1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2013, 2017 by Delphix. All rights reserved.
25 */
26
27 #include <sys/zfs_context.h>
28 #include <sys/uberblock_impl.h>
29 #include <sys/vdev_impl.h>
30 #include <sys/mmp.h>
31
32 int
uberblock_verify(uberblock_t * ub)33 uberblock_verify(uberblock_t *ub)
34 {
35 if (ub->ub_magic == BSWAP_64((uint64_t)UBERBLOCK_MAGIC))
36 byteswap_uint64_array(ub, sizeof (uberblock_t));
37
38 if (ub->ub_magic != UBERBLOCK_MAGIC)
39 return (SET_ERROR(EINVAL));
40
41 return (0);
42 }
43
44 /*
45 * Update the uberblock and return TRUE if anything changed in this
46 * transaction group.
47 */
48 boolean_t
uberblock_update(uberblock_t * ub,vdev_t * rvd,uint64_t txg,uint64_t mmp_delay)49 uberblock_update(uberblock_t *ub, vdev_t *rvd, uint64_t txg, uint64_t mmp_delay)
50 {
51 ASSERT(ub->ub_txg < txg);
52
53 /*
54 * We explicitly do not set ub_version here, so that older versions
55 * continue to be written with the previous uberblock version.
56 */
57 ub->ub_magic = UBERBLOCK_MAGIC;
58 ub->ub_txg = txg;
59 ub->ub_guid_sum = rvd->vdev_guid_sum;
60 ub->ub_timestamp = gethrestime_sec();
61 ub->ub_software_version = SPA_VERSION;
62 ub->ub_mmp_magic = MMP_MAGIC;
63 if (spa_multihost(rvd->vdev_spa)) {
64 ub->ub_mmp_delay = mmp_delay;
65 ub->ub_mmp_config = MMP_SEQ_SET(0) |
66 MMP_INTERVAL_SET(zfs_multihost_interval) |
67 MMP_FAIL_INT_SET(zfs_multihost_fail_intervals);
68 } else {
69 ub->ub_mmp_delay = 0;
70 ub->ub_mmp_config = 0;
71 }
72 ub->ub_checkpoint_txg = 0;
73
74 return (BP_GET_LOGICAL_BIRTH(&ub->ub_rootbp) == txg);
75 }
76