4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
28 #include <sys/zfs_context.h>
29 #include <sys/fm/fs/zfs.h>
31 #include <sys/spa_impl.h>
33 #include <sys/dmu_tx.h>
34 #include <sys/vdev_impl.h>
35 #include <sys/uberblock_impl.h>
36 #include <sys/metaslab.h>
37 #include <sys/metaslab_impl.h>
38 #include <sys/space_map.h>
39 #include <sys/space_reftree.h>
42 #include <sys/fs/zfs.h>
45 #include <sys/dsl_scan.h>
48 #include <sys/zfs_ratelimit.h>
51 * When a vdev is added, it will be divided into approximately (but no
52 * more than) this number of metaslabs.
54 int metaslabs_per_vdev = 200;
57 * Virtual device management.
60 static vdev_ops_t *vdev_ops_table[] = {
74 * Given a vdev type, return the appropriate ops vector.
77 vdev_getops(const char *type)
79 vdev_ops_t *ops, **opspp;
81 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++)
82 if (strcmp(ops->vdev_op_type, type) == 0)
89 * Default asize function: return the MAX of psize with the asize of
90 * all children. This is what's used by anything other than RAID-Z.
93 vdev_default_asize(vdev_t *vd, uint64_t psize)
95 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift);
99 for (c = 0; c < vd->vdev_children; c++) {
100 csize = vdev_psize_to_asize(vd->vdev_child[c], psize);
101 asize = MAX(asize, csize);
108 * Get the minimum allocatable size. We define the allocatable size as
109 * the vdev's asize rounded to the nearest metaslab. This allows us to
110 * replace or attach devices which don't have the same physical size but
111 * can still satisfy the same number of allocations.
114 vdev_get_min_asize(vdev_t *vd)
116 vdev_t *pvd = vd->vdev_parent;
119 * If our parent is NULL (inactive spare or cache) or is the root,
120 * just return our own asize.
123 return (vd->vdev_asize);
126 * The top-level vdev just returns the allocatable size rounded
127 * to the nearest metaslab.
129 if (vd == vd->vdev_top)
130 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift));
133 * The allocatable space for a raidz vdev is N * sizeof(smallest child),
134 * so each child must provide at least 1/Nth of its asize.
136 if (pvd->vdev_ops == &vdev_raidz_ops)
137 return (pvd->vdev_min_asize / pvd->vdev_children);
139 return (pvd->vdev_min_asize);
143 vdev_set_min_asize(vdev_t *vd)
146 vd->vdev_min_asize = vdev_get_min_asize(vd);
148 for (c = 0; c < vd->vdev_children; c++)
149 vdev_set_min_asize(vd->vdev_child[c]);
153 vdev_lookup_top(spa_t *spa, uint64_t vdev)
155 vdev_t *rvd = spa->spa_root_vdev;
157 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
159 if (vdev < rvd->vdev_children) {
160 ASSERT(rvd->vdev_child[vdev] != NULL);
161 return (rvd->vdev_child[vdev]);
168 vdev_lookup_by_guid(vdev_t *vd, uint64_t guid)
173 if (vd->vdev_guid == guid)
176 for (c = 0; c < vd->vdev_children; c++)
177 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) !=
185 vdev_count_leaves_impl(vdev_t *vd)
190 if (vd->vdev_ops->vdev_op_leaf)
193 for (c = 0; c < vd->vdev_children; c++)
194 n += vdev_count_leaves_impl(vd->vdev_child[c]);
200 vdev_count_leaves(spa_t *spa)
202 return (vdev_count_leaves_impl(spa->spa_root_vdev));
206 vdev_add_child(vdev_t *pvd, vdev_t *cvd)
208 size_t oldsize, newsize;
209 uint64_t id = cvd->vdev_id;
212 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
213 ASSERT(cvd->vdev_parent == NULL);
215 cvd->vdev_parent = pvd;
220 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL);
222 oldsize = pvd->vdev_children * sizeof (vdev_t *);
223 pvd->vdev_children = MAX(pvd->vdev_children, id + 1);
224 newsize = pvd->vdev_children * sizeof (vdev_t *);
226 newchild = kmem_alloc(newsize, KM_SLEEP);
227 if (pvd->vdev_child != NULL) {
228 bcopy(pvd->vdev_child, newchild, oldsize);
229 kmem_free(pvd->vdev_child, oldsize);
232 pvd->vdev_child = newchild;
233 pvd->vdev_child[id] = cvd;
235 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd);
236 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL);
239 * Walk up all ancestors to update guid sum.
241 for (; pvd != NULL; pvd = pvd->vdev_parent)
242 pvd->vdev_guid_sum += cvd->vdev_guid_sum;
246 vdev_remove_child(vdev_t *pvd, vdev_t *cvd)
249 uint_t id = cvd->vdev_id;
251 ASSERT(cvd->vdev_parent == pvd);
256 ASSERT(id < pvd->vdev_children);
257 ASSERT(pvd->vdev_child[id] == cvd);
259 pvd->vdev_child[id] = NULL;
260 cvd->vdev_parent = NULL;
262 for (c = 0; c < pvd->vdev_children; c++)
263 if (pvd->vdev_child[c])
266 if (c == pvd->vdev_children) {
267 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *));
268 pvd->vdev_child = NULL;
269 pvd->vdev_children = 0;
273 * Walk up all ancestors to update guid sum.
275 for (; pvd != NULL; pvd = pvd->vdev_parent)
276 pvd->vdev_guid_sum -= cvd->vdev_guid_sum;
280 * Remove any holes in the child array.
283 vdev_compact_children(vdev_t *pvd)
285 vdev_t **newchild, *cvd;
286 int oldc = pvd->vdev_children;
290 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
292 for (c = newc = 0; c < oldc; c++)
293 if (pvd->vdev_child[c])
296 newchild = kmem_zalloc(newc * sizeof (vdev_t *), KM_SLEEP);
298 for (c = newc = 0; c < oldc; c++) {
299 if ((cvd = pvd->vdev_child[c]) != NULL) {
300 newchild[newc] = cvd;
301 cvd->vdev_id = newc++;
305 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *));
306 pvd->vdev_child = newchild;
307 pvd->vdev_children = newc;
311 * Allocate and minimally initialize a vdev_t.
314 vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops)
319 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP);
321 if (spa->spa_root_vdev == NULL) {
322 ASSERT(ops == &vdev_root_ops);
323 spa->spa_root_vdev = vd;
324 spa->spa_load_guid = spa_generate_guid(NULL);
327 if (guid == 0 && ops != &vdev_hole_ops) {
328 if (spa->spa_root_vdev == vd) {
330 * The root vdev's guid will also be the pool guid,
331 * which must be unique among all pools.
333 guid = spa_generate_guid(NULL);
336 * Any other vdev's guid must be unique within the pool.
338 guid = spa_generate_guid(spa);
340 ASSERT(!spa_guid_exists(spa_guid(spa), guid));
345 vd->vdev_guid = guid;
346 vd->vdev_guid_sum = guid;
348 vd->vdev_state = VDEV_STATE_CLOSED;
349 vd->vdev_ishole = (ops == &vdev_hole_ops);
352 * Initialize rate limit structs for events. We rate limit ZIO delay
353 * and checksum events so that we don't overwhelm ZED with thousands
354 * of events when a disk is acting up.
356 zfs_ratelimit_init(&vd->vdev_delay_rl, DELAYS_PER_SECOND, 1);
357 zfs_ratelimit_init(&vd->vdev_checksum_rl, CHECKSUMS_PER_SECOND, 1);
359 list_link_init(&vd->vdev_config_dirty_node);
360 list_link_init(&vd->vdev_state_dirty_node);
361 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_NOLOCKDEP, NULL);
362 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL);
363 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL);
364 mutex_init(&vd->vdev_queue_lock, NULL, MUTEX_DEFAULT, NULL);
366 for (t = 0; t < DTL_TYPES; t++) {
367 vd->vdev_dtl[t] = range_tree_create(NULL, NULL,
370 txg_list_create(&vd->vdev_ms_list,
371 offsetof(struct metaslab, ms_txg_node));
372 txg_list_create(&vd->vdev_dtl_list,
373 offsetof(struct vdev, vdev_dtl_node));
374 vd->vdev_stat.vs_timestamp = gethrtime();
382 * Allocate a new vdev. The 'alloctype' is used to control whether we are
383 * creating a new vdev or loading an existing one - the behavior is slightly
384 * different for each case.
387 vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id,
392 uint64_t guid = 0, islog, nparity;
395 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
397 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0)
398 return (SET_ERROR(EINVAL));
400 if ((ops = vdev_getops(type)) == NULL)
401 return (SET_ERROR(EINVAL));
404 * If this is a load, get the vdev guid from the nvlist.
405 * Otherwise, vdev_alloc_common() will generate one for us.
407 if (alloctype == VDEV_ALLOC_LOAD) {
410 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) ||
412 return (SET_ERROR(EINVAL));
414 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
415 return (SET_ERROR(EINVAL));
416 } else if (alloctype == VDEV_ALLOC_SPARE) {
417 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
418 return (SET_ERROR(EINVAL));
419 } else if (alloctype == VDEV_ALLOC_L2CACHE) {
420 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
421 return (SET_ERROR(EINVAL));
422 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) {
423 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
424 return (SET_ERROR(EINVAL));
428 * The first allocated vdev must be of type 'root'.
430 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL)
431 return (SET_ERROR(EINVAL));
434 * Determine whether we're a log vdev.
437 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog);
438 if (islog && spa_version(spa) < SPA_VERSION_SLOGS)
439 return (SET_ERROR(ENOTSUP));
441 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES)
442 return (SET_ERROR(ENOTSUP));
445 * Set the nparity property for RAID-Z vdevs.
448 if (ops == &vdev_raidz_ops) {
449 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY,
451 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY)
452 return (SET_ERROR(EINVAL));
454 * Previous versions could only support 1 or 2 parity
458 spa_version(spa) < SPA_VERSION_RAIDZ2)
459 return (SET_ERROR(ENOTSUP));
461 spa_version(spa) < SPA_VERSION_RAIDZ3)
462 return (SET_ERROR(ENOTSUP));
465 * We require the parity to be specified for SPAs that
466 * support multiple parity levels.
468 if (spa_version(spa) >= SPA_VERSION_RAIDZ2)
469 return (SET_ERROR(EINVAL));
471 * Otherwise, we default to 1 parity device for RAID-Z.
478 ASSERT(nparity != -1ULL);
480 vd = vdev_alloc_common(spa, id, guid, ops);
482 vd->vdev_islog = islog;
483 vd->vdev_nparity = nparity;
485 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0)
486 vd->vdev_path = spa_strdup(vd->vdev_path);
487 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0)
488 vd->vdev_devid = spa_strdup(vd->vdev_devid);
489 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH,
490 &vd->vdev_physpath) == 0)
491 vd->vdev_physpath = spa_strdup(vd->vdev_physpath);
493 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_VDEV_ENC_SYSFS_PATH,
494 &vd->vdev_enc_sysfs_path) == 0)
495 vd->vdev_enc_sysfs_path = spa_strdup(vd->vdev_enc_sysfs_path);
497 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0)
498 vd->vdev_fru = spa_strdup(vd->vdev_fru);
501 * Set the whole_disk property. If it's not specified, leave the value
504 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
505 &vd->vdev_wholedisk) != 0)
506 vd->vdev_wholedisk = -1ULL;
509 * Look for the 'not present' flag. This will only be set if the device
510 * was not present at the time of import.
512 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
513 &vd->vdev_not_present);
516 * Get the alignment requirement.
518 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift);
521 * Retrieve the vdev creation time.
523 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG,
527 * If we're a top-level vdev, try to load the allocation parameters.
529 if (parent && !parent->vdev_parent &&
530 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) {
531 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY,
533 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT,
535 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE,
537 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING,
539 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_VDEV_TOP_ZAP,
542 ASSERT0(vd->vdev_top_zap);
545 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) {
546 ASSERT(alloctype == VDEV_ALLOC_LOAD ||
547 alloctype == VDEV_ALLOC_ADD ||
548 alloctype == VDEV_ALLOC_SPLIT ||
549 alloctype == VDEV_ALLOC_ROOTPOOL);
550 vd->vdev_mg = metaslab_group_create(islog ?
551 spa_log_class(spa) : spa_normal_class(spa), vd);
554 if (vd->vdev_ops->vdev_op_leaf &&
555 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) {
556 (void) nvlist_lookup_uint64(nv,
557 ZPOOL_CONFIG_VDEV_LEAF_ZAP, &vd->vdev_leaf_zap);
559 ASSERT0(vd->vdev_leaf_zap);
563 * If we're a leaf vdev, try to load the DTL object and other state.
