LXR linux/fs/freevxfs/vxfs

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (c) 2000-2001 Christoph Hellwig.
   4 */
   5#ifndef _VXFS_OLT_H_
   6#define _VXFS_OLT_H_
   7
   8/*
   9 * Veritas filesystem driver - Object Location Table data structures.
  10 *
  11 * This file contains definitions for the Object Location Table used
  12 * by the Veritas Filesystem version 2 and newer.
  13 */
  14
  15
  16/*
  17 * OLT magic number (vxfs_olt->olt_magic).
  18 */
  19#define VXFS_OLT_MAGIC          0xa504FCF5
  20
  21/*
  22 * VxFS OLT entry types.
  23 */
  24enum {
  25        VXFS_OLT_FREE   = 1,
  26        VXFS_OLT_FSHEAD = 2,
  27        VXFS_OLT_CUT    = 3,
  28        VXFS_OLT_ILIST  = 4,
  29        VXFS_OLT_DEV    = 5,
  30        VXFS_OLT_SB     = 6
  31};
  32
  33/*
  34 * VxFS OLT header.
  35 *
  36 * The Object Location Table header is placed at the beginning of each
  37 * OLT extent.  It is used to fing certain filesystem-wide metadata, e.g.
  38 * the initial inode list, the fileset header or the device configuration.
  39 */
  40struct vxfs_olt {
  41        __fs32          olt_magic;      /* magic number                 */
  42        __fs32          olt_size;       /* size of this entry           */
  43        __fs32          olt_checksum;   /* checksum of extent           */
  44        __u32           __unused1;      /* ???                          */
  45        __fs32          olt_mtime;      /* time of last mod. (sec)      */
  46        __fs32          olt_mutime;     /* time of last mod. (usec)     */
  47        __fs32          olt_totfree;    /* free space in OLT extent     */
  48        __fs32          olt_extents[2]; /* addr of this extent, replica */
  49        __fs32          olt_esize;      /* size of this extent          */
  50        __fs32          olt_next[2];    /* addr of next extent, replica */
  51        __fs32          olt_nsize;      /* size of next extent          */
  52        __u32           __unused2;      /* align to 8 byte boundary     */
  53};
  54
  55/*
  56 * VxFS common OLT entry (on disk).
  57 */
  58struct vxfs_oltcommon {
  59        __fs32          olt_type;       /* type of this record          */
  60        __fs32          olt_size;       /* size of this record          */
  61};
  62
  63/*
  64 * VxFS free OLT entry (on disk).
  65 */
  66struct vxfs_oltfree {
  67        __fs32          olt_type;       /* type of this record          */
  68        __fs32          olt_fsize;      /* size of this free record     */
  69};
  70
  71/*
  72 * VxFS initial-inode list (on disk).
  73 */
  74struct vxfs_oltilist {
  75        __fs32  olt_type;       /* type of this record          */
  76        __fs32  olt_size;       /* size of this record          */
  77        __fs32          olt_iext[2];    /* initial inode list, replica  */
  78};
  79
  80/*
  81 * Current Usage Table 
  82 */
  83struct vxfs_oltcut {
  84        __fs32          olt_type;       /* type of this record          */
  85        __fs32          olt_size;       /* size of this record          */
  86        __fs32          olt_cutino;     /* inode of current usage table */
  87        __u8            __pad;          /* unused, 8 byte align         */
  88};
  89
  90/*
  91 * Inodes containing Superblock, Intent log and OLTs 
  92 */
  93struct vxfs_oltsb {
  94        __fs32          olt_type;       /* type of this record          */
  95        __fs32          olt_size;       /* size of this record          */
  96        __fs32          olt_sbino;      /* inode of superblock file     */
  97        __u32           __unused1;      /* ???                          */
  98        __fs32          olt_logino[2];  /* inode of log file,replica    */
  99        __fs32          olt_oltino[2];  /* inode of OLT, replica        */
 100};
 101
 102/*
 103 * Inode containing device configuration + it's replica 
 104 */
 105struct vxfs_oltdev {
 106        __fs32          olt_type;       /* type of this record          */
 107        __fs32          olt_size;       /* size of this record          */
 108        __fs32          olt_devino[2];  /* inode of device config files */
 109};
 110
 111/*
 112 * Fileset header 
 113 */
 114struct vxfs_oltfshead {
 115        __fs32          olt_type;       /* type number                  */
 116        __fs32          olt_size;       /* size of this record          */
 117        __fs32          olt_fsino[2];   /* inodes of fileset header     */
 118};
 119
 120#endif /* _VXFS_OLT_H_ */
 121