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 int zfs_flags
= ~(ZFS_DEBUG_DPRINTF
| ZFS_DEBUG_SET_ERROR
| ZFS_DEBUG_SPA
);
252 * zfs_recover can be set to nonzero to attempt to recover from
253 * otherwise-fatal errors, typically caused by on-disk corruption. When
254 * set, calls to zfs_panic_recover() will turn into warning messages.
255 * This should only be used as a last resort, as it typically results
256 * in leaked space, or worse.
258 int zfs_recover
= B_FALSE
;
261 * If destroy encounters an EIO while reading metadata (e.g. indirect
262 * blocks), space referenced by the missing metadata can not be freed.
263 * Normally this causes the background destroy to become "stalled", as
264 * it is unable to make forward progress. While in this stalled state,
265 * all remaining space to free from the error-encountering filesystem is
266 * "temporarily leaked". Set this flag to cause it to ignore the EIO,
267 * permanently leak the space from indirect blocks that can not be read,
268 * and continue to free everything else that it can.
270 * The default, "stalling" behavior is useful if the storage partially
271 * fails (i.e. some but not all i/os fail), and then later recovers. In
272 * this case, we will be able to continue pool operations while it is
273 * partially failed, and when it recovers, we can continue to free the
274 * space, with no leaks. However, note that this case is actually
277 * Typically pools either (a) fail completely (but perhaps temporarily,
278 * e.g. a top-level vdev going offline), or (b) have localized,
279 * permanent errors (e.g. disk returns the wrong data due to bit flip or
280 * firmware bug). In case (a), this setting does not matter because the
281 * pool will be suspended and the sync thread will not be able to make
282 * forward progress regardless. In case (b), because the error is
283 * permanent, the best we can do is leak the minimum amount of space,
284 * which is what setting this flag will do. Therefore, it is reasonable
285 * for this flag to normally be set, but we chose the more conservative
286 * approach of not setting it, so that there is no possibility of
287 * leaking space in the "partial temporary" failure case.
289 int zfs_free_leak_on_eio
= B_FALSE
;
292 * Expiration time in milliseconds. This value has two meanings. First it is
293 * used to determine when the spa_deadman() logic should fire. By default the
294 * spa_deadman() will fire if spa_sync() has not completed in 600 seconds.
295 * Secondly, the value determines if an I/O is considered "hung". Any I/O that
296 * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting
297 * in one of three behaviors controlled by zfs_deadman_failmode.
299 unsigned long zfs_deadman_synctime_ms
= 600000ULL;
302 * This value controls the maximum amount of time zio_wait() will block for an
303 * outstanding IO. By default this is 300 seconds at which point the "hung"
304 * behavior will be applied as described for zfs_deadman_synctime_ms.
306 unsigned long zfs_deadman_ziotime_ms
= 300000ULL;
309 * Check time in milliseconds. This defines the frequency at which we check
312 unsigned long zfs_deadman_checktime_ms
= 60000ULL;
315 * By default the deadman is enabled.
317 int zfs_deadman_enabled
= 1;
320 * Controls the behavior of the deadman when it detects a "hung" I/O.
321 * Valid values are zfs_deadman_failmode=<wait|continue|panic>.
323 * wait - Wait for the "hung" I/O (default)
324 * continue - Attempt to recover from a "hung" I/O
325 * panic - Panic the system
327 char *zfs_deadman_failmode
= "wait";
330 * The worst case is single-sector max-parity RAID-Z blocks, in which
331 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
332 * times the size; so just assume that. Add to this the fact that
333 * we can have up to 3 DVAs per bp, and one more factor of 2 because
334 * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together,
336 * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
338 int spa_asize_inflation
= 24;
341 * Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in
342 * the pool to be consumed. This ensures that we don't run the pool
343 * completely out of space, due to unaccounted changes (e.g. to the MOS).
344 * It also limits the worst-case time to allocate space. If we have
345 * less than this amount of free space, most ZPL operations (e.g. write,
346 * create) will return ENOSPC.
348 * Certain operations (e.g. file removal, most administrative actions) can
349 * use half the slop space. They will only return ENOSPC if less than half
350 * the slop space is free. Typically, once the pool has less than the slop
351 * space free, the user will use these operations to free up space in the pool.
352 * These are the operations that call dsl_pool_adjustedsize() with the netfree
353 * argument set to TRUE.
355 * A very restricted set of operations are always permitted, regardless of
356 * the amount of free space. These are the operations that call
357 * dsl_sync_task(ZFS_SPACE_CHECK_NONE), e.g. "zfs destroy". If these
358 * operations result in a net increase in the amount of space used,
359 * it is possible to run the pool completely out of space, causing it to
360 * be permanently read-only.
362 * Note that on very small pools, the slop space will be larger than
363 * 3.2%, in an effort to have it be at least spa_min_slop (128MB),
364 * but we never allow it to be more than half the pool size.
366 * See also the comments in zfs_space_check_t.
368 int spa_slop_shift
= 5;
369 uint64_t spa_min_slop
= 128 * 1024 * 1024;
372 * ==========================================================================
374 * ==========================================================================
377 spa_config_lock_init(spa_t
*spa
)
379 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
380 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
381 mutex_init(&scl
->scl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
382 cv_init(&scl
->scl_cv
, NULL
, CV_DEFAULT
, NULL
);
383 refcount_create_untracked(&scl
->scl_count
);
384 scl
->scl_writer
= NULL
;
385 scl
->scl_write_wanted
= 0;
390 spa_config_lock_destroy(spa_t
*spa
)
392 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
393 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
394 mutex_destroy(&scl
->scl_lock
);
395 cv_destroy(&scl
->scl_cv
);
396 refcount_destroy(&scl
->scl_count
);
397 ASSERT(scl
->scl_writer
== NULL
);
398 ASSERT(scl
->scl_write_wanted
== 0);
403 spa_config_tryenter(spa_t
*spa
, int locks
, void *tag
, krw_t rw
)
405 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
406 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
407 if (!(locks
& (1 << i
)))
409 mutex_enter(&scl
->scl_lock
);
410 if (rw
== RW_READER
) {
411 if (scl
->scl_writer
|| scl
->scl_write_wanted
) {
412 mutex_exit(&scl
->scl_lock
);
413 spa_config_exit(spa
, locks
& ((1 << i
) - 1),
418 ASSERT(scl
->scl_writer
!= curthread
);
419 if (!refcount_is_zero(&scl
->scl_count
)) {
420 mutex_exit(&scl
->scl_lock
);
421 spa_config_exit(spa
, locks
& ((1 << i
) - 1),
425 scl
->scl_writer
= curthread
;
427 (void) refcount_add(&scl
->scl_count
, tag
);
428 mutex_exit(&scl
->scl_lock
);
434 spa_config_enter(spa_t
*spa
, int locks
, void *tag
, krw_t rw
)
438 ASSERT3U(SCL_LOCKS
, <, sizeof (wlocks_held
) * NBBY
);
440 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
441 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
442 if (scl
->scl_writer
== curthread
)
443 wlocks_held
|= (1 << i
);
444 if (!(locks
& (1 << i
)))
446 mutex_enter(&scl
->scl_lock
);
447 if (rw
== RW_READER
) {
448 while (scl
->scl_writer
|| scl
->scl_write_wanted
) {
449 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
452 ASSERT(scl
->scl_writer
!= curthread
);
453 while (!refcount_is_zero(&scl
->scl_count
)) {
454 scl
->scl_write_wanted
++;
455 cv_wait(&scl
->scl_cv
, &scl
->scl_lock
);
456 scl
->scl_write_wanted
--;
458 scl
->scl_writer
= curthread
;
460 (void) refcount_add(&scl
->scl_count
, tag
);
461 mutex_exit(&scl
->scl_lock
);
463 ASSERT(wlocks_held
<= locks
);
467 spa_config_exit(spa_t
*spa
, int locks
, void *tag
)
469 for (int i
= SCL_LOCKS
- 1; i
>= 0; i
--) {
470 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
471 if (!(locks
& (1 << i
)))
473 mutex_enter(&scl
->scl_lock
);
474 ASSERT(!refcount_is_zero(&scl
->scl_count
));
475 if (refcount_remove(&scl
->scl_count
, tag
) == 0) {
476 ASSERT(scl
->scl_writer
== NULL
||
477 scl
->scl_writer
== curthread
);
478 scl
->scl_writer
= NULL
; /* OK in either case */
479 cv_broadcast(&scl
->scl_cv
);
481 mutex_exit(&scl
->scl_lock
);
486 spa_config_held(spa_t
*spa
, int locks
, krw_t rw
)
490 for (int i
= 0; i
< SCL_LOCKS
; i
++) {
491 spa_config_lock_t
*scl
= &spa
->spa_config_lock
[i
];
492 if (!(locks
& (1 << i
)))
494 if ((rw
== RW_READER
&& !refcount_is_zero(&scl
->scl_count
)) ||
495 (rw
== RW_WRITER
&& scl
->scl_writer
== curthread
))
496 locks_held
|= 1 << i
;
503 * ==========================================================================
504 * SPA namespace functions
505 * ==========================================================================
509 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
510 * Returns NULL if no matching spa_t is found.
