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.
26 #include <sys/zfs_context.h>
27 #include <sys/fm/fs/zfs.h>
29 #include <sys/spa_impl.h>
31 #include <sys/dmu_tx.h>
32 #include <sys/vdev_impl.h>
33 #include <sys/uberblock_impl.h>
34 #include <sys/metaslab.h>
35 #include <sys/metaslab_impl.h>
36 #include <sys/space_map.h>
39 #include <sys/fs/zfs.h>
42 #include <sys/dsl_scan.h>
45 * Virtual device management.
48 static vdev_ops_t
*vdev_ops_table
[] = {
61 /* maximum scrub/resilver I/O queue per leaf vdev */
62 int zfs_scrub_limit
= 10;
65 * Given a vdev type, return the appropriate ops vector.
68 vdev_getops(const char *type
)
70 vdev_ops_t
*ops
, **opspp
;
72 for (opspp
= vdev_ops_table
; (ops
= *opspp
) != NULL
; opspp
++)
73 if (strcmp(ops
->vdev_op_type
, type
) == 0)
80 * Default asize function: return the MAX of psize with the asize of
81 * all children. This is what's used by anything other than RAID-Z.
84 vdev_default_asize(vdev_t
*vd
, uint64_t psize
)
86 uint64_t asize
= P2ROUNDUP(psize
, 1ULL << vd
->vdev_top
->vdev_ashift
);
89 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
90 csize
= vdev_psize_to_asize(vd
->vdev_child
[c
], psize
);
91 asize
= MAX(asize
, csize
);
98 * Get the minimum allocatable size. We define the allocatable size as
99 * the vdev's asize rounded to the nearest metaslab. This allows us to
100 * replace or attach devices which don't have the same physical size but
101 * can still satisfy the same number of allocations.
104 vdev_get_min_asize(vdev_t
*vd
)
106 vdev_t
*pvd
= vd
->vdev_parent
;
109 * The our parent is NULL (inactive spare or cache) or is the root,
110 * just return our own asize.
113 return (vd
->vdev_asize
);
116 * The top-level vdev just returns the allocatable size rounded
117 * to the nearest metaslab.
119 if (vd
== vd
->vdev_top
)
120 return (P2ALIGN(vd
->vdev_asize
, 1ULL << vd
->vdev_ms_shift
));
123 * The allocatable space for a raidz vdev is N * sizeof(smallest child),
124 * so each child must provide at least 1/Nth of its asize.
126 if (pvd
->vdev_ops
== &vdev_raidz_ops
)
127 return (pvd
->vdev_min_asize
/ pvd
->vdev_children
);
129 return (pvd
->vdev_min_asize
);
133 vdev_set_min_asize(vdev_t
*vd
)
135 vd
->vdev_min_asize
= vdev_get_min_asize(vd
);
137 for (int c
= 0; c
< vd
->vdev_children
; c
++)
138 vdev_set_min_asize(vd
->vdev_child
[c
]);
142 vdev_lookup_top(spa_t
*spa
, uint64_t vdev
)
144 vdev_t
*rvd
= spa
->spa_root_vdev
;
146 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
148 if (vdev
< rvd
->vdev_children
) {
149 ASSERT(rvd
->vdev_child
[vdev
] != NULL
);
150 return (rvd
->vdev_child
[vdev
]);
157 vdev_lookup_by_guid(vdev_t
*vd
, uint64_t guid
)
161 if (vd
->vdev_guid
== guid
)
164 for (int c
= 0; c
< vd
->vdev_children
; c
++)
165 if ((mvd
= vdev_lookup_by_guid(vd
->vdev_child
[c
], guid
)) !=
173 vdev_add_child(vdev_t
*pvd
, vdev_t
*cvd
)
175 size_t oldsize
, newsize
;
176 uint64_t id
= cvd
->vdev_id
;
179 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
180 ASSERT(cvd
->vdev_parent
== NULL
);
182 cvd
->vdev_parent
= pvd
;
187 ASSERT(id
>= pvd
->vdev_children
|| pvd
->vdev_child
[id
] == NULL
);
189 oldsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
190 pvd
->vdev_children
= MAX(pvd
->vdev_children
, id
+ 1);
191 newsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
193 newchild
= kmem_zalloc(newsize
, KM_SLEEP
);
194 if (pvd
->vdev_child
!= NULL
) {
195 bcopy(pvd
->vdev_child
, newchild
, oldsize
);
196 kmem_free(pvd
->vdev_child
, oldsize
);
199 pvd
->vdev_child
= newchild
;
200 pvd
->vdev_child
[id
] = cvd
;
202 cvd
->vdev_top
= (pvd
->vdev_top
? pvd
->vdev_top
: cvd
);
203 ASSERT(cvd
->vdev_top
->vdev_parent
->vdev_parent
== NULL
);
206 * Walk up all ancestors to update guid sum.
208 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
209 pvd
->vdev_guid_sum
+= cvd
->vdev_guid_sum
;
213 vdev_remove_child(vdev_t
*pvd
, vdev_t
*cvd
)
216 uint_t id
= cvd
->vdev_id
;
218 ASSERT(cvd
->vdev_parent
== pvd
);
223 ASSERT(id
< pvd
->vdev_children
);
224 ASSERT(pvd
->vdev_child
[id
] == cvd
);
226 pvd
->vdev_child
[id
] = NULL
;
227 cvd
->vdev_parent
= NULL
;
229 for (c
= 0; c
< pvd
->vdev_children
; c
++)
230 if (pvd
->vdev_child
[c
])
233 if (c
== pvd
->vdev_children
) {
234 kmem_free(pvd
->vdev_child
, c
* sizeof (vdev_t
*));
235 pvd
->vdev_child
= NULL
;
236 pvd
->vdev_children
= 0;
240 * Walk up all ancestors to update guid sum.
242 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
243 pvd
->vdev_guid_sum
-= cvd
->vdev_guid_sum
;
247 * Remove any holes in the child array.
250 vdev_compact_children(vdev_t
*pvd
)
252 vdev_t
**newchild
, *cvd
;
253 int oldc
= pvd
->vdev_children
;
256 ASSERT(spa_config_held(pvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
258 for (int c
= newc
= 0; c
< oldc
; c
++)
259 if (pvd
->vdev_child
[c
])
262 newchild
= kmem_alloc(newc
* sizeof (vdev_t
*), KM_SLEEP
);
264 for (int c
= newc
= 0; c
< oldc
; c
++) {
265 if ((cvd
= pvd
->vdev_child
[c
]) != NULL
) {
266 newchild
[newc
] = cvd
;
267 cvd
->vdev_id
= newc
++;
271 kmem_free(pvd
->vdev_child
, oldc
* sizeof (vdev_t
*));
272 pvd
->vdev_child
= newchild
;
273 pvd
->vdev_children
= newc
;
277 * Allocate and minimally initialize a vdev_t.
280 vdev_alloc_common(spa_t
*spa
, uint_t id
, uint64_t guid
, vdev_ops_t
*ops
)
284 vd
= kmem_zalloc(sizeof (vdev_t
), KM_SLEEP
);
286 if (spa
->spa_root_vdev
== NULL
) {
287 ASSERT(ops
== &vdev_root_ops
);
288 spa
->spa_root_vdev
= vd
;
291 if (guid
== 0 && ops
!= &vdev_hole_ops
) {
292 if (spa
->spa_root_vdev
== vd
) {
294 * The root vdev's guid will also be the pool guid,
295 * which must be unique among all pools.
297 guid
= spa_generate_guid(NULL
);
300 * Any other vdev's guid must be unique within the pool.
302 guid
= spa_generate_guid(spa
);
304 ASSERT(!spa_guid_exists(spa_guid(spa
), guid
));
309 vd
->vdev_guid
= guid
;
310 vd
->vdev_guid_sum
= guid
;
312 vd
->vdev_state
= VDEV_STATE_CLOSED
;
313 vd
->vdev_ishole
= (ops
== &vdev_hole_ops
);
315 mutex_init(&vd
->vdev_dtl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
316 mutex_init(&vd
->vdev_stat_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
317 mutex_init(&vd
->vdev_probe_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
318 for (int t
= 0; t
< DTL_TYPES
; t
++) {
319 space_map_create(&vd
->vdev_dtl
[t
], 0, -1ULL, 0,
322 txg_list_create(&vd
->vdev_ms_list
,
323 offsetof(struct metaslab
, ms_txg_node
));
324 txg_list_create(&vd
->vdev_dtl_list
,
325 offsetof(struct vdev
, vdev_dtl_node
));
326 vd
->vdev_stat
.vs_timestamp
= gethrtime();
334 * Allocate a new vdev. The 'alloctype' is used to control whether we are
335 * creating a new vdev or loading an existing one - the behavior is slightly
336 * different for each case.
339 vdev_alloc(spa_t
*spa
, vdev_t
**vdp
, nvlist_t
*nv
, vdev_t
*parent
, uint_t id
,
344 uint64_t guid
= 0, islog
, nparity
;
347 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
349 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_TYPE
, &type
) != 0)
352 if ((ops
= vdev_getops(type
)) == NULL
)
356 * If this is a load, get the vdev guid from the nvlist.
357 * Otherwise, vdev_alloc_common() will generate one for us.
359 if (alloctype
== VDEV_ALLOC_LOAD
) {
362 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ID
, &label_id
) ||
366 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
368 } else if (alloctype
== VDEV_ALLOC_SPARE
) {
369 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
371 } else if (alloctype
== VDEV_ALLOC_L2CACHE
) {
372 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
374 } else if (alloctype
== VDEV_ALLOC_ROOTPOOL
) {
375 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
380 * The first allocated vdev must be of type 'root'.
382 if (ops
!= &vdev_root_ops
&& spa
->spa_root_vdev
== NULL
)
386 * Determine whether we're a log vdev.
389 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_LOG
, &islog
);
390 if (islog
&& spa_version(spa
) < SPA_VERSION_SLOGS
)
393 if (ops
== &vdev_hole_ops
&& spa_version(spa
) < SPA_VERSION_HOLES
)
397 * Set the nparity property for RAID-Z vdevs.
400 if (ops
== &vdev_raidz_ops
) {
401 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NPARITY
,
403 if (nparity
== 0 || nparity
> VDEV_RAIDZ_MAXPARITY
)
406 * Previous versions could only support 1 or 2 parity
410 spa_version(spa
) < SPA_VERSION_RAIDZ2
)
413 spa_version(spa
) < SPA_VERSION_RAIDZ3
)
417 * We require the parity to be specified for SPAs that
418 * support multiple parity levels.
420 if (spa_version(spa
) >= SPA_VERSION_RAIDZ2
)
423 * Otherwise, we default to 1 parity device for RAID-Z.
430 ASSERT(nparity
!= -1ULL);
432 vd
= vdev_alloc_common(spa
, id
, guid
, ops
);
434 vd
->vdev_islog
= islog
;
435 vd
->vdev_nparity
= nparity
;
437 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PATH
, &vd
->vdev_path
) == 0)
438 vd
->vdev_path
= spa_strdup(vd
->vdev_path
);
439 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_DEVID
, &vd
->vdev_devid
) == 0)
440 vd
->vdev_devid
= spa_strdup(vd
->vdev_devid
);
441 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PHYS_PATH
,
442 &vd
->vdev_physpath
) == 0)
443 vd
->vdev_physpath
= spa_strdup(vd
->vdev_physpath
);
444 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_FRU
, &vd
->vdev_fru
) == 0)
445 vd
->vdev_fru
= spa_strdup(vd
->vdev_fru
);
448 * Set the whole_disk property. If it's not specified, leave the value
451 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_WHOLE_DISK
,
452 &vd
->vdev_wholedisk
) != 0)
453 vd
->vdev_wholedisk
= -1ULL;
456 * Look for the 'not present' flag. This will only be set if the device
457 * was not present at the time of import.
459 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NOT_PRESENT
,
460 &vd
->vdev_not_present
);
463 * Get the alignment requirement.
465 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASHIFT
, &vd
->vdev_ashift
);
468 * Retrieve the vdev creation time.
470 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_CREATE_TXG
,
474 * If we're a top-level vdev, try to load the allocation parameters.
476 if (parent
&& !parent
->vdev_parent
&&
477 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_SPLIT
)) {
478 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_ARRAY
,
480 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_SHIFT
,
482 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASIZE
,
484 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVING
,
488 if (parent
&& !parent
->vdev_parent
) {
489 ASSERT(alloctype
== VDEV_ALLOC_LOAD
||
490 alloctype
== VDEV_ALLOC_ADD
||
491 alloctype
== VDEV_ALLOC_SPLIT
||
492 alloctype
== VDEV_ALLOC_ROOTPOOL
);
493 vd
->vdev_mg
= metaslab_group_create(islog
?
