summaryrefslogtreecommitdiffstats
path: root/fs/ntfs3/super.c
blob: 4643b06b1550f786fc65aa97dfe74d382329c821 (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
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
// SPDX-License-Identifier: GPL-2.0
/*
 *
 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
 *
 *
 *                 terminology
 *
 * cluster - allocation unit     - 512,1K,2K,4K,...,2M
 * vcn - virtual cluster number  - Offset inside the file in clusters.
 * vbo - virtual byte offset     - Offset inside the file in bytes.
 * lcn - logical cluster number  - 0 based cluster in clusters heap.
 * lbo - logical byte offset     - Absolute position inside volume.
 * run - maps VCN to LCN         - Stored in attributes in packed form.
 * attr - attribute segment      - std/name/data etc records inside MFT.
 * mi  - MFT inode               - One MFT record(usually 1024 bytes or 4K), consists of attributes.
 * ni  - NTFS inode              - Extends linux inode. consists of one or more mft inodes.
 * index - unit inside directory - 2K, 4K, <=page size, does not depend on cluster size.
 *
 * WSL - Windows Subsystem for Linux
 * https://docs.microsoft.com/en-us/windows/wsl/file-permissions
 * It stores uid/gid/mode/dev in xattr
 *
 * ntfs allows up to 2^64 clusters per volume.
 * It means you should use 64 bits lcn to operate with ntfs.
 * Implementation of ntfs.sys uses only 32 bits lcn.
 * Default ntfs3 uses 32 bits lcn too.
 * ntfs3 built with CONFIG_NTFS3_64BIT_CLUSTER (ntfs3_64) uses 64 bits per lcn.
 *
 *
 *     ntfs limits, cluster size is 4K (2^12)
 * -----------------------------------------------------------------------------
 * | Volume size   | Clusters | ntfs.sys | ntfs3  | ntfs3_64 | mkntfs | chkdsk |
 * -----------------------------------------------------------------------------
 * | < 16T, 2^44   |  < 2^32  |  yes     |  yes   |   yes    |  yes   |  yes   |
 * | > 16T, 2^44   |  > 2^32  |  no      |  no    |   yes    |  yes   |  yes   |
 * ----------------------------------------------------------|------------------
 *
 * To mount large volumes as ntfs one should use large cluster size (up to 2M)
 * The maximum volume size in this case is 2^32 * 2^21 = 2^53 = 8P
 *
 *     ntfs limits, cluster size is 2M (2^21)
 * -----------------------------------------------------------------------------
 * | < 8P, 2^53    |  < 2^32  |  yes     |  yes   |   yes    |  yes   |  yes   |
 * | > 8P, 2^53    |  > 2^32  |  no      |  no    |   yes    |  yes   |  yes   |
 * ----------------------------------------------------------|------------------
 *
 */

#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/log2.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/nls.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/statfs.h>

#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
#ifdef CONFIG_NTFS3_LZX_XPRESS
#include "lib/lib.h"
#endif

#ifdef CONFIG_PRINTK
/*
 * ntfs_printk - Trace warnings/notices/errors.
 *
 * Thanks Joe Perches <joe@perches.com> for implementation
 */
void ntfs_printk(const struct super_block *sb, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	int level;
	struct ntfs_sb_info *sbi = sb->s_fs_info;

	/* Should we use different ratelimits for warnings/notices/errors? */
	if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
		return;

	va_start(args, fmt);

	level = printk_get_level(fmt);
	vaf.fmt = printk_skip_level(fmt);
	vaf.va = &args;
	printk("%c%cntfs3: %s: %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf);

	va_end(args);
}

static char s_name_buf[512];
static atomic_t s_name_buf_cnt = ATOMIC_INIT(1); // 1 means 'free s_name_buf'.

/*
 * ntfs_inode_printk
 *
 * Print warnings/notices/errors about inode using name or inode number.
 */
void ntfs_inode_printk(struct inode *inode, const char *fmt, ...)
{
	struct super_block *sb = inode->i_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	char *name;
	va_list args;
	struct va_format vaf;
	int level;

	if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
		return;

	/* Use static allocated buffer, if possible. */
	name = atomic_dec_and_test(&s_name_buf_cnt) ?
		       s_name_buf :
		       kmalloc(sizeof(s_name_buf), GFP_NOFS);

	if (name) {
		struct dentry *de = d_find_alias(inode);

		if (de) {
			spin_lock(&de->d_lock);
			snprintf(name, sizeof(s_name_buf), " \"%s\"",
				 de->d_name.name);
			spin_unlock(&de->d_lock);
		} else {
			name[0] = 0;
		}
		dput(de); /* Cocci warns if placed in branch "if (de)" */
	}

	va_start(args, fmt);

	level = printk_get_level(fmt);
	vaf.fmt = printk_skip_level(fmt);
	vaf.va = &args;

	printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level,
	       sb->s_id, inode->i_ino, name ? name : "", &vaf);

	va_end(args);

	atomic_inc(&s_name_buf_cnt);
	if (name != s_name_buf)
		kfree(name);
}
#endif

/*
 * Shared memory struct.
 *
 * On-disk ntfs's upcase table is created by ntfs formatter.
 * 'upcase' table is 128K bytes of memory.
 * We should read it into memory when mounting.
 * Several ntfs volumes likely use the same 'upcase' table.
 * It is good idea to share in-memory 'upcase' table between different volumes.
 * Unfortunately winxp/vista/win7 use different upcase tables.
 */
static DEFINE_SPINLOCK(s_shared_lock);

static struct {
	void *ptr;
	u32 len;
	int cnt;
} s_shared[8];

/*
 * ntfs_set_shared
 *
 * Return:
 * * @ptr - If pointer was saved in shared memory.
 * * NULL - If pointer was not shared.
 */
void *ntfs_set_shared(void *ptr, u32 bytes)
{
	void *ret = NULL;
	int i, j = -1;

	spin_lock(&s_shared_lock);
	for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
		if (!s_shared[i].cnt) {
			j = i;
		} else if (bytes == s_shared[i].len &&
			   !memcmp(s_shared[i].ptr, ptr, bytes)) {
			s_shared[i].cnt += 1;
			ret = s_shared[i].ptr;
			break;
		}
	}

	if (!ret && j != -1) {
		s_shared[j].ptr = ptr;
		s_shared[j].len = bytes;
		s_shared[j].cnt = 1;
		ret = ptr;
	}
	spin_unlock(&s_shared_lock);

	return ret;
}

/*
 * ntfs_put_shared
 *
 * Return:
 * * @ptr - If pointer is not shared anymore.
 * * NULL - If pointer is still shared.
 */
void *ntfs_put_shared(void *ptr)
{
	void *ret = ptr;
	int i;

	spin_lock(&s_shared_lock);
	for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
		if (s_shared[i].cnt && s_shared[i].ptr == ptr) {
			if (--s_shared[i].cnt)
				ret = NULL;
			break;
		}
	}
	spin_unlock(&s_shared_lock);

	return ret;
}

static inline void put_mount_options(struct ntfs_mount_options *options)
{
	kfree(options->nls_name);
	unload_nls(options->nls);
	kfree(options);
}

enum Opt {
	Opt_uid,
	Opt_gid,
	Opt_umask,
	Opt_dmask,
	Opt_fmask,
	Opt_immutable,
	Opt_discard,
	Opt_force,
	Opt_sparse,
	Opt_nohidden,
	Opt_hide_dot_files,
	Opt_windows_names,
	Opt_showmeta,
	Opt_acl,
	Opt_iocharset,
	Opt_prealloc,
	Opt_nocase,
	Opt_err,
};

