xref: /illumos-gate/usr/src/uts/common/fs/zfs/spa_misc.c (revision 3f9d6ad73e45c6823b409f93b0c8d4f62861d2d5)
1fa9e4066Sahrens /*
2fa9e4066Sahrens  * CDDL HEADER START
3fa9e4066Sahrens  *
4fa9e4066Sahrens  * The contents of this file are subject to the terms of the
5ea8dc4b6Seschrock  * Common Development and Distribution License (the "License").
6ea8dc4b6Seschrock  * You may not use this file except in compliance with the License.
7fa9e4066Sahrens  *
8fa9e4066Sahrens  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9fa9e4066Sahrens  * or http://www.opensolaris.org/os/licensing.
10fa9e4066Sahrens  * See the License for the specific language governing permissions
11fa9e4066Sahrens  * and limitations under the License.
12fa9e4066Sahrens  *
13fa9e4066Sahrens  * When distributing Covered Code, include this CDDL HEADER in each
14fa9e4066Sahrens  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15fa9e4066Sahrens  * If applicable, add the following below this CDDL HEADER, with the
16fa9e4066Sahrens  * fields enclosed by brackets "[]" replaced with your own identifying
17fa9e4066Sahrens  * information: Portions Copyright [yyyy] [name of copyright owner]
18fa9e4066Sahrens  *
19fa9e4066Sahrens  * CDDL HEADER END
20fa9e4066Sahrens  */
21fa9e4066Sahrens /*
229842588bSGeorge Wilson  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23fa9e4066Sahrens  */
24fa9e4066Sahrens 
25fa9e4066Sahrens #include <sys/zfs_context.h>
26fa9e4066Sahrens #include <sys/spa_impl.h>
27fa9e4066Sahrens #include <sys/zio.h>
28fa9e4066Sahrens #include <sys/zio_checksum.h>
29fa9e4066Sahrens #include <sys/zio_compress.h>
30fa9e4066Sahrens #include <sys/dmu.h>
31fa9e4066Sahrens #include <sys/dmu_tx.h>
32fa9e4066Sahrens #include <sys/zap.h>
33fa9e4066Sahrens #include <sys/zil.h>
34fa9e4066Sahrens #include <sys/vdev_impl.h>
35fa9e4066Sahrens #include <sys/metaslab.h>
36fa9e4066Sahrens #include <sys/uberblock_impl.h>
37fa9e4066Sahrens #include <sys/txg.h>
38fa9e4066Sahrens #include <sys/avl.h>
39fa9e4066Sahrens #include <sys/unique.h>
40fa9e4066Sahrens #include <sys/dsl_pool.h>
41fa9e4066Sahrens #include <sys/dsl_dir.h>
42fa9e4066Sahrens #include <sys/dsl_prop.h>
43*3f9d6ad7SLin Ling #include <sys/dsl_scan.h>
44fa9e4066Sahrens #include <sys/fs/zfs.h>
456ce0521aSperrin #include <sys/metaslab_impl.h>
46e14bb325SJeff Bonwick #include <sys/arc.h>
47485bbbf5SGeorge Wilson #include <sys/ddt.h>
4891ebeef5Sahrens #include "zfs_prop.h"
49fa9e4066Sahrens 
50fa9e4066Sahrens /*
51fa9e4066Sahrens  * SPA locking
52fa9e4066Sahrens  *
53fa9e4066Sahrens  * There are four basic locks for managing spa_t structures:
54fa9e4066Sahrens  *
55fa9e4066Sahrens  * spa_namespace_lock (global mutex)
56fa9e4066Sahrens  *
5744cd46caSbillm  *	This lock must be acquired to do any of the following:
58fa9e4066Sahrens  *
5944cd46caSbillm  *		- Lookup a spa_t by name
6044cd46caSbillm  *		- Add or remove a spa_t from the namespace
6144cd46caSbillm  *		- Increase spa_refcount from non-zero
6244cd46caSbillm  *		- Check if spa_refcount is zero
6344cd46caSbillm  *		- Rename a spa_t
64ea8dc4b6Seschrock  *		- add/remove/attach/detach devices
6544cd46caSbillm  *		- Held for the duration of create/destroy/import/export
66fa9e4066Sahrens  *
6744cd46caSbillm  *	It does not need to handle recursion.  A create or destroy may
6844cd46caSbillm  *	reference objects (files or zvols) in other pools, but by
6944cd46caSbillm  *	definition they must have an existing reference, and will never need
7044cd46caSbillm  *	to lookup a spa_t by name.
71fa9e4066Sahrens  *
72fa9e4066Sahrens  * spa_refcount (per-spa refcount_t protected by mutex)
73fa9e4066Sahrens  *
7444cd46caSbillm  *	This reference count keep track of any active users of the spa_t.  The
7544cd46caSbillm  *	spa_t cannot be destroyed or freed while this is non-zero.  Internally,
7644cd46caSbillm  *	the refcount is never really 'zero' - opening a pool implicitly keeps
77088f3894Sahrens  *	some references in the DMU.  Internally we check against spa_minref, but
7844cd46caSbillm  *	present the image of a zero/non-zero value to consumers.
79fa9e4066Sahrens  *
80e14bb325SJeff Bonwick  * spa_config_lock[] (per-spa array of rwlocks)
81fa9e4066Sahrens  *
8291ebeef5Sahrens  *	This protects the spa_t from config changes, and must be held in
8391ebeef5Sahrens  *	the following circumstances:
84fa9e4066Sahrens  *
8544cd46caSbillm  *		- RW_READER to perform I/O to the spa
8644cd46caSbillm  *		- RW_WRITER to change the vdev config
87fa9e4066Sahrens  *
88fa9e4066Sahrens  * The locking order is fairly straightforward:
89fa9e4066Sahrens  *
9044cd46caSbillm  *		spa_namespace_lock	->	spa_refcount
91fa9e4066Sahrens  *
9244cd46caSbillm  *	The namespace lock must be acquired to increase the refcount from 0
9344cd46caSbillm  *	or to check if it is zero.
94fa9e4066Sahrens  *
95e14bb325SJeff Bonwick  *		spa_refcount		->	spa_config_lock[]
96fa9e4066Sahrens  *
9744cd46caSbillm  *	There must be at least one valid reference on the spa_t to acquire
9844cd46caSbillm  *	the config lock.
99fa9e4066Sahrens  *
100e14bb325SJeff Bonwick  *		spa_namespace_lock	->	spa_config_lock[]
101fa9e4066Sahrens  *
10244cd46caSbillm  *	The namespace lock must always be taken before the config lock.
103fa9e4066Sahrens  *
104fa9e4066Sahrens  *
105e14bb325SJeff Bonwick  * The spa_namespace_lock can be acquired directly and is globally visible.
106fa9e4066Sahrens  *
107e14bb325SJeff Bonwick  * The namespace is manipulated using the following functions, all of which
108e14bb325SJeff Bonwick  * require the spa_namespace_lock to be held.
109fa9e4066Sahrens  *
11044cd46caSbillm  *	spa_lookup()		Lookup a spa_t by name.
111fa9e4066Sahrens  *
11244cd46caSbillm  *	spa_add()		Create a new spa_t in the namespace.
113fa9e4066Sahrens  *
11444cd46caSbillm  *	spa_remove()		Remove a spa_t from the namespace.  This also
11544cd46caSbillm  *				frees up any memory associated with the spa_t.
116fa9e4066Sahrens  *
11744cd46caSbillm  *	spa_next()		Returns the next spa_t in the system, or the
11844cd46caSbillm  *				first if NULL is passed.
119fa9e4066Sahrens  *
12044cd46caSbillm  *	spa_evict_all()		Shutdown and remove all spa_t structures in
12144cd46caSbillm  *				the system.
122fa9e4066Sahrens  *
123ea8dc4b6Seschrock  *	spa_guid_exists()	Determine whether a pool/device guid exists.
124fa9e4066Sahrens  *
125fa9e4066Sahrens  * The spa_refcount is manipulated using the following functions:
126fa9e4066Sahrens  *
12744cd46caSbillm  *	spa_open_ref()		Adds a reference to the given spa_t.  Must be
12844cd46caSbillm  *				called with spa_namespace_lock held if the
12944cd46caSbillm  *				refcount is currently zero.
130fa9e4066Sahrens  *
13144cd46caSbillm  *	spa_close()		Remove a reference from the spa_t.  This will
13244cd46caSbillm  *				not free the spa_t or remove it from the
13344cd46caSbillm  *				namespace.  No locking is required.
134fa9e4066Sahrens  *
13544cd46caSbillm  *	spa_refcount_zero()	Returns true if the refcount is currently
13644cd46caSbillm  *				zero.  Must be called with spa_namespace_lock
13744cd46caSbillm  *				held.
138fa9e4066Sahrens  *
139e14bb325SJeff Bonwick  * The spa_config_lock[] is an array of rwlocks, ordered as follows:
140e14bb325SJeff Bonwick  * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
141e14bb325SJeff Bonwick  * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
142e14bb325SJeff Bonwick  *
143e14bb325SJeff Bonwick  * To read the configuration, it suffices to hold one of these locks as reader.
144e14bb325SJeff Bonwick  * To modify the configuration, you must hold all locks as writer.  To modify
145e14bb325SJeff Bonwick  * vdev state without altering the vdev tree's topology (e.g. online/offline),
146e14bb325SJeff Bonwick  * you must hold SCL_STATE and SCL_ZIO as writer.
147e14bb325SJeff Bonwick  *
148e14bb325SJeff Bonwick  * We use these distinct config locks to avoid recursive lock entry.
149e14bb325SJeff Bonwick  * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
150e14bb325SJeff Bonwick  * block allocations (SCL_ALLOC), which may require reading space maps
151e14bb325SJeff Bonwick  * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
152e14bb325SJeff Bonwick  *
153e14bb325SJeff Bonwick  * The spa config locks cannot be normal rwlocks because we need the
154e14bb325SJeff Bonwick  * ability to hand off ownership.  For example, SCL_ZIO is acquired
155e14bb325SJeff Bonwick  * by the issuing thread and later released by an interrupt thread.
156e14bb325SJeff Bonwick  * They do, however, obey the usual write-wanted semantics to prevent
157e14bb325SJeff Bonwick  * writer (i.e. system administrator) starvation.
158e14bb325SJeff Bonwick  *
159e14bb325SJeff Bonwick  * The lock acquisition rules are as follows:
160e14bb325SJeff Bonwick  *
161e14bb325SJeff Bonwick  * SCL_CONFIG
162e14bb325SJeff Bonwick  *	Protects changes to the vdev tree topology, such as vdev
163e14bb325SJeff Bonwick  *	add/remove/attach/detach.  Protects the dirty config list
164e14bb325SJeff Bonwick  *	(spa_config_dirty_list) and the set of spares and l2arc devices.
165e14bb325SJeff Bonwick  *
166e14bb325SJeff Bonwick  * SCL_STATE
167e14bb325SJeff Bonwick  *	Protects changes to pool state and vdev state, such as vdev
168e14bb325SJeff Bonwick  *	online/offline/fault/degrade/clear.  Protects the dirty state list
169e14bb325SJeff Bonwick  *	(spa_state_dirty_list) and global pool state (spa_state).
170e14bb325SJeff Bonwick  *
171e14bb325SJeff Bonwick  * SCL_ALLOC
172e14bb325SJeff Bonwick  *	Protects changes to metaslab groups and classes.
173e14bb325SJeff Bonwick  *	Held as reader by metaslab_alloc() and metaslab_claim().
174e14bb325SJeff Bonwick  *
175e14bb325SJeff Bonwick  * SCL_ZIO
176e14bb325SJeff Bonwick  *	Held by bp-level zios (those which have no io_vd upon entry)
177e14bb325SJeff Bonwick  *	to prevent changes to the vdev tree.  The bp-level zio implicitly
178e14bb325SJeff Bonwick  *	protects all of its vdev child zios, which do not hold SCL_ZIO.
179e14bb325SJeff Bonwick  *
180e14bb325SJeff Bonwick  * SCL_FREE
181e14bb325SJeff Bonwick  *	Protects changes to metaslab groups and classes.
182e14bb325SJeff Bonwick  *	Held as reader by metaslab_free().  SCL_FREE is distinct from
183e14bb325SJeff Bonwick  *	SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
184e14bb325SJeff Bonwick  *	blocks in zio_done() while another i/o that holds either
185e14bb325SJeff Bonwick  *	SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
186e14bb325SJeff Bonwick  *
187e14bb325SJeff Bonwick  * SCL_VDEV
188e14bb325SJeff Bonwick  *	Held as reader to prevent changes to the vdev tree during trivial
189b24ab676SJeff Bonwick  *	inquiries such as bp_get_dsize().  SCL_VDEV is distinct from the
190e14bb325SJeff Bonwick  *	other locks, and lower than all of them, to ensure that it's safe
191e14bb325SJeff Bonwick  *	to acquire regardless of caller context.