494 spa_log_class(spa
) : spa_normal_class(spa
), vd
);
498 * If we're a leaf vdev, try to load the DTL object and other state.
500 if (vd
->vdev_ops
->vdev_op_leaf
&&
501 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_L2CACHE
||
502 alloctype
== VDEV_ALLOC_ROOTPOOL
)) {
503 if (alloctype
== VDEV_ALLOC_LOAD
) {
504 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DTL
,
505 &vd
->vdev_dtl_smo
.smo_object
);
506 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_UNSPARE
,
510 if (alloctype
== VDEV_ALLOC_ROOTPOOL
) {
513 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_SPARE
,
514 &spare
) == 0 && spare
)
518 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_OFFLINE
,
521 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_RESILVERING
,
522 &vd
->vdev_resilvering
);
525 * When importing a pool, we want to ignore the persistent fault
526 * state, as the diagnosis made on another system may not be
527 * valid in the current context. Local vdevs will
528 * remain in the faulted state.
530 if (spa_load_state(spa
) == SPA_LOAD_OPEN
) {
531 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_FAULTED
,
533 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DEGRADED
,
535 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVED
,
538 if (vd
->vdev_faulted
|| vd
->vdev_degraded
) {
542 VDEV_AUX_ERR_EXCEEDED
;
543 if (nvlist_lookup_string(nv
,
544 ZPOOL_CONFIG_AUX_STATE
, &aux
) == 0 &&
545 strcmp(aux
, "external") == 0)
546 vd
->vdev_label_aux
= VDEV_AUX_EXTERNAL
;
552 * Add ourselves to the parent's list of children.
554 vdev_add_child(parent
, vd
);
562 vdev_free(vdev_t
*vd
)
564 spa_t
*spa
= vd
->vdev_spa
;
567 * vdev_free() implies closing the vdev first. This is simpler than
568 * trying to ensure complicated semantics for all callers.
572 ASSERT(!list_link_active(&vd
->vdev_config_dirty_node
));
573 ASSERT(!list_link_active(&vd
->vdev_state_dirty_node
));
578 for (int c
= 0; c
< vd
->vdev_children
; c
++)
579 vdev_free(vd
->vdev_child
[c
]);
581 ASSERT(vd
->vdev_child
== NULL
);
582 ASSERT(vd
->vdev_guid_sum
== vd
->vdev_guid
);
585 * Discard allocation state.
587 if (vd
->vdev_mg
!= NULL
) {
588 vdev_metaslab_fini(vd
);
589 metaslab_group_destroy(vd
->vdev_mg
);
592 ASSERT3U(vd
->vdev_stat
.vs_space
, ==, 0);
593 ASSERT3U(vd
->vdev_stat
.vs_dspace
, ==, 0);
594 ASSERT3U(vd
->vdev_stat
.vs_alloc
, ==, 0);
597 * Remove this vdev from its parent's child list.
599 vdev_remove_child(vd
->vdev_parent
, vd
);
601 ASSERT(vd
->vdev_parent
== NULL
);
604 * Clean up vdev structure.
610 spa_strfree(vd
->vdev_path
);
612 spa_strfree(vd
->vdev_devid
);
613 if (vd
->vdev_physpath
)
614 spa_strfree(vd
->vdev_physpath
);
616 spa_strfree(vd
->vdev_fru
);
618 if (vd
->vdev_isspare
)
619 spa_spare_remove(vd
);
620 if (vd
->vdev_isl2cache
)
621 spa_l2cache_remove(vd
);
623 txg_list_destroy(&vd
->vdev_ms_list
);
624 txg_list_destroy(&vd
->vdev_dtl_list
);
626 mutex_enter(&vd
->vdev_dtl_lock
);
627 for (int t
= 0; t
< DTL_TYPES
; t
++) {
628 space_map_unload(&vd
->vdev_dtl
[t
]);
629 space_map_destroy(&vd
->vdev_dtl
[t
]);
631 mutex_exit(&vd
->vdev_dtl_lock
);
633 mutex_destroy(&vd
->vdev_dtl_lock
);
634 mutex_destroy(&vd
->vdev_stat_lock
);
635 mutex_destroy(&vd
->vdev_probe_lock
);
637 if (vd
== spa
->spa_root_vdev
)
638 spa
->spa_root_vdev
= NULL
;
640 kmem_free(vd
, sizeof (vdev_t
));
644 * Transfer top-level vdev state from svd to tvd.
647 vdev_top_transfer(vdev_t
*svd
, vdev_t
*tvd
)
649 spa_t
*spa
= svd
->vdev_spa
;
654 ASSERT(tvd
== tvd
->vdev_top
);
656 tvd
->vdev_ms_array
= svd
->vdev_ms_array
;
657 tvd
->vdev_ms_shift
= svd
->vdev_ms_shift
;
658 tvd
->vdev_ms_count
= svd
->vdev_ms_count
;
660 svd
->vdev_ms_array
= 0;
661 svd
->vdev_ms_shift
= 0;
662 svd
->vdev_ms_count
= 0;
664 tvd
->vdev_mg
= svd
->vdev_mg
;
665 tvd
->vdev_ms
= svd
->vdev_ms
;
670 if (tvd
->vdev_mg
!= NULL
)
671 tvd
->vdev_mg
->mg_vd
= tvd
;
673 tvd
->vdev_stat
.vs_alloc
= svd
->vdev_stat
.vs_alloc
;
674 tvd
->vdev_stat
.vs_space
= svd
->vdev_stat
.vs_space
;
675 tvd
->vdev_stat
.vs_dspace
= svd
->vdev_stat
.vs_dspace
;
677 svd
->vdev_stat
.vs_alloc
= 0;
678 svd
->vdev_stat
.vs_space
= 0;
679 svd
->vdev_stat
.vs_dspace
= 0;
681 for (t
= 0; t
< TXG_SIZE
; t
++) {
682 while ((msp
= txg_list_remove(&svd
->vdev_ms_list
, t
)) != NULL
)
683 (void) txg_list_add(&tvd
->vdev_ms_list
, msp
, t
);
684 while ((vd
= txg_list_remove(&svd
->vdev_dtl_list
, t
)) != NULL
)
685 (void) txg_list_add(&tvd
->vdev_dtl_list
, vd
, t
);
686 if (txg_list_remove_this(&spa
->spa_vdev_txg_list
, svd
, t
))
687 (void) txg_list_add(&spa
->spa_vdev_txg_list
, tvd
, t
);
690 if (list_link_active(&svd
->vdev_config_dirty_node
)) {
691 vdev_config_clean(svd
);
692 vdev_config_dirty(tvd
);
695 if (list_link_active(&svd
->vdev_state_dirty_node
)) {
696 vdev_state_clean(svd
);
697 vdev_state_dirty(tvd
);
700 tvd
->vdev_deflate_ratio
= svd
->vdev_deflate_ratio
;
701 svd
->vdev_deflate_ratio
= 0;
703 tvd
->vdev_islog
= svd
->vdev_islog
;
708 vdev_top_update(vdev_t
*tvd
, vdev_t
*vd
)
715 for (int c
= 0; c
< vd
->vdev_children
; c
++)
716 vdev_top_update(tvd
, vd
->vdev_child
[c
]);
720 * Add a mirror/replacing vdev above an existing vdev.
723 vdev_add_parent(vdev_t
*cvd
, vdev_ops_t
*ops
)
725 spa_t
*spa
= cvd
->vdev_spa
;
726 vdev_t
*pvd
= cvd
->vdev_parent
;
729 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
731 mvd
= vdev_alloc_common(spa
, cvd
->vdev_id
, 0, ops
);
733 mvd
->vdev_asize
= cvd
->vdev_asize
;
734 mvd
->vdev_min_asize
= cvd
->vdev_min_asize
;
735 mvd
->vdev_ashift
= cvd
->vdev_ashift
;
736 mvd
->vdev_state
= cvd
->vdev_state
;
737 mvd
->vdev_crtxg
= cvd
->vdev_crtxg
;
739 vdev_remove_child(pvd
, cvd
);
740 vdev_add_child(pvd
, mvd
);
741 cvd
->vdev_id
= mvd
->vdev_children
;
742 vdev_add_child(mvd
, cvd
);
743 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
745 if (mvd
== mvd
->vdev_top
)
746 vdev_top_transfer(cvd
, mvd
);
752 * Remove a 1-way mirror/replacing vdev from the tree.
755 vdev_remove_parent(vdev_t
*cvd
)
757 vdev_t
*mvd
= cvd
->vdev_parent
;
758 vdev_t
*pvd
= mvd
->vdev_parent
;
760 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
762 ASSERT(mvd
->vdev_children
== 1);
763 ASSERT(mvd
->vdev_ops
== &vdev_mirror_ops
||
764 mvd
->vdev_ops
== &vdev_replacing_ops
||
765 mvd
->vdev_ops
== &vdev_spare_ops
);
766 cvd
->vdev_ashift
= mvd
->vdev_ashift
;
768 vdev_remove_child(mvd
, cvd
);
769 vdev_remove_child(pvd
, mvd
);
772 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
773 * Otherwise, we could have detached an offline device, and when we
774 * go to import the pool we'll think we have two top-level vdevs,
775 * instead of a different version of the same top-level vdev.
777 if (mvd
->vdev_top
== mvd
) {
778 uint64_t guid_delta
= mvd
->vdev_guid
- cvd
->vdev_guid
;
779 cvd
->vdev_orig_guid
= cvd
->vdev_guid
;
780 cvd
->vdev_guid
+= guid_delta
;
781 cvd
->vdev_guid_sum
+= guid_delta
;
783 cvd
->vdev_id
= mvd
->vdev_id
;
784 vdev_add_child(pvd
, cvd
);
785 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
787 if (cvd
== cvd
->vdev_top
)
788 vdev_top_transfer(mvd
, cvd
);
790 ASSERT(mvd
->vdev_children
== 0);
795 vdev_metaslab_init(vdev_t
*vd
, uint64_t txg
)
797 spa_t
*spa
= vd
->vdev_spa
;
798 objset_t
*mos
= spa
->spa_meta_objset
;
800 uint64_t oldc
= vd
->vdev_ms_count
;
801 uint64_t newc
= vd
->vdev_asize
>> vd
->vdev_ms_shift
;
805 ASSERT(txg
== 0 || spa_config_held(spa
, SCL_ALLOC
, RW_WRITER
));
808 * This vdev is not being allocated from yet or is a hole.
810 if (vd
->vdev_ms_shift
== 0)
813 ASSERT(!vd
->vdev_ishole
);
816 * Compute the raidz-deflation ratio. Note, we hard-code
817 * in 128k (1 << 17) because it is the current "typical" blocksize.
818 * Even if SPA_MAXBLOCKSIZE changes, this algorithm must never change,
819 * or we will inconsistently account for existing bp's.
821 vd
->vdev_deflate_ratio
= (1 << 17) /
822 (vdev_psize_to_asize(vd
, 1 << 17) >> SPA_MINBLOCKSHIFT
);
824 ASSERT(oldc
<= newc
);
826 mspp
= kmem_zalloc(newc
* sizeof (*mspp
), KM_SLEEP
);
829 bcopy(vd
->vdev_ms
, mspp
, oldc
* sizeof (*mspp
));
830 kmem_free(vd
->vdev_ms
, oldc
* sizeof (*mspp
));
834 vd
->vdev_ms_count
= newc
;
836 for (m
= oldc
; m
< newc
; m
++) {
837 space_map_obj_t smo
= { 0, 0, 0 };
840 error
= dmu_read(mos
, vd
->vdev_ms_array
,
841 m
* sizeof (uint64_t), sizeof (uint64_t), &object
,
847 error
= dmu_bonus_hold(mos
, object
, FTAG
, &db
);
850 ASSERT3U(db
->db_size
, >=, sizeof (smo
));
851 bcopy(db
->db_data
, &smo
, sizeof (smo
));
852 ASSERT3U(smo
.smo_object
, ==, object
);
853 dmu_buf_rele(db
, FTAG
);
856 vd
->vdev_ms
[m
] = metaslab_init(vd
->vdev_mg
, &smo
,
857 m
<< vd
->vdev_ms_shift
, 1ULL << vd
->vdev_ms_shift
, txg
);
861 spa_config_enter(spa
, SCL_ALLOC
, FTAG
, RW_WRITER
);
864 * If the vdev is being removed we don't activate
865 * the metaslabs since we want to ensure that no new
866 * allocations are performed on this device.