566 if (vd->vdev_ops->vdev_op_leaf &&
567 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE ||
568 alloctype == VDEV_ALLOC_ROOTPOOL)) {
569 if (alloctype == VDEV_ALLOC_LOAD) {
570 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL,
571 &vd->vdev_dtl_object);
572 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE,
576 if (alloctype == VDEV_ALLOC_ROOTPOOL) {
579 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE,
580 &spare) == 0 && spare)
584 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE,
587 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG,
588 &vd->vdev_resilver_txg);
591 * When importing a pool, we want to ignore the persistent fault
592 * state, as the diagnosis made on another system may not be
593 * valid in the current context. Local vdevs will
594 * remain in the faulted state.
596 if (spa_load_state(spa) == SPA_LOAD_OPEN) {
597 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED,
599 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED,
601 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED,
604 if (vd->vdev_faulted || vd->vdev_degraded) {
608 VDEV_AUX_ERR_EXCEEDED;
609 if (nvlist_lookup_string(nv,
610 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 &&
611 strcmp(aux, "external") == 0)
612 vd->vdev_label_aux = VDEV_AUX_EXTERNAL;
618 * Add ourselves to the parent's list of children.
620 vdev_add_child(parent, vd);
628 vdev_free(vdev_t *vd)
631 spa_t *spa = vd->vdev_spa;
634 * vdev_free() implies closing the vdev first. This is simpler than
635 * trying to ensure complicated semantics for all callers.
639 ASSERT(!list_link_active(&vd->vdev_config_dirty_node));
640 ASSERT(!list_link_active(&vd->vdev_state_dirty_node));
645 for (c = 0; c < vd->vdev_children; c++)
646 vdev_free(vd->vdev_child[c]);
648 ASSERT(vd->vdev_child == NULL);
649 ASSERT(vd->vdev_guid_sum == vd->vdev_guid);
652 * Discard allocation state.
654 if (vd->vdev_mg != NULL) {
655 vdev_metaslab_fini(vd);
656 metaslab_group_destroy(vd->vdev_mg);
659 ASSERT0(vd->vdev_stat.vs_space);
660 ASSERT0(vd->vdev_stat.vs_dspace);
661 ASSERT0(vd->vdev_stat.vs_alloc);
664 * Remove this vdev from its parent's child list.
666 vdev_remove_child(vd->vdev_parent, vd);
668 ASSERT(vd->vdev_parent == NULL);
671 * Clean up vdev structure.
677 spa_strfree(vd->vdev_path);
679 spa_strfree(vd->vdev_devid);
680 if (vd->vdev_physpath)
681 spa_strfree(vd->vdev_physpath);
683 if (vd->vdev_enc_sysfs_path)
684 spa_strfree(vd->vdev_enc_sysfs_path);
687 spa_strfree(vd->vdev_fru);
689 if (vd->vdev_isspare)
690 spa_spare_remove(vd);
691 if (vd->vdev_isl2cache)
692 spa_l2cache_remove(vd);
694 txg_list_destroy(&vd->vdev_ms_list);
695 txg_list_destroy(&vd->vdev_dtl_list);
697 mutex_enter(&vd->vdev_dtl_lock);
698 space_map_close(vd->vdev_dtl_sm);
699 for (t = 0; t < DTL_TYPES; t++) {
700 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL);
701 range_tree_destroy(vd->vdev_dtl[t]);
703 mutex_exit(&vd->vdev_dtl_lock);
705 mutex_destroy(&vd->vdev_queue_lock);
706 mutex_destroy(&vd->vdev_dtl_lock);
707 mutex_destroy(&vd->vdev_stat_lock);
708 mutex_destroy(&vd->vdev_probe_lock);
710 if (vd == spa->spa_root_vdev)
711 spa->spa_root_vdev = NULL;
713 kmem_free(vd, sizeof (vdev_t));
717 * Transfer top-level vdev state from svd to tvd.
720 vdev_top_transfer(vdev_t *svd, vdev_t *tvd)
722 spa_t *spa = svd->vdev_spa;
727 ASSERT(tvd == tvd->vdev_top);
729 tvd->vdev_pending_fastwrite = svd->vdev_pending_fastwrite;
730 tvd->vdev_ms_array = svd->vdev_ms_array;
731 tvd->vdev_ms_shift = svd->vdev_ms_shift;
732 tvd->vdev_ms_count = svd->vdev_ms_count;
733 tvd->vdev_top_zap = svd->vdev_top_zap;
735 svd->vdev_ms_array = 0;
736 svd->vdev_ms_shift = 0;
737 svd->vdev_ms_count = 0;
738 svd->vdev_top_zap = 0;
741 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg);
742 tvd->vdev_mg = svd->vdev_mg;
743 tvd->vdev_ms = svd->vdev_ms;
748 if (tvd->vdev_mg != NULL)
749 tvd->vdev_mg->mg_vd = tvd;
751 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc;
752 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space;
753 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace;
755 svd->vdev_stat.vs_alloc = 0;
756 svd->vdev_stat.vs_space = 0;
757 svd->vdev_stat.vs_dspace = 0;
759 for (t = 0; t < TXG_SIZE; t++) {
760 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL)
761 (void) txg_list_add(&tvd->vdev_ms_list, msp, t);
762 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL)
763 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t);
764 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t))
765 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t);
768 if (list_link_active(&svd->vdev_config_dirty_node)) {
769 vdev_config_clean(svd);
770 vdev_config_dirty(tvd);
773 if (list_link_active(&svd->vdev_state_dirty_node)) {
774 vdev_state_clean(svd);
775 vdev_state_dirty(tvd);
778 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio;
779 svd->vdev_deflate_ratio = 0;
781 tvd->vdev_islog = svd->vdev_islog;
786 vdev_top_update(vdev_t *tvd, vdev_t *vd)
795 for (c = 0; c < vd->vdev_children; c++)
796 vdev_top_update(tvd, vd->vdev_child[c]);
800 * Add a mirror/replacing vdev above an existing vdev.
803 vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops)
805 spa_t *spa = cvd->vdev_spa;
806 vdev_t *pvd = cvd->vdev_parent;
809 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
811 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops);
813 mvd->vdev_asize = cvd->vdev_asize;
814 mvd->vdev_min_asize = cvd->vdev_min_asize;
815 mvd->vdev_max_asize = cvd->vdev_max_asize;
816 mvd->vdev_ashift = cvd->vdev_ashift;
817 mvd->vdev_state = cvd->vdev_state;
818 mvd->vdev_crtxg = cvd->vdev_crtxg;
820 vdev_remove_child(pvd, cvd);
821 vdev_add_child(pvd, mvd);
822 cvd->vdev_id = mvd->vdev_children;
823 vdev_add_child(mvd, cvd);
824 vdev_top_update(cvd->vdev_top, cvd->vdev_top);
826 if (mvd == mvd->vdev_top)
827 vdev_top_transfer(cvd, mvd);
833 * Remove a 1-way mirror/replacing vdev from the tree.
836 vdev_remove_parent(vdev_t *cvd)
838 vdev_t *mvd = cvd->vdev_parent;
839 vdev_t *pvd = mvd->vdev_parent;
841 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
843 ASSERT(mvd->vdev_children == 1);
844 ASSERT(mvd->vdev_ops == &vdev_mirror_ops ||
845 mvd->vdev_ops == &vdev_replacing_ops ||
846 mvd->vdev_ops == &vdev_spare_ops);
847 cvd->vdev_ashift = mvd->vdev_ashift;
849 vdev_remove_child(mvd, cvd);
850 vdev_remove_child(pvd, mvd);
853 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
854 * Otherwise, we could have detached an offline device, and when we
855 * go to import the pool we'll think we have two top-level vdevs,
856 * instead of a different version of the same top-level vdev.
858 if (mvd->vdev_top == mvd) {
859 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid;
860 cvd->vdev_orig_guid = cvd->vdev_guid;
861 cvd->vdev_guid += guid_delta;
862 cvd->vdev_guid_sum += guid_delta;
865 * If pool not set for autoexpand, we need to also preserve
866 * mvd's asize to prevent automatic expansion of cvd.
867 * Otherwise if we are adjusting the mirror by attaching and
868 * detaching children of non-uniform sizes, the mirror could
869 * autoexpand, unexpectedly requiring larger devices to
870 * re-establish the mirror.
872 if (!cvd->vdev_spa->spa_autoexpand)
873 cvd->vdev_asize = mvd->vdev_asize;
875 cvd->vdev_id = mvd->vdev_id;
876 vdev_add_child(pvd, cvd);
877 vdev_top_update(cvd->vdev_top, cvd->vdev_top);
879 if (cvd == cvd->vdev_top)
880 vdev_top_transfer(mvd, cvd);
882 ASSERT(mvd->vdev_children == 0);
887 vdev_metaslab_init(vdev_t *vd, uint64_t txg)
889 spa_t *spa = vd->vdev_spa;
890 objset_t *mos = spa->spa_meta_objset;
892 uint64_t oldc = vd->vdev_ms_count;
893 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift;
897 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER));
900 * This vdev is not being allocated from yet or is a hole.
902 if (vd->vdev_ms_shift == 0)
905 ASSERT(!vd->vdev_ishole);
908 * Compute the raidz-deflation ratio. Note, we hard-code
909 * in 128k (1 << 17) because it is the "typical" blocksize.
910 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change,
911 * otherwise it would inconsistently account for existing bp's.
913 vd->vdev_deflate_ratio = (1 << 17) /
914 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT);
916 ASSERT(oldc <= newc);
918 mspp = vmem_zalloc(newc * sizeof (*mspp), KM_SLEEP);
921 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp));
922 vmem_free(vd->vdev_ms, oldc * sizeof (*mspp));
926 vd->vdev_ms_count = newc;
928 for (m = oldc; m < newc; m++) {
932 error = dmu_read(mos, vd->vdev_ms_array,
933 m * sizeof (uint64_t), sizeof (uint64_t), &object,
939 error = metaslab_init(vd->vdev_mg, m, object, txg,
946 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER);
949 * If the vdev is being removed we don't activate
950 * the metaslabs since we want to ensure that no new
951 * allocations are performed on this device.
953 if (oldc == 0 && !vd->vdev_removing)
954 metaslab_group_activate(vd->vdev_mg);
957 spa_config_exit(spa, SCL_ALLOC, FTAG);
963 vdev_metaslab_fini(vdev_t *vd)
966 uint64_t count = vd->vdev_ms_count;
968 if (vd->vdev_ms != NULL) {
969 metaslab_group_passivate(vd->vdev_mg);
970 for (m = 0; m < count; m++) {
971 metaslab_t *msp = vd->vdev_ms[m];
976 vmem_free(vd->vdev_ms, count * sizeof (metaslab_t *));
980 ASSERT3U(vd->vdev_pending_fastwrite, ==, 0);
983 typedef struct vdev_probe_stats {
984 boolean_t vps_readable;
985 boolean_t vps_writeable;
987 } vdev_probe_stats_t;
990 vdev_probe_done(zio_t *zio)
992 spa_t *spa = zio->io_spa;
993 vdev_t *vd = zio->io_vd;
994 vdev_probe_stats_t *vps = zio->io_private;
996 ASSERT(vd->vdev_probe_zio != NULL);
998 if (zio->io_type == ZIO_TYPE_READ) {
999 if (zio->io_error == 0)
1000 vps->vps_readable = 1;
1001 if (zio->io_error == 0 && spa_writeable(spa)) {
1002 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd,
1003 zio->io_offset, zio->io_size, zio->io_abd,
1004 ZIO_CHECKSUM_OFF, vdev_probe_done, vps,
1005 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE));
1007 abd_free(zio->io_abd);
1009 } else if (zio->io_type == ZIO_TYPE_WRITE) {
1010 if (zio->io_error == 0)
1011 vps->vps_writeable = 1;
1012 abd_free(zio->io_abd);
1013 } else if (zio->io_type == ZIO_TYPE_NULL) {
1017 vd->vdev_cant_read |= !vps->vps_readable;
1018 vd->vdev_cant_write |= !vps->vps_writeable;
1020 if (vdev_readable(vd) &&
1021 (vdev_writeable(vd) || !spa_writeable(spa))) {
1024 ASSERT(zio->io_error != 0);
1025 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE,
1026 spa, vd, NULL, 0, 0);
1027 zio->io_error = SET_ERROR(ENXIO);
1030 mutex_enter(&vd->vdev_probe_lock);
1031 ASSERT(vd->vdev_probe_zio == zio);
1032 vd->vdev_probe_zio = NULL;
1033 mutex_exit(&vd->vdev_probe_lock);
1036 while ((pio = zio_walk_parents(zio, &zl)) != NULL)
1037 if (!vdev_accessible(vd, pio))
1038 pio->io_error = SET_ERROR(ENXIO);
1040 kmem_free(vps, sizeof (*vps));
1045 * Determine whether this device is accessible.
