/*
- * 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 */
/*
*
* @(#)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__ */
projects / apple / xnu.git / blobdiff