sys/vfs/mfs/mfsnode.h

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)mfsnode.h   8.3 (Berkeley) 5/19/95
  34  * $FreeBSD: src/sys/ufs/mfs/mfsnode.h,v 1.12.2.2 2001/07/04 17:35:21 tegge Exp $
  35  * $DragonFly: src/sys/vfs/mfs/mfsnode.h,v 1.6 2006/09/10 01:26:41 dillon Exp $
  36  */
  37
  38 #ifndef _UFS_MFS_MFSNODE_H_
  39 #define _UFS_MFS_MFSNODE_H_
  40
  41 /*
  42  * This structure defines the control data for the memory based file system.
  43  */
  44
  45 struct mfsnode {
  46         struct  vnode *mfs_vnode;       /* vnode associated with this mfsnode */
  47         caddr_t mfs_baseoff;            /* base of file system in memory */
  48         long    mfs_size;               /* size of memory file system */
  49         struct thread *mfs_td;          /* supporting thread */
  50         struct bio_queue_head bio_queue; /* list of I/O requests */
  51         cdev_t  mfs_dev;                /* underlying device */
  52         int     mfs_active;
  53         long    mfs_spare[1];
  54 };
  55
  56 /*
  57  * Convert between mfsnode pointers and vnode pointers
  58  */
  59 #define VTOMFS(vp)      ((struct mfsnode *)(vp)->v_data)
  60 #define MFSTOV(mfsp)    ((mfsp)->mfs_vnode)
  61
  62 #ifdef MALLOC_DECLARE
  63 MALLOC_DECLARE(M_MFSNODE);
  64 #endif
  65
  66 #endif