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1 | /* | |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | |
23 | * Copyright (c) 2011, 2014 by Delphix. All rights reserved. | |
24 | * Copyright 2011 Nexenta Systems, Inc. All rights reserved. | |
25 | */ | |
26 | ||
27 | #include <sys/zfs_context.h> | |
28 | #include <sys/spa_impl.h> | |
29 | #include <sys/zio.h> | |
30 | #include <sys/zio_checksum.h> | |
31 | #include <sys/zio_compress.h> | |
32 | #include <sys/dmu.h> | |
33 | #include <sys/dmu_tx.h> | |
34 | #include <sys/zap.h> | |
35 | #include <sys/zil.h> | |
36 | #include <sys/vdev_impl.h> | |
37 | #include <sys/vdev_file.h> | |
38 | #include <sys/metaslab.h> | |
39 | #include <sys/uberblock_impl.h> | |
40 | #include <sys/txg.h> | |
41 | #include <sys/avl.h> | |
42 | #include <sys/unique.h> | |
43 | #include <sys/dsl_pool.h> | |
44 | #include <sys/dsl_dir.h> | |
45 | #include <sys/dsl_prop.h> | |
46 | #include <sys/fm/util.h> | |
47 | #include <sys/dsl_scan.h> | |
48 | #include <sys/fs/zfs.h> | |
49 | #include <sys/metaslab_impl.h> | |
50 | #include <sys/arc.h> | |
51 | #include <sys/ddt.h> | |
52 | #include <sys/kstat.h> | |
53 | #include "zfs_prop.h" | |
54 | #include "zfeature_common.h" | |
55 | ||
56 | /* | |
57 | * SPA locking | |
58 | * | |
59 | * There are four basic locks for managing spa_t structures: | |
60 | * | |
61 | * spa_namespace_lock (global mutex) | |
62 | * | |
63 | * This lock must be acquired to do any of the following: | |
64 | * | |
65 | * - Lookup a spa_t by name | |
66 | * - Add or remove a spa_t from the namespace | |
67 | * - Increase spa_refcount from non-zero | |
68 | * - Check if spa_refcount is zero | |
69 | * - Rename a spa_t | |
70 | * - add/remove/attach/detach devices | |
71 | * - Held for the duration of create/destroy/import/export | |
72 | * | |
73 | * It does not need to handle recursion. A create or destroy may | |
74 | * reference objects (files or zvols) in other pools, but by | |
75 | * definition they must have an existing reference, and will never need | |
76 | * to lookup a spa_t by name. | |
77 | * | |
78 | * spa_refcount (per-spa refcount_t protected by mutex) | |
79 | * | |
80 | * This reference count keep track of any active users of the spa_t. The | |
81 | * spa_t cannot be destroyed or freed while this is non-zero. Internally, | |
82 | * the refcount is never really 'zero' - opening a pool implicitly keeps | |
83 | * some references in the DMU. Internally we check against spa_minref, but | |
84 | * present the image of a zero/non-zero value to consumers. | |
85 | * | |
86 | * spa_config_lock[] (per-spa array of rwlocks) | |
87 | * | |
88 | * This protects the spa_t from config changes, and must be held in | |
89 | * the following circumstances: | |
90 | * | |
91 | * - RW_READER to perform I/O to the spa | |
92 | * - RW_WRITER to change the vdev config | |
93 | * | |
94 | * The locking order is fairly straightforward: | |
95 | * | |
96 | * spa_namespace_lock -> spa_refcount | |
97 | * | |
98 | * The namespace lock must be acquired to increase the refcount from 0 | |
99 | * or to check if it is zero. | |
100 | * | |
101 | * spa_refcount -> spa_config_lock[] | |
102 | * | |
103 | * There must be at least one valid reference on the spa_t to acquire | |
104 | * the config lock. | |
105 | * | |
106 | * spa_namespace_lock -> spa_config_lock[] | |
107 | * | |
108 | * The namespace lock must always be taken before the config lock. | |
109 | * | |
110 | * | |
111 | * The spa_namespace_lock can be acquired directly and is globally visible. | |
112 | * | |
113 | * The namespace is manipulated using the following functions, all of which | |
114 | * require the spa_namespace_lock to be held. | |
115 | * | |
116 | * spa_lookup() Lookup a spa_t by name. | |
117 | * | |
118 | * spa_add() Create a new spa_t in the namespace. | |
119 | * | |
120 | * spa_remove() Remove a spa_t from the namespace. This also | |
121 | * frees up any memory associated with the spa_t. | |
122 | * | |
123 | * spa_next() Returns the next spa_t in the system, or the | |
124 | * first if NULL is passed. | |
125 | * | |
126 | * spa_evict_all() Shutdown and remove all spa_t structures in | |
127 | * the system. | |
128 | * | |
129 | * spa_guid_exists() Determine whether a pool/device guid exists. | |
130 | * | |
131 | * The spa_refcount is manipulated using the following functions: | |
132 | * | |
133 | * spa_open_ref() Adds a reference to the given spa_t. Must be | |
134 | * called with spa_namespace_lock held if the | |
135 | * refcount is currently zero. | |
136 | * | |
137 | * spa_close() Remove a reference from the spa_t. This will | |
138 | * not free the spa_t or remove it from the | |
139 | * namespace. No locking is required. | |
140 | * | |
141 | * spa_refcount_zero() Returns true if the refcount is currently | |
142 | * zero. Must be called with spa_namespace_lock | |
143 | * held. | |
144 | * | |
145 | * The spa_config_lock[] is an array of rwlocks, ordered as follows: | |
146 | * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV. | |
147 | * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}(). | |
148 | * | |
149 | * To read the configuration, it suffices to hold one of these locks as reader. | |
150 | * To modify the configuration, you must hold all locks as writer. To modify | |
151 | * vdev state without altering the vdev tree's topology (e.g. online/offline), | |
152 | * you must hold SCL_STATE and SCL_ZIO as writer. | |
153 | * | |
154 | * We use these distinct config locks to avoid recursive lock entry. | |
155 | * For example, spa_sync() (which holds SCL_CONFIG as reader) induces | |
156 | * block allocations (SCL_ALLOC), which may require reading space maps | |
157 | * from disk (dmu_read() -> zio_read() -> SCL_ZIO). | |
158 | * | |
159 | * The spa config locks cannot be normal rwlocks because we need the | |
160 | * ability to hand off ownership. For example, SCL_ZIO is acquired | |
161 | * by the issuing thread and later released by an interrupt thread. | |
162 | * They do, however, obey the usual write-wanted semantics to prevent | |
163 | * writer (i.e. system administrator) starvation. | |
164 | * | |
165 | * The lock acquisition rules are as follows: | |
166 | * | |
167 | * SCL_CONFIG | |
168 | * Protects changes to the vdev tree topology, such as vdev | |
169 | * add/remove/attach/detach. Protects the dirty config list | |
170 | * (spa_config_dirty_list) and the set of spares and l2arc devices. | |
171 | * | |
172 | * SCL_STATE | |
173 | * Protects changes to pool state and vdev state, such as vdev | |
174 | * online/offline/fault/degrade/clear. Protects the dirty state list | |
175 | * (spa_state_dirty_list) and global pool state (spa_state). | |
176 | * | |
177 | * SCL_ALLOC | |
178 | * Protects changes to metaslab groups and classes. | |
179 | * Held as reader by metaslab_alloc() and metaslab_claim(). | |
180 | * | |
181 | * SCL_ZIO | |
182 | * Held by bp-level zios (those which have no io_vd upon entry) | |
183 | * to prevent changes to the vdev tree. The bp-level zio implicitly | |
184 | * protects all of its vdev child zios, which do not hold SCL_ZIO. | |
185 | * | |
186 | * SCL_FREE | |
187 | * Protects changes to metaslab groups and classes. | |
188 | * Held as reader by metaslab_free(). SCL_FREE is distinct from | |
189 | * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free | |
190 | * blocks in zio_done() while another i/o that holds either | |
191 | * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete. | |
192 | * | |
193 | * SCL_VDEV | |
194 | * Held as reader to prevent changes to the vdev tree during trivial | |
195 | * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the | |
196 | * other locks, and lower than all of them, to ensure that it's safe | |
197 | * to acquire regardless of caller context. | |
198 | * | |
199 | * In addition, the following rules apply: | |
200 | * | |
201 | * (a) spa_props_lock protects pool properties, spa_config and spa_config_list. | |
202 | * The lock ordering is SCL_CONFIG > spa_props_lock. | |
203 | * | |
204 | * (b) I/O operations on leaf vdevs. For any zio operation that takes | |
205 | * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(), | |
206 | * or zio_write_phys() -- the caller must ensure that the config cannot | |
207 | * cannot change in the interim, and that the vdev cannot be reopened. | |
208 | * SCL_STATE as reader suffices for both. | |
209 | * | |
210 | * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit(). | |
211 | * | |
212 | * spa_vdev_enter() Acquire the namespace lock and the config lock | |
