1 /*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <sys/zfs_context.h>
27 #include <sys/spa_impl.h>
28 #include <sys/zio.h>
29 #include <sys/zio_checksum.h>
30 #include <sys/zio_compress.h>
31 #include <sys/dmu.h>
32 #include <sys/dmu_tx.h>
33 #include <sys/zap.h>
34 #include <sys/zil.h>
35 #include <sys/vdev_impl.h>
36 #include <sys/metaslab.h>
37 #include <sys/uberblock_impl.h>
38 #include <sys/txg.h>
39 #include <sys/avl.h>
40 #include <sys/unique.h>
41 #include <sys/dsl_pool.h>
42 #include <sys/dsl_dir.h>
43 #include <sys/dsl_prop.h>
44 #include <sys/fs/zfs.h>
45 #include <sys/metaslab_impl.h>
46 #include <sys/arc.h>
47 #include <sys/ddt.h>
48 #include "zfs_prop.h"
49
50 /*
51 * SPA locking
52 *
53 * There are four basic locks for managing spa_t structures:
54 *
55 * spa_namespace_lock (global mutex)
56 *
57 * This lock must be acquired to do any of the following:
58 *
59 * - Lookup a spa_t by name
60 * - Add or remove a spa_t from the namespace
61 * - Increase spa_refcount from non-zero
62 * - Check if spa_refcount is zero
63 * - Rename a spa_t
64 * - add/remove/attach/detach devices
65 * - Held for the duration of create/destroy/import/export
66 *
67 * It does not need to handle recursion. A create or destroy may
68 * reference objects (files or zvols) in other pools, but by
69 * definition they must have an existing reference, and will never need
70 * to lookup a spa_t by name.
71 *
72 * spa_refcount (per-spa refcount_t protected by mutex)
73 *
74 * This reference count keep track of any active users of the spa_t. The
75 * spa_t cannot be destroyed or freed while this is non-zero. Internally,
76 * the refcount is never really 'zero' - opening a pool implicitly keeps
77 * some references in the DMU. Internally we check against spa_minref, but
78 * present the image of a zero/non-zero value to consumers.
79 *
80 * spa_config_lock[] (per-spa array of rwlocks)
81 *
82 * This protects the spa_t from config changes, and must be held in
83 * the following circumstances:
84 *
85 * - RW_READER to perform I/O to the spa
86 * - RW_WRITER to change the vdev config
87 *
88 * The locking order is fairly straightforward:
89 *
90 * spa_namespace_lock -> spa_refcount
91 *
92 * The namespace lock must be acquired to increase the refcount from 0
93 * or to check if it is zero.
94 *
95 * spa_refcount -> spa_config_lock[]
96 *
97 * There must be at least one valid reference on the spa_t to acquire
98 * the config lock.
99 *
100 * spa_namespace_lock -> spa_config_lock[]
101 *
102 * The namespace lock must always be taken before the config lock.
103 *
104 *
105 * The spa_namespace_lock can be acquired directly and is globally visible.
106 *
107 * The namespace is manipulated using the following functions, all of which
108 * require the spa_namespace_lock to be held.
109 *
110 * spa_lookup() Lookup a spa_t by name.
111 *
112 * spa_add() Create a new spa_t in the namespace.
113 *
114 * spa_remove() Remove a spa_t from the namespace. This also
115 * frees up any memory associated with the spa_t.
116 *
117 * spa_next() Returns the next spa_t in the system, or the
118 * first if NULL is passed.
119 *
120 * spa_evict_all() Shutdown and remove all spa_t structures in
121 * the system.
122 *
123 * spa_guid_exists() Determine whether a pool/device guid exists.
124 *
125 * The spa_refcount is manipulated using the following functions:
126 *
127 * spa_open_ref() Adds a reference to the given spa_t. Must be
128 * called with spa_namespace_lock held if the
129 * refcount is currently zero.
130 *
131 * spa_close() Remove a reference from the spa_t. This will
132 * not free the spa_t or remove it from the
133 * namespace. No locking is required.
134 *
135 * spa_refcount_zero() Returns true if the refcount is currently
136 * zero. Must be called with spa_namespace_lock
137 * held.
138 *
139 * The spa_config_lock[] is an array of rwlocks, ordered as follows:
140 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
141 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
142 *
143 * To read the configuration, it suffices to hold one of these locks as reader.
144 * To modify the configuration, you must hold all locks as writer. To modify
145 * vdev state without altering the vdev tree's topology (e.g. online/offline),
146 * you must hold SCL_STATE and SCL_ZIO as writer.
147 *
148 * We use these distinct config locks to avoid recursive lock entry.
149 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
150 * block allocations (SCL_ALLOC), which may require reading space maps
151 * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
152 *
153 * The spa config locks cannot be normal rwlocks because we need the
154 * ability to hand off ownership. For example, SCL_ZIO is acquired
155 * by the issuing thread and later released by an interrupt thread.
156 * They do, however, obey the usual write-wanted semantics to prevent
157 * writer (i.e. system administrator) starvation.
158 *
159 * The lock acquisition rules are as follows:
160 *
161 * SCL_CONFIG
162 * Protects changes to the vdev tree topology, such as vdev
163 * add/remove/attach/detach. Protects the dirty config list
164 * (spa_config_dirty_list) and the set of spares and l2arc devices.
165 *
166 * SCL_STATE
167 * Protects changes to pool state and vdev state, such as vdev
168 * online/offline/fault/degrade/clear. Protects the dirty state list
169 * (spa_state_dirty_list) and global pool state (spa_state).
170 *
171 * SCL_ALLOC
172 * Protects changes to metaslab groups and classes.
173 * Held as reader by metaslab_alloc() and metaslab_claim().
174 *
175 * SCL_ZIO
176 * Held by bp-level zios (those which have no io_vd upon entry)
177 * to prevent changes to the vdev tree. The bp-level zio implicitly
178 * protects all of its vdev child zios, which do not hold SCL_ZIO.
179 *
180 * SCL_FREE
181 * Protects changes to metaslab groups and classes.
182 * Held as reader by metaslab_free(). SCL_FREE is distinct from
183 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
184 * blocks in zio_done() while another i/o that holds either
185 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
186 *
187 * SCL_VDEV
188 * Held as reader to prevent changes to the vdev tree during trivial
189 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
190 * other locks, and lower than all of them, to ensure that it's safe
191 * to acquire regardless of caller context.
