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, 2014 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>
49 * When a vdev is added, it will be divided into approximately (but no
50 * more than) this number of metaslabs.
52 int metaslabs_per_vdev
= 200;
55 * Virtual device management.
58 static vdev_ops_t
*vdev_ops_table
[] = {
72 * Given a vdev type, return the appropriate ops vector.
75 vdev_getops(const char *type
)
77 vdev_ops_t
*ops
, **opspp
;
79 for (opspp
= vdev_ops_table
; (ops
= *opspp
) != NULL
; opspp
++)
80 if (strcmp(ops
->vdev_op_type
, type
) == 0)
87 * Default asize function: return the MAX of psize with the asize of
88 * all children. This is what's used by anything other than RAID-Z.
91 vdev_default_asize(vdev_t
*vd
, uint64_t psize
)
93 uint64_t asize
= P2ROUNDUP(psize
, 1ULL << vd
->vdev_top
->vdev_ashift
);
97 for (c
= 0; c
< vd
->vdev_children
; c
++) {
98 csize
= vdev_psize_to_asize(vd
->vdev_child
[c
], psize
);
99 asize
= MAX(asize
, csize
);
106 * Get the minimum allocatable size. We define the allocatable size as
107 * the vdev's asize rounded to the nearest metaslab. This allows us to
108 * replace or attach devices which don't have the same physical size but
109 * can still satisfy the same number of allocations.
112 vdev_get_min_asize(vdev_t
*vd
)
114 vdev_t
*pvd
= vd
->vdev_parent
;
117 * If our parent is NULL (inactive spare or cache) or is the root,
118 * just return our own asize.
121 return (vd
->vdev_asize
);
124 * The top-level vdev just returns the allocatable size rounded
125 * to the nearest metaslab.
127 if (vd
== vd
->vdev_top
)
128 return (P2ALIGN(vd
->vdev_asize
, 1ULL << vd
->vdev_ms_shift
));
131 * The allocatable space for a raidz vdev is N * sizeof(smallest child),
132 * so each child must provide at least 1/Nth of its asize.
134 if (pvd
->vdev_ops
== &vdev_raidz_ops
)
135 return (pvd
->vdev_min_asize
/ pvd
->vdev_children
);
137 return (pvd
->vdev_min_asize
);
141 vdev_set_min_asize(vdev_t
*vd
)
144 vd
->vdev_min_asize
= vdev_get_min_asize(vd
);
146 for (c
= 0; c
< vd
->vdev_children
; c
++)
147 vdev_set_min_asize(vd
->vdev_child
[c
]);
151 vdev_lookup_top(spa_t
*spa
, uint64_t vdev
)
153 vdev_t
*rvd
= spa
->spa_root_vdev
;
155 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
157 if (vdev
< rvd
->vdev_children
) {
158 ASSERT(rvd
->vdev_child
[vdev
] != NULL
);
159 return (rvd
->vdev_child
[vdev
]);
166 vdev_lookup_by_guid(vdev_t
*vd
, uint64_t guid
)
171 if (vd
->vdev_guid
== guid
)
174 for (c
= 0; c
< vd
->vdev_children
; c
++)
175 if ((mvd
= vdev_lookup_by_guid(vd
->vdev_child
[c
], guid
)) !=
183 vdev_add_child(vdev_t
*pvd
, vdev_t
*cvd
)
185 size_t oldsize
, newsize
;
186 uint64_t id
= cvd
->vdev_id
;
189 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
190 ASSERT(cvd
->vdev_parent
== NULL
);
192 cvd
->vdev_parent
= pvd
;
197 ASSERT(id
>= pvd
->vdev_children
|| pvd
->vdev_child
[id
] == NULL
);
199 oldsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
200 pvd
->vdev_children
= MAX(pvd
->vdev_children
, id
+ 1);
201 newsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
203 newchild
= kmem_alloc(newsize
, KM_SLEEP
);
204 if (pvd
->vdev_child
!= NULL
) {
205 bcopy(pvd
->vdev_child
, newchild
, oldsize
);
206 kmem_free(pvd
->vdev_child
, oldsize
);
209 pvd
->vdev_child
= newchild
;
210 pvd
->vdev_child
[id
] = cvd
;
212 cvd
->vdev_top
= (pvd
->vdev_top
? pvd
->vdev_top
: cvd
);
213 ASSERT(cvd
->vdev_top
->vdev_parent
->vdev_parent
== NULL
);
216 * Walk up all ancestors to update guid sum.
218 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
219 pvd
->vdev_guid_sum
+= cvd
->vdev_guid_sum
;
223 vdev_remove_child(vdev_t
*pvd
, vdev_t
*cvd
)
226 uint_t id
= cvd
->vdev_id
;
228 ASSERT(cvd
->vdev_parent
== pvd
);
233 ASSERT(id
< pvd
->vdev_children
);
234 ASSERT(pvd
->vdev_child
[id
] == cvd
);
236 pvd
->vdev_child
[id
] = NULL
;
237 cvd
->vdev_parent
= NULL
;
239 for (c
= 0; c
< pvd
->vdev_children
; c
++)
240 if (pvd
->vdev_child
[c
])
243 if (c
== pvd
->vdev_children
) {
244 kmem_free(pvd
->vdev_child
, c
* sizeof (vdev_t
*));
245 pvd
->vdev_child
= NULL
;
246 pvd
->vdev_children
= 0;
250 * Walk up all ancestors to update guid sum.
252 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
253 pvd
->vdev_guid_sum
-= cvd
->vdev_guid_sum
;
257 * Remove any holes in the child array.
260 vdev_compact_children(vdev_t
*pvd
)
262 vdev_t
**newchild
, *cvd
;
263 int oldc
= pvd
->vdev_children
;
267 ASSERT(spa_config_held(pvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
269 for (c
= newc
= 0; c
< oldc
; c
++)
270 if (pvd
->vdev_child
[c
])
273 newchild
= kmem_zalloc(newc
* sizeof (vdev_t
*), KM_SLEEP
);
275 for (c
= newc
= 0; c
< oldc
; c
++) {
276 if ((cvd
= pvd
->vdev_child
[c
]) != NULL
) {
277 newchild
[newc
] = cvd
;
278 cvd
->vdev_id
= newc
++;
282 kmem_free(pvd
->vdev_child
, oldc
* sizeof (vdev_t
*));
283 pvd
->vdev_child
= newchild
;
284 pvd
->vdev_children
= newc
;
288 * Allocate and minimally initialize a vdev_t.
291 vdev_alloc_common(spa_t
*spa
, uint_t id
, uint64_t guid
, vdev_ops_t
*ops
)
296 vd
= kmem_zalloc(sizeof (vdev_t
), KM_SLEEP
);
298 if (spa
->spa_root_vdev
== NULL
) {
299 ASSERT(ops
== &vdev_root_ops
);
300 spa
->spa_root_vdev
= vd
;
301 spa
->spa_load_guid
= spa_generate_guid(NULL
);
304 if (guid
== 0 && ops
!= &vdev_hole_ops
) {
305 if (spa
->spa_root_vdev
== vd
) {
307 * The root vdev's guid will also be the pool guid,
308 * which must be unique among all pools.
310 guid
= spa_generate_guid(NULL
);
313 * Any other vdev's guid must be unique within the pool.
315 guid
= spa_generate_guid(spa
);
317 ASSERT(!spa_guid_exists(spa_guid(spa
), guid
));
322 vd
->vdev_guid
= guid
;
323 vd
->vdev_guid_sum
= guid
;
325 vd
->vdev_state
= VDEV_STATE_CLOSED
;
326 vd
->vdev_ishole
= (ops
== &vdev_hole_ops
);
328 list_link_init(&vd
->vdev_config_dirty_node
);
329 list_link_init(&vd
->vdev_state_dirty_node
);
330 mutex_init(&vd
->vdev_dtl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
331 mutex_init(&vd
->vdev_stat_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
332 mutex_init(&vd
->vdev_probe_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
333 for (t
= 0; t
< DTL_TYPES
; t
++) {
334 vd
->vdev_dtl
[t
] = range_tree_create(NULL
, NULL
,
337 txg_list_create(&vd
->vdev_ms_list
,
338 offsetof(struct metaslab
, ms_txg_node
));
339 txg_list_create(&vd
->vdev_dtl_list
,
340 offsetof(struct vdev
, vdev_dtl_node
));
341 vd
->vdev_stat
.vs_timestamp
= gethrtime();
349 * Allocate a new vdev. The 'alloctype' is used to control whether we are
350 * creating a new vdev or loading an existing one - the behavior is slightly
351 * different for each case.
354 vdev_alloc(spa_t
*spa
, vdev_t
**vdp
, nvlist_t
*nv
, vdev_t
*parent
, uint_t id
,
359 uint64_t guid
= 0, islog
, nparity
;
362 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
364 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_TYPE
, &type
) != 0)
365 return (SET_ERROR(EINVAL
));
367 if ((ops
= vdev_getops(type
)) == NULL
)
368 return (SET_ERROR(EINVAL
));
371 * If this is a load, get the vdev guid from the nvlist.
372 * Otherwise, vdev_alloc_common() will generate one for us.
374 if (alloctype
== VDEV_ALLOC_LOAD
) {
377 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ID
, &label_id
) ||
379 return (SET_ERROR(EINVAL
));
381 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
382 return (SET_ERROR(EINVAL
));
383 } else if (alloctype
== VDEV_ALLOC_SPARE
) {
384 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
385 return (SET_ERROR(EINVAL
));
386 } else if (alloctype
== VDEV_ALLOC_L2CACHE
) {
387 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
388 return (SET_ERROR(EINVAL
));
389 } else if (alloctype
== VDEV_ALLOC_ROOTPOOL
) {
390 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
391 return (SET_ERROR(EINVAL
));
395 * The first allocated vdev must be of type 'root'.
397 if (ops
!= &vdev_root_ops
&& spa
->spa_root_vdev
== NULL
)
398 return (SET_ERROR(EINVAL
));
401 * Determine whether we're a log vdev.
404 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_LOG
, &islog
);
405 if (islog
&& spa_version(spa
) < SPA_VERSION_SLOGS
)
406 return (SET_ERROR(ENOTSUP
));
408 if (ops
== &vdev_hole_ops
&& spa_version(spa
) < SPA_VERSION_HOLES
)
409 return (SET_ERROR(ENOTSUP
));
412 * Set the nparity property for RAID-Z vdevs.
415 if (ops
== &vdev_raidz_ops
) {
416 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NPARITY
,
418 if (nparity
== 0 || nparity
> VDEV_RAIDZ_MAXPARITY
)
419 return (SET_ERROR(EINVAL
));
421 * Previous versions could only support 1 or 2 parity
425 spa_version(spa
) < SPA_VERSION_RAIDZ2
)
426 return (SET_ERROR(ENOTSUP
));
428 spa_version(spa
) < SPA_VERSION_RAIDZ3
)
429 return (SET_ERROR(ENOTSUP
));
432 * We require the parity to be specified for SPAs that
433 * support multiple parity levels.
435 if (spa_version(spa
) >= SPA_VERSION_RAIDZ2
)
436 return (SET_ERROR(EINVAL
));
438 * Otherwise, we default to 1 parity device for RAID-Z.
445 ASSERT(nparity
!= -1ULL);
447 vd
= vdev_alloc_common(spa
, id
, guid
, ops
);
449 vd
->vdev_islog
= islog
;
450 vd
->vdev_nparity
= nparity
;
452 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PATH
, &vd
->vdev_path
) == 0)
453 vd
->vdev_path
= spa_strdup(vd
->vdev_path
);
454 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_DEVID
, &vd
->vdev_devid
) == 0)
455 vd
->vdev_devid
= spa_strdup(vd
->vdev_devid
);
456 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PHYS_PATH
,
457 &vd
->vdev_physpath
) == 0)
458 vd
->vdev_physpath
= spa_strdup(vd
->vdev_physpath
);
459 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_FRU
, &vd
->vdev_fru
) == 0)
460 vd
->vdev_fru
= spa_strdup(vd
->vdev_fru
);
463 * Set the whole_disk property. If it's not specified, leave the value
466 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_WHOLE_DISK
,
467 &vd
->vdev_wholedisk
) != 0)
468 vd
->vdev_wholedisk
= -1ULL;
471 * Look for the 'not present' flag. This will only be set if the device
472 * was not present at the time of import.
474 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NOT_PRESENT
,
475 &vd
->vdev_not_present
);
478 * Get the alignment requirement.
480 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASHIFT
, &vd
->vdev_ashift
);
483 * Retrieve the vdev creation time.
485 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_CREATE_TXG
,
489 * If we're a top-level vdev, try to load the allocation parameters.
491 if (parent
&& !parent
->vdev_parent
&&
492 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_SPLIT
)) {
493 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_ARRAY
,
495 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_SHIFT
,
497 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASIZE
,
499 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVING
,
503 if (parent
&& !parent
->vdev_parent
&& alloctype
!= VDEV_ALLOC_ATTACH
) {
504 ASSERT(alloctype
== VDEV_ALLOC_LOAD
||
505 alloctype
== VDEV_ALLOC_ADD
||
506 alloctype
== VDEV_ALLOC_SPLIT
||
507 alloctype
== VDEV_ALLOC_ROOTPOOL
);
508 vd
->vdev_mg
= metaslab_group_create(islog
?
509 spa_log_class(spa
) : spa_normal_class(spa
), vd
);
513 * If we're a leaf vdev, try to load the DTL object and other state.
