summaryrefslogtreecommitdiffstats
path: root/drivers/usb/core/inode.c
blob: 3cf945cc5b9ae1298fcc5fb7ad472a452f758c5f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
/*****************************************************************************/

/*
 *	inode.c  --  Inode/Dentry functions for the USB device file system.
 *
 *	Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
 *	Copyright (C) 2001,2002,2004 Greg Kroah-Hartman (greg@kroah.com)
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  History:
 *   0.1  04.01.2000  Created
 *   0.2  10.12.2001  converted to use the vfs layer better
 */

/*****************************************************************************/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/usb.h>
#include <linux/namei.h>
#include <linux/usbdevice_fs.h>
#include <linux/smp_lock.h>
#include <linux/parser.h>
#include <linux/notifier.h>
#include <asm/byteorder.h>
#include "usb.h"
#include "hcd.h"

static struct super_operations usbfs_ops;
static struct file_operations default_file_operations;
static struct vfsmount *usbfs_mount;
static int usbfs_mount_count;	/* = 0 */
static int ignore_mount = 0;

static struct dentry *devices_usbfs_dentry;
static int num_buses;	/* = 0 */

static uid_t devuid;	/* = 0 */
static uid_t busuid;	/* = 0 */
static uid_t listuid;	/* = 0 */
static gid_t devgid;	/* = 0 */
static gid_t busgid;	/* = 0 */
static gid_t listgid;	/* = 0 */
static umode_t devmode = S_IWUSR | S_IRUGO;
static umode_t busmode = S_IXUGO | S_IRUGO;
static umode_t listmode = S_IRUGO;

enum {
	Opt_devuid, Opt_devgid, Opt_devmode,
	Opt_busuid, Opt_busgid, Opt_busmode,
	Opt_listuid, Opt_listgid, Opt_listmode,
	Opt_err,
};

static match_table_t tokens = {
	{Opt_devuid, "devuid=%u"},
	{Opt_devgid, "devgid=%u"},
	{Opt_devmode, "devmode=%o"},
	{Opt_busuid, "busuid=%u"},
	{Opt_busgid, "busgid=%u"},
	{Opt_busmode, "busmode=%o"},
	{Opt_listuid, "listuid=%u"},
	{Opt_listgid, "listgid=%u"},
	{Opt_listmode, "listmode=%o"},
	{Opt_err, NULL}
};

static int parse_options(struct super_block *s, char *data)
{
	char *p;
	int option;

	/* (re)set to defaults. */
	devuid = 0;
	busuid = 0;
	listuid = 0;
	devgid = 0;
	busgid = 0;
	listgid = 0;
	devmode = S_IWUSR | S_IRUGO;
	busmode = S_IXUGO | S_IRUGO;
	listmode = S_IRUGO;

	while ((p = strsep(&data, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_devuid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			devuid = option;
			break;
		case Opt_devgid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			devgid = option;
			break;
		case Opt_devmode:
			if (match_octal(&args[0], &option))
				return -EINVAL;
			devmode = option & S_IRWXUGO;
			break;
		case Opt_busuid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			busuid = option;
			break;
		case Opt_busgid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			busgid = option;
			break;
		case Opt_busmode:
			if (match_octal(&args[0], &option))
				return -EINVAL;
			busmode = option & S_IRWXUGO;
			break;
		case Opt_listuid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			listuid = option;
			break;
		case Opt_listgid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			listgid = option;
			break;
		case Opt_listmode:
			if (match_octal(&args[0], &option))
				return -EINVAL;
			listmode = option & S_IRWXUGO;
			break;
		default:
			err("usbfs: unrecognised mount option \"%s\" "
			    "or missing value\n", p);
			return -EINVAL;
		}
	}

	return 0;
}

static void update_special(struct dentry *special)
{
	special->d_inode->i_uid = listuid;
	special->d_inode->i_gid = listgid;
	special->d_inode->i_mode = S_IFREG | listmode;
}

static void update_dev(struct dentry *dev)
{
	dev->d_inode->i_uid = devuid;
	dev->d_inode->i_gid = devgid;
	dev->d_inode->i_mode = S_IFREG | devmode;
}

static void update_bus(struct dentry *bus)
{
	struct dentry *dev = NULL;

	bus->d_inode->i_uid = busuid;
	bus->d_inode->i_gid = busgid;
	bus->d_inode->i_mode = S_IFDIR | busmode;

	mutex_lock(&bus->d_inode->i_mutex);

	list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child)
		if (dev->d_inode)
			update_dev(dev);

	mutex_unlock(&bus->d_inode->i_mutex);
}

static void update_sb(struct super_block *sb)
{
	struct dentry *root = sb->s_root;
	struct dentry *bus = NULL;

