1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * This file and its contents are supplied under the terms of the
4 * Common Development and Distribution License ("CDDL"), version 1.0.
5 * You may only use this file in accordance with the terms of version
6 * 1.0 of the CDDL.
7 *
8 * A full copy of the text of the CDDL should have accompanied this
9 * source. A copy of the CDDL is also available via the Internet at
10 * https://opensource.org/license/CDDL-1.0.
11 */
12 /*
13 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
14 * Copyright (c) 2011, 2024 by Delphix. All rights reserved.
15 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
16 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
17 * Copyright 2013 Saso Kiselkov. All rights reserved.
18 * Copyright (c) 2017 Datto Inc.
19 * Copyright (c) 2017, Intel Corporation.
20 * Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
21 * Copyright (c) 2023, 2024, 2025, Klara, Inc.
22 */
23
24 #include <sys/zfs_context.h>
25 #include <sys/zfs_chksum.h>
26 #include <sys/spa_impl.h>
27 #include <sys/zio.h>
28 #include <sys/zio_checksum.h>
29 #include <sys/zio_compress.h>
30 #include <sys/dmu.h>
31 #include <sys/dmu_tx.h>
32 #include <sys/zap.h>
33 #include <sys/zil.h>
34 #include <sys/vdev_impl.h>
35 #include <sys/vdev_initialize.h>
36 #include <sys/vdev_trim.h>
37 #include <sys/vdev_file.h>
38 #include <sys/vdev_raidz.h>
39 #include <sys/metaslab.h>
40 #include <sys/uberblock_impl.h>
41 #include <sys/txg.h>
42 #include <sys/avl.h>
43 #include <sys/unique.h>
44 #include <sys/dsl_pool.h>
45 #include <sys/dsl_dir.h>
46 #include <sys/dsl_prop.h>
47 #include <sys/fm/util.h>
48 #include <sys/dsl_scan.h>
49 #include <sys/fs/zfs.h>
50 #include <sys/metaslab_impl.h>
51 #include <sys/arc.h>
52 #include <sys/brt.h>
53 #include <sys/ddt.h>
54 #include <sys/kstat.h>
55 #include "zfs_prop.h"
56 #include <sys/btree.h>
57 #include <sys/zfeature.h>
58 #include <sys/qat.h>
59 #include <sys/zstd/zstd.h>
60
61 /*
62 * SPA locking
63 *
64 * There are three basic locks for managing spa_t structures:
65 *
66 * spa_namespace_lock (global mutex)
67 *
68 * This lock must be acquired to do any of the following:
69 *
70 * - Lookup a spa_t by name
71 * - Add or remove a spa_t from the namespace
72 * - Increase spa_refcount from non-zero
73 * - Check if spa_refcount is zero
74 * - Rename a spa_t
75 * - add/remove/attach/detach devices
76 * - Held for the duration of create/destroy
77 * - Held at the start and end of import and export
78 *
79 * It does not need to handle recursion. A create or destroy may
80 * reference objects (files or zvols) in other pools, but by
81 * definition they must have an existing reference, and will never need
82 * to lookup a spa_t by name.
83 *
84 * spa_refcount (per-spa zfs_refcount_t protected by mutex)
85 *
86 * This reference count keep track of any active users of the spa_t. The
87 * spa_t cannot be destroyed or freed while this is non-zero. Internally,
88 * the refcount is never really 'zero' - opening a pool implicitly keeps
89 * some references in the DMU. Internally we check against spa_minref, but
90 * present the image of a zero/non-zero value to consumers.
91 *
92 * spa_config_lock[] (per-spa array of rwlocks)
93 *
94 * This protects the spa_t from config changes, and must be held in
95 * the following circumstances:
96 *
97 * - RW_READER to perform I/O to the spa
98 * - RW_WRITER to change the vdev config
99 *
100 * The locking order is fairly straightforward:
101 *
102 * spa_namespace_lock -> spa_refcount
103 *
104 * The namespace lock must be acquired to increase the refcount from 0
105 * or to check if it is zero.
106 *
107 * spa_refcount -> spa_config_lock[]
108 *
109 * There must be at least one valid reference on the spa_t to acquire
110 * the config lock.
111 *
112 * spa_namespace_lock -> spa_config_lock[]
113 *
114 * The namespace lock must always be taken before the config lock.
115 *
116 *
117 * The spa_namespace_lock can be acquired directly and is globally visible.
118 *
119 * The namespace is manipulated using the following functions, all of which
120 * require the spa_namespace_lock to be held.
121 *
122 * spa_lookup() Lookup a spa_t by name.
123 *
124 * spa_add() Create a new spa_t in the namespace.
125 *
126 * spa_remove() Remove a spa_t from the namespace. This also
127 * frees up any memory associated with the spa_t.
128 *
129 * spa_next() Returns the next spa_t in the system, or the
130 * first if NULL is passed.
131 *
132 * spa_evict_all() Shutdown and remove all spa_t structures in
133 * the system.
134 *
135 * spa_guid_exists() Determine whether a pool/device guid exists.
136 *
137 * The spa_refcount is manipulated using the following functions:
138 *
139 * spa_open_ref() Adds a reference to the given spa_t. Must be
140 * called with spa_namespace_lock held if the
141 * refcount is currently zero.
142 *
143 * spa_close() Remove a reference from the spa_t. This will
144 * not free the spa_t or remove it from the
145 * namespace. No locking is required.
146 *
147 * spa_refcount_zero() Returns true if the refcount is currently
148 * zero. Must be called with spa_namespace_lock
149 * held.
150 *
151 * The spa_config_lock[] is an array of rwlocks, ordered as follows:
152 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
153 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
154 *
155 * To read the configuration, it suffices to hold one of these locks as reader.
156 * To modify the configuration, you must hold all locks as writer. To modify
157 * vdev state without altering the vdev tree's topology (e.g. online/offline),
158 * you must hold SCL_STATE and SCL_ZIO as writer.
159 *
160 * We use these distinct config locks to avoid recursive lock entry.
161 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
162 * block allocations (SCL_ALLOC), which may require reading space maps
163 * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
164 *
165 * The spa config locks cannot be normal rwlocks because we need the
166 * ability to hand off ownership. For example, SCL_ZIO is acquired
167 * by the issuing thread and later released by an interrupt thread.
168 * They do, however, obey the usual write-wanted semantics to prevent
169 * writer (i.e. system administrator) starvation.
170 *
171 * The lock acquisition rules are as follows:
172 *
173 * SCL_CONFIG
174 * Protects changes to the vdev tree topology, such as vdev
175 * add/remove/attach/detach. Protects the dirty config list
176 * (spa_config_dirty_list) and the set of spares and l2arc devices.
177 *
178 * SCL_STATE
179 * Protects changes to pool state and vdev state, such as vdev
180 * online/offline/fault/degrade/clear. Protects the dirty state list
181 * (spa_state_dirty_list) and global pool state (spa_state).
182 *
183 * SCL_ALLOC
184 * Protects changes to metaslab groups and classes.
185 * Held as reader by metaslab_alloc() and metaslab_claim().
186 *
187 * SCL_ZIO
188 * Held by bp-level zios (those which have no io_vd upon entry)
189 * to prevent changes to the vdev tree. The bp-level zio implicitly
190 * protects all of its vdev child zios, which do not hold SCL_ZIO.
191 *
192 * SCL_FREE
193 * Protects changes to metaslab groups and classes.
194 * Held as reader by metaslab_free(). SCL_FREE is distinct from
195 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
196 * blocks in zio_done() while another i/o that holds either
197 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
198 *
199 * SCL_VDEV
200 * Held as reader to prevent changes to the vdev tree during trivial
201 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
202 * other locks, and lower than all of them, to ensure that it's safe
203 * to acquire regardless of caller context.
204 *
205 * In addition, the following rules apply:
206 *
207 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
208 * The lock ordering is SCL_CONFIG > spa_props_lock.
209 *
210 * (b) I/O operations on leaf vdevs. For any zio operation that takes
211 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
212 * or zio_write_phys() -- the caller must ensure that the config cannot
213 * cannot change in the interim, and that the vdev cannot be reopened.
214 * SCL_STATE as reader suffices for both.
215 *
216 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
217 *
218 * spa_vdev_enter() Acquire the namespace lock and the config lock
219 * for writing.
220 *
221 * spa_vdev_exit() Release the config lock, wait for all I/O
222 * to complete, sync the updated configs to the
223 * cache, and release the namespace lock.
224 *
225 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
226 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
227 * locking is, always, based on spa_namespace_lock and spa_config_lock[].
228 */
229
230 static avl_tree_t spa_namespace_avl;
231 static kmutex_t spa_namespace_lock;
232 static kcondvar_t spa_namespace_cv;
233
234 static const int spa_max_replication_override = SPA_DVAS_PER_BP;
235
236 static kmutex_t spa_spare_lock;
237 static avl_tree_t spa_spare_avl;
238 static kmutex_t spa_l2cache_lock;
239 static avl_tree_t spa_l2cache_avl;
240
241 spa_mode_t spa_mode_global = SPA_MODE_UNINIT;
242
243 #ifdef ZFS_DEBUG
244 /*
245 * Everything except dprintf, set_error, indirect_remap, and raidz_reconstruct
246 * is on by default in debug builds.
247 */
248 int zfs_flags = ~(ZFS_DEBUG_DPRINTF | ZFS_DEBUG_SET_ERROR |
249 ZFS_DEBUG_INDIRECT_REMAP | ZFS_DEBUG_RAIDZ_RECONSTRUCT);
250 #else
251 int zfs_flags = 0;
252 #endif
253
254 /*
255 * zfs_recover can be set to nonzero to attempt to recover from
256 * otherwise-fatal errors, typically caused by on-disk corruption. When
257 * set, calls to zfs_panic_recover() will turn into warning messages.
258 * This should only be used as a last resort, as it typically results
259 * in leaked space, or worse.
260 */
261 int zfs_recover = B_FALSE;
262
263 /*
264 * If destroy encounters an EIO while reading metadata (e.g. indirect
265 * blocks), space referenced by the missing metadata can not be freed.
266 * Normally this causes the background destroy to become "stalled", as
267 * it is unable to make forward progress. While in this stalled state,
268 * all remaining space to free from the error-encountering filesystem is
269 * "temporarily leaked". Set this flag to cause it to ignore the EIO,
270 * permanently leak the space from indirect blocks that can not be read,
271 * and continue to free everything else that it can.
272 *
273 * The default, "stalling" behavior is useful if the storage partially
274 * fails (i.e. some but not all i/os fail), and then later recovers. In
275 * this case, we will be able to continue pool operations while it is
276 * partially failed, and when it recovers, we can continue to free the
277 * space, with no leaks. However, note that this case is actually
278 * fairly rare.
279 *
280 * Typically pools either (a) fail completely (but perhaps temporarily,
281 * e.g. a top-level vdev going offline), or (b) have localized,
282 * permanent errors (e.g. disk returns the wrong data due to bit flip or
283 * firmware bug). In case (a), this setting does not matter because the
284 * pool will be suspended and the sync thread will not be able to make
285 * forward progress regardless. In case (b), because the error is
286 * permanent, the best we can do is leak the minimum amount of space,
287 * which is what setting this flag will do. Therefore, it is reasonable
288 * for this flag to normally be set, but we chose the more conservative
289 * approach of not setting it, so that there is no possibility of
290 * leaking space in the "partial temporary" failure case.
291 */
292 int zfs_free_leak_on_eio = B_FALSE;
293
294 /*
295 * Expiration time in milliseconds. This value has two meanings. First it is
296 * used to determine when the spa_deadman() logic should fire. By default the
297 * spa_deadman() will fire if spa_sync() has not completed in 600 seconds.
298 * Secondly, the value determines if an I/O is considered "hung". Any I/O that
299 * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting
300 * in one of three behaviors controlled by zfs_deadman_failmode.
301 */
302 uint64_t zfs_deadman_synctime_ms = 600000UL; /* 10 min. */
303
304 /*
305 * This value controls the maximum amount of time zio_wait() will block for an
306 * outstanding IO. By default this is 300 seconds at which point the "hung"
307 * behavior will be applied as described for zfs_deadman_synctime_ms.
308 */
309 uint64_t zfs_deadman_ziotime_ms = 300000UL; /* 5 min. */
310
311 /*
312 * Check time in milliseconds. This defines the frequency at which we check
313 * for hung I/O.
314 */
315 uint64_t zfs_deadman_checktime_ms = 60000UL; /* 1 min. */
316
317 /*
318 * By default the deadman is enabled.
319 */
320 int zfs_deadman_enabled = B_TRUE;
321
322 /*
323 * Controls the behavior of the deadman when it detects a "hung" I/O.
324 * Valid values are zfs_deadman_failmode=<wait|continue|panic>.
325 *
326 * wait - Wait for the "hung" I/O (default)
327 * continue - Attempt to recover from a "hung" I/O
328 * panic - Panic the system
329 */
330 const char *zfs_deadman_failmode = "wait";
331
332 /*
333 * The worst case is single-sector max-parity RAID-Z blocks, in which
334 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
335 * times the size; so just assume that. Add to this the fact that
336 * we can have up to 3 DVAs per bp, and one more factor of 2 because
337 * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together,
338 * the worst case is:
339 * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
340 */
341 uint_t spa_asize_inflation = 24;
342
343 /*
344 * Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in
345 * the pool to be consumed (bounded by spa_max_slop). This ensures that we
346 * don't run the pool completely out of space, due to unaccounted changes (e.g.
347 * to the MOS). It also limits the worst-case time to allocate space. If we
348 * have less than this amount of free space, most ZPL operations (e.g. write,
349 * create) will return ENOSPC. The ZIL metaslabs (spa_embedded_log_class) are
350 * also part of this 3.2% of space which can't be consumed by normal writes;
351 * the slop space "proper" (spa_get_slop_space()) is decreased by the embedded
352 * log space.
353 *
354 * Certain operations (e.g. file removal, most administrative actions) can
355 * use half the slop space. They will only return ENOSPC if less than half
356 * the slop space is free. Typically, once the pool has less than the slop
357 * space free, the user will use these operations to free up space in the pool.
358 * These are the operations that call dsl_pool_adjustedsize() with the netfree
359 * argument set to TRUE.
360 *
361 * Operations that are almost guaranteed to free up space in the absence of
362 * a pool checkpoint can use up to three quarters of the slop space
363 * (e.g zfs destroy).
364 *
365 * A very restricted set of operations are always permitted, regardless of
366 * the amount of free space. These are the operations that call
367 * dsl_sync_task(ZFS_SPACE_CHECK_NONE). If these operations result in a net
368 * increase in the amount of space used, it is possible to run the pool
369 * completely out of space, causing it to be permanently read-only.
370 *
371 * Note that on very small pools, the slop space will be larger than
372 * 3.2%, in an effort to have it be at least spa_min_slop (128MB),
373 * but we never allow it to be more than half the pool size.
374 *
375 * Further, on very large pools, the slop space will be smaller than
376 * 3.2%, to avoid reserving much more space than we actually need; bounded
377 * by spa_max_slop (128GB).
378 *
379 * See also the comments in zfs_space_check_t.
380 */
381 uint_t spa_slop_shift = 5;
382 static const uint64_t spa_min_slop = 128ULL * 1024 * 1024;
383 static const uint64_t spa_max_slop = 128ULL * 1024 * 1024 * 1024;
384
385 /*
386 * Number of allocators to use, per spa instance
387 */
388 static int spa_num_allocators = 4;
389 static int spa_cpus_per_allocator = 4;
390
391 /*
392 * Spa active allocator.
393 * Valid values are zfs_active_allocator=<dynamic|cursor|new-dynamic>.
