ufs_vfsops.c revision 302408 
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: stable/11/sys/ufs/ufs/ufs_vfsops.c 277794 2015-01-27 10:32:49Z kib $");
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	if ((cmds >> SUBCMDSHIFT) == Q_QUOTAON)
96		vfs_unbusy(mp);
97
98	return (EOPNOTSUPP);
99#else
100	struct thread *td;
101	int cmd, type, error;
102
103	td = curthread;
104	cmd = cmds >> SUBCMDSHIFT;
105	type = cmds & SUBCMDMASK;
106	if (id == -1) {
107		switch (type) {
108
109		case USRQUOTA:
110			id = td->td_ucred->cr_ruid;
111			break;
112
113		case GRPQUOTA:
114			id = td->td_ucred->cr_rgid;
115			break;
116
117		default:
118			if (cmd == Q_QUOTAON)
119				vfs_unbusy(mp);
120			return (EINVAL);
121		}
122	}
123	if ((u_int)type >= MAXQUOTAS) {
124		if (cmd == Q_QUOTAON)
125			vfs_unbusy(mp);
126		return (EINVAL);
127	}
128
129	switch (cmd) {
130	case Q_QUOTAON:
131		error = quotaon(td, mp, type, arg);
132		break;
133
134	case Q_QUOTAOFF:
135		error = quotaoff(td, mp, type);
136		break;
137
138	case Q_SETQUOTA32:
139		error = setquota32(td, mp, id, type, arg);
140		break;
141
142	case Q_SETUSE32:
143		error = setuse32(td, mp, id, type, arg);
144		break;
145
146	case Q_GETQUOTA32:
147		error = getquota32(td, mp, id, type, arg);
148		break;
149
150	case Q_SETQUOTA:
151		error = setquota(td, mp, id, type, arg);
152		break;
153
154	case Q_SETUSE:
155		error = setuse(td, mp, id, type, arg);
156		break;
157
158	case Q_GETQUOTA:
159		error = getquota(td, mp, id, type, arg);
160		break;
161
162	case Q_GETQUOTASIZE:
163		error = getquotasize(td, mp, id, type, arg);
164		break;
165
166	case Q_SYNC:
167		error = qsync(mp);
168		break;
169
170	default:
171		error = EINVAL;
172		break;
173	}
174	return (error);
175#endif
176}
177
178/*
179 * Initial UFS filesystems, done only once.
180 */
181int
182ufs_init(vfsp)
183	struct vfsconf *vfsp;
184{
185
186#ifdef QUOTA
187	dqinit();
188#endif
189#ifdef UFS_DIRHASH
190	ufsdirhash_init();
191#endif
192	return (0);
193}
194
195/*
196 * Uninitialise UFS filesystems, done before module unload.
197 */
198int
199ufs_uninit(vfsp)
200	struct vfsconf *vfsp;
201{
202
203#ifdef QUOTA
204	dquninit();
205#endif
206#ifdef UFS_DIRHASH
207	ufsdirhash_uninit();
208#endif
209	return (0);
210}
211
212/*
213 * This is the generic part of fhtovp called after the underlying
214 * filesystem has validated the file handle.
215 *
216 * Call the VFS_CHECKEXP beforehand to verify access.
217 */
218int
219ufs_fhtovp(mp, ufhp, flags, vpp)
220	struct mount *mp;
221	struct ufid *ufhp;
222	int flags;
223	struct vnode **vpp;
224{
225	struct inode *ip;
226	struct vnode *nvp;
227	int error;
228
229	error = VFS_VGET(mp, ufhp->ufid_ino, flags, &nvp);
230	if (error) {
231		*vpp = NULLVP;
232		return (error);
233	}
234	ip = VTOI(nvp);
235	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
236	    ip->i_effnlink <= 0) {
237		vput(nvp);
238		*vpp = NULLVP;
239		return (ESTALE);
240	}
241	*vpp = nvp;
242	vnode_create_vobject(*vpp, DIP(ip, i_size), curthread);
243	return (0);
244}
245