	if (!root)
		return;

	mutex_lock(&root->d_inode->i_mutex);

	list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
		if (bus->d_inode) {
			switch (S_IFMT & bus->d_inode->i_mode) {
			case S_IFDIR:
				update_bus(bus);
				break;
			case S_IFREG:
				update_special(bus);
				break;
			default:
				warn("Unknown node %s mode %x found on remount!\n",bus->d_name.name,bus->d_inode->i_mode);
				break;
			}
		}
	}

	mutex_unlock(&root->d_inode->i_mutex);
}

static int remount(struct super_block *sb, int *flags, char *data)
{
	/* If this is not a real mount,
	 * i.e. it's a simple_pin_fs from create_special_files,
	 * then ignore it.
	 */
	if (ignore_mount)
		return 0;

	if (parse_options(sb, data)) {
		warn("usbfs: mount parameter error:");
		return -EINVAL;
	}

	if (usbfs_mount && usbfs_mount->mnt_sb)
		update_sb(usbfs_mount->mnt_sb);

	return 0;
}

static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t dev)
{
	struct inode *inode = new_inode(sb);

	if (inode) {
		inode->i_mode = mode;
		inode->i_uid = current->fsuid;
		inode->i_gid = current->fsgid;
		inode->i_blksize = PAGE_CACHE_SIZE;
		inode->i_blocks = 0;
		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		switch (mode & S_IFMT) {
		default:
			init_special_inode(inode, mode, dev);
			break;
		case S_IFREG:
			inode->i_fop = &default_file_operations;
			break;
		case S_IFDIR:
			inode->i_op = &simple_dir_inode_operations;
			inode->i_fop = &simple_dir_operations;

			/* directory inodes start off with i_nlink == 2 (for "." entry) */
			inode->i_nlink++;
			break;
		}
	}
	return inode; 
}

/* SMP-safe */
static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode,
			dev_t dev)
{
	struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev);
	int error = -EPERM;

	if (dentry->d_inode)
		return -EEXIST;

	if (inode) {
		d_instantiate(dentry, inode);
		dget(dentry);
		error = 0;
	}
	return error;
}

static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode)
{
	int res;

	mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
	res = usbfs_mknod (dir, dentry, mode, 0);
	if (!res)
		dir->i_nlink++;
	return res;
}

static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode)
{
	mode = (mode & S_IALLUGO) | S_IFREG;
	return usbfs_mknod (dir, dentry, mode, 0);
}

static inline int usbfs_positive (struct dentry *dentry)
{
	return dentry->d_inode && !d_unhashed(dentry);
}

static int usbfs_empty (struct dentry *dentry)
{
	struct list_head *list;

	spin_lock(&dcache_lock);

	list_for_each(list, &dentry->d_subdirs) {
		struct dentry *de = list_entry(list, struct dentry, d_u.d_child);
		if (usbfs_positive(de)) {
			spin_unlock(&dcache_lock);
			return 0;
		}
	}

	spin_unlock(&dcache_lock);
	return 1;
}

static int usbfs_unlink (struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	mutex_lock(&inode->i_mutex);
	dentry->d_inode->i_nlink--;
	dput(dentry);
	mutex_unlock(&inode->i_mutex);
	d_delete(dentry);
	return 0;
}

static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	int error = -ENOTEMPTY;
	struct inode * inode = dentry->d_inode;

	mutex_lock(&inode->i_mutex);
	dentry_unhash(dentry);
	if (usbfs_empty(dentry)) {
		dentry->d_inode->i_nlink -= 2;
		dput(dentry);
		inode->i_flags |= S_DEAD;
		dir->i_nlink--;
		error = 0;
	}
	mutex_unlock(&inode->i_mutex);
	if (!error)
		d_delete(dentry);
	dput(dentry);
	return error;
}


/* default file operations */
static ssize_t default_read_file (struct file *file, char __user *buf,
				  size_t count, loff_t *ppos)
{
	return 0;
}

static ssize_t default_write_file (struct file *file, const char __user *buf,
				   size_t count, loff_t *ppos)
{
	return count;
}

static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
{
	loff_t retval = -EINVAL;

	mutex_lock(&file->f_dentry->d_inode->i_mutex);
	switch(orig) {
	case 0:
		if (offset > 0) {
			file->f_pos = offset;
			retval = file->f_pos;
		} 
		break;
	case 1:
		if ((offset + file->f_pos) > 0) {
			file->f_pos += offset;
			retval = file->f_pos;
		} 
		break;
	default:
		break;
	}
	mutex_unlock(&file->f_dentry->d_inode->i_mutex);
	return retval;
}

static int default_open (struct inode *inode, struct file *file)
{
	if (inode->u.generic_ip)
		file->private_data = inode->u.generic_ip;

	return 0;
}

static struct file_operations default_file_operations = {
	.read =		default_read_file,
	.write =	default_write_file,
	.open =		default_open,
	.llseek =	default_file_lseek,
};

static struct super_operations usbfs_ops = {
	.statfs =	simple_statfs,
	.drop_inode =	generic_delete_inode,
	.remount_fs =	remount,
};

static int usbfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct inode *inode;
	struct dentry *root;