515 if (vd
->vdev_ops
->vdev_op_leaf
&&
516 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_L2CACHE
||
517 alloctype
== VDEV_ALLOC_ROOTPOOL
)) {
518 if (alloctype
== VDEV_ALLOC_LOAD
) {
519 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DTL
,
520 &vd
->vdev_dtl_object
);
521 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_UNSPARE
,
525 if (alloctype
== VDEV_ALLOC_ROOTPOOL
) {
528 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_SPARE
,
529 &spare
) == 0 && spare
)
533 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_OFFLINE
,
536 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_RESILVER_TXG
,
537 &vd
->vdev_resilver_txg
);
540 * When importing a pool, we want to ignore the persistent fault
541 * state, as the diagnosis made on another system may not be
542 * valid in the current context. Local vdevs will
543 * remain in the faulted state.
545 if (spa_load_state(spa
) == SPA_LOAD_OPEN
) {
546 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_FAULTED
,
548 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DEGRADED
,
550 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVED
,
553 if (vd
->vdev_faulted
|| vd
->vdev_degraded
) {
557 VDEV_AUX_ERR_EXCEEDED
;
558 if (nvlist_lookup_string(nv
,
559 ZPOOL_CONFIG_AUX_STATE
, &aux
) == 0 &&
560 strcmp(aux
, "external") == 0)
561 vd
->vdev_label_aux
= VDEV_AUX_EXTERNAL
;
567 * Add ourselves to the parent's list of children.
569 vdev_add_child(parent
, vd
);
577 vdev_free(vdev_t
*vd
)
580 spa_t
*spa
= vd
->vdev_spa
;
583 * vdev_free() implies closing the vdev first. This is simpler than
584 * trying to ensure complicated semantics for all callers.
588 ASSERT(!list_link_active(&vd
->vdev_config_dirty_node
));
589 ASSERT(!list_link_active(&vd
->vdev_state_dirty_node
));
594 for (c
= 0; c
< vd
->vdev_children
; c
++)
595 vdev_free(vd
->vdev_child
[c
]);
597 ASSERT(vd
->vdev_child
== NULL
);
598 ASSERT(vd
->vdev_guid_sum
== vd
->vdev_guid
);
601 * Discard allocation state.
603 if (vd
->vdev_mg
!= NULL
) {
604 vdev_metaslab_fini(vd
);
605 metaslab_group_destroy(vd
->vdev_mg
);
608 ASSERT0(vd
->vdev_stat
.vs_space
);
609 ASSERT0(vd
->vdev_stat
.vs_dspace
);
610 ASSERT0(vd
->vdev_stat
.vs_alloc
);
613 * Remove this vdev from its parent's child list.
615 vdev_remove_child(vd
->vdev_parent
, vd
);
617 ASSERT(vd
->vdev_parent
== NULL
);
620 * Clean up vdev structure.
626 spa_strfree(vd
->vdev_path
);
628 spa_strfree(vd
->vdev_devid
);
629 if (vd
->vdev_physpath
)
630 spa_strfree(vd
->vdev_physpath
);
632 spa_strfree(vd
->vdev_fru
);
634 if (vd
->vdev_isspare
)
635 spa_spare_remove(vd
);
636 if (vd
->vdev_isl2cache
)
637 spa_l2cache_remove(vd
);
639 txg_list_destroy(&vd
->vdev_ms_list
);
640 txg_list_destroy(&vd
->vdev_dtl_list
);
642 mutex_enter(&vd
->vdev_dtl_lock
);
643 space_map_close(vd
->vdev_dtl_sm
);
644 for (t
= 0; t
< DTL_TYPES
; t
++) {
645 range_tree_vacate(vd
->vdev_dtl
[t
], NULL
, NULL
);
646 range_tree_destroy(vd
->vdev_dtl
[t
]);
648 mutex_exit(&vd
->vdev_dtl_lock
);
650 mutex_destroy(&vd
->vdev_dtl_lock
);
651 mutex_destroy(&vd
->vdev_stat_lock
);
652 mutex_destroy(&vd
->vdev_probe_lock
);
654 if (vd
== spa
->spa_root_vdev
)
655 spa
->spa_root_vdev
= NULL
;
657 kmem_free(vd
, sizeof (vdev_t
));
661 * Transfer top-level vdev state from svd to tvd.
664 vdev_top_transfer(vdev_t
*svd
, vdev_t
*tvd
)
666 spa_t
*spa
= svd
->vdev_spa
;
671 ASSERT(tvd
== tvd
->vdev_top
);
673 tvd
->vdev_ms_array
= svd
->vdev_ms_array
;
674 tvd
->vdev_ms_shift
= svd
->vdev_ms_shift
;
675 tvd
->vdev_ms_count
= svd
->vdev_ms_count
;
677 svd
->vdev_ms_array
= 0;
678 svd
->vdev_ms_shift
= 0;
679 svd
->vdev_ms_count
= 0;
682 ASSERT3P(tvd
->vdev_mg
, ==, svd
->vdev_mg
);
683 tvd
->vdev_mg
= svd
->vdev_mg
;
684 tvd
->vdev_ms
= svd
->vdev_ms
;
689 if (tvd
->vdev_mg
!= NULL
)
690 tvd
->vdev_mg
->mg_vd
= tvd
;
692 tvd
->vdev_stat
.vs_alloc
= svd
->vdev_stat
.vs_alloc
;
693 tvd
->vdev_stat
.vs_space
= svd
->vdev_stat
.vs_space
;
694 tvd
->vdev_stat
.vs_dspace
= svd
->vdev_stat
.vs_dspace
;
696 svd
->vdev_stat
.vs_alloc
= 0;
697 svd
->vdev_stat
.vs_space
= 0;
698 svd
->vdev_stat
.vs_dspace
= 0;
700 for (t
= 0; t
< TXG_SIZE
; t
++) {
701 while ((msp
= txg_list_remove(&svd
->vdev_ms_list
, t
)) != NULL
)
702 (void) txg_list_add(&tvd
->vdev_ms_list
, msp
, t
);
703 while ((vd
= txg_list_remove(&svd
->vdev_dtl_list
, t
)) != NULL
)
704 (void) txg_list_add(&tvd
->vdev_dtl_list
, vd
, t
);
705 if (txg_list_remove_this(&spa
->spa_vdev_txg_list
, svd
, t
))
706 (void) txg_list_add(&spa
->spa_vdev_txg_list
, tvd
, t
);
709 if (list_link_active(&svd
->vdev_config_dirty_node
)) {
710 vdev_config_clean(svd
);
711 vdev_config_dirty(tvd
);
714 if (list_link_active(&svd
->vdev_state_dirty_node
)) {
715 vdev_state_clean(svd
);
716 vdev_state_dirty(tvd
);
719 tvd
->vdev_deflate_ratio
= svd
->vdev_deflate_ratio
;
720 svd
->vdev_deflate_ratio
= 0;
722 tvd
->vdev_islog
= svd
->vdev_islog
;
727 vdev_top_update(vdev_t
*tvd
, vdev_t
*vd
)
736 for (c
= 0; c
< vd
->vdev_children
; c
++)
737 vdev_top_update(tvd
, vd
->vdev_child
[c
]);
741 * Add a mirror/replacing vdev above an existing vdev.
744 vdev_add_parent(vdev_t
*cvd
, vdev_ops_t
*ops
)
746 spa_t
*spa
= cvd
->vdev_spa
;
747 vdev_t
*pvd
= cvd
->vdev_parent
;
750 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
752 mvd
= vdev_alloc_common(spa
, cvd
->vdev_id
, 0, ops
);
754 mvd
->vdev_asize
= cvd
->vdev_asize
;
755 mvd
->vdev_min_asize
= cvd
->vdev_min_asize
;
756 mvd
->vdev_max_asize
= cvd
->vdev_max_asize
;
757 mvd
->vdev_ashift
= cvd
->vdev_ashift
;
758 mvd
->vdev_state
= cvd
->vdev_state
;
759 mvd
->vdev_crtxg
= cvd
->vdev_crtxg
;
761 vdev_remove_child(pvd
, cvd
);
762 vdev_add_child(pvd
, mvd
);
763 cvd
->vdev_id
= mvd
->vdev_children
;
764 vdev_add_child(mvd
, cvd
);
765 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
767 if (mvd
== mvd
->vdev_top
)
768 vdev_top_transfer(cvd
, mvd
);
774 * Remove a 1-way mirror/replacing vdev from the tree.
777 vdev_remove_parent(vdev_t
*cvd
)
779 vdev_t
*mvd
= cvd
->vdev_parent
;
780 vdev_t
*pvd
= mvd
->vdev_parent
;
782 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
784 ASSERT(mvd
->vdev_children
== 1);
785 ASSERT(mvd
->vdev_ops
== &vdev_mirror_ops
||
786 mvd
->vdev_ops
== &vdev_replacing_ops
||
787 mvd
->vdev_ops
== &vdev_spare_ops
);
788 cvd
->vdev_ashift
= mvd
->vdev_ashift
;
790 vdev_remove_child(mvd
, cvd
);
791 vdev_remove_child(pvd
, mvd
);
794 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
795 * Otherwise, we could have detached an offline device, and when we
796 * go to import the pool we'll think we have two top-level vdevs,
797 * instead of a different version of the same top-level vdev.
799 if (mvd
->vdev_top
== mvd
) {
800 uint64_t guid_delta
= mvd
->vdev_guid
- cvd
->vdev_guid
;
801 cvd
->vdev_orig_guid
= cvd
->vdev_guid
;
802 cvd
->vdev_guid
+= guid_delta
;
803 cvd
->vdev_guid_sum
+= guid_delta
;
806 * If pool not set for autoexpand, we need to also preserve
807 * mvd's asize to prevent automatic expansion of cvd.
808 * Otherwise if we are adjusting the mirror by attaching and
809 * detaching children of non-uniform sizes, the mirror could
810 * autoexpand, unexpectedly requiring larger devices to
811 * re-establish the mirror.
813 if (!cvd
->vdev_spa
->spa_autoexpand
)
814 cvd
->vdev_asize
= mvd
->vdev_asize
;
816 cvd
->vdev_id
= mvd
->vdev_id
;
817 vdev_add_child(pvd
, cvd
);
818 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
820 if (cvd
== cvd
->vdev_top
)
821 vdev_top_transfer(mvd
, cvd
);
823 ASSERT(mvd
->vdev_children
== 0);
828 vdev_metaslab_init(vdev_t
*vd
, uint64_t txg
)
830 spa_t
*spa
= vd
->vdev_spa
;
831 objset_t
*mos
= spa
->spa_meta_objset
;
833 uint64_t oldc
= vd
->vdev_ms_count
;
834 uint64_t newc
= vd
->vdev_asize
>> vd
->vdev_ms_shift
;
838 ASSERT(txg
== 0 || spa_config_held(spa
, SCL_ALLOC
, RW_WRITER
));
841 * This vdev is not being allocated from yet or is a hole.
843 if (vd
->vdev_ms_shift
== 0)
846 ASSERT(!vd
->vdev_ishole
);
849 * Compute the raidz-deflation ratio. Note, we hard-code
850 * in 128k (1 << 17) because it is the "typical" blocksize.
851 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change,
852 * otherwise it would inconsistently account for existing bp's.
854 vd
->vdev_deflate_ratio
= (1 << 17) /
855 (vdev_psize_to_asize(vd
, 1 << 17) >> SPA_MINBLOCKSHIFT
);
857 ASSERT(oldc
<= newc
);
859 mspp
= kmem_zalloc(newc
* sizeof (*mspp
), KM_SLEEP
);
862 bcopy(vd
->vdev_ms
, mspp
, oldc
* sizeof (*mspp
));
863 kmem_free(vd
->vdev_ms
, oldc
* sizeof (*mspp
));
867 vd
->vdev_ms_count
= newc
;
869 for (m
= oldc
; m
< newc
; m
++) {
873 error
= dmu_read(mos
, vd
->vdev_ms_array
,
874 m
* sizeof (uint64_t), sizeof (uint64_t), &object
,
880 error
= metaslab_init(vd
->vdev_mg
, m
, object
, txg
,
887 spa_config_enter(spa
, SCL_ALLOC
, FTAG
, RW_WRITER
);
890 * If the vdev is being removed we don't activate
891 * the metaslabs since we want to ensure that no new
892 * allocations are performed on this device.
894 if (oldc
== 0 && !vd
->vdev_removing
)
895 metaslab_group_activate(vd
->vdev_mg
);
898 spa_config_exit(spa
, SCL_ALLOC
, FTAG
);
904 vdev_metaslab_fini(vdev_t
*vd
)
907 uint64_t count
= vd
->vdev_ms_count
;
909 if (vd
->vdev_ms
!= NULL
) {
910 metaslab_group_passivate(vd
->vdev_mg
);
911 for (m
= 0; m
< count
; m
++) {
912 metaslab_t
*msp
= vd
->vdev_ms
[m
];
917 kmem_free(vd
->vdev_ms
, count
* sizeof (metaslab_t
*));
921 ASSERT3U(vd
->vdev_pending_fastwrite
, ==, 0);
924 typedef struct vdev_probe_stats
{
925 boolean_t vps_readable
;
926 boolean_t vps_writeable
;
928 } vdev_probe_stats_t
;
931 vdev_probe_done(zio_t
*zio
)
933 spa_t
*spa
= zio
->io_spa
;
934 vdev_t
*vd
= zio
->io_vd
;
935 vdev_probe_stats_t
*vps
= zio
->io_private
;
937 ASSERT(vd
->vdev_probe_zio
!= NULL
);
939 if (zio
->io_type
== ZIO_TYPE_READ
) {
940 if (zio
->io_error
== 0)
941 vps
->vps_readable
= 1;
942 if (zio
->io_error
== 0 && spa_writeable(spa
)) {
943 zio_nowait(zio_write_phys(vd
->vdev_probe_zio
, vd
,
944 zio
->io_offset
, zio
->io_size
, zio
->io_data
,
945 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
946 ZIO_PRIORITY_SYNC_WRITE
, vps
->vps_flags
, B_TRUE
));
948 zio_buf_free(zio
->io_data
, zio
->io_size
);
950 } else if (zio
->io_type
== ZIO_TYPE_WRITE
) {
951 if (zio
->io_error
== 0)
952 vps
->vps_writeable
= 1;
953 zio_buf_free(zio
->io_data
, zio
->io_size
);
954 } else if (zio
->io_type
== ZIO_TYPE_NULL
) {
957 vd
->vdev_cant_read
|= !vps
->vps_readable
;
958 vd
->vdev_cant_write
|= !vps
->vps_writeable
;
960 if (vdev_readable(vd
) &&
961 (vdev_writeable(vd
) || !spa_writeable(spa
))) {
964 ASSERT(zio
->io_error
!= 0);
965 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE
,
966 spa
, vd
, NULL
, 0, 0);
967 zio
->io_error
= SET_ERROR(ENXIO
);
970 mutex_enter(&vd
->vdev_probe_lock
);
971 ASSERT(vd
->vdev_probe_zio
== zio
);
972 vd
->vdev_probe_zio
= NULL
;
973 mutex_exit(&vd
->vdev_probe_lock
);
975 while ((pio
= zio_walk_parents(zio
)) != NULL
)
976 if (!vdev_accessible(vd
, pio
))
977 pio
->io_error
= SET_ERROR(ENXIO
);
979 kmem_free(vps
, sizeof (*vps
));
984 * Determine whether this device is accessible.