213 | * for writing. | |
214 | * | |
215 | * spa_vdev_exit() Release the config lock, wait for all I/O | |
216 | * to complete, sync the updated configs to the | |
217 | * cache, and release the namespace lock. | |
218 | * | |
219 | * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit(). | |
220 | * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual | |
221 | * locking is, always, based on spa_namespace_lock and spa_config_lock[]. | |
222 | * | |
223 | * spa_rename() is also implemented within this file since it requires | |
224 | * manipulation of the namespace. | |
225 | */ | |
226 | ||
227 | static avl_tree_t spa_namespace_avl; | |
228 | kmutex_t spa_namespace_lock; | |
229 | static kcondvar_t spa_namespace_cv; | |
230 | static int spa_active_count; | |
231 | int spa_max_replication_override = SPA_DVAS_PER_BP; | |
232 | ||
233 | static kmutex_t spa_spare_lock; | |
234 | static avl_tree_t spa_spare_avl; | |
235 | static kmutex_t spa_l2cache_lock; | |
236 | static avl_tree_t spa_l2cache_avl; | |
237 | ||
238 | kmem_cache_t *spa_buffer_pool; | |
239 | int spa_mode_global; | |
240 | ||
241 | #ifdef ZFS_DEBUG | |
242 | /* Everything except dprintf and spa is on by default in debug builds */ | |
243 | int zfs_flags = ~(ZFS_DEBUG_DPRINTF | ZFS_DEBUG_SPA); | |
244 | #else | |
245 | int zfs_flags = 0; | |
246 | #endif | |
247 | ||
248 | /* | |
249 | * zfs_recover can be set to nonzero to attempt to recover from | |
250 | * otherwise-fatal errors, typically caused by on-disk corruption. When | |
251 | * set, calls to zfs_panic_recover() will turn into warning messages. | |
252 | * This should only be used as a last resort, as it typically results | |
253 | * in leaked space, or worse. | |
254 | */ | |
255 | int zfs_recover = B_FALSE; | |
256 | ||
257 | /* | |
258 | * If destroy encounters an EIO while reading metadata (e.g. indirect | |
259 | * blocks), space referenced by the missing metadata can not be freed. | |
260 | * Normally this causes the background destroy to become "stalled", as | |
261 | * it is unable to make forward progress. While in this stalled state, | |
262 | * all remaining space to free from the error-encountering filesystem is | |
263 | * "temporarily leaked". Set this flag to cause it to ignore the EIO, | |
264 | * permanently leak the space from indirect blocks that can not be read, | |
265 | * and continue to free everything else that it can. | |
266 | * | |
267 | * The default, "stalling" behavior is useful if the storage partially | |
268 | * fails (i.e. some but not all i/os fail), and then later recovers. In | |
269 | * this case, we will be able to continue pool operations while it is | |
270 | * partially failed, and when it recovers, we can continue to free the | |
271 | * space, with no leaks. However, note that this case is actually | |
272 | * fairly rare. | |
273 | * | |
274 | * Typically pools either (a) fail completely (but perhaps temporarily, | |
275 | * e.g. a top-level vdev going offline), or (b) have localized, | |
276 | * permanent errors (e.g. disk returns the wrong data due to bit flip or | |
277 | * firmware bug). In case (a), this setting does not matter because the | |
278 | * pool will be suspended and the sync thread will not be able to make | |
279 | * forward progress regardless. In case (b), because the error is | |
280 | * permanent, the best we can do is leak the minimum amount of space, | |
281 | * which is what setting this flag will do. Therefore, it is reasonable | |
282 | * for this flag to normally be set, but we chose the more conservative | |
283 | * approach of not setting it, so that there is no possibility of | |
284 | * leaking space in the "partial temporary" failure case. | |
285 | */ | |
286 | int zfs_free_leak_on_eio = B_FALSE; | |
287 | ||
288 | /* | |
289 | * Expiration time in milliseconds. This value has two meanings. First it is | |
290 | * used to determine when the spa_deadman() logic should fire. By default the | |
291 | * spa_deadman() will fire if spa_sync() has not completed in 1000 seconds. | |
292 | * Secondly, the value determines if an I/O is considered "hung". Any I/O that | |
293 | * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting | |
294 | * in a system panic. | |
295 | */ | |
296 | unsigned long zfs_deadman_synctime_ms = 1000000ULL; | |
297 | ||
298 | /* | |
299 | * By default the deadman is enabled. | |
300 | */ | |
301 | int zfs_deadman_enabled = 1; | |
302 | ||
303 | /* | |
304 | * The worst case is single-sector max-parity RAID-Z blocks, in which | |
305 | * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1) | |
306 | * times the size; so just assume that. Add to this the fact that | |
307 | * we can have up to 3 DVAs per bp, and one more factor of 2 because | |
308 | * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together, | |
309 | * the worst case is: | |
310 | * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24 | |
311 | */ | |
312 | int spa_asize_inflation = 24; | |
313 | ||
314 | /* | |
315 | * ========================================================================== | |
316 | * SPA config locking | |
317 | * ========================================================================== | |
318 | */ | |
319 | static void | |
320 | spa_config_lock_init(spa_t *spa) | |
321 | { | |
322 | int i; | |
323 | ||
324 | for (i = 0; i < SCL_LOCKS; i++) { | |
325 | spa_config_lock_t *scl = &spa->spa_config_lock[i]; | |
326 | mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL); | |
327 | cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL); | |
328 | refcount_create_untracked(&scl->scl_count); | |
329 | scl->scl_writer = NULL; | |
330 | scl->scl_write_wanted = 0; | |
331 | } | |
332 | } | |
333 | ||
334 | static void | |
335 | spa_config_lock_destroy(spa_t *spa) | |
336 | { | |
337 | int i; | |
338 | ||
339 | for (i = 0; i < SCL_LOCKS; i++) { | |
340 | spa_config_lock_t *scl = &spa->spa_config_lock[i]; | |
341 | mutex_destroy(&scl->scl_lock); | |
342 | cv_destroy(&scl->scl_cv); | |
343 | refcount_destroy(&scl->scl_count); | |
344 | ASSERT(scl->scl_writer == NULL); | |
345 | ASSERT(scl->scl_write_wanted == 0); | |
346 | } | |
347 | } | |
348 | ||
349 | int | |
350 | spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw) | |
351 | { | |
352 | int i; | |
353 | ||
354 | for (i = 0; i < SCL_LOCKS; i++) { | |
355 | spa_config_lock_t *scl = &spa->spa_config_lock[i]; | |
356 | if (!(locks & (1 << i))) | |
357 | continue; | |
358 | mutex_enter(&scl->scl_lock); | |
359 | if (rw == RW_READER) { | |
360 | if (scl->scl_writer || scl->scl_write_wanted) { | |
361 | mutex_exit(&scl->scl_lock); | |
362 | spa_config_exit(spa, locks ^ (1 << i), tag); | |
363 | return (0); | |
364 | } | |
365 | } else { | |
366 | ASSERT(scl->scl_writer != curthread); | |
367 | if (!refcount_is_zero(&scl->scl_count)) { | |
368 | mutex_exit(&scl->scl_lock); | |
369 | spa_config_exit(spa, locks ^ (1 << i), tag); | |
370 | return (0); | |
371 | } | |
372 | scl->scl_writer = curthread; | |
373 | } | |
374 | (void) refcount_add(&scl->scl_count, tag); | |
375 | mutex_exit(&scl->scl_lock); | |
376 | } | |
377 | return (1); | |
378 | } | |
379 | ||
380 | void | |
381 | spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw) | |
382 | { | |
383 | int wlocks_held = 0; | |
384 | int i; | |
385 | ||
386 | ASSERT3U(SCL_LOCKS, <, sizeof (wlocks_held) * NBBY); | |
387 | ||
388 | for (i = 0; i < SCL_LOCKS; i++) { | |
389 | spa_config_lock_t *scl = &spa->spa_config_lock[i]; | |
390 | if (scl->scl_writer == curthread) | |
391 | wlocks_held |= (1 << i); | |
392 | if (!(locks & (1 << i))) | |
393 | continue; | |
394 | mutex_enter(&scl->scl_lock); | |
395 | if (rw == RW_READER) { | |
396 | while (scl->scl_writer || scl->scl_write_wanted) { | |
397 | cv_wait(&scl->scl_cv, &scl->scl_lock); | |
398 | } | |
399 | } else { | |
400 | ASSERT(scl->scl_writer != curthread); | |
401 | while (!refcount_is_zero(&scl->scl_count)) { | |
402 | scl->scl_write_wanted++; | |
403 | cv_wait(&scl->scl_cv, &scl->scl_lock); | |
404 | scl->scl_write_wanted--; | |
405 | } | |
406 | scl->scl_writer = curthread; | |
407 | } | |
408 | (void) refcount_add(&scl->scl_count, tag); | |
409 | mutex_exit(&scl->scl_lock); | |
410 | } | |
411 | ASSERT(wlocks_held <= locks); | |
412 | } | |
413 | ||
414 | void | |
415 | spa_config_exit(spa_t *spa, int locks, void *tag) | |
416 | { | |
417 | int i; | |
418 | ||
419 | for (i = SCL_LOCKS - 1; i >= 0; i--) { | |
420 | spa_config_lock_t *scl = &spa->spa_config_lock[i]; | |
421 | if (!(locks & (1 << i))) | |
422 | continue; | |
