summaryrefslogtreecommitdiff
path: root/fs/udf/super.c
blob: 5e03592369d773753d203accd02804a0f54427b4 (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
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
/*
 * super.c
 *
 * PURPOSE
 *  Super block routines for the OSTA-UDF(tm) filesystem.
 *
 * DESCRIPTION
 *  OSTA-UDF(tm) = Optical Storage Technology Association
 *  Universal Disk Format.
 *
 *  This code is based on version 2.00 of the UDF specification,
 *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
 *    http://www.osta.org/
 *    http://www.ecma.ch/
 *    http://www.iso.org/
 *
 * COPYRIGHT
 *  This file is distributed under the terms of the GNU General Public
 *  License (GPL). Copies of the GPL can be obtained from:
 *    ftp://prep.ai.mit.edu/pub/gnu/GPL
 *  Each contributing author retains all rights to their own work.
 *
 *  (C) 1998 Dave Boynton
 *  (C) 1998-2004 Ben Fennema
 *  (C) 2000 Stelias Computing Inc
 *
 * HISTORY
 *
 *  09/24/98 dgb  changed to allow compiling outside of kernel, and
 *                added some debugging.
 *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
 *  10/16/98      attempting some multi-session support
 *  10/17/98      added freespace count for "df"
 *  11/11/98 gr   added novrs option
 *  11/26/98 dgb  added fileset,anchor mount options
 *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
 *                vol descs. rewrote option handling based on isofs
 *  12/20/98      find the free space bitmap (if it exists)
 */

#include "udfdecl.h"

#include <linux/blkdev.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/stat.h>
#include <linux/cdrom.h>
#include <linux/nls.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/mount.h>
#include <linux/quotaops.h>
#include <linux/seq_file.h>
#include <linux/bitmap.h>
#include <linux/crc-itu-t.h>
#include <asm/byteorder.h>

#include "udf_sb.h"
#include "udf_i.h"

#include <linux/init.h>
#include <asm/uaccess.h>

#define VDS_POS_PRIMARY_VOL_DESC	0
#define VDS_POS_UNALLOC_SPACE_DESC	1
#define VDS_POS_LOGICAL_VOL_DESC	2
#define VDS_POS_PARTITION_DESC		3
#define VDS_POS_IMP_USE_VOL_DESC	4
#define VDS_POS_VOL_DESC_PTR		5
#define VDS_POS_TERMINATING_DESC	6
#define VDS_POS_LENGTH			7

#define UDF_DEFAULT_BLOCKSIZE 2048

static char error_buf[1024];

/* These are the "meat" - everything else is stuffing */
static int udf_fill_super(struct super_block *, void *, int);
static void udf_put_super(struct super_block *);
static int udf_sync_fs(struct super_block *, int);
static int udf_remount_fs(struct super_block *, int *, char *);
static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
			    struct kernel_lb_addr *);
static void udf_load_fileset(struct super_block *, struct buffer_head *,
			     struct kernel_lb_addr *);
static void udf_open_lvid(struct super_block *);
static void udf_close_lvid(struct super_block *);
static unsigned int udf_count_free(struct super_block *);
static int udf_statfs(struct dentry *, struct kstatfs *);
static int udf_show_options(struct seq_file *, struct vfsmount *);
static void udf_error(struct super_block *sb, const char *function,
		      const char *fmt, ...);

struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
{
	struct logicalVolIntegrityDesc *lvid =
		(struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
	__u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
	__u32 offset = number_of_partitions * 2 *
				sizeof(uint32_t)/sizeof(uint8_t);
	return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
}

/* UDF filesystem type */
static int udf_get_sb(struct file_system_type *fs_type,
		      int flags, const char *dev_name, void *data,
		      struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
}

static struct file_system_type udf_fstype = {
	.owner		= THIS_MODULE,
	.name		= "udf",
	.get_sb		= udf_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static struct kmem_cache *udf_inode_cachep;

static struct inode *udf_alloc_inode(struct super_block *sb)
{
	struct udf_inode_info *ei;
	ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;

	ei->i_unique = 0;
	ei->i_lenExtents = 0;
	ei->i_next_alloc_block = 0;
	ei->i_next_alloc_goal = 0;
	ei->i_strat4096 = 0;

	return &ei->vfs_inode;
}

static void udf_destroy_inode(struct inode *inode)
{
	kmem_cache_free(udf_inode_cachep, UDF_I(inode));
}

static void init_once(void *foo)
{
	struct udf_inode_info *ei = (struct udf_inode_info *)foo;

	ei->i_ext.i_data = NULL;
	inode_init_once(&ei->vfs_inode);
}

static int init_inodecache(void)
{
	udf_inode_cachep = kmem_cache_create("udf_inode_cache",
					     sizeof(struct udf_inode_info),
					     0, (SLAB_RECLAIM_ACCOUNT |
						 SLAB_MEM_SPREAD),
					     init_once);
	if (!udf_inode_cachep)
		return -ENOMEM;
	return 0;
}

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

/* Superblock operations */
static const struct super_operations udf_sb_ops = {
	.alloc_inode	= udf_alloc_inode,
	.destroy_inode	= udf_destroy_inode,
	.write_inode	= udf_write_inode,
	.delete_inode	= udf_delete_inode,
	.clear_inode	= udf_clear_inode,
	.put_super	= udf_put_super,
	.sync_fs	= udf_sync_fs,
	.statfs		= udf_statfs,
	.remount_fs	= udf_remount_fs,
	.show_options	= udf_show_options,
};

struct udf_options {
	unsigned char novrs;
	unsigned int blocksize;
	unsigned int session;
	unsigned int lastblock;
	unsigned int anchor;
	unsigned int volume;
	unsigned short partition;
	unsigned int fileset;
	unsigned int rootdir;
	unsigned int flags;
	mode_t umask;
	gid_t gid;
	uid_t uid;
	mode_t fmode;
	mode_t dmode;
	struct nls_table *nls_map;
};

static int __init init_udf_fs(void)
{
	int err;

	err = init_inodecache();
	if (err)
		goto out1;
	err = register_filesystem(&udf_fstype);
	if (err)
		goto out;

	return 0;

out:
	destroy_inodecache();

out1:
	return err;
}

static void __exit exit_udf_fs(void)
{
	unregister_filesystem(&udf_fstype);
	destroy_inodecache();
}

module_init(init_udf_fs)
module_exit(exit_udf_fs)

static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
{
	struct udf_sb_info *sbi = UDF_SB(sb);

	sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
				  GFP_KERNEL);
	if (!sbi->s_partmaps) {
		udf_error(sb, __func__,
			  "Unable to allocate space for %d partition maps",
			  count);
		sbi->s_partitions = 0;
		return -ENOMEM;
	}

	sbi->s_partitions = count;
	return 0;
}

static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
{
	struct super_block *sb = mnt->mnt_sb;
	struct udf_sb_info *sbi = UDF_SB(sb);

	if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
		seq_puts(seq, ",nostrict");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
		seq_printf(seq, ",bs=%lu", sb->s_blocksize);
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
		seq_puts(seq, ",unhide");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
		seq_puts(seq, ",undelete");
	if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
		seq_puts(seq, ",noadinicb");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
		seq_puts(seq, ",shortad");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
		seq_puts(seq, ",uid=forget");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
		seq_puts(seq, ",uid=ignore");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
		seq_puts(seq, ",gid=forget");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
		seq_puts(seq, ",gid=ignore");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
		seq_printf(seq, ",uid=%u", sbi->s_uid);
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
		seq_printf(seq, ",gid=%u", sbi->s_gid);
	if (sbi->s_umask != 0)
		seq_printf(seq, ",umask=%o", sbi->s_umask);
	if (sbi->s_fmode != UDF_INVALID_MODE)
		seq_printf(seq, ",mode=%o", sbi->s_fmode);
	if (sbi->s_dmode != UDF_INVALID_MODE)
		seq_printf(seq, ",dmode=%o", sbi->s_dmode);
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
		seq_printf(seq, ",session=%u", sbi->s_session);
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
		seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
	if (sbi->s_anchor != 0)
		seq_printf(seq, ",anchor=%u", sbi->s_anchor);
	/*
	 * volume, partition, fileset and rootdir seem to be ignored
	 * currently
	 */
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
		seq_puts(seq, ",utf8");
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
		seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);

