FreeBSD/Linux Kernel Cross Reference
sys/miscfs/umapfs/umap.h

     /*
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software donated to Berkeley by
      * the UCLA Ficus project.
      *
      * 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.
     *
     *      @(#)umap.h      8.4 (Berkeley) 8/20/94
     *
     * $FreeBSD$
     */
    
    #define MAPFILEENTRIES 64
    #define GMAPFILEENTRIES 16
    #define NOBODY 32767
    #define NULLGROUP 65534
    
    struct umap_args {
            char            *target;        /* Target of loopback  */
            int             nentries;       /* # of entries in user map array */
            int             gnentries;      /* # of entries in group map array */
            u_long          (*mapdata)[2];  /* pointer to array of user mappings */
            u_long          (*gmapdata)[2]; /* pointer to array of group mappings */
    };
    
    struct umap_mount {
            struct mount    *umapm_vfs;
            struct vnode    *umapm_rootvp;  /* Reference to root umap_node */
            int             info_nentries;  /* number of uid mappings */
            int             info_gnentries; /* number of gid mappings */
            u_long          info_mapdata[MAPFILEENTRIES][2]; /* mapping data for
                user mapping in ficus */
            u_long          info_gmapdata[GMAPFILEENTRIES][2]; /*mapping data for
                group mapping in ficus */
    };
    
    #ifdef KERNEL
    /*
     * A cache of vnode references
     */
    struct umap_node {
            LIST_ENTRY(umap_node) umap_hash;        /* Hash list */
            struct vnode    *umap_lowervp;  /* Aliased vnode - VREFed once */
            struct vnode    *umap_vnode;    /* Back pointer to vnode/umap_node */
    };
    
    extern int umapfs_init __P((struct vfsconf *vfsp));
    extern int umap_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp));
    extern u_long umap_reverse_findid __P((u_long id, u_long map[][2], int nentries));
    extern void umap_mapids __P((struct mount *v_mount, struct ucred *credp));
    
    #define MOUNTTOUMAPMOUNT(mp) ((struct umap_mount *)((mp)->mnt_data))
    #define VTOUMAP(vp) ((struct umap_node *)(vp)->v_data)
    #define UMAPTOV(xp) ((xp)->umap_vnode)
    #ifdef UMAPFS_DIAGNOSTIC
    extern struct vnode *umap_checkvp __P((struct vnode *vp, char *fil, int lno));
    #define UMAPVPTOLOWERVP(vp) umap_checkvp((vp), __FILE__, __LINE__)
    #else
    #define UMAPVPTOLOWERVP(vp) (VTOUMAP(vp)->umap_lowervp)
    #endif
    
    extern vop_t **umap_vnodeop_p;
    #endif /* KERNEL */

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