868 if (oldc
== 0 && !vd
->vdev_removing
)
869 metaslab_group_activate(vd
->vdev_mg
);
872 spa_config_exit(spa
, SCL_ALLOC
, FTAG
);
878 vdev_metaslab_fini(vdev_t
*vd
)
881 uint64_t count
= vd
->vdev_ms_count
;
883 if (vd
->vdev_ms
!= NULL
) {
884 metaslab_group_passivate(vd
->vdev_mg
);
885 for (m
= 0; m
< count
; m
++)
886 if (vd
->vdev_ms
[m
] != NULL
)
887 metaslab_fini(vd
->vdev_ms
[m
]);
888 kmem_free(vd
->vdev_ms
, count
* sizeof (metaslab_t
*));
893 typedef struct vdev_probe_stats
{
894 boolean_t vps_readable
;
895 boolean_t vps_writeable
;
897 } vdev_probe_stats_t
;
900 vdev_probe_done(zio_t
*zio
)
902 spa_t
*spa
= zio
->io_spa
;
903 vdev_t
*vd
= zio
->io_vd
;
904 vdev_probe_stats_t
*vps
= zio
->io_private
;
906 ASSERT(vd
->vdev_probe_zio
!= NULL
);
908 if (zio
->io_type
== ZIO_TYPE_READ
) {
909 if (zio
->io_error
== 0)
910 vps
->vps_readable
= 1;
911 if (zio
->io_error
== 0 && spa_writeable(spa
)) {
912 zio_nowait(zio_write_phys(vd
->vdev_probe_zio
, vd
,
913 zio
->io_offset
, zio
->io_size
, zio
->io_data
,
914 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
915 ZIO_PRIORITY_SYNC_WRITE
, vps
->vps_flags
, B_TRUE
));
917 zio_buf_free(zio
->io_data
, zio
->io_size
);
919 } else if (zio
->io_type
== ZIO_TYPE_WRITE
) {
920 if (zio
->io_error
== 0)
921 vps
->vps_writeable
= 1;
922 zio_buf_free(zio
->io_data
, zio
->io_size
);
923 } else if (zio
->io_type
== ZIO_TYPE_NULL
) {
926 vd
->vdev_cant_read
|= !vps
->vps_readable
;
927 vd
->vdev_cant_write
|= !vps
->vps_writeable
;
929 if (vdev_readable(vd
) &&
930 (vdev_writeable(vd
) || !spa_writeable(spa
))) {
933 ASSERT(zio
->io_error
!= 0);
934 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE
,
935 spa
, vd
, NULL
, 0, 0);
936 zio
->io_error
= ENXIO
;
939 mutex_enter(&vd
->vdev_probe_lock
);
940 ASSERT(vd
->vdev_probe_zio
== zio
);
941 vd
->vdev_probe_zio
= NULL
;
942 mutex_exit(&vd
->vdev_probe_lock
);
944 while ((pio
= zio_walk_parents(zio
)) != NULL
)
945 if (!vdev_accessible(vd
, pio
))
946 pio
->io_error
= ENXIO
;
948 kmem_free(vps
, sizeof (*vps
));
953 * Determine whether this device is accessible by reading and writing
954 * to several known locations: the pad regions of each vdev label
955 * but the first (which we leave alone in case it contains a VTOC).
958 vdev_probe(vdev_t
*vd
, zio_t
*zio
)
960 spa_t
*spa
= vd
->vdev_spa
;
961 vdev_probe_stats_t
*vps
= NULL
;
964 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
967 * Don't probe the probe.
969 if (zio
&& (zio
->io_flags
& ZIO_FLAG_PROBE
))
973 * To prevent 'probe storms' when a device fails, we create
974 * just one probe i/o at a time. All zios that want to probe
975 * this vdev will become parents of the probe io.
977 mutex_enter(&vd
->vdev_probe_lock
);
979 if ((pio
= vd
->vdev_probe_zio
) == NULL
) {
980 vps
= kmem_zalloc(sizeof (*vps
), KM_SLEEP
);
982 vps
->vps_flags
= ZIO_FLAG_CANFAIL
| ZIO_FLAG_PROBE
|
983 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
|
986 if (spa_config_held(spa
, SCL_ZIO
, RW_WRITER
)) {
988 * vdev_cant_read and vdev_cant_write can only
989 * transition from TRUE to FALSE when we have the
990 * SCL_ZIO lock as writer; otherwise they can only
991 * transition from FALSE to TRUE. This ensures that
992 * any zio looking at these values can assume that
993 * failures persist for the life of the I/O. That's
994 * important because when a device has intermittent
995 * connectivity problems, we want to ensure that
996 * they're ascribed to the device (ENXIO) and not
999 * Since we hold SCL_ZIO as writer here, clear both
1000 * values so the probe can reevaluate from first
1003 vps
->vps_flags
|= ZIO_FLAG_CONFIG_WRITER
;
1004 vd
->vdev_cant_read
= B_FALSE
;
1005 vd
->vdev_cant_write
= B_FALSE
;
1008 vd
->vdev_probe_zio
= pio
= zio_null(NULL
, spa
, vd
,
1009 vdev_probe_done
, vps
,
1010 vps
->vps_flags
| ZIO_FLAG_DONT_PROPAGATE
);
1013 * We can't change the vdev state in this context, so we
1014 * kick off an async task to do it on our behalf.
1017 vd
->vdev_probe_wanted
= B_TRUE
;
1018 spa_async_request(spa
, SPA_ASYNC_PROBE
);
1023 zio_add_child(zio
, pio
);
1025 mutex_exit(&vd
->vdev_probe_lock
);
1028 ASSERT(zio
!= NULL
);
1032 for (int l
= 1; l
< VDEV_LABELS
; l
++) {
1033 zio_nowait(zio_read_phys(pio
, vd
,
1034 vdev_label_offset(vd
->vdev_psize
, l
,
1035 offsetof(vdev_label_t
, vl_pad2
)),
1036 VDEV_PAD_SIZE
, zio_buf_alloc(VDEV_PAD_SIZE
),
1037 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
1038 ZIO_PRIORITY_SYNC_READ
, vps
->vps_flags
, B_TRUE
));
1049 vdev_open_child(void *arg
)
1053 vd
->vdev_open_thread
= curthread
;
1054 vd
->vdev_open_error
= vdev_open(vd
);
1055 vd
->vdev_open_thread
= NULL
;
1059 vdev_uses_zvols(vdev_t
*vd
)
1061 if (vd
->vdev_path
&& strncmp(vd
->vdev_path
, ZVOL_DIR
,
1062 strlen(ZVOL_DIR
)) == 0)
1064 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1065 if (vdev_uses_zvols(vd
->vdev_child
[c
]))
1071 vdev_open_children(vdev_t
*vd
)
1074 int children
= vd
->vdev_children
;
1077 * in order to handle pools on top of zvols, do the opens
1078 * in a single thread so that the same thread holds the
1079 * spa_namespace_lock
1081 if (vdev_uses_zvols(vd
)) {
1082 for (int c
= 0; c
< children
; c
++)
1083 vd
->vdev_child
[c
]->vdev_open_error
=
1084 vdev_open(vd
->vdev_child
[c
]);
1087 tq
= taskq_create("vdev_open", children
, minclsyspri
,
1088 children
, children
, TASKQ_PREPOPULATE
);
1090 for (int c
= 0; c
< children
; c
++)
1091 VERIFY(taskq_dispatch(tq
, vdev_open_child
, vd
->vdev_child
[c
],
1098 * Prepare a virtual device for access.
1101 vdev_open(vdev_t
*vd
)
1103 spa_t
*spa
= vd
->vdev_spa
;
1106 uint64_t asize
, psize
;
1107 uint64_t ashift
= 0;
1109 ASSERT(vd
->vdev_open_thread
== curthread
||
1110 spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1111 ASSERT(vd
->vdev_state
== VDEV_STATE_CLOSED
||
1112 vd
->vdev_state
== VDEV_STATE_CANT_OPEN
||
1113 vd
->vdev_state
== VDEV_STATE_OFFLINE
);
1115 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1116 vd
->vdev_cant_read
= B_FALSE
;
1117 vd
->vdev_cant_write
= B_FALSE
;
1118 vd
->vdev_min_asize
= vdev_get_min_asize(vd
);
1121 * If this vdev is not removed, check its fault status. If it's
1122 * faulted, bail out of the open.
1124 if (!vd
->vdev_removed
&& vd
->vdev_faulted
) {
1125 ASSERT(vd
->vdev_children
== 0);
1126 ASSERT(vd
->vdev_label_aux
== VDEV_AUX_ERR_EXCEEDED
||
1127 vd
->vdev_label_aux
== VDEV_AUX_EXTERNAL
);
1128 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1129 vd
->vdev_label_aux
);
1131 } else if (vd
->vdev_offline
) {
1132 ASSERT(vd
->vdev_children
== 0);
1133 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_OFFLINE
, VDEV_AUX_NONE
);
1137 error
= vd
->vdev_ops
->vdev_op_open(vd
, &osize
, &ashift
);
1140 * Reset the vdev_reopening flag so that we actually close
1141 * the vdev on error.
1143 vd
->vdev_reopening
= B_FALSE
;
1144 if (zio_injection_enabled
&& error
== 0)
1145 error
= zio_handle_device_injection(vd
, NULL
, ENXIO
);
1148 if (vd
->vdev_removed
&&
1149 vd
->vdev_stat
.vs_aux
!= VDEV_AUX_OPEN_FAILED
)
1150 vd
->vdev_removed
= B_FALSE
;
1152 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1153 vd
->vdev_stat
.vs_aux
);
1157 vd
->vdev_removed
= B_FALSE
;
1160 * Recheck the faulted flag now that we have confirmed that
1161 * the vdev is accessible. If we're faulted, bail.
1163 if (vd
->vdev_faulted
) {
1164 ASSERT(vd
->vdev_children
== 0);
1165 ASSERT(vd
->vdev_label_aux
== VDEV_AUX_ERR_EXCEEDED
||
1166 vd
->vdev_label_aux
== VDEV_AUX_EXTERNAL
);
1167 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1168 vd
->vdev_label_aux
);
1172 if (vd
->vdev_degraded
) {
1173 ASSERT(vd
->vdev_children
== 0);
1174 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
1175 VDEV_AUX_ERR_EXCEEDED
);
1177 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_HEALTHY
, 0);
1181 * For hole or missing vdevs we just return success.
1183 if (vd
->vdev_ishole
|| vd
->vdev_ops
== &vdev_missing_ops
)
1186 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
1187 if (vd
->vdev_child
[c
]->vdev_state
!= VDEV_STATE_HEALTHY
) {
1188 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
1194 osize
= P2ALIGN(osize
, (uint64_t)sizeof (vdev_label_t
));
1196 if (vd
->vdev_children
== 0) {
1197 if (osize
< SPA_MINDEVSIZE
) {
1198 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1199 VDEV_AUX_TOO_SMALL
);
1203 asize
= osize
- (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
);
1205 if (vd
->vdev_parent
!= NULL
&& osize
< SPA_MINDEVSIZE
-
1206 (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
)) {
1207 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1208 VDEV_AUX_TOO_SMALL
);
1215 vd
->vdev_psize
= psize
;
1218 * Make sure the allocatable size hasn't shrunk.
1220 if (asize
< vd
->vdev_min_asize
) {
1221 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1222 VDEV_AUX_BAD_LABEL
);
1226 if (vd
->vdev_asize
== 0) {
1228 * This is the first-ever open, so use the computed values.
1229 * For testing purposes, a higher ashift can be requested.
1231 vd
->vdev_asize
= asize
;
1232 vd
->vdev_ashift
= MAX(ashift
, vd
->vdev_ashift
);
1235 * Make sure the alignment requirement hasn't increased.
1237 if (ashift
> vd
->vdev_top
->vdev_ashift
) {
1238 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1239 VDEV_AUX_BAD_LABEL
);
1245 * If all children are healthy and the asize has increased,
1246 * then we've experienced dynamic LUN growth. If automatic
1247 * expansion is enabled then use the additional space.
1249 if (vd
->vdev_state
== VDEV_STATE_HEALTHY
&& asize
> vd
->vdev_asize
&&
1250 (vd
->vdev_expanding
|| spa
->spa_autoexpand
))
1251 vd
->vdev_asize
= asize
;
1253 vdev_set_min_asize(vd
);
1256 * Ensure we can issue some IO before declaring the
1257 * vdev open for business.
