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) 2017 Datto Inc.
30 #include <sys/zfs_context.h>
31 #include <sys/spa_impl.h>
33 #include <sys/zio_checksum.h>
34 #include <sys/zio_compress.h>
36 #include <sys/dmu_tx.h>
39 #include <sys/vdev_impl.h>
40 #include <sys/vdev_file.h>
41 #include <sys/vdev_raidz.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/fm/util.h>
51 #include <sys/dsl_scan.h>
52 #include <sys/fs/zfs.h>
53 #include <sys/metaslab_impl.h>
56 #include <sys/kstat.h>
58 #include <sys/zfeature.h>
64 * There are four basic locks for managing spa_t structures:
66 * spa_namespace_lock (global mutex)
68 * This lock must be acquired to do any of the following:
70 * - Lookup a spa_t by name
71 * - Add or remove a spa_t from the namespace
72 * - Increase spa_refcount from non-zero
73 * - Check if spa_refcount is zero
75 * - add/remove/attach/detach devices
76 * - Held for the duration of create/destroy/import/export
78 * It does not need to handle recursion. A create or destroy may
79 * reference objects (files or zvols) in other pools, but by
80 * definition they must have an existing reference, and will never need
81 * to lookup a spa_t by name.
83 * spa_refcount (per-spa refcount_t protected by mutex)
85 * This reference count keep track of any active users of the spa_t. The
86 * spa_t cannot be destroyed or freed while this is non-zero. Internally,
87 * the refcount is never really 'zero' - opening a pool implicitly keeps
88 * some references in the DMU. Internally we check against spa_minref, but
89 * present the image of a zero/non-zero value to consumers.
91 * spa_config_lock[] (per-spa array of rwlocks)
93 * This protects the spa_t from config changes, and must be held in
94 * the following circumstances:
96 * - RW_READER to perform I/O to the spa
97 * - RW_WRITER to change the vdev config
99 * The locking order is fairly straightforward:
101 * spa_namespace_lock -> spa_refcount
103 * The namespace lock must be acquired to increase the refcount from 0
104 * or to check if it is zero.
106 * spa_refcount -> spa_config_lock[]
108 * There must be at least one valid reference on the spa_t to acquire
111 * spa_namespace_lock -> spa_config_lock[]
113 * The namespace lock must always be taken before the config lock.
116 * The spa_namespace_lock can be acquired directly and is globally visible.
118 * The namespace is manipulated using the following functions, all of which
119 * require the spa_namespace_lock to be held.
121 * spa_lookup() Lookup a spa_t by name.
123 * spa_add() Create a new spa_t in the namespace.
125 * spa_remove() Remove a spa_t from the namespace. This also
126 * frees up any memory associated with the spa_t.
128 * spa_next() Returns the next spa_t in the system, or the
129 * first if NULL is passed.
131 * spa_evict_all() Shutdown and remove all spa_t structures in
134 * spa_guid_exists() Determine whether a pool/device guid exists.
136 * The spa_refcount is manipulated using the following functions:
138 * spa_open_ref() Adds a reference to the given spa_t. Must be
139 * called with spa_namespace_lock held if the
140 * refcount is currently zero.
142 * spa_close() Remove a reference from the spa_t. This will
143 * not free the spa_t or remove it from the
144 * namespace. No locking is required.
146 * spa_refcount_zero() Returns true if the refcount is currently
147 * zero. Must be called with spa_namespace_lock
150 * The spa_config_lock[] is an array of rwlocks, ordered as follows:
151 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
152 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
154 * To read the configuration, it suffices to hold one of these locks as reader.
155 * To modify the configuration, you must hold all locks as writer. To modify
156 * vdev state without altering the vdev tree's topology (e.g. online/offline),
157 * you must hold SCL_STATE and SCL_ZIO as writer.
159 * We use these distinct config locks to avoid recursive lock entry.
160 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
161 * block allocations (SCL_ALLOC), which may require reading space maps
162 * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
164 * The spa config locks cannot be normal rwlocks because we need the
165 * ability to hand off ownership. For example, SCL_ZIO is acquired
166 * by the issuing thread and later released by an interrupt thread.
167 * They do, however, obey the usual write-wanted semantics to prevent
168 * writer (i.e. system administrator) starvation.
170 * The lock acquisition rules are as follows:
173 * Protects changes to the vdev tree topology, such as vdev
174 * add/remove/attach/detach. Protects the dirty config list
175 * (spa_config_dirty_list) and the set of spares and l2arc devices.
178 * Protects changes to pool state and vdev state, such as vdev
179 * online/offline/fault/degrade/clear. Protects the dirty state list
180 * (spa_state_dirty_list) and global pool state (spa_state).
183 * Protects changes to metaslab groups and classes.
184 * Held as reader by metaslab_alloc() and metaslab_claim().
187 * Held by bp-level zios (those which have no io_vd upon entry)
188 * to prevent changes to the vdev tree. The bp-level zio implicitly
189 * protects all of its vdev child zios, which do not hold SCL_ZIO.
192 * Protects changes to metaslab groups and classes.
193 * Held as reader by metaslab_free(). SCL_FREE is distinct from
194 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
195 * blocks in zio_done() while another i/o that holds either
196 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
199 * Held as reader to prevent changes to the vdev tree during trivial
200 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
201 * other locks, and lower than all of them, to ensure that it's safe
202 * to acquire regardless of caller context.
204 * In addition, the following rules apply:
206 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
207 * The lock ordering is SCL_CONFIG > spa_props_lock.
209 * (b) I/O operations on leaf vdevs. For any zio operation that takes
210 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
211 * or zio_write_phys() -- the caller must ensure that the config cannot
212 * cannot change in the interim, and that the vdev cannot be reopened.
213 * SCL_STATE as reader suffices for both.
215 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
217 * spa_vdev_enter() Acquire the namespace lock and the config lock
220 * spa_vdev_exit() Release the config lock, wait for all I/O
221 * to complete, sync the updated configs to the
222 * cache, and release the namespace lock.
224 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
225 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
226 * locking is, always, based on spa_namespace_lock and spa_config_lock[].
228 * spa_rename() is also implemented within this file since it requires
229 * manipulation of the namespace.
232 static avl_tree_t spa_namespace_avl
;
233 kmutex_t spa_namespace_lock
;
234 static kcondvar_t spa_namespace_cv
;
235 int spa_max_replication_override
= SPA_DVAS_PER_BP
;
237 static kmutex_t spa_spare_lock
;
238 static avl_tree_t spa_spare_avl
;
239 static kmutex_t spa_l2cache_lock
;
240 static avl_tree_t spa_l2cache_avl
;
242 kmem_cache_t
*spa_buffer_pool
;
246 /* Everything except dprintf and spa is on by default in debug builds */
247 int zfs_flags
= ~(ZFS_DEBUG_DPRINTF
| ZFS_DEBUG_SPA
);
253 * zfs_recover can be set to nonzero to attempt to recover from
254 * otherwise-fatal errors, typically caused by on-disk corruption. When
255 * set, calls to zfs_panic_recover() will turn into warning messages.
256 * This should only be used as a last resort, as it typically results
257 * in leaked space, or worse.
259 int zfs_recover
= B_FALSE
;
262 * If destroy encounters an EIO while reading metadata (e.g. indirect
263 * blocks), space referenced by the missing metadata can not be freed.
264 * Normally this causes the background destroy to become "stalled", as
265 * it is unable to make forward progress. While in this stalled state,
266 * all remaining space to free from the error-encountering filesystem is
267 * "temporarily leaked". Set this flag to cause it to ignore the EIO,
268 * permanently leak the space from indirect blocks that can not be read,
269 * and continue to free everything else that it can.
271 * The default, "stalling" behavior is useful if the storage partially
272 * fails (i.e. some but not all i/os fail), and then later recovers. In
273 * this case, we will be able to continue pool operations while it is
274 * partially failed, and when it recovers, we can continue to free the
275 * space, with no leaks. However, note that this case is actually
278 * Typically pools either (a) fail completely (but perhaps temporarily,
279 * e.g. a top-level vdev going offline), or (b) have localized,
280 * permanent errors (e.g. disk returns the wrong data due to bit flip or
281 * firmware bug). In case (a), this setting does not matter because the
282 * pool will be suspended and the sync thread will not be able to make
283 * forward progress regardless. In case (b), because the error is
284 * permanent, the best we can do is leak the minimum amount of space,
285 * which is what setting this flag will do. Therefore, it is reasonable
286 * for this flag to normally be set, but we chose the more conservative
287 * approach of not setting it, so that there is no possibility of
288 * leaking space in the "partial temporary" failure case.