1047 * Read and write to several known locations: the pad regions of each
1048 * vdev label but the first, which we leave alone in case it contains
1052 vdev_probe(vdev_t *vd, zio_t *zio)
1054 spa_t *spa = vd->vdev_spa;
1055 vdev_probe_stats_t *vps = NULL;
1059 ASSERT(vd->vdev_ops->vdev_op_leaf);
1062 * Don't probe the probe.
1064 if (zio && (zio->io_flags & ZIO_FLAG_PROBE))
1068 * To prevent 'probe storms' when a device fails, we create
1069 * just one probe i/o at a time. All zios that want to probe
1070 * this vdev will become parents of the probe io.
1072 mutex_enter(&vd->vdev_probe_lock);
1074 if ((pio = vd->vdev_probe_zio) == NULL) {
1075 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP);
1077 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE |
1078 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE |
1081 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) {
1083 * vdev_cant_read and vdev_cant_write can only
1084 * transition from TRUE to FALSE when we have the
1085 * SCL_ZIO lock as writer; otherwise they can only
1086 * transition from FALSE to TRUE. This ensures that
1087 * any zio looking at these values can assume that
1088 * failures persist for the life of the I/O. That's
1089 * important because when a device has intermittent
1090 * connectivity problems, we want to ensure that
1091 * they're ascribed to the device (ENXIO) and not
1094 * Since we hold SCL_ZIO as writer here, clear both
1095 * values so the probe can reevaluate from first
1098 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER;
1099 vd->vdev_cant_read = B_FALSE;
1100 vd->vdev_cant_write = B_FALSE;
1103 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd,
1104 vdev_probe_done, vps,
1105 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE);
1108 * We can't change the vdev state in this context, so we
1109 * kick off an async task to do it on our behalf.
1112 vd->vdev_probe_wanted = B_TRUE;
1113 spa_async_request(spa, SPA_ASYNC_PROBE);
1118 zio_add_child(zio, pio);
1120 mutex_exit(&vd->vdev_probe_lock);
1123 ASSERT(zio != NULL);
1127 for (l = 1; l < VDEV_LABELS; l++) {
1128 zio_nowait(zio_read_phys(pio, vd,
1129 vdev_label_offset(vd->vdev_psize, l,
1130 offsetof(vdev_label_t, vl_pad2)), VDEV_PAD_SIZE,
1131 abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE),
1132 ZIO_CHECKSUM_OFF, vdev_probe_done, vps,
1133 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE));
1144 vdev_open_child(void *arg)
1148 vd->vdev_open_thread = curthread;
1149 vd->vdev_open_error = vdev_open(vd);
1150 vd->vdev_open_thread = NULL;
1154 vdev_uses_zvols(vdev_t *vd)
1159 if (zvol_is_zvol(vd->vdev_path))
1163 for (c = 0; c < vd->vdev_children; c++)
1164 if (vdev_uses_zvols(vd->vdev_child[c]))
1171 vdev_open_children(vdev_t *vd)
1174 int children = vd->vdev_children;
1178 * in order to handle pools on top of zvols, do the opens
1179 * in a single thread so that the same thread holds the
1180 * spa_namespace_lock
1182 if (vdev_uses_zvols(vd)) {
1184 for (c = 0; c < children; c++)
1185 vd->vdev_child[c]->vdev_open_error =
1186 vdev_open(vd->vdev_child[c]);
1188 tq = taskq_create("vdev_open", children, minclsyspri,
1189 children, children, TASKQ_PREPOPULATE);
1193 for (c = 0; c < children; c++)
1194 VERIFY(taskq_dispatch(tq, vdev_open_child,
1195 vd->vdev_child[c], TQ_SLEEP) != TASKQID_INVALID);
1200 vd->vdev_nonrot = B_TRUE;
1202 for (c = 0; c < children; c++)
1203 vd->vdev_nonrot &= vd->vdev_child[c]->vdev_nonrot;
1207 * Prepare a virtual device for access.
1210 vdev_open(vdev_t *vd)
1212 spa_t *spa = vd->vdev_spa;
1215 uint64_t max_osize = 0;
1216 uint64_t asize, max_asize, psize;
1217 uint64_t ashift = 0;
1220 ASSERT(vd->vdev_open_thread == curthread ||
1221 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1222 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED ||
1223 vd->vdev_state == VDEV_STATE_CANT_OPEN ||
1224 vd->vdev_state == VDEV_STATE_OFFLINE);
1226 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
1227 vd->vdev_cant_read = B_FALSE;
1228 vd->vdev_cant_write = B_FALSE;
1229 vd->vdev_min_asize = vdev_get_min_asize(vd);
1232 * If this vdev is not removed, check its fault status. If it's
1233 * faulted, bail out of the open.
1235 if (!vd->vdev_removed && vd->vdev_faulted) {
1236 ASSERT(vd->vdev_children == 0);
1237 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED ||
1238 vd->vdev_label_aux == VDEV_AUX_EXTERNAL);
1239 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1240 vd->vdev_label_aux);
1241 return (SET_ERROR(ENXIO));
1242 } else if (vd->vdev_offline) {
1243 ASSERT(vd->vdev_children == 0);
1244 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE);
1245 return (SET_ERROR(ENXIO));
1248 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, &ashift);
1251 * Reset the vdev_reopening flag so that we actually close
1252 * the vdev on error.
1254 vd->vdev_reopening = B_FALSE;
1255 if (zio_injection_enabled && error == 0)
1256 error = zio_handle_device_injection(vd, NULL, ENXIO);
1259 if (vd->vdev_removed &&
1260 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED)
1261 vd->vdev_removed = B_FALSE;
1263 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1264 vd->vdev_stat.vs_aux);
1268 vd->vdev_removed = B_FALSE;
1271 * Recheck the faulted flag now that we have confirmed that
1272 * the vdev is accessible. If we're faulted, bail.
1274 if (vd->vdev_faulted) {
1275 ASSERT(vd->vdev_children == 0);
1276 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED ||
1277 vd->vdev_label_aux == VDEV_AUX_EXTERNAL);
1278 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1279 vd->vdev_label_aux);
1280 return (SET_ERROR(ENXIO));
1283 if (vd->vdev_degraded) {
1284 ASSERT(vd->vdev_children == 0);
1285 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED,
1286 VDEV_AUX_ERR_EXCEEDED);
1288 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0);
1292 * For hole or missing vdevs we just return success.
1294 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops)
1297 for (c = 0; c < vd->vdev_children; c++) {
1298 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) {
1299 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED,
1305 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t));
1306 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t));
1308 if (vd->vdev_children == 0) {
1309 if (osize < SPA_MINDEVSIZE) {
1310 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1311 VDEV_AUX_TOO_SMALL);
1312 return (SET_ERROR(EOVERFLOW));
1315 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE);
1316 max_asize = max_osize - (VDEV_LABEL_START_SIZE +
1317 VDEV_LABEL_END_SIZE);
1319 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE -
1320 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) {
1321 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1322 VDEV_AUX_TOO_SMALL);
1323 return (SET_ERROR(EOVERFLOW));
1327 max_asize = max_osize;
1330 vd->vdev_psize = psize;
1333 * Make sure the allocatable size hasn't shrunk.
1335 if (asize < vd->vdev_min_asize) {
1336 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1337 VDEV_AUX_BAD_LABEL);
1338 return (SET_ERROR(EINVAL));
1341 if (vd->vdev_asize == 0) {
1343 * This is the first-ever open, so use the computed values.
1344 * For compatibility, a different ashift can be requested.
1346 vd->vdev_asize = asize;
1347 vd->vdev_max_asize = max_asize;
1348 if (vd->vdev_ashift == 0)
1349 vd->vdev_ashift = ashift;
1352 * Detect if the alignment requirement has increased.
1353 * We don't want to make the pool unavailable, just
1354 * post an event instead.
1356 if (ashift > vd->vdev_top->vdev_ashift &&
1357 vd->vdev_ops->vdev_op_leaf) {
1358 zfs_ereport_post(FM_EREPORT_ZFS_DEVICE_BAD_ASHIFT,
1359 spa, vd, NULL, 0, 0);
1362 vd->vdev_max_asize = max_asize;
1366 * If all children are healthy and the asize has increased,
1367 * then we've experienced dynamic LUN growth. If automatic
1368 * expansion is enabled then use the additional space.
1370 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize &&
1371 (vd->vdev_expanding || spa->spa_autoexpand))
1372 vd->vdev_asize = asize;
1374 vdev_set_min_asize(vd);
1377 * Ensure we can issue some IO before declaring the
1378 * vdev open for business.
1380 if (vd->vdev_ops->vdev_op_leaf &&
1381 (error = zio_wait(vdev_probe(vd, NULL))) != 0) {
1382 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1383 VDEV_AUX_ERR_EXCEEDED);
1388 * Track the min and max ashift values for normal data devices.
1390 if (vd->vdev_top == vd && vd->vdev_ashift != 0 &&
1391 !vd->vdev_islog && vd->vdev_aux == NULL) {
1392 if (vd->vdev_ashift > spa->spa_max_ashift)
1393 spa->spa_max_ashift = vd->vdev_ashift;
1394 if (vd->vdev_ashift < spa->spa_min_ashift)
1395 spa->spa_min_ashift = vd->vdev_ashift;
1399 * If a leaf vdev has a DTL, and seems healthy, then kick off a
1400 * resilver. But don't do this if we are doing a reopen for a scrub,
1401 * since this would just restart the scrub we are already doing.
1403 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen &&
1404 vdev_resilver_needed(vd, NULL, NULL))
1405 spa_async_request(spa, SPA_ASYNC_RESILVER);
1411 * Called once the vdevs are all opened, this routine validates the label
1412 * contents. This needs to be done before vdev_load() so that we don't
1413 * inadvertently do repair I/Os to the wrong device.
1415 * If 'strict' is false ignore the spa guid check. This is necessary because
1416 * if the machine crashed during a re-guid the new guid might have been written
1417 * to all of the vdev labels, but not the cached config. The strict check
1418 * will be performed when the pool is opened again using the mos config.
1420 * This function will only return failure if one of the vdevs indicates that it
1421 * has since been destroyed or exported. This is only possible if
1422 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
1423 * will be updated but the function will return 0.
1426 vdev_validate(vdev_t *vd, boolean_t strict)
1428 spa_t *spa = vd->vdev_spa;
1430 uint64_t guid = 0, top_guid;
1434 for (c = 0; c < vd->vdev_children; c++)
1435 if (vdev_validate(vd->vdev_child[c], strict) != 0)
1436 return (SET_ERROR(EBADF));
1439 * If the device has already failed, or was marked offline, don't do
1440 * any further validation. Otherwise, label I/O will fail and we will
1441 * overwrite the previous state.
1443 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) {
1444 uint64_t aux_guid = 0;
1446 uint64_t txg = spa_last_synced_txg(spa) != 0 ?
1447 spa_last_synced_txg(spa) : -1ULL;
1449 if ((label = vdev_label_read_config(vd, txg)) == NULL) {
1450 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1451 VDEV_AUX_BAD_LABEL);
1456 * Determine if this vdev has been split off into another
1457 * pool. If so, then refuse to open it.
1459 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID,
1460 &aux_guid) == 0 && aux_guid == spa_guid(spa)) {
1461 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1462 VDEV_AUX_SPLIT_POOL);
1467 if (strict && (nvlist_lookup_uint64(label,
1468 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 ||
1469 guid != spa_guid(spa))) {
1470 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1471 VDEV_AUX_CORRUPT_DATA);
1476 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl)
1477 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID,
1482 * If this vdev just became a top-level vdev because its
1483 * sibling was detached, it will have adopted the parent's
1484 * vdev guid -- but the label may or may not be on disk yet.
1485 * Fortunately, either version of the label will have the
1486 * same top guid, so if we're a top-level vdev, we can
1487 * safely compare to that instead.
1489 * If we split this vdev off instead, then we also check the
1490 * original pool's guid. We don't want to consider the vdev
1491 * corrupt if it is partway through a split operation.
