[apple/xnu.git] / bsd / miscfs / nullfs / null.h

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_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_LICENSE_OSREFERENCE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  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.
 *
 *	@(#)null.h	8.3 (Berkeley) 8/20/94
 *
 *	null.h	8.2 (Berkeley) 1/21/94
 */
#ifdef __NULLFS_NULL_H__
#define __NULLFS_NULL_H__

#include  <sys/appleapiopts.h>

#ifdef __APPLE_API_PRIVATE
struct null_args {
	char		*target;	/* Target of loopback  */
};

struct null_mount {
	struct mount	*nullm_vfs;
	struct vnode	*nullm_rootvp;	/* Reference to root null_node */
};

#ifdef KERNEL
/* LP64 version of null_args.  all pointers 
 * grow when we're dealing with a 64-bit process.
 * WARNING - keep in sync with null_args
 */
/* LP64todo - should this move? */
struct user_null_args {
	user_addr_t		target;	/* Target of loopback  */
};

/*
 * A cache of vnode references
 */
struct null_node {
	LIST_ENTRY(null_node)	null_hash;	/* Hash list */
	struct vnode	        *null_lowervp;	/* VREFed once */
	struct vnode		*null_vnode;	/* Back pointer */
};

extern int null_node_create(struct mount *mp, struct vnode *target, struct vnode **vpp);

#define	MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
#define	VTONULL(vp) ((struct null_node *)(vp)->v_data)
#define	NULLTOV(xp) ((xp)->null_vnode)
#ifdef NULLFS_DIAGNOSTIC
extern struct vnode *null_checkvp(struct vnode *vp, char *fil, int lno);
#define	NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
#else
#define	NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
#endif

extern int (**null_vnodeop_p)(void *);
extern struct vfsops null_vfsops;
#endif /* KERNEL */

#endif /* __APPLE_API_PRIVATE */
#endif /* __NULLFS_NULL_H__ */
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8ad349bb	4	* @APPLE_LICENSE_OSREFERENCE_HEADER_START@
1c79356b	5	*
8ad349bb 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
	10	* License may not be used to create, or enable the creation or
	11	* redistribution of, unlawful or unlicensed copies of an Apple operating
	12	* system, or to circumvent, violate, or enable the circumvention or
	13	* violation of, any terms of an Apple operating system software license
	14	* agreement.
	15	*
	16	* Please obtain a copy of the License at
	17	* http://www.opensource.apple.com/apsl/ and read it before using this
	18	* file.
	19	*
	20	* The Original Code and all software distributed under the License are
	21	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	22	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	23	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	24	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	25	* Please see the License for the specific language governing rights and
	26	* limitations under the License.
	27	*
	28	* @APPLE_LICENSE_OSREFERENCE_HEADER_END@
1c79356b A	29	*/
	30	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	31	/*
	32	* Copyright (c) 1992, 1993
	33	* The Regents of the University of California. All rights reserved.
	34	*
	35	* This code is derived from software donated to Berkeley by
	36	* Jan-Simon Pendry.
	37	*
	38	* Redistribution and use in source and binary forms, with or without
	39	* modification, are permitted provided that the following conditions
	40	* are met:
	41	* 1. Redistributions of source code must retain the above copyright
	42	* notice, this list of conditions and the following disclaimer.
	43	* 2. Redistributions in binary form must reproduce the above copyright
	44	* notice, this list of conditions and the following disclaimer in the
	45	* documentation and/or other materials provided with the distribution.
	46	* 3. All advertising materials mentioning features or use of this software
	47	* must display the following acknowledgement:
	48	* This product includes software developed by the University of
	49	* California, Berkeley and its contributors.
	50	* 4. Neither the name of the University nor the names of its contributors
	51	* may be used to endorse or promote products derived from this software
	52	* without specific prior written permission.
	53	*
	54	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	55	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	56	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	57	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	58	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	59	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	60	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	61	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	62	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	63	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	64	* SUCH DAMAGE.
	65	*
	66	* @(#)null.h 8.3 (Berkeley) 8/20/94
	67	*
	68	* null.h 8.2 (Berkeley) 1/21/94
	69	*/
9bccf70c A	70	#ifdef __NULLFS_NULL_H__
9bccf70c A	71	#define __NULLFS_NULL_H__
1c79356b	72
9bccf70c A	73	#include <sys/appleapiopts.h>
	74
	75	#ifdef __APPLE_API_PRIVATE
1c79356b A	76	struct null_args {
	77	char target; / Target of loopback */
	78	};
	79
	80	struct null_mount {
	81	struct mount *nullm_vfs;
	82	struct vnode nullm_rootvp; / Reference to root null_node */
	83	};
	84
	85	#ifdef KERNEL
91447636 A	86	/* LP64 version of null_args. all pointers
	87	* grow when we're dealing with a 64-bit process.
	88	* WARNING - keep in sync with null_args
	89	*/
	90	/* LP64todo - should this move? */
	91	struct user_null_args {
	92	user_addr_t target; /* Target of loopback */
	93	};
	94
1c79356b A	95	/*
	96	* A cache of vnode references
	97	*/
	98	struct null_node {
	99	LIST_ENTRY(null_node) null_hash; /* Hash list */
	100	struct vnode null_lowervp; / VREFed once */
	101	struct vnode null_vnode; / Back pointer */
	102	};
	103
91447636	104	extern int null_node_create(struct mount mp, struct vnode target, struct vnode **vpp);
1c79356b A	105
	106	#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
	107	#define VTONULL(vp) ((struct null_node *)(vp)->v_data)
	108	#define NULLTOV(xp) ((xp)->null_vnode)
	109	#ifdef NULLFS_DIAGNOSTIC
91447636	110	extern struct vnode null_checkvp(struct vnode vp, char *fil, int lno);
1c79356b A	111	#define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
	112	#else
	113	#define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
	114	#endif
	115
	116	extern int (*null_vnodeop_p)(void );
	117	extern struct vfsops null_vfsops;
	118	#endif /* KERNEL */
9bccf70c A	119
	120	#endif /* __APPLE_API_PRIVATE */
	121	#endif /* __NULLFS_NULL_H__ */