513 spa_lookup(const char *name
)
515 static spa_t search
; /* spa_t is large; don't allocate on stack */
520 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
522 (void) strlcpy(search
.spa_name
, name
, sizeof (search
.spa_name
));
525 * If it's a full dataset name, figure out the pool name and
528 cp
= strpbrk(search
.spa_name
, "/@#");
532 spa
= avl_find(&spa_namespace_avl
, &search
, &where
);
538 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
539 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues
540 * looking for potentially hung I/Os.
543 spa_deadman(void *arg
)
547 /* Disable the deadman if the pool is suspended. */
548 if (spa_suspended(spa
))
551 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
552 (gethrtime() - spa
->spa_sync_starttime
) / NANOSEC
,
553 ++spa
->spa_deadman_calls
);
554 if (zfs_deadman_enabled
)
555 vdev_deadman(spa
->spa_root_vdev
, FTAG
);
557 spa
->spa_deadman_tqid
= taskq_dispatch_delay(system_delay_taskq
,
558 spa_deadman
, spa
, TQ_SLEEP
, ddi_get_lbolt() +
559 MSEC_TO_TICK(zfs_deadman_checktime_ms
));
563 * Create an uninitialized spa_t with the given name. Requires
564 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
565 * exist by calling spa_lookup() first.
568 spa_add(const char *name
, nvlist_t
*config
, const char *altroot
)
571 spa_config_dirent_t
*dp
;
573 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
575 spa
= kmem_zalloc(sizeof (spa_t
), KM_SLEEP
);
577 mutex_init(&spa
->spa_async_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
578 mutex_init(&spa
->spa_errlist_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
579 mutex_init(&spa
->spa_errlog_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
580 mutex_init(&spa
->spa_evicting_os_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
581 mutex_init(&spa
->spa_history_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
582 mutex_init(&spa
->spa_proc_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
583 mutex_init(&spa
->spa_props_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
584 mutex_init(&spa
->spa_cksum_tmpls_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
585 mutex_init(&spa
->spa_scrub_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
586 mutex_init(&spa
->spa_suspend_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
587 mutex_init(&spa
->spa_vdev_top_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
588 mutex_init(&spa
->spa_feat_stats_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
589 mutex_init(&spa
->spa_alloc_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
591 cv_init(&spa
->spa_async_cv
, NULL
, CV_DEFAULT
, NULL
);
592 cv_init(&spa
->spa_evicting_os_cv
, NULL
, CV_DEFAULT
, NULL
);
593 cv_init(&spa
->spa_proc_cv
, NULL
, CV_DEFAULT
, NULL
);
594 cv_init(&spa
->spa_scrub_io_cv
, NULL
, CV_DEFAULT
, NULL
);
595 cv_init(&spa
->spa_suspend_cv
, NULL
, CV_DEFAULT
, NULL
);
597 for (int t
= 0; t
< TXG_SIZE
; t
++)
598 bplist_create(&spa
->spa_free_bplist
[t
]);
600 (void) strlcpy(spa
->spa_name
, name
, sizeof (spa
->spa_name
));
601 spa
->spa_state
= POOL_STATE_UNINITIALIZED
;
602 spa
->spa_freeze_txg
= UINT64_MAX
;
603 spa
->spa_final_txg
= UINT64_MAX
;
604 spa
->spa_load_max_txg
= UINT64_MAX
;
606 spa
->spa_proc_state
= SPA_PROC_NONE
;
608 spa
->spa_deadman_synctime
= MSEC2NSEC(zfs_deadman_synctime_ms
);
609 spa
->spa_deadman_ziotime
= MSEC2NSEC(zfs_deadman_ziotime_ms
);
610 spa_set_deadman_failmode(spa
, zfs_deadman_failmode
);
612 refcount_create(&spa
->spa_refcount
);
613 spa_config_lock_init(spa
);
616 avl_add(&spa_namespace_avl
, spa
);
619 * Set the alternate root, if there is one.
622 spa
->spa_root
= spa_strdup(altroot
);
624 avl_create(&spa
->spa_alloc_tree
, zio_bookmark_compare
,
625 sizeof (zio_t
), offsetof(zio_t
, io_alloc_node
));
628 * Every pool starts with the default cachefile
630 list_create(&spa
->spa_config_list
, sizeof (spa_config_dirent_t
),
631 offsetof(spa_config_dirent_t
, scd_link
));
633 dp
= kmem_zalloc(sizeof (spa_config_dirent_t
), KM_SLEEP
);
634 dp
->scd_path
= altroot
? NULL
: spa_strdup(spa_config_path
);
635 list_insert_head(&spa
->spa_config_list
, dp
);
637 VERIFY(nvlist_alloc(&spa
->spa_load_info
, NV_UNIQUE_NAME
,
640 if (config
!= NULL
) {
643 if (nvlist_lookup_nvlist(config
, ZPOOL_CONFIG_FEATURES_FOR_READ
,
645 VERIFY(nvlist_dup(features
, &spa
->spa_label_features
,
649 VERIFY(nvlist_dup(config
, &spa
->spa_config
, 0) == 0);
652 if (spa
->spa_label_features
== NULL
) {
653 VERIFY(nvlist_alloc(&spa
->spa_label_features
, NV_UNIQUE_NAME
,
657 spa
->spa_debug
= ((zfs_flags
& ZFS_DEBUG_SPA
) != 0);
659 spa
->spa_min_ashift
= INT_MAX
;
660 spa
->spa_max_ashift
= 0;
662 /* Reset cached value */
663 spa
->spa_dedup_dspace
= ~0ULL;
666 * As a pool is being created, treat all features as disabled by
667 * setting SPA_FEATURE_DISABLED for all entries in the feature
670 for (int i
= 0; i
< SPA_FEATURES
; i
++) {
671 spa
->spa_feat_refcount_cache
[i
] = SPA_FEATURE_DISABLED
;
678 * Removes a spa_t from the namespace, freeing up any memory used. Requires
679 * spa_namespace_lock. This is called only after the spa_t has been closed and
683 spa_remove(spa_t
*spa
)
685 spa_config_dirent_t
*dp
;
687 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
688 ASSERT(spa
->spa_state
== POOL_STATE_UNINITIALIZED
);
689 ASSERT3U(refcount_count(&spa
->spa_refcount
), ==, 0);
691 nvlist_free(spa
->spa_config_splitting
);
693 avl_remove(&spa_namespace_avl
, spa
);
694 cv_broadcast(&spa_namespace_cv
);
697 spa_strfree(spa
->spa_root
);
699 while ((dp
= list_head(&spa
->spa_config_list
)) != NULL
) {
700 list_remove(&spa
->spa_config_list
, dp
);
701 if (dp
->scd_path
!= NULL
)
702 spa_strfree(dp
->scd_path
);
703 kmem_free(dp
, sizeof (spa_config_dirent_t
));
706 avl_destroy(&spa
->spa_alloc_tree
);
707 list_destroy(&spa
->spa_config_list
);
709 nvlist_free(spa
->spa_label_features
);
710 nvlist_free(spa
->spa_load_info
);