	return 0;
}

/*
 * udf_parse_options
 *
 * PURPOSE
 *	Parse mount options.
 *
 * DESCRIPTION
 *	The following mount options are supported:
 *
 *	gid=		Set the default group.
 *	umask=		Set the default umask.
 *	mode=		Set the default file permissions.
 *	dmode=		Set the default directory permissions.
 *	uid=		Set the default user.
 *	bs=		Set the block size.
 *	unhide		Show otherwise hidden files.
 *	undelete	Show deleted files in lists.
 *	adinicb		Embed data in the inode (default)
 *	noadinicb	Don't embed data in the inode
 *	shortad		Use short ad's
 *	longad		Use long ad's (default)
 *	nostrict	Unset strict conformance
 *	iocharset=	Set the NLS character set
 *
 *	The remaining are for debugging and disaster recovery:
 *
 *	novrs		Skip volume sequence recognition
 *
 *	The following expect a offset from 0.
 *
 *	session=	Set the CDROM session (default= last session)
 *	anchor=		Override standard anchor location. (default= 256)
 *	volume=		Override the VolumeDesc location. (unused)
 *	partition=	Override the PartitionDesc location. (unused)
 *	lastblock=	Set the last block of the filesystem/
 *
 *	The following expect a offset from the partition root.
 *
 *	fileset=	Override the fileset block location. (unused)
 *	rootdir=	Override the root directory location. (unused)
 *		WARNING: overriding the rootdir to a non-directory may
 *		yield highly unpredictable results.
 *
 * PRE-CONDITIONS
 *	options		Pointer to mount options string.
 *	uopts		Pointer to mount options variable.
 *
 * POST-CONDITIONS
 *	<return>	1	Mount options parsed okay.
 *	<return>	0	Error parsing mount options.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */

enum {
	Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
	Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
	Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
	Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
	Opt_rootdir, Opt_utf8, Opt_iocharset,
	Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
	Opt_fmode, Opt_dmode
};

static const match_table_t tokens = {
	{Opt_novrs,	"novrs"},
	{Opt_nostrict,	"nostrict"},
	{Opt_bs,	"bs=%u"},
	{Opt_unhide,	"unhide"},
	{Opt_undelete,	"undelete"},
	{Opt_noadinicb,	"noadinicb"},
	{Opt_adinicb,	"adinicb"},
	{Opt_shortad,	"shortad"},
	{Opt_longad,	"longad"},
	{Opt_uforget,	"uid=forget"},
	{Opt_uignore,	"uid=ignore"},
	{Opt_gforget,	"gid=forget"},
	{Opt_gignore,	"gid=ignore"},
	{Opt_gid,	"gid=%u"},
	{Opt_uid,	"uid=%u"},
	{Opt_umask,	"umask=%o"},
	{Opt_session,	"session=%u"},
	{Opt_lastblock,	"lastblock=%u"},
	{Opt_anchor,	"anchor=%u"},
	{Opt_volume,	"volume=%u"},
	{Opt_partition,	"partition=%u"},
	{Opt_fileset,	"fileset=%u"},
	{Opt_rootdir,	"rootdir=%u"},
	{Opt_utf8,	"utf8"},
	{Opt_iocharset,	"iocharset=%s"},
	{Opt_fmode,     "mode=%o"},
	{Opt_dmode,     "dmode=%o"},
	{Opt_err,	NULL}
};

static int udf_parse_options(char *options, struct udf_options *uopt,
			     bool remount)
{
	char *p;
	int option;

	uopt->novrs = 0;
	uopt->partition = 0xFFFF;
	uopt->session = 0xFFFFFFFF;
	uopt->lastblock = 0;
	uopt->anchor = 0;
	uopt->volume = 0xFFFFFFFF;
	uopt->rootdir = 0xFFFFFFFF;
	uopt->fileset = 0xFFFFFFFF;
	uopt->nls_map = NULL;

	if (!options)
		return 1;

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

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_novrs:
			uopt->novrs = 1;
			break;
		case Opt_bs:
			if (match_int(&args[0], &option))
				return 0;
			uopt->blocksize = option;
			uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
			break;
		case Opt_unhide:
			uopt->flags |= (1 << UDF_FLAG_UNHIDE);
			break;
		case Opt_undelete:
			uopt->flags |= (1 << UDF_FLAG_UNDELETE);
			break;
		case Opt_noadinicb:
			uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
			break;
		case Opt_adinicb:
			uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
			break;
		case Opt_shortad:
			uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
			break;
		case Opt_longad:
			uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
			break;
		case Opt_gid:
			if (match_int(args, &option))
				return 0;
			uopt->gid = option;
			uopt->flags |= (1 << UDF_FLAG_GID_SET);
			break;
		case Opt_uid:
			if (match_int(args, &option))
				return 0;
			uopt->uid = option;
			uopt->flags |= (1 << UDF_FLAG_UID_SET);
			break;
		case Opt_umask:
			if (match_octal(args, &option))
				return 0;
			uopt->umask = option;
			break;
		case Opt_nostrict:
			uopt->flags &= ~(1 << UDF_FLAG_STRICT);
			break;
		case Opt_session:
			if (match_int(args, &option))
				return 0;
			uopt->session = option;
			if (!remount)
				uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
			break;
		case Opt_lastblock:
			if (match_int(args, &option))
				return 0;
			uopt->lastblock = option;
			if (!remount)
				uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
			break;
		case Opt_anchor:
			if (match_int(args, &option))
				return 0;
			uopt->anchor = option;
			break;
		case Opt_volume:
			if (match_int(args, &option))
				return 0;
			uopt->volume = option;
			break;
		case Opt_partition:
			if (match_int(args, &option))
				return 0;
			uopt->partition = option;
			break;
		case Opt_fileset:
			if (match_int(args, &option))
				return 0;
			uopt->fileset = option;
			break;
		case Opt_rootdir:
			if (match_int(args, &option))
				return 0;
			uopt->rootdir = option;
			break;
		case Opt_utf8:
			uopt->flags |= (1 << UDF_FLAG_UTF8);
			break;
#ifdef CONFIG_UDF_NLS
		case Opt_iocharset:
			uopt->nls_map = load_nls(args[0].from);
			uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
			break;
#endif
		case Opt_uignore:
			uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
			break;
		case Opt_uforget:
			uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
			break;
		case Opt_gignore:
			uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
			break;
		case Opt_gforget:
			uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
			break;
		case Opt_fmode:
			if (match_octal(args, &option))
				return 0;
			uopt->fmode = option & 0777;
			break;
		case Opt_dmode:
			if (match_octal(args, &option))
				return 0;
			uopt->dmode = option & 0777;
			break;
		default:
			printk(KERN_ERR "udf: bad mount option \"%s\" "
			       "or missing value\n", p);
			return 0;
		}
	}
	return 1;
}

static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
{
	struct udf_options uopt;
	struct udf_sb_info *sbi = UDF_SB(sb);
	int error = 0;

	uopt.flags = sbi->s_flags;
	uopt.uid   = sbi->s_uid;
	uopt.gid   = sbi->s_gid;
	uopt.umask = sbi->s_umask;
	uopt.fmode = sbi->s_fmode;
	uopt.dmode = sbi->s_dmode;

	if (!udf_parse_options(options, &uopt, true))
		return -EINVAL;

	lock_kernel();
	sbi->s_flags = uopt.flags;
	sbi->s_uid   = uopt.uid;
	sbi->s_gid   = uopt.gid;
	sbi->s_umask = uopt.umask;
	sbi->s_fmode = uopt.fmode;
	sbi->s_dmode = uopt.dmode;

	if (sbi->s_lvid_bh) {
		int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
		if (write_rev > UDF_MAX_WRITE_VERSION)
			*flags |= MS_RDONLY;
	}

	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		goto out_unlock;

	if (*flags & MS_RDONLY) {
		udf_close_lvid(sb);

		error = dquot_suspend(sb, -1);
	} else {
		udf_open_lvid(sb);

