overlay.h revision 1.2.6.2
1 1.2.6.2 bouyer /* $NetBSD: overlay.h,v 1.2.6.2 2000/11/20 18:09:47 bouyer Exp $ */ 2 1.2.6.2 bouyer 3 1.2.6.2 bouyer /* 4 1.2.6.2 bouyer * Copyright (c) 1999 National Aeronautics & Space Administration 5 1.2.6.2 bouyer * All rights reserved. 6 1.2.6.2 bouyer * 7 1.2.6.2 bouyer * This software was written by William Studnemund of the 8 1.2.6.2 bouyer * Numerical Aerospace Similation Facility, NASA Ames Research Center. 9 1.2.6.2 bouyer * 10 1.2.6.2 bouyer * Redistribution and use in source and binary forms, with or without 11 1.2.6.2 bouyer * modification, are permitted provided that the following conditions 12 1.2.6.2 bouyer * are met: 13 1.2.6.2 bouyer * 1. Redistributions of source code must retain the above copyright 14 1.2.6.2 bouyer * notice, this list of conditions and the following disclaimer. 15 1.2.6.2 bouyer * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.6.2 bouyer * notice, this list of conditions and the following disclaimer in the 17 1.2.6.2 bouyer * documentation and/or other materials provided with the distribution. 18 1.2.6.2 bouyer * 3. Neither the name of the National Aeronautics & Space Administration 19 1.2.6.2 bouyer * nor the names of its contributors may be used to endorse or promote 20 1.2.6.2 bouyer * products derived from this software without specific prior written 21 1.2.6.2 bouyer * permission. 22 1.2.6.2 bouyer * 23 1.2.6.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION 24 1.2.6.2 bouyer * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 1.2.6.2 bouyer * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 1.2.6.2 bouyer * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB- 27 1.2.6.2 bouyer * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 28 1.2.6.2 bouyer * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 1.2.6.2 bouyer * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 1.2.6.2 bouyer * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 1.2.6.2 bouyer * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 1.2.6.2 bouyer * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 1.2.6.2 bouyer * POSSIBILITY OF SUCH DAMAGE. 34 1.2.6.2 bouyer */ 35 1.2.6.2 bouyer 36 1.2.6.2 bouyer /* 37 1.2.6.2 bouyer * Copyright (c) 1992, 1993 38 1.2.6.2 bouyer * The Regents of the University of California. All rights reserved. 39 1.2.6.2 bouyer * 40 1.2.6.2 bouyer * This code is derived from software donated to Berkeley by 41 1.2.6.2 bouyer * Jan-Simon Pendry. 42 1.2.6.2 bouyer * 43 1.2.6.2 bouyer * Redistribution and use in source and binary forms, with or without 44 1.2.6.2 bouyer * modification, are permitted provided that the following conditions 45 1.2.6.2 bouyer * are met: 46 1.2.6.2 bouyer * 1. Redistributions of source code must retain the above copyright 47 1.2.6.2 bouyer * notice, this list of conditions and the following disclaimer. 48 1.2.6.2 bouyer * 2. Redistributions in binary form must reproduce the above copyright 49 1.2.6.2 bouyer * notice, this list of conditions and the following disclaimer in the 50 1.2.6.2 bouyer * documentation and/or other materials provided with the distribution. 51 1.2.6.2 bouyer * 3. All advertising materials mentioning features or use of this software 52 1.2.6.2 bouyer * must display the following acknowledgement: 53 1.2.6.2 bouyer * This product includes software developed by the University of 54 1.2.6.2 bouyer * California, Berkeley and its contributors. 55 1.2.6.2 bouyer * 4. Neither the name of the University nor the names of its contributors 56 1.2.6.2 bouyer * may be used to endorse or promote products derived from this software 57 1.2.6.2 bouyer * without specific prior written permission. 58 1.2.6.2 bouyer * 59 1.2.6.