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, 2018 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_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 int spa_allocators = 4; 361 362 /*PRINTFLIKE2*/ 363 void 364 spa_load_failed(spa_t *spa, const char *fmt, ...) 365 { 366 va_list adx; 367 char buf[256]; 368 369 va_start(adx, fmt); 370 (void) vsnprintf(buf, sizeof (buf), fmt, adx); 371 va_end(adx); 372 373 zfs_dbgmsg("spa_load(%s, config %s): FAILED: %s", spa->spa_name, 374 spa->spa_trust_config ? "trusted" : "untrusted", buf); 375 } 376 377 /*PRINTFLIKE2*/ 378 void 379 spa_load_note(spa_t *spa, const char *fmt, ...) 380 { 381 va_list adx; 382 char buf[256]; 383 384 va_start(adx, fmt); 385 (void) vsnprintf(buf, sizeof (buf), fmt, adx); 386 va_end(adx); 387 388 zfs_dbgmsg("spa_load(%s, config %s): %s", spa->spa_name, 389 spa->spa_trust_config ? "trusted" : "untrusted", buf); 390 } 391 392 /* 393 * ========================================================================== 394 * SPA config locking 395 * ========================================================================== 396 */ 397 static void 398 spa_config_lock_init(spa_t *spa) 399 { 400 for (int i = 0; i < SCL_LOCKS; i++) { 401 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 402 mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL); 403 cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL); 404 refcount_create_untracked(&scl->scl_count); 405 scl->scl_writer = NULL; 406 scl->scl_write_wanted = 0; 407 } 408 } 409 410 static void 411 spa_config_lock_destroy(spa_t *spa) 412 { 413 for (int i = 0; i < SCL_LOCKS; i++) { 414 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 415 mutex_destroy(&scl->scl_lock); 416 cv_destroy(&scl->scl_cv); 417 refcount_destroy(&scl->scl_count); 418 ASSERT(scl->scl_writer == NULL); 419 ASSERT(scl->scl_write_wanted == 0); 420 } 421 } 422 423 int 424 spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw) 425 { 426 for (int i = 0; i < SCL_LOCKS; i++) { 427 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 428 if (!(locks & (1 << i))) 429 continue; 430 mutex_enter(&scl->scl_lock); 431 if (rw == RW_READER) { 432 if (scl->scl_writer || scl->scl_write_wanted) { 433 mutex_exit(&scl->scl_lock); 434 spa_config_exit(spa, locks & ((1 << i) - 1), 435 tag); 436 return (0); 437 } 438 } else { 439 ASSERT(scl->scl_writer != curthread); 440 if (!refcount_is_zero(&scl->scl_count)) { 441 mutex_exit(&scl->scl_lock); 442 spa_config_exit(spa, locks & ((1 << i) - 1), 443 tag); 444 return (0); 445 } 446 scl->scl_writer = curthread; 447 } 448 (void) refcount_add(&scl->scl_count, tag); 449 mutex_exit(&scl->scl_lock); 450 } 451 return (1); 452 } 453 454 void 455 spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw) 456 { 457 int wlocks_held = 0; 458 459 ASSERT3U(SCL_LOCKS, <, sizeof (wlocks_held) * NBBY); 460 461 for (int i = 0; i < SCL_LOCKS; i++) { 462 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 463 if (scl->scl_writer == curthread) 464 wlocks_held |= (1 << i); 465 if (!(locks & (1 << i))) 466 continue; 467 mutex_enter(&scl->scl_lock); 468 if (rw == RW_READER) { 469 while (scl->scl_writer || scl->scl_write_wanted) { 470 cv_wait(&scl->scl_cv, &scl->scl_lock); 471 } 472 } else { 473 ASSERT(scl->scl_writer != curthread); 474 while (!refcount_is_zero(&scl->scl_count)) { 475 scl->scl_write_wanted++; 476 cv_wait(&scl->scl_cv, &scl->scl_lock); 477 scl->scl_write_wanted--; 478 } 479 scl->scl_writer = curthread; 480 } 481 (void) refcount_add(&scl->scl_count, tag); 482 mutex_exit(&scl->scl_lock); 483 } 484 ASSERT3U(wlocks_held, <=, locks); 485 } 486 487 void 488 spa_config_exit(spa_t *spa, int locks, void *tag) 489 { 490 for (int i = SCL_LOCKS - 1; i >= 0; i--) { 491 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 492 if (!(locks & (1 << i))) 493 continue; 494 mutex_enter(&scl->scl_lock); 495 ASSERT(!refcount_is_zero(&scl->scl_count)); 496 if (refcount_remove(&scl->scl_count, tag) == 0) { 497 ASSERT(scl->scl_writer == NULL || 498 scl->scl_writer == curthread); 499 scl->scl_writer = NULL; /* OK in either case */ 500 cv_broadcast(&scl->scl_cv); 501 } 502 mutex_exit(&scl->scl_lock); 503 } 504 } 505 506 int 507 spa_config_held(spa_t *spa, int locks, krw_t rw) 508 { 509 int locks_held = 0; 510 511 for (int i = 0; i < SCL_LOCKS; i++) { 512 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 513 if (!(locks & (1 << i))) 514 continue; 515 if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) || 516 (rw == RW_WRITER && scl->scl_writer == curthread)) 517 locks_held |= 1 << i; 518 } 519 520 return (locks_held); 521 } 522 523 /* 524 * ========================================================================== 525 * SPA namespace functions 526 * ========================================================================== 527 */ 528 529 /* 530 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held. 531 * Returns NULL if no matching spa_t is found. 532 */ 533 spa_t * 534 spa_lookup(const char *name) 535 { 536 static spa_t search; /* spa_t is large; don't allocate on stack */ 537 spa_t *spa; 538 avl_index_t where; 539 char *cp; 540 541 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 542 543 (void) strlcpy(search.spa_name, name, sizeof (search.spa_name)); 544 545 /* 546 * If it's a full dataset name, figure out the pool name and 547 * just use that. 548 */ 549 cp = strpbrk(search.spa_name, "/@#"); 550 if (cp != NULL) 551 *cp = '\0'; 552 553 spa = avl_find(&spa_namespace_avl, &search, &where); 554 555 return (spa); 556 } 557 558 /* 559 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms. 560 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues 561 * looking for potentially hung I/Os. 562 */ 563 void 564 spa_deadman(void *arg) 565 { 566 spa_t *spa = arg; 567 568 /* 569 * Disable the deadman timer if the pool is suspended. 570 */ 571 if (spa_suspended(spa)) { 572 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 573 return; 574 } 575 576 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu", 577 (gethrtime() - spa->spa_sync_starttime) / NANOSEC, 578 ++spa->spa_deadman_calls); 579 if (zfs_deadman_enabled) 580 vdev_deadman(spa->spa_root_vdev); 581 } 582 583 /* 584 * Create an uninitialized spa_t with the given name. Requires 585 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already 586 * exist by calling spa_lookup() first. 