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

/*
 * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * 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.
 * 
 * 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_OSREFERENCE_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>
#include  <sys/cdefs.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
/* LP64 version of union_args.  all pointers 
 * grow when we're dealing with a 64-bit process.
 * WARNING - keep in sync with union_args
 */
/* LP64todo - should this move? */

struct user_union_args {
	user_addr_t	target;		/* Target of loopback  */
	int			mntflags;	/* Options on the mount */
	char		_pad[4];
};

/*
 * 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(struct vnode **, struct mount *,
				struct vnode *, struct vnode *,
				struct componentname *, struct vnode *,
				struct vnode *, int);
extern int union_copyfile(struct vnode *, struct vnode *,
					struct ucred *, struct proc *);
extern int union_copyup(struct union_node *, int, struct ucred *,
				struct proc *);
extern int union_dowhiteout(struct union_node *, vfs_context_t);
extern int union_mkshadow(struct union_mount *, struct vnode *,
				struct componentname *, struct vnode **);
extern int union_mkwhiteout(struct union_mount *, struct vnode *,
				struct componentname *, char *);
extern int union_vn_create(struct vnode **, struct union_node *, struct proc *);
extern int union_cn_close(struct vnode *, int, struct ucred *, struct proc *);
extern void union_removed_upper(struct union_node *un);
extern struct vnode *union_lowervp(struct vnode *);
extern void union_newlower(struct union_node *, struct vnode *);
extern void union_newupper(struct union_node *, struct vnode *);
extern void union_newsize(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	/*
5d5c5d0d A	2	* Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	29	/*
	30	* Copyright (c) 1994 The Regents of the University of California.
	31	* Copyright (c) 1994 Jan-Simon Pendry.
	32	* All rights reserved.
	33	*
	34	* This code is derived from software donated to Berkeley by
	35	* Jan-Simon Pendry.
	36	*
	37	* Redistribution and use in source and binary forms, with or without
	38	* modification, are permitted provided that the following conditions
	39	* are met:
	40	* 1. Redistributions of source code must retain the above copyright
	41	* notice, this list of conditions and the following disclaimer.
	42	* 2. Redistributions in binary form must reproduce the above copyright
	43	* notice, this list of conditions and the following disclaimer in the
	44	* documentation and/or other materials provided with the distribution.
	45	* 3. All advertising materials mentioning features or use of this software
	46	* must display the following acknowledgement:
	47	* This product includes software developed by the University of
	48	* California, Berkeley and its contributors.
	49	* 4. Neither the name of the University nor the names of its contributors
	50	* may be used to endorse or promote products derived from this software
	51	* without specific prior written permission.
	52	*
	53	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	54	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	55	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	56	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	57	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	58	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	59	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	60	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	61	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	62	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	63	* SUCH DAMAGE.
	64	*
	65	* @(#)union.h 8.9 (Berkeley) 12/10/94
	66	*/
9bccf70c A	67	#ifndef __UNION_UNION_H__
9bccf70c A	68	#define __UNION_UNION_H__
1c79356b	69
9bccf70c	70	#include <sys/appleapiopts.h>
91447636	71	#include <sys/cdefs.h>
9bccf70c A	72
9bccf70c A	73	#ifdef __APPLE_API_PRIVATE
1c79356b A	74	struct union_args {
