xref: /netbsd-src/sys/fs/tmpfs/tmpfs_specops.c (revision f55bbd277c034df6ffd2fd48cb40d5b983d8414b)

/*	$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);
}