2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software donated to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)null.h 8.3 (Berkeley) 8/20/94
38 * $FreeBSD: src/sys/miscfs/nullfs/null.h,v 1.11.2.3 2001/06/26 04:20:09 bp Exp $
39 * $DragonFly: src/sys/vfs/nullfs/null.h,v 1.6 2004/08/28 19:02:23 dillon Exp $
43 char *target; /* Target of loopback */
47 struct mount *nullm_vfs;
48 struct vnode *nullm_rootvp; /* Reference to root null_node */
53 * A cache of vnode references
56 struct null_node *null_next; /* Hash list */
57 struct vnode *null_lowervp; /* vrefed once */
58 struct vnode *null_vnode; /* Back pointer */
61 #define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
62 #define VTONULL(vp) ((struct null_node *)(vp)->v_data)
63 #define NULLTOV(xp) ((xp)->null_vnode)
65 int nullfs_init(struct vfsconf *vfsp);
66 int nullfs_uninit(struct vfsconf *vfsp);
67 int null_node_add(struct null_node *np);
68 void null_node_rem(struct null_node *np);
69 int null_node_create(struct mount *mp, struct vnode *target, struct vnode **vpp);
70 int null_bypass(struct vop_generic_args *ap);
73 struct vnode *null_checkvp(struct vnode *vp, char *fil, int lno);
74 #define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
76 #define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
80 MALLOC_DECLARE(M_NULLFSNODE);
84 #define NULLFSDEBUG(format, args...) printf(format ,## args)
86 #define NULLFSDEBUG(format, args...)
87 #endif /* NULLFS_DEBUG */