| 1 | /* $NetBSD: null.h,v 1.19 2010/07/02 03:16:01 rmind 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. Neither the name of the University nor the names of its contributors |
| 52 | * may be used to endorse or promote products derived from this software |
| 53 | * without specific prior written permission. |
| 54 | * |
| 55 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 56 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 57 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 58 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 59 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 60 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 61 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 62 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 63 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 64 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 65 | * SUCH DAMAGE. |
| 66 | * |
| 67 | * from: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp |
| 68 | * @(#)null.h 8.2 (Berkeley) 1/21/94 |
| 69 | */ |
| 70 | |
| 71 | #ifndef _MISCFS_NULLFS_H_ |
| 72 | #define _MISCFS_NULLFS_H_ |
| 73 | |
| 74 | #include <miscfs/genfs/layer.h> |
| 75 | |
| 76 | struct null_args { |
| 77 | struct layer_args la; /* generic layerfs args */ |
| 78 | }; |
| 79 | #define nulla_target la.target |
| 80 | #define nulla_export la.export |
| 81 | |
| 82 | #ifdef _KERNEL |
| 83 | struct null_mount { |
| 84 | struct layer_mount lm; /* generic layerfs mount stuff */ |
| 85 | }; |
| 86 | #define nullm_vfs lm.layerm_vfs |
| 87 | #define nullm_rootvp lm.layerm_rootvp |
| 88 | #define nullm_export lm.layerm_export |
| 89 | #define nullm_flags lm.layerm_flags |
| 90 | #define nullm_size lm.layerm_size |
| 91 | #define nullm_tag lm.layerm_tag |
| 92 | #define nullm_bypass lm.layerm_bypass |
| 93 | #define nullm_alloc lm.layerm_alloc |
| 94 | #define nullm_vnodeop_p lm.layerm_vnodeop_p |
| 95 | #define nullm_node_hashtbl lm.layerm_node_hashtbl |
| 96 | #define nullm_node_hash lm.layerm_node_hash |
| 97 | #define nullm_hashlock lm.layerm_hashlock |
| 98 | |
| 99 | /* |
| 100 | * A cache of vnode references |
| 101 | */ |
| 102 | struct null_node { |
| 103 | struct layer_node ln; |
| 104 | }; |
| 105 | #define null_hash ln.layer_hash |
| 106 | #define null_lowervp ln.layer_lowervp |
| 107 | #define null_vnode ln.layer_vnode |
| 108 | #define null_flags ln.layer_flags |
| 109 | |
| 110 | #define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data)) |
| 111 | |
| 112 | extern int (**null_vnodeop_p)(void *); |
| 113 | extern struct vfsops nullfs_vfsops; |
| 114 | |
| 115 | void nullfs_init(void); |
| 116 | |
| 117 | #endif /* _KERNEL */ |
| 118 | #endif /* _MISCFS_NULLFS_H_ */ |
| 119 | |