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Annotation of XNU/bsd/miscfs/nullfs/null.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
                     23: /*
                     24:  * Copyright (c) 1992, 1993
                     25:  *     The Regents of the University of California.  All rights reserved.
                     26:  *
                     27:  * This code is derived from software donated to Berkeley by
                     28:  * Jan-Simon Pendry.
                     29:  *
                     30:  * Redistribution and use in source and binary forms, with or without
                     31:  * modification, are permitted provided that the following conditions
                     32:  * are met:
                     33:  * 1. Redistributions of source code must retain the above copyright
                     34:  *    notice, this list of conditions and the following disclaimer.
                     35:  * 2. Redistributions in binary form must reproduce the above copyright
                     36:  *    notice, this list of conditions and the following disclaimer in the
                     37:  *    documentation and/or other materials provided with the distribution.
                     38:  * 3. All advertising materials mentioning features or use of this software
                     39:  *    must display the following acknowledgement:
                     40:  *     This product includes software developed by the University of
                     41:  *     California, Berkeley and its contributors.
                     42:  * 4. Neither the name of the University nor the names of its contributors
                     43:  *    may be used to endorse or promote products derived from this software
                     44:  *    without specific prior written permission.
                     45:  *
                     46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     56:  * SUCH DAMAGE.
                     57:  *
                     58:  *     @(#)null.h      8.3 (Berkeley) 8/20/94
                     59:  *
                     60:  *     null.h  8.2 (Berkeley) 1/21/94
                     61:  */
                     62: 
                     63: struct null_args {
                     64:        char            *target;        /* Target of loopback  */
                     65: };
                     66: 
                     67: struct null_mount {
                     68:        struct mount    *nullm_vfs;
                     69:        struct vnode    *nullm_rootvp;  /* Reference to root null_node */
                     70: };
                     71: 
                     72: #ifdef KERNEL
                     73: /*
                     74:  * A cache of vnode references
                     75:  */
                     76: struct null_node {
                     77:        LIST_ENTRY(null_node)   null_hash;      /* Hash list */
                     78:        struct vnode            *null_lowervp;  /* VREFed once */
                     79:        struct vnode            *null_vnode;    /* Back pointer */
                     80: };
                     81: 
                     82: extern int null_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp));
                     83: 
                     84: #define        MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
                     85: #define        VTONULL(vp) ((struct null_node *)(vp)->v_data)
                     86: #define        NULLTOV(xp) ((xp)->null_vnode)
                     87: #ifdef NULLFS_DIAGNOSTIC
                     88: extern struct vnode *null_checkvp __P((struct vnode *vp, char *fil, int lno));
                     89: #define        NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
                     90: #else
                     91: #define        NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
                     92: #endif
                     93: 
                     94: extern int (**null_vnodeop_p)();
                     95: extern struct vfsops null_vfsops;
                     96: #endif /* KERNEL */

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