aboutsummaryrefslogtreecommitdiffstats
path: root/uts/common/fs/zfs/spa_misc.c
diff options
context:
space:
mode:
Diffstat (limited to 'uts/common/fs/zfs/spa_misc.c')
-rw-r--r--uts/common/fs/zfs/spa_misc.c1672
1 files changed, 1672 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/spa_misc.c b/uts/common/fs/zfs/spa_misc.c
new file mode 100644
index 000000000000..1b54afb0be5e
--- /dev/null
+++ b/uts/common/fs/zfs/spa_misc.c
@@ -0,0 +1,1672 @@
+/*
+ * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#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/dsl_scan.h>
+#include <sys/fs/zfs.h>
+#include <sys/metaslab_impl.h>
+#include <sys/arc.h>
+#include <sys/ddt.h>
+#include "zfs_prop.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 array of rwlocks)
+ *
+ * This 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
+ *
+ * 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 can be acquired directly and is globally visible.
+ *
+ * The namespace is manipulated using the following functions, all of 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 an array of rwlocks, ordered as follows:
+ * SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
+ * spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
+ *
+ * To read the configuration, it suffices to hold one of these locks as reader.
+ * To modify the configuration, you must hold all locks as writer. To modify
+ * vdev state without altering the vdev tree's topology (e.g. online/offline),
+ * you must hold SCL_STATE and SCL_ZIO as writer.
+ *
+ * We use these distinct config locks to avoid recursive lock entry.
+ * For example, spa_sync() (which holds SCL_CONFIG as reader) induces
+ * block allocations (SCL_ALLOC), which may require reading space maps
+ * from disk (dmu_read() -> zio_read() -> SCL_ZIO).
+ *
+ * The spa config locks cannot be normal rwlocks because we need the
+ * ability to hand off ownership. For example, SCL_ZIO is acquired
+ * by the issuing thread and later released by an interrupt thread.
+ * They do, however, obey the usual write-wanted semantics to prevent
+ * writer (i.e. system administrator) starvation.
+ *
+ * The lock acquisition rules are as follows:
+ *
+ * SCL_CONFIG
+ * Protects changes to the vdev tree topology, such as vdev
+ * add/remove/attach/detach. Protects the dirty config list
+ * (spa_config_dirty_list) and the set of spares and l2arc devices.
+ *
+ * SCL_STATE
+ * Protects changes to pool state and vdev state, such as vdev
+ * online/offline/fault/degrade/clear. Protects the dirty state list
+ * (spa_state_dirty_list) and global pool state (spa_state).
+ *
+ * SCL_ALLOC
+ * Protects changes to metaslab groups and classes.
+ * Held as reader by metaslab_alloc() and metaslab_claim().
+ *
+ * SCL_ZIO
+ * Held by bp-level zios (those which have no io_vd upon entry)
+ * to prevent changes to the vdev tree. The bp-level zio implicitly
+ * protects all of its vdev child zios, which do not hold SCL_ZIO.
+ *
+ * SCL_FREE
+ * Protects changes to metaslab groups and classes.
+ * Held as reader by metaslab_free(). SCL_FREE is distinct from
+ * SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
+ * blocks in zio_done() while another i/o that holds either
+ * SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
+ *
+ * SCL_VDEV
+ * Held as reader to prevent changes to the vdev tree during trivial
+ * inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
+ * other locks, and lower than all of them, to ensure that it's safe
+ * to acquire regardless of caller context.
+ *
+ * In addition, the following rules apply:
+ *
+ * (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
+ * The lock ordering is SCL_CONFIG > spa_props_lock.
+ *
+ * (b) I/O operations on leaf vdevs. For any zio operation that takes
+ * an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
+ * or zio_write_phys() -- the caller must ensure that the config cannot
+ * cannot change in the interim, and that the vdev cannot be reopened.
+ * SCL_STATE as reader suffices for both.
+ *
+ * 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.
+ *
+ * vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
+ * Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
+ * locking is, always, based on spa_namespace_lock and spa_config_lock[].
