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
);
90 for (c
= 0; c
< vd
->vdev_children
; c
++) {
91 csize
= vdev_psize_to_asize(vd
->vdev_child
[c
], psize
);
92 asize
= MAX(asize
, csize
);
99 * Get the minimum allocatable size. We define the allocatable size as
100 * the vdev's asize rounded to the nearest metaslab. This allows us to
101 * replace or attach devices which don't have the same physical size but
102 * can still satisfy the same number of allocations.
105 vdev_get_min_asize(vdev_t
*vd
)
107 vdev_t
*pvd
= vd
->vdev_parent
;
110 * The our parent is NULL (inactive spare or cache) or is the root,
111 * just return our own asize.
114 return (vd
->vdev_asize
);
117 * The top-level vdev just returns the allocatable size rounded
118 * to the nearest metaslab.
120 if (vd
== vd
->vdev_top
)
121 return (P2ALIGN(vd
->vdev_asize
, 1ULL << vd
->vdev_ms_shift
));
124 * The allocatable space for a raidz vdev is N * sizeof(smallest child),
125 * so each child must provide at least 1/Nth of its asize.
127 if (pvd
->vdev_ops
== &vdev_raidz_ops
)
128 return (pvd
->vdev_min_asize
/ pvd
->vdev_children
);
130 return (pvd
->vdev_min_asize
);
134 vdev_set_min_asize(vdev_t
*vd
)
137 vd
->vdev_min_asize
= vdev_get_min_asize(vd
);
139 for (c
= 0; c
< vd
->vdev_children
; c
++)
140 vdev_set_min_asize(vd
->vdev_child
[c
]);
144 vdev_lookup_top(spa_t
*spa
, uint64_t vdev
)
146 vdev_t
*rvd
= spa
->spa_root_vdev
;
148 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
150 if (vdev
< rvd
->vdev_children
) {
151 ASSERT(rvd
->vdev_child
[vdev
] != NULL
);
152 return (rvd
->vdev_child
[vdev
]);
159 vdev_lookup_by_guid(vdev_t
*vd
, uint64_t guid
)
164 if (vd
->vdev_guid
== guid
)
167 for (c
= 0; c
< vd
->vdev_children
; c
++)
168 if ((mvd
= vdev_lookup_by_guid(vd
->vdev_child
[c
], guid
)) !=
176 vdev_add_child(vdev_t
*pvd
, vdev_t
*cvd
)
178 size_t oldsize
, newsize
;
179 uint64_t id
= cvd
->vdev_id
;
182 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
183 ASSERT(cvd
->vdev_parent
== NULL
);
185 cvd
->vdev_parent
= pvd
;
190 ASSERT(id
>= pvd
->vdev_children
|| pvd
->vdev_child
[id
] == NULL
);
192 oldsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
193 pvd
->vdev_children
= MAX(pvd
->vdev_children
, id
+ 1);
194 newsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
196 newchild
= kmem_zalloc(newsize
, KM_SLEEP
);
197 if (pvd
->vdev_child
!= NULL
) {
198 bcopy(pvd
->vdev_child
, newchild
, oldsize
);
199 kmem_free(pvd
->vdev_child
, oldsize
);
202 pvd
->vdev_child
= newchild
;
203 pvd
->vdev_child
[id
] = cvd
;
205 cvd
->vdev_top
= (pvd
->vdev_top
? pvd
->vdev_top
: cvd
);
206 ASSERT(cvd
->vdev_top
->vdev_parent
->vdev_parent
== NULL
);
209 * Walk up all ancestors to update guid sum.
211 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
212 pvd
->vdev_guid_sum
+= cvd
->vdev_guid_sum
;
216 vdev_remove_child(vdev_t
*pvd
, vdev_t
*cvd
)
219 uint_t id
= cvd
->vdev_id
;
221 ASSERT(cvd
->vdev_parent
== pvd
);
226 ASSERT(id
< pvd
->vdev_children
);
227 ASSERT(pvd
->vdev_child
[id
] == cvd
);
229 pvd
->vdev_child
[id
] = NULL
;
230 cvd
->vdev_parent
= NULL
;
232 for (c
= 0; c
< pvd
->vdev_children
; c
++)
233 if (pvd
->vdev_child
[c
])
236 if (c
== pvd
->vdev_children
) {
237 kmem_free(pvd
->vdev_child
, c
* sizeof (vdev_t
*));
238 pvd
->vdev_child
= NULL
;
239 pvd
->vdev_children
= 0;
243 * Walk up all ancestors to update guid sum.
245 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
246 pvd
->vdev_guid_sum
-= cvd
->vdev_guid_sum
;
250 * Remove any holes in the child array.
253 vdev_compact_children(vdev_t
*pvd
)
255 vdev_t
**newchild
, *cvd
;
256 int oldc
= pvd
->vdev_children
;
260 ASSERT(spa_config_held(pvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
262 for (c
= newc
= 0; c
< oldc
; c
++)
263 if (pvd
->vdev_child
[c
])
266 newchild
= kmem_alloc(newc
* sizeof (vdev_t
*), KM_SLEEP
);
268 for (c
= newc
= 0; c
< oldc
; c
++) {
269 if ((cvd
= pvd
->vdev_child
[c
]) != NULL
) {
270 newchild
[newc
] = cvd
;
271 cvd
->vdev_id
= newc
++;
275 kmem_free(pvd
->vdev_child
, oldc
* sizeof (vdev_t
*));
276 pvd
->vdev_child
= newchild
;
277 pvd
->vdev_children
= newc
;
281 * Allocate and minimally initialize a vdev_t.
284 vdev_alloc_common(spa_t
*spa
, uint_t id
, uint64_t guid
, vdev_ops_t
*ops
)
289 vd
= kmem_zalloc(sizeof (vdev_t
), KM_SLEEP
);
291 if (spa
->spa_root_vdev
== NULL
) {
292 ASSERT(ops
== &vdev_root_ops
);
293 spa
->spa_root_vdev
= vd
;
296 if (guid
== 0 && ops
!= &vdev_hole_ops
) {
297 if (spa
->spa_root_vdev
== vd
) {
299 * The root vdev's guid will also be the pool guid,
300 * which must be unique among all pools.
302 guid
= spa_generate_guid(NULL
);
305 * Any other vdev's guid must be unique within the pool.
307 guid
= spa_generate_guid(spa
);
309 ASSERT(!spa_guid_exists(spa_guid(spa
), guid
));
314 vd
->vdev_guid
= guid
;
315 vd
->vdev_guid_sum
= guid
;
317 vd
->vdev_state
= VDEV_STATE_CLOSED
;
318 vd
->vdev_ishole
= (ops
== &vdev_hole_ops
);
320 list_link_init(&vd
->vdev_config_dirty_node
);
321 list_link_init(&vd
->vdev_state_dirty_node
);
322 mutex_init(&vd
->vdev_dtl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
323 mutex_init(&vd
->vdev_stat_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
324 mutex_init(&vd
->vdev_probe_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
325 for (t
= 0; t
< DTL_TYPES
; t
++) {
326 space_map_create(&vd
->vdev_dtl
[t
], 0, -1ULL, 0,
329 txg_list_create(&vd
->vdev_ms_list
,
330 offsetof(struct metaslab
, ms_txg_node
));
331 txg_list_create(&vd
->vdev_dtl_list
,
332 offsetof(struct vdev
, vdev_dtl_node
));
333 vd
->vdev_stat
.vs_timestamp
= gethrtime();
341 * Allocate a new vdev. The 'alloctype' is used to control whether we are
342 * creating a new vdev or loading an existing one - the behavior is slightly
343 * different for each case.
346 vdev_alloc(spa_t
*spa
, vdev_t
**vdp
, nvlist_t
*nv
, vdev_t
*parent
, uint_t id
,
351 uint64_t guid
= 0, islog
, nparity
;
354 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
356 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_TYPE
, &type
) != 0)
359 if ((ops
= vdev_getops(type
)) == NULL
)
363 * If this is a load, get the vdev guid from the nvlist.
364 * Otherwise, vdev_alloc_common() will generate one for us.
366 if (alloctype
== VDEV_ALLOC_LOAD
) {
369 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ID
, &label_id
) ||
373 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
375 } else if (alloctype
== VDEV_ALLOC_SPARE
) {
376 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
378 } else if (alloctype
== VDEV_ALLOC_L2CACHE
) {
379 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
381 } else if (alloctype
== VDEV_ALLOC_ROOTPOOL
) {
382 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
387 * The first allocated vdev must be of type 'root'.
389 if (ops
!= &vdev_root_ops
&& spa
->spa_root_vdev
== NULL
)
393 * Determine whether we're a log vdev.
396 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_LOG
, &islog
);
397 if (islog
&& spa_version(spa
) < SPA_VERSION_SLOGS
)
400 if (ops
== &vdev_hole_ops
&& spa_version(spa
) < SPA_VERSION_HOLES
)
404 * Set the nparity property for RAID-Z vdevs.
407 if (ops
== &vdev_raidz_ops
) {
408 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NPARITY
,
410 if (nparity
== 0 || nparity
> VDEV_RAIDZ_MAXPARITY
)
413 * Previous versions could only support 1 or 2 parity
417 spa_version(spa
) < SPA_VERSION_RAIDZ2
)
420 spa_version(spa
) < SPA_VERSION_RAIDZ3
)
424 * We require the parity to be specified for SPAs that
425 * support multiple parity levels.
427 if (spa_version(spa
) >= SPA_VERSION_RAIDZ2
)
430 * Otherwise, we default to 1 parity device for RAID-Z.
437 ASSERT(nparity
!= -1ULL);
439 vd
= vdev_alloc_common(spa
, id
, guid
, ops
);
441 vd
->vdev_islog
= islog
;
442 vd
->vdev_nparity
= nparity
;
444 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PATH
, &vd
->vdev_path
) == 0)
445 vd
->vdev_path
= spa_strdup(vd
->vdev_path
);
446 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_DEVID
, &vd
->vdev_devid
) == 0)
447 vd
->vdev_devid
= spa_strdup(vd
->vdev_devid
);
448 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PHYS_PATH
,
449 &vd
->vdev_physpath
) == 0)
450 vd
->vdev_physpath
= spa_strdup(vd
->vdev_physpath
);
451 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_FRU
, &vd
->vdev_fru
) == 0)
452 vd
->vdev_fru
= spa_strdup(vd
->vdev_fru
);
455 * Set the whole_disk property. If it's not specified, leave the value
458 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_WHOLE_DISK
,
459 &vd
->vdev_wholedisk
) != 0)
460 vd
->vdev_wholedisk
= -1ULL;
463 * Look for the 'not present' flag. This will only be set if the device
464 * was not present at the time of import.
466 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NOT_PRESENT
,
467 &vd
->vdev_not_present
);
470 * Get the alignment requirement.
472 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASHIFT
, &vd
->vdev_ashift
);
475 * Retrieve the vdev creation time.
477 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_CREATE_TXG
,
481 * If we're a top-level vdev, try to load the allocation parameters.
483 if (parent
&& !parent
->vdev_parent
&&
484 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_SPLIT
)) {
485 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_ARRAY
,
487 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_SHIFT
,
489 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASIZE
,
491 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVING
,
495 if (parent
&& !parent
->vdev_parent
) {
496 ASSERT(alloctype
== VDEV_ALLOC_LOAD
||
497 alloctype
== VDEV_ALLOC_ADD
||
498 alloctype
== VDEV_ALLOC_SPLIT
||
499 alloctype
== VDEV_ALLOC_ROOTPOOL
);
500 vd
->vdev_mg
= metaslab_group_create(islog
?
501 spa_log_class(spa
) : spa_normal_class(spa
), vd
);
505 * If we're a leaf vdev, try to load the DTL object and other state.
507 if (vd
->vdev_ops
->vdev_op_leaf
&&
508 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_L2CACHE
||
509 alloctype
== VDEV_ALLOC_ROOTPOOL
)) {
510 if (alloctype
== VDEV_ALLOC_LOAD
) {
511 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DTL
,
512 &vd
->vdev_dtl_smo
.smo_object
);
513 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_UNSPARE
,
517 if (alloctype
== VDEV_ALLOC_ROOTPOOL
) {
520 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_SPARE
,
521 &spare
) == 0 && spare
)
525 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_OFFLINE
,
528 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_RESILVERING
,
529 &vd
->vdev_resilvering
);
532 * When importing a pool, we want to ignore the persistent fault
533 * state, as the diagnosis made on another system may not be
534 * valid in the current context. Local vdevs will
535 * remain in the faulted state.
