa_name
, name
, sizeof (search
.spa_name
));
589 * If it's a full dataset name, figure out the pool name and
592 cp
= strpbrk(search
.spa_name
, "/@#");
596 spa
= avl_find(&spa_namespace_avl
, &search
, &where
);
602 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
603 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues
604 * looking for potentially hung I/Os.
607 spa_deadman(void *arg
)
611 /* Disable the deadman if the pool is suspended. */
612 if (spa_suspended(spa
))
615 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
616 (gethrtime() - spa
->spa_sync_starttime
) / NANOSEC
,
617 (u_longlong_t
)++spa
->spa_deadman_calls
);
618 if (zfs_deadman_enabled
)
619 vdev_deadman(spa
->spa_root_vdev
, FTAG
);
621 spa
->spa_deadman_tqid
= taskq_dispatch_delay(system_delay_taskq
,
622 spa_deadman
, spa
, TQ_SLEEP
, ddi_get_lbolt() +
623 MSEC_TO_TICK(zfs_deadman_checktime_ms
));
627 spa_log_sm_sort_by_txg(const void *va
, const void *vb
)
629 const spa_log_sm_t
*a
= va
;
630 const spa_log_sm_t
*b
= vb
;
632 return (TREE_CMP(a
->sls_txg
, b
->sls_txg
));
636 * Create an uninitialized spa_t with the given name. Requires
637 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
638 * exist by calling spa_lookup() first.
641 spa_add(const char *name
, nvlist_t
*config
, const char *altroot
)
644 spa_config_dirent_t
*dp
;
646 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
648 spa
= kmem_zalloc(sizeof (spa_t
), KM_SLEEP
);
650 mutex_init(&spa
->spa_async_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
651 mutex_init(&spa
->spa_errlist_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
652 mutex_init(&spa
->spa_errlog_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
653 mutex_init(&spa
->spa_evicting_os_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
654 mutex_init(&spa
->spa_history_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
655 mutex_init(&spa
->spa_proc_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
656 mutex_init(&spa
->spa_props_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
657 mutex_init(&spa
->spa_cksum_tmpls_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
658 mutex_init(&spa
->spa_scrub_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
659 mutex_init(&spa
->spa_suspend_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
660 mutex_init(&spa
->spa_vdev_top_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
661 mutex_init(&spa
->spa_feat_stats_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
662 mutex_init(&spa
->spa_flushed_ms_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
663 mutex_init(&spa
->spa_activities_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
665 cv_init(&spa
->spa_async_cv
, NULL
, CV_DEFAULT
, NULL
);
666 cv_init(&spa
->spa_evicting_os_cv
, NULL
, CV_DEFAULT
, NULL
);
667 cv_init(&spa
->spa_proc_cv
, NULL
, CV_DEFAULT
, NULL
);
668 cv_init(&spa
->spa_scrub_io_cv
, NULL
, CV_DEFAULT
, NULL
);
669 cv_init(&spa
->spa_suspend_cv
, NULL
, CV_DEFAULT
, NULL
);
670 cv_init(&spa
->spa_activities_cv
, NULL
, CV_DEFAULT
, NULL
);
671 cv_init(&spa
->spa_waiters_cv
, NULL
, CV_DEFAULT
, NULL
);
673 for (int t
= 0; t
< TXG_SIZE
; t
++)
674 bplist_create(&spa
->spa_free_bplist
[t
]);
676 (void) strlcpy(spa
->spa_name
, name
, sizeof (spa
->spa_name
));
677 spa
->spa_state
= POOL_STATE_UNINITIALIZED
;
678 spa
->spa_freeze_txg
= UINT64_MAX
;
679 spa
->spa_final_txg
= UINT64_MAX
;
680 spa
->spa_load_max_txg
= UINT64_MAX
;
682 spa
->spa_proc_state
= SPA_PROC_NONE
;
683 spa
->spa_trust_config
= B_TRUE
;
684 spa
->spa_hostid
= zone_get_hostid(NULL
);
686 spa
->spa_deadman_synctime
= MSEC2NSEC(zfs_deadman_synctime_ms
);
687 spa
->spa_deadman_ziotime
= MSEC2NSEC(zfs_deadman_ziotime_ms
);
688 spa_set_deadman_failmode(spa
, zfs_deadman_failmode
);
690 zfs_refcount_create(&spa
->spa_refcount
);
691 spa_config_lock_init(spa
);
694 avl_add(&spa_namespace_avl
, spa
);
697 * Set the alternate root, if there is one.
700 spa
->spa_root
= spa_strdup(altroot
);
702 spa
->spa_alloc_count
= spa_allocators
;
703 spa
->spa_allocs
= kmem_zalloc(spa
->spa_alloc_count
*
704 sizeof (spa_alloc_t
), KM_SLEEP
);
705 for (int i
= 0; i
< spa
->spa_alloc_count
; i
++) {
706 mutex_init(&spa
->spa_allocs
[i
].spaa_lock
, NULL
, MUTEX_DEFAULT
,
708 avl_create(&spa
->spa_allocs
[i
].spaa_tree
, zio_bookmark_compare
,
709 sizeof (zio_t
), offsetof(zio_t
, io_alloc_node
));
711 avl_create(&spa
->spa_metaslabs_by_flushed
, metaslab_sort_by_flushed
,
712 sizeof (metaslab_t
), offsetof(metaslab_t
, ms_spa_txg_node
));
713 avl_create(&spa
->spa_sm_logs_by_txg
, spa_log_sm_sort_by_txg
,
714 sizeof (spa_log_sm_t
), offsetof(spa_log_sm_t
, sls_node
));
715 list_create(&spa
->spa_log_summary
, sizeof (log_summary_entry_t
),
716 offsetof(log_summary_entry_t
, lse_node
));
719 * Every pool starts with the default cachefile
721 list_create(&spa
->spa_config_list
, sizeof (spa_config_dirent_t
),
722 offsetof(spa_config_dirent_t
, scd_link
));
724 dp
= kmem_zalloc(sizeof (spa_config_dirent_t
), KM_SLEEP
);
725 dp
->scd_path
= altroot
? NULL
: spa_strdup(spa_config_path
);
726 list_insert_head(&spa
->spa_config_list
, dp
);
728 VERIFY(nvlist_alloc(&spa
->spa_load_info
, NV_UNIQUE_NAME
,
731 if (config
!= NULL
) {
734 if (nvlist_lookup_nvlist(config
, ZPOOL_CONFIG_FEATURES_FOR_READ
,
736 VERIFY(nvlist_dup(features
, &spa
->spa_label_features
,
740 VERIFY(nvlist_dup(config
, &spa
->spa_config
, 0) == 0);
743 if (spa
->spa_label_features
== NULL
) {
744 VERIFY(nvlist_alloc(&spa
->spa_label_features
, NV_UNIQUE_NAME
,
748 spa
->spa_min_ashift
= INT_MAX
;
749 spa
->spa_max_ashift
= 0;
750 spa
->spa_min_alloc
= INT_MAX
;
752 /* Reset cached value */
753 spa
->spa_dedup_dspace
= ~0ULL;
756 * As a pool is being created, treat all features as disabled by
757 * setting SPA_FEATURE_DISABLED for all entries in the feature
760 for (int i
= 0; i
< SPA_FEATURES
; i
++) {
761 spa
->spa_feat_refcount_cache
[i
] = SPA_FEATURE_DISABLED
;
764 list_create(&spa
->spa_leaf_list
, sizeof (vdev_t
),
765 offsetof(vdev_t
, vdev_leaf_node
));
771 * Removes a spa_t from the namespace, freeing up any memory used. Requires
772 * spa_namespace_lock. This is called only after the spa_t has been closed and
776 spa_remove(spa_t
*spa
)
778 spa_config_dirent_t
*dp
;
780 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
781 ASSERT(spa_state(spa
) == POOL_STATE_UNINITIALIZED
);
782 ASSERT3U(zfs_refcount_count(&spa
->spa_refcount
), ==, 0);
783 ASSERT0(spa
->spa_waiters
);
785 nvlist_free(spa
->spa_config_splitting
);
787 avl_remove(&spa_namespace_avl
, spa
);
788 cv_broadcast(&spa_namespace_cv
);
791 spa_strfree(spa
->spa_root
);
793 while ((dp
= list_head(&spa
->spa_config_list
)) != NULL
) {
794 list_remove(&spa
->spa_config_list
, dp
);
795 if (dp
->scd_path
!= NULL
)
796 spa_strfree(dp
->scd_path
);
797 kmem_free(dp
, sizeof (spa_config_dirent_t
));
800 for (int i
= 0; i
< spa
->spa_alloc_count
; i
++) {
801 avl_destroy(&spa
->spa_allocs
[i
].spaa_tree
);
802 mutex_destroy(&spa
->spa_allocs
[i
].spaa_lock
);
804 kmem_free(spa
->spa_allocs
, spa
->spa_alloc_count
*
805 sizeof (spa_alloc_t
));
807 avl_destroy(&spa
->spa_metaslabs_by_flushed
);
808 avl_destroy(&spa
->spa_sm_logs_by_txg
);
809 list_destroy(&spa
->spa_log_summary
);
810 list_destroy(&spa
->spa_config_list
);
811 list_destroy(&spa
->spa_leaf_list
);
813 nvlist_free(spa
->spa_label_features
);
814 nvlist_free(spa
->spa_load_info
);
815 nvlist_free(spa
->spa_feat_stats
);
816 spa_config_set(spa
, NULL
);
818 zfs_refcount_destroy(&spa
->spa_refcount
);
820 spa_stats_destroy(spa
);
821 spa_config_lock_destroy(spa
);
823 for (int t
= 0; t
< TXG_SIZE
; t
++)
824 bplist_destroy(&spa
->spa_free_bplist
[t
]);
826 zio_checksum_templates_free(spa
);
828 cv_destroy(&spa
->spa_async_cv
);
829 cv_destroy(&spa
->spa_evicting_os_cv
);
830 cv_destroy(&spa
->spa_proc_cv
);
831 cv_destroy(&spa
->spa_scrub_io_cv
);
832 cv_destroy(&spa
->spa_suspend_cv
);
833 cv_destroy(&spa
->spa_activities_cv
);
834 cv_destroy(&spa
->spa_waiters_cv
);
836 mutex_destroy(&spa
->spa_flushed_ms_lock
);
837 mutex_destroy(&spa
->spa_async_lock
);
838 mutex_destroy(&spa
->spa_errlist_lock
);
839 mutex_destroy(&spa
->spa_errlog_lock
);
840 mutex_destroy(&spa
->spa_evicting_os_lock
);
841 mutex_destroy(&spa
->spa_history_lock
);
842 mutex_destroy(&spa
->spa_proc_lock
);
843 mutex_destroy(&spa
->spa_props_lock
);
844 mutex_destroy(&spa
->spa_cksum_tmpls_lock
);
845 mutex_destroy(&spa
->spa_scrub_lock
);
846 mutex_destroy(&spa
->spa_suspend_lock
);
847 mutex_destroy(&spa
->spa_vdev_top_lock
);
848 mutex_destroy(&spa
->spa_feat_stats_lock
);
849 mutex_destroy(&spa
->spa_activities_lock
);
851 kmem_free(spa
, sizeof (spa_t
));
855 * Given a pool, return the next pool in the namespace, or NULL if there is
856 * none. If 'prev' is NULL, return the first pool.