// clang-format off
static const struct fs_parameter_spec ntfs_fs_parameters[] = {
	fsparam_u32("uid",			Opt_uid),
	fsparam_u32("gid",			Opt_gid),
	fsparam_u32oct("umask",			Opt_umask),
	fsparam_u32oct("dmask",			Opt_dmask),
	fsparam_u32oct("fmask",			Opt_fmask),
	fsparam_flag_no("sys_immutable",	Opt_immutable),
	fsparam_flag_no("discard",		Opt_discard),
	fsparam_flag_no("force",		Opt_force),
	fsparam_flag_no("sparse",		Opt_sparse),
	fsparam_flag_no("hidden",		Opt_nohidden),
	fsparam_flag_no("hide_dot_files",	Opt_hide_dot_files),
	fsparam_flag_no("windows_names",	Opt_windows_names),
	fsparam_flag_no("showmeta",		Opt_showmeta),
	fsparam_flag_no("acl",			Opt_acl),
	fsparam_string("iocharset",		Opt_iocharset),
	fsparam_flag_no("prealloc",		Opt_prealloc),
	fsparam_flag_no("nocase",		Opt_nocase),
	{}
};
// clang-format on

/*
 * Load nls table or if @nls is utf8 then return NULL.
 *
 * It is good idea to use here "const char *nls".
 * But load_nls accepts "char*".
 */
static struct nls_table *ntfs_load_nls(char *nls)
{
	struct nls_table *ret;

	if (!nls)
		nls = CONFIG_NLS_DEFAULT;

	if (strcmp(nls, "utf8") == 0)
		return NULL;

	if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0)
		return load_nls_default();

	ret = load_nls(nls);
	if (ret)
		return ret;

	return ERR_PTR(-EINVAL);
}

static int ntfs_fs_parse_param(struct fs_context *fc,
			       struct fs_parameter *param)
{
	struct ntfs_mount_options *opts = fc->fs_private;
	struct fs_parse_result result;
	int opt;

	opt = fs_parse(fc, ntfs_fs_parameters, param, &result);
	if (opt < 0)
		return opt;

	switch (opt) {
	case Opt_uid:
		opts->fs_uid = make_kuid(current_user_ns(), result.uint_32);
		if (!uid_valid(opts->fs_uid))
			return invalf(fc, "ntfs3: Invalid value for uid.");
		break;
	case Opt_gid:
		opts->fs_gid = make_kgid(current_user_ns(), result.uint_32);
		if (!gid_valid(opts->fs_gid))
			return invalf(fc, "ntfs3: Invalid value for gid.");
		break;
	case Opt_umask:
		if (result.uint_32 & ~07777)
			return invalf(fc, "ntfs3: Invalid value for umask.");
		opts->fs_fmask_inv = ~result.uint_32;
		opts->fs_dmask_inv = ~result.uint_32;
		opts->fmask = 1;
		opts->dmask = 1;
		break;
	case Opt_dmask:
		if (result.uint_32 & ~07777)
			return invalf(fc, "ntfs3: Invalid value for dmask.");
		opts->fs_dmask_inv = ~result.uint_32;
		opts->dmask = 1;
		break;
	case Opt_fmask:
		if (result.uint_32 & ~07777)
			return invalf(fc, "ntfs3: Invalid value for fmask.");
		opts->fs_fmask_inv = ~result.uint_32;
		opts->fmask = 1;
		break;
	case Opt_immutable:
		opts->sys_immutable = result.negated ? 0 : 1;
		break;
	case Opt_discard:
		opts->discard = result.negated ? 0 : 1;
		break;
	case Opt_force:
		opts->force = result.negated ? 0 : 1;
		break;
	case Opt_sparse:
		opts->sparse = result.negated ? 0 : 1;
		break;
	case Opt_nohidden:
		opts->nohidden = result.negated ? 1 : 0;
		break;
	case Opt_hide_dot_files:
		opts->hide_dot_files = result.negated ? 0 : 1;
		break;
	case Opt_windows_names:
		opts->windows_names = result.negated ? 0 : 1;
		break;
	case Opt_showmeta:
		opts->showmeta = result.negated ? 0 : 1;
		break;
	case Opt_acl:
		if (!result.negated)
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
			fc->sb_flags |= SB_POSIXACL;
#else
			return invalf(
				fc, "ntfs3: Support for ACL not compiled in!");
#endif
		else
			fc->sb_flags &= ~SB_POSIXACL;
		break;
	case Opt_iocharset:
		kfree(opts->nls_name);
		opts->nls_name = param->string;
		param->string = NULL;
		break;
	case Opt_prealloc:
		opts->prealloc = result.negated ? 0 : 1;
		break;
	case Opt_nocase:
		opts->nocase = result.negated ? 1 : 0;
		break;
	default:
		/* Should not be here unless we forget add case. */
		return -EINVAL;
	}
	return 0;
}

static int ntfs_fs_reconfigure(struct fs_context *fc)
{
	struct super_block *sb = fc->root->d_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct ntfs_mount_options *new_opts = fc->fs_private;
	int ro_rw;

	ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY);
	if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) {
		errorf(fc,
		       "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n");
		return -EINVAL;
	}

	new_opts->nls = ntfs_load_nls(new_opts->nls_name);
	if (IS_ERR(new_opts->nls)) {
		new_opts->nls = NULL;
		errorf(fc, "ntfs3: Cannot load iocharset %s",
		       new_opts->nls_name);
		return -EINVAL;
	}
	if (new_opts->nls != sbi->options->nls)
		return invalf(
			fc,
			"ntfs3: Cannot use different iocharset when remounting!");

	sync_filesystem(sb);

	if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) &&
	    !new_opts->force) {
		errorf(fc,
		       "ntfs3: Volume is dirty and \"force\" flag is not set!");
		return -EINVAL;
	}

	swap(sbi->options, fc->fs_private);

	return 0;
}

#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_info_root;

