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, 2017 by Delphix. All rights reserved. 24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 26 * Copyright 2013 Saso Kiselkov. All rights reserved. 27 * Copyright (c) 2014 Integros [integros.com] 28 * Copyright (c) 2017 Datto Inc. 29 */ 30 31 #include <sys/zfs_context.h> 32 #include <sys/spa_impl.h> 33 #include <sys/spa_boot.h> 34 #include <sys/zio.h> 35 #include <sys/zio_checksum.h> 36 #include <sys/zio_compress.h> 37 #include <sys/dmu.h> 38 #include <sys/dmu_tx.h> 39 #include <sys/zap.h> 40 #include <sys/zil.h> 41 #include <sys/vdev_impl.h> 42 #include <sys/metaslab.h> 43 #include <sys/uberblock_impl.h> 44 #include <sys/txg.h> 45 #include <sys/avl.h> 46 #include <sys/unique.h> 47 #include <sys/dsl_pool.h> 48 #include <sys/dsl_dir.h> 49 #include <sys/dsl_prop.h> 50 #include <sys/dsl_scan.h> 51 #include <sys/fs/zfs.h> 52 #include <sys/metaslab_impl.h> 53 #include <sys/arc.h> 54 #include <sys/ddt.h> 55 #include "zfs_prop.h" 56 #include <sys/zfeature.h> 57 58 /* 59 * SPA locking 60 * 61 * There are four basic locks for managing spa_t structures: 62 * 63 * spa_namespace_lock (global mutex) 64 * 65 * This lock must be acquired to do any of the following: 66 * 67 * - Lookup a spa_t by name 68 * - Add or remove a spa_t from the namespace 69 * - Increase spa_refcount from non-zero 70 * - Check if spa_refcount is zero 71 * - Rename a spa_t 72 * - add/remove/attach/detach devices 73 * - Held for the duration of create/destroy/import/export 74 * 75 * It does not need to handle recursion. A create or destroy may 76 * reference objects (files or zvols) in other pools, but by 77 * definition they must have an existing reference, and will never need 78 * to lookup a spa_t by name. 79 * 80 * spa_refcount (per-spa refcount_t protected by mutex) 81 * 82 * This reference count keep track of any active users of the spa_t. The 83 * spa_t cannot be destroyed or freed while this is non-zero. Internally, 84 * the refcount is never really 'zero' - opening a pool implicitly keeps 85 * some references in the DMU. Internally we check against spa_minref, but 86 * present the image of a zero/non-zero value to consumers. 87 * 88 * spa_config_lock[] (per-spa array of rwlocks) 89 * 90 * This protects the spa_t from config changes, and must be held in 91 * the following circumstances: 92 * 93 * - RW_READER to perform I/O to the spa 94 * - RW_WRITER to change the vdev config 95 * 96 * The locking order is fairly straightforward: 97 * 98 * spa_namespace_lock -> spa_refcount 99 * 100 * The namespace lock must be acquired to increase the refcount from 0 101 * or to check if it is zero. 102 * 103 * spa_refcount -> spa_config_lock[] 104 * 105 * There must be at least one valid reference on the spa_t to acquire 106 * the config lock. 107 * 108 * spa_namespace_lock -> spa_config_lock[] 109 * 110 * The namespace lock must always be taken before the config lock. 111 * 112 * 113 * The spa_namespace_lock can be acquired directly and is globally visible. 114 * 115 * The namespace is manipulated using the following functions, all of which 116 * require the spa_namespace_lock to be held. 117 * 118 * spa_lookup() Lookup a spa_t by name. 119 * 120 * spa_add() Create a new spa_t in the namespace. 121 * 122 * spa_remove() Remove a spa_t from the namespace. This also 123 * frees up any memory associated with the spa_t. 124 * 125 * spa_next() Returns the next spa_t in the system, or the 126 * first if NULL is passed. 127 * 128 * spa_evict_all() Shutdown and remove all spa_t structures in 129 * the system. 130 * 131 * spa_guid_exists() Determine whether a pool/device guid exists. 132 * 133 * The spa_refcount is manipulated using the following functions: 134 * 135 * spa_open_ref() Adds a reference to the given spa_t. Must be 136 * called with spa_namespace_lock held if the 137 * refcount is currently zero. 138 * 139 * spa_close() Remove a reference from the spa_t. This will 140 * not free the spa_t or remove it from the 141 * namespace. No locking is required. 142 * 143 * spa_refcount_zero() Returns true if the refcount is currently 144 * zero. Must be called with spa_namespace_lock 145 * held. 146 * 147 * The spa_config_lock[] is an array of rwlocks, ordered as follows: 148 * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV. 149 * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}(). 150 * 151 * To read the configuration, it suffices to hold one of these locks as reader. 152 * To modify the configuration, you must hold all locks as writer. To modify 153 * vdev state without altering the vdev tree's topology (e.g. online/offline), 154 * you must hold SCL_STATE and SCL_ZIO as writer. 155 * 156 * We use these distinct config locks to avoid recursive lock entry. 157 * For example, spa_sync() (which holds SCL_CONFIG as reader) induces 158 * block allocations (SCL_ALLOC), which may require reading space maps 159 * from disk (dmu_read() -> zio_read() -> SCL_ZIO). 160 * 161 * The spa config locks cannot be normal rwlocks because we need the 162 * ability to hand off ownership. For example, SCL_ZIO is acquired 163 * by the issuing thread and later released by an interrupt thread. 164 * They do, however, obey the usual write-wanted semantics to prevent 165 * writer (i.e. system administrator) starvation. 166 * 167 * The lock acquisition rules are as follows: 168 * 169 * SCL_CONFIG 170 * Protects changes to the vdev tree topology, such as vdev 171 * add/remove/attach/detach. Protects the dirty config list 172 * (spa_config_dirty_list) and the set of spares and l2arc devices. 173 * 174 * SCL_STATE 175 * Protects changes to pool state and vdev state, such as vdev 176 * online/offline/fault/degrade/clear. Protects the dirty state list 177 * (spa_state_dirty_list) and global pool state (spa_state). 178 * 179 * SCL_ALLOC 180 * Protects changes to metaslab groups and classes. 181 * Held as reader by metaslab_alloc() and metaslab_claim(). 182 * 183 * SCL_ZIO 184 * Held by bp-level zios (those which have no io_vd upon entry) 185 * to prevent changes to the vdev tree. The bp-level zio implicitly 186 * protects all of its vdev child zios, which do not hold SCL_ZIO. 187 * 188 * SCL_FREE 189 * Protects changes to metaslab groups and classes. 190 * Held as reader by metaslab_free(). SCL_FREE is distinct from 191 * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free 192 * blocks in zio_done() while another i/o that holds either 193 * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete. 194 * 195 * SCL_VDEV 196 * Held as reader to prevent changes to the vdev tree during trivial 197 * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the 198 * other locks, and lower than all of them, to ensure that it's safe 199 * to acquire regardless of caller context. 200 * 201 * In addition, the following rules apply: 202 * 203 * (a) spa_props_lock protects pool properties, spa_config and spa_config_list. 204 * The lock ordering is SCL_CONFIG > spa_props_lock. 205 * 206 * (b) I/O operations on leaf vdevs. For any zio operation that takes 207 * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(), 208 * or zio_write_phys() -- the caller must ensure that the config cannot 209 * cannot change in the interim, and that the vdev cannot be reopened. 210 * SCL_STATE as reader suffices for both. 211 * 212 * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit(). 213 * 214 * spa_vdev_enter() Acquire the namespace lock and the config lock 215 * for writing. 216 * 217 * spa_vdev_exit() Release the config lock, wait for all I/O 218 * to complete, sync the updated configs to the 219 * cache, and release the namespace lock. 220 * 221 * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit(). 222 * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual 223 * locking is, always, based on spa_namespace_lock and spa_config_lock[]. 224 * 225 * spa_rename() is also implemented within this file since it requires 226 * manipulation of the namespace. 