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, 2018 by Delphix. All rights reserved.
24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
26 * Copyright 2013 Saso Kiselkov. All rights reserved.
27 * Copyright (c) 2017 Datto Inc.
28 * Copyright (c) 2017, Intel Corporation.
31 #include <sys/zfs_context.h>
32 #include <sys/spa_impl.h>
34 #include <sys/zio_checksum.h>
35 #include <sys/zio_compress.h>
37 #include <sys/dmu_tx.h>
40 #include <sys/vdev_impl.h>
41 #include <sys/vdev_file.h>
42 #include <sys/vdev_raidz.h>
43 #include <sys/metaslab.h>
44 #include <sys/uberblock_impl.h>
47 #include <sys/unique.h>
48 #include <sys/dsl_pool.h>
49 #include <sys/dsl_dir.h>
50 #include <sys/dsl_prop.h>
51 #include <sys/fm/util.h>
52 #include <sys/dsl_scan.h>
53 #include <sys/fs/zfs.h>
54 #include <sys/metaslab_impl.h>
57 #include <sys/kstat.h>
59 #include <sys/zfeature.h>
65 * There are four basic locks for managing spa_t structures:
67 * spa_namespace_lock (global mutex)
69 * This lock must be acquired to do any of the following:
71 * - Lookup a spa_t by name
72 * - Add or remove a spa_t from the namespace
73 * - Increase spa_refcount from non-zero
74 * - Check if spa_refcount is zero
76 * - add/remove/attach/detach devices
77 * - Held for the duration of create/destroy/import/export
79 * It does not need to handle recursion. A create or destroy may
80 * reference objects (files or zvols) in other pools, but by
81 * definition they must have an existing reference, and will never need
82 * to lookup a spa_t by name.
84 * spa_refcount (per-spa refcount_t protected by mutex)
86 * This reference count keep track of any active users of the spa_t. The
87 * spa_t cannot be destroyed or freed while this is non-zero. Internally,
88 * the refcount is never really 'zero' - opening a pool implicitly keeps
89 * some references in the DMU. Internally we check against spa_minref, but
90 * present the image of a zero/non-zero value to consumers.
92 * spa_config_lock[] (per-spa array of rwlocks)
94 * This protects the spa_t from config changes, and must be held in
95 * the following circumstances:
97 * - RW_READER to perform I/O to the spa
98 * - RW_WRITER to change the vdev config
100 * The locking order is fairly straightforward:
102 * spa_namespace_lock -> spa_refcount
104 * The namespace lock must be acquired to increase the refcount from 0
105 * or to check if it is zero.
107 * spa_refcount -> spa_config_lock[]
109 * There must be at least one valid reference on the spa_t to acquire
112 * spa_namespace_lock -> spa_config_lock[]
114 * The namespace lock must always be taken before the config lock.
117 * The spa_namespace_lock can be acquired directly and is globally visible.
119 * The namespace is manipulated using the following functions, all of which
120 * require the spa_namespace_lock to be held.
122 * spa_lookup() Lookup a spa_t by name.
124 * spa_add() Create a new spa_t in the namespace.
126 * spa_remove() Remove a spa_t from the namespace. This also
127 * frees up any memory associated with the spa_t.
129 * spa_next() Returns the next spa_t in the system, or the
130 * first if NULL is passed.
132 * spa_evict_all() Shutdown and remove all spa_t structures in
135 * spa_guid_exists() Determine whether a pool/device guid exists.
137 * The spa_refcount is manipulated using the following functions:
139 * spa_open_ref() Adds a reference to the given spa_t. Must be
140 * called with spa_namespace_lock held if the
141 * refcount is currently zero.
143 * spa_close() Remove a reference from the spa_t. This will
144 * not free the spa_t or remove it from the
145 * namespace. No locking is required.
147 * spa_refcount_zero() Returns true if the refcount is currently
148 * zero. Must be called with spa_namespace_lock
151 * The spa_config_lock[] is an array of rwlocks, ordered as follows:
152 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
153 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
155 * To read the configuration, it suffices to hold one of these locks as reader.
156 * To modify the configuration, you must hold all locks as writer. To modify
157 * vdev state without altering the vdev tree's topology (e.g. online/offline),
158 * you must hold SCL_STATE and SCL_ZIO as writer.
160 * We use these distinct config locks to avoid recursive lock entry.
161 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
162 * block allocations (SCL_ALLOC), which may require reading space maps
163 * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
165 * The spa config locks cannot be normal rwlocks because we need the
166 * ability to hand off ownership. For example, SCL_ZIO is acquired
167 * by the issuing thread and later released by an interrupt thread.
168 * They do, however, obey the usual write-wanted semantics to prevent
169 * writer (i.e. system administrator) starvation.
171 * The lock acquisition rules are as follows:
174 * Protects changes to the vdev tree topology, such as vdev
175 * add/remove/attach/detach. Protects the dirty config list
176 * (spa_config_dirty_list) and the set of spares and l2arc devices.
179 * Protects changes to pool state and vdev state, such as vdev
180 * online/offline/fault/degrade/clear. Protects the dirty state list
181 * (spa_state_dirty_list) and global pool state (spa_state).
184 * Protects changes to metaslab groups and classes.
185 * Held as reader by metaslab_alloc() and metaslab_claim().
188 * Held by bp-level zios (those which have no io_vd upon entry)
189 * to prevent changes to the vdev tree. The bp-level zio implicitly
190 * protects all of its vdev child zios, which do not hold SCL_ZIO.
193 * Protects changes to metaslab groups and classes.
194 * Held as reader by metaslab_free(). SCL_FREE is distinct from
195 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
196 * blocks in zio_done() while another i/o that holds either
197 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
200 * Held as reader to prevent changes to the vdev tree during trivial
201 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
202 * other locks, and lower than all of them, to ensure that it's safe
203 * to acquire regardless of caller context.
205 * In addition, the following rules apply:
207 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
208 * The lock ordering is SCL_CONFIG > spa_props_lock.
210 * (b) I/O operations on leaf vdevs. For any zio operation that takes
211 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
212 * or zio_write_phys() -- the caller must ensure that the config cannot
213 * cannot change in the interim, and that the vdev cannot be reopened.
214 * SCL_STATE as reader suffices for both.
216 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
218 * spa_vdev_enter() Acquire the namespace lock and the config lock
221 * spa_vdev_exit() Release the config lock, wait for all I/O
222 * to complete, sync the updated configs to the
223 * cache, and release the namespace lock.
225 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
226 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
227 * locking is, always, based on spa_namespace_lock and spa_config_lock[].
229 * spa_rename() is also implemented within this file since it requires
230 * manipulation of the namespace.
233 static avl_tree_t spa_namespace_avl;
234 kmutex_t spa_namespace_lock;
235 static kcondvar_t spa_namespace_cv;
236 int spa_max_replication_override = SPA_DVAS_PER_BP;
238 static kmutex_t spa_spare_lock;
239 static avl_tree_t spa_spare_avl;
240 static kmutex_t spa_l2cache_lock;
241 static avl_tree_t spa_l2cache_avl;
243 kmem_cache_t *spa_buffer_pool;
248 * Everything except dprintf, set_error, spa, and indirect_remap is on
249 * by default in debug builds.
251 int zfs_flags = ~(ZFS_DEBUG_DPRINTF | ZFS_DEBUG_SET_ERROR |
252 ZFS_DEBUG_INDIRECT_REMAP);
258 * zfs_recover can be set to nonzero to attempt to recover from
259 * otherwise-fatal errors, typically caused by on-disk corruption. When
260 * set, calls to zfs_panic_recover() will turn into warning messages.
261 * This should only be used as a last resort, as it typically results
262 * in leaked space, or worse.
264 int zfs_recover = B_FALSE;
267 * If destroy encounters an EIO while reading metadata (e.g. indirect
268 * blocks), space referenced by the missing metadata can not be freed.
269 * Normally this causes the background destroy to become "stalled", as
270 * it is unable to make forward progress. While in this stalled state,
271 * all remaining space to free from the error-encountering filesystem is
272 * "temporarily leaked". Set this flag to cause it to ignore the EIO,
273 * permanently leak the space from indirect blocks that can not be read,
274 * and continue to free everything else that it can.
276 * The default, "stalling" behavior is useful if the storage partially
277 * fails (i.e. some but not all i/os fail), and then later recovers. In
278 * this case, we will be able to continue pool operations while it is
279 * partially failed, and when it recovers, we can continue to free the
280 * space, with no leaks. However, note that this case is actually
283 * Typically pools either (a) fail completely (but perhaps temporarily,
284 * e.g. a top-level vdev going offline), or (b) have localized,
285 * permanent errors (e.g. disk returns the wrong data due to bit flip or
286 * firmware bug). In case (a), this setting does not matter because the
287 * pool will be suspended and the sync thread will not be able to make
288 * forward progress regardless. In case (b), because the error is
289 * permanent, the best we can do is leak the minimum amount of space,
290 * which is what setting this flag will do. Therefore, it is reasonable
291 * for this flag to normally be set, but we chose the more conservative
292 * approach of not setting it, so that there is no possibility of
293 * leaking space in the "partial temporary" failure case.
295 int zfs_free_leak_on_eio = B_FALSE;
298 * Expiration time in milliseconds. This value has two meanings. First it is
299 * used to determine when the spa_deadman() logic should fire. By default the
300 * spa_deadman() will fire if spa_sync() has not completed in 600 seconds.
