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 * A very restricted set of operations are always permitted, regardless of 342 * the amount of free space. These are the operations that call 343 * dsl_sync_task(ZFS_SPACE_CHECK_NONE), e.g. "zfs destroy". If these 344 * operations result in a net increase in the amount of space used, 345 * it is possible to run the pool completely out of space, causing it to 346 * be permanently read-only. 347 * 348 * Note that on very small pools, the slop space will be larger than 349 * 3.2%, in an effort to have it be at least spa_min_slop (128MB), 350 * but we never allow it to be more than half the pool size. 351 * 352 * See also the comments in zfs_space_check_t. 353 */ 354 int spa_slop_shift = 5; 355 uint64_t spa_min_slop = 128 * 1024 * 1024; 356 357 /* 358 * ========================================================================== 359 * SPA config locking 360 * ========================================================================== 361 */ 362 static void 363 spa_config_lock_init(spa_t *spa) 364 { 365 for (int i = 0; i < SCL_LOCKS; i++) { 366 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 367 mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL); 368 cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL); 369 refcount_create_untracked(&scl->scl_count); 370 scl->scl_writer = NULL; 371 scl->scl_write_wanted = 0; 372 } 373 } 374 375 static void 376 spa_config_lock_destroy(spa_t *spa) 377 { 378 for (int i = 0; i < SCL_LOCKS; i++) { 379 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 380 mutex_destroy(&scl->scl_lock); 381 cv_destroy(&scl->scl_cv); 382 refcount_destroy(&scl->scl_count); 383 ASSERT(scl->scl_writer == NULL); 384 ASSERT(scl->scl_write_wanted == 0); 385 } 386 } 387 388 int 389 spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw) 390 { 391 for (int i = 0; i < SCL_LOCKS; i++) { 392 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 393 if (!(locks & (1 << i))) 394 continue; 395 mutex_enter(&scl->scl_lock); 396 if (rw == RW_READER) { 397 if (scl->scl_writer || scl->scl_write_wanted) { 398 mutex_exit(&scl->scl_lock); 399 spa_config_exit(spa, locks & ((1 << i) - 1), 400 tag); 401 return (0); 402 } 403 } else { 404 ASSERT(scl->scl_writer != curthread); 405 if (!refcount_is_zero(&scl->scl_count)) { 406 mutex_exit(&scl->scl_lock); 407 spa_config_exit(spa, locks & ((1 << i) - 1), 408 tag); 409 return (0); 410 } 411 scl->scl_writer = curthread; 412 } 413 (void) refcount_add(&scl->scl_count, tag); 414 mutex_exit(&scl->scl_lock); 415 } 416 return (1); 417 } 418 419 void 420 spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw) 421 { 422 int wlocks_held = 0; 423 424 ASSERT3U(SCL_LOCKS, <, sizeof (wlocks_held) * NBBY); 425 426 for (int i = 0; i < SCL_LOCKS; i++) { 427 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 428 if (scl->scl_writer == curthread) 429 wlocks_held |= (1 << i); 430 if (!(locks & (1 << i))) 431 continue; 432 mutex_enter(&scl->scl_lock); 433 if (rw == RW_READER) { 434 while (scl->scl_writer || scl->scl_write_wanted) { 435 cv_wait(&scl->scl_cv, &scl->scl_lock); 436 } 437 } else { 438 ASSERT(scl->scl_writer != curthread); 439 while (!refcount_is_zero(&scl->scl_count)) { 440 scl->scl_write_wanted++; 441 cv_wait(&scl->scl_cv, &scl->scl_lock); 442 scl->scl_write_wanted--; 443 } 444 scl->scl_writer = curthread; 445 } 446 (void) refcount_add(&scl->scl_count, tag); 447 mutex_exit(&scl->scl_lock); 448 } 449 ASSERT3U(wlocks_held, <=, locks); 450 } 451 452 void 453 spa_config_exit(spa_t *spa, int locks, void *tag) 454 { 455 for (int i = SCL_LOCKS - 1; i >= 0; i--) { 456 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 457 if (!(locks & (1 << i))) 458 continue; 459 mutex_enter(&scl->scl_lock); 460 ASSERT(!refcount_is_zero(&scl->scl_count)); 461 if (refcount_remove(&scl->scl_count, tag) == 0) { 462 ASSERT(scl->scl_writer == NULL || 463 scl->scl_writer == curthread); 464 scl->scl_writer = NULL; /* OK in either case */ 465 cv_broadcast(&scl->scl_cv); 466 } 467 mutex_exit(&scl->scl_lock); 468 } 469 } 470 471 int 472 spa_config_held(spa_t *spa, int locks, krw_t rw) 473 { 474 int locks_held = 0; 475 476 for (int i = 0; i < SCL_LOCKS; i++) { 477 spa_config_lock_t *scl = &spa->spa_config_lock[i]; 478 if (!(locks & (1 << i))) 479 continue; 480 if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) || 481 (rw == RW_WRITER && scl->scl_writer == curthread)) 482 locks_held |= 1 << i; 483 } 484 485 return (locks_held); 486 } 487 488 /* 489 * ========================================================================== 490 * SPA namespace functions 491 * ========================================================================== 492 */ 493 494 /* 495 * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held. 496 * Returns NULL if no matching spa_t is found. 497 */ 498 spa_t * 499 spa_lookup(const char *name) 500 { 501 static spa_t search; /* spa_t is large; don't allocate on stack */ 502 spa_t *spa; 503 avl_index_t where; 504 char *cp; 505 506 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 507 508 (void) strlcpy(search.spa_name, name, sizeof (search.spa_name)); 509 510 /* 511 * If it's a full dataset name, figure out the pool name and 512 * just use that. 513 */ 514 cp = strpbrk(search.spa_name, "/@#"); 515 if (cp != NULL) 516 *cp = '\0'; 517 518 spa = avl_find(&spa_namespace_avl, &search, &where); 519 520 return (spa); 521 } 522 523 /* 524 * Fires when spa_sync has not completed within zfs_deadman_synctime_ms. 525 * If the zfs_deadman_enabled flag is set then it inspects all vdev queues 526 * looking for potentially hung I/Os. 527 */ 528 void 529 spa_deadman(void *arg) 530 { 531 spa_t *spa = arg; 532 533 /* 534 * Disable the deadman timer if the pool is suspended. 535 */ 536 if (spa_suspended(spa)) { 537 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 538 return; 539 } 540 541 zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu", 542 (gethrtime() - spa->spa_sync_starttime) / NANOSEC, 543 ++spa->spa_deadman_calls); 544 if (zfs_deadman_enabled) 545 vdev_deadman(spa->spa_root_vdev); 546 } 547 548 /* 549 * Create an uninitialized spa_t with the given name. Requires 550 * spa_namespace_lock. The caller must ensure that the spa_t doesn't already 551 * exist by calling spa_lookup() first. 