587 */ 588 spa_t * 589 spa_add(const char *name, nvlist_t *config, const char *altroot) 590 { 591 spa_t *spa; 592 spa_config_dirent_t *dp; 593 cyc_handler_t hdlr; 594 cyc_time_t when; 595 596 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 597 598 spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP); 599 600 mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL); 601 mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL); 602 mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL); 603 mutex_init(&spa->spa_evicting_os_lock, NULL, MUTEX_DEFAULT, NULL); 604 mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL); 605 mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL); 606 mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL); 607 mutex_init(&spa->spa_cksum_tmpls_lock, NULL, MUTEX_DEFAULT, NULL); 608 mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL); 609 mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL); 610 mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL); 611 mutex_init(&spa->spa_iokstat_lock, NULL, MUTEX_DEFAULT, NULL); 612 613 cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL); 614 cv_init(&spa->spa_evicting_os_cv, NULL, CV_DEFAULT, NULL); 615 cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL); 616 cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL); 617 cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL); 618 619 for (int t = 0; t < TXG_SIZE; t++) 620 bplist_create(&spa->spa_free_bplist[t]); 621 622 (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name)); 623 spa->spa_state = POOL_STATE_UNINITIALIZED; 624 spa->spa_freeze_txg = UINT64_MAX; 625 spa->spa_final_txg = UINT64_MAX; 626 spa->spa_load_max_txg = UINT64_MAX; 627 spa->spa_proc = &p0; 628 spa->spa_proc_state = SPA_PROC_NONE; 629 spa->spa_trust_config = B_TRUE; 630 631 hdlr.cyh_func = spa_deadman; 632 hdlr.cyh_arg = spa; 633 hdlr.cyh_level = CY_LOW_LEVEL; 634 635 spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime_ms); 636 637 /* 638 * This determines how often we need to check for hung I/Os after 639 * the cyclic has already fired. Since checking for hung I/Os is 640 * an expensive operation we don't want to check too frequently. 641 * Instead wait for 5 seconds before checking again. 642 */ 643 when.cyt_interval = MSEC2NSEC(zfs_deadman_checktime_ms); 644 when.cyt_when = CY_INFINITY; 645 mutex_enter(&cpu_lock); 646 spa->spa_deadman_cycid = cyclic_add(&hdlr, &when); 647 mutex_exit(&cpu_lock); 648 649 refcount_create(&spa->spa_refcount); 650 spa_config_lock_init(spa); 651 652 avl_add(&spa_namespace_avl, spa); 653 654 /* 655 * Set the alternate root, if there is one. 656 */ 657 if (altroot) { 658 spa->spa_root = spa_strdup(altroot); 659 spa_active_count++; 660 } 661 662 spa->spa_alloc_count = spa_allocators; 663 spa->spa_alloc_locks = kmem_zalloc(spa->spa_alloc_count * 664 sizeof (kmutex_t), KM_SLEEP); 665 spa->spa_alloc_trees = kmem_zalloc(spa->spa_alloc_count * 666 sizeof (avl_tree_t), KM_SLEEP); 667 for (int i = 0; i < spa->spa_alloc_count; i++) { 668 mutex_init(&spa->spa_alloc_locks[i], NULL, MUTEX_DEFAULT, NULL); 669 avl_create(&spa->spa_alloc_trees[i], zio_bookmark_compare, 670 sizeof (zio_t), offsetof(zio_t, io_alloc_node)); 671 } 672 673 /* 674 * Every pool starts with the default cachefile 675 */ 676 list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t), 677 offsetof(spa_config_dirent_t, scd_link)); 678 679 dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP); 680 dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path); 681 list_insert_head(&spa->spa_config_list, dp); 682 683 VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME, 684 KM_SLEEP) == 0); 685 686 if (config != NULL) { 687 nvlist_t *features; 688 689 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ, 690 &features) == 0) { 691 VERIFY(nvlist_dup(features, &spa->spa_label_features, 692 0) == 0); 693 } 694 695 VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0); 696 } 697 698 if (spa->spa_label_features == NULL) { 699 VERIFY(nvlist_alloc(&spa->spa_label_features, NV_UNIQUE_NAME, 700 KM_SLEEP) == 0); 701 } 702 703 spa->spa_iokstat = kstat_create("zfs", 0, name, 704 "disk", KSTAT_TYPE_IO, 1, 0); 705 if (spa->spa_iokstat) { 706 spa->spa_iokstat->ks_lock = &spa->spa_iokstat_lock; 707 kstat_install(spa->spa_iokstat); 708 } 709 710 spa->spa_min_ashift = INT_MAX; 711 spa->spa_max_ashift = 0; 712 713 /* 714 * As a pool is being created, treat all features as disabled by 715 * setting SPA_FEATURE_DISABLED for all entries in the feature 716 * refcount cache. 717 */ 718 for (int i = 0; i < SPA_FEATURES; i++) { 719 spa->spa_feat_refcount_cache[i] = SPA_FEATURE_DISABLED; 720 } 721 722 return (spa); 723 } 724 725 /* 726 * Removes a spa_t from the namespace, freeing up any memory used. Requires 727 * spa_namespace_lock. This is called only after the spa_t has been closed and 728 * deactivated. 729 */ 730 void 731 spa_remove(spa_t *spa) 732 { 733 spa_config_dirent_t *dp; 734 735 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 736 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 737 ASSERT3U(refcount_count(&spa->spa_refcount), ==, 0); 738 739 nvlist_free(spa->spa_config_splitting); 740 741 avl_remove(&spa_namespace_avl, spa); 742 cv_broadcast(&spa_namespace_cv); 743 744 if (spa->spa_root) { 745 spa_strfree(spa->spa_root); 746 spa_active_count--; 747 } 748 749 while ((dp = list_head(&spa->spa_config_list)) != NULL) { 750 list_remove(&spa->spa_config_list, dp); 751 if (dp->scd_path != NULL) 752 spa_strfree(dp->scd_path); 753 kmem_free(dp, sizeof (spa_config_dirent_t)); 754 } 755 756 for (int i = 0; i < spa->spa_alloc_count; i++) { 757 avl_destroy(&spa->spa_alloc_trees[i]); 758 mutex_destroy(&spa->spa_alloc_locks[i]); 759 } 760 kmem_free(spa->spa_alloc_locks, spa->spa_alloc_count * 761 sizeof (kmutex_t)); 762 kmem_free(spa->spa_alloc_trees, spa->spa_alloc_count * 763 sizeof (avl_tree_t)); 764 765 list_destroy(&spa->spa_config_list); 766 767 nvlist_free(spa->spa_label_features); 768 nvlist_free(spa->spa_load_info); 769 spa_config_set(spa, NULL); 770 771 mutex_enter(&cpu_lock); 772 if (spa->spa_deadman_cycid != CYCLIC_NONE) 773 cyclic_remove(spa->spa_deadman_cycid); 774 mutex_exit(&cpu_lock); 775 spa->spa_deadman_cycid = CYCLIC_NONE; 776 777 refcount_destroy(&spa->spa_refcount); 778 779 spa_config_lock_destroy(spa); 780 781 kstat_delete(spa->spa_iokstat); 782 spa->spa_iokstat = NULL; 783 784 for (int t = 0; t < TXG_SIZE; t++) 785 bplist_destroy(&spa->spa_free_bplist[t]); 786 787 zio_checksum_templates_free(spa); 788 789 cv_destroy(&spa->spa_async_cv); 790 cv_destroy(&spa->spa_evicting_os_cv); 