summaryrefslogtreecommitdiffstats
path: root/fs/smbfs/inode.c
blob: 5faba4f1c9abe7deb370d24b74412bad148468f7 (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
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
/*
 *  inode.c
 *
 *  Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
 *  Copyright (C) 1997 by Volker Lendecke
 *
 *  Please add a note about your changes to smbfs in the ChangeLog file.
 */

#include <linux/module.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/file.h>
#include <linux/dcache.h>
#include <linux/smp_lock.h>
#include <linux/nls.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/net.h>
#include <linux/vfs.h>
#include <linux/highuid.h>
#include <linux/smb_fs.h>
#include <linux/smbno.h>
#include <linux/smb_mount.h>

#include <asm/system.h>
#include <asm/uaccess.h>

#include "smb_debug.h"
#include "getopt.h"
#include "proto.h"

/* Always pick a default string */
#ifdef CONFIG_SMB_NLS_REMOTE
#define SMB_NLS_REMOTE CONFIG_SMB_NLS_REMOTE
#else
#define SMB_NLS_REMOTE ""
#endif

#define SMB_TTL_DEFAULT 1000

static void smb_delete_inode(struct inode *);
static void smb_put_super(struct super_block *);
static int  smb_statfs(struct dentry *, struct kstatfs *);
static int  smb_show_options(struct seq_file *, struct vfsmount *);

static struct kmem_cache *smb_inode_cachep;

static struct inode *smb_alloc_inode(struct super_block *sb)
{
	struct smb_inode_info *ei;
	ei = (struct smb_inode_info *)kmem_cache_alloc(smb_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

static void smb_destroy_inode(struct inode *inode)
{
	kmem_cache_free(smb_inode_cachep, SMB_I(inode));
}

static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
{
	struct smb_inode_info *ei = (struct smb_inode_info *) foo;
	unsigned long flagmask = SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR;

	if ((flags & flagmask) == SLAB_CTOR_CONSTRUCTOR)
		inode_init_once(&ei->vfs_inode);
}
 
static int init_inodecache(void)
{
	smb_inode_cachep = kmem_cache_create("smb_inode_cache",
					     sizeof(struct smb_inode_info),
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
					     init_once, NULL);
	if (smb_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	kmem_cache_destroy(smb_inode_cachep);
}

static int smb_remount(struct super_block *sb, int *flags, char *data)
{
	*flags |= MS_NODIRATIME;
	return 0;
}

static const struct super_operations smb_sops =
{
	.alloc_inode	= smb_alloc_inode,
	.destroy_inode	= smb_destroy_inode,
	.drop_inode	= generic_delete_inode,
	.delete_inode	= smb_delete_inode,
	.put_super	= smb_put_super,
	.statfs		= smb_statfs,
	.show_options	= smb_show_options,
	.remount_fs	= smb_remount,
};


/* We are always generating a new inode here */
struct inode *
smb_iget(struct super_block *sb, struct smb_fattr *fattr)
{
	struct smb_sb_info *server = SMB_SB(sb);
	struct inode *result;

	DEBUG1("smb_iget: %p\n", fattr);

	result = new_inode(sb);
	if (!result)
		return result;
	result->i_ino = fattr->f_ino;
	SMB_I(result)->open = 0;
	SMB_I(result)->fileid = 0;
	SMB_I(result)->access = 0;
	SMB_I(result)->flags = 0;
	SMB_I(result)->closed = 0;
	SMB_I(result)->openers = 0;
	smb_set_inode_attr(result, fattr);
	if (S_ISREG(result->i_mode)) {
		result->i_op = &smb_file_inode_operations;
		result->i_fop = &smb_file_operations;
		result->i_data.a_ops = &smb_file_aops;
	} else if (S_ISDIR(result->i_mode)) {
		if (server->opt.capabilities & SMB_CAP_UNIX)
			result->i_op = &smb_dir_inode_operations_unix;
		else
			result->i_op = &smb_dir_inode_operations;
		result->i_fop = &smb_dir_operations;
	} else if (S_ISLNK(result->i_mode)) {
		result->i_op = &smb_link_inode_operations;
	} else {
		init_special_inode(result, result->i_mode, fattr->f_rdev);
	}
	insert_inode_hash(result);
	return result;
}