301 * Secondly, the value determines if an I/O is considered "hung". Any I/O that
302 * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting
303 * in one of three behaviors controlled by zfs_deadman_failmode.
305 unsigned long zfs_deadman_synctime_ms = 600000ULL;
308 * This value controls the maximum amount of time zio_wait() will block for an
309 * outstanding IO. By default this is 300 seconds at which point the "hung"
310 * behavior will be applied as described for zfs_deadman_synctime_ms.
312 unsigned long zfs_deadman_ziotime_ms = 300000ULL;
315 * Check time in milliseconds. This defines the frequency at which we check
318 unsigned long zfs_deadman_checktime_ms = 60000ULL;
321 * By default the deadman is enabled.
323 int zfs_deadman_enabled = 1;
326 * Controls the behavior of the deadman when it detects a "hung" I/O.
327 * Valid values are zfs_deadman_failmode=<wait|continue|panic>.
329 * wait - Wait for the "hung" I/O (default)
330 * continue - Attempt to recover from a "hung" I/O
331 * panic - Panic the system
333 char *zfs_deadman_failmode = "wait";
336 * The worst case is single-sector max-parity RAID-Z blocks, in which
337 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
338 * times the size; so just assume that. Add to this the fact that
339 * we can have up to 3 DVAs per bp, and one more factor of 2 because
340 * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together,
342 * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
344 int spa_asize_inflation = 24;
347 * Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in
348 * the pool to be consumed. This ensures that we don't run the pool
349 * completely out of space, due to unaccounted changes (e.g. to the MOS).
350 * It also limits the worst-case time to allocate space. If we have
351 * less than this amount of free space, most ZPL operations (e.g. write,
352 * create) will return ENOSPC.
354 * Certain operations (e.g. file removal, most administrative actions) can
355 * use half the slop space. They will only return ENOSPC if less than half
356 * the slop space is free. Typically, once the pool has less than the slop
357 * space free, the user will use these operations to free up space in the pool.
358 * These are the operations that call dsl_pool_adjustedsize() with the netfree
359 * argument set to TRUE.
361 * Operations that are almost guaranteed to free up space in the absence of
362 * a pool checkpoint can use up to three quarters of the slop space
365 * A very restricted set of operations are always permitted, regardless of
366 * the amount of free space. These are the operations that call
367 * dsl_sync_task(ZFS_SPACE_CHECK_NONE). If these operations result in a net
368 * increase in the amount of space used, it is possible to run the pool
369 * completely out of space, causing it to be permanently read-only.
371 * Note that on very small pools, the slop space will be larger than
372 * 3.2%, in an effort to have it be at least spa_min_slop (128MB),
373 * but we never allow it to be more than half the pool size.
375 * See also the comments in zfs_space_check_t.
377 int spa_slop_shift = 5;
378 uint64_t spa_min_slop = 128 * 1024 * 1024;
379 int spa_allocators = 4;
384 spa_load_failed(spa_t *spa, const char *fmt, ...)
390 (void) vsnprintf(buf, sizeof (buf), fmt, adx);
393 zfs_dbgmsg("spa_load(%s, config %s): FAILED: %s", spa->spa_name,
394 spa->spa_trust_config ? "trusted" : "untrusted", buf);
399 spa_load_note(spa_t *spa, const char *fmt, ...)
405 (void) vsnprintf(buf, sizeof (buf), fmt, adx);
408 zfs_dbgmsg("spa_load(%s, config %s): %s", spa->spa_name,
409 spa->spa_trust_config ? "trusted" : "untrusted", buf);
413 * By default dedup and user data indirects land in the special class
415 int zfs_ddt_data_is_special = B_TRUE;
416 int zfs_user_indirect_is_special = B_TRUE;
419 * The percentage of special class final space reserved for metadata only.
420 * Once we allocate 100 - zfs_special_class_metadata_reserve_pct we only
421 * let metadata into the class.
423 int zfs_special_class_metadata_reserve_pct = 25;
426 * ==========================================================================
428 * ==========================================================================
431 spa_config_lock_init(spa_t *spa)
433 for (int i = 0; i < SCL_LOCKS; i++) {
434 spa_config_lock_t *scl = &spa->spa_config_lock[i];
435 mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL);
436 cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL);
437 refcount_create_untracked(&scl->scl_count);
438 scl->scl_writer = NULL;
439 scl->scl_write_wanted = 0;
444 spa_config_lock_destroy(spa_t *spa)
446 for (int i = 0; i < SCL_LOCKS; i++) {
447 spa_config_lock_t *scl = &spa->spa_config_lock[i];
448 mutex_destroy(&scl->scl_lock);
449 cv_destroy(&scl->scl_cv);
450 refcount_destroy(&scl->scl_count);
451 ASSERT(scl->scl_writer == NULL);
452 ASSERT(scl->scl_write_wanted == 0);
457 spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw)
459 for (int i = 0; i < SCL_LOCKS; i++) {
460 spa_config_lock_t *scl = &spa->spa_config_lock[i];
461 if (!(locks & (1 << i)))
463 mutex_enter(&scl->scl_lock);
464 if (rw == RW_READER) {
465 if (scl->scl_writer || scl->scl_write_wanted) {
466 mutex_exit(&scl->scl_lock);
467 spa_config_exit(spa, locks & ((1 << i) - 1),
472 ASSERT(scl->scl_writer != curthread);
473 if (!refcount_is_zero(&scl->scl_count)) {
474 mutex_exit(&scl->scl_lock);
475 spa_config_exit(spa, locks & ((1 << i) - 1),
479 scl->scl_writer = curthread;
481 (void) refcount_add(&scl->scl_count, tag);
482 mutex_exit(&scl->scl_lock);
488 spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw)
492 ASSERT3U(SCL_LOCKS, <, sizeof (wlocks_held) * NBBY);
494 for (int i = 0; i < SCL_LOCKS; i++) {
495 spa_config_lock_t *scl = &spa->spa_config_lock[i];
496 if (scl->scl_writer == curthread)
497 wlocks_held |= (1 << i);
498 if (!(locks & (1 << i)))
500 mutex_enter(&scl->scl_lock);
501 if (rw == RW_READER) {
502 while (scl->scl_writer || scl->scl_write_wanted) {
503 cv_wait(&scl->scl_cv, &scl->scl_lock);
506 ASSERT(scl->scl_writer != curthread);
507 while (!refcount_is_zero(&scl->scl_count)) {
508 scl->scl_write_wanted++;
509 cv_wait(&scl->scl_cv, &scl->scl_lock);
510 scl->scl_write_wanted--;
512 scl->scl_writer = curthread;
514 (void) refcount_add(&scl->scl_count, tag);
515 mutex_exit(&scl->scl_lock);
517 ASSERT3U(wlocks_held, <=, locks);
521 spa_config_exit(spa_t *spa, int locks, void *tag)
523 for (int i = SCL_LOCKS - 1; i >= 0; i--) {
524 spa_config_lock_t *scl = &spa->spa_config_lock[i];
525 if (!(locks & (1 << i)))
527 mutex_enter(&scl->scl_lock);
528 ASSERT(!refcount_is_zero(&scl->scl_count));
529 if (refcount_remove(&scl->scl_count, tag) == 0) {
530 ASSERT(scl->scl_writer == NULL ||
531 scl->scl_writer == curthread);
532 scl->scl_writer = NULL; /* OK in either case */
533 cv_broadcast(&scl->scl_cv);
535 mutex_exit(&scl->scl_lock);
540 spa_config_held(spa_t *spa, int locks, krw_t rw)
544 for (int i = 0; i < SCL_LOCKS; i++) {
545 spa_config_lock_t *scl = &spa->spa_config_lock[i];
546 if (!(locks & (1 << i)))
548 if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) ||
549 (rw == RW_WRITER && scl->scl_writer == curthread))
550 locks_held |= 1 << i;
557 * ==========================================================================
558 * SPA namespace functions
559 * ==========================================================================
563 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
564 * Returns NULL if no matching spa_t is found.
567 spa_lookup(const char *name)
569 static spa_t search; /* spa_t is large; don't allocate on stack */
574 ASSERT(MUTEX_HELD(&spa_namespace_lock));
576 (void) strlcpy(search.spa_name, name, sizeof (search.spa_name));
579 * If it's a full dataset name, figure out the pool name and
582 cp = strpbrk(search.spa_name, "/@#");
586 spa = avl_find(&spa_namespace_avl, &search, &where);
592 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
593 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues
594 * looking for potentially hung I/Os.
597 spa_deadman(void *arg)
601 /* Disable the deadman if the pool is suspended. */
602 if (spa_suspended(spa))
605 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
606 (gethrtime() - spa->spa_sync_starttime) / NANOSEC,
607 ++spa->spa_deadman_calls);
608 if (zfs_deadman_enabled)
609 vdev_deadman(spa->spa_root_vdev, FTAG);
611 spa->spa_deadman_tqid = taskq_dispatch_delay(system_delay_taskq,
612 spa_deadman, spa, TQ_SLEEP, ddi_get_lbolt() +
613 MSEC_TO_TICK(zfs_deadman_checktime_ms));
617 * Create an uninitialized spa_t with the given name. Requires
618 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
619 * exist by calling spa_lookup() first.
