ufs_vfsops.c revision 46112 
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. 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 *	@(#)ufs_vfsops.c	8.8 (Berkeley) 5/20/95
39 * $Id: ufs_vfsops.c,v 1.13 1999/01/28 00:57:56 dillon Exp $
40 */
41
42#include "opt_quota.h"
43
44#include <sys/param.h>
45#include <sys/kernel.h>
46#include <sys/mount.h>
47#include <sys/proc.h>
48#include <sys/malloc.h>
49#include <sys/vnode.h>
50
51#include <ufs/ufs/quota.h>
52#include <ufs/ufs/inode.h>
53#include <ufs/ufs/ufsmount.h>
54#include <ufs/ufs/ufs_extern.h>
55
56MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure");
57/*
58 * Make a filesystem operational.
59 * Nothing to do at the moment.
60 */
61/* ARGSUSED */
62int
63ufs_start(mp, flags, p)
64	struct mount *mp;
65	int flags;
66	struct proc *p;
67{
68
69	return (0);
70}
71
72/*
73 * Return the root of a filesystem.
74 */
75int
76ufs_root(mp, vpp)
77	struct mount *mp;
78	struct vnode **vpp;
79{
80	struct vnode *nvp;
81	int error;
82
83	error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp);
84	if (error)
85		return (error);
86	*vpp = nvp;
87	return (0);
88}
89
90/*
91 * Do operations associated with quotas
92 */
93int
94ufs_quotactl(mp, cmds, uid, arg, p)
95	struct mount *mp;
96	int cmds;
97	uid_t uid;
98	caddr_t arg;
99	struct proc *p;
100{
101#ifndef QUOTA
102	return (EOPNOTSUPP);
103#else
104	int cmd, type, error;
105
106	if (uid == -1)
107		uid = p->p_cred->p_ruid;
108	cmd = cmds >> SUBCMDSHIFT;
109
110	switch (cmd) {
111	case Q_SYNC:
112		break;
113	case Q_GETQUOTA:
114		if (uid == p->p_cred->p_ruid)
115			break;
116		/* fall through */
117	default:
118		if ((error = suser(p)) != 0)
119			return (error);
120	}
121
122	type = cmds & SUBCMDMASK;
123	if ((u_int)type >= MAXQUOTAS)
124		return (EINVAL);
125	if (vfs_busy(mp, LK_NOWAIT, 0, p))
126		return (0);
127
128	switch (cmd) {
129
130	case Q_QUOTAON:
131		error = quotaon(p, mp, type, arg);
132		break;
133
134	case Q_QUOTAOFF:
135		error = quotaoff(p, mp, type);
136		break;
137
138	case Q_SETQUOTA:
139		error = setquota(mp, uid, type, arg);
140		break;
141
142	case Q_SETUSE:
143		error = setuse(mp, uid, type, arg);
144		break;
145
146	case Q_GETQUOTA:
147		error = getquota(mp, uid, type, arg);
148		break;
149
150	case Q_SYNC:
151		error = qsync(mp);
152		break;
153
154	default:
155		error = EINVAL;
156		break;
157	}
158	vfs_unbusy(mp, p);
159	return (error);
160#endif
161}
162
163/*
164 * Initial UFS filesystems, done only once.
165 */
166int
167ufs_init(vfsp)
168	struct vfsconf *vfsp;
169{
170	static int done;
171
172	if (done)
173		return (0);
174	done = 1;
175	ufs_ihashinit();
176#ifdef QUOTA
177	dqinit();
178#endif
179	return (0);
180}
181
182/*
183 * This is the generic part of fhtovp called after the underlying
184 * filesystem has validated the file handle.
185 *
186 * Verify that a host should have access to a filesystem, and if so
187 * return a vnode for the presented file handle.
188 */
189int
190ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)
191	register struct mount *mp;
192	struct ufid *ufhp;
193	struct sockaddr *nam;
194	struct vnode **vpp;
195	int *exflagsp;
196	struct ucred **credanonp;
197{
198	register struct inode *ip;
199	register struct netcred *np;
200	register struct ufsmount *ump = VFSTOUFS(mp);
201	struct vnode *nvp;
202	int error;
203
204	/*
205	 * Get the export permission structure for this <mp, client> tuple.
206	 */
207	np = vfs_export_lookup(mp, &ump->um_export, nam);
208	if (np == NULL)
209		return (EACCES);
210
211	error = VFS_VGET(mp, ufhp->ufid_ino, &nvp);
212	if (error) {
213		*vpp = NULLVP;
214		return (error);
215	}
216	ip = VTOI(nvp);
217	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {
218		vput(nvp);
219		*vpp = NULLVP;
220		return (ESTALE);
221	}
222	*vpp = nvp;
223	*exflagsp = np->netc_exflags;
224	*credanonp = &np->netc_anon;
225	return (0);
226}
227