1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 2239c23413Seschrock * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/zfs_context.h> 29fa9e4066Sahrens #include <sys/spa_impl.h> 30fa9e4066Sahrens #include <sys/zio.h> 31fa9e4066Sahrens #include <sys/zio_checksum.h> 32fa9e4066Sahrens #include <sys/zio_compress.h> 33fa9e4066Sahrens #include <sys/dmu.h> 34fa9e4066Sahrens #include <sys/dmu_tx.h> 35fa9e4066Sahrens #include <sys/zap.h> 36fa9e4066Sahrens #include <sys/zil.h> 37fa9e4066Sahrens #include <sys/vdev_impl.h> 38fa9e4066Sahrens #include <sys/metaslab.h> 39fa9e4066Sahrens #include <sys/uberblock_impl.h> 40fa9e4066Sahrens #include <sys/txg.h> 41fa9e4066Sahrens #include <sys/avl.h> 42fa9e4066Sahrens #include <sys/unique.h> 43fa9e4066Sahrens #include <sys/dsl_pool.h> 44fa9e4066Sahrens #include <sys/dsl_dir.h> 45fa9e4066Sahrens #include <sys/dsl_prop.h> 46fa9e4066Sahrens #include <sys/fs/zfs.h> 476ce0521aSperrin #include <sys/metaslab_impl.h> 4891ebeef5Sahrens #include "zfs_prop.h" 49fa9e4066Sahrens 50fa9e4066Sahrens /* 51fa9e4066Sahrens * SPA locking 52fa9e4066Sahrens * 53fa9e4066Sahrens * There are four basic locks for managing spa_t structures: 54fa9e4066Sahrens * 55fa9e4066Sahrens * spa_namespace_lock (global mutex) 56fa9e4066Sahrens * 5744cd46caSbillm * This lock must be acquired to do any of the following: 58fa9e4066Sahrens * 5944cd46caSbillm * - Lookup a spa_t by name 6044cd46caSbillm * - Add or remove a spa_t from the namespace 6144cd46caSbillm * - Increase spa_refcount from non-zero 6244cd46caSbillm * - Check if spa_refcount is zero 6344cd46caSbillm * - Rename a spa_t 64ea8dc4b6Seschrock * - add/remove/attach/detach devices 6544cd46caSbillm * - Held for the duration of create/destroy/import/export 66fa9e4066Sahrens * 6744cd46caSbillm * It does not need to handle recursion. A create or destroy may 6844cd46caSbillm * reference objects (files or zvols) in other pools, but by 6944cd46caSbillm * definition they must have an existing reference, and will never need 7044cd46caSbillm * to lookup a spa_t by name. 71fa9e4066Sahrens * 72fa9e4066Sahrens * spa_refcount (per-spa refcount_t protected by mutex) 73fa9e4066Sahrens * 7444cd46caSbillm * This reference count keep track of any active users of the spa_t. The 7544cd46caSbillm * spa_t cannot be destroyed or freed while this is non-zero. Internally, 7644cd46caSbillm * the refcount is never really 'zero' - opening a pool implicitly keeps 7744cd46caSbillm * some references in the DMU. Internally we check against SPA_MINREF, but 7844cd46caSbillm * present the image of a zero/non-zero value to consumers. 79fa9e4066Sahrens * 8091ebeef5Sahrens * spa_config_lock (per-spa read-priority rwlock) 81fa9e4066Sahrens * 8291ebeef5Sahrens * This protects the spa_t from config changes, and must be held in 8391ebeef5Sahrens * the following circumstances: 84fa9e4066Sahrens * 8544cd46caSbillm * - RW_READER to perform I/O to the spa 8644cd46caSbillm * - RW_WRITER to change the vdev config 87fa9e4066Sahrens * 88fa9e4066Sahrens * spa_config_cache_lock (per-spa mutex) 89fa9e4066Sahrens * 9044cd46caSbillm * This mutex prevents the spa_config nvlist from being updated. No 91fa9e4066Sahrens * other locks are required to obtain this lock, although implicitly you 92fa9e4066Sahrens * must have the namespace lock or non-zero refcount to have any kind 93fa9e4066Sahrens * of spa_t pointer at all. 94fa9e4066Sahrens * 95fa9e4066Sahrens * The locking order is fairly straightforward: 96fa9e4066Sahrens * 9744cd46caSbillm * spa_namespace_lock -> spa_refcount 98fa9e4066Sahrens * 9944cd46caSbillm * The namespace lock must be acquired to increase the refcount from 0 10044cd46caSbillm * or to check if it is zero. 101fa9e4066Sahrens * 10244cd46caSbillm * spa_refcount -> spa_config_lock 103fa9e4066Sahrens * 10444cd46caSbillm * There must be at least one valid reference on the spa_t to acquire 10544cd46caSbillm * the config lock. 106fa9e4066Sahrens * 10744cd46caSbillm * spa_namespace_lock -> spa_config_lock 108fa9e4066Sahrens * 10944cd46caSbillm * The namespace lock must always be taken before the config lock. 110fa9e4066Sahrens * 111fa9e4066Sahrens * 112fa9e4066Sahrens * The spa_namespace_lock and spa_config_cache_lock can be acquired directly and 113fa9e4066Sahrens * are globally visible. 114fa9e4066Sahrens * 115fa9e4066Sahrens * The namespace is manipulated using the following functions, all which require 116fa9e4066Sahrens * the spa_namespace_lock to be held. 117fa9e4066Sahrens * 11844cd46caSbillm * spa_lookup() Lookup a spa_t by name. 119fa9e4066Sahrens * 12044cd46caSbillm * spa_add() Create a new spa_t in the namespace. 121fa9e4066Sahrens * 12244cd46caSbillm * spa_remove() Remove a spa_t from the namespace. This also 12344cd46caSbillm * frees up any memory associated with the spa_t. 124fa9e4066Sahrens * 12544cd46caSbillm * spa_next() Returns the next spa_t in the system, or the 12644cd46caSbillm * first if NULL is passed. 127fa9e4066Sahrens * 12844cd46caSbillm * spa_evict_all() Shutdown and remove all spa_t structures in 12944cd46caSbillm * the system. 130fa9e4066Sahrens * 131ea8dc4b6Seschrock * spa_guid_exists() Determine whether a pool/device guid exists. 132fa9e4066Sahrens * 133fa9e4066Sahrens * The spa_refcount is manipulated using the following functions: 134fa9e4066Sahrens * 13544cd46caSbillm * spa_open_ref() Adds a reference to the given spa_t. Must be 13644cd46caSbillm * called with spa_namespace_lock held if the 13744cd46caSbillm * refcount is currently zero. 138fa9e4066Sahrens * 13944cd46caSbillm * spa_close() Remove a reference from the spa_t. This will 14044cd46caSbillm * not free the spa_t or remove it from the 14144cd46caSbillm * namespace. No locking is required. 