423 | mutex_enter(&scl->scl_lock); | |
424 | ASSERT(!refcount_is_zero(&scl->scl_count)); | |
425 | if (refcount_remove(&scl->scl_count, tag) == 0) { | |
426 | ASSERT(scl->scl_writer == NULL || | |
427 | scl->scl_writer == curthread); | |
428 | scl->scl_writer = NULL; /* OK in either case */ | |
429 | cv_broadcast(&scl->scl_cv); | |
430 | } | |
431 | mutex_exit(&scl->scl_lock); | |
432 | } | |
433 | } | |
434 | ||
435 | int | |
436 | spa_config_held(spa_t *spa, int locks, krw_t rw) | |
437 | { | |
438 | int i, locks_held = 0; | |
439 | ||
440 | for (i = 0; i < SCL_LOCKS; i++) { | |
441 | spa_config_lock_t *scl = &spa->spa_config_lock[i]; | |
442 | if (!(locks & (1 << i))) | |
443 | continue; | |
444 | if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) || | |
445 | (rw == RW_WRITER && scl->scl_writer == curthread)) | |
446 | locks_held |= 1 << i; | |
447 | } | |
448 | ||
449 | return (locks_held); | |
450 | } | |
451 | ||
452 | /* | |
453 | * ========================================================================== | |
454 | * SPA namespace functions | |
455 | * ========================================================================== | |
456 | */ | |
457 | ||
458 | /* | |
459 | * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held. | |
460 | * Returns NULL if no matching spa_t is found. | |
461 | */ | |
462 | spa_t * | |
463 | spa_lookup(const char *name) | |
464 | { | |
465 | static spa_t search; /* spa_t is large; don't allocate on stack */ | |
466 | spa_t *spa; | |
467 | avl_index_t where; | |
468 | char *cp; | |
469 | ||
470 | ASSERT(MUTEX_HELD(&spa_namespace_lock)); | |
471 | ||
472 | (void) strlcpy(search.spa_name, name, sizeof (search.spa_name)); | |
473 | ||
474 | /* | |
475 | * If it's a full dataset name, figure out the pool name and | |
476 | * just use that. | |
477 | */ | |
478 | cp = strpbrk(search.spa_name, "/@#"); | |
479 | if (cp != NULL) | |
480 | *cp = '\0'; | |
481 | ||
482 | spa = avl_find(&spa_namespace_avl, &search, &where); | |
483 | ||
484 | return (spa); | |
485 | } | |
486 | ||
487 | /* | |
488 | * Fires when spa_sync has not completed within zfs_deadman_synctime_ms. | |
489 | * If the zfs_deadman_enabled flag is set then it inspects all vdev queues | |
490 | * looking for potentially hung I/Os. | |
491 | */ | |
492 | void | |
493 | spa_deadman(void *arg) | |
494 | { | |
495 | spa_t *spa = arg; | |
496 | ||
497 | zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu", | |
498 | (gethrtime() - spa->spa_sync_starttime) / NANOSEC, | |
499 | ++spa->spa_deadman_calls); | |
500 | if (zfs_deadman_enabled) | |
501 | vdev_deadman(spa->spa_root_vdev); | |
502 | ||
503 | spa->spa_deadman_tqid = taskq_dispatch_delay(system_taskq, | |
504 | spa_deadman, spa, KM_SLEEP, ddi_get_lbolt() + | |
505 | NSEC_TO_TICK(spa->spa_deadman_synctime)); | |
506 | } | |
507 | ||
508 | /* | |
509 | * Create an uninitialized spa_t with the given name. Requires | |
510 | * spa_namespace_lock. The caller must ensure that the spa_t doesn't already | |
511 | * exist by calling spa_lookup() first. | |
512 | */ | |
513 | spa_t * | |
514 | spa_add(const char *name, nvlist_t *config, const char *altroot) | |
515 | { | |
516 | spa_t *spa; | |
517 | spa_config_dirent_t *dp; | |
518 | int t; | |
519 | int i; | |
520 | ||
521 | ASSERT(MUTEX_HELD(&spa_namespace_lock)); | |
522 | ||
523 | spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP); | |
524 | ||
525 | mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL); | |
526 | mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL); | |
527 | mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL); | |
528 | mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL); | |
529 | mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL); | |
530 | mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL); | |
531 | mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL); | |
532 | mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL); | |
533 | mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL); | |
534 | mutex_init(&spa->spa_feat_stats_lock, NULL, MUTEX_DEFAULT, NULL); | |
535 | ||
536 | cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL); | |
537 | cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL); | |
538 | cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL); | |
539 | cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL); | |
540 | ||
541 | for (t = 0; t < TXG_SIZE; t++) | |
542 | bplist_create(&spa->spa_free_bplist[t]); | |
543 | ||
544 | (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name)); | |
545 | spa->spa_state = POOL_STATE_UNINITIALIZED; | |
546 | spa->spa_freeze_txg = UINT64_MAX; | |
547 | spa->spa_final_txg = UINT64_MAX; | |
548 | spa->spa_load_max_txg = UINT64_MAX; | |
549 | spa->spa_proc = &p0; | |
550 | spa->spa_proc_state = SPA_PROC_NONE; | |
551 | ||
552 | spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime_ms); | |
553 | ||
554 | refcount_create(&spa->spa_refcount); | |
555 | spa_config_lock_init(spa); | |
556 | spa_stats_init(spa); | |
557 | ||
558 | avl_add(&spa_namespace_avl, spa); | |
559 | ||
560 | /* | |
561 | * Set the alternate root, if there is one. | |
562 | */ | |
563 | if (altroot) { | |
564 | spa->spa_root = spa_strdup(altroot); | |
565 | spa_active_count++; | |
566 | } | |
567 | ||
568 | /* | |
569 | * Every pool starts with the default cachefile | |
570 | */ | |
571 | list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t), | |
572 | offsetof(spa_config_dirent_t, scd_link)); | |
573 | ||
574 | dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP); | |
575 | dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path); | |
576 | list_insert_head(&spa->spa_config_list, dp); | |
577 | ||
578 | VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME, | |
579 | KM_SLEEP) == 0); | |
580 | ||
581 | if (config != NULL) { | |
582 | nvlist_t *features; | |
583 | ||
584 | if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ, | |
585 | &features) == 0) { | |
586 | VERIFY(nvlist_dup(features, &spa->spa_label_features, | |
587 | 0) == 0); | |
588 | } | |
589 | ||
590 | VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0); | |
591 | } | |
592 | ||
593 | if (spa->spa_label_features == NULL) { | |
594 | VERIFY(nvlist_alloc(&spa->spa_label_features, NV_UNIQUE_NAME, | |
595 | KM_SLEEP) == 0); | |
596 | } | |
597 | ||
598 | spa->spa_debug = ((zfs_flags & ZFS_DEBUG_SPA) != 0); | |
599 | ||
600 | /* | |
601 | * As a pool is being created, treat all features as disabled by | |
602 | * setting SPA_FEATURE_DISABLED for all entries in the feature | |
603 | * refcount cache. | |
604 | */ | |
605 | for (i = 0; i < SPA_FEATURES; i++) { | |
606 | spa->spa_feat_refcount_cache[i] = SPA_FEATURE_DISABLED; | |
607 | } | |
608 | ||
609 | return (spa); | |
610 | } | |
611 | ||
612 | /* | |
613 | * Removes a spa_t from the namespace, freeing up any memory used. Requires | |
614 | * spa_namespace_lock. This is called only after the spa_t has been closed and | |
615 | * deactivated. | |
616 | */ | |
617 | void | |
618 | spa_remove(spa_t *spa) | |
619 | { | |
620 | spa_config_dirent_t *dp; | |
621 | int t; | |
622 | ||
623 | ASSERT(MUTEX_HELD(&spa_namespace_lock)); | |
624 | ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); | |
625 | ||
626 | nvlist_free(spa->spa_config_splitting); | |
627 | ||
628 | avl_remove(&spa_namespace_avl, spa); | |
629 | cv_broadcast(&spa_namespace_cv); | |
630 | ||
631 | if (spa->spa_root) { | |
632 | spa_strfree(spa->spa_root); | |
633 | spa_active_count--; | |
634 | } | |
635 | ||
636 | while ((dp = list_head(&spa->spa_config_list)) != NULL) { | |
637 | list_remove(&spa->spa_config_list, dp); | |
638 | if (dp->scd_path != NULL) | |
639 | spa_strfree(dp->scd_path); | |
640 | kmem_free(dp, sizeof (spa_config_dirent_t)); | |
641 | } | |
642 | ||
643 | list_destroy(&spa->spa_config_list); | |
644 | ||
645 | nvlist_free(spa->spa_label_features); | |
646 | nvlist_free(spa->spa_load_info); | |
647 | nvlist_free(spa->spa_feat_stats); | |
648 | spa_config_set(spa, NULL); | |
649 | ||
650 | refcount_destroy(&spa->spa_refcount); | |
651 | ||
652 | spa_stats_destroy(spa); | |
653 | spa_config_lock_destroy(spa); | |
654 | ||
655 | for (t = 0; t < TXG_SIZE; t++) | |
656 | bplist_destroy(&spa->spa_free_bplist[t]); | |
657 | ||
658 | cv_destroy(&spa->spa_async_cv); | |
659 | cv_destroy(&spa->spa_proc_cv); | |
660 | cv_destroy(&spa->spa_scrub_io_cv); | |
661 | cv_destroy(&spa->spa_suspend_cv); | |
662 | ||
663 | mutex_destroy(&spa->spa_async_lock); | |
664 | mutex_destroy(&spa->spa_errlist_lock); | |
