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 #ifndef _SYS_UBERBLOCK_IMPL_H 28 #define _SYS_UBERBLOCK_IMPL_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/uberblock.h> 33 34 #ifdef __cplusplus 35 extern "C" { 36 #endif 37 38 /* 39 * The uberblock version is incremented whenever an incompatible on-disk 40 * format change is made to the SPA, DMU, or ZAP. 41 * 42 * Note: the first two fields should never be moved. When a storage pool 43 * is opened, the uberblock must be read off the disk before the version 44 * can be checked. If the ub_version field is moved, we may not detect 45 * version mismatch. If the ub_magic field is moved, applications that 46 * expect the magic number in the first word won't work. 47 */ 48 49 #define UBERBLOCK_SHIFT (10) 50 #define UBERBLOCK_SIZE (1ULL << UBERBLOCK_SHIFT) 51 52 #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ 53 54 #define UBERBLOCK_VERSION 1ULL 55 56 struct uberblock { 57 uint64_t ub_magic; /* UBERBLOCK_MAGIC */ 58 uint64_t ub_version; /* UBERBLOCK_VERSION */ 59 uint64_t ub_txg; /* txg of last sync */ 60 uint64_t ub_guid_sum; /* sum of all vdev guids */ 61 uint64_t ub_timestamp; /* UTC time of last sync */ 62 blkptr_t ub_rootbp; /* MOS objset_phys_t */ 63 }; 64 65 typedef struct uberblock_phys { 66 uberblock_t ubp_uberblock; 67 char ubp_pad[UBERBLOCK_SIZE - sizeof (uberblock_t) - 68 sizeof (zio_block_tail_t)]; 69 zio_block_tail_t ubp_zbt; 70 } uberblock_phys_t; 71 72 #ifdef __cplusplus 73 } 74 #endif 75 76 #endif /* _SYS_UBERBLOCK_IMPL_H */ 77