622 spa_add(const char *name, nvlist_t *config, const char *altroot)
625 spa_config_dirent_t *dp;
627 ASSERT(MUTEX_HELD(&spa_namespace_lock));
629 spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP);
631 mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
632 mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
633 mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL);
634 mutex_init(&spa->spa_evicting_os_lock, NULL, MUTEX_DEFAULT, NULL);
635 mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL);
636 mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL);
637 mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL);
638 mutex_init(&spa->spa_cksum_tmpls_lock, NULL, MUTEX_DEFAULT, NULL);
639 mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL);
640 mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL);
641 mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL);
642 mutex_init(&spa->spa_feat_stats_lock, NULL, MUTEX_DEFAULT, NULL);
644 cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL);
645 cv_init(&spa->spa_evicting_os_cv, NULL, CV_DEFAULT, NULL);
646 cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL);
647 cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL);
648 cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL);
650 for (int t = 0; t < TXG_SIZE; t++)
651 bplist_create(&spa->spa_free_bplist[t]);
653 (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name));
654 spa->spa_state = POOL_STATE_UNINITIALIZED;
655 spa->spa_freeze_txg = UINT64_MAX;
656 spa->spa_final_txg = UINT64_MAX;
657 spa->spa_load_max_txg = UINT64_MAX;
659 spa->spa_proc_state = SPA_PROC_NONE;
660 spa->spa_trust_config = B_TRUE;
662 spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime_ms);
663 spa->spa_deadman_ziotime = MSEC2NSEC(zfs_deadman_ziotime_ms);
664 spa_set_deadman_failmode(spa, zfs_deadman_failmode);
666 refcount_create(&spa->spa_refcount);
667 spa_config_lock_init(spa);
670 avl_add(&spa_namespace_avl, spa);
673 * Set the alternate root, if there is one.
676 spa->spa_root = spa_strdup(altroot);
678 spa->spa_alloc_count = spa_allocators;
679 spa->spa_alloc_locks = kmem_zalloc(spa->spa_alloc_count *
680 sizeof (kmutex_t), KM_SLEEP);
681 spa->spa_alloc_trees = kmem_zalloc(spa->spa_alloc_count *
682 sizeof (avl_tree_t), KM_SLEEP);
683 for (int i = 0; i < spa->spa_alloc_count; i++) {
684 mutex_init(&spa->spa_alloc_locks[i], NULL, MUTEX_DEFAULT, NULL);
685 avl_create(&spa->spa_alloc_trees[i], zio_bookmark_compare,
686 sizeof (zio_t), offsetof(zio_t, io_alloc_node));
690 * Every pool starts with the default cachefile
692 list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t),
693 offsetof(spa_config_dirent_t, scd_link));
695 dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP);
696 dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path);
697 list_insert_head(&spa->spa_config_list, dp);
699 VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME,
702 if (config != NULL) {
705 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ,
707 VERIFY(nvlist_dup(features, &spa->spa_label_features,
711 VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0);
714 if (spa->spa_label_features == NULL) {
715 VERIFY(nvlist_alloc(&spa->spa_label_features, NV_UNIQUE_NAME,
719 spa->spa_min_ashift = INT_MAX;
720 spa->spa_max_ashift = 0;
722 /* Reset cached value */
723 spa->spa_dedup_dspace = ~0ULL;
726 * As a pool is being created, treat all features as disabled by
727 * setting SPA_FEATURE_DISABLED for all entries in the feature
730 for (int i = 0; i < SPA_FEATURES; i++) {
731 spa->spa_feat_refcount_cache[i] = SPA_FEATURE_DISABLED;
738 * Removes a spa_t from the namespace, freeing up any memory used. Requires
739 * spa_namespace_lock. This is called only after the spa_t has been closed and
743 spa_remove(spa_t *spa)
745 spa_config_dirent_t *dp;
747 ASSERT(MUTEX_HELD(&spa_namespace_lock));
748 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
749 ASSERT3U(refcount_count(&spa->spa_refcount), ==, 0);
751 nvlist_free(spa->spa_config_splitting);
753 avl_remove(&spa_namespace_avl, spa);
754 cv_broadcast(&spa_namespace_cv);
757 spa_strfree(spa->spa_root);
759 while ((dp = list_head(&spa->spa_config_list)) != NULL) {
760 list_remove(&spa->spa_config_list, dp);
761 if (dp->scd_path != NULL)
762 spa_strfree(dp->scd_path);
763 kmem_free(dp, sizeof (spa_config_dirent_t));
766 for (int i = 0; i < spa->spa_alloc_count; i++) {
767 avl_destroy(&spa->spa_alloc_trees[i]);
768 mutex_destroy(&spa->spa_alloc_locks[i]);
770 kmem_free(spa->spa_alloc_locks, spa->spa_alloc_count *
772 kmem_free(spa->spa_alloc_trees, spa->spa_alloc_count *
773 sizeof (avl_tree_t));
775 list_destroy(&spa->spa_config_list);
777 nvlist_free(spa->spa_label_features);
778 nvlist_free(spa->spa_load_info);
779 nvlist_free(spa->spa_feat_stats);
780 spa_config_set(spa, NULL);
782 refcount_destroy(&spa->spa_refcount);
784 spa_stats_destroy(spa);
785 spa_config_lock_destroy(spa);
787 for (int t = 0; t < TXG_SIZE; t++)
788 bplist_destroy(&spa->spa_free_bplist[t]);
790 zio_checksum_templates_free(spa);
792 cv_destroy(&spa->spa_async_cv);
793 cv_destroy(&spa->spa_evicting_os_cv);
794 cv_destroy(&spa->spa_proc_cv);
795 cv_destroy(&spa->spa_scrub_io_cv);
796 cv_destroy(&spa->spa_suspend_cv);
798 mutex_destroy(&spa->spa_async_lock);
799 mutex_destroy(&spa->spa_errlist_lock);
800 mutex_destroy(&spa->spa_errlog_lock);
801 mutex_destroy(&spa->spa_evicting_os_lock);
802 mutex_destroy(&spa->spa_history_lock);
803 mutex_destroy(&spa->spa_proc_lock);
804 mutex_destroy(&spa->spa_props_lock);
805 mutex_destroy(&spa->spa_cksum_tmpls_lock);
806 mutex_destroy(&spa->spa_scrub_lock);
807 mutex_destroy(&spa->spa_suspend_lock);
808 mutex_destroy(&spa->spa_vdev_top_lock);
809 mutex_destroy(&spa->spa_feat_stats_lock);
811 kmem_free(spa, sizeof (spa_t));
815 * Given a pool, return the next pool in the namespace, or NULL if there is
816 * none. If 'prev' is NULL, return the first pool.
819 spa_next(spa_t *prev)
821 ASSERT(MUTEX_HELD(&spa_namespace_lock));
824 return (AVL_NEXT(&spa_namespace_avl, prev));
826 return (avl_first(&spa_namespace_avl));
830 * ==========================================================================
831 * SPA refcount functions
832 * ==========================================================================
836 * Add a reference to the given spa_t. Must have at least one reference, or
837 * have the namespace lock held.
840 spa_open_ref(spa_t *spa, void *tag)
842 ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref ||
843 MUTEX_HELD(&spa_namespace_lock));
844 (void) refcount_add(&spa->spa_refcount, tag);
848 * Remove a reference to the given spa_t. Must have at least one reference, or
849 * have the namespace lock held.
852 spa_close(spa_t *spa, void *tag)
854 ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref ||
855 MUTEX_HELD(&spa_namespace_lock));
856 (void) refcount_remove(&spa->spa_refcount, tag);
860 * Remove a reference to the given spa_t held by a dsl dir that is
861 * being asynchronously released. Async releases occur from a taskq
862 * performing eviction of dsl datasets and dirs. The namespace lock
863 * isn't held and the hold by the object being evicted may contribute to
864 * spa_minref (e.g. dataset or directory released during pool export),
865 * so the asserts in spa_close() do not apply.
868 spa_async_close(spa_t *spa, void *tag)
870 (void) refcount_remove(&spa->spa_refcount, tag);
874 * Check to see if the spa refcount is zero. Must be called with
875 * spa_namespace_lock held. We really compare against spa_minref, which is the
876 * number of references acquired when opening a pool
879 spa_refcount_zero(spa_t *spa)
881 ASSERT(MUTEX_HELD(&spa_namespace_lock));
883 return (refcount_count(&spa->spa_refcount) == spa->spa_minref);
887 * ==========================================================================
888 * SPA spare and l2cache tracking
889 * ==========================================================================
893 * Hot spares and cache devices are tracked using the same code below,
894 * for 'auxiliary' devices.