711 nvlist_free(spa
->spa_feat_stats
);
712 spa_config_set(spa
, NULL
);
714 refcount_destroy(&spa
->spa_refcount
);
716 spa_stats_destroy(spa
);
717 spa_config_lock_destroy(spa
);
719 for (int t
= 0; t
< TXG_SIZE
; t
++)
720 bplist_destroy(&spa
->spa_free_bplist
[t
]);
722 zio_checksum_templates_free(spa
);
724 cv_destroy(&spa
->spa_async_cv
);
725 cv_destroy(&spa
->spa_evicting_os_cv
);
726 cv_destroy(&spa
->spa_proc_cv
);
727 cv_destroy(&spa
->spa_scrub_io_cv
);
728 cv_destroy(&spa
->spa_suspend_cv
);
730 mutex_destroy(&spa
->spa_alloc_lock
);
731 mutex_destroy(&spa
->spa_async_lock
);
732 mutex_destroy(&spa
->spa_errlist_lock
);
733 mutex_destroy(&spa
->spa_errlog_lock
);
734 mutex_destroy(&spa
->spa_evicting_os_lock
);
735 mutex_destroy(&spa
->spa_history_lock
);
736 mutex_destroy(&spa
->spa_proc_lock
);
737 mutex_destroy(&spa
->spa_props_lock
);
738 mutex_destroy(&spa
->spa_cksum_tmpls_lock
);
739 mutex_destroy(&spa
->spa_scrub_lock
);
740 mutex_destroy(&spa
->spa_suspend_lock
);
741 mutex_destroy(&spa
->spa_vdev_top_lock
);
742 mutex_destroy(&spa
->spa_feat_stats_lock
);
744 kmem_free(spa
, sizeof (spa_t
));
748 * Given a pool, return the next pool in the namespace, or NULL if there is
749 * none. If 'prev' is NULL, return the first pool.
752 spa_next(spa_t
*prev
)
754 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
757 return (AVL_NEXT(&spa_namespace_avl
, prev
));
759 return (avl_first(&spa_namespace_avl
));
763 * ==========================================================================
764 * SPA refcount functions
765 * ==========================================================================
769 * Add a reference to the given spa_t. Must have at least one reference, or
770 * have the namespace lock held.
773 spa_open_ref(spa_t
*spa
, void *tag
)
775 ASSERT(refcount_count(&spa
->spa_refcount
) >= spa
->spa_minref
||
776 MUTEX_HELD(&spa_namespace_lock
));
777 (void) refcount_add(&spa
->spa_refcount
, tag
);
781 * Remove a reference to the given spa_t. Must have at least one reference, or
782 * have the namespace lock held.
785 spa_close(spa_t
*spa
, void *tag
)
787 ASSERT(refcount_count(&spa
->spa_refcount
) > spa
->spa_minref
||
788 MUTEX_HELD(&spa_namespace_lock
));
789 (void) refcount_remove(&spa
->spa_refcount
, tag
);
793 * Remove a reference to the given spa_t held by a dsl dir that is
794 * being asynchronously released. Async releases occur from a taskq
795 * performing eviction of dsl datasets and dirs. The namespace lock
796 * isn't held and the hold by the object being evicted may contribute to
797 * spa_minref (e.g. dataset or directory released during pool export),
798 * so the asserts in spa_close() do not apply.
801 spa_async_close(spa_t
*spa
, void *tag
)
803 (void) refcount_remove(&spa
->spa_refcount
, tag
);
807 * Check to see if the spa refcount is zero. Must be called with
808 * spa_namespace_lock held. We really compare against spa_minref, which is the
809 * number of references acquired when opening a pool
812 spa_refcount_zero(spa_t
*spa
)
814 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
816 return (refcount_count(&spa
->spa_refcount
) == spa
->spa_minref
);
820 * ==========================================================================
821 * SPA spare and l2cache tracking
822 * ==========================================================================
826 * Hot spares and cache devices are tracked using the same code below,
827 * for 'auxiliary' devices.
830 typedef struct spa_aux
{
838 spa_aux_compare(const void *a
, const void *b
)
840 const spa_aux_t
*sa
= (const spa_aux_t
*)a
;
841 const spa_aux_t
*sb
= (const spa_aux_t
*)b
;
843 return (AVL_CMP(sa
->aux_guid
, sb
->aux_guid
));
847 spa_aux_add(vdev_t
*vd
, avl_tree_t
*avl
)
853 search
.aux_guid
= vd
->vdev_guid
;
854 if ((aux
= avl_find(avl
, &search
, &where
)) != NULL
) {
857 aux
= kmem_zalloc(sizeof (spa_aux_t
), KM_SLEEP
);
858 aux
->aux_guid
= vd
->vdev_guid
;
860 avl_insert(avl
, aux
, where
);
865 spa_aux_remove(vdev_t
*vd
, avl_tree_t
*avl
)
871 search
.aux_guid
= vd
->vdev_guid
;
872 aux
= avl_find(avl
, &search
, &where
);
876 if (--aux
->aux_count
== 0) {
877 avl_remove(avl
, aux
);
878 kmem_free(aux
, sizeof (spa_aux_t
));
879 } else if (aux
->aux_pool
== spa_guid(vd
->vdev_spa
)) {
880 aux
->aux_pool
= 0ULL;
885 spa_aux_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
, avl_tree_t
*avl
)
887 spa_aux_t search
, *found
;
889 search
.aux_guid
= guid
;
890 found
= avl_find(avl
, &search
, NULL
);
894 *pool
= found
->aux_pool
;
901 *refcnt
= found
->aux_count
;
906 return (found
!= NULL
);
910 spa_aux_activate(vdev_t
*vd
, avl_tree_t
*avl
)
912 spa_aux_t search
, *found
;
915 search
.aux_guid
= vd
->vdev_guid
;
916 found
= avl_find(avl
, &search
, &where
);
917 ASSERT(found
!= NULL
);
918 ASSERT(found
->aux_pool
== 0ULL);
920 found
->aux_pool
= spa_guid(vd
->vdev_spa
);
924 * Spares are tracked globally due to the following constraints:
926 * - A spare may be part of multiple pools.
927 * - A spare may be added to a pool even if it's actively in use within
929 * - A spare in use in any pool can only be the source of a replacement if
930 * the target is a spare in the same pool.
932 * We keep track of all spares on the system through the use of a reference
933 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
934 * spare, then we bump the reference count in the AVL tree. In addition, we set
935 * the 'vdev_isspare' member to indicate that the device is a spare (active or
936 * inactive). When a spare is made active (used to replace a device in the
937 * pool), we also keep track of which pool its been made a part of.
939 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
940 * called under the spa_namespace lock as part of vdev reconfiguration. The
941 * separate spare lock exists for the status query path, which does not need to
942 * be completely consistent with respect to other vdev configuration changes.
