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/* $OpenBSD: null.h,v 1.13 2003/06/02 23:28:10 millert Exp $ */
/* $NetBSD: null.h,v 1.13 2001/11/07 04:56:09 enami Exp $ */
/*
* Copyright (c) 1999 National Aeronautics & Space Administration
* All rights reserved.
*
* This software was written by William Studenmund of the
* Numerical Aerospace Simulation Facility, NASA Ames Research Center.
*
* 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 National Aeronautics & Space Administration
* 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 NATIONAL AERONAUTICS & SPACE ADMINISTRATION
* ``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 ADMINISTRATION OR CONTRIB-
* UTORS 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.
*/
/*
* 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.
*
* from: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp
* @(#)null.h 8.2 (Berkeley) 1/21/94
*/
#include <miscfs/genfs/layer.h>
struct null_args {
struct layer_args la; /* generic layerfs args */
};
#define nulla_target la.target
#define nulla_export la.export
#ifdef _KERNEL
struct null_mount {
struct layer_mount lm; /* generic layerfs mount stuff */
};
#define nullm_vfs lm.layerm_vfs
#define nullm_rootvp lm.layerm_rootvp
#define nullm_export lm.layerm_export
#define nullm_flags lm.layerm_flags
#define nullm_size lm.layerm_size
#define nullm_tag lm.layerm_tag
#define nullm_bypass lm.layerm_bypass
#define nullm_alloc lm.layerm_alloc
#define nullm_vnodeop_p lm.layerm_vnodeop_p
#define nullm_node_hashtbl lm.layerm_node_hashtbl
#define nullm_node_hash lm.layerm_node_hash
#define nullm_hashlock lm.layerm_hashlock
/*
* A cache of vnode references
*/
struct null_node {
struct layer_node ln;
};
#define null_hash ln.layer_hash
#define null_lowervp ln.layer_lowervp
#define null_vnode ln.layer_vnode
#define null_flags ln.layer_flags
int null_node_create(struct mount *, struct vnode *,
struct vnode **, int);
#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
#define VTONULL(vp) ((struct null_node *)(vp)->v_data)
#define NULLTOV(xp) ((xp)->null_vnode)
#ifdef NULLFS_DIAGNOSTIC
struct vnode *layer_checkvp(struct vnode *, char *, int);
#define NULLVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__)
#else
#define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
#endif
extern int (**nullfs_vnodeop_p)(void *);
extern struct vfsops nullfs_vfsops;
int nullfs_init(struct vfsconf *);
#endif /* _KERNEL */
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