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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1992, 1993
28: * The Regents of the University of California. All rights reserved.
29: *
30: * This code is derived from software donated to Berkeley by
31: * Jan-Simon Pendry.
32: *
33: * Redistribution and use in source and binary forms, with or without
34: * modification, are permitted provided that the following conditions
35: * are met:
36: * 1. Redistributions of source code must retain the above copyright
37: * notice, this list of conditions and the following disclaimer.
38: * 2. Redistributions in binary form must reproduce the above copyright
39: * notice, this list of conditions and the following disclaimer in the
40: * documentation and/or other materials provided with the distribution.
41: * 3. All advertising materials mentioning features or use of this software
42: * must display the following acknowledgement:
43: * This product includes software developed by the University of
44: * California, Berkeley and its contributors.
45: * 4. Neither the name of the University nor the names of its contributors
46: * may be used to endorse or promote products derived from this software
47: * without specific prior written permission.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59: * SUCH DAMAGE.
60: *
61: * @(#)null.h 8.3 (Berkeley) 8/20/94
62: *
63: * null.h 8.2 (Berkeley) 1/21/94
64: */
65:
66: struct null_args {
67: char *target; /* Target of loopback */
68: };
69:
70: struct null_mount {
71: struct mount *nullm_vfs;
72: struct vnode *nullm_rootvp; /* Reference to root null_node */
73: };
74:
75: #ifdef _KERNEL
76: /*
77: * A cache of vnode references
78: */
79: struct null_node {
80: LIST_ENTRY(null_node) null_hash; /* Hash list */
81: struct vnode *null_lowervp; /* VREFed once */
82: struct vnode *null_vnode; /* Back pointer */
83: };
84:
85: extern int null_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp));
86:
87: #define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
88: #define VTONULL(vp) ((struct null_node *)(vp)->v_data)
89: #define NULLTOV(xp) ((xp)->null_vnode)
90: #ifdef NULLFS_DIAGNOSTIC
91: extern struct vnode *null_checkvp __P((struct vnode *vp, char *fil, int lno));
92: #define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
93: #else
94: #define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
95: #endif
96:
97: extern int (**null_vnodeop_p)();
98: extern struct vfsops null_vfsops;
99: #endif /* _KERNEL */
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