946 spa_spare_compare(const void *a
, const void *b
)
948 return (spa_aux_compare(a
, b
));
952 spa_spare_add(vdev_t
*vd
)
954 mutex_enter(&spa_spare_lock
);
955 ASSERT(!vd
->vdev_isspare
);
956 spa_aux_add(vd
, &spa_spare_avl
);
957 vd
->vdev_isspare
= B_TRUE
;
958 mutex_exit(&spa_spare_lock
);
962 spa_spare_remove(vdev_t
*vd
)
964 mutex_enter(&spa_spare_lock
);
965 ASSERT(vd
->vdev_isspare
);
966 spa_aux_remove(vd
, &spa_spare_avl
);
967 vd
->vdev_isspare
= B_FALSE
;
968 mutex_exit(&spa_spare_lock
);
972 spa_spare_exists(uint64_t guid
, uint64_t *pool
, int *refcnt
)
976 mutex_enter(&spa_spare_lock
);
977 found
= spa_aux_exists(guid
, pool
, refcnt
, &spa_spare_avl
);
978 mutex_exit(&spa_spare_lock
);
984 spa_spare_activate(vdev_t
*vd
)
986 mutex_enter(&spa_spare_lock
);
987 ASSERT(vd
->vdev_isspare
);
988 spa_aux_activate(vd
, &spa_spare_avl
);
989 mutex_exit(&spa_spare_lock
);
993 * Level 2 ARC devices are tracked globally for the same reasons as spares.
994 * Cache devices currently only support one pool per cache device, and so
995 * for these devices the aux reference count is currently unused beyond 1.
999 spa_l2cache_compare(const void *a
, const void *b
)
1001 return (spa_aux_compare(a
, b
));
1005 spa_l2cache_add(vdev_t
*vd
)
1007 mutex_enter(&spa_l2cache_lock
);
1008 ASSERT(!vd
->vdev_isl2cache
);
1009 spa_aux_add(vd
, &spa_l2cache_avl
);
1010 vd
->vdev_isl2cache
= B_TRUE
;
1011 mutex_exit(&spa_l2cache_lock
);
1015 spa_l2cache_remove(vdev_t
*vd
)
1017 mutex_enter(&spa_l2cache_lock
);
1018 ASSERT(vd
->vdev_isl2cache
);
1019 spa_aux_remove(vd
, &spa_l2cache_avl
);
1020 vd
->vdev_isl2cache
= B_FALSE
;
1021 mutex_exit(&spa_l2cache_lock
);
1025 spa_l2cache_exists(uint64_t guid
, uint64_t *pool
)
1029 mutex_enter(&spa_l2cache_lock
);
1030 found
= spa_aux_exists(guid
, pool
, NULL
, &spa_l2cache_avl
);
1031 mutex_exit(&spa_l2cache_lock
);
1037 spa_l2cache_activate(vdev_t
*vd
)
1039 mutex_enter(&spa_l2cache_lock
);
1040 ASSERT(vd
->vdev_isl2cache
);
1041 spa_aux_activate(vd
, &spa_l2cache_avl
);
1042 mutex_exit(&spa_l2cache_lock
);
1046 * ==========================================================================
1048 * ==========================================================================
1052 * Lock the given spa_t for the purpose of adding or removing a vdev.
1053 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
1054 * It returns the next transaction group for the spa_t.
1057 spa_vdev_enter(spa_t
*spa
)
1059 mutex_enter(&spa
->spa_vdev_top_lock
);
1060 mutex_enter(&spa_namespace_lock
);
1061 return (spa_vdev_config_enter(spa
));
1065 * Internal implementation for spa_vdev_enter(). Used when a vdev
1066 * operation requires multiple syncs (i.e. removing a device) while
1067 * keeping the spa_namespace_lock held.
1070 spa_vdev_config_enter(spa_t
*spa
)
1072 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1074 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1076 return (spa_last_synced_txg(spa
) + 1);
1080 * Used in combination with spa_vdev_config_enter() to allow the syncing
1081 * of multiple transactions without releasing the spa_namespace_lock.
1084 spa_vdev_config_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
, char *tag
)
1086 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1088 int config_changed
= B_FALSE
;
1090 ASSERT(txg
> spa_last_synced_txg(spa
));
1092 spa
->spa_pending_vdev
= NULL
;
1095 * Reassess the DTLs.
1097 vdev_dtl_reassess(spa
->spa_root_vdev
, 0, 0, B_FALSE
);
1099 if (error
== 0 && !list_is_empty(&spa
->spa_config_dirty_list
)) {
1100 config_changed
= B_TRUE
;
1101 spa
->spa_config_generation
++;
1105 * Verify the metaslab classes.
1107 ASSERT(metaslab_class_validate(spa_normal_class(spa
)) == 0);
1108 ASSERT(metaslab_class_validate(spa_log_class(spa
)) == 0);
1110 spa_config_exit(spa
, SCL_ALL
, spa
);
1113 * Panic the system if the specified tag requires it. This
1114 * is useful for ensuring that configurations are updated
1117 if (zio_injection_enabled
)
1118 zio_handle_panic_injection(spa
, tag
, 0);
1121 * Note: this txg_wait_synced() is important because it ensures
1122 * that there won't be more than one config change per txg.
1123 * This allows us to use the txg as the generation number.
1126 txg_wait_synced(spa
->spa_dsl_pool
, txg
);
1129 ASSERT(!vd
->vdev_detached
|| vd
->vdev_dtl_sm
== NULL
);
1130 spa_config_enter(spa
, SCL_ALL
, spa
, RW_WRITER
);
1132 spa_config_exit(spa
, SCL_ALL
, spa
);
1136 * If the config changed, update the config cache.
1139 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1143 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
1144 * locking of spa_vdev_enter(), we also want make sure the transactions have
1145 * synced to disk, and then update the global configuration cache with the new
1149 spa_vdev_exit(spa_t
*spa
, vdev_t
*vd
, uint64_t txg
, int error
)
1151 spa_vdev_config_exit(spa
, vd
, txg
, error
, FTAG
);
1152 mutex_exit(&spa_namespace_lock
);
1153 mutex_exit(&spa
->spa_vdev_top_lock
);
1159 * Lock the given spa_t for the purpose of changing vdev state.
1162 spa_vdev_state_enter(spa_t
*spa
, int oplocks
)
1164 int locks
= SCL_STATE_ALL
| oplocks
;
1167 * Root pools may need to read of the underlying devfs filesystem
1168 * when opening up a vdev. Unfortunately if we're holding the
1169 * SCL_ZIO lock it will result in a deadlock when we try to issue
1170 * the read from the root filesystem. Instead we "prefetch"
1171 * the associated vnodes that we need prior to opening the
1172 * underlying devices and cache them so that we can prevent
1173 * any I/O when we are doing the actual open.
1175 if (spa_is_root(spa
)) {
1176 int low
= locks
& ~(SCL_ZIO
- 1);
1177 int high
= locks
& ~low
;
1179 spa_config_enter(spa
, high
, spa
, RW_WRITER
);
1180 vdev_hold(spa
->spa_root_vdev
);
1181 spa_config_enter(spa
, low
, spa
, RW_WRITER
);
1183 spa_config_enter(spa
, locks
, spa
, RW_WRITER
);
1185 spa
->spa_vdev_locks
= locks
;
1189 spa_vdev_state_exit(spa_t
*spa
, vdev_t
*vd
, int error
)
1191 boolean_t config_changed
= B_FALSE
;
1194 if (vd
== NULL
|| vd
== spa
->spa_root_vdev
) {
1195 vdev_top
= spa
->spa_root_vdev
;
1197 vdev_top
= vd
->vdev_top
;
1200 if (vd
!= NULL
|| error
== 0)
1201 vdev_dtl_reassess(vdev_top
, 0, 0, B_FALSE
);
1204 if (vd
!= spa
->spa_root_vdev
)
1205 vdev_state_dirty(vdev_top
);
1207 config_changed
= B_TRUE
;
1208 spa
->spa_config_generation
++;
1211 if (spa_is_root(spa
))
1212 vdev_rele(spa
->spa_root_vdev
);
1214 ASSERT3U(spa
->spa_vdev_locks
, >=, SCL_STATE_ALL
);
1215 spa_config_exit(spa
, spa
->spa_vdev_locks
, spa
);
1218 * If anything changed, wait for it to sync. This ensures that,
1219 * from the system administrator's perspective, zpool(1M) commands
1220 * are synchronous. This is important for things like zpool offline:
1221 * when the command completes, you expect no further I/O from ZFS.