897 typedef struct spa_aux {
905 spa_aux_compare(const void *a, const void *b)
907 const spa_aux_t *sa = (const spa_aux_t *)a;
908 const spa_aux_t *sb = (const spa_aux_t *)b;
910 return (AVL_CMP(sa->aux_guid, sb->aux_guid));
914 spa_aux_add(vdev_t *vd, avl_tree_t *avl)
920 search.aux_guid = vd->vdev_guid;
921 if ((aux = avl_find(avl, &search, &where)) != NULL) {
924 aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP);
925 aux->aux_guid = vd->vdev_guid;
927 avl_insert(avl, aux, where);
932 spa_aux_remove(vdev_t *vd, avl_tree_t *avl)
938 search.aux_guid = vd->vdev_guid;
939 aux = avl_find(avl, &search, &where);
943 if (--aux->aux_count == 0) {
944 avl_remove(avl, aux);
945 kmem_free(aux, sizeof (spa_aux_t));
946 } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) {
947 aux->aux_pool = 0ULL;
952 spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl)
954 spa_aux_t search, *found;
956 search.aux_guid = guid;
957 found = avl_find(avl, &search, NULL);
961 *pool = found->aux_pool;
968 *refcnt = found->aux_count;
973 return (found != NULL);
977 spa_aux_activate(vdev_t *vd, avl_tree_t *avl)
979 spa_aux_t search, *found;
982 search.aux_guid = vd->vdev_guid;
983 found = avl_find(avl, &search, &where);
984 ASSERT(found != NULL);
985 ASSERT(found->aux_pool == 0ULL);
987 found->aux_pool = spa_guid(vd->vdev_spa);
991 * Spares are tracked globally due to the following constraints:
993 * - A spare may be part of multiple pools.
994 * - A spare may be added to a pool even if it's actively in use within
996 * - A spare in use in any pool can only be the source of a replacement if
997 * the target is a spare in the same pool.
999 * We keep track of all spares on the system through the use of a reference
1000 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
1001 * spare, then we bump the reference count in the AVL tree. In addition, we set
1002 * the 'vdev_isspare' member to indicate that the device is a spare (active or
1003 * inactive). When a spare is made active (used to replace a device in the
1004 * pool), we also keep track of which pool its been made a part of.
1006 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
1007 * called under the spa_namespace lock as part of vdev reconfiguration. The
1008 * separate spare lock exists for the status query path, which does not need to
1009 * be completely consistent with respect to other vdev configuration changes.
1013 spa_spare_compare(const void *a, const void *b)
1015 return (spa_aux_compare(a, b));
1019 spa_spare_add(vdev_t *vd)
1021 mutex_enter(&spa_spare_lock);
1022 ASSERT(!vd->vdev_isspare);
1023 spa_aux_add(vd, &spa_spare_avl);
1024 vd->vdev_isspare = B_TRUE;
1025 mutex_exit(&spa_spare_lock);
1029 spa_spare_remove(vdev_t *vd)
1031 mutex_enter(&spa_spare_lock);
1032 ASSERT(vd->vdev_isspare);
1033 spa_aux_remove(vd, &spa_spare_avl);
1034 vd->vdev_isspare = B_FALSE;
1035 mutex_exit(&spa_spare_lock);
1039 spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt)
1043 mutex_enter(&spa_spare_lock);
1044 found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl);
1045 mutex_exit(&spa_spare_lock);
1051 spa_spare_activate(vdev_t *vd)
1053 mutex_enter(&spa_spare_lock);
1054 ASSERT(vd->vdev_isspare);
1055 spa_aux_activate(vd, &spa_spare_avl);
1056 mutex_exit(&spa_spare_lock);
1060 * Level 2 ARC devices are tracked globally for the same reasons as spares.
1061 * Cache devices currently only support one pool per cache device, and so
1062 * for these devices the aux reference count is currently unused beyond 1.
1066 spa_l2cache_compare(const void *a, const void *b)
1068 return (spa_aux_compare(a, b));
1072 spa_l2cache_add(vdev_t *vd)
1074 mutex_enter(&spa_l2cache_lock);
1075 ASSERT(!vd->vdev_isl2cache);
1076 spa_aux_add(vd, &spa_l2cache_avl);
1077 vd->vdev_isl2cache = B_TRUE;
1078 mutex_exit(&spa_l2cache_lock);
1082 spa_l2cache_remove(vdev_t *vd)
1084 mutex_enter(&spa_l2cache_lock);
1085 ASSERT(vd->vdev_isl2cache);
1086 spa_aux_remove(vd, &spa_l2cache_avl);
1087 vd->vdev_isl2cache = B_FALSE;
1088 mutex_exit(&spa_l2cache_lock);
1092 spa_l2cache_exists(uint64_t guid, uint64_t *pool)
1096 mutex_enter(&spa_l2cache_lock);
1097 found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl);
1098 mutex_exit(&spa_l2cache_lock);
1104 spa_l2cache_activate(vdev_t *vd)
1106 mutex_enter(&spa_l2cache_lock);
1107 ASSERT(vd->vdev_isl2cache);
1108 spa_aux_activate(vd, &spa_l2cache_avl);
1109 mutex_exit(&spa_l2cache_lock);
1113 * ==========================================================================
1115 * ==========================================================================
1119 * Lock the given spa_t for the purpose of adding or removing a vdev.
1120 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
1121 * It returns the next transaction group for the spa_t.
1124 spa_vdev_enter(spa_t *spa)
1126 mutex_enter(&spa->spa_vdev_top_lock);
1127 mutex_enter(&spa_namespace_lock);
1128 return (spa_vdev_config_enter(spa));
1132 * Internal implementation for spa_vdev_enter(). Used when a vdev
1133 * operation requires multiple syncs (i.e. removing a device) while
1134 * keeping the spa_namespace_lock held.
1137 spa_vdev_config_enter(spa_t *spa)
1139 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1141 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
1143 return (spa_last_synced_txg(spa) + 1);
1147 * Used in combination with spa_vdev_config_enter() to allow the syncing
1148 * of multiple transactions without releasing the spa_namespace_lock.
1151 spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag)
1153 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1155 int config_changed = B_FALSE;
1157 ASSERT(txg > spa_last_synced_txg(spa));
1159 spa->spa_pending_vdev = NULL;
1162 * Reassess the DTLs.
1164 vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE);
1166 if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) {
1167 config_changed = B_TRUE;
1168 spa->spa_config_generation++;
1172 * Verify the metaslab classes.
1174 ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0);
1175 ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0);
1176 ASSERT(metaslab_class_validate(spa_special_class(spa)) == 0);
1177 ASSERT(metaslab_class_validate(spa_dedup_class(spa)) == 0);
1179 spa_config_exit(spa, SCL_ALL, spa);
1182 * Panic the system if the specified tag requires it. This
1183 * is useful for ensuring that configurations are updated
1186 if (zio_injection_enabled)
1187 zio_handle_panic_injection(spa, tag, 0);
1190 * Note: this txg_wait_synced() is important because it ensures
1191 * that there won't be more than one config change per txg.
1192 * This allows us to use the txg as the generation number.
1195 txg_wait_synced(spa->spa_dsl_pool, txg);
1198 ASSERT(!vd->vdev_detached || vd->vdev_dtl_sm == NULL);
1199 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
1201 spa_config_exit(spa, SCL_ALL, spa);
1205 * If the config changed, update the config cache.
1208 spa_write_cachefile(spa, B_FALSE, B_TRUE);
1212 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
1213 * locking of spa_vdev_enter(), we also want make sure the transactions have
1214 * synced to disk, and then update the global configuration cache with the new
1218 spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error)
1220 spa_vdev_config_exit(spa, vd, txg, error, FTAG);
1221 mutex_exit(&spa_namespace_lock);
1222 mutex_exit(&spa->spa_vdev_top_lock);
1228 * Lock the given spa_t for the purpose of changing vdev state.
1231 spa_vdev_state_enter(spa_t *spa, int oplocks)
1233 int locks = SCL_STATE_ALL | oplocks;
1236 * Root pools may need to read of the underlying devfs filesystem
1237 * when opening up a vdev. Unfortunately if we're holding the
1238 * SCL_ZIO lock it will result in a deadlock when we try to issue
1239 * the read from the root filesystem. Instead we "prefetch"
1240 * the associated vnodes that we need prior to opening the
1241 * underlying devices and cache them so that we can prevent
1242 * any I/O when we are doing the actual open.
1244 if (spa_is_root(spa)) {
1245 int low = locks & ~(SCL_ZIO - 1);
1246 int high = locks & ~low;
1248 spa_config_enter(spa, high, spa, RW_WRITER);
1249 vdev_hold(spa->spa_root_vdev);
1250 spa_config_enter(spa, low, spa, RW_WRITER);
1252 spa_config_enter(spa, locks, spa, RW_WRITER);
1254 spa->spa_vdev_locks = locks;
1258 spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error)
1260 boolean_t config_changed = B_FALSE;
1263 if (vd == NULL || vd == spa->spa_root_vdev) {
1264 vdev_top = spa->spa_root_vdev;
1266 vdev_top = vd->vdev_top;
1269 if (vd != NULL || error == 0)
1270 vdev_dtl_reassess(vdev_top, 0, 0, B_FALSE);
1273 if (vd != spa->spa_root_vdev)
1274 vdev_state_dirty(vdev_top);
1276 config_changed = B_TRUE;
1277 spa->spa_config_generation++;
1280 if (spa_is_root(spa))
1281 vdev_rele(spa->spa_root_vdev);
1283 ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL);
1284 spa_config_exit(spa, spa->spa_vdev_locks, spa);
1287 * If anything changed, wait for it to sync. This ensures that,
1288 * from the system administrator's perspective, zpool(1M) commands
1289 * are synchronous. This is important for things like zpool offline:
1290 * when the command completes, you expect no further I/O from ZFS.
