aboutsummaryrefslogtreecommitdiffstats
path: root/uts/common/fs/zfs/vdev.c
diff options
context:
space:
mode:
Diffstat (limited to 'uts/common/fs/zfs/vdev.c')
-rw-r--r--uts/common/fs/zfs/vdev.c3130
1 files changed, 3130 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/vdev.c b/uts/common/fs/zfs/vdev.c
new file mode 100644
index 000000000000..bac3e86054d6
--- /dev/null
+++ b/uts/common/fs/zfs/vdev.c
@@ -0,0 +1,3130 @@
+/*
+ * 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/fm/fs/zfs.h>
+#include <sys/spa.h>
+#include <sys/spa_impl.h>
+#include <sys/dmu.h>
+#include <sys/dmu_tx.h>
+#include <sys/vdev_impl.h>
+#include <sys/uberblock_impl.h>
+#include <sys/metaslab.h>
+#include <sys/metaslab_impl.h>
+#include <sys/space_map.h>
+#include <sys/zio.h>
+#include <sys/zap.h>
+#include <sys/fs/zfs.h>
+#include <sys/arc.h>
+#include <sys/zil.h>
+#include <sys/dsl_scan.h>
+
+/*
+ * Virtual device management.
+ */
+
+static vdev_ops_t *vdev_ops_table[] = {
+ &vdev_root_ops,
+ &vdev_raidz_ops,
+ &vdev_mirror_ops,
+ &vdev_replacing_ops,
+ &vdev_spare_ops,
+ &vdev_disk_ops,
+ &vdev_file_ops,
+ &vdev_missing_ops,
+ &vdev_hole_ops,
+ NULL
+};
+
+/* maximum scrub/resilver I/O queue per leaf vdev */
+int zfs_scrub_limit = 10;
+
+/*
+ * Given a vdev type, return the appropriate ops vector.
+ */
+static vdev_ops_t *
+vdev_getops(const char *type)
+{
+ vdev_ops_t *ops, **opspp;
+
+ for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++)
+ if (strcmp(ops->vdev_op_type, type) == 0)
+ break;
+
+ return (ops);
+}
+
+/*
+ * Default asize function: return the MAX of psize with the asize of
+ * all children. This is what's used by anything other than RAID-Z.
+ */
+uint64_t
+vdev_default_asize(vdev_t *vd, uint64_t psize)
+{
+ uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift);
+ uint64_t csize;
+
+ for (int c = 0; c < vd->vdev_children; c++) {
+ csize = vdev_psize_to_asize(vd->vdev_child[c], psize);
+ asize = MAX(asize, csize);
+ }
+
+ return (asize);
+}
+
+/*
+ * Get the minimum allocatable size. We define the allocatable size as
+ * the vdev's asize rounded to the nearest metaslab. This allows us to
+ * replace or attach devices which don't have the same physical size but
+ * can still satisfy the same number of allocations.
+ */
+uint64_t
+vdev_get_min_asize(vdev_t *vd)
+{
+ vdev_t *pvd = vd->vdev_parent;
+
+ /*
+ * The our parent is NULL (inactive spare or cache) or is the root,
+ * just return our own asize.
+ */
+ if (pvd == NULL)
+ return (vd->vdev_asize);
+
+ /*
+ * The top-level vdev just returns the allocatable size rounded
+ * to the nearest metaslab.
+ */
+ if (vd == vd->vdev_top)
+ return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift));
+
+ /*
+ * The allocatable space for a raidz vdev is N * sizeof(smallest child),
+ * so each child must provide at least 1/Nth of its asize.
+ */
+ if (pvd->vdev_ops == &vdev_raidz_ops)
+ return (pvd->vdev_min_asize / pvd->vdev_children);
+
+ return (pvd->vdev_min_asize);
+}
+
+void
+vdev_set_min_asize(vdev_t *vd)
+{
+ vd->vdev_min_asize = vdev_get_min_asize(vd);
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_set_min_asize(vd->vdev_child[c]);
+}
+
+vdev_t *
+vdev_lookup_top(spa_t *spa, uint64_t vdev)
+{
+ vdev_t *rvd = spa->spa_root_vdev;
+
+ ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
+
+ if (vdev < rvd->vdev_children) {
+ ASSERT(rvd->vdev_child[vdev] != NULL);
+ return (rvd->vdev_child[vdev]);
+ }
+
+ return (NULL);
+}
+
+vdev_t *
+vdev_lookup_by_guid(vdev_t *vd, uint64_t guid)
+{
+ vdev_t *mvd;
+
+ if (vd->vdev_guid == guid)
+ return (vd);
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) !=
+ NULL)
+ return (mvd);
+
+ return (NULL);
+}
+
+void
+vdev_add_child(vdev_t *pvd, vdev_t *cvd)
+{
+ size_t oldsize, newsize;
+ uint64_t id = cvd->vdev_id;
+ vdev_t **newchild;
+
+ ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
+ ASSERT(cvd->vdev_parent == NULL);
+
+ cvd->vdev_parent = pvd;
+
+ if (pvd == NULL)
+ return;
+
+ ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL);
+
+ oldsize = pvd->vdev_children * sizeof (vdev_t *);
+ pvd->vdev_children = MAX(pvd->vdev_children, id + 1);
+ newsize = pvd->vdev_children * sizeof (vdev_t *);
+
+ newchild = kmem_zalloc(newsize, KM_SLEEP);
+ if (pvd->vdev_child != NULL) {
+ bcopy(pvd->vdev_child, newchild, oldsize);
+ kmem_free(pvd->vdev_child, oldsize);
+ }
+
+ pvd->vdev_child = newchild;
+ pvd->vdev_child[id] = cvd;
+
+ cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd);
+ ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL);
+
+ /*
+ * Walk up all ancestors to update guid sum.
+ */
+ for (; pvd != NULL; pvd = pvd->vdev_parent)
+ pvd->vdev_guid_sum += cvd->vdev_guid_sum;
+}
+
+void
+vdev_remove_child(vdev_t *pvd, vdev_t *cvd)
+{
+ int c;
+ uint_t id = cvd->vdev_id;
+
+ ASSERT(cvd->vdev_parent == pvd);
+
+ if (pvd == NULL)
+ return;
+
+ ASSERT(id < pvd->vdev_children);
+ ASSERT(pvd->vdev_child[id] == cvd);
+
+ pvd->vdev_child[id] = NULL;
+ cvd->vdev_parent = NULL;
+
+ for (c = 0; c < pvd->vdev_children; c++)
+ if (pvd->vdev_child[c])
+ break;
+
+ if (c == pvd->vdev_children) {
+ kmem_free(pvd->vdev_child, c * sizeof (vdev_t *));
+ pvd->vdev_child = NULL;
+ pvd->vdev_children = 0;
+ }
+
+ /*
+ * Walk up all ancestors to update guid sum.
+ */
+ for (; pvd != NULL; pvd = pvd->vdev_parent)
+ pvd->vdev_guid_sum -= cvd->vdev_guid_sum;
+}
+
+/*
+ * Remove any holes in the child array.
+ */
+void
+vdev_compact_children(vdev_t *pvd)
+{
+ vdev_t **newchild, *cvd;
+ int oldc = pvd->vdev_children;
+ int newc;
+
+ ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
+
+ for (int c = newc = 0; c < oldc; c++)
+ if (pvd->vdev_child[c])
+ newc++;
+
+ newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP);
+
+ for (int c = newc = 0; c < oldc; c++) {
+ if ((cvd = pvd->vdev_child[c]) != NULL) {
+ newchild[newc] = cvd;
+ cvd->vdev_id = newc++;
+ }
+ }
+
+ kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *));
+ pvd->vdev_child = newchild;
+ pvd->vdev_children = newc;
+}
+
+/*
+ * Allocate and minimally initialize a vdev_t.
+ */
+vdev_t *
+vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops)
+{
+ vdev_t *vd;
+
+ vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP);
+
+ if (spa->spa_root_vdev == NULL) {
+ ASSERT(ops == &vdev_root_ops);
+ spa->spa_root_vdev = vd;
+ }
+
+ if (guid == 0 && ops != &vdev_hole_ops) {
+ if (spa->spa_root_vdev == vd) {
+ /*
+ * The root vdev's guid will also be the pool guid,
+ * which must be unique among all pools.
+ */
+ guid = spa_generate_guid(NULL);
+ } else {
+ /*
+ * Any other vdev's guid must be unique within the pool.
+ */
+ guid = spa_generate_guid(spa);
+ }
+ ASSERT(!spa_guid_exists(spa_guid(spa), guid));
+ }
+
+ vd->vdev_spa = spa;
+ vd->vdev_id = id;
+ vd->vdev_guid = guid;
+ vd->vdev_guid_sum = guid;
+ vd->vdev_ops = ops;
+ vd->vdev_state = VDEV_STATE_CLOSED;
+ vd->vdev_ishole = (ops == &vdev_hole_ops);
+
+ mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL);
+ for (int t = 0; t < DTL_TYPES; t++) {
+ space_map_create(&vd->vdev_dtl[t], 0, -1ULL, 0,
+ &vd->vdev_dtl_lock);
+ }
+ txg_list_create(&vd->vdev_ms_list,
+ offsetof(struct metaslab, ms_txg_node));
+ txg_list_create(&vd->vdev_dtl_list,
+ offsetof(struct vdev, vdev_dtl_node));
+ vd->vdev_stat.vs_timestamp = gethrtime();
+ vdev_queue_init(vd);
+ vdev_cache_init(vd);
+
+ return (vd);
+}
+
+/*
+ * Allocate a new vdev. The 'alloctype' is used to control whether we are
+ * creating a new vdev or loading an existing one - the behavior is slightly
+ * different for each case.
+ */
+int
+vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id,
+ int alloctype)
+{
+ vdev_ops_t *ops;
+ char *type;
+ uint64_t guid = 0, islog, nparity;
+ vdev_t *vd;
+
+ ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
+
+ if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0)
+ return (EINVAL);
+
+ if ((ops = vdev_getops(type)) == NULL)
+ return (EINVAL);
+
+ /*
+ * If this is a load, get the vdev guid from the nvlist.
+ * Otherwise, vdev_alloc_common() will generate one for us.
+ */
+ if (alloctype == VDEV_ALLOC_LOAD) {
+ uint64_t label_id;
+
+ if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) ||
+ label_id != id)
+ return (EINVAL);
+
+ if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
+ return (EINVAL);
+ } else if (alloctype == VDEV_ALLOC_SPARE) {
+ if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
+ return (EINVAL);
+ } else if (alloctype == VDEV_ALLOC_L2CACHE) {
+ if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
+ return (EINVAL);
+ } else if (alloctype == VDEV_ALLOC_ROOTPOOL) {
+ if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
+ return (EINVAL);
+ }
+
+ /*
+ * The first allocated vdev must be of type 'root'.
+ */
+ if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL)
+ return (EINVAL);
+
+ /*
+ * Determine whether we're a log vdev.
+ */
+ islog = 0;
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog);
+ if (islog && spa_version(spa) < SPA_VERSION_SLOGS)
+ return (ENOTSUP);
+
+ if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES)
+ return (ENOTSUP);
+
+ /*
+ * Set the nparity property for RAID-Z vdevs.
+ */
+ nparity = -1ULL;
+ if (ops == &vdev_raidz_ops) {
+ if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY,
+ &nparity) == 0) {
+ if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY)
+ return (EINVAL);
+ /*
+ * Previous versions could only support 1 or 2 parity
+ * device.
+ */
+ if (nparity > 1 &&
+ spa_version(spa) < SPA_VERSION_RAIDZ2)
+ return (ENOTSUP);
+ if (nparity > 2 &&
+ spa_version(spa) < SPA_VERSION_RAIDZ3)
+ return (ENOTSUP);
+ } else {
+ /*
+ * We require the parity to be specified for SPAs that
+ * support multiple parity levels.
+ */
+ if (spa_version(spa) >= SPA_VERSION_RAIDZ2)
+ return (EINVAL);
+ /*
+ * Otherwise, we default to 1 parity device for RAID-Z.
