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

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