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 */