		/* mark the fs r/w for quota activity */
		sb->s_flags &= ~MS_RDONLY;
		dquot_resume(sb, -1);
	}

out_unlock:
	unlock_kernel();
	return error;
}

/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
static loff_t udf_check_vsd(struct super_block *sb)
{
	struct volStructDesc *vsd = NULL;
	loff_t sector = 32768;
	int sectorsize;
	struct buffer_head *bh = NULL;
	int nsr02 = 0;
	int nsr03 = 0;
	struct udf_sb_info *sbi;

	sbi = UDF_SB(sb);
	if (sb->s_blocksize < sizeof(struct volStructDesc))
		sectorsize = sizeof(struct volStructDesc);
	else
		sectorsize = sb->s_blocksize;

	sector += (sbi->s_session << sb->s_blocksize_bits);

	udf_debug("Starting at sector %u (%ld byte sectors)\n",
		  (unsigned int)(sector >> sb->s_blocksize_bits),
		  sb->s_blocksize);
	/* Process the sequence (if applicable) */
	for (; !nsr02 && !nsr03; sector += sectorsize) {
		/* Read a block */
		bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
		if (!bh)
			break;

		/* Look for ISO  descriptors */
		vsd = (struct volStructDesc *)(bh->b_data +
					      (sector & (sb->s_blocksize - 1)));

		if (vsd->stdIdent[0] == 0) {
			brelse(bh);
			break;
		} else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
				    VSD_STD_ID_LEN)) {
			switch (vsd->structType) {
			case 0:
				udf_debug("ISO9660 Boot Record found\n");
				break;
			case 1:
				udf_debug("ISO9660 Primary Volume Descriptor "
					  "found\n");
				break;
			case 2:
				udf_debug("ISO9660 Supplementary Volume "
					  "Descriptor found\n");
				break;
			case 3:
				udf_debug("ISO9660 Volume Partition Descriptor "
					  "found\n");
				break;
			case 255:
				udf_debug("ISO9660 Volume Descriptor Set "
					  "Terminator found\n");
				break;
			default:
				udf_debug("ISO9660 VRS (%u) found\n",
					  vsd->structType);
				break;
			}
		} else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
				    VSD_STD_ID_LEN))
			; /* nothing */
		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
				    VSD_STD_ID_LEN)) {
			brelse(bh);
			break;
		} else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
				    VSD_STD_ID_LEN))
			nsr02 = sector;
		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
				    VSD_STD_ID_LEN))
			nsr03 = sector;
		brelse(bh);
	}

	if (nsr03)
		return nsr03;
	else if (nsr02)
		return nsr02;
	else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
		return -1;
	else
		return 0;
}

static int udf_find_fileset(struct super_block *sb,
			    struct kernel_lb_addr *fileset,
			    struct kernel_lb_addr *root)
{
	struct buffer_head *bh = NULL;
	long lastblock;
	uint16_t ident;
	struct udf_sb_info *sbi;

	if (fileset->logicalBlockNum != 0xFFFFFFFF ||
	    fileset->partitionReferenceNum != 0xFFFF) {
		bh = udf_read_ptagged(sb, fileset, 0, &ident);

		if (!bh) {
			return 1;
		} else if (ident != TAG_IDENT_FSD) {
			brelse(bh);
			return 1;
		}

	}

	sbi = UDF_SB(sb);
	if (!bh) {
		/* Search backwards through the partitions */
		struct kernel_lb_addr newfileset;

/* --> cvg: FIXME - is it reasonable? */
		return 1;

		for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
		     (newfileset.partitionReferenceNum != 0xFFFF &&
		      fileset->logicalBlockNum == 0xFFFFFFFF &&
		      fileset->partitionReferenceNum == 0xFFFF);
		     newfileset.partitionReferenceNum--) {
			lastblock = sbi->s_partmaps
					[newfileset.partitionReferenceNum]
						.s_partition_len;
			newfileset.logicalBlockNum = 0;

			do {
				bh = udf_read_ptagged(sb, &newfileset, 0,
						      &ident);
				if (!bh) {
					newfileset.logicalBlockNum++;
					continue;
				}

				switch (ident) {
				case TAG_IDENT_SBD:
				{
					struct spaceBitmapDesc *sp;
					sp = (struct spaceBitmapDesc *)
								bh->b_data;
					newfileset.logicalBlockNum += 1 +
						((le32_to_cpu(sp->numOfBytes) +
						  sizeof(struct spaceBitmapDesc)
						  - 1) >> sb->s_blocksize_bits);
					brelse(bh);
					break;
				}
				case TAG_IDENT_FSD:
					*fileset = newfileset;
					break;
				default:
					newfileset.logicalBlockNum++;
					brelse(bh);
					bh = NULL;
					break;
				}
			} while (newfileset.logicalBlockNum < lastblock &&
				 fileset->logicalBlockNum == 0xFFFFFFFF &&
				 fileset->partitionReferenceNum == 0xFFFF);
		}
	}

	if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
	     fileset->partitionReferenceNum != 0xFFFF) && bh) {
		udf_debug("Fileset at block=%d, partition=%d\n",
			  fileset->logicalBlockNum,
			  fileset->partitionReferenceNum);

		sbi->s_partition = fileset->partitionReferenceNum;
		udf_load_fileset(sb, bh, root);
		brelse(bh);
		return 0;
	}
	return 1;
}

static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
{
	struct primaryVolDesc *pvoldesc;
	struct ustr *instr, *outstr;
	struct buffer_head *bh;
	uint16_t ident;
	int ret = 1;

	instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
	if (!instr)
		return 1;

	outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
	if (!outstr)
		goto out1;

	bh = udf_read_tagged(sb, block, block, &ident);
	if (!bh)
		goto out2;

	BUG_ON(ident != TAG_IDENT_PVD);

	pvoldesc = (struct primaryVolDesc *)bh->b_data;

	if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
			      pvoldesc->recordingDateAndTime)) {
#ifdef UDFFS_DEBUG
		struct timestamp *ts = &pvoldesc->recordingDateAndTime;
		udf_debug("recording time %04u/%02u/%02u"
			  " %02u:%02u (%x)\n",
			  le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
			  ts->minute, le16_to_cpu(ts->typeAndTimezone));
#endif
	}

	if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
		if (udf_CS0toUTF8(outstr, instr)) {
			strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
				outstr->u_len > 31 ? 31 : outstr->u_len);
			udf_debug("volIdent[] = '%s'\n",
					UDF_SB(sb)->s_volume_ident);
		}

	if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
		if (udf_CS0toUTF8(outstr, instr))
			udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);

	brelse(bh);
	ret = 0;
out2:
	kfree(outstr);
out1:
	kfree(instr);
	return ret;
}

static int udf_load_metadata_files(struct super_block *sb, int partition)
{
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct udf_part_map *map;
	struct udf_meta_data *mdata;
	struct kernel_lb_addr addr;
	int fe_error = 0;

	map = &sbi->s_partmaps[partition];
	mdata = &map->s_type_specific.s_metadata;

	/* metadata address */
	addr.logicalBlockNum =  mdata->s_meta_file_loc;
	addr.partitionReferenceNum = map->s_partition_num;

	udf_debug("Metadata file location: block = %d part = %d\n",
			  addr.logicalBlockNum, addr.partitionReferenceNum);

	mdata->s_metadata_fe = udf_iget(sb, &addr);

	if (mdata->s_metadata_fe == NULL) {
		udf_warning(sb, __func__, "metadata inode efe not found, "
				"will try mirror inode.");
		fe_error = 1;
	} else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
		 ICBTAG_FLAG_AD_SHORT) {
		udf_warning(sb, __func__, "metadata inode efe does not have "
			"short allocation descriptors!");
		fe_error = 1;
		iput(mdata->s_metadata_fe);
		mdata->s_metadata_fe = NULL;
	}