142fa9e4066Sahrens * 14344cd46caSbillm * spa_refcount_zero() Returns true if the refcount is currently 14444cd46caSbillm * zero. Must be called with spa_namespace_lock 14544cd46caSbillm * held. 146fa9e4066Sahrens * 147fa9e4066Sahrens * The spa_config_lock is manipulated using the following functions: 148fa9e4066Sahrens * 14944cd46caSbillm * spa_config_enter() Acquire the config lock as RW_READER or 15044cd46caSbillm * RW_WRITER. At least one reference on the spa_t 15144cd46caSbillm * must exist. 152fa9e4066Sahrens * 15344cd46caSbillm * spa_config_exit() Release the config lock. 154fa9e4066Sahrens * 15544cd46caSbillm * spa_config_held() Returns true if the config lock is currently 15644cd46caSbillm * held in the given state. 157fa9e4066Sahrens * 158ea8dc4b6Seschrock * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit(). 159fa9e4066Sahrens * 16044cd46caSbillm * spa_vdev_enter() Acquire the namespace lock and the config lock 161ea8dc4b6Seschrock * for writing. 162fa9e4066Sahrens * 16344cd46caSbillm * spa_vdev_exit() Release the config lock, wait for all I/O 16444cd46caSbillm * to complete, sync the updated configs to the 165ea8dc4b6Seschrock * cache, and release the namespace lock. 166fa9e4066Sahrens * 167fa9e4066Sahrens * The spa_name() function also requires either the spa_namespace_lock 168fa9e4066Sahrens * or the spa_config_lock, as both are needed to do a rename. spa_rename() is 169fa9e4066Sahrens * also implemented within this file since is requires manipulation of the 170fa9e4066Sahrens * namespace. 171fa9e4066Sahrens */ 172fa9e4066Sahrens 173fa9e4066Sahrens static avl_tree_t spa_namespace_avl; 174fa9e4066Sahrens kmutex_t spa_namespace_lock; 175fa9e4066Sahrens static kcondvar_t spa_namespace_cv; 1760373e76bSbonwick static int spa_active_count; 177416e0cd8Sek int spa_max_replication_override = SPA_DVAS_PER_BP; 178fa9e4066Sahrens 17999653d4eSeschrock static kmutex_t spa_spare_lock; 18039c23413Seschrock static avl_tree_t spa_spare_avl; 18199653d4eSeschrock 182fa9e4066Sahrens kmem_cache_t *spa_buffer_pool; 183fa9e4066Sahrens int spa_mode; 184fa9e4066Sahrens 185fa9e4066Sahrens #ifdef ZFS_DEBUG 18640feaa91Sahrens /* Everything except dprintf is on by default in debug builds */ 18740feaa91Sahrens int zfs_flags = ~ZFS_DEBUG_DPRINTF; 188fa9e4066Sahrens #else 189fa9e4066Sahrens int zfs_flags = 0; 190fa9e4066Sahrens #endif 191fa9e4066Sahrens 1920125049cSahrens /* 1930125049cSahrens * zfs_recover can be set to nonzero to attempt to recover from 1940125049cSahrens * otherwise-fatal errors, typically caused by on-disk corruption. When 1950125049cSahrens * set, calls to zfs_panic_recover() will turn into warning messages. 1960125049cSahrens */ 1970125049cSahrens int zfs_recover = 0; 1980125049cSahrens 199fa9e4066Sahrens #define SPA_MINREF 5 /* spa_refcnt for an open-but-idle pool */ 200fa9e4066Sahrens 201fa9e4066Sahrens /* 202fa9e4066Sahrens * ========================================================================== 203fa9e4066Sahrens * SPA namespace functions 204fa9e4066Sahrens * ========================================================================== 205fa9e4066Sahrens */ 206fa9e4066Sahrens 207fa9e4066Sahrens /* 208fa9e4066Sahrens * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held. 209fa9e4066Sahrens * Returns NULL if no matching spa_t is found. 210fa9e4066Sahrens */ 211fa9e4066Sahrens spa_t * 212fa9e4066Sahrens spa_lookup(const char *name) 213fa9e4066Sahrens { 214fa9e4066Sahrens spa_t search, *spa; 215fa9e4066Sahrens avl_index_t where; 21640feaa91Sahrens char c; 21740feaa91Sahrens char *cp; 218fa9e4066Sahrens 219fa9e4066Sahrens ASSERT(MUTEX_HELD(&spa_namespace_lock)); 220fa9e4066Sahrens 22140feaa91Sahrens /* 22240feaa91Sahrens * If it's a full dataset name, figure out the pool name and 22340feaa91Sahrens * just use that. 22440feaa91Sahrens */ 22540feaa91Sahrens cp = strpbrk(name, "/@"); 22640feaa91Sahrens if (cp) { 22740feaa91Sahrens c = *cp; 22840feaa91Sahrens *cp = '\0'; 22940feaa91Sahrens } 23040feaa91Sahrens 231fa9e4066Sahrens search.spa_name = (char *)name; 232fa9e4066Sahrens spa = avl_find(&spa_namespace_avl, &search, &where); 233fa9e4066Sahrens 23440feaa91Sahrens if (cp) 23540feaa91Sahrens *cp = c; 23640feaa91Sahrens 237fa9e4066Sahrens return (spa); 238fa9e4066Sahrens } 239fa9e4066Sahrens 240fa9e4066Sahrens /* 241fa9e4066Sahrens * Create an uninitialized spa_t with the given name. Requires 242fa9e4066Sahrens * spa_namespace_lock. The caller must ensure that the spa_t doesn't already 243fa9e4066Sahrens * exist by calling spa_lookup() first. 244fa9e4066Sahrens */ 245fa9e4066Sahrens spa_t * 2460373e76bSbonwick spa_add(const char *name, const char *altroot) 247fa9e4066Sahrens { 248fa9e4066Sahrens spa_t *spa; 249fa9e4066Sahrens 250fa9e4066Sahrens ASSERT(MUTEX_HELD(&spa_namespace_lock)); 251fa9e4066Sahrens 252fa9e4066Sahrens spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP); 253fa9e4066Sahrens 254c25056deSgw rw_init(&spa->spa_traverse_lock, NULL, RW_DEFAULT, NULL); 255c25056deSgw 256c25056deSgw mutex_init(&spa->spa_uberblock_lock, NULL, MUTEX_DEFAULT, NULL); 257c25056deSgw mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL); 258c25056deSgw mutex_init(&spa->spa_config_cache_lock, NULL, MUTEX_DEFAULT, NULL); 259c25056deSgw mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL); 260c25056deSgw mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL); 261c25056deSgw mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL); 262c25056deSgw mutex_init(&spa->spa_sync_bplist.bpl_lock, NULL, MUTEX_DEFAULT, NULL); 263c25056deSgw mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL); 264c25056deSgw mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL); 265c25056deSgw 266c25056deSgw cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL); 267c25056deSgw cv_init(&spa->spa_scrub_cv, NULL, CV_DEFAULT, NULL); 268c25056deSgw cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL); 269c25056deSgw 270fa9e4066Sahrens