1493 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID,
1495 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID,
1497 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) &&
1498 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) {
1499 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1500 VDEV_AUX_CORRUPT_DATA);
1505 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE,
1507 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1508 VDEV_AUX_CORRUPT_DATA);
1516 * If this is a verbatim import, no need to check the
1517 * state of the pool.
1519 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) &&
1520 spa_load_state(spa) == SPA_LOAD_OPEN &&
1521 state != POOL_STATE_ACTIVE)
1522 return (SET_ERROR(EBADF));
1525 * If we were able to open and validate a vdev that was
1526 * previously marked permanently unavailable, clear that state
1529 if (vd->vdev_not_present)
1530 vd->vdev_not_present = 0;
1537 * Close a virtual device.
1540 vdev_close(vdev_t *vd)
1542 vdev_t *pvd = vd->vdev_parent;
1543 ASSERTV(spa_t *spa = vd->vdev_spa);
1545 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1548 * If our parent is reopening, then we are as well, unless we are
1551 if (pvd != NULL && pvd->vdev_reopening)
1552 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline);
1554 vd->vdev_ops->vdev_op_close(vd);
1556 vdev_cache_purge(vd);
1559 * We record the previous state before we close it, so that if we are
1560 * doing a reopen(), we don't generate FMA ereports if we notice that
1561 * it's still faulted.
1563 vd->vdev_prevstate = vd->vdev_state;
1565 if (vd->vdev_offline)
1566 vd->vdev_state = VDEV_STATE_OFFLINE;
1568 vd->vdev_state = VDEV_STATE_CLOSED;
1569 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
1573 vdev_hold(vdev_t *vd)
1575 spa_t *spa = vd->vdev_spa;
1578 ASSERT(spa_is_root(spa));
1579 if (spa->spa_state == POOL_STATE_UNINITIALIZED)
1582 for (c = 0; c < vd->vdev_children; c++)
1583 vdev_hold(vd->vdev_child[c]);
1585 if (vd->vdev_ops->vdev_op_leaf)
1586 vd->vdev_ops->vdev_op_hold(vd);
1590 vdev_rele(vdev_t *vd)
1594 ASSERT(spa_is_root(vd->vdev_spa));
1595 for (c = 0; c < vd->vdev_children; c++)
1596 vdev_rele(vd->vdev_child[c]);
1598 if (vd->vdev_ops->vdev_op_leaf)
1599 vd->vdev_ops->vdev_op_rele(vd);
1603 * Reopen all interior vdevs and any unopened leaves. We don't actually
1604 * reopen leaf vdevs which had previously been opened as they might deadlock
1605 * on the spa_config_lock. Instead we only obtain the leaf's physical size.
1606 * If the leaf has never been opened then open it, as usual.
1609 vdev_reopen(vdev_t *vd)
1611 spa_t *spa = vd->vdev_spa;
1613 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1615 /* set the reopening flag unless we're taking the vdev offline */
1616 vd->vdev_reopening = !vd->vdev_offline;
1618 (void) vdev_open(vd);
1621 * Call vdev_validate() here to make sure we have the same device.
1622 * Otherwise, a device with an invalid label could be successfully
1623 * opened in response to vdev_reopen().
1626 (void) vdev_validate_aux(vd);
1627 if (vdev_readable(vd) && vdev_writeable(vd) &&
1628 vd->vdev_aux == &spa->spa_l2cache &&
1629 !l2arc_vdev_present(vd))
1630 l2arc_add_vdev(spa, vd);
1632 (void) vdev_validate(vd, B_TRUE);
1636 * Reassess parent vdev's health.
1638 vdev_propagate_state(vd);
1642 vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing)
1647 * Normally, partial opens (e.g. of a mirror) are allowed.
1648 * For a create, however, we want to fail the request if
1649 * there are any components we can't open.
1651 error = vdev_open(vd);
1653 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) {
1655 return (error ? error : ENXIO);
1659 * Recursively load DTLs and initialize all labels.
1661 if ((error = vdev_dtl_load(vd)) != 0 ||
1662 (error = vdev_label_init(vd, txg, isreplacing ?
1663 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) {
1672 vdev_metaslab_set_size(vdev_t *vd)
1675 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev.
1677 vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev);
1678 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT);
1682 vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg)
1684 ASSERT(vd == vd->vdev_top);
1685 ASSERT(!vd->vdev_ishole);
1686 ASSERT(ISP2(flags));
1687 ASSERT(spa_writeable(vd->vdev_spa));
1689 if (flags & VDD_METASLAB)
1690 (void) txg_list_add(&vd->vdev_ms_list, arg, txg);
1692 if (flags & VDD_DTL)
1693 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg);
1695 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg);
1699 vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg)
1703 for (c = 0; c < vd->vdev_children; c++)
1704 vdev_dirty_leaves(vd->vdev_child[c], flags, txg);
1706 if (vd->vdev_ops->vdev_op_leaf)
1707 vdev_dirty(vd->vdev_top, flags, vd, txg);
1713 * A vdev's DTL (dirty time log) is the set of transaction groups for which
1714 * the vdev has less than perfect replication. There are four kinds of DTL:
1716 * DTL_MISSING: txgs for which the vdev has no valid copies of the data
1718 * DTL_PARTIAL: txgs for which data is available, but not fully replicated
1720 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
1721 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
1722 * txgs that was scrubbed.
1724 * DTL_OUTAGE: txgs which cannot currently be read, whether due to
1725 * persistent errors or just some device being offline.
1726 * Unlike the other three, the DTL_OUTAGE map is not generally
1727 * maintained; it's only computed when needed, typically to
1728 * determine whether a device can be detached.
1730 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
1731 * either has the data or it doesn't.
1733 * For interior vdevs such as mirror and RAID-Z the picture is more complex.
1734 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
1735 * if any child is less than fully replicated, then so is its parent.
1736 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
1737 * comprising only those txgs which appear in 'maxfaults' or more children;
1738 * those are the txgs we don't have enough replication to read. For example,
1739 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
1740 * thus, its DTL_MISSING consists of the set of txgs that appear in more than
1741 * two child DTL_MISSING maps.
1743 * It should be clear from the above that to compute the DTLs and outage maps
1744 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
1745 * Therefore, that is all we keep on disk. When loading the pool, or after
1746 * a configuration change, we generate all other DTLs from first principles.
1749 vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size)
1751 range_tree_t *rt = vd->vdev_dtl[t];
1753 ASSERT(t < DTL_TYPES);
1754 ASSERT(vd != vd->vdev_spa->spa_root_vdev);
1755 ASSERT(spa_writeable(vd->vdev_spa));
1757 mutex_enter(rt->rt_lock);
1758 if (!range_tree_contains(rt, txg, size))
1759 range_tree_add(rt, txg, size);
1760 mutex_exit(rt->rt_lock);
1764 vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size)
1766 range_tree_t *rt = vd->vdev_dtl[t];
1767 boolean_t dirty = B_FALSE;
1769 ASSERT(t < DTL_TYPES);
1770 ASSERT(vd != vd->vdev_spa->spa_root_vdev);
1772 mutex_enter(rt->rt_lock);
1773 if (range_tree_space(rt) != 0)
1774 dirty = range_tree_contains(rt, txg, size);
1775 mutex_exit(rt->rt_lock);
1781 vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t)
1783 range_tree_t *rt = vd->vdev_dtl[t];
1786 mutex_enter(rt->rt_lock);
1787 empty = (range_tree_space(rt) == 0);
1788 mutex_exit(rt->rt_lock);
1794 * Returns the lowest txg in the DTL range.
1797 vdev_dtl_min(vdev_t *vd)
1801 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock));
1802 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0);
1803 ASSERT0(vd->vdev_children);
1805 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root);
1806 return (rs->rs_start - 1);
1810 * Returns the highest txg in the DTL.
1813 vdev_dtl_max(vdev_t *vd)
1817 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock));
1818 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0);
1819 ASSERT0(vd->vdev_children);
1821 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root);
1822 return (rs->rs_end);
1826 * Determine if a resilvering vdev should remove any DTL entries from
1827 * its range. If the vdev was resilvering for the entire duration of the
1828 * scan then it should excise that range from its DTLs. Otherwise, this
1829 * vdev is considered partially resilvered and should leave its DTL
1830 * entries intact. The comment in vdev_dtl_reassess() describes how we
1834 vdev_dtl_should_excise(vdev_t *vd)
1836 spa_t *spa = vd->vdev_spa;
1837 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
1839 ASSERT0(scn->scn_phys.scn_errors);
1840 ASSERT0(vd->vdev_children);
1842 if (vd->vdev_resilver_txg == 0 ||
1843 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0)
1847 * When a resilver is initiated the scan will assign the scn_max_txg
1848 * value to the highest txg value that exists in all DTLs. If this
1849 * device's max DTL is not part of this scan (i.e. it is not in
1850 * the range (scn_min_txg, scn_max_txg] then it is not eligible
1853 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) {
1854 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd));
1855 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg);
1856 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg);
1863 * Reassess DTLs after a config change or scrub completion.
1866 vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done)
1868 spa_t *spa = vd->vdev_spa;
1872 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
1874 for (c = 0; c < vd->vdev_children; c++)
1875 vdev_dtl_reassess(vd->vdev_child[c], txg,
1876 scrub_txg, scrub_done);
1878 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux)
1881 if (vd->vdev_ops->vdev_op_leaf) {
1882 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
1884 mutex_enter(&vd->vdev_dtl_lock);
1887 * If we've completed a scan cleanly then determine
1888 * if this vdev should remove any DTLs. We only want to
1889 * excise regions on vdevs that were available during
1890 * the entire duration of this scan.
1892 if (scrub_txg != 0 &&
1893 (spa->spa_scrub_started ||
1894 (scn != NULL && scn->scn_phys.scn_errors == 0)) &&
1895 vdev_dtl_should_excise(vd)) {
1897 * We completed a scrub up to scrub_txg. If we
1898 * did it without rebooting, then the scrub dtl
1899 * will be valid, so excise the old region and
1900 * fold in the scrub dtl. Otherwise, leave the
1901 * dtl as-is if there was an error.
1903 * There's little trick here: to excise the beginning
1904 * of the DTL_MISSING map, we put it into a reference
1905 * tree and then add a segment with refcnt -1 that
1906 * covers the range [0, scrub_txg). This means
1907 * that each txg in that range has refcnt -1 or 0.
1908 * We then add DTL_SCRUB with a refcnt of 2, so that
1909 * entries in the range [0, scrub_txg) will have a
1910 * positive refcnt -- either 1 or 2. We then convert
1911 * the reference tree into the new DTL_MISSING map.
1913 space_reftree_create(&reftree);
1914 space_reftree_add_map(&reftree,
1915 vd->vdev_dtl[DTL_MISSING], 1);
1916 space_reftree_add_seg(&reftree, 0, scrub_txg, -1);
1917 space_reftree_add_map(&reftree,
1918 vd->vdev_dtl[DTL_SCRUB], 2);
1919 space_reftree_generate_map(&reftree,
1920 vd->vdev_dtl[DTL_MISSING], 1);
1921 space_reftree_destroy(&reftree);
1923 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL);
1924 range_tree_walk(vd->vdev_dtl[DTL_MISSING],
1925 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]);
1927 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL);
1928 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL);
1929 if (!vdev_readable(vd))
1930 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL);
1932 range_tree_walk(vd->vdev_dtl[DTL_MISSING],
1933 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]);
1936 * If the vdev was resilvering and no longer has any
1937 * DTLs then reset its resilvering flag and dirty
1938 * the top level so that we persist the change.
