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umap.h revision 1.9 
      1 /*	$NetBSD: umap.h,v 1.9 1999/07/08 01:19:06 wrstuden Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software donated to Berkeley by
      8  * the UCLA Ficus project.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	from: @(#)null_vnops.c       1.5 (Berkeley) 7/10/92
     39  *	@(#)umap.h	8.4 (Berkeley) 8/20/94
     40  */
     41 
     42 #include <miscfs/genfs/layer.h>
     43 
     44 #define MAPFILEENTRIES 64
     45 #define GMAPFILEENTRIES 16
     46 #define NOBODY 32767
     47 #define NULLGROUP 65534
     48 
     49 struct umap_args {
     50 	struct layer_args la;		/* generic layerfs args. Includes
     51 					 * target and export info */
     52 #define	umap_target	la.target
     53 #define	umap_export	la.export
     54 	int 		nentries;       /* # of entries in user map array */
     55 	int 		gnentries;	/* # of entries in group map array */
     56 	u_long 		(*mapdata)[2];	/* pointer to array of user mappings */
     57 	u_long 		(*gmapdata)[2];	/* pointer to array of group mappings */
     58 };
     59 
     60 #ifdef _KERNEL
     61 
     62 struct umap_mount {
     63 	struct layer_mount lm;
     64 	int             info_nentries;  /* number of uid mappings */
     65 	int		info_gnentries;	/* number of gid mappings */
     66 	u_long		info_mapdata[MAPFILEENTRIES][2]; /* mapping data for
     67 	    user mapping in ficus */
     68 	u_long		info_gmapdata[GMAPFILEENTRIES][2]; /*mapping data for
     69 	    group mapping in ficus */
     70 };
     71 #define	umapm_vfs		lm.layerm_vfs
     72 #define	umapm_rootvp		lm.layerm_rootvp
     73 #define	umapm_export		lm.layerm_export
     74 #define	umapm_flags		lm.layerm_flags
     75 #define	umapm_size		lm.layerm_size
     76 #define	umapm_tag		lm.layerm_tag
     77 #define	umapm_bypass		lm.layerm_bypass
     78 #define	umapm_alloc		lm.layerm_alloc
     79 #define	umapm_vnodeop_p		lm.layerm_vnodeop_p
     80 #define	umapm_node_hashtbl	lm.layerm_node_hashtbl
     81 #define	umapm_node_hash		lm.layerm_node_hash
     82 #define	umapm_hashlock		lm.layerm_hashlock
     83 
     84 /*
     85  * A cache of vnode references
     86  */
     87 struct umap_node {
     88 	struct	layer_node	ln;
     89 };
     90 
     91 u_long umap_reverse_findid __P((u_long id, u_long map[][2], int nentries));
     92 void umap_mapids __P((struct mount *v_mount, struct ucred *credp));
     93 
     94 #define	umap_hash	ln.layer_hash
     95 #define	umap_lowervp	ln.layer_lowervp
     96 #define	umap_vnode	ln.layer_vnode
     97 #define	umap_flags	ln.layer_flags
     98 
     99 #define	MOUNTTOUMAPMOUNT(mp) ((struct umap_mount *)((mp)->mnt_data))
    100 #define	VTOUMAP(vp) ((struct umap_node *)(vp)->v_data)
    101 #define UMAPTOV(xp) ((xp)->umap_vnode)
    102 #ifdef UMAPFS_DIAGNOSTIC
    103 #define	UMAPVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__)
    104 #else
    105 #define	UMAPVPTOLOWERVP(vp) (VTOUMAP(vp)->umap_lowervp)
    106 #endif
    107 
    108 extern int (**umap_vnodeop_p) __P((void *));
    109 extern struct vfsops umapfs_vfsops;
    110 
    111 int     umap_bypass     __P((void *));
    112 
    113 #define NUMAPNODECACHE	16
    114 
    115 #endif /* _KERNEL */
    116