spa->spa_name = spa_strdup(name); 271fa9e4066Sahrens spa->spa_state = POOL_STATE_UNINITIALIZED; 272fa9e4066Sahrens spa->spa_freeze_txg = UINT64_MAX; 2730373e76bSbonwick spa->spa_final_txg = UINT64_MAX; 274fa9e4066Sahrens 275fa9e4066Sahrens refcount_create(&spa->spa_refcount); 27691ebeef5Sahrens rprw_init(&spa->spa_config_lock); 277fa9e4066Sahrens 278fa9e4066Sahrens avl_add(&spa_namespace_avl, spa); 279fa9e4066Sahrens 280*0a4e9518Sgw mutex_init(&spa->spa_zio_lock, NULL, MUTEX_DEFAULT, NULL); 281*0a4e9518Sgw 2820373e76bSbonwick /* 2830373e76bSbonwick * Set the alternate root, if there is one. 2840373e76bSbonwick */ 2850373e76bSbonwick if (altroot) { 2860373e76bSbonwick spa->spa_root = spa_strdup(altroot); 2870373e76bSbonwick spa_active_count++; 2880373e76bSbonwick } 2890373e76bSbonwick 290fa9e4066Sahrens return (spa); 291fa9e4066Sahrens } 292fa9e4066Sahrens 293fa9e4066Sahrens /* 294fa9e4066Sahrens * Removes a spa_t from the namespace, freeing up any memory used. Requires 295fa9e4066Sahrens * spa_namespace_lock. This is called only after the spa_t has been closed and 296fa9e4066Sahrens * deactivated. 297fa9e4066Sahrens */ 298fa9e4066Sahrens void 299fa9e4066Sahrens spa_remove(spa_t *spa) 300fa9e4066Sahrens { 301fa9e4066Sahrens ASSERT(MUTEX_HELD(&spa_namespace_lock)); 302fa9e4066Sahrens ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 303fa9e4066Sahrens ASSERT(spa->spa_scrub_thread == NULL); 304fa9e4066Sahrens 305fa9e4066Sahrens avl_remove(&spa_namespace_avl, spa); 306fa9e4066Sahrens cv_broadcast(&spa_namespace_cv); 307fa9e4066Sahrens 3080373e76bSbonwick if (spa->spa_root) { 309fa9e4066Sahrens spa_strfree(spa->spa_root); 3100373e76bSbonwick spa_active_count--; 3110373e76bSbonwick } 312fa9e4066Sahrens 313fa9e4066Sahrens if (spa->spa_name) 314fa9e4066Sahrens spa_strfree(spa->spa_name); 315fa9e4066Sahrens 316fa9e4066Sahrens spa_config_set(spa, NULL); 317fa9e4066Sahrens 318fa9e4066Sahrens refcount_destroy(&spa->spa_refcount); 31991ebeef5Sahrens 32091ebeef5Sahrens rprw_destroy(&spa->spa_config_lock); 321fa9e4066Sahrens 322c25056deSgw rw_destroy(&spa->spa_traverse_lock); 323c25056deSgw 324c25056deSgw cv_destroy(&spa->spa_async_cv); 325c25056deSgw cv_destroy(&spa->spa_scrub_cv); 326c25056deSgw cv_destroy(&spa->spa_scrub_io_cv); 327c25056deSgw 328c25056deSgw mutex_destroy(&spa->spa_uberblock_lock); 3295ad82045Snd mutex_destroy(&spa->spa_async_lock); 330c25056deSgw mutex_destroy(&spa->spa_config_cache_lock); 331c25056deSgw mutex_destroy(&spa->spa_scrub_lock); 332c25056deSgw mutex_destroy(&spa->spa_errlog_lock); 333c25056deSgw mutex_destroy(&spa->spa_errlist_lock); 334c25056deSgw mutex_destroy(&spa->spa_sync_bplist.bpl_lock); 33506eeb2adSek mutex_destroy(&spa->spa_history_lock); 336b1b8ab34Slling mutex_destroy(&spa->spa_props_lock); 337*0a4e9518Sgw mutex_destroy(&spa->spa_zio_lock); 3385ad82045Snd 339fa9e4066Sahrens kmem_free(spa, sizeof (spa_t)); 340fa9e4066Sahrens } 341fa9e4066Sahrens 342fa9e4066Sahrens /* 343fa9e4066Sahrens * Given a pool, return the next pool in the namespace, or NULL if there is 344fa9e4066Sahrens * none. If 'prev' is NULL, return the first pool. 345fa9e4066Sahrens */ 346fa9e4066Sahrens spa_t * 347fa9e4066Sahrens spa_next(spa_t *prev) 348fa9e4066Sahrens { 349fa9e4066Sahrens ASSERT(MUTEX_HELD(&spa_namespace_lock)); 350fa9e4066Sahrens 351fa9e4066Sahrens if (prev) 352fa9e4066Sahrens return (AVL_NEXT(&spa_namespace_avl, prev)); 353fa9e4066Sahrens else 354fa9e4066Sahrens return (avl_first(&spa_namespace_avl)); 355fa9e4066Sahrens } 356fa9e4066Sahrens 357fa9e4066Sahrens /* 358fa9e4066Sahrens * ========================================================================== 359fa9e4066Sahrens * SPA refcount functions 360fa9e4066Sahrens * ========================================================================== 361fa9e4066Sahrens */ 362fa9e4066Sahrens 363fa9e4066Sahrens /* 364fa9e4066Sahrens * Add a reference to the given spa_t. Must have at least one reference, or 365fa9e4066Sahrens * have the namespace lock held. 366fa9e4066Sahrens */ 367fa9e4066Sahrens void 368fa9e4066Sahrens spa_open_ref(spa_t *spa, void *tag) 369fa9e4066Sahrens { 370fa9e4066Sahrens ASSERT(refcount_count(&spa->spa_refcount) > SPA_MINREF || 371fa9e4066Sahrens MUTEX_HELD(&spa_namespace_lock)); 372fa9e4066Sahrens 373fa9e4066Sahrens (void) refcount_add(&spa->spa_refcount, tag); 374fa9e4066Sahrens } 375fa9e4066Sahrens 376fa9e4066Sahrens /* 377fa9e4066Sahrens * Remove a reference to the given spa_t. Must have at least one reference, or 378fa9e4066Sahrens * have the namespace lock held. 379fa9e4066Sahrens */ 380fa9e4066Sahrens void 381fa9e4066Sahrens spa_close(spa_t *spa, void *tag) 382fa9e4066Sahrens { 383fa9e4066Sahrens ASSERT(refcount_count(&spa->spa_refcount) > SPA_MINREF || 384fa9e4066Sahrens MUTEX_HELD(&spa_namespace_lock)); 385fa9e4066Sahrens 386fa9e4066Sahrens (void) refcount_remove(&spa->spa_refcount, tag); 387fa9e4066Sahrens } 388fa9e4066Sahrens 389fa9e4066Sahrens /* 390fa9e4066Sahrens * Check to see if the spa refcount is zero. Must be called with 391fa9e4066Sahrens * spa_namespace_lock held. We really compare against SPA_MINREF, which is the 392fa9e4066Sahrens * number of references acquired when opening a pool 393fa9e4066Sahrens */ 394fa9e4066Sahrens boolean_t 395fa9e4066Sahrens spa_refcount_zero(spa_t *spa) 396fa9e4066Sahrens { 397fa9e4066Sahrens ASSERT(MUTEX_HELD(&spa_namespace_lock)); 398fa9e4066Sahrens 399fa9e4066Sahrens return (refcount_count(&spa->spa_refcount) == SPA_MINREF); 400fa9e4066Sahrens } 401fa9e4066Sahrens 40299653d4eSeschrock /* 40399653d4eSeschrock * ========================================================================== 40499653d4eSeschrock * SPA spare tracking 40599653d4eSeschrock * ========================================================================== 40699653d4eSeschrock */ 40799653d4eSeschrock 40899653d4eSeschrock /* 40939c23413Seschrock * Spares are tracked globally due to the following constraints: 41039c23413Seschrock * 41139c23413Seschrock * - A spare may be part of multiple pools. 