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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1994 The Regents of the University of California.
28: * Copyright (c) 1994 Jan-Simon Pendry.
29: * All rights reserved.
30: *
31: * This code is derived from software donated to Berkeley by
32: * Jan-Simon Pendry.
33: *
34: * Redistribution and use in source and binary forms, with or without
35: * modification, are permitted provided that the following conditions
36: * are met:
37: * 1. Redistributions of source code must retain the above copyright
38: * notice, this list of conditions and the following disclaimer.
39: * 2. Redistributions in binary form must reproduce the above copyright
40: * notice, this list of conditions and the following disclaimer in the
41: * documentation and/or other materials provided with the distribution.
42: * 3. All advertising materials mentioning features or use of this software
43: * must display the following acknowledgement:
44: * This product includes software developed by the University of
45: * California, Berkeley and its contributors.
46: * 4. Neither the name of the University nor the names of its contributors
47: * may be used to endorse or promote products derived from this software
48: * without specific prior written permission.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60: * SUCH DAMAGE.
61: *
62: * @(#)union.h 8.9 (Berkeley) 12/10/94
63: */
64:
65: struct union_args {
66: char *target; /* Target of loopback */
67: int mntflags; /* Options on the mount */
68: };
69:
70: #define UNMNT_ABOVE 0x0001 /* Target appears below mount point */
71: #define UNMNT_BELOW 0x0002 /* Target appears below mount point */
72: #define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
73: #define UNMNT_OPMASK 0x0003
74:
75: struct union_mount {
76: struct vnode *um_uppervp;
77: struct vnode *um_lowervp;
78: struct ucred *um_cred; /* Credentials of user calling mount */
79: int um_cmode; /* cmask from mount process */
80: int um_op; /* Operation mode */
81: };
82:
83: #ifdef _KERNEL
84:
85: /*
86: * DEFDIRMODE is the mode bits used to create a shadow directory.
87: */
88: #define VRWXMODE (VREAD|VWRITE|VEXEC)
89: #define VRWMODE (VREAD|VWRITE)
90: #define UN_DIRMODE ((VRWXMODE)|(VRWXMODE>>3)|(VRWXMODE>>6))
91: #define UN_FILEMODE ((VRWMODE)|(VRWMODE>>3)|(VRWMODE>>6))
92:
93: /*
94: * A cache of vnode references
95: */
96: struct union_node {
97: LIST_ENTRY(union_node) un_cache; /* Hash chain */
98: struct vnode *un_vnode; /* Back pointer */
99: struct vnode *un_uppervp; /* overlaying object */
100: struct vnode *un_lowervp; /* underlying object */
101: struct vnode *un_dirvp; /* Parent dir of uppervp */
102: struct vnode *un_pvp; /* Parent vnode */
103: char *un_path; /* saved component name */
104: int un_hash; /* saved un_path hash value */
105: int un_openl; /* # of opens on lowervp */
106: unsigned int un_flags;
107: struct vnode **un_dircache; /* cached union stack */
108: off_t un_uppersz; /* size of upper object */
109: off_t un_lowersz; /* size of lower object */
110: #if 1 /* was ifdef DIAGNOSTIC */
111: pid_t un_pid;
112: #endif
113: };
114:
115: #define UN_WANT 0x01
116: #define UN_LOCKED 0x02
117: #define UN_ULOCK 0x04 /* Upper node is locked */
118: #define UN_KLOCK 0x08 /* Keep upper node locked on vput */
119: #define UN_CACHED 0x10 /* In union cache */
120:
121: extern int union_allocvp __P((struct vnode **, struct mount *,
122: struct vnode *, struct vnode *,
123: struct componentname *, struct vnode *,
124: struct vnode *, int));
125: extern int union_copyfile __P((struct vnode *, struct vnode *,
126: struct ucred *, struct proc *));
127: extern int union_copyup __P((struct union_node *, int, struct ucred *,
128: struct proc *));
129: extern int union_dowhiteout __P((struct union_node *, struct ucred *,
130: struct proc *));
131: extern int union_mkshadow __P((struct union_mount *, struct vnode *,
132: struct componentname *, struct vnode **));
133: extern int union_mkwhiteout __P((struct union_mount *, struct vnode *,
134: struct componentname *, char *));
135: extern int union_vn_create __P((struct vnode **, struct union_node *,
136: struct proc *));
137: extern int union_cn_close __P((struct vnode *, int, struct ucred *,
138: struct proc *));
139: extern void union_removed_upper __P((struct union_node *un));
140: extern struct vnode *union_lowervp __P((struct vnode *));
141: extern void union_newlower __P((struct union_node *, struct vnode *));
142: extern void union_newupper __P((struct union_node *, struct vnode *));
143: extern void union_newsize __P((struct vnode *, off_t, off_t));
144:
145: #define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
146: #define VTOUNION(vp) ((struct union_node *)(vp)->v_data)
147: #define UNIONTOV(un) ((un)->un_vnode)
148: #define LOWERVP(vp) (VTOUNION(vp)->un_lowervp)
149: #define UPPERVP(vp) (VTOUNION(vp)->un_uppervp)
150: #define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp))
151:
152: extern int (**union_vnodeop_p)();
153: extern struct vfsops union_vfsops;
154: #endif /* _KERNEL */
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