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Annotation of kernel/bsd/miscfs/nullfs/null.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1992, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * This code is derived from software donated to Berkeley by
        !            31:  * Jan-Simon Pendry.
        !            32:  *
        !            33:  * Redistribution and use in source and binary forms, with or without
        !            34:  * modification, are permitted provided that the following conditions
        !            35:  * are met:
        !            36:  * 1. Redistributions of source code must retain the above copyright
        !            37:  *    notice, this list of conditions and the following disclaimer.
        !            38:  * 2. Redistributions in binary form must reproduce the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer in the
        !            40:  *    documentation and/or other materials provided with the distribution.
        !            41:  * 3. All advertising materials mentioning features or use of this software
        !            42:  *    must display the following acknowledgement:
        !            43:  *     This product includes software developed by the University of
        !            44:  *     California, Berkeley and its contributors.
        !            45:  * 4. Neither the name of the University nor the names of its contributors
        !            46:  *    may be used to endorse or promote products derived from this software
        !            47:  *    without specific prior written permission.
        !            48:  *
        !            49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            59:  * SUCH DAMAGE.
        !            60:  *
        !            61:  *     @(#)null.h      8.3 (Berkeley) 8/20/94
        !            62:  *
        !            63:  *     null.h  8.2 (Berkeley) 1/21/94
        !            64:  */
        !            65: 
        !            66: struct null_args {
        !            67:        char            *target;        /* Target of loopback  */
        !            68: };
        !            69: 
        !            70: struct null_mount {
        !            71:        struct mount    *nullm_vfs;
        !            72:        struct vnode    *nullm_rootvp;  /* Reference to root null_node */
        !            73: };
        !            74: 
        !            75: #ifdef _KERNEL
        !            76: /*
        !            77:  * A cache of vnode references
        !            78:  */
        !            79: struct null_node {
        !            80:        LIST_ENTRY(null_node)   null_hash;      /* Hash list */
        !            81:        struct vnode            *null_lowervp;  /* VREFed once */
        !            82:        struct vnode            *null_vnode;    /* Back pointer */
        !            83: };
        !            84: 
        !            85: extern int null_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp));
        !            86: 
        !            87: #define        MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
        !            88: #define        VTONULL(vp) ((struct null_node *)(vp)->v_data)
        !            89: #define        NULLTOV(xp) ((xp)->null_vnode)
        !            90: #ifdef NULLFS_DIAGNOSTIC
        !            91: extern struct vnode *null_checkvp __P((struct vnode *vp, char *fil, int lno));
        !            92: #define        NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
        !            93: #else
        !            94: #define        NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
        !            95: #endif
        !            96: 
        !            97: extern int (**null_vnodeop_p)();
        !            98: extern struct vfsops null_vfsops;
        !            99: #endif /* _KERNEL */

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