+ *
+ * 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;
+static kmutex_t spa_l2cache_lock;
+static avl_tree_t spa_l2cache_avl;
+
+kmem_cache_t *spa_buffer_pool;
+int spa_mode_global;
+
+#ifdef ZFS_DEBUG
+/* Everything except dprintf is on by default in debug builds */
+int zfs_flags = ~ZFS_DEBUG_DPRINTF;
+#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;
+
+
+/*
+ * ==========================================================================
+ * SPA config locking
+ * ==========================================================================
+ */
+static void
+spa_config_lock_init(spa_t *spa)
+{
+ for (int i = 0; i < SCL_LOCKS; i++) {
+ spa_config_lock_t *scl = &spa->spa_config_lock[i];
+ mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL);
+ cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL);
+ refcount_create(&scl->scl_count);
+ scl->scl_writer = NULL;
+ scl->scl_write_wanted = 0;
+ }
+}
+
+static void
+spa_config_lock_destroy(spa_t *spa)
+{
+ for (int i = 0; i < SCL_LOCKS; i++) {
+ spa_config_lock_t *scl = &spa->spa_config_lock[i];
+ mutex_destroy(&scl->scl_lock);
+ cv_destroy(&scl->scl_cv);
+ refcount_destroy(&scl->scl_count);
+ ASSERT(scl->scl_writer == NULL);
+ ASSERT(scl->scl_write_wanted == 0);
+ }
+}
+
+int
+spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw)
+{
+ for (int i = 0; i < SCL_LOCKS; i++) {
+ spa_config_lock_t *scl = &spa->spa_config_lock[i];
+ if (!(locks & (1 << i)))
+ continue;
+ mutex_enter(&scl->scl_lock);
+ if (rw == RW_READER) {
+ if (scl->scl_writer || scl->scl_write_wanted) {
+ mutex_exit(&scl->scl_lock);
+ spa_config_exit(spa, locks ^ (1 << i), tag);
+ return (0);
+ }
+ } else {
+ ASSERT(scl->scl_writer != curthread);
+ if (!refcount_is_zero(&scl->scl_count)) {
+ mutex_exit(&scl->scl_lock);
+ spa_config_exit(spa, locks ^ (1 << i), tag);
+ return (0);
+ }
+ scl->scl_writer = curthread;
+ }
+ (void) refcount_add(&scl->scl_count, tag);
+ mutex_exit(&scl->scl_lock);
+ }
+ return (1);
+}
+
+void
+spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw)
+{
+ int wlocks_held = 0;
+
+ for (int i = 0; i < SCL_LOCKS; i++) {
+ spa_config_lock_t *scl = &spa->spa_config_lock[i];
+ if (scl->scl_writer == curthread)
+ wlocks_held |= (1 << i);
+ if (!(locks & (1 << i)))
+ continue;
+ mutex_enter(&scl->scl_lock);
+ if (rw == RW_READER) {
+ while (scl->scl_writer || scl->scl_write_wanted) {
+ cv_wait(&scl->scl_cv, &scl->scl_lock);
+ }
+ } else {
+ ASSERT(scl->scl_writer != curthread);
+ while (!refcount_is_zero(&scl->scl_count)) {
+ scl->scl_write_wanted++;
+ cv_wait(&scl->scl_cv, &scl->scl_lock);
+ scl->scl_write_wanted--;
+ }
+ scl->scl_writer = curthread;
+ }
+ (void) refcount_add(&scl->scl_count, tag);
+ mutex_exit(&scl->scl_lock);
+ }
+ ASSERT(wlocks_held <= locks);
+}
+
+void
+spa_config_exit(spa_t *spa, int locks, void *tag)
+{
+ for (int i = SCL_LOCKS - 1; i >= 0; i--) {
+ spa_config_lock_t *scl = &spa->spa_config_lock[i];
+ if (!(locks & (1 << i)))
+ continue;
+ mutex_enter(&scl->scl_lock);
+ ASSERT(!refcount_is_zero(&scl->scl_count));
+ if (refcount_remove(&scl->scl_count, tag) == 0) {
+ ASSERT(scl->scl_writer == NULL ||
+ scl->scl_writer == curthread);
+ scl->scl_writer = NULL; /* OK in either case */
+ cv_broadcast(&scl->scl_cv);
+ }
+ mutex_exit(&scl->scl_lock);
+ }
+}
+
+int
+spa_config_held(spa_t *spa, int locks, krw_t rw)
+{
+ int locks_held = 0;
+
+ for (int i = 0; i < SCL_LOCKS; i++) {
+ spa_config_lock_t *scl = &spa->spa_config_lock[i];
+ if (!(locks & (1 << i)))
+ continue;
+ if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) ||
+ (rw == RW_WRITER && scl->scl_writer == curthread))
+ locks_held |= 1 << i;
+ }
+
+ return (locks_held);
+}
+
+/*
+ * ==========================================================================
+ * 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)
+{
+ static spa_t search; /* spa_t is large; don't allocate on stack */
+ spa_t *spa;
+ avl_index_t where;
+ char c;
+ char *cp;
+
+ ASSERT(MUTEX_HELD(&spa_namespace_lock));
+
+ /*
+ * If it's a full dataset name, figure out the pool name and
+ * just use that.
