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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_UBERBLOCK_IMPL_H 27 #define _SYS_UBERBLOCK_IMPL_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/uberblock.h> 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 /* 38 * The uberblock version is incremented whenever an incompatible on-disk 39 * format change is made to the SPA, DMU, or ZAP. 40 * 41 * Note: the first two fields should never be moved. When a storage pool 42 * is opened, the uberblock must be read off the disk before the version 43 * can be checked. If the ub_version field is moved, we may not detect 44 * version mismatch. If the ub_magic field is moved, applications that 45 * expect the magic number in the first word won't work. 46 */ 47 #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ 48 #define UBERBLOCK_SHIFT 10 /* up to 1K */ 49 50 struct uberblock { 51 uint64_t ub_magic; /* UBERBLOCK_MAGIC */ 52 uint64_t ub_version; /* SPA_VERSION */ 53 uint64_t ub_txg; /* txg of last sync */ 54 uint64_t ub_guid_sum; /* sum of all vdev guids */ 55 uint64_t ub_timestamp; /* UTC time of last sync */ 56 blkptr_t ub_rootbp; /* MOS objset_phys_t */ 57 }; 58 59 #ifdef __cplusplus 60 } 61 #endif 62 63 #endif /* _SYS_UBERBLOCK_IMPL_H */ 64