1293 txg_wait_synced(spa->spa_dsl_pool, 0);
1296 * If the config changed, update the config cache.
1298 if (config_changed) {
1299 mutex_enter(&spa_namespace_lock);
1300 spa_write_cachefile(spa, B_FALSE, B_TRUE);
1301 mutex_exit(&spa_namespace_lock);
1308 * ==========================================================================
1309 * Miscellaneous functions
1310 * ==========================================================================
1314 spa_activate_mos_feature(spa_t *spa, const char *feature, dmu_tx_t *tx)
1316 if (!nvlist_exists(spa->spa_label_features, feature)) {
1317 fnvlist_add_boolean(spa->spa_label_features, feature);
1319 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't
1320 * dirty the vdev config because lock SCL_CONFIG is not held.
1321 * Thankfully, in this case we don't need to dirty the config
1322 * because it will be written out anyway when we finish
1323 * creating the pool.
1325 if (tx->tx_txg != TXG_INITIAL)
1326 vdev_config_dirty(spa->spa_root_vdev);
1331 spa_deactivate_mos_feature(spa_t *spa, const char *feature)
1333 if (nvlist_remove_all(spa->spa_label_features, feature) == 0)
1334 vdev_config_dirty(spa->spa_root_vdev);
1341 spa_rename(const char *name, const char *newname)
1347 * Lookup the spa_t and grab the config lock for writing. We need to
1348 * actually open the pool so that we can sync out the necessary labels.
1349 * It's OK to call spa_open() with the namespace lock held because we
1350 * allow recursive calls for other reasons.
1352 mutex_enter(&spa_namespace_lock);
1353 if ((err = spa_open(name, &spa, FTAG)) != 0) {
1354 mutex_exit(&spa_namespace_lock);
1358 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1360 avl_remove(&spa_namespace_avl, spa);
1361 (void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name));
1362 avl_add(&spa_namespace_avl, spa);
1365 * Sync all labels to disk with the new names by marking the root vdev
1366 * dirty and waiting for it to sync. It will pick up the new pool name
1369 vdev_config_dirty(spa->spa_root_vdev);
1371 spa_config_exit(spa, SCL_ALL, FTAG);
1373 txg_wait_synced(spa->spa_dsl_pool, 0);
1376 * Sync the updated config cache.
1378 spa_write_cachefile(spa, B_FALSE, B_TRUE);
1380 spa_close(spa, FTAG);
1382 mutex_exit(&spa_namespace_lock);
1388 * Return the spa_t associated with given pool_guid, if it exists. If
1389 * device_guid is non-zero, determine whether the pool exists *and* contains
1390 * a device with the specified device_guid.
1393 spa_by_guid(uint64_t pool_guid, uint64_t device_guid)
1396 avl_tree_t *t = &spa_namespace_avl;
1398 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1400 for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) {
1401 if (spa->spa_state == POOL_STATE_UNINITIALIZED)
1403 if (spa->spa_root_vdev == NULL)
1405 if (spa_guid(spa) == pool_guid) {
1406 if (device_guid == 0)
1409 if (vdev_lookup_by_guid(spa->spa_root_vdev,
1410 device_guid) != NULL)
1414 * Check any devices we may be in the process of adding.
1416 if (spa->spa_pending_vdev) {
1417 if (vdev_lookup_by_guid(spa->spa_pending_vdev,
1418 device_guid) != NULL)
1428 * Determine whether a pool with the given pool_guid exists.
1431 spa_guid_exists(uint64_t pool_guid, uint64_t device_guid)
1433 return (spa_by_guid(pool_guid, device_guid) != NULL);
1437 spa_strdup(const char *s)
1443 new = kmem_alloc(len + 1, KM_SLEEP);
1451 spa_strfree(char *s)
1453 kmem_free(s, strlen(s) + 1);
1457 spa_get_random(uint64_t range)
1466 (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t));
1472 spa_generate_guid(spa_t *spa)
1474 uint64_t guid = spa_get_random(-1ULL);
1477 while (guid == 0 || spa_guid_exists(spa_guid(spa), guid))
1478 guid = spa_get_random(-1ULL);
1480 while (guid == 0 || spa_guid_exists(guid, 0))
1481 guid = spa_get_random(-1ULL);
1488 snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp)
1491 char *checksum = NULL;
1492 char *compress = NULL;
1495 if (BP_GET_TYPE(bp) & DMU_OT_NEWTYPE) {
1496 dmu_object_byteswap_t bswap =
1497 DMU_OT_BYTESWAP(BP_GET_TYPE(bp));
1498 (void) snprintf(type, sizeof (type), "bswap %s %s",
1499 DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) ?
1500 "metadata" : "data",
1501 dmu_ot_byteswap[bswap].ob_name);
1503 (void) strlcpy(type, dmu_ot[BP_GET_TYPE(bp)].ot_name,
1506 if (!BP_IS_EMBEDDED(bp)) {
1508 zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name;
1510 compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name;
1513 SNPRINTF_BLKPTR(snprintf, ' ', buf, buflen, bp, type, checksum,
1518 spa_freeze(spa_t *spa)
1520 uint64_t freeze_txg = 0;
1522 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1523 if (spa->spa_freeze_txg == UINT64_MAX) {
1524 freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE;
1525 spa->spa_freeze_txg = freeze_txg;
1527 spa_config_exit(spa, SCL_ALL, FTAG);
1528 if (freeze_txg != 0)
1529 txg_wait_synced(spa_get_dsl(spa), freeze_txg);
1533 zfs_panic_recover(const char *fmt, ...)
1538 vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
1543 * This is a stripped-down version of strtoull, suitable only for converting
1544 * lowercase hexadecimal numbers that don't overflow.
1547 zfs_strtonum(const char *str, char **nptr)
1553 while ((c = *str) != '\0') {
1554 if (c >= '0' && c <= '9')
1556 else if (c >= 'a' && c <= 'f')
1557 digit = 10 + c - 'a';
1568 *nptr = (char *)str;
1574 spa_activate_allocation_classes(spa_t *spa, dmu_tx_t *tx)
1577 * We bump the feature refcount for each special vdev added to the pool
1579 ASSERT(spa_feature_is_enabled(spa, SPA_FEATURE_ALLOCATION_CLASSES));
1580 spa_feature_incr(spa, SPA_FEATURE_ALLOCATION_CLASSES, tx);
1584 * ==========================================================================
1585 * Accessor functions
1586 * ==========================================================================
1590 spa_shutting_down(spa_t *spa)
1592 return (spa->spa_async_suspended);
1596 spa_get_dsl(spa_t *spa)
1598 return (spa->spa_dsl_pool);
1602 spa_is_initializing(spa_t *spa)
1604 return (spa->spa_is_initializing);
1608 spa_indirect_vdevs_loaded(spa_t *spa)
1610 return (spa->spa_indirect_vdevs_loaded);
1614 spa_get_rootblkptr(spa_t *spa)
1616 return (&spa->spa_ubsync.ub_rootbp);
1620 spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp)
1622 spa->spa_uberblock.ub_rootbp = *bp;
1626 spa_altroot(spa_t *spa, char *buf, size_t buflen)
1628 if (spa->spa_root == NULL)
1631 (void) strncpy(buf, spa->spa_root, buflen);
1635 spa_sync_pass(spa_t *spa)
1637 return (spa->spa_sync_pass);
1641 spa_name(spa_t *spa)
1643 return (spa->spa_name);
1647 spa_guid(spa_t *spa)
1649 dsl_pool_t *dp = spa_get_dsl(spa);
1653 * If we fail to parse the config during spa_load(), we can go through
1654 * the error path (which posts an ereport) and end up here with no root
1655 * vdev. We stash the original pool guid in 'spa_config_guid' to handle
1658 if (spa->spa_root_vdev == NULL)
1659 return (spa->spa_config_guid);
1661 guid = spa->spa_last_synced_guid != 0 ?
1662 spa->spa_last_synced_guid : spa->spa_root_vdev->vdev_guid;
1665 * Return the most recently synced out guid unless we're
1666 * in syncing context.
1668 if (dp && dsl_pool_sync_context(dp))
1669 return (spa->spa_root_vdev->vdev_guid);
1675 spa_load_guid(spa_t *spa)
1678 * This is a GUID that exists solely as a reference for the
1679 * purposes of the arc. It is generated at load time, and
1680 * is never written to persistent storage.
1682 return (spa->spa_load_guid);
1686 spa_last_synced_txg(spa_t *spa)
1688 return (spa->spa_ubsync.ub_txg);
1692 spa_first_txg(spa_t *spa)
1694 return (spa->spa_first_txg);
1698 spa_syncing_txg(spa_t *spa)
1700 return (spa->spa_syncing_txg);
1704 * Return the last txg where data can be dirtied. The final txgs
1705 * will be used to just clear out any deferred frees that remain.
1708 spa_final_dirty_txg(spa_t *spa)
1710 return (spa->spa_final_txg - TXG_DEFER_SIZE);
1714 spa_state(spa_t *spa)
1716 return (spa->spa_state);
1720 spa_load_state(spa_t *spa)
1722 return (spa->spa_load_state);
1726 spa_freeze_txg(spa_t *spa)
1728 return (spa->spa_freeze_txg);
1732 * Return the inflated asize for a logical write in bytes. This is used by the
1733 * DMU to calculate the space a logical write will require on disk.