986 * Read and write to several known locations: the pad regions of each
987 * vdev label but the first, which we leave alone in case it contains
991 vdev_probe(vdev_t
*vd
, zio_t
*zio
)
993 spa_t
*spa
= vd
->vdev_spa
;
994 vdev_probe_stats_t
*vps
= NULL
;
998 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
1001 * Don't probe the probe.
1003 if (zio
&& (zio
->io_flags
& ZIO_FLAG_PROBE
))
1007 * To prevent 'probe storms' when a device fails, we create
1008 * just one probe i/o at a time. All zios that want to probe
1009 * this vdev will become parents of the probe io.
1011 mutex_enter(&vd
->vdev_probe_lock
);
1013 if ((pio
= vd
->vdev_probe_zio
) == NULL
) {
1014 vps
= kmem_zalloc(sizeof (*vps
), KM_SLEEP
);
1016 vps
->vps_flags
= ZIO_FLAG_CANFAIL
| ZIO_FLAG_PROBE
|
1017 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
|
1020 if (spa_config_held(spa
, SCL_ZIO
, RW_WRITER
)) {
1022 * vdev_cant_read and vdev_cant_write can only
1023 * transition from TRUE to FALSE when we have the
1024 * SCL_ZIO lock as writer; otherwise they can only
1025 * transition from FALSE to TRUE. This ensures that
1026 * any zio looking at these values can assume that
1027 * failures persist for the life of the I/O. That's
1028 * important because when a device has intermittent
1029 * connectivity problems, we want to ensure that
1030 * they're ascribed to the device (ENXIO) and not
1033 * Since we hold SCL_ZIO as writer here, clear both
1034 * values so the probe can reevaluate from first
1037 vps
->vps_flags
|= ZIO_FLAG_CONFIG_WRITER
;
1038 vd
->vdev_cant_read
= B_FALSE
;
1039 vd
->vdev_cant_write
= B_FALSE
;
1042 vd
->vdev_probe_zio
= pio
= zio_null(NULL
, spa
, vd
,
1043 vdev_probe_done
, vps
,
1044 vps
->vps_flags
| ZIO_FLAG_DONT_PROPAGATE
);
1047 * We can't change the vdev state in this context, so we
1048 * kick off an async task to do it on our behalf.
1051 vd
->vdev_probe_wanted
= B_TRUE
;
1052 spa_async_request(spa
, SPA_ASYNC_PROBE
);
1057 zio_add_child(zio
, pio
);
1059 mutex_exit(&vd
->vdev_probe_lock
);
1062 ASSERT(zio
!= NULL
);
1066 for (l
= 1; l
< VDEV_LABELS
; l
++) {
1067 zio_nowait(zio_read_phys(pio
, vd
,
1068 vdev_label_offset(vd
->vdev_psize
, l
,
1069 offsetof(vdev_label_t
, vl_pad2
)),
1070 VDEV_PAD_SIZE
, zio_buf_alloc(VDEV_PAD_SIZE
),
1071 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
1072 ZIO_PRIORITY_SYNC_READ
, vps
->vps_flags
, B_TRUE
));
1083 vdev_open_child(void *arg
)
1087 vd
->vdev_open_thread
= curthread
;
1088 vd
->vdev_open_error
= vdev_open(vd
);
1089 vd
->vdev_open_thread
= NULL
;
1093 vdev_uses_zvols(vdev_t
*vd
)
1098 if (zvol_is_zvol(vd
->vdev_path
))
1102 for (c
= 0; c
< vd
->vdev_children
; c
++)
1103 if (vdev_uses_zvols(vd
->vdev_child
[c
]))
1110 vdev_open_children(vdev_t
*vd
)
1113 int children
= vd
->vdev_children
;
1117 * in order to handle pools on top of zvols, do the opens
1118 * in a single thread so that the same thread holds the
1119 * spa_namespace_lock
1121 if (vdev_uses_zvols(vd
)) {
1122 for (c
= 0; c
< children
; c
++)
1123 vd
->vdev_child
[c
]->vdev_open_error
=
1124 vdev_open(vd
->vdev_child
[c
]);
1127 tq
= taskq_create("vdev_open", children
, minclsyspri
,
1128 children
, children
, TASKQ_PREPOPULATE
);
1130 for (c
= 0; c
< children
; c
++)
1131 VERIFY(taskq_dispatch(tq
, vdev_open_child
, vd
->vdev_child
[c
],
1138 * Prepare a virtual device for access.
1141 vdev_open(vdev_t
*vd
)
1143 spa_t
*spa
= vd
->vdev_spa
;
1146 uint64_t max_osize
= 0;
1147 uint64_t asize
, max_asize
, psize
;
1148 uint64_t ashift
= 0;
1151 ASSERT(vd
->vdev_open_thread
== curthread
||
1152 spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1153 ASSERT(vd
->vdev_state
== VDEV_STATE_CLOSED
||
1154 vd
->vdev_state
== VDEV_STATE_CANT_OPEN
||
1155 vd
->vdev_state
== VDEV_STATE_OFFLINE
);
1157 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1158 vd
->vdev_cant_read
= B_FALSE
;
1159 vd
->vdev_cant_write
= B_FALSE
;
1160 vd
->vdev_min_asize
= vdev_get_min_asize(vd
);
1163 * If this vdev is not removed, check its fault status. If it's
1164 * faulted, bail out of the open.
1166 if (!vd
->vdev_removed
&& vd
->vdev_faulted
) {
1167 ASSERT(vd
->vdev_children
== 0);
1168 ASSERT(vd
->vdev_label_aux
== VDEV_AUX_ERR_EXCEEDED
||
1169 vd
->vdev_label_aux
== VDEV_AUX_EXTERNAL
);
1170 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1171 vd
->vdev_label_aux
);
1172 return (SET_ERROR(ENXIO
));
1173 } else if (vd
->vdev_offline
) {
1174 ASSERT(vd
->vdev_children
== 0);
1175 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_OFFLINE
, VDEV_AUX_NONE
);
1176 return (SET_ERROR(ENXIO
));
1179 error
= vd
->vdev_ops
->vdev_op_open(vd
, &osize
, &max_osize
, &ashift
);
1182 * Reset the vdev_reopening flag so that we actually close
1183 * the vdev on error.
1185 vd
->vdev_reopening
= B_FALSE
;
1186 if (zio_injection_enabled
&& error
== 0)
1187 error
= zio_handle_device_injection(vd
, NULL
, ENXIO
);
1190 if (vd
->vdev_removed
&&
1191 vd
->vdev_stat
.vs_aux
!= VDEV_AUX_OPEN_FAILED
)
1192 vd
->vdev_removed
= B_FALSE
;
1194 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1195 vd
->vdev_stat
.vs_aux
);
1199 vd
->vdev_removed
= B_FALSE
;
1202 * Recheck the faulted flag now that we have confirmed that
1203 * the vdev is accessible. If we're faulted, bail.
1205 if (vd
->vdev_faulted
) {
1206 ASSERT(vd
->vdev_children
== 0);
1207 ASSERT(vd
->vdev_label_aux
== VDEV_AUX_ERR_EXCEEDED
||
1208 vd
->vdev_label_aux
== VDEV_AUX_EXTERNAL
);
1209 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1210 vd
->vdev_label_aux
);
1211 return (SET_ERROR(ENXIO
));
1214 if (vd
->vdev_degraded
) {
1215 ASSERT(vd
->vdev_children
== 0);
1216 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
1217 VDEV_AUX_ERR_EXCEEDED
);
1219 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_HEALTHY
, 0);
1223 * For hole or missing vdevs we just return success.
1225 if (vd
->vdev_ishole
|| vd
->vdev_ops
== &vdev_missing_ops
)
1228 for (c
= 0; c
< vd
->vdev_children
; c
++) {
1229 if (vd
->vdev_child
[c
]->vdev_state
!= VDEV_STATE_HEALTHY
) {
1230 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
1236 osize
= P2ALIGN(osize
, (uint64_t)sizeof (vdev_label_t
));
1237 max_osize
= P2ALIGN(max_osize
, (uint64_t)sizeof (vdev_label_t
));
1239 if (vd
->vdev_children
== 0) {
1240 if (osize
< SPA_MINDEVSIZE
) {
1241 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1242 VDEV_AUX_TOO_SMALL
);
1243 return (SET_ERROR(EOVERFLOW
));
1246 asize
= osize
- (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
);
1247 max_asize
= max_osize
- (VDEV_LABEL_START_SIZE
+
1248 VDEV_LABEL_END_SIZE
);
1250 if (vd
->vdev_parent
!= NULL
&& osize
< SPA_MINDEVSIZE
-
1251 (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
)) {
1252 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1253 VDEV_AUX_TOO_SMALL
);
1254 return (SET_ERROR(EOVERFLOW
));
1258 max_asize
= max_osize
;
1261 vd
->vdev_psize
= psize
;
1264 * Make sure the allocatable size hasn't shrunk.
1266 if (asize
< vd
->vdev_min_asize
) {
1267 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1268 VDEV_AUX_BAD_LABEL
);
1269 return (SET_ERROR(EINVAL
));
1272 if (vd
->vdev_asize
== 0) {
1274 * This is the first-ever open, so use the computed values.
1275 * For compatibility, a different ashift can be requested.
1277 vd
->vdev_asize
= asize
;
1278 vd
->vdev_max_asize
= max_asize
;
1279 if (vd
->vdev_ashift
== 0)
1280 vd
->vdev_ashift
= ashift
;
1283 * Detect if the alignment requirement has increased.
1284 * We don't want to make the pool unavailable, just
1285 * post an event instead.
1287 if (ashift
> vd
->vdev_top
->vdev_ashift
&&
1288 vd
->vdev_ops
->vdev_op_leaf
) {
1289 zfs_ereport_post(FM_EREPORT_ZFS_DEVICE_BAD_ASHIFT
,
1290 spa
, vd
, NULL
, 0, 0);
1293 vd
->vdev_max_asize
= max_asize
;
1297 * If all children are healthy and the asize has increased,
1298 * then we've experienced dynamic LUN growth. If automatic
1299 * expansion is enabled then use the additional space.
1301 if (vd
->vdev_state
== VDEV_STATE_HEALTHY
&& asize
> vd
->vdev_asize
&&
1302 (vd
->vdev_expanding
|| spa
->spa_autoexpand
))
1303 vd
->vdev_asize
= asize
;
1305 vdev_set_min_asize(vd
);
1308 * Ensure we can issue some IO before declaring the
1309 * vdev open for business.
1311 if (vd
->vdev_ops
->vdev_op_leaf
&&
1312 (error
= zio_wait(vdev_probe(vd
, NULL
))) != 0) {
1313 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1314 VDEV_AUX_ERR_EXCEEDED
);
1319 * If a leaf vdev has a DTL, and seems healthy, then kick off a
1320 * resilver. But don't do this if we are doing a reopen for a scrub,
1321 * since this would just restart the scrub we are already doing.
1323 if (vd
->vdev_ops
->vdev_op_leaf
&& !spa
->spa_scrub_reopen
&&
1324 vdev_resilver_needed(vd
, NULL
, NULL
))
1325 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
1331 * Called once the vdevs are all opened, this routine validates the label
1332 * contents. This needs to be done before vdev_load() so that we don't
1333 * inadvertently do repair I/Os to the wrong device.
1335 * If 'strict' is false ignore the spa guid check. This is necessary because
1336 * if the machine crashed during a re-guid the new guid might have been written
1337 * to all of the vdev labels, but not the cached config. The strict check
1338 * will be performed when the pool is opened again using the mos config.
1340 * This function will only return failure if one of the vdevs indicates that it
1341 * has since been destroyed or exported. This is only possible if
1342 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
1343 * will be updated but the function will return 0.
1346 vdev_validate(vdev_t
*vd
, boolean_t strict
)
1348 spa_t
*spa
= vd
->vdev_spa
;
1350 uint64_t guid
= 0, top_guid
;
1354 for (c
= 0; c
< vd
->vdev_children
; c
++)
1355 if (vdev_validate(vd
->vdev_child
[c
], strict
) != 0)
1356 return (SET_ERROR(EBADF
));
1359 * If the device has already failed, or was marked offline, don't do
1360 * any further validation. Otherwise, label I/O will fail and we will
1361 * overwrite the previous state.
