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. 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 #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 44 struct fdescmount { 45 struct vnode *f_root; /* Root node */ 46 int flags; 47 }; 48 49 #define FD_ROOT 1 50 #define FD_DESC 3 51 52 typedef enum { 53 Froot, 54 Fdesc 55 } fdntype; 56 57 struct 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 65 extern struct mtx fdesc_hashmtx; 66 #define VFSTOFDESC(mp) ((struct fdescmount *)((mp)->mnt_data)) 67 #define VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data) 68 69 extern vfs_init_t fdesc_init; 70 extern vfs_uninit_t fdesc_uninit; 71 extern int fdesc_allocvp(fdntype, unsigned, int, struct mount *, 72 struct vnode **); 73 #endif /* !_FS_FDESC_H_ */ 74