859 spa_next(spa_t
*prev
)
861 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
864 return (AVL_NEXT(&spa_namespace_avl
, prev
));
866 return (avl_first(&spa_namespace_avl
));
870 * ==========================================================================
871 * SPA refcount functions
872 * ==========================================================================
876 * Add a reference to the given spa_t. Must have at least one reference, or
877 * have the namespace lock held.
880 spa_open_ref(spa_t
*spa
, const void *tag
)
882 ASSERT(zfs_refcount_count(&spa
->spa_refcount
) >= spa
->spa_minref
||
883 MUTEX_HELD(&spa_namespace_lock
));
884 (void) zfs_refcount_add(&spa
->spa_refcount
, tag
);
888 * Remove a reference to the given spa_t. Must have at least one reference, or
889 * have the namespace lock held.
892 spa_close(spa_t
*spa
, const void *tag
)
894 ASSERT(zfs_refcount_count(&spa
->spa_refcount
) > spa
->spa_minref
||
895 MUTEX_HELD(&spa_namespace_lock
));
896 (void) zfs_refcount_remove(&spa
->spa_refcount
, tag
);
900 * Remove a reference to the given spa_t held by a dsl dir that is
901 * being asynchronously released. Async releases occur from a taskq
902 * performing eviction of dsl datasets and dirs. The namespace lock
903 * isn't held and the hold by the object being evicted may contribute to
904 * spa_minref (e.g. dataset or directory released during pool export),
905 * so the asserts in spa_close() do not apply.
908 spa_async_close(spa_t
*spa
, const void *tag
)
910 (void) zfs_refcount_remove(&spa
->spa_refcount
, tag
);
914 * Check to see if the spa refcount is zero. Must be called with
915 * spa_namespace_lock held. We really compare against spa_minref, which is the
916 * number of references acquired when opening a pool
919 spa_refcount_zero(spa_t
*spa
)
921 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
923 return (zfs_refcount_count(&spa
->spa_refcount
) == spa
->spa_minref
);
927 * ==========================================================================
928 * SPA spare and l2cache tracking
929 * ==========================================================================
933 * Hot spares and cache devices are tracked using the same code below,
934 * for 'auxiliary' devices.
937 typedef struct spa_aux
{
945 spa_aux_compare(const void *a
, const void *b
)
947 const spa_aux_t
*sa
= (const spa_aux_t
*)a
;
948 const spa_aux_t
*sb
= (const spa_aux_t
*)b
;
950 return (TREE_CMP(sa
->aux_guid
, sb
->aux_guid
));
954 spa_aux_add(vdev_t
*vd
, avl_tree_t
*avl
)
960 search
.aux_guid
= vd
->vdev_guid
;
961 if ((aux
= avl_find(avl
, &search
, &where
)) != NULL
) {
964 aux
= kmem_zalloc(sizeof (spa_aux_t
), KM_SLEEP
);
965 aux
->aux_guid
= vd
->vdev_guid
;
967 avl_insert(avl
, aux
, where
);
972 spa_aux_remove(vdev_t
*vd
, avl_tree_t
*avl
)
978 search
.aux_guid
= vd
->vdev_guid
;
979 aux
= avl_find(avl
, &search
, &where
);
983 if (--aux
->aux_count
== 0) {
984 avl_remove(avl
, aux
);
985 kmem_free(aux
, sizeof (spa_aux_t
));
986 } else if (aux
->aux_pool
== spa_guid(vd
->vdev_spa
)) {
987 aux
->aux_pool
= 0ULL;
992 spa_aux_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
, avl_tree_t
*avl
)
994 spa_aux_t search
, *found
;
996 search
.aux_guid
= guid
;
997 found
= avl_find(avl
, &search
, NULL
);
1001 *pool
= found
->aux_pool
;
1008 *refcnt
= found
->aux_count
;
1013 return (found
!= NULL
);
1017 spa_aux_activate(vdev_t
*vd
, avl_tree_t
*avl
)
1019 spa_aux_t search
, *found
;
1022 search
.aux_guid
= vd
->vdev_guid
;
1023 found
= avl_find(avl
, &search
, &where
);
1024 ASSERT(found
!= NULL
);
1025 ASSERT(found
->aux_pool
== 0ULL);
1027 found
->aux_pool
= spa_guid(vd
->vdev_spa
);
1031 * Spares are tracked globally due to the following constraints:
1033 * - A spare may be part of multiple pools.
1034 * - A spare may be added to a pool even if it's actively in use within
1036 * - A spare in use in any pool can only be the source of a replacement if
1037 * the target is a spare in the same pool.
1039 * We keep track of all spares on the system through the use of a reference
1040 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
1041 * spare, then we bump the reference count in the AVL tree. In addition, we set
1042 * the 'vdev_isspare' member to indicate that the device is a spare (active or
1043 * inactive). When a spare is made active (used to replace a device in the
1044 * pool), we also keep track of which pool its been made a part of.
1046 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
1047 * called under the spa_namespace lock as part of vdev reconfiguration. The
1048 * separate spare lock exists for the status query path, which does not need to
1049 * be completely consistent with respect to other vdev configuration changes.
1053 spa_spare_compare(const void *a
, const void *b
)
1055 return (spa_aux_compare(a
, b
));
1059 spa_spare_add(vdev_t
*vd
)
1061 mutex_enter(&spa_spare_lock
);
1062 ASSERT(!vd
->vdev_isspare
);
1063 spa_aux_add(vd
, &spa_spare_avl
);
1064 vd
->vdev_isspare
= B_TRUE
;
1065 mutex_exit(&spa_spare_lock
);
1069 spa_spare_remove(vdev_t
*vd
)
1071 mutex_enter(&spa_spare_lock
);
1072 ASSERT(vd
->vdev_isspare
);
1073 spa_aux_remove(vd
, &spa_spare_avl
);
1074 vd
->vdev_isspare
= B_FALSE
;
1075 mutex_exit(&spa_spare_lock
);
1079 spa_spare_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
)
1083 mutex_enter(&spa_spare_lock
);
1084 found
= spa_aux_exists(guid
, pool
, refcnt
, &spa_spare_avl
);
1085 mutex_exit(&spa_spare_lock
);
1091 spa_spare_activate(vdev_t
*vd
)
1093 mutex_enter(&spa_spare_lock
);
1094 ASSERT(vd
->vdev_isspare
);
1095 spa_aux_activate(vd
, &spa_spare_avl
);
1096 mutex_exit(&spa_spare_lock
);
1100 * Level 2 ARC devices are tracked globally for the same reasons as spares.
1101 * Cache devices currently only support one pool per cache device, and so
1102 * for these devices the aux reference count is currently unused beyond 1.