1363 if (vd
->vdev_ops
->vdev_op_leaf
&& vdev_readable(vd
)) {
1364 uint64_t aux_guid
= 0;
1366 uint64_t txg
= spa_last_synced_txg(spa
) != 0 ?
1367 spa_last_synced_txg(spa
) : -1ULL;
1369 if ((label
= vdev_label_read_config(vd
, txg
)) == NULL
) {
1370 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1371 VDEV_AUX_BAD_LABEL
);
1376 * Determine if this vdev has been split off into another
1377 * pool. If so, then refuse to open it.
1379 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_SPLIT_GUID
,
1380 &aux_guid
) == 0 && aux_guid
== spa_guid(spa
)) {
1381 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1382 VDEV_AUX_SPLIT_POOL
);
1387 if (strict
&& (nvlist_lookup_uint64(label
,
1388 ZPOOL_CONFIG_POOL_GUID
, &guid
) != 0 ||
1389 guid
!= spa_guid(spa
))) {
1390 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1391 VDEV_AUX_CORRUPT_DATA
);
1396 if (nvlist_lookup_nvlist(label
, ZPOOL_CONFIG_VDEV_TREE
, &nvl
)
1397 != 0 || nvlist_lookup_uint64(nvl
, ZPOOL_CONFIG_ORIG_GUID
,
1402 * If this vdev just became a top-level vdev because its
1403 * sibling was detached, it will have adopted the parent's
1404 * vdev guid -- but the label may or may not be on disk yet.
1405 * Fortunately, either version of the label will have the
1406 * same top guid, so if we're a top-level vdev, we can
1407 * safely compare to that instead.
1409 * If we split this vdev off instead, then we also check the
1410 * original pool's guid. We don't want to consider the vdev
1411 * corrupt if it is partway through a split operation.
1413 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
,
1415 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_TOP_GUID
,
1417 ((vd
->vdev_guid
!= guid
&& vd
->vdev_guid
!= aux_guid
) &&
1418 (vd
->vdev_guid
!= top_guid
|| vd
!= vd
->vdev_top
))) {
1419 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1420 VDEV_AUX_CORRUPT_DATA
);
1425 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
,
1427 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1428 VDEV_AUX_CORRUPT_DATA
);
1436 * If this is a verbatim import, no need to check the
1437 * state of the pool.
1439 if (!(spa
->spa_import_flags
& ZFS_IMPORT_VERBATIM
) &&
1440 spa_load_state(spa
) == SPA_LOAD_OPEN
&&
1441 state
!= POOL_STATE_ACTIVE
)
1442 return (SET_ERROR(EBADF
));
1445 * If we were able to open and validate a vdev that was
1446 * previously marked permanently unavailable, clear that state
1449 if (vd
->vdev_not_present
)
1450 vd
->vdev_not_present
= 0;
1457 * Close a virtual device.
1460 vdev_close(vdev_t
*vd
)
1462 vdev_t
*pvd
= vd
->vdev_parent
;
1463 ASSERTV(spa_t
*spa
= vd
->vdev_spa
);
1465 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1468 * If our parent is reopening, then we are as well, unless we are
1471 if (pvd
!= NULL
&& pvd
->vdev_reopening
)
1472 vd
->vdev_reopening
= (pvd
->vdev_reopening
&& !vd
->vdev_offline
);
1474 vd
->vdev_ops
->vdev_op_close(vd
);
1476 vdev_cache_purge(vd
);
1479 * We record the previous state before we close it, so that if we are
1480 * doing a reopen(), we don't generate FMA ereports if we notice that
1481 * it's still faulted.
1483 vd
->vdev_prevstate
= vd
->vdev_state
;
1485 if (vd
->vdev_offline
)
1486 vd
->vdev_state
= VDEV_STATE_OFFLINE
;
1488 vd
->vdev_state
= VDEV_STATE_CLOSED
;
1489 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1493 vdev_hold(vdev_t
*vd
)
1495 spa_t
*spa
= vd
->vdev_spa
;
1498 ASSERT(spa_is_root(spa
));
1499 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1502 for (c
= 0; c
< vd
->vdev_children
; c
++)
1503 vdev_hold(vd
->vdev_child
[c
]);
1505 if (vd
->vdev_ops
->vdev_op_leaf
)
1506 vd
->vdev_ops
->vdev_op_hold(vd
);
1510 vdev_rele(vdev_t
*vd
)
1514 ASSERT(spa_is_root(vd
->vdev_spa
));
1515 for (c
= 0; c
< vd
->vdev_children
; c
++)
1516 vdev_rele(vd
->vdev_child
[c
]);
1518 if (vd
->vdev_ops
->vdev_op_leaf
)
1519 vd
->vdev_ops
->vdev_op_rele(vd
);
1523 * Reopen all interior vdevs and any unopened leaves. We don't actually
1524 * reopen leaf vdevs which had previously been opened as they might deadlock
1525 * on the spa_config_lock. Instead we only obtain the leaf's physical size.
1526 * If the leaf has never been opened then open it, as usual.
1529 vdev_reopen(vdev_t
*vd
)
1531 spa_t
*spa
= vd
->vdev_spa
;
1533 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1535 /* set the reopening flag unless we're taking the vdev offline */
1536 vd
->vdev_reopening
= !vd
->vdev_offline
;
1538 (void) vdev_open(vd
);
1541 * Call vdev_validate() here to make sure we have the same device.
1542 * Otherwise, a device with an invalid label could be successfully
1543 * opened in response to vdev_reopen().
1546 (void) vdev_validate_aux(vd
);
1547 if (vdev_readable(vd
) && vdev_writeable(vd
) &&
1548 vd
->vdev_aux
== &spa
->spa_l2cache
&&
1549 !l2arc_vdev_present(vd
))
1550 l2arc_add_vdev(spa
, vd
);
1552 (void) vdev_validate(vd
, B_TRUE
);
1556 * Reassess parent vdev's health.
1558 vdev_propagate_state(vd
);
1562 vdev_create(vdev_t
*vd
, uint64_t txg
, boolean_t isreplacing
)
1567 * Normally, partial opens (e.g. of a mirror) are allowed.
1568 * For a create, however, we want to fail the request if
1569 * there are any components we can't open.
1571 error
= vdev_open(vd
);
1573 if (error
|| vd
->vdev_state
!= VDEV_STATE_HEALTHY
) {
1575 return (error
? error
: ENXIO
);
1579 * Recursively load DTLs and initialize all labels.
1581 if ((error
= vdev_dtl_load(vd
)) != 0 ||
1582 (error
= vdev_label_init(vd
, txg
, isreplacing
?
1583 VDEV_LABEL_REPLACE
: VDEV_LABEL_CREATE
)) != 0) {
1592 vdev_metaslab_set_size(vdev_t
*vd
)
1595 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev.
1597 vd
->vdev_ms_shift
= highbit64(vd
->vdev_asize
/ metaslabs_per_vdev
);
1598 vd
->vdev_ms_shift
= MAX(vd
->vdev_ms_shift
, SPA_MAXBLOCKSHIFT
);
1602 vdev_dirty(vdev_t
*vd
, int flags
, void *arg
, uint64_t txg
)
1604 ASSERT(vd
== vd
->vdev_top
);
1605 ASSERT(!vd
->vdev_ishole
);
1606 ASSERT(ISP2(flags
));
1607 ASSERT(spa_writeable(vd
->vdev_spa
));
1609 if (flags
& VDD_METASLAB
)
1610 (void) txg_list_add(&vd
->vdev_ms_list
, arg
, txg
);
1612 if (flags
& VDD_DTL
)
1613 (void) txg_list_add(&vd
->vdev_dtl_list
, arg
, txg
);
1615 (void) txg_list_add(&vd
->vdev_spa
->spa_vdev_txg_list
, vd
, txg
);
1619 vdev_dirty_leaves(vdev_t
*vd
, int flags
, uint64_t txg
)
1623 for (c
= 0; c
< vd
->vdev_children
; c
++)
1624 vdev_dirty_leaves(vd
->vdev_child
[c
], flags
, txg
);
1626 if (vd
->vdev_ops
->vdev_op_leaf
)
1627 vdev_dirty(vd
->vdev_top
, flags
, vd
, txg
);
1633 * A vdev's DTL (dirty time log) is the set of transaction groups for which
1634 * the vdev has less than perfect replication. There are four kinds of DTL:
1636 * DTL_MISSING: txgs for which the vdev has no valid copies of the data
1638 * DTL_PARTIAL: txgs for which data is available, but not fully replicated
1640 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
1641 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
1642 * txgs that was scrubbed.
1644 * DTL_OUTAGE: txgs which cannot currently be read, whether due to
1645 * persistent errors or just some device being offline.
1646 * Unlike the other three, the DTL_OUTAGE map is not generally
1647 * maintained; it's only computed when needed, typically to
1648 * determine whether a device can be detached.
1650 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
1651 * either has the data or it doesn't.
1653 * For interior vdevs such as mirror and RAID-Z the picture is more complex.
1654 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
1655 * if any child is less than fully replicated, then so is its parent.
1656 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
1657 * comprising only those txgs which appear in 'maxfaults' or more children;
1658 * those are the txgs we don't have enough replication to read. For example,
1659 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
1660 * thus, its DTL_MISSING consists of the set of txgs that appear in more than
1661 * two child DTL_MISSING maps.
1663 * It should be clear from the above that to compute the DTLs and outage maps
1664 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
1665 * Therefore, that is all we keep on disk. When loading the pool, or after
1666 * a configuration change, we generate all other DTLs from first principles.
1669 vdev_dtl_dirty(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
1671 range_tree_t
*rt
= vd
->vdev_dtl
[t
];
1673 ASSERT(t
< DTL_TYPES
);
1674 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
1675 ASSERT(spa_writeable(vd
->vdev_spa
));
1677 mutex_enter(rt
->rt_lock
);
1678 if (!range_tree_contains(rt
, txg
, size
))
1679 range_tree_add(rt
, txg
, size
);
1680 mutex_exit(rt
->rt_lock
);
1684 vdev_dtl_contains(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
1686 range_tree_t
*rt
= vd
->vdev_dtl
[t
];
1687 boolean_t dirty
= B_FALSE
;
1689 ASSERT(t
< DTL_TYPES
);
1690 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
1692 mutex_enter(rt
->rt_lock
);
1693 if (range_tree_space(rt
) != 0)
1694 dirty
= range_tree_contains(rt
, txg
, size
);
1695 mutex_exit(rt
->rt_lock
);
1701 vdev_dtl_empty(vdev_t
*vd
, vdev_dtl_type_t t
)
1703 range_tree_t
*rt
= vd
->vdev_dtl
[t
];
1706 mutex_enter(rt
->rt_lock
);
1707 empty
= (range_tree_space(rt
) == 0);
1708 mutex_exit(rt
->rt_lock
);
1714 * Returns the lowest txg in the DTL range.
1717 vdev_dtl_min(vdev_t
*vd
)
1721 ASSERT(MUTEX_HELD(&vd
->vdev_dtl_lock
));
1722 ASSERT3U(range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]), !=, 0);
1723 ASSERT0(vd
->vdev_children
);
1725 rs
= avl_first(&vd
->vdev_dtl
[DTL_MISSING
]->rt_root
);
1726 return (rs
->rs_start
- 1);
1730 * Returns the highest txg in the DTL.
1733 vdev_dtl_max(vdev_t
*vd
)
1737 ASSERT(MUTEX_HELD(&vd
->vdev_dtl_lock
));
1738 ASSERT3U(range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]), !=, 0);
1739 ASSERT0(vd
->vdev_children
);
1741 rs
= avl_last(&vd
->vdev_dtl
[DTL_MISSING
]->rt_root
);
1742 return (rs
->rs_end
);
1746 * Determine if a resilvering vdev should remove any DTL entries from
1747 * its range. If the vdev was resilvering for the entire duration of the
1748 * scan then it should excise that range from its DTLs. Otherwise, this
1749 * vdev is considered partially resilvered and should leave its DTL
1750 * entries intact. The comment in vdev_dtl_reassess() describes how we
1754 vdev_dtl_should_excise(vdev_t
*vd
)
1756 spa_t
*spa
= vd
->vdev_spa
;
1757 dsl_scan_t
*scn
= spa
->spa_dsl_pool
->dp_scan
;
1759 ASSERT0(scn
->scn_phys
.scn_errors
);
1760 ASSERT0(vd
->vdev_children
);
1762 if (vd
->vdev_resilver_txg
== 0 ||
1763 range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]) == 0)
1767 * When a resilver is initiated the scan will assign the scn_max_txg
1768 * value to the highest txg value that exists in all DTLs. If this
1769 * device's max DTL is not part of this scan (i.e. it is not in
1770 * the range (scn_min_txg, scn_max_txg] then it is not eligible
1773 if (vdev_dtl_max(vd
) <= scn
->scn_phys
.scn_max_txg
) {
1774 ASSERT3U(scn
->scn_phys
.scn_min_txg
, <=, vdev_dtl_min(vd
));
1775 ASSERT3U(scn
->scn_phys
.scn_min_txg
, <, vd
->vdev_resilver_txg
);
1776 ASSERT3U(vd
->vdev_resilver_txg
, <=, scn
->scn_phys
.scn_max_txg
);
1783 * Reassess DTLs after a config change or scrub completion.
1786 vdev_dtl_reassess(vdev_t
*vd
, uint64_t txg
, uint64_t scrub_txg
, int scrub_done
)
1788 spa_t
*spa
= vd
->vdev_spa
;
1792 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
1794 for (c
= 0; c
< vd
->vdev_children
; c
++)
1795 vdev_dtl_reassess(vd
->vdev_child
[c
], txg
,
1796 scrub_txg
, scrub_done
);
1798 if (vd
== spa
->spa_root_vdev
|| vd
->vdev_ishole
|| vd
->vdev_aux
)
1801 if (vd
->vdev_ops
->vdev_op_leaf
) {
1802 dsl_scan_t
*scn
= spa
->spa_dsl_pool
->dp_scan
;
1804 mutex_enter(&vd
->vdev_dtl_lock
);
1807 * If we've completed a scan cleanly then determine
1808 * if this vdev should remove any DTLs. We only want to
1809 * excise regions on vdevs that were available during
1810 * the entire duration of this scan.