227 */ 228 229 static avl_tree_t spa_namespace_avl; 230 kmutex_t spa_namespace_lock; 231 static kcondvar_t spa_namespace_cv; 232 static int spa_active_count; 233 int spa_max_replication_override = SPA_DVAS_PER_BP; 234 235 static kmutex_t spa_spare_lock; 236 static avl_tree_t spa_spare_avl; 237 static kmutex_t spa_l2cache_lock; 238 static avl_tree_t spa_l2cache_avl; 239 240 kmem_cache_t *spa_buffer_pool; 241 int spa_mode_global; 242 243 #ifdef ZFS_DEBUG 244 /* 245 * Everything except dprintf, spa, and indirect_remap is on by default 246 * in debug builds. 247 */ 248 int zfs_flags = ~(ZFS_DEBUG_DPRINTF | ZFS_DEBUG_SPA | ZFS_DEBUG_INDIRECT_REMAP); 249 #else 250 int zfs_flags = 0; 251 #endif 252 253 /* 254 * zfs_recover can be set to nonzero to attempt to recover from 255 * otherwise-fatal errors, typically caused by on-disk corruption. When 256 * set, calls to zfs_panic_recover() will turn into warning messages. 257 * This should only be used as a last resort, as it typically results 258 * in leaked space, or worse. 259 */ 260 boolean_t zfs_recover = B_FALSE; 261 262 /* 263 * If destroy encounters an EIO while reading metadata (e.g. indirect 264 * blocks), space referenced by the missing metadata can not be freed. 265 * Normally this causes the background destroy to become "stalled", as 266 * it is unable to make forward progress. While in this stalled state, 267 * all remaining space to free from the error-encountering filesystem is 268 * "temporarily leaked". Set this flag to cause it to ignore the EIO, 269 * permanently leak the space from indirect blocks that can not be read, 270 * and continue to free everything else that it can. 271 * 272 * The default, "stalling" behavior is useful if the storage partially 273 * fails (i.e. some but not all i/os fail), and then later recovers. In 274 * this case, we will be able to continue pool operations while it is 275 * partially failed, and when it recovers, we can continue to free the 276 * space, with no leaks. However, note that this case is actually 277 * fairly rare. 278 * 279 * Typically pools either (a) fail completely (but perhaps temporarily, 280 * e.g. a top-level vdev going offline), or (b) have localized, 281 * permanent errors (e.g. disk returns the wrong data due to bit flip or 282 * firmware bug). In case (a), this setting does not matter because the 283 * pool will be suspended and the sync thread will not be able to make 284 * forward progress regardless. In case (b), because the error is 285 * permanent, the best we can do is leak the minimum amount of space, 286 * which is what setting this flag will do. Therefore, it is reasonable 287 * for this flag to normally be set, but we chose the more conservative 288 * approach of not setting it, so that there is no possibility of 289 * leaking space in the "partial temporary" failure case. 290 */ 291 boolean_t zfs_free_leak_on_eio = B_FALSE; 292 293 /* 294 * Expiration time in milliseconds. This value has two meanings. First it is 295 * used to determine when the spa_deadman() logic should fire. By default the 296 * spa_deadman() will fire if spa_sync() has not completed in 1000 seconds. 297 * Secondly, the value determines if an I/O is considered "hung". Any I/O that 298 * has not completed in zfs_deadman_synctime_ms is considered "hung" resulting 299 * in a system panic. 300 */ 301 uint64_t zfs_deadman_synctime_ms = 1000000ULL; 302 303 /* 304 * Check time in milliseconds. This defines the frequency at which we check 305 * for hung I/O. 306 */ 307 uint64_t zfs_deadman_checktime_ms = 5000ULL; 308 309 /* 310 * Override the zfs deadman behavior via /etc/system. By default the 311 * deadman is enabled except on VMware and sparc deployments. 312 */ 313 int zfs_deadman_enabled = -1; 314 315 /* 316 * The worst case is single-sector max-parity RAID-Z blocks, in which 317 * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1) 318 * times the size; so just assume that. Add to this the fact that 319 * we can have up to 3 DVAs per bp, and one more factor of 2 because 320 * the block may be dittoed with up to 3 DVAs by ddt_sync(). All together, 321 * the worst case is: 322 * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24 323 */ 324 int spa_asize_inflation = 24; 325 326 /* 327 * Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in 328 * the pool to be consumed. This ensures that we don't run the pool 329 * completely out of space, due to unaccounted changes (e.g. to the MOS). 330 * It also limits the worst-case time to allocate space. If we have 331 * less than this amount of free space, most ZPL operations (e.g. write, 332 * create) will return ENOSPC. 333 * 334 * Certain operations (e.g. file removal, most administrative actions) can 335 * use half the slop space. They will only return ENOSPC if less than half 336 * the slop space is free. Typically, once the pool has less than the slop 337 * space free, the user will use these operations to free up space in the pool. 338 * These are the operations that call dsl_pool_adjustedsize() with the netfree 339 * argument set to TRUE. 340 * 341 * Operations that are almost guaranteed to free up space in the absence of 342 * a pool checkpoint can use up to three quarters of the slop space 343 * (e.g zfs destroy). 344 * 345 * A very restricted set of operations are always permitted, regardless of 346 * the amount of free space. These are the operations that call 347 * dsl_sync_task(ZFS_SPACE_CHECK_NONE). If these operations result in a net 348 * increase in the amount of space used, it is possible to run the pool 349 * completely out of space, causing it to be permanently read-only. 350 * 351 * Note that on very small pools, the slop space will be larger than 352 * 3.2%, in an effort to have it be at least spa_min_slop (128MB), 353 * but we never allow it to be more than half the pool size. 354 * 355 * See also the comments in zfs_space_check_t. 356 */ 357 int spa_slop_shift = 5; 358 uint64_t spa_min_slop = 128 * 1024 * 1024; 359 360 /*PRINTFLIKE2*/ 361 void 362 spa_load_failed(spa_t *spa, const char *fmt, ...) 363 { 364 va_list adx; 365 char buf[256]; 366 367 va_start(adx, fmt); 368 (void) vsnprintf(buf, sizeof (buf), fmt, adx); 369 va_end(adx); 370 371 zfs_dbgmsg("spa_load(%s, config %s): FAILED: %s", spa->spa_name, 372 spa->spa_trust_config ? "trusted" : "untrusted", buf); 373 } 374 375 /*PRINTFLIKE2*/ 376 void 377 spa_load_note(spa_t *spa, const char *fmt, ...) 378 { 379 va_list adx; 380 char buf[256]; 381 382 va_start(adx, fmt); 383 (void) vsnprintf(buf, sizeof (buf), fmt, adx); 384 va_end(adx); 385 386 zfs_dbgmsg("spa_load(%s, config %s): %s", spa->spa_name, 387 spa->spa_trust_config ? "trusted" : "untrusted", buf); 388 } 389 390 /* 391 * ========================================================================== 392 * SPA config locking 393 * ========================================================================== 394 */ 395 static void 396 spa_config_lock_init(spa_t *spa) 397 { 398 for (int i = 0; i < SCL_LOCKS; i++) { 399 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 400 mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL); 401 cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL); 402 refcount_create_untracked(&scl->scl_count); 403 scl->scl_writer = NULL; 404 scl->scl_write_wanted = 0; 405 } 406 } 407 408 static void 409 spa_config_lock_destroy(spa_t *spa) 410 { 411 for (int i = 0; i < SCL_LOCKS; i++) { 412 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 413 mutex_destroy(&scl->scl_lock); 414 cv_destroy(&scl->scl_cv); 415 refcount_destroy(&scl->scl_count); 416 ASSERT(scl->scl_writer == NULL); 417 ASSERT(scl->scl_write_wanted == 0); 418 } 419 } 420 421 int 422 spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw) 423 { 424 for (int i = 0; i < SCL_LOCKS; i++) { 425 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 426 if (!