1106 spa_l2cache_compare(const void *a
, const void *b
)
1108 return (spa_aux_compare(a
, b
));
1112 spa_l2cache_add(vdev_t
*vd
)
1114 mutex_enter(&spa_l2cache_lock
);
1115 ASSERT(!vd
->vdev_isl2cache
);
1116 spa_aux_add(vd
, &spa_l2cache_avl
);
1117 vd
->vdev_isl2cache
= B_TRUE
;
1118 mutex_exit(&spa_l2cache_lock
);
1122 spa_l2cache_remove(vdev_t
*vd
)
1124 mutex_enter(&spa_l2cache_lock
);
1125 ASSERT(vd
->vdev_isl2cache
);
1126 spa_aux_remove(vd
, &spa_l2cache_avl
);
1127 vd
->vdev_isl2cache
= B_FALSE
;
1128 mutex_exit(&spa_l2cache_lock
);
1132 spa_l2cache_exists(uint64_t guid
, uint64_t *pool
)
1136 mutex_enter(&spa_l2cache_lock
);
1137 found
= spa_aux_exists(guid
, pool
, NULL
, &spa_l2cache_avl
);
1138 mutex_exit(&spa_l2cache_lock
);
1144 spa_l2cache_activate(vdev_t
*vd
)
1146 mutex_enter(&spa_l2cache_lock
);
1147 ASSERT(vd
->vdev_isl2cache
);
1148 spa_aux_activate(vd
, &spa_l2cache_avl
);
1149 mutex_exit(&spa_l2cache_lock
);
1153 * ==========================================================================
1155 * ==========================================================================
1159 * Lock the given spa_t for the purpose of adding or removing a vdev.
1160 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
1161 * It returns the next transaction group for the spa_t.
1164 spa_vdev_enter(spa_t
*spa
)
1166 mutex_enter(&spa
->spa_vdev_top_lock
);
1167 mutex_enter(&spa_namespace_lock
);
1169 vdev_autotrim_stop_all(spa
);
1171 return (spa_vdev_config_enter(spa
));
1175 * The same as spa_vdev_enter() above but additionally takes the guid of
1176 * the vdev being detached. When there is a rebuild in process it will be
1177 * suspended while the vdev tree is modified then resumed by spa_vdev_exit().
1178 * The rebuild is canceled if only a single child remains after the detach.
1181 spa_vdev_detach_enter(spa_t
*spa
, uint64_t guid
)
1183 mutex_enter(&spa
->spa_vdev_top_lock
);
1184 mutex_enter(&spa_namespace_lock
);
1186 vdev_autotrim_stop_all(spa
);
1189 vdev_t
*vd
= spa_lookup_by_guid(spa
, guid
, B_FALSE
);
1191 vdev_rebuild_stop_wait(vd
->vdev_top
);
1195 return (spa_vdev_config_enter(spa
));
1199 * Internal implementation for spa_vdev_enter(). Used when a vdev
1200 * operation requires multiple syncs (i.e. removing a device) while
1201 * keeping the spa_namespace_lock held.
1204 spa_vdev_config_enter(spa_t
*spa
)
1206 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1208 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1210 return (spa_last_synced_txg(spa
) + 1);
1214 * Used in combination with spa_vdev_config_enter() to allow the syncing
1215 * of multiple transactions without releasing the spa_namespace_lock.
1218 spa_vdev_config_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
,
1221 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1223 int config_changed
= B_FALSE
;
1225 ASSERT(txg
> spa_last_synced_txg(spa
));
1227 spa
->spa_pending_vdev
= NULL
;
1230 * Reassess the DTLs.
1232 vdev_dtl_reassess(spa
->spa_root_vdev
, 0, 0, B_FALSE
, B_FALSE
);
1234 if (error
== 0 && !list_is_empty(&spa
->spa_config_dirty_list
)) {
1235 config_changed
= B_TRUE
;
1236 spa
->spa_config_generation
++;
1240 * Verify the metaslab classes.
1242 ASSERT(metaslab_class_validate(spa_normal_class(spa
)) == 0);
1243 ASSERT(metaslab_class_validate(spa_log_class(spa
)) == 0);
1244 ASSERT(metaslab_class_validate(spa_embedded_log_class(spa
)) == 0);
1245 ASSERT(metaslab_class_validate(spa_special_class(spa
)) == 0);
1246 ASSERT(metaslab_class_validate(spa_dedup_class(spa
)) == 0);
1248 spa_config_exit(spa
, SCL_ALL
, spa
);
1251 * Panic the system if the specified tag requires it. This
1252 * is useful for ensuring that configurations are updated
1255 if (zio_injection_enabled
)
1256 zio_handle_panic_injection(spa
, tag
, 0);
1259 * Note: this txg_wait_synced() is important because it ensures
1260 * that there won't be more than one config change per txg.
1261 * This allows us to use the txg as the generation number.
1264 txg_wait_synced(spa
->spa_dsl_pool
, txg
);
1267 ASSERT(!vd
->vdev_detached
|| vd
->vdev_dtl_sm
== NULL
);
1268 if (vd
->vdev_ops
->vdev_op_leaf
) {
1269 mutex_enter(&vd
->vdev_initialize_lock
);
1270 vdev_initialize_stop(vd
, VDEV_INITIALIZE_CANCELED
,
1272 mutex_exit(&vd
->vdev_initialize_lock
);
1274 mutex_enter(&vd
->vdev_trim_lock
);
1275 vdev_trim_stop(vd
, VDEV_TRIM_CANCELED
, NULL
);
1276 mutex_exit(&vd
->vdev_trim_lock
);
1280 * The vdev may be both a leaf and top-level device.
1282 vdev_autotrim_stop_wait(vd
);
1284 spa_config_enter(spa
, SCL_STATE_ALL
, spa
, RW_WRITER
);
1286 spa_config_exit(spa
, SCL_STATE_ALL
, spa
);
1290 * If the config changed, update the config cache.
1293 spa_write_cachefile(spa
, B_FALSE
, B_TRUE
, B_TRUE
);
1297 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
1298 * locking of spa_vdev_enter(), we also want make sure the transactions have
1299 * synced to disk, and then update the global configuration cache with the new
1303 spa_vdev_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
)
1305 vdev_autotrim_restart(spa
);
1306 vdev_rebuild_restart(spa
);
1308 spa_vdev_config_exit(spa
, vd
, txg
, error
, FTAG
);
1309 mutex_exit(&spa_namespace_lock
);
1310 mutex_exit(&spa
->spa_vdev_top_lock
);
1316 * Lock the given spa_t for the purpose of changing vdev state.
1319 spa_vdev_state_enter(spa_t
*spa
, int oplocks
)
1321 int locks
= SCL_STATE_ALL
| oplocks
;
1324 * Root pools may need to read of the underlying devfs filesystem
1325 * when opening up a vdev. Unfortunately if we're holding the
1326 * SCL_ZIO lock it will result in a deadlock when we try to issue
1327 * the read from the root filesystem. Instead we "prefetch"
1328 * the associated vnodes that we need prior to opening the
1329 * underlying devices and cache them so that we can prevent
1330 * any I/O when we are doing the actual open.
1332 if (spa_is_root(spa
)) {
1333 int low
= locks
& ~(SCL_ZIO
- 1);
1334 int high
= locks
& ~low
;
1336 spa_config_enter(spa
, high
, spa
, RW_WRITER
);
1337 vdev_hold(spa
->spa_root_vdev
);
1338 spa_config_enter(spa
, low
, spa
, RW_WRITER
);
1340 spa_config_enter(spa
, locks
, spa
, RW_WRITER
);
1342 spa
->spa_vdev_locks
= locks
;
1346 spa_vdev_state_exit(spa_t
*spa
, vdev_t
*vd
, int error
)
1348 boolean_t config_changed
= B_FALSE
;
1351 if (vd
== NULL
|| vd
== spa
->spa_root_vdev
) {
1352 vdev_top
= spa
->spa_root_vdev
;
1354 vdev_top
= vd
->vdev_top
;
1357 if (vd
!= NULL
|| error
== 0)
1358 vdev_dtl_reassess(vdev_top
, 0, 0, B_FALSE
, B_FALSE
);
1361 if (vd
!= spa
->spa_root_vdev
)
1362 vdev_state_dirty(vdev_top
);
1364 config_changed
= B_TRUE
;
1365 spa
->spa_config_generation
++;
1368 if (spa_is_root(spa
))
1369 vdev_rele(spa
->spa_root_vdev
);
1371 ASSERT3U(spa
->spa_vdev_locks
, >=, SCL_STATE_ALL
);
1372 spa_config_exit(spa
, spa
->spa_vdev_locks
, spa
);
1375 * If anything changed, wait for it to sync. This ensures that,
1376 * from the system administrator's perspective, zpool(8) commands
1377 * are synchronous. This is important for things like zpool offline:
1378 * when the command completes, you expect no further I/O from ZFS.
1381 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1384 * If the config changed, update the config cache.
1386 if (config_changed
) {
1387 mutex_enter(&spa_namespace_lock
);
1388 spa_write_cachefile(spa
, B_FALSE
, B_TRUE
, B_FALSE
);
1389 mutex_exit(&spa_namespace_lock
);
1396 * ==========================================================================
1397 * Miscellaneous functions
1398 * ==========================================================================
1402 spa_activate_mos_feature(spa_t
*spa
, const char *feature
, dmu_tx_t
*tx
)
1404 if (!nvlist_exists(spa
->spa_label_features
, feature
)) {
1405 fnvlist_add_boolean(spa
->spa_label_features
, feature
);
1407 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't
1408 * dirty the vdev config because lock SCL_CONFIG is not held.
1409 * Thankfully, in this case we don't need to dirty the config
1410 * because it will be written out anyway when we finish
1411 * creating the pool.
1413 if (tx
->tx_txg
!= TXG_INITIAL
)
1414 vdev_config_dirty(spa
->spa_root_vdev
);
1419 spa_deactivate_mos_feature(spa_t
*spa
, const char *feature
)
1421 if (nvlist_remove_all(spa
->spa_label_features
, feature
) == 0)
1422 vdev_config_dirty(spa
->spa_root_vdev
);
1426 * Return the spa_t associated with given pool_guid, if it exists. If
1427 * device_guid is non-zero, determine whether the pool exists *and* contains
1428 * a device with the specified device_guid.