394 */
395 const char *zfs_active_allocator = "dynamic";
396
397 void
spa_load_failed(spa_t * spa,const char * fmt,...)398 spa_load_failed(spa_t *spa, const char *fmt, ...)
399 {
400 va_list adx;
401 char buf[256];
402
403 va_start(adx, fmt);
404 (void) vsnprintf(buf, sizeof (buf), fmt, adx);
405 va_end(adx);
406
407 zfs_dbgmsg("spa_load(%s, config %s): FAILED: %s", spa_load_name(spa),
408 spa->spa_trust_config ? "trusted" : "untrusted", buf);
409 }
410
411 void
spa_load_note(spa_t * spa,const char * fmt,...)412 spa_load_note(spa_t *spa, const char *fmt, ...)
413 {
414 va_list adx;
415 char buf[256];
416
417 va_start(adx, fmt);
418 (void) vsnprintf(buf, sizeof (buf), fmt, adx);
419 va_end(adx);
420
421 zfs_dbgmsg("spa_load(%s, config %s): %s", spa_load_name(spa),
422 spa->spa_trust_config ? "trusted" : "untrusted", buf);
423
424 spa_import_progress_set_notes_nolog(spa, "%s", buf);
425 }
426
427 /*
428 * By default dedup and user data indirects land in the special class
429 */
430 static int zfs_ddt_data_is_special = B_TRUE;
431 static int zfs_user_indirect_is_special = B_TRUE;
432
433 /*
434 * The percentage of special class final space reserved for metadata only.
435 * Once we allocate 100 - zfs_special_class_metadata_reserve_pct we only
436 * let metadata into the class.
437 */
438 static uint_t zfs_special_class_metadata_reserve_pct = 25;
439
440 /*
441 * ==========================================================================
442 * SPA config locking
443 * ==========================================================================
444 */
445 static void
spa_config_lock_init(spa_t * spa)446 spa_config_lock_init(spa_t *spa)
447 {
448 for (int i = 0; i < SCL_LOCKS; i++) {
449 spa_config_lock_t *scl = &spa->spa_config_lock[i];
450 mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL);
451 cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL);
452 scl->scl_writer = NULL;
453 scl->scl_write_wanted = 0;
454 scl->scl_count = 0;
455 }
456 }
457
458 static void
spa_config_lock_destroy(spa_t * spa)459 spa_config_lock_destroy(spa_t *spa)
460 {
461 for (int i = 0; i < SCL_LOCKS; i++) {
462 spa_config_lock_t *scl = &spa->spa_config_lock[i];
463 mutex_destroy(&scl->scl_lock);
464 cv_destroy(&scl->scl_cv);
465 ASSERT0P(scl->scl_writer);
466 ASSERT0(scl->scl_write_wanted);
467 ASSERT0(scl->scl_count);
468 }
469 }
470
471 int
spa_config_tryenter(spa_t * spa,int locks,const void * tag,krw_t rw)472 spa_config_tryenter(spa_t *spa, int locks, const void *tag, krw_t rw)
473 {
474 for (int i = 0; i < SCL_LOCKS; i++) {
475 spa_config_lock_t *scl = &spa->spa_config_lock[i];
476 if (!(locks & (1 << i)))
477 continue;
478 mutex_enter(&scl->scl_lock);
479 if (rw == RW_READER) {
480 if (scl->scl_writer || scl->scl_write_wanted) {
481 mutex_exit(&scl->scl_lock);
482 spa_config_exit(spa, locks & ((1 << i) - 1),
483 tag);
484 return (0);
485 }
486 } else {
487 ASSERT(scl->scl_writer != curthread);
488 if (scl->scl_count != 0) {
489 mutex_exit(&scl->scl_lock);
490 spa_config_exit(spa, locks & ((1 << i) - 1),
491 tag);
492 return (0);
493 }
494 scl->scl_writer = curthread;
495 }
496 scl->scl_count++;
497 mutex_exit(&scl->scl_lock);
498 }
499 return (1);
500 }
501
502 static void
spa_config_enter_impl(spa_t * spa,int locks,const void * tag,krw_t rw,int priority_flag)503 spa_config_enter_impl(spa_t *spa, int locks, const void *tag, krw_t rw,
504 int priority_flag)
505 {
506 (void) tag;
507 int wlocks_held = 0;
508
509 ASSERT3U(SCL_LOCKS, <, sizeof (wlocks_held) * NBBY);
510
511 for (int i = 0; i < SCL_LOCKS; i++) {
512 spa_config_lock_t *scl = &spa->spa_config_lock[i];
513 if (scl->scl_writer == curthread)
514 wlocks_held |= (1 << i);
515 if (!(locks & (1 << i)))
516 continue;
517 mutex_enter(&scl->scl_lock);
518 if (rw == RW_READER) {
519 while (scl->scl_writer ||
520 (!priority_flag && scl->scl_write_wanted)) {
521 cv_wait(&scl->scl_cv, &scl->scl_lock);
522 }
523 } else {
524 ASSERT(scl->scl_writer != curthread);
525 while (scl->scl_count != 0) {
526 scl->scl_write_wanted++;
527 cv_wait(&scl->scl_cv, &scl->scl_lock);
528 scl->scl_write_wanted--;
529 }
530 scl->scl_writer = curthread;
531 }
532 scl->scl_count++;
533 mutex_exit(&scl->scl_lock);
534 }
535 ASSERT3U(wlocks_held, <=, locks);
536 }
537
538 void
spa_config_enter(spa_t * spa,int locks,const void * tag,krw_t rw)539 spa_config_enter(spa_t *spa, int locks, const void *tag, krw_t rw)
540 {
541 spa_config_enter_impl(spa, locks, tag, rw, 0);
542 }
543
544 /*
545 * The spa_config_enter_priority() allows the mmp thread to cut in front of
546 * outstanding write lock requests. This is needed since the mmp updates are
547 * time sensitive and failure to service them promptly will result in a
548 * suspended pool. This pool suspension has been seen in practice when there is
549 * a single disk in a pool that is responding slowly and presumably about to
550 * fail.
551 */
552
553 void
spa_config_enter_priority(spa_t * spa,int locks,const void * tag,krw_t rw)554 spa_config_enter_priority(spa_t *spa, int locks, const void *tag, krw_t rw)
555 {
556 spa_config_enter_impl(spa, locks, tag, rw, 1);
557 }
558
559 void
spa_config_exit(spa_t * spa,int locks,const void * tag)560 spa_config_exit(spa_t *spa, int locks, const void *tag)
561 {
562 (void) tag;
563 for (int i = SCL_LOCKS - 1; i >= 0; i--) {
564 spa_config_lock_t *scl = &spa->spa_config_lock[i];
565 if (!(locks & (1 << i)))
566 continue;
567 mutex_enter(&scl->scl_lock);
568 ASSERT(scl->scl_count > 0);
569 if (--scl->scl_count == 0) {
570 ASSERT(scl->scl_writer == NULL ||
571 scl->scl_writer == curthread);
572 scl->scl_writer = NULL; /* OK in either case */
573 cv_broadcast(&scl->scl_cv);
574 }
575 mutex_exit(&scl->scl_lock);
576 }
577 }
578
579 int
spa_config_held(spa_t * spa,int locks,krw_t rw)580 spa_config_held(spa_t *spa, int locks, krw_t rw)
581 {
582 int locks_held = 0;
583
584 for (int i = 0; i < SCL_LOCKS; i++) {
585 spa_config_lock_t *scl = &spa->spa_config_lock[i];
586 if (!(locks & (1 << i)))
587 continue;
588 if ((rw == RW_READER && scl->scl_count != 0) ||
589 (rw == RW_WRITER && scl->scl_writer == curthread))
590 locks_held |= 1 << i;
591 }
592
593 return (locks_held);
594 }
595
596 /*
597 * ==========================================================================
598 * SPA namespace functions
599 * ==========================================================================
600 */
601
602 void
spa_namespace_enter(const void * tag)603 spa_namespace_enter(const void *tag)
604 {
605 (void) tag;
606 ASSERT(!MUTEX_HELD(&spa_namespace_lock));
607 mutex_enter(&spa_namespace_lock);
608 }
609
610 boolean_t
spa_namespace_tryenter(const void * tag)611 spa_namespace_tryenter(const void *tag)
612 {
613 (void) tag;
614 ASSERT(!MUTEX_HELD(&spa_namespace_lock));
615 return (mutex_tryenter(&spa_namespace_lock));
616 }
617
618 int
spa_namespace_enter_interruptible(const void * tag)619 spa_namespace_enter_interruptible(const void *tag)
620 {
621 (void) tag;
622 ASSERT(!MUTEX_HELD(&spa_namespace_lock));
623 return (mutex_enter_interruptible(&spa_namespace_lock));
624 }
625
626 void
spa_namespace_exit(const void * tag)627 spa_namespace_exit(const void *tag)
628 {
629 (void) tag;
630 ASSERT(MUTEX_HELD(&spa_namespace_lock));
631 mutex_exit(&spa_namespace_lock);
632 }
633
634 boolean_t
spa_namespace_held(void)635 spa_namespace_held(void)
636 {
637 return (MUTEX_HELD(&spa_namespace_lock));
638 }
639
640 void
spa_namespace_wait(void)641 spa_namespace_wait(void)
642 {
643 ASSERT(MUTEX_HELD(&spa_namespace_lock));
644 cv_wait(&spa_namespace_cv, &spa_namespace_lock);
645 }
646
647 void
spa_namespace_broadcast(void)648 spa_namespace_broadcast(void)
649 {
650 ASSERT(MUTEX_HELD(&spa_namespace_lock));
651 cv_broadcast(&spa_namespace_cv);
652 }
653
654 /*
655 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
656 * Returns NULL if no matching spa_t is found.
657 */
658 spa_t *
spa_lookup(const char * name)659 spa_lookup(const char *name)
660 {
661 static spa_t search; /* spa_t is large; don't allocate on stack */
662 spa_t *spa;
663 avl_index_t where;
664 char *cp;
665
666 ASSERT(spa_namespace_held());
667
668 retry:
669 (void) strlcpy(search.spa_name, name, sizeof (search.spa_name));
670
671 /*
672 * If it's a full dataset name, figure out the pool name and
673 * just use that.
674 */
675 cp = strpbrk(search.spa_name, "/@#");
676 if (cp != NULL)
677 *cp = '\0';
678
679 spa = avl_find(&spa_namespace_avl, &search, &where);
680 if (spa == NULL)
681 return (NULL);
682
683 /*
684 * Avoid racing with import/export, which don't hold the namespace
685 * lock for their entire duration.
686 */
687 if ((spa->spa_load_thread != NULL &&
688 spa->spa_load_thread != curthread) ||
689 (spa->spa_export_thread != NULL &&
690 spa->spa_export_thread != curthread)) {
691 spa_namespace_wait();
692 goto retry;
693 }
694
695 return (spa);
696 }
697
698 /*
699 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
700 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues
701 * looking for potentially hung I/Os.
702 */
703 void
spa_deadman(void * arg)704 spa_deadman(void *arg)
705 {
706 spa_t *spa = arg;
707
708 /* Disable the deadman if the pool is suspended. */
709 if (spa_suspended(spa))
710 return;
711
712 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
713 (getlrtime() - spa->spa_sync_starttime) / NANOSEC,
714 (u_longlong_t)++spa->spa_deadman_calls);
715 if (zfs_deadman_enabled)
716 vdev_deadman(spa->spa_root_vdev, FTAG);
717
718 spa->spa_deadman_tqid = taskq_dispatch_delay(system_delay_taskq,
719 spa_deadman, spa, TQ_SLEEP, ddi_get_lbolt() +
720 MSEC_TO_TICK(zfs_deadman_checktime_ms));
721 }
722
723 static int
spa_log_sm_sort_by_txg(const void * va,const void * vb)724 spa_log_sm_sort_by_txg(const void *va, const void *vb)
725 {
726 const spa_log_sm_t *a = va;
727 const spa_log_sm_t *b = vb;
728
729 return (TREE_CMP(a->sls_txg, b->sls_txg));
730 }
731
732 /*
733 * Create an uninitialized spa_t with the given name. Requires
734 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already
735 * exist by calling spa_lookup() first.
736 */
737 spa_t *
spa_add(const char * name,nvlist_t * config,const char * altroot)738 spa_add(const char *name, nvlist_t *config, const char *altroot)
739 {
740 spa_t *spa;
741 spa_config_dirent_t *dp;
742
743 ASSERT(spa_namespace_held());
744
745 spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP);
746
747 mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
748 mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
749 mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL);
750 mutex_init(&spa->spa_evicting_os_lock, NULL, MUTEX_DEFAULT, NULL);
751 mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL);
752 mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL);
753 mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL);
754 mutex_init(&spa->spa_cksum_tmpls_lock, NULL, MUTEX_DEFAULT, NULL);
755 mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL);
756 mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL);
757 mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL);
758 mutex_init(&spa->spa_feat_stats_lock, NULL, MUTEX_DEFAULT, NULL);
759 mutex_init(&spa->spa_flushed_ms_lock, NULL, MUTEX_DEFAULT, NULL);
760 mutex_init(&spa->spa_activities_lock, NULL, MUTEX_DEFAULT, NULL);
761 mutex_init(&spa->spa_txg_log_time_lock, NULL, MUTEX_DEFAULT, NULL);
762 mutex_init(&spa->spa_condense_stats_lock, NULL, MUTEX_DEFAULT, NULL);
763
764 cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL);
765 cv_init(&spa->spa_evicting_os_cv, NULL, CV_DEFAULT, NULL);
766 cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL);
767 cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL);
768 cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL);
769 cv_init(&spa->spa_activities_cv, NULL, CV_DEFAULT, NULL);
770 cv_init(&spa->spa_waiters_cv, NULL, CV_DEFAULT, NULL);
771
772 for (int t = 0; t < TXG_SIZE; t++)
773 bplist_create(&spa->spa_free_bplist[t]);
774
775 (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name));
776 spa->spa_state = POOL_STATE_UNINITIALIZED;
777 spa->spa_freeze_txg = UINT64_MAX;
778 spa->spa_final_txg = UINT64_MAX;
779 spa->spa_load_max_txg = UINT64_MAX;
780 spa->spa_proc = &p0;
781 spa->spa_proc_state = SPA_PROC_NONE;
782 spa->spa_trust_config = B_TRUE;
783 spa->spa_hostid = zone_get_hostid(NULL);
784
785 spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime_ms);
786 spa->spa_deadman_ziotime = MSEC2NSEC(zfs_deadman_ziotime_ms);
787 spa_set_deadman_failmode(spa, zfs_deadman_failmode);
788 spa_set_allocator(spa, zfs_active_allocator);
789
790 zfs_refcount_create(&spa->spa_refcount);
791 spa_config_lock_init(spa);
792 spa_stats_init(spa);
793
794 ASSERT(spa_namespace_held());
795 avl_add(&spa_namespace_avl, spa);
796
797 /*
798 * Set the alternate root, if there is one.