192e14bb325SJeff Bonwick  *
193e14bb325SJeff Bonwick  * In addition, the following rules apply:
194e14bb325SJeff Bonwick  *
195e14bb325SJeff Bonwick  * (a)	spa_props_lock protects pool properties, spa_config and spa_config_list.
196e14bb325SJeff Bonwick  *	The lock ordering is SCL_CONFIG > spa_props_lock.
197e14bb325SJeff Bonwick  *
198e14bb325SJeff Bonwick  * (b)	I/O operations on leaf vdevs.  For any zio operation that takes
199e14bb325SJeff Bonwick  *	an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
200e14bb325SJeff Bonwick  *	or zio_write_phys() -- the caller must ensure that the config cannot
201e14bb325SJeff Bonwick  *	cannot change in the interim, and that the vdev cannot be reopened.
202e14bb325SJeff Bonwick  *	SCL_STATE as reader suffices for both.
203fa9e4066Sahrens  *
204ea8dc4b6Seschrock  * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
205fa9e4066Sahrens  *
20644cd46caSbillm  *	spa_vdev_enter()	Acquire the namespace lock and the config lock
207ea8dc4b6Seschrock  *				for writing.
208fa9e4066Sahrens  *
20944cd46caSbillm  *	spa_vdev_exit()		Release the config lock, wait for all I/O
21044cd46caSbillm  *				to complete, sync the updated configs to the
211ea8dc4b6Seschrock  *				cache, and release the namespace lock.
212fa9e4066Sahrens  *
213e14bb325SJeff Bonwick  * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
214e14bb325SJeff Bonwick  * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
215e14bb325SJeff Bonwick  * locking is, always, based on spa_namespace_lock and spa_config_lock[].
216e14bb325SJeff Bonwick  *
217e14bb325SJeff Bonwick  * spa_rename() is also implemented within this file since is requires
218e14bb325SJeff Bonwick  * manipulation of the namespace.
219fa9e4066Sahrens  */
220fa9e4066Sahrens 
221fa9e4066Sahrens static avl_tree_t spa_namespace_avl;
222fa9e4066Sahrens kmutex_t spa_namespace_lock;
223fa9e4066Sahrens static kcondvar_t spa_namespace_cv;
2240373e76bSbonwick static int spa_active_count;
225416e0cd8Sek int spa_max_replication_override = SPA_DVAS_PER_BP;
226fa9e4066Sahrens 
22799653d4eSeschrock static kmutex_t spa_spare_lock;
22839c23413Seschrock static avl_tree_t spa_spare_avl;
229fa94a07fSbrendan static kmutex_t spa_l2cache_lock;
230fa94a07fSbrendan static avl_tree_t spa_l2cache_avl;
23199653d4eSeschrock 
232fa9e4066Sahrens kmem_cache_t *spa_buffer_pool;
2338ad4d6ddSJeff Bonwick int spa_mode_global;
234fa9e4066Sahrens 
235fa9e4066Sahrens #ifdef ZFS_DEBUG
23640feaa91Sahrens /* Everything except dprintf is on by default in debug builds */
23740feaa91Sahrens int zfs_flags = ~ZFS_DEBUG_DPRINTF;
238fa9e4066Sahrens #else
239fa9e4066Sahrens int zfs_flags = 0;
240fa9e4066Sahrens #endif
241fa9e4066Sahrens 
2420125049cSahrens /*
2430125049cSahrens  * zfs_recover can be set to nonzero to attempt to recover from
2440125049cSahrens  * otherwise-fatal errors, typically caused by on-disk corruption.  When
2450125049cSahrens  * set, calls to zfs_panic_recover() will turn into warning messages.
2460125049cSahrens  */
2470125049cSahrens int zfs_recover = 0;
2480125049cSahrens 
249fa9e4066Sahrens 
250e05725b1Sbonwick /*
251e05725b1Sbonwick  * ==========================================================================
252e05725b1Sbonwick  * SPA config locking
253e05725b1Sbonwick  * ==========================================================================
254e05725b1Sbonwick  */
255e05725b1Sbonwick static void
256e14bb325SJeff Bonwick spa_config_lock_init(spa_t *spa)
257e14bb325SJeff Bonwick {
258e14bb325SJeff Bonwick 	for (int i = 0; i < SCL_LOCKS; i++) {
259e14bb325SJeff Bonwick 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
260e14bb325SJeff Bonwick 		mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL);
261e14bb325SJeff Bonwick 		cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL);
262e14bb325SJeff Bonwick 		refcount_create(&scl->scl_count);
263e14bb325SJeff Bonwick 		scl->scl_writer = NULL;
264e14bb325SJeff Bonwick 		scl->scl_write_wanted = 0;
265e14bb325SJeff Bonwick 	}
266e05725b1Sbonwick }
267e05725b1Sbonwick 
268e05725b1Sbonwick static void
269e14bb325SJeff Bonwick spa_config_lock_destroy(spa_t *spa)
270e14bb325SJeff Bonwick {
271e14bb325SJeff Bonwick 	for (int i = 0; i < SCL_LOCKS; i++) {
272e14bb325SJeff Bonwick 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
273e14bb325SJeff Bonwick 		mutex_destroy(&scl->scl_lock);
274e14bb325SJeff Bonwick 		cv_destroy(&scl->scl_cv);
275e14bb325SJeff Bonwick 		refcount_destroy(&scl->scl_count);
276e14bb325SJeff Bonwick 		ASSERT(scl->scl_writer == NULL);
277e14bb325SJeff Bonwick 		ASSERT(scl->scl_write_wanted == 0);
278e14bb325SJeff Bonwick 	}
279e14bb325SJeff Bonwick }
280e14bb325SJeff Bonwick 
281e14bb325SJeff Bonwick int
282e14bb325SJeff Bonwick spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw)
283e05725b1Sbonwick {
284e14bb325SJeff Bonwick 	for (int i = 0; i < SCL_LOCKS; i++) {
285e14bb325SJeff Bonwick 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
286e14bb325SJeff Bonwick 		if (!(locks & (1 << i)))
287e14bb325SJeff Bonwick 			continue;
288e14bb325SJeff Bonwick 		mutex_enter(&scl->scl_lock);
289e14bb325SJeff Bonwick 		if (rw == RW_READER) {
290e14bb325SJeff Bonwick 			if (scl->scl_writer || scl->scl_write_wanted) {
291e14bb325SJeff Bonwick 				mutex_exit(&scl->scl_lock);
292e14bb325SJeff Bonwick 				spa_config_exit(spa, locks ^ (1 << i), tag);
293e14bb325SJeff Bonwick 				return (0);
294e14bb325SJeff Bonwick 			}
295e14bb325SJeff Bonwick 		} else {
296e14bb325SJeff Bonwick 			ASSERT(scl->scl_writer != curthread);
297e14bb325SJeff Bonwick 			if (!refcount_is_zero(&scl->scl_count)) {
298e14bb325SJeff Bonwick 				mutex_exit(&scl->scl_lock);
299e14bb325SJeff Bonwick 				spa_config_exit(spa, locks ^ (1 << i), tag);
300e14bb325SJeff Bonwick 				return (0);
301e14bb325SJeff Bonwick 			}
302e14bb325SJeff Bonwick 			scl->scl_writer = curthread;
303e14bb325SJeff Bonwick 		}
304e14bb325SJeff Bonwick 		(void) refcount_add(&scl->scl_count, tag);
305e14bb325SJeff Bonwick 		mutex_exit(&scl->scl_lock);
306e14bb325SJeff Bonwick 	}
307e14bb325SJeff Bonwick 	return (1);
308e05725b1Sbonwick }
309e05725b1Sbonwick 
310e05725b1Sbonwick void
311e14bb325SJeff Bonwick spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw)
312e05725b1Sbonwick {
313f64c0e34SEric Taylor 	int wlocks_held = 0;
314f64c0e34SEric Taylor 
315e14bb325SJeff Bonwick 	for (int i = 0; i < SCL_LOCKS; i++) {
316e14bb325SJeff Bonwick 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
317f64c0e34SEric Taylor 		if (scl->scl_writer == curthread)
318f64c0e34SEric Taylor 			wlocks_held |= (1 << i);
319e14bb325SJeff Bonwick 		if (!(locks & (1 << i)))
320e14bb325SJeff Bonwick 			continue;
321e14bb325SJeff Bonwick 		mutex_enter(&scl->scl_lock);
322e14bb325SJeff Bonwick 		if (rw == RW_READER) {
323e14bb325SJeff Bonwick 			while (scl->scl_writer || scl->scl_write_wanted) {
324e14bb325SJeff Bonwick 				cv_wait(&scl->scl_cv, &scl->scl_lock);
325e14bb325SJeff Bonwick 			}
326e14bb325SJeff Bonwick 		} else {
327e14bb325SJeff Bonwick 			ASSERT(scl->scl_writer != curthread);
328e14bb325SJeff Bonwick 			while (!refcount_is_zero(&scl->scl_count)) {
329e14bb325SJeff Bonwick 				scl->scl_write_wanted++;
330e14bb325SJeff Bonwick 				cv_wait(&scl->scl_cv, &scl->scl_lock);
331e14bb325SJeff Bonwick 				scl->scl_write_wanted--;
332e14bb325SJeff Bonwick 			}
333e14bb325SJeff Bonwick 			scl->scl_writer = curthread;
334e14bb325SJeff Bonwick 		}
335e14bb325SJeff Bonwick 		(void) refcount_add(&scl->scl_count, tag);
336e14bb325SJeff Bonwick 		mutex_exit(&scl->scl_lock);
337e05725b1Sbonwick 	}
338f64c0e34SEric Taylor 	ASSERT(wlocks_held <= locks);
339e05725b1Sbonwick }
340e05725b1Sbonwick 
341e05725b1Sbonwick void
342e14bb325SJeff Bonwick spa_config_exit(spa_t *spa, int locks, void *tag)
343e05725b1Sbonwick {
344e14bb325SJeff Bonwick 	for (int i = SCL_LOCKS - 1; i >= 0; i--) {
345e14bb325SJeff Bonwick 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
346e14bb325SJeff Bonwick 		if (!(locks & (1 << i)))
347e14bb325SJeff Bonwick 			continue;
348e14bb325SJeff Bonwick 		mutex_enter(&scl->scl_lock);
349e14bb325SJeff Bonwick 		ASSERT(!refcount_is_zero(&scl->scl_count));
350e14bb325SJeff Bonwick 		if (refcount_remove(&scl->scl_count, tag) == 0) {
351e14bb325SJeff Bonwick 			ASSERT(scl->scl_writer == NULL ||
352e14bb325SJeff Bonwick 			    scl->scl_writer == curthread);
353e14bb325SJeff Bonwick 			scl->scl_writer = NULL;	/* OK in either case */
354e14bb325SJeff Bonwick 			cv_broadcast(&scl->scl_cv);
355e14bb325SJeff Bonwick 		}
356e14bb325SJeff Bonwick 		mutex_exit(&scl->scl_lock);
357e05725b1Sbonwick 	}
358e05725b1Sbonwick }
359e05725b1Sbonwick 
360e14bb325SJeff Bonwick int
361e14bb325SJeff Bonwick spa_config_held(spa_t *spa, int locks, krw_t rw)
362e05725b1Sbonwick {
363e14bb325SJeff Bonwick 	int locks_held = 0;
364e05725b1Sbonwick 
365e14bb325SJeff Bonwick 	for (int i = 0; i < SCL_LOCKS; i++) {
366e14bb325SJeff Bonwick 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
367e14bb325SJeff Bonwick 		if (!(locks & (1 << i)))
368e14bb325SJeff Bonwick 			continue;
369e14bb325SJeff Bonwick 		if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) ||
370e14bb325SJeff Bonwick 		    (rw == RW_WRITER && scl->scl_writer == curthread))
371e14bb325SJeff Bonwick 			locks_held |= 1 << i;
372e14bb325SJeff Bonwick 	}
373e14bb325SJeff Bonwick 
374e14bb325SJeff Bonwick 	return (locks_held);
375e05725b1Sbonwick }
376e05725b1Sbonwick 
377fa9e4066Sahrens /*
378fa9e4066Sahrens  * ==========================================================================
379fa9e4066Sahrens  * SPA namespace functions
380fa9e4066Sahrens  * ==========================================================================
381fa9e4066Sahrens  */
382fa9e4066Sahrens 
383fa9e4066Sahrens /*
384fa9e4066Sahrens  * Lookup the named spa_t in the AVL tree.  The spa_namespace_lock must be held.
