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 https://opensource.org/licenses/CDDL-1.0.
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, 2016 by Delphix. All rights reserved.
28 */
29
30 /*
31 * The 'missing' vdev is a special vdev type used only during import. It
32 * signifies a placeholder in the root vdev for some vdev that we know is
33 * missing. We pass it down to the kernel to allow the rest of the
34 * configuration to parsed and an attempt made to open all available devices.
35 * Because its GUID is always 0, we know that the guid sum will mismatch and we
36 * won't be able to open the pool anyway.
37 */
38
39 #include <sys/zfs_context.h>
40 #include <sys/spa.h>
41 #include <sys/vdev_impl.h>
42 #include <sys/fs/zfs.h>
43 #include <sys/zio.h>
44
45 static int
vdev_missing_open(vdev_t * vd,uint64_t * psize,uint64_t * max_psize,uint64_t * ashift,uint64_t * pshift)46 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
47 uint64_t *ashift, uint64_t *pshift)
48 {
49 /*
50 * Really this should just fail. But then the root vdev will be in the
51 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is
52 * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we
53 * will fail the GUID sum check before ever trying to open the pool.
54 */
55 (void) vd;
56 *psize = 0;
57 *max_psize = 0;
58 *ashift = 0;
59 *pshift = 0;
60 return (0);
61 }
62
63 static void
vdev_missing_close(vdev_t * vd)64 vdev_missing_close(vdev_t *vd)
65 {
66 (void) vd;
67 }
68
69 static void
vdev_missing_io_start(zio_t * zio)70 vdev_missing_io_start(zio_t *zio)
71 {
72 zio->io_error = SET_ERROR(ENOTSUP);
73 zio_execute(zio);
74 }
75
76 static void
vdev_missing_io_done(zio_t * zio)77 vdev_missing_io_done(zio_t *zio)
78 {
79 (void) zio;
80 }
81
82 vdev_ops_t vdev_missing_ops = {
83 .vdev_op_init = NULL,
84 .vdev_op_fini = NULL,
85 .vdev_op_open = vdev_missing_open,
86 .vdev_op_close = vdev_missing_close,
87 .vdev_op_asize = vdev_default_asize,
88 .vdev_op_min_asize = vdev_default_min_asize,
89 .vdev_op_min_alloc = NULL,
90 .vdev_op_io_start = vdev_missing_io_start,
91 .vdev_op_io_done = vdev_missing_io_done,
92 .vdev_op_state_change = NULL,
93 .vdev_op_need_resilver = NULL,
94 .vdev_op_hold = NULL,
95 .vdev_op_rele = NULL,
96 .vdev_op_remap = NULL,
97 .vdev_op_xlate = NULL,
98 .vdev_op_rebuild_asize = NULL,
99 .vdev_op_metaslab_init = NULL,
100 .vdev_op_config_generate = NULL,
101 .vdev_op_nparity = NULL,
102 .vdev_op_ndisks = NULL,
103 .vdev_op_type = VDEV_TYPE_MISSING, /* name of this vdev type */
104 .vdev_op_leaf = B_TRUE /* leaf vdev */
105 };
106
107 vdev_ops_t vdev_hole_ops = {
108 .vdev_op_init = NULL,
109 .vdev_op_fini = NULL,
110 .vdev_op_open = vdev_missing_open,
111 .vdev_op_close = vdev_missing_close,
112 .vdev_op_asize = vdev_default_asize,
113 .vdev_op_min_asize = vdev_default_min_asize,
114 .vdev_op_min_alloc = NULL,
115 .vdev_op_io_start = vdev_missing_io_start,
116 .vdev_op_io_done = vdev_missing_io_done,
117 .vdev_op_state_change = NULL,
118 .vdev_op_need_resilver = NULL,
119 .vdev_op_hold = NULL,
120 .vdev_op_rele = NULL,
121 .vdev_op_remap = NULL,
122 .vdev_op_xlate = NULL,
123 .vdev_op_rebuild_asize = NULL,
124 .vdev_op_metaslab_init = NULL,
125 .vdev_op_config_generate = NULL,
126 .vdev_op_nparity = NULL,
127 .vdev_op_ndisks = NULL,
128 .vdev_op_type = VDEV_TYPE_HOLE, /* name of this vdev type */
129 .vdev_op_leaf = B_TRUE /* leaf vdev */
130 };
131