/*
 * ntfs3_volinfo:
 *
 * The content of /proc/fs/ntfs3/<dev>/volinfo
 *
 * ntfs3.1
 * cluster size
 * number of clusters
 * total number of mft records
 * number of used mft records ~= number of files + folders
 * real state of ntfs "dirty"/"clean"
 * current state of ntfs "dirty"/"clean"
*/
static int ntfs3_volinfo(struct seq_file *m, void *o)
{
	struct super_block *sb = m->private;
	struct ntfs_sb_info *sbi = sb->s_fs_info;

	seq_printf(m, "ntfs%d.%d\n%u\n%zu\n\%zu\n%zu\n%s\n%s\n",
		   sbi->volume.major_ver, sbi->volume.minor_ver,
		   sbi->cluster_size, sbi->used.bitmap.nbits,
		   sbi->mft.bitmap.nbits,
		   sbi->mft.bitmap.nbits - wnd_zeroes(&sbi->mft.bitmap),
		   sbi->volume.real_dirty ? "dirty" : "clean",
		   (sbi->volume.flags & VOLUME_FLAG_DIRTY) ? "dirty" : "clean");

	return 0;
}

static int ntfs3_volinfo_open(struct inode *inode, struct file *file)
{
	return single_open(file, ntfs3_volinfo, pde_data(inode));
}

/* read /proc/fs/ntfs3/<dev>/label */
static int ntfs3_label_show(struct seq_file *m, void *o)
{
	struct super_block *sb = m->private;
	struct ntfs_sb_info *sbi = sb->s_fs_info;

	seq_printf(m, "%s\n", sbi->volume.label);

	return 0;
}

/* write /proc/fs/ntfs3/<dev>/label */
static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer,
				 size_t count, loff_t *ppos)
{
	int err;
	struct super_block *sb = pde_data(file_inode(file));
	ssize_t ret = count;
	u8 *label;

	if (sb_rdonly(sb))
		return -EROFS;

	label = kmalloc(count, GFP_NOFS);

	if (!label)
		return -ENOMEM;

	if (copy_from_user(label, buffer, ret)) {
		ret = -EFAULT;
		goto out;
	}
	while (ret > 0 && label[ret - 1] == '\n')
		ret -= 1;

	err = ntfs_set_label(sb->s_fs_info, label, ret);

	if (err < 0) {
		ntfs_err(sb, "failed (%d) to write label", err);
		ret = err;
		goto out;
	}

	*ppos += count;
	ret = count;
out:
	kfree(label);
	return ret;
}

static int ntfs3_label_open(struct inode *inode, struct file *file)
{
	return single_open(file, ntfs3_label_show, pde_data(inode));
}

static const struct proc_ops ntfs3_volinfo_fops = {
	.proc_read = seq_read,
	.proc_lseek = seq_lseek,
	.proc_release = single_release,
	.proc_open = ntfs3_volinfo_open,
};

static const struct proc_ops ntfs3_label_fops = {
	.proc_read = seq_read,
	.proc_lseek = seq_lseek,
	.proc_release = single_release,
	.proc_open = ntfs3_label_open,
	.proc_write = ntfs3_label_write,
};

#endif

static struct kmem_cache *ntfs_inode_cachep;

static struct inode *ntfs_alloc_inode(struct super_block *sb)
{
	struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS);

	if (!ni)
		return NULL;

	memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode));
	mutex_init(&ni->ni_lock);
	return &ni->vfs_inode;
}

static void ntfs_free_inode(struct inode *inode)
{
	struct ntfs_inode *ni = ntfs_i(inode);

	mutex_destroy(&ni->ni_lock);
	kmem_cache_free(ntfs_inode_cachep, ni);
}

static void init_once(void *foo)
{
	struct ntfs_inode *ni = foo;

	inode_init_once(&ni->vfs_inode);
}

/*
 * Noinline to reduce binary size.
 */
static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi)
{
	wnd_close(&sbi->mft.bitmap);
	wnd_close(&sbi->used.bitmap);

	if (sbi->mft.ni) {
		iput(&sbi->mft.ni->vfs_inode);
		sbi->mft.ni = NULL;
	}

	if (sbi->security.ni) {
		iput(&sbi->security.ni->vfs_inode);
		sbi->security.ni = NULL;
	}

	if (sbi->reparse.ni) {
		iput(&sbi->reparse.ni->vfs_inode);
		sbi->reparse.ni = NULL;
	}

	if (sbi->objid.ni) {
		iput(&sbi->objid.ni->vfs_inode);
		sbi->objid.ni = NULL;
	}

	if (sbi->volume.ni) {
		iput(&sbi->volume.ni->vfs_inode);
		sbi->volume.ni = NULL;
	}

	ntfs_update_mftmirr(sbi, 0);

	indx_clear(&sbi->security.index_sii);
	indx_clear(&sbi->security.index_sdh);
	indx_clear(&sbi->reparse.index_r);
	indx_clear(&sbi->objid.index_o);
}

static void ntfs3_free_sbi(struct ntfs_sb_info *sbi)
{
	kfree(sbi->new_rec);
	kvfree(ntfs_put_shared(sbi->upcase));
	kvfree(sbi->def_table);
	kfree(sbi->compress.lznt);
#ifdef CONFIG_NTFS3_LZX_XPRESS
	xpress_free_decompressor(sbi->compress.xpress);
	lzx_free_decompressor(sbi->compress.lzx);
#endif
	kfree(sbi);
}

static void ntfs_put_super(struct super_block *sb)
{
	struct ntfs_sb_info *sbi = sb->s_fs_info;

#ifdef CONFIG_PROC_FS
	// Remove /proc/fs/ntfs3/..
	if (sbi->procdir) {
		remove_proc_entry("label", sbi->procdir);
		remove_proc_entry("volinfo", sbi->procdir);
		remove_proc_entry(sb->s_id, proc_info_root);
		sbi->procdir = NULL;
	}
#endif

