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
35#ifndef _FS_FDESC_H_
36#define _FS_FDESC_H_
37
38/* Private mount flags for fdescfs. */
39#define FMNT_UNMOUNTF 0x01
40#define FMNT_LINRDLNKF 0x02
41#define FMNT_NODUP 0x04
42#define FMNT_RDLNKF 0x08
43
44struct fdescmount {
45 struct vnode *f_root; /* Root node */
46 int flags;
47};
48
49#define FD_ROOT 1
50#define FD_DESC 3
51
52typedef enum {
53 Froot,
54 Fdesc
55} fdntype;
56
57struct fdescnode {
58 LIST_ENTRY(fdescnode) fd_hash; /* Hash list */
59 struct vnode *fd_vnode; /* Back ptr to vnode */
60 fdntype fd_type; /* Type of this node */
61 unsigned fd_fd; /* Fd to be dup'ed */
62 int fd_ix; /* filesystem index */
63};
64
65extern struct mtx fdesc_hashmtx;
66#define VFSTOFDESC(mp) ((struct fdescmount *)((mp)->mnt_data))
67#define VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
68
69extern vfs_init_t fdesc_init;
70extern vfs_uninit_t fdesc_uninit;
71extern int fdesc_allocvp(fdntype, unsigned, int, struct mount *,
72 struct vnode **);
73#endif /* !_FS_FDESC_H_ */