+ */
+ cp = strpbrk(name, "/@");
+ if (cp) {
+ c = *cp;
+ *cp = '\0';
+ }
+
+ (void) strlcpy(search.spa_name, name, sizeof (search.spa_name));
+ spa = avl_find(&spa_namespace_avl, &search, &where);
+
+ if (cp)
+ *cp = c;
+
+ 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, nvlist_t *config, const char *altroot)
+{
+ spa_t *spa;
+ spa_config_dirent_t *dp;
+
+ ASSERT(MUTEX_HELD(&spa_namespace_lock));
+
+ spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP);
+
+ mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL);
+
+ cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL);
+ cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL);
+ cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL);
+ cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL);
+
+ for (int t = 0; t < TXG_SIZE; t++)
+ bplist_create(&spa->spa_free_bplist[t]);
+
+ (void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name));
+ spa->spa_state = POOL_STATE_UNINITIALIZED;
+ spa->spa_freeze_txg = UINT64_MAX;
+ spa->spa_final_txg = UINT64_MAX;
+ spa->spa_load_max_txg = UINT64_MAX;
+ spa->spa_proc = &p0;
+ spa->spa_proc_state = SPA_PROC_NONE;
+
+ refcount_create(&spa->spa_refcount);
+ spa_config_lock_init(spa);
+
+ 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++;
+ }
+
+ /*
+ * Every pool starts with the default cachefile
+ */
+ list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t),
+ offsetof(spa_config_dirent_t, scd_link));
+
+ dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP);
+ dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path);
+ list_insert_head(&spa->spa_config_list, dp);
+
+ VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME,
+ KM_SLEEP) == 0);
+
+ if (config != NULL)
+ VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0);
+
+ 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)
+{
+ spa_config_dirent_t *dp;
+
+ ASSERT(MUTEX_HELD(&spa_namespace_lock));
+ ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
+
+ nvlist_free(spa->spa_config_splitting);
+
+ avl_remove(&spa_namespace_avl, spa);
+ cv_broadcast(&spa_namespace_cv);
+
+ if (spa->spa_root) {
+ spa_strfree(spa->spa_root);
+ spa_active_count--;
+ }
+
+ while ((dp = list_head(&spa->spa_config_list)) != NULL) {
+ list_remove(&spa->spa_config_list, dp);
+ if (dp->scd_path != NULL)
+ spa_strfree(dp->scd_path);
+ kmem_free(dp, sizeof (spa_config_dirent_t));
+ }
+
+ list_destroy(&spa->spa_config_list);
+
+ nvlist_free(spa->spa_load_info);
+ spa_config_set(spa, NULL);
+
+ refcount_destroy(&spa->spa_refcount);
+
+ spa_config_lock_destroy(spa);
+
+ for (int t = 0; t < TXG_SIZE; t++)
+ bplist_destroy(&spa->spa_free_bplist[t]);
+
+ cv_destroy(&spa->spa_async_cv);
+ cv_destroy(&spa->spa_proc_cv);
+ cv_destroy(&spa->spa_scrub_io_cv);
+ cv_destroy(&spa->spa_suspend_cv);
+
+ mutex_destroy(&spa->spa_async_lock);
+ mutex_destroy(&spa->spa_errlist_lock);
+ mutex_destroy(&spa->spa_errlog_lock);
+ mutex_destroy(&spa->spa_history_lock);
+ mutex_destroy(&spa->spa_proc_lock);
+ mutex_destroy(&spa->spa_props_lock);
+ mutex_destroy(&spa->spa_scrub_lock);
+ mutex_destroy(&spa->spa_suspend_lock);
+ mutex_destroy(&spa->spa_vdev_top_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->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->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->spa_minref);
+}
+
+/*
+ * ==========================================================================
+ * SPA spare and l2cache tracking
+ * ==========================================================================
+ */
+
+/*
+ * Hot spares and cache devices are tracked using the same code below,
+ * for 'auxiliary' devices.