	/* mirror file entry */
	addr.logicalBlockNum = mdata->s_mirror_file_loc;
	addr.partitionReferenceNum = map->s_partition_num;

	udf_debug("Mirror metadata file location: block = %d part = %d\n",
			  addr.logicalBlockNum, addr.partitionReferenceNum);

	mdata->s_mirror_fe = udf_iget(sb, &addr);

	if (mdata->s_mirror_fe == NULL) {
		if (fe_error) {
			udf_error(sb, __func__, "mirror inode efe not found "
			"and metadata inode is missing too, exiting...");
			goto error_exit;
		} else
			udf_warning(sb, __func__, "mirror inode efe not found,"
					" but metadata inode is OK");
	} else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
		 ICBTAG_FLAG_AD_SHORT) {
		udf_warning(sb, __func__, "mirror inode efe does not have "
			"short allocation descriptors!");
		iput(mdata->s_mirror_fe);
		mdata->s_mirror_fe = NULL;
		if (fe_error)
			goto error_exit;
	}

	/*
	 * bitmap file entry
	 * Note:
	 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
	*/
	if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
		addr.logicalBlockNum = mdata->s_bitmap_file_loc;
		addr.partitionReferenceNum = map->s_partition_num;

		udf_debug("Bitmap file location: block = %d part = %d\n",
			addr.logicalBlockNum, addr.partitionReferenceNum);

		mdata->s_bitmap_fe = udf_iget(sb, &addr);

		if (mdata->s_bitmap_fe == NULL) {
			if (sb->s_flags & MS_RDONLY)
				udf_warning(sb, __func__, "bitmap inode efe "
					"not found but it's ok since the disc"
					" is mounted read-only");
			else {
				udf_error(sb, __func__, "bitmap inode efe not "
					"found and attempted read-write mount");
				goto error_exit;
			}
		}
	}

	udf_debug("udf_load_metadata_files Ok\n");

	return 0;

error_exit:
	return 1;
}

static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
			     struct kernel_lb_addr *root)
{
	struct fileSetDesc *fset;

	fset = (struct fileSetDesc *)bh->b_data;

	*root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);

	UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);

	udf_debug("Rootdir at block=%d, partition=%d\n",
		  root->logicalBlockNum, root->partitionReferenceNum);
}

int udf_compute_nr_groups(struct super_block *sb, u32 partition)
{
	struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
	return DIV_ROUND_UP(map->s_partition_len +
			    (sizeof(struct spaceBitmapDesc) << 3),
			    sb->s_blocksize * 8);
}

static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
{
	struct udf_bitmap *bitmap;
	int nr_groups;
	int size;

	nr_groups = udf_compute_nr_groups(sb, index);
	size = sizeof(struct udf_bitmap) +
		(sizeof(struct buffer_head *) * nr_groups);

	if (size <= PAGE_SIZE)
		bitmap = kmalloc(size, GFP_KERNEL);
	else
		bitmap = vmalloc(size); /* TODO: get rid of vmalloc */

	if (bitmap == NULL) {
		udf_error(sb, __func__,
			  "Unable to allocate space for bitmap "
			  "and %d buffer_head pointers", nr_groups);
		return NULL;
	}

	memset(bitmap, 0x00, size);
	bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
	bitmap->s_nr_groups = nr_groups;
	return bitmap;
}

static int udf_fill_partdesc_info(struct super_block *sb,
		struct partitionDesc *p, int p_index)
{
	struct udf_part_map *map;
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct partitionHeaderDesc *phd;

	map = &sbi->s_partmaps[p_index];

	map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
	map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);

	if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
		map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
	if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
		map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
	if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
		map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
	if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
		map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;

	udf_debug("Partition (%d type %x) starts at physical %d, "
		  "block length %d\n", p_index,
		  map->s_partition_type, map->s_partition_root,
		  map->s_partition_len);

	if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
	    strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
		return 0;

	phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
	if (phd->unallocSpaceTable.extLength) {
		struct kernel_lb_addr loc = {
			.logicalBlockNum = le32_to_cpu(
				phd->unallocSpaceTable.extPosition),
			.partitionReferenceNum = p_index,
		};

		map->s_uspace.s_table = udf_iget(sb, &loc);
		if (!map->s_uspace.s_table) {
			udf_debug("cannot load unallocSpaceTable (part %d)\n",
					p_index);
			return 1;
		}
		map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
		udf_debug("unallocSpaceTable (part %d) @ %ld\n",
				p_index, map->s_uspace.s_table->i_ino);
	}

	if (phd->unallocSpaceBitmap.extLength) {
		struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
		if (!bitmap)
			return 1;
		map->s_uspace.s_bitmap = bitmap;
		bitmap->s_extLength = le32_to_cpu(
				phd->unallocSpaceBitmap.extLength);
		bitmap->s_extPosition = le32_to_cpu(
				phd->unallocSpaceBitmap.extPosition);
		map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
		udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
						bitmap->s_extPosition);
	}

	if (phd->partitionIntegrityTable.extLength)
		udf_debug("partitionIntegrityTable (part %d)\n", p_index);

	if (phd->freedSpaceTable.extLength) {
		struct kernel_lb_addr loc = {
			.logicalBlockNum = le32_to_cpu(
				phd->freedSpaceTable.extPosition),
			.partitionReferenceNum = p_index,
		};

		map->s_fspace.s_table = udf_iget(sb, &loc);
		if (!map->s_fspace.s_table) {
			udf_debug("cannot load freedSpaceTable (part %d)\n",
				p_index);
			return 1;
		}

		map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
		udf_debug("freedSpaceTable (part %d) @ %ld\n",
				p_index, map->s_fspace.s_table->i_ino);
	}

	if (phd->freedSpaceBitmap.extLength) {
		struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
		if (!bitmap)
			return 1;
		map->s_fspace.s_bitmap = bitmap;
		bitmap->s_extLength = le32_to_cpu(
				phd->freedSpaceBitmap.extLength);
		bitmap->s_extPosition = le32_to_cpu(
				phd->freedSpaceBitmap.extPosition);
		map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
		udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
					bitmap->s_extPosition);
	}
	return 0;
}

static void udf_find_vat_block(struct super_block *sb, int p_index,
			       int type1_index, sector_t start_block)
{
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct udf_part_map *map = &sbi->s_partmaps[p_index];
	sector_t vat_block;
	struct kernel_lb_addr ino;

	/*
	 * VAT file entry is in the last recorded block. Some broken disks have
	 * it a few blocks before so try a bit harder...
	 */
	ino.partitionReferenceNum = type1_index;
	for (vat_block = start_block;
	     vat_block >= map->s_partition_root &&
	     vat_block >= start_block - 3 &&
	     !sbi->s_vat_inode; vat_block--) {
		ino.logicalBlockNum = vat_block - map->s_partition_root;
		sbi->s_vat_inode = udf_iget(sb, &ino);
	}
}

static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
{
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct udf_part_map *map = &sbi->s_partmaps[p_index];
	struct buffer_head *bh = NULL;
	struct udf_inode_info *vati;
	uint32_t pos;
	struct virtualAllocationTable20 *vat20;
	sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;

	udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
	if (!sbi->s_vat_inode &&
	    sbi->s_last_block != blocks - 1) {
		printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
		       " last recorded block (%lu), retrying with the last "
		       "block of the device (%lu).\n",
		       (unsigned long)sbi->s_last_block,
		       (unsigned long)blocks - 1);
		udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
	}
	if (!sbi->s_vat_inode)
		return 1;

	if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
		map->s_type_specific.s_virtual.s_start_offset = 0;
		map->s_type_specific.s_virtual.s_num_entries =
			(sbi->s_vat_inode->i_size - 36) >> 2;
	} else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
		vati = UDF_I(sbi->s_vat_inode);
		if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
			pos = udf_block_map(sbi->s_vat_inode, 0);
			bh = sb_bread(sb, pos);
			if (!bh)
				return 1;
			vat20 = (struct virtualAllocationTable20 *)bh->b_data;
		} else {
			vat20 = (struct virtualAllocationTable20 *)
							vati->i_ext.i_data;
		}

		map->s_type_specific.s_virtual.s_start_offset =
			le16_to_cpu(vat20->lengthHeader);
		map->s_type_specific.s_virtual.s_num_entries =
			(sbi->s_vat_inode->i_size -
				map->s_type_specific.s_virtual.
					s_start_offset) >> 2;
		brelse(bh);
	}
	return 0;
}

static int udf_load_partdesc(struct super_block *sb, sector_t block)
{
	struct buffer_head *bh;
	struct partitionDesc *p;
	struct udf_part_map *map;
	struct udf_sb_info *sbi = UDF_SB(sb);
	int i, type1_idx;
	uint16_t partitionNumber;
	uint16_t ident;
	int ret = 0;

	bh = udf_read_tagged(sb, block, block, &ident);
	if (!bh)
		return 1;
	if (ident != TAG_IDENT_PD)
		goto out_bh;

	p = (struct partitionDesc *)bh->b_data;
	partitionNumber = le16_to_cpu(p->partitionNumber);

