126 lines
5.2 KiB
C
126 lines
5.2 KiB
C
/* $NetBSD: overlay.h,v 1.9 2017/04/11 07:51:37 hannken Exp $ */
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/*
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* Copyright (c) 1999 National Aeronautics & Space Administration
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* All rights reserved.
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*
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* This software was written by William Studenmund of the
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* Numerical Aerospace Simulation Facility, NASA Ames Research Center.
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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. Neither the name of the National Aeronautics & Space Administration
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* nor the names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB-
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* UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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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. 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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* from: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp
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* @(#)null.h 8.2 (Berkeley) 1/21/94
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*/
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#include <miscfs/genfs/layer.h>
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struct overlay_args {
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struct layer_args la; /* generic layerfs args */
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};
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/*
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* We leave ova_target for two reasons. One, we can tell the difference
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* between a mount_overlay -u and a call from mountd as the former will
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* pass a pointer to a string while the latter will pass NULL. Two,
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* filesystems based on the overlay layer might have use for it.
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*/
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#define ova_target la.target
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#define ova_export la.export
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#ifdef _KERNEL
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struct overlay_mount {
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struct layer_mount lm; /* generic layerfs mount stuff */
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};
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#define ovm_rootvp lm.layerm_rootvp
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#define ovm_export lm.layerm_export
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#define ovm_flags lm.layerm_flags
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#define ovm_size lm.layerm_size
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#define ovm_tag lm.layerm_tag
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#define ovm_bypass lm.layerm_bypass
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#define ovm_alloc lm.layerm_alloc
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#define ovm_vnodeop_p lm.layerm_vnodeop_p
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#define ovm_node_hashtbl lm.layerm_node_hashtbl
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#define ovm_node_hash lm.layerm_node_hash
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#define ovm_hashlock lm.layerm_hashlock
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/*
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* A cache of vnode references
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*/
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struct overlay_node {
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struct layer_node ln;
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};
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#define ov_hash ln.layer_hash
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#define ov_lowervp ln.layer_lowervp
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#define ov_vnode ln.layer_vnode
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#define ov_flags ln.layer_flags
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#define MOUNTTOOVERLAYMOUNT(mp) ((struct overlay_mount *)((mp)->mnt_data))
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#define VTOOVERLAY(vp) ((struct overlay_node *)(vp)->v_data)
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#define OVERLAYTOV(xp) ((xp)->ov_vnode)
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#ifdef OVERLAYFS_DIAGNOSTIC
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extern struct vnode *layer_checkvp(struct vnode *vp, char *fil, int lno);
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#define OVERLAYVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__)
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#else
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#define OVERLAYVPTOLOWERVP(vp) (VTOOVERLAY(vp)->ov_lowervp)
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#endif
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extern int (**overlay_vnodeop_p)(void *);
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extern struct vfsops overlay_vfsops;
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#endif /* _KERNEL */
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