ufs_vfsops.c revision 21673 
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 * $FreeBSD: head/sys/ufs/ufs/ufs_vfsops.c 21673 1997-01-14 07:20:47Z jkh $
40 */
41
42#include "opt_quota.h"
43
44#include <sys/param.h>
45#include <sys/mbuf.h>
46#include <sys/mount.h>
47#include <sys/proc.h>
48#include <sys/buf.h>
49#include <sys/vnode.h>
50#include <sys/malloc.h>
51
52#include <miscfs/specfs/specdev.h>
53
54#include <ufs/ufs/quota.h>
55#include <ufs/ufs/inode.h>
56#include <ufs/ufs/ufsmount.h>
57#include <ufs/ufs/ufs_extern.h>
58
59/*
60 * Flag to permit forcible unmounting.
61 */
62int doforce = 1;
63
64/*
65 * Make a filesystem operational.
66 * Nothing to do at the moment.
67 */
68/* ARGSUSED */
69int
70ufs_start(mp, flags, p)
71	struct mount *mp;
72	int flags;
73	struct proc *p;
74{
75
76	return (0);
77}
78
79/*
80 * Return the root of a filesystem.
81 */
82int
83ufs_root(mp, vpp)
84	struct mount *mp;
85	struct vnode **vpp;
86{
87	struct vnode *nvp;
88	int error;
89
90	error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp);
91	if (error)
92		return (error);
93	*vpp = nvp;
94	return (0);
95}
96
97/*
98 * Do operations associated with quotas
99 */
100int
101ufs_quotactl(mp, cmds, uid, arg, p)
102	struct mount *mp;
103	int cmds;
104	uid_t uid;
105	caddr_t arg;
106	struct proc *p;
107{
108#ifndef QUOTA
109	return (EOPNOTSUPP);
110#else
111	int cmd, type, error;
112
113	if (uid == -1)
114		uid = p->p_cred->p_ruid;
115	cmd = cmds >> SUBCMDSHIFT;
116
117	switch (cmd) {
118	case Q_SYNC:
119		break;
120	case Q_GETQUOTA:
121		if (uid == p->p_cred->p_ruid)
122			break;
123		/* fall through */
124	default:
125		if (error = suser(p->p_ucred, &p->p_acflag))
126			return (error);
127	}
128
129	type = cmds & SUBCMDMASK;
130	if ((u_int)type >= MAXQUOTAS)
131		return (EINVAL);
132
133	switch (cmd) {
134
135	case Q_QUOTAON:
136		return (quotaon(p, mp, type, arg));
137
138	case Q_QUOTAOFF:
139		if (vfs_busy(mp))
140			return (0);
141		error = quotaoff(p, mp, type);
142		vfs_unbusy(mp);
143		return (error);
144
145	case Q_SETQUOTA:
146		return (setquota(mp, uid, type, arg));
147
148	case Q_SETUSE:
149		return (setuse(mp, uid, type, arg));
150
151	case Q_GETQUOTA:
152		return (getquota(mp, uid, type, arg));
153
154	case Q_SYNC:
155		if (vfs_busy(mp))
156			return (0);
157		error = qsync(mp);
158		vfs_unbusy(mp);
159		return (error);
160
161	default:
162		return (EINVAL);
163	}
164	/* NOTREACHED */
165#endif
166}
167
168/*
169 * This is the generic part of fhtovp called after the underlying
170 * filesystem has validated the file handle.
171 *
172 * Verify that a host should have access to a filesystem, and if so
173 * return a vnode for the presented file handle.
174 */
175int
176ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)
177	register struct mount *mp;
178	struct ufid *ufhp;
179	struct mbuf *nam;
180	struct vnode **vpp;
181	int *exflagsp;
182	struct ucred **credanonp;
183{
184	register struct inode *ip;
185	register struct netcred *np;
186	register struct ufsmount *ump = VFSTOUFS(mp);
187	struct vnode *nvp;
188	int error;
189
190	/*
191	 * Get the export permission structure for this <mp, client> tuple.
192	 */
193	np = vfs_export_lookup(mp, &ump->um_export, nam);
194	if (np == NULL)
195		return (EACCES);
196
197	error = VFS_VGET(mp, ufhp->ufid_ino, &nvp);
198	if (error) {
199		*vpp = NULLVP;
200		return (error);
201	}
202	ip = VTOI(nvp);
203	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {
204		vput(nvp);
205		*vpp = NULLVP;
206		return (ESTALE);
207	}
208	*vpp = nvp;
209	*exflagsp = np->netc_exflags;
210	*credanonp = &np->netc_anon;
211	return (0);
212}
213