ufs_vfsops.c revision 151897 
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 151897 2005-10-31 15:41:29Z rwatson $");
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, uid, arg, td)
90	struct mount *mp;
91	int cmds;
92	uid_t uid;
93	caddr_t arg;
94	struct thread *td;
95{
96#ifndef QUOTA
97	return (EOPNOTSUPP);
98#else
99	int cmd, type, error;
100
101	if (uid == -1)
102		uid = td->td_ucred->cr_ruid;
103	cmd = cmds >> SUBCMDSHIFT;
104	type = cmds & SUBCMDMASK;
105	if ((u_int)type >= MAXQUOTAS)
106		return (EINVAL);
107
108	if (vfs_busy(mp, LK_NOWAIT, 0, td))
109		return (0);
110
111	switch (cmd) {
112	case Q_QUOTAON:
113		error = quotaon(td, mp, type, arg);
114		break;
115
116	case Q_QUOTAOFF:
117		error = quotaoff(td, mp, type);
118		break;
119
120	case Q_SETQUOTA:
121		error = setquota(td, mp, uid, type, arg);
122		break;
123
124	case Q_SETUSE:
125		error = setuse(td, mp, uid, type, arg);
126		break;
127
128	case Q_GETQUOTA:
129		error = getquota(td, mp, uid, type, arg);
130		break;
131
132	case Q_SYNC:
133		error = qsync(mp);
134		break;
135
136	default:
137		error = EINVAL;
138		break;
139	}
140	vfs_unbusy(mp, td);
141	return (error);
142#endif
143}
144
145/*
146 * Initial UFS filesystems, done only once.
147 */
148int
149ufs_init(vfsp)
150	struct vfsconf *vfsp;
151{
152
153#ifdef QUOTA
154	dqinit();
155#endif
156#ifdef UFS_DIRHASH
157	ufsdirhash_init();
158#endif
159	return (0);
160}
161
162/*
163 * Uninitialise UFS filesystems, done before module unload.
164 */
165int
166ufs_uninit(vfsp)
167	struct vfsconf *vfsp;
168{
169
170#ifdef QUOTA
171	dquninit();
172#endif
173#ifdef UFS_DIRHASH
174	ufsdirhash_uninit();
175#endif
176	return (0);
177}
178
179/*
180 * This is the generic part of fhtovp called after the underlying
181 * filesystem has validated the file handle.
182 *
183 * Call the VFS_CHECKEXP beforehand to verify access.
184 */
185int
186ufs_fhtovp(mp, ufhp, vpp)
187	struct mount *mp;
188	struct ufid *ufhp;
189	struct vnode **vpp;
190{
191	struct inode *ip;
192	struct vnode *nvp;
193	int error;
194
195	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
196	if (error) {
197		*vpp = NULLVP;
198		return (error);
199	}
200	ip = VTOI(nvp);
201	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
202	    ip->i_effnlink <= 0) {
203		vput(nvp);
204		*vpp = NULLVP;
205		return (ESTALE);
206	}
207	*vpp = nvp;
208	vnode_create_vobject(*vpp, DIP(ip, i_size), curthread);
209	return (0);
210}
211