1/* $NetBSD: umap.h,v 1.19 2019/08/20 21:18:10 perseant 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
45struct 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 u_long fsid; /* user-supplied per-fs ident */
55};
56
57#ifdef _KERNEL
58
59struct umap_mount {
60 struct layer_mount lm;
61 int info_nentries; /* number of uid mappings */
62 int info_gnentries; /* number of gid mappings */
63 u_long info_mapdata[MAPFILEENTRIES][2]; /* mapping data for
64 user mapping in ficus */
65 u_long info_gmapdata[GMAPFILEENTRIES][2]; /*mapping data for
66 group mapping in ficus */
67};
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 */
83struct umap_node {
84 struct layer_node ln;
85};
86
87u_long umap_reverse_findid(u_long id, u_long map[][2], int nentries);
88void 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
104extern int (**umap_vnodeop_p)(void *);
105extern struct vfsops umapfs_vfsops;
106
107int umap_bypass(void *);
108
109#define NUMAPNODECACHE 16
110
111#endif /* _KERNEL */