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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2013, 2017 by Delphix. All rights reserved.
24 */
25
26 #include <sys/zfs_context.h>
27 #include <sys/uberblock_impl.h>
28 #include <sys/vdev_impl.h>
29 #include <sys/mmp.h>
30
31 int
uberblock_verify(uberblock_t * ub)32 uberblock_verify(uberblock_t *ub)
33 {
34 if (ub->ub_magic == BSWAP_64((uint64_t)UBERBLOCK_MAGIC))
35 byteswap_uint64_array(ub, sizeof (uberblock_t));
36
37 if (ub->ub_magic != UBERBLOCK_MAGIC)
38 return (SET_ERROR(EINVAL));
39
40 return (0);
41 }
42
43 /*
44 * Update the uberblock and return TRUE if anything changed in this
45 * transaction group.
46 */
47 boolean_t
uberblock_update(uberblock_t * ub,vdev_t * rvd,uint64_t txg,uint64_t mmp_delay)48 uberblock_update(uberblock_t *ub, vdev_t *rvd, uint64_t txg, uint64_t mmp_delay)
49 {
50 ASSERT(ub->ub_txg < txg);
51
52 /*
53 * We explicitly do not set ub_version here, so that older versions
54 * continue to be written with the previous uberblock version.
55 */
56 ub->ub_magic = UBERBLOCK_MAGIC;
57 ub->ub_txg = txg;
58 ub->ub_guid_sum = rvd->vdev_guid_sum;
59 ub->ub_timestamp = gethrestime_sec();
60 ub->ub_software_version = SPA_VERSION;
61 ub->ub_mmp_magic = MMP_MAGIC;
62 if (spa_multihost(rvd->vdev_spa)) {
63 ub->ub_mmp_delay = mmp_delay;
64 ub->ub_mmp_config = MMP_SEQ_SET(0) |
65 MMP_INTERVAL_SET(zfs_multihost_interval) |
66 MMP_FAIL_INT_SET(zfs_multihost_fail_intervals);
67 } else {
68 ub->ub_mmp_delay = 0;
69 ub->ub_mmp_config = 0;
70 }
71 ub->ub_checkpoint_txg = 0;
72
73 return (ub->ub_rootbp.blk_birth == txg);
74 }
75