/*
 * Copy the inode data to a smb_fattr structure.
 */
void
smb_get_inode_attr(struct inode *inode, struct smb_fattr *fattr)
{
	memset(fattr, 0, sizeof(struct smb_fattr));
	fattr->f_mode	= inode->i_mode;
	fattr->f_nlink	= inode->i_nlink;
	fattr->f_ino	= inode->i_ino;
	fattr->f_uid	= inode->i_uid;
	fattr->f_gid	= inode->i_gid;
	fattr->f_size	= inode->i_size;
	fattr->f_mtime	= inode->i_mtime;
	fattr->f_ctime	= inode->i_ctime;
	fattr->f_atime	= inode->i_atime;
	fattr->f_blocks	= inode->i_blocks;

	fattr->attr	= SMB_I(inode)->attr;
	/*
	 * Keep the attributes in sync with the inode permissions.
	 */
	if (fattr->f_mode & S_IWUSR)
		fattr->attr &= ~aRONLY;
	else
		fattr->attr |= aRONLY;
}

/*
 * Update the inode, possibly causing it to invalidate its pages if mtime/size
 * is different from last time.
 */
void
smb_set_inode_attr(struct inode *inode, struct smb_fattr *fattr)
{
	struct smb_inode_info *ei = SMB_I(inode);

	/*
	 * A size change should have a different mtime, or same mtime
	 * but different size.
	 */
	time_t last_time = inode->i_mtime.tv_sec;
	loff_t last_sz = inode->i_size;

	inode->i_mode	= fattr->f_mode;
	inode->i_nlink	= fattr->f_nlink;
	inode->i_uid	= fattr->f_uid;
	inode->i_gid	= fattr->f_gid;
	inode->i_ctime	= fattr->f_ctime;
	inode->i_blocks = fattr->f_blocks;
	inode->i_size	= fattr->f_size;
	inode->i_mtime	= fattr->f_mtime;
	inode->i_atime	= fattr->f_atime;
	ei->attr = fattr->attr;

	/*
	 * Update the "last time refreshed" field for revalidation.
	 */
	ei->oldmtime = jiffies;

	if (inode->i_mtime.tv_sec != last_time || inode->i_size != last_sz) {
		VERBOSE("%ld changed, old=%ld, new=%ld, oz=%ld, nz=%ld\n",
			inode->i_ino,
			(long) last_time, (long) inode->i_mtime.tv_sec,
			(long) last_sz, (long) inode->i_size);

		if (!S_ISDIR(inode->i_mode))
			invalidate_remote_inode(inode);
	}
}

/*
 * This is called if the connection has gone bad ...
 * try to kill off all the current inodes.
 */
void
smb_invalidate_inodes(struct smb_sb_info *server)
{
	VERBOSE("\n");
	shrink_dcache_sb(SB_of(server));
	invalidate_inodes(SB_of(server));
}

/*
 * This is called to update the inode attributes after
 * we've made changes to a file or directory.
 */
static int
smb_refresh_inode(struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	int error;
	struct smb_fattr fattr;

	error = smb_proc_getattr(dentry, &fattr);
	if (!error) {
		smb_renew_times(dentry);
		/*
		 * Check whether the type part of the mode changed,
		 * and don't update the attributes if it did.
		 *
		 * And don't dick with the root inode
		 */
		if (inode->i_ino == 2)
			return error;
		if (S_ISLNK(inode->i_mode))
			return error;	/* VFS will deal with it */

		if ((inode->i_mode & S_IFMT) == (fattr.f_mode & S_IFMT)) {
			smb_set_inode_attr(inode, &fattr);
		} else {
			/*
			 * Big trouble! The inode has become a new object,
			 * so any operations attempted on it are invalid.
			 *
			 * To limit damage, mark the inode as bad so that
			 * subsequent lookup validations will fail.
			 */
			PARANOIA("%s/%s changed mode, %07o to %07o\n",
				 DENTRY_PATH(dentry),
				 inode->i_mode, fattr.f_mode);

			fattr.f_mode = inode->i_mode; /* save mode */
			make_bad_inode(inode);
			inode->i_mode = fattr.f_mode; /* restore mode */
			/*
			 * No need to worry about unhashing the dentry: the
			 * lookup validation will see that the inode is bad.
			 * But we do want to invalidate the caches ...
			 */
			if (!S_ISDIR(inode->i_mode))
				invalidate_remote_inode(inode);
			else
				smb_invalid_dir_cache(inode);
			error = -EIO;
		}
	}
	return error;
}

