aboutsummaryrefslogtreecommitdiff
path: root/fs/hppfs/hppfs.c
blob: d92f4ce809252c0da7af915b83b496211e65f4d5 (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
761
762
763
764
765
766
767
768
769
770
771
772
773
/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/ctype.h>
#include <linux/dcache.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/slab.h>
#include <linux/statfs.h>
#include <linux/types.h>
#include <linux/pid_namespace.h>
#include <linux/namei.h>
#include <asm/uaccess.h>
#include "os.h"

static struct inode *get_inode(struct super_block *, struct dentry *);

struct hppfs_data {
	struct list_head list;
	char contents[PAGE_SIZE - sizeof(struct list_head)];
};

struct hppfs_private {
	struct file *proc_file;
	int host_fd;
	loff_t len;
	struct hppfs_data *contents;
};

struct hppfs_inode_info {
	struct dentry *proc_dentry;
	struct inode vfs_inode;
};

static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
{
	return container_of(inode, struct hppfs_inode_info, vfs_inode);
}

#define HPPFS_SUPER_MAGIC 0xb00000ee

static const struct super_operations hppfs_sbops;

static int is_pid(struct dentry *dentry)
{
	struct super_block *sb;
	int i;

	sb = dentry->d_sb;
	if (dentry->d_parent != sb->s_root)
		return 0;

	for (i = 0; i < dentry->d_name.len; i++) {
		if (!isdigit(dentry->d_name.name[i]))
			return 0;
	}
	return 1;
}

static char *dentry_name(struct dentry *dentry, int extra)
{
	struct dentry *parent;
	char *root, *name;
	const char *seg_name;
	int len, seg_len;

	len = 0;
	parent = dentry;
	while (parent->d_parent != parent) {
		if (is_pid(parent))
			len += strlen("pid") + 1;
		else len += parent->d_name.len + 1;
		parent = parent->d_parent;
	}

	root = "proc";
	len += strlen(root);
	name = kmalloc(len + extra + 1, GFP_KERNEL);
	if (name == NULL)
		return NULL;

	name[len] = '\0';
	parent = dentry;
	while (parent->d_parent != parent) {
		if (is_pid(parent)) {
			seg_name = "pid";
			seg_len = strlen("pid");
		}
		else {
			seg_name = parent->d_name.name;
			seg_len = parent->d_name.len;
		}

		len -= seg_len + 1;
		name[len] = '/';
		strncpy(&name[len + 1], seg_name, seg_len);
		parent = parent->d_parent;
	}
	strncpy(name, root, strlen(root));
	return name;
}

static int file_removed(struct dentry *dentry, const char *file)
{
	char *host_file;
	int extra, fd;

	extra = 0;
	if (file != NULL)
		extra += strlen(file) + 1;

	host_file = dentry_name(dentry, extra + strlen("/remove"));
	if (host_file == NULL) {
		printk(KERN_ERR "file_removed : allocation failed\n");
		return -ENOMEM;
	}

	if (file != NULL) {
		strcat(host_file, "/");
		strcat(host_file, file);
	}
	strcat(host_file, "/remove");

	fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
	kfree(host_file);
	if (fd > 0) {
		os_close_file(fd);
		return 1;
	}
	return 0;
}

static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
				   struct nameidata *nd)
{
	struct dentry *proc_dentry, *parent;
	struct qstr *name = &dentry->d_name;
	struct inode *inode;
	int err, deleted;

	deleted = file_removed(dentry, NULL);
	if (deleted < 0)
		return ERR_PTR(deleted);
	else if (deleted)
		return ERR_PTR(-ENOENT);

	parent = HPPFS_I(ino)->proc_dentry;
	mutex_lock(&parent->d_inode->i_mutex);
	proc_dentry = lookup_one_len(name->name, parent, name->len);
	mutex_unlock(&parent->d_inode->i_mutex);

	if (IS_ERR(proc_dentry))
		return proc_dentry;

