FreeBSD/Linux Kernel Cross Reference
sys/fs/nullfs/null.h
1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)null.h 8.3 (Berkeley) 8/20/94
33 *
34 * $FreeBSD: releng/6.0/sys/fs/nullfs/null.h 143642 2005-03-15 13:49:33Z jeff $
35 */
36
37 struct null_mount {
38 struct mount *nullm_vfs;
39 struct vnode *nullm_rootvp; /* Reference to root null_node */
40 };
41
42 #ifdef _KERNEL
43 /*
44 * A cache of vnode references
45 */
46 struct null_node {
47 LIST_ENTRY(null_node) null_hash; /* Hash list */
48 struct vnode *null_lowervp; /* VREFed once */
49 struct vnode *null_vnode; /* Back pointer */
50 };
51
52 #define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
53 #define VTONULL(vp) ((struct null_node *)(vp)->v_data)
54 #define NULLTOV(xp) ((xp)->null_vnode)
55
56 int nullfs_init(struct vfsconf *vfsp);
57 int nullfs_uninit(struct vfsconf *vfsp);
58 int null_nodeget(struct mount *mp, struct vnode *target, struct vnode **vpp);
59 void null_hashrem(struct null_node *xp);
60 int null_bypass(struct vop_generic_args *ap);
61
62 #ifdef DIAGNOSTIC
63 struct vnode *null_checkvp(struct vnode *vp, char *fil, int lno);
64 #define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
65 #else
66 #define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
67 #endif
68
69 extern struct vop_vector null_vnodeops;
70
71 #ifdef MALLOC_DECLARE
72 MALLOC_DECLARE(M_NULLFSNODE);
73 #endif
74
75 #ifdef NULLFS_DEBUG
76 #define NULLFSDEBUG(format, args...) printf(format ,## args)
77 #else
78 #define NULLFSDEBUG(format, args...)
79 #endif /* NULLFS_DEBUG */
80
81 #endif /* _KERNEL */
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