1940 if (vd->vdev_resilver_txg != 0 &&
1941 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0 &&
1942 range_tree_space(vd->vdev_dtl[DTL_OUTAGE]) == 0) {
1943 vd->vdev_resilver_txg = 0;
1944 vdev_config_dirty(vd->vdev_top);
1947 mutex_exit(&vd->vdev_dtl_lock);
1950 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg);
1954 mutex_enter(&vd->vdev_dtl_lock);
1955 for (t = 0; t < DTL_TYPES; t++) {
1958 /* account for child's outage in parent's missing map */
1959 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t;
1961 continue; /* leaf vdevs only */
1962 if (t == DTL_PARTIAL)
1963 minref = 1; /* i.e. non-zero */
1964 else if (vd->vdev_nparity != 0)
1965 minref = vd->vdev_nparity + 1; /* RAID-Z */
1967 minref = vd->vdev_children; /* any kind of mirror */
1968 space_reftree_create(&reftree);
1969 for (c = 0; c < vd->vdev_children; c++) {
1970 vdev_t *cvd = vd->vdev_child[c];
1971 mutex_enter(&cvd->vdev_dtl_lock);
1972 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1);
1973 mutex_exit(&cvd->vdev_dtl_lock);
1975 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref);
1976 space_reftree_destroy(&reftree);
1978 mutex_exit(&vd->vdev_dtl_lock);
1982 vdev_dtl_load(vdev_t *vd)
1984 spa_t *spa = vd->vdev_spa;
1985 objset_t *mos = spa->spa_meta_objset;
1989 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) {
1990 ASSERT(!vd->vdev_ishole);
1992 error = space_map_open(&vd->vdev_dtl_sm, mos,
1993 vd->vdev_dtl_object, 0, -1ULL, 0, &vd->vdev_dtl_lock);
1996 ASSERT(vd->vdev_dtl_sm != NULL);
1998 mutex_enter(&vd->vdev_dtl_lock);
2001 * Now that we've opened the space_map we need to update
2004 space_map_update(vd->vdev_dtl_sm);
2006 error = space_map_load(vd->vdev_dtl_sm,
2007 vd->vdev_dtl[DTL_MISSING], SM_ALLOC);
2008 mutex_exit(&vd->vdev_dtl_lock);
2013 for (c = 0; c < vd->vdev_children; c++) {
2014 error = vdev_dtl_load(vd->vdev_child[c]);
2023 vdev_destroy_unlink_zap(vdev_t *vd, uint64_t zapobj, dmu_tx_t *tx)
2025 spa_t *spa = vd->vdev_spa;
2027 VERIFY0(zap_destroy(spa->spa_meta_objset, zapobj, tx));
2028 VERIFY0(zap_remove_int(spa->spa_meta_objset, spa->spa_all_vdev_zaps,
2033 vdev_create_link_zap(vdev_t *vd, dmu_tx_t *tx)
2035 spa_t *spa = vd->vdev_spa;
2036 uint64_t zap = zap_create(spa->spa_meta_objset, DMU_OTN_ZAP_METADATA,
2037 DMU_OT_NONE, 0, tx);
2040 VERIFY0(zap_add_int(spa->spa_meta_objset, spa->spa_all_vdev_zaps,
2047 vdev_construct_zaps(vdev_t *vd, dmu_tx_t *tx)
2051 if (vd->vdev_ops != &vdev_hole_ops &&
2052 vd->vdev_ops != &vdev_missing_ops &&
2053 vd->vdev_ops != &vdev_root_ops &&
2054 !vd->vdev_top->vdev_removing) {
2055 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_leaf_zap == 0) {
2056 vd->vdev_leaf_zap = vdev_create_link_zap(vd, tx);
2058 if (vd == vd->vdev_top && vd->vdev_top_zap == 0) {
2059 vd->vdev_top_zap = vdev_create_link_zap(vd, tx);
2062 for (i = 0; i < vd->vdev_children; i++) {
2063 vdev_construct_zaps(vd->vdev_child[i], tx);
2068 vdev_dtl_sync(vdev_t *vd, uint64_t txg)
2070 spa_t *spa = vd->vdev_spa;
2071 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING];
2072 objset_t *mos = spa->spa_meta_objset;
2073 range_tree_t *rtsync;
2076 uint64_t object = space_map_object(vd->vdev_dtl_sm);
2078 ASSERT(!vd->vdev_ishole);
2079 ASSERT(vd->vdev_ops->vdev_op_leaf);
2081 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
2083 if (vd->vdev_detached || vd->vdev_top->vdev_removing) {
2084 mutex_enter(&vd->vdev_dtl_lock);
2085 space_map_free(vd->vdev_dtl_sm, tx);
2086 space_map_close(vd->vdev_dtl_sm);
2087 vd->vdev_dtl_sm = NULL;
2088 mutex_exit(&vd->vdev_dtl_lock);
2091 * We only destroy the leaf ZAP for detached leaves or for
2092 * removed log devices. Removed data devices handle leaf ZAP
2093 * cleanup later, once cancellation is no longer possible.
2095 if (vd->vdev_leaf_zap != 0 && (vd->vdev_detached ||
2096 vd->vdev_top->vdev_islog)) {
2097 vdev_destroy_unlink_zap(vd, vd->vdev_leaf_zap, tx);
2098 vd->vdev_leaf_zap = 0;
2105 if (vd->vdev_dtl_sm == NULL) {
2106 uint64_t new_object;
2108 new_object = space_map_alloc(mos, tx);
2109 VERIFY3U(new_object, !=, 0);
2111 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object,
2112 0, -1ULL, 0, &vd->vdev_dtl_lock));
2113 ASSERT(vd->vdev_dtl_sm != NULL);
2116 mutex_init(&rtlock, NULL, MUTEX_DEFAULT, NULL);
2118 rtsync = range_tree_create(NULL, NULL, &rtlock);
2120 mutex_enter(&rtlock);
2122 mutex_enter(&vd->vdev_dtl_lock);
2123 range_tree_walk(rt, range_tree_add, rtsync);
2124 mutex_exit(&vd->vdev_dtl_lock);
2126 space_map_truncate(vd->vdev_dtl_sm, tx);
2127 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, tx);
2128 range_tree_vacate(rtsync, NULL, NULL);
2130 range_tree_destroy(rtsync);
2132 mutex_exit(&rtlock);
2133 mutex_destroy(&rtlock);
2136 * If the object for the space map has changed then dirty
2137 * the top level so that we update the config.
2139 if (object != space_map_object(vd->vdev_dtl_sm)) {
2140 zfs_dbgmsg("txg %llu, spa %s, DTL old object %llu, "
2141 "new object %llu", txg, spa_name(spa), object,
2142 space_map_object(vd->vdev_dtl_sm));
2143 vdev_config_dirty(vd->vdev_top);
2148 mutex_enter(&vd->vdev_dtl_lock);
2149 space_map_update(vd->vdev_dtl_sm);
2150 mutex_exit(&vd->vdev_dtl_lock);
2154 * Determine whether the specified vdev can be offlined/detached/removed
2155 * without losing data.
2158 vdev_dtl_required(vdev_t *vd)
2160 spa_t *spa = vd->vdev_spa;
2161 vdev_t *tvd = vd->vdev_top;
2162 uint8_t cant_read = vd->vdev_cant_read;
2165 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
2167 if (vd == spa->spa_root_vdev || vd == tvd)
2171 * Temporarily mark the device as unreadable, and then determine
2172 * whether this results in any DTL outages in the top-level vdev.
2173 * If not, we can safely offline/detach/remove the device.
2175 vd->vdev_cant_read = B_TRUE;
2176 vdev_dtl_reassess(tvd, 0, 0, B_FALSE);
2177 required = !vdev_dtl_empty(tvd, DTL_OUTAGE);
2178 vd->vdev_cant_read = cant_read;
2179 vdev_dtl_reassess(tvd, 0, 0, B_FALSE);
2181 if (!required && zio_injection_enabled)
2182 required = !!zio_handle_device_injection(vd, NULL, ECHILD);
2188 * Determine if resilver is needed, and if so the txg range.
2191 vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp)
2193 boolean_t needed = B_FALSE;
2194 uint64_t thismin = UINT64_MAX;
2195 uint64_t thismax = 0;
2198 if (vd->vdev_children == 0) {
2199 mutex_enter(&vd->vdev_dtl_lock);
2200 if (range_tree_space(vd->vdev_dtl[DTL_MISSING]) != 0 &&
2201 vdev_writeable(vd)) {
2203 thismin = vdev_dtl_min(vd);
2204 thismax = vdev_dtl_max(vd);
2207 mutex_exit(&vd->vdev_dtl_lock);
2209 for (c = 0; c < vd->vdev_children; c++) {
2210 vdev_t *cvd = vd->vdev_child[c];
2211 uint64_t cmin, cmax;
2213 if (vdev_resilver_needed(cvd, &cmin, &cmax)) {
2214 thismin = MIN(thismin, cmin);
2215 thismax = MAX(thismax, cmax);
2221 if (needed && minp) {
2229 vdev_load(vdev_t *vd)
2234 * Recursively load all children.
2236 for (c = 0; c < vd->vdev_children; c++)
2237 vdev_load(vd->vdev_child[c]);
2240 * If this is a top-level vdev, initialize its metaslabs.
2242 if (vd == vd->vdev_top && !vd->vdev_ishole &&
2243 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 ||
2244 vdev_metaslab_init(vd, 0) != 0))
2245 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
2246 VDEV_AUX_CORRUPT_DATA);
2248 * If this is a leaf vdev, load its DTL.
2250 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0)
2251 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
2252 VDEV_AUX_CORRUPT_DATA);
2256 * The special vdev case is used for hot spares and l2cache devices. Its
2257 * sole purpose it to set the vdev state for the associated vdev. To do this,
2258 * we make sure that we can open the underlying device, then try to read the
2259 * label, and make sure that the label is sane and that it hasn't been
2260 * repurposed to another pool.
2263 vdev_validate_aux(vdev_t *vd)
2266 uint64_t guid, version;
2269 if (!vdev_readable(vd))
2272 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) {
2273 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
2274 VDEV_AUX_CORRUPT_DATA);
2278 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 ||
2279 !SPA_VERSION_IS_SUPPORTED(version) ||
2280 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 ||
2281 guid != vd->vdev_guid ||
2282 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) {
2283 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
2284 VDEV_AUX_CORRUPT_DATA);
2290 * We don't actually check the pool state here. If it's in fact in
2291 * use by another pool, we update this fact on the fly when requested.
2298 vdev_remove(vdev_t *vd, uint64_t txg)
2300 spa_t *spa = vd->vdev_spa;
2301 objset_t *mos = spa->spa_meta_objset;
2305 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg);
2306 ASSERT(vd == vd->vdev_top);
2307 ASSERT3U(txg, ==, spa_syncing_txg(spa));
2309 if (vd->vdev_ms != NULL) {
2310 metaslab_group_t *mg = vd->vdev_mg;
2312 metaslab_group_histogram_verify(mg);
2313 metaslab_class_histogram_verify(mg->mg_class);
2315 for (m = 0; m < vd->vdev_ms_count; m++) {
2316 metaslab_t *msp = vd->vdev_ms[m];
2318 if (msp == NULL || msp->ms_sm == NULL)
2321 mutex_enter(&msp->ms_lock);
2323 * If the metaslab was not loaded when the vdev
2324 * was removed then the histogram accounting may
2325 * not be accurate. Update the histogram information
2326 * here so that we ensure that the metaslab group
2327 * and metaslab class are up-to-date.
2329 metaslab_group_histogram_remove(mg, msp);
2331 VERIFY0(space_map_allocated(msp->ms_sm));
2332 space_map_free(msp->ms_sm, tx);
2333 space_map_close(msp->ms_sm);
2335 mutex_exit(&msp->ms_lock);
2338 metaslab_group_histogram_verify(mg);
2339 metaslab_class_histogram_verify(mg->mg_class);
2340 for (i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++)
2341 ASSERT0(mg->mg_histogram[i]);
2345 if (vd->vdev_ms_array) {
2346 (void) dmu_object_free(mos, vd->vdev_ms_array, tx);
2347 vd->vdev_ms_array = 0;
2350 if (vd->vdev_islog && vd->vdev_top_zap != 0) {
2351 vdev_destroy_unlink_zap(vd, vd->vdev_top_zap, tx);
2352 vd->vdev_top_zap = 0;
2358 vdev_sync_done(vdev_t *vd, uint64_t txg)
2361 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg));
2363 ASSERT(!vd->vdev_ishole);
2365 while ((msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))))
2366 metaslab_sync_done(msp, txg);
2369 metaslab_sync_reassess(vd->vdev_mg);
2373 vdev_sync(vdev_t *vd, uint64_t txg)
2375 spa_t *spa = vd->vdev_spa;
2380 ASSERT(!vd->vdev_ishole);
2382 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) {
2383 ASSERT(vd == vd->vdev_top);
2384 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
2385 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset,
2386 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx);
2387 ASSERT(vd->vdev_ms_array != 0);
2388 vdev_config_dirty(vd);
2393 * Remove the metadata associated with this vdev once it's empty.
2395 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing)
2396 vdev_remove(vd, txg);
2398 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) {
2399 metaslab_sync(msp, txg);
2400 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg));
2403 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL)
2404 vdev_dtl_sync(lvd, txg);
2406 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg));
2410 vdev_psize_to_asize(vdev_t *vd, uint64_t psize)
2412 return (vd->vdev_ops->vdev_op_asize(vd, psize));
2416 * Mark the given vdev faulted. A faulted vdev behaves as if the device could
2417 * not be opened, and no I/O is attempted.