1431 spa_by_guid(uint64_t pool_guid
, uint64_t device_guid
)
1434 avl_tree_t
*t
= &spa_namespace_avl
;
1436 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1438 for (spa
= avl_first(t
); spa
!= NULL
; spa
= AVL_NEXT(t
, spa
)) {
1439 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1441 if (spa
->spa_root_vdev
== NULL
)
1443 if (spa_guid(spa
) == pool_guid
) {
1444 if (device_guid
== 0)
1447 if (vdev_lookup_by_guid(spa
->spa_root_vdev
,
1448 device_guid
) != NULL
)
1452 * Check any devices we may be in the process of adding.
1454 if (spa
->spa_pending_vdev
) {
1455 if (vdev_lookup_by_guid(spa
->spa_pending_vdev
,
1456 device_guid
) != NULL
)
1466 * Determine whether a pool with the given pool_guid exists.
1469 spa_guid_exists(uint64_t pool_guid
, uint64_t device_guid
)
1471 return (spa_by_guid(pool_guid
, device_guid
) != NULL
);
1475 spa_strdup(const char *s
)
1481 new = kmem_alloc(len
+ 1, KM_SLEEP
);
1482 memcpy(new, s
, len
+ 1);
1488 spa_strfree(char *s
)
1490 kmem_free(s
, strlen(s
) + 1);
1494 spa_generate_guid(spa_t
*spa
)
1500 (void) random_get_pseudo_bytes((void *)&guid
,
1502 } while (guid
== 0 || spa_guid_exists(spa_guid(spa
), guid
));
1505 (void) random_get_pseudo_bytes((void *)&guid
,
1507 } while (guid
== 0 || spa_guid_exists(guid
, 0));
1514 snprintf_blkptr(char *buf
, size_t buflen
, const blkptr_t
*bp
)
1517 const char *checksum
= NULL
;
1518 const char *compress
= NULL
;
1521 if (BP_GET_TYPE(bp
) & DMU_OT_NEWTYPE
) {
1522 dmu_object_byteswap_t bswap
=
1523 DMU_OT_BYTESWAP(BP_GET_TYPE(bp
));
1524 (void) snprintf(type
, sizeof (type
), "bswap %s %s",
1525 DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) ?
1526 "metadata" : "data",
1527 dmu_ot_byteswap
[bswap
].ob_name
);
1529 (void) strlcpy(type
, dmu_ot
[BP_GET_TYPE(bp
)].ot_name
,
1532 if (!BP_IS_EMBEDDED(bp
)) {
1534 zio_checksum_table
[BP_GET_CHECKSUM(bp
)].ci_name
;
1536 compress
= zio_compress_table
[BP_GET_COMPRESS(bp
)].ci_name
;
1539 SNPRINTF_BLKPTR(kmem_scnprintf
, ' ', buf
, buflen
, bp
, type
, checksum
,
1544 spa_freeze(spa_t
*spa
)
1546 uint64_t freeze_txg
= 0;
1548 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1549 if (spa
->spa_freeze_txg
== UINT64_MAX
) {
1550 freeze_txg
= spa_last_synced_txg(spa
) + TXG_SIZE
;
1551 spa
->spa_freeze_txg
= freeze_txg
;
1553 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1554 if (freeze_txg
!= 0)
1555 txg_wait_synced(spa_get_dsl(spa
), freeze_txg
);
1559 zfs_panic_recover(const char *fmt
, ...)
1564 vcmn_err(zfs_recover
? CE_WARN
: CE_PANIC
, fmt
, adx
);
1569 * This is a stripped-down version of strtoull, suitable only for converting
1570 * lowercase hexadecimal numbers that don't overflow.
1573 zfs_strtonum(const char *str
, char **nptr
)
1579 while ((c
= *str
) != '\0') {
1580 if (c
>= '0' && c
<= '9')
1582 else if (c
>= 'a' && c
<= 'f')
1583 digit
= 10 + c
- 'a';
1594 *nptr
= (char *)str
;
1600 spa_activate_allocation_classes(spa_t
*spa
, dmu_tx_t
*tx
)
1603 * We bump the feature refcount for each special vdev added to the pool
1605 ASSERT(spa_feature_is_enabled(spa
, SPA_FEATURE_ALLOCATION_CLASSES
));
1606 spa_feature_incr(spa
, SPA_FEATURE_ALLOCATION_CLASSES
, tx
);
1610 * ==========================================================================
1611 * Accessor functions
1612 * ==========================================================================
1616 spa_shutting_down(spa_t
*spa
)
1618 return (spa
->spa_async_suspended
);
1622 spa_get_dsl(spa_t
*spa
)
1624 return (spa
->spa_dsl_pool
);
1628 spa_is_initializing(spa_t
*spa
)
1630 return (spa
->spa_is_initializing
);
1634 spa_indirect_vdevs_loaded(spa_t
*spa
)
1636 return (spa
->spa_indirect_vdevs_loaded
);
1640 spa_get_rootblkptr(spa_t
*spa
)
1642 return (&spa
->spa_ubsync
.ub_rootbp
);
1646 spa_set_rootblkptr(spa_t
*spa
, const blkptr_t
*bp
)
1648 spa
->spa_uberblock
.ub_rootbp
= *bp
;
1652 spa_altroot(spa_t
*spa
, char *buf
, size_t buflen
)
1654 if (spa
->spa_root
== NULL
)
1657 (void) strlcpy(buf
, spa
->spa_root
, buflen
);
1661 spa_sync_pass(spa_t
*spa
)
1663 return (spa
->spa_sync_pass
);
1667 spa_name(spa_t
*spa
)
1669 return (spa
->spa_name
);
1673 spa_guid(spa_t
*spa
)
1675 dsl_pool_t
*dp
= spa_get_dsl(spa
);
1679 * If we fail to parse the config during spa_load(), we can go through
1680 * the error path (which posts an ereport) and end up here with no root
1681 * vdev. We stash the original pool guid in 'spa_config_guid' to handle
1684 if (spa
->spa_root_vdev
== NULL
)
1685 return (spa
->spa_config_guid
);
1687 guid
= spa
->spa_last_synced_guid
!= 0 ?
1688 spa
->spa_last_synced_guid
: spa
->spa_root_vdev
->vdev_guid
;
1691 * Return the most recently synced out guid unless we're
1692 * in syncing context.
1694 if (dp
&& dsl_pool_sync_context(dp
))
1695 return (spa
->spa_root_vdev
->vdev_guid
);
1701 spa_load_guid(spa_t
*spa
)
1704 * This is a GUID that exists solely as a reference for the
1705 * purposes of the arc. It is generated at load time, and
1706 * is never written to persistent storage.
1708 return (spa
->spa_load_guid
);
1712 spa_last_synced_txg(spa_t
*spa
)
1714 return (spa
->spa_ubsync
.ub_txg
);
1718 spa_first_txg(spa_t
*spa
)
1720 return (spa
->spa_first_txg
);
1724 spa_syncing_txg(spa_t
*spa
)
1726 return (spa
->spa_syncing_txg
);
1730 * Return the last txg where data can be dirtied. The final txgs
1731 * will be used to just clear out any deferred frees that remain.
1734 spa_final_dirty_txg(spa_t
*spa
)
1736 return (spa
->spa_final_txg
- TXG_DEFER_SIZE
);
1740 spa_state(spa_t
*spa
)
1742 return (spa
->spa_state
);
1746 spa_load_state(spa_t
*spa
)
1748 return (spa
->spa_load_state
);
1752 spa_freeze_txg(spa_t
*spa
)
1754 return (spa
->spa_freeze_txg
);
1758 * Return the inflated asize for a logical write in bytes. This is used by the
1759 * DMU to calculate the space a logical write will require on disk.
1760 * If lsize is smaller than the largest physical block size allocatable on this
1761 * pool we use its value instead, since the write will end up using the whole
1765 spa_get_worst_case_asize(spa_t
*spa
, uint64_t lsize
)
1768 return (0); /* No inflation needed */
1769 return (MAX(lsize
, 1 << spa
->spa_max_ashift
) * spa_asize_inflation
);
1773 * Return the amount of slop space in bytes. It is typically 1/32 of the pool
1774 * (3.2%), minus the embedded log space. On very small pools, it may be
1775 * slightly larger than this. On very large pools, it will be capped to
1776 * the value of spa_max_slop. The embedded log space is not included in
1777 * spa_dspace. By subtracting it, the usable space (per "zfs list") is a
1778 * constant 97% of the total space, regardless of metaslab size (assuming the
1779 * default spa_slop_shift=5 and a non-tiny pool).
1781 * See the comment above spa_slop_shift for more details.
1784 spa_get_slop_space(spa_t
*spa
)
1790 * Make sure spa_dedup_dspace has been set.
1792 if (spa
->spa_dedup_dspace
== ~0ULL)
1793 spa_update_dspace(spa
);
1796 * spa_get_dspace() includes the space only logically "used" by
1797 * deduplicated data, so since it's not useful to reserve more
1798 * space with more deduplicated data, we subtract that out here.
