| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| /* |
| * Copyright 2007 Sun Microsystems, Inc. All rights reserved. |
| * Use is subject to license terms. |
| */ |
| |
| #ifndef _SYS_UBERBLOCK_IMPL_H |
| #define _SYS_UBERBLOCK_IMPL_H |
| |
| //#pragma ident "%Z%%M% %I% %E% SMI" |
| |
| /* |
| * The uberblock version is incremented whenever an incompatible on-disk |
| * format change is made to the SPA, DMU, or ZAP. |
| * |
| * Note: the first two fields should never be moved. When a storage pool |
| * is opened, the uberblock must be read off the disk before the version |
| * can be checked. If the ub_version field is moved, we may not detect |
| * version mismatch. If the ub_magic field is moved, applications that |
| * expect the magic number in the first word won't work. |
| */ |
| #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ |
| #define UBERBLOCK_SHIFT 10 /* up to 1K */ |
| |
| struct uberblock { |
| uint64_t ub_magic; /* UBERBLOCK_MAGIC */ |
| uint64_t ub_version; /* ZFS_VERSION */ |
| uint64_t ub_txg; /* txg of last sync */ |
| uint64_t ub_guid_sum; /* sum of all vdev guids */ |
| uint64_t ub_timestamp; /* UTC time of last sync */ |
| blkptr_t ub_rootbp; /* MOS objset_phys_t */ |
| }; |
| |
| #endif /* _SYS_UBERBLOCK_IMPL_H */ |