1 /* $NetBSD: umap.h,v 1.7 1997/10/06 09:32:35 thorpej 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 8.3 (Berkeley) 1/21/94 40 */ 41 42 #define MAPFILEENTRIES 64 43 #define GMAPFILEENTRIES 16 44 #define NOBODY 32767 45 #define NULLGROUP 65534 46 47 struct umap_args { 48 char *target; /* Target of loopback */ 49 int nentries; /* # of entries in user map array */ 50 int gnentries; /* # of entries in group map array */ 51 u_long (*mapdata)[2]; /* pointer to array of user mappings */ 52 u_long (*gmapdata)[2]; /* pointer to array of group mappings */ 53 }; 54 55 struct umap_mount { 56 struct mount *umapm_vfs; 57 struct vnode *umapm_rootvp; /* Reference to root umap_node */ 58 int info_nentries; /* number of uid mappings */ 59 int info_gnentries; /* number of gid mappings */ 60 u_long info_mapdata[MAPFILEENTRIES][2]; /* mapping data for 61 user mapping in ficus */ 62 u_long info_gmapdata[GMAPFILEENTRIES][2]; /*mapping data for 63 group mapping in ficus */ 64 }; 65 66 #ifdef _KERNEL 67 /* 68 * A cache of vnode references 69 */ 70 struct umap_node { 71 LIST_ENTRY(umap_node) umap_hash; /* Hash list */ 72 struct vnode *umap_lowervp; /* Aliased vnode - VREFed once */ 73 struct vnode *umap_vnode; /* Back pointer to vnode/umap_node */ 74 }; 75 76 extern int umap_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp)); 77 extern u_long umap_reverse_findid __P((u_long id, u_long map[][2], int nentries)); 78 extern void umap_mapids __P((struct mount *v_mount, struct ucred *credp)); 79 80 #define MOUNTTOUMAPMOUNT(mp) ((struct umap_mount *)((mp)->mnt_data)) 81 #define VTOUMAP(vp) ((struct umap_node *)(vp)->v_data) 82 #define UMAPTOV(xp) ((xp)->umap_vnode) 83 #ifdef UMAPFS_DIAGNOSTIC 84 extern struct vnode *umap_checkvp __P((struct vnode *vp, char *fil, int lno)); 85 #define UMAPVPTOLOWERVP(vp) umap_checkvp((vp), __FILE__, __LINE__) 86 #else 87 #define UMAPVPTOLOWERVP(vp) (VTOUMAP(vp)->umap_lowervp) 88 #endif 89 90 extern int (**umap_vnodeop_p) __P((void *)); 91 extern struct vfsops umapfs_vfsops; 92 93 void umapfs_init __P((void)); 94 95 #endif /* _KERNEL */ 96