1 /* $NetBSD: null.h,v 1.13 2001/11/07 04:56:09 enami 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. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * from: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp 72 * @(#)null.h 8.2 (Berkeley) 1/21/94 73 */ 74 75 #include <miscfs/genfs/layer.h> 76 77 struct null_args { 78 struct layer_args la; /* generic layerfs args */ 79 }; 80 #define nulla_target la.target 81 #define nulla_export la.export 82 83 #ifdef _KERNEL 84 struct null_mount { 85 struct layer_mount lm; /* generic layerfs mount stuff */ 86 }; 87 #define nullm_vfs lm.layerm_vfs 88 #define nullm_rootvp lm.layerm_rootvp 89 #define nullm_export lm.layerm_export 90 #define nullm_flags lm.layerm_flags 91 #define nullm_size lm.layerm_size 92 #define nullm_tag lm.layerm_tag 93 #define nullm_bypass lm.layerm_bypass 94 #define nullm_alloc lm.layerm_alloc 95 #define nullm_vnodeop_p lm.layerm_vnodeop_p 96 #define nullm_node_hashtbl lm.layerm_node_hashtbl 97 #define nullm_node_hash lm.layerm_node_hash 98 #define nullm_hashlock lm.layerm_hashlock 99 100 /* 101 * A cache of vnode references 102 */ 103 struct null_node { 104 struct layer_node ln; 105 }; 106 #define null_hash ln.layer_hash 107 #define null_lowervp ln.layer_lowervp 108 #define null_vnode ln.layer_vnode 109 #define null_flags ln.layer_flags 110 111 int null_node_create __P((struct mount *, struct vnode *, 112 struct vnode **)); 113 114 #define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data)) 115 #define VTONULL(vp) ((struct null_node *)(vp)->v_data) 116 #define NULLTOV(xp) ((xp)->null_vnode) 117 #ifdef NULLFS_DIAGNOSTIC 118 struct vnode *layer_checkvp __P((struct vnode *, char *, int)); 119 #define NULLVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__) 120 #else 121 #define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp) 122 #endif 123 124 extern int (**null_vnodeop_p) __P((void *)); 125 extern struct vfsops nullfs_vfsops; 126 127 void nullfs_init __P((void)); 128 129 #endif /* _KERNEL */ 130