/*      $NetBSD: tmpfs_specops.c,v 1.16 2021/07/19 01:30:25 dholland Exp $      */

/*
 * Copyright (c) 2005 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
 * 2005 program.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * tmpfs vnode interface for special devices.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tmpfs_specops.c,v 1.16 2021/07/19 01:30:25 dholland Exp $");

#include <sys/param.h>
#include <sys/vnode.h>

#include <fs/tmpfs/tmpfs.h>
#include <fs/tmpfs/tmpfs_specops.h>

/*
 * vnode operations vector used for special devices stored in a tmpfs
 * file system.
 */

int (**tmpfs_specop_p)(void *);

const struct vnodeopv_entry_desc tmpfs_specop_entries[] = {
        { &vop_default_desc,            vn_default_error },
        GENFS_SPECOP_ENTRIES,
        { &vop_close_desc,              tmpfs_spec_close },
        { &vop_access_desc,             tmpfs_access },
        { &vop_accessx_desc,            genfs_accessx },
        { &vop_getattr_desc,            tmpfs_getattr },
        { &vop_setattr_desc,            tmpfs_setattr },
        { &vop_read_desc,               tmpfs_spec_read },
        { &vop_write_desc,              tmpfs_spec_write },
        { &vop_fcntl_desc,              genfs_fcntl },
        { &vop_fsync_desc,              spec_fsync },
        { &vop_inactive_desc,           tmpfs_inactive },
        { &vop_reclaim_desc,            tmpfs_reclaim },
        { &vop_lock_desc,               genfs_lock },
        { &vop_unlock_desc,             genfs_unlock },
        { &vop_print_desc,              tmpfs_print },
        { &vop_islocked_desc,           genfs_islocked },
        { &vop_bwrite_desc,             vn_bwrite },
        { NULL, NULL }
};

const struct vnodeopv_desc tmpfs_specop_opv_desc = {
        &tmpfs_specop_p, tmpfs_specop_entries
};

int
tmpfs_spec_close(void *v)
{
        struct vop_close_args /* {
                struct vnode    *a_vp;
                int             a_fflag;
                kauth_cred_t    a_cred;
        } */ *ap __unused = v;

        return VOCALL(spec_vnodeop_p, VOFFSET(vop_close), v);
}

int
tmpfs_spec_read(void *v)
{
        struct vop_read_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int a_ioflag;
                kauth_cred_t a_cred;
        } */ *ap = v;
        vnode_t *vp = ap->a_vp;

        tmpfs_update(vp, TMPFS_UPDATE_ATIME);
        return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v);
}

int
tmpfs_spec_write(void *v)
{
        struct vop_write_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int a_ioflag;
                kauth_cred_t a_cred;
        } */ *ap = v;
        vnode_t *vp = ap->a_vp;

        tmpfs_update(vp, TMPFS_UPDATE_MTIME);
        return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v);
}