arch/all-pc/boot/grub2-aros/include/grub/zfs/uberblock_impl.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /*
  19  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  20  * Use is subject to license terms.
  21  */
  22
  23 #ifndef _SYS_UBERBLOCK_IMPL_H
  24 #define _SYS_UBERBLOCK_IMPL_H
  25
  26 /*
  27  * The uberblock version is incremented whenever an incompatible on-disk
  28  * format change is made to the SPA, DMU, or ZAP.
  29  *
  30  * Note: the first two fields should never be moved.  When a storage pool
  31  * is opened, the uberblock must be read off the disk before the version
  32  * can be checked.  If the ub_version field is moved, we may not detect
  33  * version mismatch.  If the ub_magic field is moved, applications that
  34  * expect the magic number in the first word won't work.
  35  */
  36 #define UBERBLOCK_MAGIC         0x00bab10c              /* oo-ba-bloc!  */
  37 #define UBERBLOCK_SHIFT         10                      /* up to 1K     */
  38
  39 typedef struct uberblock {
  40         grub_uint64_t   ub_magic;       /* UBERBLOCK_MAGIC              */
  41         grub_uint64_t   ub_version;     /* ZFS_VERSION                  */
  42         grub_uint64_t   ub_txg;         /* txg of last sync             */
  43         grub_uint64_t   ub_guid_sum;    /* sum of all vdev guids        */
  44         grub_uint64_t   ub_timestamp;   /* UTC time of last sync        */
  45         blkptr_t        ub_rootbp;      /* MOS objset_phys_t            */
  46 } uberblock_t;
  47
  48 #define UBERBLOCK_SIZE          (1ULL << UBERBLOCK_SHIFT)
  49 #define VDEV_UBERBLOCK_SHIFT    UBERBLOCK_SHIFT
  50
  51 /* XXX Uberblock_phys_t is no longer in the kernel zfs */
  52 typedef struct uberblock_phys {
  53         uberblock_t     ubp_uberblock;
  54         char            ubp_pad[UBERBLOCK_SIZE - sizeof (uberblock_t) -
  55                                 sizeof (zio_eck_t)];
  56         zio_eck_t       ubp_zec;
  57 } uberblock_phys_t;
  58
  59
  60 #endif  /* _SYS_UBERBLOCK_IMPL_H */