1/*	$NetBSD: null.h,v 1.20 2017/04/11 07:51:37 hannken Exp $	*/
  2
  3/*
  4 * Copyright (c) 1999 National Aeronautics & Space Administration
  5 * All rights reserved.
  6 *
  7 * This software was written by William Studenmund of the
  8 * Numerical Aerospace Simulation Facility, NASA Ames Research Center.
  9 *
 10 * Redistribution and use in source and binary forms, with or without
 11 * modification, are permitted provided that the following conditions
 12 * are met:
 13 * 1. Redistributions of source code must retain the above copyright
 14 *    notice, this list of conditions and the following disclaimer.
 15 * 2. Redistributions in binary form must reproduce the above copyright
 16 *    notice, this list of conditions and the following disclaimer in the
 17 *    documentation and/or other materials provided with the distribution.
 18 * 3. Neither the name of the National Aeronautics & Space Administration
 19 *    nor the names of its contributors may be used to endorse or promote
 20 *    products derived from this software without specific prior written
 21 *    permission.
 22 *
 23 * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION
 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 26 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB-
 27 * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 28 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 33 * POSSIBILITY OF SUCH DAMAGE.
 34 */
 35
 36/*
 37 * Copyright (c) 1992, 1993
 38 *	The Regents of the University of California.  All rights reserved.
 39 *
 40 * This code is derived from software donated to Berkeley by
 41 * Jan-Simon Pendry.
 42 *
 43 * Redistribution and use in source and binary forms, with or without
 44 * modification, are permitted provided that the following conditions
 45 * are met:
 46 * 1. Redistributions of source code must retain the above copyright
 47 *    notice, this list of conditions and the following disclaimer.
 48 * 2. Redistributions in binary form must reproduce the above copyright
 49 *    notice, this list of conditions and the following disclaimer in the
 50 *    documentation and/or other materials provided with the distribution.
 51 * 3. Neither the name of the University nor the names of its contributors
 52 *    may be used to endorse or promote products derived from this software
 53 *    without specific prior written permission.
 54 *
 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 58 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 65 * SUCH DAMAGE.
 66 *
 67 *	from: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp
 68 *	@(#)null.h	8.2 (Berkeley) 1/21/94
 69 */
 70
 71#ifndef _MISCFS_NULLFS_H_
 72#define _MISCFS_NULLFS_H_
 73
 74#include <miscfs/genfs/layer.h>
 75
 76struct null_args {
 77	struct	layer_args	la;	/* generic layerfs args */
 78};
 79#define	nulla_target	la.target
 80#define	nulla_export	la.export
 81
 82#ifdef _KERNEL
 83struct null_mount {
 84	struct	layer_mount	lm;	/* generic layerfs mount stuff */
 85};
 86#define	nullm_rootvp		lm.layerm_rootvp
 87#define	nullm_export		lm.layerm_export
 88#define	nullm_flags		lm.layerm_flags
 89#define	nullm_size		lm.layerm_size
 90#define	nullm_tag		lm.layerm_tag
 91#define	nullm_bypass		lm.layerm_bypass
 92#define	nullm_alloc		lm.layerm_alloc
 93#define	nullm_vnodeop_p		lm.layerm_vnodeop_p
 94#define	nullm_node_hashtbl	lm.layerm_node_hashtbl
 95#define	nullm_node_hash		lm.layerm_node_hash
 96#define	nullm_hashlock		lm.layerm_hashlock
 97
 98/*
 99 * A cache of vnode references
100 */
101struct null_node {
102	struct	layer_node	ln;
103};
104#define	null_hash	ln.layer_hash
105#define	null_lowervp	ln.layer_lowervp
106#define	null_vnode	ln.layer_vnode
107#define	null_flags	ln.layer_flags
108
109#define	MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
110
111extern int (**null_vnodeop_p)(void *);
112extern struct vfsops nullfs_vfsops;
113
114void nullfs_init(void);
115
116#endif /* _KERNEL */
117#endif /* _MISCFS_NULLFS_H_ */