290 int zfs_free_leak_on_eio
= B_FALSE
;
293 * Expiration time in milliseconds. This value has two meanings. First it is
294 * used to determine when the spa_deadman() logic should fire. By default the
295 * spa_deadman() will fire if spa_sync() has not completed in 600 seconds.
296 * Secondly, the value determines if an I/O is considered "hung". Any I/O that
297 * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting
298 * in one of three behaviors controlled by zfs_deadman_failmode.
300 unsigned long zfs_deadman_synctime_ms
= 600000ULL;
303 * This value controls the maximum amount of time zio_wait() will block for an
304 * outstanding IO. By default this is 300 seconds at which point the "hung"
305 * behavior will be applied as described for zfs_deadman_synctime_ms.
307 unsigned long zfs_deadman_ziotime_ms
= 300000ULL;
310 * Check time in milliseconds. This defines the frequency at which we check
313 unsigned long zfs_deadman_checktime_ms
= 60000ULL;
316 * By default the deadman is enabled.
318 int zfs_deadman_enabled
= 1;
321 * Controls the behavior of the deadman when it detects a "hung" I/O.
322 * Valid values are zfs_deadman_failmode=<wait|continue|panic>.
324 * wait - Wait for the "hung" I/O (default)
325 * continue - Attempt to recover from a "hung" I/O
326 * panic - Panic the system
328 char *zfs_deadman_failmode
= "wait";
331 * The worst case is single-sector max-parity RAID-Z blocks, in which
332 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
333 * times the size; so just assume that. Add to this the fact that
334 * we can have up to 3 DVAs per bp, and one more factor of 2 because
335 * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together,
337 * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
339 int spa_asize_inflation
= 24;
342 * Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in
343 * the pool to be consumed. This ensures that we don't run the pool
344 * completely out of space, due to unaccounted changes (e.g. to the MOS).
345 * It also limits the worst-case time to allocate space. If we have
346 * less than this amount of free space, most ZPL operations (e.g. write,
347 * create) will return ENOSPC.
349 * Certain operations (e.g. file removal, most administrative actions) can
350 * use half the slop space. They will only return ENOSPC if less than half
351 * the slop space is free. Typically, once the pool has less than the slop
352 * space free, the user will use these operations to free up space in the pool.
353 * These are the operations that call dsl_pool_adjustedsize() with the netfree
354 * argument set to TRUE.
356 * A very restricted set of operations are always permitted, regardless of
357 * the amount of free space. These are the operations that call
358 * dsl_sync_task(ZFS_SPACE_CHECK_NONE), e.g. "zfs destroy". If these
359 * operations result in a net increase in the amount of space used,
360 * it is possible to run the pool completely out of space, causing it to
361 * be permanently read-only.
363 * Note that on very small pools, the slop space will be larger than
364 * 3.2%, in an effort to have it be at least spa_min_slop (128MB),
365 * but we never allow it to be more than half the pool size.
367 * See also the comments in zfs_space_check_t.
369 int spa_slop_shift
= 5;
370 uint64_t spa_min_slop
= 128 * 1024 * 1024;
373 * ==========================================================================
375 * ==========================================================================
378 spa_config_lock_init(spa_t
*spa
)
380 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
381 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
382 mutex_init(&scl
->scl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
383 cv_init(&scl
->scl_cv
, NULL
, CV_DEFAULT
, NULL
);
384 refcount_create_untracked(&scl
->scl_count
);
385 scl
->scl_writer
= NULL
;
386 scl
->scl_write_wanted
= 0;
391 spa_config_lock_destroy(spa_t
*spa
)
393 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
394 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
395 mutex_destroy(&scl
->scl_lock
);
396 cv_destroy(&scl
->scl_cv
);
397 refcount_destroy(&scl
->scl_count
);
398 ASSERT(scl
->scl_writer
== NULL
);
399 ASSERT(scl
->scl_write_wanted
== 0);
404 spa_config_tryenter(spa_t
*spa
, int locks
, void *tag
, krw_t rw
)
406 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
407 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
408 if (!(locks
& (1 << i
)))
410 mutex_enter(&scl
->scl_lock
);
411 if (rw
== RW_READER
) {
412 if (scl
->scl_writer
|| scl
->scl_write_wanted
) {
413 mutex_exit(&scl
->scl_lock
);
414 spa_config_exit(spa
, locks
& ((1 << i
) - 1),
419 ASSERT(scl
->scl_writer
!= curthread
);
420 if (!refcount_is_zero(&scl
->scl_count
)) {
421 mutex_exit(&scl
->scl_lock
);
422 spa_config_exit(spa
, locks
& ((1 << i
) - 1),
426 scl
->scl_writer
= curthread
;
428 (void) refcount_add(&scl
->scl_count
, tag
);
429 mutex_exit(&scl
->scl_lock
);
435 spa_config_enter(spa_t
*spa
, int locks
, void *tag
, krw_t rw
)
439 ASSERT3U(SCL_LOCKS
, <, sizeof (wlocks_held
) * NBBY
);
441 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
442 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
443 if (scl
->scl_writer
== curthread
)
444 wlocks_held
|= (1 << i
);
445 if (!(locks
& (1 << i
)))
447 mutex_enter(&scl
->scl_lock
);
448 if (rw
== RW_READER
) {
449 while (scl
->scl_writer
|| scl
->scl_write_wanted
) {
450 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
453 ASSERT(scl
->scl_writer
!= curthread
);
454 while (!refcount_is_zero(&scl
->scl_count
)) {
455 scl
->scl_write_wanted
++;
456 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
457 scl
->scl_write_wanted
--;
459 scl
->scl_writer
= curthread
;
461 (void) refcount_add(&scl
->scl_count
, tag
);
462 mutex_exit(&scl
->scl_lock
);
464 ASSERT(wlocks_held
<= locks
);
468 spa_config_exit(spa_t
*spa
, int locks
, void *tag
)
470 for (int i
= SCL_LOCKS
- 1; i
>= 0; i
--) {
471 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
472 if (!(locks
& (1 << i
)))
474 mutex_enter(&scl
->scl_lock
);
475 ASSERT(!refcount_is_zero(&scl
->scl_count
));
476 if (refcount_remove(&scl
->scl_count
, tag
) == 0) {
477 ASSERT(scl
->scl_writer
== NULL
||
478 scl
->scl_writer
== curthread
);
479 scl
->scl_writer
= NULL
; /* OK in either case */
480 cv_broadcast(&scl
->scl_cv
);
482 mutex_exit(&scl
->scl_lock
);
487 spa_config_held(spa_t
*spa
, int locks
, krw_t rw
)
491 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
492 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
493 if (!(locks
& (1 << i
)))
495 if ((rw
== RW_READER
&& !refcount_is_zero(&scl
->scl_count
)) ||
496 (rw
== RW_WRITER
&& scl
->scl_writer
== curthread
))
497 locks_held
|= 1 << i
;
504 * ==========================================================================
505 * SPA namespace functions
506 * ==========================================================================
510 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
511 * Returns NULL if no matching spa_t is found.
514 spa_lookup(const char *name
)
516 static spa_t search
; /* spa_t is large; don't allocate on stack */
521 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
523 (void) strlcpy(search
.spa_name
, name
, sizeof (search
.spa_name
));
526 * If it's a full dataset name, figure out the pool name and
529 cp
= strpbrk(search
.spa_name
, "/@#");
533 spa
= avl_find(&spa_namespace_avl
, &search
, &where
);
539 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
540 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues
541 * looking for potentially hung I/Os.
544 spa_deadman(void *arg
)
548 /* Disable the deadman if the pool is suspended. */
549 if (spa_suspended(spa
))
552 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
553 (gethrtime() - spa
->spa_sync_starttime
) / NANOSEC
,
554 ++spa
->spa_deadman_calls
);
555 if (zfs_deadman_enabled
)
556 vdev_deadman(spa
->spa_root_vdev
, FTAG
);
558 spa
->spa_deadman_tqid
= taskq_dispatch_delay(system_delay_taskq
,
559 spa_deadman
, spa
, TQ_SLEEP
, ddi_get_lbolt() +
560 MSEC_TO_TICK(zfs_deadman_checktime_ms
));
564 * Create an uninitialized spa_t with the given name. Requires
565 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
566 * exist by calling spa_lookup() first.