552 */ 553 spa_t * 554 spa_add(const char *name, nvlist_t *config, const char *altroot) 555 { 556 spa_t *spa; 557 spa_config_dirent_t *dp; 558 cyc_handler_t hdlr; 559 cyc_time_t when; 560 561 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 562 563 spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP); 564 565 mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL); 566 mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL); 567 mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL); 568 mutex_init(&spa->spa_evicting_os_lock, NULL, MUTEX_DEFAULT, NULL); 569 mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL); 570 mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL); 571 mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL); 572 mutex_init(&spa->spa_cksum_tmpls_lock, NULL, MUTEX_DEFAULT, NULL); 573 mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL); 574 mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL); 575 mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL); 576 mutex_init(&spa->spa_iokstat_lock, NULL, MUTEX_DEFAULT, NULL); 577 mutex_init(&spa->spa_alloc_lock, NULL, MUTEX_DEFAULT, NULL); 578 579 cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL); 580 cv_init(&spa->spa_evicting_os_cv, NULL, CV_DEFAULT, NULL); 581 cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL); 582 cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL); 583 cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL); 584 585 for (int t = 0; t < TXG_SIZE; t++) 586 bplist_create(&spa->spa_free_bplist[t]); 587 588 (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name)); 589 spa->spa_state = POOL_STATE_UNINITIALIZED; 590 spa->spa_freeze_txg = UINT64_MAX; 591 spa->spa_final_txg = UINT64_MAX; 592 spa->spa_load_max_txg = UINT64_MAX; 593 spa->spa_proc = &p0; 594 spa->spa_proc_state = SPA_PROC_NONE; 595 596 hdlr.cyh_func = spa_deadman; 597 hdlr.cyh_arg = spa; 598 hdlr.cyh_level = CY_LOW_LEVEL; 599 600 spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime_ms); 601 602 /* 603 * This determines how often we need to check for hung I/Os after 604 * the cyclic has already fired. Since checking for hung I/Os is 605 * an expensive operation we don't want to check too frequently. 606 * Instead wait for 5 seconds before checking again. 607 */ 608 when.cyt_interval = MSEC2NSEC(zfs_deadman_checktime_ms); 609 when.cyt_when = CY_INFINITY; 610 mutex_enter(&cpu_lock); 611 spa->spa_deadman_cycid = cyclic_add(&hdlr, &when); 612 mutex_exit(&cpu_lock); 613 614 refcount_create(&spa->spa_refcount); 615 spa_config_lock_init(spa); 616 617 avl_add(&spa_namespace_avl, spa); 618 619 /* 620 * Set the alternate root, if there is one. 621 */ 622 if (altroot) { 623 spa->spa_root = spa_strdup(altroot); 624 spa_active_count++; 625 } 626 627 avl_create(&spa->spa_alloc_tree, zio_bookmark_compare, 628 sizeof (zio_t), offsetof(zio_t, io_alloc_node)); 629 630 /* 631 * Every pool starts with the default cachefile 632 */ 633 list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t), 634 offsetof(spa_config_dirent_t, scd_link)); 635 636 dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP); 637 dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path); 638 list_insert_head(&spa->spa_config_list, dp); 639 640 VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME, 641 KM_SLEEP) == 0); 642 643 if (config != NULL) { 644 nvlist_t *features; 645 646 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ, 647 &features) == 0) { 648 VERIFY(nvlist_dup(features, &spa->spa_label_features, 649 0) == 0); 650 } 651 652 VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0); 653 } 654 655 if (spa->spa_label_features == NULL) { 656 VERIFY(nvlist_alloc(&spa->spa_label_features, NV_UNIQUE_NAME, 657 KM_SLEEP) == 0); 658 } 659 660 spa->spa_iokstat = kstat_create("zfs", 0, name, 661 "disk", KSTAT_TYPE_IO, 1, 0); 662 if (spa->spa_iokstat) { 663 spa->spa_iokstat->ks_lock = &spa->spa_iokstat_lock; 664 kstat_install(spa->spa_iokstat); 665 } 666 667 spa->spa_debug = ((zfs_flags & ZFS_DEBUG_SPA) != 0); 668 669 spa->spa_min_ashift = INT_MAX; 670 spa->spa_max_ashift = 0; 671 672 /* 673 * As a pool is being created, treat all features as disabled by 674 * setting SPA_FEATURE_DISABLED for all entries in the feature 675 * refcount cache. 676 */ 677 for (int i = 0; i < SPA_FEATURES; i++) { 678 spa->spa_feat_refcount_cache[i] = SPA_FEATURE_DISABLED; 679 } 680 681 return (spa); 682 } 683 684 /* 685 * Removes a spa_t from the namespace, freeing up any memory used. Requires 686 * spa_namespace_lock. This is called only after the spa_t has been closed and 687 * deactivated. 688 */ 689 void 690 spa_remove(spa_t *spa) 691 { 692 spa_config_dirent_t *dp; 693 694 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 695 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 696 ASSERT3U(refcount_count(&spa->spa_refcount), ==, 0); 697 698 nvlist_free(spa->spa_config_splitting); 699 700 avl_remove(&spa_namespace_avl, spa); 701 cv_broadcast(&spa_namespace_cv); 702 703 if (spa->spa_root) { 704 spa_strfree(spa->spa_root); 705 spa_active_count--; 706 } 707 708 while ((dp = list_head(&spa->spa_config_list)) != NULL) { 709 list_remove(&spa->spa_config_list, dp); 710 if (dp->scd_path != NULL) 711 spa_strfree(dp->scd_path); 712 kmem_free(dp, sizeof (spa_config_dirent_t)); 713 } 714 715 avl_destroy(&spa->spa_alloc_tree); 716 list_destroy(&spa->spa_config_list); 717 718 nvlist_free(spa->spa_label_features); 719 nvlist_free(spa->spa_load_info); 720 spa_config_set(spa, NULL); 721 722 mutex_enter(&cpu_lock); 723 if (spa->spa_deadman_cycid != CYCLIC_NONE) 724 cyclic_remove(spa->spa_deadman_cycid); 725 mutex_exit(&cpu_lock); 726 spa->spa_deadman_cycid = CYCLIC_NONE; 727 728 refcount_destroy(&spa->spa_refcount); 729 730 spa_config_lock_destroy(spa); 731 732 kstat_delete(spa->spa_iokstat); 733 spa->spa_iokstat = NULL; 734 735 for (int t = 0; t < TXG_SIZE; t++) 736 bplist_destroy(&spa->spa_free_bplist[t]); 737 738 zio_checksum_templates_free(spa); 739 