1 | /* $NetBSD: layer.h,v 1.16 2014/05/28 10:51:20 hannken 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_GENFS_LAYER_H_ |
72 | #define _MISCFS_GENFS_LAYER_H_ |
73 | |
74 | struct layer_args { |
75 | char *target; /* Target of loopback */ |
76 | struct export_args30 _pad1; /* compat with old userland tools */ |
77 | }; |
78 | |
79 | #ifdef _KERNEL |
80 | |
81 | struct layer_mount { |
82 | struct mount *layerm_vfs; |
83 | struct vnode *layerm_rootvp; /* Ref to root layer_node */ |
84 | u_int layerm_flags; /* mount point layer flags */ |
85 | u_int layerm_size; /* size of fs's struct node */ |
86 | enum vtagtype layerm_tag; /* vtag of our vnodes */ |
87 | int /* bypass routine for this mount */ |
88 | (*layerm_bypass)(void *); |
89 | int (**layerm_vnodeop_p) /* ops for our nodes */ |
90 | (void *); |
91 | }; |
92 | |
93 | #define LAYERFS_MFLAGS 0x00000fff /* reserved layer mount flags */ |
94 | #define LAYERFS_MBYPASSDEBUG 0x00000001 |
95 | |
96 | /* |
97 | * A cache of vnode references |
98 | */ |
99 | struct layer_node { |
100 | struct vnode *layer_lowervp; /* VREFed once */ |
101 | struct vnode *layer_vnode; /* Back pointer */ |
102 | unsigned int layer_flags; /* locking, etc. */ |
103 | }; |
104 | |
105 | #define LAYERFS_RESFLAGS 0x00000fff /* flags reserved for layerfs */ |
106 | #define LAYERFS_REMOVED 0x00000001 /* Did a remove on this node */ |
107 | |
108 | #define LAYERFS_DO_BYPASS(vp, ap) \ |
109 | (*MOUNTTOLAYERMOUNT((vp)->v_mount)->layerm_bypass)((ap)) |
110 | |
111 | struct vnode *layer_checkvp(struct vnode *vp, const char *fil, int lno); |
112 | |
113 | #define MOUNTTOLAYERMOUNT(mp) ((struct layer_mount *)((mp)->mnt_data)) |
114 | #define VTOLAYER(vp) ((struct layer_node *)(vp)->v_data) |
115 | #define LAYERTOV(xp) ((xp)->layer_vnode) |
116 | #ifdef LAYERFS_DIAGNOSTIC |
117 | #define LAYERVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__) |
118 | extern int layerfs_debug; |
119 | #else |
120 | #define LAYERVPTOLOWERVP(vp) (VTOLAYER(vp)->layer_lowervp) |
121 | #endif |
122 | |
123 | #endif /* _KERNEL */ |
124 | #endif /* _MISCFS_GENFS_LAYER_H_ */ |
125 | |