1789Sahrens /* 2789Sahrens * CDDL HEADER START 3789Sahrens * 4789Sahrens * The contents of this file are subject to the terms of the 51732Sbonwick * Common Development and Distribution License (the "License"). 61732Sbonwick * You may not use this file except in compliance with the License. 7789Sahrens * 8789Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9789Sahrens * or http://www.opensolaris.org/os/licensing. 10789Sahrens * See the License for the specific language governing permissions 11789Sahrens * and limitations under the License. 12789Sahrens * 13789Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14789Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15789Sahrens * If applicable, add the following below this CDDL HEADER, with the 16789Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17789Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18789Sahrens * 19789Sahrens * CDDL HEADER END 20789Sahrens */ 21789Sahrens /* 22*12296SLin.Ling@Sun.COM * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23789Sahrens */ 24789Sahrens 25789Sahrens #ifndef _SYS_UBERBLOCK_IMPL_H 26789Sahrens #define _SYS_UBERBLOCK_IMPL_H 27789Sahrens 28789Sahrens #include <sys/uberblock.h> 29789Sahrens 30789Sahrens #ifdef __cplusplus 31789Sahrens extern "C" { 32789Sahrens #endif 33789Sahrens 34789Sahrens /* 35789Sahrens * The uberblock version is incremented whenever an incompatible on-disk 36789Sahrens * format change is made to the SPA, DMU, or ZAP. 37789Sahrens * 38789Sahrens * Note: the first two fields should never be moved. When a storage pool 39789Sahrens * is opened, the uberblock must be read off the disk before the version 40789Sahrens * can be checked. If the ub_version field is moved, we may not detect 41789Sahrens * version mismatch. If the ub_magic field is moved, applications that 42789Sahrens * expect the magic number in the first word won't work. 43789Sahrens */ 44789Sahrens #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ 451732Sbonwick #define UBERBLOCK_SHIFT 10 /* up to 1K */ 46789Sahrens 47789Sahrens struct uberblock { 48789Sahrens uint64_t ub_magic; /* UBERBLOCK_MAGIC */ 494577Sahrens uint64_t ub_version; /* SPA_VERSION */ 50789Sahrens uint64_t ub_txg; /* txg of last sync */ 51789Sahrens uint64_t ub_guid_sum; /* sum of all vdev guids */ 52789Sahrens uint64_t ub_timestamp; /* UTC time of last sync */ 53789Sahrens blkptr_t ub_rootbp; /* MOS objset_phys_t */ 54*12296SLin.Ling@Sun.COM 55*12296SLin.Ling@Sun.COM /* highest SPA_VERSION supported by software that wrote this txg */ 56*12296SLin.Ling@Sun.COM uint64_t ub_software_version; 57789Sahrens }; 58789Sahrens 59789Sahrens #ifdef __cplusplus 60789Sahrens } 61789Sahrens #endif 62789Sahrens 63789Sahrens #endif /* _SYS_UBERBLOCK_IMPL_H */ 64