1734 * If lsize is smaller than the largest physical block size allocatable on this
1735 * pool we use its value instead, since the write will end up using the whole
1739 spa_get_worst_case_asize(spa_t *spa, uint64_t lsize)
1742 return (0); /* No inflation needed */
1743 return (MAX(lsize, 1 << spa->spa_max_ashift) * spa_asize_inflation);
1747 * Return the amount of slop space in bytes. It is 1/32 of the pool (3.2%),
1748 * or at least 128MB, unless that would cause it to be more than half the
1751 * See the comment above spa_slop_shift for details.
1754 spa_get_slop_space(spa_t *spa)
1756 uint64_t space = spa_get_dspace(spa);
1757 return (MAX(space >> spa_slop_shift, MIN(space >> 1, spa_min_slop)));
1761 spa_get_dspace(spa_t *spa)
1763 return (spa->spa_dspace);
1767 spa_get_checkpoint_space(spa_t *spa)
1769 return (spa->spa_checkpoint_info.sci_dspace);
1773 spa_update_dspace(spa_t *spa)
1775 spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) +
1776 ddt_get_dedup_dspace(spa);
1777 if (spa->spa_vdev_removal != NULL) {
1779 * We can't allocate from the removing device, so
1780 * subtract its size. This prevents the DMU/DSL from
1781 * filling up the (now smaller) pool while we are in the
1782 * middle of removing the device.
1784 * Note that the DMU/DSL doesn't actually know or care
1785 * how much space is allocated (it does its own tracking
1786 * of how much space has been logically used). So it
1787 * doesn't matter that the data we are moving may be
1788 * allocated twice (on the old device and the new
1791 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
1793 vdev_lookup_top(spa, spa->spa_vdev_removal->svr_vdev_id);
1794 spa->spa_dspace -= spa_deflate(spa) ?
1795 vd->vdev_stat.vs_dspace : vd->vdev_stat.vs_space;
1796 spa_config_exit(spa, SCL_VDEV, FTAG);
1801 * Return the failure mode that has been set to this pool. The default
1802 * behavior will be to block all I/Os when a complete failure occurs.
1805 spa_get_failmode(spa_t *spa)
1807 return (spa->spa_failmode);
1811 spa_suspended(spa_t *spa)
1813 return (spa->spa_suspended != ZIO_SUSPEND_NONE);
1817 spa_version(spa_t *spa)
1819 return (spa->spa_ubsync.ub_version);
1823 spa_deflate(spa_t *spa)
1825 return (spa->spa_deflate);
1829 spa_normal_class(spa_t *spa)
1831 return (spa->spa_normal_class);
1835 spa_log_class(spa_t *spa)
1837 return (spa->spa_log_class);
1841 spa_special_class(spa_t *spa)
1843 return (spa->spa_special_class);
1847 spa_dedup_class(spa_t *spa)
1849 return (spa->spa_dedup_class);
1853 * Locate an appropriate allocation class
1856 spa_preferred_class(spa_t *spa, uint64_t size, dmu_object_type_t objtype,
1857 uint_t level, uint_t special_smallblk)
1859 if (DMU_OT_IS_ZIL(objtype)) {
1860 if (spa->spa_log_class->mc_groups != 0)
1861 return (spa_log_class(spa));
1863 return (spa_normal_class(spa));
1866 boolean_t has_special_class = spa->spa_special_class->mc_groups != 0;
1868 if (DMU_OT_IS_DDT(objtype)) {
1869 if (spa->spa_dedup_class->mc_groups != 0)
1870 return (spa_dedup_class(spa));
1871 else if (has_special_class && zfs_ddt_data_is_special)
1872 return (spa_special_class(spa));
1874 return (spa_normal_class(spa));
1877 /* Indirect blocks for user data can land in special if allowed */
1878 if (level > 0 && (DMU_OT_IS_FILE(objtype) || objtype == DMU_OT_ZVOL)) {
1879 if (has_special_class && zfs_user_indirect_is_special)
1880 return (spa_special_class(spa));
1882 return (spa_normal_class(spa));
1885 if (DMU_OT_IS_METADATA(objtype) || level > 0) {
1886 if (has_special_class)
1887 return (spa_special_class(spa));
1889 return (spa_normal_class(spa));
1893 * Allow small file blocks in special class in some cases (like
1894 * for the dRAID vdev feature). But always leave a reserve of
1895 * zfs_special_class_metadata_reserve_pct exclusively for metadata.
1897 if (DMU_OT_IS_FILE(objtype) &&
1898 has_special_class && size < special_smallblk) {
1899 metaslab_class_t *special = spa_special_class(spa);
1900 uint64_t alloc = metaslab_class_get_alloc(special);
1901 uint64_t space = metaslab_class_get_space(special);
1903 (space * (100 - zfs_special_class_metadata_reserve_pct))
1910 return (spa_normal_class(spa));
1914 spa_evicting_os_register(spa_t *spa, objset_t *os)
1916 mutex_enter(&spa->spa_evicting_os_lock);
1917 list_insert_head(&spa->spa_evicting_os_list, os);
1918 mutex_exit(&spa->spa_evicting_os_lock);
1922 spa_evicting_os_deregister(spa_t *spa, objset_t *os)
1924 mutex_enter(&spa->spa_evicting_os_lock);
1925 list_remove(&spa->spa_evicting_os_list, os);
1926 cv_broadcast(&spa->spa_evicting_os_cv);
1927 mutex_exit(&spa->spa_evicting_os_lock);
1931 spa_evicting_os_wait(spa_t *spa)
1933 mutex_enter(&spa->spa_evicting_os_lock);
1934 while (!list_is_empty(&spa->spa_evicting_os_list))
1935 cv_wait(&spa->spa_evicting_os_cv, &spa->spa_evicting_os_lock);
1936 mutex_exit(&spa->spa_evicting_os_lock);
1938 dmu_buf_user_evict_wait();
1942 spa_max_replication(spa_t *spa)
1945 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
1946 * handle BPs with more than one DVA allocated. Set our max
1947 * replication level accordingly.
1949 if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS)
1951 return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override));
1955 spa_prev_software_version(spa_t *spa)
1957 return (spa->spa_prev_software_version);
1961 spa_deadman_synctime(spa_t *spa)
1963 return (spa->spa_deadman_synctime);
1967 spa_deadman_ziotime(spa_t *spa)
1969 return (spa->spa_deadman_ziotime);
1973 spa_get_deadman_failmode(spa_t *spa)
1975 return (spa->spa_deadman_failmode);
1979 spa_set_deadman_failmode(spa_t *spa, const char *failmode)
1981 if (strcmp(failmode, "wait") == 0)
1982 spa->spa_deadman_failmode = ZIO_FAILURE_MODE_WAIT;
1983 else if (strcmp(failmode, "continue") == 0)
1984 spa->spa_deadman_failmode = ZIO_FAILURE_MODE_CONTINUE;
1985 else if (strcmp(failmode, "panic") == 0)
1986 spa->spa_deadman_failmode = ZIO_FAILURE_MODE_PANIC;
1988 spa->spa_deadman_failmode = ZIO_FAILURE_MODE_WAIT;
1992 dva_get_dsize_sync(spa_t *spa, const dva_t *dva)
1994 uint64_t asize = DVA_GET_ASIZE(dva);
1995 uint64_t dsize = asize;
1997 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
1999 if (asize != 0 && spa->spa_deflate) {
2000 vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));
2002 dsize = (asize >> SPA_MINBLOCKSHIFT) *
2003 vd->vdev_deflate_ratio;
2010 bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp)
2014 for (int d = 0; d < BP_GET_NDVAS(bp); d++)
2015 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
2021 bp_get_dsize(spa_t *spa, const blkptr_t *bp)
2025 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
2027 for (int d = 0; d < BP_GET_NDVAS(bp); d++)
2028 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
2030 spa_config_exit(spa, SCL_VDEV, FTAG);
2036 spa_dirty_data(spa_t *spa)
2038 return (spa->spa_dsl_pool->dp_dirty_total);
2042 * ==========================================================================
2043 * Initialization and Termination
2044 * ==========================================================================
2048 spa_name_compare(const void *a1, const void *a2)
2050 const spa_t *s1 = a1;
2051 const spa_t *s2 = a2;
2054 s = strcmp(s1->spa_name, s2->spa_name);
2056 return (AVL_ISIGN(s));
2068 mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL);
2069 mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL);
2070 mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL);
2071 cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL);
2073 avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t),
2074 offsetof(spa_t, spa_avl));
2076 avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t),
2077 offsetof(spa_aux_t, aux_avl));
2079 avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t),
2080 offsetof(spa_aux_t, aux_avl));
2082 spa_mode_global = mode;
2085 if (spa_mode_global != FREAD && dprintf_find_string("watch")) {
2086 struct sigaction sa;
2088 sa.sa_flags = SA_SIGINFO;
2089 sigemptyset(&sa.sa_mask);
2090 sa.sa_sigaction = arc_buf_sigsegv;
2092 if (sigaction(SIGSEGV, &sa, NULL) == -1) {
2093 perror("could not enable watchpoints: "
2094 "sigaction(SIGSEGV, ...) = ");
2105 metaslab_alloc_trace_init();
2110 vdev_cache_stat_init();
2111 vdev_mirror_stat_init();
2112 vdev_raidz_math_init();
2116 zpool_feature_init();
2131 vdev_cache_stat_fini();
2132 vdev_mirror_stat_fini();
2133 vdev_raidz_math_fini();
2138 metaslab_alloc_trace_fini();
2146 avl_destroy(&spa_namespace_avl);
2147 avl_destroy(&spa_spare_avl);
2148 avl_destroy(&spa_l2cache_avl);
2150 cv_destroy(&spa_namespace_cv);
2151 mutex_destroy(&spa_namespace_lock);
2152 mutex_destroy(&spa_spare_lock);
2153 mutex_destroy(&spa_l2cache_lock);
2157 * Return whether this pool has slogs. No locking needed.