799 */
800 if (altroot)
801 spa->spa_root = spa_strdup(altroot);
802
803 /* Do not allow more allocators than fraction of CPUs. */
804 spa->spa_alloc_count = MAX(MIN(spa_num_allocators,
805 boot_ncpus / MAX(spa_cpus_per_allocator, 1)), 1);
806
807 if (spa->spa_alloc_count > 1) {
808 spa->spa_allocs_use = kmem_zalloc(offsetof(spa_allocs_use_t,
809 sau_inuse[spa->spa_alloc_count]), KM_SLEEP);
810 mutex_init(&spa->spa_allocs_use->sau_lock, NULL, MUTEX_DEFAULT,
811 NULL);
812 }
813
814 avl_create(&spa->spa_metaslabs_by_flushed, metaslab_sort_by_flushed,
815 sizeof (metaslab_t), offsetof(metaslab_t, ms_spa_txg_node));
816 avl_create(&spa->spa_sm_logs_by_txg, spa_log_sm_sort_by_txg,
817 sizeof (spa_log_sm_t), offsetof(spa_log_sm_t, sls_node));
818 list_create(&spa->spa_log_summary, sizeof (log_summary_entry_t),
819 offsetof(log_summary_entry_t, lse_node));
820
821 /*
822 * Every pool starts with the default cachefile
823 */
824 list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t),
825 offsetof(spa_config_dirent_t, scd_link));
826
827 dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP);
828 dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path);
829 list_insert_head(&spa->spa_config_list, dp);
830
831 VERIFY0(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME, KM_SLEEP));
832
833 if (config != NULL) {
834 nvlist_t *features;
835
836 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ,
837 &features) == 0) {
838 VERIFY0(nvlist_dup(features,
839 &spa->spa_label_features, 0));
840 }
841
842 VERIFY0(nvlist_dup(config, &spa->spa_config, 0));
843 }
844
845 if (spa->spa_label_features == NULL) {
846 VERIFY0(nvlist_alloc(&spa->spa_label_features, NV_UNIQUE_NAME,
847 KM_SLEEP));
848 }
849
850 spa->spa_min_ashift = INT_MAX;
851 spa->spa_max_ashift = 0;
852 spa->spa_min_alloc = INT_MAX;
853 spa->spa_max_alloc = 0;
854 spa->spa_gcd_alloc = INT_MAX;
855
856 /* Reset cached value */
857 spa->spa_dedup_dspace = ~0ULL;
858
859 /*
860 * As a pool is being created, treat all features as disabled by
861 * setting SPA_FEATURE_DISABLED for all entries in the feature
862 * refcount cache.
863 */
864 for (int i = 0; i < SPA_FEATURES; i++) {
865 spa->spa_feat_refcount_cache[i] = SPA_FEATURE_DISABLED;
866 }
867
868 list_create(&spa->spa_leaf_list, sizeof (vdev_t),
869 offsetof(vdev_t, vdev_leaf_node));
870
871 return (spa);
872 }
873
874 /*
875 * Removes a spa_t from the namespace, freeing up any memory used. Requires
876 * spa_namespace_lock. This is called only after the spa_t has been closed and
877 * deactivated.
878 */
879 void
spa_remove(spa_t * spa)880 spa_remove(spa_t *spa)
881 {
882 spa_config_dirent_t *dp;
883
884 ASSERT(spa_namespace_held());
885 ASSERT(spa_state(spa) == POOL_STATE_UNINITIALIZED);
886 ASSERT3U(zfs_refcount_count(&spa->spa_refcount), ==, 0);
887 ASSERT0(spa->spa_waiters);
888
889 nvlist_free(spa->spa_config_splitting);
890
891 avl_remove(&spa_namespace_avl, spa);
892
893 if (spa->spa_root)
894 spa_strfree(spa->spa_root);
895
896 if (spa->spa_load_name)
897 spa_strfree(spa->spa_load_name);
898
899 while ((dp = list_remove_head(&spa->spa_config_list)) != NULL) {
900 if (dp->scd_path != NULL)
901 spa_strfree(dp->scd_path);
902 kmem_free(dp, sizeof (spa_config_dirent_t));
903 }
904
905 if (spa->spa_alloc_count > 1) {
906 mutex_destroy(&spa->spa_allocs_use->sau_lock);
907 kmem_free(spa->spa_allocs_use, offsetof(spa_allocs_use_t,
908 sau_inuse[spa->spa_alloc_count]));
909 }
910
911 avl_destroy(&spa->spa_metaslabs_by_flushed);
912 avl_destroy(&spa->spa_sm_logs_by_txg);
913 list_destroy(&spa->spa_log_summary);
914 list_destroy(&spa->spa_config_list);
915 list_destroy(&spa->spa_leaf_list);
916
917 nvlist_free(spa->spa_label_features);
918 nvlist_free(spa->spa_load_info);
919 nvlist_free(spa->spa_feat_stats);
920 spa_config_set(spa, NULL);
921
922 zfs_refcount_destroy(&spa->spa_refcount);
923
924 spa_stats_destroy(spa);
925 spa_config_lock_destroy(spa);
926
927 for (int t = 0; t < TXG_SIZE; t++)
928 bplist_destroy(&spa->spa_free_bplist[t]);
929
930 zio_checksum_templates_free(spa);
931
932 cv_destroy(&spa->spa_async_cv);
933 cv_destroy(&spa->spa_evicting_os_cv);
934 cv_destroy(&spa->spa_proc_cv);
935 cv_destroy(&spa->spa_scrub_io_cv);
936 cv_destroy(&spa->spa_suspend_cv);
937 cv_destroy(&spa->spa_activities_cv);
938 cv_destroy(&spa->spa_waiters_cv);
939
940 mutex_destroy(&spa->spa_flushed_ms_lock);
941 mutex_destroy(&spa->spa_async_lock);
942 mutex_destroy(&spa->spa_errlist_lock);
943 mutex_destroy(&spa->spa_errlog_lock);
944 mutex_destroy(&spa->spa_evicting_os_lock);
945 mutex_destroy(&spa->spa_history_lock);
946 mutex_destroy(&spa->spa_proc_lock);
947 mutex_destroy(&spa->spa_props_lock);
948 mutex_destroy(&spa->spa_cksum_tmpls_lock);
949 mutex_destroy(&spa->spa_scrub_lock);
950 mutex_destroy(&spa->spa_suspend_lock);
951 mutex_destroy(&spa->spa_vdev_top_lock);
952 mutex_destroy(&spa->spa_feat_stats_lock);
953 mutex_destroy(&spa->spa_activities_lock);
954 mutex_destroy(&spa->spa_txg_log_time_lock);
955 mutex_destroy(&spa->spa_condense_stats_lock);
956
957 kmem_free(spa, sizeof (spa_t));
958 }
959
960 /*
961 * Given a pool, return the next pool in the namespace, or NULL if there is
962 * none. If 'prev' is NULL, return the first pool.
963 */
964 spa_t *
spa_next(spa_t * prev)965 spa_next(spa_t *prev)
966 {
967 ASSERT(spa_namespace_held());
968
969 if (prev)
970 return (AVL_NEXT(&spa_namespace_avl, prev));
971 else
972 return (avl_first(&spa_namespace_avl));
973 }
974
975 /*
976 * ==========================================================================
977 * SPA refcount functions
978 * ==========================================================================
979 */
980
981 /*
982 * Add a reference to the given spa_t. Must have at least one reference, or
983 * have the namespace lock held.
984 */
985 void
spa_open_ref(spa_t * spa,const void * tag)986 spa_open_ref(spa_t *spa, const void *tag)
987 {
988 ASSERT(zfs_refcount_count(&spa->spa_refcount) >= spa->spa_minref ||
989 spa_namespace_held() ||
990 spa->spa_load_thread == curthread);
991 (void) zfs_refcount_add(&spa->spa_refcount, tag);
992 }
993
994 /*
995 * Remove a reference to the given spa_t. Must have at least one reference, or
996 * have the namespace lock held or be part of a pool import/export.
997 */
998 void
spa_close(spa_t * spa,const void * tag)999 spa_close(spa_t *spa, const void *tag)
1000 {
1001 ASSERT(zfs_refcount_count(&spa->spa_refcount) > spa->spa_minref ||
1002 spa_namespace_held() ||
1003 spa->spa_load_thread == curthread ||
1004 spa->spa_export_thread == curthread);
1005 (void) zfs_refcount_remove(&spa->spa_refcount, tag);
1006 }
1007
1008 /*
1009 * Remove a reference to the given spa_t held by a dsl dir that is
1010 * being asynchronously released. Async releases occur from a taskq
1011 * performing eviction of dsl datasets and dirs. The namespace lock
1012 * isn't held and the hold by the object being evicted may contribute to
1013 * spa_minref (e.g. dataset or directory released during pool export),
1014 * so the asserts in spa_close() do not apply.
1015 */
1016 void
spa_async_close(spa_t * spa,const void * tag)1017 spa_async_close(spa_t *spa, const void *tag)
1018 {
1019 (void) zfs_refcount_remove(&spa->spa_refcount, tag);
1020 }
1021
1022 /*
1023 * Check to see if the spa refcount is zero. Must be called with
1024 * spa_namespace_lock held or be the spa export thread. We really
1025 * compare against spa_minref, which is the number of references
1026 * acquired when opening a pool
1027 */
1028 boolean_t
spa_refcount_zero(spa_t * spa)1029 spa_refcount_zero(spa_t *spa)
1030 {
1031 ASSERT(spa_namespace_held() ||
1032 spa->spa_export_thread == curthread);
1033
1034 return (zfs_refcount_count(&spa->spa_refcount) == spa->spa_minref);
1035 }
1036
1037 /*
1038 * ==========================================================================
1039 * SPA spare and l2cache tracking
1040 * ==========================================================================
1041 */
1042
1043 /*
1044 * Hot spares and cache devices are tracked using the same code below,
1045 * for 'auxiliary' devices.
1046 */
1047
1048 typedef struct spa_aux {
1049 uint64_t aux_guid;
1050 uint64_t aux_pool;
1051 avl_node_t aux_avl;
1052 int aux_count;
1053 } spa_aux_t;
1054
1055 static inline int
spa_aux_compare(const void * a,const void * b)1056 spa_aux_compare(const void *a, const void *b)
1057 {
1058 const spa_aux_t *sa = (const spa_aux_t *)a;
1059 const spa_aux_t *sb = (const spa_aux_t *)b;
1060
1061 return (TREE_CMP(sa->aux_guid, sb->aux_guid));
1062 }
1063
1064 static void
spa_aux_add(vdev_t * vd,avl_tree_t * avl)1065 spa_aux_add(vdev_t *vd, avl_tree_t *avl)
1066 {
1067 avl_index_t where;
1068 spa_aux_t search;
1069 spa_aux_t *aux;
1070
1071 search.aux_guid = vd->vdev_guid;
1072 if ((aux = avl_find(avl, &search, &where)) != NULL) {
1073 aux->aux_count++;
1074 } else {
1075 aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP);
1076 aux->aux_guid = vd->vdev_guid;
1077 aux->aux_count = 1;
1078 avl_insert(avl, aux, where);
1079 }
1080 }
1081
1082 static void
spa_aux_remove(vdev_t * vd,avl_tree_t * avl)1083 spa_aux_remove(vdev_t *vd, avl_tree_t *avl)
1084 {
1085 spa_aux_t search;
1086 spa_aux_t *aux;
1087 avl_index_t where;
1088
1089 search.aux_guid = vd->vdev_guid;
1090 aux = avl_find(avl, &search, &where);
1091
1092 ASSERT(aux != NULL);
1093
1094 if (--aux->aux_count == 0) {
1095 avl_remove(avl, aux);
1096 kmem_free(aux, sizeof (spa_aux_t));
1097 } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) {
1098 aux->aux_pool = 0ULL;
1099 }
1100 }
1101
1102 static boolean_t
spa_aux_exists(uint64_t guid,uint64_t * pool,int * refcnt,avl_tree_t * avl)1103 spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl)
1104 {
1105 spa_aux_t search, *found;
1106
1107 search.aux_guid = guid;
1108 found = avl_find(avl, &search, NULL);
1109
1110 if (pool) {
1111 if (found)
1112 *pool = found->aux_pool;
1113 else
1114 *pool = 0ULL;
1115 }
1116
1117 if (refcnt) {
1118 if (found)
1119 *refcnt = found->aux_count;
1120 else
1121 *refcnt = 0;
1122 }
1123
1124 return (found != NULL);
1125 }
1126
1127 static void
spa_aux_activate(vdev_t * vd,avl_tree_t * avl)1128 spa_aux_activate(vdev_t *vd, avl_tree_t *avl)
1129 {
1130 spa_aux_t search, *found;
1131 avl_index_t where;
1132
1133 search.aux_guid = vd->vdev_guid;
1134 found = avl_find(avl, &search, &where);
1135 ASSERT(found != NULL);
1136 ASSERT(found->aux_pool == 0ULL);
1137
1138 found->aux_pool = spa_guid(vd->vdev_spa);
1139 }
1140
1141 /*
1142 * Spares are tracked globally due to the following constraints:
1143 *
1144 * - A spare may be part of multiple pools.
1145 * - A spare may be added to a pool even if it's actively in use within
1146 * another pool.
1147 * - A spare in use in any pool can only be the source of a replacement if
1148 * the target is a spare in the same pool.
1149 *
1150 * We keep track of all spares on the system through the use of a reference
1151 * counted AVL tree. When a vdev is added as a spare, or used as a replacement
1152 * spare, then we bump the reference count in the AVL tree. In addition, we set
1153 * the 'vdev_isspare' member to indicate that the device is a spare (active or
1154 * inactive). When a spare is made active (used to replace a device in the
1155 * pool), we also keep track of which pool its been made a part of.
1156 *
1157 * The 'spa_spare_lock' protects the AVL tree. These functions are normally
1158 * called under the spa_namespace lock as part of vdev reconfiguration. The
1159 * separate spare lock exists for the status query path, which does not need to
1160 * be completely consistent with respect to other vdev configuration changes.
1161 */
1162
1163 static int
spa_spare_compare(const void * a,const void * b)1164 spa_spare_compare(const void *a, const void *b)
1165 {
1166 return (spa_aux_compare(a, b));
1167 }
1168
1169 void
spa_spare_add(vdev_t * vd)1170 spa_spare_add(vdev_t *vd)
1171 {
1172 mutex_enter(&spa_spare_lock);
1173 ASSERT(!vd->vdev_isspare);
1174 spa_aux_add(vd, &spa_spare_avl);
1175 vd->vdev_isspare = B_TRUE;
1176 mutex_exit(&spa_spare_lock);
1177 }
1178
1179 void
spa_spare_remove(vdev_t * vd)1180 spa_spare_remove(vdev_t *vd)
1181 {
1182 mutex_enter(&spa_spare_lock);
1183 ASSERT(vd->vdev_isspare);
1184 spa_aux_remove(vd, &spa_spare_avl);
1185 vd->vdev_isspare = B_FALSE;
1186 mutex_exit(&spa_spare_lock);
1187 }
1188
1189 boolean_t
spa_spare_exists(uint64_t guid,uint64_t * pool,int * refcnt)1190 spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt)
1191 {
1192 boolean_t found;
1193
1194 mutex_enter(&spa_spare_lock);
1195 found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl);
1196 mutex_exit(&spa_spare_lock);
1197
1198 return (found);
1199 }
1200
1201 void
spa_spare_activate(vdev_t * vd)1202 spa_spare_activate(vdev_t *vd)
1203 {
1204 mutex_enter(&spa_spare_lock);
1205 ASSERT(vd->vdev_isspare);
1206 spa_aux_activate(vd, &spa_spare_avl);
1207 mutex_exit(&spa_spare_lock);
1208 }
1209
1210 /*
1211 * Level 2 ARC devices are tracked globally for the same reasons as spares.
1212 * Cache devices currently only support one pool per cache device, and so
1213 * for these devices the aux reference count is currently unused beyond 1.
