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 */
24
25#ifndef _SYS_UBERBLOCK_IMPL_H
26#define _SYS_UBERBLOCK_IMPL_H
27
28#include <sys/uberblock.h>
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34/*
35 * The uberblock version is incremented whenever an incompatible on-disk
36 * format change is made to the SPA, DMU, or ZAP.
37 *
38 * Note: the first two fields should never be moved. When a storage pool
39 * is opened, the uberblock must be read off the disk before the version
40 * can be checked. If the ub_version field is moved, we may not detect
41 * version mismatch. If the ub_magic field is moved, applications that
42 * expect the magic number in the first word won't work.
43 */
44#define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */
45#define UBERBLOCK_SHIFT 10 /* up to 1K */
46
47struct uberblock {
48 uint64_t ub_magic; /* UBERBLOCK_MAGIC */
49 uint64_t ub_version; /* SPA_VERSION */
50 uint64_t ub_txg; /* txg of last sync */
51 uint64_t ub_guid_sum; /* sum of all vdev guids */
52 uint64_t ub_timestamp; /* UTC time of last sync */
53 blkptr_t ub_rootbp; /* MOS objset_phys_t */
54
55 /* highest SPA_VERSION supported by software that wrote this txg */
56 uint64_t ub_software_version;
57};
58
59#ifdef __cplusplus
60}
61#endif
62
63#endif /* _SYS_UBERBLOCK_IMPL_H */
64