+ */
+ nparity = 1;
+ }
+ } else {
+ nparity = 0;
+ }
+ ASSERT(nparity != -1ULL);
+
+ vd = vdev_alloc_common(spa, id, guid, ops);
+
+ vd->vdev_islog = islog;
+ vd->vdev_nparity = nparity;
+
+ if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0)
+ vd->vdev_path = spa_strdup(vd->vdev_path);
+ if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0)
+ vd->vdev_devid = spa_strdup(vd->vdev_devid);
+ if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH,
+ &vd->vdev_physpath) == 0)
+ vd->vdev_physpath = spa_strdup(vd->vdev_physpath);
+ if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0)
+ vd->vdev_fru = spa_strdup(vd->vdev_fru);
+
+ /*
+ * Set the whole_disk property. If it's not specified, leave the value
+ * as -1.
+ */
+ if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
+ &vd->vdev_wholedisk) != 0)
+ vd->vdev_wholedisk = -1ULL;
+
+ /*
+ * Look for the 'not present' flag. This will only be set if the device
+ * was not present at the time of import.
+ */
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
+ &vd->vdev_not_present);
+
+ /*
+ * Get the alignment requirement.
+ */
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift);
+
+ /*
+ * Retrieve the vdev creation time.
+ */
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG,
+ &vd->vdev_crtxg);
+
+ /*
+ * If we're a top-level vdev, try to load the allocation parameters.
+ */
+ if (parent && !parent->vdev_parent &&
+ (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) {
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY,
+ &vd->vdev_ms_array);
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT,
+ &vd->vdev_ms_shift);
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE,
+ &vd->vdev_asize);
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING,
+ &vd->vdev_removing);
+ }
+
+ if (parent && !parent->vdev_parent) {
+ ASSERT(alloctype == VDEV_ALLOC_LOAD ||
+ alloctype == VDEV_ALLOC_ADD ||
+ alloctype == VDEV_ALLOC_SPLIT ||
+ alloctype == VDEV_ALLOC_ROOTPOOL);
+ vd->vdev_mg = metaslab_group_create(islog ?
+ spa_log_class(spa) : spa_normal_class(spa), vd);
+ }
+
+ /*
+ * If we're a leaf vdev, try to load the DTL object and other state.
+ */
+ if (vd->vdev_ops->vdev_op_leaf &&
+ (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE ||
+ alloctype == VDEV_ALLOC_ROOTPOOL)) {
+ if (alloctype == VDEV_ALLOC_LOAD) {
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL,
+ &vd->vdev_dtl_smo.smo_object);
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE,
+ &vd->vdev_unspare);
+ }
+
+ if (alloctype == VDEV_ALLOC_ROOTPOOL) {
+ uint64_t spare = 0;
+
+ if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE,
+ &spare) == 0 && spare)
+ spa_spare_add(vd);
+ }
+
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE,
+ &vd->vdev_offline);
+
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVERING,
+ &vd->vdev_resilvering);
+
+ /*
+ * When importing a pool, we want to ignore the persistent fault
+ * state, as the diagnosis made on another system may not be
+ * valid in the current context. Local vdevs will
+ * remain in the faulted state.
+ */
+ if (spa_load_state(spa) == SPA_LOAD_OPEN) {
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED,
+ &vd->vdev_faulted);
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED,
+ &vd->vdev_degraded);
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED,
+ &vd->vdev_removed);
+
+ if (vd->vdev_faulted || vd->vdev_degraded) {
+ char *aux;
+
+ vd->vdev_label_aux =
+ VDEV_AUX_ERR_EXCEEDED;
+ if (nvlist_lookup_string(nv,
+ ZPOOL_CONFIG_AUX_STATE, &aux) == 0 &&
+ strcmp(aux, "external") == 0)
+ vd->vdev_label_aux = VDEV_AUX_EXTERNAL;
+ }
+ }
+ }
+
+ /*
+ * Add ourselves to the parent's list of children.
+ */
+ vdev_add_child(parent, vd);
+
+ *vdp = vd;
+
+ return (0);
+}
+
+void
+vdev_free(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+
+ /*
+ * vdev_free() implies closing the vdev first. This is simpler than
+ * trying to ensure complicated semantics for all callers.
+ */
+ vdev_close(vd);
+
+ ASSERT(!list_link_active(&vd->vdev_config_dirty_node));
+ ASSERT(!list_link_active(&vd->vdev_state_dirty_node));
+
+ /*
+ * Free all children.
+ */
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_free(vd->vdev_child[c]);
+
+ ASSERT(vd->vdev_child == NULL);
+ ASSERT(vd->vdev_guid_sum == vd->vdev_guid);
+
+ /*
+ * Discard allocation state.
+ */
+ if (vd->vdev_mg != NULL) {
+ vdev_metaslab_fini(vd);
+ metaslab_group_destroy(vd->vdev_mg);
+ }
+
+ ASSERT3U(vd->vdev_stat.vs_space, ==, 0);
+ ASSERT3U(vd->vdev_stat.vs_dspace, ==, 0);
+ ASSERT3U(vd->vdev_stat.vs_alloc, ==, 0);
+
+ /*
+ * Remove this vdev from its parent's child list.
+ */
+ vdev_remove_child(vd->vdev_parent, vd);
+
+ ASSERT(vd->vdev_parent == NULL);
+
+ /*
+ * Clean up vdev structure.
+ */
+ vdev_queue_fini(vd);
+ vdev_cache_fini(vd);
+
+ if (vd->vdev_path)
+ spa_strfree(vd->vdev_path);
+ if (vd->vdev_devid)
+ spa_strfree(vd->vdev_devid);
+ if (vd->vdev_physpath)
+ spa_strfree(vd->vdev_physpath);
+ if (vd->vdev_fru)
+ spa_strfree(vd->vdev_fru);
+
+ if (vd->vdev_isspare)
+ spa_spare_remove(vd);
+ if (vd->vdev_isl2cache)
+ spa_l2cache_remove(vd);
+
+ txg_list_destroy(&vd->vdev_ms_list);
+ txg_list_destroy(&vd->vdev_dtl_list);
+
+ mutex_enter(&vd->vdev_dtl_lock);
+ for (int t = 0; t < DTL_TYPES; t++) {
+ space_map_unload(&vd->vdev_dtl[t]);
+ space_map_destroy(&vd->vdev_dtl[t]);
+ }
+ mutex_exit(&vd->vdev_dtl_lock);
+
+ mutex_destroy(&vd->vdev_dtl_lock);
+ mutex_destroy(&vd->vdev_stat_lock);
+ mutex_destroy(&vd->vdev_probe_lock);
+
+ if (vd == spa->spa_root_vdev)
+ spa->spa_root_vdev = NULL;
+
+ kmem_free(vd, sizeof (vdev_t));
+}
+
+/*
+ * Transfer top-level vdev state from svd to tvd.
+ */
+static void
+vdev_top_transfer(vdev_t *svd, vdev_t *tvd)
+{
+ spa_t *spa = svd->vdev_spa;
+ metaslab_t *msp;
+ vdev_t *vd;
+ int t;
+
+ ASSERT(tvd == tvd->vdev_top);
+
+ tvd->vdev_ms_array = svd->vdev_ms_array;
+ tvd->vdev_ms_shift = svd->vdev_ms_shift;
+ tvd->vdev_ms_count = svd->vdev_ms_count;
+
+ svd->vdev_ms_array = 0;
+ svd->vdev_ms_shift = 0;
+ svd->vdev_ms_count = 0;
+
+ tvd->vdev_mg = svd->vdev_mg;
+ tvd->vdev_ms = svd->vdev_ms;
+
+ svd->vdev_mg = NULL;
+ svd->vdev_ms = NULL;
+
+ if (tvd->vdev_mg != NULL)
+ tvd->vdev_mg->mg_vd = tvd;
+
+ tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc;
+ tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space;
+ tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace;
+
+ svd->vdev_stat.vs_alloc = 0;
+ svd->vdev_stat.vs_space = 0;
+ svd->vdev_stat.vs_dspace = 0;
+
+ for (t = 0; t < TXG_SIZE; t++) {
+ while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL)
+ (void) txg_list_add(&tvd->vdev_ms_list, msp, t);
+ while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL)
+ (void) txg_list_add(&tvd->vdev_dtl_list, vd, t);
+ if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t))
+ (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t);
+ }
+
+ if (list_link_active(&svd->vdev_config_dirty_node)) {
+ vdev_config_clean(svd);
+ vdev_config_dirty(tvd);
+ }
+
+ if (list_link_active(&svd->vdev_state_dirty_node)) {
+ vdev_state_clean(svd);
+ vdev_state_dirty(tvd);
+ }
+
+ tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio;
+ svd->vdev_deflate_ratio = 0;
+
+ tvd->vdev_islog = svd->vdev_islog;
+ svd->vdev_islog = 0;
+}
+
+static void
+vdev_top_update(vdev_t *tvd, vdev_t *vd)
+{
+ if (vd == NULL)
+ return;
+
+ vd->vdev_top = tvd;
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_top_update(tvd, vd->vdev_child[c]);
+}
+
+/*
+ * Add a mirror/replacing vdev above an existing vdev.
+ */
+vdev_t *
+vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops)
+{
+ spa_t *spa = cvd->vdev_spa;
+ vdev_t *pvd = cvd->vdev_parent;
+ vdev_t *mvd;
+
+ ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
+
+ mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops);
+
+ mvd->vdev_asize = cvd->vdev_asize;
+ mvd->vdev_min_asize = cvd->vdev_min_asize;
+ mvd->vdev_ashift = cvd->vdev_ashift;
+ mvd->vdev_state = cvd->vdev_state;
+ mvd->vdev_crtxg = cvd->vdev_crtxg;
+
+ vdev_remove_child(pvd, cvd);
+ vdev_add_child(pvd, mvd);
+ cvd->vdev_id = mvd->vdev_children;
+ vdev_add_child(mvd, cvd);
+ vdev_top_update(cvd->vdev_top, cvd->vdev_top);
+
+ if (mvd == mvd->vdev_top)
+ vdev_top_transfer(cvd, mvd);
+
+ return (mvd);
+}
+
+/*
+ * Remove a 1-way mirror/replacing vdev from the tree.
+ */
+void
+vdev_remove_parent(vdev_t *cvd)
+{
+ vdev_t *mvd = cvd->vdev_parent;
+ vdev_t *pvd = mvd->vdev_parent;
+
+ ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
+
+ ASSERT(mvd->vdev_children == 1);
+ ASSERT(mvd->vdev_ops == &vdev_mirror_ops ||
+ mvd->vdev_ops == &vdev_replacing_ops ||
+ mvd->vdev_ops == &vdev_spare_ops);
+ cvd->vdev_ashift = mvd->vdev_ashift;
+
+ vdev_remove_child(mvd, cvd);
+ vdev_remove_child(pvd, mvd);
+
+ /*
+ * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
+ * Otherwise, we could have detached an offline device, and when we
+ * go to import the pool we'll think we have two top-level vdevs,
+ * instead of a different version of the same top-level vdev.
+ */
+ if (mvd->vdev_top == mvd) {
+ uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid;
+ cvd->vdev_orig_guid = cvd->vdev_guid;
+ cvd->vdev_guid += guid_delta;
+ cvd->vdev_guid_sum += guid_delta;
+ }
+ cvd->vdev_id = mvd->vdev_id;
+ vdev_add_child(pvd, cvd);
+ vdev_top_update(cvd->vdev_top, cvd->vdev_top);
+
+ if (cvd == cvd->vdev_top)
+ vdev_top_transfer(mvd, cvd);
+
+ ASSERT(mvd->vdev_children == 0);
+ vdev_free(mvd);
+}
+
+int
+vdev_metaslab_init(vdev_t *vd, uint64_t txg)
+{
+ spa_t *spa = vd->vdev_spa;
+ objset_t *mos = spa->spa_meta_objset;
+ uint64_t m;
+ uint64_t oldc = vd->vdev_ms_count;
+ uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift;
+ metaslab_t **mspp;
+ int error;
+
+ ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER));
+
+ /*
+ * This vdev is not being allocated from yet or is a hole.
+ */
+ if (vd->vdev_ms_shift == 0)
+ return (0);
+
+ ASSERT(!vd->vdev_ishole);
+
+ /*
+ * Compute the raidz-deflation ratio. Note, we hard-code
+ * in 128k (1 << 17) because it is the current "typical" blocksize.