569 spa_add(const char *name
, nvlist_t
*config
, const char *altroot
)
572 spa_config_dirent_t
*dp
;
574 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
576 spa
= kmem_zalloc(sizeof (spa_t
), KM_SLEEP
);
578 mutex_init(&spa
->spa_async_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
579 mutex_init(&spa
->spa_errlist_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
580 mutex_init(&spa
->spa_errlog_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
581 mutex_init(&spa
->spa_evicting_os_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
582 mutex_init(&spa
->spa_history_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
583 mutex_init(&spa
->spa_proc_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
584 mutex_init(&spa
->spa_props_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
585 mutex_init(&spa
->spa_cksum_tmpls_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
586 mutex_init(&spa
->spa_scrub_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
587 mutex_init(&spa
->spa_suspend_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
588 mutex_init(&spa
->spa_vdev_top_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
589 mutex_init(&spa
->spa_feat_stats_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
590 mutex_init(&spa
->spa_alloc_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
592 cv_init(&spa
->spa_async_cv
, NULL
, CV_DEFAULT
, NULL
);
593 cv_init(&spa
->spa_evicting_os_cv
, NULL
, CV_DEFAULT
, NULL
);
594 cv_init(&spa
->spa_proc_cv
, NULL
, CV_DEFAULT
, NULL
);
595 cv_init(&spa
->spa_scrub_io_cv
, NULL
, CV_DEFAULT
, NULL
);
596 cv_init(&spa
->spa_suspend_cv
, NULL
, CV_DEFAULT
, NULL
);
598 for (int t
= 0; t
< TXG_SIZE
; t
++)
599 bplist_create(&spa
->spa_free_bplist
[t
]);
601 (void) strlcpy(spa
->spa_name
, name
, sizeof (spa
->spa_name
));
602 spa
->spa_state
= POOL_STATE_UNINITIALIZED
;
603 spa
->spa_freeze_txg
= UINT64_MAX
;
604 spa
->spa_final_txg
= UINT64_MAX
;
605 spa
->spa_load_max_txg
= UINT64_MAX
;
607 spa
->spa_proc_state
= SPA_PROC_NONE
;
609 spa
->spa_deadman_synctime
= MSEC2NSEC(zfs_deadman_synctime_ms
);
610 spa
->spa_deadman_ziotime
= MSEC2NSEC(zfs_deadman_ziotime_ms
);
611 spa_set_deadman_failmode(spa
, zfs_deadman_failmode
);
613 refcount_create(&spa
->spa_refcount
);
614 spa_config_lock_init(spa
);
617 avl_add(&spa_namespace_avl
, spa
);
620 * Set the alternate root, if there is one.
623 spa
->spa_root
= spa_strdup(altroot
);
625 avl_create(&spa
->spa_alloc_tree
, zio_bookmark_compare
,
626 sizeof (zio_t
), offsetof(zio_t
, io_alloc_node
));
629 * Every pool starts with the default cachefile
631 list_create(&spa
->spa_config_list
, sizeof (spa_config_dirent_t
),
632 offsetof(spa_config_dirent_t
, scd_link
));
634 dp
= kmem_zalloc(sizeof (spa_config_dirent_t
), KM_SLEEP
);
635 dp
->scd_path
= altroot
? NULL
: spa_strdup(spa_config_path
);
636 list_insert_head(&spa
->spa_config_list
, dp
);
638 VERIFY(nvlist_alloc(&spa
->spa_load_info
, NV_UNIQUE_NAME
,
641 if (config
!= NULL
) {
644 if (nvlist_lookup_nvlist(config
, ZPOOL_CONFIG_FEATURES_FOR_READ
,
646 VERIFY(nvlist_dup(features
, &spa
->spa_label_features
,
650 VERIFY(nvlist_dup(config
, &spa
->spa_config
, 0) == 0);
653 if (spa
->spa_label_features
== NULL
) {
654 VERIFY(nvlist_alloc(&spa
->spa_label_features
, NV_UNIQUE_NAME
,
658 spa
->spa_debug
= ((zfs_flags
& ZFS_DEBUG_SPA
) != 0);
660 spa
->spa_min_ashift
= INT_MAX
;
661 spa
->spa_max_ashift
= 0;
663 /* Reset cached value */
664 spa
->spa_dedup_dspace
= ~0ULL;
667 * As a pool is being created, treat all features as disabled by
668 * setting SPA_FEATURE_DISABLED for all entries in the feature
671 for (int i
= 0; i
< SPA_FEATURES
; i
++) {
672 spa
->spa_feat_refcount_cache
[i
] = SPA_FEATURE_DISABLED
;
679 * Removes a spa_t from the namespace, freeing up any memory used. Requires
680 * spa_namespace_lock. This is called only after the spa_t has been closed and
684 spa_remove(spa_t
*spa
)
686 spa_config_dirent_t
*dp
;
688 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
689 ASSERT(spa
->spa_state
== POOL_STATE_UNINITIALIZED
);
690 ASSERT3U(refcount_count(&spa
->spa_refcount
), ==, 0);
692 nvlist_free(spa
->spa_config_splitting
);
694 avl_remove(&spa_namespace_avl
, spa
);
695 cv_broadcast(&spa_namespace_cv
);
698 spa_strfree(spa
->spa_root
);
700 while ((dp
= list_head(&spa
->spa_config_list
)) != NULL
) {
701 list_remove(&spa
->spa_config_list
, dp
);
702 if (dp
->scd_path
!= NULL
)
703 spa_strfree(dp
->scd_path
);
704 kmem_free(dp
, sizeof (spa_config_dirent_t
));
707 avl_destroy(&spa
->spa_alloc_tree
);
708 list_destroy(&spa
->spa_config_list
);
710 nvlist_free(spa
->spa_label_features
);
711 nvlist_free(spa
->spa_load_info
);
712 nvlist_free(spa
->spa_feat_stats
);
713 spa_config_set(spa
, NULL
);
715 refcount_destroy(&spa
->spa_refcount
);
717 spa_stats_destroy(spa
);
718 spa_config_lock_destroy(spa
);
720 for (int t
= 0; t
< TXG_SIZE
; t
++)
721 bplist_destroy(&spa
->spa_free_bplist
[t
]);
723 zio_checksum_templates_free(spa
);
725 cv_destroy(&spa
->spa_async_cv
);
726 cv_destroy(&spa
->spa_evicting_os_cv
);
727 cv_destroy(&spa
->spa_proc_cv
);
728 cv_destroy(&spa
->spa_scrub_io_cv
);
729 cv_destroy(&spa
->spa_suspend_cv
);
731 mutex_destroy(&spa
->spa_alloc_lock
);
732 mutex_destroy(&spa
->spa_async_lock
);
733 mutex_destroy(&spa
->spa_errlist_lock
);
734 mutex_destroy(&spa
->spa_errlog_lock
);
735 mutex_destroy(&spa
->spa_evicting_os_lock
);
736 mutex_destroy(&spa
->spa_history_lock
);
737 mutex_destroy(&spa
->spa_proc_lock
);
738 mutex_destroy(&spa
->spa_props_lock
);
739 mutex_destroy(&spa
->spa_cksum_tmpls_lock
);
740 mutex_destroy(&spa
->spa_scrub_lock
);
741 mutex_destroy(&spa
->spa_suspend_lock
);
742 mutex_destroy(&spa
->spa_vdev_top_lock
);
743 mutex_destroy(&spa
->spa_feat_stats_lock
);
745 kmem_free(spa
, sizeof (spa_t
));
749 * Given a pool, return the next pool in the namespace, or NULL if there is
750 * none. If 'prev' is NULL, return the first pool.
753 spa_next(spa_t
*prev
)
755 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
758 return (AVL_NEXT(&spa_namespace_avl
, prev
));
760 return (avl_first(&spa_namespace_avl
));
764 * ==========================================================================
765 * SPA refcount functions
766 * ==========================================================================
770 * Add a reference to the given spa_t. Must have at least one reference, or
771 * have the namespace lock held.
774 spa_open_ref(spa_t
*spa
, void *tag
)
776 ASSERT(refcount_count(&spa
->spa_refcount
) >= spa
->spa_minref
||
777 MUTEX_HELD(&spa_namespace_lock
));
778 (void) refcount_add(&spa
->spa_refcount
, tag
);
782 * Remove a reference to the given spa_t. Must have at least one reference, or
783 * have the namespace lock held.
