1/*-
 2 * SPDX-License-Identifier: BSD-3-Clause
 3 *
 4 * Copyright (c) 1992, 1993
 5 *	The Regents of the University of California.  All rights reserved.
 6 *
 7 * This code is derived from software donated to Berkeley by
 8 * Jan-Simon Pendry.
 9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	@(#)fdesc.h	8.5 (Berkeley) 1/21/94
35 */
36
37#ifndef _FS_FDESC_H_
38#define _FS_FDESC_H_
39
40/* Private mount flags for fdescfs. */
41#define FMNT_UNMOUNTF	0x01
42#define FMNT_LINRDLNKF	0x02
43#define	FMNT_NODUP	0x04
44#define FMNT_RDLNKF	0x08
45
46struct fdescmount {
47	struct vnode	*f_root;	/* Root node */
48	int flags;
49};
50
51#define FD_ROOT		1
52#define FD_DESC		3
53
54typedef enum {
55	Froot,
56	Fdesc
57} fdntype;
58
59struct fdescnode {
60	LIST_ENTRY(fdescnode) fd_hash;	/* Hash list */
61	struct vnode	*fd_vnode;	/* Back ptr to vnode */
62	fdntype		fd_type;	/* Type of this node */
63	unsigned	fd_fd;		/* Fd to be dup'ed */
64	int		fd_ix;		/* filesystem index */
65};
66
67extern struct mtx fdesc_hashmtx;
68#define VFSTOFDESC(mp)	((struct fdescmount *)((mp)->mnt_data))
69#define	VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
70
71extern vfs_init_t fdesc_init;
72extern vfs_uninit_t fdesc_uninit;
73extern int fdesc_allocvp(fdntype, unsigned, int, struct mount *,
74    struct vnode **);
75#endif /* !_FS_FDESC_H_ */