ufs_vfsops.c revision 143562 
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 143562 2005-03-14 10:21:16Z phk $");
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, vpp, td)
70	struct mount *mp;
71	struct vnode **vpp;
72	struct thread *td;
73{
74	struct vnode *nvp;
75	int error;
76
77	error = VFS_VGET(mp, (ino_t)ROOTINO, LK_EXCLUSIVE, &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, uid, arg, td)
89	struct mount *mp;
90	int cmds;
91	uid_t uid;
92	caddr_t arg;
93	struct thread *td;
94{
95#ifndef QUOTA
96	return (EOPNOTSUPP);
97#else
98	int cmd, type, error;
99
100	if (uid == -1)
101		uid = td->td_ucred->cr_ruid;
102	cmd = cmds >> SUBCMDSHIFT;
103	type = cmds & SUBCMDMASK;
104	if ((u_int)type >= MAXQUOTAS)
105		return (EINVAL);
106
107	if (vfs_busy(mp, LK_NOWAIT, 0, td))
108		return (0);
109
110	switch (cmd) {
111	case Q_QUOTAON:
112		error = quotaon(td, mp, type, arg);
113		break;
114
115	case Q_QUOTAOFF:
116		error = quotaoff(td, mp, type);
117		break;
118
119	case Q_SETQUOTA:
120		error = setquota(td, mp, uid, type, arg);
121		break;
122
123	case Q_SETUSE:
124		error = setuse(td, mp, uid, type, arg);
125		break;
126
127	case Q_GETQUOTA:
128		error = getquota(td, mp, uid, type, arg);
129		break;
130
131	case Q_SYNC:
132		error = qsync(mp);
133		break;
134
135	default:
136		error = EINVAL;
137		break;
138	}
139	vfs_unbusy(mp, td);
140	return (error);
141#endif
142}
143
144/*
145 * Initial UFS filesystems, done only once.
146 */
147int
148ufs_init(vfsp)
149	struct vfsconf *vfsp;
150{
151
152#ifdef QUOTA
153	dqinit();
154#endif
155#ifdef UFS_DIRHASH
156	ufsdirhash_init();
157#endif
158	return (0);
159}
160
161/*
162 * Uninitialise UFS filesystems, done before module unload.
163 */
164int
165ufs_uninit(vfsp)
166	struct vfsconf *vfsp;
167{
168
169#ifdef QUOTA
170	dquninit();
171#endif
172#ifdef UFS_DIRHASH
173	ufsdirhash_uninit();
174#endif
175	return (0);
176}
177
178/*
179 * This is the generic part of fhtovp called after the underlying
180 * filesystem has validated the file handle.
181 *
182 * Call the VFS_CHECKEXP beforehand to verify access.
183 */
184int
185ufs_fhtovp(mp, ufhp, vpp)
186	struct mount *mp;
187	struct ufid *ufhp;
188	struct vnode **vpp;
189{
190	struct inode *ip;
191	struct vnode *nvp;
192	int error;
193
194	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
195	if (error) {
196		*vpp = NULLVP;
197		return (error);
198	}
199	ip = VTOI(nvp);
200	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
201	    ip->i_effnlink <= 0) {
202		vput(nvp);
203		*vpp = NULLVP;
204		return (ESTALE);
205	}
206	*vpp = nvp;
207	vnode_create_vobject(*vpp, DIP(ip, i_size), curthread);
208	return (0);
209}
210