vxfs_olt.h

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/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
#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 {
    u_int32_t   olt_magic;  /* magic number         */
    u_int32_t   olt_size;   /* size of this entry       */
    u_int32_t   olt_checksum;   /* checksum of extent       */
    u_int32_t   __unused1;  /* ???              */
    u_int32_t   olt_mtime;  /* time of last mod. (sec)  */
    u_int32_t   olt_mutime; /* time of last mod. (usec) */
    u_int32_t   olt_totfree;    /* free space in OLT extent */
    vx_daddr_t  olt_extents[2]; /* addr of this extent, replica */
    u_int32_t   olt_esize;  /* size of this extent      */
    vx_daddr_t  olt_next[2];    /* addr of next extent, replica */
    u_int32_t   olt_nsize;  /* size of next extent      */
    u_int32_t   __unused2;  /* align to 8 byte boundary */
};

/*
 * VxFS common OLT entry (on disk).
 */
struct vxfs_oltcommon {
    u_int32_t   olt_type;   /* type of this record      */
    u_int32_t   olt_size;   /* size of this record      */
};

/*
 * VxFS free OLT entry (on disk).
 */
struct vxfs_oltfree {
    u_int32_t   olt_type;   /* type of this record      */
    u_int32_t   olt_fsize;  /* size of this free record */
};

/*
 * VxFS initial-inode list (on disk).
 */
struct vxfs_oltilist {
    u_int32_t   olt_type;   /* type of this record      */
    u_int32_t   olt_size;   /* size of this record      */
    vx_ino_t    olt_iext[2];    /* initial inode list, replica  */
};

/*
 * Current Usage Table 
 */
struct vxfs_oltcut {
    u_int32_t   olt_type;   /* type of this record      */
    u_int32_t   olt_size;   /* size of this record      */
    vx_ino_t    olt_cutino; /* inode of current usage table */
    u_int32_t   __pad;      /* unused, 8 byte align     */
};

/*
 * Inodes containing Superblock, Intent log and OLTs 
 */
struct vxfs_oltsb {
    u_int32_t   olt_type;   /* type of this record      */
    u_int32_t   olt_size;   /* size of this record      */
    vx_ino_t    olt_sbino;  /* inode of superblock file */
    u_int32_t   __unused1;  /* ???              */
    vx_ino_t    olt_logino[2];  /* inode of log file,replica    */
    vx_ino_t    olt_oltino[2];  /* inode of OLT, replica    */
};

/*
 * Inode containing device configuration + it's replica 
 */
struct vxfs_oltdev {
    u_int32_t   olt_type;   /* type of this record      */
    u_int32_t   olt_size;   /* size of this record      */
    vx_ino_t    olt_devino[2];  /* inode of device config files */
};

/*
 * Fileset header 
 */
struct vxfs_oltfshead {
    u_int32_t   olt_type;   /* type number          */
    u_int32_t   olt_size;   /* size of this record      */
    vx_ino_t    olt_fsino[2];   /* inodes of fileset header */
};

#endif /* _VXFS_OLT_H_ */