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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/zfs_context.h> 30 #include <sys/uberblock_impl.h> 31 #include <sys/vdev_impl.h> 32 33 /* Keep the uberblock version in a varialbe so we can get at it with mdb */ 34 static uint64_t uberblock_version = UBERBLOCK_VERSION; 35 36 int 37 uberblock_verify(uberblock_t *ub) 38 { 39 if (ub->ub_magic == BSWAP_64((uint64_t)UBERBLOCK_MAGIC)) 40 byteswap_uint64_array(ub, sizeof (uberblock_t)); 41 42 if (ub->ub_magic != UBERBLOCK_MAGIC) 43 return (EINVAL); 44 45 if (ub->ub_version != UBERBLOCK_VERSION) 46 return (ENOTSUP); 47 48 return (0); 49 } 50 51 /* 52 * Update the uberblock and return a boolean value indicating whether 53 * anything changed in this transaction group. 54 */ 55 int 56 uberblock_update(uberblock_t *ub, vdev_t *rvd, uint64_t txg) 57 { 58 ASSERT(ub->ub_txg < txg); 59 60 ub->ub_magic = UBERBLOCK_MAGIC; 61 ub->ub_version = UBERBLOCK_VERSION; 62 ub->ub_txg = txg; 63 ub->ub_guid_sum = rvd->vdev_guid_sum; 64 ub->ub_timestamp = gethrestime_sec(); 65 66 return (ub->ub_rootbp.blk_birth == txg); 67 } 68