192 *
193 * In addition, the following rules apply:
194 *
195 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
196 * The lock ordering is SCL_CONFIG > spa_props_lock.
197 *
198 * (b) I/O operations on leaf vdevs. For any zio operation that takes
199 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
200 * or zio_write_phys() -- the caller must ensure that the config cannot
201 * cannot change in the interim, and that the vdev cannot be reopened.
202 * SCL_STATE as reader suffices for both.
203 *
204 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
205 *
206 * spa_vdev_enter() Acquire the namespace lock and the config lock
207 * for writing.
208 *
209 * spa_vdev_exit() Release the config lock, wait for all I/O
210 * to complete, sync the updated configs to the
211 * cache, and release the namespace lock.
212 *
213 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
214 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
215 * locking is, always, based on spa_namespace_lock and spa_config_lock[].
216 *
217 * spa_rename() is also implemented within this file since is requires
218 * manipulation of the namespace.
219 */
220
221 static avl_tree_t spa_namespace_avl;
222 kmutex_t spa_namespace_lock;
223 static kcondvar_t spa_namespace_cv;
224 static int spa_active_count;
225 int spa_max_replication_override = SPA_DVAS_PER_BP;
226
227 static kmutex_t spa_spare_lock;
228 static avl_tree_t spa_spare_avl;
229 static kmutex_t spa_l2cache_lock;
230 static avl_tree_t spa_l2cache_avl;
231
232 kmem_cache_t *spa_buffer_pool;
233 int spa_mode_global;
234
235 #ifdef ZFS_DEBUG
236 /* Everything except dprintf is on by default in debug builds */
237 int zfs_flags = ~ZFS_DEBUG_DPRINTF;
238 #else
239 int zfs_flags = 0;
240 #endif
241
242 /*
243 * zfs_recover can be set to nonzero to attempt to recover from
244 * otherwise-fatal errors, typically caused by on-disk corruption. When
245 * set, calls to zfs_panic_recover() will turn into warning messages.
246 */
247 int zfs_recover = 0;
248
249
250 /*
251 * ==========================================================================
252 * SPA config locking
253 * ==========================================================================
254 */
255 static void
spa_config_lock_init(spa_t * spa)256 spa_config_lock_init(spa_t *spa)
257 {
258 for (int i = 0; i < SCL_LOCKS; i++) {
259 spa_config_lock_t *scl = &spa->spa_config_lock[i];
260 mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL);
261 cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL);
262 refcount_create(&scl->scl_count);
263 scl->scl_writer = NULL;
264 scl->scl_write_wanted = 0;
265 }
266 }
267
268 static void
spa_config_lock_destroy(spa_t * spa)269 spa_config_lock_destroy(spa_t *spa)
270 {
271 for (int i = 0; i < SCL_LOCKS; i++) {
272 spa_config_lock_t *scl = &spa->spa_config_lock[i];
273 mutex_destroy(&scl->scl_lock);
274 cv_destroy(&scl->scl_cv);
275 refcount_destroy(&scl->scl_count);
276 ASSERT(scl->scl_writer == NULL);
277 ASSERT(scl->scl_write_wanted == 0);
278 }
279 }
280
281 int
spa_config_tryenter(spa_t * spa,int locks,void * tag,krw_t rw)282 spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw)
283 {
284 for (int i = 0; i < SCL_LOCKS; i++) {
285 spa_config_lock_t *scl = &spa->spa_config_lock[i];
286 if (!(locks & (1 << i)))
287 continue;
288 mutex_enter(&scl->scl_lock);
289 if (rw == RW_READER) {
290 if (scl->scl_writer || scl->scl_write_wanted) {
291 mutex_exit(&scl->scl_lock);
292 spa_config_exit(spa, locks ^ (1 << i), tag);
293 return (0);
294 }
295 } else {
296 ASSERT(scl->scl_writer != curthread);
297 if (!refcount_is_zero(&scl->scl_count)) {
298 mutex_exit(&scl->scl_lock);
299 spa_config_exit(spa, locks ^ (1 << i), tag);
300 return (0);
301 }
302 scl->scl_writer = curthread;
303 }
304 (void) refcount_add(&scl->scl_count, tag);
305 mutex_exit(&scl->scl_lock);
306 }
307 return (1);
308 }
309
310 void
spa_config_enter(spa_t * spa,int locks,void * tag,krw_t rw)311 spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw)
312 {
313 int wlocks_held = 0;
314
315 for (int i = 0; i < SCL_LOCKS; i++) {
316 spa_config_lock_t *scl = &spa->spa_config_lock[i];
317 if (scl->scl_writer == curthread)
318 wlocks_held |= (1 << i);
319 if (!(locks & (1 << i)))
320 continue;
321 mutex_enter(&scl->scl_lock);
322 if (rw == RW_READER) {
323 while (scl->scl_writer || scl->scl_write_wanted) {
324 cv_wait(&scl->scl_cv, &scl->scl_lock);
325 }
326 } else {
327 ASSERT(scl->scl_writer != curthread);
328 while (!refcount_is_zero(&scl->scl_count)) {
329 scl->scl_write_wanted++;
330 cv_wait(&scl->scl_cv, &scl->scl_lock);
331 scl->scl_write_wanted--;
332 }
333 scl->scl_writer = curthread;
334 }
335 (void) refcount_add(&scl->scl_count, tag);
336 mutex_exit(&scl->scl_lock);
337 }
338 ASSERT(wlocks_held <= locks);
339 }
340
341 void
spa_config_exit(spa_t * spa,int locks,void * tag)342 spa_config_exit(spa_t *spa, int locks, void *tag)
343 {
344 for (int i = SCL_LOCKS - 1; i >= 0; i--) {
345 spa_config_lock_t *scl = &spa->spa_config_lock[i];
346 if (!(locks & (1 << i)))
347 continue;
348 mutex_enter(&scl->scl_lock);
349 ASSERT(!refcount_is_zero(&scl->scl_count));
350 if (refcount_remove(&scl->scl_count, tag) == 0) {
351 ASSERT(scl->scl_writer == NULL ||
352 scl->scl_writer == curthread);
353 scl->scl_writer = NULL; /* OK in either case */
354 cv_broadcast(&scl->scl_cv);
355 }
356 mutex_exit(&scl->scl_lock);
357 }
358 }
359
360 int
spa_config_held(spa_t * spa,int locks,krw_t rw)361 spa_config_held(spa_t *spa, int locks, krw_t rw)
362 {
363 int locks_held = 0;
364
365 for (int i = 0; i < SCL_LOCKS; i++) {
366 spa_config_lock_t *scl = &spa->spa_config_lock[i];
367 if (!(locks & (1 << i)))
368 continue;
369 if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) ||
370 (rw == RW_WRITER && scl->scl_writer == curthread))
371 locks_held |= 1 << i;
372 }
373
374 return (locks_held);
375 }
376
377 /*
378 * ==========================================================================
379 * SPA namespace functions
380 * ==========================================================================
381 */
382
383 /*
384 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
385 * Returns NULL if no matching spa_t is found.