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 1.2.6.2 bouyer * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 1.2.6.2 bouyer * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 1.2.6.2 bouyer * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 1.2.6.2 bouyer * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 1.2.6.2 bouyer * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 1.2.6.2 bouyer * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 1.2.6.2 bouyer * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 1.2.6.2 bouyer * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 1.2.6.2 bouyer * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 1.2.6.2 bouyer * SUCH DAMAGE. 70 1.2.6.2 bouyer * 71 1.2.6.2 bouyer * from: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp 72 1.2.6.2 bouyer * @(#)null.h 8.2 (Berkeley) 1/21/94 73 1.2.6.2 bouyer */ 74 1.2.6.2 bouyer 75 1.2.6.2 bouyer #include <miscfs/genfs/layer.h> 76 1.2.6.2 bouyer 77 1.2.6.2 bouyer struct overlay_args { 78 1.2.6.2 bouyer struct layer_args la; /* generic layerfs args */ 79 1.2.6.2 bouyer }; 80 1.2.6.2 bouyer /* 81 1.2.6.2 bouyer * We leave ova_target for two reasons. One, We can tell the difference 82 1.2.6.2 bouyer * between a mount_overlay -u and a call from mountd as the former will 83 1.2.6.2 bouyer * pass a pointer to a string while the latter will pass NULL. Two, 84 1.2.6.2 bouyer * filesystems based on the overlay layer might have use for it. 85 1.2.6.2 bouyer */ 86 1.2.6.2 bouyer #define ova_target la.target 87 1.2.6.2 bouyer #define ova_export la.export 88 1.2.6.2 bouyer 89 1.2.6.2 bouyer #ifdef _KERNEL 90 1.2.6.2 bouyer struct overlay_mount { 91 1.2.6.2 bouyer struct layer_mount lm; /* generic layerfs mount stuff */ 92 1.2.6.2 bouyer }; 93 1.2.6.2 bouyer #define ovm_vfs lm.layerm_vfs 94 1.2.6.2 bouyer #define ovm_rootvp lm.layerm_rootvp 95 1.2.6.2 bouyer #define ovm_export lm.layerm_export 96 1.2.6.2 bouyer #define ovm_flags lm.layerm_flags 97 1.2.6.2 bouyer #define ovm_size lm.layerm_size 98 1.2.6.2 bouyer #define ovm_tag lm.layerm_tag 99 1.2.6.2 bouyer #define ovm_bypass lm.layerm_bypass 100 1.2.6.2 bouyer #define ovm_alloc lm.layerm_alloc 101 1.2.6.2 bouyer #define ovm_vnodeop_p lm.layerm_vnodeop_p 102 1.2.6.2 bouyer #define ovm_node_hashtbl lm.layerm_node_hashtbl 103 1.2.6.2 bouyer #define ovm_node_hash lm.layerm_node_hash 104 1.2.6.2 bouyer #define ovm_hashlock lm.layerm_hashlock 105 1.2.6.2 bouyer 106 1.2.6.2 bouyer /* 107 1.2.6.2 bouyer * A cache of vnode references 108 1.2.6.2 bouyer */ 109 1.2.6.2 bouyer struct overlay_node { 110 1.2.6.2 bouyer struct layer_node ln; 111 1.2.6.2 bouyer }; 112 1.2.6.2 bouyer #define ov_hash ln.layer_hash 113 1.2.6.2 bouyer #define ov_lowervp ln.layer_lowervp 114 1.2.6.2 bouyer #define ov_vnode ln.layer_vnode 115 1.2.6.2 bouyer #define ov_flags ln.layer_flags 116 1.2.6.2 bouyer 117 1.2.6.2 bouyer #define MOUNTTOOVERLAYMOUNT(mp) ((struct overlay_mount *)((mp)->mnt_data)) 118 1.2.6.2 bouyer #define VTOOVERLAY(vp) ((struct overlay_node *)(vp)->v_data) 119 1.2.6.2 bouyer #define OVERLAYTOV(xp) ((xp)->ov_vnode) 120 1.2.6.2 bouyer #ifdef OVERLAYFS_DIAGNOSTIC 121 1.2.6.2 bouyer extern struct vnode *layer_checkvp __P((struct vnode *vp, char *fil, int lno)); 122 1.2.6.2 bouyer #define OVERLAYVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__) 123 1.2.6.2 bouyer #else 124 1.2.6.2 bouyer #define OVERLAYVPTOLOWERVP(vp) (VTOOVERLAY(vp)->ov_lowervp) 125 1.2.6.2 bouyer #endif 126 1.2.6.2 bouyer 127 1.2.6.2 bouyer extern int (**overlay_vnodeop_p) __P((void *)); 128 1.2.6.2 bouyer extern struct vfsops overlay_vfsops; 129 1.2.6.2 bouyer 130 1.2.6.2 bouyer #endif /* _KERNEL */ 131
Indexes created Sun Nov 02 07:10:05 GMT 2025