385fa9e4066Sahrens  * Returns NULL if no matching spa_t is found.
386fa9e4066Sahrens  */
387fa9e4066Sahrens spa_t *
388fa9e4066Sahrens spa_lookup(const char *name)
389fa9e4066Sahrens {
390e14bb325SJeff Bonwick 	static spa_t search;	/* spa_t is large; don't allocate on stack */
391e14bb325SJeff Bonwick 	spa_t *spa;
392fa9e4066Sahrens 	avl_index_t where;
39340feaa91Sahrens 	char c;
39440feaa91Sahrens 	char *cp;
395fa9e4066Sahrens 
396fa9e4066Sahrens 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
397fa9e4066Sahrens 
39840feaa91Sahrens 	/*
39940feaa91Sahrens 	 * If it's a full dataset name, figure out the pool name and
40040feaa91Sahrens 	 * just use that.
40140feaa91Sahrens 	 */
40240feaa91Sahrens 	cp = strpbrk(name, "/@");
40340feaa91Sahrens 	if (cp) {
40440feaa91Sahrens 		c = *cp;
40540feaa91Sahrens 		*cp = '\0';
40640feaa91Sahrens 	}
40740feaa91Sahrens 
408e14bb325SJeff Bonwick 	(void) strlcpy(search.spa_name, name, sizeof (search.spa_name));
409fa9e4066Sahrens 	spa = avl_find(&spa_namespace_avl, &search, &where);
410fa9e4066Sahrens 
41140feaa91Sahrens 	if (cp)
41240feaa91Sahrens 		*cp = c;
41340feaa91Sahrens 
414fa9e4066Sahrens 	return (spa);
415fa9e4066Sahrens }
416fa9e4066Sahrens 
417fa9e4066Sahrens /*
418fa9e4066Sahrens  * Create an uninitialized spa_t with the given name.  Requires
419fa9e4066Sahrens  * spa_namespace_lock.  The caller must ensure that the spa_t doesn't already
420fa9e4066Sahrens  * exist by calling spa_lookup() first.
421fa9e4066Sahrens  */
422fa9e4066Sahrens spa_t *
423468c413aSTim Haley spa_add(const char *name, nvlist_t *config, const char *altroot)
424fa9e4066Sahrens {
425fa9e4066Sahrens 	spa_t *spa;
426c5904d13Seschrock 	spa_config_dirent_t *dp;
427fa9e4066Sahrens 
428fa9e4066Sahrens 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
429fa9e4066Sahrens 
430fa9e4066Sahrens 	spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP);
431fa9e4066Sahrens 
432c25056deSgw 	mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
433c25056deSgw 	mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
43435a5a358SJonathan Adams 	mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL);
435c25056deSgw 	mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL);
43635a5a358SJonathan Adams 	mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL);
437c25056deSgw 	mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL);
43835a5a358SJonathan Adams 	mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL);
439a1521560SJeff Bonwick 	mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL);
440a1521560SJeff Bonwick 	mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL);
441c25056deSgw 
442c25056deSgw 	cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL);
44335a5a358SJonathan Adams 	cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL);
444c25056deSgw 	cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL);
445e14bb325SJeff Bonwick 	cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL);
446c25056deSgw 
447b24ab676SJeff Bonwick 	for (int t = 0; t < TXG_SIZE; t++)
448b24ab676SJeff Bonwick 		bplist_init(&spa->spa_free_bplist[t]);
449b24ab676SJeff Bonwick 	bplist_init(&spa->spa_deferred_bplist);
450b24ab676SJeff Bonwick 
451e14bb325SJeff Bonwick 	(void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name));
452fa9e4066Sahrens 	spa->spa_state = POOL_STATE_UNINITIALIZED;
453fa9e4066Sahrens 	spa->spa_freeze_txg = UINT64_MAX;
4540373e76bSbonwick 	spa->spa_final_txg = UINT64_MAX;
455468c413aSTim Haley 	spa->spa_load_max_txg = UINT64_MAX;
45635a5a358SJonathan Adams 	spa->spa_proc = &p0;
45735a5a358SJonathan Adams 	spa->spa_proc_state = SPA_PROC_NONE;
458fa9e4066Sahrens 
459fa9e4066Sahrens 	refcount_create(&spa->spa_refcount);
460e14bb325SJeff Bonwick 	spa_config_lock_init(spa);
461fa9e4066Sahrens 
462fa9e4066Sahrens 	avl_add(&spa_namespace_avl, spa);
463fa9e4066Sahrens 
4640373e76bSbonwick 	/*
4650373e76bSbonwick 	 * Set the alternate root, if there is one.
4660373e76bSbonwick 	 */
4670373e76bSbonwick 	if (altroot) {
4680373e76bSbonwick 		spa->spa_root = spa_strdup(altroot);
4690373e76bSbonwick 		spa_active_count++;
4700373e76bSbonwick 	}
4710373e76bSbonwick 
472c5904d13Seschrock 	/*
473c5904d13Seschrock 	 * Every pool starts with the default cachefile
474c5904d13Seschrock 	 */
475c5904d13Seschrock 	list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t),
476c5904d13Seschrock 	    offsetof(spa_config_dirent_t, scd_link));
477c5904d13Seschrock 
478c5904d13Seschrock 	dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP);
479ef912c80STim Haley 	dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path);
480c5904d13Seschrock 	list_insert_head(&spa->spa_config_list, dp);
481c5904d13Seschrock 
482468c413aSTim Haley 	if (config != NULL)
483468c413aSTim Haley 		VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0);
484468c413aSTim Haley 
485fa9e4066Sahrens 	return (spa);
486fa9e4066Sahrens }
487fa9e4066Sahrens 
488fa9e4066Sahrens /*
489fa9e4066Sahrens  * Removes a spa_t from the namespace, freeing up any memory used.  Requires
490fa9e4066Sahrens  * spa_namespace_lock.  This is called only after the spa_t has been closed and
491fa9e4066Sahrens  * deactivated.
492fa9e4066Sahrens  */
493fa9e4066Sahrens void
494fa9e4066Sahrens spa_remove(spa_t *spa)
495fa9e4066Sahrens {
496c5904d13Seschrock 	spa_config_dirent_t *dp;
497c5904d13Seschrock 
498fa9e4066Sahrens 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
499fa9e4066Sahrens 	ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
500fa9e4066Sahrens 
5011195e687SMark J Musante 	nvlist_free(spa->spa_config_splitting);
5021195e687SMark J Musante 
503fa9e4066Sahrens 	avl_remove(&spa_namespace_avl, spa);
504fa9e4066Sahrens 	cv_broadcast(&spa_namespace_cv);
505fa9e4066Sahrens 
5060373e76bSbonwick 	if (spa->spa_root) {
507fa9e4066Sahrens 		spa_strfree(spa->spa_root);
5080373e76bSbonwick 		spa_active_count--;
5090373e76bSbonwick 	}
510fa9e4066Sahrens 
511c5904d13Seschrock 	while ((dp = list_head(&spa->spa_config_list)) != NULL) {
512c5904d13Seschrock 		list_remove(&spa->spa_config_list, dp);
513c5904d13Seschrock 		if (dp->scd_path != NULL)
514c5904d13Seschrock 			spa_strfree(dp->scd_path);
515c5904d13Seschrock 		kmem_free(dp, sizeof (spa_config_dirent_t));
516c5904d13Seschrock 	}
517c5904d13Seschrock 
518c5904d13Seschrock 	list_destroy(&spa->spa_config_list);
5192f8aaab3Seschrock 
520fa9e4066Sahrens 	spa_config_set(spa, NULL);
521fa9e4066Sahrens 
522fa9e4066Sahrens 	refcount_destroy(&spa->spa_refcount);
52391ebeef5Sahrens 
524e14bb325SJeff Bonwick 	spa_config_lock_destroy(spa);
525fa9e4066Sahrens 
526b24ab676SJeff Bonwick 	for (int t = 0; t < TXG_SIZE; t++)
527b24ab676SJeff Bonwick 		bplist_fini(&spa->spa_free_bplist[t]);
528b24ab676SJeff Bonwick 	bplist_fini(&spa->spa_deferred_bplist);
529b24ab676SJeff Bonwick 
530c25056deSgw 	cv_destroy(&spa->spa_async_cv);
53135a5a358SJonathan Adams 	cv_destroy(&spa->spa_proc_cv);
532c25056deSgw 	cv_destroy(&spa->spa_scrub_io_cv);
533e14bb325SJeff Bonwick 	cv_destroy(&spa->spa_suspend_cv);
534c25056deSgw 
5355ad82045Snd 	mutex_destroy(&spa->spa_async_lock);
536c25056deSgw 	mutex_destroy(&spa->spa_errlist_lock);
53735a5a358SJonathan Adams 	mutex_destroy(&spa->spa_errlog_lock);
53806eeb2adSek 	mutex_destroy(&spa->spa_history_lock);
53935a5a358SJonathan Adams 	mutex_destroy(&spa->spa_proc_lock);
540b1b8ab34Slling 	mutex_destroy(&spa->spa_props_lock);
54135a5a358SJonathan Adams 	mutex_destroy(&spa->spa_scrub_lock);
542e14bb325SJeff Bonwick 	mutex_destroy(&spa->spa_suspend_lock);
543a1521560SJeff Bonwick 	mutex_destroy(&spa->spa_vdev_top_lock);
5445ad82045Snd 
545fa9e4066Sahrens 	kmem_free(spa, sizeof (spa_t));
546fa9e4066Sahrens }
547fa9e4066Sahrens 
548fa9e4066Sahrens /*
549fa9e4066Sahrens  * Given a pool, return the next pool in the namespace, or NULL if there is
550fa9e4066Sahrens  * none.  If 'prev' is NULL, return the first pool.
551fa9e4066Sahrens  */
552fa9e4066Sahrens spa_t *
553fa9e4066Sahrens spa_next(spa_t *prev)
554fa9e4066Sahrens {
555fa9e4066Sahrens 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
556fa9e4066Sahrens 
557fa9e4066Sahrens 	if (prev)
558fa9e4066Sahrens 		return (AVL_NEXT(&spa_namespace_avl, prev));
559fa9e4066Sahrens 	else
560fa9e4066Sahrens 		return (avl_first(&spa_namespace_avl));
561fa9e4066Sahrens }
562fa9e4066Sahrens 
563fa9e4066Sahrens /*
564fa9e4066Sahrens  * ==========================================================================
565fa9e4066Sahrens  * SPA refcount functions
566fa9e4066Sahrens  * ==========================================================================
567fa9e4066Sahrens  */
568fa9e4066Sahrens 
569fa9e4066Sahrens /*
570fa9e4066Sahrens  * Add a reference to the given spa_t.  Must have at least one reference, or
571fa9e4066Sahrens  * have the namespace lock held.
572fa9e4066Sahrens  */
573fa9e4066Sahrens void
574fa9e4066Sahrens spa_open_ref(spa_t *spa, void *tag)
575fa9e4066Sahrens {
576088f3894Sahrens 	ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref ||
577fa9e4066Sahrens 	    MUTEX_HELD(&spa_namespace_lock));
578fa9e4066Sahrens 	(void) refcount_add(&spa->spa_refcount, tag);
579fa9e4066Sahrens }
580fa9e4066Sahrens 
581fa9e4066Sahrens /*
582fa9e4066Sahrens  * Remove a reference to the given spa_t.  Must have at least one reference, or
583fa9e4066Sahrens  * have the namespace lock held.
584fa9e4066Sahrens  */
585fa9e4066Sahrens void
586fa9e4066Sahrens spa_close(spa_t *spa, void *tag)
587fa9e4066Sahrens {
588088f3894Sahrens 	ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref ||
589fa9e4066Sahrens 	    MUTEX_HELD(&spa_namespace_lock));
590fa9e4066Sahrens 	(void) refcount_remove(&spa->spa_refcount, tag);
591fa9e4066Sahrens }
592fa9e4066Sahrens 
593fa9e4066Sahrens /*
594fa9e4066Sahrens  * Check to see if the spa refcount is zero.  Must be called with
595088f3894Sahrens  * spa_namespace_lock held.  We really compare against spa_minref, which is the
596fa9e4066Sahrens  * number of references acquired when opening a pool
597fa9e4066Sahrens  */
598fa9e4066Sahrens boolean_t
599fa9e4066Sahrens spa_refcount_zero(spa_t *spa)
600fa9e4066Sahrens {
601fa9e4066Sahrens 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
602fa9e4066Sahrens 
603088f3894Sahrens 	return (refcount_count(&spa->spa_refcount) == spa->spa_minref);
604fa9e4066Sahrens }
605fa9e4066Sahrens 
60699653d4eSeschrock /*
60799653d4eSeschrock  * ==========================================================================
608fa94a07fSbrendan  * SPA spare and l2cache tracking
60999653d4eSeschrock  * ==========================================================================
61099653d4eSeschrock  */
61199653d4eSeschrock 
612fa94a07fSbrendan /*
613fa94a07fSbrendan  * Hot spares and cache devices are tracked using the same code below,
614fa94a07fSbrendan  * for 'auxiliary' devices.