740 cv_destroy(&spa->spa_async_cv); 741 cv_destroy(&spa->spa_evicting_os_cv); 742 cv_destroy(&spa->spa_proc_cv); 743 cv_destroy(&spa->spa_scrub_io_cv); 744 cv_destroy(&spa->spa_suspend_cv); 745 746 mutex_destroy(&spa->spa_alloc_lock); 747 mutex_destroy(&spa->spa_async_lock); 748 mutex_destroy(&spa->spa_errlist_lock); 749 mutex_destroy(&spa->spa_errlog_lock); 750 mutex_destroy(&spa->spa_evicting_os_lock); 751 mutex_destroy(&spa->spa_history_lock); 752 mutex_destroy(&spa->spa_proc_lock); 753 mutex_destroy(&spa->spa_props_lock); 754 mutex_destroy(&spa->spa_cksum_tmpls_lock); 755 mutex_destroy(&spa->spa_scrub_lock); 756 mutex_destroy(&spa->spa_suspend_lock); 757 mutex_destroy(&spa->spa_vdev_top_lock); 758 mutex_destroy(&spa->spa_iokstat_lock); 759 760 kmem_free(spa, sizeof (spa_t)); 761 } 762 763 /* 764 * Given a pool, return the next pool in the namespace, or NULL if there is 765 * none. If 'prev' is NULL, return the first pool. 766 */ 767 spa_t * 768 spa_next(spa_t *prev) 769 { 770 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 771 772 if (prev) 773 return (AVL_NEXT(&spa_namespace_avl, prev)); 774 else 775 return (avl_first(&spa_namespace_avl)); 776 } 777 778 /* 779 * ========================================================================== 780 * SPA refcount functions 781 * ========================================================================== 782 */ 783 784 /* 785 * Add a reference to the given spa_t. Must have at least one reference, or 786 * have the namespace lock held. 787 */ 788 void 789 spa_open_ref(spa_t *spa, void *tag) 790 { 791 ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref || 792 MUTEX_HELD(&spa_namespace_lock)); 793 (void) refcount_add(&spa->spa_refcount, tag); 794 } 795 796 /* 797 * Remove a reference to the given spa_t. Must have at least one reference, or 798 * have the namespace lock held. 799 */ 800 void 801 spa_close(spa_t *spa, void *tag) 802 { 803 ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref || 804 MUTEX_HELD(&spa_namespace_lock)); 805 (void) refcount_remove(&spa->spa_refcount, tag); 806 } 807 808 /* 809 * Remove a reference to the given spa_t held by a dsl dir that is 810 * being asynchronously released. Async releases occur from a taskq 811 * performing eviction of dsl datasets and dirs. The namespace lock 812 * isn't held and the hold by the object being evicted may contribute to 813 * spa_minref (e.g. dataset or directory released during pool export), 814 * so the asserts in spa_close() do not apply. 815 */ 816 void 817 spa_async_close(spa_t *spa, void *tag) 818 { 819 (void) refcount_remove(&spa->spa_refcount, tag); 820 } 821 822 /* 823 * Check to see if the spa refcount is zero. Must be called with 824 * spa_namespace_lock held. We really compare against spa_minref, which is the 825 * number of references acquired when opening a pool 826 */ 827 boolean_t 828 spa_refcount_zero(spa_t *spa) 829 { 830 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 831 832 return (refcount_count(&spa->spa_refcount) == spa->spa_minref); 833 } 834 835 /* 836 * ========================================================================== 837 * SPA spare and l2cache tracking 838 * ========================================================================== 839 */ 840 841 /* 842 * Hot spares and cache devices are tracked using the same code below, 843 * for 'auxiliary' devices. 844 */ 845 846 typedef struct spa_aux { 847 uint64_t aux_guid; 848 uint64_t aux_pool; 849 avl_node_t aux_avl; 850 int aux_count; 851 } spa_aux_t; 852 853 static int 854 spa_aux_compare(const void *a, const void *b) 855 { 856 const spa_aux_t *sa = a; 857 const spa_aux_t *sb = b; 858 859 if (sa->aux_guid < sb->aux_guid) 860 return (-1); 861 else if (sa->aux_guid > sb->aux_guid) 862 return (1); 863 else 864 return (0); 865 } 866 867 void 868 spa_aux_add(vdev_t *vd, avl_tree_t *avl) 869 { 870 avl_index_t where; 871 spa_aux_t search; 872 spa_aux_t *aux; 873 874 search.aux_guid = vd->vdev_guid; 875 if ((aux = avl_find(avl, &search, &where)) != NULL) { 876 aux->aux_count++; 877 } else { 878 aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP); 879 aux->aux_guid = vd->vdev_guid; 880 aux->aux_count = 1; 881 avl_insert(avl, aux, where); 882 } 883 } 884 885 void 886 spa_aux_remove(vdev_t *vd, avl_tree_t *avl) 887 { 888 spa_aux_t search; 889 spa_aux_t *aux; 890 avl_index_t where; 891 892 search.aux_guid = vd->vdev_guid; 893 aux = avl_find(avl, &search, &where); 894 895 ASSERT(aux != NULL); 896 897 if (--aux->aux_count == 0) { 898 avl_remove(avl, aux); 899 kmem_free(aux, sizeof (spa_aux_t)); 900 } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) { 901 aux->aux_pool = 0ULL; 902 } 903 } 904 905 boolean_t 906 spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl) 907 { 908 spa_aux_t search, *found; 909 910 search.aux_guid = guid; 911 found = avl_find(avl, &search, NULL); 912 913 if (pool) { 914 if (found) 915 *pool = found->aux_pool; 916 else 917 *pool = 0ULL; 918 } 919 920 if (refcnt) { 921 if (found) 922 *refcnt = found->aux_count; 923 else 924 *refcnt = 0; 925 } 926 927 return (found != NULL); 928 } 929 930 void 931 spa_aux_activate(vdev_t *vd, avl_tree_t *avl) 932 { 933 spa_aux_t search, *found; 934 avl_index_t where; 935 936 search.aux_guid = vd->vdev_guid; 937 found = avl_find(avl, &search, &where); 938 ASSERT(found != NULL); 939 ASSERT(found->aux_pool == 0ULL); 940 941 found->aux_pool = spa_guid(vd->vdev_spa); 942 } 943 944 /* 945 * Spares are tracked globally due to the following constraints: 946 * 947 * - A spare may be part of multiple pools. 948 * - A spare may be added to a pool even if it's actively in use within 949 * another pool. 950 * - A spare in use in any pool can only be the source of a replacement if 951 * the target is a spare in the same pool. 952 * 953 * We keep track of all spares on the system through the use of a reference 954 * counted AVL tree. When a vdev is added as a spare, or used as a replacement 955 * spare, then we bump the reference count in the AVL tree. In addition, we set 956 * the 'vdev_isspare' member to indicate that the device is a spare (active or 957 * inactive). When a spare is made active (used to replace a device in the 958 * pool), we also keep track of which pool its been made a part of. 959 * 960 * The 'spa_spare_lock' protects the AVL tree. These functions are normally 961 * called under the spa_namespace lock as part of vdev reconfiguration. The 962 * separate spare lock exists for the status query path, which does not need to 963 * be completely consistent with respect to other vdev configuration changes. 