1214 */
1215
1216 static int
spa_l2cache_compare(const void * a,const void * b)1217 spa_l2cache_compare(const void *a, const void *b)
1218 {
1219 return (spa_aux_compare(a, b));
1220 }
1221
1222 void
spa_l2cache_add(vdev_t * vd)1223 spa_l2cache_add(vdev_t *vd)
1224 {
1225 mutex_enter(&spa_l2cache_lock);
1226 ASSERT(!vd->vdev_isl2cache);
1227 spa_aux_add(vd, &spa_l2cache_avl);
1228 vd->vdev_isl2cache = B_TRUE;
1229 mutex_exit(&spa_l2cache_lock);
1230 }
1231
1232 void
spa_l2cache_remove(vdev_t * vd)1233 spa_l2cache_remove(vdev_t *vd)
1234 {
1235 mutex_enter(&spa_l2cache_lock);
1236 ASSERT(vd->vdev_isl2cache);
1237 spa_aux_remove(vd, &spa_l2cache_avl);
1238 vd->vdev_isl2cache = B_FALSE;
1239 mutex_exit(&spa_l2cache_lock);
1240 }
1241
1242 boolean_t
spa_l2cache_exists(uint64_t guid,uint64_t * pool)1243 spa_l2cache_exists(uint64_t guid, uint64_t *pool)
1244 {
1245 boolean_t found;
1246
1247 mutex_enter(&spa_l2cache_lock);
1248 found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl);
1249 mutex_exit(&spa_l2cache_lock);
1250
1251 return (found);
1252 }
1253
1254 void
spa_l2cache_activate(vdev_t * vd)1255 spa_l2cache_activate(vdev_t *vd)
1256 {
1257 mutex_enter(&spa_l2cache_lock);
1258 ASSERT(vd->vdev_isl2cache);
1259 spa_aux_activate(vd, &spa_l2cache_avl);
1260 mutex_exit(&spa_l2cache_lock);
1261 }
1262
1263 /*
1264 * ==========================================================================
1265 * SPA vdev locking
1266 * ==========================================================================
1267 */
1268
1269 /*
1270 * Lock the given spa_t for the purpose of adding or removing a vdev.
1271 * Grabs the global spa_namespace_lock plus the spa config lock for writing.
1272 * It returns the next transaction group for the spa_t.
1273 */
1274 uint64_t
spa_vdev_enter(spa_t * spa)1275 spa_vdev_enter(spa_t *spa)
1276 {
1277 mutex_enter(&spa->spa_vdev_top_lock);
1278 spa_namespace_enter(FTAG);
1279
1280 ASSERT0P(spa->spa_export_thread);
1281
1282 vdev_autotrim_stop_all(spa);
1283
1284 return (spa_vdev_config_enter(spa));
1285 }
1286
1287 /*
1288 * The same as spa_vdev_enter() above but additionally takes the guid of
1289 * the vdev being detached. When there is a rebuild in process it will be
1290 * suspended while the vdev tree is modified then resumed by spa_vdev_exit().
1291 * The rebuild is canceled if only a single child remains after the detach.
1292 */
1293 uint64_t
spa_vdev_detach_enter(spa_t * spa,uint64_t guid)1294 spa_vdev_detach_enter(spa_t *spa, uint64_t guid)
1295 {
1296 mutex_enter(&spa->spa_vdev_top_lock);
1297 spa_namespace_enter(FTAG);
1298
1299 ASSERT0P(spa->spa_export_thread);
1300
1301 vdev_autotrim_stop_all(spa);
1302
1303 if (guid != 0) {
1304 vdev_t *vd = spa_lookup_by_guid(spa, guid, B_FALSE);
1305 if (vd) {
1306 vdev_rebuild_stop_wait(vd->vdev_top);
1307 }
1308 }
1309
1310 return (spa_vdev_config_enter(spa));
1311 }
1312
1313 /*
1314 * Internal implementation for spa_vdev_enter(). Used when a vdev
1315 * operation requires multiple syncs (i.e. removing a device) while
1316 * keeping the spa_namespace_lock held.
1317 */
1318 uint64_t
spa_vdev_config_enter(spa_t * spa)1319 spa_vdev_config_enter(spa_t *spa)
1320 {
1321 ASSERT(spa_namespace_held());
1322
1323 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
1324
1325 return (spa_last_synced_txg(spa) + 1);
1326 }
1327
1328 /*
1329 * Used in combination with spa_vdev_config_enter() to allow the syncing
1330 * of multiple transactions without releasing the spa_namespace_lock.
1331 */
1332 void
spa_vdev_config_exit(spa_t * spa,vdev_t * vd,uint64_t txg,int error,const char * tag)1333 spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error,
1334 const char *tag)
1335 {
1336 ASSERT(spa_namespace_held());
1337
1338 int config_changed = B_FALSE;
1339
1340 ASSERT(txg > spa_last_synced_txg(spa));
1341
1342 spa->spa_pending_vdev = NULL;
1343
1344 /*
1345 * Reassess the DTLs.
1346 */
1347 vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE, B_FALSE);
1348
1349 if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) {
1350 config_changed = B_TRUE;
1351 spa->spa_config_generation++;
1352 }
1353
1354 /*
1355 * Verify the metaslab classes.
1356 */
1357 metaslab_class_validate(spa_normal_class(spa));
1358 metaslab_class_validate(spa_log_class(spa));
1359 metaslab_class_validate(spa_embedded_log_class(spa));
1360 metaslab_class_validate(spa_special_class(spa));
1361 metaslab_class_validate(spa_special_embedded_log_class(spa));
1362 metaslab_class_validate(spa_dedup_class(spa));
1363
1364 spa_config_exit(spa, SCL_ALL, spa);
1365
1366 /*
1367 * Panic the system if the specified tag requires it. This
1368 * is useful for ensuring that configurations are updated
1369 * transactionally.
1370 */
1371 if (zio_injection_enabled)
1372 zio_handle_panic_injection(spa, tag, 0);
1373
1374 /*
1375 * Note: this txg_wait_synced() is important because it ensures
1376 * that there won't be more than one config change per txg.
1377 * This allows us to use the txg as the generation number.
1378 */
1379 if (error == 0)
1380 txg_wait_synced(spa->spa_dsl_pool, txg);
1381
1382 if (vd != NULL) {
1383 ASSERT(!vd->vdev_detached || vd->vdev_dtl_sm == NULL);
1384 if (vd->vdev_ops->vdev_op_leaf) {
1385 mutex_enter(&vd->vdev_initialize_lock);
1386 vdev_initialize_stop(vd, VDEV_INITIALIZE_CANCELED,
1387 NULL);
1388 mutex_exit(&vd->vdev_initialize_lock);
1389
1390 mutex_enter(&vd->vdev_trim_lock);
1391 vdev_trim_stop(vd, VDEV_TRIM_CANCELED, NULL);
1392 mutex_exit(&vd->vdev_trim_lock);
1393 }
1394
1395 /*
1396 * The vdev may be both a leaf and top-level device.
1397 */
1398 vdev_autotrim_stop_wait(vd);
1399
1400 spa_config_enter(spa, SCL_STATE_ALL, spa, RW_WRITER);
1401 vdev_free(vd);
1402 spa_config_exit(spa, SCL_STATE_ALL, spa);
1403 }
1404
1405 /*
1406 * If the config changed, update the config cache.
1407 */
1408 if (config_changed)
1409 spa_write_cachefile(spa, B_FALSE, B_TRUE, B_TRUE);
1410 }
1411
1412 /*
1413 * Unlock the spa_t after adding or removing a vdev. Besides undoing the
1414 * locking of spa_vdev_enter(), we also want make sure the transactions have
1415 * synced to disk, and then update the global configuration cache with the new
1416 * information.
1417 */
1418 int
spa_vdev_exit(spa_t * spa,vdev_t * vd,uint64_t txg,int error)1419 spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error)
1420 {
1421 vdev_autotrim_restart(spa);
1422 vdev_rebuild_restart(spa);
1423
1424 spa_vdev_config_exit(spa, vd, txg, error, FTAG);
1425 spa_namespace_exit(FTAG);
1426 mutex_exit(&spa->spa_vdev_top_lock);
1427
1428 return (error);
1429 }
1430
1431 /*
1432 * Lock the given spa_t for the purpose of changing vdev state.
1433 */
1434 void
spa_vdev_state_enter(spa_t * spa,int oplocks)1435 spa_vdev_state_enter(spa_t *spa, int oplocks)
1436 {
1437 int locks = SCL_STATE_ALL | oplocks;
1438
1439 /*
1440 * Root pools may need to read of the underlying devfs filesystem
1441 * when opening up a vdev. Unfortunately if we're holding the
1442 * SCL_ZIO lock it will result in a deadlock when we try to issue
1443 * the read from the root filesystem. Instead we "prefetch"
1444 * the associated vnodes that we need prior to opening the
1445 * underlying devices and cache them so that we can prevent
1446 * any I/O when we are doing the actual open.
1447 */
1448 if (spa_is_root(spa)) {
1449 int low = locks & ~(SCL_ZIO - 1);
1450 int high = locks & ~low;
1451
1452 spa_config_enter(spa, high, spa, RW_WRITER);
1453 vdev_hold(spa->spa_root_vdev);
1454 spa_config_enter(spa, low, spa, RW_WRITER);
1455 } else {
1456 spa_config_enter(spa, locks, spa, RW_WRITER);
1457 }
1458 spa->spa_vdev_locks = locks;
1459 }
1460
1461 int
spa_vdev_state_exit(spa_t * spa,vdev_t * vd,int error)1462 spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error)
1463 {
1464 boolean_t config_changed = B_FALSE;
1465 vdev_t *vdev_top;
1466
1467 if (vd == NULL || vd == spa->spa_root_vdev) {
1468 vdev_top = spa->spa_root_vdev;
1469 } else {
1470 vdev_top = vd->vdev_top;
1471 }
1472
1473 if (vd != NULL || error == 0)
1474 vdev_dtl_reassess(vdev_top, 0, 0, B_FALSE, B_FALSE);
1475
1476 if (vd != NULL) {
1477 if (vd != spa->spa_root_vdev)
1478 vdev_state_dirty(vdev_top);
1479
1480 config_changed = B_TRUE;
1481 spa->spa_config_generation++;
1482 }
1483
1484 if (spa_is_root(spa))
1485 vdev_rele(spa->spa_root_vdev);
1486
1487 ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL);
1488 spa_config_exit(spa, spa->spa_vdev_locks, spa);
1489
1490 /*
1491 * If anything changed, wait for it to sync. This ensures that,
1492 * from the system administrator's perspective, zpool(8) commands
1493 * are synchronous. This is important for things like zpool offline:
1494 * when the command completes, you expect no further I/O from ZFS.
1495 */
1496 if (vd != NULL)
1497 txg_wait_synced(spa->spa_dsl_pool, 0);
1498
1499 /*
1500 * If the config changed, update the config cache.
1501 */
1502 if (config_changed) {
1503 spa_namespace_enter(FTAG);
1504 spa_write_cachefile(spa, B_FALSE, B_TRUE, B_FALSE);
1505 spa_namespace_exit(FTAG);
1506 }
1507
1508 return (error);
1509 }
1510
1511 /*
1512 * ==========================================================================
1513 * Miscellaneous functions
1514 * ==========================================================================
1515 */
1516
1517 void
spa_activate_mos_feature(spa_t * spa,const char * feature,dmu_tx_t * tx)1518 spa_activate_mos_feature(spa_t *spa, const char *feature, dmu_tx_t *tx)
1519 {
1520 if (!nvlist_exists(spa->spa_label_features, feature)) {
1521 fnvlist_add_boolean(spa->spa_label_features, feature);
1522 /*
1523 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't
1524 * dirty the vdev config because lock SCL_CONFIG is not held.
1525 * Thankfully, in this case we don't need to dirty the config
1526 * because it will be written out anyway when we finish
1527 * creating the pool.
1528 */
1529 if (tx->tx_txg != TXG_INITIAL)
1530 vdev_config_dirty(spa->spa_root_vdev);
1531 }
1532 }
1533
1534 void
spa_deactivate_mos_feature(spa_t * spa,const char * feature)1535 spa_deactivate_mos_feature(spa_t *spa, const char *feature)
1536 {
1537 if (nvlist_remove_all(spa->spa_label_features, feature) == 0)
1538 vdev_config_dirty(spa->spa_root_vdev);
1539 }
1540
1541 /*
1542 * Return the spa_t associated with given pool_guid, if it exists. If
1543 * device_guid is non-zero, determine whether the pool exists *and* contains
1544 * a device with the specified device_guid.
1545 */
1546 spa_t *
spa_by_guid(uint64_t pool_guid,uint64_t device_guid)1547 spa_by_guid(uint64_t pool_guid, uint64_t device_guid)
1548 {
1549 spa_t *spa;
1550 avl_tree_t *t = &spa_namespace_avl;
1551
1552 ASSERT(spa_namespace_held());
1553
1554 for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) {
1555 if (spa->spa_state == POOL_STATE_UNINITIALIZED)
1556 continue;
1557 if (spa->spa_root_vdev == NULL)
1558 continue;
1559 if (spa_guid(spa) == pool_guid) {
1560 if (device_guid == 0)
1561 break;
1562
1563 if (vdev_lookup_by_guid(spa->spa_root_vdev,
1564 device_guid) != NULL)
1565 break;
1566
1567 /*
1568 * Check any devices we may be in the process of adding.
1569 */
1570 if (spa->spa_pending_vdev) {
1571 if (vdev_lookup_by_guid(spa->spa_pending_vdev,
1572 device_guid) != NULL)
1573 break;
1574 }
1575 }
1576 }
1577
1578 return (spa);
1579 }
1580
1581 /*
1582 * Determine whether a pool with the given pool_guid exists.
1583 */
1584 boolean_t
spa_guid_exists(uint64_t pool_guid,uint64_t device_guid)1585 spa_guid_exists(uint64_t pool_guid, uint64_t device_guid)
1586 {
1587 return (spa_by_guid(pool_guid, device_guid) != NULL);
1588 }
1589
1590 char *
spa_strdup(const char * s)1591 spa_strdup(const char *s)
1592 {
1593 size_t len;
1594 char *new;
1595
1596 len = strlen(s);
1597 new = kmem_alloc(len + 1, KM_SLEEP);
1598 memcpy(new, s, len + 1);
1599
1600 return (new);
1601 }
1602
1603 void
spa_strfree(char * s)1604 spa_strfree(char *s)
1605 {
1606 kmem_free(s, strlen(s) + 1);
1607 }
1608
1609 uint64_t
spa_generate_guid(spa_t * spa)1610 spa_generate_guid(spa_t *spa)
1611 {
1612 uint64_t guid;
1613
1614 if (spa != NULL) {
1615 do {
1616 (void) random_get_pseudo_bytes((void *)&guid,
1617 sizeof (guid));
1618 } while (guid == 0 || spa_guid_exists(spa_guid(spa), guid));
1619 } else {
1620 do {
1621 (void) random_get_pseudo_bytes((void *)&guid,
1622 sizeof (guid));
1623 } while (guid == 0 || spa_guid_exists(guid, 0));
1624 }
1625
1626 return (guid);
1627 }
1628
1629 static boolean_t
spa_load_guid_exists(uint64_t guid)1630 spa_load_guid_exists(uint64_t guid)
1631 {
1632 avl_tree_t *t = &spa_namespace_avl;
1633
1634 ASSERT(spa_namespace_held());
1635
1636 for (spa_t *spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) {
1637 if (spa_load_guid(spa) == guid)
1638 return (B_TRUE);
1639 }
1640
1641 return (arc_async_flush_guid_inuse(guid));
1642 }
1643
1644 uint64_t
spa_generate_load_guid(void)1645 spa_generate_load_guid(void)
1646 {
1647 uint64_t guid;
1648
1649 do {
1650 (void) random_get_pseudo_bytes((void *)&guid,
1651 sizeof (guid));
1652 } while (guid == 0 || spa_load_guid_exists(guid));
1653
1654 return (guid);
1655 }
1656
1657 void
snprintf_blkptr(char * buf,size_t buflen,const blkptr_t * bp)1658 snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp)
1659 {
1660 char type[256];
1661 const char *checksum = NULL;
1662 const char *compress = NULL;
1663
1664 if (bp != NULL) {
1665 if (BP_GET_TYPE(bp) & DMU_OT_NEWTYPE) {
1666 dmu_object_byteswap_t bswap =
1667 DMU_OT_BYTESWAP(BP_GET_TYPE(bp));
1668 (void) snprintf(type, sizeof (type), "bswap %s %s",
1669 DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) ?
1670 "metadata" : "data",
1671 dmu_ot_byteswap[bswap].ob_name);
1672 } else {
1673 (void) strlcpy(type, dmu_ot[BP_GET_TYPE(bp)].ot_name,
1674 sizeof (type));
1675 }
1676 if (!BP_IS_EMBEDDED(bp)) {
1677 checksum =
1678 zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name;
1679 }
1680 compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name;
1681 }
1682
1683 SNPRINTF_BLKPTR(kmem_scnprintf, ' ', buf, buflen, bp, type, checksum,
1684 compress);
1685 }
1686
1687 void
spa_freeze(spa_t * spa)1688 spa_freeze(spa_t *spa)
1689 {
1690 uint64_t freeze_txg = 0;
1691
1692 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1693 if (spa->spa_freeze_txg == UINT64_MAX) {
1694 freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE;
1695 spa->spa_freeze_txg = freeze_txg;
1696 }
1697 spa_config_exit(spa, SCL_ALL, FTAG);
1698 if (freeze_txg != 0)
1699 txg_wait_synced(spa_get_dsl(spa), freeze_txg);
1700 }
1701
1702 void
zfs_panic_recover(const char * fmt,...)1703 zfs_panic_recover(const char *fmt, ...)