	err = -ENOMEM;
	inode = get_inode(ino->i_sb, proc_dentry);
	if (!inode)
		goto out;

 	d_add(dentry, inode);
	return NULL;

 out:
	return ERR_PTR(err);
}

static const struct inode_operations hppfs_file_iops = {
};

static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
			 loff_t *ppos, int is_user)
{
	ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
	ssize_t n;

	read = file->f_path.dentry->d_inode->i_fop->read;

	if (!is_user)
		set_fs(KERNEL_DS);

	n = (*read)(file, buf, count, &file->f_pos);

	if (!is_user)
		set_fs(USER_DS);

	if (ppos)
		*ppos = file->f_pos;
	return n;
}

static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
{
	ssize_t n;
	int cur, err;
	char *new_buf;

	n = -ENOMEM;
	new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (new_buf == NULL) {
		printk(KERN_ERR "hppfs_read_file : kmalloc failed\n");
		goto out;
	}
	n = 0;
	while (count > 0) {
		cur = min_t(ssize_t, count, PAGE_SIZE);
		err = os_read_file(fd, new_buf, cur);
		if (err < 0) {
			printk(KERN_ERR "hppfs_read : read failed, "
			       "errno = %d\n", err);
			n = err;
			goto out_free;
		} else if (err == 0)
			break;

		if (copy_to_user(buf, new_buf, err)) {
			n = -EFAULT;
			goto out_free;
		}
		n += err;
		count -= err;
	}
 out_free:
	kfree(new_buf);
 out:
	return n;
}

static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
			  loff_t *ppos)
{
	struct hppfs_private *hppfs = file->private_data;
	struct hppfs_data *data;
	loff_t off;
	int err;

	if (hppfs->contents != NULL) {
		int rem;

		if (*ppos >= hppfs->len)
			return 0;

		data = hppfs->contents;
		off = *ppos;
		while (off >= sizeof(data->contents)) {
			data = list_entry(data->list.next, struct hppfs_data,
					  list);
			off -= sizeof(data->contents);
		}

		if (off + count > hppfs->len)
			count = hppfs->len - off;
		rem = copy_to_user(buf, &data->contents[off], count);
		*ppos += count - rem;
		if (rem > 0)
			return -EFAULT;
	} else if (hppfs->host_fd != -1) {
		err = os_seek_file(hppfs->host_fd, *ppos);
		if (err) {
			printk(KERN_ERR "hppfs_read : seek failed, "
			       "errno = %d\n", err);
			return err;
		}
		err = hppfs_read_file(hppfs->host_fd, buf, count);
		if (err < 0) {
			printk(KERN_ERR "hppfs_read: read failed: %d\n", err);
			return err;
		}
		count = err;
		if (count > 0)
			*ppos += count;
	}
	else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);

	return count;
}

static ssize_t hppfs_write(struct file *file, const char __user *buf,
			   size_t len, loff_t *ppos)
{
	struct hppfs_private *data = file->private_data;
	struct file *proc_file = data->proc_file;
	ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);

	write = proc_file->f_path.dentry->d_inode->i_fop->write;
	return (*write)(proc_file, buf, len, ppos);
}

static int open_host_sock(char *host_file, int *filter_out)
{
	char *end;
	int fd;

	end = &host_file[strlen(host_file)];
	strcpy(end, "/rw");
	*filter_out = 1;
	fd = os_connect_socket(host_file);
	if (fd > 0)
		return fd;

	strcpy(end, "/r");
	*filter_out = 0;
	fd = os_connect_socket(host_file);
	return fd;
}

static void free_contents(struct hppfs_data *head)
{
	struct hppfs_data *data;
	struct list_head *ele, *next;

	if (head == NULL)
		return;

	list_for_each_safe(ele, next, &head->list) {
		data = list_entry(ele, struct hppfs_data, list);
		kfree(data);
	}
	kfree(head);
}

static struct hppfs_data *hppfs_get_data(int fd, int filter,
					 struct file *proc_file,
					 struct file *hppfs_file,
					 loff_t *size_out)
{
	struct hppfs_data *data, *new, *head;
	int n, err;

	err = -ENOMEM;
	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL) {
		printk(KERN_ERR "hppfs_get_data : head allocation failed\n");
		goto failed;
	}