964 */ 965 966 static int 967 spa_spare_compare(const void *a, const void *b) 968 { 969 return (spa_aux_compare(a, b)); 970 } 971 972 void 973 spa_spare_add(vdev_t *vd) 974 { 975 mutex_enter(&spa_spare_lock); 976 ASSERT(!vd->vdev_isspare); 977 spa_aux_add(vd, &spa_spare_avl); 978 vd->vdev_isspare = B_TRUE; 979 mutex_exit(&spa_spare_lock); 980 } 981 982 void 983 spa_spare_remove(vdev_t *vd) 984 { 985 mutex_enter(&spa_spare_lock); 986 ASSERT(vd->vdev_isspare); 987 spa_aux_remove(vd, &spa_spare_avl); 988 vd->vdev_isspare = B_FALSE; 989 mutex_exit(&spa_spare_lock); 990 } 991 992 boolean_t 993 spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt) 994 { 995 boolean_t found; 996 997 mutex_enter(&spa_spare_lock); 998 found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl); 999 mutex_exit(&spa_spare_lock); 1000 1001 return (found); 1002 } 1003 1004 void 1005 spa_spare_activate(vdev_t *vd) 1006 { 1007 mutex_enter(&spa_spare_lock); 1008 ASSERT(vd->vdev_isspare); 1009 spa_aux_activate(vd, &spa_spare_avl); 1010 mutex_exit(&spa_spare_lock); 1011 } 1012 1013 /* 1014 * Level 2 ARC devices are tracked globally for the same reasons as spares. 1015 * Cache devices currently only support one pool per cache device, and so 1016 * for these devices the aux reference count is currently unused beyond 1. 1017 */ 1018 1019 static int 1020 spa_l2cache_compare(const void *a, const void *b) 1021 { 1022 return (spa_aux_compare(a, b)); 1023 } 1024 1025 void 1026 spa_l2cache_add(vdev_t *vd) 1027 { 1028 mutex_enter(&spa_l2cache_lock); 1029 ASSERT(!vd->vdev_isl2cache); 1030 spa_aux_add(vd, &spa_l2cache_avl); 1031 vd->vdev_isl2cache = B_TRUE; 1032 mutex_exit(&spa_l2cache_lock); 1033 } 1034 1035 void 1036 spa_l2cache_remove(vdev_t *vd) 1037 { 1038 mutex_enter(&spa_l2cache_lock); 1039 ASSERT(vd->vdev_isl2cache); 1040 spa_aux_remove(vd, &spa_l2cache_avl); 1041 vd->vdev_isl2cache = B_FALSE; 1042 mutex_exit(&spa_l2cache_lock); 1043 } 1044 1045 boolean_t 1046 spa_l2cache_exists(uint64_t guid, uint64_t *pool) 1047 { 1048 boolean_t found; 1049 1050 mutex_enter(&spa_l2cache_lock); 1051 found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl); 1052 mutex_exit(&spa_l2cache_lock); 1053 1054 return (found); 1055 } 1056 1057 void 1058 spa_l2cache_activate(vdev_t *vd) 1059 { 1060 mutex_enter(&spa_l2cache_lock); 1061 ASSERT(vd->vdev_isl2cache); 1062 spa_aux_activate(vd, &spa_l2cache_avl); 1063 mutex_exit(&spa_l2cache_lock); 1064 } 1065 1066 /* 1067 * ========================================================================== 1068 * SPA vdev locking 1069 * ========================================================================== 1070 */ 1071 1072 /* 1073 * Lock the given spa_t for the purpose of adding or removing a vdev. 1074 * Grabs the global spa_namespace_lock plus the spa config lock for writing. 1075 * It returns the next transaction group for the spa_t. 1076 */ 1077 uint64_t 1078 spa_vdev_enter(spa_t *spa) 1079 { 1080 mutex_enter(&spa->spa_vdev_top_lock); 1081 mutex_enter(&spa_namespace_lock); 1082 return (spa_vdev_config_enter(spa)); 1083 } 1084 1085 /* 1086 * Internal implementation for spa_vdev_enter(). Used when a vdev 1087 * operation requires multiple syncs (i.e. removing a device) while 1088 * keeping the spa_namespace_lock held. 1089 */ 1090 uint64_t 1091 spa_vdev_config_enter(spa_t *spa) 1092 { 1093 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1094 1095 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); 1096 1097 return (spa_last_synced_txg(spa) + 1); 1098 } 1099 1100 /* 1101 * Used in combination with spa_vdev_config_enter() to allow the syncing 1102 * of multiple transactions without releasing the spa_namespace_lock. 1103 */ 1104 void 1105 spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag) 1106 { 1107 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1108 1109 int config_changed = B_FALSE; 1110 1111 ASSERT(txg > spa_last_synced_txg(spa)); 1112 1113 spa->spa_pending_vdev = NULL; 1114 1115 /* 1116 * Reassess the DTLs. 1117 */ 1118 vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE); 1119 1120 if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) { 1121 config_changed = B_TRUE; 1122 spa->spa_config_generation++; 1123 } 1124 1125 /* 1126 * Verify the metaslab classes. 1127 */ 1128 ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0); 1129 ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0); 1130 1131 spa_config_exit(spa, SCL_ALL, spa); 1132 1133 /* 1134 * Panic the system if the specified tag requires it. This 1135 * is useful for ensuring that configurations are updated 1136 * transactionally. 1137 */ 1138 if (zio_injection_enabled) 1139 zio_handle_panic_injection(spa, tag, 0); 1140 1141 /* 1142 * Note: this txg_wait_synced() is important because it ensures 1143 * that there won't be more than one config change per txg. 1144 * This allows us to use the txg as the generation number. 1145 */ 1146 if (error == 0) 1147 txg_wait_synced(spa->spa_dsl_pool, txg); 1148 1149 if (vd != NULL) { 1150 ASSERT(!vd->vdev_detached || vd->vdev_dtl_sm == NULL); 1151 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); 1152 vdev_free(vd); 1153 spa_config_exit(spa, SCL_ALL, spa); 1154 } 1155 1156 /* 1157 * If the config changed, update the config cache. 1158 */ 1159 if (config_changed) 1160 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1161 } 1162 1163 /* 1164 * Unlock the spa_t after adding or removing a vdev. Besides undoing the 1165 * locking of spa_vdev_enter(), we also want make sure the transactions have 1166 * synced to disk, and then update the global configuration cache with the new 1167 * information. 