791 cv_destroy(&spa->spa_proc_cv); 792 cv_destroy(&spa->spa_scrub_io_cv); 793 cv_destroy(&spa->spa_suspend_cv); 794 795 mutex_destroy(&spa->spa_async_lock); 796 mutex_destroy(&spa->spa_errlist_lock); 797 mutex_destroy(&spa->spa_errlog_lock); 798 mutex_destroy(&spa->spa_evicting_os_lock); 799 mutex_destroy(&spa->spa_history_lock); 800 mutex_destroy(&spa->spa_proc_lock); 801 mutex_destroy(&spa->spa_props_lock); 802 mutex_destroy(&spa->spa_cksum_tmpls_lock); 803 mutex_destroy(&spa->spa_scrub_lock); 804 mutex_destroy(&spa->spa_suspend_lock); 805 mutex_destroy(&spa->spa_vdev_top_lock); 806 mutex_destroy(&spa->spa_iokstat_lock); 807 808 kmem_free(spa, sizeof (spa_t)); 809 } 810 811 /* 812 * Given a pool, return the next pool in the namespace, or NULL if there is 813 * none. If 'prev' is NULL, return the first pool. 814 */ 815 spa_t * 816 spa_next(spa_t *prev) 817 { 818 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 819 820 if (prev) 821 return (AVL_NEXT(&spa_namespace_avl, prev)); 822 else 823 return (avl_first(&spa_namespace_avl)); 824 } 825 826 /* 827 * ========================================================================== 828 * SPA refcount functions 829 * ========================================================================== 830 */ 831 832 /* 833 * Add a reference to the given spa_t. Must have at least one reference, or 834 * have the namespace lock held. 835 */ 836 void 837 spa_open_ref(spa_t *spa, void *tag) 838 { 839 ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref || 840 MUTEX_HELD(&spa_namespace_lock)); 841 (void) refcount_add(&spa->spa_refcount, tag); 842 } 843 844 /* 845 * Remove a reference to the given spa_t. Must have at least one reference, or 846 * have the namespace lock held. 847 */ 848 void 849 spa_close(spa_t *spa, void *tag) 850 { 851 ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref || 852 MUTEX_HELD(&spa_namespace_lock)); 853 (void) refcount_remove(&spa->spa_refcount, tag); 854 } 855 856 /* 857 * Remove a reference to the given spa_t held by a dsl dir that is 858 * being asynchronously released. Async releases occur from a taskq 859 * performing eviction of dsl datasets and dirs. The namespace lock 860 * isn't held and the hold by the object being evicted may contribute to 861 * spa_minref (e.g. dataset or directory released during pool export), 862 * so the asserts in spa_close() do not apply. 863 */ 864 void 865 spa_async_close(spa_t *spa, void *tag) 866 { 867 (void) refcount_remove(&spa->spa_refcount, tag); 868 } 869 870 /* 871 * Check to see if the spa refcount is zero. Must be called with 872 * spa_namespace_lock held. We really compare against spa_minref, which is the 873 * number of references acquired when opening a pool 874 */ 875 boolean_t 876 spa_refcount_zero(spa_t *spa) 877 { 878 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 879 880 return (refcount_count(&spa->spa_refcount) == spa->spa_minref); 881 } 882 883 /* 884 * ========================================================================== 885 * SPA spare and l2cache tracking 886 * ========================================================================== 887 */ 888 889 /* 890 * Hot spares and cache devices are tracked using the same code below, 891 * for 'auxiliary' devices. 892 */ 893 894 typedef struct spa_aux { 895 uint64_t aux_guid; 896 uint64_t aux_pool; 897 avl_node_t aux_avl; 898 int aux_count; 899 } spa_aux_t; 900 901 static int 902 spa_aux_compare(const void *a, const void *b) 903 { 904 const spa_aux_t *sa = a; 905 const spa_aux_t *sb = b; 906 907 if (sa->aux_guid < sb->aux_guid) 908 return (-1); 909 else if (sa->aux_guid > sb->aux_guid) 910 return (1); 911 else 912 return (0); 913 } 914 915 void 916 spa_aux_add(vdev_t *vd, avl_tree_t *avl) 917 { 918 avl_index_t where; 919 spa_aux_t search; 920 spa_aux_t *aux; 921 922 search.aux_guid = vd->vdev_guid; 923 if ((aux = avl_find(avl, &search, &where)) != NULL) { 924 aux->aux_count++; 925 } else { 926 aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP); 927 aux->aux_guid = vd->vdev_guid; 928 aux->aux_count = 1; 929 avl_insert(avl, aux, where); 930 } 931 } 932 933 void 934 spa_aux_remove(vdev_t *vd, avl_tree_t *avl) 935 { 936 spa_aux_t search; 937 spa_aux_t *aux; 938 avl_index_t where; 939 940 search.aux_guid = vd->vdev_guid; 941 aux = avl_find(avl, &search, &where); 942 943 ASSERT(aux != NULL); 944 945 if (--aux->aux_count == 0) { 946 avl_remove(avl, aux); 947 kmem_free(aux, sizeof (spa_aux_t)); 948 } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) { 949 aux->aux_pool = 0ULL; 950 } 951 } 952 953 boolean_t 954 spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl) 955 { 956 spa_aux_t search, *found; 957 958 search.aux_guid = guid; 959 found = avl_find(avl, &search, NULL); 960 961 if (pool) { 962 if (found) 963 *pool = found->aux_pool; 964 else 965 *pool = 0ULL; 966 } 967 968 if (refcnt) { 969 if (found) 970 *refcnt = found->aux_count; 971 else 972 *refcnt = 0; 973 } 974 975 return (found != NULL); 976 } 977 978 void 979 spa_aux_activate(vdev_t *vd, avl_tree_t *avl) 980 { 981 spa_aux_t search, *found; 982 avl_index_t where; 983 984 search.aux_guid = vd->vdev_guid; 985 found = avl_find(avl, &search, &where); 986 ASSERT(found != NULL); 987 ASSERT(found->aux_pool == 0ULL); 988 989 found->aux_pool = spa_guid(vd->vdev_spa); 990 } 991 992 /* 993 * Spares are tracked globally due to the following constraints: 994 * 995 * - A spare may be part of multiple pools. 996 * - A spare may be added to a pool even if it's actively in use within 997 * another pool. 998 * - A spare in use in any pool can only be the source of a replacement if 999 * the target is a spare in the same pool. 1000 * 1001 * We keep track of all spares on the system through the use of a reference 1002 * counted AVL tree. When a vdev is added as a spare, or used as a replacement 1003 * spare, then we bump the reference count in the AVL tree. In addition, we set 1004 * the 'vdev_isspare' member to indicate that the device is a spare (active or 1005 * inactive). When a spare is made active (used to replace a device in the 1006 * pool), we also keep track of which pool its been made a part of. 1007 * 1008 * The 'spa_spare_lock' protects the AVL tree. These functions are normally 1009 * called under the spa_namespace lock as part of vdev reconfiguration. The 1010 * separate spare lock exists for the status query path, which does not need to 1011 * be completely consistent with respect to other vdev configuration changes. 