386 */
387 spa_t *
spa_lookup(const char * name)388 spa_lookup(const char *name)
389 {
390 static spa_t search; /* spa_t is large; don't allocate on stack */
391 spa_t *spa;
392 avl_index_t where;
393 char c;
394 char *cp;
395
396 ASSERT(MUTEX_HELD(&spa_namespace_lock));
397
398 /*
399 * If it's a full dataset name, figure out the pool name and
400 * just use that.
401 */
402 cp = strpbrk(name, "/@");
403 if (cp) {
404 c = *cp;
405 *cp = '\0';
406 }
407
408 (void) strlcpy(search.spa_name, name, sizeof (search.spa_name));
409 spa = avl_find(&spa_namespace_avl, &search, &where);
410
411 if (cp)
412 *cp = c;
413
414 return (spa);
415 }
416
417 /*
418 * Create an uninitialized spa_t with the given name. Requires
419 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
420 * exist by calling spa_lookup() first.
421 */
422 spa_t *
spa_add(const char * name,nvlist_t * config,const char * altroot)423 spa_add(const char *name, nvlist_t *config, const char *altroot)
424 {
425 spa_t *spa;
426 spa_config_dirent_t *dp;
427
428 ASSERT(MUTEX_HELD(&spa_namespace_lock));
429
430 spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP);
431
432 mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
433 mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
434 mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL);
435 mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL);
436 mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL);
437 mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL);
438 mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL);
439 mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL);
440 mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL);
441
442 cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL);
443 cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL);
444 cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL);
445 cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL);
446
447 for (int t = 0; t < TXG_SIZE; t++)
448 bplist_init(&spa->spa_free_bplist[t]);
449 bplist_init(&spa->spa_deferred_bplist);
450
451 (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name));
452 spa->spa_state = POOL_STATE_UNINITIALIZED;
453 spa->spa_freeze_txg = UINT64_MAX;
454 spa->spa_final_txg = UINT64_MAX;
455 spa->spa_load_max_txg = UINT64_MAX;
456 spa->spa_proc = &p0;
457 spa->spa_proc_state = SPA_PROC_NONE;
458
459 refcount_create(&spa->spa_refcount);
460 spa_config_lock_init(spa);
461
462 avl_add(&spa_namespace_avl, spa);
463
464 /*
465 * Set the alternate root, if there is one.
466 */
467 if (altroot) {
468 spa->spa_root = spa_strdup(altroot);
469 spa_active_count++;
470 }
471
472 /*
473 * Every pool starts with the default cachefile
474 */
475 list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t),
476 offsetof(spa_config_dirent_t, scd_link));
477
478 dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP);
479 dp->scd_path = spa_strdup(spa_config_path);
480 list_insert_head(&spa->spa_config_list, dp);
481
482 if (config != NULL)
483 VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0);
484
485 return (spa);
486 }
487
488 /*
489 * Removes a spa_t from the namespace, freeing up any memory used. Requires
490 * spa_namespace_lock. This is called only after the spa_t has been closed and
491 * deactivated.
492 */
493 void
spa_remove(spa_t * spa)494 spa_remove(spa_t *spa)
495 {
496 spa_config_dirent_t *dp;
497
498 ASSERT(MUTEX_HELD(&spa_namespace_lock));
499 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
500
501 nvlist_free(spa->spa_config_splitting);
502
503 avl_remove(&spa_namespace_avl, spa);
504 cv_broadcast(&spa_namespace_cv);
505
506 if (spa->spa_root) {
507 spa_strfree(spa->spa_root);
508 spa_active_count--;
509 }
510
511 while ((dp = list_head(&spa->spa_config_list)) != NULL) {
512 list_remove(&spa->spa_config_list, dp);
513 if (dp->scd_path != NULL)
514 spa_strfree(dp->scd_path);
515 kmem_free(dp, sizeof (spa_config_dirent_t));
516 }
517
518 list_destroy(&spa->spa_config_list);
519
520 spa_config_set(spa, NULL);
521
522 refcount_destroy(&spa->spa_refcount);
523
524 spa_config_lock_destroy(spa);
525
526 for (int t = 0; t < TXG_SIZE; t++)
527 bplist_fini(&spa->spa_free_bplist[t]);
528 bplist_fini(&spa->spa_deferred_bplist);
529
530 cv_destroy(&spa->spa_async_cv);
531 cv_destroy(&spa->spa_proc_cv);
532 cv_destroy(&spa->spa_scrub_io_cv);
533 cv_destroy(&spa->spa_suspend_cv);
534
535 mutex_destroy(&spa->spa_async_lock);
536 mutex_destroy(&spa->spa_errlist_lock);
537 mutex_destroy(&spa->spa_errlog_lock);
538 mutex_destroy(&spa->spa_history_lock);
539 mutex_destroy(&spa->spa_proc_lock);
540 mutex_destroy(&spa->spa_props_lock);
541 mutex_destroy(&spa->spa_scrub_lock);
542 mutex_destroy(&spa->spa_suspend_lock);
543 mutex_destroy(&spa->spa_vdev_top_lock);
544
545 kmem_free(spa, sizeof (spa_t));
546 }
547
548 /*
549 * Given a pool, return the next pool in the namespace, or NULL if there is
550 * none. If 'prev' is NULL, return the first pool.
551 */
552 spa_t *
spa_next(spa_t * prev)553 spa_next(spa_t *prev)
554 {
555 ASSERT(MUTEX_HELD(&spa_namespace_lock));
556
557 if (prev)
558 return (AVL_NEXT(&spa_namespace_avl, prev));
559 else
560 return (avl_first(&spa_namespace_avl));
561 }
562
563 /*
564 * ==========================================================================
565 * SPA refcount functions
566 * ==========================================================================
567 */
568
569 /*
570 * Add a reference to the given spa_t. Must have at least one reference, or
571 * have the namespace lock held.
