sys/vfs/nullfs/null.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. 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  *      @(#)null.h      8.3 (Berkeley) 8/20/94
  33  *
  34  * $FreeBSD: src/sys/miscfs/nullfs/null.h,v 1.11.2.3 2001/06/26 04:20:09 bp Exp $
  35  * $DragonFly: src/sys/vfs/nullfs/null.h,v 1.10 2008/09/18 16:08:32 dillon Exp $
  36  */
  37
  38 struct null_args {
  39         char            *target;        /* Target of loopback  */
  40         struct export_args export;      /* Network export information */
  41 };
  42
  43 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  44
  45 struct null_mount {
  46         struct mount    *nullm_vfs;
  47         struct vnode    *nullm_rootvp;  /* Reference to root null_node */
  48         struct netexport export;
  49 };
  50
  51 #endif
  52
  53 #ifdef _KERNEL
  54 #define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
  55
  56 #ifdef NULLFS_DEBUG
  57 #define NULLFSDEBUG(format, args...) kprintf(format ,## args)
  58 #else
  59 #define NULLFSDEBUG(format, args...)
  60 #endif /* NULLFS_DEBUG */
  61
  62 int nullfs_export(struct mount *mp, int op,
  63               const struct export_args *export);
  64
  65 #endif /* _KERNEL */