41239c23413Seschrock * - A spare may be added to a pool even if it's actively in use within 41339c23413Seschrock * another pool. 41439c23413Seschrock * - A spare in use in any pool can only be the source of a replacement if 41539c23413Seschrock * the target is a spare in the same pool. 41639c23413Seschrock * 41739c23413Seschrock * We keep track of all spares on the system through the use of a reference 41839c23413Seschrock * counted AVL tree. When a vdev is added as a spare, or used as a replacement 41939c23413Seschrock * spare, then we bump the reference count in the AVL tree. In addition, we set 42039c23413Seschrock * the 'vdev_isspare' member to indicate that the device is a spare (active or 42139c23413Seschrock * inactive). When a spare is made active (used to replace a device in the 42239c23413Seschrock * pool), we also keep track of which pool its been made a part of. 42339c23413Seschrock * 42439c23413Seschrock * The 'spa_spare_lock' protects the AVL tree. These functions are normally 42539c23413Seschrock * called under the spa_namespace lock as part of vdev reconfiguration. The 42639c23413Seschrock * separate spare lock exists for the status query path, which does not need to 42739c23413Seschrock * be completely consistent with respect to other vdev configuration changes. 42899653d4eSeschrock */ 42939c23413Seschrock 43099653d4eSeschrock typedef struct spa_spare { 43199653d4eSeschrock uint64_t spare_guid; 43239c23413Seschrock uint64_t spare_pool; 43399653d4eSeschrock avl_node_t spare_avl; 43499653d4eSeschrock int spare_count; 43599653d4eSeschrock } spa_spare_t; 43699653d4eSeschrock 43799653d4eSeschrock static int 43899653d4eSeschrock spa_spare_compare(const void *a, const void *b) 43999653d4eSeschrock { 44099653d4eSeschrock const spa_spare_t *sa = a; 44199653d4eSeschrock const spa_spare_t *sb = b; 44299653d4eSeschrock 44399653d4eSeschrock if (sa->spare_guid < sb->spare_guid) 44499653d4eSeschrock return (-1); 44599653d4eSeschrock else if (sa->spare_guid > sb->spare_guid) 44699653d4eSeschrock return (1); 44799653d4eSeschrock else 44899653d4eSeschrock return (0); 44999653d4eSeschrock } 45099653d4eSeschrock 45199653d4eSeschrock void 45239c23413Seschrock spa_spare_add(vdev_t *vd) 45399653d4eSeschrock { 45499653d4eSeschrock avl_index_t where; 45599653d4eSeschrock spa_spare_t search; 45699653d4eSeschrock spa_spare_t *spare; 45799653d4eSeschrock 45899653d4eSeschrock mutex_enter(&spa_spare_lock); 45939c23413Seschrock ASSERT(!vd->vdev_isspare); 46099653d4eSeschrock 46139c23413Seschrock search.spare_guid = vd->vdev_guid; 46299653d4eSeschrock if ((spare = avl_find(&spa_spare_avl, &search, &where)) != NULL) { 46399653d4eSeschrock spare->spare_count++; 46499653d4eSeschrock } else { 46539c23413Seschrock spare = kmem_zalloc(sizeof (spa_spare_t), KM_SLEEP); 46639c23413Seschrock spare->spare_guid = vd->vdev_guid; 46799653d4eSeschrock spare->spare_count = 1; 46899653d4eSeschrock avl_insert(&spa_spare_avl, spare, where); 46999653d4eSeschrock } 47039c23413Seschrock vd->vdev_isspare = B_TRUE; 47199653d4eSeschrock 47299653d4eSeschrock mutex_exit(&spa_spare_lock); 47399653d4eSeschrock } 47499653d4eSeschrock 47599653d4eSeschrock void 47639c23413Seschrock spa_spare_remove(vdev_t *vd) 47799653d4eSeschrock { 47899653d4eSeschrock spa_spare_t search; 47999653d4eSeschrock spa_spare_t *spare; 48099653d4eSeschrock avl_index_t where; 48199653d4eSeschrock 48299653d4eSeschrock mutex_enter(&spa_spare_lock); 48399653d4eSeschrock 48439c23413Seschrock search.spare_guid = vd->vdev_guid; 48599653d4eSeschrock spare = avl_find(&spa_spare_avl, &search, &where); 48699653d4eSeschrock 48739c23413Seschrock ASSERT(vd->vdev_isspare); 48899653d4eSeschrock ASSERT(spare != NULL); 48999653d4eSeschrock 49099653d4eSeschrock if (--spare->spare_count == 0) { 49199653d4eSeschrock avl_remove(&spa_spare_avl, spare); 49299653d4eSeschrock kmem_free(spare, sizeof (spa_spare_t)); 49339c23413Seschrock } else if (spare->spare_pool == spa_guid(vd->vdev_spa)) { 49439c23413Seschrock spare->spare_pool = 0ULL; 49599653d4eSeschrock } 49699653d4eSeschrock 49739c23413Seschrock vd->vdev_isspare = B_FALSE; 49899653d4eSeschrock mutex_exit(&spa_spare_lock); 49999653d4eSeschrock } 50099653d4eSeschrock 50199653d4eSeschrock boolean_t 50239c23413Seschrock spa_spare_exists(uint64_t guid, uint64_t *pool) 50399653d4eSeschrock { 50439c23413Seschrock spa_spare_t search, *found; 50599653d4eSeschrock avl_index_t where; 50699653d4eSeschrock 50799653d4eSeschrock mutex_enter(&spa_spare_lock); 50899653d4eSeschrock 50999653d4eSeschrock search.spare_guid = guid; 51039c23413Seschrock found = avl_find(&spa_spare_avl, &search, &where); 51139c23413Seschrock 51239c23413Seschrock if (pool) { 51339c23413Seschrock if (found) 51439c23413Seschrock *pool = found->spare_pool; 51539c23413Seschrock else 51639c23413Seschrock *pool = 0ULL; 51739c23413Seschrock } 51899653d4eSeschrock 51999653d4eSeschrock mutex_exit(&spa_spare_lock); 52099653d4eSeschrock 52139c23413Seschrock return (found != NULL); 52239c23413Seschrock } 52339c23413Seschrock 52439c23413Seschrock void 52539c23413Seschrock spa_spare_activate(vdev_t *vd) 52639c23413Seschrock { 52739c23413Seschrock spa_spare_t search, *found; 52839c23413Seschrock avl_index_t where; 52939c23413Seschrock 53039c23413Seschrock mutex_enter(&spa_spare_lock); 53139c23413Seschrock ASSERT(vd->vdev_isspare); 53239c23413Seschrock 53339c23413Seschrock search.spare_guid = vd->vdev_guid; 53439c23413Seschrock found = avl_find(&spa_spare_avl, &search, &where); 53539c23413Seschrock ASSERT(found != NULL); 53639c23413Seschrock ASSERT(found->spare_pool == 0ULL); 53739c23413Seschrock 53839c23413Seschrock