	/* Mark rw ntfs as clear, if possible. */
	ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
	ntfs3_put_sbi(sbi);
}

static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct wnd_bitmap *wnd = &sbi->used.bitmap;

	buf->f_type = sb->s_magic;
	buf->f_bsize = sbi->cluster_size;
	buf->f_blocks = wnd->nbits;

	buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd);
	buf->f_fsid.val[0] = sbi->volume.ser_num;
	buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32);
	buf->f_namelen = NTFS_NAME_LEN;

	return 0;
}

static int ntfs_show_options(struct seq_file *m, struct dentry *root)
{
	struct super_block *sb = root->d_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct ntfs_mount_options *opts = sbi->options;
	struct user_namespace *user_ns = seq_user_ns(m);

	seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid));
	seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid));
	if (opts->dmask)
		seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff);
	if (opts->fmask)
		seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff);
	if (opts->sys_immutable)
		seq_puts(m, ",sys_immutable");
	if (opts->discard)
		seq_puts(m, ",discard");
	if (opts->force)
		seq_puts(m, ",force");
	if (opts->sparse)
		seq_puts(m, ",sparse");
	if (opts->nohidden)
		seq_puts(m, ",nohidden");
	if (opts->hide_dot_files)
		seq_puts(m, ",hide_dot_files");
	if (opts->windows_names)
		seq_puts(m, ",windows_names");
	if (opts->showmeta)
		seq_puts(m, ",showmeta");
	if (sb->s_flags & SB_POSIXACL)
		seq_puts(m, ",acl");
	if (opts->nls)
		seq_printf(m, ",iocharset=%s", opts->nls->charset);
	else
		seq_puts(m, ",iocharset=utf8");
	if (opts->prealloc)
		seq_puts(m, ",prealloc");
	if (opts->nocase)
		seq_puts(m, ",nocase");

	return 0;
}

/*
 * ntfs_shutdown - super_operations::shutdown
 */
static void ntfs_shutdown(struct super_block *sb)
{
	set_bit(NTFS_FLAGS_SHUTDOWN_BIT, &ntfs_sb(sb)->flags);
}

/*
 * ntfs_sync_fs - super_operations::sync_fs
 */
static int ntfs_sync_fs(struct super_block *sb, int wait)
{
	int err = 0, err2;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct ntfs_inode *ni;
	struct inode *inode;

	if (unlikely(ntfs3_forced_shutdown(sb)))
		return -EIO;

	ni = sbi->security.ni;
	if (ni) {
		inode = &ni->vfs_inode;
		err2 = _ni_write_inode(inode, wait);
		if (err2 && !err)
			err = err2;
	}

	ni = sbi->objid.ni;
	if (ni) {
		inode = &ni->vfs_inode;
		err2 = _ni_write_inode(inode, wait);
		if (err2 && !err)
			err = err2;
	}

	ni = sbi->reparse.ni;
	if (ni) {
		inode = &ni->vfs_inode;
		err2 = _ni_write_inode(inode, wait);
		if (err2 && !err)
			err = err2;
	}

	if (!err)
		ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);

	ntfs_update_mftmirr(sbi, wait);

	return err;
}

static const struct super_operations ntfs_sops = {
	.alloc_inode = ntfs_alloc_inode,
	.free_inode = ntfs_free_inode,
	.evict_inode = ntfs_evict_inode,
	.put_super = ntfs_put_super,
	.statfs = ntfs_statfs,
	.show_options = ntfs_show_options,
	.shutdown = ntfs_shutdown,
	.sync_fs = ntfs_sync_fs,
	.write_inode = ntfs3_write_inode,
};

static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino,
					   u32 generation)
{
	struct MFT_REF ref;
	struct inode *inode;

	ref.low = cpu_to_le32(ino);
#ifdef CONFIG_NTFS3_64BIT_CLUSTER
	ref.high = cpu_to_le16(ino >> 32);
#else
	ref.high = 0;
#endif
	ref.seq = cpu_to_le16(generation);

	inode = ntfs_iget5(sb, &ref, NULL);
	if (!IS_ERR(inode) && is_bad_inode(inode)) {
		iput(inode);
		inode = ERR_PTR(-ESTALE);
	}

	return inode;
}

static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
					int fh_len, int fh_type)
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
				    ntfs_export_get_inode);
}

static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
					int fh_len, int fh_type)
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ntfs_export_get_inode);
}

/* TODO: == ntfs_sync_inode */
static int ntfs_nfs_commit_metadata(struct inode *inode)
{
	return _ni_write_inode(inode, 1);
}

static const struct export_operations ntfs_export_ops = {
	.encode_fh = generic_encode_ino32_fh,
	.fh_to_dentry = ntfs_fh_to_dentry,
	.fh_to_parent = ntfs_fh_to_parent,
	.get_parent = ntfs3_get_parent,
	.commit_metadata = ntfs_nfs_commit_metadata,
};

/*
 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb".
 */
static u32 format_size_gb(const u64 bytes, u32 *mb)
{
	/* Do simple right 30 bit shift of 64 bit value. */
	u64 kbytes = bytes >> 10;
	u32 kbytes32 = kbytes;

	*mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20;
	if (*mb >= 100)
		*mb = 99;

	return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12);
}

static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot)
{
	if (boot->sectors_per_clusters <= 0x80)
		return boot->sectors_per_clusters;
	if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */
		return 1U << (-(s8)boot->sectors_per_clusters);
	return -EINVAL;
}

/*
 * ntfs_init_from_boot - Init internal info from on-disk boot sector.
 *
 * NTFS mount begins from boot - special formatted 512 bytes.
 * There are two boots: the first and the last 512 bytes of volume.
 * The content of boot is not changed during ntfs life.
 *
 * NOTE: ntfs.sys checks only first (primary) boot.
 * chkdsk checks both boots.
 */
static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
			       u64 dev_size, struct NTFS_BOOT **boot2)
{
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	int err;
	u32 mb, gb, boot_sector_size, sct_per_clst, record_size;
	u64 sectors, clusters, mlcn, mlcn2, dev_size0;
	struct NTFS_BOOT *boot;
	struct buffer_head *bh;
	struct MFT_REC *rec;
	u16 fn, ao;
	u8 cluster_bits;
	u32 boot_off = 0;
	sector_t boot_block = 0;
	const char *hint = "Primary boot";

	/* Save original dev_size. Used with alternative boot. */
	dev_size0 = dev_size;

	sbi->volume.blocks = dev_size >> PAGE_SHIFT;

read_boot:
	bh = ntfs_bread(sb, boot_block);
	if (!bh)
		return boot_block ? -EINVAL : -EIO;

	err = -EINVAL;

	/* Corrupted image; do not read OOB */
	if (bh->b_size - sizeof(*boot) < boot_off)
		goto out;

	boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off);

	if (memcmp(boot->system_id, "NTFS    ", sizeof("NTFS    ") - 1)) {
		ntfs_err(sb, "%s signature is not NTFS.", hint);
		goto out;
	}

	/* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/
	/*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1])
	 *	goto out;
	 */

	boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) |
			   boot->bytes_per_sector[0];
	if (boot_sector_size < SECTOR_SIZE ||
	    !is_power_of_2(boot_sector_size)) {
		ntfs_err(sb, "%s: invalid bytes per sector %u.", hint,
			 boot_sector_size);
		goto out;
	}