537 if (spa_load_state(spa
) == SPA_LOAD_OPEN
) {
538 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_FAULTED
,
540 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DEGRADED
,
542 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVED
,
545 if (vd
->vdev_faulted
|| vd
->vdev_degraded
) {
549 VDEV_AUX_ERR_EXCEEDED
;
550 if (nvlist_lookup_string(nv
,
551 ZPOOL_CONFIG_AUX_STATE
, &aux
) == 0 &&
552 strcmp(aux
, "external") == 0)
553 vd
->vdev_label_aux
= VDEV_AUX_EXTERNAL
;
559 * Add ourselves to the parent's list of children.
561 vdev_add_child(parent
, vd
);
569 vdev_free(vdev_t
*vd
)
572 spa_t
*spa
= vd
->vdev_spa
;
575 * vdev_free() implies closing the vdev first. This is simpler than
576 * trying to ensure complicated semantics for all callers.
580 ASSERT(!list_link_active(&vd
->vdev_config_dirty_node
));
581 ASSERT(!list_link_active(&vd
->vdev_state_dirty_node
));
586 for (c
= 0; c
< vd
->vdev_children
; c
++)
587 vdev_free(vd
->vdev_child
[c
]);
589 ASSERT(vd
->vdev_child
== NULL
);
590 ASSERT(vd
->vdev_guid_sum
== vd
->vdev_guid
);
593 * Discard allocation state.
595 if (vd
->vdev_mg
!= NULL
) {
596 vdev_metaslab_fini(vd
);
597 metaslab_group_destroy(vd
->vdev_mg
);
600 ASSERT3U(vd
->vdev_stat
.vs_space
, ==, 0);
601 ASSERT3U(vd
->vdev_stat
.vs_dspace
, ==, 0);
602 ASSERT3U(vd
->vdev_stat
.vs_alloc
, ==, 0);
605 * Remove this vdev from its parent's child list.
607 vdev_remove_child(vd
->vdev_parent
, vd
);
609 ASSERT(vd
->vdev_parent
== NULL
);
612 * Clean up vdev structure.
618 spa_strfree(vd
->vdev_path
);
620 spa_strfree(vd
->vdev_devid
);
621 if (vd
->vdev_physpath
)
622 spa_strfree(vd
->vdev_physpath
);
624 spa_strfree(vd
->vdev_fru
);
626 if (vd
->vdev_isspare
)
627 spa_spare_remove(vd
);
628 if (vd
->vdev_isl2cache
)
629 spa_l2cache_remove(vd
);
631 txg_list_destroy(&vd
->vdev_ms_list
);
632 txg_list_destroy(&vd
->vdev_dtl_list
);
634 mutex_enter(&vd
->vdev_dtl_lock
);
635 for (t
= 0; t
< DTL_TYPES
; t
++) {
636 space_map_unload(&vd
->vdev_dtl
[t
]);
637 space_map_destroy(&vd
->vdev_dtl
[t
]);
639 mutex_exit(&vd
->vdev_dtl_lock
);
641 mutex_destroy(&vd
->vdev_dtl_lock
);
642 mutex_destroy(&vd
->vdev_stat_lock
);
643 mutex_destroy(&vd
->vdev_probe_lock
);
645 if (vd
== spa
->spa_root_vdev
)
646 spa
->spa_root_vdev
= NULL
;
648 kmem_free(vd
, sizeof (vdev_t
));
652 * Transfer top-level vdev state from svd to tvd.
655 vdev_top_transfer(vdev_t
*svd
, vdev_t
*tvd
)
657 spa_t
*spa
= svd
->vdev_spa
;
662 ASSERT(tvd
== tvd
->vdev_top
);
664 tvd
->vdev_ms_array
= svd
->vdev_ms_array
;
665 tvd
->vdev_ms_shift
= svd
->vdev_ms_shift
;
666 tvd
->vdev_ms_count
= svd
->vdev_ms_count
;
668 svd
->vdev_ms_array
= 0;
669 svd
->vdev_ms_shift
= 0;
670 svd
->vdev_ms_count
= 0;
672 tvd
->vdev_mg
= svd
->vdev_mg
;
673 tvd
->vdev_ms
= svd
->vdev_ms
;
678 if (tvd
->vdev_mg
!= NULL
)
679 tvd
->vdev_mg
->mg_vd
= tvd
;
681 tvd
->vdev_stat
.vs_alloc
= svd
->vdev_stat
.vs_alloc
;
682 tvd
->vdev_stat
.vs_space
= svd
->vdev_stat
.vs_space
;
683 tvd
->vdev_stat
.vs_dspace
= svd
->vdev_stat
.vs_dspace
;
685 svd
->vdev_stat
.vs_alloc
= 0;
686 svd
->vdev_stat
.vs_space
= 0;
687 svd
->vdev_stat
.vs_dspace
= 0;
689 for (t
= 0; t
< TXG_SIZE
; t
++) {
690 while ((msp
= txg_list_remove(&svd
->vdev_ms_list
, t
)) != NULL
)
691 (void) txg_list_add(&tvd
->vdev_ms_list
, msp
, t
);
692 while ((vd
= txg_list_remove(&svd
->vdev_dtl_list
, t
)) != NULL
)
693 (void) txg_list_add(&tvd
->vdev_dtl_list
, vd
, t
);
694 if (txg_list_remove_this(&spa
->spa_vdev_txg_list
, svd
, t
))
695 (void) txg_list_add(&spa
->spa_vdev_txg_list
, tvd
, t
);
698 if (list_link_active(&svd
->vdev_config_dirty_node
)) {
699 vdev_config_clean(svd
);
700 vdev_config_dirty(tvd
);
703 if (list_link_active(&svd
->vdev_state_dirty_node
)) {
704 vdev_state_clean(svd
);
705 vdev_state_dirty(tvd
);
708 tvd
->vdev_deflate_ratio
= svd
->vdev_deflate_ratio
;
709 svd
->vdev_deflate_ratio
= 0;
711 tvd
->vdev_islog
= svd
->vdev_islog
;
716 vdev_top_update(vdev_t
*tvd
, vdev_t
*vd
)
725 for (c
= 0; c
< vd
->vdev_children
; c
++)
726 vdev_top_update(tvd
, vd
->vdev_child
[c
]);
730 * Add a mirror/replacing vdev above an existing vdev.
733 vdev_add_parent(vdev_t
*cvd
, vdev_ops_t
*ops
)
735 spa_t
*spa
= cvd
->vdev_spa
;
736 vdev_t
*pvd
= cvd
->vdev_parent
;
739 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
741 mvd
= vdev_alloc_common(spa
, cvd
->vdev_id
, 0, ops
);
743 mvd
->vdev_asize
= cvd
->vdev_asize
;
744 mvd
->vdev_min_asize
= cvd
->vdev_min_asize
;
745 mvd
->vdev_ashift
= cvd
->vdev_ashift
;
746 mvd
->vdev_state
= cvd
->vdev_state
;
747 mvd
->vdev_crtxg
= cvd
->vdev_crtxg
;
749 vdev_remove_child(pvd
, cvd
);
750 vdev_add_child(pvd
, mvd
);
751 cvd
->vdev_id
= mvd
->vdev_children
;
752 vdev_add_child(mvd
, cvd
);
753 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
755 if (mvd
== mvd
->vdev_top
)
756 vdev_top_transfer(cvd
, mvd
);
762 * Remove a 1-way mirror/replacing vdev from the tree.
765 vdev_remove_parent(vdev_t
*cvd
)
767 vdev_t
*mvd
= cvd
->vdev_parent
;
768 vdev_t
*pvd
= mvd
->vdev_parent
;
770 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
772 ASSERT(mvd
->vdev_children
== 1);
773 ASSERT(mvd
->vdev_ops
== &vdev_mirror_ops
||
774 mvd
->vdev_ops
== &vdev_replacing_ops
||
775 mvd
->vdev_ops
== &vdev_spare_ops
);
776 cvd
->vdev_ashift
= mvd
->vdev_ashift
;
778 vdev_remove_child(mvd
, cvd
);
779 vdev_remove_child(pvd
, mvd
);
782 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
783 * Otherwise, we could have detached an offline device, and when we
784 * go to import the pool we'll think we have two top-level vdevs,
785 * instead of a different version of the same top-level vdev.
787 if (mvd
->vdev_top
== mvd
) {
788 uint64_t guid_delta
= mvd
->vdev_guid
- cvd
->vdev_guid
;
789 cvd
->vdev_orig_guid
= cvd
->vdev_guid
;
790 cvd
->vdev_guid
+= guid_delta
;
791 cvd
->vdev_guid_sum
+= guid_delta
;
793 cvd
->vdev_id
= mvd
->vdev_id
;
794 vdev_add_child(pvd
, cvd
);
795 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
797 if (cvd
== cvd
->vdev_top
)
798 vdev_top_transfer(mvd
, cvd
);
800 ASSERT(mvd
->vdev_children
== 0);
805 vdev_metaslab_init(vdev_t
*vd
, uint64_t txg
)
807 spa_t
*spa
= vd
->vdev_spa
;
808 objset_t
*mos
= spa
->spa_meta_objset
;
810 uint64_t oldc
= vd
->vdev_ms_count
;
811 uint64_t newc
= vd
->vdev_asize
>> vd
->vdev_ms_shift
;
815 ASSERT(txg
== 0 || spa_config_held(spa
, SCL_ALLOC
, RW_WRITER
));
818 * This vdev is not being allocated from yet or is a hole.
820 if (vd
->vdev_ms_shift
== 0)
823 ASSERT(!vd
->vdev_ishole
);
826 * Compute the raidz-deflation ratio. Note, we hard-code
827 * in 128k (1 << 17) because it is the current "typical" blocksize.
828 * Even if SPA_MAXBLOCKSIZE changes, this algorithm must never change,
829 * or we will inconsistently account for existing bp's.
831 vd
->vdev_deflate_ratio
= (1 << 17) /
832 (vdev_psize_to_asize(vd
, 1 << 17) >> SPA_MINBLOCKSHIFT
);
834 ASSERT(oldc
<= newc
);
836 mspp
= kmem_zalloc(newc
* sizeof (*mspp
), KM_SLEEP
);
839 bcopy(vd
->vdev_ms
, mspp
, oldc
* sizeof (*mspp
));
840 kmem_free(vd
->vdev_ms
, oldc
* sizeof (*mspp
));
844 vd
->vdev_ms_count
= newc
;
846 for (m
= oldc
; m
< newc
; m
++) {
847 space_map_obj_t smo
= { 0, 0, 0 };
850 error
= dmu_read(mos
, vd
->vdev_ms_array
,
851 m
* sizeof (uint64_t), sizeof (uint64_t), &object
,
857 error
= dmu_bonus_hold(mos
, object
, FTAG
, &db
);
860 ASSERT3U(db
->db_size
, >=, sizeof (smo
));
861 bcopy(db
->db_data
, &smo
, sizeof (smo
));
862 ASSERT3U(smo
.smo_object
, ==, object
);
863 dmu_buf_rele(db
, FTAG
);
866 vd
->vdev_ms
[m
] = metaslab_init(vd
->vdev_mg
, &smo
,
867 m
<< vd
->vdev_ms_shift
, 1ULL << vd
->vdev_ms_shift
, txg
);
871 spa_config_enter(spa
, SCL_ALLOC
, FTAG
, RW_WRITER
);
874 * If the vdev is being removed we don't activate
875 * the metaslabs since we want to ensure that no new
876 * allocations are performed on this device.
