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 */ 24 25 #include <sys/zfs_context.h> 26 #include <sys/uberblock_impl.h> 27 #include <sys/vdev_impl.h> 28 29 int 30 uberblock_verify(uberblock_t *ub) 31 { 32 if (ub->ub_magic == BSWAP_64((uint64_t)UBERBLOCK_MAGIC)) 33 byteswap_uint64_array(ub, sizeof (uberblock_t)); 34 35 if (ub->ub_magic != UBERBLOCK_MAGIC) 36 return (EINVAL); 37 38 return (0); 39 } 40 41 /* 42 * Update the uberblock and return a boolean value indicating whether 43 * anything changed in this transaction group. 44 */ 45 int 46 uberblock_update(uberblock_t *ub, vdev_t *rvd, uint64_t txg) 47 { 48 ASSERT(ub->ub_txg < txg); 49 50 /* 51 * We explicitly do not set ub_version here, so that older versions 52 * continue to be written with the previous uberblock version. 53 */ 54 ub->ub_magic = UBERBLOCK_MAGIC; 55 ub->ub_txg = txg; 56 ub->ub_guid_sum = rvd->vdev_guid_sum; 57 ub->ub_timestamp = gethrestime_sec(); 58 ub->ub_software_version = SPA_VERSION; 59 60 return (ub->ub_rootbp.blk_birth == txg); 61 } 62