1704 {
1705 va_list adx;
1706
1707 va_start(adx, fmt);
1708 vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
1709 va_end(adx);
1710 }
1711
1712 /*
1713 * This is a stripped-down version of strtoull, suitable only for converting
1714 * lowercase hexadecimal numbers that don't overflow.
1715 */
1716 uint64_t
zfs_strtonum(const char * str,char ** nptr)1717 zfs_strtonum(const char *str, char **nptr)
1718 {
1719 uint64_t val = 0;
1720 char c;
1721 int digit;
1722
1723 while ((c = *str) != '\0') {
1724 if (c >= '0' && c <= '9')
1725 digit = c - '0';
1726 else if (c >= 'a' && c <= 'f')
1727 digit = 10 + c - 'a';
1728 else
1729 break;
1730
1731 val *= 16;
1732 val += digit;
1733
1734 str++;
1735 }
1736
1737 if (nptr)
1738 *nptr = (char *)str;
1739
1740 return (val);
1741 }
1742
1743 void
spa_activate_allocation_classes(spa_t * spa,dmu_tx_t * tx)1744 spa_activate_allocation_classes(spa_t *spa, dmu_tx_t *tx)
1745 {
1746 /*
1747 * We bump the feature refcount for each special vdev added to the pool
1748 */
1749 ASSERT(spa_feature_is_enabled(spa, SPA_FEATURE_ALLOCATION_CLASSES));
1750 spa_feature_incr(spa, SPA_FEATURE_ALLOCATION_CLASSES, tx);
1751 }
1752
1753 /*
1754 * ==========================================================================
1755 * Accessor functions
1756 * ==========================================================================
1757 */
1758
1759 boolean_t
spa_shutting_down(spa_t * spa)1760 spa_shutting_down(spa_t *spa)
1761 {
1762 return (spa->spa_async_suspended);
1763 }
1764
1765 dsl_pool_t *
spa_get_dsl(spa_t * spa)1766 spa_get_dsl(spa_t *spa)
1767 {
1768 return (spa->spa_dsl_pool);
1769 }
1770
1771 boolean_t
spa_is_initializing(spa_t * spa)1772 spa_is_initializing(spa_t *spa)
1773 {
1774 return (spa->spa_is_initializing);
1775 }
1776
1777 boolean_t
spa_indirect_vdevs_loaded(spa_t * spa)1778 spa_indirect_vdevs_loaded(spa_t *spa)
1779 {
1780 return (spa->spa_indirect_vdevs_loaded);
1781 }
1782
1783 blkptr_t *
spa_get_rootblkptr(spa_t * spa)1784 spa_get_rootblkptr(spa_t *spa)
1785 {
1786 return (&spa->spa_ubsync.ub_rootbp);
1787 }
1788
1789 void
spa_set_rootblkptr(spa_t * spa,const blkptr_t * bp)1790 spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp)
1791 {
1792 spa->spa_uberblock.ub_rootbp = *bp;
1793 }
1794
1795 void
spa_altroot(spa_t * spa,char * buf,size_t buflen)1796 spa_altroot(spa_t *spa, char *buf, size_t buflen)
1797 {
1798 if (spa->spa_root == NULL)
1799 buf[0] = '\0';
1800 else
1801 (void) strlcpy(buf, spa->spa_root, buflen);
1802 }
1803
1804 uint32_t
spa_sync_pass(spa_t * spa)1805 spa_sync_pass(spa_t *spa)
1806 {
1807 return (spa->spa_sync_pass);
1808 }
1809
1810 char *
spa_name(spa_t * spa)1811 spa_name(spa_t *spa)
1812 {
1813 return (spa->spa_name);
1814 }
1815
1816 char *
spa_load_name(spa_t * spa)1817 spa_load_name(spa_t *spa)
1818 {
1819 /*
1820 * During spa_tryimport() the pool name includes a unique prefix.
1821 * Returns the original name which can be used for log messages.
1822 */
1823 if (spa->spa_load_name)
1824 return (spa->spa_load_name);
1825
1826 return (spa->spa_name);
1827 }
1828
1829 uint64_t
spa_guid(spa_t * spa)1830 spa_guid(spa_t *spa)
1831 {
1832 dsl_pool_t *dp = spa_get_dsl(spa);
1833 uint64_t guid;
1834
1835 /*
1836 * If we fail to parse the config during spa_load(), we can go through
1837 * the error path (which posts an ereport) and end up here with no root
1838 * vdev. We stash the original pool guid in 'spa_config_guid' to handle
1839 * this case.
1840 */
1841 if (spa->spa_root_vdev == NULL)
1842 return (spa->spa_config_guid);
1843
1844 guid = spa->spa_last_synced_guid != 0 ?
1845 spa->spa_last_synced_guid : spa->spa_root_vdev->vdev_guid;
1846
1847 /*
1848 * Return the most recently synced out guid unless we're
1849 * in syncing context.
1850 */
1851 if (dp && dsl_pool_sync_context(dp))
1852 return (spa->spa_root_vdev->vdev_guid);
1853 else
1854 return (guid);
1855 }
1856
1857 uint64_t
spa_load_guid(spa_t * spa)1858 spa_load_guid(spa_t *spa)
1859 {
1860 /*
1861 * This is a GUID that exists solely as a reference for the
1862 * purposes of the arc. It is generated at load time, and
1863 * is never written to persistent storage.
1864 */
1865 return (spa->spa_load_guid);
1866 }
1867
1868 uint64_t
spa_last_synced_txg(spa_t * spa)1869 spa_last_synced_txg(spa_t *spa)
1870 {
1871 return (spa->spa_ubsync.ub_txg);
1872 }
1873
1874 uint64_t
spa_first_txg(spa_t * spa)1875 spa_first_txg(spa_t *spa)
1876 {
1877 return (spa->spa_first_txg);
1878 }
1879
1880 uint64_t
spa_syncing_txg(spa_t * spa)1881 spa_syncing_txg(spa_t *spa)
1882 {
1883 return (spa->spa_syncing_txg);
1884 }
1885
1886 uint64_t
spa_open_txg(spa_t * spa)1887 spa_open_txg(spa_t *spa)
1888 {
1889 return (spa->spa_dsl_pool->dp_tx.tx_open_txg);
1890 }
1891
1892 /*
1893 * Return the last txg where data can be dirtied. The final txgs
1894 * will be used to just clear out any deferred frees that remain.
1895 */
1896 uint64_t
spa_final_dirty_txg(spa_t * spa)1897 spa_final_dirty_txg(spa_t *spa)
1898 {
1899 return (spa->spa_final_txg - TXG_DEFER_SIZE);
1900 }
1901
1902 pool_state_t
spa_state(spa_t * spa)1903 spa_state(spa_t *spa)
1904 {
1905 return (spa->spa_state);
1906 }
1907
1908 spa_load_state_t
spa_load_state(spa_t * spa)1909 spa_load_state(spa_t *spa)
1910 {
1911 return (spa->spa_load_state);
1912 }
1913
1914 uint64_t
spa_freeze_txg(spa_t * spa)1915 spa_freeze_txg(spa_t *spa)
1916 {
1917 return (spa->spa_freeze_txg);
1918 }
1919
1920 /*
1921 * Return the inflated asize for a logical write in bytes. This is used by the
1922 * DMU to calculate the space a logical write will require on disk.
1923 * If lsize is smaller than the largest physical block size allocatable on this
1924 * pool we use its value instead, since the write will end up using the whole
1925 * block anyway.
1926 */
1927 uint64_t
spa_get_worst_case_asize(spa_t * spa,uint64_t lsize)1928 spa_get_worst_case_asize(spa_t *spa, uint64_t lsize)
1929 {
1930 if (lsize == 0)
1931 return (0); /* No inflation needed */
1932 return (MAX(lsize, 1 << spa->spa_max_ashift) * spa_asize_inflation);
1933 }
1934
1935 /*
1936 * Return the range of minimum allocation sizes for the normal allocation
1937 * class. This can be used by external consumers of the DMU to estimate
1938 * potential wasted capacity when setting the recordsize for an object.
1939 * This is mainly for dRAID pools which always pad to a full stripe width.
1940 */
1941 void
spa_get_min_alloc_range(spa_t * spa,uint64_t * min_alloc,uint64_t * max_alloc)1942 spa_get_min_alloc_range(spa_t *spa, uint64_t *min_alloc, uint64_t *max_alloc)
1943 {
1944 *min_alloc = spa->spa_min_alloc;
1945 *max_alloc = spa->spa_max_alloc;
1946 }
1947
1948 /*
1949 * Return the amount of slop space in bytes. It is typically 1/32 of the pool
1950 * (3.2%), minus the embedded log space. On very small pools, it may be
1951 * slightly larger than this. On very large pools, it will be capped to
1952 * the value of spa_max_slop. The embedded log space is not included in
1953 * spa_dspace. By subtracting it, the usable space (per "zfs list") is a
1954 * constant 97% of the total space, regardless of metaslab size (assuming the
1955 * default spa_slop_shift=5 and a non-tiny pool).
1956 *
1957 * See the comment above spa_slop_shift for more details.
1958 */
1959 uint64_t
spa_get_slop_space(spa_t * spa)1960 spa_get_slop_space(spa_t *spa)
1961 {
1962 uint64_t space = 0;
1963 uint64_t slop = 0;
1964
1965 /*
1966 * Make sure spa_dedup_dspace has been set.
1967 */
1968 if (spa->spa_dedup_dspace == ~0ULL)
1969 spa_update_dspace(spa);
1970
1971 space = spa->spa_rdspace;
1972 slop = MIN(space >> spa_slop_shift, spa_max_slop);
1973
1974 /*
1975 * Subtract the embedded log space, but no more than half the (3.2%)
1976 * unusable space. Note, the "no more than half" is only relevant if
1977 * zfs_embedded_slog_min_ms >> spa_slop_shift < 2, which is not true by
1978 * default.
1979 */
1980 uint64_t embedded_log =
1981 metaslab_class_get_dspace(spa_embedded_log_class(spa));
1982 embedded_log += metaslab_class_get_dspace(
1983 spa_special_embedded_log_class(spa));
1984 slop -= MIN(embedded_log, slop >> 1);
1985
1986 /*
1987 * Slop space should be at least spa_min_slop, but no more than half
1988 * the entire pool.
1989 */
1990 slop = MAX(slop, MIN(space >> 1, spa_min_slop));
1991 return (slop);
1992 }
1993
1994 uint64_t
spa_get_dspace(spa_t * spa)1995 spa_get_dspace(spa_t *spa)
1996 {
1997 return (spa->spa_dspace);
1998 }
1999
2000 uint64_t
spa_get_checkpoint_space(spa_t * spa)2001 spa_get_checkpoint_space(spa_t *spa)
2002 {
2003 return (spa->spa_checkpoint_info.sci_dspace);
2004 }
2005
2006 void
spa_update_dspace(spa_t * spa)2007 spa_update_dspace(spa_t *spa)
2008 {
2009 spa->spa_rdspace = metaslab_class_get_dspace(spa_normal_class(spa));
2010 if (spa->spa_nonallocating_dspace > 0) {
2011 /*
2012 * Subtract the space provided by all non-allocating vdevs that
2013 * contribute to dspace. If a file is overwritten, its old
2014 * blocks are freed and new blocks are allocated. If there are
2015 * no snapshots of the file, the available space should remain
2016 * the same. The old blocks could be freed from the
2017 * non-allocating vdev, but the new blocks must be allocated on
2018 * other (allocating) vdevs. By reserving the entire size of
2019 * the non-allocating vdevs (including allocated space), we
2020 * ensure that there will be enough space on the allocating
2021 * vdevs for this file overwrite to succeed.
2022 *
2023 * Note that the DMU/DSL doesn't actually know or care
2024 * how much space is allocated (it does its own tracking
2025 * of how much space has been logically used). So it
2026 * doesn't matter that the data we are moving may be
2027 * allocated twice (on the old device and the new device).
2028 */
2029 ASSERT3U(spa->spa_rdspace, >=, spa->spa_nonallocating_dspace);
2030 spa->spa_rdspace -= spa->spa_nonallocating_dspace;
2031 }
2032 spa->spa_dspace = spa->spa_rdspace +
2033 metaslab_class_get_dalloc(spa_special_class(spa)) +
2034 metaslab_class_get_dalloc(spa_dedup_class(spa)) +
2035 ddt_get_dedup_dspace(spa) +
2036 brt_get_dspace(spa);
2037 }
2038
2039 /*
2040 * Return the failure mode that has been set to this pool. The default
2041 * behavior will be to block all I/Os when a complete failure occurs.
