ufs_vfsops.c revision 207736 
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 207736 2010-05-07 00:41:12Z mckusick $");
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)
70	struct mount *mp;
71	int flags;
72	struct vnode **vpp;
73{
74	struct vnode *nvp;
75	int error;
76
77	error = VFS_VGET(mp, (ino_t)ROOTINO, flags, &nvp);
78	if (error)
79		return (error);
80	*vpp = nvp;
81	return (0);
82}
83
84/*
85 * Do operations associated with quotas
86 */
87int
88ufs_quotactl(mp, cmds, id, arg)
89	struct mount *mp;
90	int cmds;
91	uid_t id;
92	void *arg;
93{
94#ifndef QUOTA
95	return (EOPNOTSUPP);
96#else
97	struct thread *td;
98	int cmd, type, error;
99
100	td = curthread;
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	switch (cmd) {
122	case Q_QUOTAON:
123		error = quotaon(td, mp, type, arg);
124		break;
125
126	case Q_QUOTAOFF:
127		error = quotaoff(td, mp, type);
128		break;
129
130	case Q_SETQUOTA32:
131		error = setquota32(td, mp, id, type, arg);
132		break;
133
134	case Q_SETUSE32:
135		error = setuse32(td, mp, id, type, arg);
136		break;
137
138	case Q_GETQUOTA32:
139		error = getquota32(td, mp, id, type, arg);
140		break;
141
142	case Q_SETQUOTA:
143		error = setquota(td, mp, id, type, arg);
144		break;
145
146	case Q_SETUSE:
147		error = setuse(td, mp, id, type, arg);
148		break;
149
150	case Q_GETQUOTA:
151		error = getquota(td, mp, id, type, arg);
152		break;
153
154	case Q_GETQUOTASIZE:
155		error = getquotasize(td, mp, id, type, arg);
156		break;
157
158	case Q_SYNC:
159		error = qsync(mp);
160		break;
161
162	default:
163		error = EINVAL;
164		break;
165	}
166	return (error);
167#endif
168}
169
170/*
171 * Initial UFS filesystems, done only once.
172 */
173int
174ufs_init(vfsp)
175	struct vfsconf *vfsp;
176{
177
178#ifdef QUOTA
179	dqinit();
180#endif
181#ifdef UFS_DIRHASH
182	ufsdirhash_init();
183#endif
184	return (0);
185}
186
187/*
188 * Uninitialise UFS filesystems, done before module unload.
189 */
190int
191ufs_uninit(vfsp)
192	struct vfsconf *vfsp;
193{
194
195#ifdef QUOTA
196	dquninit();
197#endif
198#ifdef UFS_DIRHASH
199	ufsdirhash_uninit();
200#endif
201	return (0);
202}
203
204/*
205 * This is the generic part of fhtovp called after the underlying
206 * filesystem has validated the file handle.
207 *
208 * Call the VFS_CHECKEXP beforehand to verify access.
209 */
210int
211ufs_fhtovp(mp, ufhp, vpp)
212	struct mount *mp;
213	struct ufid *ufhp;
214	struct vnode **vpp;
215{
216	struct inode *ip;
217	struct vnode *nvp;
218	int error;
219
220	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
221	if (error) {
222		*vpp = NULLVP;
223		return (error);
224	}
225	ip = VTOI(nvp);
226	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
227	    ip->i_effnlink <= 0) {
228		vput(nvp);
229		*vpp = NULLVP;
230		return (ESTALE);
231	}
232	*vpp = nvp;
233	vnode_create_vobject(*vpp, DIP(ip, i_size), curthread);
234	return (0);
235}
236