1012 */ 1013 1014 static int 1015 spa_spare_compare(const void *a, const void *b) 1016 { 1017 return (spa_aux_compare(a, b)); 1018 } 1019 1020 void 1021 spa_spare_add(vdev_t *vd) 1022 { 1023 mutex_enter(&spa_spare_lock); 1024 ASSERT(!vd->vdev_isspare); 1025 spa_aux_add(vd, &spa_spare_avl); 1026 vd->vdev_isspare = B_TRUE; 1027 mutex_exit(&spa_spare_lock); 1028 } 1029 1030 void 1031 spa_spare_remove(vdev_t *vd) 1032 { 1033 mutex_enter(&spa_spare_lock); 1034 ASSERT(vd->vdev_isspare); 1035 spa_aux_remove(vd, &spa_spare_avl); 1036 vd->vdev_isspare = B_FALSE; 1037 mutex_exit(&spa_spare_lock); 1038 } 1039 1040 boolean_t 1041 spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt) 1042 { 1043 boolean_t found; 1044 1045 mutex_enter(&spa_spare_lock); 1046 found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl); 1047 mutex_exit(&spa_spare_lock); 1048 1049 return (found); 1050 } 1051 1052 void 1053 spa_spare_activate(vdev_t *vd) 1054 { 1055 mutex_enter(&spa_spare_lock); 1056 ASSERT(vd->vdev_isspare); 1057 spa_aux_activate(vd, &spa_spare_avl); 1058 mutex_exit(&spa_spare_lock); 1059 } 1060 1061 /* 1062 * Level 2 ARC devices are tracked globally for the same reasons as spares. 1063 * Cache devices currently only support one pool per cache device, and so 1064 * for these devices the aux reference count is currently unused beyond 1. 1065 */ 1066 1067 static int 1068 spa_l2cache_compare(const void *a, const void *b) 1069 { 1070 return (spa_aux_compare(a, b)); 1071 } 1072 1073 void 1074 spa_l2cache_add(vdev_t *vd) 1075 { 1076 mutex_enter(&spa_l2cache_lock); 1077 ASSERT(!vd->vdev_isl2cache); 1078 spa_aux_add(vd, &spa_l2cache_avl); 1079 vd->vdev_isl2cache = B_TRUE; 1080 mutex_exit(&spa_l2cache_lock); 1081 } 1082 1083 void 1084 spa_l2cache_remove(vdev_t *vd) 1085 { 1086 mutex_enter(&spa_l2cache_lock); 1087 ASSERT(vd->vdev_isl2cache); 1088 spa_aux_remove(vd, &spa_l2cache_avl); 1089 vd->vdev_isl2cache = B_FALSE; 1090 mutex_exit(&spa_l2cache_lock); 1091 } 1092 1093 boolean_t 1094 spa_l2cache_exists(uint64_t guid, uint64_t *pool) 1095 { 1096 boolean_t found; 1097 1098 mutex_enter(&spa_l2cache_lock); 1099 found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl); 1100 mutex_exit(&spa_l2cache_lock); 1101 1102 return (found); 1103 } 1104 1105 void 1106 spa_l2cache_activate(vdev_t *vd) 1107 { 1108 mutex_enter(&spa_l2cache_lock); 1109 ASSERT(vd->vdev_isl2cache); 1110 spa_aux_activate(vd, &spa_l2cache_avl); 1111 mutex_exit(&spa_l2cache_lock); 1112 } 1113 1114 /* 1115 * ========================================================================== 1116 * SPA vdev locking 1117 * ========================================================================== 1118 */ 1119 1120 /* 1121 * Lock the given spa_t for the purpose of adding or removing a vdev. 1122 * Grabs the global spa_namespace_lock plus the spa config lock for writing. 1123 * It returns the next transaction group for the spa_t. 1124 */ 1125 uint64_t 1126 spa_vdev_enter(spa_t *spa) 1127 { 1128 mutex_enter(&spa->spa_vdev_top_lock); 1129 mutex_enter(&spa_namespace_lock); 1130 return (spa_vdev_config_enter(spa)); 1131 } 1132 1133 /* 1134 * Internal implementation for spa_vdev_enter(). Used when a vdev 1135 * operation requires multiple syncs (i.e. removing a device) while 1136 * keeping the spa_namespace_lock held. 1137 */ 1138 uint64_t 1139 spa_vdev_config_enter(spa_t *spa) 1140 { 1141 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1142 1143 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); 1144 1145 return (spa_last_synced_txg(spa) + 1); 1146 } 1147 1148 /* 1149 * Used in combination with spa_vdev_config_enter() to allow the syncing 1150 * of multiple transactions without releasing the spa_namespace_lock. 1151 */ 1152 void 1153 spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag) 1154 { 1155 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1156 1157 int config_changed = B_FALSE; 1158 1159 ASSERT(txg > spa_last_synced_txg(spa)); 1160 1161 spa->spa_pending_vdev = NULL; 1162 1163 /* 1164 * Reassess the DTLs. 1165 */ 1166 vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE); 1167 1168 if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) { 1169 config_changed = B_TRUE; 1170 spa->spa_config_generation++; 1171 } 1172 1173 /* 1174 * Verify the metaslab classes. 1175 */ 1176 ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0); 1177 ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0); 1178 1179 spa_config_exit(spa, SCL_ALL, spa); 1180 1181 /* 1182 * Panic the system if the specified tag requires it. This 1183 * is useful for ensuring that configurations are updated 1184 * transactionally. 1185 */ 1186 if (zio_injection_enabled) 1187 zio_handle_panic_injection(spa, tag, 0); 1188 1189 /* 1190 * Note: this txg_wait_synced() is important because it ensures 1191 * that there won't be more than one config change per txg. 1192 * This allows us to use the txg as the generation number. 1193 */ 1194 if (error == 0) 1195 txg_wait_synced(spa->spa_dsl_pool, txg); 1196 1197 if (vd != NULL) { 1198 ASSERT(!vd->vdev_detached || vd->vdev_dtl_sm == NULL); 1199 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); 1200 vdev_free(vd); 1201 spa_config_exit(spa, SCL_ALL, spa); 1202 } 1203 1204 /* 1205 * If the config changed, update the config cache. 1206 */ 1207 if (config_changed) 1208 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1209 } 1210 1211 /* 1212 * Unlock the spa_t after adding or removing a vdev. Besides undoing the 1213 * locking of spa_vdev_enter(), we also want make sure the transactions have 1214 * synced to disk, and then update the global configuration cache with the new 1215 * information. 1216 */ 1217 int 1218 spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error) 1219 { 1220 spa_vdev_config_exit(spa, vd, txg, error, FTAG); 1221 mutex_exit(&spa_namespace_lock); 1222 mutex_exit(&spa->spa_vdev_top_lock); 1223 1224 return (error); 1225 } 1226 1227 /* 1228 * Lock the given spa_t for the purpose of changing vdev state. 