kernel: mfs -- Fix unmount panic for MFS filesystems.
[dragonfly.git] / sys / kern / vfs_vfsops.c
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1/*
2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34/*
35 * Implement mp->mnt_ops function call wrappers.
36 *
37 * These wrappers are responsible for handling all MPSAFE issues related to
38 * a mount.
39 */
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/buf.h>
44#include <sys/conf.h>
45#include <sys/dirent.h>
46#include <sys/domain.h>
47#include <sys/eventhandler.h>
48#include <sys/fcntl.h>
49#include <sys/kernel.h>
50#include <sys/kthread.h>
51#include <sys/malloc.h>
52#include <sys/mbuf.h>
53#include <sys/mount.h>
54#include <sys/proc.h>
55#include <sys/namei.h>
56#include <sys/reboot.h>
57#include <sys/socket.h>
58#include <sys/stat.h>
59#include <sys/sysctl.h>
60#include <sys/syslog.h>
61#include <sys/vmmeter.h>
62#include <sys/vnode.h>
63#include <sys/vfsops.h>
64#include <sys/sysmsg.h>
65
66#include <machine/limits.h>
67
68#include <vm/vm.h>
69#include <vm/vm_object.h>
70#include <vm/vm_extern.h>
71#include <vm/vm_kern.h>
72#include <vm/pmap.h>
73#include <vm/vm_map.h>
74#include <vm/vm_page.h>
75#include <vm/vm_pager.h>
76#include <vm/vnode_pager.h>
77#include <vm/vm_zone.h>
78
79#include <sys/buf2.h>
80#include <sys/thread2.h>
81#include <sys/mplock2.h>
82
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83/*
84 * MPSAFE
85 */
86int
87vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
88{
89 VFS_MPLOCK_DECLARE;
90 int error;
91
2247fe02 92 VFS_MPLOCK1(mp);
aac0aabd 93 error = (mp->mnt_op->vfs_mount)(mp, path, data, cred);
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94 if (error == 0) {
95 /* Create per-filesystem syncer threads if requested */
96 if ((mp->mnt_flag & MNT_UPDATE) == 0 &&
97 (mp->mnt_kern_flag & MNTK_THR_SYNC))
98 vn_syncer_thr_create(mp);
99 }
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100 VFS_MPUNLOCK(mp);
101 return (error);
102}
103
104/*
105 * MPSAFE
106 */
107int
108vfs_start(struct mount *mp, int flags)
109{
110 VFS_MPLOCK_DECLARE;
111 int error;
112
7ba31c89 113 VFS_MPLOCK_FLAG(mp, MNTK_ST_MPSAFE);
aac0aabd 114 error = (mp->mnt_op->vfs_start)(mp, flags);
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115 if (error == 0)
116 /* do not call vfs_acinit on mount updates */
117 if ((mp->mnt_flag & MNT_UPDATE) == 0)
118 error = (mp->mnt_op->vfs_acinit)(mp);
aac0aabd 119 VFS_MPUNLOCK(mp);
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120 if (error == EMOUNTEXIT)
121 error = 0;
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122 return (error);
123}
124
125/*
126 * MPSAFE
127 */
128int
129vfs_unmount(struct mount *mp, int mntflags)
130{
131 VFS_MPLOCK_DECLARE;
132 int error;
133
2247fe02 134 VFS_MPLOCK1(mp);
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135 if (mp->mnt_kern_flag & MNTK_THR_SYNC)
136 vn_syncer_thr_stop(mp);
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137 error = (mp->mnt_op->vfs_acdone)(mp);
138 if (error == 0)
139 error = (mp->mnt_op->vfs_unmount)(mp, mntflags);
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140 VFS_MPUNLOCK(mp);
141 return (error);
142}
143
144/*
145 * MPSAFE
146 */
147int
148vfs_root(struct mount *mp, struct vnode **vpp)
149{
150 VFS_MPLOCK_DECLARE;
151 int error;
152
2247fe02 153 VFS_MPLOCK1(mp);
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154 error = (mp->mnt_op->vfs_root)(mp, vpp);
155 VFS_MPUNLOCK(mp);
156 return (error);
157}
158
159/*
160 * MPSAFE
161 */
162int
163vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
164 struct ucred *cred)
165{