665 | mutex_destroy(&spa->spa_errlog_lock); | |
666 | mutex_destroy(&spa->spa_history_lock); | |
667 | mutex_destroy(&spa->spa_proc_lock); | |
668 | mutex_destroy(&spa->spa_props_lock); | |
669 | mutex_destroy(&spa->spa_scrub_lock); | |
670 | mutex_destroy(&spa->spa_suspend_lock); | |
671 | mutex_destroy(&spa->spa_vdev_top_lock); | |
672 | mutex_destroy(&spa->spa_feat_stats_lock); | |
673 | ||
674 | kmem_free(spa, sizeof (spa_t)); | |
675 | } | |
676 | ||
677 | /* | |
678 | * Given a pool, return the next pool in the namespace, or NULL if there is | |
679 | * none. If 'prev' is NULL, return the first pool. | |
680 | */ | |
681 | spa_t * | |
682 | spa_next(spa_t *prev) | |
683 | { | |
684 | ASSERT(MUTEX_HELD(&spa_namespace_lock)); | |
685 | ||
686 | if (prev) | |
687 | return (AVL_NEXT(&spa_namespace_avl, prev)); | |
688 | else | |
689 | return (avl_first(&spa_namespace_avl)); | |
690 | } | |
691 | ||
692 | /* | |
693 | * ========================================================================== | |
694 | * SPA refcount functions | |
695 | * ========================================================================== | |
696 | */ | |
697 | ||
698 | /* | |
699 | * Add a reference to the given spa_t. Must have at least one reference, or | |
700 | * have the namespace lock held. | |
701 | */ | |
702 | void | |
703 | spa_open_ref(spa_t *spa, void *tag) | |
704 | { | |
705 | ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref || | |
706 | MUTEX_HELD(&spa_namespace_lock)); | |
707 | (void) refcount_add(&spa->spa_refcount, tag); | |
708 | } | |
709 | ||
710 | /* | |
711 | * Remove a reference to the given spa_t. Must have at least one reference, or | |
712 | * have the namespace lock held. | |
713 | */ | |
714 | void | |
715 | spa_close(spa_t *spa, void *tag) | |
716 | { | |
717 | ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref || | |
718 | MUTEX_HELD(&spa_namespace_lock)); | |
719 | (void) refcount_remove(&spa->spa_refcount, tag); | |
720 | } | |
721 | ||
722 | /* | |
723 | * Check to see if the spa refcount is zero. Must be called with | |
724 | * spa_namespace_lock held. We really compare against spa_minref, which is the | |
725 | * number of references acquired when opening a pool | |
726 | */ | |
727 | boolean_t | |
728 | spa_refcount_zero(spa_t *spa) | |
729 | { | |
730 | ASSERT(MUTEX_HELD(&spa_namespace_lock)); | |
731 | ||
732 | return (refcount_count(&spa->spa_refcount) == spa->spa_minref); | |
733 | } | |
734 | ||
735 | /* | |
736 | * ========================================================================== | |
737 | * SPA spare and l2cache tracking | |
738 | * ========================================================================== | |
739 | */ | |
740 | ||
741 | /* | |
742 | * Hot spares and cache devices are tracked using the same code below, | |
743 | * for 'auxiliary' devices. | |
744 | */ | |
745 | ||
746 | typedef struct spa_aux { | |
747 | uint64_t aux_guid; | |
748 | uint64_t aux_pool; | |
749 | avl_node_t aux_avl; | |
750 | int aux_count; | |
751 | } spa_aux_t; | |
752 | ||
753 | static int | |
754 | spa_aux_compare(const void *a, const void *b) | |
755 | { | |
756 | const spa_aux_t *sa = a; | |
757 | const spa_aux_t *sb = b; | |
758 | ||
759 | if (sa->aux_guid < sb->aux_guid) | |
760 | return (-1); | |
761 | else if (sa->aux_guid > sb->aux_guid) | |
762 | return (1); | |
763 | else | |
764 | return (0); | |
765 | } | |
766 | ||
767 | void | |
768 | spa_aux_add(vdev_t *vd, avl_tree_t *avl) | |
769 | { | |
770 | avl_index_t where; | |
771 | spa_aux_t search; | |
772 | spa_aux_t *aux; | |
773 | ||
774 | search.aux_guid = vd->vdev_guid; | |
775 | if ((aux = avl_find(avl, &search, &where)) != NULL) { | |
776 | aux->aux_count++; | |
777 | } else { | |
778 | aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP); | |
779 | aux->aux_guid = vd->vdev_guid; | |
780 | aux->aux_count = 1; | |
781 | avl_insert(avl, aux, where); | |
782 | } | |
783 | } | |
784 | ||
785 | void | |
786 | spa_aux_remove(vdev_t *vd, avl_tree_t *avl) | |
787 | { | |
788 | spa_aux_t search; | |
789 | spa_aux_t *aux; | |
790 | avl_index_t where; | |
791 | ||
792 | search.aux_guid = vd->vdev_guid; | |
793 | aux = avl_find(avl, &search, &where); | |
794 | ||
795 | ASSERT(aux != NULL); | |
796 | ||
797 | if (--aux->aux_count == 0) { | |
798 | avl_remove(avl, aux); | |
799 | kmem_free(aux, sizeof (spa_aux_t)); | |
800 | } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) { | |
801 | aux->aux_pool = 0ULL; | |
802 | } | |
803 | } | |
804 | ||
805 | boolean_t | |
806 | spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl) | |
807 | { | |
808 | spa_aux_t search, *found; | |
809 | ||
810 | search.aux_guid = guid; | |
811 | found = avl_find(avl, &search, NULL); | |
812 | ||
813 | if (pool) { | |
814 | if (found) | |
815 | *pool = found->aux_pool; | |
816 | else | |
817 | *pool = 0ULL; | |
818 | } | |
819 | ||
820 | if (refcnt) { | |
821 | if (found) | |
822 | *refcnt = found->aux_count; | |
823 | else | |
824 | *refcnt = 0; | |
825 | } | |
826 | ||
827 | return (found != NULL); | |
828 | } | |
829 | ||
830 | void | |
831 | spa_aux_activate(vdev_t *vd, avl_tree_t *avl) | |
832 | { | |
833 | spa_aux_t search, *found; | |
834 | avl_index_t where; | |
835 | ||
836 | search.aux_guid = vd->vdev_guid; | |
837 | found = avl_find(avl, &search, &where); | |
838 | ASSERT(found != NULL); | |
839 | ASSERT(found->aux_pool == 0ULL); | |
840 | ||
841 | found->aux_pool = spa_guid(vd->vdev_spa); | |
842 | } | |
843 | ||
844 | /* | |
845 | * Spares are tracked globally due to the following constraints: | |
846 | * | |
847 | * - A spare may be part of multiple pools. | |
848 | * - A spare may be added to a pool even if it's actively in use within | |
849 | * another pool. | |
850 | * - A spare in use in any pool can only be the source of a replacement if | |
851 | * the target is a spare in the same pool. | |
852 | * | |
853 | * We keep track of all spares on the system through the use of a reference | |
854 | * counted AVL tree. When a vdev is added as a spare, or used as a replacement | |
855 | * spare, then we bump the reference count in the AVL tree. In addition, we set | |
856 | * the 'vdev_isspare' member to indicate that the device is a spare (active or | |
857 | * inactive). When a spare is made active (used to replace a device in the | |
858 | * pool), we also keep track of which pool its been made a part of. | |
859 | * | |
860 | * The 'spa_spare_lock' protects the AVL tree. These functions are normally | |
861 | * called under the spa_namespace lock as part of vdev reconfiguration. The | |
862 | * separate spare lock exists for the status query path, which does not need to | |
863 | * be completely consistent with respect to other vdev configuration changes. | |
864 | */ | |
865 | ||
866 | static int | |
867 | spa_spare_compare(const void *a, const void *b) | |
868 | { | |
869 | return (spa_aux_compare(a, b)); | |
870 | } | |
871 | ||
872 | void | |
873 | spa_spare_add(vdev_t *vd) | |
874 | { | |
875 | mutex_enter(&spa_spare_lock); | |
876 | ASSERT(!vd->vdev_isspare); | |
877 | spa_aux_add(vd, &spa_spare_avl); | |
878 | vd->vdev_isspare = B_TRUE; | |
879 | mutex_exit(&spa_spare_lock); | |
880 | } | |
881 | ||
882 | void | |
883 | spa_spare_remove(vdev_t *vd) | |
884 | { | |
885 | mutex_enter(&spa_spare_lock); | |
886 | ASSERT(vd->vdev_isspare); | |
887 | spa_aux_remove(vd, &spa_spare_avl); | |
888 | vd->vdev_isspare = B_FALSE; | |
889 | mutex_exit(&spa_spare_lock); | |
890 | } | |
891 | ||
892 | boolean_t | |
893 | spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt) | |
894 | { | |
895 | boolean_t found; | |
896 | ||
897 | mutex_enter(&spa_spare_lock); | |
898 | found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl); | |
899 | mutex_exit(&spa_spare_lock); | |
900 | ||
901 | return (found); | |
902 | } | |
903 | ||
904 | void | |
905 | spa_spare_activate(vdev_t *vd) | |
906 | { | |
907 | mutex_enter(&spa_spare_lock); | |
908 | ASSERT(vd->vdev_isspare); | |
909 | spa_aux_activate(vd, &spa_spare_avl); | |
910 | mutex_exit(&spa_spare_lock); | |
911 | } | |
912 | ||
913 | /* | |
914 | * Level 2 ARC devices are tracked globally for the same reasons as spares. | |
915 | * Cache devices currently only support one pool per cache device, and so | |
916 | * for these devices the aux reference count is currently unused beyond 1. | |
917 | */ | |
918 | ||
919 | static int | |
920 | spa_l2cache_compare(const void *a, const void *b) | |
921 | { | |
922 | return (spa_aux_compare(a, b)); | |
923 | } | |
924 | ||
925 | void | |