(locks & (1 << i))) 427 continue; 428 mutex_enter(&scl->scl_lock); 429 if (rw == RW_READER) { 430 if (scl->scl_writer || scl->scl_write_wanted) { 431 mutex_exit(&scl->scl_lock); 432 spa_config_exit(spa, locks & ((1 << i) - 1), 433 tag); 434 return (0); 435 } 436 } else { 437 ASSERT(scl->scl_writer != curthread); 438 if (!refcount_is_zero(&scl->scl_count)) { 439 mutex_exit(&scl->scl_lock); 440 spa_config_exit(spa, locks & ((1 << i) - 1), 441 tag); 442 return (0); 443 } 444 scl->scl_writer = curthread; 445 } 446 (void) refcount_add(&scl->scl_count, tag); 447 mutex_exit(&scl->scl_lock); 448 } 449 return (1); 450 } 451 452 void 453 spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw) 454 { 455 int wlocks_held = 0; 456 457 ASSERT3U(SCL_LOCKS, <, sizeof (wlocks_held) * NBBY); 458 459 for (int i = 0; i < SCL_LOCKS; i++) { 460 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 461 if (scl->scl_writer == curthread) 462 wlocks_held |= (1 << i); 463 if (!(locks & (1 << i))) 464 continue; 465 mutex_enter(&scl->scl_lock); 466 if (rw == RW_READER) { 467 while (scl->scl_writer || scl->scl_write_wanted) { 468 cv_wait(&scl->scl_cv, &scl->scl_lock); 469 } 470 } else { 471 ASSERT(scl->scl_writer != curthread); 472 while (!refcount_is_zero(&scl->scl_count)) { 473 scl->scl_write_wanted++; 474 cv_wait(&scl->scl_cv, &scl->scl_lock); 475 scl->scl_write_wanted--; 476 } 477 scl->scl_writer = curthread; 478 } 479 (void) refcount_add(&scl->scl_count, tag); 480 mutex_exit(&scl->scl_lock); 481 } 482 ASSERT3U(wlocks_held, <=, locks); 483 } 484 485 void 486 spa_config_exit(spa_t *spa, int locks, void *tag) 487 { 488 for (int i = SCL_LOCKS - 1; i >= 0; i--) { 489 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 490 if (!(locks & (1 << i))) 491 continue; 492 mutex_enter(&scl->scl_lock); 493 ASSERT(!refcount_is_zero(&scl->scl_count)); 494 if (refcount_remove(&scl->scl_count, tag) == 0) { 495 ASSERT(scl->scl_writer == NULL || 496 scl->scl_writer == curthread); 497 scl->scl_writer = NULL; /* OK in either case */ 498 cv_broadcast(&scl->scl_cv); 499 } 500 mutex_exit(&scl->scl_lock); 501 } 502 } 503 504 int 505 spa_config_held(spa_t *spa, int locks, krw_t rw) 506 { 507 int locks_held = 0; 508 509 for (int i = 0; i < SCL_LOCKS; i++) { 510 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 511 if (!(locks & (1 << i))) 512 continue; 513 if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) || 514 (rw == RW_WRITER && scl->scl_writer == curthread)) 515 locks_held |= 1 << i; 516 } 517 518 return (locks_held); 519 } 520 521 /* 522 * ========================================================================== 523 * SPA namespace functions 524 * ========================================================================== 525 */ 526 527 /* 528 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held. 529 * Returns NULL if no matching spa_t is found. 530 */ 531 spa_t * 532 spa_lookup(const char *name) 533 { 534 static spa_t search; /* spa_t is large; don't allocate on stack */ 535 spa_t *spa; 536 avl_index_t where; 537 char *cp; 538 539 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 540 541 (void) strlcpy(search.spa_name, name, sizeof (search.spa_name)); 542 543 /* 544 * If it's a full dataset name, figure out the pool name and 545 * just use that. 546 */ 547 cp = strpbrk(search.spa_name, "/@#"); 548 if (cp != NULL) 549 *cp = '\0'; 550 551 spa = avl_find(&spa_namespace_avl, &search, &where); 552 553 return (spa); 554 } 555 556 /* 557 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms. 558 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues 559 * looking for potentially hung I/Os. 560 */ 561 void 562 spa_deadman(void *arg) 563 { 564 spa_t *spa = arg; 565 566 /* 567 * Disable the deadman timer if the pool is suspended. 568 */ 569 if (spa_suspended(spa)) { 570 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 571 return; 572 } 573 574 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu", 575 (gethrtime() - spa->spa_sync_starttime) / NANOSEC, 576 ++spa->spa_deadman_calls); 577 if (zfs_deadman_enabled) 578 vdev_deadman(spa->spa_root_vdev); 579 } 580 581 /* 582 * Create an uninitialized spa_t with the given name. Requires 583 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already 584 * exist by calling spa_lookup() first. 585 */ 586 spa_t * 587 spa_add(const char *name, nvlist_t *config, const char *altroot) 588 { 589 spa_t *spa; 590 spa_config_dirent_t *dp; 591 cyc_handler_t hdlr; 592 cyc_time_t when; 593 594 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 595 596 spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP); 597 598 mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL); 599 mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL); 600 mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL); 601 mutex_init(&spa->spa_evicting_os_lock, NULL, MUTEX_DEFAULT, NULL); 602 mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL); 603 mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL); 604 mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL); 605 mutex_init(&spa->spa_cksum_tmpls_lock, NULL, MUTEX_DEFAULT, NULL); 606 mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL); 607 mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL); 608 mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL); 609 mutex_init(&spa->spa_iokstat_lock, NULL, MUTEX_DEFAULT, NULL); 610 mutex_init(&spa->spa_alloc_lock, NULL, MUTEX_DEFAULT, NULL); 611 612 cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL); 613 cv_init(&spa->spa_evicting_os_cv, NULL, CV_DEFAULT, NULL); 614 cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL); 615 cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL); 616 cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL); 617 618 for (int t = 0; t < TXG_SIZE; t++) 619 bplist_create(&spa->spa_free_bplist[t]); 620 621 (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name)); 622 spa->spa_state = POOL_STATE_UNINITIALIZED; 623 spa->spa_freeze_txg = UINT64_MAX; 624 spa->spa_final_txg = UINT64_MAX; 625 spa->spa_load_max_txg = UINT64_MAX; 626 spa->spa_proc = &p0; 627 spa->spa_proc_state = SPA_PROC_NONE; 628 spa->spa_trust_config = B_TRUE; 629 630 hdlr.cyh_func = spa_deadman; 631 hdlr.cyh_arg = spa; 632 hdlr.cyh_level = CY_LOW_LEVEL; 633 634 spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime_ms); 635 636 /* 637 * This determines how often we need to check for hung I/Os after 638 * the cyclic has already fired. Since checking for hung I/Os is 639 * an expensive operation we don't want to check too frequently. 640 * Instead wait for 5 seconds before checking again. 641 */ 642 when.cyt_interval = MSEC2NSEC(zfs_deadman_checktime_ms); 643 when.cyt_when = CY_INFINITY; 644 mutex_enter(&cpu_lock); 645 spa->spa_deadman_cycid = cyclic_add(&hdlr, &when); 646 mutex_exit(&cpu_lock); 647 648 refcount_create(&spa->spa_refcount); 649 spa_config_lock_init(spa); 650 651 avl_add(&spa_namespace_avl, spa); 652 653 /* 654 * Set the alternate root, if there is one. 655 */ 656 if (altroot) { 657 spa->spa_root = spa_strdup(altroot); 658 spa_active_count++; 659 } 660 661 avl_create(&spa->spa_alloc_tree, zio_bookmark_compare, 662 sizeof (zio_t), offsetof(zio_t, io_alloc_node)); 663 664 /* 665 * Every pool starts with the default cachefile 666 */ 667 list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t), 668 offsetof(spa_config_dirent_t, scd_link)); 669 670 dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP); 671 dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path); 672 list_insert_head(&spa->spa_config_list, dp); 673 674 VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME, 675 KM_SLEEP) == 0); 676 677 if (config != NULL) { 678 nvlist_t *features; 679 680 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ, 681 &features) == 0) { 682 VERIFY(nvlist_dup(features, &spa->spa_label_features, 683 0) == 0); 684 } 685 686 VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0); 687 } 688 689 if (spa->spa_label_features == NULL) { 690 VERIFY(nvlist_alloc(&spa->spa_label_features, NV_UNIQUE_NAME, 691 KM_SLEEP) == 0); 692 } 693 694 spa->spa_iokstat = kstat_create("zfs", 0, name, 695 "disk", KSTAT_TYPE_IO, 1, 0); 696 if (spa->spa_iokstat) { 697 spa->spa_iokstat->ks_lock = &spa->spa_iokstat_lock; 698 kstat_install(spa->spa_iokstat); 699 } 700 701 spa->spa_debug = ((zfs_flags & ZFS_DEBUG_SPA) != 0); 702 703 spa->spa_min_ashift = INT_MAX; 704 spa->spa_max_ashift = 0; 705 706 /* 707 * As a pool is being created, treat all features as disabled by 708 * setting SPA_FEATURE_DISABLED for all entries in the feature 709 * refcount cache. 