+ * Even if SPA_MAXBLOCKSIZE changes, this algorithm must never change,
+ * or we will inconsistently account for existing bp's.
+ */
+ vd->vdev_deflate_ratio = (1 << 17) /
+ (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT);
+
+ ASSERT(oldc <= newc);
+
+ mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP);
+
+ if (oldc != 0) {
+ bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp));
+ kmem_free(vd->vdev_ms, oldc * sizeof (*mspp));
+ }
+
+ vd->vdev_ms = mspp;
+ vd->vdev_ms_count = newc;
+
+ for (m = oldc; m < newc; m++) {
+ space_map_obj_t smo = { 0, 0, 0 };
+ if (txg == 0) {
+ uint64_t object = 0;
+ error = dmu_read(mos, vd->vdev_ms_array,
+ m * sizeof (uint64_t), sizeof (uint64_t), &object,
+ DMU_READ_PREFETCH);
+ if (error)
+ return (error);
+ if (object != 0) {
+ dmu_buf_t *db;
+ error = dmu_bonus_hold(mos, object, FTAG, &db);
+ if (error)
+ return (error);
+ ASSERT3U(db->db_size, >=, sizeof (smo));
+ bcopy(db->db_data, &smo, sizeof (smo));
+ ASSERT3U(smo.smo_object, ==, object);
+ dmu_buf_rele(db, FTAG);
+ }
+ }
+ vd->vdev_ms[m] = metaslab_init(vd->vdev_mg, &smo,
+ m << vd->vdev_ms_shift, 1ULL << vd->vdev_ms_shift, txg);
+ }
+
+ if (txg == 0)
+ spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER);
+
+ /*
+ * If the vdev is being removed we don't activate
+ * the metaslabs since we want to ensure that no new
+ * allocations are performed on this device.
+ */
+ if (oldc == 0 && !vd->vdev_removing)
+ metaslab_group_activate(vd->vdev_mg);
+
+ if (txg == 0)
+ spa_config_exit(spa, SCL_ALLOC, FTAG);
+
+ return (0);
+}
+
+void
+vdev_metaslab_fini(vdev_t *vd)
+{
+ uint64_t m;
+ uint64_t count = vd->vdev_ms_count;
+
+ if (vd->vdev_ms != NULL) {
+ metaslab_group_passivate(vd->vdev_mg);
+ for (m = 0; m < count; m++)
+ if (vd->vdev_ms[m] != NULL)
+ metaslab_fini(vd->vdev_ms[m]);
+ kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *));
+ vd->vdev_ms = NULL;
+ }
+}
+
+typedef struct vdev_probe_stats {
+ boolean_t vps_readable;
+ boolean_t vps_writeable;
+ int vps_flags;
+} vdev_probe_stats_t;
+
+static void
+vdev_probe_done(zio_t *zio)
+{
+ spa_t *spa = zio->io_spa;
+ vdev_t *vd = zio->io_vd;
+ vdev_probe_stats_t *vps = zio->io_private;
+
+ ASSERT(vd->vdev_probe_zio != NULL);
+
+ if (zio->io_type == ZIO_TYPE_READ) {
+ if (zio->io_error == 0)
+ vps->vps_readable = 1;
+ if (zio->io_error == 0 && spa_writeable(spa)) {
+ zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd,
+ zio->io_offset, zio->io_size, zio->io_data,
+ ZIO_CHECKSUM_OFF, vdev_probe_done, vps,
+ ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE));
+ } else {
+ zio_buf_free(zio->io_data, zio->io_size);
+ }
+ } else if (zio->io_type == ZIO_TYPE_WRITE) {
+ if (zio->io_error == 0)
+ vps->vps_writeable = 1;
+ zio_buf_free(zio->io_data, zio->io_size);
+ } else if (zio->io_type == ZIO_TYPE_NULL) {
+ zio_t *pio;
+
+ vd->vdev_cant_read |= !vps->vps_readable;
+ vd->vdev_cant_write |= !vps->vps_writeable;
+
+ if (vdev_readable(vd) &&
+ (vdev_writeable(vd) || !spa_writeable(spa))) {
+ zio->io_error = 0;
+ } else {
+ ASSERT(zio->io_error != 0);
+ zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE,
+ spa, vd, NULL, 0, 0);
+ zio->io_error = ENXIO;
+ }
+
+ mutex_enter(&vd->vdev_probe_lock);
+ ASSERT(vd->vdev_probe_zio == zio);
+ vd->vdev_probe_zio = NULL;
+ mutex_exit(&vd->vdev_probe_lock);
+
+ while ((pio = zio_walk_parents(zio)) != NULL)
+ if (!vdev_accessible(vd, pio))
+ pio->io_error = ENXIO;
+
+ kmem_free(vps, sizeof (*vps));
+ }
+}
+
+/*
+ * Determine whether this device is accessible by reading and writing
+ * to several known locations: the pad regions of each vdev label
+ * but the first (which we leave alone in case it contains a VTOC).
+ */
+zio_t *
+vdev_probe(vdev_t *vd, zio_t *zio)
+{
+ spa_t *spa = vd->vdev_spa;
+ vdev_probe_stats_t *vps = NULL;
+ zio_t *pio;
+
+ ASSERT(vd->vdev_ops->vdev_op_leaf);
+
+ /*
+ * Don't probe the probe.
+ */
+ if (zio && (zio->io_flags & ZIO_FLAG_PROBE))
+ return (NULL);
+
+ /*
+ * To prevent 'probe storms' when a device fails, we create
+ * just one probe i/o at a time. All zios that want to probe
+ * this vdev will become parents of the probe io.
+ */
+ mutex_enter(&vd->vdev_probe_lock);
+
+ if ((pio = vd->vdev_probe_zio) == NULL) {
+ vps = kmem_zalloc(sizeof (*vps), KM_SLEEP);
+
+ vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE |
+ ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE |
+ ZIO_FLAG_TRYHARD;
+
+ if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) {
+ /*
+ * vdev_cant_read and vdev_cant_write can only
+ * transition from TRUE to FALSE when we have the
+ * SCL_ZIO lock as writer; otherwise they can only
+ * transition from FALSE to TRUE. This ensures that
+ * any zio looking at these values can assume that
+ * failures persist for the life of the I/O. That's
+ * important because when a device has intermittent
+ * connectivity problems, we want to ensure that
+ * they're ascribed to the device (ENXIO) and not
+ * the zio (EIO).
+ *
+ * Since we hold SCL_ZIO as writer here, clear both
+ * values so the probe can reevaluate from first
+ * principles.
+ */
+ vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER;
+ vd->vdev_cant_read = B_FALSE;
+ vd->vdev_cant_write = B_FALSE;
+ }
+
+ vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd,
+ vdev_probe_done, vps,
+ vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE);
+
+ /*
+ * We can't change the vdev state in this context, so we
+ * kick off an async task to do it on our behalf.
+ */
+ if (zio != NULL) {
+ vd->vdev_probe_wanted = B_TRUE;
+ spa_async_request(spa, SPA_ASYNC_PROBE);
+ }
+ }
+
+ if (zio != NULL)
+ zio_add_child(zio, pio);
+
+ mutex_exit(&vd->vdev_probe_lock);
+
+ if (vps == NULL) {
+ ASSERT(zio != NULL);
+ return (NULL);
+ }
+
+ for (int l = 1; l < VDEV_LABELS; l++) {
+ zio_nowait(zio_read_phys(pio, vd,
+ vdev_label_offset(vd->vdev_psize, l,
+ offsetof(vdev_label_t, vl_pad2)),
+ VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE),
+ ZIO_CHECKSUM_OFF, vdev_probe_done, vps,
+ ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE));
+ }
+
+ if (zio == NULL)
+ return (pio);
+
+ zio_nowait(pio);
+ return (NULL);
+}
+
+static void
+vdev_open_child(void *arg)
+{
+ vdev_t *vd = arg;
+
+ vd->vdev_open_thread = curthread;
+ vd->vdev_open_error = vdev_open(vd);
+ vd->vdev_open_thread = NULL;
+}
+
+boolean_t
+vdev_uses_zvols(vdev_t *vd)
+{
+ if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR,
+ strlen(ZVOL_DIR)) == 0)
+ return (B_TRUE);
+ for (int c = 0; c < vd->vdev_children; c++)
+ if (vdev_uses_zvols(vd->vdev_child[c]))
+ return (B_TRUE);
+ return (B_FALSE);
+}
+
+void
+vdev_open_children(vdev_t *vd)
+{
+ taskq_t *tq;
+ int children = vd->vdev_children;
+
+ /*
+ * in order to handle pools on top of zvols, do the opens
+ * in a single thread so that the same thread holds the
+ * spa_namespace_lock
+ */
+ if (vdev_uses_zvols(vd)) {
+ for (int c = 0; c < children; c++)
+ vd->vdev_child[c]->vdev_open_error =
+ vdev_open(vd->vdev_child[c]);
+ return;
+ }
+ tq = taskq_create("vdev_open", children, minclsyspri,
+ children, children, TASKQ_PREPOPULATE);
+
+ for (int c = 0; c < children; c++)
+ VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c],
+ TQ_SLEEP) != NULL);
+
+ taskq_destroy(tq);
+}
+
+/*
+ * Prepare a virtual device for access.
+ */
+int
+vdev_open(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+ int error;
+ uint64_t osize = 0;
+ uint64_t asize, psize;
+ uint64_t ashift = 0;
+
+ ASSERT(vd->vdev_open_thread == curthread ||
+ spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
+ ASSERT(vd->vdev_state == VDEV_STATE_CLOSED ||
+ vd->vdev_state == VDEV_STATE_CANT_OPEN ||
+ vd->vdev_state == VDEV_STATE_OFFLINE);
+
+ vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
+ vd->vdev_cant_read = B_FALSE;
+ vd->vdev_cant_write = B_FALSE;
+ vd->vdev_min_asize = vdev_get_min_asize(vd);
+
+ /*
+ * If this vdev is not removed, check its fault status. If it's
+ * faulted, bail out of the open.
+ */
+ if (!vd->vdev_removed && vd->vdev_faulted) {
+ ASSERT(vd->vdev_children == 0);
+ ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED ||
+ vd->vdev_label_aux == VDEV_AUX_EXTERNAL);
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
+ vd->vdev_label_aux);
+ return (ENXIO);
+ } else if (vd->vdev_offline) {
+ ASSERT(vd->vdev_children == 0);
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE);
+ return (ENXIO);
+ }
+
+ error = vd->vdev_ops->vdev_op_open(vd, &osize, &ashift);
+
+ /*
+ * Reset the vdev_reopening flag so that we actually close
+ * the vdev on error.
+ */
+ vd->vdev_reopening = B_FALSE;
+ if (zio_injection_enabled && error == 0)
+ error = zio_handle_device_injection(vd, NULL, ENXIO);
+
+ if (error) {
+ if (vd->vdev_removed &&
+ vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED)
+ vd->vdev_removed = B_FALSE;
+
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
+ vd->vdev_stat.vs_aux);
+ return (error);
+ }
+
+ vd->vdev_removed = B_FALSE;
+
+ /*
+ * Recheck the faulted flag now that we have confirmed that
+ * the vdev is accessible. If we're faulted, bail.
+ */
+ if (vd->vdev_faulted) {
+ ASSERT(vd->vdev_children == 0);
+ ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED ||
+ vd->vdev_label_aux == VDEV_AUX_EXTERNAL);
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
+ vd->vdev_label_aux);
+ return (ENXIO);
+ }
+
+ if (vd->vdev_degraded) {
+ ASSERT(vd->vdev_children == 0);
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED,
+ VDEV_AUX_ERR_EXCEEDED);
+ } else {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0);
+ }
+
+ /*
+ * For hole or missing vdevs we just return success.
+ */
+ if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops)
+ return (0);
+
+ for (int c = 0; c < vd->vdev_children; c++) {
+ if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED,
+ VDEV_AUX_NONE);
+ break;
+ }
+ }
+
+ osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t));
+
+ if (vd->vdev_children == 0) {
+ if (osize < SPA_MINDEVSIZE) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_TOO_SMALL);
+ return (EOVERFLOW);
+ }
+ psize = osize;
+ asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE);
+ } else {
+ if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE -
+ (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_TOO_SMALL);
+ return (EOVERFLOW);
+ }
+ psize = 0;
+ asize = osize;
+ }
+
+ vd->vdev_psize = psize;
+
+ /*
+ * Make sure the allocatable size hasn't shrunk.
