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34dc7c2f BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
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. | |
7 | * | |
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. | |
12 | * | |
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] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
b128c09f | 22 | * Copyright 2008 Sun Microsystems, Inc. All rights reserved. |
34dc7c2f BB |
23 | * Use is subject to license terms. |
24 | */ | |
25 | ||
34dc7c2f BB |
26 | #include <sys/zfs_context.h> |
27 | #include <sys/spa.h> | |
28 | #include <sys/vdev_impl.h> | |
29 | #include <sys/zio.h> | |
30 | #include <sys/fs/zfs.h> | |
31 | ||
32 | /* | |
33 | * Virtual device vector for the pool's root vdev. | |
34 | */ | |
35 | ||
36 | /* | |
37 | * We should be able to tolerate one failure with absolutely no damage | |
38 | * to our metadata. Two failures will take out space maps, a bunch of | |
39 | * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy | |
40 | * place to live. When we get smarter, we can liberalize this policy. | |
41 | * e.g. If we haven't lost two consecutive top-level vdevs, then we are | |
42 | * probably fine. Adding bean counters during alloc/free can make this | |
43 | * future guesswork more accurate. | |
44 | */ | |
45 | static int | |
46 | too_many_errors(vdev_t *vd, int numerrors) | |
47 | { | |
48 | ASSERT3U(numerrors, <=, vd->vdev_children); | |
b128c09f | 49 | return (numerrors > 0); |
34dc7c2f BB |
50 | } |
51 | ||
52 | static int | |
53 | vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *ashift) | |
54 | { | |
55 | int c; | |
56 | int lasterror = 0; | |
57 | int numerrors = 0; | |
58 | ||
59 | if (vd->vdev_children == 0) { | |
60 | vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; | |
61 | return (EINVAL); | |
62 | } | |
63 | ||
64 | for (c = 0; c < vd->vdev_children; c++) { | |
65 | vdev_t *cvd = vd->vdev_child[c]; | |
66 | int error; | |
67 | ||
b128c09f BB |
68 | if ((error = vdev_open(cvd)) != 0 && |
69 | !cvd->vdev_islog) { | |
34dc7c2f BB |
70 | lasterror = error; |
71 | numerrors++; | |
72 | continue; | |
73 | } | |
74 | } | |
75 | ||
b128c09f BB |
76 | if (too_many_errors(vd, numerrors)) { |
77 | vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS; | |
78 | return (lasterror); | |
34dc7c2f BB |
79 | } |
80 | ||
81 | *asize = 0; | |
82 | *ashift = 0; | |
83 | ||
84 | return (0); | |
85 | } | |
86 | ||
87 | static void | |
88 | vdev_root_close(vdev_t *vd) | |
89 | { | |
90 | int c; | |
91 | ||
92 | for (c = 0; c < vd->vdev_children; c++) | |
93 | vdev_close(vd->vdev_child[c]); | |
94 | } | |
95 | ||
96 | static void | |
97 | vdev_root_state_change(vdev_t *vd, int faulted, int degraded) | |
98 | { | |
b128c09f BB |
99 | if (too_many_errors(vd, faulted)) { |
100 | vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, | |
101 | VDEV_AUX_NO_REPLICAS); | |
34dc7c2f BB |
102 | } else if (degraded) { |
103 | vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE); | |
104 | } else { | |
105 | vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE); | |
106 | } | |
107 | } | |
108 | ||
109 | vdev_ops_t vdev_root_ops = { | |
110 | vdev_root_open, | |
111 | vdev_root_close, | |
34dc7c2f BB |
112 | vdev_default_asize, |
113 | NULL, /* io_start - not applicable to the root */ | |
114 | NULL, /* io_done - not applicable to the root */ | |
115 | vdev_root_state_change, | |
116 | VDEV_TYPE_ROOT, /* name of this vdev type */ | |
117 | B_FALSE /* not a leaf vdev */ | |
118 | }; |