710 */ 711 for (int i = 0; i < SPA_FEATURES; i++) { 712 spa->spa_feat_refcount_cache[i] = SPA_FEATURE_DISABLED; 713 } 714 715 return (spa); 716 } 717 718 /* 719 * Removes a spa_t from the namespace, freeing up any memory used. Requires 720 * spa_namespace_lock. This is called only after the spa_t has been closed and 721 * deactivated. 722 */ 723 void 724 spa_remove(spa_t *spa) 725 { 726 spa_config_dirent_t *dp; 727 728 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 729 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 730 ASSERT3U(refcount_count(&spa->spa_refcount), ==, 0); 731 732 nvlist_free(spa->spa_config_splitting); 733 734 avl_remove(&spa_namespace_avl, spa); 735 cv_broadcast(&spa_namespace_cv); 736 737 if (spa->spa_root) { 738 spa_strfree(spa->spa_root); 739 spa_active_count--; 740 } 741 742 while ((dp = list_head(&spa->spa_config_list)) != NULL) { 743 list_remove(&spa->spa_config_list, dp); 744 if (dp->scd_path != NULL) 745 spa_strfree(dp->scd_path); 746 kmem_free(dp, sizeof (spa_config_dirent_t)); 747 } 748 749 avl_destroy(&spa->spa_alloc_tree); 750 list_destroy(&spa->spa_config_list); 751 752 nvlist_free(spa->spa_label_features); 753 nvlist_free(spa->spa_load_info); 754 spa_config_set(spa, NULL); 755 756 mutex_enter(&cpu_lock); 757 if (spa->spa_deadman_cycid != CYCLIC_NONE) 758 cyclic_remove(spa->spa_deadman_cycid); 759 mutex_exit(&cpu_lock); 760 spa->spa_deadman_cycid = CYCLIC_NONE; 761 762 refcount_destroy(&spa->spa_refcount); 763 764 spa_config_lock_destroy(spa); 765 766 kstat_delete(spa->spa_iokstat); 767 spa->spa_iokstat = NULL; 768 769 for (int t = 0; t < TXG_SIZE; t++) 770 bplist_destroy(&spa->spa_free_bplist[t]); 771 772 zio_checksum_templates_free(spa); 773 774 cv_destroy(&spa->spa_async_cv); 775 cv_destroy(&spa->spa_evicting_os_cv); 776 cv_destroy(&spa->spa_proc_cv); 777 cv_destroy(&spa->spa_scrub_io_cv); 778 cv_destroy(&spa->spa_suspend_cv); 779 780 mutex_destroy(&spa->spa_alloc_lock); 781 mutex_destroy(&spa->spa_async_lock); 782 mutex_destroy(&spa->spa_errlist_lock); 783 mutex_destroy(&spa->spa_errlog_lock); 784 mutex_destroy(&spa->spa_evicting_os_lock); 785 mutex_destroy(&spa->spa_history_lock); 786 mutex_destroy(&spa->spa_proc_lock); 787 mutex_destroy(&spa->spa_props_lock); 788 mutex_destroy(&spa->spa_cksum_tmpls_lock); 789 mutex_destroy(&spa->spa_scrub_lock); 790 mutex_destroy(&spa->spa_suspend_lock); 791 mutex_destroy(&spa->spa_vdev_top_lock); 792 mutex_destroy(&spa->spa_iokstat_lock); 793 794 kmem_free(spa, sizeof (spa_t)); 795 } 796 797 /* 798 * Given a pool, return the next pool in the namespace, or NULL if there is 799 * none. If 'prev' is NULL, return the first pool. 800 */ 801 spa_t * 802 spa_next(spa_t *prev) 803 { 804 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 805 806 if (prev) 807 return (AVL_NEXT(&spa_namespace_avl, prev)); 808 else 809 return (avl_first(&spa_namespace_avl)); 810 } 811 812 /* 813 * ========================================================================== 814 * SPA refcount functions 815 * ========================================================================== 816 */ 817 818 /* 819 * Add a reference to the given spa_t. Must have at least one reference, or 820 * have the namespace lock held. 821 */ 822 void 823 spa_open_ref(spa_t *spa, void *tag) 824 { 825 ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref || 826 MUTEX_HELD(&spa_namespace_lock)); 827 (void) refcount_add(&spa->spa_refcount, tag); 828 } 829 830 /* 831 * Remove a reference to the given spa_t. Must have at least one reference, or 832 * have the namespace lock held. 833 */ 834 void 835 spa_close(spa_t *spa, void *tag) 836 { 837 ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref || 838 MUTEX_HELD(&spa_namespace_lock)); 839 (void) refcount_remove(&spa->spa_refcount, tag); 840 } 841 842 /* 843 * Remove a reference to the given spa_t held by a dsl dir that is 844 * being asynchronously released. Async releases occur from a taskq 845 * performing eviction of dsl datasets and dirs. The namespace lock 846 * isn't held and the hold by the object being evicted may contribute to 847 * spa_minref (e.g. dataset or directory released during pool export), 848 * so the asserts in spa_close() do not apply. 849 */ 850 void 851 spa_async_close(spa_t *spa, void *tag) 852 { 853 (void) refcount_remove(&spa->spa_refcount, tag); 854 } 855 856 /* 857 * Check to see if the spa refcount is zero. Must be called with 858 * spa_namespace_lock held. We really compare against spa_minref, which is the 859 * number of references acquired when opening a pool 860 */ 861 boolean_t 862 spa_refcount_zero(spa_t *spa) 863 { 864 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 865 866 return (refcount_count(&spa->spa_refcount) == spa->spa_minref); 867 } 868 869 /* 870 * ========================================================================== 871 * SPA spare and l2cache tracking 872 * ========================================================================== 873 */ 874 875 /* 876 * Hot spares and cache devices are tracked using the same code below, 877 * for 'auxiliary' devices. 878 */ 879 880 typedef struct spa_aux { 881 uint64_t aux_guid; 882 uint64_t aux_pool; 883 avl_node_t aux_avl; 884 int aux_count; 885 } spa_aux_t; 886 887 static int 888 spa_aux_compare(const void *a, const void *b) 889 { 890 const spa_aux_t *sa = a; 891 const spa_aux_t *sb = b; 892 893 if (sa->aux_guid < sb->aux_guid) 894 return (-1); 895 else if (sa->aux_guid > sb->aux_guid) 896 return (1); 897 else 898 return (0); 899 } 900 901 void 902 spa_aux_add(vdev_t *vd, avl_tree_t *avl) 903 { 904 avl_index_t where; 905 spa_aux_t search; 906 spa_aux_t *aux; 907 908 search.aux_guid = vd->vdev_guid; 909 if ((aux = avl_find(avl, &search, &where)) != NULL) { 910 aux->aux_count++; 911 } else { 912 aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP); 913 aux->aux_guid = vd->vdev_guid; 914 aux->aux_count = 1; 915 avl_insert(avl, aux, where); 916 } 917 } 918 919 void 920 spa_aux_remove(vdev_t *vd, avl_tree_t *avl) 921 { 922 spa_aux_t search; 923 spa_aux_t *aux; 924 avl_index_t where; 925 926 search.aux_guid = vd->vdev_guid; 927 aux = avl_find(avl, &search, &where); 928 929 ASSERT(aux != NULL); 930 931 if (--aux->aux_count == 0) { 932 avl_remove(avl, aux); 933 kmem_free(aux, sizeof (spa_aux_t)); 934 } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) { 935 aux->aux_pool = 0ULL; 936 } 937 } 938 939 boolean_t 940 spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl) 941 { 942 spa_aux_t search, *found; 943 944 search.aux_guid = guid; 945 found = avl_find(avl, &search, NULL); 946 947 if (pool) { 948 if (found) 949 *pool = found->aux_pool; 950 else 951 *pool = 0ULL; 952 } 953 954 if (refcnt) { 955 if (found) 956 *refcnt = found->aux_count; 957 else 958 *refcnt = 0; 959 } 960 961 return (found != NULL); 962 } 963 964 void 965 spa_aux_activate(vdev_t *vd, avl_tree_t *avl) 966 { 967 spa_aux_t search, *found; 968 avl_index_t where; 969 970 search.aux_guid = vd->vdev_guid; 971 found = avl_find(avl, &search, &where); 972 ASSERT(found != NULL); 973 ASSERT(found->aux_pool == 0ULL); 974 975 found->aux_pool = spa_guid(vd->vdev_spa); 976 } 977 978 /* 979 * Spares are tracked globally due to the following constraints: 980 * 981 * - A spare may be part of multiple pools. 982 * - A spare may be added to a pool even if it's actively in use within 983 * another pool. 984 * - A spare in use in any pool can only be the source of a replacement if 985 * the target is a spare in the same pool. 986 * 987 * We keep track of all spares on the system through the use of a reference 988 * counted AVL tree. When a vdev is added as a spare, or used as a replacement 989 * spare, then we bump the reference count in the AVL tree. In addition, we set 990 * the 'vdev_isspare' member to indicate that the device is a spare (active or 991 * inactive). When a spare is made active (used to replace a device in the 992 * pool), we also keep track of which pool its been made a part of. 993 * 994 * The 'spa_spare_lock' protects the AVL tree. These functions are normally 995 * called under the spa_namespace lock as part of vdev reconfiguration. The 996 * separate spare lock exists for the status query path, which does not need to 997 * be completely consistent with respect to other vdev configuration changes. 