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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | /* * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* * Copyright (c) 1994 The Regents of the University of California. * Copyright (c) 1994 Jan-Simon Pendry. * All rights reserved. * * This code is derived from software donated to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)union.h 8.9 (Berkeley) 12/10/94 */ #ifndef __UNION_UNION_H__ #define __UNION_UNION_H__ #include <sys/appleapiopts.h> #ifdef __APPLE_API_PRIVATE struct union_args { char *target; /* Target of loopback */ int mntflags; /* Options on the mount */ }; #define UNMNT_ABOVE 0x0001 /* Target appears below mount point */ #define UNMNT_BELOW 0x0002 /* Target appears below mount point */ #define UNMNT_REPLACE 0x0003 /* Target replaces mount point */ #define UNMNT_OPMASK 0x0003 struct union_mount { struct vnode *um_uppervp; struct vnode *um_lowervp; struct ucred *um_cred; /* Credentials of user calling mount */ int um_cmode; /* cmask from mount process */ int um_op; /* Operation mode */ }; #ifdef KERNEL /* * DEFDIRMODE is the mode bits used to create a shadow directory. */ #define VRWXMODE (VREAD|VWRITE|VEXEC) #define VRWMODE (VREAD|VWRITE) #define UN_DIRMODE ((VRWXMODE)|(VRWXMODE>>3)|(VRWXMODE>>6)) #define UN_FILEMODE ((VRWMODE)|(VRWMODE>>3)|(VRWMODE>>6)) /* * A cache of vnode references */ struct union_node { LIST_ENTRY(union_node) un_cache; /* Hash chain */ struct vnode *un_vnode; /* Back pointer */ struct vnode *un_uppervp; /* overlaying object */ struct vnode *un_lowervp; /* underlying object */ struct vnode *un_dirvp; /* Parent dir of uppervp */ struct vnode *un_pvp; /* Parent vnode */ char *un_path; /* saved component name */ int un_hash; /* saved un_path hash value */ int un_openl; /* # of opens on lowervp */ unsigned int un_flags; struct vnode **un_dircache; /* cached union stack */ off_t un_uppersz; /* size of upper object */ off_t un_lowersz; /* size of lower object */ #if DIAGNOSTIC pid_t un_pid; #endif }; #define UN_WANT 0x01 #define UN_LOCKED 0x02 #define UN_ULOCK 0x04 /* Upper node is locked */ #define UN_KLOCK 0x08 /* Keep upper node locked on vput */ #define UN_CACHED 0x10 /* In union cache */ extern int union_allocvp __P((struct vnode **, struct mount *, struct vnode *, struct vnode *, struct componentname *, struct vnode *, struct vnode *, int)); extern int union_copyfile __P((struct vnode *, struct vnode *, struct ucred *, struct proc *)); extern int union_copyup __P((struct union_node *, int, struct ucred *, struct proc *)); extern int union_dowhiteout __P((struct union_node *, struct ucred *, struct proc *)); extern int union_mkshadow __P((struct union_mount *, struct vnode *, struct componentname *, struct vnode **)); extern int union_mkwhiteout __P((struct union_mount *, struct vnode *, struct componentname *, char *)); extern int union_vn_create __P((struct vnode **, struct union_node *, struct proc *)); extern int union_cn_close __P((struct vnode *, int, struct ucred *, struct proc *)); extern void union_removed_upper __P((struct union_node *un)); extern struct vnode *union_lowervp __P((struct vnode *)); extern void union_newlower __P((struct union_node *, struct vnode *)); extern void union_newupper __P((struct union_node *, struct vnode *)); extern void union_newsize __P((struct vnode *, off_t, off_t)); #define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data)) #define VTOUNION(vp) ((struct union_node *)(vp)->v_data) #define UNIONTOV(un) ((un)->un_vnode) #define LOWERVP(vp) (VTOUNION(vp)->un_lowervp) #define UPPERVP(vp) (VTOUNION(vp)->un_uppervp) #define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp)) extern int (**union_vnodeop_p)(void *); extern struct vfsops union_vfsops; #endif /* KERNEL */ #endif /* __APPLE_API_PRIVATE */ #endif /* __UNION_UNION_H__ */ |