found->spare_pool = spa_guid(vd->vdev_spa); 53939c23413Seschrock mutex_exit(&spa_spare_lock); 54099653d4eSeschrock } 54199653d4eSeschrock 542fa9e4066Sahrens /* 543fa9e4066Sahrens * ========================================================================== 544fa9e4066Sahrens * SPA config locking 545fa9e4066Sahrens * ========================================================================== 546fa9e4066Sahrens */ 547fa9e4066Sahrens void 548ea8dc4b6Seschrock spa_config_enter(spa_t *spa, krw_t rw, void *tag) 549fa9e4066Sahrens { 55091ebeef5Sahrens rprw_enter(&spa->spa_config_lock, rw, tag); 551fa9e4066Sahrens } 552fa9e4066Sahrens 553fa9e4066Sahrens void 554ea8dc4b6Seschrock spa_config_exit(spa_t *spa, void *tag) 555fa9e4066Sahrens { 55691ebeef5Sahrens rprw_exit(&spa->spa_config_lock, tag); 557fa9e4066Sahrens } 558fa9e4066Sahrens 559fa9e4066Sahrens boolean_t 560fa9e4066Sahrens spa_config_held(spa_t *spa, krw_t rw) 561fa9e4066Sahrens { 56291ebeef5Sahrens return (rprw_held(&spa->spa_config_lock, rw)); 563fa9e4066Sahrens } 564fa9e4066Sahrens 565fa9e4066Sahrens /* 566fa9e4066Sahrens * ========================================================================== 567fa9e4066Sahrens * SPA vdev locking 568fa9e4066Sahrens * ========================================================================== 569fa9e4066Sahrens */ 570fa9e4066Sahrens 571fa9e4066Sahrens /* 572ea8dc4b6Seschrock * Lock the given spa_t for the purpose of adding or removing a vdev. 573ea8dc4b6Seschrock * Grabs the global spa_namespace_lock plus the spa config lock for writing. 574fa9e4066Sahrens * It returns the next transaction group for the spa_t. 575fa9e4066Sahrens */ 576fa9e4066Sahrens uint64_t 577fa9e4066Sahrens spa_vdev_enter(spa_t *spa) 578fa9e4066Sahrens { 5793d7072f8Seschrock mutex_enter(&spa_namespace_lock); 5803d7072f8Seschrock 581ea8dc4b6Seschrock /* 5823d7072f8Seschrock * Suspend scrub activity while we mess with the config. We must do 5833d7072f8Seschrock * this after acquiring the namespace lock to avoid a 3-way deadlock 5843d7072f8Seschrock * with spa_scrub_stop() and the scrub thread. 585ea8dc4b6Seschrock */ 586ea8dc4b6Seschrock spa_scrub_suspend(spa); 587fa9e4066Sahrens 588ea8dc4b6Seschrock spa_config_enter(spa, RW_WRITER, spa); 589fa9e4066Sahrens 590fa9e4066Sahrens return (spa_last_synced_txg(spa) + 1); 591fa9e4066Sahrens } 592fa9e4066Sahrens 593fa9e4066Sahrens /* 594fa9e4066Sahrens * Unlock the spa_t after adding or removing a vdev. Besides undoing the 595fa9e4066Sahrens * locking of spa_vdev_enter(), we also want make sure the transactions have 596fa9e4066Sahrens * synced to disk, and then update the global configuration cache with the new 597fa9e4066Sahrens * information. 598fa9e4066Sahrens */ 599fa9e4066Sahrens int 600fa9e4066Sahrens spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error) 601fa9e4066Sahrens { 6020e34b6a7Sbonwick int config_changed = B_FALSE; 603ea8dc4b6Seschrock 6040373e76bSbonwick ASSERT(txg > spa_last_synced_txg(spa)); 6050e34b6a7Sbonwick 6060e34b6a7Sbonwick /* 6070e34b6a7Sbonwick * Reassess the DTLs. 6080e34b6a7Sbonwick */ 6090373e76bSbonwick vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE); 6100e34b6a7Sbonwick 6110e34b6a7Sbonwick /* 6120373e76bSbonwick * If the config changed, notify the scrub thread that it must restart. 6130e34b6a7Sbonwick */ 6140e34b6a7Sbonwick if (error == 0 && !list_is_empty(&spa->spa_dirty_list)) { 6150e34b6a7Sbonwick config_changed = B_TRUE; 6160373e76bSbonwick spa_scrub_restart(spa, txg); 6170e34b6a7Sbonwick } 618ea8dc4b6Seschrock 619ea8dc4b6Seschrock spa_config_exit(spa, spa); 620fa9e4066Sahrens 621ea8dc4b6Seschrock /* 6225dabedeeSbonwick * Allow scrubbing to resume. 623ea8dc4b6Seschrock */ 624ea8dc4b6Seschrock spa_scrub_resume(spa); 625fa9e4066Sahrens 626fa9e4066Sahrens /* 627fa9e4066Sahrens * Note: this txg_wait_synced() is important because it ensures 628fa9e4066Sahrens * that there won't be more than one config change per txg. 629fa9e4066Sahrens * This allows us to use the txg as the generation number. 630fa9e4066Sahrens */ 631fa9e4066Sahrens if (error == 0) 632fa9e4066Sahrens txg_wait_synced(spa->spa_dsl_pool, txg); 633fa9e4066Sahrens 634fa9e4066Sahrens if (vd != NULL) { 635fa9e4066Sahrens ASSERT(!vd->vdev_detached || vd->vdev_dtl.smo_object == 0); 636fa9e4066Sahrens vdev_free(vd); 637fa9e4066Sahrens } 638fa9e4066Sahrens 639fa9e4066Sahrens /* 6400e34b6a7Sbonwick * If the config changed, update the config cache. 641fa9e4066Sahrens */ 6420e34b6a7Sbonwick if (config_changed) 643fa9e4066Sahrens spa_config_sync(); 644ea8dc4b6Seschrock 645ea8dc4b6Seschrock mutex_exit(&spa_namespace_lock); 646fa9e4066Sahrens 647fa9e4066Sahrens return (error); 648fa9e4066Sahrens } 649fa9e4066Sahrens 650fa9e4066Sahrens /* 651fa9e4066Sahrens * ========================================================================== 652fa9e4066Sahrens * Miscellaneous functions 653fa9e4066Sahrens * ========================================================================== 654fa9e4066Sahrens */ 655fa9e4066Sahrens 656fa9e4066Sahrens /* 657fa9e4066Sahrens * Rename a spa_t. 658fa9e4066Sahrens */ 659fa9e4066Sahrens int 660fa9e4066Sahrens spa_rename(const char *name, const char *newname) 661fa9e4066Sahrens { 662fa9e4066Sahrens spa_t *spa; 663fa9e4066Sahrens int err; 664fa9e4066Sahrens 665fa9e4066Sahrens /* 666fa9e4066Sahrens * Lookup the spa_t and grab the config lock for writing. We need to 667fa9e4066Sahrens * actually open the pool so that we can sync out the necessary labels. 668fa9e4066Sahrens * It's OK to call spa_open() with the namespace lock held because we 669ea8dc4b6Seschrock * allow recursive calls for other reasons. 