572 */
573 void
spa_open_ref(spa_t * spa,void * tag)574 spa_open_ref(spa_t *spa, void *tag)
575 {
576 ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref ||
577 MUTEX_HELD(&spa_namespace_lock));
578 (void) refcount_add(&spa->spa_refcount, tag);
579 }
580
581 /*
582 * Remove a reference to the given spa_t. Must have at least one reference, or
583 * have the namespace lock held.
584 */
585 void
spa_close(spa_t * spa,void * tag)586 spa_close(spa_t *spa, void *tag)
587 {
588 ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref ||
589 MUTEX_HELD(&spa_namespace_lock));
590 (void) refcount_remove(&spa->spa_refcount, tag);
591 }
592
593 /*
594 * Check to see if the spa refcount is zero. Must be called with
595 * spa_namespace_lock held. We really compare against spa_minref, which is the
596 * number of references acquired when opening a pool
597 */
598 boolean_t
spa_refcount_zero(spa_t * spa)599 spa_refcount_zero(spa_t *spa)
600 {
601 ASSERT(MUTEX_HELD(&spa_namespace_lock));
602
603 return (refcount_count(&spa->spa_refcount) == spa->spa_minref);
604 }
605
606 /*
607 * ==========================================================================
608 * SPA spare and l2cache tracking
609 * ==========================================================================
610 */
611
612 /*
613 * Hot spares and cache devices are tracked using the same code below,
614 * for 'auxiliary' devices.
615 */
616
617 typedef struct spa_aux {
618 uint64_t aux_guid;
619 uint64_t aux_pool;
620 avl_node_t aux_avl;
621 int aux_count;
622 } spa_aux_t;
623
624 static int
spa_aux_compare(const void * a,const void * b)625 spa_aux_compare(const void *a, const void *b)
626 {
627 const spa_aux_t *sa = a;
628 const spa_aux_t *sb = b;
629
630 if (sa->aux_guid < sb->aux_guid)
631 return (-1);
632 else if (sa->aux_guid > sb->aux_guid)
633 return (1);
634 else
635 return (0);
636 }
637
638 void
spa_aux_add(vdev_t * vd,avl_tree_t * avl)639 spa_aux_add(vdev_t *vd, avl_tree_t *avl)
640 {
641 avl_index_t where;
642 spa_aux_t search;
643 spa_aux_t *aux;
644
645 search.aux_guid = vd->vdev_guid;
646 if ((aux = avl_find(avl, &search, &where)) != NULL) {
647 aux->aux_count++;
648 } else {
649 aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP);
650 aux->aux_guid = vd->vdev_guid;
651 aux->aux_count = 1;
652 avl_insert(avl, aux, where);
653 }
654 }
655
656 void
spa_aux_remove(vdev_t * vd,avl_tree_t * avl)657 spa_aux_remove(vdev_t *vd, avl_tree_t *avl)
658 {
659 spa_aux_t search;
660 spa_aux_t *aux;
661 avl_index_t where;
662
663 search.aux_guid = vd->vdev_guid;
664 aux = avl_find(avl, &search, &where);
665
666 ASSERT(aux != NULL);
667
668 if (--aux->aux_count == 0) {
669 avl_remove(avl, aux);
670 kmem_free(aux, sizeof (spa_aux_t));
671 } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) {
672 aux->aux_pool = 0ULL;
673 }
674 }
675
676 boolean_t
spa_aux_exists(uint64_t guid,uint64_t * pool,int * refcnt,avl_tree_t * avl)677 spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl)
678 {
679 spa_aux_t search, *found;
680
681 search.aux_guid = guid;
682 found = avl_find(avl, &search, NULL);
683
684 if (pool) {
685 if (found)
686 *pool = found->aux_pool;
687 else
688 *pool = 0ULL;
689 }
690
691 if (refcnt) {
692 if (found)
693 *refcnt = found->aux_count;
694 else
695 *refcnt = 0;
696 }
697
698 return (found != NULL);
699 }
700
701 void
spa_aux_activate(vdev_t * vd,avl_tree_t * avl)702 spa_aux_activate(vdev_t *vd, avl_tree_t *avl)
703 {
704 spa_aux_t search, *found;
705 avl_index_t where;
706
707 search.aux_guid = vd->vdev_guid;
708 found = avl_find(avl, &search, &where);
709 ASSERT(found != NULL);
710 ASSERT(found->aux_pool == 0ULL);
711
712 found->aux_pool = spa_guid(vd->vdev_spa);
713 }
714
715 /*
716 * Spares are tracked globally due to the following constraints:
717 *
718 * - A spare may be part of multiple pools.
719 * - A spare may be added to a pool even if it's actively in use within
720 * another pool.
721 * - A spare in use in any pool can only be the source of a replacement if
722 * the target is a spare in the same pool.
723 *
724 * We keep track of all spares on the system through the use of a reference
725 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
726 * spare, then we bump the reference count in the AVL tree. In addition, we set
727 * the 'vdev_isspare' member to indicate that the device is a spare (active or
728 * inactive). When a spare is made active (used to replace a device in the
729 * pool), we also keep track of which pool its been made a part of.
730 *
731 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
732 * called under the spa_namespace lock as part of vdev reconfiguration. The
733 * separate spare lock exists for the status query path, which does not need to
734 * be completely consistent with respect to other vdev configuration changes.