	INIT_LIST_HEAD(&data->list);

	head = data;
	*size_out = 0;

	if (filter) {
		while ((n = read_proc(proc_file, data->contents,
				      sizeof(data->contents), NULL, 0)) > 0)
			os_write_file(fd, data->contents, n);
		err = os_shutdown_socket(fd, 0, 1);
		if (err) {
			printk(KERN_ERR "hppfs_get_data : failed to shut down "
			       "socket\n");
			goto failed_free;
		}
	}
	while (1) {
		n = os_read_file(fd, data->contents, sizeof(data->contents));
		if (n < 0) {
			err = n;
			printk(KERN_ERR "hppfs_get_data : read failed, "
			       "errno = %d\n", err);
			goto failed_free;
		} else if (n == 0)
			break;

		*size_out += n;

		if (n < sizeof(data->contents))
			break;

		new = kmalloc(sizeof(*data), GFP_KERNEL);
		if (new == 0) {
			printk(KERN_ERR "hppfs_get_data : data allocation "
			       "failed\n");
			err = -ENOMEM;
			goto failed_free;
		}

		INIT_LIST_HEAD(&new->list);
		list_add(&new->list, &data->list);
		data = new;
	}
	return head;

 failed_free:
	free_contents(head);
 failed:
	return ERR_PTR(err);
}

static struct hppfs_private *hppfs_data(void)
{
	struct hppfs_private *data;

	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return data;

	*data = ((struct hppfs_private ) { .host_fd  		= -1,
					   .len  		= -1,
					   .contents 		= NULL } );
	return data;
}

static int file_mode(int fmode)
{
	if (fmode == (FMODE_READ | FMODE_WRITE))
		return O_RDWR;
	if (fmode == FMODE_READ)
		return O_RDONLY;
	if (fmode == FMODE_WRITE)
		return O_WRONLY;
	return 0;
}

static int hppfs_open(struct inode *inode, struct file *file)
{
	const struct cred *cred = file->f_cred;
	struct hppfs_private *data;
	struct vfsmount *proc_mnt;
	struct dentry *proc_dentry;
	char *host_file;
	int err, fd, type, filter;

	err = -ENOMEM;
	data = hppfs_data();
	if (data == NULL)
		goto out;

	host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
	if (host_file == NULL)
		goto out_free2;

	proc_dentry = HPPFS_I(inode)->proc_dentry;
	proc_mnt = inode->i_sb->s_fs_info;

	/* XXX This isn't closed anywhere */
	data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
				      file_mode(file->f_mode), cred);
	err = PTR_ERR(data->proc_file);
	if (IS_ERR(data->proc_file))
		goto out_free1;

	type = os_file_type(host_file);
	if (type == OS_TYPE_FILE) {
		fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
		if (fd >= 0)
			data->host_fd = fd;
		else
			printk(KERN_ERR "hppfs_open : failed to open '%s', "
			       "errno = %d\n", host_file, -fd);

		data->contents = NULL;
	} else if (type == OS_TYPE_DIR) {
		fd = open_host_sock(host_file, &filter);
		if (fd > 0) {
			data->contents = hppfs_get_data(fd, filter,
							data->proc_file,
							file, &data->len);
			if (!IS_ERR(data->contents))
				data->host_fd = fd;
		} else
			printk(KERN_ERR "hppfs_open : failed to open a socket "
			       "in '%s', errno = %d\n", host_file, -fd);
	}
	kfree(host_file);

	file->private_data = data;
	return 0;