	/* cluster size: 512, 1K, 2K, 4K, ... 2M */
	sct_per_clst = true_sectors_per_clst(boot);
	if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) {
		ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint,
			 sct_per_clst);
		goto out;
	}

	sbi->cluster_size = boot_sector_size * sct_per_clst;
	sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size);
	sbi->cluster_mask = sbi->cluster_size - 1;
	sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask;

	mlcn = le64_to_cpu(boot->mft_clst);
	mlcn2 = le64_to_cpu(boot->mft2_clst);
	sectors = le64_to_cpu(boot->sectors_per_volume);

	if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) {
		ntfs_err(
			sb,
			"%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.",
			hint, mlcn, mlcn2, sectors);
		goto out;
	}

	if (boot->record_size >= 0) {
		record_size = (u32)boot->record_size << cluster_bits;
	} else if (-boot->record_size <= MAXIMUM_SHIFT_BYTES_PER_MFT) {
		record_size = 1u << (-boot->record_size);
	} else {
		ntfs_err(sb, "%s: invalid record size %d.", hint,
			 boot->record_size);
		goto out;
	}

	sbi->record_size = record_size;
	sbi->record_bits = blksize_bits(record_size);
	sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes

	/* Check MFT record size. */
	if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) {
		ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint,
			 record_size, boot->record_size);
		goto out;
	}

	if (record_size > MAXIMUM_BYTES_PER_MFT) {
		ntfs_err(sb, "Unsupported bytes per MFT record %u.",
			 record_size);
		goto out;
	}

	if (boot->index_size >= 0) {
		sbi->index_size = (u32)boot->index_size << cluster_bits;
	} else if (-boot->index_size <= MAXIMUM_SHIFT_BYTES_PER_INDEX) {
		sbi->index_size = 1u << (-boot->index_size);
	} else {
		ntfs_err(sb, "%s: invalid index size %d.", hint,
			 boot->index_size);
		goto out;
	}

	/* Check index record size. */
	if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) {
		ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint,
			 sbi->index_size, boot->index_size);
		goto out;
	}

	if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) {
		ntfs_err(sb, "%s: unsupported bytes per index %u.", hint,
			 sbi->index_size);
		goto out;
	}

	sbi->volume.size = sectors * boot_sector_size;

	gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb);

	/*
	 * - Volume formatted and mounted with the same sector size.
	 * - Volume formatted 4K and mounted as 512.
	 * - Volume formatted 512 and mounted as 4K.
	 */
	if (boot_sector_size != sector_size) {
		ntfs_warn(
			sb,
			"Different NTFS sector size (%u) and media sector size (%u).",
			boot_sector_size, sector_size);
		dev_size += sector_size - 1;
	}

	sbi->mft.lbo = mlcn << cluster_bits;
	sbi->mft.lbo2 = mlcn2 << cluster_bits;

	/* Compare boot's cluster and sector. */
	if (sbi->cluster_size < boot_sector_size) {
		ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint,
			 sbi->cluster_size);
		goto out;
	}

	/* Compare boot's cluster and media sector. */
	if (sbi->cluster_size < sector_size) {
		/* No way to use ntfs_get_block in this case. */
		ntfs_err(
			sb,
			"Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).",
			sbi->cluster_size, sector_size);
		goto out;
	}

	sbi->max_bytes_per_attr =
		record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) -
		ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) -
		ALIGN(sizeof(enum ATTR_TYPE), 8);

	sbi->volume.ser_num = le64_to_cpu(boot->serial_num);

	/* Warning if RAW volume. */
	if (dev_size < sbi->volume.size + boot_sector_size) {
		u32 mb0, gb0;

		gb0 = format_size_gb(dev_size, &mb0);
		ntfs_warn(
			sb,
			"RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.",
			gb, mb, gb0, mb0);
		sb->s_flags |= SB_RDONLY;
	}

	clusters = sbi->volume.size >> cluster_bits;
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
	/* 32 bits per cluster. */
	if (clusters >> 32) {
		ntfs_notice(
			sb,
			"NTFS %u.%02u Gb is too big to use 32 bits per cluster.",
			gb, mb);
		goto out;
	}
#elif BITS_PER_LONG < 64
#error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS"
#endif

	sbi->used.bitmap.nbits = clusters;

	rec = kzalloc(record_size, GFP_NOFS);
	if (!rec) {
		err = -ENOMEM;
		goto out;
	}

	sbi->new_rec = rec;
	rec->rhdr.sign = NTFS_FILE_SIGNATURE;
	rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET);
	fn = (sbi->record_size >> SECTOR_SHIFT) + 1;
	rec->rhdr.fix_num = cpu_to_le16(fn);
	ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8);
	rec->attr_off = cpu_to_le16(ao);
	rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8));
	rec->total = cpu_to_le32(sbi->record_size);
	((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END;

	sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE));

	sbi->block_mask = sb->s_blocksize - 1;
	sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits;
	sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits;

	/* Maximum size for normal files. */
	sbi->maxbytes = (clusters << cluster_bits) - 1;

#ifdef CONFIG_NTFS3_64BIT_CLUSTER
	if (clusters >= (1ull << (64 - cluster_bits)))
		sbi->maxbytes = -1;
	sbi->maxbytes_sparse = -1;
	sb->s_maxbytes = MAX_LFS_FILESIZE;
#else
	/* Maximum size for sparse file. */
	sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1;
	sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits;
#endif

	/*
	 * Compute the MFT zone at two steps.
	 * It would be nice if we are able to allocate 1/8 of
	 * total clusters for MFT but not more then 512 MB.
	 */
	sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3);

	err = 0;

	if (bh->b_blocknr && !sb_rdonly(sb)) {
		/*
	 	 * Alternative boot is ok but primary is not ok.
	 	 * Do not update primary boot here 'cause it may be faked boot.
	 	 * Let ntfs to be mounted and update boot later.
		 */
		*boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN);
	}

out:
	brelse(bh);

	if (err == -EINVAL && !boot_block && dev_size0 > PAGE_SHIFT) {
		u32 block_size = min_t(u32, sector_size, PAGE_SIZE);
		u64 lbo = dev_size0 - sizeof(*boot);

		boot_block = lbo >> blksize_bits(block_size);
		boot_off = lbo & (block_size - 1);
		if (boot_block && block_size >= boot_off + sizeof(*boot)) {
			/*
			 * Try alternative boot (last sector)
			 */
			sb_set_blocksize(sb, block_size);
			hint = "Alternative boot";
			dev_size = dev_size0; /* restore original size. */
			goto read_boot;
		}
	}

