ufs_vfsops.c revision 99101 
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 * $FreeBSD: head/sys/ufs/ufs/ufs_vfsops.c 99101 2002-06-30 02:49:39Z iedowse $
40 */
41
42#include "opt_quota.h"
43#include "opt_ufs.h"
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/kernel.h>
48#include <sys/lock.h>
49#include <sys/malloc.h>
50#include <sys/mount.h>
51#include <sys/proc.h>
52#include <sys/socket.h>
53#include <sys/vnode.h>
54
55#include <ufs/ufs/extattr.h>
56#include <ufs/ufs/quota.h>
57#include <ufs/ufs/inode.h>
58#include <ufs/ufs/ufsmount.h>
59#include <ufs/ufs/ufs_extern.h>
60#ifdef UFS_DIRHASH
61#include <ufs/ufs/dir.h>
62#include <ufs/ufs/dirhash.h>
63#endif
64
65MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure");
66/*
67 * Make a filesystem operational.
68 * Nothing to do at the moment.
69 */
70/* ARGSUSED */
71int
72ufs_start(mp, flags, td)
73	struct mount *mp;
74	int flags;
75	struct thread *td;
76{
77
78	return (0);
79}
80
81/*
82 * Return the root of a filesystem.
83 */
84int
85ufs_root(mp, vpp)
86	struct mount *mp;
87	struct vnode **vpp;
88{
89	struct vnode *nvp;
90	int error;
91
92	error = VFS_VGET(mp, (ino_t)ROOTINO, LK_EXCLUSIVE, &nvp);
93	if (error)
94		return (error);
95	*vpp = nvp;
96	return (0);
97}
98
99/*
100 * Do operations associated with quotas
101 */
102int
103ufs_quotactl(mp, cmds, uid, arg, td)
104	struct mount *mp;
105	int cmds;
106	uid_t uid;
107	caddr_t arg;
108	struct thread *td;
109{
110#ifndef QUOTA
111	return (EOPNOTSUPP);
112#else
113	int cmd, type, error;
114
115	if (uid == -1)
116		uid = td->td_ucred->cr_ruid;
117	cmd = cmds >> SUBCMDSHIFT;
118
119	switch (cmd) {
120	case Q_SYNC:
121		break;
122	case Q_GETQUOTA:
123		if (uid == td->td_ucred->cr_ruid)
124			break;
125		/* fall through */
126	default:
127		if ((error = suser_cred(td->td_ucred, PRISON_ROOT)) != 0)
128			return (error);
129	}
130
131	type = cmds & SUBCMDMASK;
132	if ((u_int)type >= MAXQUOTAS)
133		return (EINVAL);
134	if (vfs_busy(mp, LK_NOWAIT, 0, td))
135		return (0);
136
137	switch (cmd) {
138
139	case Q_QUOTAON:
140		error = quotaon(td, mp, type, arg);
141		break;
142
143	case Q_QUOTAOFF:
144		error = quotaoff(td, mp, type);
145		break;
146
147	case Q_SETQUOTA:
148		error = setquota(mp, uid, type, arg);
149		break;
150
151	case Q_SETUSE:
152		error = setuse(mp, uid, type, arg);
153		break;
154
155	case Q_GETQUOTA:
156		error = getquota(mp, uid, type, arg);
157		break;
158
159	case Q_SYNC:
160		error = qsync(mp);
161		break;
162
163	default:
164		error = EINVAL;
165		break;
166	}
167	vfs_unbusy(mp, td);
168	return (error);
169#endif
170}
171
172/*
173 * Initial UFS filesystems, done only once.
174 */
175int
176ufs_init(vfsp)
177	struct vfsconf *vfsp;
178{
179
180	ufs_ihashinit();
181#ifdef QUOTA
182	dqinit();
183#endif
184#ifdef UFS_DIRHASH
185	ufsdirhash_init();
186#endif
187	return (0);
188}
189
190/*
191 * Uninitialise UFS filesystems, done before module unload.
192 */
193int
194ufs_uninit(vfsp)
195	struct vfsconf *vfsp;
196{
197
198	ufs_ihashuninit();
199#ifdef QUOTA
200	dquninit();
201#endif
202#ifdef UFS_DIRHASH
203	ufsdirhash_uninit();
204#endif
205	return (0);
206}
207
208/*
209 * This is the generic part of fhtovp called after the underlying
210 * filesystem has validated the file handle.
211 *
212 * Call the VFS_CHECKEXP beforehand to verify access.
213 */
214int
215ufs_fhtovp(mp, ufhp, vpp)
216	struct mount *mp;
217	struct ufid *ufhp;
218	struct vnode **vpp;
219{
220	struct inode *ip;
221	struct vnode *nvp;
222	int error;
223
224	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
225	if (error) {
226		*vpp = NULLVP;
227		return (error);
228	}
229	ip = VTOI(nvp);
230	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
231	    ip->i_effnlink <= 0) {
232		vput(nvp);
233		*vpp = NULLVP;
234		return (ESTALE);
235	}
236	*vpp = nvp;
237	return (0);
238}
239