diff options
Diffstat (limited to 'sys/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c')
| -rw-r--r-- | sys/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c | 1130 |
1 files changed, 0 insertions, 1130 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c b/sys/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c deleted file mode 100644 index 5da1f96..0000000 --- a/sys/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c +++ /dev/null @@ -1,1130 +0,0 @@ -/* - * CDDL HEADER START - * - * The contents of this file are subject to the terms of the - * Common Development and Distribution License (the "License"). - * You may not use this file except in compliance with the License. - * - * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE - * or http://www.opensolaris.org/os/licensing. - * See the License for the specific language governing permissions - * and limitations under the License. - * - * When distributing Covered Code, include this CDDL HEADER in each - * file and include the License file at usr/src/OPENSOLARIS.LICENSE. - * If applicable, add the following below this CDDL HEADER, with the - * fields enclosed by brackets "[]" replaced with your own identifying - * information: Portions Copyright [yyyy] [name of copyright owner] - * - * CDDL HEADER END - */ -/* - * Copyright 2007 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - */ - -#pragma ident "%Z%%M% %I% %E% SMI" - -#include <sys/zfs_context.h> -#include <sys/spa_impl.h> -#include <sys/zio.h> -#include <sys/zio_checksum.h> -#include <sys/zio_compress.h> -#include <sys/dmu.h> -#include <sys/dmu_tx.h> -#include <sys/zap.h> -#include <sys/zil.h> -#include <sys/vdev_impl.h> -#include <sys/metaslab.h> -#include <sys/uberblock_impl.h> -#include <sys/txg.h> -#include <sys/avl.h> -#include <sys/unique.h> -#include <sys/dsl_pool.h> -#include <sys/dsl_dir.h> -#include <sys/dsl_prop.h> -#include <sys/fs/zfs.h> - -/* - * SPA locking - * - * There are four basic locks for managing spa_t structures: - * - * spa_namespace_lock (global mutex) - * - * This lock must be acquired to do any of the following: - * - * - Lookup a spa_t by name - * - Add or remove a spa_t from the namespace - * - Increase spa_refcount from non-zero - * - Check if spa_refcount is zero - * - Rename a spa_t - * - add/remove/attach/detach devices - * - Held for the duration of create/destroy/import/export - * - * It does not need to handle recursion. A create or destroy may - * reference objects (files or zvols) in other pools, but by - * definition they must have an existing reference, and will never need - * to lookup a spa_t by name. - * - * spa_refcount (per-spa refcount_t protected by mutex) - * - * This reference count keep track of any active users of the spa_t. The - * spa_t cannot be destroyed or freed while this is non-zero. Internally, - * the refcount is never really 'zero' - opening a pool implicitly keeps - * some references in the DMU. Internally we check against SPA_MINREF, but - * present the image of a zero/non-zero value to consumers. - * - * spa_config_lock (per-spa crazy rwlock) - * - * This SPA special is a recursive rwlock, capable of being acquired from - * asynchronous threads. It has protects the spa_t from config changes, - * and must be held in the following circumstances: - * - * - RW_READER to perform I/O to the spa - * - RW_WRITER to change the vdev config - * - * spa_config_cache_lock (per-spa mutex) - * - * This mutex prevents the spa_config nvlist from being updated. No - * other locks are required to obtain this lock, although implicitly you - * must have the namespace