	return err;
}

/*
 * ntfs_fill_super - Try to mount.
 */
static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
{
	int err;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct block_device *bdev = sb->s_bdev;
	struct ntfs_mount_options *options;
	struct inode *inode;
	struct ntfs_inode *ni;
	size_t i, tt, bad_len, bad_frags;
	CLST vcn, lcn, len;
	struct ATTRIB *attr;
	const struct VOLUME_INFO *info;
	u32 idx, done, bytes;
	struct ATTR_DEF_ENTRY *t;
	u16 *shared;
	struct MFT_REF ref;
	bool ro = sb_rdonly(sb);
	struct NTFS_BOOT *boot2 = NULL;

	ref.high = 0;

	sbi->sb = sb;
	sbi->options = options = fc->fs_private;
	fc->fs_private = NULL;
	sb->s_flags |= SB_NODIRATIME;
	sb->s_magic = 0x7366746e; // "ntfs"
	sb->s_op = &ntfs_sops;
	sb->s_export_op = &ntfs_export_ops;
	sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec
	sb->s_xattr = ntfs_xattr_handlers;
	sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL;

	options->nls = ntfs_load_nls(options->nls_name);
	if (IS_ERR(options->nls)) {
		options->nls = NULL;
		errorf(fc, "Cannot load nls %s", options->nls_name);
		err = -EINVAL;
		goto out;
	}

	if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) {
		sbi->discard_granularity = bdev_discard_granularity(bdev);
		sbi->discard_granularity_mask_inv =
			~(u64)(sbi->discard_granularity - 1);
	}

	/* Parse boot. */
	err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev),
				  bdev_nr_bytes(bdev), &boot2);
	if (err)
		goto out;

	/*
	 * Load $Volume. This should be done before $LogFile
	 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'.
	 */
	ref.low = cpu_to_le32(MFT_REC_VOL);
	ref.seq = cpu_to_le16(MFT_REC_VOL);
	inode = ntfs_iget5(sb, &ref, &NAME_VOLUME);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load $Volume (%d).", err);
		goto out;
	}

	ni = ntfs_i(inode);

	/* Load and save label (not necessary). */
	attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL);

	if (!attr) {
		/* It is ok if no ATTR_LABEL */
	} else if (!attr->non_res && !is_attr_ext(attr)) {
		/* $AttrDef allows labels to be up to 128 symbols. */
		err = utf16s_to_utf8s(resident_data(attr),
				      le32_to_cpu(attr->res.data_size) >> 1,
				      UTF16_LITTLE_ENDIAN, sbi->volume.label,
				      sizeof(sbi->volume.label));
		if (err < 0)
			sbi->volume.label[0] = 0;
	} else {
		/* Should we break mounting here? */
		//err = -EINVAL;
		//goto put_inode_out;
	}

	attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL);
	if (!attr || is_attr_ext(attr) ||
	    !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) {
		ntfs_err(sb, "$Volume is corrupted.");
		err = -EINVAL;
		goto put_inode_out;
	}

	sbi->volume.major_ver = info->major_ver;
	sbi->volume.minor_ver = info->minor_ver;
	sbi->volume.flags = info->flags;
	sbi->volume.ni = ni;
	if (info->flags & VOLUME_FLAG_DIRTY) {
		sbi->volume.real_dirty = true;
		ntfs_info(sb, "It is recommened to use chkdsk.");
	}

	/* Load $MFTMirr to estimate recs_mirr. */
	ref.low = cpu_to_le32(MFT_REC_MIRR);
	ref.seq = cpu_to_le16(MFT_REC_MIRR);
	inode = ntfs_iget5(sb, &ref, &NAME_MIRROR);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load $MFTMirr (%d).", err);
		goto out;
	}

	sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >>
			     sbi->record_bits;

	iput(inode);

	/* Load LogFile to replay. */
	ref.low = cpu_to_le32(MFT_REC_LOG);
	ref.seq = cpu_to_le16(MFT_REC_LOG);
	inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load \x24LogFile (%d).", err);
		goto out;
	}

	ni = ntfs_i(inode);

	err = ntfs_loadlog_and_replay(ni, sbi);
	if (err)
		goto put_inode_out;

	iput(inode);

	if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) {
		ntfs_warn(sb, "failed to replay log file. Can't mount rw!");
		err = -EINVAL;
		goto out;
	}

	if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) {
		ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!");
		err = -EINVAL;
		goto out;
	}

	/* Load $MFT. */
	ref.low = cpu_to_le32(MFT_REC_MFT);
	ref.seq = cpu_to_le16(1);

	inode = ntfs_iget5(sb, &ref, &NAME_MFT);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load $MFT (%d).", err);
		goto out;
	}

	ni = ntfs_i(inode);

	sbi->mft.used = ni->i_valid >> sbi->record_bits;
	tt = inode->i_size >> sbi->record_bits;
	sbi->mft.next_free = MFT_REC_USER;

	err = wnd_init(&sbi->mft.bitmap, sb, tt);
	if (err)
		goto put_inode_out;

	err = ni_load_all_mi(ni);
	if (err) {
		ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err);
		goto put_inode_out;
	}

	sbi->mft.ni = ni;

	/* Load $Bitmap. */
	ref.low = cpu_to_le32(MFT_REC_BITMAP);
	ref.seq = cpu_to_le16(MFT_REC_BITMAP);
	inode = ntfs_iget5(sb, &ref, &NAME_BITMAP);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load $Bitmap (%d).", err);
		goto out;
	}

#ifndef CONFIG_NTFS3_64BIT_CLUSTER
	if (inode->i_size >> 32) {
		err = -EINVAL;
		goto put_inode_out;
	}
#endif

	/* Check bitmap boundary. */
	tt = sbi->used.bitmap.nbits;
	if (inode->i_size < bitmap_size(tt)) {
		ntfs_err(sb, "$Bitmap is corrupted.");
		err = -EINVAL;
		goto put_inode_out;
	}

	err = wnd_init(&sbi->used.bitmap, sb, tt);
	if (err) {
		ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err);
		goto put_inode_out;
	}

	iput(inode);

	/* Compute the MFT zone. */
	err = ntfs_refresh_zone(sbi);
	if (err) {
		ntfs_err(sb, "Failed to initialize MFT zone (%d).", err);
		goto out;
	}

	/* Load $BadClus. */
	ref.low = cpu_to_le32(MFT_REC_BADCLUST);
	ref.seq = cpu_to_le16(MFT_REC_BADCLUST);
	inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load $BadClus (%d).", err);
		goto out;
	}

	ni = ntfs_i(inode);
	bad_len = bad_frags = 0;
	for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) {
		if (lcn == SPARSE_LCN)
			continue;

		bad_len += len;
		bad_frags += 1;
		if (ro)
			continue;

		if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) {
			/* Bad blocks marked as free in bitmap. */
			ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
		}
	}
	if (bad_len) {
		/*
		 * Notice about bad blocks.
		 * In normal cases these blocks are marked as used in bitmap.
		 * And we never allocate space in it.
		 */
		ntfs_notice(sb,
			    "Volume contains %zu bad blocks in %zu fragments.",
			    bad_len, bad_frags);
	}
	iput(inode);

