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 *	@(#)fdesc.h	8.5 (Berkeley) 1/21/94
33 *
34 * $FreeBSD$
35 */
36
37#ifdef _KERNEL
38/* Private mount flags for fdescfs. */
39#define FMNT_UNMOUNTF 0x01
40struct fdescmount {
41	struct vnode	*f_root;	/* Root node */
42	int flags;
43};
44
45#define FD_ROOT		1
46#define FD_DESC		3
47
48typedef enum {
49	Froot,
50	Fdesc
51} fdntype;
52
53struct fdescnode {
54	LIST_ENTRY(fdescnode) fd_hash;	/* Hash list */
55	struct vnode	*fd_vnode;	/* Back ptr to vnode */
56	fdntype		fd_type;	/* Type of this node */
57	unsigned	fd_fd;		/* Fd to be dup'ed */
58	int		fd_ix;		/* filesystem index */
59};
60
61extern struct mtx fdesc_hashmtx;
62#define VFSTOFDESC(mp)	((struct fdescmount *)((mp)->mnt_data))
63#define	VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
64
65extern vfs_init_t fdesc_init;
66extern vfs_uninit_t fdesc_uninit;
67extern int fdesc_allocvp(fdntype, unsigned, int, struct mount *,
68    struct vnode **);
69#endif /* _KERNEL */
70