sys/vfs/fdesc/fdesc.h

   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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)fdesc.h     8.5 (Berkeley) 1/21/94
  37  *
  38  * $FreeBSD: src/sys/miscfs/fdesc/fdesc.h,v 1.8.2.1 2001/10/22 22:49:26 chris Exp $
  39  * $DragonFly: src/sys/vfs/fdesc/fdesc.h,v 1.6 2006/05/06 18:48:52 dillon Exp $
  40  */
  41
  42 #ifdef _KERNEL
  43 struct fdescmount {
  44         struct vnode    *f_root;        /* Root node */
  45 };
  46
  47 #define FD_ROOT         1
  48 #define FD_DESC         3
  49
  50 typedef enum {
  51         Froot,
  52         Fdesc
  53 } fdntype;
  54
  55 struct fdescnode {
  56         LIST_ENTRY(fdescnode) fd_hash;  /* Hash list */
  57         struct vnode    *fd_vnode;      /* Back ptr to vnode */
  58         fdntype         fd_type;        /* Type of this node */
  59         unsigned        fd_fd;          /* Fd to be dup'ed */
  60         int             fd_ix;          /* filesystem index */
  61 };
  62
  63 #define VFSTOFDESC(mp)  ((struct fdescmount *)((mp)->mnt_data))
  64 #define VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
  65
  66 extern int fdesc_init (struct vfsconf *);
  67 extern int fdesc_uninit (struct vfsconf *);
  68 extern int fdesc_root (struct mount *, struct vnode **);
  69 extern int fdesc_allocvp (fdntype, int, struct mount *, struct vnode **);
  70 #endif /* _KERNEL */