Allow null mounts to accept -o update
[dragonfly.git] / sys / vfs / nullfs / null.h
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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 * 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.
23 *
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
34 * SUCH DAMAGE.
35 *
36 * @(#)null.h 8.3 (Berkeley) 8/20/94
37 *
38 * $FreeBSD: src/sys/miscfs/nullfs/null.h,v 1.11.2.3 2001/06/26 04:20:09 bp Exp $
91117902 39 * $DragonFly: src/sys/vfs/nullfs/null.h,v 1.10 2008/09/18 16:08:32 dillon Exp $
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40 */
41
42struct null_args {
43 char *target; /* Target of loopback */
8b02b69a 44 struct export_args export; /* Network export information */
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45};
46
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47#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
48
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49struct null_mount {
50 struct mount *nullm_vfs;
51 struct vnode *nullm_rootvp; /* Reference to root null_node */
67863d04 52 struct netexport export;
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53};
54
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55#endif
56
984263bc 57#ifdef _KERNEL
984263bc 58#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
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59
60#ifdef NULLFS_DEBUG
086c1d7e 61#define NULLFSDEBUG(format, args...) kprintf(format ,## args)
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62#else
63#define NULLFSDEBUG(format, args...)
64#endif /* NULLFS_DEBUG */
65
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66int nullfs_export(struct mount *mp, int op,
67 const struct export_args *export);
68
984263bc 69#endif /* _KERNEL */