2158 * It's not a problem if the wrong answer is returned as it's only for
2159 * performance and not correctness
2162 spa_has_slogs(spa_t *spa)
2164 return (spa->spa_log_class->mc_rotor != NULL);
2168 spa_get_log_state(spa_t *spa)
2170 return (spa->spa_log_state);
2174 spa_set_log_state(spa_t *spa, spa_log_state_t state)
2176 spa->spa_log_state = state;
2180 spa_is_root(spa_t *spa)
2182 return (spa->spa_is_root);
2186 spa_writeable(spa_t *spa)
2188 return (!!(spa->spa_mode & FWRITE) && spa->spa_trust_config);
2192 * Returns true if there is a pending sync task in any of the current
2193 * syncing txg, the current quiescing txg, or the current open txg.
2196 spa_has_pending_synctask(spa_t *spa)
2198 return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks) ||
2199 !txg_all_lists_empty(&spa->spa_dsl_pool->dp_early_sync_tasks));
2203 spa_mode(spa_t *spa)
2205 return (spa->spa_mode);
2209 spa_bootfs(spa_t *spa)
2211 return (spa->spa_bootfs);
2215 spa_delegation(spa_t *spa)
2217 return (spa->spa_delegation);
2221 spa_meta_objset(spa_t *spa)
2223 return (spa->spa_meta_objset);
2227 spa_dedup_checksum(spa_t *spa)
2229 return (spa->spa_dedup_checksum);
2233 * Reset pool scan stat per scan pass (or reboot).
2236 spa_scan_stat_init(spa_t *spa)
2238 /* data not stored on disk */
2239 spa->spa_scan_pass_start = gethrestime_sec();
2240 if (dsl_scan_is_paused_scrub(spa->spa_dsl_pool->dp_scan))
2241 spa->spa_scan_pass_scrub_pause = spa->spa_scan_pass_start;
2243 spa->spa_scan_pass_scrub_pause = 0;
2244 spa->spa_scan_pass_scrub_spent_paused = 0;
2245 spa->spa_scan_pass_exam = 0;
2246 spa->spa_scan_pass_issued = 0;
2247 vdev_scan_stat_init(spa->spa_root_vdev);
2251 * Get scan stats for zpool status reports
2254 spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps)
2256 dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL;
2258 if (scn == NULL || scn->scn_phys.scn_func == POOL_SCAN_NONE)
2259 return (SET_ERROR(ENOENT));
2260 bzero(ps, sizeof (pool_scan_stat_t));
2262 /* data stored on disk */
2263 ps->pss_func = scn->scn_phys.scn_func;
2264 ps->pss_state = scn->scn_phys.scn_state;
2265 ps->pss_start_time = scn->scn_phys.scn_start_time;
2266 ps->pss_end_time = scn->scn_phys.scn_end_time;
2267 ps->pss_to_examine = scn->scn_phys.scn_to_examine;
2268 ps->pss_examined = scn->scn_phys.scn_examined;
2269 ps->pss_to_process = scn->scn_phys.scn_to_process;
2270 ps->pss_processed = scn->scn_phys.scn_processed;
2271 ps->pss_errors = scn->scn_phys.scn_errors;
2273 /* data not stored on disk */
2274 ps->pss_pass_exam = spa->spa_scan_pass_exam;
2275 ps->pss_pass_start = spa->spa_scan_pass_start;
2276 ps->pss_pass_scrub_pause = spa->spa_scan_pass_scrub_pause;
2277 ps->pss_pass_scrub_spent_paused = spa->spa_scan_pass_scrub_spent_paused;
2278 ps->pss_pass_issued = spa->spa_scan_pass_issued;
2280 scn->scn_issued_before_pass + spa->spa_scan_pass_issued;
2286 spa_maxblocksize(spa_t *spa)
2288 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS))
2289 return (SPA_MAXBLOCKSIZE);
2291 return (SPA_OLD_MAXBLOCKSIZE);
2296 * Returns the txg that the last device removal completed. No indirect mappings
2297 * have been added since this txg.
2300 spa_get_last_removal_txg(spa_t *spa)
2303 uint64_t ret = -1ULL;
2305 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
2307 * sr_prev_indirect_vdev is only modified while holding all the
2308 * config locks, so it is sufficient to hold SCL_VDEV as reader when
2311 vdevid = spa->spa_removing_phys.sr_prev_indirect_vdev;
2313 while (vdevid != -1ULL) {
2314 vdev_t *vd = vdev_lookup_top(spa, vdevid);
2315 vdev_indirect_births_t *vib = vd->vdev_indirect_births;
2317 ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
2320 * If the removal did not remap any data, we don't care.
2322 if (vdev_indirect_births_count(vib) != 0) {
2323 ret = vdev_indirect_births_last_entry_txg(vib);
2327 vdevid = vd->vdev_indirect_config.vic_prev_indirect_vdev;
2329 spa_config_exit(spa, SCL_VDEV, FTAG);
2332 spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL));
2338 spa_maxdnodesize(spa_t *spa)
2340 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_DNODE))
2341 return (DNODE_MAX_SIZE);
2343 return (DNODE_MIN_SIZE);
2347 spa_multihost(spa_t *spa)
2349 return (spa->spa_multihost ? B_TRUE : B_FALSE);
2353 spa_get_hostid(void)
2355 unsigned long myhostid;
2358 myhostid = zone_get_hostid(NULL);
2361 * We're emulating the system's hostid in userland, so
2362 * we can't use zone_get_hostid().
2364 (void) ddi_strtoul(hw_serial, NULL, 10, &myhostid);
2365 #endif /* _KERNEL */
2371 spa_trust_config(spa_t *spa)
2373 return (spa->spa_trust_config);
2377 spa_missing_tvds_allowed(spa_t *spa)
2379 return (spa->spa_missing_tvds_allowed);
2383 spa_set_missing_tvds(spa_t *spa, uint64_t missing)
2385 spa->spa_missing_tvds = missing;
2389 * Return the pool state string ("ONLINE", "DEGRADED", "SUSPENDED", etc).
2392 spa_state_to_name(spa_t *spa)
2394 vdev_state_t state = spa->spa_root_vdev->vdev_state;
2395 vdev_aux_t aux = spa->spa_root_vdev->vdev_stat.vs_aux;
2397 if (spa_suspended(spa) &&
2398 (spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE))
2399 return ("SUSPENDED");
2402 case VDEV_STATE_CLOSED:
2403 case VDEV_STATE_OFFLINE:
2405 case VDEV_STATE_REMOVED:
2407 case VDEV_STATE_CANT_OPEN:
2408 if (aux == VDEV_AUX_CORRUPT_DATA || aux == VDEV_AUX_BAD_LOG)
2410 else if (aux == VDEV_AUX_SPLIT_POOL)
2414 case VDEV_STATE_FAULTED:
2416 case VDEV_STATE_DEGRADED:
2417 return ("DEGRADED");
2418 case VDEV_STATE_HEALTHY:
2428 spa_top_vdevs_spacemap_addressable(spa_t *spa)
2430 vdev_t *rvd = spa->spa_root_vdev;
2431 for (uint64_t c = 0; c < rvd->vdev_children; c++) {
2432 if (!vdev_is_spacemap_addressable(rvd->vdev_child[c]))
2439 spa_has_checkpoint(spa_t *spa)
2441 return (spa->spa_checkpoint_txg != 0);
2445 spa_importing_readonly_checkpoint(spa_t *spa)
2447 return ((spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT) &&
2448 spa->spa_mode == FREAD);
2452 spa_min_claim_txg(spa_t *spa)
2454 uint64_t checkpoint_txg = spa->spa_uberblock.ub_checkpoint_txg;
2456 if (checkpoint_txg != 0)
2457 return (checkpoint_txg + 1);
2459 return (spa->spa_first_txg);
2463 * If there is a checkpoint, async destroys may consume more space from
2464 * the pool instead of freeing it. In an attempt to save the pool from
2465 * getting suspended when it is about to run out of space, we stop
2466 * processing async destroys.