2420 vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux)
2424 spa_vdev_state_enter(spa, SCL_NONE);
2426 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2427 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2429 if (!vd->vdev_ops->vdev_op_leaf)
2430 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2435 * We don't directly use the aux state here, but if we do a
2436 * vdev_reopen(), we need this value to be present to remember why we
2439 vd->vdev_label_aux = aux;
2442 * Faulted state takes precedence over degraded.
2444 vd->vdev_delayed_close = B_FALSE;
2445 vd->vdev_faulted = 1ULL;
2446 vd->vdev_degraded = 0ULL;
2447 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux);
2450 * If this device has the only valid copy of the data, then
2451 * back off and simply mark the vdev as degraded instead.
2453 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) {
2454 vd->vdev_degraded = 1ULL;
2455 vd->vdev_faulted = 0ULL;
2458 * If we reopen the device and it's not dead, only then do we
2463 if (vdev_readable(vd))
2464 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux);
2467 return (spa_vdev_state_exit(spa, vd, 0));
2471 * Mark the given vdev degraded. A degraded vdev is purely an indication to the
2472 * user that something is wrong. The vdev continues to operate as normal as far
2473 * as I/O is concerned.
2476 vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux)
2480 spa_vdev_state_enter(spa, SCL_NONE);
2482 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2483 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2485 if (!vd->vdev_ops->vdev_op_leaf)
2486 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2489 * If the vdev is already faulted, then don't do anything.
2491 if (vd->vdev_faulted || vd->vdev_degraded)
2492 return (spa_vdev_state_exit(spa, NULL, 0));
2494 vd->vdev_degraded = 1ULL;
2495 if (!vdev_is_dead(vd))
2496 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED,
2499 return (spa_vdev_state_exit(spa, vd, 0));
2503 * Online the given vdev.
2505 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached
2506 * spare device should be detached when the device finishes resilvering.
2507 * Second, the online should be treated like a 'test' online case, so no FMA
2508 * events are generated if the device fails to open.
2511 vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate)
2513 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev;
2514 boolean_t postevent = B_FALSE;
2516 spa_vdev_state_enter(spa, SCL_NONE);
2518 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2519 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2521 if (!vd->vdev_ops->vdev_op_leaf)
2522 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2525 (vd->vdev_offline == B_TRUE || vd->vdev_tmpoffline == B_TRUE) ?
2529 vd->vdev_offline = B_FALSE;
2530 vd->vdev_tmpoffline = B_FALSE;
2531 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE);
2532 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT);
2534 /* XXX - L2ARC 1.0 does not support expansion */
2535 if (!vd->vdev_aux) {
2536 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
2537 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND);
2541 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE;
2543 if (!vd->vdev_aux) {
2544 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
2545 pvd->vdev_expanding = B_FALSE;
2549 *newstate = vd->vdev_state;
2550 if ((flags & ZFS_ONLINE_UNSPARE) &&
2551 !vdev_is_dead(vd) && vd->vdev_parent &&
2552 vd->vdev_parent->vdev_ops == &vdev_spare_ops &&
2553 vd->vdev_parent->vdev_child[0] == vd)
2554 vd->vdev_unspare = B_TRUE;
2556 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) {
2558 /* XXX - L2ARC 1.0 does not support expansion */
2560 return (spa_vdev_state_exit(spa, vd, ENOTSUP));
2561 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
2565 spa_event_notify(spa, vd, ESC_ZFS_VDEV_ONLINE);
2567 return (spa_vdev_state_exit(spa, vd, 0));
2571 vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags)
2575 uint64_t generation;
2576 metaslab_group_t *mg;
2579 spa_vdev_state_enter(spa, SCL_ALLOC);
2581 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2582 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2584 if (!vd->vdev_ops->vdev_op_leaf)
2585 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2589 generation = spa->spa_config_generation + 1;
2592 * If the device isn't already offline, try to offline it.
2594 if (!vd->vdev_offline) {
2596 * If this device has the only valid copy of some data,
2597 * don't allow it to be offlined. Log devices are always
2600 if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
2601 vdev_dtl_required(vd))
2602 return (spa_vdev_state_exit(spa, NULL, EBUSY));
2605 * If the top-level is a slog and it has had allocations
2606 * then proceed. We check that the vdev's metaslab group
2607 * is not NULL since it's possible that we may have just
2608 * added this vdev but not yet initialized its metaslabs.
2610 if (tvd->vdev_islog && mg != NULL) {
2612 * Prevent any future allocations.
2614 metaslab_group_passivate(mg);
2615 (void) spa_vdev_state_exit(spa, vd, 0);
2617 error = spa_offline_log(spa);
2619 spa_vdev_state_enter(spa, SCL_ALLOC);
2622 * Check to see if the config has changed.
2624 if (error || generation != spa->spa_config_generation) {
2625 metaslab_group_activate(mg);
2627 return (spa_vdev_state_exit(spa,
2629 (void) spa_vdev_state_exit(spa, vd, 0);
2632 ASSERT0(tvd->vdev_stat.vs_alloc);
2636 * Offline this device and reopen its top-level vdev.
2637 * If the top-level vdev is a log device then just offline
2638 * it. Otherwise, if this action results in the top-level
2639 * vdev becoming unusable, undo it and fail the request.
2641 vd->vdev_offline = B_TRUE;
2644 if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
2645 vdev_is_dead(tvd)) {
2646 vd->vdev_offline = B_FALSE;
2648 return (spa_vdev_state_exit(spa, NULL, EBUSY));
2652 * Add the device back into the metaslab rotor so that
2653 * once we online the device it's open for business.
2655 if (tvd->vdev_islog && mg != NULL)
2656 metaslab_group_activate(mg);
2659 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY);
2661 return (spa_vdev_state_exit(spa, vd, 0));
2665 vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags)
2669 mutex_enter(&spa->spa_vdev_top_lock);
2670 error = vdev_offline_locked(spa, guid, flags);
2671 mutex_exit(&spa->spa_vdev_top_lock);
2677 * Clear the error counts associated with this vdev. Unlike vdev_online() and
2678 * vdev_offline(), we assume the spa config is locked. We also clear all
2679 * children. If 'vd' is NULL, then the user wants to clear all vdevs.
2682 vdev_clear(spa_t *spa, vdev_t *vd)
2684 vdev_t *rvd = spa->spa_root_vdev;
2687 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
2692 vd->vdev_stat.vs_read_errors = 0;
2693 vd->vdev_stat.vs_write_errors = 0;
2694 vd->vdev_stat.vs_checksum_errors = 0;
2696 for (c = 0; c < vd->vdev_children; c++)
2697 vdev_clear(spa, vd->vdev_child[c]);
2700 * If we're in the FAULTED state or have experienced failed I/O, then
2701 * clear the persistent state and attempt to reopen the device. We
2702 * also mark the vdev config dirty, so that the new faulted state is
2703 * written out to disk.
2705 if (vd->vdev_faulted || vd->vdev_degraded ||
2706 !vdev_readable(vd) || !vdev_writeable(vd)) {
2709 * When reopening in reponse to a clear event, it may be due to
2710 * a fmadm repair request. In this case, if the device is
2711 * still broken, we want to still post the ereport again.
2713 vd->vdev_forcefault = B_TRUE;
2715 vd->vdev_faulted = vd->vdev_degraded = 0ULL;
2716 vd->vdev_cant_read = B_FALSE;
2717 vd->vdev_cant_write = B_FALSE;
2719 vdev_reopen(vd == rvd ? rvd : vd->vdev_top);
2721 vd->vdev_forcefault = B_FALSE;
2723 if (vd != rvd && vdev_writeable(vd->vdev_top))
2724 vdev_state_dirty(vd->vdev_top);
2726 if (vd->vdev_aux == NULL && !vdev_is_dead(vd))
2727 spa_async_request(spa, SPA_ASYNC_RESILVER);
2729 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR);
2733 * When clearing a FMA-diagnosed fault, we always want to
2734 * unspare the device, as we assume that the original spare was
2735 * done in response to the FMA fault.
2737 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL &&
2738 vd->vdev_parent->vdev_ops == &vdev_spare_ops &&
2739 vd->vdev_parent->vdev_child[0] == vd)
2740 vd->vdev_unspare = B_TRUE;
2744 vdev_is_dead(vdev_t *vd)
2747 * Holes and missing devices are always considered "dead".
2748 * This simplifies the code since we don't have to check for
2749 * these types of devices in the various code paths.
2750 * Instead we rely on the fact that we skip over dead devices
2751 * before issuing I/O to them.
2753 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole ||
2754 vd->vdev_ops == &vdev_missing_ops);
2758 vdev_readable(vdev_t *vd)
2760 return (!vdev_is_dead(vd) && !vd->vdev_cant_read);
2764 vdev_writeable(vdev_t *vd)
2766 return (!vdev_is_dead(vd) && !vd->vdev_cant_write);
2770 vdev_allocatable(vdev_t *vd)
2772 uint64_t state = vd->vdev_state;
2775 * We currently allow allocations from vdevs which may be in the
2776 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
2777 * fails to reopen then we'll catch it later when we're holding
2778 * the proper locks. Note that we have to get the vdev state
2779 * in a local variable because although it changes atomically,
2780 * we're asking two separate questions about it.
2782 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) &&
2783 !vd->vdev_cant_write && !vd->vdev_ishole &&
2784 vd->vdev_mg->mg_initialized);
2788 vdev_accessible(vdev_t *vd, zio_t *zio)
2790 ASSERT(zio->io_vd == vd);
2792 if (vdev_is_dead(vd) || vd->vdev_remove_wanted)
2795 if (zio->io_type == ZIO_TYPE_READ)
2796 return (!vd->vdev_cant_read);
2798 if (zio->io_type == ZIO_TYPE_WRITE)
2799 return (!vd->vdev_cant_write);
2805 vdev_get_child_stat(vdev_t *cvd, vdev_stat_t *vs, vdev_stat_t *cvs)
2808 for (t = 0; t < ZIO_TYPES; t++) {
2809 vs->vs_ops[t] += cvs->vs_ops[t];
2810 vs->vs_bytes[t] += cvs->vs_bytes[t];
2813 cvs->vs_scan_removing = cvd->vdev_removing;
2817 * Get extended stats
2820 vdev_get_child_stat_ex(vdev_t *cvd, vdev_stat_ex_t *vsx, vdev_stat_ex_t *cvsx)
2823 for (t = 0; t < ZIO_TYPES; t++) {
2824 for (b = 0; b < ARRAY_SIZE(vsx->vsx_disk_histo[0]); b++)
2825 vsx->vsx_disk_histo[t][b] += cvsx->vsx_disk_histo[t][b];
2827 for (b = 0; b < ARRAY_SIZE(vsx->vsx_total_histo[0]); b++) {
2828 vsx->vsx_total_histo[t][b] +=
2829 cvsx->vsx_total_histo[t][b];
2833 for (t = 0; t < ZIO_PRIORITY_NUM_QUEUEABLE; t++) {
2834 for (b = 0; b < ARRAY_SIZE(vsx->vsx_queue_histo[0]); b++) {
2835 vsx->vsx_queue_histo[t][b] +=
2836 cvsx->vsx_queue_histo[t][b];
2838 vsx->vsx_active_queue[t] += cvsx->vsx_active_queue[t];
2839 vsx->vsx_pend_queue[t] += cvsx->vsx_pend_queue[t];
2841 for (b = 0; b < ARRAY_SIZE(vsx->vsx_ind_histo[0]); b++)
2842 vsx->vsx_ind_histo[t][b] += cvsx->vsx_ind_histo[t][b];
2844 for (b = 0; b < ARRAY_SIZE(vsx->vsx_agg_histo[0]); b++)
2845 vsx->vsx_agg_histo[t][b] += cvsx->vsx_agg_histo[t][b];
2851 * Get statistics for the given vdev.
2854 vdev_get_stats_ex_impl(vdev_t *vd, vdev_stat_t *vs, vdev_stat_ex_t *vsx)
2858 * If we're getting stats on the root vdev, aggregate the I/O counts
2859 * over all top-level vdevs (i.e. the direct children of the root).
