1b1b8ab34Slling /* 2b1b8ab34Slling * GRUB -- GRand Unified Bootloader 3b1b8ab34Slling * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4b1b8ab34Slling * 5b1b8ab34Slling * This program is free software; you can redistribute it and/or modify 6b1b8ab34Slling * it under the terms of the GNU General Public License as published by 7b1b8ab34Slling * the Free Software Foundation; either version 2 of the License, or 8b1b8ab34Slling * (at your option) any later version. 9b1b8ab34Slling * 10b1b8ab34Slling * This program is distributed in the hope that it will be useful, 11b1b8ab34Slling * but WITHOUT ANY WARRANTY; without even the implied warranty of 12b1b8ab34Slling * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13b1b8ab34Slling * GNU General Public License for more details. 14b1b8ab34Slling * 15b1b8ab34Slling * You should have received a copy of the GNU General Public License 16b1b8ab34Slling * along with this program; if not, write to the Free Software 17b1b8ab34Slling * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18b1b8ab34Slling */ 19b1b8ab34Slling /* 20b1b8ab34Slling * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 21b1b8ab34Slling * Use is subject to license terms. 22b1b8ab34Slling */ 23b1b8ab34Slling 24b1b8ab34Slling #ifndef _SYS_UBERBLOCK_IMPL_H 25b1b8ab34Slling #define _SYS_UBERBLOCK_IMPL_H 26b1b8ab34Slling 27b1b8ab34Slling /* 28b1b8ab34Slling * The uberblock version is incremented whenever an incompatible on-disk 29b1b8ab34Slling * format change is made to the SPA, DMU, or ZAP. 30b1b8ab34Slling * 31b1b8ab34Slling * Note: the first two fields should never be moved. When a storage pool 32b1b8ab34Slling * is opened, the uberblock must be read off the disk before the version 33b1b8ab34Slling * can be checked. If the ub_version field is moved, we may not detect 34b1b8ab34Slling * version mismatch. If the ub_magic field is moved, applications that 35b1b8ab34Slling * expect the magic number in the first word won't work. 36b1b8ab34Slling */ 37b1b8ab34Slling #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ 38b1b8ab34Slling #define UBERBLOCK_SHIFT 10 /* up to 1K */ 39b1b8ab34Slling 40b1b8ab34Slling struct uberblock { 41b1b8ab34Slling uint64_t ub_magic; /* UBERBLOCK_MAGIC */ 42b1b8ab34Slling uint64_t ub_version; /* ZFS_VERSION */ 43b1b8ab34Slling uint64_t ub_txg; /* txg of last sync */ 44b1b8ab34Slling uint64_t ub_guid_sum; /* sum of all vdev guids */ 45b1b8ab34Slling uint64_t ub_timestamp; /* UTC time of last sync */ 46b1b8ab34Slling blkptr_t ub_rootbp; /* MOS objset_phys_t */ 47b1b8ab34Slling }; 48b1b8ab34Slling 49b1b8ab34Slling #endif /* _SYS_UBERBLOCK_IMPL_H */ 50