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, 2016 by Delphix. All rights reserved.
28 * Copyright 2019 Joyent, Inc.
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 /* ARGSUSED */
47 static int
vdev_missing_open(vdev_t * vd,uint64_t * psize,uint64_t * max_psize,uint64_t * ashift)48 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
49 uint64_t *ashift)
50 {
51 /*
52 * Really this should just fail. But then the root vdev will be in the
53 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is
54 * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we
55 * will fail the GUID sum check before ever trying to open the pool.
56 */
57 *psize = 0;
58 *max_psize = 0;
59 *ashift = 0;
60 return (0);
61 }
62
63 /* ARGSUSED */
64 static void
vdev_missing_close(vdev_t * vd)65 vdev_missing_close(vdev_t *vd)
66 {
67 }
68
69 /* ARGSUSED */
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 /* ARGSUSED */
78 static void
vdev_missing_io_done(zio_t * zio)79 vdev_missing_io_done(zio_t *zio)
80 {
81 }
82
83 vdev_ops_t vdev_missing_ops = {
84 .vdev_op_open = vdev_missing_open,
85 .vdev_op_close = vdev_missing_close,
86 .vdev_op_asize = vdev_default_asize,
87 .vdev_op_io_start = vdev_missing_io_start,
88 .vdev_op_io_done = vdev_missing_io_done,
89 .vdev_op_state_change = NULL,
90 .vdev_op_need_resilver = NULL,
91 .vdev_op_hold = NULL,
92 .vdev_op_rele = NULL,
93 .vdev_op_remap = NULL,
94 .vdev_op_xlate = NULL,
95 .vdev_op_dumpio = NULL,
96 .vdev_op_type = VDEV_TYPE_MISSING, /* name of this vdev type */
97 .vdev_op_leaf = B_TRUE /* leaf vdev */
98 };
99
100 vdev_ops_t vdev_hole_ops = {
101 .vdev_op_open = vdev_missing_open,
102 .vdev_op_close = vdev_missing_close,
103 .vdev_op_asize = vdev_default_asize,
104 .vdev_op_io_start = vdev_missing_io_start,
105 .vdev_op_io_done = vdev_missing_io_done,
106 .vdev_op_state_change = NULL,
107 .vdev_op_need_resilver = NULL,
108 .vdev_op_hold = NULL,
109 .vdev_op_rele = NULL,
110 .vdev_op_remap = NULL,
111 .vdev_op_xlate = NULL,
112 .vdev_op_dumpio = NULL,
113 .vdev_op_type = VDEV_TYPE_HOLE, /* name of this vdev type */
114 .vdev_op_leaf = B_TRUE /* leaf vdev */
115 };
116