1224 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1227 * If the config changed, update the config cache.
1229 if (config_changed
) {
1230 mutex_enter(&spa_namespace_lock
);
1231 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1232 mutex_exit(&spa_namespace_lock
);
1239 * ==========================================================================
1240 * Miscellaneous functions
1241 * ==========================================================================
1245 spa_activate_mos_feature(spa_t
*spa
, const char *feature
, dmu_tx_t
*tx
)
1247 if (!nvlist_exists(spa
->spa_label_features
, feature
)) {
1248 fnvlist_add_boolean(spa
->spa_label_features
, feature
);
1250 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't
1251 * dirty the vdev config because lock SCL_CONFIG is not held.
1252 * Thankfully, in this case we don't need to dirty the config
1253 * because it will be written out anyway when we finish
1254 * creating the pool.
1256 if (tx
->tx_txg
!= TXG_INITIAL
)
1257 vdev_config_dirty(spa
->spa_root_vdev
);
1262 spa_deactivate_mos_feature(spa_t
*spa
, const char *feature
)
1264 if (nvlist_remove_all(spa
->spa_label_features
, feature
) == 0)
1265 vdev_config_dirty(spa
->spa_root_vdev
);
1272 spa_rename(const char *name
, const char *newname
)
1278 * Lookup the spa_t and grab the config lock for writing. We need to
1279 * actually open the pool so that we can sync out the necessary labels.
1280 * It's OK to call spa_open() with the namespace lock held because we
1281 * allow recursive calls for other reasons.
1283 mutex_enter(&spa_namespace_lock
);
1284 if ((err
= spa_open(name
, &spa
, FTAG
)) != 0) {
1285 mutex_exit(&spa_namespace_lock
);
1289 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1291 avl_remove(&spa_namespace_avl
, spa
);
1292 (void) strlcpy(spa
->spa_name
, newname
, sizeof (spa
->spa_name
));
1293 avl_add(&spa_namespace_avl
, spa
);
1296 * Sync all labels to disk with the new names by marking the root vdev
1297 * dirty and waiting for it to sync. It will pick up the new pool name
1300 vdev_config_dirty(spa
->spa_root_vdev
);
1302 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1304 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1307 * Sync the updated config cache.
1309 spa_config_sync(spa
, B_FALSE
, B_TRUE
);
1311 spa_close(spa
, FTAG
);
1313 mutex_exit(&spa_namespace_lock
);
1319 * Return the spa_t associated with given pool_guid, if it exists. If
1320 * device_guid is non-zero, determine whether the pool exists *and* contains
1321 * a device with the specified device_guid.
1324 spa_by_guid(uint64_t pool_guid
, uint64_t device_guid
)
1327 avl_tree_t
*t
= &spa_namespace_avl
;
1329 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1331 for (spa
= avl_first(t
); spa
!= NULL
; spa
= AVL_NEXT(t
, spa
)) {
1332 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1334 if (spa
->spa_root_vdev
== NULL
)
1336 if (spa_guid(spa
) == pool_guid
) {
1337 if (device_guid
== 0)
1340 if (vdev_lookup_by_guid(spa
->spa_root_vdev
,
1341 device_guid
) != NULL
)
1345 * Check any devices we may be in the process of adding.
1347 if (spa
->spa_pending_vdev
) {
1348 if (vdev_lookup_by_guid(spa
->spa_pending_vdev
,
1349 device_guid
) != NULL
)
1359 * Determine whether a pool with the given pool_guid exists.
1362 spa_guid_exists(uint64_t pool_guid
, uint64_t device_guid
)
1364 return (spa_by_guid(pool_guid
, device_guid
) != NULL
);
1368 spa_strdup(const char *s
)
1374 new = kmem_alloc(len
+ 1, KM_SLEEP
);
1382 spa_strfree(char *s
)
1384 kmem_free(s
, strlen(s
) + 1);
1388 spa_get_random(uint64_t range
)
1397 (void) random_get_pseudo_bytes((void *)&r
, sizeof (uint64_t));
1403 spa_generate_guid(spa_t
*spa
)
1405 uint64_t guid
= spa_get_random(-1ULL);
1408 while (guid
== 0 || spa_guid_exists(spa_guid(spa
), guid
))
1409 guid
= spa_get_random(-1ULL);
1411 while (guid
== 0 || spa_guid_exists(guid
, 0))
1412 guid
= spa_get_random(-1ULL);
1419 snprintf_blkptr(char *buf
, size_t buflen
, const blkptr_t
*bp
)
1422 char *checksum
= NULL
;
1423 char *compress
= NULL
;
1424 char *crypt_type
= NULL
;
1427 if (BP_GET_TYPE(bp
) & DMU_OT_NEWTYPE
) {
1428 dmu_object_byteswap_t bswap
=
1429 DMU_OT_BYTESWAP(BP_GET_TYPE(bp
));
1430 (void) snprintf(type
, sizeof (type
), "bswap %s %s",
1431 DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) ?
1432 "metadata" : "data",
1433 dmu_ot_byteswap
[bswap
].ob_name
);
1435 (void) strlcpy(type
, dmu_ot
[BP_GET_TYPE(bp
)].ot_name
,
1438 if (BP_IS_ENCRYPTED(bp
)) {
1439 crypt_type
= "encrypted";
1440 } else if (BP_IS_AUTHENTICATED(bp
)) {
1441 crypt_type
= "authenticated";
1442 } else if (BP_HAS_INDIRECT_MAC_CKSUM(bp
)) {
1443 crypt_type
= "indirect-MAC";
1445 crypt_type
= "unencrypted";
1447 if (!BP_IS_EMBEDDED(bp
)) {
1449 zio_checksum_table
[BP_GET_CHECKSUM(bp
)].ci_name
;
1451 compress
= zio_compress_table
[BP_GET_COMPRESS(bp
)].ci_name
;
1454 SNPRINTF_BLKPTR(snprintf
, ' ', buf
, buflen
, bp
, type
, checksum
,
1455 crypt_type
, compress
);
1459 spa_freeze(spa_t
*spa
)
1461 uint64_t freeze_txg
= 0;
1463 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
1464 if (spa
->spa_freeze_txg
== UINT64_MAX
) {
1465 freeze_txg
= spa_last_synced_txg(spa
) + TXG_SIZE
;
1466 spa
->spa_freeze_txg
= freeze_txg
;
1468 spa_config_exit(spa
, SCL_ALL
, FTAG
);
1469 if (freeze_txg
!= 0)
1470 txg_wait_synced(spa_get_dsl(spa
), freeze_txg
);
1474 zfs_panic_recover(const char *fmt
, ...)
1479 vcmn_err(zfs_recover
? CE_WARN
: CE_PANIC
, fmt
, adx
);
1484 * This is a stripped-down version of strtoull, suitable only for converting
1485 * lowercase hexadecimal numbers that don't overflow.