1812 if (scrub_txg
!= 0 &&
1813 (spa
->spa_scrub_started
||
1814 (scn
!= NULL
&& scn
->scn_phys
.scn_errors
== 0)) &&
1815 vdev_dtl_should_excise(vd
)) {
1817 * We completed a scrub up to scrub_txg. If we
1818 * did it without rebooting, then the scrub dtl
1819 * will be valid, so excise the old region and
1820 * fold in the scrub dtl. Otherwise, leave the
1821 * dtl as-is if there was an error.
1823 * There's little trick here: to excise the beginning
1824 * of the DTL_MISSING map, we put it into a reference
1825 * tree and then add a segment with refcnt -1 that
1826 * covers the range [0, scrub_txg). This means
1827 * that each txg in that range has refcnt -1 or 0.
1828 * We then add DTL_SCRUB with a refcnt of 2, so that
1829 * entries in the range [0, scrub_txg) will have a
1830 * positive refcnt -- either 1 or 2. We then convert
1831 * the reference tree into the new DTL_MISSING map.
1833 space_reftree_create(&reftree
);
1834 space_reftree_add_map(&reftree
,
1835 vd
->vdev_dtl
[DTL_MISSING
], 1);
1836 space_reftree_add_seg(&reftree
, 0, scrub_txg
, -1);
1837 space_reftree_add_map(&reftree
,
1838 vd
->vdev_dtl
[DTL_SCRUB
], 2);
1839 space_reftree_generate_map(&reftree
,
1840 vd
->vdev_dtl
[DTL_MISSING
], 1);
1841 space_reftree_destroy(&reftree
);
1843 range_tree_vacate(vd
->vdev_dtl
[DTL_PARTIAL
], NULL
, NULL
);
1844 range_tree_walk(vd
->vdev_dtl
[DTL_MISSING
],
1845 range_tree_add
, vd
->vdev_dtl
[DTL_PARTIAL
]);
1847 range_tree_vacate(vd
->vdev_dtl
[DTL_SCRUB
], NULL
, NULL
);
1848 range_tree_vacate(vd
->vdev_dtl
[DTL_OUTAGE
], NULL
, NULL
);
1849 if (!vdev_readable(vd
))
1850 range_tree_add(vd
->vdev_dtl
[DTL_OUTAGE
], 0, -1ULL);
1852 range_tree_walk(vd
->vdev_dtl
[DTL_MISSING
],
1853 range_tree_add
, vd
->vdev_dtl
[DTL_OUTAGE
]);
1856 * If the vdev was resilvering and no longer has any
1857 * DTLs then reset its resilvering flag.
1859 if (vd
->vdev_resilver_txg
!= 0 &&
1860 range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]) == 0 &&
1861 range_tree_space(vd
->vdev_dtl
[DTL_OUTAGE
]) == 0)
1862 vd
->vdev_resilver_txg
= 0;
1864 mutex_exit(&vd
->vdev_dtl_lock
);
1867 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, txg
);
1871 mutex_enter(&vd
->vdev_dtl_lock
);
1872 for (t
= 0; t
< DTL_TYPES
; t
++) {
1875 /* account for child's outage in parent's missing map */
1876 int s
= (t
== DTL_MISSING
) ? DTL_OUTAGE
: t
;
1878 continue; /* leaf vdevs only */
1879 if (t
== DTL_PARTIAL
)
1880 minref
= 1; /* i.e. non-zero */
1881 else if (vd
->vdev_nparity
!= 0)
1882 minref
= vd
->vdev_nparity
+ 1; /* RAID-Z */
1884 minref
= vd
->vdev_children
; /* any kind of mirror */
1885 space_reftree_create(&reftree
);
1886 for (c
= 0; c
< vd
->vdev_children
; c
++) {
1887 vdev_t
*cvd
= vd
->vdev_child
[c
];
1888 mutex_enter(&cvd
->vdev_dtl_lock
);
1889 space_reftree_add_map(&reftree
, cvd
->vdev_dtl
[s
], 1);
1890 mutex_exit(&cvd
->vdev_dtl_lock
);
1892 space_reftree_generate_map(&reftree
, vd
->vdev_dtl
[t
], minref
);
1893 space_reftree_destroy(&reftree
);
1895 mutex_exit(&vd
->vdev_dtl_lock
);
1899 vdev_dtl_load(vdev_t
*vd
)
1901 spa_t
*spa
= vd
->vdev_spa
;
1902 objset_t
*mos
= spa
->spa_meta_objset
;
1906 if (vd
->vdev_ops
->vdev_op_leaf
&& vd
->vdev_dtl_object
!= 0) {
1907 ASSERT(!vd
->vdev_ishole
);
1909 error
= space_map_open(&vd
->vdev_dtl_sm
, mos
,
1910 vd
->vdev_dtl_object
, 0, -1ULL, 0, &vd
->vdev_dtl_lock
);
1913 ASSERT(vd
->vdev_dtl_sm
!= NULL
);
1915 mutex_enter(&vd
->vdev_dtl_lock
);
1918 * Now that we've opened the space_map we need to update
1921 space_map_update(vd
->vdev_dtl_sm
);
1923 error
= space_map_load(vd
->vdev_dtl_sm
,
1924 vd
->vdev_dtl
[DTL_MISSING
], SM_ALLOC
);
1925 mutex_exit(&vd
->vdev_dtl_lock
);
1930 for (c
= 0; c
< vd
->vdev_children
; c
++) {
1931 error
= vdev_dtl_load(vd
->vdev_child
[c
]);
1940 vdev_dtl_sync(vdev_t
*vd
, uint64_t txg
)
1942 spa_t
*spa
= vd
->vdev_spa
;
1943 range_tree_t
*rt
= vd
->vdev_dtl
[DTL_MISSING
];
1944 objset_t
*mos
= spa
->spa_meta_objset
;
1945 range_tree_t
*rtsync
;
1948 uint64_t object
= space_map_object(vd
->vdev_dtl_sm
);
1950 ASSERT(!vd
->vdev_ishole
);
1951 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
1953 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
1955 if (vd
->vdev_detached
|| vd
->vdev_top
->vdev_removing
) {
1956 mutex_enter(&vd
->vdev_dtl_lock
);
1957 space_map_free(vd
->vdev_dtl_sm
, tx
);
1958 space_map_close(vd
->vdev_dtl_sm
);
1959 vd
->vdev_dtl_sm
= NULL
;
1960 mutex_exit(&vd
->vdev_dtl_lock
);
1965 if (vd
->vdev_dtl_sm
== NULL
) {
1966 uint64_t new_object
;
1968 new_object
= space_map_alloc(mos
, tx
);
1969 VERIFY3U(new_object
, !=, 0);
1971 VERIFY0(space_map_open(&vd
->vdev_dtl_sm
, mos
, new_object
,
1972 0, -1ULL, 0, &vd
->vdev_dtl_lock
));
1973 ASSERT(vd
->vdev_dtl_sm
!= NULL
);
1976 mutex_init(&rtlock
, NULL
, MUTEX_DEFAULT
, NULL
);
1978 rtsync
= range_tree_create(NULL
, NULL
, &rtlock
);
1980 mutex_enter(&rtlock
);
1982 mutex_enter(&vd
->vdev_dtl_lock
);
1983 range_tree_walk(rt
, range_tree_add
, rtsync
);
1984 mutex_exit(&vd
->vdev_dtl_lock
);
1986 space_map_truncate(vd
->vdev_dtl_sm
, tx
);
1987 space_map_write(vd
->vdev_dtl_sm
, rtsync
, SM_ALLOC
, tx
);
1988 range_tree_vacate(rtsync
, NULL
, NULL
);
1990 range_tree_destroy(rtsync
);
1992 mutex_exit(&rtlock
);
1993 mutex_destroy(&rtlock
);
1996 * If the object for the space map has changed then dirty
1997 * the top level so that we update the config.
1999 if (object
!= space_map_object(vd
->vdev_dtl_sm
)) {
2000 zfs_dbgmsg("txg %llu, spa %s, DTL old object %llu, "
2001 "new object %llu", txg
, spa_name(spa
), object
,
2002 space_map_object(vd
->vdev_dtl_sm
));
2003 vdev_config_dirty(vd
->vdev_top
);
2008 mutex_enter(&vd
->vdev_dtl_lock
);
2009 space_map_update(vd
->vdev_dtl_sm
);
2010 mutex_exit(&vd
->vdev_dtl_lock
);
2014 * Determine whether the specified vdev can be offlined/detached/removed
2015 * without losing data.
2018 vdev_dtl_required(vdev_t
*vd
)
2020 spa_t
*spa
= vd
->vdev_spa
;
2021 vdev_t
*tvd
= vd
->vdev_top
;
2022 uint8_t cant_read
= vd
->vdev_cant_read
;
2025 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
2027 if (vd
== spa
->spa_root_vdev
|| vd
== tvd
)
2031 * Temporarily mark the device as unreadable, and then determine
2032 * whether this results in any DTL outages in the top-level vdev.
2033 * If not, we can safely offline/detach/remove the device.
2035 vd
->vdev_cant_read
= B_TRUE
;
2036 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
2037 required
= !vdev_dtl_empty(tvd
, DTL_OUTAGE
);
2038 vd
->vdev_cant_read
= cant_read
;
2039 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
2041 if (!required
&& zio_injection_enabled
)
2042 required
= !!zio_handle_device_injection(vd
, NULL
, ECHILD
);
2048 * Determine if resilver is needed, and if so the txg range.
2051 vdev_resilver_needed(vdev_t
*vd
, uint64_t *minp
, uint64_t *maxp
)
2053 boolean_t needed
= B_FALSE
;
2054 uint64_t thismin
= UINT64_MAX
;
2055 uint64_t thismax
= 0;
2058 if (vd
->vdev_children
== 0) {
2059 mutex_enter(&vd
->vdev_dtl_lock
);
2060 if (range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]) != 0 &&
2061 vdev_writeable(vd
)) {
2063 thismin
= vdev_dtl_min(vd
);
2064 thismax
= vdev_dtl_max(vd
);
2067 mutex_exit(&vd
->vdev_dtl_lock
);
2069 for (c
= 0; c
< vd
->vdev_children
; c
++) {
2070 vdev_t
*cvd
= vd
->vdev_child
[c
];
2071 uint64_t cmin
, cmax
;
2073 if (vdev_resilver_needed(cvd
, &cmin
, &cmax
)) {
2074 thismin
= MIN(thismin
, cmin
);
2075 thismax
= MAX(thismax
, cmax
);
2081 if (needed
&& minp
) {
2089 vdev_load(vdev_t
*vd
)
2094 * Recursively load all children.
2096 for (c
= 0; c
< vd
->vdev_children
; c
++)
2097 vdev_load(vd
->vdev_child
[c
]);
2100 * If this is a top-level vdev, initialize its metaslabs.
2102 if (vd
== vd
->vdev_top
&& !vd
->vdev_ishole
&&
2103 (vd
->vdev_ashift
== 0 || vd
->vdev_asize
== 0 ||
2104 vdev_metaslab_init(vd
, 0) != 0))
2105 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2106 VDEV_AUX_CORRUPT_DATA
);
2109 * If this is a leaf vdev, load its DTL.
2111 if (vd
->vdev_ops
->vdev_op_leaf
&& vdev_dtl_load(vd
) != 0)
2112 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2113 VDEV_AUX_CORRUPT_DATA
);
2117 * The special vdev case is used for hot spares and l2cache devices. Its
2118 * sole purpose it to set the vdev state for the associated vdev. To do this,
2119 * we make sure that we can open the underlying device, then try to read the
2120 * label, and make sure that the label is sane and that it hasn't been
2121 * repurposed to another pool.
2124 vdev_validate_aux(vdev_t
*vd
)
2127 uint64_t guid
, version
;
2130 if (!vdev_readable(vd
))
2133 if ((label
= vdev_label_read_config(vd
, -1ULL)) == NULL
) {
2134 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
2135 VDEV_AUX_CORRUPT_DATA
);
2139 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_VERSION
, &version
) != 0 ||
2140 !SPA_VERSION_IS_SUPPORTED(version
) ||
2141 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
, &guid
) != 0 ||
2142 guid
!= vd
->vdev_guid
||
2143 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
, &state
) != 0) {
2144 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
2145 VDEV_AUX_CORRUPT_DATA
);
2151 * We don't actually check the pool state here. If it's in fact in
2152 * use by another pool, we update this fact on the fly when requested.
2159 vdev_remove(vdev_t
*vd
, uint64_t txg
)
2161 spa_t
*spa
= vd
->vdev_spa
;
2162 objset_t
*mos
= spa
->spa_meta_objset
;
2166 tx
= dmu_tx_create_assigned(spa_get_dsl(spa
), txg
);
2168 if (vd
->vdev_ms
!= NULL
) {
2169 metaslab_group_t
*mg
= vd
->vdev_mg
;
2171 metaslab_group_histogram_verify(mg
);
2172 metaslab_class_histogram_verify(mg
->mg_class
);
2174 for (m
= 0; m
< vd
->vdev_ms_count
; m
++) {
2175 metaslab_t
*msp
= vd
->vdev_ms
[m
];
2177 if (msp
== NULL
|| msp
->ms_sm
== NULL
)
2180 mutex_enter(&msp
->ms_lock
);
2182 * If the metaslab was not loaded when the vdev
2183 * was removed then the histogram accounting may
2184 * not be accurate. Update the histogram information
2185 * here so that we ensure that the metaslab group
2186 * and metaslab class are up-to-date.