/*
 * This is called when we want to check whether the inode
 * has changed on the server.  If it has changed, we must
 * invalidate our local caches.
 */
int
smb_revalidate_inode(struct dentry *dentry)
{
	struct smb_sb_info *s = server_from_dentry(dentry);
	struct inode *inode = dentry->d_inode;
	int error = 0;

	DEBUG1("smb_revalidate_inode\n");
	lock_kernel();

	/*
	 * Check whether we've recently refreshed the inode.
	 */
	if (time_before(jiffies, SMB_I(inode)->oldmtime + SMB_MAX_AGE(s))) {
		VERBOSE("up-to-date, ino=%ld, jiffies=%lu, oldtime=%lu\n",
			inode->i_ino, jiffies, SMB_I(inode)->oldmtime);
		goto out;
	}

	error = smb_refresh_inode(dentry);
out:
	unlock_kernel();
	return error;
}

/*
 * This routine is called when i_nlink == 0 and i_count goes to 0.
 * All blocking cleanup operations need to go here to avoid races.
 */
static void
smb_delete_inode(struct inode *ino)
{
	DEBUG1("ino=%ld\n", ino->i_ino);
	truncate_inode_pages(&ino->i_data, 0);
	lock_kernel();
	if (smb_close(ino))
		PARANOIA("could not close inode %ld\n", ino->i_ino);
	unlock_kernel();
	clear_inode(ino);
}

static struct option opts[] = {
	{ "version",	0, 'v' },
	{ "win95",	SMB_MOUNT_WIN95, 1 },
	{ "oldattr",	SMB_MOUNT_OLDATTR, 1 },
	{ "dirattr",	SMB_MOUNT_DIRATTR, 1 },
	{ "case",	SMB_MOUNT_CASE, 1 },
	{ "uid",	0, 'u' },
	{ "gid",	0, 'g' },
	{ "file_mode",	0, 'f' },
	{ "dir_mode",	0, 'd' },
	{ "iocharset",	0, 'i' },
	{ "codepage",	0, 'c' },
	{ "ttl",	0, 't' },
	{ NULL,		0, 0}
};

static int
parse_options(struct smb_mount_data_kernel *mnt, char *options)
{
	int c;
	unsigned long flags;
	unsigned long value;
	char *optarg;
	char *optopt;

	flags = 0;
	while ( (c = smb_getopt("smbfs", &options, opts,
				&optopt, &optarg, &flags, &value)) > 0) {

		VERBOSE("'%s' -> '%s'\n", optopt, optarg ? optarg : "<none>");
		switch (c) {
		case 1:
			/* got a "flag" option */
			break;
		case 'v':
			if (value != SMB_MOUNT_VERSION) {
			printk ("smbfs: Bad mount version %ld, expected %d\n",
				value, SMB_MOUNT_VERSION);
				return 0;
			}
			mnt->version = value;
			break;
		case 'u':
			mnt->uid = value;
			flags |= SMB_MOUNT_UID;
			break;
		case 'g':
			mnt->gid = value;
			flags |= SMB_MOUNT_GID;
			break;
		case 'f':
			mnt->file_mode = (value & S_IRWXUGO) | S_IFREG;
			flags |= SMB_MOUNT_FMODE;
			break;
		case 'd':
			mnt->dir_mode = (value & S_IRWXUGO) | S_IFDIR;
			flags |= SMB_MOUNT_DMODE;
			break;
		case 'i':
			strlcpy(mnt->codepage.local_name, optarg, 
				SMB_NLS_MAXNAMELEN);
			break;
		case 'c':
			strlcpy(mnt->codepage.remote_name, optarg,
				SMB_NLS_MAXNAMELEN);
			break;
		case 't':
			mnt->ttl = value;
			break;
		default:
			printk ("smbfs: Unrecognized mount option %s\n",
				optopt);
			return -1;
		}
	}
	mnt->flags = flags;
	return c;
}

