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/*
* 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 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_UBERBLOCK_IMPL_H
#define _SYS_UBERBLOCK_IMPL_H
/*
* 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 */
typedef struct uberblock {
grub_uint64_t ub_magic; /* UBERBLOCK_MAGIC */
grub_uint64_t ub_version; /* ZFS_VERSION */
grub_uint64_t ub_txg; /* txg of last sync */
grub_uint64_t ub_guid_sum; /* sum of all vdev guids */
grub_uint64_t ub_timestamp; /* UTC time of last sync */
blkptr_t ub_rootbp; /* MOS objset_phys_t */
} uberblock_t;
#define UBERBLOCK_SIZE (1ULL << UBERBLOCK_SHIFT)
#define VDEV_UBERBLOCK_SHIFT UBERBLOCK_SHIFT
/* XXX Uberblock_phys_t is no longer in the kernel zfs */
typedef struct uberblock_phys {
uberblock_t ubp_uberblock;
char ubp_pad[UBERBLOCK_SIZE - sizeof (uberblock_t) -
sizeof (zio_eck_t)];
zio_eck_t ubp_zec;
} uberblock_phys_t;
#endif /* _SYS_UBERBLOCK_IMPL_H */
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