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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
23: /*
24: * Copyright (c) 1994 The Regents of the University of California.
25: * Copyright (c) 1994 Jan-Simon Pendry.
26: * All rights reserved.
27: *
28: * This code is derived from software donated to Berkeley by
29: * Jan-Simon Pendry.
30: *
31: * Redistribution and use in source and binary forms, with or without
32: * modification, are permitted provided that the following conditions
33: * are met:
34: * 1. Redistributions of source code must retain the above copyright
35: * notice, this list of conditions and the following disclaimer.
36: * 2. Redistributions in binary form must reproduce the above copyright
37: * notice, this list of conditions and the following disclaimer in the
38: * documentation and/or other materials provided with the distribution.
39: * 3. All advertising materials mentioning features or use of this software
40: * must display the following acknowledgement:
41: * This product includes software developed by the University of
42: * California, Berkeley and its contributors.
43: * 4. Neither the name of the University nor the names of its contributors
44: * may be used to endorse or promote products derived from this software
45: * without specific prior written permission.
46: *
47: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
48: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
51: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57: * SUCH DAMAGE.
58: *
59: * @(#)union.h 8.9 (Berkeley) 12/10/94
60: */
61:
62: struct union_args {
63: char *target; /* Target of loopback */
64: int mntflags; /* Options on the mount */
65: };
66:
67: #define UNMNT_ABOVE 0x0001 /* Target appears below mount point */
68: #define UNMNT_BELOW 0x0002 /* Target appears below mount point */
69: #define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
70: #define UNMNT_OPMASK 0x0003
71:
72: struct union_mount {
73: struct vnode *um_uppervp;
74: struct vnode *um_lowervp;
75: struct ucred *um_cred; /* Credentials of user calling mount */
76: int um_cmode; /* cmask from mount process */
77: int um_op; /* Operation mode */
78: };
79:
80: #ifdef KERNEL
81:
82: /*
83: * DEFDIRMODE is the mode bits used to create a shadow directory.
84: */
85: #define VRWXMODE (VREAD|VWRITE|VEXEC)
86: #define VRWMODE (VREAD|VWRITE)
87: #define UN_DIRMODE ((VRWXMODE)|(VRWXMODE>>3)|(VRWXMODE>>6))
88: #define UN_FILEMODE ((VRWMODE)|(VRWMODE>>3)|(VRWMODE>>6))
89:
90: /*
91: * A cache of vnode references
92: */
93: struct union_node {
94: LIST_ENTRY(union_node) un_cache; /* Hash chain */
95: struct vnode *un_vnode; /* Back pointer */
96: struct vnode *un_uppervp; /* overlaying object */
97: struct vnode *un_lowervp; /* underlying object */
98: struct vnode *un_dirvp; /* Parent dir of uppervp */
99: struct vnode *un_pvp; /* Parent vnode */
100: char *un_path; /* saved component name */
101: int un_hash; /* saved un_path hash value */
102: int un_openl; /* # of opens on lowervp */
103: unsigned int un_flags;
104: struct vnode **un_dircache; /* cached union stack */
105: off_t un_uppersz; /* size of upper object */
106: off_t un_lowersz; /* size of lower object */
107: #if DIAGNOSTIC
108: pid_t un_pid;
109: #endif
110: };
111:
112: #define UN_WANT 0x01
113: #define UN_LOCKED 0x02
114: #define UN_ULOCK 0x04 /* Upper node is locked */
115: #define UN_KLOCK 0x08 /* Keep upper node locked on vput */
116: #define UN_CACHED 0x10 /* In union cache */
117:
118: extern int union_allocvp __P((struct vnode **, struct mount *,
119: struct vnode *, struct vnode *,
120: struct componentname *, struct vnode *,
121: struct vnode *, int));
122: extern int union_copyfile __P((struct vnode *, struct vnode *,
123: struct ucred *, struct proc *));
124: extern int union_copyup __P((struct union_node *, int, struct ucred *,
125: struct proc *));
126: extern int union_dowhiteout __P((struct union_node *, struct ucred *,
127: struct proc *));
128: extern int union_mkshadow __P((struct union_mount *, struct vnode *,
129: struct componentname *, struct vnode **));
130: extern int union_mkwhiteout __P((struct union_mount *, struct vnode *,
131: struct componentname *, char *));
132: extern int union_vn_create __P((struct vnode **, struct union_node *,
133: struct proc *));
134: extern int union_cn_close __P((struct vnode *, int, struct ucred *,
135: struct proc *));
136: extern void union_removed_upper __P((struct union_node *un));
137: extern struct vnode *union_lowervp __P((struct vnode *));
138: extern void union_newlower __P((struct union_node *, struct vnode *));
139: extern void union_newupper __P((struct union_node *, struct vnode *));
140: extern void union_newsize __P((struct vnode *, off_t, off_t));
141:
142: #define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
143: #define VTOUNION(vp) ((struct union_node *)(vp)->v_data)
144: #define UNIONTOV(un) ((un)->un_vnode)
145: #define LOWERVP(vp) (VTOUNION(vp)->un_lowervp)
146: #define UPPERVP(vp) (VTOUNION(vp)->un_uppervp)
147: #define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp))
148:
149: extern int (**union_vnodeop_p)();
150: extern struct vfsops union_vfsops;
151: #endif /* KERNEL */
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