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Annotation of kernel/bsd/miscfs/umapfs/umap.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: /*     $NetBSD: umap.h,v 1.4 1995/03/29 22:09:57 briggs Exp $  */
        !            26: 
        !            27: /*
        !            28:  * Copyright (c) 1992, 1993
        !            29:  *     The Regents of the University of California.  All rights reserved.
        !            30:  *
        !            31:  * This code is derived from software donated to Berkeley by
        !            32:  * the UCLA Ficus project.
        !            33:  *
        !            34:  * Redistribution and use in source and binary forms, with or without
        !            35:  * modification, are permitted provided that the following conditions
        !            36:  * are met:
        !            37:  * 1. Redistributions of source code must retain the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer.
        !            39:  * 2. Redistributions in binary form must reproduce the above copyright
        !            40:  *    notice, this list of conditions and the following disclaimer in the
        !            41:  *    documentation and/or other materials provided with the distribution.
        !            42:  * 3. All advertising materials mentioning features or use of this software
        !            43:  *    must display the following acknowledgement:
        !            44:  *     This product includes software developed by the University of
        !            45:  *     California, Berkeley and its contributors.
        !            46:  * 4. Neither the name of the University nor the names of its contributors
        !            47:  *    may be used to endorse or promote products derived from this software
        !            48:  *    without specific prior written permission.
        !            49:  *
        !            50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            60:  * SUCH DAMAGE.
        !            61:  *
        !            62:  *     from: @(#)null_vnops.c       1.5 (Berkeley) 7/10/92
        !            63:  *     @(#)umap.h      8.3 (Berkeley) 1/21/94
        !            64:  */
        !            65: 
        !            66: #define MAPFILEENTRIES 64
        !            67: #define GMAPFILEENTRIES 16
        !            68: #define NOBODY 32767
        !            69: #define NULLGROUP 65534
        !            70: 
        !            71: struct umap_args {
        !            72:        char            *target;        /* Target of loopback  */
        !            73:        int             nentries;       /* # of entries in user map array */
        !            74:        int             gnentries;      /* # of entries in group map array */
        !            75:        uid_t           (*mapdata)[2];  /* pointer to array of user mappings */
        !            76:        gid_t           (*gmapdata)[2]; /* pointer to array of group mappings */
        !            77: };
        !            78: 
        !            79: struct umap_mount {
        !            80:        struct mount    *umapm_vfs;
        !            81:        struct vnode    *umapm_rootvp;  /* Reference to root umap_node */
        !            82:        int             info_nentries;  /* number of uid mappings */
        !            83:        int             info_gnentries; /* number of gid mappings */
        !            84:        uid_t           info_mapdata[MAPFILEENTRIES][2]; /* mapping data for 
        !            85:            user mapping in ficus */
        !            86:        gid_t           info_gmapdata[GMAPFILEENTRIES][2]; /*mapping data for 
        !            87:            group mapping in ficus */
        !            88: };
        !            89: 
        !            90: #ifdef _KERNEL
        !            91: /*
        !            92:  * A cache of vnode references
        !            93:  */
        !            94: struct umap_node {
        !            95:        LIST_ENTRY(umap_node) umap_hash;        /* Hash list */
        !            96:        struct vnode    *umap_lowervp;  /* Aliased vnode - VREFed once */
        !            97:        struct vnode    *umap_vnode;    /* Back pointer to vnode/umap_node */
        !            98: };
        !            99: 
        !           100: extern int umap_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp));
        !           101: extern u_long umap_reverse_findid __P((u_long id, u_long map[][2], int nentries));
        !           102: extern void umap_mapids __P((struct mount *v_mount, struct ucred *credp));
        !           103: 
        !           104: #define        MOUNTTOUMAPMOUNT(mp) ((struct umap_mount *)((mp)->mnt_data))
        !           105: #define        VTOUMAP(vp) ((struct umap_node *)(vp)->v_data)
        !           106: #define UMAPTOV(xp) ((xp)->umap_vnode)
        !           107: #ifdef UMAPFS_DIAGNOSTIC
        !           108: extern struct vnode *umap_checkvp __P((struct vnode *vp, char *fil, int lno));
        !           109: #define        UMAPVPTOLOWERVP(vp) umap_checkvp((vp), __FILE__, __LINE__)
        !           110: #else
        !           111: #define        UMAPVPTOLOWERVP(vp) (VTOUMAP(vp)->umap_lowervp)
        !           112: #endif
        !           113: 
        !           114: extern int (**umap_vnodeop_p)();
        !           115: extern struct vfsops umap_vfsops;
        !           116: #endif /* _KERNEL */

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