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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.
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.
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]
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #ifndef _SYS_UBERBLOCK_IMPL_H
27 #define _SYS_UBERBLOCK_IMPL_H
29 #pragma ident "@(#)uberblock_impl.h 1.4 07/06/29 SMI"
31 #include <sys/uberblock.h>
38 * The uberblock version is incremented whenever an incompatible on-disk
39 * format change is made to the SPA, DMU, or ZAP.
41 * Note: the first two fields should never be moved. When a storage pool
42 * is opened, the uberblock must be read off the disk before the version
43 * can be checked. If the ub_version field is moved, we may not detect
44 * version mismatch. If the ub_magic field is moved, applications that
45 * expect the magic number in the first word won't work.
47 #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */
48 #define UBERBLOCK_SHIFT 10 /* up to 1K */
51 uint64_t ub_magic
; /* UBERBLOCK_MAGIC */
52 uint64_t ub_version
; /* SPA_VERSION */
53 uint64_t ub_txg
; /* txg of last sync */
54 uint64_t ub_guid_sum
; /* sum of all vdev guids */
55 uint64_t ub_timestamp
; /* UTC time of last sync */
56 blkptr_t ub_rootbp
; /* MOS objset_phys_t */
63 #endif /* _SYS_UBERBLOCK_IMPL_H */