735 */
736
737 static int
spa_spare_compare(const void * a,const void * b)738 spa_spare_compare(const void *a, const void *b)
739 {
740 return (spa_aux_compare(a, b));
741 }
742
743 void
spa_spare_add(vdev_t * vd)744 spa_spare_add(vdev_t *vd)
745 {
746 mutex_enter(&spa_spare_lock);
747 ASSERT(!vd->vdev_isspare);
748 spa_aux_add(vd, &spa_spare_avl);
749 vd->vdev_isspare = B_TRUE;
750 mutex_exit(&spa_spare_lock);
751 }
752
753 void
spa_spare_remove(vdev_t * vd)754 spa_spare_remove(vdev_t *vd)
755 {
756 mutex_enter(&spa_spare_lock);
757 ASSERT(vd->vdev_isspare);
758 spa_aux_remove(vd, &spa_spare_avl);
759 vd->vdev_isspare = B_FALSE;
760 mutex_exit(&spa_spare_lock);
761 }
762
763 boolean_t
spa_spare_exists(uint64_t guid,uint64_t * pool,int * refcnt)764 spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt)
765 {
766 boolean_t found;
767
768 mutex_enter(&spa_spare_lock);
769 found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl);
770 mutex_exit(&spa_spare_lock);
771
772 return (found);
773 }
774
775 void
spa_spare_activate(vdev_t * vd)776 spa_spare_activate(vdev_t *vd)
777 {
778 mutex_enter(&spa_spare_lock);
779 ASSERT(vd->vdev_isspare);
780 spa_aux_activate(vd, &spa_spare_avl);
781 mutex_exit(&spa_spare_lock);
782 }
783
784 /*
785 * Level 2 ARC devices are tracked globally for the same reasons as spares.
786 * Cache devices currently only support one pool per cache device, and so
787 * for these devices the aux reference count is currently unused beyond 1.
788 */
789
790 static int
spa_l2cache_compare(const void * a,const void * b)791 spa_l2cache_compare(const void *a, const void *b)
792 {
793 return (spa_aux_compare(a, b));
794 }
795
796 void
spa_l2cache_add(vdev_t * vd)797 spa_l2cache_add(vdev_t *vd)
798 {
799 mutex_enter(&spa_l2cache_lock);
800 ASSERT(!vd->vdev_isl2cache);
801 spa_aux_add(vd, &spa_l2cache_avl);
802 vd->vdev_isl2cache = B_TRUE;
803 mutex_exit(&spa_l2cache_lock);
804 }
805
806 void
spa_l2cache_remove(vdev_t * vd)807 spa_l2cache_remove(vdev_t *vd)
808 {
809 mutex_enter(&spa_l2cache_lock);
810 ASSERT(vd->vdev_isl2cache);
811 spa_aux_remove(vd, &spa_l2cache_avl);
812 vd->vdev_isl2cache = B_FALSE;
813 mutex_exit(&spa_l2cache_lock);
814 }
815
816 boolean_t
spa_l2cache_exists(uint64_t guid,uint64_t * pool)817 spa_l2cache_exists(uint64_t guid, uint64_t *pool)
818 {
819 boolean_t found;
820
821 mutex_enter(&spa_l2cache_lock);
822 found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl);
823 mutex_exit(&spa_l2cache_lock);
824
825 return (found);
826 }
827
828 void
spa_l2cache_activate(vdev_t * vd)829 spa_l2cache_activate(vdev_t *vd)
830 {
831 mutex_enter(&spa_l2cache_lock);
832 ASSERT(vd->vdev_isl2cache);
833 spa_aux_activate(vd, &spa_l2cache_avl);
834 mutex_exit(&spa_l2cache_lock);
835 }
836
837 /*
838 * ==========================================================================
839 * SPA vdev locking
840 * ==========================================================================
841 */
842
843 /*
844 * Lock the given spa_t for the purpose of adding or removing a vdev.
845 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
846 * It returns the next transaction group for the spa_t.
847 */
848 uint64_t
spa_vdev_enter(spa_t * spa)849 spa_vdev_enter(spa_t *spa)
850 {
851 mutex_enter(&spa->spa_vdev_top_lock);
852 mutex_enter(&spa_namespace_lock);
853 return (spa_vdev_config_enter(spa));
854 }
855
856 /*
857 * Internal implementation for spa_vdev_enter(). Used when a vdev
858 * operation requires multiple syncs (i.e. removing a device) while
859 * keeping the spa_namespace_lock held.
860 */
861 uint64_t
spa_vdev_config_enter(spa_t * spa)862 spa_vdev_config_enter(spa_t *spa)
863 {
864 ASSERT(MUTEX_HELD(&spa_namespace_lock));
865
866 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
867
868 return (spa_last_synced_txg(spa) + 1);
869 }
870
871 /*
872 * Used in combination with spa_vdev_config_enter() to allow the syncing
873 * of multiple transactions without releasing the spa_namespace_lock.
874 */
875 void
spa_vdev_config_exit(spa_t * spa,vdev_t * vd,uint64_t txg,int error,char * tag)876 spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag)
877 {
878 ASSERT(MUTEX_HELD(&spa_namespace_lock));
879
880 int config_changed = B_FALSE;
881
882 ASSERT(txg > spa_last_synced_txg(spa));
883
884 spa->spa_pending_vdev = NULL;
885
886 /*
887 * Reassess the DTLs.
888 */
889 vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE);
890
891 /*
892 * If the config changed, notify the scrub thread that it must restart.
893 */
894 if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) {
895 dsl_pool_scrub_restart(spa->spa_dsl_pool);
896 config_changed = B_TRUE;
897 spa->spa_config_generation++;
898 }
899
900 /*
901 * Verify the metaslab classes.
902 */
903 ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0);
904 ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0);
905
906 spa_config_exit(spa, SCL_ALL, spa);
907
908 /*
909 * Panic the system if the specified tag requires it. This
910 * is useful for ensuring that configurations are updated
911 * transactionally.
912 */
913 if (zio_injection_enabled)
914 zio_handle_panic_injection(spa, tag, 0);
915
916 /*
917 * Note: this txg_wait_synced() is important because it ensures
918 * that there won't be more than one config change per txg.
919 * This allows us to use the txg as the generation number.
920 */
921 if (error == 0)
922 txg_wait_synced(spa->spa_dsl_pool, txg);
923
924 if (vd != NULL) {
925 ASSERT(!vd->vdev_detached || vd->vdev_dtl_smo.smo_object == 0);
926 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
927 vdev_free(vd);
928 spa_config_exit(spa, SCL_ALL, spa);
929 }
930
931 /*
932 * If the config changed, update the config cache.
933 */
934 if (config_changed)
935 spa_config_sync(spa, B_FALSE, B_TRUE);
936 }
937
938 /*
939 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
940 * locking of spa_vdev_enter(), we also want make sure the transactions have
941 * synced to disk, and then update the global configuration cache with the new
942 * information.