2042 */
2043 uint64_t
spa_get_failmode(spa_t * spa)2044 spa_get_failmode(spa_t *spa)
2045 {
2046 return (spa->spa_failmode);
2047 }
2048
2049 boolean_t
spa_suspended(spa_t * spa)2050 spa_suspended(spa_t *spa)
2051 {
2052 return (spa->spa_suspended != ZIO_SUSPEND_NONE);
2053 }
2054
2055 uint64_t
spa_version(spa_t * spa)2056 spa_version(spa_t *spa)
2057 {
2058 return (spa->spa_ubsync.ub_version);
2059 }
2060
2061 boolean_t
spa_deflate(spa_t * spa)2062 spa_deflate(spa_t *spa)
2063 {
2064 return (spa->spa_deflate);
2065 }
2066
2067 metaslab_class_t *
spa_normal_class(spa_t * spa)2068 spa_normal_class(spa_t *spa)
2069 {
2070 return (spa->spa_normal_class);
2071 }
2072
2073 metaslab_class_t *
spa_log_class(spa_t * spa)2074 spa_log_class(spa_t *spa)
2075 {
2076 return (spa->spa_log_class);
2077 }
2078
2079 metaslab_class_t *
spa_embedded_log_class(spa_t * spa)2080 spa_embedded_log_class(spa_t *spa)
2081 {
2082 return (spa->spa_embedded_log_class);
2083 }
2084
2085 metaslab_class_t *
spa_special_class(spa_t * spa)2086 spa_special_class(spa_t *spa)
2087 {
2088 return (spa->spa_special_class);
2089 }
2090
2091 metaslab_class_t *
spa_special_embedded_log_class(spa_t * spa)2092 spa_special_embedded_log_class(spa_t *spa)
2093 {
2094 return (spa->spa_special_embedded_log_class);
2095 }
2096
2097 metaslab_class_t *
spa_dedup_class(spa_t * spa)2098 spa_dedup_class(spa_t *spa)
2099 {
2100 return (spa->spa_dedup_class);
2101 }
2102
2103 boolean_t
spa_special_has_ddt(spa_t * spa)2104 spa_special_has_ddt(spa_t *spa)
2105 {
2106 return (zfs_ddt_data_is_special && spa_has_special(spa));
2107 }
2108
2109 /*
2110 * Locate an appropriate allocation class
2111 */
2112 metaslab_class_t *
spa_preferred_class(spa_t * spa,const zio_t * zio)2113 spa_preferred_class(spa_t *spa, const zio_t *zio)
2114 {
2115 metaslab_class_t *mc = zio->io_metaslab_class;
2116 boolean_t tried_dedup = (mc == spa_dedup_class(spa));
2117 boolean_t tried_special = (mc == spa_special_class(spa));
2118 const zio_prop_t *zp = &zio->io_prop;
2119
2120 /* Gang children should always use the class of their parents. */
2121 if (zio->io_flags & ZIO_FLAG_GANG_CHILD) {
2122 ASSERT(mc != NULL);
2123 return (mc);
2124 }
2125
2126 /*
2127 * Override object type for the purposes of selecting a storage class.
2128 * Primarily for DMU_OTN_ types where we can't explicitly control their
2129 * storage class; instead, choose a static type most closely matches
2130 * what we want.
2131 */
2132 dmu_object_type_t objtype =
2133 zp->zp_storage_type == DMU_OT_NONE ?
2134 zp->zp_type : zp->zp_storage_type;
2135
2136 /*
2137 * ZIL allocations determine their class in zio_alloc_zil().
2138 */
2139 ASSERT(objtype != DMU_OT_INTENT_LOG);
2140
2141 if (DMU_OT_IS_DDT(objtype)) {
2142 if (spa_has_dedup(spa) && !tried_dedup && !tried_special)
2143 return (spa_dedup_class(spa));
2144 else if (spa_special_has_ddt(spa) && !tried_special)
2145 return (spa_special_class(spa));
2146 else
2147 return (spa_normal_class(spa));
2148 }
2149
2150 if (!spa_has_special(spa) || tried_special)
2151 return (spa_normal_class(spa));
2152
2153 if (DMU_OT_IS_METADATA(objtype) ||
2154 (zfs_user_indirect_is_special && zp->zp_level > 0))
2155 return (spa_special_class(spa));
2156
2157 /*
2158 * Allow small blocks in special class. However, leave a reserve of
2159 * zfs_special_class_metadata_reserve_pct exclusively for metadata.
2160 */
2161 if (zio->io_size <= zp->zp_zpl_smallblk) {
2162 metaslab_class_t *special = spa_special_class(spa);
2163 uint64_t limit = metaslab_class_get_space(special) *
2164 (100 - zfs_special_class_metadata_reserve_pct) / 100;
2165
2166 if (metaslab_class_get_alloc(special) < limit)
2167 return (special);
2168 }
2169
2170 return (spa_normal_class(spa));
2171 }
2172
2173 void
spa_evicting_os_register(spa_t * spa,objset_t * os)2174 spa_evicting_os_register(spa_t *spa, objset_t *os)
2175 {
2176 mutex_enter(&spa->spa_evicting_os_lock);
2177 list_insert_head(&spa->spa_evicting_os_list, os);
2178 mutex_exit(&spa->spa_evicting_os_lock);
2179 }
2180
2181 void
spa_evicting_os_deregister(spa_t * spa,objset_t * os)2182 spa_evicting_os_deregister(spa_t *spa, objset_t *os)
2183 {
2184 mutex_enter(&spa->spa_evicting_os_lock);
2185 list_remove(&spa->spa_evicting_os_list, os);
2186 cv_broadcast(&spa->spa_evicting_os_cv);
2187 mutex_exit(&spa->spa_evicting_os_lock);
2188 }
2189
2190 void
spa_evicting_os_wait(spa_t * spa)2191 spa_evicting_os_wait(spa_t *spa)
2192 {
2193 mutex_enter(&spa->spa_evicting_os_lock);
2194 while (!list_is_empty(&spa->spa_evicting_os_list))
2195 cv_wait(&spa->spa_evicting_os_cv, &spa->spa_evicting_os_lock);
2196 mutex_exit(&spa->spa_evicting_os_lock);
2197
2198 dmu_buf_user_evict_wait();
2199 }
2200
2201 int
spa_max_replication(spa_t * spa)2202 spa_max_replication(spa_t *spa)
2203 {
2204 /*
2205 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
2206 * handle BPs with more than one DVA allocated. Set our max
2207 * replication level accordingly.
2208 */
2209 if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS)
2210 return (1);
2211 return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override));
2212 }
2213
2214 int
spa_prev_software_version(spa_t * spa)2215 spa_prev_software_version(spa_t *spa)
2216 {
2217 return (spa->spa_prev_software_version);
2218 }
2219
2220 uint64_t
spa_deadman_synctime(spa_t * spa)2221 spa_deadman_synctime(spa_t *spa)
2222 {
2223 return (spa->spa_deadman_synctime);
2224 }
2225
2226 spa_autotrim_t
spa_get_autotrim(spa_t * spa)2227 spa_get_autotrim(spa_t *spa)
2228 {
2229 return (spa->spa_autotrim);
2230 }
2231
2232 uint64_t
spa_deadman_ziotime(spa_t * spa)2233 spa_deadman_ziotime(spa_t *spa)
2234 {
2235 return (spa->spa_deadman_ziotime);
2236 }
2237
2238 uint64_t
spa_get_deadman_failmode(spa_t * spa)2239 spa_get_deadman_failmode(spa_t *spa)
2240 {
2241 return (spa->spa_deadman_failmode);
2242 }
2243
2244 void
spa_set_deadman_failmode(spa_t * spa,const char * failmode)2245 spa_set_deadman_failmode(spa_t *spa, const char *failmode)
2246 {
2247 if (strcmp(failmode, "wait") == 0)
2248 spa->spa_deadman_failmode = ZIO_FAILURE_MODE_WAIT;
2249 else if (strcmp(failmode, "continue") == 0)
2250 spa->spa_deadman_failmode = ZIO_FAILURE_MODE_CONTINUE;
2251 else if (strcmp(failmode, "panic") == 0)
2252 spa->spa_deadman_failmode = ZIO_FAILURE_MODE_PANIC;
2253 else
2254 spa->spa_deadman_failmode = ZIO_FAILURE_MODE_WAIT;
2255 }
2256
2257 void
spa_set_deadman_ziotime(hrtime_t ns)2258 spa_set_deadman_ziotime(hrtime_t ns)
2259 {
2260 spa_t *spa = NULL;
2261
2262 if (spa_mode_global != SPA_MODE_UNINIT) {
2263 spa_namespace_enter(FTAG);
2264 while ((spa = spa_next(spa)) != NULL)
2265 spa->spa_deadman_ziotime = ns;
2266 spa_namespace_exit(FTAG);
2267 }
2268 }
2269
2270 void
spa_set_deadman_synctime(hrtime_t ns)2271 spa_set_deadman_synctime(hrtime_t ns)
2272 {
2273 spa_t *spa = NULL;
2274
2275 if (spa_mode_global != SPA_MODE_UNINIT) {
2276 spa_namespace_enter(FTAG);
2277 while ((spa = spa_next(spa)) != NULL)
2278 spa->spa_deadman_synctime = ns;
2279 spa_namespace_exit(FTAG);
2280 }
2281 }
2282
2283 uint64_t
dva_get_dsize_sync(spa_t * spa,const dva_t * dva)2284 dva_get_dsize_sync(spa_t *spa, const dva_t *dva)
2285 {
2286 uint64_t asize = DVA_GET_ASIZE(dva);
2287 uint64_t dsize = asize;
2288
2289 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
2290
2291 if (asize != 0 && spa->spa_deflate) {
2292 vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));
2293 if (vd != NULL)
2294 dsize = (asize >> SPA_MINBLOCKSHIFT) *
2295 vd->vdev_deflate_ratio;
2296 }
2297
2298 return (dsize);
2299 }
2300
2301 uint64_t
bp_get_dsize_sync(spa_t * spa,const blkptr_t * bp)2302 bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp)
2303 {
2304 uint64_t dsize = 0;
2305
2306 for (int d = 0; d < BP_GET_NDVAS(bp); d++)
2307 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
2308
2309 return (dsize);
2310 }
2311
2312 uint64_t
bp_get_dsize(spa_t * spa,const blkptr_t * bp)2313 bp_get_dsize(spa_t *spa, const blkptr_t *bp)
2314 {
2315 uint64_t dsize = 0;
2316
2317 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
2318
2319 for (int d = 0; d < BP_GET_NDVAS(bp); d++)
2320 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
2321
2322 spa_config_exit(spa, SCL_VDEV, FTAG);
2323
2324 return (dsize);
2325 }
2326
2327 uint64_t
spa_dirty_data(spa_t * spa)2328 spa_dirty_data(spa_t *spa)
2329 {
2330 return (spa->spa_dsl_pool->dp_dirty_total);
2331 }
2332
2333 /*
2334 * ==========================================================================
2335 * SPA Import Progress Routines
2336 * ==========================================================================
2337 */
2338
2339 typedef struct spa_import_progress {
2340 uint64_t pool_guid; /* unique id for updates */
2341 char *pool_name;
2342 spa_load_state_t spa_load_state;
2343 char *spa_load_notes;
2344 uint64_t mmp_sec_remaining; /* MMP activity check */
2345 uint64_t spa_load_max_txg; /* rewind txg */
2346 procfs_list_node_t smh_node;
2347 } spa_import_progress_t;
2348
2349 spa_history_list_t *spa_import_progress_list = NULL;
2350
2351 static int
spa_import_progress_show_header(struct seq_file * f)2352 spa_import_progress_show_header(struct seq_file *f)
2353 {
2354 seq_printf(f, "%-20s %-14s %-14s %-12s %-16s %s\n", "pool_guid",
2355 "load_state", "multihost_secs", "max_txg",
2356 "pool_name", "notes");
2357 return (0);
2358 }
2359
2360 static int
spa_import_progress_show(struct seq_file * f,void * data)2361 spa_import_progress_show(struct seq_file *f, void *data)
2362 {
2363 spa_import_progress_t *sip = (spa_import_progress_t *)data;
2364
2365 seq_printf(f, "%-20llu %-14llu %-14llu %-12llu %-16s %s\n",
2366 (u_longlong_t)sip->pool_guid, (u_longlong_t)sip->spa_load_state,
2367 (u_longlong_t)sip->mmp_sec_remaining,
2368 (u_longlong_t)sip->spa_load_max_txg,
2369 (sip->pool_name ? sip->pool_name : "-"),
2370 (sip->spa_load_notes ? sip->spa_load_notes : "-"));
2371
2372 return (0);
2373 }
2374
2375 /* Remove oldest elements from list until there are no more than 'size' left */
2376 static void
spa_import_progress_truncate(spa_history_list_t * shl,unsigned int size)2377 spa_import_progress_truncate(spa_history_list_t *shl, unsigned int size)
2378 {
2379 spa_import_progress_t *sip;
2380 while (shl->size > size) {
2381 sip = list_remove_head(&shl->procfs_list.pl_list);
2382 if (sip->pool_name)
2383 spa_strfree(sip->pool_name);
2384 if (sip->spa_load_notes)
2385 kmem_strfree(sip->spa_load_notes);
2386 kmem_free(sip, sizeof (spa_import_progress_t));
2387 shl->size--;
2388 }
2389
2390 IMPLY(size == 0, list_is_empty(&shl->procfs_list.pl_list));
2391 }
2392
2393 static void
spa_import_progress_init(void)2394 spa_import_progress_init(void)
2395 {
2396 spa_import_progress_list = kmem_zalloc(sizeof (spa_history_list_t),
2397 KM_SLEEP);
2398
2399 spa_import_progress_list->size = 0;
2400
2401 spa_import_progress_list->procfs_list.pl_private =
2402 spa_import_progress_list;
2403
2404 procfs_list_install("zfs",
2405 NULL,
2406 "import_progress",
2407 0644,
2408 &spa_import_progress_list->procfs_list,
2409 spa_import_progress_show,
2410 spa_import_progress_show_header,
2411 NULL,
2412 offsetof(spa_import_progress_t, smh_node));
2413 }
2414
2415 static void
spa_import_progress_destroy(void)2416 spa_import_progress_destroy(void)
2417 {
2418 spa_history_list_t *shl = spa_import_progress_list;
2419 procfs_list_uninstall(&shl->procfs_list);
2420 spa_import_progress_truncate(shl, 0);
2421 procfs_list_destroy(&shl->procfs_list);
2422 kmem_free(shl, sizeof (spa_history_list_t));
2423 }
2424
2425 int
spa_import_progress_set_state(uint64_t pool_guid,spa_load_state_t load_state)2426 spa_import_progress_set_state(uint64_t pool_guid,
2427 spa_load_state_t load_state)
2428 {
2429 spa_history_list_t *shl = spa_import_progress_list;
2430 spa_import_progress_t *sip;
2431 int error = ENOENT;
2432
2433 if (shl->size == 0)
2434 return (0);
2435
2436 mutex_enter(&shl->procfs_list.pl_lock);
2437 for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
2438 sip = list_prev(&shl->procfs_list.pl_list, sip)) {
2439 if (sip->pool_guid == pool_guid) {
2440 sip->spa_load_state = load_state;
2441 if (sip->spa_load_notes != NULL) {
2442 kmem_strfree(sip->spa_load_notes);
2443 sip->spa_load_notes = NULL;
2444 }
2445 error = 0;
2446 break;
2447 }
2448 }
2449 mutex_exit(&shl->procfs_list.pl_lock);
2450
2451 return (error);
2452 }
2453
2454 static void
spa_import_progress_set_notes_impl(spa_t * spa,boolean_t log_dbgmsg,const char * fmt,va_list adx)2455 spa_import_progress_set_notes_impl(spa_t *spa, boolean_t log_dbgmsg,
2456 const char *fmt, va_list adx)
2457 {
2458 spa_history_list_t *shl = spa_import_progress_list;
2459 spa_import_progress_t *sip;
2460 uint64_t pool_guid = spa_guid(spa);
2461
2462 if (shl->size == 0)
2463 return;
2464
2465 char *notes = kmem_vasprintf(fmt, adx);
2466
2467 mutex_enter(&shl->procfs_list.pl_lock);
2468 for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
2469 sip = list_prev(&shl->procfs_list.pl_list, sip)) {
2470 if (sip->pool_guid == pool_guid) {
2471 if (sip->spa_load_notes != NULL) {
2472 kmem_strfree(sip->spa_load_notes);
2473 sip->spa_load_notes = NULL;
2474 }
2475 sip->spa_load_notes = notes;
2476 if (log_dbgmsg)
2477 zfs_dbgmsg("'%s' %s", sip->pool_name, notes);
2478 notes = NULL;
2479 break;
2480 }
2481 }
2482 mutex_exit(&shl->procfs_list.pl_lock);
2483 if (notes != NULL)
2484 kmem_strfree(notes);
2485 }
2486
2487 void
spa_import_progress_set_notes(spa_t * spa,const char * fmt,...)2488 spa_import_progress_set_notes(spa_t *spa, const char *fmt, ...)