	/* Load $AttrDef. */
	ref.low = cpu_to_le32(MFT_REC_ATTR);
	ref.seq = cpu_to_le16(MFT_REC_ATTR);
	inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load $AttrDef (%d)", err);
		goto out;
	}

	/*
	 * Typical $AttrDef contains up to 20 entries.
	 * Check for extremely large/small size.
	 */
	if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) ||
	    inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) {
		ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).",
			 inode->i_size);
		err = -EINVAL;
		goto put_inode_out;
	}

	bytes = inode->i_size;
	sbi->def_table = t = kvmalloc(bytes, GFP_KERNEL);
	if (!t) {
		err = -ENOMEM;
		goto put_inode_out;
	}

	for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) {
		unsigned long tail = bytes - done;
		struct page *page = ntfs_map_page(inode->i_mapping, idx);

		if (IS_ERR(page)) {
			err = PTR_ERR(page);
			ntfs_err(sb, "Failed to read $AttrDef (%d).", err);
			goto put_inode_out;
		}
		memcpy(Add2Ptr(t, done), page_address(page),
		       min(PAGE_SIZE, tail));
		ntfs_unmap_page(page);

		if (!idx && ATTR_STD != t->type) {
			ntfs_err(sb, "$AttrDef is corrupted.");
			err = -EINVAL;
			goto put_inode_out;
		}
	}

	t += 1;
	sbi->def_entries = 1;
	done = sizeof(struct ATTR_DEF_ENTRY);
	sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE;
	sbi->ea_max_size = 0x10000; /* default formatter value */

	while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) {
		u32 t32 = le32_to_cpu(t->type);
		u64 sz = le64_to_cpu(t->max_sz);

		if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32)
			break;

		if (t->type == ATTR_REPARSE)
			sbi->reparse.max_size = sz;
		else if (t->type == ATTR_EA)
			sbi->ea_max_size = sz;

		done += sizeof(struct ATTR_DEF_ENTRY);
		t += 1;
		sbi->def_entries += 1;
	}
	iput(inode);

	/* Load $UpCase. */
	ref.low = cpu_to_le32(MFT_REC_UPCASE);
	ref.seq = cpu_to_le16(MFT_REC_UPCASE);
	inode = ntfs_iget5(sb, &ref, &NAME_UPCASE);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load $UpCase (%d).", err);
		goto out;
	}

	if (inode->i_size != 0x10000 * sizeof(short)) {
		err = -EINVAL;
		ntfs_err(sb, "$UpCase is corrupted.");
		goto put_inode_out;
	}

	for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) {
		const __le16 *src;
		u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT);
		struct page *page = ntfs_map_page(inode->i_mapping, idx);

		if (IS_ERR(page)) {
			err = PTR_ERR(page);
			ntfs_err(sb, "Failed to read $UpCase (%d).", err);
			goto put_inode_out;
		}

		src = page_address(page);

#ifdef __BIG_ENDIAN
		for (i = 0; i < PAGE_SIZE / sizeof(u16); i++)
			*dst++ = le16_to_cpu(*src++);
#else
		memcpy(dst, src, PAGE_SIZE);
#endif
		ntfs_unmap_page(page);
	}

	shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short));
	if (shared && sbi->upcase != shared) {
		kvfree(sbi->upcase);
		sbi->upcase = shared;
	}

	iput(inode);

	if (is_ntfs3(sbi)) {
		/* Load $Secure. */
		err = ntfs_security_init(sbi);
		if (err) {
			ntfs_err(sb, "Failed to initialize $Secure (%d).", err);
			goto out;
		}

		/* Load $Extend. */
		err = ntfs_extend_init(sbi);
		if (err) {
			ntfs_warn(sb, "Failed to initialize $Extend.");
			goto load_root;
		}

		/* Load $Extend/$Reparse. */
		err = ntfs_reparse_init(sbi);
		if (err) {
			ntfs_warn(sb, "Failed to initialize $Extend/$Reparse.");
			goto load_root;
		}

		/* Load $Extend/$ObjId. */
		err = ntfs_objid_init(sbi);
		if (err) {
			ntfs_warn(sb, "Failed to initialize $Extend/$ObjId.");
			goto load_root;
		}
	}

load_root:
	/* Load root. */
	ref.low = cpu_to_le32(MFT_REC_ROOT);
	ref.seq = cpu_to_le16(MFT_REC_ROOT);
	inode = ntfs_iget5(sb, &ref, &NAME_ROOT);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		ntfs_err(sb, "Failed to load root (%d).", err);
		goto out;
	}

	/*
	 * Final check. Looks like this case should never occurs.
	 */
	if (!inode->i_op) {
		err = -EINVAL;
		ntfs_err(sb, "Failed to load root (%d).", err);
		goto put_inode_out;
	}

	sb->s_root = d_make_root(inode);
	if (!sb->s_root) {
		err = -ENOMEM;
		goto put_inode_out;
	}

	if (boot2) {
		/*
	 	 * Alternative boot is ok but primary is not ok.
	 	 * Volume is recognized as NTFS. Update primary boot.
		 */
		struct buffer_head *bh0 = sb_getblk(sb, 0);
		if (bh0) {
			if (buffer_locked(bh0))
				__wait_on_buffer(bh0);

			lock_buffer(bh0);
			memcpy(bh0->b_data, boot2, sizeof(*boot2));
			set_buffer_uptodate(bh0);
			mark_buffer_dirty(bh0);
			unlock_buffer(bh0);
			if (!sync_dirty_buffer(bh0))
				ntfs_warn(sb, "primary boot is updated");
			put_bh(bh0);
		}

		kfree(boot2);
	}

#ifdef CONFIG_PROC_FS
	/* Create /proc/fs/ntfs3/.. */
	if (proc_info_root) {
		struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root);
		static_assert((S_IRUGO | S_IWUSR) == 0644);
		if (e) {
			proc_create_data("volinfo", S_IRUGO, e,
					 &ntfs3_volinfo_fops, sb);
			proc_create_data("label", S_IRUGO | S_IWUSR, e,
					 &ntfs3_label_fops, sb);
			sbi->procdir = e;
		}
	}
#endif

	return 0;

put_inode_out:
	iput(inode);
out:
	ntfs3_put_sbi(sbi);
	kfree(boot2);
	ntfs3_put_sbi(sbi);
	return err;
}

void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len)
{
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct block_device *bdev = sb->s_bdev;
	sector_t devblock = (u64)lcn * sbi->blocks_per_cluster;
	unsigned long blocks = (u64)len * sbi->blocks_per_cluster;
	unsigned long cnt = 0;
	unsigned long limit = global_zone_page_state(NR_FREE_PAGES)
			      << (PAGE_SHIFT - sb->s_blocksize_bits);

	if (limit >= 0x2000)
		limit -= 0x1000;
	else if (limit < 32)
		limit = 32;
	else
		limit >>= 1;

	while (blocks--) {
		clean_bdev_aliases(bdev, devblock++, 1);
		if (cnt++ >= limit) {
			sync_blockdev(bdev);
			cnt = 0;
		}
	}
}

