/*      $OpenBSD: mfsnode.h,v 1.15 2016/11/07 00:26:33 guenther Exp $   */
/*      $NetBSD: mfsnode.h,v 1.3 1996/02/09 22:31:31 christos Exp $     */

/*
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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. 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.
 *
 *      @(#)mfsnode.h   8.2 (Berkeley) 8/11/93
 */

/*
 * This structure defines the control data for the memory based file system.
 */

struct mfsnode {
        struct vnode *mfs_vnode;        /* vnode associated with this mfsnode */
        struct bufq mfs_bufq;           /* bufq for MFS I/O */
        caddr_t mfs_baseoff;            /* base of file system in memory */
        long    mfs_size;               /* size of memory file system */
        pid_t   mfs_tid;                /* supporting thread's tid */
        struct  buf *mfs_buflist;       /* list of I/O requests */
        int     mfs_shutdown;           /* shutdown request */
};

/*
 * Convert between mfsnode pointers and vnode pointers
 */
#define VTOMFS(vp)      ((struct mfsnode *)(vp)->v_data)
#define MFSTOV(mfsp)    ((mfsp)->mfs_vnode)