+ */
+
+typedef struct spa_aux {
+ uint64_t aux_guid;
+ uint64_t aux_pool;
+ avl_node_t aux_avl;
+ int aux_count;
+} spa_aux_t;
+
+static int
+spa_aux_compare(const void *a, const void *b)
+{
+ const spa_aux_t *sa = a;
+ const spa_aux_t *sb = b;
+
+ if (sa->aux_guid < sb->aux_guid)
+ return (-1);
+ else if (sa->aux_guid > sb->aux_guid)
+ return (1);
+ else
+ return (0);
+}
+
+void
+spa_aux_add(vdev_t *vd, avl_tree_t *avl)
+{
+ avl_index_t where;
+ spa_aux_t search;
+ spa_aux_t *aux;
+
+ search.aux_guid = vd->vdev_guid;
+ if ((aux = avl_find(avl, &search, &where)) != NULL) {
+ aux->aux_count++;
+ } else {
+ aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP);
+ aux->aux_guid = vd->vdev_guid;
+ aux->aux_count = 1;
+ avl_insert(avl, aux, where);
+ }
+}
+
+void
+spa_aux_remove(vdev_t *vd, avl_tree_t *avl)
+{
+ spa_aux_t search;
+ spa_aux_t *aux;
+ avl_index_t where;
+
+ search.aux_guid = vd->vdev_guid;
+ aux = avl_find(avl, &search, &where);
+
+ ASSERT(aux != NULL);
+
+ if (--aux->aux_count == 0) {
+ avl_remove(avl, aux);
+ kmem_free(aux, sizeof (spa_aux_t));
+ } else if (aux->aux_pool == spa_guid(vd->vdev_spa)) {
+ aux->aux_pool = 0ULL;
+ }
+}
+
+boolean_t
+spa_aux_exists(uint64_t guid, uint64_t *pool, int *refcnt, avl_tree_t *avl)
+{
+ spa_aux_t search, *found;
+
+ search.aux_guid = guid;
+ found = avl_find(avl, &search, NULL);
+
+ if (pool) {
+ if (found)
+ *pool = found->aux_pool;
+ else
+ *pool = 0ULL;
+ }
+
+ if (refcnt) {
+ if (found)
+ *refcnt = found->aux_count;
+ else
+ *refcnt = 0;
+ }
+
+ return (found != NULL);
+}
+
+void
+spa_aux_activate(vdev_t *vd, avl_tree_t *avl)
+{
+ spa_aux_t search, *found;
+ avl_index_t where;
+
+ search.aux_guid = vd->vdev_guid;
+ found = avl_find(avl, &search, &where);
+ ASSERT(found != NULL);
+ ASSERT(found->aux_pool == 0ULL);
+
+ found->aux_pool = spa_guid(vd->vdev_spa);
+}
+
+/*
+ * 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.
+ */
+
+static int
+spa_spare_compare(const void *a, const void *b)
+{
+ return (spa_aux_compare(a, b));
+}
+
+void
+spa_spare_add(vdev_t *vd)
+{
+ mutex_enter(&spa_spare_lock);
+ ASSERT(!vd->vdev_isspare);
+ spa_aux_add(vd, &spa_spare_avl);
+ vd->vdev_isspare = B_TRUE;
+ mutex_exit(&spa_spare_lock);
+}
+
+void
+spa_spare_remove(vdev_t *vd)
+{
+ mutex_enter(&spa_spare_lock);
+ ASSERT(vd->vdev_isspare);
+ spa_aux_remove(vd, &spa_spare_avl);
+ vd->vdev_isspare = B_FALSE;
+ mutex_exit(&spa_spare_lock);
+}
+
+boolean_t
+spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt)
+{
+ boolean_t found;
+
+ mutex_enter(&spa_spare_lock);
+ found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl);
+ mutex_exit(&spa_spare_lock);
+
+ return (found);
+}
+
+void
+spa_spare_activate(vdev_t *vd)
+{
+ mutex_enter(&spa_spare_lock);
+ ASSERT(vd->vdev_isspare);
+ spa_aux_activate(vd, &spa_spare_avl);
+ mutex_exit(&spa_spare_lock);
+}
+
+/*
+ * Level 2 ARC devices are tracked globally for the same reasons as spares.