878 if (oldc
== 0 && !vd
->vdev_removing
)
879 metaslab_group_activate(vd
->vdev_mg
);
882 spa_config_exit(spa
, SCL_ALLOC
, FTAG
);
888 vdev_metaslab_fini(vdev_t
*vd
)
891 uint64_t count
= vd
->vdev_ms_count
;
893 if (vd
->vdev_ms
!= NULL
) {
894 metaslab_group_passivate(vd
->vdev_mg
);
895 for (m
= 0; m
< count
; m
++)
896 if (vd
->vdev_ms
[m
] != NULL
)
897 metaslab_fini(vd
->vdev_ms
[m
]);
898 kmem_free(vd
->vdev_ms
, count
* sizeof (metaslab_t
*));
903 typedef struct vdev_probe_stats
{
904 boolean_t vps_readable
;
905 boolean_t vps_writeable
;
907 } vdev_probe_stats_t
;
910 vdev_probe_done(zio_t
*zio
)
912 spa_t
*spa
= zio
->io_spa
;
913 vdev_t
*vd
= zio
->io_vd
;
914 vdev_probe_stats_t
*vps
= zio
->io_private
;
916 ASSERT(vd
->vdev_probe_zio
!= NULL
);
918 if (zio
->io_type
== ZIO_TYPE_READ
) {
919 if (zio
->io_error
== 0)
920 vps
->vps_readable
= 1;
921 if (zio
->io_error
== 0 && spa_writeable(spa
)) {
922 zio_nowait(zio_write_phys(vd
->vdev_probe_zio
, vd
,
923 zio
->io_offset
, zio
->io_size
, zio
->io_data
,
924 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
925 ZIO_PRIORITY_SYNC_WRITE
, vps
->vps_flags
, B_TRUE
));
927 zio_buf_free(zio
->io_data
, zio
->io_size
);
929 } else if (zio
->io_type
== ZIO_TYPE_WRITE
) {
930 if (zio
->io_error
== 0)
931 vps
->vps_writeable
= 1;
932 zio_buf_free(zio
->io_data
, zio
->io_size
);
933 } else if (zio
->io_type
== ZIO_TYPE_NULL
) {
936 vd
->vdev_cant_read
|= !vps
->vps_readable
;
937 vd
->vdev_cant_write
|= !vps
->vps_writeable
;
939 if (vdev_readable(vd
) &&
940 (vdev_writeable(vd
) || !spa_writeable(spa
))) {
943 ASSERT(zio
->io_error
!= 0);
944 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE
,
945 spa
, vd
, NULL
, 0, 0);
946 zio
->io_error
= ENXIO
;
949 mutex_enter(&vd
->vdev_probe_lock
);
950 ASSERT(vd
->vdev_probe_zio
== zio
);
951 vd
->vdev_probe_zio
= NULL
;
952 mutex_exit(&vd
->vdev_probe_lock
);
954 while ((pio
= zio_walk_parents(zio
)) != NULL
)
955 if (!vdev_accessible(vd
, pio
))
956 pio
->io_error
= ENXIO
;
958 kmem_free(vps
, sizeof (*vps
));
963 * Determine whether this device is accessible by reading and writing
964 * to several known locations: the pad regions of each vdev label
965 * but the first (which we leave alone in case it contains a VTOC).
968 vdev_probe(vdev_t
*vd
, zio_t
*zio
)
970 spa_t
*spa
= vd
->vdev_spa
;
971 vdev_probe_stats_t
*vps
= NULL
;
975 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
978 * Don't probe the probe.
980 if (zio
&& (zio
->io_flags
& ZIO_FLAG_PROBE
))
984 * To prevent 'probe storms' when a device fails, we create
985 * just one probe i/o at a time. All zios that want to probe
986 * this vdev will become parents of the probe io.
988 mutex_enter(&vd
->vdev_probe_lock
);
990 if ((pio
= vd
->vdev_probe_zio
) == NULL
) {
991 vps
= kmem_zalloc(sizeof (*vps
), KM_SLEEP
);
993 vps
->vps_flags
= ZIO_FLAG_CANFAIL
| ZIO_FLAG_PROBE
|
994 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
|
997 if (spa_config_held(spa
, SCL_ZIO
, RW_WRITER
)) {
999 * vdev_cant_read and vdev_cant_write can only
1000 * transition from TRUE to FALSE when we have the
1001 * SCL_ZIO lock as writer; otherwise they can only
1002 * transition from FALSE to TRUE. This ensures that
1003 * any zio looking at these values can assume that
1004 * failures persist for the life of the I/O. That's
1005 * important because when a device has intermittent
1006 * connectivity problems, we want to ensure that
1007 * they're ascribed to the device (ENXIO) and not
1010 * Since we hold SCL_ZIO as writer here, clear both
1011 * values so the probe can reevaluate from first
1014 vps
->vps_flags
|= ZIO_FLAG_CONFIG_WRITER
;
1015 vd
->vdev_cant_read
= B_FALSE
;
1016 vd
->vdev_cant_write
= B_FALSE
;
1019 vd
->vdev_probe_zio
= pio
= zio_null(NULL
, spa
, vd
,
1020 vdev_probe_done
, vps
,
1021 vps
->vps_flags
| ZIO_FLAG_DONT_PROPAGATE
);
1024 * We can't change the vdev state in this context, so we
1025 * kick off an async task to do it on our behalf.
1028 vd
->vdev_probe_wanted
= B_TRUE
;
1029 spa_async_request(spa
, SPA_ASYNC_PROBE
);
1034 zio_add_child(zio
, pio
);
1036 mutex_exit(&vd
->vdev_probe_lock
);
1039 ASSERT(zio
!= NULL
);
1043 for (l
= 1; l
< VDEV_LABELS
; l
++) {
1044 zio_nowait(zio_read_phys(pio
, vd
,
1045 vdev_label_offset(vd
->vdev_psize
, l
,
1046 offsetof(vdev_label_t
, vl_pad2
)),
1047 VDEV_PAD_SIZE
, zio_buf_alloc(VDEV_PAD_SIZE
),
1048 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
1049 ZIO_PRIORITY_SYNC_READ
, vps
->vps_flags
, B_TRUE
));
1060 vdev_open_child(void *arg
)
1064 vd
->vdev_open_thread
= curthread
;
1065 vd
->vdev_open_error
= vdev_open(vd
);
1066 vd
->vdev_open_thread
= NULL
;
1070 vdev_uses_zvols(vdev_t
*vd
)
1074 if (vd
->vdev_path
&& strncmp(vd
->vdev_path
, ZVOL_DIR
,
1075 strlen(ZVOL_DIR
)) == 0)
1077 for (c
= 0; c
< vd
->vdev_children
; c
++)
1078 if (vdev_uses_zvols(vd
->vdev_child
[c
]))
1084 vdev_open_children(vdev_t
*vd
)
1087 int children
= vd
->vdev_children
;
1091 * in order to handle pools on top of zvols, do the opens
1092 * in a single thread so that the same thread holds the
1093 * spa_namespace_lock
1095 if (vdev_uses_zvols(vd
)) {
1096 for (c
= 0; c
< children
; c
++)
1097 vd
->vdev_child
[c
]->vdev_open_error
=
1098 vdev_open(vd
->vdev_child
[c
]);
1101 tq
= taskq_create("vdev_open", children
, minclsyspri
,
1102 children
, children
, TASKQ_PREPOPULATE
);
1104 for (c
= 0; c
< children
; c
++)
1105 VERIFY(taskq_dispatch(tq
, vdev_open_child
, vd
->vdev_child
[c
],
1112 * Prepare a virtual device for access.
1115 vdev_open(vdev_t
*vd
)
1117 spa_t
*spa
= vd
->vdev_spa
;
1120 uint64_t asize
, psize
;
1121 uint64_t ashift
= 0;
1124 ASSERT(vd
->vdev_open_thread
== curthread
||
1125 spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1126 ASSERT(vd
->vdev_state
== VDEV_STATE_CLOSED
||
1127 vd
->vdev_state
== VDEV_STATE_CANT_OPEN
||
1128 vd
->vdev_state
== VDEV_STATE_OFFLINE
);
1130 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1131 vd
->vdev_cant_read
= B_FALSE
;
1132 vd
->vdev_cant_write
= B_FALSE
;
1133 vd
->vdev_min_asize
= vdev_get_min_asize(vd
);
1136 * If this vdev is not removed, check its fault status. If it's
1137 * faulted, bail out of the open.
1139 if (!vd
->vdev_removed
&& vd
->vdev_faulted
) {
1140 ASSERT(vd
->vdev_children
== 0);
1141 ASSERT(vd
->vdev_label_aux
== VDEV_AUX_ERR_EXCEEDED
||
1142 vd
->vdev_label_aux
== VDEV_AUX_EXTERNAL
);
1143 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1144 vd
->vdev_label_aux
);
1146 } else if (vd
->vdev_offline
) {
1147 ASSERT(vd
->vdev_children
== 0);
1148 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_OFFLINE
, VDEV_AUX_NONE
);
1152 error
= vd
->vdev_ops
->vdev_op_open(vd
, &osize
, &ashift
);
1155 * Reset the vdev_reopening flag so that we actually close
1156 * the vdev on error.
1158 vd
->vdev_reopening
= B_FALSE
;
1159 if (zio_injection_enabled
&& error
== 0)
1160 error
= zio_handle_device_injection(vd
, NULL
, ENXIO
);
1163 if (vd
->vdev_removed
&&
1164 vd
->vdev_stat
.vs_aux
!= VDEV_AUX_OPEN_FAILED
)
1165 vd
->vdev_removed
= B_FALSE
;
1167 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1168 vd
->vdev_stat
.vs_aux
);
1172 vd
->vdev_removed
= B_FALSE
;
1175 * Recheck the faulted flag now that we have confirmed that
1176 * the vdev is accessible. If we're faulted, bail.
1178 if (vd
->vdev_faulted
) {
1179 ASSERT(vd
->vdev_children
== 0);
1180 ASSERT(vd
->vdev_label_aux
== VDEV_AUX_ERR_EXCEEDED
||
1181 vd
->vdev_label_aux
== VDEV_AUX_EXTERNAL
);
1182 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1183 vd
->vdev_label_aux
);
1187 if (vd
->vdev_degraded
) {
1188 ASSERT(vd
->vdev_children
== 0);
1189 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
1190 VDEV_AUX_ERR_EXCEEDED
);
1192 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_HEALTHY
, 0);
1196 * For hole or missing vdevs we just return success.
1198 if (vd
->vdev_ishole
|| vd
->vdev_ops
== &vdev_missing_ops
)
1201 for (c
= 0; c
< vd
->vdev_children
; c
++) {
1202 if (vd
->vdev_child
[c
]->vdev_state
!= VDEV_STATE_HEALTHY
) {
1203 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
1209 osize
= P2ALIGN(osize
, (uint64_t)sizeof (vdev_label_t
));
1211 if (vd
->vdev_children
== 0) {
1212 if (osize
< SPA_MINDEVSIZE
) {
1213 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1214 VDEV_AUX_TOO_SMALL
);
1218 asize
= osize
- (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
);
1220 if (vd
->vdev_parent
!= NULL
&& osize
< SPA_MINDEVSIZE
-
1221 (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
)) {
1222 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1223 VDEV_AUX_TOO_SMALL
);
1230 vd
->vdev_psize
= psize
;
1233 * Make sure the allocatable size hasn't shrunk.
1235 if (asize
< vd
->vdev_min_asize
) {
1236 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1237 VDEV_AUX_BAD_LABEL
);
1241 if (vd
->vdev_asize
== 0) {
1243 * This is the first-ever open, so use the computed values.
1244 * For testing purposes, a higher ashift can be requested.
1246 vd
->vdev_asize
= asize
;
1247 vd
->vdev_ashift
= MAX(ashift
, vd
->vdev_ashift
);
1250 * Make sure the alignment requirement hasn't increased.
1252 if (ashift
> vd
->vdev_top
->vdev_ashift
) {
1253 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1254 VDEV_AUX_BAD_LABEL
);
1260 * If all children are healthy and the asize has increased,
1261 * then we've experienced dynamic LUN growth. If automatic
1262 * expansion is enabled then use the additional space.
1264 if (vd
->vdev_state
== VDEV_STATE_HEALTHY
&& asize
> vd
->vdev_asize
&&
1265 (vd
->vdev_expanding
|| spa
->spa_autoexpand
))
1266 vd
->vdev_asize
= asize
;
1268 vdev_set_min_asize(vd
);
1271 * Ensure we can issue some IO before declaring the
1272 * vdev open for business.
1274 if (vd
->vdev_ops
->vdev_op_leaf
&&
1275 (error
= zio_wait(vdev_probe(vd
, NULL
))) != 0) {
1276 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1277 VDEV_AUX_ERR_EXCEEDED
);
1282 * If a leaf vdev has a DTL, and seems healthy, then kick off a
1283 * resilver. But don't do this if we are doing a reopen for a scrub,
1284 * since this would just restart the scrub we are already doing.
1286 if (vd
->vdev_ops
->vdev_op_leaf
&& !spa
->spa_scrub_reopen
&&
1287 vdev_resilver_needed(vd
, NULL
, NULL
))
1288 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
1294 * Called once the vdevs are all opened, this routine validates the label
1295 * contents. This needs to be done before vdev_load() so that we don't
1296 * inadvertently do repair I/Os to the wrong device.