1168 */ 1169 int 1170 spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error) 1171 { 1172 spa_vdev_config_exit(spa, vd, txg, error, FTAG); 1173 mutex_exit(&spa_namespace_lock); 1174 mutex_exit(&spa->spa_vdev_top_lock); 1175 1176 return (error); 1177 } 1178 1179 /* 1180 * Lock the given spa_t for the purpose of changing vdev state. 1181 */ 1182 void 1183 spa_vdev_state_enter(spa_t *spa, int oplocks) 1184 { 1185 int locks = SCL_STATE_ALL | oplocks; 1186 1187 /* 1188 * Root pools may need to read of the underlying devfs filesystem 1189 * when opening up a vdev. Unfortunately if we're holding the 1190 * SCL_ZIO lock it will result in a deadlock when we try to issue 1191 * the read from the root filesystem. Instead we "prefetch" 1192 * the associated vnodes that we need prior to opening the 1193 * underlying devices and cache them so that we can prevent 1194 * any I/O when we are doing the actual open. 1195 */ 1196 if (spa_is_root(spa)) { 1197 int low = locks & ~(SCL_ZIO - 1); 1198 int high = locks & ~low; 1199 1200 spa_config_enter(spa, high, spa, RW_WRITER); 1201 vdev_hold(spa->spa_root_vdev); 1202 spa_config_enter(spa, low, spa, RW_WRITER); 1203 } else { 1204 spa_config_enter(spa, locks, spa, RW_WRITER); 1205 } 1206 spa->spa_vdev_locks = locks; 1207 } 1208 1209 int 1210 spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error) 1211 { 1212 boolean_t config_changed = B_FALSE; 1213 1214 if (vd != NULL || error == 0) 1215 vdev_dtl_reassess(vd ? vd->vdev_top : spa->spa_root_vdev, 1216 0, 0, B_FALSE); 1217 1218 if (vd != NULL) { 1219 vdev_state_dirty(vd->vdev_top); 1220 config_changed = B_TRUE; 1221 spa->spa_config_generation++; 1222 } 1223 1224 if (spa_is_root(spa)) 1225 vdev_rele(spa->spa_root_vdev); 1226 1227 ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL); 1228 spa_config_exit(spa, spa->spa_vdev_locks, spa); 1229 1230 /* 1231 * If anything changed, wait for it to sync. This ensures that, 1232 * from the system administrator's perspective, zpool(1M) commands 1233 * are synchronous. This is important for things like zpool offline: 1234 * when the command completes, you expect no further I/O from ZFS. 1235 */ 1236 if (vd != NULL) 1237 txg_wait_synced(spa->spa_dsl_pool, 0); 1238 1239 /* 1240 * If the config changed, update the config cache. 1241 */ 1242 if (config_changed) { 1243 mutex_enter(&spa_namespace_lock); 1244 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1245 mutex_exit(&spa_namespace_lock); 1246 } 1247 1248 return (error); 1249 } 1250 1251 /* 1252 * ========================================================================== 1253 * Miscellaneous functions 1254 * ========================================================================== 1255 */ 1256 1257 void 1258 spa_activate_mos_feature(spa_t *spa, const char *feature, dmu_tx_t *tx) 1259 { 1260 if (!nvlist_exists(spa->spa_label_features, feature)) { 1261 fnvlist_add_boolean(spa->spa_label_features, feature); 1262 /* 1263 * When we are creating the pool (tx_txg==TXG_INITIAL), we can't 1264 * dirty the vdev config because lock SCL_CONFIG is not held. 1265 * Thankfully, in this case we don't need to dirty the config 1266 * because it will be written out anyway when we finish 1267 * creating the pool. 1268 */ 1269 if (tx->tx_txg != TXG_INITIAL) 1270 vdev_config_dirty(spa->spa_root_vdev); 1271 } 1272 } 1273 1274 void 1275 spa_deactivate_mos_feature(spa_t *spa, const char *feature) 1276 { 1277 if (nvlist_remove_all(spa->spa_label_features, feature) == 0) 1278 vdev_config_dirty(spa->spa_root_vdev); 1279 } 1280 1281 /* 1282 * Rename a spa_t. 1283 */ 1284 int 1285 spa_rename(const char *name, const char *newname) 1286 { 1287 spa_t *spa; 1288 int err; 1289 1290 /* 1291 * Lookup the spa_t and grab the config lock for writing. We need to 1292 * actually open the pool so that we can sync out the necessary labels. 1293 * It's OK to call spa_open() with the namespace lock held because we 1294 * allow recursive calls for other reasons. 1295 */ 1296 mutex_enter(&spa_namespace_lock); 1297 if ((err = spa_open(name, &spa, FTAG)) != 0) { 1298 mutex_exit(&spa_namespace_lock); 1299 return (err); 1300 } 1301 1302 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1303 1304 avl_remove(&spa_namespace_avl, spa); 1305 (void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name)); 1306 avl_add(&spa_namespace_avl, spa); 1307 1308 /* 1309 * Sync all labels to disk with the new names by marking the root vdev 1310 * dirty and waiting for it to sync. It will pick up the new pool name 1311 * during the sync. 1312 */ 1313 vdev_config_dirty(spa->spa_root_vdev); 1314 1315 spa_config_exit(spa, SCL_ALL, FTAG); 1316 1317 txg_wait_synced(spa->spa_dsl_pool, 0); 1318 1319 /* 1320 * Sync the updated config cache. 1321 */ 1322 spa_write_cachefile(spa, B_FALSE, B_TRUE); 1323 1324 spa_close(spa, FTAG); 1325 1326 mutex_exit(&spa_namespace_lock); 1327 1328 return (0); 1329 } 1330 1331 /* 1332 * Return the spa_t associated with given pool_guid, if it exists. If 1333 * device_guid is non-zero, determine whether the pool exists *and* contains 1334 * a device with the specified device_guid. 1335 */ 1336 spa_t * 1337 spa_by_guid(uint64_t pool_guid, uint64_t device_guid) 1338 { 1339 spa_t *spa; 1340 avl_tree_t *t = &spa_namespace_avl; 1341 1342 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1343 1344 for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) { 1345 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1346 continue; 1347 if (spa->spa_root_vdev == NULL) 1348 continue; 1349 if (spa_guid(spa) == pool_guid) { 1350 if (device_guid == 0) 1351 break; 1352 1353 if (vdev_lookup_by_guid(spa->spa_root_vdev, 1354 device_guid) != NULL) 1355 break; 1356 1357 /* 1358 * Check any devices we may be in the process of adding. 1359 */ 1360 if (spa->spa_pending_vdev) { 1361 if (vdev_lookup_by_guid(spa->spa_pending_vdev, 1362 device_guid) != NULL) 1363 break; 1364 } 1365 } 1366 } 1367 1368 return (spa); 1369 } 1370 1371 /* 1372 * Determine whether a pool with the given pool_guid exists. 