/*
 * smb_show_options() is for displaying mount options in /proc/mounts.
 * It tries to avoid showing settings that were not changed from their
 * defaults.
 */
static int
smb_show_options(struct seq_file *s, struct vfsmount *m)
{
	struct smb_mount_data_kernel *mnt = SMB_SB(m->mnt_sb)->mnt;
	int i;

	for (i = 0; opts[i].name != NULL; i++)
		if (mnt->flags & opts[i].flag)
			seq_printf(s, ",%s", opts[i].name);

	if (mnt->flags & SMB_MOUNT_UID)
		seq_printf(s, ",uid=%d", mnt->uid);
	if (mnt->flags & SMB_MOUNT_GID)
		seq_printf(s, ",gid=%d", mnt->gid);
	if (mnt->mounted_uid != 0)
		seq_printf(s, ",mounted_uid=%d", mnt->mounted_uid);

	/* 
	 * Defaults for file_mode and dir_mode are unknown to us; they
	 * depend on the current umask of the user doing the mount.
	 */
	if (mnt->flags & SMB_MOUNT_FMODE)
		seq_printf(s, ",file_mode=%04o", mnt->file_mode & S_IRWXUGO);
	if (mnt->flags & SMB_MOUNT_DMODE)
		seq_printf(s, ",dir_mode=%04o", mnt->dir_mode & S_IRWXUGO);

	if (strcmp(mnt->codepage.local_name, CONFIG_NLS_DEFAULT))
		seq_printf(s, ",iocharset=%s", mnt->codepage.local_name);
	if (strcmp(mnt->codepage.remote_name, SMB_NLS_REMOTE))
		seq_printf(s, ",codepage=%s", mnt->codepage.remote_name);

	if (mnt->ttl != SMB_TTL_DEFAULT)
		seq_printf(s, ",ttl=%d", mnt->ttl);

	return 0;
}

static void
smb_unload_nls(struct smb_sb_info *server)
{
	if (server->remote_nls) {
		unload_nls(server->remote_nls);
		server->remote_nls = NULL;
	}
	if (server->local_nls) {
		unload_nls(server->local_nls);
		server->local_nls = NULL;
	}
}

static void
smb_put_super(struct super_block *sb)
{
	struct smb_sb_info *server = SMB_SB(sb);

	smb_lock_server(server);
	server->state = CONN_INVALID;
	smbiod_unregister_server(server);

	smb_close_socket(server);

	if (server->conn_pid)
		kill_pid(server->conn_pid, SIGTERM, 1);

	kfree(server->ops);
	smb_unload_nls(server);
	sb->s_fs_info = NULL;
	smb_unlock_server(server);
	put_pid(server->conn_pid);
	kfree(server);
}

static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
{
	struct smb_sb_info *server;
	struct smb_mount_data_kernel *mnt;
	struct smb_mount_data *oldmnt;
	struct inode *root_inode;
	struct smb_fattr root;
	int ver;
	void *mem;

	if (!raw_data)
		goto out_no_data;

	oldmnt = (struct smb_mount_data *) raw_data;
	ver = oldmnt->version;
	if (ver != SMB_MOUNT_OLDVERSION && cpu_to_be32(ver) != SMB_MOUNT_ASCII)
		goto out_wrong_data;

	sb->s_flags |= MS_NODIRATIME;
	sb->s_blocksize = 1024;	/* Eh...  Is this correct? */
	sb->s_blocksize_bits = 10;
	sb->s_magic = SMB_SUPER_MAGIC;
	sb->s_op = &smb_sops;
	sb->s_time_gran = 100;

	server = kzalloc(sizeof(struct smb_sb_info), GFP_KERNEL);
	if (!server)
		goto out_no_server;
	sb->s_fs_info = server;

	server->super_block = sb;
	server->mnt = NULL;
	server->sock_file = NULL;
	init_waitqueue_head(&server->conn_wq);
	init_MUTEX(&server->sem);
	INIT_LIST_HEAD(&server->entry);
	INIT_LIST_HEAD(&server->xmitq);
	INIT_LIST_HEAD(&server->recvq);
	server->conn_error = 0;
	server->conn_pid = NULL;
	server->state = CONN_INVALID; /* no connection yet */
	server->generation = 0;

	/* Allocate the global temp buffer and some superblock helper structs */
	/* FIXME: move these to the smb_sb_info struct */
	VERBOSE("alloc chunk = %d\n", sizeof(struct smb_ops) +
		sizeof(struct smb_mount_data_kernel));
	mem = kmalloc(sizeof(struct smb_ops) +
		      sizeof(struct smb_mount_data_kernel), GFP_KERNEL);
	if (!mem)
		goto out_no_mem;

	server->ops = mem;
	smb_install_null_ops(server->ops);
	server->mnt = mem + sizeof(struct smb_ops);

