1b1b8ab3lling/*
2b1b8ab3lling *  GRUB  --  GRand Unified Bootloader
3b1b8ab3lling *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
4b1b8ab3lling *
5b1b8ab3lling *  This program is free software; you can redistribute it and/or modify
6b1b8ab3lling *  it under the terms of the GNU General Public License as published by
7b1b8ab3lling *  the Free Software Foundation; either version 2 of the License, or
8b1b8ab3lling *  (at your option) any later version.
9b1b8ab3lling *
10b1b8ab3lling *  This program is distributed in the hope that it will be useful,
11b1b8ab3lling *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12b1b8ab3lling *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13b1b8ab3lling *  GNU General Public License for more details.
14b1b8ab3lling *
15b1b8ab3lling *  You should have received a copy of the GNU General Public License
16b1b8ab3lling *  along with this program; if not, write to the Free Software
17b1b8ab3lling *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18b1b8ab3lling */
19b1b8ab3lling/*
20b1b8ab3lling * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
21b1b8ab3lling * Use is subject to license terms.
22b1b8ab3lling */
23b1b8ab3lling
24b1b8ab3lling#ifndef _SYS_UBERBLOCK_IMPL_H
25b1b8ab3lling#define	_SYS_UBERBLOCK_IMPL_H
26b1b8ab3lling
27b1b8ab3lling#pragma ident	"%Z%%M%	%I%	%E% SMI"
28b1b8ab3lling
29b1b8ab3lling/*
30b1b8ab3lling * The uberblock version is incremented whenever an incompatible on-disk
31b1b8ab3lling * format change is made to the SPA, DMU, or ZAP.
32b1b8ab3lling *
33b1b8ab3lling * Note: the first two fields should never be moved.  When a storage pool
34b1b8ab3lling * is opened, the uberblock must be read off the disk before the version
35b1b8ab3lling * can be checked.  If the ub_version field is moved, we may not detect
36b1b8ab3lling * version mismatch.  If the ub_magic field is moved, applications that
37b1b8ab3lling * expect the magic number in the first word won't work.
38b1b8ab3lling */
39b1b8ab3lling#define	UBERBLOCK_MAGIC		0x00bab10c		/* oo-ba-bloc!	*/
40b1b8ab3lling#define	UBERBLOCK_SHIFT		10			/* up to 1K	*/
41b1b8ab3lling
42b1b8ab3llingstruct uberblock {
43b1b8ab3lling	uint64_t	ub_magic;	/* UBERBLOCK_MAGIC		*/
44b1b8ab3lling	uint64_t	ub_version;	/* ZFS_VERSION			*/
45b1b8ab3lling	uint64_t	ub_txg;		/* txg of last sync		*/
46b1b8ab3lling	uint64_t	ub_guid_sum;	/* sum of all vdev guids	*/
47b1b8ab3lling	uint64_t	ub_timestamp;	/* UTC time of last sync	*/
48b1b8ab3lling	blkptr_t	ub_rootbp;	/* MOS objset_phys_t		*/
49b1b8ab3lling};
50b1b8ab3lling
51b1b8ab3lling#endif	/* _SYS_UBERBLOCK_IMPL_H */
52