+ */
+ if (asize < vd->vdev_min_asize) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_BAD_LABEL);
+ return (EINVAL);
+ }
+
+ if (vd->vdev_asize == 0) {
+ /*
+ * This is the first-ever open, so use the computed values.
+ * For testing purposes, a higher ashift can be requested.
+ */
+ vd->vdev_asize = asize;
+ vd->vdev_ashift = MAX(ashift, vd->vdev_ashift);
+ } else {
+ /*
+ * Make sure the alignment requirement hasn't increased.
+ */
+ if (ashift > vd->vdev_top->vdev_ashift) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_BAD_LABEL);
+ return (EINVAL);
+ }
+ }
+
+ /*
+ * If all children are healthy and the asize has increased,
+ * then we've experienced dynamic LUN growth. If automatic
+ * expansion is enabled then use the additional space.
+ */
+ if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize &&
+ (vd->vdev_expanding || spa->spa_autoexpand))
+ vd->vdev_asize = asize;
+
+ vdev_set_min_asize(vd);
+
+ /*
+ * Ensure we can issue some IO before declaring the
+ * vdev open for business.
+ */
+ if (vd->vdev_ops->vdev_op_leaf &&
+ (error = zio_wait(vdev_probe(vd, NULL))) != 0) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
+ VDEV_AUX_ERR_EXCEEDED);
+ return (error);
+ }
+
+ /*
+ * If a leaf vdev has a DTL, and seems healthy, then kick off a
+ * resilver. But don't do this if we are doing a reopen for a scrub,
+ * since this would just restart the scrub we are already doing.
+ */
+ if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen &&
+ vdev_resilver_needed(vd, NULL, NULL))
+ spa_async_request(spa, SPA_ASYNC_RESILVER);
+
+ return (0);
+}
+
+/*
+ * Called once the vdevs are all opened, this routine validates the label
+ * contents. This needs to be done before vdev_load() so that we don't
+ * inadvertently do repair I/Os to the wrong device.
+ *
+ * This function will only return failure if one of the vdevs indicates that it
+ * has since been destroyed or exported. This is only possible if
+ * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
+ * will be updated but the function will return 0.
+ */
+int
+vdev_validate(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+ nvlist_t *label;
+ uint64_t guid = 0, top_guid;
+ uint64_t state;
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ if (vdev_validate(vd->vdev_child[c]) != 0)
+ return (EBADF);
+
+ /*
+ * If the device has already failed, or was marked offline, don't do
+ * any further validation. Otherwise, label I/O will fail and we will
+ * overwrite the previous state.
+ */
+ if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) {
+ uint64_t aux_guid = 0;
+ nvlist_t *nvl;
+
+ if ((label = vdev_label_read_config(vd)) == NULL) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_BAD_LABEL);
+ return (0);
+ }
+
+ /*
+ * Determine if this vdev has been split off into another
+ * pool. If so, then refuse to open it.
+ */
+ if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID,
+ &aux_guid) == 0 && aux_guid == spa_guid(spa)) {
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_SPLIT_POOL);
+ nvlist_free(label);
+ return (0);
+ }
+
+ if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_GUID,
+ &guid) != 0 || guid != spa_guid(spa)) {
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_CORRUPT_DATA);
+ nvlist_free(label);
+ return (0);
+ }
+
+ if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl)
+ != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID,
+ &aux_guid) != 0)
+ aux_guid = 0;
+
+ /*
+ * If this vdev just became a top-level vdev because its
+ * sibling was detached, it will have adopted the parent's
+ * vdev guid -- but the label may or may not be on disk yet.
+ * Fortunately, either version of the label will have the
+ * same top guid, so if we're a top-level vdev, we can
+ * safely compare to that instead.
+ *
+ * If we split this vdev off instead, then we also check the
+ * original pool's guid. We don't want to consider the vdev
+ * corrupt if it is partway through a split operation.
+ */
+ if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID,
+ &guid) != 0 ||
+ nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID,
+ &top_guid) != 0 ||
+ ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) &&
+ (vd->vdev_guid != top_guid || vd != vd->vdev_top))) {
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_CORRUPT_DATA);
+ nvlist_free(label);
+ return (0);
+ }
+
+ if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE,
+ &state) != 0) {
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_CORRUPT_DATA);
+ nvlist_free(label);
+ return (0);
+ }
+
+ nvlist_free(label);
+
+ /*
+ * If this is a verbatim import, no need to check the
+ * state of the pool.
+ */
+ if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) &&
+ spa_load_state(spa) == SPA_LOAD_OPEN &&
+ state != POOL_STATE_ACTIVE)
+ return (EBADF);
+
+ /*
+ * If we were able to open and validate a vdev that was
+ * previously marked permanently unavailable, clear that state
+ * now.
+ */
+ if (vd->vdev_not_present)
+ vd->vdev_not_present = 0;
+ }
+
+ return (0);
+}
+
+/*
+ * Close a virtual device.
+ */
+void
+vdev_close(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+ vdev_t *pvd = vd->vdev_parent;
+
+ ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
+
+ /*
+ * If our parent is reopening, then we are as well, unless we are
+ * going offline.
+ */
+ if (pvd != NULL && pvd->vdev_reopening)
+ vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline);
+
+ vd->vdev_ops->vdev_op_close(vd);
+
+ vdev_cache_purge(vd);
+
+ /*
+ * We record the previous state before we close it, so that if we are
+ * doing a reopen(), we don't generate FMA ereports if we notice that
+ * it's still faulted.
+ */
+ vd->vdev_prevstate = vd->vdev_state;
+
+ if (vd->vdev_offline)
+ vd->vdev_state = VDEV_STATE_OFFLINE;
+ else
+ vd->vdev_state = VDEV_STATE_CLOSED;
+ vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
+}
+
+void
+vdev_hold(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+
+ ASSERT(spa_is_root(spa));
+ if (spa->spa_state == POOL_STATE_UNINITIALIZED)
+ return;
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_hold(vd->vdev_child[c]);
+
+ if (vd->vdev_ops->vdev_op_leaf)
+ vd->vdev_ops->vdev_op_hold(vd);
+}
+
+void
+vdev_rele(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+
+ ASSERT(spa_is_root(spa));
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_rele(vd->vdev_child[c]);
+
+ if (vd->vdev_ops->vdev_op_leaf)
+ vd->vdev_ops->vdev_op_rele(vd);
+}
+
+/*
+ * Reopen all interior vdevs and any unopened leaves. We don't actually
+ * reopen leaf vdevs which had previously been opened as they might deadlock
+ * on the spa_config_lock. Instead we only obtain the leaf's physical size.
+ * If the leaf has never been opened then open it, as usual.
+ */
+void
+vdev_reopen(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+
+ ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
+
+ /* set the reopening flag unless we're taking the vdev offline */
+ vd->vdev_reopening = !vd->vdev_offline;
+ vdev_close(vd);
+ (void) vdev_open(vd);
+
+ /*
+ * Call vdev_validate() here to make sure we have the same device.
+ * Otherwise, a device with an invalid label could be successfully
+ * opened in response to vdev_reopen().
+ */
+ if (vd->vdev_aux) {
+ (void) vdev_validate_aux(vd);
+ if (vdev_readable(vd) && vdev_writeable(vd) &&
+ vd->vdev_aux == &spa->spa_l2cache &&
+ !l2arc_vdev_present(vd))
+ l2arc_add_vdev(spa, vd);
+ } else {
+ (void) vdev_validate(vd);
+ }
+
+ /*
+ * Reassess parent vdev's health.
+ */
+ vdev_propagate_state(vd);
+}
+
+int
+vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing)
+{
+ int error;
+
+ /*
+ * Normally, partial opens (e.g. of a mirror) are allowed.
+ * For a create, however, we want to fail the request if
+ * there are any components we can't open.
+ */
+ error = vdev_open(vd);
+
+ if (error || vd->vdev_state != VDEV_STATE_HEALTHY) {
+ vdev_close(vd);
+ return (error ? error : ENXIO);
+ }
+
+ /*
+ * Recursively initialize all labels.
+ */
+ if ((error = vdev_label_init(vd, txg, isreplacing ?
+ VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) {
+ vdev_close(vd);
+ return (error);
+ }
+
+ return (0);
+}
+
+void
+vdev_metaslab_set_size(vdev_t *vd)
+{
+ /*
+ * Aim for roughly 200 metaslabs per vdev.
+ */
+ vd->vdev_ms_shift = highbit(vd->vdev_asize / 200);
+ vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT);
+}
+
+void
+vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg)
+{
+ ASSERT(vd == vd->vdev_top);
+ ASSERT(!vd->vdev_ishole);
+ ASSERT(ISP2(flags));
+ ASSERT(spa_writeable(vd->vdev_spa));
+
+ if (flags & VDD_METASLAB)
+ (void) txg_list_add(&vd->vdev_ms_list, arg, txg);
+
+ if (flags & VDD_DTL)
+ (void) txg_list_add(&vd->vdev_dtl_list, arg, txg);
+
+ (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg);
+}
+
+/*
+ * DTLs.
+ *
+ * A vdev's DTL (dirty time log) is the set of transaction groups for which
+ * the vdev has less than perfect replication. There are four kinds of DTL:
+ *
+ * DTL_MISSING: txgs for which the vdev has no valid copies of the data
+ *
+ * DTL_PARTIAL: txgs for which data is available, but not fully replicated
+ *
+ * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
+ * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
+ * txgs that was scrubbed.
+ *
+ * DTL_OUTAGE: txgs which cannot currently be read, whether due to
+ * persistent errors or just some device being offline.
+ * Unlike the other three, the DTL_OUTAGE map is not generally
+ * maintained; it's only computed when needed, typically to
+ * determine whether a device can be detached.
+ *
+ * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
+ * either has the data or it doesn't.
+ *
+ * For interior vdevs such as mirror and RAID-Z the picture is more complex.
+ * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
+ * if any child is less than fully replicated, then so is its parent.
+ * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
+ * comprising only those txgs which appear in 'maxfaults' or more children;
+ * those are the txgs we don't have enough replication to read. For example,
+ * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
+ * thus, its DTL_MISSING consists of the set of txgs that appear in more than
+ * two child DTL_MISSING maps.
+ *
+ * It should be clear from the above that to compute the DTLs and outage maps
+ * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
+ * Therefore, that is all we keep on disk. When loading the pool, or after
+ * a configuration change, we generate all other DTLs from first principles.
+ */
+void
+vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size)
+{
+ space_map_t *sm = &vd->vdev_dtl[t];
+
+ ASSERT(t < DTL_TYPES);
+ ASSERT(vd != vd->vdev_spa->spa_root_vdev);
+ ASSERT(spa_writeable(vd->vdev_spa));
+
+ mutex_enter(sm->sm_lock);
+ if (!space_map_contains(sm, txg, size))
+ space_map_add(sm, txg, size);
+ mutex_exit(sm->sm_lock);
+}
+
+boolean_t
+vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size)
+{
+ space_map_t *sm = &vd->vdev_dtl[t];
+ boolean_t dirty = B_FALSE;
+
+ ASSERT(t < DTL_TYPES);
+ ASSERT(vd != vd->vdev_spa->spa_root_vdev);
+
+ mutex_enter(sm->sm_lock);
+ if (sm->sm_space != 0)
+ dirty = space_map_contains(sm, txg, size);
+ mutex_exit(sm->sm_lock);
+
+ return (dirty);
+}
+
+boolean_t
+vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t)
+{
+ space_map_t *sm = &vd->vdev_dtl[t];
+ boolean_t empty;
+
+ mutex_enter(sm->sm_lock);
+ empty = (sm->sm_space == 0);
+ mutex_exit(sm->sm_lock);
+
+ return (empty);
+}
+
+/*
+ * Reassess DTLs after a config change or scrub completion.
