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76 lines
3.0 KiB
C
76 lines
3.0 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)null.h 8.2 (Berkeley) 1/21/94
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*
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* $Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp jsp $
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*/
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struct null_args {
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char *target; /* Target of loopback */
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};
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struct null_mount {
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struct mount *nullm_vfs;
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struct vnode *nullm_rootvp; /* Reference to root null_node */
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};
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#ifdef KERNEL
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/*
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* A cache of vnode references
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*/
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struct null_node {
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struct null_node *null_forw; /* Hash chain */
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struct null_node *null_back;
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struct vnode *null_lowervp; /* VREFed once */
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struct vnode *null_vnode; /* Back pointer */
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};
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extern int null_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp));
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#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
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#define VTONULL(vp) ((struct null_node *)(vp)->v_data)
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#define NULLTOV(xp) ((xp)->null_vnode)
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#ifdef NULLFS_DIAGNOSTIC
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extern struct vnode *null_checkvp __P((struct vnode *vp, char *fil, int lno));
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#define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
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#else
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#define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
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#endif
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extern int (**null_vnodeop_p)();
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extern struct vfsops null_vfsops;
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#endif /* KERNEL */
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