1373 */ 1374 boolean_t 1375 spa_guid_exists(uint64_t pool_guid, uint64_t device_guid) 1376 { 1377 return (spa_by_guid(pool_guid, device_guid) != NULL); 1378 } 1379 1380 char * 1381 spa_strdup(const char *s) 1382 { 1383 size_t len; 1384 char *new; 1385 1386 len = strlen(s); 1387 new = kmem_alloc(len + 1, KM_SLEEP); 1388 bcopy(s, new, len); 1389 new[len] = '\0'; 1390 1391 return (new); 1392 } 1393 1394 void 1395 spa_strfree(char *s) 1396 { 1397 kmem_free(s, strlen(s) + 1); 1398 } 1399 1400 uint64_t 1401 spa_get_random(uint64_t range) 1402 { 1403 uint64_t r; 1404 1405 ASSERT(range != 0); 1406 1407 (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t)); 1408 1409 return (r % range); 1410 } 1411 1412 uint64_t 1413 spa_generate_guid(spa_t *spa) 1414 { 1415 uint64_t guid = spa_get_random(-1ULL); 1416 1417 if (spa != NULL) { 1418 while (guid == 0 || spa_guid_exists(spa_guid(spa), guid)) 1419 guid = spa_get_random(-1ULL); 1420 } else { 1421 while (guid == 0 || spa_guid_exists(guid, 0)) 1422 guid = spa_get_random(-1ULL); 1423 } 1424 1425 return (guid); 1426 } 1427 1428 void 1429 snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp) 1430 { 1431 char type[256]; 1432 char *checksum = NULL; 1433 char *compress = NULL; 1434 1435 if (bp != NULL) { 1436 if (BP_GET_TYPE(bp) & DMU_OT_NEWTYPE) { 1437 dmu_object_byteswap_t bswap = 1438 DMU_OT_BYTESWAP(BP_GET_TYPE(bp)); 1439 (void) snprintf(type, sizeof (type), "bswap %s %s", 1440 DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) ? 1441 "metadata" : "data", 1442 dmu_ot_byteswap[bswap].ob_name); 1443 } else { 1444 (void) strlcpy(type, dmu_ot[BP_GET_TYPE(bp)].ot_name, 1445 sizeof (type)); 1446 } 1447 if (!BP_IS_EMBEDDED(bp)) { 1448 checksum = 1449 zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name; 1450 } 1451 compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name; 1452 } 1453 1454 SNPRINTF_BLKPTR(snprintf, ' ', buf, buflen, bp, type, checksum, 1455 compress); 1456 } 1457 1458 void 1459 spa_freeze(spa_t *spa) 1460 { 1461 uint64_t freeze_txg = 0; 1462 1463 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1464 if (spa->spa_freeze_txg == UINT64_MAX) { 1465 freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE; 1466 spa->spa_freeze_txg = freeze_txg; 1467 } 1468 spa_config_exit(spa, SCL_ALL, FTAG); 1469 if (freeze_txg != 0) 1470 txg_wait_synced(spa_get_dsl(spa), freeze_txg); 1471 } 1472 1473 void 1474 zfs_panic_recover(const char *fmt, ...) 1475 { 1476 va_list adx; 1477 1478 va_start(adx, fmt); 1479 vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx); 1480 va_end(adx); 1481 } 1482 1483 /* 1484 * This is a stripped-down version of strtoull, suitable only for converting 1485 * lowercase hexadecimal numbers that don't overflow. 1486 */ 1487 uint64_t 1488 zfs_strtonum(const char *str, char **nptr) 1489 { 1490 uint64_t val = 0; 1491 char c; 1492 int digit; 1493 1494 while ((c = *str) != '\0') { 1495 if (c >= '0' && c <= '9') 1496 digit = c - '0'; 1497 else if (c >= 'a' && c <= 'f') 1498 digit = 10 + c - 'a'; 1499 else 1500 break; 1501 1502 val *= 16; 1503 val += digit; 1504 1505 str++; 1506 } 1507 1508 if (nptr) 1509 *nptr = (char *)str; 1510 1511 return (val); 1512 } 1513 1514 /* 1515 * ========================================================================== 1516 * Accessor functions 1517 * ========================================================================== 1518 */ 1519 1520 boolean_t 1521 spa_shutting_down(spa_t *spa) 1522 { 1523 return (spa->spa_async_suspended); 1524 } 1525 1526 dsl_pool_t * 1527 spa_get_dsl(spa_t *spa) 1528 { 1529 return (spa->spa_dsl_pool); 1530 } 1531 1532 boolean_t 1533 spa_is_initializing(spa_t *spa) 1534 { 1535 return (spa->spa_is_initializing); 1536 } 1537 1538 boolean_t 1539 spa_indirect_vdevs_loaded(spa_t *spa) 1540 { 1541 return (spa->spa_indirect_vdevs_loaded); 1542 } 1543 1544 blkptr_t * 1545 spa_get_rootblkptr(spa_t *spa) 1546 { 1547 return (&spa->spa_ubsync.ub_rootbp); 1548 } 1549 1550 void 1551 spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp) 1552 { 1553 spa->spa_uberblock.ub_rootbp = *bp; 1554 } 1555 1556 void 1557 spa_altroot(spa_t *spa, char *buf, size_t buflen) 1558 { 1559 if (spa->spa_root == NULL) 1560 buf[0] = '\0'; 1561 else 1562 (void) strncpy(buf, spa->spa_root, buflen); 1563 } 1564 1565 int 1566 spa_sync_pass(spa_t *spa) 1567 { 1568 return (spa->spa_sync_pass); 1569 } 1570 1571 char * 1572 spa_name(spa_t *spa) 1573 { 1574 return (spa->spa_name); 1575 } 1576 1577 uint64_t 1578 spa_guid(spa_t *spa) 1579 { 1580 dsl_pool_t *dp = spa_get_dsl(spa); 1581 uint64_t guid; 1582 1583 /* 1584 * If we fail to parse the config during spa_load(), we can go through 1585 * the error path (which posts an ereport) and end up here with no root 1586 * vdev. We stash the original pool guid in 'spa_config_guid' to handle 1587 * this case. 1588 */ 1589 if (spa->spa_root_vdev == NULL) 1590 return (spa->spa_config_guid); 1591 1592 guid = spa->spa_last_synced_guid != 0 ? 1593 spa->spa_last_synced_guid : spa->spa_root_vdev->vdev_guid; 1594 1595 /* 1596 * Return the most recently synced out guid unless we're 1597 * in syncing context. 1598 */ 1599 if (dp && dsl_pool_sync_context(dp)) 1600 return (spa->spa_root_vdev->vdev_guid); 1601 else 1602 return (guid); 1603 } 1604 1605 uint64_t 1606 spa_load_guid(spa_t *spa) 1607 { 1608 /* 1609 * This is a GUID that exists solely as a reference for the 1610 * purposes of the arc. It is generated at load time, and 1611 * is never written to persistent storage. 1612 */ 1613 return (spa->spa_load_guid); 1614 } 1615 1616 uint64_t 1617 spa_last_synced_txg(spa_t *spa) 1618 { 1619 return (spa->spa_ubsync.ub_txg); 1620 } 1621 1622 uint64_t 1623 spa_first_txg(spa_t *spa) 1624 { 1625 return (spa->spa_first_txg); 1626 } 1627 1628 uint64_t 1629 spa_syncing_txg(spa_t *spa) 1630 { 1631 return (spa->spa_syncing_txg); 1632 } 1633 1634 /* 1635 * Return the last txg where data can be dirtied. The final txgs 1636 * will be used to just clear out any deferred frees that remain. 