2861 if (!vd->vdev_ops->vdev_op_leaf) {
2863 memset(vs->vs_ops, 0, sizeof (vs->vs_ops));
2864 memset(vs->vs_bytes, 0, sizeof (vs->vs_bytes));
2867 memset(vsx, 0, sizeof (*vsx));
2869 for (c = 0; c < vd->vdev_children; c++) {
2870 vdev_t *cvd = vd->vdev_child[c];
2871 vdev_stat_t *cvs = &cvd->vdev_stat;
2872 vdev_stat_ex_t *cvsx = &cvd->vdev_stat_ex;
2874 vdev_get_stats_ex_impl(cvd, cvs, cvsx);
2876 vdev_get_child_stat(cvd, vs, cvs);
2878 vdev_get_child_stat_ex(cvd, vsx, cvsx);
2883 * We're a leaf. Just copy our ZIO active queue stats in. The
2884 * other leaf stats are updated in vdev_stat_update().
2889 memcpy(vsx, &vd->vdev_stat_ex, sizeof (vd->vdev_stat_ex));
2891 for (t = 0; t < ARRAY_SIZE(vd->vdev_queue.vq_class); t++) {
2892 vsx->vsx_active_queue[t] =
2893 vd->vdev_queue.vq_class[t].vqc_active;
2894 vsx->vsx_pend_queue[t] = avl_numnodes(
2895 &vd->vdev_queue.vq_class[t].vqc_queued_tree);
2901 vdev_get_stats_ex(vdev_t *vd, vdev_stat_t *vs, vdev_stat_ex_t *vsx)
2903 mutex_enter(&vd->vdev_stat_lock);
2905 bcopy(&vd->vdev_stat, vs, sizeof (*vs));
2906 vs->vs_timestamp = gethrtime() - vs->vs_timestamp;
2907 vs->vs_state = vd->vdev_state;
2908 vs->vs_rsize = vdev_get_min_asize(vd);
2909 if (vd->vdev_ops->vdev_op_leaf)
2910 vs->vs_rsize += VDEV_LABEL_START_SIZE +
2911 VDEV_LABEL_END_SIZE;
2912 vs->vs_esize = vd->vdev_max_asize - vd->vdev_asize;
2913 if (vd->vdev_aux == NULL && vd == vd->vdev_top &&
2915 vs->vs_fragmentation = vd->vdev_mg->mg_fragmentation;
2919 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_READER) != 0);
2920 vdev_get_stats_ex_impl(vd, vs, vsx);
2921 mutex_exit(&vd->vdev_stat_lock);
2925 vdev_get_stats(vdev_t *vd, vdev_stat_t *vs)
2927 return (vdev_get_stats_ex(vd, vs, NULL));
2931 vdev_clear_stats(vdev_t *vd)
2933 mutex_enter(&vd->vdev_stat_lock);
2934 vd->vdev_stat.vs_space = 0;
2935 vd->vdev_stat.vs_dspace = 0;
2936 vd->vdev_stat.vs_alloc = 0;
2937 mutex_exit(&vd->vdev_stat_lock);
2941 vdev_scan_stat_init(vdev_t *vd)
2943 vdev_stat_t *vs = &vd->vdev_stat;
2946 for (c = 0; c < vd->vdev_children; c++)
2947 vdev_scan_stat_init(vd->vdev_child[c]);
2949 mutex_enter(&vd->vdev_stat_lock);
2950 vs->vs_scan_processed = 0;
2951 mutex_exit(&vd->vdev_stat_lock);
2955 vdev_stat_update(zio_t *zio, uint64_t psize)
2957 spa_t *spa = zio->io_spa;
2958 vdev_t *rvd = spa->spa_root_vdev;
2959 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd;
2961 uint64_t txg = zio->io_txg;
2962 vdev_stat_t *vs = &vd->vdev_stat;
2963 vdev_stat_ex_t *vsx = &vd->vdev_stat_ex;
2964 zio_type_t type = zio->io_type;
2965 int flags = zio->io_flags;
2968 * If this i/o is a gang leader, it didn't do any actual work.
2970 if (zio->io_gang_tree)
2973 if (zio->io_error == 0) {
2975 * If this is a root i/o, don't count it -- we've already
2976 * counted the top-level vdevs, and vdev_get_stats() will
2977 * aggregate them when asked. This reduces contention on
2978 * the root vdev_stat_lock and implicitly handles blocks
2979 * that compress away to holes, for which there is no i/o.
2980 * (Holes never create vdev children, so all the counters
2981 * remain zero, which is what we want.)
2983 * Note: this only applies to successful i/o (io_error == 0)
2984 * because unlike i/o counts, errors are not additive.
2985 * When reading a ditto block, for example, failure of
2986 * one top-level vdev does not imply a root-level error.
2991 ASSERT(vd == zio->io_vd);
2993 if (flags & ZIO_FLAG_IO_BYPASS)
2996 mutex_enter(&vd->vdev_stat_lock);
2998 if (flags & ZIO_FLAG_IO_REPAIR) {
2999 if (flags & ZIO_FLAG_SCAN_THREAD) {
3000 dsl_scan_phys_t *scn_phys =
3001 &spa->spa_dsl_pool->dp_scan->scn_phys;
3002 uint64_t *processed = &scn_phys->scn_processed;
3005 if (vd->vdev_ops->vdev_op_leaf)
3006 atomic_add_64(processed, psize);
3007 vs->vs_scan_processed += psize;
3010 if (flags & ZIO_FLAG_SELF_HEAL)
3011 vs->vs_self_healed += psize;
3015 * The bytes/ops/histograms are recorded at the leaf level and
3016 * aggregated into the higher level vdevs in vdev_get_stats().
3018 if (vd->vdev_ops->vdev_op_leaf &&
3019 (zio->io_priority < ZIO_PRIORITY_NUM_QUEUEABLE)) {
3022 vs->vs_bytes[type] += psize;
3024 if (flags & ZIO_FLAG_DELEGATED) {
3025 vsx->vsx_agg_histo[zio->io_priority]
3026 [RQ_HISTO(zio->io_size)]++;
3028 vsx->vsx_ind_histo[zio->io_priority]
3029 [RQ_HISTO(zio->io_size)]++;
3032 if (zio->io_delta && zio->io_delay) {
3033 vsx->vsx_queue_histo[zio->io_priority]
3034 [L_HISTO(zio->io_delta - zio->io_delay)]++;
3035 vsx->vsx_disk_histo[type]
3036 [L_HISTO(zio->io_delay)]++;
3037 vsx->vsx_total_histo[type]
3038 [L_HISTO(zio->io_delta)]++;
3042 mutex_exit(&vd->vdev_stat_lock);
3046 if (flags & ZIO_FLAG_SPECULATIVE)
3050 * If this is an I/O error that is going to be retried, then ignore the
3051 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as
3052 * hard errors, when in reality they can happen for any number of
3053 * innocuous reasons (bus resets, MPxIO link failure, etc).
3055 if (zio->io_error == EIO &&
3056 !(zio->io_flags & ZIO_FLAG_IO_RETRY))
3060 * Intent logs writes won't propagate their error to the root
3061 * I/O so don't mark these types of failures as pool-level
3064 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE))
3067 mutex_enter(&vd->vdev_stat_lock);
3068 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) {
3069 if (zio->io_error == ECKSUM)
3070 vs->vs_checksum_errors++;
3072 vs->vs_read_errors++;
3074 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd))
3075 vs->vs_write_errors++;
3076 mutex_exit(&vd->vdev_stat_lock);
3078 if (type == ZIO_TYPE_WRITE && txg != 0 &&
3079 (!(flags & ZIO_FLAG_IO_REPAIR) ||
3080 (flags & ZIO_FLAG_SCAN_THREAD) ||
3081 spa->spa_claiming)) {
3083 * This is either a normal write (not a repair), or it's
3084 * a repair induced by the scrub thread, or it's a repair
3085 * made by zil_claim() during spa_load() in the first txg.
3086 * In the normal case, we commit the DTL change in the same
3087 * txg as the block was born. In the scrub-induced repair
3088 * case, we know that scrubs run in first-pass syncing context,
3089 * so we commit the DTL change in spa_syncing_txg(spa).
3090 * In the zil_claim() case, we commit in spa_first_txg(spa).
3092 * We currently do not make DTL entries for failed spontaneous
3093 * self-healing writes triggered by normal (non-scrubbing)
3094 * reads, because we have no transactional context in which to
3095 * do so -- and it's not clear that it'd be desirable anyway.
3097 if (vd->vdev_ops->vdev_op_leaf) {
3098 uint64_t commit_txg = txg;
3099 if (flags & ZIO_FLAG_SCAN_THREAD) {
3100 ASSERT(flags & ZIO_FLAG_IO_REPAIR);
3101 ASSERT(spa_sync_pass(spa) == 1);
3102 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1);
3103 commit_txg = spa_syncing_txg(spa);
3104 } else if (spa->spa_claiming) {
3105 ASSERT(flags & ZIO_FLAG_IO_REPAIR);
3106 commit_txg = spa_first_txg(spa);
3108 ASSERT(commit_txg >= spa_syncing_txg(spa));
3109 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1))
3111 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
3112 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1);
3113 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg);
3116 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1);
3121 * Update the in-core space usage stats for this vdev, its metaslab class,
3122 * and the root vdev.
3125 vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta,
3126 int64_t space_delta)
3128 int64_t dspace_delta = space_delta;
3129 spa_t *spa = vd->vdev_spa;
3130 vdev_t *rvd = spa->spa_root_vdev;
3131 metaslab_group_t *mg = vd->vdev_mg;
3132 metaslab_class_t *mc = mg ? mg->mg_class : NULL;
3134 ASSERT(vd == vd->vdev_top);
3137 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
3138 * factor. We must calculate this here and not at the root vdev
3139 * because the root vdev's psize-to-asize is simply the max of its
3140 * childrens', thus not accurate enough for us.
3142 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0);
3143 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache);
3144 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) *
3145 vd->vdev_deflate_ratio;
3147 mutex_enter(&vd->vdev_stat_lock);
3148 vd->vdev_stat.vs_alloc += alloc_delta;
3149 vd->vdev_stat.vs_space += space_delta;
3150 vd->vdev_stat.vs_dspace += dspace_delta;
3151 mutex_exit(&vd->vdev_stat_lock);
3153 if (mc == spa_normal_class(spa)) {
3154 mutex_enter(&rvd->vdev_stat_lock);
3155 rvd->vdev_stat.vs_alloc += alloc_delta;
3156 rvd->vdev_stat.vs_space += space_delta;
3157 rvd->vdev_stat.vs_dspace += dspace_delta;
3158 mutex_exit(&rvd->vdev_stat_lock);
3162 ASSERT(rvd == vd->vdev_parent);
3163 ASSERT(vd->vdev_ms_count != 0);
3165 metaslab_class_space_update(mc,
3166 alloc_delta, defer_delta, space_delta, dspace_delta);
3171 * Mark a top-level vdev's config as dirty, placing it on the dirty list
3172 * so that it will be written out next time the vdev configuration is synced.
3173 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
3176 vdev_config_dirty(vdev_t *vd)
3178 spa_t *spa = vd->vdev_spa;
3179 vdev_t *rvd = spa->spa_root_vdev;
3182 ASSERT(spa_writeable(spa));
3185 * If this is an aux vdev (as with l2cache and spare devices), then we
3186 * update the vdev config manually and set the sync flag.
3188 if (vd->vdev_aux != NULL) {
3189 spa_aux_vdev_t *sav = vd->vdev_aux;
3193 for (c = 0; c < sav->sav_count; c++) {
3194 if (sav->sav_vdevs[c] == vd)
3198 if (c == sav->sav_count) {
3200 * We're being removed. There's nothing more to do.
3202 ASSERT(sav->sav_sync == B_TRUE);
3206 sav->sav_sync = B_TRUE;
3208 if (nvlist_lookup_nvlist_array(sav->sav_config,
3209 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) {
3210 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
3211 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0);
3217 * Setting the nvlist in the middle if the array is a little
3218 * sketchy, but it will work.
3220 nvlist_free(aux[c]);
3221 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0);
3227 * The dirty list is protected by the SCL_CONFIG lock. The caller
3228 * must either hold SCL_CONFIG as writer, or must be the sync thread
3229 * (which holds SCL_CONFIG as reader). There's only one sync thread,
3230 * so this is sufficient to ensure mutual exclusion.
3232 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) ||
3233 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
3234 spa_config_held(spa, SCL_CONFIG, RW_READER)));
3237 for (c = 0; c < rvd->vdev_children; c++)
3238 vdev_config_dirty(rvd->vdev_child[c]);
3240 ASSERT(vd == vd->vdev_top);
3242 if (!list_link_active(&vd->vdev_config_dirty_node) &&
3244 list_insert_head(&spa->spa_config_dirty_list, vd);
3249 vdev_config_clean(vdev_t *vd)
3251 spa_t *spa = vd->vdev_spa;
3253 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) ||
3254 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
3255 spa_config_held(spa, SCL_CONFIG, RW_READER)));
3257 ASSERT(list_link_active(&vd->vdev_config_dirty_node));
3258 list_remove(&spa->spa_config_dirty_list, vd);
3262 * Mark a top-level vdev's state as dirty, so that the next pass of
3263 * spa_sync() can convert this into vdev_config_dirty(). We distinguish
3264 * the state changes from larger config changes because they require
3265 * much less locking, and are often needed for administrative actions.