1800 space
= spa_get_dspace(spa
) - spa
->spa_dedup_dspace
;
1801 slop
= MIN(space
>> spa_slop_shift
, spa_max_slop
);
1804 * Subtract the embedded log space, but no more than half the (3.2%)
1805 * unusable space. Note, the "no more than half" is only relevant if
1806 * zfs_embedded_slog_min_ms >> spa_slop_shift < 2, which is not true by
1809 uint64_t embedded_log
=
1810 metaslab_class_get_dspace(spa_embedded_log_class(spa
));
1811 slop
-= MIN(embedded_log
, slop
>> 1);
1814 * Slop space should be at least spa_min_slop, but no more than half
1817 slop
= MAX(slop
, MIN(space
>> 1, spa_min_slop
));
1822 spa_get_dspace(spa_t
*spa
)
1824 return (spa
->spa_dspace
);
1828 spa_get_checkpoint_space(spa_t
*spa
)
1830 return (spa
->spa_checkpoint_info
.sci_dspace
);
1834 spa_update_dspace(spa_t
*spa
)
1836 spa
->spa_dspace
= metaslab_class_get_dspace(spa_normal_class(spa
)) +
1837 ddt_get_dedup_dspace(spa
);
1838 if (spa
->spa_nonallocating_dspace
> 0) {
1840 * Subtract the space provided by all non-allocating vdevs that
1841 * contribute to dspace. If a file is overwritten, its old
1842 * blocks are freed and new blocks are allocated. If there are
1843 * no snapshots of the file, the available space should remain
1844 * the same. The old blocks could be freed from the
1845 * non-allocating vdev, but the new blocks must be allocated on
1846 * other (allocating) vdevs. By reserving the entire size of
1847 * the non-allocating vdevs (including allocated space), we
1848 * ensure that there will be enough space on the allocating
1849 * vdevs for this file overwrite to succeed.
1851 * Note that the DMU/DSL doesn't actually know or care
1852 * how much space is allocated (it does its own tracking
1853 * of how much space has been logically used). So it
1854 * doesn't matter that the data we are moving may be
1855 * allocated twice (on the old device and the new device).
1857 ASSERT3U(spa
->spa_dspace
, >=, spa
->spa_nonallocating_dspace
);
1858 spa
->spa_dspace
-= spa
->spa_nonallocating_dspace
;
1863 * Return the failure mode that has been set to this pool. The default
1864 * behavior will be to block all I/Os when a complete failure occurs.
1867 spa_get_failmode(spa_t
*spa
)
1869 return (spa
->spa_failmode
);
1873 spa_suspended(spa_t
*spa
)
1875 return (spa
->spa_suspended
!= ZIO_SUSPEND_NONE
);
1879 spa_version(spa_t
*spa
)
1881 return (spa
->spa_ubsync
.ub_version
);
1885 spa_deflate(spa_t
*spa
)
1887 return (spa
->spa_deflate
);
1891 spa_normal_class(spa_t
*spa
)
1893 return (spa
->spa_normal_class
);
1897 spa_log_class(spa_t
*spa
)
1899 return (spa
->spa_log_class
);
1903 spa_embedded_log_class(spa_t
*spa
)
1905 return (spa
->spa_embedded_log_class
);
1909 spa_special_class(spa_t
*spa
)
1911 return (spa
->spa_special_class
);
1915 spa_dedup_class(spa_t
*spa
)
1917 return (spa
->spa_dedup_class
);
1921 * Locate an appropriate allocation class
1924 spa_preferred_class(spa_t
*spa
, uint64_t size
, dmu_object_type_t objtype
,
1925 uint_t level
, uint_t special_smallblk
)
1928 * ZIL allocations determine their class in zio_alloc_zil().
1930 ASSERT(objtype
!= DMU_OT_INTENT_LOG
);
1932 boolean_t has_special_class
= spa
->spa_special_class
->mc_groups
!= 0;
1934 if (DMU_OT_IS_DDT(objtype
)) {
1935 if (spa
->spa_dedup_class
->mc_groups
!= 0)
1936 return (spa_dedup_class(spa
));
1937 else if (has_special_class
&& zfs_ddt_data_is_special
)
1938 return (spa_special_class(spa
));
1940 return (spa_normal_class(spa
));
1943 /* Indirect blocks for user data can land in special if allowed */
1944 if (level
> 0 && (DMU_OT_IS_FILE(objtype
) || objtype
== DMU_OT_ZVOL
)) {
1945 if (has_special_class
&& zfs_user_indirect_is_special
)
1946 return (spa_special_class(spa
));
1948 return (spa_normal_class(spa
));
1951 if (DMU_OT_IS_METADATA(objtype
) || level
> 0) {
1952 if (has_special_class
)
1953 return (spa_special_class(spa
));
1955 return (spa_normal_class(spa
));
1959 * Allow small file blocks in special class in some cases (like
1960 * for the dRAID vdev feature). But always leave a reserve of
1961 * zfs_special_class_metadata_reserve_pct exclusively for metadata.
1963 if (DMU_OT_IS_FILE(objtype
) &&
1964 has_special_class
&& size
<= special_smallblk
) {
1965 metaslab_class_t
*special
= spa_special_class(spa
);
1966 uint64_t alloc
= metaslab_class_get_alloc(special
);
1967 uint64_t space
= metaslab_class_get_space(special
);
1969 (space
* (100 - zfs_special_class_metadata_reserve_pct
))
1976 return (spa_normal_class(spa
));
1980 spa_evicting_os_register(spa_t
*spa
, objset_t
*os
)
1982 mutex_enter(&spa
->spa_evicting_os_lock
);
1983 list_insert_head(&spa
->spa_evicting_os_list
, os
);
1984 mutex_exit(&spa
->spa_evicting_os_lock
);
1988 spa_evicting_os_deregister(spa_t
*spa
, objset_t
*os
)
1990 mutex_enter(&spa
->spa_evicting_os_lock
);
1991 list_remove(&spa
->spa_evicting_os_list
, os
);
1992 cv_broadcast(&spa
->spa_evicting_os_cv
);
1993 mutex_exit(&spa
->spa_evicting_os_lock
);
1997 spa_evicting_os_wait(spa_t
*spa
)
1999 mutex_enter(&spa
->spa_evicting_os_lock
);
2000 while (!list_is_empty(&spa
->spa_evicting_os_list
))
2001 cv_wait(&spa
->spa_evicting_os_cv
, &spa
->spa_evicting_os_lock
);
2002 mutex_exit(&spa
->spa_evicting_os_lock
);
2004 dmu_buf_user_evict_wait();
2008 spa_max_replication(spa_t
*spa
)
2011 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
2012 * handle BPs with more than one DVA allocated. Set our max
2013 * replication level accordingly.
2015 if (spa_version(spa
) < SPA_VERSION_DITTO_BLOCKS
)
2017 return (MIN(SPA_DVAS_PER_BP
, spa_max_replication_override
));
2021 spa_prev_software_version(spa_t
*spa
)
2023 return (spa
->spa_prev_software_version
);
2027 spa_deadman_synctime(spa_t
*spa
)
2029 return (spa
->spa_deadman_synctime
);
2033 spa_get_autotrim(spa_t
*spa
)
2035 return (spa
->spa_autotrim
);
2039 spa_deadman_ziotime(spa_t
*spa
)
2041 return (spa
->spa_deadman_ziotime
);
2045 spa_get_deadman_failmode(spa_t
*spa
)
2047 return (spa
->spa_deadman_failmode
);
2051 spa_set_deadman_failmode(spa_t
*spa
, const char *failmode
)
2053 if (strcmp(failmode
, "wait") == 0)
2054 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_WAIT
;
2055 else if (strcmp(failmode
, "continue") == 0)
2056 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_CONTINUE
;
2057 else if (strcmp(failmode
, "panic") == 0)
2058 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_PANIC
;
2060 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_WAIT
;
2064 spa_set_deadman_ziotime(hrtime_t ns
)
2068 if (spa_mode_global
!= SPA_MODE_UNINIT
) {
2069 mutex_enter(&spa_namespace_lock
);
2070 while ((spa
= spa_next(spa
)) != NULL
)
2071 spa
->spa_deadman_ziotime
= ns
;
2072 mutex_exit(&spa_namespace_lock
);
2077 spa_set_deadman_synctime(hrtime_t ns
)
2081 if (spa_mode_global
!= SPA_MODE_UNINIT
) {
2082 mutex_enter(&spa_namespace_lock
);
2083 while ((spa
= spa_next(spa
)) != NULL
)
2084 spa
->spa_deadman_synctime
= ns
;
2085 mutex_exit(&spa_namespace_lock
);
2090 dva_get_dsize_sync(spa_t
*spa
, const dva_t
*dva
)
2092 uint64_t asize
= DVA_GET_ASIZE(dva
);
2093 uint64_t dsize
= asize
;
2095 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
2097 if (asize
!= 0 && spa
->spa_deflate
) {
2098 vdev_t
*vd
= vdev_lookup_top(spa
, DVA_GET_VDEV(dva
));
2100 dsize
= (asize
>> SPA_MINBLOCKSHIFT
) *
2101 vd
->vdev_deflate_ratio
;
2108 bp_get_dsize_sync(spa_t
*spa
, const blkptr_t
*bp
)
2112 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
2113 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
2119 bp_get_dsize(spa_t
*spa
, const blkptr_t