+ * Cache devices currently only support one pool per cache device, and so
+ * for these devices the aux reference count is currently unused beyond 1.
+ */
+
+static int
+spa_l2cache_compare(const void *a, const void *b)
+{
+ return (spa_aux_compare(a, b));
+}
+
+void
+spa_l2cache_add(vdev_t *vd)
+{
+ mutex_enter(&spa_l2cache_lock);
+ ASSERT(!vd->vdev_isl2cache);
+ spa_aux_add(vd, &spa_l2cache_avl);
+ vd->vdev_isl2cache = B_TRUE;
+ mutex_exit(&spa_l2cache_lock);
+}
+
+void
+spa_l2cache_remove(vdev_t *vd)
+{
+ mutex_enter(&spa_l2cache_lock);
+ ASSERT(vd->vdev_isl2cache);
+ spa_aux_remove(vd, &spa_l2cache_avl);
+ vd->vdev_isl2cache = B_FALSE;
+ mutex_exit(&spa_l2cache_lock);
+}
+
+boolean_t
+spa_l2cache_exists(uint64_t guid, uint64_t *pool)
+{
+ boolean_t found;
+
+ mutex_enter(&spa_l2cache_lock);
+ found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl);
+ mutex_exit(&spa_l2cache_lock);
+
+ return (found);
+}
+
+void
+spa_l2cache_activate(vdev_t *vd)
+{
+ mutex_enter(&spa_l2cache_lock);
+ ASSERT(vd->vdev_isl2cache);
+ spa_aux_activate(vd, &spa_l2cache_avl);
+ mutex_exit(&spa_l2cache_lock);
+}
+
+/*
+ * ==========================================================================
+ * 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)
+{
+ mutex_enter(&spa->spa_vdev_top_lock);
+ mutex_enter(&spa_namespace_lock);
+ return (spa_vdev_config_enter(spa));
+}
+
+/*
+ * Internal implementation for spa_vdev_enter(). Used when a vdev
+ * operation requires multiple syncs (i.e. removing a device) while
+ * keeping the spa_namespace_lock held.
+ */
+uint64_t
+spa_vdev_config_enter(spa_t *spa)
+{
+ ASSERT(MUTEX_HELD(&spa_namespace_lock));
+
+ spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
+
+ return (spa_last_synced_txg(spa) + 1);
+}
+
+/*
+ * Used in combination with spa_vdev_config_enter() to allow the syncing
+ * of multiple transactions without releasing the spa_namespace_lock.
+ */
+void
+spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error, char *tag)
+{
+ ASSERT(MUTEX_HELD(&spa_namespace_lock));
+
+ int config_changed = B_FALSE;
+
+ ASSERT(txg > spa_last_synced_txg(spa));
+
+ spa->spa_pending_vdev = NULL;
+
+ /*
+ * Reassess the DTLs.
+ */
+ vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE);
+
+ if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) {
+ config_changed = B_TRUE;
+ spa->spa_config_generation++;
+ }
+
+ /*
+ * Verify the metaslab classes.
+ */
+ ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0);
+ ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0);
+
+ spa_config_exit(spa, SCL_ALL, spa);
+
+ /*
+ * Panic the system if the specified tag requires it. This
+ * is useful for ensuring that configurations are updated
+ * transactionally.
+ */
+ if (zio_injection_enabled)
+ zio_handle_panic_injection(spa, tag, 0);
+
+ /*
+ * 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.smo_object == 0);
+ spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);
+ vdev_free(vd);
+ spa_config_exit(spa, SCL_ALL, spa);
+ }
+
+ /*
+ * If the config changed, update the config cache.
+ */
+ if (config_changed)
+ spa_config_sync(spa, B_FALSE, B_TRUE);
+}
+
+/*
+ * 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)
+{
+ spa_vdev_config_exit(spa, vd, txg, error, FTAG);
+ mutex_exit(&spa_namespace_lock);
+ mutex_exit(&spa->spa_vdev_top_lock);
+
+ return (error);
+}
+
+/*
+ * Lock the given spa_t for the purpose of changing vdev state.
+ */
+void
+spa_vdev_state_enter(spa_t *spa, int oplocks)
+{
+ int locks = SCL_STATE_ALL | oplocks;
+
+ /*
+ * Root pools may need to read of the underlying devfs filesystem
+ * when opening up a vdev. Unfortunately if we're holding the
+ * SCL_ZIO lock it will result in a deadlock when we try to issue
+ * the read from the root filesystem. Instead we "prefetch"
+ * the associated vnodes that we need prior to opening the
+ * underlying devices and cache them so that we can prevent
+ * any I/O when we are doing the actual open.