786 spa_close(spa_t
*spa
, void *tag
)
788 ASSERT(refcount_count(&spa
->spa_refcount
) > spa
->spa_minref
||
789 MUTEX_HELD(&spa_namespace_lock
));
790 (void) refcount_remove(&spa
->spa_refcount
, tag
);
794 * Remove a reference to the given spa_t held by a dsl dir that is
795 * being asynchronously released. Async releases occur from a taskq
796 * performing eviction of dsl datasets and dirs. The namespace lock
797 * isn't held and the hold by the object being evicted may contribute to
798 * spa_minref (e.g. dataset or directory released during pool export),
799 * so the asserts in spa_close() do not apply.
802 spa_async_close(spa_t
*spa
, void *tag
)
804 (void) refcount_remove(&spa
->spa_refcount
, tag
);
808 * Check to see if the spa refcount is zero. Must be called with
809 * spa_namespace_lock held. We really compare against spa_minref, which is the
810 * number of references acquired when opening a pool
813 spa_refcount_zero(spa_t
*spa
)
815 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
817 return (refcount_count(&spa
->spa_refcount
) == spa
->spa_minref
);
821 * ==========================================================================
822 * SPA spare and l2cache tracking
823 * ==========================================================================
827 * Hot spares and cache devices are tracked using the same code below,
828 * for 'auxiliary' devices.
831 typedef struct spa_aux
{
839 spa_aux_compare(const void *a
, const void *b
)
841 const spa_aux_t
*sa
= (const spa_aux_t
*)a
;
842 const spa_aux_t
*sb
= (const spa_aux_t
*)b
;
844 return (AVL_CMP(sa
->aux_guid
, sb
->aux_guid
));
848 spa_aux_add(vdev_t
*vd
, avl_tree_t
*avl
)
854 search
.aux_guid
= vd
->vdev_guid
;
855 if ((aux
= avl_find(avl
, &search
, &where
)) != NULL
) {
858 aux
= kmem_zalloc(sizeof (spa_aux_t
), KM_SLEEP
);
859 aux
->aux_guid
= vd
->vdev_guid
;
861 avl_insert(avl
, aux
, where
);
866 spa_aux_remove(vdev_t
*vd
, avl_tree_t
*avl
)
872 search
.aux_guid
= vd
->vdev_guid
;
873 aux
= avl_find(avl
, &search
, &where
);
877 if (--aux
->aux_count
== 0) {
878 avl_remove(avl
, aux
);
879 kmem_free(aux
, sizeof (spa_aux_t
));
880 } else if (aux
->aux_pool
== spa_guid(vd
->vdev_spa
)) {
881 aux
->aux_pool
= 0ULL;
886 spa_aux_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
, avl_tree_t
*avl
)
888 spa_aux_t search
, *found
;
890 search
.aux_guid
= guid
;
891 found
= avl_find(avl
, &search
, NULL
);
895 *pool
= found
->aux_pool
;
902 *refcnt
= found
->aux_count
;
907 return (found
!= NULL
);
911 spa_aux_activate(vdev_t
*vd
, avl_tree_t
*avl
)
913 spa_aux_t search
, *found
;
916 search
.aux_guid
= vd
->vdev_guid
;
917 found
= avl_find(avl
, &search
, &where
);
918 ASSERT(found
!= NULL
);
919 ASSERT(found
->aux_pool
== 0ULL);
921 found
->aux_pool
= spa_guid(vd
->vdev_spa
);
925 * Spares are tracked globally due to the following constraints:
927 * - A spare may be part of multiple pools.
928 * - A spare may be added to a pool even if it's actively in use within
930 * - A spare in use in any pool can only be the source of a replacement if
931 * the target is a spare in the same pool.
933 * We keep track of all spares on the system through the use of a reference
934 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
935 * spare, then we bump the reference count in the AVL tree. In addition, we set
936 * the 'vdev_isspare' member to indicate that the device is a spare (active or
937 * inactive). When a spare is made active (used to replace a device in the
938 * pool), we also keep track of which pool its been made a part of.
940 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
941 * called under the spa_namespace lock as part of vdev reconfiguration. The
942 * separate spare lock exists for the status query path, which does not need to
943 * be completely consistent with respect to other vdev configuration changes.
947 spa_spare_compare(const void *a
, const void *b
)
949 return (spa_aux_compare(a
, b
));
953 spa_spare_add(vdev_t
*vd
)
955 mutex_enter(&spa_spare_lock
);
956 ASSERT(!vd
->vdev_isspare
);
957 spa_aux_add(vd
, &spa_spare_avl
);
958 vd
->vdev_isspare
= B_TRUE
;
959 mutex_exit(&spa_spare_lock
);
963 spa_spare_remove(vdev_t
*vd
)
965 mutex_enter(&spa_spare_lock
);
966 ASSERT(vd
->vdev_isspare
);
967 spa_aux_remove(vd
, &spa_spare_avl
);
968 vd
->vdev_isspare
= B_FALSE
;
969 mutex_exit(&spa_spare_lock
);
973 spa_spare_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
)
977 mutex_enter(&spa_spare_lock
);
978 found
= spa_aux_exists(guid
, pool
, refcnt
, &spa_spare_avl
);
979 mutex_exit(&spa_spare_lock
);
985 spa_spare_activate(vdev_t
*vd
)
987 mutex_enter(&spa_spare_lock
);
988 ASSERT(vd
->vdev_isspare
);
989 spa_aux_activate(vd
, &spa_spare_avl
);
990 mutex_exit(&spa_spare_lock
);
994 * Level 2 ARC devices are tracked globally for the same reasons as spares.
995 * Cache devices currently only support one pool per cache device, and so
996 * for these devices the aux reference count is currently unused beyond 1.
1000 spa_l2cache_compare(const void *a
, const void *b
)
1002 return (spa_aux_compare(a
, b
));
1006 spa_l2cache_add(vdev_t
*vd
)
1008 mutex_enter(&spa_l2cache_lock
);
1009 ASSERT(!vd
->vdev_isl2cache
);
1010 spa_aux_add(vd
, &spa_l2cache_avl
);
1011 vd
->vdev_isl2cache
= B_TRUE
;
1012 mutex_exit(&spa_l2cache_lock
);
1016 spa_l2cache_remove(vdev_t
*vd
)
1018 mutex_enter(&spa_l2cache_lock
);
1019 ASSERT(vd
->vdev_isl2cache
);
1020 spa_aux_remove(vd
, &spa_l2cache_avl
);
1021 vd
->vdev_isl2cache
= B_FALSE
;
1022 mutex_exit(&spa_l2cache_lock
);
1026 spa_l2cache_exists(uint64_t guid
, uint64_t *pool
)
1030 mutex_enter(&spa_l2cache_lock
);
1031 found
= spa_aux_exists(guid
, pool
, NULL
, &spa_l2cache_avl
);
1032 mutex_exit(&spa_l2cache_lock
);
1038 spa_l2cache_activate(vdev_t
*vd
)
1040 mutex_enter(&spa_l2cache_lock
);
1041 ASSERT(vd
->vdev_isl2cache
);
1042 spa_aux_activate(vd
, &spa_l2cache_avl
);
1043 mutex_exit(&spa_l2cache_lock
);
1047 * ==========================================================================
1049 * ==========================================================================
1053 * Lock the given spa_t for the purpose of adding or removing a vdev.
1054 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
1055 * It returns the next transaction group for the spa_t.
1058 spa_vdev_enter(spa_t
*spa
)
1060 mutex_enter(&spa
->spa_vdev_top_lock
);
1061 mutex_enter(&spa_namespace_lock
);
1062 return (spa_vdev_config_enter(spa
));
1066 * Internal implementation for spa_vdev_enter(). Used when a vdev
1067 * operation requires multiple syncs (i.e. removing a device) while
1068 * keeping the spa_namespace_lock held.
1071 spa_vdev_config_enter(spa_t
*spa
)
1073 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1075 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1077 return (spa_last_synced_txg(spa
) + 1);
1081 * Used in combination with spa_vdev_config_enter() to allow the syncing
1082 * of multiple transactions without releasing the spa_namespace_lock.
1085 spa_vdev_config_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
, char *tag
)
1087 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1089 int config_changed
= B_FALSE
;
1091 ASSERT(txg
> spa_last_synced_txg(spa
));
1093 spa
->spa_pending_vdev
= NULL
;
1096 * Reassess the DTLs.
1098 vdev_dtl_reassess(spa
->spa_root_vdev
, 0, 0, B_FALSE
);
1100 if (error
== 0 && !list_is_empty(&spa
->spa_config_dirty_list
)) {
1101 config_changed
= B_TRUE
;
1102 spa
->spa_config_generation
++;
1106 * Verify the metaslab classes.