*bp
)
2123 spa_config_enter(spa
, SCL_VDEV
, FTAG
, RW_READER
);
2125 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
2126 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
2128 spa_config_exit(spa
, SCL_VDEV
, FTAG
);
2134 spa_dirty_data(spa_t
*spa
)
2136 return (spa
->spa_dsl_pool
->dp_dirty_total
);
2140 * ==========================================================================
2141 * SPA Import Progress Routines
2142 * ==========================================================================
2145 typedef struct spa_import_progress
{
2146 uint64_t pool_guid
; /* unique id for updates */
2148 spa_load_state_t spa_load_state
;
2149 uint64_t mmp_sec_remaining
; /* MMP activity check */
2150 uint64_t spa_load_max_txg
; /* rewind txg */
2151 procfs_list_node_t smh_node
;
2152 } spa_import_progress_t
;
2154 spa_history_list_t
*spa_import_progress_list
= NULL
;
2157 spa_import_progress_show_header(struct seq_file
*f
)
2159 seq_printf(f
, "%-20s %-14s %-14s %-12s %s\n", "pool_guid",
2160 "load_state", "multihost_secs", "max_txg",
2166 spa_import_progress_show(struct seq_file
*f
, void *data
)
2168 spa_import_progress_t
*sip
= (spa_import_progress_t
*)data
;
2170 seq_printf(f
, "%-20llu %-14llu %-14llu %-12llu %s\n",
2171 (u_longlong_t
)sip
->pool_guid
, (u_longlong_t
)sip
->spa_load_state
,
2172 (u_longlong_t
)sip
->mmp_sec_remaining
,
2173 (u_longlong_t
)sip
->spa_load_max_txg
,
2174 (sip
->pool_name
? sip
->pool_name
: "-"));
2179 /* Remove oldest elements from list until there are no more than 'size' left */
2181 spa_import_progress_truncate(spa_history_list_t
*shl
, unsigned int size
)
2183 spa_import_progress_t
*sip
;
2184 while (shl
->size
> size
) {
2185 sip
= list_remove_head(&shl
->procfs_list
.pl_list
);
2187 spa_strfree(sip
->pool_name
);
2188 kmem_free(sip
, sizeof (spa_import_progress_t
));
2192 IMPLY(size
== 0, list_is_empty(&shl
->procfs_list
.pl_list
));
2196 spa_import_progress_init(void)
2198 spa_import_progress_list
= kmem_zalloc(sizeof (spa_history_list_t
),
2201 spa_import_progress_list
->size
= 0;
2203 spa_import_progress_list
->procfs_list
.pl_private
=
2204 spa_import_progress_list
;
2206 procfs_list_install("zfs",
2210 &spa_import_progress_list
->procfs_list
,
2211 spa_import_progress_show
,
2212 spa_import_progress_show_header
,
2214 offsetof(spa_import_progress_t
, smh_node
));
2218 spa_import_progress_destroy(void)
2220 spa_history_list_t
*shl
= spa_import_progress_list
;
2221 procfs_list_uninstall(&shl
->procfs_list
);
2222 spa_import_progress_truncate(shl
, 0);
2223 procfs_list_destroy(&shl
->procfs_list
);
2224 kmem_free(shl
, sizeof (spa_history_list_t
));
2228 spa_import_progress_set_state(uint64_t pool_guid
,
2229 spa_load_state_t load_state
)
2231 spa_history_list_t
*shl
= spa_import_progress_list
;
2232 spa_import_progress_t
*sip
;
2238 mutex_enter(&shl
->procfs_list
.pl_lock
);
2239 for (sip
= list_tail(&shl
->procfs_list
.pl_list
); sip
!= NULL
;
2240 sip
= list_prev(&shl
->procfs_list
.pl_list
, sip
)) {
2241 if (sip
->pool_guid
== pool_guid
) {
2242 sip
->spa_load_state
= load_state
;
2247 mutex_exit(&shl
->procfs_list
.pl_lock
);
2253 spa_import_progress_set_max_txg(uint64_t pool_guid
, uint64_t load_max_txg
)
2255 spa_history_list_t
*shl
= spa_import_progress_list
;
2256 spa_import_progress_t
*sip
;
2262 mutex_enter(&shl
->procfs_list
.pl_lock
);
2263 for (sip
= list_tail(&shl
->procfs_list
.pl_list
); sip
!= NULL
;
2264 sip
= list_prev(&shl
->procfs_list
.pl_list
, sip
)) {
2265 if (sip
->pool_guid
== pool_guid
) {
2266 sip
->spa_load_max_txg
= load_max_txg
;
2271 mutex_exit(&shl
->procfs_list
.pl_lock
);
2277 spa_import_progress_set_mmp_check(uint64_t pool_guid
,
2278 uint64_t mmp_sec_remaining
)
2280 spa_history_list_t
*shl
= spa_import_progress_list
;
2281 spa_import_progress_t
*sip
;
2287 mutex_enter(&shl
->procfs_list
.pl_lock
);
2288 for (sip
= list_tail(&shl
->procfs_list
.pl_list
); sip
!= NULL
;
2289 sip
= list_prev(&shl
->procfs_list
.pl_list
, sip
)) {
2290 if (sip
->pool_guid
== pool_guid
) {
2291 sip
->mmp_sec_remaining
= mmp_sec_remaining
;
2296 mutex_exit(&shl
->procfs_list
.pl_lock
);
2302 * A new import is in progress, add an entry.
2305 spa_import_progress_add(spa_t
*spa
)
2307 spa_history_list_t
*shl
= spa_import_progress_list
;
2308 spa_import_progress_t
*sip
;
2309 char *poolname
= NULL
;
2311 sip
= kmem_zalloc(sizeof (spa_import_progress_t
), KM_SLEEP
);
2312 sip
->pool_guid
= spa_guid(spa
);
2314 (void) nvlist_lookup_string(spa
->spa_config
, ZPOOL_CONFIG_POOL_NAME
,
2316 if (poolname
== NULL
)
2317 poolname
= spa_name(spa
);
2318 sip
->pool_name
= spa_strdup(poolname
);
2319 sip
->spa_load_state
= spa_load_state(spa
);
2321 mutex_enter(&shl
->procfs_list
.pl_lock
);
2322 procfs_list_add(&shl
->procfs_list
, sip
);
2324 mutex_exit(&shl
->procfs_list
.pl_lock
);
2328 spa_import_progress_remove(uint64_t pool_guid
)
2330 spa_history_list_t
*shl
= spa_import_progress_list
;
2331 spa_import_progress_t
*sip
;
2333 mutex_enter(&shl
->procfs_list
.pl_lock
);
2334 for (sip
= list_tail(&shl
->procfs_list
.pl_list
); sip
!= NULL
;
2335 sip
= list_prev(&shl
->procfs_list
.pl_list
, sip
)) {
2336 if (sip
->pool_guid
== pool_guid
) {
2338 spa_strfree(sip
->pool_name
);
2339 list_remove(&shl
->procfs_list
.pl_list
, sip
);
2341 kmem_free(sip
, sizeof (spa_import_progress_t
));
2345 mutex_exit(&shl
->procfs_list
.pl_lock
);
2349 * ==========================================================================
2350 * Initialization and Termination
2351 * ==========================================================================
2355 spa_name_compare(const void *a1
, const void *a2
)
2357 const spa_t
*s1
= a1
;
2358 const spa_t
*s2
= a2
;
2361 s
= strcmp(s1
->spa_name
, s2
->spa_name
);
2363 return (TREE_ISIGN(s
));
2373 spa_init(spa_mode_t mode
)
2375 mutex_init(&spa_namespace_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
2376 mutex_init(&spa_spare_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
2377 mutex_init(&spa_l2cache_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
2378 cv_init(&spa_namespace_cv
, NULL
, CV_DEFAULT
, NULL
);
2380 avl_create(&spa_namespace_avl
, spa_name_compare
, sizeof (spa_t
),
2381 offsetof(spa_t
, spa_avl
));
2383 avl_create(&spa_spare_avl
, spa_spare_compare
, sizeof (spa_aux_t
),
2384 offsetof(spa_aux_t
, aux_avl
));
2386 avl_create(&spa_l2cache_avl
, spa_l2cache_compare
, sizeof (spa_aux_t
),
2387 offsetof(spa_aux_t
, aux_avl
));
2389 spa_mode_global
= mode
;
2392 if (spa_mode_global
!= SPA_MODE_READ
&& dprintf_find_string("watch")) {
2393 struct sigaction sa
;
2395 sa
.sa_flags
= SA_SIGINFO
;
2396 sigemptyset(&sa
.sa_mask
);
2397 sa
.sa_sigaction
= arc_buf_sigsegv
;
2399 if (sigaction(SIGSEGV
, &sa
, NULL
) == -1) {
2400 perror("could not enable watchpoints: "
2401 "sigaction(SIGSEGV, ...) = ");
2409 zfs_refcount_init();
2412 metaslab_stat_init();
2417 vdev_cache_stat_init();
2418 vdev_mirror_stat_init();
2419 vdev_raidz_math_init();
2424 zpool_feature_init();
2430 spa_import_progress_init();
2441 vdev_cache_stat_fini();
2442 vdev_mirror_stat_fini();
2443 vdev_raidz_math_fini();
2449 metaslab_stat_fini();
2452 zfs_refcount_fini();
2456 spa_import_progress_destroy();
2458 avl_destroy(&spa_namespace_avl
);
2459 avl_destroy(&spa_spare_avl
);
2460 avl_destroy(&spa_l2cache_avl
);
2462 cv_destroy(&spa_namespace_cv
);
2463 mutex_destroy(&spa_namespace_lock
);
2464 mutex_destroy(&spa_spare_lock
);
2465 mutex_destroy(&spa_l2cache_lock
);
2469 * Return whether this pool has a dedicated slog device. No locking needed.