615fa94a07fSbrendan  */
616fa94a07fSbrendan 
617fa94a07fSbrendan typedef struct spa_aux {
618fa94a07fSbrendan 	uint64_t	aux_guid;
619fa94a07fSbrendan 	uint64_t	aux_pool;
620fa94a07fSbrendan 	avl_node_t	aux_avl;
621fa94a07fSbrendan 	int		aux_count;
622fa94a07fSbrendan } spa_aux_t;
623fa94a07fSbrendan 
624fa94a07fSbrendan static int
625fa94a07fSbrendan spa_aux_compare(const void *a, const void *b)
626fa94a07fSbrendan {
627fa94a07fSbrendan 	const spa_aux_t *sa = a;
628fa94a07fSbrendan 	const spa_aux_t *sb = b;
629fa94a07fSbrendan 
630fa94a07fSbrendan 	if (sa->aux_guid < sb->aux_guid)
631fa94a07fSbrendan 		return (-1);
632fa94a07fSbrendan 	else if (sa->aux_guid > sb->aux_guid)
633fa94a07fSbrendan 		return (1);
634fa94a07fSbrendan 	else
635fa94a07fSbrendan 		return (0);
636fa94a07fSbrendan }
637fa94a07fSbrendan 
638fa94a07fSbrendan void
639fa94a07fSbrendan spa_aux_add(vdev_t *vd, avl_tree_t *avl)
640fa94a07fSbrendan {
641fa94a07fSbrendan 	avl_index_t where;
642fa94a07fSbrendan 	spa_aux_t search;
643fa94a07fSbrendan 	spa_aux_t *aux;
644fa94a07fSbrendan 
645fa94a07fSbrendan 	search.aux_guid = vd->vdev_guid;
646fa94a07fSbrendan 	if ((aux = avl_find(avl, &search, &where)) != NULL) {
647fa94a07fSbrendan 		aux->aux_count++;
648fa94a07fSbrendan 	} else {
649fa94a07fSbrendan 		aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP);
650fa94a07fSbrendan 		aux->aux_guid = vd->vdev_guid;
651fa94a07fSbrendan 		aux->aux_count = 1;
652fa94a07fSbrendan 		avl_insert(avl, aux, where);
653fa94a07fSbrendan 	}
654fa94a07fSbrendan }
655fa94a07fSbrendan 
656fa94a07fSbrendan void
657fa94a07fSbrendan spa_aux_remove(vdev_t *vd, avl_tree_t *avl)
658fa94a07fSbrendan {
659fa94a07fSbrendan 	spa_aux_t search;
660fa94a07fSbrendan 	spa_aux_t *aux;
661fa94a07fSbrendan 	avl_index_t where;
662fa94a07fSbrendan 
663fa94a07fSbrendan 	search.aux_guid = vd->vdev_guid;
664fa94a07fSbrendan 	aux = avl_find(avl, &search, &where);
665fa94a07fSbrendan 
666fa94a07fSbrendan 	ASSERT(aux != NULL);
667fa94a07fSbrendan 
668fa94a07fSbrendan 	if (--aux->aux_count == 0) {
669fa94a07fSbrendan 		avl_remove(avl, aux);
670fa94a07fSbrendan 		kmem_free(aux, sizeof (spa_aux_t));
671fa94a07fSbrendan 	} else if (aux->aux_pool == spa_guid(vd->vdev_spa)) {
672fa94a07fSbrendan 		aux->aux_pool = 0ULL;
673fa94a07fSbrendan 	}
674fa94a07fSbrendan }
675fa94a07fSbrendan 
676fa94a07fSbrendan boolean_t
67789a89ebfSlling spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl)
678fa94a07fSbrendan {
679fa94a07fSbrendan 	spa_aux_t search, *found;
680fa94a07fSbrendan 
681fa94a07fSbrendan 	search.aux_guid = guid;
68289a89ebfSlling 	found = avl_find(avl, &search, NULL);
683fa94a07fSbrendan 
684fa94a07fSbrendan 	if (pool) {
685fa94a07fSbrendan 		if (found)
686fa94a07fSbrendan 			*pool = found->aux_pool;
687fa94a07fSbrendan 		else
688fa94a07fSbrendan 			*pool = 0ULL;
689fa94a07fSbrendan 	}
690fa94a07fSbrendan 
69189a89ebfSlling 	if (refcnt) {
69289a89ebfSlling 		if (found)
69389a89ebfSlling 			*refcnt = found->aux_count;
69489a89ebfSlling 		else
69589a89ebfSlling 			*refcnt = 0;
69689a89ebfSlling 	}
69789a89ebfSlling 
698fa94a07fSbrendan 	return (found != NULL);
699fa94a07fSbrendan }
700fa94a07fSbrendan 
701fa94a07fSbrendan void
702fa94a07fSbrendan spa_aux_activate(vdev_t *vd, avl_tree_t *avl)
703fa94a07fSbrendan {
704fa94a07fSbrendan 	spa_aux_t search, *found;
705fa94a07fSbrendan 	avl_index_t where;
706fa94a07fSbrendan 
707fa94a07fSbrendan 	search.aux_guid = vd->vdev_guid;
708fa94a07fSbrendan 	found = avl_find(avl, &search, &where);
709fa94a07fSbrendan 	ASSERT(found != NULL);
710fa94a07fSbrendan 	ASSERT(found->aux_pool == 0ULL);
711fa94a07fSbrendan 
712fa94a07fSbrendan 	found->aux_pool = spa_guid(vd->vdev_spa);
713fa94a07fSbrendan }
714fa94a07fSbrendan 
71599653d4eSeschrock /*
71639c23413Seschrock  * Spares are tracked globally due to the following constraints:
71739c23413Seschrock  *
71839c23413Seschrock  * 	- A spare may be part of multiple pools.
71939c23413Seschrock  * 	- A spare may be added to a pool even if it's actively in use within
72039c23413Seschrock  *	  another pool.
72139c23413Seschrock  * 	- A spare in use in any pool can only be the source of a replacement if
72239c23413Seschrock  *	  the target is a spare in the same pool.
72339c23413Seschrock  *
72439c23413Seschrock  * We keep track of all spares on the system through the use of a reference
72539c23413Seschrock  * counted AVL tree.  When a vdev is added as a spare, or used as a replacement
72639c23413Seschrock  * spare, then we bump the reference count in the AVL tree.  In addition, we set
72739c23413Seschrock  * the 'vdev_isspare' member to indicate that the device is a spare (active or
72839c23413Seschrock  * inactive).  When a spare is made active (used to replace a device in the
72939c23413Seschrock  * pool), we also keep track of which pool its been made a part of.
73039c23413Seschrock  *
73139c23413Seschrock  * The 'spa_spare_lock' protects the AVL tree.  These functions are normally
73239c23413Seschrock  * called under the spa_namespace lock as part of vdev reconfiguration.  The
73339c23413Seschrock  * separate spare lock exists for the status query path, which does not need to
73439c23413Seschrock  * be completely consistent with respect to other vdev configuration changes.
73599653d4eSeschrock  */
73639c23413Seschrock 
73799653d4eSeschrock static int
73899653d4eSeschrock spa_spare_compare(const void *a, const void *b)
73999653d4eSeschrock {
740fa94a07fSbrendan 	return (spa_aux_compare(a, b));
74199653d4eSeschrock }
74299653d4eSeschrock 
74399653d4eSeschrock void
74439c23413Seschrock spa_spare_add(vdev_t *vd)
74599653d4eSeschrock {
74699653d4eSeschrock 	mutex_enter(&spa_spare_lock);
74739c23413Seschrock 	ASSERT(!vd->vdev_isspare);
748fa94a07fSbrendan 	spa_aux_add(vd, &spa_spare_avl);
74939c23413Seschrock 	vd->vdev_isspare = B_TRUE;
75099653d4eSeschrock 	mutex_exit(&spa_spare_lock);
75199653d4eSeschrock }
75299653d4eSeschrock 
75399653d4eSeschrock void
75439c23413Seschrock spa_spare_remove(vdev_t *vd)
75599653d4eSeschrock {
75699653d4eSeschrock 	mutex_enter(&spa_spare_lock);
75739c23413Seschrock 	ASSERT(vd->vdev_isspare);
758fa94a07fSbrendan 	spa_aux_remove(vd, &spa_spare_avl);
75939c23413Seschrock 	vd->vdev_isspare = B_FALSE;
76099653d4eSeschrock 	mutex_exit(&spa_spare_lock);
76199653d4eSeschrock }
76299653d4eSeschrock 
76399653d4eSeschrock boolean_t
76489a89ebfSlling spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt)
76599653d4eSeschrock {
766fa94a07fSbrendan 	boolean_t found;
76799653d4eSeschrock 
76899653d4eSeschrock 	mutex_enter(&spa_spare_lock);
76989a89ebfSlling 	found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl);
77099653d4eSeschrock 	mutex_exit(&spa_spare_lock);
77199653d4eSeschrock 
772fa94a07fSbrendan 	return (found);
77339c23413Seschrock }
77439c23413Seschrock 
77539c23413Seschrock void
77639c23413Seschrock spa_spare_activate(vdev_t *vd)
77739c23413Seschrock {
77839c23413Seschrock 	mutex_enter(&spa_spare_lock);
77939c23413Seschrock 	ASSERT(vd->vdev_isspare);
780fa94a07fSbrendan 	spa_aux_activate(vd, &spa_spare_avl);
781fa94a07fSbrendan 	mutex_exit(&spa_spare_lock);
782fa94a07fSbrendan }
78339c23413Seschrock 
784fa94a07fSbrendan /*
785fa94a07fSbrendan  * Level 2 ARC devices are tracked globally for the same reasons as spares.
786fa94a07fSbrendan  * Cache devices currently only support one pool per cache device, and so
787fa94a07fSbrendan  * for these devices the aux reference count is currently unused beyond 1.
788fa94a07fSbrendan  */
78939c23413Seschrock 
790fa94a07fSbrendan static int
791fa94a07fSbrendan spa_l2cache_compare(const void *a, const void *b)
792fa94a07fSbrendan {
793fa94a07fSbrendan 	return (spa_aux_compare(a, b));
794fa94a07fSbrendan }
795fa94a07fSbrendan 
796fa94a07fSbrendan void
797fa94a07fSbrendan spa_l2cache_add(vdev_t *vd)
798fa94a07fSbrendan {
799fa94a07fSbrendan 	mutex_enter(&spa_l2cache_lock);
800fa94a07fSbrendan 	ASSERT(!vd->vdev_isl2cache);
801fa94a07fSbrendan 	spa_aux_add(vd, &spa_l2cache_avl);
802fa94a07fSbrendan 	vd->vdev_isl2cache = B_TRUE;
803fa94a07fSbrendan 	mutex_exit(&spa_l2cache_lock);
804fa94a07fSbrendan }
805fa94a07fSbrendan 
806fa94a07fSbrendan void
807fa94a07fSbrendan spa_l2cache_remove(vdev_t *vd)
808fa94a07fSbrendan {
809fa94a07fSbrendan 	mutex_enter(&spa_l2cache_lock);
810fa94a07fSbrendan 	ASSERT(vd->vdev_isl2cache);
811fa94a07fSbrendan 	spa_aux_remove(vd, &spa_l2cache_avl);
812fa94a07fSbrendan 	vd->vdev_isl2cache = B_FALSE;
813fa94a07fSbrendan 	mutex_exit(&spa_l2cache_lock);
814fa94a07fSbrendan }
815fa94a07fSbrendan 
816fa94a07fSbrendan boolean_t
817fa94a07fSbrendan spa_l2cache_exists(uint64_t guid, uint64_t *pool)
818fa94a07fSbrendan {
819fa94a07fSbrendan 	boolean_t found;
820fa94a07fSbrendan 
821fa94a07fSbrendan 	mutex_enter(&spa_l2cache_lock);
82289a89ebfSlling 	found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl);
823fa94a07fSbrendan 	mutex_exit(&spa_l2cache_lock);
824fa94a07fSbrendan 
825fa94a07fSbrendan 	return (found);
826fa94a07fSbrendan }
827fa94a07fSbrendan 
828fa94a07fSbrendan void
829fa94a07fSbrendan spa_l2cache_activate(vdev_t *vd)
830fa94a07fSbrendan {
831fa94a07fSbrendan 	mutex_enter(&spa_l2cache_lock);
832fa94a07fSbrendan 	ASSERT(vd->vdev_isl2cache);
833fa94a07fSbrendan 	spa_aux_activate(vd, &spa_l2cache_avl);
834fa94a07fSbrendan 	mutex_exit(&spa_l2cache_lock);
835fa94a07fSbrendan }
836fa94a07fSbrendan 
837fa9e4066Sahrens /*
838fa9e4066Sahrens  * ==========================================================================
839fa9e4066Sahrens  * SPA vdev locking
840fa9e4066Sahrens  * ==========================================================================
841fa9e4066Sahrens  */
842fa9e4066Sahrens 
843fa9e4066Sahrens /*
844ea8dc4b6Seschrock  * Lock the given spa_t for the purpose of adding or removing a vdev.