998 */ 999 1000 static int 1001 spa_spare_compare(const void *a, const void *b) 1002 { 1003 return (spa_aux_compare(a, b)); 1004 } 1005 1006 void 1007 spa_spare_add(vdev_t *vd) 1008 { 1009 mutex_enter(&spa_spare_lock); 1010 ASSERT(!vd->vdev_isspare); 1011 spa_aux_add(vd, &spa_spare_avl); 1012 vd->vdev_isspare = B_TRUE; 1013 mutex_exit(&spa_spare_lock); 1014 } 1015 1016 void 1017 spa_spare_remove(vdev_t *vd) 1018 { 1019 mutex_enter(&spa_spare_lock); 1020 ASSERT(vd->vdev_isspare); 1021 spa_aux_remove(vd, &spa_spare_avl); 1022 vd->vdev_isspare = B_FALSE; 1023 mutex_exit(&spa_spare_lock); 1024 } 1025 1026 boolean_t 1027 spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt) 1028 { 1029 boolean_t found; 1030 1031 mutex_enter(&spa_spare_lock); 1032 found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl); 1033 mutex_exit(&spa_spare_lock); 1034 1035 return (found); 1036 } 1037 1038 void 1039 spa_spare_activate(vdev_t *vd) 1040 { 1041 mutex_enter(&spa_spare_lock); 1042 ASSERT(vd->vdev_isspare); 1043 spa_aux_activate(vd, &spa_spare_avl); 1044 mutex_exit(&spa_spare_lock); 1045 } 1046 1047 /* 1048 * Level 2 ARC devices are tracked globally for the same reasons as spares. 1049 * Cache devices currently only support one pool per cache device, and so 1050 * for these devices the aux reference count is currently unused beyond 1. 1051 */ 1052 1053 static int 1054 spa_l2cache_compare(const void *a, const void *b) 1055 { 1056 return (spa_aux_compare(a, b)); 1057 } 1058 1059 void 1060 spa_l2cache_add(vdev_t *vd) 1061 { 1062 mutex_enter(&spa_l2cache_lock); 1063 ASSERT(!vd->vdev_isl2cache); 1064 spa_aux_add(vd, &spa_l2cache_avl); 1065 vd->vdev_isl2cache = B_TRUE; 1066 mutex_exit(&spa_l2cache_lock); 1067 } 1068 1069 void 1070 spa_l2cache_remove(vdev_t *vd) 1071 { 1072 mutex_enter(&spa_l2cache_lock); 1073 ASSERT(vd->vdev_isl2cache); 1074 spa_aux_remove(vd, &spa_l2cache_avl); 1075 vd->vdev_isl2cache = B_FALSE; 1076 mutex_exit(&spa_l2cache_lock); 1077 } 1078 1079 boolean_t 1080 spa_l2cache_exists(uint64_t guid, uint64_t *pool) 1081 { 1082 boolean_t found; 1083 1084 mutex_enter(&spa_l2cache_lock); 1085 found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl); 1086 mutex_exit(&spa_l2cache_lock); 1087 1088 return (found); 1089 } 1090 1091 void 1092 spa_l2cache_activate(vdev_t *vd) 1093 { 1094 mutex_enter(&spa_l2cache_lock); 1095 ASSERT(vd->vdev_isl2cache); 1096 spa_aux_activate(vd, &spa_l2cache_avl); 1097 mutex_exit(&spa_l2cache_lock); 1098 } 1099 1100 /* 1101 * ========================================================================== 1102 * SPA vdev locking 1103 * ========================================================================== 1104 */ 1105 1106 /* 1107 * Lock the given spa_t for the purpose of adding or removing a vdev. 1108 * Grabs the global spa_namespace_lock plus the spa config lock for writing. 1109 * It returns the next transaction group for the spa_t. 1110 */ 1111 uint64_t 1112 spa_vdev_enter(spa_t *spa) 1113 { 1114 mutex_enter(&spa->spa_vdev_top_lock); 1115 mutex_enter(&spa_namespace_lock); 1116 return (spa_vdev_config_enter(spa)); 1117 } 1118 1119 /* 1120 * Internal implementation for spa_vdev_enter(). Used when a vdev 1121 * operation requires multiple syncs (i.e. removing a device) while 1122 * keeping the spa_namespace_lock held. 1123 */ 1124 uint64_t 1125 spa_vdev_config_enter(spa_t *spa) 1126 { 1127 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1128 1129 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); 1130 1131 return (spa_last_synced_txg(spa) + 1); 1132 } 1133 1134 /* 1135 * Used in combination with spa_vdev_config_enter() to allow the syncing 1136 * of multiple transactions without releasing the spa_namespace_lock. 1137 */ 1138 void 1139 spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag) 1140 { 1141 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1142 1143 int config_changed = B_FALSE; 1144 1145 ASSERT(txg > spa_last_synced_txg(spa)); 1146 1147 spa->spa_pending_vdev = NULL; 1148 1149 /* 1150 * Reassess the DTLs. 1151 */ 1152 vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE); 1153 1154 if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) { 1155 config_changed = B_TRUE; 1156 spa->spa_config_generation++; 1157 } 1158 1159 /* 1160 * Verify the metaslab classes. 1161 */ 1162 ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0); 1163 ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0); 1164 1165 spa_config_exit(spa, SCL_ALL, spa); 1166 1167 /* 1168 * Panic the system if the specified tag requires it. This 1169 * is useful for ensuring that configurations are updated 1170 * transactionally. 1171 */ 1172 if (zio_injection_enabled) 1173 zio_handle_panic_injection(spa, tag, 0); 1174 1175 /* 1176 * Note: this txg_wait_synced() is important because it ensures 1177 * that there won't be more than one config change per txg. 1178 * This allows us to use the txg as the generation number. 1179 */ 1180 if (error == 0) 1181 txg_wait_synced(spa->spa_dsl_pool, txg); 1182 1183 if (vd != NULL) { 1184 ASSERT(!vd->vdev_detached || vd->vdev_dtl_sm == NULL); 1185 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); 1186 vdev_free(vd); 1187 spa_config_exit(spa, SCL_ALL, spa); 1188 } 1189 1190 /* 1191 * If the config changed, update the config cache. 1192 */ 1193 if (config_changed) 1194 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1195 } 1196 1197 /* 1198 * Unlock the spa_t after adding or removing a vdev. Besides undoing the 1199 * locking of spa_vdev_enter(), we also want make sure the transactions have 1200 * synced to disk, and then update the global configuration cache with the new 1201 * information. 1202 */ 1203 int 1204 spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error) 1205 { 1206 spa_vdev_config_exit(spa, vd, txg, error, FTAG); 1207 mutex_exit(&spa_namespace_lock); 1208 mutex_exit(&spa->spa_vdev_top_lock); 1209 1210 return (error); 1211 } 1212 1213 /* 1214 * Lock the given spa_t for the purpose of changing vdev state. 1215 */ 1216 void 1217 spa_vdev_state_enter(spa_t *spa, int oplocks) 1218 { 1219 int locks = SCL_STATE_ALL | oplocks; 1220 1221 /* 1222 * Root pools may need to read of the underlying devfs filesystem 1223 * when opening up a vdev. Unfortunately if we're holding the 1224 * SCL_ZIO lock it will result in a deadlock when we try to issue 1225 * the read from the root filesystem. Instead we "prefetch" 1226 * the associated vnodes that we need prior to opening the 1227 * underlying devices and cache them so that we can prevent 1228 * any I/O when we are doing the actual open. 1229 */ 1230 if (spa_is_root(spa)) { 1231 int low = locks & ~(SCL_ZIO - 1); 1232 int high = locks & ~low; 1233 1234 spa_config_enter(spa, high, spa, RW_WRITER); 1235 vdev_hold(spa->spa_root_vdev); 1236 spa_config_enter(spa, low, spa, RW_WRITER); 1237 } else { 1238 spa_config_enter(spa, locks, spa, RW_WRITER); 1239 } 1240 spa->spa_vdev_locks = locks; 1241 } 1242 1243 int 1244 spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error) 1245 { 1246 boolean_t config_changed = B_FALSE; 1247 1248 if (vd != NULL || error == 0) 1249 vdev_dtl_reassess(vd ? vd->vdev_top : spa->spa_root_vdev, 1250 0, 0, B_FALSE); 1251 1252 if (vd != NULL) { 1253 vdev_state_dirty(vd->vdev_top); 1254 config_changed = B_TRUE; 1255 spa->spa_config_generation++; 1256 } 1257 1258 if (spa_is_root(spa)) 1259 vdev_rele(spa->spa_root_vdev); 1260 1261 ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL); 1262 spa_config_exit(spa, spa->spa_vdev_locks, spa); 1263 1264 /* 1265 * If anything changed, wait for it to sync. This ensures that, 1266 * from the system administrator's perspective, zpool(1M) commands 1267 * are synchronous. This is important for things like zpool offline: 1268 * when the command completes, you expect no further I/O from ZFS. 1269 */ 1270 if (vd != NULL) 1271 txg_wait_synced(spa->spa_dsl_pool, 0); 1272 1273 /* 1274 * If the config changed, update the config cache. 