/*

 * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2013 by Delphix. All rights reserved.

 */

#include <sys/zfs_context.h>

#include <sys/uberblock_impl.h>

#include <sys/vdev_impl.h>

int

uberblock_verify(uberblock_t *ub)

{

	if (ub->ub_magic == BSWAP_64((uint64_t)UBERBLOCK_MAGIC))

		byteswap_uint64_array(ub, sizeof (uberblock_t));

	if (ub->ub_magic != UBERBLOCK_MAGIC)

		return (SET_ERROR(EINVAL));

	return (0);

}

/*

 * Update the uberblock and return a boolean value indicating whether

 * anything changed in this transaction group.

 */

int

uberblock_update(uberblock_t *ub, vdev_t *rvd, uint64_t txg)

{

	ASSERT(ub->ub_txg < txg);

	/*

	 * We explicitly do not set ub_version here, so that older versions

	 * continue to be written with the previous uberblock version.

	 */

	ub->ub_magic = UBERBLOCK_MAGIC;

	ub->ub_txg = txg;

	ub->ub_guid_sum = rvd->vdev_guid_sum;

	ub->ub_timestamp = gethrestime_sec();

	ub->ub_software_version = SPA_VERSION;

	return (ub->ub_rootbp.blk_birth == txg);

}