+ */
+void
+vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done)
+{
+ spa_t *spa = vd->vdev_spa;
+ avl_tree_t reftree;
+ int minref;
+
+ ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_dtl_reassess(vd->vdev_child[c], txg,
+ scrub_txg, scrub_done);
+
+ if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux)
+ return;
+
+ if (vd->vdev_ops->vdev_op_leaf) {
+ dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
+
+ mutex_enter(&vd->vdev_dtl_lock);
+ if (scrub_txg != 0 &&
+ (spa->spa_scrub_started ||
+ (scn && scn->scn_phys.scn_errors == 0))) {
+ /*
+ * We completed a scrub up to scrub_txg. If we
+ * did it without rebooting, then the scrub dtl
+ * will be valid, so excise the old region and
+ * fold in the scrub dtl. Otherwise, leave the
+ * dtl as-is if there was an error.
+ *
+ * There's little trick here: to excise the beginning
+ * of the DTL_MISSING map, we put it into a reference
+ * tree and then add a segment with refcnt -1 that
+ * covers the range [0, scrub_txg). This means
+ * that each txg in that range has refcnt -1 or 0.
+ * We then add DTL_SCRUB with a refcnt of 2, so that
+ * entries in the range [0, scrub_txg) will have a
+ * positive refcnt -- either 1 or 2. We then convert
+ * the reference tree into the new DTL_MISSING map.
+ */
+ space_map_ref_create(&reftree);
+ space_map_ref_add_map(&reftree,
+ &vd->vdev_dtl[DTL_MISSING], 1);
+ space_map_ref_add_seg(&reftree, 0, scrub_txg, -1);
+ space_map_ref_add_map(&reftree,
+ &vd->vdev_dtl[DTL_SCRUB], 2);
+ space_map_ref_generate_map(&reftree,
+ &vd->vdev_dtl[DTL_MISSING], 1);
+ space_map_ref_destroy(&reftree);
+ }
+ space_map_vacate(&vd->vdev_dtl[DTL_PARTIAL], NULL, NULL);
+ space_map_walk(&vd->vdev_dtl[DTL_MISSING],
+ space_map_add, &vd->vdev_dtl[DTL_PARTIAL]);
+ if (scrub_done)
+ space_map_vacate(&vd->vdev_dtl[DTL_SCRUB], NULL, NULL);
+ space_map_vacate(&vd->vdev_dtl[DTL_OUTAGE], NULL, NULL);
+ if (!vdev_readable(vd))
+ space_map_add(&vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL);
+ else
+ space_map_walk(&vd->vdev_dtl[DTL_MISSING],
+ space_map_add, &vd->vdev_dtl[DTL_OUTAGE]);
+ mutex_exit(&vd->vdev_dtl_lock);
+
+ if (txg != 0)
+ vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg);
+ return;
+ }
+
+ mutex_enter(&vd->vdev_dtl_lock);
+ for (int t = 0; t < DTL_TYPES; t++) {
+ /* account for child's outage in parent's missing map */
+ int s = (t == DTL_MISSING) ? DTL_OUTAGE: t;
+ if (t == DTL_SCRUB)
+ continue; /* leaf vdevs only */
+ if (t == DTL_PARTIAL)
+ minref = 1; /* i.e. non-zero */
+ else if (vd->vdev_nparity != 0)
+ minref = vd->vdev_nparity + 1; /* RAID-Z */
+ else
+ minref = vd->vdev_children; /* any kind of mirror */
+ space_map_ref_create(&reftree);
+ for (int c = 0; c < vd->vdev_children; c++) {
+ vdev_t *cvd = vd->vdev_child[c];
+ mutex_enter(&cvd->vdev_dtl_lock);
+ space_map_ref_add_map(&reftree, &cvd->vdev_dtl[s], 1);
+ mutex_exit(&cvd->vdev_dtl_lock);
+ }
+ space_map_ref_generate_map(&reftree, &vd->vdev_dtl[t], minref);
+ space_map_ref_destroy(&reftree);
+ }
+ mutex_exit(&vd->vdev_dtl_lock);
+}
+
+static int
+vdev_dtl_load(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+ space_map_obj_t *smo = &vd->vdev_dtl_smo;
+ objset_t *mos = spa->spa_meta_objset;
+ dmu_buf_t *db;
+ int error;
+
+ ASSERT(vd->vdev_children == 0);
+
+ if (smo->smo_object == 0)
+ return (0);
+
+ ASSERT(!vd->vdev_ishole);
+
+ if ((error = dmu_bonus_hold(mos, smo->smo_object, FTAG, &db)) != 0)
+ return (error);
+
+ ASSERT3U(db->db_size, >=, sizeof (*smo));
+ bcopy(db->db_data, smo, sizeof (*smo));
+ dmu_buf_rele(db, FTAG);
+
+ mutex_enter(&vd->vdev_dtl_lock);
+ error = space_map_load(&vd->vdev_dtl[DTL_MISSING],
+ NULL, SM_ALLOC, smo, mos);
+ mutex_exit(&vd->vdev_dtl_lock);
+
+ return (error);
+}
+
+void
+vdev_dtl_sync(vdev_t *vd, uint64_t txg)
+{
+ spa_t *spa = vd->vdev_spa;
+ space_map_obj_t *smo = &vd->vdev_dtl_smo;
+ space_map_t *sm = &vd->vdev_dtl[DTL_MISSING];
+ objset_t *mos = spa->spa_meta_objset;
+ space_map_t smsync;
+ kmutex_t smlock;
+ dmu_buf_t *db;
+ dmu_tx_t *tx;
+
+ ASSERT(!vd->vdev_ishole);
+
+ tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
+
+ if (vd->vdev_detached) {
+ if (smo->smo_object != 0) {
+ int err = dmu_object_free(mos, smo->smo_object, tx);
+ ASSERT3U(err, ==, 0);
+ smo->smo_object = 0;
+ }
+ dmu_tx_commit(tx);
+ return;
+ }
+
+ if (smo->smo_object == 0) {
+ ASSERT(smo->smo_objsize == 0);
+ ASSERT(smo->smo_alloc == 0);
+ smo->smo_object = dmu_object_alloc(mos,
+ DMU_OT_SPACE_MAP, 1 << SPACE_MAP_BLOCKSHIFT,
+ DMU_OT_SPACE_MAP_HEADER, sizeof (*smo), tx);
+ ASSERT(smo->smo_object != 0);
+ vdev_config_dirty(vd->vdev_top);
+ }
+
+ mutex_init(&smlock, NULL, MUTEX_DEFAULT, NULL);
+
+ space_map_create(&smsync, sm->sm_start, sm->sm_size, sm->sm_shift,
+ &smlock);
+
+ mutex_enter(&smlock);
+
+ mutex_enter(&vd->vdev_dtl_lock);
+ space_map_walk(sm, space_map_add, &smsync);
+ mutex_exit(&vd->vdev_dtl_lock);
+
+ space_map_truncate(smo, mos, tx);
+ space_map_sync(&smsync, SM_ALLOC, smo, mos, tx);
+
+ space_map_destroy(&smsync);
+
+ mutex_exit(&smlock);
+ mutex_destroy(&smlock);
+
+ VERIFY(0 == dmu_bonus_hold(mos, smo->smo_object, FTAG, &db));
+ dmu_buf_will_dirty(db, tx);
+ ASSERT3U(db->db_size, >=, sizeof (*smo));
+ bcopy(smo, db->db_data, sizeof (*smo));
+ dmu_buf_rele(db, FTAG);
+
+ dmu_tx_commit(tx);
+}
+
+/*
+ * Determine whether the specified vdev can be offlined/detached/removed
+ * without losing data.
+ */
+boolean_t
+vdev_dtl_required(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+ vdev_t *tvd = vd->vdev_top;
+ uint8_t cant_read = vd->vdev_cant_read;
+ boolean_t required;
+
+ ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
+
+ if (vd == spa->spa_root_vdev || vd == tvd)
+ return (B_TRUE);
+
+ /*
+ * Temporarily mark the device as unreadable, and then determine
+ * whether this results in any DTL outages in the top-level vdev.
+ * If not, we can safely offline/detach/remove the device.
+ */
+ vd->vdev_cant_read = B_TRUE;
+ vdev_dtl_reassess(tvd, 0, 0, B_FALSE);
+ required = !vdev_dtl_empty(tvd, DTL_OUTAGE);
+ vd->vdev_cant_read = cant_read;
+ vdev_dtl_reassess(tvd, 0, 0, B_FALSE);
+
+ if (!required && zio_injection_enabled)
+ required = !!zio_handle_device_injection(vd, NULL, ECHILD);
+
+ return (required);
+}
+
+/*
+ * Determine if resilver is needed, and if so the txg range.
+ */
+boolean_t
+vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp)
+{
+ boolean_t needed = B_FALSE;
+ uint64_t thismin = UINT64_MAX;
+ uint64_t thismax = 0;
+
+ if (vd->vdev_children == 0) {
+ mutex_enter(&vd->vdev_dtl_lock);
+ if (vd->vdev_dtl[DTL_MISSING].sm_space != 0 &&
+ vdev_writeable(vd)) {
+ space_seg_t *ss;
+
+ ss = avl_first(&vd->vdev_dtl[DTL_MISSING].sm_root);
+ thismin = ss->ss_start - 1;
+ ss = avl_last(&vd->vdev_dtl[DTL_MISSING].sm_root);
+ thismax = ss->ss_end;
+ needed = B_TRUE;
+ }
+ mutex_exit(&vd->vdev_dtl_lock);
+ } else {
+ for (int c = 0; c < vd->vdev_children; c++) {
+ vdev_t *cvd = vd->vdev_child[c];
+ uint64_t cmin, cmax;
+
+ if (vdev_resilver_needed(cvd, &cmin, &cmax)) {
+ thismin = MIN(thismin, cmin);
+ thismax = MAX(thismax, cmax);
+ needed = B_TRUE;
+ }
+ }
+ }
+
+ if (needed && minp) {
+ *minp = thismin;
+ *maxp = thismax;
+ }
+ return (needed);
+}
+
+void
+vdev_load(vdev_t *vd)
+{
+ /*
+ * Recursively load all children.
+ */
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_load(vd->vdev_child[c]);
+
+ /*
+ * If this is a top-level vdev, initialize its metaslabs.
+ */
+ if (vd == vd->vdev_top && !vd->vdev_ishole &&
+ (vd->vdev_ashift == 0 || vd->vdev_asize == 0 ||
+ vdev_metaslab_init(vd, 0) != 0))
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_CORRUPT_DATA);
+
+ /*
+ * If this is a leaf vdev, load its DTL.
+ */
+ if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0)
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_CORRUPT_DATA);
+}
+
+/*
+ * The special vdev case is used for hot spares and l2cache devices. Its
+ * sole purpose it to set the vdev state for the associated vdev. To do this,
+ * we make sure that we can open the underlying device, then try to read the
+ * label, and make sure that the label is sane and that it hasn't been
+ * repurposed to another pool.
+ */
+int
+vdev_validate_aux(vdev_t *vd)
+{
+ nvlist_t *label;
+ uint64_t guid, version;
+ uint64_t state;
+
+ if (!vdev_readable(vd))
+ return (0);
+
+ if ((label = vdev_label_read_config(vd)) == NULL) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_CORRUPT_DATA);
+ return (-1);
+ }
+
+ if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 ||
+ version > SPA_VERSION ||
+ nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 ||
+ guid != vd->vdev_guid ||
+ nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) {
+ vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_CORRUPT_DATA);
+ nvlist_free(label);
+ return (-1);
+ }
+
+ /*
+ * We don't actually check the pool state here. If it's in fact in
+ * use by another pool, we update this fact on the fly when requested.
