1 /* $OpenBSD: ufs_vfsops.c,v 1.15 2006/04/04 11:21:40 pedro Exp $ */
2 /* $NetBSD: ufs_vfsops.c,v 1.4 1996/02/09 22:36:12 christos Exp $ */
3
4 /*
5 * Copyright (c) 1991, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)ufs_vfsops.c 8.4 (Berkeley) 4/16/94
38 */
39
40 #include <sys/param.h>
41 #include <sys/mbuf.h>
42 #include <sys/mount.h>
43 #include <sys/proc.h>
44 #include <sys/buf.h>
45 #include <sys/vnode.h>
46 #include <sys/malloc.h>
47
48 #include <miscfs/specfs/specdev.h>
49
50 #include <ufs/ufs/quota.h>
51 #include <ufs/ufs/inode.h>
52 #include <ufs/ufs/ufsmount.h>
53 #include <ufs/ufs/ufs_extern.h>
54 #ifdef UFS_DIRHASH
55 #include <ufs/ufs/dir.h>
56 #include <ufs/ufs/dirhash.h>
57 #endif
58
59 /*
60 * Make a filesystem operational.
61 * Nothing to do at the moment.
62 */
63 /* ARGSUSED */
64 int
65 ufs_start(struct mount *mp, int flags, struct proc *p)
66 {
67 return (0);
68 }
69
70 /*
71 * Return the root of a filesystem.
72 */
73 int
74 ufs_root(struct mount *mp, struct vnode **vpp)
75 {
76 struct vnode *nvp;
77 int error;
78
79 if ((error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp)) != 0)
80 return (error);
81 *vpp = nvp;
82 return (0);
83 }
84
85 /*
86 * Verify a remote client has export rights and return these rights via.
87 * exflagsp and credanonp.
88 */
89 int
90 ufs_check_export(struct mount *mp, struct mbuf *nam, int *exflagsp,
91 struct ucred **credanonp)
92 {
93 struct netcred *np;
94 struct ufsmount *ump = VFSTOUFS(mp);
95
96 /*
97 * Get the export permission structure for this <mp, client> tuple.
98 */
99 np = vfs_export_lookup(mp, &ump->um_export, nam);
100 if (np == NULL)
101 return (EACCES);
102
103 *exflagsp = np->netc_exflags;
104 *credanonp = &np->netc_anon;
105 return (0);
106 }
107
108 /*
109 * Initialize UFS file systems, done only once.
110 */
111 int
112 ufs_init(struct vfsconf *vfsp)
113 {
114 static int done;
115
116 if (done)
117 return (0);
118 done = 1;
119 ufs_ihashinit();
120 ufs_quota_init();
121 #ifdef UFS_DIRHASH
122 ufsdirhash_init();
123 #endif
124
125 return (0);
126 }
127
128 /*
129 * This is the generic part of fhtovp called after the underlying
130 * filesystem has validated the file handle.
131 */
132 int
133 ufs_fhtovp(struct mount *mp, struct ufid *ufhp, struct vnode **vpp)
134 {
135 struct inode *ip;
136 struct vnode *nvp;
137 int error;
138
139 if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) {
140 *vpp = NULLVP;
141 return (error);
142 }
143 ip = VTOI(nvp);
144 if (DIP(ip, mode) == 0 || DIP(ip, gen) != ufhp->ufid_gen) {
145 vput(nvp);
146 *vpp = NULLVP;
147 return (ESTALE);
148 }
149 *vpp = nvp;
150 return (0);
151 }