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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software donated to Berkeley by
      * Jan-Simon Pendry.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)fdesc.h     8.5 (Berkeley) 1/21/94
     *
     * $FreeBSD$
     */
    
    #ifndef _FS_FDESC_H_
    #define _FS_FDESC_H_
    
    /* Private mount flags for fdescfs. */
    #define FMNT_UNMOUNTF   0x01
    #define FMNT_LINRDLNKF  0x02
    #define FMNT_NODUP      0x04
    
    struct fdescmount {
            struct vnode    *f_root;        /* Root node */
            int flags;
    };
    
    #define FD_ROOT         1
    #define FD_DESC         3
    
    typedef enum {
            Froot,
            Fdesc
    } fdntype;
    
    struct fdescnode {
            LIST_ENTRY(fdescnode) fd_hash;  /* Hash list */
            struct vnode    *fd_vnode;      /* Back ptr to vnode */
            fdntype         fd_type;        /* Type of this node */
            unsigned        fd_fd;          /* Fd to be dup'ed */
            int             fd_ix;          /* filesystem index */
    };
    
    extern struct mtx fdesc_hashmtx;
    #define VFSTOFDESC(mp)  ((struct fdescmount *)((mp)->mnt_data))
    #define VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
    
    extern vfs_init_t fdesc_init;
    extern vfs_uninit_t fdesc_uninit;
    extern int fdesc_allocvp(fdntype, unsigned, int, struct mount *,
        struct vnode **);
    #endif /* !_FS_FDESC_H_ */

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