+ */
+ nvlist_free(label);
+ return (0);
+}
+
+void
+vdev_remove(vdev_t *vd, uint64_t txg)
+{
+ spa_t *spa = vd->vdev_spa;
+ objset_t *mos = spa->spa_meta_objset;
+ dmu_tx_t *tx;
+
+ tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg);
+
+ if (vd->vdev_dtl_smo.smo_object) {
+ ASSERT3U(vd->vdev_dtl_smo.smo_alloc, ==, 0);
+ (void) dmu_object_free(mos, vd->vdev_dtl_smo.smo_object, tx);
+ vd->vdev_dtl_smo.smo_object = 0;
+ }
+
+ if (vd->vdev_ms != NULL) {
+ for (int m = 0; m < vd->vdev_ms_count; m++) {
+ metaslab_t *msp = vd->vdev_ms[m];
+
+ if (msp == NULL || msp->ms_smo.smo_object == 0)
+ continue;
+
+ ASSERT3U(msp->ms_smo.smo_alloc, ==, 0);
+ (void) dmu_object_free(mos, msp->ms_smo.smo_object, tx);
+ msp->ms_smo.smo_object = 0;
+ }
+ }
+
+ if (vd->vdev_ms_array) {
+ (void) dmu_object_free(mos, vd->vdev_ms_array, tx);
+ vd->vdev_ms_array = 0;
+ vd->vdev_ms_shift = 0;
+ }
+ dmu_tx_commit(tx);
+}
+
+void
+vdev_sync_done(vdev_t *vd, uint64_t txg)
+{
+ metaslab_t *msp;
+ boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg));
+
+ ASSERT(!vd->vdev_ishole);
+
+ while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg)))
+ metaslab_sync_done(msp, txg);
+
+ if (reassess)
+ metaslab_sync_reassess(vd->vdev_mg);
+}
+
+void
+vdev_sync(vdev_t *vd, uint64_t txg)
+{
+ spa_t *spa = vd->vdev_spa;
+ vdev_t *lvd;
+ metaslab_t *msp;
+ dmu_tx_t *tx;
+
+ ASSERT(!vd->vdev_ishole);
+
+ if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) {
+ ASSERT(vd == vd->vdev_top);
+ tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
+ vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset,
+ DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx);
+ ASSERT(vd->vdev_ms_array != 0);
+ vdev_config_dirty(vd);
+ dmu_tx_commit(tx);
+ }
+
+ /*
+ * Remove the metadata associated with this vdev once it's empty.
+ */
+ if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing)
+ vdev_remove(vd, txg);
+
+ while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) {
+ metaslab_sync(msp, txg);
+ (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg));
+ }
+
+ while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL)
+ vdev_dtl_sync(lvd, txg);
+
+ (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg));
+}
+
+uint64_t
+vdev_psize_to_asize(vdev_t *vd, uint64_t psize)
+{
+ return (vd->vdev_ops->vdev_op_asize(vd, psize));
+}
+
+/*
+ * Mark the given vdev faulted. A faulted vdev behaves as if the device could
+ * not be opened, and no I/O is attempted.
+ */
+int
+vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux)
+{
+ vdev_t *vd, *tvd;
+
+ spa_vdev_state_enter(spa, SCL_NONE);
+
+ if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
+ return (spa_vdev_state_exit(spa, NULL, ENODEV));
+
+ if (!vd->vdev_ops->vdev_op_leaf)
+ return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
+
+ tvd = vd->vdev_top;
+
+ /*
+ * We don't directly use the aux state here, but if we do a
+ * vdev_reopen(), we need this value to be present to remember why we
+ * were faulted.
+ */
+ vd->vdev_label_aux = aux;
+
+ /*
+ * Faulted state takes precedence over degraded.
+ */
+ vd->vdev_delayed_close = B_FALSE;
+ vd->vdev_faulted = 1ULL;
+ vd->vdev_degraded = 0ULL;
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux);
+
+ /*
+ * If this device has the only valid copy of the data, then
+ * back off and simply mark the vdev as degraded instead.
+ */
+ if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) {
+ vd->vdev_degraded = 1ULL;
+ vd->vdev_faulted = 0ULL;
+
+ /*
+ * If we reopen the device and it's not dead, only then do we
+ * mark it degraded.
+ */
+ vdev_reopen(tvd);
+
+ if (vdev_readable(vd))
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux);
+ }
+
+ return (spa_vdev_state_exit(spa, vd, 0));
+}
+
+/*
+ * Mark the given vdev degraded. A degraded vdev is purely an indication to the
+ * user that something is wrong. The vdev continues to operate as normal as far
+ * as I/O is concerned.
+ */
+int
+vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux)
+{
+ vdev_t *vd;
+
+ spa_vdev_state_enter(spa, SCL_NONE);
+
+ if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
+ return (spa_vdev_state_exit(spa, NULL, ENODEV));
+
+ if (!vd->vdev_ops->vdev_op_leaf)
+ return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
+
+ /*
+ * If the vdev is already faulted, then don't do anything.
+ */
+ if (vd->vdev_faulted || vd->vdev_degraded)
+ return (spa_vdev_state_exit(spa, NULL, 0));
+
+ vd->vdev_degraded = 1ULL;
+ if (!vdev_is_dead(vd))
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED,
+ aux);
+
+ return (spa_vdev_state_exit(spa, vd, 0));
+}
+
+/*
+ * Online the given vdev. If 'unspare' is set, it implies two things. First,
+ * any attached spare device should be detached when the device finishes
+ * resilvering. Second, the online should be treated like a 'test' online case,
+ * so no FMA events are generated if the device fails to open.
+ */
+int
+vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate)
+{
+ vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev;
+
+ spa_vdev_state_enter(spa, SCL_NONE);
+
+ if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
+ return (spa_vdev_state_exit(spa, NULL, ENODEV));
+
+ if (!vd->vdev_ops->vdev_op_leaf)
+ return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
+
+ tvd = vd->vdev_top;
+ vd->vdev_offline = B_FALSE;
+ vd->vdev_tmpoffline = B_FALSE;
+ vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE);
+ vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT);
+
+ /* XXX - L2ARC 1.0 does not support expansion */
+ if (!vd->vdev_aux) {
+ for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
+ pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND);
+ }
+
+ vdev_reopen(tvd);
+ vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE;
+
+ if (!vd->vdev_aux) {
+ for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
+ pvd->vdev_expanding = B_FALSE;
+ }
+
+ if (newstate)
+ *newstate = vd->vdev_state;
+ if ((flags & ZFS_ONLINE_UNSPARE) &&
+ !vdev_is_dead(vd) && vd->vdev_parent &&
+ vd->vdev_parent->vdev_ops == &vdev_spare_ops &&
+ vd->vdev_parent->vdev_child[0] == vd)
+ vd->vdev_unspare = B_TRUE;
+
+ if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) {
+
+ /* XXX - L2ARC 1.0 does not support expansion */
+ if (vd->vdev_aux)
+ return (spa_vdev_state_exit(spa, vd, ENOTSUP));
+ spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
+ }
+ return (spa_vdev_state_exit(spa, vd, 0));
+}
+
+static int
+vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags)
+{
+ vdev_t *vd, *tvd;
+ int error = 0;
+ uint64_t generation;
+ metaslab_group_t *mg;
+
+top:
+ spa_vdev_state_enter(spa, SCL_ALLOC);
+
+ if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
+ return (spa_vdev_state_exit(spa, NULL, ENODEV));
+
+ if (!vd->vdev_ops->vdev_op_leaf)
+ return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
+
+ tvd = vd->vdev_top;
+ mg = tvd->vdev_mg;
+ generation = spa->spa_config_generation + 1;
+
+ /*
+ * If the device isn't already offline, try to offline it.
+ */
+ if (!vd->vdev_offline) {
+ /*
+ * If this device has the only valid copy of some data,
+ * don't allow it to be offlined. Log devices are always
+ * expendable.
+ */
+ if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
+ vdev_dtl_required(vd))
+ return (spa_vdev_state_exit(spa, NULL, EBUSY));
+
+ /*
+ * If the top-level is a slog and it has had allocations
+ * then proceed. We check that the vdev's metaslab group
+ * is not NULL since it's possible that we may have just
+ * added this vdev but not yet initialized its metaslabs.
+ */
+ if (tvd->vdev_islog && mg != NULL) {
+ /*
+ * Prevent any future allocations.
+ */
+ metaslab_group_passivate(mg);
+ (void) spa_vdev_state_exit(spa, vd, 0);
+
+ error = spa_offline_log(spa);
+
+ spa_vdev_state_enter(spa, SCL_ALLOC);
+
+ /*
+ * Check to see if the config has changed.
+ */
+ if (error || generation != spa->spa_config_generation) {
+ metaslab_group_activate(mg);
+ if (error)
+ return (spa_vdev_state_exit(spa,
+ vd, error));
+ (void) spa_vdev_state_exit(spa, vd, 0);
+ goto top;
+ }
+ ASSERT3U(tvd->vdev_stat.vs_alloc, ==, 0);
+ }
+
+ /*
+ * Offline this device and reopen its top-level vdev.
+ * If the top-level vdev is a log device then just offline
+ * it. Otherwise, if this action results in the top-level
+ * vdev becoming unusable, undo it and fail the request.
+ */
+ vd->vdev_offline = B_TRUE;
+ vdev_reopen(tvd);
+
+ if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
+ vdev_is_dead(tvd)) {
+ vd->vdev_offline = B_FALSE;
+ vdev_reopen(tvd);
+ return (spa_vdev_state_exit(spa, NULL, EBUSY));
+ }
+
+ /*
+ * Add the device back into the metaslab rotor so that
+ * once we online the device it's open for business.
+ */
+ if (tvd->vdev_islog && mg != NULL)
+ metaslab_group_activate(mg);
+ }
+
+ vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY);
+
+ return (spa_vdev_state_exit(spa, vd, 0));
+}
+
+int
+vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags)
+{
+ int error;
+
+ mutex_enter(&spa->spa_vdev_top_lock);
+ error = vdev_offline_locked(spa, guid, flags);
+ mutex_exit(&spa->spa_vdev_top_lock);
+
+ return (error);
+}
+
+/*
+ * Clear the error counts associated with this vdev. Unlike vdev_online() and
+ * vdev_offline(), we assume the spa config is locked. We also clear all
+ * children. If 'vd' is NULL, then the user wants to clear all vdevs.
+ */
+void
+vdev_clear(spa_t *spa, vdev_t *vd)
+{
+ vdev_t *rvd = spa->spa_root_vdev;
+
+ ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
+
+ if (vd == NULL)
+ vd = rvd;
+
+ vd->vdev_stat.vs_read_errors = 0;
+ vd->vdev_stat.vs_write_errors = 0;
+ vd->vdev_stat.vs_checksum_errors = 0;
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_clear(spa, vd->vdev_child[c]);
+
+ /*
+ * If we're in the FAULTED state or have experienced failed I/O, then
+ * clear the persistent state and attempt to reopen the device. We
+ * also mark the vdev config dirty, so that the new faulted state is
+ * written out to disk.
+ */
+ if (vd->vdev_faulted || vd->vdev_degraded ||
+ !vdev_readable(vd) || !vdev_writeable(vd)) {
+
+ /*
+ * When reopening in reponse to a clear event, it may be due to
+ * a fmadm repair request. In this case, if the device is
+ * still broken, we want to still post the ereport again.
+ */
+ vd->vdev_forcefault = B_TRUE;
+
+ vd->vdev_faulted = vd->vdev_degraded = 0ULL;
+ vd->vdev_cant_read = B_FALSE;
+ vd->vdev_cant_write = B_FALSE;
+
+ vdev_reopen(vd == rvd ? rvd : vd->vdev_top);
+
+ vd->vdev_forcefault = B_FALSE;
+
+ if (vd != rvd && vdev_writeable(vd->vdev_top))
+ vdev_state_dirty(vd->vdev_top);
+
+ if (vd->vdev_aux == NULL && !vdev_is_dead(vd))
+ spa_async_request(spa, SPA_ASYNC_RESILVER);
+
+ spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR);
+ }
+
+ /*
+ * When clearing a FMA-diagnosed fault, we always want to
+ * unspare the device, as we assume that the original spare was
+ * done in response to the FMA fault.
+ */
+ if (!vdev_is_dead(vd) && vd->vdev_parent != NULL &&
+ vd->vdev_parent->vdev_ops == &vdev_spare_ops &&
+ vd->vdev_parent->vdev_child[0] == vd)
+ vd->vdev_unspare = B_TRUE;
+}
+
+boolean_t
+vdev_is_dead(vdev_t *vd)
+{
+ /*
+ * Holes and missing devices are always considered "dead".
+ * This simplifies the code since we don't have to check for
+ * these types of devices in the various code paths.
+ * Instead we rely on the fact that we skip over dead devices
+ * before issuing I/O to them.
