LXR linux/fs/freevxfs/vxfs

   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 */
  49enum {
  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 */
  65struct 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 */
  83struct 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 */
  91struct 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 */
  99struct 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 */
 108struct 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 */
 118struct 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 */
 130struct 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 */
 139struct 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_ */
 146