1259 if (vd
->vdev_ops
->vdev_op_leaf
&&
1260 (error
= zio_wait(vdev_probe(vd
, NULL
))) != 0) {
1261 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1262 VDEV_AUX_ERR_EXCEEDED
);
1267 * If a leaf vdev has a DTL, and seems healthy, then kick off a
1268 * resilver. But don't do this if we are doing a reopen for a scrub,
1269 * since this would just restart the scrub we are already doing.
1271 if (vd
->vdev_ops
->vdev_op_leaf
&& !spa
->spa_scrub_reopen
&&
1272 vdev_resilver_needed(vd
, NULL
, NULL
))
1273 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
1279 * Called once the vdevs are all opened, this routine validates the label
1280 * contents. This needs to be done before vdev_load() so that we don't
1281 * inadvertently do repair I/Os to the wrong device.
1283 * This function will only return failure if one of the vdevs indicates that it
1284 * has since been destroyed or exported. This is only possible if
1285 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
1286 * will be updated but the function will return 0.
1289 vdev_validate(vdev_t
*vd
)
1291 spa_t
*spa
= vd
->vdev_spa
;
1293 uint64_t guid
= 0, top_guid
;
1296 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1297 if (vdev_validate(vd
->vdev_child
[c
]) != 0)
1301 * If the device has already failed, or was marked offline, don't do
1302 * any further validation. Otherwise, label I/O will fail and we will
1303 * overwrite the previous state.
1305 if (vd
->vdev_ops
->vdev_op_leaf
&& vdev_readable(vd
)) {
1306 uint64_t aux_guid
= 0;
1309 if ((label
= vdev_label_read_config(vd
)) == NULL
) {
1310 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1311 VDEV_AUX_BAD_LABEL
);
1316 * Determine if this vdev has been split off into another
1317 * pool. If so, then refuse to open it.
1319 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_SPLIT_GUID
,
1320 &aux_guid
) == 0 && aux_guid
== spa_guid(spa
)) {
1321 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1322 VDEV_AUX_SPLIT_POOL
);
1327 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_GUID
,
1328 &guid
) != 0 || guid
!= spa_guid(spa
)) {
1329 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1330 VDEV_AUX_CORRUPT_DATA
);
1335 if (nvlist_lookup_nvlist(label
, ZPOOL_CONFIG_VDEV_TREE
, &nvl
)
1336 != 0 || nvlist_lookup_uint64(nvl
, ZPOOL_CONFIG_ORIG_GUID
,
1341 * If this vdev just became a top-level vdev because its
1342 * sibling was detached, it will have adopted the parent's
1343 * vdev guid -- but the label may or may not be on disk yet.
1344 * Fortunately, either version of the label will have the
1345 * same top guid, so if we're a top-level vdev, we can
1346 * safely compare to that instead.
1348 * If we split this vdev off instead, then we also check the
1349 * original pool's guid. We don't want to consider the vdev
1350 * corrupt if it is partway through a split operation.
1352 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
,
1354 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_TOP_GUID
,
1356 ((vd
->vdev_guid
!= guid
&& vd
->vdev_guid
!= aux_guid
) &&
1357 (vd
->vdev_guid
!= top_guid
|| vd
!= vd
->vdev_top
))) {
1358 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1359 VDEV_AUX_CORRUPT_DATA
);
1364 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
,
1366 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1367 VDEV_AUX_CORRUPT_DATA
);
1375 * If this is a verbatim import, no need to check the
1376 * state of the pool.
1378 if (!(spa
->spa_import_flags
& ZFS_IMPORT_VERBATIM
) &&
1379 spa_load_state(spa
) == SPA_LOAD_OPEN
&&
1380 state
!= POOL_STATE_ACTIVE
)
1384 * If we were able to open and validate a vdev that was
1385 * previously marked permanently unavailable, clear that state
1388 if (vd
->vdev_not_present
)
1389 vd
->vdev_not_present
= 0;
1396 * Close a virtual device.
1399 vdev_close(vdev_t
*vd
)
1401 spa_t
*spa
= vd
->vdev_spa
;
1402 vdev_t
*pvd
= vd
->vdev_parent
;
1404 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1407 * If our parent is reopening, then we are as well, unless we are
1410 if (pvd
!= NULL
&& pvd
->vdev_reopening
)
1411 vd
->vdev_reopening
= (pvd
->vdev_reopening
&& !vd
->vdev_offline
);
1413 vd
->vdev_ops
->vdev_op_close(vd
);
1415 vdev_cache_purge(vd
);
1418 * We record the previous state before we close it, so that if we are
1419 * doing a reopen(), we don't generate FMA ereports if we notice that
1420 * it's still faulted.
1422 vd
->vdev_prevstate
= vd
->vdev_state
;
1424 if (vd
->vdev_offline
)
1425 vd
->vdev_state
= VDEV_STATE_OFFLINE
;
1427 vd
->vdev_state
= VDEV_STATE_CLOSED
;
1428 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1432 vdev_hold(vdev_t
*vd
)
1434 spa_t
*spa
= vd
->vdev_spa
;
1436 ASSERT(spa_is_root(spa
));
1437 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1440 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1441 vdev_hold(vd
->vdev_child
[c
]);
1443 if (vd
->vdev_ops
->vdev_op_leaf
)
1444 vd
->vdev_ops
->vdev_op_hold(vd
);
1448 vdev_rele(vdev_t
*vd
)
1450 spa_t
*spa
= vd
->vdev_spa
;
1452 ASSERT(spa_is_root(spa
));
1453 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1454 vdev_rele(vd
->vdev_child
[c
]);
1456 if (vd
->vdev_ops
->vdev_op_leaf
)
1457 vd
->vdev_ops
->vdev_op_rele(vd
);
1461 * Reopen all interior vdevs and any unopened leaves. We don't actually
1462 * reopen leaf vdevs which had previously been opened as they might deadlock
1463 * on the spa_config_lock. Instead we only obtain the leaf's physical size.
1464 * If the leaf has never been opened then open it, as usual.
1467 vdev_reopen(vdev_t
*vd
)
1469 spa_t
*spa
= vd
->vdev_spa
;
1471 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1473 /* set the reopening flag unless we're taking the vdev offline */
1474 vd
->vdev_reopening
= !vd
->vdev_offline
;
1476 (void) vdev_open(vd
);
1479 * Call vdev_validate() here to make sure we have the same device.
1480 * Otherwise, a device with an invalid label could be successfully
1481 * opened in response to vdev_reopen().
1484 (void) vdev_validate_aux(vd
);
1485 if (vdev_readable(vd
) && vdev_writeable(vd
) &&
1486 vd
->vdev_aux
== &spa
->spa_l2cache
&&
1487 !l2arc_vdev_present(vd
))
1488 l2arc_add_vdev(spa
, vd
);
1490 (void) vdev_validate(vd
);
1494 * Reassess parent vdev's health.
1496 vdev_propagate_state(vd
);
1500 vdev_create(vdev_t
*vd
, uint64_t txg
, boolean_t isreplacing
)
1505 * Normally, partial opens (e.g. of a mirror) are allowed.
1506 * For a create, however, we want to fail the request if
1507 * there are any components we can't open.
1509 error
= vdev_open(vd
);
1511 if (error
|| vd
->vdev_state
!= VDEV_STATE_HEALTHY
) {
1513 return (error
? error
: ENXIO
);
1517 * Recursively initialize all labels.
1519 if ((error
= vdev_label_init(vd
, txg
, isreplacing
?
1520 VDEV_LABEL_REPLACE
: VDEV_LABEL_CREATE
)) != 0) {
1529 vdev_metaslab_set_size(vdev_t
*vd
)
1532 * Aim for roughly 200 metaslabs per vdev.
1534 vd
->vdev_ms_shift
= highbit(vd
->vdev_asize
/ 200);
1535 vd
->vdev_ms_shift
= MAX(vd
->vdev_ms_shift
, SPA_MAXBLOCKSHIFT
);
1539 vdev_dirty(vdev_t
*vd
, int flags
, void *arg
, uint64_t txg
)
1541 ASSERT(vd
== vd
->vdev_top
);
1542 ASSERT(!vd
->vdev_ishole
);
1543 ASSERT(ISP2(flags
));
1544 ASSERT(spa_writeable(vd
->vdev_spa
));
1546 if (flags
& VDD_METASLAB
)
1547 (void) txg_list_add(&vd
->vdev_ms_list
, arg
, txg
);
1549 if (flags
& VDD_DTL
)
1550 (void) txg_list_add(&vd
->vdev_dtl_list
, arg
, txg
);
1552 (void) txg_list_add(&vd
->vdev_spa
->spa_vdev_txg_list
, vd
, txg
);
1558 * A vdev's DTL (dirty time log) is the set of transaction groups for which
1559 * the vdev has less than perfect replication. There are four kinds of DTL:
1561 * DTL_MISSING: txgs for which the vdev has no valid copies of the data
1563 * DTL_PARTIAL: txgs for which data is available, but not fully replicated
1565 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
1566 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
1567 * txgs that was scrubbed.
1569 * DTL_OUTAGE: txgs which cannot currently be read, whether due to
1570 * persistent errors or just some device being offline.
1571 * Unlike the other three, the DTL_OUTAGE map is not generally
1572 * maintained; it's only computed when needed, typically to
1573 * determine whether a device can be detached.
1575 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
1576 * either has the data or it doesn't.
1578 * For interior vdevs such as mirror and RAID-Z the picture is more complex.
1579 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
1580 * if any child is less than fully replicated, then so is its parent.
1581 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
1582 * comprising only those txgs which appear in 'maxfaults' or more children;
1583 * those are the txgs we don't have enough replication to read. For example,
1584 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
1585 * thus, its DTL_MISSING consists of the set of txgs that appear in more than
1586 * two child DTL_MISSING maps.
1588 * It should be clear from the above that to compute the DTLs and outage maps
1589 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
1590 * Therefore, that is all we keep on disk. When loading the pool, or after
1591 * a configuration change, we generate all other DTLs from first principles.
1594 vdev_dtl_dirty(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
1596 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1598 ASSERT(t
< DTL_TYPES
);
1599 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
1600 ASSERT(spa_writeable(vd
->vdev_spa
));
1602 mutex_enter(sm
->sm_lock
);
1603 if (!space_map_contains(sm
, txg
, size
))
1604 space_map_add(sm
, txg
, size
);
1605 mutex_exit(sm
->sm_lock
);
1609 vdev_dtl_contains(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
1611 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1612 boolean_t dirty
= B_FALSE
;
1614 ASSERT(t
< DTL_TYPES
);
1615 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
1617 mutex_enter(sm
->sm_lock
);
1618 if (sm
->sm_space
!= 0)
1619 dirty
= space_map_contains(sm
, txg
, size
);
1620 mutex_exit(sm
->sm_lock
);
1626 vdev_dtl_empty(vdev_t
*vd
, vdev_dtl_type_t t
)
1628 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1631 mutex_enter(sm
->sm_lock
);
1632 empty
= (sm
->sm_space
== 0);
1633 mutex_exit(sm
->sm_lock
);
1639 * Reassess DTLs after a config change or scrub completion.
1642 vdev_dtl_reassess(vdev_t
*vd
, uint64_t txg
, uint64_t scrub_txg
, int scrub_done
)
1644 spa_t
*spa
= vd
->vdev_spa
;
1648 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
1650 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1651 vdev_dtl_reassess(vd
->vdev_child
[c
], txg
,
1652 scrub_txg
, scrub_done
);
1654 if (vd
== spa
->spa_root_vdev
|| vd
->vdev_ishole
|| vd
->vdev_aux
)
1657 if (vd
->vdev_ops
->vdev_op_leaf
) {
1658 dsl_scan_t
*scn
= spa
->spa_dsl_pool
->dp_scan
;
1660 mutex_enter(&vd
->vdev_dtl_lock
);
1661 if (scrub_txg
!= 0 &&
1662 (spa
->spa_scrub_started
||
1663 (scn
&& scn
->scn_phys
.scn_errors
== 0))) {
1665 * We completed a scrub up to scrub_txg. If we
1666 * did it without rebooting, then the scrub dtl
1667 * will be valid, so excise the old region and
1668 * fold in the scrub dtl. Otherwise, leave the
1669 * dtl as-is if there was an error.
1671 * There's little trick here: to excise the beginning
1672 * of the DTL_MISSING map, we put it into a reference
1673 * tree and then add a segment with refcnt -1 that
1674 * covers the range [0, scrub_txg). This means
1675 * that each txg in that range has refcnt -1 or 0.