/*
 * ntfs_discard - Issue a discard request (trim for SSD).
 */
int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len)
{
	int err;
	u64 lbo, bytes, start, end;
	struct super_block *sb;

	if (sbi->used.next_free_lcn == lcn + len)
		sbi->used.next_free_lcn = lcn;

	if (sbi->flags & NTFS_FLAGS_NODISCARD)
		return -EOPNOTSUPP;

	if (!sbi->options->discard)
		return -EOPNOTSUPP;

	lbo = (u64)lcn << sbi->cluster_bits;
	bytes = (u64)len << sbi->cluster_bits;

	/* Align up 'start' on discard_granularity. */
	start = (lbo + sbi->discard_granularity - 1) &
		sbi->discard_granularity_mask_inv;
	/* Align down 'end' on discard_granularity. */
	end = (lbo + bytes) & sbi->discard_granularity_mask_inv;

	sb = sbi->sb;
	if (start >= end)
		return 0;

	err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9,
				   GFP_NOFS);

	if (err == -EOPNOTSUPP)
		sbi->flags |= NTFS_FLAGS_NODISCARD;

	return err;
}

static int ntfs_fs_get_tree(struct fs_context *fc)
{
	return get_tree_bdev(fc, ntfs_fill_super);
}

/*
 * ntfs_fs_free - Free fs_context.
 *
 * Note that this will be called after fill_super and reconfigure
 * even when they pass. So they have to take pointers if they pass.
 */
static void ntfs_fs_free(struct fs_context *fc)
{
	struct ntfs_mount_options *opts = fc->fs_private;
	struct ntfs_sb_info *sbi = fc->s_fs_info;

	if (sbi) {
		ntfs3_put_sbi(sbi);
		ntfs3_free_sbi(sbi);
	}

	if (opts)
		put_mount_options(opts);
}

// clang-format off
static const struct fs_context_operations ntfs_context_ops = {
	.parse_param	= ntfs_fs_parse_param,
	.get_tree	= ntfs_fs_get_tree,
	.reconfigure	= ntfs_fs_reconfigure,
	.free		= ntfs_fs_free,
};
// clang-format on

/*
 * ntfs_init_fs_context - Initialize sbi and opts
 *
 * This will called when mount/remount. We will first initialize
 * options so that if remount we can use just that.
 */
static int ntfs_init_fs_context(struct fs_context *fc)
{
	struct ntfs_mount_options *opts;
	struct ntfs_sb_info *sbi;

	opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS);
	if (!opts)
		return -ENOMEM;

	/* Default options. */
	opts->fs_uid = current_uid();
	opts->fs_gid = current_gid();
	opts->fs_fmask_inv = ~current_umask();
	opts->fs_dmask_inv = ~current_umask();

	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
		goto ok;

	sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS);
	if (!sbi)
		goto free_opts;

	sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL);
	if (!sbi->upcase)
		goto free_sbi;

	ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL,
			     DEFAULT_RATELIMIT_BURST);

	mutex_init(&sbi->compress.mtx_lznt);
#ifdef CONFIG_NTFS3_LZX_XPRESS
	mutex_init(&sbi->compress.mtx_xpress);
	mutex_init(&sbi->compress.mtx_lzx);
#endif

	fc->s_fs_info = sbi;
ok:
	fc->fs_private = opts;
	fc->ops = &ntfs_context_ops;

	return 0;
free_sbi:
	kfree(sbi);
free_opts:
	kfree(opts);
	return -ENOMEM;
}

static void ntfs3_kill_sb(struct super_block *sb)
{
	struct ntfs_sb_info *sbi = sb->s_fs_info;

	kill_block_super(sb);

	if (sbi->options)
		put_mount_options(sbi->options);
	ntfs3_free_sbi(sbi);
}

// clang-format off
static struct file_system_type ntfs_fs_type = {
	.owner			= THIS_MODULE,
	.name			= "ntfs3",
	.init_fs_context	= ntfs_init_fs_context,
	.parameters		= ntfs_fs_parameters,
	.kill_sb		= ntfs3_kill_sb,
	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
};
// clang-format on

static int __init init_ntfs_fs(void)
{
	int err;

	if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL))
		pr_info("ntfs3: Enabled Linux POSIX ACLs support\n");
	if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER))
		pr_notice(
			"ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n");
	if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS))
		pr_info("ntfs3: Read-only LZX/Xpress compression included\n");

#ifdef CONFIG_PROC_FS
	/* Create "/proc/fs/ntfs3" */
	proc_info_root = proc_mkdir("fs/ntfs3", NULL);
#endif

	err = ntfs3_init_bitmap();
	if (err)
		return err;

	ntfs_inode_cachep = kmem_cache_create(
		"ntfs_inode_cache", sizeof(struct ntfs_inode), 0,
		(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
		init_once);
	if (!ntfs_inode_cachep) {
		err = -ENOMEM;
		goto out1;
	}

	err = register_filesystem(&ntfs_fs_type);
	if (err)
		goto out;

	return 0;
out:
	kmem_cache_destroy(ntfs_inode_cachep);
out1:
	ntfs3_exit_bitmap();
	return err;
}

static void __exit exit_ntfs_fs(void)
{
	rcu_barrier();
	kmem_cache_destroy(ntfs_inode_cachep);
	unregister_filesystem(&ntfs_fs_type);
	ntfs3_exit_bitmap();

#ifdef CONFIG_PROC_FS
	if (proc_info_root)
		remove_proc_entry("fs/ntfs3", NULL);
#endif
}

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ntfs3 read/write filesystem");
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support");
#endif
#ifdef CONFIG_NTFS3_64BIT_CLUSTER
MODULE_INFO(
	cluster,
	"Warning: Activated 64 bits per cluster. Windows does not support this");
#endif
#ifdef CONFIG_NTFS3_LZX_XPRESS
MODULE_INFO(compression, "Read-only lzx/xpress compression included");
#endif

MODULE_AUTHOR("Konstantin Komarov");
MODULE_ALIAS_FS("ntfs3");

module_init(init_ntfs_fs);
module_exit(exit_ntfs_fs);