The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/fdescfs/fdesc.h

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    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  * $FreeBSD: releng/12.0/sys/fs/fdescfs/fdesc.h 326023 2017-11-20 19:43:44Z pfg $
   37  */
   38 
   39 #ifndef _FS_FDESC_H_
   40 #define _FS_FDESC_H_
   41 
   42 /* Private mount flags for fdescfs. */
   43 #define FMNT_UNMOUNTF   0x01
   44 #define FMNT_LINRDLNKF  0x02
   45 
   46 struct fdescmount {
   47         struct vnode    *f_root;        /* Root node */
   48         int flags;
   49 };
   50 
   51 #define FD_ROOT         1
   52 #define FD_DESC         3
   53 
   54 typedef enum {
   55         Froot,
   56         Fdesc
   57 } fdntype;
   58 
   59 struct 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 
   67 extern struct mtx fdesc_hashmtx;
   68 #define VFSTOFDESC(mp)  ((struct fdescmount *)((mp)->mnt_data))
   69 #define VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
   70 
   71 extern vfs_init_t fdesc_init;
   72 extern vfs_uninit_t fdesc_uninit;
   73 extern int fdesc_allocvp(fdntype, unsigned, int, struct mount *,
   74     struct vnode **);
   75 #endif /* !_FS_FDESC_H_ */

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