845ea8dc4b6Seschrock  * Grabs the global spa_namespace_lock plus the spa config lock for writing.
846fa9e4066Sahrens  * It returns the next transaction group for the spa_t.
847fa9e4066Sahrens  */
848fa9e4066Sahrens uint64_t
849fa9e4066Sahrens spa_vdev_enter(spa_t *spa)
850fa9e4066Sahrens {
851a1521560SJeff Bonwick 	mutex_enter(&spa->spa_vdev_top_lock);
852bbfd46c4SJeff Bonwick 	mutex_enter(&spa_namespace_lock);
85388ecc943SGeorge Wilson 	return (spa_vdev_config_enter(spa));
85488ecc943SGeorge Wilson }
85588ecc943SGeorge Wilson 
85688ecc943SGeorge Wilson /*
85788ecc943SGeorge Wilson  * Internal implementation for spa_vdev_enter().  Used when a vdev
85888ecc943SGeorge Wilson  * operation requires multiple syncs (i.e. removing a device) while
85988ecc943SGeorge Wilson  * keeping the spa_namespace_lock held.
86088ecc943SGeorge Wilson  */
86188ecc943SGeorge Wilson uint64_t
86288ecc943SGeorge Wilson spa_vdev_config_enter(spa_t *spa)
86388ecc943SGeorge Wilson {
86488ecc943SGeorge Wilson 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
8653d7072f8Seschrock 
866e14bb325SJeff Bonwick 	spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
867fa9e4066Sahrens 
868fa9e4066Sahrens 	return (spa_last_synced_txg(spa) + 1);
869fa9e4066Sahrens }
870fa9e4066Sahrens 
871fa9e4066Sahrens /*
87288ecc943SGeorge Wilson  * Used in combination with spa_vdev_config_enter() to allow the syncing
87388ecc943SGeorge Wilson  * of multiple transactions without releasing the spa_namespace_lock.
874fa9e4066Sahrens  */
87588ecc943SGeorge Wilson void
87688ecc943SGeorge Wilson spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag)
877fa9e4066Sahrens {
87888ecc943SGeorge Wilson 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
87988ecc943SGeorge Wilson 
8800e34b6a7Sbonwick 	int config_changed = B_FALSE;
881ea8dc4b6Seschrock 
8820373e76bSbonwick 	ASSERT(txg > spa_last_synced_txg(spa));
8830e34b6a7Sbonwick 
884e14bb325SJeff Bonwick 	spa->spa_pending_vdev = NULL;
885e14bb325SJeff Bonwick 
8860e34b6a7Sbonwick 	/*
8870e34b6a7Sbonwick 	 * Reassess the DTLs.
8880e34b6a7Sbonwick 	 */
8890373e76bSbonwick 	vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE);
8900e34b6a7Sbonwick 
8910e34b6a7Sbonwick 	/*
892*3f9d6ad7SLin Ling 	 * If the config changed, notify the scrub that it must restart.
893*3f9d6ad7SLin Ling 	 * This will initiate a resilver if needed.
8940e34b6a7Sbonwick 	 */
895e14bb325SJeff Bonwick 	if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) {
8960e34b6a7Sbonwick 		config_changed = B_TRUE;
8978f18d1faSGeorge Wilson 		spa->spa_config_generation++;
8980e34b6a7Sbonwick 	}
899ea8dc4b6Seschrock 
90088ecc943SGeorge Wilson 	/*
90188ecc943SGeorge Wilson 	 * Verify the metaslab classes.
90288ecc943SGeorge Wilson 	 */
903b24ab676SJeff Bonwick 	ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0);
904b24ab676SJeff Bonwick 	ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0);
90588ecc943SGeorge Wilson 
906e14bb325SJeff Bonwick 	spa_config_exit(spa, SCL_ALL, spa);
907fa9e4066Sahrens 
90888ecc943SGeorge Wilson 	/*
90988ecc943SGeorge Wilson 	 * Panic the system if the specified tag requires it.  This
91088ecc943SGeorge Wilson 	 * is useful for ensuring that configurations are updated
91188ecc943SGeorge Wilson 	 * transactionally.
91288ecc943SGeorge Wilson 	 */
91388ecc943SGeorge Wilson 	if (zio_injection_enabled)
9141195e687SMark J Musante 		zio_handle_panic_injection(spa, tag, 0);
91588ecc943SGeorge Wilson 
916fa9e4066Sahrens 	/*
917fa9e4066Sahrens 	 * Note: this txg_wait_synced() is important because it ensures
918fa9e4066Sahrens 	 * that there won't be more than one config change per txg.
919fa9e4066Sahrens 	 * This allows us to use the txg as the generation number.
920fa9e4066Sahrens 	 */
921fa9e4066Sahrens 	if (error == 0)
922fa9e4066Sahrens 		txg_wait_synced(spa->spa_dsl_pool, txg);
923fa9e4066Sahrens 
924fa9e4066Sahrens 	if (vd != NULL) {
9258ad4d6ddSJeff Bonwick 		ASSERT(!vd->vdev_detached || vd->vdev_dtl_smo.smo_object == 0);
9268ad4d6ddSJeff Bonwick 		spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
927fa9e4066Sahrens 		vdev_free(vd);
9288ad4d6ddSJeff Bonwick 		spa_config_exit(spa, SCL_ALL, spa);
929fa9e4066Sahrens 	}
930fa9e4066Sahrens 
931fa9e4066Sahrens 	/*
9320e34b6a7Sbonwick 	 * If the config changed, update the config cache.
933fa9e4066Sahrens 	 */
9340e34b6a7Sbonwick 	if (config_changed)
935c5904d13Seschrock 		spa_config_sync(spa, B_FALSE, B_TRUE);
93688ecc943SGeorge Wilson }
937ea8dc4b6Seschrock 
93888ecc943SGeorge Wilson /*
93988ecc943SGeorge Wilson  * Unlock the spa_t after adding or removing a vdev.  Besides undoing the
94088ecc943SGeorge Wilson  * locking of spa_vdev_enter(), we also want make sure the transactions have
94188ecc943SGeorge Wilson  * synced to disk, and then update the global configuration cache with the new
94288ecc943SGeorge Wilson  * information.
94388ecc943SGeorge Wilson  */
94488ecc943SGeorge Wilson int
94588ecc943SGeorge Wilson spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error)
94688ecc943SGeorge Wilson {
94788ecc943SGeorge Wilson 	spa_vdev_config_exit(spa, vd, txg, error, FTAG);
948ea8dc4b6Seschrock 	mutex_exit(&spa_namespace_lock);
949bbfd46c4SJeff Bonwick 	mutex_exit(&spa->spa_vdev_top_lock);
950fa9e4066Sahrens 
951fa9e4066Sahrens 	return (error);
952fa9e4066Sahrens }
953fa9e4066Sahrens 
954e14bb325SJeff Bonwick /*
955e14bb325SJeff Bonwick  * Lock the given spa_t for the purpose of changing vdev state.
956e14bb325SJeff Bonwick  */
957e14bb325SJeff Bonwick void
9588f18d1faSGeorge Wilson spa_vdev_state_enter(spa_t *spa, int oplocks)
959e14bb325SJeff Bonwick {
9608f18d1faSGeorge Wilson 	int locks = SCL_STATE_ALL | oplocks;
9618f18d1faSGeorge Wilson 
962dcba9f3fSGeorge Wilson 	/*
963dcba9f3fSGeorge Wilson 	 * Root pools may need to read of the underlying devfs filesystem
964dcba9f3fSGeorge Wilson 	 * when opening up a vdev.  Unfortunately if we're holding the
965dcba9f3fSGeorge Wilson 	 * SCL_ZIO lock it will result in a deadlock when we try to issue
966dcba9f3fSGeorge Wilson 	 * the read from the root filesystem.  Instead we "prefetch"
967dcba9f3fSGeorge Wilson 	 * the associated vnodes that we need prior to opening the
968dcba9f3fSGeorge Wilson 	 * underlying devices and cache them so that we can prevent
969dcba9f3fSGeorge Wilson 	 * any I/O when we are doing the actual open.
970dcba9f3fSGeorge Wilson 	 */
971dcba9f3fSGeorge Wilson 	if (spa_is_root(spa)) {
9729842588bSGeorge Wilson 		int low = locks & ~(SCL_ZIO - 1);
9739842588bSGeorge Wilson 		int high = locks & ~low;
9749842588bSGeorge Wilson 
9759842588bSGeorge Wilson 		spa_config_enter(spa, high, spa, RW_WRITER);
976dcba9f3fSGeorge Wilson 		vdev_hold(spa->spa_root_vdev);
9779842588bSGeorge Wilson 		spa_config_enter(spa, low, spa, RW_WRITER);
978dcba9f3fSGeorge Wilson 	} else {
979dcba9f3fSGeorge Wilson 		spa_config_enter(spa, locks, spa, RW_WRITER);
980dcba9f3fSGeorge Wilson 	}
9818f18d1faSGeorge Wilson 	spa->spa_vdev_locks = locks;
982e14bb325SJeff Bonwick }
983e14bb325SJeff Bonwick 
984e14bb325SJeff Bonwick int
985e14bb325SJeff Bonwick spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error)
986e14bb325SJeff Bonwick {
987c6065d0fSGeorge Wilson 	boolean_t config_changed = B_FALSE;
988c6065d0fSGeorge Wilson 
989b24ab676SJeff Bonwick 	if (vd != NULL || error == 0)
990b24ab676SJeff Bonwick 		vdev_dtl_reassess(vd ? vd->vdev_top : spa->spa_root_vdev,
991b24ab676SJeff Bonwick 		    0, 0, B_FALSE);
992b24ab676SJeff Bonwick 
9938f18d1faSGeorge Wilson 	if (vd != NULL) {
994e14bb325SJeff Bonwick 		vdev_state_dirty(vd->vdev_top);
995c6065d0fSGeorge Wilson 		config_changed = B_TRUE;
9968f18d1faSGeorge Wilson 		spa->spa_config_generation++;
9978f18d1faSGeorge Wilson 	}
998e14bb325SJeff Bonwick 
999dcba9f3fSGeorge Wilson 	if (spa_is_root(spa))
1000dcba9f3fSGeorge Wilson 		vdev_rele(spa->spa_root_vdev);
1001dcba9f3fSGeorge Wilson 
10028f18d1faSGeorge Wilson 	ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL);
10038f18d1faSGeorge Wilson 	spa_config_exit(spa, spa->spa_vdev_locks, spa);
1004e14bb325SJeff Bonwick 
10058ad4d6ddSJeff Bonwick 	/*
10068ad4d6ddSJeff Bonwick 	 * If anything changed, wait for it to sync.  This ensures that,
10078ad4d6ddSJeff Bonwick 	 * from the system administrator's perspective, zpool(1M) commands
10088ad4d6ddSJeff Bonwick 	 * are synchronous.  This is important for things like zpool offline:
10098ad4d6ddSJeff Bonwick 	 * when the command completes, you expect no further I/O from ZFS.
10108ad4d6ddSJeff Bonwick 	 */
10118ad4d6ddSJeff Bonwick 	if (vd != NULL)
10128ad4d6ddSJeff Bonwick 		txg_wait_synced(spa->spa_dsl_pool, 0);
10138ad4d6ddSJeff Bonwick 
1014c6065d0fSGeorge Wilson 	/*
1015c6065d0fSGeorge Wilson 	 * If the config changed, update the config cache.