2470 * It's not a problem if the wrong answer is returned as it's only for
2471 * performance and not correctness.
2474 spa_has_slogs(spa_t
*spa
)
2476 return (spa
->spa_log_class
->mc_groups
!= 0);
2480 spa_get_log_state(spa_t
*spa
)
2482 return (spa
->spa_log_state
);
2486 spa_set_log_state(spa_t
*spa
, spa_log_state_t state
)
2488 spa
->spa_log_state
= state
;
2492 spa_is_root(spa_t
*spa
)
2494 return (spa
->spa_is_root
);
2498 spa_writeable(spa_t
*spa
)
2500 return (!!(spa
->spa_mode
& SPA_MODE_WRITE
) && spa
->spa_trust_config
);
2504 * Returns true if there is a pending sync task in any of the current
2505 * syncing txg, the current quiescing txg, or the current open txg.
2508 spa_has_pending_synctask(spa_t
*spa
)
2510 return (!txg_all_lists_empty(&spa
->spa_dsl_pool
->dp_sync_tasks
) ||
2511 !txg_all_lists_empty(&spa
->spa_dsl_pool
->dp_early_sync_tasks
));
2515 spa_mode(spa_t
*spa
)
2517 return (spa
->spa_mode
);
2521 spa_bootfs(spa_t
*spa
)
2523 return (spa
->spa_bootfs
);
2527 spa_delegation(spa_t
*spa
)
2529 return (spa
->spa_delegation
);
2533 spa_meta_objset(spa_t
*spa
)
2535 return (spa
->spa_meta_objset
);
2539 spa_dedup_checksum(spa_t
*spa
)
2541 return (spa
->spa_dedup_checksum
);
2545 * Reset pool scan stat per scan pass (or reboot).
2548 spa_scan_stat_init(spa_t
*spa
)
2550 /* data not stored on disk */
2551 spa
->spa_scan_pass_start
= gethrestime_sec();
2552 if (dsl_scan_is_paused_scrub(spa
->spa_dsl_pool
->dp_scan
))
2553 spa
->spa_scan_pass_scrub_pause
= spa
->spa_scan_pass_start
;
2555 spa
->spa_scan_pass_scrub_pause
= 0;
2556 spa
->spa_scan_pass_scrub_spent_paused
= 0;
2557 spa
->spa_scan_pass_exam
= 0;
2558 spa
->spa_scan_pass_issued
= 0;
2559 vdev_scan_stat_init(spa
->spa_root_vdev
);
2563 * Get scan stats for zpool status reports
2566 spa_scan_get_stats(spa_t
*spa
, pool_scan_stat_t
*ps
)
2568 dsl_scan_t
*scn
= spa
->spa_dsl_pool
? spa
->spa_dsl_pool
->dp_scan
: NULL
;
2570 if (scn
== NULL
|| scn
->scn_phys
.scn_func
== POOL_SCAN_NONE
)
2571 return (SET_ERROR(ENOENT
));
2572 memset(ps
, 0, sizeof (pool_scan_stat_t
));
2574 /* data stored on disk */
2575 ps
->pss_func
= scn
->scn_phys
.scn_func
;
2576 ps
->pss_state
= scn
->scn_phys
.scn_state
;
2577 ps
->pss_start_time
= scn
->scn_phys
.scn_start_time
;
2578 ps
->pss_end_time
= scn
->scn_phys
.scn_end_time
;
2579 ps
->pss_to_examine
= scn
->scn_phys
.scn_to_examine
;
2580 ps
->pss_examined
= scn
->scn_phys
.scn_examined
;
2581 ps
->pss_to_process
= scn
->scn_phys
.scn_to_process
;
2582 ps
->pss_processed
= scn
->scn_phys
.scn_processed
;
2583 ps
->pss_errors
= scn
->scn_phys
.scn_errors
;
2585 /* data not stored on disk */
2586 ps
->pss_pass_exam
= spa
->spa_scan_pass_exam
;
2587 ps
->pss_pass_start
= spa
->spa_scan_pass_start
;
2588 ps
->pss_pass_scrub_pause
= spa
->spa_scan_pass_scrub_pause
;
2589 ps
->pss_pass_scrub_spent_paused
= spa
->spa_scan_pass_scrub_spent_paused
;
2590 ps
->pss_pass_issued
= spa
->spa_scan_pass_issued
;
2592 scn
->scn_issued_before_pass
+ spa
->spa_scan_pass_issued
;
2598 spa_maxblocksize(spa_t
*spa
)
2600 if (spa_feature_is_enabled(spa
, SPA_FEATURE_LARGE_BLOCKS
))
2601 return (SPA_MAXBLOCKSIZE
);
2603 return (SPA_OLD_MAXBLOCKSIZE
);
2608 * Returns the txg that the last device removal completed. No indirect mappings
2609 * have been added since this txg.
2612 spa_get_last_removal_txg(spa_t
*spa
)
2615 uint64_t ret
= -1ULL;
2617 spa_config_enter(spa
, SCL_VDEV
, FTAG
, RW_READER
);
2619 * sr_prev_indirect_vdev is only modified while holding all the
2620 * config locks, so it is sufficient to hold SCL_VDEV as reader when
2623 vdevid
= spa
->spa_removing_phys
.sr_prev_indirect_vdev
;
2625 while (vdevid
!= -1ULL) {
2626 vdev_t
*vd
= vdev_lookup_top(spa
, vdevid
);
2627 vdev_indirect_births_t
*vib
= vd
->vdev_indirect_births
;
2629 ASSERT3P(vd
->vdev_ops
, ==, &vdev_indirect_ops
);
2632 * If the removal did not remap any data, we don't care.
2634 if (vdev_indirect_births_count(vib
) != 0) {
2635 ret
= vdev_indirect_births_last_entry_txg(vib
);
2639 vdevid
= vd
->vdev_indirect_config
.vic_prev_indirect_vdev
;
2641 spa_config_exit(spa
, SCL_VDEV
, FTAG
);
2644 spa_feature_is_active(spa
, SPA_FEATURE_DEVICE_REMOVAL
));
2650 spa_maxdnodesize(spa_t
*spa
)
2652 if (spa_feature_is_enabled(spa
, SPA_FEATURE_LARGE_DNODE
))
2653 return (DNODE_MAX_SIZE
);
2655 return (DNODE_MIN_SIZE
);
2659 spa_multihost(spa_t
*spa
)
2661 return (spa
->spa_multihost
? B_TRUE
: B_FALSE
);
2665 spa_get_hostid(spa_t
*spa
)
2667 return (spa
->spa_hostid
);
2671 spa_trust_config(spa_t
*spa
)
2673 return (spa
->spa_trust_config
);
2677 spa_missing_tvds_allowed(spa_t
*spa
)
2679 return (spa
->spa_missing_tvds_allowed
);
2683 spa_syncing_log_sm(spa_t
*spa
)
2685 return (spa
->spa_syncing_log_sm
);
2689 spa_set_missing_tvds(spa_t
*spa
, uint64_t missing
)
2691 spa
->spa_missing_tvds
= missing
;
2695 * Return the pool state string ("ONLINE", "DEGRADED", "SUSPENDED", etc).
2698 spa_state_to_name(spa_t
*spa
)
2700 ASSERT3P(spa
, !=, NULL
);
2703 * it is possible for the spa to exist, without root vdev
2704 * as the spa transitions during import/export
2706 vdev_t
*rvd
= spa
->spa_root_vdev
;
2708 return ("TRANSITIONING");
2710 vdev_state_t state
= rvd
->vdev_state
;
2711 vdev_aux_t aux
= rvd
->vdev_stat
.vs_aux
;
2713 if (spa_suspended(spa
) &&
2714 (spa_get_failmode(spa
) != ZIO_FAILURE_MODE_CONTINUE
))
2715 return ("SUSPENDED");
2718 case VDEV_STATE_CLOSED
:
2719 case VDEV_STATE_OFFLINE
:
2721 case VDEV_STATE_REMOVED
:
2723 case VDEV_STATE_CANT_OPEN
:
2724 if (aux
== VDEV_AUX_CORRUPT_DATA
|| aux
== VDEV_AUX_BAD_LOG
)
2726 else if (aux
== VDEV_AUX_SPLIT_POOL
)
2730 case VDEV_STATE_FAULTED
:
2732 case VDEV_STATE_DEGRADED
:
2733 return ("DEGRADED");
2734 case VDEV_STATE_HEALTHY
:
2744 spa_top_vdevs_spacemap_addressable(spa_t
*spa
)
2746 vdev_t
*rvd
= spa
->spa_root_vdev
;
2747 for (uint64_t c
= 0; c
< rvd
->vdev_children
; c
++) {
2748 if (!vdev_is_spacemap_addressable(rvd
->vdev_child
[c
]))
2755 spa_has_checkpoint(spa_t
*spa
)
2757 return (spa
->spa_checkpoint_txg
!= 0);
2761 spa_importing_readonly_checkpoint(spa_t
*spa
)
2763 return ((spa
->spa_import_flags
& ZFS_IMPORT_CHECKPOINT
) &&
2764 spa
->spa_mode
== SPA_MODE_READ
);
2768 spa_min_claim_txg(spa_t
*spa
)
2770 uint64_t checkpoint_txg
= spa
->spa_uberblock
.ub_checkpoint_txg
;
2772 if (checkpoint_txg
!= 0)
2773 return (checkpoint_txg
+ 1);
2775 return (spa
->spa_first_txg
);
2779 * If there is a checkpoint, async destroys may consume more space from
2780 * the pool instead of freeing it. In an attempt to save the pool from
2781 * getting suspended when it is about to run out of space, we stop
2782 * processing async destroys.