1298 * This function will only return failure if one of the vdevs indicates that it
1299 * has since been destroyed or exported. This is only possible if
1300 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
1301 * will be updated but the function will return 0.
1304 vdev_validate(vdev_t
*vd
)
1306 spa_t
*spa
= vd
->vdev_spa
;
1308 uint64_t guid
= 0, top_guid
;
1312 for (c
= 0; c
< vd
->vdev_children
; c
++)
1313 if (vdev_validate(vd
->vdev_child
[c
]) != 0)
1317 * If the device has already failed, or was marked offline, don't do
1318 * any further validation. Otherwise, label I/O will fail and we will
1319 * overwrite the previous state.
1321 if (vd
->vdev_ops
->vdev_op_leaf
&& vdev_readable(vd
)) {
1322 uint64_t aux_guid
= 0;
1325 if ((label
= vdev_label_read_config(vd
)) == NULL
) {
1326 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1327 VDEV_AUX_BAD_LABEL
);
1332 * Determine if this vdev has been split off into another
1333 * pool. If so, then refuse to open it.
1335 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_SPLIT_GUID
,
1336 &aux_guid
) == 0 && aux_guid
== spa_guid(spa
)) {
1337 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1338 VDEV_AUX_SPLIT_POOL
);
1343 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_GUID
,
1344 &guid
) != 0 || guid
!= spa_guid(spa
)) {
1345 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1346 VDEV_AUX_CORRUPT_DATA
);
1351 if (nvlist_lookup_nvlist(label
, ZPOOL_CONFIG_VDEV_TREE
, &nvl
)
1352 != 0 || nvlist_lookup_uint64(nvl
, ZPOOL_CONFIG_ORIG_GUID
,
1357 * If this vdev just became a top-level vdev because its
1358 * sibling was detached, it will have adopted the parent's
1359 * vdev guid -- but the label may or may not be on disk yet.
1360 * Fortunately, either version of the label will have the
1361 * same top guid, so if we're a top-level vdev, we can
1362 * safely compare to that instead.
1364 * If we split this vdev off instead, then we also check the
1365 * original pool's guid. We don't want to consider the vdev
1366 * corrupt if it is partway through a split operation.
1368 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
,
1370 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_TOP_GUID
,
1372 ((vd
->vdev_guid
!= guid
&& vd
->vdev_guid
!= aux_guid
) &&
1373 (vd
->vdev_guid
!= top_guid
|| vd
!= vd
->vdev_top
))) {
1374 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1375 VDEV_AUX_CORRUPT_DATA
);
1380 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
,
1382 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1383 VDEV_AUX_CORRUPT_DATA
);
1391 * If this is a verbatim import, no need to check the
1392 * state of the pool.
1394 if (!(spa
->spa_import_flags
& ZFS_IMPORT_VERBATIM
) &&
1395 spa_load_state(spa
) == SPA_LOAD_OPEN
&&
1396 state
!= POOL_STATE_ACTIVE
)
1400 * If we were able to open and validate a vdev that was
1401 * previously marked permanently unavailable, clear that state
1404 if (vd
->vdev_not_present
)
1405 vd
->vdev_not_present
= 0;
1412 * Close a virtual device.
1415 vdev_close(vdev_t
*vd
)
1417 vdev_t
*pvd
= vd
->vdev_parent
;
1418 ASSERTV(spa_t
*spa
= vd
->vdev_spa
);
1420 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1423 * If our parent is reopening, then we are as well, unless we are
1426 if (pvd
!= NULL
&& pvd
->vdev_reopening
)
1427 vd
->vdev_reopening
= (pvd
->vdev_reopening
&& !vd
->vdev_offline
);
1429 vd
->vdev_ops
->vdev_op_close(vd
);
1431 vdev_cache_purge(vd
);
1434 * We record the previous state before we close it, so that if we are
1435 * doing a reopen(), we don't generate FMA ereports if we notice that
1436 * it's still faulted.
1438 vd
->vdev_prevstate
= vd
->vdev_state
;
1440 if (vd
->vdev_offline
)
1441 vd
->vdev_state
= VDEV_STATE_OFFLINE
;
1443 vd
->vdev_state
= VDEV_STATE_CLOSED
;
1444 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1448 vdev_hold(vdev_t
*vd
)
1450 spa_t
*spa
= vd
->vdev_spa
;
1453 ASSERT(spa_is_root(spa
));
1454 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1457 for (c
= 0; c
< vd
->vdev_children
; c
++)
1458 vdev_hold(vd
->vdev_child
[c
]);
1460 if (vd
->vdev_ops
->vdev_op_leaf
)
1461 vd
->vdev_ops
->vdev_op_hold(vd
);
1465 vdev_rele(vdev_t
*vd
)
1469 ASSERT(spa_is_root(vd
->vdev_spa
));
1470 for (c
= 0; c
< vd
->vdev_children
; c
++)
1471 vdev_rele(vd
->vdev_child
[c
]);
1473 if (vd
->vdev_ops
->vdev_op_leaf
)
1474 vd
->vdev_ops
->vdev_op_rele(vd
);
1478 * Reopen all interior vdevs and any unopened leaves. We don't actually
1479 * reopen leaf vdevs which had previously been opened as they might deadlock
1480 * on the spa_config_lock. Instead we only obtain the leaf's physical size.
1481 * If the leaf has never been opened then open it, as usual.
1484 vdev_reopen(vdev_t
*vd
)
1486 spa_t
*spa
= vd
->vdev_spa
;
1488 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1490 /* set the reopening flag unless we're taking the vdev offline */
1491 vd
->vdev_reopening
= !vd
->vdev_offline
;
1493 (void) vdev_open(vd
);
1496 * Call vdev_validate() here to make sure we have the same device.
1497 * Otherwise, a device with an invalid label could be successfully
1498 * opened in response to vdev_reopen().
1501 (void) vdev_validate_aux(vd
);
1502 if (vdev_readable(vd
) && vdev_writeable(vd
) &&
1503 vd
->vdev_aux
== &spa
->spa_l2cache
&&
1504 !l2arc_vdev_present(vd
))
1505 l2arc_add_vdev(spa
, vd
);
1507 (void) vdev_validate(vd
);
1511 * Reassess parent vdev's health.
1513 vdev_propagate_state(vd
);
1517 vdev_create(vdev_t
*vd
, uint64_t txg
, boolean_t isreplacing
)
1522 * Normally, partial opens (e.g. of a mirror) are allowed.
1523 * For a create, however, we want to fail the request if
1524 * there are any components we can't open.
1526 error
= vdev_open(vd
);
1528 if (error
|| vd
->vdev_state
!= VDEV_STATE_HEALTHY
) {
1530 return (error
? error
: ENXIO
);
1534 * Recursively initialize all labels.
1536 if ((error
= vdev_label_init(vd
, txg
, isreplacing
?
1537 VDEV_LABEL_REPLACE
: VDEV_LABEL_CREATE
)) != 0) {
1546 vdev_metaslab_set_size(vdev_t
*vd
)
1549 * Aim for roughly 200 metaslabs per vdev.
1551 vd
->vdev_ms_shift
= highbit(vd
->vdev_asize
/ 200);
1552 vd
->vdev_ms_shift
= MAX(vd
->vdev_ms_shift
, SPA_MAXBLOCKSHIFT
);
1556 vdev_dirty(vdev_t
*vd
, int flags
, void *arg
, uint64_t txg
)
1558 ASSERT(vd
== vd
->vdev_top
);
1559 ASSERT(!vd
->vdev_ishole
);
1560 ASSERT(ISP2(flags
));
1561 ASSERT(spa_writeable(vd
->vdev_spa
));
1563 if (flags
& VDD_METASLAB
)
1564 (void) txg_list_add(&vd
->vdev_ms_list
, arg
, txg
);
1566 if (flags
& VDD_DTL
)
1567 (void) txg_list_add(&vd
->vdev_dtl_list
, arg
, txg
);
1569 (void) txg_list_add(&vd
->vdev_spa
->spa_vdev_txg_list
, vd
, txg
);
1575 * A vdev's DTL (dirty time log) is the set of transaction groups for which
1576 * the vdev has less than perfect replication. There are four kinds of DTL:
1578 * DTL_MISSING: txgs for which the vdev has no valid copies of the data
1580 * DTL_PARTIAL: txgs for which data is available, but not fully replicated
1582 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
1583 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
1584 * txgs that was scrubbed.
1586 * DTL_OUTAGE: txgs which cannot currently be read, whether due to
1587 * persistent errors or just some device being offline.
1588 * Unlike the other three, the DTL_OUTAGE map is not generally
1589 * maintained; it's only computed when needed, typically to
1590 * determine whether a device can be detached.
1592 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
1593 * either has the data or it doesn't.
1595 * For interior vdevs such as mirror and RAID-Z the picture is more complex.
1596 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
1597 * if any child is less than fully replicated, then so is its parent.
1598 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
1599 * comprising only those txgs which appear in 'maxfaults' or more children;
1600 * those are the txgs we don't have enough replication to read. For example,
1601 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
1602 * thus, its DTL_MISSING consists of the set of txgs that appear in more than
1603 * two child DTL_MISSING maps.
1605 * It should be clear from the above that to compute the DTLs and outage maps
1606 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
1607 * Therefore, that is all we keep on disk. When loading the pool, or after
1608 * a configuration change, we generate all other DTLs from first principles.
1611 vdev_dtl_dirty(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
1613 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1615 ASSERT(t
< DTL_TYPES
);
1616 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
1617 ASSERT(spa_writeable(vd
->vdev_spa
));
1619 mutex_enter(sm
->sm_lock
);
1620 if (!space_map_contains(sm
, txg
, size
))
1621 space_map_add(sm
, txg
, size
);
1622 mutex_exit(sm
->sm_lock
);
1626 vdev_dtl_contains(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
1628 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1629 boolean_t dirty
= B_FALSE
;
1631 ASSERT(t
< DTL_TYPES
);
1632 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
1634 mutex_enter(sm
->sm_lock
);
1635 if (sm
->sm_space
!= 0)
1636 dirty
= space_map_contains(sm
, txg
, size
);
1637 mutex_exit(sm
->sm_lock
);
1643 vdev_dtl_empty(vdev_t
*vd
, vdev_dtl_type_t t
)
1645 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1648 mutex_enter(sm
->sm_lock
);
1649 empty
= (sm
->sm_space
== 0);
1650 mutex_exit(sm
->sm_lock
);
1656 * Reassess DTLs after a config change or scrub completion.
1659 vdev_dtl_reassess(vdev_t
*vd
, uint64_t txg
, uint64_t scrub_txg
, int scrub_done
)
1661 spa_t
*spa
= vd
->vdev_spa
;
1665 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
1667 for (c
= 0; c
< vd
->vdev_children
; c
++)
1668 vdev_dtl_reassess(vd
->vdev_child
[c
], txg
,
1669 scrub_txg
, scrub_done
);
1671 if (vd
== spa
->spa_root_vdev
|| vd
->vdev_ishole
|| vd
->vdev_aux
)
1674 if (vd
->vdev_ops
->vdev_op_leaf
) {
1675 dsl_scan_t
*scn
= spa
->spa_dsl_pool
->dp_scan
;
1677 mutex_enter(&vd
->vdev_dtl_lock
);
1678 if (scrub_txg
!= 0 &&
1679 (spa
->spa_scrub_started
||
1680 (scn
&& scn
->scn_phys
.scn_errors
== 0))) {
1682 * We completed a scrub up to scrub_txg. If we
1683 * did it without rebooting, then the scrub dtl
1684 * will be valid, so excise the old region and
1685 * fold in the scrub dtl. Otherwise, leave the
1686 * dtl as-is if there was an error.
1688 * There's little trick here: to excise the beginning
1689 * of the DTL_MISSING map, we put it into a reference
1690 * tree and then add a segment with refcnt -1 that
1691 * covers the range [0, scrub_txg). This means
1692 * that each txg in that range has refcnt -1 or 0.
1693 * We then add DTL_SCRUB with a refcnt of 2, so that
1694 * entries in the range [0, scrub_txg) will have a
1695 * positive refcnt -- either 1 or 2. We then convert
1696 * the reference tree into the new DTL_MISSING map.