1637 */ 1638 uint64_t 1639 spa_final_dirty_txg(spa_t *spa) 1640 { 1641 return (spa->spa_final_txg - TXG_DEFER_SIZE); 1642 } 1643 1644 pool_state_t 1645 spa_state(spa_t *spa) 1646 { 1647 return (spa->spa_state); 1648 } 1649 1650 spa_load_state_t 1651 spa_load_state(spa_t *spa) 1652 { 1653 return (spa->spa_load_state); 1654 } 1655 1656 uint64_t 1657 spa_freeze_txg(spa_t *spa) 1658 { 1659 return (spa->spa_freeze_txg); 1660 } 1661 1662 /* ARGSUSED */ 1663 uint64_t 1664 spa_get_worst_case_asize(spa_t *spa, uint64_t lsize) 1665 { 1666 return (lsize * spa_asize_inflation); 1667 } 1668 1669 /* 1670 * Return the amount of slop space in bytes. It is 1/32 of the pool (3.2%), 1671 * or at least 128MB, unless that would cause it to be more than half the 1672 * pool size. 1673 * 1674 * See the comment above spa_slop_shift for details. 1675 */ 1676 uint64_t 1677 spa_get_slop_space(spa_t *spa) 1678 { 1679 uint64_t space = spa_get_dspace(spa); 1680 return (MAX(space >> spa_slop_shift, MIN(space >> 1, spa_min_slop))); 1681 } 1682 1683 uint64_t 1684 spa_get_dspace(spa_t *spa) 1685 { 1686 return (spa->spa_dspace); 1687 } 1688 1689 void 1690 spa_update_dspace(spa_t *spa) 1691 { 1692 spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) + 1693 ddt_get_dedup_dspace(spa); 1694 if (spa->spa_vdev_removal != NULL) { 1695 /* 1696 * We can't allocate from the removing device, so 1697 * subtract its size. This prevents the DMU/DSL from 1698 * filling up the (now smaller) pool while we are in the 1699 * middle of removing the device. 1700 * 1701 * Note that the DMU/DSL doesn't actually know or care 1702 * how much space is allocated (it does its own tracking 1703 * of how much space has been logically used). So it 1704 * doesn't matter that the data we are moving may be 1705 * allocated twice (on the old device and the new 1706 * device). 1707 */ 1708 vdev_t *vd = spa->spa_vdev_removal->svr_vdev; 1709 spa->spa_dspace -= spa_deflate(spa) ? 1710 vd->vdev_stat.vs_dspace : vd->vdev_stat.vs_space; 1711 } 1712 } 1713 1714 /* 1715 * Return the failure mode that has been set to this pool. The default 1716 * behavior will be to block all I/Os when a complete failure occurs. 1717 */ 1718 uint8_t 1719 spa_get_failmode(spa_t *spa) 1720 { 1721 return (spa->spa_failmode); 1722 } 1723 1724 boolean_t 1725 spa_suspended(spa_t *spa) 1726 { 1727 return (spa->spa_suspended); 1728 } 1729 1730 uint64_t 1731 spa_version(spa_t *spa) 1732 { 1733 return (spa->spa_ubsync.ub_version); 1734 } 1735 1736 boolean_t 1737 spa_deflate(spa_t *spa) 1738 { 1739 return (spa->spa_deflate); 1740 } 1741 1742 metaslab_class_t * 1743 spa_normal_class(spa_t *spa) 1744 { 1745 return (spa->spa_normal_class); 1746 } 1747 1748 metaslab_class_t * 1749 spa_log_class(spa_t *spa) 1750 { 1751 return (spa->spa_log_class); 1752 } 1753 1754 void 1755 spa_evicting_os_register(spa_t *spa, objset_t *os) 1756 { 1757 mutex_enter(&spa->spa_evicting_os_lock); 1758 list_insert_head(&spa->spa_evicting_os_list, os); 1759 mutex_exit(&spa->spa_evicting_os_lock); 1760 } 1761 1762 void 1763 spa_evicting_os_deregister(spa_t *spa, objset_t *os) 1764 { 1765 mutex_enter(&spa->spa_evicting_os_lock); 1766 list_remove(&spa->spa_evicting_os_list, os); 1767 cv_broadcast(&spa->spa_evicting_os_cv); 1768 mutex_exit(&spa->spa_evicting_os_lock); 1769 } 1770 1771 void 1772 spa_evicting_os_wait(spa_t *spa) 1773 { 1774 mutex_enter(&spa->spa_evicting_os_lock); 1775 while (!list_is_empty(&spa->spa_evicting_os_list)) 1776 cv_wait(&spa->spa_evicting_os_cv, &spa->spa_evicting_os_lock); 1777 mutex_exit(&spa->spa_evicting_os_lock); 1778 1779 dmu_buf_user_evict_wait(); 1780 } 1781 1782 int 1783 spa_max_replication(spa_t *spa) 1784 { 1785 /* 1786 * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to 1787 * handle BPs with more than one DVA allocated. Set our max 1788 * replication level accordingly. 1789 */ 1790 if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS) 1791 return (1); 1792 return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override)); 1793 } 1794 1795 int 1796 spa_prev_software_version(spa_t *spa) 1797 { 1798 return (spa->spa_prev_software_version); 1799 } 1800 1801 uint64_t 1802 spa_deadman_synctime(spa_t *spa) 1803 { 1804 return (spa->spa_deadman_synctime); 1805 } 1806 1807 uint64_t 1808 dva_get_dsize_sync(spa_t *spa, const dva_t *dva) 1809 { 1810 uint64_t asize = DVA_GET_ASIZE(dva); 1811 uint64_t dsize = asize; 1812 1813 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1814 1815 if (asize != 0 && spa->spa_deflate) { 1816 vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva)); 1817 dsize = (asize >> SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio; 1818 } 1819 1820 return (dsize); 1821 } 1822 1823 uint64_t 1824 bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp) 1825 { 1826 uint64_t dsize = 0; 1827 1828 for (int d = 0; d < BP_GET_NDVAS(bp); d++) 1829 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]); 1830 1831 return (dsize); 1832 } 1833 1834 uint64_t 1835 bp_get_dsize(spa_t *spa, const blkptr_t *bp) 1836 { 1837 uint64_t dsize = 0; 1838 1839 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 1840 1841 for (int d = 0; d < BP_GET_NDVAS(bp); d++) 1842 dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]); 1843 1844 spa_config_exit(spa, SCL_VDEV, FTAG); 1845 1846 return (dsize); 1847 } 1848 1849 /* 1850 * ========================================================================== 1851 * Initialization and Termination 1852 * ========================================================================== 1853 */ 1854 1855 static int 1856 spa_name_compare(const void *a1, const void *a2) 1857 { 1858 const spa_t *s1 = a1; 1859 const spa_t *s2 = a2; 1860 int s; 1861 1862 s = strcmp(s1->spa_name, s2->spa_name); 1863 if (s > 0) 1864 return (1); 1865 if (s < 0) 1866 return (-1); 1867 return (0); 1868 } 1869 1870 int 1871 spa_busy(void) 1872 { 1873 return (spa_active_count); 1874 } 1875 1876 void 1877 spa_boot_init() 1878 { 1879 spa_config_load(); 1880 } 1881 1882 void 1883 spa_init(int mode) 1884 { 1885 mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL); 1886 mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL); 1887 mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL); 1888 cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL); 1889 1890 avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t), 1891 offsetof(spa_t, spa_avl)); 1892 1893 avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t), 1894 