2469 spa_suspend_async_destroy(spa_t *spa)
2471 dsl_pool_t *dp = spa_get_dsl(spa);
2473 uint64_t unreserved = dsl_pool_unreserved_space(dp,
2474 ZFS_SPACE_CHECK_EXTRA_RESERVED);
2475 uint64_t used = dsl_dir_phys(dp->dp_root_dir)->dd_used_bytes;
2476 uint64_t avail = (unreserved > used) ? (unreserved - used) : 0;
2478 if (spa_has_checkpoint(spa) && avail == 0)
2484 #if defined(_KERNEL)
2486 #include <linux/mod_compat.h>
2489 param_set_deadman_failmode(const char *val, zfs_kernel_param_t *kp)
2495 return (SET_ERROR(-EINVAL));
2497 if ((p = strchr(val, '\n')) != NULL)
2500 if (strcmp(val, "wait") != 0 && strcmp(val, "continue") != 0 &&
2501 strcmp(val, "panic"))
2502 return (SET_ERROR(-EINVAL));
2504 if (spa_mode_global != 0) {
2505 mutex_enter(&spa_namespace_lock);
2506 while ((spa = spa_next(spa)) != NULL)
2507 spa_set_deadman_failmode(spa, val);
2508 mutex_exit(&spa_namespace_lock);
2511 return (param_set_charp(val, kp));
2515 param_set_deadman_ziotime(const char *val, zfs_kernel_param_t *kp)
2520 error = param_set_ulong(val, kp);
2522 return (SET_ERROR(error));
2524 if (spa_mode_global != 0) {
2525 mutex_enter(&spa_namespace_lock);
2526 while ((spa = spa_next(spa)) != NULL)
2527 spa->spa_deadman_ziotime =
2528 MSEC2NSEC(zfs_deadman_ziotime_ms);
2529 mutex_exit(&spa_namespace_lock);
2536 param_set_deadman_synctime(const char *val, zfs_kernel_param_t *kp)
2541 error = param_set_ulong(val, kp);
2543 return (SET_ERROR(error));
2545 if (spa_mode_global != 0) {
2546 mutex_enter(&spa_namespace_lock);
2547 while ((spa = spa_next(spa)) != NULL)
2548 spa->spa_deadman_synctime =
2549 MSEC2NSEC(zfs_deadman_synctime_ms);
2550 mutex_exit(&spa_namespace_lock);
2556 /* Namespace manipulation */
2557 EXPORT_SYMBOL(spa_lookup);
2558 EXPORT_SYMBOL(spa_add);
2559 EXPORT_SYMBOL(spa_remove);
2560 EXPORT_SYMBOL(spa_next);
2562 /* Refcount functions */
2563 EXPORT_SYMBOL(spa_open_ref);
2564 EXPORT_SYMBOL(spa_close);
2565 EXPORT_SYMBOL(spa_refcount_zero);
2567 /* Pool configuration lock */
2568 EXPORT_SYMBOL(spa_config_tryenter);
2569 EXPORT_SYMBOL(spa_config_enter);
2570 EXPORT_SYMBOL(spa_config_exit);
2571 EXPORT_SYMBOL(spa_config_held);
2573 /* Pool vdev add/remove lock */
2574 EXPORT_SYMBOL(spa_vdev_enter);
2575 EXPORT_SYMBOL(spa_vdev_exit);
2577 /* Pool vdev state change lock */
2578 EXPORT_SYMBOL(spa_vdev_state_enter);
2579 EXPORT_SYMBOL(spa_vdev_state_exit);
2581 /* Accessor functions */
2582 EXPORT_SYMBOL(spa_shutting_down);
2583 EXPORT_SYMBOL(spa_get_dsl);
2584 EXPORT_SYMBOL(spa_get_rootblkptr);
2585 EXPORT_SYMBOL(spa_set_rootblkptr);
2586 EXPORT_SYMBOL(spa_altroot);
2587 EXPORT_SYMBOL(spa_sync_pass);
2588 EXPORT_SYMBOL(spa_name);
2589 EXPORT_SYMBOL(spa_guid);
2590 EXPORT_SYMBOL(spa_last_synced_txg);
2591 EXPORT_SYMBOL(spa_first_txg);
2592 EXPORT_SYMBOL(spa_syncing_txg);
2593 EXPORT_SYMBOL(spa_version);
2594 EXPORT_SYMBOL(spa_state);
2595 EXPORT_SYMBOL(spa_load_state);
2596 EXPORT_SYMBOL(spa_freeze_txg);
2597 EXPORT_SYMBOL(spa_get_dspace);
2598 EXPORT_SYMBOL(spa_update_dspace);
2599 EXPORT_SYMBOL(spa_deflate);
2600 EXPORT_SYMBOL(spa_normal_class);
2601 EXPORT_SYMBOL(spa_log_class);
2602 EXPORT_SYMBOL(spa_special_class);
2603 EXPORT_SYMBOL(spa_preferred_class);
2604 EXPORT_SYMBOL(spa_max_replication);
2605 EXPORT_SYMBOL(spa_prev_software_version);
2606 EXPORT_SYMBOL(spa_get_failmode);
2607 EXPORT_SYMBOL(spa_suspended);
2608 EXPORT_SYMBOL(spa_bootfs);
2609 EXPORT_SYMBOL(spa_delegation);
2610 EXPORT_SYMBOL(spa_meta_objset);
2611 EXPORT_SYMBOL(spa_maxblocksize);
2612 EXPORT_SYMBOL(spa_maxdnodesize);
2614 /* Miscellaneous support routines */
2615 EXPORT_SYMBOL(spa_rename);
2616 EXPORT_SYMBOL(spa_guid_exists);
2617 EXPORT_SYMBOL(spa_strdup);
2618 EXPORT_SYMBOL(spa_strfree);
2619 EXPORT_SYMBOL(spa_get_random);
2620 EXPORT_SYMBOL(spa_generate_guid);
2621 EXPORT_SYMBOL(snprintf_blkptr);
2622 EXPORT_SYMBOL(spa_freeze);
2623 EXPORT_SYMBOL(spa_upgrade);
2624 EXPORT_SYMBOL(spa_evict_all);
2625 EXPORT_SYMBOL(spa_lookup_by_guid);
2626 EXPORT_SYMBOL(spa_has_spare);
2627 EXPORT_SYMBOL(dva_get_dsize_sync);
2628 EXPORT_SYMBOL(bp_get_dsize_sync);
2629 EXPORT_SYMBOL(bp_get_dsize);
2630 EXPORT_SYMBOL(spa_has_slogs);
2631 EXPORT_SYMBOL(spa_is_root);
2632 EXPORT_SYMBOL(spa_writeable);
2633 EXPORT_SYMBOL(spa_mode);
2634 EXPORT_SYMBOL(spa_namespace_lock);
2635 EXPORT_SYMBOL(spa_trust_config);
2636 EXPORT_SYMBOL(spa_missing_tvds_allowed);
2637 EXPORT_SYMBOL(spa_set_missing_tvds);
2638 EXPORT_SYMBOL(spa_state_to_name);
2639 EXPORT_SYMBOL(spa_importing_readonly_checkpoint);
2640 EXPORT_SYMBOL(spa_min_claim_txg);
2641 EXPORT_SYMBOL(spa_suspend_async_destroy);
2642 EXPORT_SYMBOL(spa_has_checkpoint);
2643 EXPORT_SYMBOL(spa_top_vdevs_spacemap_addressable);
2646 module_param(zfs_flags, uint, 0644);
2647 MODULE_PARM_DESC(zfs_flags, "Set additional debugging flags");
2649 module_param(zfs_recover, int, 0644);
2650 MODULE_PARM_DESC(zfs_recover, "Set to attempt to recover from fatal errors");
2652 module_param(zfs_free_leak_on_eio, int, 0644);
2653 MODULE_PARM_DESC(zfs_free_leak_on_eio,
2654 "Set to ignore IO errors during free and permanently leak the space");
2656 module_param_call(zfs_deadman_synctime_ms, param_set_deadman_synctime,
2657 param_get_ulong, &zfs_deadman_synctime_ms, 0644);
2658 MODULE_PARM_DESC(zfs_deadman_synctime_ms,
2659 "Pool sync expiration time in milliseconds");
2661 module_param_call(zfs_deadman_ziotime_ms, param_set_deadman_ziotime,
2662 param_get_ulong, &zfs_deadman_ziotime_ms, 0644);
2663 MODULE_PARM_DESC(zfs_deadman_ziotime_ms,
2664 "IO expiration time in milliseconds");
2666 module_param(zfs_deadman_checktime_ms, ulong, 0644);
2667 MODULE_PARM_DESC(zfs_deadman_checktime_ms,
2668 "Dead I/O check interval in milliseconds");
2670 module_param(zfs_deadman_enabled, int, 0644);
2671 MODULE_PARM_DESC(zfs_deadman_enabled, "Enable deadman timer");
2673 module_param_call(zfs_deadman_failmode, param_set_deadman_failmode,
2674 param_get_charp, &zfs_deadman_failmode, 0644);
2675 MODULE_PARM_DESC(zfs_deadman_failmode, "Failmode for deadman timer");
2677 module_param(spa_asize_inflation, int, 0644);
2678 MODULE_PARM_DESC(spa_asize_inflation,
2679 "SPA size estimate multiplication factor");
2681 module_param(spa_slop_shift, int, 0644);
2682 MODULE_PARM_DESC(spa_slop_shift, "Reserved free space in pool");
2684 module_param(zfs_ddt_data_is_special, int, 0644);
2685 MODULE_PARM_DESC(zfs_ddt_data_is_special,
2686 "Place DDT data into the special class");
2688 module_param(zfs_user_indirect_is_special, int, 0644);
2689 MODULE_PARM_DESC(zfs_user_indirect_is_special,
2690 "Place user data indirect blocks into the special class");