1229 */ 1230 void 1231 spa_vdev_state_enter(spa_t *spa, int oplocks) 1232 { 1233 int locks = SCL_STATE_ALL | oplocks; 1234 1235 /* 1236 * Root pools may need to read of the underlying devfs filesystem 1237 * when opening up a vdev. Unfortunately if we're holding the 1238 * SCL_ZIO lock it will result in a deadlock when we try to issue 1239 * the read from the root filesystem. Instead we "prefetch" 1240 * the associated vnodes that we need prior to opening the 1241 * underlying devices and cache them so that we can prevent 1242 * any I/O when we are doing the actual open. 1243 */ 1244 if (spa_is_root(spa)) { 1245 int low = locks & ~(SCL_ZIO - 1); 1246 int high = locks & ~low; 1247 1248 spa_config_enter(spa, high, spa, RW_WRITER); 1249 vdev_hold(spa->spa_root_vdev); 1250 spa_config_enter(spa, low, spa, RW_WRITER); 1251 } else { 1252 spa_config_enter(spa, locks, spa, RW_WRITER); 1253 } 1254 spa->spa_vdev_locks = locks; 1255 } 1256 1257 int 1258 spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error) 1259 { 1260 boolean_t config_changed = B_FALSE; 1261 1262 if (vd != NULL || error == 0) 1263 vdev_dtl_reassess(vd ? vd->vdev_top : spa->spa_root_vdev, 1264 0, 0, B_FALSE); 1265 1266 if (vd != NULL) { 1267 vdev_state_dirty(vd->vdev_top); 1268 config_changed = B_TRUE; 1269 spa->spa_config_generation++; 1270 } 1271 1272 if (spa_is_root(spa)) 1273 vdev_rele(spa->spa_root_vdev); 1274 1275 ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL); 1276 spa_config_exit(spa, spa->spa_vdev_locks, spa); 1277 1278 /* 1279 * If anything changed, wait for it to sync. This ensures that, 1280 * from the system administrator's perspective, zpool(1M) commands 1281 * are synchronous. This is important for things like zpool offline: 1282 * when the command completes, you expect no further I/O from ZFS. 1283 */ 1284 if (vd != NULL) 1285 txg_wait_synced(spa->spa_dsl_pool, 0); 1286 1287 /* 1288 * If the config changed, update the config cache. 1289 */ 1290 if (config_changed) { 1291 mutex_enter(&spa_namespace_lock); 1292 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1293 mutex_exit(&spa_namespace_lock); 1294 } 1295 1296 return (error); 1297 } 1298 1299 /* 1300 * ========================================================================== 1301 * Miscellaneous functions 1302 * ========================================================================== 1303 */ 1304 1305 void 1306 spa_activate_mos_feature(spa_t *spa, const char *feature, dmu_tx_t *tx) 1307 { 1308 if (!nvlist_exists(spa->spa_label_features, feature)) { 1309 fnvlist_add_boolean(spa->spa_label_features, feature); 1310 /* 1311 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't 1312 * dirty the vdev config because lock SCL_CONFIG is not held. 1313 * Thankfully, in this case we don't need to dirty the config 1314 * because it will be written out anyway when we finish 1315 * creating the pool. 1316 */ 1317 if (tx->tx_txg != TXG_INITIAL) 1318 vdev_config_dirty(spa->spa_root_vdev); 1319 } 1320 } 1321 1322 void 1323 spa_deactivate_mos_feature(spa_t *spa, const char *feature) 1324 { 1325 if (nvlist_remove_all(spa->spa_label_features, feature) == 0) 1326 vdev_config_dirty(spa->spa_root_vdev); 1327 } 1328 1329 /* 1330 * Rename a spa_t. 1331 */ 1332 int 1333 spa_rename(const char *name, const char *newname) 1334 { 1335 spa_t *spa; 1336 int err; 1337 1338 /* 1339 * Lookup the spa_t and grab the config lock for writing. We need to 1340 * actually open the pool so that we can sync out the necessary labels. 1341 * It's OK to call spa_open() with the namespace lock held because we 1342 * allow recursive calls for other reasons. 1343 */ 1344 mutex_enter(&spa_namespace_lock); 1345 if ((err = spa_open(name, &spa, FTAG)) != 0) { 1346 mutex_exit(&spa_namespace_lock); 1347 return (err); 1348 } 1349 1350 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1351 1352 avl_remove(&spa_namespace_avl, spa); 1353 (void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name)); 1354 avl_add(&spa_namespace_avl, spa); 1355 1356 /* 1357 * Sync all labels to disk with the new names by marking the root vdev 1358 * dirty and waiting for it to sync. It will pick up the new pool name 1359 * during the sync. 1360 */ 1361 vdev_config_dirty(spa->spa_root_vdev); 1362 1363 spa_config_exit(spa, SCL_ALL, FTAG); 1364 1365 txg_wait_synced(spa->spa_dsl_pool, 0); 1366 1367 /* 1368 * Sync the updated config cache. 1369 */ 1370 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1371 1372 spa_close(spa, FTAG); 1373 1374 mutex_exit(&spa_namespace_lock); 1375 1376 return (0); 1377 } 1378 1379 /* 1380 * Return the spa_t associated with given pool_guid, if it exists. If 1381 * device_guid is non-zero, determine whether the pool exists *and* contains 1382 * a device with the specified device_guid. 1383 */ 1384 spa_t * 1385 spa_by_guid(uint64_t pool_guid, uint64_t device_guid) 1386 { 1387 spa_t *spa; 1388 avl_tree_t *t = &spa_namespace_avl; 1389 1390 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1391 1392 for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) { 1393 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1394 continue; 1395 if (spa->spa_root_vdev == NULL) 1396 continue; 1397 if (spa_guid(spa) == pool_guid) { 1398 if (device_guid == 0) 1399 break; 1400 1401 if (vdev_lookup_by_guid(spa->spa_root_vdev, 1402 device_guid) != NULL) 1403 break; 1404 1405 /* 1406 * Check any devices we may be in the process of adding. 1407 */ 1408 if (spa->spa_pending_vdev) { 1409 if (vdev_lookup_by_guid(spa->spa_pending_vdev, 1410 device_guid) != NULL) 1411 break; 1412 } 1413 } 1414 } 1415 1416 return (spa); 1417 } 1418 1419 /* 1420 * Determine whether a pool with the given pool_guid exists. 1421 */ 1422 boolean_t 1423 spa_guid_exists(uint64_t pool_guid, uint64_t device_guid) 1424 { 1425 return (spa_by_guid(pool_guid, device_guid) != NULL); 1426 } 1427 1428 char * 1429 spa_strdup(const char *s) 1430 { 1431 size_t len; 1432 char *new; 1433 1434 len = strlen(s); 1435 new = kmem_alloc(len + 1, KM_SLEEP); 1436 bcopy(s, new, len); 1437 new[len] = '\0'; 1438 1439 return (new); 1440 } 1441 1442 void 1443 spa_strfree(char *s) 1444 { 1445 kmem_free(s, strlen(s) + 1); 1446 } 1447 1448 uint64_t 1449 spa_get_random(uint64_t range) 1450 { 1451 uint64_t r; 1452 1453 ASSERT(range != 0); 1454 1455 (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t)); 1456 1457 return (r % range); 1458 } 1459 1460 uint64_t 1461 spa_generate_guid(spa_t *spa) 1462 { 1463 uint64_t guid = spa_get_random(-1ULL); 1464 1465 if (spa != NULL) { 1466 while (guid == 0 || spa_guid_exists(spa_guid(spa), guid)) 1467 guid = spa_get_random(-1ULL); 1468 } else { 1469 while (guid == 0 || spa_guid_exists(guid, 0)) 1470 guid = spa_get_random(-1ULL); 1471 } 1472 1473 return (guid); 1474 } 1475 1476 void 1477 snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp) 1478 { 1479 char type[256]; 1480 char *checksum = NULL; 1481 char *compress = NULL; 1482 1483 if (bp != NULL) { 1484 if (BP_GET_TYPE(bp) & DMU_OT_NEWTYPE) { 1485 dmu_object_byteswap_t bswap = 1486 DMU_OT_BYTESWAP(BP_GET_TYPE(bp)); 1487 (void) snprintf(type, sizeof (type), "bswap %s %s", 1488 DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) ? 