1108 ASSERT(metaslab_class_validate(spa_normal_class(spa
)) == 0);
1109 ASSERT(metaslab_class_validate(spa_log_class(spa
)) == 0);
1111 spa_config_exit(spa
, SCL_ALL
, spa
);
1114 * Panic the system if the specified tag requires it. This
1115 * is useful for ensuring that configurations are updated
1118 if (zio_injection_enabled
)
1119 zio_handle_panic_injection(spa
, tag
, 0);
1122 * Note: this txg_wait_synced() is important because it ensures
1123 * that there won't be more than one config change per txg.
1124 * This allows us to use the txg as the generation number.
1127 txg_wait_synced(spa
->spa_dsl_pool
, txg
);
1130 ASSERT(!vd
->vdev_detached
|| vd
->vdev_dtl_sm
== NULL
);
1131 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1133 spa_config_exit(spa
, SCL_ALL
, spa
);
1137 * If the config changed, update the config cache.
1140 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1144 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
1145 * locking of spa_vdev_enter(), we also want make sure the transactions have
1146 * synced to disk, and then update the global configuration cache with the new
1150 spa_vdev_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
)
1152 spa_vdev_config_exit(spa
, vd
, txg
, error
, FTAG
);
1153 mutex_exit(&spa_namespace_lock
);
1154 mutex_exit(&spa
->spa_vdev_top_lock
);
1160 * Lock the given spa_t for the purpose of changing vdev state.
1163 spa_vdev_state_enter(spa_t
*spa
, int oplocks
)
1165 int locks
= SCL_STATE_ALL
| oplocks
;
1168 * Root pools may need to read of the underlying devfs filesystem
1169 * when opening up a vdev. Unfortunately if we're holding the
1170 * SCL_ZIO lock it will result in a deadlock when we try to issue
1171 * the read from the root filesystem. Instead we "prefetch"
1172 * the associated vnodes that we need prior to opening the
1173 * underlying devices and cache them so that we can prevent
1174 * any I/O when we are doing the actual open.
1176 if (spa_is_root(spa
)) {
1177 int low
= locks
& ~(SCL_ZIO
- 1);
1178 int high
= locks
& ~low
;
1180 spa_config_enter(spa
, high
, spa
, RW_WRITER
);
1181 vdev_hold(spa
->spa_root_vdev
);
1182 spa_config_enter(spa
, low
, spa
, RW_WRITER
);
1184 spa_config_enter(spa
, locks
, spa
, RW_WRITER
);
1186 spa
->spa_vdev_locks
= locks
;
1190 spa_vdev_state_exit(spa_t
*spa
, vdev_t
*vd
, int error
)
1192 boolean_t config_changed
= B_FALSE
;
1195 if (vd
== NULL
|| vd
== spa
->spa_root_vdev
) {
1196 vdev_top
= spa
->spa_root_vdev
;
1198 vdev_top
= vd
->vdev_top
;
1201 if (vd
!= NULL
|| error
== 0)
1202 vdev_dtl_reassess(vdev_top
, 0, 0, B_FALSE
);
1205 if (vd
!= spa
->spa_root_vdev
)
1206 vdev_state_dirty(vdev_top
);
1208 config_changed
= B_TRUE
;
1209 spa
->spa_config_generation
++;
1212 if (spa_is_root(spa
))
1213 vdev_rele(spa
->spa_root_vdev
);
1215 ASSERT3U(spa
->spa_vdev_locks
, >=, SCL_STATE_ALL
);
1216 spa_config_exit(spa
, spa
->spa_vdev_locks
, spa
);
1219 * If anything changed, wait for it to sync. This ensures that,
1220 * from the system administrator's perspective, zpool(1M) commands
1221 * are synchronous. This is important for things like zpool offline:
1222 * when the command completes, you expect no further I/O from ZFS.
1225 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1228 * If the config changed, update the config cache.
1230 if (config_changed
) {
1231 mutex_enter(&spa_namespace_lock
);
1232 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1233 mutex_exit(&spa_namespace_lock
);
1240 * ==========================================================================
1241 * Miscellaneous functions
1242 * ==========================================================================
1246 spa_activate_mos_feature(spa_t
*spa
, const char *feature
, dmu_tx_t
*tx
)
1248 if (!nvlist_exists(spa
->spa_label_features
, feature
)) {
1249 fnvlist_add_boolean(spa
->spa_label_features
, feature
);
1251 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't
1252 * dirty the vdev config because lock SCL_CONFIG is not held.
1253 * Thankfully, in this case we don't need to dirty the config
1254 * because it will be written out anyway when we finish
1255 * creating the pool.
1257 if (tx
->tx_txg
!= TXG_INITIAL
)
1258 vdev_config_dirty(spa
->spa_root_vdev
);
1263 spa_deactivate_mos_feature(spa_t
*spa
, const char *feature
)
1265 if (nvlist_remove_all(spa
->spa_label_features
, feature
) == 0)
1266 vdev_config_dirty(spa
->spa_root_vdev
);
1273 spa_rename(const char *name
, const char *newname
)
1279 * Lookup the spa_t and grab the config lock for writing. We need to
1280 * actually open the pool so that we can sync out the necessary labels.
1281 * It's OK to call spa_open() with the namespace lock held because we
1282 * allow recursive calls for other reasons.
1284 mutex_enter(&spa_namespace_lock
);
1285 if ((err
= spa_open(name
, &spa
, FTAG
)) != 0) {
1286 mutex_exit(&spa_namespace_lock
);
1290 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1292 avl_remove(&spa_namespace_avl
, spa
);
1293 (void) strlcpy(spa
->spa_name
, newname
, sizeof (spa
->spa_name
));
1294 avl_add(&spa_namespace_avl
, spa
);
1297 * Sync all labels to disk with the new names by marking the root vdev
1298 * dirty and waiting for it to sync. It will pick up the new pool name
1301 vdev_config_dirty(spa
->spa_root_vdev
);
1303 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1305 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1308 * Sync the updated config cache.
1310 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1312 spa_close(spa
, FTAG
);
1314 mutex_exit(&spa_namespace_lock
);
1320 * Return the spa_t associated with given pool_guid, if it exists. If
1321 * device_guid is non-zero, determine whether the pool exists *and* contains
1322 * a device with the specified device_guid.
1325 spa_by_guid(uint64_t pool_guid
, uint64_t device_guid
)
1328 avl_tree_t
*t
= &spa_namespace_avl
;
1330 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1332 for (spa
= avl_first(t
); spa
!= NULL
; spa
= AVL_NEXT(t
, spa
)) {
1333 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1335 if (spa
->spa_root_vdev
== NULL
)
1337 if (spa_guid(spa
) == pool_guid
) {
1338 if (device_guid
== 0)
1341 if (vdev_lookup_by_guid(spa
->spa_root_vdev
,
1342 device_guid
) != NULL
)
1346 * Check any devices we may be in the process of adding.
1348 if (spa
->spa_pending_vdev
) {
1349 if (vdev_lookup_by_guid(spa
->spa_pending_vdev
,
1350 device_guid
) != NULL
)
1360 * Determine whether a pool with the given pool_guid exists.
1363 spa_guid_exists(uint64_t pool_guid
, uint64_t device_guid
)
1365 return (spa_by_guid(pool_guid
, device_guid
) != NULL
);
1369 spa_strdup(const char *s
)
1375 new = kmem_alloc(len
+ 1, KM_SLEEP
);
1383 spa_strfree(char *s
)
1385 kmem_free(s
, strlen(s
) + 1);
1389 spa_get_random(uint64_t range
)
1398 (void) random_get_pseudo_bytes((void *)&r
, sizeof (uint64_t));
1404 spa_generate_guid(spa_t
*spa
)
1406 uint64_t guid
= spa_get_random(-1ULL);
1409 while (guid
== 0 || spa_guid_exists(spa_guid(spa
), guid
))
1410 guid
= spa_get_random(-1ULL);
1412 while (guid
== 0 || spa_guid_exists(guid
, 0))
1413 guid
= spa_get_random(-1ULL);
1420 snprintf_blkptr(char *buf
, size_t buflen
, const blkptr_t
*bp
)
1423 char *checksum
= NULL
;
1424 char *compress
= NULL
;
1425 char *crypt_type
= NULL
;
1428 if (BP_GET_TYPE(bp
) & DMU_OT_NEWTYPE
) {
1429 dmu_object_byteswap_t bswap
=
1430 DMU_OT_BYTESWAP(BP_GET_TYPE(bp
));