	75	char target; / Target of loopback */
	76	int mntflags; /* Options on the mount */
	77	};
	78
	79	#define UNMNT_ABOVE 0x0001 /* Target appears below mount point */
	80	#define UNMNT_BELOW 0x0002 /* Target appears below mount point */
	81	#define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
	82	#define UNMNT_OPMASK 0x0003
	83
	84	struct union_mount {
	85	struct vnode *um_uppervp;
	86	struct vnode *um_lowervp;
	87	struct ucred um_cred; / Credentials of user calling mount */
	88	int um_cmode; /* cmask from mount process */
	89	int um_op; /* Operation mode */
	90	};
	91
	92	#ifdef KERNEL
91447636 A	93	/* LP64 version of union_args. all pointers
	94	* grow when we're dealing with a 64-bit process.
	95	* WARNING - keep in sync with union_args
	96	*/
	97	/* LP64todo - should this move? */
	98
91447636 A	99	struct user_union_args {
	100	user_addr_t target; /* Target of loopback */
	101	int mntflags; /* Options on the mount */
89b3af67	102	char _pad[4];
91447636 A	103	};
91447636 A	104
1c79356b A	105	/*
	106	* DEFDIRMODE is the mode bits used to create a shadow directory.
	107	*/
	108	#define VRWXMODE (VREAD\|VWRITE\|VEXEC)
	109	#define VRWMODE (VREAD\|VWRITE)
	110	#define UN_DIRMODE ((VRWXMODE)\|(VRWXMODE>>3)\|(VRWXMODE>>6))
	111	#define UN_FILEMODE ((VRWMODE)\|(VRWMODE>>3)\|(VRWMODE>>6))
	112
	113	/*
	114	* A cache of vnode references
	115	*/
	116	struct union_node {
	117	LIST_ENTRY(union_node) un_cache; /* Hash chain */
	118	struct vnode un_vnode; / Back pointer */
	119	struct vnode un_uppervp; / overlaying object */
	120	struct vnode un_lowervp; / underlying object */
	121	struct vnode un_dirvp; / Parent dir of uppervp */
	122	struct vnode un_pvp; / Parent vnode */
	123	char un_path; / saved component name */
	124	int un_hash; /* saved un_path hash value */
	125	int un_openl; /* # of opens on lowervp */
	126	unsigned int un_flags;
	127	struct vnode *un_dircache; / cached union stack */
	128	off_t un_uppersz; /* size of upper object */
	129	off_t un_lowersz; /* size of lower object */
	130	#if DIAGNOSTIC
	131	pid_t un_pid;
	132	#endif
	133	};
	134
	135	#define UN_WANT 0x01
	136	#define UN_LOCKED 0x02
	137	#define UN_ULOCK 0x04 /* Upper node is locked */
	138	#define UN_KLOCK 0x08 /* Keep upper node locked on vput */
	139	#define UN_CACHED 0x10 /* In union cache */
	140
91447636	141	extern int union_allocvp(struct vnode *, struct mount ,
1c79356b A	142	struct vnode , struct vnode ,
1c79356b A	143	struct componentname , struct vnode ,
91447636 A	144	struct vnode *, int);
	145	extern int union_copyfile(struct vnode , struct vnode ,
	146	struct ucred , struct proc );
	147	extern int union_copyup(struct union_node , int, struct ucred ,
	148	struct proc *);
	149	extern int union_dowhiteout(struct union_node *, vfs_context_t);
	150	extern int union_mkshadow(struct union_mount , struct vnode ,
	151	struct componentname , struct vnode *);
	152	extern int union_mkwhiteout(struct union_mount , struct vnode ,
	153	struct componentname , char );
	154	extern int union_vn_create(struct vnode *, struct union_node , struct proc *);
	155	extern int union_cn_close(struct vnode , int, struct ucred , struct proc *);
	156	extern void union_removed_upper(struct union_node *un);
	157	extern struct vnode union_lowervp(struct vnode );
	158	extern void union_newlower(struct union_node , struct vnode );
	159	extern void union_newupper(struct union_node , struct vnode );
	160	extern void union_newsize(struct vnode *, off_t, off_t);
1c79356b A	161
	162	#define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
	163	#define VTOUNION(vp) ((struct union_node *)(vp)->v_data)
	164	#define UNIONTOV(un) ((un)->un_vnode)
	165	#define LOWERVP(vp) (VTOUNION(vp)->un_lowervp)
	166	#define UPPERVP(vp) (VTOUNION(vp)->un_uppervp)
	167	#define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp))
	168
	169	extern int (*union_vnodeop_p)(void );
	170	extern struct vfsops union_vfsops;
	171	#endif /* KERNEL */
9bccf70c A	172
	173	#endif /* __APPLE_API_PRIVATE */
	174	#endif /* __UNION_UNION_H__ */