lock or non-zero refcount to have any kind - * of spa_t pointer at all. - * - * The locking order is fairly straightforward: - * - * spa_namespace_lock -> spa_refcount - * - * The namespace lock must be acquired to increase the refcount from 0 - * or to check if it is zero. - * - * spa_refcount -> spa_config_lock - * - * There must be at least one valid reference on the spa_t to acquire - * the config lock. - * - * spa_namespace_lock -> spa_config_lock - * - * The namespace lock must always be taken before the config lock. - * - * - * The spa_namespace_lock and spa_config_cache_lock can be acquired directly and - * are globally visible. - * - * The namespace is manipulated using the following functions, all which require - * the spa_namespace_lock to be held. - * - * spa_lookup() Lookup a spa_t by name. - * - * spa_add() Create a new spa_t in the namespace. - * - * spa_remove() Remove a spa_t from the namespace. This also - * frees up any memory associated with the spa_t. - * - * spa_next() Returns the next spa_t in the system, or the - * first if NULL is passed. - * - * spa_evict_all() Shutdown and remove all spa_t structures in - * the system. - * - * spa_guid_exists() Determine whether a pool/device guid exists. - * - * The spa_refcount is manipulated using the following functions: - * - * spa_open_ref() Adds a reference to the given spa_t. Must be - * called with spa_namespace_lock held if the - * refcount is currently zero. - * - * spa_close() Remove a reference from the spa_t. This will - * not free the spa_t or remove it from the - * namespace. No locking is required. - * - * spa_refcount_zero() Returns true if the refcount is currently - * zero. Must be called with spa_namespace_lock - * held. - * - * The spa_config_lock is manipulated using the following functions: - * - * spa_config_enter() Acquire the config lock as RW_READER or - * RW_WRITER. At least one reference on the spa_t - * must exist. - * - * spa_config_exit() Release the config lock. - * - * spa_config_held() Returns true if the config lock is currently - * held in the given state. - * - * The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit(). - * - * spa_vdev_enter() Acquire the namespace lock and the config lock - * for writing. - * - * spa_vdev_exit() Release the config lock, wait for all I/O - * to complete, sync the updated configs to the - * cache, and release the namespace lock. - * - * The spa_name() function also requires either the spa_namespace_lock - * or the spa_config_lock, as both are needed to do a rename. spa_rename() is - * also implemented within this file since is requires manipulation of the - * namespace. - */ - -static avl_tree_t spa_namespace_avl; -kmutex_t spa_namespace_lock; -static kcondvar_t spa_namespace_cv; -static int spa_active_count; -int spa_max_replication_override = SPA_DVAS_PER_BP; - -static kmutex_t spa_spare_lock; -static avl_tree_t spa_spare_avl; - -kmem_cache_t *spa_buffer_pool; -int spa_mode; - -#ifdef ZFS_DEBUG -int zfs_flags = ~0; -#else -int zfs_flags = 0; -#endif - -/* - * zfs_recover can be set to nonzero to attempt to recover from - * otherwise-fatal errors, typically caused by on-disk corruption. When - * set, calls to zfs_panic_recover() will turn into warning messages. - */ -int zfs_recover = 0; -SYSCTL_DECL(_vfs_zfs); -TUNABLE_INT("vfs.zfs.recover", &zfs_recover); -SYSCTL_INT(_vfs_zfs, OID_AUTO, recover, CTLFLAG_RDTUN, &zfs_recover, 0, - "Try to recover from otherwise-fatal errors."); - -#define SPA_MINREF 5 /* spa_refcnt for an open-but-idle pool */ - -/* - * ========================================================================== - * SPA