+ */
+ return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole ||
+ vd->vdev_ops == &vdev_missing_ops);
+}
+
+boolean_t
+vdev_readable(vdev_t *vd)
+{
+ return (!vdev_is_dead(vd) && !vd->vdev_cant_read);
+}
+
+boolean_t
+vdev_writeable(vdev_t *vd)
+{
+ return (!vdev_is_dead(vd) && !vd->vdev_cant_write);
+}
+
+boolean_t
+vdev_allocatable(vdev_t *vd)
+{
+ uint64_t state = vd->vdev_state;
+
+ /*
+ * We currently allow allocations from vdevs which may be in the
+ * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
+ * fails to reopen then we'll catch it later when we're holding
+ * the proper locks. Note that we have to get the vdev state
+ * in a local variable because although it changes atomically,
+ * we're asking two separate questions about it.
+ */
+ return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) &&
+ !vd->vdev_cant_write && !vd->vdev_ishole);
+}
+
+boolean_t
+vdev_accessible(vdev_t *vd, zio_t *zio)
+{
+ ASSERT(zio->io_vd == vd);
+
+ if (vdev_is_dead(vd) || vd->vdev_remove_wanted)
+ return (B_FALSE);
+
+ if (zio->io_type == ZIO_TYPE_READ)
+ return (!vd->vdev_cant_read);
+
+ if (zio->io_type == ZIO_TYPE_WRITE)
+ return (!vd->vdev_cant_write);
+
+ return (B_TRUE);
+}
+
+/*
+ * Get statistics for the given vdev.
+ */
+void
+vdev_get_stats(vdev_t *vd, vdev_stat_t *vs)
+{
+ vdev_t *rvd = vd->vdev_spa->spa_root_vdev;
+
+ mutex_enter(&vd->vdev_stat_lock);
+ bcopy(&vd->vdev_stat, vs, sizeof (*vs));
+ vs->vs_timestamp = gethrtime() - vs->vs_timestamp;
+ vs->vs_state = vd->vdev_state;
+ vs->vs_rsize = vdev_get_min_asize(vd);
+ if (vd->vdev_ops->vdev_op_leaf)
+ vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE;
+ mutex_exit(&vd->vdev_stat_lock);
+
+ /*
+ * If we're getting stats on the root vdev, aggregate the I/O counts
+ * over all top-level vdevs (i.e. the direct children of the root).
+ */
+ if (vd == rvd) {
+ for (int c = 0; c < rvd->vdev_children; c++) {
+ vdev_t *cvd = rvd->vdev_child[c];
+ vdev_stat_t *cvs = &cvd->vdev_stat;
+
+ mutex_enter(&vd->vdev_stat_lock);
+ for (int t = 0; t < ZIO_TYPES; t++) {
+ vs->vs_ops[t] += cvs->vs_ops[t];
+ vs->vs_bytes[t] += cvs->vs_bytes[t];
+ }
+ cvs->vs_scan_removing = cvd->vdev_removing;
+ mutex_exit(&vd->vdev_stat_lock);
+ }
+ }
+}
+
+void
+vdev_clear_stats(vdev_t *vd)
+{
+ mutex_enter(&vd->vdev_stat_lock);
+ vd->vdev_stat.vs_space = 0;
+ vd->vdev_stat.vs_dspace = 0;
+ vd->vdev_stat.vs_alloc = 0;
+ mutex_exit(&vd->vdev_stat_lock);
+}
+
+void
+vdev_scan_stat_init(vdev_t *vd)
+{
+ vdev_stat_t *vs = &vd->vdev_stat;
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ vdev_scan_stat_init(vd->vdev_child[c]);
+
+ mutex_enter(&vd->vdev_stat_lock);
+ vs->vs_scan_processed = 0;
+ mutex_exit(&vd->vdev_stat_lock);
+}
+
+void
+vdev_stat_update(zio_t *zio, uint64_t psize)
+{
+ spa_t *spa = zio->io_spa;
+ vdev_t *rvd = spa->spa_root_vdev;
+ vdev_t *vd = zio->io_vd ? zio->io_vd : rvd;
+ vdev_t *pvd;
+ uint64_t txg = zio->io_txg;
+ vdev_stat_t *vs = &vd->vdev_stat;
+ zio_type_t type = zio->io_type;
+ int flags = zio->io_flags;
+
+ /*
+ * If this i/o is a gang leader, it didn't do any actual work.
+ */
+ if (zio->io_gang_tree)
+ return;
+
+ if (zio->io_error == 0) {
+ /*
+ * If this is a root i/o, don't count it -- we've already
+ * counted the top-level vdevs, and vdev_get_stats() will
+ * aggregate them when asked. This reduces contention on
+ * the root vdev_stat_lock and implicitly handles blocks
+ * that compress away to holes, for which there is no i/o.
+ * (Holes never create vdev children, so all the counters
+ * remain zero, which is what we want.)
+ *
+ * Note: this only applies to successful i/o (io_error == 0)
+ * because unlike i/o counts, errors are not additive.
+ * When reading a ditto block, for example, failure of
+ * one top-level vdev does not imply a root-level error.
+ */
+ if (vd == rvd)
+ return;
+
+ ASSERT(vd == zio->io_vd);
+
+ if (flags & ZIO_FLAG_IO_BYPASS)
+ return;
+
+ mutex_enter(&vd->vdev_stat_lock);
+
+ if (flags & ZIO_FLAG_IO_REPAIR) {
+ if (flags & ZIO_FLAG_SCAN_THREAD) {
+ dsl_scan_phys_t *scn_phys =
+ &spa->spa_dsl_pool->dp_scan->scn_phys;
+ uint64_t *processed = &scn_phys->scn_processed;
+
+ /* XXX cleanup? */
+ if (vd->vdev_ops->vdev_op_leaf)
+ atomic_add_64(processed, psize);
+ vs->vs_scan_processed += psize;
+ }
+
+ if (flags & ZIO_FLAG_SELF_HEAL)
+ vs->vs_self_healed += psize;
+ }
+
+ vs->vs_ops[type]++;
+ vs->vs_bytes[type] += psize;
+
+ mutex_exit(&vd->vdev_stat_lock);
+ return;
+ }
+
+ if (flags & ZIO_FLAG_SPECULATIVE)
+ return;
+
+ /*
+ * If this is an I/O error that is going to be retried, then ignore the
+ * error. Otherwise, the user may interpret B_FAILFAST I/O errors as
+ * hard errors, when in reality they can happen for any number of
+ * innocuous reasons (bus resets, MPxIO link failure, etc).
+ */
+ if (zio->io_error == EIO &&
+ !(zio->io_flags & ZIO_FLAG_IO_RETRY))
+ return;
+
+ /*
+ * Intent logs writes won't propagate their error to the root
+ * I/O so don't mark these types of failures as pool-level
+ * errors.
+ */
+ if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE))
+ return;
+
+ mutex_enter(&vd->vdev_stat_lock);
+ if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) {
+ if (zio->io_error == ECKSUM)
+ vs->vs_checksum_errors++;
+ else
+ vs->vs_read_errors++;
+ }
+ if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd))
+ vs->vs_write_errors++;
+ mutex_exit(&vd->vdev_stat_lock);
+
+ if (type == ZIO_TYPE_WRITE && txg != 0 &&
+ (!(flags & ZIO_FLAG_IO_REPAIR) ||
+ (flags & ZIO_FLAG_SCAN_THREAD) ||
+ spa->spa_claiming)) {
+ /*
+ * This is either a normal write (not a repair), or it's
+ * a repair induced by the scrub thread, or it's a repair
+ * made by zil_claim() during spa_load() in the first txg.
+ * In the normal case, we commit the DTL change in the same
+ * txg as the block was born. In the scrub-induced repair
+ * case, we know that scrubs run in first-pass syncing context,
+ * so we commit the DTL change in spa_syncing_txg(spa).
+ * In the zil_claim() case, we commit in spa_first_txg(spa).
+ *
+ * We currently do not make DTL entries for failed spontaneous
+ * self-healing writes triggered by normal (non-scrubbing)
+ * reads, because we have no transactional context in which to
+ * do so -- and it's not clear that it'd be desirable anyway.
+ */
+ if (vd->vdev_ops->vdev_op_leaf) {
+ uint64_t commit_txg = txg;
+ if (flags & ZIO_FLAG_SCAN_THREAD) {
+ ASSERT(flags & ZIO_FLAG_IO_REPAIR);
+ ASSERT(spa_sync_pass(spa) == 1);
+ vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1);
+ commit_txg = spa_syncing_txg(spa);
+ } else if (spa->spa_claiming) {
+ ASSERT(flags & ZIO_FLAG_IO_REPAIR);
+ commit_txg = spa_first_txg(spa);
+ }
+ ASSERT(commit_txg >= spa_syncing_txg(spa));
+ if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1))
+ return;
+ for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
+ vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1);
+ vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg);
+ }
+ if (vd != rvd)
+ vdev_dtl_dirty(vd, DTL_MISSING, txg, 1);
+ }
+}
+
+/*
+ * Update the in-core space usage stats for this vdev, its metaslab class,
+ * and the root vdev.
+ */
+void
+vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta,
+ int64_t space_delta)
+{
+ int64_t dspace_delta = space_delta;
+ spa_t *spa = vd->vdev_spa;
+ vdev_t *rvd = spa->spa_root_vdev;
+ metaslab_group_t *mg = vd->vdev_mg;
+ metaslab_class_t *mc = mg ? mg->mg_class : NULL;
+
+ ASSERT(vd == vd->vdev_top);
+
+ /*
+ * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
+ * factor. We must calculate this here and not at the root vdev
+ * because the root vdev's psize-to-asize is simply the max of its
+ * childrens', thus not accurate enough for us.
+ */
+ ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0);
+ ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache);
+ dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) *
+ vd->vdev_deflate_ratio;
+
+ mutex_enter(&vd->vdev_stat_lock);
+ vd->vdev_stat.vs_alloc += alloc_delta;
+ vd->vdev_stat.vs_space += space_delta;
+ vd->vdev_stat.vs_dspace += dspace_delta;
+ mutex_exit(&vd->vdev_stat_lock);
+
+ if (mc == spa_normal_class(spa)) {
+ mutex_enter(&rvd->vdev_stat_lock);
+ rvd->vdev_stat.vs_alloc += alloc_delta;
+ rvd->vdev_stat.vs_space += space_delta;
+ rvd->vdev_stat.vs_dspace += dspace_delta;
+ mutex_exit(&rvd->vdev_stat_lock);
+ }
+
+ if (mc != NULL) {
+ ASSERT(rvd == vd->vdev_parent);
+ ASSERT(vd->vdev_ms_count != 0);
+
+ metaslab_class_space_update(mc,
+ alloc_delta, defer_delta, space_delta, dspace_delta);
+ }
+}
+
+/*
+ * Mark a top-level vdev's config as dirty, placing it on the dirty list
+ * so that it will be written out next time the vdev configuration is synced.
+ * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
+ */
+void
+vdev_config_dirty(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+ vdev_t *rvd = spa->spa_root_vdev;
+ int c;
+
+ ASSERT(spa_writeable(spa));
+
+ /*
+ * If this is an aux vdev (as with l2cache and spare devices), then we
+ * update the vdev config manually and set the sync flag.
+ */
+ if (vd->vdev_aux != NULL) {
+ spa_aux_vdev_t *sav = vd->vdev_aux;
+ nvlist_t **aux;
+ uint_t naux;
+
+ for (c = 0; c < sav->sav_count; c++) {
+ if (sav->sav_vdevs[c] == vd)
+ break;
+ }
+
+ if (c == sav->sav_count) {
+ /*
+ * We're being removed. There's nothing more to do.
+ */
+ ASSERT(sav->sav_sync == B_TRUE);
+ return;
+ }
+
+ sav->sav_sync = B_TRUE;
+
+ if (nvlist_lookup_nvlist_array(sav->sav_config,
+ ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) {
+ VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
+ ZPOOL_CONFIG_SPARES, &aux, &naux) == 0);
+ }
+
+ ASSERT(c < naux);
+
+ /*
+ * Setting the nvlist in the middle if the array is a little
+ * sketchy, but it will work.
+ */
+ nvlist_free(aux[c]);
+ aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0);
+
+ return;
+ }
+
+ /*
+ * The dirty list is protected by the SCL_CONFIG lock. The caller
+ * must either hold SCL_CONFIG as writer, or must be the sync thread
+ * (which holds SCL_CONFIG as reader). There's only one sync thread,
+ * so this is sufficient to ensure mutual exclusion.
