ufs_vfsops.c revision 1542 
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 */
40
41#include <sys/param.h>
42#include <sys/mbuf.h>
43#include <sys/mount.h>
44#include <sys/proc.h>
45#include <sys/buf.h>
46#include <sys/vnode.h>
47#include <sys/malloc.h>
48
49#include <miscfs/specfs/specdev.h>
50
51#include <ufs/ufs/quota.h>
52#include <ufs/ufs/inode.h>
53#include <ufs/ufs/ufsmount.h>
54#include <ufs/ufs/ufs_extern.h>
55
56/*
57 * Flag to permit forcible unmounting.
58 */
59int doforce = 1;
60
61/*
62 * Make a filesystem operational.
63 * Nothing to do at the moment.
64 */
65/* ARGSUSED */
66int
67ufs_start(mp, flags, p)
68	struct mount *mp;
69	int flags;
70	struct proc *p;
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	if (error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp))
88		return (error);
89	*vpp = nvp;
90	return (0);
91}
92
93/*
94 * Do operations associated with quotas
95 */
96int
97ufs_quotactl(mp, cmds, uid, arg, p)
98	struct mount *mp;
99	int cmds;
100	uid_t uid;
101	caddr_t arg;
102	struct proc *p;
103{
104	int cmd, type, error;
105
106#ifndef QUOTA
107	return (EOPNOTSUPP);
108#else
109	if (uid == -1)
110		uid = p->p_cred->p_ruid;
111	cmd = cmds >> SUBCMDSHIFT;
112
113	switch (cmd) {
114	case Q_GETQUOTA:
115	case Q_SYNC:
116		if (uid == p->p_cred->p_ruid)
117			break;
118		/* fall through */
119	default:
120		if (error = suser(p->p_ucred, &p->p_acflag))
121			return (error);
122	}
123
124	type = cmd & SUBCMDMASK;
125	if ((u_int)type >= MAXQUOTAS)
126		return (EINVAL);
127
128	switch (cmd) {
129
130	case Q_QUOTAON:
131		return (quotaon(p, mp, type, arg));
132
133	case Q_QUOTAOFF:
134		if (vfs_busy(mp))
135			return (0);
136		error = quotaoff(p, mp, type);
137		vfs_unbusy(mp);
138		return (error);
139
140	case Q_SETQUOTA:
141		return (setquota(mp, uid, type, arg));
142
143	case Q_SETUSE:
144		return (setuse(mp, uid, type, arg));
145
146	case Q_GETQUOTA:
147		return (getquota(mp, uid, type, arg));
148
149	case Q_SYNC:
150		if (vfs_busy(mp))
151			return (0);
152		error = qsync(mp);
153		vfs_unbusy(mp);
154		return (error);
155
156	default:
157		return (EINVAL);
158	}
159	/* NOTREACHED */
160#endif
161}
162
163/*
164 * This is the generic part of fhtovp called after the underlying
165 * filesystem has validated the file handle.
166 *
167 * Verify that a host should have access to a filesystem, and if so
168 * return a vnode for the presented file handle.
169 */
170int
171ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)
172	register struct mount *mp;
173	struct ufid *ufhp;
174	struct mbuf *nam;
175	struct vnode **vpp;
176	int *exflagsp;
177	struct ucred **credanonp;
178{
179	register struct inode *ip;
180	register struct netcred *np;
181	register struct ufsmount *ump = VFSTOUFS(mp);
182	struct vnode *nvp;
183	int error;
184
185	/*
186	 * Get the export permission structure for this <mp, client> tuple.
187	 */
188	np = vfs_export_lookup(mp, &ump->um_export, nam);
189	if (np == NULL)
190		return (EACCES);
191
192	if (error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) {
193		*vpp = NULLVP;
194		return (error);
195	}
196	ip = VTOI(nvp);
197	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {
198		vput(nvp);
199		*vpp = NULLVP;
200		return (ESTALE);
201	}
202	*vpp = nvp;
203	*exflagsp = np->netc_exflags;
204	*credanonp = &np->netc_anon;
205	return (0);
206}
207