1698 space_map_ref_create(&reftree
);
1699 space_map_ref_add_map(&reftree
,
1700 &vd
->vdev_dtl
[DTL_MISSING
], 1);
1701 space_map_ref_add_seg(&reftree
, 0, scrub_txg
, -1);
1702 space_map_ref_add_map(&reftree
,
1703 &vd
->vdev_dtl
[DTL_SCRUB
], 2);
1704 space_map_ref_generate_map(&reftree
,
1705 &vd
->vdev_dtl
[DTL_MISSING
], 1);
1706 space_map_ref_destroy(&reftree
);
1708 space_map_vacate(&vd
->vdev_dtl
[DTL_PARTIAL
], NULL
, NULL
);
1709 space_map_walk(&vd
->vdev_dtl
[DTL_MISSING
],
1710 space_map_add
, &vd
->vdev_dtl
[DTL_PARTIAL
]);
1712 space_map_vacate(&vd
->vdev_dtl
[DTL_SCRUB
], NULL
, NULL
);
1713 space_map_vacate(&vd
->vdev_dtl
[DTL_OUTAGE
], NULL
, NULL
);
1714 if (!vdev_readable(vd
))
1715 space_map_add(&vd
->vdev_dtl
[DTL_OUTAGE
], 0, -1ULL);
1717 space_map_walk(&vd
->vdev_dtl
[DTL_MISSING
],
1718 space_map_add
, &vd
->vdev_dtl
[DTL_OUTAGE
]);
1719 mutex_exit(&vd
->vdev_dtl_lock
);
1722 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, txg
);
1726 mutex_enter(&vd
->vdev_dtl_lock
);
1727 for (t
= 0; t
< DTL_TYPES
; t
++) {
1728 /* account for child's outage in parent's missing map */
1729 int s
= (t
== DTL_MISSING
) ? DTL_OUTAGE
: t
;
1731 continue; /* leaf vdevs only */
1732 if (t
== DTL_PARTIAL
)
1733 minref
= 1; /* i.e. non-zero */
1734 else if (vd
->vdev_nparity
!= 0)
1735 minref
= vd
->vdev_nparity
+ 1; /* RAID-Z */
1737 minref
= vd
->vdev_children
; /* any kind of mirror */
1738 space_map_ref_create(&reftree
);
1739 for (c
= 0; c
< vd
->vdev_children
; c
++) {
1740 vdev_t
*cvd
= vd
->vdev_child
[c
];
1741 mutex_enter(&cvd
->vdev_dtl_lock
);
1742 space_map_ref_add_map(&reftree
, &cvd
->vdev_dtl
[s
], 1);
1743 mutex_exit(&cvd
->vdev_dtl_lock
);
1745 space_map_ref_generate_map(&reftree
, &vd
->vdev_dtl
[t
], minref
);
1746 space_map_ref_destroy(&reftree
);
1748 mutex_exit(&vd
->vdev_dtl_lock
);
1752 vdev_dtl_load(vdev_t
*vd
)
1754 spa_t
*spa
= vd
->vdev_spa
;
1755 space_map_obj_t
*smo
= &vd
->vdev_dtl_smo
;
1756 objset_t
*mos
= spa
->spa_meta_objset
;
1760 ASSERT(vd
->vdev_children
== 0);
1762 if (smo
->smo_object
== 0)
1765 ASSERT(!vd
->vdev_ishole
);
1767 if ((error
= dmu_bonus_hold(mos
, smo
->smo_object
, FTAG
, &db
)) != 0)
1770 ASSERT3U(db
->db_size
, >=, sizeof (*smo
));
1771 bcopy(db
->db_data
, smo
, sizeof (*smo
));
1772 dmu_buf_rele(db
, FTAG
);
1774 mutex_enter(&vd
->vdev_dtl_lock
);
1775 error
= space_map_load(&vd
->vdev_dtl
[DTL_MISSING
],
1776 NULL
, SM_ALLOC
, smo
, mos
);
1777 mutex_exit(&vd
->vdev_dtl_lock
);
1783 vdev_dtl_sync(vdev_t
*vd
, uint64_t txg
)
1785 spa_t
*spa
= vd
->vdev_spa
;
1786 space_map_obj_t
*smo
= &vd
->vdev_dtl_smo
;
1787 space_map_t
*sm
= &vd
->vdev_dtl
[DTL_MISSING
];
1788 objset_t
*mos
= spa
->spa_meta_objset
;
1794 ASSERT(!vd
->vdev_ishole
);
1796 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
1798 if (vd
->vdev_detached
) {
1799 if (smo
->smo_object
!= 0) {
1800 VERIFY(0 == dmu_object_free(mos
, smo
->smo_object
, tx
));
1801 smo
->smo_object
= 0;
1807 if (smo
->smo_object
== 0) {
1808 ASSERT(smo
->smo_objsize
== 0);
1809 ASSERT(smo
->smo_alloc
== 0);
1810 smo
->smo_object
= dmu_object_alloc(mos
,
1811 DMU_OT_SPACE_MAP
, 1 << SPACE_MAP_BLOCKSHIFT
,
1812 DMU_OT_SPACE_MAP_HEADER
, sizeof (*smo
), tx
);
1813 ASSERT(smo
->smo_object
!= 0);
1814 vdev_config_dirty(vd
->vdev_top
);
1817 mutex_init(&smlock
, NULL
, MUTEX_DEFAULT
, NULL
);
1819 space_map_create(&smsync
, sm
->sm_start
, sm
->sm_size
, sm
->sm_shift
,
1822 mutex_enter(&smlock
);
1824 mutex_enter(&vd
->vdev_dtl_lock
);
1825 space_map_walk(sm
, space_map_add
, &smsync
);
1826 mutex_exit(&vd
->vdev_dtl_lock
);
1828 space_map_truncate(smo
, mos
, tx
);
1829 space_map_sync(&smsync
, SM_ALLOC
, smo
, mos
, tx
);
1831 space_map_destroy(&smsync
);
1833 mutex_exit(&smlock
);
1834 mutex_destroy(&smlock
);
1836 VERIFY(0 == dmu_bonus_hold(mos
, smo
->smo_object
, FTAG
, &db
));
1837 dmu_buf_will_dirty(db
, tx
);
1838 ASSERT3U(db
->db_size
, >=, sizeof (*smo
));
1839 bcopy(smo
, db
->db_data
, sizeof (*smo
));
1840 dmu_buf_rele(db
, FTAG
);
1846 * Determine whether the specified vdev can be offlined/detached/removed
1847 * without losing data.
1850 vdev_dtl_required(vdev_t
*vd
)
1852 spa_t
*spa
= vd
->vdev_spa
;
1853 vdev_t
*tvd
= vd
->vdev_top
;
1854 uint8_t cant_read
= vd
->vdev_cant_read
;
1857 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1859 if (vd
== spa
->spa_root_vdev
|| vd
== tvd
)
1863 * Temporarily mark the device as unreadable, and then determine
1864 * whether this results in any DTL outages in the top-level vdev.
1865 * If not, we can safely offline/detach/remove the device.
1867 vd
->vdev_cant_read
= B_TRUE
;
1868 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
1869 required
= !vdev_dtl_empty(tvd
, DTL_OUTAGE
);
1870 vd
->vdev_cant_read
= cant_read
;
1871 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
1873 if (!required
&& zio_injection_enabled
)
1874 required
= !!zio_handle_device_injection(vd
, NULL
, ECHILD
);
1880 * Determine if resilver is needed, and if so the txg range.
1883 vdev_resilver_needed(vdev_t
*vd
, uint64_t *minp
, uint64_t *maxp
)
1885 boolean_t needed
= B_FALSE
;
1886 uint64_t thismin
= UINT64_MAX
;
1887 uint64_t thismax
= 0;
1890 if (vd
->vdev_children
== 0) {
1891 mutex_enter(&vd
->vdev_dtl_lock
);
1892 if (vd
->vdev_dtl
[DTL_MISSING
].sm_space
!= 0 &&
1893 vdev_writeable(vd
)) {
1896 ss
= avl_first(&vd
->vdev_dtl
[DTL_MISSING
].sm_root
);
1897 thismin
= ss
->ss_start
- 1;
1898 ss
= avl_last(&vd
->vdev_dtl
[DTL_MISSING
].sm_root
);
1899 thismax
= ss
->ss_end
;
1902 mutex_exit(&vd
->vdev_dtl_lock
);
1904 for (c
= 0; c
< vd
->vdev_children
; c
++) {
1905 vdev_t
*cvd
= vd
->vdev_child
[c
];
1906 uint64_t cmin
, cmax
;
1908 if (vdev_resilver_needed(cvd
, &cmin
, &cmax
)) {
1909 thismin
= MIN(thismin
, cmin
);
1910 thismax
= MAX(thismax
, cmax
);
1916 if (needed
&& minp
) {
1924 vdev_load(vdev_t
*vd
)
1929 * Recursively load all children.
1931 for (c
= 0; c
< vd
->vdev_children
; c
++)
1932 vdev_load(vd
->vdev_child
[c
]);
1935 * If this is a top-level vdev, initialize its metaslabs.
1937 if (vd
== vd
->vdev_top
&& !vd
->vdev_ishole
&&
1938 (vd
->vdev_ashift
== 0 || vd
->vdev_asize
== 0 ||
1939 vdev_metaslab_init(vd
, 0) != 0))
1940 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1941 VDEV_AUX_CORRUPT_DATA
);
1944 * If this is a leaf vdev, load its DTL.
1946 if (vd
->vdev_ops
->vdev_op_leaf
&& vdev_dtl_load(vd
) != 0)
1947 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1948 VDEV_AUX_CORRUPT_DATA
);
1952 * The special vdev case is used for hot spares and l2cache devices. Its
1953 * sole purpose it to set the vdev state for the associated vdev. To do this,
1954 * we make sure that we can open the underlying device, then try to read the
1955 * label, and make sure that the label is sane and that it hasn't been
1956 * repurposed to another pool.
1959 vdev_validate_aux(vdev_t
*vd
)
1962 uint64_t guid
, version
;
1965 if (!vdev_readable(vd
))
1968 if ((label
= vdev_label_read_config(vd
)) == NULL
) {
1969 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1970 VDEV_AUX_CORRUPT_DATA
);
1974 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_VERSION
, &version
) != 0 ||
1975 version
> SPA_VERSION
||
1976 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
, &guid
) != 0 ||
1977 guid
!= vd
->vdev_guid
||
1978 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
, &state
) != 0) {
1979 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1980 VDEV_AUX_CORRUPT_DATA
);
1986 * We don't actually check the pool state here. If it's in fact in
1987 * use by another pool, we update this fact on the fly when requested.
1994 vdev_remove(vdev_t
*vd
, uint64_t txg
)
1996 spa_t
*spa
= vd
->vdev_spa
;
1997 objset_t
*mos
= spa
->spa_meta_objset
;
2001 tx
= dmu_tx_create_assigned(spa_get_dsl(spa
), txg
);
2003 if (vd
->vdev_dtl_smo
.smo_object
) {
2004 ASSERT3U(vd
->vdev_dtl_smo
.smo_alloc
, ==, 0);
2005 (void) dmu_object_free(mos
, vd
->vdev_dtl_smo
.smo_object
, tx
);
2006 vd
->vdev_dtl_smo
.smo_object
= 0;
2009 if (vd
->vdev_ms
!= NULL
) {
2010 for (m
= 0; m
< vd
->vdev_ms_count
; m
++) {
2011 metaslab_t
*msp
= vd
->vdev_ms
[m
];
2013 if (msp
== NULL
|| msp
->ms_smo
.smo_object
== 0)
2016 ASSERT3U(msp
->ms_smo
.smo_alloc
, ==, 0);
2017 (void) dmu_object_free(mos
, msp
->ms_smo
.smo_object
, tx
);
2018 msp
->ms_smo
.smo_object
= 0;
2022 if (vd
->vdev_ms_array
) {
2023 (void) dmu_object_free(mos
, vd
->vdev_ms_array
, tx
);
2024 vd
->vdev_ms_array
= 0;
2025 vd
->vdev_ms_shift
= 0;
2031 vdev_sync_done(vdev_t
*vd
, uint64_t txg
)
2034 boolean_t reassess
= !txg_list_empty(&vd
->vdev_ms_list
, TXG_CLEAN(txg
));
2036 ASSERT(!vd
->vdev_ishole
);
2038 while ((msp
= txg_list_remove(&vd
->vdev_ms_list
, TXG_CLEAN(txg
))))
2039 metaslab_sync_done(msp
, txg
);
2042 metaslab_sync_reassess(vd
->vdev_mg
);
2046 vdev_sync(vdev_t
*vd
, uint64_t txg
)
2048 spa_t
*spa
= vd
->vdev_spa
;
2053 ASSERT(!vd
->vdev_ishole
);
2055 if (vd
->vdev_ms_array
== 0 && vd
->vdev_ms_shift
!= 0) {
2056 ASSERT(vd
== vd
->vdev_top
);
2057 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
2058 vd
->vdev_ms_array
= dmu_object_alloc(spa
->spa_meta_objset
,
2059 DMU_OT_OBJECT_ARRAY
, 0, DMU_OT_NONE
, 0, tx
);
2060 ASSERT(vd
->vdev_ms_array
!= 0);
2061 vdev_config_dirty(vd
);
2066 * Remove the metadata associated with this vdev once it's empty.