1431 (void) snprintf(type
, sizeof (type
), "bswap %s %s",
1432 DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) ?
1433 "metadata" : "data",
1434 dmu_ot_byteswap
[bswap
].ob_name
);
1436 (void) strlcpy(type
, dmu_ot
[BP_GET_TYPE(bp
)].ot_name
,
1439 if (BP_IS_ENCRYPTED(bp
)) {
1440 crypt_type
= "encrypted";
1441 } else if (BP_IS_AUTHENTICATED(bp
)) {
1442 crypt_type
= "authenticated";
1443 } else if (BP_HAS_INDIRECT_MAC_CKSUM(bp
)) {
1444 crypt_type
= "indirect-MAC";
1446 crypt_type
= "unencrypted";
1448 if (!BP_IS_EMBEDDED(bp
)) {
1450 zio_checksum_table
[BP_GET_CHECKSUM(bp
)].ci_name
;
1452 compress
= zio_compress_table
[BP_GET_COMPRESS(bp
)].ci_name
;
1455 SNPRINTF_BLKPTR(snprintf
, ' ', buf
, buflen
, bp
, type
, checksum
,
1456 crypt_type
, compress
);
1460 spa_freeze(spa_t
*spa
)
1462 uint64_t freeze_txg
= 0;
1464 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1465 if (spa
->spa_freeze_txg
== UINT64_MAX
) {
1466 freeze_txg
= spa_last_synced_txg(spa
) + TXG_SIZE
;
1467 spa
->spa_freeze_txg
= freeze_txg
;
1469 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1470 if (freeze_txg
!= 0)
1471 txg_wait_synced(spa_get_dsl(spa
), freeze_txg
);
1475 zfs_panic_recover(const char *fmt
, ...)
1480 vcmn_err(zfs_recover
? CE_WARN
: CE_PANIC
, fmt
, adx
);
1485 * This is a stripped-down version of strtoull, suitable only for converting
1486 * lowercase hexadecimal numbers that don't overflow.
1489 zfs_strtonum(const char *str
, char **nptr
)
1495 while ((c
= *str
) != '\0') {
1496 if (c
>= '0' && c
<= '9')
1498 else if (c
>= 'a' && c
<= 'f')
1499 digit
= 10 + c
- 'a';
1510 *nptr
= (char *)str
;
1516 * ==========================================================================
1517 * Accessor functions
1518 * ==========================================================================
1522 spa_shutting_down(spa_t
*spa
)
1524 return (spa
->spa_async_suspended
);
1528 spa_get_dsl(spa_t
*spa
)
1530 return (spa
->spa_dsl_pool
);
1534 spa_is_initializing(spa_t
*spa
)
1536 return (spa
->spa_is_initializing
);
1540 spa_get_rootblkptr(spa_t
*spa
)
1542 return (&spa
->spa_ubsync
.ub_rootbp
);
1546 spa_set_rootblkptr(spa_t
*spa
, const blkptr_t
*bp
)
1548 spa
->spa_uberblock
.ub_rootbp
= *bp
;
1552 spa_altroot(spa_t
*spa
, char *buf
, size_t buflen
)
1554 if (spa
->spa_root
== NULL
)
1557 (void) strncpy(buf
, spa
->spa_root
, buflen
);
1561 spa_sync_pass(spa_t
*spa
)
1563 return (spa
->spa_sync_pass
);
1567 spa_name(spa_t
*spa
)
1569 return (spa
->spa_name
);
1573 spa_guid(spa_t
*spa
)
1575 dsl_pool_t
*dp
= spa_get_dsl(spa
);
1579 * If we fail to parse the config during spa_load(), we can go through
1580 * the error path (which posts an ereport) and end up here with no root
1581 * vdev. We stash the original pool guid in 'spa_config_guid' to handle
1584 if (spa
->spa_root_vdev
== NULL
)
1585 return (spa
->spa_config_guid
);
1587 guid
= spa
->spa_last_synced_guid
!= 0 ?
1588 spa
->spa_last_synced_guid
: spa
->spa_root_vdev
->vdev_guid
;
1591 * Return the most recently synced out guid unless we're
1592 * in syncing context.
1594 if (dp
&& dsl_pool_sync_context(dp
))
1595 return (spa
->spa_root_vdev
->vdev_guid
);
1601 spa_load_guid(spa_t
*spa
)
1604 * This is a GUID that exists solely as a reference for the
1605 * purposes of the arc. It is generated at load time, and
1606 * is never written to persistent storage.
1608 return (spa
->spa_load_guid
);
1612 spa_last_synced_txg(spa_t
*spa
)
1614 return (spa
->spa_ubsync
.ub_txg
);
1618 spa_first_txg(spa_t
*spa
)
1620 return (spa
->spa_first_txg
);
1624 spa_syncing_txg(spa_t
*spa
)
1626 return (spa
->spa_syncing_txg
);
1630 * Return the last txg where data can be dirtied. The final txgs
1631 * will be used to just clear out any deferred frees that remain.
1634 spa_final_dirty_txg(spa_t
*spa
)
1636 return (spa
->spa_final_txg
- TXG_DEFER_SIZE
);
1640 spa_state(spa_t
*spa
)
1642 return (spa
->spa_state
);
1646 spa_load_state(spa_t
*spa
)
1648 return (spa
->spa_load_state
);
1652 spa_freeze_txg(spa_t
*spa
)
1654 return (spa
->spa_freeze_txg
);
1658 * Return the inflated asize for a logical write in bytes. This is used by the
1659 * DMU to calculate the space a logical write will require on disk.
1660 * If lsize is smaller than the largest physical block size allocatable on this
1661 * pool we use its value instead, since the write will end up using the whole
1665 spa_get_worst_case_asize(spa_t
*spa
, uint64_t lsize
)
1668 return (0); /* No inflation needed */
1669 return (MAX(lsize
, 1 << spa
->spa_max_ashift
) * spa_asize_inflation
);
1673 * Return the amount of slop space in bytes. It is 1/32 of the pool (3.2%),
1674 * or at least 128MB, unless that would cause it to be more than half the
1677 * See the comment above spa_slop_shift for details.
1680 spa_get_slop_space(spa_t
*spa
)
1682 uint64_t space
= spa_get_dspace(spa
);
1683 return (MAX(space
>> spa_slop_shift
, MIN(space
>> 1, spa_min_slop
)));
1687 spa_get_dspace(spa_t
*spa
)
1689 return (spa
->spa_dspace
);
1693 spa_update_dspace(spa_t
*spa
)
1695 spa
->spa_dspace
= metaslab_class_get_dspace(spa_normal_class(spa
)) +
1696 ddt_get_dedup_dspace(spa
);
1700 * Return the failure mode that has been set to this pool. The default
1701 * behavior will be to block all I/Os when a complete failure occurs.
1704 spa_get_failmode(spa_t
*spa
)
1706 return (spa
->spa_failmode
);
1710 spa_suspended(spa_t
*spa
)
1712 return (spa
->spa_suspended
);
1716 spa_version(spa_t
*spa
)
1718 return (spa
->spa_ubsync
.ub_version
);
1722 spa_deflate(spa_t
*spa
)
1724 return (spa
->spa_deflate
);
1728 spa_normal_class(spa_t
*spa
)
1730 return (spa
->spa_normal_class
);
1734 spa_log_class(spa_t
*spa
)
1736 return (spa
->spa_log_class
);
1740 spa_evicting_os_register(spa_t
*spa
, objset_t
*os
)
1742 mutex_enter(&spa
->spa_evicting_os_lock
);
1743 list_insert_head(&spa
->spa_evicting_os_list
, os
);
1744 mutex_exit(&spa
->spa_evicting_os_lock
);
1748 spa_evicting_os_deregister(spa_t
*spa
, objset_t
*os
)
1750 mutex_enter(&spa
->spa_evicting_os_lock
);
1751 list_remove(&spa
->spa_evicting_os_list
, os
);
1752 cv_broadcast(&spa
->spa_evicting_os_cv
);
1753 mutex_exit(&spa
->spa_evicting_os_lock
);
1757 spa_evicting_os_wait(spa_t
*spa
)
1759 mutex_enter(&spa
->spa_evicting_os_lock
);
1760 while (!list_is_empty(&spa
->spa_evicting_os_list
))
1761 cv_wait(&spa
->spa_evicting_os_cv
, &spa
->spa_evicting_os_lock
);
1762 mutex_exit(&spa
->spa_evicting_os_lock
);
1764 dmu_buf_user_evict_wait();
1768 spa_max_replication(spa_t
*spa
)
1771 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
1772 * handle BPs with more than one DVA allocated. Set our max
1773 * replication level accordingly.
