1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ecc2d604Sbonwick * Common Development and Distribution License (the "License"). 6ecc2d604Sbonwick * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22*3f9d6ad7SLin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23fa9e4066Sahrens */ 24fa9e4066Sahrens 25fa9e4066Sahrens #ifndef _SYS_UBERBLOCK_IMPL_H 26fa9e4066Sahrens #define _SYS_UBERBLOCK_IMPL_H 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/uberblock.h> 29fa9e4066Sahrens 30fa9e4066Sahrens #ifdef __cplusplus 31fa9e4066Sahrens extern "C" { 32fa9e4066Sahrens #endif 33fa9e4066Sahrens 34fa9e4066Sahrens /* 35fa9e4066Sahrens * The uberblock version is incremented whenever an incompatible on-disk 36fa9e4066Sahrens * format change is made to the SPA, DMU, or ZAP. 37fa9e4066Sahrens * 38fa9e4066Sahrens * Note: the first two fields should never be moved. When a storage pool 39fa9e4066Sahrens * is opened, the uberblock must be read off the disk before the version 40fa9e4066Sahrens * can be checked. If the ub_version field is moved, we may not detect 41fa9e4066Sahrens * version mismatch. If the ub_magic field is moved, applications that 42fa9e4066Sahrens * expect the magic number in the first word won't work. 43fa9e4066Sahrens */ 44fa9e4066Sahrens #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ 45ecc2d604Sbonwick #define UBERBLOCK_SHIFT 10 /* up to 1K */ 46fa9e4066Sahrens 47fa9e4066Sahrens struct uberblock { 48fa9e4066Sahrens uint64_t ub_magic; /* UBERBLOCK_MAGIC */ 49e7437265Sahrens uint64_t ub_version; /* SPA_VERSION */ 50fa9e4066Sahrens uint64_t ub_txg; /* txg of last sync */ 51fa9e4066Sahrens uint64_t ub_guid_sum; /* sum of all vdev guids */ 52fa9e4066Sahrens uint64_t ub_timestamp; /* UTC time of last sync */ 53fa9e4066Sahrens blkptr_t ub_rootbp; /* MOS objset_phys_t */ 54*3f9d6ad7SLin Ling 55*3f9d6ad7SLin Ling /* highest SPA_VERSION supported by software that wrote this txg */ 56*3f9d6ad7SLin Ling uint64_t ub_software_version; 57fa9e4066Sahrens }; 58fa9e4066Sahrens 59fa9e4066Sahrens #ifdef __cplusplus 60fa9e4066Sahrens } 61fa9e4066Sahrens #endif 62fa9e4066Sahrens 63fa9e4066Sahrens #endif /* _SYS_UBERBLOCK_IMPL_H */ 64