 out_free1:
	kfree(host_file);
 out_free2:
	free_contents(data->contents);
	kfree(data);
 out:
	return err;
}

static int hppfs_dir_open(struct inode *inode, struct file *file)
{
	const struct cred *cred = file->f_cred;
	struct hppfs_private *data;
	struct vfsmount *proc_mnt;
	struct dentry *proc_dentry;
	int err;

	err = -ENOMEM;
	data = hppfs_data();
	if (data == NULL)
		goto out;

	proc_dentry = HPPFS_I(inode)->proc_dentry;
	proc_mnt = inode->i_sb->s_fs_info;
	data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
				      file_mode(file->f_mode), cred);
	err = PTR_ERR(data->proc_file);
	if (IS_ERR(data->proc_file))
		goto out_free;

	file->private_data = data;
	return 0;

 out_free:
	kfree(data);
 out:
	return err;
}

static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
{
	struct hppfs_private *data = file->private_data;
	struct file *proc_file = data->proc_file;
	loff_t (*llseek)(struct file *, loff_t, int);
	loff_t ret;

	llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
	if (llseek != NULL) {
		ret = (*llseek)(proc_file, off, where);
		if (ret < 0)
			return ret;
	}

	return default_llseek(file, off, where);
}

static const struct file_operations hppfs_file_fops = {
	.owner		= NULL,
	.llseek		= hppfs_llseek,
	.read		= hppfs_read,
	.write		= hppfs_write,
	.open		= hppfs_open,
};

struct hppfs_dirent {
	void *vfs_dirent;
	filldir_t filldir;
	struct dentry *dentry;
};

static int hppfs_filldir(void *d, const char *name, int size,
			 loff_t offset, u64 inode, unsigned int type)
{
	struct hppfs_dirent *dirent = d;

	if (file_removed(dirent->dentry, name))
		return 0;

	return (*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
				  inode, type);
}

static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
{
	struct hppfs_private *data = file->private_data;
	struct file *proc_file = data->proc_file;
	int (*readdir)(struct file *, void *, filldir_t);
	struct hppfs_dirent dirent = ((struct hppfs_dirent)
		                      { .vfs_dirent  	= ent,
					.filldir 	= filldir,
					.dentry  	= file->f_path.dentry
				      });
	int err;

	readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;

	proc_file->f_pos = file->f_pos;
	err = (*readdir)(proc_file, &dirent, hppfs_filldir);
	file->f_pos = proc_file->f_pos;

	return err;
}

static int hppfs_fsync(struct file *file, loff_t start, loff_t end,
		       int datasync)
{
	return filemap_write_and_wait_range(file->f_mapping, start, end);
}

static const struct file_operations hppfs_dir_fops = {
	.owner		= NULL,
	.readdir	= hppfs_readdir,
	.open		= hppfs_dir_open,
	.fsync		= hppfs_fsync,
	.llseek		= default_llseek,
};

static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
{
	sf->f_blocks = 0;
	sf->f_bfree = 0;
	sf->f_bavail = 0;
	sf->f_files = 0;
	sf->f_ffree = 0;
	sf->f_type = HPPFS_SUPER_MAGIC;
	return 0;
}

static struct inode *hppfs_alloc_inode(struct super_block *sb)
{
	struct hppfs_inode_info *hi;

	hi = kmalloc(sizeof(*hi), GFP_KERNEL);
	if (!hi)
		return NULL;

	hi->proc_dentry = NULL;
	inode_init_once(&hi->vfs_inode);
	return &hi->vfs_inode;
}

void hppfs_evict_inode(struct inode *ino)
{
	end_writeback(ino);
	dput(HPPFS_I(ino)->proc_dentry);
	mntput(ino->i_sb->s_fs_info);
}

static void hppfs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kfree(HPPFS_I(inode));
}

static void hppfs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, hppfs_i_callback);
}

