1/*	$NetBSD: mfsnode.h,v 1.22 2021/07/18 23:57:15 dholland Exp $	*/
 2
 3/*
 4 * Copyright (c) 1989, 1993
 5 *	The Regents of the University of California.  All rights reserved.
 6 *
 7 * Redistribution and use in source and binary forms, with or without
 8 * modification, are permitted provided that the following conditions
 9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	@(#)mfsnode.h	8.3 (Berkeley) 5/19/95
32 */
33
34#ifndef _UFS_MFS_MFSNODE_H_
35#define _UFS_MFS_MFSNODE_H_
36
37/*
38 * This structure defines the control data for the memory based file system.
39 */
40
41struct mfsnode {
42	struct vnode *mfs_vnode;	/* vnode associated with this mfsnode */
43	void 	*mfs_baseoff;		/* base of file system in memory */
44	long	mfs_size;		/* size of memory file system */
45	struct proc *mfs_proc;		/* supporting process */
46	int	mfs_shutdown;		/* shutdown this mfsnode */
47#if defined(_KERNEL)
48	kcondvar_t mfs_cv;		/* notifier */
49	int	mfs_refcnt;		/* number of references */
50	struct	bufq_state *mfs_buflist;/* list of I/O requests */
51#endif /* defined(_KERNEL) */
52};
53
54#if defined(_KERNEL)
55/*
56 * Convert between mfsnode pointers and vnode pointers
57 */
58#define VTOMFS(vp)	((struct mfsnode *)(vp)->v_data)
59#define MFSTOV(mfsp)	((mfsp)->mfs_vnode)
60
61#endif /* defined(_KERNEL) */
62
63#endif /* !_UFS_MFS_MFSNODE_H_ */