uberblock.c revision fa9e4066f08beec538e775443c5be79dd423fcab
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/zfs_context.h>
#include <sys/uberblock_impl.h>
#include <sys/vdev_impl.h>
/* Keep the uberblock version in a varialbe so we can get at it with mdb */
static uint64_t uberblock_version = UBERBLOCK_VERSION;
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);
if (ub->ub_version != UBERBLOCK_VERSION)
return (ENOTSUP);
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);
ub->ub_magic = UBERBLOCK_MAGIC;
ub->ub_version = UBERBLOCK_VERSION;
ub->ub_txg = txg;
ub->ub_guid_sum = rvd->vdev_guid_sum;
ub->ub_timestamp = gethrestime_sec();
return (ub->ub_rootbp.blk_birth == txg);
}