	/* First scan for TYPE1, SPARABLE and METADATA partitions */
	for (i = 0; i < sbi->s_partitions; i++) {
		map = &sbi->s_partmaps[i];
		udf_debug("Searching map: (%d == %d)\n",
			  map->s_partition_num, partitionNumber);
		if (map->s_partition_num == partitionNumber &&
		    (map->s_partition_type == UDF_TYPE1_MAP15 ||
		     map->s_partition_type == UDF_SPARABLE_MAP15))
			break;
	}

	if (i >= sbi->s_partitions) {
		udf_debug("Partition (%d) not found in partition map\n",
			  partitionNumber);
		goto out_bh;
	}

	ret = udf_fill_partdesc_info(sb, p, i);

	/*
	 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
	 * PHYSICAL partitions are already set up
	 */
	type1_idx = i;
	for (i = 0; i < sbi->s_partitions; i++) {
		map = &sbi->s_partmaps[i];

		if (map->s_partition_num == partitionNumber &&
		    (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
		     map->s_partition_type == UDF_VIRTUAL_MAP20 ||
		     map->s_partition_type == UDF_METADATA_MAP25))
			break;
	}

	if (i >= sbi->s_partitions)
		goto out_bh;

	ret = udf_fill_partdesc_info(sb, p, i);
	if (ret)
		goto out_bh;

	if (map->s_partition_type == UDF_METADATA_MAP25) {
		ret = udf_load_metadata_files(sb, i);
		if (ret) {
			printk(KERN_ERR "UDF-fs: error loading MetaData "
			"partition map %d\n", i);
			goto out_bh;
		}
	} else {
		ret = udf_load_vat(sb, i, type1_idx);
		if (ret)
			goto out_bh;
		/*
		 * Mark filesystem read-only if we have a partition with
		 * virtual map since we don't handle writing to it (we
		 * overwrite blocks instead of relocating them).
		 */
		sb->s_flags |= MS_RDONLY;
		printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
			"because writing to pseudooverwrite partition is "
			"not implemented.\n");
	}
out_bh:
	/* In case loading failed, we handle cleanup in udf_fill_super */
	brelse(bh);
	return ret;
}

static int udf_load_logicalvol(struct super_block *sb, sector_t block,
			       struct kernel_lb_addr *fileset)
{
	struct logicalVolDesc *lvd;
	int i, j, offset;
	uint8_t type;
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct genericPartitionMap *gpm;
	uint16_t ident;
	struct buffer_head *bh;
	int ret = 0;

	bh = udf_read_tagged(sb, block, block, &ident);
	if (!bh)
		return 1;
	BUG_ON(ident != TAG_IDENT_LVD);
	lvd = (struct logicalVolDesc *)bh->b_data;

	i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
	if (i != 0) {
		ret = i;
		goto out_bh;
	}

	for (i = 0, offset = 0;
	     i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
	     i++, offset += gpm->partitionMapLength) {
		struct udf_part_map *map = &sbi->s_partmaps[i];
		gpm = (struct genericPartitionMap *)
				&(lvd->partitionMaps[offset]);
		type = gpm->partitionMapType;
		if (type == 1) {
			struct genericPartitionMap1 *gpm1 =
				(struct genericPartitionMap1 *)gpm;
			map->s_partition_type = UDF_TYPE1_MAP15;
			map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
			map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
			map->s_partition_func = NULL;
		} else if (type == 2) {
			struct udfPartitionMap2 *upm2 =
						(struct udfPartitionMap2 *)gpm;
			if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
						strlen(UDF_ID_VIRTUAL))) {
				u16 suf =
					le16_to_cpu(((__le16 *)upm2->partIdent.
							identSuffix)[0]);
				if (suf < 0x0200) {
					map->s_partition_type =
							UDF_VIRTUAL_MAP15;
					map->s_partition_func =
							udf_get_pblock_virt15;
				} else {
					map->s_partition_type =
							UDF_VIRTUAL_MAP20;
					map->s_partition_func =
							udf_get_pblock_virt20;
				}
			} else if (!strncmp(upm2->partIdent.ident,
						UDF_ID_SPARABLE,
						strlen(UDF_ID_SPARABLE))) {
				uint32_t loc;
				struct sparingTable *st;
				struct sparablePartitionMap *spm =
					(struct sparablePartitionMap *)gpm;

				map->s_partition_type = UDF_SPARABLE_MAP15;
				map->s_type_specific.s_sparing.s_packet_len =
						le16_to_cpu(spm->packetLength);
				for (j = 0; j < spm->numSparingTables; j++) {
					struct buffer_head *bh2;

					loc = le32_to_cpu(
						spm->locSparingTable[j]);
					bh2 = udf_read_tagged(sb, loc, loc,
							     &ident);
					map->s_type_specific.s_sparing.
							s_spar_map[j] = bh2;

					if (bh2 == NULL)
						continue;

					st = (struct sparingTable *)bh2->b_data;
					if (ident != 0 || strncmp(
						st->sparingIdent.ident,
						UDF_ID_SPARING,
						strlen(UDF_ID_SPARING))) {
						brelse(bh2);
						map->s_type_specific.s_sparing.
							s_spar_map[j] = NULL;
					}
				}
				map->s_partition_func = udf_get_pblock_spar15;
			} else if (!strncmp(upm2->partIdent.ident,
						UDF_ID_METADATA,
						strlen(UDF_ID_METADATA))) {
				struct udf_meta_data *mdata =
					&map->s_type_specific.s_metadata;
				struct metadataPartitionMap *mdm =
						(struct metadataPartitionMap *)
						&(lvd->partitionMaps[offset]);
				udf_debug("Parsing Logical vol part %d "
					"type %d  id=%s\n", i, type,
					UDF_ID_METADATA);

				map->s_partition_type = UDF_METADATA_MAP25;
				map->s_partition_func = udf_get_pblock_meta25;

				mdata->s_meta_file_loc   =
					le32_to_cpu(mdm->metadataFileLoc);
				mdata->s_mirror_file_loc =
					le32_to_cpu(mdm->metadataMirrorFileLoc);
				mdata->s_bitmap_file_loc =
					le32_to_cpu(mdm->metadataBitmapFileLoc);
				mdata->s_alloc_unit_size =
					le32_to_cpu(mdm->allocUnitSize);
				mdata->s_align_unit_size =
					le16_to_cpu(mdm->alignUnitSize);
				mdata->s_dup_md_flag 	 =
					mdm->flags & 0x01;

				udf_debug("Metadata Ident suffix=0x%x\n",
					(le16_to_cpu(
					 ((__le16 *)
					      mdm->partIdent.identSuffix)[0])));
				udf_debug("Metadata part num=%d\n",
					le16_to_cpu(mdm->partitionNum));
				udf_debug("Metadata part alloc unit size=%d\n",
					le32_to_cpu(mdm->allocUnitSize));
				udf_debug("Metadata file loc=%d\n",
					le32_to_cpu(mdm->metadataFileLoc));
				udf_debug("Mirror file loc=%d\n",
				       le32_to_cpu(mdm->metadataMirrorFileLoc));
				udf_debug("Bitmap file loc=%d\n",
				       le32_to_cpu(mdm->metadataBitmapFileLoc));
				udf_debug("Duplicate Flag: %d %d\n",
					mdata->s_dup_md_flag, mdm->flags);
			} else {
				udf_debug("Unknown ident: %s\n",
					  upm2->partIdent.ident);
				continue;
			}
			map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
			map->s_partition_num = le16_to_cpu(upm2->partitionNum);
		}
		udf_debug("Partition (%d:%d) type %d on volume %d\n",
			  i, map->s_partition_num, type,
			  map->s_volumeseqnum);
	}

	if (fileset) {
		struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);