	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	sb->s_magic = USBDEVICE_SUPER_MAGIC;
	sb->s_op = &usbfs_ops;
	sb->s_time_gran = 1;
	inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0);

	if (!inode) {
		dbg("%s: could not get inode!",__FUNCTION__);
		return -ENOMEM;
	}

	root = d_alloc_root(inode);
	if (!root) {
		dbg("%s: could not get root dentry!",__FUNCTION__);
		iput(inode);
		return -ENOMEM;
	}
	sb->s_root = root;
	return 0;
}

/*
 * fs_create_by_name - create a file, given a name
 * @name:	name of file
 * @mode:	type of file
 * @parent:	dentry of directory to create it in
 * @dentry:	resulting dentry of file
 *
 * This function handles both regular files and directories.
 */
static int fs_create_by_name (const char *name, mode_t mode,
			      struct dentry *parent, struct dentry **dentry)
{
	int error = 0;

	/* If the parent is not specified, we create it in the root.
	 * We need the root dentry to do this, which is in the super 
	 * block. A pointer to that is in the struct vfsmount that we
	 * have around.
	 */
	if (!parent ) {
		if (usbfs_mount && usbfs_mount->mnt_sb) {
			parent = usbfs_mount->mnt_sb->s_root;
		}
	}

	if (!parent) {
		dbg("Ah! can not find a parent!");
		return -EFAULT;
	}

	*dentry = NULL;
	mutex_lock(&parent->d_inode->i_mutex);
	*dentry = lookup_one_len(name, parent, strlen(name));
	if (!IS_ERR(dentry)) {
		if ((mode & S_IFMT) == S_IFDIR)
			error = usbfs_mkdir (parent->d_inode, *dentry, mode);
		else 
			error = usbfs_create (parent->d_inode, *dentry, mode);
	} else
		error = PTR_ERR(dentry);
	mutex_unlock(&parent->d_inode->i_mutex);

	return error;
}

static struct dentry *fs_create_file (const char *name, mode_t mode,
				      struct dentry *parent, void *data,
				      struct file_operations *fops,
				      uid_t uid, gid_t gid)
{
	struct dentry *dentry;
	int error;

	dbg("creating file '%s'",name);

	error = fs_create_by_name (name, mode, parent, &dentry);
	if (error) {
		dentry = NULL;
	} else {
		if (dentry->d_inode) {
			if (data)
				dentry->d_inode->u.generic_ip = data;
			if (fops)
				dentry->d_inode->i_fop = fops;
			dentry->d_inode->i_uid = uid;
			dentry->d_inode->i_gid = gid;
		}
	}

	return dentry;
}

static void fs_remove_file (struct dentry *dentry)
{
	struct dentry *parent = dentry->d_parent;
	
	if (!parent || !parent->d_inode)
		return;

	mutex_lock(&parent->d_inode->i_mutex);
	if (usbfs_positive(dentry)) {
		if (dentry->d_inode) {
			if (S_ISDIR(dentry->d_inode->i_mode))
				usbfs_rmdir(parent->d_inode, dentry);
			else
				usbfs_unlink(parent->d_inode, dentry);
		dput(dentry);
		}
	}
	mutex_unlock(&parent->d_inode->i_mutex);
}

/* --------------------------------------------------------------------- */

static struct super_block *usb_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return get_sb_single(fs_type, flags, data, usbfs_fill_super);
}

static struct file_system_type usb_fs_type = {
	.owner =	THIS_MODULE,
	.name =		"usbfs",
	.get_sb =	usb_get_sb,
	.kill_sb =	kill_litter_super,
};

/* --------------------------------------------------------------------- */

static int create_special_files (void)
{
	struct dentry *parent;
	int retval;

	/* the simple_pin_fs calls will call remount with no options
	 * without this flag that would overwrite the real mount options (if any)
	 */
	ignore_mount = 1;

