sys/miscfs/umapfs/umap.h

   1 /*      $NetBSD: umap.h,v 1.15 2006/05/14 21:32:21 elad 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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      from: @(#)null_vnops.c       1.5 (Berkeley) 7/10/92
  35  *      @(#)umap.h      8.4 (Berkeley) 8/20/94
  36  */
  37
  38 #include <miscfs/genfs/layer.h>
  39
  40 #define MAPFILEENTRIES 64
  41 #define GMAPFILEENTRIES 16
  42 #define NOBODY 32767
  43 #define NULLGROUP 65534
  44
  45 struct umap_args {
  46         struct layer_args la;           /* generic layerfs args. Includes
  47                                          * target and export info */
  48 #define umap_target     la.target
  49 #define umap_export     la.export
  50         int             nentries;       /* # of entries in user map array */
  51         int             gnentries;      /* # of entries in group map array */
  52         u_long          (*mapdata)[2];  /* pointer to array of user mappings */
  53         u_long          (*gmapdata)[2]; /* pointer to array of group mappings */
  54 };
  55
  56 #ifdef _KERNEL
  57
  58 struct umap_mount {
  59         struct layer_mount lm;
  60         int             info_nentries;  /* number of uid mappings */
  61         int             info_gnentries; /* number of gid mappings */
  62         u_long          info_mapdata[MAPFILEENTRIES][2]; /* mapping data for
  63             user mapping in ficus */
  64         u_long          info_gmapdata[GMAPFILEENTRIES][2]; /*mapping data for
  65             group mapping in ficus */
  66 };
  67 #define umapm_vfs               lm.layerm_vfs
  68 #define umapm_rootvp            lm.layerm_rootvp
  69 #define umapm_export            lm.layerm_export
  70 #define umapm_flags             lm.layerm_flags
  71 #define umapm_size              lm.layerm_size
  72 #define umapm_tag               lm.layerm_tag
  73 #define umapm_bypass            lm.layerm_bypass
  74 #define umapm_alloc             lm.layerm_alloc
  75 #define umapm_vnodeop_p         lm.layerm_vnodeop_p
  76 #define umapm_node_hashtbl      lm.layerm_node_hashtbl
  77 #define umapm_node_hash         lm.layerm_node_hash
  78 #define umapm_hashlock          lm.layerm_hashlock
  79
  80 /*
  81  * A cache of vnode references
  82  */
  83 struct umap_node {
  84         struct  layer_node      ln;
  85 };
  86
  87 u_long umap_reverse_findid(u_long id, u_long map[][2], int nentries);
  88 void umap_mapids(struct mount *v_mount, kauth_cred_t credp);
  89
  90 #define umap_hash       ln.layer_hash
  91 #define umap_lowervp    ln.layer_lowervp
  92 #define umap_vnode      ln.layer_vnode
  93 #define umap_flags      ln.layer_flags
  94
  95 #define MOUNTTOUMAPMOUNT(mp) ((struct umap_mount *)((mp)->mnt_data))
  96 #define VTOUMAP(vp) ((struct umap_node *)(vp)->v_data)
  97 #define UMAPTOV(xp) ((xp)->umap_vnode)
  98 #ifdef UMAPFS_DIAGNOSTIC
  99 #define UMAPVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__)
 100 #else
 101 #define UMAPVPTOLOWERVP(vp) (VTOUMAP(vp)->umap_lowervp)
 102 #endif
 103
 104 extern int (**umap_vnodeop_p)(void *);
 105 extern struct vfsops umapfs_vfsops;
 106
 107 int     umap_bypass(void *);
 108
 109 #define NUMAPNODECACHE  16
 110
 111 #endif /* _KERNEL */