943 */
944 int
spa_vdev_exit(spa_t * spa,vdev_t * vd,uint64_t txg,int error)945 spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error)
946 {
947 spa_vdev_config_exit(spa, vd, txg, error, FTAG);
948 mutex_exit(&spa_namespace_lock);
949 mutex_exit(&spa->spa_vdev_top_lock);
950
951 return (error);
952 }
953
954 /*
955 * Lock the given spa_t for the purpose of changing vdev state.
956 */
957 void
spa_vdev_state_enter(spa_t * spa,int oplocks)958 spa_vdev_state_enter(spa_t *spa, int oplocks)
959 {
960 int locks = SCL_STATE_ALL | oplocks;
961
962 spa_config_enter(spa, locks, spa, RW_WRITER);
963 spa->spa_vdev_locks = locks;
964 }
965
966 int
spa_vdev_state_exit(spa_t * spa,vdev_t * vd,int error)967 spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error)
968 {
969 if (vd != NULL || error == 0)
970 vdev_dtl_reassess(vd ? vd->vdev_top : spa->spa_root_vdev,
971 0, 0, B_FALSE);
972
973 if (vd != NULL) {
974 vdev_state_dirty(vd->vdev_top);
975 spa->spa_config_generation++;
976 }
977
978 ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL);
979 spa_config_exit(spa, spa->spa_vdev_locks, spa);
980
981 /*
982 * If anything changed, wait for it to sync. This ensures that,
983 * from the system administrator's perspective, zpool(1M) commands
984 * are synchronous. This is important for things like zpool offline:
985 * when the command completes, you expect no further I/O from ZFS.
986 */
987 if (vd != NULL)
988 txg_wait_synced(spa->spa_dsl_pool, 0);
989
990 return (error);
991 }
992
993 /*
994 * ==========================================================================
995 * Miscellaneous functions
996 * ==========================================================================
997 */
998
999 /*
1000 * Rename a spa_t.
1001 */
1002 int
spa_rename(const char * name,const char * newname)1003 spa_rename(const char *name, const char *newname)
1004 {
1005 spa_t *spa;
1006 int err;
1007
1008 /*
1009 * Lookup the spa_t and grab the config lock for writing. We need to
1010 * actually open the pool so that we can sync out the necessary labels.
1011 * It's OK to call spa_open() with the namespace lock held because we
1012 * allow recursive calls for other reasons.
1013 */
1014 mutex_enter(&spa_namespace_lock);
1015 if ((err = spa_open(name, &spa, FTAG)) != 0) {
1016 mutex_exit(&spa_namespace_lock);
1017 return (err);
1018 }
1019
1020 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1021
1022 avl_remove(&spa_namespace_avl, spa);
1023 (void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name));
1024 avl_add(&spa_namespace_avl, spa);
1025
1026 /*
1027 * Sync all labels to disk with the new names by marking the root vdev
1028 * dirty and waiting for it to sync. It will pick up the new pool name
1029 * during the sync.
1030 */
1031 vdev_config_dirty(spa->spa_root_vdev);
1032
1033 spa_config_exit(spa, SCL_ALL, FTAG);
1034
1035 txg_wait_synced(spa->spa_dsl_pool, 0);
1036
1037 /*
1038 * Sync the updated config cache.
1039 */
1040 spa_config_sync(spa, B_FALSE, B_TRUE);
1041
1042 spa_close(spa, FTAG);
1043
1044 mutex_exit(&spa_namespace_lock);
1045
1046 return (0);
1047 }
1048
1049
1050 /*
1051 * Determine whether a pool with given pool_guid exists. If device_guid is
1052 * non-zero, determine whether the pool exists *and* contains a device with the
1053 * specified device_guid.
1054 */
1055 boolean_t
spa_guid_exists(uint64_t pool_guid,uint64_t device_guid)1056 spa_guid_exists(uint64_t pool_guid, uint64_t device_guid)
1057 {
1058 spa_t *spa;
1059 avl_tree_t *t = &spa_namespace_avl;
1060
1061 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1062
1063 for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) {
1064 if (spa->spa_state == POOL_STATE_UNINITIALIZED)
1065 continue;
1066 if (spa->spa_root_vdev == NULL)
1067 continue;
1068 if (spa_guid(spa) == pool_guid) {
1069 if (device_guid == 0)
1070 break;
1071
1072 if (vdev_lookup_by_guid(spa->spa_root_vdev,
1073 device_guid) != NULL)
1074 break;
1075
1076 /*
1077 * Check any devices we may be in the process of adding.
1078 */
1079 if (spa->spa_pending_vdev) {
1080 if (vdev_lookup_by_guid(spa->spa_pending_vdev,
1081 device_guid) != NULL)
1082 break;
1083 }
1084 }
1085 }
1086
1087 return (spa != NULL);
1088 }
1089
1090 char *
spa_strdup(const char * s)1091 spa_strdup(const char *s)
1092 {
1093 size_t len;
1094 char *new;
1095
1096 len = strlen(s);
1097 new = kmem_alloc(len + 1, KM_SLEEP);
1098 bcopy(s, new, len);
1099 new[len] = '\0';
1100
1101 return (new);
1102 }
1103
1104 void
spa_strfree(char * s)1105 spa_strfree(char *s)
1106 {
1107 kmem_free(s, strlen(s) + 1);
1108 }
1109
1110 uint64_t
spa_get_random(uint64_t range)1111 spa_get_random(uint64_t range)
1112 {
1113 uint64_t r;
1114
1115 ASSERT(range != 0);
1116
1117 (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t));
1118
1119 return (r % range);
1120 }
1121
1122 uint64_t
spa_generate_guid(spa_t * spa)1123 spa_generate_guid(spa_t *spa)
1124 {
1125 uint64_t guid = spa_get_random(-1ULL);
1126
1127 if (spa != NULL) {
1128 while (guid == 0 || spa_guid_exists(spa_guid(spa), guid))
1129 guid = spa_get_random(-1ULL);
1130 } else {
1131 while (guid == 0 || spa_guid_exists(guid, 0))
1132 guid = spa_get_random(-1ULL);
1133 }
1134
1135 return (guid);
1136 }
1137
1138 void
snprintf_blkptr(char * buf,size_t buflen,const blkptr_t * bp)1139 snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp)
1140 {
1141 char *type = dmu_ot[BP_GET_TYPE(bp)].ot_name;
1142 char *checksum = zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name;
1143 char *compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name;
1144
1145 SNPRINTF_BLKPTR(snprintf, ' ', buf, buflen, bp, type, checksum, compress);
1146 }
1147
1148 void
spa_freeze(spa_t * spa)1149 spa_freeze(spa_t *spa)
1150 {
1151 uint64_t freeze_txg = 0;
1152
1153 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1154 if (spa->spa_freeze_txg == UINT64_MAX) {
1155 freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE;
1156 spa->spa_freeze_txg = freeze_txg;
1157 }
1158 spa_config_exit(spa, SCL_ALL, FTAG);
1159 if (freeze_txg != 0)
1160 txg_wait_synced(spa_get_dsl(spa), freeze_txg);
1161 }
1162
1163 void
zfs_panic_recover(const char * fmt,...)1164 zfs_panic_recover(const char *fmt, ...)