2785 spa_suspend_async_destroy(spa_t
*spa
)
2787 dsl_pool_t
*dp
= spa_get_dsl(spa
);
2789 uint64_t unreserved
= dsl_pool_unreserved_space(dp
,
2790 ZFS_SPACE_CHECK_EXTRA_RESERVED
);
2791 uint64_t used
= dsl_dir_phys(dp
->dp_root_dir
)->dd_used_bytes
;
2792 uint64_t avail
= (unreserved
> used
) ? (unreserved
- used
) : 0;
2794 if (spa_has_checkpoint(spa
) && avail
== 0)
2800 #if defined(_KERNEL)
2803 param_set_deadman_failmode_common(const char *val
)
2809 return (SET_ERROR(EINVAL
));
2811 if ((p
= strchr(val
, '\n')) != NULL
)
2814 if (strcmp(val
, "wait") != 0 && strcmp(val
, "continue") != 0 &&
2815 strcmp(val
, "panic"))
2816 return (SET_ERROR(EINVAL
));
2818 if (spa_mode_global
!= SPA_MODE_UNINIT
) {
2819 mutex_enter(&spa_namespace_lock
);
2820 while ((spa
= spa_next(spa
)) != NULL
)
2821 spa_set_deadman_failmode(spa
, val
);
2822 mutex_exit(&spa_namespace_lock
);
2829 /* Namespace manipulation */
2830 EXPORT_SYMBOL(spa_lookup
);
2831 EXPORT_SYMBOL(spa_add
);
2832 EXPORT_SYMBOL(spa_remove
);
2833 EXPORT_SYMBOL(spa_next
);
2835 /* Refcount functions */
2836 EXPORT_SYMBOL(spa_open_ref
);
2837 EXPORT_SYMBOL(spa_close
);
2838 EXPORT_SYMBOL(spa_refcount_zero
);
2840 /* Pool configuration lock */
2841 EXPORT_SYMBOL(spa_config_tryenter
);
2842 EXPORT_SYMBOL(spa_config_enter
);
2843 EXPORT_SYMBOL(spa_config_exit
);
2844 EXPORT_SYMBOL(spa_config_held
);
2846 /* Pool vdev add/remove lock */
2847 EXPORT_SYMBOL(spa_vdev_enter
);
2848 EXPORT_SYMBOL(spa_vdev_exit
);
2850 /* Pool vdev state change lock */
2851 EXPORT_SYMBOL(spa_vdev_state_enter
);
2852 EXPORT_SYMBOL(spa_vdev_state_exit
);
2854 /* Accessor functions */
2855 EXPORT_SYMBOL(spa_shutting_down
);
2856 EXPORT_SYMBOL(spa_get_dsl
);
2857 EXPORT_SYMBOL(spa_get_rootblkptr
);
2858 EXPORT_SYMBOL(spa_set_rootblkptr
);
2859 EXPORT_SYMBOL(spa_altroot
);
2860 EXPORT_SYMBOL(spa_sync_pass
);
2861 EXPORT_SYMBOL(spa_name
);
2862 EXPORT_SYMBOL(spa_guid
);
2863 EXPORT_SYMBOL(spa_last_synced_txg
);
2864 EXPORT_SYMBOL(spa_first_txg
);
2865 EXPORT_SYMBOL(spa_syncing_txg
);
2866 EXPORT_SYMBOL(spa_version
);
2867 EXPORT_SYMBOL(spa_state
);
2868 EXPORT_SYMBOL(spa_load_state
);
2869 EXPORT_SYMBOL(spa_freeze_txg
);
2870 EXPORT_SYMBOL(spa_get_dspace
);
2871 EXPORT_SYMBOL(spa_update_dspace
);
2872 EXPORT_SYMBOL(spa_deflate
);
2873 EXPORT_SYMBOL(spa_normal_class
);
2874 EXPORT_SYMBOL(spa_log_class
);
2875 EXPORT_SYMBOL(spa_special_class
);
2876 EXPORT_SYMBOL(spa_preferred_class
);
2877 EXPORT_SYMBOL(spa_max_replication
);
2878 EXPORT_SYMBOL(spa_prev_software_version
);
2879 EXPORT_SYMBOL(spa_get_failmode
);
2880 EXPORT_SYMBOL(spa_suspended
);
2881 EXPORT_SYMBOL(spa_bootfs
);
2882 EXPORT_SYMBOL(spa_delegation
);
2883 EXPORT_SYMBOL(spa_meta_objset
);
2884 EXPORT_SYMBOL(spa_maxblocksize
);
2885 EXPORT_SYMBOL(spa_maxdnodesize
);
2887 /* Miscellaneous support routines */
2888 EXPORT_SYMBOL(spa_guid_exists
);
2889 EXPORT_SYMBOL(spa_strdup
);
2890 EXPORT_SYMBOL(spa_strfree
);
2891 EXPORT_SYMBOL(spa_generate_guid
);
2892 EXPORT_SYMBOL(snprintf_blkptr
);
2893 EXPORT_SYMBOL(spa_freeze
);
2894 EXPORT_SYMBOL(spa_upgrade
);
2895 EXPORT_SYMBOL(spa_evict_all
);
2896 EXPORT_SYMBOL(spa_lookup_by_guid
);
2897 EXPORT_SYMBOL(spa_has_spare
);
2898 EXPORT_SYMBOL(dva_get_dsize_sync
);
2899 EXPORT_SYMBOL(bp_get_dsize_sync
);
2900 EXPORT_SYMBOL(bp_get_dsize
);
2901 EXPORT_SYMBOL(spa_has_slogs
);
2902 EXPORT_SYMBOL(spa_is_root
);
2903 EXPORT_SYMBOL(spa_writeable
);
2904 EXPORT_SYMBOL(spa_mode
);
2905 EXPORT_SYMBOL(spa_namespace_lock
);
2906 EXPORT_SYMBOL(spa_trust_config
);
2907 EXPORT_SYMBOL(spa_missing_tvds_allowed
);
2908 EXPORT_SYMBOL(spa_set_missing_tvds
);
2909 EXPORT_SYMBOL(spa_state_to_name
);
2910 EXPORT_SYMBOL(spa_importing_readonly_checkpoint
);
2911 EXPORT_SYMBOL(spa_min_claim_txg
);
2912 EXPORT_SYMBOL(spa_suspend_async_destroy
);
2913 EXPORT_SYMBOL(spa_has_checkpoint
);
2914 EXPORT_SYMBOL(spa_top_vdevs_spacemap_addressable
);
2916 ZFS_MODULE_PARAM(zfs
, zfs_
, flags
, UINT
, ZMOD_RW
,
2917 "Set additional debugging flags");
2919 ZFS_MODULE_PARAM(zfs
, zfs_
, recover
, INT
, ZMOD_RW
,
2920 "Set to attempt to recover from fatal errors");
2922 ZFS_MODULE_PARAM(zfs
, zfs_
, free_leak_on_eio
, INT
, ZMOD_RW
,
2923 "Set to ignore IO errors during free and permanently leak the space");
2925 ZFS_MODULE_PARAM(zfs_deadman
, zfs_deadman_
, checktime_ms
, U64
, ZMOD_RW
,
2926 "Dead I/O check interval in milliseconds");
2928 ZFS_MODULE_PARAM(zfs_deadman
, zfs_deadman_
, enabled
, INT
, ZMOD_RW
,
2929 "Enable deadman timer");
2931 ZFS_MODULE_PARAM(zfs_spa
, spa_
, asize_inflation
, UINT
, ZMOD_RW
,
2932 "SPA size estimate multiplication factor");
2934 ZFS_MODULE_PARAM(zfs
, zfs_
, ddt_data_is_special
, INT
, ZMOD_RW
,
2935 "Place DDT data into the special class");
2937 ZFS_MODULE_PARAM(zfs
, zfs_
, user_indirect_is_special
, INT
, ZMOD_RW
,
2938 "Place user data indirect blocks into the special class");
2941 ZFS_MODULE_PARAM_CALL(zfs_deadman
, zfs_deadman_
, failmode
,
2942 param_set_deadman_failmode
, param_get_charp
, ZMOD_RW
,
2943 "Failmode for deadman timer");
2945 ZFS_MODULE_PARAM_CALL(zfs_deadman
, zfs_deadman_
, synctime_ms
,
2946 param_set_deadman_synctime
, spl_param_get_u64
, ZMOD_RW
,
2947 "Pool sync expiration time in milliseconds");
2949 ZFS_MODULE_PARAM_CALL(zfs_deadman
, zfs_deadman_
, ziotime_ms
,
2950 param_set_deadman_ziotime
, spl_param_get_u64
, ZMOD_RW
,
2951 "IO expiration time in milliseconds");
2953 ZFS_MODULE_PARAM(zfs
, zfs_
, special_class_metadata_reserve_pct
, UINT
, ZMOD_RW
,
2954 "Small file blocks in special vdevs depends on this much "
2955 "free space available");
2958 ZFS_MODULE_PARAM_CALL(zfs_spa
, spa_
, slop_shift
, param_set_slop_shift
,
2959 param_get_uint
, ZMOD_RW
, "Reserved free space in pool");