+ */
+ ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) ||
+ (dsl_pool_sync_context(spa_get_dsl(spa)) &&
+ spa_config_held(spa, SCL_CONFIG, RW_READER)));
+
+ if (vd == rvd) {
+ for (c = 0; c < rvd->vdev_children; c++)
+ vdev_config_dirty(rvd->vdev_child[c]);
+ } else {
+ ASSERT(vd == vd->vdev_top);
+
+ if (!list_link_active(&vd->vdev_config_dirty_node) &&
+ !vd->vdev_ishole)
+ list_insert_head(&spa->spa_config_dirty_list, vd);
+ }
+}
+
+void
+vdev_config_clean(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+
+ ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) ||
+ (dsl_pool_sync_context(spa_get_dsl(spa)) &&
+ spa_config_held(spa, SCL_CONFIG, RW_READER)));
+
+ ASSERT(list_link_active(&vd->vdev_config_dirty_node));
+ list_remove(&spa->spa_config_dirty_list, vd);
+}
+
+/*
+ * Mark a top-level vdev's state as dirty, so that the next pass of
+ * spa_sync() can convert this into vdev_config_dirty(). We distinguish
+ * the state changes from larger config changes because they require
+ * much less locking, and are often needed for administrative actions.
+ */
+void
+vdev_state_dirty(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+
+ ASSERT(spa_writeable(spa));
+ ASSERT(vd == vd->vdev_top);
+
+ /*
+ * The state list is protected by the SCL_STATE lock. The caller
+ * must either hold SCL_STATE as writer, or must be the sync thread
+ * (which holds SCL_STATE as reader). There's only one sync thread,
+ * so this is sufficient to ensure mutual exclusion.
+ */
+ ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) ||
+ (dsl_pool_sync_context(spa_get_dsl(spa)) &&
+ spa_config_held(spa, SCL_STATE, RW_READER)));
+
+ if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole)
+ list_insert_head(&spa->spa_state_dirty_list, vd);
+}
+
+void
+vdev_state_clean(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+
+ ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) ||
+ (dsl_pool_sync_context(spa_get_dsl(spa)) &&
+ spa_config_held(spa, SCL_STATE, RW_READER)));
+
+ ASSERT(list_link_active(&vd->vdev_state_dirty_node));
+ list_remove(&spa->spa_state_dirty_list, vd);
+}
+
+/*
+ * Propagate vdev state up from children to parent.
+ */
+void
+vdev_propagate_state(vdev_t *vd)
+{
+ spa_t *spa = vd->vdev_spa;
+ vdev_t *rvd = spa->spa_root_vdev;
+ int degraded = 0, faulted = 0;
+ int corrupted = 0;
+ vdev_t *child;
+
+ if (vd->vdev_children > 0) {
+ for (int c = 0; c < vd->vdev_children; c++) {
+ child = vd->vdev_child[c];
+
+ /*
+ * Don't factor holes into the decision.
+ */
+ if (child->vdev_ishole)
+ continue;
+
+ if (!vdev_readable(child) ||
+ (!vdev_writeable(child) && spa_writeable(spa))) {
+ /*
+ * Root special: if there is a top-level log
+ * device, treat the root vdev as if it were
+ * degraded.
+ */
+ if (child->vdev_islog && vd == rvd)
+ degraded++;
+ else
+ faulted++;
+ } else if (child->vdev_state <= VDEV_STATE_DEGRADED) {
+ degraded++;
+ }
+
+ if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA)
+ corrupted++;
+ }
+
+ vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded);
+
+ /*
+ * Root special: if there is a top-level vdev that cannot be
+ * opened due to corrupted metadata, then propagate the root
+ * vdev's aux state as 'corrupt' rather than 'insufficient
+ * replicas'.
+ */
+ if (corrupted && vd == rvd &&
+ rvd->vdev_state == VDEV_STATE_CANT_OPEN)
+ vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_CORRUPT_DATA);
+ }
+
+ if (vd->vdev_parent)
+ vdev_propagate_state(vd->vdev_parent);
+}
+
+/*
+ * Set a vdev's state. If this is during an open, we don't update the parent
+ * state, because we're in the process of opening children depth-first.
+ * Otherwise, we propagate the change to the parent.
+ *
+ * If this routine places a device in a faulted state, an appropriate ereport is
+ * generated.
+ */
+void
+vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux)
+{
+ uint64_t save_state;
+ spa_t *spa = vd->vdev_spa;
+
+ if (state == vd->vdev_state) {
+ vd->vdev_stat.vs_aux = aux;
+ return;
+ }
+
+ save_state = vd->vdev_state;
+
+ vd->vdev_state = state;
+ vd->vdev_stat.vs_aux = aux;
+
+ /*
+ * If we are setting the vdev state to anything but an open state, then
+ * always close the underlying device unless the device has requested
+ * a delayed close (i.e. we're about to remove or fault the device).
+ * Otherwise, we keep accessible but invalid devices open forever.
+ * We don't call vdev_close() itself, because that implies some extra
+ * checks (offline, etc) that we don't want here. This is limited to
+ * leaf devices, because otherwise closing the device will affect other
+ * children.
+ */
+ if (!vd->vdev_delayed_close && vdev_is_dead(vd) &&
+ vd->vdev_ops->vdev_op_leaf)
+ vd->vdev_ops->vdev_op_close(vd);
+
+ /*
+ * If we have brought this vdev back into service, we need
+ * to notify fmd so that it can gracefully repair any outstanding
+ * cases due to a missing device. We do this in all cases, even those
+ * that probably don't correlate to a repaired fault. This is sure to
+ * catch all cases, and we let the zfs-retire agent sort it out. If
+ * this is a transient state it's OK, as the retire agent will
+ * double-check the state of the vdev before repairing it.
+ */
+ if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf &&
+ vd->vdev_prevstate != state)
+ zfs_post_state_change(spa, vd);
+
+ if (vd->vdev_removed &&
+ state == VDEV_STATE_CANT_OPEN &&
+ (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) {
+ /*
+ * If the previous state is set to VDEV_STATE_REMOVED, then this
+ * device was previously marked removed and someone attempted to
+ * reopen it. If this failed due to a nonexistent device, then
+ * keep the device in the REMOVED state. We also let this be if
+ * it is one of our special test online cases, which is only
+ * attempting to online the device and shouldn't generate an FMA
+ * fault.
+ */
+ vd->vdev_state = VDEV_STATE_REMOVED;
+ vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
+ } else if (state == VDEV_STATE_REMOVED) {
+ vd->vdev_removed = B_TRUE;
+ } else if (state == VDEV_STATE_CANT_OPEN) {
+ /*
+ * If we fail to open a vdev during an import or recovery, we
+ * mark it as "not available", which signifies that it was
+ * never there to begin with. Failure to open such a device
+ * is not considered an error.
+ */
+ if ((spa_load_state(spa) == SPA_LOAD_IMPORT ||
+ spa_load_state(spa) == SPA_LOAD_RECOVER) &&
+ vd->vdev_ops->vdev_op_leaf)
+ vd->vdev_not_present = 1;
+
+ /*
+ * Post the appropriate ereport. If the 'prevstate' field is
+ * set to something other than VDEV_STATE_UNKNOWN, it indicates
+ * that this is part of a vdev_reopen(). In this case, we don't
+ * want to post the ereport if the device was already in the
+ * CANT_OPEN state beforehand.
+ *
+ * If the 'checkremove' flag is set, then this is an attempt to
+ * online the device in response to an insertion event. If we
+ * hit this case, then we have detected an insertion event for a
+ * faulted or offline device that wasn't in the removed state.
+ * In this scenario, we don't post an ereport because we are
+ * about to replace the device, or attempt an online with
+ * vdev_forcefault, which will generate the fault for us.
+ */
+ if ((vd->vdev_prevstate != state || vd->vdev_forcefault) &&
+ !vd->vdev_not_present && !vd->vdev_checkremove &&
+ vd != spa->spa_root_vdev) {
+ const char *class;
+
+ switch (aux) {
+ case VDEV_AUX_OPEN_FAILED:
+ class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED;
+ break;
+ case VDEV_AUX_CORRUPT_DATA:
+ class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA;
+ break;
+ case VDEV_AUX_NO_REPLICAS:
+ class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS;
+ break;
+ case VDEV_AUX_BAD_GUID_SUM:
+ class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM;
+ break;
+ case VDEV_AUX_TOO_SMALL:
+ class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL;
+ break;
+ case VDEV_AUX_BAD_LABEL:
+ class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL;
+ break;
+ default:
+ class = FM_EREPORT_ZFS_DEVICE_UNKNOWN;
+ }
+
+ zfs_ereport_post(class, spa, vd, NULL, save_state, 0);
+ }
+
+ /* Erase any notion of persistent removed state */
+ vd->vdev_removed = B_FALSE;
+ } else {
+ vd->vdev_removed = B_FALSE;
+ }
+
+ if (!isopen && vd->vdev_parent)
+ vdev_propagate_state(vd->vdev_parent);
+}
+
+/*
+ * Check the vdev configuration to ensure that it's capable of supporting
+ * a root pool. Currently, we do not support RAID-Z or partial configuration.
+ * In addition, only a single top-level vdev is allowed and none of the leaves
+ * can be wholedisks.
+ */
+boolean_t
+vdev_is_bootable(vdev_t *vd)
+{
+ if (!vd->vdev_ops->vdev_op_leaf) {
+ char *vdev_type = vd->vdev_ops->vdev_op_type;
+
+ if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 &&
+ vd->vdev_children > 1) {
+ return (B_FALSE);
+ } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 ||
+ strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) {
+ return (B_FALSE);
+ }
+ } else if (vd->vdev_wholedisk == 1) {
+ return (B_FALSE);
+ }
+
+ for (int c = 0; c < vd->vdev_children; c++) {
+ if (!vdev_is_bootable(vd->vdev_child[c]))
+ return (B_FALSE);
+ }
+ return (B_TRUE);
+}
+
+/*
+ * Load the state from the original vdev tree (ovd) which
+ * we've retrieved from the MOS config object. If the original
+ * vdev was offline or faulted then we transfer that state to the
+ * device in the current vdev tree (nvd).
+ */
+void
+vdev_load_log_state(vdev_t *nvd, vdev_t *ovd)
+{
+ spa_t *spa = nvd->vdev_spa;
+
+ ASSERT(nvd->vdev_top->vdev_islog);
+ ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
+ ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid);
+
+ for (int c = 0; c < nvd->vdev_children; c++)
+ vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]);
+
+ if (nvd->vdev_ops->vdev_op_leaf) {
+ /*
+ * Restore the persistent vdev state
+ */
+ nvd->vdev_offline = ovd->vdev_offline;
+ nvd->vdev_faulted = ovd->vdev_faulted;
+ nvd->vdev_degraded = ovd->vdev_degraded;
+ nvd->vdev_removed = ovd->vdev_removed;
+ }
+}
+
+/*
+ * Determine if a log device has valid content. If the vdev was
+ * removed or faulted in the MOS config then we know that
+ * the content on the log device has already been written to the pool.
+ */
+boolean_t
+vdev_log_state_valid(vdev_t *vd)
+{
+ if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted &&
+ !vd->vdev_removed)
+ return (B_TRUE);
+
+ for (int c = 0; c < vd->vdev_children; c++)
+ if (vdev_log_state_valid(vd->vdev_child[c]))
+ return (B_TRUE);
+
+ return (B_FALSE);
+}
+
+/*
+ * Expand a vdev if possible.
+ */
+void
+vdev_expand(vdev_t *vd, uint64_t txg)
+{
+ ASSERT(vd->vdev_top == vd);
+ ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
+
+ if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) {
+ VERIFY(vdev_metaslab_init(vd, txg) == 0);
+ vdev_config_dirty(vd);
+ }
+}
+
+/*
+ * Split a vdev.
+ */
+void
+vdev_split(vdev_t *vd)
+{
+ vdev_t *cvd, *pvd = vd->vdev_parent;
+
+ vdev_remove_child(pvd, vd);
+ vdev_compact_children(pvd);
+
+ cvd = pvd->vdev_child[0];
+ if (pvd->vdev_children == 1) {
+ vdev_remove_parent(cvd);
+ cvd->vdev_splitting = B_TRUE;
+ }
+ vdev_propagate_state(cvd);
+}