1165 {
1166 va_list adx;
1167
1168 va_start(adx, fmt);
1169 vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
1170 va_end(adx);
1171 }
1172
1173 /*
1174 * ==========================================================================
1175 * Accessor functions
1176 * ==========================================================================
1177 */
1178
1179 boolean_t
spa_shutting_down(spa_t * spa)1180 spa_shutting_down(spa_t *spa)
1181 {
1182 return (spa->spa_async_suspended);
1183 }
1184
1185 dsl_pool_t *
spa_get_dsl(spa_t * spa)1186 spa_get_dsl(spa_t *spa)
1187 {
1188 return (spa->spa_dsl_pool);
1189 }
1190
1191 blkptr_t *
spa_get_rootblkptr(spa_t * spa)1192 spa_get_rootblkptr(spa_t *spa)
1193 {
1194 return (&spa->spa_ubsync.ub_rootbp);
1195 }
1196
1197 void
spa_set_rootblkptr(spa_t * spa,const blkptr_t * bp)1198 spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp)
1199 {
1200 spa->spa_uberblock.ub_rootbp = *bp;
1201 }
1202
1203 void
spa_altroot(spa_t * spa,char * buf,size_t buflen)1204 spa_altroot(spa_t *spa, char *buf, size_t buflen)
1205 {
1206 if (spa->spa_root == NULL)
1207 buf[0] = '\0';
1208 else
1209 (void) strncpy(buf, spa->spa_root, buflen);
1210 }
1211
1212 int
spa_sync_pass(spa_t * spa)1213 spa_sync_pass(spa_t *spa)
1214 {
1215 return (spa->spa_sync_pass);
1216 }
1217
1218 char *
spa_name(spa_t * spa)1219 spa_name(spa_t *spa)
1220 {
1221 return (spa->spa_name);
1222 }
1223
1224 uint64_t
spa_guid(spa_t * spa)1225 spa_guid(spa_t *spa)
1226 {
1227 /*
1228 * If we fail to parse the config during spa_load(), we can go through
1229 * the error path (which posts an ereport) and end up here with no root
1230 * vdev. We stash the original pool guid in 'spa_load_guid' to handle
1231 * this case.
1232 */
1233 if (spa->spa_root_vdev != NULL)
1234 return (spa->spa_root_vdev->vdev_guid);
1235 else
1236 return (spa->spa_load_guid);
1237 }
1238
1239 uint64_t
spa_last_synced_txg(spa_t * spa)1240 spa_last_synced_txg(spa_t *spa)
1241 {
1242 return (spa->spa_ubsync.ub_txg);
1243 }
1244
1245 uint64_t
spa_first_txg(spa_t * spa)1246 spa_first_txg(spa_t *spa)
1247 {
1248 return (spa->spa_first_txg);
1249 }
1250
1251 uint64_t
spa_syncing_txg(spa_t * spa)1252 spa_syncing_txg(spa_t *spa)
1253 {
1254 return (spa->spa_syncing_txg);
1255 }
1256
1257 pool_state_t
spa_state(spa_t * spa)1258 spa_state(spa_t *spa)
1259 {
1260 return (spa->spa_state);
1261 }
1262
1263 spa_load_state_t
spa_load_state(spa_t * spa)1264 spa_load_state(spa_t *spa)
1265 {
1266 return (spa->spa_load_state);
1267 }
1268
1269 uint64_t
spa_freeze_txg(spa_t * spa)1270 spa_freeze_txg(spa_t *spa)
1271 {
1272 return (spa->spa_freeze_txg);
1273 }
1274
1275 /* ARGSUSED */
1276 uint64_t
spa_get_asize(spa_t * spa,uint64_t lsize)1277 spa_get_asize(spa_t *spa, uint64_t lsize)
1278 {
1279 /*
1280 * The worst case is single-sector max-parity RAID-Z blocks, in which
1281 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
1282 * times the size; so just assume that. Add to this the fact that
1283 * we can have up to 3 DVAs per bp, and one more factor of 2 because
1284 * the block may be dittoed with up to 3 DVAs by ddt_sync().
1285 */
1286 return (lsize * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2);
1287 }
1288
1289 uint64_t
spa_get_dspace(spa_t * spa)1290 spa_get_dspace(spa_t *spa)
1291 {
1292 return (spa->spa_dspace);
1293 }
1294
1295 void
spa_update_dspace(spa_t * spa)1296 spa_update_dspace(spa_t *spa)
1297 {
1298 spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) +
1299 ddt_get_dedup_dspace(spa);
1300 }
1301
1302 /*
1303 * Return the failure mode that has been set to this pool. The default
1304 * behavior will be to block all I/Os when a complete failure occurs.
1305 */
1306 uint8_t
spa_get_failmode(spa_t * spa)1307 spa_get_failmode(spa_t *spa)
1308 {
1309 return (spa->spa_failmode);
1310 }
1311
1312 boolean_t
spa_suspended(spa_t * spa)1313 spa_suspended(spa_t *spa)
1314 {
1315 return (spa->spa_suspended);
1316 }
1317
1318 uint64_t
spa_version(spa_t * spa)1319 spa_version(spa_t *spa)
1320 {
1321 return (spa->spa_ubsync.ub_version);
1322 }
1323
1324 boolean_t
spa_deflate(spa_t * spa)1325 spa_deflate(spa_t *spa)
1326 {
1327 return (spa->spa_deflate);
1328 }
1329
1330 metaslab_class_t *
spa_normal_class(spa_t * spa)1331 spa_normal_class(spa_t *spa)
1332 {
1333 return (spa->spa_normal_class);
1334 }
1335
1336 metaslab_class_t *
spa_log_class(spa_t * spa)1337 spa_log_class(spa_t *spa)
1338 {
1339 return (spa->spa_log_class);
1340 }
1341
1342 int
spa_max_replication(spa_t * spa)1343 spa_max_replication(spa_t *spa)
1344 {
1345 /*
1346 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
1347 * handle BPs with more than one DVA allocated. Set our max
1348 * replication level accordingly.
