1 /*
2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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 * @(#)ufs_vfsops.c 8.8 (Berkeley) 5/20/95
35 * $FreeBSD: src/sys/ufs/ufs/ufs_vfsops.c,v 1.17.2.3 2001/10/14 19:08:16 iedowse Exp $
36 */
37
38 #include "opt_quota.h"
39
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/mount.h>
43 #include <sys/proc.h>
44 #include <sys/caps.h>
45 #include <sys/malloc.h>
46 #include <sys/vnode.h>
47
48 #include "quota.h"
49 #include "inode.h"
50 #include "ufsmount.h"
51 #include "ufs_extern.h"
52
53 MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure");
54 /*
55 * Return the root of a filesystem.
56 */
57 int
ufs_root(struct mount * mp,struct vnode ** vpp)58 ufs_root(struct mount *mp, struct vnode **vpp)
59 {
60 struct vnode *nvp;
61 int error;
62
63 error = VFS_VGET(mp, NULL, (ino_t)UFS_ROOTINO, &nvp);
64 if (error)
65 return (error);
66 *vpp = nvp;
67 return (0);
68 }
69
70 /*
71 * Do operations associated with quotas
72 */
73 int
ufs_quotactl(struct mount * mp,int cmds,uid_t uid,caddr_t arg,struct ucred * cred)74 ufs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
75 struct ucred *cred)
76 {
77 #ifndef QUOTA
78 return (EOPNOTSUPP);
79 #else
80 int cmd, type, error;
81
82 type = cmds & SUBCMDMASK;
83 cmd = cmds >> SUBCMDSHIFT;
84
85 if (uid == -1) {
86 switch(type) {
87 case USRQUOTA:
88 uid = cred->cr_ruid;
89 break;
90 case GRPQUOTA:
91 uid = cred->cr_rgid;
92 break;
93 default:
94 return (EINVAL);
95 }
96 }
97
98 /*
99 * Check permissions.
100 */
101 switch (cmd) {
102
103 case Q_QUOTAON:
104 error = caps_priv_check(cred, SYSCAP_NOQUOTA_WR);
105 break;
106
107 case Q_QUOTAOFF:
108 error = caps_priv_check(cred, SYSCAP_NOQUOTA_WR);
109 break;
110
111 case Q_SETQUOTA:
112 error = caps_priv_check(cred, SYSCAP_NOQUOTA_WR);
113 break;
114
115 case Q_SETUSE:
116 error = caps_priv_check(cred, SYSCAP_NOQUOTA_WR);
117 break;
118
119 case Q_GETQUOTA:
120 if (uid == cred->cr_ruid)
121 error = 0;
122 else
123 error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT);
124 break;
125
126 case Q_SYNC:
127 error = 0;
128 break;
129
130 default:
131 error = EINVAL;
132 break;
133 }
134
135 if (error)
136 return (error);
137
138
139 if ((uint)type >= MAXQUOTAS)
140 return (EINVAL);
141 if (vfs_busy(mp, LK_NOWAIT))
142 return (0);
143
144 switch (cmd) {
145
146 case Q_QUOTAON:
147 error = ufs_quotaon(cred, mp, type, arg);
148 break;
149
150 case Q_QUOTAOFF:
151 error = ufs_quotaoff(mp, type);
152 break;
153
154 case Q_SETQUOTA:
155 error = ufs_setquota(mp, uid, type, arg);
156 break;
157
158 case Q_SETUSE:
159 error = ufs_setuse(mp, uid, type, arg);
160 break;
161
162 case Q_GETQUOTA:
163 error = ufs_getquota(mp, uid, type, arg);
164 break;
165
166 case Q_SYNC:
167 error = ufs_qsync(mp);
168 break;
169
170 default:
171 error = EINVAL;
172 break;
173 }
174 vfs_unbusy(mp);
175 return (error);
176 #endif
177 }
178
179 /*
180 * Initial UFS filesystems, done only once.
181 */
182 int
ufs_init(struct vfsconf * vfsp)183 ufs_init(struct vfsconf *vfsp)
184 {
185 static int done;
186
187 if (done)
188 return (0);
189 done = 1;
190 #ifdef QUOTA
191 ufs_dqinit();
192 #endif
193 return (0);
194 }
195
196 /*
197 * This is the generic part of fhtovp called after the underlying
198 * filesystem has validated the file handle.
199 *
200 * Call the VFS_CHECKEXP beforehand to verify access.
201 */
202 int
ufs_fhtovp(struct mount * mp,struct vnode * rootvp,struct ufid * ufhp,struct vnode ** vpp)203 ufs_fhtovp(struct mount *mp, struct vnode *rootvp,
204 struct ufid *ufhp, struct vnode **vpp)
205 {
206 struct inode *ip;
207 struct vnode *nvp;
208 int error;
209
210 error = VFS_VGET(mp, NULL, ufhp->ufid_ino, &nvp);
211 if (error) {
212 *vpp = NULLVP;
213 return (error);
214 }
215 ip = VTOI(nvp);
216 if (ip->i_mode == 0 ||
217 ip->i_gen != ufhp->ufid_gen ||
218 (VFSTOUFS(mp)->um_i_effnlink_valid ? ip->i_effnlink :
219 ip->i_nlink) <= 0) {
220 vput(nvp);
221 *vpp = NULLVP;
222 return (ESTALE);
223 }
224 *vpp = nvp;
225 return (0);
226 }
227
228
229 /*
230 * This is the generic part of fhtovp called after the underlying
231 * filesystem has validated the file handle.
232 *
233 * Verify that a host should have access to a filesystem.
234 */
235 int
ufs_check_export(struct mount * mp,struct sockaddr * nam,int * exflagsp,struct ucred ** credanonp)236 ufs_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp,
237 struct ucred **credanonp)
238 {
239 struct netcred *np;
240 struct ufsmount *ump;
241
242 ump = VFSTOUFS(mp);
243 /*
244 * Get the export permission structure for this <mp, client> tuple.
245 */
246 np = vfs_export_lookup(mp, &ump->um_export, nam);
247 if (np == NULL)
248 return (EACCES);
249
250 *exflagsp = np->netc_exflags;
251 *credanonp = &np->netc_anon;
252 return (0);
253 }
254