926 | spa_l2cache_add(vdev_t *vd) | |
927 | { | |
928 | mutex_enter(&spa_l2cache_lock); | |
929 | ASSERT(!vd->vdev_isl2cache); | |
930 | spa_aux_add(vd, &spa_l2cache_avl); | |
931 | vd->vdev_isl2cache = B_TRUE; | |
932 | mutex_exit(&spa_l2cache_lock); | |
933 | } | |
934 | ||
935 | void | |
936 | spa_l2cache_remove(vdev_t *vd) | |
937 | { | |
938 | mutex_enter(&spa_l2cache_lock); | |
939 | ASSERT(vd->vdev_isl2cache); | |
940 | spa_aux_remove(vd, &spa_l2cache_avl); | |
941 | vd->vdev_isl2cache = B_FALSE; | |
942 | mutex_exit(&spa_l2cache_lock); | |
943 | } | |
944 | ||
945 | boolean_t | |
946 | spa_l2cache_exists(uint64_t guid, uint64_t *pool) | |
947 | { | |
948 | boolean_t found; | |
949 | ||
950 | mutex_enter(&spa_l2cache_lock); | |
951 | found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl); | |
952 | mutex_exit(&spa_l2cache_lock); | |
953 | ||
954 | return (found); | |
955 | } | |
956 | ||
957 | void | |
958 | spa_l2cache_activate(vdev_t *vd) | |
959 | { | |
960 | mutex_enter(&spa_l2cache_lock); | |
961 | ASSERT(vd->vdev_isl2cache); | |
962 | spa_aux_activate(vd, &spa_l2cache_avl); | |
963 | mutex_exit(&spa_l2cache_lock); | |
964 | } | |
965 | ||
966 | /* | |
967 | * ========================================================================== | |
968 | * SPA vdev locking | |
969 | * ========================================================================== | |
970 | */ | |
971 | ||
972 | /* | |
973 | * Lock the given spa_t for the purpose of adding or removing a vdev. | |
974 | * Grabs the global spa_namespace_lock plus the spa config lock for writing. | |
975 | * It returns the next transaction group for the spa_t. | |
976 | */ | |
977 | uint64_t | |
978 | spa_vdev_enter(spa_t *spa) | |
979 | { | |
980 | mutex_enter(&spa->spa_vdev_top_lock); | |
981 | mutex_enter(&spa_namespace_lock); | |
982 | return (spa_vdev_config_enter(spa)); | |
983 | } | |
984 | ||
985 | /* | |
986 | * Internal implementation for spa_vdev_enter(). Used when a vdev | |
987 | * operation requires multiple syncs (i.e. removing a device) while | |
988 | * keeping the spa_namespace_lock held. | |
989 | */ | |
990 | uint64_t | |
991 | spa_vdev_config_enter(spa_t *spa) | |
992 | { | |
993 | ASSERT(MUTEX_HELD(&spa_namespace_lock)); | |
994 | ||
995 | spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); | |
996 | ||
997 | return (spa_last_synced_txg(spa) + 1); | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * Used in combination with spa_vdev_config_enter() to allow the syncing | |
1002 | * of multiple transactions without releasing the spa_namespace_lock. | |
1003 | */ | |
1004 | void | |
1005 | spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag) | |
1006 | { | |
1007 | int config_changed = B_FALSE; | |
1008 | ||
1009 | ASSERT(MUTEX_HELD(&spa_namespace_lock)); | |
1010 | ASSERT(txg > spa_last_synced_txg(spa)); | |
1011 | ||
1012 | spa->spa_pending_vdev = NULL; | |
1013 | ||
1014 | /* | |
1015 | * Reassess the DTLs. | |
1016 | */ | |
1017 | vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE); | |
1018 | ||
1019 | if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) { | |
1020 | config_changed = B_TRUE; | |
1021 | spa->spa_config_generation++; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Verify the metaslab classes. | |
1026 | */ | |
1027 | ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0); | |
1028 | ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0); | |
1029 | ||
1030 | spa_config_exit(spa, SCL_ALL, spa); | |
1031 | ||
1032 | /* | |
1033 | * Panic the system if the specified tag requires it. This | |
1034 | * is useful for ensuring that configurations are updated | |
1035 | * transactionally. | |
1036 | */ | |
1037 | if (zio_injection_enabled) | |
1038 | zio_handle_panic_injection(spa, tag, 0); | |
1039 | ||
1040 | /* | |
1041 | * Note: this txg_wait_synced() is important because it ensures | |
1042 | * that there won't be more than one config change per txg. | |
1043 | * This allows us to use the txg as the generation number. | |
1044 | */ | |
1045 | if (error == 0) | |
1046 | txg_wait_synced(spa->spa_dsl_pool, txg); | |
1047 | ||
1048 | if (vd != NULL) { | |
1049 | ASSERT(!vd->vdev_detached || vd->vdev_dtl_sm == NULL); | |
1050 | spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); | |
1051 | vdev_free(vd); | |
1052 | spa_config_exit(spa, SCL_ALL, spa); | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * If the config changed, update the config cache. | |
1057 | */ | |
1058 | if (config_changed) | |
1059 | spa_config_sync(spa, B_FALSE, B_TRUE); | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Unlock the spa_t after adding or removing a vdev. Besides undoing the | |
1064 | * locking of spa_vdev_enter(), we also want make sure the transactions have | |
1065 | * synced to disk, and then update the global configuration cache with the new | |
1066 | * information. | |
1067 | */ | |
1068 | int | |
1069 | spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error) | |
1070 | { | |
1071 | spa_vdev_config_exit(spa, vd, txg, error, FTAG); | |
1072 | mutex_exit(&spa_namespace_lock); | |
1073 | mutex_exit(&spa->spa_vdev_top_lock); | |
1074 | ||
1075 | return (error); | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Lock the given spa_t for the purpose of changing vdev state. | |
1080 | */ | |
1081 | void | |
1082 | spa_vdev_state_enter(spa_t *spa, int oplocks) | |
1083 | { | |
1084 | int locks = SCL_STATE_ALL | oplocks; | |
1085 | ||
1086 | /* | |
1087 | * Root pools may need to read of the underlying devfs filesystem | |
1088 | * when opening up a vdev. Unfortunately if we're holding the | |
1089 | * SCL_ZIO lock it will result in a deadlock when we try to issue | |
1090 | * the read from the root filesystem. Instead we "prefetch" | |
1091 | * the associated vnodes that we need prior to opening the | |
1092 | * underlying devices and cache them so that we can prevent | |
1093 | * any I/O when we are doing the actual open. | |
1094 | */ | |
1095 | if (spa_is_root(spa)) { | |
1096 | int low = locks & ~(SCL_ZIO - 1); | |
1097 | int high = locks & ~low; | |
1098 | ||
1099 | spa_config_enter(spa, high, spa, RW_WRITER); | |
1100 | vdev_hold(spa->spa_root_vdev); | |
1101 | spa_config_enter(spa, low, spa, RW_WRITER); | |
1102 | } else { | |
1103 | spa_config_enter(spa, locks, spa, RW_WRITER); | |
1104 | } | |
1105 | spa->spa_vdev_locks = locks; | |
1106 | } | |
1107 | ||
1108 | int | |
1109 | spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error) | |
1110 | { | |
1111 | boolean_t config_changed = B_FALSE; | |
1112 | ||
1113 | if (vd != NULL || error == 0) | |
1114 | vdev_dtl_reassess(vd ? vd->vdev_top : spa->spa_root_vdev, | |
1115 | 0, 0, B_FALSE); | |
1116 | ||
1117 | if (vd != NULL) { | |
1118 | vdev_state_dirty(vd->vdev_top); | |
1119 | config_changed = B_TRUE; | |
1120 | spa->spa_config_generation++; | |
1121 | } | |
1122 | ||
1123 | if (spa_is_root(spa)) | |
1124 | vdev_rele(spa->spa_root_vdev); | |
1125 | ||
1126 | ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL); | |
1127 | spa_config_exit(spa, spa->spa_vdev_locks, spa); | |
1128 | ||
1129 | /* | |
1130 | * If anything changed, wait for it to sync. This ensures that, | |
1131 | * from the system administrator's perspective, zpool(1M) commands | |
1132 | * are synchronous. This is important for things like zpool offline: | |
1133 | * when the command completes, you expect no further I/O from ZFS. | |
1134 | */ | |
1135 | if (vd != NULL) | |
1136 | txg_wait_synced(spa->spa_dsl_pool, 0); | |
1137 | ||
1138 | /* | |
1139 | * If the config changed, update the config cache. | |
1140 | */ | |
1141 | if (config_changed) { | |
1142 | mutex_enter(&spa_namespace_lock); | |
1143 | spa_config_sync(spa, B_FALSE, B_TRUE); | |
1144 | mutex_exit(&spa_namespace_lock); | |
1145 | } | |
1146 | ||
1147 | return (error); | |
1148 | } | |
1149 | ||
1150 | /* | |
1151 | * ========================================================================== | |
1152 | * Miscellaneous functions | |
1153 | * ========================================================================== | |
1154 | */ | |
1155 | ||
1156 | void | |
1157 | spa_activate_mos_feature(spa_t *spa, const char *feature, dmu_tx_t *tx) | |
1158 | { | |
1159 | if (!nvlist_exists(spa->spa_label_features, feature)) { | |
1160 | fnvlist_add_boolean(spa->spa_label_features, feature); | |
1161 | /* | |
1162 | * When we are creating the pool (tx_txg==TXG_INITIAL), we can't | |
1163 | * dirty the vdev config because lock SCL_CONFIG is not held. | |
1164 | * Thankfully, in this case we don't need to dirty the config | |
