1*fa9e4066Sahrens /* 2*fa9e4066Sahrens * CDDL HEADER START 3*fa9e4066Sahrens * 4*fa9e4066Sahrens * The contents of this file are subject to the terms of the 5*fa9e4066Sahrens * Common Development and Distribution License, Version 1.0 only 6*fa9e4066Sahrens * (the "License"). You may not use this file except in compliance 7*fa9e4066Sahrens * with the License. 8*fa9e4066Sahrens * 9*fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 11*fa9e4066Sahrens * See the License for the specific language governing permissions 12*fa9e4066Sahrens * and limitations under the License. 13*fa9e4066Sahrens * 14*fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 15*fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 17*fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 18*fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 19*fa9e4066Sahrens * 20*fa9e4066Sahrens * CDDL HEADER END 21*fa9e4066Sahrens */ 22*fa9e4066Sahrens /* 23*fa9e4066Sahrens * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*fa9e4066Sahrens * Use is subject to license terms. 25*fa9e4066Sahrens */ 26*fa9e4066Sahrens 27*fa9e4066Sahrens #ifndef _SYS_UBERBLOCK_IMPL_H 28*fa9e4066Sahrens #define _SYS_UBERBLOCK_IMPL_H 29*fa9e4066Sahrens 30*fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 31*fa9e4066Sahrens 32*fa9e4066Sahrens #include <sys/uberblock.h> 33*fa9e4066Sahrens 34*fa9e4066Sahrens #ifdef __cplusplus 35*fa9e4066Sahrens extern "C" { 36*fa9e4066Sahrens #endif 37*fa9e4066Sahrens 38*fa9e4066Sahrens /* 39*fa9e4066Sahrens * The uberblock version is incremented whenever an incompatible on-disk 40*fa9e4066Sahrens * format change is made to the SPA, DMU, or ZAP. 41*fa9e4066Sahrens * 42*fa9e4066Sahrens * Note: the first two fields should never be moved. When a storage pool 43*fa9e4066Sahrens * is opened, the uberblock must be read off the disk before the version 44*fa9e4066Sahrens * can be checked. If the ub_version field is moved, we may not detect 45*fa9e4066Sahrens * version mismatch. If the ub_magic field is moved, applications that 46*fa9e4066Sahrens * expect the magic number in the first word won't work. 47*fa9e4066Sahrens */ 48*fa9e4066Sahrens 49*fa9e4066Sahrens #define UBERBLOCK_SHIFT (10) 50*fa9e4066Sahrens #define UBERBLOCK_SIZE (1ULL << UBERBLOCK_SHIFT) 51*fa9e4066Sahrens 52*fa9e4066Sahrens #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ 53*fa9e4066Sahrens 54*fa9e4066Sahrens #define UBERBLOCK_VERSION 1ULL 55*fa9e4066Sahrens 56*fa9e4066Sahrens struct uberblock { 57*fa9e4066Sahrens uint64_t ub_magic; /* UBERBLOCK_MAGIC */ 58*fa9e4066Sahrens uint64_t ub_version; /* UBERBLOCK_VERSION */ 59*fa9e4066Sahrens uint64_t ub_txg; /* txg of last sync */ 60*fa9e4066Sahrens uint64_t ub_guid_sum; /* sum of all vdev guids */ 61*fa9e4066Sahrens uint64_t ub_timestamp; /* UTC time of last sync */ 62*fa9e4066Sahrens blkptr_t ub_rootbp; /* MOS objset_phys_t */ 63*fa9e4066Sahrens }; 64*fa9e4066Sahrens 65*fa9e4066Sahrens typedef struct uberblock_phys { 66*fa9e4066Sahrens uberblock_t ubp_uberblock; 67*fa9e4066Sahrens char ubp_pad[UBERBLOCK_SIZE - sizeof (uberblock_t) - 68*fa9e4066Sahrens sizeof (zio_block_tail_t)]; 69*fa9e4066Sahrens zio_block_tail_t ubp_zbt; 70*fa9e4066Sahrens } uberblock_phys_t; 71*fa9e4066Sahrens 72*fa9e4066Sahrens #ifdef __cplusplus 73*fa9e4066Sahrens } 74*fa9e4066Sahrens #endif 75*fa9e4066Sahrens 76*fa9e4066Sahrens #endif /* _SYS_UBERBLOCK_IMPL_H */ 77