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]
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
27 * Copyright (c) 2013 by Delphix. All rights reserved.
30 #include <sys/zfs_context.h>
32 #include <sys/vdev_impl.h>
34 #include <sys/fs/zfs.h>
37 * Virtual device vector for the pool's root vdev.
41 * We should be able to tolerate one failure with absolutely no damage
42 * to our metadata. Two failures will take out space maps, a bunch of
43 * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy
44 * place to live. When we get smarter, we can liberalize this policy.
45 * e.g. If we haven't lost two consecutive top-level vdevs, then we are
46 * probably fine. Adding bean counters during alloc/free can make this
47 * future guesswork more accurate.
50 too_many_errors(vdev_t
*vd
, int numerrors
)
52 ASSERT3U(numerrors
, <=, vd
->vdev_children
);
53 return (numerrors
> 0);
57 vdev_root_open(vdev_t
*vd
, uint64_t *asize
, uint64_t *max_asize
,
63 if (vd
->vdev_children
== 0) {
64 vd
->vdev_stat
.vs_aux
= VDEV_AUX_BAD_LABEL
;
65 return (SET_ERROR(EINVAL
));
68 vdev_open_children(vd
);
70 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
71 vdev_t
*cvd
= vd
->vdev_child
[c
];
73 if (cvd
->vdev_open_error
&& !cvd
->vdev_islog
) {
74 lasterror
= cvd
->vdev_open_error
;
79 if (too_many_errors(vd
, numerrors
)) {
80 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NO_REPLICAS
;
92 vdev_root_close(vdev_t
*vd
)
94 for (int c
= 0; c
< vd
->vdev_children
; c
++)
95 vdev_close(vd
->vdev_child
[c
]);
99 vdev_root_state_change(vdev_t
*vd
, int faulted
, int degraded
)
101 if (too_many_errors(vd
, faulted
)) {
102 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
103 VDEV_AUX_NO_REPLICAS
);
104 } else if (degraded
) {
105 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
, VDEV_AUX_NONE
);
107 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_HEALTHY
, VDEV_AUX_NONE
);
111 vdev_ops_t vdev_root_ops
= {
115 NULL
, /* io_start - not applicable to the root */
116 NULL
, /* io_done - not applicable to the root */
117 vdev_root_state_change
,
120 VDEV_TYPE_ROOT
, /* name of this vdev type */
121 B_FALSE
/* not a leaf vdev */