ufs_vfsops.c revision 116192 
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 */
40
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/sys/ufs/ufs/ufs_vfsops.c 116192 2003-06-11 06:34:30Z obrien $");
43
44#include "opt_quota.h"
45#include "opt_ufs.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/kernel.h>
50#include <sys/lock.h>
51#include <sys/malloc.h>
52#include <sys/mount.h>
53#include <sys/proc.h>
54#include <sys/socket.h>
55#include <sys/vnode.h>
56
57#include <ufs/ufs/extattr.h>
58#include <ufs/ufs/quota.h>
59#include <ufs/ufs/inode.h>
60#include <ufs/ufs/ufsmount.h>
61#include <ufs/ufs/ufs_extern.h>
62#ifdef UFS_DIRHASH
63#include <ufs/ufs/dir.h>
64#include <ufs/ufs/dirhash.h>
65#endif
66
67MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure");
68/*
69 * Make a filesystem operational.
70 * Nothing to do at the moment.
71 */
72/* ARGSUSED */
73int
74ufs_start(mp, flags, td)
75	struct mount *mp;
76	int flags;
77	struct thread *td;
78{
79
80	return (0);
81}
82
83/*
84 * Return the root of a filesystem.
85 */
86int
87ufs_root(mp, vpp)
88	struct mount *mp;
89	struct vnode **vpp;
90{
91	struct vnode *nvp;
92	int error;
93
94	error = VFS_VGET(mp, (ino_t)ROOTINO, LK_EXCLUSIVE, &nvp);
95	if (error)
96		return (error);
97	*vpp = nvp;
98	return (0);
99}
100
101/*
102 * Do operations associated with quotas
103 */
104int
105ufs_quotactl(mp, cmds, uid, arg, td)
106	struct mount *mp;
107	int cmds;
108	uid_t uid;
109	caddr_t arg;
110	struct thread *td;
111{
112#ifndef QUOTA
113	return (EOPNOTSUPP);
114#else
115	int cmd, type, error;
116
117	if (uid == -1)
118		uid = td->td_ucred->cr_ruid;
119	cmd = cmds >> SUBCMDSHIFT;
120
121	switch (cmd) {
122	case Q_SYNC:
123		break;
124	case Q_GETQUOTA:
125		if (uid == td->td_ucred->cr_ruid)
126			break;
127		/* FALLTHROUGH */
128	default:
129		if ((error = suser_cred(td->td_ucred, PRISON_ROOT)) != 0)
130			return (error);
131	}
132
133	type = cmds & SUBCMDMASK;
134	if ((u_int)type >= MAXQUOTAS)
135		return (EINVAL);
136	if (vfs_busy(mp, LK_NOWAIT, 0, td))
137		return (0);
138
139	switch (cmd) {
140
141	case Q_QUOTAON:
142		error = quotaon(td, mp, type, arg);
143		break;
144
145	case Q_QUOTAOFF:
146		error = quotaoff(td, mp, type);
147		break;
148
149	case Q_SETQUOTA:
150		error = setquota(mp, uid, type, arg);
151		break;
152
153	case Q_SETUSE:
154		error = setuse(mp, uid, type, arg);
155		break;
156
157	case Q_GETQUOTA:
158		error = getquota(mp, uid, type, arg);
159		break;
160
161	case Q_SYNC:
162		error = qsync(mp);
163		break;
164
165	default:
166		error = EINVAL;
167		break;
168	}
169	vfs_unbusy(mp, td);
170	return (error);
171#endif
172}
173
174/*
175 * Initial UFS filesystems, done only once.
176 */
177int
178ufs_init(vfsp)
179	struct vfsconf *vfsp;
180{
181
182	ufs_ihashinit();
183#ifdef QUOTA
184	dqinit();
185#endif
186#ifdef UFS_DIRHASH
187	ufsdirhash_init();
188#endif
189	return (0);
190}
191
192/*
193 * Uninitialise UFS filesystems, done before module unload.
194 */
195int
196ufs_uninit(vfsp)
197	struct vfsconf *vfsp;
198{
199
200	ufs_ihashuninit();
201#ifdef QUOTA
202	dquninit();
203#endif
204#ifdef UFS_DIRHASH
205	ufsdirhash_uninit();
206#endif
207	return (0);
208}
209
210/*
211 * This is the generic part of fhtovp called after the underlying
212 * filesystem has validated the file handle.
213 *
214 * Call the VFS_CHECKEXP beforehand to verify access.
215 */
216int
217ufs_fhtovp(mp, ufhp, vpp)
218	struct mount *mp;
219	struct ufid *ufhp;
220	struct vnode **vpp;
221{
222	struct inode *ip;
223	struct vnode *nvp;
224	int error;
225
226	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
227	if (error) {
228		*vpp = NULLVP;
229		return (error);
230	}
231	ip = VTOI(nvp);
232	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
233	    ip->i_effnlink <= 0) {
234		vput(nvp);
235		*vpp = NULLVP;
236		return (ESTALE);
237	}
238	*vpp = nvp;
239	return (0);
240}
241