1488 zfs_strtonum(const char *str
, char **nptr
)
1494 while ((c
= *str
) != '\0') {
1495 if (c
>= '0' && c
<= '9')
1497 else if (c
>= 'a' && c
<= 'f')
1498 digit
= 10 + c
- 'a';
1509 *nptr
= (char *)str
;
1515 * ==========================================================================
1516 * Accessor functions
1517 * ==========================================================================
1521 spa_shutting_down(spa_t
*spa
)
1523 return (spa
->spa_async_suspended
);
1527 spa_get_dsl(spa_t
*spa
)
1529 return (spa
->spa_dsl_pool
);
1533 spa_is_initializing(spa_t
*spa
)
1535 return (spa
->spa_is_initializing
);
1539 spa_get_rootblkptr(spa_t
*spa
)
1541 return (&spa
->spa_ubsync
.ub_rootbp
);
1545 spa_set_rootblkptr(spa_t
*spa
, const blkptr_t
*bp
)
1547 spa
->spa_uberblock
.ub_rootbp
= *bp
;
1551 spa_altroot(spa_t
*spa
, char *buf
, size_t buflen
)
1553 if (spa
->spa_root
== NULL
)
1556 (void) strncpy(buf
, spa
->spa_root
, buflen
);
1560 spa_sync_pass(spa_t
*spa
)
1562 return (spa
->spa_sync_pass
);
1566 spa_name(spa_t
*spa
)
1568 return (spa
->spa_name
);
1572 spa_guid(spa_t
*spa
)
1574 dsl_pool_t
*dp
= spa_get_dsl(spa
);
1578 * If we fail to parse the config during spa_load(), we can go through
1579 * the error path (which posts an ereport) and end up here with no root
1580 * vdev. We stash the original pool guid in 'spa_config_guid' to handle
1583 if (spa
->spa_root_vdev
== NULL
)
1584 return (spa
->spa_config_guid
);
1586 guid
= spa
->spa_last_synced_guid
!= 0 ?
1587 spa
->spa_last_synced_guid
: spa
->spa_root_vdev
->vdev_guid
;
1590 * Return the most recently synced out guid unless we're
1591 * in syncing context.
1593 if (dp
&& dsl_pool_sync_context(dp
))
1594 return (spa
->spa_root_vdev
->vdev_guid
);
1600 spa_load_guid(spa_t
*spa
)
1603 * This is a GUID that exists solely as a reference for the
1604 * purposes of the arc. It is generated at load time, and
1605 * is never written to persistent storage.
1607 return (spa
->spa_load_guid
);
1611 spa_last_synced_txg(spa_t
*spa
)
1613 return (spa
->spa_ubsync
.ub_txg
);
1617 spa_first_txg(spa_t
*spa
)
1619 return (spa
->spa_first_txg
);
1623 spa_syncing_txg(spa_t
*spa
)
1625 return (spa
->spa_syncing_txg
);
1629 * Return the last txg where data can be dirtied. The final txgs
1630 * will be used to just clear out any deferred frees that remain.
1633 spa_final_dirty_txg(spa_t
*spa
)
1635 return (spa
->spa_final_txg
- TXG_DEFER_SIZE
);
1639 spa_state(spa_t
*spa
)
1641 return (spa
->spa_state
);
1645 spa_load_state(spa_t
*spa
)
1647 return (spa
->spa_load_state
);
1651 spa_freeze_txg(spa_t
*spa
)
1653 return (spa
->spa_freeze_txg
);
1657 * Return the inflated asize for a logical write in bytes. This is used by the
1658 * DMU to calculate the space a logical write will require on disk.
1659 * If lsize is smaller than the largest physical block size allocatable on this
1660 * pool we use its value instead, since the write will end up using the whole
1664 spa_get_worst_case_asize(spa_t
*spa
, uint64_t lsize
)
1667 return (0); /* No inflation needed */
1668 return (MAX(lsize
, 1 << spa
->spa_max_ashift
) * spa_asize_inflation
);
1672 * Return the amount of slop space in bytes. It is 1/32 of the pool (3.2%),
1673 * or at least 128MB, unless that would cause it to be more than half the
1676 * See the comment above spa_slop_shift for details.
1679 spa_get_slop_space(spa_t
*spa
)
1681 uint64_t space
= spa_get_dspace(spa
);
1682 return (MAX(space
>> spa_slop_shift
, MIN(space
>> 1, spa_min_slop
)));
1686 spa_get_dspace(spa_t
*spa
)
1688 return (spa
->spa_dspace
);
1692 spa_update_dspace(spa_t
*spa
)
1694 spa
->spa_dspace
= metaslab_class_get_dspace(spa_normal_class(spa
)) +
1695 ddt_get_dedup_dspace(spa
);
1699 * Return the failure mode that has been set to this pool. The default
1700 * behavior will be to block all I/Os when a complete failure occurs.
1703 spa_get_failmode(spa_t
*spa
)
1705 return (spa
->spa_failmode
);
1709 spa_suspended(spa_t
*spa
)
1711 return (spa
->spa_suspended
!= ZIO_SUSPEND_NONE
);
1715 spa_version(spa_t
*spa
)
1717 return (spa
->spa_ubsync
.ub_version
);
1721 spa_deflate(spa_t
*spa
)
1723 return (spa
->spa_deflate
);
1727 spa_normal_class(spa_t
*spa
)
1729 return (spa
->spa_normal_class
);
1733 spa_log_class(spa_t
*spa
)
1735 return (spa
->spa_log_class
);
1739 spa_evicting_os_register(spa_t
*spa
, objset_t
*os
)
1741 mutex_enter(&spa
->spa_evicting_os_lock
);
1742 list_insert_head(&spa
->spa_evicting_os_list
, os
);
1743 mutex_exit(&spa
->spa_evicting_os_lock
);
1747 spa_evicting_os_deregister(spa_t
*spa
, objset_t
*os
)
1749 mutex_enter(&spa
->spa_evicting_os_lock
);
1750 list_remove(&spa
->spa_evicting_os_list
, os
);
1751 cv_broadcast(&spa
->spa_evicting_os_cv
);
1752 mutex_exit(&spa
->spa_evicting_os_lock
);
1756 spa_evicting_os_wait(spa_t
*spa
)
1758 mutex_enter(&spa
->spa_evicting_os_lock
);
1759 while (!list_is_empty(&spa
->spa_evicting_os_list
))
1760 cv_wait(&spa
->spa_evicting_os_cv
, &spa
->spa_evicting_os_lock
);
1761 mutex_exit(&spa
->spa_evicting_os_lock
);
1763 dmu_buf_user_evict_wait();
1767 spa_max_replication(spa_t
*spa
)
1770 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
1771 * handle BPs with more than one DVA allocated. Set our max
1772 * replication level accordingly.