1275 */ 1276 if (config_changed) { 1277 mutex_enter(&spa_namespace_lock); 1278 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1279 mutex_exit(&spa_namespace_lock); 1280 } 1281 1282 return (error); 1283 } 1284 1285 /* 1286 * ========================================================================== 1287 * Miscellaneous functions 1288 * ========================================================================== 1289 */ 1290 1291 void 1292 spa_activate_mos_feature(spa_t *spa, const char *feature, dmu_tx_t *tx) 1293 { 1294 if (!nvlist_exists(spa->spa_label_features, feature)) { 1295 fnvlist_add_boolean(spa->spa_label_features, feature); 1296 /* 1297 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't 1298 * dirty the vdev config because lock SCL_CONFIG is not held. 1299 * Thankfully, in this case we don't need to dirty the config 1300 * because it will be written out anyway when we finish 1301 * creating the pool. 1302 */ 1303 if (tx->tx_txg != TXG_INITIAL) 1304 vdev_config_dirty(spa->spa_root_vdev); 1305 } 1306 } 1307 1308 void 1309 spa_deactivate_mos_feature(spa_t *spa, const char *feature) 1310 { 1311 if (nvlist_remove_all(spa->spa_label_features, feature) == 0) 1312 vdev_config_dirty(spa->spa_root_vdev); 1313 } 1314 1315 /* 1316 * Rename a spa_t. 1317 */ 1318 int 1319 spa_rename(const char *name, const char *newname) 1320 { 1321 spa_t *spa; 1322 int err; 1323 1324 /* 1325 * Lookup the spa_t and grab the config lock for writing. We need to 1326 * actually open the pool so that we can sync out the necessary labels. 1327 * It's OK to call spa_open() with the namespace lock held because we 1328 * allow recursive calls for other reasons. 1329 */ 1330 mutex_enter(&spa_namespace_lock); 1331 if ((err = spa_open(name, &spa, FTAG)) != 0) { 1332 mutex_exit(&spa_namespace_lock); 1333 return (err); 1334 } 1335 1336 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1337 1338 avl_remove(&spa_namespace_avl, spa); 1339 (void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name)); 1340 avl_add(&spa_namespace_avl, spa); 1341 1342 /* 1343 * Sync all labels to disk with the new names by marking the root vdev 1344 * dirty and waiting for it to sync. It will pick up the new pool name 1345 * during the sync. 1346 */ 1347 vdev_config_dirty(spa->spa_root_vdev); 1348 1349 spa_config_exit(spa, SCL_ALL, FTAG); 1350 1351 txg_wait_synced(spa->spa_dsl_pool, 0); 1352 1353 /* 1354 * Sync the updated config cache. 1355 */ 1356 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1357 1358 spa_close(spa, FTAG); 1359 1360 mutex_exit(&spa_namespace_lock); 1361 1362 return (0); 1363 } 1364 1365 /* 1366 * Return the spa_t associated with given pool_guid, if it exists. If 1367 * device_guid is non-zero, determine whether the pool exists *and* contains 1368 * a device with the specified device_guid. 1369 */ 1370 spa_t * 1371 spa_by_guid(uint64_t pool_guid, uint64_t device_guid) 1372 { 1373 spa_t *spa; 1374 avl_tree_t *t = &spa_namespace_avl; 1375 1376 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1377 1378 for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) { 1379 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1380 continue; 1381 if (spa->spa_root_vdev == NULL) 1382 continue; 1383 if (spa_guid(spa) == pool_guid) { 1384 if (device_guid == 0) 1385 break; 1386 1387 if (vdev_lookup_by_guid(spa->spa_root_vdev, 1388 device_guid) != NULL) 1389 break; 1390 1391 /* 1392 * Check any devices we may be in the process of adding. 1393 */ 1394 if (spa->spa_pending_vdev) { 1395 if (vdev_lookup_by_guid(spa->spa_pending_vdev, 1396 device_guid) != NULL) 1397 break; 1398 } 1399 } 1400 } 1401 1402 return (spa); 1403 } 1404 1405 /* 1406 * Determine whether a pool with the given pool_guid exists. 1407 */ 1408 boolean_t 1409 spa_guid_exists(uint64_t pool_guid, uint64_t device_guid) 1410 { 1411 return (spa_by_guid(pool_guid, device_guid) != NULL); 1412 } 1413 1414 char * 1415 spa_strdup(const char *s) 1416 { 1417 size_t len; 1418 char *new; 1419 1420 len = strlen(s); 1421 new = kmem_alloc(len + 1, KM_SLEEP); 1422 bcopy(s, new, len); 1423 new[len] = '\0'; 1424 1425 return (new); 1426 } 1427 1428 void 1429 spa_strfree(char *s) 1430 { 1431 kmem_free(s, strlen(s) + 1); 1432 } 1433 1434 uint64_t 1435 spa_get_random(uint64_t range) 1436 { 1437 uint64_t r; 1438 1439 ASSERT(range != 0); 1440 1441 (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t)); 1442 1443 return (r % range); 1444 } 1445 1446 uint64_t 1447 spa_generate_guid(spa_t *spa) 1448 { 1449 uint64_t guid = spa_get_random(-1ULL); 1450 1451 if (spa != NULL) { 1452 while (guid == 0 || spa_guid_exists(spa_guid(spa), guid)) 1453 guid = spa_get_random(-1ULL); 1454 } else { 1455 while (guid == 0 || spa_guid_exists(guid, 0)) 1456 guid = spa_get_random(-1ULL); 1457 } 1458 1459 return (guid); 1460 } 1461 1462 void 1463 snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp) 1464 { 1465 char type[256]; 1466 char *checksum = NULL; 1467 char *compress = NULL; 1468 1469 if (bp != NULL) { 1470 if (BP_GET_TYPE(bp) & DMU_OT_NEWTYPE) { 1471 dmu_object_byteswap_t bswap = 1472 DMU_OT_BYTESWAP(BP_GET_TYPE(bp)); 1473 (void) snprintf(type, sizeof (type), "bswap %s %s", 1474 DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) ? 1475 "metadata" : "data", 1476 dmu_ot_byteswap[bswap].ob_name); 1477 } else { 1478 (void) strlcpy(type, dmu_ot[BP_GET_TYPE(bp)].ot_name, 1479 sizeof (type)); 1480 } 1481 if (!BP_IS_EMBEDDED(bp)) { 1482 checksum = 1483 zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name; 1484 } 1485 compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name; 1486 } 1487 1488 SNPRINTF_BLKPTR(snprintf, ' ', buf, buflen, bp, type, checksum, 1489 compress); 1490 } 1491 1492 void 1493 spa_freeze(spa_t *spa) 1494 { 1495 uint64_t freeze_txg = 0; 1496 1497 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1498 if (spa->spa_freeze_txg == UINT64_MAX) { 1499 freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE; 1500 spa->spa_freeze_txg = freeze_txg; 1501 } 1502 spa_config_exit(spa, SCL_ALL, FTAG); 1503 if (freeze_txg != 0) 1504 txg_wait_synced(spa_get_dsl(spa), freeze_txg); 1505 } 1506 1507 void 1508 zfs_panic_recover(const char *fmt, ...) 1509 { 1510 va_list adx; 1511 1512 va_start(adx, fmt); 1513 vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx); 1514 va_end(adx); 1515 } 1516 1517 /* 1518 * This is a stripped-down version of strtoull, suitable only for converting 1519 * lowercase hexadecimal numbers that don't overflow. 1520 */ 1521 uint64_t 1522 zfs_strtonum(const char *str, char **nptr) 1523 { 1524 uint64_t val = 0; 1525 char c; 1526 int digit; 1527 1528 while ((c = *str) != '\0') { 1529 if (c >= '0' && c <= '9') 1530 digit = c - '0'; 1531 else if (c >= 'a' && c <= 'f') 1532 digit = 10 + c - 'a'; 1533 else 1534 break; 1535 1536 val *= 16; 1537 val += digit; 1538 1539 str++; 1540 } 1541 1542 if (nptr) 1543 *nptr = (char *)str; 1544 1545 return (val); 1546 } 1547 1548 /* 1549 * ========================================================================== 1550 * Accessor functions 1551 * ========================================================================== 1552 */ 1553 1554 boolean_t 1555 spa_shutting_down(spa_t *spa) 1556 { 1557 return (spa->spa_async_suspended); 1558 } 1559 1560 dsl_pool_t * 1561 spa_get_dsl(spa_t *spa) 1562 { 1563 return (spa->spa_dsl_pool); 1564 } 1565 1566 boolean_t 1567 spa_is_initializing(spa_t *spa) 1568 { 1569 return (spa->spa_is_initializing); 1570 } 1571 1572 boolean_t 1573 spa_indirect_vdevs_loaded(spa_t *spa) 1574 { 1575 return (spa->spa_indirect_vdevs_loaded); 1576 } 1577 1578 blkptr_t * 1579 spa_get_rootblkptr(spa_t *spa) 1580 { 1581 return (&spa->spa_ubsync.ub_rootbp); 1582 } 1583 1584 void 1585 spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp) 1586 { 1587 spa->spa_uberblock.ub_rootbp = *bp; 1588 } 1589 1590 void 1591 spa_altroot(spa_t *spa, char *buf, size_t buflen) 1592 { 1593 if (spa->spa_root == NULL) 1594 buf[0] = '\0'; 1595 else 1596 (void) strncpy(buf, spa->spa_root, buflen); 1597 } 1598 1599 int 1600 spa_sync_pass(spa_t *spa) 1601 { 1602 return (spa->spa_sync_pass); 1603 } 1604 1605 char * 1606 spa_name(spa_t *spa) 1607 { 1608 return (spa->spa_name); 1609 } 1610 1611 uint64_t 1612 spa_guid(spa_t *spa) 1613 { 1614 dsl_pool_t *dp = spa_get_dsl(spa); 1615 uint64_t guid; 1616 1617 /* 1618 * If we fail to parse the config during spa_load(), we can go through 1619 * the error path (which posts an ereport) and end up here with no root 1620 * vdev. We stash the original pool guid in 'spa_config_guid' to handle 1621 * this case. 1622 */ 1623 if (spa->spa_root_vdev == NULL) 1624 return (spa->spa_config_guid); 1625 1626 guid = spa->spa_last_synced_guid != 0 ? 