	/* create the devices special file */
	retval = simple_pin_fs("usbfs", &usbfs_mount, &usbfs_mount_count);
	if (retval) {
		err ("Unable to get usbfs mount");
		goto exit;
	}

	ignore_mount = 0;

	parent = usbfs_mount->mnt_sb->s_root;
	devices_usbfs_dentry = fs_create_file ("devices",
					       listmode | S_IFREG, parent,
					       NULL, &usbfs_devices_fops,
					       listuid, listgid);
	if (devices_usbfs_dentry == NULL) {
		err ("Unable to create devices usbfs file");
		retval = -ENODEV;
		goto error_clean_mounts;
	}

	goto exit;
	
error_clean_mounts:
	simple_release_fs(&usbfs_mount, &usbfs_mount_count);
exit:
	return retval;
}

static void remove_special_files (void)
{
	if (devices_usbfs_dentry)
		fs_remove_file (devices_usbfs_dentry);
	devices_usbfs_dentry = NULL;
	simple_release_fs(&usbfs_mount, &usbfs_mount_count);
}

void usbfs_update_special (void)
{
	struct inode *inode;

	if (devices_usbfs_dentry) {
		inode = devices_usbfs_dentry->d_inode;
		if (inode)
			inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	}
}

static void usbfs_add_bus(struct usb_bus *bus)
{
	struct dentry *parent;
	char name[8];
	int retval;

	/* create the special files if this is the first bus added */
	if (num_buses == 0) {
		retval = create_special_files();
		if (retval)
			return;
	}
	++num_buses;

	sprintf (name, "%03d", bus->busnum);

	parent = usbfs_mount->mnt_sb->s_root;
	bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
					    bus, NULL, busuid, busgid);
	if (bus->usbfs_dentry == NULL) {
		err ("error creating usbfs bus entry");
		return;
	}
}

static void usbfs_remove_bus(struct usb_bus *bus)
{
	if (bus->usbfs_dentry) {
		fs_remove_file (bus->usbfs_dentry);
		bus->usbfs_dentry = NULL;
	}

	--num_buses;
	if (num_buses <= 0) {
		remove_special_files();
		num_buses = 0;
	}
}

static void usbfs_add_device(struct usb_device *dev)
{
	char name[8];
	int i;
	int i_size;

	sprintf (name, "%03d", dev->devnum);
	dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG,
					    dev->bus->usbfs_dentry, dev,
					    &usbfs_device_file_operations,
					    devuid, devgid);
	if (dev->usbfs_dentry == NULL) {
		err ("error creating usbfs device entry");
		return;
	}

	/* Set the size of the device's file to be
	 * equal to the size of the device descriptors. */
	i_size = sizeof (struct usb_device_descriptor);
	for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) {
		struct usb_config_descriptor *config =
			(struct usb_config_descriptor *)dev->rawdescriptors[i];
		i_size += le16_to_cpu(config->wTotalLength);
	}
	if (dev->usbfs_dentry->d_inode)
		dev->usbfs_dentry->d_inode->i_size = i_size;
}

static void usbfs_remove_device(struct usb_device *dev)
{
	struct dev_state *ds;
	struct siginfo sinfo;

	if (dev->usbfs_dentry) {
		fs_remove_file (dev->usbfs_dentry);
		dev->usbfs_dentry = NULL;
	}
	while (!list_empty(&dev->filelist)) {
		ds = list_entry(dev->filelist.next, struct dev_state, list);
		wake_up_all(&ds->wait);
		list_del_init(&ds->list);
		if (ds->discsignr) {
			sinfo.si_signo = SIGPIPE;
			sinfo.si_errno = EPIPE;
			sinfo.si_code = SI_ASYNCIO;
			sinfo.si_addr = ds->disccontext;
			kill_proc_info_as_uid(ds->discsignr, &sinfo, ds->disc_pid, ds->disc_uid, ds->disc_euid);
		}
	}
}

static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev)
{
	switch (action) {
	case USB_DEVICE_ADD:
		usbfs_add_device(dev);
		break;
	case USB_DEVICE_REMOVE:
		usbfs_remove_device(dev);
		break;
	case USB_BUS_ADD:
		usbfs_add_bus(dev);
		break;
	case USB_BUS_REMOVE:
		usbfs_remove_bus(dev);
	}

	usbfs_update_special();
	usbfs_conn_disc_event();
	return NOTIFY_OK;
}

static struct notifier_block usbfs_nb = {
	.notifier_call = 	usbfs_notify,
};

/* --------------------------------------------------------------------- */

static struct proc_dir_entry *usbdir = NULL;

int __init usbfs_init(void)
{
	int retval;

	retval = register_filesystem(&usb_fs_type);
	if (retval)
		return retval;

	usb_register_notify(&usbfs_nb);

	/* create mount point for usbfs */
	usbdir = proc_mkdir("usb", proc_bus);

	return 0;
}

void usbfs_cleanup(void)
{
	usb_unregister_notify(&usbfs_nb);
	unregister_filesystem(&usb_fs_type);
	if (usbdir)
		remove_proc_entry("usb", proc_bus);
}