ufs_vfsops.c revision 182542 
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 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	@(#)ufs_vfsops.c	8.8 (Berkeley) 5/20/95
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/sys/ufs/ufs/ufs_vfsops.c 182542 2008-08-31 14:26:08Z attilio $");
39
40#include "opt_quota.h"
41#include "opt_ufs.h"
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/kernel.h>
46#include <sys/lock.h>
47#include <sys/malloc.h>
48#include <sys/mount.h>
49#include <sys/proc.h>
50#include <sys/socket.h>
51#include <sys/vnode.h>
52
53#include <ufs/ufs/extattr.h>
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#ifdef UFS_DIRHASH
59#include <ufs/ufs/dir.h>
60#include <ufs/ufs/dirhash.h>
61#endif
62
63MALLOC_DEFINE(M_UFSMNT, "ufs_mount", "UFS mount structure");
64
65/*
66 * Return the root of a filesystem.
67 */
68int
69ufs_root(mp, flags, vpp, td)
70	struct mount *mp;
71	int flags;
72	struct vnode **vpp;
73	struct thread *td;
74{
75	struct vnode *nvp;
76	int error;
77
78	error = VFS_VGET(mp, (ino_t)ROOTINO, flags, &nvp);
79	if (error)
80		return (error);
81	*vpp = nvp;
82	return (0);
83}
84
85/*
86 * Do operations associated with quotas
87 */
88int
89ufs_quotactl(mp, cmds, id, arg, td)
90	struct mount *mp;
91	int cmds;
92	uid_t id;
93	void *arg;
94	struct thread *td;
95{
96#ifndef QUOTA
97	return (EOPNOTSUPP);
98#else
99	int cmd, type, error;
100
101	cmd = cmds >> SUBCMDSHIFT;
102	type = cmds & SUBCMDMASK;
103	if (id == -1) {
104		switch (type) {
105
106		case USRQUOTA:
107			id = td->td_ucred->cr_ruid;
108			break;
109
110		case GRPQUOTA:
111			id = td->td_ucred->cr_rgid;
112			break;
113
114		default:
115			return (EINVAL);
116		}
117	}
118	if ((u_int)type >= MAXQUOTAS)
119		return (EINVAL);
120
121	if (vfs_busy(mp, LK_NOWAIT, 0))
122		return (0);
123
124	switch (cmd) {
125	case Q_QUOTAON:
126		error = quotaon(td, mp, type, arg);
127		break;
128
129	case Q_QUOTAOFF:
130		error = quotaoff(td, mp, type);
131		break;
132
133	case Q_SETQUOTA:
134		error = setquota(td, mp, id, type, arg);
135		break;
136
137	case Q_SETUSE:
138		error = setuse(td, mp, id, type, arg);
139		break;
140
141	case Q_GETQUOTA:
142		error = getquota(td, mp, id, type, arg);
143		break;
144
145	case Q_SYNC:
146		error = qsync(mp);
147		break;
148
149	default:
150		error = EINVAL;
151		break;
152	}
153	vfs_unbusy(mp);
154	return (error);
155#endif
156}
157
158/*
159 * Initial UFS filesystems, done only once.
160 */
161int
162ufs_init(vfsp)
163	struct vfsconf *vfsp;
164{
165
166#ifdef QUOTA
167	dqinit();
168#endif
169#ifdef UFS_DIRHASH
170	ufsdirhash_init();
171#endif
172	return (0);
173}
174
175/*
176 * Uninitialise UFS filesystems, done before module unload.
177 */
178int
179ufs_uninit(vfsp)
180	struct vfsconf *vfsp;
181{
182
183#ifdef QUOTA
184	dquninit();
185#endif
186#ifdef UFS_DIRHASH
187	ufsdirhash_uninit();
188#endif
189	return (0);
190}
191
192/*
193 * This is the generic part of fhtovp called after the underlying
194 * filesystem has validated the file handle.
195 *
196 * Call the VFS_CHECKEXP beforehand to verify access.
197 */
198int
199ufs_fhtovp(mp, ufhp, vpp)
200	struct mount *mp;
201	struct ufid *ufhp;
202	struct vnode **vpp;
203{
204	struct inode *ip;
205	struct vnode *nvp;
206	int error;
207
208	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
209	if (error) {
210		*vpp = NULLVP;
211		return (error);
212	}
213	ip = VTOI(nvp);
214	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
215	    ip->i_effnlink <= 0) {
216		vput(nvp);
217		*vpp = NULLVP;
218		return (ESTALE);
219	}
220	*vpp = nvp;
221	vnode_create_vobject(*vpp, DIP(ip, i_size), curthread);
222	return (0);
223}
224