/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#ifndef _SYS_UBERBLOCK_IMPL_H

#define	_SYS_UBERBLOCK_IMPL_H

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/uberblock.h>

#ifdef	__cplusplus

extern "C" {

#endif

/*

 * The uberblock version is incremented whenever an incompatible on-disk

 * format change is made to the SPA, DMU, or ZAP.

 *

 * Note: the first two fields should never be moved.  When a storage pool

 * is opened, the uberblock must be read off the disk before the version

 * can be checked.  If the ub_version field is moved, we may not detect

 * version mismatch.  If the ub_magic field is moved, applications that

 * expect the magic number in the first word won't work.

 */

#define	UBERBLOCK_MAGIC		0x00bab10c		/* oo-ba-bloc!	*/

#define	UBERBLOCK_SHIFT		10			/* up to 1K	*/

struct uberblock {

	uint64_t	ub_magic;	/* UBERBLOCK_MAGIC		*/

	uint64_t	ub_version;	/* ZFS_VERSION			*/

	uint64_t	ub_txg;		/* txg of last sync		*/

	uint64_t	ub_guid_sum;	/* sum of all vdev guids	*/

	uint64_t	ub_timestamp;	/* UTC time of last sync	*/

	blkptr_t	ub_rootbp;	/* MOS objset_phys_t		*/

};

#ifdef	__cplusplus

}

#endif

#endif	/* _SYS_UBERBLOCK_IMPL_H */