1165 | * because it will be written out anyway when we finish | |
1166 | * creating the pool. | |
1167 | */ | |
1168 | if (tx->tx_txg != TXG_INITIAL) | |
1169 | vdev_config_dirty(spa->spa_root_vdev); | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | void | |
1174 | spa_deactivate_mos_feature(spa_t *spa, const char *feature) | |
1175 | { | |
1176 | if (nvlist_remove_all(spa->spa_label_features, feature) == 0) | |
1177 | vdev_config_dirty(spa->spa_root_vdev); | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Rename a spa_t. | |
1182 | */ | |
1183 | int | |
1184 | spa_rename(const char *name, const char *newname) | |
1185 | { | |
1186 | spa_t *spa; | |
1187 | int err; | |
1188 | ||
1189 | /* | |
1190 | * Lookup the spa_t and grab the config lock for writing. We need to | |
1191 | * actually open the pool so that we can sync out the necessary labels. | |
1192 | * It's OK to call spa_open() with the namespace lock held because we | |
1193 | * allow recursive calls for other reasons. | |
1194 | */ | |
1195 | mutex_enter(&spa_namespace_lock); | |
1196 | if ((err = spa_open(name, &spa, FTAG)) != 0) { | |
1197 | mutex_exit(&spa_namespace_lock); | |
1198 | return (err); | |
1199 | } | |
1200 | ||
1201 | spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); | |
1202 | ||
1203 | avl_remove(&spa_namespace_avl, spa); | |
1204 | (void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name)); | |
1205 | avl_add(&spa_namespace_avl, spa); | |
1206 | ||
1207 | /* | |
1208 | * Sync all labels to disk with the new names by marking the root vdev | |
1209 | * dirty and waiting for it to sync. It will pick up the new pool name | |
1210 | * during the sync. | |
1211 | */ | |
1212 | vdev_config_dirty(spa->spa_root_vdev); | |
1213 | ||
1214 | spa_config_exit(spa, SCL_ALL, FTAG); | |
1215 | ||
1216 | txg_wait_synced(spa->spa_dsl_pool, 0); | |
1217 | ||
1218 | /* | |
1219 | * Sync the updated config cache. | |
1220 | */ | |
1221 | spa_config_sync(spa, B_FALSE, B_TRUE); | |
1222 | ||
1223 | spa_close(spa, FTAG); | |
1224 | ||
1225 | mutex_exit(&spa_namespace_lock); | |
1226 | ||
1227 | return (0); | |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Return the spa_t associated with given pool_guid, if it exists. If | |
1232 | * device_guid is non-zero, determine whether the pool exists *and* contains | |
1233 | * a device with the specified device_guid. | |
1234 | */ | |
1235 | spa_t * | |
1236 | spa_by_guid(uint64_t pool_guid, uint64_t device_guid) | |
1237 | { | |
1238 | spa_t *spa; | |
1239 | avl_tree_t *t = &spa_namespace_avl; | |
1240 | ||
1241 | ASSERT(MUTEX_HELD(&spa_namespace_lock)); | |
1242 | ||
1243 | for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) { | |
1244 | if (spa->spa_state == POOL_STATE_UNINITIALIZED) | |
1245 | continue; | |
1246 | if (spa->spa_root_vdev == NULL) | |
1247 | continue; | |
1248 | if (spa_guid(spa) == pool_guid) { | |
1249 | if (device_guid == 0) | |
1250 | break; | |
1251 | ||
1252 | if (vdev_lookup_by_guid(spa->spa_root_vdev, | |
1253 | device_guid) != NULL) | |
1254 | break; | |
1255 | ||
1256 | /* | |
1257 | * Check any devices we may be in the process of adding. | |
1258 | */ | |
1259 | if (spa->spa_pending_vdev) { | |
1260 | if (vdev_lookup_by_guid(spa->spa_pending_vdev, | |
1261 | device_guid) != NULL) | |
1262 | break; | |
1263 | } | |
1264 | } | |
1265 | } | |
1266 | ||
1267 | return (spa); | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Determine whether a pool with the given pool_guid exists. | |
1272 | */ | |
1273 | boolean_t | |
1274 | spa_guid_exists(uint64_t pool_guid, uint64_t device_guid) | |
1275 | { | |
1276 | return (spa_by_guid(pool_guid, device_guid) != NULL); | |
1277 | } | |
1278 | ||
1279 | char * | |
1280 | spa_strdup(const char *s) | |
1281 | { | |
1282 | size_t len; | |
1283 | char *new; | |
1284 | ||
1285 | len = strlen(s); | |
1286 | new = kmem_alloc(len + 1, KM_SLEEP); | |
1287 | bcopy(s, new, len); | |
1288 | new[len] = '\0'; | |
1289 | ||
1290 | return (new); | |
1291 | } | |
1292 | ||
1293 | void | |
1294 | spa_strfree(char *s) | |
1295 | { | |
1296 | kmem_free(s, strlen(s) + 1); | |
1297 | } | |
1298 | ||
1299 | uint64_t | |
1300 | spa_get_random(uint64_t range) | |
1301 | { | |
1302 | uint64_t r; | |
1303 | ||
1304 | ASSERT(range != 0); | |
1305 | ||
1306 | (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t)); | |
1307 | ||
1308 | return (r % range); | |
1309 | } | |
1310 | ||
1311 | uint64_t | |
1312 | spa_generate_guid(spa_t *spa) | |
1313 | { | |
1314 | uint64_t guid = spa_get_random(-1ULL); | |
1315 | ||
1316 | if (spa != NULL) { | |
1317 | while (guid == 0 || spa_guid_exists(spa_guid(spa), guid)) | |
1318 | guid = spa_get_random(-1ULL); | |
1319 | } else { | |
1320 | while (guid == 0 || spa_guid_exists(guid, 0)) | |
1321 | guid = spa_get_random(-1ULL); | |
1322 | } | |
1323 | ||
1324 | return (guid); | |
1325 | } | |
1326 | ||
1327 | void | |
1328 | snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp) | |
1329 | { | |
1330 | char type[256]; | |
1331 | char *checksum = NULL; | |
1332 | char *compress = NULL; | |
1333 | ||
1334 | if (bp != NULL) { | |
1335 | if (BP_GET_TYPE(bp) & DMU_OT_NEWTYPE) { | |
1336 | dmu_object_byteswap_t bswap = | |
1337 | DMU_OT_BYTESWAP(BP_GET_TYPE(bp)); | |
1338 | (void) snprintf(type, sizeof (type), "bswap %s %s", | |
1339 | DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) ? | |
1340 | "metadata" : "data", | |
1341 | dmu_ot_byteswap[bswap].ob_name); | |
1342 | } else { | |
1343 | (void) strlcpy(type, dmu_ot[BP_GET_TYPE(bp)].ot_name, | |
1344 | sizeof (type)); | |
1345 | } | |
1346 | if (!BP_IS_EMBEDDED(bp)) { | |
1347 | checksum = | |
1348 | zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name; | |
1349 | } | |
1350 | compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name; | |
1351 | } | |
1352 | ||
1353 | SNPRINTF_BLKPTR(snprintf, ' ', buf, buflen, bp, type, checksum, | |
1354 | compress); | |
1355 | } | |
1356 | ||
1357 | void | |
1358 | spa_freeze(spa_t *spa) | |
1359 | { | |
1360 | uint64_t freeze_txg = 0; | |
1361 | ||
1362 | spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); | |
1363 | if (spa->spa_freeze_txg == UINT64_MAX) { | |
1364 | freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE; | |
1365 | spa->spa_freeze_txg = freeze_txg; | |
1366 | } | |
1367 | spa_config_exit(spa, SCL_ALL, FTAG); | |
1368 | if (freeze_txg != 0) | |
1369 | txg_wait_synced(spa_get_dsl(spa), freeze_txg); | |
1370 | } | |
1371 | ||
1372 | void | |
1373 | zfs_panic_recover(const char *fmt, ...) | |
1374 | { | |
1375 | va_list adx; | |
1376 | ||
1377 | va_start(adx, fmt); | |
1378 | vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx); | |
1379 | va_end(adx); | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * This is a stripped-down version of strtoull, suitable only for converting | |
1384 | * lowercase hexadecimal numbers that don't overflow. | |
1385 | */ | |
1386 | uint64_t | |
1387 | strtonum(const char *str, char **nptr) | |
1388 | { | |
1389 | uint64_t val = 0; | |
1390 | char c; | |
1391 | int digit; | |
1392 | ||
1393 | while ((c = *str) != '\0') { | |
1394 | if (c >= '0' && c <= '9') | |
1395 | digit = c - '0'; | |
1396 | else if (c >= 'a' && c <= 'f') | |
1397 | digit = 10 + c - 'a'; | |
1398 | else | |
1399 | break; | |
1400 | ||
1401 | val *= 16; | |
1402 | val += digit; | |
1403 | ||
1404 | str++; | |
1405 | } | |
1406 | ||
1407 | if (nptr) | |
1408 | *nptr = (char *)str; | |
1409 | ||
1410 | return (val); | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * ========================================================================== | |
1415 | * Accessor functions | |
1416 | * ========================================================================== | |
1417 | */ | |
1418 | ||
1419 | boolean_t | |
1420 | spa_shutting_down(spa_t *spa) | |
1421 | { | |
1422 | return (spa->spa_async_suspended); | |
1423 | } | |
1424 | ||
1425 | dsl_pool_t * | |
1426 | spa_get_dsl(spa_t *spa) | |
1427 | { | |
1428 | return (spa->spa_dsl_pool); | |
1429 | } | |
1430 | ||
1431 | boolean_t | |
1432 | spa_is_initializing(spa_t *spa) | |
1433 | { | |
1434 | return (spa->spa_is_initializing); | |
1435 | } | |
1436 | ||
1437 | blkptr_t * | |
1438 | spa_get_rootblkptr(spa_t *spa) | |
1439 | { | |
1440 | return (&spa->spa_ubsync.ub_rootbp); | |
1441 | } | |
1442 | ||
1443 | void | |
1444 | spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp) | |
1445 | { | |
1446 | spa->spa_uberblock.ub_rootbp = *bp; | |
1447 | } | |
1448 | ||
1449 | void | |
1450 | spa_altroot(spa_t *spa, char *buf, size_t buflen) | |