namespace functions - * ========================================================================== - */ - -/* - * Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held. - * Returns NULL if no matching spa_t is found. - */ -spa_t * -spa_lookup(const char *name) -{ - spa_t search, *spa; - avl_index_t where; - - ASSERT(MUTEX_HELD(&spa_namespace_lock)); - - search.spa_name = (char *)name; - spa = avl_find(&spa_namespace_avl, &search, &where); - - return (spa); -} - -/* - * Create an uninitialized spa_t with the given name. Requires - * spa_namespace_lock. The caller must ensure that the spa_t doesn't already - * exist by calling spa_lookup() first. - */ -spa_t * -spa_add(const char *name, const char *altroot) -{ - spa_t *spa; - - ASSERT(MUTEX_HELD(&spa_namespace_lock)); - - spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP); - - spa->spa_name = spa_strdup(name); - spa->spa_state = POOL_STATE_UNINITIALIZED; - spa->spa_freeze_txg = UINT64_MAX; - spa->spa_final_txg = UINT64_MAX; - - mutex_init(&spa->spa_config_cache_lock, NULL, MUTEX_DEFAULT, NULL); - mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL); - mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL); - - cv_init(&spa->spa_scrub_cv, NULL, CV_DEFAULT, NULL); - cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL); - cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL); - - refcount_create(&spa->spa_refcount); - refcount_create(&spa->spa_config_lock.scl_count); - - avl_add(&spa_namespace_avl, spa); - - /* - * Set the alternate root, if there is one. - */ - if (altroot) { - spa->spa_root = spa_strdup(altroot); - spa_active_count++; - } - - return (spa); -} - -/* - * Removes a spa_t from the namespace, freeing up any memory used. Requires - * spa_namespace_lock. This is called only after the spa_t has been closed and - * deactivated. - */ -void -spa_remove(spa_t *spa) -{ - ASSERT(MUTEX_HELD(&spa_namespace_lock)); - ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); - ASSERT(spa->spa_scrub_thread == NULL); - - avl_remove(&spa_namespace_avl, spa); - cv_broadcast(&spa_namespace_cv); - - if (spa->spa_root) { - spa_strfree(spa->spa_root); - spa_active_count--; - } - - if (spa->spa_name) - spa_strfree(spa->spa_name); - - spa_config_set(spa, NULL); - - refcount_destroy(&spa->spa_refcount); - refcount_destroy(&spa->spa_config_lock.scl_count); - - cv_destroy(&spa->spa_async_cv); - cv_destroy(&spa->spa_scrub_io_cv); - cv_destroy(&spa->spa_scrub_cv); - - mutex_destroy(&spa->spa_scrub_lock); - mutex_destroy(&spa->spa_async_lock); - mutex_destroy(&spa->spa_config_cache_lock); - - kmem_free(spa, sizeof (spa_t)); -} - -/* - * Given a pool, return the next pool in the namespace, or NULL if there is - * none. If 'prev' is NULL, return the first pool. - */ -spa_t * -spa_next(spa_t *prev) -{ - ASSERT(MUTEX_HELD(&spa_namespace_lock)); - - if (prev) - return (AVL_NEXT(&spa_namespace_avl, prev)); - else - return (avl_first(&spa_namespace_avl)); -} - -/* - * ========================================================================== - * SPA refcount functions - * ========================================================================== - */ - -/* - * Add a reference to the given spa_t. Must have at least one reference, or - * have the namespace lock held. - */ -void -spa_open_ref(spa_t *spa, void *tag) -{ - ASSERT(refcount_count(&spa->spa_refcount) > SPA_MINREF || - MUTEX_HELD(&spa_namespace_lock)); - - (void) refcount_add(&spa->spa_refcount, tag); -} - -/* - * Remove a reference to the given spa_t. Must have at least one reference, or - * have the namespace lock held. - */ -void -spa_close(spa_t *spa, void *tag) -{ - ASSERT(refcount_count(&spa->spa_refcount) > SPA_MINREF || - MUTEX_HELD(&spa_namespace_lock)); - - (void) refcount_remove(&spa->spa_refcount, tag); -} - -/* - * Check to see if the spa refcount is zero. Must be called with - * spa_namespace_lock held. We really compare against SPA_MINREF, which is the - * number of references acquired when opening a pool - */ -boolean_t -spa_refcount_zero(spa_t *spa) -{ - ASSERT(MUTEX_HELD(&spa_namespace_lock)); - - return (refcount_count(&spa->spa_refcount) == SPA_MINREF); -} - -/* - * ========================================================================== - * SPA spare tracking - * ========================================================================== - */ - -/* - * Spares are tracked globally due to the following constraints: - * - * - A spare may be part of multiple pools. - * - A spare may be added to a pool even if it's actively in use within - * another pool. - * - A spare in use in any pool can only be the source of a replacement if - * the target is a spare in the same pool. - * - * We keep track of all spares on the system through the use of a reference - * counted AVL tree. When a vdev is added as a spare, or used as a replacement - * spare, then we bump the reference count in the AVL tree. In addition, we set - * the 'vdev_isspare' member to indicate that the device is a spare (active or - * inactive). When a spare is made active (used to replace a device in the - * pool), we also keep track of which pool its been made a part of. - * - * The 'spa_spare_lock' protects the AVL tree. These functions are normally - * called under the spa_namespace lock as part of vdev reconfiguration. The - * separate spare lock exists for the status query path, which does not need to - * be completely consistent with respect to other vdev configuration changes. - */ - -typedef struct spa_spare { - uint64_t spare_guid; - uint64_t spare_pool; - avl_node_t spare_avl; - int spare_count; -} spa_spare_t; - -static int -spa_spare_compare(const void *a, const void *b) -{ - const spa_spare_t *sa = a; - const spa_spare_t *sb = b; - - if (sa->spare_guid < sb->spare_guid) - return (-1); - else if (sa->spare_guid > sb->spare_guid) - return (1); - else - return (0); -} - -void -spa_spare_add(vdev_t *vd) -{ - avl_index_t where; - spa_spare_t search; - spa_spare_t *spare; - - mutex_enter(&spa_spare_lock); - ASSERT(!vd->vdev_isspare); - - search.spare_guid = vd->vdev_guid; - if ((spare = avl_find(&spa_spare_avl, &search, &where)) != NULL) { - spare->spare_count++; - } else { - spare = kmem_zalloc(sizeof (spa_spare_t), KM_SLEEP); - spare->spare_guid = vd->vdev_guid; - spare->spare_count = 1; - avl_insert(&spa_spare_avl, spare, where); - } - vd->vdev_isspare = B_TRUE; - - mutex_exit(&spa_spare_lock); -} - -void -spa_spare_remove(vdev_t *vd) -{ - spa_spare_t search; - spa_spare_t *spare; - avl_index_t where; - - mutex_enter(&spa_spare_lock); - - search.spare_guid = vd->vdev_guid; - spare = avl_find(&spa_spare_avl, &search, &where); - - ASSERT(vd->vdev_isspare); - ASSERT(spare != NULL); - - if (--spare->spare_count == 0) { - avl_remove(&spa_spare_avl, spare); - kmem_free(spare, sizeof (spa_spare_t)); - } else if (spare->spare_pool == spa_guid(vd->vdev_spa)) { - spare->spare_pool = 0ULL; - } - - vd->vdev_isspare = B_FALSE; - mutex_exit(&spa_spare_lock); -} - -boolean_t -spa_spare_exists(uint64_t guid, uint64_t *pool) -{ - spa_spare_t search, *found; - avl_index_t where; - - mutex_enter(&spa_spare_lock); - - search.spare_guid = guid; - found = avl_find(&spa_spare_avl, &search, &where); - - if (pool) { - if (found) - *pool = found->spare_pool; - else - *pool = 0ULL; - } - - mutex_exit(&spa_spare_lock); - - return (found != NULL); -} - -void -spa_spare_activate(vdev_t *vd) -{ - spa_spare_t search, *found; - avl_index_t where; - - mutex_enter(&spa_spare_lock); - ASSERT(vd->vdev_isspare); - - search.spare_guid = vd->vdev_guid; - found = avl_find(&spa_spare_avl, &search, &where); - ASSERT(found != NULL); - ASSERT(found->spare_pool == 0ULL); - - found->spare_pool = spa_guid(vd->vdev_spa); - mutex_exit(&spa_spare_lock); -} - -/* - * ========================================================================== - * SPA config locking - * ========================================================================== - */ - -/* - * Acquire the config lock. The config lock is a special rwlock that allows for - * recursive enters. Because these enters come from the same thread as well as - * asynchronous threads working on behalf of the owner, we must unilaterally - * allow all reads access as long at least one reader is held (even if a write - * is requested). This has the side effect of write starvation, but write locks - * are extremely rare, and a solution to this problem would be significantly - * more complex (if even possible). - * - * We would like to assert that the namespace lock isn't held, but this is a - * valid use during create. - */ -void -spa_config_enter(spa_t *spa, krw_t rw, void *tag) -{ - spa_config_lock_t *scl = &spa->spa_config_lock; - - mutex_enter(&scl->scl_lock); - - if (scl->scl_writer != curthread) { - if (rw == RW_READER) { - while (scl->scl_writer != NULL) - cv_wait(&scl->scl_cv, &scl->scl_lock); - } else { - while (scl->scl_writer != NULL || - !refcount_is_zero(&scl->scl_count)) - cv_wait(&scl->scl_cv, &scl->scl_lock); - scl->scl_writer = curthread; - } - } - - (void) refcount_add(&scl->scl_count, tag); - - mutex_exit(&scl->scl_lock); -} - -/* - * Release the spa config lock, notifying any waiters in the process. - */ -void -spa_config_exit(spa_t *spa, void *tag) -{ - spa_config_lock_t *scl = &spa->spa_config_lock; - - mutex_enter(&scl->scl_lock); - - ASSERT(!refcount_is_zero(&scl->scl_count)); - if (refcount_remove(&scl->scl_count, tag) == 0) { - cv_broadcast(&scl->scl_cv); - scl->scl_writer = NULL; /* OK in either case */ - } - - mutex_exit(&scl->scl_lock); -} - -/* - * Returns true if the config lock is held in the given manner. - */ -boolean_t -spa_config_held(spa_t *spa, krw_t rw) -{ - spa_config_lock_t *scl = &spa->spa_config_lock; - boolean_t held; - - mutex_enter(&scl->scl_lock); - if (rw == RW_WRITER) - held = (scl->scl_writer == curthread); - else - held = !refcount_is_zero(&scl->scl_count); - mutex_exit(&scl->scl_lock); - - return (held); -} - -/* - * ========================================================================== - * SPA vdev locking - * ========================================================================== - */ - -/* - * Lock the given spa_t for the purpose of adding or removing a vdev. - * Grabs the global spa_namespace_lock plus the spa config lock for writing. - * It returns the next transaction group for the spa_t. - */ -uint64_t -spa_vdev_enter(spa_t *spa) -{ - /* - * Suspend scrub activity while we mess with the config. - */ - spa_scrub_suspend(spa); - - mutex_enter(&spa_namespace_lock); - - spa_config_enter(spa, RW_WRITER, spa); - - return (spa_last_synced_txg(spa) + 1); -} - -/* - * Unlock the spa_t after adding or removing a vdev. Besides undoing the - * locking of spa_vdev_enter(), we also want make sure the transactions have - * synced to disk, and then update the global configuration