static const struct super_operations hppfs_sbops = {
	.alloc_inode	= hppfs_alloc_inode,
	.destroy_inode	= hppfs_destroy_inode,
	.evict_inode	= hppfs_evict_inode,
	.statfs		= hppfs_statfs,
};

static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
			  int buflen)
{
	struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
	return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer,
						    buflen);
}

static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;

	return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
}

static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd,
			   void *cookie)
{
	struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;

	if (proc_dentry->d_inode->i_op->put_link)
		proc_dentry->d_inode->i_op->put_link(proc_dentry, nd, cookie);
}

static const struct inode_operations hppfs_dir_iops = {
	.lookup		= hppfs_lookup,
};

static const struct inode_operations hppfs_link_iops = {
	.readlink	= hppfs_readlink,
	.follow_link	= hppfs_follow_link,
	.put_link	= hppfs_put_link,
};

static struct inode *get_inode(struct super_block *sb, struct dentry *dentry)
{
	struct inode *proc_ino = dentry->d_inode;
	struct inode *inode = new_inode(sb);

	if (!inode) {
		dput(dentry);
		return ERR_PTR(-ENOMEM);
	}

	if (S_ISDIR(dentry->d_inode->i_mode)) {
		inode->i_op = &hppfs_dir_iops;
		inode->i_fop = &hppfs_dir_fops;
	} else if (S_ISLNK(dentry->d_inode->i_mode)) {
		inode->i_op = &hppfs_link_iops;
		inode->i_fop = &hppfs_file_fops;
	} else {
		inode->i_op = &hppfs_file_iops;
		inode->i_fop = &hppfs_file_fops;
	}

	HPPFS_I(inode)->proc_dentry = dentry;

	inode->i_uid = proc_ino->i_uid;
	inode->i_gid = proc_ino->i_gid;
	inode->i_atime = proc_ino->i_atime;
	inode->i_mtime = proc_ino->i_mtime;
	inode->i_ctime = proc_ino->i_ctime;
	inode->i_ino = proc_ino->i_ino;
	inode->i_mode = proc_ino->i_mode;
	set_nlink(inode, proc_ino->i_nlink);
	inode->i_size = proc_ino->i_size;
	inode->i_blocks = proc_ino->i_blocks;

	return inode;
}

static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
{
	struct inode *root_inode;
	struct vfsmount *proc_mnt;
	int err = -ENOENT;

	proc_mnt = mntget(current->nsproxy->pid_ns->proc_mnt);
	if (IS_ERR(proc_mnt))
		goto out;

	sb->s_blocksize = 1024;
	sb->s_blocksize_bits = 10;
	sb->s_magic = HPPFS_SUPER_MAGIC;
	sb->s_op = &hppfs_sbops;
	sb->s_fs_info = proc_mnt;

	err = -ENOMEM;
	root_inode = get_inode(sb, dget(proc_mnt->mnt_root));
	if (!root_inode)
		goto out_mntput;

	sb->s_root = d_alloc_root(root_inode);
	if (!sb->s_root)
		goto out_iput;

	return 0;

 out_iput:
	iput(root_inode);
 out_mntput:
	mntput(proc_mnt);
 out:
	return(err);
}

static struct dentry *hppfs_read_super(struct file_system_type *type,
			    int flags, const char *dev_name,
			    void *data)
{
	return mount_nodev(type, flags, data, hppfs_fill_super);
}

static struct file_system_type hppfs_type = {
	.owner 		= THIS_MODULE,
	.name 		= "hppfs",
	.mount 		= hppfs_read_super,
	.kill_sb	= kill_anon_super,
	.fs_flags 	= 0,
};

static int __init init_hppfs(void)
{
	return register_filesystem(&hppfs_type);
}

static void __exit exit_hppfs(void)
{
	unregister_filesystem(&hppfs_type);
}

module_init(init_hppfs)
module_exit(exit_hppfs)
MODULE_LICENSE("GPL");