/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 */
#ifndef _VXFS_OLT_H_
#define _VXFS_OLT_H_

/*
 * Veritas filesystem driver - Object Location Table data structures.
 *
 * This file contains definitions for the Object Location Table used
 * by the Veritas Filesystem version 2 and newer.
 */


/*
 * OLT magic number (vxfs_olt->olt_magic).
 */
#define VXFS_OLT_MAGIC          0xa504FCF5

/*
 * VxFS OLT entry types.
 */
enum {
        VXFS_OLT_FREE   = 1,
        VXFS_OLT_FSHEAD = 2,
        VXFS_OLT_CUT    = 3,
        VXFS_OLT_ILIST  = 4,
        VXFS_OLT_DEV    = 5,
        VXFS_OLT_SB     = 6
};

/*
 * VxFS OLT header.
 *
 * The Object Location Table header is placed at the beginning of each
 * OLT extent.  It is used to fing certain filesystem-wide metadata, e.g.
 * the initial inode list, the fileset header or the device configuration.
 */
struct vxfs_olt {
        __fs32          olt_magic;      /* magic number                 */
        __fs32          olt_size;       /* size of this entry           */
        __fs32          olt_checksum;   /* checksum of extent           */
        __u32           __unused1;      /* ???                          */
        __fs32          olt_mtime;      /* time of last mod. (sec)      */
        __fs32          olt_mutime;     /* time of last mod. (usec)     */
        __fs32          olt_totfree;    /* free space in OLT extent     */
        __fs32          olt_extents[2]; /* addr of this extent, replica */
        __fs32          olt_esize;      /* size of this extent          */
        __fs32          olt_next[2];    /* addr of next extent, replica */
        __fs32          olt_nsize;      /* size of next extent          */
        __u32           __unused2;      /* align to 8 byte boundary     */
};

/*
 * VxFS common OLT entry (on disk).
 */
struct vxfs_oltcommon {
        __fs32          olt_type;       /* type of this record          */
        __fs32          olt_size;       /* size of this record          */
};

/*
 * VxFS free OLT entry (on disk).
 */
struct vxfs_oltfree {
        __fs32          olt_type;       /* type of this record          */
        __fs32          olt_fsize;      /* size of this free record     */
};

/*
 * VxFS initial-inode list (on disk).
 */
struct vxfs_oltilist {
        __fs32  olt_type;       /* type of this record          */
        __fs32  olt_size;       /* size of this record          */
        __fs32          olt_iext[2];    /* initial inode list, replica  */
};

/*
 * Current Usage Table 
 */
struct vxfs_oltcut {
        __fs32          olt_type;       /* type of this record          */
        __fs32          olt_size;       /* size of this record          */
        __fs32          olt_cutino;     /* inode of current usage table */
        __u8            __pad;          /* unused, 8 byte align         */
};

/*
 * Inodes containing Superblock, Intent log and OLTs 
 */
struct vxfs_oltsb {
        __fs32          olt_type;       /* type of this record          */
        __fs32          olt_size;       /* size of this record          */
        __fs32          olt_sbino;      /* inode of superblock file     */
        __u32           __unused1;      /* ???                          */
        __fs32          olt_logino[2];  /* inode of log file,replica    */
        __fs32          olt_oltino[2];  /* inode of OLT, replica        */
};

/*
 * Inode containing device configuration + it's replica 
 */
struct vxfs_oltdev {
        __fs32          olt_type;       /* type of this record          */
        __fs32          olt_size;       /* size of this record          */
        __fs32          olt_devino[2];  /* inode of device config files */
};

/*
 * Fileset header 
 */
struct vxfs_oltfshead {
        __fs32          olt_type;       /* type number                  */
        __fs32          olt_size;       /* size of this record          */
        __fs32          olt_fsino[2];   /* inodes of fileset header     */
};

#endif /* _VXFS_OLT_H_ */