3268 vdev_state_dirty(vdev_t *vd)
3270 spa_t *spa = vd->vdev_spa;
3272 ASSERT(spa_writeable(spa));
3273 ASSERT(vd == vd->vdev_top);
3276 * The state list is protected by the SCL_STATE lock. The caller
3277 * must either hold SCL_STATE as writer, or must be the sync thread
3278 * (which holds SCL_STATE as reader). There's only one sync thread,
3279 * so this is sufficient to ensure mutual exclusion.
3281 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) ||
3282 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
3283 spa_config_held(spa, SCL_STATE, RW_READER)));
3285 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole)
3286 list_insert_head(&spa->spa_state_dirty_list, vd);
3290 vdev_state_clean(vdev_t *vd)
3292 spa_t *spa = vd->vdev_spa;
3294 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) ||
3295 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
3296 spa_config_held(spa, SCL_STATE, RW_READER)));
3298 ASSERT(list_link_active(&vd->vdev_state_dirty_node));
3299 list_remove(&spa->spa_state_dirty_list, vd);
3303 * Propagate vdev state up from children to parent.
3306 vdev_propagate_state(vdev_t *vd)
3308 spa_t *spa = vd->vdev_spa;
3309 vdev_t *rvd = spa->spa_root_vdev;
3310 int degraded = 0, faulted = 0;
3315 if (vd->vdev_children > 0) {
3316 for (c = 0; c < vd->vdev_children; c++) {
3317 child = vd->vdev_child[c];
3320 * Don't factor holes into the decision.
3322 if (child->vdev_ishole)
3325 if (!vdev_readable(child) ||
3326 (!vdev_writeable(child) && spa_writeable(spa))) {
3328 * Root special: if there is a top-level log
3329 * device, treat the root vdev as if it were
3332 if (child->vdev_islog && vd == rvd)
3336 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) {
3340 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA)
3344 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded);
3347 * Root special: if there is a top-level vdev that cannot be
3348 * opened due to corrupted metadata, then propagate the root
3349 * vdev's aux state as 'corrupt' rather than 'insufficient
3352 if (corrupted && vd == rvd &&
3353 rvd->vdev_state == VDEV_STATE_CANT_OPEN)
3354 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN,
3355 VDEV_AUX_CORRUPT_DATA);
3358 if (vd->vdev_parent)
3359 vdev_propagate_state(vd->vdev_parent);
3363 * Set a vdev's state. If this is during an open, we don't update the parent
3364 * state, because we're in the process of opening children depth-first.
3365 * Otherwise, we propagate the change to the parent.
3367 * If this routine places a device in a faulted state, an appropriate ereport is
3371 vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux)
3373 uint64_t save_state;
3374 spa_t *spa = vd->vdev_spa;
3376 if (state == vd->vdev_state) {
3378 * Since vdev_offline() code path is already in an offline
3379 * state we can miss a statechange event to OFFLINE. Check
3380 * the previous state to catch this condition.
3382 if (vd->vdev_ops->vdev_op_leaf &&
3383 (state == VDEV_STATE_OFFLINE) &&
3384 (vd->vdev_prevstate >= VDEV_STATE_FAULTED)) {
3385 /* post an offline state change */
3386 zfs_post_state_change(spa, vd, vd->vdev_prevstate);
3388 vd->vdev_stat.vs_aux = aux;
3392 save_state = vd->vdev_state;
3394 vd->vdev_state = state;
3395 vd->vdev_stat.vs_aux = aux;
3398 * If we are setting the vdev state to anything but an open state, then
3399 * always close the underlying device unless the device has requested
3400 * a delayed close (i.e. we're about to remove or fault the device).
3401 * Otherwise, we keep accessible but invalid devices open forever.
3402 * We don't call vdev_close() itself, because that implies some extra
3403 * checks (offline, etc) that we don't want here. This is limited to
3404 * leaf devices, because otherwise closing the device will affect other
3407 if (!vd->vdev_delayed_close && vdev_is_dead(vd) &&
3408 vd->vdev_ops->vdev_op_leaf)
3409 vd->vdev_ops->vdev_op_close(vd);
3411 if (vd->vdev_removed &&
3412 state == VDEV_STATE_CANT_OPEN &&
3413 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) {
3415 * If the previous state is set to VDEV_STATE_REMOVED, then this
3416 * device was previously marked removed and someone attempted to
3417 * reopen it. If this failed due to a nonexistent device, then
3418 * keep the device in the REMOVED state. We also let this be if
3419 * it is one of our special test online cases, which is only
3420 * attempting to online the device and shouldn't generate an FMA
3423 vd->vdev_state = VDEV_STATE_REMOVED;
3424 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
3425 } else if (state == VDEV_STATE_REMOVED) {
3426 vd->vdev_removed = B_TRUE;
3427 } else if (state == VDEV_STATE_CANT_OPEN) {
3429 * If we fail to open a vdev during an import or recovery, we
3430 * mark it as "not available", which signifies that it was
3431 * never there to begin with. Failure to open such a device
3432 * is not considered an error.
3434 if ((spa_load_state(spa) == SPA_LOAD_IMPORT ||
3435 spa_load_state(spa) == SPA_LOAD_RECOVER) &&
3436 vd->vdev_ops->vdev_op_leaf)
3437 vd->vdev_not_present = 1;
3440 * Post the appropriate ereport. If the 'prevstate' field is
3441 * set to something other than VDEV_STATE_UNKNOWN, it indicates
3442 * that this is part of a vdev_reopen(). In this case, we don't
3443 * want to post the ereport if the device was already in the
3444 * CANT_OPEN state beforehand.
3446 * If the 'checkremove' flag is set, then this is an attempt to
3447 * online the device in response to an insertion event. If we
3448 * hit this case, then we have detected an insertion event for a
3449 * faulted or offline device that wasn't in the removed state.
3450 * In this scenario, we don't post an ereport because we are
3451 * about to replace the device, or attempt an online with
3452 * vdev_forcefault, which will generate the fault for us.
3454 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) &&
3455 !vd->vdev_not_present && !vd->vdev_checkremove &&
3456 vd != spa->spa_root_vdev) {
3460 case VDEV_AUX_OPEN_FAILED:
3461 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED;
3463 case VDEV_AUX_CORRUPT_DATA:
3464 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA;
3466 case VDEV_AUX_NO_REPLICAS:
3467 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS;
3469 case VDEV_AUX_BAD_GUID_SUM:
3470 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM;
3472 case VDEV_AUX_TOO_SMALL:
3473 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL;
3475 case VDEV_AUX_BAD_LABEL:
3476 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL;
3479 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN;
3482 zfs_ereport_post(class, spa, vd, NULL, save_state, 0);
3485 /* Erase any notion of persistent removed state */
3486 vd->vdev_removed = B_FALSE;
3488 vd->vdev_removed = B_FALSE;
3492 * Notify ZED of any significant state-change on a leaf vdev.
3495 if (vd->vdev_ops->vdev_op_leaf) {
3496 /* preserve original state from a vdev_reopen() */
3497 if ((vd->vdev_prevstate != VDEV_STATE_UNKNOWN) &&
3498 (vd->vdev_prevstate != vd->vdev_state) &&
3499 (save_state <= VDEV_STATE_CLOSED))
3500 save_state = vd->vdev_prevstate;
3502 /* filter out state change due to initial vdev_open */
3503 if (save_state > VDEV_STATE_CLOSED)
3504 zfs_post_state_change(spa, vd, save_state);
3507 if (!isopen && vd->vdev_parent)
3508 vdev_propagate_state(vd->vdev_parent);
3512 * Check the vdev configuration to ensure that it's capable of supporting
3516 vdev_is_bootable(vdev_t *vd)
3518 #if defined(__sun__) || defined(__sun)
3520 * Currently, we do not support RAID-Z or partial configuration.
3521 * In addition, only a single top-level vdev is allowed and none of the
3522 * leaves can be wholedisks.
3526 if (!vd->vdev_ops->vdev_op_leaf) {
3527 char *vdev_type = vd->vdev_ops->vdev_op_type;
3529 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 &&
3530 vd->vdev_children > 1) {
3532 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 ||
3533 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) {
3536 } else if (vd->vdev_wholedisk == 1) {
3540 for (c = 0; c < vd->vdev_children; c++) {
3541 if (!vdev_is_bootable(vd->vdev_child[c]))
3544 #endif /* __sun__ || __sun */
3549 * Load the state from the original vdev tree (ovd) which
3550 * we've retrieved from the MOS config object. If the original
3551 * vdev was offline or faulted then we transfer that state to the
3552 * device in the current vdev tree (nvd).
3555 vdev_load_log_state(vdev_t *nvd, vdev_t *ovd)
3559 ASSERT(nvd->vdev_top->vdev_islog);
3560 ASSERT(spa_config_held(nvd->vdev_spa,
3561 SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
3562 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid);
3564 for (c = 0; c < nvd->vdev_children; c++)
3565 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]);
3567 if (nvd->vdev_ops->vdev_op_leaf) {
3569 * Restore the persistent vdev state
3571 nvd->vdev_offline = ovd->vdev_offline;
3572 nvd->vdev_faulted = ovd->vdev_faulted;
3573 nvd->vdev_degraded = ovd->vdev_degraded;
3574 nvd->vdev_removed = ovd->vdev_removed;
3579 * Determine if a log device has valid content. If the vdev was
3580 * removed or faulted in the MOS config then we know that
3581 * the content on the log device has already been written to the pool.
3584 vdev_log_state_valid(vdev_t *vd)
3588 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted &&
3592 for (c = 0; c < vd->vdev_children; c++)
3593 if (vdev_log_state_valid(vd->vdev_child[c]))
3600 * Expand a vdev if possible.
3603 vdev_expand(vdev_t *vd, uint64_t txg)
3605 ASSERT(vd->vdev_top == vd);
3606 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
3608 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) {
3609 VERIFY(vdev_metaslab_init(vd, txg) == 0);
3610 vdev_config_dirty(vd);
3618 vdev_split(vdev_t *vd)
3620 vdev_t *cvd, *pvd = vd->vdev_parent;
3622 vdev_remove_child(pvd, vd);
3623 vdev_compact_children(pvd);
3625 cvd = pvd->vdev_child[0];
3626 if (pvd->vdev_children == 1) {
3627 vdev_remove_parent(cvd);
3628 cvd->vdev_splitting = B_TRUE;
3630 vdev_propagate_state(cvd);
3634 vdev_deadman(vdev_t *vd)
3638 for (c = 0; c < vd->vdev_children; c++) {
3639 vdev_t *cvd = vd->vdev_child[c];
3644 if (vd->vdev_ops->vdev_op_leaf) {
3645 vdev_queue_t *vq = &vd->vdev_queue;
3647 mutex_enter(&vq->vq_lock);
3648 if (avl_numnodes(&vq->vq_active_tree) > 0) {
3649 spa_t *spa = vd->vdev_spa;
3654 * Look at the head of all the pending queues,
3655 * if any I/O has been outstanding for longer than
3656 * the spa_deadman_synctime we log a zevent.
3658 fio = avl_first(&vq->vq_active_tree);
3659 delta = gethrtime() - fio->io_timestamp;
3660 if (delta > spa_deadman_synctime(spa)) {
3661 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, "
3662 "delta %lluns, last io %lluns",
3663 fio->io_timestamp, delta,
3664 vq->vq_io_complete_ts);
3665 zfs_ereport_post(FM_EREPORT_ZFS_DELAY,
3666 spa, vd, fio, 0, 0);
3669 mutex_exit(&vq->vq_lock);
3673 #if defined(_KERNEL) && defined(HAVE_SPL)
3674 EXPORT_SYMBOL(vdev_fault);
3675 EXPORT_SYMBOL(vdev_degrade);
3676 EXPORT_SYMBOL(vdev_online);
3677 EXPORT_SYMBOL(vdev_offline);
3678 EXPORT_SYMBOL(vdev_clear);
3680 module_param(metaslabs_per_vdev, int, 0644);
3681 MODULE_PARM_DESC(metaslabs_per_vdev,
3682 "Divide added vdev into approximately (but no more than) this number "