1676 * We then add DTL_SCRUB with a refcnt of 2, so that
1677 * entries in the range [0, scrub_txg) will have a
1678 * positive refcnt -- either 1 or 2. We then convert
1679 * the reference tree into the new DTL_MISSING map.
1681 space_map_ref_create(&reftree
);
1682 space_map_ref_add_map(&reftree
,
1683 &vd
->vdev_dtl
[DTL_MISSING
], 1);
1684 space_map_ref_add_seg(&reftree
, 0, scrub_txg
, -1);
1685 space_map_ref_add_map(&reftree
,
1686 &vd
->vdev_dtl
[DTL_SCRUB
], 2);
1687 space_map_ref_generate_map(&reftree
,
1688 &vd
->vdev_dtl
[DTL_MISSING
], 1);
1689 space_map_ref_destroy(&reftree
);
1691 space_map_vacate(&vd
->vdev_dtl
[DTL_PARTIAL
], NULL
, NULL
);
1692 space_map_walk(&vd
->vdev_dtl
[DTL_MISSING
],
1693 space_map_add
, &vd
->vdev_dtl
[DTL_PARTIAL
]);
1695 space_map_vacate(&vd
->vdev_dtl
[DTL_SCRUB
], NULL
, NULL
);
1696 space_map_vacate(&vd
->vdev_dtl
[DTL_OUTAGE
], NULL
, NULL
);
1697 if (!vdev_readable(vd
))
1698 space_map_add(&vd
->vdev_dtl
[DTL_OUTAGE
], 0, -1ULL);
1700 space_map_walk(&vd
->vdev_dtl
[DTL_MISSING
],
1701 space_map_add
, &vd
->vdev_dtl
[DTL_OUTAGE
]);
1702 mutex_exit(&vd
->vdev_dtl_lock
);
1705 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, txg
);
1709 mutex_enter(&vd
->vdev_dtl_lock
);
1710 for (int t
= 0; t
< DTL_TYPES
; t
++) {
1711 /* account for child's outage in parent's missing map */
1712 int s
= (t
== DTL_MISSING
) ? DTL_OUTAGE
: t
;
1714 continue; /* leaf vdevs only */
1715 if (t
== DTL_PARTIAL
)
1716 minref
= 1; /* i.e. non-zero */
1717 else if (vd
->vdev_nparity
!= 0)
1718 minref
= vd
->vdev_nparity
+ 1; /* RAID-Z */
1720 minref
= vd
->vdev_children
; /* any kind of mirror */
1721 space_map_ref_create(&reftree
);
1722 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
1723 vdev_t
*cvd
= vd
->vdev_child
[c
];
1724 mutex_enter(&cvd
->vdev_dtl_lock
);
1725 space_map_ref_add_map(&reftree
, &cvd
->vdev_dtl
[s
], 1);
1726 mutex_exit(&cvd
->vdev_dtl_lock
);
1728 space_map_ref_generate_map(&reftree
, &vd
->vdev_dtl
[t
], minref
);
1729 space_map_ref_destroy(&reftree
);
1731 mutex_exit(&vd
->vdev_dtl_lock
);
1735 vdev_dtl_load(vdev_t
*vd
)
1737 spa_t
*spa
= vd
->vdev_spa
;
1738 space_map_obj_t
*smo
= &vd
->vdev_dtl_smo
;
1739 objset_t
*mos
= spa
->spa_meta_objset
;
1743 ASSERT(vd
->vdev_children
== 0);
1745 if (smo
->smo_object
== 0)
1748 ASSERT(!vd
->vdev_ishole
);
1750 if ((error
= dmu_bonus_hold(mos
, smo
->smo_object
, FTAG
, &db
)) != 0)
1753 ASSERT3U(db
->db_size
, >=, sizeof (*smo
));
1754 bcopy(db
->db_data
, smo
, sizeof (*smo
));
1755 dmu_buf_rele(db
, FTAG
);
1757 mutex_enter(&vd
->vdev_dtl_lock
);
1758 error
= space_map_load(&vd
->vdev_dtl
[DTL_MISSING
],
1759 NULL
, SM_ALLOC
, smo
, mos
);
1760 mutex_exit(&vd
->vdev_dtl_lock
);
1766 vdev_dtl_sync(vdev_t
*vd
, uint64_t txg
)
1768 spa_t
*spa
= vd
->vdev_spa
;
1769 space_map_obj_t
*smo
= &vd
->vdev_dtl_smo
;
1770 space_map_t
*sm
= &vd
->vdev_dtl
[DTL_MISSING
];
1771 objset_t
*mos
= spa
->spa_meta_objset
;
1777 ASSERT(!vd
->vdev_ishole
);
1779 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
1781 if (vd
->vdev_detached
) {
1782 if (smo
->smo_object
!= 0) {
1783 int err
= dmu_object_free(mos
, smo
->smo_object
, tx
);
1784 ASSERT3U(err
, ==, 0);
1785 smo
->smo_object
= 0;
1791 if (smo
->smo_object
== 0) {
1792 ASSERT(smo
->smo_objsize
== 0);
1793 ASSERT(smo
->smo_alloc
== 0);
1794 smo
->smo_object
= dmu_object_alloc(mos
,
1795 DMU_OT_SPACE_MAP
, 1 << SPACE_MAP_BLOCKSHIFT
,
1796 DMU_OT_SPACE_MAP_HEADER
, sizeof (*smo
), tx
);
1797 ASSERT(smo
->smo_object
!= 0);
1798 vdev_config_dirty(vd
->vdev_top
);
1801 mutex_init(&smlock
, NULL
, MUTEX_DEFAULT
, NULL
);
1803 space_map_create(&smsync
, sm
->sm_start
, sm
->sm_size
, sm
->sm_shift
,
1806 mutex_enter(&smlock
);
1808 mutex_enter(&vd
->vdev_dtl_lock
);
1809 space_map_walk(sm
, space_map_add
, &smsync
);
1810 mutex_exit(&vd
->vdev_dtl_lock
);
1812 space_map_truncate(smo
, mos
, tx
);
1813 space_map_sync(&smsync
, SM_ALLOC
, smo
, mos
, tx
);
1815 space_map_destroy(&smsync
);
1817 mutex_exit(&smlock
);
1818 mutex_destroy(&smlock
);
1820 VERIFY(0 == dmu_bonus_hold(mos
, smo
->smo_object
, FTAG
, &db
));
1821 dmu_buf_will_dirty(db
, tx
);
1822 ASSERT3U(db
->db_size
, >=, sizeof (*smo
));
1823 bcopy(smo
, db
->db_data
, sizeof (*smo
));
1824 dmu_buf_rele(db
, FTAG
);
1830 * Determine whether the specified vdev can be offlined/detached/removed
1831 * without losing data.
1834 vdev_dtl_required(vdev_t
*vd
)
1836 spa_t
*spa
= vd
->vdev_spa
;
1837 vdev_t
*tvd
= vd
->vdev_top
;
1838 uint8_t cant_read
= vd
->vdev_cant_read
;
1841 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1843 if (vd
== spa
->spa_root_vdev
|| vd
== tvd
)
1847 * Temporarily mark the device as unreadable, and then determine
1848 * whether this results in any DTL outages in the top-level vdev.
1849 * If not, we can safely offline/detach/remove the device.
1851 vd
->vdev_cant_read
= B_TRUE
;
1852 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
1853 required
= !vdev_dtl_empty(tvd
, DTL_OUTAGE
);
1854 vd
->vdev_cant_read
= cant_read
;
1855 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
1857 if (!required
&& zio_injection_enabled
)
1858 required
= !!zio_handle_device_injection(vd
, NULL
, ECHILD
);
1864 * Determine if resilver is needed, and if so the txg range.
1867 vdev_resilver_needed(vdev_t
*vd
, uint64_t *minp
, uint64_t *maxp
)
1869 boolean_t needed
= B_FALSE
;
1870 uint64_t thismin
= UINT64_MAX
;
1871 uint64_t thismax
= 0;
1873 if (vd
->vdev_children
== 0) {
1874 mutex_enter(&vd
->vdev_dtl_lock
);
1875 if (vd
->vdev_dtl
[DTL_MISSING
].sm_space
!= 0 &&
1876 vdev_writeable(vd
)) {
1879 ss
= avl_first(&vd
->vdev_dtl
[DTL_MISSING
].sm_root
);
1880 thismin
= ss
->ss_start
- 1;
1881 ss
= avl_last(&vd
->vdev_dtl
[DTL_MISSING
].sm_root
);
1882 thismax
= ss
->ss_end
;
1885 mutex_exit(&vd
->vdev_dtl_lock
);
1887 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
1888 vdev_t
*cvd
= vd
->vdev_child
[c
];
1889 uint64_t cmin
, cmax
;
1891 if (vdev_resilver_needed(cvd
, &cmin
, &cmax
)) {
1892 thismin
= MIN(thismin
, cmin
);
1893 thismax
= MAX(thismax
, cmax
);
1899 if (needed
&& minp
) {
1907 vdev_load(vdev_t
*vd
)
1910 * Recursively load all children.
1912 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1913 vdev_load(vd
->vdev_child
[c
]);
1916 * If this is a top-level vdev, initialize its metaslabs.
1918 if (vd
== vd
->vdev_top
&& !vd
->vdev_ishole
&&
1919 (vd
->vdev_ashift
== 0 || vd
->vdev_asize
== 0 ||
1920 vdev_metaslab_init(vd
, 0) != 0))
1921 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1922 VDEV_AUX_CORRUPT_DATA
);
1925 * If this is a leaf vdev, load its DTL.
1927 if (vd
->vdev_ops
->vdev_op_leaf
&& vdev_dtl_load(vd
) != 0)
1928 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1929 VDEV_AUX_CORRUPT_DATA
);
1933 * The special vdev case is used for hot spares and l2cache devices. Its
1934 * sole purpose it to set the vdev state for the associated vdev. To do this,
1935 * we make sure that we can open the underlying device, then try to read the
1936 * label, and make sure that the label is sane and that it hasn't been
1937 * repurposed to another pool.
1940 vdev_validate_aux(vdev_t
*vd
)
1943 uint64_t guid
, version
;
1946 if (!vdev_readable(vd
))
1949 if ((label
= vdev_label_read_config(vd
)) == NULL
) {
1950 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1951 VDEV_AUX_CORRUPT_DATA
);
1955 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_VERSION
, &version
) != 0 ||
1956 version
> SPA_VERSION
||
1957 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
, &guid
) != 0 ||
1958 guid
!= vd
->vdev_guid
||
1959 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
, &state
) != 0) {
1960 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1961 VDEV_AUX_CORRUPT_DATA
);
1967 * We don't actually check the pool state here. If it's in fact in
1968 * use by another pool, we update this fact on the fly when requested.
1975 vdev_remove(vdev_t
*vd
, uint64_t txg
)
1977 spa_t
*spa
= vd
->vdev_spa
;
1978 objset_t
*mos
= spa
->spa_meta_objset
;
1981 tx
= dmu_tx_create_assigned(spa_get_dsl(spa
), txg
);
1983 if (vd
->vdev_dtl_smo
.smo_object
) {
1984 ASSERT3U(vd
->vdev_dtl_smo
.smo_alloc
, ==, 0);
1985 (void) dmu_object_free(mos
, vd
->vdev_dtl_smo
.smo_object
, tx
);
1986 vd
->vdev_dtl_smo
.smo_object
= 0;
1989 if (vd
->vdev_ms
!= NULL
) {
1990 for (int m
= 0; m
< vd
->vdev_ms_count
; m
++) {
1991 metaslab_t
*msp
= vd
->vdev_ms
[m
];
1993 if (msp
== NULL
|| msp
->ms_smo
.smo_object
== 0)
1996 ASSERT3U(msp
->ms_smo
.smo_alloc
, ==, 0);
1997 (void) dmu_object_free(mos
, msp
->ms_smo
.smo_object
, tx
);
1998 msp
->ms_smo
.smo_object
= 0;
2002 if (vd
->vdev_ms_array
) {
2003 (void) dmu_object_free(mos
, vd
->vdev_ms_array
, tx
);
2004 vd
->vdev_ms_array
= 0;
2005 vd
->vdev_ms_shift
= 0;
2011 vdev_sync_done(vdev_t
*vd
, uint64_t txg
)
2014 boolean_t reassess
= !txg_list_empty(&vd
->vdev_ms_list
, TXG_CLEAN(txg
));
2016 ASSERT(!vd
->vdev_ishole
);
2018 while (msp
= txg_list_remove(&vd
->vdev_ms_list
, TXG_CLEAN(txg
)))
2019 metaslab_sync_done(msp
, txg
);
2022 metaslab_sync_reassess(vd
->vdev_mg
);
2026 vdev_sync(vdev_t
*vd
, uint64_t txg
)
2028 spa_t
*spa
= vd
->vdev_spa
;
2033 ASSERT(!vd
->vdev_ishole
);
2035 if (vd
->vdev_ms_array
== 0 && vd
->vdev_ms_shift
!= 0) {
2036 ASSERT(vd
== vd
->vdev_top
);
2037 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
2038 vd
->vdev_ms_array
= dmu_object_alloc(spa
->spa_meta_objset
,
2039 DMU_OT_OBJECT_ARRAY
, 0, DMU_OT_NONE
, 0, tx
);
2040 ASSERT(vd
->vdev_ms_array
!= 0);
2041 vdev_config_dirty(vd
);
2046 * Remove the metadata associated with this vdev once it's empty.