1774 if (spa_version(spa
) < SPA_VERSION_DITTO_BLOCKS
)
1776 return (MIN(SPA_DVAS_PER_BP
, spa_max_replication_override
));
1780 spa_prev_software_version(spa_t
*spa
)
1782 return (spa
->spa_prev_software_version
);
1786 spa_deadman_synctime(spa_t
*spa
)
1788 return (spa
->spa_deadman_synctime
);
1792 spa_deadman_ziotime(spa_t
*spa
)
1794 return (spa
->spa_deadman_ziotime
);
1798 spa_get_deadman_failmode(spa_t
*spa
)
1800 return (spa
->spa_deadman_failmode
);
1804 spa_set_deadman_failmode(spa_t
*spa
, const char *failmode
)
1806 if (strcmp(failmode
, "wait") == 0)
1807 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_WAIT
;
1808 else if (strcmp(failmode
, "continue") == 0)
1809 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_CONTINUE
;
1810 else if (strcmp(failmode
, "panic") == 0)
1811 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_PANIC
;
1813 spa
->spa_deadman_failmode
= ZIO_FAILURE_MODE_WAIT
;
1817 dva_get_dsize_sync(spa_t
*spa
, const dva_t
*dva
)
1819 uint64_t asize
= DVA_GET_ASIZE(dva
);
1820 uint64_t dsize
= asize
;
1822 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
1824 if (asize
!= 0 && spa
->spa_deflate
) {
1825 vdev_t
*vd
= vdev_lookup_top(spa
, DVA_GET_VDEV(dva
));
1827 dsize
= (asize
>> SPA_MINBLOCKSHIFT
) *
1828 vd
->vdev_deflate_ratio
;
1835 bp_get_dsize_sync(spa_t
*spa
, const blkptr_t
*bp
)
1839 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
1840 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
1846 bp_get_dsize(spa_t
*spa
, const blkptr_t
*bp
)
1850 spa_config_enter(spa
, SCL_VDEV
, FTAG
, RW_READER
);
1852 for (int d
= 0; d
< BP_GET_NDVAS(bp
); d
++)
1853 dsize
+= dva_get_dsize_sync(spa
, &bp
->blk_dva
[d
]);
1855 spa_config_exit(spa
, SCL_VDEV
, FTAG
);
1861 * ==========================================================================
1862 * Initialization and Termination
1863 * ==========================================================================
1867 spa_name_compare(const void *a1
, const void *a2
)
1869 const spa_t
*s1
= a1
;
1870 const spa_t
*s2
= a2
;
1873 s
= strcmp(s1
->spa_name
, s2
->spa_name
);
1875 return (AVL_ISIGN(s
));
1887 mutex_init(&spa_namespace_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1888 mutex_init(&spa_spare_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1889 mutex_init(&spa_l2cache_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1890 cv_init(&spa_namespace_cv
, NULL
, CV_DEFAULT
, NULL
);
1892 avl_create(&spa_namespace_avl
, spa_name_compare
, sizeof (spa_t
),
1893 offsetof(spa_t
, spa_avl
));
1895 avl_create(&spa_spare_avl
, spa_spare_compare
, sizeof (spa_aux_t
),
1896 offsetof(spa_aux_t
, aux_avl
));
1898 avl_create(&spa_l2cache_avl
, spa_l2cache_compare
, sizeof (spa_aux_t
),
1899 offsetof(spa_aux_t
, aux_avl
));
1901 spa_mode_global
= mode
;
1904 if (spa_mode_global
!= FREAD
&& dprintf_find_string("watch")) {
1905 struct sigaction sa
;
1907 sa
.sa_flags
= SA_SIGINFO
;
1908 sigemptyset(&sa
.sa_mask
);
1909 sa
.sa_sigaction
= arc_buf_sigsegv
;
1911 if (sigaction(SIGSEGV
, &sa
, NULL
) == -1) {
1912 perror("could not enable watchpoints: "
1913 "sigaction(SIGSEGV, ...) = ");
1924 metaslab_alloc_trace_init();
1929 vdev_cache_stat_init();
1930 vdev_mirror_stat_init();
1931 vdev_raidz_math_init();
1935 zpool_feature_init();
1950 vdev_cache_stat_fini();
1951 vdev_mirror_stat_fini();
1952 vdev_raidz_math_fini();
1957 metaslab_alloc_trace_fini();
1965 avl_destroy(&spa_namespace_avl
);
1966 avl_destroy(&spa_spare_avl
);
1967 avl_destroy(&spa_l2cache_avl
);
1969 cv_destroy(&spa_namespace_cv
);
1970 mutex_destroy(&spa_namespace_lock
);
1971 mutex_destroy(&spa_spare_lock
);
1972 mutex_destroy(&spa_l2cache_lock
);
1976 * Return whether this pool has slogs. No locking needed.
1977 * It's not a problem if the wrong answer is returned as it's only for
1978 * performance and not correctness
1981 spa_has_slogs(spa_t
*spa
)
1983 return (spa
->spa_log_class
->mc_rotor
!= NULL
);
1987 spa_get_log_state(spa_t
*spa
)
1989 return (spa
->spa_log_state
);
1993 spa_set_log_state(spa_t
*spa
, spa_log_state_t state
)
1995 spa
->spa_log_state
= state
;
1999 spa_is_root(spa_t
*spa
)
2001 return (spa
->spa_is_root
);
2005 spa_writeable(spa_t
*spa
)
2007 return (!!(spa
->spa_mode
& FWRITE
));
2011 * Returns true if there is a pending sync task in any of the current
2012 * syncing txg, the current quiescing txg, or the current open txg.
2015 spa_has_pending_synctask(spa_t
*spa
)
2017 return (!txg_all_lists_empty(&spa
->spa_dsl_pool
->dp_sync_tasks
));
2021 spa_mode(spa_t
*spa
)
2023 return (spa
->spa_mode
);
2027 spa_bootfs(spa_t
*spa
)
2029 return (spa
->spa_bootfs
);
2033 spa_delegation(spa_t
*spa
)
2035 return (spa
->spa_delegation
);
2039 spa_meta_objset(spa_t
*spa
)
2041 return (spa
->spa_meta_objset
);
2045 spa_dedup_checksum(spa_t
*spa
)
2047 return (spa
->spa_dedup_checksum
);
2051 * Reset pool scan stat per scan pass (or reboot).
2054 spa_scan_stat_init(spa_t
*spa
)
2056 /* data not stored on disk */
2057 spa
->spa_scan_pass_start
= gethrestime_sec();
2058 if (dsl_scan_is_paused_scrub(spa
->spa_dsl_pool
->dp_scan
))
2059 spa
->spa_scan_pass_scrub_pause
= spa
->spa_scan_pass_start
;
2061 spa
->spa_scan_pass_scrub_pause
= 0;
2062 spa
->spa_scan_pass_scrub_spent_paused
= 0;
2063 spa
->spa_scan_pass_exam
= 0;
2064 spa
->spa_scan_pass_issued
= 0;
2065 vdev_scan_stat_init(spa
->spa_root_vdev
);
2069 * Get scan stats for zpool status reports
2072 spa_scan_get_stats(spa_t
*spa
, pool_scan_stat_t
*ps
)
2074 dsl_scan_t
*scn
= spa
->spa_dsl_pool
? spa
->spa_dsl_pool
->dp_scan
: NULL
;
2076 if (scn
== NULL
|| scn
->scn_phys
.scn_func
== POOL_SCAN_NONE
)
2077 return (SET_ERROR(ENOENT
));
2078 bzero(ps
, sizeof (pool_scan_stat_t
));
2080 /* data stored on disk */
2081 ps
->pss_func
= scn
->scn_phys
.scn_func
;
2082 ps
->pss_state
= scn
->scn_phys
.scn_state
;
2083 ps
->pss_start_time
= scn
->scn_phys
.scn_start_time
;
2084 ps
->pss_end_time
= scn
->scn_phys
.scn_end_time
;
2085 ps
->pss_to_examine
= scn
->scn_phys
.scn_to_examine
;
2086 ps
->pss_examined
= scn
->scn_phys
.scn_examined
;
2087 ps
->pss_to_process
= scn
->scn_phys
.scn_to_process
;
2088 ps
->pss_processed
= scn
->scn_phys
.scn_processed
;
2089 ps
->pss_errors
= scn
->scn_phys
.scn_errors
;
2091 /* data not stored on disk */
2092 ps
->pss_pass_exam
= spa
->spa_scan_pass_exam
;
2093 ps
->pss_pass_start
= spa
->spa_scan_pass_start
;
2094 ps
->pss_pass_scrub_pause
= spa
->spa_scan_pass_scrub_pause
;
2095 ps
->pss_pass_scrub_spent_paused
= spa
->spa_scan_pass_scrub_spent_paused
;
2096 ps
->pss_pass_issued
= spa
->spa_scan_pass_issued
;
2098 scn
->scn_issued_before_pass
+ spa
->spa_scan_pass_issued
;
2104 spa_debug_enabled(spa_t
*spa
)
2106 return (spa
->spa_debug
);
2110 spa_maxblocksize(spa_t
*spa
)
2112 if (spa_feature_is_enabled(spa
, SPA_FEATURE_LARGE_BLOCKS
))
2113 return (SPA_MAXBLOCKSIZE
);
2115 return (SPA_OLD_MAXBLOCKSIZE
);
2119 spa_maxdnodesize(spa_t
*spa
)
2121 if (spa_feature_is_enabled(spa
, SPA_FEATURE_LARGE_DNODE
))
2122 return (DNODE_MAX_SIZE
);
2124 return (DNODE_MIN_SIZE
);
2128 spa_multihost(spa_t
*spa
)
2130 return (spa
->spa_multihost
? B_TRUE
: B_FALSE
);
2134 spa_get_hostid(void)
2136 unsigned long myhostid
;
2139 myhostid
= zone_get_hostid(NULL
);
2142 * We're emulating the system's hostid in userland, so
2143 * we can't use zone_get_hostid().