2489 {
2490 va_list adx;
2491
2492 va_start(adx, fmt);
2493 spa_import_progress_set_notes_impl(spa, B_TRUE, fmt, adx);
2494 va_end(adx);
2495 }
2496
2497 void
spa_import_progress_set_notes_nolog(spa_t * spa,const char * fmt,...)2498 spa_import_progress_set_notes_nolog(spa_t *spa, const char *fmt, ...)
2499 {
2500 va_list adx;
2501
2502 va_start(adx, fmt);
2503 spa_import_progress_set_notes_impl(spa, B_FALSE, fmt, adx);
2504 va_end(adx);
2505 }
2506
2507 int
spa_import_progress_set_max_txg(uint64_t pool_guid,uint64_t load_max_txg)2508 spa_import_progress_set_max_txg(uint64_t pool_guid, uint64_t load_max_txg)
2509 {
2510 spa_history_list_t *shl = spa_import_progress_list;
2511 spa_import_progress_t *sip;
2512 int error = ENOENT;
2513
2514 if (shl->size == 0)
2515 return (0);
2516
2517 mutex_enter(&shl->procfs_list.pl_lock);
2518 for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
2519 sip = list_prev(&shl->procfs_list.pl_list, sip)) {
2520 if (sip->pool_guid == pool_guid) {
2521 sip->spa_load_max_txg = load_max_txg;
2522 error = 0;
2523 break;
2524 }
2525 }
2526 mutex_exit(&shl->procfs_list.pl_lock);
2527
2528 return (error);
2529 }
2530
2531 int
spa_import_progress_set_mmp_check(uint64_t pool_guid,uint64_t mmp_sec_remaining)2532 spa_import_progress_set_mmp_check(uint64_t pool_guid,
2533 uint64_t mmp_sec_remaining)
2534 {
2535 spa_history_list_t *shl = spa_import_progress_list;
2536 spa_import_progress_t *sip;
2537 int error = ENOENT;
2538
2539 if (shl->size == 0)
2540 return (0);
2541
2542 mutex_enter(&shl->procfs_list.pl_lock);
2543 for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
2544 sip = list_prev(&shl->procfs_list.pl_list, sip)) {
2545 if (sip->pool_guid == pool_guid) {
2546 sip->mmp_sec_remaining = mmp_sec_remaining;
2547 error = 0;
2548 break;
2549 }
2550 }
2551 mutex_exit(&shl->procfs_list.pl_lock);
2552
2553 return (error);
2554 }
2555
2556 /*
2557 * A new import is in progress, add an entry.
2558 */
2559 void
spa_import_progress_add(spa_t * spa)2560 spa_import_progress_add(spa_t *spa)
2561 {
2562 spa_history_list_t *shl = spa_import_progress_list;
2563 spa_import_progress_t *sip;
2564 const char *poolname = NULL;
2565
2566 sip = kmem_zalloc(sizeof (spa_import_progress_t), KM_SLEEP);
2567 sip->pool_guid = spa_guid(spa);
2568
2569 (void) nvlist_lookup_string(spa->spa_config, ZPOOL_CONFIG_POOL_NAME,
2570 &poolname);
2571 if (poolname == NULL)
2572 poolname = spa_name(spa);
2573 sip->pool_name = spa_strdup(poolname);
2574 sip->spa_load_state = spa_load_state(spa);
2575 sip->spa_load_notes = NULL;
2576
2577 mutex_enter(&shl->procfs_list.pl_lock);
2578 procfs_list_add(&shl->procfs_list, sip);
2579 shl->size++;
2580 mutex_exit(&shl->procfs_list.pl_lock);
2581 }
2582
2583 void
spa_import_progress_remove(uint64_t pool_guid)2584 spa_import_progress_remove(uint64_t pool_guid)
2585 {
2586 spa_history_list_t *shl = spa_import_progress_list;
2587 spa_import_progress_t *sip;
2588
2589 mutex_enter(&shl->procfs_list.pl_lock);
2590 for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
2591 sip = list_prev(&shl->procfs_list.pl_list, sip)) {
2592 if (sip->pool_guid == pool_guid) {
2593 if (sip->pool_name)
2594 spa_strfree(sip->pool_name);
2595 if (sip->spa_load_notes)
2596 spa_strfree(sip->spa_load_notes);
2597 list_remove(&shl->procfs_list.pl_list, sip);
2598 shl->size--;
2599 kmem_free(sip, sizeof (spa_import_progress_t));
2600 break;
2601 }
2602 }
2603 mutex_exit(&shl->procfs_list.pl_lock);
2604 }
2605
2606 /*
2607 * ==========================================================================
2608 * Initialization and Termination
2609 * ==========================================================================
2610 */
2611
2612 static int
spa_name_compare(const void * a1,const void * a2)2613 spa_name_compare(const void *a1, const void *a2)
2614 {
2615 const spa_t *s1 = a1;
2616 const spa_t *s2 = a2;
2617
2618 return (TREE_ISIGN(strcmp(s1->spa_name, s2->spa_name)));
2619 }
2620
2621 void
spa_init(spa_mode_t mode)2622 spa_init(spa_mode_t mode)
2623 {
2624 mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL);
2625 mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL);
2626 mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL);
2627 cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL);
2628
2629 avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t),
2630 offsetof(spa_t, spa_avl));
2631
2632 avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t),
2633 offsetof(spa_aux_t, aux_avl));
2634
2635 avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t),
2636 offsetof(spa_aux_t, aux_avl));
2637
2638 spa_mode_global = mode;
2639
2640 #ifndef _KERNEL
2641 if (spa_mode_global != SPA_MODE_READ && dprintf_find_string("watch")) {
2642 struct sigaction sa;
2643
2644 sa.sa_flags = SA_SIGINFO;
2645 sigemptyset(&sa.sa_mask);
2646 sa.sa_sigaction = arc_buf_sigsegv;
2647
2648 if (sigaction(SIGSEGV, &sa, NULL) == -1) {
2649 perror("could not enable watchpoints: "
2650 "sigaction(SIGSEGV, ...) = ");
2651 } else {
2652 arc_watch = B_TRUE;
2653 }
2654 }
2655 #endif
2656
2657 fm_init();
2658 zfs_refcount_init();
2659 unique_init();
2660 zfs_btree_init();
2661 metaslab_stat_init();
2662 brt_init();
2663 ddt_init();
2664 zio_init();
2665 dmu_init();
2666 zil_init();
2667 vdev_mirror_stat_init();
2668 vdev_raidz_math_init();
2669 vdev_file_init();
2670 zfs_prop_init();
2671 chksum_init();
2672 zpool_prop_init();
2673 zpool_feature_init();
2674 vdev_prop_init();
2675 scan_init();
2676 qat_init();
2677 spa_import_progress_init();
2678 zap_init();
2679 }
2680
2681 void
spa_fini(void)2682 spa_fini(void)
2683 {
2684 spa_evict_all();
2685
2686 vdev_file_fini();
2687 vdev_mirror_stat_fini();
2688 vdev_raidz_math_fini();
2689 chksum_fini();
2690 zil_fini();
2691 dmu_fini();
2692 zio_fini();
2693 ddt_fini();
2694 brt_fini();
2695 metaslab_stat_fini();
2696 zfs_btree_fini();
2697 unique_fini();
2698 zfs_refcount_fini();
2699 fm_fini();
2700 scan_fini();
2701 qat_fini();
2702 spa_import_progress_destroy();
2703 zap_fini();
2704
2705 avl_destroy(&spa_namespace_avl);
2706 avl_destroy(&spa_spare_avl);
2707 avl_destroy(&spa_l2cache_avl);
2708
2709 cv_destroy(&spa_namespace_cv);
2710 mutex_destroy(&spa_namespace_lock);
2711 mutex_destroy(&spa_spare_lock);
2712 mutex_destroy(&spa_l2cache_lock);
2713 }
2714
2715 boolean_t
spa_has_dedup(spa_t * spa)2716 spa_has_dedup(spa_t *spa)
2717 {
2718 return (spa->spa_dedup_class->mc_groups != 0);
2719 }
2720
2721 /*
2722 * Return whether this pool has a dedicated slog device. No locking needed.
2723 * It's not a problem if the wrong answer is returned as it's only for
2724 * performance and not correctness.
2725 */
2726 boolean_t
spa_has_slogs(spa_t * spa)2727 spa_has_slogs(spa_t *spa)
2728 {
2729 return (spa->spa_log_class->mc_groups != 0);
2730 }
2731
2732 boolean_t
spa_has_special(spa_t * spa)2733 spa_has_special(spa_t *spa)
2734 {
2735 return (spa->spa_special_class->mc_groups != 0);
2736 }
2737
2738 spa_log_state_t
spa_get_log_state(spa_t * spa)2739 spa_get_log_state(spa_t *spa)
2740 {
2741 return (spa->spa_log_state);
2742 }
2743
2744 void
spa_set_log_state(spa_t * spa,spa_log_state_t state)2745 spa_set_log_state(spa_t *spa, spa_log_state_t state)
2746 {
2747 spa->spa_log_state = state;
2748 }
2749
2750 boolean_t
spa_is_root(spa_t * spa)2751 spa_is_root(spa_t *spa)
2752 {
2753 return (spa->spa_is_root);
2754 }
2755
2756 boolean_t
spa_writeable(spa_t * spa)2757 spa_writeable(spa_t *spa)
2758 {
2759 return (!!(spa->spa_mode & SPA_MODE_WRITE) && spa->spa_trust_config);
2760 }
2761
2762 /*
2763 * Returns true if there is a pending sync task in any of the current
2764 * syncing txg, the current quiescing txg, or the current open txg.
2765 */
2766 boolean_t
spa_has_pending_synctask(spa_t * spa)2767 spa_has_pending_synctask(spa_t *spa)
2768 {
2769 return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks) ||
2770 !txg_all_lists_empty(&spa->spa_dsl_pool->dp_early_sync_tasks));
2771 }
2772
2773 spa_mode_t
spa_mode(spa_t * spa)2774 spa_mode(spa_t *spa)
2775 {
2776 return (spa->spa_mode);
2777 }
2778
2779 uint64_t
spa_get_last_scrubbed_txg(spa_t * spa)2780 spa_get_last_scrubbed_txg(spa_t *spa)
2781 {
2782 return (spa->spa_scrubbed_last_txg);
2783 }
2784
2785 uint64_t
spa_bootfs(spa_t * spa)2786 spa_bootfs(spa_t *spa)
2787 {
2788 return (spa->spa_bootfs);
2789 }
2790
2791 uint64_t
spa_delegation(spa_t * spa)2792 spa_delegation(spa_t *spa)
2793 {
2794 return (spa->spa_delegation);
2795 }
2796
2797 objset_t *
spa_meta_objset(spa_t * spa)2798 spa_meta_objset(spa_t *spa)
2799 {
2800 return (spa->spa_meta_objset);
2801 }
2802
2803 enum zio_checksum
spa_dedup_checksum(spa_t * spa)2804 spa_dedup_checksum(spa_t *spa)
2805 {
2806 return (spa->spa_dedup_checksum);
2807 }
2808
2809 /*
2810 * Reset pool scan stat per scan pass (or reboot).
2811 */
2812 void
spa_scan_stat_init(spa_t * spa)2813 spa_scan_stat_init(spa_t *spa)
2814 {
2815 /* data not stored on disk */
2816 spa->spa_scan_pass_start = gethrestime_sec();
2817 if (dsl_scan_is_paused_scrub(spa->spa_dsl_pool->dp_scan))
2818 spa->spa_scan_pass_scrub_pause = spa->spa_scan_pass_start;
2819 else
2820 spa->spa_scan_pass_scrub_pause = 0;
2821
2822 if (dsl_errorscrub_is_paused(spa->spa_dsl_pool->dp_scan))
2823 spa->spa_scan_pass_errorscrub_pause = spa->spa_scan_pass_start;
2824 else
2825 spa->spa_scan_pass_errorscrub_pause = 0;
2826
2827 spa->spa_scan_pass_scrub_spent_paused = 0;
2828 spa->spa_scan_pass_exam = 0;
2829 spa->spa_scan_pass_issued = 0;
2830
2831 // error scrub stats
2832 spa->spa_scan_pass_errorscrub_spent_paused = 0;
2833 }
2834
2835 /*
2836 * Get scan stats for zpool status reports
2837 */
2838 int
spa_scan_get_stats(spa_t * spa,pool_scan_stat_t * ps)2839 spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps)
2840 {
2841 dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL;
2842
2843 if (scn == NULL || (scn->scn_phys.scn_func == POOL_SCAN_NONE &&
2844 scn->errorscrub_phys.dep_func == POOL_SCAN_NONE))
2845 return (SET_ERROR(ENOENT));
2846
2847 memset(ps, 0, sizeof (pool_scan_stat_t));
2848
2849 /* data stored on disk */
2850 ps->pss_func = scn->scn_phys.scn_func;
2851 ps->pss_state = scn->scn_phys.scn_state;
2852 ps->pss_start_time = scn->scn_phys.scn_start_time;
2853 ps->pss_end_time = scn->scn_phys.scn_end_time;
2854 ps->pss_to_examine = scn->scn_phys.scn_to_examine;
2855 ps->pss_examined = scn->scn_phys.scn_examined;
2856 ps->pss_skipped = scn->scn_phys.scn_skipped;
2857 ps->pss_processed = scn->scn_phys.scn_processed;
2858 ps->pss_errors = scn->scn_phys.scn_errors;
2859
2860 /* data not stored on disk */
2861 ps->pss_pass_exam = spa->spa_scan_pass_exam;
2862 ps->pss_pass_start = spa->spa_scan_pass_start;
2863 ps->pss_pass_scrub_pause = spa->spa_scan_pass_scrub_pause;
2864 ps->pss_pass_scrub_spent_paused = spa->spa_scan_pass_scrub_spent_paused;
2865 ps->pss_pass_issued = spa->spa_scan_pass_issued;
2866 ps->pss_issued =
2867 scn->scn_issued_before_pass + spa->spa_scan_pass_issued;
2868
2869 /* error scrub data stored on disk */
2870 ps->pss_error_scrub_func = scn->errorscrub_phys.dep_func;
2871 ps->pss_error_scrub_state = scn->errorscrub_phys.dep_state;
2872 ps->pss_error_scrub_start = scn->errorscrub_phys.dep_start_time;
2873 ps->pss_error_scrub_end = scn->errorscrub_phys.dep_end_time;
2874 ps->pss_error_scrub_examined = scn->errorscrub_phys.dep_examined;
2875 ps->pss_error_scrub_to_be_examined =
2876 scn->errorscrub_phys.dep_to_examine;
2877
2878 /* error scrub data not stored on disk */
2879 ps->pss_pass_error_scrub_pause = spa->spa_scan_pass_errorscrub_pause;
2880 ps->pss_pass_scrub_flags = 0;
2881 if (scn->scn_phys.scn_flags & DSF_SCRUB_THOROUGH)
2882 ps->pss_pass_scrub_flags |= POOL_SCRUB_THOROUGH;
2883
2884 return (0);
2885 }
2886
2887 int
spa_maxblocksize(spa_t * spa)2888 spa_maxblocksize(spa_t *spa)
2889 {
2890 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS))
2891 return (SPA_MAXBLOCKSIZE);
2892 else
2893 return (SPA_OLD_MAXBLOCKSIZE);
2894 }
2895
2896
2897 /*
2898 * Returns the txg that the last device removal completed. No indirect mappings
2899 * have been added since this txg.