670fa9e4066Sahrens */ 671fa9e4066Sahrens mutex_enter(&spa_namespace_lock); 672fa9e4066Sahrens if ((err = spa_open(name, &spa, FTAG)) != 0) { 673fa9e4066Sahrens mutex_exit(&spa_namespace_lock); 674fa9e4066Sahrens return (err); 675fa9e4066Sahrens } 676fa9e4066Sahrens 677ea8dc4b6Seschrock spa_config_enter(spa, RW_WRITER, FTAG); 678fa9e4066Sahrens 679fa9e4066Sahrens avl_remove(&spa_namespace_avl, spa); 680fa9e4066Sahrens spa_strfree(spa->spa_name); 681fa9e4066Sahrens spa->spa_name = spa_strdup(newname); 682fa9e4066Sahrens avl_add(&spa_namespace_avl, spa); 683fa9e4066Sahrens 684fa9e4066Sahrens /* 685fa9e4066Sahrens * Sync all labels to disk with the new names by marking the root vdev 686fa9e4066Sahrens * dirty and waiting for it to sync. It will pick up the new pool name 687fa9e4066Sahrens * during the sync. 688fa9e4066Sahrens */ 689fa9e4066Sahrens vdev_config_dirty(spa->spa_root_vdev); 690fa9e4066Sahrens 691ea8dc4b6Seschrock spa_config_exit(spa, FTAG); 692fa9e4066Sahrens 6930373e76bSbonwick txg_wait_synced(spa->spa_dsl_pool, 0); 694fa9e4066Sahrens 695fa9e4066Sahrens /* 696fa9e4066Sahrens * Sync the updated config cache. 697fa9e4066Sahrens */ 698fa9e4066Sahrens spa_config_sync(); 699fa9e4066Sahrens 700fa9e4066Sahrens spa_close(spa, FTAG); 701fa9e4066Sahrens 702fa9e4066Sahrens mutex_exit(&spa_namespace_lock); 703fa9e4066Sahrens 704fa9e4066Sahrens return (0); 705fa9e4066Sahrens } 706fa9e4066Sahrens 707fa9e4066Sahrens 708fa9e4066Sahrens /* 709fa9e4066Sahrens * Determine whether a pool with given pool_guid exists. If device_guid is 710fa9e4066Sahrens * non-zero, determine whether the pool exists *and* contains a device with the 711fa9e4066Sahrens * specified device_guid. 712fa9e4066Sahrens */ 713fa9e4066Sahrens boolean_t 714fa9e4066Sahrens spa_guid_exists(uint64_t pool_guid, uint64_t device_guid) 715fa9e4066Sahrens { 716fa9e4066Sahrens spa_t *spa; 717fa9e4066Sahrens avl_tree_t *t = &spa_namespace_avl; 718fa9e4066Sahrens 719ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&spa_namespace_lock)); 720fa9e4066Sahrens 721fa9e4066Sahrens for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) { 722fa9e4066Sahrens if (spa->spa_state == POOL_STATE_UNINITIALIZED) 723fa9e4066Sahrens continue; 724fa9e4066Sahrens if (spa->spa_root_vdev == NULL) 725fa9e4066Sahrens continue; 72639c23413Seschrock if (spa_guid(spa) == pool_guid) { 72739c23413Seschrock if (device_guid == 0) 72839c23413Seschrock break; 72939c23413Seschrock 73039c23413Seschrock if (vdev_lookup_by_guid(spa->spa_root_vdev, 73139c23413Seschrock device_guid) != NULL) 73239c23413Seschrock break; 73339c23413Seschrock 73439c23413Seschrock /* 7358654d025Sperrin * Check any devices we may be in the process of adding. 73639c23413Seschrock */ 73739c23413Seschrock if (spa->spa_pending_vdev) { 73839c23413Seschrock if (vdev_lookup_by_guid(spa->spa_pending_vdev, 73939c23413Seschrock device_guid) != NULL) 74039c23413Seschrock break; 74139c23413Seschrock } 74239c23413Seschrock } 743fa9e4066Sahrens } 744fa9e4066Sahrens 745fa9e4066Sahrens return (spa != NULL); 746fa9e4066Sahrens } 747fa9e4066Sahrens 748fa9e4066Sahrens char * 749fa9e4066Sahrens spa_strdup(const char *s) 750fa9e4066Sahrens { 751fa9e4066Sahrens size_t len; 752fa9e4066Sahrens char *new; 753fa9e4066Sahrens 754fa9e4066Sahrens len = strlen(s); 755fa9e4066Sahrens new = kmem_alloc(len + 1, KM_SLEEP); 756fa9e4066Sahrens bcopy(s, new, len); 757fa9e4066Sahrens new[len] = '\0'; 758fa9e4066Sahrens 759fa9e4066Sahrens return (new); 760fa9e4066Sahrens } 761fa9e4066Sahrens 762fa9e4066Sahrens void 763fa9e4066Sahrens spa_strfree(char *s) 764fa9e4066Sahrens { 765fa9e4066Sahrens kmem_free(s, strlen(s) + 1); 766fa9e4066Sahrens } 767fa9e4066Sahrens 768fa9e4066Sahrens uint64_t 769fa9e4066Sahrens spa_get_random(uint64_t range) 770fa9e4066Sahrens { 771fa9e4066Sahrens uint64_t r; 772fa9e4066Sahrens 773fa9e4066Sahrens ASSERT(range != 0); 774fa9e4066Sahrens 775fa9e4066Sahrens (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t)); 776fa9e4066Sahrens 777fa9e4066Sahrens return (r % range); 778fa9e4066Sahrens } 779fa9e4066Sahrens 780fa9e4066Sahrens void 781d80c45e0Sbonwick sprintf_blkptr(char *buf, int len, const blkptr_t *bp) 782fa9e4066Sahrens { 78344cd46caSbillm int d; 784fa9e4066Sahrens 785fa9e4066Sahrens if (bp == NULL) { 786fbabab8fSmaybee (void) snprintf(buf, len, "<NULL>"); 787fa9e4066Sahrens return; 788fa9e4066Sahrens } 789fa9e4066Sahrens 790fa9e4066Sahrens if (BP_IS_HOLE(bp)) { 791fbabab8fSmaybee (void) snprintf(buf, len, "<hole>"); 792fa9e4066Sahrens return; 793fa9e4066Sahrens } 794fa9e4066Sahrens 79544cd46caSbillm (void) snprintf(buf, len, "[L%llu %s] %llxL/%llxP ", 796fa9e4066Sahrens (u_longlong_t)BP_GET_LEVEL(bp), 797fa9e4066Sahrens dmu_ot[BP_GET_TYPE(bp)].ot_name, 798fa9e4066Sahrens (u_longlong_t)BP_GET_LSIZE(bp), 79944cd46caSbillm (u_longlong_t)BP_GET_PSIZE(bp)); 80044cd46caSbillm 80144cd46caSbillm for (d = 0; d < BP_GET_NDVAS(bp); d++) { 802d80c45e0Sbonwick const dva_t *dva = &bp->blk_dva[d]; 80344cd46caSbillm (void) snprintf(buf + strlen(buf), len - strlen(buf), 80444cd46caSbillm "DVA[%d]=<%llu:%llx:%llx> ", d, 80544cd46caSbillm (u_longlong_t)DVA_GET_VDEV(dva), 80644cd46caSbillm (u_longlong_t)DVA_GET_OFFSET(dva), 80744cd46caSbillm (u_longlong_t)DVA_GET_ASIZE(dva)); 80844cd46caSbillm } 80944cd46caSbillm 81044cd46caSbillm (void) snprintf(buf + strlen(buf), len - strlen(buf), 81144cd46caSbillm "%s %s %s %s birth=%llu fill=%llu cksum=%llx:%llx:%llx:%llx", 812fa9e4066Sahrens zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name, 813fa9e4066Sahrens zio_compress_table[BP_GET_COMPRESS(bp)].ci_name, 814fa9e4066Sahrens BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE", 81544cd46caSbillm BP_IS_GANG(bp) ? "gang" : "contiguous", 816fa9e4066Sahrens (u_longlong_t)bp->blk_birth, 817fa9e4066Sahrens (u_longlong_t)bp->blk_fill, 818fa9e4066Sahrens (u_longlong_t)bp->blk_cksum.zc_word[0], 819fa9e4066Sahrens (u_longlong_t)bp->blk_cksum.zc_word[1], 820fa9e4066Sahrens (u_longlong_t)bp->blk_cksum.zc_word[2], 821fa9e4066Sahrens (u_longlong_t)bp->blk_cksum.zc_word[3]); 822fa9e4066Sahrens } 823fa9e4066Sahrens 824fa9e4066Sahrens void 825fa9e4066Sahrens spa_freeze(spa_t *spa) 826fa9e4066Sahrens { 827fa9e4066Sahrens uint64_t freeze_txg = 0; 828fa9e4066Sahrens 829ea8dc4b6Seschrock spa_config_enter(spa, RW_WRITER, FTAG); 830fa9e4066Sahrens if (spa->spa_freeze_txg == UINT64_MAX) { 831fa9e4066Sahrens freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE; 832fa9e4066Sahrens spa->spa_freeze_txg = freeze_txg; 833fa9e4066Sahrens } 834ea8dc4b6Seschrock spa_config_exit(spa, FTAG); 835fa9e4066Sahrens if (freeze_txg != 0) 836fa9e4066Sahrens txg_wait_synced(spa_get_dsl(spa), freeze_txg); 837fa9e4066Sahrens } 838fa9e4066Sahrens 8390125049cSahrens void 8400125049cSahrens zfs_panic_recover(const char *fmt, ...) 