		*fileset = lelb_to_cpu(la->extLocation);
		udf_debug("FileSet found in LogicalVolDesc at block=%d, "
			  "partition=%d\n", fileset->logicalBlockNum,
			  fileset->partitionReferenceNum);
	}
	if (lvd->integritySeqExt.extLength)
		udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));

out_bh:
	brelse(bh);
	return ret;
}

/*
 * udf_load_logicalvolint
 *
 */
static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
{
	struct buffer_head *bh = NULL;
	uint16_t ident;
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct logicalVolIntegrityDesc *lvid;

	while (loc.extLength > 0 &&
	       (bh = udf_read_tagged(sb, loc.extLocation,
				     loc.extLocation, &ident)) &&
	       ident == TAG_IDENT_LVID) {
		sbi->s_lvid_bh = bh;
		lvid = (struct logicalVolIntegrityDesc *)bh->b_data;

		if (lvid->nextIntegrityExt.extLength)
			udf_load_logicalvolint(sb,
				leea_to_cpu(lvid->nextIntegrityExt));

		if (sbi->s_lvid_bh != bh)
			brelse(bh);
		loc.extLength -= sb->s_blocksize;
		loc.extLocation++;
	}
	if (sbi->s_lvid_bh != bh)
		brelse(bh);
}

/*
 * udf_process_sequence
 *
 * PURPOSE
 *	Process a main/reserve volume descriptor sequence.
 *
 * PRE-CONDITIONS
 *	sb			Pointer to _locked_ superblock.
 *	block			First block of first extent of the sequence.
 *	lastblock		Lastblock of first extent of the sequence.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */
static noinline int udf_process_sequence(struct super_block *sb, long block,
				long lastblock, struct kernel_lb_addr *fileset)
{
	struct buffer_head *bh = NULL;
	struct udf_vds_record vds[VDS_POS_LENGTH];
	struct udf_vds_record *curr;
	struct generic_desc *gd;
	struct volDescPtr *vdp;
	int done = 0;
	uint32_t vdsn;
	uint16_t ident;
	long next_s = 0, next_e = 0;

	memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);

	/*
	 * Read the main descriptor sequence and find which descriptors
	 * are in it.
	 */
	for (; (!done && block <= lastblock); block++) {

		bh = udf_read_tagged(sb, block, block, &ident);
		if (!bh) {
			printk(KERN_ERR "udf: Block %Lu of volume descriptor "
			       "sequence is corrupted or we could not read "
			       "it.\n", (unsigned long long)block);
			return 1;
		}

		/* Process each descriptor (ISO 13346 3/8.3-8.4) */
		gd = (struct generic_desc *)bh->b_data;
		vdsn = le32_to_cpu(gd->volDescSeqNum);
		switch (ident) {
		case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
			curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
			if (vdsn >= curr->volDescSeqNum) {
				curr->volDescSeqNum = vdsn;
				curr->block = block;
			}
			break;
		case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
			curr = &vds[VDS_POS_VOL_DESC_PTR];
			if (vdsn >= curr->volDescSeqNum) {
				curr->volDescSeqNum = vdsn;
				curr->block = block;

				vdp = (struct volDescPtr *)bh->b_data;
				next_s = le32_to_cpu(
					vdp->nextVolDescSeqExt.extLocation);
				next_e = le32_to_cpu(
					vdp->nextVolDescSeqExt.extLength);
				next_e = next_e >> sb->s_blocksize_bits;
				next_e += next_s;
			}
			break;
		case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
			curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
			if (vdsn >= curr->volDescSeqNum) {
				curr->volDescSeqNum = vdsn;
				curr->block = block;
			}
			break;
		case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
			curr = &vds[VDS_POS_PARTITION_DESC];
			if (!curr->block)
				curr->block = block;
			break;
		case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
			curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
			if (vdsn >= curr->volDescSeqNum) {
				curr->volDescSeqNum = vdsn;
				curr->block = block;
			}
			break;
		case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
			curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
			if (vdsn >= curr->volDescSeqNum) {
				curr->volDescSeqNum = vdsn;
				curr->block = block;
			}
			break;
		case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
			vds[VDS_POS_TERMINATING_DESC].block = block;
			if (next_e) {
				block = next_s;
				lastblock = next_e;
				next_s = next_e = 0;
			} else
				done = 1;
			break;
		}
		brelse(bh);
	}
	/*
	 * Now read interesting descriptors again and process them
	 * in a suitable order
	 */
	if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
		printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
		return 1;
	}
	if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
		return 1;

	if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
	    vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
		return 1;

	if (vds[VDS_POS_PARTITION_DESC].block) {
		/*
		 * We rescan the whole descriptor sequence to find
		 * partition descriptor blocks and process them.
		 */
		for (block = vds[VDS_POS_PARTITION_DESC].block;
		     block < vds[VDS_POS_TERMINATING_DESC].block;
		     block++)
			if (udf_load_partdesc(sb, block))
				return 1;
	}

	return 0;
}

static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
			     struct kernel_lb_addr *fileset)
{
	struct anchorVolDescPtr *anchor;
	long main_s, main_e, reserve_s, reserve_e;
	struct udf_sb_info *sbi;

	sbi = UDF_SB(sb);
	anchor = (struct anchorVolDescPtr *)bh->b_data;

	/* Locate the main sequence */
	main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
	main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
	main_e = main_e >> sb->s_blocksize_bits;
	main_e += main_s;

	/* Locate the reserve sequence */
	reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
	reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
	reserve_e = reserve_e >> sb->s_blocksize_bits;
	reserve_e += reserve_s;

	/* Process the main & reserve sequences */
	/* responsible for finding the PartitionDesc(s) */
	if (!udf_process_sequence(sb, main_s, main_e, fileset))
		return 1;
	return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
}

/*
 * Check whether there is an anchor block in the given block and
 * load Volume Descriptor Sequence if so.
 */
static int udf_check_anchor_block(struct super_block *sb, sector_t block,
				  struct kernel_lb_addr *fileset)
{
	struct buffer_head *bh;
	uint16_t ident;
	int ret;

	if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
	    udf_fixed_to_variable(block) >=
	    sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
		return 0;

	bh = udf_read_tagged(sb, block, block, &ident);
	if (!bh)
		return 0;
	if (ident != TAG_IDENT_AVDP) {
		brelse(bh);
		return 0;
	}
	ret = udf_load_sequence(sb, bh, fileset);
	brelse(bh);
	return ret;
}

/* Search for an anchor volume descriptor pointer */
static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
				 struct kernel_lb_addr *fileset)
{
	sector_t last[6];
	int i;
	struct udf_sb_info *sbi = UDF_SB(sb);
	int last_count = 0;

	/* First try user provided anchor */
	if (sbi->s_anchor) {
		if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
			return lastblock;
	}
	/*
	 * according to spec, anchor is in either:
	 *     block 256
	 *     lastblock-256
	 *     lastblock
	 *  however, if the disc isn't closed, it could be 512.
	 */
	if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
		return lastblock;
	/*
	 * The trouble is which block is the last one. Drives often misreport
	 * this so we try various possibilities.
	 */
	last[last_count++] = lastblock;
	if (lastblock >= 1)
		last[last_count++] = lastblock - 1;
	last[last_count++] = lastblock + 1;
	if (lastblock >= 2)
		last[last_count++] = lastblock - 2;
	if (lastblock >= 150)
		last[last_count++] = lastblock - 150;
	if (lastblock >= 152)
		last[last_count++] = lastblock - 152;

	for (i = 0; i < last_count; i++) {
		if (last[i] >= sb->s_bdev->bd_inode->i_size >>
				sb->s_blocksize_bits)
			continue;
		if (udf_check_anchor_block(sb, last[i], fileset))
			return last[i];
		if (last[i] < 256)
			continue;
		if (udf_check_anchor_block(sb, last[i] - 256, fileset))
			return last[i];
	}

	/* Finally try block 512 in case media is open */
	if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
		return last[0];
	return 0;
}

