Source to miscfs/lofs/lofs.h


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/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 * 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.
 *
 *	@(#)lofs.h	8.1 (Berkeley) 6/10/93
 *
 * $Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp jsp $
 */

struct lofs_args {
	char		*target;	/* Target of loopback  */
};

struct lofsmount {
	struct mount	*looped_vfs;
	struct vnode	*rootvp;	/* Reference to root lofsnode */
};

#ifdef KERNEL
/*
 * A cache of vnode references
 */
struct lofsnode {
	struct lofsnode	*a_forw;	/* Hash chain */
	struct lofsnode	*a_back;
	struct vnode	*a_lofsvp;	/* Aliased vnode - VREFed once */
	struct vnode	*a_vnode;	/* Back pointer to vnode/lofsnode */
};

extern int make_lofs __P((struct mount *mp, struct vnode **vpp));

#define	VFSTOLOFS(mp) ((struct lofsmount *)((mp)->mnt_data))
#define	LOFSP(vp) ((struct lofsnode *)(vp)->v_data)
#ifdef LOFS_DIAGNOSTIC
extern struct vnode *lofs_checkvp __P((struct vnode *vp, char *fil, int lno));
#define	LOFSVP(vp) lofs_checkvp(vp, __FILE__, __LINE__)
#else
#define	LOFSVP(vp) (LOFSP(vp)->a_lofsvp)
#endif

extern int (**lofs_vnodeop_p)();
extern struct vfsops lofs_vfsops;
#endif /* KERNEL */