1489 "metadata" : "data", 1490 dmu_ot_byteswap[bswap].ob_name); 1491 } else { 1492 (void) strlcpy(type, dmu_ot[BP_GET_TYPE(bp)].ot_name, 1493 sizeof (type)); 1494 } 1495 if (!BP_IS_EMBEDDED(bp)) { 1496 checksum = 1497 zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name; 1498 } 1499 compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name; 1500 } 1501 1502 SNPRINTF_BLKPTR(snprintf, ' ', buf, buflen, bp, type, checksum, 1503 compress); 1504 } 1505 1506 void 1507 spa_freeze(spa_t *spa) 1508 { 1509 uint64_t freeze_txg = 0; 1510 1511 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1512 if (spa->spa_freeze_txg == UINT64_MAX) { 1513 freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE; 1514 spa->spa_freeze_txg = freeze_txg; 1515 } 1516 spa_config_exit(spa, SCL_ALL, FTAG); 1517 if (freeze_txg != 0) 1518 txg_wait_synced(spa_get_dsl(spa), freeze_txg); 1519 } 1520 1521 void 1522 zfs_panic_recover(const char *fmt, ...) 1523 { 1524 va_list adx; 1525 1526 va_start(adx, fmt); 1527 vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx); 1528 va_end(adx); 1529 } 1530 1531 /* 1532 * This is a stripped-down version of strtoull, suitable only for converting 1533 * lowercase hexadecimal numbers that don't overflow. 1534 */ 1535 uint64_t 1536 zfs_strtonum(const char *str, char **nptr) 1537 { 1538 uint64_t val = 0; 1539 char c; 1540 int digit; 1541 1542 while ((c = *str) != '\0') { 1543 if (c >= '0' && c <= '9') 1544 digit = c - '0'; 1545 else if (c >= 'a' && c <= 'f') 1546 digit = 10 + c - 'a'; 1547 else 1548 break; 1549 1550 val *= 16; 1551 val += digit; 1552 1553 str++; 1554 } 1555 1556 if (nptr) 1557 *nptr = (char *)str; 1558 1559 return (val); 1560 } 1561 1562 /* 1563 * ========================================================================== 1564 * Accessor functions 1565 * ========================================================================== 1566 */ 1567 1568 boolean_t 1569 spa_shutting_down(spa_t *spa) 1570 { 1571 return (spa->spa_async_suspended); 1572 } 1573 1574 dsl_pool_t * 1575 spa_get_dsl(spa_t *spa) 1576 { 1577 return (spa->spa_dsl_pool); 1578 } 1579 1580 boolean_t 1581 spa_is_initializing(spa_t *spa) 1582 { 1583 return (spa->spa_is_initializing); 1584 } 1585 1586 boolean_t 1587 spa_indirect_vdevs_loaded(spa_t *spa) 1588 { 1589 return (spa->spa_indirect_vdevs_loaded); 1590 } 1591 1592 blkptr_t * 1593 spa_get_rootblkptr(spa_t *spa) 1594 { 1595 return (&spa->spa_ubsync.ub_rootbp); 1596 } 1597 1598 void 1599 spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp) 1600 { 1601 spa->spa_uberblock.ub_rootbp = *bp; 1602 } 1603 1604 void 1605 spa_altroot(spa_t *spa, char *buf, size_t buflen) 1606 { 1607 if (spa->spa_root == NULL) 1608 buf[0] = '\0'; 1609 else 1610 (void) strncpy(buf, spa->spa_root, buflen); 1611 } 1612 1613 int 1614 spa_sync_pass(spa_t *spa) 1615 { 1616 return (spa->spa_sync_pass); 1617 } 1618 1619 char * 1620 spa_name(spa_t *spa) 1621 { 1622 return (spa->spa_name); 1623 } 1624 1625 uint64_t 1626 spa_guid(spa_t *spa) 1627 { 1628 dsl_pool_t *dp = spa_get_dsl(spa); 1629 uint64_t guid; 1630 1631 /* 1632 * If we fail to parse the config during spa_load(), we can go through 1633 * the error path (which posts an ereport) and end up here with no root 1634 * vdev. We stash the original pool guid in 'spa_config_guid' to handle 1635 * this case. 1636 */ 1637 if (spa->spa_root_vdev == NULL) 1638 return (spa->spa_config_guid); 1639 1640 guid = spa->spa_last_synced_guid != 0 ? 1641 spa->spa_last_synced_guid : spa->spa_root_vdev->vdev_guid; 1642 1643 /* 1644 * Return the most recently synced out guid unless we're 1645 * in syncing context. 1646 */ 1647 if (dp && dsl_pool_sync_context(dp)) 1648 return (spa->spa_root_vdev->vdev_guid); 1649 else 1650 return (guid); 1651 } 1652 1653 uint64_t 1654 spa_load_guid(spa_t *spa) 1655 { 1656 /* 1657 * This is a GUID that exists solely as a reference for the 1658 * purposes of the arc. It is generated at load time, and 1659 * is never written to persistent storage. 1660 */ 1661 return (spa->spa_load_guid); 1662 } 1663 1664 uint64_t 1665 spa_last_synced_txg(spa_t *spa) 1666 { 1667 return (spa->spa_ubsync.ub_txg); 1668 } 1669 1670 uint64_t 1671 spa_first_txg(spa_t *spa) 1672 { 1673 return (spa->spa_first_txg); 1674 } 1675 1676 uint64_t 1677 spa_syncing_txg(spa_t *spa) 1678 { 1679 return (spa->spa_syncing_txg); 1680 } 1681 1682 /* 1683 * Return the last txg where data can be dirtied. The final txgs 1684 * will be used to just clear out any deferred frees that remain. 1685 */ 1686 uint64_t 1687 spa_final_dirty_txg(spa_t *spa) 1688 { 1689 return (spa->spa_final_txg - TXG_DEFER_SIZE); 1690 } 1691 1692 pool_state_t 1693 spa_state(spa_t *spa) 1694 { 1695 return (spa->spa_state); 1696 } 1697 1698 spa_load_state_t 1699 spa_load_state(spa_t *spa) 1700 { 1701 return (spa->spa_load_state); 1702 } 1703 1704 uint64_t 1705 spa_freeze_txg(spa_t *spa) 1706 { 1707 return (spa->spa_freeze_txg); 1708 } 1709 1710 /* ARGSUSED */ 1711 uint64_t 1712 spa_get_worst_case_asize(spa_t *spa, uint64_t lsize) 1713 { 1714 return (lsize * spa_asize_inflation); 1715 } 1716 1717 /* 1718 * Return the amount of slop space in bytes. It is 1/32 of the pool (3.2%), 1719 * or at least 128MB, unless that would cause it to be more than half the 1720 * pool size. 1721 * 1722 * See the comment above spa_slop_shift for details. 1723 */ 1724 uint64_t 1725 spa_get_slop_space(spa_t *spa) 1726 { 1727 uint64_t space = spa_get_dspace(spa); 1728 return (MAX(space >> spa_slop_shift, MIN(space >> 1, spa_min_slop))); 1729 } 1730 1731 uint64_t 1732 spa_get_dspace(spa_t *spa) 1733 { 1734 return (spa->spa_dspace); 1735 } 1736 1737 uint64_t 1738 spa_get_checkpoint_space(spa_t *spa) 1739 { 1740 return (spa->spa_checkpoint_info.sci_dspace); 1741 } 1742 1743 void 1744 spa_update_dspace(spa_t *spa) 1745 { 1746 spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) + 1747 ddt_get_dedup_dspace(spa); 1748 if (spa->spa_vdev_removal != NULL) { 1749 /* 1750 * We can't allocate from the removing device, so 1751 * subtract its size. This prevents the DMU/DSL from 1752 * filling up the (now smaller) pool while we are in the 1753 * middle of removing the device. 