2048 if (vd
->vdev_stat
.vs_alloc
== 0 && vd
->vdev_removing
)
2049 vdev_remove(vd
, txg
);
2051 while ((msp
= txg_list_remove(&vd
->vdev_ms_list
, txg
)) != NULL
) {
2052 metaslab_sync(msp
, txg
);
2053 (void) txg_list_add(&vd
->vdev_ms_list
, msp
, TXG_CLEAN(txg
));
2056 while ((lvd
= txg_list_remove(&vd
->vdev_dtl_list
, txg
)) != NULL
)
2057 vdev_dtl_sync(lvd
, txg
);
2059 (void) txg_list_add(&spa
->spa_vdev_txg_list
, vd
, TXG_CLEAN(txg
));
2063 vdev_psize_to_asize(vdev_t
*vd
, uint64_t psize
)
2065 return (vd
->vdev_ops
->vdev_op_asize(vd
, psize
));
2069 * Mark the given vdev faulted. A faulted vdev behaves as if the device could
2070 * not be opened, and no I/O is attempted.
2073 vdev_fault(spa_t
*spa
, uint64_t guid
, vdev_aux_t aux
)
2077 spa_vdev_state_enter(spa
, SCL_NONE
);
2079 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2080 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2082 if (!vd
->vdev_ops
->vdev_op_leaf
)
2083 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2088 * We don't directly use the aux state here, but if we do a
2089 * vdev_reopen(), we need this value to be present to remember why we
2092 vd
->vdev_label_aux
= aux
;
2095 * Faulted state takes precedence over degraded.
2097 vd
->vdev_delayed_close
= B_FALSE
;
2098 vd
->vdev_faulted
= 1ULL;
2099 vd
->vdev_degraded
= 0ULL;
2100 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_FAULTED
, aux
);
2103 * If this device has the only valid copy of the data, then
2104 * back off and simply mark the vdev as degraded instead.
2106 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&& vdev_dtl_required(vd
)) {
2107 vd
->vdev_degraded
= 1ULL;
2108 vd
->vdev_faulted
= 0ULL;
2111 * If we reopen the device and it's not dead, only then do we
2116 if (vdev_readable(vd
))
2117 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
, aux
);
2120 return (spa_vdev_state_exit(spa
, vd
, 0));
2124 * Mark the given vdev degraded. A degraded vdev is purely an indication to the
2125 * user that something is wrong. The vdev continues to operate as normal as far
2126 * as I/O is concerned.
2129 vdev_degrade(spa_t
*spa
, uint64_t guid
, vdev_aux_t aux
)
2133 spa_vdev_state_enter(spa
, SCL_NONE
);
2135 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2136 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2138 if (!vd
->vdev_ops
->vdev_op_leaf
)
2139 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2142 * If the vdev is already faulted, then don't do anything.
2144 if (vd
->vdev_faulted
|| vd
->vdev_degraded
)
2145 return (spa_vdev_state_exit(spa
, NULL
, 0));
2147 vd
->vdev_degraded
= 1ULL;
2148 if (!vdev_is_dead(vd
))
2149 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
,
2152 return (spa_vdev_state_exit(spa
, vd
, 0));
2156 * Online the given vdev. If 'unspare' is set, it implies two things. First,
2157 * any attached spare device should be detached when the device finishes
2158 * resilvering. Second, the online should be treated like a 'test' online case,
2159 * so no FMA events are generated if the device fails to open.
2162 vdev_online(spa_t
*spa
, uint64_t guid
, uint64_t flags
, vdev_state_t
*newstate
)
2164 vdev_t
*vd
, *tvd
, *pvd
, *rvd
= spa
->spa_root_vdev
;
2166 spa_vdev_state_enter(spa
, SCL_NONE
);
2168 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2169 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2171 if (!vd
->vdev_ops
->vdev_op_leaf
)
2172 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2175 vd
->vdev_offline
= B_FALSE
;
2176 vd
->vdev_tmpoffline
= B_FALSE
;
2177 vd
->vdev_checkremove
= !!(flags
& ZFS_ONLINE_CHECKREMOVE
);
2178 vd
->vdev_forcefault
= !!(flags
& ZFS_ONLINE_FORCEFAULT
);
2180 /* XXX - L2ARC 1.0 does not support expansion */
2181 if (!vd
->vdev_aux
) {
2182 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2183 pvd
->vdev_expanding
= !!(flags
& ZFS_ONLINE_EXPAND
);
2187 vd
->vdev_checkremove
= vd
->vdev_forcefault
= B_FALSE
;
2189 if (!vd
->vdev_aux
) {
2190 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2191 pvd
->vdev_expanding
= B_FALSE
;
2195 *newstate
= vd
->vdev_state
;
2196 if ((flags
& ZFS_ONLINE_UNSPARE
) &&
2197 !vdev_is_dead(vd
) && vd
->vdev_parent
&&
2198 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
2199 vd
->vdev_parent
->vdev_child
[0] == vd
)
2200 vd
->vdev_unspare
= B_TRUE
;
2202 if ((flags
& ZFS_ONLINE_EXPAND
) || spa
->spa_autoexpand
) {
2204 /* XXX - L2ARC 1.0 does not support expansion */
2206 return (spa_vdev_state_exit(spa
, vd
, ENOTSUP
));
2207 spa_async_request(spa
, SPA_ASYNC_CONFIG_UPDATE
);
2209 return (spa_vdev_state_exit(spa
, vd
, 0));
2213 vdev_offline_locked(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
2217 uint64_t generation
;
2218 metaslab_group_t
*mg
;
2221 spa_vdev_state_enter(spa
, SCL_ALLOC
);
2223 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2224 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2226 if (!vd
->vdev_ops
->vdev_op_leaf
)
2227 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2231 generation
= spa
->spa_config_generation
+ 1;
2234 * If the device isn't already offline, try to offline it.
2236 if (!vd
->vdev_offline
) {
2238 * If this device has the only valid copy of some data,
2239 * don't allow it to be offlined. Log devices are always
2242 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&&
2243 vdev_dtl_required(vd
))
2244 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
2247 * If the top-level is a slog and it has had allocations
2248 * then proceed. We check that the vdev's metaslab group
2249 * is not NULL since it's possible that we may have just
2250 * added this vdev but not yet initialized its metaslabs.
2252 if (tvd
->vdev_islog
&& mg
!= NULL
) {
2254 * Prevent any future allocations.
2256 metaslab_group_passivate(mg
);
2257 (void) spa_vdev_state_exit(spa
, vd
, 0);
2259 error
= spa_offline_log(spa
);
2261 spa_vdev_state_enter(spa
, SCL_ALLOC
);
2264 * Check to see if the config has changed.
2266 if (error
|| generation
!= spa
->spa_config_generation
) {
2267 metaslab_group_activate(mg
);
2269 return (spa_vdev_state_exit(spa
,
2271 (void) spa_vdev_state_exit(spa
, vd
, 0);
2274 ASSERT3U(tvd
->vdev_stat
.vs_alloc
, ==, 0);
2278 * Offline this device and reopen its top-level vdev.
2279 * If the top-level vdev is a log device then just offline
2280 * it. Otherwise, if this action results in the top-level
2281 * vdev becoming unusable, undo it and fail the request.
2283 vd
->vdev_offline
= B_TRUE
;
2286 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&&
2287 vdev_is_dead(tvd
)) {
2288 vd
->vdev_offline
= B_FALSE
;
2290 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
2294 * Add the device back into the metaslab rotor so that
2295 * once we online the device it's open for business.
2297 if (tvd
->vdev_islog
&& mg
!= NULL
)
2298 metaslab_group_activate(mg
);
2301 vd
->vdev_tmpoffline
= !!(flags
& ZFS_OFFLINE_TEMPORARY
);
2303 return (spa_vdev_state_exit(spa
, vd
, 0));
2307 vdev_offline(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
2311 mutex_enter(&spa
->spa_vdev_top_lock
);
2312 error
= vdev_offline_locked(spa
, guid
, flags
);
2313 mutex_exit(&spa
->spa_vdev_top_lock
);
2319 * Clear the error counts associated with this vdev. Unlike vdev_online() and
2320 * vdev_offline(), we assume the spa config is locked. We also clear all
2321 * children. If 'vd' is NULL, then the user wants to clear all vdevs.
2324 vdev_clear(spa_t
*spa
, vdev_t
*vd
)
2326 vdev_t
*rvd
= spa
->spa_root_vdev
;
2328 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
2333 vd
->vdev_stat
.vs_read_errors
= 0;
2334 vd
->vdev_stat
.vs_write_errors
= 0;
2335 vd
->vdev_stat
.vs_checksum_errors
= 0;
2337 for (int c
= 0; c
< vd
->vdev_children
; c
++)
2338 vdev_clear(spa
, vd
->vdev_child
[c
]);
2341 * If we're in the FAULTED state or have experienced failed I/O, then
2342 * clear the persistent state and attempt to reopen the device. We
2343 * also mark the vdev config dirty, so that the new faulted state is
2344 * written out to disk.
2346 if (vd
->vdev_faulted
|| vd
->vdev_degraded
||
2347 !vdev_readable(vd
) || !vdev_writeable(vd
)) {
2350 * When reopening in reponse to a clear event, it may be due to
2351 * a fmadm repair request. In this case, if the device is
2352 * still broken, we want to still post the ereport again.
2354 vd
->vdev_forcefault
= B_TRUE
;
2356 vd
->vdev_faulted
= vd
->vdev_degraded
= 0ULL;
2357 vd
->vdev_cant_read
= B_FALSE
;
2358 vd
->vdev_cant_write
= B_FALSE
;
2360 vdev_reopen(vd
== rvd
? rvd
: vd
->vdev_top
);
2362 vd
->vdev_forcefault
= B_FALSE
;
2364 if (vd
!= rvd
&& vdev_writeable(vd
->vdev_top
))
2365 vdev_state_dirty(vd
->vdev_top
);
2367 if (vd
->vdev_aux
== NULL
&& !vdev_is_dead(vd
))
2368 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
2370 spa_event_notify(spa
, vd
, ESC_ZFS_VDEV_CLEAR
);
2374 * When clearing a FMA-diagnosed fault, we always want to
2375 * unspare the device, as we assume that the original spare was
2376 * done in response to the FMA fault.
2378 if (!vdev_is_dead(vd
) && vd
->vdev_parent
!= NULL
&&
2379 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
2380 vd
->vdev_parent
->vdev_child
[0] == vd
)
2381 vd
->vdev_unspare
= B_TRUE
;
2385 vdev_is_dead(vdev_t
*vd
)
2388 * Holes and missing devices are always considered "dead".
2389 * This simplifies the code since we don't have to check for
2390 * these types of devices in the various code paths.
2391 * Instead we rely on the fact that we skip over dead devices
2392 * before issuing I/O to them.
2394 return (vd
->vdev_state
< VDEV_STATE_DEGRADED
|| vd
->vdev_ishole
||
2395 vd
->vdev_ops
== &vdev_missing_ops
);
2399 vdev_readable(vdev_t
*vd
)
2401 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_read
);
2405 vdev_writeable(vdev_t
*vd
)
2407 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_write
);
2411 vdev_allocatable(vdev_t
*vd
)
2413 uint64_t state
= vd
->vdev_state
;
2416 * We currently allow allocations from vdevs which may be in the
2417 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
2418 * fails to reopen then we'll catch it later when we're holding
2419 * the proper locks. Note that we have to get the vdev state
2420 * in a local variable because although it changes atomically,
2421 * we're asking two separate questions about it.