offsetof(spa_aux_t, aux_avl)); 1895 1896 avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t), 1897 offsetof(spa_aux_t, aux_avl)); 1898 1899 spa_mode_global = mode; 1900 1901 #ifdef _KERNEL 1902 spa_arch_init(); 1903 #else 1904 if (spa_mode_global != FREAD && dprintf_find_string("watch")) { 1905 arc_procfd = open("/proc/self/ctl", O_WRONLY); 1906 if (arc_procfd == -1) { 1907 perror("could not enable watchpoints: " 1908 "opening /proc/self/ctl failed: "); 1909 } else { 1910 arc_watch = B_TRUE; 1911 } 1912 } 1913 #endif 1914 1915 refcount_init(); 1916 unique_init(); 1917 range_tree_init(); 1918 metaslab_alloc_trace_init(); 1919 zio_init(); 1920 dmu_init(); 1921 zil_init(); 1922 vdev_cache_stat_init(); 1923 zfs_prop_init(); 1924 zpool_prop_init(); 1925 zpool_feature_init(); 1926 spa_config_load(); 1927 l2arc_start(); 1928 } 1929 1930 void 1931 spa_fini(void) 1932 { 1933 l2arc_stop(); 1934 1935 spa_evict_all(); 1936 1937 vdev_cache_stat_fini(); 1938 zil_fini(); 1939 dmu_fini(); 1940 zio_fini(); 1941 metaslab_alloc_trace_fini(); 1942 range_tree_fini(); 1943 unique_fini(); 1944 refcount_fini(); 1945 1946 avl_destroy(&spa_namespace_avl); 1947 avl_destroy(&spa_spare_avl); 1948 avl_destroy(&spa_l2cache_avl); 1949 1950 cv_destroy(&spa_namespace_cv); 1951 mutex_destroy(&spa_namespace_lock); 1952 mutex_destroy(&spa_spare_lock); 1953 mutex_destroy(&spa_l2cache_lock); 1954 } 1955 1956 /* 1957 * Return whether this pool has slogs. No locking needed. 1958 * It's not a problem if the wrong answer is returned as it's only for 1959 * performance and not correctness 1960 */ 1961 boolean_t 1962 spa_has_slogs(spa_t *spa) 1963 { 1964 return (spa->spa_log_class->mc_rotor != NULL); 1965 } 1966 1967 spa_log_state_t 1968 spa_get_log_state(spa_t *spa) 1969 { 1970 return (spa->spa_log_state); 1971 } 1972 1973 void 1974 spa_set_log_state(spa_t *spa, spa_log_state_t state) 1975 { 1976 spa->spa_log_state = state; 1977 } 1978 1979 boolean_t 1980 spa_is_root(spa_t *spa) 1981 { 1982 return (spa->spa_is_root); 1983 } 1984 1985 boolean_t 1986 spa_writeable(spa_t *spa) 1987 { 1988 return (!!(spa->spa_mode & FWRITE)); 1989 } 1990 1991 /* 1992 * Returns true if there is a pending sync task in any of the current 1993 * syncing txg, the current quiescing txg, or the current open txg. 1994 */ 1995 boolean_t 1996 spa_has_pending_synctask(spa_t *spa) 1997 { 1998 return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks)); 1999 } 2000 2001 int 2002 spa_mode(spa_t *spa) 2003 { 2004 return (spa->spa_mode); 2005 } 2006 2007 uint64_t 2008 spa_bootfs(spa_t *spa) 2009 { 2010 return (spa->spa_bootfs); 2011 } 2012 2013 uint64_t 2014 spa_delegation(spa_t *spa) 2015 { 2016 return (spa->spa_delegation); 2017 } 2018 2019 objset_t * 2020 spa_meta_objset(spa_t *spa) 2021 { 2022 return (spa->spa_meta_objset); 2023 } 2024 2025 enum zio_checksum 2026 spa_dedup_checksum(spa_t *spa) 2027 { 2028 return (spa->spa_dedup_checksum); 2029 } 2030 2031 /* 2032 * Reset pool scan stat per scan pass (or reboot). 2033 */ 2034 void 2035 spa_scan_stat_init(spa_t *spa) 2036 { 2037 /* data not stored on disk */ 2038 spa->spa_scan_pass_start = gethrestime_sec(); 2039 if (dsl_scan_is_paused_scrub(spa->spa_dsl_pool->dp_scan)) 2040 spa->spa_scan_pass_scrub_pause = spa->spa_scan_pass_start; 2041 else 2042 spa->spa_scan_pass_scrub_pause = 0; 2043 spa->spa_scan_pass_scrub_spent_paused = 0; 2044 spa->spa_scan_pass_exam = 0; 2045 vdev_scan_stat_init(spa->spa_root_vdev); 2046 } 2047 2048 /* 2049 * Get scan stats for zpool status reports 2050 */ 2051 int 2052 spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps) 2053 { 2054 dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL; 2055 2056 if (scn == NULL || scn->scn_phys.scn_func == POOL_SCAN_NONE) 2057 return (SET_ERROR(ENOENT)); 2058 bzero(ps, sizeof (pool_scan_stat_t)); 2059 2060 /* data stored on disk */ 2061 ps->pss_func = scn->scn_phys.scn_func; 2062 ps->pss_start_time = scn->scn_phys.scn_start_time; 2063 ps->pss_end_time = scn->scn_phys.scn_end_time; 2064 ps->pss_to_examine = scn->scn_phys.scn_to_examine; 2065 ps->pss_examined = scn->scn_phys.scn_examined; 2066 ps->pss_to_process = scn->scn_phys.scn_to_process; 2067 ps->pss_processed = scn->scn_phys.scn_processed; 2068 ps->pss_errors = scn->scn_phys.scn_errors; 2069 ps->pss_state = scn->scn_phys.scn_state; 2070 2071 /* data not stored on disk */ 2072 ps->pss_pass_start = spa->spa_scan_pass_start; 2073 ps->pss_pass_exam = spa->spa_scan_pass_exam; 2074 ps->pss_pass_scrub_pause = spa->spa_scan_pass_scrub_pause; 2075 ps->pss_pass_scrub_spent_paused = spa->spa_scan_pass_scrub_spent_paused; 2076 2077 return (0); 2078 } 2079 2080 boolean_t 2081 spa_debug_enabled(spa_t *spa) 2082 { 2083 return (spa->spa_debug); 2084 } 2085 2086 int 2087 spa_maxblocksize(spa_t *spa) 2088 { 2089 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) 2090 return (SPA_MAXBLOCKSIZE); 2091 else 2092 return (SPA_OLD_MAXBLOCKSIZE); 2093 } 2094 2095 /* 2096 * Returns the txg that the last device removal completed. No indirect mappings 2097 * have been added since this txg. 2098 */ 2099 uint64_t 2100 spa_get_last_removal_txg(spa_t *spa) 2101 { 2102 uint64_t vdevid; 2103 uint64_t ret = -1ULL; 2104 2105 spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 2106 /* 2107 * sr_prev_indirect_vdev is only modified while holding all the 2108 * config locks, so it is sufficient to hold SCL_VDEV as reader when 2109 * examining it. 2110 */ 2111 vdevid = spa->spa_removing_phys.sr_prev_indirect_vdev; 2112 2113 while (vdevid != -1ULL) { 2114 vdev_t *vd = vdev_lookup_top(spa, vdevid); 2115 vdev_indirect_births_t *vib = vd->vdev_indirect_births; 2116 2117 ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops); 2118 2119 /* 2120 * If the removal did not remap any data, we don't care. 2121 */ 2122 if (vdev_indirect_births_count(vib) != 0) { 2123 ret = vdev_indirect_births_last_entry_txg(vib); 2124 break; 2125 } 2126 2127 vdevid = vd->vdev_indirect_config.vic_prev_indirect_vdev; 2128 } 2129 spa_config_exit(spa, SCL_VDEV, FTAG); 2130 2131 IMPLY(ret != -1ULL, 2132 spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 2133 2134 return (ret); 2135 } 2136