1754 * 1755 * Note that the DMU/DSL doesn't actually know or care 1756 * how much space is allocated (it does its own tracking 1757 * of how much space has been logically used). So it 1758 * doesn't matter that the data we are moving may be 1759 * allocated twice (on the old device and the new 1760 * device). 1761 */ 1762 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 1763 vdev_t *vd = 1764 vdev_lookup_top(spa, spa->spa_vdev_removal->svr_vdev_id); 1765 spa->spa_dspace -= spa_deflate(spa) ? 1766 vd->vdev_stat.vs_dspace : vd->vdev_stat.vs_space; 1767 spa_config_exit(spa, SCL_VDEV, FTAG); 1768 } 1769 } 1770 1771 /* 1772 * Return the failure mode that has been set to this pool. The default 1773 * behavior will be to block all I/Os when a complete failure occurs. 1774 */ 1775 uint8_t 1776 spa_get_failmode(spa_t *spa) 1777 { 1778 return (spa->spa_failmode); 1779 } 1780 1781 boolean_t 1782 spa_suspended(spa_t *spa) 1783 { 1784 return (spa->spa_suspended); 1785 } 1786 1787 uint64_t 1788 spa_version(spa_t *spa) 1789 { 1790 return (spa->spa_ubsync.ub_version); 1791 } 1792 1793 boolean_t 1794 spa_deflate(spa_t *spa) 1795 { 1796 return (spa->spa_deflate); 1797 } 1798 1799 metaslab_class_t * 1800 spa_normal_class(spa_t *spa) 1801 { 1802 return (spa->spa_normal_class); 1803 } 1804 1805 metaslab_class_t * 1806 spa_log_class(spa_t *spa) 1807 { 1808 return (spa->spa_log_class); 1809 } 1810 1811 void 1812 spa_evicting_os_register(spa_t *spa, objset_t *os) 1813 { 1814 mutex_enter(&spa->spa_evicting_os_lock); 1815 list_insert_head(&spa->spa_evicting_os_list, os); 1816 mutex_exit(&spa->spa_evicting_os_lock); 1817 } 1818 1819 void 1820 spa_evicting_os_deregister(spa_t *spa, objset_t *os) 1821 { 1822 mutex_enter(&spa->spa_evicting_os_lock); 1823 list_remove(&spa->spa_evicting_os_list, os); 1824 cv_broadcast(&spa->spa_evicting_os_cv); 1825 mutex_exit(&spa->spa_evicting_os_lock); 1826 } 1827 1828 void 1829 spa_evicting_os_wait(spa_t *spa) 1830 { 1831 mutex_enter(&spa->spa_evicting_os_lock); 1832 while (!list_is_empty(&spa->spa_evicting_os_list)) 1833 cv_wait(&spa->spa_evicting_os_cv, &spa->spa_evicting_os_lock); 1834 mutex_exit(&spa->spa_evicting_os_lock); 1835 1836 dmu_buf_user_evict_wait(); 1837 } 1838 1839 int 1840 spa_max_replication(spa_t *spa) 1841 { 1842 /* 1843 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to 1844 * handle BPs with more than one DVA allocated. Set our max 1845 * replication level accordingly. 1846 */ 1847 if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS) 1848 return (1); 1849 return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override)); 1850 } 1851 1852 int 1853 spa_prev_software_version(spa_t *spa) 1854 { 1855 return (spa->spa_prev_software_version); 1856 } 1857 1858 uint64_t 1859 spa_deadman_synctime(spa_t *spa) 1860 { 1861 return (spa->spa_deadman_synctime); 1862 } 1863 1864 uint64_t 1865 dva_get_dsize_sync(spa_t *spa, const dva_t *dva) 1866 { 1867 uint64_t asize = DVA_GET_ASIZE(dva); 1868 uint64_t dsize = asize; 1869 1870 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1871 1872 if (asize != 0 && spa->spa_deflate) { 1873 vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva)); 1874 dsize = (asize >> SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio; 1875 } 1876 1877 return (dsize); 1878 } 1879 1880 uint64_t 1881 bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp) 1882 { 1883 uint64_t dsize = 0; 1884 1885 for (int d = 0; d < BP_GET_NDVAS(bp); d++) 1886 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]); 1887 1888 return (dsize); 1889 } 1890 1891 uint64_t 1892 bp_get_dsize(spa_t *spa, const blkptr_t *bp) 1893 { 1894 uint64_t dsize = 0; 1895 1896 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 1897 1898 for (int d = 0; d < BP_GET_NDVAS(bp); d++) 1899 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]); 1900 1901 spa_config_exit(spa, SCL_VDEV, FTAG); 1902 1903 return (dsize); 1904 } 1905 1906 /* 1907 * ========================================================================== 1908 * Initialization and Termination 1909 * ========================================================================== 1910 */ 1911 1912 static int 1913 spa_name_compare(const void *a1, const void *a2) 1914 { 1915 const spa_t *s1 = a1; 1916 const spa_t *s2 = a2; 1917 int s; 1918 1919 s = strcmp(s1->spa_name, s2->spa_name); 1920 if (s > 0) 1921 return (1); 1922 if (s < 0) 1923 return (-1); 1924 return (0); 1925 } 1926 1927 int 1928 spa_busy(void) 1929 { 1930 return (spa_active_count); 1931 } 1932 1933 void 1934 spa_boot_init() 1935 { 1936 spa_config_load(); 1937 } 1938 1939 void 1940 spa_init(int mode) 1941 { 1942 mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL); 1943 mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL); 1944 mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL); 1945 cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL); 1946 1947 avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t), 1948 offsetof(spa_t, spa_avl)); 1949 1950 avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t), 1951 offsetof(spa_aux_t, aux_avl)); 1952 1953 avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t), 1954 offsetof(spa_aux_t, aux_avl)); 1955 1956 spa_mode_global = mode; 1957 1958 #ifdef _KERNEL 1959 spa_arch_init(); 1960 #else 1961 if (spa_mode_global != FREAD && dprintf_find_string("watch")) { 1962 arc_procfd = open("/proc/self/ctl", O_WRONLY); 1963 if (arc_procfd == -1) { 1964 perror("could not enable watchpoints: " 1965 "opening /proc/self/ctl failed: "); 1966 } else { 1967 arc_watch = B_TRUE; 1968 } 1969 } 1970 #endif 1971 1972 refcount_init(); 1973 unique_init(); 1974 range_tree_init(); 1975 metaslab_alloc_trace_init(); 1976 zio_init(); 1977 dmu_init(); 1978 zil_init(); 1979 vdev_cache_stat_init(); 1980 zfs_prop_init(); 1981 zpool_prop_init(); 1982 zpool_feature_init(); 1983 spa_config_load(); 1984 l2arc_start(); 1985 } 1986 1987 void 1988 spa_fini(void) 1989 { 1990 l2arc_stop(); 1991 1992 spa_evict_all(); 1993 1994 vdev_cache_stat_fini(); 1995 zil_fini(); 1996 dmu_fini(); 1997 zio_fini(); 1998 metaslab_alloc_trace_fini(); 1999 range_tree_fini(); 2000 unique_fini(); 2001 refcount_fini(); 2002 2003 avl_destroy(&spa_namespace_avl); 2004 avl_destroy(&spa_spare_avl); 2005 avl_destroy(&spa_l2cache_avl); 2006 2007 cv_destroy(&spa_namespace_cv); 2008 mutex_destroy(&spa_namespace_lock); 2009 mutex_destroy(&spa_spare_lock); 2010 mutex_destroy(&spa_l2cache_lock); 2011 } 2012 2013 /* 2014 * Return whether this pool has slogs. No locking needed. 