[mirror_ubuntu-bionic-kernel.git] / zfs / module / zfs / uberblock.c

/*
 * 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, 2014 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 TRUE if anything changed in this
 * transaction group.
 */
boolean_t
uberblock_update(uberblock_t *ub, vdev_t *rvd, uint64_t txg, uint64_t mmp_delay)
{
	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;
	ub->ub_mmp_magic = MMP_MAGIC;
	ub->ub_mmp_delay = spa_multihost(rvd->vdev_spa) ? mmp_delay : 0;
	ub->ub_mmp_seq = 0;

	return (ub->ub_rootbp.blk_birth == txg);
}
Commit	Line	Data
70e083d2 TG	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
	5	* Common Development and Distribution License (the "License").
	6	* You may not use this file except in compliance with the License.
	7	*
	8	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	9	* or http://www.opensolaris.org/os/licensing.
	10	* See the License for the specific language governing permissions
	11	* and limitations under the License.
	12	*
	13	* When distributing Covered Code, include this CDDL HEADER in each
	14	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	15	* If applicable, add the following below this CDDL HEADER, with the
	16	* fields enclosed by brackets "[]" replaced with your own identifying
	17	* information: Portions Copyright [yyyy] [name of copyright owner]
	18	*
	19	* CDDL HEADER END
	20	*/
	21	/*
	22	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	23	* Copyright (c) 2013, 2014 by Delphix. All rights reserved.
	24	*/
	25
	26	#include <sys/zfs_context.h>
	27	#include <sys/uberblock_impl.h>
	28	#include <sys/vdev_impl.h>
	29
	30	int
	31	uberblock_verify(uberblock_t *ub)
	32	{
	33	if (ub->ub_magic == BSWAP_64((uint64_t)UBERBLOCK_MAGIC))
	34	byteswap_uint64_array(ub, sizeof (uberblock_t));
	35
	36	if (ub->ub_magic != UBERBLOCK_MAGIC)
	37	return (SET_ERROR(EINVAL));
	38
	39	return (0);
	40	}
	41
	42	/*
	43	* Update the uberblock and return TRUE if anything changed in this
	44	* transaction group.
	45	*/
	46	boolean_t
86e3c28a	47	uberblock_update(uberblock_t ub, vdev_t rvd, uint64_t txg, uint64_t mmp_delay)
70e083d2 TG	48	{
	49	ASSERT(ub->ub_txg < txg);
	50
	51	/*
	52	* We explicitly do not set ub_version here, so that older versions
	53	* continue to be written with the previous uberblock version.
	54	*/
	55	ub->ub_magic = UBERBLOCK_MAGIC;
	56	ub->ub_txg = txg;
	57	ub->ub_guid_sum = rvd->vdev_guid_sum;
	58	ub->ub_timestamp = gethrestime_sec();
	59	ub->ub_software_version = SPA_VERSION;
86e3c28a CIK	60	ub->ub_mmp_magic = MMP_MAGIC;
	61	ub->ub_mmp_delay = spa_multihost(rvd->vdev_spa) ? mmp_delay : 0;
	62	ub->ub_mmp_seq = 0;
70e083d2 TG	63
	64	return (ub->ub_rootbp.blk_birth == txg);
	65	}