ufs_vfsops.c revision 92462 
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 92462 2002-03-17 01:25:47Z mckusick $
40 */
41
42#include "opt_quota.h"
43
44#include <sys/param.h>
45#include <sys/systm.h>
46#include <sys/kernel.h>
47#include <sys/lock.h>
48#include <sys/malloc.h>
49#include <sys/mount.h>
50#include <sys/proc.h>
51#include <sys/socket.h>
52#include <sys/vnode.h>
53
54#include <ufs/ufs/extattr.h>
55#include <ufs/ufs/quota.h>
56#include <ufs/ufs/inode.h>
57#include <ufs/ufs/ufsmount.h>
58#include <ufs/ufs/ufs_extern.h>
59
60MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure");
61/*
62 * Make a filesystem operational.
63 * Nothing to do at the moment.
64 */
65/* ARGSUSED */
66int
67ufs_start(mp, flags, td)
68	struct mount *mp;
69	int flags;
70	struct thread *td;
71{
72
73	return (0);
74}
75
76/*
77 * Return the root of a filesystem.
78 */
79int
80ufs_root(mp, vpp)
81	struct mount *mp;
82	struct vnode **vpp;
83{
84	struct vnode *nvp;
85	int error;
86
87	error = VFS_VGET(mp, (ino_t)ROOTINO, LK_EXCLUSIVE, &nvp);
88	if (error)
89		return (error);
90	*vpp = nvp;
91	return (0);
92}
93
94/*
95 * Do operations associated with quotas
96 */
97int
98ufs_quotactl(mp, cmds, uid, arg, td)
99	struct mount *mp;
100	int cmds;
101	uid_t uid;
102	caddr_t arg;
103	struct thread *td;
104{
105#ifndef QUOTA
106	return (EOPNOTSUPP);
107#else
108	int cmd, type, error;
109
110	if (uid == -1)
111		uid = td->td_ucred->cr_ruid;
112	cmd = cmds >> SUBCMDSHIFT;
113
114	switch (cmd) {
115	case Q_SYNC:
116		break;
117	case Q_GETQUOTA:
118		if (uid == td->td_ucred->cr_ruid)
119			break;
120		/* fall through */
121	default:
122		if ((error = suser_xxx(0, td->td_proc, PRISON_ROOT)) != 0)
123			return (error);
124	}
125
126	type = cmds & SUBCMDMASK;
127	if ((u_int)type >= MAXQUOTAS)
128		return (EINVAL);
129	if (vfs_busy(mp, LK_NOWAIT, 0, td))
130		return (0);
131
132	switch (cmd) {
133
134	case Q_QUOTAON:
135		error = quotaon(td, mp, type, arg);
136		break;
137
138	case Q_QUOTAOFF:
139		error = quotaoff(td, mp, type);
140		break;
141
142	case Q_SETQUOTA:
143		error = setquota(mp, uid, type, arg);
144		break;
145
146	case Q_SETUSE:
147		error = setuse(mp, uid, type, arg);
148		break;
149
150	case Q_GETQUOTA:
151		error = getquota(mp, uid, type, arg);
152		break;
153
154	case Q_SYNC:
155		error = qsync(mp);
156		break;
157
158	default:
159		error = EINVAL;
160		break;
161	}
162	vfs_unbusy(mp, td);
163	return (error);
164#endif
165}
166
167/*
168 * Initial UFS filesystems, done only once.
169 */
170int
171ufs_init(vfsp)
172	struct vfsconf *vfsp;
173{
174	static int done;
175
176	if (done)
177		return (0);
178	done = 1;
179	ufs_ihashinit();
180#ifdef QUOTA
181	dqinit();
182#endif
183	return (0);
184}
185
186/*
187 * This is the generic part of fhtovp called after the underlying
188 * filesystem has validated the file handle.
189 *
190 * Call the VFS_CHECKEXP beforehand to verify access.
191 */
192int
193ufs_fhtovp(mp, ufhp, vpp)
194	register struct mount *mp;
195	struct ufid *ufhp;
196	struct vnode **vpp;
197{
198	register struct inode *ip;
199	struct vnode *nvp;
200	int error;
201
202	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
203	if (error) {
204		*vpp = NULLVP;
205		return (error);
206	}
207	ip = VTOI(nvp);
208	if (ip->i_mode == 0 ||
209	    ip->i_gen != ufhp->ufid_gen ||
210	    (VFSTOUFS(mp)->um_i_effnlink_valid ? ip->i_effnlink :
211	    ip->i_nlink) <= 0) {
212		vput(nvp);
213		*vpp = NULLVP;
214		return (ESTALE);
215	}
216	*vpp = nvp;
217	return (0);
218}
219
220