2068 if (vd
->vdev_stat
.vs_alloc
== 0 && vd
->vdev_removing
)
2069 vdev_remove(vd
, txg
);
2071 while ((msp
= txg_list_remove(&vd
->vdev_ms_list
, txg
)) != NULL
) {
2072 metaslab_sync(msp
, txg
);
2073 (void) txg_list_add(&vd
->vdev_ms_list
, msp
, TXG_CLEAN(txg
));
2076 while ((lvd
= txg_list_remove(&vd
->vdev_dtl_list
, txg
)) != NULL
)
2077 vdev_dtl_sync(lvd
, txg
);
2079 (void) txg_list_add(&spa
->spa_vdev_txg_list
, vd
, TXG_CLEAN(txg
));
2083 vdev_psize_to_asize(vdev_t
*vd
, uint64_t psize
)
2085 return (vd
->vdev_ops
->vdev_op_asize(vd
, psize
));
2089 * Mark the given vdev faulted. A faulted vdev behaves as if the device could
2090 * not be opened, and no I/O is attempted.
2093 vdev_fault(spa_t
*spa
, uint64_t guid
, vdev_aux_t aux
)
2097 spa_vdev_state_enter(spa
, SCL_NONE
);
2099 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2100 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2102 if (!vd
->vdev_ops
->vdev_op_leaf
)
2103 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2108 * We don't directly use the aux state here, but if we do a
2109 * vdev_reopen(), we need this value to be present to remember why we
2112 vd
->vdev_label_aux
= aux
;
2115 * Faulted state takes precedence over degraded.
2117 vd
->vdev_delayed_close
= B_FALSE
;
2118 vd
->vdev_faulted
= 1ULL;
2119 vd
->vdev_degraded
= 0ULL;
2120 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_FAULTED
, aux
);
2123 * If this device has the only valid copy of the data, then
2124 * back off and simply mark the vdev as degraded instead.
2126 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&& vdev_dtl_required(vd
)) {
2127 vd
->vdev_degraded
= 1ULL;
2128 vd
->vdev_faulted
= 0ULL;
2131 * If we reopen the device and it's not dead, only then do we
2136 if (vdev_readable(vd
))
2137 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
, aux
);
2140 return (spa_vdev_state_exit(spa
, vd
, 0));
2144 * Mark the given vdev degraded. A degraded vdev is purely an indication to the
2145 * user that something is wrong. The vdev continues to operate as normal as far
2146 * as I/O is concerned.
2149 vdev_degrade(spa_t
*spa
, uint64_t guid
, vdev_aux_t aux
)
2153 spa_vdev_state_enter(spa
, SCL_NONE
);
2155 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2156 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2158 if (!vd
->vdev_ops
->vdev_op_leaf
)
2159 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2162 * If the vdev is already faulted, then don't do anything.
2164 if (vd
->vdev_faulted
|| vd
->vdev_degraded
)
2165 return (spa_vdev_state_exit(spa
, NULL
, 0));
2167 vd
->vdev_degraded
= 1ULL;
2168 if (!vdev_is_dead(vd
))
2169 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
,
2172 return (spa_vdev_state_exit(spa
, vd
, 0));
2176 * Online the given vdev. If 'unspare' is set, it implies two things. First,
2177 * any attached spare device should be detached when the device finishes
2178 * resilvering. Second, the online should be treated like a 'test' online case,
2179 * so no FMA events are generated if the device fails to open.
2182 vdev_online(spa_t
*spa
, uint64_t guid
, uint64_t flags
, vdev_state_t
*newstate
)
2184 vdev_t
*vd
, *tvd
, *pvd
, *rvd
= spa
->spa_root_vdev
;
2186 spa_vdev_state_enter(spa
, SCL_NONE
);
2188 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2189 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2191 if (!vd
->vdev_ops
->vdev_op_leaf
)
2192 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2195 vd
->vdev_offline
= B_FALSE
;
2196 vd
->vdev_tmpoffline
= B_FALSE
;
2197 vd
->vdev_checkremove
= !!(flags
& ZFS_ONLINE_CHECKREMOVE
);
2198 vd
->vdev_forcefault
= !!(flags
& ZFS_ONLINE_FORCEFAULT
);
2200 /* XXX - L2ARC 1.0 does not support expansion */
2201 if (!vd
->vdev_aux
) {
2202 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2203 pvd
->vdev_expanding
= !!(flags
& ZFS_ONLINE_EXPAND
);
2207 vd
->vdev_checkremove
= vd
->vdev_forcefault
= B_FALSE
;
2209 if (!vd
->vdev_aux
) {
2210 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2211 pvd
->vdev_expanding
= B_FALSE
;
2215 *newstate
= vd
->vdev_state
;
2216 if ((flags
& ZFS_ONLINE_UNSPARE
) &&
2217 !vdev_is_dead(vd
) && vd
->vdev_parent
&&
2218 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
2219 vd
->vdev_parent
->vdev_child
[0] == vd
)
2220 vd
->vdev_unspare
= B_TRUE
;
2222 if ((flags
& ZFS_ONLINE_EXPAND
) || spa
->spa_autoexpand
) {
2224 /* XXX - L2ARC 1.0 does not support expansion */
2226 return (spa_vdev_state_exit(spa
, vd
, ENOTSUP
));
2227 spa_async_request(spa
, SPA_ASYNC_CONFIG_UPDATE
);
2229 return (spa_vdev_state_exit(spa
, vd
, 0));
2233 vdev_offline_locked(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
2237 uint64_t generation
;
2238 metaslab_group_t
*mg
;
2241 spa_vdev_state_enter(spa
, SCL_ALLOC
);
2243 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2244 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2246 if (!vd
->vdev_ops
->vdev_op_leaf
)
2247 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2251 generation
= spa
->spa_config_generation
+ 1;
2254 * If the device isn't already offline, try to offline it.
2256 if (!vd
->vdev_offline
) {
2258 * If this device has the only valid copy of some data,
2259 * don't allow it to be offlined. Log devices are always
2262 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&&
2263 vdev_dtl_required(vd
))
2264 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
2267 * If the top-level is a slog and it has had allocations
2268 * then proceed. We check that the vdev's metaslab group
2269 * is not NULL since it's possible that we may have just
2270 * added this vdev but not yet initialized its metaslabs.
2272 if (tvd
->vdev_islog
&& mg
!= NULL
) {
2274 * Prevent any future allocations.
2276 metaslab_group_passivate(mg
);
2277 (void) spa_vdev_state_exit(spa
, vd
, 0);
2279 error
= spa_offline_log(spa
);
2281 spa_vdev_state_enter(spa
, SCL_ALLOC
);
2284 * Check to see if the config has changed.
2286 if (error
|| generation
!= spa
->spa_config_generation
) {
2287 metaslab_group_activate(mg
);
2289 return (spa_vdev_state_exit(spa
,
2291 (void) spa_vdev_state_exit(spa
, vd
, 0);
2294 ASSERT3U(tvd
->vdev_stat
.vs_alloc
, ==, 0);
2298 * Offline this device and reopen its top-level vdev.
2299 * If the top-level vdev is a log device then just offline
2300 * it. Otherwise, if this action results in the top-level
2301 * vdev becoming unusable, undo it and fail the request.
2303 vd
->vdev_offline
= B_TRUE
;
2306 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&&
2307 vdev_is_dead(tvd
)) {
2308 vd
->vdev_offline
= B_FALSE
;
2310 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
2314 * Add the device back into the metaslab rotor so that
2315 * once we online the device it's open for business.
2317 if (tvd
->vdev_islog
&& mg
!= NULL
)
2318 metaslab_group_activate(mg
);
2321 vd
->vdev_tmpoffline
= !!(flags
& ZFS_OFFLINE_TEMPORARY
);
2323 return (spa_vdev_state_exit(spa
, vd
, 0));
2327 vdev_offline(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
2331 mutex_enter(&spa
->spa_vdev_top_lock
);
2332 error
= vdev_offline_locked(spa
, guid
, flags
);
2333 mutex_exit(&spa
->spa_vdev_top_lock
);
2339 * Clear the error counts associated with this vdev. Unlike vdev_online() and
2340 * vdev_offline(), we assume the spa config is locked. We also clear all
2341 * children. If 'vd' is NULL, then the user wants to clear all vdevs.
2344 vdev_clear(spa_t
*spa
, vdev_t
*vd
)
2346 vdev_t
*rvd
= spa
->spa_root_vdev
;
2349 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
2354 vd
->vdev_stat
.vs_read_errors
= 0;
2355 vd
->vdev_stat
.vs_write_errors
= 0;
2356 vd
->vdev_stat
.vs_checksum_errors
= 0;
2358 for (c
= 0; c
< vd
->vdev_children
; c
++)
2359 vdev_clear(spa
, vd
->vdev_child
[c
]);
2362 * If we're in the FAULTED state or have experienced failed I/O, then
2363 * clear the persistent state and attempt to reopen the device. We
2364 * also mark the vdev config dirty, so that the new faulted state is
2365 * written out to disk.
2367 if (vd
->vdev_faulted
|| vd
->vdev_degraded
||
2368 !vdev_readable(vd
) || !vdev_writeable(vd
)) {
2371 * When reopening in reponse to a clear event, it may be due to
2372 * a fmadm repair request. In this case, if the device is
2373 * still broken, we want to still post the ereport again.
2375 vd
->vdev_forcefault
= B_TRUE
;
2377 vd
->vdev_faulted
= vd
->vdev_degraded
= 0ULL;
2378 vd
->vdev_cant_read
= B_FALSE
;
2379 vd
->vdev_cant_write
= B_FALSE
;
2381 vdev_reopen(vd
== rvd
? rvd
: vd
->vdev_top
);
2383 vd
->vdev_forcefault
= B_FALSE
;
2385 if (vd
!= rvd
&& vdev_writeable(vd
->vdev_top
))
2386 vdev_state_dirty(vd
->vdev_top
);
2388 if (vd
->vdev_aux
== NULL
&& !vdev_is_dead(vd
))
2389 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
2391 spa_event_notify(spa
, vd
, ESC_ZFS_VDEV_CLEAR
);
2395 * When clearing a FMA-diagnosed fault, we always want to
2396 * unspare the device, as we assume that the original spare was
2397 * done in response to the FMA fault.
2399 if (!vdev_is_dead(vd
) && vd
->vdev_parent
!= NULL
&&
2400 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
2401 vd
->vdev_parent
->vdev_child
[0] == vd
)
2402 vd
->vdev_unspare
= B_TRUE
;
2406 vdev_is_dead(vdev_t
*vd
)
2409 * Holes and missing devices are always considered "dead".
2410 * This simplifies the code since we don't have to check for
2411 * these types of devices in the various code paths.
2412 * Instead we rely on the fact that we skip over dead devices
2413 * before issuing I/O to them.
2415 return (vd
->vdev_state
< VDEV_STATE_DEGRADED
|| vd
->vdev_ishole
||
2416 vd
->vdev_ops
== &vdev_missing_ops
);
2420 vdev_readable(vdev_t
*vd
)
2422 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_read
);
2426 vdev_writeable(vdev_t
*vd
)
2428 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_write
);
2432 vdev_allocatable(vdev_t
*vd
)
2434 uint64_t state
= vd
->vdev_state
;
2437 * We currently allow allocations from vdevs which may be in the
2438 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
2439 * fails to reopen then we'll catch it later when we're holding
2440 * the proper locks. Note that we have to get the vdev state
2441 * in a local variable because although it changes atomically,
2442 * we're asking two separate questions about it.
2444 return (!(state
< VDEV_STATE_DEGRADED
&& state
!= VDEV_STATE_CLOSED
) &&
2445 !vd
->vdev_cant_write
&& !vd
->vdev_ishole
);
2449 vdev_accessible(vdev_t
*vd
, zio_t
*zio
)
2451 ASSERT(zio
->io_vd
== vd
);
2453 if (vdev_is_dead(vd
) || vd
->vdev_remove_wanted
)
2456 if (zio
->io_type
== ZIO_TYPE_READ
)
2457 return (!vd
->vdev_cant_read
);
2459 if (zio
->io_type
== ZIO_TYPE_WRITE
)
2460 return (!vd
->vdev_cant_write
);
2466 * Get statistics for the given vdev.
