1 /* $OpenBSD: ufs_vfsops.c,v 1.20 2023/03/08 04:43:09 guenther 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/vnode.h>
44 #include <sys/malloc.h>
45 #include <sys/specdev.h>
46
47 #include <ufs/ufs/quota.h>
48 #include <ufs/ufs/inode.h>
49 #include <ufs/ufs/ufsmount.h>
50 #include <ufs/ufs/ufs_extern.h>
51 #ifdef UFS_DIRHASH
52 #include <ufs/ufs/dir.h>
53 #include <ufs/ufs/dirhash.h>
54 #endif
55
56 /*
57 * Make a filesystem operational.
58 * Nothing to do at the moment.
59 */
60 int
ufs_start(struct mount * mp,int flags,struct proc * p)61 ufs_start(struct mount *mp, int flags, struct proc *p)
62 {
63 return (0);
64 }
65
66 /*
67 * Return the root of a filesystem.
68 */
69 int
ufs_root(struct mount * mp,struct vnode ** vpp)70 ufs_root(struct mount *mp, struct vnode **vpp)
71 {
72 struct vnode *nvp;
73 int error;
74
75 if ((error = VFS_VGET(mp, ROOTINO, &nvp)) != 0)
76 return (error);
77 *vpp = nvp;
78 return (0);
79 }
80
81 /*
82 * Verify a remote client has export rights and return these rights via.
83 * exflagsp and credanonp.
84 */
85 int
ufs_check_export(struct mount * mp,struct mbuf * nam,int * exflagsp,struct ucred ** credanonp)86 ufs_check_export(struct mount *mp, struct mbuf *nam, int *exflagsp,
87 struct ucred **credanonp)
88 {
89 struct netcred *np;
90 struct ufsmount *ump = VFSTOUFS(mp);
91
92 /*
93 * Get the export permission structure for this <mp, client> tuple.
94 */
95 np = vfs_export_lookup(mp, &ump->um_export, nam);
96 if (np == NULL)
97 return (EACCES);
98
99 *exflagsp = np->netc_exflags;
100 *credanonp = &np->netc_anon;
101 return (0);
102 }
103
104 /*
105 * Initialize UFS file systems, done only once.
106 */
107 int
ufs_init(struct vfsconf * vfsp)108 ufs_init(struct vfsconf *vfsp)
109 {
110 static int done;
111
112 if (done)
113 return (0);
114 done = 1;
115 ufs_ihashinit();
116 ufs_quota_init();
117 #ifdef UFS_DIRHASH
118 ufsdirhash_init();
119 #endif
120
121 return (0);
122 }
123
124 /*
125 * This is the generic part of fhtovp called after the underlying
126 * filesystem has validated the file handle.
127 */
128 int
ufs_fhtovp(struct mount * mp,struct ufid * ufhp,struct vnode ** vpp)129 ufs_fhtovp(struct mount *mp, struct ufid *ufhp, struct vnode **vpp)
130 {
131 struct inode *ip;
132 struct vnode *nvp;
133 int error;
134
135 if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) {
136 *vpp = NULLVP;
137 return (error);
138 }
139 ip = VTOI(nvp);
140 if (DIP(ip, mode) == 0 || DIP(ip, gen) != ufhp->ufid_gen) {
141 vput(nvp);
142 *vpp = NULLVP;
143 return (ESTALE);
144 }
145 *vpp = nvp;
146 return (0);
147 }
148