+ */
+ if (spa_is_root(spa)) {
+ int low = locks & ~(SCL_ZIO - 1);
+ int high = locks & ~low;
+
+ spa_config_enter(spa, high, spa, RW_WRITER);
+ vdev_hold(spa->spa_root_vdev);
+ spa_config_enter(spa, low, spa, RW_WRITER);
+ } else {
+ spa_config_enter(spa, locks, spa, RW_WRITER);
+ }
+ spa->spa_vdev_locks = locks;
+}
+
+int
+spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error)
+{
+ boolean_t config_changed = B_FALSE;
+
+ if (vd != NULL || error == 0)
+ vdev_dtl_reassess(vd ? vd->vdev_top : spa->spa_root_vdev,
+ 0, 0, B_FALSE);
+
+ if (vd != NULL) {
+ vdev_state_dirty(vd->vdev_top);
+ config_changed = B_TRUE;
+ spa->spa_config_generation++;
+ }
+
+ if (spa_is_root(spa))
+ vdev_rele(spa->spa_root_vdev);
+
+ ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL);
+ spa_config_exit(spa, spa->spa_vdev_locks, spa);
+
+ /*
+ * If anything changed, wait for it to sync. This ensures that,
+ * from the system administrator's perspective, zpool(1M) commands
+ * are synchronous. This is important for things like zpool offline:
+ * when the command completes, you expect no further I/O from ZFS.
+ */
+ if (vd != NULL)
+ txg_wait_synced(spa->spa_dsl_pool, 0);
+
+ /*
+ * If the config changed, update the config cache.
+ */
+ if (config_changed) {
+ mutex_enter(&spa_namespace_lock);
+ spa_config_sync(spa, B_FALSE, B_TRUE);
+ 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, SCL_ALL, FTAG, RW_WRITER);
+
+ avl_remove(&spa_namespace_avl, spa);
+ (void) strlcpy(spa->spa_name, newname, sizeof (spa->spa_name));
+ 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, SCL_ALL, FTAG);
+
+ txg_wait_synced(spa->spa_dsl_pool, 0);
+
+ /*
+ * Sync the updated config cache.
+ */
+ spa_config_sync(spa, B_FALSE, B_TRUE);
+
+ spa_close(spa, FTAG);
+
+ mutex_exit(&spa_namespace_lock);
+
+ return (0);
+}
+
+/*
+ * Return the spa_t associated with given pool_guid, if it exists. If
+ * device_guid is non-zero, determine whether the pool exists *and* contains
+ * a device with the specified device_guid.
+ */
+spa_t *
+spa_by_guid(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 be 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);
+}
+
+/*
+ * Determine whether a pool with the given pool_guid exists.
+ */
+boolean_t
+spa_guid_exists(uint64_t pool_guid, uint64_t device_guid)
+{
+ return (spa_by_guid(pool_guid, device_guid) != 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);
+}
+
+uint64_t
+spa_generate_guid(spa_t *spa)
+{
+ uint64_t guid = spa_get_random(-1ULL);
+
+ if (spa != NULL) {
+ while (guid == 0 || spa_guid_exists(spa_guid(spa), guid))
+ guid = spa_get_random(-1ULL);
+ } else {
+ while (guid == 0 || spa_guid_exists(guid, 0))
+ guid = spa_get_random(-1ULL);
+ }
+
+ return (guid);
+}
+
+void
+sprintf_blkptr(char *buf, const blkptr_t *bp)
+{
+ char *type = NULL;
+ char *checksum = NULL;
+ char *compress = NULL;
+
+ if (bp != NULL) {
+ type = dmu_ot[BP_GET_TYPE(bp)].ot_name;
+ checksum = zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name;
+ compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name;
+ }
+
+ SPRINTF_BLKPTR(snprintf, ' ', buf, bp, type, checksum, compress);
+}
+
+void
+spa_freeze(spa_t *spa)
+{
+ uint64_t freeze_txg = 0;
+
+ spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
+ 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, SCL_ALL, 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);
+}
+
+/*
+ * This is a stripped-down version of strtoull, suitable only for converting
+ * lowercase hexidecimal numbers that don't overflow.
