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/*

 * Copyright (c) 2006-2007, Kohsuke Ohtani

 * 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.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the author nor the names of any co-contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * 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.

 */

/*

 * arfs_vfsops.c - vfs operations for archive file system.

 */

#include <sys/vnode.h>

#include <sys/mount.h>

#include <sys/param.h>

#include <sys/buf.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <ar.h>

#include "arfs.h"

extern struct vnops arfs_vnops;

static int arfs_mount        (mount_t mp, char *dev, int flags, void *data);

static int arfs_unmount        (mount_t mp);

#define arfs_sync        ((vfsop_sync_t)vfs_nullop)

#define arfs_vget        ((vfsop_vget_t)vfs_nullop)

#define arfs_statfs        ((vfsop_statfs_t)vfs_nullop)

/*

 * File system operations

 */

const struct vfsops arfs_vfsops = {

        arfs_mount,                /* mount */

        arfs_unmount,                /* unmount */

        arfs_sync,                /* sync */

        arfs_vget,                /* vget */

        arfs_statfs,                /* statfs */

        &arfs_vnops,                /* vnops */

};

/*

 * Mount a file system.

 */

static int

arfs_mount(mount_t mp, char *dev, int flags, void *data)

{

        size_t size;

        char *buf;

        int error = 0;

        DPRINTF(("arfs_mount: dev=%s\n", dev));

        if ((buf = malloc(BSIZE)) == NULL)

                return ENOMEM;

        /* Read first block */

        size = BSIZE;

        error = device_read((device_t)mp->m_dev, buf, &size, 0);

        if (error) {

                DPRINTF(("arfs_mount: read error=%d\n", error));

                goto out;

        }

        /* Check if the device includes valid archive image. */

        if (strncmp(buf, ARMAG, SARMAG)) {

                DPRINTF(("arfs_mount: invalid archive image!\n"));

                error = EINVAL;

                goto out;

        }

        /* Ok, we find the archive */

        mp->m_flags |= MNT_RDONLY;

 out:

        free(buf);

        return error;

}

static int

arfs_unmount(mount_t mp)

{

        return 0;

}