1451 | { | |
1452 | if (spa->spa_root == NULL) | |
1453 | buf[0] = '\0'; | |
1454 | else | |
1455 | (void) strncpy(buf, spa->spa_root, buflen); | |
1456 | } | |
1457 | ||
1458 | int | |
1459 | spa_sync_pass(spa_t *spa) | |
1460 | { | |
1461 | return (spa->spa_sync_pass); | |
1462 | } | |
1463 | ||
1464 | char * | |
1465 | spa_name(spa_t *spa) | |
1466 | { | |
1467 | return (spa->spa_name); | |
1468 | } | |
1469 | ||
1470 | uint64_t | |
1471 | spa_guid(spa_t *spa) | |
1472 | { | |
1473 | dsl_pool_t *dp = spa_get_dsl(spa); | |
1474 | uint64_t guid; | |
1475 | ||
1476 | /* | |
1477 | * If we fail to parse the config during spa_load(), we can go through | |
1478 | * the error path (which posts an ereport) and end up here with no root | |
1479 | * vdev. We stash the original pool guid in 'spa_config_guid' to handle | |
1480 | * this case. | |
1481 | */ | |
1482 | if (spa->spa_root_vdev == NULL) | |
1483 | return (spa->spa_config_guid); | |
1484 | ||
1485 | guid = spa->spa_last_synced_guid != 0 ? | |
1486 | spa->spa_last_synced_guid : spa->spa_root_vdev->vdev_guid; | |
1487 | ||
1488 | /* | |
1489 | * Return the most recently synced out guid unless we're | |
1490 | * in syncing context. | |
1491 | */ | |
1492 | if (dp && dsl_pool_sync_context(dp)) | |
1493 | return (spa->spa_root_vdev->vdev_guid); | |
1494 | else | |
1495 | return (guid); | |
1496 | } | |
1497 | ||
1498 | uint64_t | |
1499 | spa_load_guid(spa_t *spa) | |
1500 | { | |
1501 | /* | |
1502 | * This is a GUID that exists solely as a reference for the | |
1503 | * purposes of the arc. It is generated at load time, and | |
1504 | * is never written to persistent storage. | |
1505 | */ | |
1506 | return (spa->spa_load_guid); | |
1507 | } | |
1508 | ||
1509 | uint64_t | |
1510 | spa_last_synced_txg(spa_t *spa) | |
1511 | { | |
1512 | return (spa->spa_ubsync.ub_txg); | |
1513 | } | |
1514 | ||
1515 | uint64_t | |
1516 | spa_first_txg(spa_t *spa) | |
1517 | { | |
1518 | return (spa->spa_first_txg); | |
1519 | } | |
1520 | ||
1521 | uint64_t | |
1522 | spa_syncing_txg(spa_t *spa) | |
1523 | { | |
1524 | return (spa->spa_syncing_txg); | |
1525 | } | |
1526 | ||
1527 | pool_state_t | |
1528 | spa_state(spa_t *spa) | |
1529 | { | |
1530 | return (spa->spa_state); | |
1531 | } | |
1532 | ||
1533 | spa_load_state_t | |
1534 | spa_load_state(spa_t *spa) | |
1535 | { | |
1536 | return (spa->spa_load_state); | |
1537 | } | |
1538 | ||
1539 | uint64_t | |
1540 | spa_freeze_txg(spa_t *spa) | |
1541 | { | |
1542 | return (spa->spa_freeze_txg); | |
1543 | } | |
1544 | ||
1545 | /* ARGSUSED */ | |
1546 | uint64_t | |
1547 | spa_get_asize(spa_t *spa, uint64_t lsize) | |
1548 | { | |
1549 | return (lsize * spa_asize_inflation); | |
1550 | } | |
1551 | ||
1552 | uint64_t | |
1553 | spa_get_dspace(spa_t *spa) | |
1554 | { | |
1555 | return (spa->spa_dspace); | |
1556 | } | |
1557 | ||
1558 | void | |
1559 | spa_update_dspace(spa_t *spa) | |
1560 | { | |
1561 | spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) + | |
1562 | ddt_get_dedup_dspace(spa); | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | * Return the failure mode that has been set to this pool. The default | |
1567 | * behavior will be to block all I/Os when a complete failure occurs. | |
1568 | */ | |
1569 | uint8_t | |
1570 | spa_get_failmode(spa_t *spa) | |
1571 | { | |
1572 | return (spa->spa_failmode); | |
1573 | } | |
1574 | ||
1575 | boolean_t | |
1576 | spa_suspended(spa_t *spa) | |
1577 | { | |
1578 | return (spa->spa_suspended); | |
1579 | } | |
1580 | ||
1581 | uint64_t | |
1582 | spa_version(spa_t *spa) | |
1583 | { | |
1584 | return (spa->spa_ubsync.ub_version); | |
1585 | } | |
1586 | ||
1587 | boolean_t | |
1588 | spa_deflate(spa_t *spa) | |
1589 | { | |
1590 | return (spa->spa_deflate); | |
1591 | } | |
1592 | ||
1593 | metaslab_class_t * | |
1594 | spa_normal_class(spa_t *spa) | |
1595 | { | |
1596 | return (spa->spa_normal_class); | |
1597 | } | |
1598 | ||
1599 | metaslab_class_t * | |
1600 | spa_log_class(spa_t *spa) | |
1601 | { | |
1602 | return (spa->spa_log_class); | |
1603 | } | |
1604 | ||
1605 | int | |
1606 | spa_max_replication(spa_t *spa) | |
1607 | { | |
1608 | /* | |
1609 | * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to | |
1610 | * handle BPs with more than one DVA allocated. Set our max | |
1611 | * replication level accordingly. | |
1612 | */ | |
1613 | if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS) | |
1614 | return (1); | |
1615 | return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override)); | |
1616 | } | |
1617 | ||
1618 | int | |
1619 | spa_prev_software_version(spa_t *spa) | |
1620 | { | |
1621 | return (spa->spa_prev_software_version); | |
1622 | } | |
1623 | ||
1624 | uint64_t | |
1625 | spa_deadman_synctime(spa_t *spa) | |
1626 | { | |
1627 | return (spa->spa_deadman_synctime); | |
1628 | } | |
1629 | ||
1630 | uint64_t | |
1631 | dva_get_dsize_sync(spa_t *spa, const dva_t *dva) | |
1632 | { | |
1633 | uint64_t asize = DVA_GET_ASIZE(dva); | |
1634 | uint64_t dsize = asize; | |
1635 | ||
1636 | ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); | |
1637 | ||
1638 | if (asize != 0 && spa->spa_deflate) { | |
1639 | vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva)); | |
1640 | if (vd != NULL) | |
1641 | dsize = (asize >> SPA_MINBLOCKSHIFT) * | |
1642 | vd->vdev_deflate_ratio; | |
1643 | } | |
1644 | ||
1645 | return (dsize); | |
1646 | } | |
1647 | ||
1648 | uint64_t | |
1649 | bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp) | |
1650 | { | |
1651 | uint64_t dsize = 0; | |
1652 | int d; | |
1653 | ||
1654 | for (d = 0; d < BP_GET_NDVAS(bp); d++) | |
1655 | dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]); | |
1656 | ||
1657 | return (dsize); | |
1658 | } | |
1659 | ||
1660 | uint64_t | |
1661 | bp_get_dsize(spa_t *spa, const blkptr_t *bp) | |
1662 | { | |
1663 | uint64_t dsize = 0; | |
1664 | int d; | |
1665 | ||
1666 | spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); | |
1667 | ||
1668 | for (d = 0; d < BP_GET_NDVAS(bp); d++) | |
1669 | dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]); | |
1670 | ||
1671 | spa_config_exit(spa, SCL_VDEV, FTAG); | |
1672 | ||
1673 | return (dsize); | |
1674 | } | |
1675 | ||
1676 | /* | |
1677 | * ========================================================================== | |
1678 | * Initialization and Termination | |
1679 | * ========================================================================== | |
1680 | */ | |
1681 | ||
1682 | static int | |
1683 | spa_name_compare(const void *a1, const void *a2) | |
1684 | { | |
1685 | const spa_t *s1 = a1; | |
1686 | const spa_t *s2 = a2; | |
1687 | int s; | |
1688 | ||
1689 | s = strcmp(s1->spa_name, s2->spa_name); | |
1690 | if (s > 0) | |
1691 | return (1); | |
1692 | if (s < 0) | |
1693 | return (-1); | |
1694 | return (0); | |
1695 | } | |
1696 | ||
1697 | void | |
1698 | spa_boot_init(void) | |
1699 | { | |
1700 | spa_config_load(); | |
1701 | } | |
1702 | ||
1703 | void | |
1704 | spa_init(int mode) | |
1705 | { | |
1706 | mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL); | |
1707 | mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL); | |
1708 | mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL); | |
1709 | cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL); | |
1710 | ||
1711 | avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t), | |
1712 | offsetof(spa_t, spa_avl)); | |
1713 | ||
1714 | avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t), | |
1715 | offsetof(spa_aux_t, aux_avl)); | |
1716 | ||
1717 | avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t), | |
1718 | offsetof(spa_aux_t, aux_avl)); | |
1719 | ||
1720 | spa_mode_global = mode; | |
1721 | ||
1722 | #ifndef _KERNEL | |
1723 | if (spa_mode_global != FREAD && dprintf_find_string("watch")) { | |
1724 | struct sigaction sa; | |
1725 | ||
1726 | sa.sa_flags = SA_SIGINFO; | |
1727 | sigemptyset(&sa.sa_mask); | |
1728 | sa.sa_sigaction = arc_buf_sigsegv; | |
1729 | ||
1730 | if (sigaction(SIGSEGV, &sa, NULL) == -1) { | |
1731 | perror("could not enable watchpoints: " | |
1732 | "sigaction(SIGSEGV, ...) = "); | |
1733 | } else { | |
1734 | arc_watch = B_TRUE; | |
1735 | } | |
1736 | } | |
1737 | #endif | |
1738 | ||
1739 | fm_init(); | |
1740 | refcount_init(); | |
1741 | unique_init(); | |
1742 | range_tree_init(); | |
1743 | ddt_init(); | |
1744 | zio_init(); | |
1745 | dmu_init(); | |
1746 | zil_init(); | |
1747 | vdev_cache_stat_init(); | |
1748 | vdev_file_init(); | |
1749 | zfs_prop_init(); | |