2423 return (!(state
< VDEV_STATE_DEGRADED
&& state
!= VDEV_STATE_CLOSED
) &&
2424 !vd
->vdev_cant_write
&& !vd
->vdev_ishole
);
2428 vdev_accessible(vdev_t
*vd
, zio_t
*zio
)
2430 ASSERT(zio
->io_vd
== vd
);
2432 if (vdev_is_dead(vd
) || vd
->vdev_remove_wanted
)
2435 if (zio
->io_type
== ZIO_TYPE_READ
)
2436 return (!vd
->vdev_cant_read
);
2438 if (zio
->io_type
== ZIO_TYPE_WRITE
)
2439 return (!vd
->vdev_cant_write
);
2445 * Get statistics for the given vdev.
2448 vdev_get_stats(vdev_t
*vd
, vdev_stat_t
*vs
)
2450 vdev_t
*rvd
= vd
->vdev_spa
->spa_root_vdev
;
2452 mutex_enter(&vd
->vdev_stat_lock
);
2453 bcopy(&vd
->vdev_stat
, vs
, sizeof (*vs
));
2454 vs
->vs_timestamp
= gethrtime() - vs
->vs_timestamp
;
2455 vs
->vs_state
= vd
->vdev_state
;
2456 vs
->vs_rsize
= vdev_get_min_asize(vd
);
2457 if (vd
->vdev_ops
->vdev_op_leaf
)
2458 vs
->vs_rsize
+= VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
;
2459 mutex_exit(&vd
->vdev_stat_lock
);
2462 * If we're getting stats on the root vdev, aggregate the I/O counts
2463 * over all top-level vdevs (i.e. the direct children of the root).
2466 for (int c
= 0; c
< rvd
->vdev_children
; c
++) {
2467 vdev_t
*cvd
= rvd
->vdev_child
[c
];
2468 vdev_stat_t
*cvs
= &cvd
->vdev_stat
;
2470 mutex_enter(&vd
->vdev_stat_lock
);
2471 for (int t
= 0; t
< ZIO_TYPES
; t
++) {
2472 vs
->vs_ops
[t
] += cvs
->vs_ops
[t
];
2473 vs
->vs_bytes
[t
] += cvs
->vs_bytes
[t
];
2475 cvs
->vs_scan_removing
= cvd
->vdev_removing
;
2476 mutex_exit(&vd
->vdev_stat_lock
);
2482 vdev_clear_stats(vdev_t
*vd
)
2484 mutex_enter(&vd
->vdev_stat_lock
);
2485 vd
->vdev_stat
.vs_space
= 0;
2486 vd
->vdev_stat
.vs_dspace
= 0;
2487 vd
->vdev_stat
.vs_alloc
= 0;
2488 mutex_exit(&vd
->vdev_stat_lock
);
2492 vdev_scan_stat_init(vdev_t
*vd
)
2494 vdev_stat_t
*vs
= &vd
->vdev_stat
;
2496 for (int c
= 0; c
< vd
->vdev_children
; c
++)
2497 vdev_scan_stat_init(vd
->vdev_child
[c
]);
2499 mutex_enter(&vd
->vdev_stat_lock
);
2500 vs
->vs_scan_processed
= 0;
2501 mutex_exit(&vd
->vdev_stat_lock
);
2505 vdev_stat_update(zio_t
*zio
, uint64_t psize
)
2507 spa_t
*spa
= zio
->io_spa
;
2508 vdev_t
*rvd
= spa
->spa_root_vdev
;
2509 vdev_t
*vd
= zio
->io_vd
? zio
->io_vd
: rvd
;
2511 uint64_t txg
= zio
->io_txg
;
2512 vdev_stat_t
*vs
= &vd
->vdev_stat
;
2513 zio_type_t type
= zio
->io_type
;
2514 int flags
= zio
->io_flags
;
2517 * If this i/o is a gang leader, it didn't do any actual work.
2519 if (zio
->io_gang_tree
)
2522 if (zio
->io_error
== 0) {
2524 * If this is a root i/o, don't count it -- we've already
2525 * counted the top-level vdevs, and vdev_get_stats() will
2526 * aggregate them when asked. This reduces contention on
2527 * the root vdev_stat_lock and implicitly handles blocks
2528 * that compress away to holes, for which there is no i/o.
2529 * (Holes never create vdev children, so all the counters
2530 * remain zero, which is what we want.)
2532 * Note: this only applies to successful i/o (io_error == 0)
2533 * because unlike i/o counts, errors are not additive.
2534 * When reading a ditto block, for example, failure of
2535 * one top-level vdev does not imply a root-level error.
2540 ASSERT(vd
== zio
->io_vd
);
2542 if (flags
& ZIO_FLAG_IO_BYPASS
)
2545 mutex_enter(&vd
->vdev_stat_lock
);
2547 if (flags
& ZIO_FLAG_IO_REPAIR
) {
2548 if (flags
& ZIO_FLAG_SCAN_THREAD
) {
2549 dsl_scan_phys_t
*scn_phys
=
2550 &spa
->spa_dsl_pool
->dp_scan
->scn_phys
;
2551 uint64_t *processed
= &scn_phys
->scn_processed
;
2554 if (vd
->vdev_ops
->vdev_op_leaf
)
2555 atomic_add_64(processed
, psize
);
2556 vs
->vs_scan_processed
+= psize
;
2559 if (flags
& ZIO_FLAG_SELF_HEAL
)
2560 vs
->vs_self_healed
+= psize
;
2564 vs
->vs_bytes
[type
] += psize
;
2566 mutex_exit(&vd
->vdev_stat_lock
);
2570 if (flags
& ZIO_FLAG_SPECULATIVE
)
2574 * If this is an I/O error that is going to be retried, then ignore the
2575 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as
2576 * hard errors, when in reality they can happen for any number of
2577 * innocuous reasons (bus resets, MPxIO link failure, etc).
2579 if (zio
->io_error
== EIO
&&
2580 !(zio
->io_flags
& ZIO_FLAG_IO_RETRY
))
2584 * Intent logs writes won't propagate their error to the root
2585 * I/O so don't mark these types of failures as pool-level
2588 if (zio
->io_vd
== NULL
&& (zio
->io_flags
& ZIO_FLAG_DONT_PROPAGATE
))
2591 mutex_enter(&vd
->vdev_stat_lock
);
2592 if (type
== ZIO_TYPE_READ
&& !vdev_is_dead(vd
)) {
2593 if (zio
->io_error
== ECKSUM
)
2594 vs
->vs_checksum_errors
++;
2596 vs
->vs_read_errors
++;
2598 if (type
== ZIO_TYPE_WRITE
&& !vdev_is_dead(vd
))
2599 vs
->vs_write_errors
++;
2600 mutex_exit(&vd
->vdev_stat_lock
);
2602 if (type
== ZIO_TYPE_WRITE
&& txg
!= 0 &&
2603 (!(flags
& ZIO_FLAG_IO_REPAIR
) ||
2604 (flags
& ZIO_FLAG_SCAN_THREAD
) ||
2605 spa
->spa_claiming
)) {
2607 * This is either a normal write (not a repair), or it's
2608 * a repair induced by the scrub thread, or it's a repair
2609 * made by zil_claim() during spa_load() in the first txg.
2610 * In the normal case, we commit the DTL change in the same
2611 * txg as the block was born. In the scrub-induced repair
2612 * case, we know that scrubs run in first-pass syncing context,
2613 * so we commit the DTL change in spa_syncing_txg(spa).
2614 * In the zil_claim() case, we commit in spa_first_txg(spa).
2616 * We currently do not make DTL entries for failed spontaneous
2617 * self-healing writes triggered by normal (non-scrubbing)
2618 * reads, because we have no transactional context in which to
2619 * do so -- and it's not clear that it'd be desirable anyway.
2621 if (vd
->vdev_ops
->vdev_op_leaf
) {
2622 uint64_t commit_txg
= txg
;
2623 if (flags
& ZIO_FLAG_SCAN_THREAD
) {
2624 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
2625 ASSERT(spa_sync_pass(spa
) == 1);
2626 vdev_dtl_dirty(vd
, DTL_SCRUB
, txg
, 1);
2627 commit_txg
= spa_syncing_txg(spa
);
2628 } else if (spa
->spa_claiming
) {
2629 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
2630 commit_txg
= spa_first_txg(spa
);
2632 ASSERT(commit_txg
>= spa_syncing_txg(spa
));
2633 if (vdev_dtl_contains(vd
, DTL_MISSING
, txg
, 1))
2635 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2636 vdev_dtl_dirty(pvd
, DTL_PARTIAL
, txg
, 1);
2637 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, commit_txg
);
2640 vdev_dtl_dirty(vd
, DTL_MISSING
, txg
, 1);
2645 * Update the in-core space usage stats for this vdev, its metaslab class,
2646 * and the root vdev.
2649 vdev_space_update(vdev_t
*vd
, int64_t alloc_delta
, int64_t defer_delta
,
2650 int64_t space_delta
)
2652 int64_t dspace_delta
= space_delta
;
2653 spa_t
*spa
= vd
->vdev_spa
;
2654 vdev_t
*rvd
= spa
->spa_root_vdev
;
2655 metaslab_group_t
*mg
= vd
->vdev_mg
;
2656 metaslab_class_t
*mc
= mg
? mg
->mg_class
: NULL
;
2658 ASSERT(vd
== vd
->vdev_top
);
2661 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
2662 * factor. We must calculate this here and not at the root vdev
2663 * because the root vdev's psize-to-asize is simply the max of its
2664 * childrens', thus not accurate enough for us.
2666 ASSERT((dspace_delta
& (SPA_MINBLOCKSIZE
-1)) == 0);
2667 ASSERT(vd
->vdev_deflate_ratio
!= 0 || vd
->vdev_isl2cache
);
2668 dspace_delta
= (dspace_delta
>> SPA_MINBLOCKSHIFT
) *
2669 vd
->vdev_deflate_ratio
;
2671 mutex_enter(&vd
->vdev_stat_lock
);
2672 vd
->vdev_stat
.vs_alloc
+= alloc_delta
;
2673 vd
->vdev_stat
.vs_space
+= space_delta
;
2674 vd
->vdev_stat
.vs_dspace
+= dspace_delta
;
2675 mutex_exit(&vd
->vdev_stat_lock
);
2677 if (mc
== spa_normal_class(spa
)) {
2678 mutex_enter(&rvd
->vdev_stat_lock
);
2679 rvd
->vdev_stat
.vs_alloc
+= alloc_delta
;
2680 rvd
->vdev_stat
.vs_space
+= space_delta
;
2681 rvd
->vdev_stat
.vs_dspace
+= dspace_delta
;
2682 mutex_exit(&rvd
->vdev_stat_lock
);
2686 ASSERT(rvd
== vd
->vdev_parent
);
2687 ASSERT(vd
->vdev_ms_count
!= 0);
2689 metaslab_class_space_update(mc
,
2690 alloc_delta
, defer_delta
, space_delta
, dspace_delta
);
2695 * Mark a top-level vdev's config as dirty, placing it on the dirty list
2696 * so that it will be written out next time the vdev configuration is synced.
2697 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
2700 vdev_config_dirty(vdev_t
*vd
)
2702 spa_t
*spa
= vd
->vdev_spa
;
2703 vdev_t
*rvd
= spa
->spa_root_vdev
;
2706 ASSERT(spa_writeable(spa
));
2709 * If this is an aux vdev (as with l2cache and spare devices), then we
2710 * update the vdev config manually and set the sync flag.
2712 if (vd
->vdev_aux
!= NULL
) {
2713 spa_aux_vdev_t
*sav
= vd
->vdev_aux
;
2717 for (c
= 0; c
< sav
->sav_count
; c
++) {
2718 if (sav
->sav_vdevs
[c
] == vd
)
2722 if (c
== sav
->sav_count
) {
2724 * We're being removed. There's nothing more to do.
2726 ASSERT(sav
->sav_sync
== B_TRUE
);
2730 sav
->sav_sync
= B_TRUE
;
2732 if (nvlist_lookup_nvlist_array(sav
->sav_config
,
2733 ZPOOL_CONFIG_L2CACHE
, &aux
, &naux
) != 0) {
2734 VERIFY(nvlist_lookup_nvlist_array(sav
->sav_config
,
2735 ZPOOL_CONFIG_SPARES
, &aux
, &naux
) == 0);
2741 * Setting the nvlist in the middle if the array is a little
2742 * sketchy, but it will work.
2744 nvlist_free(aux
[c
]);
2745 aux
[c
] = vdev_config_generate(spa
, vd
, B_TRUE
, 0);
2751 * The dirty list is protected by the SCL_CONFIG lock. The caller
2752 * must either hold SCL_CONFIG as writer, or must be the sync thread
2753 * (which holds SCL_CONFIG as reader). There's only one sync thread,
2754 * so this is sufficient to ensure mutual exclusion.