1775 if (spa_version(spa
) < SPA_VERSION_DITTO_BLOCKS
)
1777 return (MIN(SPA_DVAS_PER_BP
, spa_max_replication_override
));
1781 spa_prev_software_version(spa_t
*spa
)
1783 return (spa
->spa_prev_software_version
);
1787 spa_deadman_synctime(spa_t
*spa
)
1789 return (spa
->spa_deadman_synctime
);
1793 spa_deadman_ziotime(spa_t
*spa
)
1795 return (spa
->spa_deadman_ziotime
);
1799 spa_get_deadman_failmode(spa_t
*spa
)
1801 return (spa
->spa_deadman_failmode
);
1805 spa_set_deadman_failmode(spa_t
*spa
, const char *failmode
)
1807 if (strcmp(failmode
, "wait") == 0)
1808 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_WAIT
;
1809 else if (strcmp(failmode
, "continue") == 0)
1810 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_CONTINUE
;
1811 else if (strcmp(failmode
, "panic") == 0)
1812 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_PANIC
;
1814 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_WAIT
;
1818 dva_get_dsize_sync(spa_t
*spa
, const dva_t
*dva
)
1820 uint64_t asize
= DVA_GET_ASIZE(dva
);
1821 uint64_t dsize
= asize
;
1823 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
1825 if (asize
!= 0 && spa
->spa_deflate
) {
1826 vdev_t
*vd
= vdev_lookup_top(spa
, DVA_GET_VDEV(dva
));
1828 dsize
= (asize
>> SPA_MINBLOCKSHIFT
) *
1829 vd
->vdev_deflate_ratio
;
1836 bp_get_dsize_sync(spa_t
*spa
, const blkptr_t
*bp
)
1840 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
1841 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
1847 bp_get_dsize(spa_t
*spa
, const blkptr_t
*bp
)
1851 spa_config_enter(spa
, SCL_VDEV
, FTAG
, RW_READER
);
1853 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
1854 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
1856 spa_config_exit(spa
, SCL_VDEV
, FTAG
);
1862 * ==========================================================================
1863 * Initialization and Termination
1864 * ==========================================================================
1868 spa_name_compare(const void *a1
, const void *a2
)
1870 const spa_t
*s1
= a1
;
1871 const spa_t
*s2
= a2
;
1874 s
= strcmp(s1
->spa_name
, s2
->spa_name
);
1876 return (AVL_ISIGN(s
));
1888 mutex_init(&spa_namespace_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1889 mutex_init(&spa_spare_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1890 mutex_init(&spa_l2cache_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1891 cv_init(&spa_namespace_cv
, NULL
, CV_DEFAULT
, NULL
);
1893 avl_create(&spa_namespace_avl
, spa_name_compare
, sizeof (spa_t
),
1894 offsetof(spa_t
, spa_avl
));
1896 avl_create(&spa_spare_avl
, spa_spare_compare
, sizeof (spa_aux_t
),
1897 offsetof(spa_aux_t
, aux_avl
));
1899 avl_create(&spa_l2cache_avl
, spa_l2cache_compare
, sizeof (spa_aux_t
),
1900 offsetof(spa_aux_t
, aux_avl
));
1902 spa_mode_global
= mode
;
1905 if (spa_mode_global
!= FREAD
&& dprintf_find_string("watch")) {
1906 struct sigaction sa
;
1908 sa
.sa_flags
= SA_SIGINFO
;
1909 sigemptyset(&sa
.sa_mask
);
1910 sa
.sa_sigaction
= arc_buf_sigsegv
;
1912 if (sigaction(SIGSEGV
, &sa
, NULL
) == -1) {
1913 perror("could not enable watchpoints: "
1914 "sigaction(SIGSEGV, ...) = ");
1925 metaslab_alloc_trace_init();
1930 vdev_cache_stat_init();
1931 vdev_mirror_stat_init();
1932 vdev_raidz_math_init();
1936 zpool_feature_init();
1951 vdev_cache_stat_fini();
1952 vdev_mirror_stat_fini();
1953 vdev_raidz_math_fini();
1958 metaslab_alloc_trace_fini();
1966 avl_destroy(&spa_namespace_avl
);
1967 avl_destroy(&spa_spare_avl
);
1968 avl_destroy(&spa_l2cache_avl
);
1970 cv_destroy(&spa_namespace_cv
);
1971 mutex_destroy(&spa_namespace_lock
);
1972 mutex_destroy(&spa_spare_lock
);
1973 mutex_destroy(&spa_l2cache_lock
);
1977 * Return whether this pool has slogs. No locking needed.
1978 * It's not a problem if the wrong answer is returned as it's only for
1979 * performance and not correctness
1982 spa_has_slogs(spa_t
*spa
)
1984 return (spa
->spa_log_class
->mc_rotor
!= NULL
);
1988 spa_get_log_state(spa_t
*spa
)
1990 return (spa
->spa_log_state
);
1994 spa_set_log_state(spa_t
*spa
, spa_log_state_t state
)
1996 spa
->spa_log_state
= state
;
2000 spa_is_root(spa_t
*spa
)
2002 return (spa
->spa_is_root
);
2006 spa_writeable(spa_t
*spa
)
2008 return (!!(spa
->spa_mode
& FWRITE
));
2012 * Returns true if there is a pending sync task in any of the current
2013 * syncing txg, the current quiescing txg, or the current open txg.
2016 spa_has_pending_synctask(spa_t
*spa
)
2018 return (!txg_all_lists_empty(&spa
->spa_dsl_pool
->dp_sync_tasks
));
2022 spa_mode(spa_t
*spa
)
2024 return (spa
->spa_mode
);
2028 spa_bootfs(spa_t
*spa
)
2030 return (spa
->spa_bootfs
);
2034 spa_delegation(spa_t
*spa
)
2036 return (spa
->spa_delegation
);
2040 spa_meta_objset(spa_t
*spa
)
2042 return (spa
->spa_meta_objset
);
2046 spa_dedup_checksum(spa_t
*spa
)
2048 return (spa
->spa_dedup_checksum
);
2052 * Reset pool scan stat per scan pass (or reboot).
2055 spa_scan_stat_init(spa_t
*spa
)
2057 /* data not stored on disk */
2058 spa
->spa_scan_pass_start
= gethrestime_sec();
2059 if (dsl_scan_is_paused_scrub(spa
->spa_dsl_pool
->dp_scan
))
2060 spa
->spa_scan_pass_scrub_pause
= spa
->spa_scan_pass_start
;
2062 spa
->spa_scan_pass_scrub_pause
= 0;
2063 spa
->spa_scan_pass_scrub_spent_paused
= 0;
2064 spa
->spa_scan_pass_exam
= 0;
2065 spa
->spa_scan_pass_issued
= 0;
2066 vdev_scan_stat_init(spa
->spa_root_vdev
);
2070 * Get scan stats for zpool status reports
2073 spa_scan_get_stats(spa_t
*spa
, pool_scan_stat_t
*ps
)
2075 dsl_scan_t
*scn
= spa
->spa_dsl_pool
? spa
->spa_dsl_pool
->dp_scan
: NULL
;
2077 if (scn
== NULL
|| scn
->scn_phys
.scn_func
== POOL_SCAN_NONE
)
2078 return (SET_ERROR(ENOENT
));
2079 bzero(ps
, sizeof (pool_scan_stat_t
));
2081 /* data stored on disk */
2082 ps
->pss_func
= scn
->scn_phys
.scn_func
;
2083 ps
->pss_state
= scn
->scn_phys
.scn_state
;
2084 ps
->pss_start_time
= scn
->scn_phys
.scn_start_time
;
2085 ps
->pss_end_time
= scn
->scn_phys
.scn_end_time
;
2086 ps
->pss_to_examine
= scn
->scn_phys
.scn_to_examine
;
2087 ps
->pss_examined
= scn
->scn_phys
.scn_examined
;
2088 ps
->pss_to_process
= scn
->scn_phys
.scn_to_process
;
2089 ps
->pss_processed
= scn
->scn_phys
.scn_processed
;
2090 ps
->pss_errors
= scn
->scn_phys
.scn_errors
;
2092 /* data not stored on disk */
2093 ps
->pss_pass_exam
= spa
->spa_scan_pass_exam
;
2094 ps
->pss_pass_start
= spa
->spa_scan_pass_start
;
2095 ps
->pss_pass_scrub_pause
= spa
->spa_scan_pass_scrub_pause
;
2096 ps
->pss_pass_scrub_spent_paused
= spa
->spa_scan_pass_scrub_spent_paused
;
2097 ps
->pss_pass_issued
= spa
->spa_scan_pass_issued
;
2099 scn
->scn_issued_before_pass
+ spa
->spa_scan_pass_issued
;
2105 spa_debug_enabled(spa_t
*spa
)
2107 return (spa
->spa_debug
);
2111 spa_maxblocksize(spa_t
*spa
)
2113 if (spa_feature_is_enabled(spa
, SPA_FEATURE_LARGE_BLOCKS
))
2114 return (SPA_MAXBLOCKSIZE
);
2116 return (SPA_OLD_MAXBLOCKSIZE
);
2120 spa_maxdnodesize(spa_t
*spa
)
2122 if (spa_feature_is_enabled(spa
, SPA_FEATURE_LARGE_DNODE
))
2123 return (DNODE_MAX_SIZE
);
2125 return (DNODE_MIN_SIZE
);
2129 spa_multihost(spa_t
*spa
)
2131 return (spa
->spa_multihost
? B_TRUE
: B_FALSE
);
2135 spa_get_hostid(void)
2137 unsigned long myhostid
;
2140 myhostid
= zone_get_hostid(NULL
);
2143 * We're emulating the system's hostid in userland, so
2144 * we can't use zone_get_hostid().