2188 metaslab_group_histogram_remove(mg
, msp
);
2190 VERIFY0(space_map_allocated(msp
->ms_sm
));
2191 space_map_free(msp
->ms_sm
, tx
);
2192 space_map_close(msp
->ms_sm
);
2194 mutex_exit(&msp
->ms_lock
);
2197 metaslab_group_histogram_verify(mg
);
2198 metaslab_class_histogram_verify(mg
->mg_class
);
2199 for (i
= 0; i
< RANGE_TREE_HISTOGRAM_SIZE
; i
++)
2200 ASSERT0(mg
->mg_histogram
[i
]);
2204 if (vd
->vdev_ms_array
) {
2205 (void) dmu_object_free(mos
, vd
->vdev_ms_array
, tx
);
2206 vd
->vdev_ms_array
= 0;
2212 vdev_sync_done(vdev_t
*vd
, uint64_t txg
)
2215 boolean_t reassess
= !txg_list_empty(&vd
->vdev_ms_list
, TXG_CLEAN(txg
));
2217 ASSERT(!vd
->vdev_ishole
);
2219 while ((msp
= txg_list_remove(&vd
->vdev_ms_list
, TXG_CLEAN(txg
))))
2220 metaslab_sync_done(msp
, txg
);
2223 metaslab_sync_reassess(vd
->vdev_mg
);
2227 vdev_sync(vdev_t
*vd
, uint64_t txg
)
2229 spa_t
*spa
= vd
->vdev_spa
;
2234 ASSERT(!vd
->vdev_ishole
);
2236 if (vd
->vdev_ms_array
== 0 && vd
->vdev_ms_shift
!= 0) {
2237 ASSERT(vd
== vd
->vdev_top
);
2238 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
2239 vd
->vdev_ms_array
= dmu_object_alloc(spa
->spa_meta_objset
,
2240 DMU_OT_OBJECT_ARRAY
, 0, DMU_OT_NONE
, 0, tx
);
2241 ASSERT(vd
->vdev_ms_array
!= 0);
2242 vdev_config_dirty(vd
);
2247 * Remove the metadata associated with this vdev once it's empty.
2249 if (vd
->vdev_stat
.vs_alloc
== 0 && vd
->vdev_removing
)
2250 vdev_remove(vd
, txg
);
2252 while ((msp
= txg_list_remove(&vd
->vdev_ms_list
, txg
)) != NULL
) {
2253 metaslab_sync(msp
, txg
);
2254 (void) txg_list_add(&vd
->vdev_ms_list
, msp
, TXG_CLEAN(txg
));
2257 while ((lvd
= txg_list_remove(&vd
->vdev_dtl_list
, txg
)) != NULL
)
2258 vdev_dtl_sync(lvd
, txg
);
2260 (void) txg_list_add(&spa
->spa_vdev_txg_list
, vd
, TXG_CLEAN(txg
));
2264 vdev_psize_to_asize(vdev_t
*vd
, uint64_t psize
)
2266 return (vd
->vdev_ops
->vdev_op_asize(vd
, psize
));
2270 * Mark the given vdev faulted. A faulted vdev behaves as if the device could
2271 * not be opened, and no I/O is attempted.
2274 vdev_fault(spa_t
*spa
, uint64_t guid
, vdev_aux_t aux
)
2278 spa_vdev_state_enter(spa
, SCL_NONE
);
2280 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2281 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2283 if (!vd
->vdev_ops
->vdev_op_leaf
)
2284 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2289 * We don't directly use the aux state here, but if we do a
2290 * vdev_reopen(), we need this value to be present to remember why we
2293 vd
->vdev_label_aux
= aux
;
2296 * Faulted state takes precedence over degraded.
2298 vd
->vdev_delayed_close
= B_FALSE
;
2299 vd
->vdev_faulted
= 1ULL;
2300 vd
->vdev_degraded
= 0ULL;
2301 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_FAULTED
, aux
);
2304 * If this device has the only valid copy of the data, then
2305 * back off and simply mark the vdev as degraded instead.
2307 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&& vdev_dtl_required(vd
)) {
2308 vd
->vdev_degraded
= 1ULL;
2309 vd
->vdev_faulted
= 0ULL;
2312 * If we reopen the device and it's not dead, only then do we
2317 if (vdev_readable(vd
))
2318 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
, aux
);
2321 return (spa_vdev_state_exit(spa
, vd
, 0));
2325 * Mark the given vdev degraded. A degraded vdev is purely an indication to the
2326 * user that something is wrong. The vdev continues to operate as normal as far
2327 * as I/O is concerned.
2330 vdev_degrade(spa_t
*spa
, uint64_t guid
, vdev_aux_t aux
)
2334 spa_vdev_state_enter(spa
, SCL_NONE
);
2336 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2337 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2339 if (!vd
->vdev_ops
->vdev_op_leaf
)
2340 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2343 * If the vdev is already faulted, then don't do anything.
2345 if (vd
->vdev_faulted
|| vd
->vdev_degraded
)
2346 return (spa_vdev_state_exit(spa
, NULL
, 0));
2348 vd
->vdev_degraded
= 1ULL;
2349 if (!vdev_is_dead(vd
))
2350 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
,
2353 return (spa_vdev_state_exit(spa
, vd
, 0));
2357 * Online the given vdev.
2359 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached
2360 * spare device should be detached when the device finishes resilvering.
2361 * Second, the online should be treated like a 'test' online case, so no FMA
2362 * events are generated if the device fails to open.
2365 vdev_online(spa_t
*spa
, uint64_t guid
, uint64_t flags
, vdev_state_t
*newstate
)
2367 vdev_t
*vd
, *tvd
, *pvd
, *rvd
= spa
->spa_root_vdev
;
2369 spa_vdev_state_enter(spa
, SCL_NONE
);
2371 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2372 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2374 if (!vd
->vdev_ops
->vdev_op_leaf
)
2375 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2378 vd
->vdev_offline
= B_FALSE
;
2379 vd
->vdev_tmpoffline
= B_FALSE
;
2380 vd
->vdev_checkremove
= !!(flags
& ZFS_ONLINE_CHECKREMOVE
);
2381 vd
->vdev_forcefault
= !!(flags
& ZFS_ONLINE_FORCEFAULT
);
2383 /* XXX - L2ARC 1.0 does not support expansion */
2384 if (!vd
->vdev_aux
) {
2385 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2386 pvd
->vdev_expanding
= !!(flags
& ZFS_ONLINE_EXPAND
);
2390 vd
->vdev_checkremove
= vd
->vdev_forcefault
= B_FALSE
;
2392 if (!vd
->vdev_aux
) {
2393 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2394 pvd
->vdev_expanding
= B_FALSE
;
2398 *newstate
= vd
->vdev_state
;
2399 if ((flags
& ZFS_ONLINE_UNSPARE
) &&
2400 !vdev_is_dead(vd
) && vd
->vdev_parent
&&
2401 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
2402 vd
->vdev_parent
->vdev_child
[0] == vd
)
2403 vd
->vdev_unspare
= B_TRUE
;
2405 if ((flags
& ZFS_ONLINE_EXPAND
) || spa
->spa_autoexpand
) {
2407 /* XXX - L2ARC 1.0 does not support expansion */
2409 return (spa_vdev_state_exit(spa
, vd
, ENOTSUP
));
2410 spa_async_request(spa
, SPA_ASYNC_CONFIG_UPDATE
);
2412 return (spa_vdev_state_exit(spa
, vd
, 0));
2416 vdev_offline_locked(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
2420 uint64_t generation
;
2421 metaslab_group_t
*mg
;
2424 spa_vdev_state_enter(spa
, SCL_ALLOC
);
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
));
2434 generation
= spa
->spa_config_generation
+ 1;
2437 * If the device isn't already offline, try to offline it.
2439 if (!vd
->vdev_offline
) {
2441 * If this device has the only valid copy of some data,
2442 * don't allow it to be offlined. Log devices are always
2445 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&&
2446 vdev_dtl_required(vd
))
2447 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
2450 * If the top-level is a slog and it has had allocations
2451 * then proceed. We check that the vdev's metaslab group
2452 * is not NULL since it's possible that we may have just
2453 * added this vdev but not yet initialized its metaslabs.
2455 if (tvd
->vdev_islog
&& mg
!= NULL
) {
2457 * Prevent any future allocations.
2459 metaslab_group_passivate(mg
);
2460 (void) spa_vdev_state_exit(spa
, vd
, 0);
2462 error
= spa_offline_log(spa
);
2464 spa_vdev_state_enter(spa
, SCL_ALLOC
);
2467 * Check to see if the config has changed.
2469 if (error
|| generation
!= spa
->spa_config_generation
) {
2470 metaslab_group_activate(mg
);
2472 return (spa_vdev_state_exit(spa
,
2474 (void) spa_vdev_state_exit(spa
, vd
, 0);
2477 ASSERT0(tvd
->vdev_stat
.vs_alloc
);
2481 * Offline this device and reopen its top-level vdev.
2482 * If the top-level vdev is a log device then just offline
2483 * it. Otherwise, if this action results in the top-level
2484 * vdev becoming unusable, undo it and fail the request.
2486 vd
->vdev_offline
= B_TRUE
;
2489 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&&
2490 vdev_is_dead(tvd
)) {
2491 vd
->vdev_offline
= B_FALSE
;
2493 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
2497 * Add the device back into the metaslab rotor so that
2498 * once we online the device it's open for business.
2500 if (tvd
->vdev_islog
&& mg
!= NULL
)
2501 metaslab_group_activate(mg
);
2504 vd
->vdev_tmpoffline
= !!(flags
& ZFS_OFFLINE_TEMPORARY
);
2506 return (spa_vdev_state_exit(spa
, vd
, 0));
2510 vdev_offline(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
2514 mutex_enter(&spa
->spa_vdev_top_lock
);
2515 error
= vdev_offline_locked(spa
, guid
, flags
);
2516 mutex_exit(&spa
->spa_vdev_top_lock
);
2522 * Clear the error counts associated with this vdev. Unlike vdev_online() and
2523 * vdev_offline(), we assume the spa config is locked. We also clear all
2524 * children. If 'vd' is NULL, then the user wants to clear all vdevs.
2527 vdev_clear(spa_t
*spa
, vdev_t
*vd
)
2529 vdev_t
*rvd
= spa
->spa_root_vdev
;
2532 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
2537 vd
->vdev_stat
.vs_read_errors
= 0;
2538 vd
->vdev_stat
.vs_write_errors
= 0;
2539 vd
->vdev_stat
.vs_checksum_errors
= 0;
2541 for (c
= 0; c
< vd
->vdev_children
; c
++)
2542 vdev_clear(spa
, vd
->vdev_child
[c
]);
2545 * If we're in the FAULTED state or have experienced failed I/O, then
2546 * clear the persistent state and attempt to reopen the device. We
2547 * also mark the vdev config dirty, so that the new faulted state is
2548 * written out to disk.
2550 if (vd
->vdev_faulted
|| vd
->vdev_degraded
||
2551 !vdev_readable(vd
) || !vdev_writeable(vd
)) {
2554 * When reopening in reponse to a clear event, it may be due to
2555 * a fmadm repair request. In this case, if the device is
2556 * still broken, we want to still post the ereport again.
2558 vd
->vdev_forcefault
= B_TRUE
;
2560 vd
->vdev_faulted
= vd
->vdev_degraded
= 0ULL;
2561 vd
->vdev_cant_read
= B_FALSE
;
2562 vd
->vdev_cant_write
= B_FALSE
;
2564 vdev_reopen(vd
== rvd
? rvd
: vd
->vdev_top
);
2566 vd
->vdev_forcefault
= B_FALSE
;
2568 if (vd
!= rvd
&& vdev_writeable(vd
->vdev_top
))
2569 vdev_state_dirty(vd
->vdev_top
);
2571 if (vd
->vdev_aux
== NULL
&& !vdev_is_dead(vd
))
2572 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
2574 spa_event_notify(spa
, vd
, FM_EREPORT_ZFS_DEVICE_CLEAR
);
2578 * When clearing a FMA-diagnosed fault, we always want to
2579 * unspare the device, as we assume that the original spare was
2580 * done in response to the FMA fault.
2582 if (!vdev_is_dead(vd
) && vd
->vdev_parent
!= NULL
&&
2583 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
2584 vd
->vdev_parent
->vdev_child
[0] == vd
)
2585 vd
->vdev_unspare
= B_TRUE
;
2589 vdev_is_dead(vdev_t
*vd
)
2592 * Holes and missing devices are always considered "dead".
2593 * This simplifies the code since we don't have to check for
2594 * these types of devices in the various code paths.
2595 * Instead we rely on the fact that we skip over dead devices
2596 * before issuing I/O to them.
2598 return (vd
->vdev_state
< VDEV_STATE_DEGRADED
|| vd
->vdev_ishole
||
2599 vd
->vdev_ops
== &vdev_missing_ops
);
2603 vdev_readable(vdev_t
*vd
)
2605 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_read
);
2609 vdev_writeable(vdev_t
*vd
)
2611 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_write
);
2615 vdev_allocatable(vdev_t
*vd
)
2617 uint64_t state
= vd
->vdev_state
;
2620 * We currently allow allocations from vdevs which may be in the
2621 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
2622 * fails to reopen then we'll catch it later when we're holding
2623 * the proper locks. Note that we have to get the vdev state
2624 * in a local variable because although it changes atomically,
2625 * we're asking two separate questions about it.
