fs/freevxfs/vxfs_olt.h

   1 /*
   2  * Copyright (c) 2000-2001 Christoph Hellwig.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions, and the following disclaimer,
  10  *    without modification.
  11  * 2. The name of the author may not be used to endorse or promote products
  12  *    derived from this software without specific prior written permission.
  13  *
  14  * Alternatively, this software may be distributed under the terms of the
  15  * GNU General Public License ("GPL").
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  */
  30 #ifndef _VXFS_OLT_H_
  31 #define _VXFS_OLT_H_
  32
  33 /*
  34  * Veritas filesystem driver - Object Location Table data structures.
  35  *
  36  * This file contains definitions for the Object Location Table used
  37  * by the Veritas Filesystem version 2 and newer.
  38  */
  39
  40
  41 /*
  42  * OLT magic number (vxfs_olt->olt_magic).
  43  */
  44 #define VXFS_OLT_MAGIC          0xa504FCF5
  45
  46 /*
  47  * VxFS OLT entry types.
  48  */
  49 enum {
  50         VXFS_OLT_FREE   = 1,
  51         VXFS_OLT_FSHEAD = 2,
  52         VXFS_OLT_CUT    = 3,
  53         VXFS_OLT_ILIST  = 4,
  54         VXFS_OLT_DEV    = 5,
  55         VXFS_OLT_SB     = 6
  56 };
  57
  58 /*
  59  * VxFS OLT header.
  60  *
  61  * The Object Location Table header is placed at the beginning of each
  62  * OLT extent.  It is used to fing certain filesystem-wide metadata, e.g.
  63  * the initial inode list, the fileset header or the device configuration.
  64  */
  65 struct vxfs_olt {
  66         __fs32          olt_magic;      /* magic number                 */
  67         __fs32          olt_size;       /* size of this entry           */
  68         __fs32          olt_checksum;   /* checksum of extent           */
  69         __u32           __unused1;      /* ???                          */
  70         __fs32          olt_mtime;      /* time of last mod. (sec)      */
  71         __fs32          olt_mutime;     /* time of last mod. (usec)     */
  72         __fs32          olt_totfree;    /* free space in OLT extent     */
  73         __fs32          olt_extents[2]; /* addr of this extent, replica */
  74         __fs32          olt_esize;      /* size of this extent          */
  75         __fs32          olt_next[2];    /* addr of next extent, replica */
  76         __fs32          olt_nsize;      /* size of next extent          */
  77         __u32           __unused2;      /* align to 8 byte boundary     */
  78 };
  79
  80 /*
  81  * VxFS common OLT entry (on disk).
  82  */
  83 struct vxfs_oltcommon {
  84         __fs32          olt_type;       /* type of this record          */
  85         __fs32          olt_size;       /* size of this record          */
  86 };
  87
  88 /*
  89  * VxFS free OLT entry (on disk).
  90  */
  91 struct vxfs_oltfree {
  92         __fs32          olt_type;       /* type of this record          */
  93         __fs32          olt_fsize;      /* size of this free record     */
  94 };
  95
  96 /*
  97  * VxFS initial-inode list (on disk).
  98  */
  99 struct vxfs_oltilist {
 100         __fs32  olt_type;       /* type of this record          */
 101         __fs32  olt_size;       /* size of this record          */
 102         __fs32          olt_iext[2];    /* initial inode list, replica  */
 103 };
 104
 105 /*
 106  * Current Usage Table
 107  */
 108 struct vxfs_oltcut {
 109         __fs32          olt_type;       /* type of this record          */
 110         __fs32          olt_size;       /* size of this record          */
 111         __fs32          olt_cutino;     /* inode of current usage table */
 112         __u8            __pad;          /* unused, 8 byte align         */
 113 };
 114
 115 /*
 116  * Inodes containing Superblock, Intent log and OLTs
 117  */
 118 struct vxfs_oltsb {
 119         __fs32          olt_type;       /* type of this record          */
 120         __fs32          olt_size;       /* size of this record          */
 121         __fs32          olt_sbino;      /* inode of superblock file     */
 122         __u32           __unused1;      /* ???                          */
 123         __fs32          olt_logino[2];  /* inode of log file,replica    */
 124         __fs32          olt_oltino[2];  /* inode of OLT, replica        */
 125 };
 126
 127 /*
 128  * Inode containing device configuration + it's replica
 129  */
 130 struct vxfs_oltdev {
 131         __fs32          olt_type;       /* type of this record          */
 132         __fs32          olt_size;       /* size of this record          */
 133         __fs32          olt_devino[2];  /* inode of device config files */
 134 };
 135
 136 /*
 137  * Fileset header
 138  */
 139 struct vxfs_oltfshead {
 140         __fs32          olt_type;       /* type number                  */
 141         __fs32          olt_size;       /* size of this record          */
 142         __fs32          olt_fsino[2];   /* inodes of fileset header     */
 143 };
 144
 145 #endif /* _VXFS_OLT_H_ */