1349 */
1350 if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS)
1351 return (1);
1352 return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override));
1353 }
1354
1355 uint64_t
dva_get_dsize_sync(spa_t * spa,const dva_t * dva)1356 dva_get_dsize_sync(spa_t *spa, const dva_t *dva)
1357 {
1358 uint64_t asize = DVA_GET_ASIZE(dva);
1359 uint64_t dsize = asize;
1360
1361 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
1362
1363 if (asize != 0 && spa->spa_deflate) {
1364 vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));
1365 dsize = (asize >> SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio;
1366 }
1367
1368 return (dsize);
1369 }
1370
1371 uint64_t
bp_get_dsize_sync(spa_t * spa,const blkptr_t * bp)1372 bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp)
1373 {
1374 uint64_t dsize = 0;
1375
1376 for (int d = 0; d < SPA_DVAS_PER_BP; d++)
1377 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
1378
1379 return (dsize);
1380 }
1381
1382 uint64_t
bp_get_dsize(spa_t * spa,const blkptr_t * bp)1383 bp_get_dsize(spa_t *spa, const blkptr_t *bp)
1384 {
1385 uint64_t dsize = 0;
1386
1387 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
1388
1389 for (int d = 0; d < SPA_DVAS_PER_BP; d++)
1390 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
1391
1392 spa_config_exit(spa, SCL_VDEV, FTAG);
1393
1394 return (dsize);
1395 }
1396
1397 /*
1398 * ==========================================================================
1399 * Initialization and Termination
1400 * ==========================================================================
1401 */
1402
1403 static int
spa_name_compare(const void * a1,const void * a2)1404 spa_name_compare(const void *a1, const void *a2)
1405 {
1406 const spa_t *s1 = a1;
1407 const spa_t *s2 = a2;
1408 int s;
1409
1410 s = strcmp(s1->spa_name, s2->spa_name);
1411 if (s > 0)
1412 return (1);
1413 if (s < 0)
1414 return (-1);
1415 return (0);
1416 }
1417
1418 int
spa_busy(void)1419 spa_busy(void)
1420 {
1421 return (spa_active_count);
1422 }
1423
1424 void
spa_boot_init()1425 spa_boot_init()
1426 {
1427 spa_config_load();
1428 }
1429
1430 void
spa_init(int mode)1431 spa_init(int mode)
1432 {
1433 mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL);
1434 mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL);
1435 mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL);
1436 cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL);
1437
1438 avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t),
1439 offsetof(spa_t, spa_avl));
1440
1441 avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t),
1442 offsetof(spa_aux_t, aux_avl));
1443
1444 avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t),
1445 offsetof(spa_aux_t, aux_avl));
1446
1447 spa_mode_global = mode;
1448
1449 refcount_init();
1450 unique_init();
1451 zio_init();
1452 dmu_init();
1453 zil_init();
1454 vdev_cache_stat_init();
1455 zfs_prop_init();
1456 zpool_prop_init();
1457 spa_config_load();
1458 l2arc_start();
1459 }
1460
1461 void
spa_fini(void)1462 spa_fini(void)
1463 {
1464 l2arc_stop();
1465
1466 spa_evict_all();
1467
1468 vdev_cache_stat_fini();
1469 zil_fini();
1470 dmu_fini();
1471 zio_fini();
1472 unique_fini();
1473 refcount_fini();
1474
1475 avl_destroy(&spa_namespace_avl);
1476 avl_destroy(&spa_spare_avl);
1477 avl_destroy(&spa_l2cache_avl);
1478
1479 cv_destroy(&spa_namespace_cv);
1480 mutex_destroy(&spa_namespace_lock);
1481 mutex_destroy(&spa_spare_lock);
1482 mutex_destroy(&spa_l2cache_lock);
1483 }
1484
1485 /*
1486 * Return whether this pool has slogs. No locking needed.
1487 * It's not a problem if the wrong answer is returned as it's only for
1488 * performance and not correctness
1489 */
1490 boolean_t
spa_has_slogs(spa_t * spa)1491 spa_has_slogs(spa_t *spa)
1492 {
1493 return (spa->spa_log_class->mc_rotor != NULL);
1494 }
1495
1496 spa_log_state_t
spa_get_log_state(spa_t * spa)1497 spa_get_log_state(spa_t *spa)
1498 {
1499 return (spa->spa_log_state);
1500 }
1501
1502 void
spa_set_log_state(spa_t * spa,spa_log_state_t state)1503 spa_set_log_state(spa_t *spa, spa_log_state_t state)
1504 {
1505 spa->spa_log_state = state;
1506 }
1507
1508 boolean_t
spa_is_root(spa_t * spa)1509 spa_is_root(spa_t *spa)
1510 {
1511 return (spa->spa_is_root);
1512 }
1513
1514 boolean_t
spa_writeable(spa_t * spa)1515 spa_writeable(spa_t *spa)
1516 {
1517 return (!!(spa->spa_mode & FWRITE));
1518 }
1519
1520 int
spa_mode(spa_t * spa)1521 spa_mode(spa_t *spa)
1522 {
1523 return (spa->spa_mode);
1524 }
1525
1526 uint64_t
spa_bootfs(spa_t * spa)1527 spa_bootfs(spa_t *spa)
1528 {
1529 return (spa->spa_bootfs);
1530 }
1531
1532 uint64_t
spa_delegation(spa_t * spa)1533 spa_delegation(spa_t *spa)
1534 {
1535 return (spa->spa_delegation);
1536 }
1537
1538 objset_t *
spa_meta_objset(spa_t * spa)1539 spa_meta_objset(spa_t *spa)
1540 {
1541 return (spa->spa_meta_objset);
1542 }
1543
1544 enum zio_checksum
spa_dedup_checksum(spa_t * spa)1545 spa_dedup_checksum(spa_t *spa)
1546 {
1547 return (spa->spa_dedup_checksum);
1548 }
1549