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/*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*
27 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
28 */
29
30#include <sys/zfs_context.h>
31#include <sys/spa.h>
32#include <sys/vdev_impl.h>
33#include <sys/zio.h>
34#include <sys/fs/zfs.h>
35
36/*
37 * Virtual device vector for the pool's root vdev.
38 */
39
40static uint64_t
41vdev_root_core_tvds(vdev_t *vd)
42{
43 uint64_t tvds = 0;
44
45 for (uint64_t c = 0; c < vd->vdev_children; c++) {
46 vdev_t *cvd = vd->vdev_child[c];
47
48 if (!cvd->vdev_ishole && !cvd->vdev_islog &&
49 cvd->vdev_ops != &vdev_indirect_ops) {
50 tvds++;
51 }
52 }
53
54 return (tvds);
55}
56
57/*
58 * We should be able to tolerate one failure with absolutely no damage
59 * to our metadata. Two failures will take out space maps, a bunch of
60 * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy
61 * place to live. When we get smarter, we can liberalize this policy.
62 * e.g. If we haven't lost two consecutive top-level vdevs, then we are
63 * probably fine. Adding bean counters during alloc/free can make this
64 * future guesswork more accurate.
65 */
66static boolean_t
67too_many_errors(vdev_t *vd, uint64_t numerrors)
68{
69 uint64_t tvds;
70
71 if (numerrors == 0)
72 return (B_FALSE);
73
74 tvds = vdev_root_core_tvds(vd);
75 ASSERT3U(numerrors, <=, tvds);
76
77 if (numerrors == tvds)
78 return (B_TRUE);
79
80 return (numerrors > spa_missing_tvds_allowed(vd->vdev_spa));
81}
82
83static int
84vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *max_asize,
85 uint64_t *logical_ashift, uint64_t *physical_ashift)
86{
87 spa_t *spa = vd->vdev_spa;
88 int lasterror = 0;
89 int numerrors = 0;
90
91 if (vd->vdev_children == 0) {
92 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
93 return (SET_ERROR(EINVAL));
94 }
95
96 vdev_open_children(vd);
97
98 for (int c = 0; c < vd->vdev_children; c++) {
99 vdev_t *cvd = vd->vdev_child[c];
100
101 if (cvd->vdev_open_error && !cvd->vdev_islog) {
102 lasterror = cvd->vdev_open_error;
103 numerrors++;
104 }
105 }
106
107 if (spa_load_state(spa) != SPA_LOAD_NONE)
108 spa_set_missing_tvds(spa, numerrors);
109
110 if (too_many_errors(vd, numerrors)) {
111 vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;
112 return (lasterror);
113 }
114
115 *asize = 0;
116 *max_asize = 0;
117 *logical_ashift = 0;
118 *physical_ashift = 0;
119
120 return (0);
121}
122
123static void
124vdev_root_close(vdev_t *vd)
125{
126 for (int c = 0; c < vd->vdev_children; c++)
127 vdev_close(vd->vdev_child[c]);
128}
129
130static void
131vdev_root_state_change(vdev_t *vd, int faulted, int degraded)
132{
133 if (too_many_errors(vd, faulted)) {
134 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
135 VDEV_AUX_NO_REPLICAS);
136 } else if (degraded || faulted) {
137 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
138 } else {
139 vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);
140 }
141}
142
143vdev_ops_t vdev_root_ops = {
144 vdev_root_open,
145 vdev_root_close,
146 vdev_default_asize,
147 NULL, /* io_start - not applicable to the root */
148 NULL, /* io_done - not applicable to the root */
149 vdev_root_state_change,
150 NULL,
151 NULL,
152 NULL,
| 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/*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*
27 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
28 */
29
30#include <sys/zfs_context.h>
31#include <sys/spa.h>
32#include <sys/vdev_impl.h>
33#include <sys/zio.h>
34#include <sys/fs/zfs.h>
35
36/*
37 * Virtual device vector for the pool's root vdev.
38 */
39
40static uint64_t
41vdev_root_core_tvds(vdev_t *vd)
42{
43 uint64_t tvds = 0;
44
45 for (uint64_t c = 0; c < vd->vdev_children; c++) {
46 vdev_t *cvd = vd->vdev_child[c];
47
48 if (!cvd->vdev_ishole && !cvd->vdev_islog &&
49 cvd->vdev_ops != &vdev_indirect_ops) {
50 tvds++;
51 }
52 }
53
54 return (tvds);
55}
56
57/*
58 * We should be able to tolerate one failure with absolutely no damage
59 * to our metadata. Two failures will take out space maps, a bunch of
60 * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy
61 * place to live. When we get smarter, we can liberalize this policy.
62 * e.g. If we haven't lost two consecutive top-level vdevs, then we are
63 * probably fine. Adding bean counters during alloc/free can make this
64 * future guesswork more accurate.
65 */
66static boolean_t
67too_many_errors(vdev_t *vd, uint64_t numerrors)
68{
69 uint64_t tvds;
70
71 if (numerrors == 0)
72 return (B_FALSE);
73
74 tvds = vdev_root_core_tvds(vd);
75 ASSERT3U(numerrors, <=, tvds);
76
77 if (numerrors == tvds)
78 return (B_TRUE);
79
80 return (numerrors > spa_missing_tvds_allowed(vd->vdev_spa));
81}
82
83static int
84vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *max_asize,
85 uint64_t *logical_ashift, uint64_t *physical_ashift)
86{
87 spa_t *spa = vd->vdev_spa;
88 int lasterror = 0;
89 int numerrors = 0;
90
91 if (vd->vdev_children == 0) {
92 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
93 return (SET_ERROR(EINVAL));
94 }
95
96 vdev_open_children(vd);
97
98 for (int c = 0; c < vd->vdev_children; c++) {
99 vdev_t *cvd = vd->vdev_child[c];
100
101 if (cvd->vdev_open_error && !cvd->vdev_islog) {
102 lasterror = cvd->vdev_open_error;
103 numerrors++;
104 }
105 }
106
107 if (spa_load_state(spa) != SPA_LOAD_NONE)
108 spa_set_missing_tvds(spa, numerrors);
109
110 if (too_many_errors(vd, numerrors)) {
111 vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;
112 return (lasterror);
113 }
114
115 *asize = 0;
116 *max_asize = 0;
117 *logical_ashift = 0;
118 *physical_ashift = 0;
119
120 return (0);
121}
122
123static void
124vdev_root_close(vdev_t *vd)
125{
126 for (int c = 0; c < vd->vdev_children; c++)
127 vdev_close(vd->vdev_child[c]);
128}
129
130static void
131vdev_root_state_change(vdev_t *vd, int faulted, int degraded)
132{
133 if (too_many_errors(vd, faulted)) {
134 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
135 VDEV_AUX_NO_REPLICAS);
136 } else if (degraded || faulted) {
137 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
138 } else {
139 vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);
140 }
141}
142
143vdev_ops_t vdev_root_ops = {
144 vdev_root_open,
145 vdev_root_close,
146 vdev_default_asize,
147 NULL, /* io_start - not applicable to the root */
148 NULL, /* io_done - not applicable to the root */
149 vdev_root_state_change,
150 NULL,
151 NULL,
152 NULL,
|