8410125049cSahrens { 8420125049cSahrens va_list adx; 8430125049cSahrens 8440125049cSahrens va_start(adx, fmt); 8450125049cSahrens vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx); 8460125049cSahrens va_end(adx); 8470125049cSahrens } 8480125049cSahrens 849fa9e4066Sahrens /* 850fa9e4066Sahrens * ========================================================================== 851fa9e4066Sahrens * Accessor functions 852fa9e4066Sahrens * ========================================================================== 853fa9e4066Sahrens */ 854fa9e4066Sahrens 855fa9e4066Sahrens krwlock_t * 856fa9e4066Sahrens spa_traverse_rwlock(spa_t *spa) 857fa9e4066Sahrens { 858fa9e4066Sahrens return (&spa->spa_traverse_lock); 859fa9e4066Sahrens } 860fa9e4066Sahrens 861fa9e4066Sahrens int 862fa9e4066Sahrens spa_traverse_wanted(spa_t *spa) 863fa9e4066Sahrens { 864fa9e4066Sahrens return (spa->spa_traverse_wanted); 865fa9e4066Sahrens } 866fa9e4066Sahrens 867fa9e4066Sahrens dsl_pool_t * 868fa9e4066Sahrens spa_get_dsl(spa_t *spa) 869fa9e4066Sahrens { 870fa9e4066Sahrens return (spa->spa_dsl_pool); 871fa9e4066Sahrens } 872fa9e4066Sahrens 873fa9e4066Sahrens blkptr_t * 874fa9e4066Sahrens spa_get_rootblkptr(spa_t *spa) 875fa9e4066Sahrens { 876fa9e4066Sahrens return (&spa->spa_ubsync.ub_rootbp); 877fa9e4066Sahrens } 878fa9e4066Sahrens 879fa9e4066Sahrens void 880fa9e4066Sahrens spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp) 881fa9e4066Sahrens { 882fa9e4066Sahrens spa->spa_uberblock.ub_rootbp = *bp; 883fa9e4066Sahrens } 884fa9e4066Sahrens 885fa9e4066Sahrens void 886fa9e4066Sahrens spa_altroot(spa_t *spa, char *buf, size_t buflen) 887fa9e4066Sahrens { 888fa9e4066Sahrens if (spa->spa_root == NULL) 889fa9e4066Sahrens buf[0] = '\0'; 890fa9e4066Sahrens else 891fa9e4066Sahrens (void) strncpy(buf, spa->spa_root, buflen); 892fa9e4066Sahrens } 893fa9e4066Sahrens 894fa9e4066Sahrens int 895fa9e4066Sahrens spa_sync_pass(spa_t *spa) 896fa9e4066Sahrens { 897fa9e4066Sahrens return (spa->spa_sync_pass); 898fa9e4066Sahrens } 899fa9e4066Sahrens 900fa9e4066Sahrens char * 901fa9e4066Sahrens spa_name(spa_t *spa) 902fa9e4066Sahrens { 903fa9e4066Sahrens /* 904fa9e4066Sahrens * Accessing the name requires holding either the namespace lock or the 905fa9e4066Sahrens * config lock, both of which are required to do a rename. 906fa9e4066Sahrens */ 907fa9e4066Sahrens ASSERT(MUTEX_HELD(&spa_namespace_lock) || 908fa9e4066Sahrens spa_config_held(spa, RW_READER) || spa_config_held(spa, RW_WRITER)); 909fa9e4066Sahrens 910fa9e4066Sahrens return (spa->spa_name); 911fa9e4066Sahrens } 912fa9e4066Sahrens 913fa9e4066Sahrens uint64_t 914fa9e4066Sahrens spa_guid(spa_t *spa) 915fa9e4066Sahrens { 916b5989ec7Seschrock /* 917b5989ec7Seschrock * If we fail to parse the config during spa_load(), we can go through 918b5989ec7Seschrock * the error path (which posts an ereport) and end up here with no root 919b5989ec7Seschrock * vdev. We stash the original pool guid in 'spa_load_guid' to handle 920b5989ec7Seschrock * this case. 921b5989ec7Seschrock */ 922b5989ec7Seschrock if (spa->spa_root_vdev != NULL) 923b5989ec7Seschrock return (spa->spa_root_vdev->vdev_guid); 924b5989ec7Seschrock else 925b5989ec7Seschrock return (spa->spa_load_guid); 926fa9e4066Sahrens } 927fa9e4066Sahrens 928fa9e4066Sahrens uint64_t 929fa9e4066Sahrens spa_last_synced_txg(spa_t *spa) 930fa9e4066Sahrens { 931fa9e4066Sahrens return (spa->spa_ubsync.ub_txg); 932fa9e4066Sahrens } 933fa9e4066Sahrens 934fa9e4066Sahrens uint64_t 935fa9e4066Sahrens spa_first_txg(spa_t *spa) 936fa9e4066Sahrens { 937fa9e4066Sahrens return (spa->spa_first_txg); 938fa9e4066Sahrens } 939fa9e4066Sahrens 940fa9e4066Sahrens int 941fa9e4066Sahrens spa_state(spa_t *spa) 942fa9e4066Sahrens { 943fa9e4066Sahrens return (spa->spa_state); 944fa9e4066Sahrens } 945fa9e4066Sahrens 946fa9e4066Sahrens uint64_t 947fa9e4066Sahrens spa_freeze_txg(spa_t *spa) 948fa9e4066Sahrens { 949fa9e4066Sahrens return (spa->spa_freeze_txg); 950fa9e4066Sahrens } 951fa9e4066Sahrens 952fa9e4066Sahrens /* 95399653d4eSeschrock * Return how much space is allocated in the pool (ie. sum of all asize) 954fa9e4066Sahrens */ 955fa9e4066Sahrens uint64_t 956fa9e4066Sahrens spa_get_alloc(spa_t *spa) 957fa9e4066Sahrens { 958fa9e4066Sahrens return (spa->spa_root_vdev->vdev_stat.vs_alloc); 959fa9e4066Sahrens } 960fa9e4066Sahrens 961fa9e4066Sahrens /* 96299653d4eSeschrock * Return how much (raid-z inflated) space there is in the pool. 963fa9e4066Sahrens */ 964fa9e4066Sahrens uint64_t 965fa9e4066Sahrens spa_get_space(spa_t *spa) 966fa9e4066Sahrens { 967fa9e4066Sahrens return (spa->spa_root_vdev->vdev_stat.vs_space); 968fa9e4066Sahrens } 969fa9e4066Sahrens 97099653d4eSeschrock /* 97199653d4eSeschrock * Return the amount of raid-z-deflated space in the pool. 97299653d4eSeschrock */ 97399653d4eSeschrock uint64_t 97499653d4eSeschrock spa_get_dspace(spa_t *spa) 97599653d4eSeschrock { 97699653d4eSeschrock if (spa->spa_deflate) 97799653d4eSeschrock return (spa->spa_root_vdev->vdev_stat.vs_dspace); 97899653d4eSeschrock else 97999653d4eSeschrock return (spa->spa_root_vdev->vdev_stat.vs_space); 98099653d4eSeschrock } 98199653d4eSeschrock 982fa9e4066Sahrens /* ARGSUSED */ 983fa9e4066Sahrens uint64_t 984fa9e4066Sahrens spa_get_asize(spa_t *spa, uint64_t lsize) 985fa9e4066Sahrens { 986fa9e4066Sahrens /* 987fa9e4066Sahrens * For now, the worst case is 512-byte RAID-Z blocks, in which 988fa9e4066Sahrens * case the space requirement is exactly 2x; so just assume that. 98944cd46caSbillm * Add to this the fact that we can have up to 3 DVAs per bp, and 99044cd46caSbillm * we have to multiply by a total of 6x. 99144cd46caSbillm */ 99244cd46caSbillm return (lsize * 6); 99344cd46caSbillm } 99444cd46caSbillm 995*0a4e9518Sgw /* 996*0a4e9518Sgw * Return the failure mode that has been set to this pool. The default 997*0a4e9518Sgw * behavior will be to block all I/Os when a complete failure occurs. 