+ */
+uint64_t
+strtonum(const char *str, char **nptr)
+{
+ uint64_t val = 0;
+ char c;
+ int digit;
+
+ while ((c = *str) != '\0') {
+ if (c >= '0' && c <= '9')
+ digit = c - '0';
+ else if (c >= 'a' && c <= 'f')
+ digit = 10 + c - 'a';
+ else
+ break;
+
+ val *= 16;
+ val += digit;
+
+ str++;
+ }
+
+ if (nptr)
+ *nptr = (char *)str;
+
+ return (val);
+}
+
+/*
+ * ==========================================================================
+ * Accessor functions
+ * ==========================================================================
+ */
+
+boolean_t
+spa_shutting_down(spa_t *spa)
+{
+ return (spa->spa_async_suspended);
+}
+
+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)
+{
+ 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);
+}
+
+uint64_t
+spa_syncing_txg(spa_t *spa)
+{
+ return (spa->spa_syncing_txg);
+}
+
+pool_state_t
+spa_state(spa_t *spa)
+{
+ return (spa->spa_state);
+}
+
+spa_load_state_t
+spa_load_state(spa_t *spa)
+{
+ return (spa->spa_load_state);
+}
+
+uint64_t
+spa_freeze_txg(spa_t *spa)
+{
+ return (spa->spa_freeze_txg);
+}
+
+/* ARGSUSED */
+uint64_t
+spa_get_asize(spa_t *spa, uint64_t lsize)
+{
+ /*
+ * The worst case is single-sector max-parity RAID-Z blocks, in which
+ * case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
+ * times the size; so just assume that. Add to this the fact that
+ * we can have up to 3 DVAs per bp, and one more factor of 2 because
+ * the block may be dittoed with up to 3 DVAs by ddt_sync().
+ */
+ return (lsize * (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2);
+}
+
+uint64_t
+spa_get_dspace(spa_t *spa)
+{
+ return (spa->spa_dspace);
+}
+
+void
+spa_update_dspace(spa_t *spa)
+{
+ spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) +
+ ddt_get_dedup_dspace(spa);
+}
+
+/*
+ * Return the failure mode that has been set to this pool. The default
+ * behavior will be to block all I/Os when a complete failure occurs.
+ */
+uint8_t
+spa_get_failmode(spa_t *spa)
+{
+ return (spa->spa_failmode);
+}
+
+boolean_t
+spa_suspended(spa_t *spa)
+{
+ return (spa->spa_suspended);
+}
+
+uint64_t
+spa_version(spa_t *spa)
+{
+ return (spa->spa_ubsync.ub_version);
+}
+
+boolean_t
+spa_deflate(spa_t *spa)
+{
+ return (spa->spa_deflate);
+}
+
+metaslab_class_t *
+spa_normal_class(spa_t *spa)
+{
+ return (spa->spa_normal_class);
+}
+
+metaslab_class_t *
+spa_log_class(spa_t *spa)
+{
+ return (spa->spa_log_class);
+}
+
+int
+spa_max_replication(spa_t *spa)
+{
+ /*
+ * As of SPA_VERSION == SPA_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) < SPA_VERSION_DITTO_BLOCKS)
+ return (1);
+ return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override));
+}
+
+int
+spa_prev_software_version(spa_t *spa)
+{
+ return (spa->spa_prev_software_version);
+}
+
+uint64_t
+dva_get_dsize_sync(spa_t *spa, const dva_t *dva)
+{
+ uint64_t asize = DVA_GET_ASIZE(dva);
+ uint64_t dsize = asize;
+
+ ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
+
+ if (asize != 0 && spa->spa_deflate) {
+ vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));
+ dsize = (asize >> SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio;
+ }
+
+ return (dsize);
+}
+
+uint64_t
+bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp)
+{
+ uint64_t dsize = 0;
+
+ for (int d = 0; d < SPA_DVAS_PER_BP; d++)
+ dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
+
+ return (dsize);
+}
+
+uint64_t
+bp_get_dsize(spa_t *spa, const blkptr_t *bp)
+{
+ uint64_t dsize = 0;
+
+ spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
