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Diffstat (limited to 'sys/fs/nullfs/null.h')
| -rw-r--r-- | sys/fs/nullfs/null.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/sys/fs/nullfs/null.h b/sys/fs/nullfs/null.h new file mode 100644 index 0000000..14286ff --- /dev/null +++ b/sys/fs/nullfs/null.h @@ -0,0 +1,75 @@ +/* + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software donated to Berkeley by + * Jan-Simon Pendry. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + * + * @(#)null.h 8.2 (Berkeley) 1/21/94 + * + * $Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp jsp $ + */ + +struct null_args { + char *target; /* Target of loopback */ +}; + +struct null_mount { + struct mount *nullm_vfs; + struct vnode *nullm_rootvp; /* Reference to root null_node */ +}; + +#ifdef KERNEL +/* + * A cache of vnode references + */ +struct null_node { + struct null_node *null_forw; /* Hash chain */ + struct null_node *null_back; + struct vnode *null_lowervp; /* VREFed once */ + struct vnode *null_vnode; /* Back pointer */ +}; + +extern int null_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp)); + +#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data)) +#define VTONULL(vp) ((struct null_node *)(vp)->v_data) +#define NULLTOV(xp) ((xp)->null_vnode) +#ifdef NULLFS_DIAGNOSTIC +extern struct vnode *null_checkvp __P((struct vnode *vp, char *fil, int lno)); +#define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__) +#else +#define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp) +#endif + +extern int (**null_vnodeop_p)(); +extern struct vfsops null_vfsops; +#endif /* KERNEL */ |