/*
 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
 * area specified by it. The function expects sbi->s_lastblock to be the last
 * block on the media.
 *
 * Return 1 if ok, 0 if not found.
 *
 */
static int udf_find_anchor(struct super_block *sb,
			   struct kernel_lb_addr *fileset)
{
	sector_t lastblock;
	struct udf_sb_info *sbi = UDF_SB(sb);

	lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
	if (lastblock)
		goto out;

	/* No anchor found? Try VARCONV conversion of block numbers */
	UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
	/* Firstly, we try to not convert number of the last block */
	lastblock = udf_scan_anchors(sb,
				udf_variable_to_fixed(sbi->s_last_block),
				fileset);
	if (lastblock)
		goto out;

	/* Secondly, we try with converted number of the last block */
	lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
	if (!lastblock) {
		/* VARCONV didn't help. Clear it. */
		UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
		return 0;
	}
out:
	sbi->s_last_block = lastblock;
	return 1;
}

/*
 * Check Volume Structure Descriptor, find Anchor block and load Volume
 * Descriptor Sequence
 */
static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
			int silent, struct kernel_lb_addr *fileset)
{
	struct udf_sb_info *sbi = UDF_SB(sb);
	loff_t nsr_off;

	if (!sb_set_blocksize(sb, uopt->blocksize)) {
		if (!silent)
			printk(KERN_WARNING "UDF-fs: Bad block size\n");
		return 0;
	}
	sbi->s_last_block = uopt->lastblock;
	if (!uopt->novrs) {
		/* Check that it is NSR02 compliant */
		nsr_off = udf_check_vsd(sb);
		if (!nsr_off) {
			if (!silent)
				printk(KERN_WARNING "UDF-fs: No VRS found\n");
			return 0;
		}
		if (nsr_off == -1)
			udf_debug("Failed to read byte 32768. Assuming open "
				  "disc. Skipping validity check\n");
		if (!sbi->s_last_block)
			sbi->s_last_block = udf_get_last_block(sb);
	} else {
		udf_debug("Validity check skipped because of novrs option\n");
	}

	/* Look for anchor block and load Volume Descriptor Sequence */
	sbi->s_anchor = uopt->anchor;
	if (!udf_find_anchor(sb, fileset)) {
		if (!silent)
			printk(KERN_WARNING "UDF-fs: No anchor found\n");
		return 0;
	}
	return 1;
}

static void udf_open_lvid(struct super_block *sb)
{
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct buffer_head *bh = sbi->s_lvid_bh;
	struct logicalVolIntegrityDesc *lvid;
	struct logicalVolIntegrityDescImpUse *lvidiu;

	if (!bh)
		return;
	lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
	lvidiu = udf_sb_lvidiu(sbi);

	lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
	lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
	udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
				CURRENT_TIME);
	lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);

	lvid->descTag.descCRC = cpu_to_le16(
		crc_itu_t(0, (char *)lvid + sizeof(struct tag),
			le16_to_cpu(lvid->descTag.descCRCLength)));

	lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
	mark_buffer_dirty(bh);
	sbi->s_lvid_dirty = 0;
}

static void udf_close_lvid(struct super_block *sb)
{
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct buffer_head *bh = sbi->s_lvid_bh;
	struct logicalVolIntegrityDesc *lvid;
	struct logicalVolIntegrityDescImpUse *lvidiu;

	if (!bh)
		return;

	lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
	lvidiu = udf_sb_lvidiu(sbi);
	lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
	lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
	udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
	if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
		lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
	if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
		lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
	if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
		lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
	lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);

	lvid->descTag.descCRC = cpu_to_le16(
			crc_itu_t(0, (char *)lvid + sizeof(struct tag),
				le16_to_cpu(lvid->descTag.descCRCLength)));

	lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
	mark_buffer_dirty(bh);
	sbi->s_lvid_dirty = 0;
}

static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
{
	int i;
	int nr_groups = bitmap->s_nr_groups;
	int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
						nr_groups);

	for (i = 0; i < nr_groups; i++)
		if (bitmap->s_block_bitmap[i])
			brelse(bitmap->s_block_bitmap[i]);

	if (size <= PAGE_SIZE)
		kfree(bitmap);
	else
		vfree(bitmap);
}

static void udf_free_partition(struct udf_part_map *map)
{
	int i;
	struct udf_meta_data *mdata;

	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
		iput(map->s_uspace.s_table);
	if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
		iput(map->s_fspace.s_table);
	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
		udf_sb_free_bitmap(map->s_uspace.s_bitmap);
	if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
		udf_sb_free_bitmap(map->s_fspace.s_bitmap);
	if (map->s_partition_type == UDF_SPARABLE_MAP15)
		for (i = 0; i < 4; i++)
			brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
	else if (map->s_partition_type == UDF_METADATA_MAP25) {
		mdata = &map->s_type_specific.s_metadata;
		iput(mdata->s_metadata_fe);
		mdata->s_metadata_fe = NULL;

		iput(mdata->s_mirror_fe);
		mdata->s_mirror_fe = NULL;

		iput(mdata->s_bitmap_fe);
		mdata->s_bitmap_fe = NULL;
	}
}

static int udf_fill_super(struct super_block *sb, void *options, int silent)
{
	int i;
	int ret;
	struct inode *inode = NULL;
	struct udf_options uopt;
	struct kernel_lb_addr rootdir, fileset;
	struct udf_sb_info *sbi;

	uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
	uopt.uid = -1;
	uopt.gid = -1;
	uopt.umask = 0;
	uopt.fmode = UDF_INVALID_MODE;
	uopt.dmode = UDF_INVALID_MODE;

	sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	sb->s_fs_info = sbi;

	mutex_init(&sbi->s_alloc_mutex);

	if (!udf_parse_options((char *)options, &uopt, false))
		goto error_out;

	if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
	    uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
		udf_error(sb, "udf_read_super",
			  "utf8 cannot be combined with iocharset\n");
		goto error_out;
	}
#ifdef CONFIG_UDF_NLS
	if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
		uopt.nls_map = load_nls_default();
		if (!uopt.nls_map)
			uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
		else
			udf_debug("Using default NLS map\n");
	}
#endif
	if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
		uopt.flags |= (1 << UDF_FLAG_UTF8);

	fileset.logicalBlockNum = 0xFFFFFFFF;
	fileset.partitionReferenceNum = 0xFFFF;

	sbi->s_flags = uopt.flags;
	sbi->s_uid = uopt.uid;
	sbi->s_gid = uopt.gid;
	sbi->s_umask = uopt.umask;
	sbi->s_fmode = uopt.fmode;
	sbi->s_dmode = uopt.dmode;
	sbi->s_nls_map = uopt.nls_map;

	if (uopt.session == 0xFFFFFFFF)
		sbi->s_session = udf_get_last_session(sb);
	else
		sbi->s_session = uopt.session;

	udf_debug("Multi-session=%d\n", sbi->s_session);

	/* Fill in the rest of the superblock */
	sb->s_op = &udf_sb_ops;
	sb->s_export_op = &udf_export_ops;
#ifdef CONFIG_QUOTA
	sb->s_qcop = &dquot_quotactl_ops;
	sb->dq_op = NULL; /* &dquot_operations */
#endif

	sb->s_dirt = 0;
	sb->s_magic = UDF_SUPER_MAGIC;
	sb->s_time_gran = 1000;

	if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
		ret = udf_load_vrs(sb, &uopt, silent, &fileset);
	} else {
		uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
		ret = udf_load_vrs(sb, &uopt, silent, &fileset);
		if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
			if (!silent)
				printk(KERN_NOTICE
				       "UDF-fs: Rescanning with blocksize "
				       "%d\n", UDF_DEFAULT_BLOCKSIZE);
			uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
			ret = udf_load_vrs(sb, &uopt, silent, &fileset);
		}
	}
	if (!ret) {
		printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
		goto error_out;
	}

	udf_debug("Lastblock=%d\n", sbi->s_last_block);

	if (sbi->s_lvid_bh) {
		struct logicalVolIntegrityDescImpUse *lvidiu =
							udf_sb_lvidiu(sbi);
		uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
		uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
		/* uint16_t maxUDFWriteRev =
				le16_to_cpu(lvidiu->maxUDFWriteRev); */

		if (minUDFReadRev > UDF_MAX_READ_VERSION) {
			printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
					"(max is %x)\n",
			       le16_to_cpu(lvidiu->minUDFReadRev),
			       UDF_MAX_READ_VERSION);
			goto error_out;
		} else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
			sb->s_flags |= MS_RDONLY;

		sbi->s_udfrev = minUDFWriteRev;

		if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
			UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
		if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
			UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
	}

	if (!sbi->s_partitions) {
		printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
		goto error_out;
	}

	if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
			UDF_PART_FLAG_READ_ONLY) {
		printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
				   "forcing readonly mount\n");
		sb->s_flags |= MS_RDONLY;
	}

	if (udf_find_fileset(sb, &fileset, &rootdir)) {
		printk(KERN_WARNING "UDF-fs: No fileset found\n");
		goto error_out;
	}

	if (!silent) {
		struct timestamp ts;
		udf_time_to_disk_stamp(&ts, sbi->s_record_time);
		udf_info("UDF: Mounting volume '%s', "
			 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
			 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
			 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
	}
	if (!(sb->s_flags & MS_RDONLY))
		udf_open_lvid(sb);