1016c6065d0fSGeorge Wilson 	 */
1017c6065d0fSGeorge Wilson 	if (config_changed) {
1018c6065d0fSGeorge Wilson 		mutex_enter(&spa_namespace_lock);
1019c6065d0fSGeorge Wilson 		spa_config_sync(spa, B_FALSE, B_TRUE);
1020c6065d0fSGeorge Wilson 		mutex_exit(&spa_namespace_lock);
1021c6065d0fSGeorge Wilson 	}
1022c6065d0fSGeorge Wilson 
1023e14bb325SJeff Bonwick 	return (error);
1024e14bb325SJeff Bonwick }
1025e14bb325SJeff Bonwick 
1026fa9e4066Sahrens /*
1027fa9e4066Sahrens  * ==========================================================================
1028fa9e4066Sahrens  * Miscellaneous functions
1029fa9e4066Sahrens  * ==========================================================================
1030fa9e4066Sahrens  */
1031fa9e4066Sahrens 
1032fa9e4066Sahrens /*
1033fa9e4066Sahrens  * Rename a spa_t.
1034fa9e4066Sahrens  */
1035fa9e4066Sahrens int
1036fa9e4066Sahrens spa_rename(const char *name, const char *newname)
1037fa9e4066Sahrens {
1038fa9e4066Sahrens 	spa_t *spa;
1039fa9e4066Sahrens 	int err;
1040fa9e4066Sahrens 
1041fa9e4066Sahrens 	/*
1042fa9e4066Sahrens 	 * Lookup the spa_t and grab the config lock for writing.  We need to
1043fa9e4066Sahrens 	 * actually open the pool so that we can sync out the necessary labels.
1044fa9e4066Sahrens 	 * It's OK to call spa_open() with the namespace lock held because we
1045ea8dc4b6Seschrock 	 * allow recursive calls for other reasons.
1046fa9e4066Sahrens 	 */
1047fa9e4066Sahrens 	mutex_enter(&spa_namespace_lock);
1048fa9e4066Sahrens 	if ((err = spa_open(name, &spa, FTAG)) != 0) {
1049fa9e4066Sahrens 		mutex_exit(&spa_namespace_lock);
1050fa9e4066Sahrens 		return (err);
1051fa9e4066Sahrens 	}
1052fa9e4066Sahrens 
1053e14bb325SJeff Bonwick 	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1054fa9e4066Sahrens 
1055fa9e4066Sahrens 	avl_remove(&spa_namespace_avl, spa);
1056e14bb325SJeff Bonwick 	(void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name));
1057fa9e4066Sahrens 	avl_add(&spa_namespace_avl, spa);
1058fa9e4066Sahrens 
1059fa9e4066Sahrens 	/*
1060fa9e4066Sahrens 	 * Sync all labels to disk with the new names by marking the root vdev
1061fa9e4066Sahrens 	 * dirty and waiting for it to sync.  It will pick up the new pool name
1062fa9e4066Sahrens 	 * during the sync.
1063fa9e4066Sahrens 	 */
1064fa9e4066Sahrens 	vdev_config_dirty(spa->spa_root_vdev);
1065fa9e4066Sahrens 
1066e14bb325SJeff Bonwick 	spa_config_exit(spa, SCL_ALL, FTAG);
1067fa9e4066Sahrens 
10680373e76bSbonwick 	txg_wait_synced(spa->spa_dsl_pool, 0);
1069fa9e4066Sahrens 
1070fa9e4066Sahrens 	/*
1071fa9e4066Sahrens 	 * Sync the updated config cache.
1072fa9e4066Sahrens 	 */
1073c5904d13Seschrock 	spa_config_sync(spa, B_FALSE, B_TRUE);
1074fa9e4066Sahrens 
1075fa9e4066Sahrens 	spa_close(spa, FTAG);
1076fa9e4066Sahrens 
1077fa9e4066Sahrens 	mutex_exit(&spa_namespace_lock);
1078fa9e4066Sahrens 
1079fa9e4066Sahrens 	return (0);
1080fa9e4066Sahrens }
1081fa9e4066Sahrens 
1082fa9e4066Sahrens /*
1083fa9e4066Sahrens  * Determine whether a pool with given pool_guid exists.  If device_guid is
1084fa9e4066Sahrens  * non-zero, determine whether the pool exists *and* contains a device with the
1085fa9e4066Sahrens  * specified device_guid.
1086fa9e4066Sahrens  */
1087fa9e4066Sahrens boolean_t
1088fa9e4066Sahrens spa_guid_exists(uint64_t pool_guid, uint64_t device_guid)
1089fa9e4066Sahrens {
1090fa9e4066Sahrens 	spa_t *spa;
1091fa9e4066Sahrens 	avl_tree_t *t = &spa_namespace_avl;
1092fa9e4066Sahrens 
1093ea8dc4b6Seschrock 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
1094fa9e4066Sahrens 
1095fa9e4066Sahrens 	for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) {
1096fa9e4066Sahrens 		if (spa->spa_state == POOL_STATE_UNINITIALIZED)
1097fa9e4066Sahrens 			continue;
1098fa9e4066Sahrens 		if (spa->spa_root_vdev == NULL)
1099fa9e4066Sahrens 			continue;
110039c23413Seschrock 		if (spa_guid(spa) == pool_guid) {
110139c23413Seschrock 			if (device_guid == 0)
110239c23413Seschrock 				break;
110339c23413Seschrock 
110439c23413Seschrock 			if (vdev_lookup_by_guid(spa->spa_root_vdev,
110539c23413Seschrock 			    device_guid) != NULL)
110639c23413Seschrock 				break;
110739c23413Seschrock 
110839c23413Seschrock 			/*
11098654d025Sperrin 			 * Check any devices we may be in the process of adding.
111039c23413Seschrock 			 */
111139c23413Seschrock 			if (spa->spa_pending_vdev) {
111239c23413Seschrock 				if (vdev_lookup_by_guid(spa->spa_pending_vdev,
111339c23413Seschrock 				    device_guid) != NULL)
111439c23413Seschrock 					break;
111539c23413Seschrock 			}
111639c23413Seschrock 		}
1117fa9e4066Sahrens 	}
1118fa9e4066Sahrens 
1119fa9e4066Sahrens 	return (spa != NULL);
1120fa9e4066Sahrens }
1121fa9e4066Sahrens 
1122fa9e4066Sahrens char *
1123fa9e4066Sahrens spa_strdup(const char *s)
1124fa9e4066Sahrens {
1125fa9e4066Sahrens 	size_t len;
1126fa9e4066Sahrens 	char *new;
1127fa9e4066Sahrens 
1128fa9e4066Sahrens 	len = strlen(s);
1129fa9e4066Sahrens 	new = kmem_alloc(len + 1, KM_SLEEP);
1130fa9e4066Sahrens 	bcopy(s, new, len);
1131fa9e4066Sahrens 	new[len] = '\0';
1132fa9e4066Sahrens 
1133fa9e4066Sahrens 	return (new);
1134fa9e4066Sahrens }
1135fa9e4066Sahrens 
1136fa9e4066Sahrens void
1137fa9e4066Sahrens spa_strfree(char *s)
1138fa9e4066Sahrens {
1139fa9e4066Sahrens 	kmem_free(s, strlen(s) + 1);
1140fa9e4066Sahrens }
1141fa9e4066Sahrens 
1142fa9e4066Sahrens uint64_t
1143fa9e4066Sahrens spa_get_random(uint64_t range)
1144fa9e4066Sahrens {
1145fa9e4066Sahrens 	uint64_t r;
1146fa9e4066Sahrens 
1147fa9e4066Sahrens 	ASSERT(range != 0);
1148fa9e4066Sahrens 
1149fa9e4066Sahrens 	(void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t));
1150fa9e4066Sahrens 
1151fa9e4066Sahrens 	return (r % range);
1152fa9e4066Sahrens }
1153fa9e4066Sahrens 
11541195e687SMark J Musante uint64_t
11551195e687SMark J Musante spa_generate_guid(spa_t *spa)
11561195e687SMark J Musante {
11571195e687SMark J Musante 	uint64_t guid = spa_get_random(-1ULL);
11581195e687SMark J Musante 
11591195e687SMark J Musante 	if (spa != NULL) {
11601195e687SMark J Musante 		while (guid == 0 || spa_guid_exists(spa_guid(spa), guid))
11611195e687SMark J Musante 			guid = spa_get_random(-1ULL);
11621195e687SMark J Musante 	} else {
11631195e687SMark J Musante 		while (guid == 0 || spa_guid_exists(guid, 0))
11641195e687SMark J Musante 			guid = spa_get_random(-1ULL);
11651195e687SMark J Musante 	}
11661195e687SMark J Musante 
11671195e687SMark J Musante 	return (guid);
11681195e687SMark J Musante }
11691195e687SMark J Musante 
1170fa9e4066Sahrens void
1171b24ab676SJeff Bonwick sprintf_blkptr(char *buf, const blkptr_t *bp)
1172fa9e4066Sahrens {
1173f0ba89beSJeff Bonwick 	char *type = NULL;
1174f0ba89beSJeff Bonwick 	char *checksum = NULL;
1175f0ba89beSJeff Bonwick 	char *compress = NULL;
1176f0ba89beSJeff Bonwick 
1177f0ba89beSJeff Bonwick 	if (bp != NULL) {
1178f0ba89beSJeff Bonwick 		type = dmu_ot[BP_GET_TYPE(bp)].ot_name;
1179f0ba89beSJeff Bonwick 		checksum = zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name;
1180f0ba89beSJeff Bonwick 		compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name;
1181f0ba89beSJeff Bonwick 	}
1182fa9e4066Sahrens 
1183b24ab676SJeff Bonwick 	SPRINTF_BLKPTR(snprintf, ' ', buf, bp, type, checksum, compress);
1184fa9e4066Sahrens }
1185fa9e4066Sahrens 
1186fa9e4066Sahrens void
1187fa9e4066Sahrens spa_freeze(spa_t *spa)
1188fa9e4066Sahrens {
1189fa9e4066Sahrens 	uint64_t freeze_txg = 0;
1190fa9e4066Sahrens 
1191e14bb325SJeff Bonwick 	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1192fa9e4066Sahrens 	if (spa->spa_freeze_txg == UINT64_MAX) {
1193fa9e4066Sahrens 		freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE;
1194fa9e4066Sahrens 		spa->spa_freeze_txg = freeze_txg;
1195fa9e4066Sahrens 	}
1196e14bb325SJeff Bonwick 	spa_config_exit(spa, SCL_ALL, FTAG);
1197fa9e4066Sahrens 	if (freeze_txg != 0)
1198fa9e4066Sahrens 		txg_wait_synced(spa_get_dsl(spa), freeze_txg);
1199fa9e4066Sahrens }
1200fa9e4066Sahrens 
12010125049cSahrens void
12020125049cSahrens zfs_panic_recover(const char *fmt, ...)
12030125049cSahrens {
12040125049cSahrens 	va_list adx;
12050125049cSahrens 
12060125049cSahrens 	va_start(adx, fmt);
12070125049cSahrens 	vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
12080125049cSahrens 	va_end(adx);
12090125049cSahrens }
12100125049cSahrens 
1211*3f9d6ad7SLin Ling /*
1212*3f9d6ad7SLin Ling  * This is a stripped-down version of strtoull, suitable only for converting
1213*3f9d6ad7SLin Ling  * lowercase hexidecimal numbers that don't overflow.
