The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1992, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software donated to Berkeley by
    6  * the UCLA Ficus project.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)umap.h      8.4 (Berkeley) 8/20/94
   33  *
   34  * $FreeBSD$
   35  */
   36 
   37 #define MAPFILEENTRIES 64
   38 #define GMAPFILEENTRIES 16
   39 #define NOBODY 32767
   40 #define NULLGROUP 65534
   41 
   42 struct umap_args {
   43         char            *target;        /* Target of loopback  */
   44         int             nentries;       /* # of entries in user map array */
   45         int             gnentries;      /* # of entries in group map array */
   46         u_long          (*mapdata)[2];  /* pointer to array of user mappings */
   47         u_long          (*gmapdata)[2]; /* pointer to array of group mappings */
   48 };
   49 
   50 struct umap_mount {
   51         struct mount    *umapm_vfs;
   52         struct vnode    *umapm_rootvp;  /* Reference to root umap_node */
   53         int             info_nentries;  /* number of uid mappings */
   54         int             info_gnentries; /* number of gid mappings */
   55         u_long          info_mapdata[MAPFILEENTRIES][2]; /* mapping data for
   56             user mapping in ficus */
   57         u_long          info_gmapdata[GMAPFILEENTRIES][2]; /*mapping data for
   58             group mapping in ficus */
   59 };
   60 
   61 #ifdef _KERNEL
   62 /*
   63  * A cache of vnode references
   64  */
   65 struct umap_node {
   66         LIST_ENTRY(umap_node) umap_hash;        /* Hash list */
   67         struct vnode    *umap_lowervp;  /* Aliased vnode - VREFed once */
   68         struct vnode    *umap_vnode;    /* Back pointer to vnode/umap_node */
   69 };
   70 
   71 extern int umapfs_init(struct vfsconf *vfsp);
   72 extern int umap_node_create(struct mount *mp, struct vnode *target, struct vnode **vpp);
   73 extern u_long umap_reverse_findid(u_long id, u_long map[][2], int nentries);
   74 extern void umap_mapids(struct mount *v_mount, struct ucred *credp);
   75 
   76 #define MOUNTTOUMAPMOUNT(mp) ((struct umap_mount *)((mp)->mnt_data))
   77 #define VTOUMAP(vp) ((struct umap_node *)(vp)->v_data)
   78 #define UMAPTOV(xp) ((xp)->umap_vnode)
   79 #ifdef DIAGNOSTIC
   80 extern struct vnode *umap_checkvp(struct vnode *vp, char *fil, int lno);
   81 #define UMAPVPTOLOWERVP(vp) umap_checkvp((vp), __FILE__, __LINE__)
   82 #else
   83 #define UMAPVPTOLOWERVP(vp) (VTOUMAP(vp)->umap_lowervp)
   84 #endif
   85 
   86 #endif /* _KERNEL */

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