fs/freevxfs/vxfs_olt.h

   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  */
  24 enum {
  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  */
  40 struct 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  */
  58 struct 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  */
  66 struct 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  */
  74 struct 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  */
  83 struct 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  */
  93 struct 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  */
 105 struct 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  */
 114 struct 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_ */