1/* $NetBSD: null.h,v 1.19 2010/07/02 03:16:01 rmind 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_vfs lm.layerm_vfs
87#define nullm_rootvp lm.layerm_rootvp
88#define nullm_export lm.layerm_export
89#define nullm_flags lm.layerm_flags
90#define nullm_size lm.layerm_size
91#define nullm_tag lm.layerm_tag
92#define nullm_bypass lm.layerm_bypass
93#define nullm_alloc lm.layerm_alloc
94#define nullm_vnodeop_p lm.layerm_vnodeop_p
95#define nullm_node_hashtbl lm.layerm_node_hashtbl
96#define nullm_node_hash lm.layerm_node_hash
97#define nullm_hashlock lm.layerm_hashlock
98
99/*
100 * A cache of vnode references
101 */
102struct null_node {
103 struct layer_node ln;
104};
105#define null_hash ln.layer_hash
106#define null_lowervp ln.layer_lowervp
107#define null_vnode ln.layer_vnode
108#define null_flags ln.layer_flags
109
110#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
111
112extern int (**null_vnodeop_p)(void *);
113extern struct vfsops nullfs_vfsops;
114
115void nullfs_init(void);
116
117#endif /* _KERNEL */
118#endif /* _MISCFS_NULLFS_H_ */
119