166 VFS_MPLOCK_DECLARE;
167 int error;
168
2247fe02 169 VFS_MPLOCK1(mp);
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170 error = (mp->mnt_op->vfs_quotactl)(mp, cmds, uid, arg, cred);
171 VFS_MPUNLOCK(mp);
172 return (error);
173}
174
175/*
176 * MPSAFE
177 */
178int
179vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
180{
181 VFS_MPLOCK_DECLARE;
182 int error;
183
2247fe02 184 VFS_MPLOCK1(mp);
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185 error = (mp->mnt_op->vfs_statfs)(mp, sbp, cred);
186 VFS_MPUNLOCK(mp);
187 return (error);
188}
189
190int
191vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
192{
193 VFS_MPLOCK_DECLARE;
194 int error;
195
2247fe02 196 VFS_MPLOCK1(mp);
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197 error = (mp->mnt_op->vfs_statvfs)(mp, sbp, cred);
198 VFS_MPUNLOCK(mp);
199 return (error);
200}
201
202/*
203 * MPSAFE
204 */
205int
206vfs_sync(struct mount *mp, int waitfor)
207{
208 VFS_MPLOCK_DECLARE;
209 int error;
210
2247fe02 211 VFS_MPLOCK1(mp);
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212 error = (mp->mnt_op->vfs_sync)(mp, waitfor);
213 VFS_MPUNLOCK(mp);
214 return (error);
215}
216
217/*
218 * MPSAFE
219 */
220int
221vfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
222{
223 VFS_MPLOCK_DECLARE;
224 int error;
225
2247fe02 226 VFS_MPLOCK1(mp);
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227 error = (mp->mnt_op->vfs_vget)(mp, dvp, ino, vpp);
228 VFS_MPUNLOCK(mp);
229 return (error);
230}
231
232/*
233 * MPSAFE
234 */
235int
236vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
237 struct fid *fhp, struct vnode **vpp)
238{
239 VFS_MPLOCK_DECLARE;
240 int error;
241
2247fe02 242 VFS_MPLOCK1(mp);
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243 error = (mp->mnt_op->vfs_fhtovp)(mp, rootvp, fhp, vpp);
244 VFS_MPUNLOCK(mp);
245 return (error);
246}
247
248/*
249 * MPSAFE
250 */
251int
252vfs_checkexp(struct mount *mp, struct sockaddr *nam,
253 int *extflagsp, struct ucred **credanonp)
254{
255 VFS_MPLOCK_DECLARE;
256 int error;
257
2247fe02 258 VFS_MPLOCK1(mp);
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259 error = (mp->mnt_op->vfs_checkexp)(mp, nam, extflagsp, credanonp);
260 VFS_MPUNLOCK(mp);
261 return (error);
262}
263
264/*
265 * MPSAFE
266 */
267int
268vfs_vptofh(struct vnode *vp, struct fid *fhp)
269{
270 VFS_MPLOCK_DECLARE;
271 int error;
272
2247fe02 273 VFS_MPLOCK1(vp->v_mount);
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274 error = (vp->v_mount->mnt_op->vfs_vptofh)(vp, fhp);
275 VFS_MPUNLOCK(vp->v_mount);
276 return (error);
277}
278
279/*
280 * MPSAFE
281 */
282int
283vfs_init(struct vfsconf *vfc)
284{
285 int error;
286
287 get_mplock();
288 error = (vfc->vfc_vfsops->vfs_init)(vfc);
289 rel_mplock();
290
291 return (error);
292}
293
294/*
295 * MPSAFE
296 */
297int
298vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp)
299{
300 int error;
301
302 get_mplock();
303 error = (vfc->vfc_vfsops->vfs_uninit)(vfsp);
304 rel_mplock();
305
306 return (error);
307}
308
309/*
310 * MPSAFE
311 */
312int
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313vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
314 int attrnamespace, const char *attrname,
315 struct ucred *cred)
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316{
317 VFS_MPLOCK_DECLARE;
318 int error;
319
2247fe02 320 VFS_MPLOCK1(mp);
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321 error = (mp->mnt_op->vfs_extattrctl)(mp, cmd, vp,
322 attrnamespace, attrname,
323 cred);
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324 VFS_MPUNLOCK(mp);
325 return (error);
326}