X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/1c79356b52d46aa6b508fb032f5ae709b1f2897b..3903760236c30e3b5ace7a4eefac3a269d68957c:/bsd/miscfs/union/union.h diff --git a/bsd/miscfs/union/union.h b/bsd/miscfs/union/union.h index 9181e8d51..eee3e5a87 100644 --- a/bsd/miscfs/union/union.h +++ b/bsd/miscfs/union/union.h @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_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 file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The 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. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* @@ -58,94 +64,8 @@ * * @(#)union.h 8.9 (Berkeley) 12/10/94 */ +#ifndef __UNION_UNION_H__ +#define __UNION_UNION_H__ -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 /* __UNION_UNION_H__ */