+
+ for (int d = 0; d < SPA_DVAS_PER_BP; d++)
+ dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);
+
+ spa_config_exit(spa, SCL_VDEV, FTAG);
+
+ return (dsize);
+}
+
+/*
+ * ==========================================================================
+ * 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_boot_init()
+{
+ spa_config_load();
+}
+
+void
+spa_init(int mode)
+{
+ mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&spa_l2cache_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));
+
+ avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t),
+ offsetof(spa_aux_t, aux_avl));
+
+ avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t),
+ offsetof(spa_aux_t, aux_avl));
+
+ spa_mode_global = mode;
+
+ refcount_init();
+ unique_init();
+ zio_init();
+ dmu_init();
+ zil_init();
+ vdev_cache_stat_init();
+ zfs_prop_init();
+ zpool_prop_init();
+ spa_config_load();
+ l2arc_start();
+}
+
+void
+spa_fini(void)
+{
+ l2arc_stop();
+
+ spa_evict_all();
+
+ vdev_cache_stat_fini();
+ zil_fini();
+ dmu_fini();
+ zio_fini();
+ unique_fini();
+ refcount_fini();
+
+ avl_destroy(&spa_namespace_avl);
+ avl_destroy(&spa_spare_avl);
+ avl_destroy(&spa_l2cache_avl);
+
+ cv_destroy(&spa_namespace_cv);
+ mutex_destroy(&spa_namespace_lock);
+ mutex_destroy(&spa_spare_lock);
+ mutex_destroy(&spa_l2cache_lock);
+}
+
+/*
+ * Return whether this pool has slogs. No locking needed.
+ * It's not a problem if the wrong answer is returned as it's only for
+ * performance and not correctness
+ */
+boolean_t
+spa_has_slogs(spa_t *spa)
+{
+ return (spa->spa_log_class->mc_rotor != NULL);
+}
+
+spa_log_state_t
+spa_get_log_state(spa_t *spa)
+{
+ return (spa->spa_log_state);
+}
+
+void
+spa_set_log_state(spa_t *spa, spa_log_state_t state)
+{
+ spa->spa_log_state = state;
+}
+
+boolean_t
+spa_is_root(spa_t *spa)
+{
+ return (spa->spa_is_root);
+}
+
+boolean_t
+spa_writeable(spa_t *spa)
+{
+ return (!!(spa->spa_mode & FWRITE));
+}
+
+int
+spa_mode(spa_t *spa)
+{
+ return (spa->spa_mode);
+}
+
+uint64_t
+spa_bootfs(spa_t *spa)
+{
+ return (spa->spa_bootfs);
+}
+
+uint64_t
+spa_delegation(spa_t *spa)
+{
+ return (spa->spa_delegation);
+}
+
+objset_t *
+spa_meta_objset(spa_t *spa)
+{
+ return (spa->spa_meta_objset);
+}
+
+enum zio_checksum
+spa_dedup_checksum(spa_t *spa)
+{
+ return (spa->spa_dedup_checksum);
+}
+
+/*
+ * Reset pool scan stat per scan pass (or reboot).
+ */
+void
+spa_scan_stat_init(spa_t *spa)
+{
+ /* data not stored on disk */
+ spa->spa_scan_pass_start = gethrestime_sec();
+ spa->spa_scan_pass_exam = 0;
+ vdev_scan_stat_init(spa->spa_root_vdev);
+}
+
+/*
+ * Get scan stats for zpool status reports
+ */
+int
+spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps)
+{
+ dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL;
+
+ if (scn == NULL || scn->scn_phys.scn_func == POOL_SCAN_NONE)
+ return (ENOENT);
+ bzero(ps, sizeof (pool_scan_stat_t));
+
+ /* data stored on disk */
+ ps->pss_func = scn->scn_phys.scn_func;
+ ps->pss_start_time = scn->scn_phys.scn_start_time;
+ ps->pss_end_time = scn->scn_phys.scn_end_time;
+ ps->pss_to_examine = scn->scn_phys.scn_to_examine;
+ ps->pss_examined = scn->scn_phys.scn_examined;
+ ps->pss_to_process = scn->scn_phys.scn_to_process;
+ ps->pss_processed = scn->scn_phys.scn_processed;
+ ps->pss_errors = scn->scn_phys.scn_errors;
+ ps->pss_state = scn->scn_phys.scn_state;
+
+ /* data not stored on disk */
+ ps->pss_pass_start = spa->spa_scan_pass_start;
+ ps->pss_pass_exam = spa->spa_scan_pass_exam;
+
+ return (0);
+}