1627 spa->spa_last_synced_guid : spa->spa_root_vdev->vdev_guid; 1628 1629 /* 1630 * Return the most recently synced out guid unless we're 1631 * in syncing context. 1632 */ 1633 if (dp && dsl_pool_sync_context(dp)) 1634 return (spa->spa_root_vdev->vdev_guid); 1635 else 1636 return (guid); 1637 } 1638 1639 uint64_t 1640 spa_load_guid(spa_t *spa) 1641 { 1642 /* 1643 * This is a GUID that exists solely as a reference for the 1644 * purposes of the arc. It is generated at load time, and 1645 * is never written to persistent storage. 1646 */ 1647 return (spa->spa_load_guid); 1648 } 1649 1650 uint64_t 1651 spa_last_synced_txg(spa_t *spa) 1652 { 1653 return (spa->spa_ubsync.ub_txg); 1654 } 1655 1656 uint64_t 1657 spa_first_txg(spa_t *spa) 1658 { 1659 return (spa->spa_first_txg); 1660 } 1661 1662 uint64_t 1663 spa_syncing_txg(spa_t *spa) 1664 { 1665 return (spa->spa_syncing_txg); 1666 } 1667 1668 /* 1669 * Return the last txg where data can be dirtied. The final txgs 1670 * will be used to just clear out any deferred frees that remain. 1671 */ 1672 uint64_t 1673 spa_final_dirty_txg(spa_t *spa) 1674 { 1675 return (spa->spa_final_txg - TXG_DEFER_SIZE); 1676 } 1677 1678 pool_state_t 1679 spa_state(spa_t *spa) 1680 { 1681 return (spa->spa_state); 1682 } 1683 1684 spa_load_state_t 1685 spa_load_state(spa_t *spa) 1686 { 1687 return (spa->spa_load_state); 1688 } 1689 1690 uint64_t 1691 spa_freeze_txg(spa_t *spa) 1692 { 1693 return (spa->spa_freeze_txg); 1694 } 1695 1696 /* ARGSUSED */ 1697 uint64_t 1698 spa_get_worst_case_asize(spa_t *spa, uint64_t lsize) 1699 { 1700 return (lsize * spa_asize_inflation); 1701 } 1702 1703 /* 1704 * Return the amount of slop space in bytes. It is 1/32 of the pool (3.2%), 1705 * or at least 128MB, unless that would cause it to be more than half the 1706 * pool size. 1707 * 1708 * See the comment above spa_slop_shift for details. 1709 */ 1710 uint64_t 1711 spa_get_slop_space(spa_t *spa) 1712 { 1713 uint64_t space = spa_get_dspace(spa); 1714 return (MAX(space >> spa_slop_shift, MIN(space >> 1, spa_min_slop))); 1715 } 1716 1717 uint64_t 1718 spa_get_dspace(spa_t *spa) 1719 { 1720 return (spa->spa_dspace); 1721 } 1722 1723 uint64_t 1724 spa_get_checkpoint_space(spa_t *spa) 1725 { 1726 return (spa->spa_checkpoint_info.sci_dspace); 1727 } 1728 1729 void 1730 spa_update_dspace(spa_t *spa) 1731 { 1732 spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) + 1733 ddt_get_dedup_dspace(spa); 1734 if (spa->spa_vdev_removal != NULL) { 1735 /* 1736 * We can't allocate from the removing device, so 1737 * subtract its size. This prevents the DMU/DSL from 1738 * filling up the (now smaller) pool while we are in the 1739 * middle of removing the device. 1740 * 1741 * Note that the DMU/DSL doesn't actually know or care 1742 * how much space is allocated (it does its own tracking 1743 * of how much space has been logically used). So it 1744 * doesn't matter that the data we are moving may be 1745 * allocated twice (on the old device and the new 1746 * device). 1747 */ 1748 vdev_t *vd = spa->spa_vdev_removal->svr_vdev; 1749 spa->spa_dspace -= spa_deflate(spa) ? 1750 vd->vdev_stat.vs_dspace : vd->vdev_stat.vs_space; 1751 } 1752 } 1753 1754 /* 1755 * Return the failure mode that has been set to this pool. The default 1756 * behavior will be to block all I/Os when a complete failure occurs. 1757 */ 1758 uint8_t 1759 spa_get_failmode(spa_t *spa) 1760 { 1761 return (spa->spa_failmode); 1762 } 1763 1764 boolean_t 1765 spa_suspended(spa_t *spa) 1766 { 1767 return (spa->spa_suspended); 1768 } 1769 1770 uint64_t 1771 spa_version(spa_t *spa) 1772 { 1773 return (spa->spa_ubsync.ub_version); 1774 } 1775 1776 boolean_t 1777 spa_deflate(spa_t *spa) 1778 { 1779 return (spa->spa_deflate); 1780 } 1781 1782 metaslab_class_t * 1783 spa_normal_class(spa_t *spa) 1784 { 1785 return (spa->spa_normal_class); 1786 } 1787 1788 metaslab_class_t * 1789 spa_log_class(spa_t *spa) 1790 { 1791 return (spa->spa_log_class); 1792 } 1793 1794 void 1795 spa_evicting_os_register(spa_t *spa, objset_t *os) 1796 { 1797 mutex_enter(&spa->spa_evicting_os_lock); 1798 list_insert_head(&spa->spa_evicting_os_list, os); 1799 mutex_exit(&spa->spa_evicting_os_lock); 1800 } 1801 1802 void 1803 spa_evicting_os_deregister(spa_t *spa, objset_t *os) 1804 { 1805 mutex_enter(&spa->spa_evicting_os_lock); 1806 list_remove(&spa->spa_evicting_os_list, os); 1807 cv_broadcast(&spa->spa_evicting_os_cv); 1808 mutex_exit(&spa->spa_evicting_os_lock); 1809 } 1810 1811 void 1812 spa_evicting_os_wait(spa_t *spa) 1813 { 1814 mutex_enter(&spa->spa_evicting_os_lock); 1815 while (!list_is_empty(&spa->spa_evicting_os_list)) 1816 cv_wait(&spa->spa_evicting_os_cv, &spa->spa_evicting_os_lock); 1817 mutex_exit(&spa->spa_evicting_os_lock); 1818 1819 dmu_buf_user_evict_wait(); 1820 } 1821 1822 int 1823 spa_max_replication(spa_t *spa) 1824 { 1825 /* 1826 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to 1827 * handle BPs with more than one DVA allocated. Set our max 1828 * replication level accordingly. 1829 */ 1830 if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS) 1831 return (1); 1832 return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override)); 1833 } 1834 1835 int 1836 spa_prev_software_version(spa_t *spa) 1837 { 1838 return (spa->spa_prev_software_version); 1839 } 1840 1841 uint64_t 1842 spa_deadman_synctime(spa_t *spa) 1843 { 1844 return (spa->spa_deadman_synctime); 1845 } 1846 1847 uint64_t 1848 dva_get_dsize_sync(spa_t *spa, const dva_t *dva) 1849 { 1850 uint64_t asize = DVA_GET_ASIZE(dva); 1851 uint64_t dsize = asize; 1852 1853 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1854 1855 if (asize != 0 && spa->spa_deflate) { 1856 vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva)); 1857 dsize = (asize >> SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio; 1858 } 1859 1860 return (dsize); 1861 } 1862 1863 uint64_t 1864 bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp) 1865 { 1866 uint64_t dsize = 0; 1867 1868 for (int d = 0; d < BP_GET_NDVAS(bp); d++) 1869 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]); 1870 1871 return (dsize); 1872 } 1873 1874 uint64_t 1875 bp_get_dsize(spa_t *spa, const blkptr_t *bp) 1876 { 1877 uint64_t dsize = 0; 1878 1879 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 1880 1881 for (int d = 0; d < BP_GET_NDVAS(bp); d++) 1882 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]); 1883 1884 spa_config_exit(spa, SCL_VDEV, FTAG); 1885 1886 return (dsize); 1887 } 1888 1889 /* 1890 * ========================================================================== 1891 * Initialization and Termination 1892 * ========================================================================== 1893 */ 1894 1895 static int 1896 spa_name_compare(const void *a1, const void *a2) 1897 { 1898 const spa_t *s1 = a1; 1899 const spa_t *s2 = a2; 1900 int s; 1901 1902 s = strcmp(s1->spa_name, s2->spa_name); 1903 if (s > 0) 1904 return (1); 1905 if (s < 0) 1906 return (-1); 1907 return (0); 1908 } 1909 1910 int 1911 spa_busy(void) 1912 { 1913 return (spa_active_count); 1914 } 1915 1916 void 1917 spa_boot_init() 1918 { 1919 spa_config_load(); 1920 } 1921 1922 void 1923 spa_init(int mode) 1924 { 1925 mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL); 1926 mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL); 1927 mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL); 1928 cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL); 1929 1930 avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t), 1931 offsetof(spa_t, spa_avl)); 1932 1933 avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t), 1934 offsetof(spa_aux_t, aux_avl)); 