1214*3f9d6ad7SLin Ling  */
1215*3f9d6ad7SLin Ling uint64_t
1216*3f9d6ad7SLin Ling strtonum(const char *str, char **nptr)
1217*3f9d6ad7SLin Ling {
1218*3f9d6ad7SLin Ling 	uint64_t val = 0;
1219*3f9d6ad7SLin Ling 	char c;
1220*3f9d6ad7SLin Ling 	int digit;
1221*3f9d6ad7SLin Ling 
1222*3f9d6ad7SLin Ling 	while ((c = *str) != '\0') {
1223*3f9d6ad7SLin Ling 		if (c >= '0' && c <= '9')
1224*3f9d6ad7SLin Ling 			digit = c - '0';
1225*3f9d6ad7SLin Ling 		else if (c >= 'a' && c <= 'f')
1226*3f9d6ad7SLin Ling 			digit = 10 + c - 'a';
1227*3f9d6ad7SLin Ling 		else
1228*3f9d6ad7SLin Ling 			break;
1229*3f9d6ad7SLin Ling 
1230*3f9d6ad7SLin Ling 		val *= 16;
1231*3f9d6ad7SLin Ling 		val += digit;
1232*3f9d6ad7SLin Ling 
1233*3f9d6ad7SLin Ling 		str++;
1234*3f9d6ad7SLin Ling 	}
1235*3f9d6ad7SLin Ling 
1236*3f9d6ad7SLin Ling 	if (nptr)
1237*3f9d6ad7SLin Ling 		*nptr = (char *)str;
1238*3f9d6ad7SLin Ling 
1239*3f9d6ad7SLin Ling 	return (val);
1240*3f9d6ad7SLin Ling }
1241*3f9d6ad7SLin Ling 
1242fa9e4066Sahrens /*
1243fa9e4066Sahrens  * ==========================================================================
1244fa9e4066Sahrens  * Accessor functions
1245fa9e4066Sahrens  * ==========================================================================
1246fa9e4066Sahrens  */
1247fa9e4066Sahrens 
1248088f3894Sahrens boolean_t
124988b7b0f2SMatthew Ahrens spa_shutting_down(spa_t *spa)
1250fa9e4066Sahrens {
125188b7b0f2SMatthew Ahrens 	return (spa->spa_async_suspended);
1252fa9e4066Sahrens }
1253fa9e4066Sahrens 
1254fa9e4066Sahrens dsl_pool_t *
1255fa9e4066Sahrens spa_get_dsl(spa_t *spa)
1256fa9e4066Sahrens {
1257fa9e4066Sahrens 	return (spa->spa_dsl_pool);
1258fa9e4066Sahrens }
1259fa9e4066Sahrens 
1260fa9e4066Sahrens blkptr_t *
1261fa9e4066Sahrens spa_get_rootblkptr(spa_t *spa)
1262fa9e4066Sahrens {
1263fa9e4066Sahrens 	return (&spa->spa_ubsync.ub_rootbp);
1264fa9e4066Sahrens }
1265fa9e4066Sahrens 
1266fa9e4066Sahrens void
1267fa9e4066Sahrens spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp)
1268fa9e4066Sahrens {
1269fa9e4066Sahrens 	spa->spa_uberblock.ub_rootbp = *bp;
1270fa9e4066Sahrens }
1271fa9e4066Sahrens 
1272fa9e4066Sahrens void
1273fa9e4066Sahrens spa_altroot(spa_t *spa, char *buf, size_t buflen)
1274fa9e4066Sahrens {
1275fa9e4066Sahrens 	if (spa->spa_root == NULL)
1276fa9e4066Sahrens 		buf[0] = '\0';
1277fa9e4066Sahrens 	else
1278fa9e4066Sahrens 		(void) strncpy(buf, spa->spa_root, buflen);
1279fa9e4066Sahrens }
1280fa9e4066Sahrens 
1281fa9e4066Sahrens int
1282fa9e4066Sahrens spa_sync_pass(spa_t *spa)
1283fa9e4066Sahrens {
1284fa9e4066Sahrens 	return (spa->spa_sync_pass);
1285fa9e4066Sahrens }
1286fa9e4066Sahrens 
1287fa9e4066Sahrens char *
1288fa9e4066Sahrens spa_name(spa_t *spa)
1289fa9e4066Sahrens {
1290fa9e4066Sahrens 	return (spa->spa_name);
1291fa9e4066Sahrens }
1292fa9e4066Sahrens 
1293fa9e4066Sahrens uint64_t
1294fa9e4066Sahrens spa_guid(spa_t *spa)
1295fa9e4066Sahrens {
1296b5989ec7Seschrock 	/*
1297b5989ec7Seschrock 	 * If we fail to parse the config during spa_load(), we can go through
1298b5989ec7Seschrock 	 * the error path (which posts an ereport) and end up here with no root
1299b5989ec7Seschrock 	 * vdev.  We stash the original pool guid in 'spa_load_guid' to handle
1300b5989ec7Seschrock 	 * this case.
1301b5989ec7Seschrock 	 */
1302b5989ec7Seschrock 	if (spa->spa_root_vdev != NULL)
1303b5989ec7Seschrock 		return (spa->spa_root_vdev->vdev_guid);
1304b5989ec7Seschrock 	else
1305b5989ec7Seschrock 		return (spa->spa_load_guid);
1306fa9e4066Sahrens }
1307fa9e4066Sahrens 
1308fa9e4066Sahrens uint64_t
1309fa9e4066Sahrens spa_last_synced_txg(spa_t *spa)
1310fa9e4066Sahrens {
1311fa9e4066Sahrens 	return (spa->spa_ubsync.ub_txg);
1312fa9e4066Sahrens }
1313fa9e4066Sahrens 
1314fa9e4066Sahrens uint64_t
1315fa9e4066Sahrens spa_first_txg(spa_t *spa)
1316fa9e4066Sahrens {
1317fa9e4066Sahrens 	return (spa->spa_first_txg);
1318fa9e4066Sahrens }
1319fa9e4066Sahrens 
1320b24ab676SJeff Bonwick uint64_t
1321b24ab676SJeff Bonwick spa_syncing_txg(spa_t *spa)
1322b24ab676SJeff Bonwick {
1323b24ab676SJeff Bonwick 	return (spa->spa_syncing_txg);
1324b24ab676SJeff Bonwick }
1325b24ab676SJeff Bonwick 
132688b7b0f2SMatthew Ahrens pool_state_t
1327fa9e4066Sahrens spa_state(spa_t *spa)
1328fa9e4066Sahrens {
1329fa9e4066Sahrens 	return (spa->spa_state);
1330fa9e4066Sahrens }
1331fa9e4066Sahrens 
1332b16da2e2SGeorge Wilson spa_load_state_t
1333b16da2e2SGeorge Wilson spa_load_state(spa_t *spa)
1334b16da2e2SGeorge Wilson {
1335b16da2e2SGeorge Wilson 	return (spa->spa_load_state);
1336b16da2e2SGeorge Wilson }
1337b16da2e2SGeorge Wilson 
1338fa9e4066Sahrens uint64_t
1339fa9e4066Sahrens spa_freeze_txg(spa_t *spa)
1340fa9e4066Sahrens {
1341fa9e4066Sahrens 	return (spa->spa_freeze_txg);
1342fa9e4066Sahrens }
1343fa9e4066Sahrens 
1344fa9e4066Sahrens /* ARGSUSED */
1345fa9e4066Sahrens uint64_t
1346fa9e4066Sahrens spa_get_asize(spa_t *spa, uint64_t lsize)
1347fa9e4066Sahrens {
1348fa9e4066Sahrens 	/*
1349b24ab676SJeff Bonwick 	 * The worst case is single-sector max-parity RAID-Z blocks, in which
1350b24ab676SJeff Bonwick 	 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
1351b24ab676SJeff Bonwick 	 * times the size; so just assume that.  Add to this the fact that
1352b24ab676SJeff Bonwick 	 * we can have up to 3 DVAs per bp, and one more factor of 2 because
1353b24ab676SJeff Bonwick 	 * the block may be dittoed with up to 3 DVAs by ddt_sync().
135444cd46caSbillm 	 */
1355b24ab676SJeff Bonwick 	return (lsize * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2);
135644cd46caSbillm }
135744cd46caSbillm 
1358485bbbf5SGeorge Wilson uint64_t
1359485bbbf5SGeorge Wilson spa_get_dspace(spa_t *spa)
1360485bbbf5SGeorge Wilson {
1361485bbbf5SGeorge Wilson 	return (spa->spa_dspace);
1362485bbbf5SGeorge Wilson }
1363485bbbf5SGeorge Wilson 
1364485bbbf5SGeorge Wilson void
1365485bbbf5SGeorge Wilson spa_update_dspace(spa_t *spa)
1366485bbbf5SGeorge Wilson {
1367485bbbf5SGeorge Wilson 	spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) +
1368485bbbf5SGeorge Wilson 	    ddt_get_dedup_dspace(spa);
1369485bbbf5SGeorge Wilson }
1370485bbbf5SGeorge Wilson 
13710a4e9518Sgw /*
13720a4e9518Sgw  * Return the failure mode that has been set to this pool. The default
13730a4e9518Sgw  * behavior will be to block all I/Os when a complete failure occurs.
13740a4e9518Sgw  */
13750a4e9518Sgw uint8_t
13760a4e9518Sgw spa_get_failmode(spa_t *spa)
13770a4e9518Sgw {
13780a4e9518Sgw 	return (spa->spa_failmode);
13790a4e9518Sgw }
13800a4e9518Sgw 
1381e14bb325SJeff Bonwick boolean_t
1382e14bb325SJeff Bonwick spa_suspended(spa_t *spa)
1383e14bb325SJeff Bonwick {
1384e14bb325SJeff Bonwick 	return (spa->spa_suspended);
1385e14bb325SJeff Bonwick }
1386e14bb325SJeff Bonwick 
138744cd46caSbillm uint64_t
138844cd46caSbillm spa_version(spa_t *spa)
138944cd46caSbillm {
139044cd46caSbillm 	return (spa->spa_ubsync.ub_version);
139144cd46caSbillm }
139244cd46caSbillm 
1393b24ab676SJeff Bonwick boolean_t
1394b24ab676SJeff Bonwick spa_deflate(spa_t *spa)
1395b24ab676SJeff Bonwick {
1396b24ab676SJeff Bonwick 	return (spa->spa_deflate);
1397b24ab676SJeff Bonwick }
1398b24ab676SJeff Bonwick 
1399b24ab676SJeff Bonwick metaslab_class_t *
1400b24ab676SJeff Bonwick spa_normal_class(spa_t *spa)
1401b24ab676SJeff Bonwick {
1402b24ab676SJeff Bonwick 	return (spa->spa_normal_class);
1403b24ab676SJeff Bonwick }
1404b24ab676SJeff Bonwick 
1405b24ab676SJeff Bonwick metaslab_class_t *
1406b24ab676SJeff Bonwick spa_log_class(spa_t *spa)
1407b24ab676SJeff Bonwick {
1408b24ab676SJeff Bonwick 	return (spa->spa_log_class);
1409b24ab676SJeff Bonwick }
1410b24ab676SJeff Bonwick 
141144cd46caSbillm int
141244cd46caSbillm spa_max_replication(spa_t *spa)
141344cd46caSbillm {
141444cd46caSbillm 	/*
1415e7437265Sahrens 	 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
141644cd46caSbillm 	 * handle BPs with more than one DVA allocated.  Set our max
141744cd46caSbillm 	 * replication level accordingly.
