1994-05-24 10:09:53 +00:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*
|
1997-02-10 02:22:35 +00:00
|
|
|
* @(#)null.h 8.3 (Berkeley) 8/20/94
|
1994-05-24 10:09:53 +00:00
|
|
|
*
|
1999-08-28 01:08:13 +00:00
|
|
|
* $FreeBSD$
|
1994-05-24 10:09:53 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
struct null_args {
|
|
|
|
char *target; /* Target of loopback */
|
|
|
|
};
|
|
|
|
|
|
|
|
struct null_mount {
|
|
|
|
struct mount *nullm_vfs;
|
|
|
|
struct vnode *nullm_rootvp; /* Reference to root null_node */
|
|
|
|
};
|
|
|
|
|
1999-12-29 05:07:58 +00:00
|
|
|
#ifdef _KERNEL
|
1994-05-24 10:09:53 +00:00
|
|
|
/*
|
|
|
|
* A cache of vnode references
|
|
|
|
*/
|
|
|
|
struct null_node {
|
2000-05-23 20:41:01 +00:00
|
|
|
LIST_ENTRY(struct null_node) null_hash; /* Hash list */
|
1994-05-24 10:09:53 +00:00
|
|
|
struct vnode *null_lowervp; /* VREFed once */
|
|
|
|
struct vnode *null_vnode; /* Back pointer */
|
|
|
|
};
|
|
|
|
|
1997-02-12 14:55:01 +00:00
|
|
|
extern int nullfs_init __P((struct vfsconf *vfsp));
|
1994-05-24 10:09:53 +00:00
|
|
|
extern int null_node_create __P((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)
|
1999-09-04 12:35:09 +00:00
|
|
|
#ifdef DIAGNOSTIC
|
1994-05-24 10:09:53 +00:00
|
|
|
extern struct vnode *null_checkvp __P((struct vnode *vp, char *fil, int lno));
|
|
|
|
#define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
|
|
|
|
#else
|
|
|
|
#define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
|
|
|
|
#endif
|
|
|
|
|
1997-05-25 04:50:02 +00:00
|
|
|
extern int null_bypass __P((struct vop_generic_args *ap));
|
|
|
|
|
1995-11-09 08:17:23 +00:00
|
|
|
extern vop_t **null_vnodeop_p;
|
1999-12-29 05:07:58 +00:00
|
|
|
#endif /* _KERNEL */
|