ufs_vfsops.c revision 30354 
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 * $Id: ufs_vfsops.c,v 1.10 1997/08/16 19:16:27 wollman Exp $
40 */
41
42#include "opt_quota.h"
43
44#include <sys/param.h>
45#include <sys/mount.h>
46#include <sys/proc.h>
47#include <sys/malloc.h>
48#include <sys/vnode.h>
49
50#include <ufs/ufs/quota.h>
51#include <ufs/ufs/inode.h>
52#include <ufs/ufs/ufsmount.h>
53#include <ufs/ufs/ufs_extern.h>
54
55MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure");
56/*
57 * Make a filesystem operational.
58 * Nothing to do at the moment.
59 */
60/* ARGSUSED */
61int
62ufs_start(mp, flags, p)
63	struct mount *mp;
64	int flags;
65	struct proc *p;
66{
67
68	return (0);
69}
70
71/*
72 * Return the root of a filesystem.
73 */
74int
75ufs_root(mp, vpp)
76	struct mount *mp;
77	struct vnode **vpp;
78{
79	struct vnode *nvp;
80	int error;
81
82	error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp);
83	if (error)
84		return (error);
85	*vpp = nvp;
86	return (0);
87}
88
89/*
90 * Do operations associated with quotas
91 */
92int
93ufs_quotactl(mp, cmds, uid, arg, p)
94	struct mount *mp;
95	int cmds;
96	uid_t uid;
97	caddr_t arg;
98	struct proc *p;
99{
100#ifndef QUOTA
101	return (EOPNOTSUPP);
102#else
103	int cmd, type, error;
104
105	if (uid == -1)
106		uid = p->p_cred->p_ruid;
107	cmd = cmds >> SUBCMDSHIFT;
108
109	switch (cmd) {
110	case Q_SYNC:
111		break;
112	case Q_GETQUOTA:
113		if (uid == p->p_cred->p_ruid)
114			break;
115		/* fall through */
116	default:
117		if (error = suser(p->p_ucred, &p->p_acflag))
118			return (error);
119	}
120
121	type = cmds & SUBCMDMASK;
122	if ((u_int)type >= MAXQUOTAS)
123		return (EINVAL);
124	if (vfs_busy(mp, LK_NOWAIT, 0, p))
125		return (0);
126
127	switch (cmd) {
128
129	case Q_QUOTAON:
130		error = quotaon(p, mp, type, arg);
131		break;
132
133	case Q_QUOTAOFF:
134		error = quotaoff(p, mp, type);
135		break;
136
137	case Q_SETQUOTA:
138		error = setquota(mp, uid, type, arg);
139		break;
140
141	case Q_SETUSE:
142		error = setuse(mp, uid, type, arg);
143		break;
144
145	case Q_GETQUOTA:
146		error = getquota(mp, uid, type, arg);
147		break;
148
149	case Q_SYNC:
150		error = qsync(mp);
151		break;
152
153	default:
154		error = EINVAL;
155		break;
156	}
157	vfs_unbusy(mp, p);
158	return (error);
159#endif
160}
161
162/*
163 * Initial UFS filesystems, done only once.
164 */
165int
166ufs_init(vfsp)
167	struct vfsconf *vfsp;
168{
169	static int done;
170
171	if (done)
172		return (0);
173	done = 1;
174	ufs_ihashinit();
175#ifdef QUOTA
176	dqinit();
177#endif
178	return (0);
179}
180
181/*
182 * This is the generic part of fhtovp called after the underlying
183 * filesystem has validated the file handle.
184 *
185 * Verify that a host should have access to a filesystem, and if so
186 * return a vnode for the presented file handle.
187 */
188int
189ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)
190	register struct mount *mp;
191	struct ufid *ufhp;
192	struct sockaddr *nam;
193	struct vnode **vpp;
194	int *exflagsp;
195	struct ucred **credanonp;
196{
197	register struct inode *ip;
198	register struct netcred *np;
199	register struct ufsmount *ump = VFSTOUFS(mp);
200	struct vnode *nvp;
201	int error;
202
203	/*
204	 * Get the export permission structure for this <mp, client> tuple.
205	 */
206	np = vfs_export_lookup(mp, &ump->um_export, nam);
207	if (np == NULL)
208		return (EACCES);
209
210	error = VFS_VGET(mp, ufhp->ufid_ino, &nvp);
211	if (error) {
212		*vpp = NULLVP;
213		return (error);
214	}
215	ip = VTOI(nvp);
216	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {
217		vput(nvp);
218		*vpp = NULLVP;
219		return (ESTALE);
220	}
221	*vpp = nvp;
222	*exflagsp = np->netc_exflags;
223	*credanonp = &np->netc_anon;
224	return (0);
225}
226