2015 * It's not a problem if the wrong answer is returned as it's only for 2016 * performance and not correctness 2017 */ 2018 boolean_t 2019 spa_has_slogs(spa_t *spa) 2020 { 2021 return (spa->spa_log_class->mc_rotor != NULL); 2022 } 2023 2024 spa_log_state_t 2025 spa_get_log_state(spa_t *spa) 2026 { 2027 return (spa->spa_log_state); 2028 } 2029 2030 void 2031 spa_set_log_state(spa_t *spa, spa_log_state_t state) 2032 { 2033 spa->spa_log_state = state; 2034 } 2035 2036 boolean_t 2037 spa_is_root(spa_t *spa) 2038 { 2039 return (spa->spa_is_root); 2040 } 2041 2042 boolean_t 2043 spa_writeable(spa_t *spa) 2044 { 2045 return (!!(spa->spa_mode & FWRITE) && spa->spa_trust_config); 2046 } 2047 2048 /* 2049 * Returns true if there is a pending sync task in any of the current 2050 * syncing txg, the current quiescing txg, or the current open txg. 2051 */ 2052 boolean_t 2053 spa_has_pending_synctask(spa_t *spa) 2054 { 2055 return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks) || 2056 !txg_all_lists_empty(&spa->spa_dsl_pool->dp_early_sync_tasks)); 2057 } 2058 2059 int 2060 spa_mode(spa_t *spa) 2061 { 2062 return (spa->spa_mode); 2063 } 2064 2065 uint64_t 2066 spa_bootfs(spa_t *spa) 2067 { 2068 return (spa->spa_bootfs); 2069 } 2070 2071 uint64_t 2072 spa_delegation(spa_t *spa) 2073 { 2074 return (spa->spa_delegation); 2075 } 2076 2077 objset_t * 2078 spa_meta_objset(spa_t *spa) 2079 { 2080 return (spa->spa_meta_objset); 2081 } 2082 2083 enum zio_checksum 2084 spa_dedup_checksum(spa_t *spa) 2085 { 2086 return (spa->spa_dedup_checksum); 2087 } 2088 2089 /* 2090 * Reset pool scan stat per scan pass (or reboot). 2091 */ 2092 void 2093 spa_scan_stat_init(spa_t *spa) 2094 { 2095 /* data not stored on disk */ 2096 spa->spa_scan_pass_start = gethrestime_sec(); 2097 if (dsl_scan_is_paused_scrub(spa->spa_dsl_pool->dp_scan)) 2098 spa->spa_scan_pass_scrub_pause = spa->spa_scan_pass_start; 2099 else 2100 spa->spa_scan_pass_scrub_pause = 0; 2101 spa->spa_scan_pass_scrub_spent_paused = 0; 2102 spa->spa_scan_pass_exam = 0; 2103 vdev_scan_stat_init(spa->spa_root_vdev); 2104 } 2105 2106 /* 2107 * Get scan stats for zpool status reports 2108 */ 2109 int 2110 spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps) 2111 { 2112 dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL; 2113 2114 if (scn == NULL || scn->scn_phys.scn_func == POOL_SCAN_NONE) 2115 return (SET_ERROR(ENOENT)); 2116 bzero(ps, sizeof (pool_scan_stat_t)); 2117 2118 /* data stored on disk */ 2119 ps->pss_func = scn->scn_phys.scn_func; 2120 ps->pss_start_time = scn->scn_phys.scn_start_time; 2121 ps->pss_end_time = scn->scn_phys.scn_end_time; 2122 ps->pss_to_examine = scn->scn_phys.scn_to_examine; 2123 ps->pss_examined = scn->scn_phys.scn_examined; 2124 ps->pss_to_process = scn->scn_phys.scn_to_process; 2125 ps->pss_processed = scn->scn_phys.scn_processed; 2126 ps->pss_errors = scn->scn_phys.scn_errors; 2127 ps->pss_state = scn->scn_phys.scn_state; 2128 2129 /* data not stored on disk */ 2130 ps->pss_pass_start = spa->spa_scan_pass_start; 2131 ps->pss_pass_exam = spa->spa_scan_pass_exam; 2132 ps->pss_pass_scrub_pause = spa->spa_scan_pass_scrub_pause; 2133 ps->pss_pass_scrub_spent_paused = spa->spa_scan_pass_scrub_spent_paused; 2134 2135 return (0); 2136 } 2137 2138 int 2139 spa_maxblocksize(spa_t *spa) 2140 { 2141 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) 2142 return (SPA_MAXBLOCKSIZE); 2143 else 2144 return (SPA_OLD_MAXBLOCKSIZE); 2145 } 2146 2147 /* 2148 * Returns the txg that the last device removal completed. No indirect mappings 2149 * have been added since this txg. 2150 */ 2151 uint64_t 2152 spa_get_last_removal_txg(spa_t *spa) 2153 { 2154 uint64_t vdevid; 2155 uint64_t ret = -1ULL; 2156 2157 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 2158 /* 2159 * sr_prev_indirect_vdev is only modified while holding all the 2160 * config locks, so it is sufficient to hold SCL_VDEV as reader when 2161 * examining it. 2162 */ 2163 vdevid = spa->spa_removing_phys.sr_prev_indirect_vdev; 2164 2165 while (vdevid != -1ULL) { 2166 vdev_t *vd = vdev_lookup_top(spa, vdevid); 2167 vdev_indirect_births_t *vib = vd->vdev_indirect_births; 2168 2169 ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops); 2170 2171 /* 2172 * If the removal did not remap any data, we don't care. 2173 */ 2174 if (vdev_indirect_births_count(vib) != 0) { 2175 ret = vdev_indirect_births_last_entry_txg(vib); 2176 break; 2177 } 2178 2179 vdevid = vd->vdev_indirect_config.vic_prev_indirect_vdev; 2180 } 2181 spa_config_exit(spa, SCL_VDEV, FTAG); 2182 2183 IMPLY(ret != -1ULL, 2184 spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 2185 2186 return (ret); 2187 } 2188 2189 boolean_t 2190 spa_trust_config(spa_t *spa) 2191 { 2192 return (spa->spa_trust_config); 2193 } 2194 2195 uint64_t 2196 spa_missing_tvds_allowed(spa_t *spa) 2197 { 2198 return (spa->spa_missing_tvds_allowed); 2199 } 2200 2201 void 2202 spa_set_missing_tvds(spa_t *spa, uint64_t missing) 2203 { 2204 spa->spa_missing_tvds = missing; 2205 } 2206 2207 boolean_t 2208 spa_top_vdevs_spacemap_addressable(spa_t *spa) 2209 { 2210 vdev_t *rvd = spa->spa_root_vdev; 2211 for (uint64_t c = 0; c < rvd->vdev_children; c++) { 2212 if (!vdev_is_spacemap_addressable(rvd->vdev_child[c])) 2213 return (B_FALSE); 2214 } 2215 return (B_TRUE); 2216 } 2217 2218 boolean_t 2219 spa_has_checkpoint(spa_t *spa) 2220 { 2221 return (spa->spa_checkpoint_txg != 0); 2222 } 2223 2224 boolean_t 2225 spa_importing_readonly_checkpoint(spa_t *spa) 2226 { 2227 return ((spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT) && 2228 spa->spa_mode == FREAD); 2229 } 2230 2231 uint64_t 2232 spa_min_claim_txg(spa_t *spa) 2233 { 2234 uint64_t checkpoint_txg = spa->spa_uberblock.ub_checkpoint_txg; 2235 2236 if (checkpoint_txg != 0) 2237 return (checkpoint_txg + 1); 2238 2239 return (spa->spa_first_txg); 2240 } 2241 2242 /* 2243 * If there is a checkpoint, async destroys may consume more space from 2244 * the pool instead of freeing it. In an attempt to save the pool from 2245 * getting suspended when it is about to run out of space, we stop 2246 * processing async destroys. 2247 */ 2248 boolean_t 2249 spa_suspend_async_destroy(spa_t *spa) 2250 { 2251 dsl_pool_t *dp = spa_get_dsl(spa); 2252 2253 uint64_t unreserved = dsl_pool_unreserved_space(dp, 2254 ZFS_SPACE_CHECK_EXTRA_RESERVED); 2255 uint64_t used = dsl_dir_phys(dp->dp_root_dir)->dd_used_bytes; 2256 uint64_t avail = (unreserved > used) ? (unreserved - used) : 0; 2257 2258 if (spa_has_checkpoint(spa) && avail == 0) 2259 return (B_TRUE); 2260 2261 return (B_FALSE); 2262 } 2263