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      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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
     23  */
     24 
     25 #ifndef _SYS_UBERBLOCK_IMPL_H
     26 #define	_SYS_UBERBLOCK_IMPL_H
     27 
     28 #include <sys/uberblock.h>
     29 
     30 #ifdef	__cplusplus
     31 extern "C" {
     32 #endif
     33 
     34 /*
     35  * The uberblock version is incremented whenever an incompatible on-disk
     36  * format change is made to the SPA, DMU, or ZAP.
     37  *
     38  * Note: the first two fields should never be moved.  When a storage pool
     39  * is opened, the uberblock must be read off the disk before the version
     40  * can be checked.  If the ub_version field is moved, we may not detect
     41  * version mismatch.  If the ub_magic field is moved, applications that
     42  * expect the magic number in the first word won't work.
     43  */
     44 #define	UBERBLOCK_MAGIC		0x00bab10c		/* oo-ba-bloc!	*/
     45 #define	UBERBLOCK_SHIFT		10			/* up to 1K	*/
     46 
     47 struct uberblock {
     48 	uint64_t	ub_magic;	/* UBERBLOCK_MAGIC		*/
     49 	uint64_t	ub_version;	/* SPA_VERSION			*/
     50 	uint64_t	ub_txg;		/* txg of last sync		*/
     51 	uint64_t	ub_guid_sum;	/* sum of all vdev guids	*/
     52 	uint64_t	ub_timestamp;	/* UTC time of last sync	*/
     53 	blkptr_t	ub_rootbp;	/* MOS objset_phys_t		*/
     54 
     55 	/* highest SPA_VERSION supported by software that wrote this txg */
     56 	uint64_t	ub_software_version;
     57 };
     58 
     59 #ifdef	__cplusplus
     60 }
     61 #endif
     62 
     63 #endif	/* _SYS_UBERBLOCK_IMPL_H */
     64