	/* Setup NLS stuff */
	server->remote_nls = NULL;
	server->local_nls = NULL;

	mnt = server->mnt;

	memset(mnt, 0, sizeof(struct smb_mount_data_kernel));
	strlcpy(mnt->codepage.local_name, CONFIG_NLS_DEFAULT,
		SMB_NLS_MAXNAMELEN);
	strlcpy(mnt->codepage.remote_name, SMB_NLS_REMOTE,
		SMB_NLS_MAXNAMELEN);

	mnt->ttl = SMB_TTL_DEFAULT;
	if (ver == SMB_MOUNT_OLDVERSION) {
		mnt->version = oldmnt->version;

		SET_UID(mnt->uid, oldmnt->uid);
		SET_GID(mnt->gid, oldmnt->gid);

		mnt->file_mode = (oldmnt->file_mode & S_IRWXUGO) | S_IFREG;
		mnt->dir_mode = (oldmnt->dir_mode & S_IRWXUGO) | S_IFDIR;

		mnt->flags = (oldmnt->file_mode >> 9) | SMB_MOUNT_UID |
			SMB_MOUNT_GID | SMB_MOUNT_FMODE | SMB_MOUNT_DMODE;
	} else {
		mnt->file_mode = S_IRWXU | S_IRGRP | S_IXGRP |
				S_IROTH | S_IXOTH | S_IFREG;
		mnt->dir_mode = S_IRWXU | S_IRGRP | S_IXGRP |
				S_IROTH | S_IXOTH | S_IFDIR;
		if (parse_options(mnt, raw_data))
			goto out_bad_option;
	}
	mnt->mounted_uid = current->uid;
	smb_setcodepage(server, &mnt->codepage);

	/*
	 * Display the enabled options
	 * Note: smb_proc_getattr uses these in 2.4 (but was changed in 2.2)
	 */
	if (mnt->flags & SMB_MOUNT_OLDATTR)
		printk("SMBFS: Using core getattr (Win 95 speedup)\n");
	else if (mnt->flags & SMB_MOUNT_DIRATTR)
		printk("SMBFS: Using dir ff getattr\n");

	if (smbiod_register_server(server) < 0) {
		printk(KERN_ERR "smbfs: failed to start smbiod\n");
		goto out_no_smbiod;
	}

	/*
	 * Keep the super block locked while we get the root inode.
	 */
	smb_init_root_dirent(server, &root, sb);
	root_inode = smb_iget(sb, &root);
	if (!root_inode)
		goto out_no_root;

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

	smb_new_dentry(sb->s_root);

	return 0;

out_no_root:
	iput(root_inode);
out_no_smbiod:
	smb_unload_nls(server);
out_bad_option:
	kfree(mem);
out_no_mem:
	if (!server->mnt)
		printk(KERN_ERR "smb_fill_super: allocation failure\n");
	sb->s_fs_info = NULL;
	kfree(server);
	goto out_fail;
out_wrong_data:
	printk(KERN_ERR "smbfs: mount_data version %d is not supported\n", ver);
	goto out_fail;
out_no_data:
	printk(KERN_ERR "smb_fill_super: missing data argument\n");
out_fail:
	return -EINVAL;
out_no_server:
	printk(KERN_ERR "smb_fill_super: cannot allocate struct smb_sb_info\n");
	return -ENOMEM;
}

static int
smb_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	int result;
	
	lock_kernel();

	result = smb_proc_dskattr(dentry, buf);

	unlock_kernel();

	buf->f_type = SMB_SUPER_MAGIC;
	buf->f_namelen = SMB_MAXPATHLEN;
	return result;
}

int smb_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	int err = smb_revalidate_inode(dentry);
	if (!err)
		generic_fillattr(dentry->d_inode, stat);
	return err;
}

int
smb_notify_change(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
	struct smb_sb_info *server = server_from_dentry(dentry);
	unsigned int mask = (S_IFREG | S_IFDIR | S_IRWXUGO);
	int error, changed, refresh = 0;
	struct smb_fattr fattr;

	lock_kernel();

	error = smb_revalidate_inode(dentry);
	if (error)
		goto out;