cache with the new - * information. - */ -int -spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error) -{ - int config_changed = B_FALSE; - - ASSERT(txg > spa_last_synced_txg(spa)); - - /* - * Reassess the DTLs. - */ - vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE); - - /* - * If the config changed, notify the scrub thread that it must restart. - */ - if (error == 0 && !list_is_empty(&spa->spa_dirty_list)) { - config_changed = B_TRUE; - spa_scrub_restart(spa, txg); - } - - spa_config_exit(spa, spa); - - /* - * Allow scrubbing to resume. - */ - spa_scrub_resume(spa); - - /* - * Note: this txg_wait_synced() is important because it ensures - * that there won't be more than one config change per txg. - * This allows us to use the txg as the generation number. - */ - if (error == 0) - txg_wait_synced(spa->spa_dsl_pool, txg); - - if (vd != NULL) { - ASSERT(!vd->vdev_detached || vd->vdev_dtl.smo_object == 0); - vdev_free(vd); - } - - /* - * If the config changed, update the config cache. - */ - if (config_changed) - spa_config_sync(); - - mutex_exit(&spa_namespace_lock); - - return (error); -} - -/* - * ========================================================================== - * Miscellaneous functions - * ========================================================================== - */ - -/* - * Rename a spa_t. - */ -int -spa_rename(const char *name, const char *newname) -{ - spa_t *spa; - int err; - - /* - * Lookup the spa_t and grab the config lock for writing. We need to - * actually open the pool so that we can sync out the necessary labels. - * It's OK to call spa_open() with the namespace lock held because we - * allow recursive calls for other reasons. - */ - mutex_enter(&spa_namespace_lock); - if ((err = spa_open(name, &spa, FTAG)) != 0) { - mutex_exit(&spa_namespace_lock); - return (err); - } - - spa_config_enter(spa, RW_WRITER, FTAG); - - avl_remove(&spa_namespace_avl, spa); - spa_strfree(spa->spa_name); - spa->spa_name = spa_strdup(newname); - avl_add(&spa_namespace_avl, spa); - - /* - * Sync all labels to disk with the new names by marking the root vdev - * dirty and waiting for it to sync. It will pick up the new pool name - * during the sync. - */ - vdev_config_dirty(spa->spa_root_vdev); - - spa_config_exit(spa, FTAG); - - txg_wait_synced(spa->spa_dsl_pool, 0); - - /* - * Sync the updated config cache. - */ - spa_config_sync(); - - spa_close(spa, FTAG); - - mutex_exit(&spa_namespace_lock); - - return (0); -} - - -/* - * Determine whether a pool with given pool_guid exists. If device_guid is - * non-zero, determine whether the pool exists *and* contains a device with the - * specified device_guid. - */ -boolean_t -spa_guid_exists(uint64_t pool_guid, uint64_t device_guid) -{ - spa_t *spa; - avl_tree_t *t = &spa_namespace_avl; - - ASSERT(MUTEX_HELD(&spa_namespace_lock)); - - for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) { - if (spa->spa_state == POOL_STATE_UNINITIALIZED) - continue; - if (spa->spa_root_vdev == NULL) - continue; - if (spa_guid(spa) == pool_guid) { - if (device_guid == 0) - break; - - if (vdev_lookup_by_guid(spa->spa_root_vdev, - device_guid) != NULL) - break; - - /* - * Check any devices we may in the process of adding. - */ - if (spa->spa_pending_vdev) { - if (vdev_lookup_by_guid(spa->spa_pending_vdev, - device_guid) != NULL) - break; - } - } - } - - return (spa != NULL); -} - -char * -spa_strdup(const char *s) -{ - size_t len; - char *new; - - len = strlen(s); - new = kmem_alloc(len + 1, KM_SLEEP); - bcopy(s, new, len); - new[len] = '\0'; - - return (new); -} - -void -spa_strfree(char *s) -{ - kmem_free(s, strlen(s) + 1); -} - -uint64_t -spa_get_random(uint64_t range) -{ - uint64_t r; - - ASSERT(range != 0); - - (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t)); - - return (r % range); -} - -void -sprintf_blkptr(char *buf, int len, const blkptr_t *bp) -{ - int d; - - if (bp == NULL) { - (void) snprintf(buf, len, "<NULL>"); - return; - } - - if (BP_IS_HOLE(bp)) { - (void) snprintf(buf, len, "<hole>"); - return; - } - - (void) snprintf(buf, len, "[L%llu %s] %llxL/%llxP ", - (u_longlong_t)BP_GET_LEVEL(bp), - dmu_ot[BP_GET_TYPE(bp)].ot_name, - (u_longlong_t)BP_GET_LSIZE(bp), - (u_longlong_t)BP_GET_PSIZE(bp)); - - for (d = 0; d < BP_GET_NDVAS(bp); d++) { - const dva_t *dva = &bp->blk_dva[d]; - (void) snprintf(buf + strlen(buf), len - strlen(buf), - "DVA[%d]=<%llu:%llx:%llx> ", d, - (u_longlong_t)DVA_GET_VDEV(dva), - (u_longlong_t)DVA_GET_OFFSET(dva), - (u_longlong_t)DVA_GET_ASIZE(dva)); - } - - (void) snprintf(buf + strlen(buf), len - strlen(buf), - "%s %s %s %s birth=%llu fill=%llu cksum=%llx:%llx:%llx:%llx", - zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name, - zio_compress_table[BP_GET_COMPRESS(bp)].ci_name, - BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE", - BP_IS_GANG(bp) ? "gang" : "contiguous", - (u_longlong_t)bp->blk_birth, - (u_longlong_t)bp->blk_fill, - (u_longlong_t)bp->blk_cksum.zc_word[0], - (u_longlong_t)bp->blk_cksum.zc_word[1], - (u_longlong_t)bp->blk_cksum.zc_word[2], - (u_longlong_t)bp->blk_cksum.zc_word[3]); -} - -void -spa_freeze(spa_t *spa) -{ - uint64_t freeze_txg = 0; - - spa_config_enter(spa, RW_WRITER, FTAG); - if (spa->spa_freeze_txg == UINT64_MAX) { - freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE; - spa->spa_freeze_txg = freeze_txg; - } - spa_config_exit(spa, FTAG); - if (freeze_txg != 0) - txg_wait_synced(spa_get_dsl(spa), freeze_txg); -} - -void -zfs_panic_recover(const char *fmt, ...) -{ - va_list adx; - - va_start(adx, fmt); - vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx); - va_end(adx); -} - -/* - * ========================================================================== - * Accessor functions - * ========================================================================== - */ - -krwlock_t * -spa_traverse_rwlock(spa_t *spa) -{ - return (&spa->spa_traverse_lock); -} - -int -spa_traverse_wanted(spa_t *spa) -{ - return (spa->spa_traverse_wanted); -} - -dsl_pool_t * -spa_get_dsl(spa_t *spa) -{ - return (spa->spa_dsl_pool); -} - -blkptr_t * -spa_get_rootblkptr(spa_t *spa) -{ - return (&spa->spa_ubsync.ub_rootbp); -} - -void -spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp) -{ - spa->spa_uberblock.ub_rootbp = *bp; -} - -void -spa_altroot(spa_t *spa, char *buf, size_t buflen) -{ - if (spa->spa_root == NULL) - buf[0] = '\0'; - else - (void) strncpy(buf, spa->spa_root, buflen); -} - -int -spa_sync_pass(spa_t *spa) -{ - return (spa->spa_sync_pass); -} - -char * -spa_name(spa_t *spa) -{ - /* - * Accessing the name requires holding either the namespace lock or the - * config lock, both of which are required to do a rename. - */ - ASSERT(MUTEX_HELD(&spa_namespace_lock) || - spa_config_held(spa, RW_READER) || spa_config_held(spa, RW_WRITER)); - - return (spa->spa_name); -} - -uint64_t -spa_guid(spa_t *spa) -{ - /* - * If we fail to parse the config during spa_load(), we can go through - * the error path (which posts an ereport) and end up here with no root - * vdev. We stash the original pool guid in 'spa_load_guid' to handle - * this case. - */ - if (spa->spa_root_vdev != NULL) - return (spa->spa_root_vdev->vdev_guid); - else - return (spa->spa_load_guid); -} - -uint64_t -spa_last_synced_txg(spa_t *spa) -{ - return (spa->spa_ubsync.ub_txg); -} - -uint64_t -spa_first_txg(spa_t *spa) -{ - return (spa->spa_first_txg); -} - -int -spa_state(spa_t *spa) -{ - return (spa->spa_state); -} - -uint64_t -spa_freeze_txg(spa_t *spa) -{ - return (spa->spa_freeze_txg); -} - -/* - * In the future, this may select among different metaslab classes - * depending on the zdp. For now, there's no such distinction. - */ -metaslab_class_t * -spa_metaslab_class_select(spa_t *spa) -{ - return (spa->spa_normal_class); -} - -/* - * Return how much space is allocated in the pool (ie. sum of all asize) - */ -uint64_t -spa_get_alloc(spa_t *spa) -{ - return (spa->spa_root_vdev->vdev_stat.vs_alloc); -} - -/* - * Return how much (raid-z inflated) space there is in the pool. - */ -uint64_t -spa_get_space(spa_t *spa) -{ - return (spa->spa_root_vdev->vdev_stat.vs_space); -} - -/* - * Return the amount of raid-z-deflated space in the pool. - */ -uint64_t -spa_get_dspace(spa_t *spa) -{ - if (spa->spa_deflate) - return (spa->spa_root_vdev->vdev_stat.vs_dspace); - else - return (spa->spa_root_vdev->vdev_stat.vs_space); -} - -/* ARGSUSED */ -uint64_t -spa_get_asize(spa_t *spa, uint64_t lsize) -{ - /* - * For now, the worst case is 512-byte RAID-Z blocks, in which - * case the space requirement is exactly 2x; so just assume that. - * Add to this the fact that we can have up to 3 DVAs per bp, and - * we have to multiply by a total of 6x. - */ - return (lsize * 6); -} - -uint64_t -spa_version(spa_t *spa) -{ - return (spa->spa_ubsync.ub_version); -} - -int -spa_max_replication(spa_t *spa) -{ - /* - * As of ZFS_VERSION == ZFS_VERSION_DITTO_BLOCKS, we are able to - * handle BPs with more than one DVA allocated. Set our max - * replication level accordingly. - */ - if (spa_version(spa) < ZFS_VERSION_DITTO_BLOCKS) - return (1); - return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override)); -} - -uint64_t -bp_get_dasize(spa_t *spa, const blkptr_t *bp) -{ - int sz = 0, i; - - if (!spa->spa_deflate) - return (BP_GET_ASIZE(bp)); - - for (i = 0; i < SPA_DVAS_PER_BP; i++) { - vdev_t *vd = - vdev_lookup_top(spa, DVA_GET_VDEV(&bp->blk_dva[i])); - sz += (DVA_GET_ASIZE(&bp->blk_dva[i]) >> SPA_MINBLOCKSHIFT) * - vd->vdev_deflate_ratio; - } - return (sz); -} - -/* - * ========================================================================== - * Initialization and Termination - * ========================================================================== - */ - -static int -spa_name_compare(const void *a1, const void *a2) -{ - const spa_t *s1 = a1; - const spa_t *s2 = a2; - int s; - - s = strcmp(s1->spa_name, s2->spa_name); - if (s > 0) - return (1); - if (s < 0) - return (-1); - return (0); -} - -int -spa_busy(void) -{ - return (spa_active_count); -} - -void -spa_init(int mode) -{ - mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL); - cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL); - - avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t), - offsetof(spa_t, spa_avl)); - - mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL); - - avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_spare_t), - offsetof(spa_spare_t, spare_avl)); - - spa_mode = mode; - - refcount_init(); - unique_init(); - zio_init(); - dmu_init(); - zil_init(); - spa_config_load(); -} - -void -spa_fini(void) -{ - spa_evict_all(); - - zil_fini(); - dmu_fini(); - zio_fini(); - refcount_fini(); - - avl_destroy(&spa_namespace_avl); - avl_destroy(&spa_spare_avl); - - cv_destroy(&spa_namespace_cv); - mutex_destroy(&spa_namespace_lock); - mutex_destroy(&spa_spare_lock); -} |