2756 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
2757 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2758 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
2761 for (c
= 0; c
< rvd
->vdev_children
; c
++)
2762 vdev_config_dirty(rvd
->vdev_child
[c
]);
2764 ASSERT(vd
== vd
->vdev_top
);
2766 if (!list_link_active(&vd
->vdev_config_dirty_node
) &&
2768 list_insert_head(&spa
->spa_config_dirty_list
, vd
);
2773 vdev_config_clean(vdev_t
*vd
)
2775 spa_t
*spa
= vd
->vdev_spa
;
2777 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
2778 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2779 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
2781 ASSERT(list_link_active(&vd
->vdev_config_dirty_node
));
2782 list_remove(&spa
->spa_config_dirty_list
, vd
);
2786 * Mark a top-level vdev's state as dirty, so that the next pass of
2787 * spa_sync() can convert this into vdev_config_dirty(). We distinguish
2788 * the state changes from larger config changes because they require
2789 * much less locking, and are often needed for administrative actions.
2792 vdev_state_dirty(vdev_t
*vd
)
2794 spa_t
*spa
= vd
->vdev_spa
;
2796 ASSERT(spa_writeable(spa
));
2797 ASSERT(vd
== vd
->vdev_top
);
2800 * The state list is protected by the SCL_STATE lock. The caller
2801 * must either hold SCL_STATE as writer, or must be the sync thread
2802 * (which holds SCL_STATE as reader). There's only one sync thread,
2803 * so this is sufficient to ensure mutual exclusion.
2805 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
2806 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2807 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
2809 if (!list_link_active(&vd
->vdev_state_dirty_node
) && !vd
->vdev_ishole
)
2810 list_insert_head(&spa
->spa_state_dirty_list
, vd
);
2814 vdev_state_clean(vdev_t
*vd
)
2816 spa_t
*spa
= vd
->vdev_spa
;
2818 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
2819 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2820 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
2822 ASSERT(list_link_active(&vd
->vdev_state_dirty_node
));
2823 list_remove(&spa
->spa_state_dirty_list
, vd
);
2827 * Propagate vdev state up from children to parent.
2830 vdev_propagate_state(vdev_t
*vd
)
2832 spa_t
*spa
= vd
->vdev_spa
;
2833 vdev_t
*rvd
= spa
->spa_root_vdev
;
2834 int degraded
= 0, faulted
= 0;
2838 if (vd
->vdev_children
> 0) {
2839 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
2840 child
= vd
->vdev_child
[c
];
2843 * Don't factor holes into the decision.
2845 if (child
->vdev_ishole
)
2848 if (!vdev_readable(child
) ||
2849 (!vdev_writeable(child
) && spa_writeable(spa
))) {
2851 * Root special: if there is a top-level log
2852 * device, treat the root vdev as if it were
2855 if (child
->vdev_islog
&& vd
== rvd
)
2859 } else if (child
->vdev_state
<= VDEV_STATE_DEGRADED
) {
2863 if (child
->vdev_stat
.vs_aux
== VDEV_AUX_CORRUPT_DATA
)
2867 vd
->vdev_ops
->vdev_op_state_change(vd
, faulted
, degraded
);
2870 * Root special: if there is a top-level vdev that cannot be
2871 * opened due to corrupted metadata, then propagate the root
2872 * vdev's aux state as 'corrupt' rather than 'insufficient
2875 if (corrupted
&& vd
== rvd
&&
2876 rvd
->vdev_state
== VDEV_STATE_CANT_OPEN
)
2877 vdev_set_state(rvd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2878 VDEV_AUX_CORRUPT_DATA
);
2881 if (vd
->vdev_parent
)
2882 vdev_propagate_state(vd
->vdev_parent
);
2886 * Set a vdev's state. If this is during an open, we don't update the parent
2887 * state, because we're in the process of opening children depth-first.
2888 * Otherwise, we propagate the change to the parent.
2890 * If this routine places a device in a faulted state, an appropriate ereport is
2894 vdev_set_state(vdev_t
*vd
, boolean_t isopen
, vdev_state_t state
, vdev_aux_t aux
)
2896 uint64_t save_state
;
2897 spa_t
*spa
= vd
->vdev_spa
;
2899 if (state
== vd
->vdev_state
) {
2900 vd
->vdev_stat
.vs_aux
= aux
;
2904 save_state
= vd
->vdev_state
;
2906 vd
->vdev_state
= state
;
2907 vd
->vdev_stat
.vs_aux
= aux
;
2910 * If we are setting the vdev state to anything but an open state, then
2911 * always close the underlying device unless the device has requested
2912 * a delayed close (i.e. we're about to remove or fault the device).
2913 * Otherwise, we keep accessible but invalid devices open forever.
2914 * We don't call vdev_close() itself, because that implies some extra
2915 * checks (offline, etc) that we don't want here. This is limited to
2916 * leaf devices, because otherwise closing the device will affect other
2919 if (!vd
->vdev_delayed_close
&& vdev_is_dead(vd
) &&
2920 vd
->vdev_ops
->vdev_op_leaf
)
2921 vd
->vdev_ops
->vdev_op_close(vd
);
2924 * If we have brought this vdev back into service, we need
2925 * to notify fmd so that it can gracefully repair any outstanding
2926 * cases due to a missing device. We do this in all cases, even those
2927 * that probably don't correlate to a repaired fault. This is sure to
2928 * catch all cases, and we let the zfs-retire agent sort it out. If
2929 * this is a transient state it's OK, as the retire agent will
2930 * double-check the state of the vdev before repairing it.
2932 if (state
== VDEV_STATE_HEALTHY
&& vd
->vdev_ops
->vdev_op_leaf
&&
2933 vd
->vdev_prevstate
!= state
)
2934 zfs_post_state_change(spa
, vd
);
2936 if (vd
->vdev_removed
&&
2937 state
== VDEV_STATE_CANT_OPEN
&&
2938 (aux
== VDEV_AUX_OPEN_FAILED
|| vd
->vdev_checkremove
)) {
2940 * If the previous state is set to VDEV_STATE_REMOVED, then this
2941 * device was previously marked removed and someone attempted to
2942 * reopen it. If this failed due to a nonexistent device, then
2943 * keep the device in the REMOVED state. We also let this be if
2944 * it is one of our special test online cases, which is only
2945 * attempting to online the device and shouldn't generate an FMA
2948 vd
->vdev_state
= VDEV_STATE_REMOVED
;
2949 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
2950 } else if (state
== VDEV_STATE_REMOVED
) {
2951 vd
->vdev_removed
= B_TRUE
;
2952 } else if (state
== VDEV_STATE_CANT_OPEN
) {
2954 * If we fail to open a vdev during an import or recovery, we
2955 * mark it as "not available", which signifies that it was
2956 * never there to begin with. Failure to open such a device
2957 * is not considered an error.
2959 if ((spa_load_state(spa
) == SPA_LOAD_IMPORT
||
2960 spa_load_state(spa
) == SPA_LOAD_RECOVER
) &&
2961 vd
->vdev_ops
->vdev_op_leaf
)
2962 vd
->vdev_not_present
= 1;
2965 * Post the appropriate ereport. If the 'prevstate' field is
2966 * set to something other than VDEV_STATE_UNKNOWN, it indicates
2967 * that this is part of a vdev_reopen(). In this case, we don't
2968 * want to post the ereport if the device was already in the
2969 * CANT_OPEN state beforehand.
2971 * If the 'checkremove' flag is set, then this is an attempt to
2972 * online the device in response to an insertion event. If we
2973 * hit this case, then we have detected an insertion event for a
2974 * faulted or offline device that wasn't in the removed state.
2975 * In this scenario, we don't post an ereport because we are
2976 * about to replace the device, or attempt an online with
2977 * vdev_forcefault, which will generate the fault for us.
2979 if ((vd
->vdev_prevstate
!= state
|| vd
->vdev_forcefault
) &&
2980 !vd
->vdev_not_present
&& !vd
->vdev_checkremove
&&
2981 vd
!= spa
->spa_root_vdev
) {
2985 case VDEV_AUX_OPEN_FAILED
:
2986 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED
;
2988 case VDEV_AUX_CORRUPT_DATA
:
2989 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA
;
2991 case VDEV_AUX_NO_REPLICAS
:
2992 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS
;
2994 case VDEV_AUX_BAD_GUID_SUM
:
2995 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM
;
2997 case VDEV_AUX_TOO_SMALL
:
2998 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL
;
3000 case VDEV_AUX_BAD_LABEL
:
3001 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL
;
3004 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN
;
3007 zfs_ereport_post(class, spa
, vd
, NULL
, save_state
, 0);
3010 /* Erase any notion of persistent removed state */
3011 vd
->vdev_removed
= B_FALSE
;
3013 vd
->vdev_removed
= B_FALSE
;
3016 if (!isopen
&& vd
->vdev_parent
)
3017 vdev_propagate_state(vd
->vdev_parent
);
3021 * Check the vdev configuration to ensure that it's capable of supporting
3022 * a root pool. Currently, we do not support RAID-Z or partial configuration.
3023 * In addition, only a single top-level vdev is allowed and none of the leaves
3024 * can be wholedisks.
3027 vdev_is_bootable(vdev_t
*vd
)
3029 if (!vd
->vdev_ops
->vdev_op_leaf
) {
3030 char *vdev_type
= vd
->vdev_ops
->vdev_op_type
;
3032 if (strcmp(vdev_type
, VDEV_TYPE_ROOT
) == 0 &&
3033 vd
->vdev_children
> 1) {
3035 } else if (strcmp(vdev_type
, VDEV_TYPE_RAIDZ
) == 0 ||
3036 strcmp(vdev_type
, VDEV_TYPE_MISSING
) == 0) {
3039 } else if (vd
->vdev_wholedisk
== 1) {
3043 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
3044 if (!vdev_is_bootable(vd
->vdev_child
[c
]))
3051 * Load the state from the original vdev tree (ovd) which
3052 * we've retrieved from the MOS config object. If the original
3053 * vdev was offline or faulted then we transfer that state to the
3054 * device in the current vdev tree (nvd).
3057 vdev_load_log_state(vdev_t
*nvd
, vdev_t
*ovd
)
3059 spa_t
*spa
= nvd
->vdev_spa
;
3061 ASSERT(nvd
->vdev_top
->vdev_islog
);
3062 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
3063 ASSERT3U(nvd
->vdev_guid
, ==, ovd
->vdev_guid
);
3065 for (int c
= 0; c
< nvd
->vdev_children
; c
++)
3066 vdev_load_log_state(nvd
->vdev_child
[c
], ovd
->vdev_child
[c
]);
3068 if (nvd
->vdev_ops
->vdev_op_leaf
) {
3070 * Restore the persistent vdev state
3072 nvd
->vdev_offline
= ovd
->vdev_offline
;
3073 nvd
->vdev_faulted
= ovd
->vdev_faulted
;
3074 nvd
->vdev_degraded
= ovd
->vdev_degraded
;
3075 nvd
->vdev_removed
= ovd
->vdev_removed
;
3080 * Determine if a log device has valid content. If the vdev was
3081 * removed or faulted in the MOS config then we know that
3082 * the content on the log device has already been written to the pool.
3085 vdev_log_state_valid(vdev_t
*vd
)
3087 if (vd
->vdev_ops
->vdev_op_leaf
&& !vd
->vdev_faulted
&&
3091 for (int c
= 0; c
< vd
->vdev_children
; c
++)
3092 if (vdev_log_state_valid(vd
->vdev_child
[c
]))
3099 * Expand a vdev if possible.
3102 vdev_expand(vdev_t
*vd
, uint64_t txg
)
3104 ASSERT(vd
->vdev_top
== vd
);
3105 ASSERT(spa_config_held(vd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
3107 if ((vd
->vdev_asize
>> vd
->vdev_ms_shift
) > vd
->vdev_ms_count
) {
3108 VERIFY(vdev_metaslab_init(vd
, txg
) == 0);
3109 vdev_config_dirty(vd
);
3117 vdev_split(vdev_t
*vd
)
3119 vdev_t
*cvd
, *pvd
= vd
->vdev_parent
;
3121 vdev_remove_child(pvd
, vd
);
3122 vdev_compact_children(pvd
);
3124 cvd
= pvd
->vdev_child
[0];
3125 if (pvd
->vdev_children
== 1) {
3126 vdev_remove_parent(cvd
);
3127 cvd
->vdev_splitting
= B_TRUE
;
3129 vdev_propagate_state(cvd
);