	if ((error = inode_change_ok(inode, attr)) < 0)
		goto out;

	error = -EPERM;
	if ((attr->ia_valid & ATTR_UID) && (attr->ia_uid != server->mnt->uid))
		goto out;

	if ((attr->ia_valid & ATTR_GID) && (attr->ia_uid != server->mnt->gid))
		goto out;

	if ((attr->ia_valid & ATTR_MODE) && (attr->ia_mode & ~mask))
		goto out;

	if ((attr->ia_valid & ATTR_SIZE) != 0) {
		VERBOSE("changing %s/%s, old size=%ld, new size=%ld\n",
			DENTRY_PATH(dentry),
			(long) inode->i_size, (long) attr->ia_size);

		filemap_write_and_wait(inode->i_mapping);

		error = smb_open(dentry, O_WRONLY);
		if (error)
			goto out;
		error = server->ops->truncate(inode, attr->ia_size);
		if (error)
			goto out;
		error = vmtruncate(inode, attr->ia_size);
		if (error)
			goto out;
		refresh = 1;
	}

	if (server->opt.capabilities & SMB_CAP_UNIX) {
		/* For now we don't want to set the size with setattr_unix */
		attr->ia_valid &= ~ATTR_SIZE;
		/* FIXME: only call if we actually want to set something? */
		error = smb_proc_setattr_unix(dentry, attr, 0, 0);
		if (!error)
			refresh = 1;

		goto out;
	}

	/*
	 * Initialize the fattr and check for changed fields.
	 * Note: CTIME under SMB is creation time rather than
	 * change time, so we don't attempt to change it.
	 */
	smb_get_inode_attr(inode, &fattr);

	changed = 0;
	if ((attr->ia_valid & ATTR_MTIME) != 0) {
		fattr.f_mtime = attr->ia_mtime;
		changed = 1;
	}
	if ((attr->ia_valid & ATTR_ATIME) != 0) {
		fattr.f_atime = attr->ia_atime;
		/* Earlier protocols don't have an access time */
		if (server->opt.protocol >= SMB_PROTOCOL_LANMAN2)
			changed = 1;
	}
	if (changed) {
		error = smb_proc_settime(dentry, &fattr);
		if (error)
			goto out;
		refresh = 1;
	}

	/*
	 * Check for mode changes ... we're extremely limited in
	 * what can be set for SMB servers: just the read-only bit.
	 */
	if ((attr->ia_valid & ATTR_MODE) != 0) {
		VERBOSE("%s/%s mode change, old=%x, new=%x\n",
			DENTRY_PATH(dentry), fattr.f_mode, attr->ia_mode);
		changed = 0;
		if (attr->ia_mode & S_IWUSR) {
			if (fattr.attr & aRONLY) {
				fattr.attr &= ~aRONLY;
				changed = 1;
			}
		} else {
			if (!(fattr.attr & aRONLY)) {
				fattr.attr |= aRONLY;
				changed = 1;
			}
		}
		if (changed) {
			error = smb_proc_setattr(dentry, &fattr);
			if (error)
				goto out;
			refresh = 1;
		}
	}
	error = 0;

out:
	if (refresh)
		smb_refresh_inode(dentry);
	unlock_kernel();
	return error;
}

static int smb_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_nodev(fs_type, flags, data, smb_fill_super, mnt);
}

static struct file_system_type smb_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "smbfs",
	.get_sb		= smb_get_sb,
	.kill_sb	= kill_anon_super,
	.fs_flags	= FS_BINARY_MOUNTDATA,
};

static int __init init_smb_fs(void)
{
	int err;
	DEBUG1("registering ...\n");

	err = init_inodecache();
	if (err)
		goto out_inode;
	err = smb_init_request_cache();
	if (err)
		goto out_request;
	err = register_filesystem(&smb_fs_type);
	if (err)
		goto out;
	return 0;
out:
	smb_destroy_request_cache();
out_request:
	destroy_inodecache();
out_inode:
	return err;
}

static void __exit exit_smb_fs(void)
{
	DEBUG1("unregistering ...\n");
	unregister_filesystem(&smb_fs_type);
	smb_destroy_request_cache();
	destroy_inodecache();
}

module_init(init_smb_fs)
module_exit(exit_smb_fs)
MODULE_LICENSE("GPL");