2627 return (!(state
< VDEV_STATE_DEGRADED
&& state
!= VDEV_STATE_CLOSED
) &&
2628 !vd
->vdev_cant_write
&& !vd
->vdev_ishole
);
2632 vdev_accessible(vdev_t
*vd
, zio_t
*zio
)
2634 ASSERT(zio
->io_vd
== vd
);
2636 if (vdev_is_dead(vd
) || vd
->vdev_remove_wanted
)
2639 if (zio
->io_type
== ZIO_TYPE_READ
)
2640 return (!vd
->vdev_cant_read
);
2642 if (zio
->io_type
== ZIO_TYPE_WRITE
)
2643 return (!vd
->vdev_cant_write
);
2649 * Get statistics for the given vdev.
2652 vdev_get_stats(vdev_t
*vd
, vdev_stat_t
*vs
)
2654 spa_t
*spa
= vd
->vdev_spa
;
2655 vdev_t
*rvd
= spa
->spa_root_vdev
;
2658 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
2660 mutex_enter(&vd
->vdev_stat_lock
);
2661 bcopy(&vd
->vdev_stat
, vs
, sizeof (*vs
));
2662 vs
->vs_timestamp
= gethrtime() - vs
->vs_timestamp
;
2663 vs
->vs_state
= vd
->vdev_state
;
2664 vs
->vs_rsize
= vdev_get_min_asize(vd
);
2665 if (vd
->vdev_ops
->vdev_op_leaf
)
2666 vs
->vs_rsize
+= VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
;
2667 vs
->vs_esize
= vd
->vdev_max_asize
- vd
->vdev_asize
;
2668 if (vd
->vdev_aux
== NULL
&& vd
== vd
->vdev_top
&& !vd
->vdev_ishole
) {
2669 vs
->vs_fragmentation
= vd
->vdev_mg
->mg_fragmentation
;
2673 * If we're getting stats on the root vdev, aggregate the I/O counts
2674 * over all top-level vdevs (i.e. the direct children of the root).
2677 for (c
= 0; c
< rvd
->vdev_children
; c
++) {
2678 vdev_t
*cvd
= rvd
->vdev_child
[c
];
2679 vdev_stat_t
*cvs
= &cvd
->vdev_stat
;
2681 for (t
= 0; t
< ZIO_TYPES
; t
++) {
2682 vs
->vs_ops
[t
] += cvs
->vs_ops
[t
];
2683 vs
->vs_bytes
[t
] += cvs
->vs_bytes
[t
];
2685 cvs
->vs_scan_removing
= cvd
->vdev_removing
;
2688 mutex_exit(&vd
->vdev_stat_lock
);
2692 vdev_clear_stats(vdev_t
*vd
)
2694 mutex_enter(&vd
->vdev_stat_lock
);
2695 vd
->vdev_stat
.vs_space
= 0;
2696 vd
->vdev_stat
.vs_dspace
= 0;
2697 vd
->vdev_stat
.vs_alloc
= 0;
2698 mutex_exit(&vd
->vdev_stat_lock
);
2702 vdev_scan_stat_init(vdev_t
*vd
)
2704 vdev_stat_t
*vs
= &vd
->vdev_stat
;
2707 for (c
= 0; c
< vd
->vdev_children
; c
++)
2708 vdev_scan_stat_init(vd
->vdev_child
[c
]);
2710 mutex_enter(&vd
->vdev_stat_lock
);
2711 vs
->vs_scan_processed
= 0;
2712 mutex_exit(&vd
->vdev_stat_lock
);
2716 vdev_stat_update(zio_t
*zio
, uint64_t psize
)
2718 spa_t
*spa
= zio
->io_spa
;
2719 vdev_t
*rvd
= spa
->spa_root_vdev
;
2720 vdev_t
*vd
= zio
->io_vd
? zio
->io_vd
: rvd
;
2722 uint64_t txg
= zio
->io_txg
;
2723 vdev_stat_t
*vs
= &vd
->vdev_stat
;
2724 zio_type_t type
= zio
->io_type
;
2725 int flags
= zio
->io_flags
;
2728 * If this i/o is a gang leader, it didn't do any actual work.
2730 if (zio
->io_gang_tree
)
2733 if (zio
->io_error
== 0) {
2735 * If this is a root i/o, don't count it -- we've already
2736 * counted the top-level vdevs, and vdev_get_stats() will
2737 * aggregate them when asked. This reduces contention on
2738 * the root vdev_stat_lock and implicitly handles blocks
2739 * that compress away to holes, for which there is no i/o.
2740 * (Holes never create vdev children, so all the counters
2741 * remain zero, which is what we want.)
2743 * Note: this only applies to successful i/o (io_error == 0)
2744 * because unlike i/o counts, errors are not additive.
2745 * When reading a ditto block, for example, failure of
2746 * one top-level vdev does not imply a root-level error.
2751 ASSERT(vd
== zio
->io_vd
);
2753 if (flags
& ZIO_FLAG_IO_BYPASS
)
2756 mutex_enter(&vd
->vdev_stat_lock
);
2758 if (flags
& ZIO_FLAG_IO_REPAIR
) {
2759 if (flags
& ZIO_FLAG_SCAN_THREAD
) {
2760 dsl_scan_phys_t
*scn_phys
=
2761 &spa
->spa_dsl_pool
->dp_scan
->scn_phys
;
2762 uint64_t *processed
= &scn_phys
->scn_processed
;
2765 if (vd
->vdev_ops
->vdev_op_leaf
)
2766 atomic_add_64(processed
, psize
);
2767 vs
->vs_scan_processed
+= psize
;
2770 if (flags
& ZIO_FLAG_SELF_HEAL
)
2771 vs
->vs_self_healed
+= psize
;
2775 vs
->vs_bytes
[type
] += psize
;
2777 mutex_exit(&vd
->vdev_stat_lock
);
2781 if (flags
& ZIO_FLAG_SPECULATIVE
)
2785 * If this is an I/O error that is going to be retried, then ignore the
2786 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as
2787 * hard errors, when in reality they can happen for any number of
2788 * innocuous reasons (bus resets, MPxIO link failure, etc).
2790 if (zio
->io_error
== EIO
&&
2791 !(zio
->io_flags
& ZIO_FLAG_IO_RETRY
))
2795 * Intent logs writes won't propagate their error to the root
2796 * I/O so don't mark these types of failures as pool-level
2799 if (zio
->io_vd
== NULL
&& (zio
->io_flags
& ZIO_FLAG_DONT_PROPAGATE
))
2802 mutex_enter(&vd
->vdev_stat_lock
);
2803 if (type
== ZIO_TYPE_READ
&& !vdev_is_dead(vd
)) {
2804 if (zio
->io_error
== ECKSUM
)
2805 vs
->vs_checksum_errors
++;
2807 vs
->vs_read_errors
++;
2809 if (type
== ZIO_TYPE_WRITE
&& !vdev_is_dead(vd
))
2810 vs
->vs_write_errors
++;
2811 mutex_exit(&vd
->vdev_stat_lock
);
2813 if (type
== ZIO_TYPE_WRITE
&& txg
!= 0 &&
2814 (!(flags
& ZIO_FLAG_IO_REPAIR
) ||
2815 (flags
& ZIO_FLAG_SCAN_THREAD
) ||
2816 spa
->spa_claiming
)) {
2818 * This is either a normal write (not a repair), or it's
2819 * a repair induced by the scrub thread, or it's a repair
2820 * made by zil_claim() during spa_load() in the first txg.
2821 * In the normal case, we commit the DTL change in the same
2822 * txg as the block was born. In the scrub-induced repair
2823 * case, we know that scrubs run in first-pass syncing context,
2824 * so we commit the DTL change in spa_syncing_txg(spa).
2825 * In the zil_claim() case, we commit in spa_first_txg(spa).
2827 * We currently do not make DTL entries for failed spontaneous
2828 * self-healing writes triggered by normal (non-scrubbing)
2829 * reads, because we have no transactional context in which to
2830 * do so -- and it's not clear that it'd be desirable anyway.
2832 if (vd
->vdev_ops
->vdev_op_leaf
) {
2833 uint64_t commit_txg
= txg
;
2834 if (flags
& ZIO_FLAG_SCAN_THREAD
) {
2835 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
2836 ASSERT(spa_sync_pass(spa
) == 1);
2837 vdev_dtl_dirty(vd
, DTL_SCRUB
, txg
, 1);
2838 commit_txg
= spa_syncing_txg(spa
);
2839 } else if (spa
->spa_claiming
) {
2840 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
2841 commit_txg
= spa_first_txg(spa
);
2843 ASSERT(commit_txg
>= spa_syncing_txg(spa
));
2844 if (vdev_dtl_contains(vd
, DTL_MISSING
, txg
, 1))
2846 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2847 vdev_dtl_dirty(pvd
, DTL_PARTIAL
, txg
, 1);
2848 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, commit_txg
);
2851 vdev_dtl_dirty(vd
, DTL_MISSING
, txg
, 1);
2856 * Update the in-core space usage stats for this vdev, its metaslab class,
2857 * and the root vdev.
2860 vdev_space_update(vdev_t
*vd
, int64_t alloc_delta
, int64_t defer_delta
,
2861 int64_t space_delta
)
2863 int64_t dspace_delta
= space_delta
;
2864 spa_t
*spa
= vd
->vdev_spa
;
2865 vdev_t
*rvd
= spa
->spa_root_vdev
;
2866 metaslab_group_t
*mg
= vd
->vdev_mg
;
2867 metaslab_class_t
*mc
= mg
? mg
->mg_class
: NULL
;
2869 ASSERT(vd
== vd
->vdev_top
);
2872 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
2873 * factor. We must calculate this here and not at the root vdev
2874 * because the root vdev's psize-to-asize is simply the max of its
2875 * childrens', thus not accurate enough for us.
2877 ASSERT((dspace_delta
& (SPA_MINBLOCKSIZE
-1)) == 0);
2878 ASSERT(vd
->vdev_deflate_ratio
!= 0 || vd
->vdev_isl2cache
);
2879 dspace_delta
= (dspace_delta
>> SPA_MINBLOCKSHIFT
) *
2880 vd
->vdev_deflate_ratio
;
2882 mutex_enter(&vd
->vdev_stat_lock
);
2883 vd
->vdev_stat
.vs_alloc
+= alloc_delta
;
2884 vd
->vdev_stat
.vs_space
+= space_delta
;
2885 vd
->vdev_stat
.vs_dspace
+= dspace_delta
;
2886 mutex_exit(&vd
->vdev_stat_lock
);
2888 if (mc
== spa_normal_class(spa
)) {
2889 mutex_enter(&rvd
->vdev_stat_lock
);
2890 rvd
->vdev_stat
.vs_alloc
+= alloc_delta
;
2891 rvd
->vdev_stat
.vs_space
+= space_delta
;
2892 rvd
->vdev_stat
.vs_dspace
+= dspace_delta
;
2893 mutex_exit(&rvd
->vdev_stat_lock
);
2897 ASSERT(rvd
== vd
->vdev_parent
);
2898 ASSERT(vd
->vdev_ms_count
!= 0);
2900 metaslab_class_space_update(mc
,
2901 alloc_delta
, defer_delta
, space_delta
, dspace_delta
);
2906 * Mark a top-level vdev's config as dirty, placing it on the dirty list
2907 * so that it will be written out next time the vdev configuration is synced.
2908 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
2911 vdev_config_dirty(vdev_t
*vd
)
2913 spa_t
*spa
= vd
->vdev_spa
;
2914 vdev_t
*rvd
= spa
->spa_root_vdev
;
2917 ASSERT(spa_writeable(spa
));
2920 * If this is an aux vdev (as with l2cache and spare devices), then we
2921 * update the vdev config manually and set the sync flag.
2923 if (vd
->vdev_aux
!= NULL
) {
2924 spa_aux_vdev_t
*sav
= vd
->vdev_aux
;
2928 for (c
= 0; c
< sav
->sav_count
; c
++) {
2929 if (sav
->sav_vdevs
[c
] == vd
)
2933 if (c
== sav
->sav_count
) {
2935 * We're being removed. There's nothing more to do.
2937 ASSERT(sav
->sav_sync
== B_TRUE
);
2941 sav
->sav_sync
= B_TRUE
;
2943 if (nvlist_lookup_nvlist_array(sav
->sav_config
,
2944 ZPOOL_CONFIG_L2CACHE
, &aux
, &naux
) != 0) {
2945 VERIFY(nvlist_lookup_nvlist_array(sav
->sav_config
,
2946 ZPOOL_CONFIG_SPARES
, &aux
, &naux
) == 0);
2952 * Setting the nvlist in the middle if the array is a little
2953 * sketchy, but it will work.
2955 nvlist_free(aux
[c
]);
2956 aux
[c
] = vdev_config_generate(spa
, vd
, B_TRUE
, 0);
2962 * The dirty list is protected by the SCL_CONFIG lock. The caller
2963 * must either hold SCL_CONFIG as writer, or must be the sync thread
2964 * (which holds SCL_CONFIG as reader). There's only one sync thread,
2965 * so this is sufficient to ensure mutual exclusion.
2967 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
2968 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2969 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
2972 for (c
= 0; c
< rvd
->vdev_children
; c
++)
2973 vdev_config_dirty(rvd
->vdev_child
[c
]);
2975 ASSERT(vd
== vd
->vdev_top
);
2977 if (!list_link_active(&vd
->vdev_config_dirty_node
) &&
2979 list_insert_head(&spa
->spa_config_dirty_list
, vd
);
2984 vdev_config_clean(vdev_t
*vd
)
2986 spa_t
*spa
= vd
->vdev_spa
;
2988 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
2989 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2990 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
2992 ASSERT(list_link_active(&vd
->vdev_config_dirty_node
));
2993 list_remove(&spa
->spa_config_dirty_list
, vd
);
2997 * Mark a top-level vdev's state as dirty, so that the next pass of
2998 * spa_sync() can convert this into vdev_config_dirty(). We distinguish
2999 * the state changes from larger config changes because they require
3000 * much less locking, and are often needed for administrative actions.
