1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
29 */
30
31 /*
32 * The 'missing' vdev is a special vdev type used only during import. It
33 * signifies a placeholder in the root vdev for some vdev that we know is
34 * missing. We pass it down to the kernel to allow the rest of the
35 * configuration to parsed and an attempt made to open all available devices.
36 * Because its GUID is always 0, we know that the guid sum will mismatch and we
37 * won't be able to open the pool anyway.
38 */
39
40 #include <sys/zfs_context.h>
41 #include <sys/spa.h>
42 #include <sys/vdev_impl.h>
43 #include <sys/fs/zfs.h>
44 #include <sys/zio.h>
45
46 static int
vdev_missing_open(vdev_t * vd,uint64_t * psize,uint64_t * max_psize,uint64_t * ashift,uint64_t * pshift)47 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
48 uint64_t *ashift, uint64_t *pshift)
49 {
50 /*
51 * Really this should just fail. But then the root vdev will be in the
52 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is
53 * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we
54 * will fail the GUID sum check before ever trying to open the pool.
55 */
56 (void) vd;
57 *psize = 0;
58 *max_psize = 0;
59 *ashift = 0;
60 *pshift = 0;
61 return (0);
62 }
63
64 static void
vdev_missing_close(vdev_t * vd)65 vdev_missing_close(vdev_t *vd)
66 {
67 (void) vd;
68 }
69
70 static void
vdev_missing_io_start(zio_t * zio)71 vdev_missing_io_start(zio_t *zio)
72 {
73 zio->io_error = SET_ERROR(ENOTSUP);
74 zio_execute(zio);
75 }
76
77 static void
vdev_missing_io_done(zio_t * zio)78 vdev_missing_io_done(zio_t *zio)
79 {
80 (void) zio;
81 }
82
83 vdev_ops_t vdev_missing_ops = {
84 .vdev_op_init = NULL,
85 .vdev_op_fini = NULL,
86 .vdev_op_open = vdev_missing_open,
87 .vdev_op_close = vdev_missing_close,
88 .vdev_op_asize = vdev_default_asize,
89 .vdev_op_min_asize = vdev_default_min_asize,
90 .vdev_op_min_alloc = NULL,
91 .vdev_op_io_start = vdev_missing_io_start,
92 .vdev_op_io_done = vdev_missing_io_done,
93 .vdev_op_state_change = NULL,
94 .vdev_op_need_resilver = NULL,
95 .vdev_op_hold = NULL,
96 .vdev_op_rele = NULL,
97 .vdev_op_remap = NULL,
98 .vdev_op_xlate = NULL,
99 .vdev_op_rebuild_asize = NULL,
100 .vdev_op_metaslab_init = NULL,
101 .vdev_op_config_generate = NULL,
102 .vdev_op_nparity = NULL,
103 .vdev_op_ndisks = NULL,
104 .vdev_op_type = VDEV_TYPE_MISSING, /* name of this vdev type */
105 .vdev_op_leaf = B_TRUE /* leaf vdev */
106 };
107
108 vdev_ops_t vdev_hole_ops = {
109 .vdev_op_init = NULL,
110 .vdev_op_fini = NULL,
111 .vdev_op_open = vdev_missing_open,
112 .vdev_op_close = vdev_missing_close,
113 .vdev_op_asize = vdev_default_asize,
114 .vdev_op_min_asize = vdev_default_min_asize,
115 .vdev_op_min_alloc = NULL,
116 .vdev_op_io_start = vdev_missing_io_start,
117 .vdev_op_io_done = vdev_missing_io_done,
118 .vdev_op_state_change = NULL,
119 .vdev_op_need_resilver = NULL,
120 .vdev_op_hold = NULL,
121 .vdev_op_rele = NULL,
122 .vdev_op_remap = NULL,
123 .vdev_op_xlate = NULL,
124 .vdev_op_rebuild_asize = NULL,
125 .vdev_op_metaslab_init = NULL,
126 .vdev_op_config_generate = NULL,
127 .vdev_op_nparity = NULL,
128 .vdev_op_ndisks = NULL,
129 .vdev_op_type = VDEV_TYPE_HOLE, /* name of this vdev type */
130 .vdev_op_leaf = B_TRUE /* leaf vdev */
131 };
132