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 /*
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 /* ARGSUSED */
46 static int
vdev_missing_open(vdev_t * vd,uint64_t * psize,uint64_t * max_psize,uint64_t * logical_ashift,uint64_t * physical_ashift)47 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
48 uint64_t *logical_ashift, uint64_t *physical_ashift)
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 *psize = 0;
57 *max_psize = 0;
58 *logical_ashift = 0;
59 *physical_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_missing_open,
85 vdev_missing_close,
86 vdev_default_asize,
87 vdev_missing_io_start,
88 vdev_missing_io_done,
89 NULL,
90 NULL,
91 NULL,
92 VDEV_TYPE_MISSING, /* name of this vdev type */
93 B_TRUE /* leaf vdev */
94 };
95
96 vdev_ops_t vdev_hole_ops = {
97 vdev_missing_open,
98 vdev_missing_close,
99 vdev_default_asize,
100 vdev_missing_io_start,
101 vdev_missing_io_done,
102 NULL,
103 NULL,
104 NULL,
105 VDEV_TYPE_HOLE, /* name of this vdev type */
106 B_TRUE /* leaf vdev */
107 };
108