1750 | zpool_prop_init(); | |
1751 | zpool_feature_init(); | |
1752 | spa_config_load(); | |
1753 | l2arc_start(); | |
1754 | } | |
1755 | ||
1756 | void | |
1757 | spa_fini(void) | |
1758 | { | |
1759 | l2arc_stop(); | |
1760 | ||
1761 | spa_evict_all(); | |
1762 | ||
1763 | vdev_file_fini(); | |
1764 | vdev_cache_stat_fini(); | |
1765 | zil_fini(); | |
1766 | dmu_fini(); | |
1767 | zio_fini(); | |
1768 | ddt_fini(); | |
1769 | range_tree_fini(); | |
1770 | unique_fini(); | |
1771 | refcount_fini(); | |
1772 | fm_fini(); | |
1773 | ||
1774 | avl_destroy(&spa_namespace_avl); | |
1775 | avl_destroy(&spa_spare_avl); | |
1776 | avl_destroy(&spa_l2cache_avl); | |
1777 | ||
1778 | cv_destroy(&spa_namespace_cv); | |
1779 | mutex_destroy(&spa_namespace_lock); | |
1780 | mutex_destroy(&spa_spare_lock); | |
1781 | mutex_destroy(&spa_l2cache_lock); | |
1782 | } | |
1783 | ||
1784 | /* | |
1785 | * Return whether this pool has slogs. No locking needed. | |
1786 | * It's not a problem if the wrong answer is returned as it's only for | |
1787 | * performance and not correctness | |
1788 | */ | |
1789 | boolean_t | |
1790 | spa_has_slogs(spa_t *spa) | |
1791 | { | |
1792 | return (spa->spa_log_class->mc_rotor != NULL); | |
1793 | } | |
1794 | ||
1795 | spa_log_state_t | |
1796 | spa_get_log_state(spa_t *spa) | |
1797 | { | |
1798 | return (spa->spa_log_state); | |
1799 | } | |
1800 | ||
1801 | void | |
1802 | spa_set_log_state(spa_t *spa, spa_log_state_t state) | |
1803 | { | |
1804 | spa->spa_log_state = state; | |
1805 | } | |
1806 | ||
1807 | boolean_t | |
1808 | spa_is_root(spa_t *spa) | |
1809 | { | |
1810 | return (spa->spa_is_root); | |
1811 | } | |
1812 | ||
1813 | boolean_t | |
1814 | spa_writeable(spa_t *spa) | |
1815 | { | |
1816 | return (!!(spa->spa_mode & FWRITE)); | |
1817 | } | |
1818 | ||
1819 | /* | |
1820 | * Returns true if there is a pending sync task in any of the current | |
1821 | * syncing txg, the current quiescing txg, or the current open txg. | |
1822 | */ | |
1823 | boolean_t | |
1824 | spa_has_pending_synctask(spa_t *spa) | |
1825 | { | |
1826 | return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks)); | |
1827 | } | |
1828 | ||
1829 | int | |
1830 | spa_mode(spa_t *spa) | |
1831 | { | |
1832 | return (spa->spa_mode); | |
1833 | } | |
1834 | ||
1835 | uint64_t | |
1836 | spa_bootfs(spa_t *spa) | |
1837 | { | |
1838 | return (spa->spa_bootfs); | |
1839 | } | |
1840 | ||
1841 | uint64_t | |
1842 | spa_delegation(spa_t *spa) | |
1843 | { | |
1844 | return (spa->spa_delegation); | |
1845 | } | |
1846 | ||
1847 | objset_t * | |
1848 | spa_meta_objset(spa_t *spa) | |
1849 | { | |
1850 | return (spa->spa_meta_objset); | |
1851 | } | |
1852 | ||
1853 | enum zio_checksum | |
1854 | spa_dedup_checksum(spa_t *spa) | |
1855 | { | |
1856 | return (spa->spa_dedup_checksum); | |
1857 | } | |
1858 | ||
1859 | /* | |
1860 | * Reset pool scan stat per scan pass (or reboot). | |
1861 | */ | |
1862 | void | |
1863 | spa_scan_stat_init(spa_t *spa) | |
1864 | { | |
1865 | /* data not stored on disk */ | |
1866 | spa->spa_scan_pass_start = gethrestime_sec(); | |
1867 | spa->spa_scan_pass_exam = 0; | |
1868 | vdev_scan_stat_init(spa->spa_root_vdev); | |
1869 | } | |
1870 | ||
1871 | /* | |
1872 | * Get scan stats for zpool status reports | |
1873 | */ | |
1874 | int | |
1875 | spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps) | |
1876 | { | |
1877 | dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL; | |
1878 | ||
1879 | if (scn == NULL || scn->scn_phys.scn_func == POOL_SCAN_NONE) | |
1880 | return (SET_ERROR(ENOENT)); | |
1881 | bzero(ps, sizeof (pool_scan_stat_t)); | |
1882 | ||
1883 | /* data stored on disk */ | |
1884 | ps->pss_func = scn->scn_phys.scn_func; | |
1885 | ps->pss_start_time = scn->scn_phys.scn_start_time; | |
1886 | ps->pss_end_time = scn->scn_phys.scn_end_time; | |
1887 | ps->pss_to_examine = scn->scn_phys.scn_to_examine; | |
1888 | ps->pss_examined = scn->scn_phys.scn_examined; | |
1889 | ps->pss_to_process = scn->scn_phys.scn_to_process; | |
1890 | ps->pss_processed = scn->scn_phys.scn_processed; | |
1891 | ps->pss_errors = scn->scn_phys.scn_errors; | |
1892 | ps->pss_state = scn->scn_phys.scn_state; | |
1893 | ||
1894 | /* data not stored on disk */ | |
1895 | ps->pss_pass_start = spa->spa_scan_pass_start; | |
1896 | ps->pss_pass_exam = spa->spa_scan_pass_exam; | |
1897 | ||
1898 | return (0); | |
1899 | } | |
1900 | ||
1901 | boolean_t | |
1902 | spa_debug_enabled(spa_t *spa) | |
1903 | { | |
1904 | return (spa->spa_debug); | |
1905 | } | |
1906 | ||
1907 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
1908 | /* Namespace manipulation */ | |
1909 | EXPORT_SYMBOL(spa_lookup); | |
1910 | EXPORT_SYMBOL(spa_add); | |
1911 | EXPORT_SYMBOL(spa_remove); | |
1912 | EXPORT_SYMBOL(spa_next); | |
1913 | ||
1914 | /* Refcount functions */ | |
1915 | EXPORT_SYMBOL(spa_open_ref); | |
1916 | EXPORT_SYMBOL(spa_close); | |
1917 | EXPORT_SYMBOL(spa_refcount_zero); | |
1918 | ||
1919 | /* Pool configuration lock */ | |
1920 | EXPORT_SYMBOL(spa_config_tryenter); | |
1921 | EXPORT_SYMBOL(spa_config_enter); | |
1922 | EXPORT_SYMBOL(spa_config_exit); | |
1923 | EXPORT_SYMBOL(spa_config_held); | |
1924 | ||
1925 | /* Pool vdev add/remove lock */ | |
1926 | EXPORT_SYMBOL(spa_vdev_enter); | |
1927 | EXPORT_SYMBOL(spa_vdev_exit); | |
1928 | ||
1929 | /* Pool vdev state change lock */ | |
1930 | EXPORT_SYMBOL(spa_vdev_state_enter); | |
1931 | EXPORT_SYMBOL(spa_vdev_state_exit); | |
1932 | ||
1933 | /* Accessor functions */ | |
1934 | EXPORT_SYMBOL(spa_shutting_down); | |
1935 | EXPORT_SYMBOL(spa_get_dsl); | |
1936 | EXPORT_SYMBOL(spa_get_rootblkptr); | |
1937 | EXPORT_SYMBOL(spa_set_rootblkptr); | |
1938 | EXPORT_SYMBOL(spa_altroot); | |
1939 | EXPORT_SYMBOL(spa_sync_pass); | |
1940 | EXPORT_SYMBOL(spa_name); | |
1941 | EXPORT_SYMBOL(spa_guid); | |
1942 | EXPORT_SYMBOL(spa_last_synced_txg); | |
1943 | EXPORT_SYMBOL(spa_first_txg); | |
1944 | EXPORT_SYMBOL(spa_syncing_txg); | |
1945 | EXPORT_SYMBOL(spa_version); | |
1946 | EXPORT_SYMBOL(spa_state); | |
1947 | EXPORT_SYMBOL(spa_load_state); | |
1948 | EXPORT_SYMBOL(spa_freeze_txg); | |
1949 | EXPORT_SYMBOL(spa_get_asize); | |
1950 | EXPORT_SYMBOL(spa_get_dspace); | |
1951 | EXPORT_SYMBOL(spa_update_dspace); | |
1952 | EXPORT_SYMBOL(spa_deflate); | |
1953 | EXPORT_SYMBOL(spa_normal_class); | |
1954 | EXPORT_SYMBOL(spa_log_class); | |
1955 | EXPORT_SYMBOL(spa_max_replication); | |
1956 | EXPORT_SYMBOL(spa_prev_software_version); | |
1957 | EXPORT_SYMBOL(spa_get_failmode); | |
1958 | EXPORT_SYMBOL(spa_suspended); | |
1959 | EXPORT_SYMBOL(spa_bootfs); | |
1960 | EXPORT_SYMBOL(spa_delegation); | |
1961 | EXPORT_SYMBOL(spa_meta_objset); | |
1962 | ||
1963 | /* Miscellaneous support routines */ | |
1964 | EXPORT_SYMBOL(spa_rename); | |
1965 | EXPORT_SYMBOL(spa_guid_exists); | |
1966 | EXPORT_SYMBOL(spa_strdup); | |
1967 | EXPORT_SYMBOL(spa_strfree); | |
1968 | EXPORT_SYMBOL(spa_get_random); | |
1969 | EXPORT_SYMBOL(spa_generate_guid); | |
1970 | EXPORT_SYMBOL(snprintf_blkptr); | |
1971 | EXPORT_SYMBOL(spa_freeze); | |
1972 | EXPORT_SYMBOL(spa_upgrade); | |
1973 | EXPORT_SYMBOL(spa_evict_all); | |
1974 | EXPORT_SYMBOL(spa_lookup_by_guid); | |
1975 | EXPORT_SYMBOL(spa_has_spare); | |
1976 | EXPORT_SYMBOL(dva_get_dsize_sync); | |
1977 | EXPORT_SYMBOL(bp_get_dsize_sync); | |
1978 | EXPORT_SYMBOL(bp_get_dsize); | |
1979 | EXPORT_SYMBOL(spa_has_slogs); | |
1980 | EXPORT_SYMBOL(spa_is_root); | |
1981 | EXPORT_SYMBOL(spa_writeable); | |
1982 | EXPORT_SYMBOL(spa_mode); | |
1983 | ||
1984 | EXPORT_SYMBOL(spa_namespace_lock); | |
1985 | ||
1986 | module_param(zfs_flags, uint, 0644); | |
1987 | MODULE_PARM_DESC(zfs_flags, "Set additional debugging flags"); | |
1988 | ||
1989 | module_param(zfs_recover, int, 0644); | |
1990 | MODULE_PARM_DESC(zfs_recover, "Set to attempt to recover from fatal errors"); | |
1991 | ||
1992 | module_param(zfs_free_leak_on_eio, int, 0644); | |
1993 | MODULE_PARM_DESC(zfs_free_leak_on_eio, | |
1994 | "Set to ignore IO errors during free and permanently leak the space"); | |
1995 | ||
1996 | module_param(zfs_deadman_synctime_ms, ulong, 0644); | |
1997 | MODULE_PARM_DESC(zfs_deadman_synctime_ms, "Expiration time in milliseconds"); | |
1998 | ||
1999 | module_param(zfs_deadman_enabled, int, 0644); | |
2000 | MODULE_PARM_DESC(zfs_deadman_enabled, "Enable deadman timer"); | |
2001 | ||
2002 | module_param(spa_asize_inflation, int, 0644); | |
2003 | MODULE_PARM_DESC(spa_asize_inflation, | |
2004 | "SPA size estimate multiplication factor"); | |
2005 | #endif |