2145 (void) ddi_strtoul(hw_serial
, NULL
, 10, &myhostid
);
2146 #endif /* _KERNEL */
2151 #if defined(_KERNEL) && defined(HAVE_SPL)
2153 #include <linux/mod_compat.h>
2156 param_set_deadman_failmode(const char *val
, zfs_kernel_param_t
*kp
)
2162 return (SET_ERROR(-EINVAL
));
2164 if ((p
= strchr(val
, '\n')) != NULL
)
2167 if (strcmp(val
, "wait") != 0 && strcmp(val
, "continue") != 0 &&
2168 strcmp(val
, "panic"))
2169 return (SET_ERROR(-EINVAL
));
2171 mutex_enter(&spa_namespace_lock
);
2172 while ((spa
= spa_next(spa
)) != NULL
)
2173 spa_set_deadman_failmode(spa
, val
);
2174 mutex_exit(&spa_namespace_lock
);
2176 return (param_set_charp(val
, kp
));
2179 /* Namespace manipulation */
2180 EXPORT_SYMBOL(spa_lookup
);
2181 EXPORT_SYMBOL(spa_add
);
2182 EXPORT_SYMBOL(spa_remove
);
2183 EXPORT_SYMBOL(spa_next
);
2185 /* Refcount functions */
2186 EXPORT_SYMBOL(spa_open_ref
);
2187 EXPORT_SYMBOL(spa_close
);
2188 EXPORT_SYMBOL(spa_refcount_zero
);
2190 /* Pool configuration lock */
2191 EXPORT_SYMBOL(spa_config_tryenter
);
2192 EXPORT_SYMBOL(spa_config_enter
);
2193 EXPORT_SYMBOL(spa_config_exit
);
2194 EXPORT_SYMBOL(spa_config_held
);
2196 /* Pool vdev add/remove lock */
2197 EXPORT_SYMBOL(spa_vdev_enter
);
2198 EXPORT_SYMBOL(spa_vdev_exit
);
2200 /* Pool vdev state change lock */
2201 EXPORT_SYMBOL(spa_vdev_state_enter
);
2202 EXPORT_SYMBOL(spa_vdev_state_exit
);
2204 /* Accessor functions */
2205 EXPORT_SYMBOL(spa_shutting_down
);
2206 EXPORT_SYMBOL(spa_get_dsl
);
2207 EXPORT_SYMBOL(spa_get_rootblkptr
);
2208 EXPORT_SYMBOL(spa_set_rootblkptr
);
2209 EXPORT_SYMBOL(spa_altroot
);
2210 EXPORT_SYMBOL(spa_sync_pass
);
2211 EXPORT_SYMBOL(spa_name
);
2212 EXPORT_SYMBOL(spa_guid
);
2213 EXPORT_SYMBOL(spa_last_synced_txg
);
2214 EXPORT_SYMBOL(spa_first_txg
);
2215 EXPORT_SYMBOL(spa_syncing_txg
);
2216 EXPORT_SYMBOL(spa_version
);
2217 EXPORT_SYMBOL(spa_state
);
2218 EXPORT_SYMBOL(spa_load_state
);
2219 EXPORT_SYMBOL(spa_freeze_txg
);
2220 EXPORT_SYMBOL(spa_get_dspace
);
2221 EXPORT_SYMBOL(spa_update_dspace
);
2222 EXPORT_SYMBOL(spa_deflate
);
2223 EXPORT_SYMBOL(spa_normal_class
);
2224 EXPORT_SYMBOL(spa_log_class
);
2225 EXPORT_SYMBOL(spa_max_replication
);
2226 EXPORT_SYMBOL(spa_prev_software_version
);
2227 EXPORT_SYMBOL(spa_get_failmode
);
2228 EXPORT_SYMBOL(spa_suspended
);
2229 EXPORT_SYMBOL(spa_bootfs
);
2230 EXPORT_SYMBOL(spa_delegation
);
2231 EXPORT_SYMBOL(spa_meta_objset
);
2232 EXPORT_SYMBOL(spa_maxblocksize
);
2233 EXPORT_SYMBOL(spa_maxdnodesize
);
2235 /* Miscellaneous support routines */
2236 EXPORT_SYMBOL(spa_rename
);
2237 EXPORT_SYMBOL(spa_guid_exists
);
2238 EXPORT_SYMBOL(spa_strdup
);
2239 EXPORT_SYMBOL(spa_strfree
);
2240 EXPORT_SYMBOL(spa_get_random
);
2241 EXPORT_SYMBOL(spa_generate_guid
);
2242 EXPORT_SYMBOL(snprintf_blkptr
);
2243 EXPORT_SYMBOL(spa_freeze
);
2244 EXPORT_SYMBOL(spa_upgrade
);
2245 EXPORT_SYMBOL(spa_evict_all
);
2246 EXPORT_SYMBOL(spa_lookup_by_guid
);
2247 EXPORT_SYMBOL(spa_has_spare
);
2248 EXPORT_SYMBOL(dva_get_dsize_sync
);
2249 EXPORT_SYMBOL(bp_get_dsize_sync
);
2250 EXPORT_SYMBOL(bp_get_dsize
);
2251 EXPORT_SYMBOL(spa_has_slogs
);
2252 EXPORT_SYMBOL(spa_is_root
);
2253 EXPORT_SYMBOL(spa_writeable
);
2254 EXPORT_SYMBOL(spa_mode
);
2255 EXPORT_SYMBOL(spa_namespace_lock
);
2258 module_param(zfs_flags
, uint
, 0644);
2259 MODULE_PARM_DESC(zfs_flags
, "Set additional debugging flags");
2261 module_param(zfs_recover
, int, 0644);
2262 MODULE_PARM_DESC(zfs_recover
, "Set to attempt to recover from fatal errors");
2264 module_param(zfs_free_leak_on_eio
, int, 0644);
2265 MODULE_PARM_DESC(zfs_free_leak_on_eio
,
2266 "Set to ignore IO errors during free and permanently leak the space");
2268 module_param(zfs_deadman_synctime_ms
, ulong
, 0644);
2269 MODULE_PARM_DESC(zfs_deadman_synctime_ms
,
2270 "Pool sync expiration time in milliseconds");
2272 module_param(zfs_deadman_ziotime_ms
, ulong
, 0644);
2273 MODULE_PARM_DESC(zfs_deadman_ziotime_ms
,
2274 "IO expiration time in milliseconds");
2276 module_param(zfs_deadman_checktime_ms
, ulong
, 0644);
2277 MODULE_PARM_DESC(zfs_deadman_checktime_ms
,
2278 "Dead I/O check interval in milliseconds");
2280 module_param(zfs_deadman_enabled
, int, 0644);
2281 MODULE_PARM_DESC(zfs_deadman_enabled
, "Enable deadman timer");
2283 module_param_call(zfs_deadman_failmode
, param_set_deadman_failmode
,
2284 param_get_charp
, &zfs_deadman_failmode
, 0644);
2285 MODULE_PARM_DESC(zfs_deadman_failmode
, "Failmode for deadman timer");
2287 module_param(spa_asize_inflation
, int, 0644);
2288 MODULE_PARM_DESC(spa_asize_inflation
,
2289 "SPA size estimate multiplication factor");
2291 module_param(spa_slop_shift
, int, 0644);
2292 MODULE_PARM_DESC(spa_slop_shift
, "Reserved free space in pool");