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/*
* 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.
*/
#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 (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);
}