2469 vdev_get_stats(vdev_t
*vd
, vdev_stat_t
*vs
)
2471 vdev_t
*rvd
= vd
->vdev_spa
->spa_root_vdev
;
2474 mutex_enter(&vd
->vdev_stat_lock
);
2475 bcopy(&vd
->vdev_stat
, vs
, sizeof (*vs
));
2476 vs
->vs_timestamp
= gethrtime() - vs
->vs_timestamp
;
2477 vs
->vs_state
= vd
->vdev_state
;
2478 vs
->vs_rsize
= vdev_get_min_asize(vd
);
2479 if (vd
->vdev_ops
->vdev_op_leaf
)
2480 vs
->vs_rsize
+= VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
;
2481 mutex_exit(&vd
->vdev_stat_lock
);
2484 * If we're getting stats on the root vdev, aggregate the I/O counts
2485 * over all top-level vdevs (i.e. the direct children of the root).
2488 for (c
= 0; c
< rvd
->vdev_children
; c
++) {
2489 vdev_t
*cvd
= rvd
->vdev_child
[c
];
2490 vdev_stat_t
*cvs
= &cvd
->vdev_stat
;
2492 mutex_enter(&vd
->vdev_stat_lock
);
2493 for (t
= 0; t
< ZIO_TYPES
; t
++) {
2494 vs
->vs_ops
[t
] += cvs
->vs_ops
[t
];
2495 vs
->vs_bytes
[t
] += cvs
->vs_bytes
[t
];
2497 cvs
->vs_scan_removing
= cvd
->vdev_removing
;
2498 mutex_exit(&vd
->vdev_stat_lock
);
2504 vdev_clear_stats(vdev_t
*vd
)
2506 mutex_enter(&vd
->vdev_stat_lock
);
2507 vd
->vdev_stat
.vs_space
= 0;
2508 vd
->vdev_stat
.vs_dspace
= 0;
2509 vd
->vdev_stat
.vs_alloc
= 0;
2510 mutex_exit(&vd
->vdev_stat_lock
);
2514 vdev_scan_stat_init(vdev_t
*vd
)
2516 vdev_stat_t
*vs
= &vd
->vdev_stat
;
2519 for (c
= 0; c
< vd
->vdev_children
; c
++)
2520 vdev_scan_stat_init(vd
->vdev_child
[c
]);
2522 mutex_enter(&vd
->vdev_stat_lock
);
2523 vs
->vs_scan_processed
= 0;
2524 mutex_exit(&vd
->vdev_stat_lock
);
2528 vdev_stat_update(zio_t
*zio
, uint64_t psize
)
2530 spa_t
*spa
= zio
->io_spa
;
2531 vdev_t
*rvd
= spa
->spa_root_vdev
;
2532 vdev_t
*vd
= zio
->io_vd
? zio
->io_vd
: rvd
;
2534 uint64_t txg
= zio
->io_txg
;
2535 vdev_stat_t
*vs
= &vd
->vdev_stat
;
2536 zio_type_t type
= zio
->io_type
;
2537 int flags
= zio
->io_flags
;
2540 * If this i/o is a gang leader, it didn't do any actual work.
2542 if (zio
->io_gang_tree
)
2545 if (zio
->io_error
== 0) {
2547 * If this is a root i/o, don't count it -- we've already
2548 * counted the top-level vdevs, and vdev_get_stats() will
2549 * aggregate them when asked. This reduces contention on
2550 * the root vdev_stat_lock and implicitly handles blocks
2551 * that compress away to holes, for which there is no i/o.
2552 * (Holes never create vdev children, so all the counters
2553 * remain zero, which is what we want.)
2555 * Note: this only applies to successful i/o (io_error == 0)
2556 * because unlike i/o counts, errors are not additive.
2557 * When reading a ditto block, for example, failure of
2558 * one top-level vdev does not imply a root-level error.
2563 ASSERT(vd
== zio
->io_vd
);
2565 if (flags
& ZIO_FLAG_IO_BYPASS
)
2568 mutex_enter(&vd
->vdev_stat_lock
);
2570 if (flags
& ZIO_FLAG_IO_REPAIR
) {
2571 if (flags
& ZIO_FLAG_SCAN_THREAD
) {
2572 dsl_scan_phys_t
*scn_phys
=
2573 &spa
->spa_dsl_pool
->dp_scan
->scn_phys
;
2574 uint64_t *processed
= &scn_phys
->scn_processed
;
2577 if (vd
->vdev_ops
->vdev_op_leaf
)
2578 atomic_add_64(processed
, psize
);
2579 vs
->vs_scan_processed
+= psize
;
2582 if (flags
& ZIO_FLAG_SELF_HEAL
)
2583 vs
->vs_self_healed
+= psize
;
2587 vs
->vs_bytes
[type
] += psize
;
2589 mutex_exit(&vd
->vdev_stat_lock
);
2593 if (flags
& ZIO_FLAG_SPECULATIVE
)
2597 * If this is an I/O error that is going to be retried, then ignore the
2598 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as
2599 * hard errors, when in reality they can happen for any number of
2600 * innocuous reasons (bus resets, MPxIO link failure, etc).
2602 if (zio
->io_error
== EIO
&&
2603 !(zio
->io_flags
& ZIO_FLAG_IO_RETRY
))
2607 * Intent logs writes won't propagate their error to the root
2608 * I/O so don't mark these types of failures as pool-level
2611 if (zio
->io_vd
== NULL
&& (zio
->io_flags
& ZIO_FLAG_DONT_PROPAGATE
))
2614 mutex_enter(&vd
->vdev_stat_lock
);
2615 if (type
== ZIO_TYPE_READ
&& !vdev_is_dead(vd
)) {
2616 if (zio
->io_error
== ECKSUM
)
2617 vs
->vs_checksum_errors
++;
2619 vs
->vs_read_errors
++;
2621 if (type
== ZIO_TYPE_WRITE
&& !vdev_is_dead(vd
))
2622 vs
->vs_write_errors
++;
2623 mutex_exit(&vd
->vdev_stat_lock
);
2625 if (type
== ZIO_TYPE_WRITE
&& txg
!= 0 &&
2626 (!(flags
& ZIO_FLAG_IO_REPAIR
) ||
2627 (flags
& ZIO_FLAG_SCAN_THREAD
) ||
2628 spa
->spa_claiming
)) {
2630 * This is either a normal write (not a repair), or it's
2631 * a repair induced by the scrub thread, or it's a repair
2632 * made by zil_claim() during spa_load() in the first txg.
2633 * In the normal case, we commit the DTL change in the same
2634 * txg as the block was born. In the scrub-induced repair
2635 * case, we know that scrubs run in first-pass syncing context,
2636 * so we commit the DTL change in spa_syncing_txg(spa).
2637 * In the zil_claim() case, we commit in spa_first_txg(spa).
2639 * We currently do not make DTL entries for failed spontaneous
2640 * self-healing writes triggered by normal (non-scrubbing)
2641 * reads, because we have no transactional context in which to
2642 * do so -- and it's not clear that it'd be desirable anyway.
2644 if (vd
->vdev_ops
->vdev_op_leaf
) {
2645 uint64_t commit_txg
= txg
;
2646 if (flags
& ZIO_FLAG_SCAN_THREAD
) {
2647 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
2648 ASSERT(spa_sync_pass(spa
) == 1);
2649 vdev_dtl_dirty(vd
, DTL_SCRUB
, txg
, 1);
2650 commit_txg
= spa_syncing_txg(spa
);
2651 } else if (spa
->spa_claiming
) {
2652 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
2653 commit_txg
= spa_first_txg(spa
);
2655 ASSERT(commit_txg
>= spa_syncing_txg(spa
));
2656 if (vdev_dtl_contains(vd
, DTL_MISSING
, txg
, 1))
2658 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2659 vdev_dtl_dirty(pvd
, DTL_PARTIAL
, txg
, 1);
2660 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, commit_txg
);
2663 vdev_dtl_dirty(vd
, DTL_MISSING
, txg
, 1);
2668 * Update the in-core space usage stats for this vdev, its metaslab class,
2669 * and the root vdev.
2672 vdev_space_update(vdev_t
*vd
, int64_t alloc_delta
, int64_t defer_delta
,
2673 int64_t space_delta
)
2675 int64_t dspace_delta
= space_delta
;
2676 spa_t
*spa
= vd
->vdev_spa
;
2677 vdev_t
*rvd
= spa
->spa_root_vdev
;
2678 metaslab_group_t
*mg
= vd
->vdev_mg
;
2679 metaslab_class_t
*mc
= mg
? mg
->mg_class
: NULL
;
2681 ASSERT(vd
== vd
->vdev_top
);
2684 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
2685 * factor. We must calculate this here and not at the root vdev
2686 * because the root vdev's psize-to-asize is simply the max of its
2687 * childrens', thus not accurate enough for us.
2689 ASSERT((dspace_delta
& (SPA_MINBLOCKSIZE
-1)) == 0);
2690 ASSERT(vd
->vdev_deflate_ratio
!= 0 || vd
->vdev_isl2cache
);
2691 dspace_delta
= (dspace_delta
>> SPA_MINBLOCKSHIFT
) *
2692 vd
->vdev_deflate_ratio
;
2694 mutex_enter(&vd
->vdev_stat_lock
);
2695 vd
->vdev_stat
.vs_alloc
+= alloc_delta
;
2696 vd
->vdev_stat
.vs_space
+= space_delta
;
2697 vd
->vdev_stat
.vs_dspace
+= dspace_delta
;
2698 mutex_exit(&vd
->vdev_stat_lock
);
2700 if (mc
== spa_normal_class(spa
)) {
2701 mutex_enter(&rvd
->vdev_stat_lock
);
2702 rvd
->vdev_stat
.vs_alloc
+= alloc_delta
;
2703 rvd
->vdev_stat
.vs_space
+= space_delta
;
2704 rvd
->vdev_stat
.vs_dspace
+= dspace_delta
;
2705 mutex_exit(&rvd
->vdev_stat_lock
);
2709 ASSERT(rvd
== vd
->vdev_parent
);
2710 ASSERT(vd
->vdev_ms_count
!= 0);
2712 metaslab_class_space_update(mc
,
2713 alloc_delta
, defer_delta
, space_delta
, dspace_delta
);
2718 * Mark a top-level vdev's config as dirty, placing it on the dirty list
2719 * so that it will be written out next time the vdev configuration is synced.
2720 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
2723 vdev_config_dirty(vdev_t
*vd
)
2725 spa_t
*spa
= vd
->vdev_spa
;
2726 vdev_t
*rvd
= spa
->spa_root_vdev
;
2729 ASSERT(spa_writeable(spa
));
2732 * If this is an aux vdev (as with l2cache and spare devices), then we
2733 * update the vdev config manually and set the sync flag.
2735 if (vd
->vdev_aux
!= NULL
) {
2736 spa_aux_vdev_t
*sav
= vd
->vdev_aux
;
2740 for (c
= 0; c
< sav
->sav_count
; c
++) {
2741 if (sav
->sav_vdevs
[c
] == vd
)
2745 if (c
== sav
->sav_count
) {
2747 * We're being removed. There's nothing more to do.
2749 ASSERT(sav
->sav_sync
== B_TRUE
);
2753 sav
->sav_sync
= B_TRUE
;
2755 if (nvlist_lookup_nvlist_array(sav
->sav_config
,
2756 ZPOOL_CONFIG_L2CACHE
, &aux
, &naux
) != 0) {
2757 VERIFY(nvlist_lookup_nvlist_array(sav
->sav_config
,
2758 ZPOOL_CONFIG_SPARES
, &aux
, &naux
) == 0);
2764 * Setting the nvlist in the middle if the array is a little
2765 * sketchy, but it will work.
2767 nvlist_free(aux
[c
]);
2768 aux
[c
] = vdev_config_generate(spa
, vd
, B_TRUE
, 0);
2774 * The dirty list is protected by the SCL_CONFIG lock. The caller
2775 * must either hold SCL_CONFIG as writer, or must be the sync thread
2776 * (which holds SCL_CONFIG as reader). There's only one sync thread,
2777 * so this is sufficient to ensure mutual exclusion.