1418fa9e4066Sahrens 	 */
1419e7437265Sahrens 	if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS)
142044cd46caSbillm 		return (1);
142144cd46caSbillm 	return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override));
1422fa9e4066Sahrens }
1423fa9e4066Sahrens 
1424*3f9d6ad7SLin Ling int
1425*3f9d6ad7SLin Ling spa_prev_software_version(spa_t *spa)
1426*3f9d6ad7SLin Ling {
1427*3f9d6ad7SLin Ling 	return (spa->spa_prev_software_version);
1428*3f9d6ad7SLin Ling }
1429*3f9d6ad7SLin Ling 
143099653d4eSeschrock uint64_t
1431b24ab676SJeff Bonwick dva_get_dsize_sync(spa_t *spa, const dva_t *dva)
143299653d4eSeschrock {
1433b24ab676SJeff Bonwick 	uint64_t asize = DVA_GET_ASIZE(dva);
1434b24ab676SJeff Bonwick 	uint64_t dsize = asize;
143599653d4eSeschrock 
1436b24ab676SJeff Bonwick 	ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
143799653d4eSeschrock 
1438b24ab676SJeff Bonwick 	if (asize != 0 && spa->spa_deflate) {
1439b24ab676SJeff Bonwick 		vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));
1440b24ab676SJeff Bonwick 		dsize = (asize >> SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio;
144199653d4eSeschrock 	}
1442b24ab676SJeff Bonwick 
1443b24ab676SJeff Bonwick 	return (dsize);
1444b24ab676SJeff Bonwick }
1445b24ab676SJeff Bonwick 
1446b24ab676SJeff Bonwick uint64_t
1447b24ab676SJeff Bonwick bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp)
1448b24ab676SJeff Bonwick {
1449b24ab676SJeff Bonwick 	uint64_t dsize = 0;
1450b24ab676SJeff Bonwick 
1451b24ab676SJeff Bonwick 	for (int d = 0; d < SPA_DVAS_PER_BP; d++)
1452b24ab676SJeff Bonwick 		dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
1453b24ab676SJeff Bonwick 
1454b24ab676SJeff Bonwick 	return (dsize);
1455b24ab676SJeff Bonwick }
1456b24ab676SJeff Bonwick 
1457b24ab676SJeff Bonwick uint64_t
1458b24ab676SJeff Bonwick bp_get_dsize(spa_t *spa, const blkptr_t *bp)
1459b24ab676SJeff Bonwick {
1460b24ab676SJeff Bonwick 	uint64_t dsize = 0;
1461b24ab676SJeff Bonwick 
1462b24ab676SJeff Bonwick 	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
1463b24ab676SJeff Bonwick 
1464b24ab676SJeff Bonwick 	for (int d = 0; d < SPA_DVAS_PER_BP; d++)
1465b24ab676SJeff Bonwick 		dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
1466b24ab676SJeff Bonwick 
1467e14bb325SJeff Bonwick 	spa_config_exit(spa, SCL_VDEV, FTAG);
1468b24ab676SJeff Bonwick 
1469b24ab676SJeff Bonwick 	return (dsize);
147099653d4eSeschrock }
147199653d4eSeschrock 
1472fa9e4066Sahrens /*
1473fa9e4066Sahrens  * ==========================================================================
1474fa9e4066Sahrens  * Initialization and Termination
1475fa9e4066Sahrens  * ==========================================================================
1476fa9e4066Sahrens  */
1477fa9e4066Sahrens 
1478fa9e4066Sahrens static int
1479fa9e4066Sahrens spa_name_compare(const void *a1, const void *a2)
1480fa9e4066Sahrens {
1481fa9e4066Sahrens 	const spa_t *s1 = a1;
1482fa9e4066Sahrens 	const spa_t *s2 = a2;
1483fa9e4066Sahrens 	int s;
1484fa9e4066Sahrens 
1485fa9e4066Sahrens 	s = strcmp(s1->spa_name, s2->spa_name);
1486fa9e4066Sahrens 	if (s > 0)
1487fa9e4066Sahrens 		return (1);
1488fa9e4066Sahrens 	if (s < 0)
1489fa9e4066Sahrens 		return (-1);
1490fa9e4066Sahrens 	return (0);
1491fa9e4066Sahrens }
1492fa9e4066Sahrens 
14930373e76bSbonwick int
14940373e76bSbonwick spa_busy(void)
14950373e76bSbonwick {
14960373e76bSbonwick 	return (spa_active_count);
14970373e76bSbonwick }
14980373e76bSbonwick 
1499e7cbe64fSgw void
1500e7cbe64fSgw spa_boot_init()
1501e7cbe64fSgw {
1502e7cbe64fSgw 	spa_config_load();
1503e7cbe64fSgw }
1504e7cbe64fSgw 
1505fa9e4066Sahrens void
1506fa9e4066Sahrens spa_init(int mode)
1507fa9e4066Sahrens {
1508fa9e4066Sahrens 	mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL);
1509c25056deSgw 	mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL);
1510fa94a07fSbrendan 	mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL);
1511fa9e4066Sahrens 	cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL);
1512fa9e4066Sahrens 
1513fa9e4066Sahrens 	avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t),
1514fa9e4066Sahrens 	    offsetof(spa_t, spa_avl));
1515fa9e4066Sahrens 
1516fa94a07fSbrendan 	avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t),
1517fa94a07fSbrendan 	    offsetof(spa_aux_t, aux_avl));
1518fa94a07fSbrendan 
1519fa94a07fSbrendan 	avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t),
1520fa94a07fSbrendan 	    offsetof(spa_aux_t, aux_avl));
152199653d4eSeschrock 
15228ad4d6ddSJeff Bonwick 	spa_mode_global = mode;
1523fa9e4066Sahrens 
1524fa9e4066Sahrens 	refcount_init();
1525fa9e4066Sahrens 	unique_init();
1526fa9e4066Sahrens 	zio_init();
1527fa9e4066Sahrens 	dmu_init();
1528fa9e4066Sahrens 	zil_init();
152987db74c1Sek 	vdev_cache_stat_init();
153091ebeef5Sahrens 	zfs_prop_init();
1531990b4856Slling 	zpool_prop_init();
1532fa9e4066Sahrens 	spa_config_load();
1533e14bb325SJeff Bonwick 	l2arc_start();
1534fa9e4066Sahrens }
1535fa9e4066Sahrens 
1536fa9e4066Sahrens void
1537fa9e4066Sahrens spa_fini(void)
1538fa9e4066Sahrens {
1539e14bb325SJeff Bonwick 	l2arc_stop();
1540e14bb325SJeff Bonwick 
1541fa9e4066Sahrens 	spa_evict_all();
1542fa9e4066Sahrens 
154387db74c1Sek 	vdev_cache_stat_fini();
1544fa9e4066Sahrens 	zil_fini();
1545fa9e4066Sahrens 	dmu_fini();
1546fa9e4066Sahrens 	zio_fini();
154791ebeef5Sahrens 	unique_fini();
1548fa9e4066Sahrens 	refcount_fini();
1549fa9e4066Sahrens 
1550fa9e4066Sahrens 	avl_destroy(&spa_namespace_avl);
155199653d4eSeschrock 	avl_destroy(&spa_spare_avl);
1552fa94a07fSbrendan 	avl_destroy(&spa_l2cache_avl);
1553fa9e4066Sahrens 
1554fa9e4066Sahrens 	cv_destroy(&spa_namespace_cv);
1555fa9e4066Sahrens 	mutex_destroy(&spa_namespace_lock);
1556c25056deSgw 	mutex_destroy(&spa_spare_lock);
1557fa94a07fSbrendan 	mutex_destroy(&spa_l2cache_lock);
1558fa9e4066Sahrens }
15596ce0521aSperrin 
15606ce0521aSperrin /*
15616ce0521aSperrin  * Return whether this pool has slogs. No locking needed.
15626ce0521aSperrin  * It's not a problem if the wrong answer is returned as it's only for
15636ce0521aSperrin  * performance and not correctness
15646ce0521aSperrin  */
15656ce0521aSperrin boolean_t
15666ce0521aSperrin spa_has_slogs(spa_t *spa)
15676ce0521aSperrin {
15686ce0521aSperrin 	return (spa->spa_log_class->mc_rotor != NULL);
15696ce0521aSperrin }
1570bf82a41bSeschrock 
1571b24ab676SJeff Bonwick spa_log_state_t
1572b24ab676SJeff Bonwick spa_get_log_state(spa_t *spa)
1573b24ab676SJeff Bonwick {
1574b24ab676SJeff Bonwick 	return (spa->spa_log_state);
1575b24ab676SJeff Bonwick }
1576b24ab676SJeff Bonwick 
1577b24ab676SJeff Bonwick void
1578b24ab676SJeff Bonwick spa_set_log_state(spa_t *spa, spa_log_state_t state)
1579b24ab676SJeff Bonwick {
1580b24ab676SJeff Bonwick 	spa->spa_log_state = state;
1581b24ab676SJeff Bonwick }
1582b24ab676SJeff Bonwick 
1583bf82a41bSeschrock boolean_t
1584bf82a41bSeschrock spa_is_root(spa_t *spa)
1585bf82a41bSeschrock {
1586bf82a41bSeschrock 	return (spa->spa_is_root);
1587bf82a41bSeschrock }
15888ad4d6ddSJeff Bonwick 
15898ad4d6ddSJeff Bonwick boolean_t
15908ad4d6ddSJeff Bonwick spa_writeable(spa_t *spa)
15918ad4d6ddSJeff Bonwick {
15928ad4d6ddSJeff Bonwick 	return (!!(spa->spa_mode & FWRITE));
15938ad4d6ddSJeff Bonwick }
15948ad4d6ddSJeff Bonwick 
15958ad4d6ddSJeff Bonwick int
15968ad4d6ddSJeff Bonwick spa_mode(spa_t *spa)
15978ad4d6ddSJeff Bonwick {
15988ad4d6ddSJeff Bonwick 	return (spa->spa_mode);
15998ad4d6ddSJeff Bonwick }
1600b24ab676SJeff Bonwick 
1601b24ab676SJeff Bonwick uint64_t
1602b24ab676SJeff Bonwick spa_bootfs(spa_t *spa)
1603b24ab676SJeff Bonwick {
1604b24ab676SJeff Bonwick 	return (spa->spa_bootfs);
1605b24ab676SJeff Bonwick }
1606b24ab676SJeff Bonwick 
1607b24ab676SJeff Bonwick uint64_t
1608b24ab676SJeff Bonwick spa_delegation(spa_t *spa)
1609b24ab676SJeff Bonwick {
1610b24ab676SJeff Bonwick 	return (spa->spa_delegation);
1611b24ab676SJeff Bonwick }
1612b24ab676SJeff Bonwick 
1613b24ab676SJeff Bonwick objset_t *
1614b24ab676SJeff Bonwick spa_meta_objset(spa_t *spa)
1615b24ab676SJeff Bonwick {
1616b24ab676SJeff Bonwick 	return (spa->spa_meta_objset);
1617b24ab676SJeff Bonwick }
1618b24ab676SJeff Bonwick 
1619b24ab676SJeff Bonwick enum zio_checksum
1620b24ab676SJeff Bonwick spa_dedup_checksum(spa_t *spa)
1621b24ab676SJeff Bonwick {
1622b24ab676SJeff Bonwick 	return (spa->spa_dedup_checksum);
1623b24ab676SJeff Bonwick }
1624*3f9d6ad7SLin Ling 
1625*3f9d6ad7SLin Ling /*
1626*3f9d6ad7SLin Ling  * Reset pool scan stat per scan pass (or reboot).
1627*3f9d6ad7SLin Ling  */
1628*3f9d6ad7SLin Ling void
1629*3f9d6ad7SLin Ling spa_scan_stat_init(spa_t *spa)
1630*3f9d6ad7SLin Ling {
1631*3f9d6ad7SLin Ling 	/* data not stored on disk */
1632*3f9d6ad7SLin Ling 	spa->spa_scan_pass_start = gethrestime_sec();
1633*3f9d6ad7SLin Ling 	spa->spa_scan_pass_exam = 0;
1634*3f9d6ad7SLin Ling 	vdev_scan_stat_init(spa->spa_root_vdev);
1635*3f9d6ad7SLin Ling }
1636*3f9d6ad7SLin Ling 
1637*3f9d6ad7SLin Ling /*
1638*3f9d6ad7SLin Ling  * Get scan stats for zpool status reports
1639*3f9d6ad7SLin Ling  */
1640*3f9d6ad7SLin Ling int
1641*3f9d6ad7SLin Ling spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps)
1642*3f9d6ad7SLin Ling {
1643*3f9d6ad7SLin Ling 	dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL;
1644*3f9d6ad7SLin Ling 
1645*3f9d6ad7SLin Ling 	if (scn == NULL || scn->scn_phys.scn_func == POOL_SCAN_NONE)
1646*3f9d6ad7SLin Ling 		return (ENOENT);
1647*3f9d6ad7SLin Ling 	bzero(ps, sizeof (pool_scan_stat_t));
1648*3f9d6ad7SLin Ling 
1649*3f9d6ad7SLin Ling 	/* data stored on disk */
1650*3f9d6ad7SLin Ling 	ps->pss_func = scn->scn_phys.scn_func;
1651*3f9d6ad7SLin Ling 	ps->pss_start_time = scn->scn_phys.scn_start_time;
1652*3f9d6ad7SLin Ling 	ps->pss_end_time = scn->scn_phys.scn_end_time;
1653*3f9d6ad7SLin Ling 	ps->pss_to_examine = scn->scn_phys.scn_to_examine;
1654*3f9d6ad7SLin Ling 	ps->pss_examined = scn->scn_phys.scn_examined;
1655*3f9d6ad7SLin Ling 	ps->pss_to_process = scn->scn_phys.scn_to_process;
1656*3f9d6ad7SLin Ling 	ps->pss_processed = scn->scn_phys.scn_processed;
1657*3f9d6ad7SLin Ling 	ps->pss_errors = scn->scn_phys.scn_errors;
1658*3f9d6ad7SLin Ling 	ps->pss_state = scn->scn_phys.scn_state;
1659*3f9d6ad7SLin Ling 
1660*3f9d6ad7SLin Ling 	/* data not stored on disk */
1661*3f9d6ad7SLin Ling 	ps->pss_pass_start = spa->spa_scan_pass_start;
1662*3f9d6ad7SLin Ling 	ps->pss_pass_exam = spa->spa_scan_pass_exam;
1663*3f9d6ad7SLin Ling 
1664*3f9d6ad7SLin Ling 	return (0);
1665*3f9d6ad7SLin Ling }
1666