2900 */
2901 uint64_t
spa_get_last_removal_txg(spa_t * spa)2902 spa_get_last_removal_txg(spa_t *spa)
2903 {
2904 uint64_t vdevid;
2905 uint64_t ret = -1ULL;
2906
2907 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
2908 /*
2909 * sr_prev_indirect_vdev is only modified while holding all the
2910 * config locks, so it is sufficient to hold SCL_VDEV as reader when
2911 * examining it.
2912 */
2913 vdevid = spa->spa_removing_phys.sr_prev_indirect_vdev;
2914
2915 while (vdevid != -1ULL) {
2916 vdev_t *vd = vdev_lookup_top(spa, vdevid);
2917 vdev_indirect_births_t *vib = vd->vdev_indirect_births;
2918
2919 ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
2920
2921 /*
2922 * If the removal did not remap any data, we don't care.
2923 */
2924 if (vdev_indirect_births_count(vib) != 0) {
2925 ret = vdev_indirect_births_last_entry_txg(vib);
2926 break;
2927 }
2928
2929 vdevid = vd->vdev_indirect_config.vic_prev_indirect_vdev;
2930 }
2931 spa_config_exit(spa, SCL_VDEV, FTAG);
2932
2933 IMPLY(ret != -1ULL,
2934 spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL));
2935
2936 return (ret);
2937 }
2938
2939 int
spa_maxdnodesize(spa_t * spa)2940 spa_maxdnodesize(spa_t *spa)
2941 {
2942 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_DNODE))
2943 return (DNODE_MAX_SIZE);
2944 else
2945 return (DNODE_MIN_SIZE);
2946 }
2947
2948 boolean_t
spa_multihost(spa_t * spa)2949 spa_multihost(spa_t *spa)
2950 {
2951 return (spa->spa_multihost ? B_TRUE : B_FALSE);
2952 }
2953
2954 uint32_t
spa_get_hostid(spa_t * spa)2955 spa_get_hostid(spa_t *spa)
2956 {
2957 return (spa->spa_hostid);
2958 }
2959
2960 boolean_t
spa_trust_config(spa_t * spa)2961 spa_trust_config(spa_t *spa)
2962 {
2963 return (spa->spa_trust_config);
2964 }
2965
2966 uint64_t
spa_missing_tvds_allowed(spa_t * spa)2967 spa_missing_tvds_allowed(spa_t *spa)
2968 {
2969 return (spa->spa_missing_tvds_allowed);
2970 }
2971
2972 space_map_t *
spa_syncing_log_sm(spa_t * spa)2973 spa_syncing_log_sm(spa_t *spa)
2974 {
2975 return (spa->spa_syncing_log_sm);
2976 }
2977
2978 void
spa_set_missing_tvds(spa_t * spa,uint64_t missing)2979 spa_set_missing_tvds(spa_t *spa, uint64_t missing)
2980 {
2981 spa->spa_missing_tvds = missing;
2982 }
2983
2984 /*
2985 * Return the pool state string ("ONLINE", "DEGRADED", "SUSPENDED", etc).
2986 */
2987 const char *
spa_state_to_name(spa_t * spa)2988 spa_state_to_name(spa_t *spa)
2989 {
2990 ASSERT3P(spa, !=, NULL);
2991
2992 /*
2993 * it is possible for the spa to exist, without root vdev
2994 * as the spa transitions during import/export
2995 */
2996 vdev_t *rvd = spa->spa_root_vdev;
2997 if (rvd == NULL) {
2998 return ("TRANSITIONING");
2999 }
3000 vdev_state_t state = rvd->vdev_state;
3001 vdev_aux_t aux = rvd->vdev_stat.vs_aux;
3002
3003 if (spa_suspended(spa))
3004 return ("SUSPENDED");
3005
3006 switch (state) {
3007 case VDEV_STATE_CLOSED:
3008 case VDEV_STATE_OFFLINE:
3009 return ("OFFLINE");
3010 case VDEV_STATE_REMOVED:
3011 return ("REMOVED");
3012 case VDEV_STATE_CANT_OPEN:
3013 if (aux == VDEV_AUX_CORRUPT_DATA || aux == VDEV_AUX_BAD_LOG)
3014 return ("FAULTED");
3015 else if (aux == VDEV_AUX_SPLIT_POOL)
3016 return ("SPLIT");
3017 else
3018 return ("UNAVAIL");
3019 case VDEV_STATE_FAULTED:
3020 return ("FAULTED");
3021 case VDEV_STATE_DEGRADED:
3022 return ("DEGRADED");
3023 case VDEV_STATE_HEALTHY:
3024 return ("ONLINE");
3025 default:
3026 break;
3027 }
3028
3029 return ("UNKNOWN");
3030 }
3031
3032 boolean_t
spa_top_vdevs_spacemap_addressable(spa_t * spa)3033 spa_top_vdevs_spacemap_addressable(spa_t *spa)
3034 {
3035 vdev_t *rvd = spa->spa_root_vdev;
3036 for (uint64_t c = 0; c < rvd->vdev_children; c++) {
3037 if (!vdev_is_spacemap_addressable(rvd->vdev_child[c]))
3038 return (B_FALSE);
3039 }
3040 return (B_TRUE);
3041 }
3042
3043 boolean_t
spa_has_checkpoint(spa_t * spa)3044 spa_has_checkpoint(spa_t *spa)
3045 {
3046 return (spa->spa_checkpoint_txg != 0);
3047 }
3048
3049 boolean_t
spa_importing_readonly_checkpoint(spa_t * spa)3050 spa_importing_readonly_checkpoint(spa_t *spa)
3051 {
3052 return ((spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT) &&
3053 spa->spa_mode == SPA_MODE_READ);
3054 }
3055
3056 uint64_t
spa_min_claim_txg(spa_t * spa)3057 spa_min_claim_txg(spa_t *spa)
3058 {
3059 uint64_t checkpoint_txg = spa->spa_uberblock.ub_checkpoint_txg;
3060
3061 if (checkpoint_txg != 0)
3062 return (checkpoint_txg + 1);
3063
3064 return (spa->spa_first_txg);
3065 }
3066
3067 /*
3068 * If there is a checkpoint, async destroys may consume more space from
3069 * the pool instead of freeing it. In an attempt to save the pool from
3070 * getting suspended when it is about to run out of space, we stop
3071 * processing async destroys.
3072 */
3073 boolean_t
spa_suspend_async_destroy(spa_t * spa)3074 spa_suspend_async_destroy(spa_t *spa)
3075 {
3076 dsl_pool_t *dp = spa_get_dsl(spa);
3077
3078 uint64_t unreserved = dsl_pool_unreserved_space(dp,
3079 ZFS_SPACE_CHECK_EXTRA_RESERVED);
3080 uint64_t used = dsl_dir_phys(dp->dp_root_dir)->dd_used_bytes;
3081 uint64_t avail = (unreserved > used) ? (unreserved - used) : 0;
3082
3083 if (spa_has_checkpoint(spa) && avail == 0)
3084 return (B_TRUE);
3085
3086 return (B_FALSE);
3087 }
3088
3089 #if defined(_KERNEL)
3090
3091 int
param_set_deadman_failmode_common(const char * val)3092 param_set_deadman_failmode_common(const char *val)
3093 {
3094 spa_t *spa = NULL;
3095 char *p;
3096
3097 if (val == NULL)
3098 return (SET_ERROR(EINVAL));
3099
3100 if ((p = strchr(val, '\n')) != NULL)
3101 *p = '\0';
3102
3103 if (strcmp(val, "wait") != 0 && strcmp(val, "continue") != 0 &&
3104 strcmp(val, "panic"))
3105 return (SET_ERROR(EINVAL));
3106
3107 if (spa_mode_global != SPA_MODE_UNINIT) {
3108 spa_namespace_enter(FTAG);
3109 while ((spa = spa_next(spa)) != NULL)
3110 spa_set_deadman_failmode(spa, val);
3111 spa_namespace_exit(FTAG);
3112 }
3113
3114 return (0);
3115 }
3116 #endif
3117
3118 /* Namespace manipulation */
3119 EXPORT_SYMBOL(spa_lookup);
3120 EXPORT_SYMBOL(spa_add);
3121 EXPORT_SYMBOL(spa_remove);
3122 EXPORT_SYMBOL(spa_next);
3123
3124 /* Refcount functions */
3125 EXPORT_SYMBOL(spa_open_ref);
3126 EXPORT_SYMBOL(spa_close);
3127 EXPORT_SYMBOL(spa_refcount_zero);
3128
3129 /* Pool configuration lock */
3130 EXPORT_SYMBOL(spa_config_tryenter);
3131 EXPORT_SYMBOL(spa_config_enter);
3132 EXPORT_SYMBOL(spa_config_exit);
3133 EXPORT_SYMBOL(spa_config_held);
3134
3135 /* Pool vdev add/remove lock */
3136 EXPORT_SYMBOL(spa_vdev_enter);
3137 EXPORT_SYMBOL(spa_vdev_exit);
3138
3139 /* Pool vdev state change lock */
3140 EXPORT_SYMBOL(spa_vdev_state_enter);
3141 EXPORT_SYMBOL(spa_vdev_state_exit);
3142
3143 /* Accessor functions */
3144 EXPORT_SYMBOL(spa_shutting_down);
3145 EXPORT_SYMBOL(spa_get_dsl);
3146 EXPORT_SYMBOL(spa_get_rootblkptr);
3147 EXPORT_SYMBOL(spa_set_rootblkptr);
3148 EXPORT_SYMBOL(spa_altroot);
3149 EXPORT_SYMBOL(spa_sync_pass);
3150 EXPORT_SYMBOL(spa_name);
3151 EXPORT_SYMBOL(spa_load_name);
3152 EXPORT_SYMBOL(spa_guid);
3153 EXPORT_SYMBOL(spa_last_synced_txg);
3154 EXPORT_SYMBOL(spa_first_txg);
3155 EXPORT_SYMBOL(spa_syncing_txg);
3156 EXPORT_SYMBOL(spa_version);
3157 EXPORT_SYMBOL(spa_state);
3158 EXPORT_SYMBOL(spa_load_state);
3159 EXPORT_SYMBOL(spa_freeze_txg);
3160 EXPORT_SYMBOL(spa_get_min_alloc_range); /* for Lustre */
3161 EXPORT_SYMBOL(spa_get_dspace);
3162 EXPORT_SYMBOL(spa_update_dspace);
3163 EXPORT_SYMBOL(spa_deflate);
3164 EXPORT_SYMBOL(spa_normal_class);
3165 EXPORT_SYMBOL(spa_log_class);
3166 EXPORT_SYMBOL(spa_special_class);
3167 EXPORT_SYMBOL(spa_preferred_class);
3168 EXPORT_SYMBOL(spa_max_replication);
3169 EXPORT_SYMBOL(spa_prev_software_version);
3170 EXPORT_SYMBOL(spa_get_failmode);
3171 EXPORT_SYMBOL(spa_suspended);
3172 EXPORT_SYMBOL(spa_bootfs);
3173 EXPORT_SYMBOL(spa_delegation);
3174 EXPORT_SYMBOL(spa_meta_objset);
3175 EXPORT_SYMBOL(spa_maxblocksize);
3176 EXPORT_SYMBOL(spa_maxdnodesize);
3177
3178 /* Miscellaneous support routines */
3179 EXPORT_SYMBOL(spa_guid_exists);
3180 EXPORT_SYMBOL(spa_strdup);
3181 EXPORT_SYMBOL(spa_strfree);
3182 EXPORT_SYMBOL(spa_generate_guid);
3183 EXPORT_SYMBOL(snprintf_blkptr);
3184 EXPORT_SYMBOL(spa_freeze);
3185 EXPORT_SYMBOL(spa_upgrade);
3186 EXPORT_SYMBOL(spa_evict_all);
3187 EXPORT_SYMBOL(spa_lookup_by_guid);
3188 EXPORT_SYMBOL(spa_has_spare);
3189 EXPORT_SYMBOL(dva_get_dsize_sync);
3190 EXPORT_SYMBOL(bp_get_dsize_sync);
3191 EXPORT_SYMBOL(bp_get_dsize);
3192 EXPORT_SYMBOL(spa_has_slogs);
3193 EXPORT_SYMBOL(spa_is_root);
3194 EXPORT_SYMBOL(spa_writeable);
3195 EXPORT_SYMBOL(spa_mode);
3196 EXPORT_SYMBOL(spa_trust_config);
3197 EXPORT_SYMBOL(spa_missing_tvds_allowed);
3198 EXPORT_SYMBOL(spa_set_missing_tvds);
3199 EXPORT_SYMBOL(spa_state_to_name);
3200 EXPORT_SYMBOL(spa_importing_readonly_checkpoint);
3201 EXPORT_SYMBOL(spa_min_claim_txg);
3202 EXPORT_SYMBOL(spa_suspend_async_destroy);
3203 EXPORT_SYMBOL(spa_has_checkpoint);
3204 EXPORT_SYMBOL(spa_top_vdevs_spacemap_addressable);
3205
3206 ZFS_MODULE_PARAM(zfs, zfs_, flags, UINT, ZMOD_RW,
3207 "Set additional debugging flags");
3208
3209 ZFS_MODULE_PARAM(zfs, zfs_, recover, INT, ZMOD_RW,
3210 "Set to attempt to recover from fatal errors");
3211
3212 ZFS_MODULE_PARAM(zfs, zfs_, free_leak_on_eio, INT, ZMOD_RW,
3213 "Set to ignore IO errors during free and permanently leak the space");
3214
3215 ZFS_MODULE_PARAM(zfs_deadman, zfs_deadman_, checktime_ms, U64, ZMOD_RW,
3216 "Dead I/O check interval in milliseconds");
3217
3218 ZFS_MODULE_PARAM(zfs_deadman, zfs_deadman_, enabled, INT, ZMOD_RW,
3219 "Enable deadman timer");
3220
3221 ZFS_MODULE_PARAM(zfs_spa, spa_, asize_inflation, UINT, ZMOD_RW,
3222 "SPA size estimate multiplication factor");
3223
3224 ZFS_MODULE_PARAM(zfs, zfs_, ddt_data_is_special, INT, ZMOD_RW,
3225 "Place DDT data into the special class");
3226
3227 ZFS_MODULE_PARAM(zfs, zfs_, user_indirect_is_special, INT, ZMOD_RW,
3228 "Place user data indirect blocks into the special class");
3229
3230 ZFS_MODULE_PARAM_CALL(zfs_deadman, zfs_deadman_, failmode,
3231 param_set_deadman_failmode, param_get_charp, ZMOD_RW,
3232 "Failmode for deadman timer");
3233
3234 ZFS_MODULE_PARAM_CALL(zfs_deadman, zfs_deadman_, synctime_ms,
3235 param_set_deadman_synctime, spl_param_get_u64, ZMOD_RW,
3236 "Pool sync expiration time in milliseconds");
3237
3238 ZFS_MODULE_PARAM_CALL(zfs_deadman, zfs_deadman_, ziotime_ms,
3239 param_set_deadman_ziotime, spl_param_get_u64, ZMOD_RW,
3240 "IO expiration time in milliseconds");
3241
3242 ZFS_MODULE_PARAM(zfs, zfs_, special_class_metadata_reserve_pct, UINT, ZMOD_RW,
3243 "Small file blocks in special vdevs depends on this much "
3244 "free space available");
3245
3246 ZFS_MODULE_PARAM_CALL(zfs_spa, spa_, slop_shift, param_set_slop_shift,
3247 param_get_uint, ZMOD_RW, "Reserved free space in pool");
3248
3249 ZFS_MODULE_PARAM(zfs, spa_, num_allocators, INT, ZMOD_RW,
3250 "Number of allocators per spa");
3251
3252 ZFS_MODULE_PARAM(zfs, spa_, cpus_per_allocator, INT, ZMOD_RW,
3253 "Minimum number of CPUs per allocators");
3254