uberblock.c

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    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 https://opensource.org/licenses/CDDL-1.0.
   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, 2017 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 #include <sys/mmp.h>
   30 
   31 int
   32 uberblock_verify(uberblock_t *ub)
   33 {
   34         if (ub->ub_magic == BSWAP_64((uint64_t)UBERBLOCK_MAGIC))
   35                 byteswap_uint64_array(ub, sizeof (uberblock_t));
   36 
   37         if (ub->ub_magic != UBERBLOCK_MAGIC)
   38                 return (SET_ERROR(EINVAL));
   39 
   40         return (0);
   41 }
   42 
   43 /*
   44  * Update the uberblock and return TRUE if anything changed in this
   45  * transaction group.
   46  */
   47 boolean_t
   48 uberblock_update(uberblock_t *ub, vdev_t *rvd, uint64_t txg, uint64_t mmp_delay)
   49 {
   50         ASSERT(ub->ub_txg < txg);
   51 
   52         /*
   53          * We explicitly do not set ub_version here, so that older versions
   54          * continue to be written with the previous uberblock version.
   55          */
   56         ub->ub_magic = UBERBLOCK_MAGIC;
   57         ub->ub_txg = txg;
   58         ub->ub_guid_sum = rvd->vdev_guid_sum;
   59         ub->ub_timestamp = gethrestime_sec();
   60         ub->ub_software_version = SPA_VERSION;
   61         ub->ub_mmp_magic = MMP_MAGIC;
   62         if (spa_multihost(rvd->vdev_spa)) {
   63                 ub->ub_mmp_delay = mmp_delay;
   64                 ub->ub_mmp_config = MMP_SEQ_SET(0) |
   65                     MMP_INTERVAL_SET(zfs_multihost_interval) |
   66                     MMP_FAIL_INT_SET(zfs_multihost_fail_intervals);
   67         } else {
   68                 ub->ub_mmp_delay = 0;
   69                 ub->ub_mmp_config = 0;
   70         }
   71         ub->ub_checkpoint_txg = 0;
   72 
   73         return (ub->ub_rootbp.blk_birth == txg);
   74 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/zfs/uberblock.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/zfs/uberblock.c