2779 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
2780 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2781 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
2784 for (c
= 0; c
< rvd
->vdev_children
; c
++)
2785 vdev_config_dirty(rvd
->vdev_child
[c
]);
2787 ASSERT(vd
== vd
->vdev_top
);
2789 if (!list_link_active(&vd
->vdev_config_dirty_node
) &&
2791 list_insert_head(&spa
->spa_config_dirty_list
, vd
);
2796 vdev_config_clean(vdev_t
*vd
)
2798 spa_t
*spa
= vd
->vdev_spa
;
2800 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
2801 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2802 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
2804 ASSERT(list_link_active(&vd
->vdev_config_dirty_node
));
2805 list_remove(&spa
->spa_config_dirty_list
, vd
);
2809 * Mark a top-level vdev's state as dirty, so that the next pass of
2810 * spa_sync() can convert this into vdev_config_dirty(). We distinguish
2811 * the state changes from larger config changes because they require
2812 * much less locking, and are often needed for administrative actions.
2815 vdev_state_dirty(vdev_t
*vd
)
2817 spa_t
*spa
= vd
->vdev_spa
;
2819 ASSERT(spa_writeable(spa
));
2820 ASSERT(vd
== vd
->vdev_top
);
2823 * The state list is protected by the SCL_STATE lock. The caller
2824 * must either hold SCL_STATE as writer, or must be the sync thread
2825 * (which holds SCL_STATE as reader). There's only one sync thread,
2826 * so this is sufficient to ensure mutual exclusion.
2828 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
2829 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2830 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
2832 if (!list_link_active(&vd
->vdev_state_dirty_node
) && !vd
->vdev_ishole
)
2833 list_insert_head(&spa
->spa_state_dirty_list
, vd
);
2837 vdev_state_clean(vdev_t
*vd
)
2839 spa_t
*spa
= vd
->vdev_spa
;
2841 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
2842 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2843 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
2845 ASSERT(list_link_active(&vd
->vdev_state_dirty_node
));
2846 list_remove(&spa
->spa_state_dirty_list
, vd
);
2850 * Propagate vdev state up from children to parent.
2853 vdev_propagate_state(vdev_t
*vd
)
2855 spa_t
*spa
= vd
->vdev_spa
;
2856 vdev_t
*rvd
= spa
->spa_root_vdev
;
2857 int degraded
= 0, faulted
= 0;
2862 if (vd
->vdev_children
> 0) {
2863 for (c
= 0; c
< vd
->vdev_children
; c
++) {
2864 child
= vd
->vdev_child
[c
];
2867 * Don't factor holes into the decision.
2869 if (child
->vdev_ishole
)
2872 if (!vdev_readable(child
) ||
2873 (!vdev_writeable(child
) && spa_writeable(spa
))) {
2875 * Root special: if there is a top-level log
2876 * device, treat the root vdev as if it were
2879 if (child
->vdev_islog
&& vd
== rvd
)
2883 } else if (child
->vdev_state
<= VDEV_STATE_DEGRADED
) {
2887 if (child
->vdev_stat
.vs_aux
== VDEV_AUX_CORRUPT_DATA
)
2891 vd
->vdev_ops
->vdev_op_state_change(vd
, faulted
, degraded
);
2894 * Root special: if there is a top-level vdev that cannot be
2895 * opened due to corrupted metadata, then propagate the root
2896 * vdev's aux state as 'corrupt' rather than 'insufficient
2899 if (corrupted
&& vd
== rvd
&&
2900 rvd
->vdev_state
== VDEV_STATE_CANT_OPEN
)
2901 vdev_set_state(rvd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2902 VDEV_AUX_CORRUPT_DATA
);
2905 if (vd
->vdev_parent
)
2906 vdev_propagate_state(vd
->vdev_parent
);
2910 * Set a vdev's state. If this is during an open, we don't update the parent
2911 * state, because we're in the process of opening children depth-first.
2912 * Otherwise, we propagate the change to the parent.
2914 * If this routine places a device in a faulted state, an appropriate ereport is
2918 vdev_set_state(vdev_t
*vd
, boolean_t isopen
, vdev_state_t state
, vdev_aux_t aux
)
2920 uint64_t save_state
;
2921 spa_t
*spa
= vd
->vdev_spa
;
2923 if (state
== vd
->vdev_state
) {
2924 vd
->vdev_stat
.vs_aux
= aux
;
2928 save_state
= vd
->vdev_state
;
2930 vd
->vdev_state
= state
;
2931 vd
->vdev_stat
.vs_aux
= aux
;
2934 * If we are setting the vdev state to anything but an open state, then
2935 * always close the underlying device unless the device has requested
2936 * a delayed close (i.e. we're about to remove or fault the device).
2937 * Otherwise, we keep accessible but invalid devices open forever.
2938 * We don't call vdev_close() itself, because that implies some extra
2939 * checks (offline, etc) that we don't want here. This is limited to
2940 * leaf devices, because otherwise closing the device will affect other
2943 if (!vd
->vdev_delayed_close
&& vdev_is_dead(vd
) &&
2944 vd
->vdev_ops
->vdev_op_leaf
)
2945 vd
->vdev_ops
->vdev_op_close(vd
);
2948 * If we have brought this vdev back into service, we need
2949 * to notify fmd so that it can gracefully repair any outstanding
2950 * cases due to a missing device. We do this in all cases, even those
2951 * that probably don't correlate to a repaired fault. This is sure to
2952 * catch all cases, and we let the zfs-retire agent sort it out. If
2953 * this is a transient state it's OK, as the retire agent will
2954 * double-check the state of the vdev before repairing it.
2956 if (state
== VDEV_STATE_HEALTHY
&& vd
->vdev_ops
->vdev_op_leaf
&&
2957 vd
->vdev_prevstate
!= state
)
2958 zfs_post_state_change(spa
, vd
);
2960 if (vd
->vdev_removed
&&
2961 state
== VDEV_STATE_CANT_OPEN
&&
2962 (aux
== VDEV_AUX_OPEN_FAILED
|| vd
->vdev_checkremove
)) {
2964 * If the previous state is set to VDEV_STATE_REMOVED, then this
2965 * device was previously marked removed and someone attempted to
2966 * reopen it. If this failed due to a nonexistent device, then
2967 * keep the device in the REMOVED state. We also let this be if
2968 * it is one of our special test online cases, which is only
2969 * attempting to online the device and shouldn't generate an FMA
2972 vd
->vdev_state
= VDEV_STATE_REMOVED
;
2973 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
2974 } else if (state
== VDEV_STATE_REMOVED
) {
2975 vd
->vdev_removed
= B_TRUE
;
2976 } else if (state
== VDEV_STATE_CANT_OPEN
) {
2978 * If we fail to open a vdev during an import or recovery, we
2979 * mark it as "not available", which signifies that it was
2980 * never there to begin with. Failure to open such a device
2981 * is not considered an error.
2983 if ((spa_load_state(spa
) == SPA_LOAD_IMPORT
||
2984 spa_load_state(spa
) == SPA_LOAD_RECOVER
) &&
2985 vd
->vdev_ops
->vdev_op_leaf
)
2986 vd
->vdev_not_present
= 1;
2989 * Post the appropriate ereport. If the 'prevstate' field is
2990 * set to something other than VDEV_STATE_UNKNOWN, it indicates
2991 * that this is part of a vdev_reopen(). In this case, we don't
2992 * want to post the ereport if the device was already in the
2993 * CANT_OPEN state beforehand.
2995 * If the 'checkremove' flag is set, then this is an attempt to
2996 * online the device in response to an insertion event. If we
2997 * hit this case, then we have detected an insertion event for a
2998 * faulted or offline device that wasn't in the removed state.
2999 * In this scenario, we don't post an ereport because we are
3000 * about to replace the device, or attempt an online with
3001 * vdev_forcefault, which will generate the fault for us.
3003 if ((vd
->vdev_prevstate
!= state
|| vd
->vdev_forcefault
) &&
3004 !vd
->vdev_not_present
&& !vd
->vdev_checkremove
&&
3005 vd
!= spa
->spa_root_vdev
) {
3009 case VDEV_AUX_OPEN_FAILED
:
3010 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED
;
3012 case VDEV_AUX_CORRUPT_DATA
:
3013 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA
;
3015 case VDEV_AUX_NO_REPLICAS
:
3016 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS
;
3018 case VDEV_AUX_BAD_GUID_SUM
:
3019 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM
;
3021 case VDEV_AUX_TOO_SMALL
:
3022 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL
;
3024 case VDEV_AUX_BAD_LABEL
:
3025 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL
;
3028 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN
;
3031 zfs_ereport_post(class, spa
, vd
, NULL
, save_state
, 0);
3034 /* Erase any notion of persistent removed state */
3035 vd
->vdev_removed
= B_FALSE
;
3037 vd
->vdev_removed
= B_FALSE
;
3040 if (!isopen
&& vd
->vdev_parent
)
3041 vdev_propagate_state(vd
->vdev_parent
);
3045 * Check the vdev configuration to ensure that it's capable of supporting
3046 * a root pool. Currently, we do not support RAID-Z or partial configuration.
3047 * In addition, only a single top-level vdev is allowed and none of the leaves
3048 * can be wholedisks.
3051 vdev_is_bootable(vdev_t
*vd
)
3055 if (!vd
->vdev_ops
->vdev_op_leaf
) {
3056 char *vdev_type
= vd
->vdev_ops
->vdev_op_type
;
3058 if (strcmp(vdev_type
, VDEV_TYPE_ROOT
) == 0 &&
3059 vd
->vdev_children
> 1) {
3061 } else if (strcmp(vdev_type
, VDEV_TYPE_RAIDZ
) == 0 ||
3062 strcmp(vdev_type
, VDEV_TYPE_MISSING
) == 0) {
3065 } else if (vd
->vdev_wholedisk
== 1) {
3069 for (c
= 0; c
< vd
->vdev_children
; c
++) {
3070 if (!vdev_is_bootable(vd
->vdev_child
[c
]))
3077 * Load the state from the original vdev tree (ovd) which
3078 * we've retrieved from the MOS config object. If the original
3079 * vdev was offline or faulted then we transfer that state to the
3080 * device in the current vdev tree (nvd).
3083 vdev_load_log_state(vdev_t
*nvd
, vdev_t
*ovd
)
3087 ASSERT(nvd
->vdev_top
->vdev_islog
);
3088 ASSERT(spa_config_held(nvd
->vdev_spa
,
3089 SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
3090 ASSERT3U(nvd
->vdev_guid
, ==, ovd
->vdev_guid
);
3092 for (c
= 0; c
< nvd
->vdev_children
; c
++)
3093 vdev_load_log_state(nvd
->vdev_child
[c
], ovd
->vdev_child
[c
]);
3095 if (nvd
->vdev_ops
->vdev_op_leaf
) {
3097 * Restore the persistent vdev state
3099 nvd
->vdev_offline
= ovd
->vdev_offline
;
3100 nvd
->vdev_faulted
= ovd
->vdev_faulted
;
3101 nvd
->vdev_degraded
= ovd
->vdev_degraded
;
3102 nvd
->vdev_removed
= ovd
->vdev_removed
;
3107 * Determine if a log device has valid content. If the vdev was
3108 * removed or faulted in the MOS config then we know that
3109 * the content on the log device has already been written to the pool.
3112 vdev_log_state_valid(vdev_t
*vd
)
3116 if (vd
->vdev_ops
->vdev_op_leaf
&& !vd
->vdev_faulted
&&
3120 for (c
= 0; c
< vd
->vdev_children
; c
++)
3121 if (vdev_log_state_valid(vd
->vdev_child
[c
]))
3128 * Expand a vdev if possible.
3131 vdev_expand(vdev_t
*vd
, uint64_t txg
)
3133 ASSERT(vd
->vdev_top
== vd
);
3134 ASSERT(spa_config_held(vd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
3136 if ((vd
->vdev_asize
>> vd
->vdev_ms_shift
) > vd
->vdev_ms_count
) {
3137 VERIFY(vdev_metaslab_init(vd
, txg
) == 0);
3138 vdev_config_dirty(vd
);
3146 vdev_split(vdev_t
*vd
)
3148 vdev_t
*cvd
, *pvd
= vd
->vdev_parent
;
3150 vdev_remove_child(pvd
, vd
);
3151 vdev_compact_children(pvd
);
3153 cvd
= pvd
->vdev_child
[0];
3154 if (pvd
->vdev_children
== 1) {
3155 vdev_remove_parent(cvd
);
3156 cvd
->vdev_splitting
= B_TRUE
;
3158 vdev_propagate_state(cvd
);