ufs_vfsops.c revision 116384 
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 116384 2003-06-15 06:36:19Z rwatson $");
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	type = cmds & SUBCMDMASK;
121	if ((u_int)type >= MAXQUOTAS)
122		return (EINVAL);
123
124	if (vfs_busy(mp, LK_NOWAIT, 0, td))
125		return (0);
126
127	switch (cmd) {
128	case Q_QUOTAON:
129		error = quotaon(td, mp, type, arg);
130		break;
131
132	case Q_QUOTAOFF:
133		error = quotaoff(td, mp, type);
134		break;
135
136	case Q_SETQUOTA:
137		error = setquota(td, mp, uid, type, arg);
138		break;
139
140	case Q_SETUSE:
141		error = setuse(td, mp, uid, type, arg);
142		break;
143
144	case Q_GETQUOTA:
145		error = getquota(td, mp, uid, type, arg);
146		break;
147
148	case Q_SYNC:
149		error = qsync(mp);
150		break;
151
152	default:
153		error = EINVAL;
154		break;
155	}
156	vfs_unbusy(mp, td);
157	return (error);
158#endif
159}
160
161/*
162 * Initial UFS filesystems, done only once.
163 */
164int
165ufs_init(vfsp)
166	struct vfsconf *vfsp;
167{
168
169	ufs_ihashinit();
170#ifdef QUOTA
171	dqinit();
172#endif
173#ifdef UFS_DIRHASH
174	ufsdirhash_init();
175#endif
176	return (0);
177}
178
179/*
180 * Uninitialise UFS filesystems, done before module unload.
181 */
182int
183ufs_uninit(vfsp)
184	struct vfsconf *vfsp;
185{
186
187	ufs_ihashuninit();
188#ifdef QUOTA
189	dquninit();
190#endif
191#ifdef UFS_DIRHASH
192	ufsdirhash_uninit();
193#endif
194	return (0);
195}
196
197/*
198 * This is the generic part of fhtovp called after the underlying
199 * filesystem has validated the file handle.
200 *
201 * Call the VFS_CHECKEXP beforehand to verify access.
202 */
203int
204ufs_fhtovp(mp, ufhp, vpp)
205	struct mount *mp;
206	struct ufid *ufhp;
207	struct vnode **vpp;
208{
209	struct inode *ip;
210	struct vnode *nvp;
211	int error;
212
213	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
214	if (error) {
215		*vpp = NULLVP;
216		return (error);
217	}
218	ip = VTOI(nvp);
219	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
220	    ip->i_effnlink <= 0) {
221		vput(nvp);
222		*vpp = NULLVP;
223		return (ESTALE);
224	}
225	*vpp = nvp;
226	return (0);
227}
228