1935 1936 avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t), 1937 offsetof(spa_aux_t, aux_avl)); 1938 1939 spa_mode_global = mode; 1940 1941 #ifdef _KERNEL 1942 spa_arch_init(); 1943 #else 1944 if (spa_mode_global != FREAD && dprintf_find_string("watch")) { 1945 arc_procfd = open("/proc/self/ctl", O_WRONLY); 1946 if (arc_procfd == -1) { 1947 perror("could not enable watchpoints: " 1948 "opening /proc/self/ctl failed: "); 1949 } else { 1950 arc_watch = B_TRUE; 1951 } 1952 } 1953 #endif 1954 1955 refcount_init(); 1956 unique_init(); 1957 range_tree_init(); 1958 metaslab_alloc_trace_init(); 1959 zio_init(); 1960 dmu_init(); 1961 zil_init(); 1962 vdev_cache_stat_init(); 1963 zfs_prop_init(); 1964 zpool_prop_init(); 1965 zpool_feature_init(); 1966 spa_config_load(); 1967 l2arc_start(); 1968 } 1969 1970 void 1971 spa_fini(void) 1972 { 1973 l2arc_stop(); 1974 1975 spa_evict_all(); 1976 1977 vdev_cache_stat_fini(); 1978 zil_fini(); 1979 dmu_fini(); 1980 zio_fini(); 1981 metaslab_alloc_trace_fini(); 1982 range_tree_fini(); 1983 unique_fini(); 1984 refcount_fini(); 1985 1986 avl_destroy(&spa_namespace_avl); 1987 avl_destroy(&spa_spare_avl); 1988 avl_destroy(&spa_l2cache_avl); 1989 1990 cv_destroy(&spa_namespace_cv); 1991 mutex_destroy(&spa_namespace_lock); 1992 mutex_destroy(&spa_spare_lock); 1993 mutex_destroy(&spa_l2cache_lock); 1994 } 1995 1996 /* 1997 * Return whether this pool has slogs. No locking needed. 1998 * It's not a problem if the wrong answer is returned as it's only for 1999 * performance and not correctness 2000 */ 2001 boolean_t 2002 spa_has_slogs(spa_t *spa) 2003 { 2004 return (spa->spa_log_class->mc_rotor != NULL); 2005 } 2006 2007 spa_log_state_t 2008 spa_get_log_state(spa_t *spa) 2009 { 2010 return (spa->spa_log_state); 2011 } 2012 2013 void 2014 spa_set_log_state(spa_t *spa, spa_log_state_t state) 2015 { 2016 spa->spa_log_state = state; 2017 } 2018 2019 boolean_t 2020 spa_is_root(spa_t *spa) 2021 { 2022 return (spa->spa_is_root); 2023 } 2024 2025 boolean_t 2026 spa_writeable(spa_t *spa) 2027 { 2028 return (!!(spa->spa_mode & FWRITE) && spa->spa_trust_config); 2029 } 2030 2031 /* 2032 * Returns true if there is a pending sync task in any of the current 2033 * syncing txg, the current quiescing txg, or the current open txg. 2034 */ 2035 boolean_t 2036 spa_has_pending_synctask(spa_t *spa) 2037 { 2038 return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks) || 2039 !txg_all_lists_empty(&spa->spa_dsl_pool->dp_early_sync_tasks)); 2040 } 2041 2042 int 2043 spa_mode(spa_t *spa) 2044 { 2045 return (spa->spa_mode); 2046 } 2047 2048 uint64_t 2049 spa_bootfs(spa_t *spa) 2050 { 2051 return (spa->spa_bootfs); 2052 } 2053 2054 uint64_t 2055 spa_delegation(spa_t *spa) 2056 { 2057 return (spa->spa_delegation); 2058 } 2059 2060 objset_t * 2061 spa_meta_objset(spa_t *spa) 2062 { 2063 return (spa->spa_meta_objset); 2064 } 2065 2066 enum zio_checksum 2067 spa_dedup_checksum(spa_t *spa) 2068 { 2069 return (spa->spa_dedup_checksum); 2070 } 2071 2072 /* 2073 * Reset pool scan stat per scan pass (or reboot). 2074 */ 2075 void 2076 spa_scan_stat_init(spa_t *spa) 2077 { 2078 /* data not stored on disk */ 2079 spa->spa_scan_pass_start = gethrestime_sec(); 2080 if (dsl_scan_is_paused_scrub(spa->spa_dsl_pool->dp_scan)) 2081 spa->spa_scan_pass_scrub_pause = spa->spa_scan_pass_start; 2082 else 2083 spa->spa_scan_pass_scrub_pause = 0; 2084 spa->spa_scan_pass_scrub_spent_paused = 0; 2085 spa->spa_scan_pass_exam = 0; 2086 vdev_scan_stat_init(spa->spa_root_vdev); 2087 } 2088 2089 /* 2090 * Get scan stats for zpool status reports 2091 */ 2092 int 2093 spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps) 2094 { 2095 dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL; 2096 2097 if (scn == NULL || scn->scn_phys.scn_func == POOL_SCAN_NONE) 2098 return (SET_ERROR(ENOENT)); 2099 bzero(ps, sizeof (pool_scan_stat_t)); 2100 2101 /* data stored on disk */ 2102 ps->pss_func = scn->scn_phys.scn_func; 2103 ps->pss_start_time = scn->scn_phys.scn_start_time; 2104 ps->pss_end_time = scn->scn_phys.scn_end_time; 2105 ps->pss_to_examine = scn->scn_phys.scn_to_examine; 2106 ps->pss_examined = scn->scn_phys.scn_examined; 2107 ps->pss_to_process = scn->scn_phys.scn_to_process; 2108 ps->pss_processed = scn->scn_phys.scn_processed; 2109 ps->pss_errors = scn->scn_phys.scn_errors; 2110 ps->pss_state = scn->scn_phys.scn_state; 2111 2112 /* data not stored on disk */ 2113 ps->pss_pass_start = spa->spa_scan_pass_start; 2114 ps->pss_pass_exam = spa->spa_scan_pass_exam; 2115 ps->pss_pass_scrub_pause = spa->spa_scan_pass_scrub_pause; 2116 ps->pss_pass_scrub_spent_paused = spa->spa_scan_pass_scrub_spent_paused; 2117 2118 return (0); 2119 } 2120 2121 boolean_t 2122 spa_debug_enabled(spa_t *spa) 2123 { 2124 return (spa->spa_debug); 2125 } 2126 2127 int 2128 spa_maxblocksize(spa_t *spa) 2129 { 2130 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) 2131 return (SPA_MAXBLOCKSIZE); 2132 else 2133 return (SPA_OLD_MAXBLOCKSIZE); 2134 } 2135 2136 /* 2137 * Returns the txg that the last device removal completed. No indirect mappings 2138 * have been added since this txg. 2139 */ 2140 uint64_t 2141 spa_get_last_removal_txg(spa_t *spa) 2142 { 2143 uint64_t vdevid; 2144 uint64_t ret = -1ULL; 2145 2146 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 2147 /* 2148 * sr_prev_indirect_vdev is only modified while holding all the 2149 * config locks, so it is sufficient to hold SCL_VDEV as reader when 2150 * examining it. 2151 */ 2152 vdevid = spa->spa_removing_phys.sr_prev_indirect_vdev; 2153 2154 while (vdevid != -1ULL) { 2155 vdev_t *vd = vdev_lookup_top(spa, vdevid); 2156 vdev_indirect_births_t *vib = vd->vdev_indirect_births; 2157 2158 ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops); 2159 2160 /* 2161 * If the removal did not remap any data, we don't care. 2162 */ 2163 if (vdev_indirect_births_count(vib) != 0) { 2164 ret = vdev_indirect_births_last_entry_txg(vib); 2165 break; 2166 } 2167 2168 vdevid = vd->vdev_indirect_config.vic_prev_indirect_vdev; 2169 } 2170 spa_config_exit(spa, SCL_VDEV, FTAG); 2171 2172 IMPLY(ret != -1ULL, 2173 spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 2174 2175 return (ret); 2176 } 2177 2178 boolean_t 2179 spa_trust_config(spa_t *spa) 2180 { 2181 return (spa->spa_trust_config); 2182 } 2183 2184 uint64_t 2185 spa_missing_tvds_allowed(spa_t *spa) 2186 { 2187 return (spa->spa_missing_tvds_allowed); 2188 } 2189 2190 void 2191 spa_set_missing_tvds(spa_t *spa, uint64_t missing) 2192 { 2193 spa->spa_missing_tvds = missing; 2194 } 2195 2196 boolean_t 2197 spa_top_vdevs_spacemap_addressable(spa_t *spa) 2198 { 2199 vdev_t *rvd = spa->spa_root_vdev; 2200 for (uint64_t c = 0; c < rvd->vdev_children; c++) { 2201 if (!vdev_is_spacemap_addressable(rvd->vdev_child[c])) 2202 return (B_FALSE); 2203 } 2204 return (B_TRUE); 2205 } 2206 2207 boolean_t 2208 spa_has_checkpoint(spa_t *spa) 2209 { 2210 return (spa->spa_checkpoint_txg != 0); 2211 } 2212 2213 boolean_t 2214 spa_importing_readonly_checkpoint(spa_t *spa) 2215 { 2216 return ((spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT) && 2217 spa->spa_mode == FREAD); 2218 } 2219 2220 uint64_t 2221 spa_min_claim_txg(spa_t *spa) 2222 { 2223 uint64_t checkpoint_txg = spa->spa_uberblock.ub_checkpoint_txg; 2224 2225 if (checkpoint_txg != 0) 2226 return (checkpoint_txg + 1); 2227 2228 return (spa->spa_first_txg); 2229 } 2230 2231 /* 2232 * If there is a checkpoint, async destroys may consume more space from 2233 * the pool instead of freeing it. In an attempt to save the pool from 2234 * getting suspended when it is about to run out of space, we stop 2235 * processing async destroys. 2236 */ 2237 boolean_t 2238 spa_suspend_async_destroy(spa_t *spa) 2239 { 2240 dsl_pool_t *dp = spa_get_dsl(spa); 2241 2242 uint64_t unreserved = dsl_pool_unreserved_space(dp, 2243 ZFS_SPACE_CHECK_EXTRA_RESERVED); 2244 uint64_t used = dsl_dir_phys(dp->dp_root_dir)->dd_used_bytes; 2245 uint64_t avail = (unreserved > used) ? (unreserved - used) : 0; 2246 2247 if (spa_has_checkpoint(spa) && avail == 0) 2248 return (B_TRUE); 2249 2250 return (B_FALSE); 2251 } 2252