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      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 
     41 struct 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_ */
     64