ufs_vfsops.c revision 6992 
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	8.4 (Berkeley) 4/16/94
39 * $Id: ufs_vfsops.c,v 1.3 1994/10/08 06:57:28 phk Exp $
40 */
41
42#include <sys/param.h>
43#include <sys/mbuf.h>
44#include <sys/mount.h>
45#include <sys/proc.h>
46#include <sys/buf.h>
47#include <sys/vnode.h>
48#include <sys/malloc.h>
49
50#include <miscfs/specfs/specdev.h>
51
52#include <ufs/ufs/quota.h>
53#include <ufs/ufs/inode.h>
54#include <ufs/ufs/ufsmount.h>
55#include <ufs/ufs/ufs_extern.h>
56
57/*
58 * Flag to permit forcible unmounting.
59 */
60int doforce = 1;
61
62/*
63 * Make a filesystem operational.
64 * Nothing to do at the moment.
65 */
66/* ARGSUSED */
67int
68ufs_start(mp, flags, p)
69	struct mount *mp;
70	int flags;
71	struct proc *p;
72{
73
74	return (0);
75}
76
77/*
78 * Return the root of a filesystem.
79 */
80int
81ufs_root(mp, vpp)
82	struct mount *mp;
83	struct vnode **vpp;
84{
85	struct vnode *nvp;
86	int error;
87
88	error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp);
89	if (error)
90		return (error);
91	*vpp = nvp;
92	return (0);
93}
94
95/*
96 * Do operations associated with quotas
97 */
98int
99ufs_quotactl(mp, cmds, uid, arg, p)
100	struct mount *mp;
101	int cmds;
102	uid_t uid;
103	caddr_t arg;
104	struct proc *p;
105{
106#ifndef QUOTA
107	return (EOPNOTSUPP);
108#else
109	int cmd, type, error;
110
111	if (uid == -1)
112		uid = p->p_cred->p_ruid;
113	cmd = cmds >> SUBCMDSHIFT;
114
115	switch (cmd) {
116	case Q_SYNC:
117		break;
118	case Q_GETQUOTA:
119		if (uid == p->p_cred->p_ruid)
120			break;
121		/* fall through */
122	default:
123		if (error = suser(p->p_ucred, &p->p_acflag))
124			return (error);
125	}
126
127	type = cmds & SUBCMDMASK;
128	if ((u_int)type >= MAXQUOTAS)
129		return (EINVAL);
130
131	switch (cmd) {
132
133	case Q_QUOTAON:
134		return (quotaon(p, mp, type, arg));
135
136	case Q_QUOTAOFF:
137		if (vfs_busy(mp))
138			return (0);
139		error = quotaoff(p, mp, type);
140		vfs_unbusy(mp);
141		return (error);
142
143	case Q_SETQUOTA:
144		return (setquota(mp, uid, type, arg));
145
146	case Q_SETUSE:
147		return (setuse(mp, uid, type, arg));
148
149	case Q_GETQUOTA:
150		return (getquota(mp, uid, type, arg));
151
152	case Q_SYNC:
153		if (vfs_busy(mp))
154			return (0);
155		error = qsync(mp);
156		vfs_unbusy(mp);
157		return (error);
158
159	default:
160		return (EINVAL);
161	}
162	/* NOTREACHED */
163#endif
164}
165
166/*
167 * This is the generic part of fhtovp called after the underlying
168 * filesystem has validated the file handle.
169 *
170 * Verify that a host should have access to a filesystem, and if so
171 * return a vnode for the presented file handle.
172 */
173int
174ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)
175	register struct mount *mp;
176	struct ufid *ufhp;
177	struct mbuf *nam;
178	struct vnode **vpp;
179	int *exflagsp;
180	struct ucred **credanonp;
181{
182	register struct inode *ip;
183	register struct netcred *np;
184	register struct ufsmount *ump = VFSTOUFS(mp);
185	struct vnode *nvp;
186	int error;
187
188	/*
189	 * Get the export permission structure for this <mp, client> tuple.
190	 */
191	np = vfs_export_lookup(mp, &ump->um_export, nam);
192	if (np == NULL)
193		return (EACCES);
194
195	error = VFS_VGET(mp, ufhp->ufid_ino, &nvp);
196	if (error) {
197		*vpp = NULLVP;
198		return (error);
199	}
200	ip = VTOI(nvp);
201	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {
202		vput(nvp);
203		*vpp = NULLVP;
204		return (ESTALE);
205	}
206	*vpp = nvp;
207	*exflagsp = np->netc_exflags;
208	*credanonp = &np->netc_anon;
209	return (0);
210}
211