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 * The 'missing' vdev is a special vdev type used only during import.  It
28 * signifies a placeholder in the root vdev for some vdev that we know is
29 * missing.  We pass it down to the kernel to allow the rest of the
30 * configuration to parsed and an attempt made to open all available devices.
31 * Because its GUID is always 0, we know that the guid sum will mismatch and we
32 * won't be able to open the pool anyway.
33 */
34
35#include <sys/zfs_context.h>
36#include <sys/spa.h>
37#include <sys/vdev_impl.h>
38#include <sys/fs/zfs.h>
39#include <sys/zio.h>
40
41/* ARGSUSED */
42static int
43vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
44{
45	/*
46	 * Really this should just fail.  But then the root vdev will be in the
47	 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is
48	 * VDEV_AUX_BAD_GUID_SUM.  So we pretend to succeed, knowing that we
49	 * will fail the GUID sum check before ever trying to open the pool.
50	 */
51	*psize = 0;
52	*ashift = 0;
53	return (0);
54}
55
56/* ARGSUSED */
57static void
58vdev_missing_close(vdev_t *vd)
59{
60}
61
62/* ARGSUSED */
63static int
64vdev_missing_io_start(zio_t *zio)
65{
66	zio->io_error = ENOTSUP;
67	return (ZIO_PIPELINE_CONTINUE);
68}
69
70/* ARGSUSED */
71static void
72vdev_missing_io_done(zio_t *zio)
73{
74}
75
76vdev_ops_t vdev_missing_ops = {
77	vdev_missing_open,
78	vdev_missing_close,
79	vdev_default_asize,
80	vdev_missing_io_start,
81	vdev_missing_io_done,
82	NULL,
83	NULL,
84	NULL,
85	VDEV_TYPE_MISSING,	/* name of this vdev type */
86	B_TRUE			/* leaf vdev */
87};
88
89vdev_ops_t vdev_hole_ops = {
90	vdev_missing_open,
91	vdev_missing_close,
92	vdev_default_asize,
93	vdev_missing_io_start,
94	vdev_missing_io_done,
95	NULL,
96	NULL,
97	NULL,
98	VDEV_TYPE_HOLE,		/* name of this vdev type */
99	B_TRUE			/* leaf vdev */
100};
101