	/* Assign the root inode */
	/* assign inodes by physical block number */
	/* perhaps it's not extensible enough, but for now ... */
	inode = udf_iget(sb, &rootdir);
	if (!inode) {
		printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
				"partition=%d\n",
		       rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
		goto error_out;
	}

	/* Allocate a dentry for the root inode */
	sb->s_root = d_alloc_root(inode);
	if (!sb->s_root) {
		printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
		iput(inode);
		goto error_out;
	}
	sb->s_maxbytes = MAX_LFS_FILESIZE;
	return 0;

error_out:
	if (sbi->s_vat_inode)
		iput(sbi->s_vat_inode);
	if (sbi->s_partitions)
		for (i = 0; i < sbi->s_partitions; i++)
			udf_free_partition(&sbi->s_partmaps[i]);
#ifdef CONFIG_UDF_NLS
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
		unload_nls(sbi->s_nls_map);
#endif
	if (!(sb->s_flags & MS_RDONLY))
		udf_close_lvid(sb);
	brelse(sbi->s_lvid_bh);

	kfree(sbi->s_partmaps);
	kfree(sbi);
	sb->s_fs_info = NULL;

	return -EINVAL;
}

static void udf_error(struct super_block *sb, const char *function,
		      const char *fmt, ...)
{
	va_list args;

	if (!(sb->s_flags & MS_RDONLY)) {
		/* mark sb error */
		sb->s_dirt = 1;
	}
	va_start(args, fmt);
	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
	va_end(args);
	printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
		sb->s_id, function, error_buf);
}

void udf_warning(struct super_block *sb, const char *function,
		 const char *fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
	va_end(args);
	printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
	       sb->s_id, function, error_buf);
}

static void udf_put_super(struct super_block *sb)
{
	int i;
	struct udf_sb_info *sbi;

	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

	sbi = UDF_SB(sb);

	lock_kernel();

	if (sbi->s_vat_inode)
		iput(sbi->s_vat_inode);
	if (sbi->s_partitions)
		for (i = 0; i < sbi->s_partitions; i++)
			udf_free_partition(&sbi->s_partmaps[i]);
#ifdef CONFIG_UDF_NLS
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
		unload_nls(sbi->s_nls_map);
#endif
	if (!(sb->s_flags & MS_RDONLY))
		udf_close_lvid(sb);
	brelse(sbi->s_lvid_bh);
	kfree(sbi->s_partmaps);
	kfree(sb->s_fs_info);
	sb->s_fs_info = NULL;

	unlock_kernel();
}

static int udf_sync_fs(struct super_block *sb, int wait)
{
	struct udf_sb_info *sbi = UDF_SB(sb);

	mutex_lock(&sbi->s_alloc_mutex);
	if (sbi->s_lvid_dirty) {
		/*
		 * Blockdevice will be synced later so we don't have to submit
		 * the buffer for IO
		 */
		mark_buffer_dirty(sbi->s_lvid_bh);
		sb->s_dirt = 0;
		sbi->s_lvid_dirty = 0;
	}
	mutex_unlock(&sbi->s_alloc_mutex);

	return 0;
}

static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct logicalVolIntegrityDescImpUse *lvidiu;
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	if (sbi->s_lvid_bh != NULL)
		lvidiu = udf_sb_lvidiu(sbi);
	else
		lvidiu = NULL;

	buf->f_type = UDF_SUPER_MAGIC;
	buf->f_bsize = sb->s_blocksize;
	buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
	buf->f_bfree = udf_count_free(sb);
	buf->f_bavail = buf->f_bfree;
	buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
					  le32_to_cpu(lvidiu->numDirs)) : 0)
			+ buf->f_bfree;
	buf->f_ffree = buf->f_bfree;
	buf->f_namelen = UDF_NAME_LEN - 2;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);

	return 0;
}

static unsigned int udf_count_free_bitmap(struct super_block *sb,
					  struct udf_bitmap *bitmap)
{
	struct buffer_head *bh = NULL;
	unsigned int accum = 0;
	int index;
	int block = 0, newblock;
	struct kernel_lb_addr loc;
	uint32_t bytes;
	uint8_t *ptr;
	uint16_t ident;
	struct spaceBitmapDesc *bm;

	lock_kernel();

	loc.logicalBlockNum = bitmap->s_extPosition;
	loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
	bh = udf_read_ptagged(sb, &loc, 0, &ident);

	if (!bh) {
		printk(KERN_ERR "udf: udf_count_free failed\n");
		goto out;
	} else if (ident != TAG_IDENT_SBD) {
		brelse(bh);
		printk(KERN_ERR "udf: udf_count_free failed\n");
		goto out;
	}

	bm = (struct spaceBitmapDesc *)bh->b_data;
	bytes = le32_to_cpu(bm->numOfBytes);
	index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
	ptr = (uint8_t *)bh->b_data;

	while (bytes > 0) {
		u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
		accum += bitmap_weight((const unsigned long *)(ptr + index),
					cur_bytes * 8);
		bytes -= cur_bytes;
		if (bytes) {
			brelse(bh);
			newblock = udf_get_lb_pblock(sb, &loc, ++block);
			bh = udf_tread(sb, newblock);
			if (!bh) {
				udf_debug("read failed\n");
				goto out;
			}
			index = 0;
			ptr = (uint8_t *)bh->b_data;
		}
	}
	brelse(bh);

out:
	unlock_kernel();

	return accum;
}

static unsigned int udf_count_free_table(struct super_block *sb,
					 struct inode *table)
{
	unsigned int accum = 0;
	uint32_t elen;
	struct kernel_lb_addr eloc;
	int8_t etype;
	struct extent_position epos;

	lock_kernel();

	epos.block = UDF_I(table)->i_location;
	epos.offset = sizeof(struct unallocSpaceEntry);
	epos.bh = NULL;

	while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
		accum += (elen >> table->i_sb->s_blocksize_bits);

	brelse(epos.bh);

	unlock_kernel();

	return accum;
}

static unsigned int udf_count_free(struct super_block *sb)
{
	unsigned int accum = 0;
	struct udf_sb_info *sbi;
	struct udf_part_map *map;

	sbi = UDF_SB(sb);
	if (sbi->s_lvid_bh) {
		struct logicalVolIntegrityDesc *lvid =
			(struct logicalVolIntegrityDesc *)
			sbi->s_lvid_bh->b_data;
		if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
			accum = le32_to_cpu(
					lvid->freeSpaceTable[sbi->s_partition]);
			if (accum == 0xFFFFFFFF)
				accum = 0;
		}
	}

	if (accum)
		return accum;

	map = &sbi->s_partmaps[sbi->s_partition];
	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
		accum += udf_count_free_bitmap(sb,
					       map->s_uspace.s_bitmap);
	}
	if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
		accum += udf_count_free_bitmap(sb,
					       map->s_fspace.s_bitmap);
	}
	if (accum)
		return accum;

	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
		accum += udf_count_free_table(sb,
					      map->s_uspace.s_table);
	}
	if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
		accum += udf_count_free_table(sb,
					      map->s_fspace.s_table);
	}

	return accum;
}