1/* $OpenBSD: mfsnode.h,v 1.15 2016/11/07 00:26:33 guenther Exp $ */
2/* $NetBSD: mfsnode.h,v 1.3 1996/02/09 22:31:31 christos Exp $ */
3
4/*
5 * Copyright (c) 1989, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)mfsnode.h 8.2 (Berkeley) 8/11/93
33 */
34
35/*
36 * This structure defines the control data for the memory based file system.
37 */
38
39struct mfsnode {
40 struct vnode *mfs_vnode; /* vnode associated with this mfsnode */
41 struct bufq mfs_bufq; /* bufq for MFS I/O */
42 caddr_t mfs_baseoff; /* base of file system in memory */
43 long mfs_size; /* size of memory file system */
44 pid_t mfs_tid; /* supporting thread's tid */
45 struct buf *mfs_buflist; /* list of I/O requests */
46 int mfs_shutdown; /* shutdown request */
47};
48
49/*
50 * Convert between mfsnode pointers and vnode pointers
51 */
52#define VTOMFS(vp) ((struct mfsnode *)(vp)->v_data)
53#define MFSTOV(mfsp) ((mfsp)->mfs_vnode)