[apple/xnu.git] / bsd / miscfs / union / union.h

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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, QUIET ENJOYMENT 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__ */
Commit	Line	Data
1c79356b	1	/*
9bccf70c	2	* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	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	*/
9bccf70c A	64	#ifndef __UNION_UNION_H__
9bccf70c A	65	#define __UNION_UNION_H__
1c79356b	66
9bccf70c A	67	#include <sys/appleapiopts.h>
	68
	69	#ifdef __APPLE_API_PRIVATE
1c79356b A	70	struct union_args {
	71	char target; / Target of loopback */
	72	int mntflags; /* Options on the mount */
	73	};
	74
	75	#define UNMNT_ABOVE 0x0001 /* Target appears below mount point */
	76	#define UNMNT_BELOW 0x0002 /* Target appears below mount point */
	77	#define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
	78	#define UNMNT_OPMASK 0x0003
	79
	80	struct union_mount {
	81	struct vnode *um_uppervp;
	82	struct vnode *um_lowervp;
	83	struct ucred um_cred; / Credentials of user calling mount */
	84	int um_cmode; /* cmask from mount process */
	85	int um_op; /* Operation mode */
	86	};
	87
	88	#ifdef KERNEL
	89
	90	/*
	91	* DEFDIRMODE is the mode bits used to create a shadow directory.
	92	*/
	93	#define VRWXMODE (VREAD\|VWRITE\|VEXEC)
	94	#define VRWMODE (VREAD\|VWRITE)
	95	#define UN_DIRMODE ((VRWXMODE)\|(VRWXMODE>>3)\|(VRWXMODE>>6))
	96	#define UN_FILEMODE ((VRWMODE)\|(VRWMODE>>3)\|(VRWMODE>>6))
	97
	98	/*
	99	* A cache of vnode references
	100	*/
	101	struct union_node {
	102	LIST_ENTRY(union_node) un_cache; /* Hash chain */
	103	struct vnode un_vnode; / Back pointer */
	104	struct vnode un_uppervp; / overlaying object */
	105	struct vnode un_lowervp; / underlying object */
	106	struct vnode un_dirvp; / Parent dir of uppervp */
	107	struct vnode un_pvp; / Parent vnode */
	108	char un_path; / saved component name */
	109	int un_hash; /* saved un_path hash value */
	110	int un_openl; /* # of opens on lowervp */
	111	unsigned int un_flags;
	112	struct vnode *un_dircache; / cached union stack */
	113	off_t un_uppersz; /* size of upper object */
	114	off_t un_lowersz; /* size of lower object */
	115	#if DIAGNOSTIC
	116	pid_t un_pid;
	117	#endif
	118	};
	119
	120	#define UN_WANT 0x01
	121	#define UN_LOCKED 0x02
	122	#define UN_ULOCK 0x04 /* Upper node is locked */
	123	#define UN_KLOCK 0x08 /* Keep upper node locked on vput */
	124	#define UN_CACHED 0x10 /* In union cache */
	125
	126	extern int union_allocvp __P((struct vnode *, struct mount ,
	127	struct vnode , struct vnode ,
	128	struct componentname , struct vnode ,
	129	struct vnode *, int));
	130	extern int union_copyfile __P((struct vnode , struct vnode ,
	131	struct ucred , struct proc ));
	132	extern int union_copyup __P((struct union_node , int, struct ucred ,
	133	struct proc *));
134	extern int union_dowhiteout __P((struct union_node , struct ucred ,
135	struct proc *));
136	extern int union_mkshadow __P((struct union_mount , struct vnode ,
137	struct componentname , struct vnode *));
138	extern int union_mkwhiteout __P((struct union_mount , struct vnode ,
139	struct componentname , char ));
140	extern int union_vn_create __P((struct vnode *, struct union_node ,
141	struct proc *));
142	extern int union_cn_close __P((struct vnode , int, struct ucred ,
143	struct proc *));
144	extern void union_removed_upper __P((struct union_node *un));
145	extern struct vnode union_lowervp __P((struct vnode ));
146	extern void union_newlower __P((struct union_node , struct vnode ));
147	extern void union_newupper __P((struct union_node , struct vnode ));
148	extern void union_newsize __P((struct vnode *, off_t, off_t));
149
150	#define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
151	#define VTOUNION(vp) ((struct union_node *)(vp)->v_data)
152	#define UNIONTOV(un) ((un)->un_vnode)
153	#define LOWERVP(vp) (VTOUNION(vp)->un_lowervp)
154	#define UPPERVP(vp) (VTOUNION(vp)->un_uppervp)
155	#define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp))
156
157	extern int (*union_vnodeop_p)(void );
158	extern struct vfsops union_vfsops;
159	#endif /* KERNEL */
9bccf70c A	160
	161	#endif /* __APPLE_API_PRIVATE */
	162	#endif /* __UNION_UNION_H__ */