998*0a4e9518Sgw */ 999*0a4e9518Sgw uint8_t 1000*0a4e9518Sgw spa_get_failmode(spa_t *spa) 1001*0a4e9518Sgw { 1002*0a4e9518Sgw return (spa->spa_failmode); 1003*0a4e9518Sgw } 1004*0a4e9518Sgw 100544cd46caSbillm uint64_t 100644cd46caSbillm spa_version(spa_t *spa) 100744cd46caSbillm { 100844cd46caSbillm return (spa->spa_ubsync.ub_version); 100944cd46caSbillm } 101044cd46caSbillm 101144cd46caSbillm int 101244cd46caSbillm spa_max_replication(spa_t *spa) 101344cd46caSbillm { 101444cd46caSbillm /* 1015e7437265Sahrens * As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to 101644cd46caSbillm * handle BPs with more than one DVA allocated. Set our max 101744cd46caSbillm * replication level accordingly. 1018fa9e4066Sahrens */ 1019e7437265Sahrens if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS) 102044cd46caSbillm return (1); 102144cd46caSbillm return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override)); 1022fa9e4066Sahrens } 1023fa9e4066Sahrens 102499653d4eSeschrock uint64_t 102599653d4eSeschrock bp_get_dasize(spa_t *spa, const blkptr_t *bp) 102699653d4eSeschrock { 102799653d4eSeschrock int sz = 0, i; 102899653d4eSeschrock 102999653d4eSeschrock if (!spa->spa_deflate) 103099653d4eSeschrock return (BP_GET_ASIZE(bp)); 103199653d4eSeschrock 10321934e92fSmaybee spa_config_enter(spa, RW_READER, FTAG); 103399653d4eSeschrock for (i = 0; i < SPA_DVAS_PER_BP; i++) { 103499653d4eSeschrock vdev_t *vd = 103599653d4eSeschrock vdev_lookup_top(spa, DVA_GET_VDEV(&bp->blk_dva[i])); 10361934e92fSmaybee if (vd) 10371934e92fSmaybee sz += (DVA_GET_ASIZE(&bp->blk_dva[i]) >> 10381934e92fSmaybee SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio; 103999653d4eSeschrock } 10401934e92fSmaybee spa_config_exit(spa, FTAG); 104199653d4eSeschrock return (sz); 104299653d4eSeschrock } 104399653d4eSeschrock 1044fa9e4066Sahrens /* 1045fa9e4066Sahrens * ========================================================================== 1046fa9e4066Sahrens * Initialization and Termination 1047fa9e4066Sahrens * ========================================================================== 1048fa9e4066Sahrens */ 1049fa9e4066Sahrens 1050fa9e4066Sahrens static int 1051fa9e4066Sahrens spa_name_compare(const void *a1, const void *a2) 1052fa9e4066Sahrens { 1053fa9e4066Sahrens const spa_t *s1 = a1; 1054fa9e4066Sahrens const spa_t *s2 = a2; 1055fa9e4066Sahrens int s; 1056fa9e4066Sahrens 1057fa9e4066Sahrens s = strcmp(s1->spa_name, s2->spa_name); 1058fa9e4066Sahrens if (s > 0) 1059fa9e4066Sahrens return (1); 1060fa9e4066Sahrens if (s < 0) 1061fa9e4066Sahrens return (-1); 1062fa9e4066Sahrens return (0); 1063fa9e4066Sahrens } 1064fa9e4066Sahrens 10650373e76bSbonwick int 10660373e76bSbonwick spa_busy(void) 10670373e76bSbonwick { 10680373e76bSbonwick return (spa_active_count); 10690373e76bSbonwick } 10700373e76bSbonwick 1071fa9e4066Sahrens void 1072fa9e4066Sahrens spa_init(int mode) 1073fa9e4066Sahrens { 1074fa9e4066Sahrens mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL); 1075c25056deSgw mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL); 1076fa9e4066Sahrens cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL); 1077fa9e4066Sahrens 1078fa9e4066Sahrens avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t), 1079fa9e4066Sahrens offsetof(spa_t, spa_avl)); 1080fa9e4066Sahrens 108199653d4eSeschrock avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_spare_t), 108299653d4eSeschrock offsetof(spa_spare_t, spare_avl)); 108399653d4eSeschrock 1084fa9e4066Sahrens spa_mode = mode; 1085fa9e4066Sahrens 1086fa9e4066Sahrens refcount_init(); 1087fa9e4066Sahrens unique_init(); 1088fa9e4066Sahrens zio_init(); 1089fa9e4066Sahrens dmu_init(); 1090fa9e4066Sahrens zil_init(); 109191ebeef5Sahrens zfs_prop_init(); 1092990b4856Slling zpool_prop_init(); 1093fa9e4066Sahrens spa_config_load(); 1094fa9e4066Sahrens } 1095fa9e4066Sahrens 1096fa9e4066Sahrens void 1097fa9e4066Sahrens spa_fini(void) 1098fa9e4066Sahrens { 1099fa9e4066Sahrens spa_evict_all(); 1100fa9e4066Sahrens 1101fa9e4066Sahrens zil_fini(); 1102fa9e4066Sahrens dmu_fini(); 1103fa9e4066Sahrens zio_fini(); 110491ebeef5Sahrens unique_fini(); 1105fa9e4066Sahrens refcount_fini(); 1106fa9e4066Sahrens 1107fa9e4066Sahrens avl_destroy(&spa_namespace_avl); 110899653d4eSeschrock avl_destroy(&spa_spare_avl); 1109fa9e4066Sahrens 1110fa9e4066Sahrens cv_destroy(&spa_namespace_cv); 1111fa9e4066Sahrens mutex_destroy(&spa_namespace_lock); 1112c25056deSgw mutex_destroy(&spa_spare_lock); 1113fa9e4066Sahrens } 11146ce0521aSperrin 11156ce0521aSperrin /* 11166ce0521aSperrin * Return whether this pool has slogs. No locking needed. 11176ce0521aSperrin * It's not a problem if the wrong answer is returned as it's only for 11186ce0521aSperrin * performance and not correctness 11196ce0521aSperrin */ 11206ce0521aSperrin boolean_t 11216ce0521aSperrin spa_has_slogs(spa_t *spa) 11226ce0521aSperrin { 11236ce0521aSperrin return (spa->spa_log_class->mc_rotor != NULL); 11246ce0521aSperrin } 1125