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null.h revision 1.19 
      1 /*	$NetBSD: null.h,v 1.19 2010/07/02 03:16:01 rmind Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1999 National Aeronautics & Space Administration
      5  * All rights reserved.
      6  *
      7  * This software was written by William Studenmund of the
      8  * Numerical Aerospace Simulation Facility, NASA Ames Research Center.
      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 National Aeronautics & Space Administration
     19  *    nor the names of its contributors may be used to endorse or promote
     20  *    products derived from this software without specific prior written
     21  *    permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION
     24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB-
     27  * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     28  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     33  * POSSIBILITY OF SUCH DAMAGE.
     34  */
     35 
     36 /*
     37  * Copyright (c) 1992, 1993
     38  *	The Regents of the University of California.  All rights reserved.
     39  *
     40  * This code is derived from software donated to Berkeley by
     41  * Jan-Simon Pendry.
     42  *
     43  * Redistribution and use in source and binary forms, with or without
     44  * modification, are permitted provided that the following conditions
     45  * are met:
     46  * 1. Redistributions of source code must retain the above copyright
     47  *    notice, this list of conditions and the following disclaimer.
     48  * 2. Redistributions in binary form must reproduce the above copyright
     49  *    notice, this list of conditions and the following disclaimer in the
     50  *    documentation and/or other materials provided with the distribution.
     51  * 3. Neither the name of the University nor the names of its contributors
     52  *    may be used to endorse or promote products derived from this software
     53  *    without specific prior written permission.
     54  *
     55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     65  * SUCH DAMAGE.
     66  *
     67  *	from: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp
     68  *	@(#)null.h	8.2 (Berkeley) 1/21/94
     69  */
     70 
     71 #ifndef _MISCFS_NULLFS_H_
     72 #define _MISCFS_NULLFS_H_
     73 
     74 #include <miscfs/genfs/layer.h>
     75 
     76 struct null_args {
     77 	struct	layer_args	la;	/* generic layerfs args */
     78 };
     79 #define	nulla_target	la.target
     80 #define	nulla_export	la.export
     81 
     82 #ifdef _KERNEL
     83 struct null_mount {
     84 	struct	layer_mount	lm;	/* generic layerfs mount stuff */
     85 };
     86 #define	nullm_vfs		lm.layerm_vfs
     87 #define	nullm_rootvp		lm.layerm_rootvp
     88 #define	nullm_export		lm.layerm_export
     89 #define	nullm_flags		lm.layerm_flags
     90 #define	nullm_size		lm.layerm_size
     91 #define	nullm_tag		lm.layerm_tag
     92 #define	nullm_bypass		lm.layerm_bypass
     93 #define	nullm_alloc		lm.layerm_alloc
     94 #define	nullm_vnodeop_p		lm.layerm_vnodeop_p
     95 #define	nullm_node_hashtbl	lm.layerm_node_hashtbl
     96 #define	nullm_node_hash		lm.layerm_node_hash
     97 #define	nullm_hashlock		lm.layerm_hashlock
     98 
     99 /*
    100  * A cache of vnode references
    101  */
    102 struct null_node {
    103 	struct	layer_node	ln;
    104 };
    105 #define	null_hash	ln.layer_hash
    106 #define	null_lowervp	ln.layer_lowervp
    107 #define	null_vnode	ln.layer_vnode
    108 #define	null_flags	ln.layer_flags
    109 
    110 #define	MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
    111 
    112 extern int (**null_vnodeop_p)(void *);
    113 extern struct vfsops nullfs_vfsops;
    114 
    115 void nullfs_init(void);
    116 
    117 #endif /* _KERNEL */
    118 #endif /* _MISCFS_NULLFS_H_ */
    119