3003 vdev_state_dirty(vdev_t
*vd
)
3005 spa_t
*spa
= vd
->vdev_spa
;
3007 ASSERT(spa_writeable(spa
));
3008 ASSERT(vd
== vd
->vdev_top
);
3011 * The state list is protected by the SCL_STATE lock. The caller
3012 * must either hold SCL_STATE as writer, or must be the sync thread
3013 * (which holds SCL_STATE as reader). There's only one sync thread,
3014 * so this is sufficient to ensure mutual exclusion.
3016 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
3017 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
3018 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
3020 if (!list_link_active(&vd
->vdev_state_dirty_node
) && !vd
->vdev_ishole
)
3021 list_insert_head(&spa
->spa_state_dirty_list
, vd
);
3025 vdev_state_clean(vdev_t
*vd
)
3027 spa_t
*spa
= vd
->vdev_spa
;
3029 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
3030 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
3031 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
3033 ASSERT(list_link_active(&vd
->vdev_state_dirty_node
));
3034 list_remove(&spa
->spa_state_dirty_list
, vd
);
3038 * Propagate vdev state up from children to parent.
3041 vdev_propagate_state(vdev_t
*vd
)
3043 spa_t
*spa
= vd
->vdev_spa
;
3044 vdev_t
*rvd
= spa
->spa_root_vdev
;
3045 int degraded
= 0, faulted
= 0;
3050 if (vd
->vdev_children
> 0) {
3051 for (c
= 0; c
< vd
->vdev_children
; c
++) {
3052 child
= vd
->vdev_child
[c
];
3055 * Don't factor holes into the decision.
3057 if (child
->vdev_ishole
)
3060 if (!vdev_readable(child
) ||
3061 (!vdev_writeable(child
) && spa_writeable(spa
))) {
3063 * Root special: if there is a top-level log
3064 * device, treat the root vdev as if it were
3067 if (child
->vdev_islog
&& vd
== rvd
)
3071 } else if (child
->vdev_state
<= VDEV_STATE_DEGRADED
) {
3075 if (child
->vdev_stat
.vs_aux
== VDEV_AUX_CORRUPT_DATA
)
3079 vd
->vdev_ops
->vdev_op_state_change(vd
, faulted
, degraded
);
3082 * Root special: if there is a top-level vdev that cannot be
3083 * opened due to corrupted metadata, then propagate the root
3084 * vdev's aux state as 'corrupt' rather than 'insufficient
3087 if (corrupted
&& vd
== rvd
&&
3088 rvd
->vdev_state
== VDEV_STATE_CANT_OPEN
)
3089 vdev_set_state(rvd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
3090 VDEV_AUX_CORRUPT_DATA
);
3093 if (vd
->vdev_parent
)
3094 vdev_propagate_state(vd
->vdev_parent
);
3098 * Set a vdev's state. If this is during an open, we don't update the parent
3099 * state, because we're in the process of opening children depth-first.
3100 * Otherwise, we propagate the change to the parent.
3102 * If this routine places a device in a faulted state, an appropriate ereport is
3106 vdev_set_state(vdev_t
*vd
, boolean_t isopen
, vdev_state_t state
, vdev_aux_t aux
)
3108 uint64_t save_state
;
3109 spa_t
*spa
= vd
->vdev_spa
;
3111 if (state
== vd
->vdev_state
) {
3112 vd
->vdev_stat
.vs_aux
= aux
;
3116 save_state
= vd
->vdev_state
;
3118 vd
->vdev_state
= state
;
3119 vd
->vdev_stat
.vs_aux
= aux
;
3122 * If we are setting the vdev state to anything but an open state, then
3123 * always close the underlying device unless the device has requested
3124 * a delayed close (i.e. we're about to remove or fault the device).
3125 * Otherwise, we keep accessible but invalid devices open forever.
3126 * We don't call vdev_close() itself, because that implies some extra
3127 * checks (offline, etc) that we don't want here. This is limited to
3128 * leaf devices, because otherwise closing the device will affect other
3131 if (!vd
->vdev_delayed_close
&& vdev_is_dead(vd
) &&
3132 vd
->vdev_ops
->vdev_op_leaf
)
3133 vd
->vdev_ops
->vdev_op_close(vd
);
3136 * If we have brought this vdev back into service, we need
3137 * to notify fmd so that it can gracefully repair any outstanding
3138 * cases due to a missing device. We do this in all cases, even those
3139 * that probably don't correlate to a repaired fault. This is sure to
3140 * catch all cases, and we let the zfs-retire agent sort it out. If
3141 * this is a transient state it's OK, as the retire agent will
3142 * double-check the state of the vdev before repairing it.
3144 if (state
== VDEV_STATE_HEALTHY
&& vd
->vdev_ops
->vdev_op_leaf
&&
3145 vd
->vdev_prevstate
!= state
)
3146 zfs_post_state_change(spa
, vd
);
3148 if (vd
->vdev_removed
&&
3149 state
== VDEV_STATE_CANT_OPEN
&&
3150 (aux
== VDEV_AUX_OPEN_FAILED
|| vd
->vdev_checkremove
)) {
3152 * If the previous state is set to VDEV_STATE_REMOVED, then this
3153 * device was previously marked removed and someone attempted to
3154 * reopen it. If this failed due to a nonexistent device, then
3155 * keep the device in the REMOVED state. We also let this be if
3156 * it is one of our special test online cases, which is only
3157 * attempting to online the device and shouldn't generate an FMA
3160 vd
->vdev_state
= VDEV_STATE_REMOVED
;
3161 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
3162 } else if (state
== VDEV_STATE_REMOVED
) {
3163 vd
->vdev_removed
= B_TRUE
;
3164 } else if (state
== VDEV_STATE_CANT_OPEN
) {
3166 * If we fail to open a vdev during an import or recovery, we
3167 * mark it as "not available", which signifies that it was
3168 * never there to begin with. Failure to open such a device
3169 * is not considered an error.
3171 if ((spa_load_state(spa
) == SPA_LOAD_IMPORT
||
3172 spa_load_state(spa
) == SPA_LOAD_RECOVER
) &&
3173 vd
->vdev_ops
->vdev_op_leaf
)
3174 vd
->vdev_not_present
= 1;
3177 * Post the appropriate ereport. If the 'prevstate' field is
3178 * set to something other than VDEV_STATE_UNKNOWN, it indicates
3179 * that this is part of a vdev_reopen(). In this case, we don't
3180 * want to post the ereport if the device was already in the
3181 * CANT_OPEN state beforehand.
3183 * If the 'checkremove' flag is set, then this is an attempt to
3184 * online the device in response to an insertion event. If we
3185 * hit this case, then we have detected an insertion event for a
3186 * faulted or offline device that wasn't in the removed state.
3187 * In this scenario, we don't post an ereport because we are
3188 * about to replace the device, or attempt an online with
3189 * vdev_forcefault, which will generate the fault for us.
3191 if ((vd
->vdev_prevstate
!= state
|| vd
->vdev_forcefault
) &&
3192 !vd
->vdev_not_present
&& !vd
->vdev_checkremove
&&
3193 vd
!= spa
->spa_root_vdev
) {
3197 case VDEV_AUX_OPEN_FAILED
:
3198 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED
;
3200 case VDEV_AUX_CORRUPT_DATA
:
3201 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA
;
3203 case VDEV_AUX_NO_REPLICAS
:
3204 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS
;
3206 case VDEV_AUX_BAD_GUID_SUM
:
3207 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM
;
3209 case VDEV_AUX_TOO_SMALL
:
3210 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL
;
3212 case VDEV_AUX_BAD_LABEL
:
3213 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL
;
3216 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN
;
3219 zfs_ereport_post(class, spa
, vd
, NULL
, save_state
, 0);
3222 /* Erase any notion of persistent removed state */
3223 vd
->vdev_removed
= B_FALSE
;
3225 vd
->vdev_removed
= B_FALSE
;
3228 if (!isopen
&& vd
->vdev_parent
)
3229 vdev_propagate_state(vd
->vdev_parent
);
3233 * Check the vdev configuration to ensure that it's capable of supporting
3237 vdev_is_bootable(vdev_t
*vd
)
3239 #if defined(__sun__) || defined(__sun)
3241 * Currently, we do not support RAID-Z or partial configuration.
3242 * In addition, only a single top-level vdev is allowed and none of the
3243 * leaves can be wholedisks.
3247 if (!vd
->vdev_ops
->vdev_op_leaf
) {
3248 char *vdev_type
= vd
->vdev_ops
->vdev_op_type
;
3250 if (strcmp(vdev_type
, VDEV_TYPE_ROOT
) == 0 &&
3251 vd
->vdev_children
> 1) {
3253 } else if (strcmp(vdev_type
, VDEV_TYPE_RAIDZ
) == 0 ||
3254 strcmp(vdev_type
, VDEV_TYPE_MISSING
) == 0) {
3257 } else if (vd
->vdev_wholedisk
== 1) {
3261 for (c
= 0; c
< vd
->vdev_children
; c
++) {
3262 if (!vdev_is_bootable(vd
->vdev_child
[c
]))
3265 #endif /* __sun__ || __sun */
3270 * Load the state from the original vdev tree (ovd) which
3271 * we've retrieved from the MOS config object. If the original
3272 * vdev was offline or faulted then we transfer that state to the
3273 * device in the current vdev tree (nvd).
3276 vdev_load_log_state(vdev_t
*nvd
, vdev_t
*ovd
)
3280 ASSERT(nvd
->vdev_top
->vdev_islog
);
3281 ASSERT(spa_config_held(nvd
->vdev_spa
,
3282 SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
3283 ASSERT3U(nvd
->vdev_guid
, ==, ovd
->vdev_guid
);
3285 for (c
= 0; c
< nvd
->vdev_children
; c
++)
3286 vdev_load_log_state(nvd
->vdev_child
[c
], ovd
->vdev_child
[c
]);
3288 if (nvd
->vdev_ops
->vdev_op_leaf
) {
3290 * Restore the persistent vdev state
3292 nvd
->vdev_offline
= ovd
->vdev_offline
;
3293 nvd
->vdev_faulted
= ovd
->vdev_faulted
;
3294 nvd
->vdev_degraded
= ovd
->vdev_degraded
;
3295 nvd
->vdev_removed
= ovd
->vdev_removed
;
3300 * Determine if a log device has valid content. If the vdev was
3301 * removed or faulted in the MOS config then we know that
3302 * the content on the log device has already been written to the pool.
3305 vdev_log_state_valid(vdev_t
*vd
)
3309 if (vd
->vdev_ops
->vdev_op_leaf
&& !vd
->vdev_faulted
&&
3313 for (c
= 0; c
< vd
->vdev_children
; c
++)
3314 if (vdev_log_state_valid(vd
->vdev_child
[c
]))
3321 * Expand a vdev if possible.
3324 vdev_expand(vdev_t
*vd
, uint64_t txg
)
3326 ASSERT(vd
->vdev_top
== vd
);
3327 ASSERT(spa_config_held(vd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
3329 if ((vd
->vdev_asize
>> vd
->vdev_ms_shift
) > vd
->vdev_ms_count
) {
3330 VERIFY(vdev_metaslab_init(vd
, txg
) == 0);
3331 vdev_config_dirty(vd
);
3339 vdev_split(vdev_t
*vd
)
3341 vdev_t
*cvd
, *pvd
= vd
->vdev_parent
;
3343 vdev_remove_child(pvd
, vd
);
3344 vdev_compact_children(pvd
);
3346 cvd
= pvd
->vdev_child
[0];
3347 if (pvd
->vdev_children
== 1) {
3348 vdev_remove_parent(cvd
);
3349 cvd
->vdev_splitting
= B_TRUE
;
3351 vdev_propagate_state(cvd
);
3355 vdev_deadman(vdev_t
*vd
)
3359 for (c
= 0; c
< vd
->vdev_children
; c
++) {
3360 vdev_t
*cvd
= vd
->vdev_child
[c
];
3365 if (vd
->vdev_ops
->vdev_op_leaf
) {
3366 vdev_queue_t
*vq
= &vd
->vdev_queue
;
3368 mutex_enter(&vq
->vq_lock
);
3369 if (avl_numnodes(&vq
->vq_active_tree
) > 0) {
3370 spa_t
*spa
= vd
->vdev_spa
;
3375 * Look at the head of all the pending queues,
3376 * if any I/O has been outstanding for longer than
3377 * the spa_deadman_synctime we log a zevent.
3379 fio
= avl_first(&vq
->vq_active_tree
);
3380 delta
= gethrtime() - fio
->io_timestamp
;
3381 if (delta
> spa_deadman_synctime(spa
)) {
3382 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, "
3383 "delta %lluns, last io %lluns",
3384 fio
->io_timestamp
, delta
,
3385 vq
->vq_io_complete_ts
);
3386 zfs_ereport_post(FM_EREPORT_ZFS_DELAY
,
3387 spa
, vd
, fio
, 0, 0);
3390 mutex_exit(&vq
->vq_lock
);
3394 #if defined(_KERNEL) && defined(HAVE_SPL)
3395 EXPORT_SYMBOL(vdev_fault
);
3396 EXPORT_SYMBOL(vdev_degrade
);
3397 EXPORT_SYMBOL(vdev_online
);
3398 EXPORT_SYMBOL(vdev_offline
);
3399 EXPORT_SYMBOL(vdev_clear
);
3401 module_param(metaslabs_per_vdev
, int, 0644);
3402 MODULE_PARM_DESC(metaslabs_per_vdev
,
3403 "Divide added vdev into approximately (but no more than) this number "