2146 (void) ddi_strtoul(hw_serial
, NULL
, 10, &myhostid
);
2147 #endif /* _KERNEL */
2152 #if defined(_KERNEL) && defined(HAVE_SPL)
2154 #include <linux/mod_compat.h>
2157 param_set_deadman_failmode(const char *val
, zfs_kernel_param_t
*kp
)
2163 return (SET_ERROR(-EINVAL
));
2165 if ((p
= strchr(val
, '\n')) != NULL
)
2168 if (strcmp(val
, "wait") != 0 && strcmp(val
, "continue") != 0 &&
2169 strcmp(val
, "panic"))
2170 return (SET_ERROR(-EINVAL
));
2172 mutex_enter(&spa_namespace_lock
);
2173 while ((spa
= spa_next(spa
)) != NULL
)
2174 spa_set_deadman_failmode(spa
, val
);
2175 mutex_exit(&spa_namespace_lock
);
2177 return (param_set_charp(val
, kp
));
2180 /* Namespace manipulation */
2181 EXPORT_SYMBOL(spa_lookup
);
2182 EXPORT_SYMBOL(spa_add
);
2183 EXPORT_SYMBOL(spa_remove
);
2184 EXPORT_SYMBOL(spa_next
);
2186 /* Refcount functions */
2187 EXPORT_SYMBOL(spa_open_ref
);
2188 EXPORT_SYMBOL(spa_close
);
2189 EXPORT_SYMBOL(spa_refcount_zero
);
2191 /* Pool configuration lock */
2192 EXPORT_SYMBOL(spa_config_tryenter
);
2193 EXPORT_SYMBOL(spa_config_enter
);
2194 EXPORT_SYMBOL(spa_config_exit
);
2195 EXPORT_SYMBOL(spa_config_held
);
2197 /* Pool vdev add/remove lock */
2198 EXPORT_SYMBOL(spa_vdev_enter
);
2199 EXPORT_SYMBOL(spa_vdev_exit
);
2201 /* Pool vdev state change lock */
2202 EXPORT_SYMBOL(spa_vdev_state_enter
);
2203 EXPORT_SYMBOL(spa_vdev_state_exit
);
2205 /* Accessor functions */
2206 EXPORT_SYMBOL(spa_shutting_down
);
2207 EXPORT_SYMBOL(spa_get_dsl
);
2208 EXPORT_SYMBOL(spa_get_rootblkptr
);
2209 EXPORT_SYMBOL(spa_set_rootblkptr
);
2210 EXPORT_SYMBOL(spa_altroot
);
2211 EXPORT_SYMBOL(spa_sync_pass
);
2212 EXPORT_SYMBOL(spa_name
);
2213 EXPORT_SYMBOL(spa_guid
);
2214 EXPORT_SYMBOL(spa_last_synced_txg
);
2215 EXPORT_SYMBOL(spa_first_txg
);
2216 EXPORT_SYMBOL(spa_syncing_txg
);
2217 EXPORT_SYMBOL(spa_version
);
2218 EXPORT_SYMBOL(spa_state
);
2219 EXPORT_SYMBOL(spa_load_state
);
2220 EXPORT_SYMBOL(spa_freeze_txg
);
2221 EXPORT_SYMBOL(spa_get_dspace
);
2222 EXPORT_SYMBOL(spa_update_dspace
);
2223 EXPORT_SYMBOL(spa_deflate
);
2224 EXPORT_SYMBOL(spa_normal_class
);
2225 EXPORT_SYMBOL(spa_log_class
);
2226 EXPORT_SYMBOL(spa_max_replication
);
2227 EXPORT_SYMBOL(spa_prev_software_version
);
2228 EXPORT_SYMBOL(spa_get_failmode
);
2229 EXPORT_SYMBOL(spa_suspended
);
2230 EXPORT_SYMBOL(spa_bootfs
);
2231 EXPORT_SYMBOL(spa_delegation
);
2232 EXPORT_SYMBOL(spa_meta_objset
);
2233 EXPORT_SYMBOL(spa_maxblocksize
);
2234 EXPORT_SYMBOL(spa_maxdnodesize
);
2236 /* Miscellaneous support routines */
2237 EXPORT_SYMBOL(spa_rename
);
2238 EXPORT_SYMBOL(spa_guid_exists
);
2239 EXPORT_SYMBOL(spa_strdup
);
2240 EXPORT_SYMBOL(spa_strfree
);
2241 EXPORT_SYMBOL(spa_get_random
);
2242 EXPORT_SYMBOL(spa_generate_guid
);
2243 EXPORT_SYMBOL(snprintf_blkptr
);
2244 EXPORT_SYMBOL(spa_freeze
);
2245 EXPORT_SYMBOL(spa_upgrade
);
2246 EXPORT_SYMBOL(spa_evict_all
);
2247 EXPORT_SYMBOL(spa_lookup_by_guid
);
2248 EXPORT_SYMBOL(spa_has_spare
);
2249 EXPORT_SYMBOL(dva_get_dsize_sync
);
2250 EXPORT_SYMBOL(bp_get_dsize_sync
);
2251 EXPORT_SYMBOL(bp_get_dsize
);
2252 EXPORT_SYMBOL(spa_has_slogs
);
2253 EXPORT_SYMBOL(spa_is_root
);
2254 EXPORT_SYMBOL(spa_writeable
);
2255 EXPORT_SYMBOL(spa_mode
);
2256 EXPORT_SYMBOL(spa_namespace_lock
);
2259 module_param(zfs_flags
, uint
, 0644);
2260 MODULE_PARM_DESC(zfs_flags
, "Set additional debugging flags");
2262 module_param(zfs_recover
, int, 0644);
2263 MODULE_PARM_DESC(zfs_recover
, "Set to attempt to recover from fatal errors");
2265 module_param(zfs_free_leak_on_eio
, int, 0644);
2266 MODULE_PARM_DESC(zfs_free_leak_on_eio
,
2267 "Set to ignore IO errors during free and permanently leak the space");
2269 module_param(zfs_deadman_synctime_ms
, ulong
, 0644);
2270 MODULE_PARM_DESC(zfs_deadman_synctime_ms
,
2271 "Pool sync expiration time in milliseconds");
2273 module_param(zfs_deadman_ziotime_ms
, ulong
, 0644);
2274 MODULE_PARM_DESC(zfs_deadman_ziotime_ms
,
2275 "IO expiration time in milliseconds");
2277 module_param(zfs_deadman_checktime_ms
, ulong
, 0644);
2278 MODULE_PARM_DESC(zfs_deadman_checktime_ms
,
2279 "Dead I/O check interval in milliseconds");
2281 module_param(zfs_deadman_enabled
, int, 0644);
2282 MODULE_PARM_DESC(zfs_deadman_enabled
, "Enable deadman timer");
2284 module_param_call(zfs_deadman_failmode
, param_set_deadman_failmode
,
2285 param_get_charp
, &zfs_deadman_failmode
, 0644);
2286 MODULE_PARM_DESC(zfs_deadman_failmode
, "Failmode for deadman timer");
2288 module_param(spa_asize_inflation
, int, 0644);
2289 MODULE_PARM_DESC(spa_asize_inflation
,
2290 "SPA size estimate multiplication factor");
2292 module_param(spa_slop_shift
, int, 0644);
2293 MODULE_PARM_DESC(spa_slop_shift
, "Reserved free space in pool");